Optical system, camera module and electronic device

Abstract

An optical system, a camera module and an electronic device, the optical system comprising, in order from an object side to an image side along an optical axis, a first lens to a seventh lens having refractive power, and the first lens and the fifth lens having negative refractive power, and the second lens, the third lens, the fourth lens and the sixth lens having positive refractive power, wherein the object side surface and the image side surface of the first lens, the object side surface and the image side surface of the fifth lens, the image side surface of the sixth lens and the object side surface of the seventh lens are all concave at a near optical axis, and the object side surface and the image side surface of the second lens, the object side surface and the image side surface of the third lens, the object side surface and the image side surface of the fourth lens, the object side surface of the sixth lens and the image side surface of the seventh lens are all convex at the near optical axis. Through reasonable design of the surface shape and the refractive power of each lens of the optical system, it is conducive to meeting the characteristics of large aperture, high relative luminance and large field of view.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of optical imaging technology, and particularly relates to an optical system, a camera module and an electronic device. BACKGROUND

[0002] With the rapid development of automobile auxiliary driving technology, optical systems are widely used in automobiles, especially in the fields of vehicle-mounted reversing image systems, vehicle recorders, automatic parking systems, panoramic image systems and road navigation, and the optical system has become an indispensable key component.

[0003] In the automatic driving auxiliary system, the vehicle-mounted optical system plays a crucial role, responsible for capturing and transmitting the information of the surrounding environment. With the continuous progress of automatic driving technology, the requirements for the forward-looking optical system are also constantly improving, and it needs to have high resolution, large target surface and low distortion and other performances. In addition, with the increasing demand for night driving, the performance of the vehicle-mounted lens in low light environment also becomes particularly important. Therefore, the market urgently needs a small-sized optical system with a large aperture, high relative luminance, and a large field of view, high imaging clarity to meet the needs of modern automobile forward-looking systems. SUMMARY

[0004] The purpose of the present application is to provide an optical system, a camera module and an electronic device, which solves the problem that the vehicle-mounted optical system needs to have a large aperture, high relative luminance and a large field of view.

[0005] To achieve the purpose of the present application, the present application provides the following technical solutions:

[0006] In a first aspect, the present application provides an optical system, which has seven lenses with refractive power, arranged along the optical axis from the object side to the image side in order: a first lens with negative refractive power, the object side surface of the first lens is concave at the near optical axis, and the image side surface of the first lens is concave at the near optical axis; a second lens with positive refractive power, the object side surface of the second lens is convex at the near optical axis, and the image side surface of the second lens is convex at the near optical axis; a third lens with positive refractive power, the object side surface of the third lens is convex at the near optical axis, and the image side surface of the third lens is convex at the near optical axis; a fourth lens with positive refractive power, the object side surface of the fourth lens is convex at the near optical axis, and the image side surface of the fourth lens is convex at the near optical axis; a fifth lens with negative refractive power, the object side surface of the fifth lens is concave at the near optical axis, and the image side surface of the fifth lens is concave at the near optical axis; a sixth lens with positive refractive power, the object side surface of the sixth lens is convex at the near optical axis, and the image side surface of the sixth lens is concave at the near optical axis; a seventh lens with positive or negative refractive power, the object side surface of the seventh lens is concave at the near optical axis, and the image side surface of the seventh lens is convex at the near optical axis.

[0007] The optical system satisfies a relationship: 1.65≤FNO≤1.75, 34deg≤FOV≤50deg; wherein, FNO is an aperture number of the optical system, and FOV is a maximum field of view angle of the optical system.

[0008] By making the first lens have negative refractive power, and the object side surface of the first lens being concave at the vicinity of the optical axis, and the image side surface of the first lens being concave at the vicinity of the optical axis, it is beneficial to the gentle entry of light, so that the light is not too much folded, effectively reducing the field curvature, astigmatism of the optical system, and reducing the sensitivity of the overall optical system; by making the second lens have positive refractive power, and the object side surface of the second lens being convex at the vicinity of the optical axis, and the image side surface of the second lens being convex at the vicinity of the optical axis, it is beneficial to the preliminary correction of the astigmatism of the optical system, and effectively controls the trend of the light, achieving a larger aperture; by making the third lens have positive refractive power, and the object side surface of the third lens being convex at the vicinity of the optical axis, and the image side surface of the third lens being convex at the vicinity of the optical axis, it is beneficial to collect and compress the incident light on the object side, so that the light smoothly transitions to the optical system on the image side; by making the fourth lens have positive refractive power, and the object side surface of the fourth lens being convex at the vicinity of the optical axis, and the image side surface of the third lens being convex at the vicinity of the optical axis, it provides a reasonable light incidence angle for the introduction of marginal light; by making the fifth lens have negative refractive power, and the object side surface of the third lens being concave at the vicinity of the optical axis, and the image side surface of the third lens being concave at the vicinity of the optical axis, it is beneficial to the entry and deflection of marginal light, which can reduce the deflection angle borne by the rear lens, so that the deflection angle of the light on each lens is more uniform, effectively correcting the aberration of the edge field of view; the fourth lens and the fifth lens are cemented lenses, which are beneficial to correcting chromatic aberration and balancing various aberrations, improving the resolving power of the optical system, and effectively reducing the tolerance sensitivity, and improving the imaging quality of the optical system; by making the sixth lens have positive refractive power, and the object side surface of the sixth lens being convex at the vicinity of the optical axis, and the image side surface of the sixth lens being concave at the vicinity of the optical axis, it is beneficial to lower the light incidence angle of the light after passing through the diaphragm, so that more light enters the optical system on the image side, improving the illumination of the optical system; by making the seventh lens have positive refractive power or negative refractive power, and the object side surface of the seventh lens being concave at the vicinity of the optical axis, and the image side surface of the seventh lens being convex at the vicinity of the optical axis, through specific surface shape matching and reasonable refractive power distribution, the imaging quality of the optical system can be improved, the aberration can be reduced, and the imaging quality of the optical system can be improved.

[0009] By making the optical system satisfy the relationship: 1.65≤FNO≤1.75, the aperture number of the optical system is set in a reasonable range, the light transmission capability of the optical system is improved, the relative illumination of the optical system is higher, and the optical system also has good imaging quality in dark environments such as night or rainy days, meeting the requirements of large aperture and high resolution.

[0010] By making the optical system satisfy the relationship: 34deg≤FOV≤50deg, the maximum field of view angle of the optical system is controlled within a reasonable range, which can avoid introducing excessive aberration and is beneficial to the optical system to obtain sufficient field of view while satisfying the characteristics of miniaturization.

[0011] In an embodiment, the optical system satisfies the relationship: 2.2≤TTL / F≤3.1; wherein TTL is the distance from the object side of the first lens to the imaging surface on the optical axis, and F is the effective focal length of the optical system. By making the optical system satisfy the above relationship, the ratio of the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis and the effective focal length of the optical system is reasonably configured, so that the optical system has a smaller total optical length, and the characteristics of miniaturization are realized.

[0012] In an embodiment, the optical system satisfies the relationship: 3.6≤CTMAX / CTMIN≤6; wherein CTMAX is the maximum thickness of the first lens to the seventh lens on the optical axis, and CTMIN is the minimum thickness of the first lens to the seventh lens on the optical axis. By making the optical system satisfy the above relationship, the ratio of the maximum central thickness and the minimum central thickness of the first lens to the seventh lens is reasonably controlled, which can make the thickness distribution of the lens more uniform, thereby being beneficial to improve the spatial layout and processability of the optical system.

[0013] In an embodiment, the optical system satisfies the relationship: 6≤TTL / IMGH≤8.5; wherein IMGH is half of the maximum field of view angle corresponding to the image height of the optical system. By making the optical system satisfy the above relationship, under a certain optical system image height, by controlling the ratio of the image height and the focal length of the optical system, the total length of the optical system is limited to be smaller, so as to realize the characteristics of miniaturization.

[0014] In an embodiment, the optical system satisfies the relationship: 1.2≤SD1 / SD14≤1.8; wherein SD1 is half of the maximum effective aperture of the object side of the first lens, and SD14 is half of the maximum effective aperture of the image side of the seventh lens. By making the optical system satisfy the above relationship, the light ray of the optical system is constrained, and the large gap structure between the first lens and the seventh lens is avoided, the deflection angle of the light ray is reduced, excessive aberration is avoided, the imaging quality is improved, and the stability of the optical system assembly is improved.

[0015] In one embodiment, the optical system satisfies the relationship: 4.7≤TTL / D1≤6.7; where D1 is half of the maximum effective aperture of the object side and the image side of the first lens. By making the optical system satisfy the above relationship, in the case of a certain total length of the optical system, by controlling the ratio of the larger optical full aperture value of the first lens to the total length of the optics, the size and volume of the lens head are limited to achieve the characteristics of miniaturization.

[0016] In one embodiment, the optical system satisfies the relationship: 0.15≤BFL / F≤0.3; where BFL is the distance on the optical axis from the image side of the seventh lens to the imaging surface of the optical system. By making the optical system satisfy the above relationship, it is beneficial to balance between obtaining good imaging quality and easy-to-assemble optical back focal length, to ensure the imaging quality of the optical system while avoiding interference between the lens and other elements, and to reduce the assembly process difficulty of the camera module.

[0017] In one embodiment, the optical system satisfies the relationship: 1≤R3 / F≤1.3; where R3 is the radius of curvature of the object side of the second lens at the optical axis. By making the optical system satisfy the above relationship, by appropriately increasing the radius of curvature of the object side of the second lens at the optical axis within a certain range, the convex surface can be directed towards the image side, further converging light rays and suppressing the edge field of view, thereby improving the imaging quality of the optical system.

