Optical lens, camera module and electronic device

Abstract

The application discloses an optical lens, a camera module and electronic equipment, the optical lens has a variable aperture, and sequentially comprises, along an optical axis from an object side to an image side: a first lens with positive refractive power, the object side surface is a convex surface at a near optical axis; a second lens with negative refractive power, the object side surface and the image side surface are a convex surface and a concave surface respectively at the near optical axis; a third lens with positive refractive power, the object side surface is a convex surface at the near optical axis; a fourth lens with refractive power, the image side surface is a concave surface at the near optical axis; a fifth lens with refractive power; a sixth lens with negative refractive power, the object side surface and the image side surface are a convex surface and a concave surface respectively at the near optical axis; a seventh lens with positive refractive power, the object side surface and the image side surface are a convex surface and a concave surface respectively at the near optical axis; an eighth lens with negative refractive power, the object side surface and the image side surface are a convex surface and a concave surface respectively at the near optical axis; the optical lens satisfies: 25deg < FOV / FNO < 60deg. Thus, while meeting high imaging quality and miniaturization, the optical lens has the characteristic of a variable aperture.

Description

Technical Field

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

[0002] To meet the shooting needs of electronic devices in different scenarios, variable apertures are usually set in optical lenses. At the same time, with the advancement and development of optical imaging technology, people have higher and higher requirements for the pixel count of electronic devices, and mobile electronic devices are showing a trend towards smaller and thinner designs.

[0003] Therefore, how to rationally configure the number of lens elements, surface shape, and other parameters of an optical lens so that it can achieve the best possible image quality while possessing variable aperture and miniaturization characteristics has become an urgent problem to be solved. Summary of the Invention

[0004] This invention discloses an optical lens, a camera module, and an electronic device that can achieve high imaging quality and miniaturization while having a variable aperture.

[0005] To achieve the above objectives, in a first aspect, the present invention discloses an optical lens having a variable aperture and comprising eight lenses with refractive power, arranged sequentially along the optical axis from the object side to the image side: The first lens has positive refractive power, and the object side of the first lens is convex near the optical axis; The second lens has negative refractive power. The object side of the second lens is convex near the optical axis, and the image side of the second lens is concave near the optical axis. The third lens has positive refractive power, and the object side of the third lens is convex near the optical axis; The fourth lens has refractive power, and the image-side surface of the fourth lens is concave near the optical axis; The fifth lens has refractive power; The sixth lens has negative refractive power. The object-side surface of the sixth lens is convex near the optical axis, and the image-side surface of the sixth lens is concave near the optical axis. The seventh lens has positive refractive power. The object-side surface of the seventh lens is convex near the optical axis, and the image-side surface of the seventh lens is concave near the optical axis. The eighth lens has negative refractive power. The object side of the eighth lens is convex near the optical axis, and the image side of the eighth lens is concave near the optical axis. The optical lens satisfies the following relationship: 25deg <FOV / FNO<60deg; Wherein, FOV is the maximum field of view of the optical lens, and FNO is the aperture number of the optical lens.

[0006] Secondly, the present invention discloses a camera module, which includes an image sensor and an optical lens as described in the first aspect above, wherein the image sensor is disposed on the image side of the optical lens. The camera module with this optical lens can achieve high imaging quality and miniaturization while also possessing a variable aperture.

[0007] Thirdly, the present invention discloses an electronic device comprising a housing and a camera module as described in the second aspect above, the camera module being disposed within the housing. The electronic device having this camera module can achieve high imaging quality and miniaturization while possessing a variable aperture.

[0008] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention provides an optical lens, a camera module and an electronic device. The optical lens has a variable aperture, which allows the aperture size of the optical lens to be adjusted so that the optical lens can have high imaging quality under different shooting conditions, thereby meeting different shooting needs and expanding the application range of the optical lens.The first lens of this optical lens has positive refractive power. Combined with the convex design of its object-side surface near the optical axis, this allows for the entry of incident light rays at large angles, expanding the field of view and achieving a wide field of view. Simultaneously, it effectively converges the incident light rays, facilitating control of the first lens's dimensions along the perpendicular optical axis to meet the requirements of miniaturization. The second lens, with negative refractive power, corrects aberrations generated by the first lens, improving the image quality. Furthermore, the convex and concave design of the second lens's object-side and image-side surfaces near the optical axis allows for a better match between the surface profiles of the second and first lenses, resulting in a smoother transition of incident light rays. To correct off-axis aberrations and reduce the tolerance sensitivity of the optical lens, the third lens also facilitates the proper configuration of the air gap between the front and rear lenses, reducing the risk of ghosting and thus improving the image quality of the optical lens. The third lens has positive refractive power, and its object-side surface is convex near the optical axis, further enhancing the convergence of light rays near the optical axis and delaying the incident angle. The fourth and fifth lenses have refractive power, which helps correct distortion, spherical aberration, and astigmatism produced by the first to third lenses, promoting aberration balance in the optical lens. Simultaneously, the image-side surface of the fourth lens is concave near the optical axis, which helps correct field curvature and improve the image quality of the optical lens. The sixth lens has negative refractive power, and combined with the object-side surface of the sixth lens... The image-side surfaces are convex and concave near the optical axis, which balances aberrations that are difficult to balance with the fourth and fifth lenses, thus improving the aberration balance of the optical lens, resolving power, and overall image quality. The seventh lens has positive refractive power. Combined with the convex and concave surface configuration of its object-side and image-side surfaces near the optical axis, it effectively converges edge field-of-view rays, reducing their deflection and correcting edge field-of-view aberrations caused by incident rays passing through the first to sixth lenses. It also ensures a high degree of surface matching between the seventh and sixth lenses, reducing tolerance sensitivity and further improving image quality. This, combined with the negative refractive power... The eighth lens balances the uncorrectable aberrations generated by the front lens group (the first to the seventh lenses), promoting aberration balance in the optical lens and improving its resolving power, thereby enhancing its image quality. The eighth lens's convex and concave near-optical-axis object-side and image-side surfaces, respectively, not only reduce the lens's tolerance sensitivity but also shorten its overall length, enabling miniaturization. Furthermore, the concave image-side surface near the optical axis suppresses the light exit angle, allowing light rays from the edge of the field of view to enter the image plane with a smaller deflection angle. This results in higher relative brightness at the image plane edges, effectively preventing vignetting and improving overall image quality.

[0009] In addition, the optical lens satisfies 25deg<FOV / FNO<60deg. By constraining the ratio of the maximum field of view angle to the f-number of the optical lens, it is possible to balance the design difficulty and the demand for the field of view angle, while keeping the aperture within a reasonable range, so as to provide a combined effect of wide viewing angle and large aperture. When the ratio is lower than the lower limit, there is a contradiction between the wide viewing angle and the large aperture. When the optical lens takes into account the performance of small viewing angle and large aperture, the design difficulty of the optical lens increases, and the aperture of the lens further expands, which is not conducive to reducing tolerance sensitivity and improving manufacturing yield; when the optical lens takes into account the performance of large viewing angle and small aperture, it is easy to cause insufficient relative illumination at the edge field of view, resulting in a decrease in the resolving power of the optical lens. When the ratio is higher than the upper limit, the optical lens needs to take into account both the wide viewing angle and the large aperture at the same time, which puts extremely high requirements on the design of the optical lens, and it is difficult to ensure the tolerance sensitivity of the lens. Brief Description of the Drawings

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without any creative effort.

