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 all 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 all 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 imaging clarity, and large field of view.

Description

Technical Field

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

[0002] Benefiting from 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 vehicle-mounted reverse vision systems, dash cams, automatic parking and panoramic parking systems, road navigation systems, etc.

[0003] Vehicle-mounted lenses are key components for autonomous driving assistance systems to obtain external information. Due to safety considerations, the performance requirements for vehicle-mounted lenses are very strict. First, it is required that the vehicle-mounted lens has high imaging clarity and can effectively distinguish the details of the road environment. It is also required that the vehicle-mounted lens can have a large field of view to better collect the road information in front of the vehicle to meet the special requirements of intelligent driving systems. In addition, due to the limited installation space of the vehicle-mounted system, the volume of the vehicle-mounted lens is required not to be too large. Summary of the Invention

[0004] The object of the present invention is to provide an optical system, a camera module, and an electronic device to solve the problem that vehicle-mounted optical systems need to be miniaturized, have high imaging clarity, and have a large field of view.

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

[0006] 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 with negative refractive power, the object side surface of the first lens is concave near the optical axis, and the image side surface of the first lens is convex near the optical axis; a second lens with positive refractive power, the object side surface of the second lens is convex near the optical axis, and the image side surface of the second lens is convex near the optical axis; a third lens with positive refractive power, the object side surface of the third lens is convex near the optical axis, and the image side surface of the third lens is convex near the optical axis; a fourth lens with 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 with 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 with negative refractive power, the object side surface of the sixth lens is concave near the optical axis.

[0007] The optical system satisfies the relational expressions: 30deg ≤ FOV ≤ 45deg, 5.2 ≤ TTL / IMGH ≤ 6.8; where FOV is the maximum field of view of the optical system, TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, and IMGH is half of the image height corresponding to the maximum field of view of the optical system.

[0008] By making the first lens have a negative refractive power, with the object side of the first lens being concave near the optical axis and the image side of the first lens being convex near the optical axis, it is beneficial for the light to enter smoothly, preventing the light from bending too much, effectively reducing the field curvature and astigmatism of the optical system, and reducing the overall sensitivity of the optical system; by making the second lens have a positive refractive power, with the object side of the second lens being convex near the optical axis and the image side of the second lens being convex near the optical axis, it is beneficial for initially correcting the astigmatism of the optical system and effectively controlling the trend of the light, achieving a larger aperture; by making the third lens have a positive refractive power, with the object side of the third lens being convex near the optical axis and the image side of the third lens being convex near the optical axis, it is beneficial for 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 of the fourth lens being concave near the optical axis and the image side of the fourth lens being concave near the optical axis, it is beneficial for the marginal light to enter and be refracted, reducing the refraction angle borne by the subsequent lenses, making the refraction angles of the light on each lens more uniform, and effectively correcting the aberration of the marginal field of view; the 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, thus enhancing the imaging quality of the optical system; by making the fifth lens have a positive refractive power, with the object side of the fifth lens being convex near the optical axis and the image side 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 of the sixth lens being concave near the optical axis, it is beneficial for depressing the light incident angle after passing through the aperture stop, allowing more light to enter the optical system on the image side, and improving the illuminance of the optical system.

[0009] By making the optical system satisfy the relationship: 30deg ≤ 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 satisfy the miniaturization characteristics while obtaining sufficient field of view.

[0010] By making the optical system satisfy the relationship: 5.2 ≤ TTL / IMGH ≤ 6.8, the ratio of the total length to the image height of the optical system is reasonably configured. Combining with the above range of the maximum field of view angle of the optical system, it is beneficial for restricting the total length of the optical system and achieving the miniaturization of the optical system.

[0011] In one embodiment, the optical system satisfies the relation: 18deg ≤ 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, improving the overall illuminance of the imaging picture, and making the optical system suitable for different lighting environments.

[0012] In one embodiment, the optical system satisfies the relation: 1.6 ≤ FNO ≤ 1.8. By making the optical system satisfy the above relation, the f-number of the optical system is set within a reasonable range, achieving the combined effect of a larger field of view angle and a large aperture for the optical system, the optical system has a reasonable light input, improving the overall illuminance of the imaging picture, and making the optical system suitable for different lighting environments.

[0013] In one embodiment, the optical system satisfies the relation: 7.9mm ≤ TTL×IMGH / F ≤ 11mm; where F is the effective focal length of the optical system. By making the optical system satisfy the above relation, the optical system can be adapted to a large-sized imaging surface, which is beneficial for the optical system to meet the performance requirements of miniaturization and a large target surface simultaneously.

[0014] In one embodiment, the optical system satisfies the relation: 0.19 ≤ (CT3 + CT4) / TTL ≤ 0.35; where CT3 is the thickness of the third lens on the optical axis, and CT4 is the thickness of the fourth lens on the optical axis. By making the optical system satisfy the above relation, the central thickness of the cemented lens composed of the third lens and the fourth lens is reasonably configured, which is beneficial for enhancing the light control ability of the third lens and the fourth lens, facilitating more light to enter the optical system behind the fourth lens, and improving the relative illuminance of the optical system.

[0015] In one embodiment, the optical system satisfies the relation: 3 ≤ (CT2 + CT3) / CT23 ≤ 55; where CT2 is the thickness of the second lens on the optical axis, and CT23 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 thicknesses of the second lens and the third lens on the optical axis are reasonably set, which is beneficial for simplifying the surface shape settings of the second lens and the third lens, enabling the second lens and the third lens to adjust each other and reduce aberration; at the same time, the distance between the second lens and the third lens on the optical axis is also reasonably set, which is beneficial for controlling the incident angle of light and maintaining the miniaturization feature of the optical system.

[0016] In one embodiment, the optical system satisfies the relation: 0.7 ≤ CT3 / CT4 ≤ 5.1. By making the optical system satisfy the above relation, the ratio of the thickness of the third lens on the optical axis to the thickness of the fourth lens on the optical axis is reasonably configured, and the third lens and the fourth lens can regulate each other to maintain the miniaturization feature of the optical system.

[0017] In one embodiment, the optical system satisfies the relation: 0.85 ≤ SD1 / IMGH ≤ 1.3; where SD1 is half of the maximum effective aperture of the object side of the first lens. By making the optical system satisfy the above relation, the ratio of half of the maximum effective aperture of the object side of the first lens to half of the image height corresponding to the maximum field of view angle of the optical system is reasonably configured, which is beneficial to reasonably control the size of the object side of the first lens and realize the miniaturization of the optical system.

[0018] In one embodiment, the optical system satisfies the relation: 5.2 ≤ TTL / SDL1 ≤ 6.3; where SDL1 is half of the maximum effective aperture of the larger one of the object side and the image side of the first lens. By making the optical system satisfy the above relation, the ratio of the total length of the optical system to half of the maximum effective aperture of the larger one of the object side and the image side of the first lens is reasonably configured. When the total length of the optical system is fixed, the size of the first lens can be reasonably limited, which is beneficial to limiting the head size of the optical system and realizing the miniaturization of the optical system.

[0019] In one embodiment, the optical system satisfies the relation: 0.78 ≤ SD9 / SD1 ≤ 0.97; where SD9 is half of the maximum effective aperture of the object side of the fifth lens. By making the optical system satisfy the above relation, it is beneficial to reasonably configure 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 object side of the fifth lens, and further control the outer diameter size of the lens group in the optical system to reduce the thickness in the radial direction of the optical system, thereby meeting the requirement of miniaturizing the optical system.

