Optical lens, camera module and terminal equipment

Abstract

An optical lens, a camera module and a terminal device relate to the technical field of optical imaging, and comprise eight lenses with refractive power, and from an object side to an image side along an optical axis: a first lens with negative refractive power, an object side surface being a convex surface at a paraxial region, and an image side surface being a concave surface at a paraxial region; a second lens element with negative refractive power having an object-side surface being convex in a paraxial region and an image-side surface being concave in a paraxial region; a third lens element with negative refractive power, an object-side surface and an image-side surface being concave in a paraxial region; a fourth lens element with positive refractive power having an object-side surface being convex in a paraxial region and an image-side surface being concave in a paraxial region; a fifth lens element with positive refractive power; a sixth lens element with positive refractive power, an object-side surface and an image-side surface being convex in a paraxial region; a seventh lens element with negative refractive power; an eighth lens element with positive refractive power; the optical lens satisfies the following relational expressions: FOV is more than or equal to 190 degrees and less than or equal to 200 degrees; 1.85 < = FNO < = 2.1. The optical lens has the characteristic of large field angle, and the imaging quality of the optical lens is improved.

Description

Technical Field

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

[0002] A wide-angle lens is a lens that can capture a wider viewing angle. It is widely used in surveillance or vehicle-mounted cameras. With the rapid development of the automotive industry and people's increasing attention to driving safety and driving experience, vehicle-mounted vision systems play an increasingly critical role in modern cars. During driving, drivers need to have a comprehensive and accurate perception of the vehicle's surroundings in order to make timely and appropriate driving decisions. The viewing angle of traditional vehicle-mounted lenses is relatively limited, making it difficult to meet the demand for wide-field monitoring in complex and changing traffic scenarios, and the image quality is low. Summary of the invention

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

[0004] In order to achieve the above-mentioned purpose, in the first aspect, the present application discloses an optical lens, which has a total of eight lenses with refractive power, which include, in order from the object side to the image side along the optical axis: a first lens having negative refractive power, the object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis; a second lens having negative refractive power, the object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis; a third lens having negative refractive power, the object side surface is concave at the near optical axis, and the image side surface is concave at the near optical axis; a fourth lens having positive refractive power, the object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis; a fifth lens having positive refractive power , the object side surface is convex at the near optical axis, and the image side surface is convex at the near optical axis; the sixth lens has positive refractive power, the object side surface is convex at the near optical axis, and the image side surface is convex at the near optical axis; the seventh lens has negative refractive power, the object side surface is concave at the near optical axis, and the image side surface is concave at the near optical axis; the eighth lens has positive refractive power, the object side surface is convex at the near optical axis, and the image side surface is convex at the near 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] In the optical lens provided by the present application, by making the first lens have negative refractive power, and the object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis, it is beneficial to capture the large-angle light incident on the first lens, thereby achieving the effect of wide-angle photography, and is beneficial for the optical lens to cover a wide viewing angle range. The object side surface of the second lens is convex at the near optical axis, the image side surface is concave at the near optical axis, and has negative refractive power, which is beneficial to share the negative refractive power pressure of the first lens, so that the large-angle light of the first lens is smoothly incident on the second lens at a reasonable angle, and at the same time, the aberration caused by the large field angle light of the first lens can be corrected. The object side surface of the third lens is concave at the near optical axis, the image side surface is concave at the near optical axis, and has 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 of the first lens is smoothly incident on the third lens at a reasonable angle. The object side surface of the fourth lens is convex at the near optical axis, the image side surface is concave at the near optical axis, and has positive refractive power, which can offset the aberrations generated by the object side lens (i.e., the first lens to the third lens) with negative refractive power. At the same time, the positive and negative refractive power lenses of the third lens and the fourth lens can offset each other's phase difference, that is, the fourth lens with positive refractive power is conducive to correcting the aberrations generated by the third lens, thereby reducing the field curvature of the optical lens. The fifth lens has positive refractive power, and the surface design of the convex surface of the object side surface at the near optical axis and the convex surface design of the image side surface at the near optical axis are conducive to enhancing the positive refractive power of the fifth lens, facilitating the convergence of incident light at a large angle, so as to shorten the total length of the optical lens system. The sixth lens with positive refractive power and the seventh lens with negative refractive power are conducive to correcting the coma of the optical lens. In addition, the object side surface of the sixth lens is convex at the near optical axis, and the image side surface is convex at the near optical axis. The object side surface and the image side surface of the seventh lens are concave at the near optical axis, which are conducive to correcting the spherical aberration, astigmatism, field curvature and distortion of the optical lens. The combination of positive and negative refractive power lenses can offset the phase difference generated by each other, that is, the seventh lens with negative refractive power is conducive to correcting the aberration generated by the sixth lens, thereby reducing the field curvature of the optical lens. The eighth lens with positive refractive power has convex surfaces on both the object side surface and the image side surface, which can increase the relative illumination and improve the brightness of the imaging surface.

[0006] When 190°≤FOV≤200°, the optical lens has a larger 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 the characteristics of a large aperture, and the optical lens has sufficient light intake, which can make the image taken by the optical lens clearer, so that it can be suitable for shooting high-quality night scenes, starry sky and other object space scenes with low brightness. In addition, it can also avoid introducing excessive aberrations, so that the optical lens achieves an overall balance.

