Optical System, Camera Module, and Electronic Device

Abstract

An optical system, a camera module, and an electronic device. The optical system sequentially includes, from the object side to the image side along the optical axis: a first lens to a sixth lens having refractive power, wherein the first lens, the fourth lens, and the sixth lens have negative refractive power, and the second lens, the third lens, and the fifth lens have positive refractive power. Among them, the object side surface of the first lens, the object side surface and the image side surface of the fourth lens, and the object side surface of the sixth lens are concave surfaces near the optical axis, and the image side surface of the first lens, the object side surface and the image side surface of the second lens, the object side surface and the image side surface of the third lens, and the object side surface and the image side surface of the fifth lens are convex surfaces near the optical axis. By reasonably designing the surface types and refractive powers of the lenses of the optical system, it is beneficial to meet the characteristics of miniaturization, high pixel count, and a relatively large field of view.

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] Thanks to the rapid development of automotive assisted driving systems in recent years, optical lenses have been widely used in automobiles. Among them, optical lenses can be widely used in in-vehicle reverse vision systems, dash cams, automatic parking and panoramic parking systems, road navigation systems, etc.

[0003] In-vehicle lenses are key components for autonomous driving assistance systems to obtain external information. Due to safety considerations, the performance requirements for in-vehicle lenses are very strict. First of all, in-vehicle lenses need to have a clearer and wider field of view to fully collect environmental information and ensure driving safety; moreover, in-vehicle lenses need to be able to capture both relatively close and relatively far objects and be able to form clear images of them; in addition, in-vehicle lenses should also meet the requirement of being thinner and lighter.

[0004] Therefore, an optical lens with miniaturization, high pixel count, and a large field of view is needed to meet the requirements of autonomous driving applications. Summary of the Invention

[0005] The object 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 be miniaturized, have a high pixel count, and a large field of view.

[0006] To achieve the object of the present invention, the present invention provides the following technical solutions:

[0007] In a first aspect, the present invention provides an optical system, which has six refractive lenses. Along the optical axis from the object side to the image side, it successively includes: a first lens, having negative refractive power, the object side surface of the first lens is concave near the optical axis, and the image side surface of the first lens is convex near the optical axis; a second lens, having 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, having 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, having negative refractive power, the object side surface of the fourth lens is concave near the optical axis, and the image side surface of the fourth lens is concave near the optical axis; a fifth lens, having positive refractive power, the object side surface of the fifth lens is convex near the optical axis, and the image side surface of the fifth lens is convex near the optical axis; a sixth lens, having negative refractive power, the object side surface of the sixth lens is concave near the optical axis.

[0008] The optical system satisfies the relationship: 32deg ≤ FOV ≤ 45deg, 2 ≤ TTL / F ≤ 2.71; where FOV is the maximum field of view angle of the optical system, TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, and F is the effective focal length of the optical system.

[0009] By making the first lens have a negative refractive power, with the object side surface of the first lens being concave near the optical axis and the image side surface of the first lens being convex near the optical axis, it is beneficial for the light to enter gently, preventing the light from being bent 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 surface of the second lens being convex near the optical axis and the image side surface 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 light path to achieve a larger aperture; by making the third lens have a positive refractive power, with the object side surface of the third lens being convex near the optical axis and the image side surface of the third lens being convex near the optical axis, it is beneficial for enhancing the positive refractive power of the third lens and further providing a reasonable light incident angle for the introduction of marginal light; by making the fourth lens have a negative refractive power, with the object side surface of the fourth lens being concave near the optical axis and the image side surface of the fourth lens being concave near the optical axis, it is beneficial for the marginal light to enter and be deflected, reducing the deflection angle borne by the subsequent lenses, making the deflection angles of the light on each lens more uniform, and effectively correcting the aberration of the marginal field of view; the third lens and the fourth 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 and enhancing the imaging quality of the optical system; by making the fifth lens have a positive refractive power, with the object side surface of the fifth lens being convex near the optical axis and the image side surface of the fifth lens being convex near the optical axis, it is beneficial for effectively collecting and compressing the incident light on the object side of the fifth lens, enabling the light to smoothly transition to the optical system on the image side of the fifth lens; by making the sixth lens have a negative refractive power, with the object side surface 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, allowing more light to enter the optical system on the image side and increasing the illuminance of the optical system.

[0010] By making the optical system satisfy the relationship: 32deg ≤ FOV ≤ 45deg, 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 a sufficient field of view.

[0011] By making the optical system satisfy the relationship: 2 ≤ TTL / F ≤ 2.71, the ratio of the total length to the effective focal length of the optical system is reasonably configured, which is beneficial for restricting the total length of the optical system and achieving the miniaturization of the optical system.

[0012] In one embodiment, the optical system satisfies the relation: 5.9 ≤ TTL / IMGH ≤ 7.9; 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, the ratio of the total length to the image height of the optical system is reasonably configured. In combination with the above range of the maximum field of view angle of the optical system, it is beneficial to limit the total length of the optical system and achieve miniaturization of the optical system.

[0013] In one embodiment, the optical system satisfies the relation: 20deg ≤ FOV / FNO ≤ 27deg; where FNO is the f-number of the optical system. By making the optical system satisfy the above relation, the ratio of the field of view angle to the f-number of the optical system is reasonably configured, achieving the combined effect of a larger field of view angle and a large aperture for the optical system. The optical system has a reasonable light input amount, can improve the problem that the relative brightness of the edge field of view drops rapidly, enhance the overall illuminance of the imaging picture, and is also beneficial to obtaining more scene information.

[0014] In one embodiment, the optical system satisfies the relation: 2.6 ≤ F / IMGH ≤ 3.4; where F is the effective focal length of the optical system. By making the optical system satisfy the above relation, the ratio of the effective focal length to the image height of the optical system is reasonably configured, which is beneficial to improving the imaging quality of the optical system.

[0015] In one embodiment, the optical system satisfies the relation: 0.59 ≤ ∑CT / TTL ≤ 0.66; where ∑CT is the sum of the thicknesses of the first lens to the sixth lens on the optical axis. By making the optical system satisfy the above relation, the ratio of the sum of the thicknesses of the first lens to the sixth lens on the optical axis to the image height of the optical system is reasonably configured, which is beneficial to compressing the total length and volume of the optical system and achieving miniaturization of the optical system.

[0016] In one embodiment, the optical system satisfies the relation: 6 ≤ TTL / CTMAX ≤ 7.4; where CTMAX is the maximum value of the thicknesses of the first lens to the sixth lens on the optical axis. By making the optical system satisfy the above relation, the ratio of the image height of the optical system to the maximum value of the thicknesses of the first lens to the sixth lens on the optical axis is reasonably configured. It can be understood that the first lens to the sixth lens all have a certain thickness on the optical axis, and CTMAX is the maximum value of this thickness among the six lenses, so that the ratio of the total length of the optical system to the maximum value of the thicknesses of the first lens to the sixth lens on the optical axis is reasonably configured, which is beneficial to reasonably setting the thicknesses of the lenses in the optical system. The thicknesses of the lenses in the optical system and the spacing distances between adjacent two lenses can be adjusted to each other, reducing the aberration and tolerance sensitivity of the optical system and enhancing the imaging quality of the optical system.

[0017] In one embodiment, the optical system satisfies the relation: 2 ≤ ∑CT / ∑AT ≤ 2.95; where ∑AT is the sum of the axial distances between adjacent lenses. By making the optical system satisfy the above relation, the ratio of the sum of the thicknesses of the first lens to the sixth lens on the optical axis to the sum of the axial distances between adjacent lenses is reasonably configured, so that the thicknesses of the lenses in the optical system and the axial distances between adjacent lenses are reasonably set, realizing the miniaturization of the optical system, improving the processability of the optical system, and facilitating the mutual adjustment of the thicknesses of the lenses in the optical system and the mutual adjustment of the axial distances between adjacent lenses, reducing the aberration and tolerance sensitivity of the optical system, and improving the imaging quality of the optical system.

