Optical lens, camera module and terminal device

Abstract

An optical lens, a camera module and a terminal device, relate to the optical imaging technical field, and have eight lenses with refractive power, which sequentially include, along an optical axis from an object side to an image side: a first lens with negative refractive power, an object side surface of which is a convex surface at a near optical axis, and an image side surface of which is a concave surface at the near optical axis; a second lens with negative refractive power, an object side surface of which is a convex surface at the near optical axis, and an image side surface of which is a concave surface at the near optical axis; a third lens with negative refractive power, both an object side surface and an image side surface of which are concave surfaces at the near optical axis; a fourth lens with positive refractive power, an object side surface of which is a convex surface at the near optical axis, and an image side surface of which is a concave surface at the near optical axis; a fifth lens with positive refractive power; a sixth lens with positive refractive power, both an object side surface and an image side surface of which are convex surfaces at the near optical axis; a seventh lens with negative refractive power; and an eighth lens with positive refractive power. The optical lens satisfies the following relationship: 190°≤FOV≤200°; 1.85≤FNO≤2.1. The present application has the characteristics of a large field of view, and improves the imaging quality of the optical lens.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical imaging, in particular to an optical lens, a camera module and a terminal device. BACKGROUND

[0002] A wide-angle lens is a lens that can capture a wider field of view. It is widely used in monitoring or vehicle-mounted camera devices. With the rapid development of the automobile industry and the increasing attention to driving safety and driving experience, the vehicle-mounted vision system plays an increasingly key role in modern vehicles. During driving, the driver needs to have a comprehensive and accurate perception of the vehicle's surroundings to make timely and appropriate driving decisions. The viewing angle of the traditional vehicle-mounted lens is relatively limited, which is difficult to meet the demand for wide-view monitoring in complex traffic scenarios, and the imaging quality is low. SUMMARY

[0003] In view of the above, it is necessary to propose an optical lens, a camera module and a terminal device to have a larger field of view while having higher imaging quality.

[0004] To achieve the above purpose, in a first aspect, the present application discloses an optical lens, which has eight lenses with refractive power, and comprises, in order from the object side to the image side along the optical axis: a first lens with negative refractive power, the object side surface is convex near the optical axis, and the image side surface is concave near the optical axis; a second lens with negative refractive power, the object side surface is convex near the optical axis, and the image side surface is concave near the optical axis; a third lens with negative refractive power, the object side surface is concave near the optical axis, and the image side surface is concave near the optical axis; a fourth lens with positive refractive power, the object side surface is convex near the optical axis, and the image side surface is concave near the optical axis; a fifth lens with positive refractive power, the object side surface is convex near the optical axis, and the image side surface is convex near the optical axis; a sixth lens with positive refractive power, the object side surface is convex near the optical axis, and the image side surface is convex near the optical axis; a seventh lens with negative refractive power, the object side surface is concave near the optical axis, and the image side surface is concave near the optical axis; and an eighth lens with positive refractive power, the object side surface is convex near the optical axis, and the image side surface is convex near the optical axis; the optical lens satisfies the following relationship: 190°≤FOV≤200°; 1.85≤FNO≤2.1; wherein FOV is the maximum field of view of the optical lens, and FNO is the aperture number of the optical lens.

[0005] The optical lens provided in the application has the following advantages. The first lens has a negative refractive power, and the object side is convex near the optical axis and the image side is concave near the optical axis, which is conducive to capturing the large-angle light rays entering the first lens, thereby achieving the effect of large-angle imaging and being conducive to the optical lens covering a large visual angle range. The object side of the second lens is convex near the optical axis, the image side is concave near the optical axis, and the second lens has a negative refractive power, which is conducive to sharing the negative refractive power pressure of the first lens, so that the large-angle light rays of the first lens enter the second lens smoothly at a reasonable angle, and the aberration of the first lens caused by the large-angle light rays can be corrected. The object side of the third lens is concave near the optical axis, the image side is concave near the optical axis, and the third lens has a negative refractive power, which can further share the negative refractive power pressure of the first lens and the second lens, so that the large-angle light rays of the first lens enter the third lens smoothly at a reasonable angle. The object side of the fourth lens is convex near the optical axis, the image side is concave near the optical axis, and the fourth lens has a positive refractive power, which can offset the aberration caused by the object side lens (i.e., the first lens to the third lens) with a negative refractive power, and the positive and negative refractive power of the third lens and the fourth lens can offset the aberration caused by each other, that is, the fourth lens with a positive refractive power is conducive to correcting the aberration of the third lens, thereby reducing the field curvature of the optical lens. The fifth lens has a positive refractive power, and the object side near the optical axis is convex, and the image side near the optical axis is convex, which is conducive to enhancing the positive refractive power of the fifth lens, facilitating the convergence of large-angle incident light, and being conducive to shortening the total length of the optical lens. The sixth lens with a positive refractive power and the seventh lens with a negative refractive power are conducive to correcting the coma of the optical lens, and in addition, the object side of the sixth lens near the optical axis is convex, the image side near the optical axis is convex, the object side of the seventh lens near the optical axis is concave, and the image side near the optical axis is concave, which is conducive to correcting the spherical aberration, astigmatism, field curvature and distortion of the optical lens, and the positive and negative refractive power of the lens can offset the aberration caused by each other, that is, the seventh lens with a negative refractive power is conducive to correcting the aberration of the sixth lens, thereby reducing the field curvature of the optical lens. The eighth lens with a positive refractive power has a convex object side and a convex image side, which can increase the relative luminance and improve the brightness of the imaging surface.

[0006] When 190°≤FOV≤200°, the optical lens has a large field of view, which is conducive to the optical lens being able to obtain more scene content, thereby enriching the imaging information of the optical lens. When 1.85≤FNO≤2.1, the optical lens has a large aperture, and the optical lens has sufficient light quantity, which can make the image captured by the optical lens clearer, thereby being applicable to shooting scenes with low brightness such as high-quality night scenes and starry skies. In addition, the introduction of excessive aberration can be avoided, and the overall balance of the optical lens can be achieved.

[0007] In a second aspect, the present application discloses a camera module, comprising a photosensitive chip and the optical lens as described in the first aspect above, wherein the photosensitive chip is arranged on the image side of the optical lens. The camera module with the optical lens can make the optical lens have the characteristic of large field of view, and improve the imaging quality of the optical lens.

[0008] In a third aspect, the present application discloses a terminal device, comprising a shell and the camera module as described in the second aspect above, wherein the camera module is arranged on the shell. The electronic device with the camera module can make the optical lens have the characteristic of large field of view, and improve the imaging quality of the optical lens. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 is a structural schematic diagram of the optical lens disclosed by the first embodiment of the present application.

[0010] Figure 2 is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical lens disclosed by the first embodiment of the present application.

[0011] Figure 3 is a structural schematic diagram of the optical lens disclosed by the second embodiment of the present application.

[0012] Figure 4 is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical lens disclosed by the second embodiment of the present application.

[0013] Figure 5 is a structural schematic diagram of the optical lens disclosed by the third embodiment of the present application.

[0014] Figure 6 is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical lens disclosed by the third embodiment of the present application.

[0015] Figure 7 is a structural schematic diagram of the optical lens disclosed by the fourth embodiment of the present application.

[0016] Figure 8 is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical lens disclosed by the fourth embodiment of the present application.

[0017] Figure 9 is a structural schematic diagram of the optical lens disclosed by the fifth embodiment of the present application.

[0018] Figure 10 is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical lens disclosed by the fifth embodiment of the present application.

[0019] Figure 11 is a structural schematic diagram of the camera module disclosed by the present application.

[0020] Figure 12 is a structural schematic diagram of a terminal device disclosed in the present application.