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

[0008] In a third aspect, the present application discloses a terminal device, comprising a housing and a camera module as described in the second aspect, wherein the camera module is arranged in the housing. The electronic device having the camera module can enable the optical lens to have the characteristic of a large field of view, thereby improving the imaging quality of the optical lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the structure of the optical lens disclosed in the first embodiment of the present application.

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

[0011] Figure 3 It is a schematic diagram of the structure of the optical lens disclosed in the second embodiment of the present application.

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

[0013] Figure 5 It is a schematic diagram of the structure of the optical lens disclosed in the third embodiment of the present application.

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

[0015] Figure 7 It is a schematic diagram of the structure of the optical lens disclosed in the fourth embodiment of the present application.

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

[0017] Fig. 9 It is a schematic diagram of the structure of the optical lens disclosed in the fifth embodiment of the present application.

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

[0019] Fig.11 It is a structural schematic diagram of the camera module disclosed in this application.

[0020] Fig.12 It is a schematic diagram of the structure of the terminal device disclosed in this application.

[0021] Description of main component symbols: 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 surfaces S1, S3, S5, S7, S9, S11, S13, S15, image side surfaces S2, S4, S6, S8, S10, S12, S14, S16, aperture STO, filter IR, protective glass CG, imaging surface IMG, camera module 200, photosensitive chip 201, terminal device 300, housing 301. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] First, see Figure 1 The embodiment of the present application discloses an optical lens 100, which has a total of eight lenses with refractive power, which are, from the object side to the image side along the optical axis O, 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 a convex surface at the near optical axis O, and the image-side surface S2 of the first lens L1 is a concave surface at the near optical axis O. The object-side surface S3 of the second lens L2 is a convex surface at the near optical axis O, and the image-side surface S3 of the second lens L2 is a concave surface at the near optical axis O. The object-side surface S5 of the third lens L3 is a concave surface at the near optical axis O, and the image-side surface S6 of the third lens L3 is a concave surface at the near optical axis O. The object-side surface S7 of the fourth lens L4 is a convex surface at the near optical axis O, and the image-side surface S8 of the fourth lens L4 is a concave surface at the near optical axis O. The object-side surface S9 of the fifth lens L5 is a convex surface at the near optical axis O, and the image-side surface S10 of the fifth lens L5 is a convex surface at the near optical axis O; the object-side surface S11 of the sixth lens L6 is a convex surface at the near optical axis O, and the image-side surface S13 of the sixth lens L6 is a convex surface at the near optical axis O. The object-side surface S13 of the seventh lens L7 is concave at the near optical axis O, and the image-side surface S14 of the seventh lens L7 is concave at the near optical axis O. The object-side surface S15 of the eighth lens L8 is convex at the near optical axis O, and the image-side surface S16 of the eighth lens L8 is concave at the near optical axis O.

[0025] In the optical lens 100 provided in the embodiment of the present application, by making the first lens L1 have negative refractive power, and the object side surface S1 is convex at the near optical axis O, and the image side surface S2 is concave at the near optical axis O, it is helpful to capture the large-angle light incident on the first lens L1, so as to achieve the effect of wide-angle photography, and it is helpful for the optical lens 100 to cover a wide viewing angle range. The object side surface S3 of the second lens L2 is convex at the near optical axis O, and the image side surface S4 is concave at the near optical axis O, and has negative refractive power, which is helpful to share the negative refractive power pressure of the first lens L1, so that the large-angle light of the first lens L1 is smoothly incident on the second lens L2 at a reasonable angle, and at the same time, the aberration caused by the large field angle light of the first lens L1 can be corrected. The object side surface S5 of the third lens L3 is concave at the near optical axis O, and the image side surface S6 is concave at the near optical axis O, and has negative refractive power, which can further share the negative refractive pressure of the first lens L1 and the second lens L2, so that the large-angle light of the first lens L1 is smoothly incident on the third lens L3 at a reasonable angle. The object side surface S7 of the fourth lens L4 is convex at the near optical axis O, and the image side surface S8 is concave at the near optical axis O, and has positive refractive power, which can offset the aberrations generated by the object side lenses (i.e., the first lens L1 to the third lens L3) with negative refractive power. At the same time, the positive and negative refractive power of the third lens 3L and the fourth lens L4 can offset each other's phase difference, that is, the fourth lens L4 with positive refractive power is conducive to correcting the aberrations generated 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 surface design of the object side surface 9 being convex at the near optical axis O and the surface design of the image side surface S10 being convex at the near optical axis O are conducive to enhancing the positive refractive power of the fifth lens L5, facilitating the convergence of incident light at a large angle, and thus facilitating shortening the total length of the optical lens system 100. The sixth lens L6 having positive refractive power and the seventh lens L7 having negative refractive power are conducive to correcting the coma aberration of the optical lens 100. In addition, the object side surface S11 of the sixth lens L6 is convex at the near optical axis O, the image side surface S12 is convex at the near optical axis O, and the object side surface S13 and the image side surface S14 of the seventh lens L7 are concave at the near optical axis O, which are conducive to correcting the spherical aberration, astigmatism, field curvature and distortion of the optical lens 100. The combination of lenses with positive and negative refractive powers can offset the phase difference generated by each other, that is, the seventh lens L7 with negative refractive power is conducive to correcting the aberration generated 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 surfaces on its object-side surface S15 and image-side surface S16, which can increase relative illumination and improve the brightness of the imaging surface.

