Optical system, camera module and electronic equipment

Abstract

An optical system, a camera module and an electronic device, the optical system sequentially comprising from an object side to an image side along an optical axis: first to seventh lenses having refractive power, 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, the fifth lens having negative refractive power, the sixth lens having positive refractive power, and the sixth lens having negative refractive power; the seventh lens has positive refractive power or negative refractive power, and 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 concave in a paraxial region. 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 convex surfaces near the optical axis. Through reasonable design of the surface type and the refractive power of each lens of the optical system, the optical system has the characteristics of high imaging definition, large field angle and miniaturization.

Description

Technical Field

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

[0002] With the rapid development of the automotive industry and the continuous evolution of autonomous driving technology, the performance of in-vehicle lenses directly affects the reliability and accuracy of driver assistance systems and autonomous driving systems. Among many application scenarios of in-vehicle lenses, the front-view lens undertakes key tasks such as target detection, obstacle recognition, and lane line tracking, which are crucial for ensuring driving safety.

[0003] On the one hand, it is required that the field of view angle of the in-vehicle lens can take into account the precise detection of distant targets and the capture of key information nearby, and the in-vehicle lens is required to have a large field of view angle. On the other hand, with the improvement of the autonomous driving level, the requirement for the image plane size of the photosensitive chip is getting larger and larger to obtain more image details. In addition, due to the limited installation space of the in-vehicle system, the in-vehicle lens needs to meet the requirement of miniaturization in design. Summary of the Invention

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

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

[0006] In the first aspect, the present invention provides an optical system, which has a total of seven lenses with refractive power, and successively includes 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 near the optical axis, and the image side surface of the first lens is convex near the optical axis; a second lens with negative refractive power, the object side surface of the second lens is convex near the optical axis, and the image side surface of the second lens is convex near the optical axis; a third lens with positive refractive power, the object side surface of the third lens is convex near the optical axis, and the image side surface of the third lens is convex near the optical axis; a fourth lens with 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; a fifth lens with positive 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; a sixth lens with 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; a seventh lens with positive or negative refractive power, the object side surface of the seventh lens can be convex, concave, or flat near the optical axis, and the image side surface of the seventh lens can be convex, concave, or flat near the optical axis.

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

[0008] By making the first lens have a negative refractive power, with the object side of the first lens being concave near the optical axis and the image side of the first lens being convex near the optical axis, it is beneficial to diverge light. The light emerging from the image side of the first lens can enable the subsequent optical system to have a larger light-receiving surface and reduce the front aperture; by making the second lens have a positive refractive power, with the object side of the second lens being convex near the optical axis and the image side of the second lens being convex near the optical axis, it is beneficial to converge light. When paired with the first lens having a negative focal power, it can reduce the total length of the fixed-focus lens, and the light-converging effect can further reduce the rear aperture; by making the third lens have a positive refractive power, with the object side of the third lens being convex near the optical axis and the image side of the third lens being convex near the optical axis, it is beneficial to receive the light converged from the second lens, reduce the height of the light beam when it enters the object side of the fourth lens, and reduce the aperture of the object side of the fourth lens. At the same time, it is beneficial to correct the diaphragm aberration; by making the fourth lens have a positive refractive power, with the object side of the fourth lens being convex near the optical axis and the image side of the fourth lens being convex near the optical axis, it is beneficial to reduce the angle between the incident light at the edge field of view and the surface normal of the object side, avoiding light divergence; by making the fifth lens have a negative refractive power, with the object side of the fifth lens being concave near the optical axis and the image side of the fifth lens being concave near the optical axis, it is beneficial to diverge the incident light, enabling the light to smoothly transition to the optical system on the image side of the fifth lens; by making the sixth lens have a positive refractive power, with the object side of the sixth lens being convex near the optical axis and the image side of the sixth lens being concave near the optical axis, it is beneficial for the light to smoothly enter the seventh lens and reduce the sensitivity of the fixed-focus lens.

[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, which can avoid introducing excessive aberrations and is beneficial for the optical system to meet the characteristics of miniaturization while obtaining 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 to the image height of the optical system is reasonably configured. In combination with the above range of the maximum field of view angle of the optical system, it is beneficial to limit the total length of the optical system and achieve the miniaturization of the optical system.

[0011] In one embodiment, the optical system satisfies the relation: 2.2 ≤ TTL / F ≤ 3.1; where F is the effective focal length of the optical system. By making the optical system satisfy the above relation, it is beneficial to rationally configure the ratio of the distance from the object side surface of the first lens to the imaging surface of the optical system on the optical axis to the effective focal length of the optical system, so that the optical system has a smaller overall optical length and realizes the characteristic of miniaturization.

[0012] In one embodiment, the optical system satisfies the relation: 2.9 ≤ SD1 / IMGH / Tan(FOV / 2) ≤ 4.2; where SD1 is half of the maximum effective aperture of the object side surface of the first lens. By making the optical system satisfy the above relation, it is beneficial to ensure the balance among the front aperture size, the field of view angle, and the image plane of the optical system, and is beneficial to improving the resolution.

[0013] In one embodiment, the optical system satisfies the relation: 20deg ≤ FOV / FNO ≤ 30deg; where FNO is the f-number of the optical system. By making the optical system satisfy the above relation, the ratio of the field of view angle to the f-number of the optical system is rationally configured, realizing the combined effect of a larger field of view angle and a large aperture of the optical system. The optical system has a reasonable light input amount, improves the overall illuminance of the imaging picture, and makes the optical system applicable to different lighting environments.

[0014] In one embodiment, the optical system satisfies the relation: 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. By making the optical system satisfy the above relation, the ratio of the thickness of the first lens on the optical axis to the thickness of the second lens on the optical axis is rationally configured, and the first lens and the second lens can be mutually adjusted to maintain the characteristic of miniaturization of the optical system.

[0015] In one embodiment, the optical system satisfies the relation: -2.2 ≤ F1 / F ≤ -1.4; where F is the effective focal length of the optical system and F1 is the effective focal length of the first lens. By making the optical system satisfy the above relation, it is beneficial for the refractive power of the first lens in the optical system to be properly matched, and the surface type design of the first lens is more simple and flexible. At the same time, it is also beneficial to diverge light, and the light rays emerging from the image side surface of the first lens can enable the subsequent optical system to have a larger light receiving surface, simplifying the overall aberration correction and imaging quality balance of the optical system.