[0018] In one embodiment, the optical system satisfies the relationship: -5≤F1 / CT1≤-3; where F1 is the effective focal length of the first lens, and CT1 is the thickness of the first lens on the optical axis. By making the optical system satisfy the above relationship, it is beneficial to reasonably configure the refractive power and thickness of the first lens, thereby effectively controlling the incidence angle of light rays in the optical system, reducing the sensitivity of the optical system, correcting aberrations generated by the optical system, and further improving the imaging quality of the optical system.

[0019] In one embodiment, the optical system satisfies the relationship: 2.2≤F4 / CT4≤2.9; where F4 is the effective focal length of the fourth lens, and CT4 is the thickness of the fourth lens on the optical axis. By making the optical system satisfy the above relationship, it is beneficial to reasonably configure the refractive power and thickness of the fourth lens, thereby effectively controlling the incidence angle of light rays in the optical system, reducing the sensitivity of the optical system, correcting aberrations generated by the optical system, and further improving the imaging quality of the optical system.

[0020] In an embodiment, the optical system satisfies a relationship: -12≤F45 / (CT4+CT5)≤-3; wherein F45 is a combined effective focal length of the fourth lens and the fifth lens, and CT5 is a thickness of the fifth lens on the optical axis. By causing the optical system to satisfy the above relationship, the relationship between the thickness of the fourth lens and the fifth lens on the optical axis and the combined focal length of the fourth lens and the fifth lens is constrained, which helps to weaken the contribution of the fourth lens and the fifth lens to chromatic aberration while the optical system has a larger field of view, so that the lens has a larger imaging view angle and high imaging resolution.

[0021] In an embodiment, the optical system satisfies a relationship: -4.5≤R9 / R10≤-1.5; wherein R9 is a curvature radius of an object side surface of the fifth lens at the optical axis, and R10 is a curvature radius of an image side surface of the fifth lens at the optical axis. By causing the optical system to satisfy the above relationship, the ratio of the curvature radius of the object side surface of the fifth lens at the optical axis to the curvature radius of the image side surface of the fifth lens at the optical axis is reasonably configured, the shape of the fifth lens is controlled, the spherical aberration, chromatic aberration and field curvature of the optical system are comprehensively balanced, the risk of ghosting is reduced, the resolving power of the optical system is improved, and the processing difficulty of the fifth lens is also reduced.

[0022] In an embodiment, the optical system satisfies a relationship: 1.5≤F6 / F≤2.7; wherein F6 is an effective focal length of the sixth lens. By causing the optical system to satisfy the above relationship, the refractive power of the sixth lens in the optical system is properly matched, the surface type design of the sixth lens is more simple and flexible, the aberration is reduced, and the balance of aberration correction and imaging quality of the whole optical system is simplified.

[0023] In an embodiment, the optical system satisfies a relationship: 2≤CT3 / ET3≤3.4; wherein CT3 is a thickness of the third lens on the optical axis, and ET3 is an edge thickness of the third lens, that is, a distance in a direction parallel to the optical axis from a maximum effective aperture of the object side surface of the third lens to a maximum effective aperture of the image side surface of the third lens. By causing the optical system to satisfy the above relationship, the ratio relationship between the thickness of the third lens on the optical axis and the edge thickness is controlled, which not only effectively balances the high-order aberration generated by the optical system, but also helps to adjust the field curvature of the third lens, thereby improving the imaging quality of the optical system. At the same time, the appropriate edge thickness can also provide sufficient mechanical strength for the lens, thereby reducing the processing difficulty.

[0024] In an embodiment, the optical system satisfies a relationship: 3≤|(R5-R6) / (R5+R6)|≤150; wherein R5 is a radius of curvature of an object side surface of the third lens at the optical axis, and R6 is a radius of curvature of an image side surface of the third lens at the optical axis. By making the optical system satisfy the above relationship, the optical system is facilitated to receive the light rays diverged from the second lens and smoothly enter the rear; by moderately converging the front light rays, the light rays are smoothly transitioned, the light energy loss is reduced, the incident light rays are facilitated to be preliminarily aberration-corrected, high resolution is facilitated to be achieved, and the resolution capability of the optical system is improved.

[0025] In an embodiment, the optical system satisfies a relationship: 1.7≤F3 / F≤2; wherein F3 is an effective focal length of the third lens. By making the optical system satisfy the above relationship, the effective focal length of the third lens is reasonably set, the front incident light rays are effectively collected and compressed, the light rays are smoothly transitioned into the rear optical system, the generation of aberration is reduced, and the imaging quality of the lens is improved.

[0026] In an embodiment, the optical system satisfies a relationship: -2.5≤(SAG13+SAG14) / CT7≤-1; wherein SAG13 is a sag of the object side surface of the seventh lens at the maximum effective aperture, i.e., a distance between the intersection of the object side surface of the seventh lens and the optical axis and the maximum effective aperture of the object side surface of the seventh lens in a direction parallel to the optical axis, SAG14 is a sag of the image side surface of the seventh lens at the maximum effective aperture, i.e., a distance between the intersection of the image side surface of the seventh lens and the optical axis and the maximum effective aperture of the image side surface of the seventh lens in a direction parallel to the optical axis, and CT7 is a thickness of the seventh lens on the optical axis. By making the optical system satisfy the above relationship, the curvature is optimized, the field curvature of the first lens to the sixth lens is offset, and the image height of the optical system is effectively controlled.

[0027] In an embodiment, the optical system satisfies a relationship: 0.5≤R14 / R13≤5; wherein R13 is a radius of curvature of the object side surface of the seventh lens at the optical axis, and R14 is a radius of curvature of the image side surface of the seventh lens at the optical axis. By making the optical system satisfy the above relationship, by reasonably matching the ratio between the radius of curvature of the object side surface and the image side surface of the seventh lens at the optical axis, the face type difference of the seventh lens is reasonably set, the shape of the seventh lens is facilitated to be controlled, the aberration generated by itself is corrected, and the imaging quality is improved.

[0028] In an embodiment, the optical system satisfies a relationship: 0.6≤SAG13 / SAG14≤2.8. By making the optical system satisfy the above relationship, the shape of the seventh lens is well controlled, the molding and processing of the seventh lens are facilitated, the field curvature generated by each lens on the object side is trimmed, and the balance of the field curvature of the optical system is ensured.

[0029] In an embodiment, the optical system satisfies a relationship: 10mm≤TTLxIMGH / F≤15mm. By making the optical system satisfy the above relationship, the optical system can satisfy the market demand for large imaging surface IMG (imaging chip) and the market demand for miniaturization of the optical system, and the optical system can satisfy the market demand for both large target surface and miniaturization.

[0030] In an embodiment, the optical system satisfies a relationship: 0.93≤IMGH / (Fxtan(FOV / 2))≤1.01. By making the optical system satisfy the above relationship, the optical aberration of the optical system can be better controlled, and the resolution of the optical system can be improved.

[0031] In an embodiment, the optical system satisfies a relationship: 2.3deg / mm≤FOV / F≤4deg / mm. By making the optical system satisfy the above relationship, the field of view angle is controlled within a reasonable range, so that the focal length reaches a long distance, and a telephoto function is realized.

[0032] In a second aspect, the present application further provides a camera module, which comprises a photosensitive chip and the optical system according to any one of the embodiments of the first aspect, and the photosensitive chip is arranged on the image side of the optical system. The photosensitive surface of the photosensitive chip is located on the imaging surface of the optical system, and the light rays of an object incident on the photosensitive surface through the lens can be converted into an electrical signal of an image. The photosensitive chip can be a complementary metal oxide semiconductor (CMOS) or a charge-coupled device (CCD). The camera module can be an imaging module integrated on an electronic device, or can be a separate lens. By adding the optical system provided by the present application to the camera module, the camera module can have the characteristics of large aperture, high relative luminance, and large field of view angle by reasonably designing the surface shape and refractive power of each lens in the optical system.

[0033] In a third aspect, the present application further provides an electronic device, which comprises a shell and the camera module according to the second aspect, and the camera module is arranged in the shell. The electronic device includes but is not limited to a car, a monitoring device, a smart phone, a computer, a smart watch, and the like. By adding the camera module provided by the present application to the electronic device, the electronic device can have the characteristics of large aperture, high relative luminance, and large field of view angle. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only aim to some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative effort based on these drawings.

