Optical system and imaging device module

Abstract

An optical system disclosed in one embodiment of the present invention includes first to seventh lenses aligned along an optical axis from an object side toward a sensor side, in which a refractive power of the first lens is negative, a combined refractive power of the second to seventh lenses is positive, and a refractive power of the seventh lens is negative, the first lens is a spherical lens having a maximum center thickness, and the center thickness of the first lens may be greater than an optical axis distance from a center of an object-side surface of the fifth lens to a center of a sensor-side surface of the sixth lens.

Description

Technical Field

[0001] Embodiments of the present invention relate to an optical system for improved optical performance and a camera module including the optical system. Background Art

[0002] ADAS (Advanced Driver Assistance System) is an advanced driver assistance system for assisting the driver in driving, and includes sensing the situation ahead, determining the situation based on the sensing result, and determining the behavior of controlling the vehicle based on the situation. For example, an ADAS sensor device detects the vehicle ahead and identifies the lane. Afterwards, when the target lane or target speed and the target ahead are determined, the vehicle's ESC (Electronic Stability Control), EMS (Engine Management System), MDPS (Motor Power Steering), etc. are controlled. Generally, ADAS can be implemented as an automatic parking system, a low-speed city driving assistance system, a blind spot warning system, etc. The sensor devices used to sense the situation ahead in ADAS are GPS sensors, laser scanners, front radars, and lidars, and the most representative sensor devices are cameras for photographing the front, rear, and sides of the vehicle.

[0003] These cameras can be placed outside or inside the vehicle to detect the surrounding environment of the vehicle. In addition, the camera can be placed inside the vehicle to detect the conditions of the driver and passengers. For example, the camera can take a picture of the driver at a position close to the driver and detect the driver's health condition, whether he or she is drowsy, whether he or she is drinking, etc. In addition, the camera can take a picture of the passenger at a position close to the passenger and detect the passenger's sleeping condition, health condition, etc., and provide the driver with information about the passenger.

[0004] In particular, the most important element for obtaining an image from a camera is an imaging lens that forms the image. Recently, there has been an increasing interest in high definition and high resolution, and an optical system including a plurality of lenses is being studied to achieve this. However, there is a problem in that when the camera is exposed to a harsh environment such as high temperature, low temperature, moisture or high humidity outside or inside a vehicle, the characteristics of the optical system change. In this case, the camera has a problem in that it is difficult to uniformly obtain excellent optical characteristics and aberration characteristics. Therefore, a new optical system and camera that can solve the above problems are needed. Summary of the invention

[0005] [Technical issues]

[0006] Embodiments of the present invention provide an optical system and an imaging device module with improved optical characteristics. Embodiments of the present invention provide an optical system and an imaging device module having excellent optical performance from a low-temperature environment to a high-temperature environment. Embodiments of the present invention provide an optical system and an imaging device module capable of preventing changes in optical characteristics within various temperature ranges or minimizing changes in optical characteristics within various temperature ranges.

[0007] [Technical Solution]

[0008] The optical system according to an embodiment of the present invention includes a first lens to a seventh lens aligned along an optical axis from an object side toward a sensor side, wherein the refractive power of the first lens is negative, the combined refractive power of the second lens to the seventh lens is positive, the refractive power of the seventh lens is negative, the first lens is a spherical lens having a maximum center thickness, and the center thickness of the first lens may be greater than the optical axis distance from the center of the object-side surface of the fifth lens to the center of the sensor-side surface of the sixth lens.

[0009] According to an embodiment of the present invention, the object-side surface of the fourth lens may have a concave shape on the optical axis. The center thickness of the second lens may be the smallest among the center thicknesses of the first lens to the seventh lens.

[0010] According to an embodiment of the present invention, the center distance between the i-th lens and the (i + 1)-th lens starting from the object side is CGi, and the center thickness of the i-th lens is CTi, and the value of the formula CTi / CGi may be the largest when i is 1. The value of the formula CTi / CGi may be the smallest when i is 3.

[0011] According to an embodiment of the present invention, the effective diameter of the first lens is CA1, the effective diameter of the second lens is CA2, and the effective diameter of the third lens is CA3, and the following formula may be satisfied: CA1 < CA2 < CA3. According to an embodiment of the present invention, the length from the center of the image sensor to the diagonal end is ImgH, the effective diameter of the fifth lens is CA5, the effective diameter of the sixth lens is CA6, and the effective diameter of the seventh lens is CA7, and the following formula may be satisfied: CA4 > CA5 > CA6 > (2 * ImgH) > CA7.

[0012] According to an embodiment of the present invention, the sensor-side surface of the fifth lens and the object-side surface of the sixth lens may be bonded to each other. An aperture stop may be included and arranged on the periphery between the first lens and the second lens.

[0013] According to an embodiment of the present invention, the object side surface and the sensor side surface of the third lens may be aspherical on the optical axis, and the object side surface and the sensor side surface of the seventh lens may be aspherical on the optical axis. The first to seventh lenses may be made of glass, and the number of lenses whose object side surfaces and the sensor side surfaces are spherical on the optical axis may be at least twice the number of lenses whose object side surfaces and the sensor side surfaces are aspherical.

[0014] According to an embodiment of the present invention, the center thickness of the first lens is CT1, the optical axis distance from the center of the object side surface of the first lens to the surface of the image sensor is TTL, and the following formula can be satisfied: 0.18≤CT1 / TTL≤0.3. According to an embodiment of the present invention, the center thickness of the first lens can be thicker than the center thickness of the cemented lens.

[0015] A camera module according to an embodiment of the present invention includes: an image sensor; a first lens to a seventh lens aligned along an optical axis from an object side toward a sensor side; an aperture stop arranged between spherical lenses among the first lens to the seventh lens; and an optical filter between the seventh lens and the image sensor, wherein the first lens has a meniscus shape convex toward the sensor on the optical axis, the first lens and the seventh lens have negative refractive power, and the composite refractive power of the second lens to the seventh lens is positive, and any one of the first lens to the fourth lens is an aspherical lens, and the aspherical lens can be arranged between lenses having a shape with both sides convex on the optical axis.

[0016] According to an embodiment of the present invention, a cemented lens is included in which two lenses having opposite refractive powers among the fifth to seventh lenses are cemented, and the cemented lens may include an object side lens convex on the optical axis and a sensor side lens concave on the optical axis.

[0017] [Beneficial Effects]

[0018] The optical system and the camera module according to the present embodiment may have improved optical characteristics. Specifically, in the optical system according to the present embodiment, a plurality of lenses may have set thicknesses, refractive powers, and distances between adjacent lenses. Therefore, the optical system and the camera module according to the present embodiment may have improved MTF characteristics, aberration control characteristics, resolution characteristics, etc. within a set field of view, and may have good optical performance in the periphery of the field of view.

[0019] In addition, the optical system and the camera module according to the present embodiment can have good optical performance in a temperature range from low temperature (about -20°C to -40°C) to high temperature (85°C to 105°C). Specifically, the multiple lenses included in the optical system can have set materials, refractive powers, and refractive indices. Therefore, even when the focal length of each lens changes due to changes in the refractive index according to temperature changes, the lenses can compensate each other. That is, the optical system can effectively perform the distribution of refractive power in a temperature range from low temperature to high temperature, and prevent or minimize changes in optical characteristics in a temperature range from low temperature to high temperature. Therefore, the optical system and the camera module according to the present embodiment can maintain improved optical characteristics in various temperature ranges.

[0020] In addition, the optical system and camera module according to the present embodiment can meet the set field of view and achieve excellent optical characteristics by mixing aspherical lenses and spherical lenses. Therefore, the optical system can provide a thinner vehicle camera module. Therefore, the optical system and camera module can be provided for various applications and equipment, and can have excellent optical characteristics even in harsh temperature environments, such as when exposed to the outside or inside of the vehicle at high temperatures in summer. The present invention can improve the reliability of the optical system and camera module for ADAS placed in the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a side cross-sectional view of an optical system and a camera module having the same according to an embodiment.

[0022] Figure 2 It is used to explain the Figure 1 A side cross-sectional view showing the relationship between the nth lens and the n-1th lens.

[0023] Figure 3 It is shown Figure 1 A table of lens characteristics of an optical system.

[0024] Figure 4 It is shown Figure 1 Table of aspheric coefficients of lenses in the optical system.

[0025] Figure 5 It is shown Figure 1 A table of the thickness of each lens in an optical system and the distances between adjacent lenses.

[0026] Figure 6 It shows that according to Figure 1 A table of CRA (chief ray angle) data at room temperature, low temperature, and high temperature for the position of the image sensor in the optical system.

[0027] Figure 7 Is to show about Figure 1 A graph of the diffraction MTF (Modulation Transfer Function) data of an optical system at room temperature.

[0028] Figure 8 Is to show about Figure 1 A graph of the diffraction MTF data of an optical system at low temperatures.

[0029] Fig. 9 Is to show about Figure 1 A graph of the diffraction MTF data of an optical system at high temperature.

[0030] Fig.10 Is to show about Figure 1 A graph of data of aberration characteristics of an optical system at room temperature.

[0031] Fig.11 Is to show about Figure 1 A graph showing the aberration characteristics of an optical system at low temperatures.

[0032] Fig.12 Is to show about Figure 1 A graph showing data on aberration characteristics of an optical system at high temperatures.

[0033] Fig.13 is a graph showing relative illuminance according to the height of the image sensor according to the first embodiment.

[0034] Fig.14 is a side cross-sectional view of an optical system and an image pickup device module having the optical system according to a second embodiment.

[0035] Fig.15 It is used to explain the Fig.14 A side cross-sectional view showing the relationship between the nth lens and the n-1th lens.

[0036] Fig.16 It is shown Fig.14 A table of lens characteristics of an optical system.

[0037] Fig.17 It is shown Fig.14 Table of aspheric coefficients of lenses in the optical system.

[0038] Fig.18 It is shown Fig.14 A table of the thickness of each lens in an optical system and the spacing between adjacent lenses.

[0039] Fig.19 It shows that according to Fig.14 Table of CRA data at room temperature, low temperature, and high temperature for the location of the image sensor in the optical system.

[0040] Fig. 20 Is to show about Fig.14 A graph of the diffraction MTF data of an optical system at room temperature.

[0041] Fig.21 Is to show about Fig.14 A graph of the diffraction MTF data of an optical system at low temperatures.

[0042] Fig. 22 Is to show about Fig.14 A graph of the diffraction MTF data of an optical system at high temperature.

[0043] Fig.23 Is to show about Fig.14 A graph of data of aberration characteristics of an optical system at room temperature.

[0044] Fig.24 Is to show about Fig.14 A graph showing the aberration characteristics of an optical system at low temperatures.

[0045] Fig.25 Is to show about Fig.14 A graph showing data on aberration characteristics of an optical system at high temperatures.

[0046] Fig.26 is a side cross-sectional view of an optical system according to a third embodiment and an image pickup device module having the optical system.

[0047] Fig. 27 It is shown Fig.26 A table of lens characteristics of an optical system.

[0048] Fig.28 It is shown Fig.26 Table of aspheric coefficients of lenses in the optical system.

[0049] Fig.29 It is shown Fig.26 A table of the thickness of each lens in an optical system and the spacing between adjacent lenses.

[0050] Fig.30 It shows that according to Fig.26 Table of CRA data at room temperature, low temperature, and high temperature for the location of the image sensor in the optical system.

[0051] Fig.31 Is to show about Fig.26 A graph of the diffraction MTF data of an optical system at room temperature.

[0052] Fig.32 Is to show about Fig.26A graph of the aberration characteristics data of the optical system at room temperature.

[0053] Fig.33 : is a table showing data on relative illuminance according to the height of the image sensor according to the second and third embodiments.

[0054] Fig.34 is a side cross-sectional view of an optical system according to a fourth embodiment and an image pickup device module having the optical system.

[0055] Fig.35 It is used to explain the Fig.34 A side cross-sectional view showing the relationship between the nth lens and the n-1th lens.

[0056] Fig.36 It is shown Fig.34 A table of lens characteristics of an optical system.

[0057] Fig.37 It is shown Fig.34 Table of aspheric coefficients of lenses in the optical system.

[0058] Fig.38 It is shown Fig.34 A table of the thickness of each lens in an optical system and the spacing between adjacent lenses.

[0059] Fig.39 It shows that according to Fig.34 Table of CRA data at room temperature, low temperature, and high temperature for the location of the image sensor in the optical system.

[0060] Fig.40 Is to show about Fig.34 A graph of the diffraction MTF data of an optical system at room temperature.

[0061] Fig.41 Is to show about Fig.34 A graph of the diffraction MTF data of an optical system at low temperatures.

[0062] Fig.42 Is to show about Fig.34 A graph of the diffraction MTF data of an optical system at high temperature.

[0063] Fig.43 Is to show about Fig.34 A graph of data of aberration characteristics of an optical system at room temperature.

[0064] Fig.44 Is to show about Fig.34 A graph showing the aberration characteristics of an optical system at low temperatures.

[0065] Fig.45 Is to show about Fig.34 A graph showing data on aberration characteristics of an optical system at high temperatures.

[0066] Fig.46 is a side cross-sectional view of an optical system according to a fifth embodiment and an image pickup device module having the optical system.

[0067] Fig.47 It is shown Fig.46 A table of lens characteristics of an optical system.

[0068] Fig.48 It is shown Fig.46 Table of aspheric coefficients of lenses in the optical system.

[0069] Fig.49 It is shown Fig.46 A table of the thickness of each lens in an optical system and the spacing between adjacent lenses.

[0070] Fig.50 It shows that according to Fig.46 Table of CRA data at room temperature, low temperature, and high temperature for the location of the image sensor in the optical system.

[0071] Fig.51 Is to show about Fig.46 A graph of the diffraction MTF data of an optical system at room temperature.

[0072] Fig.52 Is to show about Fig.46 A graph of the aberration characteristics data of the optical system at room temperature.

[0073] Fig.53 : is a table showing data on relative illuminance according to the height of the image sensor according to the fourth and fifth embodiments.

[0074] Fig.54 is an example of a vehicle having an optical system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0075] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The technical spirit of the present invention is not limited to some embodiments to be described, but can be implemented in various other forms, and within the scope of the technical spirit of the present invention, one or more of the components can be selectively combined and replaced for use. In addition, unless explicitly defined and clearly described, the terms (including technical terms and scientific terms) used in the embodiments of the present invention can be interpreted with the meaning that can be generally understood by ordinary technicians in the field to which the present invention belongs, and commonly used terms such as terms defined in dictionaries should be able to interpret their meanings in consideration of the contextual meaning of the relevant technology.

[0076] The terms used in the embodiments of the present invention are used to illustrate the embodiments, and are not intended to limit the present invention. In this specification, unless otherwise specifically stated in the phrase, the singular form may also include the plural form, and in the case of describing A and (and) at least one (or one or more) of B, C, it may include one or more of all combinations that can be combined with A, B and C. When describing the components of the embodiments of the present invention, terms such as the first, second, A, B, (a) and (b) may be used. Such terms are only used to distinguish components from other components, and may not be determined by the term by the properties, sequence or process of the corresponding constituent elements. And when describing a component "connected", "coupled" or "engaged" to another component, the description may include not only direct connection, coupling or engagement to another component, but also "connection", "coupling" or "engagement" between the component and another component. In addition, in the case of being described as being formed or arranged on "above (upper)" or "below (lower)" of each component, the description may include not only the situation that the two components are in direct contact with each other, but also the situation that one or more other components are formed or arranged between the two components. In addition, when expressed as "above (up)" or "below (lower)", it can refer to the downward direction as well as the upward direction relative to an element. Several embodiments described below can be combined with each other unless it is specifically stated that they cannot be combined with each other. In addition, unless otherwise specified, the description of other embodiments can be applied to the parts omitted in the description of any one of the several embodiments.

[0077] In the description of the present invention, "object side surface" may refer to the surface of the lens facing the object side relative to the optical axis OA, and "sensor side surface" may refer to the surface of the lens facing the imaging surface (image sensor) relative to the optical axis. The convex surface of the lens may mean a convex shape on the optical axis or the paraxial region, and the concave surface of the lens may mean a concave shape on the optical axis or the paraxial region. The radius of curvature, the center thickness, and the distance between the lenses described in the table of lens data may mean the value on the optical axis, and the unit is mm. The vertical direction may mean the direction perpendicular to the optical axis, and the end of the lens or the lens surface may mean the end or edge of the effective area of ​​the lens through which the incident light passes. Depending on the measurement method, the size of the effective diameter on the lens surface may have a measurement error of up to ±0.4mm. The paraxial region refers to a very narrow area near the optical axis, and is an area where the distance of the light falling from the optical axis OA is almost 0. In the following, the optical axis may include the center of each lens or a very narrow area near the optical axis.

[0078] like Figure 1 , Fig.14 , Fig.26 , Fig.34 and Fig.46 As shown, the optical system 1000 according to an embodiment of the present invention may include a plurality of lens groups LG1 and LG2. Specifically, each of the plurality of lens groups LG1 and LG2 includes at least one lens. For example, the optical system 1000 may include a first lens group LG1 and a second lens group LG2 sequentially arranged along the optical axis OA from the object side toward the image sensor 300. The number of lenses of each of the first lens group LG1 and the second lens group LG2 may be different from each other. The number of lenses of the second lens group LG2 may be greater than the number of lenses of the first lens group LG1, and, for example, may be more than four times or more than five times the number of lenses of the first lens group LG1. The lenses of the first lens group LG1 and the second lens group LG2 may be defined as lens portions 100, 100A, 100B, 100C, and 100D.

[0079] The first lens group LG1 may include at least one lens. The first lens group LG1 may have two or less lenses. The first lens group LG1 may preferably be one lens. The second lens group LG2 may include two or more lenses. The second lens group LG2 may have five or more lenses, and preferably six lenses. The optical system 1000 may include n lenses, the nth lens may be the last lens, and the n-1th lens may be the lens closest to the last lens. n is an integer greater than or equal to 5, for example, 5 to 8.

[0080] The first lens group LG1 may include at least one glass lens. The first lens group LG1 may provide the lens closest to the object side as a glass lens. Such a glass material has a small amount of expansion and contraction change due to external temperature changes, and its surface is not easily scratched, thereby preventing surface damage. The lens material of the second lens group LG2 may include a glass lens. The second lens group LG2 may include five or more glass lenses, for example, five to seven glass lenses. The lenses of the first lens group LG1 and the second lens group LG2 may all be made of glass, and the glass lenses have a smaller amount of expansion and contraction due to temperature changes than plastic lenses, and degradation of optical characteristics can be prevented by thermal compensation. As another example, one or two lenses in the second lens group LG2 closest to the image sensor 300 may be set as plastic lenses or as aspherical lenses.

[0081] The lenses of the first lens group LG1 may be spherical lenses. The lenses of the second lens group LG2 may include at least one aspherical lens and two or more spherical lenses. An aspherical lens is a lens whose object side surface and sensor side surface are aspherical, while a spherical lens is a lens whose object side surface and sensor side surface are spherical. The number of spherical lenses in the second lens group LG2 may be at least twice the number of aspherical lenses. Aspherical lenses can prevent spherical aberration within the optical system 1000, and since aberration does not occur even when the effective diameter increases, miniaturization and lightweighting of the camera module may be feasible. The aspherical lenses may be made of glass molded material. The lenses of the second lens group LG2 may include at least one non-molded lens and at least one molded lens. For example, the number of non-molded lenses made of glass in the second lens group LG2 may be at least twice the number of molded lenses made of glass. The materials of the non-molded lens and the molded lens may both be glass, and the non-molded lens is a lens finely processed without injection molding, while the molded lens is an injection-molded lens.

[0082] The optical system 1000 is provided with a lens made of glass, and since the rate of change of contraction and expansion of the lens made of glass due to temperature change is smaller than that of the plastic material, thermal compensation can be performed in the lens barrel, and degradation of optical characteristics due to temperature change can be suppressed. In addition, since the lens made of glass includes at least two or more aspherical lenses, the occurrence of various aberrations can be suppressed.

[0083] Among the lenses of the optical system 1000, a lens having a maximum Abbe number may be positioned in the second lens group LG2, and a lens having a maximum refractive index may be positioned in the first lens group LG1 or the second lens group LG2. In the first to fifth embodiments, the maximum Abbe number may be 55 or more, and the maximum refractive index may be 1.70 or more. The lens having the maximum Abbe number may reduce dispersion, while the lens having the maximum refractive index may increase dispersion of incident light. Preferably, in the fourth and fifth embodiments, the maximum Abbe number may be 65 or more.

[0084] like Figure 1 As shown, the lens having the largest effective diameter in the lens portion 100 may be a lens on the sensor side of the aspherical lens positioned closest to the object side. Here, when there are two or more aspherical lenses, the object side aspherical lens may be positioned on the object side, and another aspherical lens may be positioned closest to the sensor side. Fig.14 and Fig.26 As shown, the lens having the largest effective diameter in the lens parts 100A and 100B may be the aspherical lens closest to the object side. Here, when there are two or more aspherical lenses, one may be positioned on the object side and the other may be positioned on the sensor side. Fig.34 and Fig.46 As shown, the lens having the largest effective diameter in the lens sections 100C and 100D may be positioned on the sensor side or the object side of the aspherical lens, for example, may be a lens positioned closer to the sensor side than the aspherical lens. Here, when there are two aspherical lenses, one may be a first aspherical lens positioned on the object side, and the other may be a second aspherical lens positioned on the sensor side.

[0085] In the optical system 1000, the lens having the maximum effective diameter may be a glass lens, such as a spherical lens made of glass. The effective diameter of each lens may be the diameter of the effective area where the effective light is incident on each lens, and is the average of the effective diameter on the object side surface and the effective diameter on the sensor side surface. According to an embodiment of the present invention, by further mixing an aspherical lens into the optical system 1000, the weight of the imaging device module can be reduced, the manufacturing cost can be provided more inexpensively, and the deterioration of the optical characteristics due to temperature changes can be suppressed. Each of the lenses may include an effective area and an ineffective area. The effective area may be the area through which the light incident on each lens in the lens passes. That is, the effective area may be defined as the effective area or effective diameter where the incident light is refracted to achieve the optical characteristics. The ineffective area may be arranged around the effective area. The ineffective area may be the area where the effective light is not incident on the plurality of lenses. That is, the non-effective area may be an area irrelevant to the optical characteristics. In addition, the end of the non-effective area may be the area fixed to the lens barrel (not shown) that houses the lens.

[0086] In the optical system 1000, the TTL (Total Top Length) may be greater than 4 times ImgH, for example, greater than 4 times and less than 15 times. Preferably, the following condition may be satisfied: 4 < TTL / ImgH < 10. The TTL (Total Trace Length) is the distance from the center of the object side surface of the first lens to the surface of the image sensor 300 on the optical axis OA. ImgH is the distance from the optical axis OA to the diagonal end of the image sensor 300, or 1 / 2 of the maximum diagonal length of the image sensor 300. In the optical system 1000, the EFL is set to 10 mm or greater, and the diagonal field of view (FOV) is set to be less than 45 degrees, so that it can be set as a standard optical system in the vehicle imaging device module. For example, the optical system and the imaging device module according to the embodiment may be applied to the imaging device module of the ADAS (Advanced Driving Assistance System) installed inside or outside the vehicle.

[0087] The optical system 1000 may satisfy the following formula: 2 < TTL / (2*ImgH), for example, 2 < TTL / (2*ImgH) < 7.5 or 2 < TTL / (2*ImgH) < 5. The optical system 1000 can provide a vehicle lens optical system by setting the value of TTL / (2*ImgH) to be greater than 2. The total number of lenses in the first lens group LG1 and the second lens group LG2 is 8 or less. Therefore, the optical system 1000 can provide an image without exaggeration or distortion for the image being formed.

[0088] The length of the image sensor 300 is the maximum length of the diagonal line in the direction orthogonal to the optical axis OA. The number of lenses in the optical system 1000 whose effective diameter is greater than the length of the image sensor 300 is greater than 70%, and the number of lenses whose effective diameter is less than the length of the image sensor 300 is 30% or less, for example, in the range of 10% to 30%. The effective diameter of at least one of the aspherical lenses on the optical system 1000 may be less than the length of the image sensor 300, and the effective diameter of at least one of the aspherical lenses may be greater than the length of the image sensor 300. The effective diameter of the lens closest to the object side among the lens parts 100, 100A, 100B, 100C, and 100D may be greater than the effective diameter of the lens closest to the image sensor 300. Therefore, the brightness of the optical system can be controlled. By controlling the size of the effective diameter of each lens in the lens, the optical system 1000 can control the incident light to compensate for the degradation of the optical characteristics due to the resolution and temperature changes, improve the chromatic aberration control characteristics, and improve the vignetting characteristics of the optical system 1000.

[0089] like Figure 1 , Fig.14 , Fig.26 , Fig.34 and Fig.46 As shown, the optical system 1000 or the lens parts 100, 100A, 100B, 100C and 100D may include at least one cemented lens CL1 to CL5. The above-mentioned cemented lenses CL1 to CL5 may be lenses in which two lenses having different focal lengths are bonded. The effective diameters of the object side surface and the sensor side surface of the cemented lenses CL1 to CL5 may be greater than the length of the image sensor 300. The effective diameter of the lens positioned on the sensor side relative to the cemented lenses CL1 to CL5 may be smaller than the length of the image sensor 300. In addition, the effective diameter of the lens positioned on the object side relative to the cemented lenses CL1 to CL5 may be greater than the length of the image sensor 300. The sensor side surface of the cemented lenses CL1 to CL5 may be positioned within a range of 100% to 110% of the length of the image sensor 300. The object side surface and the sensor side surface of the cemented lens CL1 may be spherical.

[0090] The optical system 1000 according to an embodiment may include an aperture stop ST. The aperture stop ST may control the amount of light incident on the optical system 1000. The aperture stop ST may be disposed between any two of the lens portions 100 and 100A to 100D. Among the lenses disposed between the object and the aperture stop ST, the effective diameter of the lens surface tends to become smaller as it moves from the object side to the aperture stop ST. Among the lenses disposed between the aperture stop ST and the image sensor 300, the effective diameter of the lens surface tends to become larger or smaller as it moves from the aperture stop ST to the sensor side. The meaning of "the effective diameter of the lens tends to become larger or smaller as it moves from the aperture stop ST to the sensor side" may include the lenses disposed between the aperture stop ST and the image sensor 300, where the effective diameter of the lens surface becomes larger or smaller as it moves from the aperture stop ST to the sensor side. Among the lenses disposed between the aperture stop ST and the image sensor in the embodiment of the present invention, there is also a case where the effective diameter of the lens surface increases and then decreases as it moves from the aperture stop ST toward the sensor.

[0091] Here, the effective diameters of the first lenses 101, 111, 121, 131, and 141 to the fourth lenses 104, 114, 124, 134, and 144 are defined as CA1, CA2, CA3, CA4, and the effective diameters of the object-side surfaces and the sensor-side surfaces of the first lens to the fourth lens may be defined as CA11, CA12, CA21, CA22, CA31, CA32, CA42. The first lenses 101, 111, 121, 131, and 141 may be disposed on the object side of the aperture stop ST, and the second lenses 102, 112, 122, 132, and 142, the third lenses 103, 113, 123, 133, 143, and the fourth lenses 104, 114, 124, 134, and 144 may be disposed on the sensor side of the aperture stop ST.

[0092] As Figure 1 shown, when the aperture stop ST is disposed on the sensor-side surface of the first lens 101, the following conditions may be satisfied: CA12 (or the effective diameter of the aperture stop) < CA11 < CA21 < CA22. The following conditions are satisfied: CA22 < CA31 < CA41. As Fig.24 and Fig.26 shown, when the aperture stop ST is disposed on the sensor-side surfaces of the first lenses 111 and 121, the following conditions may be satisfied.

[0093] Condition 1: CA1 < CA2 < CA3, Condition 2: CA4 < CA3, Condition 3: CA1 < CA4 < CA2

[0094] Condition 4: CA11 ≤ CA12 < CA21 < CA22 < CA31

[0095] Condition 5: CA42 < CA41 < CA32 < CA31

[0096] As Fig.34 and Fig.46 shown, when the aperture stop ST is arranged on the sensor side surfaces of the first lenses 131 and 141, the following conditions can be satisfied.

[0097] Condition 1: CA1 ≤ CA2 < CA3, Condition 2: CA3 < CA4, Condition 3: (2 * ImgH) < CA1 < CA4

[0098] Condition 4: CA12 ≤ CA21 ≤ CA11 ≤ CA22 ≤ CA31

[0099] Condition 5: CA31 ≤ CA32 < CA42 ≤ CA41

[0100] As another example, the aperture stop ST may be arranged around the object side surface of the lens closest to the object side among the lenses of the second lens group LG2.

[0101] The aperture stop ST may be arranged at a set position. For example, the aperture stop ST may be arranged around the object side surface of the lens closest to the object side among the lenses of the second lens group LG2. Alternatively, the aperture stop ST may be arranged around the object side surface of the object side lens of the first lens group LG1. In contrast, at least one lens selected from the plurality of lenses may be used as the aperture stop. Specifically, the object side surface or the sensor side surface of one lens selected from the lenses of the optical system 1000 may be used as the aperture stop for controlling the amount of light.

[0102] The optical axis distance on the optical axis OA between the first lens group LG1 and the second lens group LG2 may be the optical axis distance between the sensor side surface of the lens closest to the sensor side among the lenses of the first lens group LG1 and the object side surface of the lens closest to the object side among the lenses of the second lens group LG2. The optical axis distance between the first lens group LG1 and the second lens group LG2 may be less than the center distance between the adjacent object side aspherical lens and the sensor side spherical lens in the lens portions 100 and 100A to 100D. Additionally, the optical axis distance between the first lens group LG1 and the second lens group LG2 may be less than the center distance between the adjacent object side spherical lens and the sensor side aspherical lens. The optical axis distance between the first lens group LG1 and the second lens group LG2 may be the center distance between the spherical lenses.

[0103] In Figure 1Among them, the optical axis distance between the first lens group LG1 and the second lens group LG2 can be less than 1 times the optical axis distance of the first lens group LG1. For example, it is greater than 0 times the optical axis distance of the first lens group LG1 and less than 0.5 times. The optical axis distance between the first lens group LG1 and the second lens group LG2 can be less than 0.5 times the optical axis distance of the second lens group LG2. For example, it is greater than 0 times and less than 0.2 times. In Fig.14 , Fig.26 , Fig.34 and Fig.46 among them, the optical axis distance between the first lens group LG1 and the second lens group LG2 can be less than 1 times the optical axis distance of the first lens group LG1. For example, it is greater than 0 times the optical axis distance of the first lens group LG1 and less than 0.1 times. The optical axis distance between the first lens group LG1 and the second lens group LG2 can be less than 0.5 times the optical axis distance of the second lens group LG2. For example, it is greater than 0 times the optical axis distance and less than 0.05 times. The optical axis distance of the first lens group LG1 is the optical axis distance from the object-side surface to the sensor-side surface. The optical axis distance of the second lens group LG2 is the optical axis distance between the object-side surface of the lens closest to the object side in the second lens group LG2 and the sensor-side surface of the lens closest to the image sensor 300.

[0104] Here, the first lens group LG1 can be a lens closer to the object side than the aperture stop ST, and the second lens group LG2 can be a lens closer to the sensor side than the aperture stop ST. The first lens group LG1 and the second lens group LG2 can be divided into an object-side lens group and a sensor-side lens group based on the aperture stop ST. The sensor-side surface of the first lens group LG1 can have a convex shape on the optical axis, and the object-side surface of the second lens group LG2 can have a convex shape on the optical axis and can face each other.

[0105] The first lens group LG1 can have a negative (-) refractive power, and the second lens group LG2 can have a positive (+) refractive power. The lens closest to the object in the first lens group LG1 can have a negative (-) refractive power, and the lens closest to the image sensor among the lenses in the second lens group LG2 can have a negative (-) refractive power. That is, the focal lengths of the lenses in the first lens group LG1 have negative values, and the combined focal length of the lenses in the second lens group LG2 has a positive value. When the focal length of the first lens group LG1 is F_LG1 and the focal length of the second lens group LG2 is F_LG2, F_LG1 < F_LG2 can be satisfied, and preferably, |F_LG1| > F_LG2 can be satisfied. That is, F_LG1 < 0 can be satisfied.

