Optical system, camera module and electronic device

Abstract

An optical system, a camera module, and an electronic device are disclosed. The optical system comprises, along the optical axis from the object side to the image side, lenses numbered eight to one, each possessing refractive power. Lenses three, four, five, six, and eight possess negative refractive power, while lenses four, four, five, six, and eight possess positive refractive power. The image-side surfaces of the first, second, fourth, seventh, and eighth lenses are concave near the optical axis, while the object-side surfaces of the first, third, fourth, fifth, sixth, and eighth lenses are convex near the optical axis. By rationally designing the surface shape and refractive power of each lens in the optical system, it is beneficial to meet the requirements of miniaturization, large aperture, high resolution, high illumination, and a wide field of view.

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] With the rapid iteration of vehicle intelligence and connectivity, advanced driver assistance systems and autonomous driving systems are placing increasingly higher demands on the performance of onboard vision sensors.

[0003] As a core component of the visual perception system, the image quality of automotive lenses directly affects the reliability of the entire system and driving safety. Traditional automotive lenses (especially wide-angle lenses used in surround-view and rear-view scenarios) face multiple technical challenges when adapting to the requirements of high-level autonomous driving. These challenges include insufficient resolution leading to inaccurate image recognition, difficulty in balancing miniaturization and high performance, poor adaptability to complex environments, and significant ghosting and stray light interference that can interfere with image recognition algorithms and even cause system misjudgments. Therefore, the market urgently needs a lens that combines miniaturization and a large aperture with high resolution, high illumination, and a wide field of view. Summary of the Invention

[0004] The purpose of this invention is to provide an optical system, camera module, and electronic device that solves the problem of automotive optical systems needing to achieve high resolution, high illumination, and a wide field of view while also possessing miniaturization and large aperture characteristics.

[0005] To achieve the objectives of this invention, the following technical solution is provided: In a first aspect, the present invention provides an optical system comprising eight lenses with refractive power, arranged sequentially along the optical axis from the object side to the image side: a first lens having negative refractive power, wherein the object side of the first lens is convex near the optical axis and the image side of the first lens is concave near the optical axis; a second lens having negative refractive power, wherein the object side of the second lens is concave near the optical axis and the image side of the second lens is concave near the optical axis; a third lens having positive refractive power, wherein 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; and a fourth lens having positive refractive power, wherein the object side of the fourth lens is convex near the optical axis and the image side of the fourth lens is concave near the optical axis; and a fourth lens having positive refractive power, wherein the object side of the fourth lens is convex near the optical axis and the image side of the fourth lens is concave near the optical axis. The fourth lens has a convex surface near the optical axis, while the image-side surface of the fifth lens is concave near the optical axis. The fifth lens has positive refractive power, with both its object-side and image-side surfaces convex near the optical axis. The sixth lens has positive refractive power, with both its object-side and image-side surfaces convex near the optical axis. The seventh lens has negative refractive power, with both its object-side and image-side surfaces concave near the optical axis. The eighth lens has positive refractive power, with both its object-side and image-side surfaces convex near the optical axis.

[0006] The optical system satisfies the following relationships: 120deg≤FOV≤150deg, 1.3≤FNO≤1.6; where FOV is the maximum field of view of the optical system and FNO is the aperture number of the optical system.

[0007] By making the first lens have negative refractive power, and the object-side surface of the first lens is convex near the optical axis, while the image-side surface of the first lens is concave near the optical axis, it is beneficial to efficiently collect incident light rays with a large field of view, thereby increasing the field of view of the fixed-focus lens; by making the second lens have negative refractive power, and the object-side surface of the second lens is concave near the optical axis, while the image-side surface of the second lens is concave near the optical axis, it is beneficial to further expand the field of view and effectively correct the astigmatism generated by the first lens, controlling the angle of the principal ray; by making the third lens... The third lens has positive refractive power, and both its object-side and image-side surfaces are convex near the optical axis. This allows it to converge the diverging light rays from the front lens group, compressing the system aperture and providing conditions for achieving a large aperture. By making the fourth lens have positive refractive power, and its object-side surface is convex near the optical axis while its image-side surface is concave near the optical axis, it helps to balance the field curvature generated by the front lens group, making the light spot more convergent and improving image quality. Furthermore, by making the fifth and sixth lenses… All lenses possess positive refractive power. The object-side surfaces of both the fifth and sixth lenses are convex near the optical axis, as are their image-side surfaces. Working together, they form a powerful positive optical power combination, which facilitates efficient light convergence, reduces optical path length, and enables miniaturization of the optical system. The sixth lens, as the core converging lens, significantly reduces system sensitivity and corrects axial aberrations when combined with the fifth lens. The seventh lens possesses negative refractive power, with both its object-side and image-side surfaces concave near the optical axis. This facilitates precise correction of field curvature and distortion in the optical system, while also compensating for magnification chromatic aberration and improving image quality at the edges. The eighth lens possesses positive refractive power, with both its object-side and image-side surfaces convex near the optical axis. This further converges light, reduces the principal ray incident angle, improves the uniformity of illumination on the imaging surface, and, in conjunction with the seventh lens, ultimately balances and corrects various aberrations.

[0008] By ensuring that the optical system satisfies the relationship 120deg≤FOV≤150deg, the maximum field of view of the optical system is controlled within a reasonable range, which avoids the introduction of excessive aberrations and helps the optical system to achieve miniaturization while obtaining a sufficient field of view.

[0009] By ensuring that the optical system satisfies the relationship 1.3≤FNO≤1.6, the aperture number of the optical system is set within a reasonable range, thereby improving the light transmission capability of the optical system and increasing its relative illumination. This allows the optical system to have good imaging quality even in dark environments such as at night or on rainy days, meeting the requirements of large aperture and high resolution.

[0010] In one embodiment, the optical system satisfies the relationship: 6.2 ≤ TTL / F ≤ 7.6; where TTL is the distance on the optical axis from the object side of the first lens to the imaging plane, and F is the effective focal length of the optical system. By ensuring that the optical system satisfies the above relationship, the ratio of the total optical length to the effective focal length of the optical system is constrained, ensuring that the optical system has a small total optical length while maintaining the effective focal length. This achieves miniaturization, improves lens resolution, and reduces lens sensitivity.

[0011] In one embodiment, the optical system satisfies the relationship: 6.4 ≤ TTL / IMGH ≤ 7.8; where IMGH is half the image height corresponding to the maximum field of view of the optical system. By ensuring that the optical system satisfies the above relationship, under a certain image height, by controlling the ratio of the focal length of the optical system to the image height corresponding to the maximum field of view of the optical system within a reasonable range, a large image plane characteristic can be achieved while better compressing the overall length of the lens, enabling the lens design to be miniaturized and easily mounted on other imaging devices.

[0012] In one embodiment, the optical system satisfies the relationship: 9 ≤ TTL / BFL ≤ 18.5; where BFL is the distance on the optical axis from the image-side surface of the eighth lens to the imaging surface of the optical system. By making the optical system satisfy the above relationship, it is beneficial to achieve a balance between obtaining good imaging quality and the distance on the optical axis from the object-side surface of the first lens to the imaging surface of the optical system, resulting in a smaller overall optical length and miniaturization.

[0013] In one embodiment, the optical system satisfies the relationship: 1.9 ≤ F3 / F ≤ 2.6; where F3 is the effective focal length of the third lens, and F is the effective focal length of the optical system. Since light is emitted from the first and second lenses, which have strong refractive power, this often leads to significant field curvature when edge field rays enter the imaging plane. By ensuring the optical system satisfies the above relationship and appropriately setting the effective focal length of the third lens, the incident light rays can be effectively collected and compressed, allowing the light to smoothly transition to the rear optical system, reducing aberrations, and thus improving the image quality of the lens.

[0014] In one embodiment, the second and third lenses are cemented together, and the optical system satisfies the relationship: -12 ≤ F23 / F ≤ -8; where F23 is the combined effective focal length of the second and third lenses. By ensuring that the optical system satisfies the above relationship and rationally matching the combined effective focal length of the cemented second and third lenses, it is beneficial to correct chromatic aberration and balance various aberrations, improve resolution, effectively reduce tolerance sensitivity, and enhance the imaging quality of the optical system.

[0015] In one embodiment, the optical system satisfies the relationship: -1≤F2 / F6≤-0.7; where F2 is the effective focal length of the second lens and F6 is the effective focal length of the sixth lens. By ensuring that the optical system satisfies the above relationship, it is beneficial to improve the lens's temperature drift stability, reduce the impact of the environment on the lens group, and also meet the compactness requirements of the lens.

[0016] In one embodiment, the sixth and seventh lenses are cemented together, and the optical system satisfies the relationship: -1.4 ≤ F6 / F7 ≤ -1.2; where F7 is the effective focal length of the seventh lens. By making the optical system satisfy the above relationship, the cementation of the six positive and seven negative lenses, which are of positive and negative optical power respectively, achieves the effect of eliminating chromatic aberration.