[0020] In one embodiment, the optical system satisfies the relation: 0.9 ≤ F3 / F ≤ 1.2; where F3 is the effective focal length of the third lens and F is the effective focal length of the optical system. By making the optical system satisfy the above relation, it is beneficial for the refractive power of the third lens in the optical system to be properly matched. The surface shape design of the third lens is more simple and flexible, reducing aberration and simplifying the aberration correction and imaging quality balance of the overall optical system.

[0021] In one embodiment, the optical system satisfies the relation: -10 ≤ F4 / CT4 ≤ -1.5; where F4 is the effective focal length of the fourth lens, and CT4 is the thickness of the fourth lens on the optical axis. By making the optical system satisfy the above relation, the ratio of the effective focal length of the fourth lens to the thickness of the fourth lens on the optical axis is reasonably configured, which is beneficial to simplifying the surface shape setting of the fourth lens.

[0022] In one embodiment, the optical system satisfies the relation: -1.2 ≤ F / F34 ≤ -0.2; where F34 is the combined effective focal length of the third lens and the fourth lens. By making the optical system satisfy the above relation, the ratio of the effective focal length of the optical system to the effective focal length of the cemented lens composed of the third lens and the fourth lens is reasonably configured, which is beneficial to correcting chromatic aberration and balancing various aberrations, improving the resolution ability of the optical system, effectively reducing the tolerance sensitivity of the optical system, and further improving the imaging quality of the optical system.

[0023] In one embodiment, the optical system satisfies the relation: -1.4 ≤ (VD3 - VD4) / F34 ≤ -0.35 ; where VD3 is the Abbe number of the third lens, and VD4 is the Abbe number of the fourth lens. By making the optical system satisfy the above relation, the ratio of the difference between the Abbe number of the third lens and the Abbe number of the fourth lens to the combined focal length of the third lens and the fourth lens is reasonably configured, which is beneficial to effectively correcting the chromatic aberration of the optical system, and the imaging effectively restores the authenticity of colors, and further improves the imaging quality of the optical system.

[0024] In one embodiment, the optical system satisfies the relation: 0.67 ≤ CT1 / ET1 ≤ 0.96; where CT1 is the thickness of the first lens on the optical axis, and ET1 is the edge thickness of the first lens, that is, the distance between the maximum effective aperture of the object side of the first lens and the maximum effective aperture of the image side in the direction parallel to the optical axis. By making the optical system satisfy the above relation, the ratio of the thickness of the first lens on the optical axis to the edge thickness of the first lens is reasonably configured, which is beneficial to simplifying the production and manufacturing of the first lens.

[0025] In one embodiment, the optical system satisfies the relation: 1.15 ≤ CT2 / ET2 ≤ 1.55; where CT2 is the thickness of the second lens on the optical axis, and ET2 is the edge thickness of the second lens, that is, the distance between the maximum effective aperture of the object side of the second lens and the maximum effective aperture of the image side in the direction parallel to the optical axis. By making the optical system satisfy the above relation, the ratio of the thickness of the second lens on the optical axis to the edge thickness of the second lens is reasonably configured, which is beneficial to simplifying the production and manufacturing of the second lens.

[0026] In one embodiment, the optical system satisfies the relation: -14 ≤ (F1 + F2) / F ≤ -1.5; where F1 is the effective focal length of the first lens and F2 is the effective focal length of the second lens. By making the optical system satisfy the above relation, the ratio of the sum of the effective focal lengths of the first lens and the second lens to the effective focal length of the optical system is reasonably configured, which is beneficial to the mutual correction of the aberrations generated by the first lens and the second lens, and thus improves the imaging quality of the optical system.

[0027] In one embodiment, the optical system satisfies the relation: -2.5 ≤ SAG11 / CT6 ≤ -1; where SAG11 is the sagitta at the maximum effective aperture of the object side surface of the sixth lens, that is, the distance from the intersection of the object side surface of the sixth lens and the optical axis to the maximum effective aperture of the object side surface of the sixth lens in the direction parallel to the optical axis, and CT6 is the thickness of the sixth lens on the optical axis. By making the optical system satisfy the above relation, it is beneficial to reasonably control the refractive power and thickness of the sixth lens at various positions perpendicular to the optical axis, avoid the sixth lens being too thick or too thin, reduce the incident angle of light on the object side surface of the sixth lens, and reduce the tolerance sensitivity of the optical system.

[0028] In one embodiment, the optical system satisfies the relation: 7 ≤ |SAG11 / SAG12| ≤ 31; where SAG12 is the sagitta at the maximum effective aperture of the image side surface of the sixth lens, that is, the distance from the intersection of the image side surface of the sixth lens and the optical axis to the maximum effective aperture of the image side surface of the sixth lens in the direction parallel to the optical axis. By making the optical system satisfy the above relation, it is beneficial to reasonably control the shape of the sixth lens and correct the distortion and field curvature generated by the lens on the object side of the sixth lens.

[0029] In one embodiment, the optical system satisfies the relation: 0.25 ≤ CT6 / ET6 ≤ 0.55; where ET6 is the edge thickness of the sixth lens, that is, the distance from the maximum effective aperture of the object side surface of the sixth lens to the maximum effective aperture of the image side surface in the direction parallel to the optical axis. By making the optical system satisfy the above relation, the ratio of the thickness of the sixth lens on the optical axis to the edge thickness of the sixth lens is reasonably configured, which is beneficial to simplifying the production and manufacturing of the sixth lens.

[0030] In one embodiment, the optical system satisfies the relation: 1.1 ≤ |(R3 - R4) / (R3 + R4)| ≤ 6.3; where R3 is the radius of curvature of the object side surface of the second lens on the optical axis and R4 is the radius of curvature of the image side surface of the second lens on the optical axis. 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 generating ghost images, thereby improving the resolution ability of the optical system.

[0031] In one embodiment, the optical system satisfies the relation: 8 ≤ |R12 / R11| ≤ 31; where R11 is the radius of curvature of the object side surface of the sixth lens on the optical axis, and R12 is the radius of curvature of the image side surface of the sixth lens on the optical axis. By making the optical system satisfy the above relation, it is beneficial to rationally configure the ratio of the radius of curvature of the object side surface of the sixth lens on the optical axis to the radius of curvature of the image side surface of the sixth lens on 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.

[0032] In one embodiment, the optical system satisfies the relation: 4.5 ≤ |R12 / F| ≤ 19. By making the optical system satisfy the above relation, the ratio of the radius of curvature of the image side surface of the sixth lens to the effective focal length of the optical system is rationally configured, which is beneficial to increasing the image height of the optical system on the premise of keeping the field of view angle unchanged, enabling the optical system to receive light at a larger angle, reducing the distortion of the optical system. At the same time, the turning angle of the light when it reaches the sixth lens is small, which is beneficial to reducing the tolerance sensitivity of the optical system.

[0033] In a second aspect, the present invention also provides an imaging module, which includes a photosensitive chip and the optical system according to any one of the embodiments in the first aspect. The photosensitive chip is arranged on the image side of the optical system. Among them, 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 high imaging clarity and a large field of view angle.