[0106] Here, when the combined focal length of the first lens 101, 111, 121, 131, and 141 to the third lens 103, 113, 123, 133, and 143 on the optical system 1000 is set to F13, and the combined focal length of the fourth lens 104, 114, 124, 134, and 144 to the seventh lens 107, 117, 127, 137, and 147 is set to F47, F13 < F47 can be satisfied, and F13, F47 > 0 can be satisfied. Additionally, FLG2 < F13 and |F_LG1| < F47 can be satisfied. Here, F_LG1 is the focal length of the first lens 101, 111, 121, 131, and 141 and can be defined as F1, while F_LG2 is the combined focal length of the second lens 102, 112, 122, 132, and 142 to the seventh lens 107, 117, 127, 137, and 147 and can be defined as F27. The first lens group LG1 diffuses the light incident from the object side, and the second lens group LG2 can be in close contact with the sensor side surface of the first lens group LG1 and refract the light emitted through the first lens group LG1 to the image sensor 300. The optical axis distance between the first lens group LG1 and the second lens group LG2 can be less than 1 mm, for example, 0.8 mm or less.

[0107] When the focal length is expressed as an absolute value, the focal length of the first lens group LG1 can be 1.5 times or more, for example, 1.5 times to 7 times, the focal length of the second lens group LG2. The effective focal length (EFL) of the optical system 1000 can be less than the absolute value of the focal length of the first lens group LG1. The EFL of the optical system 1000 can be less than the absolute value of the focal length of the first lens group LG1 and greater than the absolute value of the focal length of the second lens group LG2.

[0108] The lens parts 100 and 100A to 100D may be a mixture of spherical lenses and aspherical lenses. The number of lenses of the aspherical lenses may be less than 50% of the total number of lenses, and may be in the range of 10% to 45%. When the absolute value of the focal length is expressed, the average value of the composite focal length of the spherical lenses may be less than the average value of the composite focal length of the aspherical lenses. The average value of the refractive index of the aspherical lenses may be less than the average value of the refractive index of the spherical lenses. In addition, the difference between the average effective diameter of the spherical lenses and the average effective diameter of the aspherical lenses may be 1 mm or more, for example, in the range of 1 mm to 3 mm. Therefore, when two or more aspherical lenses are arranged in the camera module, the weight of the camera module may be reduced and the optical characteristics may be improved. The average Abbe number of the spherical material lenses in the lens parts 100 and 100A to 100D may be greater than the average Abbe number of the aspherical lenses. Since the lenses adjacent to the image sensor 300 are arranged to have a low Abbe number and a high refractive index, dispersion can be improved by the lenses adjacent to the image sensor 300. For example, the product of the Abbe number and the refractive index of the n-th lens as the last lens may be smaller than the product of the Abbe number and the refractive index of each of the n-2nd, n-3rd, n-4th, or n-5th lenses. In addition, the product of the Abbe number and the refractive index of the n-1th lens may be smaller than the product of the Abbe number and the refractive index of each of the n-2nd, n-3rd, n-4th, or n-5th lenses.

[0109] In the optical system 1000, the number of lenses having negative (-) refractive power may be less than the number of lenses having positive (+) refractive power. The number of lenses having negative (-) refractive power may be less than 50% of the total number of lenses, for example, may be in the range of 20% to 45%.

[0110] The sum of the refractive indices of the lenses in the lens portions 100 and 100A to 100D of the embodiment may be 8 or greater, for example, in the range of 8 to 15, and the average value of the refractive indices may be in the range of 1.60 to 1.72. The sum of the Abbe numbers of each lens in the lenses may be 220 or greater, for example, in the range of 220 to 380, and the average value of the Abbe numbers may be 55 or less, for example, in the range of 31 to 55. The sum of the central thicknesses of the entire lenses may be 15 mm or greater, for example, in the range of 15 mm to 32 mm, 21 mm to 30 mm, or 15 mm to 28 mm. The average value of the central thicknesses of the entire lenses may be 4 mm or 4.2 mm or less, for example, in the range of 2.7 mm to 4 mm or 3 mm to 4.2 mm. The sum of the central distances on the optical axis OA between the lenses may be 4.5 mm or greater, or 5 mm or greater, for example, in the range of 5 mm to 20 mm, 4.5 mm to 20 mm, or 5 mm to 10 mm, and may be less than the sum of the central thicknesses of the lenses. In addition, the average value of the effective diameters of each lens surface of the lens portions 100 and 100A to 100D may be set to 8 mm or greater, for example, in the range of 8 mm to 15 mm. The difference between the maximum effective diameter and the minimum effective diameter may be 7.5 mm or less, or 5 mm or less. Therefore, an optical system with a small difference in the effective diameter of each lens surface can be provided, and the assembly performance of the lenses assembled in the lens barrel can be improved.

[0111] In the lens portions 100 and 100A to 100D, if the number of aspherical lenses is Ma, the number of lenses with an effective diameter smaller than the diagonal length of the image sensor 300 is Mb, and the number of lenses with a negative refractive power is Mc, the following conditions may be satisfied: Mb ≤ Ma < Mc, and preferably the following conditions may be satisfied: Mb < Ma. In the lens portions 100 and 100A to 100D, if the number of lens surfaces with an aspherical surface is Ma1, the number of lens surfaces with an effective diameter smaller than the diagonal length of the image sensor 300 is Mb1, and the number of lenses with a negative refractive power is Mc, the following conditions may be satisfied: Mb1 ≤ Mc < Ma1, and preferably the following conditions may be satisfied: Mb1 < Mc. The lens surfaces are the object-side surface and the sensor-side surface of each lens.

[0112] In the lens units 100 and 100A to 100D, the number of aspherical lens surfaces is Ma1, the number of aspherical lens surfaces having an effective diameter smaller than the diagonal length of the image sensor 300 is Ma2, and the number of lenses having a negative refractive power is Mc, then the following condition can be satisfied: Ma2 < Mc < Ma1. In the lens unit 100, the number of spherical lenses is Ga, the number of lenses having an effective diameter larger than the diagonal length of the image sensor 300 is Gb, and the number of lenses having a positive refractive power is Gc, then the following condition can be satisfied: Gc < Ga ≤ Gb, and preferably the following condition can be satisfied: Ga < Gb.

[0113] The F-number of the optical system or the imaging device module according to an embodiment of the present invention can be 2.4 or less, for example, in the range of 1.4 to 2.4 or in the range of 1.5 to 1.8. In the optical system according to an embodiment of the present invention, the maximum field of view (diagonal) can be 50 degrees or less, for example, in the range of 20 degrees to 55 degrees or 25 degrees to 40 degrees. The vehicle optical system can have a horizontal field of view (FOV_H) in the Y-axis direction, which is greater than 20 degrees and less than 40 degrees, for example, in the range of 25 degrees to 35 degrees. Additionally, the vertical field of view is provided at a smaller angle than the horizontal field of view and can be 20 degrees or less, for example, in the range of 10 degrees to 20 degrees. At this time, the sensor length in the horizontal direction Y can be 8.064 mm ± 0.5 mm, and the sensor height in the vertical direction X can be 4.54 mm ± 0.5 mm. The horizontal field of view (FOV_H) is the field of view based on the horizontal length of the sensor. Therefore, it is possible to suppress the change in the focal position due to temperature change and provide a vehicle imaging device that well corrects various aberrations.

[0114] The optical system 1000 or the imaging device module may include an image sensor 300. The image sensor 300 can detect light and convert it into an electrical signal. The image sensor 300 can detect the light that sequentially passes through the lens unit 100. The image sensor 300 may include a device capable of detecting incident light, such as a CCD (Charge-Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor). In this regard, the length of the image sensor 300 is the maximum length in the diagonal direction orthogonal to the optical axis OA, and can be smaller than the effective diameter of the lens closest to the object side in the first lens group LG1 and larger than the effective diameter of the lens closest to the sensor side in the second lens group LG2. Here, the number of lenses having an effective diameter larger than the length of the image sensor 300 can be 5 to 6, and the number of lenses having an effective diameter smaller than the length of the image sensor 300 can be 1 to 2.

[0115] The optical system 1000 or the camera module may include an optical filter 500. The optical filter 500 may be disposed between the second lens group LG2 and the image sensor 300. The optical filter 500 may be disposed between the lens closest to the sensor side among the lenses of the lens portion 100 and the image sensor 300. For example, the optical system 100 may be disposed between the last lens and the image sensor 300.

[0116] The cover glass 400 is disposed between the optical filter 500 and the image sensor 300, and can protect the upper portion of the image sensor 300 and prevent the reliability of the image sensor 300 from being reduced. The cover glass 400 can be removed. The optical filter 500 can include an infrared filter or an infrared cutoff (IR cutoff) filter. The optical filter 500 can pass light of a set wavelength band and filter light of different wavelength bands. If the optical filter 500 includes an infrared filter, it can block the radiant heat emitted from external light from being transferred to the image sensor 300. In addition, the optical filter 500 can transmit visible light and reflect infrared light.

[0117] The optical system 1000 according to the embodiment may further include a reflective member (not shown) for changing the path of light. The reflective member may be implemented as a prism that reflects the incident light of the first lens group LG1 toward the lens. Hereinafter, the optical system according to the embodiment will be described in detail.

[0118] The optical system of the embodiment can be applied to a vehicle camera device, and an aspherical lens and a spherical lens can be used together, and the material of the first lenses 101, 111, 121, 131 and 141 can be set to a glass material. This has the following advantages: the glass material is more scratch-resistant and less sensitive to external temperature than a plastic material. In order to more effectively prevent scratches due to foreign matter or when placed in a vehicle, a glass lens is used as the first lens 101, 111, 121, 131 and 141, and the object side surface of the first lens 101, 111, 121, 131 and 141 can have a concave shape so as not to contact with an external structure. If the object side surface of the first lens 101, 111, 121, 131 and 141 is designed to have a convex shape, scratches may occur due to contact with an external structure. In order to monitor the driver while driving, record the front / rear of the vehicle, detect lanes, and detect unexpected objects around the vehicle, the horizontal field of view may be greater than 20 degrees and less than 40 degrees, and may be, for example, in the range of 25 degrees to 35 degrees. The horizontal field of view may be a preset angle of an advanced driver assistance system (ADAD).

[0119] Will refer to Figures 1 to 12 An optical system according to a first embodiment of the present invention is described.

[0120] Reference Figures 1 to 3 , the lens portion 100 of the optical system 1000 according to the first embodiment may include a first lens 101 to a seventh lens 107. The first lens 101 to the seventh lens 107 may be aligned in sequence along the optical axis OA. Light corresponding to information about an object may pass through the first lens 101 to the seventh lens 107 and the optical filter 500, and be incident on the image sensor 300. The first lens 101 is the lens closest to the object in the first lens group LG1. The seventh lens 107 is the lens closest to the image sensor 107 in the second lens group LG2 or the lens portion 100. The first lens 101 may be the first lens group LG1, and the second lens 102 to the seventh lens 107 may be the second lens group LG2.

[0121] The first lens 101 may have positive (+) or negative (-) refractive power on the optical axis OA. The first lens 101 may have negative (-) refractive power. The first lens 101 may include a plastic material or a glass material, and may be, for example, a glass material or a non-molded lens made of a glass material. The first lens 101 made of a glass material may reduce changes in the center position and the radius of curvature caused by temperature changes in the surrounding environment, and may protect the incident side surface of the optical system 1000.

[0122] The object side first surface S1 of the first lens 101 may be concave on the optical axis, and the sensor side second surface S2 may be convex. The first lens 101 may have a meniscus shape convex toward the sensor side on the optical axis. Differently, on the optical axis OA, the first surface S1 may have a convex shape, and the second surface S2 may have a concave shape. The first lens 101 may be provided with a glass material having the thickest thickness, so that the rigidity can be prevented from being deteriorated due to external impact, and the optical performance can be kept constant when the temperature of the glass material becomes low or high temperature. In addition, since the spherical surface is applied to the glass material, even if the thickness of the lens is designed to be thick, the change in the refractive index of light is not large. Here, the thickness of the lens may be an average value of the center thickness and the edge thickness. The thickness of the first lens 101 may be the thickest in the lens portion 100. The thickness of the first lens 101 may be thicker than the thickness of the cemented lens CL1. The center thickness of the first lens 101 may be thicker than the center thickness of the cemented lens CL1. The edge thickness of the first lens 101 may be thicker than the edge thickness of the cemented lens CL1.

[0123] Since the first surface S1 is concave and the second surface S2 is convex on the optical axis, the incident light can be refracted in a direction away from the optical axis, and the center distance CG1 between the first lens 101 and the second lens 102 can be reduced, and the effective diameter of the second lens 102 can be reduced. The first surface S1 of the first lens 101 can be set to have no critical point from the optical axis OA to the end (i.e., edge) of the effective area. The second surface S2 of the first lens 101 can be set to have no critical point.

[0124] The aperture stop ST may be arranged around the sensor-side surface of the first lens 101. Alternatively, the aperture stop ST may be arranged around the object-side or sensor-side surface of the second lens 102, or around the object-side surface of the third lens 103.

[0125] The second lens 102 may be disposed between the first lens 101 and the third lens 103. The second lens 102 may have a positive (+) or negative (-) refractive power on the optical axis OA. The second lens 102 may have a positive (+) refractive power. The second lens 102 may include a plastic or glass material. For example, the second lens 102 may be configured as a glass material. The object-side third surface S3 of the second lens 102 on the optical axis OA may be convex, and the sensor-side fourth surface S4 may be convex. The second lens 102 may have a shape that is convex on both sides on the optical axis. Alternatively, the third surface S3 may be convex, and the fourth surface S4 may be concave. In contrast, the second lens 102 may have a shape that is concave on both sides. The second lens 102 may be configured as a spherical lens made of glass. The third surface S3 and the fourth surface S4 may be spherical. At least one or both of the third surface S3 and the fourth surface S4 may be configured so that there is no critical point from the optical axis OA to the end of the effective area.

[0126] The third lens 103 may have a positive (+) refractive power or a negative (-) refractive power on the optical axis OA. The third lens 103 may have a positive (+) refractive power. The third lens 103 may include a plastic or glass material. For example, the third lens 103 may be set to a glass material or a glass molded material. The object-side fifth surface S5 of the third lens 103 may be convex based on the optical axis, and the sensor-side sixth surface S6 may be concave. The third lens 103 may have a meniscus shape that is convex toward the object side on the optical axis. Alternatively, the third lens 103 may have a meniscus shape that is convex toward the sensor side on the optical axis. Alternatively, the third lens 103 may have a shape that is concave on both sides on the optical axis. The third lens 103 may be set to an aspherical lens made of glass. The fifth surface S5 and the sixth surface S6 may be aspherical, and the aspherical coefficients may be set to Figure 4At least one or both of the fifth surface S5 and the sixth surface S6 may be configured to have no critical point from the optical axis OA to the end of the effective area.

[0127] The optical system 1000 may include at least one (e.g., 1 to 3) aspherical glass lens. The effective radius of the fifth surface S5 or the sixth surface S6 of the third lens 103 may be greater than the effective radius of the object side surface or the sensor side surface of the first lens 101 or the seventh lens 107. The effective diameter of the third lens 103 may have the second largest effective diameter in the lens portion 100. The effective diameter of the third lens 103 may have the largest effective diameter among the aspherical lenses. Since the second lens 102 arranged on the sensor side of the aperture stop ST has a positive refractive power (F2>0), the second lens 102 can refract the incident light in the direction of the optical axis, and the increase in the effective diameter of the sensor side lens or the rear side lens of the second lens 102 can be suppressed. Therefore, the weight yield of the optical system can be prevented from decreasing by the second lens 102, and the production efficiency can be improved. Here, the composite focal length of the second lens 102 to the seventh lens 107 arranged on the sensor side of the aperture stop ST can have a positive value, and the TTL can be reduced within the field of view. The distance between the second lens 102 and the third lens 103 may gradually increase from the center to the edge. Due to the convex shape of the sensor-side surface of the second lens 102 and the convex shape of the object-side surface of the third lens 103, the distance may gradually increase from the optical axis to the edge.

[0128] The fourth lens 104 may have a positive (+) refractive power or a negative (-) refractive power on the optical axis OA. The fourth lens 104 may have a positive (+) refractive power. The fourth lens 104 may include a plastic or glass material. For example, the fourth lens 104 may be set as a glass material. The object side seventh surface S7 of the fourth lens 104 may be convex relative to the optical axis, and the sensor side eighth surface S8 may be convex. The fourth lens 104 may have a shape that is convex on both sides on the optical axis. Alternatively, the seventh surface S7 may have a concave shape on the optical axis OA, and the eighth surface S8 may have a concave or convex shape. Alternatively, the fourth lens 104 may have a meniscus shape that is convex toward the sensor side. The fourth lens 104 may be set as a spherical lens made of glass. The seventh surface S7 and the eighth surface S8 may be spherical. The seventh surface S7 and the eighth surface S8 may be set so that there is no critical point from the optical axis OA to the end of the effective area.

[0129] The fifth lens 105 may have a positive (+) refractive power or a negative (-) refractive power on the optical axis OA. The fifth lens 105 may have a positive (+) refractive power. The fifth lens 105 may include a plastic or glass material. For example, the fifth lens 105 may be provided with a glass material. With respect to the optical axis OA, the object side ninth surface S9 of the fifth lens 105 may be convex, and the sensor side tenth surface S10 may be convex. The fifth lens 105 may have a shape that is convex on both sides on the optical axis OA. In contrast, on the optical axis OA, the ninth surface S9 may have a concave shape, and the tenth surface S10 may have a convex shape. In contrast, the ninth surface S9 may have a concave shape, and the tenth surface S10 may have a concave shape. The fifth lens 105 may be a spherical lens. The ninth surface S9 and the tenth surface S10 of the fifth lens 105 may be spherical. At least one or both of the ninth surface S9 and the tenth surface S10 may be provided so that there is no critical point from the optical axis OA to the end of the effective area.

[0130] The sixth lens 106 may have a positive (+) refractive power or a negative (-) refractive power on the optical axis OA. The sixth lens 106 may have a negative (-) refractive power. The sixth lens 106 may include a plastic or glass material. For example, the sixth lens 106 may be set as a glass material. With respect to the optical axis OA, the object side eleventh surface of the sixth lens 106 may be concave, and the sensor side twelfth surface S12 may be concave. The sixth lens 106 may have a shape that is concave on both sides on the optical axis OA. Alternatively, the sixth lens 106 may have a convex meniscus shape toward the sensor side, or have a convex shape on both sides. The sixth lens 106 may be spherical. For example, the eleventh surface and the twelfth surface S12 may be spherical. The eleventh surface of the sixth lens 106 may be set so that there is no critical point from the optical axis OA to the end of the effective area. The twelfth surface S12 may be set so that there is no critical point from the optical axis OA to the end of the effective area.

[0131] The fifth lens 105 and the sixth lens 106 may be bonded and defined as a cemented lens CL1. The cemented surface between the fifth lens 105 and the sixth lens 106 may be defined as a tenth surface S10. The tenth surface S10 may be the same surface as the eleventh surface of the sixth lens 106. When the distance between the fifth lens 105 and the sixth lens 106 is G5, G5 may be less than 0.01 mm. From the optical axis OA to the end of the effective area, the distance G5 between the fifth lens 105 and the sixth lens 106 may be less than 0.01 mm. The fifth lens 105 and the sixth lens 106 may have opposite refractive powers. The composite refractive power of the fifth lens 105 and the sixth lens 106 may have a positive (+) refractive power. The product of the refractive power of the object side fifth lens 105 of the cemented lens CL1 and the refractive power or focal length of the sensor side sixth lens 106 may be less than 0. Therefore, the aberration characteristics of the optical system may be improved. If the signs of the refractive powers of the two lenses of the cemented lens CL1 are the same, there is a limit to the improvement of the aberration.

[0132] The composite refractive power of the cemented lens CL1 may have positive refractive power, and the fourth lens 104 arranged on the object side based on the cemented lens CL1 may have positive refractive power, and the seventh lens 107 arranged on the sensor side may have negative refractive power. Therefore, the fourth lens 104, the cemented lens CL1, and the seventh lens 107 may refract some of the incident light in the direction of the optical axis.

[0133] The effective diameter of the cemented lens CL1 may be greater than the diagonal length of the image sensor 300. The effective diameter of the fifth lens 105 is an average of the effective diameter of the ninth surface S9 and the effective diameter of the tenth surface S10, and each of the effective diameters of the ninth surface S9 and the tenth surface S10 may be greater than the diagonal length of the image sensor 300. The effective diameter of the sixth lens 106 may be smaller than the effective diameter of the fifth lens 105 and greater than the diagonal length of the image sensor 300. The effective diameter of the seventh surface S7 of the fourth lens 104 may be greater than the diagonal length of the image sensor 300, and the effective diameter of the twelfth surface S12 of the sixth lens 106 may be greater than the diagonal length of the image sensor 300.

[0134] When the sixth lens 106 is a spherical lens and the seventh lens 107 is an aspherical lens, the difference in effective diameter between the object-side eleventh surface S12 of the sixth lens and the sensor-side twelfth surface S12 can be the largest within the lens portion 100. For example, when the effective diameter of the ninth surface of the sixth lens 106 and the effective diameter of the sensor-side twelfth surface S12 are CA61 and CA62, the following condition is satisfied: CA61>CA62, and the difference between CA61 and CA62 can be the largest among the effective diameter differences between the object-side surface and the sensor-side surface of each lens. Therefore, by maximizing the difference in effective diameter between the object-side surface and the sensor-side surface of the sixth lens 106, light can be guided to the effective area of ​​the aspherical lens having a relatively small effective diameter. Therefore, a thinner optical system can be provided. The effective diameter of the sixth lens 106 can satisfy the following condition: 1.10 <CA61 / CA62<1.50。

[0135] The cemented lens CL1 is cemented by glass lenses having different refractive indices, has a spherical refractive surface, and at least one lens positioned on the sensor side compared to the cemented lens CL1 is an aspherical lens, so that spherical aberration can be compensated. In addition, the lens positioned on the sensor side compared to the cemented lens CL1 is an aspherical lens, and is provided with a small effective diameter, so that light can be guided to the entire area of ​​the image sensor 300 by the aspherical lens. The position of the cemented lens CL1 is positioned between the aspherical third lens 103 and the aspherical seventh lens 107, or between the spherical fourth lens 104 and the aspherical seventh lens 107, so that chromatic aberration correction can be more efficient. By arranging the cemented lens CL1 within the optical system, TTL can be reduced.

[0136] The seventh lens 107 may have a positive (+) refractive power or a negative (-) refractive power on the optical axis OA. The seventh lens 107 may have a negative (-) refractive power. The seventh lens 107 may include a plastic or glass material. For example, the seventh lens 107 may be a glass material or a glass molded material. The thirteenth surface S13 on the object side of the seventh lens 107 on the optical axis may be convex, and the fourteenth surface S14 on the sensor side may be concave. The seventh lens 107 may have a meniscus shape that is convex toward the object side on the optical axis. In contrast, the thirteenth surface S13 may have a concave shape on the optical axis OA, and the fourteenth surface S14 may have a convex shape. In contrast, the seventh lens 107 may have a concave shape on both sides. The seventh lens 107 may be made of glass and may have aspherical surfaces on both sides. The thirteenth surface S13 and the fourteenth surface S14 have aspherical surfaces, and the aspherical coefficients may be set to Figure 4L7S1 and L7S2. The seventh lens 107 may be an aspheric lens closest to the image sensor 300. By arranging the aspheric lens closest to the image sensor 300, degradation of optical performance may be prevented, aberration characteristics may be improved, and the impact on resolution may be controlled. In addition, by arranging the aspheric lens as the lens closest to the image sensor 300, the aspheric lens may be insensitive to assembly tolerances compared to a spherical lens. In other words, insensitivity to assembly tolerances means that even if it is assembled slightly differently than designed during assembly, the optical performance may not be significantly affected.

[0137] Reference Figure 2 , at least one or both of the thirteenth surface S13 and the fourteenth surface S14 of the seventh lens 107 may have a critical point. The thirteenth surface S13 of the seventh lens 107 may have at least one critical point from the optical axis OA to the end of the effective area. The critical point of the thirteenth surface S13 may be located at 50% or less of the effective radius from the optical axis OA, or in the range of 30% to 50%, or in the range of 35% to 40%. The critical point of the thirteenth surface S13 may be located at a position less than or equal to 2.1 mm from the optical axis OA, for example, in the range of 1.4 mm to 2.1 mm or in the range of 1.6 mm to 2 mm. As another example, the thirteenth surface S13 may be set to have no critical point. The fourteenth surface S14 of the seventh lens 107 may have at least one critical point from the optical axis OA to the end of the effective area. The critical point of the fourteenth surface S14 may be located at a distance of 65% or more of the effective radius from the optical axis OA, or in a range of 65% to 85%, or in a range of 70% to 80%. The critical point of the fourteenth surface S14 may be located at a position greater than or equal to 3.5 mm from the optical axis OA, for example, in a range of 3.5 mm to 4.3 mm or in a range of 3.6 mm to 4.2 mm. Since the critical point of the fourteenth surface S14 of the seventh lens 107 is positioned further outward than the critical point of the thirteenth surface S13, the incident light may be refracted to the periphery of the image sensor 300.

[0138] BFL (back focal length) is the optical axis distance from the image sensor 300 to the last lens. A tangent K1 passing through any point of the fourteenth surface S14 of the seventh lens 107 and a normal K2 perpendicular to the tangent K1 may have a predetermined angle θ1 with the optical axis OA. Based on an axis parallel to the optical axis, the maximum tangent angle θ1 on the fourteenth surface S14 in the first direction X may be 15 degrees or less, for example, 1 to 15 degrees or 2 to 10 degrees. With respect to an axis parallel to the optical axis, the maximum tangent angle on the thirteenth surface S13 in the first direction X may be 5 degrees or more, for example, in the range of 5 to 40 degrees or in the range of 14 to 34 degrees.

[0139] CT7 is the center thickness or optical axis thickness of the seventh lens 107, and ET7 is the edge thickness of the seventh lens 107. CT6 is the center thickness or optical axis thickness of the sixth lens 106, and ET6 is the edge thickness of the sixth lens 106. The edge thickness is the distance between the object side and the sensor side in the optical axis direction at the end of the effective area of ​​each lens. CG6 is the optical axis distance (i.e., center distance) from the center of the sixth lens 106 to the center of the seventh lens 107. That is, CG6 is the distance from the center of the twelfth surface S12 to the center of the thirteenth surface S13. EG6 is the distance (i.e., edge distance) from the edge of the sixth lens 106 to the edge of the seventh lens 107 in the optical axis direction.

[0140] Figure 3 yes Figure 1 Example of lens data for an optical system. Figure 3 As shown in , the curvature radius of the first to seventh lenses 101 to 107 on the optical axis OA, the center thickness CT of the lens, the center distance CG between adjacent lenses, the refractive index on the d line, the Abbe number and the size of the clear aperture CA can be set.

[0141] When the radius of curvature of each lens on the optical axis is expressed as an absolute value, the radius of curvature of the eighth surface S8 of the fourth lens 104 on the optical axis OA may be the largest among the lenses, and the radius of curvature of the ninth surface S9 of the fifth lens 105 or the twelfth surface S12 of the sixth lens 106 may be the smallest among the lenses. The difference between the maximum radius of curvature and the minimum radius of curvature may be 5 times or more, for example, 5 times to 20 times. The radius of curvature of the third lens 103, which is an aspherical lens, may be smaller than the radius of curvature of the first lens 101, the second lens 102, and the fourth lens 104 made of glass. Here, the radius of curvature is the average of the absolute values ​​of the radius of curvature of the object side surface and the sensor side surface of each lens.

[0142] The first lens 101 disposed on the object side of the aperture stop ST on the optical axis may have a curvature radius greater than the curvature radius of the second lens 102 disposed on the sensor side of the aperture stop ST. The curvature radius of the seventh lens 107 may be greater than the curvature radius of the sixth lens 106. The curvature radius of the seventh lens 107 may be greater than the curvature radii of the fifth lens 105 and the sixth lens 106.

[0143] If the third lens 103 is designed as an aspherical surface, it can satisfy thermal compensation and improve optical performance, but it may not be as easy to assemble as a spherical lens, and due to the assemblability of the aspherical third lens, the optical characteristics of the lens arranged on the sensor side may be affected by the aspherical third lens 103. If the third lens is a spherical lens, even if the optical characteristics of the third lens are affected, the radius of curvature of the third lens on the optical axis will not change significantly due to the spherical characteristics. The present invention designs the radius of curvature of the third lens 103 having an aspherical surface to exceed 10 mm, and designs the effective diameter to be large, so that it can be easily assembled. In addition, when the radius of curvature on the optical axis is large, the shape of the lens is gently formed, so that even if it is assembled slightly tilted from the optical axis, the influence on the lens on the sensor side may be minimized.

[0144] In addition, the reason why the first spherical lens 101 has the largest radius of curvature after the fourth lens 104 is that the lens disposed on the object side of the aperture stop ST is the lens most sensitive to optical characteristics, so the radius of curvature is set larger or the thickness is increased. Here, a sensitive lens refers to a lens that has a large influence on the optical system even if there is a slight error in assembly. Therefore, the lens disposed on the object side of the aperture is most sensitive to assembly, so the radius of curvature of the lens adjacent to the aperture stop is designed to be the largest, and then the radius of curvature of the first lens that is sensitive to assembly is increased.

[0145] Since the third lens 103 is set as an aspherical surface, the radius of curvature on the optical axis does not increase, and the difference in the radius of curvature between the object side and the sensor side does not become larger, and thermal compensation can be performed by the glass material, and assembly can be improved by the effective diameter, and the influence on optical characteristics can be reduced.

[0146] The curvature radius of the seventh lens 107 may be greater than the curvature radius of the sixth lens 106 made of glass. Therefore, the seventh lens 107 may guide light incident through the first to sixth lenses 101 to 106 to the entire area of ​​the image sensor 300. When the curvature radius of the seventh lens 117 is greater than the curvature radius of the sixth lens 116, assembly characteristics of the final aspherical lens may be improved, and changes in optical characteristics may be minimized.

[0147] Define the radii of curvature of the first surface S1 and the second surface S2 of the first lens 101 as L1R1 and L1R2, the radii of curvature of the thirteenth surface S13 and the fourteenth surface S14 of the seventh lens 107 as L7R1 and L7R2, and the radii of curvature of each lens surface of the second lens to the sixth lens 102 to 106 can be defined as L2R1, L2R2, L3R1, L3R2, L4R1, L4R2, (L5R1), L5R2, L6R1, and L6R2. The radii of curvature of each lens surface can satisfy the following conditions.

[0148] Condition 1: 0 < |L1R1 / L1R2| < 1, Condition 2: 0.5 < |L2R1 / L2R2| < 2

[0149] Condition 3: 0.2 < L3R1 / L3R2 < 1.2, Condition 4: 0 < |L4R1 / L4R2| < 0.5

[0150] Condition 5: 0 < |L5R1 / L5R2| < 0.7, Condition 6: 1 < |L6R1 / L6R2| < 2.5

[0151] Condition 7: 1.5 < L7R1 / L7R2 < 4.5, Condition 8: 1 mm ≤ |L3R2 - L3R1| ≤ 10 mm Condition 9: 10 mm < L7R1 - L7R2 < 50 mm

[0152] When the difference between the object-side radius of curvature and the sensor-side radius of curvature of the third lens 103 is set within the above range, the assembly performance of the third lens 103 with an aspherical surface can be improved, and the optical influence caused by the third lens 103 can be reduced.

