Optical system and imaging device module

Abstract

An optical system disclosed in an 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 composite refractive power of the third to seventh lenses is positive, the first lens has a meniscus shape protruding from the optical axis toward the sensor side, and the second lens has a meniscus shape protruding from the object side toward the sensor side. A center distance between the first lens and the second lens is greater than a center thickness of each of the first to seventh lenses, the first to seventh lenses including a plurality of spherical lenses having an object-side surface and a sensor-side surface that are spherical at an optical axis, and a plurality of aspherical lenses having an object-side surface and a sensor-side surface that are spherical at the optical axis; the aspherical lens has an object-side surface and a sensor-side surface that are aspherical at the optical axis, and at least one from among the plurality of aspherical lenses may be made of a material different from a material of the spherical 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 same. 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. Then, after the target lane or target speed and the target ahead are determined, the vehicle's ESC (Electrical Stability Control), EMS (Engine Management System), MDPS (Motor Driven Power Steering), etc. are all controlled. Typically, ADAS can be implemented as an automatic parking system, a low-speed city driving assistance system, a blind spot warning system, etc.

[0003] The sensor devices used to sense the forward situation in ADAS are GPS sensors, laser scanners, front radars and laser radars, and the most representative devices are cameras for photographing the front, rear and sides of the vehicle. These cameras can be set outside or inside the vehicle to detect the surrounding environment of the vehicle. In addition, the camera can be set inside the vehicle to detect the situation of the driver and passengers. For example, the camera can photograph the driver at a position adjacent to the driver and detect the driver's health, whether he or she is sleepy, whether he or she is drinking, etc. In addition, the camera can photograph the passenger at a position adjacent to the passenger and detect the passenger's sleeping condition, health condition, etc., and provide information about the passenger to the driver.

[0004] In particular, the most important element for obtaining an image from a camera is an imaging lens that forms the image. Recently, interest in high definition and high resolution, etc. has been increasing, and research is being conducted on an optical system including a plurality of lenses to achieve this. However, there is a problem 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 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-mentioned problems are needed. Summary of the invention

[0005]

Technical issues

[0006] Embodiments may provide an optical system and a camera module in which a glass lens and a plastic lens are mixed. Embodiments may provide an optical system and a camera module in which a spherical lens and an aspherical lens are mixed. Embodiments provide an optical system and a camera module with improved optical characteristics. Embodiments provide an optical system and a camera module with excellent optical performance in low to high temperature environments. Embodiments provide an optical system and a camera module capable of preventing or minimizing changes in optical characteristics within various temperature ranges.

[0007]

Technical Solution

[0008] An 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 a refractive power of the first lens is negative, and a composite refractive power of the third lens to the seventh lens is positive, the first lens has a meniscus shape convex toward the sensor side on the optical axis, a center distance between the first lens and the second lens is greater than a center thickness of each of the first lens to the seventh lens, the first lens to the seventh lens include a plurality of spherical lenses and a plurality of aspherical lenses, wherein the spherical lens is a lens whose object side and sensor side surfaces are spherical on the optical axis, the aspherical lens is a lens whose object side and sensor side surfaces are aspherical on the optical axis, and at least one of the plurality of aspherical lenses may be made of a material different from that of the spherical lens.

[0009] According to an embodiment of the present invention, the number of spherical lenses can be at least twice the number of aspherical lenses. At least one of the multiple aspherical lenses can be made of the same glass material as the spherical lenses, and at least another of the multiple aspherical lenses can be made of plastic material.

[0010] According to an embodiment of the present invention, the first to sixth lenses may be made of glass, and the seventh lens may be made of a plastic material. The second to sixth lenses may be spherical lenses, and the first lens and the seventh lens may be aspherical lenses. The effective diameter of the first lens may be greater than the effective diameter of each of the fourth to seventh lenses. An aperture stop is included on the periphery arranged between the second lens and the third lens, and the first lens may have a shape concave on both sides on the optical axis.

[0011] According to an embodiment of the present invention, the sensor side surface of the fourth lens and the object side surface of the fifth lens may be bonded. According to an embodiment of the present invention, 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 when i is 1, the value of CTi / CGi may be minimum, and when i is 3, the value of CTi / CGi may be maximum.

[0012] According to an embodiment of the present invention, the center distance between the first lens and the second lens may be greater than the sum of the center thicknesses of two adjacent lenses among the first lens to the seventh lens. The Abbe number of each of the first lens to the fourth lens may be 50 or more, and the lens having the largest refractive index among the first lens to the seventh lens may be the fifth lens.

[0013] An optical system according to an embodiment of the present invention includes: a first lens group having lenses of a first material aligned along an optical axis side from an object side toward a sensor; and a second lens group having lenses of a second material arranged on a sensor side of the lenses of the first material and aligned along the optical axis, wherein the number of lenses of the first material is at least twice the number of lenses of the second material, a first lens in the first lens group closest to the object has a convex object-side surface and a concave sensor-side surface, and the first lens has positive refractive power, a last lens in the second lens group closest to the image sensor has a convex object-side surface and a concave sensor-side surface, and the last lens has negative refractive power, and the first material and the second material may be different materials.

[0014] According to an embodiment of the present invention, the first material is a glass material, the second material is a plastic material, the object side surface and the sensor side surface of the first lens have aspherical surfaces, and the object side surface and the sensor side surface of each of the lenses of the second material may have aspherical surfaces.

[0015] According to an embodiment of the present invention, the refractive index of the first lens is greater than 1.75, the optical axis distance from the center of the object side surface of the first lens to the image surface of the image sensor is TTL, and the optical axis distance from the center of the object side surface of the last lens to the image surface of the image sensor is BFL, and the following formula may be satisfied: <TTL / BFL<10。

[0016] According to an embodiment of the present invention, the optical axis distance from the center of the object side surface of the last lens to the image surface of the image sensor is BFL, and 1 / 2 of the diagonal length of the image sensor is ImgH, and the following formula may be satisfied: <BFL / ImgH<1.5。

[0017] According to an embodiment of the present invention, the effective focal length of the optical system is F, the optical axis distance from the center of the object side surface of the first lens to the image surface of the image sensor is TTL, the optical axis distance from the center of the object side surface of the last lens to the image surface of the image sensor is BFL, and the following formula 1 may be satisfied: 2≤TTL / F≤3, and the following formula 2 may be satisfied: 1 <F / BFL<3。

[0018] According to an embodiment of the present invention, the first lens group includes first to fifth lenses, the second lens group includes sixth to seventh lenses, the seventh lens is the last lens, and the focal length of the first lens may be greater than the composite focal length of the second to seventh lenses.

[0019] According to an embodiment of the present invention, the center thickness of the second lens is the largest among the center thicknesses of the first lens to the seventh lens, and the center distance between the first lens and the second lens is the largest among the center distances between adjacent lenses and may be greater than the center thickness of the second lens.

[0020] According to an embodiment of the present invention, a camera device module 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 a filter between the seventh lens and the image sensor, wherein the first lens and the seventh lens are made of the same material, the material of the lens arranged on the object side of the aperture stop is different from the material of the lens arranged on the sensor side of the aperture stop, the seventh lens has a negative refractive power, and a cemented lens arranged between the aperture stop and the image sensor is among the first lens to the seventh lens, wherein at least one of the lenses between the cemented lens and the image sensor may be an aspherical lens.

[0021]

Beneficial Effects

[0022] The optical system and the camera module according to the embodiment may have improved optical characteristics. Specifically, in the optical system according to the embodiment, a plurality of lenses may have set thickness, refractive power, and distance from adjacent lenses. Therefore, the optical system and the camera module according to the 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 peripheral portion of the field of view.

[0023] In addition, the optical system and the camera module according to the 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 power and refractive index. Therefore, even when the focal length of each lens changes due to changes in refractive index according to temperature changes, the lenses can compensate for 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 embodiment can maintain improved optical characteristics in various temperature ranges.

[0024] In addition, the optical system and the camera module according to the embodiment can meet the set field of view by mixing the aspherical lens and the spherical lens, and achieve excellent optical characteristics. Therefore, the optical system can provide a thinner vehicle camera module. Therefore, the optical system and the camera module can be provided to various applications and devices, and can have excellent optical characteristics even in a harsh temperature environment, such as when exposed to the outside or inside of a vehicle in high temperatures in summer. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a side cross-sectional view of an optical system and an image pickup device module having the optical system according to a first embodiment.

[0026] 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.

[0027] Figure 3 It is shown Figure 1 A table of lens characteristics of an optical system.

[0028] Figure 4 It is shown Figure 1 Table of aspheric coefficients of lenses in the optical system.

[0029] Figure 5 It is shown Figure 1 A table of the thickness of each lens in an optical system and the spacing between adjacent lenses.

[0030] 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.

[0031] 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.

[0032] Figure 8 Is to show about Figure 1 A graph of the diffraction MTF data of an optical system at low temperatures.

[0033] Fig. 9 Is to show about Figure 1 A graph of the diffraction MTF data of an optical system at high temperature.

[0034] Fig.10 Is to show about Figure 1 A graph of data of aberration characteristics of an optical system at room temperature.

[0035] Fig.11 Is to show about Figure 1 A graph showing the aberration characteristics of an optical system at low temperatures.

[0036] Fig.12 Is to show about Figure 1 A graph showing data on aberration characteristics of an optical system at high temperatures.

[0037] Fig.13 is a cross-sectional side view of an optical system and an image pickup device module having the optical system according to a second embodiment.

[0038] Fig.14 It is shown Fig.13 A table of lens characteristics of an optical system.

[0039] Fig.15 It is shown Fig.13 Table of aspheric coefficients of lenses in the optical system.

[0040] Fig.16 It is shown Fig.13 A table of the thickness of each lens in an optical system and the spacing between adjacent lenses.

[0041] Fig.17 It shows that according to Fig.13 Table of CRA data at room temperature, low temperature, and high temperature for the location of the image sensor in the optical system.

[0042] Fig.18 Is to show about Fig.13 A graph of the diffraction MTF data of an optical system at room temperature.

[0043] Fig.19 Is to show about Fig.13 A graph of data of aberration characteristics of an optical system at room temperature.

[0044] Fig. 20 : is a graph showing relative illuminance according to the height of the image sensor according to the first embodiment and the second embodiment.

[0045] Fig.21 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.

[0046] Fig. 22 It is used to explain the Fig.21 A side cross-sectional view showing the relationship between the nth lens and the n-1th lens.

[0047] Fig.23 It is shown Fig.21 A table of lens characteristics of an optical system.

[0048] Fig.24 It is shown Fig.21 Table of aspheric coefficients of lenses in the optical system.

[0049] Fig.25 It is shown Fig.21 A table of the thickness of each lens in an optical system and the spacing between adjacent lenses.

[0050] Fig.26 It is shown Fig.21 A table of sag values ​​(Sagvalue) of the object side surface and the sensor side surface of the lens of the optical system.

[0051] Fig. 27 It shows that according to Fig.21 Table of CRA data at room temperature, low temperature, and high temperature for the location of the image sensor in the optical system.

[0052] Fig.28 Is to show about Fig.21 A graph of the diffraction MTF data of an optical system at room temperature.

[0053] Fig.29 Is to show about Fig.21 A graph of the diffraction MTF data of an optical system at low temperatures.

[0054] Fig.30 Is to show about Fig.21 A graph of the diffraction MTF data of an optical system at high temperature.

[0055] Fig.31 Is to show about Fig.21 A graph of data of aberration characteristics of an optical system at room temperature.

[0056] Fig.32 Is to show about Fig.21 A graph showing the aberration characteristics of an optical system at low temperatures.

[0057] Fig.33 Is to show about Fig.21 A graph showing data on aberration characteristics of an optical system at high temperatures.

[0058] Fig.34 is a graph showing relative illuminance according to the height of the image sensor according to the third embodiment.

[0059] Fig.35 It is shown Fig. 22 Graphs of sag values ​​on the object side and sensor side of the sixth lens and the seventh lens.

[0060] Fig.36 is an example of a vehicle having an optical system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0061] 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 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 according to the meanings 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 based on the contextual meaning of the relevant technology.

[0062] 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 properties, sequence or process of the corresponding constituent elements by the terms. 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 "connected", "coupled" or "engaged" by another component between the component and another component. In addition, in the case of being described as being formed or arranged on "above (up)" or "below (below)" of each component, the description includes 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 from the description of any one of the several embodiments.

[0063] 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 in the optical axis or paraxial region, and the concave surface of the lens may mean a concave shape in the optical axis or 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 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, there may be a measurement error of up to ±0.4mm in the size of the effective diameter of the lens surface. 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.

[0064] Figure 1 is a side cross-sectional view of the optical system and the camera module according to the first embodiment. Fig.13 is a side cross-sectional view of an optical system and an image pickup device module according to a second embodiment. Fig.21 is a side cross-sectional view of an optical system and an imaging device module according to a third embodiment. Figure 1 , Fig.13 and Fig.21 , the optical system 1000 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 optical system 1000 may include n lenses, wherein 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 9. 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, for example, may be greater than 2 times or greater than 3 times the number of lenses of the first lens group LG1. In the first embodiment and the third embodiment, the number of lenses of the second lens group LG2 may be greater than 4 times or greater than 5 times the number of lenses of the first lens group LG1.

[0065] The first lens group LG1 may include at least one lens. The first lens group LG1 may have 3 or less lenses. The first lens group LG1 may preferably have 1 or 2 lenses. The second lens group LG2 may include three or more lenses or four lenses, and preferably, the second lens group LG2 may include five or six lenses.

[0066] The combined focal length of the first lens group LG1 may be defined as F_LG1, and the combined focal length of the second lens group LG2 may be defined as F_LG2, and the following condition may be satisfied: F_LG2 < F_LG1. In the first embodiment, the first lens group LG1 may be two lenses adjacent to the object, and the second lens group LG2 may be lenses other than the lenses of the first lens group LG1. In the second and third embodiments, the first lens group LG1 may be one lens adjacent to the object, and the second lens group LG2 may be lenses other than the lenses of the first lens group LG1.

[0067] The first lens group LG1 may include an aspherical lens and a spherical lens. The second lens group LG2 may include a plurality of spherical lenses and at least one aspherical lens. The first lens group LG1 may include a glass lens. The first lens group LG1 may set the lens closest to the object as a glass lens. The amount of expansion change and contraction change of this glass material due to external temperature changes is smaller than that of a plastic material, and the surface of this glass material is not easily scratched, thereby preventing surface damage. The second lens group LG2 may include at least one glass lens and at least one plastic lens. The second lens group LG2 may include three or more glass lenses and at least one plastic lens, for example, four glass lenses and one plastic lens. The lens closest to the image sensor 300 in the optical system 1000 may be made of plastic. As another example, the second lens group LG2 may include two or more plastic lenses, for example, two to three plastic lenses. Additionally, lenses made of plastic may be effective in improving thinness and optical characteristics. The lens closest to the object in the first lens group LG1 may be set as an aspherical lens made of glass. Therefore, the lens close to the outside in the lens barrel may be set as a glass lens. Among the lenses in the second lens group LG2, one or two lenses closest to the image sensor 300 may be set as plastic lenses or aspherical lenses. An aspherical lens is a lens whose object-side surface and sensor-side surface are aspherical, and a spherical lens is a lens whose object-side surface and sensor-side surface are spherical. That is, at least one aspherical lens close to the image sensor 300 can compensate for various aberrations. The aspherical lens can prevent spherical aberration within the optical system 1000, and since aberration does not occur even when the effective diameter increases, it is possible to miniaturize and lighten the imaging device module. The aspherical lens may be made of a glass mold material or a plastic mold material. For example, the second lens group LG2 may include a lens made of a glass material and a plastic mold lens.

[0068] In the first and second embodiments, among the lenses of the optical system 1000, the lens with the maximum Abbe number may be located in the first lens group LG1, the lens with the maximum refractive index may be located in the second lens group LG2, the maximum Abbe number may be 60 or more, and the maximum refractive index may be greater than 1.7. In the third embodiment, the lens with the maximum Abbe number may be located in the second lens group LG2, the lens with the maximum refractive index may be located in the first lens group LG1, the maximum Abbe number may be 65 or more, and the maximum refractive index may be 1.75 or more. The lens with the maximum Abbe number may reduce dispersion, while the lens with the maximum refractive index may increase the dispersion of incident light. In addition, the lens with the maximum refractive index may be positioned closer to the image sensor or the sensor side than the lens with the maximum Abbe number.

[0069] In the optical system 1000, the lens with the largest effective diameter may be a lens close to the object side, or one of the lenses between the two lenses on the object side and the two lenses on the sensor side. The lens with the largest effective diameter is a glass lens and may be positioned closest to the object. The effective diameter of each lens may be the diameter of the effective area where effective light is incident from each lens, and is the average of the effective diameter of the object side surface and the effective diameter of the sensor side surface. An embodiment of the present invention may reduce the weight of the camera module, provide lower manufacturing costs, and suppress degradation of optical properties due to temperature changes by further mixing aspheric lenses in the optical system 1000. Various types of plastic lenses may replace glass lenses in the optical system, and lens surfaces such as aspheric or free-form surfaces may be easily polished and processed.

[0070] Each lens in the lens may include an effective area and an ineffective area. The effective area may be an area through which light incident on each lens in the lens passes. In other words, the effective area may be defined as an effective area or effective diameter in which the incident light is refracted to achieve optical properties. The ineffective area may be arranged around the effective area. The ineffective area may be an area in which effective light is not incident from a plurality of lenses. That is, the ineffective area may be an area that is unrelated to the optical properties. In addition, the end of the ineffective area may be an area fixed to a lens barrel (not shown) that houses the lens. The lens barrel contacts a lens of a first material, or contacts lenses of different first and second materials and may be made of a plastic material or a metal material. The lenses of the first material are aligned sequentially from the object along the optical axis OA, and three or less lenses of the second material may be arranged on the sensor side of the lens of the first material along the optical axis. The first material is a glass material, and the second material is a plastic material.

[0071] Within the optical system 1000, the TTL (Total Track Length or Total Top Length) can be more than twice ImgH, for example, greater than twice but less than 15 times. Preferably, the following condition can be satisfied: 4 < TTL / ImgH ≤ 10. The TTL is the distance on the optical axis OA from the center of the object-side surface of the first lens to the surface of the image sensor 300. The ImgH is half of the maximum diagonal length of the image sensor 300. Within the optical system 1000, the effective focal length (EFL) is set to 10 mm or more, and the diagonal FOV is set to less than 45 degrees, so that the optical system can be set as a standard optical system in a vehicle camera device module. For example, the optical system and the camera device module according to the embodiment can be applied to the camera device module of an ADAS (Advanced Driving Assistance System) provided inside or outside the vehicle.

[0072] In the optical system 1000, there is the following condition: TTL / (2*ImgH) can be 2.5 or more or 2.7 or more, for example, in the range of 2.5 to 5, 2.5 to 4.7, or 3 to 5. By setting the value of TTL / (2*ImgH) to 2.5 or more, the optical system 1000 can provide a vehicle lens optical system. The total number of lenses in the first lens group LG1 and the second lens group LG2 is 9 or less or 8 or less. Therefore, for the formed image, the optical system 1000 can provide an image that is not exaggerated or distorted.

[0073] In the first and second embodiments, the number of lenses in the optical system 1000 having an effective diameter greater than the length of the image sensor 300 can exceed 50% of the total number of lenses. Preferably, the number of lenses having an effective diameter less than the length of the image sensor 300 can be 40% or less than 40% of the total number of lenses, for example, in the range of 10% to 40%. In the third embodiment, the number of lenses in the optical system 1000 having an effective diameter greater than the length of the image sensor 300 can be 70% or more, and the number of lenses having an effective diameter less than the length of the image sensor 300 can be less than 30% of the total number of lenses. At least one or all of the aspherical lenses in the optical system 1000 can have an effective diameter less than the length of the image sensor 300. The length of the image sensor 300 is the maximum length of the diagonal in the direction orthogonal to the optical axis OA.

[0074] The effective diameter of the lens closest to the object side in the lens sections 100, 100A, and 100B may be larger than the effective diameter of the lens closest to the image sensor 300. In addition, the effective diameters of the lens arranged on the object side of the aperture stop ST and the lens arranged on the sensor side of the aperture stop ST may be larger than the diagonal length of the image sensor 300. In the lens sections 100, 100A, and 100B, the object side aspherical lens may have an effective diameter larger than the diagonal length of the image sensor 300, and the sensor side aspherical lens may have an effective diameter smaller than the diagonal length of 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 incident light to compensate for the degradation of resolution and optical characteristics due to temperature changes, improve chromatic aberration control characteristics, and improve the vignetting characteristics of the optical system 1000.

[0075] At least one cemented lens 145, 145A, and 134 may be included in the optical system 1000. The cemented lenses 145, 145A, and 134 may be lenses in which two lenses having different focal lengths are bonded. The cemented lenses 145, 145A, and 134 have an object side lens and a sensor side lens bonded, and the effective diameter of the object side lens of the cemented lenses 145, 145A, and 134 may be larger than or smaller than the effective diameter of the sensor side lens. For example, in the first and second embodiments, the effective diameter of the object side lens of the cemented lenses 145 and 145A may be larger than the effective diameter of the sensor side lens, the effective diameter of the object side lens of the cemented lenses 145 and 145A may be larger than the length of the image sensor 300, and the effective diameter of the sensor side lens may be set within the range of ±110% of the diagonal length of the image sensor 300. In the third embodiment, the effective diameter of the lens arranged on the object side based on the cemented lens 134 may be larger than the length of the image sensor 300. The object-side lens 104 and the sensor-side lens 105 of the cemented lens 134 may be longer than the length of the image sensor 300 .

[0076] The cemented lenses 145, 145A and 134 may be spherical lenses. The cemented lenses may be bonded using a transparent resin material. The effective diameter of the lens arranged closer to the object based on the cemented lenses 145, 145A and 134 may be greater than the length of the image sensor 300. At least one lens surface among the lenses arranged closer to the sensor based on the cemented lenses 145, 145A and 134 may have an effective diameter less than the length of the image sensor 300. The cemented lenses 145, 145A and 134 may be disposed between spherical lenses in the optical system.

[0077] On the optical axis OA, the first lens group LG1 and the second lens group LG2 can have a set distance. The optical axis distance between the first lens group LG1 and the second lens group LG2 in the direction of the optical axis OA can be the optical axis distance between the sensor-side surface of the lens closest to the sensor side among the lenses in the first lens group LG1 and the object-side surface of the lens closest to the object side among the lenses in the second lens group LG2. In the first and second embodiments, the optical axis distance between the first lens group LG1 and the second lens group LG2 can be 0.5 times or less of the optical axis distance of the first lens group LG1. For example, it can be in the range of 0.01 times to 0.5 times of the optical axis distance of the first lens group LG1. In the first and second embodiments, the optical axis distance between the first lens group LG1 and the second lens group LG2 can be 0.3 times or less of the optical axis distance of the second lens group LG2, and can be, for example, in the range of 0.01 times to 0.3 times of the optical axis distance of the second lens group LG2. In the third embodiment, the optical axis distance between the first lens group LG1 and the second lens group LG2 can be 0.5 times or less of the optical axis distance of the second lens group LG2, and can be, for example, in the range of 0.1 times to 0.5 times. 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 of the second lens group LG2 and the sensor-side surface of the lens closest to the image sensor 300. In the first and second embodiments, the two lens surfaces facing each other in the region between the first lens group LG1 and the second lens group LG2 can have a shape in which the sensor-side surface of the object-side lens is concave and the object-side surface of the sensor-side lens is convex. Differently, the two surfaces facing each other can have a shape in which the sensor-side surface of the object-side lens is convex and the object-side surface of the sensor-side lens is concave on the optical axis. In the third embodiment, in the region between the first lens group LG1 and the second lens group LG2, the two lens surfaces facing each other, for example, the sensor-side surface of the object-side lens can be concave, and the object-side surface of the sensor-side lens can be concave. The first lens group LG1 can refract the light incident from the object side for focusing, and the second lens group LG2 can refract the light emitted to the image sensor 300 through the first lens group LG1.

[0078] The first lens group LG1 may have a positive (+) refractive power, and the second lens group LG2 may have a positive (+) refractive power. In the first and second embodiments, the first lenses 101 and 111 closest to the object in the first lens group LG1 may have a negative (-) refractive power, and in the third embodiment, the first lens 121 may have a positive refractive power. Among the lenses in the second lens group LG2, the lens closest to the image sensor may have a negative (-) refractive power. In addition, the composite focal length F27 of the second lens to the seventh lens may have a positive (+) value.

[0079] When the focal length is expressed as an absolute value, in the first and second embodiments, the focal length of the first lens group LG1 may be 1.5 times or more of the focal length of the second lens group LG2, for example, 1.5 times to 5 times the focal length of the second lens group LG2. In the third embodiment, the focal length of the first lens group LG1 may be 5 times or more of the focal length of the second lens group LG2, for example, 5 times to 15 times. The EFL of the optical system 1000 may be smaller than the focal length of the first lens group LG1, and the difference with the focal length of the second lens group LG2 may be less than 5. In the first to third embodiments, the EFL may be smaller than the absolute value of the focal length of the first lens group LG1. The EFL of the optical system 1000 may be smaller than the absolute value of the focal length of the second lens group LG2.

[0080] The lens sections 100, 100A and 100B may be a mixture of spherical lenses and aspherical lenses. The number of aspherical lenses may be less than 50% of the total number of lenses, and may be in the range of 10% to 40%. The number of lenses with negative (-) refractive power in the lens sections (100, 100A) of the first and second embodiments may be less than the number of lenses with positive (+) refractive power, for example, the number of lenses with negative (-) refractive power may be less than 50% of the total number of lenses, and may be in the range of 20% to 45%. In the lens 100B of the third embodiment, the number of lenses with negative (-) refractive power on the optical system 1000 may be greater than the number of lenses with positive (+) refractive power. The number of lenses with negative (-) refractive power may be 50% or more of the total number of lenses, and may be in the range of 50% to 70% or 50% to 65%.

[0081] In the first and second embodiments, when expressed in absolute values ​​of focal length, the average value of the focal length of the spherical lens may be less than the average value of the focal length of the aspherical lens. The average value of the refractive index of the aspherical lens may be less than the average value of the refractive index of the spherical lens. In addition, the average value of the effective diameter of the spherical lens may be greater than the average value of the effective diameter of the aspherical lens. Therefore, when two or more aspherical lenses are arranged in the camera module, the weight of the camera module can be reduced and the optical characteristics can be improved. Since the first lenses 101 and 111 closest to the object are arranged to have a higher Abbe number and a lower refractive index than the second lenses 102 and 112, the distance between the first lens and the second lens can be increased. In addition, since the nth lens adjacent to the image sensor 300 is arranged to have a lower Abbe number and a higher refractive index than the n-1th lens, dispersion can be improved at a position near the image sensor 300.

[0082] In the lens section 100B of the third embodiment, when the focal length is an absolute value, the focal length of the lens closest to the object can be smaller than the focal length of the last lens. The absolute value of the focal length of the last lens can be the largest in the optical system and can be larger than the focal length F_LG1 of the first lens group LG1. When the focal length of the last lens is F7, the following conditions can be satisfied: F_LG1 <F7。

[0083] The lens portion 100B may include a lens of a first material and a lens of a second material different from the first material. The first material may be a glass material, and the second material may be a plastic material. The lens of the first material may be adjacent to the object and aligned along the optical axis, and the lens of the second material may be adjacent to the image sensor 300 and aligned along the optical axis. The lens of the first material may be defined as a first material group, and the lens of the second material may be defined as a second material group. The number of lenses of the first material group may be 1.5 times or more, for example, 2 times or more, of the number of lenses of the second material group. The lens of the first material may have an average center thickness greater than the average center thickness of the lens of the second material. The lens of the first material may have an average refractive index greater than the average refractive index of the lens of the second material. In addition, the lens of the first material may have an average effective diameter greater than the average effective diameter of the lens of the second material. The lens of the first material may include a lens having a spherical surface and a lens having an aspherical surface. The lens of the second material may include a lens having an aspherical surface. The optical system 1000 may correct various aberrations according to temperature changes by mixing lenses of glass materials and plastic materials, and may reduce the weight of the camera module.