[0034] In a third aspect, the present invention also provides an electronic device, which includes a housing and the imaging module according to the second aspect. The imaging module is arranged in the housing. The electronic device includes but is not limited to automobiles, monitoring devices, smart phones, computers, smart watches, etc. By adding the imaging module provided by the present invention to the electronic device, the electronic device has the characteristics of high imaging clarity and a large field of view angle. Description of the Drawings

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0036] Figure 1 is a schematic structural diagram of the optical system of the first embodiment;

[0037] Figure 2 shows the longitudinal spherical aberration curve graph, astigmatism curve graph and distortion curve graph of the optical system of the first embodiment;

[0038] Figure 3 is a schematic structural diagram of the optical system of the second embodiment;

[0039] Figure 4 shows the longitudinal spherical aberration curve graph, astigmatism curve graph and distortion curve graph of the optical system of the second embodiment;

[0040] Figure 5 is a schematic structural diagram of the optical system of the third embodiment;

[0041] Figure 6 shows the longitudinal spherical aberration curve graph, astigmatism curve graph and distortion curve graph of the optical system of the third embodiment;

[0042] Figure 7 is a schematic structural diagram of the optical system of the fourth embodiment;

[0043] Figure 8 shows the longitudinal spherical aberration curve graph, astigmatism curve graph and distortion curve graph of the optical system of the fourth embodiment;

[0044] Figure 9 is a schematic structural diagram of the optical system of the fifth embodiment;

[0045] Figure 10 shows the longitudinal spherical aberration curve graph, astigmatism curve graph and distortion curve graph of the optical system of the fifth embodiment;

[0046] Figure 11 shows a schematic structural diagram of the camera module in an embodiment of the present invention;

[0047] Figure 12 shows a schematic structural diagram of the electronic device in an embodiment of the present invention. Detailed Embodiments

[0048] Next, in conjunction with the accompanying drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0049] In a first aspect, the present invention provides an optical system, which has a total of six lenses with refractive power. Along the optical axis, from the object side to the image side, it successively includes: a first lens with negative refractive power, the object side surface of the first lens is concave near the optical axis, and the image side surface of the first lens is convex near the optical axis; a second lens with positive refractive power, the object side surface of the second lens is convex near the optical axis, and the image side surface of the second lens is convex near the optical axis; a third lens with positive refractive power, the object side surface of the third lens is convex near the optical axis, and the image side surface of the third lens is convex near the optical axis; a fourth lens with 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 with 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 with 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.

[0050] The optical system satisfies the relationship: 30deg ≤ FOV ≤ 45deg, 5.2 ≤ TTL / IMGH ≤ 6.8; where, FOV is the maximum field of view angle of the optical system, TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, and IMGH is half of the image height corresponding to the maximum field of view angle of the optical system. Specifically, the value of FOV can be 40deg, 30deg, 45deg, 32deg, 38deg, 42deg, 43deg, 31deg, 35deg, etc. Specifically, the value of TTL / IMGH can be 5.208, 5.359, 6.586, 6.754, 5.873, 5.213, 6.792, 6.037, etc.

[0051] By making the first lens have a negative refractive power, with the object side of the first lens being concave near the optical axis and the image side of the first lens being convex near the optical axis, it is beneficial for the light to enter gently, preventing the light from bending too much, effectively reducing the field curvature and astigmatism of the optical system, and decreasing the overall sensitivity of the optical system; by making the second lens have a positive refractive power, with the object side of the second lens being convex near the optical axis and the image side of the second lens being convex near the optical axis, it is beneficial for initially correcting the astigmatism of the optical system and effectively controlling the trend of light, achieving a larger aperture; by making the third lens have a positive refractive power, with the object side of the third lens being convex near the optical axis and the image side of the third lens being convex near the optical axis, it is beneficial for 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 of the fourth lens being concave near the optical axis and the image side of the fourth lens being concave near the optical axis, it is beneficial for the marginal light to enter and be refracted, reducing the refraction angle borne by the subsequent lenses, making the refraction angles of the light on each lens relatively 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 of the optical system, 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 of the fifth lens being convex near the optical axis and the image side 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 of the sixth lens being concave near the optical axis and the image side of the sixth lens being 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, allowing more light to enter the optical system on the image side, and increasing the illuminance of the optical system.

[0052] By making the optical system satisfy the relationship: 30deg ≤ 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 sufficient field of view.

[0053] By making the optical system satisfy the relationship: 5.2 ≤ TTL / IMGH ≤ 6.8, the ratio of the total length to the image height of the optical system is reasonably configured. Combining with the above range of the maximum field of view angle of the optical system, it is beneficial for restricting the total length of the optical system and achieving the miniaturization of the optical system.

[0054] In one embodiment, the optical system satisfies the relation: 18deg ≤ FOV / FNO ≤ 27deg; where FNO is the f-number of the optical system. Specifically, the value of FOV / FNO can be 22.346deg, 23.669deg, 18.293deg, 18.634deg, 26.012deg, 20.823deg, 26.941deg, 24.276deg, 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, achieving the combined effect of the optical system having a large field of view angle and a large aperture, the optical system having a reasonable light input amount, improving the overall illuminance of the imaging picture, and making the optical system applicable to different lighting environments.

[0055] In one embodiment, the optical system satisfies the relation: 1.6 ≤ FNO ≤ 1.8. Specifically, the value of FNO can be 1.790, 1.690, 1.640, 1.610, 1.730, 1.620, 1.750, 1.770, etc. By making the optical system satisfy the above relation, the f-number of the optical system is set within a reasonable range, achieving the combined effect of the optical system having a large field of view angle and a large aperture, the optical system having a reasonable light input amount, improving the overall illuminance of the imaging picture, and making the optical system applicable to different lighting environments.

[0056] In one embodiment, the optical system satisfies the relation: 7.9mm ≤ TTL × IMGH / F ≤ 11mm; where F is the effective focal length of the optical system. Specifically, the value of TTL × IMGH / F can be 9.363mm, 8.891mm, 7.996mm, 8.056mm, 10.513mm, 7.910mm, 9.925mm, 10.802mm, etc. By making the optical system satisfy the above relation, the optical system can be adapted to a large-sized imaging surface, which is beneficial for the optical system to simultaneously meet the performance requirements of miniaturization and a large target surface.

[0057] In one embodiment, the optical system satisfies the relation: 0.19 ≤ (CT3 + CT4) / TTL ≤ 0.35; where CT3 is the thickness of the third lens on the optical axis, and CT4 is the thickness of the fourth lens on the optical axis. Specifically, the value of (CT3 + CT4) / TTL can be 0.252, 0.195, 0.334, 0.240, 0.301, 0.205, 0.348, 0.295, etc. By making the optical system satisfy the above relation, the central thickness of the cemented lens composed of the third lens and the fourth lens is reasonably configured, which is beneficial for enhancing the light control ability of the third lens and the fourth lens, facilitating more light to enter the optical system behind the fourth lens, and improving the relative illuminance of the optical system.

[0058] In one embodiment, the optical system satisfies the relation: 3 ≤ (CT2 + CT3) / CT23 ≤ 55; where CT2 is the thickness of the second lens on the optical axis, and CT23 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 (CT2 + CT3) / CT23 can be 31.268, 54.449, 5.769, 3.076, 33.850, 24.052, 44.295, 18.812, etc. By making the optical system satisfy the above relation, the thickness of the second lens on the optical axis and the thickness of the third lens on the optical axis are reasonably set, which is beneficial to simplifying the surface shape setting of the second lens and the third lens, enabling the second lens and the third lens to adjust each other and reduce aberration; at the same time, the distance between the second lens and the third lens on the optical axis is also reasonably set, which is beneficial to controlling the incident angle of light and maintaining the miniaturized characteristics of the optical system.