[0011] Figure 1 is a schematic structural diagram of the optical lens disclosed in the first embodiment of the present application in a first aperture state; Figure 2 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion curve diagram of the optical lens disclosed in the first embodiment of the present application in the first aperture state; Figure 3 is a schematic structural diagram of the optical lens disclosed in the first embodiment of the present application in a second aperture state; Figure 4 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion curve diagram of the optical lens disclosed in the first embodiment of the present application in the second aperture state; Figure 5 is a schematic structural diagram of the optical lens disclosed in the first embodiment of the present application in a third aperture state; Figure 6 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion curve diagram of the optical lens disclosed in the first embodiment of the present application in the third aperture state; Figure 7 is a schematic structural diagram of the optical lens disclosed in the second embodiment of the present application in a first aperture state; Figure 8 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion curve diagram of the optical lens disclosed in the second embodiment of the present application in the first aperture state; Figure 9These are the longitudinal spherical aberration diagram, astigmatism diagram, and distortion curve diagram of the optical lens in the second aperture state disclosed in the second embodiment of this application; Figure 10 These are the longitudinal spherical aberration diagram, astigmatism diagram, and distortion curve diagram of the optical lens in the third aperture state disclosed in the second embodiment of this application; Figure 11 This is a schematic diagram of the structure of the optical lens in the first aperture state disclosed in the third embodiment of this application; Figure 12 These are the longitudinal spherical aberration diagram, astigmatism diagram, and distortion curve diagram of the optical lens in the first aperture state disclosed in the third embodiment of this application; Figure 13 These are the longitudinal spherical aberration diagram, astigmatism diagram, and distortion curve diagram of the optical lens in the second aperture state disclosed in the third embodiment of this application; Figure 14 These are the longitudinal spherical aberration diagram, astigmatism diagram, and distortion curve diagram of the optical lens in the third aperture state disclosed in the third embodiment of this application; Figure 15 This is a schematic diagram of the structure of the optical lens in the first aperture state disclosed in the fourth embodiment of this application; Figure 16 These are the longitudinal spherical aberration diagram, astigmatism diagram, and distortion curve diagram of the optical lens in the first aperture state disclosed in the fourth embodiment of this application; Figure 17 These are the longitudinal spherical aberration diagram, astigmatism diagram, and distortion curve diagram of the optical lens in the second aperture state disclosed in the fourth embodiment of this application; Figure 18 This is the longitudinal spherical aberration diagram, astigmatism diagram, and distortion curve diagram of the optical lens in the third aperture state disclosed in the fourth embodiment of this application; Figure 19 This is a schematic diagram of the structure of the optical lens in the first aperture state disclosed in the fifth embodiment of this application; Figure 20 These are the longitudinal spherical aberration diagram, astigmatism diagram, and distortion curve diagram of the optical lens in the first aperture state disclosed in the fifth embodiment of this application; Figure 21 These are the longitudinal spherical aberration diagram, astigmatism diagram, and distortion curve diagram of the optical lens in the second aperture state disclosed in the fifth embodiment of this application; Figure 22 This is the longitudinal spherical aberration diagram, astigmatism diagram, and distortion curve diagram of the optical lens in the third aperture state disclosed in the fifth embodiment of this application; Figure 23 This is a schematic diagram of the camera module disclosed in this application; Figure 24 This is a schematic diagram of the structure of the electronic device disclosed in this application. Detailed Implementation

[0012] The technical solution of the present invention will be further described below with reference to the embodiments and accompanying drawings.

[0013] Please see Figure 1 According to a first aspect of this application, an optical lens 100 is disclosed. The optical lens 100 comprises eight lenses with refractive power, including a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8 arranged sequentially from the object side to the image side along the optical axis O. During imaging, light rays enter 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 sequentially from the object side of the first lens L1, and are finally imaged on the imaging plane 101 of the optical lens 100. The first lens L1 has positive refractive power, the second lens L2 has negative refractive power, the third lens L3 has positive refractive power, the fourth lens L4 has refractive power, the fifth lens L5 has refractive power, the sixth lens L6 has negative refractive power, the seventh lens L7 has positive refractive power, and the eighth lens L8 has negative refractive power.

[0014] Furthermore, the object-side surface 11 of the first lens is convex near the optical axis O, and the image-side surface 12 of the first lens is either concave or convex near the optical axis O; the object-side surface 21 of the second lens is convex near the optical axis O, and the image-side surface 22 of the second lens is concave near the optical axis O; the object-side surface 31 of the third lens is convex near the optical axis O, and the image-side surface 32 of the third lens is either concave or convex near the optical axis O; the object-side surface 41 of the fourth lens is either concave or convex near the optical axis O, and the image-side surface 42 of the fourth lens is either concave or convex near the optical axis O. The object-side surface 51 of the fifth lens is concave or convex near the optical axis O, and the image-side surface 52 of the fifth lens is concave or convex near the optical axis O; the object-side surface 61 of the sixth lens is convex near the optical axis O, and the image-side surface 62 of the sixth lens is concave near the optical axis O; the object-side surface 71 of the seventh lens is convex near the optical axis O, and the image-side surface 72 of the seventh lens is concave near the optical axis O; the object-side surface 81 of the eighth lens is convex near the optical axis O, and the image-side surface 82 of the eighth lens is concave near the optical axis O.

[0015] By rationally configuring the surface shape and refractive power of each lens from the first lens L1 to the eighth lens L8, the optical lens 100 can meet the requirements of miniaturization while maintaining high imaging quality.

[0016] Furthermore, in some embodiments, the first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, and eighth lens L8 are all made of plastic. In this case, the optical lens 100 can reduce weight and lower cost. In other embodiments, the first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, and eighth lens L8 can also be made of glass. In this case, the optical lens 100 can have good optical performance, while also reducing the temperature drift sensitivity of the optical lens 100.

[0017] In some embodiments, to increase the freedom of surface design, 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 may all be aspherical lenses. It is understood that in other embodiments, to facilitate manufacturing, 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 may also be spherical lenses.

[0018] In some embodiments, the optical lens 100 further includes an infrared filter 90, which is disposed between the eighth lens L8 and the imaging surface 101 of the optical lens 100. Optionally, the infrared filter 90 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.

[0019] In other embodiments, the infrared filter 90 may also be an infrared bandpass filter, allowing infrared light to pass through and reflecting visible light to achieve 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.

[0020] It is understood that the infrared filter 90 can be made of plastic, optical glass with coating, or other materials. The choice can be made according to actual needs, and no specific limitation is made in this embodiment.

[0021] In some embodiments, the optical lens 100 further includes an aperture stop STO, which may be an aperture stop and / or a field stop. For example, the aperture stop STO may be an aperture stop, or it may be a field stop, or it may be both an aperture stop and a field stop. By placing the aperture stop STO on the object side of the first lens L1, the exit pupil can be moved away from the imaging plane 101, and the effective diameter of the optical lens 100 can be reduced without reducing the telecentricity of the optical lens 100, thereby achieving miniaturization.