[0017] In one embodiment, the optical system satisfies the relationship: 1 ≤ (R1 + R2) / (R1 - R2) ≤ 1.5; where R1 is the radius of curvature of the object-side surface of the first lens at the optical axis, and R2 is the radius of curvature of the image-side surface of the first lens at the optical axis. By ensuring that the optical system satisfies the above relationship, it is beneficial to reasonably control the radii of curvature of the object-side and image-side surfaces of the first lens, thereby effectively controlling the shape of the first lens, allowing the incident light to pass through the first lens more smoothly, and avoiding increased aberrations.

[0018] In one embodiment, the optical system satisfies the following relationship: -0.6 ≤ R3 / (R4+CT2) ≤ -0.3; where R3 is the radius of curvature of the object-side surface of the second lens at the optical axis, R4 is the radius of curvature of the image-side surface of the second lens at the optical axis, and CT2 is the thickness of the second lens along the optical axis. By making the optical system satisfy the above relationship, it is beneficial to make the shape of the second lens close to a concentric circle, which is beneficial to a smooth transition of light path; it is also beneficial to reduce the front diameter of the lens, reduce the lens volume, and facilitate lens miniaturization and cost reduction.

[0019] In one embodiment, the optical system satisfies the relationship: -15 ≤ R14 / R13 ≤ -2; where R13 is the radius of curvature of the object-side surface of the seventh lens at the optical axis, and R14 is the radius of curvature of the image-side surface of the seventh lens at the optical axis. By ensuring that the optical system satisfies the above relationship, the ratio of the radii of curvature of the object-side surface and the image-side surface of the seventh lens is controlled within a certain range, ensuring that ghosting at small ray angles is reduced. When the value is below the lower limit of the relationship, the absolute value of the radius of curvature of the image-side surface of the seventh lens relative to the object-side surface at the optical axis is too large, and the surface shape of the image-side surface of the seventh lens near the optical axis is too flat, which easily produces edge aberrations and is not conducive to improving the image quality of the optical system; when the value exceeds the upper limit of the relationship, the absolute value of the radius of curvature of the image-side surface of the seventh lens relative to the object-side surface at the optical axis is too small, and the surface shape of the image-side surface of the seventh lens at the optical axis is too curved, which is not conducive to the processing and shaping of the lens.

[0020] In one embodiment, the optical system satisfies the relationship: -22≤R1 / F1≤-2; where F1 is the effective focal length of the first lens. By making the optical system satisfy the above relationship, the ratio of the radius of curvature of the image side of the first lens at the optical axis to the effective focal length of the first lens can be reasonably configured, which is beneficial to improving the field of view of the first lens.

[0021] In one embodiment, the optical system satisfies the relationship: -15≤R14 / F7≤-3. By ensuring that the optical system satisfies the above relationship, the ratio of the radius of curvature of the image-side surface of the seventh lens at the optical axis to the effective focal length of the seventh lens can be reasonably configured, which helps to reduce distortion and improve image quality.

[0022] In one embodiment, the optical system satisfies the relationship: 0.25 ≤ (R5 + R6) / F3 ≤ 1; where R5 is the radius of curvature of the object-side surface of the third lens at the optical axis, and R6 is the radius of curvature of the image-side surface of the third lens at the optical axis. By ensuring that the optical system satisfies the above relationship, the incident light rays refracted by the first and second lenses can be effectively collected and compressed, allowing the light rays to smoothly transition into the rear optical lens, reducing aberrations, and improving the imaging quality of the optical system.

[0023] In one embodiment, the optical system satisfies the relationship: 1 ≤ SD8 / SD9 ≤ 1.3; where SD8 is half the maximum effective aperture of the image-side surface of the fourth lens, and SD9 is half the maximum effective aperture of the object-side surface of the fifth lens. By ensuring that the optical system satisfies the above relationship, it is beneficial to reasonably configure the ratio of half the maximum effective aperture of the image-side surface of the fourth lens to half the maximum effective aperture of the object-side surface of the fifth lens. The deflection angle of light rays exiting from the fourth lens and entering the fifth lens is reasonably controlled, which can effectively correct aberrations and improve the assembly yield of the optical system.

[0024] In one embodiment, the optical system satisfies the relationship: 1.35 ≤ SD1 / IMGH ≤ 1.75; where SD1 is half of the maximum effective aperture of the object-side surface of the first lens, and IMGH is half of the image height corresponding to the maximum field of view of the optical system. By ensuring that the optical system satisfies the above relationship, the size of the maximum effective aperture of the object-side surface of the first lens can be reasonably controlled, which is beneficial for achieving miniaturized design of the optical system.

[0025] In one embodiment, the optical system satisfies the relationship: 1.35 ≤ SAG2 / CT1 ≤ 2.65; where SAG2 is the sag at the maximum effective aperture of the image-side surface of the first lens, i.e., the distance from the intersection of the image-side surface of the first lens and the optical axis to the maximum effective aperture of the image-side surface of the first lens in the direction parallel to the optical axis, and CT1 is the thickness of the first lens on the optical axis. By ensuring that the optical system satisfies the above relationship, it is beneficial to rationally configure the ratio of the sag at the maximum effective aperture of the image-side surface of the first lens to the thickness of the first lens on the optical axis, which is beneficial to controlling the lens profile of the image-side surface of the first lens, allowing more light to enter the optical system, and achieving high-pixel imaging of the optical system.

[0026] In one embodiment, the optical system satisfies the relationship: 0.7 ≤ CT2 / CT3 ≤ 1.1; where CT3 is the thickness of the third lens along the optical axis. By making the optical system satisfy the above relationship, the ratio of the thickness of the second lens along the optical axis to the thickness of the third lens along the optical axis can be reasonably configured, and the second and third lenses can be mutually adjusted to maintain the miniaturized characteristics of the optical system.

[0027] In one embodiment, the optical system satisfies the relationship: 0.85 ≤ CT5 / CT6 ≤ 1.45; where CT5 is the thickness of the fifth lens along the optical axis, and CT6 is the thickness of the sixth lens along the optical axis. By ensuring that the optical system satisfies the above relationship, the ratio of the thickness of the fifth lens along the optical axis to the thickness of the sixth lens along the optical axis can be reasonably configured, allowing the fifth and sixth lenses to be mutually adjustable and maintaining the miniaturized characteristics of the optical system.

[0028] In one embodiment, the optical system satisfies the relationship: 4≤R16 / CT8≤16; where R16 is the radius of curvature of the image-side surface of the eighth lens at the optical axis, and CT8 is the thickness of the eighth lens at the optical axis. By ensuring that the optical system satisfies the above relationship, it is beneficial to control the shape of the eighth lens, comprehensively balance the spherical aberration, chromatic aberration, and field curvature of the optical system, reduce the risk of ghosting, and improve the resolving power of the optical system.

[0029] In one embodiment, the optical system satisfies the relationship: 80deg≤FOV / FNO≤105deg; where FOV is the maximum field of view of the optical system, and FNO is the aperture number of the optical system. By ensuring that the optical system satisfies the above relationship, the ratio of the field of view to the aperture number of the optical system can be reasonably configured, allowing it to match different aperture sizes. This better balances the relationship between the field of view and aperture size of a fixed-focus lens, achieving a combination of a large field of view and a large aperture. The optical system also has a reasonable amount of light intake, improving the overall illuminance of the image and making the optical system suitable for different lighting environments.

[0030] In one implementation, the optical system satisfies the relationship: 120deg ≤ ≤150deg. By ensuring the optical system satisfies the above relationship, it is beneficial to achieve a large image height while maintaining a large field of view. This facilitates matching with larger image sensors and improves the imaging quality of the optical system. Below the lower limit of the relationship, the maximum field of view of the optical system is too small, failing to meet the field of view required by the camera module; above the upper limit of the relationship, the image height corresponding to the maximum field of view of the optical system is too small, making it difficult to match with large image sensors, resulting in vignetting and reduced image quality.

[0031] In one embodiment, the optical system satisfies the following relationship: 1.7 ≤ ∑CT / ∑AT ≤ 2.3; where ∑CT is the sum of the thicknesses of the first to eighth lenses along the optical axis, and ∑AT is the sum of the air gaps between adjacent lenses along the optical axis. By ensuring the optical system satisfies the above relationship and by rationally configuring the air gaps, it is beneficial to shorten the step differences between the lenses in the optical system, facilitate the support design of the lenses, and improve the assembly yield of the optical system.

