Optical lens and seven-piece wide-angle lens

Abstract

The invention relates to the technical field of optical imaging, and particularly discloses an optical lens and a seven-piece wide-angle lens, the optical lens comprises seven lenses with fixed positions and an infrared filter, and the first to sixth lenses and the infrared filter are sequentially arranged from an object side to an image side along an optical axis. Wherein the first lens is a negative lens, the second lens is a positive lens, the third lens is a positive lens, the fourth lens is a negative lens, the fifth lens is a positive lens, the sixth lens is a negative lens, the seventh lens is a negative lens, and the seven lenses do not make contact with one another or only make contact with one another at the edges and cannot move one another. The optical lens provided by the invention has the advantages of large field of view, large target surface, athermalization, high resolution, small volume, low distortion and the like. Therefore, the optical lens provided by the invention is particularly suitable for equipment with relatively high requirements on field image quality, such as a motion camera, a vehicle-mounted lens, a security lens and the like.

Description

Technical Field

[0001] This invention relates to the field of optical imaging technology, and in particular to an optical lens and a seven-element wide-angle lens. Background Technology

[0002] As people's demands for shooting tools increase, the market is becoming increasingly stringent in terms of lens parameters and performance. Wide-angle lenses, due to their ability to provide a wider field of view, are widely used in industries such as surveillance, photography, and automotive. At the same time, the performance requirements for wide-angle lenses are also increasing, demanding ever-larger field of view, larger image sensors, and higher overall lens performance. Summary of the Invention

[0003] In view of this, in order to achieve a large field of view, a large image size, high clarity, and no heat generation, this invention provides an optical lens and a seven-element wide-angle lens.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: An optical lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially along the optical axis from the object side to the image side. The seven lenses do not contact each other or only contact at their edges, and are immovable from one another. The object-side surface of the first lens is convex near the optical axis, and the image-side surface is concave near the optical axis, making it a negative lens; The object-side surface of the second lens is convex near the optical axis, and the image-side surface is concave near the optical axis, making it a positive lens; The object-side surface of the third lens is convex near the optical axis, and the image-side surface is concave near the optical axis, making it a positive lens; The object-side surface of the fourth lens is convex near the optical axis, and the image-side surface is concave near the optical axis, making it a negative lens; The object-side surface of the fifth lens is convex near the optical axis, and the image-side surface is convex near the optical axis, making it a positive lens; The object-side surface of the sixth lens is concave near the optical axis, and the image-side surface is concave near the optical axis, making it a negative lens; The object-side surface of the seventh lens is concave near the optical axis, and the image-side surface is concave near the optical axis, thus it is a negative lens; The first, second, and third lenses are all glass spherical mirrors, while the fourth, fifth, sixth, and seventh lenses are all plastic aspherical mirrors. The above settings can reasonably match the optical power of each lens, as well as the material and surface shape of each lens, to achieve good imaging performance of the lens, with a field of view greater than 150°, an optical total length of TTL < 21.4mm, a maximum image height of IMGH ≥ 11.33mm, and a working wavelength of 435~650mm.

[0005] The optical lens satisfies: 150°≤FOV≤166°; 11.33mm≤IMGH≤12.13mm; Wherein FOV is the maximum field of view of the optical lens. By reasonably setting the maximum field of view of the optical lens, a sufficient field of view can be provided for the optical lens to meet the large field of view requirement of the optical lens.

[0006] IMGH is the image height corresponding to the maximum field of view of the optical lens. By reasonably setting the maximum image height of the optical lens, sufficient target surface can be provided for the optical lens to meet the large image surface characteristics of the optical lens.

[0007] An optimized version of the above technical solution is that the optical lens satisfies the following: 2.56 <IMGH / F<2.75; Controlling its ratio can effectively correct the distortion produced by the optical lens, thereby reducing the manufacturing difficulty of the optical lens while improving its resolution. In addition, it can help control the focal length of the optical lens within a reasonable range and ensure that the optical lens 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.

[0008] 1.84 < TTL / IMGH < 1.98; It can achieve large image plane imaging while taking into account the miniaturization design of optical lenses, which is conducive to improving the image sharpness of optical lenses and thus improving the image quality of optical lenses.

[0009] Wherein, F is the effective focal length of the optical lens, and TTL is the distance on the optical axis from the object side of the first lens to the imaging surface.