[0059] In one embodiment, the optical system satisfies the relation: 0.7 ≤ CT3 / CT4 ≤ 5.1. Specifically, the value of CT3 / CT4 can be 5.058, 3.900, 0.890, 1.566, 0.707, 2.622, 4.662, 0.962, etc. By making the optical system satisfy the above relation, the ratio of the thickness of the third lens on the optical axis to the thickness of the fourth lens on the optical axis is reasonably configured, and the third lens and the fourth lens can adjust each other to maintain the miniaturized characteristics of the optical system.

[0060] In one embodiment, the optical system satisfies the relation: 0.85 ≤ SD1 / IMGH ≤ 1.3; where SD1 is half of the maximum effective aperture of the object side of the first lens. Specifically, the value of SD1 / IMGH can be 0.943, 0.889, 1.222, 1.255, 0.945, 0.852, 1.062, 1.117, 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 image height corresponding to the maximum field of view angle of the optical system is reasonably configured, which is beneficial to reasonably controlling the size of the object side of the first lens and realizing the miniaturization of the optical system.

[0061] In one embodiment, the optical system satisfies the relation: 5.2 ≤ TTL / SDL1 ≤ 6.3; where SDL1 is half of the maximum effective aperture of the larger one of the object side and the image side of the first lens. Specifically, the value of TTL / SDL1 can be 5.525, 5.872, 5.302, 5.289, 6.217, 5.210, 5.963, 6.286, etc. By making the optical system satisfy the above relation, the ratio of the total length of the optical system to half of the maximum effective aperture of the larger one of the object side and the image side of the first lens is reasonably configured. When the total length of the optical system is fixed, the size of the first lens can be reasonably limited, which is beneficial to limiting the head size of the optical system and realizing the miniaturization of the optical system.

[0062] In one embodiment, the optical system satisfies the relation: 0.78 ≤ SD9 / SD1 ≤ 0.97; where SD9 is half of the maximum effective aperture of the object side of the fifth lens. Specifically, the value of SD9 / SD1 can be 0.963, 0.947, 0.783, 0.964, 0.906, 0.825, 0.791, 0.882, etc. By making the optical system satisfy the above relation, it is beneficial to reasonably configure 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 object side of the fifth lens, and further control the outer diameter size of the lens group in the optical system to reduce the thickness in the radial direction of the optical system, thereby meeting the requirement of miniaturizing the optical system.

[0063] In one embodiment, the optical system satisfies the relation: 0.9 ≤ F3 / F ≤ 1.2; where F3 is the effective focal length of the third lens and F is the effective focal length of the optical system. Specifically, the value of F3 / F can be 0.945, 0.921, 0.977, 1.108, 1.032, 0.901, 1.189, 1.068, etc. By making the optical system satisfy the above relation, it is beneficial for the refractive power of the third lens in the optical system to be properly matched. The surface type design of the third lens is more simple and flexible, reducing aberration and simplifying the overall aberration correction and imaging quality balance of the optical system.

[0064] In one embodiment, the optical system satisfies the relation: -10 ≤ F4 / CT4 ≤ -1.5; where F4 is the effective focal length of the fourth lens and CT4 is the thickness of the fourth lens on the optical axis. Specifically, the value of F4 / CT4 can be -7.859, -9.547, -1.972, -2.784, -1.716, -4.275, -6.934, -9.935, etc. By making the optical system satisfy the above relation, the ratio of the effective focal length of the fourth lens to the thickness of the fourth lens on the optical axis is reasonably configured, which is beneficial to simplifying the surface type setting of the fourth lens.

[0065] In one embodiment, the optical system satisfies the relation: -1.2 ≤ F / F34 ≤ -0.2; where F34 is the combined effective focal length of the third lens and the fourth lens. Specifically, the value of F / F34 can be -0.342, -0.222, -0.273, -1.086, -0.293, -1.162, -0.873, -0.588, etc. By making the optical system satisfy the above relation, the ratio of the effective focal length of the optical system to the effective focal length of the cemented lens formed by the third lens and the fourth lens is reasonably configured, which is beneficial to correcting chromatic aberration and balancing various aberrations, improving the resolution ability of the optical system, effectively reducing the tolerance sensitivity of the optical system, and thus improving the imaging quality of the optical system.

[0066] In one embodiment, the optical system satisfies the relation: -1.4 ≤ (VD3 - VD4) / F34 ≤ -0.35 ; where VD3 is the Abbe number of the third lens and VD4 is the Abbe number of the fourth lens. Specifically, the value of (VD3 - VD4) / F34 can be -0.664, -0.389, -0.512, -1.311, -0.596, -0.962, -1.173, -0.802, etc. By making the optical system satisfy the above relation, the ratio of the difference between the Abbe number of the third lens and the Abbe number of the fourth lens to the combined focal length of the third lens and the fourth lens is reasonably configured, which is beneficial to effectively correcting the chromatic aberration of the optical system and imaging to effectively restore the authenticity of colors, and thus improving the imaging quality of the optical system.

[0067] In one embodiment, the optical system satisfies the relation: 0.67 ≤ CT1 / ET1 ≤ 0.96; where CT1 is the thickness of the first lens on the optical axis and ET1 is the edge thickness of the first lens, that is, the distance in the direction parallel to the optical axis from the maximum effective aperture of the object side of the first lens to the maximum effective aperture of the image side. Specifically, the value of CT1 / ET1 can be 0.907, 0.956, 0.698, 0.736, 0.940, 0.677, 0.869, 0.793, etc. By making the optical system satisfy the above relation, the ratio of the thickness of the first lens on the optical axis to the edge thickness of the first lens is reasonably configured, which is beneficial to simplifying the production and manufacture of the first lens.

[0068] In one embodiment, the optical system satisfies the relation: 1.15 ≤ CT2 / ET2 ≤ 1.55; where CT2 is the thickness of the second lens on the optical axis, and ET2 is the edge thickness of the second lens, that is, the distance in the direction parallel to the optical axis from the maximum effective aperture of the object side of the second lens to the maximum effective aperture of the image side. Specifically, the value of CT2 / ET2 can be 1.335, 1.181, 1.328, 1.524, 1.386, 1.542, 1.274, 1.481, etc. By making the optical system satisfy the above relation, the ratio of the thickness of the second lens on the optical axis to the edge thickness of the second lens is reasonably configured, which is beneficial to simplifying the production and manufacturing of the second lens.

[0069] In one embodiment, the optical system satisfies the relation: -14 ≤ (F1 + F2) / F ≤ -1.5; where F1 is the effective focal length of the first lens, and F2 is the effective focal length of the second lens. Specifically, the value of (F1 + F2) / F can be -1.886, -13.550, -1.886, -2.592, -4.374, -10.452, -8.831, -11.176, etc. By making the optical system satisfy the above relation, the ratio of the sum of the effective focal lengths of the first lens and the second lens to the effective focal length of the optical system is reasonably configured, which is beneficial to the mutual correction of the aberrations generated by the first lens and the second lens, and further improves the imaging quality of the optical system.

[0070] In one embodiment, the optical system satisfies the relation: -2.5 ≤ SAG11 / CT6 ≤ -1; where SAG11 is the sagitta at the maximum effective aperture of the object side of the sixth lens, that is, the distance in the direction parallel to the optical axis from the intersection of the object side of the sixth lens and the optical axis to the maximum effective aperture of the object side of the sixth lens, and CT6 is the thickness of the sixth lens on the optical axis. Specifically, the value of SAG11 / CT6 can be -1.061, -1.080, -1.061, -1.050, -2.459, -1.526, -2.062, -2.396, etc. By making the optical system satisfy the above relation, it is beneficial to reasonably control the refractive power and thickness of the sixth lens at various positions perpendicular to the optical axis, avoid the sixth lens being too thick or too thin, reduce the incident angle of light on the object side of the sixth lens, and reduce the tolerance sensitivity of the optical system.

