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: a first lens to a seventh lens having refractive power, the first lens and a fifth lens having negative refractive power, and the second lens, the third lens, the fourth lens and a sixth lens having positive refractive power, the object-side surface and the image-side surface of the first lens, the object-side surface and the image-side surface of the fifth lens, the image-side surface of the sixth lens and the object-side surface of the seventh lens are concave surfaces near the optical axis. The object-side surface and the image-side surface of the second lens, the object-side surface and the image-side surface of the third lens, the object-side surface and the image-side surface of the fourth lens, the object-side surface of the sixth lens and the image-side surface of the seventh lens are convex surfaces in a paraxial region. Through reasonable design of the surface type and the refractive power of each lens of the optical system, the characteristics of large aperture, high relative illumination and large field angle can be satisfied.

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 automotive assisted driving technology, optical systems are widely used in automobiles. Especially in fields such as in-vehicle rearview imaging systems, dash cams, automatic parking systems, panoramic imaging systems, and road navigation, optical systems have become indispensable key components.

[0003] In an autonomous driving assistance system, in-vehicle optical systems play a crucial role in capturing and transmitting information about the surrounding environment. With the continuous progress of autonomous driving technology, the requirements for forward-looking optical systems are also constantly increasing, and they need to have properties such as high resolution, large image circle, and low distortion. In addition, with the increasing demand for night driving, the performance of in-vehicle lenses in low-light environments has become particularly important. Therefore, the market urgently needs a miniaturized optical system with a large aperture, high relative illumination, a large field of view, and high imaging clarity to meet the requirements of modern automotive forward-looking systems. 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 in-vehicle optical systems need to have a large aperture, high relative illumination, and a large field of view.

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

[0006] In a first aspect, the present invention provides an optical system, which has a total of seven lenses with refractive power. Along the optical axis from the object side to the image side, it successively includes: 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 concave 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 is concave near the optical axis, and the image side surface of the seventh lens is convex near the optical axis.

[0007] The optical system satisfies the relationship: 1.65 ≤ FNO ≤ 1.75, 34deg ≤ FOV ≤ 50deg; where FNO is the f-number of the optical system and FOV is 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 concave near the optical axis, it is beneficial for the light to enter smoothly, preventing the light from bending too much, effectively reducing the field curvature and astigmatism of the optical system, and reducing the overall sensitivity of the optical system; 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 for initially correcting the astigmatism of the optical system and effectively controlling the trend of the light, achieving a larger 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 for collecting and compressing the incident light on the object side, enabling the light to transition smoothly to the optical system on the image side; 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 third lens being convex near the optical axis, it provides a reasonable light incident angle for the introduction of marginal rays; by making the fifth lens have a negative refractive power, with the object side of the third lens being concave near the optical axis and the image side of the third lens being concave near the optical axis, it is beneficial for the marginal rays to enter and be refracted, reducing the refraction angle borne by the subsequent lenses, making the refraction angles of the light on each lens more uniform, and effectively correcting the aberration of the marginal field of view; the fourth lens and the fifth lens are cemented lenses, which is beneficial for correcting chromatic aberration and balancing various aberrations, improving the resolution ability of the optical system, and effectively reducing the tolerance sensitivity, enhancing the imaging quality of the optical system; 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 depressing the light incident angle after passing through the aperture stop, enabling more light to enter the optical system on the image side, and increasing the illuminance of the optical system; by making the seventh lens have a positive or negative refractive power, with the object side of the seventh lens being concave near the optical axis and the image side of the seventh lens being convex near the optical axis, through specific surface shape matching and reasonable refractive power distribution, it can improve the imaging quality of the optical system, reduce aberrations, and enhance the imaging quality of the optical system.

[0009] By making the optical system satisfy the relationship: 1.65 ≤ FNO ≤ 1.75, the f-number of the optical system is set within a reasonable range, improving the light transmission ability of the optical system, making the relative illuminance of the optical system higher, enabling it to have good imaging quality even in darker environments such as at night or on rainy and cloudy days, and meeting the requirements of a large aperture and high resolution.

[0010] By making the optical system satisfy the relation: 34deg ≤ 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 satisfy the miniaturization characteristics while obtaining a sufficient field of view.

[0011] In one embodiment, the optical system satisfies the relation: 2.2 ≤ TTL / F ≤ 3.1; where TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, and F is the effective focal length of the optical system. By making the optical system satisfy the above 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 miniaturization characteristics.

