Optical lens, camera module and terminal device

Abstract

An optical lens, a camera module and a terminal device, in common, eight pieces of lenses with refractive power, in turn include: a first lens, having negative refractive power, the object side surface is convex at the near optical axis, the image side surface is concave at the near optical axis; a second lens, having negative refractive power, the object side surface is concave at the near optical axis; a third lens, having positive refractive power, the object side surface and the image side surface are both convex at the near optical axis; a fourth lens, having positive refractive power, the object side surface of the fourth lens is convex at the near optical axis; a fifth lens, having refractive power; a sixth lens, having refractive power, the object side surface of the sixth lens is convex at the near optical axis; a seventh lens, having refractive power, the image side surface of the seventh lens is convex at the near optical axis; an eighth lens, having refractive power, the image side surface of the eighth lens is concave at the near optical axis; the optical lens satisfies the following relationship: 105°≤FOV≤115°. The present application has the characteristics of 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] With the rapid development of the automobile auxiliary driving system in recent years, optical lenses have been widely applied to automobiles. Among them, optical lenses can be widely applied to vehicle reversing visual systems, vehicle recorders, automatic parking and panoramic parking systems, road navigation systems, etc. Vehicle-mounted lenses are key components for automatic driving auxiliary systems to obtain external information. With the rapid development of automatic driving auxiliary systems, the performance requirements of front-view optical lenses are also becoming higher and higher, and are developing towards high resolution, large field of view and small distortion. The field of view angle of the optical lens in the prior art is not large enough, and the imaging quality is low, which can easily lead to problems such as too small a photographing monitoring range, many photographing dead angles, etc., and cannot meet the requirements of intelligent vehicle-mounted, monitoring systems and other fields for optical lenses to have a large field of view angle and high imaging quality. 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 large field of view angle while having high imaging quality.

[0004] In order to achieve the above-mentioned purpose, in a first aspect, the present application discloses an optical lens, which has a total of 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 of the first lens is convex near the optical axis, and the image side surface of the first lens is concave near the optical axis; a second lens with negative refractive power, the object side surface of the second lens is concave near the optical axis; a third lens with positive refractive power, the object side surface and the image side surface of the third lens are both convex near the optical axis; a fourth lens with positive refractive power, the object side surface of the fourth lens is convex near the optical axis; a fifth lens with refractive power; a sixth lens with refractive power, the object side surface of the sixth lens is convex near the optical axis; a seventh lens with refractive power, the image side surface of the seventh lens is convex near the optical axis; and an eighth lens with refractive power, the image side surface of the eighth lens is concave near the optical axis; the optical lens satisfies the following relationship: 105°≤FOV≤115°; wherein FOV is the maximum field of view angle of the optical lens.

[0005] In the optical lens provided in this application, the first lens has negative refractive power, a convex object-side surface, and a concave image-side surface. The meniscus shape with the convex surface facing the object side effectively collects incident light rays with a large field of view. The second lens has negative refractive power and a concave object-side surface, which can initially correct the astigmatism of the optical lens and effectively control the light path to achieve a larger aperture. The third lens has positive refractive power, and both the object-side and image-side surfaces can be convex, effectively collecting and compressing incident light rays from the object side, allowing light to smoothly transition to the image-side lens. The fourth lens has positive refractive power and a convex object-side surface, which helps to lower the incident angle of light rays after passing through the aperture, allowing more light to enter the image-side lens and improving the illumination of the optical lens. The fifth, sixth, seventh, and eighth lenses all possess refractive power. The object-side surface of the sixth lens is convex near the optical axis, the image-side surface of the seventh lens is convex near the optical axis, and the image-side surface of the eighth lens is concave near the optical axis. This effectively controls the direction of light and improves image quality. When 105° ≤ FOV ≤ 115°, the optical lens has a large field of view, allowing it to capture more scene content and enrich the imaging information.

[0006] Secondly, this application discloses a camera module, which includes a photosensitive chip and an optical lens as described in the first aspect above, wherein the photosensitive chip is disposed on the image side of the optical lens. The camera module with the optical lens enables miniaturized optical lens design while simultaneously providing the optical lens with a large field of view, thus improving the imaging quality of the optical lens.

[0007] Thirdly, this application discloses a terminal device, including a housing and a camera module as described in the second aspect above, wherein the camera module is disposed in the housing. Electronic devices having the camera module achieve miniaturized optical lens design while simultaneously enabling the optical lens to possess a large field of view, thereby improving the imaging quality of the optical lens. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of the optical lens disclosed in the first embodiment of this application.

[0009] Figure 2 These are the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical lens disclosed in the first embodiment of this application.

[0010] Figure 3 This is a schematic diagram of the structure of the optical lens disclosed in the second embodiment of this application.

[0011] Figure 4 These are the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical lens disclosed in the second embodiment of this application.

[0012] Figure 5 This is a schematic diagram of the structure of the optical lens disclosed in the third embodiment of this application.

[0013] Figure 6 These are the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical lens disclosed in the third embodiment of this application.

[0014] Figure 7 This is a schematic diagram of the structure of the optical lens disclosed in the fourth embodiment of this application.

[0015] Figure 8 These are the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical lens disclosed in the fourth embodiment of this application.

[0016] Figure 9 This is a schematic diagram of the structure of the optical lens disclosed in the fifth embodiment of this application.

[0017] Figure 10 These are the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical lens disclosed in the fifth embodiment of this application.

[0018] Figure 11 This is a schematic diagram of the structure of the optical lens disclosed in the sixth embodiment of this application.

[0019] Figure 12 These are the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical lens disclosed in the sixth embodiment of this application.

[0020] Figure 13 This is a schematic diagram of the structure of the optical lens disclosed in the seventh embodiment of this application.

[0021] Figure 14 These are the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical lens disclosed in the seventh embodiment of this application.

[0022] Figure 15 This is a schematic diagram of the structure of the optical lens disclosed in the eighth embodiment of this application.

[0023] Figure 16 These are the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical lens disclosed in the eighth embodiment of this application.

[0024] Figure 17 This is a schematic diagram of the camera module disclosed in this application.

[0025] Figure 18 This is a schematic diagram of the terminal device disclosed in this application. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Firstly, please refer to Figure 1 This application discloses an optical lens 100, which has eight lenses with refractive power. From the object side to the image side along the optical axis O, the lenses are, in order: a first lens L1 with negative refractive power, a second lens L2 with negative refractive power, a third lens L3 with positive refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8.

