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, the second lens, the third lens, the fourth lens and the sixth lens having positive refractive power, and the seventh lens having positive refractive power or negative refractive power, wherein the object side surface of the first lens, the object side surface and the image side surface of the fifth lens, and the image side surface of the sixth lens are all concave at a near optical axis, and the image side surface of the first lens, 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, and the object side surface of the sixth 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 beneficial to meet the characteristics of higher imaging clarity, larger field of view and miniaturization.

Description

TECHNICAL FIELD

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

[0002] With the rapid development of the automobile industry and the continuous evolution of automatic driving technology, the performance of the vehicle-mounted lens directly affects the reliability and accuracy of the driving assistance system and the automatic driving system. Among many vehicle-mounted lens application scenarios, the front-view lens undertakes key tasks such as target detection, obstacle recognition, lane line tracking, etc., which are crucial to ensuring driving safety.

[0003] On the one hand, the vehicle-mounted lens is required to have a field of view angle that can balance the accurate detection of long-distance targets and the capture of nearby key information, and the vehicle-mounted lens is required to have a large field of view angle. On the other hand, as the level of automatic driving improves, the size of the image plane of the photosensitive chip is required to be larger and larger to obtain more image details. In addition, due to the limited installation space of the vehicle-mounted system, the vehicle-mounted lens needs to meet the requirement of miniaturization in design. SUMMARY

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

[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 a total of 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 being concave at the vicinity of the optical axis, and the image side surface of the first lens being convex at the vicinity of the optical axis; a second lens with negative refractive power, 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; a third lens with positive refractive power, 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; a fourth lens with positive refractive power, the object side surface of the fourth lens being convex at the vicinity of the optical axis, and the image side surface of the fourth lens being convex at the vicinity of the optical axis; a fifth lens with positive refractive power, the object side surface of the fifth lens being concave at the vicinity of the optical axis, and the image side surface of the fifth lens being concave at the vicinity of the optical axis; a sixth lens with positive refractive power, 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; and a seventh lens with positive refractive power or negative refractive power, the object side surface of the seventh lens can be convex, concave or flat at the vicinity of the optical axis, and the image side surface of the seventh lens can be convex, concave or flat at the vicinity of the optical axis.

[0007] The optical system satisfies a relationship: 30deg≤FOV≤50deg, 7.1≤TTL / IMGH≤7.5; wherein, FOV is a maximum field of view angle of the optical system, TTL is a distance from an object side of the first lens to an imaging surface on an optical axis, and IMGH is a half of an image height corresponding to the maximum field of view angle of the optical system.

[0008] By making the first lens have negative refractive power, and the object side of the first lens being concave at the near optical axis, and the image side of the first lens being convex at the near optical axis, the light rays are beneficially diverged, and the light rays exiting the image side of the first lens can make the subsequent optical system have a larger light ray acceptance surface, thereby reducing the front aperture; by making the second lens have positive refractive power, and the object side of the second lens being convex at the near optical axis, and the image side of the second lens being convex at the near optical axis, the light rays are beneficially converged, and in combination with the first lens having negative focal power, the total length of the fixed focus lens can be reduced, and the converging effect of the light rays can further reduce the rear aperture; by making the third lens have positive refractive power, and the object side of the third lens being convex at the near optical axis, and the image side of the third lens being convex at the near optical axis, the light rays converging from the second lens are beneficially accepted, the height of the light beam incident to the object side of the fourth lens is reduced, the object side aperture of the fourth lens is reduced, and the aperture stop aberration is corrected; by making the fourth lens have positive refractive power, and the object side of the fourth lens being convex at the near optical axis, and the image side of the fourth lens being convex at the near optical axis, the angle between the incident light rays of the edge field of view and the surface normal of the object side is reduced, and the light rays are prevented from diverging; by making the fifth lens have negative refractive power, and the object side of the fifth lens being concave at the near optical axis, and the image side of the fifth lens being concave at the near optical axis, the incident light rays are beneficially diverged, and the light rays are smoothly transitioned to the optical system on the image side of the fifth lens; by making the sixth lens have positive refractive power, and the object side of the sixth lens being convex at the near optical axis, and the image side of the sixth lens being concave at the near optical axis, the light rays are smoothly incident to the seventh lens, and the sensitivity of the fixed focus lens is reduced.

[0009] By making the optical system satisfy the relationship: 30deg≤FOV≤50deg, the maximum field of view angle of the optical system is controlled within a reasonable range, excessive aberration is avoided, and the optical system is beneficially small in size while having sufficient field of view.

[0010] By making the optical system satisfy the relationship: 7.1≤TTL / IMGH≤7.5, the ratio of the total length of the optical system to the image height is reasonably configured, and in combination with the range of the maximum field of view angle of the optical system, the total length of the optical system is beneficially limited, and the optical system is small in size.

[0011] In an embodiment, the optical system satisfies a relationship: 2.2≤TTL / F≤3.1; where F is an effective focal length of the optical system. By causing the optical system to satisfy the above relationship, a ratio of a distance from the object side surface of the first lens to an 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 a miniaturization characteristic is achieved.

[0012] In an embodiment, the optical system satisfies a relationship: 2.9≤SD1 / IMGH / Tan(FOV / 2)≤4.2; where SD1 is half of a maximum effective aperture of the object side surface of the first lens. By causing the optical system to satisfy the above relationship, a balance between a front end aperture size of the optical system and a field of view and an image surface is ensured, and resolution is improved.

[0013] In an embodiment, the optical system satisfies a relationship: 20deg≤FOV / FNO≤30deg; where FNO is an aperture number of the optical system. By causing the optical system to satisfy the above relationship, a ratio of the field of view and the aperture number of the optical system is reasonably configured, so that the optical system has a combination effect of a larger field of view and a large aperture, the optical system has a reasonable amount of light, the overall illumination of an imaging picture is improved, and the optical system is suitable for different lighting environments.

[0014] In an embodiment, the optical system satisfies a relationship: 1.4≤CT2 / CT1≤3.1; where CT1 is a thickness of the first lens on the optical axis, and CT2 is a thickness of the second lens on the optical axis. By causing the optical system to satisfy the above relationship, a ratio of the thickness of the first lens on the optical axis and the thickness of the second lens on the optical axis is reasonably configured, and the first lens and the second lens can be mutually regulated, so that a miniaturization characteristic of the optical system is maintained.

[0015] In an embodiment, the optical system satisfies a relationship: -2.2≤F1 / F≤-1.4; where F is an effective focal length of the optical system, and F1 is an effective focal length of the first lens. By causing the optical system to satisfy the above relationship, the refractive power of the first lens in the optical system is properly matched, the surface type design of the first lens is more simple and flexible, and the optical system is also beneficial to divergent light rays, so that the light rays emitted from the image side surface of the first lens can have a larger light receiving surface of the subsequent optical system, and the balance between aberration correction and imaging quality of the overall optical system is simplified.

[0016] In an embodiment, the optical system satisfies a relationship: 1.4≤F2 / F≤1.92; wherein F2 is an effective focal length of the second lens. By causing the optical system to 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 optical system as a whole is simplified.