[0032] Secondly, the present invention also provides a camera module, which includes a photosensitive chip and an optical system according to any embodiment of the first aspect, wherein the photosensitive chip is disposed on the image side of the optical system. The photosensitive surface of the photosensitive chip is located on the imaging surface of the optical system, and light rays from an object incident on the photosensitive surface through a lens can be converted into electrical signals for an image. The photosensitive chip can be a complementary metal-oxide-semiconductor (CMOS) or a charge-coupled device (CCD). The camera module can be an imaging module integrated into an electronic device or a standalone lens. By incorporating the optical system provided by the present invention into the camera module, the camera module can achieve miniaturization, a large aperture, higher resolution, and a wider field of view through reasonable design of the surface shape and refractive power of each lens in the optical system.

[0033] Thirdly, the present invention also provides an electronic device, which includes a housing and a camera module as described in the second aspect, the camera module being disposed within the housing. This electronic device includes, but is not limited to, automobiles, surveillance equipment, smartphones, computers, and smartwatches. By incorporating the camera module provided by the present invention into the electronic device, the device achieves miniaturization, a large aperture, higher resolution, and a wider field of view. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the optical system of the first embodiment; Figure 2 The diagrams showing the longitudinal spherical aberration, astigmatism, and distortion curves of the optical system of the first embodiment are illustrated. Figure 3 This is a schematic diagram of the optical system of the second embodiment; Figure 4 The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system of the second embodiment are shown. Figure 5 This is a schematic diagram of the optical system of the third embodiment; Figure 6 The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system of the third embodiment are shown. Figure 7 This is a schematic diagram of the optical system of the fourth embodiment; Figure 8 The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system of the fourth embodiment are shown. Figure 9 This is a schematic diagram of the optical system of the fifth embodiment; Figure 10 The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system of the fifth embodiment are shown. Figure 11 A schematic diagram of the camera module structure in one embodiment of the present invention is shown; Figure 12 A schematic diagram of the structure of an electronic device according to one embodiment of the present invention is shown. Detailed Implementation

[0036] 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.

[0037] In a first aspect, the present invention provides an optical system comprising eight lenses with refractive power, arranged sequentially along the optical axis from the object side to the image side: a first lens having negative refractive power, wherein the object side of the first lens is convex near the optical axis and the image side of the first lens is concave near the optical axis; a second lens having negative refractive power, wherein the object side of the second lens is concave near the optical axis and the image side of the second lens is concave near the optical axis; a third lens having positive refractive power, wherein 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; and a fourth lens having positive refractive power, wherein the object side of the fourth lens is convex near the optical axis and the image side of the fourth lens is concave near the optical axis; and a fourth lens having positive refractive power, wherein the object side of the fourth lens is convex near the optical axis and the image side of the fourth lens is concave near the optical axis. The fourth lens has a convex surface near the optical axis, while the image-side surface of the fifth lens is concave near the optical axis. The fifth lens has positive refractive power, with both its object-side and image-side surfaces convex near the optical axis. The sixth lens has positive refractive power, with both its object-side and image-side surfaces convex near the optical axis. The seventh lens has negative refractive power, with both its object-side and image-side surfaces concave near the optical axis. The eighth lens has positive refractive power, with both its object-side and image-side surfaces convex near the optical axis.

[0038] The optical system satisfies the following relationships: 120deg ≤ FOV ≤ 150deg, 1.3 ≤ FNO ≤ 1.6; where FOV is the maximum field of view of the optical system, and FNO is the aperture number of the optical system. Specifically, the value of FOV can be 120deg, 122deg, 125deg, 128deg, 130deg, 135deg, 140deg, 145deg, 150deg, etc. Specifically, the value of FNO can be 1.312, 1.329, 1.346, 1.465, 1.489, 1.515, 1.535, 1.577, etc.

[0039] By making the first lens have negative refractive power, and the object-side surface of the first lens is convex near the optical axis, while the image-side surface of the first lens is concave near the optical axis, it is beneficial to efficiently collect incident light rays with a large field of view, thereby increasing the field of view of the fixed-focus lens; by making the second lens have negative refractive power, and the object-side surface of the second lens is concave near the optical axis, while the image-side surface of the second lens is concave near the optical axis, it is beneficial to further expand the field of view and effectively correct the astigmatism generated by the first lens, controlling the angle of the principal ray; by making the third lens... The third lens has positive refractive power, and both its object-side and image-side surfaces are convex near the optical axis. This allows it to converge the diverging light rays from the front lens group, compressing the system aperture and providing conditions for achieving a large aperture. By making the fourth lens have positive refractive power, and its object-side surface is convex near the optical axis while its image-side surface is concave near the optical axis, it helps to balance the field curvature generated by the front lens group, making the light spot more convergent and improving image quality. Furthermore, by making the fifth and sixth lenses… All lenses possess positive refractive power. The object-side surfaces of both the fifth and sixth lenses are convex near the optical axis, as are their image-side surfaces. Working together, they form a powerful positive optical power combination, which facilitates efficient light convergence, reduces optical path length, and enables miniaturization of the optical system. The sixth lens, as the core converging lens, significantly reduces system sensitivity and corrects axial aberrations when combined with the fifth lens. The seventh lens possesses negative refractive power, with both its object-side and image-side surfaces concave near the optical axis. This facilitates precise correction of field curvature and distortion in the optical system, while also compensating for magnification chromatic aberration and improving image quality at the edges. The eighth lens possesses positive refractive power, with both its object-side and image-side surfaces convex near the optical axis. This further converges light, reduces the principal ray incident angle, improves the uniformity of illumination on the imaging surface, and, in conjunction with the seventh lens, ultimately balances and corrects various aberrations.

[0040] By ensuring that the optical system satisfies the relationship 120deg≤FOV≤150deg, the maximum field of view of the optical system is controlled within a reasonable range, which avoids the introduction of excessive aberrations and helps the optical system to achieve miniaturization while obtaining a sufficient field of view.

[0041] By ensuring that the optical system satisfies the relationship 1.3≤FNO≤1.6, the aperture number of the optical system is set within a reasonable range, thereby improving the light transmission capability of the optical system and increasing its relative illumination. This allows the optical system to have good imaging quality even in dark environments such as at night or on rainy days, meeting the requirements of large aperture and high resolution.

[0042] In one embodiment, the optical system satisfies the relationship: 6.2 ≤ TTL / F ≤ 7.6; where TTL is the distance on the optical axis from the object-side surface of the first lens to the imaging plane, and F is the effective focal length of the optical system. Specifically, the value of TTL / F can be 6.213, 6.287, 6.394, 6.508, 6.627, 6.745, 6.869, 7.502, etc. By ensuring that the optical system satisfies the above relationship, the ratio of the total optical length to the effective focal length of the optical system is constrained, ensuring that the optical system has a small total optical length while maintaining the effective focal length. This achieves miniaturization, improves lens resolution, and reduces lens sensitivity.

[0043] In one embodiment, the optical system satisfies the relationship: 6.4 ≤ TTL / IMGH ≤ 7.8; where IMGH is half the image height corresponding to the maximum field of view of the optical system. Specifically, the value of TTL / IMGH can be 6.427, 6.583, 6.694, 6.812, 6.935, 7.063, 7.191, 7.706, etc. By ensuring the optical system satisfies the above relationship, under a certain image height, by controlling the ratio of the focal length of the optical system to the image height corresponding to the maximum field of view of the optical system within a reasonable range, a large image plane characteristic can be achieved while better compressing the overall length of the lens, enabling miniaturization of the lens design and facilitating its mounting on other imaging devices.

[0044] In one embodiment, the optical system satisfies the relationship: 9 ≤ TTL / BFL ≤ 18.5; where BFL is the distance on the optical axis from the image-side surface of the eighth lens to the imaging surface of the optical system. Specifically, the value of TTL / BFL can be 9.127, 10.834, 12.562, 13.915, 15.203, 16.478, 17.392, 18.124, etc. By ensuring the optical system satisfies the above relationship, it is beneficial to achieve a balance between obtaining good imaging quality and the distance on the optical axis from the object-side surface of the first lens to the imaging surface of the optical system, resulting in a smaller overall optical length and miniaturization.

[0045] In one embodiment, the optical system satisfies the relationship: 1.9 ≤ F3 / F ≤ 2.6; 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 1.927, 2.031, 2.145, 2.248, 2.369, 2.471, 2.558, 2.593, etc. Since the light is emitted from the first and second lenses, which have strong refractive power, this often leads to significant field curvature when light rays from the edge of the field of view enter the imaging plane. By ensuring the optical system satisfies the above relationship and appropriately setting the effective focal length of the third lens, the incident light rays can be effectively collected and compressed, allowing the light to smoothly transition to the rear optical system, reducing aberrations, and thus improving the image quality of the lens.