[0071] In one embodiment, the optical system satisfies the relation: 7 ≤ |SAG11 / SAG12| ≤ 31; where SAG12 is the sagitta at the maximum effective aperture of the image side of the sixth lens, that is, the distance from the intersection of the image side of the sixth lens and the optical axis to the maximum effective aperture of the image side of the sixth lens in the direction parallel to the optical axis. Specifically, the value of |SAG11 / SAG12| can be 11.460, 7.390, 23.296, 10.855, 30.204, 15.832, 19.583, 26.921, etc. By making the optical system satisfy the above relation, it is beneficial to reasonably control the shape of the sixth lens and correct the distortion and field curvature generated by the object side lens of the sixth lens.

[0072] In one embodiment, the optical system satisfies the relation: 0.25 ≤ CT6 / ET6 ≤ 0.55; where ET6 is the edge thickness of the sixth lens, that is, the distance from the maximum effective aperture of the object side of the sixth lens to the maximum effective aperture of the image side in the direction parallel to the optical axis. Specifically, the value of CT6 / ET6 can be 0.464, 0.449, 0.496, 0.512, 0.296, 0.253, 0.543, 0.338, etc. By making the optical system satisfy the above relation, the ratio of the thickness of the sixth lens on the optical axis to the edge thickness of the sixth lens is reasonably configured, which is beneficial to simplifying the production and manufacturing of the sixth lens.

[0073] In one embodiment, the optical system satisfies the relation: 1.1 ≤ |(R3 - R4) / (R3 + R4)| ≤ 6.3; where R3 is the radius of curvature of the object side of the second lens at the optical axis, and R4 is the radius of curvature of the image side of the second lens at the optical axis. Specifically, the value of |(R3 - R4) / (R3 + R4)| can be 1.160, 3.776, 3.884, 6.217, 5.756, 4.825, 2.982, 6.036, 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, reduce the risk of generating ghost images, and improve the resolution ability of the optical system.

[0074] In one embodiment, the optical system satisfies the relation: 8 ≤ |R12 / R11| ≤ 31; where R11 is the curvature radius of the object side surface of the sixth lens on the optical axis, and R12 is the curvature radius of the image side surface of the sixth lens on the optical axis. Specifically, the value of |R12 / R11| can be 12.762, 8.373, 24.726, 10.910, 30.802, 15.017, 22.982, 29.554, 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 surface of the sixth lens on the optical axis to the curvature radius of the image side surface of the sixth lens on the optical axis, control the shape of the sixth lens, comprehensively balance the spherical aberration, chromatic aberration and field curvature of the optical system, and reduce the risk of generating ghost images, improve the resolution ability of the optical system. At the same time, it is also beneficial to reduce the processing difficulty of the sixth lens.

[0075] In one embodiment, the optical system satisfies the relation: 4.5 ≤ |R12 / F| ≤ 19. Specifically, the value of |R12 / F| can be 8.523, 4.784, 12.257, 5.915, 18.283, 10.462, 14.982, 17.554, etc. By making the optical system satisfy the above relation, the ratio of the curvature radius of the image side surface of the sixth lens to the effective focal length of the optical system is rationally configured, which is beneficial to increasing the image height of the optical system on the premise of keeping the field of view angle unchanged, enabling the optical system to receive light at a larger angle, reducing the distortion of the optical system. At the same time, the turning angle of the light when it reaches the sixth lens is small, which is beneficial to reducing the tolerance sensitivity of the optical system.

[0076] In one embodiment, the optical system satisfies the relation: 1.75 ≤ TTL / F ≤ 2.4. Specifically, the value of TTL / F can be 2.060, 1.936, 1.797, 1.806, 2.376, 1.757, 2.282, 2.154, etc. By making the optical system satisfy the above relation, it is beneficial to rationally configure the ratio of the distance from the object side surface of the first lens to the imaging surface of the optical system on the optical axis to the effective focal length of the optical system, so that the optical system has a smaller overall optical length and realizes the characteristic of miniaturization.

[0077] In one embodiment, the optical system satisfies the relation: 2.45 ≤ F / IMGH ≤ 3.8. Specifically, the value of F / IMGH can be 2.528, 2.768, 3.666, 3.740, 2.472, 3.062, 2.982, 3.554, etc. By making the optical system satisfy the above relation, the refractive power of the optical system is matched with the image surface size, improving the imaging quality of the optical system.

[0078] In one embodiment, the optical system satisfies the relation: 101 ≤ FOV × F / IMGH ≤ 113. Specifically, the value of FOV × F / IMGH can be 101.122, 110.714, 109.978, 112.214, 111.247, 104.521, 106.622, 107.623, etc. By making the optical system satisfy the above relation, it is beneficial to achieve the effect of a large image height while having a large field of view angle, thereby facilitating the matching with a larger-sized photosensitive chip and improving the imaging quality of the optical system.

[0079] In one embodiment, the optical system satisfies the relation: -15 ≤ F1 / F ≤ -2.5. Specifically, the value of F1 / F can be -2.896, -14.494, -2.806, -3.528, -5.327, -13.017, -8.982, -10.554, etc. By making the optical system satisfy the above relation, it is beneficial for the refractive power of the first lens in the optical system to be properly matched, the surface shape design of the first lens to be more simple and flexible, enabling the first lens to support a large field of view angle and a large aperture; at the same time, it is also beneficial to converge the light rays incident on the optical system from the first lens, delay the incident angle of the light rays, reduce aberration, and simplify the aberration correction of the overall optical system and the balance of imaging quality.

[0080] In one embodiment, the optical system satisfies the relation: 0.9 ≤ F2 / F ≤ 1.1. Specifically, the value of F2 / F can be 1.010, 0.944, 0.920, 0.936, 0.953, 1.087, 1.032, 1.054, etc. By making the optical system satisfy the above relation, it is beneficial for the refractive power of the second lens in the optical system to be properly matched, the surface shape design of the second lens to be more simple and flexible, reduce aberration, and simplify the aberration correction of the overall optical system and the balance of imaging quality.

[0081] In one embodiment, the optical system satisfies the relation: -0.75 ≤ F4 / F ≤ -0.45. Specifically, the value of F4 / F can be -0.675, -0.737, -0.625, -0.471, -0.719, -0.517, -0.582, -0.454, etc. By making the optical system satisfy the above relation, it is beneficial for the refractive power of the fourth lens in the optical system to be properly matched, the surface shape design of the fourth lens to be more simple and flexible, reduce aberration, and simplify the aberration correction of the overall optical system and the balance of imaging quality.

[0082] In one embodiment, the optical system satisfies the relationship: 0.6 ≤ F5 / F ≤ 1.9; where F5 is the effective focal length of the fifth lens. Specifically, the value of F5 / F can be 1.069, 1.879, 1.208, 0.633, 1.604, 0.745, 0.976, 1.592, etc. By making the optical system satisfy the above relationship, it is beneficial for the refractive power of the fifth lens to be properly matched in the optical system, the surface shape design of the fifth lens to be more simple and flexible, reduce aberration, simplify the aberration correction of the overall optical system and the balance of imaging quality.