[0018] In one embodiment, the optical system satisfies the relation: 1.02 ≤ SD3 / SD2 ≤ 1.16; where SD3 is half of the maximum effective aperture of the object side of the second lens, and SD2 is half of the maximum effective aperture of the image side of the first lens. By making the optical system satisfy the above relation, the ratio of half of the maximum effective aperture of the object side of the second lens to half of the maximum effective aperture of the image side of the first lens is reasonably configured, and the size transition from the first lens to the second lens is smoother, which is beneficial to reducing the aberration of the optical system and ensuring the imaging quality.

[0019] In one embodiment, the optical system satisfies the relation: 1.05 ≤ SD1 / SD12 ≤ 1.35; where SD1 is half of the maximum effective aperture of the object side of the first lens, and SD12 is half of the maximum effective aperture of the image side of the sixth lens. By making the optical system satisfy the above relation, the ratio of half of the maximum effective aperture of the object side of the first lens to half of the maximum effective aperture of the image side of the sixth lens is reasonably configured, which is beneficial to reasonably restricting the front aperture and the rear aperture of the optical system and realizing the miniaturization of the optical system.

[0020] In one embodiment, the optical system satisfies the relation: 1.05 ≤ SD3 / CT2 ≤ 1.45; where CT2 is the thickness of the second lens on the optical axis. By making the optical system satisfy the above relation, the ratio of half of the maximum effective aperture of the object side of the second lens to the thickness of the second lens on the optical axis is reasonably configured, which is beneficial to the second lens having a suitable aperture to realize the miniaturization of the optical system, and makes the thickness ratio of the second lens more reasonable, simplifying the production and manufacturing of the second lens.

[0021] In one embodiment, the optical system satisfies the relation: -2.2 ≤ F1 / F ≤ -1.3; where F1 is the effective focal length of the first lens. By making the optical system satisfy the above relation, the ratio of the effective focal length of the first lens to the effective focal length of the optical system is reasonably configured, which is beneficial to diverging light. Under the condition of the same field of view angle, the light rays emerging from the image side of the first lens can enable the subsequent optical system to have a larger light receiving surface, and reduce the front aperture of the optical system.

[0022] In one embodiment, the optical system satisfies the relation: 0.85 ≤ F2 / F ≤ 1.2; where F2 is the effective focal length of the second lens. By making the optical system satisfy the above relation, the ratio of the effective focal length of the second lens to the effective focal length of the optical system is reasonably configured, which is beneficial to the second lens in converging light, reducing the rear aperture of the optical system subsequent to the second lens, and when the second lens is paired with the first lens having a negative refractive power, it is also beneficial to reducing the total length of the optical system and realizing the miniaturization of the optical system.

[0023] In one embodiment, the optical system satisfies the relation: 0.65 ≤ F3 / F ≤ 0.7; where F3 is the effective focal length of the third lens. By making the optical system satisfy the above relation, the ratio of the effective focal length of the third lens to the effective focal length of the optical system is reasonably configured, which is beneficial for the third lens to have an appropriate positive optical power, effectively optimizing spherical aberration and achieving high-quality imaging of the optical system.

[0024] In one embodiment, the optical system satisfies the relation: 0.22 ≤ BFL / F ≤ 0.3; where BFL is the distance from the image side of the sixth lens to the imaging plane on the optical axis. By making the optical system satisfy the above relation, the ratio of the distance from the image side of the sixth lens to the imaging plane on the optical axis to the effective focal length of the optical system is reasonably configured, which is beneficial for reasonably setting the optical back focal length of the optical system, enabling the light rays to transition to the imaging plane more smoothly, and improving the resolution ability of the optical system.

[0025] In one embodiment, the optical system satisfies the relation: -1.5 ≤ F1 / F12 ≤ -0.8; where F12 is the combined effective focal length of the first lens and the second lens. By making the optical system satisfy the above relation, the ratio of the effective focal length of the first lens to the combined effective focal length of the first lens and the second lens is reasonably configured, which is beneficial for balancing the refractive power distribution between the first lens and the second lens, enabling the aberrations generated by the first lens and the second lens to correct each other, and improving the imaging quality of the optical system.

[0026] In one embodiment, the optical system satisfies the relation: -2.5 ≤ F5 / F4 ≤ -1.8; where F5 is the effective focal length of the fifth lens, and F4 is the effective focal length of the fourth lens. By making the optical system satisfy the above relation, the ratio of the effective focal length of the fifth lens to the effective focal length of the fourth lens is reasonably configured, which is beneficial to balancing the refractive power distribution between the fourth lens and the fifth lens, enabling the aberrations generated by the fourth lens and the fifth lens to correct each other, and improving the imaging quality of the optical system.

[0027] In one embodiment, the optical system satisfies the relation: 0.25 ≤ SAG3 / CT2 ≤ 0.4; where SAG3 is the sagitta at the maximum effective aperture of the object side of the second lens, that is, the distance from the intersection of the object side of the second lens and the optical axis to the maximum effective aperture of the object side of the second lens in the direction parallel to the optical axis, and CT2 is the thickness of the second lens on the optical axis. By making the optical system satisfy the above relation, the ratio of the sagitta at the maximum effective aperture of the object side of the second lens to the thickness of the second lens on the optical axis is reasonably configured, which is beneficial to reasonably controlling the refractive power and thickness of the second lens at various positions perpendicular to the optical axis, avoiding the second lens being too thick or too thin, reducing the incident angle of light on the object side of the second lens, and reducing the tolerance sensitivity of the optical system.

[0028] In one embodiment, the optical system satisfies the relation: 0.65 ≤ CT4 / CT3 ≤ 1.4; where CT4 is the thickness of the fourth lens on the optical axis, and CT3 is the thickness of the third lens on the optical axis. By making the optical system satisfy the above relation, the ratio of the thickness of the fourth lens on the optical axis to the thickness of the third lens on the optical axis is reasonably configured, and the third lens and the fourth lens can regulate each other to maintain the miniaturization characteristics of the optical system.

[0029] In one embodiment, the optical system satisfies the relation: 0.9 ≤ AT23 / CT3 ≤ 1.45; where AT23 is the distance on the optical axis from the image side of the second lens to the object side of the third lens. By making the optical system satisfy the above relation, the ratio of the spacing distance between the second lens and the third lens to the thickness of the third lens on the optical axis is reasonably configured, which is beneficial to regulating the positional relationship between the second lens and the third lens, enabling the spacing distance between the second lens and the third lens to be reasonably set, improving the processability of the optical system, and using this spacing distance to reduce aberrations and tolerance sensitivity.

[0030] In one embodiment, the optical system satisfies the relation: 3.2 ≤ F5 / CT5 ≤ 8.1; where CT5 is the thickness of the fifth lens on the optical axis. By making the optical system satisfy the above relation, the ratio of the effective focal length of the fifth lens to the thickness of the fifth lens on the optical axis is reasonably configured, which is beneficial to simplifying the surface shape setting of the fifth lens.

[0031] In one embodiment, the optical system satisfies the relation: -20 ≤ F6 / CT6 ≤ -12; where F6 is the effective focal length of the sixth lens, and CT6 is the thickness of the sixth lens on the optical axis. By making the optical system satisfy the above relation, the ratio of the effective focal length of the sixth lens to the thickness of the sixth lens on the optical axis is reasonably configured, which is beneficial to simplifying the surface type setting of the sixth lens.

[0032] In one embodiment, the optical system satisfies the relation: 25 ≤ 180°×TTL / IMGH / FOV ≤ 40. By making the optical system satisfy the above relation, the total length, image height and field of view angle of the optical system are balanced with each other, which is beneficial to achieving a balance among miniaturization, long focal length and large image plane of the optical system, and improving the imaging quality of the optical system.

[0033] In one embodiment, the optical system satisfies the relation: -1.5 ≤ R5 / R6 ≤ -1.1; where R5 is the curvature radius of the object side surface of the third lens on the optical axis, and R6 is the curvature radius of the image side surface of the third lens on the optical axis. By making the optical system satisfy the above relation, it is beneficial to reasonably 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.