[0012] In one embodiment, the optical system satisfies the relation: 3.6 ≤ CTMAX / CTMIN ≤ 6; where CTMAX is the maximum value of the thicknesses on the optical axis among the first lens to the seventh lens, and CTMIN is the minimum value of the thicknesses on the optical axis among the first lens to the seventh lens. By making the optical system satisfy the above relation, it is beneficial to reasonably control the ratio of the maximum center thickness to the minimum center thickness among the first lens to the seventh lens, which can make the thickness distribution of the lenses more uniform, thereby being beneficial to improving the spatial layout and processability of the optical system.

[0013] In one embodiment, the optical system satisfies the relation: 6 ≤ TTL / IMGH ≤ 8.5; where IMGH is half of the image height corresponding to the maximum field of view angle of the optical system. By making the optical system satisfy the above relation, under a certain image height of the optical system, by controlling the ratio of the image height to the focal length of the optical system, the optical system is restricted to have a smaller overall length to realize the miniaturization characteristics.

[0014] In one embodiment, the optical system satisfies the relation: 1.2 ≤ SD1 / SD14 ≤ 1.8; where SD1 is half of the maximum effective aperture of the object side surface of the first lens, and SD14 is half of the maximum effective aperture of the image side surface of the seventh lens. By making the optical system satisfy the above relation, it is beneficial to constrain the light path of the optical system, and it is beneficial to avoid a large step structure between the first lens and the seventh lens, reduce the deflection angle of the light, avoid introducing excessive aberrations, be beneficial to improving the imaging quality, and be beneficial to improving the assembly stability of the optical system.

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

[0016] In one embodiment, the optical system satisfies the relation: 0.15 ≤ BFL / F ≤ 0.3; where BFL is the distance from the image side of the seventh lens to the imaging surface of the optical system on the optical axis. By making the optical system satisfy the above relation, it is beneficial to balance between obtaining good imaging quality and an optical back focal length that is easy to assemble. While ensuring the imaging quality of the optical system, interference between the lens and other components is avoided, and the assembly process difficulty of the imaging module is reduced.

[0017] In one embodiment, the optical system satisfies the relation: 1 ≤ R3 / F ≤ 1.3; where R3 is the curvature radius of the object side of the second lens on the optical axis. By making the optical system satisfy the above relation, appropriately increasing the curvature radius of the object side of the second lens on the optical axis within a certain range can make the convex surface face the image side, further converge the light, suppress the edge field of view, and thus improve the imaging quality of the optical system.

[0018] In one embodiment, the optical system satisfies the relation: -5 ≤ F1 / CT1 ≤ -3; where F1 is the effective focal length of the first lens and CT1 is the thickness of the first lens on the optical axis. By making the optical system satisfy the above relation, it is beneficial to reasonably configure the refractive power and thickness of the first lens, so as to effectively control the incident angle of light in the optical system, reduce the sensitivity of the optical system, facilitate correcting the aberration generated by the optical system, and further facilitate improving the imaging quality of the optical system.

[0019] In one embodiment, the optical system satisfies the relation: 2.2 ≤ F4 / CT4 ≤ 2.9; where F4 is the effective focal length of the fourth lens and CT4 is the thickness of the fourth lens on the optical axis. By making the optical system satisfy the above relation, it is beneficial to reasonably configure the refractive power and thickness of the fourth lens, so as to effectively control the incident angle of light in the optical system, reduce the sensitivity of the optical system, facilitate correcting the aberration generated by the optical system, and further facilitate improving the imaging quality of the optical system.

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

[0021] In one embodiment, the optical system satisfies the relation: -4.5 ≤ R9 / R10 ≤ -1.5; where R9 is the curvature radius of the object side surface of the fifth lens on the optical axis, and R10 is the curvature radius of the image side surface of the fifth lens on the optical axis. By making the optical system satisfy the above relation, it is beneficial to reasonably configure the ratio of the curvature radius of the object side surface of the fifth lens on the optical axis to the curvature radius of the image side surface of the fifth lens on 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 generating ghost images, 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.

[0022] In one embodiment, the optical system satisfies the relation: 1.5 ≤ F6 / F ≤ 2.7; where F6 is the effective focal length of the sixth lens. By making the optical system satisfy the above relation, it is beneficial for the refractive power of the sixth lens in the optical system to be properly matched, the surface shape design of the sixth lens to be more simple and flexible, reduce aberration, and simplify the overall aberration correction of the optical system and the balance of imaging quality.

