Optical system, camera module and electronic device

Abstract

An optical system, a camera module and an electronic device, the optical system having six lenses with refractive power, the optical system comprising, in order from an object side to an image side along an optical axis: a first lens and a fifth lens with positive refractive power, a second lens, a fourth lens and a sixth lens with negative refractive power; the object side surface and the image side surface of the first lens, the object side surface of the third lens, the image side surface of the fourth lens, the object side surface of the fifth lens and the object side surface of the sixth lens are all convex at a near optical axis, and the image side surface of the second lens, the image side surface of the third lens, the object side surface of the fourth lens and the image side surface of the sixth lens are all concave at the near optical axis, through reasonable design of the lenses of the optical system, the optical system is conducive to meeting large aperture, miniaturization and good imaging effect.

Description

Technical Field

[0001] This invention belongs to the field of optical imaging technology, and particularly relates to an optical system, a camera module, and an electronic device. Background Technology

[0002] In recent years, electronic devices equipped with cameras have developed rapidly, including smartphones, digital cameras, laptops, tablets, and other portable information terminals. People's demands for image quality are also increasing. In order to provide users with a better photography experience, optical systems are required to have higher resolution and image quality. At the same time, they also need to adapt to shooting needs in various environments, such as shooting in low-light environments such as night scenes, rainy days, and starry skies.

[0003] However, it is usually necessary to increase the number of lenses to achieve higher resolution, which leads to an increase in the overall length of the optical system. Increasing the amount of light entering the optical system can meet the shooting needs in various environments, which requires increasing the aperture of the optical system, making the structure of the optical system more complex. Ultimately, this leads to an increase in the size and overall length of the camera module, making it difficult to use in thin and light electronic products. Summary of the Invention

[0004] The purpose of this invention is to provide an optical system, camera module, and electronic device that address the need for an optical system to meet the requirements of large aperture, miniaturization, and good imaging performance.

[0005] To achieve the objectives of this invention, the following technical solution is provided:

[0006] In a first aspect, the present invention provides an optical system comprising six lenses with refractive power, arranged sequentially along the optical axis from the object side to the image side: a first lens having positive refractive power, wherein both the object-side and image-side surfaces of the first lens are convex near the optical axis; a second lens having negative refractive power, wherein the image-side surface of the second lens is concave near the optical axis; a third lens having refractive power, wherein the object-side surface of the third lens is convex near the optical axis, and the image-side surface of the third lens is concave near the optical axis; a fourth lens having negative refractive power, wherein the object-side surface of the fourth lens is concave near the optical axis, and the image-side surface of the fourth lens is convex near the optical axis; a fifth lens having positive refractive power, wherein the object-side surface of the fifth lens is convex near the optical axis; and a sixth lens having negative refractive power, wherein the object-side surface of the sixth lens is convex near the optical axis, and the image-side surface of the sixth lens is concave near the optical axis.

[0007] The optical system satisfies the following relationships: 1.9 < FNO < 2.3, 85deg < FOV < 100deg, 1.1 < TTL / ImgH < 1.4, where FNO is the f-number of the optical system, FOV is the maximum field angle of the optical system, and ImgH is half of the image height corresponding to the maximum field angle of the optical system.

[0008] By making the first lens have positive refractive power and both the object side and the image side of the first lens be convex near the optical axis, it is beneficial to shorten the overall optical length of the optical system, compress the light path of each field, reduce spherical aberration, and meet the requirements of high image quality and miniaturization of the optical system; at the same time, it is also beneficial to enhance the positive refractive power of the first lens and further provide a reasonable light incident angle for the introduction of marginal rays; by making the second lens have negative refractive power and the image side of the second lens be concave near the optical axis, it is beneficial for marginal rays to enter and be deflected, which can reduce the deflection angle borne by the subsequent lenses, making the deflection angles of light on each lens more uniform and effectively correcting the aberration of the marginal field; by making the third lens have refractive power and the object side of the third lens be convex near the optical axis and the image side of the third lens be concave near the optical axis, it is beneficial to delay the light rays incident from the front lens into the system and the delay angle; by making the fourth lens have negative refractive power, the object side of the fourth lens be concave near the optical axis, and the image side of the fourth lens be convex near the optical axis, it is beneficial to correct the spherical aberration, coma, and distortion generated by the first lens, the second lens, and the third lens; by making the fifth lens have positive refractive power and the object side of the fifth lens be convex near the optical axis, it is beneficial to reasonably constrain the curvature radius of the fifth lens, reduce the tolerance sensitivity of the optical system and the risk of generating stray light; by making the sixth lens have negative refractive power, the object side of the sixth lens be convex near the optical axis, and the image side of the sixth lens be concave near the optical axis, it is beneficial to shorten the overall length of the optical system, correct aberration, and at the same time, it can also increase the exit angle of light, making the optical system have the characteristics of a large image plane, improving the resolution of the optical system, and enabling the optical system to have better imaging quality.

[0009] By making the optical system satisfy the relationship: 1.9 < FNO < 2.3, the optical system has the characteristic of a large aperture, and the optical system has sufficient light input, which can make the images taken by the optical system clearer and is suitable for photographing object space scenes with low light brightness such as high-quality night scenes and starry skies.

[0010] By making the optical system satisfy the relationship: 85deg < FOV < 100deg, the optical system has the characteristic of a large field angle, so that the optical system has the characteristics of high pixels and high definition.

[0011] By making the optical system satisfy the relationship: 1.1 < TTL / ImgH < 1.4, the total optical length of the optical system is smaller, which is beneficial for the optical system to have an ultra-thin characteristic, meet the requirements of miniaturization of the optical system, and has more advantages when shooting scenes with medium focal length object distances.

[0012] In a second aspect, the present invention further provides an imaging module, which includes a photosensitive chip and the optical system according to any one of the embodiments of the first aspect, and the photosensitive chip is disposed 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 reasonably design the surface shape and refractive power of each lens in the optical system, so that the imaging module meets the requirements of large aperture, miniaturization and good imaging effect.

[0013] In a third aspect, the present invention further provides an electronic device, which includes a housing and the imaging module according to the second aspect, and the imaging module is disposed in the housing. The electronic device includes but is not limited to automobiles, surveillance, smart phones, computers, smart watches, etc. By adding the imaging module provided by the present invention to the electronic device, the electronic device meets the requirements of large aperture, miniaturization and good imaging effect. Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0015] Figure 1a is a schematic structural diagram of the optical system of the first embodiment;

[0016] Figure 1b shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the first embodiment;

[0017] Figure 2a is a schematic structural diagram of the optical system of the second embodiment;

[0018] Figure 2bThe longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system of the second embodiment are shown.

[0019] Figure 3a This is a schematic diagram of the optical system of the third embodiment;

[0020] Figure 3b The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system of the third embodiment are shown.

[0021] Figure 4a This is a schematic diagram of the optical system of the fourth embodiment;

[0022] Figure 4b The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system of the fourth embodiment are shown.

[0023] Figure 5a This is a schematic diagram of the optical system of the fifth embodiment;

[0024] Figure 5b The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system of the fifth embodiment are shown.

[0025] Figure 6a This is a schematic diagram of the optical system in the sixth embodiment;

[0026] Figure 6b The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system of the sixth embodiment are shown.

[0027] Figure 7 A schematic diagram of the camera module structure in one embodiment of the present invention is shown;

[0028] Figure 8 A schematic diagram of the structure of an electronic device according to one embodiment of the present invention is shown. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] In a first aspect, the present invention provides an optical system, which has six lenses with refractive power. Along the optical axis, from the object side to the image side, it successively includes: a first lens with positive refractive power, the object side surface and the image side surface of the first lens are both convex near the optical axis; a second lens with negative refractive power, the image side surface of the second lens is concave near the optical axis; a third lens with 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 concave 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 convex 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; a sixth lens with negative refractive power, the object side surface of the sixth lens is convex near the optical axis, and the image side surface of the sixth lens is concave near the optical axis. <**********>The optical system satisfies the relation: 1.9 < FNO < 2.3; further, the optical system satisfies the relation: 2 < FNO < 2.2. Here, FNO is the f-number of the optical system.

[0032] The optical system satisfies the relation: 85deg < FOV < 100deg, further, the optical system satisfies the relation: 87deg < FOV < 95deg. Here, FOV is the maximum field angle of the optical system.

[0033] The optical system satisfies the relation: 1.1 < TTL / ImgH < 1.4, further, the optical system satisfies the relation: < 1.2 < TTL / ImgH < 1.35. Here, ImgH is half of the image height corresponding to the maximum field angle of the optical system.

[0034] It should be noted that there seems to be an error in the original text for the relation in where the correct relation should be "1.2 < TTL / ImgH < 1.35" instead of "< 1.2 < TTL / ImgH < 1.35". The translation is based on the corrected relation. Also, the "<**********>" in seems to be an incorrect tag and should be the correct "

[0031] ". The above translation has made corresponding corrections.By making the first lens have a positive refractive power, and both the object side and the image side of the first lens are convex near the optical axis, it is beneficial to shorten the overall optical length of the optical system, compress the light path of each field of view, reduce spherical aberration, and meet the requirements of high image quality and miniaturization of the optical system; at the same time, it is also beneficial to enhance the positive refractive power of the first lens and further provide a reasonable light incident angle for the introduction of marginal rays; by making the second lens have a negative refractive power, and the image side of the second lens is concave near the optical axis, it is beneficial for marginal rays to enter and be refracted, which can reduce the refraction angle borne by the subsequent lenses, making the refraction angles of light on each lens more uniform and effectively correcting the aberration of the marginal field of view; by making the third lens have a refractive power, and the object side of the third lens is convex near the optical axis, and the image side of the third lens is concave near the optical axis, it is beneficial to delay the light entering the system from the front lens and delay the angle; by making the fourth lens have a negative refractive power, the object side of the fourth lens is concave near the optical axis, and the image side of the fourth lens is convex near the optical axis, it is beneficial to correct the spherical aberration, coma and distortion generated by the first lens, the second lens and the third lens; by making the fifth lens have a positive refractive power, and the object side of the fifth lens is convex near the optical axis, it is beneficial to reasonably restrict the radius of curvature of the fifth lens, reduce the tolerance sensitivity of the optical system and the risk of generating stray light; by making the sixth lens have a negative refractive power, the object side of the sixth lens is convex near the optical axis, and the image side of the sixth lens is concave near the optical axis, it is beneficial to shorten the overall length of the optical system, correct aberration, and at the same time, it can also increase the light exit angle, making the optical system have the characteristics of a large image plane, improving the resolution of the optical system, and making the optical system have better imaging quality.