[0010] As a further improvement to the above technical solution: An optimized version of the above technical solution is that the optical lens satisfies the following: 1.08≤F2 / F3≤1.37; 0.77≤F6 / F7≤0.99; Wherein, F2 is the focal length of the second lens and F3 is the focal length of the third lens. By constraining the ratio of the focal length of the second lens to the focal length of the third lens within a reasonable range, the adjacent second and third lenses are placed closer together, which is beneficial for converging the large-aperture light transmitted by the first lens and smoothly transitioning it to the system behind the aperture stop, reducing the introduction of large-aperture aberrations at the edges, and improving the resolving power of the optical lens.

[0011] F6 is the focal length of the sixth lens, and F7 is the focal length of the seventh lens. By constraining the ratio of the focal lengths of the sixth and seventh lenses to a reasonable range, the adjacent sixth and seventh lenses are placed closer together, which is beneficial for the smooth transition of light to the imaging plane and improves the resolving power of the optical lens.

[0012] An optimized version of the above technical solution is that the optical lens satisfies the following: 0.98≤F123 / F≤1.08; F123 is the combined focal length of the combined lens consisting of the first lens, the second lens, and the third lens. By reasonably configuring the combined focal length of the combined lens consisting of the first lens, the second lens, and the third lens, large-angle light rays at the front end can be quickly converged and smoothly transmitted to the rear system. This is beneficial for achieving a wide angle of the optical lens, reducing the introduction of off-axis aberrations, and correcting the field curvature of the optical lens.

[0013] An optimized version of the above technical solution is that the optical lens satisfies the following: -1.11≤F67 / F≤0.85; F67 is the combined focal length of the combined lens consisting of the sixth and seventh lenses. By reasonably configuring the combined focal length of the combined lens consisting of the sixth and seventh lenses, it is beneficial to smoothly diffuse the small-diameter light at the front end to the rear to meet the requirements of a large image plane. At the same time, it corrects chromatic aberration and balances various aberrations, improves resolving power, and can effectively reduce tolerance sensitivity and improve the imaging quality of the optical lens.

[0014] An optimized version of the above technical solution is that the optical lens satisfies the following: 1.87≤F1 / F≤1.67; 2.41≤F² / F≤2.84; 2.06≤F4 / F≤2.24; -2.05≤F5 / F≤-1.49; 0.93≤F6 / F≤0.95; -1.77≤F7 / F≤-2.04; Wherein, F1 is the focal length of the first lens, F2 is the focal length of the second lens, F4 is the focal length of the fourth lens, and F5 is the focal length of the fifth lens. By satisfying the above formula, the optical power distribution can be uniform and reasonable, aberrations can be easily corrected, and image quality can be good.

[0015] An optimized version of the above technical solution is that the optical lens satisfies the following: 9.71≤R1 / R2≤12.55; 0.98≤R² / R³≤1.14; 0.28≤R3 / R4≤0.46; Wherein, R1 is the radius of curvature of the object side of the first lens, R2 is the radius of curvature of the image side of the first lens, R3 is the radius of curvature of the object side of the second lens, and R4 is the radius of curvature of the image side of the second lens. By reasonably matching the ratio between the radii of curvature of the first lens and the second lens, the surface shape difference between the first lens and the second lens is set reasonably, which is conducive to controlling the shape of the first lens and the second lens. The combination of the two can effectively converge the light of a wide-angle lens, meet the characteristic requirements of a wide-angle lens, correct the aberrations generated by themselves, and improve the image quality.

[0016] An optimized version of the above technical solution is that the optical lens satisfies the following: 1.02≤R10 / F≤1.18; By controlling the ratio of the radius of curvature of the image side surface of the fifth lens to the total effective focal length of the optical lens within a certain range, the image side surface of the fifth lens is controlled to be convex near the optical axis, which has a greater ability to deflect light. This can push down the light rays that have passed through the first, second, third, and fourth lenses, alleviate the converging pressure of subsequent lenses, correct aberrations generated by the front system, and improve image quality.

[0017] 0.87≤R9 / R10≤1.03; By controlling its ratio range, the fifth lens has similar adjacent shapes, reducing its sensitivity and facilitating a smooth transition of light to the rear.

[0018] Wherein, R9 is the radius of curvature of the object side of the fifth lens at the optical axis, and R10 is the radius of curvature of the image side of the fifth lens at the optical axis.

[0019] An optimized version of the above technical solution is that the optical lens satisfies the following: an aperture is provided on the image-side surface of the third lens, which easily achieves a large field of view, a large target surface, high image quality, low distortion, and small volume; an infrared filter is provided between the seventh lens and the imaging surface of the optical lens.