[0153] When the central thicknesses of the first lens to the seventh lens 101 to 107 are defined as CT1 to CT7, and the edge thicknesses of the first lens to the seventh lens 101 to 107 are defined as ET1 to ET7, the sum of the central thicknesses of the first lens to the seventh lens 101 to 107 can be defined as ∑CT, and the sum of the edge thicknesses of the first lens to the seventh lens 101 to 107 can be defined as ∑ET. Regarding the thickness of the lens, the central thickness CT1 of the first lens 101 can be greater than the central thicknesses CT2 to CT7 of the second lens to the seventh lens 102 to 107, and can have the maximum thickness within the lens portion 100. The central thickness CT7 of the seventh lens 107 can be less than the central thicknesses CT1 to CT6 of the first lens to the sixth lens 101 to 106, and can have the minimum thickness within the lens portion 100. The aspherical lenses can include the third lens 103 and the seventh lens 107. The central thickness CT1 of the first lens 101 can be greater than 100% of the central thickness CT56 of the cemented lens CL1, for example, within the range of 101% to 150%. The thickness of each lens can satisfy at least one of the following conditions.

[0154] Condition 1: 0.6 < CT1 / ET1 < 1.3, Condition 2: 1 < CT2 / ET2 < 2.5

[0155] Condition 3: 1 < CT3 / ET3 < 2, Condition 4: 1.2 < CT4 / ET4 < 2.5

[0156] Condition 5: 1.5 < CT5 / ET5 < 3.5, Condition 6: 0 < CT6 / ET6 < 1

[0157] Condition 7: 0.5 < CT7 / ET7 < 1.2, Condition 8: 0.8 < ∑CT / ∑ET < 1.2

[0158] Condition 9: 0.24 < CT1 / ∑CT < 0.44

[0159] In this way, the difference between the central thickness and the edge thickness of each lens can be set to be greater than 0.6 mm and less than 4 mm. This can effectively guide light without increasing the difference between the central thickness and the edge thickness of each lens by arranging the aspherical lenses in the third lens 103 and the seventh lens 107. In addition, by setting the difference between the central thickness and the edge thickness of the third lens 103 within the range of Condition 3, the difference in the radius of curvature between the object side and the sensor side can be designed not to be large, the assemblability of the aspherical third lens 103 can be improved, and the influence on the optical characteristics can be reduced.

[0160] In addition, the difference between the maximum center thickness and the minimum center thickness of the lens can be 3 mm or more, for example, within the range of 3 mm to 8 mm or 3 mm to 7 mm. That is, even if the center thickness of the final aspherical lens is set thin, the optical performance may not deteriorate, and the thickness of the imaging device module can be set thin. In addition, since the difference between the center thickness and the edge thickness of each lens is not large, even if at least one lens is tilted, the influence on the optical characteristics can be reduced. The influence on the thermal characteristics between the center part and the edge part of the lens can also be reduced. The maximum center thickness can be greater than the sum of the center thicknesses of two adjacent lenses. For example, the conditions can be satisfied: (CT2 + CT3) < CT1, (CT3 + CT4) < CT1, (CT4 + CT5) < CT1, (CT5 + CT6) < CT1, and (CT6 + CT7) < CT1.

[0161] The center distances between the first lens to the seventh lens 101 to 107 can be defined as CG1 to CG6, and the sum of the center distances between the first lens to the seventh lens 101 to 107 can be defined as ∑CG.

[0162] The center distance CG3 between the third lens 103 and the fourth lens 104 is the center distance between an aspherical lens and a spherical lens, which is the largest within the lens portion 100 and greater than the center distance between spherical lenses. That is, the distance CG3 between the adjacent object-side aspherical lens and the sensor-side spherical lens can be the largest within the lens portion 100 and can be equal to or less than the center thickness of the cemented lens CL1. For example, it is 84% or more of the center thickness of the cemented lens CL1, for example, within the range of 84% to 95%. The center distance CG6 between the sixth lens 106 and the seventh lens 107 can be less than the center distance CG3 and is the second largest within the lens portion 100. That is, the distance CG6 between the adjacent object-side spherical lens and the sensor-side aspherical lens can satisfy the following conditions: CT7 < CG6 < CG3 < CT1. The distances between the center thicknesses of each lens and the center distances between adjacent lenses can satisfy the following conditions (here, the gaps within the cemented lens are not included).

[0163] Condition 1: 10 < CT1 / CG1 < 30, Condition 2: 1 < CG6 / CT7 < 3

[0164] Condition 3: 1 < CG3 / CT3 < 3, Condition 4: (CG6 / CT7) < (CG3 / CT3)

[0165] Condition 5: 0.2 < CG3 / ∑CG < 0.7, Condition 6: 1 < CT1 / CG3 < 2

[0166] By setting the maximum center thickness between the lenses to 1.1 times or more of the maximum center distance, for example, in the range of 1.1 times to 2 times, without increasing the center distance compared to the center thickness of each lens, an imaging device module applying an aspherical lens within an optical system can be provided. In Condition 3, since the aspherical third lens 103 is set to a meniscus shape convex toward the object side, the distance between the third lens 104 and the fourth lens 105 can be set relatively large. Here, if the i-th center distance between two adjacent lenses is defined as CGi, and the center thickness of the i-th lens positioned closer to the object side than CGi is defined as CTi, the following conditions can be satisfied (here, the distance between cemented lenses and cemented lenses is not included). The ratio of CTi / CGi is the largest when i = 1 and the smallest when i = 3. The reason why the value of CTi / CGi is the smallest when i = 3 can be achieved by the third lens 103 made of an aspherical glass material.

[0167] If the optical axis distance from the center of the object-side surface of the first lens 101 to the surface of the image sensor 300 is TTL, the following conditions can be satisfied.

[0168] Condition 1: 0 < CT1 / TTL < 0.5

[0169] Preferably, Condition 1 can satisfy 0.18 ≤ CT1 / TTL ≤ 0.3. Since the first lens 101 is made of a glass material of a spherical lens, the following optical system can be designed: it can satisfy the thermal compensation according to temperature changes by the thickness of the first lens 101 that satisfies Condition 1. That is to say, Condition 1 can be a characteristic that appears when the first lens 101 is designed as a spherical glass. The CT1 / TTL value of Condition 1 can be greater than the values of the following Conditions 2 to 7.

[0170] Condition 2: 0.1 < CT2 / TTL < 0.5, Condition 3: 0 < CT3 / TTL < 0.1

[0171] Condition 4: 0 < CT4 / TTL < 0.1, Condition 5: 0 < CT5 / TTL < 0.15

[0172] Condition 6: 0 < CT6 / TTL < 0.1, Condition 7: 0 < CT7 / TTL < 0.1

[0173] Regarding the effective diameter, the lens with the largest effective diameter can be the fourth lens 104 closest to the object. The fourth lens 104 with the largest effective diameter can be a spherical lens. The lens with the smallest effective diameter can be the lens closest to the image sensor 300, for example, the seventh lens 107. The fourth lens 104 with the largest effective diameter can be placed between the third lens 103 with an aspherical surface and the cemented lens CL1.

[0174] The effective diameters of the first to seventh lenses 101 to 107 may be defined as CA1, CA2, CA3, CA4, CA5, CA6, and CA7, the effective diameters of the first surface S1 and the second surface S2 of the first lens 101 may be defined as CA11 and CA12, the effective diameters of the thirteenth surface S13 and the fourteenth surface S14 of the seventh lens 107 may be defined as CA71 and CA72, and the effective diameters of the object-side surfaces and the sensor-side surfaces of the second to sixth lenses may be defined as CA21, CA22, CA31, CA32, CA41, CA42, CA51, CA52, CA61, and CA62. The effective diameters may satisfy the following conditions.

[0175] Condition 1: CA11 <CA21<CA22

[0176] Condition 2: CA71 <CA72

[0177] Condition 3: CA22 <CA31<CA41

[0178] Condition 4: (CA11-CA12) < (CA61-–CA62)

[0179] Condition 5: CA71 <CA61<CA51<CA41

[0180] Condition 5: CA1 <CA2<CA3<CA4

[0181] Condition 6: CA4>CA5>CA6>(2*ImgH)>CA7

[0182] As in Condition 1, even if the effective diameter of the first lens 101 is set smaller than the effective diameter of the second lens 102, thermal compensation can be more effective due to the spherical glass material and the thick thickness, and assembly characteristics can be improved.

[0183] In terms of refractive index, at least one of the first lens 101 and the third lens 103 has the largest refractive index among the lenses, and preferably, the refractive index of the first lens 101 can be the largest and can be 1.72 or greater. The difference in refractive index between the first lens 101 and the third lens 103 is 0.10 or less. The refractive index of the fourth lens 104 is the smallest among the lenses. The difference between the largest refractive index and the smallest refractive index can be 0.20 or greater. By adjusting the refractive indices of the spherical lens and the aspherical lens, the incident efficiency can be improved, and the incident light can be guided to the image sensor 300. In terms of Abbe number, the Abbe number of the fourth lens 104 is the largest among the lenses and can be 65 or greater. The Abbe number of the first lens 101 is the smallest among the lenses. The difference between the largest refractive index and the smallest Abbe number can be 30 or greater. By making the Abbe number of the object-side lens based on the aperture stop ST small, the Abbe number of the sensor-side lens based on the aperture stop ST large, and setting the Abbe number of the aspherical seventh lens 107 closest to the image sensor 300 small, the dispersion of the light traveling between the lenses made of glass can be controlled, and the dispersion between the spherical lens and the aspherical lens can be increased and guided to the image sensor 300.

[0184] If the average effective diameter of the spherical lens is GL_CA_Aver and the average effective diameter of the aspherical lens is GM_CA_Aver, the following condition can be satisfied: GM_CA_Aver < GL_CA_Aver. If the average center thickness of the spherical lens is GL_CT_Aver and the average center thickness of the aspherical lens is GM_CT_Aver, the following condition can be satisfied: GM_CT_Aver < GL_CT_Aver. If the average refractive index of the spherical lens is GL_nd_Aver and the average refractive index of the aspherical lens is GM_nd_Aver, the following condition can be satisfied: GL_nd_Aver < GM_nd_Aver. If the average Abbe number of the spherical lens is GL_Ad_Aver and the average Abbe number of the aspherical lens is GM_Ad_Aver, the following condition can be satisfied: GM_Ad_Aver < GL_Ad_Aver.

[0185] The focal lengths F1 of the first lens 101, F6 of the sixth lens 106, and F7 of the seventh lens 107 have negative refractive powers, and the focal lengths F2 of the second lens 102, F3 of the third lens 103, F4 of the fourth lens 104, and F5 of the fifth lens 105 can have positive refractive powers. In addition, the fifth lens 105 and the sixth lens 106 arranged adjacent to each other can satisfy the following conditions.

[0186] Condition 1: The refractive index of the lens with positive refractive power < the refractive index of the lens with negative refractive power

[0187] Condition 2: Dispersion of a lens with positive refractive power > dispersion of a lens with negative refractive power

[0188] Here, the fifth lens 105 has positive refractive power, and the sixth lens 106 has negative refractive power, and as in conditions 1 and 2, the refractive index of the fifth lens 105 is smaller than the refractive index of the sixth lens 106, and the dispersion value of the fifth lens 105 is larger than the dispersion value of the sixth lens 106. Therefore, chromatic aberration occurring in a spherical lens can be corrected with an aspherical lens. In addition, by satisfying that the refractive index difference between the fifth lens 105 and the sixth lens 106 arranged in sequence is 0.01 or more and 0.15 or less, and the Abbe number difference is 20 or more and 60 or less, chromatic aberration occurring in a spherical lens can be compensated with a cemented lens. Here, the refractive index difference is rounded to the third decimal place, and the Abbe number difference is rounded to the first decimal place, so as to compare these values.

[0189] The optical system 1000 generates chromatic aberration, and corrects the chromatic aberration by using a cemented lens CL1 or two lenses arranged in series. The lens repeatedly contracts and expands as the temperature changes from low to high. Since the lens characteristics of lenses of the same material change by the same amount according to temperature changes, it is effective to correct the chromatic aberration between lenses of the same material even in the case of temperature changes. In addition, the chromatic aberration occurring in the spherical lens can be corrected by using the third lens 103 and the seventh lens 107, and the chromatic aberration between the spherical lens and the aspherical lens can be mutually corrected by using the sixth lens 106 and the seventh lens 107. In addition, by arranging a glass lens with a relatively high Abbe number at the fifth lens 105 of the cemented lens CL1 arranged on the object side of the aspherical seventh lens 107, dispersion can be reduced by the glass lens, and dispersion can be increased by the aspherical lens.

[0190] When the focal length is expressed as an absolute value, the focal length of the third lens 103 is the largest among the lenses and can be 45 or more. The focal length of the sixth lens 106 is the smallest among the lenses. The difference between the maximum focal length and the minimum focal length can be 35 mm or more. By maximizing the focal length of the aspherical third lens 103 on the object side and setting the focal length of the sixth lens 106 adjacent to the last aspherical lens to the minimum, the optical system can have improved MTF characteristics, aberration control characteristics, resolution characteristics, etc. in a set field of view range, and can have good optical performance in the peripheral part of the field of view.

[0191] The sensor-side surface of the seventh lens 107 has a critical point. The critical point is a point at which the trend of the sag value changes. That is, a point at which the sag value increases and then decreases, or a point at which the sag value decreases and then increases. It can be seen that the sensor-side surface of the seventh lens 107 has a critical point between a point of 3.5 mm and a point of 4.4 mm in a direction perpendicular to the optical axis based on the optical axis. For example, the sag value of the sensor-side surface of the seventh lens 107 increases in a direction perpendicular to the optical axis until the critical point, and then decreases toward the edge after the critical point. If the critical point exists on the sensor-side surface of the seventh lens 107, that is, the sensor side of the last lens, that is, on the lens surface closest to the sensor, TTL can be reduced, thereby facilitating miniaturization and lightening of the optical system.

[0192] exist Figure 2 , Sag51 represents the sag value of the object-side surface of the fifth lens 105, Sag62 represents the sag value of the sensor-side surface of the sixth lens 106, Sag72 represents the sag value of the sensor-side surface of the seventh lens, and the sag value of the object-side surface of the seventh lens can be expressed as Sag 71. The sag value has a positive value when the lens surface is positioned closer to the sensor than the center of each lens surface, and has a negative value when the lens surface is positioned closer to the object than the center of each lens surface.

[0193] like Figure 4 As shown in , the lens surfaces of the third lens 103 and the seventh lens 107 among the lenses of the lens portion 100 may include an aspheric surface having a 30th order aspheric coefficient. For example, the third lens 103 and the seventh lens 107 may include a lens surface having a 30th order aspheric coefficient. As described above, since the aspheric surface having a 30th order aspheric coefficient (non-zero value) can significantly change the aspheric shape of the peripheral portion, the optical performance of the peripheral portion of the field of view (FOV) can be well compensated. Figure 5As shown in , the thicknesses T1 to T7 of the first to seventh lenses 101 to 107 and the distances G1 to G6 between two adjacent lenses can be set. The thickness T1 to T7 of each lens in the Y-axis direction can be expressed at intervals of 0.1 mm or 0.2 mm or more, and the distances G1 to G6 between the lenses can be expressed at intervals of 0.1 mm or 0.2 mm or more. The center thickness CT56 of the cemented lens CL1 can be greater than the edge thickness ET56. The center thickness CT56 of the cemented lens CL1 is the distance from the center of the ninth surface S9 on the object side of the fifth lens 105 to the center of the twelfth surface S12 of the sixth lens 106, and the edge thickness ET56 is the distance from the end of the effective area of ​​the ninth surface S9 to the twelfth surface S12 in the optical axis direction. The maximum thickness of the cemented lens CL1 is the center, the minimum thickness is the edge, and the maximum thickness can be at least 1 times the minimum thickness, for example, in the range of 1 times to 1.5 times. The cemented lens CL1 can satisfy the following conditions: 0mm <CT56-ET56<2mm。

[0194] like Figure 6 As shown in Figure 1 The chief ray angle (CRA) of the optical system and the camera module may be at least 10 degrees, for example, in the range of 10 degrees to 35 degrees or in the range of 10 degrees to 25 degrees. Fig.13 As shown in , the graph showing the relative illumination according to the image height in the optical system according to the embodiment shows that the relative illumination from the center to the diagonal end of the image sensor is 70% or more, for example, 75% or more. That is, it can be seen that the difference in relative illumination (zoom positions 1, 2, 3) according to temperature is almost the same up to 4.4 mm from the optical axis.

[0195] Figures 7 to 9 It is shown Figure 1 Graphs of diffraction MTF at room temperature, low temperature, and high temperature in an optical system of FIG. 1 and FIG. 2 are graphs showing modulation according to spatial frequency. Figures 7 to 9 As shown in , in embodiments of the present invention, the deviation of the MTF relative to room temperature and low or high temperature may be less than 10%, ie, 7% or less. Figures 10 to 12 It is shown Figure 1 The aberration characteristics of the optical system at room temperature, low temperature and high temperature are plotted. Figures 10 to 12 In the aberration graph of , spherical aberration (longitudinal spherical aberration), astigmatism field curve and distortion are measured from left to right. Figures 10 to 12In , the X-axis may represent the focal length (mm) and the degree of distortion (%), and the Y-axis may represent the image height. In addition, the graph of spherical aberration is a graph of light in the wavelength bands of about 435nm, about 486nm, about 546nm, about 587nm, and about 656nm, and the graph of astigmatism and distortion is a graph of light in the wavelength band of about 546nm. Figures 10 to 12 , it can be understood that when each curve at room temperature, low temperature, and high temperature is close to the Y-axis, the aberration correction function is better, and it can be seen that according to the optical system 1000 of the embodiment, the measured value is adjacent to the Y-axis in almost all areas. That is, the optical system 1000 according to the embodiment has improved resolution and can have good optical performance not only in the central part of the FOV but also in the peripheral part. Here, the low temperature is -20 degrees or less, for example, -20 degrees to -40 degrees, the room temperature is 22 degrees ± 5 degrees or 18 degrees to 27 degrees, and the high temperature can be 85 degrees or more, for example, 85 degrees to 105 degrees. Therefore, it can be seen that Figures 10 to 12 The decrease in brightness ratio (modulation) from low temperature to high temperature is less than 10%, for example, 5% or less, or is almost unchanged.

[0196] Table 1 compares the changes in optical properties (such as EFL, BFL, F number, TTL and FOV) at room temperature, low temperature and high temperature in the optical system according to the embodiment, and it can be seen that based on room temperature, the change rate of the optical properties at low temperature is 5% or less, for example, 3% or less, and it can be seen that based on room temperature, the change rate of the optical properties at low temperature is 5% or less, for example, 3% or less.

[0197] [Table 1]

[0198] Room temperature Low temperature high temperature Low temperature / room temperature High temperature / room temperature EFL(F) 15.1 15.1 15.2 99.89％ 100.14％ BFL 3.2 3.2 3.2 99.88％ 100.14％ F# 1.6 1.59 1.6 99.89％ 100.15％ TTL 36.7 36.6 36.7 99.92％ 100.10％ FOV 34.3 34.3 34.2 100.11％ 99.86％

[0199] As shown in Table 1, the change in optical characteristics according to the temperature change from low temperature to high temperature, for example, the rate of change of EFL, TTL, BFL, F number and diagonal FOV is 10% or less, that is, 5% or less, for example, 0 to 5%. This means that even if at least one or two or more aspherical lenses are used, temperature compensation for the aspherical lenses can be designed to prevent the reliability of the optical characteristics from being reduced. In this way, since the third lens 103 and the seventh lens 107 are set with aspherical glass materials, it can be seen that thermal compensation can be performed in the entire optical system according to the temperature change from low temperature to high temperature, and it can be seen that the optical characteristics are not affected by the assembly of these lenses. The optical system of the first embodiment disclosed above can effectively control aberration characteristics such as chromatic aberration and distortion aberration, and can have good optical performance not only in the central part of the FOV but also in the peripheral part.

[0200] Will refer to Figures 14 to 25 An optical system 1000 according to a second embodiment is described. When describing the second embodiment, the contents that are the same as or overlap with those of the first embodiment will refer to the description of the first embodiment and may be included, replaced, or applied to the second embodiment. Figures 14 to 16 , the lens section 100A of the optical system 1000 according to the second embodiment may include first to seventh lenses 111 to 117. The first lens 111 is a lens closest to the object side in the first lens group LG1. The seventh lens 117 is a lens closest to the image sensor 117 in the second lens group LG2 or the lens section 100A. The first lens 111 may be the first lens group LG1, and the second to seventh lenses 112, 113, 114, 115, 116, and 117 may be the second lens group LG2.

[0201] The first lens 111 may have a negative (-) refractive power. The first lens 111 may be made of glass or a glass non-molding material. The object-side first surface S1 of the first lens 111 may be concave relative to the optical axis, and the sensor-side second surface S2 may be convex. The thickness of the first lens 111 may be the thickest in the lens portion 100A. The thickness of the first lens 111 may be thicker than the thickness of the cemented lens CL2. The thickness of the first lens 111 may be a center thickness or an average value of a center thickness and an edge thickness. The center thickness of the first lens 111 may be thicker than the center thickness of the cemented lens CL2. The edge thickness of the first lens 111 may be thicker than the edge thickness of the cemented lens CL2. The first surface S1 of the first lens 111 may be arranged to have no critical point from the optical axis OA to the end, i.e., the edge, of the effective area. The second surface S2 of the first lens 111 may be arranged to have no critical point.

[0202] The aperture stop ST may be arranged around the sensor-side surface of the first lens 111. Alternatively, the aperture stop ST may be arranged around the object-side or sensor-side surface of the second lens 112, or around the object-side surface of the third lens 113.

[0203] The second lens 112 may have a positive (+) refractive power on the optical axis OA. The second lens 112 may be provided with a glass material. The object-side third surface S3 of the second lens 112 may be convex relative to the optical axis OA, and the sensor-side fourth surface S4 may be convex. At least one or both of the third surface S3 and the fourth surface S4 may be provided so that there is no critical point from the optical axis OA to the end of the effective area.

[0204] The third lens 113 may have a positive (+) refractive power. The third lens 113 may be provided with a glass material or a glass molded material. The object-side fifth surface S5 of the third lens 113 may be convex with respect to the optical axis, and the sensor-side sixth surface S6 may be concave. The third lens 113 may be provided as an aspherical lens made of glass. The fifth surface S5 and the sixth surface S6 may be aspherical, and the aspherical coefficient may be set to Fig.17 At least one or both of the fifth surface S5 and the sixth surface S6 may be arranged to have no critical point from the optical axis OA to the end of the effective area.

[0205] In the optical system 1000, there may be at least one, for example, 1 to 3 aspherical glass lenses. The effective radius of the fifth surface S5 or the sixth surface S6 of the third lens 113 may be larger than the effective radius of the object side surface or the sensor side surface of the first lens 111 or the seventh lens 117. The effective diameter of the third lens 113 may have the largest effective diameter in the lens portion 100A. The effective diameter of the third lens 113 may have the largest effective diameter among the spherical lens and the aspherical lens.

[0206] Since the second lens 112 has a positive refractive power (F2>0), the second lens 112 can refract the incident light in the direction of the optical axis, and the effective diameter of the sensor side or rear side lens of the second lens 112 can be suppressed from increasing. The distance between the second lens 112 and the third lens 113 can gradually increase from the center to the edge. Due to the convex shape of the sensor side surface of the second lens 112 and the convex shape of the object side surface of the third lens 113, the distance can gradually increase from the optical axis to the edge.

[0207] The fourth lens 114 may have a positive (+) refractive power on the optical axis OA. The fourth lens 114 may be provided with a glass material. The object-side seventh surface S7 of the fourth lens 114 may be concave relative to the optical axis, and the sensor-side eighth surface S8 may be convex. The fourth lens 114 may be provided with a spherical lens made of glass. The seventh surface S7 and the eighth surface S8 may be spherical. The seventh surface S7 and the eighth surface S8 may be provided so that there is no critical point from the optical axis OA to the end of the effective area.

[0208] The fifth lens 115 may have a positive (+) refractive power on the optical axis OA. The fifth lens 115 may be provided with a glass material. Based on the optical axis OA, the ninth surface S9 of the fifth lens 115 on the object side may be convex, and the tenth surface S10 on the sensor side may be convex. The fifth lens 115 may be a spherical lens. The ninth surface S9 and the tenth surface S10 of the fifth lens 115 may be spherical. At least one or both of the ninth surface S9 and the tenth surface S10 may be provided so that there is no critical point from the optical axis OA to the end of the effective area.

[0209] The sixth lens 116 may have a negative (-) refractive power on the optical axis OA. The sixth lens 116 may be provided with a glass material. Based on the optical axis OA, the object-side eleventh surface of the sixth lens 116 may be concave, and the sensor-side twelfth surface S12 may be concave. The sixth lens 116 may be spherical. For example, the eleventh surface and the twelfth surface S12 may be spherical. The eleventh surface of the sixth lens 116 may be provided so that there is no critical point from the optical axis OA to the end of the effective area. The twelfth surface S12 may be provided so that there is no critical point from the optical axis OA to the end of the effective area.

[0210] The fifth lens 115 and the sixth lens 116 may be bonded or joined and may be defined as a cemented lens CL2. The bonding surface between the fifth lens 115 and the sixth lens 116 may be defined as a tenth surface S10. The tenth surface S10 may be the same surface as the eleventh surface of the sixth lens 116. When the distance between the fifth lens 115 and the sixth lens 116 is G5, G5 may be less than 0.01 mm. The distance G5 between the fifth lens 115 and the sixth lens 116 may be less than 0.01 mm from the optical axis OA to the end of the effective area. The fifth lens 115 and the sixth lens 116 may have opposite refractive powers. The composite refractive power of the fifth lens 115 and the sixth lens 116 may have a positive (+) refractive power.

[0211] The product of the refractive power of the fifth lens 115 on the object side of the cemented lens CL2 and the refractive power or focal length of the sixth lens 116 on the sensor side may be less than 0. Therefore, the aberration characteristics of the optical system may be improved. If the signs of the refractive powers of the two lenses of the cemented lens CL2 are the same, there is a limit to the improvement of the aberration. The composite refractive power of the cemented lens CL2 may have a positive refractive power, and the fourth lens 114 arranged on the object side relative to the cemented lens CL2 may have a positive refractive power, and the seventh lens 117 arranged on the sensor side may have a negative refractive power. Therefore, the fourth lens 114, the cemented lens CL2, and the seventh lens 117 may refract some of the incident light in the direction of the optical axis. The effective diameter of the cemented lens CL2 may be greater than the diagonal length of the image sensor 300. The effective diameter of the fifth lens 115 is the average of the effective diameters of the ninth surface S9 and the tenth surface S10, and the effective diameter of each of the ninth surface S9 and the tenth surface S10 may be greater than the diagonal length of the image sensor 300. The effective diameter of the sixth lens 116 may be smaller than the effective diameter of the fifth lens 115 and greater than the diagonal length of the image sensor 300 .

[0212] The effective diameter of the seventh surface S7 of the fourth lens 114 may be greater than the diagonal length of the image sensor 300, and the effective diameter of the twelfth surface S12 of the sixth lens 116 may be less than the diagonal length of the image sensor 300. The difference in effective diameter between the eleventh surface on the object side and the twelfth surface S12 on the sensor side of the sixth lens 116 may be the largest among the lenses. For example, if the effective diameter of the ninth surface of the sixth lens 116 and the effective diameter of the twelfth surface S12 on the sensor side are CA61 and CA62, the following condition is satisfied: CA61>CA62, and the difference between CA61 and CA62 may be the largest among the effective diameter differences between the object side surface and the sensor side surface of each lens. Therefore, by maximizing the effective diameter difference between the object side surface and the sensor side surface of the sixth lens 116, light can be guided to the effective area of ​​the aspheric lens having a relatively small effective diameter. Therefore, a thinner optical system can be provided. The effective diameter of the sixth lens 116 may satisfy the following conditions: 1.10 <CA61 / CA62<1.50。

[0213] The cemented lens CL2 is made of glass lenses with different refractive indices, has a spherical refractive surface, and at least one lens positioned closer to the sensor than the cemented lens CL2 is an aspherical lens, so that spherical aberration can be compensated. In addition, the lens positioned closer to the sensor than the cemented lens CL2 is an aspherical lens, and has a small effective diameter, so that light can be guided to the entire area of ​​the image sensor 300 by the aspherical lens. The position of the cemented lens CL2 is between the aspherical third lens 113 and the aspherical seventh lens 117, or between the spherical fourth lens 114 and the aspherical seventh lens 117, so that chromatic aberration correction can be more effective. By positioning the cemented lens CL2 within the optical system, TTL can be reduced.

[0214] The seventh lens 117 may have a negative (-) refractive power on the optical axis OA. The seventh lens 117 may be made of a glass material or a glass molded material. The object-side thirteenth surface S13 of the seventh lens 117 on the optical axis may be concave, and the sensor-side fourteenth surface S14 may be concave. The thirteenth surface S13 and the fourteenth surface S14 may have aspherical surfaces, and the aspherical coefficient may be set to Fig.17 L7S1 and L7S2 of the seventh lens 117. At least one or both of the thirteenth surface S13 and the fourteenth surface S14 of the seventh lens 117 may be arranged to have no critical point. The seventh lens 117 may be an aspherical lens closest to the image sensor 300. Since the aspherical lens is arranged closest to the image sensor 300, degradation of optical performance may be prevented, and influence on improvement of aberration characteristics and resolution may be controlled.

[0215] Reference Fig.15, the distance from the center of the sensor-side fourteenth surface S14 of the seventh lens 117 to the edge of the fourteenth surface S14 and the straight line perpendicular to the center of the sensor-side surface of the seventh lens 117 may gradually increase. Differently, the thirteenth surface S13 of the seventh lens 117 may have at least one critical point from the optical axis OA to the end of the effective area. Differently, the fourteenth surface S14 of the seventh lens 117 may have at least one critical point from the optical axis OA to the end of the effective area. Based on an axis parallel to the optical axis, the maximum tangent angle θ1 on the fourteenth surface S14 in the first direction X may be 15 degrees or less, for example, in the range of 1 degree to 15 degrees or in the range of 2 degrees to 10 degrees. Based on an axis parallel to the optical axis, the maximum tangent angle on the thirteenth surface S13 in the first direction X may be 5 degrees or more, for example, in the range of 5 degrees to 40 degrees or in the range of 10 degrees to 30 degrees. The seventh lens 117 may have a small inclination angle between the thirteenth surface S13 and the fourteenth surface S14, and an effective diameter of 90% or more, for example, in the range of 90% to 99%, of the diagonal length of the image sensor 300. Therefore, the light refracted from the seventh lens 117 may be refracted to the entire area of ​​the image sensor 300.

[0216] Fig.16 yes Fig.14 Example of lens data for an optical system. Fig.16 , when the radius of curvature of each lens is expressed as an absolute value on the optical axis, the radius of curvature of the seventh surface S7 of the fourth lens 114 on the optical axis OA may be the largest among the lenses, and the radius of curvature of the ninth surface S9 of the fifth lens 115 or the twelfth surface S12 of the sixth lens 116 may be the smallest among the lenses. Preferably, the radius of curvature of the ninth surface S9 of the fifth lens 115 may be the smallest. The difference between the maximum radius of curvature and the minimum radius of curvature may be 10 times or more, for example, 10 times to 40 times. The radius of curvature of the third lens 113, which is an aspherical lens, may be smaller than the radius of curvature of the first lens 111, the second lens 112, and the fourth lens 114 made of glass. Here, the radius of curvature is the average of the absolute values ​​of the radius of curvature of the object side surface and the sensor side surface of each lens. When expressed as an absolute value, the curvature radius of the first lens 111 arranged on the object side of the aperture stop ST on the optical axis may be larger than the curvature radius of the second lens 112 arranged on the sensor side of the aperture stop ST.

[0217] When expressed as an absolute value, the radius of curvature of the seventh lens 117 on the optical axis may be greater than the radius of curvature of the sixth lens 116. The radius of curvature of the seventh lens 117 may be greater than the radius of curvature of the fifth lens 115 and the sixth lens 116. When expressed as an absolute value, the difference in radius of curvature between the object-side surface and the sensor-side surface of the seventh lens 117 may be greater than the difference in radius of curvature between the object-side surface and the sensor-side surface of the sixth lens 116, and may be greater than the difference in radius of curvature between the object-side surface and the sensor-side surface of the fifth lens 115.