[0034] In one embodiment, the optical system satisfies the relation: -1.2 ≤ R7 / R8 ≤ -0.8; where R7 is the curvature radius of the object side surface of the fourth lens on the optical axis, and R8 is the curvature radius of the image side surface of the fourth 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 fourth lens on the optical axis to the curvature radius of the image side surface of the fourth lens on the optical axis, control the shape of the fourth 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 fourth lens.

[0035] 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, and 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 rationally design the surface shape and refractive power of each lens in the optical system, so that the imaging module has the characteristics of miniaturization, high pixel and large field of view.

[0036] Third aspect, the present invention further provides an electronic device, which includes a housing and the imaging module according to the second aspect, and 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 miniaturization, high pixel and large field of view. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0038] Figure 1 It is a schematic structural diagram of the optical system of the first embodiment;

[0039] Figure 2 It shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the first embodiment;

[0040] Figure 3 It is a schematic structural diagram of the optical system of the second embodiment;

[0041] Figure 4 It shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the second embodiment;

[0042] Figure 5 It is a schematic structural diagram of the optical system of the third embodiment;

[0043] Figure 6 Shows the longitudinal spherical aberration curve graph, astigmatism curve graph, and distortion curve graph of the optical system of the third embodiment;

[0044] Figure 7 Is a schematic structural diagram of the optical system of the fourth embodiment;

[0045] Figure 8 Shows the longitudinal spherical aberration curve graph, astigmatism curve graph, and distortion curve graph of the optical system of the fourth embodiment;

[0046] Figure 9 Is a schematic structural diagram of the optical system of the fifth embodiment;

[0047] Figure 10 Shows the longitudinal spherical aberration curve graph, astigmatism curve graph, and distortion curve graph of the optical system of the fifth embodiment;

[0048] Figure 11 Shows a schematic structural diagram of the camera module in an embodiment of the present invention;

[0049] Figure 12 Shows a schematic structural diagram of the electronic device in an embodiment of the present invention. Detailed implementation manners

[0050] 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 the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0051] In a first aspect, the present invention provides an optical system, which has six lenses with refractive power, and successively includes from the object side to the image side along the optical axis: a first lens, having negative refractive power, the object side surface of the first lens is concave near the optical axis, and the image side surface of the first lens is convex near the optical axis; a second lens, having 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, having 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, having negative refractive power, the object side surface of the fourth lens is concave near the optical axis, and the image side surface of the fourth lens is concave near the optical axis; a fifth lens, having positive refractive power, the object side surface of the fifth lens is convex near the optical axis, and the image side surface of the fifth lens is convex near the optical axis; a sixth lens, having negative refractive power, the object side surface of the sixth lens is concave near the optical axis, and the image side surface of the sixth lens can be convex, concave or flat near the optical axis.

[0052] The optical system satisfies the relationships: 32deg ≤ FOV ≤ 45deg, 2 ≤ TTL / F ≤ 2.71; where FOV is the maximum field of view angle of the optical system, TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, and F is the effective focal length of the optical system. Specifically, the value of FOV can be 34deg, 40deg, 44deg, 38deg, 32deg, 45deg, 36deg, 41deg, 43deg, etc. Specifically, the value of TTL / F can be 2.252, 2.704, 2.609, 2.013, 2.348, 2.051, 2.457, 2.502, etc.

[0053] By making the first lens have a negative refractive power, and the object side surface of the first lens is concave near the optical axis and the image side surface of the first lens is convex near the optical axis, it is beneficial for the light to enter gently, so that the light will not be bent 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, and 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, it is beneficial for initially correcting the astigmatism of the optical system and effectively controlling the trend of light to achieve a larger aperture; by making the third lens have a positive refractive power, and 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, it is beneficial for enhancing the positive refractive power of the third lens and further providing a reasonable light incident angle for the introduction of marginal light; by making the fourth lens have a negative refractive power, and the object side surface of the fourth lens is concave near the optical axis and the image side surface of the fourth lens is concave near the optical axis, it is beneficial for the marginal light to enter and be deflected, which can reduce the deflection angle borne by the subsequent lenses, making the deflection angles of the light on each lens more uniform and effectively correcting the aberration of the marginal field of view; the third lens and the fourth lens are cemented lenses, which is beneficial for correcting chromatic aberration and balancing various aberrations, improving the resolution ability of the optical system, and being able to effectively reduce the tolerance sensitivity and enhance the imaging quality of the optical system; by making the fifth lens have a positive refractive power, and the object side surface of the fifth lens is convex near the optical axis and the image side surface of the fifth lens is convex near the optical axis, it is beneficial for effectively collecting and compressing the incident light on the object side of the fifth lens, making the light smoothly transition to the optical system on the image side of the fifth lens; by making the sixth lens have a negative refractive power, and the object side surface of the sixth lens is concave near the optical axis and the image side surface of the sixth lens is convex, concave or flat near the optical axis, it is beneficial for depressing the light incident angle after the light passes through the aperture stop, so that more light enters the optical system on the image side and improves the illuminance of the optical system.

[0054] By making the optical system satisfy the relation: 32deg ≤ FOV ≤ 45deg, the maximum field of view angle of the optical system is controlled within a reasonable range, which can avoid introducing excessive aberrations and is conducive to the optical system meeting the characteristics of miniaturization while obtaining sufficient field of view.

[0055] By making the optical system satisfy the relation: 2 ≤ TTL / F ≤ 2.71, the ratio of the total length to the effective focal length of the optical system is reasonably configured, which is conducive to restricting the total length of the optical system and realizing the miniaturization of the optical system.

[0056] In one embodiment, the optical system satisfies the relation: 5.9 ≤ TTL / IMGH ≤ 7.9; 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 7.511, 7.872, 6.831, 5.976, 7.045, 5.903, 6.381, 6.517, etc. By making the optical system satisfy the above relation, the ratio of the total length to the image height of the optical system is reasonably configured, and combined with the above range of the maximum field of view angle of the optical system, it is conducive to restricting the total length of the optical system and realizing the miniaturization of the optical system.

[0057] In one embodiment, the optical system satisfies the relation: 20deg ≤ FOV / FNO ≤ 27deg; where FNO is the f-number of the optical system. Specifically, the value of FOV / FNO can be 20.600deg, 23.984deg, 26.190deg, 23.043deg, 22.611deg, 20.323deg, 26.945deg, 24.336deg, etc. By making the optical system satisfy the above relation, the ratio of the field of view angle to the f-number of the optical system is reasonably configured, realizing the combined effect of a larger field of view angle and a large aperture for the optical system. The optical system has a reasonable light input amount, can improve the problem that the relative brightness of the edge field of view drops rapidly, enhance the overall illuminance of the imaging picture, and is also conducive to obtaining more scene information.

[0058] In one embodiment, the optical system satisfies the relation: 2.6 ≤ F / IMGH ≤ 3.4; where F is the effective focal length of the optical system. Specifically, the value of F / IMGH can be 3.336, 2.912, 2.618, 2.969, 3.001, 2.723, 2.863, 3.295, etc. By making the optical system satisfy the above relation, the ratio of the effective focal length to the image height of the optical system is reasonably configured, which is conducive to improving the imaging quality of the optical system.

[0059] In one embodiment, the optical system satisfies the relation: 0.59 ≤ ∑CT / TTL ≤ 0.66; where ∑CT is the sum of the thicknesses of the first lens to the sixth lens on the optical axis. Specifically, the value of ∑CT / TTL can be 0.601, 0.597, 0.652, 0.616, 0.636, 0.642, 0.591, 0.604, etc. By making the optical system satisfy the above relation, the ratio of the sum of the thicknesses of the first lens to the sixth lens on the optical axis to the image height of the optical system is reasonably configured, which is beneficial to compressing the total length and volume of the optical system and realizing the miniaturization of the optical system.