[0035] By making the optical system satisfy the relationship: 1.9 < FNO < 2.3, the optical system has the characteristic of a large aperture, the optical system has sufficient light input, which can make the images taken by the optical system clearer, and is applicable to photographing object space scenes with low light brightness such as high-quality night scenes and starry skies.

[0036] By making the optical system satisfy the relationship: 85deg < FOV < 100deg, the optical system has the characteristic of a large field of view angle, so that the optical system has the characteristics of high pixels and high definition.

[0037] By making the optical system satisfy the relationship: 1.1 < TTL / ImgH < 1.4, the overall optical length of the optical system is smaller, which is beneficial for the optical system to have the characteristic of being ultra-thin, meet the requirements of miniaturization of the optical system, and has more advantages when photographing scenes with medium focal distances.

[0038] In one embodiment, the optical system satisfies the relationship: 0.5 < R11 / f < 1.1; further, the optical system satisfies the relationship: 0.6 < R11 / f < 1. Here, R11 is the curvature radius of the object side surface of the first lens at the optical axis, and f is the effective focal length of the optical system. By making the optical system satisfy the above relationship, the ratio of the curvature radius of the object side surface of the first lens at the optical axis to the effective focal length of the optical system is reasonably configured, which is beneficial to controlling the bending degree of the first lens within a reasonable range, reducing the incident angle of light on the object side surface of the first lens, and enabling the optical system to have good imaging quality.

[0039] In one embodiment, the optical system satisfies the relationship: -1.1 < R12 / f < -0.5; further, the optical system satisfies the relationship: -1 < R12 / f < -0.6. Here, R12 is the curvature radius of the image side surface of the first lens at the optical axis, and f is the effective focal length of the optical system. By making the optical system satisfy the above relationship, the ratio of the curvature radius of the image side surface of the first lens at the optical axis to the effective focal length of the optical system is reasonably configured, which is beneficial to the surface shape matching of the object side and the image side of the first lens, quickly converging light, thereby reducing the head aperture of the optical system and enabling the optical system to achieve head miniaturization.

[0040] In one embodiment, the optical system satisfies the relationship: 5 < |R21| / f; further, the optical system satisfies the relationship: 7 < |R21| / f. Here, R21 is the curvature radius of the object side surface of the second lens at the optical axis, and f is the effective focal length of the optical system. By making the optical system satisfy the above relationship, the ratio of the curvature radius of the object side surface of the second lens at the optical axis to the effective focal length of the optical system is reasonably configured, which is beneficial to extending the propagation distance of light in the small aperture and further improving the degree of head miniaturization of the optical system.

[0041] In one embodiment, the optical system satisfies the relationship: 0.6 < R22 / f < 1.3; further, the optical system satisfies the relationship: 0.7 < R22 / f < 1.2. Here, R22 is the curvature radius of the image side surface of the second lens at the optical axis, and f is the effective focal length of the optical system. By making the optical system satisfy the above relationship, the ratio of the curvature radius of the image side surface of the second lens at the optical axis to the effective focal length of the optical system is reasonably configured, which is beneficial to gently diffusing light toward the image side, avoiding introducing large off-axis chromatic aberration, and thus improving the imaging quality.

[0042] In one embodiment, the optical system satisfies the relation: 0.5 < R31 / f < 1.2; further, the optical system satisfies the relation: 0.6 < R31 / f < 1.1. Here, R31 is the curvature radius of the object side surface of the third lens at the optical axis, and f is the effective focal length of the optical system. By making the optical system satisfy the above relation, the ratio of the curvature radius of the object side surface of the third lens at the optical axis to the effective focal length of the optical system is reasonably configured, which is conducive to controlling the astigmatism of the third lens within a reasonable range, effectively balancing the astigmatism, and enabling the optical system to have good imaging quality.

[0043] In one embodiment, the optical system satisfies the relation: 0.6 < R32 / f < 1.2; further, the optical system satisfies the relation: 0.7 < R32 / f < 1.1. Here, R32 is the curvature radius of the image side surface of the third lens at the optical axis, and f is the effective focal length of the optical system. By making the optical system satisfy the above relation, the surface shapes of the object side and image side of the third lens are similar, avoiding the introduction of axial aberration, facilitating the flexible design of aspherical surfaces, conducive to balancing off-axis aberration, and improving the imaging quality.

[0044] In one embodiment, the optical system satisfies the relation: -1 < R41 / f < -0.3; further, the optical system satisfies the relation: -0.9 < R41 / f < -0.35. Here, R41 is the curvature radius of the object side surface of the fourth lens at the optical axis, and f is the effective focal length of the optical system. By making the optical system satisfy the above relation, the ratio of the curvature radius of the object side surface of the fourth lens at the optical axis to the effective focal length of the optical system is reasonably configured, which is conducive to controlling the astigmatism of the fourth lens within a reasonable range, reducing the incident angle of light on the image side surface of the fourth lens, and enabling the optical system to have good imaging quality.

[0045] In one embodiment, the optical system satisfies the relation: -2.1 < R42 / f < -0.4; further, the optical system satisfies the relation: -1.9 < R42 / f < -0.5. Here, R42 is the curvature radius of the image side surface of the fourth lens at the optical axis, and f is the effective focal length of the optical system. By making the optical system satisfy the above relation, the ratio of the curvature radius of the image side surface of the fourth lens at the optical axis to the effective focal length of the optical system is reasonably configured, reducing the incident angle of light on the image side surface of the fourth lens, reducing the axial back focal length, shortening the total length of the optical system, and making the optical system tend to be miniaturized.

[0046] In one embodiment, the optical system satisfies the relation: 0.2 < R51 / f < 0.8; further, the optical system satisfies the relation: 0.3 < R51 / f < 0.7. Here, R51 is the curvature radius of the object side surface of the fifth lens at the optical axis, and f is the effective focal length of the optical system. By making the optical system satisfy the above relation, the ratio of the curvature radius of the object side surface of the fifth lens at the optical axis to the effective focal length of the optical system is reasonably configured, further reducing the back focal length on the axis, shortening the total length of the optical system, and making the optical system tend to be miniaturized.

[0047] In one embodiment, the optical system satisfies the relation: 2.5 < |R52| / f; further, the optical system satisfies the relation: 3 < |R52| / f < 30. Here, R52 is the curvature radius of the image side surface of the fifth lens at the optical axis, and f is the effective focal length of the optical system. By making the optical system satisfy the above relation, the ratio of the curvature radius of the image side surface of the fifth lens at the optical axis to the effective focal length of the optical system is reasonably configured, which is beneficial for the fifth lens to effectively balance the astigmatism generated by the first lens to the fourth lens, and makes the optical system have good imaging quality.

[0048] In one embodiment, the optical system satisfies the relation: 0.2 < R61 / f < 0.7; further, the optical system satisfies the relation: 0.3 < R61 / f < 0.6. Here, R61 is the curvature radius of the object side surface of the sixth lens at the optical axis, and f is the effective focal length of the optical system. By making the optical system satisfy the above relation, the ratio of the curvature radius of the object side surface of the sixth lens at the optical axis to the effective focal length of the optical system is reasonably configured, which is beneficial for the sixth lens to gently receive the incident light, reduce the introduction of aberration, and make the optical system have good imaging quality.

[0049] In one embodiment, the optical system satisfies the relation: 0.1 < R62 / f < 0.35; further, the optical system satisfies the relation: 0.15 < R62 / f < 0.35. Here, R62 is the curvature radius of the image side surface of the sixth lens at the optical axis, and f is the effective focal length of the optical system. By making the optical system satisfy the above relation, the ratio of the curvature radius of the image side surface of the sixth lens at the optical axis to the effective focal length of the optical system is reasonably configured, which is beneficial for the light to gently exit the sixth lens, reduce the introduction of aberration, and make the optical system have good imaging quality.

[0050] In one embodiment, the optical system satisfies the relation: 1 < |R32 / R41| < 2; further, the optical system satisfies the relation: 1 < |R32 / R41| < 1.9. Here, R32 is the radius of curvature of the image side surface of the third lens at the optical axis, and R41 is the radius of curvature of the object side surface of the fourth lens at the optical axis. By making the optical system satisfy the above relations, it is beneficial to reasonably configure the ratio of the radius of curvature of the image side surface of the third lens at the optical axis to the radius of curvature of the object side surface of the fourth lens at the optical axis, thereby controlling the change in the distance between the gaps between the third lens and the fourth lens, reducing the sensitivity during the manufacturing process of the third lens and the fourth lens, balancing the spherical chromatic aberration of the optical system, and improving the imaging quality of the optical system.