[0016] In one embodiment, the optical system satisfies the relation: 1.4 ≤ F2 / F ≤ 1.92; where F2 is the effective focal length of the second lens. By making the optical system satisfy the above relation, it is beneficial for the refractive power of the second lens in the optical system to be properly matched, the surface shape design of the second lens to be more simple and flexible, to reduce aberration, and to simplify the aberration correction of the overall optical system and the balance of imaging quality.

[0017] In one embodiment, the optical system satisfies the relation: 4.5 ≤ R2 / R1 ≤ 10; where R1 is the curvature radius of the object side surface of the first lens on the optical axis, and R2 is the curvature radius of the image side surface of the first lens on the optical axis. By making the optical system satisfy the above relation, it is beneficial for the ratio of the curvature radius of the image side surface of the first lens on the optical axis to the curvature radius of the object side surface of the first lens on the optical axis to be reasonably configured, to control the shape of the first lens, to comprehensively balance the spherical aberration, chromatic aberration and field curvature of the optical system, and to reduce the risk of ghost imaging, to improve the resolution ability of the optical system. At the same time, it is also beneficial to reduce the processing difficulty of the first lens.

[0018] In one embodiment, the optical system satisfies the relation: 1 ≤ |(R5 - R6) / (R5 + R6)| ≤ 45; where R5 is the curvature radius of the object side surface of the third lens on the optical axis, and R6 is the curvature radius of the image side surface of the third lens on the optical axis. By making the optical system satisfy the above relation, it is beneficial to collect and compress the incident light in front, to make the light smoothly transition to the optical system at the back, to reduce the aberration correction pressure of the lenses at the back end of the optical system, and at the same time, it is beneficial to correct the aperture aberration.

[0019] In one embodiment, the optical system satisfies the relation: 0.4 ≤ (R13 - R14) / (R13 + R14) ≤ 1.4; where R13 is the curvature radius of the object side surface of the seventh lens on the optical axis, and R14 is the curvature radius of the image side surface of the seventh lens on the optical axis. By making the optical system satisfy the above relation, it is beneficial to control the shape of the seventh lens, to comprehensively balance the spherical aberration, chromatic aberration and field curvature of the optical system, and to reduce the risk of ghost imaging, to improve the resolution ability of the optical system.

[0020] In one embodiment, the optical system satisfies the relation: 3 ≤ F2 / CT2 ≤ 3.9; where F2 is the effective focal length of the second lens, and CT2 is the thickness of the second lens on the optical axis. By making the optical system satisfy the above relation, the ratio of the effective focal length of the second lens to the thickness of the second lens on the optical axis is reasonably configured, which is beneficial to simplify the surface shape setting of the second lens.

[0021] In one embodiment, the optical system satisfies the relation: -5 ≤ F5 / CT5 ≤ -2; where F5 is the effective focal length of the fifth lens, and CT5 is the thickness of the fifth lens on the optical axis. By making the optical system satisfy the above relation, the ratio of the effective focal length of the fifth lens to the thickness of the fifth lens on the optical axis is reasonably configured, which is beneficial to simplifying the surface shape setting of the fifth lens.

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

[0023] In one embodiment, the optical system satisfies the relation: 0.12 ≤ (CT4 + CT5) / TTL ≤ 0.24; where CT4 is the thickness of the fourth lens on the optical axis, and CT5 is the thickness of the fifth lens on the optical axis. By making the optical system satisfy the above relation, it is beneficial to enhance the light control ability of the fourth lens and the fifth lens, beneficial to regulating more light to enter the rear system, and improving the relative illumination.

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

[0025] In one embodiment, the optical system satisfies the relation: 0.3 ≤ CT5 / CT4 ≤ 1.1; where CT5 is the thickness of the fifth lens on the optical axis, and CT4 is the thickness of the fourth lens on the optical axis. By making the optical system satisfy the above relation, the ratio of the thickness of the fifth lens on the optical axis to 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, maintaining the characteristic of miniaturization of the optical system.

[0026] In one embodiment, the optical system satisfies the relation: 0.4 ≤ R11 / (R12 + CT6) ≤ 0.75; where R11 is the curvature radius of the object side of the sixth lens at the optical axis, R12 is the curvature radius 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. By making the optical system satisfy the above relation, the ratio of the curvature radius of the object side of the sixth lens at the optical axis to the curvature radius of the image side 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, conducive to the smooth transition of the light ray trend to the seventh lens, and reducing the light energy loss.

[0027] In one embodiment, the optical system satisfies the relation: -3.5 ≤ CT1 / SAG1 ≤ -1.5; where CT1 is the thickness of the first lens on the optical axis, and SAG1 is the sag of the object side of the first lens at the maximum effective aperture. By making the optical system satisfy the above relation, it is conducive to reasonably controlling the refractive power and thickness of the first lens in the direction perpendicular to the optical axis, avoiding the first lens being too thick or too thin, and reducing the tolerance sensitivity of the optical system.

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

[0029] In one embodiment, the optical system satisfies the relation: 28 ≤ 180*TTL / IMGH / FOV ≤ 39. By making the optical system satisfy the above relation, it is conducive to achieving a balance between the optical system in terms of large image height, long focal length and miniaturization, and enabling the optical system to meet the market demands of large target surface and miniaturization at the same time.

[0030] In one embodiment, the optical system satisfies the relation: 0.95 ≤ IMGH / (F×Tan(FOV / 2)) ≤ 1.1; where F is the effective focal length of the optical system. By making the optical system satisfy the above relation, it is conducive to controlling the optical distortion of the optical system within a small range and conducive to improving the imaging quality of the optical system.

[0031] In one embodiment, the optical system satisfies the relation: 0.3 ≤ IMGH / F ≤ 0.45. By making the optical system satisfy the above relation, 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 conducive to the optical system obtaining a larger imaging surface and conducive to improving the imaging quality of the optical system.

[0032] In a second aspect, the present invention further provides an imaging module, which includes an image sensor chip and the optical system according to any one of the embodiments of the first aspect. The image sensor chip is disposed on the image side of the optical system. Among them, the image sensor chip can be a Complementary Metal Oxide Semiconductor (CMOS) or a Charge-coupled Device (CCD). The photosensitive surface of the image sensor chip is located on the imaging surface of the optical system, and the light of the object incident on the photosensitive surface through the lens can be converted into an electrical signal of an image. The imaging module can be an imaging module integrated on an electronic device or an independent lens. By introducing the optical system provided by the present invention into the imaging module, it is possible to reasonably configure the surface shape and refractive power of each lens in the optical system, so that the imaging module has the characteristics of high imaging clarity, large field of view, and miniaturization.