[0028] Furthermore, the object-side surface S1 of the first lens L1 is convex near the optical axis O, and the image-side surface S2 of the first lens L1 is concave near the optical axis O; the object-side surface S3 of the second lens L2 is concave near the optical axis O; the object-side surface S5 of the third lens L3 is convex near the optical axis O, and the image-side surface S6 of the third lens L3 is convex near the optical axis O; the object-side surface S7 of the fourth lens L4 is convex near the optical axis O; the object-side surface S9 and the image-side surface S10 of the fifth lens L5 are both aspherical; the object-side surface S11 of the sixth lens L6 is convex near the optical axis O; the image-side surface S14 of the seventh lens L7 is convex near the optical axis O, and the sixth lens L6 and the seventh lens L7 are cemented lenses; the image-side surface S16 of the eighth lens L8 is concave near the optical axis O, and the object-side surface S15 and the image-side surface S16 of the eighth lens L8 are both aspherical.

[0029] In the optical lens 100 provided in this embodiment, the first lens L1 has negative refractive power, the object-side surface S1 is convex, and the image-side surface S2 is concave. The meniscus shape with the convex surface facing the object side can effectively collect incident light with a large field of view, achieving a maximum field of view of the optical lens 100 greater than or equal to 105°. The second lens L2 has negative refractive power, and the object-side surface S3 is concave. It can initially correct the astigmatism of the optical lens 100 and effectively control the light path, achieving a larger aperture. The third lens L3 has positive refractive power, and the object-side surface S5 is convex. The image-side surface S6 can also be convex. It can effectively collect and compress incident light on the object side, allowing light to smoothly transition to the image-side lens. The fourth lens L4 has positive refractive power, and the object-side surface S7 is convex. It helps to lower the incident angle of light after passing through the aperture, allowing more light to enter the image-side lens and improving the illumination of the optical lens 100. The fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 all have refractive power. The object-side surface S11 of the sixth lens L6 is convex near the optical axis O, and the image-side surface S14 of the seventh lens L7 is convex near the optical axis O. This can effectively control the direction of light and improve image quality.

[0030] In some embodiments, the optical lens 100 further includes an aperture stop STO, which may be an aperture stop and / or a field stop. By placing the aperture stop STO between the image-side surface S10 of the third lens L5 and the object-side surface S11 of the sixth lens L6, the exit pupil can be moved away from the imaging plane 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.

[0031] In some embodiments, the optical lens 100 further includes an infrared filter IR, which is disposed between the eighth lens L8 and the imaging surface IMG of the optical lens 100. Optionally, the infrared filter IR may be an infrared cutoff filter to filter out infrared light and allow visible light to pass through, making the image more consistent with the visual experience of the human eye, thereby improving image quality. In other embodiments, the infrared filter IR may be an infrared bandpass filter to allow infrared light to pass through and reflect visible light, thereby achieving infrared imaging of the optical lens 100, enabling the optical lens 100 to image in low-light environments or special application scenarios and obtain better image quality.

[0032] In some embodiments, the optical lens 100 satisfies the relation: 105° ≤ FOV ≤ 115°. Here, FOV is the maximum field of view angle of the optical lens 100. Specifically, FOV can be 106°, 109°, 111°, 112°, 113°, or 114.9°, etc. When the above relation is satisfied, the optical lens 100 has a relatively large field of view angle, which is conducive to the optical lens 100 obtaining more scene content, thereby enriching the imaging information of the optical lens 100.

[0033] In some embodiments, the optical lens 100 satisfies the relation: 1.2 < SD11 / IMGH < 1.6. Here, SD11 is half of the maximum effective aperture of the object side surface S1 of the first lens L1, and IMGH is the radius of the maximum effective imaging circle on the imaging surface IMG of the optical lens 100. Specifically, SD11 / IMGH can be 1.21, 1.26, 1.3, 1.35, 1.4, 1.45, 1.5, or 1.59, etc. When the optical lens 100 satisfies the above relation, since the first lens L1 mainly functions to converge light rays, the larger the aperture of the first lens L1, the better the light collection effect. However, a larger aperture will increase the overall size of the optical lens 100. Therefore, when the above relation is satisfied, it can ensure that the aperture of the first lens L1 and the image height of the optical lens 100 are within a suitable range, thereby controlling the aperture of the first lens L1 to balance the illuminance, field of view angle, and size.

[0034] In some embodiments, the optical lens 100 satisfies the relation: 39mm < TTL*IMGH / F < 43mm; where 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, and F is the effective focal length of the optical lens 100. Specifically, TTL*IMGH / F can be 39.1mm, 39.5mm, 40mm, 40.5mm, 41mm, 41.7mm, 42.1mm, or 42.9mm, etc. When this relation is satisfied, it can meet the requirement that the optical lens 100 is adapted to a large-sized imaging surface IMG, meet the market demand for miniaturization of the optical lens 100, and enable the optical lens 100 to meet the market demands for both large target surfaces and miniaturization simultaneously.

[0035] In some embodiments, the optical lens 100 satisfies the relation: 6.2 < TTL / IMGH < 7; where 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 largest effective imaging circle on the imaging surface IMG of the optical lens 100. Specifically, TTL / IMGH can be 6.21, 6.3, 6.4, 6.5, 6.6, 6.7, 6.8, or 6.99, etc. When the optical lens 100 satisfies the above relation, with the reasonable configuration of the refractive powers of each lens, the optical lens 100 can obtain good thinness and lightness, have good aberration balance and image quality improvement ability, and at the same time support high-pixel photosensitive chips. In addition, IMGH can determine the size of the photosensitive chip, and the larger IMGH is, the larger the maximum size of the supported photosensitive chip is.

[0036] In some embodiments, the optical lens 100 satisfies the relation: 4.2 < TTL / SD11 < 5.6; where 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 SD11 is half of the maximum effective aperture of the object side surface S1 of the first lens L1. Specifically, TTL / SD11 can be 4.21, 4.4, 4.6, 4.9, 5.2, 5.4, 5.5, or 5.59, etc. By reasonably configuring the ratio of 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 near optical axis O and the maximum effective semi-aperture of the object side surface S1 of the first lens L1, it helps to shorten the total length of the optical lens 100, increase the field angle of the optical lens 100, and achieve the wide-angle feature.

[0037] In some embodiments, the optical lens 100 satisfies the relation: 3 < R11 / F < 15; where R11 is the radius of curvature of the object side surface S1 of the first lens L1 at the optical axis O, and F is the effective focal length of the optical lens 100. Specifically, R,1 / F can be 3.1, 5, 7, 9, 11, 13, 14, or 14.9, etc. By controlling the ratio of the radius of curvature of the object side surface S1 of the first lens L1 at the optical axis 0 to the focal length of the optical lens 100, the refractive power of the first lens L1 can be controlled within a reasonable range, which is beneficial to balancing the refractive power borne by the first lens L1 in the optical lens 100, and further beneficial to balancing the high-order coma of the optical lens 100, so that the optical lens 100 has good imaging quality.

