Optical lens and electronic device

Abstract

The application provides an optical lens and an electronic device. The optical lens comprises, from a first side to a second side: a first lens with optical power, the second side of the first lens being concave; a second lens with negative optical power, the second side of the second lens being concave; a third lens with positive optical power, the second side of the third lens being convex; a fourth lens with negative optical power, the first side of the fourth lens being concave; a fifth lens with positive optical power, the second side of the fifth lens being convex; a sixth lens with positive optical power, the second side of the sixth lens being convex; a seventh lens with positive optical power, the first side of the seventh lens being convex, and the second side of the seventh lens being convex; and an eighth lens with positive optical power, the first side of the eighth lens being convex. The application solves the problem that the optical lens in the prior art cannot simultaneously meet the requirements of a long exit pupil position, small telecentricity, a long back focal length, high resolution, a small diameter, low sensitivity and low cost.

Description

Technical Field

[0001] This invention relates to the field of optical imaging equipment technology, and more specifically, to an optical lens and an electronic device. Background Technology

[0002] With the development of science and technology, more and more fields require optical lenses to act as "eyes," such as automotive, surveillance, projection, and industrial applications. The increasing demand and technological advancements have led to increasingly diverse requirements for the performance of optical lenses. For example, in projection optical lenses, also known as projection objectives, the chip surface used for imaging is usually called the object plane, and the projection surface is called the image plane. With the improvement of imaging unit pixels and the enhancement of projection effects, simple projection systems can no longer meet the higher imaging performance requirements.

[0003] Existing optical lenses suffer from various problems, such as: the short exit pupil required by current technology cannot meet the needs of lighting systems; the inability to achieve high telecentricity makes them unsuitable for telecentric lighting systems, resulting in low system efficiency; the inability of current technology to meet the back focal length requirements for lighting installations; the inability of existing object-side telecentric projection lenses to meet resolution requirements of 90 lp / mm or higher; the inability to simultaneously meet the requirements of small front and rear apertures and miniaturization; and the relaxation of component processing tolerances in current technology to reduce costs, resulting in low finished product yields and inability to meet resolution requirements.

[0004] In other words, existing optical lenses suffer from the problem of having a far exit pupil, small telecentricity, long back focal length, high resolution, small aperture, low sensitivity, and low cost, which are difficult to achieve simultaneously. Summary of the Invention

[0005] The main objective of this invention is to provide an optical lens and an electronic device to solve the problems of existing optical lenses, such as having a far exit pupil position, small telecentricity, long back focal length, high resolution, small aperture, low sensitivity, and low cost, which are difficult to achieve simultaneously.

[0006] To achieve the above objectives, according to one aspect of the present invention, an optical lens is provided, comprising, from a first side to a second side, the following components in sequence: a first lens having optical power, the second side of which is concave; a second lens having negative optical power, the second side of which is concave; a third lens having positive optical power, the second side of which is convex; a fourth lens having negative optical power, the first side of which is concave; a fifth lens having positive optical power, the second side of which is convex; a sixth lens having positive optical power, the second side of which is convex; a seventh lens having positive optical power, the first side of which is convex and the second side of which are both convex; and an eighth lens having positive optical power, the first side of which is convex.

[0007] Furthermore, the first lens has negative optical power, and the first side surface of the first lens is convex.

[0008] Furthermore, the first lens has negative optical power, and the first side surface of the first lens is concave.

[0009] Furthermore, the first lens has positive optical power, and the first side surface of the first lens is convex.

[0010] Furthermore, the first side surface of the second lens is convex.

[0011] Furthermore, the first side surface of the second lens is concave.

[0012] Furthermore, the first side surface of the third lens is convex.

[0013] Furthermore, the first side surface of the third lens is concave.

[0014] Furthermore, the second side surface of the fourth lens is concave.

[0015] Furthermore, the second side surface of the fourth lens is convex.

[0016] Furthermore, the first side surface of the fifth lens is convex.

[0017] Furthermore, the first side surface of the fifth lens is concave.

[0018] Furthermore, the first side surface of the sixth lens is concave.

[0019] Furthermore, the first side surface of the sixth lens is convex.

[0020] Furthermore, the second side surface of the eighth lens is convex.

[0021] Furthermore, the second side surface of the eighth lens is concave.

[0022] Furthermore, the second lens is cemented with the third lens to form a cemented doublet; and / or the fourth lens is cemented with the fifth lens to form a cemented doublet.

[0023] Furthermore, the optical lens also includes an aperture stop, which is positioned between the third lens and the fourth lens.

[0024] Furthermore, the total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the second side of the optical lens, satisfies the following condition with respect to the total focal length F of the optical lens: TTL / F≤6.1.

[0025] Furthermore, the total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the second side of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy the following: TTL / H / FOV≤0.48.

[0026] Furthermore, the total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the second side of the optical lens, satisfies the following condition with respect to the maximum aperture DMAX of the optical lens: TTL / DMAX≤6.

[0027] Furthermore, the lens group length of the optical lens, that is, the distance TL from the center of the first side of the first lens to the center of the second side of the last lens of the optical lens, satisfies the following condition with respect to the maximum aperture D1 of the first side of the first lens corresponding to the maximum field of view of the optical lens: TL / D1≥1.6.

[0028] Furthermore, the lens group length of the optical lens, that is, the distance TL from the center of the first side of the first lens to the center of the second side of the last lens of the optical lens, satisfies the following condition with respect to the maximum aperture D15 of the first side of the eighth lens corresponding to the maximum field of view of the optical lens: TL / D15≥1.1.

[0029] Furthermore, the image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian value θ of the maximum field of view of the optical lens satisfy the following relationship: |(HF*θ) / (F*θ)|≤0.09.

[0030] Furthermore, the optical back focal length of the optical lens, i.e., the distance BFL from the center of the second side of the last lens of the optical lens to the center of the second side of the optical lens, satisfies the following condition with respect to the optical total length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the second side of the optical lens: BFL / TTL≥0.26.

[0031] Furthermore, the optical back focal length of the optical lens, i.e., the distance BFL from the center of the second side of the last lens of the optical lens to the center of the second side of the optical lens, and the lens group length of the optical lens, i.e., the distance TL from the center of the first side of the first lens to the center of the second side of the last lens of the optical lens, satisfy the following condition: BFL / TL≥0.3.

[0032] Furthermore, the maximum field of view (FOV) of the optical lens, the total focal length (F) of the optical lens, and the image height (H) corresponding to the maximum field of view of the optical lens satisfy the following relationship: (FOV×F) / H≤65.

[0033] Furthermore, the total focal length F of the optical lens and the total focal length F of the optical lens relative to the exit pupil position EXPP of the second side satisfy the following condition: |F / EXPP|≤0.25.

[0034] Furthermore, the maximum aperture D16 of the second side of the eighth lens corresponding to the maximum field of view of the optical lens, the optical back focal length of the optical lens (i.e., the distance BFL from the center of the second side of the last lens of the optical lens to the center of the second side of the optical lens), and the image height H corresponding to the maximum field of view of the optical lens satisfy the following condition: D16*BFL / H≥45.

[0035] Furthermore, the focal length F8 of the eighth lens satisfies the following relationship with the total focal length F of the optical lens: F8 / F≥2.9.

[0036] Furthermore, the distance d7 from the aperture stop to the center of the doublet lens composed of the fourth and fifth lenses satisfies the following condition with respect to the length of the lens group of the optical lens, i.e., the distance TL from the center of the first side of the first lens to the center of the second side of the last lens of the optical lens: d7 / TL≥0.05.

[0037] Furthermore, the combined focal length F45 of the fourth and fifth lenses satisfies the following relationship with the total focal length F of the optical lens: |F45| / F≥1.

[0038] Furthermore, the focal length F6 of the sixth lens and the focal length F7 of the seventh lens satisfy the following condition: 0.5 ≤ F6 / F7 ≤ 1.2.

[0039] Furthermore, the focal length F7 of the seventh lens and the focal length F8 of the eighth lens satisfy the following condition: 0.3≤F7 / F8≤1.5.

[0040] Furthermore, the minimum center thickness dn and the maximum center thickness dm of the first to eighth lenses satisfy the following condition: 0.28 ≤ dn / dm.

[0041] Furthermore, the focal length F5 of the fifth lens satisfies the following relationship with the total focal length F of the optical lens: |F5 / F|≤4.

[0042] Furthermore, the focal length F6 of the sixth lens satisfies the following relationship with the total focal length F of the optical lens: |F6 / F|≤7.

[0043] Furthermore, the total focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy the following relationship: F / ENPD < 4.

[0044] Furthermore, the radius of curvature R8 of the second side of the fourth lens and the optical back focal length of the optical lens, i.e., the distance BFL from the center of the second side of the last lens of the optical lens to the center of the second side of the optical lens, satisfy the following condition: |BEL / R8|≥0.6.

[0045] Furthermore, the radius of curvature R8 of the second side of the fourth lens satisfies the following relationship with the total focal length F of the optical lens: R8 / F≥-2.5.

[0046] According to another aspect of the present invention, an optical lens is provided, comprising, from a first side to a second side, the following in sequence: a first lens having optical power; a second lens having negative optical power; a third lens having positive optical power; a fourth lens having negative optical power; a fifth lens having positive optical power; a sixth lens having positive optical power; a seventh lens having positive optical power; and an eighth lens having positive optical power; wherein the total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the second side of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens, satisfy the following relationship with the maximum field of view FOV of the optical lens: TTL / H / FOV ≤ 0.48.

