Optical system and camera module

Abstract

An optical system according to 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; the combined 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. A center thickness of the first lens is greater than a center thickness of each of the second to seventh lenses; the first to seventh lenses include a plurality of aspheric lenses. And each of the plurality of aspheric lenses may have a meniscus shape protruding from the optical axis toward the object side.

Description

Technical Field

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

[0002] ADAS (Advanced Driver Assistance System) is an advanced driver assistance system for assisting the driver in driving, and consists of sensing the situation ahead, determining the situation based on the sensed result, and controlling the behavior of the vehicle based on the situation determination. For example, an ADAS sensor device detects the vehicle ahead and identifies the lane. Then, when 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 controlled. Generally, ADAS can be implemented as an automatic parking system, a low-speed city driving assistance system, a blind spot warning system, etc. The sensor devices used to sense the situation ahead in ADAS are GPS sensors, laser scanners, front radars, and lidars, and the most representative one is a front camera for photographing the front of the vehicle.

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

[0004] In particular, the most important element for a camera module to obtain an image is an imaging lens that forms the image. Recently, interest in high efficiency such as high image quality and high resolution is increasing, and research on an optical system including a plurality of lenses is being conducted in order to achieve this. However, there is a problem because when a camera is exposed to a harsh environment such as high temperature, low temperature, moisture, and 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 consistently derive excellent optical characteristics and aberration characteristics. Therefore, a new optical system and camera that can solve the above-mentioned problems are required. Summary of the invention

[0005] Technical issues

[0006] Embodiments of the present invention provide an optical system and a camera module having improved optical characteristics. Embodiments provide an optical system and a camera module that prevent changes in optical characteristics in a low-temperature to high-temperature environment and have excellent optical performance.

[0007] Embodiments of the present invention provide a camera module in which an inner lens barrel is doubly disposed in at least a portion of an outer lens barrel. Embodiments provide a camera module having heterogeneous lens barrels disposed around different lenses, for example, a first lens barrel in contact with an outer surface of at least one lens and a second lens barrel in contact with an outer surface of at least one lens.

[0008] Embodiments of the present invention may provide a camera module having a first lens barrel in contact with an outer surface of a lens of a first material and a second lens barrel in contact with an outer surface of a lens different from the first material. Embodiments of the present invention may provide a camera module having a first lens barrel in contact with an outer surface of a plurality of lenses adjacent to an object side and a second lens barrel in contact with an outer surface of a lens adjacent to a sensor side. Embodiments of the present invention may provide a camera module in which a second lens barrel of a second material is arranged on a sensor side of a first lens barrel of a first material, and lenses are stacked in the first lens barrel and the second lens barrel.

[0009] Embodiments of the present invention can provide a mobile device and a vehicle having a camera module.

[0010] Technical Solution

[0011] An optical system according to an embodiment of the present invention includes: a first lens to a seventh lens, which are aligned along the optical axis from the object side toward the sensor side, wherein the refractive power of the first lens is negative, and the combined 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, the center thickness of the first lens is greater than the center thickness of each of the second lens to the seventh lens, and the first lens to the seventh lens include a plurality of aspherical lenses, and each of the plurality of aspherical lenses may have a meniscus shape convex toward the object side on the optical axis.

[0012] According to an embodiment of the present invention, the effective diameter of the first lens may be greater than the effective diameters of the fourth to seventh lenses. An aperture stop may be provided on a periphery between the second lens and the third lens. A plurality of aspherical lenses may be provided closer to the image sensor than the aperture stop. The first to seventh lenses are made of glass, and the number of lenses having spherical object side and sensor side surfaces may be at least twice the number of lenses having aspherical object side and sensor side surfaces. The first to fifth lenses may be spherical lenses. The sensor side surface of the fourth lens and the object side surface of the fifth lens may be bonded.

[0013] 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 2, the value of CTi / CGi can be the smallest. When i is 1, the value of CTi / CGi can be the largest.

[0014] According to an embodiment of the present invention, the center thickness of the first lens is CT1, and the distance of the optical axis from the center of the object-side surface of the first lens to the surface of the image sensor is TTL, and the following formula can be satisfied: 0 < CT1 / TTL < 0.25. The center thickness of the first lens is CT1, the center distance between the second lens and the third lens is CG2, and the following formula can be satisfied: 2 < CT1 / CG2 < 5.

[0015] A camera module according to an embodiment of the present invention includes: an image sensor; and 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 to seventh lenses; and an optical filter disposed between the seventh lens and the image sensor, wherein the first lens has a meniscus shape convex toward the sensor side on the optical axis, the first lens and the seventh lens have negative refractive powers, the combined refractive power of the third to seventh lenses is positive, and cemented lenses of the second to seventh lenses are disposed between the aperture stop and the seventh lens and are joined to each other, wherein the cemented lens has a convex object-side surface and a concave sensor-side surface on the optical axis, and the first to seventh lenses include a plurality of aspherical lenses, and the plurality of aspherical lenses are arranged closer to the image sensor than the aperture stop, and the object-side surface and the sensor-side surface of the first to fifth lenses may have a spherical shape.

[0016] According to the present invention, the aperture stop is disposed on the periphery between the second lens and the third lens, and the object-side surface and the sensor-side surface of the sixth lens and the seventh lens may have an aspherical shape.

[0017] A camera module according to an embodiment of the present invention includes: a first lens group having a plurality of lenses; a second lens group having at least one lens; a first barrel disposed around the first lens group; and a second barrel disposed between the first barrel and the second lens group, wherein the lenses of the first lens group and the lenses of the second lens group are aligned on the optical axis, and the first barrel and the second barrel are made of different materials, and the materials of the lenses of the first lens group and the second lens group are different from each other, and the lens material of the second lens group may be the same as the material of the second barrel.

[0018] According to an embodiment of the present invention, the lens material of the second lens barrel and the second lens group may be a plastic material. The first lens barrel may be made of aluminum, the second lens barrel may be made of plastic, and at least two or more lenses disposed on the object side among the lenses inside the first lens barrel may be made of glass, and the lens disposed inside the second lens barrel may include two plastic lenses. A cemented lens is included between a glass lens and a plastic lens, wherein the object side lens in the cemented lens is separated from the inner surface of the first lens barrel, the sensor side lens in the cemented lens is in contact with the inner surface of the second lens barrel, and the cemented lens may be made of glass. A vehicle or a portable terminal according to an embodiment of the present invention may include the camera module disclosed above.

[0019] Beneficial Effects

[0020] The optical system and 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 thicknesses, refractive powers, and distances from adjacent lenses. Therefore, the optical system and 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 periphery of the field of view.

[0021] 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 (approximately -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 a change in refractive index caused by a temperature change, the lenses can compensate for each other. That is, the optical system can effectively perform the distribution of refractive power in the range from low temperature to high temperature, and prevent or minimize changes in optical characteristics in the 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.

[0022] In addition, the optical system and the camera module according to the embodiment can meet the set field of view and achieve excellent optical characteristics by mixing aspherical lenses and spherical lenses. As a result, the optical system can provide a thinner vehicle camera module. Therefore, the optical system and the camera module can be provided for various applications and devices, and can have excellent optical characteristics even in a harsh temperature environment, for example, when exposed to the outside of the vehicle in summer or in a high-temperature vehicle interior.

[0023] According to an embodiment of the present invention, by stacking lenses in a heterogeneous lens barrel, a camera module capable of maintaining resolution according to temperature changes can be provided. That is, the camera module with a heterogeneous lens barrel can minimize the stress and centrifugation generated by the plastic lens according to temperature changes. By providing heterogeneous lenses in a heterogeneous lens barrel, a camera module capable of maintaining resolution according to temperature changes and suppressing temperature deformation can be provided. This can improve the optical reliability of the camera module and improve the reliability of a vehicle-mounted camera device having the camera module. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a side cross-sectional view of an optical system and a camera module having the same according to a first embodiment.

[0025] Figure 2 Is used to explain the Figure 1 A side cross-sectional view of the relationship between the nth lens and the n-1th lens in FIG.

[0026] Figure 3 It is shown Figure 1 A table of lens characteristics of an optical system.

[0027] Figure 4 It is shown Figure 1 Table of aspheric coefficients of lenses in the optical system.

[0028] 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.

[0029] Figure 6 It shows that according to Figure 1 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.

[0030] 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.

[0031] Figure 8 Is to show about Figure 1 A graph of the diffraction MTF data of an optical system at low temperatures.

[0032] Fig. 9 Is to show about Figure 1 A graph of the diffraction MTF data of an optical system at high temperature.

[0033] Fig.10 Is to show about Figure 1 A graph of data of aberration characteristics of an optical system at room temperature.

[0034] Fig.11 Is to show about Figure 1 A graph showing the aberration characteristics of an optical system at low temperatures.

[0035] Fig.12 Is to show about Figure 1 A graph showing data on aberration characteristics of an optical system at high temperatures.

[0036] Fig.13 is a side cross-sectional view of an optical system and a camera module having the same according to a second embodiment.

[0037] Fig.14 It is shown Fig.13 A table of lens characteristics of an optical system.

[0038] Fig.15 It is shown Fig.13 Table of aspheric coefficients of lenses in the optical system.

[0039] 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.

[0040] Fig.17 It shows that according to Fig.13 Table of CRA data at room temperature, low temperature, and high temperature for the position of the image sensor in the optical system.

[0041] Fig.18 Is to show about Fig.13 A graph of the diffraction MTF data of an optical system at room temperature.

[0042] Fig.19 Is to show about Fig.13 A graph of data of aberration characteristics of an optical system at room temperature.

[0043] Fig. 20 is a graph showing relative illumination of height of an image sensor according to an embodiment.

[0044] Fig.21 is an example of a cross-sectional side view of a camera module according to a third embodiment of the present invention.

[0045] Fig. 22 It is shown Fig.21 FIG. 1 is a diagram of a sensor side area of ​​a first lens barrel in a camera module.

[0046] Fig.23 is the explanation Fig. 22 FIG. 1 is a diagram of a combination of a second lens barrel and a sensor-side lens of a camera module.

[0047] Fig.24 is the explanation Fig. 22 Figure 2.2 shows a diagram of the second lens barrel.

[0048] Fig.25 (A) (B) is the combination of lenses Fig. 22 Example of the second lens barrel.

[0049] Fig.26 yes Fig.21 Another example of a second lens barrel in a camera module.

[0050] Fig. 27 1 is a diagram for explaining a first gap G1 between the outermost side of the second lens barrel and the inner side of the first lens barrel in a camera module according to a third embodiment of the present invention.

[0051] Fig.28 1 is a diagram explaining a second gap G2 between an object-side surface of a second lens barrel and a sensor-side lens having a material different from that of the second lens barrel in a camera module according to a third embodiment of the present invention.

[0052] Fig.29 1 is a diagram for explaining a third gap G3 between an outer surface of a second lens barrel and a first lens barrel in a camera module according to a third embodiment of the present invention.

[0053] Fig.30 and Fig.31 is the explanation Fig.21 FIG. 1 is a diagram of the process of combining the camera module.

[0054] Fig.32 is an example of a vehicle having an optical system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0055] 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, and 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 described, the terms (including technical terms and scientific terms) used in the embodiments of the present invention can be interpreted with the meaning that can be generally understood by ordinary technicians in the field to which the present invention belongs, and common terms such as terms defined in dictionaries should be able to interpret their meanings in consideration of the contextual meaning of the relevant technology.

[0056] 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 a phrase, the singular form may also include the plural form, and in the case of stating at least one (or one or more) of A and (and) 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 first, second, A, B, (a) and (b) may be used. Such terms are only used to distinguish the components from other components and may not be determined by the properties, sequence or process of the corresponding constituent elements by terms. And when a component is described as being "connected", "coupled" or "engaged" to another component, the description may include not only direct connection, coupling or engagement to another component, but also "connection", "coupling" or "engagement" through another component between the component and the other component. In addition, in the case of being described as being formed or arranged "above (upper)" or "below (lower)" each component, the description includes not only when the two components are in direct contact with each other, but also when one or more other components are formed or arranged between the two components. In addition, when expressed as “over” or “under”, it can refer to a downward direction as well as an upward direction with respect to an element.

[0057] In the description of the present invention, "object side surface" may refer to the surface of the lens facing the object side relative to the optical axis OA, and "sensor side surface" may refer to the surface of the lens facing the imaging surface (image sensor) relative to the optical axis. The convex surface of the lens may mean a convex shape on the optical axis or the paraxial region, and the concave surface of the lens may mean a concave shape on the optical axis or the paraxial region. The radius of curvature, the center thickness, and the distance between the lenses described in the table for lens data may be an average value on the optical axis, and the unit is mm. The vertical direction may mean a direction perpendicular to the optical axis, and the end of the lens or the lens surface may mean the end or edge of the effective area of ​​the lens through which the incident light passes. Depending on the measurement method, the size of the effective diameter on the lens surface may have a measurement error of up to ±0.4 mm. The near-axis 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.

[0058] like Figure 1 and Fig.13As shown, the optical systems 1000 and 1001 according to the first and second embodiments of the present invention may include a plurality of lens groups LG1 and LG2. Specifically, each of the plurality of lens groups LG1 and LG2 includes at least one lens. For example, the optical systems 1000 and 1001 may include a first lens group LG1 and a second lens group LG2 sequentially arranged from the object side toward the image sensor 300 along the optical axis OA. The number of lenses in each of the first lens group LG1 and the second lens group LG2 may be different from each other. The number of lenses in the second lens group LG2 may be greater than the number of lenses in the first lens group LG1, and may be, for example, more than four or five times greater than the number of lenses in the first lens group LG1.

[0059] The first lens group LG1 may include at least one lens. The first lens group LG1 may have three or fewer lenses. The first lens group LG1 may preferably include one or two lenses. The second lens group LG2 may include two or more lenses. The second lens group LG2 may include four or more lenses, and preferably includes five lenses. The optical systems 1000 and 1001 may include n lenses, the nth lens may be the last lens, and the (n - 1)th lens may be the lens closest to the last lens. n is an integer greater than or equal to 5, for example, 5 to 8.

[0060] When the first lens group LG1 is two lenses on the object side and the second lens group LG2 is the remaining lenses, the combined focal length of the first lens group LG1 can be defined as F_LG1, and when the combined focal length of the second lens group LG2 is F_LG2, the following conditions in absolute value are satisfied: F_LG2 < F_LG1, and the first embodiment may satisfy: F_LG1 > 0, F_LG2 > 0, and the second embodiment may satisfy: F_LG1 < 0 and F_LG2 > 0. Conversely, when the first lens group LG1 is a single lens on the object side and the second lens group LG2 is the remaining lenses, the focal length of the first lens group LG1 can be defined as F_LG1, and when the combined focal length of the second lens group LG2 is F_LG2, the following condition is satisfied: |F_LG2| < |F_LG1|, and it may satisfy: F_LG1 < 0 and F_LG2 > 0.

[0061] At least one or all of the lenses of the first lens group LG1 may include a glass lens. At least one or all of the lenses of the second lens group LG2 may include a glass lens. Such a glass material has a small amount of change in expansion and contraction due to changes in external temperature, and the surface is not easily scratched, so that surface damage can be prevented. The second lens group LG2 may include four or more glass lenses, and may include, for example, four to seven glass lenses. The lenses of the first lens group LG1 and the second lens LG2 may all be glass lenses, and the amount of expansion and contraction of the lenses of the glass material due to temperature changes is smaller than that of the lenses of the plastic material, and degradation of optical characteristics can be prevented by thermal compensation. As another example, one or two lenses of the second lens group LG2 that are closest to the image sensor 300 may be made of plastic or may be provided as aspherical lenses.

[0062] The lens of the first lens group LG1 may be a spherical lens. The lens of the second lens group LG2 may include at least one aspherical lens and two or more spherical lenses. The aspherical lens is a lens whose object side surface and sensor side surface are aspherical, and the spherical lens is a lens whose object side surface and sensor side surface are spherical. The number of spherical lenses in the second lens group LG2 may be greater than the number of aspherical lenses. The aspherical lens can prevent spherical aberration in the optical systems 1000 and 1001, and since aberration does not occur even if the effective diameter increases, the camera module can be miniaturized and become lighter. The lens of the second lens group LG2 may include at least one non-molding material and at least one molding material. The aspherical lens may be a glass molding material. For example, in the second lens group LG2, the number of lenses of glass non-molding material may be greater than the number of lenses of glass molding material. The non-molding material and the molding material may both be glass materials, and the non-molding lens is a lens finely processed without injection molding, and the molding lens is an injection molded lens.

[0063] In the optical systems 1000 and 1001, a lens of a glass material is arranged, and since the rate of change of contraction and expansion due to temperature change is less than that of a plastic material, thermal compensation can be performed in the lens barrel, and degradation of optical characteristics due to temperature change can be suppressed. In addition, since the lens of the glass material includes at least two or more aspherical lenses, the occurrence of various aberrations can be suppressed. Among the lenses of the optical systems 1000 and 1001, a lens with a maximum Abbe number can be positioned in the second lens group LG2, and a lens with a maximum refractive index can be positioned in the first lens group LG1. The maximum Abbe number can be 65 or more, and the maximum refractive index can be 1.8 or more. The lens with the maximum Abbe number can reduce dispersion, and the lens with the maximum refractive index can increase the dispersion of incident light, and the center thickness can be thinner than the edge thickness. The lens with the maximum effective diameter in the optical systems 1000 and 1001 can be a lens close to the object side. Preferably, the lens with the maximum effective diameter can be a glass lens. The effective diameter of each lens may be the diameter of the effective area where the effective light is incident from each lens, and is the average of the effective diameter on the object side and the effective diameter on the sensor side. Embodiments of the present invention can reduce the weight of the camera module by further mixing aspherical lenses into the optical systems 1000 and 1001, provide more cost-effective manufacturing costs, and suppress the degradation of optical properties due to temperature changes. Each of the lenses may include an effective area and an ineffective area. The effective area may be an area through which light incident on each of the lenses passes. That is, 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 the effective light is not incident on a plurality of lenses. That is, the ineffective area may be an area that is not related to 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.

[0064] In the optical systems 1000 and 1001, the TTL (Total Top Length) can be twice as long as or longer than ImgH, for example, more than twice and less than 15 times. Preferably, the following condition can be satisfied: 4 < TTL / ImgH ≤ 10. The TTL (Total Track Length) is the distance in the optical axis OA from the center of the object-side surface of the first lens to the surface of the image sensor 300. ImgH is the distance from the optical axis OA to the diagonal end of the image sensor 300 or half of the maximum diagonal length. In the optical systems 1000 and 1001, the effective focal length (EFL) is provided to be 10 mm or greater, and the diagonal field of view (FOV) is provided to be less than 45 degrees, so that the optical system can be provided as a standard optical system in an in-vehicle camera module. For example, the optical system and the camera module according to an embodiment can be applied to the camera module of an ADAS (Advanced Driving Assistance System) installed inside or outside a vehicle. The optical systems 1000 and 1001 can have the condition that TTL / (2*ImgH) is 2.5 or greater, or 2.7 or greater, for example, can be in the range of 2.5 to 5, or 3 to 5. By setting the value of TTL / (2*ImgH) to 2.5 or greater using the optical systems 1000 and 1001, an in-vehicle lens optical system can be provided. The total number of lenses in the first lens group LG1 and the second lens group LG2 is 8 or less. Therefore, the optical systems 1000 and 1001 can provide an image without exaggeration or distortion of the formed image.

[0065] The length of the image sensor 300 is the maximum length of the diagonal in the direction orthogonal to the optical axis OA. The number of lenses with an effective diameter greater than the length of the image sensor 300 in the optical systems 1000 and 1001 is 50% or more, and the number of lenses with an effective diameter less than the length of the image sensor 300 is less than 50%, for example, in the range of 10% to 43%. At least one or all of the aspherical lenses in the optical systems 1000 and 1001 can have an effective diameter less than the length of the image sensor 300. The effective diameter of the lens closest to the object side in the lens portions 100, 100A can be greater than the effective diameter of the lens closest to the image sensor 300. Additionally, the effective diameters of the lenses arranged on the object side of the aperture stop ST and the lenses arranged on the sensor side can be greater 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 of the lenses, the optical systems 1000 and 1001 can control the incident light to compensate for the degradation of resolution and optical characteristics due to temperature changes, improve the chromatic aberration control characteristics, and improve the vignetting characteristics of the optical systems 1000 and 1001.

[0066] The optical systems 1000 and 1001 may include at least one cemented lens 145, 145A inside. The cemented lenses 145, 145A may be lenses in which two lenses having different focal lengths are bonded. The effective diameter of the lens arranged on the object side based on the cemented lenses 145 and 145A may be greater than the length of the image sensor 300. The effective diameter of the lens arranged on the sensor side based on the cemented lens may be greater than the length of the image sensor 300. In addition, the effective diameter of the object side lens of the cemented lenses 145 and 145A may be greater than the length of the image sensor 300, and the effective diameter of the sensor side lens may be arranged within the range of ±110% of the diagonal length of the image sensor 300. The cemented lenses 145 and 145A may be spherical lenses.

[0067] The first lens group LG1 and the second lens group LG2 may have a set distance on the optical axis OA. The optical axis distance between the first lens group LG1 and the second lens group LG2 on the optical axis OA may be an optical axis interval between a sensor-side surface of a lens closest to the sensor side among the lenses in the first lens group LG1 and an object-side surface of a lens closest to the object side among the lenses in the second lens group LG2.

[0068] The optical axis distance between the first lens group LG1 and the second lens group LG2 may be 1 times or less of the optical axis distance of the first lens group LG1, and may be, for example, in the range of 0.5 times to 1 times of the optical axis distance of the first lens group LG1. The optical axis distance between the first lens group LG1 and the second lens group LG2 may be 0.2 times or less of the optical axis distance of the second lens group LG2, and may be, for example, in the range of 0.01 times to 0.2 times of the optical axis distance of the second lens group LG2. 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. Here, among the lens surfaces of the first lens group LG1 and the second lens group LG2, two surfaces facing each other, for example, the sensor side surface of the object side lens, may be convex, and the object side surface of the sensor side lens may be concave. That is, the sensor side surface closest to the sensor side in the first lens group LG1 may be convex, and the object side surface closest to the object side in the second lens group LG2 may be concave. The first lens group LG1 may refract light incident through the object side to be condensed, and the second lens group LG2 may refract light emitted through the first lens group LG1 to the image sensor 300 .

[0069] The first lens group LG1 may have a negative (-) refractive power, and the second lens group LG2 may have a positive (+) or negative refractive power. In the first lens group LG1, the lens closest to the object side may have a negative (-) refractive power, and among the lenses of the second lens group LG2, the lens closest to the sensor side may have a negative (-) refractive power. That is, the composite focal length of the first lens and the second lens may have a positive focal length in the first embodiment and a negative focal length in the second embodiment, and the focal lengths of the third lens to the seventh lens may have a positive focal length in the first embodiment and the second embodiment. In addition, the refractive power of the first lens on the object side may have a negative value, and the composite focal lengths of the second lens to the seventh lens may have a positive value.

[0070] When the focal length is expressed as an absolute value, the focal length of the first lens group LG1 may be 1.5 times or more, for example, 1.5 to 5 times, the focal length of the second lens group LG2. The effective focal length (EFL) of the optical systems 1000 and 1001 may be smaller than the absolute value of the focal length of the first lens group LG1. The EFL of the optical systems 1000 and 1001 may be smaller than the absolute value of the focal length of the second lens group LG2.

[0071] The lens parts 100 and 100A may be a mixture of spherical lenses and aspherical lenses. The number of lenses of the aspherical lenses may be less than 50% of the total number of lenses, and may be in the range of 10% to 43%. When the absolute value of the focal length is expressed, 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 difference between the average effective diameter of the spherical lens and the average effective diameter of the aspherical lens may be greater than 1 mm, for example, in the range of 1.5 mm to 4 mm. 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. The average Abbe number of the spherical material lenses in the lens parts 100 and 100A may be less than the average Abbe number of the aspherical lenses. Because the lens adjacent to the image sensor 300 is arranged to have a low Abbe number and a high refractive index, dispersion can be improved at a position adjacent to the image sensor 300. The number of lenses having negative (-) refractive power may be less than the number of lenses having positive (+) refractive power in the optical systems 1000 and 1001. The number of lenses having negative (-) refractive power may be less than 60% of the total number of lenses, for example, in the range of 20% to 45%.