[0020] The present invention also provides a seven-element wide-angle lens, which employs the aforementioned optical lens.

[0021] Compared with existing technologies, the beneficial effects of this invention are: In the optical lens of this invention, the configuration of the first lens allows it to compress large-aperture light rays, increasing light transmission. The configuration of the second lens smoothly converges the large-aperture light rays transmitted forward, which helps to eliminate aberrations generated by the first lens and reduce the system aperture. The third and fourth lenses work together to receive the large-aperture light rays from the front and smoothly transition them to the rear, shortening the optical path difference between the center and edge fields of view, reducing distortion, and increasing illumination. At the same time, they can effectively correct paraxial spherical aberration, reduce peripheral astigmatism curvature, and improve resolution. The configuration of the fifth and sixth lenses helps to move the principal point of the optical system away from the image side, thereby effectively shortening the overall length of the optical imaging system. The sixth and seventh lenses, through their aspherical curvature design, increase the back focal length, making it easier to match chips with large CRA (Chip-Ray Amplifier) ​​sensors, converge light rays, correct aberrations, improve system resolution, and effectively correct distortion in the edge fields of view, achieving low distortion in the optical lens.

[0022] The optical lens described in this invention has advantages such as a large field of view, a large target surface, no pyrolysis, high resolution, small size, and low distortion. The optical lens of this invention is particularly suitable for devices requiring high field of view and image quality, such as action cameras, automotive lenses, and security lenses. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the optical lens in Embodiment 1 of the present invention.

[0024] Figure 2 This is an MTF curve of the optical lens in Embodiment 1 of the present invention at +20°C.

[0025] Figure 3 This is a field curvature and F-tan(θ) distortion curve of the optical lens in Embodiment 1 of the present invention.

[0026] Figure 4 This is the MTF defocus curve of the optical lens at +20℃ in Embodiment 1 of the present invention.

[0027] Figure 5 This is the MTF defocus curve of the optical lens in Embodiment 1 of the present invention at -40℃.

[0028] Figure 6 This is the MTF defocus curve of the optical lens at +80°C in Embodiment 1 of the present invention.

[0029] Figure 7 This is a schematic diagram of the structure of the optical lens in Embodiment 2 of the present invention.

[0030] Figure 8 This is the MTF curve of the optical lens in Embodiment 2 of the present invention at +20℃.

[0031] Figure 9 This is a field curvature and F-tan(θ) distortion curve of the optical lens in Embodiment 2 of the present invention.

[0032] Figure 10 This is the MTF defocus curve of the optical lens in Embodiment 2 of the present invention at +20℃.

[0033] Figure 11 This is the MTF defocus curve of the optical lens in Embodiment 2 of the present invention at -40℃.

[0034] Figure 12 This is the MTF defocus curve of the optical lens at +80°C in Embodiment 2 of the present invention.

[0035] Figure 13 This is a schematic diagram of the structure of the optical lens in Embodiment 3 of the present invention.

[0036] Figure 14 This is the MTF curve of the optical lens in Embodiment 3 of the present invention at +20℃.

[0037] Figure 15 This is a field curvature and F-tan(θ) distortion curve of the optical lens in Embodiment 3 of the present invention.

[0038] Figure 16 This is the MTF defocus curve of the optical lens in Embodiment 3 of the present invention at +20℃.

[0039] Figure 17 This is the MTF defocus curve of the optical lens in Embodiment 3 of the present invention at -40℃.

[0040] Figure 18 This is the MTF defocus curve of the optical lens at +80°C in Embodiment 3 of the present invention.

[0041] Figure descriptions: 1. First lens; 2. Second lens; 3. Third lens; 4. Fourth lens; 5. Fifth lens; 6. Sixth lens; 7. Seventh lens; 8. Aperture; 9. Infrared filter. Detailed Implementation

[0042] The technical solutions in the embodiments of this technical solution will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this technical solution, and not all embodiments.

[0043] In the description of this technical solution, unless otherwise stated, "multiple" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this technical solution and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this technical solution. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In the description of this technical solution, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this technical solution based on the specific circumstances.

[0045] In this technical solution, it should be noted that the object side of the lens refers to the side of the lens facing the object, and the image side refers to the side of the lens facing the imaging plane. When a cross-section is made at any point on the object side surface of the lens, if the object side surface is always located on the image side of the cross-section and its radius of curvature is positive, then the object side surface of the lens is convex; otherwise, the object side surface of the lens is concave. When a cross-section is made at any point on the image side surface of the lens, if the image side surface is always on the object side of the cross-section and its radius of curvature is negative, then the image side surface of the lens is convex; otherwise, the image side surface of the lens is concave. If a cross-section is made at any point on either the object side surface or the cross-section of the image side surface of the lens, and the object side surface or the image side surface is partially on the image side and partially on the object side of the cross-section, then the surface has a point of inflection. The above method still applies to determining the concavity or convexity of the object side and image side surfaces near the optical axis.