[0084] In the first to third embodiments of the present invention, the sum of the refractive indices of the lenses of the lens portions 100, 100A, and 100B is 8 or more, 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 1.70 or in the range of 1.60 to 1.72. The sum of the Abbe numbers of the lenses in the lens may be 220 or more, for example, in the range of 220 to 400 or 270 to 390, 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 center thickness of the entire lens may be 15 mm or more, for example, in the range of 15 mm to 35 mm, 15 mm to 30 mm, or 20 mm to 30 mm. The average value of the center thickness of the entire lens may be 5 mm or less, for example, in the range of 2.8 mm to 4 mm or 2.8 mm to 5 mm. On the optical axis OA, the sum of the center distances between the lenses may be 4 mm or more, for example, in the range of 4.5 mm to 10 mm or 4 mm to 20 mm, and may be less than the sum of the center thicknesses of the lenses. In addition, the average value of the effective diameter of each lens surface of the lens portions 100, 100A, and 100B may be set to 8 mm or more, for example, in the range of 8 mm to 15 mm.

[0085] The F number of the optical system or camera module according to the first to third embodiments of the present invention may 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. The maximum field of view (diagonal angle) in the optical system according to the embodiment of the present invention may be 50 degrees or less, for example, in the range of 20 to 50 degrees, 20 to 55 degrees, or 25 to 40 degrees. The vehicle optical system may 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 to 35 degrees. In addition, the vertical field of view is set to an angle less than the horizontal field of view, and may be less than 20 degrees, for example, in the range of 10 to 20 degrees. At this time, the sensor length in the horizontal direction Y may be 8.064 mm ± 0.5 mm, and the sensor height in the vertical direction X may be 4.54 mm ± 0.5 mm. The horizontal field of view FOV_H is an angle based on the horizontal length of the sensor. Therefore, it is possible to suppress changes in the focal position due to temperature changes, and provide a vehicle imaging device that well corrects various aberrations.

[0086] The optical system 1000 or the camera module may include an image sensor 300. The image sensor 300 may detect light and convert it into an electrical signal. The image sensor 300 may detect light that passes through the lens portions 100, 100A, and 100B sequentially. 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). Here, the number of lenses having an effective diameter greater than the length of the image sensor 300 is 5 to 6, and the number of lenses having an effective diameter less than the length of the image sensor 300 may be 1 or 2.

[0087] The optical system 1000 or the camera module may include a filter 500. The filter 500 may be disposed between the second lens group LG2 and the image sensor 300. The filter 500 may be disposed between the lens closest to the sensor side among the lenses of the lens portions 100, 100A, and 100B and the image sensor 300. For example, the optical systems 100, 100A, and 100B may be disposed between the last lens and the image sensor 300.

[0088] 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 deteriorated. The cover glass 400 can be removed. The optical filter 500 may include an infrared filter or an infrared cut filter (IR cut). The optical filter 500 may allow light of a set wavelength band to pass through and filter light of different wavelength bands. When the optical filter 500 includes an infrared filter, it may prevent radiant heat emitted from external light from being transmitted to the image sensor 300. In addition, the optical filter 500 may transmit visible light and reflect infrared light.

[0089] The optical system 1000 according to the embodiment may include an aperture stop ST. The aperture stop ST may adjust the amount of light incident on the optical system 1000. The aperture stop ST may be provided between any two lenses of the lens sections 100, 100A, and 100B. In a lens arranged between an object and the aperture stop ST, the effective diameter of the lens tends to decrease as it goes from the object side to the aperture stop ST. In a lens arranged between the aperture stop ST and the image sensor 300, the effective diameter of the lens tends to decrease as it goes from the aperture stop ST to the sensor side. "The effective diameter of the lens tends to decrease as it goes from the aperture stop ST to the sensor side" means that for the lens arranged between the aperture stop ST and the image sensor 300, the effective diameter of the lens decreases as it goes from the aperture stop ST to the sensor side, and at least one lens surface may be larger than the object side lens surface. As in the embodiment of the present invention, for the lens arranged between the aperture stop ST and the image sensor, the effective diameter of the lens increases and then decreases as it goes from the aperture stop ST to the sensor side.

[0090] The first lenses 101, 111, and 121 and the second lenses 102, 112, and 122 may be disposed on the object side of the aperture stop ST, and the third lenses 103, 113, and 123 and the fourth lenses 104, 114, and 124 may be disposed on the sensor side of the aperture stop ST. When the above aperture stop ST is arranged on the sensor side surface of the second lenses 102, 112, and 122, the following condition is satisfied: effective diameter of the object side surface of the first lens > effective diameter of the sensor side surface of the first lens > effective diameter of the object side surface of the second lens. The following condition is satisfied: effective diameter of the sensor side surface of the second lenses 102 and 112 > effective diameter of the object side surface of the third lens > effective diameter of the sensor side surface of the fourth lens.

[0091] The aperture stop ST may be set at a set position. The aperture stop ST may be set on the periphery of the object side surface or the sensor side surface of any one of the lenses of the first lens group LG1. For example, the aperture stop ST may be set on the periphery of the sensor side surface of the sensor side lens of the first lens group LG1, that is, on the periphery of the sensor side surface of the second lens 102. As another example, the aperture stop ST may be set around the object side surface or the sensor 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 set around the object side surface or the sensor side surface of the object side lens of the first lens group LG1. Alternatively, at least one lens selected from a plurality of lenses may be used as an aperture. 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 an aperture for controlling the amount of light.

[0092] Since the embodiment is an optical system applied to a vehicle camera device, an aspherical lens and a spherical lens can be used together, and the first lens closest to the object side can be provided by a glass material. This has the following advantages: compared with plastic materials, glass materials are scratch-resistant and insensitive to external temperatures. In order to more effectively prevent scratches caused by foreign substances or placed inside the vehicle, the first lens can be made of glass, and the object side surface of the first lens can have a concave shape so as not to contact the external structure. If the object side surface of the first lens is designed to have a convex shape, scratches may occur due to contact with the external structure. In order to monitor the driver while driving, take photos of the front / rear of the vehicle, or detect lanes and objects around the vehicle, the field of view can be greater than 20 degrees and less than 40 degrees, for example in the range of 25 degrees to 35 degrees. The horizontal field of view can be a preset angle for an advanced driver assistance system.

[0093] 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.

[0094] Will refer to Figures 1 to 12 An optical system according to a first embodiment of the present invention is described. Figures 1 to 3 , the optical system 1000 according to the first embodiment includes a lens portion 100, and the lens portion 100 may include first to seventh lenses 101 to 107. The first to seventh lenses 101 to 107 may be sequentially arranged along the optical axis OA. Light corresponding to information about an object may pass through the first to seventh lenses 101 to 107 and the filter 500, and be incident on the image sensor 300. The first lens 101 and the second lens 102 may be a first lens group LG1, and the third to seventh lenses 103, 104, 105, 106, and 107 may be a second lens group LG2. The first lens 101 is a lens closest to the object. The seventh lens 107 is a lens closest to the image sensor 107.

[0095] The first lens 101 may have a positive (+) refractive power or a negative (-) refractive power on the optical axis OA. The first lens 101 may have a negative (-) refractive power. The first lens 101 may include a plastic material or a glass material, and may be, for example, a glass material. The first lens 101 made of a glass material may reduce changes in the center position and the radius of curvature due to temperature changes according to the surrounding environment, and may protect the incident side surface of the optical system 1000. On the optical axis, the object side first surface S1 of the first lens 101 may have a concave shape, and the sensor side second surface S2 may have a concave shape. The first lens 101 may have a shape with both sides concave on the optical axis. Alternatively, the first surface S1 may have a convex shape on the optical axis OA, and the second surface S2 may have a concave shape. Alternatively, the first lens 101 may have a convex meniscus shape on the sensor side on the optical axis OA. The first lens 101 may be set to an aspherical lens made of glass. The aspherical coefficients of the first surface S1 and the second surface S2 may be set to Figure 4 The effective radius of the first surface S1 of the first lens 101 may be greater than the effective radius of the object side surface and the sensor side surface of the second lens 102 to the seventh lens 107. Since the first surface S1 is concave and the second surface S2 has a concave shape, the incident light is refracted in a direction close to the optical axis OA, and the distance between the first lens 101 and the second lens 102 may be set farther. The first surface S1 of the first lens 101 may be set 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 101 may be set to have no critical point.

[0096] 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 (+) refractive power or a 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 material or a glass material. For example, the second lens 102 may be made of glass. The object-side third surface S3 of the second lens 102 may be convex on the optical axis OA, and the sensor-side fourth surface S4 may have a convex shape. The second lens 102 may have a shape convex on both sides on the optical axis OA. Alternatively, the second lens 102 may have a meniscus shape convex toward the object side. Alternatively, the third surface S3 may be concave, and the fourth surface S4 may have a convex shape. In contrast, the second lens 102 may have a concave shape on both sides. The second lens 102 may be set 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 disposed to have no critical point from the optical axis OA to the end of the effective area.

[0097] 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 material or a glass material. For example, the third lens 103 may be made of glass. Based on the optical axis, the object-side fifth surface S5 of the third lens 103 may have a convex shape, and the sensor-side sixth surface S6 may have a convex shape. The third lens 103 may have a shape convex on both sides on the optical axis. Alternatively, the third lens 103 may have a meniscus shape convex toward the sensor side or toward the object side. Alternatively, the third lens 103 may have a shape concave on both sides on the optical axis. The third lens 103 may be set as a spherical lens made of glass. The fifth surface S5 and the sixth surface S6 may be spherical. At least one or both of the fifth surface S5 and the sixth surface S6 may be set to have no critical point from the optical axis OA to the end of the effective area.

[0098] The aperture stop ST may be provided around the sensor-side surface of the second lens 102. Alternatively, the aperture stop ST may be provided around the periphery of the object-side surface or the sensor-side surface of the first lens 101, or around the object-side surface of the second lens 102. The composite focal length of the second lens 102 to the seventh lens 107 may have a positive value, and the TTL within the field of view may be reduced. The object-side second lens 102 and the sensor-side third lens 103 of the aperture stop ST may have a shape with both sides convex on the optical axis. Therefore, the center distance between the second lens 102 and the third lens 103 may be reduced. In addition, due to the shape of the third lens 103, the center distance between the third lens 103 and the fourth lens 104 may also be reduced. Since the third lens 103 adjacent to the sensor side of the above aperture stop ST has a positive refractive power (F3>0), the third lens 103 may refract the incident light in the optical axis direction, and the increase in the effective diameter of the sensor-side or rear-side lens of the third lens 103 may be suppressed. Therefore, the weight yield of the optical system can be prevented from decreasing by the third lens 103, and production efficiency can be improved. Here, the composite focal length of the third lens 103 to the seventh lens 107 arranged on the sensor side of the aperture stop ST can have a positive value, and TTL within the field of view can be reduced.

[0099] 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 material or a 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 have a convex shape on the optical axis, and the sensor-side eighth surface S8 may have a concave shape. The fourth lens 104 may have a meniscus shape convex toward the object side. Alternatively, the fourth lens 104 may have a shape convex on both sides or a meniscus shape convex toward the sensor side on the optical axis OA. Alternatively, the seventh surface S7 may have a concave shape on the optical axis OA, and the eighth surface S8 may have a concave shape on the optical axis OA. The fourth lens 104 may have a meniscus shape convex toward the object 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 disposed to have no critical point from the optical axis OA to the end of the effective area.

[0100] 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 negative (-) refractive power. The fifth lens 105 may include a plastic material or a glass material. For example, the fifth lens 105 may be made of glass. With respect to the optical axis OA, the object-side ninth surface of the fifth lens 105 may have a convex shape, and the sensor-side tenth surface S10 may have a concave shape. The fifth lens 105 may have a meniscus shape convex toward the object side on the optical axis OA. Alternatively, the fifth lens 105 may have a meniscus shape convex toward the sensor side. Alternatively, the ninth surface may have a convex shape on both sides on the optical axis OA. In contrast, the fifth lens 105 may have a shape concave on both sides on the optical axis. The ninth surface and the tenth surface S10 of the fifth lens 105 may be spherical. At least one or both of the ninth surface and the tenth surface S10 may be set to have no critical point from the optical axis OA to the end of the effective area.

[0101] The fourth lens 104 and the fifth lens 105 may be bonded and may be defined as a cemented lens 145. The bonding surface between the fourth lens 104 and the fifth lens 105 may be defined as an eighth surface S8. The eighth surface S8 may be the same surface as the ninth surface of the fifth lens 105. When the distance between the fourth lens 104 and the fifth lens 105 is G4, G4 may be less than 0.01 mm. The distance G4 between the fourth lens 104 and the fifth lens 105 from the optical axis OA to the end of the effective area may be less than 0.01 mm. The fourth lens 104 and the fifth lens 105 may have opposite refractive powers. The composite refractive power of the fourth lens 104 and the fifth lens 105 may have a negative (-) refractive power.

[0102] When the combined refractive power of the cemented lens 145 is F45, the combined refractive power of the first lens 101 and the second lens 102 is F12, and the combined refractive power of the second lens 102 to the seventh lens 107 is F27, the following conditions can be satisfied in absolute value: F27 < F45 < F12. The product of the refractive power of the fourth lens 104 and the refractive power of the fifth lens 105 of the cemented lens 145 can be less than 0. The product of the focal length of the fourth lens 104 and the focal length of the fifth lens 105 of the cemented lens 145 can be less than 0. Therefore, the aberration characteristics of the optical system can be improved. If the refractive powers of the two lenses of the cemented lens 145 are the same, there are limitations to the improvement of aberration. The combined refractive power of the cemented lens 145 can have a negative refractive power, and based on the cemented lens 145, the third lens 103 near the object side and the sixth lens 106 near the sensor side can have positive refractive powers. Therefore, the third lens 103, the cemented lens 145, and the sixth lens 106 can refract some incident light in the optical axis direction and compensate for various aberrations.

[0103] The effective diameter of the fourth lens 104 can be greater than the effective diameter of the fifth lens 105 and can be greater than the diagonal length of the image sensor 300. The effective diameter of the fourth lens 104 is the average of the effective diameters of the seventh surface S7 and the eighth surface S8. The effective diameter of the fifth lens 105 can be less than the effective diameter of the fourth lens 104 and can have a length within ±110% or ±105% of the diagonal length of the image sensor 300. Preferably, the effective diameter of the fifth lens 105 can be greater than the diagonal length of the image sensor 300, for example, it can be 110% or less or 105% or less of the diagonal length of the image sensor 300.

[0104] The effective diameter of the eighth surface S8 of the fifth lens 105 can be greater than the diagonal length of the image sensor 300, and the effective diameter of the tenth surface S10 can be less than the diagonal length of the image sensor 300.

[0105] When the fifth lens 105 and the sixth lens 106 are spherical lenses, the difference between the effective diameter of the object-side seventh surface S7 and the effective diameter of the sensor-side tenth surface S10 of the cemented lens 145 can be set as large as possible within the lens unit 100. When the effective diameters of the ninth surface of the fifth lens 105 and the sensor-side tenth surface S10 are set as CA51 and CA52, the following conditions are satisfied: CA51 > CA52, and the difference between CA51 and CA52 can be the largest among the effective diameter differences between the object-side surface and the sensor-side surface of each lens. Additionally, when the effective diameters of the seventh surface S7 of the fourth lens 104 and the sensor-side eighth surface S8 are set as CA41 and CA42, the following conditions can be satisfied: CA41 > CA42. Therefore, by having the fifth lens 105 with a relatively small effective diameter and a concave sensor-side surface, an increase in the effective diameters of the sixth lens 106 and the seventh lens 107 can be prevented.

[0106] Since the cemented lens 145 is joined with spherical glass lenses having different refractive indices, and at least one lens located on the sensor side with respect to the cemented lens 145 is positioned as an aspherical lens, spherical aberration can be compensated by the aspherical lens. Additionally, since at least one or two or more of the lenses located on the sensor side with respect to the cemented lens 145 are aspherical lenses and have a small effective diameter, light can be refracted by the aspherical lens to the entire area of the image sensor 300. When the refractive index of the fourth lens 104 is Nd4, the refractive index of the fifth lens 105 is Nd5, the Abbe number of the fourth lens 104 is Vd4, and the Abbe number of the fifth lens 105 is Vd5, the following conditions can be satisfied: Nd5 * Vd5 < Nd4 * Vd4.

[0107] When the radius of curvature of the object-side seventh surface S7 of the cemented lens 145 is L4R1, and the radius of curvature of the sensor-side tenth surface S10 of the cemented lens 145 is L5R2, the following conditions can be satisfied: |L4R1 - L5R2| < 10 mm, and preferably: |L4R1 - L5R2| ≤ 6 mm. The shapes of the object-side surface and the sensor-side surface of the cemented lens 145 have a meniscus shape that bulges toward the object side on the optical axis, and by setting the difference in the radius of curvature between the object-side surface and the sensor-side surface to be small, the amount of incident light can be increased, and the emitted light can be guided to the effective area of the sixth lens 106 with a small effective diameter. When the refractive index of the fifth lens 105 is Nd5 and the Abbe number is Vd5, and the refractive index of the first lens 101 is Nd1 and the Abbe number is Vd1, the following conditions can be satisfied: Nd1 < Nd5, and Nd5 * Vd5 < Nd1 * Vd1.

[0108] 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 positive (+) refractive power. The sixth lens 106 may include a plastic material or a glass material. For example, the sixth lens 106 may be made of a glass material. With respect to the optical axis OA, the object-side eleventh surface S11 of the sixth lens 106 may be convex, and the sensor-side twelfth surface S12 may be concave. The sixth lens 106 may have a meniscus shape convex toward the object side on the optical axis OA. Alternatively, the sixth lens 106 may have a meniscus shape convex toward the sensor side or a double convex shape. Alternatively, the sixth lens 106 may have a double concave shape. The eleventh surface S11 and the twelfth surface S12 may be spherical. The eleventh surface S11 and the twelfth surface S12 of the sixth lens 106 may be arranged such that there is no critical point from the optical axis OA to the end of the effective area. Since the object-side surface and the sensor-side surface of the sixth lens 106 are arranged such that there is no critical point, the effective diameter of the seventh lens 107 may not increase. Additionally, due to the sixth lens 106, the difference between the effective diameter of the seventh lens 107 and the diagonal length of the image sensor 300 may not be large. When the effective diameter of the object-side eleventh surface S11 of the sixth lens 106 is CA61 and the effective diameter of the sensor-side twelfth surface S12 of the sixth lens 106 is CA62, the following condition may be satisfied: CA62 < CA61. If the radius of curvature of the object-side eleventh surface S11 of the sixth lens 106 is L6R1 and the radius of curvature of the sensor-side twelfth surface S12 of the sixth lens 106 is L6R2, the following condition may be satisfied: CA61 * L6R1 < CA62 * L6R2. The central thickness of the sixth lens 106 may be greater than the central thickness of the seventh lens 107, and the refractive index may be reduced to suppress chromatic dispersion.

[0109] 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 material or a glass material. For example, the seventh lens 107 may be made of a plastic material. The object-side thirteenth surface S13 of the seventh lens 107 may have a convex shape on the optical axis, and the sensor-side fourteenth surface S14 may have a concave shape. The seventh lens 107 may have a meniscus shape convex toward the object side on the optical axis. Alternatively, the thirteenth surface S13 may have a concave shape on the optical axis OA, and the fourteenth surface S14 may have a convex shape. Alternatively, the seventh lens 107 may have a concave shape on both sides. The seventh lens 107 may be made of a plastic material and may have aspherical surfaces on both sides. The thirteenth surface S13 and the fourteenth surface S14 have aspherical surfaces, and the aspherical coefficient may be set to Figure 4L7S1 and L7S2. The seventh lens 107 may be an aspherical lens closest to the image sensor 300. By arranging the aspherical lens closest to the image sensor 300, a reduction in optical performance can be prevented, aberration characteristics can be improved, and the influence on resolution can be controlled. In addition, by arranging the aspherical lens as the lens closest to the image sensor 300, the aspherical lens may be less sensitive to assembly tolerances compared to a spherical lens. In other words, being less sensitive to assembly tolerances means that even if there are slight differences between the assembly and the design during the assembly process, the optical performance may not be significantly affected.

[0110] In the sixth lens 106, if the maximum Sag value of the object-side surface is Sag61 and the maximum Sag value of the sensor-side surface is Sag62, the following condition can be satisfied: 0 < Sag61 - Sag62 < 0.7 mm. Therefore, the thickness difference between the center and the edge of the sixth lens 106 is not large, and the influence on the optical characteristics can be suppressed. In the case where the maximum Sag value of the object-side surface of the seventh lens 107 is Sag71 and the maximum Sag value of the sensor-side surface is Sag72, the following condition can be satisfied: 0 < |Sag71| - |Sag72| < 0.4 mm. Therefore, since the thickness difference between the center and the edge of the seventh lens 107 is not large and the radius of curvature is also not large, the influence on the optical characteristics can be suppressed. Since the first lens 101 and the seventh lens 107 are arranged as aspherical lenses, deterioration of the optical performance can be prevented, the number of lenses can be reduced, and the TTL of the optical system can be decreased.

[0111] Referring to Figure 2 , at least one or both of the thirteenth surface S13 and the fourteenth surface S14 of the seventh lens 107 may have critical points. 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. Since the thirteenth surface S13 and the fourteenth surface S14 of the seventh lens 107 have critical points, light can be provided to the entire area of the image sensor 300. The critical point of the thirteenth surface S13 may be located at a position 2.2 mm or less from the optical axis OA, for example, in the range of 1.5 mm to 2.2 mm. As another example, the thirteenth surface S13 may be set to have no critical points. 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 position 2 mm or more from the optical axis OA, for example, in the range of 2 mm to 2.8 mm. Since the critical point of the fourteenth surface S14 is positioned closer to the edge relative to the optical axis than the critical point of the thirteenth surface S13, the fourteenth surface S14 can refract light to the periphery of the image sensor 300.

[0112] The BFL (Back Focal Length) is the optical axis distance from the surface of the image sensor 300 to the center of the sensor side surface of the last lens. A tangent line K1 passing through an arbitrary point on the fourteenth surface S14 of the seventh lens 107 and a normal line K2 perpendicular to the tangent line K1 may have a predetermined angle θ1 with the optical axis OA. The maximum tangent angle θ1 along the first direction X on the fourteenth surface S14 may be 45 degrees or less, for example, within the range of 5 degrees to 45 degrees or within the range of 15 degrees to 35 degrees. CT7 is the center thickness of the seventh lens 107, and ET7 is the edge thickness of the seventh lens 107. CT6 is the center thickness of the sixth lens 106, and ET6 is the edge thickness of the sixth lens 106. The edge thickness is the distance in the optical axis direction between the object side surface and the sensor side surface at the end of the effective area of each lens. CG6 is the optical axis distance (i.e., the 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 in the optical axis direction from the edge of the sixth lens 106 to the edge of the seventh lens 107 (i.e., the edge distance). The center thickness of the cemented lens 145 is CT45, and CT45 is the optical axis distance from the center of the object side surface of the fourth lens 104 to the center of the sensor side surface of the fifth lens 105. The edge thickness of the cemented lens 145 is ET45, and ET45 is the optical axis distance from the edge of the object side surface of the fourth lens 104 to the edge of the sensor side surface of the fifth lens 105.

[0113] If the Sag value of the object side surface of the fourth lens 104 is Sag41, the Sag value of the sensor side surface of the fifth lens 105 is Sag51, the Sag value of the object side surface of the sixth lens 106 is Sag61, the Sag value of the sensor side surface of the sixth lens 106 is Sag62, the Sag value of the object side surface of the seventh lens 107 is Sag71, and the Sag value of the sensor side surface of the seventh lens 107 is Sag72, then the absolute values satisfy the following conditions: Max_Sag52 < Max_Sag41, satisfy the following conditions: Max_Sag61 < Max_Sag52, and may satisfy the following conditions: Max_Sag72 < Max_Sag71 < Max_Sag52 < Sag41. In this way, by adjusting the lens surfaces from the center to the edge of the fifth lens 105 to the seventh lens 107, the incident light can be guided to the entire area of the image sensor 300. Here, the Max_Sag value is the maximum distance in the optical axis direction from a straight line perpendicular to the center of the object side surface or the sensor side surface of each lens to the lens surface, and when the Sag value is located on the object side surface rather than the center, it may have a negative value, and when the Sag value is located on the sensor side surface rather than the center, it may have a positive value.

[0114] Figure 3 yes Figure 1 Examples of lens data for an optical system of an embodiment of the present invention. Figure 3 As shown, the radius of curvature on the optical axis OA of the first lens 101 to the seventh lens 107, the center thickness CT of each lens, the center distance CG between adjacent lenses, the refractive index in the d-line, the Abbe number, and the size of the effective radius (semi-aperture) can be set. When the radius of curvature of each lens is expressed as an absolute value on the optical axis, the radius of curvature of the eighth surface S4 of the fourth lens 104 on the optical axis OA can be the largest among the lenses, and the radius of curvature of the tenth surface S10 of the fifth lens 105 can be the smallest among the lenses. The difference between the maximum radius of curvature and the minimum radius of curvature can be 10 times or more, for example, 15 times or more.

[0115] When the radius of curvature of each lens on the optical axis is expressed as an absolute value, the radius of curvature of the first lens 101 on the optical axis may be smaller than the radius of curvature of the second lens 102 arranged on the sensor side of the aperture stop ST and the radius of curvature of the third lens 103 arranged on the object side. Here, the radius of curvature is the average value of the absolute values ​​of the radius of curvature of the object side surface and the sensor side surface of each lens. The absolute value of the radius of curvature of the object side surface of the i-th lens is Roi, the absolute value of the radius of curvature of the sensor side surface is Rsi, and the absolute value of the average value of the object side surface and the sensor side surface is Ri, and the value of (Roi-Rsi) / Ri may be the smallest when i is 6 and the largest when i is 3. Here, when i is 6 or 7, the value of (Roi-Rsi) / Ri may be 0.5 or less. Therefore, the difference in the radius of curvature of the object side surface and the sensor side surface of the plastic seventh lens 107 may be smaller than the difference in the radius of curvature of the object side surface and the sensor side surface of the first lens 101 to the fifth lens 105.

[0116] The radius of curvature of the sixth lens 106 on the optical axis may be smaller than the radius of curvature of the first lens 101. Since the sixth lens 106 is spherical and the radius of curvature is set to be smaller than the radius of curvature of the first lens 101, the entire area may be provided with uniform light distribution. The radius of curvature of the seventh lens 107 on the optical axis may be smaller than the radius of curvature of the first lens 101. Since the seventh lens 107 is aspherical and the radius of curvature is set to be smaller than the radius of curvature of the first lens 101, the entire area may be provided with uniform light distribution.

[0117] The absolute value of the radius of curvature of the object side surface of the i-th lens is Roi, the absolute value of the radius of curvature of the sensor side surface is Rsi, and the absolute value of the average value of the object side surface and the sensor side surface is expressed as Ri, and the value of Roi / Rsi can be maximum when i is 5 and minimum when i is 3.