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

[0024] In one embodiment, the optical system satisfies the relation: 3 ≤ |(R5 - R6) / (R5 + R6)| ≤ 150; where R5 is the radius of curvature of the object side surface of the third lens at the optical axis, and R6 is the radius of curvature of the image side surface of the third lens at the optical axis. By making the optical system satisfy the above relation, it is beneficial for the optical system to receive the light rays diverged from the second lens and smoothly enter the rear; by moderately converging the light rays in front, the light rays can be made to have a gentle transition, reducing the loss of light energy, which is beneficial for the preliminary aberration correction of the incident light rays and for achieving high resolution and improving the resolution ability of the optical system.

[0025] In one embodiment, the optical system satisfies the relation: 1.7 ≤ F3 / F ≤ 2; where F3 is the effective focal length of the third lens. By making the optical system satisfy the above relation and reasonably setting the effective focal length of the third lens, the incident light rays in front can be effectively collected and compressed, enabling the light rays to smoothly transition to the optical system in the rear and reducing the generation of aberrations, thereby improving the imaging quality of the lens.

[0026] In one embodiment, the optical system satisfies the relation: -2.5 ≤ (SAG13 + SAG14) / CT7 ≤ -1; where SAG13 is the sagitta at the maximum effective aperture of the object side surface of the seventh lens, that is, the distance from the intersection of the object side surface of the seventh lens and the optical axis to the maximum effective aperture of the object side surface of the seventh lens in the direction parallel to the optical axis, SAG14 is the sagitta at the maximum effective aperture of the image side surface of the seventh lens, that is, the distance from the intersection of the image side surface of the seventh lens and the optical axis to the maximum effective aperture of the image side surface of the seventh lens in the direction parallel to the optical axis, and CT7 is the thickness of the seventh lens on the optical axis. By making the optical system satisfy the above relation, it helps to optimize the curvature, offset the field curvature caused by the first lens to the sixth lens, and effectively control the image height of the optical system.

[0027] In one embodiment, the optical system satisfies the relation: 0.5 ≤ R14 / R13 ≤ 5; where R13 is the radius of curvature of the object side surface of the seventh lens at the optical axis, and R14 is the radius of curvature of the image side surface of the seventh lens at the optical axis. By making the optical system satisfy the above relation, by reasonably matching the ratio between the radius of curvature of the object side surface and the image side surface of the seventh lens at the optical axis, the surface type difference of the seventh lens can be set reasonably, which is beneficial for controlling the shape of the seventh lens, correcting the aberrations generated by itself, and improving the imaging quality.

[0028] In one embodiment, the optical system satisfies the relation: 0.6 ≤ SAG13 / SAG14 ≤ 2.8. By making the optical system satisfy the above relation, the shape of the seventh lens can be well controlled, which is beneficial for the forming and processing of the seventh lens. At the same time, the field curvature generated by each lens on the object side can also be trimmed to ensure the balance of the field curvature of the optical system.

[0029] In one embodiment, the optical system satisfies the relation: 10mm ≤ TTL × IMGH / F ≤ 15mm. By making the optical system satisfy the above relation, it is possible to meet the requirement that the optical system is adapted to a large-sized imaging surface IMG (imaging chip), meet the market demand for miniaturization of the optical system, and enable the optical system to meet the market demands for both a large target surface and miniaturization simultaneously.

[0030] In one embodiment, the optical system satisfies the relation: 0.93 ≤ IMGH / (F × tan(FOV / 2)) ≤ 1.01. By making the optical system satisfy the above relation, it is helpful to better control the optical distortion of the optical system and improve the resolution of the optical system.

[0031] In one embodiment, the optical system satisfies the relation: 2.3deg / mm ≤ FOV / F ≤ 4deg / mm. By making the optical system satisfy the above relation, the field of view angle can be controlled within a reasonable range, so as to make the focal length reach the distance of a long focal length and realize the telephoto function.

[0032] In a second aspect, the present invention further provides an imaging module, which includes a photosensitive chip and the optical system according to any one of the embodiments of the first aspect. The photosensitive chip is disposed on the image side of the optical system. Wherein, the photosensitive surface of the photosensitive 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 photosensitive chip can be a Complementary Metal Oxide Semiconductor (CMOS) or a Charge-coupled Device (CCD). The imaging module can be an imaging module integrated on an electronic device or an independent lens. By adding the optical system provided by the present invention to the imaging module, it is possible to reasonably design the surface shape and refractive power of each lens in the optical system, so that the imaging module has the characteristics of a large aperture, a high relative illumination, and a large field of view angle.