[0047] Furthermore, the first lens has negative optical power, and the first side surface of the first lens is convex and the second side surface is concave.

[0048] Furthermore, the first lens has negative optical power, and the first side surface of the first lens is concave, and the second side surface is concave.

[0049] Furthermore, the first lens has positive optical power, and the first side surface of the first lens is convex and the second side surface is concave.

[0050] Furthermore, the first side surface of the second lens is convex, and the second side surface is concave.

[0051] Furthermore, the first side surface of the second lens is concave, and the second side surface is concave.

[0052] Furthermore, the first side surface of the third lens is convex, and the second side surface is convex.

[0053] Furthermore, the first side of the third lens is concave, and the second side is convex.

[0054] Furthermore, the first side surface of the fourth lens is concave, and the second side surface is concave.

[0055] Furthermore, the first side of the fourth lens is concave, and the second side is convex.

[0056] Furthermore, the first side surface of the fifth lens is convex, and the second side surface is convex.

[0057] Furthermore, the first side of the fifth lens is concave, and the second side is convex.

[0058] Furthermore, the first side of the sixth lens is concave, and the second side is convex.

[0059] Furthermore, the first side surface of the sixth lens is convex, and the second side surface is convex.

[0060] Furthermore, the first side surface of the seventh lens is convex, and the second side surface is convex.

[0061] Furthermore, the first side surface of the eighth lens is convex, and the second side surface is convex.

[0062] Furthermore, the first side surface of the eighth lens is convex, and the second side surface is concave.

[0063] Furthermore, the second lens is cemented with the third lens to form a cemented doublet; and / or the fourth lens is cemented with the fifth lens to form a cemented doublet.

[0064] Furthermore, the optical lens also includes an aperture stop, which is positioned between the third lens and the fourth lens.

[0065] Furthermore, the total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the second side of the optical lens, satisfies the following condition with respect to the total focal length F of the optical lens: TTL / F≤6.1.

[0066] Furthermore, the total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the second side of the optical lens, satisfies the following condition with respect to the maximum aperture DMAX of the optical lens: TTL / DMAX≤6.

[0067] Furthermore, the lens group length of the optical lens, that is, the distance TL from the center of the first side of the first lens to the center of the second side of the last lens of the optical lens, satisfies the following condition with respect to the maximum aperture D1 of the first side of the first lens corresponding to the maximum field of view of the optical lens: TL / D1≥1.6.

[0068] Furthermore, the lens group length of the optical lens, that is, the distance TL from the center of the first side of the first lens to the center of the second side of the last lens of the optical lens, satisfies the following condition with respect to the maximum aperture D15 of the first side of the eighth lens corresponding to the maximum field of view of the optical lens: TL / D15≥1.1.

[0069] Furthermore, the image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian value θ of the maximum field of view of the optical lens satisfy the following relationship: |(HF*θ) / (F*θ)|≤0.09.

[0070] Furthermore, the optical back focal length of the optical lens, i.e., the distance BFL from the center of the second side of the last lens of the optical lens to the center of the second side of the optical lens, satisfies the following condition with respect to the optical total length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the second side of the optical lens: BFL / TTL≥0.26.

[0071] Furthermore, the optical back focal length of the optical lens, i.e., the distance BFL from the center of the second side of the last lens of the optical lens to the center of the second side of the optical lens, and the lens group length of the optical lens, i.e., the distance TL from the center of the first side of the first lens to the center of the second side of the last lens of the optical lens, satisfy the following condition: BFL / TL≥0.3.

[0072] Furthermore, the maximum field of view (FOV) of the optical lens, the total focal length (F) of the optical lens, and the image height (H) corresponding to the maximum field of view of the optical lens satisfy the following relationship: (FOV×F) / H≤65.

[0073] Furthermore, the total focal length F of the optical lens and the total focal length F of the optical lens relative to the exit pupil position EXPP of the second side satisfy the following condition: |F / EXPP|≤0.25.

[0074] Furthermore, the maximum aperture D16 of the second side of the eighth lens corresponding to the maximum field of view of the optical lens, the optical back focal length of the optical lens (i.e., the distance BFL from the center of the second side of the last lens of the optical lens to the center of the second side of the optical lens), and the image height H corresponding to the maximum field of view of the optical lens satisfy the following condition: D16*BFL / H≥45.

[0075] Furthermore, the focal length F8 of the eighth lens satisfies the following relationship with the total focal length F of the optical lens: F8 / F≥2.9.

[0076] Furthermore, the distance d7 from the aperture stop to the center of the doublet lens composed of the fourth and fifth lenses satisfies the following condition with respect to the length of the lens group of the optical lens, i.e., the distance TL from the center of the first side of the first lens to the center of the second side of the last lens of the optical lens: d7 / TL≥0.05.

[0077] Furthermore, the combined focal length F45 of the fourth and fifth lenses satisfies the following relationship with the total focal length F of the optical lens: |F45| / F≥1.

[0078] Furthermore, the focal length F6 of the sixth lens and the focal length F7 of the seventh lens satisfy the following condition: 0.5 ≤ F6 / F7 ≤ 1.2.

[0079] Furthermore, the focal length F7 of the seventh lens and the focal length F8 of the eighth lens satisfy the following condition: 0.3≤F7 / F8≤1.5.

[0080] Furthermore, the minimum center thickness dn and the maximum center thickness dm of the first to eighth lenses satisfy the following condition: 0.28 ≤ dn / dm.

[0081] Furthermore, the focal length F5 of the fifth lens satisfies the following relationship with the total focal length F of the optical lens: |F5 / F|≤4.

[0082] Furthermore, the focal length F6 of the sixth lens satisfies the following relationship with the total focal length F of the optical lens: |F6 / F|≤7.

[0083] Furthermore, the total focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy the following relationship: F / ENPD < 4.

[0084] Furthermore, the radius of curvature R8 of the second side of the fourth lens and the optical back focal length of the optical lens, i.e., the distance BFL from the center of the second side of the last lens of the optical lens to the center of the second side of the optical lens, satisfy the following condition: |BEL / R8|≥0.6.

[0085] Furthermore, the radius of curvature R8 of the second side of the fourth lens satisfies the following relationship with the total focal length F of the optical lens: R8 / F≥-2.5.

[0086] According to another aspect of the present invention, an electronic device is provided, including the aforementioned optical lens and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

[0087] According to the technical solution of this invention, the optical lens sequentially includes, from the first side to the second side, a first lens with optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, a sixth lens with positive optical power, a seventh lens with positive optical power, and an eighth lens with positive optical power. The second side of the first lens is concave; the second side of the second lens is concave; the second side of the third lens is convex; the first side of the fourth lens is concave; the second side of the fifth lens is convex; the second side of the sixth lens is convex; the first side of the seventh lens is convex, and the second side is convex; the first side of the eighth lens is convex.

[0088] The first lens can have either positive or negative optical power. Its first side can be either convex or concave, while its second side is concave. When the first lens has negative optical power and its first side is convex, the optical power is negative, which diverges light. Its convex shape towards the first side helps collect more light from a large field of view into the subsequent optical system, increasing luminous flux. The greater curvature of the first side helps reduce distortion. The concave second side controls the direction of large-angle light rays at the lens edge, and the light emitted from the second side provides a larger light-receiving surface for the subsequent optical system. The convex-concave shape is symmetrical to the convex-concave shape of the sixth lens, further reducing distortion. The convex design of the first side facilitates the sliding of water droplets in practical applications, reducing their impact on imaging. When the first lens has negative optical power and its first side is concave, the spherical lens with negative optical power adjusts the angle of light rays, ensuring a smooth transition of light rays to the rear and correcting system distortion. The concave first side further diverges the light, further smoothing the transition and reducing system aberrations. When the first lens has positive optical power and the first side is convex, the first side is designed to be convex, which has the function of converging light. The convex design of the first side facilitates the collection of light over a wide area, and the entry of a large amount of light helps to improve the overall light transmission and illumination of the optical lens. At the same time, the second side is concave, which provides a larger receiving surface for light, so that the light transitioning to the rear is not too sensitive, which plays a certain role in improving resolution.

[0089] The second lens has negative optical power. Its first side can be either convex or concave, while its second side is concave. When the first side is convex, the negative optical power further diverges the light, and combined with the concave second side, it can collect as much light as possible from a large field of view into the rear optical system, allowing the diverged light to smoothly enter the rear and further smoothing the light path transition. When the first side is concave, combined with negative optical power, it facilitates appropriate light diffusion, resulting in a smoother light path transition, less light deflection, reduced light energy loss, and improved illumination at the edges of the field of view. The double-concave design further diverges the light, adjusts the light refraction angle, reduces chromatic aberration, and helps reduce system sensitivity.

[0090] The third lens has positive optical power. Its first side can be either convex or concave, while its second side is convex. When the first side of the third lens is convex, the positive optical power converges and adjusts the light, ensuring a smooth transition of light rays to the rear. The third lens is located near the aperture stop and has a biconvex shape with similar curvature on both sides, which helps collect more light and increases the system's light transmission capacity. When the first side of the third lens is concave, the combination of the concave and convex shapes with the preceding biconcave negative optical power lens facilitates a smooth light transition and effectively corrects chromatic aberration.