[0218] If the third lens 113 is designed as an aspherical surface, it can satisfy thermal compensation and improve optical performance, but may not be as easy to assemble as a spherical lens, and due to the assemblability of the aspherical third lens 113, the optical characteristics of the lens arranged on the sensor side may be more affected than the third lens 113. If the third lens is a spherical lens, even if the optical characteristics of the third lens are affected, the radius of curvature of the third lens on the optical axis will not change significantly due to the spherical characteristics. The third lens 113 with an aspherical surface has a radius of curvature less than 35 mm and is designed to have a large effective diameter so that assembly can be easy. In addition, since the third lens 113 has a large radius of curvature on the optical axis, it has a gentle lens shape, so even if it is assembled slightly tilted from the optical axis, the impact on the sensor side lens may be minimal.

[0219] Among the first to fourth lenses 111 to 114, the first lens 111 having a spherical surface is arranged on the object side of the aperture stop ST and is the lens most sensitive to optical characteristics, so the curvature radius of the first lens 111 is larger than the curvature radius of the second and third lenses, and the thickness of the first lens 112 is set to be the thickest. Here, a sensitive lens refers to a lens that has a large influence on the optical system even if the assembly is slightly misaligned. Therefore, since the lens arranged on the object side of the aperture is most sensitive to assembly, the curvature radius of the lens adjacent to the aperture is designed to be the largest, and then the curvature radius of the first lens sensitive to assembly is increased.

[0220] Since the third lens 113 is provided with an aspherical surface, the curvature radius on the optical axis can be increased without increasing the radius of curvature, the difference in the radius of curvature between the object-side surface and the sensor-side surface will not increase significantly, thermal compensation can be performed with a glass material, the assembly performance can be improved with the effective diameter, and the influence on the optical characteristics can be reduced. The radius of curvature of the seventh lens 117 can be larger than the radius of curvature of the sixth lens 116 made of glass. Therefore, the seventh lens 117 can guide the light incident through the first lens to the sixth lens 111 to 116 to the entire area of the image sensor 300. When the radius of curvature of the seventh lens 117 is larger than the radius of curvature of the sixth lens 126, the assembly characteristics of the last aspherical lens can be improved, and the change in the optical characteristics can be minimized.

[0221] The radius of curvature of each lens surface of the first lens to the sixth lens 111 to 117 can satisfy the following conditions.

[0222] Condition 1: 0 < |L1R1 / L1R2| < 1, Condition 2: 0 < |L2R1 / L2R2| < 1

[0223] Condition 3: 0.5 < L3R1 / L3R2 < 1.2, Condition 4: 5 < |L4R1 / L4R2| < 20

[0224] Condition 5: 0.2 < |L5R1 / L5R2| < 1.2, Condition 6: 0.7 < |L6R1 / L6R2| < 1.5

[0225] Condition 7: 2 < |L7R1 / L7R2| < 7, Condition 8: 1 mm ≤ |L3R2 - L3R1| ≤ 10 mm

[0226] Condition 9: 30 mm < |L7R1| - L7R2

[0227] If the difference between the object-side curvature radius and the sensor-side curvature radius of the third lens 113 is set within the above range, the assembly performance of the third lens 113 with an aspherical surface can be improved, and the optical influence caused by the third lens 113 can be reduced.

[0228] Describing the thickness of the lens, the central thickness CT1 of the first lens 111 can be greater than the central thicknesses CT2 to CT7 of the second to seventh lenses 112 to 117, and can have the maximum thickness within the lens portion 100A. The central thickness CT4 of the fourth lens 114 can be less than the central thicknesses CT1 to CT5 of the first to fifth lenses 111 to 115, and preferably, can have the minimum thickness within the lens portion 100A. The aspherical lens can include the third lens 113 and the seventh lens 117. The central thickness CT1 of the first lens 111 can be greater than 100% of the central thickness CT56 of the cemented lens CL2, for example, within the range of 101% to 150%. The thickness of each lens can satisfy at least one of the following conditions.

[0229] Condition 1: 0.6 < CT1 / ET1 < 1.3, Condition 2: 1 < CT2 / ET2 < 2.7

[0230] Condition 3: 0.8 < CT3 / ET3 < 2, Condition 4: 0.8 < CT4 / ET4 < 2.5

[0231] Condition 5: 1.5 < CT5 / ET5 < 3.5, Condition 6: 0 < CT6 / ET6 < 1

[0232] Condition 7: 0.3 < CT7 / ET7 < 1.2, Condition 8: 0.8 < ∑CT / ∑ET < 1.2

[0233] Condition 9: 0.24 < CT1 / ∑CT < 0.44. In this way, the difference between the central thickness and the edge thickness of each lens can be set to be greater than 0.6 mm and less than 4 mm. This can prevent the difference between the central thickness and the edge thickness of each lens from increasing by arranging the aspherical lens in the third lens 113 and the seventh lens 117. In addition, the difference between the central thickness and the edge thickness of the third lens 113 can be set within the range of Condition 3.

[0234] In addition, the difference between the maximum central thickness and the minimum central thickness in the lens will refer to the description of the first embodiment. The maximum central thickness can be greater than the sum of the central thicknesses of two adjacent lenses.

[0235] The center distance CG3 between the third lens 113 and the fourth lens 114 is the center distance between an aspherical lens and a spherical lens, which is the largest within the lens portion 100A and greater than the center distance between spherical lenses. That is, the distance CG3 between the adjacent object-side aspherical lens and the sensor-side spherical lens can be the largest within the lens portion 100A and can be less than the center thickness of the cemented lens CL2, for example, 61% or less of the center thickness of the cemented lens CL2, for example, within the range of 41% to 61%. The center distance CG6 between the sixth lens 116 and the seventh lens 117 can be less than the center distance CG3 and is the second largest within the lens portion 100A. That is, the distance CG6 between the adjacent object-side spherical lens and the sensor-side aspherical lens can satisfy the following condition: CG6 < CT7 < CG3 < CT1.

[0236] The center thickness of each lens and the center distance between adjacent lenses can satisfy the following conditions (here, the distance within the cemented lens is not included).

[0237] Condition 1: 15 < CT1 / CG1 < 40, Condition 2: 0.4 < CG6 / CT7 < 1.5

[0238] Condition 3: 0.5 < CG3 / CT3 < 2, Condition 4: (CG6 / CT7) < (CG3 / CT3)

[0239] Condition 5: 0.2 < CG3 / ∑CG < 0.7, Condition 6: 2 < CT1 / CG3 < 3.2

[0240] By setting the maximum center thickness of the lens to be 2.1 times or greater than the maximum center distance between the lenses, for example, within the range of 2.1 times to 3 times, a camera device module applying an aspherical lens within the optical system can be provided without increasing the center distance compared to the center thickness of each lens. In Condition 3, since the aspherical third lens 113 is set to a meniscus shape protruding toward the object side, the distance between the third lens 114 and the fourth lens 115 can be set to be larger. Here, if the i-th center distance between two adjacent lenses is defined as CGi, and the center thickness of the i-th lens positioned closer to the object side than CGi is defined as CTi, the following conditions can be satisfied (here, the distance between the cemented lenses is not included). The ratio of CTi / CGi is the largest when i is 1 and the smallest when i is 3. The reason why the value of CTi / CGi is the smallest when i is 3 can be achieved by the third lens 113 made of an aspherical glass material.

[0241] If the optical axis distance from the center of the object-side surface of the first lens 111 to the surface of the image sensor 300 is TTL, the following conditions can be satisfied.

[0242] Condition 1: 0.15 < CT1 / TTL < 0.5

[0243] Preferably, Condition 1 can be satisfied as: 0.2 ≤ CT1 / TTL ≤ 0.3. Since the first lens 111 is a spherical lens made of glass material, the following optical system can be designed: It can achieve thermal compensation according to temperature changes through the thickness of the first lens 111 that satisfies Condition 1. That is to say, Condition 1 can be a characteristic that appears when the first lens 111 is designed as a spherical glass lens.

[0244] Condition 2: 0 < CT2 / TTL < 0.2, Condition 3: 0 < CT3 / TTL < 0.2

[0245] Condition 4: 0 < CT4 / TTL < 0.2, Condition 5: 0 < CT5 / TTL < 0.3

[0246] Condition 6: 0 < CT6 / TTL < 0.2, Condition 7: 0 < CT7 / TTL < 0.2

[0247] The CT1 / TTL ratio of Condition 1 can be greater than the values of Conditions 2 to 7.

[0248] In terms of the effective diameter, the lens with the largest effective diameter can be the third lens 113. The fifth surface S5 of the third lens 113 can be the lens surface with the largest effective diameter. The lens with the smallest effective diameter can be the lens closest to the image sensor 300, for example, the seventh lens 117. The third lens 113 with the largest effective diameter can be arranged between the second lens 112 and the fourth lens 114. The lens surface with the smallest effective diameter can be the thirteenth surface S13 of the seventh lens 117.

[0249] The effective diameter of each lens can satisfy the following conditions.

[0250] Condition 1: CA11 < CA21 < CA22, Condition 2: CA71 < CA72

[0251] Condition 3: CA32 < CA22 < CA31, Condition 4: (CA11 - CA12) < (CA61 - CA62)

[0252] Condition 5: CA71 < CA61 < CA51 < CA41, Condition 6: (2 * ImgH) < CA1 < CA2 <ca3>CA4, Condition 7: CA4 > CA5 > CA6 > (2 * ImgH) > CA7

[0253] As in Condition 1, even if the effective diameter of the first lens 111 is set to be smaller than that of the second lens 112, due to the spherical glass material and the thick thickness, thermal compensation can be more effective and assembly can be improved.

[0254] In terms of refractive index, at least one of the first lens 111 and the third lens 113 has the largest refractive index among the lenses, and preferably, the refractive index of the first lens 111 can be the largest and can be 1.72 or greater. The difference in refractive index between the first lens 111 and the third lens 113 is 0.10 or less. The refractive index of the fourth lens 114 is the smallest among the lenses. The difference between the largest refractive index and the smallest refractive index can be 0.20 or greater. By adjusting the refractive indices of the spherical lens and the aspherical lens, the incident efficiency can be improved and the incident light can be guided to the image sensor 300.

[0255] In terms of Abbe number, the Abbe number of the fourth lens 114 is the largest among the lenses and can be 65 or greater. The Abbe number of the first lens 111 is the smallest among the lenses. The difference between the largest refractive index and the smallest Abbe number can be 30 or greater. By making the Abbe number of the object-side lens based on the aperture stop ST smaller, the Abbe number of the sensor-side lens based on the aperture stop ST larger, and setting the Abbe number of the aspherical seventh lens 117 closest to the image sensor 300 to be small, the dispersion of the light traveling between the lenses made of glass can be controlled, and the dispersion between the spherical lens and the aspherical lens can be increased and guided to the image sensor 300.

[0256] If the average effective diameter of the spherical lens is GL_CA_Aver and the average effective diameter of the aspherical lens is GM_CA_Aver, the following condition can be satisfied: GM_CA_Aver < GL_CA_Aver.

[0257] If the average value of the center thickness of the spherical lens is GL_CT_Aver and the average value of the center thickness of the aspherical lens is GM_CT_Aver, the following condition can be satisfied: GM_CT_Aver < GL_CT_Aver. The average refractive index of the spherical lens is GL_nd_Aver and the average refractive index of the aspherical lens is GM_nd_Aver, such that the following condition can be satisfied: GL_nd_Aver < GM_nd_Aver. The average Abbe number of the spherical lens is GL_Ad_Aver and the average Abbe number of the aspherical lens is GM_Ad_Aver, such that the following condition can be satisfied: GM_Ad_Aver < GL_Ad_Aver.

[0258] The focal length F1 of the first lens 111, the focal length F6 of the sixth lens 116, and the focal length F7 of the seventh lens 117 have negative refractive power, and the focal length F2 of the second lens 112, the focal length F3 of the third lens 113, the focal length F4 of the fourth lens 114, and the focal length F5 of the fifth lens 115 may have positive refractive power. In addition, the fifth lens 115 and the sixth lens 116, which are adjacently arranged lenses, may satisfy the following conditions.

[0259] Condition 1: The refractive index of the lens with positive refractive power < the refractive index of the lens with negative refractive power

[0260] Condition 2: Dispersion of a lens with positive refractive power > dispersion of a lens with negative refractive power

[0261] Here, the fifth lens 115 has positive refractive power, and the sixth lens 116 has negative refractive power, and as in conditions 1 and 2, the refractive index of the fifth lens 115 is smaller than the refractive index of the sixth lens 116, and the dispersion value of the fifth lens 115 is larger than the dispersion value of the sixth lens 116. Therefore, the chromatic aberration occurring in the spherical lens can be corrected with an aspherical lens. In addition, by satisfying that the refractive index difference of the fifth lens 115 and the sixth lens 116 arranged in sequence is 0.01 or more and 0.15 or less, and the Abbe number difference is 20 or more and 60 or less, the chromatic aberration occurring in the spherical lens can be compensated with a cemented lens. Here, the refractive index difference is rounded to the third decimal place, and the Abbe number difference is rounded to the first decimal place, so as to compare these values.

[0262] The optical system 1000 generates chromatic aberration, and corrects the chromatic aberration by using a cemented lens CL2 or two lenses arranged in series. The lens repeatedly contracts and expands as the temperature changes from low to high. Since the lens characteristics of lenses of the same material change by the same amount according to temperature changes, it is effective to correct the chromatic aberration between lenses of the same material even in the case of temperature changes. The chromatic aberration occurring in the spherical lens can be corrected by using the third lens 113 and the seventh lens 117, and the chromatic aberration between the spherical lens and the aspherical lens can be mutually corrected by using the sixth lens 116 and the seventh lens 117. By arranging a glass lens with a relatively high Abbe number at the fifth lens 115 of the cemented lens CL2 arranged on the object side of the aspherical seventh lens 117, dispersion can be reduced by the glass lens, and dispersion can be increased by the aspherical lens.

[0263] When the focal length is expressed as an absolute value, the focal length of the third lens 113 is the largest among the lenses and may be 60 or more. The focal length of the sixth lens 116 is the smallest among the lenses. The difference between the maximum focal length and the minimum focal length may be 35 or more. By maximizing the focal length of the aspheric third lens 113 on the object side and setting the focal length of the sixth lens 116 adjacent to the last aspheric lens to be the smallest, the optical system may have improved MTF characteristics, aberration control characteristics, resolution characteristics, etc. within a set field of view range, and may have good optical performance in the periphery of the field of view.

[0264] like Fig.15 As shown in , in the absolute value of the sag value, the maximum value of Sag51 can be greater than the maximum value among Sag52, Sag62, Sag71 and Sag72. Fig.17 As shown in , the lens surfaces of the third lens 113 and the seventh lens 117 among the lenses of the lens portion 100A may include aspherical surfaces having a 30th order aspherical coefficient. For example, the third lens 113 and the seventh lens 117 may include lens surfaces having a 30th order aspherical coefficient. Fig.18 As shown in , the thickness T1 to T7 of each lens in the Y-axis direction can be expressed at intervals of 0.1 mm or 0.2 mm or larger, and the distances G1 to G6 between each lens can be expressed at intervals of 0.1 mm or 0.2 mm or larger. The center thickness CT56 of the cemented lens CL2 can be greater than the edge thickness ET56. The center thickness CT56 of the cemented lens CL2 is the distance from the center of the ninth surface S9 on the object side of the fifth lens 115 to the center of the twelfth surface S12 of the sixth lens 116, and the edge thickness ET56 is the distance from the end of the effective area of ​​the ninth surface S9 to the twelfth surface S12 in the optical axis direction. The maximum thickness of the cemented lens CL2 is the center, the minimum thickness is the edge, and the maximum thickness can be at least 1 times the minimum thickness, for example, in the range of 1 times to 1.5 times. The cemented lens CL2 can satisfy the following conditions: 0mm <CT56-ET56<2mm。

[0265] like Fig.19 As shown in Fig.14 The CRA of the optical system and camera module may be 10 degrees or greater, for example, in the range of 10 degrees to 35 degrees or in the range of 10 degrees to 25 degrees. Fig.33 As shown in, in the table showing the relative illumination from the center of the image sensor to the image height (i.e., from 0 mm to 4.630 mm) in the optical system according to the second embodiment, it can be seen that the relative illumination from the center of the image sensor to the diagonal end is 70% or more, for example, 75% or more. That is, it can be seen that the difference in relative illumination according to low temperature, room temperature, and high temperature is almost the same up to 4.399 mm from the optical axis.

[0266] Figure 20 to Figure 22 It is shown Fig.14 Graphs of diffraction MTF at room temperature, low temperature, and high temperature in an optical system of FIG. 1 and FIG. 2 are graphs showing modulation according to spatial frequency. Figure 20 to Figure 22 As shown in , the deviation of the MTF at low or high temperature based on room temperature may be less than 10%, ie, 7% or less.

[0267] Figure 23 to Figure 25 It is shown Fig.14 The aberration characteristics of the optical system at room temperature, low temperature and high temperature are plotted. Figure 23 to Figure 25 In the aberration graph of , spherical aberration (longitudinal spherical aberration), astigmatism field curve and distortion are measured from left to right. Figure 23 to Figure 25 In , the X-axis may represent the focal length (mm) and the degree of distortion (%), and the Y-axis may represent the height of the image. In addition, the graph of spherical aberration is a graph of light in the wavelength bands of about 435nm, about 486nm, about 546nm, about 587nm, and about 656nm, and the graph of astigmatism and distortion is a graph of light in the wavelength band of about 546nm. Figure 23 to Figure 25 , it can be understood that the aberration correction function is better when each curve at room temperature, low temperature, and high temperature is close to the Y-axis, and it can be seen that according to the optical system 1000 of the embodiment, the measured value is adjacent to the Y-axis in almost all areas. That is, the optical system 1000 according to the embodiment has improved resolution and can have good optical performance not only in the central part of the FOV but also in the peripheral part. Here, the low temperature is -20 degrees or less, for example, -20 degrees to -40 degrees, the room temperature is 22 degrees ±5 degrees or 18 degrees to 27 degrees, and the high temperature can be 85 degrees or more, for example, 85 degrees to 105 degrees. Therefore, it can be seen that Figure 23 to Figure 25 The decrease in brightness ratio (modulation) from low temperature to high temperature is less than 10%, for example, 5% or less, or is almost unchanged.

[0268] Table 2 compares the changes in optical properties (such as EFL, BFL, F number, TTL and FOV) at room temperature, low temperature and high temperature in the optical system according to the embodiment, and it can be seen that the rate of change of the optical properties at low temperature is 5% or less, for example, 3% or less, based on room temperature, and it can be seen that the rate of change of the optical properties at low temperature is 5% or less, for example, 3% and less, based on room temperature.

[0269] [Table 2]

[0270] Room temperature Low temperature high temperature Low temperature / room temperature High temperature / room temperature EFL(F) 15.2 15.1 15.2 99.91％ 100.12％ BFL 3.3 3.3 3.3 99.88％ 100.15％ F# 1.6 1.6 1.6 99.91％ 100.13％ TTL 36.5 36.5 36.5 99.92％ 100.09％ FOV 34.3 34.3 34.2 100.10％ 99.88％

[0271] Therefore, as shown in Table 2, it can be seen that the change in optical characteristics according to the temperature change from low temperature to high temperature, for example, the change rate of EFL, TTL, BFL, F number and diagonal FOV is 10% or less, that is, 5% or less, for example, within the range of 0 to 5%.

[0272] Will refer to Figure 26 to Figure 32 An optical system according to a third embodiment of the present invention is described. In describing the third embodiment, configurations different from the first and second embodiments will be described, and the same configurations may include the descriptions of the first and second embodiments.

[0273] Reference Fig.26 and Fig. 27 , the lens part 100B of the optical system 1000 according to the third embodiment may include first to seventh lenses 121 to 127. The first lens 121 may be a first lens group LG1, and the second to seventh lenses 122, 123, 124, 125, 126, and 127 may be a second lens group LG2.

[0274] The first lens 121 may have a negative (-) refractive power on the optical axis OA. The first lens 121 may be made of glass or a glass non-molding material. The object-side first surface S1 of the first lens 121 may be concave on the optical axis, and the sensor-side second surface S2 may be convex. The thickness of the first lens 121 may be thicker than the thickness of the cemented lens CL3. The center thickness of the first lens 121 may be thicker than the center thickness of the cemented lens CL3. The edge thickness of the first lens 121 may be thicker than the edge thickness of the cemented lens CL3. Since the first surface S1 is concave and the second surface S2 is convex on the optical axis, the incident light may be refracted in a direction away from the optical axis, and the center distance between the first lens 121 and the second lens 122 may be reduced, and the effective diameter of the second lens 122 may be reduced.

[0275] The aperture stop ST may be arranged around the sensor-side surface of the first lens 121. Alternatively, the aperture stop ST may be arranged around the object-side surface or the sensor-side surface of the second lens 122, or around the object-side surface of the third lens 123.

[0276] The second lens 122 may have a positive (+) refractive power on the optical axis OA. The second lens 122 may be provided with a glass material. The object-side third surface S3 of the second lens 122 may be convex based on the optical axis OA, and the sensor-side fourth surface S4 may be convex. The third surface S3 and the fourth surface S4 may be spherical. The third lens 123 may have a positive (+) refractive power on the optical axis OA.

[0277] The third lens 123 may be provided with a glass material or a glass molded material. The object side fifth surface S5 of the third lens 123 may be convex based on the optical axis, and the sensor side sixth surface S6 may be concave. The third lens 123 may be provided with an aspherical lens made of glass. The fifth surface S5 and the sixth surface S6 may be aspherical, and the aspherical coefficient may be set to Fig.28 The effective diameter of the third lens 123 may have the largest effective diameter in the lens portion 100B. The effective diameter of the third lens 123 may have the largest effective diameter among the spherical lens and the aspherical lens.

[0278] The fourth lens 124 may have a positive (+) refractive power on the optical axis OA. The fourth lens 124 may be provided with a glass material. The object-side seventh surface S7 of the fourth lens 124 may be concave relative to the optical axis, and the sensor-side eighth surface S8 may be convex. The fourth lens 124 may be provided with a spherical lens made of glass.

[0279] The fifth lens 125 may have positive (+) refractive power on the optical axis OA. The fifth lens 125 may be provided with a glass material. Based on the optical axis OA, the object-side ninth surface S9 of the fifth lens 125 may be convex, and the sensor-side tenth surface S10 may be convex. The fifth lens 125 may be a spherical lens. The ninth surface S9 and the tenth surface S10 of the fifth lens 125 may be spherical.

[0280] The sixth lens 126 may have a negative (-) refractive power on the optical axis OA. The sixth lens 126 may be set to a glass material. Based on the optical axis OA, the object-side eleventh surface of the sixth lens 126 may be concave, and the sensor-side twelfth surface S12 may be concave. The sixth lens 126 may be spherical. For example, the eleventh surface and the twelfth surface S12 may be spherical. The eleventh surface of the sixth lens 126 may be set to have no critical point from the optical axis OA to the end of the effective area. The twelfth surface S12 may be set to have no critical point from the optical axis OA to the end of the effective area.

[0281] The fifth lens 125 and the sixth lens 126 may be bonded or joined and may be defined as a cemented lens CL3. The fifth lens 125 and the sixth lens 126 may have opposite refractive powers. The composite refractive power of the fifth lens 125 and the sixth lens 126 may have positive (+) refractive power. The product of the refractive power of the fifth lens 125 on the object side of the cemented lens CL3 and the refractive power or focal length of the sixth lens 126 on the sensor side may be less than 0. The composite refractive power of the cemented lens CL3 may have positive refractive power, and the fourth lens 124 arranged on the object side based on the cemented lens CL3 may have positive refractive power, and the seventh lens 127 arranged on the sensor side may have negative refractive power. Therefore, the fourth lens 124, the cemented lens CL3 and the seventh lens 127 may refract some of the incident light in the optical axis direction.

[0282] The effective diameter of the cemented lens CL3 may be greater than the diagonal length of the image sensor 300. The effective diameter of the fifth lens 125 may be an average of the effective diameters of the ninth surface S9 and the tenth surface S10, and the effective diameter of each of the ninth surface S9 and the tenth surface S10 may be greater than the diagonal length of the image sensor 300. The effective diameter of the sixth lens 126 may be smaller than the effective diameter of the fifth lens 125, and greater than the diagonal length of the image sensor 300. The effective diameter of the seventh surface S7 of the fourth lens 124 may be greater than the diagonal length of the image sensor 300, and the effective diameter of the twelfth surface S12 of the sixth lens 126 may be smaller than the diagonal length of the image sensor 300. The difference in effective diameter between the object-side eleventh surface and the sensor-side twelfth surface S12 of the sixth lens 126 may be the largest within the lens portion 100B. For example, the effective diameters of the ninth and tenth surfaces of the sixth lens 126 satisfy the following condition: CA61>CA62, and the difference between CA61 and CA62 may be the largest among the differences in effective diameters between the object-side surface and the sensor-side surface of each lens. Therefore, by maximizing the difference in effective diameters between the object-side surface and the sensor-side surface of the sixth lens 126, light can be guided to the effective area of ​​the aspheric lens having a relatively small effective diameter. Therefore, a thinner optical system can be provided. The effective diameter of the sixth lens 126 may satisfy the following condition: 1.10 <CA61 / CA62<1.50。

[0283] The seventh lens 127 may have a negative (-) refractive power on the optical axis OA. The seventh lens 127 may be made of glass or a glass molded material. The object side thirteenth surface S13 of the seventh lens 127 on the optical axis may be convex, and the sensor side fourteenth surface S14 may be concave. The seventh lens 127 may be made of glass and have aspherical surfaces on both sides. The above thirteenth surface S13 and the fourteenth surface S14 have aspherical surfaces, and the aspherical coefficient may be set to Fig.28 L7S1 and L7S2.

[0284] Fig. 27 yes Fig.26 Examples of lens data for an optical system of an embodiment of the present invention. Fig. 27 As shown in , when the radius of curvature of each lens on the optical axis is expressed as an absolute value, the radius of curvature of the seventh surface S7 of the fourth lens 124 on the optical axis OA may be the largest among the lenses, and the radius of curvature of the ninth surface S9 of the fifth lens 125 or the twelfth surface S12 of the sixth lens 126 may be the smallest among the lenses. Preferably, the radius of curvature of the ninth surface S9 of the fifth lens 125 may be the smallest. The difference between the maximum radius of curvature and the minimum radius of curvature may be 10 times or more, for example, 10 times to 50 times. The radius of curvature of the third lens 123, which is an aspherical lens, may be smaller than the radius of curvature of the first lens 121, the second lens 122, and the fourth lens 124 made of glass. Here, the radius of curvature is the average of the absolute values ​​of the radius of curvature of the object side surface and the sensor side surface of each lens. When expressed as an absolute value, the radius of curvature of the first lens 121 disposed on the object side of the aperture stop ST on the optical axis may be larger than the radius of curvature of the second lens 122 disposed on the sensor side of the aperture stop ST. When expressed as an absolute value, the radius of curvature of the seventh lens 127 on the optical axis may be greater than the radius of curvature of the sixth lens 126. The radius of curvature of the seventh lens 127 may be greater than the radius of curvature of the fifth lens 125 and the sixth lens 126. When expressed as an absolute value, the difference in radius of curvature between the object-side surface and the sensor-side surface of the seventh lens 127 may be greater than the difference in radius of curvature between the object-side surface and the sensor-side surface of the sixth lens 126, and may be greater than the difference in radius of curvature between the object-side surface and the sensor-side surface of the fifth lens 125.

[0285] The third lens 123 having an aspherical surface has a radius of curvature less than 35 mm, and the effective diameter is designed to be large so that it can be easily assembled. In addition, when the radius of curvature on the optical axis is large, the shape of the lens is gently formed so that even if it is assembled slightly tilted from the optical axis, the influence on the lens on the sensor side can be minimized. Among the first lens 121 to the fourth lens 124, the first lens 121 having a spherical surface is arranged on the object side of the aperture stop ST, and is the lens most sensitive to optical characteristics. Therefore, the radius of curvature of the first lens 121 is larger than the radius of curvature of the second lens 122 and the third lens 123, and the thickness of the first lens 122 is set to be the thickest.

[0286] Since the third lens 123 is set as an aspherical surface, the curvature radius on the optical axis does not increase, the difference in curvature radius between the object side surface and the sensor side surface does not increase significantly, thermal compensation can be performed by glass material, assemblability can be improved by effective diameter, and the influence on optical characteristics can be reduced. The curvature radius of the seventh lens 127 can be greater than the curvature radius of the sixth lens 126 made of glass.

[0287] The radius of curvature of the first lens 121 to the seventh lens 127 may satisfy the following conditions.

[0288] Condition 1: 0 < |L1R1 / L1R2| < 1, Condition 2: 0 < |L2R1 / L2R2| < 1

[0289] Condition 3: 0.5 < L3R1 / L3R2 < 1.2, Condition 4: 5 < |L4R1 / L4R2| < 20

[0290] Condition 5: 0.2 < |L5R1 / L5R2| < 1.2, Condition 6: 0.7 < |L6R1 / L6R2| < 1.5

[0291] Condition 7: 2 < |L7R1 / L7R2| < 7, Condition 8: 1 mm ≤ |L3R2 - L3R1| ≤ 10 mm

[0292] Condition 9: 30 mm < |L7R1| - L7R2

[0293] If the difference between the object-side radius of curvature and the sensor-side radius of curvature of the third lens 123 is set within the above range, the assembly performance of the third lens 123 with an aspherical surface can be improved, and the optical influence caused by the third lens 123 can be reduced.

[0294] The central thickness CT1 of the first lens 121 may be greater than 100% of the central thickness CT56 of the cemented lens CL3, and may be in the range of, for example, 101% to 150%. The thickness of the first lens 121 to the seventh lens 127 may satisfy the following conditions.

[0295] Condition 1: 0.6 < CT1 / ET1 < 1.3, Condition 2: 1 < CT2 / ET2 < 2.7

[0296] Condition 3: 0.8 < CT3 / ET3 < 2, Condition 4: 0.8 < CT4 / ET4 < 2.5

[0297] Condition 5: 1.5 < CT5 / ET5 < 3.5, Condition 6: 0 < CT6 / ET6 < 1

[0298] Condition 7: 0.3 < CT7 / ET7 < 1.2, Condition 8: 0.8 < ∑CT / ∑ET < 1.2

[0299] Condition 9: 0.24 < CT1 / ∑CT < 0.44

[0300] In addition, the maximum central thickness may be greater than the sum of the central thicknesses of two adjacent lenses.

[0301] The center distance CG3 between the third lens 123 and the fourth lens 124 is the center distance between an aspherical lens and a spherical lens, which is the largest within the lens unit 100B and greater than the center distance between spherical lenses. It can be less than the center thickness of the cemented lens CL3, for example, 61% or less of the center thickness of the cemented lens CL3, for example, within the range of 41% to 61%. The following condition can be satisfied: CG6 < CT7 < CG3 < CT1.

[0302] The distances between the first lens 121 to the seventh lens 127 can satisfy the following conditions (here, the distances within the cemented lenses are not included).

[0303] Condition 1: 15 < CT1 / CG1 < 40, Condition 2: 0.4 < CG6 / CT7 < 1.5

[0304] Condition 3: 0.5 < CG3 / CT3 < 2, Condition 4: (CG6 / CT7) < (CG3 / CT3)

[0305] Condition 5: 0.2 < CG3 / ∑CG < 0.7, Condition 6: 2 < CT1 / CG3 < 3.2

[0306] By setting the maximum center thickness between the lenses to be 2.1 times or more of the maximum center distance, for example, within the range of 2.1 times to 3 times, an imaging device module applying an aspherical lens within an optical system can be provided without increasing the center distance compared to the center thickness of each lens. In Condition 3, since the aspherical third lens 123 is set to a meniscus shape convex toward the object side, the distance between the third lens 124 and the fourth lens 125 can be set larger.