[0060] In one embodiment, the optical system satisfies the relation: 6 ≤ TTL / CTMAX ≤ 7.4; where CTMAX is the maximum value of the thicknesses of the first lens to the sixth lens on the optical axis. Specifically, the value of TTL / CTMAX can be 7.023, 7.386, 6.544, 6.508, 6.113, 6.062, 6.362, 6.812, etc. By making the optical system satisfy the above relation, the ratio of the image height of the optical system to the maximum value of the thicknesses of the first lens to the sixth lens on the optical axis is reasonably configured. It can be understood that the first lens to the sixth lens all have a certain thickness on the optical axis, and CTMAX is the maximum value of this thickness among the six lenses, so that the ratio of the total length of the optical system to the maximum value of the thicknesses of the first lens to the sixth lens on the optical axis is reasonably configured, which is beneficial to the reasonable setting of the thicknesses of the respective lenses in the optical system. The thicknesses of the respective lenses in the optical system and the spacing distances between adjacent two lenses can be adjusted mutually, reducing the aberration and tolerance sensitivity of the optical system and improving the imaging quality of the optical system.

[0061] In one embodiment, the optical system satisfies the relation: 2 ≤ ∑CT / ∑AT ≤ 2.95; where ∑AT is the sum of the spacing distances between adjacent two lenses on the optical axis. Specifically, the value of ∑CT / ∑AT can be 2.019, 2.005, 2.026, 2.922, 2.257, 2.652, 2.463, 2.877, etc. By making the optical system satisfy the above relation, the ratio of the sum of the thicknesses of the first lens to the sixth lens on the optical axis to the sum of the spacing distances between adjacent two lenses on the optical axis is reasonably configured, so that the thicknesses of the respective lenses in the optical system and the spacing distances between adjacent two lenses are all reasonably set, realizing the miniaturization of the optical system and improving the manufacturability of the optical system. It is also beneficial to the mutual adjustment of the thicknesses of the respective lenses in the optical system and the mutual adjustment of the spacing distances between adjacent two lenses, reducing the aberration and tolerance sensitivity of the optical system and improving the imaging quality of the optical system.

[0062] In one embodiment, the optical system satisfies the relation: 1.02 ≤ SD3 / SD2 ≤ 1.16; where SD3 is half of the maximum effective aperture of the object side of the second lens, and SD2 is half of the maximum effective aperture of the image side of the first lens. Specifically, the value of SD3 / SD2 can be 1.093, 1.150, 1.040, 1.072, 1.109, 1.036, 1.069, 1.027, etc. By making the optical system satisfy the above relation, the ratio of half of the maximum effective aperture of the object side of the second lens to half of the maximum effective aperture of the image side of the first lens is reasonably configured, and the size transition from the first lens to the second lens is smoother, which is beneficial to reducing the aberration of the optical system and ensuring the imaging quality.

[0063] In one embodiment, the optical system satisfies the relation: 1.05 ≤ SD1 / SD12 ≤ 1.35; where SD1 is half of the maximum effective aperture of the object side of the first lens, and SD12 is half of the maximum effective aperture of the image side of the sixth lens. Specifically, the value of SD1 / SD12 can be 1.319, 1.169, 1.314, 1.091, 1.300, 1.056, 1.223, 1.274, etc. By making the optical system satisfy the above relation, the ratio of half of the maximum effective aperture of the object side of the first lens to half of the maximum effective aperture of the image side of the sixth lens is reasonably configured, which is beneficial to reasonably restricting the front aperture and the rear aperture of the optical system and realizing the miniaturization of the optical system.

[0064] In one embodiment, the optical system satisfies the relation: 1.05 ≤ SD3 / CT2 ≤ 1.45; where CT2 is the thickness of the second lens on the optical axis. Specifically, the value of SD3 / CT2 can be 1.443, 1.188, 1.118, 1.349, 1.094, 1.061, 1.211, 1.287, etc. By making the optical system satisfy the above relation, the ratio of half of the maximum effective aperture of the object side of the second lens to the thickness of the second lens on the optical axis is reasonably configured, which is beneficial for the second lens to have a suitable aperture to realize the miniaturization of the optical system, and makes the aspect ratio of the second lens more reasonable, simplifying the production and manufacturing of the second lens.

[0065] In one embodiment, the optical system satisfies the relation: -2.2 ≤ F1 / F ≤ -1.3; where F1 is the effective focal length of the first lens. Specifically, the value of F1 / F can be -2.158, -1.660, -2.062, -1.368, -1.824, -1.462, -1.728, -1.905, etc. By making the optical system satisfy the above relation, the ratio of the effective focal length of the first lens to the effective focal length of the optical system is reasonably configured, which is beneficial to diverging light. Under the condition of the same field angle, the light rays emerging from the image side of the first lens can enable the subsequent optical system to have a larger light receiving surface and reduce the front aperture of the optical system.

[0066] In one embodiment, the optical system satisfies the relation: 0.85 ≤ F2 / F ≤ 1.2; where F2 is the effective focal length of the second lens. Specifically, the value of F2 / F can be 1.068, 1.150, 1.159, 0.873, 1.069, 0.859, 0.935, 0.998, etc. By making the optical system satisfy the above relation, the ratio of the effective focal length of the second lens to the effective focal length of the optical system is reasonably configured, which is beneficial to the second lens converging light, reducing the rear aperture of the optical system subsequent to the second lens, and when the second lens is paired with the first lens having a negative refractive power, it is also beneficial to reducing the overall length of the optical system and realizing the miniaturization of the optical system.

[0067] In one embodiment, the optical system satisfies the relation: 0.65 ≤ F3 / F ≤ 0.7; where F3 is the effective focal length of the third lens. Specifically, the value of F3 / F can be 0.690, 0.686, 0.651, 0.682, 0.655, 0.661, 0.672, 0.678, etc. By making the optical system satisfy the above relation, the ratio of the effective focal length of the third lens to the effective focal length of the optical system is reasonably configured, which is beneficial for the third lens to have an appropriate positive optical power, effectively optimizing spherical aberration and realizing high-quality imaging of the optical system.

[0068] In one embodiment, the optical system satisfies the relation: 0.22 ≤ BFL / F ≤ 0.3; where BFL is the distance from the image side of the sixth lens to the imaging surface on the optical axis. Specifically, the value of BFL / F can be 0.229, 0.270, 0.284, 0.252, 0.260, 0.221, 0.297, 0.264, etc. By making the optical system satisfy the above relation, the ratio of the distance from the image side of the sixth lens to the imaging surface on the optical axis to the effective focal length of the optical system is reasonably configured, which is beneficial to reasonably setting the optical back focal length of the optical system, enabling the light rays to transition to the imaging surface more smoothly and improving the resolution ability of the optical system.

[0069] In one embodiment, the optical system satisfies the relationship: -1.5 ≤ F1 / F12 ≤ -0.8; where F12 is the combined effective focal length of the first lens and the second lens. Specifically, the value of F1 / F12 can be -1.452, -0.930, -1.326, -0.892, -1.146, -0.823, -1.034, -1.288, etc. By making the optical system satisfy the above relationship, the ratio of the effective focal length of the first lens to the combined effective focal length of the first lens and the second lens is reasonably configured, which is beneficial to balancing the refractive power distribution between the first lens and the second lens, enabling the aberrations generated by the first lens and the second lens to correct each other, and improving the imaging quality of the optical system.

[0070] In one embodiment, the optical system satisfies the relationship: -2.5 ≤ F5 / F4 ≤ -1.8; where F5 is the effective focal length of the fifth lens and F4 is the effective focal length of the fourth lens. Specifically, the value of F5 / F4 can be -1.886, -1.909, -2.473, -2.046, -2.495, -1.835, -2.111, -2.234, etc. By making the optical system satisfy the above relationship, the ratio of the effective focal length of the fifth lens to the effective focal length of the fourth lens is reasonably configured, which is beneficial to balancing the refractive power distribution between the fourth lens and the fifth lens, enabling the aberrations generated by the fourth lens and the fifth lens to correct each other, and improving the imaging quality of the optical system.