[0038] In some embodiments, the optical lens 100 satisfies the relational expression: 1.3 < F3 / F < 2.3; 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 1.31, 1.5, 1.7, 1.9, 2, 2.1, 2.2, or 2.29, etc. Since light rays are emitted from the first lens L1 and the second lens L2 with strong refractive power, this often causes a large field curvature when the marginal field light rays enter the imaging surface IMG. Therefore, by reasonably setting the effective focal length of the third lens L3, the incident light rays in front can be effectively collected and compressed, enabling the light rays to smoothly transition to the optical lens 100 behind, reducing the generation of aberrations, and thus improving the imaging quality of the optical lens 100.

[0039] In some embodiments, the optical lens 100 satisfies the relational expression: 1 < |F6 / F| < 1.6; 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 1.01, 1.2, 1.3, 1.35, 1.4, 1.45, 1.5, or 1.59, etc. By making the above limitation on the relationship between the focal length of the sixth lens L6 and the effective focal length of the optical lens 100, it helps to correct the aberrations of the optical lens 100, and at the same time can reduce the temperature sensitivity of the optical lens 100, and further improve the imaging quality of the optical lens 100.

[0040] In some embodiments, the optical lens 100 satisfies the relational expression: 3 < R11 / R12 < 13; where R11 is the curvature radius of the object side surface S1 of the first lens L1 at the optical axis O, and R12 is the curvature radius of the image side surface S2 of the first lens L1 at the optical axis O. Specifically, R11 / R12 can be 3.1, 4, 5, 7, 9, 10, 11, or 12.9, etc. When the optical lens 100 satisfies the above relational expression, it is beneficial to control the shape and bending degree of the first lens L1, thereby effectively reducing the aberration introduction value of the incident light rays, promoting the aberration balance of the optical lens 100. At the same time, it can also reduce the processing difficulty of the first lens L1, which is beneficial to the manufacturing and shaping of the first lens L1, and improve the processing technology of the optical lens 100.

[0041] In some embodiments, both the object side surface S9 and the image side surface S10 of the fifth lens L5 are aspherical surfaces. By setting the surface type of the fifth lens L5 as an aspherical surface, through the design of the aspherical surface, the astigmatism of the optical lens 100 can be effectively corrected, and at the same time, the trend of the light rays can be effectively controlled, which is also beneficial to improving the imaging quality.

[0042] In some embodiments, the optical lens 100 satisfies the relation: 1.9 < R52 / R51 < 30; where R52 is the radius of curvature of the image side S10 of the fifth lens L5 at the optical axis O, and R51 is the radius of curvature of the object side S9 of the fifth lens L5 at the optical axis O. Specifically, R52 / R51 can be 1.901, 5, 10, 15, 19, 23, 25, or 29.999, etc. When the optical lens 100 satisfies the above conditional formula, the surface shape of the fifth lens L5 is reasonably controlled, the contribution of the astigmatism of the fifth lens L5 can be effectively controlled, the imaging quality of the middle field of view is guaranteed, which is beneficial to correcting the aberration of the optical lens 100, ensuring the balance of the distortion amount of the optical lens 100. At the same time, it avoids the surface shape of the object side S9 and the image side S10 of the fifth lens L5 being too curved at the optical axis O, which is beneficial to reducing the processing difficulty of the fifth lens L5 and improving the yield rate of the fifth lens L5.

[0043] In some embodiments, both the object side S15 and the image side S16 of the eighth lens L8 are aspherical surfaces. By setting the surface shape of the eighth lens L8 as an aspherical surface, through the design of aspherical back curvature, the distortion of the edge field of view can be effectively corrected, realizing low distortion of the optical lens 100, and at the same time, it is beneficial to improving the imaging quality. By setting the sixth lens L6 and the seventh lens L7 as cemented lenses, it is beneficial to correcting chromatic aberration and balancing various aberrations, improving resolution, and can effectively reduce the tolerance sensitivity, thus enhancing the imaging quality of the optical lens 100.

[0044] In some embodiments, the optical lens 100 satisfies the relation: 0 < |R81 / R82| < 35; where R15 is the radius of curvature of the object side S15 of the eighth lens L8 at the optical axis O, and R16 is the radius of curvature of the image side S16 of the eighth lens L8 at the optical axis O. Specifically, |R81 / R82| can be 0.1, 5, 10, 15, 20, 25, 30, or 34.9, etc. When the above relation is satisfied, it is beneficial to reasonably configure the ratio of the radius of curvature of the object side S15 and the image side S16 of the eighth lens L8 at the optical axis O, reasonably set the difference between the two radii of curvature, adjust the refractive power within a reasonable range, and reduce the deflection angle of the full-field light rays in the optical lens 100, controlling the generation and correction of aberrations.

[0045] In some embodiments, the optical lens 100 satisfies the relational expression: 1.4 < ∑CT / ∑AT < 2.1; where ∑CT is the sum of the thicknesses of the first lens L1 to the eighth lens L8 on the optical axis O respectively, and ∑AT is the sum of the gaps of the first lens L1 to the eighth lens L8 on the optical axis O. Specifically, ∑CT / ∑AT can be 1.41, 1.5, 1.6, 1.7, 1.8, 1.9, 2 or 2.09, etc. By satisfying the above relational expression, the step difference between the lenses of the optical lens 100 can be effectively shortened by reasonably configuring the air gap, and it is beneficial to the abutment design of the lenses of the optical lens 100, improving the assembly yield of the optical lens 100. If it exceeds the upper limit of the relational expression, the lenses are too close to each other, which easily causes collisions between the lenses; if it is lower than the lower limit of the relational expression, the interval between the lenses is relatively large, which is not conducive to the assembly of the lenses.

[0046] In some embodiments, the optical lens 100 satisfies the relational expression: 1.2 < SD11 / SD82 < 1.81; where SD11 is half of the maximum effective aperture of the object side S1 of the first lens L1, and SD16 is half of the maximum effective aperture of the image side S16 of the eighth lens L8. Specifically, SD11 / SD82 can be 1.21, 1.3, 1.4, 1.5, 1.6, 1.65, 1.75 or 1.809, etc. Since the first lens L1 mainly functions to converge light rays, the larger the aperture of the first lens L1, the better the light-receiving effect. However, a larger aperture will increase the overall size of the optical lens 100. Therefore, when the above relational expression is satisfied, it can ensure that the apertures of the object side S1 of the first lens L1 and the image side S16 of the eighth lens L8 are within a suitable range, thereby controlling the aperture of the first lens L1, so that while the optical lens 100 has a large viewing angle, the viewpoint depth of the entire optical lens 100 can be effectively reduced.

[0047] In some embodiments, the optical lens 100 satisfies the relational expression: -15 < F1 / CT1 < -5; where F1 is the effective focal length of the first lens L1, and CT1 is the thickness of the first lens L1 on the optical axis O. Specifically, F1 / CT1 can be -14.9, -12, -10, -8, -7, -6, -5.2 or -5.1, etc. Since the first lens L1 is closest to the object side, setting the first lens L1 as a lens with negative refractive power can enable the incident light rays entering the optical lens 100 at a large angle to enter smoothly, and further expand the viewing angle range of the optical lens 100, ensuring the imaging quality of the optical lens 100.