[0022] Optionally, the aperture stop STO is a variable aperture. By adjusting the distance D1 between the aperture stop STO and the object-side surface 11 of the first lens, the opening size of the aperture stop STO, and the distance between the infrared filter 90 and the imaging surface 101, the aperture size of the optical lens 100 can be adjusted. This allows the optical lens 100 to have a variable aperture characteristic, enabling it to adapt to different shooting conditions and meet different shooting needs, thereby expanding the application range of the optical lens 100 and improving its imaging quality. This invention illustrates the optical lens 100 with the aperture stop STO in three different states, allowing the optical lens 100 to have a maximum aperture state, a minimum aperture state, and an intermediate state. This not only helps in understanding and implementing the optical lens 100 in different states but also allows control over the aperture variation range of the optical lens 100 to achieve a wider range of aperture adjustment. Understandably, during the adjustment of the aperture stop STO, the aperture size of the optical lens 100 also changes accordingly, enabling the optical lens 100 to switch between multiple different aperture states, so that the optical lens 100 has multiple aperture states, including but not limited to the three states mentioned above.

[0023] Please refer to the following: Figures 1 to 6 Optionally, when the aperture stop STO has three different states, the optical lens 100 can have different aperture numbers. Based on this, to facilitate the description of the three states of the aperture stop STO, the state with the largest aperture of the optical lens 100 is defined as the first aperture state (e.g., ...). Figure 1 As shown), at this time, the aperture number of the optical lens 100 is FNO1, and the aperture stop STO of the optical lens 100 is called the aperture of the optical lens 100 in the first aperture state; the intermediate state of the optical lens 100 is defined as the second aperture state (as shown). Figure 3 As shown), at this time, the aperture number of the optical lens 100 is FNO2, and the aperture stop STO of the optical lens 100 is called the aperture of the optical lens 100 in the second aperture state; the minimum aperture state of the optical lens 100 is defined as the third aperture state (as shown). Figure 5 As shown), at this time, the aperture number of the optical lens 100 is FNO3, and the aperture stop STO is called the aperture of the optical lens 100 in the third aperture state.

[0024] It is understood that in other embodiments, the aperture stop STO may also be disposed between other lenses, and the setting may be adjusted according to the actual situation. This embodiment does not make specific limitations on this.

[0025] In some embodiments, the optical lens 100 satisfies the relational expression: 25deg<FOV / FNO<60deg, for example, FOV / FNO=26.845deg, 28.857deg, 28.714deg, 29.107deg, 29.143deg, 40.000deg, 40.200deg, 40.750deg, 40.800deg, 52.581deg, 52.645deg, 54.324deg, 54.595deg or 58.631deg, etc. Wherein, FOV is the maximum field of view of the optical lens 100, and FNO is the f-number of the optical lens 100.

[0026] By constraining the ratio of the maximum field of view to the f-number of the optical lens 100, it is possible to balance the design difficulty and the demand for the field of view, and meanwhile keep the aperture within a reasonable range, so as to provide a combined effect of wide viewing angle and large aperture. When the ratio is lower than the lower limit, there is a contradiction between the wide viewing angle and the large aperture. When the optical lens 100 takes into account the performance of small viewing angle and large aperture, the design difficulty of the optical lens 100 increases, and the caliber of the lens further expands, which is not conducive to reducing tolerance sensitivity and improving manufacturing yield; when the optical lens 100 takes into account the performance of large viewing angle and small aperture, it is easy to cause insufficient relative illumination at the edge field of view, resulting in a decrease in the resolving power of the optical lens 100. When the ratio is higher than the upper limit, the optical lens 100 needs to take into account both the wide viewing angle and the large aperture at the same time, which imposes extremely high design requirements on the optical lens 100, and it is difficult to ensure the tolerance sensitivity of the lens.

[0027] It can be understood that, as can be seen from the foregoing, the stop STO of the optical lens 100 has a plurality of different stop states, so that the optical lens 100 has different aperture sizes. Based on this, FNO1, FNO2, and FNO3 all satisfy the above relational expression: 25deg<FOV / FNO<60deg. Wherein, FNO1 is the f-number of the optical lens 100 in the first aperture state, FNO2 is the f-number of the optical lens 100 in the second aperture state, and FNO3 is the f-number of the optical lens 100 in the third aperture state.

[0028] In some embodiments, the optical lens 100 satisfies the relational expression: 0.6<R81 / f<0.75, for example, R81 / f=0.612, 0.633, 0.651, 0.660, 0.666, 0.674, 0.685, 0.707, 0.724 or 0.748, etc. Wherein, R81 is the radius of curvature of the object-side surface 81 of the eighth lens at the optical axis O, and f is the focal length of the optical lens 100.

[0029] By constraining the ratio of the radius of curvature of the object-side surface 81 of the eighth lens L8 to the focal length of the optical lens 100, on the one hand, the shape of the eighth lens L8 can be made more reasonable, so as to minimize the chromatic aberration and spherical aberration of the optical lens 100 to the greatest extent, promote the aberration balance of the optical lens 100, and can also reasonably distribute the optical power of the eighth lens L8, so as to enhance the light gathering capability of the optical lens 100 and improve the imaging quality of the optical lens 100; on the other hand, it can also limit the focal length of the optical lens 100, which is beneficial to compressing the total length of the optical lens 100 (i.e., the distance on the optical axis O from the object-side surface 11 of the first lens to the imaging surface 101 of the optical lens 100), and is conducive to meeting the miniaturization design requirements of the optical lens 100.

[0030] In some embodiments, considering that the magnitude of the radius of curvature of a lens represents the variation trend of the surface shape of the lens near the optical axis O, based on this, the optical lens 100 satisfies the relational expression: 2<R81 / R82<3, for example, R81 / R82=2.171, 2.256, 2.334, 2.347, 2.364, 2.441, 2.578, 2.695, 2.786 or 2.921, etc. Wherein R82 is the radius of curvature of the image-side surface 82 of the eighth lens at the optical axis O.

[0031] By constraining the ratio of the radii of curvature of the object-side surface 81 of the eighth lens and the image-side surface 82 of the eighth lens, the difference between the radii of curvature of the object-side surface 81 of the eighth lens and the image-side surface 82 of the eighth lens can be reasonably limited. When the optical lens 100 satisfies the above relational expression, the radius of curvature of the object-side surface 81 of the eighth lens is larger than the radius of curvature of the image-side surface 82 of the eighth lens, which can keep the incident light rays at a small deflection angle inside the optical lens 100, and is beneficial to correcting the astigmatism generated by the front lens group (i.e., the first lens L1 to the seventh lens L7), so as to improve the imaging quality of the optical lens 100.

[0032] In some embodiments, the optical lens 100 satisfies the relational expression: 5<f8 / SAG81<8, or 8<f8 / SAG82<37, or 5<f8 / SAG81<8 and 8<f8 / SAG82<37, for example, f8 / SAG81=5.234, 5.426, 5.866, 6.023, 6.624, 6.673, 6.925, 7.280, 7.552 or 7.832, etc., and f8 / SAG82=8.264, 8.871, 11.105, 13.323, 17.253, 23.724, 26.281, 31.815, 34.178 or 36.947, etc. Wherein f8 is the focal length of the eighth lens L8, SAG81 is the distance in the direction parallel to the optical axis O from the intersection of the object side 81 of the eighth lens and the optical axis O to the maximum effective half-aperture position of the object side 81 of the eighth lens (i.e., the sagittal height at the maximum effective radius of the object side 81 of the eighth lens), and SAG82 is the distance in the direction parallel to the optical axis O from the intersection of the image side 82 of the eighth lens and the optical axis O to the maximum effective half-aperture position of the image side 82 of the eighth lens (i.e., the sagittal height at the maximum effective radius of the image side 82 of the eighth lens).