[0017] In an embodiment, the optical system satisfies a relationship: 4.5≤R2 / R1≤10; wherein R1 is a curvature radius of an object side surface of the first lens at the optical axis, and R2 is a curvature radius of an image side surface of the first lens at the optical axis. By causing the optical system to satisfy the above relationship, the ratio of the curvature radius of the image side surface of the first lens at the optical axis to the curvature radius of the object side surface of the first lens at the optical axis is properly configured, the shape of the first lens is controlled, the balance between the spherical aberration, the chromatic aberration and the field curvature of the optical system is comprehensively balanced, the risk of ghosting is reduced, the resolving power of the optical system is improved, and the processing difficulty of the first lens is reduced.

[0018] In an embodiment, the optical system satisfies a relationship: 1≤|(R5-R6) / (R5+R6)|≤45; wherein R5 is a curvature radius of an object side surface of the third lens at the optical axis, and R6 is a curvature radius of an image side surface of the third lens at the optical axis. By causing the optical system to satisfy the above relationship, the incident light in front is collected and compressed, the light is smoothly transitioned to the optical system in the rear, the aberration correction pressure of the lens at the rear end of the optical system is reduced, and the diaphragm aberration is corrected.

[0019] In an embodiment, the optical system satisfies a relationship: 0.4≤(R13-R14) / (R13+R14)≤1.4; wherein R13 is a curvature radius of an object side surface of the seventh lens at the optical axis, and R14 is a curvature radius of an image side surface of the seventh lens at the optical axis. By causing the optical system to satisfy the above relationship, the shape of the seventh lens is controlled, the balance between the spherical aberration, the chromatic aberration and the field curvature of the optical system is comprehensively balanced, the risk of ghosting is reduced, and the resolving power of the optical system is improved.

[0020] In an embodiment, the optical system satisfies a relationship: 3≤F2 / CT2≤3.9; wherein F2 is an effective focal length of the second lens, and CT2 is a thickness of the second lens on the optical axis. By causing the optical system to satisfy the above relationship, the ratio of the effective focal length of the second lens to the thickness of the second lens on the optical axis is properly configured, and the surface design of the second lens is simplified.

[0021] In an embodiment, the optical system satisfies a relationship: -5≤F5 / CT5≤-2; where F5 is an effective focal length of 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, a ratio of the effective focal length of the fifth lens and the thickness of the fifth lens on the optical axis is reasonably configured, which is conducive to simplifying the surface configuration of the fifth lens.

[0022] In an embodiment, the optical system satisfies a relationship: 0.6≤CT1 / ET1≤0.8; where CT1 is a thickness of the first lens on the optical axis, and ET1 is an edge thickness of the first lens, i.e., a distance from a maximum effective aperture of the object side to a maximum effective aperture of the image side of the first lens in a direction parallel to the optical axis. By causing the optical system to satisfy the above relationship, a ratio of the thickness of the first lens on the optical axis and the edge thickness of the first lens is reasonably configured, which is conducive to simplifying the production and manufacturing of the first lens.

[0023] In an embodiment, the optical system satisfies a relationship: 0.12≤(CT4+CT5) / TTL≤0.24; where CT4 is a thickness of the fourth lens on the optical axis, and CT5 is a thickness of the fifth lens on the optical axis. By causing the optical system to satisfy the above relationship, the fourth lens and the fifth lens are conducive to enhancing the ability to regulate light, and are conducive to regulating more light into the rear system to improve the relative illumination.

[0024] In an embodiment, the optical system satisfies a relationship: -1.5≤(VD4-VD5) / F45≤-0.3; where VD4 is an Abbe number of the fourth lens, VD5 is an Abbe number of the fifth lens, and F45 is a combined effective focal length of the fourth lens and the fifth lens. By causing the optical system to satisfy the above relationship, a ratio of the Abbe number difference of the fourth lens and the fifth lens and the combined effective focal length of the fourth lens and the fifth lens is reasonably configured, which is conducive to correcting chromatic aberration of the optical system, restoring the authenticity of colors, and improving imaging quality.

[0025] In an embodiment, the optical system satisfies a relationship: 0.3≤CT5 / CT4≤1.1; where CT5 is a thickness of the fifth lens on the optical axis, and CT4 is a thickness of the fourth lens on the optical axis. By causing the optical system to satisfy the above relationship, a ratio of the thickness of the fifth lens on the optical axis and the thickness of the fourth lens on the optical axis is reasonably configured, and the fifth lens and the fourth lens can regulate each other while maintaining the characteristics of miniaturization of the optical system.

[0026] In an embodiment, the optical system satisfies a relationship: 0.4≤R11 / (R12+CT6)≤0.75; where R11 is a radius of curvature of an object side surface of the sixth lens at the optical axis, R12 is a radius of curvature of an image side surface of the sixth lens at the optical axis, and CT6 is a thickness of the sixth lens on the optical axis. 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, which is conducive to making the shape of the sixth lens close to a concentric circle, is conducive to smooth transition of the light ray to the seventh lens, and reduces light energy loss.

[0027] In an embodiment, the optical system satisfies a relationship: -3.5≤CT1 / SAG1≤-1.5; where CT1 is a thickness of the first lens on the optical axis, and SAG1 is a sagitta of the object side surface of the first lens at a maximum effective aperture. By causing the optical system to satisfy the above relationship, the refractive power and thickness of the first lens at each position perpendicular to the optical axis are reasonably controlled, which avoids the first lens being too thick or too thin, and reduces the tolerance sensitivity of the optical system.

[0028] In an embodiment, the optical system satisfies a relationship: 1.2≤SD1 / IMGH≤1.3; where SD1 is half of the maximum effective aperture of the object side surface of the first lens. By causing the optical system to satisfy the above relationship, the ratio of half of the maximum effective aperture of the object side surface of the first lens and half of the image height corresponding to the maximum field angle of the optical system is reasonably configured, which is conducive to reasonably controlling the size of the object side surface of the first lens and realizing miniaturization of the optical system.

[0029] In an embodiment, the optical system satisfies a relationship: 28≤180*TTL / IMGH / FOV≤39. By causing the optical system to satisfy the above relationship, the optical system is balanced between large image height, long focal length and miniaturization, and the market demand for large target surface and miniaturization is met at the same time.

[0030] In an embodiment, the optical system satisfies a relationship: 0.95≤IMGH / (F*Tan(FOV / 2))≤1.1; where F is an effective focal length of the optical system. By causing the optical system to satisfy the above relationship, the optical distortion of the optical system can be controlled within a smaller range, which is conducive to improving the imaging quality of the optical system.

[0031] In an embodiment, the optical system satisfies a relationship: 0.3≤IMGH / F≤0.45. By causing the optical system to satisfy the above relationship, the ratio of half of the image height corresponding to the maximum field angle of the optical system and the effective focal length of the optical system is reasonably configured, which is conducive to the optical system achieving a larger imaging surface and improving the imaging quality of the optical system.

[0032] In a second aspect, the present application also provides a camera module, which comprises a photosensitive chip and the optical system according to any one of the first aspect. The photosensitive chip is arranged on the image side of the optical system. The photosensitive chip can be a complementary metal oxide semiconductor (CMOS) or a charge-coupled device (CCD). 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 camera module can be an imaging module integrated on an electronic device or a separate lens. By introducing the optical system provided by the present application into the camera module, the camera module has the characteristics of high imaging clarity, large field of view and miniaturization by reasonably configuring the surface shape and refractive power of each lens in the optical system.