[0048] In some embodiments, the sixth lens L6 and the seventh lens L7 are cemented lenses.

[0049] The optical lens 100 satisfies the relationship: 0 < F / F67 < 0.3; where F is the effective focal length of the optical lens 100, and F67 is the combined effective focal length of the sixth lens L6 and the seventh lens L7. Specifically, F / F67 can be 0.01, 0.05, 0.1, 0.15, 0.18, 0.2, 0.25, or 0.29, etc. Satisfying the above relationship and reasonably configuring the ratio relationship between the combined effective focal length of the sixth lens L6 and the seventh lens L7 and the effective focal length of the optical lens 100 is beneficial to correcting the off-axis aberration of the optical lens 100 and improving the imaging quality of the optical lens 100.

[0050] In some embodiments, the optical lens 100 satisfies the relationship: 0.12 < (CT6 + CT7) / TTL < 0.2; where CT6 is the thickness of the sixth lens L6 on the optical axis O, CT7 is the thickness of the seventh lens L7 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, (CT6 + CT7) / TTL can be 0.121, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, or 0.199, etc. By appropriately increasing the central thickness of the cemented lenses, it is beneficial to enhance their light control ability, beneficial to regulating more light to enter the rear system, and improving the relative illumination.

[0051] In some embodiments, the optical lens 100 satisfies the relationship: 0.3mm -1 <|(VD6 - VD7) / F67| < 2mm -1 ; where VD6 is the Abbe number of the material used for the sixth lens L6, VD7 is the Abbe number of the material used for the seventh lens L7, and F67 is the combined effective focal length of the sixth lens L6 and the seventh lens L7. Specifically, |(VD6 - VD7) / F67| can be 0.31, 0.5, 0.7, 0.9, 1.2, 1.4, 1.6, or 1.99, etc. By reasonably setting the ratio of the difference in Abbe numbers between the sixth lens L6 and the seventh lens L7 to the combined effective focal length of the sixth lens L6 and the seventh lens L7, the chromatic aberration of the optical lens 100 can be effectively corrected, the authenticity of colors can be restored, and the imaging quality can be improved.

[0052] In some embodiments, the optical lens 100 satisfies the relation: 1 < SD12 / SD21 < 1.2; where SD12 is half of the maximum effective aperture of the image side S2 of the first lens L1, and SD21 is half of the maximum effective aperture of the object side S3 of the second lens L2. Specifically, SD12 / SD21 can be 1.001, 1.11, 1.12, 1.13, 1.15, 1.17, 1.18, or 1.19, etc. Satisfying the above relation can reasonably configure the ratio of the maximum effective semi-aperture of the image side S2 of the first lens L1 to the object side S3 of the second lens L2, which is beneficial to reducing the step difference between the first lens L1 and the second lens L2, so that the light can smoothly transition between the first lens L1 and the second lens L2, and further is beneficial to correcting the off-axis field aberration and improving the imaging quality.

[0053] In some embodiments, the optical lens 100 satisfies the relation: 0 < CT56 / (CT5 + CT6) < 0.75; where CT56 is the distance between the image side S10 of the fifth lens L5 and the object side S11 of the sixth lens L6 on the optical axis O, 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, CT56 / (CT5 + CT6) can be 0.01, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, or 0.74, etc. Satisfying the above relation can effectively avoid too large air gap between the fifth lens L5 and the sixth lens L6 on the optical axis O. On the one hand, it is beneficial to the correction of the aberration of the optical lens 100, thereby improving the imaging quality of the optical lens 100. On the other hand, it provides space for the structural and forming rationality of the non-effective diameter of the sixth lens L6, and ensures the overall feasibility in a small-size lens barrel.

[0054] In some embodiments, the optical lens 100 satisfies the relation: 0 < CT78 / CT8 < 1.7; where CT78 is the distance between the image side S14 of the seventh lens L7 and the object side S15 of the eighth lens L8 on the optical axis O, and CT8 is the thickness of the eighth lens L8 on the optical axis O. Specifically, CT78 / CT8 can be 0.1, 0.3, 0.5, 0.7, 0.9, 1.3, 1.5, or 1.69, etc. Satisfying the above relation can effectively avoid too large air gap between the seventh lens L7 and the eighth lens L8 on the optical axis O, which is beneficial to the correction of the aberration of the optical lens 100, thereby improving the imaging quality of the optical lens 100.

[0055] In some embodiments, the optical lens 100 satisfies the relation: 64° < FOV / FNO < 71°; where FOV is the maximum field of view angle of the optical lens 100, and FNO is the f-number of the optical lens 100. Specifically, FOV / FNO can be 64.1°, 65°, 66°, 67°, 68°, 69°, 70° or 70.9°, etc. When the optical lens 100 satisfies the above relation, the field of view angle and the light passing amount of the optical lens 100 can be reasonably controlled, the distortion of the edge field of view can be improved, and the excessive light flux of the optical lens 100 can be prevented.

[0056] In some embodiments, the optical lens 100 satisfies the relation: 5.9 < TTL / F < 6.3; where 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 F is the effective focal length of the optical lens 100. Specifically, TTL / F can be 5.91, 5.93, 5.97, 5.99, 6, 6.1, 6.2 or 6.29, etc. By satisfying the above relation, by reasonably configuring the total optical length of the optical lens 100 and the focal length of the optical lens 100, while satisfying the field of view angle range of the optical lens 100, the total optical length of the optical lens 100 can be reasonably controlled, and the miniaturization characteristics of the optical lens 100 can also be satisfied.

[0057] In some embodiments, the optical lens 100 satisfies the relation: 1 < F / IMGH < 1.15; where F is the effective focal length of the optical lens 100, and IMGH is the radius of the largest effective imaging circle on the imaging surface IMG of the optical lens 100. Specifically, F / IMGH can be 1.01, 1.03, 1.05, 1.07, 1.09, 1.11, 1.13 or 1.14, etc. When the optical lens 100 satisfies the above relation, the distortion generated by the optical lens 100 can be effectively corrected, thereby improving the imaging quality of the optical lens 100 while reducing the manufacturing difficulty of the optical lens 100; in addition, it can help to control the focal length of the optical lens 100 within a reasonable range, and ensure that the optical lens 100 has a sufficient light receiving area and a sufficient field of view angle, so as to simultaneously satisfy the characteristics of a large field of view angle and a large image surface.