[0026] In some embodiments, when the optical lens 100 is applied to electronic devices such as vehicle-mounted devices, driving recorders, or on automobiles, 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 a good optical effect and can also reduce the influence of temperature on the above lenses. Of course, among the multiple lenses of the optical lens 100, some lenses can be made of glass and some lenses can be made of plastic, so that while ensuring that the influence of temperature on the lens is reduced to achieve a better imaging effect, the processing cost of the lens and the weight of the lens can be 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 electronic devices such as smart phones and smart tablets, 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 be convenient for flexible design of the lens surface shape, the imaging resolution capability of the optical lens 100 is improved. The aspherical lens can make the object side or image side of the lens have a more flexible design, so that the lens can well solve the undesirable phenomena such as unclear imaging, distorted vision or narrow field of view when the lens is small and thin, and the optical lens 100 can have good imaging quality without 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 are aspherical lenses. In this way, through the combination of spherical and aspherical surfaces, not only can the processability of each lens be improved, which is beneficial to the surface design, but also the object side or image side of the lens can have a more flexible design, so that each lens can solve the undesirable phenomena such as unclear imaging, distorted field of view or narrow field of view in a small size and thinner condition, and the optical lens 100 can have good imaging quality without too many lenses, which is beneficial to shorten the length of the optical lens 100. It can be understood that in other embodiments, the surfaces of each lens in the optical lens 100 can be all spherical, all aspherical or any combination of spherical and aspherical surfaces, which can be selected according to actual needs, so it is not specifically limited in this embodiment.

[0028] In some embodiments, the optical lens 100 further includes a stop STO, which may be an aperture stop and / or a field stop. For example, the stop STO may be an aperture stop, or the stop STO may be a field stop, or the stop STO may be an aperture stop and a field stop. By setting the stop STO between the image side surface S8 of the fourth lens L4 and the object side surface S9 of the fifth lens L5, the exit pupil can be moved 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 is understandable that in other embodiments, the stop STO may also be set between other lenses, and the setting may be adjusted according to actual conditions, and this embodiment does not specifically limit this.

[0029] In some embodiments, the optical lens 100 further includes a filter IR, and the filter IR is disposed between the eighth lens L8 and the imaging surface IMG of the optical lens 100. Optionally, the filter IR may be a double-pass filter, which can simultaneously transmit visible light with high transmittance and partially transmit infrared light, thereby achieving selection of different wavebands, and can achieve both visible light imaging and infrared imaging, thereby achieving day and night versatility. It is understandable that the filter IR may be made of plastic, or may be made of optical glass coating, or an infrared filter IR of other materials, which may be selected according to actual needs and is not specifically limited in this embodiment.

[0030] In some embodiments, the optical lens 100 further includes a protective glass CG, which is disposed between the filter IR and the imaging surface IMG of the optical lens 100, so as to protect and prevent dust from the photosensitive chip. The protective glass CG may be made of plastic, or may be made of optical glass coating, or protective glass CG of other materials, which may be selected according to actual needs and is not specifically limited in this embodiment. It is understandable that the protective glass CG may be a part of the optical lens 100, or may 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 of the optical lens 100. Specifically, FOV may 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, which is beneficial for the optical lens 100 to acquire more scene content, thereby enriching the imaging information of the optical lens 100.

[0032] In some embodiments, the optical lens 100 satisfies the relationship: 1.85≤FNO≤2.1; wherein FNO is the aperture number of the optical lens 100. Specifically, 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, it has the characteristics of a large aperture, and the optical lens 100 has a sufficient amount of light input, which can make the image captured by the optical lens 100 clearer, so that it can be suitable for shooting high-quality night scenes, starry sky and other object space scenes with low brightness. In addition, it can also avoid introducing excessive aberrations, so that the optical lens 100 achieves an overall balance.

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

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

[0035] In some embodiments, the optical lens 100 satisfies the relationship: 1.6≤IMGH / F≤1.75; wherein IMGH is the radius of the maximum effective imaging circle on the imaging surface IMG of the optical lens 100, and F is the 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 help control the focal length of the optical lens 100 within a reasonable range, and ensure that the optical lens 100 has a sufficient light-collecting area and a sufficient field of view angle, thereby simultaneously satisfying the characteristics of a large field of view angle and a large image surface.

[0036] In some embodiments, the optical lens 100 satisfies the relationship: -8≤F1 / F≤-6; wherein F1 is the effective focal length of the first lens L1, and F is the 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. For the entire optical lens 100, the refractive power of the first lens L1 will not be too strong, so as to avoid introducing too much spherical aberration, and the optical lens 100 has good imaging quality.