[0021] Main element symbol explanation: optical lens 100, optical axis O, first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, eighth lens L8, object side S1, S3, S5, S7, S9, S11, S13, S15, image side S2, S4, S6, S8, S10, S12, S14, S16, diaphragm STO, filter IR, protective glass CG, imaging surface IMG, camera module 200, photosensitive chip 201, terminal device 300, shell 301. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0023] In a first aspect, referring to Figure 1 The embodiments of the present application disclose an optical lens 100, which has a total of eight lenses with refractive power. From the object side to the image side along the direction of the optical axis O, they are in turn a first lens L1 with negative refractive power, a second lens L2 with negative refractive power, a third lens L3 with negative refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with positive refractive power, a sixth lens L6 with positive refractive power, a seventh lens L7 with negative refractive power, and an eighth lens L8 with positive refractive power.

[0024] Further, the object side surface S1 of the first lens L1 is convex at the vicinity of the optical axis O, and the image side surface S2 of the first lens L1 is concave at the vicinity of the optical axis O. The object side surface S3 of the second lens L2 is convex at the vicinity of the optical axis O, and the image side surface S3 of the second lens L2 is concave at the vicinity of the optical axis O. The object side surface S5 of the third lens L3 is concave at the vicinity of the optical axis O, and the image side surface S6 of the third lens L3 is concave at the vicinity of the optical axis O. The object side surface S7 of the fourth lens L4 is convex at the vicinity of the optical axis O, and the image side surface S8 of the fourth lens L4 is concave at the vicinity of the optical axis O. The object side surface S9 of the fifth lens L5 is convex at the vicinity of the optical axis O, and the image side surface S10 of the fifth lens L5 is convex at the vicinity of the optical axis O. The object side surface S11 of the sixth lens L6 is convex at the vicinity of the optical axis O, and the image side surface S13 of the sixth lens L6 is convex at the vicinity of the optical axis O. The object side surface S13 of the seventh lens L7 is concave at the vicinity of the optical axis O, and the image side surface S14 of the seventh lens L7 is concave at the vicinity of the optical axis O. The object side surface S15 of the eighth lens L8 is convex at the vicinity of the optical axis O, and the image side surface S16 of the eighth lens L8 is concave at the vicinity of the optical axis O.

[0025] In the optical lens 100 provided by the embodiment of the present application, the first lens L1 has negative refractive power, and the object side S1 is convex at the near optical axis O, and the image side S2 is concave at the near optical axis O, which is beneficial to capture the large-angle light rays entering the first lens L1, thereby achieving the effect of large wide-angle imaging, and is beneficial to the optical lens 100 covering a large angle of view. The object side S3 of the second lens L2 is convex at the near optical axis O, the image side S4 is concave at the near optical axis O, and has negative refractive power, which is beneficial to share the negative refractive power pressure of the first lens L1, so that the large-angle light rays of the first lens L1 enter the second lens L2 smoothly at a reasonable angle, and at the same time, the aberration of the first lens L1 caused by the large field angle light rays can be corrected. The object side S5 of the third lens L3 is concave at the near optical axis O, the image side S6 is concave at the near optical axis O, and has negative refractive power, which can further share the negative refractive power pressure of the first lens L1 and the second lens L2, so that the large-angle light rays of the first lens L1 enter the third lens L3 smoothly at a reasonable angle. The object side S7 of the fourth lens L4 is convex at the near optical axis O, the image side S8 is concave at the near optical axis O, and has positive refractive power, which can offset the aberration caused by the negative refractive power object side lens (i.e. the first lens L1 to the third lens L3), at the same time, the positive and negative refractive power lens matching of the third lens L3 and the fourth lens L4 can offset the aberration caused by each other, that is, the fourth lens L4 with positive refractive power is beneficial to correct the aberration caused by the third lens L3, thereby reducing the field curvature of the optical lens 100. The fifth lens L5 has positive refractive power, and the convex surface design of the object side 9 at the near optical axis O and the convex surface design of the image side S10 at the near optical axis O are beneficial to enhance the positive refractive power of the fifth lens L5, which is convenient for the convergence of large-angle incident light, thereby being beneficial to shorten the total length of the optical lens 100. The sixth lens L6 with positive refractive power and the seventh lens L7 with negative refractive power are beneficial to correct the coma of the optical lens 100, in addition, the object side S11 of the sixth lens L6 is convex at the near optical axis O, the image side S12 is convex at the near optical axis O, the object side S13 and the image side S14 of the seventh lens L7 are concave at the near optical axis O, which is beneficial to correct the spherical aberration, astigmatism, field curvature and distortion of the optical lens 100, and the positive and negative refractive power lens matching can offset the aberration caused by each other, that is, the seventh lens L7 with negative refractive power is beneficial to correct the aberration caused by the sixth lens L6, thereby reducing the field curvature of the optical lens 100. The eighth lens L8 with positive refractive power has convex object side S15 and image side S16, which can increase the relative luminance and improve the brightness of the imaging surface.

[0026] In some embodiments, when the optical lens 100 is applied to an electronic device such as a vehicle-mounted device, a driving recorder, or a car, the materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 can all be glass, so that the optical lens 100 has good optical effects while reducing the influence of temperature on the lenses. Of course, some of the lenses of the optical lens 100 can be made of glass, and some of the lenses can be made of plastic, so that the influence of temperature on the lenses is reduced to achieve better imaging effects, while the processing cost of the lenses and the weight of the lenses are reduced, thereby reducing the processing cost of the optical lens 100 and reducing the overall weight of the optical lens 100. In addition, it can be understood that when the optical lens 100 is applied to an electronic device such as a smart phone or a smart tablet, the materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 can be plastic to reduce the overall weight of the optical lens 100.

[0027] In some embodiments, considering that the spherical lens has the characteristics of simple manufacturing process and low production cost, and can facilitate flexible design of the lens surface to improve the imaging resolution of the optical lens 100. The aspherical lens can make the object side or image side of the lens have more flexible design, so that the lens can well solve the problems of unclear imaging, distorted view, or narrow field of view in the case of small size and thin thickness, and the optical lens 100 can have good imaging quality without setting too many lenses, which is conducive to shortening the length of the optical lens 100. Based on this, the first lens L1, the second lens L2, the fifth lens L5, and the sixth lens L6 can be spherical lenses, and the seventh lens L7 and the eighth lens L8 can be aspherical lenses. In this way, through the combination design of spherical and aspherical lenses, the processability of each lens can be improved, which is conducive to surface design, and the object side or image side of the lens can have more flexible design, so that each lens can well solve the problems of unclear imaging, distorted view, or narrow field of view in the case of small size and thin thickness, and the optical lens 100 can have good imaging quality without setting too many lenses, which is conducive to shortening the length of the optical lens 100. It can be understood that in other embodiments, the surfaces of the lenses in the optical lens 100 can all be spherical, all be aspherical, or any combination of spherical and aspherical, which can be selected according to actual needs, so the specific embodiments are not limited herein.

[0028] In some embodiments, the optical lens 100 further comprises a stop STO, which can be an aperture stop and / or a field stop. For example, the stop STO can be an aperture stop, or the stop STO can be a field stop, or the stop STO can be an aperture stop and a field stop. By arranging the stop STO between the image side S8 of the fourth lens L4 and the object side S9 of the fifth lens L5, the exit pupil can be away from the imaging surface IMG, and the effective diameter of the optical lens 100 can be reduced without reducing the telecentricity of the optical lens 100, thereby achieving miniaturization. It can be understood that in other embodiments, the stop STO can also be arranged between other lenses, and the arrangement can be adjusted according to actual conditions, which is not specifically limited in the present embodiment.

[0029] In some embodiments, the optical lens 100 further comprises an infrared filter IR arranged between the eighth lens L8 and the imaging surface IMG of the optical lens 100. Optionally, the infrared filter IR can be a dual-pass filter, that is, it can simultaneously transmit visible light and part of infrared light, thereby realizing different waveband selection, that is, it can realize visible light imaging and infrared imaging, thereby realizing day and night use. It can be understood that the infrared filter IR can be made of plastic, or can be made of optical glass coating, or other materials, which can be selected according to actual needs, and is not specifically limited in the present embodiment.