[0033] In a third aspect, the present application also provides an electronic device, which comprises a housing and the camera module according to the second aspect. The camera module is arranged in the housing. The electronic device includes but is not limited to a car, a monitoring device, a smart phone, a smart watch, a computer and the like. By adding the camera module provided by the present application to the electronic device, the electronic device has the characteristics of high imaging clarity, large field of view and miniaturization. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

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

[0036] Figure 2 shows the longitudinal spherical aberration curve, the astigmatism curve and the distortion curve of the optical system of the first embodiment;

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

[0038] Figure 4 shows the longitudinal spherical aberration curve, the astigmatism curve and the distortion curve of the optical system of the second embodiment;

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

[0040] Figure 6 Fig. 6 shows longitudinal spherical aberration, astigmatism and distortion curves of the optical system of the third embodiment;

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

[0042] Figure 8 Fig. 8 shows longitudinal spherical aberration, astigmatism and distortion curves of the optical system of the fourth embodiment;

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

[0044] Figure 10 Fig. 10 shows longitudinal spherical aberration, astigmatism and distortion curves of the optical system of the fifth embodiment;

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

[0046] Figure 12 Fig. 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 in combination with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0048] In a first aspect, the present application provides an optical system, which comprises seven lenses with refractive power, and sequentially comprises, 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 convex 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 or negative refractive power, the object side surface of the seventh lens can be convex, concave or flat at the vicinity of the optical axis, and the image side surface of the seventh lens can be convex, concave or flat at the vicinity of the optical axis.

[0049] The optical system satisfies the relationship: 30deg≤FOV≤50deg, 7.1≤TTL / IMGH≤7.5; wherein FOV is the maximum field of view of the optical system, TTL is the distance from the object side surface of the first lens to the image surface on the optical axis, and IMGH is half of the image height corresponding to the maximum field of view of the optical system. Specifically, the value of FOV can be 40deg, 35deg, 45deg, 32deg, 38deg, 42deg, 43deg, 31deg, etc. Specifically, the value of TTL / IMGH can be 7.108, 7.359, 7.386, 7.254, 7.373, 7.213, 7.492, 7.475, 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 convex at the near optical axis, the light rays can be diverged, and the light rays exiting the image side surface of the first lens can make the subsequent optical system have a larger light acceptance surface, and reduce the front aperture; 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, the light rays can be converged, and in combination with the first lens having negative focal power, the total length of the fixed focus lens can be reduced, and the converging effect on the light rays can further reduce the rear 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, the light rays converging from the second lens can be received, the height of the light beam incident to the object side surface of the fourth lens is reduced, the aperture of the object side surface of the fourth lens is reduced, and the diaphragm aberration is corrected; 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 fourth lens be convex at the near optical axis, the angle between the incident light rays of the edge field of view and the surface normal of the object side surface is reduced, and the light rays are prevented from diverging; by making the fifth lens have negative refractive power, and the object side surface of the fifth lens be concave at the near optical axis, and the image side surface of the fifth lens be concave at the near optical axis, the incident light rays of the object side surface of the fifth lens are effectively collected and compressed, and the light rays are smoothly transferred to the optical system of the image side surface of the fifth lens; 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, the light rays are smoothly incident to the seventh lens, and the sensitivity of the fixed focus lens is reduced.

[0051] By making the optical system satisfy the relationship: 30deg≤FOV≤50deg, the maximum field of view of the optical system is controlled within a reasonable range, excessive aberration is avoided, and the optical system is facilitated to obtain sufficient field of view while meeting the characteristics of miniaturization. More preferably, the optical system satisfies the relationship: 33deg≤FOV≤47deg.

[0052] By making the optical system satisfy the relationship: 7.1≤TTL / IMGH≤7.5, the ratio of the total length of the optical system to the image height is reasonably configured, and in combination with the range of the maximum field of view of the optical system, the total length of the optical system is limited, and the miniaturization of the optical system is achieved.

[0053] In an embodiment, the optical system satisfies a relationship: 2.2≤TTL / F≤3.1; where F is an effective focal length of the optical system. Specifically, the value of TTL / F can be 2.273, 2.569, 2.485, 2.954, 2.856, 2.746, 3.058, 3.086, 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 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, realizing the characteristics of miniaturization.

[0054] In an embodiment, the optical system satisfies a relationship: 2.9≤SD1 / IMGH / Tan(FOV / 2)≤4.2; where SD1 is half of the maximum effective aperture of the object side of the first lens. Specifically, the value of SD1 / IMGH / Tan(FOV / 2) can be 2.968, 3.489, 2.957, 3.247, 4.196, 4.013, 3.742, 3.854, etc. By making the optical system satisfy the above relationship, the balance between the front aperture size of the optical system and the field of view and the image surface is ensured, which is beneficial to improve the resolution.

[0055] In an embodiment, the optical system satisfies a relationship: 20deg≤FOV / FNO≤30deg; where FNO is the F number of the optical system. Specifically, the value of FOV / FNO can be 25.366deg, 29.609deg, 20.693deg, 26.694deg, 28.032deg, 20.925deg, 27.915deg, 23.854deg, etc. By making the optical system satisfy the above relationship, the ratio of the field of view and the F number of the optical system is reasonably configured, so that the optical system has a combination effect of a larger 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.

[0056] In an embodiment, the optical system satisfies a relationship: 1.4≤CT2 / CT1≤3.1; where CT1 is the thickness of the first lens on the optical axis, and CT2 is the thickness of the second lens on the optical axis. Specifically, the value of CT2 / CT1 can be 1.434, 2.149, 2.598, 2.654, 3.017, 1.854, 1.938, 3.041, etc. By making the optical system satisfy the above relationship, the ratio of the thickness of the first lens on the optical axis and the thickness of the second lens on the optical axis is reasonably configured, and the first lens and the second lens can regulate each other, maintaining the characteristics of miniaturization of the optical system.

[0057] In an embodiment, the optical system satisfies a relationship: -2.2≤F1 / F≤-1.4; where F is an effective focal length of the optical system, and F1 is an effective focal length of the first lens. Specifically, the value of F1 / F can be -1.358, -2.148, -1.951, -1.584, -1.743, -2.196, -1.852, -1.774, etc. By causing the optical system to satisfy the above relationship, the first lens is properly matched in terms of refractive power in the optical system, the surface shape design of the first lens is more simple and flexible, and the optical system is also beneficial for diverging light rays, which can make the subsequent optical system have a larger light acceptance surface, thereby simplifying the overall aberration correction and imaging quality balance of the optical system.

[0058] In an embodiment, the optical system satisfies a relationship: 1.4≤F2 / F≤1.92; where F is an effective focal length of the optical system, and F2 is an effective focal length of the second lens. Specifically, the value of F2 / F can be 1.851, 1.453, 1.746, 1.694, 1.832, 1.514, 1.639, 1.901, etc. By causing the optical system to satisfy the above relationship, the second lens is properly matched in terms of refractive power in the optical system, the surface shape design of the second lens is more simple and flexible, the aberration is reduced, and the overall aberration correction and imaging quality balance of the optical system are simplified.

