Optical lens, camera module and terminal device

Abstract

An optical lens, a camera module and a terminal device, in common, six lenses with refractive power, in turn, comprising: a first lens with negative refractive power, the object side is convex at the near optical axis, the image side is concave at the near optical axis; a second lens with negative refractive power, the object side is concave at the near optical axis, the image side is convex at the near optical axis; a third lens with positive refractive power, the object side and the image side are both convex at the near optical axis; a fourth lens with positive refractive power, the object side and the image side are both convex at the near optical axis; a fifth lens with negative refractive power, the object side and the image side are both concave at the near optical axis; a sixth lens with positive refractive power, the object side and the image side are both convex at the near optical axis; the optical lens satisfies the following relationship: 118°<=FOV<=130°, 6<=TTL / IMGH<=8. The optical lens of the application can realize the miniaturization design of the optical lens, at the same time, make the optical lens have the characteristics of large field of view, and improve the imaging quality of the optical lens.

Description

Technical Field

[0001] This application relates to the field of optical imaging technology, specifically to an optical lens, a camera module, and a terminal device. Background Technology

[0002] With the rapid development of automotive intelligence and autonomous driving technology, optical lenses, as the core component of vehicle vision systems, play an irreplaceable role in scenarios such as reversing vision, driving recording, automatic parking assistance, panoramic surround view, and road recognition. Especially in advanced driver assistance systems (ADAS), forward-looking optical lenses need to complete key functions such as environmental perception, obstacle detection, and path planning, and their optical performance directly affects the reliability of the system and driving safety. However, existing vehicle optical lenses still have the following defects: (1) large size, resulting in limited installation space and low integration; (2) insufficient field of view, significantly reduced edge imaging resolution, and difficulty in covering blind spots around the vehicle; (3) deterioration of imaging quality in low-light or high dynamic range scenarios, failing to meet the stringent requirements of intelligent driving systems for wide field of view, high definition, and all-weather imaging. Summary of the Invention

[0003] In view of the above, it is necessary to propose an optical lens, a camera module and a terminal device to achieve miniaturization of the optical lens, while also enabling the optical lens to have a large field of view and improve the imaging quality of the optical lens.

[0004] To achieve the above objectives, in a first aspect, this application discloses an optical lens comprising six refractive lenses, arranged sequentially along the optical axis from the object side to the image side: a first lens having negative refractive power, with the object side being convex near the optical axis and the image side being concave near the optical axis; a second lens having negative refractive power, with the object side being concave near the optical axis and the image side being convex near the optical axis; a third lens having positive refractive power, with both the object side and image side being convex near the optical axis; and a fourth lens having positive refractive power, with both the object side and image side being convex near the optical axis. The first lens has a convex surface; the fifth lens has negative refractive power, and both the object-side and image-side surfaces are concave near the optical axis; the sixth lens has positive refractive power, and both the object-side and image-side surfaces are convex near the optical axis; the optical lenses satisfy the following relationships: 118°≤FOV≤130°, 6≤TTL / IMGH≤8; where FOV is the maximum field of view of the optical lens, 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 IMGH is the radius of the largest effective imaging circle on the imaging surface of the optical lens.

[0005] In the optical lens provided in this application embodiment, the first lens has negative refractive power, the object-side surface is convex near the optical axis, and the image-side surface is concave near the optical axis. The convex surface is a meniscus shape facing the object side, which can effectively collect incident light rays with a large field of view and expand the field of view of the optical lens. The second lens has negative refractive power, the object-side surface is concave near the optical axis, and the image-side surface is convex near the optical axis. It can initially correct the astigmatism of the optical lens, and further control the direction of light rays, reduce the difficulty of aberration correction of subsequent lenses, and improve the imaging quality of the optical lens. The third lens has positive refractive power, and both the object-side and image-side surfaces of the third lens are convex near the optical axis. This is conducive to the rational distribution of the refractive power of the optical lens, so that the overall refractive power of the optical lens moves less towards the object side, which helps to shorten the total optical length of the optical lens and achieve the design requirement of miniaturization. The fourth lens has positive refractive power, with both the object-side and image-side surfaces convex near the optical axis. This allows it to converge light rays, reduce their height, and smooth their transition. The fifth lens has negative refractive power, with both the object-side and image-side surfaces concave near the optical axis. The sixth lens has positive refractive power, with both the object-side and image-side surfaces convex near the optical axis. The fifth and sixth lenses can adjust the light rays passing through the central and peripheral fields of view of the fourth lens, increasing the proportion of the peripheral field of view in the image and enhancing the sharpness of the peripheral field of view. They also help correct chromatic aberration and balance various aberrations, improving resolving power and effectively reducing tolerance sensitivity, thus enhancing the image quality of the optical lens.

[0006] When 118°≤FOV≤130°, the optical lens has a large field of view, which is beneficial for the optical lens to capture more scene content and thus enrich the imaging information of the optical lens. When 6≤TTL / IMGH≤8, the ratio of the distance from the object side of the first lens to the imaging plane of the optical lens on the optical axis to half of the image height corresponding to the maximum field of view of the optical lens can be reasonably configured, which is beneficial to improving the resolution of the optical lens in the entire field of view and improving the imaging quality of the edge field of view; at the same time, it is also beneficial to have a smaller overall optical length of the optical lens, realizing the miniaturization characteristic.

[0007] 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.

[0008] 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

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

[0010] 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.

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

[0012] 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.

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

[0014] 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.

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

[0016] 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.

[0017] Figure 9 This is a schematic diagram of the structure of the optical lens disclosed in the fifth embodiment of this application.

[0018] 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.

[0019] Figure 11 This is a schematic diagram of the camera module disclosed in this application.