[0051] In one embodiment, the optical system satisfies the relation: 0.3 < |(R61 + R62) / f6| < 0.8; further, the optical system satisfies the relation: 0.4 < |(R61 + R62) / f6| < 0.7. Here, R61 is the radius of curvature of the object side surface of the sixth lens at the optical axis, R62 is the radius of curvature of the image side surface of the sixth lens at the optical axis, and f6 is the effective focal length of the sixth lens. By making the optical system satisfy the above relations, it is beneficial to reasonably configure the ratio of the sum of the radii of curvature of the object side surface and the image side surface of the sixth lens at the optical axis to the effective focal length of the sixth lens, so that the astigmatism of the sixth lens is controlled within a reasonable range, effectively balancing the astigmatism generated by the first lens to the fifth lens, and improving the imaging quality of the optical system.

[0052] In one embodiment, the optical system satisfies the relation: 0.6 < f1 / f < 0.9; further, the optical system satisfies the relation: 0.65 < f1 / f < 0.85. Here, f1 is the effective focal length of the first lens, and f is the effective focal length of the optical system. By making the optical system satisfy the above relations, the ratio of the effective focal length of the first lens to the effective focal length of the optical system is reasonably configured. For the entire optical system, the refractive power of the first lens is not too strong, avoiding introducing excessive spherical aberration, and enabling the optical system to have good imaging quality.

[0053] In one embodiment, the optical system satisfies the relation: -1.6 < f2 / f < -1; further, the optical system satisfies the relation: -1.5 < f2 / f < -1.1. Here, f2 is the effective focal length of the second lens, and f is the effective focal length of the optical system. By making the optical system satisfy the above relations, the ratio of the effective focal length of the second lens to the effective focal length of the optical system is reasonably configured. For the entire optical system, the refractive power of the second lens is not too strong, and it can cooperate with the first lens to correct spherical aberration, enabling the optical system to have good imaging quality.

[0054] In one embodiment, the optical system satisfies the relation: 7 < |f3| / f; further, the optical system satisfies the relation: 9 < |f3| / f < 50. Here, 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, the ratio of the effective focal length of the third lens to the effective focal length of the optical system is reasonably configured, further correcting spherical aberration and chromatic aberration, and enabling the optical system to have good imaging quality.

[0055] In one embodiment, the optical system satisfies the relation: -7 < f4 / f < -1; further, the optical system satisfies the relation: -7 < f4 / f < -1.1. Here, f4 is the effective focal length of the fourth lens, and f is the effective focal length of the optical system. By making the optical system satisfy the above relation, the ratio of the effective focal length of the fourth lens to the effective focal length of the optical system is reasonably configured, smoothly diffusing light rays, reducing the pressure on subsequent lenses to correct aberrations, and improving imaging quality.

[0056] In one embodiment, the optical system satisfies the relation: 0.5 < f5 / f < 1.2; further, the optical system satisfies the relation: 0.6 < f5 / f < 1.1. Here, f5 is the effective focal length of the fifth lens, and f is the effective focal length of the optical system. By making the optical system satisfy the above relation, the ratio of the effective focal length of the fifth lens to the effective focal length of the optical system is reasonably configured. For the entire optical system, it can avoid the excessive burden on the sixth lens, resulting in an overly tortuous surface shape, and enabling the optical system to have good imaging quality.

[0057] In one embodiment, the optical system satisfies the relation: -1.6 < f6 / f < -1; further, the optical system satisfies the relation: -1.5 < f6 / f < -1.1. Here, f6 is the effective focal length of the sixth lens, and f is the effective focal length of the optical system. By making the optical system satisfy the above relation, the ratio of the effective focal length of the sixth lens to the effective focal length of the optical system is reasonably configured. For the entire optical system, the refractive power of the sixth lens is moderate, and it can cooperate with the fifth lens to correct high-order aberrations, enabling the optical system to have good imaging quality.

[0058] In one embodiment, the optical system satisfies the relation:

[0059] In one embodiment, the optical system satisfies the relation: 3.8 < f / SD11 < 4.5; further, the optical system satisfies the relation: 4 < f / SD11 < 4.3. Here, f is the effective focal length of the optical system, and SD11 is the maximum effective aperture of the object side surface of the first lens. By making the optical system satisfy the above relation, it is beneficial to reasonably configure the ratio of the effective focal length of the optical system to the maximum effective aperture of the object side surface of the first lens, that is, the relative light entrance amount of the optical system is maintained within a reasonable range. When the aperture of the first lens is small, a large entrance pupil aperture can be achieved, thereby reducing the f-number of the optical system, improving the light entrance amount of the optical system, and meeting the small head design, making the optical system more suitable for applications in under-screen cameras and scenes with low light. Below the lower limit, the aperture of the first lens is too large, which is not conducive to achieving miniaturization of the head; above the upper limit, the light entrance amount is too small, and the imaging quality is poor under low light conditions.

[0060] In one embodiment, the optical system satisfies the relation: 1.1 < CT1 / SD11 < 1.4; further, the optical system satisfies the relation: 1.1 < CT1 / SD11 < 1.3. Here, CT1 is the thickness of the first lens on the optical axis, and SD11 is the maximum effective aperture of the object side surface of the first lens. By making the optical system satisfy the above relation, the first lens meets the small head design and is very suitable for use in under-screen cameras and low light scenarios. Below the lower limit, the aperture of the first lens is large at this time, which is not conducive to achieving the small head design; above the upper limit, the thickness difference between the bearing area and the optical effective area is too large, resulting in an excessive thickness ratio of the lens, greatly increasing the manufacturing difficulty and being not conducive to improving the yield.

[0061] In one embodiment, the optical system satisfies the relation: 0.6 < ET1 / CT1 < 0.9; further, the optical system satisfies the relation: 0.65 < ET1 / CT1 < 0.8. Here, ET1 is the distance on 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 of the first lens, and CT1 is the thickness of the first lens on the optical axis. By making the optical system satisfy the above relation, the thickness and refractive power of the first lens are reasonably distributed in the direction perpendicular to the optical axis. The first lens is a convex lens with a thicker middle and thinner edges, and the first lens has a positive refractive power, which is beneficial to the first lens to converge the incident light and reduce the total optical length. Optionally, 0.82 mm < CT1 < 0.86 mm, so that the first lens has a relatively wide edge thickness, which is beneficial for the optical system to achieve a larger depth of the head structure on the basis of meeting the small head structure, making the optical system applicable to scenarios such as hole shooting, such as挖孔全面屏 (the description in Chinese seems incorrect here, assuming it should be a proper term like "挖孔全面屏手机"), under-screen camera. Below the lower limit, the edge thickness of the first lens is small, and the depth of the head structure of the optical system is small, making it difficult to meet the requirements of a specific head depth; above the upper limit, the refractive power of the first lens is small, making it difficult to provide good deflection conditions for the incident light, which is not conducive to the convergence of light.

[0062] In one embodiment, the optical system satisfies the relation: 1 < CT5 / ET5 < 1.8; further, the optical system satisfies the relation: 1.1 < CT5 / ET5 < 1.65. Here, CT5 is the thickness of the fifth lens on the optical axis, and ET5 is the distance on the optical axis from the maximum effective aperture of the object side of the fifth lens to the maximum effective aperture of the image side of the fifth lens. By making the optical system satisfy the above relation, the edge thickness and central thickness of the fifth lens are reasonably configured, the shape of the fifth lens is controlled, and the spherical aberration, chromatic aberration and field curvature of the optical system are comprehensively balanced, improving the imaging quality of the optical system.

[0063] In one embodiment, the optical system satisfies the relation: 0.8 < ET6 / CT6 < 1.3; further, the optical system satisfies the relation: 0.85 < ET6 / CT6 < 1.2. Here, ET6 is the distance on the optical axis from the maximum effective aperture of the object side of the sixth lens to the maximum effective aperture of the image side of the sixth lens, and CT6 is the thickness of the sixth lens on the optical axis. By making the optical system satisfy the above relation, the overall thickness of the sixth lens is close, which can reasonably utilize the rear-end space of the optical system and reduce the manufacturing difficulty. Below the lower limit, the proportion of the edge thickness of the sixth lens is small, and it is difficult for the supporting part to reach the thickness standard; above the upper limit, the sixth lens becomes too thick, resulting in too much space occupied by the external supporting part.

[0064] In one embodiment, the optical system satisfies the relation: 1 < CT5 / CT6 < 1.8; further, the optical system satisfies the relation: 1 < CT5 / CT6 < 1.7. Here, CT5 is the thickness of the fifth lens on the optical axis, and CT6 is the thickness of the sixth lens on the optical axis. By making the optical system satisfy the above relation, the distance between the fifth lens and the sixth lens can be reduced, the compactness can be improved, and it helps in miniaturizing the optical system.

[0065] In one embodiment, the optical system satisfies the relation: 3 < TD / CT1 < 4; further, the optical system satisfies the relation: 3.3 < TD / CT1 < 3.9. Here, TD is the distance on the optical axis from the object side surface of the first lens to the image side surface of the sixth lens, and CT1 is the thickness of the first lens on the optical axis. By making the optical system satisfy the above relation, the small head design of the optical system can be met, the thickness of the first lens can be matched with the optical system, which is beneficial to reducing the sensitivity of the first lens, simplifying the processing and forming of the first lens, and better realizing engineering manufacturing.

[0066] In one embodiment, the optical system satisfies the relation: 0.5 < AT56 / AT23 < 1.8; further, the optical system satisfies the relation: 0.6 < AT56 / AT23 < 1.7. Here, AT56 is the distance on the optical axis from the image side surface of the fifth lens to the object side surface of the sixth lens, and AT23 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. By making the optical system satisfy the above relation, it is beneficial to reducing the sensitivity of the second, third, fifth, and sixth lenses, simplifying the processing and forming of the second, third, fifth, and sixth lenses, and better realizing engineering manufacturing.

