Optical lens

Abstract

The application provides an optical lens, which comprises eight lenses in sequence along an optical axis from an object side to an imaging surface, and the eight lenses comprise: a first lens with negative optical power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; a second lens with negative optical power, the object side surface of the second lens is a concave surface; a third lens with positive optical power, the object side surface of the third lens is a convex surface; a fourth lens with positive optical power, the object side surface of the fourth lens is a convex surface; a fifth lens with positive optical power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface; a sixth lens with negative optical power, the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface; a seventh lens with positive optical power, the object side surface of the seventh lens is a convex surface; and an eighth lens with positive optical power, the object side surface of the eighth lens is a concave surface, and the image side surface of the eighth lens is a convex surface. The optical lens provided by the application has one or more advantages of super wide angle, large imaging surface, large aperture, high imaging quality and the like through specific surface shape matching and reasonable optical power distribution.

Description

Technical Field

[0001] This invention relates to the technical field of imaging lenses, and in particular to an optical lens. Background Technology

[0002] As people's demands for driving experience continue to increase, automotive optical lenses are being used more and more in intelligent driving, and the status of automotive optical lenses in the automotive industry is constantly rising.

[0003] Advanced Driver Assistance Systems (ADAS) play a crucial role in intelligent driving. They use various lenses and sensors to collect environmental information to ensure driver safety. Existing ADAS lenses not only require a slim and compact design with high pixel count and high resolution, but also need to produce clear images in low-light conditions. Therefore, it is necessary to develop an optical lens with excellent imaging performance. Summary of the Invention

[0004] To address the aforementioned problems, the present invention aims to provide an optical lens with the advantage of excellent image quality.

[0005] The technical solution adopted in this invention is as follows:

[0006] An optical lens comprising eight lenses, arranged sequentially along the optical axis from the object side to the imaging plane:

[0007] The first lens with negative optical power has a convex object side and a concave image side.

[0008] A second lens with negative optical power has a concave object side.

[0009] A third lens with positive optical power has a convex object-side surface;

[0010] The fourth lens has positive optical power and its object side is convex.

[0011] The fifth lens with positive optical power has a convex object side and a concave image side.

[0012] The sixth lens with negative optical power has a convex object side and a concave image side.

[0013] The seventh lens, which has positive optical power, has a convex object-side surface;

[0014] The eighth lens, which has positive optical power, has a concave object side and a convex image side.

[0015] Among them, the curvature radius R9 of the object side surface of the fifth lens and the curvature radius R10 of the image side surface of the fifth lens satisfy: -0.8 < (R9 - R10) / (R9 + R10) < -0.4; the curvature radius R15 of the object side surface of the eighth lens and the curvature radius R16 of the image side surface of the eighth lens satisfy: 0 < (R15 - R16) / (R15 + R16) < 0.7.

[0016] Further preferably, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 6.1 < TTL / f < 8.5; the total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 2.8 < TTL / IH < 3.5.

[0017] Further preferably, the maximum field angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 80° < FOV / Fno < 100°; the true image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 3.1 < IH / EPD < 4.5.

[0018] Further preferably, the true image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 1.9 < IH / f < 2.7; the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 0.6 < BFL / f < 1.01.

[0019] Further preferably, the clear aperture d1 of the object side surface of the first lens, the true image height IH corresponding to the maximum field angle of the optical lens and the maximum field angle FOV of the optical lens satisfy: 0.33 < d1 / (IH / 2) / tan(FOV / 2) < 0.62; the combined focal length f45678 of the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens and the effective focal length f of the optical lens satisfy: 1.3 < f45678 / f < 2.4.

[0020] Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 1.7 < f4 / f < 3.6; the curvature radius R7 of the object side surface of the fourth lens and the effective focal length f of the optical lens satisfy: 1.2 < R7 / f < 2.

[0021] It should be noted that there is a small error in the inequality in the translation of where "0.6 < BFL / f < 1.01" should be "0.63 < BFL / f < 1.01" according to the original text. Please check and correct it if necessary.Further preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 2.3 < f5 / f < 6.8; the object-side curvature radius R9 of the fifth lens and the effective focal length f of the optical lens satisfy: 1 < R9 / f < 2.3; the image-side curvature radius R10 of the fifth lens and the effective focal length f of the optical lens satisfy: 5.5 < R10 / f < 8.

[0022] Further preferably, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -2 < f6 / f < -0.9; the object-side curvature radius R11 of the sixth lens and the effective focal length f of the optical lens satisfy: 5.5 < R11 / f < 8; the image-side curvature radius R12 of the sixth lens and the effective focal length f of the optical lens satisfy: 0.6 < R12 / f < 1.2.

[0023] Further preferably, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 1.1 < f7 / f < 1.9; the object-side curvature radius R13 of the seventh lens and the effective focal length f of the optical lens satisfy: 0.6 < R13 / f < 1.2.

[0024] Further preferably, the effective focal length f of the optical lens and the focal length f8 of the eighth lens satisfy: 12 < f8 / f < 39; the object-side curvature radius R15 of the eighth lens and the effective focal length f of the optical lens satisfy: -40 < R15 / f < -4.5; the image-side curvature radius R16 of the eighth lens and the effective focal length f of the optical lens satisfy: -16.5 < R16 / f < -4.

[0025] The optical lens provided by the present invention adopts eight lenses with specific optical powers. Through specific surface shape combinations and reasonable optical power distributions, it can improve the imaging quality of the optical lens, reduce aberrations, and enhance the imaging quality of the optical lens, enabling the lens to have one or more advantages such as ultra-wide angle, large image plane, large aperture, and high imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and easy to understand from the following description of the embodiments in conjunction with the accompanying drawings, where:

[0027] Figure 1 is a schematic structural diagram of the optical lens in Embodiment 1 of the present invention.

[0028] Figure 2 is a MTF curve graph of the optical lens in Embodiment 1 of the present invention.