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

[0021] Explanation of key component symbols: Optical lens 100, optical axis O, first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, object side surface S1, S3, S5, S7, S9, S11, image side surface S2, S4, S6, S8, S10, S12, aperture STO, filter IR, protective glass CG, imaging surface IMG, camera module 200, photosensitive chip 201, terminal device 300, housing 301. Detailed Implementation

[0022] 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.

[0023] Firstly, please refer to Figure 1 This application discloses an optical lens 100 comprising six lenses with refractive power, arranged sequentially from the object side to the image side along the optical axis O as a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6. During imaging, light rays enter sequentially from the object side of the first lens L1 through the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6, and are ultimately imaged onto the imaging plane IMG of the optical lens 100.

[0024] Furthermore, the first lens L1 has negative refractive power, its object-side surface S1 is convex near the optical axis O, and its image-side surface S2 is concave near the optical axis O. The second lens L2 has negative refractive power, its object-side surface S3 is concave near the optical axis O, and its image-side surface S4 is convex near the optical axis O. The third lens L3 has positive refractive power, and both its object-side surface S5 and image-side surface S6 are convex near the optical axis O. The fourth lens L4 has positive refractive power, and both its object-side surface S7 and image-side surface S8 are convex near the optical axis O. The fifth lens L5 has negative refractive power, and both its object-side surface S9 and image-side surface S10 are concave near the optical axis O. The sixth lens L6 has positive refractive power, and both its object-side surface S11 and image-side surface S12 are convex near the optical axis O.

[0025] In the optical lens 100 provided in this embodiment, the first lens L1 has negative refractive power, the object-side surface S1 is convex near the optical axis O, and the image-side surface S2 is concave near the optical axis O. The convex surface is a meniscus shape facing the object side, which can effectively collect incident light rays with a large field of view and expand the field of view of the optical lens 100. The second lens L2 has negative refractive power, the object-side surface S3 is concave near the optical axis O, and the image-side surface S4 is convex near the optical axis O. It can initially correct the astigmatism of the optical lens 100, and further control the direction of light rays, reduce the difficulty of aberration correction of subsequent lenses, and improve the imaging quality of the optical lens 100. The third lens L3 has positive refractive power. Both the object-side surface S5 and the image-side surface S6 are convex near the optical axis O, which helps to rationally distribute the refractive power of the optical lens 100, reducing the overall refractive power shift towards the object side and helping to shorten the overall optical length of the optical lens 100, thus meeting the design requirements of miniaturization. The fourth lens L4 has positive refractive power. Both the object-side surface S7 and the image-side surface S8 are convex near the optical axis O, which can converge light rays and reduce their height while reducing the tendency of light rays to bend, resulting in a smooth transition. The fifth lens L5 has... The fifth lens L5 and the sixth lens L6 have negative refractive power, and both the object-side surface S9 and the image-side surface S10 are concave near the optical axis O. The sixth lens L6 has positive refractive power, and both the object-side surface S11 and the image-side surface S12 are convex near the optical axis O. The fifth lens L5 and the sixth lens L6 can adjust the light rays passing through the central field of view and the edge field of view of the fourth lens L4, increase the proportion of the edge field of view in the image, and enhance the image clarity of the edge field of view. At the same time, it is beneficial to correct chromatic aberration and balance various aberrations, improve resolution, and effectively reduce tolerance sensitivity, thereby improving the image quality of the optical lens 100.

[0026] In some embodiments, when the optical lens 100 is applied to electronic devices such as in-vehicle devices, dashcams, or automobiles, the first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, and sixth lens L6 can all be made of glass. This allows the optical lens 100 to have good optical performance while reducing the impact of temperature on the lenses. Of course, some lenses in the optical lens 100 can be made of glass, while others can be made of plastic. This ensures that the impact of temperature on the lenses is reduced to achieve better imaging results, while also reducing the processing cost and weight of the lenses, thereby reducing the overall weight of the optical lens 100. Furthermore, it is understood that when the optical lens 100 is applied to electronic devices such as smartphones and tablets, the first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, and sixth lens L6 can be made of plastic to reduce the overall weight of the optical lens 100.

[0027] In some embodiments, considering that spherical lenses have the advantages of simple manufacturing process and low production cost, and can facilitate flexible design of lens surface shape, thereby improving the imaging resolution of optical lens 100. Aspherical lenses allow for more flexible design of the object-side or image-side of the lens, enabling the lens to effectively solve problems such as unclear imaging, distorted field of view, or narrow field of view even when the lens is small and thin. Moreover, optical lens 100 does not need to set too many lenses to achieve good imaging quality, which is beneficial for shortening the length of optical lens 100. Based on this, the second lens L2 and the fifth lens L5 can be spherical lenses, while the first lens L1 and the sixth lens L6 are aspherical lenses. In this way, the combination of spherical and aspherical lenses not only improves the manufacturability of each lens and facilitates surface shape design, but also allows for more flexible design of the object-side or image-side of the lens. This enables each lens to effectively solve problems such as unclear imaging, distorted field of view, or narrow field of view even when the lens is small and thin. Moreover, optical lens 100 does not need to set too many lenses to achieve good imaging quality, which is beneficial for shortening the length of optical lens 100. It is understood that in other embodiments, the surfaces of each lens in the optical lens 100 may be spherical, aspherical, or any combination of spherical and aspherical surfaces. The specific selection can be made according to actual needs, so no specific limitation is made in this embodiment.

[0028] 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 between the image-side surface S4 of the second lens L2 and the object-side surface S5 of the third lens L3, 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.