[0033] By constraining the ratio of the focal length of the eighth lens L8 to the sagittal height at the maximum effective half-aperture of the object side 81 of the eighth lens, and the ratio of the focal length of the eighth lens L8 to the sagittal height at the maximum half-aperture of the image side 82 of the eighth lens, the refractive power and the lens shape of the eighth lens L8 can be reasonably configured to minimize chromatic aberration and spherical aberration to the greatest extent, and improve the imaging quality of the optical lens 100. At the same time, constraining the focal length and the sagittal height of the eighth lens L8 is beneficial to compressing the size of the optical lens 100, so as to meet the miniaturization design requirement of the optical lens 100.

[0034] In some embodiments, the optical lens 100 satisfies the relational expression: 2<(SAG81+SAG82) / CT8<4, for example, (SAG81+SAG82) / CT8=2.150, 2.409, 2.522, 2.734, 2.911, 3.088, 3.426, 3.663, 3.816 or 3.937, etc. Wherein SAG81 is the distance in the direction parallel to the optical axis O from the intersection of the object side 81 of the eighth lens and the optical axis O to the maximum effective half-aperture position of the object side 81 of the eighth lens (i.e., the sagittal height at the maximum effective radius of the object side 81 of the eighth lens), SAG82 is the distance in the direction parallel to the optical axis O from the intersection of the image side 82 of the eighth lens and the optical axis O to the maximum effective half-aperture position of the image side 82 of the eighth lens (i.e., the sagittal height at the maximum effective radius of the image side 82 of the eighth lens), and CT8 is the thickness of the eighth lens L8 on the optical axis O (i.e., the center thickness of the eighth lens L8).

[0035] By limiting the sag at the maximum effective semi-aperture of the object side 81 of the eighth lens and the image side 82 of the eighth lens, as well as the center thickness of the eighth lens L8, the thickness uniformity of the eighth lens L8 can be improved, avoiding the lens being too thin or too thick, so as to reduce the incident angle of light on the imaging surface 101 and lower the sensitivity of the optical lens 100. Meanwhile, by matching the surface profiles where the object side 81 of the eighth lens and the image side 82 of the eighth lens are respectively a convex surface and a concave surface at the paraxial axis O, the surface profile of the eighth lens L8 can also have a plurality of inflection points, so as to correct the distortion and field curvature generated by the front lens group, make the refractive power distribution of the lens of the optical lens 100 close to the imaging surface 101 more uniform, and improve the imaging quality of the optical lens 100.

[0036] In some embodiments, the optical lens 100 satisfies the relational expressions: 0.5<Yc72 / SD72<0.7, or 0.3<Yc82 / SD82<0.5, or 0.5<Yc72 / SD72<0.7 and 0.3<Yc82 / SD82<0.5. For example, Yc72 / SD72=0.536, 0.554, 0.573, 0.584, 0.601, 0.633, 0.636, 0.655, 0.662 or 0.687, etc., and Yc82 / SD82=0.325, 0.364, 0.391, 0.395, 0.400, 0.409, 0.412, 0.436, 0.468 or 0.483, etc. Wherein, Yc72 is the vertical distance from the off-axis critical point of the image side 72 of the seventh lens to the optical axis O (i.e., the axial height of the image side 72 of the seventh lens, see Figure 1 ), Yc82 is the vertical distance from the off-axis critical point of the image side 82 of the eighth lens to the optical axis O (i.e., the axial height of the image side 82 of the eighth lens, see Figure 1 ), SD72 is the maximum effective semi-aperture of the image side 72 of the seventh lens, and SD82 is the maximum effective semi-aperture of the image side 82 of the eighth lens.

[0037] Since the seventh lens L7 and the eighth lens L8 are the two lenses closest to the imaging surface 101, the maximum effective half-caliber of their image-side surfaces determines the light beam that finally reaches the imaging surface 101. Therefore, by restricting the ratio of the vertical axis height of the image-side surface 72 of the seventh lens to its maximum effective half-caliber, or by restricting the ratio of the vertical axis height of the image-side surface 82 of the eighth lens to its maximum effective half-caliber, or by restricting both the ratio of the vertical axis height of the image-side surface 72 of the seventh lens to its maximum effective half-caliber and the ratio of the vertical axis height of the image-side surface 82 of the eighth lens to its maximum effective half-caliber, the maximum effective half-calibers of the image-side surfaces of the seventh lens L7 and the eighth lens L8 are matched with the size of the image sensor, so as to ensure that a sufficient light beam is present on the imaging surface 101, thereby increasing the size of the imaging surface 101 of the optical lens 100, and further facilitating matching with an image sensor of a larger size. Meanwhile, by combining the surface profile arrangement that both the image-side surface 72 of the seventh lens and the image-side surface 82 of the eighth lens are concave at the paraxial O, the seventh lens L7 and the eighth lens L8 can be provided with a plurality of inflection points, which is beneficial for the light rays of the edge field of view to enter the optical lens 100, and simultaneously corrects the distortion and field curvature generated by the first lens L1 to the sixth lens L6, so that the refractive power distribution of the lenses of the optical lens 100 close to the imaging surface 101 is more uniform, so as to improve the imaging quality of the optical lens 100.

[0038] In some embodiments, the optical lens 100 satisfies the relational expression: 1<f1 / f<1.2, or 1.7<|f2 / f|<2.3, or 1<f1 / f<1.2 and 1.7<|f2 / f|<2.3. For example, f1 / f=1.016, 1.032, 1.073, 1.102, 1.118, 1.126, 1.137, 1.154, 1.170 or 1.183, etc., and |f2 / f|=1.763, 1.852, 1.861, 1.936, 2.000, 2.072, 2.154, 2.210, 2.268 or 2.287, etc. Herein, f1 is the focal length of the first lens L1, and f2 is the focal length of the second lens L2.

[0039] By restricting the ratio of the focal length of the first lens L1 to the focal length of the optical lens 100, it is possible to facilitate the reasonable configuration of the refractive power of the first lens L1, to support the large field of view angle and large aperture characteristics of the optical lens 100, to facilitate converging the incident light rays entering the optical lens 100 from the object side, reducing the deflection angle, thereby reducing the introduced aberration amount of the optical lens 100, facilitating the aberration balance of the optical lens 100, and improving the imaging quality of the optical lens 100.

[0040] In addition, by constraining the ratio of the focal length of the second lens L2 to the focal length of the optical lens 100, it is beneficial to reasonably configure the refractive power of the second lens L2, so as to slow down the angle of the light incident from the first lens L1, improve the relative illumination of the optical lens 100, and thus further improve the imaging quality of the optical lens 100.