[0029] Figure 3 is a schematic structural diagram of the optical lens in Embodiment 2 of the present invention.

[0030] Figure 4 This is the MTF curve of the optical lens in Embodiment 2 of the present invention.

[0031] Figure 5 This is a schematic diagram of the optical lens in Embodiment 3 of the present invention.

[0032] Figure 6 This is an MTF curve of the optical lens in Embodiment 3 of the present invention.

[0033] Figure 7 This is a schematic diagram of the optical lens in Embodiment 4 of the present invention.

[0034] Figure 8 This is the MTF curve of the optical lens in Embodiment 4 of the present invention.

[0035] Figure 9 This is a schematic diagram of the optical lens in Embodiment 5 of the present invention.

[0036] Figure 10 This is the MTF curve of the optical lens in Embodiment 5 of the present invention.

[0037] Figure 11 This is a schematic diagram of the optical lens in Embodiment 6 of the present invention.

[0038] Figure 12 This is an MTF curve of the optical lens in Embodiment 6 of the present invention.

[0039] Figure 13 This is a schematic diagram of the optical lens in Embodiment 7 of the present invention.

[0040] Figure 14 This is the MTF curve of the optical lens in Embodiment 7 of the present invention.

[0041] Figure 15 This is a schematic diagram of the optical lens in Embodiment 8 of the present invention.

[0042] Figure 16 This is the MTF curve of the optical lens in Embodiment 8 of the present invention.

[0043] Figure 17 This is a schematic diagram of the optical lens structure in Embodiment 9 of the present invention.

[0044] Figure 18 This is the MTF curve of the optical lens in Embodiment 9 of the present invention.

[0045] Figure 19 This is a schematic diagram of the optical lens structure in Embodiment 10 of the present invention.

[0046] Figure 20 This is the MTF curve of the optical lens in Embodiment 10 of the present invention.

[0047] Figure 21 This is a schematic diagram of the optical lens structure in Embodiment 11 of the present invention.

[0048] Figure 22 This is the MTF curve of the optical lens in Embodiment 11 of the present invention.

[0049] Figure 23 This is a schematic diagram of the optical lens structure in Embodiment 12 of the present invention.

[0050] Figure 24 This is the MTF curve of the optical lens in Embodiment 12 of the present invention.

[0051] Figure 25 This is a schematic diagram of the optical lens structure in Embodiment 13 of the present invention.

[0052] Figure 26 This is the MTF curve of the optical lens in Embodiment 13 of the present invention.

[0053] Figure 27 This is a schematic diagram of the optical lens structure in Embodiment 14 of the present invention.

[0054] Figure 28 This is the MTF curve of the optical lens in Embodiment 14 of the present invention.

[0055] Figure 29 This is a schematic diagram of the optical lens structure in Embodiment 15 of the present invention.

[0056] Figure 30 This is the MTF curve of the optical lens in Embodiment 15 of the present invention.

[0057] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0058] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0059] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of the invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0060] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0061] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0062] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0063] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formal sense unless expressly so specified herein.

[0064] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0065] The optical lens provided in this embodiment of the invention has a total of eight lenses, which are arranged sequentially from the object side to the imaging plane along the optical axis as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens.

[0066] In some embodiments, the first lens may have negative optical power, with its object-side surface being convex and its image-side surface being concave. The second lens may have negative optical power, with its object-side surface being concave and its image-side surface being either concave or convex. The third lens may have positive optical power, with its object-side surface being convex and its image-side surface being either concave or convex. The fourth lens may have positive optical power, with its object-side surface being convex and its image-side surface being either concave or convex. The fifth lens may have positive optical power, with its object-side surface being convex and its image-side surface being concave. The sixth lens may have negative optical power, with its object-side surface being convex and its image-side surface being concave. The seventh lens may have positive optical power, with its object-side surface being convex and its image-side surface being either concave or convex. The eighth lens may have positive optical power, with its object-side surface being concave and its image-side surface being convex.

[0067] In some embodiments, the optical lens may also include an aperture stop, which may be located between the third and fourth lenses. It is understood that the aperture stop is used to limit the amount of light entering the lens to change the brightness of the image. When the aperture stop is located between the third and fourth lenses, it facilitates the correction of aperture aberrations.

[0068] In some embodiments, the optical lens may further include a filter and a protective glass, which are sequentially disposed along the optical axis between the eighth lens and the imaging plane. The filter is used to filter out interfering light, preventing it from reaching the imaging plane of the optical lens and affecting normal imaging. The protective glass protects the optical lens, preventing damage to the image sensor and affecting the lens's imaging performance.

[0069] In some embodiments, the fifth, sixth, and seventh lenses can be cemented together to form a cemented lens, which can effectively correct chromatic aberration of the optical lens, reduce the eccentricity sensitivity of the optical lens, balance the aberrations of the optical lens, and improve the imaging quality of the optical lens; it can also reduce the assembly sensitivity of the optical lens, thereby reducing the processing difficulty of the optical lens and improving the assembly yield of the optical lens.

[0070] In some embodiments, the object-side radius of curvature R9 of the fifth lens and the image-side radius of curvature R10 of the fifth lens satisfy: -0.8 < (R9 - R10) / (R9 + R10) < -0.4. Satisfying this range, the fifth lens has a meniscus shape, which is beneficial for improving the light-gathering ability of the optical lens, while also balancing various aberrations generated by the optical lens and improving the imaging quality of the optical lens. More specifically, -0.7 < (R9 - R10) / (R9 + R10) < -0.49.

[0071] In some embodiments, the radius of curvature R15 of the object side surface of the eighth lens and the radius of curvature R16 of the image side surface of the eighth lens satisfy: 0 < (R15 - R16) / (R15 + R16) < 0.7. Satisfying the above range is beneficial to suppressing the angle of the marginal field incident on the imaging surface, effectively transmitting more light beams to the imaging surface, and at the same time being able to balance the field curvature and spherical aberration of the optical lens, improving the imaging quality of the optical lens. More specifically, 0.05 < (R15 - R16) / (R15 + R16) < 0.58.