[0037] In some embodiments, the optical lens 100 satisfies the relationship: 4≤F4 / F≤7; wherein F4 is the effective focal length of the fourth lens L4, and F is the effective focal length of the optical lens 100. Specifically, F4 / F can be 4, 4.5, 5, 5.5, 6 or 7. When the optical lens 100 satisfies the above relationship, the fourth lens L4 provides a portion 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. The fourth lens L4 forms a Gaussian-like structure with the first lens L1, the second lens L2 and the third lens L3, which can balance the distortion generated by the first lens L1, the second lens L2 and the third lens L3, avoid high-order aberrations caused by excessive refractive index, and thus improve the imaging quality of the optical lens 100.

[0038] In some embodiments, the optical lens 100 satisfies the relationship: -20≤F67 / F≤-4; wherein F is the effective focal length of the optical lens 100, F4 is the effective focal length of the fourth lens L4, and F67 is the 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 and reasonably configuring 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 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 the relationship: -0.4≤F1234 / F678≤-0.15; wherein F1234 is the 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 the 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 combined effective focal length of the first lens L1, the second lens L2, the third lens L3 and the fourth lens L4 and the ratio of the combined effective focal length of the sixth lens L6, the seventh lens L7 and the eighth lens L8 can be reasonably set, so that the first lens L1, the second lens L2, the third lens L3 and the fourth lens L4 can collect light in a larger angle range, and the sixth lens L6, the seventh lens L7 and the eighth lens L8 can effectively converge the edge light of the center and the vicinity of the field of view, thereby making the structure of the optical lens 100 more compact, which is conducive to shortening the total length of the optical lens 100 system and meeting the requirements of miniaturization design of electronic equipment; in addition, the sixth lens L6, the seventh lens L7 and the eighth lens L8 as a whole can also effectively correct the aberrations of the first lens L1, the second lens L2, the third lens L3 and the fourth lens L4, so as to improve the imaging quality of the optical lens 100.

[0040] In some embodiments, the optical lens 100 satisfies the relationship: -5≤R5 / R6≤-1; wherein R5 is the radius of curvature of the object side surface S5 of the third lens L3 at the optical axis O, and R6 is the radius of curvature of the image side surface 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 radius of curvature and the surface shape of the object side surface S5 and the image side surface S6 of the third lens L3 can be optimized, which is beneficial for the third lens L3 to reasonably cooperate 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, it is beneficial to correct the optical path direction from the third lens L3 to the fourth lens L4, thereby reducing the generation of optical distortion.

[0041] In some embodiments, the optical lens 100 satisfies the relationship: 0.1≤R7 / R8≤0.55; wherein R7 is the radius of curvature of the object side surface S7 of the fourth lens L4 at the optical axis O, and R8 is the radius of curvature of the image side surface 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, it is beneficial to correct the aberrations generated by the optical lens 100, so that the refractive power of each lens of the optical lens 100 in the direction perpendicular to the optical axis O is uniformly configured, the distortion and aberration generated by the front lens are greatly corrected, and at the same time, excessive bending of the fourth lens L4 is avoided, and it is easy to form and manufacture.

[0042] In some embodiments, the optical lens 100 satisfies the relationship: -0.9≤R9 / R10≤-0.2; wherein R9 is the radius of curvature of the object side surface S9 of the fifth lens L5 at the optical axis O, and R10 is the radius of curvature of the image side surface S10 of the fifth lens L5 at the optical axis O. Specifically, R9 / R10 may be -0.9, -0.7, -0.5, -0.4, -0.3 or -0.2, etc. When the optical lens 100 satisfies the above conditional formula, the surface shape of the fifth lens L5 can be reasonably controlled, and the astigmatism contribution of the fifth lens L5 can be effectively controlled to ensure the imaging quality of the intermediate field of view, which is conducive to correcting the aberration of the optical lens 100 and ensuring the balance of the distortion of the optical lens 100. At the same time, it is prevented that the surface shapes of the object side surface S9 and the image side surface S10 of the fifth lens L5 at the optical axis O are too curved, which is conducive to reducing the processing difficulty of the fifth lens L5 and improving the yield rate of the fifth lens L5.

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

[0044] In some embodiments, the optical lens 100 satisfies the relationship: -10≤F2 / CT2≤-4; wherein F2 is the effective focal length of the second lens L2, and CT2 is the thickness of the second lens L2 on 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 thickness of the second lens L2 can be reasonably configured, so that the incident angle of the light in the optical lens 100 can be effectively controlled, the sensitivity of the optical lens 100 can be reduced, and it is beneficial to correct the aberration generated by the optical lens 100, thereby facilitating the improvement of the imaging quality of the optical lens 100.

[0045] In some embodiments, the optical lens 100 satisfies the relationship: -3≤F3 / CT3≤-1; wherein F3 is the effective focal length of the third lens L3, and CT3 is the thickness of the third lens L3 on 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 thickness of the third lens L3 can be reasonably configured, so that the light can enter the optical lens 100 more smoothly, reduce the sensitivity of the optical lens 100, and help correct the aberrations generated by the optical lens 100, thereby helping to improve the imaging quality of the optical lens 100.