[0041] In some embodiments, the optical lens 100 satisfies the relational expression: 2<|f6 / f|<3.5, or 1<f7 / f<1.2, or 2<|f6 / f|<3.5 and 1<f7 / f<1.2. For example, |f6 / f|=2.150, 2.346, 2.541, 2.612, 2.707, 2.966, 3.164, 3.205, 3.375, 3.482, etc., and f7 / f=1.025, 1.049, 1.068, 1.096, 1.114, 1.147, 1.151, 1.152, 1.179 or 1.192, etc. Wherein, f6 is the focal length of the sixth lens L6, and f7 is the focal length of the seventh lens L7.

[0042] By constraining the ratio of the focal length of the sixth lens L6 to the focal length of the optical lens 100, and the ratio of the focal length of the seventh lens L7 to the focal length of the optical lens 100, it is beneficial to correct the aberrations introduced by the optical lens 100 through the first lens L1 to the fifth lens L5, facilitate aberration balance, and improve the imaging quality of the optical lens 100.

[0043] In some embodiments, the optical lens 100 satisfies the relational expression: 0.9<|f8 / f|<1.3, for example, |f8 / f|=0.948, 0.956, 0.994, 0.996, 1.022, 1.106, 1.181, 1.215, 1.246 or 1.287, etc. Wherein, f8 is the focal length of the eighth lens L8.

[0044] By constraining 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 be corrected 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.

[0045] In some embodiments, the optical lens 100 satisfies the relational expression: 6<f123<9, for example, f123=6.255, 6.439, 6.704, 7.103, 7.622, 7.691, 7.913, 8.066, 8.487 or 8.736, etc.; wherein, f123 is the combined focal length of the first lens L1, the second lens L2 and the third lens L3.

[0046] By constraining the combined focal length of the first lens L1, the second lens L2 and the third lens L3, the combined lens of the first lens L1, the second lens L2 and the third lens L3 is made a positive lens, so that the sum of the edge thicknesses of the combined lens is smaller than the sum of the center thicknesses, and the combined lens has positive refractive power, which is beneficial to the gentle transition of incident light rays with large angles, thereby reducing the aberration of the optical lens 100 and improving the imaging quality of the optical lens 100. Meanwhile, the surface profiles of the combined lens of the first lens L1, the second lens L2 and the third lens L3 are simple, which not only enables a small variation, so that the amount of aberration introduced by the optical lens 100 is controllable, is beneficial to reducing the pressure of aberration correction from the fourth lens L4 to the eighth lens L8, and promotes the aberration balance of the optical lens 100, but also can improve the machinability of the first lens L1 to the third lens L3, reduce the tolerance sensitivity of the combined lens, so as to facilitate the improvement of the imaging quality of the optical lens 100.

[0047] In some embodiments, the optical lens 100 satisfies the relational expression: 0.8<IMGH / f<0.9, or, 0.2mm -1 <(IMGH*2) / f / TTL<0.3mm -1 , or, 0.8<IMGH / f<0.9 and 0.2mm -1 <(IMGH*2) / f / TTL<0.3mm -1 . For example, IMGH / f=0.816, 0.824, 0.837, 0.843, 0.858, 0.866, 0.874, 0.875, 0.889 or 0.894, etc., (IMGH*2) / f / TTL=0.203mm -1 , 0.207mm -1 , 0.209mm -1 , 0.216mm -1 , 0.222mm -1 , 0.233mm -1 , 0.256mm -1 , 0.274mm -1 , 0.283mm -1 or 0.291mm -1 , etc. Wherein, IMGH is the radius of the maximum effective imaging circle of the optical lens 100 (i.e., the semi-image height of the optical lens 100), and TTL is the distance on the optical axis O from the object side 11 of the first lens to the imaging surface 101 of the optical lens 100 (i.e., the total length of the optical lens 100).

[0048] By constraining the ratio of the semi-image height to the focal length of the optical lens 100, it is beneficial for the optical lens 100 to have the feature of a large image plane while meeting miniaturization, so as to realize long-distance shooting.

[0049] In addition, by limiting the total length, focal length of the optical lens 100 and the radius of the maximum effective imaging circle, the ratio of the total length of the optical lens 100 to the imaging surface 101 can be made relatively small. Through reasonable structural layout, it is beneficial to realize the miniaturization of the optical lens 100.

[0050] In some embodiments, the optical lens 100 satisfies the relational expression: 0.8<DL / TTL<0.9, for example, DL / TTL=0.813, 0.826, 0.832, 0.852, 0.859, 0.860, 0.870, 0.878, 0.884 or 0.895, etc. Wherein, TTL is the distance on the optical axis O from the object side surface 11 of the first lens to the imaging surface 101 of the optical lens 100, and DL is the distance on the optical axis O from the object side surface 11 of the first lens to the image side surface 82 of the eighth lens.

[0051] By restricting the ratio of the distance on the optical axis O from the object side surface 11 of the first lens to the image side surface 82 of the eighth lens to the total length of the optical lens 100, the structural layout of the optical lens 100 is made more reasonable, which is beneficial to increasing the spatial dimension from the image side surface 82 of the eighth lens to the image sensor while satisfying the miniaturization, thereby facilitating the structural design of the camera module and improving the structural reliability of the camera module.

[0052] In some embodiments, the optical lens 100 satisfies the relational expression: 0.15<(R61-R62) / (R61+R62)<0.3, or 1.0<(CT1+CT3) / (CT4+CT5)<3.0, or 0.15<(R61-R62) / (R61+R62)<0.3 and 1.0<(CT1+CT3) / (CT4+CT5)<3.0. For example, (R61-R62) / (R61+R62)=0.155, 0.168, 0.173, 0.197, 0.206, 0.227, 0.237, 0.244, 0.275 or 0.293, etc., (CT1+CT3) / (CT4+CT5)=1.121, 1.255, 1.398, 1.517, 1.581, 1.851, 2.367, 2.583, 2.736 or 2.842, etc. Wherein, R61 is the radius of curvature of the object side surface 61 of the sixth lens at the optical axis O, R62 is the radius of curvature of the image side surface 62 of the sixth lens at the optical axis O, CT1 is the thickness of the first lens L1 on the optical axis O, CT3 is the thickness of the third lens L3 on the optical axis O, CT4 is the thickness of the fourth lens L4 on the optical axis O, and CT5 is the thickness of the fifth lens L5 on the optical axis O.

[0053] By reasonably constraining the ratio of the radius of curvature of the object side 61 of the sixth lens to the radius of curvature of the image side 62 of the sixth lens, the relationship between the radii of curvature of the object side 61 and the image side 62 of the sixth lens can be controlled within a certain range, so as to effectively distribute the optical deflection angle borne by the sixth lens L6, improve off-axis field astigmatism, and improve the imaging quality of the optical lens 100.

[0054] Furthermore, by rationally configuring the center thicknesses of the first lens L1, the third lens L3, the fourth lens L4, and the fifth lens L5, the structural layout of the optical lens 100 is made more reasonable. This helps to reduce the sensitivity of the optical lens 100 and alleviate the incident angle of light, thereby reducing the amount of aberration introduced and improving the imaging quality of the optical lens 100. At the same time, by constraining the center thickness of each lens, the overall length of the optical lens 100 can be shortened to meet the miniaturization design requirements of the optical lens 100.

[0055] Furthermore, the object-side surface and image-side surface of any one of the lenses from the first lens L1 to the eighth lens L8 are aspherical surfaces, and the surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0056] Where 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 vertex of the aspherical surface, c=1 / Y, Y is the radius of curvature (i.e., the paraxial curvature c is the reciprocal of the radius of Y in Table 1), k is the conic constant, and Ai is the coefficient corresponding to the i-th higher-order term in the aspherical surface shape formula.