[0072] The sum of the refractive indexes of the lenses of the lens portions 100 and 100A of the embodiment may be 8 or more, for example, in the range of 8 to 15, and the average value of the refractive index may be in the range of 1.65 to 1.79. The sum of the Abbe numbers of each of the lenses may be 250 or more, for example, in the range of 250 to 370, and the average value of the Abbe number may be 55 or less, for example, in the range of 31 to 55. The sum of the center thicknesses of the entire lens may be 15 mm or more, for example, in the range of 15 mm to 30 mm or 20 mm to 35 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 5 mm. The sum of the center distances between the lenses on the optical axis OA may be 5 mm or more, for example, in the range of 5 mm to 10 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 and 100A may be provided as 8 mm or more, for example, in the range of 8 mm to 15 mm.

[0073] The F number of the optical system or camera module according to an embodiment 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 viewing angle (diagonal) in the optical system according to an embodiment of the present invention may be 50 degrees or less, for example, in the range of 20 degrees to 55 degrees or in the range of 25 degrees to 40 degrees. The vehicle optical system has a horizontal field of view FOV_H in the Y-axis direction, which may be greater than 20 degrees and less than 40 degrees, for example, in the range of 25 degrees to 35 degrees. In addition, the vertical field of view can be provided at an angle less than the horizontal field of view, and may be 20 degrees or less, for example, in the range of 10 degrees to 20 degrees. At this time, the sensor length in the horizontal direction Y 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 a field of view based on the horizontal length of the sensor. Therefore, it is possible to suppress changes in the focus position due to temperature changes, and provide a vehicle-mounted camera in which various aberrations are well corrected.

[0074] The optical systems 1000 and 1001 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 has sequentially passed through the lens portions 100 and 100A. 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 length of the image sensor 300 is the maximum length in the diagonal direction orthogonal to the optical axis OA, may be smaller than the effective diameter of the lens closest to the object side in the first lens group LG1, and may be larger than the effective diameter of the lens closest to the sensor side in the second lens group LG2. Here, the number of lenses having an effective diameter greater than the length of the image sensor 300 may be 4 to 5, and the number of lenses having an effective diameter less than the length of the image sensor 300 may be 1 to 3.

[0075] The optical systems 1000 and 1001 or the camera module may include an optical filter 500. The optical filter 500 may be placed between the second lens group LG2 and the image sensor 300. The optical filter 500 may be placed between the lens closest to the sensor side among the lenses of the lens parts 100 and 100A and the image sensor 300. For example, the optical systems 100 and 100A may be placed between the last lens and the image sensor 300. The cover glass 400 is disposed between the optical filter 500 and the image sensor 300, and may protect the upper portion of the image sensor 300 and prevent the reliability of the image sensor 300 from being degraded. The cover glass 400 may be removed. The optical filter 500 may include an infrared filter or an infrared cut filter. 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 is possible to prevent radiant heat emitted by external light from being transferred to the image sensor 300. In addition, the optical filter 500 may transmit visible light and reflect infrared light.

[0076] The optical systems 1000 and 1001 according to the embodiments can include an aperture stop ST. The aperture stop ST can adjust the amount of light incident on the optical systems 1000 and 1001. The aperture stop ST can be arranged between any two lenses in the lens parts 100 and 100A. In the lens arranged between the object and the aperture stop ST, the effective diameter of the lens tends to decrease from the object side to the aperture stop ST. In the lens arranged between the aperture stop ST and the image sensor 300, the effective diameter of the lens tends to decrease from the aperture stop ST to the sensor side. The meaning of "the effective diameter of the lens tends to decrease from the aperture stop ST to the sensor side" not only means that the effective diameter of the lens arranged between the aperture stop ST and the image sensor 300 decreases as it turns from the aperture stop ST to the sensor side, but also means that at least one lens surface can be larger than the object side lens surface. As in the embodiment of the present invention, the effective diameter of the lens arranged between the aperture stop ST and the image sensor also includes a case where it increases from the aperture stop ST to the sensor side and then decreases.

[0077] The first lenses 101 and 111 and the second lenses 102 and 112 may be disposed on the object side of the aperture stop ST, and the third lenses 103 and 113 and the fourth lenses 104 and 114 may be disposed on the sensor side of the aperture stop ST. When the aperture stop ST is disposed on the sensor side surface of the second lenses 102 and 112, the following conditions are 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 > effective diameter of the sensor side surface of the second lens (effective diameter of the aperture stop). The following conditions are satisfied: effective diameter of the sensor side surface of the second lenses 102 and 112 > effective diameter of the object side surface of the fourth lens > effective diameter of the sensor side surface of the fourth lens > effective diameter of the object side surface of the sixth lens > effective diameter of the sensor side surface of the sixth lens.

[0078] The aperture stop ST can be arranged at a set position. The aperture stop ST can be arranged 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 can be arranged around the sensor side surface of the sensor side lens of the first lens group LG1, that is, around the sensor side surface of the second lens 102. As another example, the aperture stop ST can be arranged 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 can be arranged 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 among the plurality of lenses can be used as the aperture stop. In detail, the object side surface or the sensor side surface of one lens selected from the lenses of the optical systems 1000 and 1001 can be used as the aperture stop for controlling the amount of light.

[0079] Since the embodiment is an optical system applied to a vehicle-mounted camera, an aspherical lens and a spherical lens can be used together, and the first lens closest to the object side can be provided with a glass material. This is because glass materials have the advantages of being scratch-resistant and insensitive to external temperature compared to plastic materials. In order to be placed inside a vehicle or to more effectively prevent scratches caused by foreign matter, a glass lens is used as the first lens, and the object-side surface of the first lens may have a concave shape so as not to contact an 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 an external structure. In order to monitor the driver while driving, take front / rear photos of the vehicle, or detect lanes and detect unexpected objects around the vehicle, the field of view may be greater than 20 degrees and less than 40 degrees, and can be, for example, in the range of 25 degrees to 35 degrees. This horizontal field of view may be a preset angle for an advanced driver assistance system (ADAD). The optical systems 1000 and 1001 according to the embodiments may further include a reflective member (not shown) for changing the optical path. The reflective member may be implemented as a prism that reflects the incident light of the first lens group LG1 toward the lens. Hereinafter, an optical system according to an embodiment will be described in detail.

[0080] <First Embodiment>

[0081] An optical system according to a first embodiment of the present invention will be described. Figure 1 is a side cross-sectional view of an optical system and a camera module having the same according to a first embodiment, Figure 2 Is used to explain the Figure 1 A side cross-sectional view of the relationship between the nth lens and the n-1th lens, Figure 3 It is shown Figure 1 Table of lens characteristics of optical systems, Figure 4It is shown Figure 1 Table of aspheric coefficients of lenses in optical systems, Figure 5 It is shown Figure 1 A table of the thickness of each lens and the spacing between adjacent lenses in an optical system, Figure 6 It shows that according to Figure 1 Table of CRA data for the position of the image sensor in the optical system at room temperature, low temperature, and high temperature, Figures 7 to 9 It is shown Figure 1 The optical system is a graph of the diffraction MTF data at room temperature, low temperature and high temperature, and Figures 10 to 12 Is to show about Figure 1 A graph showing the aberration characteristics of an optical system at room temperature, low temperature, and high temperature.

[0082] refer to 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, 102, 103, 104, 105, 106, and 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 optical filter 500 and be incident on the image sensor 300. The first lens 101 is a lens closest to the object side in the first lens group LG1. The seventh lens 107 is a lens closest to the image sensor 300 in the second lens group LG2 or the lens portion 100. The first lens 101 and the second lens 102 may be the first lens group LG1, and the third to seventh lenses 103, 104, 105, 106, and 107 may be the second lens group LG2.

[0083] The first lens 101 may have a positive (+) or 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. The object-side first surface S1 of the first lens 101 may be concave on the optical axis, and the sensor-side second surface S2 may be convex. The first lens 101 may have a convex meniscus shape toward the sensor. Alternatively, the first surface S1 may have a convex shape relative to the optical axis OA, and the second surface S2 may have a concave shape. Alternatively, the first lens 101 may have a concave shape on both sides relative to the optical axis OA. The first lens 101 may be provided as a spherical lens made of glass. The effective radius r11 of the first surface S1 of the first lens 101 may be greater than the effective radii of the object-side surfaces and the sensor-side surfaces of the second to seventh lenses 102 to 107. Since the first surface S1 is concave and the second surface S2 has a convex shape, incident light is refracted in a direction away from the optical axis OA, and the distance between the first lens 101 and the second lens 102 can be reduced. From the optical axis OA to the end of the effective area, that is, the edge, the first surface S1 of the first lens 101 may be provided without a critical point. The second surface S2 of the first lens 101 may be provided without a critical point.

[0084] The second lens 102 can be arranged between the first lens 101 and the third lens 103. The second lens 102 may have a positive (+) or negative (-) refractive power at the optical axis OA. The second lens 102 may have a positive refractive power. The second lens 102 may include a plastic or glass material. For example, the second lens 102 may be provided as a glass material. The object-side third surface S3 of the second lens 102 relative to the optical axis OA may have a convex shape, and the sensor-side fourth surface S4 may have a concave shape. The second lens 102 may have a meniscus shape convex from the optical axis toward the object side. Alternatively, the second lens 102 may have a convex shape on both sides. Alternatively, the third surface S3 may be concave, and the fourth surface S4 may be convex. Alternatively, the second lens 102 may have a concave shape on both sides. The second lens 102 may be provided as a spherical lens made of glass. The third surface S3 and the fourth surface S4 may be spherical. From the optical axis OA to the end of the effective area, at least one or both of the third surface S3 and the fourth surface S4 may be provided without a critical point.

[0085] 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 object-side or sensor-side surface of the first lens 101, or around the object-side surface of the second lens 102.

[0086] The third lens 103 may have a positive (+) or negative (-) refractive power on the optical axis OA. The third lens 103 may have a positive refractive power. The third lens 103 may include a plastic or glass material. For example, the third lens 103 may be provided with a glass material. The fifth surface S5 on the object side of the third lens 103 based on the optical axis may have a convex shape, and the sixth surface S6 on the sensor side may have a concave shape. The third lens 103 may have a meniscus shape convex from the optical axis to the object side. Alternatively, the third lens 103 may have a meniscus shape convex from the optical axis to the sensor side. Alternatively, the third lens 103 may have a concave shape on both sides from the optical axis. The third lens 103 may be provided as a spherical lens made of glass. The fifth surface S5 and the sixth surface S6 may be spherical. From the optical axis OA to the end of the effective area, at least one or both of the fifth surface S5 and the sixth surface S6 may be provided without a critical point.

[0087] Since the third lens 103 adjacent to the sensor side of the aperture stop ST has a positive refractive power (F3>0), the third lens 103 can 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 can be suppressed. Therefore, the yield calculated by the weight of the optical system can be prevented from being reduced due to the third lens 103, and the production efficiency can be improved. Here, the composite focal length of the third lens to the seventh lens 103-107 arranged on the sensor side of the aperture stop ST can have a positive value, and the TTL within the field of view can be reduced.

[0088] The fourth lens 104 may have a positive (+) or negative (-) refractive power on the optical axis OA. The fourth lens 104 may have a positive refractive power. The fourth lens 104 may include a plastic or glass material. For example, the fourth lens 104 may be provided as a glass material. The object-side seventh surface S7 of the fourth lens 104 on the optical axis may be convex, and the sensor-side eighth surface S8 may be a convex shape. The fourth lens 104 may have a convex shape on both sides. Alternatively, the fourth lens 104 may have 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. Alternatively, the fourth lens 104 may have a meniscus shape convex toward the object side. The fourth lens 104 may be provided as a spherical lens made of glass. The seventh surface S7 and the eighth surface S8 may be spherical surfaces. From the optical axis OA to the end of the effective area, the seventh surface S7 and the eighth surface S8 may be provided without a critical point.

[0089] The fifth lens 105 may have a positive (+) or 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 or glass material. For example, the fifth lens 105 may be provided with a glass material. With respect to the optical axis OA, the object-side ninth surface of the fifth lens 105 may have a concave shape, and the sensor-side tenth surface S10 may have a concave shape. The fifth lens 105 may have a concave shape on both sides on the optical axis OA. In this way, the fifth lens 105 may have a convex meniscus shape toward the object side. In this way, the ninth surface may have a concave shape on the optical axis OA, and the tenth surface S10 may have a convex shape. In this way, the fifth lens 105 may have a convex shape on both sides on the optical axis. The ninth surface and the tenth surface S10 of the fifth lens 105 may be spherical surfaces. From the optical axis OA to the end of the effective area, at least one or both of the ninth surface and the tenth surface S10 may be provided without a critical point.

[0090] The fourth lens 104 and the fifth lens 105 may be cemented and may be defined as a cemented lens 145. The cemented 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. When the composite refractive power of the cemented lens 145 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 to the seventh lens 103-107 is F37, the following conditions in absolute value may be satisfied: F27 <F45<F12。

[0091] The product of the refractive power of the fourth lens 104 of the cemented lens 145 and the refractive power of the fifth lens 105 may be less than 0. The product of the focal length of the fourth lens 104 of the cemented lens 145 and the focal length of the fifth lens 105 may be less than 0. Therefore, the aberration characteristics of the optical system can be improved. If the refractive power of the two lenses of the cemented lens 145 is the same, there is a limit to the improvement of the aberration. The synthetic refractive power of the cemented lens 145 has a negative refractive power, and the third lens 103 arranged on the object side based on the cemented lens 145 and the sixth lens 106 arranged on the sensor side may have a positive refractive power. Therefore, the third lens 103, the cemented lens 145 and the sixth lens 106 may refract some of the incident light in the direction of the optical axis.

[0092] The effective diameter of the fourth lens 104 may be greater than the diagonal length of the image sensor 300. The effective diameter of the fourth lens 104 is an average of the effective diameters of the seventh surface S7 and the eighth surface S8, and may be greater than the diagonal length of the image sensor 300. The effective diameter of the fifth lens 105 may be smaller than the effective diameter of the fourth lens 104 and may have a length within the range of ±110% or ±105% of the diagonal length of the image sensor 300. Preferably, the effective diameter of the fifth lens 105 may be greater than the diagonal length of the image sensor 300, for example, may be 110% or less or 105% or less of the diagonal length of the image sensor 300. The effective diameter of the seventh surface S7 of the fourth lens 104 may be greater than the diagonal length of the image sensor 300, and the effective diameter of the tenth surface S10 of the fifth lens 105 may have a range of 95% to 105% of the diagonal length of the image sensor 300.

[0093] When the fifth lens 105 is a spherical lens and the sixth lens 106 is an aspherical lens, the difference between the effective diameter of the object-side seventh surface S7 of the cemented lens 145 and the effective diameter of the sensor-side tenth surface S10 can be provided to be the largest within the lens portion 100. When the effective diameter of the seventh surface of the fourth lens 104 and the effective diameter of the sensor-side eighth surface S8 are set to CA41 and CA42, the following condition is satisfied: CA41>CA42, and the difference between CA41 and CA42 can be the largest among the effective diameter differences between the object-side surface and the sensor-side surface of each lens. In addition, when the effective diameter of the ninth surface of the fifth lens 105 and the effective diameter of the sensor-side tenth surface S10 are set to CA51 and CA52, the following condition can be satisfied: CA51>CA52. Therefore, light traveling to the aspherical lens can be effectively guided by the fifth lens 105 having a relatively small effective diameter.

[0094] Since the cemented lens 145 is bonded with a spherical glass lens having a different refractive index, and at least one lens arranged on the sensor side relative to the cemented lens 145 is arranged as an aspherical lens, spherical aberration can be compensated in the optical system 1000. In addition, since at least one or two or more lenses arranged on the sensor side are aspherical lenses and have a smaller effective diameter than the cemented lens 145, light traveling to the image sensor 300 through the aspherical lens can be effectively guided. When the refractive index of the fourth lens 104 is n4, the refractive index of the fifth lens 105 is n5, the Abbe number of the fourth lens 104 is v4, and the Abbe number of the fifth lens 105 is v5, the following condition can be satisfied: n5*v5 <n4*v4。

[0095] When the radius of curvature of the seventh surface S7 on the object side of the cemented lens 145 is L4R1, and the radius of curvature of the tenth surface S10 on the sensor side of the cemented lens 145 is L5R2, the following conditions may be satisfied: |L4R1-L5R2|<20 mm, and preferably, |L4R1-L5R2|≤15 mm. The shapes of the object side surface and the sensor side surface of the cemented lens 145 have a meniscus shape convex toward the object side, and by setting the difference in the radius of curvature of the object side surface and the sensor side surface to be smaller, the amount of incident light can be increased, and the emitted light can be guided to the area of ​​the sixth lens 106 having a small effective diameter.

[0096] The sixth lens 106 can have a positive (+) or negative (-) refractive power on the optical axis OA. The sixth lens 106 can have a positive (+) refractive power. The sixth lens 106 can include a plastic or glass material. For example, the sixth lens 106 can be provided as a glass material or a glass molded material. The sixth lens 106 can have an eleventh surface S11 that is convex on the object side with respect to the optical axis OA and a twelfth surface S12 that is concave on the sensor side. The sixth lens 106 can have a meniscus shape that is convex from the optical axis OA toward the object side. Alternatively, the sixth lens 106 can have a meniscus shape that is convex toward the sensor side, or a shape that is convex on both sides. Alternatively, the sixth lens 106 can have a concave shape on both sides. The eleventh surface S11 and the twelfth surface S12 can be aspherical surfaces, and the aspherical coefficients of the eleventh surface S11 and the twelfth surface S12 can be provided as Figure 4 L6S1 and L6S2. The sixth lens 106 is provided with an aspherical glass material so that the glass material with a low refractive index has an aspherical surface, and thereby the number of lenses in the optical system can be reduced. The optical system 1000 may have at least one, for example, 1 to 3 aspherical glass lenses, and preferably 2. From the optical axis OA to the end of the effective area, an eleventh surface S11 of the sixth lens 106 may be provided without a critical point. From the optical axis OA to the end of the effective area, a twelfth surface S12 may be provided without a critical point. Differently, at least one of the object side surface and the sensor side surface of the sixth lens 106 may have at least one critical point from the optical axis to the end of the effective area.

[0097] Since the object side surface and the sensor side of the sixth lens 106 are not provided with critical points, it is impossible to increase the effective diameter of the seventh lens 107. 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 will not be large. When the effective diameter of the eleventh surface S11 on the object side of the sixth lens 106 is CA61 and the effective diameter of the twelfth surface S12 on the sensor side of the sixth lens 106 is CA62, the following condition can be satisfied: CA62 < CA61. When the radius of curvature of the eleventh surface S11 on the object side of the sixth lens 106 is L6R1 and the radius of curvature of the twelfth surface S12 on the sensor side of the sixth lens 106 is L6R2, the following condition can be satisfied: CA61 * L6R1 < CA62 * L6R2. When the refractive index of the sixth lens 106 is n6, the Abbe number is v6, and the refractive index of the first lens 101 is n1, and the Abbe number is v1, the following conditions can be satisfied: n6 < n1, and n1 * v1 < n6 * v6. This means that the central thickness of the sixth lens 106 can be provided to be greater than the central thickness of the seventh lens 107, so as to make the refractive index less than 1.6 and increase the Abbe number to suppress chromatic dispersion.

[0098] The seventh lens 107 may have a positive (+) or negative (-) refractive power on the optical axis OA. The seventh lens 107 may have a negative (-) refractive power. The seventh lens 107 may include a plastic or glass material. For example, the seventh lens 107 may be a glass material or a glass molded material. The thirteenth surface S13 on the object side of the seventh lens 107 on the optical axis may have a convex shape, and the fourteenth surface S14 on the sensor side may have a concave shape. The seventh lens 107 may have a meniscus shape that bulges toward the object side on the optical axis. Alternatively, the thirteenth surface S13 on the optical axis OA may have a concave shape, and the fourteenth surface S14 may have a convex shape. On the contrary, the seventh lens 107 may have a concave shape on both sides. The seventh lens 107 may be made of glass and may have aspherical surfaces on both sides. The thirteenth surface S13 and the fourteenth surface S14 may have aspherical surfaces, and the aspherical coefficients may be provided as Figure 4 L7S1 and L7S2. The seventh lens 107 may be the aspherical lens closest to the image sensor 300. By arranging the aspherical lens closest to the image sensor 300, the degradation of optical performance can be prevented, and the influence on aberration characteristics and resolution can be controlled. Additionally, by arranging the aspherical lens as the lens closest to the image sensor 300, it 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 in the assembly compared to the design during assembly, it may not significantly affect the optical performance.

[0099] In the sixth lens 106, if the Sag value of the object-side surface is Sag61 and the Sag value of the sensor-side surface is Sag62, the following condition can be satisfied: 0 < Sag61 - Sag62 < 0.5 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 seventh lens 107, if the Sag value of the object-side surface is Sag71 and the Sag value of the sensor-side surface is Sag72, the following condition can be satisfied: 0 < |Sag71| - |Sag72| < 0.3 mm. Therefore, the thickness difference between the center and the edge of the seventh lens 107 is not large, and the radius of curvature is not large, and the influence on the optical characteristics can be suppressed. Since the sixth lens 106 and the seventh lens 107 are arranged with aspherical glass materials, they can resist temperature changes caused by heat, can reduce the number of lenses, and can reduce the TTL of the optical system.

[0100] Reference Figure 2 , at least one or both of the thirteenth surface S13 and the fourteenth surface S14 of the seventh lens 107 can have critical points. The thirteenth surface S13 of the seventh lens 107 can 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 can be located at a distance of 58% or less of the effective radius from the optical axis OA, or in the range of 38% to 58%, or in the range of 43% to 53%. The critical point of the thirteenth surface S13 can be located at a distance of 2.5 mm or less from the optical axis OA, for example, in the range of 1.2 mm to 2.5 mm, or in the range of 1.6 mm to 2.3 mm. As another example, the thirteenth surface S13 may not be provided with critical points.

[0101] 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 of 52% or more of the effective radius from the optical axis OA, or in a range of 52% to 72%, or in a range of 57% to 67%. The critical point of the fourteenth surface S14 can be located at a position of 2.1 mm or more of the effective radius from the optical axis OA, for example, in a range of 2.1 mm to 3.4 mm or in a range of 2.5 mm to 3.2 mm. BFL (back focal length) is an 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 any point of 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 line angle θ1 on the fourteenth surface S14 in the first direction X may be 45 degrees or less, for example, in a range of 5 degrees to 45 degrees or in a range of 15 degrees to 25 degrees. Figure 2 , 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., 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 optical axis distance (i.e., edge distance) from the edge of the sixth lens 106 to the edge of the seventh lens 107.

[0102] The center thickness of the cemented lens 145 is CT45, which 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, which 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. When 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 Sga61, the Sag value of the object side surface of the sixth lens 106 is Sga62, the Sag value of the sensor side surface of the seventh lens 107 is Sga71, and the Sag value of the sensor side surface of the seventh lens 107 is Sga72, the following conditions in absolute value are satisfied: Max_Sag52 < Max_Sag41, the following condition is satisfied: Max_Sag61 < Max_Sag52, and the following condition can be satisfied: Max_Sag71 < Max_Sag 72 < Max_Sag62 < Sag61. In this way, by adjusting the lens surfaces from the center to the edges of the fifth to seventh lenses 105 - 107, incident light can be guided to the entire area of the image sensor 300. Here, the Max_Sag value is the maximum distance from a straight line perpendicular to the center of each lens's object side surface or sensor side surface in the optical axis direction to the lens surface, and the Sag value can be negative when it is located on the object side surface rather than the center, and the Sag value can be positive when it is located on the sensor side surface rather than the center.

[0103] Figure 3 is Figure 1 an example of the lens data of the optical system of the embodiment. As Figure 3 shown, it is possible to set the curvature radii of the first lens 101 to the seventh lens 107 on the optical axis OA, 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 diameter (i.e., the clear aperture; CA). When the curvature radius of each lens on the optical axis is expressed as an absolute value, the curvature radius of the fourth surface S4 of the second lens 102 on the optical axis OA can be the largest among the lenses, and the curvature radius of the tenth surface S10 of the fifth lens 105 can be the smallest among the lenses. The difference between the maximum curvature radius and the minimum curvature radius can be 10 times or more, for example, 15 times or more. When the curvature radius of each lens on the optical axis is expressed as an absolute value, the curvature radius of the first lens 101 on the optical axis can be smaller than the curvature radius of the second lens 102 arranged on the sensor side of the aperture stop ST and the curvature radius of the third lens 103 arranged on the object side. Here, the curvature radius is the average value of the absolute values of the curvature radii of the object side surface and the sensor side surface of each lens.