[0046] In some embodiments, the optical lens 100 satisfies the relationship: 1≤F8 / CT8≤2.5; wherein F8 is the effective focal length of the eighth lens L8, and CT8 is the thickness of the eighth lens L8 on the optical axis O. Specifically, F8 / CT8 may 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 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 may be reduced, thereby reducing the difficulty of the processing 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 the relationship: 5≤SD1 / F≤6.2; wherein SD1 is half of the maximum effective aperture of the object side surface S1 of the first lens L1, and F is the 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 conditional formula, the maximum effective aperture of the object side surface 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 smaller, which is conducive to a smaller head of the manufactured optical lens 100.

[0048] In some embodiments, the optical lens 100 satisfies the relationship: 0.6≤SD9 / SD16≤0.75; wherein SD9 is half of the maximum effective aperture of the object side surface S9 of the fifth lens L5, and SD16 is half of the maximum effective aperture of the image side surface 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 conditional formula, 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 both wide-angle characteristics and miniaturized design.

[0049] In some embodiments, the optical lens 100 satisfies the relationship: 0.8≤SD4 / CT23≤1; wherein SD4 is half of the maximum effective aperture of the image side surface S of the second lens L, and CT23 is the distance between the image side surface S4 of the second lens L2 and the object side surface 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. 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 surface S4 of the second lens L2 perpendicular to the optical axis O can be reduced, thereby minimizing the volume of the optical lens 100; and 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 the relationship: 4.5≤SD7 / SAG7≤6.8; wherein SD7 is half of the maximum effective aperture of the object side surface S7 of the fourth lens L4, and SAG7 is the distance from the maximum effective half aperture of the object side surface S7 of the fourth lens L4 to the intersection of the object side surface S1 of the first lens L1 and the optical axis O in the direction of the optical axis O. Specifically, SD7 / SAG7 may 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 surface S7 of the fourth lens L4 to the sagittal height of the object side surface S7, the maximum effective half aperture of the object side surface S7 of the fourth lens L4 can be effectively controlled, and by controlling the sagittal height of the object side surface S7 of the fourth lens L4, the overall volume of the fourth lens L4 can be compressed to a greater extent, thereby reducing the risk of ghost images. When the optical lens 100 exceeds the upper limit of the above relationship, it is not conducive to reducing the maximum effective semi-aperture of the object-side surface S7 of the fourth lens L4, affecting the smooth incidence of light on the fifth lens L5, and increasing the risk of ghost images; when the optical lens 100 is lower than the lower limit of the above relationship, the sagittal height of the object-side surface S7 of the fourth lens L4 is too large, and the surface shape of the fourth lens L4 is too curved, which is not conducive to the processing design of the fourth lens L4.

[0051] In some embodiments, the optical lens 100 satisfies the 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 in the direction of the optical axis O when the maximum effective semi-aperture is. 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, helps to reduce the difficulty of assembly, and can effectively correct 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 cause the length of the optical lens 100 at the near optical axis O to be too large, which is not conducive to the design of small size.

[0052] In some embodiments, the optical lens 100 satisfies the 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 in the direction of the optical axis O at the maximum effective semi-aperture. 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, the surface shape of the fourth lens L4 is optimized by reasonably controlling the thickness ratio of the fourth lens L4, which is beneficial to the effective convergence of 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, thereby ensuring good imaging performance.

[0053] In some embodiments, the optical lens 100 satisfies the 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 in the direction of the optical axis O when the maximum effective semi-aperture is located. Specifically, CT7 / ET7 may 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 to the edge thickness, not only can the higher-order aberrations generated by the optical lens 100 be effectively balanced, but also the field curvature of the seventh lens L7 can be adjusted, thereby improving the imaging quality of the optical lens 100.

[0054] In some embodiments, the optical lens 100 satisfies the relationship: 55° / mm≤FOV / IMGH≤60° / mm; wherein FOV is the maximum field of view 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 and the half image height of the optical lens 100 can be reasonably configured, which is conducive to expanding the field of view of the optical lens 100 and realizing the wide-angle characteristic, so that the optical lens 100 can capture a wider picture, and it is also conducive to increasing the imaging surface size of the optical lens 100, so that the optical lens 100 can match a larger size of the photosensitive chip, thereby facilitating the improvement of the pixel of the optical lens 100. In addition, the field of view of the optical lens 100 will not be too large, which is conducive to the correction of the distortion aberration of the optical lens 100. If the value exceeds the upper limit of the above conditional expression, the field of view of the optical lens 100 is too large, which makes it difficult to correct the distortion aberration of the optical lens 100, thereby causing the optical lens 100 to have unclear imaging and severe image deformation. If the value is lower than the lower limit of the above conditional expression, the field of view of the optical lens 100 is too small to meet the needs of wide-range shooting.

[0055] In some embodiments, the optical lens 100 satisfies the relationship: 93° / mm≤FOV / F≤101° / mm; wherein FOV is the maximum field of view of the optical lens 100, and F is the 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 of the optical lens 100 is large, thereby effectively increasing the viewing area of ​​the picture, while also having a certain macro capability, improving the optical lens 100's ability to capture low-frequency details, and meeting the design requirements of high image quality.