[0059] In an embodiment, the optical system satisfies a relationship: 4.5≤R2 / R1≤10; where R1 is a curvature radius of an object side surface of the first lens at the optical axis, and R2 is a curvature radius of an image side surface of the first lens at the optical axis. Specifically, the value of R2 / R1 can be 4.695, 9.412, 8.651, 7.458, 6.574, 5.746, 8.541, 9.834, etc. By causing the optical system to satisfy the above relationship, the ratio of the curvature radius of the image side surface of the first lens at the optical axis to the curvature radius of the object side surface of the first lens at the optical axis is properly 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 also reduced.

[0060] In one embodiment, the optical system satisfies the relationship: 1≤|(R5-R6) / (R5+R6)|≤45; 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 1.641, 18.654, 20.913, 6.841, 43.985, 35.813, 36.712, 25.684, etc. By making the optical system satisfy the above relationship, it is beneficial to collect and compress the incident light in front, so that the light smoothly transitions into the optical system behind, reduces the aberration correction pressure of the lens at the rear end of the optical system, and at the same time, it is beneficial to correct the diaphragm aberration.

[0061] In one embodiment, the optical system satisfies the relationship: 0.4≤(R13-R14) / (R13+R14)≤1.4; 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 (R13-R14) / (R13+R14) can be 0.965, 1.204, 1.039, 0.854, 0.457, 0.712, 1.239, 1.386, etc. By making the optical system satisfy the above relationship, it is beneficial to control the shape of the seventh lens, comprehensively balance the spherical aberration, chromatic aberration and field curvature of the optical system, and reduce the risk of ghosting, and improve the resolving power of the optical system.

[0062] In one embodiment, the optical system satisfies the relationship: 3≤F2 / CT2≤3.9; wherein F2 is the effective focal length of the second lens, and CT2 is the thickness of the second lens on the optical axis. Specifically, the value of F2 / CT2 can be 3.146, 3.071, 3.241, 3.496, 3.385, 3.874, 3.086, 3.689, etc. By making the optical system satisfy the above relationship, the ratio of the effective focal length of the second lens and the thickness of the second lens on the optical axis is reasonably configured, which is beneficial to simplify the surface setting of the second lens.

[0063] In one embodiment, the optical system satisfies the relationship: -5≤F5 / CT5≤-2; wherein F5 is the effective focal length of the fifth lens, and CT5 is the thickness of the fifth lens on the optical axis. Specifically, the value of F5 / CT5 can be -4.965, -4.328, -3.656, -4.523, -3.854, -2.896, -2.075, -3.452, etc. By making the optical system satisfy the above relationship, the ratio of the effective focal length of the fifth lens and the thickness of the fifth lens on the optical axis is reasonably configured, which is beneficial to simplify the surface setting of the fifth lens.

[0064] In an embodiment, the optical system satisfies a relationship: 0.6≤CT1 / ET1≤0.8; wherein CT1 is a thickness of the first lens on the optical axis, and ET1 is an edge thickness of the first lens, i.e., a distance from a maximum effective aperture of the object side to a maximum effective aperture of the image side of the first lens in a direction parallel to the optical axis. Specifically, the value of CT1 / ET1 can be 0.782, 0.746, 0.665, 0.637, 0.743, 0.674, 0.741, 0.708, etc. By causing the optical system to satisfy the above relationship, the ratio of the thickness of the first lens on the optical axis and the edge thickness of the first lens is reasonably configured, which is conducive to simplifying the production and manufacturing of the first lens.

[0065] In an embodiment, the optical system satisfies a relationship: 0.12≤(CT4+CT5) / TTL≤0.24; wherein CT4 is a thickness of the fourth lens on the optical axis, and CT5 is a thickness of the fifth lens on the optical axis. Specifically, the value of (CT4+CT5) / TTL can be 0.132, 0.206, 0.217, 0.198, 0.193, 0.227, 0.167, 0.179, etc. By causing the optical system to satisfy the above relationship, the ability of the fourth lens and the fifth lens to regulate light is enhanced, which is conducive to regulating more light to enter the rear system and improving the relative illumination.

[0066] In an embodiment, the optical system satisfies a relationship: -1.5≤(VD4-VD5) / F45≤-0.3; wherein VD4 is an Abbe number of the fourth lens, VD5 is an Abbe number of the fifth lens, and F45 is a combined effective focal length of the fourth lens and the fifth lens. Specifically, the value of (VD4-VD5) / F45 can be -1.495, -1.258, -0.348, -1.367, -1.246, -1.156, -1.458, -0.643, etc. By causing the optical system to satisfy the above relationship, the ratio of the Abbe number difference between the fourth lens and the fifth lens and the combined effective focal length of the fourth lens and the fifth lens is reasonably configured, which is conducive to correcting the chromatic aberration of the optical system, restoring the authenticity of the color, and improving the imaging quality.

[0067] In an embodiment, the optical system satisfies a relationship: 0.3≤CT5 / CT4≤1.1; wherein CT5 is a thickness of the fifth lens on the optical axis, and CT4 is a thickness of the fourth lens on the optical axis. Specifically, the value of CT5 / CT4 can be 0.397, 0.951, 0.524, 1.076, 0.864, 0.754, 0.498, 0.913, etc. By causing the optical system to satisfy the above relationship, the ratio of the thickness of the fifth lens on the optical axis and the thickness of the fourth lens on the optical axis is reasonably configured, the fifth lens and the fourth lens can regulate each other, and the feature of miniaturization of the optical system is maintained.

[0068] In an embodiment, the fourth lens and the fifth lens are cemented lenses, which are beneficial to correct chromatic aberration and balance various aberrations, improve the resolving power of the optical system, effectively reduce the tolerance sensitivity, and improve the imaging quality of the optical system.

[0069] In an embodiment, the optical system satisfies a relationship: 0.4≤R11 / (R12+CT6)≤0.75; wherein R11 is the radius of curvature of the object side of the sixth lens at the optical axis, R12 is the radius of curvature of the image side of the sixth lens at the optical axis, and CT6 is the thickness of the sixth lens on the optical axis. Specifically, the value of R11 / (R12+CT6) can be 0.469, 0.482, 0.638, 0.743, 0.695, 0.454, 0.683, 0.512, etc. By making the optical system satisfy the above relationship, the ratio of the radius of curvature of the object side of the sixth lens at the optical axis and the radius of curvature of the image side of the sixth lens at the optical axis is reasonably configured, which is beneficial to making the shape of the sixth lens close to a concentric circle and beneficial to the smooth transition of the light ray to the seventh lens, reducing the loss of light energy.

[0070] In an embodiment, the optical system satisfies a relationship: -3.5≤CT1 / SAG1≤-1.5; wherein CT1 is the thickness of the first lens on the optical axis, and SAG1 is the sagittal height of the object side of the first lens at the maximum effective aperture, that is, the distance between the intersection of the object side of the first lens and the optical axis and the maximum effective aperture of the object side of the first lens in the direction parallel to the optical axis. Specifically, the value of CT1 / SAG1 can be -1.695, -3.484, -1.963, -2.841, -3.075, -3.129, -1.854, -2.413, etc. By making the optical system satisfy the above relationship, the refractive power and thickness of the first lens at various positions perpendicular to the optical axis are reasonably controlled, the first lens is prevented from being too thick or too thin, and the tolerance sensitivity of the optical system is reduced.