[0030] In some embodiments, the optical lens 100 further comprises a protective glass CG arranged between the infrared filter IR and the imaging surface IMG of the optical lens 100, thereby being capable of protecting and dustproofing the photosensitive chip. The protective glass CG can be made of plastic, or can be made of optical glass coating, or other materials, which can be selected according to actual needs, and is not specifically limited in the present embodiment. It can be understood that the protective glass CG can be part of the optical lens 100, or can be removed from the optical lens 100, but when the protective glass CG is removed, the total optical length of the optical lens 100 remains unchanged.

[0031] In some embodiments, the optical lens 100 satisfies the relationship: 190°≤FOV≤200°; wherein FOV is the maximum field of view angle of the optical lens 100. Specifically, FOV can be 191°, 193°, 195°, 197°, 198° or 199°, etc. When the above relationship is satisfied, the optical lens 100 has a larger field of view angle, which is beneficial to the optical lens 100 to obtain more scene content, thereby enriching the imaging information of the optical lens 100.

[0032] In some embodiments, the optical lens 100 satisfies a relationship: 1.85≤FNO≤2.1; wherein the FNO is an aperture number of the optical lens 100. Specifically, the FNO can be 1.85, 1.91, 1.93, 1.97, 1.99, or 2.1, etc. When the optical lens 100 satisfies the above relationship, the optical lens 100 has the characteristics of a large aperture, and the optical lens 100 has sufficient light quantity, which can make the image captured by the optical lens 100 clearer, so that the optical lens 100 can be suitable for shooting scenes with small light intensity such as high-quality night scenes and starry sky scenes. In addition, it can also avoid introducing excessive aberration, so that the optical lens 100 achieves overall balance.

[0033] In some embodiments, the optical lens 100 satisfies a relationship: 9.5≤TTL / IMGH≤12; wherein the TTL is a distance from the object side S1 of the first lens L1 to the imaging surface IMG of the optical lens 100 on the optical axis O, and the IMGH is a radius of the largest effective imaging circle on the imaging surface IMG of the optical lens 100. Specifically, the TTL / IMGH can be 9.5, 10, 10.5, 11, 11.5, or 12, etc. When the optical lens 100 satisfies the above relationship, in combination with the reasonable configuration of the refractive power of each lens, the optical lens 100 can obtain good thinness, good aberration balance and image quality improvement capability, and can support high-pixel photosensitive chips. In addition, the IMGH can determine the size of the photosensitive chip, and the larger the IMGH is, the larger the maximum size of the photosensitive chip that can be supported is.

[0034] In some embodiments, the optical lens 100 satisfies a relationship: 16≤TTL / F≤20; wherein the TTL is a distance from the object side S1 of the first lens L1 to the imaging surface IMG of the optical lens 100 on the optical axis O, the IMGH is a radius of the largest effective imaging circle on the imaging surface IMG of the optical lens 100, and the F is an effective focal length of the optical lens 100. Specifically, the TTL / F can be 16, 17, 18, 18.5, 19, or 20, etc. By reasonably configuring the total optical length of the optical lens 100 and the focal length of the optical lens 100, the optical lens 100 can satisfy the field of view angle range while reasonably controlling the total optical length of the optical lens 100, and can also satisfy the characteristics of miniaturization of the optical lens 100.

[0035] In some embodiments, the optical lens 100 satisfies a relationship: 1.6≤IMGH / F≤1.75; wherein, IMGH is a radius of a maximum effective imaging circle on an imaging surface IMG of the optical lens 100, and F is an effective focal length of the optical lens 100. Specifically, IMGH / F can be 1.6, 1.63, 1.65, 1.7, 1.71, 1.73, or 1.75, etc. When the optical lens 100 satisfies the above relationship, the distortion generated by the optical lens 100 can be effectively corrected, thereby reducing the manufacturing difficulty of the optical lens 100 while improving the imaging quality of the optical lens 100; in addition, it can be helpful to control the focal length of the optical lens 100 within a reasonable range, and ensure that the optical lens 100 has sufficient light collection area and sufficient field of view angle, thereby simultaneously satisfying the characteristics of large field of view angle and large image surface.

[0036] In some embodiments, the optical lens 100 satisfies a relationship: -8≤F1 / F≤-6; wherein, F1 is an effective focal length of the first lens L1, and F is an effective focal length of the optical lens 100. Specifically, F1 / F can be -8, -7.5, -7, -6.7, -6.3, or -6, etc. When the optical lens 100 satisfies the above relationship, the ratio of the focal length of the first lens L1 to the focal length of the optical lens 100 can be reasonably configured, and for the entire optical lens 100, the refractive power of the first lens L1 will not be too strong, avoiding the introduction of too much spherical aberration, so that the optical lens 100 has good imaging quality.

[0037] In some embodiments, the optical lens 100 satisfies a relationship: 4≤F4 / F≤7; wherein, F4 is an effective focal length of the fourth lens L4, and F is an effective focal length of the optical lens 100. Specifically, F4 / F can be 4, 4.5, 5, 5.5, 6, or 7, etc. When the optical lens 100 satisfies the above relationship, the fourth lens L4 provides part of the positive refractive power for the optical lens 100, which can be used to adjust the overall refractive power of the optical lens 100, and the fourth lens L4, the first lens L1, the second lens L2, and the third lens L3 form a quasi-Gaussian structure, which can balance the distortion generated by the first lens L1, the second lens L2, and the third lens L3, avoid excessive refractive index to cause high-order aberration, thereby improving the imaging quality of the optical lens 100.

[0038] In some embodiments, the optical lens 100 satisfies a relationship: -20≤F67 / F≤-4; where F is an effective focal length of the optical lens 100, F4 is an effective focal length of the fourth lens L4, and F67 is a combined effective focal length of the sixth lens L6 and the seventh lens L7. Specifically, F67 / F can be -20, -16, -12, -8, -6, or -4, etc. Satisfying the above relationship, the ratio of the combined effective focal length of the sixth lens L6 and the seventh lens L7 to the effective focal length of the optical lens 100 is reasonably configured, which is conducive to correcting the off-axis aberration of the optical lens 100 and improving the imaging quality of the optical lens 100.

[0039] In some embodiments, the optical lens 100 satisfies a relationship: -0.4≤F1234 / F678≤-0.15; where F1234 is a combined effective focal length of the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4, and F678 is a combined effective focal length of the sixth lens L6, the seventh lens L7, and the eighth lens L8. Specifically, F1234 / F678 can be -0.4, -0.35, -0.3, -0.25, -0.2, or -0.15, etc. When the optical lens 100 satisfies the above relationship, the ratio of the combined effective focal length of the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 to the combined effective focal length of the sixth lens L6, the seventh lens L7, and the eighth lens L8 can be reasonably set, so as to be conducive to the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 collecting light rays in a larger angle range, and conducive to the sixth lens L6, the seventh lens L7, and the eighth lens L8 effectively converging edge light rays of the central and near field of view, thereby making the structure of the optical lens 100 more compact, being conducive to shortening the total length of the optical lens 100, and meeting the needs of miniaturized design of electronic devices. In addition, the sixth lens L6, the seventh lens L7, and the eighth lens L8 as a whole can also effectively correct the aberration of the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4, thereby being conducive to improving the imaging quality of the optical lens 100.

[0040] In some embodiments, the optical lens 100 satisfies the relationship: -5≤R5 / R6≤-1, where R5 is the radius of curvature of the object side S5 of the third lens L3 at the optical axis O, and R6 is the radius of curvature of the image side S6 of the third lens L3 at the optical axis O. Specifically, R5 / R6 can be -5, -4, -3, -2.5, -2, -1.5, or -1, etc. When the optical lens 100 satisfies the above relationship, the radii of curvature and the surface shape of the object side S5 and the image side S6 of the third lens L3 can be optimized, which is conducive to the reasonable cooperation of the third lens L3 with the negative refractive power of the first lens L1 and the negative refractive power of the second lens L2, thereby reducing the on-axis spherical aberration of the entire optical lens 100, and at the same time, being conducive to the correction of the light path of the third lens L3 to the fourth lens L4, thereby being conducive to reducing the generation of optical distortion.