[0067] In one embodiment, the optical system satisfies the relation: 1 < AT34 / AT23 < 1.6; further, the optical system satisfies the relation: 1 < AT34 / AT23 < 1.5. Here, AT23 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, and AT34 is the distance on the optical axis from the image side surface of the third lens to the object side surface of the fourth lens. By making the optical system satisfy the above relation, it is beneficial to reducing the sensitivity of the second, third, and fourth lenses, simplifying the processing and forming of the second, third, and fourth lenses, and better realizing engineering manufacturing.

[0068] In one embodiment, the optical system satisfies the relation: 4 < T56max / T56min < 11; where T56max is the maximum distance between the fifth lens and the sixth lens parallel to the optical axis, and T56min is the minimum distance between the fifth lens and the sixth lens parallel to the optical axis. By making the optical system satisfy the above relation, it is beneficial to rationally configure the ratio of the maximum distance between the fifth lens and the sixth lens parallel to the optical axis to the minimum distance between the fifth lens and the sixth lens parallel to the optical axis, so that the sizes and refractive powers of the fifth lens and the sixth lens are rationally configured, and the bending degrees of the fifth lens and the sixth lens are kept within a reasonable range, effectively reducing the astigmatism generated by the fifth lens and the sixth lens, reducing the overall sensitivity of the optical system, and being beneficial to the production and manufacturing of the fifth lens and the sixth lens.

[0069] In one embodiment, the optical system satisfies the relation: 0.2 < (SAG11 + SAG21) / TTL < 0.3; where SAG11 is the distance on the optical axis from the intersection of the object side surface of the first lens and the optical axis to the maximum effective radius of the image side surface of the first lens, SAG21 is the distance on the optical axis from the intersection of the object side surface of the second lens and the optical axis to the maximum effective radius of the image side surface of the second lens, and TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the optical system. By making the optical system satisfy the above relation, it is beneficial to rationally control the thicknesses of the first lens and the second lens, that is, to control the structural proportion of the first lens and the second lens with larger thicknesses in the optical system, effectively reducing the overall optical length of the optical system and achieving miniaturization.

[0070] In one embodiment, the optical system satisfies the relation: 4 < L42 / (W4 + V4) < 5; where L42 is half of the maximum effective aperture of the image side surface of the fourth lens, W4 is half of the maximum thickness of the fourth lens, and V4 is half of the minimum thickness of the fourth lens. By making the optical system satisfy the above relation, it is beneficial to rationally configure the curvature of the fourth lens, balance the aberration of the optical system, reduce the sensitivity during the manufacturing process of the fourth lens, and improve the imaging quality of the optical system. Below the lower limit, the sensitivity during the manufacturing process of the fourth lens increases, which is not conducive to the production and manufacturing of the fourth lens; above the upper limit, it is difficult for the fourth lens to correct the field curvature aberration of the optical system, affecting the imaging quality of the optical system.

[0071] In one embodiment, the optical system satisfies the relation: 4 < L62 / (W6 + V6) < 6; where L62 is half of the maximum effective aperture of the image side of the sixth lens, W6 is half of the maximum thickness of the sixth lens, and V6 is half of the minimum thickness of the sixth lens. By making the optical system satisfy the above relation, it is beneficial to reasonably configure the curvature of the sixth lens, balance the aberration of the optical system, reduce the sensitivity during the manufacturing process of the sixth lens, and improve the imaging quality of the optical system. Below the lower limit, the sensitivity during the manufacturing process of the sixth lens increases, which is not conducive to the production and manufacturing of the sixth lens; above the upper limit, it is difficult for the sixth lens to correct the field curvature aberration of the optical system, affecting the imaging quality of the optical system.

[0072] In some embodiments, the optical system further includes a filter, which can be an infrared cut-off filter or an infrared band-pass filter. The infrared cut-off filter is used to filter out infrared light, and the infrared band-pass filter only allows infrared light to pass through. In this application, the filter is an infrared cut-off filter, which is relatively fixed with each lens in the optical system and is used to prevent infrared light from reaching the imaging surface of the optical system and interfering with normal imaging. The filter can be assembled with each lens as a part of the optical system. In some other embodiments, the filter can also be an element independent of the optical system. The filter can be installed between the optical system and the photosensitive chip when the optical system and the photosensitive chip are assembled. It can be understood that the filter can be made of optical glass coating, or colored glass, or filters of other materials, which can be selected according to actual needs and are not specifically limited in this embodiment. In some other embodiments, the function of filtering out infrared light can also be achieved by setting a filter coating on at least one of the first lens to the sixth lens.

[0073] The first embodiment

[0074] Please refer to Figure 1a , the optical system 10 of this embodiment includes, in order from the object side to the image side along the optical axis direction:

[0075] The first lens L1, which has a positive refractive power. The object side surface S1 of the first lens L1 is convex near the optical axis, and the image side surface S2 is convex near the optical axis.

[0076] The second lens L2, which has a negative refractive power. The object side surface S3 of the second lens L2 is concave near the optical axis, and the image side surface S4 is concave near the optical axis.

[0077] The third lens L3, which has a negative 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 concave near the optical axis.

[0078] The fourth lens L4, which 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 convex near the optical axis.

[0079] The fifth lens L5 has positive refractive power. The object side S9 of the fifth lens L5 is convex near the optical axis, and the image side S10 is convex near the optical axis.

[0080] The sixth lens L6 has negative refractive power. The object-side surface S11 of the sixth lens L6 is convex near the optical axis, and the image-side surface S12 is concave near the optical axis.

[0081] In addition, the optical system 10 also includes an aperture stop STO, an IR filter, and an imaging surface IMG. In this embodiment, the aperture stop STO is disposed on the object side of the first lens L1 of the optical system 10 to control the amount of light entering. The IR filter is disposed between the sixth lens L6 and the imaging surface IMG, and includes an object side S13 and an image side S14. The IR filter is an infrared cut-off filter, which is used to filter out infrared light so that the light entering the imaging surface IMG is only visible light with a wavelength of 380nm-780nm. The infrared cut-off filter can be made of glass or plastic, and a coating can be deposited on its surface. The first lens L1 to the sixth lens L6 can be made of glass or plastic. The effective pixel area of ​​the photosensitive chip is located on the imaging surface, and the photosensitive chip is disposed at the imaging surface IMG. The photosensitive chip captures different wavelength information of the object for subsequent processing.

[0082] Table 1a shows the parameters of the optical system 10 of this embodiment, where the Y-radius is the radius of curvature of the object-side or image-side surface of the corresponding surface number at the optical axis. Surface numbers S1 and S2 are the object-side surface S1 and image-side surface S2 of the first lens L1, respectively; that is, in the same lens, the surface with the smaller surface number is the object-side surface, and the surface with the 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 to the next surface in the image-side direction. The focal length, material refractive index, and Abbe number are all obtained using visible light with a reference wavelength of 555 nm, and the units for Y-radius, thickness, and focal length are all millimeters (mm).

[0083] Table 1a

[0084]

[0085] Where f is the effective focal length of the optical system 10, FNO is the aperture number of the optical system 10, FOV is the maximum field of view of the optical system 10, and TTL is the distance from the object side of the first lens to the imaging surface on the optical axis, i.e., the total optical length.

[0086] In this embodiment, the object-side surface and image-side surface of the first lens L1 to the sixth lens L6 are both aspherical surfaces. The surface shape x of the aspherical surface can be defined using, but is not limited to, the following aspherical surface formula:

[0087]

[0088] Where x is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the vertex of the aspherical surface, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th higher-order term in the aspherical surface shape formula. Table 1b gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of the aspherical mirrors S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, and S12 that can be used in the first embodiment.