[0072] In some embodiments, the overall optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 6.1 < TTL / f < 8.5. Satisfying the above range can effectively limit the length of the lens, which is beneficial to the miniaturization of the optical lens. More specifically, 6.71 < TTL / f < 7.79.

[0073] In some embodiments, the overall optical length TTL of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: urchasing cost, improve the imaging quality of the optical lens. More specifically, 3.08 < TTL / IH < 3.32.

[0074] In some embodiments, the maximum field angle FOV of the optical lens and the f-number Fno of the optical lens satisfy: 80° < FOV / Fno < 100°. Satisfying the above range defines that the optical lens has a suitable field angle and f-number, can collect light at large angles and obtain good imaging quality. More specifically, 84.14° < FOV / Fno < 94.08°.

[0075] In some embodiments, the true image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 3.1 < IH / EPD < 4.5. Satisfying the above range can increase the width of the light beam incident on the optical lens, improve the brightness of the optical lens at the image plane and avoid vignetting. More specifically, 3.42 < IH / EPD < 4.2.

[0076] In some embodiments, the true image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 1.9 < IH / f < 2.7. Satisfying the above range controls the image height and focal length of the optical lens within a reasonable range, helps the optical lens to have the characteristic of a large image plane, and improves the imaging quality. More specifically, 2.12 < IH / f < 2.47.

[0077] In some embodiments, the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 0.63 < BFL / f < 1.01. Meeting the above range defines that the optical lens has an appropriate back focus, facilitating the reasonable arrangement of the positions of each lens and reducing the processing and assembly difficulty at the same time.

[0078] In some embodiments, the clear aperture d1 of the object side surface of the first lens, the true image height IH corresponding to the maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens satisfy: 0.33 < d1 / (IH / 2) / tan(FOV / 2) < 0.62. Meeting the above range can have a small front aperture while meeting the requirements of the optical lens having a large field angle and a large image plane.

[0079] In some embodiments, the combined focal length f45678 of the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens and the effective focal length f of the optical lens satisfy: 1.3 < f45678 / f < 2.4. Meeting the above range, by reasonably setting the relationship of the lens group behind the aperture stop, it is beneficial to balance various aberrations generated by the lens group in front of the aperture stop and improve the overall imaging quality. More specifically, 1.39 < f45678 / f < 2.2.

[0080] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 1.7 < f4 / f < 3.6; the curvature radius R7 of the object side surface of the fourth lens and the effective focal length f of the optical lens satisfy: 1.2 < R7 / f < 2. Meeting the above range, the fourth lens has a positive optical power and a convex object side surface, which can further focus the light, adjust the angle of the chief ray, optimize the imaging quality, and correct the remaining aberrations (such as distortion, chromatic aberration, etc.), reducing the distortion of the wide-angle lens. More specifically, 1.81 < f4 / f < 3.37; 1.36 < R7 / f < 1.9.

[0081] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 2.3 < f5 / f < 6.8; the curvature radius R9 of the object side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 1 < R9 / f < 2.3; the curvature radius R10 of the image side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 5.5 < R10 / f < 8. Meeting the above range is beneficial to the convergence of light, sharing the positive optical power of the third lens and the fourth lens, avoiding excessive light deflection, and better realizing the high-quality imaging of the lens. More specifically, 2.52 < f5 / f < 6.19; 1.06 < R9 / f < 2.16; 5.79 < R10 / f < 7.25.

[0082] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -2 < f6 / f < -0.9; the radius of curvature R11 of the object side surface of the sixth lens and the effective focal length f of the optical lens satisfy: 5.5 < R11 / f < 8; the radius of curvature R12 of the image side surface of the sixth lens and the effective focal length f of the optical lens satisfy: 0.6 < R12 / f < 1.2. Meeting the above ranges makes the light rays in the marginal field of view show an upward trend, which is conducive to the image points on the imaging surface moving away from the optical axis, so as to achieve the effect of matching with a large chip, obtain a larger picture, effectively eliminate aberration, and improve the resolution ability of the optical lens. More specifically, -1.83 < f6 / f < -0.96; 5.79 < R11 / f < 7.25; 0.67 < R12 / f < 1.1.

[0083] In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 1.1 < f7 / f < 1.9; the radius of curvature R13 of the object side surface of the seventh lens and the effective focal length f of the optical lens satisfy: 0.6 < R13 / f < 1.2. Meeting the above ranges is conducive to the convergence of light rays, making the light ray trend transition smoothly to the rear, reducing the height of the light rays incident on the rear, slowing down the upward trend of the light rays, avoiding the light energy loss caused by the excessive main ray angle between the large field of view light rays and the chip when reaching the imaging surface, being beneficial to improving the illuminance of the marginal field of view, and being conducive to achieving a short overall optical length. More specifically, 1.21 < f7 / f < 1.78; 0.67 < R13 / f < 1.1.

[0084] In some embodiments, the effective focal length f of the optical lens and the focal length f8 of the eighth lens satisfy: 12 < f8 / f < 39; the radius of curvature R15 of the object side surface of the eighth lens and the effective focal length f of the optical lens satisfy: -40 < R15 / f < -4.5; the radius of curvature R16 of the image side surface of the eighth lens and the effective focal length f of the optical lens satisfy: -16.5 < R16 / f < -4. Meeting the above ranges, setting the eighth lens to have positive refractive power and a suitable surface shape is conducive to the convergence of light rays, making the light ray trend transition smoothly to the rear, reducing the height of the light rays incident on the rear, slowing down the upward trend of the light rays, avoiding the light energy loss caused by the excessive main ray angle between the large field of view light rays and the chip when reaching the imaging surface, being beneficial to improving the illuminance of the marginal field of view, and being conducive to achieving a short overall optical length. More specifically, 12.97 < f8 / f < 35.78; -38.89 < R15 / f < -4.97; -15.05 < R16 / f < -4.39.