[0033] In a third aspect, the present invention further provides an electronic device, which includes a housing and the imaging module according to the second aspect. The imaging module is disposed in the housing. The electronic device includes, but is not limited to, an automobile, a monitoring device, a smart phone, a smart watch, and a computer, etc. By adding the imaging module provided by the present invention to the electronic device, the electronic device has the characteristics of high imaging clarity, large field of view, and miniaturization. Description of the Drawings

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

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

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

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

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

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

[0040] Figure 6 Shows the longitudinal spherical aberration curve graph, astigmatism curve graph, and distortion curve graph of the optical system of the third embodiment;

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

[0042] Figure 8 Shows the longitudinal spherical aberration curve graph, astigmatism curve graph, and distortion curve graph of the optical system of the fourth embodiment;

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

[0044] Figure 10 Shows the longitudinal spherical aberration curve graph, astigmatism curve graph, and distortion curve graph of the optical system of the fifth embodiment;

[0045] Figure 11 Shows a schematic structural diagram of an imaging module in an embodiment of the present invention;

[0046] Figure 12 Shows a schematic structural diagram of an electronic device in an embodiment of the present invention. Specific embodiments

[0047] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0048] In a first aspect, the present invention provides an optical system, which has seven lenses with refractive power, and successively includes, 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 near the optical axis, and the image side surface of the first lens is convex near the optical axis; a second lens with positive refractive power, the object side surface of the second lens is convex near the optical axis, and the image side surface of the second lens is convex near the optical axis; a third lens with positive refractive power, the object side surface of the third lens is convex near the optical axis, and the image side surface of the third lens is convex near the optical axis; a fourth lens with 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; a fifth lens with 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; a sixth lens with 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; a seventh lens with positive or negative refractive power, the object side surface of the seventh lens can be convex, concave or flat near the optical axis, and the image side surface of the seventh lens can be convex, concave or flat near the optical axis.

[0049] The optical system satisfies the relationship: 30deg ≤ FOV ≤ 50deg, 7.1 ≤ TTL / IMGH ≤ 7.5; where 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 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 a negative refractive power, with the object side of the first lens being concave near the optical axis and the image side of the first lens being convex near the optical axis, it is beneficial to diverge light. The light emerging from the image side of the first lens can provide a larger light acceptance surface for the subsequent optical system, reducing the front aperture; by making the second lens have a positive refractive power, with the object side of the second lens being convex near the optical axis and the image side of the second lens being convex near the optical axis, it is beneficial to converge light. When paired with the first lens having a negative focal power, it can reduce the total length of the fixed-focus lens, and the converging effect on light can further reduce the rear aperture; by making the third lens have a positive refractive power, with the object side of the third lens being convex near the optical axis and the image side of the third lens being convex near the optical axis, it is beneficial to receive the light converged by the second lens, reduce the height of the light beam when it enters the object side of the fourth lens, and reduce the aperture of the object side of the fourth lens. At the same time, it is beneficial to correct the diaphragm aberration; by making the fourth lens have a positive refractive power, with the object side of the fourth lens being convex near the optical axis and the image side of the fourth lens being convex near the optical axis, it is beneficial to reduce the angle between the incident light of the marginal field of view and the surface normal of the object side, avoiding light divergence; by making the fifth lens have a negative refractive power, with the object side of the fifth lens being concave near the optical axis and the image side of the fifth lens being concave near the optical axis, it is beneficial to effectively collect and compress the incident light on the object side of the fifth lens, enabling the light to smoothly transition to the optical system on the image side of the fifth lens; by making the sixth lens have a positive refractive power, with the object side of the sixth lens being convex near the optical axis and the image side of the sixth lens being concave near the optical axis, it is beneficial for the light to smoothly enter the seventh lens, reducing the sensitivity of the fixed-focus lens.

[0051] 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, which can avoid introducing excessive aberrations and is beneficial for the optical system to meet the characteristics of miniaturization while obtaining sufficient field of view. 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 to the image height of the optical system is reasonably configured. Combining with the above range of the maximum field of view angle of the optical system, it is beneficial to limit the total length of the optical system and achieve the miniaturization of the optical system.

[0053] In one embodiment, the optical system satisfies the relation: 2.2 ≤ TTL / F ≤ 3.1; where F is the 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 relation, it is beneficial to reasonably configure the ratio of the distance from the object side surface of the first lens to the imaging surface of the optical system on the optical axis to the effective focal length of the optical system, so that the optical system has a smaller overall optical length and realizes the characteristic of miniaturization.

[0054] In one embodiment, the optical system satisfies the relation: 2.9 ≤ SD1 / IMGH / Tan(FOV / 2) ≤ 4.2; where SD1 is half of the maximum effective aperture of the object side surface 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 relation, it is beneficial to ensure the balance among the front aperture size, the field of view angle, and the image plane of the optical system, and is beneficial to improving the resolution.

[0055] In one embodiment, the optical system satisfies the relation: 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 relation, the ratio of the field of view angle to the f-number of the optical system is reasonably configured, realizing the combined effect of a larger field of view angle and a large aperture of the optical system. The optical system has a reasonable light input amount, improves the overall illuminance of the imaging picture, and makes the optical system suitable for different lighting environments.

[0056] In one embodiment, the optical system satisfies the relation: 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 relation, the ratio of the thickness of the first lens on the optical axis to 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 to maintain the characteristic of miniaturization of the optical system.

[0057] In one embodiment, the optical system satisfies the relation: -2.2 ≤ F1 / F ≤ -1.4; where F is the effective focal length of the optical system, and F1 is the 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 making the optical system satisfy the above relation, it is beneficial for the refractive power of the first lens to be properly matched in the optical system, and the surface shape design of the first lens is more simple and flexible. At the same time, it is also beneficial for diverging light, and the light rays exiting from the image side of the first lens can enable the subsequent optical system to have a larger light receiving surface, simplifying the overall aberration correction of the optical system and the balance of imaging quality.

[0058] In one embodiment, the optical system satisfies the relation: 1.4 ≤ F2 / F ≤ 1.92; where F is the effective focal length of the optical system, and F2 is the 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 making the optical system satisfy the above relation, it is beneficial for the refractive power of the second lens to be properly matched in the optical system, and the surface shape design of the second lens is more simple and flexible, reducing aberration, simplifying the overall aberration correction of the optical system and the balance of imaging quality.