[0091] The fourth lens has negative optical power. Its first side is concave, while its second side can be either concave or convex. When the second side is concave, the optical power is negative, which disperses the central and peripheral rays in each field of view, enlarging the aperture and increasing system illumination. It also facilitates the correction of aberrations in the central and peripheral rays, achieving high resolution. Combined with the concave first side, which collects light entering through the third lens, the concave second side helps regulate peripheral aberrations, further improving resolution. When the second side is convex, this negative-power lens, with its concave-convex shape, works in conjunction with the subsequent concave-convex, positive-power fifth lens to correct chromatic aberration.

[0092] The fifth lens has positive optical power. Its first side can be either convex or concave, while its second side is convex. When the first side of the fifth lens is convex, it is a positive optical power lens, which facilitates light convergence. Its biconvex shape allows diverging light to smoothly enter the rear, further smoothing the light path transition. Its biconvex shape, combined with the biconcave negative optical power of the preceding fourth lens, helps correct chromatic aberration. When the first side of the fifth lens is concave, it is a negative optical power lens. Its concave-convex shape, combined with the concave-convex positive optical power of the preceding fourth lens, corrects chromatic aberration and constricts diffused light, which helps reduce the system aperture.

[0093] The sixth lens has positive optical power. Its first side can be either concave or convex, while its second side is convex. When the first side of the sixth lens is concave, it has positive optical power, converging the light rays. Combined with the convex second side, this helps compress the light collected at the front end, achieving a small field of view (FNO) and effectively reducing system CRA, thus improving relative illumination. When the first side of the sixth lens is convex, it becomes a biconvex lens with positive optical power, which helps compress the light collected at the front end, deflecting the light rays along the optical axis to reduce the angle at which the light rays are incident on the imaging plane, achieving a small FNO, effectively reducing system CRA, and improving relative illumination.

[0094] The seventh lens has positive optical power. Both its first and second sides are convex. This positive optical power lens optimizes the system's telecentricity and corrects system distortion, making the system an object-side telecentric system. The biconvex shape also helps reduce the rear port diameter.

[0095] The eighth lens has positive optical power. Its first side is convex, while its second side can be either convex or concave. When the second side of the eighth lens is convex, it is a positive optical power lens, optimizing the system's telecentricity. Adjusting the lens shape to biconvex ensures a smooth transition of light rays to the rear, reducing system sensitivity. The convex rear surface facilitates structural design and prevents edge interference during focusing. When the second side of the eighth lens is concave, it is a positive optical power lens, optimizing the system's telecentricity to make the system an object-side telecentric system. The convex rear surface also facilitates structural design and prevents edge interference during focusing.

[0096] This application employs eight lenses. By optimizing the optical power and surface shape of each lens, the optical lens of this invention has at least one beneficial effect, such as long back focal length, small telecentricity, high resolution, good temperature performance, high light transmission, small aperture, low sensitivity, and high mass production yield. Attached Figure Description

[0097] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0098] Figure 1 A schematic diagram of the structure of an optical lens of Example 1 of the present invention is shown;

[0099] Figure 2 A schematic diagram of the structure of the optical lens of Example 2 of the present invention is shown;

[0100] Figure 3 A schematic diagram of the structure of the optical lens of Example 3 of the present invention is shown;

[0101] Figure 4 A schematic diagram of the structure of the optical lens of Example 4 of the present invention is shown;

[0102] Figure 5 A schematic diagram of the structure of the optical lens of Example 5 of the present invention is shown;

[0103] Figure 6 A schematic diagram of the structure of the optical lens of Example Six of the present invention is shown;

[0104] Figure 7 A schematic diagram of the structure of the optical lens of Example Seven of the present invention is shown;

[0105] Figure 8 A schematic diagram of the structure of the optical lens of Example 8 of the present invention is shown;

[0106] Figure 9 A schematic diagram of the structure of the optical lens of Example 9 of the present invention is shown;

[0107] Figure 10 A schematic diagram of the structure of the optical lens of Example 10 of the present invention is shown. Detailed Implementation

[0108] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0109] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0110] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0111] 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 this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0112] 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 drawn strictly to scale.

[0113] In this paper, 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 first side is called the first side surface of the lens, and the surface of each lens closest to the second side is called the second side surface of the lens. The surface shape in the paraxial region can be determined according to the judgment method commonly known in the field, using the R value (R refers to the radius of curvature of the paraxial region, usually the R value in the lens database of optical software) to determine concavity or convexity. For the first side surface, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the second side surface, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0114] It should be noted that the left side of the optical lens is the first side, and the right side of the optical lens is the second side.

[0115] In an exemplary embodiment, the optical lens provided in this application can be used as a vehicle-mounted lens. For a vehicle-mounted lens, the left side is the object side, and the right side is the image side; the first side is also the object side, and the second side is also the image side. Light rays from the object side can form an image on the image side.

[0116] When the optical lens of this application is applied to a projection lens or a radar transmitting lens, the left side is the imaging side and the right side is the image source side. In an exemplary embodiment, the optical lens provided by this application can be used as, for example, a projection lens or a lidar transmitting lens. In this case, the image side of the optical lens can be the image source side, and the object side can be the imaging side. Light from the image source side can be imaged on the imaging side.

[0117] Specifically, the optical lens of this application is used in an object-side telecentric projection lens. The second side of the optical lens is the image source surface, and the first side of the optical lens is the imaging surface.

[0118] To address the challenges of existing optical lenses in achieving simultaneously high exit pupil position, small telecentricity, long back focal length, high resolution, small aperture, low sensitivity, and low cost, this invention provides an optical lens and an electronic device.

[0119] Example 1

[0120] like Figures 1 to 10 As shown, the optical lens, from the first side to the second side, includes a first lens with optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, a sixth lens with positive optical power, a seventh lens with positive optical power, and an eighth lens with positive optical power. The second side of the first lens is concave; the second side of the second lens is concave; the second side of the third lens is convex; the first side of the fourth lens is concave; the second side of the fifth lens is convex; the second side of the sixth lens is convex; the first side of the seventh lens is convex, and the second side is convex; the first side of the eighth lens is convex.

[0121] The first lens can have either positive or negative optical power. Its first side can be either convex or concave, while its second side is concave. When the first lens has negative optical power and its first side is convex, the optical power is negative, which diverges light. Its convex shape towards the first side helps collect more light from a large field of view into the subsequent optical system, increasing luminous flux. The greater curvature of the first side helps reduce distortion. The concave second side controls the direction of large-angle light rays at the lens edge, and the light emitted from the second side provides a larger light-receiving surface for the subsequent optical system. The convex-concave shape is symmetrical to the convex-concave shape of the sixth lens, further reducing distortion. The convex design of the first side facilitates the sliding of water droplets in practical applications, reducing their impact on imaging. When the first lens has negative optical power and its first side is concave, the spherical lens with negative optical power adjusts the angle of light rays, ensuring a smooth transition of light rays to the rear and correcting system distortion. The concave first side further diverges the light, further smoothing the transition and reducing system aberrations. When the first lens has positive optical power and the first side is convex, the first side is designed to be convex, which has the function of converging light. The convex design of the first side facilitates the collection of light over a wide area, and the entry of a large amount of light helps to improve the overall light transmission and illumination of the optical lens. At the same time, the second side is concave, which provides a larger receiving surface for light, so that the light transitioning to the rear is not too sensitive, which plays a certain role in improving resolution.

[0122] The second lens has negative optical power. Its first side can be either convex or concave, while its second side is concave. When the first side is convex, the negative optical power further diverges the light, and combined with the concave second side, it can collect as much light as possible from a large field of view into the rear optical system, allowing the diverged light to smoothly enter the rear and further smoothing the light path transition. When the first side is concave, combined with negative optical power, it facilitates appropriate light diffusion, resulting in a smoother light path transition, less light deflection, reduced light energy loss, and improved illumination at the edges of the field of view. The double-concave design further diverges the light, adjusts the light refraction angle, reduces chromatic aberration, and helps reduce system sensitivity.

[0123] The third lens has positive optical power. Its first side can be either convex or concave, while its second side is convex. When the first side of the third lens is convex, the positive optical power converges and adjusts the light, ensuring a smooth transition of light rays to the rear. The third lens is located near the aperture stop and has a biconvex shape with similar curvature on both sides, which helps collect more light and increases the system's light transmission capacity. When the first side of the third lens is concave, the combination of the concave and convex shapes with the preceding biconcave negative optical power lens facilitates a smooth light transition and effectively corrects chromatic aberration.

[0124] The fourth lens has negative optical power. Its first side is concave, while its second side can be either concave or convex. When the second side is concave, the optical power is negative, which disperses the central and peripheral rays in each field of view, enlarging the aperture and increasing system illumination. It also facilitates the correction of aberrations in the central and peripheral rays, achieving high resolution. Combined with the concave first side, which collects light entering through the third lens, the concave second side helps regulate peripheral aberrations, further improving resolution. When the second side is convex, this negative-power lens, with its concave-convex shape, works in conjunction with the subsequent concave-convex, positive-power fifth lens to correct chromatic aberration.

[0125] The fifth lens has positive optical power. Its first side can be either convex or concave, while its second side is convex. When the first side of the fifth lens is convex, it is a positive optical power lens, which facilitates light convergence. Its biconvex shape allows diverging light to smoothly enter the rear, further smoothing the light path transition. Its biconvex shape, combined with the biconcave negative optical power of the preceding fourth lens, helps correct chromatic aberration. When the first side of the fifth lens is concave, it is a negative optical power lens. Its concave-convex shape, combined with the concave-convex positive optical power of the preceding fourth lens, corrects chromatic aberration and constricts diffused light, which helps reduce the system aperture.