[0085] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -2.4 < f1 / f < -1.5; the radius of curvature R1 of the object side surface of the first lens and the effective focal length f of the optical lens satisfy: 5.5 < R1 / f < 16.5; the radius of curvature R2 of the image side surface of the first lens and the effective focal length f of the optical lens satisfy: 1.1 < R2 / f < 1.4. Meeting the above ranges, by setting the first lens to have a negative refractive power and a suitable surface shape, it is beneficial for the first lens to accommodate a larger angle of light and collect as much light as possible into the rear optical system, increasing the light flux while achieving a large field of view. More specifically, -2.23 < f1 / f < -1.65; 6.03 < R1 / f < 15.05; 1.14 < R2 / f < 1.32.

[0086] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -22.5 < f2 / f < -1.9. Meeting the above range makes the second lens have a negative optical power and has the effect of diverging light. At the same field angle, it further diverges the light emerging from the image side surface of the first lens, and can disperse the central light and the marginal light of each field of view, enabling the rear optical system to have a larger light receiving surface to receive the light emerging from the image side surface of the second lens, achieving a larger light input amount and being beneficial for increasing the relative illumination. More specifically, -20.62 < f2 / f < -2.13.

[0087] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 2.6 < f3 / f < 90; the radius of curvature R5 of the object side surface of the third lens and the effective focal length f of the optical lens satisfy: 2 < R5 / f < 13.5. Meeting the above ranges, it is defined that the third lens has an appropriate positive optical power and the object side surface is convex, having the effect of converging light and depressing the height of the peripheral light, which is beneficial for reducing the aperture of the rear lens. More specifically, 2.86 < f3 / f < 80.95; 2.22 < R5 / f < 12.45.

[0088] In some embodiments, the optical lens satisfies the following conditional expressions: 5 mm < f < 7 mm; 3 mm < EPD < 4 mm; 40 mm < TTL < 50 mm; 1.5 < Fno < 1.8; 18° < CRA < 23°; 3.5 mm < BFL < 6.5 mm; 130° < FOV < 160°; 13 mm < IH < 14 mm. In the above conditional expressions, f represents the effective focal length of the optical lens, EPD represents the entrance pupil diameter of the optical lens, TTL represents the total optical length of the optical lens, Fno represents the aperture value of the optical lens, CRA represents the chief ray angle of incidence of the optical lens, BFL represents the back focal length of the optical lens, FOV represents the maximum field angle of the optical lens, and IH represents the true image height corresponding to the maximum field angle of the optical lens. Meeting the above ranges, the optical lens has at least one or more advantages such as ultra-wide angle, large target surface, and large aperture. More specifically, 5.52 mm < f < 6.41 mm; 3.25 mm < EPD < 3.98 mm; 42.15 mm < TTL < 45.12 mm; 1.57 < Fno < 1.71; 18.25° < CRA < 22.55°; 3.98 mm < BFL < 6.11 mm; 137.9° < FOV < 152.5°; 13.61 mm < IH < 13.65 mm.

[0089] In some embodiments, the lens material in the optical lens provided by the present invention can be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. On the other hand, when the lens material is glass, the geometric chromatic aberration of the optical system can be effectively corrected by the low dispersion characteristic of the glass itself. The optical lens provided by the present invention can adopt an all-glass lens structure, which can reduce dispersion, effectively correct the chromatic aberration of the optical lens, and improve the imaging quality.

[0090] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens can adopt spherical lenses or aspherical lenses. Compared with the spherical structure, the aspherical structure can effectively reduce the aberration of the optical system, thereby reducing the number of lenses and the size of the lenses, and better realizing the miniaturization of the lens. More specifically, the fourth lens and the eighth lens of the present invention adopt aspherical lenses; the first lens, the second lens, the third lens, the fifth lens, the sixth lens, and the seventh lens adopt spherical lenses.

[0091] In various embodiments of the present invention, when the lens adopts an aspherical lens, the shapes of the aspherical surfaces of the optical lens satisfy the following equations:

[0092]

[0093] Where z is the distance between the surface and the vertex of the surface in the direction of the optical axis, h is the distance from the optical axis to the surface, c is the curvature of the vertex of the surface, K is the quadratic surface coefficient, and B, C, D, E, and F are the fourth, sixth, eighth, tenth, and twelfth order surface coefficients, respectively.

[0094] The present invention will be further described below with reference to several embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens are different; for specific differences, please refer to the parameter tables of each embodiment. The following embodiments are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be considered equivalent substitutions and are included within the protection scope of the present invention.

[0095] Example 1

[0096] Please see Figure 1 The diagram shows a schematic of the structure of the optical lens 100 provided in Embodiment 1 of the present invention. The optical lens 100 includes, along the optical axis from the object side to the imaging plane, the following components in sequence: a first lens L1, a second lens L2, a third lens L3, an aperture ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a filter G1, and a protective glass G2.

[0097] Among them, the first lens L1 has negative optical power, its object side S1 is convex, and its image side S2 is concave.

[0098] The second lens L2 has negative optical power, its object side S3 is concave, and its image side S4 is convex.

[0099] The third lens L3 has positive optical power, its object side S5 is convex, and its image side S6 is concave.

[0100] The fourth lens L4 has positive optical power, its object side S7 is convex, and its image side S8 is concave.

[0101] The fifth lens L5 has positive optical power, its object side S9 is convex, and its image side is concave.

[0102] The sixth lens L6 has negative optical power, its object side is convex, and its image side is concave.

[0103] The seventh lens L7 has positive optical power, its object side is convex, and its image side S12 is convex.