[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 computer, a smart watch, etc. By adding the imaging module provided by the present invention to the electronic device, the electronic device has the characteristics of a large aperture, a high relative illumination, and a large field of view angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] 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 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, without creative efforts, other drawings can also be obtained based on these drawings.

[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 graph, astigmatism curve graph, and distortion curve graph 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 graph, astigmatism curve graph, and distortion curve graph 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 the camera module in an embodiment of the present invention;

[0046] Figure 12 shows a schematic structural diagram of the electronic device in an embodiment of the present invention. Detailed 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention 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 a total of seven lenses with refractive power. Along the optical axis, from the object side to the image side, it sequentially includes: 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 concave 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 is concave near the optical axis, and the image side surface of the seventh lens is convex near the optical axis.

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

[0050] By making the first lens have 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 concave near the optical axis, it is beneficial for the light to enter smoothly, preventing the light from bending too much, effectively reducing the field curvature and astigmatism of the optical system, and reducing the overall sensitivity of the optical system; 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 for initially correcting the astigmatism of the optical system and effectively controlling the trend of light, achieving a larger 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 for collecting and compressing the incident light on the object side, enabling the light to smoothly transition to the optical system on the image side; 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 third lens being convex near the optical axis, it provides a reasonable light incident angle for the introduction of marginal rays; by making the fifth lens have a negative refractive power, with the object side of the third lens being concave near the optical axis and the image side of the third lens being concave near the optical axis, it is beneficial for the marginal rays to enter and be refracted, reducing the refraction angle borne by the subsequent lenses, making the refraction angles of the light on each lens more uniform, and effectively correcting the aberration of the marginal field of view; the fourth lens and the fifth lens are cemented lenses, which is beneficial for correcting chromatic aberration and balancing various aberrations, improving the resolution ability of the optical system, and effectively reducing the tolerance sensitivity, enhancing the imaging quality of the optical system; 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 depressing the light incident angle after the light passes through the aperture stop, enabling more light to enter the optical system on the image side, and increasing the illuminance of the optical system; by making the seventh lens have a positive refractive power or a negative refractive power, with the object side of the seventh lens being concave near the optical axis and the image side of the seventh lens being convex near the optical axis, through specific surface shape matching and reasonable refractive power distribution, it can improve the imaging quality of the optical system, reduce aberrations, and enhance the imaging quality of the optical system.

[0051] By making the optical system satisfy the relation: 1.65 ≤ FNO ≤ 1.75, the aperture number of the optical system is set within a reasonable range, improving the light transmission ability of the optical system, making the relative illuminance of the optical system higher, enabling it to have good imaging quality even in darker environments such as at night or on rainy and cloudy days, and meeting the requirements of a large aperture and high resolution.

[0052] By making the optical system satisfy the relation: 34deg ≤ FOV ≤ 50deg, the maximum field of view angle of the optical system is controlled within a reasonable range, avoiding the introduction of excessive aberrations, and being beneficial for the optical system to meet the characteristics of miniaturization while obtaining sufficient field of view.

[0053] In one embodiment, the optical system satisfies the relationship: 2.2 ≤ TTL / F ≤ 3.1; where TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, and F is the effective focal length of the optical system. Specifically, the value of TTL / F can be 2.235, 2.389, 2.432, 2.585, 2.653, 2.753, 2.886, 3.081, etc. By making the optical system satisfy the above relationship, 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.

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

[0055] In one embodiment, the optical system satisfies the relationship: 6 ≤ TTL / IMGH ≤ 8.5; where IMGH is half of the image height corresponding to the maximum field of view angle of the optical system. Specifically, the value of TTL / IMGH can be 6.062, 6.582, 7.021, 7.258, 7.526, 7.779, 8.025, 8.411, etc. By making the optical system satisfy the above relationship, under the condition of a certain image height of the optical system, by controlling the ratio of the image height to the focal length of the optical system, the optical system is limited to have a smaller overall length to realize the characteristic of miniaturization.

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

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

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

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

[0060] In one embodiment, the optical system satisfies the relationship: -5 ≤ F1 / CT1 ≤ -3; where F1 is the effective focal length of the first lens, and CT1 is the thickness of the first lens on the optical axis. Specifically, the value of F1 / CT1 can be -4.730, -4.522, -4.232, -3.955, -3.546, -3.497, -3.401, -3.359, etc. By making the optical system satisfy the above relationship, it is beneficial to reasonably configure the refractive power and thickness of the first lens, so as to effectively control the incident angle of light in the optical system, reduce the sensitivity of the optical system, facilitate correcting the aberration generated by the optical system, and further facilitate improving the imaging quality of the optical system.