[0035] Figure 1 is a structural schematic diagram of an optical system of a first embodiment;

[0036] Figure 2 Longitudinal spherical aberration curves, astigmatism curves and distortion curves of the optical system of the first embodiment are shown;

[0037] Figure 3 is a structural schematic diagram of an optical system of a second embodiment;

[0038] Figure 4 Longitudinal spherical aberration curves, astigmatism curves and distortion curves of the optical system of the second embodiment are shown;

[0039] Figure 5 is a structural schematic diagram of an optical system of a third embodiment;

[0040] Figure 6 Longitudinal spherical aberration curves, astigmatism curves and distortion curves of the optical system of the third embodiment are shown;

[0041] Figure 7 is a structural schematic diagram of an optical system of a fourth embodiment;

[0042] Figure 8 Longitudinal spherical aberration curves, astigmatism curves and distortion curves of the optical system of the fourth embodiment are shown;

[0043] Figure 9 is a structural schematic diagram of an optical system of a fifth embodiment;

[0044] Figure 10 Longitudinal spherical aberration curves, astigmatism curves and distortion curves of the optical system of the fifth embodiment are shown;

[0045] Figure 11 is a structural schematic diagram of a camera module in an embodiment of the present application;

[0046] Figure 12 is a structural schematic diagram of an electronic device in an embodiment of the present application. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0048] In a first aspect, the present application provides an optical system, which has seven lenses with refractive power, and comprises, in order from the object side to the image side along the optical axis: a first lens with negative refractive power, the object side surface of the first lens is concave at the vicinity of the optical axis, and the image side surface of the first lens is concave at the vicinity of the optical axis; a second lens with positive refractive power, the object side surface of the second lens is convex at the vicinity of the optical axis, and the image side surface of the second lens is convex at the vicinity of the optical axis; a third lens with positive refractive power, the object side surface of the third lens is convex at the vicinity of the optical axis, and the image side surface of the third lens is convex at the vicinity of the optical axis; a fourth lens with positive refractive power, the object side surface of the fourth lens is convex at the vicinity of the optical axis, and the image side surface of the fourth lens is convex at the vicinity of the optical axis; a fifth lens with negative refractive power, the object side surface of the fifth lens is concave at the vicinity of the optical axis, and the image side surface of the fifth lens is concave at the vicinity of the optical axis; a sixth lens with positive refractive power, the object side surface of the sixth lens is convex at the vicinity of the optical axis, and the image side surface of the sixth lens is concave at the vicinity of the optical axis; and a seventh lens with positive refractive power or negative refractive power, the object side surface of the seventh lens is concave at the vicinity of the optical axis, and the image side surface of the seventh lens is convex at the vicinity of the optical axis.

[0049] The optical system satisfies the relationship: 1.65≤FNO≤1.75, 34deg≤FOV≤50deg; wherein FNO is the aperture number of the optical system, and FOV is the maximum field of view angle of the optical system. Specifically, the value of FNO can be 1.65, 1.67, 1.69, 1.70, 1.72, 1.73, 1.74, 1.75, etc. Specifically, the value of FOV can be 34deg, 38deg, 40deg, 42deg, 44deg, 46deg, 48deg, 50deg, etc.

[0050] By making the first lens have negative refractive power, and the object side surface of the first lens be concave at the near optical axis, and the image side surface of the first lens be concave at the near optical axis, it is beneficial to the gentle entry of light, so that the light is not excessively bent, effectively reducing the field curvature, astigmatism of the optical system, and reducing the sensitivity of the overall optical system; by making the second lens have positive refractive power, and the object side surface of the second lens be convex at the near optical axis, and the image side surface of the second lens be convex at the near optical axis, it is beneficial to the preliminary correction of the astigmatism of the optical system, and effectively controls the trend of the light, realizing a larger aperture; by making the third lens have positive refractive power, and the object side surface of the third lens be convex at the near optical axis, and the image side surface of the third lens be convex at the near optical axis, it is beneficial to collect and compress the incident light on the object side, so that the light smoothly transitions to the optical system on the image side; by making the fourth lens have positive refractive power, and the object side surface of the fourth lens be convex at the near optical axis, and the image side surface of the third lens be convex at the near optical axis, it provides a reasonable light incidence angle for the introduction of edge light; by making the fifth lens have negative refractive power, and the object side surface of the third lens be concave at the near optical axis, and the image side surface of the third lens be concave at the near optical axis, it is beneficial to the entry and deflection of edge light, which can reduce the deflection angle borne by the rear lens, so that the deflection angle of the light on each lens is relatively uniform, effectively correcting the aberration of the edge field of view; the fourth lens and the fifth lens are cemented lenses, which are beneficial to correcting chromatic aberration and balancing various aberrations, improving the resolving power of the optical system, and effectively reducing the tolerance sensitivity, and improving the imaging quality of the optical system; by making the sixth lens have positive refractive power, and the object side surface of the sixth lens be convex at the near optical axis, and the image side surface of the sixth lens be concave at the near optical axis, it is beneficial to lowering the light incidence angle of the light after passing through the diaphragm, so that more light enters the optical system on the image side, improving the illumination of the optical system; by making the seventh lens have positive refractive power or negative refractive power, and the object side surface of the seventh lens be concave at the near optical axis, and the image side surface of the seventh lens be convex at the near optical axis, through specific surface shape matching and reasonable refractive power distribution, the imaging quality of the optical system can be improved, the aberration can be reduced, and the imaging quality of the optical system can be improved.

[0051] By making the optical system satisfy the relationship: 1.65≤FNO≤1.75, the aperture number of the optical system is set in a reasonable range, the light transmission capability of the optical system is improved, the relative illumination of the optical system is higher, and the optical system also has good imaging quality in dark environments such as night or rainy days, meeting the requirements of large aperture and high resolution.

[0052] By making the optical system satisfy the relationship: 34deg≤FOV≤50deg, the maximum field angle of the optical system is controlled within a reasonable range, which can avoid introducing excessive aberration, and is beneficial to the optical system to obtain sufficient field of view while meeting the characteristics of miniaturization.

[0053] In an embodiment, the optical system satisfies a relationship: 2.2≤TTL / F≤3.1; where TTL is the distance from the object side of the first lens to the image plane on the optical axis, and F is the effective focal length of the optical system. Specifically, the value of TTL / F can be 2.235, 2.389, 2.432, 2.585, 2.653, 2.753, 2.886, 3.081, etc. By making the optical system satisfy the above relationship, the ratio of the distance from the object side of the first lens to the image plane on the optical axis of the optical system and the effective focal length of the optical system is reasonably configured, so that the optical system has a smaller total optical length, realizing the characteristics of miniaturization.

[0054] In an embodiment, the optical system satisfies a relationship: 3.6≤CTMAX / CTMIN≤6; where CTMAX is the maximum value of the thickness on the optical axis among the first lens to the seventh lens, and CTMIN is the minimum value of the thickness on the optical axis among the first lens to the seventh lens. Specifically, the value of CTMAX / CTMIN can be 3.659, 3.949, 4.285, 4.626, 4.837, 5.037, 5.911, 5.960, etc. By making the optical system satisfy the above relationship, the ratio of the maximum central thickness and the minimum central thickness among the first lens to the seventh lens is reasonably controlled, which can make the thickness distribution of the lens more uniform, thereby being beneficial to improving the spatial layout and processability of the optical system.

[0055] In an embodiment, the optical system satisfies a relationship: 6≤TTL / IMGH≤8.5; where IMGH is half of the image height corresponding to the maximum field angle of the optical system. Specifically, the value of TTL / IMGH can be 6.062, 6.582, 7.021, 7.258, 7.526, 7.779, 8.025, 8.411, etc. By making the optical system satisfy the above relationship, in the case of a certain optical system image height, by controlling the ratio of the image height and the focal length of the optical system, the total length of the optical system is limited to be smaller, so as to realize the characteristics of miniaturization.

[0056] In an embodiment, the optical system satisfies a relationship: 1.2≤SD1 / SD14≤1.8; wherein SD1 is half of the maximum effective aperture of the object side of the first lens, and SD14 is half of the maximum effective aperture of the image side of the seventh lens. Specifically, the value of SD1 / SD14 can be 1.230, 1.393, 1.397, 1.489, 1.500, 1.622, 1.703, 1.753, etc. By making the optical system satisfy the above relationship, it is beneficial to constrain the light path of the optical system, and to avoid a large gap structure between the first lens and the seventh lens, reduce the deflection angle of the light, avoid introducing excessive aberration, improve the imaging quality, and improve the stability of the assembly of the optical system.

[0057] In an embodiment, the optical system satisfies a relationship: 4.7≤TTL / D1≤6.7; wherein D1 is half of the maximum effective aperture of the object side and the image side of the first lens. Specifically, the value of TTL / D1 can be 4.709, 4.927, 5.466, 5.691, 5.726, 6.003, 6.425, 6.642, etc. By making the optical system satisfy the above relationship, in the case of a certain total length of the optical system, by controlling the ratio of the larger optical full aperture value of the first lens to the total length of the optical system, the size and volume of the lens head are limited to achieve the characteristics of miniaturization.

[0058] In an embodiment, the optical system satisfies a relationship: 0.15≤BFL / F≤0.3; wherein BFL is the distance on the optical axis from the image side of the seventh lens to the imaging surface of the optical system. Specifically, the value of BFL / F can be 0.169, 0.182, 0.193, 0.211, 2.325, 0.245, 0.274, 2.952, etc. By making the optical system satisfy the above relationship, it is beneficial to balance between obtaining good imaging quality and easy-to-assemble optical back focal length, to ensure the imaging quality of the optical system while avoiding interference between the lens and other elements, and to reduce the assembly process difficulty of the camera module.

[0059] In an embodiment, the optical system satisfies a relationship: 1≤R3 / F≤1.3; wherein R3 is the radius of curvature of the object side of the second lens at the optical axis. Specifically, the value of R3 / F can be 1.049, 1.122, 1.167, 1.200, 1.232, 1.256, 1.278, 1.292, etc. By making the optical system satisfy the above relationship, appropriately increasing the radius of curvature of the object side of the second lens at the optical axis within a certain range can make the convex surface face the image side, further converge the light, suppress the edge field of view, and thus improve the imaging quality of the optical system.

[0060] In an embodiment, the optical system satisfies a relationship: -5≤F1 / CT1≤-3; where F1 is the effective focal length of the first lens, and CT1 is the thickness of the first lens on the optical axis. Specifically, the value of F1 / CT1 can be -4.730, -4.522, -4.232, -3.955, -3.546, -3.497, -3.401, -3.359, etc. By causing the optical system to satisfy the above relationship, the refractive power and thickness of the first lens are reasonably configured, so that the incidence angle of light in the optical system can be effectively controlled, the sensitivity of the optical system is reduced, the aberration generated by the optical system is corrected, and the imaging quality of the optical system is improved.