[0104] The radius of curvature of the first lens 101 may be larger than the radius of curvature of the other lenses except the object side lens and the sensor side lens of the aperture stop ST. Here, the object side lens of the aperture stop ST is the second lens 102, the sensor side lens is the third lens 103, and the other lenses are the fourth lens 104 to the seventh lens 107. The radius of curvature is the average value of the absolute values ​​of the radii of curvature of the object side surface and the sensor side surface. 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 sensor side radius of curvature is Rsi, and the absolute value of the average value of the object side surface and the sensor side surface is Ri. The value of (Roi-Rsi) / Ri may be the smallest when i is 7, and the value of (Roi-Rsi) / Ri may be the largest when i is 3. Among them, when i is 6 or 7, the value of (Roi-Rsi) / Ri may be less than 1, for example, 0.6 or less. Therefore, each of the plurality of aspherical lenses may have the curvature radii of the object-side surface and the sensor-side surface such that a difference between average values ​​of the curvature radii of each aspherical lens is smaller than that of each of the spherical lenses.

[0105] The absolute value difference in the radius of curvature of the first surface S1 and the second surface S2 of the first lens 101 may be 100 mm or less, for example, in the range of 30 mm to 100 mm. The absolute value difference in the radius of curvature of the first surface S1 and the second surface S2 of the first lens 101 may be smaller than the difference in the radius of curvature between the object-side surface and the sensor-side surface of the object-side lens 103 of the aperture stop ST, and further, the absolute value difference in the radius of curvature between the first surface S1 and the second surface S2 of the first lens 101 may be smaller than the difference in the radius of curvature between the object-side surface and the sensor-side surface of the lens 104 arranged on the sensor side of the aperture stop ST. Since the first lens 101 is provided as a spherical surface, the center thickness on the optical axis can be increased, the difference in the radius of curvature of the object-side surface and the sensor-side surface can not be increased, and assemblability can be improved.

[0106] The curvature radius of the sixth lens 106 on the optical axis can be smaller than the curvature radius of the first lens 101. Since the sixth lens 106 is an aspherical surface and has a smaller curvature radius than the first lens 101, the entire area can be provided with uniform light distribution. The curvature radius of the seventh lens 107 on the optical axis can be smaller than the curvature radius of the first lens 101. Since the seventh lens 107 is an aspherical surface and has a smaller curvature radius than the first lens 101, the entire area can be provided with uniform light distribution. Since the difference in curvature radius between the sixth lens 106 and the seventh lens 107 on the optical axis is provided to be 20 mm or less, for example, 15 mm or less, the incident light can be guided to the entire area of ​​the image sensor 300 through the two aspherical lenses. In addition, the curvature radius of the seventh lens 107 on the optical axis can be greater than the curvature radius of the sixth lens 106 made of glass. Therefore, the seventh lens 107 can guide the light incident through the first lens 101 to the sixth lens 106 to the entire area of ​​the image sensor 300.

[0107] The curvature radii of the first surface S1 and the second surface S2 of the first lens 101 are defined as L1R1 and L1R2, the curvature radii of the thirteenth surface S13 and the fourteenth surface S14 of the seventh lens 107 are defined as L7R1 and L7R2, and the curvature radius of each lens surface of the second to sixth lenses 102-106 can be defined as L2R1, L2R2, L3R1, L3R2, L4R1, L4R2 (L5R1), L5R2, L6R1 and L6R2.

[0108] Condition 1: 0<|L1R1 / L1R2|<0.6

[0109] Condition 2: 0<|L2R1 / L2R2|<0.5

[0110] Condition 3: 0 <L3R1 / L3R2<0.5

[0111] Condition 4: 0 <L4R1 / L4R2<0.5

[0112] Condition 5: 2 <L5R1 / L5R2<10

[0113] Condition 6: 0 <L6R1 / L6R2<1.2

[0114] Condition 7: 1 <L7R1 / L7R2<2.2

[0115] Condition 8: 5 mm≤L6R2-L6R1≤25 mm

[0116] Condition 9: 1 mm≤L7R1-L7R2≤25 mm

[0117] When the center thicknesses of the first to seventh lenses 101 to 107 are defined as CT1-CT7 and the edge thicknesses of the first to seventh lenses 101 to 107 are defined as ET1-ET7, the sum of the center thicknesses of the first to seventh lenses 101 to 107 is defined as ΣCT, and the sum of the edge thicknesses of the first to seventh lenses 101-107 can be defined as ΣET.

[0118] In explaining the thickness of the lens, the center thickness CT1 of the first lens 101 may be greater than the center thicknesses CT2-CT7 of the second lens 102 to the seventh lens 107, and may have the maximum thickness in the lens portion 100. The center thickness CT7 of the seventh lens 107 may be less than the center thicknesses CT1-CT6 of the first lens 101 to the sixth lens 106, and may have the minimum thickness in the lens portion 100. The aspherical lens includes the sixth lens 106 and the seventh lens 107, and may satisfy the following conditions: CT7 <CT4<CT6<CT1。

[0119] The following conditions can be met.

[0120] Condition 1: 0.6 <CT1 / ET1<1.2

[0121] Condition 2: 1 <CT2 / ET2<2

[0122] Condition 3: 1.2 <CT3 / ET3<2.5

[0123] Condition 4: 1.2 <CT4 / ET4<2.4

[0124] Condition 5: 0 <CT5 / ET5<1

[0125] Condition 6: 0.6 <CT6 / ET6<2

[0126] Condition 7: 0.4 <CT7 / ET7<1.2

[0127] Condition 8: 0.8<∑CT / ∑ET<1.2

[0128] In this way, the difference between the center thickness and the edge thickness of each lens can be set to be greater than 0.6 mm and less than 3 mm. By arranging two aspherical lenses adjacent to the image sensor 300 so that the difference between the center thickness and the edge thickness of each lens is not large, light can be effectively guided without increasing the difference between the center thickness and the edge thickness of each lens. In addition, the difference between the maximum center thickness and the minimum center thickness in the lens can be 7 mm or more, for example, in the range of 7 mm to 10 mm or 7 mm to 9 mm. That is, even if the center thickness of the final aspherical lens is provided very thin, the optical performance will not be degraded, and the thickness of the camera module can be provided slim.

[0129] When TTL, the optical axis distance from the center of the object-side surface of the first lens 101 to the surface of the image sensor 300 may satisfy the following condition.

[0130] Condition 1: 0.15 <CT1 / TTL<0.5

[0131] Preferably, condition 1 may satisfy: 0.20≤CT1 / TTL≤0.30.

[0132] Condition 2: 0 <CT2 / TTL<0.1

[0133] Condition 3: 0 <CT3 / TTL<0.1

[0134] Condition 4: 0.1 <CT4 / TTL<0.25

[0135] Condition 5: 0 <CT5 / TTL<0.1

[0136] Condition 6: 0 <CT6 / TTL<0.2

[0137] Condition 7: 0 <CT7 / TTL<0.1

[0138] The ratio of CT1 / TTL of Condition 1 may be greater than the values ​​of Conditions 2 to 7. The relationship between the cemented lens 145 and the first and sixth lenses 101 and 106 may satisfy the following conditions.

[0139] Condition 1: 1.2 <CT1 / CT45<1.6

[0140] Condition 2: 1.3 <CT1 / CT6<1.8

[0141] Condition 3: 0.3 <CT1 / ∑CT<0.5

[0142] Condition 4: 0.15 <CT45 / ∑CT<0.35

[0143] Condition 5: 0.1 <CT6 / ∑CT<0.33

[0144] By setting the center thickness and edge thickness of the first to seventh lenses 101 to 107 to these conditions, light can be guided to an optimal path according to the refractive index, Abbe number, and curvature radius of each lens in the optical system 1000 .

[0145] The center distances between the first lens 101 and the seventh lens 107 are defined as CG1 - 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 distance between lenses is described as not including the spacing between two lenses in a cemented lens. The center distance CG2 between the second lens 102 and the third lens 103 is the largest, and the center distance between the first lens 101 and the second lens 102 or / and the center distance between the third lens 103 and the fourth lens 104 is the smallest. Additionally, the center distance between the aspherical lenses is CG6 and can satisfy: 1.2 < CG2 / CG6 < 2. The center distance CG6 between the sixth lens 106 and the seventh lens 107 can be less than CG1 and is the second largest within the lens part 100. The center thickness of each lens and the center distance between adjacent lenses can satisfy the following conditions.

[0146] Condition 1: 20 < CT1 / CG1 < 60

[0147] Condition 2: 2 < CT1 / CG2 < 5

[0148] Condition 3: 1 < CT6 / CG6 < 5

[0149] Condition 4: 5 < CT45 < CG5 < 10

[0150] Condition 5: 0.1 < CG2 / ∑CG < 0.6

[0151] By making the maximum center distance between lenses greater than twice the maximum center thickness, for example, in the range of 2.5 to 4 times, a camera module can be provided that applies an aspherical lens to the output side of the optical system without increasing the center thickness compared to the center distance of each lens. 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, not including 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 2 and the largest when i is 1.

[0152] Regarding the effective diameter, the lens having the largest effective diameter can be the first lens 101 closest to the object. The first lens 101 having the largest effective diameter can be a spherical lens. The lens having the smallest effective diameter can be the lens closest to the image sensor 300, for example, can be the seventh lens 107. The effective diameters of the first to seventh lenses 101 to 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 and fourteenth surfaces S13 and 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 to sixth lenses can be defined as CA21, CA22, CA31, CA32, CA41, CA42, CA51, CA52, CA61, and CA62.

[0153] The effective diameter can satisfy the following conditions.

[0154] Condition 1: CA22 <CA12

[0155] Condition 2: CA71 <CA72

[0156] Condition 3: CA31 <CA22

[0157] Condition 4: CA61 <CA51<CA41

[0158] If the refractive index is explained, the refractive index of the first lens 101 is the largest among the lenses and may be 1.75 or greater, for example, 1.85 or greater. The refractive index of the fourth lens 104 is the smallest among the lenses. The difference between the maximum refractive index and the minimum refractive index may be 0.25 or greater, for example, 0.30 or greater. By adjusting the refractive index of the spherical lens and the aspherical lens, the incident efficiency can be increased, and the incident light can be guided to the image sensor 300. If the Abbe number is explained, the Abbe number of the sixth lens 106 is the largest among the lenses and may be 60 or greater. The Abbe number of the seventh lens 107 is the smallest among the lenses. The difference between the maximum refractive index and the minimum Abbe number may be 30 or greater. The Abbe number of the third lens 103 and the fourth lens 104 adjacent to the aperture stop ST is made greater than the Abbe number of the second lens 102 and the fifth lens 105, and the Abbe number of the seventh aspherical lens 107 closest to the image sensor 300 is minimized, thereby controlling the dispersion of light traveling between lenses made of glass and increasing the dispersion between the spherical lens and the aspherical lens to guide it to the image sensor 300.

[0159] If the average effective diameter of the spherical lens is GL_CA_Aver and the average effective diameter of the aspherical lens is GM_CA_Aver, the following condition can be satisfied: GM_CA_Aver < GL_CA_Aver. If the average center thickness of the spherical lens is GL_CT_Aver and the average center thickness of the aspherical lens is GM_CT_Aver, the following condition can be satisfied: GM_CT_Aver < GL_CT_Aver. The average refractive index of the spherical lens is GL_nd_Aver and the average refractive index of the aspherical lens is GM_nd_Aver, such that the following condition can be satisfied: GM_nd_Aver < GL_nd_Aver. The average Abbe number of the spherical lens is GL_Ad_Aver and the average Abbe number of the aspherical lens is GM_Ad_Aver, such that the following condition can be satisfied: GL_Ad_Aver < GM_Ad_Aver.

[0160] The focal lengths F1, F5, and F7 of the first lens 101, the fifth lens 105, and the seventh lens 107 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 lenses arranged adjacent to each other, can satisfy the following conditions.

[0161] Condition 1: The refractive index of the lens with positive refractive power < the refractive index of the lens with negative refractive power

[0162] Condition 2: The dispersion of the lens with positive refractive power > the dispersion of the lens with negative refractive power

[0163] Here, since the sixth lens 106 has positive refractive power and the seventh lens 107 has negative refractive power, according to Conditions 1 and 2, the refractive index of the sixth lens 106 is less than the refractive index of the seventh lens 107, and the dispersion value of the sixth lens 106 is greater than the dispersion value of the seventh lens 107. The chromatic aberration that appears in the fifth lens can be corrected by the aspherical lens. Additionally, by satisfying that the refractive index difference between the sixth lens 106 and the seventh lens 107 arranged sequentially is 0.25 or greater and 0.5 or less and the Abbe number difference is 30 or greater and 70 or less, the chromatic aberration that appears in the spherical lens can be compensated by the aspherical lens.

[0164] The optical system 1000 generates chromatic aberration, and corrects the chromatic aberration by using a cemented lens 145 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 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 and the fifth lens 105 and 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 is 0.01 or more and 0.25 or less, and the Abbe number difference is 20 or more and 50 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 then the values ​​are compared. In addition, by arranging a glass lens having a relatively high Abbe number on the object side of the aspherical seventh lens 107 , it is possible to reduce dispersion by the glass lens and increase dispersion by the aspherical lens.

[0165] When the focal length is expressed as an absolute value, the focal length of the seventh lens 107 is the largest among the lenses and may be 45 or more. The focal length of the fifth lens 105 is the smallest among the lenses. The difference between the maximum focal length and the minimum focal length may be 35 or more. By maximizing the focal length of the lens closest to the sensor and providing the smallest focal length of the fifth lens 105, 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 at the periphery of the field of view.

[0166] The sensor side surface of the seventh lens 107 has a critical point. The critical point is a point where the trend of the Sag value changes. That is, a point where the Sag value increases and decreases, or a point where the Sag value decreases and then increases. It can be seen that the sensor side surface of the seventh lens 107 has a critical point between a point 1.8 mm apart and a point 2.8 mm apart in a direction perpendicular to the optical axis. For example, the sensor side surface of the seventh lens 107 increases the Sag value from the optical axis to a point of 2.0 mm ± 0.4 mm in a direction perpendicular to the optical axis, and then decreases toward the edge from the point of 2.0 mm ± 0.4 mm. If the critical point exists on the sensor side surface of the seventh lens 107, that is, on the sensor side surface of the last lens, that is, on the lens surface closest to the sensor, TTL can be reduced, thereby facilitating miniaturization and lightness of the optical system.

[0167] like Figure 4As shown, among the lenses of the lens portion 100 in the embodiment, the lens surfaces of the sixth lens 106 and the seventh lens 107 may include aspherical surfaces having 30th-order aspherical coefficients. For example, the sixth lens 106 and the seventh lens 107 may include lens surfaces having 30th-order aspherical coefficients. As described above, since the aspherical surface having a 30th-order aspherical coefficient (a value other than "0") can significantly change the aspherical shape of the periphery, the optical performance of the periphery of the field of view (FOV) can be well corrected. As Figure 5 As shown, the thicknesses T1-T7 of the first lens to the seventh lens 101, 102, 103, 104, 105, 106, 107 and the distances G1-G6 between two adjacent lenses can be set. As Figure 5 As shown, the thicknesses of each of the lenses T1-T7 in the Y-axis direction can be expressed at intervals of 0.1 mm or 0.2 mm or more, and the intervals between each of the lenses G1-G6 can be expressed at intervals of 0.1 mm or 0.2 mm or more.

[0168] The central thickness CT45 of the cemented lens 145 may be greater than the edge thickness ET45. The central thickness CT45 of the cemented lens 145 is the distance in the optical axis direction from the center of the seventh surface S7 on the object side of the fourth lens 104 to the center of the tenth surface S10 of the fifth lens 105, and the edge thickness ET45 is the distance in the optical axis direction from the end of the effective area of the seventh surface S7 to the tenth surface S10. 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 1 times or more the minimum thickness, for example, in the range of 1 to 1.5 times. The cemented lens 145 may satisfy the following condition: 0 mm < CT45 - ET45 < 2 mm. 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 1.5 times or less 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 1.05 times or more the minimum thickness, for example, in the range of 1.05 to 1.5 times.

[0169] As Figure 6 As shown, in Figure 1 the optical system and the camera module, the chief ray angle (CRA) may be 10 degrees or more, for example, in the range of 10 to 35 degrees or in the range of 10 to 25 degrees. As Fig. 20 As shown, the curve diagram showing the relative illuminance according to the image height in the optical system according to the embodiment shows that from the center to the diagonal end of the image sensor, the relative illuminance is 70% or more, for example, 75% or more. That is, the relative illuminance (zoom positions 1, 2, 3) is almost the same up to 4.4 mm from the optical axis according to the difference in temperature.

[0170] Figures 7 to 9 It is shown Figure 1 The graph is a graph of the diffraction MTF (Modulation Transfer Function) at room temperature, low temperature, and high temperature in the optical system of FIG. , and is a graph showing the modulation according to the spatial frequency. Figures 7 to 9 As shown in , 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 can be less than 10%, that is, 7% or less.

[0171] Figures 10 to 12 It is shown Figure 1 The aberration characteristics of the optical system at room temperature, low temperature and high temperature. Figures 10 to 12 In the aberration graph of , 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 for spherical aberration is a graph for light of wavelength bands of about 435 nm, about 486 nm, about 546 nm, about 587 nm, and about 656 nm, and the graph for astigmatism and distortion is a graph for light of wavelength band of about 546 nm. 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 a measurement value close to the Y-axis in almost all areas. That is, the optical system 1000 according to the embodiment has improved resolution not only in the central part of the FOV but also in the peripheral part and can have good optical performance. Here, the low temperature is -20 degrees or lower, for example, in the range of -20 to -40 degrees, the room temperature is in the range of 22 degrees ± 5 degrees or in the range of 18 to 27 degrees, and the high temperature can be in the range of 85 degrees or higher, for example, in the range of 85 to 105 degrees. Therefore, it can be seen that from Figures 10 to 12 The low temperature to high temperature brightness ratio (modulation) is reduced by less than 10%, for example, 5% or less, or is barely changed.

[0172] Table 1 compares the changes in optical characteristics such as EFL, BFL, F number, TTL, and diagonal FOV of the optical system according to the first embodiment at room temperature, low temperature, and high temperature, and it can be seen that based on room temperature, the rate of change of the optical characteristics at low temperature is 5% or less, for example, 3% or less; and based on room temperature, the rate of change of the optical characteristics at low temperature is 5% or less, for example, 3% or less.

[0173]

Table 1

[0174]

[0175] Therefore, as shown in Table 1, it can be seen that the change in optical characteristics according to the temperature change from low temperature to high temperature, for example, 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, within the range of 0 to 5%. This means that even if at least one or two or more aspherical lenses are used, it is possible to design to temperature compensate the aspherical lenses, thereby preventing the reliability of optical characteristics from being reduced. In addition, it can be seen that even if the temperature changes from room temperature to low temperature or high temperature, EFL, TTL, BFL, F number (F#) and diagonal FOV hardly change. The optical system of the above-disclosed embodiment can effectively control aberration characteristics such as chromatic aberration and distortion aberration, and has good optical performance not only at the center part of the field of view but also at the peripheral part. <Second embodiment>

[0176] Fig.13 is a side cross-sectional view of an optical system and a camera module having the same according to a second embodiment, Fig.14 It is shown Fig.13 Table of lens characteristics of optical systems, Fig.15 It is shown Fig.13 Table of aspheric coefficients of lenses in an optical system, Fig.16 It is shown Fig.13 A table showing the thickness of each lens and the spacing between adjacent lenses in an optical system. Fig.17 It is shown Fig.13 Table of CRA data at room temperature, low temperature, and high temperature according to the position of the image sensor in the optical system. Fig.18 About Fig.13 A graph of the diffraction MTF data of an optical system at room temperature, and Fig.18 Is to show about Fig.13 A graph of data of aberration characteristics of an optical system at room temperature.

[0177] refer to Fig.13 and Fig.14, the optical system 1001 according to the second embodiment includes a lens part 100A, and the lens part 100A may include first to seventh lenses 111 to 117. The first to seventh lenses 111 to 117 may be sequentially arranged along the optical axis OA. Light corresponding to information about an object may pass through the first to seventh lenses 111 to 117 and the optical filter 500 and be incident on the image sensor 300. The first lens 111 is a lens closest to the object side in the first lens group LG1. The seventh lens 117 is a lens closest to the image sensor 117 in the second lens group LG2 or the lens part 100A. The first lens 111 and the second lens 112 may be the first lens group LG1, and the third to seventh lenses 113, 114, 115, 116, and 117 may be the second lens group LG2.

[0178] The first lens 111 may have a positive (+) or negative (-) refractive power on the optical axis OA. The first lens 111 may have a negative (-) refractive power. The first lens 111 may include a plastic material or a glass material, and may be, for example, a non-molded glass material. The first lens 111 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 1001. The object side first surface S1 of the first lens 111 based on the optical axis may have a concave shape, and the sensor side second surface S2 may have a convex shape. The first lens 111 may have a convex meniscus shape toward the sensor side. Differently, the first surface S1 may have a convex shape, and the second surface S2 may have a concave shape on the optical axis OA. Differently, the first lens 111 may have a concave shape on both sides. The first lens 111 is made of a spherical glass material, has a high transmittance and refractive index, and is provided with a thick thickness, thereby preventing degradation of the optical characteristics of the incident side lens and protecting the surface.

[0179] In the optical system 1001, there may be one or more, for example, one to three, lenses made of a glass material having an aspherical surface. The effective radius r11 of the first surface S1 of the first lens 111 may be greater than the effective radii of the object-side surface and the sensor-side surface of the seventh lens 117. Because the first surface S1 is concave and the second surface S2 is convex, the incident light may be refracted in a direction away from the optical axis OA. Therefore, the distance between the first lens 111 and the second lens 112 may be reduced, thereby suppressing an increase in the effective diameter of the second lens 112. From the optical axis OA to the end of the effective area, that is, the edge, the first surface S1 of the first lens 111 may be provided without a critical point. The second surface S2 of the first lens 111 may not be provided with a critical point.

[0180] The second lens 112 may be arranged between the first lens 111 and the third lens 113. The second lens 112 may have a positive (+) or negative (-) refractive power on the optical axis OA. The second lens 112 may have a positive (+) refractive power. The second lens 112 may include a plastic or glass material. For example, the second lens 112 may be provided as a glass material. The third surface S3 of the second lens 112 relative to the optical axis OA may be convex, and the fourth surface S4 may have a concave shape. The second lens 112 may have a meniscus shape convex toward the object side on the optical axis. Alternatively, the third surface S3 may be convex, and the fourth surface S4 may have a convex shape. On the contrary, the second lens 112 may have a concave shape on both sides or a convex shape toward the sensor side. The second lens 112 may be provided as a spherical lens made of glass. The third surface S3 and the fourth surface S4 may be spherical. From the optical axis OA to the end of the effective area, at least one or both of the third surface S3 and the fourth surface S4 may be provided without a critical point.

[0181] The aperture stop ST may be arranged around the sensor-side surface of the second lens 112. Conversely, the aperture stop ST may be arranged around the object-side or sensor-side surface of the first lens 111, or around the object-side surface of the second lens 112.

[0182] The third lens 113 may have a positive (+) or negative (-) refractive power on the optical axis OA. The third lens 113 may have a positive (+) refractive power. The third lens 113 may include a plastic or glass material. For example, the third lens 113 may be provided as a glass material. The object-side fifth surface S5 of the third lens 113 may have a convex shape on the optical axis, and the sensor-side sixth surface S6 may have a convex shape. The third lens 113 may have a convex shape on both sides of the optical axis. Alternatively, the third lens 113 may have a meniscus shape convex toward the object side. Alternatively, the third lens 113 may have a meniscus shape convex toward the sensor side. Alternatively, the third lens 113 may have a concave shape on both sides on the optical axis. The third lens 113 may be provided as a spherical lens made of glass. The fifth surface S5 and the sixth surface S6 may be spherical. From the optical axis OA to the end of the effective area, at least one or both of the fifth surface S5 and the sixth surface S6 may be provided without a critical point.

[0183] Since the third lens 113 adjacent to the sensor side of the aperture stop ST has a positive refractive power (F3>0), the third lens 113 can refract the incident light in the direction of the optical axis, and the increase in the effective diameter of the sensor side or rear side lens of the third lens 113 can be suppressed. Therefore, it is possible to prevent the yield calculated by the weight of the optical system from being reduced due to the third lens 113, and the production efficiency can be improved. Here, the composite focal length of the third lens to the seventh lens 113-117 arranged on the sensor side of the aperture stop ST can have a positive value, and the TTL can be reduced within the FOV range.

[0184] The fourth lens 114 may have a positive (+) or negative (-) refractive power on the optical axis OA. The fourth lens 114 may have a positive (+) refractive power. The fourth lens 114 may include a plastic or glass material. For example, the fourth lens 114 may be provided as a glass material. The object-side seventh surface S7 of the fourth lens 114 may have a convex shape on the optical axis, and the sensor-side eighth surface S8 may have a convex shape. The fourth lens 114 may have a convex shape on both sides. Alternatively, the seventh surface S7 may have a concave shape, and the eighth surface S8 may have a concave shape on the optical axis OA. Alternatively, the fourth lens 114 may have a protruding meniscus shape on the object side or the sensor side. The fourth lens 114 may be provided as a spherical lens made of glass. The seventh surface S7 and the eighth surface S8 may be spherical surfaces. From the optical axis OA to the end of the effective area, the seventh surface S7 and the eighth surface S8 may be provided without a critical point.