[0307] Here, if the i-th center distance between two adjacent lenses is defined as CGi, and the center thickness of the i-th lens positioned closer to the object than CGi is defined as CTi, the following conditions can be satisfied (here, the distances between cemented lenses are not included). When i is 1, the ratio of CTi / CGi can be the largest, and when i is 3, the ratio of CTi / CGi can be the smallest. The reason why the value of CTi / CGi is the smallest when i is 3 can be achieved by the third lens 123 made of an aspherical glass material.

[0308] In terms of effective diameter, the lens having the largest effective diameter may be the third lens 123. The fifth surface S5 of the third lens 123 may be the lens surface having the largest effective diameter. The lens having the smallest effective diameter may be the lens closest to the image sensor 300, for example, the seventh lens 127. The lens surface having the smallest effective diameter may be the thirteenth surface S13 of the seventh lens 127. The relationship between CT1 to CT7 and TTL, and the effective diameters of the first to seventh lenses 121 to 127, the refractive indices of the first to seventh lenses 121 to 127, and the Abbe numbers will refer to the description of the second embodiment.

[0309] The focal length F1 of the first lens 121, the focal length F6 of the sixth lens 126, and the focal length F7 of the seventh lens 127 may have negative refractive power, and the focal length F2 of the second lens 122, the focal length F3 of the third lens 123, the focal length F4 of the fourth lens 124, and the focal length F5 of the fifth lens 125 may have positive refractive power. By satisfying that the refractive index difference of the fifth lens 125 and the sixth lens 126, which are sequentially arranged, is 0.01 or more and 0.15 or less and the Abbe number difference is 20 or more and 60 or less, chromatic aberration occurring in a spherical lens can be compensated by a cemented lens.

[0310] The third lens 123 and the seventh lens 127 may be used as aspherical lenses to correct chromatic aberration occurring in the spherical lens, and the sixth lens 126 and the seventh lens 127 may be used to mutually correct chromatic aberration between the spherical lens and the aspherical lens. By arranging a glass lens having a relatively high Abbe number at the fifth lens 125 of the cemented lens CL3 arranged on the object side of the aspherical seventh lens 127, dispersion can be reduced by the glass lens, and dispersion can be increased by the aspherical lens.

[0311] When the focal length is expressed as an absolute value, the focal length of the third lens 123 is the largest among the lenses and can be 70 or more. The focal length of the sixth lens 126 is the smallest among the lenses. The difference between the maximum focal length and the minimum focal length can be 45 or more. By maximizing the focal length of the aspherical third lens 123 on the object side and setting the focal length of the sixth lens 126 adjacent to the last aspherical lens to the minimum, the optical system can have improved MTF characteristics, aberration control characteristics, resolution characteristics, etc. within a set FOV range, and can have good optical performance in the peripheral part of the FOV.

[0312] The object side surface of the seventh lens 127 has a critical point. The critical point is a point at which the trend of the sag value changes. That is, a point at which the sag value increases and then decreases, or a point at which the sag value decreases and then increases. It can be seen that the object side surface of the seventh lens 127 has a critical point between a point of 1.6 mm and a point of 2.4 mm in a direction perpendicular to the optical axis based on the optical axis. For example, the sag value of the object side surface of the seventh lens 127 increases in a direction perpendicular to the optical axis until the critical point, and then decreases toward the edge after the critical point. If the critical point exists on the object surface of the seventh lens 127, the TTL can be reduced, which contributes to the miniaturization and lightweight of the optical system. As another example, the sensor side surface of the seventh lens 127 may have a critical point. In contrast, the object side surface and the sensor side surface of the seventh lens 127 may be set to have no critical point. When expressed as an absolute value of the sag value, the maximum value of Sag51 may be greater than the maximum values ​​of Sag52, Sag62, Sag71, and Sag72.

[0313] like Fig.28 As shown in , the lens surfaces of the third lens 123 and the seventh lens 127 among the lenses of the lens portion 100B may include aspherical surfaces having a 30th order aspherical coefficient. For example, the third lens 123 and the seventh lens 127 may include lens surfaces having a 30th order aspherical coefficient. Fig.29 As shown in , the thickness T1 to T7 of each lens in the Y-axis direction can be expressed at intervals of 0.1 mm or 0.2 mm or more, and the distances G1 to G6 between each lens can be expressed at intervals of 0.1 mm or 0.2 mm or more. The relationship between the thickness of each lens, the distance between adjacent lenses, and the center thickness CT56 and the edge thickness ET56 of the cemented lens CL3 will be described with reference to the description of the second embodiment.

[0314] like Fig.30 As shown, Fig.26 The CRA of the optical system and camera module may be 10 degrees or greater, for example, in the range of 10 degrees to 35 degrees or 10 degrees to 25 degrees. Fig.33 As shown in, in the optical system according to the third embodiment, a table showing relative illumination or ambient light ratio from the center of the image sensor to the image height, that is, from 0 mm to 4.630 mm, shows that the relative illumination is 70% or more, for example, 75% or more, from the center of the image sensor to the diagonal end. That is, it can be seen that the difference in ambient illumination according to low temperature, room temperature, and high temperature is almost the same up to 4.399 mm from the optical axis.

[0315] Fig.31 It is shown Fig.26 FIG. 1 is a graph of the diffraction MTF of an optical system at room temperature, and is a graph showing modulation according to the spatial frequency. Fig.32 It is shown Fig.26 This is a graph showing the aberration characteristics of an optical system at room temperature. Fig.32 The aberration curve graph of spherical aberration (longitudinal spherical aberration), astigmatism field curve, and distortion are measured from left to right. The optical system 1000 according to the embodiment has improved resolution and can have good optical performance not only in the central part of the FOV but also in the peripheral part. Here, the low temperature is -20 degrees or lower, for example, in the range of -20 degrees to -40 degrees, the room temperature is in the range of 22 degrees ± 5 degrees or in the range of 18 degrees to 27 degrees, and the high temperature is 85 degrees or higher, for example, in the range of 85 degrees to 105 degrees. Therefore, it can be seen that Figure 23 to Figure 25 The decrease in modulation from low temperature to high temperature is less than 10%, for example 5% or less, or almost unchanged. The optical system of the third embodiment disclosed above can effectively control aberration characteristics such as chromatic aberration and distortion aberration, and can have good optical performance not only in the central part of FOV but also in the peripheral part.

[0316] Will refer to Figures 34 to 45 A fourth embodiment of the present invention is described. When describing the fourth embodiment, the contents that are the same as or overlap with the first to third embodiments will refer to the description of the first to third embodiments, and may be included, replaced, or applied to the fourth embodiment. Figure 34 to Figure 36 , the lens part 100C of the optical system 1000 according to the fourth embodiment may include first to seventh lenses 131 to 137. The first lens 131 may be a first lens group LG1, and the second to seventh lenses 132, 133, 134, 135, 136, and 137 may be a second lens group LG2.

[0317] The first lens 131 may have a negative (-) refractive power on the optical axis OA. The first lens 131 may be made of glass or a glass non-molding material. The object-side first surface S1 of the first lens 131 on the optical axis may be concave, and the sensor-side second surface S2 may be convex. The thickness of the first lens 131 may be the thickest in the lens portion 100C. The thickness of the first lens 131 may be thicker than the thickness of the cemented lens CL4. The center thickness of the first lens 131 may be thicker than the center thickness of the cemented lens CL4. The edge thickness of the first lens 131 may be thicker than the edge thickness of the cemented lens CL4. The first surface S1 of the first lens 131 may be arranged to have no critical point from the optical axis OA to the end, i.e., the edge, of the effective area. The second surface S2 of the first lens 131 may be arranged to have no critical point.

[0318] The aperture stop ST may be arranged at the periphery of the sensor-side surface of the first lens 131. Since the aperture stop ST is arranged at the periphery between the first lens 131 and the second lens 132, the center distance between the first lens 131 and the second lens 132 may not increase, and the difference in effective diameter between the first lens 131 and the second lens 132 may be reduced.

[0319] The second lens 132 may have a positive (+) refractive power on the optical axis OA. The second lens 132 may be provided with a glass material. The object-side third surface S3 of the second lens 132 may be convex on the optical axis OA, and the sensor-side fourth surface S4 may be convex. The second lens 132 may be provided with a spherical lens made of glass. The third surface S3 and the fourth surface S4 may be spherical. At least one or both of the third surface S3 and the fourth surface S4 may be provided so that there is no critical point from the optical axis OA to the end of the effective area.

[0320] The third lens 133 may have a positive (+) refractive power on the optical axis OA. The third lens 133 may be provided with a glass material or a glass molded material. The object-side fifth surface S5 of the third lens 133 on the optical axis may be convex, and the sensor-side sixth surface S6 may be concave. The third lens 133 may be provided as a first aspherical lens made of glass. The fifth surface S5 and the sixth surface S6 may be aspherical, and the aspherical coefficient may be provided as Fig.37 L3S1 and L3S2.

[0321] The optical system 1000 may include at least one, for example, 1 to 3, glass lenses having an aspherical surface. The effective radius of the fifth surface S5 or the sixth surface S6 of the third lens 133 may be greater than the effective radius of the object side surface or the sensor side surface of the first lens 131 or the seventh lens 137. The effective diameter of the third lens 133 may have the second largest effective diameter in the lens portion 100C. The effective diameter of the third lens 133 may have the second largest effective diameter among spherical lenses and aspherical lenses. The difference between the effective diameter of the third lens 133 and the maximum effective diameter may be 2 mm or less, for example, 1.5 mm or less.

[0322] The fourth lens 134 may have a positive (+) refractive power on the optical axis OA. The fourth lens 134 may be provided with a glass material. The object-side seventh surface S7 of the fourth lens 134 on the optical axis may be convex, and the sensor-side eighth surface S8 may be convex. The fourth lens 134 may be provided as a spherical lens made of glass. The seventh surface S7 and the eighth surface S8 may be spherical.

[0323] The fifth lens 135 may have a positive (+) refractive power on the optical axis OA. The fifth lens 135 may be set as a glass material. The object side ninth surface S9 of the fifth lens 135 on the optical axis OA may be convex, and the sensor side tenth surface S10 may be convex. The fifth lens 135 may have a shape that is convex on both sides on the optical axis OA. The fifth lens 135 may be a spherical lens. The ninth surface S9 and the tenth surface S10 of the fifth lens 135 may be spherical.

[0324] The sixth lens 136 may have a negative (-) refractive power on the optical axis OA. The sixth lens 136 may be set with a glass material. With respect to the optical axis OA, the eleventh surface of the sixth lens 136 on the object side may be concave, and the twelfth surface S12 on the sensor side may be concave. The sixth lens 136 may be spherical. For example, the eleventh surface and the twelfth surface S12 may be spherical. The eleventh surface of the sixth lens 136 may be set to have no critical point from the optical axis OA to the end of the effective area.

[0325] The fifth lens 135 and the sixth lens 136 may be bonded or joined and may be defined as a cemented lens CL4. The bonding surface between the fifth lens 135 and the sixth lens 136 may be defined as a tenth surface S10. When the distance between the fifth lens 135 and the sixth lens 136 is G5, G5 may be less than 0.01 mm. The distance G5 between the fifth lens 135 and the sixth lens 136 may be less than 0.01 mm from the optical axis OA to the end of the effective area. The fifth lens 135 and the sixth lens 136 may have opposite refractive powers. The composite refractive power of the fifth lens 135 and the sixth lens 136 may have a positive (+) refractive power. The product of the refractive power of the object side fifth lens 135 of the cemented lens CL4 and the refractive power or focal length of the sensor side sixth lens 136 may be less than 0. Therefore, the aberration characteristics of the optical system may be improved. The composite refractive power of the cemented lens CL4 may have positive refractive power, and the fourth lens 134 arranged on the object side with respect to the cemented lens CL4 may have positive refractive power, and the seventh lens 137 arranged on the sensor side may have negative refractive power. Therefore, the fourth lens 134, the cemented lens CL4, and the seventh lens 137 may refract some incident light in the optical axis direction.

[0326] The difference in effective diameter between the eleventh surface on the object side and the twelfth surface S12 on the sensor side of the sixth lens 136 can be the largest among the lenses. For example, when the effective diameter of the ninth surface of the sixth lens 136 and the effective diameter of the twelfth surface S12 on the sensor side are CA61 and CA62, the following condition is satisfied: CA61>CA62, and the difference between CA61 and CA62 can be the largest among the differences in effective diameter between the object side surface and the sensor side surface of each lens. Therefore, by maximizing the difference in effective diameter between the object side surface and the sensor side surface of the sixth lens 136, light can be guided to the effective area of ​​the aspheric lens having a relatively small effective diameter. Therefore, a thinner optical system can be provided. The effective diameter of the sixth lens 136 can satisfy the following conditions: 1.10 <CA61 / CA62<1.50。

[0327] The effective diameter difference between the object side surface and the sensor side surface of the cemented lens CL4 may be greater than the effective diameter difference between the object side surface and the sensor side surface of each of the first to fourth lenses 131 to 134. The effective diameter difference between the object side surface and the sensor side surface of the cemented lens CL4 may be greater than the effective diameter difference between the object side surface and the sensor side surface of the sixth lens 136. By applying the cemented lens CL4 between the fourth lens 134 and the seventh lens 137, the effective diameter of the seventh lens 137 may be reduced, thereby improving assembly efficiency and reducing TTL.

[0328] The seventh lens 137 may have a negative (-) refractive power on the optical axis OA. The seventh lens 137 may be made of glass or a glass molded material. The object side thirteenth surface S13 of the seventh lens 137 on the optical axis may be concave, and the sensor side fourteenth surface S14 may be concave. The seventh lens 137 may be made of glass and have aspherical surfaces on both sides, and may be a second aspherical lens. The thirteenth surface S13 and the fourteenth surface S14 have aspherical surfaces, and the aspherical coefficient may be set to Fig.37 L7S1 and L7S2.

[0329] Reference Fig.35 , at least one of the thirteenth surface S13 and the fourteenth surface S14 of the seventh lens 137 may have a critical point. From the center of the fourteenth surface S14 to the edge of the sensor-side fourteenth surface S14, the distance between the center of the sensor-side fourteenth surface S14 of the seventh lens 137 and the straight line perpendicular to the center of the sensor-side surface of the seventh lens 137 may gradually increase and then decrease. The sensor-side surface of the seventh lens 147 has a critical point. The critical point of the sensor-side surface of the seventh lens 147 may be arranged between a point of 3.2 mm and a point of 4 mm in a direction perpendicular to the optical axis based on the optical axis. When expressed as an absolute value of a sag value, the maximum value of Sag51 may be greater than the maximum values ​​of Sag52, Sag62, Sag71, and Sag72.

[0330] Based on an axis parallel to the optical axis, the maximum tangent angle θ1 on the fourteenth surface S14 in the first direction X may be 40 degrees or less, for example, in a range of 5 to 40 degrees or in a range of 5 to 20 degrees. Based on an axis parallel to the optical axis, the maximum tangent angle on the thirteenth surface S13 in the first direction X may be 5 degrees or more, for example, in a range of 5 to 40 degrees or in a range of 5 to 30 degrees. The seventh lens 137 may have a small tilt angle between the thirteenth surface S13 and the fourteenth surface S14, and may have an effective diameter of 90% or more of the diagonal length of the image sensor 300, for example, in a range of 90% to 99%. Therefore, the light refracted from the seventh lens 137 may be refracted to the entire area of ​​the image sensor 300.

[0331] like Figure 34 to Figure 36 As shown in , when the radius of curvature of each lens is expressed as an absolute value on the optical axis, the radius of curvature of the third surface S3 of the second lens 132 on the optical axis OA may be the largest among the lenses, and the radius of curvature of the fifth surface S5 of the third lens 133, the ninth surface S9 of the fifth lens 135, or the twelfth surface S12 of the sixth lens 136 may be the smallest among the lenses. Preferably, the radius of curvature of the ninth surface S9 of the fifth lens 135 may be the smallest. The difference between the maximum radius of curvature and the minimum radius of curvature may be 5 times or more, for example, 5 times to 30 times. The radius of curvature of the third lens 133, which is an aspherical lens, may be smaller than the radius of curvature of the first lens 131, the second lens 132, and the fourth lens 134 made of glass. Here, the radius of curvature is the average of the absolute values ​​of the radius of curvature of the object side surface and the sensor side surface of each lens. When expressed as an absolute value, the radius of curvature of the first lens 131 disposed on the object side of the aperture stop ST on the optical axis may be smaller than the radius of curvature of the second lens 132 disposed on the sensor side of the aperture stop ST. When expressed as an absolute value, the radius of curvature of the seventh lens 137 on the optical axis may be larger than the radius of curvature of the sixth lens 136. The radius of curvature of the seventh lens 137 may be larger than the radii of curvature of the fifth lens 135 and the sixth lens 136.

[0332] When expressed as an absolute value, the difference in the radius of curvature between the object side surface and the sensor side surface of the seventh lens 137 can be greater than the difference in the radius of curvature between the object side surface and the sensor side surface of the sixth lens 136, and can be greater than the difference in the radius of curvature between the object side surface and the sensor side surface of the fifth lens 135.

[0333] If the third lens 133 is designed as an aspherical surface, it can satisfy thermal compensation and improve optical performance, but may not be as easy to assemble as a spherical lens, and due to the assemblability of the aspherical third lens 133, the optical characteristics of the lens arranged on the sensor side compared with the third lens 133 may be more affected. If the third lens is a spherical lens, even if the optical characteristics of the third lens are affected, the radius of curvature of the third lens on the optical axis will not change significantly due to the spherical characteristics. The present invention is designed so that the radius of curvature of the third lens 133 with an aspherical surface is less than 35 mm and the effective diameter is large, so that it can be easily assembled. In addition, when the radius of curvature is large on the optical axis, the shape of the lens is gently formed, so that even if it is assembled slightly tilted from the optical axis, the influence on the lens on the sensor side can be minimized.

[0334] In addition, among the first lens 131 to the fourth lens 134, the first lens 131 having a spherical surface is disposed on the object side of the aperture stop ST and is the lens most sensitive to optical characteristics. Therefore, the radius of curvature of the first lens 131 is made larger than the radius of curvature of the third lens, and the thickness of the first lens 132 is set to be as thick as possible. The radius of curvature of each lens may satisfy at least one of the following conditions.

[0335] Condition 1: 0 < |L1R1 / L1R2| < 1, Condition 2: 1 < |L2R1 / L2R2| < 5

[0336] Condition 3: 0.1 < L3R1 / L3R2 < 1.2, Condition 4: 0 < |L4R1 / L4R2| < 1

[0337] Condition 5: 0.1 < |L5R1 / L5R2| < 1.2, Condition 6: 1 < |L6R1 / L6R2| < 3

[0338] Condition 7: 2 < |L7R1 / L7R2| < 7, Condition 8: 3 mm ≤ |L3R2 - L3R1| ≤ 15 mm

[0339] Condition 9: 30 mm < |L7R1| - L7R2

[0340] When the difference between the object-side radius of curvature and the sensor-side radius of curvature of the third lens 133 is set within the above range, the assembly performance of the third lens 133 having an aspherical surface can be improved, and the optical influence caused by the third lens 133 can be reduced. In addition, if the absolute value of the radius of curvature of the object-side surface of the i-th lens is LiR1 and the absolute value of the radius of curvature of the sensor-side surface is LiR2, the value of LiR1 / LiR2 (i = 1 to 7) can be the smallest when i is 1 and the largest when i is 7.

[0341] In addition, the difference in the radius of curvature between adjacent spherical lens surfaces and aspherical lens surfaces may satisfy the following conditions.

[0342] Condition 10: 4 < |L2R2| / L3R1 < 7, Condition 11: 4 < |L7R1| / L6R2 < 7

[0343] The difference in the radius of curvature between the spherical lens surface and the aspherical lens surface is set to be 80 mm or less, for example, in the range of 10 mm to 80 mm, so that chromatic aberration caused by the aspherical lens surface can be corrected.

[0344] When describing the thickness of the lenses, the central thickness CT1 of the first lens 131 may be greater than the central thicknesses CT2 to CT7 of the second lens 132 to the seventh lens 137, and may have the maximum thickness within the lens portion 100C. The central thickness CT2 of the second lens 132 may be less than the central thicknesses CT3 to CT7 of the third lens 133 to the seventh lens 137, and may preferably have the minimum thickness within the lens portion 100C. The aspherical lenses may include the third lens 133 and the seventh lens 137. The central thickness CT1 of the first lens 131 may be greater than 100% of the central thickness CT56 of the cemented lens CL4, and may be, for example, in the range of 101% to 150%. The thickness of each lens may satisfy at least one of the following conditions.

[0345] Condition 1: 0.6 < CT1 / ET1 < 1.3, Condition 2: 1 < CT2 / ET2 < 2.7

[0346] Condition 3: 0.8 < CT3 / ET3 < 2, Condition 4: 1 < CT4 / ET4 < 5

[0347] Condition 5: 2 < CT5 / ET5 < 6 Condition 6: 0 < CT6 / ET6 < 1

[0348] Condition 7: 0.3 < CT7 / ET7 < 1.2, Condition 8: 0.8 < ∑CT / ∑ET < 1.2 or 1 < ∑CT / ∑ET < 1.2

[0349] Condition 9: 0.24 < CT1 / ∑CT < 0.44

[0350] In the conditions, when CTi / ETi (i = 1 to 7) exists, it may be the largest when i is 5 and the smallest when i is 6. This enables the design of a thin optical system by increasing the central thickness and the edge thickness of the cemented lens CL4. The difference between the central thickness and the edge thickness of each lens may be set to be greater than 0.6 mm and less than 4 mm. By arranging the aspherical lenses on the third lens 133 and the seventh lens 137, light can be effectively guided without increasing the difference between the central thickness and the edge thickness of each lens. In addition, by setting the difference between the central thickness and the edge thickness of the third lens 133 within the range of Condition 3, the difference in the radius of curvature between the object side surface and the sensor side surface can be designed not to be large, thereby improving the assemblability of the aspherical third lens 133 and reducing the influence on the optical characteristics.

[0351] In addition, the difference between the maximum center thickness and the minimum center thickness in the lens can be 3 mm or more, for example, within the range of 3 mm to 8 mm or 3 mm to 7.5 mm. That is, even if the center thickness of the final aspherical lens is set to be thin, the optical performance will not be reduced, and the thickness of the imaging device module can be set to be thin. In addition, since the difference between the center thickness and the edge thickness of each lens is not large, even if at least one lens is tilted, the influence on the optical characteristics can be reduced. In addition, the influence on the thermal characteristics between the center part and the edge part of the lens can be reduced. The maximum center thickness can be greater than the sum of the center thicknesses of two adjacent lenses.

[0352] The center distance CG3 between the third lens 133 and the fourth lens 134 is the center distance between the aspherical lens and the spherical lens, which is the largest within the lens part 100C and greater than the center distance between the spherical lenses. That is, the distance CG3 between the adjacent object-side aspherical lens and the sensor-side spherical lens can be the largest within the lens part 100C and can be less than the center thickness of the cemented lens CL4, for example, 68% or less of the center thickness of the cemented lens CL4, for example, within the range of 48% to 68%. The center distance CG6 between the sixth lens 136 and the seventh lens 137 can be less than the center distance CG3 and be the second largest within the lens part 100C. That is, the distance CG6 between the adjacent object-side spherical lens and the sensor-side aspherical lens can satisfy the following conditions: CT7 < CG6 < CG3 < CT1. The distance between the center thicknesses of each lens and the center distance between the adjacent lenses can satisfy the following conditions (here, the distance within the cemented lens is not included).

[0353] Condition 1: 10 < CT1 / CG1 < 30, Condition 2: 0.4 < CG6 / CT7 < 1.5

[0354] Condition 3: 0.5 < CG3 / CT3 < 2, Condition 4: (CG6 / CT6) < (CG3 / CT3)

[0355] Condition 5: 0.2 < CG3 / ∑CG < 0.7, Condition 6: 1.5 < CT1 / CG3 < 3.2

[0356] By setting the maximum center thickness between the lenses to be greater than 1.5 times the maximum center distance, for example, within the range of 1.8 times to 3 times, without increasing the center distance compared to the center thickness of each lens, an imaging device module applying an aspherical lens in the optical system can be provided. In Condition 3, since the aspherical third lens 133 is set to a convex meniscus shape facing the object side, the distance between the third lens 134 and the fourth lens 135 can be set to be large.

[0357] Here, if the i-th center distance between two adjacent lenses is defined as CGi, and the center thickness of the i-th lens positioned closer to the object side than CGi is defined as CTi, the following conditions can be satisfied (here, the distance between cemented lenses is not included). When i is 1, the ratio of CTi / CGi can be the largest, and when i is 3, the ratio of CTi / CGi can be the smallest. The reason why the value of CTi / CGi is the smallest when i is 3 can be achieved by the third lens 133 made of aspherical glass material.

[0358] If the optical axis distance from the center of the object-side surface of the first lens 131 to the surface of the image sensor 300 is TTL, the following conditions can be satisfied.

[0359] Condition 1: 0.10 < CT1 / TTL < 0.5

[0360] Preferably, Condition 1 can be satisfied: 0.15 ≤ CT1 / TTL ≤ 0.3. Since the first lens 131 is made of the glass material of a spherical lens, the following optical system can be designed: It can satisfy the thermal compensation according to the temperature change by the thickness of the first lens 131 that satisfies Condition 1. That is to say, Condition 1 can be a characteristic that appears by designing the first lens 131 as a spherical glass.

[0361] Condition 2: 0 < CT2 / TTL < 0.2, Condition 3: 0 < CT3 / TTL < 0.2

[0362] Condition 4: 0 < CT4 / TTL < 0.2, Condition 5: 0 < CT5 / TTL < 0.4

[0363] Condition 6: 0 < CT6 / TTL < 0.2, Condition 7: 0 < CT7 / TTL < 0.2

[0364] The ratio of CT1 / TTL of Condition 1 can be greater than the values of Conditions 2 to 7, and it can be the smallest when i is 2 in the ratio of CTi / TTL (i = 1 to 7).

[0365] Regarding the effective diameter, the lens with the largest effective diameter can be the fourth lens 134. The seventh surface S7 of the fourth lens 134 can be the lens surface with the largest effective diameter. The lens with the smallest effective diameter can be the lens closest to the image sensor 300, and it can be, for example, the seventh lens 137. The fourth lens 134 with the largest effective diameter can be arranged between the third lens 133 and the fifth lens 135, and can be disposed on the sensor side of the third spacing CG3 with the largest distance. The lens surface with the smallest effective diameter can be the thirteenth surface S13 of the seventh lens 137. That is to say, the object-side lens or the sensor-side lens forming the largest center distance can have the largest effective diameter.

[0366] The effective diameter of each lens can satisfy at least one of the following conditions.

[0367] Condition 1: CA21 < CA11 < CA22, Condition 2: CA71 < CA72 < CA62

[0368] Condition 3: CA32 < CA42 < CA41, Condition 4: (CA11 - CA12) < (CA61 – CA62)

[0369] Condition 5: (2 * ImgH) < CA1 < CA2 < CA3 < CA4, Condition 6: CA4 > CA5 > CA6 > (2 * ImgH) > CA7

[0370] As in Condition 1, even if the effective diameter of the first lens 131 is set to be smaller than that of the second lens 132, due to the spherical glass material and the thick thickness, thermal compensation can be more effective, and assemblability can be improved.

[0371] In terms of refractive index, at least one of the first lens 131 and the third lens 133 has the largest refractive index among the lenses, and preferably, the refractive index of the first lens 131 can be the largest and can be 1.72 or greater. The difference in refractive index between the first lens 131 and the third lens 133 is 0.10 or less. The refractive index of the fourth lens 134 is the smallest among the lenses. The difference between the largest refractive index and the smallest refractive index can be 0.15 or greater. By adjusting the refractive indices of the spherical lens and the aspherical lens, the incident efficiency can be improved, and the incident light can be guided to the image sensor 300.

[0372] In terms of Abbe number, the Abbe number of the fourth lens 134 is the largest among the lenses and can be 65 or greater. The Abbe number of the first lens 131 is the smallest among the lenses. The difference between the largest refractive index and the smallest Abbe number can be 30 or greater. By making the Abbe number of the object-side lens based on the aperture stop ST smaller, making the Abbe number of the sensor-side lens based on the aperture stop ST larger, and setting the Abbe number of the aspherical seventh lens 137 closest to the image sensor 300 to be small, the dispersion of the light traveling between the lenses made of glass can be controlled, and the dispersion between the spherical lens and the aspherical lens can be increased and guided to the image sensor 300.

[0373] If the average effective diameter of the spherical lens is GL_CA_Aver and the average effective diameter of the aspherical lens is GM_CA_Aver, the following condition can be satisfied: GM_CA_Aver < GL_CA_Aver. If the average center thickness of the spherical lens is GL_CT_Aver and the average center thickness of the aspherical lens is GM_CT_Aver, the following condition can be satisfied: GM_CT_Aver < GL_CT_Aver. If the average refractive index of the spherical lens is GL_nd_Aver and the average refractive index of the aspherical lens is GM_nd_Aver, the following condition can be satisfied: GL_nd_Aver < GM_nd_Aver. If the average Abbe number of the spherical lens is GL_Ad_Aver and the average Abbe number of the aspherical lens is GM_Ad_Aver, the following condition can be satisfied: GM_Ad_Aver < GL_Ad_Aver.

[0374] The focal length F1 of the first lens 131, the focal length F6 of the sixth lens 136, and the focal length F7 of the seventh lens 137 can have negative refractive powers, and the focal length F2 of the second lens 132, the focal length F3 of the third lens 133, the focal length F4 of the fourth lens 134, and the focal length F5 of the fifth lens 135 can have positive refractive powers. Additionally, the fifth lens 135 and the sixth lens 136, which are adjacent lenses, can satisfy the following conditions.

[0375] Condition 1: The refractive index of the lens with positive refractive power < the refractive index of the lens with negative refractive power

[0376] Condition 2: The dispersion of the lens with positive refractive power > the dispersion of the lens with negative refractive power

[0377] Here, the fifth lens 135 has positive refractive power and the sixth lens 136 has negative refractive power. As in Condition 1 and Condition 2, the refractive index of the fifth lens 135 is less than that of the sixth lens 136, and the dispersion value of the fifth lens 135 is greater than that of the sixth lens 136. Therefore, chromatic aberration occurring in the spherical lens can be corrected by the aspherical lens. Additionally, the refractive index difference between the fifth lens 135 and the sixth lens 136 arranged in sequence can satisfy being 0.01 or greater and 0.15 or less, and the Abbe number difference can satisfy being 20 or greater and 60 or less. The optical system 1000 generates chromatic aberration and corrects the chromatic aberration by using a cemented lens CL4 or two lenses arranged in series. As the temperature changes from low to high, the lens contracts and expands repeatedly. Since the lens characteristics of the same material change by the same amount according to temperature changes, correcting chromatic aberration between lenses of the same material is effective even under temperature changes.

[0378] In addition, chromatic aberration occurring in the spherical lens can be corrected by using the third lens 133 and the seventh lens 137, and chromatic aberration between the spherical lens and the aspherical lens can be mutually corrected by using the sixth lens 136 and the seventh lens 137. In addition, by arranging a glass lens having a relatively high Abbe number at the fifth lens 135 of the cemented lens CL4 provided on the object side of the aspherical seventh lens 137, dispersion can be reduced by the glass lens, and dispersion can be increased by the aspherical lens.

[0379] When the focal length is expressed as an absolute value, the focal length of the second lens 132 is the largest among the lenses and can be 60 or more. The focal length of the sixth lens 136 is the smallest among the lenses. The difference between the maximum focal length and the minimum focal length can be 35 or more. By setting the focal length of the second lens 133 adjacent to the aspheric lens to the maximum and setting the focal length of the sixth lens 136 adjacent to the last aspheric lens to the minimum, the optical system can have improved MTF characteristics, aberration control characteristics, resolution characteristics, etc. within a set FOV range, and can have good optical performance in the peripheral part of the FOV.