[0061] In one embodiment, the optical system satisfies the relationship: 2.2 ≤ F4 / CT4 ≤ 2.9; where F4 is the effective focal length of the fourth lens, and CT4 is the thickness of the fourth lens on the optical axis. Specifically, the value of F4 / CT4 can be 2.223, 2.306, 2.435, 2.547, 2.696, 2.702, 2.823, 2.873, etc. By making the optical system satisfy the above relationship, it is beneficial to reasonably configure the refractive power and thickness of the fourth lens, so as to effectively control the incident angle of light in the optical system, reduce the sensitivity of the optical system, facilitate correcting the aberration generated by the optical system, and further facilitate improving the imaging quality of the optical system.

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

[0063] In one embodiment, the optical system satisfies the relation: -4.5 ≤ R9 / R10 ≤ -1.5; where R9 is the radius of curvature of the object side of the fifth lens at the optical axis, and R10 is the radius of curvature of the image side of the fifth lens at the optical axis. Specifically, the value of R9 / R10 can be -4.317, -3.852, -3.111, -2.756, -2.384, -2.188, -1.809, -1.623, etc. By making the optical system satisfy the above relation, it is beneficial to rationally configure the ratio of the radius of curvature of the object side of the fifth lens at the optical axis to the radius of curvature of the image side 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.

[0064] In one embodiment, the optical system satisfies the relation: 1.5 ≤ F6 / F ≤ 2.7; where F6 is the effective focal length of the sixth lens. Specifically, the value of F6 / F can be 1.507, 1.578, 1.602, 1.730, 1.923, 2.305, 2.506, 2.632, etc. By making the optical system satisfy the above relation, it is beneficial for the refractive power of the sixth lens in the optical system to be properly matched, the surface type design of the sixth lens to be simpler and more flexible, reduce the aberration, and simplify the aberration correction of the overall optical system and the balance of the imaging quality.

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

[0066] In one embodiment, the optical system satisfies the relation: 3 ≤ |(R5 - R6) / (R5 + R6)| ≤ 150; where R5 is the curvature radius of the object side of the third lens on the optical axis, and R6 is the curvature radius of the image side of the third lens on the optical axis. Specifically, the value of |(R5 - R6) / (R5 + R6)| can be 3.109, 3.297, 5.551, 47.031, 60.248, 85.369, 112.267, 132.029, etc. By making the optical system satisfy the above relation, it is beneficial for the optical system to receive the light diverged from the second lens and smoothly enter the rear; by moderately converging the light in front, the light transition is gentle, reducing the light energy loss, which is beneficial for the initial aberration correction of the incident light and beneficial for achieving high resolution and improving the resolution ability of the optical system.

[0067] In one embodiment, the optical system satisfies the relation: 1.7 ≤ F3 / F ≤ 2; where F3 is the effective focal length of the third lens. Specifically, the value of F3 / F can be 1.716, 1.739, 1.746, 1.753, 1.795, 1.850, 1.902, 1.996, etc. By making the optical system satisfy the above relation and reasonably setting the effective focal length of the third lens, the incident light in front can be effectively collected and compressed, and the light can smoothly transition to the optical system in the rear, reducing the generation of aberrations, thereby improving the imaging quality of the lens.

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

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

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

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

[0072] In one embodiment, the optical system satisfies the relation: 0.93 ≤ IMGH / (F × tan(FOV / 2)) ≤ 1.01. Specifically, the value of IMGH / (F × tan(FOV / 2)) can be 0.939, 0.942, 0.944, 0.954, 0.965, 0.979, 0.986, 1.005, etc. By making the optical system satisfy the above relation, it helps to better control the optical distortion of the optical system and improve the resolution of the optical system.