[0056] In some embodiments, the optical lens 100 satisfies the 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 surface S1 of the first lens L1 to the imaging surface IMG of the optical lens 100 on the optical axis O. Specifically, CTAL / TTL may 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 while meeting high pixel and high imaging quality, and the overall length of the optical lens 100 can be compressed, making the overall structure of the optical lens 100 more compact, thereby realizing a miniaturized and lightweight design of the optical lens 100.

[0057] In some embodiments, the optical lens 100 satisfies the 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 thickness of the fifth lens L5 and the sixth lens L6 on the optical axis O can be limited, which can ensure the uniform distribution of the thickness of the fifth lens L5 and the sixth lens L6 on the optical axis O, prevent the uneven spatial distribution caused by excessive thickness difference, thereby reducing the difficulty of structural arrangement and improving the yield rate of finished products.

[0058] In some embodiments, the optical lens 100 satisfies the 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, it is beneficial to correct aberrations and improve the imaging quality of the optical lens 100.

[0059] In some embodiments, the optical lens 100 satisfies the relationship: -4≤F2 / F≤-2.5; wherein 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 deflection angle of the light in the second lens L2, and at the same time, the negative refractive power provided by the second lens L2 can effectively balance the spherical aberration of the optical lens 100, effectively correct the aberration, thereby achieving good imaging quality, and at the same time, it is beneficial to reasonably configure the central thickness of the second lens L2, thereby shortening the total length of the optical lens 100, and also beneficial to expand the field of view of the optical lens 100.

[0060] In some embodiments, the optical lens 100 satisfies the relationship: -6≤F3 / F≤-3; wherein 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, which have strong refractive power, this often causes the edge field light to easily produce a large field curvature when it enters the imaging surface IMG. Therefore, a reasonable setting of the effective focal length of the third lens L3 can effectively collect and compress the incident light in the front, so that the light can smoothly transition to the rear optical lens 100, reduce the generation of aberrations, and thus improve the imaging quality of the optical lens 100.

[0061] In some embodiments, the optical lens 100 satisfies the relationship: 2.5≤F5 / F≤4.6; wherein 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. When the optical lens 100 satisfies the above relationship, the angle of incidence of the light after being refracted by the lens group can be reduced, thereby reducing the angle of incidence of the light entering the photosensitive chip on the image side of the optical lens 100, thereby improving the photosensitivity of the photosensitive chip.

[0062] In some embodiments, the optical lens 100 satisfies the relationship: 1.9≤F6 / F≤3.3; wherein 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 defining the relationship between the focal length of the sixth lens L6 and the effective focal length of the optical lens 100 as above, it is helpful to correct the aberration of the optical lens 100, and at the same time, the temperature sensitivity of the optical lens 100 can be reduced, thereby improving the imaging quality of the optical lens 100.

[0063] In some embodiments, the optical lens 100 satisfies the relationship: -2.2≤F7 / F≤-1.2; wherein 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 may 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 of the object side surface S13 and the image side surface S14 of the seventh lens L7 and the incident light will not become too large, and it is easy to further suppress the occurrence of high-order aberrations.

[0064] In some embodiments, the optical lens 100 satisfies the relationship: 3≤F8 / F≤4; wherein 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 may be 3, 3.2, 3.4, 3.6, 3.8 or 4, etc. By constraining the ratio of the focal length of the eighth lens L8 to the focal length of the optical lens 100, it is helpful to correct the aberrations that are difficult to correct by the sixth lens L6 and the seventh lens L7, 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 the relationship: 2≤R1 / R2≤2.7; wherein R1 is the radius of curvature of the object side surface S1 of the first lens L1 at the optical axis O, and R2 is the radius of curvature of the image side surface 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, it can be helpful to control the shape and curvature of the first lens L1, so as to effectively reduce the aberration introduced value of the incident light, 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 and molding of the first lens L1 and improve the processing technology of the optical lens 100.

[0066] In some embodiments, the optical lens 100 satisfies the relationship: 0.25≤CT2 / ET2≤0.5; wherein 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 when the maximum effective semi-aperture is in the direction of the optical axis O. 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, it is beneficial to balance the aberrations generated by the lens itself and improve the imaging quality of the optical lens 100.

[0067] In some embodiments, the optical lens 100 satisfies the 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 in the direction of the optical axis O when the maximum effective semi-aperture is located. Specifically, CT5 / ET5 may 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 of the thickness of the fifth lens L5 on the optical axis O to the edge thickness, not only the higher-order aberrations generated by the optical lens 100 can be effectively balanced, but also the field curvature of the fifth lens L5 can be adjusted, thereby improving the imaging quality of the optical lens 100.

[0068] In some embodiments, the optical lens 100 satisfies the 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 in the direction of the optical axis O when the maximum effective semi-aperture is located. Specifically, CT6 / ET6 may 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 of the thickness of the sixth lens L6 on the optical axis O to the edge thickness, it is beneficial to balance the aberrations generated by the lens itself and improve the imaging quality of the optical lens 100.