[0118] The radii of curvature of the first surface S1 and the second surface S2 of the first lens 101 are defined as L1R1 and L1R2, the radii of curvature of the thirteenth surface S13 and the fourteenth surface S14 of the seventh lens 107 are defined as L7R1 and L7R2, and the radii of curvature of the corresponding lens surfaces of the second lens 102 to the sixth lens 106 can be defined as L2R1, L2R2, L3R1, L3R2, L4R1, L4R2 (L5R1), L5R2, L6R1, and L6R2. The ratio of the radius of curvature of the object-side surface to the radius of curvature of the sensor-side surface of each lens can satisfy the following conditions:

[0119] Condition 1: 1.5 < |L1R1 / L1R2| < 3, Condition 2: 0 < |L2R1 / L2R2| < 0.5

[0120] Condition 3: 0 < L3R1 / L3R2 < 0.2, Condition 4: 0 < L4R1 / L4R2 < 0.3

[0121] Condition 5: 10 < L5R1 / L5R2 < 30, Condition 6: 0 < L6R1 / L6R2 < 1

[0122] Condition 7: 1 < L7R1 / L7R2 < 2.2

[0123] If the central thicknesses of the first lens 101 to the seventh lens 107 are defined as CT1 to CT7, and the edge thicknesses of the first lens 101 to the seventh lens 107 are defined as ET1 to ET7, then the sum of the central thicknesses of the first lens 101 to the seventh lens 107 can be defined as ∑CT, and the sum of the edge thicknesses of the first lens 101 to the seventh lens 107 can be defined as ∑ET. When describing 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 102 to the seventh lens 107, and can have the maximum thickness within the lens unit 100. The central thickness CT7 of the seventh lens 107 can be the smallest within the lens unit 100, and can satisfy the following conditions: CT7 < CT4 < CT6 < CT1. The ratio of the central thickness to the edge thickness of each lens can satisfy the following conditions.

[0124] Condition 1: 0.6 < CT1 / ET1 < 1.2, Condition 2: 1 < CT2 / ET2 < 2

[0125] Condition 3: 1.2 < CT3 / ET3 < 2.5, Condition 4: 1.5 < CT4 / ET4 < 3

[0126] Condition 5: 0 < CT5 / ET5 < 1.2, Condition 6: 0.6 < CT6 / ET6 < 2

[0127] Condition 7: 0.4 < CT7 / ET7 < 1.2, Condition 8: 0.5 < ∑CT / ∑ET < 1.2 or 1 < ∑CT / ∑ET < 1.2

[0128] Through the above conditions, the difference between the center thickness and the edge thickness of each lens can be effectively guided not to increase. 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, in the range of 3 mm to 5 mm. That is to say, even if the center thickness of the last aspherical lens is set thin, the optical performance will not deteriorate, and the thickness of the imaging device module can also be set thin.

[0129] The relationship between the center of each lens and TTL can satisfy the following conditions.

[0130] Condition 1: 0.10 < CT1 / TTL < 0.3, preferably, Condition 1: 0.10 ≤ CT1 / TTL ≤ 0.2 can be satisfied.

[0131] Condition 2: 0 < CT2 / TTL < 0.1, Condition 3: 0 < CT3 / TTL < 0.09

[0132] Condition 4: 0 < CT4 / TTL < 0.1, Condition 5: 0 < CT5 / TTL < 0.1

[0133] Condition 6: 0.05 < CT6 / TTL < 0.2, Condition 7: 0 < CT7 / TTL < 0.07

[0134] The ratio of CT1 / TTL in Condition 1 can be greater than the values of Conditions 2 to 7. The center thickness CT1 of the first lens 101 can be greater than the sum of the center thicknesses of the adjacent second lens and third lens.

[0135] The relationship between the cemented lens 145 and the first lens 101 and the sixth lens 106 can satisfy the following conditions. Condition 1: 0.4 < CT1 / CT45 < 1.2 or 0.4 < CT1 / CT45 < 1

[0136] Condition 2: 1 < CT1 / CT6 < 1.8, Condition 3: 0.1 < CT1 / ∑CT < 0.4

[0137] Condition 4: 0.10 < CT45 / ∑CT < 0.3, Condition 5: 0.15 < CT6 / ∑CT < 0.35

[0138] ∑CT is the sum of the center thicknesses of the lenses, and CT45 is the sum of the center thicknesses of the fourth lens and the fifth lens. By setting the center thicknesses and edge thicknesses of the first lens 101 to the seventh lens 107 to the above conditions, the light can be guided to the optimal path according to the refractive index, Abbe number, and curvature radius of each lens in the optical system 1000.

[0139] The center distances between the first lens 101 and the seventh lens 107 are defined as CG1 to CG6, and the sum of the center distances between the first lens 101 and the seventh lens 107 can be defined as ∑CG. Here, the center distances between the lenses other than the distances between two lenses in the cemented lens are described. The center distance CG1 between the first lens 101 and the second lens 102 is the largest, and the center distance CG3 between the third lens 103 and the fourth lens 104 is the smallest. The center distance between a spherical lens and an aspherical lens is greater than the center distance between spherical lenses. The center thickness of each lens and the center distance between adjacent lenses can satisfy the following conditions. Condition 1: 0 < CT1 / CG1 < 1, Condition 2: 2 < CT2 / CG2 < 10, Condition 3: 5 < CT3 / CG3 < 20, Condition 4: 4 < CT45 / CG5 < 12, Condition 5: 0.5 < CG1 / ∑CG < 1

[0140] By setting the maximum center thickness between the lenses to be less than the maximum center distance, an imaging device module applying an aspherical lens to the output side of the optical system can be provided without increasing the center distances of other lenses. The center distance CG1 between the first lens 101 and the second lens 102 can be greater than the sum of the center thicknesses of two adjacent lenses. Additionally, the center distance CG1 between the first lens 101 and the second lens 102 can satisfy the following conditions: CT2 + CT3 + CT4 < CG1, CT3 + CT4 + CT5 < CG1, CT4 + CT5 + CT6 < CG1, and CT5 + CT6 + CT7 < CG1. The center distance CG1 between the first lens 101 and the second lens 102 can be 1.5 times or more the center thickness of the cemented lens 145. Since the center distance CG1 between the first lens 101 and the second lens 102 satisfies the conditions, the optical characteristics of the second lens 102 to the seventh lens 107 can be easily controlled. 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, excluding the center thickness of the cemented lens and the distance between the cemented lenses). CGi is the center distance between the i-th lens and the i+1-th lens. The ratio of CTi / CGi can be the smallest when i is 1 and the largest when i is 3.

[0141] Regarding the effective diameter, the lens with the largest effective diameter can be the first lens 101 closest to the object. The first lens 101 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, such as the seventh lens 107. The effective diameters of the first lens 101 to the seventh lens 107 can 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 can be defined as CA11 and CA12, the effective diameters of the thirteenth surface S13 and the fourteenth surface S14 of the seventh lens 107 can be defined as CA71 and CA72, and the effective diameters of the object-side surfaces and the sensor-side surfaces of the second lens to the sixth lens can be defined as CA21, CA22, CA31, CA32, CA41, CA42, CA51, CA52, CA61, and CA62. The effective diameters can satisfy the following conditions.

[0142] Condition 1: CA22 < CA12, Condition 2: CA71 < CA72, Condition 3: CA31 < CA22, and Condition 4: CA61 < CA51 < CA41

[0143] If the refractive index is described, the refractive index of the fifth lens 105 is the largest among the lenses and can be greater than 1.70, such as 1.75 or greater. The refractive index of the first lens 101 is the smallest among the lenses. The difference between the largest refractive index and the smallest refractive index can be greater than 0.20, such as 0.25 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.

[0144] If the Abbe number is described, the Abbe number of the first lens 101 is the largest among the lenses and can be 55 or greater. The Abbe numbers of the first lens 111 to the fourth lens 114 are 50 or greater, and the difference between them can be 10 or less. The Abbe number of the seventh lens 107 is the smallest among the lenses. The difference between the largest Abbe number and the smallest Abbe number can be 30 or greater. The Abbe numbers of the third lens 103 and the fourth lens 104 adjacent to the aperture stop ST are made greater than the Abbe number of the fifth lens 105, and the Abbe number of the seventh aspherical lens 107 closest to the image sensor 300 is made the smallest, so as to control the dispersion of the light traveling between the glass lenses and increase the dispersion between the spherical lens and the aspherical lens to guide the light to the image sensor 300.

[0145] If the average effective diameter of the spherical lens is SSL_CA_Aver, and the average effective diameter of the aspherical lens is ASL_CA_Aver, the following condition can be satisfied: ASL_CA_Aver < SSL_CA_Aver. The average value of the center thickness of the spherical lens is SSL_CT_Aver, and if the average value of the center thickness of the aspherical lens is ASL_CT_Aver, the following condition can be satisfied: SSL_CT_Aver < ASL_CT_Aver.

[0146] The average value of the refractive index of the spherical lens is SSL_Nd_Aver, and if the average value of the refractive index of the aspherical lens is ASL_Nd_Aver, the following condition can be satisfied: ASL_Nd_Aver < SSL_Nd_Aver.

[0147] The average value of the Abbe number of the spherical lens is SSL_Ad_Aver, and if the average value of the Abbe number of the aspherical lens is ASL_Ad_Aver, the following condition can be satisfied: ASL_Ad_Aver < SSL_Ad_Aver.

[0148] The focal lengths F1, F5, and F7 of the first lens 101, the fifth lens 105, and the seventh lens 107 can have negative refractive powers, and the focal lengths F2, F3, F4, and F6 of the second lens 102, the third lens 103, the fourth lens 104, and the sixth lens 106 can have positive refractive powers. Additionally, the sixth lens 106 and the seventh lens 107, which are adjacent lenses, can satisfy the following conditions.

[0149] Condition 1: The refractive index of the lens with positive refractive power < the refractive index of the lens with negative refractive power

[0150] Condition 2: The dispersion value of the lens with positive refractive power > the dispersion value of the lens with negative refractive power

[0151] Here, since the sixth lens 106 has positive refractive power and the seventh lens 107 has negative refractive power, according to Condition 1 and Condition 2, the refractive index of the sixth lens 106 is less than that of the seventh lens 107, and the dispersion value of the sixth lens 106 is greater than that of the seventh lens 107. The chromatic aberration occurring in the fourth lens and the fifth lens can be corrected by the seventh lens with an aspherical surface. Additionally, by satisfying that the refractive index difference between the sequentially arranged sixth lens 106 and seventh lens 107 is 0.2 or less, and the Abbe number difference is 20 or greater and 60 or less, the chromatic aberration occurring in the spherical lens can be compensated by the aspherical lens.

[0152] The optical system 1000 generates chromatic aberration, and the chromatic aberration is corrected by using a cemented lens 145 or two lenses arranged in series. As the temperature changes from low to high, the lens repeatedly contracts and expands. Since the lens characteristics of the lenses of the same material change by the same amount according to the temperature change, it is effective to correct the chromatic aberration between the lenses of the same material even when the temperature changes. By using the fourth lens 104, the fifth lens 105, the sixth lens 106, and the seventh lens 107, the chromatic aberration between the spherical lens and the aspherical lens can be mutually corrected. The refractive index difference between the fourth lens 104 and the fifth lens 105 as cemented lenses satisfies 0.01 or more and 0.30 or less, and the Abbe number difference satisfies 20 or more and 45 or less, and the chromatic aberration generated in the spherical lens can be compensated by the spherical lens. The refractive index difference is rounded to the third decimal place, and the Abbe number difference is rounded to the first decimal place, and these values ​​are compared. In addition, by arranging a glass lens having a relatively high Abbe number on the object side of the seventh lens 107 having an aspherical surface, dispersion can be reduced by the glass lens, and dispersion can be increased by the last aspherical lens.

[0153] When the focal length is expressed as an absolute value, the focal length of the first lens 101 may be 40 or more. The focal length of the fifth lens 105 is the smallest among the lenses. The focal length of the seventh lens 107 is the largest among the lenses and is 65 or more. The difference between the maximum focal length and the minimum focal length may be 55 or more. By maximizing the focal length of the lens closest to the sensor and setting the focal length of the joined fifth lens 105 to the minimum, improved MTF characteristics, aberration control characteristics, resolution characteristics, etc. can be achieved within the set field of view in the optical system, and good optical performance can be achieved in the peripheral part of the field of view. The sensor-side surface of the seventh lens 107 has a Sag value that increases from the optical axis to a point of 2.4 mm ± 0.4 mm in a direction perpendicular to the optical axis, and then decreases from the point of 2.4 mm ± 0.4 mm toward the edge. If there is a critical point on the sensor-side surface of the seventh lens 107, that is, the sensor side of the last lens, that is, the lens surface closest to the sensor, TTL can be reduced, thereby facilitating miniaturization and weight reduction of the optical system.

[0154] like Figure 4As shown, among the lenses of the lens unit 100 in the first embodiment, the lens surfaces of the first lens 101 and the seventh lens 107 may include aspheric surfaces having a 30th-order aspheric coefficient. For example, the first lens 101 and the seventh lens 107 may include lens surfaces 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 periphery, the optical performance of the peripheral portion of the field of view (FOV) can be well corrected. Figure 5 As shown, the thicknesses T1 to T7 of the first lens 101 to the seventh lens 107 and the distances G1 to G6 between two adjacent lenses may be set. Figure 5 As shown, the thickness T1 to T7 of each lens in the Y-axis direction perpendicular to the optical axis can be represented by an interval of 0.1 mm or 0.2 mm or more from the optical axis, and the interval G1 to G6 between each lens can be represented by an interval of 0.1 mm or 0.2 mm or more from the optical axis.

[0155] The center thickness CT45 of the cemented lens 145 may be greater than the edge thickness ET45. The center thickness CT45 of the cemented lens 145 is the distance from the center of the object-side seventh surface S7 of the fourth lens 104 to the center of the tenth surface S10 of the fifth lens 105 in the optical axis direction, and the edge thickness ET45 is the distance from the end of the effective area of ​​the seventh surface S7 to the tenth surface S10 in the optical axis direction. The maximum thickness of the cemented lens 145 is at the center, the minimum thickness is at the edge, and the maximum thickness may be at least 1 times the minimum thickness, for example, in the range of 1 to 1.5 times. The maximum thickness of the sixth lens 106 is at the center, the minimum thickness is at the edge, and the maximum thickness may be at most 1.5 times the minimum thickness. The maximum thickness of the seventh lens 107 is at the edge, the minimum thickness is at the center, and the maximum thickness may be at most 1.5 times the minimum thickness.

[0156] like Figure 6 As shown, in Figure 1 In the optical system and camera module of the present invention, the chief ray angle (CRA) 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. 20 As shown, the graph showing the relative illumination according to the image height in the optical system according to the embodiment shows that according to the temperature change of room temperature (Room_temp), low temperature (Low_temp) and high temperature (High_tmep), the relative illumination from the center to the diagonal end of the image sensor is 80% or more, for example, 84% or more. That is, it can be seen that the difference in relative illumination according to the temperature change is almost the same at a distance of 4.6 mm from the optical axis.

[0157] Figures 7 to 9It is shown Figure 1 Graphs of diffraction MTF (Modulation Transfer Function) 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 the first embodiment of the present invention, the deviation of the MTF between the low temperature and the high temperature based on the room temperature may be less than 10%, that is, 7% or less.

[0158] 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 shown in the figure. 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 12 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 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 a wavelength band of about 546nm. Figures 10 to 12 In the aberration diagram, the closer each curve at room temperature, low temperature, and high temperature is to the Y-axis, the better the aberration correction function can be explained. It can be seen that the optical system 1000 according to the embodiment has measurement values ​​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 center of the FOV but also in the periphery. 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 can be in the range of 85 degrees or higher, for example, in the range of 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 hardly changes.

[0159] Table 1 compares the changes in optical characteristics such as EFL, BFL, F number, TTL and diagonal FOV at room temperature, low temperature and high temperature in the optical system according to the first embodiment, and it can be seen that the rate of change of the optical characteristics 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 characteristics at low temperature is 5% or less, for example, 3% and less, based on room temperature.

[0160] [Table 1]

[0161] Room temperature Low temperature high temperature Low temperature / room temperature (%) High temperature / room temperature (%) EFL 15.2 15.2 15.2 99.87％ 100.18％ BFL 2.6 2.6 2.6 99.88％ 100.14％ F# 1.6 1.6 1.6 100.00％ 100.00％ TTL 39 39 39 99.90％ 100.12％ FOV 24.1 24.2 24.1 100.11％ 99.86％

[0162] Therefore, as shown in Table 1, according to the temperature change from low temperature to high temperature, the change in optical characteristics (such as the rate of change of effective focal length (EFL), TTL, BFL, F number (F#), and diagonal FOV) is 10% or less, that is, 5% or less, for example, in the range of 0 to 5%. This means that even if at least one or two or more aspherical lenses are used, temperature compensation of the aspherical lenses can be designed to prevent the reliability of optical characteristics from deteriorating. In addition, it can be seen that even if the temperature changes from room temperature to low temperature or high temperature, the effective focal length, TTL, BFL, F number (F#), and diagonal FOV are almost unchanged. 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 the FOV but also in the peripheral part.

[0163] Will refer to Figures 13 to 18 An optical system according to a second embodiment of the present invention will be described. The configuration of the second embodiment will be described with reference to the first embodiment, and a configuration different from the first embodiment will be described. Fig.13 and Fig.14 , the optical system 1000 according to the second embodiment includes a lens portion 100A, and the lens portion 100A may include first to seventh lenses 111 to 117. The first and second lenses 111 and 112 may be a first lens group LG1, and the third to seventh lenses 113, 114, 115, 116, and 117 may be a second lens group LG2.

[0164] The first lens 111 may have a negative (-) refractive power and may be made of glass. Based on the optical axis, the first surface S1 of the object side of the first lens 111 may be concave, and the second surface S2 of the sensor side may have a concave shape. The first lens 111 is made of an aspherical glass material, has high transmittance and refractive index, and is provided with a thick thickness, thereby preventing the optical characteristics of the incident lens from being deteriorated and protecting the surface.

[0165] The second lens 112 may have a positive (+) refractive power on the optical axis OA and may be made of a spherical glass material. Based on the optical axis OA, the third surface S3 of the second lens 112 may be convex, and the fourth surface S4 may have a convex shape. The aperture stop ST may be disposed around the sensor side surface of the second lens 112. The third lens 113 may have a positive (+) refractive power on the optical axis OA and may include a glass material. Based on the optical axis, the object side fifth surface S5 of the third lens 113 may have a convex shape, and the sensor side sixth surface S6 may have a concave shape. The third lens 113 may be configured as a spherical lens made of glass.

[0166] The fourth lens 114 may have a positive (+) refractive power on the optical axis OA and may include a spherical glass material. Based on the optical axis, the object-side seventh surface S7 of the fourth lens 114 may be convex, and the sensor-side eighth surface S8 may have a concave shape. The fifth lens 115 may have a negative (-) refractive power on the optical axis OA and may be set to a spherical glass material. Based on the optical axis OA, the object-side ninth surface of the fifth lens 115 may be convex, and the sensor-side tenth surface S10 may have a concave shape. The fourth lens 114 and the fifth lens 115 may be bonded and defined as a cemented lens 145A. The fourth lens 114 and the fifth lens 115 may have opposite refractive powers. The composite refractive power of the fourth lens 114 and the fifth lens 115 may have a positive refractive power. When the composite refractive power of the cemented lens 145A is F45, the composite refractive power of the first lens 101 and the second lens 102 is F12, and the composite refractive power of the third lens 103 to the seventh lens 107 is F37, the absolute value may satisfy the following condition: F37 <F45<F12。

[0167] The effective diameter of the fourth lens 114 may be greater than the diagonal length of the image sensor 300. The effective diameter of the fifth lens 115 may be smaller than the effective diameter of the fourth lens 114, and may have a length within the range of ±110% of the diagonal length of the image sensor 300. For example, the effective diameter of the tenth surface S10 of the fifth lens 115 may be smaller than the diagonal length of the image sensor 300. Since the position of the cemented lens 145A is located between the spherical lenses, chromatic aberration correction by the seventh lens 117 may be more efficient.

[0168] The sixth lens 116 may have a positive (+) refractive power on the optical axis OA and may be provided by a glass material. With respect to the optical axis OA, the eleventh surface S11 of the sixth lens 116 on the object side may be convex, and the twelfth surface S12 on the sensor side may be concave. The sixth lens 116 may be made of glass and may have spherical surfaces on both sides. Since the eleventh surface S11 and the twelfth surface S12 are made of spherical glass, the light refraction efficiency can be improved, and the thickness can be increased to improve assemblability. In addition, the degradation of the optical characteristics of the sixth lens 116 made of glass with a thick thickness can be prevented by performing thermal compensation according to temperature changes. Since the sixth lens 116 is arranged between the spherical lens and the aspherical lens, it can prevent the degradation of the optical performance and control the influence on the aberration characteristics and the resolution improvement. The seventh lens 117 may have a negative (-) refractive power on the optical axis and may be set as an aspherical plastic lens. The object-side thirteenth surface S13 of the seventh lens 117 may have a convex shape on the optical axis, and the sensor-side fourteenth surface S14 may have a concave shape. The above seventh lens 117 may be made of a plastic material, and may have aspherical surfaces on both sides.

[0169] The first surface S1 and the second surface S2 of the first lens 111 and the thirteenth surface S13 and the fourteenth surface S14 of the seventh lens 117 have aspherical surfaces, and the aspherical coefficients may be set to Fig.15 L1, L7, S1, S2.

[0170] 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. The critical point of the thirteenth surface S13 may be located at a position less than or equal to 2.5 mm from the optical axis OA, for example, in the range of 1.7 mm to 2.5 mm. As another example, the thirteenth surface S12 may be set to have no critical point. 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. The critical point of the fourteenth surface S14 may be positioned closer to the edge than the critical point of the thirteenth surface S13, and may be located at a position greater than or equal to 2.5 mm from the optical axis OA, for example, in the range of 2.5 mm to 3.3 mm. Since the above fourteenth surface S14 and the above thirteenth surface S13 have critical points, they can refract incident light to the periphery of the image sensor 300. When the maximum Sag value of the object side surface of the seventh lens 117 is Sag71 and the maximum Sag value of the sensor side surface is Sag72, the following condition can be satisfied: 0<|Sag71|-|Sag72|<0.4mm. Therefore, since the thickness difference between the center and the edge of the seventh lens 117 is not large and the curvature radius is not large, the influence on the optical characteristics can be suppressed. Since the seventh lens 117 is arranged as a spherical lens, it is resistant to temperature changes, the number of lenses can be reduced, and the TTL of the optical system can be reduced.

[0171] Fig.14 yes Fig.13 Examples of lens data for an optical system of an embodiment of the present invention. Fig.14As shown, the radius of curvature of the first lens 111 to the seventh lens 117 on the optical axis OA, the central thickness CT of the lens, the central distance CG between adjacent lenses, the refractive index in the d-line, the Abbe number, and the size of the clear aperture CA can be set. The absolute value of the radius of curvature of the first lens 111 on the optical axis can be smaller than the absolute value of the radius of curvature of the second lens 112 arranged on the object side of the aperture stop ST. The absolute value of the radius of curvature of the object side surface of the i-th lens is Roi, the absolute value of the radius of curvature of the sensor side surface is Rsi, and the absolute value of the average of the object side surface and the sensor side surface is expressed as Ri, and the value of (Roi - Rsi) / Ri can be the smallest when i is 7 and the largest when i is 3. Here, when i is 6 or 7, the value of (Roi - Rsi) / Ri can be less than 1, for example, 0.8 or less. Therefore, there may be a difference between the radius of curvature of the object side surface and the sensor side surface of each of the plurality of aspherical lenses and the average value of the radius of curvature of each aspherical lens, and this difference is smaller than that of the spherical lens. Since the first lens 111 is set as an aspherical lens with a thick thickness, the radius of curvature of the first lens 111 on the optical axis can increase more than the radius of curvature of the sixth lens 116 and the seventh lens 117, and the difference between the radius of curvature of the object side surface and the sensor side surface may not be large, and the assemblability can be improved.

[0172] The radius of curvature of the seventh lens 117 on the optical axis can be smaller than the radius of curvature of the aspherical first lens 111. Therefore, the aspherical seventh lens 117 can guide the light incident through the first lens 111 to the fifth lens 115 to the entire area of the image sensor 300. The ratio of the radius of curvature of each lens can satisfy the following conditions.

[0173] Condition 1: 0 < |L1R1 / L1R2| < 1.2, Condition 2: 0 < |L2R1 / L2R2| < 0.5

[0174] Condition 3: 0 < L3R1 / L3R2 < 0.2, Condition 4: 0 < L4R1 / L4R2 < 0.3

[0175] Condition 5: 10 < L5R1 / L5R2 < 30, Condition 6: 0 < L6R1 / L6R2 < 1

[0176] Condition 7: 1 < L7R1 / L7R2 < 2.2

[0177] If the thickness of the lens is described, the central thickness CT6 of the sixth lens 116 can have the maximum thickness within the lens unit 100A. The central thickness CT1 of the first lens 111 can be greater than the central thicknesses of the second lens 112 to the fourth lens 114 and greater than the central thickness of the seventh lens 117. The central thickness CT7 of the seventh lens 117 can have the minimum thickness within the lens unit 100A. The central thickness CT1 of the first lens 111 can be less than the central thickness CT45 of the cemented lens 145A. The edge thickness ET1 of the first lens 111 can be less than the edge thickness ET45 of the cemented lens 145A. The central thickness and the edge thickness of each lens can satisfy the following conditions.

[0178] Condition 1: 0.6 < CT1 / ET1 < 1.2, Condition 2: 1 < CT2 / ET2 < 3

[0179] Condition 3: 1.3 < CT3 / ET3 < 3, Condition 4: 1.5 < CT4 / ET4 < 3

[0180] Condition 5: 0 < CT5 / ET5 < 1, Condition 6: 0.6 < CT6 / ET6 < 1.5

[0181] Condition 7: 0.3 < CT7 / ET7 < 1.2, Condition 8: 0.8 < ∑CT / ∑ET < 1.5 or 1 < ∑CT / ∑ET < 1.5

[0182] The central distance CG1 between the first lens 111 and the second lens 112 is the largest, and can be the central distance between the aspherical lens on the object side and the spherical lens on the sensor side. The central distance CG1 between the first lens 111 and the second lens 112 can be greater than the central distance between spherical lenses, and can be greater than the central distance between the spherical lens on the object side and the aspherical lens on the sensor side. The central distance CG6 between the sixth lens 116 and the seventh lens 117 can satisfy the following condition: CG6 < CG5 < CG1. The central thickness of each lens and the central distance between adjacent lenses can satisfy the following conditions.