[0089] Table 1b

[0090] Face number S1 S2 S3 S4 S5 S6 k -7.0801E+00 -9.2072E+00 -9.9000E+01 -4.3860E+00 -1.2248E+01 -1.0581E+01 A4 -7.1694E-03 2.6375E-01 1.1438E-01 1.2907E-02 -3.0786E-01 -2.8546E-01 A6 8.1802E-01 -3.0943E+00 2.4063E-01 8.1510E-02 2.5514E+00 2.8724E+00 A8 -1.1193E+01 1.6848E+01 -8.7298E+00 2.3450E+00 -3.2447E+01 -2.9009E+01 A10 8.1231E+01 -6.8795E+01 8.0912E+01 -4.4627E+01 2.7409E+02 1.8745E+02 A12 -3.6356E+02 1.9923E+02 -4.5526E+02 3.8270E+02 -1.6347E+03 -8.8811E+02 A14 1.0114E+03 -3.8707E+02 1.7401E+03 -2.0012E+03 7.0404E+03 3.1735E+03 A16 -1.7029E+03 4.7578E+02 -4.7031E+03 7.0006E+03 -2.2084E+04 -8.5666E+03 A18 1.5879E+03 -3.3302E+02 9.1474E+03 -1.7057E+04 5.0583E+04 1.7347E+04 A20 -6.2919E+02 1.0085E+02 -1.2851E+04 2.9399E+04 -8.4259E+04 -2.6033E+04 A22 0.0000E+00 0.0000E+00 1.2924E+04 -3.5754E+04 1.0072E+05 2.8396E+04 A24 0.0000E+00 0.0000E+00 -9.0709E+03 3.0035E+04 -8.4026E+04 -2.1798E+04 A26 0.0000E+00 0.0000E+00 4.2200E+03 -1.6591E+04 4.6391E+04 1.1128E+04 A28 0.0000E+00 0.0000E+00 -1.1693E+03 5.4242E+03 -1.5217E+04 -3.3824E+03 A30 0.0000E+00 0.0000E+00 1.4609E+02 -7.9539E+02 2.2436E+03 4.6181E+02 Face number S7 S8 S9 S10 S11 S12 k -6.5657E+00 -1.0100E-02 -1.8133E+00 -9.9000E+01 -7.9699E+00 -3.9710E+00 A4 1.5418E-01 -8.1558E-01 -1.2794E-01 6.3866E+00 -1.5851E+01 -7.1741E+00 A6 6.2930E-01 1.7224E+00 -1.2013E+00 -4.0850E+01 2.6764E+01 1.7634E+01 A8 1.9898E+01 2.4118E+01 -5.0125E+00 1.1419E+02 -1.8802E+02 1.1967E+00 A10 -2.8000E+02 -2.8562E+02 1.5638E+00 -1.8831E+02 3.3741E+03 -9.8097E+01 A12 1.8290E+03 1.5248E+03 1.8047E+02 2.4493E+02 -2.0198E+04 1.9613E+02 A14 -7.7282E+03 -4.9330E+03 -1.0974E+03 -5.0418E+02 5.8631E+04 -4.8504E+01 A16 2.3144E+04 1.0258E+04 3.7026E+03 1.5112E+03 -7.9066E+04 -4.8091E+02 A18 -5.0776E+04 -1.3326E+04 -8.4402E+03 -3.6481E+03 -1.9623E+04 1.1781E+03 A20 8.2135E+04 8.8409E+03 1.3562E+04 6.1744E+03 2.7451E+05 -1.6689E+03 A22 -9.6790E+04 1.4648E+03 -1.5316E+04 -7.2256E+03 -5.2060E+05 1.7033E+03 A24 8.0591E+04 -8.4920E+03 1.1846E+04 5.7443E+03 5.3483E+05 -1.2720E+03 A26 -4.4769E+04 7.4595E+03 -5.9532E+03 -2.9637E+03 -3.2793E+05 6.5032E+02 A28 1.4833E+04 -3.0321E+03 1.7469E+03 8.9518E+02 1.1335E+05 -1.9976E+02 A30 -2.2101E+03 4.9628E+02 -2.2674E+02 -1.2011E+02 -1.7101E+04 2.7444E+01

[0091] Figure 1b Figure (a) shows the longitudinal spherical aberration curve of the optical system 10 of the first embodiment at a wavelength of 572.5618 nm. The horizontal axis along the X-axis represents the focal shift, i.e., the distance from the imaging plane to the intersection of the light ray and the optical axis (in mm). The vertical axis along the Y-axis represents the normalized field of view. The longitudinal spherical aberration curve represents the deviation of the converging focal point of light rays of different wavelengths after passing through the lenses of the optical system 10. Figure 1b As can be seen in (a), the convergence focus of each wavelength of light in the first embodiment tends to be consistent, and the blur spots or color halos in the image are effectively suppressed, indicating that the imaging quality of the optical system 10 in this embodiment is good.

[0092] Figure 1b Figure (b) shows the astigmatism curve of the optical system 10 of the first embodiment at a wavelength of 572.5618 nm, where the horizontal axis along the X-axis represents the focus shift and the vertical axis along the Y-axis represents the image height, both in mm. The S-curve in the astigmatism curve represents the sagittal field curvature at 572.5618 nm, and the T-curve represents the meridional field curvature at 572.5618 nm. Figure 1b As can be seen in (b), the field curvature of the optical system 10 is small, and the field curvature and astigmatism of each field of view are well corrected, with clear imaging at both the center and edge of the field of view.

[0093] Figure 1bImage (c) shows the distortion curve of the optical system 10 of the first embodiment at a wavelength of 572.5618 nm. The horizontal axis along the X-axis represents the distortion value, denoted as %, and the vertical axis along the Y-axis represents the image height, in mm. The distortion curve represents the distortion magnitude corresponding to different field of view angles. Figure 1b As can be seen in (c), at a wavelength of 572.5618 nm, the image distortion caused by the main beam is small, and the imaging quality of the system is excellent.

[0094] Depend on Figure 1b (a) Figure 1b (b) and Figure 1b As can be seen from (c), the optical system 10 of this embodiment has small aberrations and good imaging quality, and has good imaging quality.

[0095] Second Embodiment

[0096] Please refer to Figure 2a The optical system 10 of this embodiment includes, from the object side to the image side along the optical axis:

[0097] The first lens L1 has positive refractive power. The object side S1 of the first lens L1 is convex near the optical axis, and the image side S2 is convex near the optical axis.

[0098] The second lens L2 has negative refractive power. The object side S3 of the second lens L2 is convex near the optical axis, and the image side S4 is concave near the optical axis.

[0099] The third lens L3 has negative refractive power. The object side S5 of the third lens L3 is convex near the optical axis, and the image side S6 is concave near the optical axis.

[0100] The fourth lens L4 has negative refractive power. The object side S7 of the fourth lens L4 is concave near the optical axis, and the image side S8 is convex near the optical axis.

[0101] The fifth lens L5 has positive refractive power. The object side S9 of the fifth lens L5 is convex near the optical axis, and the image side S10 is concave near the optical axis.

[0102] The sixth lens L6 has negative refractive power. The object-side surface S11 of the sixth lens L6 is convex near the optical axis, and the image-side surface S12 is concave near the optical axis.

[0103] The other structures of the second embodiment are the same as those of the first embodiment, and can be referred to accordingly.

[0104] Table 2a shows the parameters of the optical system 10 in this embodiment. The focal length, material refractive index and Abbe number are obtained using visible light with a reference wavelength of 555 nm. The units for Y radius, thickness and focal length are millimeters (mm). The meanings of the other parameters are the same as those in the first embodiment.

[0105] Table 2a

[0106]

[0107] Where f is the focal length of the optical system 10, FNO is the aperture number of the optical system 10, FOV is the maximum field of view of the optical system 10, and TTL is the distance from the object side of the first lens to the imaging surface on the optical axis, i.e., the total optical length.

[0108] Table 2b gives the higher-order coefficients that can be used for each aspherical mirror in the second embodiment, wherein each aspherical surface shape can be defined by the formula given in the first embodiment.

[0109] Table 2b

[0110] Face number S1 S2 S3 S4 S5 S6 k -6.5913E+00 -4.7789E+00 9.9000E+01 -2.8313E+00 -1.6478E+01 -1.1597E+01 A4 -6.8163E-02 1.6455E-01 1.7488E-01 3.1022E-02 -1.9784E-02 1.8726E-01 A6 2.5602E+00 -3.1091E+00 -1.1808E+00 -6.0333E-01 -6.0713E+00 -5.5081E+00 A8 -4.0819E+01 3.9846E+01 1.2072E+01 1.2739E+01 8.6530E+01 4.6995E+01 A10 3.8632E+02 -3.7648E+02 -1.2238E+02 -1.2914E+02 -8.2620E+02 -2.7949E+02 A12 -2.3813E+03 2.4071E+03 8.6264E+02 8.3333E+02 5.4716E+03 1.0970E+03 A14 1.0060E+04 -1.0584E+04 -4.1437E+03 -3.7121E+03 -2.5597E+04 -2.5913E+03 A16 -3.0036E+04 3.2719E+04 1.3902E+04 1.1791E+04 8.5947E+04 2.2893E+03 A18 6.4412E+04 -7.2042E+04 -3.3151E+04 -2.7096E+04 -2.0893E+05 6.4880E+03 A20 -9.9620E+04 1.1322E+05 5.6531E+04 4.5183E+04 3.6753E+05 -2.8183E+04 A22 1.1017E+05 -1.2571E+05 -6.8460E+04 -5.4167E+04 -4.6245E+05 5.2500E+04 A24 -8.4976E+04 9.6026E+04 5.7489E+04 4.5512E+04 4.0513E+05 -5.8305E+04 A26 4.3427E+04 -4.7838E+04 -3.1815E+04 -2.5442E+04 -2.3435E+05 3.9743E+04 A28 -1.3216E+04 1.3933E+04 1.0430E+04 8.4955E+03 8.0345E+04 -1.5415E+04 A30 1.8132E+03 -1.7899E+03 -1.5335E+03 -1.2812E+03 -1.2348E+04 2.6140E+03 Face number S7 S8 S9 S10 S11 S12 k -8.1838E+00 -3.0028E+00 -1.5464E+00 7.3730E+00 -4.7980E+00 -3.1726E+00 A4 1.0976E+00 -9.6154E-01 -1.4920E-01 7.4080E+00 -4.3686E+00 -8.0145E+00 A6 -2.2894E+00 8.7376E+00 -4.8976E-01 -4.8507E+01 -9.0029E+00 1.2823E+01 A8 -1.5643E+01 -7.7692E+01 -9.3101E+00 1.4949E+02 7.8545E+01 9.5629E+01 A10 2.8637E+02 5.5577E+02 2.8720E+01 -2.6954E+02 -2.1628E+02 -9.5378E+02 A12 -2.3301E+03 -2.7352E+03 -2.7201E+01 9.8384E+01 4.8408E+02 5.2042E+03 A14 1.1826E+04 8.9004E+03 -3.7464E+01 1.2501E+03 -1.2204E+03 -1.9948E+04 A16 -4.0819E+04 -1.8747E+04 1.8913E+02 -4.8841E+03 2.8690E+03 5.4728E+04 A18 9.9359E+04 2.3742E+04 -4.6485E+02 1.0239E+04 -5.1399E+03 -1.0768E+05 A20 -1.7264E+05 -1.2363E+04 8.6000E+02 -1.3788E+04 6.6285E+03 1.5182E+05 A22 2.1281E+05 -1.1442E+04 -1.1552E+03 1.2182E+04 -6.0556E+03 -1.5199E+05 A24 -1.8145E+05 2.6495E+04 1.0590E+03 -6.8105E+03 3.8301E+03 1.0542E+05 A26 1.0154E+05 -2.1635E+04 -6.2405E+02 2.1619E+03 -1.5967E+03 -4.8136E+04 A28 -3.3478E+04 8.7633E+03 2.1315E+02 -2.7917E+02 3.9478E+02 1.3009E+04 A30 4.9212E+03 -1.4640E+03 -3.2102E+01 -8.7065E+00 -4.3859E+01 -1.5752E+03