[0041] In some embodiments, the optical lens 100 satisfies the relationship: 0.1≤R7 / R8≤0.55, where R7 is the radius of curvature of the object side S7 of the fourth lens L4 at the optical axis O, and R8 is the radius of curvature of the image side S8 of the fourth lens L4 at the optical axis O. Specifically, R7 / R8 can be 0.1, 0.2, 0.3, 0.4, 0.5, or 0.55, etc. When the optical lens 100 satisfies the above relationship, the aberration generated by the optical lens 100 can be corrected, so that the refractive power configuration of each lens of the optical lens 100 in the direction perpendicular to the optical axis O is uniform, the distortion and aberration generated by the front lens are greatly corrected, and at the same time, the fourth lens L4 is avoided from being excessively curved, which is easy to be molded and manufactured.

[0042] In some embodiments, the optical lens 100 satisfies the relationship: -0.9≤R9 / R10≤-0.2, where R9 is the radius of curvature of the object side S9 of the fifth lens L5 at the optical axis O, and R10 is the radius of curvature of the image side S10 of the fifth lens L5 at the optical axis O. Specifically, R9 / R10 can be -0.9, -0.7, -0.5, -0.4, -0.3, or -0.2, etc. When the optical lens 100 satisfies the above condition, the surface shape of the fifth lens L5 can be reasonably controlled, the astigmatism contribution of the fifth lens L5 can be effectively controlled, the imaging quality of the intermediate field can be ensured, the aberration of the optical lens 100 can be corrected, the distortion of the optical lens 100 can be balanced, at the same time, the surface shape of the object side S9 and the image side S10 of the fifth lens L5 at the optical axis O is avoided from being excessively curved, which is conducive to reducing the processing difficulty of the fifth lens L5 and improving the yield of the fifth lens L5.

[0043] In some embodiments, the optical lens 100 satisfies a relationship: -2≤R11 / R12≤-0.7, where R11 is a curvature radius of the object side S11 of the sixth lens L6 at the optical axis O, and R12 is a curvature radius of the image side S12 of the sixth lens L6 at the optical axis O. Specifically, R11 / R12 can be -2, -1.8, -1.3, -1, -0.85, or -0.7, etc. When the optical lens 100 satisfies the above relationship, the curvature radius of the object side S11 of the sixth lens L6 at the optical axis O and the curvature radius of the image side S12 of the sixth lens L6 at the optical axis O can be properly configured, so that the shape of the sixth lens L6 is not too curved, thereby correcting the astigmatism aberration of the optical lens 100 while reducing the performance variation sensitivity of the optical lens 100, which is conducive to improving product yield.

[0044] In some embodiments, the optical lens 100 satisfies a relationship: -10≤F2 / CT2≤-4, where F2 is an effective focal length of the second lens L2, and CT2 is a thickness of the second lens L2 at the optical axis O. Specifically, F2 / CT2 can be -10, -9, -8, -7, -5, or -4, etc. When the optical lens 100 satisfies the relationship, the effective focal length and the thickness of the second lens L2 can be properly configured, thereby effectively controlling the incident angle of light in the optical lens 100, reducing the sensitivity of the optical lens 100, which is conducive to correcting the aberration generated by the optical lens 100, and thereby conducive to improving the imaging quality of the optical lens 100.

[0045] In some embodiments, the optical lens 100 satisfies a relationship: -3≤F3 / CT3≤-1, where F3 is an effective focal length of the third lens L3, and CT3 is a thickness of the third lens L3 at the optical axis O. Specifically, F3 / CT3 can be -3, -2.5, -2, -1.6, -1.3, or -1, etc. When the optical lens 100 satisfies the relationship, the effective focal length and the thickness of the third lens L3 can be properly configured, thereby making the light entering the optical lens 100 more gentle, reducing the sensitivity of the optical lens 100, which is conducive to correcting the aberration generated by the optical lens 100, and thereby conducive to improving the imaging quality of the optical lens 100.

[0046] In some embodiments, the optical lens 100 satisfies a relationship: 1≤F8 / CT8≤2.5; wherein F8 is an effective focal length of the eighth lens L8, and CT8 is a thickness of the eighth lens L8 on the optical axis O. Specifically, F8 / CT8 can be 1, 1.3, 1.9, 2.1, 2.3, or 2.5, etc. When the optical lens 100 satisfies the relationship, by reasonably configuring the ratio of the effective focal length and the thickness of the eighth lens L8, the tolerance sensitivity of the thickness of the eighth lens L8 on the optical axis O in the optical lens 100 can be reduced, thereby reducing the processing difficulty of the eighth lens L8, improving the assembly yield of the optical lens 100, and reducing the production cost.

[0047] In some embodiments, the optical lens 100 satisfies a relationship: 5≤SD1 / F≤6.2; wherein SD1 is half of the maximum effective aperture of the object side S1 of the first lens L1, and F is an effective focal length of the optical lens 100. Specifically, SD1 / F can be 5, 5.3, 5.6, 5.8, 6, or 6.2, etc. When the optical lens 100 satisfies the above condition, the maximum effective aperture of the object side S1 of the first lens L1 and the total effective focal length of the optical lens 100 can be reasonably configured, so that the maximum effective aperture of the first lens L1 is small, thereby facilitating the production of an optical lens 100 with a small head.

[0048] In some embodiments, the optical lens 100 satisfies a relationship: 0.6≤SD9 / SD16≤0.75; wherein SD9 is half of the maximum effective aperture of the object side S9 of the fifth lens L5, and SD16 is half of the maximum effective aperture of the image side S16 of the eighth lens L8. Specifically, SD9 / SD16 can be 0.6, 0.63, 0.66, 0.69, 0.72, or 0.75, etc. When the optical lens 100 satisfies the above condition, it is beneficial to effectively reduce the size of the optical lens 100 while obtaining a large field of view, thereby facilitating the realization of wide-angle characteristics and miniaturization design.

[0049] In some embodiments, the optical lens 100 satisfies a relationship: 0.8≤SD4 / CT23≤1; wherein SD4 is half of the maximum effective aperture of the image side S of the second lens L, and CT23 is the distance between the image side S4 of the second lens L2 and the object side S5 of the third lens L3 on the optical axis O. Specifically, SD4 / CT23 can be 0.8, 0.84, 0.88, 0.92, 0.94, or 1, etc. When the optical lens 100 satisfies the above relationship, the length between the second lens L2 and the third lens L3 can be effectively compressed, and the width of the image side S4 of the second lens L2 perpendicular to the direction of the optical axis O can be reduced, thereby minimizing the volume of the optical lens 100; at the same time, it is beneficial to improve the assembly success rate of the optical lens 100.

[0050] In some embodiments, the optical lens 100 satisfies a relationship: 4.5≤SD7 / SAG7≤6.8; wherein SD7 is half of the maximum effective aperture of the object side S7 of the fourth lens L4, and SAG7 is the distance from the maximum effective half-aperture of the object side S7 of the fourth lens L4 to the intersection of the object side S1 of the first lens L1 and the optical axis O in the direction of the optical axis O. Specifically, SD7 / SAG7 can be 4.5, 5.0, 5.5, 6, 6.4, or 6.8, etc. When the optical lens 100 satisfies the above relationship, by controlling the ratio of the maximum effective half-aperture of the object side S7 of the fourth lens L4 to the sag of the object side S7, the size of the maximum effective half-aperture of the object side S7 of the fourth lens L4 can be effectively controlled, and by controlling the sag of the object side S7 of the fourth lens L4, the overall volume of the fourth lens L4 can be compressed to a greater extent, and the risk of ghosting can be reduced. When the optical lens 100 exceeds the upper limit of the above relationship, it is not conducive to reducing the maximum effective half-aperture of the object side S7 of the fourth lens L4, which affects the smooth incidence of light rays on the fifth lens L5 and increases the risk of ghosting; when the optical lens 100 is lower than the lower limit of the above relationship, the sag of the object side S7 of the fourth lens L4 is too large, and the surface profile of the fourth lens L4 is too curved, which is not conducive to the processing and design of the fourth lens L4.