[0104] The fifth lens L5, the sixth lens L6 and the seventh lens L7 form a cemented lens group with positive optical power, that is, the cemented surface of the image side of the fifth lens L5 and the object side of the sixth lens is S10, and the cemented surface of the image side of the sixth lens L6 and the object side of the seventh lens L7 is S11.

[0105] The eighth lens L8 has positive optical power, its object side surface S13 is concave, and its image side surface S14 is convex.

[0106] The object-side surface S15 and the image-side surface S16 of filter G1 are both planar.

[0107] The object side S17 and image side S18 of the protective glass G2 are both flat.

[0108] The imaging plane S19 is a plane.

[0109] The fourth lens L4 and the eighth lens L8 are glass aspherical lenses; the first lens L1, the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are glass spherical lenses.

[0110] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0111] Table 1-1

[0112]

[0113] The surface profile parameters of the aspherical lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0114] Table 1-2

[0115] Face number K B C D E F S7 -1.20E+01 1.42E-03 -5.14E-05 2.07E-06 -4.96E-08 6.05E-10 S8 4.02E+01 1.14E-04 6.31E-07 1.52E-08 -3.81E-12 1.59E-11 S13 2.00E+02 -9.67E-04 -1.64E-05 1.36E-07 -3.23E-08 1.25E-10 S14 5.32E+01 -5.73E-04 -3.80E-06 1.82E-07 -4.71E-09 6.10E-11

[0116] Figure 2 The MTF (Modulation Transfer Function) curve of Example 1 is shown, which represents the lens imaging modulation at different spatial frequencies in various fields of view. The horizontal axis represents spatial frequency (unit: lp / mm), and the vertical axis represents MTF value. As can be seen from the figure, the MTF value of this example is above 0.3 throughout the entire field of view. Within the range of 0–160 lp / mm, the MTF curve decreases smoothly and uniformly from the center to the edge of the field of view, exhibiting good imaging quality and good detail resolution at both low and high frequencies.

[0117] Example 2

[0118] Please see Figure 3The figure shows a schematic diagram of the structure of the optical lens 200 provided in Embodiment 2 of the present invention. The main difference between this embodiment and Embodiment 1 is that the image side surface S14 of the seventh lens L7 is concave; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0119] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0120] Table 2-1

[0121]

[0122] The surface profile parameters of the aspherical lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0123] Table 2-2

[0124] Face number K B C D E F S7 -7.89E+00 1.44E-03 -4.94E-05 1.81E-06 -4.19E-08 4.64E-10 S8 -1.36E+02 1.42E-04 4.10E-07 -2.95E-08 9.42E-10 2.90E-11 S13 5.70E+01 -1.10E-03 -2.20E-05 4.59E-07 -7.54E-08 1.32E-09 S14 5.71E+01 -6.14E-04 -6.48E-06 2.53E-07 -5.56E-09 6.50E-11

[0125] from Figure 4 As can be seen, the MTF value of this embodiment is above 0.3 throughout the entire field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0126] Example 3

[0127] Please see Figure 5 The figure shows a schematic diagram of the structure of the optical lens 300 provided in Embodiment 3 of the present invention. The main difference between this embodiment and Embodiment 1 is that the image-side surface S6 of the third lens L3 is convex and the image-side surface S14 of the seventh lens L7 is concave. The optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0128] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0129] Table 3-1

[0130]

[0131] The surface profile parameters of the aspherical lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0132] Table 3-2

[0133] Face number K B C D E F S7 -7.28E+00 1.35E-03 -3.66E-05 1.20E-06 -2.35E-08 2.62E-10 S8 5.61E+01 1.51E-04 4.75E-07 1.46E-07 -5.09E-09 1.74E-10 S13 1.41E+02 -1.23E-03 -1.25E-05 -6.37E-07 1.24E-08 -6.43E-10 S14 4.60E+01 -8.37E-04 -5.03E-06 2.03E-07 -4.96E-09 5.16E-11

[0134] from Figure 6 As can be seen, the MTF value of this embodiment is above 0.3 throughout the entire field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0135] Example 4

[0136] Please see Figure 7 The figure shows a schematic diagram of the structure of the optical lens 400 provided in Embodiment 4 of the present invention. The main difference between this embodiment and Embodiment 1 is that the image side surface S6 of the third lens L3 is a convex surface; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0137] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0138] Table 4-1

[0139]

[0140] The surface profile parameters of the aspherical lens of the optical lens 400 in Example 4 are shown in Table 4-2.

[0141] Table 4-2

[0142] Face number K B C D E F S7 -7.79E+00 1.30E-03 -3.44E-05 1.31E-06 -3.00E-08 4.37E-10 S8 1.37E+02 1.51E-04 4.98E-07 2.78E-07 -1.17E-08 3.34E-10 S13 2.00E+02 -9.96E-04 -1.05E-05 -2.67E-07 6.04E-09 -3.81E-10 S14 9.76E+01 -7.80E-04 -3.36E-06 8.98E-08 -1.47E-09 -3.41E-12

[0143] from Figure 8 As can be seen, the MTF value of this embodiment is above 0.4 throughout the entire field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0144] Example 5

[0145] Please see Figure 9 The figure shows a schematic diagram of the structure of the optical lens 500 provided in Embodiment 5 of the present invention. The main difference between this embodiment and Embodiment 1 is that the image-side surface S8 of the fourth lens L4 is convex and the image-side surface S14 of the seventh lens L7 is concave. The optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0146] The relevant parameters of each lens in the optical lens 500 in Example 5 are shown in Table 5-1.

[0147] Table 5-1

[0148]

[0149] The surface profile parameters of the aspherical lens of the optical lens 500 in Example 5 are shown in Table 5-2.