[0061] In an embodiment, the optical system satisfies a relationship: 2.2≤F4 / CT4≤2.9; where F4 is the effective focal length of the fourth lens, and CT4 is the thickness of the fourth lens on the optical axis. Specifically, the value of F4 / CT4 can be 2.223, 2.306, 2.435, 2.547, 2.696, 2.702, 2.823, 2.873, etc. By causing the optical system to satisfy the above relationship, the refractive power and thickness of the fourth lens are reasonably configured, so that the incidence angle of light in the optical system can be effectively controlled, the sensitivity of the optical system is reduced, the aberration generated by the optical system is corrected, and the imaging quality of the optical system is improved.

[0062] In an embodiment, the optical system satisfies a relationship: -12≤F45 / (CT4+CT5)≤-3; where F45 is the combined effective focal length of the fourth lens and the fifth lens, and CT5 is the thickness of the fifth lens on the optical axis. Specifically, the value of F45 / (CT4+CT5) can be -11.268, -9.518, -9.108, -8.201, -7.665, -6.215, -4.684, -3.487, etc. By causing the optical system to satisfy the above relationship, the relationship between the thickness of the fourth lens and the fifth lens on the optical axis and the combined focal length of the fourth lens and the fifth lens is constrained, which helps the optical system to have a larger field of view while weakening the contribution of the fourth lens and the fifth lens to chromatic aberration, so that the lens has a larger imaging view angle and high imaging resolution.

[0063] In an embodiment, the optical system satisfies the relationship: -4.5≤R9 / R10≤-1.5; wherein R9 is the curvature radius of the object side surface of the fifth lens at the optical axis, and R10 is the curvature radius of the image side surface of the fifth lens at the optical axis. Specifically, the value of R9 / R10 can be -4.317, -3.852, -3.111, -2.756, -2.384, -2.188, -1.809, -1.623, etc. By making the optical system satisfy the above relationship, the ratio of the curvature radius of the object side surface of the fifth lens at the optical axis and the curvature radius of the image side surface of the fifth lens at the optical axis is reasonably configured, the shape of the fifth lens is controlled, the spherical aberration, chromatic aberration and field curvature of the optical system are comprehensively balanced, the risk of ghosting is reduced, the resolving power of the optical system is improved, and the machining difficulty of the fifth lens is also reduced.

[0064] In an embodiment, the optical system satisfies the relationship: 1.5≤F6 / F≤2.7; wherein F6 is the effective focal length of the sixth lens. Specifically, the value of F6 / F can be 1.507, 1.578, 1.602, 1.730, 1.923, 2.305, 2.506, 2.632, etc. By making the optical system satisfy the above relationship, the refractive power of the sixth lens in the optical system is properly matched, the surface type design of the sixth lens is more simple and flexible, the aberration is reduced, and the balance of the overall aberration correction and imaging quality of the optical system is simplified.

[0065] In an embodiment, the optical system satisfies the relationship: 2≤CT3 / ET3≤3.4; wherein CT3 is the thickness of the third lens on the optical axis, and ET3 is the edge thickness of the third lens, i.e. the distance from the maximum effective aperture of the object side surface to the maximum effective aperture of the image side surface of the third lens in the direction parallel to the optical axis. Specifically, the value of CT3 / ET3 can be 2.015, 2.053, 2.217, 2.352, 2.596, 2.895, 3.025, 3.381, etc. By making the optical system satisfy the above relationship, the ratio relationship between the thickness of the third lens on the optical axis and the edge thickness is controlled, which not only effectively balances the high-order aberration generated by the optical system, but also facilitates the adjustment of the field curvature of the third lens, thereby improving the imaging quality of the optical system. At the same time, the appropriate edge thickness can also provide sufficient mechanical strength for the lens, thereby reducing the machining difficulty.

[0066] In an embodiment, the optical system satisfies the relationship: 3≤|(R5-R6) / (R5+R6)|≤150; wherein R5 is the radius of curvature of the object side surface of the third lens at the optical axis, and R6 is the radius of curvature of the image side surface of the third lens at the optical axis. Specifically, the value of |(R5-R6) / (R5+R6)| can be 3.109, 3.297, 5.551, 47.031, 60.248, 85.369, 112.267, 132.029, etc. By making the optical system satisfy the above relationship, it is beneficial for the optical system to accept the diverging light rays from the second lens and smoothly enter the rear; by moderately converging the front light rays, the light ray transition is smooth, the light energy loss is reduced, which is beneficial for preliminary aberration correction of the incident light rays, and is beneficial for realizing high resolution and improving the resolution capability of the optical system.

[0067] In an embodiment, the optical system satisfies the relationship: 1.7≤F3 / F≤2; wherein F3 is the effective focal length of the third lens. Specifically, the value of F3 / F can be 1.716, 1.739, 1.746, 1.753, 1.795, 1.850, 1.902, 1.996, etc. By making the optical system satisfy the above relationship, the effective focal length of the third lens is reasonably set, which can effectively collect and compress the incident light rays in front, make the light rays smoothly transition into the optical system in the rear, reduce the generation of aberration, and thus improve the imaging quality of the lens.

[0068] In an embodiment, the optical system satisfies the relationship: -2.5≤(SAG13+SAG14) / CT7≤-1; wherein SAG13 is the sagitta of the object side surface of the seventh lens at the maximum effective aperture, i.e., the distance in the direction parallel to the optical axis from the intersection of the object side surface of the seventh lens and the optical axis to the maximum effective aperture of the object side surface of the seventh lens, SAG14 is the sagitta of the image side surface of the seventh lens at the maximum effective aperture, i.e., the distance in the direction parallel to the optical axis from the intersection of the image side surface of the seventh lens and the optical axis to the maximum effective aperture of the image side surface of the seventh lens, and CT7 is the thickness of the seventh lens on the optical axis. Specifically, the value of (SAG13+SAG14) / CT7 can be -2.363, -1.919, -1.786, -1.684, -1.523, -1.456, -1.258, -1.079, etc. By making the optical system satisfy the above relationship, it is helpful to optimize the curvature, offset the field curvature of the first lens to the sixth lens, and effectively control the image height of the optical system.

[0069] In an embodiment, the optical system satisfies the relationship: 0.5≤R14 / R13≤5; wherein R13 is the radius of curvature of the object side surface of the seventh lens at the optical axis, and R14 is the radius of curvature of the image side surface of the seventh lens at the optical axis. Specifically, the value of R14 / R13 can be 0.578, 0.925, 2.056, 2.610, 3.230, 4.025, 4.459, 4.916, etc. By making the optical system satisfy the above relationship, by reasonably matching the ratio between the radius of curvature of the object side surface and the image side surface of the seventh lens at the optical axis, the surface type difference of the seventh lens can be reasonably set, which is conducive to controlling the shape of the seventh lens, correcting the aberration generated by itself, and improving the imaging quality.

[0070] In an embodiment, the optical system satisfies the relationship: 0.6≤SAG13 / SAG14≤2.8. Specifically, the value of SAG13 / SAG14 can be 0.669, 0.925, 1.235, 1.969, 2.018, 2.256, 2.535, 2.723, etc. By making the optical system satisfy the above relationship, the shape of the seventh lens is well controlled, which is conducive to the molding and processing of the seventh lens. At the same time, the field curvature generated by each lens can also be adjusted to ensure the balance of the field curvature of the optical system.

[0071] In an embodiment, the optical system satisfies the relationship: 10mm≤TTL×IMGH / F≤15mm. Specifically, the value of TTL×IMGH / F can be 10.752mm, 11.266mm, 11.968mm, 12.568mm, 13.258mm, 13.958mm, 14.236mm, 14.619mm, etc. By making the optical system satisfy the above relationship, the optical system can meet the market demand for large imaging surface IMG (imaging chip) and miniaturization, and meet the market demand for large target surface and miniaturization at the same time.

[0072] In an embodiment, the optical system satisfies the relationship: 0.93≤IMGH / (F×tan(FOV / 2))≤1.01. Specifically, the value of IMGH / (F×tan(FOV / 2)) can be 0.939, 0.942, 0.944, 0.954, 0.965, 0.979, 0.986, 1.005, etc. By making the optical system satisfy the above relationship, the optical distortion of the optical system can be better controlled, and the resolving power of the optical system can be improved.

[0073] In an embodiment, the optical system satisfies a relationship: 2.3 deg / mm≤FOV / F≤4 deg / mm. Specifically, the value of FOV / F can be 2.321 deg / mm, 2.561 deg / mm, 2.658 deg / mm, 2.782 deg / mm, 3.077 deg / mm, 3.331 deg / mm, 3.568 deg / mm, 3.971 deg / mm, etc. By making the optical system satisfy the above relationship, the field of view is controlled within a reasonable range, so that the focal length reaches a long distance, and the telephoto function is realized.

[0074] In an embodiment, the optical system satisfies a relationship: 2.2≤F / IMGH≤3.3. Specifically, the value of F / IMGH can be 2.285, 2.456, 2.568, 2.729, 2.808, 2.944, 3.025, 3.256, etc. By making the optical system satisfy the above relationship, the refractive power of the optical system is matched with the image size, and the imaging quality of the optical system is improved.