[0059] In one embodiment, the optical system satisfies the relation: 4.5 ≤ R2 / R1 ≤ 10; where R1 is the curvature radius of the object side of the first lens at the optical axis, and R2 is the curvature radius of the image side 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 making the optical system satisfy the above relation, it is beneficial for the ratio of the curvature radius of the image side of the first lens at the optical axis to the curvature radius of the object side of the first lens at the optical axis to be reasonably configured, controlling the shape of the first lens, comprehensively balancing the spherical aberration, chromatic aberration, and field curvature of the optical system, and reducing the risk of ghost imaging, improving the resolution ability of the optical system. At the same time, it is also beneficial for reducing the processing difficulty of the first lens.

[0060] In one embodiment, the optical system satisfies the relation: 1 ≤ |(R5 - R6) / (R5 + R6)| ≤ 45; where R5 is the radius of curvature of the object side surface of the third lens on the optical axis, and R6 is the radius of curvature of the image side surface of the third lens on 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 relation, it is beneficial to collect and compress the incident light in front, enable the light to smoothly transition to the optical system at the rear, reduce the aberration correction pressure of the rear lens of the optical system, and at the same time is beneficial to correcting the aperture aberration.

[0061] In one embodiment, the optical system satisfies the relation: 0.4 ≤ (R13 - R14) / (R13 + R14) ≤ 1.4; where R13 is the radius of curvature of the object side surface of the seventh lens on the optical axis, and R14 is the radius of curvature of the image side surface of the seventh lens on 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 relation, 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, reduce the risk of generating ghost images, and improve the resolution ability of the optical system.

[0062] In one embodiment, the optical system satisfies the relation: 3 ≤ F2 / CT2 ≤ 3.9; where 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 relation, the ratio of the effective focal length of the second lens to the thickness of the second lens on the optical axis is reasonably configured, which is beneficial to simplifying the surface type setting of the second lens.

[0063] In one embodiment, the optical system satisfies the relation: -5 ≤ F5 / CT5 ≤ -2; where 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 relation, the ratio of the effective focal length of the fifth lens to the thickness of the fifth lens on the optical axis is reasonably configured, which is beneficial to simplifying the surface type setting of the fifth lens.

[0064] In one embodiment, the optical system satisfies the relation: 0.6 ≤ CT1 / ET1 ≤ 0.8; where CT1 is the thickness of the first lens on the optical axis, and ET1 is the edge thickness of the first lens, that is, the distance in the direction parallel to the optical axis from the maximum effective aperture of the object side of the first lens to the maximum effective aperture of the image side. 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 making the optical system satisfy the above relation, the ratio of the thickness of the first lens on the optical axis to the edge thickness of the first lens is reasonably configured, which is beneficial to simplifying the production and manufacturing of the first lens.

[0065] In one embodiment, the optical system satisfies the relation: 0.12 ≤ (CT4 + CT5) / TTL ≤ 0.24; where CT4 is the thickness of the fourth lens on the optical axis, and CT5 is the 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 making the optical system satisfy the above relation, it is beneficial to enhance the light control ability of the fourth lens and the fifth lens, is beneficial to regulating more light to enter the rear system, and improves the relative illumination.

[0066] In one embodiment, the optical system satisfies the relation: -1.5 ≤ (VD4 - VD5) / F45 ≤ -0.3; where 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 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 making the optical system satisfy the above relation, the ratio of the difference in Abbe numbers between the fourth lens and the fifth lens to the combined effective focal length of the fourth lens and the fifth lens is reasonably configured, which is beneficial to correcting the chromatic aberration of the optical system, restoring the authenticity of colors, and improving the imaging quality.

[0067] In one embodiment, the optical system satisfies the relation: 0.3 ≤ CT5 / CT4 ≤ 1.1; where CT5 is the thickness of the fifth lens on the optical axis, and CT4 is the 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 making the optical system satisfy the above relation, the ratio of the thickness of the fifth lens on the optical axis to 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, maintaining the characteristic of miniaturization of the optical system.

[0068] In one embodiment, the fourth lens and the fifth lens are cemented lenses, which is beneficial to correcting chromatic aberration and balancing various aberrations, improving the resolution of the optical system, effectively reducing the tolerance sensitivity, and enhancing the imaging quality of the optical system.

[0069] In one embodiment, the optical system satisfies the relationship: 0.4 ≤ R11 / (R12 + CT6) ≤ 0.75; where R11 is the curvature radius of the object side of the sixth lens at the optical axis, R12 is the curvature radius 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 curvature radius of the object side of the sixth lens at the optical axis to the curvature radius 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, facilitating the smooth transition of the light ray trend to the seventh lens, and reducing the light energy loss.

[0070] In one embodiment, the optical system satisfies the relationship: -3.5 ≤ CT1 / SAG1 ≤ -1.5; where CT1 is the thickness of the first lens on the optical axis, and SAG1 is the sagitta of the object side of the first lens at the maximum effective aperture, that is, the distance from the intersection of the object side of the first lens and the optical axis to 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, it is beneficial to reasonably control the refractive power and thickness of the first lens at various positions perpendicular to the optical axis, avoid the first lens being too thick or too thin, and reduce the tolerance sensitivity of the optical system.

[0071] In one embodiment, the optical system satisfies the relationship: 1.2 ≤ SD1 / IMGH ≤ 1.3; where 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 to half of the image height corresponding to the maximum field of view 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 relation: 28 ≤ 180 * TTL / IMGH / FOV ≤ 39; where 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 relation, it is beneficial to balance the optical system among large image height, long focal length, and miniaturization, and enable the optical system to meet the market demands of large target surface and miniaturization at the same time.

[0073] In one embodiment, the optical system satisfies the relation: 0.95 ≤ IMGH / (F × Tan(FOV / 2)) ≤ 1.1; where 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 relation, it is beneficial to control the optical distortion of the optical system within a small range and improve the imaging quality of the optical system.

[0074] In one embodiment, the optical system satisfies the relation: 0.3 ≤ IMGH / F ≤ 0.45; where 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 relation, 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 for the optical system to obtain a larger imaging surface and improve the imaging quality of the optical system.

[0075] In one embodiment, the optical system satisfies the relation: 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 relation, the aperture number of the optical system is set within a reasonable range, achieving the combined effect of a larger field of view angle and a large aperture for the optical system. The optical system has a reasonable light input amount, improving the overall illuminance of the imaging picture and making the optical system applicable to different lighting environments.