[0183] Condition 1: 0 < CT1 / CG1 < 0.5, Condition 2: 2 ≤ CT2 / CG2 < 5

[0184] Condition 3: 5 < CT3 / CG3 < 15, Condition 4: 4 < CT45 / CG5 < 12

[0185] Condition 5: 0.5 < CG1 / ∑CG < 1

[0186] By setting the maximum center thickness between the lenses to be less than the maximum center distance, a camera device module that applies an aspherical lens to the output side of an optical system can be provided without increasing the center distance of other lenses. The center distance CG1 between the first lens 111 and the second lens 112 can be greater than the sum of the center thicknesses of two adjacent lenses. Additionally, the center distance CG1 between the first lens (111) and the second lens (112) can satisfy the following conditions: CT2 + CT3 + CT4 < CG1, CT3 + CT4 + CT5 < CG1, CT4 + CT5 + CT6 < CG1, and CT5 + CT6 + CT7 < CG1. The center distance CG1 between the first lens 111 and the second lens 112 can be 1.5 times or more the center thickness of the cemented lens 145. Since the center distance CG1 between the first lens 111 and the second lens 112 satisfies the above conditions, the optical characteristics of the second lens 112 to the seventh lens 117 can be easily controlled. Here, when the i-th center distance among the center distances of two adjacent lenses is defined as CGi, and the center thickness of the i-th lens arranged closer to the object than CGi is defined as CTi, the following conditions can be satisfied. (Here, the thickness of the cemented lens and the distance between the cemented lenses are not included)

[0187] The ratio of CTi / CGi is the smallest when i is 1 and can be the largest when i is 3.

[0188] The relationship between the center thickness of each lens and the TTL can satisfy the following conditions.

[0189] Condition 1: 0.01 < CT1 / TTL < 0.1, Condition 2: 0 < CT2 / TTL < 0.1

[0190] Condition 3: 0 < CT3 / TTL < 0.1, Condition 4: 0 < CT4 / TTL < 0.1

[0191] Condition 5: 0 < CT5 / TTL < 0.1, Condition 6: 0.1 < CT6 / TTL < 0.2

[0192] Condition 7: 0 < CT7 / TTL < 0.07

[0193] The ratio of CT1 / TTL in the above Condition 6 can be greater than the values of other conditions.

[0194] In terms of the effective diameter, the lens with the largest effective diameter can be the first lens 111. The first lens 111 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, such as the seventh lens 117. The effective diameter of each lens can satisfy the following conditions.

[0195] Condition 1: CA22 < CA12, Condition 2: CA71 < CA72, Condition 3: CA22 < CA31

[0196] Condition 4: CA61 < CA51 < CA41, Condition 5: CA4 < CA2 < CA1, Condition 6: CA5 < CA4 < CA3

[0197] In terms of refractive index, the refractive index of the fifth lens 115 is the largest among the lenses and can be greater than 1.70, for example, greater than 1.80. The refractive index of the first lens 111 is the smallest among the lenses. The difference between the maximum refractive index and the minimum refractive index can be greater than 0.20, for example, greater than 0.25. 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. When describing the Abbe number, the Abbe number of the first lens 111 is the largest among the lenses and can be 55 or greater. The difference between the Abbe numbers of the first lens 111 to the fourth lens 114 can be 10 or less. The Abbe number of the seventh lens 117 is the smallest among the lenses. The difference between the maximum Abbe number and the minimum Abbe number can be 30 or greater.

[0198] The optical system 1000 generates chromatic aberration and corrects the chromatic aberration by using a cemented lens 145A or two lenses laminated in series. As the temperature changes from low to high, the lens contracts and expands repeatedly. Since the lens characteristics of lenses made of the same material change by the same amount according to the temperature change, it is effective to correct the chromatic aberration between lenses made of the same material even when the temperature changes.

[0199] If the focal length is expressed as an absolute value, the focal length of the first lens 101 can be 40 or greater. The focal length of the seventh lens 117 is the largest among the lenses and can be 40 or greater. The focal length of the fifth lens 115 is the smallest among the lenses. The focal length difference between the first lens 111 and the seventh lens 117 can be 10 or less. The difference between the maximum focal length and the minimum focal length can be 35 or greater. By increasing the focal lengths of the first lens 111 closest to the object and the seventh lens 117 closest to the sensor and setting the focal lengths of the other lenses to be small, the optical system can have improved MTF characteristics, aberration control characteristics, resolution characteristics, etc. within the set field of view range, and can have good optical performance in the peripheral part of the field of view. The critical points and Sag values of the object-side surface and the sensor-side surface of the sixth lens 116 and the seventh lens 117 can include the description of the first embodiment.

[0200] As Fig.15 shown, among the lenses of the lens unit 100A in the second embodiment, the lens surfaces of the sixth lens 116 and the seventh lens 117 can include aspherical surfaces having an aspherical coefficient of the 30th order. As Fig.16As shown, the thicknesses T1 to T7 of the first lens 111 to the seventh lens 117 and the distances G1 to G6 between two adjacent lenses may be set. The center thickness CT45 of the cemented lens 145 may be greater than the edge thickness ET45. The center thickness CT45 of the cemented lens 145 is the distance from the center of the seventh surface S7 on the object side of the fourth lens 114 to the center of the tenth surface S10 of the fifth lens 115, and the edge thickness ET45 is the distance from the end of the effective area of ​​the seventh surface S7 to the tenth surface S10 in the optical axis direction. The maximum thickness of the cemented lens 145A is at the center, the minimum thickness is at the edge, and the maximum thickness may be 1.1 times or more of the minimum thickness, for example, in the range of 1.1 times to 2.5 times.

[0201] like Fig.17 As shown, Fig.13 The CRA in 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. 20 As shown, a graph showing the peripheral light ratio or peripheral illumination according to image height in an optical system according to an embodiment can be seen that, according to the temperature change between low temperature and high temperature, the peripheral light ratio is 70% or greater, for example, 75% or greater, from the center to the diagonal end of the image sensor. Fig.18 It is shown Fig.13 The graph of the diffraction MTF at room temperature in the optical system is a graph showing modulation according to the spatial frequency. In the second embodiment of the present invention, the deviation of the MTF at low or high temperature relative to room temperature can be less than 10%, that is, 7% or less. Fig.19 It is shown Fig.13 This is a graph showing the aberration characteristics of the optical system at room temperature. Fig.19 In the aberration graph of , spherical aberration (longitudinal spherical aberration), astigmatism field curve and distortion are measured from left to right. Fig.19 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 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 a wavelength band of about 546nm. Fig.19In the aberration diagram, it can be explained that the closer each curve is to the Y-axis at room temperature, the better the aberration correction ability. It can be seen that the optical system 1000 according to the embodiment has measured values close to the Y-axis in almost all regions. That is, the optical system 1000 according to the embodiment has improved resolution and can have good optical performance not only at the center of the FOV but also at the periphery. 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 can be 85 degrees or higher, for example, in the range of 85 degrees to 105 degrees. Therefore, it can be seen that Figures 10 to 12 the reduction in the luminance ratio (modulation) from low temperature to high temperature is less than 10%, for example, 5% or lower, or hardly changes. Therefore, it can be seen that due to the temperature change from low temperature to high temperature, the change rate of the optical characteristics (such as the change rates of the effective focal length (EFL), TTL, BFL, F-number, and diagonal FOV) of the optical system according to the second embodiment is 10% or less, that is, 5% or less, for example, in the range of 0 to 5%. This makes it possible to prevent the reliability of the optical characteristics from decreasing by designing so that even when using at least one or two or more aspherical lenses, temperature compensation can be performed on the aspherical lenses. 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 the FOV but also in the peripheral part.

[0202] The optical system 1000 according to the embodiment 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 on the optical axis OA and the distance between adjacent lenses on the optical axis OA described in the equations can refer to the embodiment disclosed above.

[0203] [Equation 1] 1 < CT1 / CT2 < 5

[0204] Equation 1 sets the difference in the center thickness of the first lens and the second lens, thereby improving the chromatic aberration of the optical system. Equation 1 can be satisfied: 1 < CT1 / CT2 < 3. By making the thickness of the first lenses 101 and 111 made of glass thicker than the center thickness of the adjacent lenses, the change in optical characteristics due to temperature change can be suppressed, and the optical performance at the center and periphery of the FOV can be improved.

[0205] [Equation 2]

[0206] (CT7 * CA7) < (CT1 * CA1)

[0207] Equation 2 can set the center thickness and effective diameter of the first lens and the seventh lens. The effective diameter is the average of the effective diameters of the object side surface and the sensor side surface of each lens. In Equation 2, the following conditions can be satisfied: CT7 < CT1 and CA7 < CA1. By setting the center thickness and effective diameter of the glass lens and the plastic lens, the optical system can improve spherical aberration and can provide a thin imaging device module.

[0208] [Equation 3] Po1 < 0

[0209] In Equation 3, Po1 means the refractive power of the first lens 101, 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 in the range of 1.5 times or more of the effective focal length F, for example, 1.5 times to 3 times.

[0210] [Equation 4] 1.70 < Nd5 < 2.2

[0211] Nd5 is the refractive index of the d-line of the fifth lenses 105 and 115. Equation 4 sets the refractive index of the fifth lens to be high so that it can control the factor that affects the reduction of the third-order aberration (Seidel aberration) of the optical system and can reduce the aberration that may occur when the TTL becomes slightly longer. Equation 4 can preferably satisfy: 1.75 ≤ Nd5 < 2.0. If it is designed to be lower than the lower limit of Equation 4, the aberration may be reduced to obtain performance, and the refractive power of the fifth lens may be weakened, so that light cannot be efficiently collected, which may deteriorate the performance of the optical system. If it is designed to be higher than the upper limit of Equation 4, there is a disadvantage that it becomes difficult to obtain materials. In addition, if the refractive index of the fifth lenses 105 and 115 is designed to be lower than the lower limit of Equation 4, the curvature radii of the sixth lens and the seventh lens must be increased to increase the refractive power of the sixth lens and the seventh lens. In this case, lens manufacturing becomes more difficult, the lens defect rate increases, and the yield rate decreases.

[0212] [Equation 4-1] 1.60 ≤ Aver(Nd1:Nd7) ≤ 1.70

[0213] In Equation 4-1, Aver(Nd1:Nd7) is the average value of the refractive index values of the d-line of the first lens to the seventh lens. When 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.

[0214] [Formula 4-2] 1.0 <SSL_Nd_Aver / ASL_Nd_Aver<1.5

[0215] SSL_Nd_Aver is the average value of the refractive index of the spherical lenses in the lens sections 100 and 100A, and ASL_Nd_Aver is the average value of the refractive index of the aspherical lenses. By positioning aspherical lenses with high refractive index on both sides of the glass lens, dispersion on both sides of the optical system can be controlled.

[0216] [Formula 4-3] 1.5≤Nd1<1.65

[0217] Nd1 is the refractive index of the d-line of the first lenses 101 and 111. Formula 4-3 sets the refractive index of the first lens to be high, thereby reducing dispersion and increasing the distance between the first lens and the second lens.

[0218] [Formula 5] 20 <FOV_H<40

[0219] In Formula 5, FOV_H means the horizontal field of view, and the range of the vehicle optical system can be set. Formula 5 preferably satisfies the range of 25≤FOV_H≤35 or 30 degrees ±3 degrees, and at this time, the sensor length in the horizontal direction can be based on 8.064mm±0.5mm. In addition, when Formula 5 is satisfied, when the temperature changes from room temperature to high temperature, the rate of change of the effective focal length and the rate of change of the field of view can be set to 5% or less, for example, 0 to 5%. In addition, even if one or more aspherical lenses, such as two or more aspherical lenses, are used in combination with a spherical lens in the optical system 1000, degradation of optical characteristics can be prevented by temperature compensation of the glass lens. Here, when the vertical field of view is FOV_V, the following conditions can be satisfied: 10 <FOV_V<FOV_H。

[0220] [Equation 6] L1R1<0

[0221] L1R1 is the radius of curvature of the first surface S1 of the first lens 101 on the optical axis, and may be set to be less than 0. When this formula 6 is satisfied, the shape of the optical system may be limited. The object side surface of the first lens 101 is formed concavely on the optical axis so that when it comes into contact with an external structure, surface damage can be prevented and incident light can be refracted in a direction away from the optical axis. Therefore, compared with the center thickness of the first lenses 101 and 111, the edge thickness can be increased, and the distance between the first lenses 101 and 111 and the second lenses 102 and 112 can be increased.

[0222] [Formula 6-1] L3R1>0, L2R1>0

[0223] L3R1 is the radius of curvature on the optical axis of the object-side surface of the third lens 103, and L2R1 is the radius of curvature on the optical axis of the object-side surface of the second lens. Since the second lens and the third lens have convex shapes on both sides of the optical axis, the distance between the first lens and the second lens can be increased, and the radius of curvature of the sensor-side surfaces of the second lenses 102 and 112 can be increased to reduce the center distance between the second lens and the third lens. Since the effective diameters of the second lens to the fourth lens are large and the average radius of curvature is set to a spherical lens, the assembly performance can be improved. This can reduce the influence on the optical characteristics of the light passing through the second lens to the fourth lens. Since the absolute value satisfies the following condition: L3R2 > L3R1, the light can be adjusted so that the effective diameters of the lenses arranged on the sensor side, i.e., the fourth lens to the seventh lens, are not greater than the effective diameter of the third lens, and the TTL can be reduced. If the absolute value satisfies the condition: L3R1 > L3R2, there is a problem of aberration occurring between the object-side surfaces of the first lens and the second lens, or the effective diameter of the sensor-side lens increases, or the TTL increases.

[0224] [Equation 7] 0.8 < BFL / L7S2_max_sag to Sensor < 3

[0225] BFL is the distance on 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. L7S2_max_sag to Sensor can be the distance from the maximum Sag value of the seventh lens 107 in the optical axis direction to the image sensor 300. When the optical system satisfies Equation 7, the TTL can be reduced, and the conditions for manufacturing the imaging device module can be set. In addition, L7S2_max_sag to Sensor can set the space where the filter 500 and the cover glass 400 located between the image sensor 300 and the seventh lenses 107 and 117 can be placed. When the range of Equation 7 is less than the lower limit, the space for placing circuit structures such as filters and image sensors becomes more restricted, and the process of assembling circuit structures such as filters and image sensors 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 filters and image sensors 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. BFL is the distance on 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: 2 < BFL / L7S2_max_sag to Sensor < 3, the manufacturing convenience and the reduction of TTL are easier.

[0226] [Equation 8] 1 < CT1 / CT7 < 6

[0227] When formula 8 is satisfied, the aberration characteristics can be improved, and the influence on the reduction of the optical system can be set. Formula 8 can preferably satisfy: 2≤CT1 / CT7<5. Formula 8 can set the center thickness of the first lens having an aspherical surface and the seventh lens having an aspherical surface, and limit the difference in their center thicknesses. Therefore, the chromatic aberration of the optical system can be improved, good optical performance can be achieved under a set field of view, and TTL can be controlled.

[0228] [Formula 8-1] 0.1 <CT1 / CA11<0.5

[0229] In Formula 2, the center thickness CT1 of the first lenses 101 and 111 and the effective diameter CA11 of the object side surface S1 of the first lens 101 can be set, and if this is satisfied, the strength and optical characteristics of the glass lens can be prevented from being deteriorated. If it is lower than the range of Formula 1, the lens may be damaged or difficult to handle, and if it is greater than the above range, the TTL may increase and the weight of the optical system may become heavy. Preferably, 0.15≤CT1 / CA11≤0.3 may be satisfied.

[0230] [Formula 9]1 <CG1 / CT1<5

[0231] CG1 is the center distance between the first lens and the second lens. In Formula 9, the center distance between the first lens and the second lens and the center thickness of the first lens having an aspherical surface can be set. When the optical system satisfies Formula 9, the influence of heat transferred from the outside to the first lens can be reduced by the second lens to the seventh lens. Formula 9 preferably satisfies: 1.5 <CG1 / CT1<4。

[0232] [Formula 10] <CG1 / CT45<3

[0233] In Formula 10, CT45 is the center thickness of the fourth lens and the fifth lens, for example, the center thickness of the cemented lenses 145 and 145A. That is, CT45 is the optical axis distance from the center of the object-side surface of the fourth lenses 104 and 114 to the center of the sensor-side surface of the fifth lenses 105 and 115. When the optical system satisfies Formula 10, the aberration characteristics can be improved by setting the center distance between the cemented lens and the first lens and the second lens, and preferably, 1.5≤CG1 / CT45<2 can be satisfied.

[0234] [Equation 11] 0<|L2R1 / L4R2|<1

[0235] In Formula 11, L2R1 means the curvature radius of the first surface S1 of the second lenses 102 and 112, and L4R2 means the curvature radius of the eighth surface S8 of the fourth lenses 104 and 114. When the optical system 1000 according to the embodiment satisfies Formula 11, the optical system 1000 can improve aberration characteristics.

[0236] [Equation 12] <CT45–ET45<2mm

[0237] In Formula 12, ET45 is an optical axis distance from the end of the effective area of ​​the object-side surface of the fourth lens 104 and 114 to the end of the effective area of ​​the sensor-side surface of the fifth lens 105 and 115. When the optical system satisfies Formula 12, the center thickness and edge thickness of the cemented lens may be set to improve aberration characteristics, and preferably, 1 mm ≤ CT45 / ET45 < 1.5 mm may be satisfied. ET45 may be greater than the edge thickness ET1 to ET7 of each of the second to seventh lenses.

[0238] [Equation 13] <CA11 / CA31<2

[0239] In Formula 13, CA11 means an effective diameter of the first surface S1 of the first lenses 101 and 111, and CA31 means an effective diameter of the fifth surface S5 of the third lenses 103 and 113. When Formula 13 is satisfied, the optical system 1000 can control incident light and set factors that affect aberrations, and preferably, 1 can be satisfied. <CA11 / CA31<1.5。

[0240] [Equation 14] <CA72 / CA42<2

[0241] In Formula 14, CA42 means the effective diameter of the eighth surface S8 of the fourth lens (104, 114), and CA72 means the effective diameter of the fourteenth surface S14 of the seventh lens (107, 117). When Formula 14 is satisfied, the optical system 1000 can control the incident light path and set the factor of performance variation according to CRA and temperature. Preferably, Formula 14 can satisfy: 0.5 <CA72 / CA42<1.0。

[0242] [Equation 15] <CA12 / CA21<2

[0243] In Formula 15, CA12 means an effective diameter of the second surface S2 of the first lenses 101 and 111, and CA21 means an effective diameter of the third surface S3 of the second lenses 102 and 112. When the optical system 1000 according to the embodiment satisfies Formula 15, the optical system 1000 can control light traveling to the first lens group LG1 and the second lens group LG2, and can set a factor affecting the reduction of lens sensitivity. Formula 15 may preferably satisfy: 1≤CA12 / CA21<1.5.

[0244] [Formula 16]1 <CA1 / CA6<2

[0245] CA1 means the effective diameter of the first lenses 101 and 111, and CA6 means the effective diameter of the sixth lens 106. When the optical system 1000 according to the embodiment satisfies Formula 16, the size of the spherical lens may be set. Formula 16 may preferably satisfy: 1 <CA31 / CA42<1.7。

[0246] [Formula 17]1 <CA41 / CA52<2

[0247] CA42 means the effective diameter of the seventh surface S7 of the fourth lenses 104 and 114, and CA52 means the effective diameter of the tenth surface S10 of the fifth lenses 105 and 115. When the optical system 1000 according to the embodiment satisfies Formula 17, the optical system 1000 can improve chromatic aberration and set the size between the object side surface and the sensor side surface of the cemented lenses 145 and 145A. Therefore, by setting the effective diameter size of the cemented lens arranged closer to the object side than the aspheric lens, light incident through the cemented lens can be effectively guided to the aspheric lens. Formula 17 may preferably satisfy: 1 <CA41 / CA42<1.6。

[0248] [Equation 18] <CA52 / CA61<2

[0249] CA61 means the eleventh surface S11 of the sixth lens 106 and 116. 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 145 and 145A 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 set the size and curvature radius between the sensor side surfaces of the cemented lenses. Therefore, the effective diameter size of the aspherical lens and the spherical lens arranged on the object side can be set compared to the last lens. Formula 18 preferably satisfies: 0.5 <CA52 / CA61<1。

[0250] [Formula 18-1] CA41>(ImgH*2)

[0251] [Equation 18-2] CA51 > (ImgH * 2)

[0252] [Equation 18-3] CA52 < (ImgH * 2)

[0253] [Equation 18-4] CA62 < (ImgH * 2)

[0254] In Equations 18-1 to 18-4, the optical paths to the area of the image sensor 300 can be set using the effective diameters of the object-side surfaces and the sensor-side surfaces of the fifth lenses 105 and 115, the effective diameters of the object-side surfaces of the fourth lenses 104 and 114, and the effective diameters of the sensor-side surfaces of the sixth lenses 106 and 116. In the embodiment, since the n-th lens is set as an aspherical lens, the ratio of the effective diameters of adjacent spherical lenses and cemented lenses can satisfy Equations 18 to 18-3.

[0255] [Equation 19] 0 < SSL_CA_Aver / ASL_CA_Aver < 1

[0256] In Equation 19, SSL_CA_Aver means the average effective diameter of the lenses having spherical surfaces, and ASL_CA_Aver means the average effective diameter of the lenses having aspherical surfaces. In Equation 19, the size of the effective diameter of the aspherical lens placed on the object side is set to be the largest, so that the path of the incident light can be effectively guided. In addition, the difference between the effective diameters of the spherical lens and the aspherical lens can be set not to be large. Preferably, 0.5 < SSL_CA_Aver / ASL_CA_Aver < 1 can be satisfied. Here, nGL > nASL > nPL > 0 can be satisfied. nGL is the number of glass lenses, nPL is the number of plastic lenses, and nASL is the number of aspherical lenses.

[0257] [Equation 20] 0 < SSL_Nd_Aver / ASL_Nd_Aver < 1.60

[0258] In Equation 19, SSL_Nd_Aver is the average value of the refractive indices of the spherical material lenses, such as the average value of the refractive indices of the second lens to the sixth lens. ASL_Nd_Aver is the average value of the refractive indices of the first 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: 1 ≤ SSL_nd_Aver / ASL_nd_Aver < 1.2.

[0259] [Equation 20-1] 0 < ΣASL_Nd / ΣSSL_Nd < 0.5

[0260] ΣASL_Nd is the sum of the refractive indices of the aspherical lenses, and ΣSSL_Nd is the sum of the refractive indices of the spherical lenses. Preferably, 0.2<ΣASL_Nd / ΣSSL_Nd<0.5 may be satisfied. The optical system may control resolution and dispersion by setting the difference in refractive index between the spherical lens and the aspherical lens.

[0261] [Formula 21] CA7<(ImgH*2) <CG1

[0262] In Formula 21, CA7 is the average effective diameter of the object side surface and the sensor side surface of the plastic lens, and CG1 is the center distance between the first lens and the second lens. Since the diagonal length of the image sensor satisfies Formula 21, a slim camera module can be provided.

[0263] [Formula 22] (CT2+CT3+CT4) <CG1

[0264] Formula 22 can set the center distance between the first lens and the second lens to be greater than the sum of the center thicknesses of the three adjacent lenses. If Formula 22 is satisfied, the center thicknesses from the second lens to the fourth lens can be set so that the optical performance of the peripheral part of the FOV can be improved.

[0265] [Formula 22-1] G4<0.01 or CG4<0.01

[0266] In Formula 22-1, G4 and CG4 are the distance and the center distance between the fourth lens 104 and the fifth lens 105. If Formula 22-1 is satisfied, the fourth lens and the fifth lens may be provided as a cemented lens.

[0267] [Equation 23] <CT7 / CG6<1.5

[0268] In Formula 23, CG6 is the center distance between the sensor-side surface of the sixth lens 106 and the object-side surface of the seventh lens 107. In Formula 23, the center thickness CT7 of the seventh lens 107 and the center distance between the sixth lens and the seventh lens are set to improve the optical performance of the peripheral part of the field of view. Formula 23 preferably satisfies: 0.5 <CT7 / CG6<1.5。

[0269] [Formula 24] CT3<(CT2*2) <CG1<F

[0270] The relationship between the maximum center distance CG1, the center thickness of the second lens and the third lens, and the total effective focal length F can be set. Through Equation 24, the incident light can be guided by the thickness of the object side glass lens and the maximum center distance, and thermal compensation can be performed according to temperature changes, and the assembly characteristics can be improved.

[0271] [Equation 25] (CT7 * 3) < CG1 < F

[0272] If the center thickness of the seventh lens satisfies Equation 25, the light emitted through the thickness of the sensor-side aspherical lens can be refracted to the entire area of the image sensor, and the TTL can be reduced.

[0273] [Equation 26] 2 < CT6 / CT7 < 6

[0274] 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 factor affecting the aberration can be controlled. Preferably, Equation 26 can be satisfied: 3 < CT6 / CT7 < 5.

[0275] [Equation 27] 10 < L7R1 / CT7 < 40

[0276] L7R1 means the radius of curvature of the thirteenth surface of the seventh lens on the optical axis. 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 peripheral parts of the field of view. Preferably, Equation 27 can be satisfied: 10 < L7R1 / CT7 < 30.

[0277] [Equation 28] 0 < L5R2 / L7R1 < 1

[0278] L5R2 means the radius of curvature of the tenth surface of the fifth lens on the optical axis. In Equation 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 powers of the fifth lens and the seventh lens can be controlled. Therefore, good optical performance can be achieved at the center and peripheral parts of the field of view. Preferably, Equation 28 can be satisfied: 0 < L5R2 / L7R1 < 0.5.

[0279] [Equation 29] L1R1 * L1R2 < 0.

[0280] L1R2 means the radius of curvature of the sensor-side surface of the first lens on the optical axis. If Equation 29 is satisfied, the refractive power of the first lens and the dispersion of the incident light can be adjusted, and the distance between the first lens and the second lens can be increased and the assemblability of the first lens can be improved.

[0281] [Equation 30] 0 < L5R1 / L4R2 < 2

[0282] L5R1 means the radius of curvature of the object-side surface of the fifth lens on the optical axis, and L4R2 means the radius of curvature of the sensor-side surface of the fourth lens on the optical axis. If Equation 30 is satisfied, the fourth lens and the fifth lens can be represented as a combined lens. Preferably, L5R1 / L4R2 = 1 can be satisfied.

[0283] [Equation 31] 0 < L6R2 / L6R1 < 3

[0284] L6R1 means the radius of curvature of the object side surface of the sixth lens on the optical axis, and L6R2 means the radius of curvature of the sensor side surface of the sixth lens on the optical axis. In Equation 31, the radii of curvature of the object side surface and the sensor side surface of the sixth lens can be set. Equation 31 can preferably satisfy: 1.5 < L6R2 / L6R1 < 3. The object side surface and the sensor side surface of the sixth lens, which is a glass lens, are spherical surfaces, and when the difference in the radii of curvature of the object side surface and the sensor side surface satisfies the above range, the assembly performance of the sixth lens can be improved, and the influence on the optical characteristics due to temperature change can be suppressed.

[0285] [Equation 31-1] 1 < L7R1 / L7R2 < 3

[0286] L7R1 and L7R2 mean the radii of curvature of the object side surface and the sensor side surface of the seventh lens on the optical axis. In Equation 31-1, by setting the radii of curvature of the aspherical object side surface and the aspherical sensor side surface of the plastic lens, light can be refracted by the seventh lens to the entire area of the image sensor. Therefore, if the difference in the radii of curvature of the object side surface and the sensor side surface of the seventh lens satisfies the above range, the assemblability of the seventh lens can be improved, and the influence on the optical characteristics due to temperature change can be suppressed.

[0287] [Equation 32] 0 < CG_Max / CT_Max < 3

[0288] In Equation 32, the maximum center thickness CT_Max among the lenses and the maximum center distance CG_Max between adjacent lenses can be set. When Equation 32 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 first embodiment can satisfy: 1 < CG_Max / CT_Max < 2.

[0289] [Equation 33] 1 < ΣCT / ΣCG < 5

[0290] ∑CT is the sum of the center thicknesses of the lenses, and ∑CG 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 the TTL can be reduced. Preferably, it can satisfy 1 < ΣCT / ΣCG < 2.