[0075] In an embodiment, the optical system satisfies a relationship: 20≤FOV / FNO≤29. Specifically, the value of FOV / FNO can be 20.606, 23.030, 23.529, 24.987, 25.455, 26.789, 28.571, etc. By making the optical system satisfy the above relationship, the ratio of the field of view and the aperture number of the optical system is reasonably configured, the optical system has a combination effect of a large field of view and a large aperture, the optical system has a reasonable amount of light, the overall illumination of the imaging picture is improved, and the optical system is suitable for different lighting environments.

[0076] In an embodiment, the optical system satisfies a relationship: -1.4≤F1 / F≤-1.1. Specifically, the value of F1 / F can be -1.359, -1.356, -1.294, -1.256, -1.925, -1.756, -1.165, -1.156, etc. By making the optical system satisfy the above relationship, the refractive power of the first lens in the optical system is properly matched, the surface design of the first lens is more simple and flexible, the first lens can support a larger field of view and a large aperture, and the light rays incident from the first lens to the optical system are converged, the incident angle of the light rays is delayed, the aberration is reduced, and the balance of the overall aberration correction and the imaging quality of the optical system is simplified.

[0077] In an embodiment, the optical system satisfies a relationship: 1.3≤F2 / F≤1.6; wherein F2 is the effective focal length of the second lens. Specifically, the value of F2 / F can be 1.323, 1.357, 1.398, 1.425, 1.458, 1.500, 1.501, 1.532, etc. By making the optical system satisfy the above relationship, the power of the second lens in the optical system is properly matched, the surface design of the second lens is more simple and flexible, the aberration is reduced, and the balance between the aberration correction and the imaging quality of the overall optical system is simplified.

[0078] In an embodiment, the optical system satisfies a relationship: 0.8≤F4 / F≤1. Specifically, the value of F4 / F can be 0.851, 0.865, 0.875, 0.880, 0.925, 0.956, 0.946, 0.974, etc. By making the optical system satisfy the above relationship, the power of the fourth lens in the optical system is properly matched, the surface design of the fourth lens is more simple and flexible, the aberration is reduced, and the balance between the aberration correction and the imaging quality of the overall optical system is simplified.

[0079] In an embodiment, the optical system satisfies a relationship: -0.6≤F5 / F≤-0.4; wherein F5 is the effective focal length of the fifth lens. Specifically, the value of F5 / F can be -0.593, -0.571, -0.562, -0.558, -0.525, -0.481, -0.451, -0.425, etc. By making the optical system satisfy the above relationship, the power of the fifth lens in the optical system is properly matched, the surface design of the fifth lens is more simple and flexible, the aberration is reduced, and the balance between the aberration correction and the imaging quality of the overall optical system is simplified.

[0080] In an embodiment, the optical system satisfies a relationship: 1≤|F7 / F|≤12; wherein F7 is the effective focal length of the seventh lens. Specifically, the value of F7 / F can be 1.506, 1.622, 1.663, 3.589, 4.699, 6.587, 7.785, 11.820, etc. By making the optical system satisfy the above relationship, the power of the seventh lens in the optical system is properly matched, the surface design of the seventh lens is more simple and flexible, the aberration is reduced, and the balance between the aberration correction and the imaging quality of the overall optical system is simplified.

[0081] In an embodiment, the optical system satisfies a relationship: R1 / R2≥-2, where R1 is a radius of curvature of an object side surface of the first lens at the optical axis, and R2 is a radius of curvature of an image side surface of the first lens at the optical axis. Specifically, the value of R1 / R2 can be -1.974, -1.756, -1.259, -0.958, -0.418, -0.211, -0.187, -0.108, etc. By causing the optical system to satisfy the above relationship, the ratio of the radius of curvature of the object side surface of the first lens at the optical axis and the radius of curvature of the image side surface of the first lens at the optical axis is reasonably configured, the shape of the first lens is controlled, the spherical aberration, chromatic aberration, and field curvature of the optical system are comprehensively balanced, the risk of ghosting is reduced, the resolving power of the optical system is improved, and the machining difficulty of the first lens is reduced.

[0082] In an embodiment, the optical system satisfies a relationship: -0.3≤R3 / R4≤-0.15, where R4 is a radius of curvature of an image side surface of the second lens at the optical axis. Specifically, the value of R3 / R4 can be -0.280, -0.265, -0.234, -0.217, -0.216, -0.205, -0.188, -0.167, etc. By causing the optical system to satisfy the above relationship, the ratio of the radius of curvature of the object side surface of the second lens at the optical axis and the radius of curvature of the image side surface of the second lens at the optical axis is reasonably configured, the shape of the second lens is controlled, the spherical aberration, chromatic aberration, and field curvature of the optical system are comprehensively balanced, the risk of ghosting is reduced, the resolving power of the optical system is improved, and the machining difficulty of the second lens is reduced.

[0083] In an embodiment, the optical system satisfies a relationship: -1.1≤R5 / R6≤-0.5. Specifically, the value of R5 / R6 can be -1.015, -0.958, -0.875, -0.725, -0.695, -0.627, -0.535, -0.513, etc. By causing the optical system to satisfy the above relationship, the ratio of the radius of curvature of the object side surface of the third lens at the optical axis and the radius of curvature of the image side surface of the third lens at the optical axis is reasonably configured, the shape of the third lens is controlled, the spherical aberration, chromatic aberration, and field curvature of the optical system are comprehensively balanced, the risk of ghosting is reduced, the resolving power of the optical system is improved, and the machining difficulty of the third lens is reduced.

[0084] In an embodiment, the optical system satisfies a relationship: -0.8≤R7 / R8≤-0.4, where R7 is the radius of curvature of the object side surface of the fourth lens at the optical axis, and R8 is the radius of curvature of the image side surface of the fourth lens at the optical axis. Specifically, the value of R7 / R8 can be -0.780, -0.702, -0.644, -0.625, -0.571, -0.559, -0.498, -0.414, etc. By causing the optical system to satisfy the above relationship, the ratio of the radius of curvature of the object side surface of the fourth lens at the optical axis and the radius of curvature of the image side surface of the fourth lens at the optical axis is reasonably configured, the shape of the fourth lens is controlled, the spherical aberration, chromatic aberration and field curvature of the optical system are comprehensively balanced, the risk of ghosting is reduced, the resolving power of the optical system is improved, and the machining difficulty of the fourth lens is also reduced.

[0085] In an embodiment, the optical system satisfies a relationship: 0.2≤R11 / R12≤0.9, where R11 is the radius of curvature of the object side surface of the sixth lens at the optical axis, and R12 is the radius of curvature of the image side surface of the sixth lens at the optical axis. Specifically, the value of R11 / R12 can be 0.231, 0.323, 0.398, 0.459, 0.568, 0.758, 0.859, 0.863, etc. By causing the optical system to satisfy the above relationship, the ratio of the radius of curvature of the object side surface of the sixth lens at the optical axis and the radius of curvature of the image side surface of the sixth lens at the optical axis is reasonably configured, the shape of the sixth lens is controlled, the spherical aberration, chromatic aberration and field curvature of the optical system are comprehensively balanced, the risk of ghosting is reduced, the resolving power of the optical system is improved, and the machining difficulty of the sixth lens is also reduced.

[0086] In an embodiment, the optical system satisfies a relationship: 0.2≤R13 / R14≤1.8. Specifically, the value of R13 / R14 can be 0.203, 0.310, 0.383, 0.568, 0.758, 1.082, 1.458, 1.731, etc. By causing the optical system to satisfy the above relationship, the ratio of the radius of curvature of the object side surface of the seventh lens at the optical axis and the radius of curvature of the image side surface of the seventh lens at the optical axis is reasonably configured, the shape of the seventh lens is controlled, the spherical aberration, chromatic aberration and field curvature of the optical system are comprehensively balanced, the risk of ghosting is reduced, the resolving power of the optical system is improved, and the machining difficulty of the seventh lens is also reduced.

[0087] In some embodiments, the optical system further comprises a filter, which can be an infrared cut-off filter, an infrared band-pass filter or a dual-pass filter. In the present application, the filter is an infrared cut-off filter, which is used to filter out infrared light and only allow visible light to pass through, so that the imaging is more in line with the visual experience of the human eye. Of course, the filter can also be an infrared band-pass filter, which is fixedly arranged with each lens in the optical system. The infrared band-pass filter is used to pass through infrared light of a central wavelength, has the effect of filtering out background stray light, and is used for infrared lenses. In addition, the filter can also be a dual-pass filter, which can simultaneously transmit visible light and part of infrared light, thereby realizing different waveband selection, visible light imaging and infrared imaging, and thus realizing day and night use. The filter can be assembled with each lens as part of the optical system. In other embodiments, the filter can be an element independent of the optical system. The filter can be installed between the optical system and the photosensitive chip when the optical system and the photosensitive chip are assembled. It can be understood that the filter can be made of optical glass coating, colored glass or other materials, which can be selected according to actual needs and is not limited in the present embodiment. In other embodiments, a filter coating can be provided on at least one of the first to fifth lenses to achieve the filtering effect.

[0088] In some embodiments, at least one lens in the optical system can have a spherical surface shape. The design of the spherical surface shape can reduce the difficulty of lens preparation and reduce the preparation cost. In some embodiments, at least one lens of the optical system can also have an aspherical surface shape. When at least one side surface (object side surface or image side surface) of the lens is aspherical, the lens is said to have an aspherical surface shape. In some embodiments, the object side surface and the image side surface of each lens can also be designed as aspherical. Aspherical design can help the optical system more effectively eliminate aberration and improve imaging quality. In some embodiments, in order to balance the preparation cost, preparation difficulty, imaging quality and assembly difficulty, the design of the surface of each lens in the optical system can be a combination of spherical and aspherical surface shapes. In the present application, the second lens and the seventh lens have an aspherical surface shape, and the first lens, the third lens, the fourth lens, the fifth lens and the sixth lens have a spherical surface shape.