[0069] In some embodiments, the optical lens 100 satisfies the 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 in the direction of the optical axis O when the maximum effective semi-aperture is. 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, which is conducive to ensuring the material uniformity of the eighth lens L8, thereby improving the uniformity of the imaging quality of the optical lens 100, and at the same time, the processability of the eighth lens L8 can be ensured, and the molding difficulty of the eighth lens L8 can be reduced.

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

[0071]

[0072] Among them, Z is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, r is the distance from any point on the aspherical surface to the optical axis, c is the curvature of the aspherical vertex, c = 1 / Y, Y is the radius of curvature (that is, the paraxial curvature c is the reciprocal of the Y radius in Table 1), k is the cone constant, and Ai is the coefficient corresponding to the i-th high-order term in the aspherical surface shape formula.

[0073] The optical lens 100 of this embodiment will be described in detail below with reference to specific parameters.

[0074] First embodiment

[0075] The structural schematic diagram of the optical lens 100 disclosed in the first embodiment of the present application is as follows Figure 1 As shown, the optical lens 100 includes 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, an aperture STO, a fifth lens L5 with positive refractive power, a sixth lens L6 with positive refractive power, a seventh lens L7 with negative refractive power, an eighth lens L8 with positive refractive power, 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.

[0076] Further, the object-side surface S1 of the first lens L1 is a convex surface at the near optical axis O, and the image-side surface S2 of the first lens L1 is a concave surface at the near optical axis O. The object-side surface S3 of the second lens L2 is a convex surface at the near optical axis O, and the image-side surface S4 of the second lens L2 is a concave surface at the near optical axis O. The object-side surface S5 of the third lens L3 is a concave surface at the near optical axis O, and the image-side surface S6 of the third lens L3 is a concave surface at the near optical axis O. The object-side surface S7 of the fourth lens L4 is a convex surface at the near optical axis O, and the image-side surface S8 of the fourth lens L4 is a concave surface at the near optical axis O. The object-side surface S9 of the fifth lens L5 is a convex surface at the near optical axis O, and the image-side surface S10 of the fifth lens L5 is a convex surface at the near optical axis O. The object-side surface S11 of the sixth lens L6 is a convex surface at the near optical axis O, and the image-side surface S12 of the sixth lens L6 is a convex surface at the near optical axis O. The object-side surface S13 of the seventh lens L7 is concave at the near optical axis O, and the image-side surface S14 of the seventh lens L7 is concave at the near optical axis O. The object-side surface S15 of the eighth lens L8 is convex at the near optical axis O, and the image-side surface S16 of the eighth lens L8 is convex at the near optical axis O.

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

[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 cone constant k, and the high-order coefficients A4, A6, A8, A10, A12, A14 and A16 that can be used for each aspherical mirror surface in the first embodiment.

[0079] Table 1a

[0080]

[0081]

[0082] Table 1b

[0083]

[0084] See also Figure 2 In (A), Figure 2 (A) in the figure shows the longitudinal spherical aberration diagram of the optical lens 100 in the first embodiment at wavelengths of 940nm, 656nm, 588nm, 546nm, 486nm, 436nm and 415nm. The horizontal axis along the X-axis direction represents the focus shift in mm, and the vertical axis along the Y-axis direction represents the normalized field of view. Figure 2 It can be seen from (A) that the spherical aberration value of the optical lens 100 in the first embodiment is better, which means that the imaging quality of the optical lens 100 in this embodiment is better.

[0085] See also Figure 2 In (B), 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 direction represents the focus offset in mm, and the vertical axis along the Y-axis direction represents the field angle in degrees. T in the astigmatism diagram 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 It can be seen from (B) in FIG. 1 that at this wavelength, the astigmatism of the optical lens 100 is well compensated.

[0086] See also Figure 2 (C) in Figure 2 (C) in FIG. 1 shows a distortion curve of the optical lens 100 in the first embodiment at a wavelength of 546 nm. The horizontal axis along the X-axis direction represents the distortion, and the vertical axis along the Y-axis direction represents the field of view angle, in degrees. Figure 2 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 schematic diagram of the optical lens 100 disclosed in the second embodiment of the present application is as follows Figure 3 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 from the object side to the image side along the optical axis O.

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

[0090] The other parameters in the second embodiment are given in the following Table 2a, and the definition of each parameter can be obtained from the description of the above embodiment, which will not be repeated here.

[0091] Table 2a

[0092]

[0093]

[0094] Table 2b

[0095]

[0096] See also Figure 4 ,Depend on Figure 4It can be seen from the longitudinal spherical aberration diagram (A), astigmatism diagram (B) and distortion curve diagram (C) in the second embodiment that the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. Figure 4 (A) Figure 4 Middle (B) and Figure 4 The wavelengths corresponding to the curves in (C) can be referred to in the first embodiment. Figure 2 In (A), Figure 2 In (B), Figure 2 The contents described in (C) will not be repeated here.

[0097] Third embodiment

[0098] The structural schematic diagram of the optical lens 100 disclosed in the third embodiment of the present application is as follows: Figure 5 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 from the object side to the image side along the optical axis O.

[0099] Furthermore, in the third embodiment, the refractive power and the surface shape of each lens are consistent with the refractive power and the surface shape of each lens in the first embodiment.