[0126] The sixth lens has positive optical power. Its first side can be either concave or convex, while its second side is convex. When the first side of the sixth lens is concave, it has positive optical power, converging the light rays. Combined with the convex second side, this helps compress the light collected at the front end, achieving a small field of view (FNO) and effectively reducing system CRA, thus improving relative illumination. When the first side of the sixth lens is convex, it becomes a biconvex lens with positive optical power, which helps compress the light collected at the front end, deflecting the light rays along the optical axis to reduce the angle at which the light rays are incident on the imaging plane, achieving a small FNO, effectively reducing system CRA, and improving relative illumination.

[0127] The seventh lens has positive optical power. Both its first and second sides are convex. This positive optical power lens optimizes the system's telecentricity and corrects system distortion, making the system an object-side telecentric system. The biconvex shape also helps reduce the rear port diameter.

[0128] The eighth lens has positive optical power. Its first side is convex, while its second side can be either convex or concave. When the second side of the eighth lens is convex, it is a positive optical power lens, optimizing the system's telecentricity. Adjusting the lens shape to biconvex ensures a smooth transition of light rays to the rear, reducing system sensitivity. The convex rear surface facilitates structural design and prevents edge interference during focusing. When the second side of the eighth lens is concave, it is a positive optical power lens, optimizing the system's telecentricity to make the system an object-side telecentric system. The convex rear surface also facilitates structural design and prevents edge interference during focusing.

[0129] This application employs eight lenses. By optimizing the optical power and surface shape of each lens, the optical lens of this invention has at least one beneficial effect, such as long back focal length, small telecentricity, high resolution, good temperature performance, high light transmission, small aperture, low sensitivity, and high mass production yield.

[0130] In this embodiment, the first lens has negative optical power, and its first side surface is convex. The negative optical power diverges light rays, and the convex shape helps collect more light from a large field of view into the subsequent optical system, increasing luminous flux. The significant curvature of the first side surface helps reduce distortion. The second side surface is concave, which controls the direction of large-angle light rays at the lens edge. Light rays exiting the second side surface provide a larger light-receiving surface for the subsequent optical system. The convex-concave shape is symmetrical to the convex-concave shape of the sixth lens, further reducing distortion. The convex design of the first side surface facilitates the sliding of water droplets in practical applications, reducing their impact on imaging.

[0131] In this embodiment, the first lens has negative optical power, and the first side surface of the first lens is concave. When the first lens has negative optical power and the first side surface is concave, the spherical lens with negative optical power adjusts the angle of light rays, making the light rays transition smoothly to the rear and correcting system distortion; the concave first side surface further diverges the light rays, making the light rays transition even more smoothly, which helps to reduce system aberrations.

[0132] In this embodiment, the first lens has positive optical power, and its first side surface is convex. When the first lens has positive optical power and its first side surface is convex, the convex design of the first side surface has the function of converging light. The convex design of the first side surface facilitates the collection of light over a wide area, and the entry of a large amount of light helps to improve the overall light transmission and illumination of the optical lens. At the same time, the second side surface is concave, providing a larger receiving surface for light, so that the light transitioning to the rear is not too sensitive, which plays a certain role in improving resolution.

[0133] In this embodiment, the first side of the second lens is convex. The negative optical power further diverges the light, and combined with the concave surface of the second side, it can collect as much light as possible from a large field of view into the rear optical system, allowing the diverged light to smoothly enter the rear and further smoothing the transition of the light path.

[0134] In this embodiment, the first side of the second lens is concave. Combined with negative optical power, this facilitates proper light diffusion, resulting in a smoother light path transition, less light deflection, reduced light energy loss, and improved illumination at the edge of the field of view. The double-concave shape further diffuses the light, adjusts the light refraction angle, reduces chromatic aberration, and helps reduce system sensitivity.

[0135] In this embodiment, the first side surface of the third lens is convex. When the first side surface of the third lens is convex, the positive optical power converges the light and adjusts the light so that the light path smoothly transitions to the rear. The third lens is close to the aperture stop and has a biconvex surface with similar curvature on both sides, which helps to collect more light and increase the light transmission capability of the system.

[0136] In this embodiment, the first side surface of the third lens is concave. When the first side surface of the third lens is concave, the combination of the concave-convex surface with the preceding biconcave negative power lens is beneficial for a smooth transition of light and can effectively correct chromatic aberration.

[0137] In this embodiment, the second side surface of the fourth lens is concave. When the second side surface of the fourth lens is concave, the optical power is negative, which can disperse the central and peripheral rays of each field of view, enlarge the aperture, increase the system illumination, and facilitate the correction of aberrations between peripheral and central rays to achieve high resolution. Combined with the first side surface being concave to collect the light entering through the third lens, the design of the second side surface being concave plays a certain role in regulating peripheral ray aberrations, thereby improving the resolution.

[0138] In this embodiment, the second side of the fourth lens is convex. A negative power lens, with a concave-convex shape, is used in conjunction with a subsequent concave-convex positive power fifth lens to correct chromatic aberration.

[0139] In this embodiment, the first side of the fifth lens is convex. The positive power lens facilitates light convergence, and its biconvex shape allows diverging light to smoothly enter the rear, further smoothing the light path transition. Furthermore, its biconvex shape, combined with the biconcave negative power of the preceding fourth lens, is cemented together to correct chromatic aberration.

[0140] In this embodiment, the first side of the fifth lens is concave. The negative power lens, with its concave-convex shape, works in conjunction with the preceding concave-convex positive power fourth lens to correct chromatic aberration and reduce diffused light, which helps to reduce the system aperture.

[0141] In this embodiment, the first side surface of the sixth lens is concave. When the first side surface of the sixth lens is concave, it improves optical power and focuses the light. At the same time, by setting the second side surface to be convex, it helps to compress the light collected at the front end, achieve a small FNO, and effectively reduce system CRA, thereby improving relative illumination.

[0142] In this embodiment, the first side surface of the sixth lens is convex. When the first side surface of the sixth lens is convex, the positive optical power biconvex lens is beneficial for compressing the light collected at the front end, causing the light to bend towards the optical axis, thereby reducing the angle at which the light is incident on the imaging plane, achieving a small FNO, and effectively reducing the system CRA and improving relative illumination.

[0143] In this embodiment, the second side surface of the eighth lens is convex. When the second side surface of the eighth lens is convex, it is a positive power lens, which optimizes the telecentricity of the system. The lens shape is adjusted to be biconvex so that the light path transitions smoothly to the rear, reducing the system sensitivity. The convex rear surface is beneficial to the structural design and prevents edge structure interference during focusing.

[0144] In this embodiment, the second side surface of the eighth lens is concave. When the second side surface of the eighth lens is concave, it is a positive power lens, optimizes the telecentricity of the system, and makes the system an object-side telecentric system. The convex rear surface is beneficial to the structural design and prevents edge structure interference during focusing.

[0145] In this embodiment, the second lens and the third lens are cemented together to form a cemented doublet; and / or the fourth lens and the fifth lens are cemented together to form a cemented doublet. That is, in this embodiment, only the second lens and the third lens may be cemented together to form a cemented doublet, or only the fourth lens and the fifth lens may be cemented together to form a cemented doublet, or both the second and third lenses may be cemented together to form a cemented doublet, and the fourth and fifth lenses may be cemented together to form a cemented doublet. The use of cemented doublets can effectively eliminate the influence of ghosting on the optical lens and correct chromatic aberration, allowing the optical lens to maintain high resolution while eliminating ghosting. The negative power fourth lens is paired with the subsequent positive power sixth lens to correct chromatic aberration. The fourth lens in a cemented doublet, with its negative optical power, has a higher refractive index (compared to the fifth lens with positive optical power), allowing light to converge effectively and smoothly at the final point, ensuring a stable arrival of light at the imaging surface and reducing overall weight and cost. It also reduces light loss caused by inter-lens reflections. The combination of high and low refractive indices facilitates a rapid transition of light from the front, increasing the aperture and light transmission, which is beneficial for high-efficiency projection. Furthermore, the use of a cemented doublet reduces the air gap between the two lenses, resulting in a more compact overall optical system structure and reducing tolerance sensitivity issues such as overall eccentricity of the lens units during assembly.

[0146] In this embodiment, the optical lens also includes an aperture stop, which is disposed between the third lens and the fourth lens. Positioning the aperture stop between the third and fourth lenses, and placing it in the middle, facilitates effective light convergence entering the optical system, reduces the lens apertures at both ends of the optical system, adjusts the telecentricity of the optical lens, and reduces the system's assembly sensitivity.

[0147] In this embodiment, the total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the second side of the optical lens, satisfies the condition TTL / F ≤ 6.1 with respect to the total focal length F of the optical lens. Controlling this condition allows the optical lens to have better performance and meets the requirements for miniaturization. Preferably, TTL / F ≤ 5.42.

[0148] In this embodiment, the total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the second side of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy the following condition: TTL / H / FOV ≤ 0.48. Satisfying this condition helps to ensure the miniaturization of the optical system, reduces the size of the optical engine, and optimizes the size layout. Preferably, TTL / H / FOV ≤ 0.3.