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

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

[0075] In one embodiment, the optical system satisfies the relationship: 20 ≤ FOV / FNO ≤ 29. Specifically, the value of FOV / FNO can be 20.606, 23.030, 23.529, 24.987, 25.455, 26.789, 28.571, etc. By making the optical system satisfy the above relationship, the ratio of the field of view angle and the aperture number of the optical system is reasonably configured, realizing the combined effect of the optical system having a large field of view angle and a large aperture. 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 relationship: -1.4 ≤ F1 / F ≤ -1.1. Specifically, the value of F1 / F can be -1.359, -1.356, -1.294, -1.256, -1.925, -1.756, -1.165, -1.156, etc. By making the optical system satisfy the above relationship, it is beneficial for the refractive power of the first lens in the optical system to be properly coordinated. The surface type design of the first lens is more simple and flexible, enabling the first lens to support a large field of view angle and a large aperture. At the same time, it is also beneficial to converge the light rays incident on the optical system from the first lens, delay the incident angle of the light rays, reduce aberration, and 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: 1.3 ≤ F2 / F ≤ 1.6; where F2 is the effective focal length of the second lens. Specifically, the value of F2 / F can be 1.323, 1.357, 1.398, 1.425, 1.458, 1.500, 1.501, 1.532, etc. By making the optical system satisfy the above relation, it is beneficial for the refractive power of the second lens to be properly matched in the optical system, the surface shape design of the second lens is more simple and flexible, the aberration is reduced, and the aberration correction of the overall optical system and the balance of imaging quality are simplified.

[0078] In one embodiment, the optical system satisfies the relation: 0.8 ≤ F4 / F ≤ 1. Specifically, the value of F4 / F can be 0.851, 0.865, 0.875, 0.880, 0.925, 0.956, 0.946, 0.974, etc. By making the optical system satisfy the above 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 is more simple and flexible, the aberration is reduced, and the aberration correction of the overall optical system and the balance of imaging quality are simplified.

[0079] In one embodiment, the optical system satisfies the relation: -0.6 ≤ F5 / F ≤ -0.4; where F5 is the effective focal length of the fifth lens. Specifically, the value of F5 / F can be -0.593, -0.571, -0.562, -0.558, -0.525, -0.481, -0.451, -0.425, etc. By making the optical system satisfy the above 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 is more simple and flexible, the aberration is reduced, and the aberration correction of the overall optical system and the balance of imaging quality are simplified.

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

[0081] In one embodiment, the optical system satisfies the relationship: R1 / R2 ≥ -2; 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. Specifically, the value of R1 / R2 can be -1.974, -1.756, -1.259, -0.958, -0.418, -0.211, -0.187, -0.108, etc. By making the optical system satisfy the above relationship, it is beneficial to rationally configure the ratio of the curvature radius of the object side surface of the first lens on the optical axis to the curvature radius of the image side surface of the first lens on the optical axis, control the shape of the first 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, and at the same time, it is also beneficial to reduce the processing difficulty of the first lens.

[0082] In one embodiment, the optical system satisfies the relationship: -0.3 ≤ R3 / R4 ≤ -0.15; R4 is the curvature radius of the image side surface of the second lens on the optical axis. Specifically, the value of R3 / R4 can be -0.280, -0.265, -0.234, -0.217, -0.216, -0.205, -0.188, -0.167, etc. By making the optical system satisfy the above relationship, it is beneficial to rationally configure the ratio of the curvature radius of the object side surface of the second lens on the optical axis to the curvature radius of the image side surface of the second lens on the optical axis, control the shape of the second 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, and at the same time, it is also beneficial to reduce the processing difficulty of the second lens.

[0083] In one embodiment, the optical system satisfies the relationship: -1.1 ≤ R5 / R6 ≤ -0.5. Specifically, the value of R5 / R6 can be -1.015, -0.958, -0.875, -0.725, -0.695, -0.627, -0.535, -0.513, etc. By making the optical system satisfy the above relationship, it is beneficial to rationally configure the ratio of the curvature radius of the object side surface of the third lens on the optical axis to the curvature radius of the image side surface of the third lens on the optical axis, control the shape of the third 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, and at the same time, it is also beneficial to reduce the processing difficulty of the third lens.

[0084] In one embodiment, the optical system satisfies the relation: -0.8 ≤ R7 / R8 ≤ -0.4; where R7 is the radius of curvature of the object side surface of the fourth lens at the optical axis, and R8 is the radius of curvature of the image side surface of the fourth lens at the optical axis. Specifically, the value of R7 / R8 can be -0.780, -0.702, -0.644, -0.625, -0.571, -0.559, -0.498, -0.414, etc. By 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.