[0150] Table 5-2

[0151] Face number K B C D E F S7 -1.96E+00 2.94E-04 2.05E-06 -3.18E-07 1.48E-08 -3.19E-10 S8 4.17E+01 8.04E-05 1.79E-06 -3.59E-07 1.58E-08 -3.53E-10 S13 2.00E+02 -1.22E-03 -2.01E-05 8.94E-08 -4.90E-08 9.24E-10 S14 5.34E+01 -6.61E-04 -4.38E-06 2.74E-07 -7.06E-09 1.10E-10

[0152] from Figure 10As can be seen, the MTF value of this embodiment is above 0.2 throughout the entire field of view, demonstrating good imaging quality and detail resolution in both low and high frequency conditions.

[0153] Example 6

[0154] Please see Figure 11 The figure shows a schematic diagram of the structure of the optical lens 600 provided in Embodiment 6 of the present invention. The main difference between this embodiment and Embodiment 1 is that the image-side surface S4 of the second lens L2 is concave, the image-side surface S6 of the third lens L3 is convex, and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0155] The relevant parameters of each lens in the optical lens 600 in Example 6 are shown in Table 6-1.

[0156] Table 6-1

[0157]

[0158] The surface profile parameters of the aspherical lens of the optical lens 600 in Example 6 are shown in Table 6-2.

[0159] Table 6-2

[0160] Face number K B C D E F S7 -7.69E+00 1.54E-03 -4.66E-05 1.72E-06 -3.67E-08 4.31E-10 S8 1.38E+02 2.30E-04 2.22E-06 1.94E-07 -8.21E-09 2.87E-10 S13 2.00E+02 -1.15E-03 -1.44E-05 -7.43E-08 -1.78E-08 1.30E-10 S14 2.13E+01 -8.34E-04 -2.54E-06 8.78E-08 -2.15E-09 2.52E-11

[0161] from Figure 12 As can be seen, the MTF value of this embodiment is above 0.2 throughout the entire field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0162] Example 7

[0163] Please see Figure 13 The figure shown is a schematic diagram of the structure of the optical lens 700 provided in Embodiment 7 of the present invention. The main difference between this embodiment and Embodiment 1 is that the image side surface S4 of the second lens L2 is concave; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0164] The relevant parameters of each lens in the optical lens 700 in Example 7 are shown in Table 7-1.

[0165] Table 7-1

[0166]

[0167] The surface profile parameters of the aspherical lens of the optical lens 700 in Example 7 are shown in Table 7-2.

[0168] Table 7-2

[0169] Face number K B C D E F S7 -1.35E+01 1.25E-03 -3.37E-05 1.35E-06 -2.84E-08 3.42E-10 S8 9.17E+01 3.73E-04 4.62E-06 1.15E-07 -2.47E-09 1.33E-10 S13 9.58E+00 -1.29E-03 -1.14E-05 -8.80E-07 2.43E-08 -1.23E-09 S14 1.70E+01 -7.50E-04 -1.55E-06 1.54E-07 -5.61E-09 7.55E-11

[0170] from Figure 14 As can be seen, the MTF value of this embodiment is above 0.25 throughout the entire field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0171] Example 8

[0172] Please see Figure 15 The figure shows a schematic diagram of the structure of the optical lens 800 provided in Embodiment 8 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the image-side surface S4 of the second lens L2 is concave; the image-side surface S6 of the third lens L3 is convex; the image-side surface S8 of the fourth lens L4 is convex; the image-side surface S14 of the seventh lens L7 is concave; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0173] The relevant parameters of each lens in the optical lens 800 in Example 8 are shown in Table 8-1.

[0174] Table 8-1

[0175]

[0176] The surface profile parameters of the aspherical lens of the optical lens 800 in Example 8 are shown in Table 8-2.

[0177] Table 8-2

[0178] Face number K B C D E F S7 -5.45E+00 9.81E-04 -2.24E-05 5.30E-07 -8.23E-09 6.11E-11 S8 1.09E+01 8.21E-05 1.05E-06 -3.65E-08 1.03E-09 -6.96E-12 S13 2.00E+02 -9.28E-04 -1.75E-05 4.41E-07 -4.10E-08 6.69E-10 S14 1.04E+02 -5.83E-04 -2.48E-06 5.12E-08 -2.58E-10 -4.62E-12

[0179] from Figure 16 As can be seen, the MTF value of this embodiment is above 0.4 throughout the entire field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0180] Example 9

[0181] Please see Figure 17 The figure shows a schematic diagram of the structure of the optical lens 900 provided in Embodiment 9 of the present invention. The main difference between this embodiment and Embodiment 1 is that the image-side surface S4 of the second lens L2 is concave; the image-side surface S14 of the seventh lens L7 is concave; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0182] The relevant parameters of each lens in the optical lens 900 in Example 9 are shown in Table 9-1.

[0183] Table 9-1

[0184]

[0185] The surface profile parameters of the aspherical lens of the optical lens 900 in Example 9 are shown in Table 9-2.

[0186] Table 9-2

[0187] Face number K B C D E F S7 -1.40E+01 1.23E-03 -4.04E-05 1.64E-06 -3.87E-08 4.87E-10 S8 5.68E+01 2.64E-04 3.28E-06 1.37E-07 -5.69E-09 2.36E-10 S13 1.78E+01 -1.25E-03 -1.61E-05 -8.02E-07 1.17E-09 -1.08E-09 S14 1.39E+02 -7.40E-04 -4.16E-06 1.16E-07 -3.00E-09 4.18E-11

[0188] from Figure 18 As can be seen, the MTF value of this embodiment is above 0.2 throughout the entire field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0189] Example 10

[0190] Please see Figure 19 The figure shown is a schematic diagram of the structure of the optical lens 1000 provided in Embodiment 10 of the present invention. The main difference between this embodiment and Embodiment 1 is that the image-side surface S4 of the second lens L2 is concave, the image-side surface S8 of the fourth lens L4 is convex, and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0191] The relevant parameters of each lens in the optical lens 1000 in Example 10 are shown in Table 10-1.

[0192] Table 10-1

[0193]

[0194] The surface profile parameters of the aspherical lens of the optical lens 1000 in Example 10 are shown in Table 10-2.