[0071] In one embodiment, the optical system satisfies the relationship: 0.25 ≤ SAG3 / CT2 ≤ 0.4; where SAG3 is the sagitta at the maximum effective aperture of the object side of the second lens, that is, the distance from the intersection of the object side of the second lens and the optical axis to the maximum effective aperture of the object side of the second lens in the direction parallel to the optical axis, and CT2 is the thickness of the second lens on the optical axis. Specifically, the value of SAG3 / CT2 can be 0.393, 0.284, 0.345, 0.275, 0.315, 0.253, 0.302, 0.373, etc. By making the optical system satisfy the above relationship, the ratio of the sagitta at the maximum effective aperture of the object side of the second lens to the thickness of the second lens on the optical axis is reasonably configured, which is beneficial to reasonably controlling the refractive power and thickness of the second lens at various positions perpendicular to the optical axis, avoiding the second lens being too thick or too thin, reducing the incident angle of light on the object side of the second lens, and reducing the tolerance sensitivity of the optical system.

[0072] In one embodiment, the optical system satisfies the relation: 0.65 ≤ CT4 / CT3 ≤ 1.4; where CT4 is the thickness of the fourth lens on the optical axis, and CT3 is the thickness of the third lens on the optical axis. Specifically, the value of CT4 / CT3 can be 1.048, 0.877, 0.693, 1.328, 0.826, 0.655, 0.997, 1.281, etc. By making the optical system satisfy the above relation, the ratio of the thickness of the fourth lens on the optical axis to the thickness of the third lens on the optical axis is reasonably configured, and the third lens and the fourth lens can regulate each other, maintaining the characteristic of miniaturization of the optical system.

[0073] In one embodiment, the optical system satisfies the relation: 0.9 ≤ AT23 / CT3 ≤ 1.45; where AT23 is the distance on the optical axis from the image side of the second lens to the object side of the third lens. Specifically, the value of AT23 / CT3 can be 1.408, 1.224, 0.912, 1.356, 1.136, 0.955, 1.044, 1.223, etc. By making the optical system satisfy the above relation, the ratio of the spacing distance between the second lens and the third lens to the thickness of the third lens on the optical axis is reasonably configured, which is beneficial to regulating the positional relationship between the second lens and the third lens, enabling the spacing distance between the second lens and the third lens to be reasonably set, improving the manufacturability of the optical system, and using this spacing distance to reduce aberration and tolerance sensitivity.

[0074] In one embodiment, the optical system satisfies the relation: 3.2 ≤ F5 / CT5 ≤ 8.1; where CT5 is the thickness of the fifth lens on the optical axis. Specifically, the value of F5 / CT5 can be 3.237, 8.068, 6.115, 7.306, 5.920, 4.721, 5.333, 6.821, etc. By making the optical system satisfy the above relation, the ratio of the effective focal length of the fifth lens to the thickness of the fifth lens on the optical axis is reasonably configured, which is beneficial to simplifying the surface shape setting of the fifth lens.

[0075] In one embodiment, the optical system satisfies the relation: -20 ≤ F6 / CT6 ≤ -12; where F6 is the effective focal length of the sixth lens, and CT6 is the thickness of the sixth lens on the optical axis. Specifically, the value of F6 / CT6 can be -18.368, -12.236, -17.176, -12.986, -17.894, -14.521, -19.631, -15.823, etc. By making the optical system satisfy the above relation, the ratio of the effective focal length of the sixth lens to the thickness of the sixth lens on the optical axis is reasonably configured, which is beneficial to simplifying the surface shape setting of the sixth lens.

[0076] In one embodiment, the optical system satisfies the relation: 25 ≤ 180° × TTL / IMGH / FOV ≤ 40. Specifically, the value of 180° × TTL / IMGH / FOV can be 39.765, 35.426, 27.946, 28.305, 33.372, 25.182, 30.233, 26.731, etc. By making the optical system satisfy the above relation, a balance is achieved among the total length, image height, and field of view angle of the optical system, which is beneficial for the optical system to balance miniaturization, long focal length, and large image plane, and improve the imaging quality of the optical system.

[0077] In one embodiment, the optical system satisfies the relation: -1.5 ≤ R5 / R6 ≤ -1.1; 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 can be -1.400, -1.390, -1.435, -1.194, -1.113, -1.214, -1.300, -1.498, etc. By making the optical system satisfy the above relation, it is beneficial to rationally configure the ratio of the curvature radius of the object side of the third lens on the optical axis to the curvature radius of the image side 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.

[0078] In one embodiment, the optical system satisfies the relation: -1.2 ≤ R7 / R8 ≤ -0.8; where R7 is the curvature radius of the object side of the fourth lens on the optical axis, and R8 is the curvature radius of the image side of the fourth lens on the optical axis. Specifically, the value of R7 / R8 can be -1.066, -0.928, -0.869, -1.050, -1.128, -0.805, -0.984, -1.176, etc. By making the optical system satisfy the above relation, it is beneficial to rationally configure the ratio of the curvature radius of the object side of the fourth lens on the optical axis to the curvature radius of the image side of the fourth lens on the optical axis, control the shape of the fourth 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 fourth lens.

[0079] In one embodiment, the optical system satisfies the relation: 1.64 ≤ FNO ≤ 1.7; where R3 is the radius of curvature of the object side surface of the second lens, and R4 is the radius of curvature of the image side surface of the second lens. Specifically, the value of FNO can be 1.650, 1.668, 1.680, 1.649, 1.681, 1.696, 1.657, 1.673, etc. By making the optical system satisfy the above relation, it is beneficial to control the shape of the second lens, comprehensively balance the spherical aberration, chromatic aberration and field curvature of the optical system, and reduce the risk of ghosting, thereby improving the resolution ability of the optical system.

[0080] In one embodiment, the optical system satisfies the relation: -0.6 ≤ F4 / F ≤ -0.54. Specifically, the value of F4 / F can be -0.550, -0.564, -0.563, -0.583, -0.557, -0.547, -0.592, -0.574, 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.

[0081] In one embodiment, the optical system satisfies the relation: 1 ≤ F5 / F ≤ 1.4; where F5 is the effective focal length of the fifth lens. Specifically, the value of F5 / F can be 1.038, 1.078, 1.393, 1.193, 1.390, 1.225, 1.343, 1.279, 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.

[0082] In one embodiment, the optical system satisfies the relation: -1.2 ≤ F6 / F ≤ -0.85; where F6 is the effective focal length of the sixth lens. Specifically, the value of F6 / F can be -0.919, -1.022, -1.139, -0.882, -1.123, -0.853, -0.962, -1.185, etc. By making the optical system satisfy the above relation, it is beneficial for the refractive power of the sixth lens to be properly matched in the optical system, the surface shape design of the sixth lens 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.

[0083] In one embodiment, the optical system satisfies the relation: 0.1 ≤ R1 / R2 ≤ 0.35; where R1 is the curvature radius of the object side surface of the first lens on the optical axis, and R2 is the curvature radius of the image side surface of the first lens on the optical axis. Specifically, the value of R1 / R2 can be 0.323, 0.129, 0.197, 0.215, 0.198, 0.266, 0.281, 0.348, etc. 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 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.

[0084] In one embodiment, the optical system satisfies the relation: -0.8 ≤ R3 / R4 ≤ -0.15; where R3 is the curvature radius of the object side surface of the second lens on the optical axis, and 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 -0.352, -0.453, -0.177, -0.795, -0.283, -0.507, -0.636, -0.711, etc. 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 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.

[0085] In one embodiment, the optical system satisfies the relation: -0.7 ≤ R9 / R10 ≤ -0.35; 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. Specifically, the value of R9 / R10 can be -0.557, -0.453, -0.679, -0.619, -0.385, -0.357, -0.406, -0.582, etc. 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, 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 fifth lens.