[0046] In one embodiment, the optical system satisfies the relationship: -12 ≤ F23 / F ≤ -8; where F23 is the combined effective focal length of the second and third lenses. Specifically, the value of F23 / F can be -11.873, -11.426, -10.951, -10.327, -9.814, -9.256, -8.693, -8.142, etc. By ensuring the optical system satisfies the above relationship and rationally matching the combined effective focal length of the cemented lens of the second and third lenses, it is beneficial to correct chromatic aberration and balance various aberrations, improve resolution, effectively reduce tolerance sensitivity, and enhance the imaging quality of the optical system.

[0047] In one embodiment, the optical system satisfies the relationship: -1 ≤ F2 / F6 ≤ -0.7; where F2 is the effective focal length of the second lens and F6 is the effective focal length of the sixth lens. Specifically, the value of F2 / F6 can be -0.987, -0.941, -0.892, -0.854, -0.812, -0.775, -0.734, -0.712, etc. By ensuring the optical system satisfies the above relationship, it is beneficial to improve the lens's temperature drift stability, help reduce the impact of the environment on the lens group, and also meet the compactness requirements of the lens.

[0048] In one embodiment, the optical system satisfies the relationship: -1.4 ≤ F6 / F7 ≤ -1.2; where F7 is the effective focal length of the seventh lens. Specifically, the values ​​of F6 / F7 can be -1.387, -1.361, -1.334, -1.308, -1.279, -1.251, -1.224, -1.203, etc. By ensuring the optical system satisfies the above relationship, the cementation of the sixth positive lens and the seventh negative lens, two lenses with different optical powers, achieves the effect of eliminating chromatic aberration.

[0049] In one embodiment, the optical system satisfies the relationship: 1 ≤ (R1 + R2) / (R1 - R2) ≤ 1.5; where R1 is the radius of curvature of the object-side surface of the first lens at the optical axis, and R2 is the radius of curvature of the image-side surface of the first lens at the optical axis. Specifically, the value of (R1 + R2) / (R1 - R2) can be 1.023, 1.087, 1.154, 1.221, 1.289, 1.354, 1.421, 1.486, etc. By ensuring the optical system satisfies the above relationship, it is beneficial to reasonably control the radii of curvature of the object-side and image-side surfaces of the first lens, thereby effectively controlling the shape of the first lens, allowing the incident light to pass through the first lens more smoothly, and avoiding increased aberrations.

[0050] In one embodiment, the optical system satisfies the relationship: -0.6 ≤ R3 / (R4+CT2) ≤ -0.3; where R3 is the radius of curvature of the object-side surface of the second lens at the optical axis, R4 is the radius of curvature of the image-side surface of the second lens at the optical axis, and CT2 is the thickness of the second lens along the optical axis. Specifically, the value of R3 / (R4+CT2) can be -0.587, -0.541, -0.498, -0.452, -0.409, -0.367, -0.324, -0.302, etc. By making the optical system satisfy the above relationship, it is beneficial to make the shape of the second lens close to a concentric circle, which is beneficial to the smooth transition of light path; it is also beneficial to reduce the front diameter of the lens, reduce the lens volume, and facilitate lens miniaturization and cost reduction.

[0051] In one embodiment, the optical system satisfies the relationship: -15 ≤ R14 / R13 ≤ -2; where R13 is the radius of curvature of the object-side surface of the seventh lens at the optical axis, and R14 is the radius of curvature of the image-side surface of the seventh lens at the optical axis. Specifically, the values ​​of R14 / R13 can be -14.627, -12.893, -10.546, -8.372, -6.215, -4.683, -3.291, -2.138, etc. By ensuring that the optical system satisfies the above relationship, the ratio of the radii of curvature of the object-side surface and the image-side surface of the seventh lens is controlled within a certain range, ensuring that ghosting at small ray angles is reduced. Below this relationship, the absolute value of the radius of curvature of the object-side surface of the seventh lens at the optical axis is too small, resulting in excessive curvature of the object-side surface, which is detrimental to processing and shaping.

[0052] In one embodiment, the optical system satisfies the relationship: -22 ≤ R1 / F1 ≤ -2; where F1 is the effective focal length of the first lens. Specifically, the value of R1 / F1 can be -21.346, -18.572, -15.837, -12.964, -9.821, -6.735, -4.283, -2.157, etc. By ensuring the optical system satisfies the above relationship, the ratio of the radius of curvature of the image-side surface of the first lens at the optical axis to the effective focal length of the first lens can be reasonably configured, which is beneficial to improving the field of view of the first lens.

[0053] In one embodiment, the optical system satisfies the relationship: -15 ≤ R14 / F7 ≤ -3. Specifically, the value of R14 / F7 can be -14.628, -12.847, -10.935, -8.724, -6.513, -4.892, -3.746, -3.051, etc. By ensuring the optical system satisfies the above relationship, the ratio of the radius of curvature of the image-side surface of the seventh lens at the optical axis to the effective focal length of the seventh lens can be reasonably configured, which helps to reduce distortion and improve image quality.

[0054] In one embodiment, the optical system satisfies the relationship: 0.25 ≤ (R5 + R6) / F3 ≤ 1; where R5 is the radius of curvature of the object-side surface of the third lens at the optical axis, and R6 is the radius of curvature of the image-side surface of the third lens at the optical axis. Specifically, the value of (R5 + R6) / F3 can be 0.287, 0.361, 0.448, 0.532, 0.627, 0.739, 0.854, 0.963, etc.

[0055] In one embodiment, the optical system satisfies the relationship: 1 ≤ SD8 / SD9 ≤ 1.3; where SD8 is half the maximum effective aperture of the image-side surface of the fourth lens, and SD9 is half the maximum effective aperture of the object-side surface of the fifth lens. Specifically, the values ​​of SD8 / SD9 can be 1.017, 1.043, 1.086, 1.124, 1.168, 1.205, 1.251, 1.289, etc. By ensuring the optical system satisfies the above relationship, it is beneficial to reasonably configure the ratio of half the maximum effective aperture of the image-side surface of the fourth lens to half the maximum effective aperture of the object-side surface of the fifth lens. This allows for reasonable control of the refraction angle of light rays exiting the fourth lens and entering the fifth lens, effectively correcting aberrations and improving the assembly yield of the optical system.

[0056] In one embodiment, the optical system satisfies the relationship: 1.35 ≤ SD1 / IMGH ≤ 1.75; where SD1 is half the maximum effective aperture of the object-side surface of the first lens, and IMGH is half the image height corresponding to the maximum field of view of the optical system. Specifically, the value of SD1 / IMGH can be 1.368, 1.417, 1.473, 1.529, 1.584, 1.631, 1.689, 1.742, etc. By ensuring that the optical system satisfies the above relationship, the size of the maximum effective aperture of the object-side surface of the first lens can be reasonably controlled, which is beneficial for achieving miniaturized design of the optical system.

[0057] In one embodiment, the optical system satisfies the relationship: 1.35 ≤ SAG2 / CT1 ≤ 2.65; where SAG2 is the sag at the maximum effective aperture of the image-side surface of the first lens, and CT1 is the thickness of the first lens along the optical axis. Specifically, the value of SAG2 / CT1 can be 1.397, 1.546, 1.729, 1.913, 2.104, 2.281, 2.467, 2.623, etc. By ensuring the optical system satisfies the above relationship, it is beneficial to rationally configure the ratio of the sag at the maximum effective aperture of the image-side surface of the first lens to the thickness of the first lens along the optical axis. This facilitates control of the lens profile of the image-side surface of the first lens, allowing more light to enter the optical system and achieving high-pixel imaging.

[0058] In one embodiment, the optical system satisfies the relationship: 0.7 ≤ CT2 / CT3 ≤ 1.1; where CT3 is the thickness of the third lens along the optical axis. Specifically, the value of CT2 / CT3 can be 0.718, 0.769, 0.825, 0.887, 0.946, 1.008, 1.057, 1.094, etc. By ensuring the optical system satisfies the above relationship, the ratio of the thickness of the second lens along the optical axis to the thickness of the third lens along the optical axis can be reasonably configured, allowing the second and third lenses to be mutually adjustable and maintaining the miniaturized characteristics of the optical system.

[0059] In one embodiment, the optical system satisfies the relationship: 0.85 ≤ CT5 / CT6 ≤ 1.45; where CT5 is the thickness of the fifth lens along the optical axis, and CT6 is the thickness of the sixth lens along the optical axis. Specifically, the value of CT5 / CT6 can be 0.873, 0.942, 1.018, 1.097, 1.176, 1.251, 1.328, 1.419, etc. By ensuring the optical system satisfies the above relationship, the ratio of the thickness of the fifth lens along the optical axis to the thickness of the sixth lens along the optical axis can be reasonably configured, allowing the fifth and sixth lenses to be mutually adjustable and maintaining the miniaturized characteristics of the optical system.