[0029] In some embodiments, the optical lens 100 further includes an infrared filter IR, which is disposed between the sixth lens L6 and the imaging surface IMG of the optical lens 100. In this embodiment, the infrared cutoff filter IR can be selected, thereby filtering out light of other wavelengths such as infrared light, while allowing only visible light to pass through, making the image more in line with the visual experience of the human eye. Of course, the infrared bandpass filter IR can also be selected, thereby filtering out light of other wavelengths such as visible light, while allowing only infrared light to pass through. By filtering out light of other wavelengths such as visible light, the image quality is improved; and the optical lens 100 can be used as an infrared optical lens, that is, the optical lens 100 can also image and obtain good image effects in dim environments and other special application scenarios. The infrared filter IR can also be selected as a dual-pass filter, which can simultaneously transmit high levels of visible light and transmit some infrared light, thereby achieving different wavelength selection, enabling both visible light imaging and infrared imaging, thus achieving day and night usability. It is understood that the filter IR can be made of glass, optical glass with a coating, or other materials. The choice can be made according to actual needs, and no specific limitation is made in this embodiment.

[0030] In some embodiments, the optical lens 100 further includes a protective glass CG, which is disposed between the filter IR and the imaging surface IMG of the optical lens 100, thereby protecting the photosensitive chip from dust. The protective glass CG can be made of plastic, optical glass with a coating, or other materials, and can be selected according to actual needs; no specific limitation is made in this embodiment. It is understood that the protective glass CG can be part of the optical lens 100 or can be removed from the optical lens 100, but when the protective glass CG is removed, the total optical length of the optical lens 100 remains unchanged.

[0031] In some embodiments, the optical lens 100 satisfies the relationship: 118° ≤ FOV ≤ 130°. Here, FOV is the maximum field of view of the optical lens 100. Specifically, FOV can be 119°, 120°, 123°, 126°, or 129°, etc. When the optical lens 100 satisfies the above relationship, the optical lens 100 has a large field of view, which is beneficial for the optical lens 100 to acquire more scene content, thereby enriching the imaging information of the optical lens 100.

[0032] In some embodiments, the optical lens 100 satisfies the relationship: 6 ≤ TTL / IMGH ≤ 8. Here, 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 along 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, 6.2, 6.4, 6.9, 7.2, 7.4, 7.9, or 8, etc. When the optical lens 100 satisfies the above relationship, 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 along the optical axis O to half the image height corresponding to the maximum field of view of the optical lens 100 can be reasonably configured. This is beneficial for improving the resolution of the optical lens 100 across the entire field of view and improving the imaging quality at the edges of the field of view; at the same time, it also helps the optical lens 100 to have a smaller overall optical length, achieving miniaturization. Furthermore, when 6.5≤TTL / IMGH≤7.8, the imaging quality of the optical lens 100 can be improved.

[0033] In some embodiments, the optical lens 100 satisfies the relationship: 1.1 ≤ F / IMGH ≤ 1.3. Here, 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 plane IMG of the optical lens 100. Specifically, F / IMGH can be 1.1, 1.15, 1.2, 1.25, or 1.3, etc. When the optical lens 100 satisfies the above relationship, it can effectively correct the distortion generated by the optical lens 100, thereby reducing the manufacturing difficulty of the optical lens 100 while improving its imaging quality. Furthermore, it helps to control the focal length of the optical lens 100 within a reasonable range and ensures that the optical lens 100 has sufficient light-gathering area and a sufficient field of view, thus simultaneously satisfying the characteristics of a large field of view and a large image plane.

[0034] In some embodiments, the optical lens 100 satisfies the relationship: 1.7 ≤ FNO ≤ 2. Here, FNO is the aperture number of the optical lens 100. Specifically, FNO can be 1.7, 1.75, 1.82, 1.85, or 1.99, etc. When the optical lens 100 satisfies the above relationship, it possesses the characteristic of a large aperture, allowing sufficient light intake and resulting in clearer images. This makes it suitable for capturing high-quality night scenes, starry skies, and other low-light object space scenes. Furthermore, it avoids introducing excessive aberrations, achieving overall balance for the optical lens 100.

[0035] In some embodiments, the optical lens 100 satisfies the relationship: 0.65 ≤ BFL / F ≤ 0.9. Here, BFL is the distance on the optical axis O from the image-side surface S12 of the sixth lens L6 to the imaging surface IMG of the optical lens 100, and F is the effective focal length of the optical lens 100. Specifically, BFL / F can be 0.65, 0.7, 0.8, 0.85, or 0.9, etc. By controlling the ratio of the back focal length to the focal length of the optical lens 100, it is beneficial to reasonably control the back focal length and ensure the matching between the lens group and the image sensor. When the optical lens 100 exceeds the upper limit of the above relationship, the back focal length of the optical lens 100 is too long, which is not conducive to achieving a large image plane effect; when the optical lens 100 is below the lower limit of the above relationship, the focal length of the optical lens 100 is too large, which is not conducive to achieving the large field of view required by the optical lens 100.

[0036] In some embodiments, the optical lens 100 satisfies the relationship: 0.7 ≤ CT2 / CT3 ≤ 0.98. Here, CT2 is the thickness of the second lens L2 along the optical axis O, and CT3 is the thickness of the third lens L3 along the optical axis O. Specifically, CT2 / CT3 can be 0.7, 0.75, 0.85, 0.95, or 0.98, etc. By ensuring the optical lens 100 satisfies the above relationship, it is beneficial to have a thinner second lens L2 along the optical axis O, making it a key lens for correcting edge field-of-view distortion and improving imaging performance. Controlling the ratio of the thickness of the second lens L2 to the thickness of the third lens L3 along the optical axis O within a reasonable range helps to effectively balance the optical path difference of the optical lens 100, reduce the size of the optical lens 100, and maintain the ultra-thin characteristic of the third lens L3.