[0149] In this embodiment, the total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the second side of the optical lens, satisfies the following condition with respect to the maximum aperture DMAX of the optical lens: TTL / DMAX ≤ 6. A smaller TTL / DMAX results in a more compact and smaller optical lens. Preferably, TTL / DMAX ≤ 4.7.

[0150] In this embodiment, the lens group length of the optical lens, i.e., the distance TL from the center of the first side of the first lens to the center of the second side of the last lens of the optical lens, satisfies the condition TL / D1 ≥ 1.6 with respect to the maximum aperture D1 of the first side of the first lens corresponding to the maximum field of view of the optical lens. Satisfying this condition ensures a small front aperture, enabling miniaturization. Preferably, TL / D1 ≥ 2.2.

[0151] In this embodiment, the lens group length of the optical lens, i.e., the distance TL from the center of the first side of the first lens to the center of the second side of the last lens of the optical lens, satisfies the condition TL / D15 ≥ 1.1 with respect to the maximum aperture of the first side of the eighth lens corresponding to the maximum field of view of the optical lens. Satisfying this condition ensures a small rear aperture, enabling miniaturization. Preferably, TL / D15 ≥ 1.4.

[0152] In this embodiment, the image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian value θ of the maximum field of view of the optical lens satisfy the condition: |(HF*θ) / (F*θ)|≤0.09. Controlling this condition ensures that, while keeping the field of view and image plane size constant, increasing the focal length of the optical lens enhances the imaging effect in the central region of the image plane. Preferably, |(HF*θ) / (F*θ)|≤0.076.

[0153] In this embodiment, the optical back focal length (BFL), i.e., the distance from the center of the second side of the last lens of the optical lens to the center of the second side surface of the optical lens, satisfies the condition that BFL / TTL ≥ 0.26 with respect to the total optical length of the optical lens (TTL), i.e., the distance from the center of the first side of the first lens to the center of the second side surface of the optical lens. Satisfying this condition allows for miniaturization while maintaining a longer back focal length, which is beneficial for module assembly. Preferably, BFL / TTL ≥ 0.3.

[0154] In this embodiment, the optical back focal length (BFL), i.e., the distance from the center of the second side of the last lens of the optical lens to the center of the second side surface of the optical lens, satisfies the following condition with respect to the lens group length (TL), i.e., the distance from the center of the first side of the first lens to the center of the second side of the last lens of the optical lens: BFL / TL ≥ 0.3. Satisfying this condition allows for miniaturization while maintaining a long back focal length, which is beneficial for module assembly. A short lens group length (TL) results in a compact structure, reduces the lens's sensitivity to MTF (Mean Transmission Factor), improves production yield, and reduces production costs. BFL / TL ≥ 0.45.

[0155] In this embodiment, the maximum field of view (FOV) of the optical lens, the total focal length (F) of the optical lens, and the image height (H) corresponding to the maximum field of view of the optical lens satisfy the condition: (FOV×F) / H≤65. Satisfying this condition ensures a short focal length for a given field of view, which is beneficial for achieving low distortion. Preferably, (FOV×F) / H≤63.

[0156] In this embodiment, the total focal length F of the optical lens and the exit pupil position EXPP relative to the second side satisfy the condition: |F / EXPP|≤0.25. Satisfying this condition means that the farther the exit pupil position is relative to the imaging plane, the smaller the telecentricity. Preferably, |F / EXPP|≤0.1.

[0157] In this embodiment, the maximum aperture D16 of the second side of the eighth lens corresponding to the maximum field of view of the optical lens, the optical back focal length (i.e., the distance BFL from the center of the second side of the last lens of the optical lens to the center of the second side of the optical lens), and the image height H corresponding to the maximum field of view of the optical lens satisfy the condition: D16*BFL / H≥45. Satisfying this condition ensures a long back focal length under the same imaging plane and image height, which is beneficial for achieving a small CRA (Cost Reduction Aspect Ratio). Preferably, D16*BFL / H≥50.

[0158] In this embodiment, the focal length F8 of the eighth lens satisfies the condition F8 / F ≥ 2.9 with the total focal length F of the optical lens. Properly allocating the focal length of the eighth lens is beneficial for achieving a small CRA (Cost Reduction Aspect Ratio). Preferably, F8 / F ≥ 3.

[0159] In this embodiment, the distance d7 from the aperture stop to the center of the cemented doublet formed by the fourth and fifth lenses satisfies the following condition with respect to the lens group length of the optical lens, i.e., the distance TL from the center of the first side of the first lens to the center of the second side of the last lens of the optical lens: d7 / TL ≥ 0.05. Satisfying this condition results in a large air gap between the aperture stop and the cemented doublet, which helps to smooth the light transition and achieve a stable light transition near the aperture stop, thus improving image quality. Preferably, d7 / TL ≥ 0.08.

[0160] In this embodiment, the combined focal length F45 of the fourth and fifth lenses satisfies |F45| / F≥1 with the overall focal length F of the optical lens. By controlling the combined focal length of the cemented doublet lenses, the trajectory of light entering the cemented doublet lenses can be effectively controlled, reducing aberrations caused by large-angle light rays entering through the first lens, while also making the lens structure compact and facilitating miniaturization. Preferably, |F45| / F≥1.5.

[0161] In this embodiment, the focal length F6 of the sixth lens and the focal length F7 of the seventh lens satisfy the condition: 0.5 ≤ F6 / F7 ≤ 1.2. Satisfying this condition ensures that the focal lengths of adjacent lenses are similar, which helps to smooth the light transition and improves image quality. Preferably, 0.7 ≤ F6 / F7 ≤ 1.

[0162] In this embodiment, the focal length F7 of the seventh lens and the focal length F8 of the eighth lens satisfy the condition: 0.3 ≤ F7 / F8 ≤ 1.5. Satisfying this condition ensures that the focal lengths of adjacent lenses are similar, which helps to smooth the light transition and improves image quality. Preferably, 0.5 ≤ F7 / F8 ≤ 1.3.

[0163] In this embodiment, the minimum center thickness dn and the maximum center thickness dm of the first to eighth lenses satisfy the condition: 0.28 ≤ dn / dm. Satisfying this condition ensures that the center thicknesses of the first to eighth lenses are similar, which helps to minimize the overall optical lens light refraction variation under high and low temperatures, resulting in excellent temperature performance. Preferably, 0.33 ≤ dn / dm.

[0164] In this embodiment, the focal length F5 of the fifth lens satisfies the condition |F5 / F|≤4 with the total focal length F of the optical lens. The fifth lens is preferably made of a special lens material, and by rationally allocating the focal length, it helps to achieve thermal compensation. Preferably, |F5 / F|≤2.5.

[0165] In this embodiment, the focal length F6 of the sixth lens satisfies the condition |F6 / F|≤7 with the total focal length F of the optical lens. The sixth lens is preferably made of a special lens material, and the reasonable allocation of focal length helps to achieve thermal compensation. Preferably, |F6 / F|≤5.4.

[0166] In this embodiment, the total focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy the condition: F / ENPD < 4. Satisfying this condition ensures a small FNO, which is beneficial for increasing the amount of light transmitted. Preferably, F / ENPD ≤ 3.

[0167] In this embodiment, the radius of curvature R8 of the second side surface of the fourth lens and the optical back focal length of the optical lens, i.e., the distance BFL from the center of the second side surface of the last lens of the optical lens to the center of the second side surface of the optical lens, satisfy the condition: |BEL / R8|≥0.6. Reasonably allocating the radius of curvature of the second side surface of the fourth lens allows light rays to diffuse as they pass through it, which is beneficial for achieving a long back focal length. Preferably, |BEL / R8|≥0.98.

[0168] In this embodiment, the radius of curvature R8 of the second side surface of the fourth lens satisfies the condition R8 / F ≥ -2.5 with the overall focal length F of the optical lens. By setting the second side surface of the fourth lens to be concave, a larger radius of curvature facilitates further divergence of light, resulting in a smoother light path and reducing system aberrations, thereby improving resolution. Preferably, R8 / F ≥ -1.

[0169] Example 2

[0170] like Figures 1 to 10As shown, the optical lens, from the first side to the second side, sequentially includes: a first lens with optical power; a second lens with negative optical power; a third lens with positive optical power; a fourth lens with negative optical power; a fifth lens with positive optical power; a sixth lens with positive optical power; a seventh lens with positive optical power; and an eighth lens with positive optical power. The total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the second side of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens, satisfy the following condition with respect to the maximum field of view (FOV): TTL / H / FOV ≤ 0.48. Satisfying this condition helps to ensure the miniaturization of the optical system, reduces the size of the optical engine, and optimizes the size layout. Preferably, TTL / H / FOV ≤ 0.3.

[0171] In this embodiment, the first lens has negative optical power, with a convex first side and a concave second side. The negative optical power diverges light, and the convex shape towards the first side helps collect more light from a large field of view into the subsequent optical system, increasing luminous flux. The significant curvature of the first side helps reduce distortion. The concave second side controls the direction of large-angle light rays at the lens edge, and the light emitted from the second side provides a larger light-receiving surface for the subsequent optical system. The convex-concave shape is symmetrical to the convex-concave shape of the sixth lens, further reducing distortion. The convex design of the first side facilitates the sliding of water droplets in practical applications, reducing their impact on imaging.