[0085] In one embodiment, the optical system satisfies the relation: 0.2 ≤ R11 / R12 ≤ 0.9; where R11 is the radius of curvature of the object side surface of the sixth lens at the optical axis, and R12 is the radius of curvature of the image side surface of the sixth lens at the optical axis. Specifically, the value of R11 / R12 can be 0.231, 0.323, 0.398, 0.459, 0.568, 0.758, 0.859, 0.863, etc. By 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 relation: 0.2 ≤ R13 / R14 ≤ 1.8. Specifically, the value of R13 / R14 can be 0.203, 0.310, 0.383, 0.568, 0.758, 1.082, 1.458, 1.731, etc. By 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 seventh lens at the optical axis to the radius of curvature of the image side surface 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, 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 seventh lens.

[0087] 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 a part of infrared light with high transmittance, so as to realize different wavelength band selections, and can realize both visible light imaging and infrared imaging, so as to realize day and night universality. The filter can be assembled together with each lens as 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 made of colored glass, or a filter of other materials, which can be selected according to actual needs and is not specifically limited in this embodiment. In some other embodiments, the function of filtering light can also be realized by setting a filter coating on at least one of the first lens to the fifth lens.

[0088] 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 surface or image side surface) of the lens is aspherical, the lens can be said to have an aspherical surface type. In some embodiments, the object side surface and the image side surface of each lens can also be designed as aspherical surfaces. The aspherical design can help the optical system more effectively eliminate aberrations 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 composed of 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.

[0089] 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 set 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.

[0090] The first embodiment

[0091] Please refer to Figure 1 , the optical system 10 of this embodiment sequentially includes, from the object side to the image side along the optical axis direction:

[0092] 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 concave near the optical axis.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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.

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

[0099] 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, and includes an object side S15 and an image side S16. The infrared filter IR is an infrared cut-off filter, and the infrared cut-off filter is used to filter out infrared light so that the light incident on the imaging surface IMG is visible light, and the wavelength of the visible light is 380 nm - 780 nm. The material of the infrared cut-off filter can be glass (GLASS) or plastic (Plastic), and a film can be coated on its surface. The protective glass CG is disposed between the infrared filter IR and the imaging surface IMG, and includes an object side S17 and an image side S18. The materials of the first lens L1 to the sixth lens L7 can be glass (GLASS) or plastic (Plastic). The effective pixel area of the photosensitive chip is located on the imaging surface, and an infrared light photosensitive chip is disposed at the imaging surface IMG. The photosensitive chip captures different band information of the object for subsequent processing.

[0100] 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 555 nm. The units of the Y radius, thickness, and effective focal length are all millimeters (mm).

[0101] Table 1a

[0102]

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

[0104] In this embodiment, 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 aspherical surface profile x can be defined by, but not limited to, the following aspherical formula:

[0105]

[0106] Wherein, 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 coefficient corresponding to the i-th high-order term in the aspherical surface formula. Table 1b gives the high-order term coefficients A4, A6, A8, A10, A12, A14, and A16 of the aspherical mirrors S3, S4, S13, and S14 that can be used in the first embodiment.

[0107] Table 1b

[0108]

[0109] 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 focal 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 converging focal points of light rays of different wavelengths after passing through each lens of the optical system 10. From Figure 2 As can be seen from Figure (a), the deviation degrees of the converging focal points of 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.

[0110] 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 focal 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. From 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.

[0111] 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. From Figure 2 As can be seen from Figure (c), at a wavelength of 555.0000 nm, the image deformation caused by the principal beam is small, and the imaging quality of the system is excellent.

[0112] From Figure 2 in (a), Figure 2 in (b), and Figure 2 in (c), it can be seen that the aberration of the optical system 10 of this embodiment is small, the imaging quality is good, and it has good imaging quality.

[0113] Second Embodiment

[0114] 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:

[0115] 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 concave near the optical axis.

[0116] 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.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] 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.

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

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

[0124] Table 2a

[0125]

[0126] Table 2b gives the coefficients of the 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.

[0127] Table 2b

[0128]

[0129]

[0130] Figure 4 In (a), Figure 4 In (b), Figure 4 In (c), the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system 10 of the second embodiment are respectively shown. 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 4 the aberration diagram in it, 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.

[0131] Third Embodiment

[0132] 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:

[0133] 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 concave near the optical axis.

[0134] 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.

[0135] 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.

[0136] 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.

[0137] 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.

[0138] 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.

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

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

[0141] Table 3a shows the various parameters of the optical system 10 of this embodiment, and the meanings of the various parameters are the same as those of the first embodiment.

[0142] Table 3a

[0143]

[0144]

[0145] Table 3b gives the higher-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.