[0060] In one embodiment, the optical system satisfies the relationship: 4 ≤ R16 / CT8 ≤ 16; where R16 is the radius of curvature of the image-side surface of the eighth lens at the optical axis, and CT8 is the thickness of the eighth lens at the optical axis. Specifically, the value of R16 / CT8 can be 4.326, 6.015, 7.892, 9.647, 11.283, 13.058, 14.792, 15.874, etc. By ensuring that the optical system satisfies the above relationship, it is beneficial to control the shape of the eighth lens, comprehensively balance the spherical aberration, chromatic aberration, and field curvature of the optical system, reduce the risk of ghosting, and improve the resolving power of the optical system.

[0061] In one embodiment, the optical system satisfies the relationship: 80deg ≤ FOV / FNO ≤ 105deg; where FOV is the maximum field of view of the optical system, and FNO is the aperture number of the optical system. Specifically, the values ​​of FOV / FNO can be 82.147deg, 86.392deg, 90.584deg, 94.726deg, 97.813deg, 100.265deg, 103.478deg, 104.612deg, etc. By ensuring that the optical system satisfies the above relationship, the ratio of the field of view to the aperture number of the optical system can be reasonably configured, allowing it to match different aperture sizes. This better balances the relationship between the field of view and aperture size of the fixed-focus lens, achieving a combination effect of a large field of view and a large aperture. The optical system has a reasonable amount of light intake, improving the overall illuminance of the image and making the optical system suitable for different lighting environments.

[0062] In one implementation, the optical system satisfies the relationship: 120deg ≤ ≤150deg. Specifically, The values ​​can be 122.374deg, 127.516deg, 131.825deg, 136.294deg, 140.673deg, 144.158deg, 147.239deg, 149.106deg, etc. By ensuring the optical system satisfies the above relationship, it is beneficial to achieve a large image height while maintaining a large field of view. This facilitates matching with larger image sensors and improves the imaging quality of the optical system. Below the lower limit of the relationship, the maximum field of view of the optical system is too small, failing to meet the field of view required by the camera module; above the upper limit, the image height corresponding to the maximum field of view of the optical system is too small, making it difficult to match with large image sensors, resulting in vignetting and reduced image quality.

[0063] In one embodiment, the optical system satisfies the relationship: 1.7 ≤ ∑CT / ∑AT ≤ 2.3; where ∑CT is the sum of the thicknesses of the first to eighth lenses along the optical axis, and ∑AT is the sum of the air gaps between adjacent lenses along the optical axis. Specifically, the values ​​of ∑CT / ∑AT can be 1.724, 1.798, 1.873, 1.951, 2.038, 2.124, 2.196, 2.285, etc. By ensuring the optical system satisfies the above relationship and by rationally configuring the air gaps, it is beneficial to shorten the step differences between the lenses in the optical system, facilitate the support design of the lenses, and improve the assembly yield of the optical system.

[0064] In one embodiment, the optical system satisfies the relationship: -2.3 ≤ F1 / F ≤ -1.7; where F1 is the effective focal length of the first lens. Specifically, the value of F1 / F can be -2.284, -2.197, -2.108, -2.015, -1.926, -1.849, -1.783, -1.722, etc. By ensuring the optical system satisfies the above relationship, the refractive power of the first lens in the optical system is properly matched, the surface design of the first lens is simpler and more flexible, enabling the first lens to support a larger field of view and a large aperture; at the same time, it also helps to converge the light rays incident from the first lens to the optical system, delay the incident angle of the light rays, reduce aberrations, and simplify the overall aberration correction and image quality balance of the optical system.

[0065] In one embodiment, the optical system satisfies the relationship: -1.6 ≤ F2 / F ≤ -1.2; where F2 is the effective focal length of the second lens. Specifically, the value of F2 / F can be -1.587, -1.536, -1.479, -1.423, -1.368, -1.315, -1.258, -1.223, etc. By ensuring the optical system satisfies the above relationship, the refractive power of the second lens in the optical system is properly matched, the surface design of the second lens is simpler and more flexible, aberrations are reduced, and the overall aberration correction and image quality balance of the optical system are simplified.

[0066] In one embodiment, the optical system satisfies the relationship: 2.8 ≤ F4 / F ≤ 4; where F4 is the effective focal length of the fourth lens. Specifically, the value of F4 / F can be 2.837, 2.964, 3.106, 3.259, 3.417, 3.582, 3.748, 3.925, etc. By ensuring the optical system satisfies the above relationship, the refractive power of the fourth lens in the optical system is properly matched, the surface design of the fourth lens is simpler and more flexible, aberrations are reduced, and the overall aberration correction and image quality balance of the optical system are simplified.

[0067] In one embodiment, the optical system satisfies the relationship: 2.9 ≤ F5 / F ≤ 3.4; where F5 is the effective focal length of the fifth lens. Specifically, the value of F5 / F can be 2.917, 2.986, 3.058, 3.137, 3.218, 3.289, 3.345, 3.382, etc. By ensuring the optical system satisfies the above relationship, the refractive power of the fifth lens in the optical system is properly matched, the surface design of the fifth lens is simpler and more flexible, aberrations are reduced, and the overall aberration correction and image quality balance of the optical system are simplified.

[0068] In one embodiment, the optical system satisfies the relationship: 1.5 ≤ F6 / F ≤ 2; where F6 is the effective focal length of the sixth lens. Specifically, the value of F6 / F can be 1.527, 1.594, 1.668, 1.739, 1.813, 1.876, 1.942, 1.969, etc. By ensuring the optical system satisfies the above relationship, the refractive power of the sixth lens in the optical system is properly matched, the surface design of the sixth lens is simpler and more flexible, aberrations are reduced, and the overall aberration correction and image quality balance of the optical system are simplified.

[0069] In one embodiment, the optical system satisfies the relationship: -1.6 ≤ F7 / F ≤ -1.1; where F7 is the effective focal length of the seventh lens. Specifically, the value of F7 / F can be -1.587, -1.541, -1.492, -1.437, -1.378, -1.319, -1.263, -1.119, etc. By ensuring the optical system satisfies the above relationship, the refractive power of the seventh lens in the optical system is properly matched, the surface design of the seventh lens is simpler and more flexible, aberrations are reduced, and the overall aberration correction and image quality balance of the optical system are simplified.

[0070] In one embodiment, the optical system satisfies the relationship: 4 ≤ F8 / F ≤ 5.8; where F8 is the effective focal length of the eighth lens. Specifically, the value of F8 / F can be 4.126, 4.347, 4.583, 4.816, 5.042, 5.284, 5.527, 5.724, etc. By ensuring the optical system satisfies the above relationship and rationally setting the effective focal length of the eighth lens, it is beneficial to achieve proper coordination of the refractive power of the eighth lens within the optical system. This makes the surface design of the eighth lens simpler and more flexible, reduces aberrations, and simplifies the overall aberration correction and image quality balance of the optical system.

[0071] In one embodiment, the optical system satisfies the relationship: 5 ≤ R1 / R2 ≤ 40; where R1 is the radius of curvature of the object-side surface of the first lens at the optical axis, and R2 is the radius of curvature of the image-side surface of the first lens at the optical axis. Specifically, the values ​​of R1 / R2 can be 5.827, 9.164, 14.395, 19.628, 25.013, 30.456, 35.192, 38.674, etc. By ensuring the optical system satisfies the above relationship, it is beneficial to rationally configure the ratio of the radius of curvature of the object-side surface of the first lens at the optical axis to that of the image-side surface 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, reduce the risk of ghosting, improve the resolving power of the optical system, and also help reduce the manufacturing difficulty of the first lens.

[0072] In one embodiment, the optical system satisfies the relationship: -0.7 ≤ R3 / R4 ≤ -0.3; where R3 is the radius of curvature of the object-side surface of the second lens at the optical axis, and R4 is the radius of curvature of the image-side surface of the second lens at the optical axis. Specifically, the value of R3 / R4 can be -0.687, -0.642, -0.591, -0.538, -0.479, -0.426, -0.371, -0.329, etc. By ensuring the optical system satisfies the above relationship, it is beneficial to rationally configure the ratio of the radius of curvature of the object-side surface of the second lens at the optical axis to that of the image-side surface of the second lens at 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 resolving power of the optical system, and also help reduce the manufacturing difficulty of the second lens.

[0073] In one embodiment, the optical system satisfies the relationship: -2.1 ≤ R5 / R6 ≤ -1.2; where R5 is the radius of curvature of the object-side surface of the third lens at the optical axis, and R6 is the radius of curvature of the image-side surface of the third lens at the optical axis. Specifically, the values ​​of R5 / R6 can be -2.027, -1.946, -1.813, -1.674, -1.538, -1.401, -1.285, -1.236, etc. By ensuring that the optical system satisfies the above relationship, it is beneficial to rationally configure the ratio of the radius of curvature of the object-side surface of the third lens at the optical axis to that of the image-side surface of the third lens at 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 resolving power of the optical system, and also help reduce the manufacturing difficulty of the third lens.