[0089] In some embodiments, the material of at least one lens in the optical system is glass (GL). For example, the first lens L1 closest to the object side can be made of glass. The temperature drift effect of the glass material of the first lens L1 can effectively reduce the influence of environmental temperature changes on the optical system, thereby maintaining better and more stable imaging quality. In some embodiments, the material of at least one lens in the optical system can also be plastic (PC). The plastic material can be polycarbonate, gum, etc. The lens with plastic material can reduce the production cost of the optical system, and the lens with glass material can withstand higher or lower temperature and has excellent optical effect and better stability. In some embodiments, lenses with different materials can be arranged in the optical system, that is, a combination of glass lenses and plastic lenses can be used, but the specific configuration relationship can be determined according to actual needs, which is not exhausted here.

[0090] First embodiment

[0091] For reference Figure 1 The optical system 10 of the present embodiment includes, in order from the object side to the image side along the optical axis direction:

[0092] The first lens L1 has negative refractive power. The object side surface S1 of the first lens L1 is concave near the optical axis, and the image side surface S2 is concave near the optical axis.

[0093] The second lens L2 has positive refractive power. The object side surface S3 of the second lens L2 is convex near the optical axis, and the image side surface S4 is convex near the optical axis.

[0094] The third lens L3 has positive refractive power. The object side surface S5 of the third lens L3 is convex near the optical axis, and the image side surface S6 is convex near the optical axis.

[0095] The fourth lens L4 has positive refractive power. The object side surface S7 of the fourth lens L4 is convex near the optical axis, and the image side surface S8 is convex near the optical axis.

[0096] The fifth lens L5 has negative refractive power. The object side surface S9 of the fifth lens L5 is concave near the optical axis, and the image side surface S10 is concave near the optical axis.

[0097] The sixth lens L6 has positive refractive power. The object side surface S11 of the sixth lens L6 is convex near the optical axis, and the image side surface S12 is concave near the optical axis.

[0098] The seventh lens L7 has negative refractive power. The object side surface S13 of the seventh lens L7 is concave near the optical axis, and the image side surface S14 is convex near the optical axis.

[0099] In addition, the optical system 10 further comprises a stop STO, an optical filter IR, a cover glass CG and an imaging surface IMG. In this embodiment, the stop STO is arranged between the image side of the second lens L2 and the object side of the third lens L3 of the optical system 10, for controlling the amount of light. The optical filter IR is arranged between the seventh lens L7 and the cover glass CG, and comprises an object side S15 and an image side S16. The optical filter IR is an infrared cut-off filter, which is used to filter out infrared light, so that the light entering the imaging surface IMG is visible light, the wavelength of which is 380-780 nm. The material of the infrared cut-off filter can be glass (GLASS) or plastic (Plastic), and a film can be coated on the surface thereof. The cover glass CG is arranged between the optical filter IR and the imaging surface IMG, and comprises an object side S17 and an image side S18. The materials of the first lens L1 to the sixth lens L7 can be glass (GLASS) or plastic (Plastic). The effective pixel area of the photosensitive chip is located at the imaging surface, and an infrared light photosensitive chip is arranged at the imaging surface IMG. The photosensitive chip captures different waveband information of the object for subsequent processing.

[0100] Table 1a shows the parameters of the optical system 10 of this embodiment, wherein the Y radius is the radius of curvature of the object side or the image side of the corresponding surface number at the optical axis. The surface number S1 and the surface number S2 are the object side S1 and the image side S2 of the first lens L1, respectively. That is, in the same lens, the surface with the smaller surface number is the object side, and the surface with the larger surface number is the image side. The first value in the “thickness” parameter column of the first lens L1 is the thickness of the lens at the optical axis, and the second value is the distance from the image side of the lens to the next surface in the image side direction at the optical axis. The focal length, the material refractive index and the Abbe number are obtained by using visible light with a reference wavelength of 555 nm. The units of the Y radius, the thickness and the effective focal length are millimeters (mm).

[0101] Table 1a

[0102]

[0103] wherein F is the effective focal length of the optical system 10, FNO is the aperture number of the optical system 10, and FOV is the maximum field of view angle of the optical system 10.

[0104] In this embodiment, the object side and the image side of the second lens L2 are both aspheric surfaces, and the object side and the image side of the seventh lens L7 are both aspheric surfaces. The surface type x of the aspheric surface can be defined by, but is not limited to, the following aspheric surface formula:

[0105]

[0106] wherein x is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the vertex of the aspheric surface, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th high order term in the aspheric surface formula. Table 1b shows the high order term coefficients A4, A6, A8, A10, A12, A14, and A16 of the aspheric surfaces S3, S4, S13, and S14 that can be used in the first embodiment.

[0107] Table 1b

[0108]

[0109] Figure 2 Fig. 1(a) shows the longitudinal spherical aberration curves of the optical system 10 in the first embodiment at wavelengths of 660.0000 nm, 610.0000 nm, 555.0000 nm, 510.0000 nm, and 455.0000 nm, wherein the abscissa along the X-axis direction represents the focal shift, i.e., the distance from the imaging plane to the intersection of the optical axis and the light ray (in mm), and the ordinate along the Y-axis direction represents the normalized field of view. The longitudinal spherical aberration curve represents the convergence focal shift of the light rays at different wavelengths after passing through each lens of the optical system 10. From Figure 2 As can be seen from Fig. 1(a), the convergence focal shift of the light rays at different wavelengths in the first embodiment tends to be consistent, and the dispersion spot or color fringe in the imaging image is effectively suppressed, which indicates that the imaging quality of the optical system 10 in the embodiment is good.

[0110] Figure 2 Fig. 1(b) also shows the astigmatism curves of the optical system 10 in the first embodiment at a wavelength of 555.0000 nm, wherein the abscissa along the X-axis direction represents the focal shift, and the ordinate along the Y-axis direction represents the field of view angle (in deg). The S curve in the astigmatism curve represents the sagittal field curvature at 555.0000 nm, and the T curve represents the tangential field curvature at 555.0000 nm. From Figure 2 As can be seen from Fig. 1(b), the field curvature of the optical system 10 is small, and the field curvature and astigmatism of each field of view are well corrected, and the center and edge of the field of view have clear imaging.

[0111] Figure 2 Fig. 1(c) also shows the distortion curve of the optical system 10 in the first embodiment at a wavelength of 555.0000 nm. The abscissa along the X-axis direction represents the distortion value, and the ordinate along the Y-axis direction represents the field of view angle (in deg). The distortion curve represents the distortion size value corresponding to different field of view angles. From Figure 2 As can be seen from Fig. 1(c), the image distortion caused by the chief ray at a wavelength of 555.0000 nm is small, and the imaging quality of the system is excellent.

[0112] By Figure 2 In (a), Figure 2 In (b), and Figure 3 As can be seen from the above, the optical system 10 of the present embodiment has small aberration and good imaging quality, and has good imaging performance.

[0113] Second embodiment

[0114] Please refer to Figure 4 The optical system 10 of the present embodiment comprises, in order from the object side to the image side along the optical axis direction:

[0115] The first lens L1 has negative refractive power, and the object side surface S1 of the first lens L1 is concave at the vicinity of the optical axis, and the image side surface S2 is concave at the vicinity of the optical axis.

[0116] The second lens L2 has positive refractive power, and the object side surface S3 of the second lens L2 is convex at the vicinity of the optical axis, and the image side surface S4 is convex at the vicinity of the optical axis.

[0117] The third lens L3 has positive refractive power, and the object side surface S5 of the third lens L3 is convex at the vicinity of the optical axis, and the image side surface S6 is convex at the vicinity of the optical axis.

[0118] The fourth lens L4 has positive refractive power, and the object side surface S7 of the fourth lens L4 is convex at the vicinity of the optical axis, and the image side surface S8 is convex at the vicinity of the optical axis.

[0119] The fifth lens L5 has negative refractive power, and the object side surface S9 of the fifth lens L5 is concave at the vicinity of the optical axis, and the image side surface S10 is concave at the vicinity of the optical axis.

[0120] The sixth lens L6 has positive refractive power, and the object side surface S11 of the sixth lens L6 is convex at the vicinity of the optical axis, and the image side surface S12 is concave at the vicinity of the optical axis.

[0121] The seventh lens L7 has positive refractive power, and the object side surface S13 of the seventh lens L7 is concave at the vicinity of the optical axis, and the image side surface S14 is convex at the vicinity of the optical axis.

[0122] The other structures of the second embodiment are the same as those of the first embodiment, and reference can be made.

[0123] Table 2a shows the parameters of the optical system 10 of the present embodiment, and the meanings of the parameters are the same as those of the first embodiment.

[0124] Table 2a

[0125]

[0126] Table 2b gives the higher-order coefficients that can be used for each aspherical mirror in the second embodiment, wherein each aspherical surface shape can be defined by the formula given in the first embodiment.

[0127] Table 2b

[0128]

[0129]

[0130] Figure 4 (a) Figure 4 (b) Figure 4 Image (c) shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system 10 of the second embodiment. The longitudinal spherical aberration curve represents the deviation of the converging focal point of light rays of different wavelengths after passing through the lenses of the optical system 10; the astigmatism curve represents the meridional field curvature and sagittal field curvature; and the distortion curve represents the distortion magnitude corresponding to different field of view angles. Figure 5 As can be seen from the aberration diagram, the longitudinal spherical aberration, field curvature, and distortion of the optical system 10 are all well controlled, thus the optical system 10 of this embodiment has good imaging quality.