[0037] In some embodiments, the optical lens 100 satisfies the relationship: -0.5 ≤ R5 / R6 ≤ -0.3. Here, R5 is the radius of curvature of the object-side surface S5 of the third lens L3 at the optical axis O, and R6 is the radius of curvature of the image-side surface S6 of the third lens L3 at the optical axis O. Specifically, R5 / R6 can be -0.5, -0.45, -0.4, -0.35, or -0.3, etc. When the optical lens 100 satisfies the above relationship, it can optimize the radius of curvature and surface shape of the object-side surface S5 and image-side surface S6 of the third lens L3. This facilitates the proper coordination of the third lens L3 with the negative refractive power of the first lens L1 and the second lens L2, thereby reducing the on-axis spherical aberration of the entire optical lens 100. Simultaneously, it helps to correct the optical path from the third lens L3 to the fourth lens L4, thus reducing optical distortion.

[0038] In some embodiments, the optical lens 100 satisfies the relationship: 1.8 ≤ F3 / F ≤ 2.3. Here, 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 1.8, 1.9, 2.0, 2.15, or 2.3, etc. By limiting the relationship between the focal length of the third lens L3 and the effective focal length of the optical lens 100, the edge field-of-view aberration of the optical lens 100 can be corrected, the imaging resolution of the optical lens 100 can be improved, and thus the imaging quality of the optical lens 100 can be enhanced.

[0039] In some embodiments, the optical lens 100 satisfies the relationship: 1 ≤ SD1 / IMGH ≤ 1.2. Here, SD1 is half 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 plane IMG of the optical lens 100. Specifically, SD1 / IMGH can be 1, 1.05, 1.1, 1.15, or 1.2, etc. When the optical lens 100 satisfies the above relationship, the optical lens 100 has sufficient light intake, enabling the maximum effective half-aperture of the object-side surface S1 of the first lens L1 to be larger than the size of the imaging plane IMG, thereby achieving large image plane imaging while controlling the head aperture of the optical lens 100.

[0040] In some embodiments, the optical lens 100 satisfies the relationship: 1.5 ≤ SD1 / SD3 ≤ 1.7. Wherein, SD1 is half the maximum effective aperture of the object-side surface S1 of the first lens L1, and SD3 is half the maximum effective aperture of the object-side surface S3 of the second lens L2. Specifically, SD1 / SD3 can be 1.5, 1.55, 1.6, 1.65, or 1.7, etc. When the optical lens 100 satisfies the above relationship, the second lens L2 can have a small aperture characteristic, effectively converging the light rays from the first lens L1, allowing the light to enter the imaging surface of the optical lens 100 better.

[0041] In some embodiments, the optical lens 100 satisfies the relationship: 0.14 ≤ SD1 / TTL ≤ 0.17. Here, SD1 is half the maximum effective aperture of the object-side surface S1 of the first lens L1, 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 along the optical axis O. Specifically, SD1 / TTL can be 0.14, 0.145, 0.15, 0.16, or 0.17, etc. By controlling the relationship between the maximum effective half-aperture of the object-side surface S1 of the first lens L1 and the total length of the optical lens 100, it is possible to ensure that the first lens L1 has a sufficient and suitable aperture size. This allows for a small head design of the optical lens 100 while ensuring image quality and collecting large-angle light. In other words, satisfying the above relationship helps to reduce the head size and total length of the optical lens 100, achieving a balance between image quality and miniaturization.

[0042] In some embodiments, the optical lens 100 satisfies the relationship: F45 / F ≥ 8. Here, F45 is the combined effective focal length of the fourth lens L4 and the fifth lens L5, and F is the effective focal length of the optical lens 100. Specifically, F45 / F can be 8, 50, 100, 200, or 300, etc. By limiting the range of the ratio of the combined focal length of the fourth lens L4 and the fifth lens L5 to the effective focal length of the optical lens 100, the refractive power of the optical lens 100 is reasonably allocated. This helps reduce the assembly sensitivity of the optical lens 100, solves the manufacturing and assembly problems of the fourth lens L4 and the fifth lens L5, improves the yield, and also helps reduce eccentricity sensitivity, correct system aberrations, improve imaging resolution, and achieve better imaging results.

[0043] In some embodiments, the optical lens 100 satisfies the relationship: 0 < (Vd4 - Vd5) / F45 ≤ 1. Where Vd4 is the Abbe number of the fourth lens L4, Vd5 is the Abbe number of the fifth lens L5, and F45 is the combined effective focal length of the fourth lens L4 and the fifth lens L5. Specifically,

[0044] (Vd4-Vd5) / F45 can be 0.01, 0.3, 0.5, 0.7, or 1, etc. By reasonably setting the ratio of the Abbe number difference between the fourth lens L4 and the fifth lens L5 to the effective focal length of the combination of the fourth lens L4 and the fifth lens L5, the chromatic aberration of the optical lens 100 can be effectively corrected, the authenticity of colors can be restored, and the image quality can be improved.

[0045] In some embodiments, the optical lens 100 satisfies the relationship: 1.7 ≤ CT4 / CT5 ≤ 5.1. Here, CT4 is the thickness of the fourth lens L4 along the optical axis O, and CT5 is the thickness of the fifth lens L5 along the optical axis O. Specifically, CT4 / CT5 can be 1.7, 2, 3, 4, or 5.1, etc. By ensuring the optical lens 100 satisfies the above relationship, it is beneficial to have a thinner fifth lens L5 along the optical axis O, making it a key lens for correcting edge field distortion and improving imaging performance. Maintaining the ratio of the thickness of the fourth lens L4 to the fifth lens L5 along the optical axis O within a reasonable range helps to effectively balance the optical path difference of the optical lens 100, reduce the size of the optical lens 100, and maintain the ultra-thin characteristics of the fifth lens L5.

[0046] In some embodiments, the optical lens 100 satisfies the relationship: 1.7 ≤ R1 / R2 ≤ 2.1. Here, R1 is the radius of curvature of the object-side surface S1 of the first lens L1 at the optical axis O, and R2 is the radius of curvature of the image-side surface S2 of the first lens L1 at the optical axis O. Specifically, R1 / R2 can be 1.7, 1.8, 1.9, 2.0, or 2.1, etc. When the optical lens 100 satisfies the above relationship, it is beneficial to control the shape and curvature of the first lens L1, thereby effectively reducing the aberration introduced by the incident light, promoting aberration balance in the optical lens 100, and also reducing the processing difficulty of the first lens L1, thus facilitating its manufacturing and improving the manufacturability of the optical lens 100.