[0058] In some embodiments, the optical lens 100 satisfies the relation: 1.6 < FNO < 1.65; where FNO is the f-number of the optical lens 100. Specifically, FNO can be 1.605, 1.608, 1.61, 1.615, 1.621, 1.625, 1.63, 1.649, etc. When the optical lens 100 satisfies the above relation, it has the characteristic of a large aperture. The optical lens 100 has sufficient light input, which can make the images captured by the optical lens 100 clearer, so that it can be applicable to object space scenes with low light brightness such as shooting high-quality night scenes and starry skies. In addition, it can also avoid introducing excessive aberrations, making the optical lens 100 achieve an overall balance.

[0059] In some embodiments, the optical lens 100 satisfies the relation: -2 < F1 / F < -1.5; where 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 -1.99, -1.9, -1.85, -1.8, -1.75, -1.7, -1.6, -1.51, etc. When the optical lens 100 satisfies the above relation, 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 is not too strong, avoiding introducing too much spherical aberration, and making the optical lens 100 have good imaging quality.

[0060] In some embodiments, the optical lens 100 satisfies the relation: -10 < F2 / F < -0.5; 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 -9.9, -8, 1.3, 1.35, 1.4, 1.45, 1.5, -0.51, etc. When the optical lens 100 satisfies the above relation, it is beneficial to reduce the deflection angle of light in the second lens L2. 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 correcting aberrations, thereby achieving 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. In addition, it is also beneficial to expand the field angle of the optical lens 100.

[0061] In some embodiments, the optical lens 100 satisfies the relationship: 1 < F4 / F < 2.5; where F4 is the effective focal length of the fourth lens, and F is the effective focal length of the optical lens. Specifically, F4 / F can be 1.1, 1.3, 1.5, 1.7, 1.9, 2.1, 2.3, or 2.49, etc. When the optical lens 100 satisfies the above relationship, the fourth lens L4 provides a 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. The fourth lens L4 and 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, and avoid high-order aberrations caused by excessive refractive index, thereby improving the imaging quality of the optical lens 100.

[0062] In some embodiments, the optical lens 100 satisfies the relationship: 1 < F5 / F < 5; 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 1.1, 1.5, 2, 2.5, 3, 3.5, 4, or 4.9, etc. When the optical lens 100 satisfies the above relationship, the exit angle of the light after being refracted by the lens group can be reduced, so that the incident angle of the light entering the photosensitive chip on the image side of the optical lens 100 can be reduced, and further the photosensitive performance of the photosensitive chip can be improved.

[0063] In some embodiments, the optical lens 100 satisfies the relationship: 2.7 < F7 / F < 3.3; where F7 is the effective focal length of the seventh lens, and F is the effective focal length of the optical lens 100. Specifically, F7 / F can be 2.71, 2.8, 2.9, 3, 3.05, 3.15, 3.25, or 3.29, 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 angles between the normal lines 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: 1 < |F8 / F| < 1.6; where F8 is the effective focal length of the eighth lens, and F is the effective focal length of the optical lens 100. Specifically, |F8 / F| can be 1.01, 1.1, 1.2, 1.3, 1.35, 1.4, 1.5, or 1.59, etc. By restricting the ratio of the focal length of the eighth lens L8 to the focal length of the optical lens 100, it is beneficial 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 relational expression: 1.4 < |R22 / R21| < 5.1; where R21 is the radius of curvature of the object side surface S3 of the second lens L2 at the optical axis O, and R22 is the radius of curvature of the image side surface S4 of the second lens L2 at the optical axis O. Specifically, |R4 / R3| can be 1.41, 2, 2.5, 3, 3.5, 4, 4.5, or 5.09, etc. When the optical lens 100 satisfies the above relational expression, by adjusting the radius of curvature of the second lens L2, the spherical aberration and astigmatism of the optical lens 100 can be effectively corrected, while the sensitivity of the second lens L2 can be reduced, and the influence of the field curvature during the focusing process at different object distances of the optical lens 100 can be reduced, improving the imaging quality.

[0066] In some embodiments, the optical lens 100 satisfies the relational expression: -2.1 < R31 / R32 < -0.9; where R31 is the radius of curvature of the object side surface S5 of the third lens L3 at the optical axis O, and R32 is the radius of curvature of the image side surface S6 of the third lens L3 at the optical axis 0. Specifically, R31 / R32 can be -2.099, -2, -1.8, -1.6, -1.4, -1.2, -1.01, or -0.91, etc. When the optical lens 100 satisfies the above relational expression, in combination with the concave-convex surface type of the third lens L3, the radius of curvature and surface type 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, so that the on-axis spherical aberration of the entire optical lens 100 is reduced, 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 facilitating the reduction of the generation of optical distortion.

[0067] In some embodiments, the optical lens 100 satisfies the relational expression: 0.3 < |R41 / R42| < 2.3; where R41 is the radius of curvature of the object side surface S7 of the fourth lens L4 at the optical axis O, and R42 is the radius of curvature of the image side surface S8 of the fourth lens L4 at the optical axis O. Specifically, |R41 / R42| can be 0.31, 0.6, 0.9, 1.3, 1.6, 1.9, 2.2, or 2.29, etc. When the optical lens 100 satisfies the above relational expression, it is beneficial to correct the aberration generated by the optical lens 100, making the refractive power configuration of each lens of the optical lens 100 uniform in the direction perpendicular to the optical axis O, greatly correcting the distortion and aberration generated by the front lens, and at the same time avoiding excessive bending of the fourth lens L4, which is easy to form and manufacture.

[0068] In some embodiments, the optical lens 100 satisfies the relationship: 2.5 < R61 / R62 < 7; where, R61 is the curvature radius of the object side surface S11 of the sixth lens L6 at the optical axis O, and R62 is the curvature radius of the image side surface S12 of the sixth lens L6 at the optical axis O. Specifically, R61 / R62 can be 2.51, 3, 3.5, 4, 4.5, 5, 6, 6.9, etc. When the optical lens 100 satisfies the above relationship, the curvature radius of the object side surface S11 of the sixth lens L6 at the optical axis O and the curvature radius 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 while correcting the astigmatism of the optical lens 100, it can also reduce the sensitivity of the performance change of the optical lens 100, which is beneficial to improving the product yield.

[0069] In some embodiments, the optical lens 100 satisfies the relationship: 0.2 < R71 / R72 < 0.5; where, R71 is the curvature radius of the object side surface S13 of the seventh lens L7 at the optical axis O, and R72 is the curvature radius of the image side surface of the seventh lens L7 at the optical axis O. Specifically, R71 / R72 can be 0.21, 0.25, 0.27, 0.3, 0.35, 0.4, 0.45, 0.49, etc. By restricting the ratio of the curvature radius of the object side surface S13 of the seventh lens L7 to the curvature radius of the image side surface S14 of the seventh lens L7, the difference between the curvature radius of the object side surface S13 of the seventh lens L7 and the curvature radius of the image side surface S14 of the seventh lens L7 becomes more reasonable. When the seventh lens L7 satisfies the above relationship, the curvature radius of the object side surface S13 of the seventh lens L7 is less than the curvature radius of the image side surface S14 of the seventh lens L7, and the object side surface S13 of the seventh lens L7 is more curved relative to the image side surface S14 of the seventh lens L7, so as to keep the incident light ray at a smaller deflection angle, which is beneficial to correcting the astigmatism generated by the front lens group (i.e., the first lens L1 to the sixth lens L6) and improving the imaging quality of the optical lens 100.