[0131] Third Embodiment

[0132] Please refer to Figure 6 The optical system 10 of this embodiment includes, from the object side to the image side along the optical axis:

[0133] The first lens L1 has negative refractive power. The object side S1 of the first lens L1 is concave near the optical axis, and the image side S2 is concave near the optical axis.

[0134] The second lens L2 has positive refractive power. The object side S3 of the second lens L2 is convex near the optical axis, and the image side S4 is convex near the optical axis.

[0135] The third lens L3 has positive refractive power. The object side S5 of the third lens L3 is convex near the optical axis, and the image side S6 is convex near the optical axis.

[0136] The fourth lens L4 has positive refractive power. The object side S7 of the fourth lens L4 is convex near the optical axis, and the image side S8 is convex near the optical axis.

[0137] The fifth lens L5 has negative refractive power. The object side S9 of the fifth lens L5 is concave near the optical axis, and the image side S10 is concave near the optical axis.

[0138] The sixth lens L6 has positive refractive power. The object side S11 of the sixth lens L6 is convex near the optical axis, and the image side S12 is concave near the optical axis.

[0139] The seventh lens L7 has negative refractive power. The object side S13 of the seventh lens L7 is concave near the optical axis, and the image side S14 is convex near the optical axis.

[0140] The other structures of the third embodiment are the same as those of the first embodiment, and can be referred to accordingly.

[0141] Table 3a shows the parameters of the optical system 10 in this embodiment. The meanings of each parameter are the same as those in the first embodiment.

[0142] Table 3a

[0143]

[0144]

[0145] Table 3b gives the higher-order coefficients that can be used for each aspherical mirror in the third embodiment, wherein each aspherical surface shape can be defined by the formula given in the first embodiment.

[0146] Table 3b

[0147]

[0148] Figure 6 (a) Figure 6 (b) Figure 6 Image (c) shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system 10 of the third embodiment. The longitudinal spherical aberration curve represents the deviation of the converging focal point of light rays of different wavelengths after passing through the lenses of the optical system 10; the astigmatism curve represents the meridional field curvature and sagittal field curvature; and the distortion curve represents the distortion magnitude corresponding to different field angles. Figure 7 As can be seen from the aberration diagram, the longitudinal spherical aberration, field curvature, and distortion of the optical system 10 are all well controlled, thus the optical system 10 of this embodiment has good imaging quality.

[0149] Fourth embodiment

[0150] Please refer to Figure 8 The optical system 10 of this embodiment includes, from the object side to the image side along the optical axis:

[0151] The first lens L1 has negative refractive power. The object side S1 of the first lens L1 is concave near the optical axis, and the image side S2 is concave near the optical axis.

[0152] The second lens L2 has positive refractive power. The object side S3 of the second lens L2 is convex near the optical axis, and the image side S4 is convex near the optical axis.

[0153] The third lens L3 has positive refractive power, the object side S5 of the third lens L3 is convex at the near optical axis, and the image side S6 of the third lens L3 is convex at the near optical axis.

[0154] The fourth lens L4 has positive refractive power, the object side S7 of the fourth lens L4 is convex at the near optical axis, and the image side S8 of the fourth lens L4 is convex at the near optical axis.

[0155] The fifth lens L5 has negative refractive power, the object side S9 of the fifth lens L5 is concave at the near optical axis, and the image side S10 of the fifth lens L5 is concave at the near optical axis.

[0156] The sixth lens L6 has positive refractive power, the object side S11 of the sixth lens L6 is convex at the near optical axis, and the image side S12 of the sixth lens L6 is concave at the near optical axis.

[0157] The seventh lens L7 has positive refractive power, the object side S13 of the seventh lens L7 is concave at the near optical axis, and the image side S14 of the seventh lens L7 is convex at the near optical axis.

[0158] The other structures of the fourth embodiment are the same as those of the first embodiment, and thus are not described herein.

[0159] Table 4a shows the parameters of the optical system 10 of the fourth embodiment, and the meanings of the parameters are the same as those of the first embodiment.

[0160] Table 4a

[0161]

[0162] Table 4b shows the high-order term coefficients of the aspherical surfaces in the fourth embodiment, wherein the aspherical surface types can be defined by the formulas given in the first embodiment.

[0163] Table 4b

[0164]

[0165] Figure 8 Figures (a), Figure 8 Figures (b), Figure 8 Figures (c) show the longitudinal spherical aberration curve, the astigmatism curve and the distortion curve of the optical system 10 of the fourth embodiment, respectively, wherein the longitudinal spherical aberration curve represents the deviation of the converging focal points of light rays of different wavelengths after passing through the lenses of the optical system 10; the astigmatism curve represents the meridional field curvature and the sagittal field curvature; and the distortion curve represents the distortion values corresponding to different field angles. It can be seen from the aberration graphs in Figures Figure 9 that the longitudinal spherical aberration, the field curvature and the distortion of the optical system 10 are well controlled, so that the optical system 10 of the embodiment has good imaging quality.

[0166] Fifth Embodiment

[0167] Reference is made to Figure 10 The optical system 10 of the present embodiment comprises, in order from the object side to the image side along the optical axis direction:

[0168] The first lens L1 has a negative refractive power, the object side surface S1 of the first lens L1 is concave at the vicinity of the optical axis, and the image side surface S2 of the first lens L1 is concave at the vicinity of the optical axis.

[0169] The second lens L2 has a positive refractive power, the object side surface S3 of the second lens L2 is convex at the vicinity of the optical axis, and the image side surface S4 of the second lens L2 is convex at the vicinity of the optical axis.

[0170] The third lens L3 has a positive refractive power, the object side surface S5 of the third lens L3 is convex at the vicinity of the optical axis, and the image side surface S6 of the third lens L3 is convex at the vicinity of the optical axis.

[0171] The fourth lens L4 has a positive refractive power, the object side surface S7 of the fourth lens L4 is convex at the vicinity of the optical axis, and the image side surface S8 of the fourth lens L4 is convex at the vicinity of the optical axis.

[0172] The fifth lens L5 has a negative refractive power, the object side surface S9 of the fifth lens L5 is concave at the vicinity of the optical axis, and the image side surface S10 of the fifth lens L5 is concave at the vicinity of the optical axis.

[0173] The sixth lens L6 has a positive refractive power, the object side surface S11 of the sixth lens L6 is convex at the vicinity of the optical axis, and the image side surface S12 of the sixth lens L6 is concave at the vicinity of the optical axis.

[0174] The seventh lens L7 has a negative refractive power, the object side surface S13 of the seventh lens L7 is concave at the vicinity of the optical axis, and the image side surface S14 of the seventh lens L7 is convex at the vicinity of the optical axis.

[0175] The other structures of the fifth embodiment are the same as those of the first embodiment, and reference can be made thereto.

[0176] Table 5a shows the parameters of the optical system 10 of the present embodiment, and the meanings of the parameters are the same as those of the first embodiment.

[0177] Table 5a

[0178]

[0179]

[0180] Table 5b gives the high-order term coefficients of the aspherical surfaces that can be used in the fifth embodiment, wherein the aspherical surface types can be defined by the formulas given in the first embodiment.

[0181] Table 5b

[0182]

[0183] Figure 10In the middle (a), Figure 10 In the middle (b), Figure 10 In the middle (c), the longitudinal spherical aberration curve, the astigmatism curve and the distortion curve of the optical system 10 of the fifth embodiment are shown respectively, wherein the longitudinal spherical aberration curve represents the convergence focus point deviation of light rays of different wavelengths after passing through each lens of the optical system 10; the astigmatism curve represents the meridional field curvature and the sagittal field curvature; the distortion curve represents the distortion size value corresponding to different field angles. It can be seen from the aberration diagram in the middle (c) that the longitudinal spherical aberration, the field curvature and the distortion of the optical system 10 are well controlled, so that the optical system 10 of this embodiment has good imaging quality. Figure 11 In the middle (c), the longitudinal spherical aberration curve, the astigmatism curve and the distortion curve of the optical system 10 of the fifth embodiment are shown respectively, wherein the longitudinal spherical aberration curve represents the convergence focus point deviation of light rays of different wavelengths after passing through each lens of the optical system 10; the astigmatism curve represents the meridional field curvature and the sagittal field curvature; the distortion curve represents the distortion size value corresponding to different field angles. It can be seen from the aberration diagram in the middle (c) that the longitudinal spherical aberration, the field curvature and the distortion of the optical system 10 are well controlled, so that the optical system 10 of this embodiment has good imaging quality.

[0184] Table 6 shows the values of FNO, FOV, TTL / F, CTMAX / CTMIN, TTL / IMGH, SD1 / SD14, TTL / D1, BFL / F, R3 / F, F1 / CT1, F4 / CT4, F45 / (CT4+CT5), R9 / R10, F6 / F, CT3 / ET3, |(R5-R6) / (R5+R6)|, F3 / F, (SAG13+SAG14) / CT7, R14 / R13, SAG13 / SAG14, TTLxIMGH / F, IMGH / (Fxtan(FOV / 2)), FOV / F, F / IMGH, FOV / FNO, F1 / F, F2 / F, F4 / F, F5 / F, |F7 / F|, R1 / R2, R3 / R4, R5 / R6, R7 / R8, R11 / R12 and R13 / R14 in the optical system 10 of the first embodiment to the fifth embodiment.