[0047] In some embodiments, the optical lens 100 satisfies the relationship: -0.5 ≤ R9 / R10 ≤ -0.2. Here, R9 is the radius of curvature of the object-side surface S9 of the fifth lens L5 at the optical axis O, and R10 is the radius of curvature of the image-side surface S10 of the fifth lens L5 at the optical axis O. Specifically, R9 / R10 can be -0.5, -0.45, -0.35, -0.25, or -0.2, etc. When the optical lens 100 satisfies the above condition, the surface shape of the fifth lens L5 can be reasonably controlled, effectively controlling the astigmatism contribution of the fifth lens L5, ensuring the imaging quality of the intermediate field of view, which is beneficial for correcting the aberrations of the optical lens 100, ensuring the balance of the distortion of the optical lens 100, and at the same time, avoiding excessive curvature of the object-side surface S9 and image-side surface S10 of the fifth lens L5 at the optical axis O, which helps reduce the processing difficulty of the fifth lens L5 and improve the yield rate of the fifth lens L5.

[0048] In some embodiments, the optical lens 100 satisfies the relationship: -20 ≤ R12 / R11 ≤ -1. Here, R11 is the radius of curvature of the object-side surface S11 of the sixth lens L6 at the optical axis O, and R12 is the radius of curvature of the image-side surface S12 of the sixth lens L6 at the optical axis O. Specifically, R12 / R11 can be -20, -15, -10, -6, or -1, etc. When the optical lens 100 satisfies the above relationship, it is beneficial to control the shape and curvature of the sixth lens L6, thereby effectively reducing the aberration introduced by the incident light, promoting aberration balance in the optical lens 100, and also reducing the processing difficulty of the sixth lens L6, thus facilitating its manufacturing and improving the manufacturability of the optical lens 100.

[0049] In some embodiments, the optical lens 100 satisfies the relationship: 1.2 ≤ CT6 / ET6 ≤ 1.8. Here, CT6 is the thickness of the sixth lens L6 along the optical axis O, and ET6 is the distance from the maximum effective aperture of the object-side surface S11 of the sixth lens L6 to the maximum effective aperture of the image-side surface S12 of the sixth lens L6 along the optical axis O. Specifically, CT6 / ET6 can be 1.2, 1.35, 1.5, 1.65, or 1.8, etc. When the optical lens 100 satisfies the above relationship, the edge thickness and center thickness of the sixth lens L6 are within a reasonable range, the surface shape change of the sixth lens L6 is small, which can effectively control the aberrations present in the optical lens 100, and also facilitates manufacturing processes and improves production yield.

[0050] In some embodiments, the optical lens 100 satisfies the relationship: 3.8 ≤ ∑CT / ∑AT ≤ 5.8. Here, ∑CT is the sum of the thicknesses of all lenses from the first lens L1 to the sixth lens L6 along the optical axis O, and ∑AT is the sum of the air gaps between adjacent lenses from the first lens L1 to the sixth lens L6. Specifically, ∑CT / ∑AT can be 3.8, 4.2, 4.8, 5.2, or 5.8, etc. Satisfying the above relationship allows for a reasonable configuration of air gaps, effectively shortening the step difference between the lenses of the optical lens 100, and facilitating the support design of the lenses, thus improving the assembly yield of the optical lens 100. If the upper limit of the relationship is exceeded, the lenses are too close together, easily leading to collisions; if the lower limit is below the relationship, the gaps between the lenses are too large, which is detrimental to lens assembly.

[0051] In some embodiments, the optical lens 100 satisfies the relationship: 1 ≤ R3 / (R4+CT2) ≤ 1.3. Here, R3 is the radius of curvature of the object-side surface S3 of the second lens L2 at the optical axis O, R4 is the radius of curvature of the image-side surface S4 of the second lens L2 at the optical axis O, and CT2 is the thickness of the second lens L2 along the optical axis O. Specifically, R3 / (R4+CT2) can be 1, 1.12, 1.2, 1.25, or 1.3, etc. When the optical lens 100 satisfies the above condition, it is beneficial to control the radius of curvature of the object-side surface S3 and the image-side surface S4 of the second lens L2, reducing ghosting; the center thickness of the second lens L2 can be controlled, ensuring high-pixel imaging quality while maintaining a compact imaging system structure.

[0052] In some embodiments, the optical lens 100 satisfies the relationship: 5 ≤ TTL / F ≤ 6.7. Here, TTL is the distance along the optical axis O from the object-side surface S1 of the first lens L1 to the imaging surface IMG of the optical lens 100, and F is the effective focal length of the optical lens 100. Specifically, TTL / F can be 5, 5.4, 6, 6.3, or 6.7, etc. By satisfying the above relationship and rationally configuring the total optical length and focal length of the optical lens 100, the field of view range of the optical lens 100 can be satisfied while the total optical length of the optical lens 100 can be reasonably controlled, and the miniaturization characteristic of the optical lens 100 can also be met.