[0086] In one embodiment, the optical system satisfies the relationship: |R11 / R12| ≤ 0.2; where R11 is the curvature radius of the object side of the sixth lens at the optical axis, and R12 is the curvature radius of the image side of the sixth lens at the optical axis. Specifically, the value of |R11 / R12| can be 0.029, 0.192, 0.146, 0.019, 0.190, 0.047, 0.086, 0.163, etc. By making the optical system satisfy the above relationship, it is beneficial to rationally configure the ratio of the curvature radius of the object side of the sixth lens at the optical axis to the curvature radius of the image side 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, 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.

[0087] In one embodiment, the optical system satisfies the relationship: 0.4 ≤ CT6 / ET6 ≤ 0.52. Specifically, the value of CT6 / ET6 can be 0.411, 0.505, 0.444, 0.460, 0.485, 0.423, 0.479, 0.518, etc. By making the optical system satisfy the above relationship, the ratio of the thickness of the sixth lens on the optical axis to the edge thickness of the sixth lens is rationally configured, which is beneficial to simplify the production and manufacturing of the sixth lens.

[0088] In some embodiments, the optical system further includes a filter. The filter can be an infrared cut-off filter, an infrared band-pass filter or a dichroic filter. In this application, the 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, the 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, the dichroic filter can also be selected as the filter, which can simultaneously transmit visible light and transmit part of the infrared light, so as to realize different band selections, and can realize both visible light imaging and infrared imaging, so as to achieve day and night use. The filter can be assembled with each lens as a part of the optical system. In 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 other materials of the filter, which can be selected according to actual needs and are not specifically limited in this embodiment. In 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.

[0089] In some embodiments, at least one lens in the optical system may have a spherical surface profile. The design of the spherical surface profile can reduce the difficulty of lens fabrication and the manufacturing cost. In some embodiments, at least one lens of the optical system may also have an aspherical surface profile. When at least one side surface (object side or image side) of the lens is aspherical, the lens can be said to have an aspherical surface profile. 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 correct aberrations and improve the imaging quality. In some embodiments, in order to balance the manufacturing cost, fabrication difficulty, imaging quality, assembly difficulty, etc., the design of each lens surface in the optical system can be a combination of spherical and aspherical surface profiles. In this application, the second lens has an aspherical surface profile, and the first lens, the third lens, the fourth lens, the fifth lens, and the sixth lens have spherical surface profiles.

[0090] 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 material. By utilizing the effect of reducing temperature drift of the glass material of the first lens L1, the influence of ambient temperature change on the optical system can be effectively reduced, and thus a better and more stable imaging quality can be maintained. 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, resin, etc. Lenses with plastic material can reduce the production cost of the optical system, while lenses with glass material can withstand higher or lower temperatures and have excellent optical effects and better stability. In some embodiments, lenses with different materials can be arranged in the optical system, that is, a design combining glass lenses and plastic lenses can be adopted, but the specific configuration relationship can be determined according to actual needs and will not be elaborated here.

[0091] First Embodiment

[0092] 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:

[0093] The first lens L1, having a negative refractive power. The object side surface S1 of the first lens L1 is concave near the optical axis, and the image side surface S2 is convex near the optical axis.

[0094] The second lens L2, having a positive refractive power. The object side surface S3 of the second lens L2 is convex near the optical axis, and the image side surface S4 is convex near the optical axis.

[0095] The third lens L3, having a positive refractive power. The object side surface S5 of the third lens L3 is convex near the optical axis, and the image side surface S6 is convex near the optical axis.

[0096] The fourth lens L4 has a negative refractive power. The object side surface S7 of the fourth lens L4 is concave near the optical axis, and the image side surface S8 of the fourth lens L4 is concave near the optical axis.

[0097] The fifth lens L5 has a positive refractive power. The object side surface S9 of the fifth lens L5 is convex near the optical axis, and the image side surface S10 of the fifth lens L5 is convex near the optical axis.

[0098] The sixth lens L6 has a negative refractive power. The object side surface S11 of the sixth lens L6 is concave near the optical axis, and the image side surface S12 of the sixth lens L6 is concave near the optical axis.

[0099] In addition, the optical system 10 further includes a diaphragm STO, a filter IR, a protective glass CG, and an imaging surface IMG. In this embodiment, the diaphragm STO is disposed between the image side surface of the first lens L1 and the object side surface of the second lens L2 of the optical system 10 for controlling the light incident amount. The filter IR is disposed between the sixth lens L6 and the protective glass CG. It includes an object side surface S13 and an image side surface S14. The 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. The wavelength of the visible light is 380 nm - 780 nm. The material of the infrared cut-off filter can be glass or plastic, and a coating can be applied on its surface. The protective glass CG is disposed between the filter IR and the imaging surface IMG. It includes an object side surface S15 and an image side surface S16. The materials of the first lens L1 to the sixth lens L6 can be glass or plastic. The effective pixel region of the photosensitive chip is located on the imaging surface. An infrared light photosensitive chip is disposed at the imaging surface IMG, and the photosensitive chip captures different band information of an 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 surface or the image side surface of the corresponding surface number at the optical axis. The surface numbers S1 and S2 are the object side surface S1 and the image side surface S2 of the first lens L1 respectively. That is, in the same lens, the surface with a smaller surface number is the object side surface, and the surface with a larger surface number is the image side surface. 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 surface 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] Wherein, F is the effective focal length of the optical system 10, FNO is the f-number of the optical system 10, FOV is the maximum field of view angle of the optical system 10, and TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, that is, the total optical length.

[0104] In this embodiment, both the object side surface and the image side surface of the second lens L2 are aspherical surfaces. The surface profile x of the aspherical surface 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 surface vertex, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspherical surface profile formula.

[0107] Table 1b gives the high-order term coefficients A4, A6, A8, A10, A12, A14, and A16 of the aspherical mirrors S3 and S4 that can be used in the first embodiment;

[0108] Table 1b

[0109]

[0110] Figure 2 In (a), the longitudinal spherical aberration curves of the optical system 10 of the first embodiment at wavelengths of 680.0000 nm, 650.0000 nm, 610.0000 nm, 555.0000 nm, 510.0000 nm, 470.0000 nm, and 430.0000 nm are shown. Among them, the abscissa along the X-axis direction represents the focus shift, that is, the distance from the imaging surface 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 (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 by the optical system 10, indicating that the imaging quality of the optical system 10 in this embodiment is good.

[0111] Figure 2 In (b), the astigmatism curve of the optical system 10 of the first embodiment at a wavelength of 555.0000 nm is also shown. Among them, the abscissa along the X-axis direction represents the focus shift, and the ordinate along the Y-axis direction represents the field of view 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 2As can be seen from Fig. (b), the Petzval field of the optical system 10 is small, and the Petzval field and astigmatism of each field of view are well corrected, and clear imaging is achieved both at the center and the edge of the field of view.

[0112] Figure 2 Fig. (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, with the unit of %, and the ordinate along the Y-axis direction represents the field angle, with the unit of deg. The distortion curve represents the distortion magnitude values corresponding to different field angles. From Figure 2 As can be seen from Fig. (c), at a wavelength of 555.0000 nm, the image deformation caused by the chief ray is small, and the imaging quality of the system is excellent.

[0113] From Figure 2 Fig. (a), Figure 2 Fig. (b) and Figure 2 Fig. (c), it can be seen that the optical system 10 of this embodiment has small aberrations and good imaging quality, and has good imaging performance.

[0114] Second Embodiment

[0115] 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:

[0116] The first lens L1, having a negative refractive power, the object side surface S1 of the first lens L1 is concave near the optical axis, and the image side surface S2 is convex near the optical axis.

[0117] The second lens L2, having a positive refractive power, the object side surface S3 of the second lens L2 is convex near the optical axis, and the image side surface S4 is convex near the optical axis.

[0118] The third lens L3, having a positive refractive power, the object side surface S5 of the third lens L3 is convex near the optical axis, and the image side surface S6 is convex near the optical axis.

[0119] The fourth lens L4, having a negative refractive power, the object side surface S7 of the fourth lens L4 is concave near the optical axis, and the image side surface S8 is concave near the optical axis.