[0146] Table 3b

[0147]

[0148] 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 converging focal points of the 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 in it, 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.

[0149] Fourth Embodiment

[0150] 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:

[0151] 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 concave near the optical axis.

[0152] 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.

[0153] 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.

[0154] 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.

[0155] 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.

[0156] 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.

[0157] 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.

[0158] The other structures of the fourth embodiment are the same as those of the first embodiment, and can be referred to.

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

[0160] Table 4a

[0161]

[0162] Table 4b gives the higher-order term coefficients of the aspherical mirror surfaces that can be used in the fourth embodiment. Among them, the aspherical surface types can be defined by the formulas given in the first embodiment.

[0163] Table 4b

[0164]

[0165] Figure 8 In (a), Figure 8 In (b), Figure 8 In (c), the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system 10 of the fourth 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 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 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.

[0166] The fifth embodiment

[0167] 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:

[0168] 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 concave near the optical axis.

[0169] 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.

[0170] 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.

[0171] 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.

[0172] 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.

[0173] 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.

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

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

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

[0177] Table 5a

[0178]

[0179]

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

[0181] Table 5b

[0182]

[0183] Figure 10in (a), Figure 10 in (b), Figure 10 and in (c) respectively show the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system 10 of the fifth 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 10 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.

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

[0185] Table 6

[0186]

[0187]

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

[0189] Please refer to Figure 11, the present invention also provides an imaging module 20, which includes a photosensitive chip 21 and the optical system 10 described in any of the above embodiments. The photosensitive chip 21 is disposed on the image side of the optical system 10. Among them, the photosensitive surface of the photosensitive 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 photosensitive 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 a large aperture, a high relative illumination, and a large field of view.

[0190] 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 a large aperture, a high relative illumination, and a large field of view.

[0191] 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 seven lenses with refractive power, including: A first lens has negative refractive power, an object side surface of the first lens is concave at the near optical axis, and an image side surface of the first lens is concave at the near optical axis; A second lens having positive refractive power, an object side surface of the second lens being convex at the near optical axis, and an image side surface of the second lens being convex at the near optical axis; A third lens having positive refractive power, wherein the object side surface of the third lens is convex at the near optical axis, and the image side surface of the third lens is convex at the near optical axis; a fourth lens having positive refractive power, wherein the object side surface of the fourth lens is convex at the near optical axis, and the image side surface of the fourth lens is convex at the near optical axis; a fifth lens element having negative refractive power, wherein the object side surface of the fifth lens element is concave at the near optical axis, and the image side surface of the fifth lens element is concave at the near optical axis; a sixth lens having positive refractive power, wherein the object side surface of the sixth lens is convex at the near optical axis, and the image side surface of the sixth lens is concave at the near optical axis; a seventh lens having refractive power, wherein the object side surface of the seventh lens is concave at the near optical axis, and the image side surface of the seventh lens is convex at the near optical axis; The optical system satisfies the relationship: 1.65≤FNO≤1.75, 34deg≤FOV≤50deg; Wherein, FNO is the aperture number of the optical system, and FOV is the maximum field of view of the optical system.

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

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

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

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

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

7. The optical system according to claim 1, wherein: The optical system satisfies the relationship: -2.5≤(SAG13+SAG14) / CT7≤-1; and / or, 0.5≤R14 / R13≤5; and / or, 0.6≤SAG13 / SAG14≤2.8; Among them, SAG13 is the sag height at the maximum effective aperture of the object side surface of the seventh lens, SAG14 is the sag height at the maximum effective aperture of the image side surface of the seventh lens, CT7 is the thickness of the seventh lens on the optical axis, R13 is the curvature radius of the object side surface of the seventh lens at the optical axis, and R14 is the curvature radius of the image side surface of the seventh lens at the optical axis.

8. The optical system according to claim 1, wherein: The optical system satisfies the relationship: 10mm≤TTL×IMGH / F≤15mm; and / or, 0.93≤IMGH / (F×tan(FOV / 2))≤1.01; and / or, 2.3deg / mm≤FOV / F≤4deg / mm; Wherein, TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, IMGH is half of the image height corresponding to the maximum field angle of the optical system, and F is the effective focal length of the optical system.

9. A camera module, characterized in that: The optical system comprises the optical system and a photosensitive chip as described in any one of claims 1 to 8, wherein the photosensitive chip is located on the image side of the optical system.

10. An electronic device, characterized in that: The electronic device includes a housing and the camera module according to claim 9, and the camera module is arranged in the housing.

Images