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

[0071]

[0072] where, Z is the distance from the corresponding point on the aspherical surface to the plane tangent to the surface vertex, 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 curvature radius (i.e., the paraxial curvature c is the reciprocal 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 aspherical surface profile formula.

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

[0074] First Embodiment

[0075] The structural schematic diagram of the optical lens 100 disclosed in the first embodiment of this application is shown below. 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 positive refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with positive refractive power, an aperture STO, a sixth lens L6 with positive refractive power, a seventh lens L7 with negative refractive power, an eighth lens L8 with negative refractive power, a filter IR, and a protective glass CG, arranged sequentially from the object side to the image side along the optical axis O.

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

[0077] Specifically, along the optical axis O of the optical lens 100, the elements from the object side to the image side are arranged sequentially according to the order of the elements in Table 1a from top to bottom. In the same lens, the surface with the smaller surface number is the object side of the lens, and the surface with the larger surface number is the image side of the lens. For example, surface numbers 1 and 2 correspond to the object side S1 and image side S2 of the first lens L1, respectively. The Y-radius in Table 1a is the radius of curvature of the object side or image side 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 of the lens to the next surface on the optical axis O. The value of the stop STO in the "Thickness" parameter column represents the distance from the stop 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 this value is negative, it indicates that the stop STO is set 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 Y radius, thickness, and effective focal length in Table 1a are all mm. And the reference wavelength for the refractive index and Abbe number of each lens in Table 1a is 587.56 nm, and the reference wavelength for 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, and the object-side surface S15 and the image-side surface S16 of the eighth lens L8 are both aspherical. Table 1b gives the conic constant k and higher-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] Please see Figure 2 (A) in the middle Figure 2 Figure (A) shows longitudinal spherical aberration diagrams of the optical lens 100 in the first embodiment at wavelengths of 656 nm, 588 nm, 546 nm, 486 nm, 436 nm, and 410 nm. The horizontal axis along the X-axis represents the focus shift in mm, and the vertical axis along the Y-axis represents the normalized field of view. Figure 2 As can be seen from (A) in the first embodiment, the spherical aberration value of the optical lens 100 is better, indicating that the imaging quality of the optical lens 100 in this embodiment is better.

[0085] Please see Figure 2 (B) in the middle Figure 2 Figure (B) shows an 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 shift in mm, and the vertical axis along the Y-axis represents the field of view in degrees. In the astigmatism diagram, T represents the curvature of the imaging plane IMG in the sub-arc direction, and S represents the curvature of the imaging plane IMG in the sagittal direction. Figure 2 As can be seen from (B) in the figure, the astigmatism of the optical lens 100 is well compensated at this wavelength.

[0086] Please see Figure 2 (C) in the middle, Figure 2 Figure (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 distortion, and the vertical axis along the Y-axis represents the field of view, in degrees (deg). Figure 2 As can be seen from (C), the distortion of the optical lens 100 is well corrected at this wavelength.

[0087] Second Embodiment

[0088] The structural schematic diagram of the optical lens 100 disclosed in the second embodiment of this application is shown below. 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, a fifth lens L5, an aperture stop STO, a sixth lens L6, a seventh lens L7, an eighth lens L8, a filter IR, and a protective glass CG arranged sequentially along the optical axis O from the object side to the image side.

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

[0090] Other parameters in the second embodiment are given in Table 2a below, and the definitions of each parameter can be derived from the description of the foregoing embodiments, and will not be repeated here.

[0091] Table 2a

[0092]

[0093] Table 2b

[0094]

[0095] Please see Figure 4 ,Depend on Figure 4As can be seen from (A) the longitudinal spherical aberration diagram, (B) the astigmatism diagram, and (C) the distortion curve diagram, in the second embodiment, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are all well controlled, thus the optical lens 100 of this embodiment has good imaging quality. Furthermore, regarding... Figure 4 (A) Figure 4 (B) and Figure 4 The wavelengths corresponding to each curve in (C) can be referred to in the first embodiment regarding... Figure 2 (A) in the middle Figure 2 (B) in the middle Figure 2 The content described in (C) will not be repeated here.

[0096] Third Embodiment

[0097] The structural schematic diagram of the optical lens 100 disclosed in the third embodiment of this application is shown below. Figure 5 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 positive refractive power, an aperture STO, a fourth lens L4 with positive refractive power, a fifth lens L5 with negative refractive power, a sixth lens L6 with negative refractive power, a seventh lens L7 with positive refractive power, an eighth lens L8 with negative refractive power, a filter IR, and a protective glass CG, arranged sequentially from the object side to the image side along the optical axis O.

[0098] Furthermore, the object-side surface S1 of the first lens L1 is convex near the optical axis O, and the image-side surface S2 of the first lens L1 is concave near the optical axis O; the object-side surface S3 of the second lens L2 is concave near the optical axis O, and the image-side surface S4 of the second lens L2 is convex near the optical axis O; the object-side surface S5 of the third lens L3 is convex near the optical axis O, and the image-side surface S6 of the third lens L3 is convex near the optical axis O; the object-side surface S7 of the fourth lens L4 is convex near the optical axis O, and the image-side surface S8 of the fourth lens L4 is convex near the optical axis O; The object-side surface S9 of the fifth lens L5 is concave near the optical axis O, and the image-side surface S10 of the fifth lens L5 is convex near the optical axis O; the object-side surface S11 of the sixth lens L6 is convex near the optical axis O, and the image-side surface S12 of the sixth lens L6 is concave near the optical axis O; the object-side surface S13 of the seventh lens L7 is convex near the optical axis O, and the image-side surface S14 of the seventh lens L7 is convex near the optical axis O; the object-side surface S15 of the eighth lens L8 is concave near the optical axis O, and the image-side surface S16 of the eighth lens L8 is concave near the optical axis O.

[0099] The other parameters in the third embodiment are given in Table 3a below, and the definitions of each parameter can be derived from the description of the foregoing embodiments, and will not be repeated here.

[0100] Table 3a

[0101]

[0102]

[0103] Table 3b

[0104]

[0105] Please see Figure 6 ,Depend on Figure 6 As can be seen from (A) the longitudinal spherical aberration diagram, (B) the astigmatism diagram, and (C) the distortion curve diagram, in the third embodiment, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are all well controlled, thus the optical lens 100 of this embodiment has good imaging quality. Furthermore, regarding... Figure 6 (A) Figure 6 (B) and Figure 6 The wavelengths corresponding to each curve in (C) can be referred to in the first embodiment regarding... Figure 2 (A) in the middle Figure 2 (B) in the middle Figure 2 The content described in (C) will not be repeated here.