[0083] In one embodiment, the optical system satisfies the relationship: -1 ≤ F6 / F ≤ -0.75; where F6 is the effective focal length of the sixth lens. Specifically, the value of F6 / F can be -0.989, -0.813, -0.789, -0.864, -0.984, -0.753, -0.852, -0.905, etc. By making the optical system satisfy the above relationship, it is beneficial for the refractive power of the sixth lens to be properly matched in the optical system, the surface shape design of the sixth lens to be more simple and flexible, reduce aberration, simplify the aberration correction of the overall optical system and the balance of imaging quality.

[0084] In one embodiment, the optical system satisfies the relationship: 0.15 ≤ R1 / R2 ≤ 0.9; where R1 is the curvature radius of the object side of the first lens at the optical axis, and R2 is the curvature radius of the image side of the first lens at the optical axis. Specifically, the value of R1 / R2 can be 0.165, 0.883, 0.628, 0.708, 0.640, 0.256, 0.489, 0.794, etc. By making the optical system satisfy the above relationship, it is beneficial to reasonably configure the ratio of the curvature radius of the object side of the first lens at the optical axis to the curvature radius of the image side of the first lens at the optical axis, control the shape of the first lens, comprehensively balance the spherical aberration, chromatic aberration and field curvature of the optical system, and reduce the risk of generating ghost images, improve the resolution ability of the optical system. At the same time, it is also beneficial to reduce the processing difficulty of the first lens.

[0085] In one embodiment, the optical system satisfies the relationship: -2 ≤ R3 / R4 ≤ 0; 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 -0.074, -1.720, -0.591, -0.723, -1.421, -0.215, -1.052, -1.932, etc. By making the optical system satisfy the above relationship, it is beneficial to rationally configure the ratio of the curvature radius of the object side surface of the second lens on the optical axis to the curvature radius of the image side surface of the second lens on the optical axis, control the shape of the second lens, comprehensively balance the spherical aberration, chromatic aberration and field curvature of the optical system, reduce the risk of ghosting, improve the resolution ability of the optical system, and at the same time, it is also beneficial to reduce the processing difficulty of the second lens.

[0086] In one embodiment, the optical system satisfies the relationship: -14 ≤ R5 / R6 ≤ -0.9; 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. Specifically, the value of R5 / R6 can be -6.828, -7.982, -0.991, -13.390, -10.852, -1.017, -3.982, -12.554, etc. By making the optical system satisfy the above relationship, it is beneficial to rationally configure the ratio of the curvature radius of the object side surface of the third lens on the optical axis to the curvature radius of the image side surface of the third lens on the optical axis, control the shape of the third lens, comprehensively balance the spherical aberration, chromatic aberration and field curvature of the optical system, reduce the risk of ghosting, improve the resolution ability of the optical system, and at the same time, it is also beneficial to reduce the processing difficulty of the third lens.

[0087] In one embodiment, the optical system satisfies the relationship: -1.7 ≤ R7 / R8 ≤ -0.45; 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. Specifically, the value of R7 / R8 can be -0.648, -0.467, -1.252, -1.678, -0.553, -1.017, -0.982, -1.554, etc. By making the optical system satisfy the above relationship, it is beneficial to rationally configure the ratio of the curvature radius of the object side surface of the 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.

[0088] In one embodiment, the optical system satisfies the relation: -6 ≤ R9 / R10 ≤ 0; where R9 is the radius of curvature of the object side surface of the fifth lens at the optical axis, and R10 is the radius of curvature of the image side surface of the fifth lens at the optical axis. Specifically, the value of R9 / R10 can be -2.060, -1.000, -0.365, -0.045, -5.821, -4.017, -3.982, -2.554, etc. By making the optical system satisfy the above relation, it is beneficial to rationally configure the ratio of the radius of curvature of the object side surface of the fifth lens at the optical axis to the radius of curvature of the image side surface of the fifth lens at the optical axis, control the shape of the fifth lens, comprehensively balance the spherical aberration, chromatic aberration and field curvature of the optical system, and reduce the risk of ghosting, improve the resolution ability of the optical system. At the same time, it is also beneficial to reduce the processing difficulty of the fifth lens.

[0089] 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 dual-pass 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 relatively fixedly arranged with 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 dual-pass filter can also be selected as the filter, that is, it can simultaneously transmit visible light and part of infrared light with high transmittance, so as to achieve different wavelength band selections, and can realize both visible light imaging and infrared imaging, so as to achieve day and night use. The filter can be assembled with each lens to be a part of the optical system. In some other embodiments, the filter can also be an element independent of the optical system. The filter can be installed between the optical system and the photosensitive chip when the optical system and the photosensitive chip are assembled. It can be understood that the filter can be made of optical glass coating, or colored glass, or filters of other materials, and can be selected according to actual needs, and is not specifically limited in this embodiment. In some other embodiments, the function of filtering light can also be achieved by setting a filter coating on at least one of the first lens to the fifth lens.

[0090] 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 manufacturing difficulty of the lens 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 and image side 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, manufacturing difficulty, imaging quality, assembly difficulty, etc., the design of the surfaces of each lens 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.

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

[0092] First Embodiment

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

[0094] The first lens L1 has a negative refractive power. The object side surface S1 of the first lens L1 is concave near the optical axis, and the image side surface S2 is convex near the optical axis.

[0095] The second lens L2 has a positive refractive power. The object side surface S3 of the second lens L2 is convex near the optical axis, and the image side surface S4 is convex near the optical axis.

[0096] The third lens L3 has a positive refractive power. The object side surface S5 of the third lens L3 is convex near the optical axis, and the image side surface S6 is convex near the optical axis.

[0097] The fourth lens L4 has a 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.

[0098] 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.

[0099] 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.

[0100] 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 amount of incident light. 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 380nm - 780nm. The material of the infrared cut-off filter can be glass or plastic, and a film can be coated 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 the object for subsequent processing.

[0101] 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 respectively the object side surface S1 and the image side surface S2 of the first lens L1. 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 546nm. The units of the Y radius, thickness, and effective focal length are all millimeters (mm);

[0102] Table 1a

[0103]

[0104] 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.

[0105] In this embodiment, both the object side surface and the image side surface of the second lens L2 are aspherical surfaces, and the surface profile x of the aspherical surface can be defined by, but not limited to, the following aspherical formula:

[0106]

[0107] 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.

[0108] 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;

[0109] Table 1b

[0110]

[0111] Figure 2 In (a) shows the longitudinal spherical aberration curves of the optical system 10 of the first embodiment at wavelengths of 656.0000 nm, 588.0000 nm, 546.0000 nm, 486.0000 nm, and 436.0000 nm. Among them, the abscissa along the X-axis direction represents the focus shift, that is, the distance from the imaging surface to the intersection 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 It can be seen from (a) that 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.

[0112] Figure 2 In (b) also shows the astigmatism curve of the optical system 10 of the first embodiment at a wavelength of 546.0000 nm. Among them, the abscissa along the X-axis direction represents the focus shift, and the ordinate along the Y-axis direction represents the field of view angle, and its unit is deg. The S curve in the astigmatism curve represents the sagittal field curvature at 546.0000 nm, and the T curve represents the meridional field curvature at 546.0000 nm. From Figure 2As can be seen from Fig. (b), the Petzval field of the optical system 10 is small, the Petzval field and astigmatism of each field of view are well corrected, and clear images are obtained both at the center and edges of the field of view.