[0185] The fifth lens 115 can have a positive (+) or negative (-) refractive power on the optical axis OA. The fifth lens 115 can have a negative (-) refractive power. The fifth lens 115 can include a plastic or glass material. For example, the fifth lens 115 can be provided with a glass material. Based on the optical axis OA, the object-side ninth surface of the fifth lens 115 can have a concave shape, and the sensor-side tenth surface S10 can have a concave shape. The fifth lens 115 can have a concave shape on both sides on the optical axis OA. Alternatively, the ninth surface can have a convex shape on the optical axis OA, and the tenth surface S10 can have a concave shape. Alternatively, the ninth surface can have a concave shape on the optical axis OA, and the tenth surface S10 can have a convex shape. The ninth surface and the tenth surface S10 can be spherical surfaces. From the optical axis OA to the end of the effective area, at least one or both of the ninth surface and the tenth surface S10 can be provided without a critical point.

[0186] The fourth lens 114 and the fifth lens 115 may be cemented and may be defined as a cemented lens 145A. The cemented surface between the fourth lens 114 and the fifth lens 115 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 115. When the distance between the fourth lens 114 and the fifth lens 115 is G4, G4 may be less than 0.01 mm. The distance G4 between the fourth lens 114 and the fifth lens 115 from the optical axis OA to the end of the effective area may be less than 0.01 mm. 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. If 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 following conditions in absolute value may be satisfied: F37 <F12<F45。

[0187] The product of the refractive power of the fourth lens 114 on the object side of the cemented lens 145A and the refractive power of the fifth lens 115 on the sensor side can be less than 0. The product of the focal length of the fourth lens 114 on the object side of the cemented lens 145A and the focal length of the fifth lens 115 on the sensor side 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 145A are equally negative or positive, there is a limit to the improvement of the aberration. The composite refractive power of the cemented lens 145A has a positive refractive power, and the third lens 113 arranged on the object side and the sixth lens 116 arranged on the sensor side relative to the cemented lens (145A) can have a positive refractive power. Therefore, the third lens 113, the cemented lens 145A, and the sixth lens 116 can refract part of the incident light in the direction of the optical axis.

[0188] The effective diameter of the fourth lens 114 may be larger than the diagonal length of the image sensor 300. The effective diameter of the fourth lens 114 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 fifth lens 115 may be smaller than the effective diameter of the fourth lens 114, and may have a length within ±110% or ±105% of the diagonal length of the image sensor 300. The effective diameter of the seventh surface S7 of the fourth lens 114 may be larger than the diagonal length of the image sensor 300, and 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. When the fifth lens 115 is a spherical lens and the sixth lens 116 and the seventh lens 117 are aspherical lenses, the difference in the effective diameter between the object-side ninth surface and the sensor-side tenth surface S10 of the fifth lens 115 may be large. For example, when the effective diameters of the ninth surface and the tenth surface S10 on the sensor side of the fifth lens 115 are CA51 and CA52, respectively, the following condition may be satisfied: CA52 < (2*ImgH) < CA51. Here, 2*ImgH is the diagonal length of the image sensor 300. When the effective diameter of the object-side surface of the cemented lens 145A is CA41 and the effective diameter of the sensor-side surface is CA52, the following condition may be satisfied: 2mm < (CA41 - CA51). The effective diameter of the cemented lens 145A may satisfy the following condition: 1.1 < CA41 / CA52 < 1.5. The difference between the effective diameter of the object-side surface and the effective diameter of the sensor-side surface of the cemented lens 145A may be the largest within the lens portion. Therefore, by maximizing the difference in the effective diameter between the object-side surface and the sensor-side surface of the cemented lens 145A, the light traveling through the aspherical lens with a relatively small effective diameter can be effectively guided.

[0189] Since the cemented lens 145A is joined with a glass lens having a different refractive index and has a spherical refracting surface, and at least one lens positioned on the sensor side with respect to the cemented lens 145A is positioned as an aspherical lens, spherical aberration occurring between the lenses can be compensated. In addition, since at least one of the lenses positioned on the sensor side with respect to the cemented lens 145A is an aspherical lens and is positioned with a relatively small effective diameter, the light traveling through the aspherical lens to the image sensor 300 can be effectively guided. Since the position of the cemented lens 145A is between the spherical lens and the aspherical lens, chromatic aberration correction may be more effective.

[0190] The sixth lens 116 may have a positive (+) or negative (-) refractive power on the optical axis OA. The sixth lens 116 may have a positive (+) refractive power. The sixth lens 116 may include a plastic or glass material. For example, the sixth lens 116 may be provided as a glass material. With respect to the optical axis OA, the object-side eleventh surface S11 of the sixth lens 116 may be convex, and the sensor-side twelfth surface S12 may be concave. The sixth lens 116 may have a meniscus shape that is convex toward the object side on the optical axis OA. Alternatively, the sixth lens 116 may have a meniscus shape that is convex toward the sensor side, or have a convex shape on both sides. Alternatively, the sixth lens 116 may have a concave shape on both sides. The sixth lens 116 may be made of glass and may have aspherical surfaces on both sides. The eleventh surface S11 and the twelfth surface S12 may have aspherical surfaces, and the aspherical coefficients may be provided as Fig.15 S1 and S2 of L6 in. Because the sixth lens 116 is made of aspherical glass, the refraction efficiency of light can be improved, and the thickness can be increased to improve the assembly problem caused by the aspherical lens. In addition, the sixth lens 116 made of glass with a thicker thickness can be thermally compensated according to temperature changes, thereby preventing the degradation of optical characteristics. Because the sixth lens 116 is arranged between the spherical lens and the aspherical lens, the degradation of optical performance can be prevented, and the influence on aberration characteristics and resolution can be controlled. From the optical axis OA to the end of the effective area, in the absence of a critical point, the eleventh surface S11 of the sixth lens 116 can be provided. From the optical axis OA to the end of the effective area, in the absence of a critical point, the twelfth surface S12 can be provided.

[0191] The seventh lens 117 may have a positive (+) or negative (-) refractive power on the optical axis OA. The seventh lens 117 may have a negative (-) refractive power. The above-mentioned seventh lens 117 may include a plastic or glass material. For example, the seventh lens 117 may be a glass material or a glass molded material. The object-side thirteenth surface S13 of the seventh lens 117 on the optical axis may have a convex shape, and the sensor-side fourteenth surface S14 may have a concave shape. The seventh lens 117 may have a meniscus shape that is convex on the object side on the optical axis. On the contrary, the thirteenth surface S13 on the optical axis OA may have a concave shape, and the fourteenth surface S14 may have a convex shape. On the contrary, the seventh lens 117 may have a concave shape on both sides. The seventh lens 117 may be made of glass, and may have aspherical surfaces on both sides. The thirteenth surface S13 and the fourteenth surface S14 have aspherical surfaces, and the aspherical coefficients may be provided as Fig.15S1 and S2 of L7. The seventh lens 117 can be an aspherical lens closest to the image sensor 300. By arranging the aspherical lenses as the two lenses closest to the image sensor 300, it is possible to prevent degradation of optical performance, improve aberration characteristics, and control the impact on resolution. In addition, by arranging the aspherical lenses as two lenses adjacent to the image sensor 300, it is possible to be insensitive to assembly tolerances compared to spherical lenses. In other words, insensitivity to assembly tolerances means that even if the assembly is assembled with slight differences compared to the design, the optical performance may not be significantly affected.

[0192] At least one or both of the thirteenth surface S13 and the fourteenth surface S14 of the seventh lens 117 can have a critical point. The thirteenth surface S13 of the seventh lens 117 can 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 can be located at 57% or less of the effective radius from the optical axis OA, or in the range of 37% to 57%, or in the range of 42% to 52%. The critical point of the thirteenth surface S13 can be located at a position less than or equal to 2.4 mm from the optical axis OA, for example, in the range of 2.0 mm ± 0.4 mm. As another example, the thirteenth surface S13 can be provided with no critical point. The fourteenth surface S14 of the seventh lens 117 can 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 can be located at a position 53% or more of the effective radius from the optical axis OA, or in the range of 53% to 73%, or in the range of 58% to 68%. The critical point of the fourteenth surface S14 can be located at a position greater than or equal to 2.4 mm from the optical axis OA, for example, within a range of 2.8 mm ± 0.4 mm. Because the critical point of the fourteenth surface S14 is arranged closer to the edge than the critical point of the thirteenth surface S13, the fourteenth surface S14 can refract light incident through the thirteenth surface S13 to the edge of the image sensor 300.

[0193] In the sixth lens 116, if the Sag value of the object-side surface is Sag61 and the Sag value of the sensor-side surface is Sag62, the following condition can be satisfied: 0 < Sag61 - Sag62 < 0.3 mm. Therefore, the thickness difference between the center and the edge of the sixth lens 116 is small, and the influence on the optical characteristics can be suppressed. In the seventh lens 117, if the Sag value of the object-side surface is Sag71 and the Sag value of the sensor-side surface is Sag72, the following condition can be satisfied: 0 < |Sag71| - |Sag72| < 0.3 mm. Therefore, since the thickness difference between the center and the edge of the seventh lens 117 is small and the radius of curvature is small, the influence on the optical characteristics can be suppressed. Since the sixth lens 116 and the seventh lens 117 are arranged with aspherical glass materials, they can resist temperature changes caused by heat, can reduce the number of lenses, and can reduce the TTL of the optical system.

[0194] Fig.14 Yes Fig.13 An example of the lens data of the optical system of the embodiment. As Fig.14As shown in , the radius of curvature on the optical axis OA of the first to seventh lenses 111 to 117, the center thickness CT of the lens, the center distance CG between adjacent lenses, the refractive index at the d-line, the Abbe number, and the size of the effective diameter (i.e., clear aperture; CA) can be set. When the radius of curvature of each lens on the optical axis is expressed as an absolute value, the radius of curvature of the sixth surface S6 of the third lens 113 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 115 can be the smallest among the lenses. The difference between the maximum radius of curvature and the minimum radius of curvature can be 15 times or more, for example, 20 times or more. In addition, when the first to third lenses 111, 112, 113 are the first group and the fourth to seventh lenses 114, 115, 116, 117 are the second group, the radius of curvature of each lens of the second group can be smaller than the radius of curvature of each lens of the first group. In addition, the difference between the absolute value of the radius of curvature of the object side surface and the sensor side surface of each lens of the second group can be smaller than the difference between the absolute value of the radius of curvature of the object side surface and the sensor side surface of each lens of the first group. Therefore, the lens of the first group can transmit the incident light to the second group without loss, and the lens of the second group can stably guide the incident light passing through the first group to the image sensor 300. That is, the absolute value of the radius of curvature of the first lens 111 as a spherical lens can be greater than the absolute value of the radius of curvature of the fourth to sixth lenses 114, 115 and 116 as spherical lenses. The absolute value of the radius of curvature of the first to third lenses 111, 112 and 113 as spherical lenses can be greater than the absolute value of the radius of curvature of the sixth lens 116 and the seventh lens 117 as aspherical lenses. Therefore, the aspherical lens can be used to refract light uniformly through the entire area of ​​the image sensor 300. In addition, the curvature radius of the sixth lens 116 and the seventh lens 117 can be reduced, thereby reducing the Sag value from the center to the edge of each lens surface, improving assemblability, improving aberration characteristics through aspherical lenses, and reducing the number of lenses.

[0195] The absolute value of the radius of curvature of the first lens 111 on the optical axis may be smaller than the absolute value of the radius of curvature of the second lens 112 arranged on the sensor side of the aperture stop ST, and smaller than the radius of curvature of the third lens 113 arranged on the object side. Here, the radius of curvature is the average value of the absolute values ​​of the radii of curvature of the object-side surface and the sensor-side surface of each lens. Since the first lens 111 is a spherical lens, even if the radius of curvature of the first lens 111 is smaller than the radii of curvature of the second lens 112 and the third lens 113, assemblability is not affected.

[0196] In absolute value, an average value of the radii of curvature of the first surface S1 and the second surface S2 of the first lens 111 may be 25 mm or more, for example, in the range of 25 mm to 60 mm or in the range of 25 mm to 35 mm. In absolute value, a radius of curvature of each of the first surface S1 and the second surface S2 of the first lens 111 may be 10 mm or more, for example, in the range of 10 mm to 70 mm. In absolute value, a difference between the radii of curvature of the first surface S1 and the second surface S2 of the first lens 111 may be 15 mm or more, for example, in the range of 15 mm to 40 mm. In absolute value, the difference in curvature radius between the first surface S1 and the second surface S2 of the first lens 111 may be smaller than the difference in curvature radius between the object-side surface and the sensor-side surface of the object-side lens 113 of the aperture stop ST, and further, in absolute value, the difference in curvature radius between the first surface S1 and the second surface S2 of the first lens 111 may be smaller than the difference in curvature radius between the object-side surface and the sensor-side surface of the lens 114 arranged on the sensor side of the aperture stop ST. Here, the object-side lens of the aperture stop ST is the second lens 112, the sensor-side lens is the third lens 113, and the other lenses are the fourth to seventh lenses 114 to 117. The radius of curvature is the average value of the absolute values ​​of the radii of curvature of the object-side surface and the sensor-side surface. 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 sensor-side radius of curvature is Rsi, and the absolute value of the average value of the object-side surface and the sensor-side surface is Ri. The value of (Roi-Rsi) / Ri may be the smallest when i is 6, and the value of (Roi-Rsi) / Ri may be the largest when i is 3. Among them, when i is 6 or 7, the value of (Roi-Rsi) / Ri may be less than 1, for example, 0.6 or less. Therefore, each of the plurality of aspherical lenses may have a difference between the radii of curvature of the object side surface and the sensor side surface, so that the difference between the average values ​​of the radii of curvature of each aspherical lens is smaller than that of the spherical lens.

[0197] Since the first lens 111 is provided with a spherical lens having a thicker thickness, the curvature radius on the optical axis can be increased, and the difference between the curvature radii of the object side surface and the sensor side surface is not greatly reduced, thereby being able to improve assemblability.

[0198] The curvature radius of the sixth lens 116 on the optical axis may be smaller than the curvature radius of the first spherical lens 111. The curvature radius of the seventh lens 117 on the optical axis may be larger than the curvature radius of the sixth lens 116. Therefore, the aspherical seventh lens 117 may guide light incident through the first lens 111 to the sixth lens 116 to the entire area of ​​the image sensor 300. The curvature radii of the first surface S1 and the second surface S2 of the first lens 111 on the optical axis are defined as L1R1, L1R2, the curvature radii of the thirteenth surface S13 and the fourteenth surface S14 of the seventh lens 117 on the optical axis are defined as L7R1, L7R2, and the curvature radii of each lens surface of the second lens 112 to the sixth lens 116 on the optical axis can be defined as L2R1, L2R2, L3R1, L3R2, L4R1, L4R2 (L5R1), L5R2, L6R1, and L6R2.

[0199] Condition 1: 0<|L1R1 / L1R2|<1

[0200] Condition 2: 0<|L2R1 / L2R2|<1

[0201] Condition 3: 0 <L3R1 / L3R2<0.5

[0202] Condition 4: 0 <L4R1 / L4R2<1

[0203] Condition 5: 1 <L5R1 / L5R2<5

[0204] Condition 6: 0.5 <L6R1 / L6R2<1.2

[0205] Condition 7: 1 <L7R1 / L7R2<2.2

[0206] Condition 8: |L1R2-L1R1|<|L2R2-L2R1|<|L3R2-L3R1|

[0207] Condition 9: 5mm≤(L7R1-L7R2)≤25mm

[0208] Condition 10: 25mm≤L1R12≤60mm

[0209] Here, L1R12 is an average value of the curvature radii of the first surface S1 and the second surface S2 of the first lens 111 .

[0210] Describing the thickness of the lens, the center thickness CT1 of the first lens 111 may be greater than the center thicknesses CT2, CT3, CT5, CT56, and CT7 of the second lens 112, the third lens 103, the fifth lens 105, the sixth lens 106, and the seventh lens 117, and may have the maximum thickness in the lens portion 100A. The center thickness CT7 of the seventh lens 117 may be less than the center thicknesses CT1-CT4 of the first lens 111 to the fourth lens 114, and the center thickness CT5 of the fifth lens 115 may have the minimum thickness in the lens portion 100A. The center thickness CT1 of the first lens 111 may be less than the center thickness CT45 of the cemented lens 145A. The edge thickness ET1 of the first lens 111 may be greater than the edge thickness ET45 of the cemented lens 145A. The center thickness and edge thickness of each lens may satisfy the following conditions.

[0211] Condition 1: 0.6 <CT1 / ET1<1.2

[0212] Condition 2: 0.5 <CT2 / ET2<2

[0213] Condition 3: 1 <CT3 / ET3<5

[0214] Condition 4: 1.2 <CT4 / ET4<5

[0215] Condition 5: 0 <CT5 / ET5<1

[0216] Condition 6: 0.6 <CT6 / ET6<3

[0217] Condition 7: 0.6 <CT7 / ET7<1.2

[0218] Condition 8: 0.8<∑CT / ∑ET<1.2

[0219] In this way, the difference between the center thickness and the edge thickness of each lens can be set to be greater than 0.6 mm and less than 3 mm. This allows aspherical lenses to be placed on the sixth lens 116 and the seventh lens 117 to effectively guide light without increasing the difference between the center thickness and the edge thickness of each lens. In addition, by designing the difference between the center thickness and the edge thickness of each lens to be smaller, the influence on the optical characteristics due to assembly can be suppressed.

[0220] In addition, the difference between the maximum center thickness and the minimum center thickness in the lens can be greater than 3 mm, for example, in the range of 4 mm to 9 mm or 4.5 mm to 6 mm. That is, even if the center thickness of the final aspherical lens is provided thinly, the optical performance is not degraded, and the thickness of the camera module can be provided slim.

[0221] The center distance CG7 between the sixth lens 116 and the seventh lens 117 is the largest and is greater than the center distance between the spherical lens and the aspherical lens. The center distance CG6 between the sixth lens 116 and the seventh lens 117 may satisfy the following condition: CG1 < CG2 < CG6. That is, the distance CG6 between the adjacent object-side spherical lens and the sensor-side aspherical lens may satisfy the following condition: CT7 < CG6 < CT6 < CT1. The center thickness of each lens and the center distance between adjacent lenses may satisfy the following conditions.

[0222] Condition 1: 20 < CT1 / CG1 < 60

[0223] Condition 2: 2 ≤ CT1 / CG6 < 5

[0224] Condition 3: 1 < CT6 / CG6 < 5

[0225] Condition 4: 5 < CT45 < CG5 < 10

[0226] Condition 5: 0.1 < CG2 / ∑CG < 0.6

[0227] By making the maximum center thickness between the lenses at least twice the maximum center distance, for example, in the range of 2 to 4 times, a camera module can be provided in which the aspherical lens is applied to the incident side and the output side of the optical system without increasing the center distance compared to the center thickness of each lens. Here, if 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 on the object side with respect to 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) When i is 1, the ratio of CTi / CGi can be the largest, and when i is 5, the ratio of CTi / CGi can be the smallest.

[0228] When the distance from the center of the object-side surface of the first lens 111 to the surface of the image sensor 300 along the optical axis is TTL, the following conditions can be satisfied.

[0229] Condition 1: 0 < CT1 / TTL < 0.5

[0230] Preferably, Condition 1 can satisfy 0 < CT1 / TTL < 0.25.

[0231] Condition 2: 0 < CT2 / TTL < 0.5

[0232] Preferably, Condition 2 can satisfy 0 < CT1 / TTL < 0.1.

[0233] Condition 3: 0 < CT3 / TTL < 0.1

[0234] Condition 4: 0.1 <CT4 / TTL<0.25

[0235] Condition 5: 0 <CT5 / TTL<0.1

[0236] Condition 6: 0 <CT6 / TTL<0.2

[0237] Condition 7: 0 <CT7 / TTL<0.1

[0238] The ratio of CT1 / TTL in condition 1 may be greater than the values ​​in conditions 2 to 7.

[0239] Regarding the effective diameter, the lens with the largest effective diameter may be the third lens 113 adjacent to the aperture stop. The third lens 113 with the largest effective diameter may be a spherical lens. The lens with the smallest effective diameter may be the lens closest to the image sensor 300, for example, the seventh lens 117. The effective diameter may satisfy the following conditions.

[0240] Condition 1: CA22 <CA12

[0241] Condition 2: CA71 <CA72

[0242] Condition 3: CA22 <CA31

[0243] Condition 4: CA61 <CA51<CA41

[0244] Condition 5: CA2 <CA1<CA3

[0245] Condition 6: CA5 <CA4<CA3

[0246] If the refractive index is explained, the refractive index of the first lens 111 is the largest among the lenses and can be 1.75 or more, for example, 1.85 or more. The refractive index of the fourth lens 114 is the smallest among the lenses. The difference between the largest refractive index and the smallest refractive index can be 0.25 or more, for example, 0.30 or more. By adjusting the refractive indices of the spherical lens and the aspherical lens, the incident efficiency can be increased, and the incident light can be guided to the image sensor 300. If the Abbe number is explained, the Abbe number of the sixth lens 116 is the largest among the lenses and can be 60 or more. The Abbe number of the seventh lens 117 is the smallest among the lenses. The difference between the largest refractive index and the smallest Abbe number can be 30 or more. The Abbe numbers of the third lens 113 and the fourth lens 114 adjacent to the aperture stop ST are made larger than the Abbe numbers of the second lens 112 and the fifth lens 115, and the Abbe number of the seventh aspherical lens 117 closest to the image sensor 300 is made the smallest, thereby controlling the dispersion of the light traveling between the lenses made of glass and increasing the dispersion between the spherical lens and the aspherical lens to guide it to the image sensor 300.

[0247] If the average effective diameter of the spherical lens is GL_CA_Aver and the average effective diameter of the aspherical lens is GM_CA_Aver, the following condition can be satisfied: GM_CA_Aver < GL_CA_Aver. If the average center thickness of the spherical lens is GL_CT_Aver and the average center thickness of the aspherical lens is GM_CT_Aver, the following condition can be satisfied: GM_CT_Aver < GL_CT_Aver. If the average refractive index of the spherical lens is GL_nd_Aver and the average refractive index of the aspherical lens is GM_nd_Aver, the following condition can be satisfied: GM_nd_Aver < GL_nd_Aver. If the average Abbe number of the spherical lens is GL_Ad_Aver and the average Abbe number of the aspherical lens is GM_Ad_Aver, the following condition can be satisfied: GL_Ad_Aver < GM_Ad_Aver.

[0248] The focal lengths F1, F5, and F7 of the first lens 111, the fifth lens 115, and the seventh lens 117 can have negative refractive powers, and the focal lengths F2, F3, F4, and F6 of the second lens 112, the third lens 113, the fourth lens 114, and the sixth lens 116 can have positive refractive powers. In addition, the sixth lens 116 and the seventh lens 117, which are arranged adjacent to each other, can satisfy the following conditions.

[0249] Condition 1: The refractive index of the lens with positive refractive power < the refractive index of the lens with negative refractive power

[0250] Condition 2: Dispersion of a lens with positive refractive power > dispersion of a lens with negative refractive power

[0251] Here, because the sixth lens 116 has a positive refractive power and the seventh lens 117 has a negative refractive power, the refractive index of the sixth lens 116 is smaller than the refractive index of the seventh lens 117, and the dispersion value of the sixth lens 116 is larger than the dispersion value of the seventh lens 117 according to the following conditions 1 and 2. The chromatic aberration occurring in the fifth lens can be corrected by an aspherical lens. In addition, by satisfying that the refractive index difference between the sixth lens 116 and the seventh lens 117 arranged in sequence is 0.25 or more and 0.5 or less and the Abbe number difference is 30 or more and 70 or less, the chromatic aberration occurring in the spherical lens can be compensated by an aspherical lens. The optical system 1001 generates chromatic aberration, and the chromatic aberration is corrected by using the cemented lens 145A 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 amount of change in the lens characteristics caused by the temperature change is the same for lenses of the same material, it is effective to correct the chromatic aberration between lenses of the same material even when the temperature changes. By using the fourth lens 114 and the fifth lens 115 and the sixth lens 116 and the seventh lens 117, the chromatic aberration between the spherical lens and the aspherical lens can be corrected mutually, and the TTL of the optical system can be reduced. The refractive index difference between the fourth lens 114 and the fifth lens 115 as a cemented lens satisfies 0.01 or more and 0.25 or less, and the Abbe number difference satisfies 20 or more and 50 or less, and the chromatic aberration generated by 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 to compare the values. In addition, by arranging a glass lens with a relatively high Abbe number on the object side of the aspherical seventh lens 117, dispersion can be reduced by the glass lens, and dispersion can be increased by the aspherical lens.