[0120] The fifth lens L5, having a positive refractive power, the object side surface S9 of the fifth lens L5 is convex near the optical axis, and the image side surface S10 is convex near the optical axis.

[0121] The sixth lens L6, having a negative refractive power, the object side surface S11 of the sixth lens L6 is concave near the optical axis, and the image side surface S12 is concave near the optical axis.

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

[0123] Table 2a shows the parameters of the optical system 10 of this embodiment. Among them, the focal length, material refractive index, and Abbe number are all obtained with visible light having a reference wavelength of 555 nm. The units of the Y radius, thickness, and effective focal length are all millimeters (mm), and the meanings of the other parameters are the same as those of the parameters in the first embodiment;

[0124] Table 2a

[0125]

[0126] Table 2b gives the high-order term coefficients of the aspherical mirrors that can be used in the second embodiment. Among them, the aspherical surface types can be defined by the formulas given in the first embodiment;

[0127] Table 2b

[0128]

[0129] Figure 4 in (a), Figure 4 in (b), Figure 4 in (c) respectively show the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system 10 of the second embodiment. Among them, the longitudinal spherical aberration curve represents the deviation of the convergence focal points of light rays of different wavelengths after passing through each lens of the optical system 10; the astigmatism curve represents the meridional field curvature and sagittal field curvature; the distortion curve represents the distortion magnitude values corresponding to different field angles. It can be seen from Figure 4 the aberration diagram in 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.

[0130] Third Embodiment

[0131] 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:

[0132] The first lens L1 has negative refractive power. The object side surface S1 of the first lens L1 is concave near the optical axis, and the image side surface S2 is convex near the optical axis.

[0133] The second lens L2 has positive refractive power. The object side surface S3 of the second lens L2 is convex near the optical axis, and the image side surface S4 is convex near the optical axis.

[0134] The third lens L3 has positive refractive power. The object side surface S5 of the third lens L3 is convex near the optical axis, and the image side surface S6 is convex near the optical axis.

[0135] The fourth lens L4 has negative refractive power. The object side surface S7 of the fourth lens L4 is concave near the optical axis, and the image side surface S8 is concave near the optical axis.

[0136] The fifth lens L5 has a positive refractive power. The object side surface S9 of the fifth lens L5 is convex near the optical axis, and the image side surface S10 of the fifth lens L5 is convex near the optical axis.

[0137] The sixth lens L6 has a negative refractive power. The object side surface S11 of the sixth lens L6 is concave near the optical axis, and the image side surface S12 of the sixth lens L6 is convex near the optical axis.

[0138] The other structures of the third embodiment are the same as those of the first embodiment, and can be referred to.

[0139] Table 3a shows the parameters of the optical system 10 of this embodiment. Among them, the focal length, material refractive index, and Abbe number are all obtained with visible light having a reference wavelength of 555 nm. The units of the Y radius, thickness, and effective focal length are all millimeters (mm), and the meanings of the other parameters are the same as those of the first embodiment;

[0140] Table 3a

[0141]

[0142] Table 3b gives the high-order term coefficients of the aspherical mirror surfaces that can be used in the third embodiment. Among them, the aspherical surface types can be defined by the formulas given in the first embodiment;

[0143] Table 3b

[0144]

[0145] 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 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 the optical system 10 of this embodiment has good imaging quality.

[0146] Fourth Embodiment

[0147] Please refer to Figure 7 , the optical system 10 of this embodiment sequentially includes, from the object side to the image side along the optical axis direction:

[0148] 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 of the first lens L1 is convex near the optical axis.

[0149] The second lens L2 has a positive refractive power. The object side surface S3 of the second lens L2 is convex near the optical axis, and the image side surface S4 of the second lens L2 is convex near the optical axis.

[0150] 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.

[0151] The fourth lens L4 has a negative refractive power. The object side surface S7 of the fourth lens L4 is concave near the optical axis, and the image side surface S8 of the fourth lens L4 is concave near the optical axis.

[0152] The fifth lens L5 has a positive refractive power. The object side surface S9 of the fifth lens L5 is convex near the optical axis, and the image side surface S10 of the fifth lens L5 is convex near the optical axis.

[0153] The sixth lens L6 has a negative refractive power. The object side surface S11 of the sixth lens L6 is concave near the optical axis, and the image side surface S12 of the sixth lens L6 is convex near the optical axis.

[0154] The other structures of the fourth embodiment are the same as those of the first embodiment, and can be referred to.

[0155] Table 4a shows the various parameters of the optical system 10 of this embodiment. Among them, the focal length, material refractive index, and Abbe number are all obtained with visible light having a reference wavelength of 555 nm. The units of the Y radius, thickness, and effective focal length are all millimeters (mm), and the meanings of the other parameters are the same as those of the parameters in the first embodiment;

[0156] Table 4a

[0157]

[0158] Table 4b gives the high-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;

[0159] Table 4b

[0160]

[0161] Figure 8 In (a), Figure 8 In (b), Figure 8 In (c) respectively show the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system 10 of the fourth embodiment. Among them, the longitudinal spherical aberration curve represents the deviation of the convergence focal points of light rays of different wavelengths after passing through the respective 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. Figure 8From the aberration diagram, it can be seen that the longitudinal spherical aberration, field curvature, and distortion of the optical system 10 are all well controlled, so the optical system 10 of this embodiment has good imaging quality.

[0162] Fifth Embodiment

[0163] Please refer to Figure 9 , the optical system 10 of this embodiment sequentially includes, from the object side to the image side along the optical axis direction:

[0164] The first lens L1 has a negative refractive power. The object side surface S1 of the first lens L1 is concave near the optical axis, and the image side surface S2 is convex near the optical axis.

[0165] 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.

[0166] 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.

[0167] The fourth lens L4 has a negative refractive power. The object side surface S7 of the fourth lens L4 is concave near the optical axis, and the image side surface S8 is concave near the optical axis.

[0168] The fifth lens L5 has a positive refractive power. The object side surface S9 of the fifth lens L5 is convex near the optical axis, and the image side surface S10 is convex near the optical axis.

[0169] The sixth lens L6 has a negative refractive power. The object side surface S11 of the sixth lens L6 is concave near the optical axis, and the image side surface S12 is convex near the optical axis.

[0170] The other structures of the fifth embodiment are the same as those of the first embodiment, and can be referred to.

[0171] Table 5a shows the parameters of the optical system 10 of this embodiment. Among them, the focal length, material refractive index, and Abbe number are all obtained with visible light having a reference wavelength of 555 nm. The units of the Y radius, thickness, and effective focal length are all millimeters (mm), and the meanings of the other parameters are the same as those of the parameters in the first embodiment;

[0172] Table 5a

[0173]

[0174] Table 5b gives the high-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;

[0175] Table 5b

[0176]

[0177] Figure 10 In (a), Figure 10 In (b), Figure 10 In (c), the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system 10 of the fifth embodiment are respectively shown. Among them, the longitudinal spherical aberration curve represents the deviation of the 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.