[0113] Figure 2 Fig. (c) also shows the distortion curve of the optical system 10 of the first embodiment at a wavelength of 546.0000 nm. Among them, the abscissa along the X-axis represents the distortion value in %, and the ordinate along the Y-axis represents the field angle in 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 546.0000 nm, the image deformation caused by the chief ray is small, and the imaging quality of the system is excellent.

[0114] 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.

[0115] Second Embodiment

[0116] 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:

[0117] The first lens L1 has a negative refractive power. The object surface S1 of the first lens L1 is concave near the optical axis, and the image surface S2 is convex near the optical axis.

[0118] The second lens L2 has a positive refractive power. The object surface S3 of the second lens L2 is convex near the optical axis, and the image surface S4 is convex near the optical axis.

[0119] The third lens L3 has a positive refractive power. The object surface S5 of the third lens L3 is convex near the optical axis, and the image surface S6 is convex near the optical axis.

[0120] The fourth lens L4 has a negative refractive power. The object surface S7 of the fourth lens L4 is concave near the optical axis, and the image surface S8 is concave near the optical axis.

[0121] The fifth lens L5 has a positive refractive power. The object surface S9 of the fifth lens L5 is convex near the optical axis, and the image surface S10 is convex near the optical axis.

[0122] The sixth lens L6 has a negative refractive power. The object surface S11 of the sixth lens L6 is concave near the optical axis, and the image surface S12 is concave near the optical axis.

[0123] The other structures of the second embodiment are the same as those of the first embodiment and can be referred to.

[0124] 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 546 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;

[0125] Table 2a

[0126]

[0127] 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;

[0128] Table 2b

[0129]

[0130] Figure 4 in (a), Figure 4 in (b), Figure 4 in (c) respectively show the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system 10 of the second embodiment. Among them, the longitudinal spherical aberration curve represents the deviation of the convergence focal points of light rays of different wavelengths after passing through each lens of the optical system 10; the astigmatism curve represents the meridional field curvature and sagittal field curvature; the distortion curve represents the distortion magnitude values corresponding to different field angles. From Figure 4 the aberration diagram in it, it can be seen that the longitudinal spherical aberration, field curvature, and distortion of the optical system 10 are all well controlled, so that the optical system 10 of this embodiment has good imaging quality.

[0131] Third Embodiment

[0132] Please refer to Figure 5 , the optical system 10 of this embodiment sequentially includes, from the object side to the image side along the optical axis direction:

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

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

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

[0136] The fourth lens L4 has a 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.

[0137] 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.

[0138] 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.

[0139] The other structures of the third embodiment are the same as those of the first embodiment, and can be referred to.

[0140] 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 546 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;

[0141] Table 3a

[0142]

[0143] 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;

[0144] Table 3b

[0145]

[0146] Figure 6 In (a), Figure 6 In (b), Figure 6 In (c) respectively show the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system 10 of the third embodiment. Among them, the longitudinal spherical aberration curve represents the deviation of the convergence focal points of light rays of different wavelengths after passing through the lenses of the optical system 10; the astigmatism curve represents the meridional field curvature and sagittal field curvature; the distortion curve represents the distortion magnitude values corresponding to different field angles. From Figure 6 the aberration diagrams in it, it can be seen that the longitudinal spherical aberration, field curvature, and distortion of the optical system 10 are all well controlled, so that the optical system 10 of this embodiment has good imaging quality.

[0147] Fourth Embodiment

[0148] 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:

[0149] 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.

[0150] 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.

[0151] 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.

[0152] 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.

[0153] 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.

[0154] 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.

[0155] The other structures of the fourth embodiment are the same as those of the first embodiment, and can be referred to.

[0156] Table 4a shows the parameters of the optical system 10 of this embodiment. Among them, the focal length, material refractive index, and Abbe number are all obtained with visible light having a reference wavelength of 546 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;

[0157] Table 4a

[0158]

[0159] 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;

[0160] Table 4b

[0161]

[0162] 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 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 that the optical system 10 of this embodiment has good imaging quality.

[0163] The Fifth Embodiment

[0164] 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:

[0165] The first lens L1, having 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.

[0166] The second lens L2, having 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.

[0167] The third lens L3, having 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.

[0168] The fourth lens L4, having 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.

[0169] The fifth lens L5, having 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.

[0170] The sixth lens L6, having 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.

[0171] The other structures of the fifth embodiment are the same as those of the first embodiment, and can be referred to accordingly.

[0172] 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 546 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;

[0173] Table 5a

[0174]

[0175] 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;

[0176] Table 5b

[0177]

[0178] Figure 10 in (a), Figure 10 in (b), Figure 10 and in (c) respectively show the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system 10 of the fifth embodiment. Among them, the longitudinal spherical aberration curve represents the deviation of the converging focal points of light rays of different wavelengths after passing through each lens of the optical system 10; the astigmatism curve represents the meridional field curvature and sagittal field curvature; the distortion curve represents the distortion magnitude values corresponding to different field angles. From Figure 10 the aberration diagram in, it can be seen that the longitudinal spherical aberration, field curvature and distortion of the optical system 10 are all well controlled, so that the optical system 10 of this embodiment has good imaging quality.

[0179] Table 6 shows the values of FOV, TTL / IMGH, FOV / FNO, FNO, TTL×IMGH / F, (CT3+CT4) / TTL, (CT2+CT3) / CT23, CT3 / CT4, SD1 / IMGH, TTL / SDL1, SD9 / SD1, F3 / F, F4 / CT4, F / F34, (VD3-VD4) / F34, CT1 / ET1, CT2 / ET2, (F1+F2) / F, SAG11 / CT6, |SAG11 / SAG12|, CT6 / ET6, |(R3-R4) / (R3+R4)|, |R12 / R11|, |R12 / F|, TTL / F, F / IMGH, FOV×F / IMGH, F1 / F, F2 / F, F4 / F, F5 / F, F6 / F, R1 / R2, R3 / R4, R5 / R6, R7 / R8 and R9 / R10 in the optical systems 10 of the first to fifth embodiments;

[0180] Table 6

[0181]

[0182] As can be seen from Table 6, the optical systems of the first to fifth embodiments all satisfy the following relationships: 30deg ≤ FOV ≤ 45deg, 5.2 ≤ TTL / IMGH ≤ 6.8, 18deg ≤ FOV / FNO ≤ 27deg, 1.6 ≤ FNO ≤ 1.8, 7.9mm ≤ TTL×IMGH / F ≤ 11mm, 0.19 ≤ (CT3 + CT4) / TTL ≤ 0.35, 3 ≤ (CT2 + CT3) / CT23 ≤ 55, 0.7 ≤ CT3 / CT4 ≤ 5.1, 0.85 ≤ SD1 / IMGH ≤ 1.3, 5.2 ≤ TTL / SDL1 ≤ 6.3, 0.78 ≤ SD9 / SD1 ≤ 0.97, 0.9 ≤ F3 / F ≤ 1.2, -10 ≤ F4 / CT4 ≤ -1.5, -1.2 ≤ F / F34 ≤ -0.2, -1.4 ≤ (VD3 - VD4) / F34 ≤ -0.35 、0.67 ≤ CT1 / ET1 ≤ 0.96, 1.15 ≤ CT2 / ET2 ≤ 1.55, -14 ≤ (F1 + F2) / F ≤ -1.5, -2.5 ≤ SAG11 / CT6 ≤ -1, 7 ≤ |SAG11 / SAG12| ≤ 31, 0.25 ≤ CT6 / ET6 ≤ 0.55, 1.1 ≤ |(R3 - R4) / (R3 + R4)| ≤ 6.3, 8 ≤ |R12 / R11| ≤ 31, 4.5 ≤ |R12 / F| ≤ 19, 1.75 ≤ TTL / F ≤ 2.4, 2.45 ≤ F / IMGH ≤ 3.8, 101 ≤ FOV×F / IMGH ≤ 113, -15 ≤ F1 / F ≤ -2.5, 0.9 ≤ F2 / F ≤ 1.1, -0.75 ≤ F4 / F ≤ -0.45, 0.6 ≤ F5 / F ≤ 1.9, -1 ≤ F6 / F ≤ -0.75, 0.15 ≤ R1 / R2 ≤ 0.9, -2 ≤ R3 / R4 ≤ 0, -14 ≤ R5 / R6 ≤ -0.9, -1.7 ≤ R7 / R8 ≤ -0.45 and -6 ≤ R9 / R10 ≤ 0 values.