[0252] If the focal length is expressed as an absolute value, the focal length of the seventh lens 117 is the largest among the lenses and may be 45 or more. The focal length of the fifth lens 115 is the smallest among the lenses. The difference between the maximum focal length and the minimum focal length may be 35 or more. By maximizing the focal length of the lens closest to the sensor and minimizing the focal length of the fifth lens 115, 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 at the periphery of the field of view.

[0253] The critical point and the Sag value of the object side surface and the sensor side surface of the seventh lens 117 will be described with reference to the first embodiment. It can be seen that the sensor side surface of the seventh lens 117 has a critical point between a point spaced 1.8 mm apart and a point spaced 2.8 mm apart based on the optical axis in a direction perpendicular to the optical axis. For example, the sensor side surface of the seventh lens 117 increases the Sag value from the optical axis to a point of 2.0 mm ± 0.4 mm in a direction perpendicular to the optical axis, and then decreases the Sag value from the point of 2.0 mm ± 0.4 mm toward the edge. If there is a critical point on the sensor side surface of the seventh lens 117, that is, the sensor side surface of the last lens, that is, the lens surface closest to the sensor, TTL can be reduced, making it easy to miniaturize and lighten the optical system.

[0254] like Fig.15 As shown in , among the lenses of the lens portion 100A of the embodiment, the lens surfaces of the sixth lens 116 and the seventh lens 117 may include an aspherical surface having a 30th order aspherical coefficient. For example, the sixth lens 116 and the seventh lens 117 may include a lens surface having a 30th order aspherical coefficient. As described above, since the aspherical surface having a 30th order aspherical coefficient (non-zero value) can significantly change the aspherical shape of the periphery, the optical performance of the periphery of the FOV can be well compensated. Fig.16 As shown in , the thicknesses T1-T7 of the first to seventh lenses 111, 112, 113, 114, 115, 116, and 117 and the distances G1-G6 between two adjacent lenses can be set. Fig.16 As shown in , the thickness T1-T7 of each lens in the Y-axis direction can be expressed at intervals of 0.1 mm or 0.2 mm or more, and the distances G1-G6 between adjacent lenses can be expressed at intervals of 0.1 mm or 0.2 mm or more. The center thickness CT45 of the cemented lens 145 can 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 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 the center, the minimum thickness is the edge, and the maximum thickness can be 1.1 times or more of the minimum thickness, for example, 1.1 to 2.5 times, and the following conditions can be satisfied: 0 mm <CT45-ET45<1.5mm。

[0255] like Fig.17 As shown in Fig.13 The CRA of the optical system and camera module may be 10 degrees or greater, for example, in the range of 10 to 35 degrees or 10 to 25 degrees. Fig. 20As shown in , a graph showing relative illumination or ambient light according to image height in an optical system according to an embodiment shows that the ambient light ratio from the center to the diagonal end of the image sensor is 70% or more, for example, 75% or more. That is, it can be seen that there is almost no difference in ambient illumination (zoom positions 1, 2, 3) up to 4.4 mm from the optical axis depending on the difference in temperature. Fig.18 It is shown Fig.13 The graph of the diffraction MTF at room temperature in the optical system of FIG. 1 is a graph showing the brightness ratio (modulation) according to the spatial frequency. In the second embodiment of the present invention, the MTF deviation between the low temperature and the high temperature based on the room temperature can be less than 10%, that is, 7% or less.

[0256] Fig.19 It is shown Fig.13 This is a graph showing the aberration characteristics of an optical system at room temperature. Fig.19 In the aberration graph of , longitudinal spherical aberration, astigmatism field curve and distortion are measured from left to right. Fig.19 In , the X-axis may represent focal length (mm) and distortion (%), and the Y-axis may represent the height of the image. In addition, the graph for spherical aberration is a graph for light of wavelength bands of about 435 nm, about 486 nm, about 546 nm, about 587 nm, and about 656 nm, and the graph for astigmatism and distortion is a graph for light of wavelength band of about 546 nm. Fig.19 In the aberration diagram, it can be understood that the closer each curve is to the Y-axis at room temperature, the better the aberration correction function is. It can be seen that the optical system 1001 according to the embodiment has a measurement value close to the Y-axis in almost all areas. That is, the optical system 1001 according to the embodiment has improved resolution not only in the central part of the FOV but also in the peripheral part and can have good optical performance. Here, the low temperature is -20 degrees or lower, for example, in the range of -20 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 is almost unchanged.

[0257] Therefore, it can be seen that the optical system according to the second embodiment has a change in optical characteristics due to the change in temperature from low temperature to high temperature. For example, the change rates of EFL, TTL, BFL, F-number, and diagonal FOV are 10% or less, that is, 5% or less, for example, within the range of 0 to 5%. Such a design can perform temperature compensation for the aspherical lens even when using at least one or two or more aspherical lenses, thereby preventing a decrease in the reliability of optical characteristics. The optical system according to the above embodiment 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.

[0258] The optical systems 1000 and 1001 according to the above embodiment can satisfy at least one or two or more of the mathematical equations described below. Therefore, the optical systems 1000 and 1001 according to the embodiment can have improved optical characteristics. For example, when the optical systems 1000 and 1001 satisfy at least one formula, the optical systems 1000 and 1001 can effectively control aberration characteristics such as chromatic aberration and distortion, and can have good optical performance not only at the central part of the FOV but also at the peripheral part. In addition, the optical systems 1000 and 1001 can have improved resolution. In addition, the thickness of the lens described in the formula at the optical axis OA and the distance between adjacent lenses on the optical axis OA can refer to the above embodiment.

[0259] [Equation 1] 2 < CT1 / CT2 < 8

[0260] In Equation 1, CT1 means the central thickness of the first lenses 101 and 111, and CT2 means the central thickness of the second lenses 102 and 112. Equation 1 can improve the chromatic aberration of the optical system by setting the difference in the central thickness of the first and second lenses. Equation 1 satisfies 3 < CT1 / CT2 < 7 in the first embodiment and 2 < CT1 / CT2 < 4 in the second embodiment. By increasing the thickness of the first lenses 101 and 111 made of glass, the change in optical characteristics due to temperature change can be suppressed, and the optical performance of the central and peripheral parts of the FOV can be improved.

[0261] [Equation 2] (CT7 * CA7) < (CT1 * CA1)

[0262] CT7 is the center thickness of the seventh lenses 107 and 117, CA1 is the effective diameter of the first lenses 101 and 111, and CA7 is the effective diameter of the seventh lens. The effective diameter is the average of the effective diameters of the object-side surface and the sensor-side surface of each lens. Preferably, the following conditions can be satisfied: CT7 < CT1 and CA7 < CA1. By setting the thicknesses and effective diameters of the aspherical first lens and the seventh lens, the optical system can improve spherical aberration and provide a thin camera module.

[0263] [Equation 3] Po1 < 0

[0264] In Equation 3, Po1 represents the refractive power of the first lens 101 and can be set to have a shorter effective focal length (F) compared to the TTL in the optical system for the performance of 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.

[0265] [Equation 4] 1.7 < n2 < 2.2

[0266] n2 is the refractive index of the d-line of the second lenses 102 and 112. Equation 4 sets the refractive index of the second lens to be relatively high so that it can control the factors that affect 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 be satisfied: 1.75 < n2 < 2.0. If it is designed to be lower than the lower limit of Equation 4, although the aberration can be reduced to obtain performance, the refractive power of the second lenses 102 and 112 becomes weak, making it impossible to effectively collect light, which may degrade 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 is difficult to obtain materials. In addition, if the refractive index of the second lenses 102 and 112 is designed to be lower than the lower limit of Equation 4, in order to increase the refractive power of the sixth and seventh lenses, the curvature radii of the sixth and seventh lenses must be increased, and in this case, lens manufacturing becomes more difficult, the lens defect rate increases, and the yield may decrease.

[0267] [Equation 4-1] 1.60 ≤ Aver(n1:n7) < 1.77

[0268] In Equation 4-1, Aver(n1:n7) is the average value of the d-line refractive index values of the first lens to the seventh lens. When the optical systems 1000 and 1001 according to this embodiment satisfy Equation 4-1, the optical systems 1000 and 1001 can set the resolution and suppress the influence on the TTL.

[0269] [Equation 4-2] 1.0 < GL_nd_Aver / GM_nd_Aver < 1.5

[0270] GL_nd_Aver is an average refractive index of spherical lenses in the lens sections 100 and 100A, and GM_nd_Aver is an average refractive index of aspherical lenses. The first lens and the second lens having high refractive index are located on the object side, which can increase dispersion.

[0271] [Formula 4-3] 1.8≤n1<2.2

[0272] n1 is the d-line refractive index of the first lenses 101 and 111. Formula 4-3 can increase dispersion by setting the refractive index of the first lens higher.

[0273] [Formula 5]20 <FOV_H<40

[0274] In Formula 5, FOV_H represents the horizontal field of view, and can set the range of the vehicle-mounted optical system. Formula 5 preferably satisfies: 25≤FOV_H≤35, or a range of 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, if 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, for example, two or more aspherical lenses, are mixed and used in the optical systems 1000 and 1001, 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 may be satisfied: 10 <FOV_V<FOV_H。

[0275] [Formula 6] L1R1<0

[0276] L1R1 means the radius of curvature of the first surface S1 of the first lens 101 on the optical axis, and can be set to be less than 0. When this formula 6 is satisfied, the shape of the optical system can be limited. The object side surface of the first lens 101 is concavely formed on the optical axis, so that when it contacts with an external structure, surface damage can be prevented, and the incident light can be refracted in a direction away from the optical axis. In addition, the following condition can be satisfied: L1R1*L1R2>0. Therefore, the center thickness and edge thickness of the first lenses 101 and 111 can be increased, and the gap between the first lenses 101 and 111 and the second lenses 102 and 112 can be reduced.

[0277] [Formula 6-1] L3R1>0, L2R1>0

[0278] L3R1 is the radius of curvature of the object-side surface of the third lens 103 on the optical axis, and L2R1 is the radius of curvature of the object-side surface of the second lens on the optical axis. Since the first lens 101 has a meniscus shape convex toward the object side, it can be closely attached to the center of the object-side surface of the second lenses 102 and 112, and the radius of curvature of the sensor-side surface of the second lenses 102 and 112 can be increased to increase the distance from the third lenses 103 and 113. Since the effective diameters of the first to third lenses are large and the average radius of curvature is provided as a spherical lens, the assembly performance can be improved. This can reduce the influence on the optical characteristics of the light traveling through the first to third lenses. In addition, since the following condition can be satisfied: L3R2>L3R1, it is possible to control the light so that the effective diameter of the lens (ie, the fourth to seventh lenses) arranged on the sensor side is not larger than the effective diameter of the third lens, and the TTL can be reduced. If the following condition is satisfied: L3R1>L3R2, there is a problem that aberration occurs between the object-side surfaces of the first lens and the second lens, or the effective diameter of the lens on the sensor side increases, or the TTL increases.

[0279] [Formula 7] 0.8 <BFL / L7S2_max_sag to Sensor<3

[0280] The BFL is the optical axis distance from the center of the sensor side surface of the last lens (i.e., the seventh lens) to the surface of the image sensor. The L7S2_max_sag to Sensor can be the distance in the optical axis direction from the maximum Sag value of the seventh lens 107 to the image sensor 300. If the optical system satisfies Equation 7, the TTL can be reduced, and the conditions for manufacturing the camera module can be set. In addition, the L7S2_max_sag to Sensor can set the space in which the optical filter 500 and the cover glass 400, which are positioned between the image sensor 300 and the seventh lenses 107 and 117, may be placed. When the range of Equation 7 is less than the lower limit, the space for setting the circuit structures such as the optical filter and the image sensor becomes more restricted, and the process of assembling the circuit structures such as the filter and the image sensor into the optical system may become difficult. When the range of Equation 7 is greater than the upper limit, the process of assembling the circuit structures such as the filter and the image sensor into the optical system is easy, but the TTL becomes longer, making it difficult to miniaturize the optical system. That is, Equation 7 can set the minimum distance between the image sensor 300 and the last lens, and preferably, the following condition can be satisfied: L7S2_max_sag to Sensor < BFL. In addition, if the last lens does not have a point that protrudes more toward the image sensor than the center of the sensor side surface, the value of Equation 6 can be equal to the BFL (back focal length). The BFL is the optical axis distance from the image sensor 300 to the center of the sensor side surface of the last lens. Specifically, if the following equation is satisfied: 1 < BFL / L7S2_max_sag to Sensor < 1.2, the manufacturing convenience and the reduction of the TTL are easier.

[0281] [Equation 8] 3 < CT1 / CT7 < 9

[0282] If Equation 8 is satisfied, the aberration characteristics can be improved and the reduced influence on the optical system can be set. Equation 8 can preferably be satisfied: 3 < CT1 / CT7 < 7. Equation 8 can set the center thicknesses of the aspherical lenses of the first lens on the object side and the seventh lens on the sensor side of the optical system and limit the difference in their center thicknesses. Therefore, the chromatic aberration of the optical system can be improved, and good optical performance can be achieved under the set field of view and the TTL can be controlled.

[0283] [Equation 8-1] 0.5 < CT1 / CA11 < 1

[0284] In Equation 2, the central 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, degradation of the strength and optical characteristics of the glass lens can be prevented. If it is below the range of Equation 1, the lens may be damaged or difficult to process, and if it is greater than the above range, the TTL may increase and the weight of the optical system may become heavy. Preferably, 0.6 < CT1 / CA11 < 1 can be satisfied.

[0285] [Equation 9] 0 < CT1 / CT6 < 3

[0286] CT6 means the central thickness of the sixth lens 106. When the optical system satisfies Equation 9, the aberration characteristics can be improved, and the reduced influence on the optical system can be set. Equation 9 can preferably be satisfied: 0 < CT1 / CT6 < 2. Equation 9 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.

[0287] [Equation 10] 0 < CT45 / CT6 < 5

[0288] In Equation 10, CT45 is the central thickness of the fourth lens and the fifth lens, for example, the central 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 Equation 10, the thicknesses of the cemented lens and the adjacent sixth lenses 106 and 116 can be set to improve the aberration characteristics, and the following equation can preferably be satisfied: 1 < CT45 / CT6 < 3. Here, the following equation can be satisfied: CT45 > ET45, and ET45 is the edge thickness of the cemented lens.

[0289] [Equation 11] 0 < |L2R1 / L4R2| < 1

[0290] In Equation 11, L2R1 means the radius of curvature of the first surface S1 of the second lenses 102 and 112, and L4R2 means the radius of curvature of the eighth surface S8 of the fourth lenses 104 and 114. When the optical systems 1000 and 1001 according to the embodiments satisfy Equation 11, the optical systems 1000 and 1001 can have improved aberration characteristics.

[0291] [Equation 12] 0 < CT45 - ET45 < 2 mm

[0292] 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 can be set to improve aberration characteristics, and the following condition can be satisfied: 1mm≤CT45 / ET45<1.5mm. ET45 can be greater than the edge thickness ET1-ET7 of each of the first to seventh lenses.

[0293] [Formula 13] 0 <CA11 / CA31<2

[0294] In Formula 13, CA11 means an effective diameter of the first surface S1 of the first lens 101 and 111, and CA31 means an effective diameter of the fifth surface S5 of the third lens 103 and 113. If Formula 13 is satisfied, the optical systems 1000 and 1001 can control incident light and set factors affecting aberrations, and the following conditions can be satisfied: 0.5 <CA11 / CA31<1.5。

[0295] [Formula 14] 0 <CA72 / CA42<2

[0296] In Formula 14, CA42 means the effective diameter of the eighth surface S8 of the fourth lens 104 and 114, and CA72 means the effective diameter of the fourteenth surface S14 of the seventh lens 107 and 117. If Formula 14 is satisfied, the optical systems 1000 and 1001 can control the incident light path and set factors for performance changes according to CRA and temperature. Preferably, Formula 14 can satisfy: 0.5 <CA72 / CA42<1.0。

[0297] [Formula 15] 0 <CA12 / CA21<2

[0298] 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 systems 1000 and 1001 according to the embodiments satisfy Formula 15, the optical systems 1000 and 1001 can control light traveling to the first lens group LG1 and the second lens group LG2, and can set factors that affect the reduction of lens sensitivity. Formula 15 may preferably satisfy: 1 <CA12 / CA21<1.5。

[0299] [Formula 16] 0 <CA31 / CA42<2

[0300] CA31 means the effective diameter of the fifth surface S5 of the third lens 103 and 113, and CA42 means the effective diameter of the eighth surface S8 of the fourth lens 104 and 114. When the optical systems 1000 and 1001 according to the embodiment satisfy Formula 16, the size of the spherical lens can be set. Formula 16 can preferably satisfy: 1 <CA31 / CA42<1.5。

[0301] [Formula 17] 0.1 <CA41 / CA52<2.1

[0302] 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 systems 1000 and 1001 according to the embodiment satisfy Formula 17, the optical systems 1000 and 1001 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 can preferably satisfy: 1 <CA41 / CA42<1.6。

[0303] [Formula 18] 0 <CA52 / CA61<2

[0304] CA61 means the eleventh surface S11 of the sixth lens 106 and 116. When the optical systems 1000 and 1001 according to the embodiment satisfy Formula 18, it is possible to set 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. Therefore, the optical systems 1000 and 1001 can improve chromatic aberration and set the size and curvature radius between the sensor-side surfaces of the cemented lenses. Therefore, it is possible to set the effective diameter size of the fifth lens and the sixth lens arranged on the object side larger than the last lens. Formula 18 preferably satisfies: 0.5 <CA52 / CA61<1.2。

[0305] [Formula 18-1] 1mm <CA51-CA52<3mm

[0306] In Formula 18-1, the effective diameter difference between the object-side surface (L5S1) and the sensor-side surface (L5S2) of the fifth lens can be greater than 1 mm, and can be greater than the effective diameter difference (mm) between the sixth lens and the seventh lens. Therefore, by increasing the effective diameter difference between the object-side surface and the sensor-side surface of the fifth lens, where the fifth lens is a spherical lens adjacent to the aspherical lens, light refracted through the fifth lens can continue within the effective area of ​​the aspherical lens.

[0307] [Equation 18-2] CA4 > CA5 > CA6

[0308] [Equation 18-3] CA41 > (ImgH * 2)

[0309] [Equation 18-4] CA51 > (ImgH * 2)

[0310] [Equation 18-5] CA62 < (ImgH * 2)

[0311] In Equations 18-2 to 18-5, CA5 is the effective diameter of the fifth lenses 105 and 115, CA6 is the effective diameter of the sixth lenses 106 and 116, ImgH is 1 / 2 of the diagonal length of the image sensor 300, and CA62 is the effective diameter of the sensor-side surface of the sixth lens. Accordingly, the optical path can be set to the area of the image sensor 300 by the effective diameter of the fifth lenses 105 and 115, the effective diameter of the object-side surfaces of the fourth lenses 104 and 114, and the effective diameter of the object-side surfaces of the fifth lenses 105 and 115. In this embodiment, since the n-th lens is provided as an aspherical lens, the ratio of the effective diameters of adjacent spherical lenses and cemented lenses can satisfy Equations 18 to 18-5.

[0312] [Equation 19] 0.2 < GL_CA_Aver / GM_CA_Aver < 2.2

[0313] In Equation 19, GL_CA_Aver means the average effective diameter of glass lenses having spherical surfaces, and GM_CA_Aver means the average effective diameter of glass molded 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 incident light can be effectively guided. Equation 19 preferably satisfies: 1 < GL_CA_Aver / GM_CA_Aver < 1.5. That is, the difference in effective diameter between the spherical lens and the aspherical lens can be set not to be large. Here, nGL > nGM can be satisfied. nGL is the number of spherical glass lenses, and nGM is the number of aspherical glass lenses.

[0314] [Equation 20] 0 < GL_nd_Aver / GM_nd_Aver < 1.60

[0315] In Equation 19, GL_nd_Aver is the average refractive index of glass material lenses, for example, the average refractive index of the second to fifth lenses. GM_nd_Aver is the average refractive index of the first and seventh lenses. Preferably, the refractive index of the spherical lens and the refractive index of the aspherical lens can be set to satisfy the following condition: 0.7 < GL_nd_Aver / GM_nd_Aver < 1.5.

[0316] [Formula 20-1] 0<ΣGM_nd / ΣGL_nd<1

[0317] ΣGM_nd is the sum of the refractive indices of the glass molded lenses, and ΣGL_nd is the sum of the refractive indices of the spherical glass lenses. Preferably, the following condition may be satisfied: 0.2<ΣGM_nd / ΣGL_nd<0.6. The optical system can adjust the resolution and dispersion by setting the refractive index difference between the spherical lens and the aspherical lens.

[0318] [Formula 21] CA6 or CA7 <CA4

[0319] In Formula 21, CA6 means the effective diameter of the sixth lens 106, CA7 means the effective diameter of the seventh lens 107, and CA4 means the effective diameter of the fourth lens. When Formula 21 is satisfied, the optical system can guide light to the center and peripheral portions of the image sensor 300 and improve chromatic aberration by setting the effective diameters of the sixth lens and the seventh lens disposed between the fourth lenses 104 and 114 and the image sensor 300 to be smaller than the effective diameters of the fourth lenses 104 and 114.

[0320] [Formula 22] CG1 <CG6<CG2

[0321] In Formula 22, CG1 represents the center distance between the first and second lenses, CG2 represents the center distance between the second lens and the third lens, and CG6 represents the center distance between the sixth and seventh lenses. If Formula 22 is satisfied, the center distance from the first lens to the seventh lens can be set so that the center distance can be reduced and the optical performance of the peripheral portion of the FOV can be improved.

[0322] [Formula 22-1] G4<0.01 or CG4<0.01

[0323] 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 can be set as a cemented lens. Here, preferably, CT45 = CT4 + CT5 + CG4 can be satisfied, and the center thicknesses CT4 and CT5 of the fourth lens and the fifth lens and the center distance CG4 of the fourth lens and the fifth lens can be set.

[0324] [Formula 23] 0 <CT7 / CG6<1

[0325] 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. By setting the center thickness CT7 of the seventh lens 107 and the center distance between the sixth lens and the seventh lens in Formula 23, the optical performance of the peripheral portion of the field of view can be improved. Formula 23 preferably satisfies: 0.2 <CT7 / CG6<0.8。

[0326] [Formula 24] CT2<(2*CT3) <CT1

[0327] When the center thicknesses of the first, second and third lenses satisfy Formula 24, incident light can be guided to the aspherical lens through the thickness of the object side spherical lens, and thermal compensation can be performed according to temperature changes, and assembly characteristics can be improved.

[0328] [Formula 25] (3*CT7) <CT1<(2*CT6)

[0329] If the center thicknesses of the first lens, the sixth lens, and the seventh lens satisfy Formula 25, light emitted by the thickness of the sensor-side aspherical lens can be refracted to the entire area of ​​the image sensor, and TTL can be reduced.

[0330] [Formula 26] 2 <CT6 / CT7<5

[0331] In formula 26, by setting the center thickness CT6 of the sixth lens to be thicker than the center thickness CT7 of the seventh lens, factors affecting aberrations can be controlled. Preferably, formula 26 can satisfy: <CT6 / CT7<3。

[0332] [Formula 27] 10 <L7R1 / CT7<40

[0333] L7R1 means the radius of curvature of the thirteenth surface of the seventh lens on the optical axis. In Formula 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 in the center and peripheral parts of the field of view. Preferably, Formula 27 can satisfy: 18 <L7R1 / CT7<38。

[0334] [Formula 28] 0 <L5R2 / L7R1<10

[0335] L5R2 means the curvature radius of the tenth surface of the fifth lens on the optical axis. In Formula 28, 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 and seventh lenses can be controlled. Therefore, good optical performance can be achieved in the center and peripheral parts of the viewing angle. Preferably, Formula 28 can satisfy 0 <L5R2 / L7R1<1。

[0336] [Equation 29] L1R1*L1R2>0

[0337] L1R1 is the radius of curvature of the object-side surface of the first lens on the optical axis, and L1R2 is the radius of curvature of the sensor-side surface of the first lens on the optical axis. If Equation 29 is satisfied, the chromatic dispersion of incident light can be adjusted by controlling the refractive power of the first lens, and the assemblability of the first lens can be improved. Preferably, the following condition can be satisfied: L1R1+L1R2<0.