[0380] like Fig.37 As shown in , among the lenses of the lens portion 100C in the embodiment, the lens surfaces of the third lens 133 and the seventh lens 137 may include aspheric surfaces having a 30th order aspheric coefficient. For example, the third lens 133 and the seventh lens 137 may include lens surfaces having a 30th order aspheric coefficient. Fig.38 As shown in , the thickness of each lens T1 to T7 in the Y-axis direction may be expressed at intervals of 0.1 mm or 0.2 mm or more, and the intervals G1 to G6 between each lens may be expressed at intervals of 0.1 mm or 0.2 mm or more.

[0381] The center thickness CT56 of the cemented lens CL4 may be greater than the edge thickness ET56. The center thickness CT56 of the cemented lens CL4 is the distance from the center of the ninth surface S9 on the object side of the fifth lens 135 to the center of the twelfth surface S12 of the sixth lens 136, and the edge thickness ET56 is the distance from the end of the effective area of ​​the ninth surface S9 to the twelfth surface S12 in the optical axis direction. The maximum thickness of the cemented lens CL4 is located at the center, the minimum thickness is located at the edge, and the maximum thickness may be 1 or more times the minimum thickness, for example, 1 to 1.5 times. The cemented lens CL4 may satisfy the following conditions: 0 mm <CT56-ET56<2mm。

[0382] like Fig.39 As shown in Fig.34 In the optical system and camera module, the angle of the CRA may be 10 degrees or greater, for example, 10 degrees to 35 degrees or 10 degrees to 25 degrees. Fig.53 As shown in, in the optical system according to the fourth embodiment, the table showing the relative illumination or ambient light ratio from the center of the image sensor to the image height, that is, from 0 mm to 4.630 mm, shows that the ambient light ratio from the center of the image sensor to the diagonal end is 70% or more, for example, 75% or more. That is, it can be seen that the difference in ambient illumination according to low temperature, room temperature, and high temperature is almost the same up to 4.399 mm from the optical axis.

[0383] Figure 40 to Figure 42 It is shown Fig.34 Graphs of diffraction MTF at room temperature, low temperature, and high temperature in an optical system of FIG. 1 and FIG. 2 are graphs showing modulation according to spatial frequency. Figure 40 to Figure 42 As shown in , in an embodiment of the present invention, the deviation of the MTF based on room temperature relative to low temperature or high temperature may be less than 10%, ie, 7% or less.

[0384] Figure 43 to Figure 45 It is shown Fig.34 Curve diagram of aberration characteristics in an optical system at room temperature, low temperature, and high temperature. Figure 43 to Figure 45 The aberration curve graph of is a graph measuring spherical aberration (longitudinal spherical aberration), astigmatism field curve and distortion from left to right. Figure 43 to Figure 45 In , the X-axis may represent the focal length (mm) and the degree of distortion (%), and the Y-axis may represent the height of the image. In addition, the graph of spherical aberration is a graph of light in the wavelength bands of about 435nm, about 486nm, about 546nm, about 587nm, and about 656nm, and the graph of astigmatism and distortion aberration is a graph of light in the wavelength band of about 546nm. Figure 43 to Figure 45 In the aberration diagram, it can be understood that the closer the corresponding curves at room temperature, low temperature, and high temperature are to the Y-axis, the better the aberration correction function. It can be seen that in the optical system 1000 according to the embodiment, the measured values ​​are close to the Y-axis in almost all areas. That is, the optical system 1000 according to the embodiment has improved resolution and can have good optical performance not only in the central part of the FOV but also in the peripheral part. Here, the low temperature is -20 degrees or less, such as -20 to -40 degrees, the room temperature is 22 degrees ± 5 degrees or 18 degrees to 27 degrees, and the high temperature can be 85 degrees or more, such as 85 degrees to 105 degrees. Therefore, it can be seen that at Figure 43 to Figure 45 In the embodiment, the decrease in modulation from low temperature to high temperature is less than 10%, such as 5% or less, or almost unchanged.

[0385] Table 1 compares the changes in optical properties such as EFL, BFL, F number, TTL and FOV in the optical system according to the embodiment at room temperature, low temperature and high temperature, and it can be seen that the rate of change of the optical properties at low temperature is 5% or less, for example, 3% or less, based on room temperature, and it can be seen that the rate of change of the optical properties at low temperature is 5% or less, for example, 3% or less, based on room temperature.

[0386] [Table 3]

[0387] Room temperature Low temperature high temperature Low temperature / room temperature High temperature / room temperature EFL(F) 15.1 15.1 15.1 99.90％ 100.14％ BFL 3.04 3.04 3.04 99.88％ 100.14％ F# 1.6 1.6 1.6 99.89％ 100.14％ TTL 35.8 35.8 35.9 99.92％ 100.10％ FOV 34.2 34.3 34.2 100.11％ 99.86％

[0388] Therefore, as shown in Table 3, the change in optical characteristics according to the temperature change from low temperature to high temperature, such as the change rate of EFL, TTL, BFL, F number and diagonal FOV, is 10% or less, that is, 5% or less, for example, 0 to 5%. Even in the case of using at least one or two or more aspherical lenses, this design can perform temperature compensation on the aspherical lenses, thereby preventing the reliability of optical characteristics from being reduced. The optical system of the embodiment disclosed above can effectively control aberration characteristics such as chromatic aberration and distortion aberration, and can have good optical performance not only in the central part of FOV but also in the peripheral part.

[0389] Will refer to Figure 46 to Figure 6 2 describes an optical system according to a fifth embodiment of the present invention. In describing the fifth embodiment, a configuration different from the fourth embodiment will be described, and the same configuration will refer to the first to fourth embodiments.

[0390] Reference Fig.46 and Fig.47 , the lens part 100D of the optical system 1000 according to the fifth embodiment may include first to seventh lenses 141 to 147. The first lens 141 may be a first lens group LG1, and the second to seventh lenses 142, 143, 144, 145, 146, and 147 may be a second lens group LG2.

[0391] The first lens 141 may have a negative (-) refractive power on the optical axis OA. The first lens 141 may be made of glass or a glass non-molding material. The object-side first surface S1 of the first lens 141 on the optical axis may be concave, and the sensor-side second surface S2 may be convex. The first lens 141 may be set with a glass material having the thickest thickness, so that the rigidity may be prevented from being reduced due to external impact, and the optical performance may be kept constant when the temperature of the glass material changes to a low temperature or a high temperature. In addition, since a spherical surface is applied to the glass material, the refractive index of light does not change significantly even if the lens is designed to be thick.

[0392] The thickness of the first lens 141 may be thicker than the thickness of the cemented lens CL5. The center thickness of the first lens 141 may be thicker than the center thickness of the cemented lens CL5. The edge thickness of the first lens 141 may be thicker than the edge thickness of the cemented lens CL5. The aperture stop ST may be arranged at the periphery of the sensor-side surface of the first lens 141. Conversely, the aperture stop ST may be arranged around the object-side surface or the sensor-side surface of the second lens 142, or around the object-side surface of the third lens 143.

[0393] The second lens 142 may have a positive (+) refractive power on the optical axis OA. The second lens 142 may be provided with a glass material. The object-side third surface S3 of the second lens 142 may be convex on the optical axis OA, and the sensor-side fourth surface S4 may be convex. The second lens 142 may have a shape that is convex on both sides on the optical axis. The second lens 142 may be provided with a spherical lens made of glass. The third surface S3 and the fourth surface S4 may be spherical.

[0394] The third lens 143 may have a positive (+) refractive power on the optical axis OA. The third lens 143 may be provided with a glass material or a glass molded material. The object side fifth surface S5 of the third lens 143 on the optical axis may be convex, and the sensor side sixth surface S6 may be concave. The third lens 143 may be provided with an aspherical lens made of glass. The fifth surface S5 and the sixth surface S6 may be aspherical, and the aspherical coefficient may be set to Fig.48 L3S1 and L3S2.

[0395] The fourth lens 144 may have a positive (+) refractive power on the optical axis OA. The fourth lens 144 may be provided with a glass material. The object-side seventh surface S7 of the fourth lens 144 on the optical axis may be convex, and the sensor-side eighth surface S8 may be convex. The fourth lens 144 may be provided as a spherical lens made of glass. The effective diameter of the fourth lens 144 may have the largest effective diameter within the lens portion 100D. The effective diameter of the fourth lens 144 may have the largest effective diameter among the spherical lens and the aspherical lens.

[0396] The fifth lens 145 may have a positive (+) refractive power on the optical axis OA. The fifth lens 145 may be set as a glass material. The ninth surface S9 of the fifth lens 145 on the object side may be convex on the optical axis OA, and the tenth surface S10 on the sensor side may be convex. The fifth lens 145 may have a shape that is convex on both sides on the optical axis OA. The fifth lens 145 may be a spherical lens. The ninth surface S9 and the tenth surface S10 of the fifth lens 145 may be spherical. The sixth lens 146 may have a negative (+) refractive power on the optical axis OA. The sixth lens 146 may be set with a glass material. The eleventh surface of the sixth lens 146 on the object side on the optical axis OA may be concave, and the twelfth surface S12 on the sensor side may be concave.

[0397] The fifth lens 145 and the sixth lens 146 may be bonded or joined and may be defined as a cemented lens CL5. The fifth lens 145 and the sixth lens 146 may have opposite refractive powers. The composite refractive power of the fifth lens 145 and the sixth lens 146 may have positive refractive power. The product of the refractive power of the fifth lens 145 on the object side of the cemented lens CL5 and the refractive power or focal length of the sixth lens 146 on the sensor side may be less than 0. Therefore, the aberration characteristics of the optical system may be improved. If the signs of the refractive powers of the two lenses of the cemented lens CL5 are the same, the improvement of the aberration is limited.

[0398] The composite refractive power of the cemented lens CL5 may have a positive refractive power, and the fourth lens 144 disposed on the object side based on the cemented lens CL5 may have a positive refractive power, and the seventh lens 147 disposed on the sensor side may have a negative refractive power. Therefore, the fourth lens 144, the cemented lens CL5, and the seventh lens 147 may refract some incident light in the direction of the optical axis. The effective diameter of the above-mentioned cemented lens CL5 may be greater than the diagonal length of the image sensor 300. The effective diameter of the fifth lens 145 is an average of the effective diameter of the ninth surface S9 and the effective diameter of the tenth surface S10, and each of the effective diameters of the ninth surface S9 and the tenth surface S10 may be greater than the diagonal length of the image sensor 300. The effective diameter of the sixth lens 146 may be smaller than the effective diameter of the fifth lens 145 and greater than the diagonal length of the image sensor 300. The effective diameter of the seventh surface S7 of the fourth lens 144 may be greater than the diagonal length of the image sensor 300, and the effective diameter of the twelfth surface S12 of the sixth lens 146 may be smaller than the diagonal length of the image sensor 300. The difference in effective diameter between the object-side eleventh surface S12 and the sensor-side twelfth surface S12 of the sixth lens 146 can be the largest in the lens portion 100D. Therefore, the difference in effective diameter between the object-side surface and the sensor-side surface of the sixth lens 146 can be maximized, thereby guiding light to the effective area of ​​the aspheric lens having a relatively small effective diameter. Therefore, a thinner optical system can be provided. The effective diameter of the sixth lens 146 can satisfy the following conditions: 1.10 <CA61 / CA62<1.50。

[0399] The seventh lens 147 may have a negative (-) refractive power on the optical axis OA. The seventh lens 147 may be made of glass or a glass molded material. The thirteenth surface S13 of the seventh lens 147 on the object side may be concave on the optical axis, and the fourteenth surface S14 on the sensor side may be concave. The seventh lens 147 may have a shape that is concave on both sides on the optical axis. The seventh lens 147 may be made of glass and may have aspherical surfaces on both sides. The thirteenth surface S13 and the fourteenth surface S14 may have aspherical surfaces, and the aspherical coefficient may be set to Fig.48 L7S1 and L7S2.

[0400] Fig.47 yes Fig.46 Examples of lens data for an optical system of an embodiment of the present invention. Fig.47 As shown in , when the radius of curvature of each lens is expressed as an absolute value on the optical axis, the radius of curvature of the second surface S2 of the first lens 141 on the optical axis OA may be the largest among the lenses, and the radius of curvature of the ninth surface S9 of the fifth lens 145 or the twelfth surface S12 of the sixth lens 146 may be the smallest among the lenses. Preferably, the radius of curvature of the ninth surface S9 of the fifth lens 145 may be the smallest. The difference between the maximum radius of curvature and the minimum radius of curvature may be 5 times or more, for example, 5 times to 30 times. The radius of curvature of the third lens 143, which is an aspherical lens, may be smaller than the radius of curvature of the first lens 141, the second lens 142, and the fourth lens 144 made of glass. Here, the radius of curvature is the average of the absolute values ​​of the radius of curvature of the object side surface and the sensor side surface of each lens. When expressed as an absolute value, the radius of curvature of the first lens 141 arranged on the object side of the aperture stop ST on the optical axis may be larger than the radius of curvature of the second lens 142 arranged on the sensor side of the aperture stop ST.

[0401] When expressed as an absolute value, the radius of curvature of the seventh lens 147 on the optical axis may be greater than the radius of curvature of the sixth lens 146. The radius of curvature of the seventh lens 147 may be greater than the radius of curvature of the fifth lens 145 and the sixth lens 146. When expressed as an absolute value, the difference in radius of curvature between the object-side surface and the sensor-side surface of the seventh lens 147 may be greater than the difference in radius of curvature between the object-side surface and the sensor-side surface of the sixth lens 146, and may be greater than the difference in radius of curvature between the object-side surface and the sensor-side surface of the fifth lens 145.

[0402] The present invention is designed so that the radius of curvature of the third lens 143 having an aspherical surface is less than 35 mm and the effective diameter is large, so that it can be easily assembled, and further, when the radius of curvature on the optical axis is large, the shape of the lens is gently formed so that even if it is assembled slightly tilted from the optical axis, the influence on the lens on the sensor side can be minimized. In addition, among the first lens 141 to the fourth lens 144, the first lens 141 having a spherical surface is arranged on the object side of the aperture stop ST and is the lens most sensitive to optical characteristics, so the radius of curvature of the first lens 141 is larger than the radius of curvature of the second lens 142 and the third lens 143, and the thickness of the first lens 142 is set to be the thickest.

[0403] Since the third lens 143 is provided with an aspherical surface, the radius of curvature on the optical axis does not increase, the difference in the radius of curvature between the object-side surface and the sensor-side surface does not decrease significantly, thermal compensation can be performed with a glass material, assemblability can be improved by the effective diameter, and the influence on optical characteristics can be reduced. The radius of curvature of the object-side surface of the seventh lens 147 can be larger than the radius of curvature of the sensor-side surface of the sixth lens 146 made of glass. Therefore, the seventh lens 147 can guide the light incident through the first lens 141 to the sixth lens 146 to the entire area of the image sensor 300. When the radius of curvature of the seventh lens 147 is larger than the radius of curvature of the sixth lens 146, the assemblability of the last aspherical lens can be improved, and the change in optical characteristics can be minimized.

[0404] The radius of curvature of the first lens 141 to the seventh lens 147 can satisfy at least one of the following conditions.

[0405] Condition 1: 0 < |L1R1 / L1R2| < 1, Condition 2: 0.5 < |L2R1 / L2R2| < 3

[0406] Condition 3: 0.2 < L3R1 / L3R2 < 1.5, Condition 4: 0 < |L4R1 / L4R2| < 1

[0407] Condition 5: 0.2 < |L5R1 / L5R2| < 1.5, Condition 6: 0.8 < |L6R1 / L6R2| < 2

[0408] Condition 7: 2 < |L7R1 / L7R2| < 7, Condition 8: 1 mm ≤ |L3R2 - L3R1| ≤ 10 mm

[0409] Condition 9: 30 mm < |L7R1| - L7R2

[0410] If the difference between the object-side radius of curvature and the sensor-side radius of curvature of the third lens 143 is set within the above range, the assembly performance of the third lens 143 having an aspherical surface can be improved, and the optical influence caused by the third lens 143 can be reduced. Additionally, if the absolute value of the object-side radius of curvature of the i-th lens is LiR1 and the absolute value of the sensor-side radius of curvature is LiR2, the value of LiR1 / LiR2 (i = 1 to 7) can be the smallest when i is 1 and the largest when i is 7. The central thickness CT1 of the first lens 141 can be greater than 100% of the central thickness CT56 of the cemented lens CL5, and can be, for example, in the range of 101% to 150%. The central thicknesses CT1 to CT7 and the edge thicknesses ET1 to ET7 of the first lens 141 to the seventh lens 147, and the sum of the central thicknesses ∑CT and the sum of the edge thicknesses ∑ET can satisfy at least one of the following conditions.

[0411] Condition 1: 0.6 < CT1 / ET1 < 1.3, Condition 2: 1 < CT2 / ET2 < 2.7

[0412] Condition 3: 0.8 < CT3 / ET3 < 2, Condition 4: 1 < CT4 / ET4 < 5

[0413] Condition 5: 2 < CT5 / ET5 < 6, Condition 6: 0 < CT6 / ET6 < 1

[0414] Condition 7: 0.3 < CT7 / ET7 < 1.2, Condition 8: 0.8 < ∑CT / ∑ET < 1.2 or 1 < ∑CT / ∑ET < 1.2

[0415] Condition 9: 0.24 < CT1 / ∑CT < 0.44

[0416] Among the conditions, when CTi / ETi (i = 1 to 7) exists, it can be the largest when i is 5 and the smallest when i is 6. This can be used to design a thin optical system by increasing the center thickness and edge thickness of the cemented lens CL4. The maximum center thickness can be greater than the sum of the center thicknesses of two adjacent lenses. For example, the following conditions can be satisfied: (CT2 + CT3) < CT1, (CT3 + CT4) < CT1, (CT4 + CT5) < CT1, (CT5 + CT6) < CT1, and (CT6 + CT7) < CT1.

[0417] The center distance CG3 between the third lens 143 and the fourth lens 144 is the center distance between an aspherical lens and a spherical lens, which is the largest within the lens part 100D and greater than the center distance between spherical lenses. It can be less than the center thickness of the cemented lens CL5, for example, 63% or less of the center thickness of the cemented lens CL5, for example, within the range of 43% to 63%. The center distances CG1 to CG6 and the sum of the center distances ∑CG between the first lens 141 and the seventh lens 147 can satisfy the following conditions (here, the distances within the cemented lens are not included).

[0418] Condition 1: 10 < CT1 / CG1 < 30, Condition 2: 1 < CG6 / CT7 < 2

[0419] Condition 3: 0.5 < CG3 / CT3 < 2, Condition 4: (CG6 / CT6) < (CG3 / CT3)

[0420] Condition 5: 0.2 < CG3 / ∑CG < 0.7, Condition 6: 1.5 < CT1 / CG3 < 5

[0421] The maximum central thickness between the lenses is set to be greater than 1.5 times the maximum central distance, for example, within the range of 2 to 4 times, so that an imaging device module applying an aspherical lens in an optical system can be provided without increasing the central distance compared to the central thickness of each lens. In Condition 3, since the aspherical third lens 143 is set to a meniscus shape convex toward the object side, the distance between the third lens 144 and the fourth lens 145 can be set large.

[0422] Here, if the i-th central distance between two adjacent lenses is defined as CGi, and the central thickness of the i-th lens located closer to the object side than CGi is defined as CTi, the following conditions can be satisfied (here, the distance between cemented lenses and cemented lenses is not included). When i is 1, the ratio of CTi / CGi is the largest, and when i is 6, the ratio of CTi / CGi is the smallest. The reason why the value of CTi / CGi is the smallest when i is 6 can be achieved by the seventh lens 147 made of an aspherical glass material.

[0423] If the optical axis distance from the center of the object-side surface of the first lens 141 to the surface of the image sensor 300 is TTL, the relationship between CT1 to CT7 and TTL will refer to the description of the fourth embodiment. In the ratio of CTi / TTL (i = 1 to 7), it is the largest when i is 1 and the smallest when i is 2.

[0424] Regarding the effective diameter, the lens with the largest effective diameter can be the fourth lens 144. The seventh surface S7 of the fourth lens 144 can be the lens surface with the largest effective diameter. The lens with the smallest effective diameter can be the lens closest to the image sensor 300, such as the seventh lens 147. The lens surface with the smallest effective diameter can be the thirteenth surface S13 of the seventh lens 147. The effective diameters of the first lens 141 to the seventh lens 147 will be described with reference to the description of the fourth embodiment. The effective diameter of the sensor-side surface of the sixth lens 146 can be greater than the diagonal length of the image sensor 300.

[0425] Condition 1: CA71 < (2 * ImgH) < CA62, Condition 2: (2 * ImgH) < CA1 < CA2 < CA3 < CA4

[0426] Condition 3: CA4 > CA5 > CA6 > (2 * ImgH) > CA7

[0427] The focal length F1 of the first lens 141, the focal length F6 of the sixth lens 146, and the focal length F7 of the seventh lens 147 may have negative refractive power, and the focal length F2 of the second lens 142, the focal length F3 of the third lens 143, the focal length F4 of the fourth lens 144, and the focal length F5 of the fifth lens 145 may have positive refractive power. By satisfying that the refractive index difference of the fifth lens 145 and the sixth lens 146 arranged in sequence is 0.01 or more and 0.15 or less and the Abbe number difference is 20 or more and 60 or less, chromatic aberration generated in the spherical lens can be compensated by the cemented lens. By applying the third lens 143 and the seventh lens 147 as aspherical lenses, chromatic aberration occurring in the spherical lens can be corrected, and the sixth lens 146 and the seventh lens 147 can be used to mutually correct the chromatic aberration between the spherical lens and the aspherical lens. By arranging a glass lens having a relatively high Abbe number at the fifth lens 145 of the cemented lens CL5 provided on the object side of the aspherical seventh lens 147, dispersion can be reduced by the glass lens, and dispersion can be increased by the aspherical lens.

[0428] When the focal length is expressed as an absolute value, the focal length of the third lens 143 is the largest among the lenses and can be 42 or more. The focal length of the sixth lens 146 is the smallest among the lenses. The difference between the maximum focal length and the minimum focal length can be 20 or more. By maximizing the focal length of the object-side aspherical third lens 143 and setting the focal length of the sixth lens 146 adjacent to the last aspherical lens to the minimum, the optical system can have improved MTF characteristics, aberration control characteristics, resolution characteristics, etc. within a set FOV range, and can have good optical performance in the peripheral part of the FOV.

[0429] The sensor side surface of the seventh lens 147 has a critical point. It can be seen that there is a critical point between a point of 2.9 mm and a point of 3.7 mm in a direction perpendicular to the optical axis based on the center of the sensor side surface of the seventh lens 147. If a critical point exists on the object surface of the seventh lens 147, TTL can be reduced, making the optical system easy to miniaturize and lighten. As another example, the sensor side surface of the seventh lens 147 may have a critical point. Alternatively, the object side surface and the sensor side surface of the seventh lens 147 may be set to have no critical point. In terms of the absolute value of the Sag value, the maximum value of Sag51 may be greater than the maximum values ​​of Sag52, Sag62, Sag71, and Sag72.

[0430] like Fig.48 As shown in , among the lenses of the lens portion 100D in the embodiment, the lens surfaces of the third lens 143 and the seventh lens 147 may include an aspheric surface having a 30th order aspheric coefficient. For example, the third lens 143 and the seventh lens 147 may include a lens surface having a 30th order aspheric coefficient. As described above, since the aspheric surface having a 30th order aspheric coefficient (a value other than "0") can significantly change the aspheric shape of the peripheral portion, the optical performance of the peripheral portion of the FOV can be well compensated.

[0431] like Fig.49 As shown in , the thicknesses T1 to T7 of the first to seventh lenses 141, 142, 143, 144, 145, 146, and 147 and the distances G1 to G6 between two adjacent lenses may be set. Fig.38 As shown in , the thickness T1 to T7 of each lens in the Y-axis direction can be expressed at intervals of 0.1 mm or 0.2 mm or more, and the distances G1 to G6 between each lens can be expressed at intervals of 0.1 mm or 0.2 mm or more. The thickness of each lens and the distance between adjacent lenses should refer to the description of the fourth embodiment. In addition, the relationship between the center thickness CT56 and the edge thickness ET56 of the cemented lens CL5 should refer to the description of the fourth embodiment.

[0432] like Fig.50 As shown in Fig.46 The CRA of the optical system and camera module may be 10 degrees or greater, such as in the range of 10 degrees to 35 degrees or 10 to 25 degrees. Fig.53 As shown in, in the optical system according to the fifth embodiment, in the table showing the relative illuminance or ambient light ratio from the center of the image sensor to the image height, that is, from 0 mm to 4.630 mm, it can be seen that the ambient light ratio from the center of the image sensor to the diagonal end is 70% or more, for example, 75% or more. That is, it can be seen that the difference in ambient illuminance according to low temperature, room temperature, and high temperature is almost the same up to 4.399 mm from the optical axis.

[0433] Fig.51 It is shown Fig.46 is a graph of the diffraction MTF of the optical system at room temperature, and is a graph showing the modulation according to the spatial frequency. Fig.52 It is shown Fig.46 This is a graph showing the aberration characteristics of an optical system at room temperature. Fig.52 In the aberration curve diagram, the longitudinal spherical aberration (longitudinal spherical aberration), astigmatic field curve, and distortion are measured from left to right. The optical system 1000 according to the embodiment has improved resolution and can have good optical performance not only in the central part of the FOV but also in the peripheral part. Here, the low temperature is -20 degrees or lower, for example, in the range of -20 degrees to -40 degrees, the room temperature is in the range of 22 degrees ± 5 degrees or in the range of 18 degrees to 27 degrees, and the high temperature is 85 degrees or higher, for example, in the range of 85 degrees to 105 degrees. Therefore, it can be seen that Figure 43 to Figure 45 The reduction in modulation from low temperature to high temperature is less than 10%, for example, less than 5%, or almost unchanged.

[0434] The optical systems of the first to fifth embodiments disclosed above can effectively control aberration characteristics such as chromatic aberration and distortion aberration, and can have good optical performance not only in the central part of the FOV but also in the peripheral part.

[0435] The optical system 1000 according to the first to fifth embodiments disclosed above can satisfy at least one or two or more of the following equations. Therefore, the optical system 1000 according to the embodiment can have improved optical characteristics. For example, when the optical system 1000 satisfies at least one equation, the optical system 1000 can effectively control aberration characteristics such as chromatic aberration and distortion aberration, and can have good optical performance not only in the central part of the FOV but also in the peripheral part. In addition, the optical system 1000 can have improved resolution. In addition, the thickness of the lens described in the equation on the optical axis OA and the interval between adjacent lenses on the optical axis OA can refer to the above embodiments.

[0436] [Equation 1] 1 < CT1 / CT2 < 7

[0437] In Equation 1, CT1 represents the central thickness of the first lenses 101 to 141, and CT2 represents the thickness (mm) of the second lenses 102 to 142 on the optical axis OA. Equation 1 sets the difference in the central thickness of the first lens and the second lens, thereby improving the chromatic aberration of the optical system. In Equation 1, the first embodiment can satisfy: 3 < CT1 / CT2 < 4, the second and third embodiments can satisfy: 1 < CT1 / CT2 < 5 or 2 < CT1 / CT2 < 4, and the fourth embodiment can satisfy: 2 < CT1 / CT2 < 7 or 4 < CT1 / CT2 < 6. The central thicknesses of the first spherical lens 101 and the second spherical lens 102 can be set so that the optical performance of the central part and the peripheral part of the FOV can be improved.

[0438] [Equation 2] (CT7 * CA7) < (CT1 * CA1)

[0439] CT7 is the central thickness of the seventh lens 107 to 147, CA1 is the effective diameter of the first lens 101 to 141, and CA7 is the effective diameter of the seventh lens. The effective diameter is the average of the effective diameters of the object side surface and the sensor side surface of the first lens and the seventh lens. Preferably, the following conditions can be satisfied: CT7 < CT1 and CA7 < CA1. Preferably, the following conditions can be satisfied: 2 < (CT1 * CA1) / (CT7 * CA7) < 7. By setting the thickness and effective diameter of the first lens and the seventh lens, the optical system can improve spherical aberration. In addition, according to Equation 2, thermal compensation can be performed through the central thickness and effective diameter of the first lens 101 made of glass, and the influence on optical characteristics can be reduced.

[0440] [Equation 3] Po1 < 0

[0441] In Equation 3, Po1 represents the refractive power of the first lens 101 to 141, and for the performance of the optical system, it can be set to have a shorter effective focal length F compared to the TTL in the optical system. Therefore, TTL > F can be satisfied, and for example, TTL can be 1.5 times or more of the effective focal length F, for example, in the range of 1.5 times to 3 times.

[0442] [Equation 4] 1.7 < n3 < 2.2

[0443] n3 is the refractive index of the d line of the third lens 103 to 143. Equation 4 sets the refractive index of the third lens to be high so that it can control the factor that reduces the third aberration (Seidel aberration) affecting the optical system, and the aberration that may occur when the TTL becomes slightly longer can be reduced. Equation 4 can preferably satisfy 1.72 < n3 < 1.90. If it is designed below the lower limit of Equation 4, the aberration may be reduced to obtain performance, but the refractive power of the third lens 103 becomes weak, so that light cannot be collected efficiently, and the performance of the optical system may deteriorate. If it is designed above the upper limit of Equation 4, there is a disadvantage that it is difficult to obtain materials. In addition, if the refractive index of the third lens 103 is designed below the lower limit of Equation 4, in order to increase the refractive power of the fifth lens and the sixth lens, the curvature radii of the fifth lens and the sixth lens must be increased. In this case, lens manufacturing becomes more difficult, the lens defect rate increases, and the yield rate will decrease.

[0444] [Equation 4-1] 1.60 ≤ Aver(n1:n7) ≤ 1.70

[0445] In Equation 4-1, Aver(n1:n7) is the average value of the refractive index values of the d line of the first lens to the seventh lens. If the optical system 1000 according to the embodiment satisfies Equation 4-1, the optical system 1000 can set the resolution and suppress the influence on the TTL.

[0446] [Equation 4-2] 0.5 < GL_nd_Aver / GM_nd_Aver < 1.5

[0447] GL_nd_Aver is the average refractive index of the spherical lenses in the lens unit 100, and GM_nd_Aver is the average refractive index of the aspherical lenses. The fifth to seventh lenses with high refractive indices are positioned on the sensor side to increase chromatic dispersion. Preferably, Equation 4-2 can be satisfied: 0.7 < GL_nd_Aver / GM_nd_Aver < 1.

[0448] [Equation 5] 20 degrees < FOV_H < 40 degrees

[0449] In Equation 5, FOV_H represents the horizontal field of view and can set the range of the vehicle optical system. Equation 5 is preferably satisfied: 25 degrees ≤ FOV_H ≤ 35 degrees, or in the range of 30 degrees ± 3 degrees, and at this time, the sensor length in the horizontal direction can be based on 8.064 mm ± 0.5 mm. Additionally, if Equation 5 is satisfied, when the temperature changes from room temperature to high temperature, the change rates of the effective focal length and the field of view can be set to 5% or less, for example, 0 to 5%. Moreover, even if one or more aspherical lenses, such as two or more aspherical lenses, are used in combination with spherical lenses in the optical system 1000, deterioration of optical characteristics can be prevented by temperature compensation of the glass lenses.

[0450] [Equation 6] L1R1 < 0

[0451] L1R1 represents the radius of curvature of the first surface S1 of the first lenses 101 to 141 and can be set to be less than 0. If Equation 6 is satisfied, the shape of the optical system will be restricted. The object-side surfaces of the first lenses 101 to 141 are formed concavely so that surface damage can be prevented when they start to contact the external structure. Additionally, since the following condition is satisfied: L1R1 * L1R2 > 0, incident light can be refracted in a direction away from the optical axis. Therefore, this embodiment can reduce the center distance between the first lens and the second lens, and the effective diameter of the second lens 102 can be set to be larger than the effective diameter of the first lens.