[0291] [Equation 34] 8 < ΣNd < 30

[0292] ∑Nd means the sum of the refractive index at the d-line of each lens in the plurality of lenses. If equation 34 is satisfied, the optical system 1000 in which the aspherical lens and the spherical lens are mixed can control TTL and have improved resolution. In addition, if the number of spherical lenses is greater than the number of aspherical lenses, thermal compensation can be performed by a spherical lens having a relatively thick thickness, and the sum of the refractive index of the lens and TTL can be set. Equation 34 can preferably satisfy: 10<∑Nd<13.

[0293] [Equation 35] 10<ΣVd / ΣNd<50

[0294] ΣVd means the sum of the Abbe numbers of each lens in 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 numbers of the lenses and the sum of the refractive indices to control optical characteristics, and preferably satisfies: 20<ΣVd / ΣNd<35.

[0295] [Formula 36]Distortion<2

[0296] Distortion means the maximum value or the absolute value of the maximum value of the distortion from 0.0F at the center of the image sensor to 1.0F at the end of the diagonal line 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.

[0297] [Equation 37] 0<ΣCT / ΣET<2

[0298] ΣCT is the sum of the center thickness of the lens, and ΣET is the sum of the edge thickness of the ends 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 preferably satisfies: 1<ΣCT / ΣET<1.5.

[0299] [Formula 38]1 <CA11 / CA_Min<5

[0300] 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 relationship between the maximum effective diameter of the glass lens and the minimum effective diameter of the plastic lens can be set, thereby providing a thinner module while maintaining incident light control and optical performance. Equation 38 preferably satisfies: 1 <CA11 / CA_Min<2.5。

[0301] [Formula 39]1 <CA_Max / CA_Min<5

[0302] CA_Max means 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: 1.2 <CA_Max / CA_Min<2.5。

[0303] [Formula 40]1 <CA_Max / CA_Aver<3

[0304] CA_Aver means 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 in a slim and compact structure while maintaining optical performance. Equation 40 may preferably satisfy: 1 <CA_Max / CA_Aver<1.7。

[0305] [Equation 41] 0.5 <CA_Min / CA_Aver<2

[0306] 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。

[0307] [Formula 42]1 <CA_Max / (2*ImgH)<3

[0308] 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 this is satisfied, 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。

[0309] [Formula 43]1 <TD / CA_Max<4

[0310] 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。

[0311] [Formula 43-1]TD>SD

[0312] SD is the distance from the position of the aperture to the center of the sensor side of the final lens.

[0313] [Formula 44]1 <F / CA61<10

[0314] F represents the effective focal length (EFL) of the optical system and can be 10 mm or greater, for example, in the range of 10 mm to 20 mm. In Equation 44, the relationship between the effective focal length and the effective diameter of the object side surface of the last spherical lens is set so that the influence on the optical system to reduce, for example, TTL can be controlled. Equation 44 can preferably satisfy: 1 < F / CA61 < 2.

[0315] [Equation 45] 0 < F / |L1R1| < 1

[0316] In Equation 45, the effective focal length of the optical system and the radius of curvature of the object side surface of the first lens on the optical axis can be set so that the influence on the incident light and TTL can be controlled. Equation 45 can preferably satisfy: 0 < F / |L1R1| < 0.5.

[0317] [Equation 46] Max(CT / ET) < 3

[0318] Max(CT / ET) means the maximum value of the ratio of the central 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. Equation 46 can preferably satisfy: 0.5 < Max(CT / ET) < 2.5. Therefore, the assembly of the entire lens can be improved.

[0319] [Equation 47] 0 < EPD / |L1R1| < 1

[0320] EPD means the size (mm) of the entrance pupil diameter of the optical system 1000, and L1R1 means the radius of curvature of the first surface S1 of the first lens on the optical axis. 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 < EPD / |L1R1| < 0.5.

[0321] [Equation 48] -10 < F1 / F3 < 0

[0322] F1 is the focal length of the first lens, and F3 is the focal length of the third lens. When Equation 48 is satisfied, the resolution can be improved by controlling the refractive power of the first lens and the third lens, and the TTL and the effective focal length (EFL) may be affected. Preferably, -5 < F1 / F3 < 0 can be satisfied.

[0323] [Equation 49] Po4 * Po5 < 0

[0324] Po4 is the refractive power value of the fourth lens, and Po5 is the refractive power value of the fifth lens. That is, the fourth lens and the fifth lens have opposite refractive powers so that the aberration can be improved, and the aspherical lens can effectively guide the light. When the value of Po4 * Po5 is greater than 0, the effect of improving the chromatic aberration due to the cemented lens is not significant.

[0325] [Equation 49-1] Po1(Po4 * Po5) > 0

[0326] [Equation 49-2] F45 < 0

[0327] [Equation 49-3] F4 * F5 < 0

[0328] Po1 is the refractive power value of the first lens, F45 is the combined focal length of the fourth lens and the fifth lens, F4 is the focal length of the fourth lens, and F5 is the focal length of the fifth lens. When Equations 49-1 to 49-3 are satisfied, it is easy to improve the aberration of an optical system having the fourth lens and the fifth lens as a cemented lens, and incident light can be effectively guided to the aspherical lens.

[0329] [Equation 50] 15 < Vd4 - Vd5 < 50

[0330] Vd4 is the Abbe number of the fourth lens, and Vd5 is the Abbe number of the fifth lens. If Equation 50 is satisfied, the difference in the Abbe numbers of 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 < Vd4 - Vd5 < 40. If 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.

[0331] [Equation 51] 0 < |F1 / F| < 20

[0332] Equation 51 sets the relationship between the focal length F1 of the first lens having an aspherical surface and the effective focal length F, and the TTL of the optical system can be set. Equation 51 can preferably be satisfied as: 1 < |F1 / F| < 5.

[0333] [Equation 52] 0 < |F5 / F6| < 1

[0334] In Equation 52, by setting the relationship between the focal lengths F5 and F6 of the fifth lens and the sixth lens, the refractive power and the optical path of the spherical lens and its adjacent spherical lens can be adjusted, and the resolution can be improved. Equation 52 is preferably satisfied as: 0 < |F5 / F6| < 0.5.

[0335] [Equation 53] 0 < |F5 / F7| < 1

[0336] In Equation 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. Equation 53 is preferably satisfied as: 0 < |F5 / F7| < 0.2.

[0337] [Equation 54] 0 < |F6 / F1| < 2

[0338] In Equation 54, by setting the relationship between the focal lengths F1 and F6 of the first lens and the sixth lens, the refractive powers and optical paths of the first aspherical lens and the last spherical lens can be controlled, and the influence of TTL can be controlled to improve the resolution. Equation 54 preferably satisfies: 0 < |F6 / F1| < 1.

[0339] [Equation 55] 0 < |F37| / F12 < 3

[0340] In Equation 55, by setting the relationship between the combined focal length F37 of the third lens to the seventh lens and the combined focal length F12 of the first lens and the second lens, the refractive powers of the object-side lens group and the sensor-side lens group based on the aperture stop can be controlled to improve the resolution, and the optical system can be provided in a thin and compact size. Equation 55 preferably satisfies: 0 < F37 / F12 < 1.5. Here, F12 is the focal length of the first lens group, F37 can be the focal length of the second lens group, and F37 can have a positive refractive power.

[0341] [Equation 56] 0 < F37 / F6 < 1

[0342] In Equation 56, by setting the relationship between the combined focal length F37 of the third lens to the seventh lens and the focal length F6 of the sixth lens, the combined refractive power of the third lens to the seventh lens and the refractive power of the last spherical lens can be adjusted to improve the resolution, and the optical system can be provided in a thin and compact size. Equation 56 can preferably satisfy: 0.5 < F37 / F6 < 1.

[0343] [Equation 57] 0 < |F37 / F7| < 1

[0344] In Equation 57, the relationship between the combined focal length F37 of the third lens to the seventh lens and the focal length F7 of the seventh lens is set so that the combined refractive power of the third lens to the seventh lens and the refractive power of the plastic lens can be adjusted to improve the resolution, and the optical system can be provided in a thin and compact size. Equation 57 preferably satisfies: 0 < |F37 / F7| < 0.7.

[0345] [Equation 58] 0 < F6 / F < 5

[0346] In Equation 58, the relationship between the focal length F6 of the sixth lens and the effective focal length F is set so that the refractive power of the last spherical lens and the overall focal length can be adjusted to improve the resolution, and the optical system can be provided in a thin and compact size. Equation 58 preferably satisfies: 1 < F6 / F < 3.5.

[0347] [Equation 59] F37 < TTL

[0348] In Equation 59, the relationship between the focal length F37 of the second lens group and the total length TTL can be set. The TTL can be reduced by the second lens group having an aspherical surface.

[0349] [Equation 60] 1 < nGL / nASL < 4

[0350] nGL is the number of glass lenses, and nASL means the number of aspherical lenses. In Equation 60, by arranging the aspherical lenses within the above range, the thickness of the optical system can be reduced, and more diverse refractive powers can be provided by the aspherical surfaces.

[0351] [Equation 61] 5 < nGL / nPL < 7

[0352] nPL is the number of plastic lenses in the lens unit. In Equation 61, by arranging the number of glass lenses and the number of plastic lenses in the above ratio, the thickness of the optical system can be reduced, and more diverse refractive powers can be provided by the aspherical surfaces.

[0353] [Equation 62] CA3 < CA2 < CA1

[0354] By setting the relationship between the effective diameter CA1 of the first lens, the effective diameter CA2 of the second lens, and the effective diameter CA3 of the third lens, the optical path of the front lens / rear lens of the diaphragm can be controlled, and the optical path of the entire lens can be set.

[0355] [Equation 63] 0 < ΣPL_CT / ΣGL_CT < 0.5

[0356] ΣPL_CT is the sum of the center thicknesses of the plastic lenses, and ΣGL_CT is the sum of the center thicknesses of the glass lenses. If Equation 62 is satisfied, the overall TTL can be controlled by setting the relationship between the thickness of the plastic lenses and the thickness of the glass lenses with respect to the TTL. Equation 62 can preferably be satisfied: 0 < ΣPL_CT / ΣGL_CT < 0.1.

[0357] [Equation 64] 10 mm < TTL < 50 mm

[0358] TTL means the distance (mm) on the optical axis OA from the center of the first surface S1 of the first lens 101 to the surface of the image sensor 300. In Equation 64, by making the TTL exceed 10 or exceed 20, a vehicle optical system can be provided. Equation 64 can preferably satisfy the following conditions: 30 < TTL < 45 or TD < TTL.

[0359] [Equation 65] 2 mm < ImgH

[0360] Equation 65 may set the diagonal size of the image sensor 300 (2*ImgH) and provide an optical system having a vehicle sensor size. Equation 65 may preferably satisfy: 4mm≤ImgH.

[0361] [Formula 66] 2mm <BFL<7mm

[0362] In Formula 66, BFL (back focal length) is set to be more than 2 mm and less than 7 mm, thereby ensuring the installation space of the filter 500 and the cover glass 400, improving the assemblability of the components by the distance between the image sensor 300 and the last lens, and improving the bonding reliability. Formula 66 may preferably satisfy: 2.5≤BFL≤3. If BFL is less than the range of Formula 66, some of the light transmitted to the image sensor may not be transmitted to the image sensor, which may result in a reduction in resolution. If the above BFL exceeds the range of Formula 68, stray light may be introduced, which may deteriorate the aberration characteristics of the optical system.

[0363] [Formula 67]3 <CG1 / BFL<5

[0364] In Formula 67, BFL is made smaller than the maximum interval between lenses, and the installation space of the filter 500 and the cover glass 400 can be ensured, and the assemblability of the components can be improved by the interval between the image sensor 300 and the last lens, and the bonding reliability can be improved. Preferably, in Formula 67, 3.2 can be satisfied <CG1 / BFL<4.5。

[0365] [Formula 68] CG6 <BFL

[0366] In Formula 68, BFL is set to be greater than the center distance CG6 between the spherical lens and the aspherical lens, thereby ensuring the installation space of the filter 500 and the cover glass 400, improving the assemblability of the components through the distance between the image sensor 300 and the last lens, and improving the bonding reliability. In addition, the seventh lens as the last lens can disperse the incident light to the effective area of ​​the image sensor, but if BFL does not satisfy Formula 68, some of the outgoing light may not be transmitted to the effective area of ​​the image sensor, thereby reducing the resolution.

[0367] [Formula 69]3 <F<40

[0368] Formula 69 can set the total effective focal length F suitable for the vehicle optical system. Formula 69 can satisfy: 10 <F<30。

[0369] [Equation 70] FOV<45

[0370] In Formula 70, FOV (Field of View) means the field of view (degrees) in the diagonal direction of the optical system 1000, and a vehicle optical system of less than 45 degrees may be provided. FOV may preferably satisfy: 20≤FOV≤40.

[0371] [Formula 71]1 <TTL / CA_Max<5

[0372] CA_Max means the maximum effective diameter (mm) among the object-side surface and the sensor-side surface of the plurality of lenses, and TTL means the distance (mm) from the vertex of the first surface S1 of the first lens to the image surface of the image sensor 300 on the optical axis OA. Equation 71 sets the relationship between the total optical axis length of the optical system and the maximum effective diameter, and may provide an improved vehicle optical system. Equation 71 may preferably satisfy: 1.5 <TTL / CA_Max<4。

[0373] [Formula 72]2 <TTL / ImgH<15

[0374] Equation 72 may set the total optical axis length (TTL) of the optical system and the diagonal length (ImgH) from the optical axis of the image sensor 300. When the optical system 1000 according to the embodiment satisfies Equation 72, the optical system 1000 may have a TTL applied to the vehicle image sensor 300, thereby providing improved image quality. Equation 72 may preferably satisfy: 4 <TTL / ImgH≤10。

[0375] [Equation 73] 0.1 <BFL / ImgH<2

[0376] Formula 73 may set the optical axis distance between the image sensor 300 and the last lens and the diagonal length from the optical axis of the image sensor 300. When the optical system 1000 according to the embodiment satisfies Formula 73, the optical system 1000 may ensure that the BFL is used for the size of the image sensor 300 of the application vehicle, may set the distance between the last lens and the image sensor 300, and may have good optical characteristics at the center and periphery of the FOV. Formula 73 may preferably satisfy: 0.3 <BFL / ImgH<1。

[0377] [Formula 74]5 <TTL / BFL<20

[0378] Formula 74 may set (unit: mm) 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 Formula 55, the optical system 1000 may ensure the BFL. Formula 74 may preferably satisfy: 10 <TTL / BFL<20。

[0379] [Formula 75]1 <TTL / F<3

[0380] Formula 75 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 75 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 form an image while maintaining an appropriate focal length even when the temperature changes from a low temperature to a high temperature. When it is lower than the lower limit of Formula 75, it is necessary to increase the refractive power of the lens, making it difficult to correct spherical aberration or distortion aberration, and when it exceeds the upper limit of Formula 75, the effective diameter or TTL of the lens becomes longer, which may cause magnification problems of the imaging lens system.

[0381] [Formula 76]1 <F / BFL<10

[0382] Formula 76 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. When the optical system 1000 according to the embodiment satisfies Formula 76, 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, and thus may have good optical characteristics in the peripheral portion of the FOV. Formula 76 may preferably satisfy: 3 <F / BFL<8。

[0383] [Formula 77]1 <F / ImgH<5

[0384] Equation 77 may set the total effective focal length F of the optical system 1000 and the diagonal length (ImgH) from 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 77 may preferably satisfy: 2 <F / ImgH<4.1。

[0385] [Formula 78]1 <F / EPD<5

[0386] Formula 78 can set the total effective focal length F and entrance pupil diameter of the optical system 1000. Therefore, the overall brightness of the optical system can be controlled. Formula 78 can preferably set 1 <F / EPD<3。

[0387] [Formula 79]0 <BFL / TD<0.3

[0388] Equation 79 can set the relationship between the optical axis distance (TD) of the lens of the optical system 1000 and the BFL. Therefore, the resolution of the optical system can be maintained and the overall size can be controlled. Equation 79 preferably satisfies: 0 < BFL / TD < 0.2. When the conditional value of BFL / TD is 0.2 or more, the BFL is designed to be large compared to TD, so the size of the entire optical system becomes large, making it difficult to miniaturize the optical system, and the distance between the seventh lens and the image sensor becomes long, which may increase unnecessary light quantity between the seventh lens and the image sensor, resulting in problems such as deterioration of aberration characteristics that reduce the resolution.

[0389] [Equation 80] 0 < EPD / ImgH / FOV < 0.2

[0390] Equation 80 can set the relationship between the EPD, half of the diagonal length of the image sensor (ImgH), and the diagonal field of view. Therefore, the overall size and brightness of the optical system can be controlled. Preferably, Equation 80 can satisfy: 0 < EPD / ImgH / FOV < 0.1.

[0391] [Equation 81] 5 < FOV / F# < 40

[0392] Equation 81 can set the relationship between the diagonal field of view of the optical system and the F-number. Preferably, Equation 81 can satisfy: 10 < FOV / F# < 30. Here, F# is set to 1.8 or less to provide a bright image.

[0393] [Equation 82] 1 < ΣGL_CT / F# < 20

[0394] Equation 82 can set the relationship between the sum of the central thicknesses of the glass lenses of the optical system ΣGL_CT and the F-number F#. Preferably, in Equation 82, 10 < ΣSSL_CT / F# < 20 can be satisfied.

[0395] [Equation 83] 0 < ΣPL_CT / F# < 2

[0396] Equation 83 can set the relationship between the sum of the central thicknesses of the plastic lenses of the optical system ΣPL_CT and the F-number F#. Preferably, Equation 83 can satisfy: 0.5 < ΣPL_CT / F# < 1.

[0397] [Equation 84] 1 < ΣGL_Nd / F# < 10

[0398] Equation 84 can set the relationship between the sum of the refractive indices of the glass lenses of the optical system ΣGL_nd and the F-number F#. Equation 84 can preferably satisfy: 3 < ΣGL_Nd / F# < 8.

[0399] [Equation 85] 1 < ΣPL_Nd / F# < 2

[0400] The relationship between the sum of the refractive indices ΣPL_Nd of the plastic lenses and the F number F# can be set in equation 84. Equation 84 can preferably satisfy: 1<ΣPL_Nd / F#<1.5.

[0401] [Equation 86]|Max_Sag62|<|Max_Sag52|

[0402] Max_Sag62 is the maximum distance 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 in the optical axis direction, and Max_Sag52 is the maximum distance 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 in the optical axis direction. If Formula 86 is satisfied, light can be guided to the last spherical lens by the curvature radius of the sensor side surface of the fifth lens, and the effective diameters of the fifth lens and the sixth lens can be adjusted.

[0403] [Equation 87]|Max_Sag72|<|Max_Sag62|

[0404] Max_Sag72 is the maximum distance from a straight line perpendicular to the optical axis on the sensor side surface of the seventh lens to the sensor side surface of the seventh lens in the optical axis direction. If equation 87 is satisfied, light can be guided from the spherical lens to the 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.

[0405] [Formula 87-1]|Max_Sag52|<|Max_Sag41|

[0406] Max_Sag41 is the maximum distance in the optical axis direction from a 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 a 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.

[0407] The optical system 1000 according to the first and second embodiments may satisfy at least one or two or more of equations 1 to 44. At least one or two or more of equations 1 to 44 may satisfy at least one or two or more of equations 45 to 87. In this case, the optical system 1000 may have improved optical characteristics. Specifically, when the optical system 1000 satisfies at least one of equations 1 to 44 and / or at least one of equations 45 to 87, the optical system 1000 may have improved resolution and improved aberration and distortion characteristics. In addition, the optical system 1000 may ensure that the BFL is used for applying the vehicle image sensor 300, compensate for the degradation of optical characteristics due to temperature changes, and minimize the distance between the last lens and the image sensor 300, thereby providing good optical performance at the center and periphery of the FOV.

[0408] Table 2 shows the terms of the above formula in the optical system 1000 in the first and second embodiments, including TTL (mm), BFL, effective focal length F (mm), ImgH (mm), effective diameter CA (mm), thickness (mm), TTL (mm), TD (mm), focal length F1 to F7 (mm) of each lens from the first lens to the seventh lens, the sum of the refractive index of each lens, the sum of the Abbe number of each lens, the sum of the center thickness of each lens (mm), the sum of the center distances between adjacent lenses, the effective diameter, the diagonal FOV (degrees), the edge thickness ET, the focal lengths of the first lens group and the second lens group, and the F number, etc. of the optical system 1000, and TD is the optical axis distance from the first surface S1 to the fourteenth surface S14.

[0409] [Table 2]

[0410]

[0411]

[0412]

[0413] Table 3 shows the result values ​​of the above-mentioned formulas 1 to 44 in the optical system 1000 of the embodiment. Referring to Table 3, 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 44. Specifically, it can be seen that the optical system 1000 according to the embodiment satisfies all of the formulas 1 to 44. Therefore, the optical system 1000 can have good optical performance and excellent optical characteristics at the center and periphery of the FOV.

[0414] [Table 3]

[0415]

[0416]

[0417]

[0418] Table 4 shows the result values ​​of the above-mentioned equations 45 to 87 in the optical system 1000 of the embodiment. Referring to Table 4, it can be seen that the optical system 1000 satisfies at least one, two or more, or three or more of equations 45 to 87. Specifically, it can be seen that the optical system 1000 according to the embodiment satisfies all of equations 1 to 87. Therefore, the optical system 1000 can have good optical performance and excellent optical characteristics at the center and periphery of the FOV.

[0419] [Table 4]

[0420]

[0421]

[0422] Will refer to Figures 21 to 35 An optical system according to a third embodiment of the present invention is described. The description of the third embodiment may include the description of the first and second embodiments in the same parts as the description and configuration of the first and second embodiments.

[0423] Reference Figure 21 to Figure 26 , the optical system 1000 includes a lens section 100B, and the lens section 100B may include first to seventh lenses 121 to 127. The first lens group LG1 includes the first lens 121, and the second lens group LG2 includes second to seventh lenses 122 to 127. An aperture stop may be provided on one of the periphery of the object side surface or the sensor side surface of the first lens 121 and the periphery of the object side surface or the sensor side surface of the second lens 122.

[0424] The first lens 121 may have a positive (+) refractive power and may be formed of a glass material. The first surface S1 of the first lens 121 may be convex, and the second surface S2 may be concave. The first lens 121 may be set as an aspherical lens made of glass. The first surface S1 and the second surface S2 may be set to have no critical point. The effective radius r11 of the first surface S1 of the first lens 121 may be greater than the effective radius of the plastic lens. Since the first lens 121 has a maximum effective diameter, and the first surface S1 is convex and the second surface S2 is concave, light incident through the maximum effective area may be refracted in the direction of the optical axis OA. In addition, since the first lens 121 has a meniscus shape convex toward the object side and has a center thickness thinner than the center thickness of the cemented lens 134 and the second lens 122 and the fifth lens 125, the optical axis distance CG1 between the first lens 121 and the second lens 122 may be increased. The optical axis distance CG1 between the first lens 121 and the second lens 122 may be greater than the center thickness of the second lens 122 and less than the effective diameter of the second lens 122.

[0425] The second lens 122 may have a negative (-) refractive power and may be provided by a glass material. The third surface S3 of the second lens 122 may be concave, and the fourth surface S4 may be convex. The second lens 122 may be provided by a spherical lens made of glass. The third surface S3 and the fourth surface S4 of the second lens 122 may be spherical.

[0426] The third lens 123 may have a negative (-) refractive power and may be provided by a glass material. The fifth surface S5 of the third lens 123 may be convex, and the sixth surface S6 may be concave. The third lens 123 may be configured as a spherical lens made of glass. The fifth surface S5 and the sixth surface S6 of the third lens 123 may be spherical. The aperture stop ST may be disposed around the fourth surface S4 on the sensor side of the second lens 122. The composite focal length of the third lens 123 to the seventh lens 127 disposed on the sensor side of the aperture may have a positive value, and the TTL within the field of view may be reduced.

[0427] The fourth lens 124 may have a positive (+) refractive power and may be provided in a glass material. The object-side seventh surface of the fourth lens 124 may be convex, and the sensor-side eighth surface S8 may be convex. The fourth lens 124 may have a convex shape on both sides. Differently, the seventh surface may have a concave shape on the optical axis OA, and the eighth surface S8 may have a concave shape or a convex shape. The fourth lens 124 may have a meniscus shape convex toward the object. The fourth lens 124 may be set as a spherical lens made of glass. Both the seventh surface and the eighth surface S8 may be spherical.

[0428] The third lens 123 and the fourth lens 124 may be joined. The joint surface between the third lens 123 and the fourth lens 124 may be defined as the sixth surface S6. The fifth surface S5 may be the same surface as the seventh surface of the fourth lens 124. The distance G3 between the third lens 123 and the fourth lens 124 may be less than 0.01 mm. The distance G3 between the third lens 123 and the fourth lens 124 may be less than 0.01 mm from the optical axis OA to the end of the effective area. The third lens 123 and the fourth lens 124 have opposite refractive powers, and the combined refractive power of the third lens 123 and the fourth lens 124 may have a positive refractive power.

[0429] The effective diameter of the third lens 123 may be larger than the diagonal length of the image sensor 300. The effective diameter of the third lens 123 is the average of the effective diameters of the seventh surface S7 and the eighth surface S8, and may be larger than the diagonal length of the image sensor 300. The effective diameter of the fourth lens 124 may be larger than the effective diameter of the third lens 123 and smaller than the effective diameter of the fifth lens 125. In the case where the third lens 123 and the fourth lens 124 are glass lenses and the sixth lens 126 and the seventh lens 127 are plastic lenses, the fourth lens 124 and the fifth lens 125 may be arranged in a convex shape on both sides to refract light without moving away from the optical axis through which the light passes.

[0430] The cemented lens 134 is joined with glass lenses having different refractive indices and has spherical refracting surfaces. If the lens arranged on the sensor side instead of the cemented lens 134 is an aspherical lens or a plastic lens, spherical aberration can be compensated. In addition, since the lens arranged on the sensor side instead of the cemented lens 134 is a plastic lens and is arranged as a lens having a small effective diameter, the light traveling through the plastic lens to the image sensor 300 can be effectively guided. Since the position of the cemented lens 134 is in the middle or in front of the middle within the lens unit 100B, chromatic aberration correction can be more effective.

[0431] The fifth lens 125 may have a positive (+) refractive power and may be provided by a glass material. The ninth surface S9 of the fifth lens 125 may be convex, and the tenth surface S10 may be convex. The fifth lens 125 may be provided by a spherical lens made of glass. The ninth surface S9 and the tenth surface S10 may be spherical. The sixth lens 126 may have a negative (-) refractive power and may be provided by a plastic material. The eleventh surface S11 of the sixth lens 126 may be convex, and the sensor-side twelfth surface S12 may have a concave shape. The sixth lens 126 may have a meniscus shape convex toward the object side. The sixth lens 126 may be made of a plastic material and may have aspherical surfaces on both sides. The eleventh surface S11 and the twelfth surface S12 of the sixth lens 126 may be aspherical. The eleventh surface S11 may be arranged to have no critical point from the optical axis OA to the end of the effective area. The twelfth surface S12 may have at least one critical point from the optical axis OA to the end of the effective area. When the twelfth surface S12 has a critical point, the critical point may be located at 70% or more of the effective radius r62 from the optical axis OA, or in the range of 70% to 90%, or in the range of 75% to 85%. The thirteenth surface S13 may be configured not to have a critical point.