[0074] In one embodiment, the optical system satisfies the relationship: 0 < R7 / R8 ≤ 0.3; where R7 is the radius of curvature of the object-side surface of the fourth lens at the optical axis, and R8 is the radius of curvature of the image-side surface of the fourth lens at the optical axis. Specifically, the values ​​of R7 / R8 can be 0.027, 0.064, 0.102, 0.146, 0.183, 0.224, 0.261, 0.284, etc. By ensuring the optical system satisfies the above relationship, it is beneficial to rationally configure the ratio of the radius of curvature of the object-side surface of the fourth lens at the optical axis to that of the image-side surface of the fourth lens at the optical axis, control the shape of the fourth lens, comprehensively balance the spherical aberration, chromatic aberration, and field curvature of the optical system, reduce the risk of ghosting, improve the resolving power of the optical system, and also help reduce the manufacturing difficulty of the fourth lens.

[0075] In one embodiment, the optical system satisfies the relationship: -0.6 ≤ R9 / R10 ≤ -0.3; 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 -0.577, -0.542, -0.496, -0.451, -0.408, -0.364, -0.321, -0.316, etc. By ensuring the optical system satisfies the above relationship, 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 that 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, reduce the risk of ghosting, improve the resolving power of the optical system, and also help reduce the manufacturing difficulty of the fifth lens.

[0076] In one embodiment, the optical system satisfies the relationship: -3.5 ≤ R11 / R12 ≤ -1.5; where R11 is the radius of curvature of the object-side surface of the sixth lens at the optical axis, and R12 is the radius of curvature of the image-side surface of the sixth lens at the optical axis. Specifically, the values ​​of R11 / R12 can be -3.428, -3.094, -2.731, -2.365, -2.016, -1.798, -1.613, -1.529, etc. By ensuring that the optical system satisfies the above relationship, it is beneficial to rationally configure the ratio of the radius of curvature of the object-side surface of the sixth lens at the optical axis to that of the image-side surface of the sixth lens at the optical axis, control the shape of the sixth lens, comprehensively balance the spherical aberration, chromatic aberration, and field curvature of the optical system, reduce the risk of ghosting, improve the resolving power of the optical system, and at the same time, reduce the manufacturing difficulty of the sixth lens.

[0077] In one embodiment, the optical system satisfies the relationship: 0.2 ≤ R15 / R16 ≤ 0.7; where R15 is the radius of curvature of the object-side surface of the eighth lens at the optical axis, and R16 is the radius of curvature of the image-side surface of the eighth lens at the optical axis. Specifically, the value of R16 / R15 can be 0.218, 0.267, 0.319, 0.376, 0.438, 0.497, 0.558, 0.684, etc. By ensuring the optical system satisfies the above relationship, it is beneficial to rationally configure the ratio of the radius of curvature of the image-side surface of the eighth lens at the optical axis to that of the object-side surface of the eighth lens at the optical axis, control the shape of the eighth lens, comprehensively balance the spherical aberration, chromatic aberration, and field curvature of the optical system, reduce the risk of ghosting, improve the resolving power of the optical system, and also help reduce the manufacturing difficulty of the eighth lens.

[0078] In some embodiments, at least one lens in the optical system may have a spherical surface. A spherical surface design reduces the difficulty and cost of lens fabrication. In some embodiments, at least one lens in the optical system may also have an aspherical surface. A lens is said to have an aspherical surface when at least one surface (object-side or image-side) is aspherical. In some embodiments, both the object-side and image-side surfaces of each lens may be designed as aspherical. Aspherical design helps the optical system more effectively eliminate aberrations and improve image quality. In some embodiments, to balance fabrication cost, fabrication difficulty, image quality, and assembly difficulty, the surface design of each lens in the optical system may be a combination of spherical and aspherical surfaces. In this application, the fifth and eighth lenses have aspherical surfaces, while the first, second, third, fourth, sixth, and seventh lenses have spherical surfaces.

[0079] In some embodiments, at least one lens in the optical system is made of glass (GL). For example, the first lens L1 closest to the object side can be made of glass. Utilizing the temperature drift reduction effect of the glass material in the first lens L1, the impact of ambient temperature changes on the optical system can be effectively reduced, thereby maintaining good and stable image quality. In some embodiments, at least one lens in the optical system can also be made of plastic (PC), such as polycarbonate or resin. Lenses made of plastic can reduce the production cost of the optical system, while lenses made of glass can withstand high or low temperatures and have excellent optical performance and better stability. In some embodiments, the optical system can use lenses of different materials, such as a combination of glass and plastic lenses. However, the specific configuration can be determined according to actual needs and will not be exhaustively listed here.

[0080] In some embodiments, the optical system further includes an aperture stop, which may be an aperture stop and / or a field stop, and may be disposed between the image-side surface of the fourth lens and the object-side surface of the fifth lens in the optical system. It is understood that in other embodiments, the aperture stop may also be disposed between other lenses, and the arrangement may be adjusted according to actual conditions; this embodiment does not impose specific limitations.

[0081] In some embodiments, the optical system further includes a filter, which can be disposed between the image-side surface of the eighth lens and the imaging surface of the optical system. Of course, in other embodiments, the filter can also be disposed between other lenses, and the arrangement can be adjusted according to actual conditions; this embodiment does not impose specific limitations. In this embodiment, an infrared cut-off filter can be selected, thereby filtering out light of other wavelengths such as infrared light, allowing only visible light to pass through, making the image more consistent with the visual experience of the human eye. Of course, an infrared bandpass filter can also be selected, thereby filtering out light of other wavelengths such as visible light, allowing only infrared light to pass through. By filtering out light of other wavelengths such as visible light, the image quality is improved; and the optical system can be used as an infrared optical system, that is, the optical system can also image and obtain better image effects in dim environments and other special application scenarios. Preferably, the filter can be made of glass; of course, in other embodiments, the filter can also be made of optical glass with a coating, or a filter of other materials, which can be selected according to actual needs; this embodiment does not impose specific limitations.

[0082] First Embodiment Please refer to Figure 1 The optical system 10 of this embodiment includes, from the object side to the image side along the optical axis: The first lens L1 has negative refractive power. The object side S1 of the first lens L1 is convex near the optical axis, and the image side S2 is concave near the optical axis.

[0083] 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.

[0084] 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 convex near the optical axis.

[0085] The fourth lens L4 has positive refractive power. The object side S7 of the fourth lens L4 is convex near the optical axis, and the image side S8 is concave near the optical axis.

[0086] 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.

[0087] The sixth lens L6 has positive refractive power. The object side S11 of the sixth lens L6 is convex near the optical axis, and the image side S12 is convex near the optical axis.

[0088] The seventh lens L7 has negative refractive power. The object side S13 of the seventh lens L7 is concave near the optical axis, and the image side S14 is concave near the optical axis.

[0089] The eighth lens L8 has positive refractive power. The object side S15 of the eighth lens L8 is convex near the optical axis, and the image side S16 is concave near the optical axis.

[0090] In addition, the optical system 10 also includes an aperture stop STO, a filter IR, and an imaging surface IMG. In this embodiment, the aperture stop STO is disposed between the image-side surface of the fourth lens L4 and the object-side surface of the fifth lens L5 in the optical system 10, and is used to control the amount of light entering the system. The filter IR is disposed between the eighth lens L8 and the imaging surface IMG, and includes an object-side surface S17 and an image-side surface S18. The first lens L1 to the eighth lens L8 are all made of glass. 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.

[0091] Table 1a shows the parameters of the optical system 10 in 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. Focal length, material refractive index, and Abbe number are all obtained using visible light with a reference wavelength of 546 nm. The units for Y-radius, thickness, and effective focal length are all millimeters (mm). Table 1a

[0092] 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 IMGH is half the image height corresponding to the maximum field of view of the optical system 10.

[0093] In this embodiment, both the object-side and image-side surfaces of the fifth lens L5 and the eighth lens L8 are aspherical. The surface shape x of the aspherical surface can be defined using, but is not limited to, the following aspherical formula:

[0094] 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.

[0095] Table 1b gives the higher-order term coefficients A4, A6, A8, A10, A12, A14 and A16 for aspherical surfaces S9 and S10, and aspherical surfaces S15 and S16 that can be used in the first embodiment; Table 1b

[0096] Figure 2 Figure (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, 436.0000 nm, and 410.0000 nm. The horizontal axis along the X-axis represents the focal point shift, i.e., the distance (in mm) from the imaging plane to the intersection of the light ray and the optical axis. The vertical axis along the Y-axis represents the normalized field of view. The longitudinal spherical aberration curves represent the deviation of the converging focal point of light rays of different wavelengths after passing through the lenses of the optical system 10. Figure 2 As can be seen in (a), the convergence focal point deviation of each wavelength of light in the first embodiment tends to be consistent, and the blur spots or color halo in the image are effectively suppressed by the optical system 10, indicating that the imaging quality of the optical system 10 in this embodiment is good.