[0183] Please refer to Figure 11, the present invention also provides an imaging module 20, which includes an image sensor chip 21 and the optical system 10 described in any of the above embodiments. The image sensor chip 21 is disposed on the image side of the optical system 10. Among them, the photosensitive surface of the image sensor chip 21 is located on the imaging surface of the optical system 10, and the light of the object incident on the photosensitive surface through the lens can be converted into an electrical signal of an image. The image sensor chip 21 can be a Complementary Metal Oxide Semiconductor (CMOS) or a Charge-coupled Device (CCD). The imaging module 20 can be an imaging module integrated on an electronic device 30 or an independent lens. By adding the optical system 10 provided by the present invention to the imaging module 20, it is possible to reasonably design the surface shape and refractive power of each lens in the optical system 10, so that the imaging module 20 has the characteristics of miniaturization, high imaging clarity, and a large field of view.

[0184] Please refer to Figure 12 , the present invention also provides an electronic device 30, which includes a housing 31 and the above imaging module 20. The imaging module 20 is disposed in the housing 31. The electronic device 30 includes, but is not limited to, an automobile, a monitoring device, a smart phone, a computer, a smart watch, etc. By adding the imaging module 20 provided by the present invention to the electronic device 30, the electronic device 30 has the characteristics of miniaturization, high imaging clarity, and a large field of view.

[0185] The above-disclosed are only some preferred embodiments of the present invention. Of course, the scope of the rights of the present invention cannot be limited thereby. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. An optical system, characterized in that, There are a total of six lenses with refractive power, which successively include, from the object side to the image side along the optical axis: The first lens, which has negative refractive power, the object side surface of the first lens is concave near the optical axis, and the image side surface of the first lens is convex near the optical axis; The second lens, which has positive refractive power, the object side surface of the second lens is convex near the optical axis, and the image side surface of the second lens is convex near the optical axis; The third lens, which has positive refractive power, the object side surface of the third lens is convex near the optical axis, and the image side surface of the third lens is convex near the optical axis; The fourth lens, which has 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, which has 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, which has negative refractive power, the object side surface of the sixth lens is concave near the optical axis; The optical system satisfies the relational expressions: 30deg ≤ FOV ≤ 45deg, 5.2 ≤ TTL / IMGH ≤ 6.8; Wherein, FOV is the maximum field of view angle of the optical system, TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, and IMGH is half of the image height corresponding to the maximum field of view angle of the optical system.

2. The optical system according to claim 1, characterized in that, The optical system satisfies the relational expressions: 18deg ≤ FOV / FNO ≤ 27deg; and / or, 1.6 ≤ FNO ≤ 1.8; and / or, 7.9mm ≤ TTL×IMGH / F ≤ 11mm; Wherein, FNO is the f-number of the optical system, and F is the effective focal length of the optical system.

3. The optical system according to claim 1, characterized in that, The optical system satisfies the relational expressions: 0.19 ≤ (CT3 + CT4) / TTL ≤ 0.35; and / or, 3 ≤ (CT2 + CT3) / CT23 ≤ 55; and / or, 0.7 ≤ CT3 / CT4 ≤ 5.1; Wherein, CT3 is the thickness of the third lens on the optical axis, CT4 is the thickness of the fourth lens on the optical axis, CT2 is the thickness of the second lens on the optical axis, and CT23 is the distance on the optical axis from the image side surface of the second lens to the object side surface of the third lens.

4. The optical system according to claim 1, characterized in that, The optical system satisfies the relational expressions: 0.85 ≤ SD1 / IMGH ≤ 1.3; and / or, 5.2 ≤ TTL / SDL1 ≤ 6.3; and / or, 0.78 ≤ SD9 / SD1 ≤ 0.97; Wherein, SD1 is half of the maximum effective aperture of the object side surface of the first lens, SDL1 is half of the larger maximum effective aperture of the object side surface and the image side surface of the first lens, and SD9 is half of the maximum effective aperture of the object side surface of the fifth lens.

5. The optical system according to claim 1, wherein The optical system satisfies the relational expressions: 0.9 ≤ F3 / F ≤ 1.2; and / or, -10 ≤ F4 / CT4 ≤ -1.5; and / or, -1.2 ≤ F / F34 ≤ -0.2; and / or, -1.4 ≤(VD3 - VD4) / F34 ≤ -0.35 ; Wherein, F3 is the effective focal length of the third lens, F is the effective focal length of the optical system, F4 is the effective focal length of the fourth lens, CT4 is the thickness of the fourth lens on the optical axis, F34 is the combined effective focal length of the third lens and the fourth lens, VD3 is the Abbe number of the third lens, and VD4 is the Abbe number of the fourth lens.

6. The optical system according to claim 1, wherein The optical system satisfies the relational expressions: 0.67 ≤ CT1 / ET1 ≤ 0.96; and / or, 1.15 ≤ CT2 / ET2 ≤ 1.55; and / or, -14 ≤ (F1 + F2) / F ≤ -1.5; Wherein, CT1 is the thickness of the first lens on the optical axis, ET1 is the edge thickness of the first lens, CT2 is the thickness of the second lens on the optical axis, ET2 is the edge thickness of the second lens, F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, and F is the effective focal length of the optical system.

7. The optical system according to claim 1, wherein, The optical system satisfies the relational expressions: -2.5 ≤ SAG11 / CT6 ≤ -1; and / or, 7 ≤ |SAG11 / SAG12| ≤ 31; and / or, 0.25 ≤ CT6 / ET6 ≤ 0.55; Wherein, SAG11 is the sagitta at the maximum effective aperture of the object side of the sixth lens, CT6 is the thickness of the sixth lens on the optical axis, SAG12 is the sagitta at the maximum effective aperture of the image side of the sixth lens, and ET6 is the edge thickness of the sixth lens.

8. The optical system according to claim 1, wherein The optical system satisfies the relational expressions: 1.1 ≤ |(R3 - R4) / (R3 + R4)| ≤ 6.3; and / or, 8 ≤ |R12 / R11| ≤ 31; and / or, 4.5 ≤ |R12 / F| ≤ 19; Wherein, R3 is the radius of curvature at the optical axis of the object side of the second lens, R4 is the radius of curvature at the optical axis of the image side of the second lens, R11 is the radius of curvature at the optical axis of the object side of the sixth lens, R12 is the radius of curvature at the optical axis of the image side of the sixth lens, and F is the effective focal length of the optical system.

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