[0076] In one embodiment, the optical system satisfies the relation: 1.4 ≤ F3 / F ≤ 1.9; where 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 relation, it is beneficial for the refractive power of the third lens to be properly matched in the optical system, the surface shape design of the third lens to be more simple and flexible, to reduce aberration, and to simplify the aberration correction of the overall optical system and the balance of imaging quality.

[0077] In one embodiment, the optical system satisfies the relation: 0.8 ≤ F4 / F ≤ 1.2; where 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 relation, it is beneficial for the refractive power of the fourth lens to be properly matched in the optical system, the surface shape design of the fourth lens to be more simple and flexible, to reduce aberration, and to simplify the aberration correction of the overall optical system and the balance of imaging quality.

[0078] In one embodiment, the optical system satisfies the relation: -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 relation, it is beneficial for the refractive power of the fifth lens to be properly matched in the optical system, the surface shape design of the fifth lens to be more simple and flexible, to reduce aberration, and to simplify the aberration correction of the overall optical system and the balance of imaging quality.

[0079] In one embodiment, the optical system satisfies the relation: 1.8 ≤ F6 / F ≤ 8; where 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 relation, it is beneficial for the refractive power of the sixth lens to be properly matched in the optical system, the surface shape design of the sixth lens to be more simple and flexible, to reduce aberration, and to simplify the aberration correction of the overall optical system and the balance of imaging quality.

[0080] In one embodiment, the optical system satisfies the relation: 1.8 ≤ |F7 / F| ≤ 6; where F7 is the effective focal length of the seventh lens. Specifically, the value of |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 relation, it is beneficial for the refractive power of the seventh lens in the optical system to be properly matched, the surface shape design of the seventh lens to be more simple and flexible, the aberration to be reduced, and the overall aberration correction of the optical system and the balance of imaging quality to be simplified.

[0081] In one embodiment, the optical system satisfies the relation: -0.5 ≤ R3 / R4 ≤ -0.1; where R3 is the curvature radius of the object side of the second lens at the optical axis, and R4 is the curvature radius of the image side of the second lens at the optical axis. Specifically, the value of 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 relation, it is beneficial for the ratio of the curvature radius of the object side of the second lens at the optical axis to the curvature radius of the image side of the second lens at the optical axis to be reasonably configured, the shape of the second lens to be controlled, the spherical aberration, chromatic aberration and field curvature of the optical system to be comprehensively balanced, the risk of ghost imaging to be reduced, the resolution ability of the optical system to be improved, and at the same time, it is also beneficial for reducing the processing difficulty of the second lens.

[0082] In one embodiment, the optical system satisfies the relation: -7.5 ≤ R5 / R6 ≤ -0.9. Specifically, the value of 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 relation, it is beneficial for the ratio of the curvature radius of the object side of the third lens at the optical axis to the curvature radius of the image side of the third lens at the optical axis to be reasonably configured, the shape of the third lens to be controlled, the spherical aberration, chromatic aberration and field curvature of the optical system to be comprehensively balanced, the risk of ghost imaging to be reduced, the resolution ability of the optical system to be improved, and at the same time, it is also beneficial for reducing the processing difficulty of the third lens.

[0083] In one embodiment, the optical system satisfies the relation: -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 relation, it is beneficial to rationally configure the ratio of the radius of curvature of the object side surface of the fourth lens at the optical axis to the radius of curvature of the image side surface of the fourth lens at the optical axis, control the shape of the fourth lens, comprehensively balance the spherical aberration, chromatic aberration and field curvature of the optical system, and reduce the risk of ghosting, improve the resolution ability of the optical system. At the same time, it is also beneficial to reduce the processing difficulty of the fourth lens.

[0084] In one embodiment, the optical system satisfies the relation: -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 relation, it is beneficial to rationally configure the ratio of the radius of curvature of the object side surface of the fifth lens at the optical axis to the radius of curvature of the image side surface of the fifth lens at the optical axis, control the shape of the fifth lens, comprehensively balance the spherical aberration, chromatic aberration and field curvature of the optical system, and reduce the risk of ghosting, improve the resolution ability of the optical system. At the same time, it is also beneficial to reduce the processing difficulty of the fifth lens.

[0085] In one embodiment, the optical system satisfies the relation: 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 relation, it is beneficial to rationally configure the ratio of the radius of curvature of the object side surface of the sixth lens at the optical axis to the radius of curvature of the image side surface of the sixth lens at the optical axis, control the shape of the sixth lens, comprehensively balance the spherical aberration, chromatic aberration and field curvature of the optical system, and reduce the risk of ghosting, improve the resolution ability of the optical system. At the same time, it is also beneficial to reduce the processing difficulty of the sixth lens.

[0086] In one embodiment, the optical system satisfies the relationship: 4 ≤ R13 / R14 ≤ 120. Specifically, the value of R13 / R14 can be 4.952, 92.325, 75.961, 81.239, 100.845, 119.542, 23.452, 34.185, etc. By making the optical system satisfy the above relationship, it is beneficial to rationally configure the ratio of the curvature radius of the object side of the seventh lens at the optical axis to the curvature radius of the image side of the seventh lens at the optical axis, control the shape of the seventh lens, comprehensively balance the spherical aberration, chromatic aberration and field curvature of the optical system, reduce the risk of ghosting, improve the resolution ability of the optical system. At the same time, it is also beneficial to reduce the processing difficulty of the seventh lens.

[0087] In one embodiment, the optical system satisfies the relationship: 1.1 ≤ CT2 / ET2 ≤ 1.3; where ET2 is the edge thickness of the second lens, that is, the distance from the maximum effective aperture of the object side of the second lens to the maximum effective aperture of the image side in the direction parallel to the optical axis. Specifically, the value of CT2 / ET2 can be 1.163, 1.201, 1.197, 1.173, 1.236, 1.182, 1.215, 1.283, etc. By making the optical system satisfy the above relationship, the ratio of the thickness of the second lens on the optical axis to the edge thickness of the second lens is rationally configured, which is beneficial to simplify the production and manufacturing of the second lens.

[0088] In one embodiment, the optical system satisfies the relationship: 0.3 ≤ CT5 / ET5 ≤ 0.71; where ET5 is the edge thickness of the fifth lens, that is, the distance from the maximum effective aperture of the object side of the fifth lens to the maximum effective aperture of the image side in the direction parallel to the optical axis. Specifically, the value of CT5 / ET5 can be 0.323, 0.685, 0.641, 0.698, 0.594, 0.423, 0.456, 0.364, etc. By making the optical system satisfy the above relationship, the ratio of the thickness of the fifth lens on the optical axis to the edge thickness of the fifth lens is rationally configured, which is beneficial to simplify the production and manufacturing of the fifth lens.