[0172] In this embodiment, the first lens has negative optical power, and both its first and second sides are concave. When the first lens has negative optical power and its first side is concave, the spherical lens with negative optical power adjusts the angle of light rays, allowing the light rays to smoothly transition to the rear and correcting system distortion. The concave first side further diverges the light rays, making the light rays transition even more smoothly, which helps to reduce system aberrations.

[0173] In this embodiment, the first lens has positive optical power, a first side surface that is convex, and a second side surface that is concave. When the first lens has positive optical power and the first side surface is convex, the convex design of the first side surface has the function of converging light. The convex design of the first side surface facilitates the collection of light over a wide area, and the entry of a large amount of light helps to improve the overall light transmission and illumination of the optical lens. At the same time, the concave second side surface provides a larger receiving surface for light, so that the light transitioning to the rear is not too sensitive, which plays a certain role in improving resolution.

[0174] In this embodiment, the first side of the second lens is convex, and the second side is concave. The negative optical power further diverges the light, and combined with the concave surface of the second side, it can collect as much light as possible from a large field of view into the rear optical system, allowing the diverged light to smoothly enter the rear and further smoothing the transition of the light path.

[0175] In this embodiment, the first side surface of the second lens is concave, and the second side surface is concave. Combined with negative optical power, this facilitates proper light diffusion, resulting in a smoother light path transition, less light deflection, reduced light energy loss, and improved illumination at the edge of the field of view. The double-concave shape further diverges the light, adjusts the light refraction angle, reduces chromatic aberration, and helps reduce system sensitivity.

[0176] In this embodiment, the first side surface of the third lens is convex, and the second side surface is also convex. When the first side surface of the third lens is convex, the positive optical power converges the light and adjusts the light so that the light path smoothly transitions to the rear. The third lens is close to the aperture stop and has a biconvex surface with similar curvature on both sides, which helps to collect more light and increase the light transmission capacity of the system.

[0177] In this embodiment, the first side of the third lens is concave, and the second side is convex. When the first side of the third lens is concave, the combination of the concave-convex shape with the preceding biconcave negative power lens is beneficial for a smooth transition of light and can effectively correct chromatic aberration.

[0178] In this embodiment, the first side surface of the fourth lens is concave, and the second side surface is also concave. When the second side surface of the fourth lens is concave, the optical power is negative, which can disperse the central and peripheral rays of each field of view, enlarge the aperture, increase the system illumination, and facilitate the correction of aberrations between the peripheral and central rays to achieve high resolution. Combined with the first side surface being concave to collect the light entering through the third lens, the design of the second side surface playing a certain role in regulating peripheral ray aberrations, thereby improving the resolution.

[0179] In this embodiment, the first side of the fourth lens is concave, and the second side is convex. The negative power lens, with its concave-convex shape, is paired with the subsequent concave-convex positive power fifth lens to correct chromatic aberration.

[0180] In this embodiment, the first side surface of the fifth lens is convex, and the second side surface is also convex. This positive power lens facilitates light convergence, and its biconvex shape allows diverging light to smoothly enter the rear, further smoothing the light path transition. Furthermore, its biconvex shape, combined with the biconcave negative power of the preceding fourth lens, is cemented together to correct chromatic aberration.

[0181] In this embodiment, the first side of the fifth lens is concave, and the second side is convex. The negative power lens, with its concave-convex shape, works in conjunction with the preceding concave-convex positive power fourth lens to correct chromatic aberration and reduce diffused light, thus helping to minimize the system aperture.

[0182] In this embodiment, the first side of the sixth lens is concave, and the second side is convex. When the first side of the sixth lens is concave, it provides positive optical power and focuses the light. At the same time, the second side being convex helps to compress the light collected at the front end, achieving a small FNO (light-to-noise ratio), while effectively reducing system CRA (cold area resistance) and improving relative illumination.

[0183] In this embodiment, the first side surface of the sixth lens is convex, and the second side surface is also convex. When the first side surface of the sixth lens is convex, the positive optical power biconvex lens is beneficial for compressing the light collected at the front end, causing the light to bend towards the optical axis, thereby reducing the angle at which the light is incident on the imaging plane, achieving a small FNO, and effectively reducing the system CRA and improving relative illumination.

[0184] In this embodiment, the first side surface of the seventh lens is convex, and the second side surface is also convex. This positive power lens optimizes the system's telecentricity and corrects system distortion, making the system an object-side telecentric system. The biconvex shape also helps to reduce the rear port diameter.

[0185] In this embodiment, the first side surface of the eighth lens is convex, and the second side surface is also convex. When the second side surface of the eighth lens is convex, it is a positive power lens, which optimizes the telecentricity of the system. The lens shape is adjusted to be biconvex, which makes the light path transition smoothly to the rear, reducing the sensitivity of the system. The convex rear surface is beneficial to the structural design and prevents edge structure interference during focusing.

[0186] In this embodiment, the first side surface of the eighth lens is convex, and the second side surface is concave. When the second side surface of the eighth lens is concave, it is a positive power lens, which optimizes the telecentricity of the system, making the system an object-side telecentric system. The convex rear surface is beneficial for structural design and prevents edge structure interference during focusing.

[0187] This application employs eight lenses. By optimizing the optical power and surface shape of each lens, the optical lens of this invention has at least one beneficial effect, such as long back focal length, small telecentricity, high resolution, good temperature performance, high light transmission, small aperture, low sensitivity, and high mass production yield.

[0188] In this embodiment, the second lens and the third lens are cemented together to form a cemented doublet; and / or the fourth lens and the fifth lens are cemented together to form a cemented doublet. That is, in this embodiment, only the second lens and the third lens may be cemented together to form a cemented doublet, or only the fourth lens and the fifth lens may be cemented together to form a cemented doublet, or both the second and third lenses may be cemented together to form a cemented doublet, and the fourth and fifth lenses may be cemented together to form a cemented doublet. The use of cemented doublets can effectively eliminate the influence of ghosting on the optical lens and correct chromatic aberration, allowing the optical lens to maintain high resolution while eliminating ghosting. The negative power fourth lens is paired with the subsequent positive power sixth lens to correct chromatic aberration. The fourth lens in a cemented doublet, with its negative optical power, has a higher refractive index (compared to the fifth lens with positive optical power), allowing light to converge effectively and smoothly at the final point, ensuring a stable arrival of light at the imaging surface and reducing overall weight and cost. It also reduces light loss caused by inter-lens reflections. The combination of high and low refractive indices facilitates a rapid transition of light from the front, increasing the aperture and light transmission, which is beneficial for high-efficiency projection. Furthermore, the use of a cemented doublet reduces the air gap between the two lenses, resulting in a more compact overall optical system structure and reducing tolerance sensitivity issues such as overall eccentricity of the lens units during assembly.

[0189] In this embodiment, the optical lens also includes an aperture stop, which is disposed between the third lens and the fourth lens. Positioning the aperture stop between the third and fourth lenses, and placing it in the middle, facilitates effective light convergence entering the optical system, reduces the lens apertures at both ends of the optical system, adjusts the telecentricity of the optical lens, and reduces the system's assembly sensitivity.

[0190] In this embodiment, the total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the second side of the optical lens, satisfies the condition TTL / F ≤ 6.1 with respect to the total focal length F of the optical lens. Controlling this condition allows the optical lens to have better performance and meets the requirements for miniaturization. Preferably, TTL / F ≤ 5.42.

[0191] In this embodiment, the total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the second side of the optical lens, satisfies the following condition with respect to the maximum aperture DMAX of the optical lens: TTL / DMAX ≤ 6. A smaller TTL / DMAX results in a more compact and smaller optical lens. Preferably, TTL / DMAX ≤ 4.7.

[0192] In this embodiment, the lens group length of the optical lens, i.e., the distance TL from the center of the first side of the first lens to the center of the second side of the last lens of the optical lens, satisfies the condition TL / D1 ≥ 1.6 with respect to the maximum aperture D1 of the first side of the first lens corresponding to the maximum field of view of the optical lens. Satisfying this condition ensures a small front aperture, enabling miniaturization. Preferably, TL / D1 ≥ 2.2.

[0193] In this embodiment, the lens group length of the optical lens, i.e., the distance TL from the center of the first side of the first lens to the center of the second side of the last lens of the optical lens, satisfies the condition TL / D15 ≥ 1.1 with respect to the maximum aperture of the first side of the eighth lens corresponding to the maximum field of view of the optical lens. Satisfying this condition ensures a small rear aperture, enabling miniaturization. Preferably, TL / D15 ≥ 1.4.

[0194] In this embodiment, the image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian value θ of the maximum field of view of the optical lens satisfy the condition: |(HF*θ) / (F*θ)|≤0.09. Controlling this condition ensures that, while keeping the field of view and image plane size constant, increasing the focal length of the optical lens enhances the imaging effect in the central region of the image plane. Preferably, |(HF*θ) / (F*θ)|≤0.076.

[0195] In this embodiment, the optical back focal length (BFL), i.e., the distance from the center of the second side of the last lens of the optical lens to the center of the second side surface of the optical lens, satisfies the condition that BFL / TTL ≥ 0.26 with respect to the total optical length of the optical lens (TTL), i.e., the distance from the center of the first side of the first lens to the center of the second side surface of the optical lens. Satisfying this condition allows for miniaturization while maintaining a longer back focal length, which is beneficial for module assembly. Preferably, BFL / TTL ≥ 0.3.