[0071] In an embodiment, the optical system satisfies a relationship: 1.2≤SD1 / IMGH≤1.3; wherein SD1 is half of the maximum effective aperture of the object side of the first lens. Specifically, the value of SD1 / IMGH can be 1.256, 1.284, 1.236, 1.274, 1.209, 1.268, 1.293, 1.216, etc. By making the optical system satisfy the above relationship, the ratio of half of the maximum effective aperture of the object side of the first lens and half of the image height corresponding to the maximum field angle of the optical system is reasonably configured, which is beneficial to reasonably controlling the size of the object side of the first lens and realizing the miniaturization of the optical system.

[0072] In one embodiment, the optical system satisfies the relationship: 28≤180*TTL / IMGH / FOV≤39; wherein FOV is the maximum field of view angle of the optical system, TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, and IMGH is half of the image height corresponding to the maximum field of view angle of the optical system. Specifically, the value of 180*TTL / IMGH / FOV can be 28.654, 32.412, 33.385, 35.674, 36.841, 38.246, 31.029, 34.966, etc. By making the optical system satisfy the above relationship, a balance between large image height, long focal length and miniaturization is achieved, so that the optical system can meet the market demand for large target surface and miniaturization at the same time.

[0073] In one embodiment, the optical system satisfies the relationship: 0.95≤IMGH / (F*Tan(FOV / 2))≤1.1; wherein FOV is the maximum field of view angle of the optical system, 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. Specifically, the value of IMGH / (F*Tan(FOV / 2)) can be 0.995, 0.964, 1.023, 0.986, 0.974, 0.963, 1.084, 0.956, etc. By making the optical system satisfy the above relationship, the optical distortion of the optical system can be controlled within a small range, which is beneficial to improve the imaging quality of the optical system.

[0074] In one embodiment, the optical system satisfies the relationship: 0.3≤IMGH / F≤0.45; wherein 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. Specifically, the value of IMGH / F can be 0.316, 0.413, 0.423, 0.359, 0.374, 0.394, 0.382, 0.441, etc. By making the optical system satisfy the above relationship, the ratio of half of the image height corresponding to the maximum field of view angle of the optical system to the effective focal length of the optical system is reasonably configured, which is beneficial to the optical system to achieve a larger imaging surface and improve the imaging quality of the optical system.

[0075] In one embodiment, the optical system satisfies the relationship: 1.55≤FNO≤1.65. Specifically, the value of 1.55≤FNO≤1.65 can be 1.585, 1.598, 1.583, 1.576, 1.569, 1.629, 1.635, 1.602, etc. By making the optical system satisfy the above relationship, the aperture number of the optical system is set within a reasonable range, so that the optical system has a combination effect of a large field of view angle and a large aperture, and has a reasonable amount of light, which improves the overall illumination of the imaging picture and makes the optical system suitable for different lighting environments.

[0076] In an embodiment, the optical system satisfies a relationship: 1.4≤F3 / F≤1.9; wherein F3 is the effective focal length of the third lens. Specifically, the value of F3 / F can be 1.498, 1.622, 1.854, 1.746, 1.685, 1.536, 1.884, 1.669, etc. By making the optical system satisfy the above relationship, the third lens is facilitated to have appropriate refractive power in the optical system, the surface shape design of the third lens is more simple and flexible, aberration is reduced, and the balance between aberration correction and imaging quality of the overall optical system is simplified.

[0077] In an embodiment, the optical system satisfies a relationship: 0.8≤F4 / F≤1.2; wherein F4 is the effective focal length of the fourth lens. Specifically, the value of F4 / F can be 0.965, 0.863, 1.059, 1.124, 1.064, 1.175, 0.941, 0.958, etc. By making the optical system satisfy the above relationship, the fourth lens is facilitated to have appropriate refractive power in the optical system, the surface shape design of the fourth lens is more simple and flexible, aberration is reduced, and the balance between aberration correction and imaging quality of the overall optical system is simplified.

[0078] In an embodiment, the optical system satisfies a relationship: -0.7≤F5 / F≤-0.4. Specifically, the value of F5 / F can be -0.652, -0.523, -0.464, -0.548, -0.341, -0.643, -0.587, -0.416, etc. By making the optical system satisfy the above relationship, the fifth lens is facilitated to have appropriate refractive power in the optical system, the surface shape design of the fifth lens is more simple and flexible, aberration is reduced, and the balance between aberration correction and imaging quality of the overall optical system is simplified.

[0079] In an embodiment, the optical system satisfies a relationship: 1.8≤F6 / F≤8; wherein F6 is the effective focal length of the sixth lens. Specifically, the value of F6 / F can be 1.882, 3.458, 6.612, 5.854, 4.674, 7.941, 6.201, 3.841, etc. By making the optical system satisfy the above relationship, the sixth lens is facilitated to have appropriate refractive power in the optical system, the surface shape design of the sixth lens is more simple and flexible, aberration is reduced, and the balance between aberration correction and imaging quality of the overall optical system is simplified.

[0080] In an embodiment, the optical system satisfies a relationship: 1.8≤|F7 / F|≤6; wherein F7 is an effective focal length of the seventh lens. Specifically, |F7 / F| can be 5.931, 3.185, 4.201, 2.068, 3.521, 4.328, 1.963, 4.871, etc. By making the optical system satisfy the above relationship, the seventh lens is properly matched in the optical system, the surface design of the seventh 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.

[0081] In an embodiment, the optical system satisfies a relationship: -0.5≤R3 / R4≤-0.1; wherein R3 is a curvature radius of an object side surface of the second lens at the optical axis, and R4 is a curvature radius of an image side surface of the second lens at the optical axis. Specifically, R3 / R4 can be -0.328, -0.374, -0.492, -0.265, -0.298, -0.124, -0.193, -0.385, etc. By making the optical system satisfy the above relationship, the ratio of the curvature radius of the object side surface of the second lens at the optical axis and the curvature radius of the image side surface of the second lens at the optical axis is properly 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.

[0082] In an embodiment, the optical system satisfies a relationship: -7.5≤R5 / R6≤-0.9. Specifically, R5 / R6 can be -0.745, -0.651, -0.623, -0.419, -0.363, -0.182, -0.576, -0.936, etc. By making the optical system satisfy the above relationship, the ratio of the curvature radius of the object side surface of the third lens at the optical axis and the curvature radius of the image side surface of the third lens at the optical axis is properly 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.

[0083] In an embodiment, the optical system satisfies the relationship: -1.6≤R7 / R8≤-0.3; 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 -1.565, -1.048, -1.354, -1.514, -0.853, -0.745, -0.401, -0.695, etc. By making the optical system 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.

[0084] In an embodiment, the optical system satisfies the relationship: -5.5≤R9 / R10≤-1.5; where R9 is the radius of curvature of the object side surface of the fifth lens at the optical axis, and R10 is the radius of curvature of the image side surface of the fifth lens at the optical axis. Specifically, the value of R9 / R10 can be -4.652, -3.541, -3.698, -3.984, -5.435, -2.384, -2.693, -1.532, etc. By making the optical system satisfy the above relationship, the ratio of the radius of curvature of the object side surface of the fifth lens at the optical axis and the radius of curvature 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.