[0046] Furthermore, the equations for the aspherical curves of each aspherical lens are expressed as follows: Where Z is the distance vector from the origin of the aspherical surface at a height of r along the optical axis; c is the paraxial curvature of the aspherical surface (radius of curvature R = 1 / c, which is the reciprocal of curvature); k is the conic coefficient; Ai is the i-th order coefficient of the aspherical surface, and the higher order coefficients used in this invention are A4, A6, A8, A10, A12, A14, and A16.

[0047] The main component of this technical solution is the optical lens. This optical lens design is then applied to a seven-element wide-angle lens. Therefore, the specific description of the optical lens is as follows: The main components of this technical solution include lenses with optical power that are fixed sequentially along the optical axis from the object side to the image side. These lenses are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an infrared filter, and an imaging surface. An aperture is provided on the image-side surface of the third lens.

[0048] The first lens has negative refractive power. Its object-side surface is convex near the optical axis to converge large-aperture light rays into the rear optical system as much as possible. Its image-side surface is concave near the optical axis to quickly diffuse light rays into the rear optical system. The configuration of the first lens can reduce light loss and improve illumination.

[0049] The second lens has positive refractive power. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. This facilitates the reception of the large aperture from the first lens and further converges and compresses it into the rear system. This is beneficial for light convergence, can effectively correct paraxial spherical aberration, reduce peripheral astigmatism, and improve resolution.

[0050] The third lens has positive refractive power. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. It further converges and focuses the light from the first and second lenses, thereby increasing the physical aperture of the aperture and achieving a greater amount of light transmission. This helps to increase the illumination of the image and allows the light emitted from the first lens to be incident smoothly into the rear.

[0051] The fourth lens has negative refractive power. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. As a negative lens, it diffuses the small-angle light passing through the aperture for the first time, so that the rear system can achieve large target imaging. After the light is diffused, it smoothly transitions to the rear end, shortens the optical path difference between the center and the edge fields of view, reduces distortion, and increases illumination.

[0052] The fifth lens has positive refractive power. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. It receives large-diameter light rays from the front, reduces the deflection angle of the light rays, corrects field curvature and spherical aberration, reduces the introduction of higher-order aberrations, and converges the light rays from the front to the rear end smoothly.

[0053] The sixth lens has negative refractive power. Its object-side surface is concave near the optical axis, and its image-side surface is also concave near the optical axis. It has a certain degree of curvature, which diffuses the light twice. This helps to move the principal point of the optical imaging system away from the image side, thereby effectively shortening the overall length of the optical imaging system, effectively correcting paraxial spherical aberration, and reducing the astigmatism curvature in the periphery.

[0054] The seventh lens has negative refractive power, with both its object-side and image-side surfaces concave near the optical axis. It diffuses light three times to achieve a large image plane, requiring a certain degree of curvature on the rear surface. By setting the surfaces of the sixth and seventh lenses aspherical and utilizing this aspherical curvature design, the back focal length is increased, facilitating matching with large CRA (Crystal Resonance Amplifier) ​​chips, converging light, correcting aberrations, and improving system resolution. Simultaneously, it effectively corrects distortion at the edges of the field of view, achieving low distortion in the optical lens.

[0055] The seven lenses do not touch each other or only touch at their edges, and cannot move from one another. The first, second, and third lenses are all glass spherical mirrors, while the fourth, fifth, sixth, and seventh lenses are all plastic aspherical mirrors.