[0053] In some embodiments, the optical lens 100 satisfies the relationship: 64° ≤ FOV / FNO ≤ 71°. Here, FOV is the maximum field of view of the optical lens 100, and FNO is the aperture number of the optical lens 100. Specifically, FOV / FNO can be 64°, 66°, 68°, 70°, or 71°, etc. When the optical lens 100 satisfies the above relationship, the field of view and light transmission of the optical lens 100 can be reasonably controlled, distortion at the edges of the field of view can be improved, and excessive light transmission of the optical lens 100 can be prevented. If the field of view of the optical lens 100 is too large when it exceeds the upper limit of the above relationship, it will cause excessive distortion at the edge of the field of view, resulting in distortion at the periphery of the image. In addition, it will also cause the aperture number to be too small, resulting in excessive light transmission of the optical lens 100. This will cause non-effective light rays to also reach the imaging plane IMG, resulting in aberrations such as spherical aberration and field curvature in the image (especially at the edge of the field of view), which will lead to a decrease in the imaging performance of the optical lens 100. If the field of view is below the lower limit of the above relationship, the aperture number of the optical lens 100 will be relatively large, resulting in insufficient light transmission of the optical lens 100 and a decrease in the sharpness of the captured image.

[0054] In some embodiments, the optical lens 100 satisfies the relationship: 140° ≤ FOV*F / IMGH ≤ 162°. Here, FOV is the maximum field of view of the optical lens 100, 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 plane IMG of the optical lens 100. Specifically, FOV*F / IMGH can be 140°, 145°, 150°, 155°, or 162°, etc. When the optical lens 100 satisfies the above relationship, it not only achieves a large field of view but also helps to ensure the image height of the optical lens 100, ensuring the image plane size on the imaging plane IMG, thus giving the optical lens 100 a suitable image plane size and improving the brightness of the imaging plane IMG of the optical lens 100. When the image height exceeds the upper limit of the conditional expression, the image height of the optical lens 100 is relatively small, resulting in an image with an excessively small imaging size. This makes it difficult for the imaging surface IMG of the optical lens 100 to match the settings of the image sensor, causing a significant decrease in the relative illuminance of the imaging surface IMG. Consequently, the brightness of the imaging surface IMG is relatively dark, and the captured image is prone to vignetting, thus reducing image quality. When the image height is below the lower limit of the conditional expression, the field of view of the optical lens 100 is relatively small, resulting in a reduced field of view for the optical lens 100, which is not conducive to achieving wide-angle imaging.

[0055] In some embodiments, the optical lens 100 satisfies the relationship: 15.5° ≤ FOV * IMGH / TTL ≤ 18.9°. Here, TTL is the distance on the optical axis O from the object-side surface S1 of the first lens L1 to the imaging surface IMG of the optical lens 100; IMGH is the radius of the largest effective imaging circle on the imaging surface IMG of the optical lens 100; and FOV is the maximum field of view of the optical lens 100. Specifically, TTL / (IMGH * FOV) can be 15.5°, 16°, 17°, 18°, 18.5°, or 18.9°, etc. When the optical lens 100 satisfies the above relationship, by reasonably controlling the total optical length, image height, and field of view of the optical lens 100, a larger image height and field of view can be obtained while further shortening the total optical length.

[0056] In some embodiments, the optical lens 100 satisfies the relationship: -2 ≤ F1 / F ≤ -1.7. Here, 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 -2, -1.8, -1.8, -1.75, or -1.7, etc. When the optical lens 100 satisfies the above relationship, the ratio of the focal length of the first lens L1 to the focal length of the optical lens 100 can be reasonably configured. For the entire optical lens 100, the refractive power of the first lens L1 will not be too strong, avoiding the introduction of excessive spherical aberration, thus enabling the optical lens 100 to have good imaging quality.

[0057] In some embodiments, the optical lens 100 satisfies the relationship: -15 ≤ F2 / F ≤ -7. Here, 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 -15, -13, -11, -9, or -7, etc. When the optical lens 100 satisfies the above relationship, it helps to reduce the refractive angle of light from the second lens L2, and simultaneously allows the negative refractive force provided by the second lens L2 to effectively balance the spherical aberration of the optical lens 100, effectively correcting aberrations and thus achieving good image quality. It also facilitates the rational configuration of the center thickness of the second lens L2, thereby shortening the overall length of the optical lens 100, and further helps to expand the field of view of the optical lens 100.

[0058] In some embodiments, the optical lens 100 satisfies the relationship: 1.3 ≤ F4 / F ≤ 1.5. Here, F4 is the effective focal length of the fourth lens L4, and F is the effective focal length of the optical lens 100. Specifically, F4 / F can be 1.3, 1.35, 1.4, 1.45, or 1.5, etc. When the optical lens 100 satisfies the above relationship, the fourth lens L4 provides a portion of the positive refractive power to the optical lens 100, which can be used to adjust the overall refractive power of the optical lens 100. The fourth lens L4, together with the first lens L1, the second lens L2, and the third lens L3, forms a Gaussian-like structure, which can balance the distortion generated by the first lens L1, the second lens L2, and the third lens L3, avoiding excessive refractive index and causing higher-order aberrations, thereby improving the imaging quality of the optical lens 100.

[0059] In some embodiments, the optical lens 100 satisfies the relationship: -1.3 ≤ F5 / F ≤ -1.1. Here, 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 -1.3, -1.25, -1.2, -1.15, or -1.1, etc. When the optical lens 100 satisfies the above relationship, the exit angle of light after being refracted by the lens group can be reduced, thereby reducing the incident angle of light entering the photosensitive chip on the image side of the optical lens 100, and thus improving the light-sensing performance of the photosensitive chip.

[0060] In some embodiments, the optical lens 100 satisfies the relationship: 2.5 ≤ F6 / F ≤ 4.3. Here, 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 2.5, 3.0, 3.5, 4, or 4.3, etc. By limiting the relationship between the focal length of the sixth lens L6 and the effective focal length of the optical lens 100 as described above, it is helpful to correct the aberrations of the optical lens 100, and at the same time, it can reduce the temperature sensitivity of the optical lens 100, thereby improving the imaging quality of the optical lens 100.