[0085] In an embodiment, the optical system satisfies the relationship: 0.6≤R11 / R12≤1.2. Specifically, the value of R11 / R12 can be 0.966, 0.852, 0.631, 1.028, 1.124, 0.644, 0.693, 0.902, 0.816, etc. By making the optical system 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: 4≤R13 / R14≤120. Specifically, R13 / R14 can have a value of 4.952, 92.325, 75.961, 81.239, 100.845, 119.542, 23.452, 34.185, 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 processing difficulty of the seventh lens is reduced.

[0087] In an embodiment, the optical system satisfies a relationship: 1.1≤CT2 / ET2≤1.3; wherein ET2 is the edge thickness of the second lens, i.e., the distance between the maximum effective aperture of the object side surface and the maximum effective aperture of the image side surface of the second lens in the direction parallel to the optical axis. Specifically, CT2 / ET2 can have a value of 1.163, 1.201, 1.197, 1.173, 1.236, 1.182, 1.215, 1.283, etc. By causing the optical system to satisfy the above relationship, the ratio of the thickness of the second lens on the optical axis and the edge thickness of the second lens is reasonably configured, which is beneficial to simplify the production and manufacturing of the second lens.

[0088] In an embodiment, the optical system satisfies a relationship: 0.3≤CT5 / ET5≤0.71; wherein ET5 is the edge thickness of the fifth lens, i.e., the distance between the maximum effective aperture of the object side surface and the maximum effective aperture of the image side surface of the fifth lens in the direction parallel to the optical axis. Specifically, CT5 / ET5 can have a value of 0.323, 0.685, 0.641, 0.698, 0.594, 0.423, 0.456, 0.364, etc. By causing the optical system to satisfy the above relationship, the ratio of the thickness of the fifth lens on the optical axis and the edge thickness of the fifth lens is reasonably configured, which is beneficial to simplify the production and manufacturing of the fifth lens.

[0089] 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, and has the effect of filtering out background stray light, which 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 the infrared light, thereby realizing different waveband selection, which can realize visible light imaging and infrared imaging, thereby 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 film, colored glass or other materials, which can be selected according to actual needs, and is not limited in the present embodiment.

[0090] 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 preparing the lens 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, assembly difficulty, etc., 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.

[0091] In some embodiments, at least one lens in the optical system is made of 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, at least one lens in the optical system can also be made of plastic (PC). The plastic material can be polycarbonate, gum, etc. The lens made of plastic can reduce the production cost of the optical system, and the lens made of glass can withstand high or low temperatures and has excellent optical effect and better stability. In some embodiments, lenses made of different materials can be arranged in the optical system, i.e., 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 exhaustively listed here.

[0092] First embodiment

[0093] 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:

[0094] The first lens L1 has a 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 convex near the optical axis.

[0095] The second lens L2 has a 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.

[0096] The third lens L3 has a 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.

[0097] The fourth lens L4 has a 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.

[0098] The fifth lens L5 has a 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.

[0099] The sixth lens L6 has a 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.

[0100] The seventh lens L7 has a 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 concave near the optical axis.

[0101] 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, 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 380nm-780nm. 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 seventh 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.

[0102] (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 seventh 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.

[0103] Table 1a shows the parameters of the optical system 10 of this embodiment, wherein the Y radius is the curvature radius 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. 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 555nm. The units of the Y radius, the thickness and the effective focal length are millimeters (mm).

[0104] Table 1a

[0105]

[0106]

[0107] wherein F is the effective focal length of the optical system 10, FNO is the aperture number of the optical system 10, FOV is the maximum field of view angle of the optical system 10, and TTL is the distance from the object side S1 of the first lens to the imaging surface IMG at the optical axis, i.e. the total optical length.

[0108] 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:

[0109]

[0110] wherein x is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the vertex of the aspherical surface, k is the conic coefficient, and Ai is the high-order term coefficient corresponding to the i-th high-order term in the aspherical surface formula.

[0111] Table 1b gives the high-order term coefficients A4, A6, A8, A10, A12, A14 and A16 of the aspherical surfaces S3 and S4, and the aspherical surfaces S13 and S14 which can be used in the first embodiment;

[0112] Table 1b

[0113]

[0114] 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 (in mm) from the imaging plane to the intersection point of the light ray and the optical axis, 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. It can be seen from Fig. 1 (a) that the convergence focal shift of the light rays at different wavelengths in the first embodiment tends to be consistent, and the diffraction spot or color fringe in the imaging picture is effectively suppressed, which indicates that the imaging quality of the optical system 10 in the embodiment is good. 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 (in mm) from the imaging plane to the intersection point of the light ray and the optical axis, 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. It can be seen from Fig. 1 (a) that the convergence focal shift of the light rays at different wavelengths in the first embodiment tends to be consistent, and the diffraction spot or color fringe in the imaging picture is effectively suppressed, which indicates that the imaging quality of the optical system 10 in the embodiment is good.

[0115] 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, which is 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. It can be seen from Fig. 1 (b) that 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. 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, which is 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. It can be seen from Fig. 1 (b) that 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.

[0116] 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, which is in deg. The distortion curve represents the distortion size value corresponding to different field of view angles.Figure 2 As can be seen from the middle (c), the image distortion caused by the main light beam is small at the wavelength of 546.0000 nm, and the imaging quality of the system is excellent.

[0117] As can be seen from the middle (c), the image distortion caused by the main light beam is small at the wavelength of 546.0000 nm, and the imaging quality of the system is excellent. Figure 2 As can be seen from the middle (a), Figure 2 As can be seen from the middle (b), and Figure 3 As can be seen from the middle (c), the aberration of the optical system 10 of the present embodiment is small, the imaging quality is good, and the imaging quality is good.

[0118] Second embodiment

[0119] As can be seen from the middle (c), the image distortion caused by the main light beam is small at the wavelength of 546.0000 nm, and the imaging quality of the system is excellent. 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:

[0120] 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 is convex at the vicinity of the optical axis.

[0121] 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 is convex at the vicinity of the optical axis.

[0122] 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 is convex at the vicinity of the optical axis.

[0123] 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 is convex at the vicinity of the optical axis.

[0124] 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 is concave at the vicinity of the optical axis.

[0125] 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 is concave at the vicinity of the optical axis.

[0126] The seventh lens L7 has a negative refractive power, the object side surface S13 of the seventh lens L7 is convex at the vicinity of the optical axis, and the image side surface S14 is concave at the vicinity of the optical axis.

[0127] The other structures of the second embodiment are the same as those of the first embodiment, and reference can be made.

[0128] Table 2a shows the parameters of the optical system 10 of the present embodiment, wherein 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 unit of the Y radius, the thickness and the effective focal length is millimeter (mm), and the meanings of the other parameters are the same as those of the first embodiment.