[0111] Figure 2b (a) Figure 2b (b) Figure 2b Image (c) shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system 10 at different focal lengths in the second embodiment. The longitudinal spherical aberration curve represents the deviation of the converging focal point of light rays of different wavelengths after passing through the lenses of the optical system 10; the astigmatism curve represents the meridional field curvature and sagittal field curvature; and the distortion curve represents the distortion magnitude corresponding to different field of view angles. Figure 2b As can be seen from the aberration diagram, the longitudinal spherical aberration, field curvature, and distortion of the optical system 10 are well controlled, thus the optical system 10 of this embodiment has good imaging quality.

[0112] Third Embodiment

[0113] Please refer to Figure 3a The optical system 10 of this embodiment includes, from the object side to the image side along the optical axis:

[0114] The first lens L1 has positive refractive power. The object side S1 of the first lens L1 is convex near the optical axis, and the image side S2 is convex near the optical axis.

[0115] The second lens L2 has negative refractive power. The object side S3 of the second lens L2 is convex near the optical axis, and the image side S4 is concave near the optical axis.

[0116] The third lens L3 has negative refractive power. The object side S5 of the third lens L3 is convex near the optical axis, and the image side S6 is concave near the optical axis.

[0117] The fourth lens L4 has negative refractive power. The object side S7 of the fourth lens L4 is concave near the optical axis, and the image side S8 is convex near the optical axis.

[0118] The fifth lens L5 has positive refractive power. The object side S9 of the fifth lens L5 is convex near the optical axis, and the image side S10 is concave near the optical axis.

[0119] The sixth lens L6 has negative refractive power. The object-side surface S11 of the sixth lens L6 is convex near the optical axis, and the image-side surface S12 is concave near the optical axis.

[0120] The other structures of the third embodiment are the same as those of the first embodiment, and can be referred to accordingly.

[0121] Table 3a shows the parameters of the optical system 10 in this embodiment. The focal length, material refractive index and Abbe number are obtained using visible light with a reference wavelength of 555 nm. The units for Y radius, thickness and focal length are millimeters (mm). The meanings of the other parameters are the same as those in the first embodiment.

[0122] Table 3a

[0123]

[0124] Where f is the focal length of the optical system 10, FNO is the aperture number of the optical system 10, FOV is the maximum field of view of the optical system 10, and TTL is the distance from the object side of the first lens to the imaging surface on the optical axis, i.e., the total optical length.

[0125] Table 3b gives the higher-order coefficients that can be used for each aspherical mirror in the third embodiment, wherein each aspherical surface shape can be defined by the formula given in the first embodiment.

[0126] Table 3b

[0127]

[0128]

[0129] Figure 3b (a) Figure 3b (b) Figure 3bImage (c) shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system 10 at different focal lengths in the third embodiment. The longitudinal spherical aberration curve represents the deviation of the converging focal point of light rays of different wavelengths after passing through the lenses of the optical system 10; the astigmatism curve represents the meridional field curvature and sagittal field curvature; and the distortion curve represents the distortion magnitude corresponding to different field of view angles. Figure 3b As can be seen from the aberration diagram, the longitudinal spherical aberration, field curvature, and distortion of the optical system 10 are well controlled, thus the optical system 10 of this embodiment has good imaging quality.

[0130] Fourth embodiment

[0131] Please refer to Figure 4a The optical system 10 of this embodiment includes, from the object side to the image side along the optical axis:

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

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

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

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

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

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

[0138] Table 4a shows the parameters of the optical system 10 in this embodiment. The focal length, material refractive index and Abbe number are obtained using visible light with a reference wavelength of 555 nm. The units for Y radius, thickness and focal length are millimeters (mm). The meanings of the other parameters are the same as those in the first embodiment.

[0139] Table 4a

[0140]

[0141]

[0142] Where f is the focal length of the optical system 10, FNO is the aperture number of the optical system 10, FOV is the maximum field of view of the optical system 10, and TTL is the distance from the object side of the first lens to the imaging surface on the optical axis, i.e., the total optical length.

[0143] Table 4b gives the higher-order coefficients that can be used for each aspherical mirror in the fourth embodiment, wherein each aspherical surface shape can be defined by the formula given in the first embodiment.

[0144] Table 4b

[0145] Face number S1 S2 S3 S4 S5 S6 k -1.1569E+01 -3.4334E+00 -9.9000E+01 -7.0356E+00 -1.9526E+01 -9.9000E+01 A4 -2.0265E-02 -2.7258E-02 -3.6390E-02 -6.3400E-02 -1.1985E-01 6.4646E-01 A6 6.2807E-01 2.7781E-02 7.5533E-01 5.1695E-01 6.5854E-01 -2.4865E+00 A8 -7.8319E+00 2.2279E+00 -4.8678E+00 -1.4130E+00 -1.3089E+01 -1.2084E+01 A10 5.2284E+01 -3.0071E+01 2.8030E+01 1.9643E+00 1.0251E+02 2.0014E+02 A12 -1.8794E+02 2.1069E+02 -1.4745E+02 8.0299E+00 -4.9499E+02 -1.3529E+03 A14 2.2760E+02 -9.7302E+02 6.0191E+02 -9.9751E+01 1.6435E+03 5.9280E+03 A16 9.9525E+02 3.1348E+03 -1.7799E+03 5.1114E+02 -3.8964E+03 -1.8266E+04 A18 -5.6582E+03 -7.1730E+03 3.7722E+03 -1.5836E+03 6.6874E+03 4.0550E+04 A20 1.4047E+04 1.1696E+04 -5.7245E+03 3.2149E+03 -8.3266E+03 -6.5124E+04 A22 -2.1174E+04 -1.3471E+04 6.1705E+03 -4.3850E+03 7.4648E+03 7.4925E+04 A24 2.0479E+04 1.0695E+04 -4.6150E+03 3.9930E+03 -4.7242E+03 -6.0150E+04 A26 -1.2467E+04 -5.5648E+03 2.2779E+03 -2.3322E+03 2.0241E+03 3.1969E+04 A28 4.3634E+03 1.7068E+03 -6.6761E+02 7.9110E+02 -5.3423E+02 -1.0099E+04 A30 -6.7087E+02 -2.3383E+02 8.8012E+01 -1.1858E+02 6.6502E+01 1.4343E+03 Face number S7 S8 S9 S10 S11 S12 k -1.8137E+01 0.0000E+00 -8.9310E-01 -6.7832E+01 -3.2236E+00 -2.0503E+00 A4 5.1742E-01 2.5170E+00 2.1830E+00 -2.6518E-01 -1.8643E+01 -2.4641E+01 A6 3.9559E+00 -1.3078E+01 -2.8730E+01 6.0889E+01 1.2164E+02 2.2603E+02 A8 -5.2686E+01 5.5767E+01 2.4420E+02 -6.2793E+02 -9.7014E+02 -1.8335E+03 A10 3.0116E+02 -3.8017E+02 -1.8662E+03 2.3951E+03 5.8138E+03 1.1937E+04 A12 -1.0501E+03 2.6630E+03 1.0891E+04 2.3120E+03 -2.0503E+04 -5.7994E+04 A14 2.1846E+03 -1.2916E+04 -4.5581E+04 -6.3934E+04 4.2047E+04 2.0723E+05 A16 -1.5574E+03 4.2282E+04 1.3565E+05 3.1337E+05 -4.5798E+04 -5.4630E+05 A18 -5.5293E+03 -9.5730E+04 -2.8799E+05 -8.7390E+05 8.2915E+03 1.0643E+06 A20 2.1052E+04 1.5201E+05 4.3537E+05 1.5930E+06 4.8559E+04 -1.5246E+06 A22 -3.6539E+04 -1.6905E+05 -4.6308E+05 -1.9667E+06 -7.3196E+04 1.5818E+06 A24 3.8165E+04 1.2911E+05 3.3748E+05 1.6359E+06 5.2390E+04 -1.1538E+06 A26 -2.4445E+04 -6.4571E+04 -1.5998E+05 -8.7988E+05 -2.0367E+04 5.6007E+05 A28 8.8584E+03 1.9063E+04 4.4337E+04 2.7676E+05 3.8397E+03 -1.6220E+05 A30 -1.3919E+03 -2.5201E+03 -5.4392E+03 -3.8695E+04 -2.1099E+02 2.1178E+04

[0146] Figure 4b (a) Figure 4b (b) Figure 4b Image (c) shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system 10 at different focal lengths in the fourth embodiment. The longitudinal spherical aberration curve represents the deviation of the converging focal point of light rays of different wavelengths after passing through the lenses of the optical system 10; the astigmatism curve represents the meridional field curvature and sagittal field curvature; and the distortion curve represents the distortion magnitude corresponding to different field of view angles. Figure 4b As can be seen from the aberration diagram, the longitudinal spherical aberration, field curvature, and distortion of the optical system 10 are well controlled, thus the optical system 10 of this embodiment has good imaging quality.