[0051] In some embodiments, the optical lens 100 satisfies a relationship: 0.65≤CT3 / ET3≤0.9; wherein CT3 is the thickness of the third lens L3 on the optical axis O, and ET3 is the thickness of the third lens L3 at the maximum effective half-aperture in the direction of the optical axis O. Specifically, CT3 / ET3 can be 0.65, 0.7, 0.75, 0.8, 0.85, or 0.9, etc. When the optical lens 100 satisfies the above relationship, it is conducive to the processing and molding of the lens, reduces the difficulty of assembly, and effectively corrects the field curvature of the system. When it is lower than the lower limit of the above relationship, the center thickness of the third lens L3 on the optical axis O is too small, which is not conducive to the processing and molding of the lens; when it is higher than the upper limit of the above relationship, the center thickness of the third lens L3 on the optical axis O is too large, which will result in an excessive length of the optical lens 100 at the near optical axis O, which is not conducive to small size design.

[0052] In some embodiments, the optical lens 100 satisfies a relationship: 1≤CT4 / ET4≤1.1; wherein CT4 is the thickness of the fourth lens L4 on the optical axis O, and ET4 is the thickness of the fourth lens L4 at the maximum effective half aperture in the direction of the optical axis O. Specifically, CT4 / ET4 can be 1, 1.02, 1.04, 1.06, 1.08, or 1.1, etc. When the optical lens 100 satisfies the above relationship, by reasonably controlling the thickness ratio of the fourth lens L4, the surface shape of the fourth lens L4 is optimized, which is beneficial to the effective convergence of the large-angle incident light, and makes the light passing through the fourth lens L4 have a smaller deflection angle, thereby reducing the generation of stray light, and further ensuring good imaging performance.

[0053] In some embodiments, the optical lens 100 satisfies a relationship: 0.3≤CT7 / ET7≤0.75; wherein CT7 is the thickness of the seventh lens L7 on the optical axis O, and ET7 is the thickness of the seventh lens L7 at the maximum effective half aperture in the direction of the optical axis O. Specifically, CT7 / ET7 can be 0.3, 0.4, 0.5, 0.6, 0.7, or 0.75, etc. When the optical lens 100 satisfies the above relationship, by reasonably controlling the ratio of the thickness of the seventh lens L7 on the optical axis O and the edge thickness, not only can the high-order aberration generated by the optical lens 100 be effectively balanced, but also the field curvature adjustment of the seventh lens L7 is beneficial, thereby improving the imaging quality of the optical lens 100.

[0054] In some embodiments, the optical lens 100 satisfies a relationship: 55° / mm≤FOV / IMGH≤60° / mm; wherein FOV is the maximum field of view angle of the optical lens 100, and IMGH is the radius of the maximum effective imaging circle on the imaging surface IMG of the optical lens 100. Specifically, FOV / IMGH can be 55° / mm, 56° / mm, 57° / mm, 58° / mm, 59° / mm, or 60° / mm, etc. When the optical lens 100 satisfies the above relationship, the ratio of the maximum field of view angle and the half image height of the optical lens 100 can be reasonably configured, which is beneficial to not only expanding the field of view angle of the optical lens 100 to realize the wide-angle characteristic, so that the optical lens 100 can shoot a wider picture, but also increasing the imaging surface size of the optical lens 100, so that the optical lens 100 can match a larger size of photosensitive chip, thereby being beneficial to improving the pixel of the optical lens 100. In addition, the field of view angle of the optical lens 100 will not be too large, which is beneficial to the correction of the distortion aberration of the optical lens 100. Exceeding the upper limit of the above condition formula, the field of view angle of the optical lens 100 is too large, which leads to the difficulty in correcting the distortion aberration of the optical lens 100, thereby leading to the unclear imaging and the serious image distortion of the optical lens 100. Lower than the lower limit of the above condition formula, the field of view angle of the optical lens 100 is too small, which is difficult to meet the demand of large-range shooting.

[0055] In some embodiments, the optical lens 100 satisfies a relationship: 93° / mm≤FOV / F≤101° / mm; wherein FOV is a maximum field of view angle of the optical lens 100, and F is an effective focal length of the optical lens 100. Specifically, FOV / F can be 93° / mm, 95° / mm, 97° / mm, 98° / mm, 100° / mm, or 101° / mm, etc. When the optical lens 100 satisfies the above relationship, the field of view angle of the optical lens 100 is large, so as to effectively increase the framing area of the picture, while having certain macro capability, improve the capture capability of low-frequency details of the optical lens 100, and meet the design requirement of high image quality.

[0056] In some embodiments, the optical lens 100 satisfies a relationship: 0.6≤CTAL / TTL≤0.72; wherein CTAL is the sum of the thicknesses of all lenses from the first lens L1 to the eighth lens L9 on the optical axis O, and TTL is the distance from the object side S1 of the first lens L1 to the imaging surface IMG of the optical lens 100 on the optical axis O. Specifically, CTAL / TTL can be 0.6, 0.63, 0.66, 0.69, 0.71, or 0.72, etc. When the optical lens 100 satisfies the above relationship, the total length of the optical lens 100 can be effectively shortened under the condition of meeting high pixels and high imaging quality, so as to compress the overall length of the optical lens 100, so that the overall structure of the optical lens 100 is more compact, and the miniaturization and thinness design of the optical lens 100 is realized.

[0057] In some embodiments, the optical lens 100 satisfies a relationship: 0.55≤CT5 / CT6≤1.5; wherein CT5 is the thickness of the fifth lens L5 on the optical axis O, and CT6 is the thickness of the sixth lens L6 on the optical axis O. Specifically, CT5 / CT6 can be 0.55, 0.7, 0.9, 1.1, 1.3, or 1.5, etc. When the optical lens 100 satisfies the above relationship, the relationship between the thicknesses of the fifth lens L5 and the sixth lens L6 on the optical axis O can be limited, so as to ensure the uniform distribution of the thicknesses of the fifth lens L5 and the sixth lens L6 on the optical axis O, prevent the space distribution from being uneven due to too large thickness difference, and thus reduce the difficulty of structural arrangement and improve the yield of finished products.

[0058] In some embodiments, the optical lens 100 satisfies a relationship: 1≤F4 / F5≤2.1; wherein F4 is the effective focal length of the fourth lens L4, and F5 is the effective focal length of the fifth lens L5. Specifically, F4 / F5 can be 1, 1.2, 1.4, 1.6, 1.8, or 2.1, etc. When the optical lens 100 satisfies the above relationship, by reasonably configuring the ratio of the focal lengths of the fourth lens L4 and the fifth lens L5, the aberration can be corrected, and the imaging quality of the optical lens 100 is improved.

[0059] In some embodiments, the optical lens 100 satisfies a relationship: -4≤F2 / F≤-2.5; where F2 is the effective focal length of the second lens L2, and F is the effective focal length of the optical lens 100. Specifically, F2 / F can be -4, -3.5, -3.5, -3.1, -2.8, or -2.5, etc. When the optical lens 100 satisfies the above relationship, it is beneficial to reduce the refraction angle of light at the second lens L2, while enabling the negative refractive power provided by the second lens L2 to effectively balance the spherical aberration of the optical lens 100, effectively correct the aberration, and thus achieve good imaging quality. At the same time, it is also beneficial to reasonably configure the central thickness of the second lens L2, thereby shortening the total length of the optical lens 100, and additionally expanding the field of view of the optical lens 100.

[0060] In some embodiments, the optical lens 100 satisfies a relationship: -6≤F3 / F≤-3; where F3 is the effective focal length of the third lens L3, and F is the effective focal length of the optical lens 100. Specifically, F3 / F can be -6, -5.5, -5, -4.5, -4, or -3, etc. Since the light is emitted by the first lens L1 and the second lens L2 with strong refractive power, this often leads to a large field curvature when the edge field of view light is incident on the imaging surface IMG. Therefore, reasonably setting the effective focal length of the third lens L3 can effectively collect and compress the incident light in front, smoothly transition the light to the rear optical lens 100, reduce the generation of aberration, and thus improve the imaging quality of the optical lens 100.