[0129] Table 2a

[0130]

[0131]

[0132] Table 2b gives the high order term coefficients of each aspherical surface in the second embodiment, wherein each aspherical surface can be defined by the formula given in the first embodiment;

[0133] Table 2b

[0134]

[0135] Figure 4 Fig. 2a, Figure 4 Fig. 2b, Figure 4 Figs. 2c respectively show the longitudinal spherical aberration curve, the astigmatism curve and the distortion curve of the optical system 10 of the second embodiment, wherein the longitudinal spherical aberration curve represents the deviation of the converging focal points 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 values corresponding to different field angles. It can be seen from the aberration diagrams in Figs. 2a-2c 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 5

[0136] Third Embodiment

[0137] Please refer to Figure 6 The optical system 10 of this embodiment comprises, in order from the object side to the image side along the optical axis direction:

[0138] 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 convex at the vicinity of the optical axis.

[0139] 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.

[0140] 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.

[0141] 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.

[0142] 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. ​

[0143] 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.

[0144] 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.

[0145] The other structures of the third embodiment are the same as those of the first embodiment, and reference can be made.

[0146] Table 3a shows the parameters of the optical system 10 of the embodiment, wherein the focal length, the material refractive index and the Abbe number are obtained by using the visible light with the reference wavelength of 555 nm, the unit of the Y radius, the thickness and the effective focal length is millimeter (mm), and the meanings of the other parameters are the same as those of the first embodiment;

[0147] Table 3a

[0148]

[0149] Table 3b shows the high order term coefficients of the aspherical surface that can be used in the third embodiment, wherein the aspherical surface can be defined by the formula given in the first embodiment;

[0150] Table 3b

[0151]

[0152] Figure 6 Fig. 3a, Figure 6 Fig. 3b, Figure 6 Fig. 3c respectively shows the longitudinal spherical aberration curve, the astigmatism curve and the distortion curve of the optical system 10 of the third embodiment, wherein the longitudinal spherical aberration curve represents the convergence focus point deviation of the light rays with 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 value corresponding to the different field angles. It can be seen from the aberration diagrams in Figs. 3a-3c 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. Figure 7

[0153] The fourth embodiment

[0154] Please refer to Figure 8 The optical system 10 of the embodiment comprises, in sequence from the object side to the image side along the optical axis direction:

[0155] 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 convex at the vicinity of the optical axis.

[0156] ​The second lens L2 has positive refractive power, the object side S3 of the second lens L2 is convex at the vicinity of the optical axis, and the image side S4 of the second lens L2 is convex at the vicinity of the optical axis.

[0157] The third lens L3 has positive refractive power, the object side S5 of the third lens L3 is convex at the vicinity of the optical axis, and the image side S6 of the third lens L3 is convex at the vicinity of the optical axis.

[0158] The fourth lens L4 has positive refractive power, the object side S7 of the fourth lens L4 is convex at the vicinity of the optical axis, and the image side S8 of the fourth lens L4 is convex at the vicinity of the optical axis.

[0159] The fifth lens L5 has negative refractive power, the object side S9 of the fifth lens L5 is concave at the vicinity of the optical axis, and the image side S10 of the fifth lens L5 is concave at the vicinity of the optical axis.

[0160] The sixth lens L6 has positive refractive power, the object side S11 of the sixth lens L6 is convex at the vicinity of the optical axis, and the image side S12 of the sixth lens L6 is concave at the vicinity of the optical axis.

[0161] The seventh lens L7 has positive refractive power, the object side S13 of the seventh lens L7 is concave at the vicinity of the optical axis, and the image side S14 of the seventh lens L7 is convex at the vicinity of the optical axis.

[0162] The other structures of the fourth embodiment are the same as those of the first embodiment, and reference can be made.

[0163] Table 4a shows the parameters of the optical system 10 of the present embodiment, wherein the focal length, the material refractive index and the Abbe number are obtained by using the visible light with the reference wavelength of 555 nm, the unit of the Y radius, the thickness and the effective focal length is millimeter (mm), and the meanings of the other parameters are the same as those of the first embodiment;

[0164] Table 4a

[0165]

[0166]

[0167] Table 4b shows the high-order term coefficients of the aspherical surfaces which can be used in the fourth embodiment, wherein the aspherical surface type can be defined by the formula given in the first embodiment;

[0168] Table 4b

[0169]

[0170] Figure 8 in (a), Figure 8 in (b), Figure 8Image (c) shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system 10 of the fourth 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 9 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.

[0171] Fifth embodiment

[0172] Please refer to Figure 10 The optical system 10 of this embodiment includes, from the object side to the image side along the optical axis:

[0173] 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 convex near the optical axis.

[0174] 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.

[0175] 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.

[0176] 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.

[0177] 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.

[0178] 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.

[0179] The seventh lens L7 has positive 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.

[0180] Table 5a shows the parameters of the optical system 10 in this embodiment. The focal length, material refractive index and Abbe number are obtained using visible light with a reference wavelength of 555nm. The units of Y radius, thickness and effective focal length are millimeters (mm). The meanings of the other parameters are the same as those of the parameters in the first embodiment.

[0181] Table 5a

[0182]

[0183] Table 5b gives the high order term coefficients of each aspherical mirror surface in the fifth embodiment, wherein each aspherical surface type can be defined by the formula given in the first embodiment;

[0184] Table 5b

[0185]

[0186] Figure 10 Fig. 5b shows the longitudinal spherical aberration curve, the astigmatism curve and the distortion curve of the optical system 10 in the fifth embodiment, 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 sagittal field curvature; the distortion curve represents the distortion value corresponding to different field angles. It can be seen from the aberration curves in Fig. 5b that the longitudinal spherical aberration, field curvature and distortion of the optical system 10 are well controlled, so that the optical system 10 in this embodiment has good imaging quality. Figure 10 Figure 10 Fig. 5b shows the longitudinal spherical aberration curve, the astigmatism curve and the distortion curve of the optical system 10 in the fifth embodiment, 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 sagittal field curvature; the distortion curve represents the distortion value corresponding to different field angles. It can be seen from the aberration curves in Fig. 5b that the longitudinal spherical aberration, field curvature and distortion of the optical system 10 are well controlled, so that the optical system 10 in this embodiment has good imaging quality. Figure 11

[0187] Table 6 shows the values of FOV, TTL / IMGH, TTL / F, SD1 / IMGH / Tan(FOV / 2), FOV / FNO, CT2 / CT1, F1 / F, F2 / F, R2 / R1, |(R5-R6) / (R5+R6)|, (R13-R14) / (R13+R14), F2 / CT2, F5 / CT5, CT1 / ET1, (CT4+CT5) / TTL, (VD4-VD5) / F45, R11 / (R12+CT6), CT1 / SAG1, SD1 / IMGH, 180*TTL / IMGH / FOV, I MGH / (F*Tan(FOV / 2)), I MGH / F, FNO, F3 / F, F4 / F, F5 / F, F6 / F, |F7 / F|, R3 / R4, R5 / R6, R7 / R8, R9 / R10, R11 / R12, R13 / R14, CT2 / ET2 and CT5 / ET5 in the optical systems 10 of the first to fifth embodiments;

[0188] Table 6

[0189]

[0190]