[0432] The seventh lens 127 may have a negative (-) refractive power and may be made of a plastic material. The thirteenth surface S13 of the seventh lens 127 may be convex, and the fourteenth surface S14 may be concave. The seventh lens 127 may be made of a plastic material and may have aspheric surfaces on both sides. The thirteenth surface S13 and the fourteenth surface S14 may be aspheric. At least one or both of the thirteenth surface S13 and the fourteenth surface S14 may be arranged to have no critical point from the optical axis OA to the end of the effective region r72. When the fourteenth surface S14 has a critical point, the critical point may be located at 60% or less of the effective radius r72 from the optical axis OA, or in the range of 10% to 60%, or in the range of 10% to 50%.

[0433] By arranging at least two plastic lenses adjacent to the image sensor 300, the plastic lenses may be insensitive to assembly tolerances compared to glass lenses. That is, being insensitive to assembly tolerances means that even if there is a slight difference from the design during assembly, the optical performance may not be significantly affected. In addition, by providing at least two lenses 126 and 127 adjacent to the image sensor 300 from a plastic material, the optical performance can be improved by having a lens surface with an aspherical surface, and, for example, aberration characteristics can be improved and a reduction in resolution can be prevented.

[0434] In addition, the sixth lens 126 and the seventh lens 127 have an aspherical surface, a convex shape toward the object side, and have negative refractive power, so that the distribution of light irradiated to the entire area of ​​the image sensor 300 can be guided.

[0435] Reference Fig. 22 , a tangent line K3 passing through any point of the fourteenth surface S14 of the seventh lens 127 and a normal line K4 perpendicular to the tangent line K3 may have a predetermined angle θ2 with an axis parallel to the optical axis OA. A maximum tangent angle θ2 of the fourteenth surface S14 in the first direction X may be 45 degrees or less, for example, in the range of 5 to 43 degrees or in the range of 13 to 40 degrees.

[0436] Fig.23 yes Fig.21 Examples of lens data for an optical system according to an embodiment of the present invention. Fig.23 , when expressed as an absolute value of the radius of curvature, the radius of curvature of the tenth surface S10 of the fifth lens 125 on the optical axis OA may be the largest among the lenses, and the radius of curvature of the twelfth surface S12 of the sixth lens 126 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, in the range of 5 times to 15 times. The radius of curvature of the plastic material sixth lens 126 and the seventh lens 127 may be smaller than the radius of curvature of the glass material first to fifth lenses 121, 122, 123, 124 and 125. Here, the radius of curvature is an average value of the radius of curvature (absolute value) of the object side surface and the sensor side surface of each lens.

[0437] In terms of the center thickness CT of the lens, the center thickness CT2 of the second lens 122 may be greater than the center thickness of the plastic lens, and may be the largest, for example, within the lens portion 100B. For example, the center thicknesses CT2, CT4, and CT5 of the second lens 122, the fourth lens 124, and the fifth lens 125 may be greater than the center thicknesses CT6 and CT7 of the sixth and seventh lenses. The center thickness of each of the first lens 121 and the third lens 123 may be less than the center thickness of each of the sixth lens 126 and the seventh lens 127. The center thickness CT3 of the third lens 123 is the smallest among the lenses. The difference between the maximum center thickness and the minimum center thickness may be 2 mm or more. Even if the plastic lenses 126 and 127 provide a thin center thickness, the optical performance will not be reduced, and the thickness of the camera module may be thin. Here, the average value of the center thicknesses of the first lens 121 to the seventh lens 127 may be greater than the center thickness of each of the plastic lenses (e.g., the sixth lens 126 and the seventh lens 127). An average value of effective diameters of the first to seventh lenses 121 to 127 may be greater than an effective diameter of each of the plastic lenses (eg, the sixth and seventh lenses 126 and 127 ).

[0438] When describing the center distance between lenses, the first center distance CG1 between the first lens 121 and the second lens 122 is the largest. The first center distance CG1 is greater than the center thickness CT1 of the first lens 121 and the center thickness CT2 of the second lens 122, respectively, and may be no greater than twice the center thickness CT2 of the second lens 122. At least one of the second center distance CG2, the fourth center distance CG4, and the fifth center distance CG5 is the minimum interval and may be no greater than 0.3 mm. Here, the minimum center distance does not include the bonding surface of the cemented lens 134. The difference between the maximum center distance and the minimum center distance may be 3.5 mm or more, for example, in the range of 3.5 mm to 5 mm. In addition, by setting the maximum center distance between the lenses to 100% or more of the maximum center thickness, for example, in the range of 100% to 200%, the center thickness of the first lens 121 can be set to a convex meniscus shape on the thin object side.

[0439] Regarding the effective diameter, the lens having the largest effective diameter may be the first lens 121 closest to the object. The lens having the smallest effective diameter may be the seventh lens 127. The effective diameter of a lens made of a glass material may be larger than the effective diameter of a lens made of a plastic material. For example, the effective diameters of the first to fifth lenses 121 to 125 may be larger than the effective diameters of the sixth and seventh lenses 126 and 127. The effective diameters of the first to fifth lenses 121 to 125 may be larger than the diagonal length of the image sensor 300. The sixth lens 126 may have an effective diameter larger than the diagonal length of the image sensor 300, and the seventh lens 127 may have an effective diameter smaller than the diagonal length of the image sensor 300. Therefore, the plastic lens may guide the light refracted through the glass lens to the image sensor 300.

[0440] In terms of refractive index, the refractive index of the first lens 121 is the largest among the lenses and may be 1.75 or greater or 1.8 or greater. The refractive index of the fourth lens 124 is the smallest among the lenses. The difference between the maximum refractive index and the minimum refractive index may be 0.23 or greater. The refractive index of the lens closest to the object is the largest, and by setting the refractive index of the fourth lens 124 of the cemented lens 134 to the minimum, the incident efficiency can be improved, and the refractive power between the glass lens and the plastic lens can be adjusted to guide light to the image sensor 300.

[0441] In terms of Abbe number, the Abbe number of the fourth lens 124 is the largest among the lenses and may be 65 or more. The Abbe number of the sixth lens 126 is the smallest among the lenses. The difference between the maximum refractive index and the minimum Abbe number may be 45 or more. By making the Abbe number of the fourth lens 124 arranged on the sensor side larger than the aperture stop and setting the Abbe number of the sixth lens 126 arranged between the image sensor 300 and the glass lens to the minimum, the dispersion of light traveling between the glass lenses can be controlled, and the dispersion between the glass lens and the plastic lens can be increased to guide it to the image sensor 300.

[0442] The focal lengths F2, F3, F6, and F7 of the second lens 122, the fourth lens 123, the sixth lens 126, and the seventh lens 127 may have negative refractive power, and the focal lengths F1, F4, and F5 of the first lens 121, the fourth lens 124, and the fifth lens 125 may have positive refractive power. The fifth lens 125 may have positive refractive power, and the sixth lens 126 and the seventh lens 127 made of plastic may have negative refractive power. The refractive index of the fifth lens 125 may be smaller than the refractive index of the sixth lens 126, and the dispersion value of the fifth lens 125 may be greater than the dispersion value of the sixth lens 125. Chromatic aberration occurring in the fifth lens 125 may be corrected by a plastic lens. In addition, since the focal length of the seventh lens 127 is -300 or less, that is, the refractive power is relatively low and the Abbe number is set to be large, the color correction effect may also be low. In addition, since the refractive index difference between the fifth lens 125 and the sixth lens 126 arranged in series is 0.1 or greater and 0.15 or less, and the Abbe number difference is 20 or greater and 60 or less, chromatic aberration occurring in the glass material arranged on the object side of the plastic lens can be compensated by the plastic lens having negative refractive power.

[0443] The optical system 1000 causes chromatic aberration, and the chromatic aberration is corrected by using a cemented lens 134 or two lenses arranged in series. As the temperature changes from a low temperature to a high temperature, the lens repeatedly contracts and expands. Since the lens characteristics of lenses of the same material change by the same amount according to temperature changes, the plastic lens of the same material can effectively correct the chromatic aberration of the fifth lens even if the temperature changes. Therefore, in the third embodiment of the present invention, the chromatic aberration occurring in the glass material lens can be mutually compensated by the third lens 123 and the fourth lens 124, and the chromatic aberration occurring in the fifth lens 125 can be compensated by using the sixth lens 126 and the seventh lens 127 made of plastic.

[0444] The refractive index difference between the third lens 123 and the fourth lens 124 as a cemented lens is 0.1 or more and 0.2 or less, and the Abbe number difference is 20 or more and 60 or less, and the chromatic aberration occurring in the fifth lens made of glass can be compensated by the plastic lens. The refractive index difference is rounded to three decimal places, and the Abbe number difference is rounded to one decimal place, and the values ​​are compared. In addition, by arranging a glass lens having a relatively high Abbe number on the object side of the plastic lens, dispersion can be reduced by the glass lens, and dispersion can be increased by the plastic lens.

[0445] The focal lengths F1, F4, and F5 of the first lens 121, the fourth lens 124, and the fifth lens 125 have positive refractive power, and the focal lengths F2, F3, F6, and F7 of the second lens 122, the third lens 123, the sixth lens 126, and the seventh lens 127 may have positive refractive power. Here, the fourth lens 124 and the fifth lens 125 adjacent to the plastic lens have positive refractive power, and the sixth lens 126 and the seventh lens 127 have negative refractive power, and aberrations occurring in the glass material and the plastic lens may be corrected. In addition, since the amount of change between lenses of the same material is the same as the temperature change from low temperature to high temperature, aberrations may be corrected by increasing the focal length difference between lenses of the same material even in the case of temperature change. In addition, by arranging a glass lens having a relatively high Abbe number on the object side of the plastic lens, dispersion may be reduced by the glass lens, and dispersion may be increased by the plastic lens.

[0446] When the focal length is expressed as an absolute value, the focal length of the second lens 122 is the largest among the glass lenses and can be 100 or more. The focal length of the seventh lens 127 can be the largest within the lens portion 100B and can be 200 or more. The focal length of the fourth lens 124 is the smallest among the lenses. The difference between the maximum focal length and the minimum focal length can be 100 or more. By providing large focal lengths of the two lenses adjacent to the object and providing the maximum focal length of the plastic lens 127 adjacent to the image sensor 300, the optical system can have improved MTF characteristics, aberration control characteristics, resolution characteristics, etc. within a set field of view, and can have good optical performance in the peripheral portion of the field of view.

[0447] When expressed as an absolute value, the focal length of the glass lens may be smaller than the focal length of the plastic lens. For example, the composite focal length F15 of the first to fifth lenses 121 to 125 may be smaller than the composite focal length F67 of the sixth and seventh lenses 126 and 127. The composite focal lengths of the first to fifth lenses 121 to 125 are positive (+) values, and the composite focal lengths of the sixth and seventh lenses 126 and 127 are negative values.

[0448] Regarding the center thickness CT of the lens, for example, at least two or more of the glass lenses may have a center thickness greater than that of the plastic lens. If the average value of the center thickness of the glass lenses in the lens unit 100B is GLCT_Aver, and the average value of the center thickness of the plastic lens is PLCT_Aver, the following condition may be satisfied: GLCT_Aver > PLCT_Aver. Additionally, the following condition may be satisfied: 1 < GLCT_Aver / PLCT_Aver < 2.

[0449] In the lens unit 100B, the lens closest to the object may have the maximum refractive index, and it may be greater than 1.7, for example, 1.8 or greater. The refractive index of the lens closest to the object may be greater than that of the plastic lens. The number of glass lenses in the lens unit 100B having a refractive index lower than the average refractive index of the plastic material lens may be two or less, for example, one. Here, the plastic material lens has an aspherical surface on both the object side surface and the sensor side surface, and may have a refractive index less than 1.7.

[0450] In the lens unit 100B, when the average refractive index of the glass material lens is Aver_GLn and the average refractive index of the plastic lens is Aver_PLn, the following condition may be satisfied: Aver_PLn < Aver_GLn. Additionally, the following condition may be satisfied: 1 < Aver_GLn / Aver_PLn < 1.2. The lens with a high refractive index may be positioned on the object side of the plastic lens to increase chromatic aberration.

[0451] The average Abbe number of the glass material lens may be greater than that of the plastic lens. The average Abbe number of the glass lens may be 50 or greater, and the average Abbe number of the plastic lens may be 45 or less. The number of glass lenses in the lens unit 100B having an Abbe number lower than the average Abbe number of the plastic material lens may be two or less, for example, one. Here, the maximum Abbe number in the lens unit 100B may be handled by the glass material lens, and the minimum Abbe number may be handled by the plastic lens. The average Abbe number of the cemented lens 134 may be the largest among the lenses, for example, 70 or greater. One of the lenses in the cemented lens 134 may have the largest Abbe number. For example, the object side lens of the cemented lens 134 may have a larger Abbe number than the sensor side lens. When the average Abbe number of the glass lens is GLv_Aver and the average Abbe number of the plastic lens is PLv_Aver, the following condition may be satisfied: PLv_Aver < GLv_Aver. Additionally, the following condition may be satisfied: 1 < GLv_Aver / Plv_Aver < 1.8. The lens with a lower Abbe number may improve chromatic aberration at a position adjacent to the image sensor 300.

[0452] In the lens unit 100B, the number of lenses having an effective diameter larger than the average effective diameter of the plastic lenses may be three or more, for example, four or more. When the average effective diameter of the lenses made of plastic material is CA_PL_Aver and the average effective diameter of the lenses made of glass material is CA_GL_Aver, the following condition may be satisfied: CA_PL_Aver < CA_GL_Aver. Additionally, the following condition may be satisfied: 1 < CA_GL_Aver / CA_PL_Aver < 1.5. Further, the relationship between the length of the image sensor 300 and the average effective diameter CA_PL_Aver of the plastic lenses may satisfy the following condition: 1 ≤ (ImgH * 2) / CA_PL_Aver < 1.5. Further, the relationship between the average effective diameter of the glass material and the length of the image sensor 300 may satisfy the following condition: 1 ≤ CA_GL_Aver / (ImgH * 2) < 1.5. The difference between the maximum length of the image sensor 300 and the effective diameter of the lenses made of plastic material may not be set to be large. Thus, by arranging plastic lenses with small effective diameters adjacent to the image sensors 300, the plastic lenses can disperse the color from the center to the periphery of the image sensor 300.

[0453] The average effective diameter of the glass material may be 10.5 mm or more, for example, in the range of 10.5 mm to 15 mm, and may be larger than the average effective diameter of the plastic lenses. The minimum effective diameter within the lens unit 100B may be in the range of 8 mm to 10 mm, and the maximum effective diameter may be the effective diameter of the lens closest to the object and may be in the range of 12 mm to 20 mm. Thus, the optical system 1000 can improve the resolution and chromatic aberration control characteristics by controlling the incident light, and can improve the vignetting characteristics of the optical system 1000.

[0454] When the radius of curvature is described as an absolute value, the lens surface having the minimum radius of curvature based on the optical axis OA within the lens unit 100B may be provided on the lens surface of the n - 1 or n - 2 lens. For example, the lens surface having the minimum radius of curvature may be the sensor side surface of the plastic lens closest to the glass lens. The lens surface having the maximum radius of curvature may be the lens surface of the glass lens. For example, the n - 1 sensor side surface may have the minimum radius of curvature within the lens unit 100B. When the lens surface having the minimum radius of curvature is the sensor side surface of the plastic lens closest to the glass lens, the light may be refracted into the effective area of the last plastic lens having a relatively small effective diameter. Here, the minimum radius of curvature may be 20 or less, for example, 10 or less. The maximum radius of curvature may be three times or more the minimum radius of curvature.

[0455] When expressed in absolute value, when the average value of the curvature radius of the glass material lens is Aver_GLr and the average value of the curvature radius of the plastic material lens is Aver_PLr, the following conditions can be satisfied: Aver_GLr > R_PL_Aver. Additionally, the following conditions can be satisfied: 3 < Aver_PLr / Aver_GLr < 10. The average values of the curvature radii (absolute values) of the glass material lens and the plastic lens can satisfy the following conditions: 15 < Aver_GLr < 50 and 5 < Aver_PLr < 15. Therefore, by arranging plastic lenses with a small average curvature radius adjacent to the image sensor 300, the light distribution traveling to the image sensor 300 can be controlled.

[0456] As Fig.24 shown, among the lenses of the lens unit 100B in the embodiment, the lens surfaces S1, S2, S11, S12, S13, and S14 of the first lens 121, the sixth lens 126, and the seventh lens 127 may include aspherical surfaces having a 30th aspherical coefficient. As Fig.25 shown, the thicknesses T1 to T7 of the first lens 121 to the seventh lens 127 and the distances G1 to G6 between two adjacent lenses can be set. As Figure 5 shown, the thicknesses T1 to T7 of each lens in the Y-axis direction can be represented at intervals of 0.1 mm or 0.2 mm or more from the optical axis, and the distances G1 to G6 between each lens can be represented at intervals of 0.1 mm or 0.2 mm or more from the optical axis. The thickness T1 of the first lens 121 can be 1.5 times or less the difference between the maximum thickness and the minimum thickness, for example, in the range of 1 times to 1.5 times, and the center thickness can be the maximum and the edge thickness can be the minimum. The thickness T2 of the second lens 122 can be 1.5 times or less the minimum thickness, for example, in the range of 1.1 times to 1.5 times. The center of the second lens 122 can be the minimum thickness, and the edge can be the maximum thickness. The center thickness CT2 and the edge thickness ET2 of the second lens 122 can be greater than the center thickness CT5 of the fifth lens 125.

[0457] The thickness T3 of the third lens 123 can be the minimum at the center and the maximum at the edge. The center thickness CT3 of the third lens 123 can be the thinnest among the centers of the lenses. The edge thickness ET3 of the third lens 123 can be 1.8 times or less the center thickness CT3, for example, in the range of 1.2 times to 1.8 times. The center of the fourth lens 124 has the maximum thickness, and the edge has the minimum thickness, and the maximum thickness is 3 times or less the minimum thickness, for example, in the range of 1.5 times to 3 times. Here, the center thickness CT34 of the cemented lens 134 can be greater than the edge thickness ET34.

[0458] The center thickness CT5 of the fifth lens 125 may be the largest and greater than the edge thickness ET5. The center thickness CT5 of the fifth lens 125 may be greater than the center thickness CT1 of the first lens 121. The difference between the maximum thickness and the minimum thickness of the fifth lens 125 may be 3 times or less, for example, in the range of 1.5 times to 3 times. The center thickness CT6 of the sixth lens 126 is the smallest, the edge thickness ET6 is the smallest, and the maximum thickness is less than or equal to twice the minimum thickness, for example, in the range of 1 times to 2 times. The center thickness CT7 of the seventh lens 127 is the smallest, the edge thickness ET7 is the largest, and the maximum thickness is less than or equal to twice the minimum thickness, for example, in the range of 1 times to 2 times. As described above, the difference between the center thickness and the edge thickness of each lens of the first lens 121 to the seventh lens 127 may be set to be less than or equal to 3 times or less than or equal to 2.5 times, thereby reducing optical loss or design difficulties caused by the thickness difference from the optical axis to the edge.

[0459] Among the distances G1 to G6 between the above lenses, the first distance G1 between the first lens 121 and the second lens 122 may be the largest at the center and the smallest at the edge, and the difference between the center distance CG1 and the edge distance EG1 may be 2 times or less. Among the distances G1 to G6, the distance having the largest difference between the center distance and the edge distance may be the fifth distance G5.

[0460] like Fig. 22 and Fig.26As shown, Sag61 means the height from the center of the eleventh surface S11 of the sixth lens 126 to the lens surface in the direction X or Y orthogonal to the optical axis OA, and the maximum value of Sag61 can be the height at the edge of the eleventh surface S11. Sag62 means the height from the center of the twelfth surface S12 of the sixth lens 126 to the lens surface in the direction X or Y orthogonal to the optical axis OA, and the maximum value of Sag62 can be the height at the edge of the twelfth surface S12. Sag71 means the height from the center of the thirteenth surface S13 of the seventh lens 127 to the lens surface in the direction X or Y orthogonal to the optical axis OA, and the maximum value of Sag71 can be the height at the edge of the thirteenth surface S13. Sag72 is the height from the center of the fourteenth surface S14 of the seventh lens 127 to the lens surface in the direction X or Y orthogonal to the optical axis OA, and the maximum Sag value is the height at the edge. The maximum Sag value can satisfy the following. The following conditions can be satisfied: Max_Sag62 < Max_Sag61, and the difference between Max_Sag62 and Max_Sag61 can be 0.5 or less. The following conditions can be satisfied: Max_Sag71 < Max_Sag72 < Max_Sag62, and the difference between Max_Sag71 and Max_Sag72 can be 0.5 or less. By setting the Sag values of the object side surface and the sensor side surface of these plastic lenses, the light between the plastic lenses can be effectively refracted.

[0461] As Fig.26 and Fig.35 shown, when the Sag values of the object side surface and the sensor side surface of the sixth lens and the seventh lens are positive, the lens surface is located on the sensor side based on the straight line orthogonal to the optical axis OA, and when the Sag value is negative, the lens surface is located on the object side based on the straight line orthogonal to the optical axis OA. The Sag value of the lens surface of the seventh lens 127 can extend to almost the same curve graph. In addition, since the difference between the Sag values or the curve graphs of the object side surface and the sensor side surface of the sixth lens 126 and the seventh lens 127 is not large, the light reaching the image sensor 300 can be effectively guided. In Fig.35 it, L6S1 is the eleventh surface of the sixth lens 126, L6S2 is the twelfth surface of the sixth lens 126, L7S1 is the thirteenth surface of the seventh lens 127, and L7S2 is the fourteenth surface of the seventh lens 127.

[0462] As Fig.23 and Fig.35As shown, the radius of curvature of the eleventh surface S11 of the sixth lens 126 is L6R1, the radius of curvature of the twelfth surface S12 is L6R2, the radius of curvature of the thirteenth surface S13 of the seventh lens 127 is L7R1, and the radius of curvature of the fourteenth surface S14 is L7R1, and at least one or two of the following conditions can be satisfied.

[0463] Condition 1: 5 < L6R1 < 15, Condition 2: 5 < L7R1 < 15, Condition 3: 1 < |L6R1 - L7R1| < 5, Condition 4: 3 < L6R2 < 14, Condition 5: 3 < L7R2 < 14.5, Condition 6: 1 < |L7R2 - L6R2| < 5

[0464] By setting the maximum value of the difference (mm) in the radius of curvature between the eleventh surface S11 and the fourteenth surface S14 of the sixth lens 126 and the seventh lens 127 to 5 mm or less, the light passing through the plastic lens can be guided to the effective area of the image sensor 300. The eleventh surface S11 to the fourteenth surface S14 of the sixth lens 126 and the seventh lens 127 can be 15 mm or less. The radius of curvature (mm) of each of the eleventh surface S11 to the fourteenth surface S14 of the sixth lens 126 and the seventh lens 127 can be smaller than the radius of curvature of the first surface S1 and the second surface S2 of the first lens 121. In addition, the difference in the radius of curvature between the first surface S1 and the second surface S2 of the first lens 121 can be 10 mm or less, for example, 7 mm or less. Therefore, the difference in the radius of curvature between the object side surface and the sensor side surface of each of the first lens 121, the sixth lens 126, and the seventh lens 127 having an aspherical surface can be set to 5 mm or less.

[0465] As Fig. 27 shown, Fig.21 the chief ray angle (CRA) in the optical system and the imaging device module as Fig.33 shown can be 10 degrees or more, for example, in the range of 10 degrees to 35 degrees or in the range of 10 degrees to 25 degrees. As Fig.33 shown, it can be seen that the peripheral 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 according to the temperature change from low temperature to high temperature, the difference in the peripheral illuminance (zoom positions 1, 2, 3) from low temperature to high temperature is almost the same up to 4.4 mm from the optical axis.

[0466] Figures 28 to 30 is a graph showing the diffraction MTF of the Fig.21 optical system at room temperature, low temperature, and high temperature, and is a graph showing modulation according to spatial frequency. As Figure 27 to Figure 29As shown, in the third embodiment of the present invention, the deviation of the MTF at a low temperature or a high temperature based on the room temperature may be less than 10%, that is, less than 7% or less. Figure 31 to Figure 33 It is shown Fig.21 Curve diagram of the aberration characteristics of the optical system at room temperature, low temperature and high temperature. Figure 31 to Figure 33 The graphs from left to right are graphs measuring spherical aberration (longitudinal spherical aberration), astigmatism field curve, and distortion. The graph of spherical aberration is a graph of light having a wavelength band of about 435nm, about 486nm, about 546nm, about 587nm, and about 656nm, and the graphs of astigmatism and distortion are graphs of light having a wavelength band of about 546nm. Figure 31 to Figure 33 In the aberration diagram of , it can be explained that the closer each curve at room temperature, low temperature, and high temperature is to the Y axis, the better the aberration correction function is, and it can be seen that the optical system 1000 according to the third embodiment has a measurement value close to the Y axis in almost all regions. Therefore, it can be seen that Figure 30 to Figure 32 The decrease in modulation from low temperature to high temperature is less than 10%, such as 5% or less, or hardly changes.

[0467] Table 5 compares the changes in optical characteristics such as EFL, BFL, F number, TTL and FOV of the optical system according to the third embodiment at room temperature, low temperature and high temperature, and it can be seen that the change rate of the optical characteristics at low temperature based on room temperature is 5% or less, for example, 3% or less, and it can be seen that the change rate of the optical characteristics at low temperature based on room temperature is 5% or less, for example, 3% and less.

[0468] [Table 5]

[0469] Room temperature Low temperature high temperature Low temperature / room temperature High temperature / room temperature EFLF 15.800 15.770 15.838 99.81％ 100.24％ BFL 2.414 2.411 2.417 99.88％ 100.14％ F# 1.600 1.597 1.604 99.82％ 100.23％ TTL 40.000 39.941 40.069 99.85％ 100.17％ FOV 32.418 32.454 32.374 100.11％ 99.86％

[0470] Therefore, as shown in Table 5, 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 the change rate of FOV, is 10% or less, that is, 5% or less, for example, in the range of 0 to 5%. This means that even if at least one or two or more plastic lenses are used, the temperature compensation of the plastic lenses can be designed to prevent the reliability of the optical characteristics from being deteriorated.

[0471] The optical system 1000 according to the third embodiment can satisfy at least one or two or more of the various formulas described below. When the optical system 1000 satisfies at least one formula, 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 center of the FOV but also in the periphery. In addition, the optical system 1000 can have improved resolution. In addition, the meaning of the thickness of the lens at the optical axis OA and the interval between adjacent lenses at the optical axis OA described in the various formulas can refer to the above-mentioned embodiments.

[0472] [Equation 84] 0.5 <CT6 / CT7<2

[0473] Formula 84 sets the difference in the center thickness of the plastic lens, the sixth lens, and the seventh lens, so that the chromatic aberration of the optical system can be improved, and preferably, 1≤CT6 / CT7<1.5 can be satisfied. In addition, the manufacturing accuracy of the sixth lens and the seventh lens can be relaxed, and the optical performance of the center and periphery of the FOV can be improved.

[0474] [Equation 85] 0.5 <CT1 / ET1<2

[0475] In Formula 85, CT1 means the thickness (mm) of the first lens 121 on the optical axis OA, and ET1 means the thickness at the edge of the effective area (that is, the end of the effective area of ​​the first lens 121). Formula 85 sets the center thickness and edge thickness of the first lens so that an element affecting the field of view of the optical system can be set, and an element affecting the effective focal length EFL can be set, and 1≤CT1 / ET1<1.25 can be preferably satisfied.