[0147] Fifth embodiment

[0148] Please refer to Figure 5a The optical system 10 of this embodiment includes, from the object side to the image side along the optical axis:

[0149] The first lens L1 has positive refractive power. The object side S1 of the first lens L1 is convex near the optical axis, and the image side S2 is convex near the optical axis.

[0150] The second lens L2 has negative refractive power. The object side S3 of the second lens L2 is concave near the optical axis, and the image side S4 is concave near the optical axis.

[0151] The third lens L3 has positive refractive power. The object side S5 of the third lens L3 is convex near the optical axis, and the image side S6 is concave near the optical axis.

[0152] The fourth lens L4 has negative refractive power. The object side S7 of the fourth lens L4 is concave near the optical axis, and the image side S8 is convex near the optical axis.

[0153] The fifth lens L5 has positive refractive power. The object side S9 of the fifth lens L5 is convex near the optical axis, and the image side S10 is concave near the optical axis.

[0154] The sixth lens L6 has negative refractive power. The object-side surface S11 of the sixth lens L6 is convex near the optical axis, and the image-side surface S12 is concave near the optical axis.

[0155] Table 5a shows the parameters of the optical system 10 in this embodiment. The focal length, material refractive index and Abbe number are obtained using visible light with a reference wavelength of 555 nm. The units for Y radius, thickness and focal length are millimeters (mm). The meanings of the other parameters are the same as those in the first embodiment.

[0156] Table 5a

[0157]

[0158] Where f is the focal length of the optical system 10, FNO is the aperture number of the optical system 10, FOV is the maximum field of view of the optical system 10, and TTL is the distance from the object side of the first lens to the imaging surface on the optical axis, i.e., the total optical length.

[0159] Table 5b gives the higher-order coefficients that can be used for each aspherical mirror in the fifth embodiment, wherein each aspherical surface shape can be defined by the formula given in the first embodiment.

[0160] Table 5b

[0161] Face number S1 S2 S3 S4 S5 S6 k -1.4384E+01 -3.2861E+00 -1.4486E+01 -8.7970E+00 -1.1759E+01 0.0000E+00 A4 -1.3557E-02 3.1863E-05 8.7878E-02 6.6603E-02 -3.7250E-02 7.4728E-02 A6 4.0548E-01 6.3028E-01 2.8517E-01 -4.6864E-01 7.8841E-03 2.7614E-01 A8 -5.7241E+00 -1.3135E+01 -9.9389E+00 3.2264E+00 -5.6806E+00 -1.2501E+01 A10 4.6959E+01 1.2010E+02 1.0172E+02 -1.8063E+01 3.4824E+01 9.2647E+01 A12 -2.5220E+02 -6.7910E+02 -6.1464E+02 9.1675E+01 -9.2470E+01 -4.5457E+02 A14 9.3368E+02 2.5948E+03 2.4765E+03 -3.8408E+02 1.7338E+01 1.6963E+03 A16 -2.4615E+03 -6.9756E+03 -6.9950E+03 1.2017E+03 7.3155E+02 -4.8809E+03 A18 4.7054E+03 1.3451E+04 1.4163E+04 -2.7074E+03 -2.7490E+03 1.0649E+04 A20 -6.5572E+03 -1.8696E+04 -2.0680E+04 4.3420E+03 5.5135E+03 -1.7238E+04 A22 6.6091E+03 1.8576E+04 2.1598E+04 -4.8985E+03 -7.0177E+03 2.0199E+04 A24 -4.6996E+03 -1.2870E+04 -1.5736E+04 3.7932E+03 5.8315E+03 -1.6563E+04 A26 2.2384E+03 5.9053E+03 7.5944E+03 -1.9177E+03 -3.0724E+03 8.9837E+03 A28 -6.4122E+02 -1.6128E+03 -2.1813E+03 5.6969E+02 9.3256E+02 -2.8897E+03 A30 8.3543E+01 1.9847E+02 2.8220E+02 -7.5380E+01 -1.2422E+02 4.1676E+02 Face number S7 S8 S9 S10 S11 S12 k -1.0238E+01 -2.8970E+01 -1.1692E+00 9.5929E+01 -2.2948E+00 -2.1932E+00 A4 8.4039E-02 -2.2539E-01 3.5787E+00 1.2957E+01 -1.0562E+00 -1.1306E+01 A6 3.4070E+00 -5.3848E-01 -5.4888E+01 -1.3556E+02 -1.7938E+02 -3.9696E+01 A8 -2.6118E+01 -3.0394E+00 4.5570E+02 1.0235E+03 2.4549E+03 1.4076E+03 A10 1.2106E+02 6.5764E+01 -2.7058E+03 -6.3241E+03 -1.9309E+04 -1.4046E+04 A12 -3.7860E+02 -3.7948E+02 1.1585E+04 3.0827E+04 1.0038E+05 8.3599E+04 A14 7.6515E+02 1.3412E+03 -3.5817E+04 -1.1462E+05 -3.5682E+05 -3.3424E+05 A16 -7.7617E+02 -3.3928E+03 7.9615E+04 3.1941E+05 8.8860E+05 9.4030E+05 A18 -5.2579E+02 6.3907E+03 -1.2562E+05 -6.5996E+05 -1.5768E+06 -1.9008E+06 A20 3.3461E+03 -8.9087E+03 1.3674E+05 9.9959E+05 2.0064E+06 2.7763E+06 A22 -5.9759E+03 8.8934E+03 -9.6515E+04 -1.0909E+06 -1.8187E+06 -2.9062E+06 A24 6.1323E+03 -6.0086E+03 3.7514E+04 8.3280E+05 1.1469E+06 2.1265E+06 A26 -3.8459E+03 2.5021E+03 -2.6430E+03 -4.2139E+05 -4.7826E+05 -1.0330E+06 A28 1.3776E+03 -5.3345E+02 -3.5523E+03 1.2684E+05 1.1852E+05 2.9928E+05 A30 -2.1726E+02 3.3523E+01 9.9522E+02 -1.7182E+04 -1.3211E+04 -3.9142E+04

[0162] Figure 5b (a) Figure 5b (b) Figure 5b Image (c) shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system 10 at different focal lengths in the fifth embodiment. The longitudinal spherical aberration curve represents the deviation of the converging focal point of light rays of different wavelengths after passing through the lenses of the optical system 10; the astigmatism curve represents the meridional field curvature and sagittal field curvature; and the distortion curve represents the distortion magnitude corresponding to different field of view angles. Figure 5b As can be seen from the aberration diagram, the longitudinal spherical aberration, field curvature, and distortion of the optical system 10 are well controlled, thus the optical system 10 of this embodiment has good imaging quality.

[0163] Sixth Embodiment

[0164] Please refer to Figure 6a The optical system 10 of this embodiment includes, from the object side to the image side along the optical axis:

[0165] The first lens L1 has positive refractive power. The object side S1 of the first lens L1 is convex near the optical axis, and the image side S2 is convex near the optical axis.

[0166] The second lens L2 has negative refractive power. The object side S3 of the second lens L2 is convex near the optical axis, and the image side S4 is concave near the optical axis.

[0167] The third lens L3 has positive refractive power. The object side S5 of the third lens L3 is convex near the optical axis, and the image side S6 is concave near the optical axis.

[0168] The fourth lens L4 has negative refractive power. The object side S7 of the fourth lens L4 is concave near the optical axis, and the image side S8 is convex near the optical axis.

[0169] The fifth lens L5 has positive refractive power. The object side S9 of the fifth lens L5 is convex near the optical axis, and the image side S10 is concave near the optical axis.

[0170] The sixth lens L6 has negative refractive power. The object-side surface S11 of the sixth lens L6 is convex near the optical axis, and the image-side surface S12 is concave near the optical axis.

[0171] Table 6a shows the parameters of the optical system 10 in this embodiment. The focal length, material refractive index and Abbe number are obtained using visible light with a reference wavelength of 555 nm. The units for Y radius, thickness and focal length are millimeters (mm). The meanings of the other parameters are the same as those in the first embodiment.

[0172] Table 6a

[0173]

[0174] Where f is the focal length of the optical system 10, FNO is the aperture number of the optical system 10, FOV is the maximum field of view of the optical system 10, and TTL is the distance from the object side of the first lens to the imaging surface on the optical axis, i.e., the total optical length.

[0175] Table 6b gives the higher-order coefficients that can be used for each aspherical mirror in the sixth embodiment, wherein each aspherical surface shape can be defined by the formula given in the first embodiment.

[0176] Table 6b

[0177]

[0178]

[0179] Figure 6b (a) Figure 6b (b) Figure 6b(c) The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system 10 at different focal lengths in the sixth embodiment are shown respectively. The longitudinal spherical aberration curve represents the deviation of the converging focal point of light rays of different wavelengths after passing through the lenses of the optical system 10; the astigmatism curve represents the meridional field curvature and sagittal field curvature; and the distortion curve represents the distortion magnitude corresponding to different field of view angles. Figure 6b As can be seen from the aberration diagram, the longitudinal spherical aberration, field curvature, and distortion of the optical system 10 are well controlled, thus the optical system 10 of this embodiment has good imaging quality.