[0196] In this embodiment, the optical back focal length (BFL), i.e., the distance from the center of the second side of the last lens of the optical lens to the center of the second side surface of the optical lens, satisfies the following condition with respect to the lens group length (TL), i.e., the distance from the center of the first side of the first lens to the center of the second side of the last lens of the optical lens: BFL / TL ≥ 0.3. Satisfying this condition allows for miniaturization while maintaining a long back focal length, which is beneficial for module assembly. A short lens group length (TL) results in a compact structure, reduces the lens's sensitivity to MTF (Mean Transmission Factor), improves production yield, and reduces production costs. BFL / TL ≥ 0.45.

[0197] In this embodiment, the maximum field of view (FOV) of the optical lens, the total focal length (F) of the optical lens, and the image height (H) corresponding to the maximum field of view of the optical lens satisfy the condition: (FOV×F) / H≤65. Satisfying this condition ensures a short focal length for a given field of view, which is beneficial for achieving low distortion. Preferably, (FOV×F) / H≤63.

[0198] In this embodiment, the total focal length F of the optical lens and the exit pupil position EXPP relative to the second side satisfy the condition: |F / EXPP|≤0.25. Satisfying this condition means that the farther the exit pupil position is relative to the imaging plane, the smaller the telecentricity. Preferably, |F / EXPP|≤0.1.

[0199] In this embodiment, the maximum aperture D16 of the second side of the eighth lens corresponding to the maximum field of view of the optical lens, the optical back focal length (i.e., the distance BFL from the center of the second side of the last lens of the optical lens to the center of the second side of the optical lens), and the image height H corresponding to the maximum field of view of the optical lens satisfy the condition: D16*BFL / H≥45. Satisfying this condition ensures a long back focal length under the same imaging plane and image height, which is beneficial for achieving a small CRA (Cost Reduction Aspect Ratio). Preferably, D16*BFL / H≥50.

[0200] In this embodiment, the focal length F8 of the eighth lens satisfies the condition F8 / F ≥ 2.9 with the total focal length F of the optical lens. Properly allocating the focal length of the eighth lens is beneficial for achieving a small CRA (Cost Reduction Aspect Ratio). Preferably, F8 / F ≥ 3.

[0201] In this embodiment, the distance d7 from the aperture stop to the center of the cemented doublet formed by the fourth and fifth lenses satisfies the following condition with respect to the lens group length of the optical lens, i.e., the distance TL from the center of the first side of the first lens to the center of the second side of the last lens of the optical lens: d7 / TL ≥ 0.05. Satisfying this condition results in a large air gap between the aperture stop and the cemented doublet, which helps to smooth the light transition and achieve a stable light transition near the aperture stop, thus improving image quality. Preferably, d7 / TL ≥ 0.08.

[0202] In this embodiment, the combined focal length F45 of the fourth and fifth lenses satisfies |F45| / F≥1 with the overall focal length F of the optical lens. By controlling the combined focal length of the cemented doublet lenses, the trajectory of light entering the cemented doublet lenses can be effectively controlled, reducing aberrations caused by large-angle light rays entering through the first lens, while also making the lens structure compact and facilitating miniaturization. Preferably, |F45| / F≥1.5.

[0203] In this embodiment, the focal length F6 of the sixth lens and the focal length F7 of the seventh lens satisfy the condition: 0.5 ≤ F6 / F7 ≤ 1.2. Satisfying this condition ensures that the focal lengths of adjacent lenses are similar, which helps to smooth the light transition and improves image quality. Preferably, 0.7 ≤ F6 / F7 ≤ 1.

[0204] In this embodiment, the focal length F7 of the seventh lens and the focal length F8 of the eighth lens satisfy the condition: 0.3 ≤ F7 / F8 ≤ 1.5. Satisfying this condition ensures that the focal lengths of adjacent lenses are similar, which helps to smooth the light transition and improves image quality. Preferably, 0.5 ≤ F7 / F8 ≤ 1.3.

[0205] In this embodiment, the minimum center thickness dn and the maximum center thickness dm of the first to eighth lenses satisfy the condition: 0.28 ≤ dn / dm. Satisfying this condition ensures that the center thicknesses of the first to eighth lenses are similar, which helps to minimize the overall optical lens light refraction variation under high and low temperatures, resulting in excellent temperature performance. Preferably, 0.33 ≤ dn / dm.

[0206] In this embodiment, the focal length F5 of the fifth lens satisfies the condition |F5 / F|≤4 with the total focal length F of the optical lens. The fifth lens is preferably made of a special lens material, and by rationally allocating the focal length, it helps to achieve thermal compensation. Preferably, |F5 / F|≤2.5.

[0207] In this embodiment, the focal length F6 of the sixth lens satisfies the condition |F6 / F|≤7 with the total focal length F of the optical lens. The sixth lens is preferably made of a special lens material, and the reasonable allocation of focal length helps to achieve thermal compensation. Preferably, |F6 / F|≤5.4.

[0208] In this embodiment, the total focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy the condition: F / ENPD < 4. Satisfying this condition ensures a small FNO, which is beneficial for increasing the amount of light transmitted. Preferably, F / ENPD ≤ 3.

[0209] In this embodiment, the radius of curvature R8 of the second side surface of the fourth lens and the optical back focal length of the optical lens, i.e., the distance BFL from the center of the second side surface of the last lens of the optical lens to the center of the second side surface of the optical lens, satisfy the condition: |BEL / R8|≥0.6. Reasonably allocating the radius of curvature of the second side surface of the fourth lens allows light rays to diffuse as they pass through it, which is beneficial for achieving a long back focal length. Preferably, |BEL / R8|≥0.98.

[0210] In this embodiment, the radius of curvature R8 of the second side surface of the fourth lens satisfies the condition R8 / F ≥ -2.5 with respect to the overall focal length F of the optical lens. By setting the second side surface of the fourth lens to be convex, a larger radius of curvature facilitates further light divergence and a smoother light path, which is more conducive to reducing system aberrations and thus improving resolution. Preferably, R8 / F ≥ -1.

[0211] Optionally, the aforementioned optical lens may also include a color filter for correcting color deviation and a protective glass for protecting the photosensitive element located on the imaging surface.

[0212] The optical lens in this application may employ multiple lenses, such as the eight lenses mentioned above. This application does not specifically limit the number of spherical and aspherical lenses; the number of aspherical lenses can be increased when image quality is a primary concern. Aspherical lenses are characterized by a continuously changing curvature from the lens center to the periphery. Unlike spherical lenses, which have a constant curvature from the lens center to the periphery, aspherical lenses have superior curvature radius characteristics, offering advantages in improving distortion and astigmatism. Using aspherical lenses can minimize aberrations that occur during imaging, thereby improving image quality.

[0213] In this exemplary embodiment, the solution is not limited to using plastic or glass for the lenses. If temperature performance is a primary concern, the first, second, third, fourth, fifth, sixth, seventh, and eighth lenses can all be glass lenses. Optical lenses made of glass can suppress the shift in the back focus of the optical lens due to temperature changes, thereby improving system stability. Simultaneously, using glass avoids lens blurring caused by high and low temperature variations in the operating environment, thus preventing disruption to the normal use of the optical lens. For example, an all-glass optical lens has a wider temperature range, maintaining stable optical performance within the range of -40℃ to 105℃. Specifically, when resolution and reliability are of primary concern, the first to eighth lenses can all be aspherical glass lenses. Of course, in applications with lower temperature stability requirements, the first to eighth lenses in the optical lens can also be made of plastic. Using plastic to make optical lenses can effectively reduce manufacturing costs. Alternatively, the first to eighth lenses in the optical lens can also be made of a combination of plastic and glass.

[0214] This application also provides an electronic device, including the aforementioned optical lens and an imaging element that converts the optical image formed by the optical lens into an electrical signal. The imaging element may be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The electronic device may be a standalone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. This electronic device is equipped with the optical lens described above.

[0215] However, those skilled in the art will understand that the number of lenses constituting the optical lens can be varied to obtain the various results and advantages described herein without departing from the technical solutions claimed in this application. For example, although an embodiment is described using eight lenses as an example, the optical lens is not limited to including eight lenses. The optical lens may include other numbers of lenses if desired.

[0216] The following description, with reference to the accompanying drawings, further illustrates examples of specific surface shapes and parameters of optical lenses applicable to the above embodiments.

[0217] It should be noted that any of the examples one through ten below are applicable to all embodiments of this application.

[0218] Example 1

[0219] like Figure 1 The diagram shown is a schematic of the optical lens structure of Example 1.

[0220] like Figure 1 As shown, the optical lens, from the first side to the second side, includes: a first lens L1, a second lens L2, a third lens L3, an aperture stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a first side surface of a polarizer S17, a second side surface of a polarizer S18, a first side surface of a compensator S19, a second side surface of a compensator S20, a first side surface of a protective glass S21, a second side surface of a protective glass S22, and an image source surface IMA.

[0221] The first lens L1 has negative optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is convex, and its second side surface S4 is concave. The third lens L3 has positive optical power, its first side surface S5 is convex, and its second side surface S6 is convex. The fourth lens L4 has negative optical power, its first side surface S8 is concave, and its second side surface S9 is concave. The fifth lens L5 has positive optical power, its first side surface S9 is convex, and its second side surface S10 is convex. The sixth lens L6 has positive optical power, its first side surface S11 is concave, and its second side surface S12 is convex. The seventh lens L7 has positive optical power, its first side surface S13 is convex, and its second side surface S14 is convex. The eighth lens L8 has positive optical power. The first side surface S15 of the eighth lens is convex, and the second side surface S16 of the eighth lens is also convex. Since the fourth lens L4 and the fifth lens L5 are cemented together to form a cemented doublet lens, the second side surface S9 of the fourth lens and the first side surface S9 of the fifth lens are the same surface.