[0106] Fourth embodiment

[0107] The structural schematic diagram of the optical lens 100 disclosed in the fourth embodiment of this application is shown below. Figure 7 As shown, the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, an aperture stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a filter IR, and a protective glass CG arranged sequentially along the optical axis O from the object side to the image side.

[0108] Furthermore, in the fourth embodiment, the refractive power and surface shape of each lens are consistent with those of each lens in the third embodiment.

[0109] Other parameters in the fourth embodiment are given in Table 4a below, and the definitions of each parameter can be derived from the description of the foregoing embodiments, and will not be repeated here.

[0110] Table 4a

[0111]

[0112] Table 4b

[0113]

[0114] Please see Figure 8 ,Depend on Figure 8As can be seen from (A) the longitudinal spherical aberration diagram, (B) the astigmatism diagram, and (C) the distortion curve diagram, in the fourth embodiment, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are all well controlled, thus the optical lens 100 of this embodiment has good imaging quality. Furthermore, regarding... Figure 8 (A) Figure 8 (B) and Figure 8 The wavelengths corresponding to each curve in (C) can be referred to in the first embodiment regarding... Figure 2 (A) in the middle Figure 2 (B) in the middle Figure 2 The content described in (C) will not be repeated here.

[0115] Fifth Embodiment

[0116] The structural schematic diagram of the optical lens 100 disclosed in the fifth embodiment of this application is shown below. Figure 9 As shown, the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, an aperture stop STO, a sixth lens L6, a seventh lens L7, an eighth lens L8, a filter IR, and a protective glass CG arranged sequentially along the optical axis O from the object side to the image side.

[0117] Furthermore, in the fifth embodiment, the refractive power and surface shape of each lens are consistent with those of each lens in the first embodiment.

[0118] Other parameters in the fifth embodiment are given in Table 5a below, and the definitions of each parameter can be derived from the description of the foregoing embodiments, and will not be repeated here.

[0119] Table 5a

[0120]

[0121]

[0122] Table 5b

[0123]

[0124] Please see Figure 10 ,Depend on Figure 10 As can be seen from (A) the longitudinal spherical aberration diagram, (B) the astigmatism diagram, and (C) the distortion curve diagram, in the fifth embodiment, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are all well controlled, thus the optical lens 100 of this embodiment has good imaging quality. Furthermore, regarding... Figure 10 (A) Figure 10 (B) and Figure 10 The wavelengths corresponding to each curve in (C) can be referred to in the first embodiment regarding... Figure 2(A) in the middle Figure 2 (B) in the middle Figure 2 The content described in (C) will not be repeated here.

[0125] Sixth Embodiment

[0126] The structural schematic diagram of the optical lens 100 disclosed in the sixth embodiment of this application is shown below. Figure 11 As shown, the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, an aperture stop STO, a sixth lens L6, a seventh lens L7, an eighth lens L8, a filter IR, and a protective glass CG arranged sequentially along the optical axis O from the object side to the image side.

[0127] Furthermore, in the sixth embodiment, the refractive power and surface shape of each lens are consistent with those of each lens in the first embodiment.

[0128] Other parameters in the sixth embodiment are given in Table 6a below, and the definitions of each parameter can be derived from the description of the foregoing embodiments, and will not be repeated here.

[0129] Table 6a

[0130]

[0131]

[0132] Table 6b

[0133]

[0134] Please see Figure 12 ,Depend on Figure 12 As can be seen from (A) the longitudinal spherical aberration diagram, (B) the astigmatism diagram, and (C) the distortion curve diagram, in the sixth embodiment, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are all well controlled, thus the optical lens 100 of this embodiment has good imaging quality. Furthermore, regarding... Figure 12 (A) Figure 12 (B) and Figure 12 The wavelengths corresponding to each curve in (C) can be referred to in the first embodiment regarding... Figure 2 (A) in the middle Figure 2 (B) in the middle Figure 2 The content described in (C) will not be repeated here.

[0135] Seventh Embodiment

[0136] The structural schematic diagram of the optical lens 100 disclosed in the seventh embodiment of this application is shown below. Figure 13As shown, the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, an aperture stop STO, a sixth lens L6, a seventh lens L7, an eighth lens L8, a filter IR, and a protective glass CG arranged sequentially along the optical axis O from the object side to the image side.

[0137] Furthermore, in the seventh embodiment, the refractive power and surface shape of each lens are consistent with those of each lens in the first embodiment.

[0138] Other parameters in the seventh embodiment are given in Table 7a below, and the definitions of each parameter can be derived from the description of the foregoing embodiments, and will not be repeated here.

[0139] Table 7a

[0140]

[0141]

[0142] Table 7b

[0143]

[0144] Please see Figure 14 ,Depend on Figure 14 As can be seen from (A) the longitudinal spherical aberration diagram, (B) the astigmatism diagram, and (C) the distortion curve diagram, in the seventh embodiment, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are all well controlled, thus the optical lens 100 of this embodiment has good imaging quality. Furthermore, regarding... Figure 14 (A) Figure 14 (B) and Figure 14 The wavelengths corresponding to each curve in (C) can be referred to in the first embodiment regarding... Figure 2 (A) in the middle Figure 2 (B) in the middle Figure 2 The content described in (C) will not be repeated here.

[0145] Eighth embodiment

[0146] The structural schematic diagram of the optical lens 100 disclosed in the eighth embodiment of this application is shown below. Figure 15 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 positive refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with positive refractive power, an aperture STO, a sixth lens L6 with positive refractive power, a seventh lens L7 with negative refractive power, an eighth lens L8, a filter IR, and a protective glass CG, arranged sequentially from the object side to the image side along the optical axis O.

[0147] Furthermore, in the eighth embodiment, the surface shape of each lens is consistent with that of each lens in the first embodiment.

[0148] Other parameters in the eighth embodiment are given in Table 8a below, and the definitions of each parameter can be derived from the description of the foregoing embodiments, and will not be repeated here.

[0149] Table 8a

[0150]

[0151] Table 8b

[0152]

[0153]

[0154] Please see Figure 16 ,Depend on Figure 16 As can be seen from (A) the longitudinal spherical aberration diagram, (B) the astigmatism diagram, and (C) the distortion curve diagram, in the eighth embodiment, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are all well controlled, thus the optical lens 100 of this embodiment has good imaging quality. Furthermore, regarding... Figure 16 (A) Figure 16 (B) and Figure 16 The wavelengths corresponding to each curve in (C) can be referred to in the first embodiment regarding... Figure 2 (A) in the middle Figure 2 (B) in the middle Figure 2 The content described in (C) will not be repeated here.