[0195] Table 10-2

[0196] Face number K B C D E F S7 -1.54E+01 1.67E-03 -9.47E-05 4.80E-06 -1.50E-07 2.31E-09 S8 5.23E+00 1.89E-04 3.18E-07 4.01E-07 -2.51E-08 8.39E-10 S13 2.00E+02 -1.38E-03 -2.41E-05 2.90E-07 -5.30E-08 1.01E-09 S14 1.52E+02 -8.72E-04 -5.15E-06 2.84E-07 -6.75E-09 1.16E-10

[0197] from Figure 20 As can be seen, the MTF value of this embodiment is above 0.2 throughout the entire field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0198] Example 11

[0199] Please see Figure 21 The figure shown is a schematic diagram of the structure of the optical lens 1100 provided in Embodiment 11 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the image-side surface S6 of the third lens L3 is convex; the image-side surface S8 of the fourth lens L4 is convex; the image-side surface S14 of the seventh lens L7 is concave; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0200] The relevant parameters of each lens in the optical lens 1100 in Example 11 are shown in Table 11-1.

[0201] Table 11-1

[0202]

[0203] The surface profile parameters of the aspherical lens of the optical lens 1100 in Example 11 are shown in Table 11-2.

[0204] Table 11-2

[0205] Face number K B C D E F S7 -4.94E+00 7.54E-04 -1.25E-05 2.51E-07 -3.28E-09 1.99E-11 S8 1.66E+00 7.81E-05 -3.58E-07 0.00E+00 0.00E+00 0.00E+00 S13 2.00E+02 -1.12E-03 -3.77E-05 2.74E-06 -2.22E-07 5.31E-09 S14 8.58E+01 -7.25E-04 -7.65E-06 3.47E-07 -9.32E-09 1.10E-10

[0206] from Figure 22 As can be seen, the MTF value of this embodiment is above 0.2 throughout the entire field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0207] Example 12

[0208] Please see Figure 23 The figure shown is a schematic diagram of the structure of the optical lens 1200 provided in Embodiment 12 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the image-side surface S4 of the second lens L2 is concave; the image-side surface S6 of the third lens L3 is convex; the image-side surface S14 of the seventh lens L7 is concave; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0209] The relevant parameters of each lens in the optical lens 1200 in Example 12 are shown in Table 12-1.

[0210] Table 12-1

[0211]

[0212] The surface profile parameters of the aspherical lens of the optical lens 1200 in Example 12 are shown in Table 12-2.

[0213] Table 12-2

[0214] Face number K B C D E F S7 -7.83E+00 1.59E-03 -5.00E-05 1.70E-06 -3.37E-08 3.37E-10 S8 7.90E+01 2.12E-04 3.50E-07 1.92E-07 -5.99E-09 1.91E-10 S13 -1.97E+02 -1.31E-03 -1.61E-05 -3.02E-07 -1.94E-08 2.97E-10 S14 -1.26E+02 -8.69E-04 -3.58E-06 1.62E-07 -3.61E-09 6.21E-11

[0215] from Figure 24 As can be seen, the MTF value of this embodiment is above 0.2 throughout the entire field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0216] Example 13

[0217] Please see Figure 25The figure shown is a schematic diagram of the structure of the optical lens 1300 provided in Embodiment 13 of the present invention. The main difference between this embodiment and Embodiment 1 is that the image side surface S4 of the second lens L2 is concave; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0218] The relevant parameters of each lens in the optical lens 1300 in Example 13 are shown in Table 13-1.

[0219] Table 13-1

[0220]

[0221] The surface profile parameters of the aspherical lens of the optical lens 1300 in Example 13 are shown in Table 13-2.

[0222] Table 13-2

[0223] Face number K B C D E F S7 -1.00E+00 5.69E-05 6.90E-07 2.32E-08 -1.31E-09 5.71E-11 S8 -4.21E+01 7.13E-05 -4.13E-07 1.28E-07 -5.89E-09 1.42E-10 S13 1.13E+02 -1.17E-03 -1.57E-05 -2.16E-07 -5.20E-09 -3.16E-10 S14 -1.04E+01 -8.43E-04 -6.78E-06 2.69E-07 -6.88E-09 7.08E-11

[0224] from Figure 26 As can be seen, the MTF value of this embodiment is above 0.2 throughout the entire field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0225] Example 14

[0226] Please see Figure 27 The figure shown is a schematic diagram of the structure of the optical lens 1400 provided in Embodiment 14 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the image-side surface S4 of the second lens L2 is concave; the image-side surface S6 of the third lens L3 is convex; the image-side surface S8 of the fourth lens L4 is convex; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0227] The relevant parameters of each lens in the optical lens 1400 in Example 14 are shown in Table 14-1.

[0228] Table 14-1

[0229]

[0230] The surface profile parameters of the aspherical lens of the optical lens 1400 in Example 14 are shown in Table 14-2.

[0231] Table 14-2

[0232] Face number K B C D E F S7 -1.15E+01 1.27E-03 -4.91E-05 1.91E-06 -4.59E-08 5.54E-10 S8 1.28E+01 1.87E-04 -5.22E-08 2.30E-07 -1.02E-08 2.54E-10 S13 -1.07E+01 -1.04E-03 -1.43E-05 -2.29E-08 -1.14E-08 4.44E-11 S14 1.17E+02 -7.08E-04 -3.88E-06 1.95E-07 -3.99E-09 3.88E-11

[0233] from Figure 28As can be seen, the MTF value of this embodiment is above 0.38 throughout the entire field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0234] Example 15

[0235] Please see Figure 29 The figure shown is a schematic diagram of the structure of the optical lens 1500 provided in Embodiment 15 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the image-side surface S4 of the second lens L2 is concave; the image-side surface S8 of the fourth lens L4 is convex; the image-side surface S14 of the seventh lens L7 is concave; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0236] The relevant parameters of each lens in the optical lens 1500 in Example 15 are shown in Table 15-1.