[0178] Table 6 shows the values of FOV, TTL / F, TTL / IMGH, FOV / FNO, F / IMGH, ∑CT / TTL, TTL / CTMAX, ∑CT / ∑AT, SD3 / SD2, SD1 / SD12, SD3 / CT2, F1 / F, F2 / F, F3 / F, BFL / F, F1 / F12, F5 / F4, SAG3 / CT2, CT4 / CT3, AT23 / CT3, F5 / CT5, F6 / CT6, 180°×TTL / IMGH / FOV, R5 / R6, R7 / R8, FNO, F4 / F, F5 / F, F6 / F, R1 / R2, R3 / R4, R9 / R10, |R11 / R12|, and CT6 / ET6 in the optical system 10 of the first to fifth embodiments;

[0179] Table 6

[0180]

[0181] As can be seen from Table 6, the optical systems of the first to fifth embodiments all satisfy the following relationships: 32deg ≤ FOV ≤ 45deg, 2 ≤ TTL / F ≤ 2.71, 5.9 ≤ TTL / IMGH ≤ 7.9, 20deg ≤ FOV / FNO ≤ 27deg, 2.6 ≤ F / IMGH ≤ 3.4, 0.59 ≤ ∑CT / TTL ≤ 0.66, 6 ≤ TTL / CTMAX ≤ 7.4, 2 ≤ ∑CT / ∑AT ≤ 2.95, 1.02 ≤ SD3 / SD2 ≤ 1.16, 1.05 ≤ SD1 / SD12 ≤ 1.35, 1.05 ≤ SD3 / CT2 ≤ 1.45, -2.2 ≤ F1 / F ≤ -1.3, 0.85 ≤ F2 / F ≤ 1.2, 0.65 ≤ F3 / F ≤ 0.7, 0.22 ≤ BFL / F ≤ 0.3, -1.5 ≤ F1 / F12 ≤ -0.8, -2.5 ≤ F5 / F4 ≤ -1.8, 0.25 ≤ SAG3 / CT2 ≤ 0.4, 0.65 ≤ CT4 / CT3 ≤ 1.4, 0.9 ≤ AT23 / CT3 ≤ 1.45, 3.2 ≤ F5 / CT5 ≤ 8.1, -20 ≤ F6 / CT6 ≤ -12, 25 ≤ 180°×TTL / IMGH / FOV ≤ 40, -1.5 ≤ R5 / R6 ≤ -1.1, -1.2 ≤ R7 / R8 ≤ -0.8, 1.64 ≤ FNO ≤ 1.7, -0.6 ≤ F4 / F ≤ -0.54, 1 ≤ F5 / F ≤ 1.4, -1.2 ≤ F6 / F ≤ -0.85, 0.1 ≤ R1 / R2 ≤ 0.35, -0.8 ≤ R3 / R4 ≤ -0.15, -0.7 ≤ R9 / R10 ≤ -0.35, |R11 / R12| ≤ 0.2, and 0.4 ≤ CT6 / ET6 ≤ 0.52.

[0182] 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 one 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 rationally 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 miniaturization, high pixel, and large field of view.

[0183] Please refer toFigure 12 , the present invention also provides an electronic device 30, which includes a housing 31 and the above-mentioned camera module 20, and the camera module 20 is disposed within the housing 31. The electronic device 30 includes, but is not limited to, automobiles, monitoring devices, smart phones, computers, smart watches, etc. By incorporating the camera module 20 provided by the present invention into the electronic device 30, the electronic device 30 features miniaturization, high pixel count, and a large field of view.

[0184] 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 the entire or partial processes of implementing the above embodiments, and the equivalent changes made in accordance with the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. An optical system, characterized in that, There are a total of six lenses with refractive power, which sequentially include, from the object side to the image side along the optical axis: The first lens, having negative refractive power, the object side surface of the first lens is concave near the optical axis, and the image side surface of the first lens is convex near the optical axis; The second lens, having positive refractive power, the object side surface of the second lens is convex near the optical axis, and the image side surface of the second lens is convex near the optical axis; The third lens, having positive refractive power, the object side surface of the third lens is convex near the optical axis, and the image side surface of the third lens is convex near the optical axis; The fourth lens, having negative refractive power, the object side surface of the fourth lens is concave near the optical axis, and the image side surface of the fourth lens is concave near the optical axis; The fifth lens, having positive refractive power, the object side surface of the fifth lens is convex near the optical axis, and the image side surface of the fifth lens is convex near the optical axis; The sixth lens, having negative refractive power, the object side surface of the sixth lens is concave near the optical axis; The optical system satisfies the relationship: 32deg ≤ FOV ≤ 45deg, 2 ≤ TTL / F ≤ 2.71; Wherein, FOV is the maximum field of view angle of the optical system, TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, and F is the effective focal length of the optical system.

2. The optical system according to claim 1, wherein The optical system satisfies the relationship: 5.9 ≤ TTL / IMGH ≤ 7.9; 20deg ≤ FOV / FNO ≤ 27deg; and / or, 2.6 ≤ F / IMGH ≤ 3.4; Wherein, IMGH is half of the image height corresponding to the maximum field of view angle of the optical system, and FNO is the f-number of the optical system.

3. The optical system according to claim 1, wherein The optical system satisfies the relationship: 0.59 ≤ ∑CT / TTL ≤ 0.66; and / or, 6 ≤ TTL / CTMAX ≤ 7.4; and / or, 2 ≤ ∑CT / ∑AT ≤ 2.95; Wherein, ∑CT is the sum of the thicknesses of the first lens to the sixth lens on the optical axis, CTMAX is the maximum value of the thicknesses of the first lens to the sixth lens on the optical axis, and ∑AT is the sum of the spacer distances between adjacent two lenses on the optical axis.

4. The optical system according to claim 1, characterized in that, The optical system satisfies the relationship: 1.02 ≤ SD3 / SD2 ≤ 1.16; and / or, 1.05 ≤ SD1 / SD12 ≤ 1.35; and / or, 1.05 ≤ SD3 / CT2 ≤ 1.45; Wherein, SD3 is half of the maximum effective aperture of the object side surface of the second lens, SD2 is half of the maximum effective aperture of the image side surface of the first lens, SD1 is half of the maximum effective aperture of the object side surface of the first lens, SD12 is half of the maximum effective aperture of the image side surface of the sixth lens, and CT2 is the thickness of the second lens on the optical axis.

5. The optical system according to claim 1, characterized in that, The optical system satisfies the relationship: -2.2 ≤ F1 / F ≤ -1.3; and / or, 0.85 ≤ F2 / F ≤ 1.2; and / or, 0.65 ≤ F3 / F ≤ 0.7; and / or, 0.22 ≤ BFL / F ≤ 0.3; Wherein, F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, F3 is the effective focal length of the third lens, and BFL is the distance from the image side of the sixth lens to the imaging surface on the optical axis.

6. The optical system according to claim 1, characterized in that, The optical system satisfies the relational expressions: -1.5 ≤ F1 / F12 ≤ -0.8; and / or, -2.5 ≤ F5 / F4 ≤ -1.8; and / or, 0.25 ≤ SAG3 / CT2 ≤ 0.4; Wherein, F1 is the effective focal length of the first lens, F12 is the combined effective focal length of the first lens and the second lens, F5 is the effective focal length of the fifth lens, F4 is the effective focal length of the fourth lens, SAG3 is the sagitta at the maximum effective aperture of the object side of the second lens, and CT2 is the thickness of the second lens on the optical axis.

7. The optical system according to claim 1, wherein The optical system satisfies the relational expressions: 0.65 ≤ CT4 / CT3 ≤ 1.4; and / or, 0.9 ≤ AT23 / CT3 ≤ 1.45; and / or, 3.2 ≤ F5 / CT5 ≤ 8.1; and / or, -20 ≤ F6 / CT6 ≤ -12; Wherein, CT4 is the thickness of the fourth lens on the optical axis, CT3 is the thickness of the third lens on the optical axis, AT23 is the distance from the image side of the second lens to the object side of the third lens on the optical axis, F5 is the effective focal length of the fifth lens, CT5 is the thickness of the fifth lens on the optical axis, F6 is the effective focal length of the sixth lens, and CT6 is the thickness of the sixth lens on the optical axis.

8. The optical system according to claim 1, characterized in that, The optical system satisfies the relational expressions: 25 ≤ 180°×TTL / IMGH / FOV ≤ 40; and / or, -1.5 ≤ R5 / R6 ≤ -1.1; and / or, -1.2 ≤ R7 / R8 ≤ -0.8; Wherein, IMGH is half of the image height corresponding to the maximum field of view angle of the optical system, R5 is the curvature radius of the object side of the third lens on the optical axis, R6 is the curvature radius of the image side of the third lens on the optical axis, R7 is the curvature radius of the object side of the fourth lens on the optical axis, and R8 is the curvature radius of the image side of the fourth lens on the optical axis.

9. An imaging module, characterized in that, It includes a photosensitive chip and the optical system according to any one of claims 1 to 8, and 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 imaging module according to claim 9, and the imaging module is disposed in the housing.

Images