[0061] In some embodiments, the optical lens 100 satisfies a relationship: 2.5≤F5 / F≤4.6; where F5 is the effective focal length of the fifth lens L5, and F is the effective focal length of the optical lens 100. Specifically, F5 / F can be 2.5, 2.8, 3, 3.5, 4, or 4.6, etc. When the optical lens 100 satisfies the above relationship, the exit angle of the light after being folded by the lens group can be reduced, thereby reducing the incident angle of the light incident on the photosensitive chip on the image side of the optical lens 100, and further improving the photosensitive performance of the photosensitive chip.

[0062] In some embodiments, the optical lens 100 satisfies a relationship: 1.9≤F6 / F≤3.3; where F6 is the effective focal length of the sixth lens L6, and F is the effective focal length of the optical lens 100. Specifically, F6 / F can be 1.9, 2.1, 2.3, 2.6, 2.9, or 3.3, etc. By limiting the relationship between the focal length of the sixth lens L6 and the effective focal length of the optical lens 100, it is helpful to correct the aberration of the optical lens 100, while reducing the temperature sensitivity of the optical lens 100, and thus improving the imaging quality of the optical lens 100.

[0063] In some embodiments, the optical lens 100 satisfies a relationship: -2.2≤F7 / F≤-1.2; where F7 is the effective focal length of the seventh lens L7, and F is the effective focal length of the optical lens 100. Specifically, F7 / F can be -2.2, -2, -1.8, -1.6, -1.4, or -1.2, etc. When the optical lens 100 satisfies the above relationship, the refractive power of the seventh lens L7 of the optical lens 100 will not become too strong, so that the angle between the normal lines of the object side S13 and the image side S14 of the seventh lens L7 and the incident light rays will not become too large, and the occurrence of high-order aberrations can be further inhibited.

[0064] In some embodiments, the optical lens 100 satisfies a relationship: 3≤F8 / F≤4; where F8 is the effective focal length of the eighth lens L8, and F is the effective focal length of the optical lens 100. Specifically, F8 / F can be 3, 3.2, 3.4, 3.6, 3.8, or 4, etc. By restricting the ratio of the focal length of the eighth lens L8 to the focal length of the optical lens 100, the aberrations that the sixth lens L6 and the seventh lens L7 cannot correct can be corrected, so as to balance the aberrations of the optical lens 100 and improve the imaging quality of the optical lens 100.

[0065] In some embodiments, the optical lens 100 satisfies a relationship: 2≤R1 / R2≤2.7; where R1 is the curvature radius of the object side S1 of the first lens L1 at the optical axis O, and R2 is the curvature radius of the image side S2 of the first lens L1 at the optical axis O. Specifically, R1 / R2 can be 2, 2.1, 2.2, 2.3, 2.5, or 2.7, etc. When the optical lens 100 satisfies the above relationship, the shape and curvature of the first lens L1 can be controlled, so as to effectively reduce the aberration introduction value of the incident light rays, promote the aberration balance of the optical lens 100, and at the same time, reduce the processing difficulty of the first lens L1, so as to facilitate the manufacturing of the first lens L1 and improve the processing process of the optical lens 100.

[0066] In some embodiments, the optical lens 100 satisfies a relationship: 0.25≤CT2 / ET2≤0.5; where CT2 is the thickness of the second lens L2 on the optical axis O, and ET2 is the thickness of the second lens L2 in the direction of the optical axis O at the maximum effective half aperture. Specifically, CT2 / ET2 can be 0.25, 0.3, 0.35, 0.4, 0.45, or 0.5, etc. When the optical lens 100 satisfies the above relationship, by reasonably controlling the ratio of the thickness of the second lens L2 on the optical axis O and the edge thickness, the aberrations generated by the lens itself can be balanced, and the imaging quality of the optical lens 100 can be improved.

[0067] In some embodiments, the optical lens 100 satisfies a relationship: 1.2≤CT5 / ET5≤1.7; wherein CT5 is the thickness of the fifth lens L5 on the optical axis O, and ET5 is the thickness of the fifth lens L5 at the maximum effective half aperture in the direction of the optical axis O. Specifically, CT5 / ET5 can be 1.2, 1.3, 1.4, 1.5, 1.6, or 1.7, etc. When the optical lens 100 satisfies the above relationship, by controlling the ratio relationship between the thickness of the fifth lens L5 on the optical axis O and the edge thickness, not only can the high-order aberration generated by the optical lens 100 be effectively balanced, but also the field curvature adjustment of the fifth lens L5 is beneficial, thereby improving the imaging quality of the optical lens 100.

[0068] In some embodiments, the optical lens 100 satisfies a relationship: 1.7≤CT6 / ET6≤3.1; wherein CT6 is the thickness of the sixth lens L6 on the optical axis O, and ET6 is the thickness of the sixth lens L6 at the maximum effective half aperture in the direction of the optical axis O. Specifically, CT6 / ET6 can be 1.7, 2, 2.5, 2.7, 2.9, or 3.1, etc. When the optical lens 100 satisfies the above relationship, by reasonably controlling the ratio relationship between the thickness of the sixth lens L6 on the optical axis O and the edge thickness, it is beneficial to balance the aberration generated by the lens itself, and to improve the imaging quality of the optical lens 100.

[0069] In some embodiments, the optical lens 100 satisfies a relationship: 1.2≤CT8 / ET8≤1.65; wherein CT8 is the thickness of the eighth lens L8 on the optical axis O, and ET8 is the thickness of the eighth lens L8 at the maximum effective half aperture in the direction of the optical axis O. Specifically, CT8 / ET8 can be 1.2, 1.3, 1.4, 1.5, 1.6, or 1.65, etc. When the optical lens 100 satisfies the above relationship, the thickness of the eighth lens L8 on the optical axis O and the edge thickness of the eighth lens L8 can be controlled within a reasonable range, thereby being beneficial to guarantee the material uniformity of the eighth lens L8, and further improving the uniformity of the imaging quality of the optical lens 100. Meanwhile, the processability of the eighth lens L8 can also be guaranteed, and the forming difficulty of the eighth lens L8 is reduced.

[0070] The surface type of each aspheric lens can be defined by, but not limited to, the following aspheric formula:

[0071]

[0072] wherein Z is the distance from a corresponding point on the aspheric surface to a plane tangent to the surface vertex, r is the distance from any point on the aspheric surface to the optical axis, c is the curvature of the aspheric vertex, c=1 / Y, Y is the radius of curvature (i.e., the near-axis curvature c is the inverse of the Y radius in Table 1), k is the conic constant, and Ai is the coefficient corresponding to the i-th high-order term in the aspheric surface formula.

[0073] The optical lens 100 of the present embodiment will be described in detail below in connection with specific parameters.

[0074] First Embodiment

[0075] The structure of the optical lens 100 disclosed by the first embodiment of the present application is shown in FIG. 1. The optical lens 100 comprises, in order from the object side to the image side along the optical axis O, a first lens L1 having a negative refractive power, a second lens L2 having a negative refractive power, a third lens L3 having a negative refractive power, a fourth lens L4 having a positive refractive power, a stop STO, a fifth lens L5 having a positive refractive power, a sixth lens L6 having a positive refractive power, a seventh lens L7 having a negative refractive power, an eighth lens L8 having a positive refractive power, an infrared filter IR, and a cover glass CG. Figure 1 Further, the object side surface S1 of the first lens L1 is convex at the vicinity of the optical axis O, and the image side surface S2 of the first lens L1 is concave at the vicinity of the optical axis O. The object side surface S3 of the second lens L2 is convex at the vicinity of the optical axis O, and the image side surface S4 of the second lens L2 is concave at the vicinity of the optical axis O. The object side surface S5 of the third lens L3 is concave at the vicinity of the optical axis O, and the image side surface S6 of the third lens L3 is concave at the vicinity of the optical axis O. The object side surface S7 of the fourth lens L4 is convex at the vicinity of the optical axis O, and the image side surface S8 of the fourth lens L4 is concave at the vicinity of the optical axis O. The object side surface S9 of the fifth lens L5 is convex at the vicinity of the optical axis O, and the image side surface S10 of the fifth lens L5 is convex at the vicinity of the optical axis O. The object side surface S11 of the sixth lens L6 is convex at the vicinity of the optical axis O, and the image side surface S12 of the sixth lens L6 is convex at the vicinity of the optical axis O. The object side surface S13 of the seventh lens L7 is concave at the vicinity of the optical axis O, and the image side surface S14 of the seventh lens L7 is concave at the vicinity of the optical axis O. The object side surface S15 of the eighth lens L8 is convex at the vicinity of the optical axis O, and the image side surface S16 of the eighth lens L8 is convex at the vicinity of the optical axis O.