[0237] Table 15-1

[0238]

[0239] The surface profile parameters of the aspherical lens of the optical lens 1500 in Example 15 are shown in Table 15-2.

[0240] Table 15-2

[0241] Face number K B C D E F S7 -1.21E+01 1.82E-03 -1.00E-04 4.63E-06 -1.32E-07 1.59E-09 S8 8.37E+00 1.37E-04 3.26E-06 -2.72E-07 1.28E-08 -2.73E-10 S13 2.00E+02 -1.50E-03 -2.20E-05 -4.50E-07 -5.32E-08 8.96E-10 S14 3.76E+01 -8.85E-04 -3.48E-06 1.22E-07 -2.04E-09 5.76E-11

[0242] from Figure 30 As can be seen, the MTF value of this embodiment is above 0.25 throughout the entire field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0243] Please refer to Tables 16-1 and 16-2 for the optical characteristics corresponding to the above embodiments, including the effective focal length f, total optical length TTL, aperture value Fno, true image height IH corresponding to the maximum field of view, maximum field of view FOV, and the values ​​corresponding to each conditional expression in each embodiment.

[0244] Table 16-1

[0245]

[0246]

[0247] Table 16-2

[0248]

[0249]

[0250] In summary, the optical lens provided by the present invention employs eight lenses with specific optical power. Through specific surface shape matching and reasonable optical power distribution, it can improve the imaging quality of the optical lens, reduce aberrations, and enhance the imaging quality of the optical lens, giving the lens one or more advantages such as ultra-wide angle, large image plane, large aperture, and high imaging quality.

[0251] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0252] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An optical lens comprising eight lenses, characterized in that, 依次包括沿着光轴从物侧到成像面的部件: 具有负光焦度的第一透镜,其物侧面是凸面,其像侧面是凹面; 具有负光焦度的第二透镜,其物侧面是凹面; 具有正光焦度的第三透镜,其物侧面是凸面; 具有正光焦度的第四透镜,其物侧面是凸面; 具有正光焦度的第五透镜,其物侧面是凸面,其像侧面是凹面; 具有负光焦度的第六透镜,其物侧面是凸面,其像侧面是凹面; 具有正光焦度的第七透镜,其物侧面是凸面; 具有正光焦度的第八透镜,其物侧面是凹面,其像侧面是凸面; 其中,第五透镜的物侧面曲率半径R9与第五透镜的像侧面曲率半径R10满足:-0.8 < (R9 - R10) / (R9 + R10) < -0.4;第八透镜的物侧面曲率半径R15与第八透镜的像侧面曲率半径R16满足:0 < (R15 - R16) / (R15 + R16) < 0.7;第一透镜的物侧面通光口径d1、光学镜头的最大视场角所对应的真实像高IH与光学镜头的最大视场角FOV满足:0.33 < d1 / (IH / 2) / tan(FOV / 2) < 0.62;第四透镜、第五透镜、第六透镜、第七透镜和第八透镜的组合焦距f45678与光学镜头的有效焦距f满足:1.3 < f45678 / f < 2.4。 2. The optical lens according to claim 1, characterized in that, 光学镜头的光学总长TTL与光学镜头的有效焦距f满足:6.1 < TTL / f < 8.5;光学镜头的光学总长TTL与光学镜头的最大视场角所对应的真实像高IH满足:2.8 < TTL / IH < 3.5。 3. The optical lens according to claim 1, characterized in that, 光学镜头的最大视场角FOV与光学镜头的光圈值Fno满足:80° < FOV / Fno < 100°;光学镜头的最大视场角所对应的真实像高IH与光学镜头的入瞳直径EPD满足:3.1 < IH / EPD < 4.5。 4. The optical lens according to claim 1, characterized in that, 光学镜头的最大视场角所对应的真实像高IH与光学镜头的有效焦距f满足:1.9 < IH / f < 2.7;光学镜头的有效焦距f与光学镜头的后焦距BFL满足:0.63 < BFL / f < 1.01。 5. The optical lens according to claim 1, characterized in that, The radius of curvature R9 of the object side surface of the fifth lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: -0.7 < (R9 - R10) / (R9 + R10) < -0.49; the radius of curvature R15 of the object side surface of the eighth lens and the radius of curvature R16 of the image side surface of the eighth lens satisfy: 0.05 < (R15 - R16) / (R15 + R16) < 0.58; the combined focal length f45678 of the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens and the effective focal length f of the optical lens satisfy: 1.39 < f45678 / f < 2.

2.

6. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 1.7 < f4 / f < 3.6; the radius of curvature R7 of the object side surface of the fourth lens and the effective focal length f of the optical lens satisfy: 1.2 < R7 / f < 2.

7. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 2.3 < f5 / f < 6.8; the radius of curvature R9 of the object side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 1 < R9 / f < 2.3; the radius of curvature R10 of the image side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 5.5 < R10 / f < 8.

8. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -2 < f6 / f < -0.9; the radius of curvature R11 of the object side surface of the sixth lens and the effective focal length f of the optical lens satisfy: 5.5 < R11 / f < 8; the radius of curvature R12 of the image side surface of the sixth lens and the effective focal length f of the optical lens satisfy: 0.6 < R12 / f < 1.

2.

9. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 1.1 < f7 / f < 1.9; the radius of curvature R13 of the object side surface of the seventh lens and the effective focal length f of the optical lens satisfy: 0.6 < R13 / f < 1.

2.

10. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f8 of the eighth lens satisfy: 12 < f8 / f < 39; the radius of curvature R15 of the object side surface of the eighth lens and the effective focal length f of the optical lens satisfy: -40 < R15 / f < -4.5; the radius of curvature R16 of the image side surface of the eighth lens and the effective focal length f of the optical lens satisfy: -16.5 < R16 / f < -4.

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