[0155] Table 9 shows the values ​​of several relationships in the optical lenses 100 of the first to eighth embodiments.

[0156] Table 9

[0157]

[0158]

[0159] Please see Figure 17 This application also discloses a camera module 200, which includes a photosensitive chip 201 and the aforementioned optical lens 100. The photosensitive chip 201 is disposed 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 elaborated here. The camera module 200 with the optical lens 100 can achieve a miniaturized design of the optical lens 100, while also enabling the optical lens 100 to have a large field of view, thus improving the imaging quality of the optical lens 100.

[0160] Please see Figure 18 This application also discloses a terminal device 300, which includes a housing 301 and the aforementioned camera module 200, with the camera module 200 disposed within the housing 301. The terminal device 300 can be, but is not limited to, a mobile phone, tablet computer, laptop computer, smartwatch, monitor, etc. It is understood that the electronic device 300 with the aforementioned camera module 200 also possesses all the technical effects of the aforementioned optical lens 100, namely, it can achieve a miniaturized design of the optical lens 100 while simultaneously giving the optical lens 100 a large field of view, thus improving the imaging quality of the optical lens 100.

[0161] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application.

Claims

1. An optical lens, characterized in that, There are a total of eight lenses with refractive power, which successively include, from the object side to the image side along the optical axis: The first lens, having negative refractive power, with the object side surface of the first lens being convex near the optical axis and the image side surface of the first lens being concave near the optical axis; The second lens, having negative refractive power, with the object side surface of the second lens being concave near the optical axis; The third lens, having positive refractive power, with both the object side surface and the image side surface of the third lens being convex near the optical axis; The fourth lens, having positive refractive power, with the object side surface of the fourth lens being convex near the optical axis; The fifth lens, having refractive power; The sixth lens, having refractive power, with the object side surface of the sixth lens being convex near the optical axis; The seventh lens, having refractive power, with the image side surface of the seventh lens being convex near the optical axis; The eighth lens, having refractive power, with the image side surface of the eighth lens being concave near the optical axis; The optical lens satisfies the following relationships: 105° ≤ FOV ≤ 115°; 1.2 < SD11 / IMGH < 1.6; 1.3 < F3 / F < 2.3; Where, FOV is the maximum field angle of the optical lens, SD11 is half of the maximum effective aperture of the object side surface of the first lens, IMGH is the radius of the maximum effective imaging circle on the imaging surface of the optical lens, F is the effective focal length of the optical lens, and F3 is the effective focal length of the third lens.

2. The optical lens as described in claim 1, characterized in that, The optical lens satisfies the following relationships: 39mm < TTL×IMGH / F < 43mm; and / or, 6.2 < TTL / IMGH < 7; Where, 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.

3. The optical lens as described in claim 1, characterized in that, The optical lens satisfies the following relationships: 4.2 < TTL / SD11 < 5.6; and / or, 3 < R11 / F < 15; Where, 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, and R11 is the curvature radius of the object side surface of the first lens on the optical axis.

4. The optical lens as described in claim 1, characterized in that, Both the object side surface and the image side surface of the fifth lens are aspherical surfaces, and the optical lens satisfies the following relationships: 1 < |F6 / F| < 1.6; and / or, 3 < R11 / R12 < 13; and / or, 1.9 < R52 / R51 < 30; Where, F6 is the effective focal length of the sixth lens, R11 is the curvature radius of the object side surface of the first lens on the optical axis, R12 is the curvature radius of the image side surface of the first lens on the optical axis, R52 is the curvature radius of the image side surface of the fifth lens on the optical axis, and R51 is the curvature radius of the object side surface of the fifth lens on the optical axis.

5. The optical lens as described in claim 1, characterized in that, Both the object side surface and the image side surface of the eighth lens are aspherical surfaces, and the optical lens satisfies the following relationships: 0 < |R81 / R82| < 35; and / or, 1.4 < ∑CT / ∑AT < 2.1; and / or, 1.2 < SD11 / SD82 < 1.81; Where, R81 is the curvature radius of the object side of the eighth lens on the optical axis, R82 is the curvature radius of the image side of the eighth lens on the optical axis, ∑CT is the sum of the thicknesses of the first lens to the eighth lens on the optical axis respectively, ∑AT is the sum of the clearances of the first lens to the eighth lens on the optical axis, and SD82 is half of the maximum effective aperture of the image side of the eighth lens.

6. The optical lens as described in claim 1, characterized in that, The sixth lens and the seventh lens are cemented lenses, and the optical lens satisfies the following relational expressions: -15 < F1 / CT1 < -5; and / or, 0 < F / F67 < 0.3; and / or, 0.12 < (CT6 + CT7) / TTL < 0.2; Where, F1 is the effective focal length of the first lens, CT1 is the thickness of the first lens on the optical axis, F67 is the combined effective focal length of the sixth lens and the seventh lens, CT6 is the thickness of the sixth lens on the optical axis, CT7 is the thickness of the seventh lens on the optical axis, and TTL is the distance on the optical axis from the object side of the first lens to the imaging surface of the optical lens.

7. The optical lens as described in claim 1, characterized in that, The optical lens satisfies the following conditional expressions: 0.3 <|(VD6-VD7) / F67|<2 ; and / or, 1 < SD12 / SD21 < 1.2; and / or, 0 < CT56 / (CT5 + CT6) < 0.75; Where, VD6 is the Abbe number of the material used for the sixth lens, VD7 is the Abbe number of the material used for the seventh lens, F67 is the combined effective focal length of the sixth lens and the seventh lens, SD12 is half of the maximum effective aperture of the image side of the first lens, SD21 is half of the maximum effective aperture of the object side of the second lens, CT56 is the distance on the optical axis between the image side of the fifth lens and the object side of the sixth lens, CT5 is the thickness of the fifth lens on the optical axis, and CT6 is the thickness of the sixth lens on the optical axis.

8. The optical lens as described in claim 1, characterized in that, The optical lens satisfies the following conditional expressions: 0 < CT78 / CT8 < 1.7; and / or, 64° < FOV / FNO < 71°; and / or, 5.9 < TTL / F < 6.3; and / or, 1 < F / IMGH < 1.15; Where, CT78 is the distance on the optical axis between the image side of the seventh lens and the object side of the eighth lens, CT8 is the thickness of the eighth lens on the optical axis, FNO is the aperture number of the optical lens, and TTL is the distance on the optical axis from the object side of the first lens to the imaging surface of the optical lens.

9. A camera module, characterized in that, The imaging module includes a photosensitive chip and the optical lens according to any one of claims 1 to 8, and the photosensitive chip is disposed on the image side of the optical lens.

10. A terminal device, characterized in that, It includes a housing and the imaging module according to claim 9, and the imaging module is disposed in the housing.

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