[0056] Meanwhile, the aforementioned optical lenses should meet the following requirements: 150°≤FOV≤166°; 11.33mm≤IMGH≤12.13mm; 2.56 <IMGH / F<2.75; 1.84 < TTL / IMGH < 1.98; 1.08≤F2 / F3≤1.37; 0.77≤F6 / F7≤0.99; 0.98≤F123 / F≤1.08; -1.11≤F67 / F≤0.85; 1.87≤F1 / F≤1.67; 2.41≤F² / F≤2.84; 2.06≤F4 / F≤2.24; -2.05≤F5 / F≤-1.49; 0.93≤F6 / F≤0.95; -1.77≤F7 / F≤-2.04; 9.71≤R1 / R2≤12.55; 0.98≤R² / R³≤1.14; 0.28≤R3 / R4≤0.46; 1.02≤R10 / F≤1.18; 0.87≤R9 / R10≤1.03; Wherein, FOV is the maximum field of view of the optical lens, IMGH is the image height corresponding to the maximum field of view of the optical lens, TTL is the distance from the object side of the first lens to the imaging plane on the optical axis, F is the effective focal length of the optical lens, F1 is the focal length of the first lens, F2 is the focal length of the second lens, F3 is the focal length of the third lens, F4 is the focal length of the fourth lens, F5 is the focal length of the fifth lens, F6 is the focal length of the sixth lens, F7 is the focal length of the seventh lens, F123 is the combined focal length of the combined lens formed by the first, second, and third lenses, F67 is the combined focal length of the combined lens formed by the sixth and seventh lenses, R1 is the radius of curvature of the object side of the first lens, R2 is the radius of curvature of the image side of the first lens, R3 is the radius of curvature of the object side of the second lens, R4 is the radius of curvature of the image side of the second lens, R9 is the radius of curvature of the object side of the fifth lens on the optical axis, and R10 is the radius of curvature of the image side of the fifth lens on the optical axis.

[0057] Example 1 According to the requirements of the above technical solution, as shown in the appendix Figure 1 This is a schematic diagram of an optical lens. Based on the constraints of the above formula, the design parameters are as follows: The remaining detailed parameters related to aspherical surfaces are shown in the table below: Figure 2 This is the MTF curve of this embodiment. As shown in the figure, the MTF of the full field of view modulation function is greater than 52% at 100 lp / mm, which has high clarity. Figure 3 This is a field curvature and distortion curve diagram of this embodiment, showing that the field curvature and distortion of the optical lens are well controlled; Figure 4 This is a defocus curve of the lens in this embodiment at 20°C. The defocus curve shows the relationship between the meridional and sagittal MTF and the defocus amount for different fields of view at a set frequency of 100 lp / mm.

[0058] Figure 5 This is the defocus curve of this embodiment at -40℃. Compared with the defocus curve at 20℃, there is no obvious defocus and the image quality is clear.

[0059] Figure 6 This is the defocus curve at 80°C in this embodiment. Compared with the defocus curve at 20°C, there is no obvious defocus and the image quality is clear.

[0060] Example 2 According to the requirements of the above technical solution, as shown in the appendix Figure 7This is a schematic diagram of an optical lens. Based on the constraints of the above formula, the design parameters are as follows: The remaining detailed parameters related to aspherical surfaces are shown in the table below: Figure 8 This is the MTF curve of this embodiment. As shown in the figure, the MTF of the full field of view modulation function is greater than 50% at 100 lp / mm, which has high clarity. Figure 9 This is a field curvature and distortion curve diagram of this embodiment, showing that the field curvature and distortion of the optical lens are well controlled; Figure 10 This is a defocus curve of the lens in this embodiment at 20°C. The defocus curve shows the relationship between the meridional and sagittal MTF and the defocus amount for different fields of view at a set frequency of 100 lp / mm.

[0061] Figure 11 This is the defocus curve of this embodiment at -40℃. Compared with the defocus curve at 20℃, there is no obvious defocus and the image quality is clear.

[0062] Figure 12 This is the defocus curve at 80°C in this embodiment. Compared with the defocus curve at 20°C, there is no obvious defocus and the image quality is clear.

[0063] Example 3 According to the requirements of the above technical solution, as shown in the appendix Figure 13 This is a schematic diagram of an optical lens. Based on the constraints of the above formula, the design parameters are as follows: The remaining detailed parameters related to aspherical surfaces are shown in the table below: Figure 14 This is the MTF curve of this embodiment. As shown in the figure, the MTF of the full field of view modulation function is greater than 50% at 100 lp / mm, which has high clarity. Figure 15 This is a field curvature and distortion curve diagram of this embodiment, showing that the field curvature and distortion of the optical lens are well controlled; Figure 16 This is a defocus curve of the lens in this embodiment at 20°C. The defocus curve shows the relationship between the meridional and sagittal MTF and the defocus offset for different fields of view at a set frequency of 100 lp / mm.

[0064] Figure 17 This is the defocus curve of this embodiment at -40℃. Compared with the defocus curve at 20℃, there is no obvious defocus and the image quality is clear.

[0065] Figure 18 This is the defocus curve at 80°C in this embodiment. Compared with the defocus curve at 20°C, there is no obvious defocus, and the image quality is clear.