[0476] [Equation 86]Po1>0

[0477] In Formula 86, Po1 is represented by the positive refractive power of the first lens 121, and for the performance of the optical system, can be set to have a short effective focal length compared to TTL in the optical system. Therefore, the following condition can be satisfied: TTL>F, and, for example, TTL can be in the range of 1.5 times or more, for example, 1.5 times to 4 times the effective focal length F.

[0478] [Equation 87] 1.7 <n1<2.2

[0479] In Equation 87, n1 is the refractive index of the d-line of the first lens 121. Equation 87 sets the refractive index of the first lens to be high so that it can control the factor that reduces the third-order aberration (Seidel aberration) affecting the optical system and can reduce the aberration that appears when the TTL is slightly longer. Equation 4 is preferably satisfied as 1.75 < n1 < 2.1. If it is designed to be lower than the lower limit of Equation 4, the performance of reducing aberration can be obtained, but since the refractive power of the first lens is weakened, light cannot be collected, so the performance of the optical system may deteriorate. If the value of Equation 87 is designed to be higher than the upper limit, there is a disadvantage that it is difficult to obtain materials. In addition, if the refractive index of the first lens 121 is designed to be lower than the lower limit of Equation 87, in order to increase the refractive power of the first lens and the second lens, the curvature radii of the first lens and the second lens must be increased. In this case, lens manufacturing becomes more difficult, the lens defect rate increases, and the yield may decrease.

[0480] [Equation 87-1] 1.6 ≤ Aver(n1:n7) ≤ 1.7

[0481] In Equation 87-1, Aver(n1:n7) is the average value of the refractive index values of the d-lines of the first lens to the seventh lens. When the optical system 1000 according to the embodiment satisfies Equation 87-1, the optical system 1000 can set the resolution and suppress the influence on the TTL.

[0482] [Equation 87-2]

[0483] 1 < GLn_Aver / PLn_Aver < 1.2

[0484] GLn_Aver is the average value of the refractive indices of the lenses made of glass materials in the lens unit 100B, and PLn_Aver is the average value of the refractive indices of the plastic lenses. Lenses with high refractive indices are positioned on the object side of the plastic lenses, which can increase chromatic dispersion.

[0485] [Equation 88] 20 < FOV_H < 40

[0486] In Equation 88, FOV_H represents the horizontal field of view and can set the range of the vehicle optical system. Equation 88 is preferably satisfied as: 25 ≤ FOV_H ≤ 35, or in the range of 29.8 degrees ± 3 degrees, and at this time, the sensor length in the horizontal direction can be based on 8.064 mm ± 0.5 mm. In addition, if Equation 88 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%. In addition, even if one or more, for example, two or more plastic lenses are mixed and used in the optical system 1000, the deterioration of the optical characteristics can be prevented by temperature compensation of the plastic lenses.

[0487] [Equation 89] L1R1 > 0

[0488] If Equation 89 is satisfied, the shape of the optical system can be restricted. The object-side surface of the first lens 121 is formed in a convex manner to prevent foreign matter from adhering to or accumulating on this surface. Additionally, since the first lens 121 refracts incident light in the optical axis direction, the effective diameter of the second lens 122 can be reduced. Therefore, the distance between the first lens 121 and the second lens 122 can be increased.

[0489] [Equation 89-1] L1R2 > 0

[0490] [Equation 89-2] L2R1 < 0 and L2R2 < 0

[0491] Since the first lens 121 has a meniscus shape that bulges toward the object side, this first lens can refract light to the edge of the second lens 122 with a small effective diameter. Additionally, since the second lens 122 has a convex meniscus shape toward the sensor side, the effective diameter of the cemented lens 134 can be stably ensured. Additionally, since the following condition is satisfied: L3R1 > |L2R2|, the light can be adjusted so that the effective diameter of the sensor-side lenses (i.e., the sixth lens 126 and the seventh lens 127) is not large, and the TTL can be reduced. If the following condition is satisfied: L3R1 < |L2R2|, there are problems such as aberration occurring, the effective diameter of the sensor-side lenses increasing, or the TTL increasing.

[0492] [Equation 89-3] L5R1 > 0, L5R2 < 0

[0493] Since the fifth lens has a convex shape on both sides, the effective diameter of the sixth lens 126 and the seventh lens 127 can be refracted so that the effective diameter is not large, and the TTL can be reduced and the number of lenses can be decreased. Additionally, since the following condition is satisfied: L5R1 > L5R2, the light can be adjusted so that the effective diameter of the sensor-side lenses (i.e., the sixth lens 126 and the seventh lens 127) is not large, and the TTL can be reduced. If the following condition is satisfied: L3R1 < L3R2, there are problems such as aberration occurring between the object-side surfaces of the first lens and the second lens, or the effective diameter of the sensor-side lenses increasing, or the TTL increasing.

[0494] [Equation 90] 2 < L7S2_max_sag to Sensor < 6

[0495] In Equation 90, L7S2_max_sag to Sensor can be the straight-line distance from the maximum Sag value of the seventh lens 127 to the image sensor 300. If this equation is satisfied, the TTL can be reduced, and conditions for manufacturing the imaging device module can be set. Additionally, L7S2_max_sag to Sensor can set the space where filters 500 and cover glass 400 located between the image sensor 300 and the seventh lens 127 can be placed. When the range of Equation 7 is less than the lower limit, the space for placing circuit structures such as filters and image sensors becomes restricted, and the process of assembling circuit structures such as filters and image sensors into the optical system may become difficult. When the range of Equation 90 is greater than the upper limit, the process of assembling circuit structures such as filters and image sensors into the optical system is easy, but the TTL becomes longer, making it difficult to miniaturize the optical system. That is, Equation 90 can set the minimum distance between the image sensor 300 and the last lens, and preferably satisfies: 4 < L7S2_max_sag to Sensor < BFL. Additionally, since the last lens has a concave curvature radius on the sensor side, this last lens can refract light into the effective area of the image sensor 300. The above BFL is the optical axis distance from the image sensor 300 to the center of the sensor side of the last lens. Specifically, if the following conditions can be satisfied: 4.2 < L7S2_max_sag to Sensor < 5, manufacturing convenience and TTL reduction are easier.

[0496] [Equation 91] 0.1 < CT1 / CT7 < 5

[0497] If Equation 91 is satisfied, the aberration characteristics can be improved and the reduced impact on the optical system can be set. Equation 91 can preferably satisfy: 0.5 < CT1 / CT7 < 1. Equation 91 can set the lenses on both sides of the optical system to be made of a glass lens and a plastic lens and limit the difference in their center thicknesses. Therefore, the chromatic aberration of the optical system can be improved, good optical performance can be achieved under the set field of view, and the TTL (total track length) can be controlled.

[0498] [Equation 91-1] 0 < CT1 / CA11 < 1

[0499] In Equation 91, the central thickness CT1 of the first lens 121 and the effective diameter CA11 of the object-side surface S1 of the first lens 121 can be set, and if this equation is satisfied, deterioration of the strength and optical characteristics of the injection-molded lens made of glass can be prevented. If it is below the range of Equation 1, the lens may be damaged or injection molding may be difficult, and if it is greater than the above range, the TTL can increase and the weight of the optical system may become heavier. Preferably, 0 < CT1 / CA11 < 0.5 can be satisfied.

[0500] [Equation 92] 0 < CT1 / CT6 < 3

[0501] In Equation 92, CT6 means the central thickness of the sixth lens 126. If the optical system satisfies Equation 92, the aberration characteristics can be improved and a reduced influence on the optical system can be set. Equation 9 can preferably be satisfied: 0 < CT1 / CT6 < 1. Equation 92 can improve the chromatic aberration of the optical system by setting the difference in the central thicknesses of the first lens and the sixth lens.

[0502] [Equation 93] 1 < CT34 / CT6 < 5

[0503] In Equation 93, CT34 is the central thickness of the third lens and the fourth lens. If the optical system satisfies Equation 93, the aberration characteristics can be improved by setting the thicknesses of the cemented lens made of plastic material and the sixth lens 126, and preferably 1 < CT34 / CT6 < 4 or 1 < CT34 / CT6 ≤ 2.5 can be satisfied. CT34 can be greater than the central thickness of each of the first lens to the seventh lens. Here, the following condition can be satisfied: CT34 > ET34.

[0504] [Equation 94] 0 < L2R1 / L4R2 < 1

[0505] If the optical system 1000 according to the embodiment satisfies Equation 11, the optical system 1000 can have improved aberration characteristics.

[0506] [Equation 95] 0 < CT34 – ET34 < 2

[0507] In Equation 95, ET34 is the optical axis distance from the end of the effective region of the object-side surface of the third lens 123 to the end of the effective region of the sensor-side surface of the fourth lens 124. If the optical system satisfies Equation 95, the central thickness and the edge thickness of the cemented lens can be set to improve the aberration characteristics, and preferably 0.5 ≤ CT34 / ET34 < 1.5 can be satisfied. ET34 can be greater than the edge thickness of each of the first lens to the seventh lens.

[0508] [Equation 96] 0 < CA11 / CA31 < 2

[0509] If equation 96 is satisfied, the optical system 1000 can control incident light and set elements that affect aberrations, and can preferably satisfy equation 1. <CA11 / CA31<1.8。

[0510] [Formula 97]0 <CA72 / CA42<2

[0511] If equation 97 is satisfied, the optical system 1000 can control the incident light path and set the element of performance variation according to CRA and temperature. Preferably, equation 97 can satisfy: 0.4 <CA72 / CA_L4S2<1.0。

[0512] [Equation 98]0 <CA12 / CA21<2

[0513] If equation 98 is satisfied, the optical system 1000 can control the light traveling to the first lens group LG1 and the second lens group LG2, and can set a factor that affects the reduction of lens sensitivity. Equation 98 may preferably satisfy: 1 <CA12 / CA21<1.8。

[0514] [Formula 99]0 <CA31 / CA42<2

[0515] If the optical system 1000 satisfies Formula 99, the effective diameter of the cemented lens may be set to a size smaller than the effective diameter of the first lens 121 and larger than the effective diameter of the seventh lens 127. Formula 99 may preferably satisfy: 0≤CA31 / CA42<1.

[0516] [Formula 100]0 <CA31 / CA32<2

[0517] When the optical system 1000 satisfies the formula 100, the optical system 1000 can improve chromatic aberration and set the size between the object side surface and the sensor side surface of the third lens on the object side in the cemented lens. Therefore, by setting the size of the effective diameter of the third lens arranged on the object side to be larger than the size of the plastic lens, the light incident through the cemented lens can be effectively guided to the plastic lens. The formula 100 can preferably satisfy: 0≤CA31 / CA32<1. That is, the size of the effective diameter is designed to gradually decrease from the fourth lens to the sixth lens made of plastic, so that the light can be refracted and guided to the sixth lens and the seventh lens having relatively small effective diameters.

[0518] [Formula 100-1] CA4>CA_PL1

[0519] In Formula 10-1, CA4 is the size of the effective diameter (average effective diameter) of the fourth lens 124, and CA_PL1 may be the size of the effective diameter (average effective diameter) of the plastic lens closer to the object side relative to the sensor when there are two plastic lenses.

[0520] [Formula 101] <CA41 / CA42<2

[0521] When the optical system 1000 satisfies the formula 18, the optical system 1000 can improve chromatic aberration, and the size between the object side surface and the sensor side surface of the fourth lens on the sensor side in the cemented lens 134 can be set. Therefore, the effective diameter of the fourth lens closer to the object side relative to the plastic lens can be set. The formula 101 can preferably satisfy: <CA51 / CA52<1.5。

[0522] [Formula 101-1] 1.7 <CA61-CA62<4

[0523] In formula 101-1, the effective diameter difference between the object side surface L6S1 and the sensor side surface L6S2 of the sixth lens can exceed 1.7, can be greater than the effective diameter difference (mm) of other lenses, and can be the largest in the optical system. Therefore, by setting the effective diameter difference between the object side surface and the sensor side surface of the first plastic lens to the maximum, the light refracted by the sixth lens can be guided to the effective area of ​​the last lens.

[0524] [Formula 101-2] CA5>CA4>CA6

[0525] [Formula 101-3] CA41>(Imgh*2)

[0526] [Formula 101-4] CA51 ≥ (Imgh*2)

[0527] [Formula 101-5] CA62<(Imgh*2)

[0528] In Equations 101-2 to 101-5, the effective diameter of the fifth lens 125 , the effective diameter of the object-side surface of the fourth lens 124 , and the effective diameter of the object-side surface of the fifth lens 125 may set an optical path to the region of the image sensor 300 .

[0529] In an embodiment, the fifth lens is a glass lens disposed on the object side of the plastic lens and is disposed closest to the plastic lens such that the ratio of the effective diameter of the object side surface to the sensor side surface of the fifth lens can satisfy Equation 101-2 or Equation 101-4. Conversely, when the plastic lens closest to the object side is disposed at the n-3rd, n-4th, or n-5th position (n = 6 to 8), the ratio of the effective diameter of the object side surface GL1_S1 to the sensor side surface GL1_S2 of the glass lens disposed on the object side surface of the plastic lens closest to the plastic lens and simultaneously disposed at the n-3rd, n-4th, or n-5th plastic lens can satisfy: 1 < CA_GL1_S1 / CA_GL1_S2 < 2, or the difference in the effective diameter (mm) between the object side surface GL1_S1 and the sensor side surface GL1_S2 of the glass lens can satisfy: 1.7 < CA_GL1_S1 - CA_GL_S2 < 3.

[0530] Equation 101 can further satisfy Equation 101-6.

[0531] [Equation 101-6] 1.1 ≤ Last_GL_CAS1 / Last_GL_CAS2 ≤ 1.5

[0532] In Equation 101-6, Last_GL_CAS1 means the effective diameter CAS1 of the object side surface of the last glass lens Last_GL in the optical system, and Last_GL_CAS2 means the effective diameter CAS2 of the sensor side surface of the last glass lens Last_GL in the optical system.

[0533] [Equation 101-7] 2 < L5R1 / (CA51 / 2) < 5

[0534] When the fifth lens 125 with a convex side satisfies Equation 101-7, the optical system 1000 can improve chromatic aberration. If it is less than the lower limit value of Equation 101-7, the occurrence of aberration on the ninth surface increases, and if it is greater than the upper limit value, the occurrence of aberration on the ninth surface decreases, but since the curvature radius of the tenth surface must be smaller, the occurrence of aberration on the tenth surface increases, and there is a problem of affecting the aberration of the sixth lens and the seventh lens. Preferably, if the range can satisfy: 2 < L3R1 / (CA31 / 2) < 3, the curvature radius of the sixth surface S6 can be designed to be large while reducing the aberration occurring on the fifth surface S5, making it easier to manufacture the third lens 123. The aberration occurring in the optical system can be reduced, and the production of the 3rd lens 123 can be made easier, thereby increasing the yield.

[0535] [Equation 102] 0.2 < CA_GL_AVER / CA_PL_AVER < 2.2

[0536] In Equation 102, CA_GL_AVER means the average effective diameter of the glass lens, and CA_PL_AVER means the average effective diameter of the plastic lens. In Equation 102, by setting the effective diameter sizes of the glass lens and the plastic lens, the path of the incident light can be effectively guided. Equation 102 preferably satisfies: 1.1 < CA_GL_AVER / CA_PL_AVER < 1.5. Here, nGL > nPL can be satisfied. nGL is the number of lenses made of glass material, and nPL is the number of plastic lenses.

[0537] [Equation 103] 1.1 ≤ GL_CAS1_AVER / PL_CAS1_AVER ≤ 1.6

[0538] In Equation 103, GL_CAS1_AVER is the average of the effective diameters of the object sides of the glass lenses, for example, the average of the effective diameters of the object sides of the first lens to the fifth lens. PL_CAS1_AVER is the average of the effective diameters of the object sides of the plastic lenses, for example, the average of the effective diameters of the object sides of the sixth lens and the seventh lens. Since the effective diameter size of the plastic lens is designed to be relatively small compared to the effective diameter size of the glass lens, Equation 20 can be satisfied. This is because the effective diameter of the sensor side of the lens closest to the plastic lens (i.e., the fifth lens) is designed to be small, and the radius of curvature of the sixth lens is designed to be small, so that light can be guided to the effective area of the plastic lens with a relatively small effective diameter. Therefore, the average of the object sides of the glass lenses can be designed to be larger than the effective diameter of the object side of the plastic lens. Equation 103 preferably satisfies: 1.20 ≤ GL_CAS1_AVER / PL_CAS1_AVER ≤ 1.55.

[0539] [Equation 104] CA6, CA7 < CA5

[0540] If Equation 104 is satisfied, the optical system can guide light to the center and periphery of the image sensor 300 and improve chromatic aberration by setting the effective diameter of the plastic lens disposed between the fifth lens 125 and the image sensor 300 to be smaller than the effective diameter of the fifth lens 125.

[0541] [Equation 105] CG2 < CG6 < CG1

[0542] In Formula 105, CG2 may be the center distance between the second lens and the third lens, CG6 may be the center distance between the sixth lens and the seventh lens, and CG1 may be the center distance between the first lens and the second lens. If Formula 22 is satisfied, the center distances between the first lens, the second lens, the sixth lens, and the seventh lens may be set so that the center distances may be reduced and the optical performance of the peripheral portion of the FOV may be improved.

[0543] [Formula 105-1] G4<0.01or CG4<0.01

[0544] In Formula 105-1, G4 and CG4 may set the distance and the center distance between the third lens 123 and the fourth lens 124. G4 may include a distance on the optical axis or / and a distance on the edge. If Formula 105-1 is satisfied, the third lens and the fourth lens may be set as a cemented lens. Here, CT34=CT3+CT4+CG3 may preferably be satisfied. The center thicknesses CT3 and CT4 of the third lens and the fourth lens and the center distance CG3 of the third lens and the fourth lens may be set.

[0545] [Formula 106]1 <CT7 / CG6<4

[0546] In Formula 106, CG6 is the center distance or optical axis distance between the sensor-side surface of the sixth lens 126 and the object-side surface of the seventh lens 127. In Formula 106, by setting the center thickness CT7 of the seventh lens 127 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. Formula 106 preferably satisfies: 2.5 <CT7 / CG6<3。

[0547] [Formula 107]2*CT3 <CT2<CG1

[0548] In Formula 107, by setting the center distance between the first lens and the second lens and the center thickness of the second lens to the maximum, the resolution and chromatic aberration can be improved, and the center distances between the third lens to the seventh lens can be reduced.

[0549] [Formula 108]2*CT6 <CG1<2*CT5

[0550] By setting the center thicknesses of the fifth lens and the sixth lens in Formula 108, chromatic aberration can be improved and the center distances between the sensor-side lenses (ie, the third lens to the seventh lens) can be reduced.

[0551] [Formula 108-1] 0.3 < (CT1 + CG1 + CT2) / TTL < 0.45

[0552] Since the center thickness CT1 of the first lens and the center thickness CT2 of the second lens and the center distance CT2 between the first lens and the second lens are arranged to exceed 30% of TTL, the focal length of light incident on the optical system can be designed so that the effective radius does not increase due to each lens surface.

[0553] [Formula 109]1 <CT2 / CT1<4

[0554] In Formula 109, by setting the center thickness CT2 of the second lens to be thicker than the center thickness CT1 of the first lens, the factors affecting the aberration can be controlled. Preferably, Formula 109 can satisfy: 1.1 <CT2 / CT1<2。

[0555] [Formula 110]1 <L7R1 / CT7<20

[0556] In Formula 110, by setting the radius of curvature of the object side surface of the seventh lens and the center thickness CT7 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 peripheral parts of the field of view. Preferably, Formula 110 can satisfy: 1 <L7R1 / CT7<10。

[0557] [Formula 111] 0<|L5R2 / L7R1|<10

[0558] In Formula 111, by setting the curvature radius of the sensor-side surface of the fifth lens and the curvature radius of the object-side surface of the seventh lens, the refractive power of the fifth lens and the seventh lens can be controlled. Therefore, good optical performance can be achieved at the center and peripheral parts of the field of view. Preferably, Formula 111 can satisfy: 1<|L5R2 / L7R1|<7.

[0559] [Equation 112] L3R1*L4R2<0

[0560] In Formula 112, L3R1 means the curvature radius of the object-side surface of the third lens, and L4R2 means the curvature radius of the sensor-side surface of the fourth lens. When Formula 112 is satisfied, the refractive power of the cemented lens can be controlled, thereby controlling the light path incident on the plastic lens. Formula 112 can satisfy the following condition: 100<|L4R1*L5R2|.

[0561] [Equation 113] 0<|L5R1 / L4R2|<2

[0562] In Formula 113, L5R1 means the curvature radius of the object-side surface of the fifth lens. In Formula 113, by setting the curvature radii of the sensor-side surface of the fourth lens and the object-side surface of the fifth lens, light can be effectively refracted from the cemented lens toward the plastic lens. Formula 113 may preferably satisfy: <L5R1 / L4R2<1。

[0563] [Formula 113-1]|LR|_Min <PL1_R1

[0564] Here, |LR|_Min means the minimum curvature radius among all lenses, and PL1_R1 means the curvature radius of the object-side surface of the plastic lens closest to the object side. If Formula 113-1 is satisfied, the plastic lens is arranged closer to the sensor than the sensor-side surface of the glass lens having the minimum curvature radius, so that light can be refracted toward the incident surface of the plastic lens.

[0565] [Formula 114] <L6R2 / L6R1<2

[0566] In Formula 114, by setting the curvature radii of the object side surface and the sensor side surface of the sixth lens, the plastic lens can effectively refract the incident light toward the image sensor. Formula 114 can preferably satisfy: 0<|L6R2 / L6R1|<1. Here, the following conditions can be satisfied: L6R1>0, L6R2>0, and L6R1 <L6R2。

[0567] [Formula 114-1]0 <L7R1 / L7R2<2

[0568] In Formula 114-1, L7R1 and L7R2 mean the curvature radii of the object side surface and the sensor side surface of the seventh lens. In Formula 114-1, by setting the curvature radii of the object side surface and the sensor side surface of the seventh lens, light can be refracted through the plastic lens to the image sensor 300. Formula 114-1 preferably satisfies: 0<|L7R1 / L7R2|<1. Here, the following conditions may be satisfied: L7R1>0, L7R2>0, and L7R2 <L7R1。

[0569] [Formula 114-2] 0.5 <L6R1 / L7R1<1.5

[0570] [Formula 114-3] 0.5 <L7R2 / L6R1<1.5

[0571] By reducing the difference in curvature radius between the lens surfaces of the sixth lens 126 and the seventh lens 127 , light may be stably guided toward the image sensor 300 .

[0572] [Formula 115] <CT_Max / CG_Max<5

[0573] In Equation 115, the maximum central thickness CT_Max among the lenses and the maximum distance CT_Max between adjacent lenses can be set. If Equation 115 is satisfied, the optical system can have good optical performance at the focal length at the set field of view, and the TTL can be reduced. Preferably, 0 < CT_Max / CG_Max < 1 can be satisfied.

[0574] [Equation 116] 1 < ΣCT / ΣCG < 5

[0575] Equation 16 can satisfy: 2 < ΣCT / ΣCG < 4.5.

[0576] [Equation 117] 8 < ΣNd < 30

[0577] Equation 117 can preferably satisfy: 10 < ΣNd < 20.

[0578] [Equation 118] 10 < ΣVd / ΣNd < 50

[0579] Equation 118 can satisfy: 10 < ΣVd / ΣNd < 40.

[0580] [Equation 119] Distortion < 2

[0581] Equation 119 can satisfy: Distortion ≤ 1.5.

[0582] [Equation 120] 0 < ΣCT / ΣET < 2

[0583] Equation 120 can satisfy: 0.5 < ΣCT / ΣET < 1.5.

[0584] [Equation 121] 0.5 < CA11 / CA_min < 2.5

[0585] Equation 121 can preferably satisfy: 1 < CA11 / CA_min < 2.

[0586] [Equation 122] 0.5 < CA_max / CA_min < 2

[0587] Equation 122 can satisfy: 1 < CA_max / CA_min < 2. Here, the maximum effective diameter is the second surface S2 of the first lens 121, and the minimum effective diameter is the fourteenth surface S14 of the seventh lens 127.

[0588] [Equation 123] 1 < CA_max / CA_Aver < 3

[0589] Equation 123 can satisfy: 1 < CA_max / CA_Aver < 1.5.

[0590] [Equation 124] 0.5 < CA_min / CA_Aver < 2

[0591] Equation 124 can satisfy: 0.5 < CA_min / CA_Aver < 1.

[0592] [Equation 125] 1 < CA_max / (2*ImgH) < 3

[0593] Equation 125 can satisfy: 1 < CA_max / (2*ImgH) < 2.

[0594] [Equation 126] 1 < TD / CA_max < 4

[0595] Equation 126 can satisfy: 1.5 < TD / CA_max < 3.

[0596] [Equation 127] 1 < F / CA61 < 10

[0597] In Equation 127, F can be 10 mm or greater, for example, in the range of 10 mm to 20 mm. In Equation 127, the relationship between the effective focal length and the effective diameter of the object side surface of the plastic lens is set so that the influence on the reduction of the optical system such as TTL can be controlled. Equation 127 can preferably satisfy: 1 < F / CA61 < 5. Here, F1 is 121 mm or greater, for example, in the range of 121 mm to 182 mm. F2 is -128 mm or less, for example, in the range of -128 mm to -193 mm. F3 is -17 mm or less, for example, in the range of -17 mm to 27 mm. F4 is 13 mm or greater, for example, in the range of 13 mm to 21 mm. F5 is 17 mm or greater, for example, in the range of 17 mm to 26 mm. F6 is -38 mm or less, for example, in the range of 38 mm to -57.5 mm. F7 is -311 mm or less, for example, in the range of -311 mm to -467 mm. The sum of the focal lengths of the first lens to the sixth lens can be set to 5 mm or greater, for example, in the range of 5 mm to 8 mm. The balance of the respective focal lengths of the first lens to the fifth lens can suppress the difference in the pint position caused by temperature changes. Therefore, the optical characteristics of the imaging lens can be suppressed from deteriorating due to temperature changes.

[0598] The aperture stop is arranged on the object side of the second lens 122. The focal length of the lens arranged on the sensor side that is larger than the aperture and closest to the aperture stop is greater than 0. In an embodiment of the present invention, the focal length F1 of the first lens 121 should be designed to be greater than 0. In this case, the first lens 121 collects light so that the effective diameter of the third lens to the seventh lens can be prevented from increasing, and the third lens to the seventh lens are lenses arranged closer to the sensor than the second lens 122. In addition, since the TTL can be prevented from becoming longer, miniaturization of the optical system is possible. The composite focal length of the lens arranged on the sensor side that is larger than the aperture stop, that is, the lens arranged closer to the sensor than the aperture stop, is designed to be greater than 0. In an embodiment of the present invention, the composite focal length of the third lens to the seventh lens can be designed to be greater than 0. In this case, the optical system can be miniaturized by reducing the TTL at the horizontal field of view FOV_H of 25 degrees to 35 degrees.

[0599] [Equation 128] <F / L1R1<1

[0600] Formula 128 can satisfy: 0.2≤F / L1R1≤0.85.