[0097] Figure 2 Figure (b) also shows an astigmatism curve of the optical system 10 of the first embodiment at a wavelength of 546.0000 nm, where the horizontal axis along the X-axis represents the focus shift and the vertical axis along the Y-axis represents the field of view, both in degrees. 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. Figure 2 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 the edge of the field of view.

[0098] Figure 2 Image (c) also shows the distortion curve of the optical system 10 of the first embodiment at a wavelength of 546.0000 nm. The horizontal axis along the X-axis represents the distortion value, and the vertical axis along the Y-axis represents the field of view, in degrees (deg). The distortion curve represents the distortion magnitude corresponding to different field of view angles. Figure 2 As can be seen in (c), at a wavelength of 546.0000nm, the image distortion caused by the main beam is small, and the imaging quality of the system is excellent.

[0099] Depend on Figure 2 (a) Figure 2 (b) and Figure 2 As can be seen from (c), the optical system 10 of this embodiment has small aberrations, good imaging quality, and excellent imaging performance.

[0100] Second Embodiment Please refer to Figure 3 The optical system 10 of this embodiment includes, from the object side to the image side along the optical axis: The first lens L1 has negative refractive power. The object side S1 of the first lens L1 is convex near the optical axis, and the image side S2 is concave near the optical axis.

[0101] 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.

[0102] 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 convex near the optical axis.

[0103] The fourth lens L4 has positive refractive power. The object side S7 of the fourth lens L4 is convex near the optical axis, and the image side S8 is concave near the optical axis.

[0104] 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.

[0105] The sixth lens L6 has positive refractive power. The object side S11 of the sixth lens L6 is convex near the optical axis, and the image side S12 is convex near the optical axis.

[0106] The seventh lens L7 has negative refractive power. The object side S13 of the seventh lens L7 is concave near the optical axis, and the image side S14 is concave near the optical axis.

[0107] The eighth lens L8 has positive refractive power. The object side S15 of the eighth lens L8 is convex near the optical axis, and the image side S16 is concave near the optical axis.

[0108] The other structures of the second embodiment are the same as those of the first embodiment, and can be referred to accordingly.

[0109] 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 546 nm. The units of Y radius, thickness and effective focal length are millimeters (mm). The meanings of the other parameters are the same as those of the parameters in the first embodiment. Table 2a

[0110] 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; Table 2b

[0111] Figure 4 (a) Figure 4 (b) Figure 4 Image (c) shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system 10 of 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 angles. Figure 4 As can be seen from the aberration diagram, the longitudinal spherical aberration, field curvature, and distortion of the optical system 10 are all well controlled, thus the optical system 10 of this embodiment has good imaging quality.

[0112] Third Embodiment Please refer to Figure 5 The optical system 10 of this embodiment includes, from the object side to the image side along the optical axis: The first lens L1 has negative refractive power. The object side S1 of the first lens L1 is convex near the optical axis, and the image side S2 is concave near the optical axis.

[0113] 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.

[0114] 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 convex near the optical axis.

[0115] The fourth lens L4 has positive refractive power. The object side S7 of the fourth lens L4 is convex near the optical axis, and the image side S8 is concave near the optical axis.

[0116] 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.

[0117] The sixth lens L6 has positive refractive power. The object side S11 of the sixth lens L6 is convex near the optical axis, and the image side S12 is convex near the optical axis.

[0118] The seventh lens L7 has negative refractive power. The object side S13 of the seventh lens L7 is concave near the optical axis, and the image side S14 is concave near the optical axis.

[0119] The eighth lens L8 has positive refractive power. The object side S15 of the eighth lens L8 is convex near the optical axis, and the image side S16 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 546 nm. The units of Y radius, thickness and effective focal length are millimeters (mm). The meanings of the other parameters are the same as those of the parameters in the first embodiment. Table 3a

[0122] 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; Table 3b

[0123] Figure 6 (a) Figure 6 (b) Figure 6 Image (c) shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system 10 of 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 angles. Figure 6 As can be seen from the aberration diagram, the longitudinal spherical aberration, field curvature, and distortion of the optical system 10 are all well controlled, thus the optical system 10 of this embodiment has good imaging quality.

[0124] Fourth embodiment Please refer to Figure 7 The optical system 10 of this embodiment includes, from the object side to the image side along the optical axis: The first lens L1 has negative refractive power. The object side S1 of the first lens L1 is convex near the optical axis, and the image side S2 is concave near the optical axis.

[0125] 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.

[0126] 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 convex near the optical axis.

[0127] The fourth lens L4 has positive refractive power. The object side S7 of the fourth lens L4 is convex near the optical axis, and the image side S8 is concave near the optical axis.

[0128] 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.

[0129] The sixth lens L6 has positive refractive power. The object side S11 of the sixth lens L6 is convex near the optical axis, and the image side S12 is convex near the optical axis.

[0130] The seventh lens L7 has negative refractive power. The object side S13 of the seventh lens L7 is concave near the optical axis, and the image side S14 is concave near the optical axis.

[0131] The eighth lens L8 has positive refractive power. The object side S15 of the eighth lens L8 is convex near the optical axis, and the image side S16 is concave near the optical axis.

[0132] The other structures of the fourth embodiment are the same as those of the first embodiment, and can be referred to accordingly.

[0133] 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 546 nm. The units of Y radius, thickness and effective focal length are millimeters (mm). The meanings of the other parameters are the same as those of the parameters in the first embodiment. Table 4a

[0134] 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; Table 4b

[0135] Figure 8 (a) Figure 8 (b) Figure 8 Image (c) shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system 10 of 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 angles. Figure 8As can be seen from the aberration diagram, the longitudinal spherical aberration, field curvature, and distortion of the optical system 10 are all well controlled, thus the optical system 10 of this embodiment has good imaging quality.

[0136] Fifth Embodiment Please refer to Figure 9 The optical system 10 of this embodiment includes, from the object side to the image side along the optical axis: The first lens L1 has negative refractive power. The object side S1 of the first lens L1 is convex near the optical axis, and the image side S2 is concave near the optical axis.

[0137] 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.

[0138] 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 convex near the optical axis.

[0139] The fourth lens L4 has positive refractive power. The object side S7 of the fourth lens L4 is convex near the optical axis, and the image side S8 is concave near the optical axis.

[0140] 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.

[0141] The sixth lens L6 has positive refractive power. The object side S11 of the sixth lens L6 is convex near the optical axis, and the image side S12 is convex near the optical axis.

[0142] The seventh lens L7 has negative refractive power. The object side S13 of the seventh lens L7 is concave near the optical axis, and the image side S14 is concave near the optical axis.

[0143] The eighth lens L8 has positive refractive power. The object side S15 of the eighth lens L8 is convex near the optical axis, and the image side S16 is concave near the optical axis.

[0144] The other structures of the fifth embodiment are the same as those of the first embodiment, and can be referred to accordingly.

[0145] 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 546 nm. The units of Y radius, thickness and effective focal length are millimeters (mm). The meanings of the other parameters are the same as those of the parameters in the first embodiment. Table 5a

[0146] 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; Table 5b

[0147] Figure 10 (a) Figure 10 (b) Figure 10 Image (c) shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system 10 of 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 angles. Figure 10 As can be seen from the aberration diagram, the longitudinal spherical aberration, field curvature, and distortion of the optical system 10 are all well controlled, thus the optical system 10 of this embodiment has good imaging quality.