[0061] In some embodiments, the optical lens 100 satisfies the relationship: 0.5 ≤ R3 / R4 ≤ 0.7. Here, R3 is the radius of curvature of the object-side surface S3 of the second lens L2 at the optical axis O, and R4 is the radius of curvature of the image-side surface S4 of the second lens L2 at the optical axis O. Specifically, R3 / R4 can be 0.5, 0.55, 0.6, 0.65, or 0.7, etc. When the optical lens 100 satisfies the above relationship, 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. Simultaneously, the sensitivity of the second lens L2 can be reduced, minimizing the influence of field curvature during focusing at different object distances and improving image quality.

[0062] In some embodiments, the optical lens 100 satisfies the relationship: -1 ≤ R7 / R8 ≤ -0.7. Here, R7 is the radius of curvature of the object-side surface S7 of the fourth lens L4 at the optical axis O, and R8 is the radius of curvature of the image-side surface S8 of the fourth lens L4 at the optical axis O. Specifically, R7 / R8 can be -0.99, -0.85, -0.8, -0.75, or -0.7, etc. When the optical lens 100 satisfies the above relationship, it helps to correct the aberrations generated by the optical lens 100, making the refractive forces of each lens in the direction perpendicular to the optical axis O uniform, significantly correcting the distortion and aberrations generated by the front lens, while avoiding excessive bending of the fourth lens L4, and facilitating its molding and manufacturing.

[0063] The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formulas:

[0064]

[0065] 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.

[0066] The optical lens 100 of this embodiment will be described in detail below with reference to specific parameters.

[0067] First Embodiment

[0068] 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, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter IR, and a protective glass CG arranged sequentially along the optical axis O from the object side to the image side.

[0069] The first lens L1 has negative refractive power. Its object-side surface S1 is convex near the optical axis O, and its image-side surface S2 is concave near the optical axis O. The second lens L2 also has negative refractive power. Its object-side surface S3 is concave near the optical axis O, and its image-side surface S4 is convex near the optical axis O. The third lens L3 has positive refractive power. Both its object-side surface S5 and image-side surface S6 are convex near the optical axis O. The fourth lens L4 has positive refractive power. Both its object-side surface S7 and image-side surface S8 are convex near the optical axis O. The fifth lens L5 has negative refractive power. Both its object-side surface S9 and image-side surface S10 are concave near the optical axis O. The sixth lens L6 has positive refractive power. Both its object-side surface S11 and image-side surface S12 are convex near the optical axis O.

[0070] 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 558 nm.

[0071] In the first embodiment, the object-side surface and image-side surface of the first lens L1 and the object-side surface and image-side surface of the sixth lens L6 are both aspherical. Table 1b gives the conic constant k and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical mirror surface in the first embodiment.

[0072] Table 1a

[0073]

[0074] Table 1b

[0075]

[0076] 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 661 nm, 614 nm, 558 nm, 502 nm, and 455 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.

[0077] 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 558 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.

[0078] 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 558 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.

[0079] Second Embodiment

[0080] 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, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter IR, and a protective glass CG arranged sequentially along the optical axis O from the object side to the image side.

[0081] 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.

[0082] 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. It is understood that the units for Y-radius, thickness, and effective focal length in Table 2a are all mm. Furthermore, the reference wavelength for the refractive index and Abbe number of each lens in Table 2a is 587.56 nm, and the reference wavelength for the effective focal length is 558 nm.

[0083] In the second embodiment, the object-side and image-side surfaces of the first lens L1 and the object-side and image-side surfaces of the sixth lens L6 are both aspherical. Table 2b gives the conic constant k and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical mirror surface in the second embodiment.

[0084] Table 2a

[0085]

[0086] Table 2b

[0087]

[0088]

[0089] Please see Figure 4 ,Depend on Figure 4 As 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.

[0090] Third Embodiment

[0091] 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, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter IR, and a protective glass CG arranged sequentially along the optical axis O from the object side to the image side.

[0092] Furthermore, in the third embodiment, the refractive power and surface shape of each lens are consistent with those of each lens in the first embodiment.

[0093] 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. It is understood that the units for Y-radius, thickness, and effective focal length in Table 3a are all mm. Furthermore, the reference wavelength for the refractive index and Abbe number of each lens in Table 3a is 587.56 nm, and the reference wavelength for the effective focal length is 558 nm.

[0094] In the third embodiment, the object-side surface and image-side surface of the first lens L1 and the object-side surface and image-side surface of the sixth lens L6 are both aspherical. Table 3b gives the conic constant k and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical mirror in the third embodiment.

[0095] Table 3a

[0096]

[0097]

[0098] Table 3b

[0099]

[0100] 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.

[0101] Fourth embodiment

[0102] 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, a fourth lens L4, an aperture stop STO, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter IR, and a protective glass CG arranged sequentially along the optical axis O from the object side to the image side.

[0103] Furthermore, in the fourth embodiment, the refractive power and surface shape of each lens are consistent with those of each lens in the first embodiment.

[0104] The other parameters in the fourth embodiment are given in Table 4a 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 effective focal length in Table 4a are all mm. Furthermore, the reference wavelength for the refractive index and Abbe number of each lens in Table 4a is 587.56 nm, and the reference wavelength for the effective focal length is 558 nm.

[0105] In the fourth embodiment, the object-side surface and image-side surface of the first lens L1 and the object-side surface and image-side surface of the sixth lens L6 are both aspherical. Table 4b gives the conic constant k and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical mirror surface in the fourth embodiment.

[0106] Table 4a

[0107]

[0108]

[0109] Table 4b

[0110]

[0111] Please see Figure 8 ,Depend on Figure 8 As 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.

[0112] Fifth Embodiment

[0113] 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, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter IR, and a protective glass CG arranged sequentially along the optical axis O from the object side to the image side.

[0114] Furthermore, in the fifth embodiment, the refractive power and surface shape of each lens are consistent with those of the lenses in the first embodiment.