[0338] [Equation 30] 0<L5R1 / L4R2<2

[0339] L5R1 is the radius of curvature of the object-side surface of the fifth lens on the optical axis, and L4R2 is 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 expressed as a cemented lens. Preferably, the following condition can be satisfied: L5R1 / L4R2 = 1.

[0340] [Equation 30-1] 1<L4R1 / L5R2<2

[0341] L4R1 is the radius of curvature of the object-side surface of the cemented lens on the optical axis, and L5R2 is the radius of curvature of the sensor-side surface of the cemented lens on the optical axis. When Equation 30-1 is satisfied, the cemented lens refracts incident light in the direction of the optical axis and can suppress an increase in the effective diameter of the lens between the cemented lens and the image sensor. In addition, L5R2 has a radius of curvature of 12 mm or less and can have the minimum radius of curvature within the lens cross section.

[0342] [Equation 31] 0<L6R2 / L6R1<3

[0343] 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 are set such that light can be effectively refracted from the cemented lens toward the aspherical lens. Equation 31 preferably satisfies: 1<L6R2 / L6R1<2. The object-side surface and the sensor-side surface of the sixth lens are aspherical, and when the difference in the radii of curvature of the aspherical object-side surface and the aspherical sensor-side surface satisfies the above range, the assemblability of the sixth lens can be improved, and the influence on the optical characteristics due to temperature change can be suppressed.

[0344] [Equation 31-1] 1<L7R1 / L7R2<3

[0345] L7R1 and L7R2 denote the radii of curvature on the optical axis of the object-side surface and the sensor-side surface of the seventh lens. In Equation 31-1, the radii of curvature of the aspherical object-side surface and the aspherical sensor-side surface of the seventh lens are set such that light can be refracted through the seventh lens to the entire area of the image sensor. Equation 31-1 can preferably satisfy: 1 < L7R1 / L7R2 < 2. Therefore, when 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 changes can be suppressed.

[0346] [Equation 32] 0 < CT_Max / CG_Max < 1

[0347] 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 at the set viewing angle, and the TTL can be reduced. Preferably, the first embodiment can satisfy: 0.1 < CT_Max / CG_Max < 0.5.

[0348] [Equation 33] 2 < ΣCT / ΣCG < 7

[0349] ΣCT is the sum of the center thicknesses of the lenses, and ΣCG is the sum of the center distances between adjacent lenses. When Equation 33 is satisfied, the optical system can have good optical performance at the focal length at the set field of view, and the TTL can be reduced.

[0350] [Equation 34] 8 < ΣIndex < 30

[0351] ΣIndex denotes the sum of the refractive indices at the d-line of each of the plurality of lenses. If Equation 34 is satisfied, the optical systems 1000 and 1001 in which aspherical lenses and spherical lenses are mixed can control the TTL and can have improved resolution. In addition, when the number of spherical lenses is greater than the number of aspherical lenses, thermal compensation can be performed by the spherical lenses with relatively thick thicknesses, and the sum of the TTL and the refractive index of the lenses can be set. Equation 34 preferably satisfies: 10 < ΣIndex < 13.

[0352] [Equation 35] 10 < ΣAbb / ΣIndex < 50

[0353] ΣAbb denotes the sum of the Abbe numbers of each of the plurality of lenses. When Equation 35 is satisfied, the optical systems 1000 and 1001 can have improved aberration characteristics and resolution. Equation 35 can control the optical characteristics by setting the sum of the Abbe and the sum of the refractive indices, and preferably satisfies: 20 < ΣAbb / ΣIndex < 35.

[0354] [Formula 36] Distortion < 2

[0355] Distortion means the maximum value or the absolute value of the maximum value of the distortion from the center (0.0F) to the diagonal end (1.0F) of the image sensor based on the optical characteristics detected by the image sensor 300. When the optical systems 1000 and 1001 satisfy Formula 36, ​​the optical systems 1000 and 1001 can improve the distortion characteristics and set conditions for image processing. Preferably, distortion <1 can be satisfied.

[0356] [Formula 37] 0<ΣCT / ΣET<2

[0357] ΣCT is the sum of the thickness of the center of the lens, and ΣET is the sum of the thickness of the edge of the effective area of ​​the lens. When formula 37 is satisfied, the optical system can have good optical performance at the focal length at the set field of view, and can reduce TTL. Formula 37 preferably satisfies 1<ΣCT / ΣET<1.5.

[0358] [Formula 38] 0.5 <CA11 / CA_Min<2.5

[0359] CA11 means the effective diameter of the object-side surface of the first lens, and CA_Min means the minimum effective diameter among the object-side surface and the sensor-side surface of the lens. If formula 38 is satisfied, the optical system can provide a thinner module while maintaining incident light control and optical performance. Formula 38 preferably satisfies: 1 <CA11 / CA_Min<2.5。

[0360] [Formula 39] 1 <CA_Max / CA_Min<5

[0361] CA_Max means the maximum effective diameter among the object-side surface and the sensor-side surface of the lens. If Formula 39 is satisfied, the optical system can be sized for a slim and compact structure while maintaining optical performance. Formula 39 preferably satisfies: 1 <CA_Max / CA_Min<2.5。

[0362] [Formula 40] 1 <CA_Max / CA_Aver<3

[0363] CA_Aver means the average of the effective diameters of the object-side surface and the sensor-side surface of the lens. If formula 40 is satisfied, the optical system can be sized for a slim and compact structure while maintaining optical performance. Formula 40 preferably satisfies: 1 <CA_Max / CA_Aver<1.7。

[0364] [Formula 41] 0.5 <CA_Min / CA_Aver<2

[0365] If formula 41 is satisfied, the optical system can be sized for a slim and compact structure while maintaining optical performance. Formula 41 preferably satisfies: 0.5 <CA_Min / CA_Aver<1。

[0366] [Formula 42] 1 <CA_Max / (2*ImgH)<3

[0367] Formula 42 can be set to the maximum effective diameter CA_Max of the lens surface and the diagonal length of the image sensor, and if satisfied, the optical system can maintain good optical performance and set the size for a slim and compact structure. Formula 42 preferably satisfies: 1 <CA_Max / (2*ImgH)<2。

[0368] [Formula 43] 1 <TD / CA_Max<4

[0369] 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 formula 43 is satisfied, the total optical axis distance and the maximum effective diameter of the lens can be set, and the size for good optical performance can be set. Formula 43 preferably satisfies: 2 <TD / CA_Max<3。

[0370] [Formula 43-1]TD>SD

[0371] SD is the distance from the position of the aperture stop to the center of the sensor-side surface of the final lens.

[0372] [Formula 44] 1 <F / CA61<10

[0373] F represents the effective focal length (EFL) of the optical system, and may be 10 mm or more, for example, in the range of 10 mm to 20 mm. In Formula 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 reduction (for example, TTL) can be controlled. Formula 44 preferably satisfies: 1 <F / CA61<2。

[0374] [Formula 45] 0 <F / |L1R1|<1

[0375] In formula 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 are set so as to control the influence on the incident light and TTL. Formula 45 preferably satisfies: 0.3 <F / |L1R1|<1。

[0376] [Formula 46] Max (CT / ET) < 3

[0377] Max (CT / ET) means the maximum value of the ratio of the center thickness to the edge thickness of each lens. When Formula 46 is satisfied, the optical system can control the influence on the effective focal length. Formula 46 preferably satisfies: 0 < Max (CT / ET) < 1. Thus, the assemblability of the entire lens can be improved. The maximum value of the ratio of the center thickness to the edge thickness within the lens cross-section of the aspherical lens can satisfy the following condition: 1 < GM_Max (CT / ET) < 1.2. The maximum value of the ratio of the center thickness to the edge thickness within the lens cross-section of the spherical lens can satisfy the following condition: 1.5 < GL_Max (CT / ET) < 2. If the condition of the aspherical lens is less than the lower limit of the above range, it is difficult to manufacture the glass molded lens. That is, it is manufactured by injecting high-temperature resin and hardening at low temperature, but if the thickness difference is large, the lens may shrink unevenly when cooled at low temperature, resulting in a high surface defect rate. In addition, as the temperature changes from -40 degrees to 105 degrees, the aspherical lens shrinks and expands, and during this process, the rate of change of the lens shape is significantly presented, which may deteriorate the optical system performance.

[0378] [Formula 47] 0 < EPD / |L1R1| < 1

[0379] EPD means the size (mm) of the entrance pupil diameter of the optical systems 1000 and 1001, and L1R1 means the radius of curvature of the first surface S1 of the first lens on the optical axis. When the optical systems 1000 and 1001 according to the embodiments satisfy Formula 47, the optical systems 1000 and 1001 can control the incident light. Formula 47 can preferably satisfy: 0.2 < EPD / |L1R1| < 0.7.

[0380] [Formula 48] -5 < F1 / F3 < 0

[0381] F1 is the focal length of the first lens, and F3 is the focal length of the third lens. If Formula 48 is satisfied, the resolution can be improved by controlling the refractive power of the first and third lenses, and it can affect the TTL and the effective focal length (EFL).

[0382] [Formula 48-1] |F5| < F4

[0383] [Formula 48-2] 2*|F5| < F6

[0384] [Formula 48-3] 2*|F5| < |F7|

[0385] F5 is the focal length of the fifth lens, F4 is the focal length of the fourth lens, F6 is the focal length of the sixth lens, and F7 is the focal length of the seventh lens. Therefore, the absolute value of the focal length of the fifth lens closest to the aspherical lens can be smaller than the focal length of the fourth lens and smaller than the focal lengths of the sixth and seventh lenses. Therefore, the refractive power of the last spherical lens can be controlled to effectively guide light to the aspherical lens.

[0386] The aperture stop ST is arranged on the sensor side surface of the second lens 102. The focal length of the lens arranged on the sensor side and closest to the aperture stop ST, which is larger than the aperture stop ST, is greater than 0. In the embodiment of the present invention, the focal length F3 of the third lens 103 should be designed to be greater than 0. In this case, the third lens 103 collects light, so that the effective diameter of the fourth lens to the seventh lens arranged closer to the sensor than the third lens 103 can be prevented from increasing. In addition, since the TTL can be prevented from becoming longer, it is possible to achieve miniaturization of the optical system. The composite focal length of the lens arranged on the sensor side, that is, the lens arranged closer to the sensor than the aperture stop, which is larger than the aperture stop ST, is designed to be greater than 0. In the embodiment of the present invention, the composite focal length of the third lens to the seventh lens is designed to be greater than 0. In this case, the miniaturization of the optical system can be achieved by reducing the TTL at a horizontal field of view FOV_H of 25 to 35 degrees.

[0387] [Formula 49] Po4 * Po5<0

[0388] Po4 is the refractive power value of the fourth lens, and Po5 is the refractive power value of the fifth lens. In other words, the refractive powers of the fourth lens and the fifth lens have opposite refractive powers, so they can improve aberration and effectively guide light using an aspherical lens. If the value of Po4*Po5 is greater than 0, the effect of improving chromatic aberration as a cemented lens will not be significantly presented.

[0389] [Formula 49-1] Po1 (Po4 * Po5)>0

[0390] [Formula 49-2] F45<0 (first embodiment) or F45>0 (second embodiment)

[0391] [Formula 49-3] F4 * F5<0

[0392] Po1 is the refractive power value of the first lens, F45 is the composite 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 formulas 49-1 to 49-3 are satisfied, it is easy to improve the aberration of the optical system using the fourth lens and the fifth lens as a cemented lens, and the incident light can be effectively guided to the aspherical lens.

[0393] [Equation 50] 15 < v4 - v5 < 50

[0394] v4 is the Abbe number of the fourth lens, and v5 is the Abbe number of the fifth lens. If Equation 50 is satisfied, the difference in Abbe numbers of at least two lenses forming the cemented lens can be maintained above a certain value, and chromatic aberration can be improved. Equation 50 is preferably satisfied as: 20 < v4 - v5 < 40. If the cemented lens is less than the lower limit of Equation 50, it may not be significant for improving the aberration characteristics of the optical system.

[0395] [Equation 51] 0 < |F1 / F| < 20

[0396] Equation 51 sets the relationship between the focal length F1 of the first lens and the effective focal length F, and can set the TTL of the optical system. Equation 51 is preferably satisfied as: 1 < |F1 / F| < 5.

[0397] [Equation 52] 0 < |F5 / F6| < 1

[0398] In Equation 52, the relationship between the focal lengths F5 and F6 of the fifth and sixth lenses can be set so that the refractive power and optical path of the spherical lens and the adjacent aspherical lens can be adjusted, and the resolution can be improved. Equation 52 is preferably satisfied as: 0 < |F5 / F6| < 0.5.

[0399] [Equation 53] 0 < |F5 / F7| < 1

[0400] In Equation 53, the relationship between the focal lengths F5 and F7 of the fifth and seventh lenses can be set so that the refractive power and 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| < 0.6.

[0401] [Equation 54] 0 < |F6 / F1| < 2

[0402] In Equation 54, the relationship between the focal lengths F1 and F6 of the first and sixth lenses is set so that the refractive power and optical path of the first spherical lens and the first aspherical lens can be controlled, and the influence of TTL can be controlled to improve the resolution. Equation 54 is preferably satisfied as: 1 < |F6 / F1| < 2.

[0403] [Equation 55] 0 < |F37| / F12 < 3

[0404] In Formula 55, the relationship between the composite focal length F37 of the third to seventh lenses and the composite focal length F12 of the first and second lenses is set, so that the refractive power of the object side lens group and the sensor side lens group of the aperture stop can be controlled to improve the resolution, and a thin and compact size optical system can be provided. Formula 55 preferably satisfies: 0<|F37| / F12<1. Here, F12 is the focal length of the first lens group, F37 may be the focal length of the second lens group, and F37 may have positive refractive power in the first embodiment and may have negative refractive power in the second embodiment.

[0405] [Formula 56] 0 <F37 / F6<1

[0406] In Formula 56, the relationship between the composite focal length F37 of the third to seventh lenses and the focal length F6 of the sixth lens is set so that the combined refractive power of the third to seventh lenses and the refractive power of the first aspherical lens can be adjusted to improve resolution, and a thin and compact-sized optical system can be provided. Formula 56 preferably satisfies: 0<|F37 / F6|<0.8.

[0407] [Formula 57] 0<|F37 / F7|<1

[0408] In Formula 57, the relationship between the composite focal length F37 of the third to seventh lenses and the focal length F7 of the seventh lens is set so that the combined refractive power of the third to seventh lenses and the refractive power of the last aspherical lens can be adjusted to improve resolution, and a thin and compact-sized optical system can be provided. Formula 57 preferably satisfies: 0<|F37 / F7|<0.5.

[0409] [Formula 58] 0 <F6 / F<5

[0410] In Formula 58, the relationship between the focal length F6 of the sixth lens and the effective focal length F is set so that the refractive power of the first aspherical lens and the entire focal length can be adjusted to improve the resolution, and a thin and compact optical system can be provided. Formula 58 preferably satisfies: 1 <F6 / F<3.5。

[0411] [Formula 59] F37 <TTL

[0412] The relationship between the focal length F37 of the second lens group and the total length TTL can be set in Formula 59. TTL can be reduced by the second lens group having an aspherical surface.

[0413] [Formula 60] 1 <nGL / nGM<4

[0414] nGL means the number of spherical lenses, and nGM means the number of aspherical lenses. By setting the number of aspherical lenses in Formula 60 to be greater than 1 times the number of spherical lenses, the thickness of the optical system can be reduced, and a greater refractive power can be provided by the aspherical surface. Formula 60 preferably satisfies: 2 < nGL / nGM < 3.

[0415] [Formula 61] 1 < nSS / nAS < 4

[0416] nSS means the number of lens surfaces having spherical surfaces within the lens cross-section, and nAS means the number of lens surfaces having aspherical surfaces within the lens cross-section. In Formula 61, by setting the number of aspherical lens surfaces to be greater than 1 times the number of spherical lens surfaces, the thickness of the optical system can be reduced and a wider range of refractive power can be provided by the aspherical surface. Formula 60 preferably satisfies: 2 < nSS / nAS < 3.

[0417] [Formula 62] CA3 < CA2 < CA1

[0418] By setting the relationship between the effective diameters CA1, CA2, and CA3 of the first, second, and third lenses, the optical path of the lenses before and after the aperture stop can be controlled, thereby setting the optical path of the entire lens.

[0419] [Formula 63] 0 < ΣGM_CT / ΣGL_CT < 1

[0420] ΣGM_CT is the sum of the center thicknesses of the aspherical lenses, and ΣGL_CT is the sum of the center thicknesses of the spherical lenses. If Formula 62 is satisfied, the relationship between the thickness of the aspherical lenses and the thickness of the spherical lenses with respect to TTL can be set to control the entire TTL. Formula 62 preferably satisfies: 0.1 < ΣGM_CT / ΣGL_CT < 0.5.

[0421] [Formula 64] 10 < TTL < 50

[0422] TTL (Total Track Length) means the distance (mm) from the center of the first surface S1 of the first lens 101 to the surface of the image sensor 300 on the optical axis OA. In Formula 64, TTL can be set to be more than 10 mm or 20 mm, thereby providing a vehicle optical system. Formula 64 preferably satisfies: 22 < TTL < 40 or the following condition TD < TTL.

[0423] [Formula 65] 2 < ImgH

[0424] Formula 65 can set the diagonal size (2 * ImgH) of the image sensor 300 and can provide an optical system with the size of a vehicle sensor. Formula 65 can preferably satisfy: 4 ≤ ImgH.

[0425] [Equation 66] 2 < BFL < 7

[0426] In Equation 66, the back focal length (BFL) is set to be greater than 2 mm and less than 7 mm, thereby ensuring the mounting space for the optical filter 500 and the cover glass 400, improving the assemblability of the components through the gap between the image sensor 300 and the last lens, and improving the bonding reliability. Equation 66 can preferably satisfy: 2.5 ≤ BFL ≤ 3. When BFL is less than the range of Equation 68, part of the light that continues to enter the image sensor may not be transmitted to the image sensor, which may lead to a reduction in resolution. If BFL exceeds the range of Equation 68, stray light may be introduced, which may deteriorate the aberration characteristics of the optical system.

[0427] [Equation 67] 0.1 < BFL / CG2 < 2

[0428] In Equation 67, BFL sets the spacing between the lenses, for example, the center distance CG2 between the second lens and the third lens, thereby ensuring the mounting space for the optical filter 500 and the cover glass 400, and improving the assemblability of the components and the joint reliability through the spacing between the image sensor 300 and the last lens. In Equation 67, the first embodiment satisfies: 0.5 < BFL / CG2 < 1, and the second embodiment satisfies: 1 < BFL / CG1 < 2.5.

[0429] [Equation 68] CG6 < BFL

[0430] In Equation 68, BFL is set to be greater than the spacing between the lenses, for example, the center distance CG6 between the sixth and seventh lenses, such that the mounting space for the optical filter 500 and the cover glass 400 can be ensured, and the assembly of the components can be improved and the bonding reliability can be improved through the spacing between the image sensor 300 and the last lens. In addition, the seventh lens, which is the last lens, can disperse the incident light to the effective area of the image sensor, but if BFL does not satisfy Equation 68, part of the emitted light may not be transmitted to the effective area of the image sensor, thereby reducing the resolution. Here, CG3 and CG5 can be less than BFL.

[0431] [Equation 69] 3 < F < 40

[0432] Equation 69 can set the total effective focal length F to suit the vehicle optical system. Equation 69 can satisfy 10 < F < 30.

[0433] [Equation 70] FOV < 45

[0434] In Formula 70, FOV (Field of View) means the diagonal viewing angle (degrees) of the optical systems 1000 and 1001, and can provide a vehicle optical system of less than 45 degrees. Preferably, FOV can satisfy: 20≤FOV≤40.

[0435] [Formula 71] 1 <TTL / CA_Max<5

[0436] CA_Max means the maximum effective diameter (mm) among the object-side and sensor-side surfaces 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. Formula 71 sets the relationship between the total optical axis length and the maximum effective diameter of the optical system, thereby providing an improved vehicle optical system. Formula 71 preferably satisfies: 1.5 <TTL / CA_Max<4。

[0437] [Formula 72] 2 <TTL / ImgH<15

[0438] Formula 72 can 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 systems 1000 and 1001 according to the present embodiment satisfy Formula 72, the optical systems 1000 and 1001 can have TTL to be applied to the vehicle image sensor 300, thereby providing a more improved image quality. Formula 72 preferably satisfies: 4 <TTL / ImgH≤10。

[0439] [Formula 73] 0.1 <BFL / ImgH<2

[0440] Formula 73 can 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 systems 1000 and 1001 according to the embodiment satisfy Formula 73, the optical systems 1000 and 1001 can ensure a BFL of a size for an applied vehicle image sensor 300, set the distance between the last lens and the image sensor 300, and have good optical characteristics at the center and peripheral portions of the FOV. Formula 73 can preferably satisfy: 0.3 <BFL / ImgH<1。

[0441] [Formula 74] 5 <TTL / BFL<20

[0442] Formula 74 can set the total optical axis length TTL of the optical system and the optical axis distance BFL between the image sensor 300 and the last lens (unit: mm). If the optical systems 1000 and 1001 according to the embodiment satisfy Formula 55, the optical systems 1000 and 1001 can ensure BFL. Formula 74 can preferably satisfy: 8 <TTL / BFL<16。

[0443] [Formula 75] 1 <TTL / F<3

[0444] Formula 75 can set the total focal length F and the total optical axis length TTL of the fixed optical systems 1000 and 1001. Therefore, an optical system for a driver assistance system can be provided. Formula 75 preferably satisfies: 1.5≤TTL / F≤2.8. When the optical systems 1000 and 1001 according to the embodiment satisfy Formula 75, the optical systems 1000 and 1001 can have an appropriate focal length within the set TTL range, and provide an optical system that can maintain an appropriate focal length and form an image even when the temperature changes from a low temperature to a high temperature. When it is less 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 lead to the problem of an imaging lens system becoming larger.

[0445] [Formula 76] 1 <F / BFL<10

[0446] Formula 76 can set the total effective focal length F of the optical systems 1000 and 1001 and the optical axis distance BFL between the image sensor 300 and the last lens. If the optical systems 1000 and 1001 according to the embodiment satisfy Formula 76, the optical systems 1000 and 1001 can have a set field of view and an appropriate focal length, and can provide a vehicle optical system. In addition, the optical systems 1000 and 1001 can minimize the distance between the last lens and the image sensor 300, so that they can have good optical characteristics in the peripheral part of the FOV. Formula 76 can preferably satisfy: 3 <F / BFL<8。

[0447] [Formula 77]1 <F / ImgH<5

[0448] Formula 77 can set the total effective focal length F of the optical systems 1000 and 1001 and the diagonal length ImgH from the optical axis of the image sensor 300. This optical system 1000 and 1001 can have improved aberration characteristics in the size of the vehicle image sensor 300. Formula 77 preferably satisfies: 2 <F / ImgH<4.1。

[0449] [Formula 78]1 <F / EPD<5

[0450] Formula 78 can set the total effective focal length F and entrance pupil diameter of the optical systems 1000 and 1001. Therefore, the overall brightness of the optical system can be controlled. Formula 78 can preferably set: 1 <F / EPD<3。

[0451] [Formula 79] 0 <BFL / TD<0.3

[0452] Equation 79 can set the relationship between the optical axis distance TD of the lenses of the optical systems 1000 and 1001 and the back focal length (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 greater, the BFL is designed to be larger than the TD, so the size of the entire optical system becomes larger, making it difficult to miniaturize the optical system, and the distance between the seventh lens and the image sensor becomes longer, so that unnecessary light quantity may increase between the seventh lens and the image sensor, resulting in problems of reduced resolution such as degradation of aberration characteristics.

[0453] [Equation 80] 0 < EPD / ImgH / FOV < 0.2

[0454] Equation 80 can set the relationship between the entrance pupil diameter (EPD), the length of 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. Equation 80 preferably satisfies: 0 < EPD / ImgH / FOV < 0.1.

[0455] [Equation 81] 5 < FOV / F# < 40

[0456] Equation 81 can set the relationship between the diagonal field of view of the optical system and the F-number. Equation 81 preferably satisfies: 10 < FOV / F# < 30. Here, the F# is provided as 1.8 or less to provide a bright image.

[0457] [Equation 82] 1 < ΣGL_CT / F# < 20

[0458] Equation 82 can set the relationship between the sum ΣGL_CT of the center thicknesses of the glass lenses of the optical system and the F-number F#. Preferably, Equation 82 can satisfy: 10 < ΣGL_CT / F# < 15.