[0076]

[0077] ​Specifically, along the optical axis O of the optical lens 100, the elements are arranged in the order of the elements in Table 1a from top to bottom in sequence from the object side to the image side. In the same lens, the surface with the smaller surface serial number is the object side surface of the lens, and the surface with the larger surface serial number is the image side surface of the lens, such as the object side surface S1 and the image side surface S2 of the first lens L1 corresponding to the surface serial numbers 1 and 2 respectively. The Y radius in Table 1a is the radius of curvature of the object side surface or the image side surface with the corresponding surface serial number at the optical axis O. The first value in the "thickness" parameter column of the lens is the thickness of the lens at the optical axis O, and the second value is the distance from the image side surface of the lens to the vertex of the next surface at the optical axis O. The value in the "thickness" parameter column of the stop STO is the distance from the stop STO to the vertex of the next surface at the optical axis O, and the positive direction of the optical axis O is from the object side surface S1 of the first lens L1 to the image side surface of the last lens. When the value is negative, it indicates that the stop STO is arranged on the image side of the vertex of the next surface. If the thickness of the stop STO is positive, the stop STO is on the object side of the vertex of the next surface. It can be understood that the units of the Y radius, the thickness and the effective focal length in Table 1a are mm. The reference wavelength of the refractive index and the Abbe number of each lens in Table 1a is 587.56 nm, and the reference wavelength of the effective focal length is 546 nm.

[0078] In the first embodiment, the object side surface S9 and the image side surface S10 of the fifth lens L5 are both aspherical surfaces, and the object side surface S15 and the image side surface S16 of the eighth lens L8 are both aspherical surfaces. Table 1b shows the conic constant k, the high-order term coefficients A4, A6, A8, A10, A12, A14 and A16 of the aspherical surfaces that can be used in the first embodiment.

[0079] Table 1a

[0080]

[0081]

[0082] Table 1b

[0083]

[0084] Please refer to Figure 2 (A), Figure 2 (A) of FIG. 1 shows the longitudinal spherical aberration of the optical lens 100 in the first embodiment at wavelengths of 940 nm, 656 nm, 588 nm, 546 nm, 486 nm, 436 nm and 415 nm respectively. Among them, the abscissa along the X axis represents the focal point offset, and the unit is mm. The ordinate along the Y axis represents the normalized field of view. From Figure 2 (A) of FIG. 1, it can be seen that the spherical aberration value of the optical lens 100 in the first embodiment is better, which indicates that the imaging quality of the optical lens 100 in the embodiment is better.

[0085] See also Figure 2 (B) in Figure 2 (B) in the figure shows the astigmatism diagram of the optical lens 100 in the first embodiment at a wavelength of 546 nm. The horizontal axis along the X-axis represents the focus offset in mm, and the vertical axis along the Y-axis represents the field angle in degrees. In the astigmatism diagram, T represents the curvature of the imaging surface IMG in the sub-arc direction, and S represents the curvature of the imaging surface IMG in the sagittal direction. Figure 2 As can be seen from (B) in FIG. 1 , at this wavelength, the astigmatism of the optical lens 100 is well compensated.

[0086] See also Figure 2 (C) in Figure 2 (C) shows the distortion curve of the optical lens 100 in the first embodiment at a wavelength of 546 nm. The horizontal axis along the X-axis represents the distortion, and the vertical axis along the Y-axis represents the field angle, with the unit being deg. Figure 3 As can be seen from (C) in FIG. 1 , at this wavelength, the distortion of the optical lens 100 is well corrected.

[0087] Second embodiment

[0088] The structural diagram of the optical lens 100 disclosed in the second embodiment of the present application is as follows: Figure 4 As shown, the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture STO, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a filter IR and a protective glass CG, which are arranged in sequence along the optical axis O from the object side to the image side.

[0089] Furthermore, in the second embodiment, the refractive power and the surface shape of each lens are consistent with those of the first embodiment.

[0090] The other parameters in the second embodiment are given in the following Table 2a, and the definitions of the parameters can be derived from the description of the above embodiment and are not repeated here.

[0091] Table 2a

[0092]

[0093]

[0094] Table 2b

[0095]

[0096] See also Figure 4 ,Depend on Figure 4(A) longitudinal spherical aberration graph, (B) astigmatism graph and (C) distortion curve graph in FIG. 10A, FIG. 10B and FIG. 10C respectively, it can be seen that the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 in the second embodiment are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, the wavelengths corresponding to the curves in (A), Figure 4 Figure 4 Figure 2 Figure 2 Figure 2 Figure 5

[0097] Third Embodiment

[0098] The structural schematic diagram of the optical lens 100 disclosed by the third embodiment of the present application is shown in FIG. 11A, FIG. 11B and FIG. 11C, which comprises, in order from the object side to the image side along the optical axis O, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a stop STO, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, an infrared filter IR and a cover glass CG. Figure 6 Further, in the third embodiment, the refractive power and surface shape of each lens are consistent with those of the first embodiment.

[0099]

[0100] The other parameters in the third embodiment are given in Table 3a below, and the definitions of the parameters can be obtained from the foregoing description of the embodiments, which will not be repeated here.

[0101] Table 3a Table 3b

[0102]

[0103] Please refer to Figure 6 , from(A) longitudinal spherical aberration graph, (B) astigmatism graph and (C) distortion curve graph in FIG. 10A, FIG. 10B and FIG. 10C respectively, it can be seen that the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 in the second embodiment are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, the wavelengths corresponding to the curves in (A), Figure 6 Figure 6 Figure 2 Figure 2 Figure 2 Figure 7 ​​​​​​​​​​​​​

[0104] Fourth embodiment

[0105] The structural diagram of the optical lens 100 disclosed in the fourth embodiment of the present application is as follows: Figure 8 As shown, the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture STO, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a filter IR and a protective glass CG, which are arranged in sequence along the optical axis O from the object side to the image side.

[0106] Furthermore, in the fourth embodiment, the refractive power and surface shape of each lens are consistent with those of the third embodiment.

[0107] The other parameters in the fourth embodiment are given in the following Table 4a, and the definitions of the parameters can be derived from the description of the above embodiments and are not repeated here.

[0108] Table 4a Table 4b

[0109]

[0110] See also Figure 8 ,Depend on Figure 8 As can be seen from the longitudinal spherical aberration diagram (A), astigmatism diagram (B), and distortion curve diagram (C), the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 in the fourth embodiment are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. Figure 8 (A) Figure 8 Middle (B) and Figure 2 The wavelengths corresponding to the curves in (C) can be referred to the wavelengths in the first embodiment. Figure 2 (A) in Figure 2 (B) in Figure 9 The contents described in (C) will not be repeated here.

[0111] Fifth embodiment

[0112] The structural diagram of the optical lens 100 disclosed in the fifth embodiment of the present application is as follows: Figure 10 As shown, the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture STO, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a filter IR and a protective glass CG, which are arranged in sequence along the optical axis O from the object side to the image side.

[0113] Furthermore, in the fifth embodiment, the refractive power and surface shape of each lens are consistent with those of the first embodiment.

[0114] The other parameters in the fifth embodiment are given in the following Table 5a, and the definitions of the parameters can be derived from the description of the above embodiments and are not repeated here.