[0066] In summary, the optical lens described above adopts a seven-element lens structure. Through reasonable lens property matching, when specific conditions are met, the optical lens has advantages such as large field of view, large target surface, no pyrolysis, small size, high definition, and low distortion, while also having good optical imaging capabilities.

[0067] The above are merely preferred embodiments of this technical solution, but the scope of protection of this technical solution is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this technical solution, based on the technical solution and its concept, should be included within the scope of protection of this technical solution.

Claims

1. An optical lens comprising a first lens (1), a second lens (2), a third lens (3), a fourth lens (4), a fifth lens (5), a sixth lens (6), and a seventh lens (7) arranged sequentially along the optical axis from the object side to the image side, wherein the seven lenses do not contact each other or only contact each other at their edges, and are immovable from each other, characterized in that, The object-side surface of the first lens (1) is convex near the optical axis, and the image-side surface is concave near the optical axis, making it a negative lens; The object-side surface of the second lens (2) is convex near the optical axis, and the image-side surface is concave near the optical axis, making it a positive lens; The object-side surface of the third lens (3) is convex near the optical axis, and the image-side surface is concave near the optical axis, making it a positive lens; The object-side surface of the fourth lens (4) is convex near the optical axis, and the image-side surface is concave near the optical axis, making it a negative lens; The object-side surface of the fifth lens (5) is convex near the optical axis, and the image-side surface is convex near the optical axis, making it a positive lens; The object-side surface of the sixth lens (6) is concave near the optical axis, and the image-side surface is concave near the optical axis, making it a negative lens; The object-side surface of the seventh lens (7) is concave near the optical axis, and the image-side surface is concave near the optical axis, making it a negative lens; The first lens, the second lens, and the third lens are all glass spherical mirrors, while the fourth lens, the fifth lens, the sixth lens, and the seventh lens are all plastic aspherical mirrors. The optical lens satisfies: 150°≤FOV≤166°; 11.33mm≤IMGH≤12.13mm; Wherein FOV is the maximum field of view of the optical lens, and IMGH is the image height corresponding to the maximum field of view of the optical lens.

2. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 2.56 <IMGH / F<2.75; 1.84 < TTL / IMGH < 1.98; Wherein, F is the effective focal length of the optical lens, and TTL is the distance on the optical axis from the object side of the first lens (1) to the imaging surface.

3. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 1.08≤F2 / F3≤1.37; 0.77≤F6 / F7≤0.99; Wherein, F2 is the focal length of the second lens (2), F3 is the focal length of the third lens (3), F6 is the focal length of the sixth lens (6), and F7 is the focal length of the seventh lens (7).

4. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 0.98≤F123 / F≤1.08; F123 is the combined focal length of the combined lens consisting of the first lens (1), the second lens (2), and the third lens (3).

5. The optical lens according to claim 1, characterized in that, The optical lens satisfies: -1.11≤F67 / F≤0.85; F67 is the combined focal length of the combined lens formed by the sixth lens (6) and the seventh lens (7).

6. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 1.87≤F1 / F≤1.67; 2.41≤F² / F≤2.84; 2.06≤F4 / F≤2.24; -2.05≤F5 / F≤-1.49; 0.93≤F6 / F≤0.95; -1.77≤F7 / F≤-2.04; Wherein, F1 is the focal length of the first lens (1), F2 is the focal length of the second lens (2), F4 is the focal length of the fourth lens (4), and F5 is the focal length of the fifth lens (5).

7. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 9.71≤R1 / R2≤12.55; 0.98≤R² / R³≤1.14; 0.28≤R3 / R4≤0.46; Wherein, R1 is the radius of curvature of the object side of the first lens (1), R2 is the radius of curvature of the image side of the first lens (1), R3 is the radius of curvature of the object side of the second lens (2), and R4 is the radius of curvature of the image side of the second lens (2).

8. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 1.02≤R10 / F≤1.18; 0.87≤R9 / R10≤1.03; Wherein, R9 is the radius of curvature of the object side of the fifth lens (5) at the optical axis, and R10 is the radius of curvature of the image side of the fifth lens (5) at the optical axis.

9. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following: an aperture stop (8) is provided on the image-side surface of the third lens (3), and an infrared filter (9) is provided between the seventh lens (7) and the imaging surface of the optical lens.

10. A seven-element wide-angle lens, characterized in that, A seven-element wide-angle lens employing the optical lens described in any one of claims 1 to 9.

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