[0191] ​​From Table 6, it can be seen that the optical systems of the first to fifth embodiments all satisfy the following relationships: 30 deg < FOV < 50 deg, 7.1 < TTL / IMGH < 7.5, 2.2 < TTL / F < 3.1, 2.9 < SD1 / IMGH / Tan(FOV / 2) < 4.2, 20 < FOV / FNO < 30, 1.4 < CT2 / CT1 < 3.1, -2.2 < F1 / F < -1.4, 1.4 < F2 / F < 1.92, 4.5 < R2 / R1 < 10, 1 < |(R5-R6) / (R5+R6)| < 45, 0.4 < (R13-R14) / (R13+R14) < 1.4, 3 < F2 / CT2 < 3.9, -5 < F5 / CT5 < -2, 0.6 < CT1 / ET1 < 0.8, 0.12 < (CT4+CT5) / TTL < 0.24, -1.5 < (VD4-VD5) / F45 < -0.3, 0.4 < R11 / (R12+CT6) < 0.75, -3.5 < CT1 / SAG1 < -1.5, 1.2 < SD1 / IMGH < 1.3, 28 < 180*TTL / IMGH / FOV < 39, 0.95 < IMGH / (F*Tan(FOV / 2)) < 1.1, 0.3 < IMGH / F < 0.45, 1.55 < FNO < 1.65, 1.4 < F3 / F < 1.9, 0.8 < F4 / F < 1.2, -0.7 < F5 / F < -0.4, 1.8 < F6 / F < 8, 1.8 < |F7 / F| < 6, -0.5 < R3 / R4 < -0.1, -7.5 < R5 / R6 < -0.9, -1.6 < R7 / R8 < -0.3, -5.5 < R9 / R10 < -1.5, 0.6 < R11 / R12 < 1.2, 4 < R13 / R14 < 120, 1.1 < CT2 / ET2 < 1.3, and 0.3 < CT5 / ET5 < 0.71.

[0192] See 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 imaging clarity, the field of view and the miniaturization of the camera module 20 can be improved by reasonably designing the surface shape and the refractive power of each lens in the optical system 10.

[0193] Please refer to ​ The application further provides an electronic device 30, which comprises a housing 31 and the camera module 20 described above, and the camera module 20 is arranged in the housing 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 imaging clarity, the field of view and the miniaturization of the electronic device 30 can be improved.

[0194] 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 in that, There are seven refractive lenses in total, arranged sequentially from the object side to the image side along the optical axis: The first lens has negative refractive power. The object side of the first lens is concave near the optical axis, and the image side of the first lens is convex near the optical axis. The second lens has positive refractive power. The object side of the second lens is convex near the optical axis, and the image side of the second lens is convex near the optical axis. The third lens has positive refractive power. The object side of the third lens is convex near the optical axis, and the image side of the third lens is convex near the optical axis. The fourth lens has positive refractive power. The object-side surface of the fourth lens is convex near the optical axis, and the image-side surface of the fourth lens is convex near the optical axis. The fifth lens has negative refractive power. The object-side surface of the fifth lens is concave near the optical axis, and the image-side surface of the fifth lens is concave near the optical axis. The sixth lens has positive refractive power. The object-side surface of the sixth lens is convex near the optical axis, and the image-side surface of the sixth lens is concave near the optical axis. The seventh lens has either positive or negative refractive power; The optical system satisfies the following relationships: 30deg≤FOV≤50deg, 7.1≤TTL / IMGH≤7.5; 2.9≤SD1 / IMGH / Tan(FOV / 2)≤4.2; Wherein, FOV is the maximum field of view of the optical system, TTL is the distance on the optical axis from the object side of the first lens to the imaging surface, IMGH is half the image height corresponding to the maximum field of view of the optical system, and SD1 is half the maximum effective aperture of the object side of the first lens.

2. The optical system as described in claim 1, characterized in that, The optical system satisfies the following relationship: 2.2≤TTL / F≤3.1; and / or, 20deg≤FOV / FNO≤30deg; Wherein, FNO is the aperture number of the optical system, and F is the effective focal length of the optical system.

3. The optical system as described in claim 1, characterized in that, The optical system satisfies the following relationship: 1.4 ≤ CT2 / CT1 ≤ 3.1; and / or, -2.2≤F1 / F≤-1.4; and / or, 1.4 ≤ F² / F ≤ 1.92; Wherein, CT1 is the thickness of the first lens on the optical axis, CT2 is the thickness of the second lens on the optical axis, F is the effective focal length of the optical system, F1 is the effective focal length of the first lens, and F2 is the effective focal length of the second lens.

4. The optical system as claimed in claim 1, characterized in that, The optical system satisfies the following relationship: 4.5 ≤ R2 / R1 ≤ 10; and / or, 1≤|(R5-R6) / (R5+R6)|≤45; and / or, 0.4≤(R13-R14) / (R13+R14)≤1.4; Wherein, R1 is the radius of curvature of the object side of the first lens at the optical axis, R2 is the radius of curvature of the image side of the first lens at the optical axis, 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, R13 is the radius of curvature of the object side of the seventh lens at the optical axis, and R14 is the radius of curvature of the image side of the seventh lens at the optical axis.

5. The optical system as claimed in claim 1, characterized in that, The optical system satisfies the following relationship: 3≤F2 / CT2≤3.9; and / or, -5≤F5 / CT5≤-2; and / or, 0.6≤CT1 / ET1≤0.8; Wherein, F2 is the effective focal length of the second lens, F5 is the effective focal length of the fifth lens, CT2 is the thickness of the second lens on the optical axis, CT5 is the thickness of the fifth lens on the optical axis, CT1 is the thickness of the first lens on the optical axis, and ET1 is the edge thickness of the first lens.

6. The optical system as claimed in claim 1, characterized in that, The optical system satisfies the following relationship: 0.12≤(CT4+CT5) / TTL≤0.24; and / or, -1.5 ≤(VD4-VD5) / F45≤-0.3 ; and / or, 0.3≤CT5 / CT4≤1.1; Wherein, CT4 is the thickness of the fourth lens on the optical axis, CT5 is the thickness of the fifth lens on the optical axis, VD4 is the Abbe number of the fourth lens, VD5 is the Abbe number of the fifth lens, and F45 is the combined effective focal length of the fourth and fifth lenses.

7. The optical system as claimed in claim 1, characterized in that, The optical system satisfies the following relationship: 0.4≤R11 / (R12+CT6)≤0.75; and / or, -3.5≤CT1 / SAG1≤-1.5; and / or, 1.2≤SD1 / IMGH≤1.3; Wherein, R11 is the radius of curvature of the object side of the sixth lens at the optical axis, R12 is the radius of curvature of the image side of the sixth lens at the optical axis, CT6 is the thickness of the sixth lens on the optical axis, CT1 is the thickness of the first lens on the optical axis, SAG1 is the sag at the maximum effective aperture of the object side of the first lens, and SD1 is half of the maximum effective aperture of the object side of the first lens.

8. The optical system as claimed in claim 1, characterized in that, The optical system satisfies the following relationship: 28≤180deg*TTL / IMGH / FOV≤39; and / or, 0.95≤IMGH / (F×Tan(FOV / 2))≤1.1; and / or, 0.3≤IMGH / F≤0.45; Where F is the effective focal length of the optical system.

9. A camera module, characterized in that, It includes a photosensitive chip and an optical system according to any one of claims 1 to 8, wherein the photosensitive chip is located on the image side of the optical system.

10. An electronic device, characterized in that, The electronic device includes a housing and the camera module as described in claim 9, wherein the camera module is disposed within the housing.

Images