[0115] Other parameters in the fifth embodiment are given in Table 5a 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 Y-radius, thickness, and effective focal length in Table 5a are all mm. Furthermore, the reference wavelength for the refractive index and Abbe number of each lens in Table 5a is 587.56 nm, and the reference wavelength for the effective focal length is 558 nm.

[0116] In the fifth embodiment, the object-side surface and image-side surface of the first lens L1 and the object-side surface and image-side surface of the sixth lens L6 are both aspherical. Table 5b gives the conic constant k and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical mirror surface in the fifth embodiment.

[0117] Table 5a

[0118]

[0119] Table 5b

[0120]

[0121] 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.

[0122] Table 6 shows the values ​​of several relationships in the optical lenses 100 of the first to fifth embodiments.

[0123] Table 6

[0124]

[0125]

[0126] Please see Figure 11This 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.

[0127] Please see Figure 12 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.

[0128] 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 six refractive lenses in total, arranged sequentially from the object side to the image side along the optical axis: The first lens has negative refractive power, with the object side being convex near the optical axis and the image side being concave near the optical axis; The second lens has negative refractive power, with the object side being concave near the optical axis and the image side being convex near the optical axis; The third lens has positive refractive power, and both the object-side and image-side surfaces are convex near the optical axis. The fourth lens has positive refractive power, and both the object-side and image-side surfaces are convex near the optical axis; The fifth lens has negative refractive power, and both the object-side and image-side surfaces are concave near the optical axis. The sixth lens has positive refractive power, and both the object-side and image-side surfaces are convex near the optical axis; The optical lens satisfies the following relationship: 118°≤FOV≤130°, 6≤TTL / IMGH≤8, 1.5≤SD1 / SD3≤1.7, F45 / F≥8; Wherein, FOV is the maximum field of view of the optical lens, TTL is the distance on the optical axis from the object side of the first lens to the imaging surface of the optical lens, IMGH is the radius of the largest effective imaging circle on the imaging surface of the optical lens, SD1 is half of the largest effective aperture of the object side of the first lens, SD3 is half of the largest effective aperture of the object side of the second lens, F is the effective focal length of the optical lens, and F45 is the combined effective focal length of the fourth lens and the fifth lens.

2. The optical lens as described in claim 1, characterized in that, The optical lens satisfies the following relationship: 1.1 ≤ F / IMGH ≤ 1.3, and / or, 1.7≤FNO≤2, and / or, 0.65≤BFL / F≤0.9; Wherein, FNO is the aperture number of the optical lens, and BFL is the distance on the optical axis from the image side of the sixth lens to the imaging surface of the optical lens.

3. The optical lens as described in claim 1, characterized in that, The optical lens satisfies the following relationship: 0.7≤CT2 / CT3≤0.98, and / or, -0.5≤R5 / R6≤-0.3, and / or, 1.8 ≤ F3 / F ≤ 2.3; Wherein, CT2 is the thickness of the second lens on the optical axis, CT3 is the thickness of the third lens on the optical axis, R5 is the radius of curvature of the object side of the third lens on the optical axis, R6 is the radius of curvature of the image side of the third lens on the optical axis, and F3 is the effective focal length of the third lens.

4. The optical lens as described in claim 1, characterized in that, The optical lens satisfies the following relationship: 1 ≤ SD1 / IMGH ≤ 1.2, and / or, 0.14≤SD1 / TTL≤0.

17.

5. The optical lens as described in claim 1, characterized in that, The optical lens satisfies the following relationship: 0 < (Vd4 - Vd5) / F45 ≤ 1, and / or, 1.7≤CT4 / CT5≤5.1; Wherein, Vd4 is the Abbe number of the fourth lens, Vd5 is the Abbe number of the fifth lens, 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.

6. The optical lens as described in claim 1, characterized in that, The optical lens satisfies the following relationship: 1.7≤R1 / R2≤2.1, and / or, -0.5≤R9 / R10≤-0.2, and / or, -20≤R12 / R11≤-1; Wherein, R1 is the radius of curvature of the object side of the first lens at the optical axis, R2 is the radius of curvature of the image side of the first lens at the optical axis, R9 is the radius of curvature of the object side of the fifth lens at the optical axis, R10 is the radius of curvature of the image side of the fifth lens at the optical axis, R11 is the radius of curvature of the object side of the sixth lens at the optical axis, and R12 is the radius of curvature of the image side of the sixth lens at the optical axis.

7. The optical lens as described in claim 1, characterized in that, The optical lens satisfies the following condition: 1.2≤CT6 / ET6≤1.8, and / or, 3.8 ≤ ∑CT / ∑AT ≤ 5.8, and / or, 1≤R3 / (R4+CT2)≤1.3; Wherein, CT6 is the thickness of the sixth lens on the optical axis, ET6 is the distance from the maximum effective aperture of the object side of the sixth lens to the maximum effective aperture of the image side of the sixth lens on the optical axis, ∑CT is the sum of the thicknesses of all lenses from the first lens to the sixth lens on the optical axis, ∑AT is the sum of the air gaps between two adjacent lenses from the first lens to the sixth lens, R3 is the radius of curvature of the object side of the second lens on the optical axis, R4 is the radius of curvature of the image side of the second lens on the optical axis, and CT2 is the thickness of the second lens on the optical axis.

8. The optical lens as described in claim 1, characterized in that, The optical lens satisfies the following condition: 5 ≤ TTL / F ≤ 6.7, and / or, 64°≤FOV / FNO≤71°, and / or, 140°≤FOV F / IMGH ≤ 162°, and / or, 15.5°≤FOV IMGH / TTL≤18.9°; Wherein, FNO is the aperture number of the optical lens.

9. A camera module, characterized in that, The camera module includes a photosensitive chip and an optical lens as described in any one of claims 1-8, wherein 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 a camera module as described in claim 9, wherein the camera module is disposed in the housing.

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