[0100] Other parameters in the third embodiment are given in the following Table 3a, and the definition of each parameter can be obtained from the description of the above embodiments, which will not be repeated here.

[0101] Table 3a Table 3b

[0102]

[0103] See also Figure 6 ,Depend on Figure 6 It can be seen from the longitudinal spherical aberration diagram (A), astigmatism diagram (B) and distortion curve diagram (C) in the third embodiment that the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. Figure 6 (A) Figure 6 Middle (B) and Figure 6 The wavelengths corresponding to the curves in (C) can be referred to in the first embodiment. Figure 2 In (A), Figure 2 In (B), Figure 2 The contents described in (C) will not be repeated here.

[0104] Fourth embodiment

[0105] The structural schematic diagram of the optical lens 100 disclosed in the fourth embodiment of the present application is as follows: Figure 7 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 from the object side to the image side along the optical axis O.

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

[0107] The other parameters in the fourth embodiment are given in the following Table 4a, and the definition of each parameter can be obtained from the description of the above embodiments, which will not be repeated here.

[0108] Table 4a Table 4b

[0109]

[0110] See also Figure 8 ,Depend on Figure 8 It can be seen from the longitudinal spherical aberration diagram (A), astigmatism diagram (B) and distortion curve diagram (C) in the fourth embodiment that the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 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 8 The wavelengths corresponding to the curves in (C) can be referred to in the first embodiment. Figure 2 In (A), Figure 2 In (B), Figure 2 The contents described in (C) will not be repeated here.

[0111] Fifth embodiment

[0112] The structural schematic diagram of the optical lens 100 disclosed in the fifth embodiment of the present application is as follows Fig. 9 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 from the object side to the image side along the optical axis O.

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

[0114] The other parameters in the fifth embodiment are given in the following Table 5a, and the definition of each parameter can be obtained from the description of the above embodiments, which will not be repeated here.

[0115] Table 5a

[0116]

[0117] Table 5b

[0118]

[0119]

[0120] See also Fig.10 ,Depend on Fig.10 It can be seen from the longitudinal spherical aberration diagram (A), astigmatism diagram (B) and distortion curve diagram (C) in the fifth embodiment that the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. Fig.10 (A) Fig.10 Middle (B) and Fig.10 The wavelengths corresponding to the curves in (C) can be referred to in the first embodiment. Figure 2 In (A), Figure 2 In (B), Figure 2 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 Fig.11 The embodiment of the present application also discloses a camera module 200, which includes a photosensitive chip 201 and the above-mentioned optical lens 100, and 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 to the photosensitive chip 201, and 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 make the optical lens 100 have the characteristics of a large field of view, thereby improving the imaging quality of the optical lens 100.

[0126] See also Fig.12 The embodiment of the present application further discloses a terminal device 300, which includes a housing 301 and the camera module 200, and the camera module 200 is arranged in the housing 301. The terminal device 300 may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, a smart watch, a monitor, a car, a vehicle-mounted device, a drone, a monitoring device, etc. It can be understood that the electronic device 300 having the camera module 200 also has all the technical effects of the optical lens 100, that is, the optical lens 100 can have the characteristics of a large field of view, thereby improving the imaging quality of the optical lens 100.

[0127] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the preferred embodiments, a person of ordinary skill in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application.

Claims

1. An optical lens, characterized in that: There are eight lenses with refractive power, including: The first lens has negative refractive power, the object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis; The second lens has negative refractive power, the object side surface is convex at the near optical axis, and the image side surface is concave at the near 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 has positive refractive power, the object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis; The fifth lens has positive refractive power, and both the object side and the image side are convex near the optical axis; The sixth lens has positive refractive power, and both the object side and the image side are convex near the optical axis; The seventh lens has negative refractive power, and both the object side and the image side are concave near the optical axis; The eighth lens has positive refractive power, and both the object side and the image side are convex near the optical axis; The optical lens satisfies the following relationship: 190°≤FOV≤200°;1.85≤FNO≤2.1; Among them, FOV is the maximum field of view of the optical lens, and FNO is the aperture number of the optical lens.

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 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; Among them, 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 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 of the fifth lens, SD16 is half of the maximum effective aperture of the image side of the eighth lens, SD4 is half of the maximum effective aperture of the image side of the second lens, CT23 is the distance between the image side of the second lens and the object side of the third lens on the optical axis, SD7 is half of the maximum effective aperture of the object side of the fourth lens, and SAG7 is the distance from the maximum effective half aperture of the object side of the fourth lens to the intersection of the object side 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; and / or, 0.3≤CT7 / ET7≤0.75; Among them, CT3 is the thickness of the third lens on the optical axis, ET3 is the thickness of the third lens in the direction of the optical axis with the maximum effective semi-diameter, CT4 is the thickness of the fourth lens on the optical axis, ET4 is the thickness of the fourth lens in the direction of the optical axis with the maximum effective semi-diameter, CT7 is the thickness of the seventh lens on the optical axis, and ET7 is the thickness of the seventh lens in the direction of the optical axis with the maximum effective semi-diameter.

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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