[0459] [Equation 83] 1 < ΣGM_CT / F# < 10

[0460] Equation 83 can set the relationship between the sum ΣGM_CT of the center thicknesses of the aspherical lenses of the optical system and the F-number F#. Equation 83 preferably satisfies: 1 < ΣPL_CT / F# < 5.

[0461] [Equation 84] 1 < ΣGL_Index / F# < 10

[0462] Equation 84 can set the relationship between the sum ΣGL_Index of the refractive indices of the spherical lenses of the optical system and the F-number F#. Equation 84 preferably satisfies: 3 < ΣGL_Index / F# < 8.

[0463] [Formula 85] 1<ΣGM_Index / F#<10

[0464] Formula 84 can set the relationship between the sum of the refractive indices ΣGL_Index of the aspherical lenses of the optical system and the F number F#. Formula 84 can preferably satisfy: 1<ΣGL_Index / F#<5.

[0465] [Formula 86]|Max_Sag62|<|Max_Sag52|

[0466] Max_Sag62 is the maximum distance in the optical axis direction from the straight line perpendicular to the optical axis on the sensor side surface of the sixth lens to the sensor side surface of the sixth lens, and Max_Sag52 is the maximum distance in the optical axis direction from the straight line perpendicular to the optical axis on the sensor side surface of the fifth lens to the sensor side surface of the fifth lens. When Formula 86 is satisfied, light can be guided from the last spherical lens to the first aspherical 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 controlled.

[0467] [Formula 87]|Max_Sag72|<|Max_Sag62|

[0468] Max_Sag62 is the maximum distance from the 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 Formula 87 is satisfied, light can be guided from the aspherical 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 and seventh lenses can be controlled.

[0469] [Formula 87-1]

[0470] |Max_Sag52|<|Max_Sag41|

[0471] |Max_Sag62|<|Max_Sag61|

[0472] |Max_Sag72|<|Max_Sag71|

[0473] Formula 87-1 can satisfy at least one of the formulas.

[0474] Max_Sag41 is the maximum distance in the optical axis direction from the straight line perpendicular to the optical axis on the object-side surface of the fourth lens to the object-side surface of the fourth lens. Max_Sag52 is the maximum distance in the optical axis direction from the straight line perpendicular to the optical axis on the sensor-side surface of the fifth lens to the sensor-side surface of the fifth lens. Max_Sag71 is the maximum distance in the optical axis direction from the straight line perpendicular to the optical axis on the object-side surface of the seventh lens to the object-side surface of the seventh lens.

[0475] [Formula 88]

[0476]

[0477] In Formula 93, Z may mean Sag, 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 a direction perpendicular to the optical axis. c may mean the curvature of the lens, and K may mean the conic constant. In addition, A, B, C, D, E, and F may mean aspherical coefficients.

[0478] The optical systems 1000 and 1001 according to the embodiments may satisfy at least one or two or more of formulas 1 to 44. At least one or more of formulas 1 to 44 may satisfy at least one or more of formulas 45 to 87. In this case, the optical systems 1000 and 1001 may have improved optical characteristics. Specifically, when the optical systems 1000 and 1001 satisfy at least one of formulas 1 to 44 and / or at least one of formulas 45 to 87, the optical systems 1000 and 1001 may have improved resolution and may improve aberration and distortion characteristics. In addition, the optical systems 1000 and 1001 may ensure the BFL (back focal length) for applying the vehicle image sensor 300, compensate for the degradation of optical characteristics due to temperature changes, and minimize the gap between the last lens and the image sensor 300, thereby having good optical performance in the center and peripheral portions of the FOV.

[0479] Table 2 shows the items of the above formula in the optical systems 1000 and 1001 of the embodiments, including TTL (mm), BFL, effective focal length F (mm), ImgH (mm), effective diameter CA (mm), thickness (mm), TTL (mm), TD (mm) (as the optical axis distance from the first surface S1 to the fourteenth surface S14) of the optical systems 1000 and 1001, the focal length F1, F2, F3, F4, F5, F6, and F7 (mm) of each of the first to seventh lenses, the sum of refractive indices, the sum of Abbe numbers, the sum of thicknesses (mm), the sum of distances between adjacent lenses, effective diameter characteristics, diagonal FOV (degrees), edge thickness ET, focal lengths of the first and second lens groups, F-numbers, and the like.

[0480]

Table 2

[0481]

[0482] Table 3 shows the result values ​​of the above formulas 1 to 44 in the optical systems 1000 and 1001 of this embodiment. Referring to Table 3, it can be seen that the optical systems 1000 and 1001 satisfy at least one, two or more, or three or more of formulas 1 to 44. In detail, it can be seen that the optical systems 1000 and 1001 according to this embodiment satisfy all of formulas 1 to 44. Therefore, the optical systems 1000 and 1001 can have good optical performance at the center and periphery of the field of view (FOV), and can have excellent optical characteristics.

[0483]

Table 3

[0484]

[0485] Table 4 shows the results of the above-mentioned formulas 45 to 87 in the optical systems 1000 and 1001 of the embodiment. Referring to Table 4, it can be seen that the optical systems 1000 and 1001 satisfy at least one, two or more, or three or more of formulas 45 to 87. In detail, it can be seen that the optical systems 1000 and 1001 according to the embodiment satisfy all of formulas 1 to 87. Therefore, the optical systems 1000 and 1001 can have good optical performance and excellent optical characteristics at the center and peripheral portions of the FOV.

[0486]

Table 4

[0487]

[0488] <Third Embodiment>

[0489] Fig.21 is an example of a side cross-sectional view of a camera module according to a third embodiment of the present invention, Fig. 22 It is shown Fig.21 FIG. 1 is a diagram of a sensor side area of ​​a first lens barrel in a camera module, Fig.23 is the explanation Fig. 22 FIG. 1 is a diagram of a combination of a second lens barrel and a sensor side lens of a camera module, Fig.24 is the explanation Fig. 22 The second lens tube diagram, Fig.25 (A) (B) is the combination of lenses Fig. 22 An example of the second lens barrel, Fig.26 yes Fig.21 Another example of a second lens barrel in a camera module of Fig. 27 1 is a diagram for explaining a gap G1 between the outermost side of the second lens barrel and the inner side of the first lens barrel in a camera module according to a third embodiment of the present invention, Fig.28 1 is a diagram for explaining a gap G2 between an object-side surface of a second lens barrel and a sensor-side lens having a material different from that of the second lens barrel in a camera module according to a third embodiment of the present invention, Fig.29 is a diagram for explaining a gap G3 between an outer surface of a second lens barrel and a first lens barrel in a camera module according to a third embodiment of the present invention, and Fig.30 and Fig.31 is the explanation Fig.21 Figure 2 shows the connection process of the camera module.

[0490] refer to Figure 21 to Figure 25 , the camera module 1002 according to the third embodiment of the present invention may include a lens portion 200 having a plurality of lenses, a first lens barrel 230 in which a plurality of lenses are stacked, a second lens barrel 240 on the inner side of the first lens barrel 230, and at least one gap maintaining member arranged on the outer side between the plurality of lenses. The second lens barrel 240 may penetrate from the upper part to the lower part. It may include a cover 250 coupled to the upper side of the first lens barrel 230. The gap maintaining member may maintain a gap between two adjacent lenses and may be used as a light shielding member, a spacer, or a spacing member.

[0491] The annular member 291 may be arranged around the first lens barrel 230 and the first lens. The annular member 291 may be made of an elastic material or a resin material such as silicone or epoxy. As another example, the annular member 291 may be coupled between the first lens barrel 230 and the cover. The annular member 291 may perform waterproof and dustproof functions on the inside and / or outside of the first lens barrel 230.

[0492] The camera module 1002 may include a substrate 210 and an image sensor 212 disposed on the sensor side of the lens portion 200 (ie, on the sensor side of the last lens). The camera module 1002 may include a cover glass 214 and an optical filter 216 between the last lens of the lens portion 200 and the image sensor 212.

[0493] The image sensor 212 may be disposed on the substrate 210. The substrate 210 may be mounted, placed, contacted, fixed, temporarily fixed, supported, or coupled to the image sensor 212 on a plane intersecting the optical axis Z0. Alternatively, according to another embodiment, a groove or hole (not shown) capable of accommodating the image sensor 212 may be formed in the substrate 210, and the embodiment is not limited to a specific form in which the image sensor 212 is disposed on the substrate 210. The substrate 210 may be a rigid PCB or an FPCB. The image sensor 212 may perform a function of converting light passing through the lens portion 200 into image data. The image sensor 212 may be any one of a CCD (charge coupled device) or a CMOS (complementary metal oxide semiconductor), a CPD, or a CID. When the image sensor 212 is multiple, one of them may be a color (RGB) sensor and the other may be a black and white sensor.

[0494] The optical filter 216 may be disposed between the lens portion 200 and the image sensor 212. The optical filter 216 may filter light corresponding to a specific wavelength range of light for passing through the lenses 201-207. The optical filter 216 may be an infrared (IR) blocking filter that blocks infrared rays or an ultraviolet (UV) blocking filter that blocks ultraviolet rays, but the embodiment is not limited thereto. The optical filter 216 may be disposed on the image sensor 212. The cover glass 214 is disposed between the optical filter 216 and the image sensor 212, and may protect the upper portion of the image sensor 212 and prevent the reliability of the image sensor 212 from being degraded.

[0495] The lens portion 200 may include an optical system in which five or more lenses are laminated, or an optical system in which nine or fewer lenses are laminated. The lens portion 200 may include six to eight solid lenses. The lens portion 200 may include lenses of different materials, for example, lenses made of plastic and lenses made of glass. For example, the lens portion 200 may include one or more plastic lenses and two or more glass lenses. The ratio of the number of lenses made of plastic to the number of lenses made of glass may be 1:2 to 1:4. The number of lenses made of glass may be more or less than the number of lenses made of plastic.

[0496] In the lens portion 200 according to the third embodiment of the present invention, the number of lenses made of glass may be two or more than the number of lenses made of plastic. Here, the lens portion 200 may be laminated with a plastic lens or / and a glass lens. Here, the linear thermal expansion coefficient (CTE) of the plastic material is higher than that of the glass material, for example, 5 times higher, and the change value of the refractive index as a function of temperature can be higher than that of the glass material, for example, 10 times higher. However, because lenses made of plastic materials are easier to manufacture and design than lenses made of glass materials, the demand for their use is increasing.

[0497] In the camera module 1002, 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. Preferably, the lens with the largest effective diameter may be made of glass. The effective diameter may be the diameter of the effective area where effective light is incident on each lens. The effective diameter is the average of the effective diameter of the object side surface and the effective diameter of the sensor side surface of each lens. The third embodiment of the present invention reduces the weight of the camera module by further mixing plastic lenses into the camera module 1002, can provide lower manufacturing costs, can suppress degradation of optical characteristics due to temperature changes, various types of plastic lenses can replace glass lenses, and can facilitate polishing and processing of lens surfaces such as aspheric surfaces or free-form surfaces.

[0498] The first lens barrel 230 has a hole 235 extending from the upper part to the lower part, and a plurality of lenses are combined into the hole, and the plurality of lenses can be combined through the upper opening of the first lens barrel 230 or the opening 251 of the cover 250. Fig.30 and 31 As shown in , a plurality of lenses can be stacked sequentially from the lens 207 closest to the sensor side to the lens 201 closest to the object side. As another example, the lenses can be combined from the sensor side toward the object side, or can be combined in both directions. The lens closest to the object side can be the first lens 201, and the sensor side lens closest to the optical filter 216 or the image sensor 212 can be the nth lens or the last lens 207, and n can be an integer greater than or equal to 5, for example, one of 6, 7, and 8.

[0499] The lens portion 200 may have a plurality of lenses aligned along the optical axis OA from the object side toward the image sensor 212, for example, the first lens 201, the second lens 202, the third lens 203, the fourth lens 204, the fifth lens 105, the sixth lens 106, and the seventh lens 207 may be aligned. The second lens 202 may be disposed between the first lens 201 and the third lens 203. The fourth lens 204 may be disposed between the third lens 203 and the fifth lens 205, and the sixth lens 206 may be disposed between the fifth lens 205 and the seventh lens 207. The camera module 1002 according to the third embodiment may include an aperture stop (for example, 221). The aperture stop can control the amount of light incident on the optical system 1002. The aperture stop can be arranged at a set position. For example, the aperture stop may be acted by a first spacer 221 disposed around the periphery between the first lens 201 and the second lens 202, or a light shielding material coated on the surface of the first spacer 221. Alternatively, a light shielding material may be coated around the periphery of the sensor-side surface of the first lens 201 or the periphery of the object-side surface of the second lens 202 to function as an aperture stop for controlling the amount of light.

[0500] The first spacer 221 is disposed around the periphery of the first lens 201 and the second lens 202, and can maintain a gap between the first lens 201 and the second lens 202. The outer surface of the first spacer 221 can contact the inner surface of the first lens barrel 230, and can be provided in a ring shape. The first spacer 221 can be made of a metal material or a non-metal material, and can be formed of an aluminum material or a plastic material, for example.

[0501] For convenience of explanation, the present invention will be described with seven lenses, and the lenses 201-207 in the first lens barrel 230 will be described as being coupled from the sensor side toward the object side. The lens portion 200 may include any one of the lenses in the first and second embodiments inside the first lens barrel 230. In addition, the second lens barrel 240 may have the last lens in the first and second embodiments arranged inside it, or the sixth and seventh lenses coupled thereto.

[0502] The first lens 201 may have a positive (+) or negative (-) refractive power on the optical axis OA. The first lens 201 may have a negative (-) refractive power. The first lens is arranged closest to the object side among the lenses, and may have, for example, a convex object side surface and a concave sensor side surface on the optical axis. Because the object side surface of the first lens has a convex shape on the optical axis, the problem of accumulation of external foreign matter or dust can be suppressed. In addition, the first lens can be formed of a repair material. The first lens can be provided in an injection-molded shape made of glass, and the object side surface and the sensor side surface may be aspherical.

[0503] The first lens 201 made of glass can reduce the change of the center position and the curvature radius due to the temperature change of the surrounding environment, and can protect the incident side surface of the optical system 1002. In addition, the flange portion 201A of the first lens 201 can have a flat object side surface, and the flat surface can block foreign matter from entering from the outside. In addition, since the first lens 201 is made of a molded material, the sealing force with the cover 250 can be improved. The cover 250 is coupled to the upper circumference of the flange portion 201A of the first lens 201, and the cover 250 can be coupled to the upper circumference of the first lens barrel 230.

[0504] The second lens 202 may have positive (+) or negative (-) refractive power on the optical axis OA. The second lens 202 may have positive (+) refractive power. For example, the second lens may have a concave object-side surface and a convex sensor-side surface on the optical axis. On the contrary, the second lens 202 may have a convex meniscus shape toward the object side or a concave shape on both sides. The second lens may be formed of a plastic material or a glass material, for example, may be formed of a glass material.

[0505] The third lens 203 may have positive (+) or negative (-) refractive power on the optical axis OA. The third lens 203 may have positive (+) refractive power. The third lens may have, for example, a convex object-side surface and a convex sensor-side surface on the optical axis. On the contrary, the third lens 203 may have a convex meniscus shape toward the sensor side or a concave shape on both sides. The third lens 203 may be formed of a plastic material or a glass material, for example, may be formed of a glass material.

[0506] The fourth lens 204 may have positive (+) or negative (-) refractive power on the optical axis OA. The fourth lens 204 may have positive (+) refractive power. The fourth lens may have, for example, a convex object-side surface and a concave sensor-side surface on the optical axis. Alternatively, the fourth lens 204 may have a meniscus shape convex toward the sensor side or a shape concave on both sides. The fourth lens 204 may be formed of a plastic material or a glass material, for example, may be formed of a glass material.

[0507] The fifth lens 205 may have a positive (+) or negative (-) refractive power on the optical axis OA. The fifth lens 205 may have a negative (-) refractive power. The fifth lens 205 may include a plastic or glass material. For example, the fifth lens 205 may be provided by a glass material. The fifth lens 205 may have, for example, a convex object-side surface and a concave sensor-side surface on the optical axis. Alternatively, the fifth lens 205 may have a meniscus shape convex toward the sensor side or a shape concave on both sides.

[0508] The fourth lens 204 and the fifth lens 205 may be bonded. The sensor side surface of the fourth lens 204 and the object side surface of the fifth lens 205 may be bonded. The fourth lens 204 and the fifth lens 205 may have opposite refractive powers. The combined refractive power of the fourth lens 204 and the fifth lens 205 may have positive refractive power. The product of the refractive power of the object side lens of the cemented lens and the refractive power of the sensor side lens may be less than 0. The product of the focal length of the object side lens of the cemented lens and the focal length of the sensor side lens may be less than 0. Therefore, the aberration characteristics of the optical system can be improved. If the refractive power of the two lenses of the cemented lens is the same, there is a limit to the improvement of the aberration. The combined refractive power of the cemented lens has positive refractive power, and the object side third lens 203 and the sensor side sixth lens 206 based on the cemented lens can have positive refractive power. Therefore, the third lens 203, the cemented lens, and the sixth lens 206 can refract part of the incident light in the direction of the optical axis.

[0509] The diameter of the fifth lens 205 may be greater than that of the fourth lens 204 , and an outer surface of the fourth lens 204 may be spaced apart from an inner surface of the first lens barrel 230 , and an outer surface of a flange portion 205A of the fifth lens 205 may contact the inner surface of the first lens barrel 230 .

[0510] The sixth lens 206 may have a positive (+) or negative (-) refractive power on the optical axis OA. The sixth lens 206 may have a positive (+) refractive power. The sixth lens 206 may include a plastic or glass material. For example, the sixth lens 206 may be provided as a plastic material. The sixth lens 206 may have a convex object-side surface and a convex sensor-side surface on the optical axis. As another example, the sixth lens 206 may have a meniscus shape convex toward the object side, a meniscus shape convex toward the sensor side, or a biconcave shape.

[0511] The seventh lens 207 may have a positive (+) or negative (-) refractive power on the optical axis OA. The seventh lens 207 may have a negative (-) refractive power. The seventh lens 207 may include a plastic or glass material. For example, the seventh lens 207 may be a plastic material. The seventh lens 207 may have a meniscus shape convex toward the object side on the optical axis. Alternatively, the seventh lens 207 may have a meniscus shape convex toward the sensor side on the optical axis OA or a biconcave shape.

[0512] The seventh lens 207 can be a plastic lens closest to the image sensor 230. By arranging the plastic lens closest to the image sensor 212, it is possible to improve the optical performance by having a lens surface with an aspherical surface, thereby controlling the influence on the aberration characteristics and resolution. In addition, by arranging the plastic lens closest to the image sensor 212, the lens can be insensitive to assembly tolerances compared to glass lenses. In other words, insensitivity to assembly tolerances means that even if the assembly is slightly different from the design during assembly, the optical performance will not be significantly affected. Here, the glass lens can be defined as a first lens group, and the plastic lens can be defined as a second lens group. The optical axis distance of the first lens group is the optical axis distance from the object side surface of the first lens 201 to the sensor side surface of the fifth lens 205, and the optical axis distance of the second lens group is the optical axis distance from the object side surface of the sixth lens 206 to the sensor side surface of the seventh lens 207.

[0513] The second spacer 222 is a member that maintains a gap between the flange portions 202A and 203A of the second lens and the third lens 202 and 203. The second spacer 222 may be made of a metal or non-metal material, for example, aluminum or copper, or plastic. The inner protrusion P11 of the second spacer 222 may be fitted into a step portion formed around the convex sensor side surface of the second lens 202. The third spacer 223 may maintain a gap between the flange portions 203A and 205A of the third lens 203 and the fifth lens 205. The third spacer 223 may maintain a gap between the third lens 203 and the cemented lens. The third spacer 223 may be made of a metal or non-metal material, for example, aluminum or copper, or plastic. The third spacer 22 is arranged between the outer surface of the fourth lens 204 and the inner surface of the first lens barrel 230, and the inner protrusion P12 of the third spacer 223 may support the periphery of the convex object side surface of the fourth lens 204.

[0514] When the second spacer 222 and the third spacer 223 are made of metal material, they can conduct the heat transferred from the inner lens to the first lens barrel 230. That is, they can dissipate the heat conducted by the flange portion of the glass lens. When the spacers 221, 222 and 223 are made of metal material, they can include at least one of In, Ga, Zn, Sn, Al, Ca, Sr, Ba, W, U, Ni, Cu, Hg, Pb, Bi, Si, Ta, H, Fe, Co, Cr, Mn, Be, B, Mg, Nb, Mo, Cd, Sn, Zr, Sc, Ti, V, Eu, Gd, Er, Lu, Yb, Ru, Y and La. The oxide film can be an oxide material processed with black oxide or brown oxide using copper. Here, the first lens barrel 230 can be made of metal or non-metal material, and can be, for example, made of aluminum or copper. Therefore, if the first lens barrel 230 is made of a metal material, it is possible to dissipate the heat generated from the spacers 221, 222, and 223 and the flange portion of each lens, thereby preventing the reliability of the optical characteristics from being reduced due to the temperature change of the camera module exposed to the outside. The first lens barrel 230 may have an upper diameter X1 of the inner portion greater than the lower diameter X2. Here, the upper diameter X1 may be the maximum distance of the area facing the outer surface of the flange portion 201A of the first lens 201. The lower diameter X2 may be the maximum distance of the area facing the outer surface of the flange portion 207A of the last lens 207.

[0515] In the third embodiment of the present invention, the second lens barrel 240 can be combined in the first lens barrel 230. Each of the first lens barrel 230 and the second lens barrel 240 can have at least one different lens on the inside. Here, the inside of the first lens barrel 230 can contact the outer surface of at least two or more lenses. The inside of the second lens barrel 240 can contact the outer surface of at least one or more lenses. The second lens barrel 240 can be an inner lens barrel arranged on a part of the inside of the first lens barrel 230. For example, the second lens barrel 240 can be arranged on the sensor side rather than the object side among the internal area of ​​the first lens barrel 230. The second lens barrel 240 can be arranged on the closest sensor side among the internal area of ​​the first lens barrel 230. The second lens barrel 240 can be arranged on the lower locking protrusion 234 of the first lens barrel 230. The second lens barrel 240 can be arranged on the outer periphery of the lower opening 233 of the first lens barrel 230.

[0516] The first lens barrel 230 may be formed of a first material, and the second lens barrel 240 may be formed of a second material. The first lens barrel 230 and the second lens barrel 240 may be made of different materials. The first lens barrel 230 and the second lens barrel 240 may have different thermal expansion coefficients. The second lens barrel 240 may be made of a material having a thermal expansion coefficient greater than that of the first lens barrel 230. For example, the first lens barrel 230 may be made of a metal, such as aluminum, and the second lens barrel 240 may be made of a non-metal, such as a resin or plastic. The first lens barrel 230 may have a thermal expansion coefficient less than 30, and the second lens barrel 240 may have a thermal expansion coefficient of 50 or more. The thermal expansion coefficient difference between the first lens barrel 230 and the second lens barrel 240 may be 20 or more. The second lens barrel 240 may have a thermal expansion coefficient difference of 3 or less or 2 or less or the same as the thermal expansion coefficient of a plastic lens.

[0517] The height Z12 of the second lens barrel 240 may be less than 50% or 40% or less of the height of the first lens barrel 230. The height Z12 of the second lens barrel 240 may be greater than the center thickness of the plastic lens or the optical axis distance of the second lens group. The height Z12 of the second lens barrel 240 may be greater than the sum of the center thickness of the plastic lens and the center distance of the plastic lens. For example, the height Z12 of the second lens barrel 240 may be greater than the center thickness of the sixth lens 206 and the seventh lens 207, for example, greater than the sum of the center thickness of the sixth lens 206 and the seventh lens 207 and the center distance between the sixth lens 206 and the seventh lens 207. The height Z12 of the second lens barrel 240 may be higher than the upper end height Z11 of the flange portion 206A of the sixth lens 206. The height Z12 of the second lens barrel 240 may be less than the optical axis distance of the first lens group and greater than the optical axis distance of the second lens group. The height Z12 of the second lens barrel 240 may be less than the optical axis distance from the center of the object side surface of the fifth lens 205 to the center of the sensor side surface of the seventh lens 207. The height Z12 of the second lens barrel 240 can be greater than the optical axis distance of the two lenses adjacent to the image sensor, and less than the optical axis distance of the three lenses. The height Z12 of the second lens barrel 240 can be 5mm or greater, for example, in the range of 5mm to 20mm or 10mm to 20mm. If the height Z12 of the second lens barrel 240 exceeds this range, the camera module may become larger or cover the outer surface of the glass lens, which may cause problems caused by temperature changes. If it is less than this range, the plastic lenses 206 and 207 may not be fully covered, or it may be difficult to guide the lower edge of the fifth lens 205 to be aligned on the sixth lens 206. The height of the first lens barrel 230 is the height from the lower end to the upper end of the first lens barrel 230 in the optical axis direction.