[0452] [Equation 6-1] L3R1 > 0, L2R2 < 0

[0453] L3R1 is the radius of curvature of the object-side surface of the third lens 103 to 143, and L2R2 is the radius of curvature of the sensor-side surface of the second lens. Since the first lens 101 to 141 has a meniscus shape convex toward the sensor, light can be refracted to the edges of the second and third lenses having a large effective diameter. Since the first lens has a convex meniscus shape toward the sensor side, it can even refract to the edges of the second and third lenses having a large effective diameter, and the number of lenses can be reduced. In addition, since the following conditions are satisfied: L3R2 > L3R1 and |L4R1 < L4R2|, light can be adjusted so that the effective diameters of the fifth to seventh lenses do not become large, and the TTL can be reduced. If the following condition: L3R1 > L3R2, there are the following problems: aberration is generated between the object-side surface of the first lens and the second lens, or the effective diameter of the sensor-side lens increases, or the TTL increases. By setting the radii of curvature of the first lens, the second lens, and the fourth lens to be large, the influence of optical characteristics on incident light can be reduced.

[0454] [Equation 7] 0.8 < BFL / L7S2_max_sag to Sensor < 3

[0455] The BFL is the distance along the optical axis from the center of the sensor side surface of the last lens (i.e., the seventh lens) to the surface of the image sensor. The L7S2_max_sag to Sensor can be the distance from the maximum sag value of the seventh lens 107 to 147 in the optical axis direction to the image sensor 300. If the optical system satisfies Equation 7, the TTL can be reduced, and the conditions for manufacturing the imaging device module can be set. Additionally, the L7S2_max_sag to Sensor can set the space where the optical filter 500 and the cover glass 400 located between the image sensor 300 and the seventh lens can be placed. If the range of Equation 7 is less than the lower limit, the space for placing circuit structures such as the optical filter and the image sensor becomes more restricted, and the process of assembling circuit structures such as the filter and the image sensor into the optical system may become difficult. When the range of Equation 7 is greater than the upper limit, the process of assembling circuit structures such as the filter and the image sensor into the optical system is easy, but the TTL becomes longer, making it difficult to miniaturize the optical system. That is, Equation 7 can set the minimum distance between the image sensor 300 and the last lens, and preferably, it can satisfy the following condition: L7S2_max_sag to Sensor < BFL. Additionally, when the last lens has no point protruding more towards the image sensor direction than the center of the sensor side surface, the value of Equation 7 can be equal to the BFL (back focal length). The BFL is the distance along the optical axis from the image sensor 300 to the center of the sensor side surface of the last lens. Specifically, if the following condition is satisfied: 0.8 < BFL / L7S2_max_sag to Sensor < 1.2, the manufacturing convenience and the reduction of the TTL are easier.

[0456] [Equation 8] 3 < CT1 / CT7 < 7

[0457] If Equation 8 is satisfied, the aberration characteristics can be improved, and the influence on the reduction of the optical system can be set. Preferably, in Equation 8, the first embodiment can satisfy: 4 < CT1 / CT7 < 5.5, the second embodiment can satisfy: 3 < CT1 / CT7 < 5.5, and the third embodiment can satisfy: 2.5 < CT1 / CT7 < 5.5. Equation 8 can set the center thicknesses of the first lens on the object side of the optical system and the seventh lens having an aspherical surface, and can limit the difference in their center thicknesses. Therefore, the chromatic aberration of the optical system can be improved, good optical performance can be achieved at the set field of view, and the TTL can be controlled.

[0458] [Equation 8 - 1] 0.4 < CT1 / CA11 < 1

[0459] In Equation 8-1, the central thickness CT1 of the first lenses 101 to 141 and the effective diameter CA11 of the object-side surface S1 of the first lens can be set, and if these are satisfied, deterioration of the strength and optical characteristics of the glass lens can be prevented. If it is below the range of Equation 8-1, the lens may be damaged or injection molding may be difficult, and if it is greater than the above range, the TTL may increase and the weight of the optical system may become heavy. Preferably, 0.5 < CT1 / CA11 < 0.90 can be satisfied.

[0460] [Equation 8-2] 0.4 < CT1 / CA41 < 1

[0461] In Equation 8-2, the central thickness CT1 of the first lenses 101 to 141 and the effective diameter CA41 of the object-side surface S7 of the fourth lenses 104 to 144 can be set, and if this is satisfied, the lens with the maximum central thickness and the lens with the maximum effective diameter can be set. Preferably, 0.45 < CT1 / CA41 < 0.8 can be satisfied.

[0462] [Equation 9] 0 < CT3 / CT7 < 3

[0463] CT3 is the central thickness of the third lenses 103 to 143, and CT7 is the central thickness of the seventh lenses 107 to 147. If the optical system satisfies Equation 9, the ratio of the central thicknesses of the aspherical lenses can be set, the aberration characteristics can be improved, and the influence on the reduction of the optical system can be set. Equation 9 preferably satisfies 1.2 < CT3 / CT7 < 1.9.

[0464] [Equation 10] 1 < CT56 / CT7 < 5

[0465] In Equation 10, CT56 is the sum of the central thicknesses of the fifth lens and the sixth lens, for example, the central thickness of the cemented lens CL1 to CT5. That is, CT56 is the optical axis distance from the center of the object-side surface of the fifth lens 105 to 145 to the center of the sensor-side surface of the sixth lens 106 to 146. When the optical system satisfies Equation 10, the central thicknesses of the cemented lens and the adjacent seventh lenses 107 to 147 can be set to improve the aberration characteristics. In Equation 10, the first embodiment can satisfy: 3 < CT56 / CT7 < 4, and the second to fifth embodiments can satisfy: 1.5 < CT56 / CT7 < 4. Here, the following condition can be satisfied: CT56 > ET56, and ET56 is the edge thickness of the cemented lens.

[0466] [Equation 11] 0 < |L2R1 / L4R2| < 5

[0467] In Equation 11, L2R1 represents the radius of curvature of the first surface S1 of the second lens 102 to 142, and L4R2 represents the radius of curvature of the eighth surface S8 of the fourth lens 104 to 144. When the optical system 1000 according to the embodiment satisfies Equation 11, the optical system 1000 can have improved aberration characteristics. Preferably, in Equation 11, the first embodiment can satisfy: 0 < |L2R1 / L4R2| < 1 or 0 < |L2R1 / L4R2| < 0.5, and the second and third embodiments can satisfy: 0 < |L2R1 / L4R2| < 1 or 0 < |L2R1 / L4R2| < 0.8, the fourth embodiment can satisfy: 0 < |L2R1 / L4R2| < 5 or 2 < |L2R1 / L4R2| < 4.5, and the fifth embodiment can satisfy: 0 < |L2R1 / L4R2| < 5 or 0.5 < |L2R1 / L4R2| < 1. [Equation 12] 0 < CT56 - ET56 < 2mm

[0468] In Equation 12, ET56 is the optical axis distance from the end of the effective region of the object side surface of the fifth lens 105 to the end of the effective region of the sensor side surface of the sixth lens 106. When the optical system satisfies Equation 12, the center thickness and edge thickness of the cemented lens can be set to improve aberration characteristics, and preferably, the following conditions can be satisfied: CT56 < CT1. In addition, the following conditions can be satisfied: ET56 < ET1.

[0469] [Equation 13] 0 < CA11 / CA31 < 2

[0470] In Equation 13, CA11 represents the effective diameter of the first surface S1 of the first lens 101, and CA31 represents the effective diameter of the fifth surface S5 of the third lens 103. When Equation 13 is satisfied, the optical system 1000 can control the incident light and set the factors affecting aberration, and preferably, 0.5 < CA11 / CA31 < 1 can be satisfied. Since the first lens and the third lens satisfy Equation 13, the difference in the effective diameters of the first lens and the third lens is not large, so that the influence of assembly can be reduced, and the optical influence of temperature change can be reduced.

[0471] [Equation 14] 0 < CA72 / CA42 < 2

[0472] In Equation 14, CA42 represents the effective diameter of the eighth surface S8 of the fourth lens 104, and CA72 represents the effective diameter of the fourteenth surface S14 of the seventh lens 107. When Equation 14 is satisfied, the optical system 1000 can control the incident light path, and the factors for performance change according to CRA and temperature can be set. Preferably, Equation 14 can satisfy: 0.5 < CA72 / CA42 < 1.0.

[0473] [Equation 15] 0 < CA12 / CA21 < 2

[0474] In Equation 15, CA12 represents the effective diameter of the second surface S2 of the first lens 101, and CA21 represents the effective diameter of the third surface S3 of the second lens 102. When the optical system 1000 according to the embodiment satisfies Equation 15, the optical system 1000 can control the light traveling to the first lens group LG1 and the second lens group LG2, and can set factors that affect the reduction of lens sensitivity. Equation 15 can preferably satisfy 0.5 < CA12 / CA21 < 1. Since the first lens and the second lens satisfy Equation 15, the influence of assembly and tilt on the optical characteristics can be suppressed by the radii of curvature and effective diameters of the first lens and the second lens, and thermal compensation can be performed.

[0475] [Equation 16] 0 < CA31 / CA42 < 2

[0476] CA31 represents the effective diameter of the fifth surface S5 of the third lens 103, and CA42 represents the effective diameter of the eighth surface S8 of the fourth lens 104. When the optical system 1000 according to the embodiment satisfies Equation 16, the sizes of the aspherical lens and the spherical lens can be set. Preferably, the first embodiment, the fourth embodiment, and the fifth embodiment can satisfy: 0.5 < CA31 / CA42 < 1.0, and the second embodiment and the third embodiment can satisfy: 1 < CA31 / CA42 < 1.2.

[0477] [Equation 17] 0 < CA51 / CA62 < 2

[0478] CA51 represents the effective diameter of the ninth surface S9 of the fifth lens 105 to 145, and CA62 represents the effective diameter of the twelfth surface S12 of the sixth lens 106 to 146. When the optical system 1000 according to the embodiment satisfies Equation 17, the optical system 1000 can improve chromatic aberration and set the size between the object side surface and the sensor side surface within the cemented lenses CL1 to CL5. Therefore, by setting the effective diameter size of the cemented lens positioned closer to the object side than the last aspherical lens, the light incident through the cemented lens can be effectively guided to the aspherical lens. Equation 17 can preferably satisfy 1 < CA51 / CA62 < 1.6. Since the cemented lens satisfies Equation 17, the TTL within the optical system can be reduced, the effective diameter of the lens arranged on the sensor side of the cemented lens can be reduced, and a camera device module with a thinner thickness can be provided.

[0479] [Equation 18] 0 < CA62 / CA71 < 2

[0480] CA71 represents the effective diameter of the thirteenth surface S13 of the seventh lens 107 to 147. When the optical system 1000 according to the embodiment satisfies Formula 18, the relationship between the effective diameter of the sensor-side surface of the cemented lenses CL1 to CL5 and the effective diameter of the object-side surface of the adjacent lens can be set. Therefore, the optical system 1000 can improve chromatic aberration, and the size and curvature radius between the sensor-side surfaces of the sixth lens on the sensor side in the cemented lens can be set. Therefore, the effective diameter size of the fifth lens and the sixth lens arranged more on the object side than the last lens can be set. Formula 18 preferably satisfies: 1 <CA62 / CA71<1.2。

[0481] [Formula 18-1] 1mm<(CA61-CA62)<3mm

[0482] In Formula 18-1, the effective diameter difference between the object side surface and the sensor side surface S12 of the sixth lens 106 to 146 may exceed 1 mm, may be greater than the effective diameter difference between the object side surface and the sensor side surface of other lenses, and may be the largest among the effective diameter differences between the object side surface and the sensor side surface of each lens in the optical system. Therefore, by maximizing the effective diameter difference between the object side surface and the sensor side surface of the sixth lens, which is a spherical lens adjacent to the aspherical lens, light refracted by the sixth lens may travel within the effective area of ​​the aspherical lens.

[0483] [Formula 18-2] CA4>CA5>CA6

[0484] [Formula 18-3] CA41>(ImgH*2)

[0485] [Formula 18-4] CA51>(ImgH*2)

[0486] In Formulas 18-2 to 18-4, CA5 is the effective diameter of the fifth lens 105, CA6 is the effective diameter of the sixth lens 106, ImgH is 1 / 2 of the diagonal length of the image sensor 300, and CA62 is the effective diameter of the sensor-side surface of the sixth lens. Therefore, the light path can be set to the area of ​​the image sensor 300 by the effective diameter of the fifth lens 105, the effective diameter of the object-side surface of the fourth lens 104, and the effective diameter of the object-side surface of the fifth lens 105. In an embodiment, since the n-th lens is set as an aspherical lens, the effective diameter ratio of the adjacent spherical lens to the cemented lens can satisfy Formulas 18 to 18-4.

[0487] The first embodiment satisfies: CA62 > (ImgH * 2), the second and third embodiments satisfy: CA62 < (ImgH * 2), and the fourth and fifth embodiments satisfy: CA71 < (ImgH * 2). CA71 is the effective diameter of the object side surface of the seventh lens.

[0488] [Equation 19] 0.2 < GL_CA_Aver / GM_CA_Aver < 2

[0489] In Equation 19, GL_CA_Aver represents the average effective diameter of a glass lens having a spherical surface, and GM_CA_Aver represents the average effective diameter of a glass molded lens having an aspherical surface. In Equation 19, the effective diameters of the spherical lens and the aspherical lens are set so that the path of incident light can be effectively guided. Equation 19 preferably satisfies: 1 < GL_CA_Aver / GM_CA_Aver < 1.2. That is, the difference in the effective diameters of the spherical lens and the aspherical lens can be set not to be large. Here, nGL > nGM can be satisfied. nGL is the number of spherical glass lenses, and nGM is the number of aspherical glass lenses. In the embodiment, by adding an aspherical lens, the number of lenses can be reduced, and deterioration of optical characteristics can be prevented.

[0490] [Equation 20] 0 < GL_nd_Aver / GM_nd_Aver < 1.60

[0491] In Equation 19, GL_nd_Aver is the average value of the refractive indices of lenses made of glass, for example, the average value of the refractive indices of the first lens, the second lens, the fourth lens, the fifth lens, and the sixth lens. GM_nd_Aver is the average value of the refractive indices of the third lens and the seventh lens. Preferably, the refractive indices of the spherical lens and the aspherical lens can be set to satisfy the following condition: 0.7 < GL_nd_Aver / GM_nd_Aver < 1.

[0492] [Equation 20 - 1] 0 < ΣGM_nd / ΣGL_nd < 1

[0493] ΣGM_nd is the sum of the refractive indices of the glass molded lenses, and ΣGL_nd is the sum of the refractive indices of the spherical glass lenses. Preferably, the expression: 0.2 < ΣGM_nd / ΣGL_nd < 0.6, and the fourth and fifth embodiments can satisfy the expression: 0 < ΣGM_nd / ΣGL_nd < 0.4. The optical system can adjust the resolution and dispersion by setting the difference in the refractive indices of the spherical lens and the aspherical lens.

[0494] [Equation 21] CA7 < CA5

[0495] In addition, the first embodiment satisfies the formula: CA6 < CA5, and the second to fifth embodiments may satisfy the formula: (2 * ImgH) < CA6 < CA5 < CA4 < CA3. In Formula 21, CA6 is the effective diameter of the sixth lens 106, CA7 is the effective diameter of the seventh lens 107 to 147, CA5 represents the effective diameter of the fifth lens, CA3 and CA4 represent the effective diameters of the third lens and the fourth lens, and ImgH is 1 / 2 of the diagonal length of the image sensor. If this Formula 21 is satisfied, the optical system can guide light to the central portion and the peripheral portion of the image sensor 300 by setting the effective diameter sizes of the sixth lens and the seventh lens disposed between the fifth lens 105 to 145 and the image sensor 300 to be smaller than the effective diameter of the fifth lens 105 to 145, and chromatic aberration can be improved.

[0496] [Formula 22] CG2 < CG6 < CG3

[0497] In Formula 22, CG2 is the center distance between the second lens and the third lens, CG3 is the center distance between the third lens and the fourth lens, and CG6 is the center distance between the sixth lens and the seventh lens. If Formula 22 is satisfied, the center distances from the second lens to the seventh lens can be set such that the center distances can be reduced, and the optical performance of the peripheral portion of the FOV can be improved.

[0498] [Formula 22-1] G5 < 0.01 mm or CG5 < 0.01 mm

[0499] In Formula 22-1, G5 and CG5 are the distance and the center distance between the fifth lens 105 to 145 and the sixth lens 106 to 146. If Formula 22-1 is satisfied, the fifth lens and the sixth lens can be set as a cemented lens. Here, it is preferably satisfied that CT56 = CT5 + CT6 + CG5, and it can be obtained by the sum of the center thicknesses CT5 and CT6 of the fifth lens and the sixth lens and the center distance CG5 between the fifth lens and the sixth lens.

[0500] [Formula 23] 0 < CT7 / CG6 < 2

[0501] In Formula 23, CG6 is the center distance between the sensor-side surface of the sixth lens 106 to 146 and the object-side surface of the seventh lens 107 to 147. In Formula 23, by setting the center thickness CT7 of the seventh lens and the center distance between the sixth lens and the seventh lens, the optical performance at the peripheral portion of the field of view can be improved. In Formula 23, the first embodiment preferably satisfies: 0.2 < CT7 / CG6 < 0.8, the second and third embodiments satisfy: 0.5 < CT7 / CG6 < 1.5, and the fourth and fifth embodiments satisfy: 0.5 < CT7 / CG6 < 1.

[0502] In the first to third embodiments, the following equation can be satisfied: LD34 < LD12. LD12 is the optical axis distance from the object-side surface of the first lens to the sensor-side surface of the second lens, and LD34 is the optical axis distance from the object-side surface of the third lens to the sensor-side surface of the fourth lens. If Equation 24 is satisfied, the incident light can be guided to the effective region of the aspherical lens, and the TTL can be reduced.

[0503] In the fourth and fifth embodiments, the following equation can be satisfied: L6R2 < CA41. L6R2 is the radius of curvature of the optical axis of the sensor-side surfaces of the sixth lenses 106 and 146, and CA41 is the effective diameter of the object-side surface of the fourth lens. If this equation is satisfied, the radius of curvature of the sensor-side surface of the last spherical lens can be set to be less than the maximum effective diameter, so that the effective diameter of the seventh lens and the size of the image sensor can be adjusted.

[0504] In the first to third embodiments, the following equation can be satisfied: CG57 < CG14, where CG14 is the sum of the center distances between the first lens and the fourth lens, and CG46 represents the sum of the center distances between the fifth lens and the seventh lens. When the above equation is satisfied, the center distances between the lenses located on the object side with respect to the cemented lens and the center distance from the cemented lens to the last lens can be adjusted to guide the incident light to the aspherical lens, improve chromatic aberration, and reduce the TTL.

[0505] In the fourth and fifth embodiments, the following equation can be satisfied: 1.2 < CT1 / ImgH < 2.5. In this equation, by setting CT1 to be greater than 1 / 2 of the diagonal length of the image sensor, the surface of the optical system can be protected, the change in optical characteristics due to temperature change can be reduced, and the deterioration of assembly can be prevented.

[0506] [Equation 24] FOV < 45

[0507] In Equation 24, FOV represents the field of view (degrees) in the diagonal direction of the optical system 1000, and a vehicle optical system with a field of view less than 45 degrees can be provided. The FOV can preferably satisfy: 20 ≤ FOV ≤ 40.

[0508] [Equation 25] 1 < TTL / CA_Max < 5

[0509] CA_Max represents the maximum effective diameter (mm) among the object-side surface and the sensor-side surface of multiple lenses, and TTL (Total Track Length) represents the distance (mm) on the optical axis OA from the vertex of the seventh surface S7 of the fourth lens to the upper surface of the image sensor 300. Equation 71 sets the relationship between the total optical axis length and the maximum effective diameter of the optical system, and an improved vehicle optical system can be provided. Equation 71 preferably satisfies: 2 < TTL / CA_Max ≤ 4.

[0510] [Equation 26] 0 < CT6 / CT7 < 3

[0511] In Equation 26, by setting the center thickness CT6 of the sixth lens to be thicker than the center thickness CT7 of the seventh lens, the factors affecting aberration can be controlled. Preferably, in Equation 26, the first embodiment can satisfy: 1 < CT6 / CT7 < 3 or 1 < CT6 / CT7 < 1.5, and the second to fifth embodiments can satisfy: 0 < CT6 / CT7 < 1.7 or 0.5 < CT6 / CT7 < 1.5. The second embodiment satisfies: CT6 < CT7, the third embodiment can satisfy: CT7 < CT6, the fourth embodiment can satisfy: CT6 > CT7, and the fifth embodiment can satisfy CT7 > CT6.

[0512] [Equation 27] 10 < |L7R1 / CT7| < 60

[0513] In Equation 27, L7R1 represents the radius of curvature of the thirteenth surface of the seventh lens. In Equation 27, by setting the radius of curvature of the object-side surface of the seventh lens and the center thickness of the seventh lens, the refractive power of the seventh lens can be controlled. Therefore, good optical performance can be achieved at the center and periphery of the field of view. Preferably, in Equation 27, the first embodiment can satisfy: 10 < L7R1 / CT7 < 40 or 18 < L7R1 / CT7 < 30, and the second to fifth embodiments can satisfy: 15 < |L7R1 / CT7| < 55. By controlling the radius of curvature and the center thickness of the seventh lens with an aspherical surface according to Equation 27, the TTL of the optical system can be reduced, and the deterioration of optical performance can be prevented.

[0514] [Equation 28] 0 < |L5R2 / L7R1| < 10

[0515] In Formula 28, L5R2 represents the radius of curvature of the tenth surface of the fifth lens. In Formula 28, by setting the radius of curvature of the sensor-side surface of the fifth lens and the radius of curvature of the object-side surface of the seventh lens, the refractive power of the fifth lens and the seventh lens can be controlled. Therefore, it can have good optical performance in the center and periphery of the field of view. Preferably, in Formula 28, the first embodiment can satisfy: 0<|L5R2 / L7R1|<1, the second embodiment and the third embodiment can satisfy: 0<|L5R2 / L7R1|<2 or 0<|L5R2 / L7R1|<2, and the fourth embodiment and the fifth embodiment can satisfy: 0<|L5R2 / L7R1|<2 or 0<|L5R2 / L7R1|<1.

[0516] In the first embodiment, the following formula is satisfied: L1R1*L1R2>0, where L1R1 is the radius of curvature of the object-side surface of the first lens, and L1R2 represents the radius of curvature of the sensor-side surface of the first lens. When this formula is satisfied, the refractive power of the first lens can be controlled to control the incident light as a spherical lens. Preferably, L1R1+L1R2<0 can be satisfied. By setting the radius of curvature of the first lens according to this formula, the assembly performance of the spherical lens can be prevented from being deteriorated, and the distance between the first lens and the second lens can be set.

[0517] In the second to fifth embodiments, the following formula may be satisfied: L1R1*L5R2>0. L1R1 represents the radius of curvature of the object-side surface of the first lens, and L5R2 represents the radius of curvature of the sensor-side surface of the fifth lens. When this formula is satisfied, the refractive power of the first lens and the fifth lens may be controlled to control the incident light to the spherical lens. Preferably, L1R1<0, L5R2<0, and L1R2*L5R2>0 may be satisfied. By setting the radius of curvature of the first lens using this formula, the assemblability of the spherical lens may be prevented from being deteriorated, and the distance between the first lens and the second lens may be set.

[0518] [Formula 29]2 <TTL / ImgH<15

[0519] Equation 29 may set the total optical axis length (TTL) of the optical system and the diagonal length (ImgH) of the image sensor 300 from the optical axis. When the optical system 1000 according to the embodiment satisfies Equation 72, the optical system 1000 may have a TTL suitable for the vehicle image sensor 300, thereby providing improved image quality. Equation 29 may preferably satisfy: 4 <TTL / ImgH≤10。

[0520] [Equation 30] 0<|L5R1 / L6R2|<2

[0521] L5R1 represents the radius of curvature of the object-side surface of the fifth lens, and L6R2 represents the radius of curvature of the sensor-side surface of the sixth lens. If Equation 30 is satisfied, the fourth lens and the fifth lens can be represented as a cemented lens. Preferably, 0 < |L5R1 / L6R2| < 1 can be satisfied. The radius of curvature of the interface between the fifth lens and the sixth lens is the same. For example, L6R1 / L5R2 = 1 can be satisfied.

[0522] [Equation 31] 0 < |L6R2 / L6R1| < 2

[0523] L6R1 represents the radius of curvature of the object-side surface of the sixth lens, and L6R2 represents the radius of curvature of the sensor-side surface of the sixth lens. In Equation 31, by setting the radius of curvature of the object-side surface and the sensor-side surface of the sixth lens, light can be effectively refracted from the cemented lens toward the aspherical lens. Preferably, in Equation 31, the first embodiment can satisfy: 0 < |L6R2 / L6R1| < 1, and the second to fifth embodiments can satisfy: 0.5 < |L6R2 / L6R1| < 1.

[0524] [Equation 31-1] 0 < L7R1 / L7R2 < 7

[0525] In Equation 31-1, L7R1 and L7R2 represent the radius of curvature of the object-side surface and the sensor-side surface of the seventh lens. In Equation 31-1, by setting the radius of curvature of the object-side surface and the sensor-side surface of the seventh lens, light can be refracted through the aspherical lens to the image sensor. In Equation 31-1, the first embodiment can preferably satisfy: 0 < L7R1 / L7R2 < 1 or 0 < L7R1 / L7R2 < 0.5, and the second to fifth embodiments can satisfy: 2 < |L7R1 / L7R2| < 7 or 3 < |L7R1 / L7R2| < 5.

[0526] In the first embodiment, the equation: 0 < CT_Max / CG_Max < 5 is satisfied, and the maximum center thickness CT_Max among the lenses and the maximum center distance CG_Max between adjacent lenses can be set. If this equation is satisfied, the optical system can have good optical performance at the focal length under the set field of view, and the TTL can be reduced. Preferably, the embodiment can satisfy: 1 < CT_Max / CG_Max < 2.

[0527] In the second to fifth embodiments, the formula: 0 < CT_Max / CG_Max < 5 is satisfied, and this formula can set the maximum center thickness CT_Max among the lenses and the maximum center distance CG_Max between adjacent lenses. If this formula is satisfied, the optical system can have good optical performance at the focal length under the set field of view and can reduce the TTL. Preferably, the second and third embodiments can satisfy: 2 < CT_Max / CG_Max < 3, and the fourth and fifth embodiments can satisfy: 1.5 < CT_Max / CG_Max < 4.

[0528] [Equation 32] 0.1 < BFL / ImgH < 2

[0529] Equation 32 can set the optical axis distance between the image sensor 300 and the last lens and the diagonal length starting from the optical axis of the image sensor 300. When the optical system 1000 according to the embodiment satisfies Equation 73, the optical system 1000 can ensure the BFL (back focal length) for the size of the application vehicle image sensor 300, set the interval between the last lens and the image sensor 300, and have good optical characteristics at the central part and the peripheral part of the FOV. Equation 32 preferably satisfies the following conditions: 0.3 < BFL / ImgH < 1, and BFL < ImgH.

[0530] [Equation 33] 1 < ΣCT / ΣCG < 5

[0531] In Equation 33, ΣCT is the sum of the center thicknesses of the lenses, and ΣCG is the sum of the center distances between adjacent lenses. When Equation 33 is satisfied, the optical system can have good optical performance at the focal length under the set field of view and can reduce the TTL. Preferably, the first embodiment can satisfy: 2 < ΣCT / ΣCG < 3, the second and third embodiments can satisfy: 3 < ΣCT / ΣCG < 4.5, and the fourth and fifth embodiments can satisfy: 2 < ΣCT / ΣCG < 4.5.

[0532] [Equation 34] 8 < Σnd < 20

[0533] Σnd represents the sum of the refractive indices of each of the plurality of lenses at the d-line. If Equation 34 is satisfied, the optical system 1000 in which an aspherical lens and a spherical lens are mixed can control the TTL and have improved resolution. Additionally, if the number of spherical lenses is greater than the number of aspherical lenses, and if the number of spherical lenses with a relatively thick thickness is large, the TTL and the sum of the refractive indices can be set. Equation 34 can preferably satisfy: 10 < Σnd < 13.

[0534] [Equation 35] 10 < ΣAbbe / Σnd < 50

[0535] ΣAbbe represents the sum of the Abbe numbers of each of the plurality of lenses. If equation 35 is satisfied, the optical system 1000 may have improved aberration characteristics and resolution. Equation 35 sets the sum of the Abbe sum and the refractive index of the lens to control the optical characteristics, and preferably satisfies: 20<ΣAbbe / Σnd<40.

[0536] [Formula 36]Distortion<2

[0537] Distortion represents the maximum value or the absolute value of the maximum value of the distortion from the center (0.0F) to the diagonal end (1.0F) of the image sensor based on the optical characteristics detected by the image sensor 300. When the optical system 1000 satisfies Equation 36, the optical system 1000 can improve the distortion characteristics and set the conditions for image processing. Preferably, Distortion<1 can be satisfied.

[0538] [Equation 37] 0<ΣCT / ΣET<2

[0539] ΣCT is the sum of the center thickness of the lens, and ΣET is the sum of the edge thickness of the effective area of ​​the lens. If equation 37 is satisfied, the optical system can have good optical performance at the focal length under a set field of view, and TTL can be reduced. Equation 37 can preferably satisfy: 1<ΣCT / ΣET<1.5.

[0540] [Equation 38] 0.5 <CA11 / CA_Min<2.5

[0541] CA11 is the effective diameter of the object side surface of the first lens, and CA_Min represents the minimum effective diameter among the object side surface and the sensor side surface of the lens. If equation 38 is satisfied, the optical system can control incident light, maintain optical performance, and provide a thinner module. Equation 38 may preferably satisfy: 1 <CA11 / CA_Min<2。

[0542] [Formula 39]1 <CA_Max / CA_Min<5

[0543] CA_Max represents the maximum effective diameter between the object side surface and the sensor side surface of the lens. If equation 39 is satisfied, the optical system can be dimensioned to be thin and compact while maintaining optical performance. Equation 39 may preferably satisfy: 1 <CA_Max / CA_Min<2。

[0544] [Formula 40]1 <CA_Max / CA_Aver<3

[0545] CA_Aver represents the average value of the effective diameters of the object side surface and the sensor side surface of the lens. If equation 40 is satisfied, the optical system can be dimensioned to be thin and compact while maintaining optical performance. Equation 40 may preferably satisfy: 1 <CA_Max / CA_Aver<1.5。

[0546] [Equation 41] 0.5 <CA_Min / CA_Aver<2

[0547] If equation 41 is satisfied, the optical system can be dimensioned to be thin and compact while maintaining optical performance. Equation 41 may preferably satisfy: 0.5 <CA_Min / CA_Aver<1。

[0548] [Formula 42]1 <CA_Max / (2*ImgH)<3

[0549] Equation 42 may be set to the maximum effective diameter CA_Max of the lens surface and the diagonal length of the image sensor, and if the optical system satisfies this, the optical system may maintain good optical performance and set the size of a slim and compact structure. Equation 42 may preferably satisfy: 1 <CA_Max / (2*ImgH)<2。

[0550] [Formula 43]1 <TD / CA_Max<4

[0551] TD is the optical axis distance from the center of the object side surface of the first lens to the center of the sensor side surface of the last lens. If equation 43 is satisfied, the total optical axis distance and the maximum effective diameter of the lens can be set, and the size of good optical performance can be set. Equation 43 preferably satisfies: 2 <TD / CA_Max<3。

[0552] [Formula 43-1]TD>SD

[0553] SD is the distance from the position of the aperture stop to the center of the last lens on the sensor side.

[0554] [Formula 44]1 <F / CA61<10

[0555] In equation 44, F represents the EFL of the optical system and may be 10 mm or greater, for example, in the range of 10 mm to 20 mm. In equation 44, by setting the relationship between the effective focal length and the effective diameter of the object-side surface of the last spherical lens, the effect on the optical system reduction, such as TTL, may be controlled. Equation 44 may preferably satisfy: <F / CA61<2。

[0556] [Formula 45]0 <F / |L1R1|<1

[0557] In Equation 45, by setting the effective focal length of the optical system and the radius of curvature of the object-side surface of the first lens, the influence on incident light and TTL can be controlled. Equation 45 preferably satisfies: 0.5 < F / |L1R1| < 1.