[0089] In some embodiments, the optical system further includes a filter, which can be an infrared cut-off filter, an infrared band-pass filter or a dual-pass filter. In this application, an infrared cut-off filter is selected as the filter to filter out infrared light and only allow visible light to pass through, making the imaging more in line with the visual experience of the human eye. Of course, an infrared band-pass filter can also be selected as the filter, which is fixedly arranged relative to each lens in the optical system. The infrared band-pass filter is used to pass infrared light with a central wavelength and has the function of filtering out background stray light, and is used for infrared lenses. In addition, a dual-pass filter can also be selected as the filter, which can simultaneously transmit visible light and part of infrared light with high transmittance, so as to achieve different wavelength band selections, and can realize both visible light imaging and infrared imaging, so as to achieve day and night universality. The filter can be assembled with each lens to be a part of the optical system. In some other embodiments, the filter can also 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, or colored glass, or a filter of other materials, which can be selected according to actual needs and is not specifically limited in this embodiment.

[0090] In some embodiments, at least one lens in the optical system can have a spherical surface type. The design of the spherical surface type can reduce the preparation difficulty of the lens and the preparation cost. In some embodiments, at least one lens of the optical system can also have an aspherical surface type. When at least one side surface (object side or image side) of the lens is aspherical, the lens can be said to have an aspherical surface type. In some embodiments, the object side and the image side of each lens can also be designed as aspherical surfaces. The aspherical design can help the optical system more effectively eliminate aberration and improve the imaging quality. In some embodiments, in order to balance the preparation cost, preparation difficulty, imaging quality, assembly difficulty, etc., the surface design of each lens in the optical system can be a combination of spherical and aspherical surface types. In this application, the second lens and the seventh lens have an aspherical surface type, and the first lens, the third lens, the fourth lens, the fifth lens and the sixth lens have a spherical surface type.

[0091] In some embodiments, the material of at least one lens in the optical system is glass (GL, Glass). For example, the first lens L1 closest to the object side can be made of glass. By utilizing the effect of reducing temperature drift of the glass material of the first lens L1, the influence of environmental temperature changes on the optical system can be effectively reduced, thereby maintaining better and more stable imaging quality. In some embodiments, the material of at least one lens in the optical system can also be plastic (PC, Plastic), and the plastic material can be polycarbonate, gum, etc. The lens with plastic material can reduce the production cost of the optical system, while the lens with glass material can withstand higher or lower temperatures and has excellent optical effects and better stability. In some embodiments, lenses of different materials can be arranged in the optical system, that is, a design combining glass lenses and plastic lenses can be adopted, but the specific configuration relationship can be determined according to actual needs and will not be elaborated here.

[0092] The first embodiment

[0093] Please refer to Figure 1 , the optical system 10 of this embodiment includes, in order from the object side to the image side along the optical axis direction:

[0094] The first lens L1, having 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, having 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, having 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, having 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, having 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, having 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, having 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 includes a stop STO, an infrared filter IR, a protective glass CG, and an imaging surface IMG. In this embodiment, the stop STO is disposed between the image side of the second lens L2 and the object side of the third lens L3 of the optical system 10 for controlling the amount of incident light. The infrared filter IR is disposed between the seventh lens L7 and the protective glass CG. It includes an object side S15 and an image side S16. The infrared filter IR is an infrared cut-off filter, which is used to filter out infrared light so that the light incident on the imaging surface IMG is visible light. The wavelength of the visible light is 380nm - 780nm. The material of the infrared cut-off filter can be glass

[0102] (Glass) or plastic (Plastic), and can be coated on its surface. The protective glass CG is disposed between the infrared filter IR and the imaging surface IMG. It includes 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 on the imaging surface. An infrared light-sensitive chip is disposed at the imaging surface IMG. The photosensitive chip captures different band information of the object for subsequent processing.

[0103] Table 1a shows the parameters of the optical system 10 of this embodiment. Among them, 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 numbers S1 and S2 are the object side S1 and the image side S2 of the first lens L1 respectively. That is, in the same lens, the surface with the smaller surface number is the object side, and the surface with the larger surface number is the image side. The first value in the "thickness" parameter column of the first lens L1 is the thickness of the lens on the optical axis, and the second value is the distance on the optical axis from the image side of the lens to the subsequent surface in the image side direction. The focal length, material refractive index, and Abbe number are all obtained using visible light with a reference wavelength of 555nm. The units of the Y radius, thickness, and effective focal length are all millimeters (mm).

[0104] Table 1a

[0105]

[0106]

[0107] Among them, F is the effective focal length of the optical system 10, FNO is the f-number of the optical system 10, FOV is the maximum field of view angle of the optical system 10, and TTL is the distance on the optical axis from the object side S1 of the first lens to the imaging surface IMG, that is, the total optical length.

[0108] In this embodiment, both the object side and the image side of the second lens L2 are aspherical surfaces, and both the object side and the image side of the seventh lens L7 are aspherical surfaces. The surface profile x of the aspherical surface can be defined by, but not limited to, the following aspherical formula:

[0109]

[0110] Among them, x is the distance from the corresponding point on the aspherical surface to the plane tangent to the surface vertex, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the aspherical vertex, 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 that can be used in the first embodiment;

[0112] Table 1b

[0113]

[0114] Figure 2 Figure (a) shows the longitudinal spherical aberration curves of the optical system 10 of the first embodiment at wavelengths of 660.0000 nm, 610.0000 nm, 555.0000 nm, 510.0000 nm, and 455.0000 nm. Among them, the abscissa along the X-axis direction represents the focus shift, that is, the distance from the imaging plane to the intersection point of the light ray and the optical axis (unit: mm), and the ordinate along the Y-axis direction represents the normalized field of view. The longitudinal spherical aberration curve represents the deviation of the convergent focal points of light rays of different wavelengths after passing through each lens of the optical system 10. Figure 2 As can be seen from Figure (a), the deviation degrees of the convergent focal points of the light rays of each wavelength in the first embodiment tend to be consistent, and the blur spots or chromatic halos in the imaging picture are effectively suppressed in the optical system 10, indicating that the imaging quality of the optical system 10 in this embodiment is good.