[0185] Table 6

[0186]

[0187]

[0188] From Table 6, it is known that the optical systems of the first to fifth embodiments satisfy the following relational expressions: 1.65 ≤ FNO ≤ 1.75, 34 deg ≤ FOV ≤ 50 deg, 2.2 ≤ TTL / F ≤ 3.1, 3.6 ≤ CTMAX / CTMIN ≤ 6, 6 ≤ TTL / IMGH ≤ 8.5, 1.2 ≤ SD1 / SD14 ≤ 1.8, 4.7 ≤ TTL / D1 ≤ 6.7, 0.15 ≤ BFL / F ≤ 0.3, 1 ≤ R3 / F ≤ 1.3, -5 ≤ F1 / CT1 ≤ -3, 2.2 ≤ F4 / CT4 ≤ 2.9, -12 ≤ F45 / (CT4+CT5) ≤ -3, -4.5 ≤ R9 / R10 ≤ -1.5, 1.5 ≤ F6 / F ≤ 2.7, 2 ≤ CT3 / ET3 ≤ 3.4, 3 ≤ |(R5-R6) / (R5+R6)| ≤ 150, 1.7 ≤ F3 / F ≤ 2, -2.5 ≤ (SAG13+SAG14) / CT7 ≤ -1, 0.5 ≤ R14 / R13 ≤ 5, 0.6 ≤ SAG13 / SAG14 ≤ 2.8, 10 mm ≤ TTLxIMGH / F ≤ 15 mm, 0.93 ≤ IMGH / (Fxtan(FOV / 2)) ≤ 1.01, 2.3 deg / mm ≤ FOV / F ≤ 4 deg / mm, 2.2 ≤ F / IMGH ≤ 3.3, 20 ≤ FOV / FNO ≤ 29, -1.4 ≤ F1 / F ≤ -1.1, 1.3 ≤ F2 / F ≤ 1.6, 0.8 ≤ F4 / F ≤ 1, -0.6 ≤ F5 / F ≤ -0.4, 1 ≤ |F7 / F| ≤ 12, R1 / R2 ≥ -2, -0.3 ≤ R3 / R4 ≤ -0.15, -1.1 ≤ R5 / R6 ≤ -0.5, -0.8 ≤ R7 / R8 ≤ -0.4, 0.2 ≤ R11 / R12 ≤ 0.9, and 0.2 ≤ R13 / R14 ≤ 1.8.

[0189] Referring to Figure 12The application further provides a camera module 20, which comprises a photosensitive chip 21 and the optical system 10 according to any one of the above embodiments, and the photosensitive chip 21 is arranged on the image side of the optical system 10. The photosensitive surface of the photosensitive chip 21 is located on the imaging surface of the optical system 10, and the light rays of an object incident on the photosensitive surface through the lens can be converted into an image electrical signal. The photosensitive chip 21 can be a complementary metal oxide semiconductor (CMOS) or a charge-coupled device (CCD). The camera module 20 can be an imaging module integrated on an electronic device 30, or can be a separate lens. By adding the optical system 10 provided by the application to the camera module 20, the camera module 20 has the characteristics of a large aperture, high relative luminance and a large field of view by reasonably designing the surface shape and refractive power of each lens in the optical system 10.

[0190] Please refer to ​ The application further provides an electronic device 30, which comprises a shell 31 and the camera module 20 described above, and the camera module 20 is arranged in the shell 31. The electronic device 30 includes but is not limited to a car, a monitoring device, a smart phone, a computer, a smart watch and the like. By adding the camera module 20 provided by the application to the electronic device 30, the electronic device 30 has the characteristics of a large aperture, high relative luminance and a large field of view.

[0191] The above only discloses some preferred embodiments of the application, and of course cannot limit the scope of the application, and those skilled in the art can understand that all or part of the above processes can be implemented, and equivalent changes made according to the claims of the application still belong to the scope of the application.

Claims

1. An optical system characterized by comprising: There are seven lenses with refractive power, sequentially comprising, along the optical axis from the object side to the image side: a first lens with negative refractive power, the object side surface of the first lens is concave at the near optical axis, the image side surface of the first lens is concave at the near optical axis; a second lens with positive refractive power, the object side surface of the second lens is convex at the near optical axis, the image side surface of the second lens is convex at the near optical axis; a third lens with positive refractive power, the object side surface of the third lens is convex at the near optical axis, the image side surface of the third lens is convex at the near optical axis; a fourth lens with positive refractive power, the object side surface of the fourth lens is convex at the near optical axis, the image side surface of the fourth lens is convex at the near optical axis; a fifth lens with negative refractive power, the object side surface of the fifth lens is concave at the near optical axis, the image side surface of the fifth lens is concave at the near optical axis; a sixth lens with positive refractive power, the object side surface of the sixth lens is convex at the near optical axis, the image side surface of the sixth lens is concave at the near optical axis; a seventh lens with refractive power, the object side surface of the seventh lens is concave at the near optical axis, the image side surface of the seventh lens is convex at the near optical axis; The optical system satisfies the relationship: 1.65≤FNO≤1.75, 34deg≤FOV≤50deg; 0.5≤R14 / R13≤5; 10mm≤TTL×IMGH / F≤15mm; Wherein, FNO is the aperture number of the optical system, FOV is the maximum field of view angle of the optical system, R13 is the radius of curvature of the object side surface of the seventh lens at the optical axis, R14 is the radius of curvature of the image side surface of the seventh lens at the optical axis, TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, IMGH is half of the image height corresponding to the maximum field of view angle of the optical system, F is the effective focal length of the optical system.

2. The optical system of claim 1, wherein, The optical system satisfies the relationship: 2.2≤TTL / F≤3.1; and / or, 3.6≤CTMAX / CTMIN≤6; and / or, 6≤TTL / IMGH≤8.5; Wherein, TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, F is the effective focal length of the optical system, CTMAX is the maximum value of the thickness on the optical axis of the first lens to the seventh lens, CTMIN is the minimum value of the thickness on the optical axis of the first lens to the seventh lens, IMGH is half of the image height corresponding to the maximum field of view angle of the optical system.

3. The optical system of claim 1, wherein, The optical system satisfies the relationship: 1.2≤SD1 / SD14≤1.8; and / or, 4.7≤TTL / D1≤6.7; and / or, 0.15≤BFL / F≤0.3; Wherein, SD1 is half of the maximum effective aperture of the object side of the first lens, SD14 is half of the maximum effective aperture of the image side of the seventh lens, TTL is the distance from the object side of the first lens to the imaging surface on the optical axis of the optical system, D1 is half of the maximum effective aperture of the object side and the image side of the first lens, BFL is the distance from the image side of the seventh lens to the imaging surface of the optical system on the optical axis, and F is the effective focal length of the optical system.

4. The optical system of claim 1, wherein, The optical system satisfies the relationship: 1≤R3 / F≤1.3; and / or, -5≤F1 / CT1≤-3; and / or, 2.2≤F4 / CT4≤2.9; Wherein, R3 is the radius of curvature of the object side of the second lens at the optical axis, F is the effective focal length of the optical system, F1 is the effective focal length of the first lens, CT1 is the thickness of the first lens on the optical axis, F4 is the effective focal length of the fourth lens, and CT4 is the thickness of the fourth lens on the optical axis.

5. The optical system of claim 1, wherein, The optical system satisfies the relationship: -12≤F45 / (CT4+CT5)≤-3; and / or, -4.5≤R9 / R10≤-1.5; and / or, 1.5≤F6 / F≤2.7; Wherein, F45 is the combined effective focal length of the fourth lens and the fifth lens, CT4 is the thickness of the fourth lens on the optical axis, CT5 is the thickness of the fifth lens on the optical axis, R9 is the radius of curvature of the object side of the fifth lens at the optical axis, R10 is the radius of curvature of the image side of the fifth lens at the optical axis, F6 is the effective focal length of the sixth lens, and F is the effective focal length of the optical system.

6. The optical system of claim 1, wherein, The optical system satisfies the relationship: 2≤CT3 / ET3≤3.4; and / or, 3≤|(R5-R6) / (R5+R6)|≤150; and / or, 1.7≤F3 / F≤2; Wherein, CT3 is the thickness of the third lens on the optical axis, ET3 is the edge thickness of the third lens, R5 is the radius of curvature of the object side of the third lens at the optical axis, R6 is the radius of curvature of the image side of the third lens at the optical axis, F3 is the effective focal length of the third lens, and F is the effective focal length of the optical system.

7. The optical system of claim 1, wherein, The optical system satisfies the relationship: -2.5≤(SAG13+SAG14) / CT7≤-1; and / or, 0.6≤SAG13 / SAG14≤2.8; Wherein, SAG13 is the sagittal height of the object side of the seventh lens at the maximum effective aperture, SAG14 is the sagittal height of the image side of the seventh lens at the maximum effective aperture, and CT7 is the thickness of the seventh lens on the optical axis.

8. The optical system of claim 1, wherein, The optical system satisfies the relationship: 0.93≤IMGH / (F×tan(FOV / 2))≤1.01; and / or, 2.3deg / mm≤FOV / F≤4deg / mm; Wherein, TTL is the distance from the object side of the first lens to the imaging surface on the optical axis, IMGH is half of the image height corresponding to the maximum field of view angle of the optical system, and F is the effective focal length of the optical system.

9. An image capture module, comprising: The optical system and the photosensitive chip according to any one of claims 1 to 8 are arranged on an image side of the optical system.

10. An electronic device, comprising: The electronic device comprises a shell and the camera module according to claim 9, and the camera module is arranged in the shell.

Images