[0558] [Equation 46] Max(CT / ET) < 4

[0559] Max(CT / ET) represents the maximum value of the ratio of the center thickness to the edge thickness of each lens. When Equation 46 is satisfied, the optical system can control the influence on the effective focal length. In Equation 46, the first to third embodiments preferably satisfy: 2 < Max(CT / ET) < 3, and the fourth and fifth embodiments can satisfy: 2.5 < Max(CT / ET) < 3.5.

[0560] The ratio of the center thickness to the edge thickness of the aspherical lens in the lens portion can satisfy the following condition: 0.50 < GM(CT / ET) < 1.3. The ratio of the center thickness to the edge thickness of the spherical lens in the lens portion can satisfy the following condition: 0.50 < GL(CT / ET) < 3 or 0.50 < GL(CT / ET) < 3.5. If the condition of the aspherical lens is less than the lower limit of the above range, it is difficult to manufacture the glass molded lens. That is, when manufacturing by injecting high-temperature resin and hardening at low temperature, if the thickness difference is large, the lens may not shrink uniformly when cooled at low temperature, which will result in a high surface defect rate. In addition, as the temperature changes from -40 degrees to 105 degrees, the aspherical lens shrinks and expands, and during this process, the change rate of the lens shape seems to be large, which may deteriorate the performance of the optical system.

[0561] [Equation 47] 0 < EPD / |L1R1| < 1

[0562] EPD represents the size (mm) of the entrance pupil diameter of the optical system 1000, and L1R1 represents the radius of curvature (mm) of the first surface S1 of the first lens. When the optical system 1000 according to the embodiment satisfies Equation 47, the optical system 1000 can control the incident light. Equation 47 preferably satisfies: 0.3 < EPD / |L1R1| < 0.7.

[0563] [Equation 48] -10 < F1 / F3 < 0

[0564] F1 is the focal length of the first lens, and F3 is the focal length of the third lens. If Equation 48 is satisfied, the refractive powers of the first lens and the third lens can be controlled to improve the resolution, and it can affect TTL and EFL. The fourth and fifth embodiments can satisfy: -1 < F1 / F3 < 0.

[0565] [Equation 48-1] |F6| < F4

[0566] [Formula 48-2]|F6| <F5

[0567] [Formula 48-3]|F6|<|F7|

[0568] In Formulas 48-1 to 48-3, F5 is the focal length of the fifth lens, F4 is the focal length of the fourth lens, F6 is the focal length of the sixth lens, and F7 is the focal length of the seventh lens. Therefore, the absolute value of the focal length of the sixth lens adjacent to the last aspherical lens can be smaller than the focal lengths of the fourth lens and the fifth lens and smaller than the focal length of the seventh lens. Therefore, the refractive power of the last spherical lens can be controlled to effectively guide light to the aspherical lens.

[0569] The aperture stop ST is arranged on the sensor side surface of the first lenses 101 to 141. The focal length of the lens arranged more on the sensor side than the aperture stop ST and arranged closest to the aperture stop ST is greater than 0. In an embodiment of the present invention, the focal length F2 of the second lenses 102 to 142 should be designed to be greater than 0. In this case, the second lenses 102 to 142 collect light so that the effective diameters of the fourth to seventh lenses arranged closer to the sensor than the second lenses 102 to 142 can be prevented from increasing. In addition, since the TTL can be prevented from becoming longer, the optical system can be miniaturized. The composite focal length of the fourth to seventh lenses can have a positive refractive power.

[0570] The composite focal length of the lens arranged closer to the sensor than the aperture stop ST, that is, the lens arranged closer to the sensor than the aperture, is designed to be greater than 0. In an embodiment of the present invention, the composite focal lengths of the second to seventh lenses are designed to be greater than 0. In this case, the optical system can be miniaturized by reducing TTL at a horizontal field of view (FOV_H) of 25 to 35 degrees.

[0571] [Equation 49]Po5*Po6<0

[0572] Po5 is the refractive power value of the fifth lens, and Po6 is the refractive power value of the sixth lens. That is, the refractive powers of the fifth lens and the sixth lens have opposite refractive powers, so they can improve aberration and effectively guide light with an aspherical lens. If the value of Po4*Po5 is greater than 0, the effect of improving chromatic aberration as a cemented lens does not seem significant.

[0573] [Formula 49-1]Po1(Po5*Po6)>0

[0574] [Formula 49-2]F56>0

[0575] [Formula 49-3] F5*F6<0

[0576] Po1 is the refractive power value of the first lens, F56 is the combined focal length of the fifth and sixth lenses, F5 is the focal length of the fifth lens, and F6 is the focal length of the sixth lens. If Equations 49-1 to 49-3 are satisfied, the fifth and sixth lenses, which are cemented lenses, are likely to improve the aberration of the optical system, and incident light can be effectively guided to the aspherical lens.

[0577] [Equation 50] 15 < v5 - v6 < 60

[0578] In Equation 50, v5 is the Abbe number of the fifth lens, and v6 is the Abbe number of the sixth lens. If Equation 50 is satisfied, the difference in Abbe numbers between at least two lenses forming the cemented lens can be maintained at a certain value or greater, and chromatic aberration can be improved. Equation 50 can preferably be satisfied as: 20 < v5 - v6 < 40. If the difference in Abbe numbers of the cemented lens is less than the lower limit of Equation 50, it may not be significant in improving the aberration characteristics of the optical system. Therefore, if the difference in Abbe numbers between the object-side lens and the sensor-side lens in the cemented lens is greater than 20 and less than 40, the aberration characteristics can be improved.

[0579] [Equation 50-1] (v1 * n1) < (v2 * n2) < (v4 * n4)

[0580] v1, v2, and v4 are the Abbe numbers of the first, second, and fourth lenses, and n1, n2, and n4 are the refractive indices at the d-line of the first, second, and fourth lenses.

[0581] [Equation 51] 0 < |F1 / F| < 20

[0582] Equation 51 sets the relationship between the focal length F1 of the first lens and the effective focal length F, such that the TTL of the optical system can be set. Equation 51 is preferably satisfied as: 1 < |F1 / F| < 5.

[0583] [Equation 52] 0 < |F5 / F6| < 2

[0584] In Equation 52, by setting the relationship between the focal lengths F5 and F6 of the fifth and sixth lenses, the refractive power and optical path of the last spherical lens can be adjusted, and the resolution can be improved. Equation 52 is preferably satisfied as: 1 < |F5 / F6| < 1.5.

[0585] [Equation 53] 0 < |F5 / F7| < 1

[0586] In Formula 53, by setting the relationship between the focal lengths F5 and F7 of the fifth lens and the seventh lens, the refractive power and the optical path of the spherical lens and the last aspherical lens can be adjusted, and the resolution can be improved. In Formula 53, the first to third embodiments preferably satisfy: 0.2<|F5 / F7|<0.6, and the fourth and fifth embodiments can satisfy: 0.2<|F5 / F7|<0.7.

[0587] [Equation 54] 0<|F6 / F1|<1.2

[0588] In Formula 54, by setting the relationship between the focal length F1 of the first lens and the focal length F6 of the sixth lens, the refractive power and the optical path of the first spherical lens and the last spherical lens can be adjusted, and the influence of TTL can be adjusted to improve the resolution. Formula 54 preferably satisfies: 0.1<|F6 / F1|<0.6.

[0589] [Equation 55] 0<|F27 / F|<2

[0590] In Formula 55, by setting the relationship between the composite focal length F27 of the second to seventh lenses and the effective focal length F, the refractive power of the second to seventh lenses can be controlled to improve the resolution, and the optical system can be provided in a slim and compact size. Formula 55 preferably satisfies: 0<|F27 / F|<0.5.

[0591] [Formula 56] 1<|F47 / F6|<25

[0592] In Formula 56, the relationship between the composite focal length F47 of the fourth to seventh lenses and the focal length F6 of the sixth lens is set so that the composite refractive power of the fourth to seventh lenses and the refractive power of the final spherical lens can be adjusted to improve the resolution, and the optical system can be provided in a slim and compact size. Preferably, in Formula 56, the first embodiment can satisfy: 1<|F47 / F6|<5 or 2.5<|F47 / F6|<4.5, the second and third embodiments can satisfy: 10<|F47 / F6|<20, and the fourth and fifth embodiments can satisfy: 1<|F47 / F6|<10 or 1<|F47 / F6|<5.

[0593] [Equation 57] 0<|F47 / F7|<10

[0594] In Formula 57, the relationship between the composite focal length F47 of the fourth to seventh lenses and the focal length F7 of the seventh lens is set so that the composite refractive power of the fourth to seventh lenses and the refractive power of the last aspherical lens can be adjusted to improve the resolution, and the optical system can be provided in a slim and compact size. In Formula 57, the first embodiment can preferably satisfy: 1<|F47 / F7|<3 or 1<|F47 / F7|<2, and the second to fifth embodiments can satisfy: 2<|F47 / F7|<8.

[0595] [Equation 58] 0<|F6 / F|<5

[0596] In Formula 58, the relationship between the focal length F6 of the sixth lens and the effective focal length F is set so that the resolution can be improved by adjusting the refractive power of the last spherical lens and the entire focal length, and the optical system can be provided in a slim and compact size. Formula 58 preferably satisfies: 0<|F6 / F|<1.

[0597] [Equation 59] F_LG1 / F_LG2<0

[0598] In Formula 59, a relationship between the focal length F_LG1 of the first lens group LG1 and the focal length F_LG2 of the second lens group may be set. The focal length of the first lens group may have a negative value, and the focal length of the second lens group may have a positive value. When Formula 59 is satisfied, the optical system 1000 may improve aberration characteristics such as chromatic aberration and distortion aberration. Formula 59 may preferably satisfy: 2<|F_LG1 / F_LG2|<7.

[0599] [Formula 60]1 <nGL / nGM<4

[0600] In Formula 60, nGL represents the number of spherical lenses, and nGM represents the number of aspherical lenses. By arranging the number of aspherical lenses in Formula 60 to be more than 1 times the number of spherical lenses, the thickness of the optical system can be reduced and more refractive power can be provided by the aspherical surface. Formula 60 can preferably satisfy: 2 <nGL / nGM<3。

[0601] [Formula 61]1 <nSS / nAS<4

[0602] nSS is the number of spherical lens surfaces within the lens portion, and nAS is the number of aspherical lens surfaces within the lens portion. In Formula 61, by arranging the number of aspherical lens surfaces to be more than 1 times the number of spherical lens surfaces, the thickness of the optical system can be reduced, and a wider range of refractive power can be provided by the aspherical surfaces. Formula 61 preferably satisfies: 2 <nSS / nAS<3。

[0603] [Equation 62] (CAS_Max / CAS_Min) < (CT_Max / CT_Min)

[0604] CAS_Max is the maximum effective diameter of the object side surface and the sensor side surface of the lens, and CAS_Min is the minimum effective diameter of the object side surface and the sensor side surface of the lens. CT_Max is the maximum center thickness of the lens, and CT_Min is the minimum center thickness of the lens. Equation 62 can improve the assembly of the lens by setting the difference in the effective diameter of the lens to be less than the difference in the center thickness of the lens. Preferably, 1.5 < (CAS_Max / CAS_Min) < (CT_Max / CT_Min) < 4 can be satisfied.

[0605] [Equation 63] 0 < ΣGM_CT / ΣGL_CT < 1

[0606] ΣGM_CT is the sum of the center thicknesses of the aspherical lenses, and ΣGL_CT is the sum of the center thicknesses of the spherical lenses. If Equation 62 is satisfied, the overall TTL can be controlled by setting the relationship between the thickness of the aspherical lens and the thickness of the spherical lens with respect to the TTL. In Equation 63, preferably in the first to third embodiments: 0 < ΣGM_CT / ΣGL_CT < 0.5, and in the fourth and fifth embodiments: 0.2 < ΣGM_CT / ΣGL_CT < 0.9 can be satisfied.

[0607] [Equation 64] 10 mm < TTL < 50 mm

[0608] TTL (Total Trajectory Length) represents the distance (mm) from the center of the first surface S1 of the first lens 101 to 141 to the surface of the image sensor 300 on the optical axis OA. In Equation 64, TTL can be set to be more than 10 mm or 20 mm to provide a vehicle optical system. Preferably, Equation 64 satisfies: 22 mm < TTL < 40 mm or satisfies the following condition: TD < TTL.

[0609] [Equation 65] 2 mm < ImgH

[0610] Equation 65 can set the diagonal length (2*ImgH) of the image sensor 300 and can provide an optical system with a vehicle sensor size. Preferably, Equation 65 satisfies: 4 mm ≤ ImgH.

[0611] [Equation 66] 2 mm < BFL < 7 mm

[0612] In Equation 66, the BFL (back focal length) is set to be greater than 2 mm and less than 7 mm, thereby ensuring the installation space for the optical filter 500 and the cover glass 400, improving the assemblability of components through the distance between the image sensor 300 and the last lens, and enhancing the bonding reliability. Equation 66 can preferably satisfy: 2.5 mm ≤ BFL ≤ 3.5 mm. If the BFL is less than the range of Equation 68, some of the light transmitted to the image sensor may not reach the image sensor, resulting in a reduction in resolution. If the BFL exceeds the range of Equation 68, stray light may be introduced, which may deteriorate the aberration characteristics of the optical system.

[0613] [Equation 67] 0 < BFL / CG3 < 1

[0614] In Equation 67, the BFL (back focal length) sets the distance between lenses, such as the center distance CG3 between the third lens and the fourth lens, thereby ensuring the installation space for the optical filter 500 and the cover glass 400, improving the assemblability of components through the distance between the image sensor 300 and the last lens, and enhancing the bonding reliability. In Equation 67, the first embodiment can satisfy: 0.3 < BFL / CG3 < 0.8, and the second to fifth embodiments can satisfy: 0.3 < BFL / CG3 < 1. The center distance CG3 between the third lens and the fourth lens can be the largest within the lens portion.

[0615] [Equation 68] 1 < CT1 / BFL < 3.5

[0616] In Equation 68, the BFL (back focal length) is set to be less than the distance between lenses, such as the center thickness of the first lens, so as to ensure the installation space for the optical filter 500 and the cover glass 400, improving the assemblability of components through the distance between the image sensor 300 and the last lens and enhancing the bonding reliability. Additionally, the seventh lens, which is the last lens, can disperse the incident light to the effective area of the image sensor. However, if the BFL does not satisfy Equation 68, some of the emitted light may not reach the effective area of the image sensor, which may reduce the resolution. Preferably, the first embodiment can satisfy: 1 < CT1 / BFL < 3 or 2 < CT1 / BFL < 3, and the second to fifth embodiments can satisfy: 2 < CT1 / BFL < 3.5.

[0617] [Equation 69] 3 < F < 40

[0618] Equation 69 can set the total effective focal length F suitable for the vehicle optical system. Equation 69 can satisfy 10 < F < 30.

[0619] [Equation 70] 5 < TTL / BFL < 20

[0620] Equation 70 may set the total optical axis length (TTL) of the optical system and the optical axis distance (BFL) between the image sensor 300 and the last lens. When the optical system 1000 according to the embodiment satisfies Equation 70, the optical system 1000 may ensure the BFL. Equation 70 may preferably satisfy: 8 <TTL / BFL<16。

[0621] [Formula 71]1 <TTL / F<3

[0622] Formula 71 can set the total focal length F and the total optical axis length (TTL) of the optical system 1000. Therefore, an optical system for a driver assistance system can be provided. Formula 71 can preferably satisfy: 1.5≤TTL / F≤2.8. When the optical system 1000 according to the embodiment satisfies Formula 75, the optical system 1000 can have an appropriate focal length within the set TTL range, and provide an optical system that can maintain an appropriate focal length and form an image even when the temperature changes from a low temperature to a high temperature. If it is less than the lower limit of Formula 71, it is necessary to increase the refractive power of the lens, making it difficult to correct spherical aberration or distortion aberration, and if it exceeds the upper limit of Formula 71, the effective diameter or TTL of the lens becomes longer, so that problems of a large-size photographic lens system may arise.

[0623] [Formula 72]1 <F / BFL<10

[0624] Formula 72 may set the total effective focal length F of the optical system 1000 and the optical axis distance (BFL) between the image sensor 300 and the last lens. If the optical system 1000 according to the embodiment satisfies Formula 72, the optical system 1000 may have a set field of view and an appropriate focal length, and may provide a vehicle optical system. In addition, the optical system 1000 may minimize the distance between the last lens and the image sensor 300, so that it may have good optical characteristics in the peripheral portion of the FOV. Formula 72 may preferably satisfy: 3 <F / BFL<8。

[0625] [Formula 73]1 <F / ImgH<5

[0626] Equation 73 may set the total effective focal length F of the optical system 1000 and the diagonal length (ImgH) of the optical axis of the image sensor 300. The optical system 1000 may have improved aberration characteristics at the size of the vehicle image sensor 300. Equation 73 may preferably satisfy: 2 <F / ImgH<4.1。

[0627] [Formula 74]1 <F / EPD<5

[0628] Equation 74 can set the total effective focal length F and the entrance pupil diameter of the optical system 1000. Therefore, the overall brightness of the optical system can be controlled. Preferably, Equation 74 can set: 1 < F / EPD < 3.

[0629] [Equation 75] 0 < BFL / TD < 0.3

[0630] Equation 75 can set the relationship between the optical axis distance (TD) and the BFL of the lens of the optical system 1000. Therefore, the resolution of the optical system can be maintained and the overall size can be controlled. Preferably, Equation 75 can satisfy: 0 < BFL / TD < 0.2. When the conditional value of BFL / TD is 0.2 or more, since the BFL is designed to be large compared to the TD, the size of the entire optical system becomes large, which makes it difficult to miniaturize the optical system, and the distance between the seventh lens and the image sensor becomes long, which may increase the unnecessary amount of light passing through the seventh lens and the image sensor, which may cause deterioration of the aberration characteristics, resulting in a problem of reduced resolution.

[0631] [Equation 76] 0 < EPD / ImgH / FOV < 0.2

[0632] Equation 75 can set the relationship between the EPD, the length (ImgH) that is half of the diagonal length of the image sensor, and the field of view in the diagonal direction. Therefore, the overall size and brightness of the optical system can be controlled. Equation 80 preferably satisfies: 0 < EPD / ImgH / FOV < 0.1.

[0633] [Equation 77] 5 < FOV / F# < 40

[0634] Equation 77 can set the relationship between the diagonal field of view of the optical system and the F-number. Preferably, Equation 77 can satisfy: 10 < FOV / F# < 30. Here, the F# is set to 1.8 or less in order to provide a bright image.

[0635] [Equation 78] 1 < ΣGL_CT / F# < 20

[0636] Equation 78 can set the relationship between the sum ΣGL_CT of the center thicknesses of the glass lenses of the optical system and the F-number (F#). Preferably, in Equation 78, the first embodiment can satisfy: 1 < ΣGL_CT / F# < 5, and the second to fifth embodiments can satisfy: 5 < ΣGL_CT / F# < 15.

[0637] [Equation 79] 1 < ΣGM_CT / F# < 5

[0638] Equation 79 can set the relationship between the sum ΣGM_CT of the center thicknesses of the aspherical lenses of the optical system and the F-number F#. Preferably, Equation 79 can satisfy: 1 < ΣGM_CT / F# < 3.

[0639] [Equation 80] 1<ΣGL_nd / F#<10

[0640] The relationship between the sum of the refractive indices ΣGL_nd of the spherical lenses of the optical system and the F number F# can be set in equation 80. Preferably, equation 80 can satisfy: 3<ΣGL_nd / F#<10.

[0641] [Equation 81] 1<ΣGM_nd / F#<10

[0642] The relationship between the sum of the refractive indices ΣGM_nd of the aspherical lenses of the optical system and the F number F# can be set by equation 81. Equation 81 preferably satisfies: 1<ΣGM_nd / F#<5.

[0643] [Equation 82]|Max_Sag62|<|Max_Sag51|

[0644] Max_Sag62 is the maximum distance in the optical axis direction from the straight line perpendicular to the optical axis on the sensor side surface of the sixth lens to the sensor side surface of the sixth lens, and Max_Sag51 is the maximum distance in the optical axis direction from the straight line perpendicular to the optical axis on the object side surface of the fifth lens to the object side surface of the fifth lens. When Formula 86 is satisfied, light can be guided from the last spherical lens to the last aspherical lens by the curvature radius of the sensor side surface of the sixth lens, and the effective diameters of the fifth and sixth lenses can be adjusted.

[0645] [Equation 83]|Max_Sag72|<|Max_Sag62|

[0646] Max_Sag72 is the maximum distance in the optical axis direction from the straight line on the sensor side surface of the seventh lens perpendicular to the optical axis to the sensor side surface of the seventh lens. When equation 83 is satisfied, light can be guided from the last spherical lens to the last aspherical lens by the curvature radius of the sensor side surface of the sixth lens, and the effective diameters of the sixth lens and the seventh lens can be adjusted.

[0647] The first to third embodiments may satisfy at least one of the following: |Max_Sag41|<|Max_Sag52|, |Max_Sag52|<|Max_Sag51|, and |Max_Sag72|<|Max_Sag71|. In addition, the fourth and fifth embodiments may satisfy at least one of the following: |Max_Sag52|<|Max_Sag41|, |Max_Sag52|<|Max_Sag51|, and |Max_Sag72|<|Max_Sag71|.

[0648] Max_Sag41 is the maximum distance in the optical axis direction from the straight line perpendicular to the optical axis on the object side surface of the fourth lens to the object side surface of the fourth lens. Max_Sag52 is the maximum distance in the optical axis direction from the straight line perpendicular to the optical axis on the sensor side surface of the fifth lens to the sensor side surface of the fifth lens. Max_Sag71 is the maximum distance in the optical axis direction from the straight line perpendicular to the optical axis on the object side surface of the seventh lens to the object side surface of the seventh lens.

[0649] [Formula 84]

[0650]

[0651] In Formula 84, Z may represent the distance from any position on the aspherical surface to the vertex of the aspherical surface in the direction of the optical axis. Y may represent the distance from any position on the aspherical surface to the optical axis in the direction perpendicular to the optical axis. c may represent the curvature of the lens, and K may represent the cone constant. In addition, A, B, C, D, E, and F may represent aspherical coefficients.

[0652] The optical system 1000 according to the embodiment may satisfy at least one or two or more of equations 1 to 83. In this case, the optical system 1000 may have improved optical characteristics, improved resolution, and improved aberration characteristics and distortion characteristics. In addition, the optical system 1000 may ensure the BFL (back focal length) for applying the vehicle image sensor 300, may compensate for the degradation of the optical characteristics due to temperature changes, and may minimize the distance between the last lens and the image sensor 300, so that it may have good optical performance at the center and periphery of the FOV.

[0653] Table 4 shows the terms of the above formula in the optical system 1000 of the embodiment, including TTL (mm), back focal length (BFL), effective focal length F (mm), ImgH (mm), effective diameter (CA) (mm), thickness (mm), optical axis distance TD (mm) from the first surface S1 to the fourteenth surface S14, focal length F1, F2, F3, F4, F5, F6 and F7 (mm) of each of the first lens to the seventh lens, the sum of refractive indices, the sum of Abbe numbers, the sum of thicknesses (mm), the sum of distances between adjacent lenses, diagonal FOV (degrees), edge thickness (ET), focal lengths of the first lens group and the second lens group, F-number, etc.

[0654] [Table 4]

[0655]

[0656]

[0657] Table 5 shows the result values ​​of the above-mentioned formulas 1 to 30 in the optical system 1000 of the embodiment. Referring to Table 5, it can be seen that the optical system 1000 satisfies at least one, two or more, or three or more of the formulas 1 to 30. Therefore, the optical system 1000 can have good optical performance and excellent optical characteristics in the center and periphery of the FOV.

[0658] [Table 5]

[0659]

[0660]

[0661]

[0662] Table 6 shows the result values ​​of the above-mentioned equations 31 to 60 in the optical system 1000 of the embodiment. Referring to Table 6, it can be seen that the optical system 1000 satisfies at least one, two or more, or three or more of equations 1 to 44. Therefore, the optical system 1000 can have good optical performance and excellent optical characteristics in the central part and the peripheral part of the FOV.

[0663] [Table 6]

[0664]

[0665]

[0666] Table 7 shows the result values ​​of the above-mentioned equations 61 to 83 in the optical system 1000 of the embodiment. Referring to Table 7, it can be seen that the optical system 1000 satisfies at least one, two or more, or three or more of equations 61 to 83. Specifically, it can be seen that the optical system 1000 according to the embodiment satisfies all of equations 1 to 83. Therefore, the optical system 1000 can have good optical performance and excellent optical characteristics at the central part and the peripheral part of the FOV.

[0667] [Table 7]

[0668]

[0669]

[0670] Fig.54 2 is an example of a plan view of a vehicle to which a camera module or an optical system according to an embodiment of the present invention is applied. Fig.54 , the vehicle camera system according to an embodiment of the present invention includes an image generation unit 11, a first information generation unit 12, second information generation units 21, 22, 23, 24, 25 and 26, and a control unit 14. The image generation unit 11 may include at least one camera module 31 disposed in the vehicle, and may capture images of the front of the vehicle and / or the driver to generate images of the front or interior of the vehicle. The image generation unit 11 may use the camera module 31 to capture images of the front of the vehicle and the surrounding environment of the vehicle in one or more directions to generate images of the surrounding environment of the vehicle. Here, the front image and the surrounding image may be digital images, and may include color images, black and white images, and infrared images. In addition, the front image and the surrounding image may include still images and moving images. The image generation unit 11 provides the driver image, the front image, and the surrounding image to the control unit 14. Next, the first information generation unit 12 may include at least one radar and / or camera placed in the own vehicle, and detects the front of the own vehicle to generate first detection information. Specifically, the first information generating unit 12 is placed in the own vehicle, and detects the position and speed of a vehicle located in front of the own vehicle, the presence and position of a pedestrian, and the like to generate first detection information.

[0671] Using the first detection information generated by the first information generating unit 12, the distance between the own vehicle and the vehicle in front can be controlled to be maintained at a constant level, and in a pre-set specific situation, such as when the driver wants to change the driving lane of the own vehicle or when reversing and parking, the stability of the vehicle operation can be improved. The first information generating unit 12 provides the first detection information to the control unit 14. The second information generating units 21, 22, 23, 24, 25 and 26 detect each side of the own vehicle based on the front image generated by the image generating unit 11 and the first detection information generated by the first information generating unit 12 to generate the second detection information. Specifically, the second information generating units 21, 22, 23, 24, 25 and 26 may include at least one radar and / or camera device arranged on the own vehicle, and may detect the position and speed of the vehicle located on the side of the own vehicle or capture an image. Here, the second information generating units 21, 22, 23, 24, 25 and 26 may be arranged on each of the front corners, side mirrors, and rear center and rear corners of the own vehicle.

[0672] At least one information generating unit in these vehicle camera systems may be equipped with an optical system and a camera module having the optical system as described in the above-mentioned embodiments, and may provide or process information acquired through the front, rear, each side or corner areas of the vehicle to a user to achieve autonomous driving or protect the vehicle and objects from surrounding safety impacts.

[0673] The optical system of the camera module according to the embodiment of the present invention can be installed in multiple units in the vehicle to enhance safety regulation, autonomous driving functions and increase convenience by using an advanced driver assistance system (ADAS). In addition, the optical system of the camera module is used in the vehicle as a component for controlling, for example, a lane keeping assist system (LKAS), a lane departure warning system (LDWS), and a driver monitoring system (DMS). This vehicle camera module can achieve stable optical performance even under changes in ambient temperature, and can provide a module with competitive price, thereby ensuring the reliability of vehicle components.

[0674] The features, structures, effects, etc. described in the embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to one embodiment. In addition, the features, structures, effects, etc. shown in each embodiment can be combined or modified by a person skilled in the art to which the embodiments belong for other embodiments. Therefore, the contents related to such combinations and modifications should be interpreted as being included in the scope of the present invention. In addition, although the embodiments have been described above, they are merely examples and do not limit the present invention, and a person skilled in the art to which the present invention belongs has illustrated the above within the scope of the essential features of the present embodiments. It can be seen that various modifications and applications that have not yet been made are possible. For example, each component specifically shown in the embodiments can be realized by modification. And the differences associated with these modifications and applications should be interpreted as being included in the scope of the present invention defined in the appended claims.

Claims

1. An optical system, comprising: The first lens to the seventh lens are aligned along the optical axis from the object side toward the sensor side, Among them, the refractive power of the first lens is negative. Among them, the composite refractive power of the second lens to the seventh lens is positive, Among them, the refractive power of the seventh lens is negative. wherein the first lens is a spherical lens having the largest center thickness among the center thicknesses of the first lens to the seventh lens, and Wherein, the center thickness of the first lens is greater than the optical axis distance from the center of the object-side surface of the fifth lens to the center of the sensor-side surface of the sixth lens.

2. The optical system according to claim 1, wherein: An object-side surface of the fourth lens has a concave shape on the optical axis.

3. The optical system according to claim 1, wherein: The center thickness of the second lens is the smallest among the center thicknesses of the first to seventh lenses.

4. The optical system according to any one of claims 1 to 3, wherein: Starting from the object side, the center distance between the i-th lens and the i+1-th lens is CGi, the center thickness of the i-th lens is CTi, and the value of the following formula CTi / CGi is maximum when i is 1.

5. The optical system according to claim 4, wherein: The value of the following formula CTi / CGi is the smallest when i is 3.

6. The optical system according to claim 1, wherein: The effective diameter of the first lens is CA1, the effective diameter of the second lens is CA2, and the effective diameter of the third lens is CA3, and the following formula is satisfied: CA1 <CA2<CA3。 7. The optical system according to claim 6, wherein: The length from the center of the image sensor to the diagonal end is ImgH, the effective diameter of the fifth lens is CA5, the effective diameter of the sixth lens is CA6, the effective diameter of the seventh lens is CA7, and the optical system satisfies the following formula: CA4>CA5>CA6>(2*ImgH)>CA7.

8. The optical system according to any one of claims 1 to 3, wherein: The sensor-side surface of the fifth lens and the object-side surface of the sixth lens are bonded to each other.

9. The optical system according to claim 8, comprising: An aperture stop is arranged on the periphery between the first lens and the second lens.

10. The optical system according to claim 8, in, The object-side surface and the sensor-side surface of the third lens are aspherical on the optical axis, and Wherein, an object-side surface and a sensor-side surface of the seventh lens are aspherical on the optical axis.

11. The optical system according to claim 8, in, The first to seventh lenses are made of glass. The number of lenses whose object-side surfaces and sensor-side surfaces are spherical on the optical axis is at least twice the number of lenses whose object-side surfaces and sensor-side surfaces are aspherical.

12. An optical system according to any one of claims 1 to 3, in, The center thickness of the first lens is CT1, Wherein, the optical axis distance from the center of the object side surface of the first lens to the surface of the image sensor is TTL, Among them, the following formula is satisfied: 0.18≤CT1 / TTL≤0.

3.

13. An optical system according to any one of claims 1 to 3, in, The center thickness of the first lens is thicker than the center thickness of the cemented lens.

14. A camera module, comprising: Image sensor; first to seventh lenses aligned along the optical axis from the object side toward the sensor side; an aperture stop, wherein the aperture stop is arranged between the spherical lenses among the first lens to the seventh lens; as well as an optical filter, the optical filter being between the seventh lens and the image sensor, wherein the first lens has a meniscus shape convex toward the sensor on the optical axis, Among them, the first lens and the seventh lens have negative refractive power, Among them, the composite refractive power of the second lens to the seventh lens is positive, Among them, one of the first to fourth lenses is an aspherical lens, The aspherical lens is arranged between lenses having a shape in which both sides are convex on the optical axis.

15. The camera module according to claim 14, comprising a cemented lens in which two lenses having opposite refractive powers among the fifth to seventh lenses are cemented, in, The cemented lens includes an object-side lens that is convex on the optical axis and a sensor-side lens that is concave on the optical axis.

Images