[0115] Figure 2 Figure (b) also shows the astigmatism curve of the optical system 10 of the first embodiment at a wavelength of 555.0000 nm. Among them, the abscissa along the X-axis direction represents the focus shift, and the ordinate along the Y-axis direction represents the field angle, and its unit is deg. The S curve in the astigmatism curve represents the sagittal field curvature at 555.0000 nm, and the T curve represents the meridional field curvature at 555.0000 nm. Figure 2 As can be seen from Figure (b), the field curvature of the optical system 10 is small, the field curvature and astigmatism of each field of view are well corrected, and both the center and the edge of the field of view have clear imaging.

[0116] Figure 2 Figure (c) also shows the distortion curve of the optical system 10 of the first embodiment at a wavelength of 555.0000 nm. Among them, the abscissa along the X-axis direction represents the distortion value, and the ordinate along the Y-axis direction represents the field angle, and the unit is deg. The distortion curve represents the distortion magnitude values corresponding to different field angles.Figure 2 As can be seen from Fig. (c), at a wavelength of 546.0000 nm, the image distortion caused by the main beam is small, and the imaging quality of the system is excellent.

[0117] From Figure 2 Fig. (a), Figure 2 Fig. (b) and Figure 2 Fig. (c), it can be seen that the optical system 10 of this embodiment has small aberration and good imaging quality, and has good imaging performance.

[0118] Second Embodiment

[0119] Please refer to Figure 3 , the optical system 10 of this embodiment sequentially includes, 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 surface S1 of the first lens L1 is concave near the optical axis, and the image surface S2 is convex near the optical axis.

[0121] The second lens L2 has a positive refractive power. The object surface S3 of the second lens L2 is convex near the optical axis, and the image surface S4 is convex near the optical axis.

[0122] The third lens L3 has a positive refractive power. The object surface S5 of the third lens L3 is convex near the optical axis, and the image surface S6 is convex near the optical axis.

[0123] The fourth lens L4 has a positive refractive power. The object surface S7 of the fourth lens L4 is convex near the optical axis, and the image surface S8 is convex near the optical axis.

[0124] The fifth lens L5 has a negative refractive power. The object surface S9 of the fifth lens L5 is concave near the optical axis, and the image surface S10 is concave near the optical axis.

[0125] The sixth lens L6 has a positive refractive power. The object surface S11 of the sixth lens L6 is convex near the optical axis, and the image surface S12 is concave near the optical axis.

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

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

[0128] Table 2a shows the parameters of the optical system 10 of this embodiment. Among them, the focal length, material refractive index, and Abbe number are all obtained with visible light having a reference wavelength of 555 nm. The units of the Y radius, thickness, and effective focal length are all millimeters (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 coefficients of higher-order terms that can be used for each aspherical mirror surface in the second embodiment. Among them, each aspherical surface type can be defined by the formula given in the first embodiment;

[0133] Table 2b

[0134]

[0135] Figure 4 in (a), Figure 4 in (b), Figure 4 in (c) respectively show the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system 10 of the second embodiment. Among them, the longitudinal spherical aberration curve represents the deviation of the convergence 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 sagittal field curvature; the distortion curve represents the distortion magnitude values corresponding to different field angles. From Figure 4 the aberration diagram in, it can be seen that the longitudinal spherical aberration, field curvature and distortion of the optical system 10 are all well controlled, so that the optical system 10 of this embodiment has good imaging quality.

[0136] Third Embodiment

[0137] Please refer to Figure 5 , the optical system 10 of this embodiment sequentially includes, 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 near the optical axis, and the image side surface S2 is convex near 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 near the optical axis, and the image side surface S4 is convex near 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 near the optical axis, and the image side surface S6 is convex near 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 near the optical axis, and the image side surface S8 is convex near 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 near the optical axis, and the image side surface S10 is concave near the optical axis.

[0143] 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.

[0144] The seventh lens L7 has a positive refractive power. The object side surface S13 of the seventh lens L7 is concave near the optical axis, and the image side surface S14 is convex near the optical axis.

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

[0146] Table 3a shows the parameters of the optical system 10 of this embodiment. Among them, the focal length, material refractive index, and Abbe number are all obtained with visible light having a reference wavelength of 555 nm. The units of the Y radius, thickness, and effective focal length are all millimeters (mm), and the meanings of the other parameters are the same as those of the first embodiment;

[0147] Table 3a

[0148]

[0149] Table 3b gives the high-order term coefficients of the aspherical mirror surfaces that can be used in the third embodiment. Among them, the aspherical surface types can be defined by the formulas given in the first embodiment;

[0150] Table 3b

[0151]

[0152] Figure 6 In (a), Figure 6 In (b), Figure 6 In (c) respectively show the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system 10 of the third embodiment. Among them, the longitudinal spherical aberration curve represents the deviation of the convergence focal points of light rays of different wavelengths after passing through the lenses of the optical system 10; the astigmatism curve represents the meridional field curvature and sagittal field curvature; the distortion curve represents the distortion magnitude values corresponding to different field angles. From Figure 6 the aberration diagrams, it can be seen that the longitudinal spherical aberration, field curvature, and distortion of the optical system 10 are all well controlled, so that the optical system 10 of this embodiment has good imaging quality.

[0153] Fourth Embodiment

[0154] Please refer to Figure 7 , the optical system 10 of this embodiment includes, in order from the object side to the image side along the optical axis direction:

[0155] 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.

[0156] 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 of the second lens L2 is convex near the optical axis.

[0157] 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 of the third lens L3 is convex near the optical axis.

[0158] 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 of the fourth lens L4 is convex near the optical axis.

[0159] 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 of the fifth lens L5 is concave near the optical axis.

[0160] 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 of the sixth lens L6 is concave near the optical axis.

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

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

[0163] Table 4a shows the parameters of the optical system 10 of this embodiment. Among them, the focal length, material refractive index, and Abbe number are all obtained with visible light having a reference wavelength of 555 nm. The units of the Y radius, thickness, and effective focal length are all millimeters (mm), and the meanings of the other parameters are the same as those of the parameters in the first embodiment;

[0164] Table 4a

[0165]

[0166]

[0167] Table 4b gives the high-order term coefficients that can be used for each aspherical mirror surface in the fourth embodiment. Among them, each 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 8Figures (c) respectively show the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system 10 of the fourth embodiment. Among them, 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 sagittal field curvature; the distortion curve represents the distortion magnitude values corresponding to different field angles. From Figure 8 the aberration diagrams in, it can be seen that the longitudinal spherical aberration, field curvature, and distortion of the optical system 10 are all well controlled, so that the optical system 10 of this embodiment has good imaging quality.