[0518] The lenses contacting the inner surface of the second lens barrel 240 may be three or four or more lenses made of glass. For example, the lenses contacting the inner surface of the second lens barrel 240 may be the first lens to the third lens. The outer surface of the flange portion 205A of the fifth lens 205 may contact the inner surface of the second lens barrel 240. The lenses contacting the inner surface of the first lens barrel 230 may be one or more lenses. For example, the lenses contacting the inner surface of the first lens barrel 230 may be the sixth lens and the seventh lens. The outer surface of the support portion 205B of the fifth lens 205 may contact the inner surface of the first lens barrel 230.

[0519] The fifth lens 205 may contact the inner surface of the first lens barrel 230 and the inner surface of the second lens barrel 240. The outer surface of the flange portion 205A of the fifth lens 205 may contact the inner surface of the first lens barrel 230, and the outer surface of the support portion 205B of the lower circumference may contact the inner surface of the second lens barrel 240. The outer surface of the flange portion of the cemented lens may contact the outer surface of the first lens barrel 230, and the outer surface of the support portion 205B mounted on the sixth lens 206 may contact the outer surface of the second lens barrel 240. The first lens barrel 230 and the second lens barrel 240 may contact lenses of different materials. For example, the inner surface 231 of the first lens barrel 230 may contact the outer surface of a lens made of glass. The inner surface 45 of the second lens barrel 240 may contact the outer surface of a lens made of plastic. The inner surface 45 of the second lens barrel 240 may contact the outer surfaces of the flange portions 206A and 207A of the sixth and seventh lenses 206 and 207. An upper portion of the inner surface 45 of the second lens barrel 240 may be in contact with an outer surface of the supporting portion 205B of the fifth lens 205 .

[0520] The material of the second lens barrel 240 and the material of the sixth lens 206 and the seventh lens 207 can be the same material, for example, a plastic material. Plastic materials expand more than aluminum materials at high temperatures (85 degrees or higher), and plastic materials can shrink less than aluminum materials at low temperatures (i.e., -40 degrees or lower). Therefore, when the sixth lens 206 and the seventh lens 207 expand or shrink according to temperature changes, the second lens barrel 240 can suppress the center misalignment of the sixth lens 206 and the seventh lens 207 by expansion or contraction. In other words, the second lens barrel 240 can minimize the stress and centrifugal force of the plastic lens according to temperature changes. In addition, because the second lens barrel 240 and the sixth and seventh lenses 206 and 207 have the same thermal expansion coefficient, the second lens barrel 240 can flow together to minimize the stress generated when the plastic lens expands at high temperatures, and can minimize the centrifugal force generated when the glass lens shrinks at low temperatures. This camera module 1002 can minimize the change in resolution according to temperature changes.

[0521] The diameters of the sixth lens 206 and the seventh lens 207 of the plastic material are smaller than the diameters of the first, second, third and fifth lenses 201, 202, 203 and 205 of the glass material. The sixth lens 206 and the seventh lens 207 can reduce the amount of expansion due to temperature change by designing the flange length to be shorter. More specifically, the amount of expansion in the direction perpendicular to the optical axis can be reduced. The linear expansion coefficients of the glass material and the plastic material are different. At high temperatures, the expansion of the plastic material lens is greater than that of the glass material lens. Therefore, by designing the diameter of the plastic material lens to be shorter than that of the glass material lens, the expansion amounts of the two different materials under the same temperature change can be adjusted to be similar or the same. More specifically, the diameter length of the plastic material lens and the diameter length of the glass material lens can be made similar or the same after expansion at high temperatures.

[0522] like Fig. 22 As shown in , the lower inner diameter (i.e., the minimum inner diameter) of the second lens barrel 240 may be the same as the diameter of the seventh lens 207, which is the last lens. The inner diameter of the center of the second lens barrel 240 may be the same as the outer diameter of the sixth lens 206, which is the lens between the last lens 207 and the fifth lens 205 made of glass. The outer diameter of the seventh lens 207 may be smaller than the outer diameter of the sixth lens 206. Here, the outer diameters of the sixth lens 206 and the seventh lens 207 are the outer diameters of the flange portions 206A and 207A. The upper inner diameter of the second lens barrel 240 may be larger than the outer diameter of the sixth lens 206 and the same as the outer diameter of the support portion 205B of the fifth lens 205. Here, the support portion 205B of the fifth lens 205 has a leg shape and contacts the lower plastic lens 206, so that when the temperature changes, the glass lens 205 can fix the plastic lens 206, thereby suppressing the expansion of the plastic lens 206 and aligning the centers of the fifth lens 205 and the sixth lens 206.

[0523] Here, if Fig.25 As shown in (A) and (B), the second lens barrel 240 can guide the periphery of the support portion 205B of the fifth lens 205 so that it can be bonded inwardly after the seventh lens 207 is laminated and the sixth lens 206 is laminated on the seventh lens 207. Therefore, the support portion 205B of the fifth lens 205 can be inserted into the upper inner side of the second lens barrel 240 and laminated on the flange portion 206A of the sixth lens 206. By bonding the upper portion of the second lens barrel 240 to the outer side of the support portion 205B of the fifth lens 205, the area between the second lens barrel 240 and the support portion 205B can be used as a structure for assembling the support portion 205B of the fifth lens 205.

[0524] like Fig.24As shown in, the inner surface of the second lens barrel 240 may include a first vertical contact portion F1 for surface contact with the outer surface of the flange portion 207A of the seventh lens 207, a second vertical contact portion F3 for surface contact with the outer surface of the flange portion 206A of the sixth lens 206, and a third vertical contact portion F5 for surface contact with the outer surface of the support portion 205B of the fifth lens 205. The inner diameters of the first to third contact portions F1, F3 and F5 may have a relationship of first contact portion < second contact portion < third contact portion. The inner surface of the second lens barrel 240 may include a first non-contact portion F2 extending between the first contact portion F1 and the second contact portion F3, and a second non-contact portion F4 extending between the second contact portion F3 and the third contact portion F5. The first non-contact portion F2 may include an area tilted in a direction away from the optical axis from the first contact portion F1 toward the second contact portion F2. The second non-contact portion F4 may include an area tilted in a direction away from the optical axis from the second contact portion F3 toward the third contact portion F5. As Fig.23 As shown in, the outer surface of the second lens barrel 240 may have an inclined surface relative to the vertical straight line Z1 opposite to the first non-contact portion F2, the second contact portion F3, and the second non-contact portion F4, and the angle R1 of the inclined surface may be 5 degrees or less. The vertical straight line Z1 may be parallel to the straight line Z2 passing through the upper end and the lower end of the outer surface of the second lens barrel 240, and is separated from the inner surface 231 of the first lens barrel 230 by a predetermined distance G0. The outer side between the upper end and the lower end of the second lens barrel 240 may include a space area 245 having a distance G0 from the inner surface 231 of the first lens barrel 230.

[0525] The lower end of the second lens barrel 240 may contact the inner lower end of the first lens barrel 230. For example, the second lens barrel 240 may include a lower protrusion 42 and an outer protrusion 41. The lower protrusion 42 may be seated on a locking protrusion 234 extending in the optical axis direction from the lower end of the first lens barrel 230 at the lower end of the second lens barrel 240. The concave lower groove 42A is arranged on the inner circumference of the lower protrusion 42 so as to prevent the problem of interfering with the engagement of the lens due to a structure such as burrs generated during injection. The lower protrusion 42 may contact the lower end of the second lens barrel 240 by at least 0.2 mm or more so as to support the lower end of the second lens barrel 240. The outer protrusion 41 of the second lens barrel 240 may be spaced apart from the inner surface of the first lens barrel 230 and may be spaced apart from the inner surface 231 of the first lens barrel 230 by an internal lens. The outer protrusion 41 may protrude outward from the upper portion of the second lens barrel 240, and may overlap the support portion 205B of the fifth lens 205 in the horizontal direction. The upper end of the second lens barrel 240 may be spaced apart from the lower surface of the flange portion 205A of the fifth lens 205, and may be spaced apart by a certain distance so that the second lens barrel 240 and the fifth lens 205 do not contact each other even when the plastic lens expands at high temperature. The outer protrusion 41 of the second lens barrel 240 has a concave upper groove 41A on the inner circumference, and the upper groove 41A may prevent the problem of interfering with the bonding with the fifth lens 205 due to a structure such as burrs generated during injection.

[0526] If in a comparative example in which the material of the second lens barrel 240 is plastic and the sixth lens 206 and the seventh lens 207 are plastic, and in an embodiment in which the material of the second lens barrel 240 is aluminum and the sixth lens 206 and the seventh lens 207 are plastic, in the comparative example, when the second lens barrel 240 is plastic, the sixth lens 206 and the seventh lens 207 flow or expand in the horizontal direction or / and the vertical direction when expanding, so that it is possible to reduce the stress transmitted to the sixth lens 206 and the seventh lens 207. In an embodiment, if the second lens barrel 240 is made of metal such as aluminum, even if the sixth lens 206 and the seventh lens 207 are expanded, the second lens barrel 240 is supported at a fixed position, so that the stress transmitted to the sixth lens 206 and the seventh lens 207 can be increased.

[0527] refer to Figure 27 to Figure 29 , the upper outer protrusion 41 of the second lens barrel 240 may be separated from the inner surface 231 of the first lens barrel 230 by a first gap G1. The upper end of the second lens barrel 240 may be separated from the lower surface of the flange portion 205A of the fifth lens 205 by a second gap G2. The lower protrusion 42 of the second lens barrel 240 may be separated from the outer surface 231 of the first lens barrel 230 by a third gap G3. Here, the lower protrusion 42 of the second lens barrel 240 may extend downward in an outward step, or as Fig.26As shown in , it can have an outer surface with an inclined surface and can extend toward the sensor side. The first gap G1 is the distance that the plastic lens can flow when it expands in the horizontal direction, and can be 0.1mm or less, for example, in the range of 0.05mm to 0.1mm. The first gap G1 can be the maximum gap when the first lens barrel 230 and the sixth lens 206 and the seventh lens 207 are made of plastic material and can expand when thermally expanded in the horizontal direction at high temperature, that is, in the range of 85 degrees to 205 degrees. The horizontal direction can be a direction orthogonal to the optical axis. The second gap G2 is the distance that the plastic lens can flow when it expands in the vertical direction, and can be 0.2mm or less, for example, in the range of 0.1mm to 0.2mm. This second gap G2 can be the maximum distance that the second lens barrel 240 and the sixth lens 206 and the seventh lens 207 are made of plastic and can expand and be thermally expanded in the vertical direction at high temperature, that is, in the range of 85 degrees to 105 degrees. The vertical direction can be the optical axis direction. The third gap G3 may be greater than the first gap G1 and may be a distance for facilitating assembly of the second lens barrel 240. The third gap G3 may be a distance from the middle or bottom of the second lens barrel 240 to the inner surface 231 of the first lens barrel 230, and may be less than or equal to the thickness of the second lens barrel 240, for example, 10% to 50% of the thickness of the second lens barrel 240. The thickness of the second lens barrel 240 is a thickness in the horizontal direction at the middle portion.

[0528] refer to Figure 27 to Figure 29 , the first gap G1 is the distance between the inner diameter of the first lens barrel 230 and the maximum outer diameter of the second lens barrel 240, and may be the minimum value in the first direction X and the second direction Y. The second gap G2 is the distance between the upper height of the second lens barrel 240 and the lower surface of the flange portion 205A of the fifth lens 205, and may be the maximum separation distance in the optical axis direction. The third gap G3 is the distance between the inner diameter of the first lens barrel 230 and the lower outer diameter (minimum outer diameter) of the second lens barrel 240, and may be the separation distance in the first direction X and the second direction Y.

[0529] The first to third gaps G1, G2 and G3 can be set as follows within the range of room temperature (10 degrees to 40 degrees), high temperature and low temperature. C1: coefficient of thermal expansion (CTE) of the second barrel made of plastic (PC), C2: coefficient of thermal expansion of the first barrel made of aluminum, T1: tolerance of the second barrel, T2: tolerance of the first barrel, T3: stacking tolerance of the sixth / seventh lens and the fifth lens, D1: outer diameter of the second barrel, i.e., maximum outer diameter, D2: inner diameter of the first barrel, D3: minimum outer diameter of the second barrel, H1: height of the second barrel (Z axis), H2: height of the fifth lens (Z axis).

[0530] The first gap G1 can be initially set as shown in Table 5 at room temperature (25 degrees).

[0531]

Table 5

[0532]

[0533] Under the conditions of the following formula, the first gap G1 can be calculated as shown in Table 6, where at a high temperature (+ΔT), for example, 85° C., the outer diameter change D1 of the second barrel and the inner diameter change D2′ of the first barrel are as follows:

[0534]

Table 6

[0535]

[0536] In the formula, the resulting value of G1 may be greater than 0, and if it is less than 0, a blocking phenomenon may occur between the two barrels. The first gap G1 can be calculated under the conditions of the formula in Table 7 below, such as at a low temperature (-ΔT), for example, -65°C, a change D1' in the outer diameter of the second barrel and a change D2' in the inner diameter of the first barrel.

[0537]

Table 7

[0538]

[0539] In the formula, the resulting value of G1 can be greater than 0, and if it is less than 0, a blocking phenomenon may occur between the two barrels. The second gap G2 can be initially set to room temperature (25 degrees), as shown in Table 8.

[0540]

Table 8

[0541]

[0542] In Table 8, the H2 value is a fixed value, and if it is less than this value, it can be fixed by strong pressure of assembly. The second gap G2 can be calculated as in Table 9 under the conditions of the following formula, such as the change H1' in the height of the second barrel and the change H2' in the height of the fifth lens at a high temperature (+ΔT), for example, 85°C.

[0543]

Table 9

[0544]

[0545] In the formula, the resulting value of G2 may be greater than 0, and if it is less than 0, a blocking phenomenon may occur between the second lens barrel and the fifth lens.

[0546] The second gap G2 can be calculated under the conditions of the formula in Table 10, such as the height variation H1 ′ of the second barrel and the height variation H2 ′ of the fifth lens at a low temperature (−ΔT), for example, −65° C.

[0547]

Table 10

[0548]

[0549] In the formula, the resulting value of G2 may be greater than 0, and if it is less than 0, a blocking phenomenon may occur between the second barrel and the fifth lens. The third gap G3 can be initially set at room temperature (25 degrees) as shown in Table 11.

[0550]

Table 11

[0551]

[0552] Here, D3 may be calculated as the sum of the effective diameter of the sixth lens, the effective diameter margin, the length of the flange, and the thickness of the second barrel.

[0553] The third gap G3 may be calculated under the conditions of the following formula, such as a change D3' in the outer diameter of the second barrel and a change D2' in the inner diameter of the first lens at a high temperature (+ΔT), for example, 85°C.

[0554]

Table 12

[0555]

[0556] The third interval G3 can be calculated by the conditions of the formula in Table 13 for the change D3' in the outer diameter of the second barrel and the change D2' in the inner diameter of the first lens at a low temperature (-ΔT), for example, -65°C.

[0557]

Table 13

[0558]

[0559] As described above, taking into account the inner diameter of the first lens barrel 230, the inner diameter of the second lens barrel 240 (maximum value, minimum value), the thermal expansion coefficient of each component, the allowable error, etc., the first to third intervals are set to the optical design values ​​at room temperature, high temperature, and low temperature as described above, so that the fifth lens, the sixth lens, the seventh lens, and the first lens barrel and the second lens barrel can be coupled within the range of the optical design values.

[0560] like Fig.30 and Fig.31As shown in , the second lens barrel 240 made of plastic is coupled to the lower portion of the inner side of the first lens barrel 230, and the seventh lens 207 is coupled to the lower portion of the inner side of the second lens barrel 240 using the press jig 701, and then the sixth lens 206 is stacked on the object side of the seventh lens 207 using the press jig 701. Thereafter, the fourth lens and the fifth lens 205 as a cemented lens are stacked on the object side of the sixth lens 206 with the aid of the press jig 701, and at this time, the upper portion of the second lens barrel 240 can guide and couple the supporting portion 205B of the fifth lens 205 (see Fig.24 ). Thereafter, the third spacer (223) is coupled, and then the third lens 203 is laminated on the fourth lens 204 by means of the press jig 701, and then the second spacer 222 is coupled, and then the second lens 202 is laminated on the third lens 203 by means of the press jig 701. Thereafter, the first spacer 221 is laminated, and then the first lens 201 is coupled to the object side of the second lens 202, and the cover 250 having the opening 251 at the upper half of the first lens barrel 230 can be coupled to the outer periphery of the first lens barrel 230.

[0561] Fig.32 is an example of a plan view of a vehicle to which a camera module or an optical system according to an embodiment of the present invention is applied.

[0562] refer to Fig.32 , the vehicle-mounted camera system according to an embodiment of the present invention includes an image generating unit 11; a first information generating unit 12; second information generating units 21, 22, 23, 24, 25, 26 and a control unit 14. The image generating unit 11 may include at least one camera module 31 disposed in the vehicle, and may capture the front of the vehicle and / or the driver to generate a front image of the vehicle or an internal image of the vehicle. The image generating unit 11 is capable of using the camera module 31 to capture the surroundings of the vehicle in one or more directions and the front of the vehicle to generate an image of the surroundings of the vehicle. Here, the front image and the surrounding image can be digital images, and can include color images, black and white images, and infrared images. In addition, the front image and the surrounding image can include still images and moving images. The image generating unit 11 provides the driver image, the front image, and the surrounding image to the control unit 14. Next, the first information generating unit 12 can include at least one radar and / or camera disposed in the vehicle, and detects the front of the vehicle to generate first detection information. Specifically, the first information generating unit 12 is disposed in the vehicle, and detects the position and speed of a vehicle located in front of the vehicle, the presence and position of a pedestrian, and generates first detection information.

[0563] By using the first detection information generated by the first information generating unit 12, the distance between the own vehicle and the vehicle in front can be controlled to remain constant, and the stability of the vehicle operation can be increased under certain preset circumstances, such as when the driver wants to change the driving lane of the own vehicle or when reversing and parking. The first information generating unit 12 provides the first detection information to the control unit 14. The second information generating units 21, 22, 23, 24, 25 and 26 detect each side of the own vehicle and generate the second detection information based on the front image generated by the image generating unit 11 and the first detection information generated by the first information generating unit 12. Specifically, the second information generating units 21, 22, 23, 24, 25 and 26 may include at least one radar and / or camera disposed in the own vehicle, and may detect the position and speed of the vehicle located on the side of the own vehicle or capture an image. Here, the second information generating units 21, 22, 23, 24, 25 and 26 may be placed at the two corners in front of the vehicle, the side mirrors, and the two corners in the rear center and the rear, respectively.

[0564] At least one information generating unit among these vehicle-mounted camera systems may be equipped with an optical system and a camera module having the optical system as described in the above-mentioned embodiments, and may provide or process information obtained through the front, rear, each side or corner area of ​​the vehicle to the user to protect the vehicle and objects from the impact of autonomous driving or the safety of the surrounding environment. The optical system of the camera module according to an embodiment of the present invention may be installed in multiple units in the vehicle for safety regulations, enhancing autonomous driving functions and increasing convenience. In addition, the optical system of the camera module is applied in the vehicle as a component for control of systems such as lane keeping assist systems (LKAS), lane departure warning systems (LDWS) and driver monitoring systems (DMS). This vehicle-mounted camera module is able to provide a module that can achieve stable optical performance and is competitively priced even when the ambient temperature changes, thereby ensuring the reliability of vehicle components.

[0565] The features, structures, effects, etc. described in the above-mentioned embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to one embodiment. In addition, the features, structures, and effects illustrated in each embodiment can be combined or modified by a person skilled in the art to which the embodiment belongs relative to other embodiments. Therefore, the contents related to these combinations and changes should be interpreted as being included in the scope of the present invention. Although described based on the embodiments, this is only an example, the present invention is not limited thereto, and it will be apparent to a person skilled in the art that various modifications and applications not illustrated above are possible without departing from the basic characteristics of this embodiment. For example, each component specifically shown in the embodiment can be modified and implemented. And the differences associated with these modifications and applications should be interpreted as being included in the scope of the present invention defined by the appended claims.

Claims

1. An optical system, comprising: first to seventh lenses, the first to seventh lenses being aligned along the optical axis from the object side toward the sensor side, Wherein, the refractive power of the first lens is negative, The combined refractive power of the third lens to the seventh lens is positive. wherein the first lens has a meniscus shape that is convex toward the sensor side on the optical axis, wherein the center thickness of the first lens is greater than the center thickness of each of the second lens to the seventh lens, Wherein, the first lens to the seventh lens include a plurality of aspherical lenses, and Each of the plurality of aspherical lenses has a meniscus shape that is convex toward the object side on the optical axis.

2. The optical system according to claim 1, wherein: An effective diameter of the first lens is greater than effective diameters of the fourth to seventh lenses.

3. The optical system according to claim 1, comprising: An aperture stop is provided on a periphery between the second lens and the third lens.

4. The optical system according to claim 3, wherein: The plurality of aspherical lenses are disposed closer to the image sensor than the aperture stop.

5. The optical system according to any one of claims 1 to 4, wherein: The first lens to the seventh lens are made of glass, The number of lenses whose object-side surfaces and sensor-side surfaces are spherical is at least twice the number of lenses whose object-side surfaces and sensor-side surfaces are aspherical.

6. The optical system according to claim 5, wherein: The first lens to the fifth lens are spherical lenses.

7. The optical system according to any one of claims 1 to 4, wherein: A sensor-side surface of the fourth lens and an object-side surface of the fifth lens are bonded.

8. The optical system according to any one of claims 1 to 4, wherein: 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 2, the value of CTi / CGi is the smallest, and Among them, when i is 1, the value of CTi / CGi is the largest.

9. The optical system according to any one of claims 1 to 3, wherein: The center thickness of the first lens is CT1, Wherein, the optical axis distance from the center of the object side surface of the first lens to the surface of the image sensor is TTL, Among them, the following formula is satisfied: <CT1 / TTL<0.25。 10. The optical system according to any one of claims 1 to 3, wherein: The center thickness of the first lens is CT1, The center distance between the second lens and the third lens is CG2, and Among them, the following formula is satisfied: 2 <CT1 / CG2<5。 11. A camera module comprising: Image sensor; as well as first to seventh lenses, the first to seventh lenses being aligned along the optical axis from the object side toward the sensor side; an aperture stop, the aperture stop being disposed between the spherical lenses of the first lens to the seventh lens; as well as an optical filter disposed between the seventh lens and the image sensor, wherein the first lens has a meniscus shape convex toward the sensor on the optical axis, Wherein, the first lens and the seventh lens have negative refractive power, The combined refractive power of the third lens to the seventh lens is positive. The cemented lens of the second lens to the seventh lens is disposed between the aperture stop and the seventh lens and bonded to each other. wherein the cemented lens has an object-side surface that is convex on the optical axis and a sensor-side surface that is concave, Wherein, the first lens to the seventh lens include a plurality of aspherical lenses, wherein the plurality of aspherical lenses are arranged closer to the image sensor than the aperture stop, and Wherein, the first lens to the fifth lens have a spherical object side surface and a sensor side surface.

12. The camera module according to claim 11, wherein: The aperture stop is provided on the periphery between the second lens and the third lens, and Wherein, the sixth lens and the seventh lens have aspherical object-side surfaces and sensor-side surfaces.

13. A camera module comprising: a first lens group, the first lens group having a plurality of lenses; a second lens group, the second lens group having at least one lens; a first lens barrel disposed on a periphery of the first lens group; a second lens barrel, the second lens barrel being arranged between the first lens barrel and the second lens group, wherein the lenses of the first lens group and the lenses of the second lens group are aligned on the optical axis, Wherein, the first lens barrel and the second lens barrel are made of different materials, wherein the material of the first lens group and the lens material of the second lens group are different from each other, and The material of the lenses of the second lens group is the same as that of the second lens barrel.

14. The camera module according to claim 13, wherein: The lens material of the second lens barrel and the second lens group is plastic.

15. The camera module according to claim 13 or 14, wherein: The first lens barrel is made of aluminum, Wherein, the second lens barrel is made of plastic, wherein at least two or more lenses disposed on the object side among the lenses arranged inside the first lens barrel are made of glass, and Wherein, the lens arranged inside the second lens barrel includes two plastic lenses.

16. The camera module according to claim 15, comprising a cemented lens provided between the lens made of glass and the plastic lens, in, The object side lens in the cemented lens is spaced apart from the inner surface of the first lens barrel, and the sensor side lens is in contact with the inner surface of the second lens barrel, and Wherein, the cemented lens is made of glass.

Images