[0115] Table 5a

[0116]

[0117] Table 5b

[0118]

[0119]

[0120] See also Figure 10 ,Depend on Figure 10 As can be seen from the longitudinal spherical aberration diagram (A), astigmatism diagram (B), and distortion curve diagram (C), the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 in the fifth embodiment are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. Figure 10 (A) Figure 10 Middle (B) and Figure 2 The wavelengths corresponding to the curves in (C) can be referred to the wavelengths in the first embodiment. Figure 2 (A) in Figure 2 (B) in Figure 11 The contents described in (C) will not be repeated here.

[0121] Table 6 shows the values ​​of multiple relational expressions in the optical lens 100 according to the first to fifth embodiments.

[0122] Table 6

[0123]

[0124]

[0125] See also Figure 12 The embodiment of the present application further discloses a camera module 200, which includes a photosensitive chip 201 and the above-mentioned optical lens 100. The photosensitive chip 201 is arranged on the image side of the optical lens 100. The optical lens 100 is used to receive the light signal of the subject and project it onto the photosensitive chip 201. The photosensitive chip 201 is used to convert the light signal corresponding to the subject into an image signal, which will not be described in detail here. The camera module 200 with the optical lens 100 can enable the optical lens 100 to have the characteristics of a large field of view, thereby improving the imaging quality of the optical lens 100.

[0126] Referring to ​ The embodiment of the present application also discloses a terminal device 300, which comprises a shell 301 and the camera module 200 described above, and the camera module 200 is arranged on the shell 301. The terminal device 300 can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a smart watch, a monitor, a car, a vehicle-mounted device, a drone, a monitoring device and the like. It can be understood that the electronic device 300 with the camera module 200 described above also has all the technical effects of the optical lens 100 described above, that is, the optical lens 100 can have the characteristic of a large field of view, and the imaging quality of the optical lens 100 is improved.

[0127] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application rather than limit the present application. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. An optical lens, characterized in that: There are eight lenses with refractive power, including the following from the object side to the image side along the optical axis: The first lens has negative refractive power, with a convex object-side surface near the optical axis and a concave image-side surface near the optical axis; The second lens element has negative refractive power, with a convex object-side surface near the optical axis and a concave image-side surface near the optical axis; The third lens has negative refractive power, and both the object side and the image side are concave near the optical axis; The fourth lens element has positive refractive power, with a convex object-side surface near the optical axis and a concave image-side surface near the optical axis; The fifth lens has positive refractive power, and both the object-side and image-side surfaces are convex near the optical axis; The sixth lens element has positive refractive power, and both the object-side and image-side surfaces are convex near the optical axis; The seventh lens has negative refractive power, and both the object-side and image-side surfaces are concave near the optical axis; The eighth lens element has positive refractive power, and both the object-side and image-side surfaces are convex near the optical axis; The optical lens satisfies the following relationship: 190°≤FOV≤200°;1.85≤FNO≤2.1;0.3≤CT7 / ET7≤0.75; Among them, FOV is the maximum field of view of the optical lens, FNO is the aperture number of the optical lens, CT7 is the thickness of the seventh lens on the optical axis, and ET7 is the thickness of the seventh lens at its maximum effective semi-aperture in the direction of the optical axis.

2. The optical lens according to claim 1, wherein: The optical lens satisfies the following relationship: 9.5≤TTL / IMGH≤12; and / or, 16≤TTL / F≤20; and / or, 1.6≤IMGH / F≤1.75; Wherein, TTL is the distance from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis, IMGH is the radius of the maximum effective imaging circle on the imaging surface of the optical lens, and F is the effective focal length of the optical lens.

3. The optical lens according to claim 1, wherein: The optical lens satisfies the following relationship: -8≤F1 / F≤-6; and / or, 4≤F4 / F≤7; and / or, -20≤F67 / F≤-4; and / or, -0.4≤F1234 / F678≤-0.15; Among them, F1 is the effective focal length of the first lens, F is the effective focal length of the optical lens, F4 is the effective focal length of the fourth lens, F67 is the combined effective focal length of the sixth lens and the seventh lens, F1234 is the combined effective focal length of the first lens, the second lens, the third lens and the fourth lens, and F678 is the combined effective focal length of the sixth lens, the seventh lens and the eighth lens.

4. The optical lens according to claim 1, wherein: The optical lens satisfies the following relationship: -5≤R5 / R6≤-1; and / or, 0.1≤R7 / R8≤0.55; and / or, -0.9≤R9 / R10≤-0.2; and / or, -2≤R11 / R12≤-0.7; Among them, R5 is the curvature radius of the object side surface of the third lens at the optical axis, R6 is the curvature radius of the image side surface of the third lens at the optical axis, R7 is the curvature radius of the object side surface of the fourth lens at the optical axis, R8 is the curvature radius of the image side surface of the fourth lens at the optical axis, R9 is the curvature radius of the object side surface of the fifth lens at the optical axis, R10 is the curvature radius of the image side surface of the fifth lens at the optical axis, R11 is the curvature radius of the object side surface of the sixth lens at the optical axis, and R12 is the curvature radius of the image side surface of the sixth lens at the optical axis.

5. The optical lens according to claim 1, wherein: The optical lens satisfies the following relationship: -10≤F2 / CT2≤-4; and / or, -3≤F3 / CT3≤-1; and / or, 1≤F8 / CT8≤2.5; Wherein, F2 is the effective focal length of the second lens, CT2 is the thickness of the second lens on the optical axis, F3 is the effective focal length of the third lens, CT3 is the thickness of the third lens on the optical axis, F8 is the effective focal length of the eighth lens, and CT8 is the thickness of the eighth lens on the optical axis.

6. The optical lens according to claim 1, wherein: The optical lens satisfies the following relationship: 5≤SD1 / F≤6.2; and / or, 0.6≤SD9 / SD16≤0.75; and / or, 0.8≤SD4 / CT23≤1; and / or, 4.5≤SD7 / SAG7≤6.8; Among them, SD1 is half of the maximum effective aperture of the object side surface of the first lens, F is the effective focal length of the optical lens, SD9 is half of the maximum effective aperture of the object side surface of the fifth lens, SD16 is half of the maximum effective aperture of the image side surface of the eighth lens, SD4 is half of the maximum effective aperture of the image side surface of the second lens, CT23 is the distance between the image side surface of the second lens and the object side surface of the third lens on the optical axis, SD7 is half of the maximum effective aperture of the object side surface of the fourth lens, and SAG7 is the distance from the maximum effective half aperture of the object side surface of the fourth lens to the intersection of the object side surface of the first lens and the optical axis in the direction of the optical axis.

7. The optical lens according to claim 1, wherein: The optical lens satisfies the following conditional formula: 0.65≤CT3 / ET3≤0.9; and / or, 1≤CT4 / ET4≤1.1; Wherein, CT3 is the thickness of the third lens on the optical axis, ET3 is the thickness of the third lens at its maximum effective semi-aperture in the direction of the optical axis, CT4 is the thickness of the fourth lens on the optical axis, and ET4 is the thickness of the fourth lens at its maximum effective semi-aperture in the direction of the optical axis.

8. The optical lens according to claim 1, wherein: The optical lens satisfies the following conditional formula: 55° / mm≤FOV / IMGH≤60° / mm; and / or, 93° / mm≤FOV / F≤101° / mm; and / or, 0.6≤CTAL / TTL≤0.72; Wherein, IMGH is the radius of the maximum effective imaging circle on the imaging plane of the optical lens, F is the effective focal length of the optical lens, CTAL is the sum of the thicknesses of all lenses from the first lens to the eighth lens on the optical axis, and TTL is the distance from the object side of the first lens to the imaging plane of the optical lens on the optical axis.

9. A camera module, characterized in that: The camera module includes a photosensitive chip and an optical lens as described in any one of claims 1 to 8, and the photosensitive chip is arranged on the image side of the optical lens.

10. A terminal device, characterized in that: It comprises a shell and a camera module as claimed in claim 9, wherein the camera module is arranged in the shell.

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