[0057] The optical lens 100 of this embodiment will be described in detail below with reference to specific parameters.

[0058] First Embodiment 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 an aperture stop STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and an infrared filter 90, arranged sequentially along the optical axis O from the object side to the image side. The materials of the first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, and eighth lens L8 can be found in the specific embodiments described above, and will not be repeated here.

[0059] Furthermore, the first lens L1 has positive refractive power, the second lens L2 has negative refractive power, the third lens L3 has positive refractive power, the fourth lens L4 has negative refractive power, the fifth lens L5 has positive refractive power, the sixth lens L6 has negative refractive power, the seventh lens L7 has positive refractive power, and the eighth lens L8 has negative refractive power.

[0060] Furthermore, the object-side surface 11 and the image-side surface 12 of the first lens are convex and concave near the optical axis O, respectively; the object-side surface 21 and the image-side surface 22 of the second lens are convex and concave near the optical axis O, respectively; the object-side surface 31 and the image-side surface 32 of the third lens are convex and concave near the optical axis O, respectively; the object-side surface 41 and the image-side surface 42 of the fourth lens are convex and concave near the optical axis O, respectively; the object-side surface 51 and the image-side surface 52 of the fifth lens are concave and convex near the optical axis O, respectively; the object-side surface 61 and the image-side surface 62 of the sixth lens are convex and concave near the optical axis O, respectively; the object-side surface 71 and the image-side surface 72 of the seventh lens are convex and concave near the optical axis O, respectively; and the object-side surface 81 and the image-side surface 82 of the eighth lens are convex and concave near the optical axis O, respectively.

[0061] In the first embodiment, Figure 1 , Figure 3 as well as Figure 5 Schematic diagrams are shown of the optical lens 100 with the aperture stop STO in three different states, wherein, Figure 3 and Figure 5 The position of the aperture stop STO within the optical lens 100 remains unchanged; only the focal plane changes. When the aperture stop STO is in three different states, the optical lens 100 can have different aperture numbers. Therefore, for ease of description of the three states of the aperture stop STO, the state with the largest aperture of the optical lens 100 is defined as the first aperture state FNO1 (see...). Figure 1 The intermediate state of optical lens 100 is the second aperture state FNO2 (see...). Figure 3 The smallest aperture setting of the 100mm optical lens is the third aperture setting, FNO3 (see [link]). Figure 5It is understood that the aperture stop STO includes, but is not limited to, these three states. By adjusting the distance D1 between the aperture stop STO and the object side 11 of the first lens L1, the size of the aperture stop STO's opening, and the distance between the infrared filter 90 and the imaging plane 101, the aperture stop STO can have other different states, so that the optical lens 100 can obtain different aperture numbers. The aperture stop STO in the following embodiments also has three different states, so that the optical lens 100 has the characteristic of variable aperture. However, the following embodiments will not elaborate on the examples of the three different states of the aperture stop STO, but only use the aperture stop STO in one of the states as a reference for this embodiment, and the following examples will not explain this in detail.

[0062] Specifically, taking the optical lens 100 with a focal length f = 6.30 mm, a maximum field of view (FOV) of 81.50 degrees, and an optical total length (TTL) of 7.91 mm as an example, other parameters of the optical lens 100 are given in Table 1 below. The elements along the optical axis O of the optical lens 100 from the object side to the image side are arranged sequentially according to the order of the elements in Table 1 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 2 and 3 correspond to the object side 11 and the image side 12 of the first lens, respectively. The Y-radius in Table 1 is the radius of curvature of the corresponding object side or image side at the optical axis O. The first value in the "thickness" parameter column of the lens is the thickness of the lens along the optical axis O, and the second value is the distance from the image side of the lens to the next surface along 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 11 of the first lens 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 focal length in Table 1 are all mm, and the refractive index and Abbe number in Table 1 are obtained at a reference wavelength of 587.6 nm, and the reference wavelength for the focal length is 555.00 nm.

[0063] Table 2 shows the distance D1 from the aperture stop STO to the object side 11 of the first lens in the direction parallel to the optical axis O, the aperture number FNO, the maximum field of view FOV, and the total optical length TTL of the optical lens 100 in the first aperture state to the third aperture state in the first aperture state. Among them, FNO1 is the first aperture state of the optical lens 100 (i.e., the state with the largest aperture of the optical lens 100), FNO2 is the second aperture state of the optical lens 100 (i.e., the intermediate state of the optical lens 100), and FNO3 is the third aperture state of the optical lens 100 (i.e., the state with the smallest aperture of the optical lens 100).

[0064] In Table 3, k is the conic constant. Table 3 gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical mirror in the first embodiment.

[0065] Table 1

[0066] Table 2

[0067] Table 3

[0068] Please refer to the following: Figure 2 , Figure 4 as well as Figure 6 (A) in the middle Figure 2 , Figure 4 as well as Figure 6 Figure (A) shows longitudinal spherical aberration diagrams of the optical lens 100 in the first embodiment at wavelengths of 650.00 nm, 610.00 nm, 555.00 nm, 510.00 nm, and 470.00 nm, respectively, in the first aperture state, the second aperture state, and the third aperture state. 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. (From 2, ...) Figure 4 as well as Figure 6 As can be seen from (A) in the first aperture state (e.g. Figure 2 ), second aperture state (such as Figure 4 ) and the third aperture state (such as Figure 6 Under the condition that the spherical aberration value of the optical lens 100 in the first embodiment is better, it indicates that the imaging quality of the optical lens 100 in this embodiment is better.

[0069] Please see Figure 2 , Figure 4 as well as Figure 6 (B) Figure 2 , Figure 4 as well as Figure 6 (B) shows the astigmatism diagrams of the optical lens 100 in the first embodiment at a wavelength of 555.00 nm in the first aperture state, second aperture state, and third aperture state, respectively. The horizontal axis along the X-axis represents the focus shift, and the vertical axis along the Y-axis represents the image height, in mm. In the astigmatism diagram, T represents the curvature of the imaging surface 101 in the meridional direction, and S represents the curvature of the imaging surface 101 in the sagittal direction. Figure 2 , Figure 4 as well as Figure 6 As can be seen from (B) in the image, at this wavelength, the first aperture state (such as...) Figure 2 ), second aperture state (such as Figure 4 ) and the third aperture state (such as Figure 6 The astigmatism of the optical lens 100 was well compensated.

[0070] Please see Figure 2 , Figure 4 as well as Figure 6 (C) in Figure 2 , Figure 4 as well as Figure 6 Figure (C) shows the distortion curves of the optical lens 100 in the first embodiment at a wavelength of 555.00 nm in the first aperture state, the second aperture state, and the third aperture state, respectively. The horizontal axis along the X-axis represents distortion, and the vertical axis along the Y-axis represents image height, in mm. Figure 2 , Figure 4 as well as Figure 6 As can be seen from (C) in the diagram, at this wavelength, the first aperture state (such as...) Figure 2 ), second aperture state (such as Figure 4 ) and the third aperture state (such as Figure 6 The distortion of the optical lens 100 was well corrected.