[0171] Fifth Embodiment

[0172] Please refer to Figure 9 , the optical system 10 of this embodiment successively includes, from the object side to the image side along the optical axis direction:

[0173] The first lens L1, having 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.

[0174] The second lens L2, having 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.

[0175] The third lens L3, having 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.

[0176] The fourth lens L4, having 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.

[0177] The fifth lens L5, having 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.

[0178] The sixth lens L6, having 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.

[0179] The seventh lens L7, having a positive refractive power, the object side surface S13 of the seventh lens L7 is concave near the optical axis, and the image side surface S14 is convex near the optical axis.

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

[0181] Table 5a

[0182]

[0183] Table 5b gives the coefficients of the higher-order terms that can be used for each aspherical mirror surface in the fifth embodiment. Among them, each aspherical surface type can be defined by the formula given in the first embodiment;

[0184] Table 5b

[0185]

[0186] Figure 10 In (a), Figure 10 In (b), Figure 10 In (c), the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system 10 of the fifth embodiment are respectively shown. Among them, the longitudinal spherical aberration curve represents the deviation of the convergence 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 sagittal field curvature; the distortion curve represents the distortion magnitude values corresponding to different field angles. From Figure 10 the aberration diagrams in, it can be seen that the longitudinal spherical aberration, field curvature, and distortion of the optical system 10 are all well controlled, so that the optical system 10 of this embodiment has good imaging quality.

[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, IMGH / (F×Tan(FOV / 2)), IMGH / 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 embodiment to the fifth embodiment;

[0188] Table 6

[0189]

[0190]

[0191] As can be seen from Table 6, the optical systems of the first to fifth embodiments all satisfy the following relationships: 30deg ≤ FOV ≤ 50deg, 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] Please refer to Figure 11, the present invention also provides an imaging module 20, which includes an image sensor chip 21 and the optical system 10 described in any one of the above embodiments. The image sensor chip 21 is disposed on the image side of the optical system 10. Among them, the photosensitive surface of the image sensor chip 21 is located on the imaging surface of the optical system 10, and the light of the object incident on the photosensitive surface through the lens can be converted into an electrical signal of an image. The image sensor chip 21 can be a Complementary Metal Oxide Semiconductor (CMOS) or a Charge-coupled Device (CCD). The imaging module 20 can be an imaging module integrated on the electronic device 30 or an independent lens. By adding the optical system 10 provided by the present invention to the imaging module 20, it is possible to reasonably design the surface shape and refractive power of each lens in the optical system 10, so that the imaging module 20 has the characteristics of high imaging clarity, large field of view angle and miniaturization.

[0193] Please refer to Figure 12 , the present invention also provides an electronic device 30, which includes a housing 31 and the above imaging module 20. The imaging module 20 is disposed in the housing 31. The electronic device 30 includes, but is not limited to, an automobile, a monitoring device, a smart phone, a computer, a smart watch, etc. By adding the imaging module 20 provided by the present invention to the electronic device 30, the electronic device 30 has the characteristics of high imaging clarity, large field of view angle and miniaturization.

[0194] The above-disclosed are only some preferred embodiments of the present invention. Of course, the scope of the rights of the present invention cannot be limited thereby. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. An optical system, characterized in that, There are a total of seven lenses with refractive power, which successively include, from the object side to the image side along the optical axis: The first lens, which has negative refractive power. The object side surface of the first lens is concave near the optical axis, and the image side surface of the first lens is convex near the optical axis. The second lens, which has positive refractive power. The object side surface of the second lens is convex near the optical axis, and the image side surface of the second lens is convex near the optical axis. The third lens, which has positive refractive power. The object side surface of the third lens is convex near the optical axis, and the image side surface of the third lens is convex near the optical axis. The fourth lens, which 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, which 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, which 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, which has positive refractive power or negative refractive power. The optical system satisfies the relationships: 30deg ≤ FOV ≤ 50deg, 7.1 ≤ TTL / IMGH ≤ 7.5; where, 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.

2. The optical system according to claim 1, wherein The optical system satisfies the relationships: 2.2 ≤ TTL / F ≤ 3.1; and / or, 2.9 ≤ SD1 / IMGH / Tan(FOV / 2) ≤ 4.2; and / or, 20deg ≤ FOV / FNO ≤ 30deg; where, SD1 is half of the maximum effective aperture of the object side surface of the first lens, FNO is the f-number of the optical system, and F is the effective focal length of the optical system.

3. The optical system according to claim 1, characterized in that The optical system satisfies the relationships: 1.4 ≤ CT2 / CT1 ≤ 3.1; and / or, -2.2 ≤ F1 / F ≤ -1.4; and / or, 1.4 ≤ F2 / F ≤ 1.92; where, 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 according to claim 1, characterized in that, The optical system satisfies the relationships: 4.5 ≤ R2 / R1 ≤ 10; and / or, 1 ≤ |(R5 - R6) / (R5 + R6)| ≤ 45; and / or, 0.4 ≤ (R13 - R14) / (R13 + R14) ≤ 1.4; where, R1 is the radius of curvature of the object side surface of the first lens on the optical axis, R2 is the radius of curvature of the image side surface of the first lens on the optical axis, R5 is the radius of curvature of the object side surface of the third lens on the optical axis, R6 is the radius of curvature of the image side surface of the third lens on the optical axis, R13 is the radius of curvature of the object side surface of the seventh lens on the optical axis, and R14 is the radius of curvature of the image side surface of the seventh lens on the optical axis.

5. The optical system according to claim 1, characterized in that, The optical system satisfies the relationships: 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 according to claim 1, characterized in that, The optical system satisfies the relationship: 0.12 ≤ (CT4 + CT5) / TTL ≤ 0.24; and / or, -1.5 mm -1 ≤(VD4 - VD5) / F45 ≤ -0.3 mm -1 ; 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 lens and the fifth lens.

7. The optical system according to claim 1, wherein The optical system satisfies the 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 curvature radius of the object side surface of the sixth lens at the optical axis, R12 is the curvature radius of the image side surface 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 sagitta at the maximum effective aperture of the object side surface of the first lens, and SD1 is half of the maximum effective aperture of the object side surface of the first lens.

8. The optical system according to claim 1, characterized in that, The optical system satisfies the 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; wherein, F is the effective focal length of the optical system.

9. An imaging module, characterized in that, Comprising a photosensitive chip and the optical system according to any one of claims 1 to 8, the photosensitive chip being located on the image side of the optical system.

10. An electronic device, characterized in that, The electronic device includes a housing and the imaging module according to claim 9, the imaging module being disposed within the housing.

Images