[0148] Table 6 shows the FOV, FNO, TTL / F, TTL / IMGH, TTL / BFL, F3 / F, F23 / F, F2 / F6, F6 / F7, (R1+R2) / (R1-R2), R3 / (R4+CT2), R14 / R13, R1 / F1, R14 / F7, (R5+R6) / F3, SD8 / SD9, SD1 / IMGH, SAG2 / CT1, CT2 / CT3, CT5 / CT6, R16 / CT8, FOV / FNO, etc. in the optical system 10 of the first to fifth embodiments. The values ​​of ∑CT / ∑AT, F1 / F, F2 / F, F4 / F, F5 / F, F6 / F, F7 / F, F8 / F, R1 / R2, R3 / R4, R5 / R6, R7 / R8, R9 / R10, R11 / R12, and R15 / R16; Table 6

[0149] As can be seen from Table 6, the optical systems of the first to fifth embodiments all satisfy the following relational expressions: 120 ≤ FOV ≤ 150, 1.3 ≤ FNO ≤ 1.6, 6.2 ≤ TTL / F ≤ 7.6, 6.4 ≤ TTL / IMGH ≤ 7.8, 9 ≤ TTL / BFL ≤ 18.5, 1.9 ≤ F3 / F ≤ 2.6, -12 ≤ F23 / F ≤ -8, -1 ≤ F2 / F6 ≤ -0.7, -1.4 ≤ F6 / F7 ≤ -1.2, 1 ≤ (R1 + R2) / (R1 - R2) ≤ 1.5, -0.6 ≤ R3 / (R4 + CT2) ≤ -0.3, -15 ≤ R14 / R13 ≤ -2, -22 ≤ R1 / F1 ≤ -2, -15 ≤ R14 / F7 ≤ -3, 0.25 ≤ (R5 + R6) / F3 ≤ 1, 1 ≤ SD8 / SD9 ≤ 1.3, 1.35 ≤ SD1 / IMGH ≤ 1.75, 1.35 ≤ SAG2 / CT1 ≤ 2.65, 0.7 ≤ CT2 / CT3 ≤ 1.1, 0.85 ≤ CT5 / CT6 ≤ 1.45, 4 ≤ R16 / CT8 ≤ 16, 80deg ≤ FOV / FNO ≤ 105deg, 120deg ≤ ≤ 150deg, 1.7 ≤ ∑CT / ∑AT ≤ 2.3, -2.3 ≤ F1 / F ≤ -1.7, -1.6 ≤ F2 / F ≤ -1.2, 2.8 ≤ F4 / F ≤ 4, 2.9 ≤ F5 / F ≤ 3.4, 1.5 ≤ F6 / F ≤ 2, -1.6 ≤ F7 / F ≤ -1.1, 4 ≤ F8 / F ≤ 5.8, 5 ≤ R1 / R2 ≤ 40, -0.7 ≤ R3 / R4 ≤ -0.3, -2.1 ≤ R5 / R6 ≤ -1.2, 0 < R7 / R8 ≤ 0.3, -0.6 ≤ R9 / R10 ≤ -0.3, -3.5 ≤ R11 / R12 ≤ -1.5, 0.2 ≤ R15 / R16 ≤ 0.7.

[0150] Please refer to Figure 11The present invention also provides a camera module 20, which includes a photosensitive chip 21 and an optical system 10 as described in any of the above embodiments. The photosensitive chip 21 is disposed on the image side of the optical system 10. The photosensitive surface of the photosensitive chip 21 is located on the imaging surface of the optical system 10, and light rays from an object incident on the photosensitive surface through a lens can be converted into electrical signals for an image. The photosensitive chip 21 can be a complementary metal-oxide-semiconductor (CMOS) or a charge-coupled device (CCD). The camera module 20 can be an imaging module integrated into an electronic device 30 or a separate lens. By incorporating the optical system 10 provided by the present invention into the camera module 20, the camera module 20 can achieve miniaturization, a large aperture, high resolution, high illumination, and a wide field of view through reasonable design of the surface shape and refractive power of each lens in the optical system 10.

[0151] Please see Figure 12 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, monitoring equipment, 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 miniaturization, a large aperture, high resolution, high illumination, and a wide field of view.

[0152] 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 eight refractive lenses, arranged sequentially from the object side to the image side along the optical axis: The first lens has negative refractive power. The object side of the first lens is convex near the optical axis, and the image side of the first lens is concave near the optical axis. The second lens has negative refractive power. The object side of the second lens is concave near the optical axis, and the image side of the second lens is concave near the optical axis. The third lens has positive refractive power. The object side of the third lens is convex near the optical axis, and the image side of the third lens is convex near the optical axis. The fourth lens has positive refractive power. The object side of the fourth lens is convex near the optical axis, and the image side of the fourth lens is concave near the optical axis. The fifth lens 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 has positive refractive power, and the object-side surface of the sixth lens is convex near the optical axis; the image-side surface of the sixth lens is convex near the optical axis. The seventh lens has negative refractive power. The object-side surface of the seventh lens is concave near the optical axis, and the image-side surface of the seventh lens is concave near the optical axis. The eighth lens has positive refractive power. The object side of the eighth lens is convex near the optical axis, and the image side of the eighth lens is concave near the optical axis. The optical system satisfies the following relationships: 120deg≤FOV≤150deg, 1.3≤FNO≤1.6; Wherein, FOV is the maximum field of view of the optical system, and FNO is the aperture number of the optical system.

2. The optical system as described in claim 1, characterized in that, The optical system satisfies the following relationship: 6.2≤TTL / F≤7.6; and / or, 6.4 ≤ TTL / IMGH ≤ 7.8; and / or, 9≤TTL / BFL≤18.5; Wherein, TTL is the distance on the optical axis from the object side of the first lens to the imaging surface, F is the effective focal length of the optical system, IMGH is half the image height corresponding to the maximum field of view of the optical system, and BFL is the distance on the optical axis from the image side of the eighth lens to the imaging surface of the optical system.

3. The optical system as described in claim 1, characterized in that, The optical system satisfies the following relationship: 1.9 ≤ F3 / F ≤ 2.6; and / or, -12≤F23 / F≤-8; and / or, -1≤F2 / F6≤-0.7; and / or, -1.4≤F6 / F7≤-1.2; Wherein, F3 is the effective focal length of the third lens, F is the effective focal length of the optical system, F23 is the combined effective focal length of the second lens and the third lens, F2 is the effective focal length of the second lens, F6 is the effective focal length of the sixth lens, and F7 is the effective focal length of the seventh lens.

4. The optical system as claimed in claim 1, characterized in that, The optical system satisfies the following relationship: 1≤(R1+R2) / (R1-R2)≤1.5; and / or, -0.6≤R3 / (R4+CT2)≤-0.3; and / or, -15≤R14 / R13≤-2; Wherein, R1 is the radius of curvature of the object side of the first lens at the optical axis, R2 is the radius of curvature of the image side of the first lens at the optical axis, R3 is the radius of curvature of the object side of the second lens at the optical axis, R4 is the radius of curvature of the image side of the second lens at the optical axis, CT2 is the thickness of the second lens on the optical axis, R13 is the radius of curvature of the object side of the seventh lens at the optical axis, and R14 is the radius of curvature of the image side of the seventh lens at the optical axis.

5. The optical system as claimed in claim 1, characterized in that, The optical system satisfies the following relationship: -22≤R1 / F1≤-2; and / or, -15≤R14 / F7≤-3; and / or, 0.25≤(R5+R6) / F3≤1; Wherein, R1 is the radius of curvature of the object side of the first lens at the optical axis, F1 is the effective focal length of the first lens, R14 is the radius of curvature of the image side of the seventh lens at the optical axis, F7 is the effective focal length of the seventh lens, R5 is the radius of curvature of the object side of the third lens at the optical axis, R6 is the radius of curvature of the image side of the third lens at the optical axis, and F3 is the effective focal length of the third lens.

6. The optical system as claimed in claim 1, characterized in that, The optical system satisfies the following relationship: 1 ≤ SD8 / SD9 ≤ 1.3; and / or, 1.35≤SD1 / IMGH≤1.75; and / or, 1.35≤SAG2 / CT1≤2.65; Wherein, SD1 is half of the maximum effective aperture of the object side of the first lens, SD8 is half of the maximum effective aperture of the image side of the fourth lens, SD9 is half of the maximum effective aperture of the object side of the fifth lens, IMGH is half of the image height corresponding to the maximum field of view of the optical system, SAG2 is the sag at 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.

7. The optical system as claimed in claim 1, characterized in that, The optical system satisfies the following relationship: 0.7 ≤ CT2 / CT3 ≤ 1.1; and / or, 0.85≤CT5 / CT6≤1.45; and / or, 4≤R16 / CT8≤16; Wherein, CT2 is the thickness of the second lens on the optical axis, CT3 is the thickness of the third 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, R16 is the radius of curvature of the image side of the eighth lens on the optical axis, and CT8 is the thickness of the eighth lens on the optical axis.

8. The optical system as claimed in claim 1, characterized in that, The optical system satisfies the following relationship: 80deg≤FOV / FNO≤105deg; and / or, 120deg≤ ≤150deg; And / or, 1.7≤∑CT / ∑AT≤2.3; Wherein, F is the effective focal length of the optical system, IMGH is half the image height corresponding to the maximum field of view of the optical system, ∑CT is the sum of the thicknesses of the first lens to the eighth lens on the optical axis, and ∑AT is the sum of the air gaps between two adjacent lenses on the optical axis among the first lens to the eighth lens.

9. A camera module, characterized in that, It includes a photosensitive chip and an optical system according to any one of claims 1 to 8, wherein the photosensitive chip is located on the image side of the optical system.

10. An electronic device, characterized in that, The electronic device includes a housing and the camera module as described in claim 9, wherein the camera module is disposed within the housing.

Images