[0071] Second Embodiment The structural schematic diagram of the optical lens 100 disclosed in the second embodiment of this application is shown below. Figure 7 As shown, the optical lens 100 includes an aperture stop STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and an infrared filter 90, arranged sequentially along the optical axis O from the object side to the image side. The materials used are the same as described in the specific embodiments above, and the refractive power and surface shape of the lenses are the same as in the first embodiment, and will not be repeated here.

[0072] Specifically, taking the optical lens 100 with a focal length f = 6.41 mm, a maximum field of view (FOV) of 81.50 degrees, and a total optical length (TTL) of 8.1 mm as an example. Other parameters in this second embodiment are given in Tables 4, 5, and 6 below, and the definitions of each parameter can be derived from the descriptions of the aforementioned embodiments, and will not be repeated here. It is understood that the units for the Y-radius, thickness, and focal length in Table 4 are all mm, and the refractive index and Abbe number in Table 4 are obtained at a reference wavelength of 587.6 nm, while the reference wavelength for the focal length is 555.00 nm.

[0073] Table 4

[0074] Table 5

[0075] Table 6

[0076] Please see Figures 8 to 10 ,Depend on Figures 8 to 10 As can be seen from (A) the longitudinal spherical aberration diagram, (B) the astigmatism diagram, and (C) the distortion curve diagram, in the first aperture state, the second aperture state, and the third aperture state, 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 image quality. Furthermore, regarding... Figures 8 to 10 (A) Figures 8 to 10 (B) and Figures 8 to 10 The wavelengths corresponding to each curve in (C) can be referred to in the first embodiment regarding... Figure 2 , Figure 4 as well as Figure 6 (A) in the middle Figure 2 , Figure 4 And (B) in 6. Figure 2 , Figure 4 as well as Figure 6 The content described in (C) will not be repeated here.

[0077] Third Embodiment The structural schematic diagram of the optical lens 100 disclosed in the third embodiment of this application is shown below. Figure 11As shown, the optical lens 100 includes an aperture stop STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and an infrared filter 90, arranged sequentially along the optical axis O from the object side to the image side. The materials used are as described in the specific embodiments above and will not be repeated here. Further, the object side surface 31 and the image side surface 32 of the third lens are both convex near the optical axis O; the object side surface 41 and the image side surface 42 of the fourth lens are both concave near the optical axis O; and the object side surface 51 and the image side surface 52 of the fifth lens are convex and concave near the optical axis O, respectively. The refractive power and surface shape of the remaining lenses are the same as in the first embodiment and will not be repeated here.

[0078] Specifically, taking the optical lens 100 with a focal length f = 6.40 mm, a maximum field of view (FOV) of 81.60 degrees, and an optical total length (TTL) of 7.9 mm as an example. Other parameters in this third embodiment are given in Tables 7, 8, and 9 below, and the definitions of each parameter can be derived from the descriptions of the foregoing embodiments, and will not be repeated here. It is understood that the units for the Y-radius, thickness, and focal length in Table 7 are all mm, and the refractive index and Abbe number in Table 7 are obtained at a reference wavelength of 587.6 nm, with the reference wavelength for the focal length being 555.00 nm.

[0079] Table 7

[0080] Table 8

[0081] Table 9

[0082] Please see Figures 12 to 14 ,Depend on Figures 12 to 14 As can be seen from (A) the longitudinal spherical aberration diagram, (B) the astigmatism diagram, and (C) the distortion curve diagram, in the first aperture state, the second aperture state, and the third aperture state, 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 image quality. Furthermore, regarding... Figures 12 to 14 (A) Figures 12 to 14 (B) and Figures 12 to 14 The wavelengths corresponding to the curves in (C) can be referred to in the first embodiment regarding... Figure 2 , Figure 4 as well as Figure 6 (A) in the middle Figure 2 , Figure 4 And (B) in 6. Figure 2 , Figure 4 as well as Figure 6 The content described in (C) will not be repeated here.

[0083] Fourth embodiment The structural schematic diagram of the optical lens 100 disclosed in the fourth embodiment of this application is shown below. Figure 15 As shown, the optical lens 100 includes an aperture stop STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and an infrared filter 90, arranged sequentially along the optical axis O from the object side to the image side. The materials of these filters can be found in the specific embodiments described above. Furthermore, the fourth lens L4 has positive refractive power, and the refractive power and surface profile of the remaining lenses are the same as in the first embodiment, and will not be repeated here.

[0084] Specifically, taking the optical lens 100 with a focal length f = 6.53 mm, a maximum field of view (FOV) of 80.40 degrees, and a total optical length (TTL) of 8.3 mm as an example. Other parameters in this fourth embodiment are given in Tables 10, 11, and 12 below, and the definitions of each parameter can be derived from the descriptions of the foregoing embodiments, and will not be repeated here. It is understood that the units for the Y-radius, thickness, and focal length in Table 10 are all mm, and the refractive index and Abbe number in Table 10 are obtained at a reference wavelength of 587.6 nm, with the reference wavelength for the focal length being 555.00 nm.

[0085] Table 10

[0086] Table 11

[0087] Table 12

[0088] Please see Figures 16 to 18 ,Depend on Figures 16 to 18 As can be seen from (A) the longitudinal spherical aberration diagram, (B) the astigmatism diagram, and (C) the distortion curve diagram, in the first aperture state, the second aperture state, and the third aperture state, 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 image quality. Furthermore, regarding... Figures 16 to 18 (A) Figures 16 to 18 (B) and Figures 16 to 18 The wavelengths corresponding to the curves in (C) can be referred to in the first embodiment regarding... Figure 2 , Figure 4 and Figure 6 (A) in the middle Figure 2 , Figure 4 and 6 (B) Figure 2 , Figure 4 and Figure 6 The content described in (C) will not be repeated here.

[0089] Fifth Embodiment The structural schematic diagram of the optical lens 100 disclosed in the fifth embodiment of this application is shown below. Figure 19 As shown, the optical lens 100 includes an aperture stop STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and an infrared filter 90, arranged sequentially along the optical axis O from the object side to the image side. The materials used are as described in the specific embodiments above and will not be repeated here. Further, the image-side surface 12 of the first lens is convex near the optical axis O, the fourth lens L4 has positive refractive power, the fifth lens L5 has negative refractive power, and the object-side surface 51 and image-side surface 52 of the fifth lens are convex and concave near the optical axis O, respectively. The refractive power and surface shape of the remaining lenses are the same as in the first embodiment and will not be repeated here.

[0090] Specifically, taking the optical lens 100 with a focal length f = 6.47 mm, a maximum field of view (FOV) of 80.8 degrees, and an optical total length (TTL) of 8.3 mm as an example. Other parameters in this fifth embodiment are given in Tables 13, 14, and 15 below, and the definitions of each parameter can be derived from the descriptions of the foregoing embodiments, and will not be repeated here. It is understood that the units for the Y-radius, thickness, and focal length in Table 13 are all mm, and the refractive index and Abbe number in Table 13 are obtained at a reference wavelength of 587.6 nm, with the reference wavelength for the focal length being 555.00 nm.