[0601] [Equation 129]Max_th / Min_th<3

[0602] In Formula 129, Max_th is the thickness of the thickest area of ​​the lens, and Min_th is the thickness of the thinnest area of ​​the lens. Max_th / Min_th is the ratio of the thickest thickness to the thinnest thickness of each lens. The thickest thickness Max_th of the lens may be the center thickness CT of the lens, and the thinnest thickness Min_th of the lens may be the edge thickness ET of the lens, but the opposite is also possible. The thickest thickness Max_th of the lens may be the edge thickness ET of the lens, and the thinnest thickness Min_th of the lens may be the center thickness CT of the lens. The edge thickness ET means the thickness at the end of the effective lens. If Formula 129 is satisfied, the optical system can control the influence on the effective focal length. Formula 129 may preferably satisfy: 2 <Max_th / Min_th≤2.8。

[0603] Here, the ratio of the maximum thickness to the minimum thickness of the plastic lens can satisfy the following conditions. Max_PL_th can be the thickness value of the thickest region of the plastic lens, and Min_PL_th can be the thickness value of the thinnest region of the plastic lens. Max_PL_th can be the central thickness CT of the plastic lens, and Min_PL_th can be the edge thickness ET of the plastic lens. The edge thickness ET means the thickness at the end of the effective lens. The reverse case is also possible. Max_PL_th can be the edge thickness ET of the plastic lens, and Min_PL_th can be the central thickness CT of the plastic lens. The edge thickness ET means the thickness at the end of the effective diameter.

[0604] Condition 1: 1.0 < Max_PL_th / Min_PL_th < 2.5

[0605] If the value of the above Condition 1 is less than the lower limit, it is difficult to manufacture the plastic lens. That is, it is manufactured by injecting a high-temperature resin and hardening it at a low temperature, but if the thickness difference is large, the lens may shrink unevenly when cooled at a low temperature, which may result in a high surface defect rate. In addition, if it is outside the range of Condition 1, the plastic lens will shrink and expand as the temperature changes from -40 degrees to 105 degrees, and during this process, the rate of change of the lens shape significantly appears, which may deteriorate the optical performance. Preferably, the following conditions can be satisfied: 1.0 < PL_CT / PL_ET < 2 or 1.1 < PL_Max_CT / PL_Min_CT < 1.5.

[0606] [Equation 129-1] 3 < Max(EG / CG) < 50

[0607] In Equation 129-1, Max(EG / CG) can set the value of the maximum ratio of the center distance CG between adjacent lenses to the edge thickness EG. When Equation 129-1 is satisfied, the optical system can adjust the influence on the effective focal length. Equation 129-1 can preferably be satisfied: 10 < Max(EG / CG) ≤ 40. The condition of Max(EG / CG) can be the distance between the fifth lens and the sixth lens.

[0608] [Equation 129-2] 1 < Min(CT / ET) < 1.5

[0609] In Equation 129-2, Min(CT / ET) can set the value of the minimum ratio of the center thickness and the edge thickness of each lens. If Equation 129-2 is satisfied, the optical system can control the influence on the effective focal length. Equation 129-2 can preferably be satisfied: 1 < Min(CT / ET) ≤ 1.1.

[0610] [Equation 130] 0 < EPD / L1R1 < 1

[0611] If equation 130 is satisfied, the optical system 1000 can control the incident light. Equation 47 can preferably satisfy: <EPD / L1R1≤0.8。

[0612] [Formula 131]-10 <F1 / F3<0

[0613] If Equation 131 is satisfied, the resolution can be improved by controlling the refractive powers of the first lens and the third lens, and the TTL and EFL can be affected.

[0614] [Formula 131-1]|F3|>F4

[0615] [Formula 131-2]|F3| <F6

[0616] [Formula 131-3]F5<|F7|

[0617] In Formula 131-1 to Formula 131-3, the focal length of the fifth lens closest to the plastic lens can be greater than the focal length of the fourth lens and smaller than the focal lengths of the sixth lens and the seventh lens. Therefore, the refractive power of the last glass lens can be controlled to effectively guide the plastic lens.

[0618] [Equation 132]Po3*Po4<0

[0619] Po3 is the refractive power value of the third lens, and Po4 is the refractive power value of the fourth lens. That is, the refractive powers of the third lens and the fourth lens have opposite refractive powers, so that aberration can be improved and light can be effectively guided by the plastic lens. If the value of Po4*Po5 is greater than 0, the effect of improving chromatic aberration as a cemented lens may be minimal.

[0620] [Formula 132-1]Po1(Po4*Po5)<0

[0621] [Formula 132-2] F34>0

[0622] [Formula 132-3] F3*F4<0

[0623] Po1 is the refractive power value of the first lens, and F34 is the composite focal length of the third lens and the fourth lens. When equations 132-1 to 132-3 are satisfied, it is easy to improve the aberration of the optical system having the cemented lens, and the incident light can be effectively guided to the plastic lens. Here, the first lens 121 and the second lens 122 have opposite focal lengths, and the dispersion value difference is arranged between 20 and 60, so that the chromatic aberration can be compensated for each other.

[0624] [Formula 133] 15 <v4-v3<60

[0625] In Formula 13, v3 is the Abbe number of the third lens, and v4 is the Abbe number of the fourth lens. When Formula 133 is satisfied, the difference between the Abbe numbers of at least two lenses forming the cemented lens can be maintained at a certain value or greater, and chromatic aberration can be improved. Formula 133 preferably satisfies: 20≤v4-v3≤55. If the cemented lens is smaller than the lower limit of Formula 133, it may not be significant in improving the aberration characteristics of the optical system. Therefore, if the difference in the Abbe number between the object side lens and the sensor side lens in the cemented lens is 20 or greater and 55 or less, the aberration characteristics can be improved.

[0626] [Formula 134] <F1 / F<20

[0627] Equation 134 sets the relationship between the focal length F1 of the first lens and the effective focal length F, thereby setting the TTL of the optical system. Equation 134 preferably satisfies: 5 <F1 / F<15。

[0628] [Equation 135] 0<|F5 / F6|<1

[0629] Formula 135 may preferably satisfy: 0<|F5 / F6|<0.7.

[0630] [Equation 136] 0<|F5 / F7|<1

[0631] Formula 136 may preferably satisfy: 0<|F5 / F7|<0.2.

[0632] [Equation 137] 0<|F6 / F1|<1

[0633] Formula 137 may preferably satisfy: 0.5<|F6 / F1|<0.5.

[0634] [Equation 138] <F27 / F<2

[0635] In Formula 138, the relationship between the composite focal length F27 of the second to seventh lenses and the effective focal length F is set so that 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 138 preferably satisfies: 0.5 <F27 / F<1.5。

[0636] [Equation 139] 0<|F27 <F6|<1

[0637] In Formula 139, the relationship between the composite focal length F27 of the second to seventh lenses and the focal length F6 of the sixth lens is set so that the composite refractive power of the second to seventh lenses and the refractive power of the plastic lens can be controlled to improve the resolution, and the optical system can be provided in a slim and compact size. Formula 139 preferably satisfies: 0<|F27 <F6|<0.8。

[0638] [Formula 140] 0<|F27 <F7|<1

[0639] In Formula 140, the relationship between the composite focal length F27 of the second to seventh lenses and the focal length F7 of the seventh lens is set so that the refractive power of the second to seventh lenses and the refractive power of the last plastic lens can be adjusted to improve the resolution, and the optical system can be provided in a slim and compact size. Formula 140 preferably satisfies: 0<|F27 <F7|<0.5。

[0640] [Equation 141] 0<|F6 / F|<5

[0641] Formula 141 preferably satisfies: 1<|F6 / F|<4.

[0642] [Equation 142] F_LG1 / F_LG2>0

[0643] In Formula 142, 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 142 may preferably satisfy: 2 <F_LG1 / F_LG2<20。

[0644] [Formula 143]1 <nGL / nPL<4

[0645] In Formula 60, by arranging the number nPL of lenses made of plastic material to be 1 times the number nGL of glass lenses, the thickness of the optical system can be reduced, and a wider range of refractive power can be provided by the aspherical surface. Formula 143 preferably satisfies: 1 <nGL / nPL<3。

[0646] [Formula 144] CA2 <CA5<CA1

[0647] In Formula 144, the size relationship of the average effective diameters CA1, CA2, and CA5 of the object side surface and the sensor side surface of the first lens, the second lens, and the fifth lens can be set. If Formula 144 is satisfied, the first lens group and the second lens group can be set, and the aberration can be improved by the first lens of the second lens group LG2. CA1 can have the largest effective diameter in the optical system.

[0648] [Equation 145] 0<ΣPL_CT / ΣGL_CT<1

[0649] Formula 145 preferably satisfies: 0<ΣPL_CT / ΣGL_CT<0.5.

[0650] [Equation 146] 0 < ΣPL_Nd / ΣGL_Nd < 1

[0651] In Equation 146, ΣPL_Nd is the sum of the refractive indices of the plastic lenses at the d-line, and ΣGL_Nd is the sum of the refractive indices of the glass lenses at the d-line. If Equation 146 is satisfied, the overall resolution can be controlled by setting the refractive index relationship between the plastic lenses and the glass lenses. Equation 146 can preferably satisfy: 0 < ΣPL_Nd / ΣGL_Nd < 0.5.

[0652] [Equation 147] 10 mm < TTL < 50 mm

[0653] In Equation 147, TTL can be set to be more than 10 mm or 20 mm, thereby providing an optical system for the vehicle. Equation 147 can preferably satisfy: 35 mm < TTL < 45 mm or the condition of TD < TTL.

[0654] [Equation 148] 2 mm < ImgH

[0655] Equation 148 can set the diagonal size (2 * ImgH) of the image sensor 300 and can provide an optical system with a vehicle sensor size. Equation 148 can preferably satisfy: 4 mm ≤ ImgH < 8 mm.

[0656] [Equation 149] 2 mm < BFL < 7 mm

[0657] Equation 149 can preferably satisfy: 2.5 mm < BFL ≤ 6.5 mm. If BFL is less than the range of Equation 149, some of the light traveling to the image sensor may not be transmitted to the image sensor, which may be the reason for the resolution reduction. If BFL exceeds the range of Equation 149, stray light may be introduced, which may deteriorate the aberration characteristics of the optical system.

[0658] [Equation 150] 0.5 < BFL / CG1 < 2

[0659] In Equation 150, BFL is set to be less than the distance between the lenses, for example, the center distance CG1 between the first lens and the second lens, so that the installation space for the filter 500 and the cover glass 400 can be ensured, and the assemblability of the components can be improved by the distance between the image sensor 300 and the last lens, and the bonding reliability can be improved. Equation 150 can satisfy: 0.5 < BFL / CG1 ≤ 1.

[0660] [Equation 151] CG4, CG5, CG6 < BFL

[0661] In Formula 151, BFL is set to be larger than the spacing between the lenses, for example, the center distance CG4 between the fourth lens and the fifth lens, the center distance CG5 between the fifth lens and the sixth lens, and the center distance CG6 between the sixth lens and the seventh lens, so that the installation space of the filter 500 and the cover glass 400 can be ensured, and the assemblability of the components can be improved by the spacing between the image sensor 300 and the last lens, and the bonding reliability can be improved. In addition, the last lens (seventh lens) can disperse the incident light to the effective area of ​​the image sensor, but if BFL does not satisfy Formula 151, some of the emitted light may not be transmitted to the effective area of ​​the image sensor, which may deteriorate the resolution.

[0662] [Formula 152] 3mm <F<40mm

[0663] Formula 152 can set the total focal length F to suit the vehicle optical system. Formula 152 can satisfy: 5mm <F<30mm。

[0664] [Equation 153] FOV < 45 degrees

[0665] It can meet the following requirements: 20 degrees ≤ FOV ≤ 40 degrees.

[0666] [Formula 154]1 <TTL / CA_max<5

[0667] Formula 154 can preferably satisfy: 1.5 <TTL / CA_max≤4。

[0668] [Formula 155]2 <TTL / ImgH<15

[0669] Formula 155 can preferably satisfy: 4 <TTL / ImgH<10。

[0670] [Equation 156] 0.1 <BFL / ImgH<2

[0671] Formula 156 can preferably satisfy: 1 <BFL / ImgH<1.5。

[0672] [Formula 157]1 <TTL / BFL<20

[0673] Formula 157 can preferably satisfy: 4 <TTL / BFL<10。

[0674] [Equation 158] 1.5 <TTL / F<4

[0675] Equation 158 can set the total focal length F and the total optical axis length TTL of the optical system 1000. Accordingly, an optical system for a driver assistance system can be provided. Equation 158 can preferably satisfy: 2 ≤ TTL / F ≤ 3 or 2.2 ≤ TTL / F ≤ 2.8. When the optical system 1000 according to an embodiment satisfies Equation 158, the optical system 1000 can have an appropriate focal length within a set TTL range, and can provide an optical system that can maintain an appropriate focal length and form an image even when the temperature changes from low to high. When less than the lower limit of Equation 75, it is necessary to increase the refractive power of the lens, making it difficult to correct spherical aberration or distortion aberration, and when exceeding the upper limit of Equation 75, the effective diameter or TTL of the lens becomes longer, which may cause problems with magnification of the imaging lens system.

[0676] [Equation 159] 1 < F / BFL < 10

[0677] Equation 159 can preferably satisfy: 1 < F / BFL < 3.

[0678] [Equation 160] 1 < F / ImgH < 5

[0679] Equation 160 can preferably satisfy: 2 < F / ImgH < 4.1.

[0680] [Equation 161] 1 < F / EPD < 5

[0681] Equation 161 can preferably satisfy: 1 < F / EPD < 3.

[0682] [Equation 162] 0 < BFL / TD < 0.3

[0683] Equation 162 can preferably satisfy: 0 < BFL / TD < 0.2. When the conditional value of BFL / TD is 0.2 or greater, since BFL is designed to be larger compared to TD, the size of the entire optical system becomes large, making it difficult to miniaturize the optical system, and the distance between the seventh lens and the image sensor becomes long, which may increase the amount of unnecessary light passing through the seventh lens and the image sensor, resulting in problems such as deterioration of aberration characteristics and reduced resolution.

[0684] [Equation 163] 0 < EPD / Imgh / FOV < 0.2

[0685] Equation 163 can preferably satisfy: 0 < EPD / Imgh / FOV < 0.1.

[0686] [Equation 164] 5 < FOV / F# < 40

[0687] Equation 164 can preferably satisfy: 10 < FOV / F# < 30. Here, F# is set to 1.6 or less to provide a bright image.

[0688] [Equation 165] 1<ΣGL_CT / F#<20

[0689] Formula 165 may preferably satisfy: 5<ΣGL_CT / F#<10.

[0690] [Equation 166] 1<ΣPL_CT / F#<20

[0691] Formula 166 may preferably satisfy: 5<ΣPL_CT / F#<10.

[0692] [Equation 167] 1<ΣGL_Nd / F#<20

[0693] The relationship between the sum of the refractive indices ΣGL_Nd of the glass lenses of the optical system and the F number (F#) may be set in equation 167. Equation 167 may preferably satisfy: 1<ΣGL_Nd / F#<10.

[0694] [Equation 168] 1<ΣPL_Nd / F#<10

[0695] The relationship between the sum of the refractive indices ΣPL_Nd of the plastic lenses of the optical system and the F number (F#) can be set in equation 168. Equation 168 preferably satisfies: 1<ΣPL_Nd / F#<5.

[0696] [Equation 169] 0.5 < 0 <Max_Sag61 / Max_Sag62<0.5<1.5

[0697] In Formula 169, Max_Sag61 is the maximum sag value on the object-side surface of the sixth lens, and Max_Sag62 is the maximum sag value on the sensor-side surface of the sixth lens. When Formula 169 is satisfied, the refractive power can be improved by adjusting the thickness and the radius of curvature of the sixth lens. Formula 169 preferably satisfies: 0.8 <Max_Sag61 / Max_Sag62<1.2。

[0698] [Equation 170] 0.5 <Max_Sag71 / Max_Sag72<1.5

[0699] In Formula 170, Max_Sag71 is the maximum sag value on the object side surface of the seventh lens, and Max_Sag72 is the maximum sag value on the sensor side surface of the seventh lens. If Formula 170 is satisfied, the thickness and the radius of curvature of the seventh lens may be adjusted to improve the refractive power. Formula 170 may preferably satisfy: 0.8 <Max_Sag71 / Max_Sag72<1.2。

[0700] Here, the maximum Sag values ​​of the sixth lens and the seventh lens may satisfy the following conditions.

[0701] 1)Max_Sag61>Max_Sag71

[0702] 2)Max_Sag62>Max_Sag72

[0703] [Formula 171] <CG6 / G6_min<10

[0704] In Formula 171, CG6 is the center distance between the sixth lens and the seventh lens, and G6_Min is the minimum distance between the sixth lens and the seventh lens. Therefore, the distance between the two lenses made of plastic can be set. Preferably, the following conditions can be satisfied: 3 <CG6 / G6_min<7。

[0705] [Formula 172]0.05<|Sag_i / (CA_i / 2)|<0.2(i=S1, S2, S3, S4)

[0706] Formula 172 can set the relationship between the sag values ​​of the first surface to the fourth surface S1, S2, S3 and S4 of the first lens and the second lens and the effective diameter CA, and if the relationship is satisfied, the refractive power of the lens can be improved. Here, if Formula 172 also satisfies the condition of n1>1.7, the first lens 121 and the second lens 122 can gather light with sufficient power without sharply designing the curvature radius of the first lens and the second lens within the effective diameter.

[0707] [Formula 173]

[0708]

[0709] In Formula 173, Z may mean 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 mean the distance from any position on the aspherical surface to the optical axis in the direction perpendicular to the optical axis. C may mean the curvature of the lens, and K may mean the cone constant. In addition, A, B, C, D, E, and F may mean aspherical coefficients.

[0710] The optical system 1000 according to the third embodiment can satisfy at least one or two or more of the formulas, and can have improved optical characteristics, improved resolution, and improved aberration and distortion characteristics. In addition, the optical system 1000 can ensure the BFL for applying the vehicle image sensor 300, compensate for the degradation of the optical characteristics due to temperature changes, and minimize the distance between the last lens and the image sensor 300, thereby providing good optical performance at the center and peripheral parts of the FOV.

[0711] Table 6 shows the terms of the above formula in the optical system 1000 of the embodiment, including TTL, BFL, effective focal length F, ImgH (mm), effective diameter CA (mm), thickness (mm), TD (mm), which are the optical axis distance from the first surface S1 to the fourteenth surface S14 of the optical system 1000, the focal length F1 to F7 (mm) of each of the first lens to the seventh lens, the sum of the refractive index, the sum of the Abbe number, the sum of the thickness (mm), the sum of the distances between adjacent lenses, the effective diameter characteristics, the sum of the refractive index of the glass lens, the sum of the refractive index of the plastic material, FOV (degrees), the edge thickness ET, the focal length of the first lens group and the second lens group, and the F number, etc.

[0712] [Table 6]

[0713]

[0714]

[0715] Table 7 shows the result values ​​of the above-mentioned equations 84 to 133 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 84 to 133. Therefore, the optical system 1000 can have good optical performance and excellent optical characteristics at the center and periphery of the FOV.

[0716] [Table 7]

[0717]

[0718]

[0719]

[0720]

[0721]

[0722] Table 8 shows the result values ​​of the above-mentioned equations 134 to 172 in the optical system 1000 of the fourth 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 134 to 172. Therefore, the optical system 1000 can have good optical performance and excellent optical characteristics at the center and periphery of the FOV.

[0723] [Table 8]

[0724]

[0725]

[0726]

[0727]

[0728] Fig.36 This is an example of a plan view of a vehicle to which a camera device module or an optical system according to an embodiment of the present invention is applied. Refer to Fig.36 Fig.36 , a vehicle camera device 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 device module 31 disposed in the vehicle, and may capture an image of the front of the vehicle and / or the driver to generate an image of the front or inside of the vehicle. The image generation unit 11 may use the camera device module 31 to capture images of the front of the vehicle and around the vehicle in one or more directions to generate an image of the surroundings of the vehicle. Here, the front and surrounding images may be digital images, and may include color images, black and white images, and infrared images. Additionally, the front and surrounding images 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 device placed in its own vehicle, and detects the front of its own vehicle to generate first detection information. Specifically, the first information generation unit 12 is placed in its own vehicle, and detects the position and speed of the vehicle located in front of its own vehicle, whether there are pedestrians, and the position, etc., to generate first detection information.

[0729] Using the first detection information generated by the first information generation unit 12, the distance between its own vehicle and the vehicle in front can be controlled to be maintained at a constant level, and the stability of vehicle operation can be increased in a preset specific situation, for example, when the driver wants to change the driving lane of its own vehicle or when reversing for parking. The first information generation unit 12 provides the first detection information to the control unit 14. The second information generation units 21, 22, 23, 24, 25, and 26 detect each side of its own vehicle based on the front image generated by the image generation unit 11 and the first detection information generated by the first information generation unit 12 to generate second detection information. Specifically, the second information generation units 21, 22, 23, 24, 25, and 26 may include at least one radar and / or camera device disposed on its own vehicle, and may detect the position and speed of the vehicle located on the side of its own vehicle or capture an image. Here, the second information generation units 21, 22, 23, 24, 25, and 26 may be disposed on each of the front corners, side mirrors, rear center, and rear corners of its own vehicle.

[0730] At least one information generating unit of these vehicle camera systems may be equipped with an optical system and camera module having the same optical system as described in the above-mentioned embodiments, and may provide or process information acquired through the front, rear, each side or corner area of ​​the vehicle to the user to achieve autonomous driving or protect the vehicle and objects from surrounding safety. The optical system of the camera module according to the embodiments of the present invention may be installed in multiple units in the vehicle to enhance safety regulations, autonomous driving functions and increase convenience.

[0731] In addition, the optical system of the camera module is used in vehicles as a component for control, such as a lane keeping assist system (LKAS), a lane departure warning system (LDWS), and a driver monitoring system (DMS). Such a vehicle camera module can achieve stable optical performance even under changes in ambient temperature, and can provide a module with competitive prices, thereby ensuring the reliability of vehicle components.

[0732] 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 only 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 of the embodiment for other embodiments. Therefore, the content related to such combination and modification should be interpreted as being included in the scope of the present invention. In addition, although the embodiments have been described above, this is only an example and does not limit the present invention, and the above is illustrated to a person skilled in the art of the present invention within the scope of the essential features of the present embodiment. 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 embodiment can be realized by modification. And the differences related to 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, include: The first lens to the seventh lens are aligned along the optical axis from the object side toward the sensor side, Wherein, the refractive power of the first lens is negative, Wherein, the composite refractive power of the third lens to the seventh lens is positive, wherein the first lens has a meniscus shape convex toward the sensor side on the optical axis, The center distance between the first lens and the second lens is greater than the center thickness of each of the first lens to the seventh lens. Wherein, the first lens to the seventh lens include a plurality of spherical lenses and a plurality of aspherical lenses, wherein the spherical lens is a lens whose object side surface and sensor side surface are spherical on the optical axis, wherein the aspherical lens is a lens whose object side surface and sensor side surface on the optical axis are aspherical, At least one of the plurality of aspherical lenses is made of a material different from that of the spherical lens.

2. The optical system according to claim 1, in, The number of spherical lenses is at least twice the number of aspherical lenses.

3. The optical system according to claim 1, in, At least one of the plurality of aspherical lenses is made of the same glass material as the spherical lens, and at least another one of the plurality of aspherical lenses is made of plastic.

4. The optical system according to claim 1, in, The first to sixth lenses are made of glass, and the seventh lens is made of plastic.

5. The optical system according to claim 4, in, The second to sixth lenses are spherical lenses, Wherein, the first lens and the seventh lens are aspherical lenses, The effective diameter of the first lens is greater than the effective diameter of each of the fourth to seventh lenses.

6. The optical system according to any one of claims 1 to 4, include: an aperture stop disposed on the periphery between the second lens and the third lens, Wherein, the first lens has a shape with two sides concave on the optical axis.

7. An optical system according to any one of claims 1 to 4, in, A sensor-side surface of the fourth lens is bonded to an object-side surface of the fifth lens.

8. An optical system according to any one of claims 1 to 5, in, The center distance between the i-th lens and the i+1-th lens is CGi, Wherein, the center thickness of the i-th lens is CTi, Among them, when i is 1, the value of CTi / CGi is the smallest. Among them, when i is 3, the value of CTi / CGi is the largest.

9. The optical system according to any one of claims 1 to 5, in, The center distance between the first lens and the second lens is greater than the sum of the center thicknesses of two adjacent lenses from the first lens to the seventh lens, wherein the Abbe numbers of the first to fourth lenses are 50 or greater, Among them, the lens having the largest refractive index among the first lens to the seventh lens is the fifth lens.

10. An optical system, include: a first lens group having lenses of a first material aligned along an optical axis from an object side toward a sensor side; a second lens group having a lens of a second material disposed on the sensor side of the lens of the first material and aligned along the optical axis, wherein the number of lenses of the first material is at least twice the number of lenses of the second material, wherein a first lens in the first lens group closest to the object has a convex object-side surface and a concave sensor-side surface, Wherein, the first lens has positive refractive power, wherein the last lens in the second lens group closest to the image sensor has a convex object-side surface and a concave sensor-side surface, wherein the last lens has negative refractive power, and The first material and the second material are different materials.

11. The optical system according to claim 10, in, The first material is a glass material, wherein the second material is a plastic material, wherein the object side surface and the sensor side surface of the first lens have aspherical surfaces, wherein an object-side surface and a sensor-side surface of each of the lenses of the second material have aspherical surfaces.

12. The optical system according to claim 10, in, The refractive index of the first lens is greater than 1.75, wherein the optical axis distance from the center of the object side surface of the first lens to the image surface of the image sensor is TTL, wherein the optical axis distance from the center of the object-side surface of the last lens to the image surface of the image sensor is BFL, Among them, the following formula is satisfied: 4 <TTL / BFL<10。 13. An optical system according to any one of claims 10 to 12, in, The optical axis distance from the center of the object-side surface of the final lens to the image surface of the image sensor is BFL, Wherein, 1 / 2 of the diagonal length of the image sensor is ImgH, Among them, the following formula is satisfied: 1 <BFL / ImgH<1.5。 14. An optical system according to any one of claims 10 to 12, in, The effective focal length of the optical system is F, wherein the optical axis distance from the center of the object side surface of the first lens to the image surface of the image sensor is TTL, wherein the optical axis distance from the center of the object-side surface of the last lens to the image surface of the image sensor is BFL, Among them, the following formula 1 is satisfied: 2≤TTL / F≤3 Among them, the following formula 2:1 is satisfied <F / BFL<3。 15. An optical system according to any one of claims 10 to 12, in, The first lens group includes first to fifth lenses, Wherein, the second lens group includes the sixth lens to the seventh lens, Wherein, the seventh lens is the last lens, Wherein, the focal length of the first lens is greater than the composite focal length of the second lens to the seventh lens.

16. The optical system according to claim 15, in, The center thickness of the second lens is the largest among the center thicknesses of the first lens to the seventh lens, The center distance between the first lens and the second lens is the largest among the center distances between adjacent lenses and is greater than the center thickness of the second lens.

17. A camera module, include: Image sensor; first to seventh lenses aligned along the optical axis from the object side toward the sensor side; An aperture stop disposed between the spherical lenses among the first lens to the seventh lens; as well as a filter between the seventh lens and the image sensor, wherein the first lens and the seventh lens are made of the same material, and the material of the lens disposed on the object side of the aperture stop is different from the material of the lens disposed on the sensor side of the aperture stop, Wherein, the refractive power of the seventh lens is negative, a cemented lens, wherein the cemented lens is arranged among the first to seventh lenses, between the aperture stop and the image sensor, wherein two different lenses are cemented, Wherein, at least one of the lenses between the cemented lens and the image sensor is an aspherical lens.

Images