[0180] Table 7 shows the values ​​of FNO, FOV, TTL / ImgH, R11 / f, R12 / f, |R21| / f, R22 / f, R31 / f, R32 / f, R41 / f, R42 / f, R51 / f, |R52| / f, R61 / f, R62 / f, f1 / f, f2 / f, |f3| / f, f4 / f, f5 / f, f6 / f, and FNO*tan(HFOV) in the optical systems of the first to sixth embodiments. The values ​​of f / SD11, CT1 / SD11, ET1 / CT1, CT5 / ET5, ET6 / CT6, CT5 / CT6, TD / CT1, AT56 / AT23, AT34 / AT23, (SAG11+SAG21) / TTL, |R32 / R41|, |(R61+R62) / f6|, L42 / (W4+V4), L62 / (W6+V6), and T56max / T56min.

[0181] Table 7

[0182]

[0183]

[0184] As can be seen from Table 7, the optical systems of the first to sixth embodiments all satisfy the following relational expressions: 1.9 < FNO < 2.3, 85deg < FOV < 100deg, 1.1 < TTL / ImgH < 1.4, 0.5 < R11 / f < 1.1, -1.1 < R12 / f < -0.5, 5 < |R21| / f, 0.6 < R22 / f < 1.3, 0.5 < R31 / f < 1.2, 0.6 < R32 / f < 1.2, -1 < R4 / f < -0.3, -2.1 < R42 / f < -0.4, 0.2 < R51 / f < 0.8, 2.5 < |R52| / f, 0.2 < R61 / f < 0.7, 0.1 < R62 / f < 0.35, 0.6 < f1 / f < 0.9, -1.6 < f2 / f < -1, 7 < |f3| / f, -7 < f4 / f < -1, 0.5 < f5 / f < 1.2, -1.6 < f6 / f < -1, 2 < FNO * tan(HFOV) < 2.4, 3.8 < f / SD11 < 4.5, 1.1 < CT1 / SD11 < 1.4, 0.6 < ET1 / CT1 < 0.9, 1 < CT5 / ET5 < 1.8, 0.8 < ET6 / CT6 < 1.3, 1 < CT5 / CT6 < 1.8, 3 < TD / CT1 < 4, 0.5 < AT56 / AT23 < 1.8, 1 < AT34 / AT23 < 1.6, 0.2 < (SAG11 + SAG21) / TTL < 0.3, 1 < |R32 / R41| < 2, 0.3 < |(R61 + R62) / f6| < 0.8, 4 < L42 / (W4 + V4) < 5, 4 < L62 / (W6 + V6) < 6, 4 < T56max / T56min < 11.

[0185] Please refer to Figure 7 , the present invention also provides an imaging module 20, which includes a photosensitive chip 21 and the optical system 10 according to any one of the embodiments of the first aspect. The photosensitive chip 21 is disposed on the image side of the optical system 10. Among them, the photosensitive surface of the photosensitive chip 21 is located on the imaging surface of the optical system 10, and the light of the object incident on the photosensitive surface through the lens can be converted into an electrical signal of an image. The photosensitive chip 21 can be a Complementary Metal Oxide Semiconductor (CMOS) or a Charge - coupled Device (CCD). The imaging module 20 can be an imaging module integrated on 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 satisfies large aperture, miniaturization and has good imaging effects.

[0186] Please see Figure 8 The present invention also provides an electronic device 30, which includes a housing 31 and the aforementioned camera module 20, wherein the camera module 20 is disposed within the housing 31. This electronic device 30 includes, but is not limited to, automobiles, surveillance systems, smartphones, computers, and smartwatches. By incorporating the camera module 20 provided by the present invention into the electronic device 30, the electronic device 30 achieves a large aperture, miniaturization, and excellent imaging performance.

[0187] The above description discloses only some preferred embodiments of the present invention, and should not be construed as limiting the scope of the present invention. Those skilled in the art can understand that implementing all or part of the above embodiments and making equivalent changes in accordance with the claims of the present invention still fall within the scope of 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 has positive refractive power, and both the object side surface and the image side surface of the first lens are convex near the optical axis; The second lens has negative refractive power, and the image side surface of the second lens is concave near the optical axis; The third lens has 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 concave near the optical axis; The fourth lens 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 convex near the optical axis; The fifth lens has positive refractive power, and the object side surface of the fifth lens is convex near the optical axis; The sixth lens has negative refractive power, the object side surface of the sixth lens is convex near the optical axis, and the image side surface of the sixth lens is concave near the optical axis; The optical system satisfies the relationship: 1.9 < FNO < 2.2, 87deg < FOV < 95deg, 1.2 < TTL / ImgH < 1.35, -7 < f4 / f < -1; Where, FNO is the f-number of the optical system, FOV is the maximum field angle of the optical system, TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the optical system, ImgH is half of the image height corresponding to the maximum field angle of the optical system, f4 is the effective focal length of the fourth lens, and f is the effective focal length of the optical system.

2. The optical system as described in claim 1, characterized in that, The optical system satisfies the relationship: 0.6 < R11 / f < 1, and / or -1 < R12 / f < -0.6, and / or 7 < |R21| / f, and / or 0.7 < R22 / f < 1.2, and / or 0.6 < R31 / f < 1.1, and / or 0.7 < R32 / f < 1.1, and / or -0.9 < R41 / f < -0.35, and / or -1.9 < R42 / f < -0.5, and / or 0.3 < R51 / f < 0.7, and / or 3 < |R52| / f < 30, and / or 0.3 < R61 / f < 0.6, and / or 0.15 < R62 / f < 0.35, and / or 1 < |R32 / R41| < 2, and / or 0.4 < |(R61 + R62) / f6| < 0.7; Where, R11 is the radius of curvature of the object side of the first lens at the optical axis, R12 is the radius of curvature of the image side of the first lens at the optical axis, R21 is the radius of curvature of the object side of the second lens at the optical axis, R22 is the radius of curvature of the image side of the second lens at the optical axis, R31 is the radius of curvature of the object side of the third lens at the optical axis, R32 is the radius of curvature of the image side of the third lens at the optical axis, R41 is the radius of curvature of the object side of the fourth lens at the optical axis, R42 is the radius of curvature of the image side of the fourth lens at the optical axis, R51 is the radius of curvature of the object side of the fifth lens at the optical axis, R52 is the radius of curvature of the image side of the fifth lens at the optical axis, R61 is the radius of curvature of the object side of the sixth lens at the optical axis, R62 is the radius of curvature of the image side of the sixth lens at the optical axis, f is the effective focal length of the optical system, and f6 is the effective focal length of the sixth lens.

3. The optical system as described in claim 1, characterized in that, The optical system satisfies the relationship: 0.65 < f1 / f < 0.85, and / or -1.5 < f2 / f < -1.1, and / or 9 < |f3| / f < 50, and / or 0.6 < f5 / f < 1.1, and / or -1.5 < f6 / f < -1.1; 4. The optical system as claimed in claim 1, characterized in that, Where, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f5 is the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens. The optical system satisfies the relationship: 2.1 < FNO * tan(HFOV) < 2.3, and / or 1.284 ≤ TTL / ImgH ≤ 1.3 5. The optical system as claimed in claim 1, characterized in that, Where, HFOV is half of the maximum field angle of the optical system. The optical system satisfies the relationship: 4 < f / SD11 < 4.3, and / or 6. The optical system as claimed in claim 1, characterized in that, 1.1 < CT1 / SD11 < 1.3; Where, f is the effective focal length of the optical system, CT1 is the thickness of the first lens on the optical axis, and SD11 is the maximum effective aperture of the object side of the first lens. The optical system satisfies the relationship: 0.65 < ET1 / CT1 < 0.8, and / or 1.1 < CT5 / ET5 < 1. ​ ​ ​ Where, CT1 is the thickness of the first lens on the optical axis, CT5 is the thickness of the fifth lens on the optical axis, CT6 is the thickness of the sixth lens on the optical axis, ET1 is the distance on 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 of the first lens, ET5 is the distance on the optical axis from the maximum effective aperture of the object side of the fifth lens to the maximum effective aperture of the image side of the fifth lens, ET6 is the distance on the optical axis from the maximum effective aperture of the object side of the sixth lens to the maximum effective aperture of the image side of the sixth lens, TD is the distance on the optical axis from the object side of the first lens to the image side of the sixth lens, AT56 is the distance on the optical axis from the image side of the fifth lens to the object side of the sixth lens, AT23 is the distance on the optical axis from the image side of the second lens to the object side of the third lens, AT34 is the distance on the optical axis from the image side of the third lens to the object side of the fourth lens, T56max is the maximum distance between the fifth lens and the sixth lens in the direction parallel to the optical axis, and T�6min is the minimum distance between the fifth lens and the sixth lens in the direction parallel to the optical axis.

7. The optical system as claimed in claim 1, characterized in that, The optical system satisfies the relationship: 0.2 < (SAG11 + SAG21) / TTL < 0.3; Where, SAG11 is the distance on the optical axis from the intersection of the object side of the first lens and the optical axis to the maximum effective radius of the image side of the first lens, and SAG21 is the distance on the optical axis from the intersection of the object side of the second lens and the optical axis to the maximum effective radius of the image side of the second lens.

8. The optical system as claimed in claim 1, characterized in that, The optical system satisfies the relationship: 4 < L42 / (W4 + V4) < 5, and / or 4 < L62 / (W6 + V6) < 6; Where, L42 is half of the maximum effective aperture of the image side of the fourth lens, W4 is half of the maximum thickness of the fourth lens, V4 is half of the minimum thickness of the fourth lens, L62 is half of the maximum effective aperture of the image side of the sixth lens, W6 is half of the maximum thickness of the sixth lens, and V6 is half of the minimum thickness of the sixth lens.

9. A camera module, characterized in that, It includes the optical system according to any one of claims 1 to 8 and a photosensitive chip, 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.

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