[0091] Table 13

[0092] Table 14

[0093] Table 15

[0094] Please see Figures 20 to 22 ,Depend on Figures 20 to 22 As can be seen from (A) the longitudinal spherical aberration diagram, (B) the astigmatism diagram, and (C) the distortion curve diagram, in the first aperture state, the second aperture state, and the third aperture state, 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 image quality. Furthermore, regarding... Figures 20 to 22 (A) Figures 20 to 22 (B) and Figures 20 to 22 The wavelengths corresponding to the curves in (C) can be referred to in the first embodiment regarding... Figure 2 , Figure 4 and Figure 6 (A) in the middle Figure 2 , Figure 4 and 6 (B) Figure 2 , Figure 4 and Figure 6 The content described in (C) will not be repeated here.

[0095] Please refer to Table 16, which summarizes the ratios of the relationships in the first to fifth embodiments of this application.

[0096] Table 16

[0097] Please see Figure 23 Secondly, this application also discloses a camera module 200, which includes an image sensor 201 and an optical lens 100 as described in any of the first to fifth embodiments of the first aspect above. The image sensor 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 image sensor 201. The image sensor 201 is used to convert the light signal corresponding to the subject into an image signal, which will not be elaborated here. It can be understood that the camera module 200 with the above-described optical lens 100 has the characteristics of variable aperture while satisfying high imaging quality and miniaturization. Since the above-described technical effects have been described in detail in the embodiments of the optical lens 100, they will not be repeated here.

[0098] Please see Figure 24 Thirdly, this application also discloses an electronic device 300, which includes a housing 301 and a camera module 200 as described in the second aspect above, the camera module 200 being disposed in the housing 301. This electronic device 300 can be, but is not limited to, a mobile phone, tablet computer, laptop computer, smartwatch, monitor, dashcam, reversing camera, 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. That is, while satisfying high imaging quality and miniaturization, it has the characteristic of a variable aperture. Since the aforementioned technical effects have been described in detail in the embodiments of the optical lens, they will not be repeated here.

[0099] The terms "first," "second," "third," and various numerical designations used herein are merely for descriptive convenience and are not intended to limit the scope of this application.

[0100] It should be understood that in the various embodiments of this application, the order of the above-mentioned processes does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0101] 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 the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An optical lens, characterized in that, With a variable aperture, the optical system has a total of eight lenses with refractive power, sequentially arranged from the object side to the image side along the optical axis as follows: a first lens with positive refractive power, wherein the object side surface of the first lens is convex at the position near the optical axis; a second lens with negative refractive power, wherein the object side surface of the second lens is convex at the position near the optical axis, and the image side surface of the second lens is concave at the position near the optical axis; a third lens with positive refractive power, wherein the object side surface of the third lens is convex at the position near the optical axis; a fourth lens with refractive power, wherein the image side surface of the fourth lens is concave at the position near the optical axis; a fifth lens with refractive power; a sixth lens with negative refractive power, wherein the object side surface of the sixth lens is convex at the position near the optical axis, and the image side surface of the sixth lens is concave at the position near the optical axis; a seventh lens with positive refractive power, wherein the object side surface of the seventh lens is convex at the position near the optical axis, and the image side surface of the seventh lens is concave at the position near the optical axis; an eighth lens with negative refractive power, wherein the object side surface of the eighth lens is convex at the position near the optical axis, and the image side surface of the eighth lens is concave at the position near the optical axis; The optical lens satisfies the following relational expression: 25deg<FOV / FNO<60deg; 0.5<Yc72 / SD72<0.7; Wherein, Yc72 is the vertical distance from the off-axis critical point on the image side surface of the seventh lens to the optical axis, SD72 is the maximum effective half-aperture of the image side surface of the seventh lens, FOV is the maximum field of view of the optical lens, and FNO is the F-number of the optical lens.

2. The optical lens according to claim 1, characterized in that, The optical lens satisfies the relational expression: 0.6<R81 / f<0.75; and / or, 2<R81 / R82<3; Wherein, R81 is the curvature radius of the object side surface of the eighth lens at the optical axis, R82 is the curvature radius of the image side surface of the eighth lens at the optical axis, and f is the focal length of the optical lens.

3. The optical lens according to claim 1, characterized in that, The optical lens satisfies the relational expression: 5<f8 / SAG81<8; and / or, 8<f8 / SAG82<37; and / or, 2<(SAG81+SAG82) / CT8<4; Wherein, f8 is the focal length of the eighth lens, SAG81 is the distance in the direction parallel to the optical axis from the intersection point of the object side surface of the eighth lens and the optical axis to the position of the maximum effective half-aperture of the object side surface of the eighth lens, SAG82 is the distance in the direction parallel to the optical axis from the intersection point of the image side surface of the eighth lens and the optical axis to the position of the maximum effective half-aperture of the image side surface of the eighth lens, and CT8 is the thickness of the eighth lens on the optical axis.

4. The optical lens according to claim 1, characterized in that, The optical lens satisfies the relational expression: 0.573≤Yc72 / SD72≤0.636; and / or, 0.3<Yc82 / SD82<0.5; Wherein, Yc82 is the vertical distance from the off-axis critical point on the image side surface of the eighth lens to the optical axis, and SD82 is the maximum effective half-aperture of the image side surface of the eighth lens.

5. The optical lens according to claim 1, characterized in that, The optical lens satisfies the relational expression: 1.7<|f2 / f|<2.3; and / or, 2<|f6 / f|<3.5; and / or, 0.9<|f8 / f|<1.3; wherein f is the focal length of the optical lens, f2 is the focal length of the second lens, f6 is the focal length of the sixth lens, and f8 is the focal length of the eighth lens.

6. The optical lens according to claim 1, characterized in that, The optical lens further has a stop, the stop is located on the object side of the first lens, and the optical lens satisfies the relational expression: 1<f1 / f<1.2; and / or, 1<f7 / f<1.2; and / or, 6<f123<9; wherein f is the focal length of the optical lens, f1 is the focal length of the first lens, f7 is the focal length of the seventh lens, and f123 is the combined focal length of the first lens, the second lens and the third lens.

7. The optical lens according to claim 1, characterized in that, The optical lens satisfies the relational expression: 0.8<IMGH / f<0.9; and / or, 0.2mm⁻¹<(IMGH*2) / f / TTL<0.3mm⁻¹; and / or, 0.8<DL / TTL<0.9; wherein IMGH is the radius of the maximum effective imaging circle of the optical lens, f is the focal length of the optical lens, TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the optical lens, and DL is the distance on the optical axis from the object side surface of the first lens to the image side surface of the eighth lens.

8. The optical lens according to claim 1, characterized in that, The optical lens satisfies the relational expression: 0.15<(R61-R62) / (R61+R62)<0.3; and / or, 1.0<(CT1+CT3) / (CT4+CT5)<3.0; wherein R61 is the radius of curvature of the object side surface of the sixth lens at the optical axis, R62 is the radius of curvature of the image side surface of the sixth lens at the optical axis, CT1 is the thickness of the first lens on the optical axis, CT3 is the thickness of the third lens on the optical axis, CT4 is the thickness of the fourth lens on the optical axis, and CT5 is the thickness of the fifth lens on the optical axis.

9. A camera module, characterized in that: The camera module comprises an image sensor and the optical lens according to any one of claims 1 to 8, and the image sensor is arranged on the image side of the optical lens.

10. An electronic device, characterized in that: The electronic device comprises a housing and the camera module according to claim 9, and the camera module is arranged on the housing.

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