[0222] In this example, the total effective focal length F of the optical lens is 14.464mm, the maximum field of view (FOV) of the optical lens is 38.846°, and the total length (TTL) of the optical lens is 75.497mm.

[0223] Table 1 shows the basic structural parameters of the optical lens in Example 1, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0224]

[0225]

[0226] Table 1

[0227] Example 2

[0228] like Figure 2 The diagram shown is a schematic of the optical lens structure in Example 2.

[0229] like Figure 2 As shown, the optical lens, from the first side to the second side, includes: a first lens L1, a second lens L2, a third lens L3, an aperture stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a first side surface of a polarizer S17, a second side surface of a polarizer S18, a first side surface of a compensator S19, a second side surface of a compensator S20, a first side surface of a protective glass S21, a second side surface of a protective glass S22, and an image source surface IMA.

[0230] The first lens L1 has negative optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is convex, and its second side surface S4 is concave. The third lens L3 has positive optical power, its first side surface S5 is convex, and its second side surface S6 is convex. The fourth lens L4 has negative optical power, its first side surface S8 is concave, and its second side surface S9 is concave. The fifth lens L5 has positive optical power, its first side surface S9 is convex, and its second side surface S10 is convex. The sixth lens L6 has positive optical power, its first side surface S11 is concave, and its second side surface S12 is convex. The seventh lens L7 has positive optical power, its first side surface S13 is convex, and its second side surface S14 is convex. The eighth lens L8 has positive optical power. The first side surface S15 of the eighth lens is convex, and the second side surface S16 of the eighth lens is also convex. Since the fourth lens L4 and the fifth lens L5 are cemented together to form a cemented doublet lens, the second side surface S9 of the fourth lens and the first side surface S9 of the fifth lens are the same surface.

[0231] In this example, the total effective focal length F of the optical lens is 14.464mm, the maximum field of view (FOV) of the optical lens is 38.799°, and the total length (TTL) of the optical lens is 74.502mm.

[0232] Table 2 shows the basic structural parameters of the optical lens in Example 2, where the units for radius of curvature (Radius) and thickness / distance are millimeters (mm).

[0233]

[0234]

[0235] Table 2

[0236] Example 3

[0237] like Figure 3 The diagram shown is a schematic of the optical lens structure in Example 3.

[0238] like Figure 3 As shown, the optical lens, from the first side to the second side, includes: a first lens L1, a second lens L2, a third lens L3, an aperture stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a first side surface of a polarizer S17, a second side surface of a polarizer S18, a first side surface of a compensator S19, a second side surface of a compensator S20, a first side surface of a protective glass S21, a second side surface of a protective glass S22, and an image source surface IMA.

[0239] The first lens L1 has negative optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is convex, and its second side surface S4 is concave. The third lens L3 has positive optical power, its first side surface S5 is convex, and its second side surface S6 is convex. The fourth lens L4 has negative optical power, its first side surface S8 is concave, and its second side surface S9 is concave. The fifth lens L5 has positive optical power, its first side surface S9 is convex, and its second side surface S10 is convex. The sixth lens L6 has positive optical power, its first side surface S11 is concave, and its second side surface S12 is convex. The seventh lens L7 has positive optical power, its first side surface S13 is convex, and its second side surface S14 is convex. The eighth lens L8 has positive optical power. The first side surface S15 of the eighth lens is convex, and the second side surface S16 of the eighth lens is concave. Since the fourth lens L4 and the fifth lens L5 are cemented together to form a cemented doublet lens, the second side surface S9 of the fourth lens and the first side surface S9 of the fifth lens are the same surface.

[0240] In this example, the total effective focal length F of the optical lens is 14.341mm, the maximum field of view (FOV) of the optical lens is 39.016°, and the total length (TTL) of the optical lens is 76.6mm.

[0241] Table 3 shows the basic structural parameters of the optical lens in Example 3, where the units for radius of curvature (Radius) and thickness / distance are millimeters (mm).

[0242]

[0243]

[0244] Table 3

[0245] Example 4

[0246] like Figure 4 The diagram shown is a schematic of the optical lens structure of Example 4.

[0247] like Figure 4 As shown, the optical lens, from the first side to the second side, includes: a first lens L1, a second lens L2, a third lens L3, an aperture stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a first side surface of a polarizer S17, a second side surface of a polarizer S18, a first side surface of a compensator S19, a second side surface of a compensator S20, a first side surface of a protective glass S21, a second side surface of a protective glass S22, and an image source surface IMA.

[0248] The first lens L1 has negative optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is convex, and its second side surface S4 is concave. The third lens L3 has positive optical power, its first side surface S5 is convex, and its second side surface S6 is convex. The fourth lens L4 has negative optical power, its first side surface S8 is concave, and its second side surface S9 is concave. The fifth lens L5 has positive optical power, its first side surface S9 is convex, and its second side surface S10 is convex. The sixth lens L6 has positive optical power, its first side surface S11 is concave, and its second side surface S12 is convex. The seventh lens L7 has positive optical power, its first side surface S13 is convex, and its second side surface S14 is convex. The eighth lens L8 has positive optical power. The first side surface S15 of the eighth lens is convex, and the second side surface S16 of the eighth lens is concave. Since the fourth lens L4 and the fifth lens L5 are cemented together to form a cemented doublet lens, the second side surface S9 of the fourth lens and the first side surface S9 of the fifth lens are the same surface.

[0249] In this example, the total effective focal length F of the optical lens is 14.376mm, the maximum field of view (FOV) of the optical lens is 39.000°, and the total length (TTL) of the optical lens is 76.751mm.

[0250] Table 4 shows the basic structural parameters of the optical lens in Example 4, where the units for radius of curvature (Radius) and thickness / distance are millimeters (mm).

[0251] Surf Radius Thickness Nd Vd 1 21.217 3.200 1.78 25.72 2 11.286 3.991 3 295.155 3.000 1.67 47.20 4 17.311 6.916 5 21.686 3.559 1.76 27.53 6 -34.459 2.545 STO Infinity 7.708 8 -11.977 4.500 1.85 23.79 9 48.795 4.500 1.50 81.59 10 -14.998 0.266 11 -92.483 3.500 1.50 81.59 12 -21.906 0.106 13 91.974 3.000 1.66 50.85 14 -67.501 0.110 15 28.415 3.000 1.77 49.61 16 66.223 2.100 17 Infinity 0.725 1.52 54.09 18 Infinity 21.230 19 Infinity 0.495 1.52 54.09 20 Infinity 1.600 21 Infinity 0.700 1.52 62.00 22 Infinity -0.206 IMA / /

[0252] Table 4

[0253] Example 5

[0254] like Figure 5 The diagram shown is a schematic of the optical lens structure of Example 5.

[0255] like Figure 5 As shown, the optical lens, from the first side to the second side, includes: a first lens L1, a second lens L2, a third lens L3, an aperture stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a first side surface of a polarizer S16, a second side surface of a polarizer S17, a first side surface of a compensator S18, a second side surface of a compensator S19, a first side surface of a protective glass S20, a second side surface of a protective glass S21, and an image source surface IMA.

[0256] The first lens L1 has negative optical power, with its first side surface S1 being concave and its second side surface S2 being concave. The second lens L2 has negative optical power, with its first side surface S3 being convex and its second side surface S4 being concave. The third lens L3 has positive optical power, with its first side surface S4 being convex and its second side surface S5 being convex. The fourth lens L4 has negative optical power, with its first side surface S7 being concave and its second side surface S8 being concave. The fifth lens L5 has positive optical power, with its first side surface S8 being convex and its second side surface S9 being convex. The sixth lens L6 has positive optical power, with its first side surface S10 being convex and its second side surface S11 being convex. The seventh lens L7 has positive optical power, with its first side surface S12 being convex and its second side surface S13 being convex. The eighth lens L8 has positive optical power. Its first side surface S14 is convex, and its second side surface S15 is concave. Since the second lens L2 and the third lens L3 are cemented together to form a cemented doublet, the second side surface S4 of the second lens and the first side surface S4 of the third lens are the same surface. Similarly, since the fourth lens L4 and the fifth lens L5 are cemented together to form a cemented doublet, the second side surface S8 of the fourth lens and the first side surface S8 of the fifth lens are the same surface.

[0257] In this example, the total effective focal length F of the optical lens is 14.386mm, the maximum field of view (FOV) of the optical lens is 39.981°, and the total length (TTL) of the optical lens is 75.964mm.

[0258] Table 5 shows the basic structural parameters of the optical lens in Example 5, where the units for radius of curvature (Radius) and thickness / distance are millimeters (mm).

[0259] Surf Radius Thickness Nd Vd 1 -60.283 3.200 1.78 25.72 2 13.735 6.183 3 30.191 3.200 1.67 47.20 4 14.355 3.559 1.76 27.53 5 -27.242 5.606 STO Infinity 6.690 7 -12.500 4.500 1.85 23.79 8 64.497 4.500 1.50 81.59 9 -14.166 1.208 10 73.583 3.500 1.50 81.59 11 -38.768 0.110 12 80.102 3.200 1.66 50.85 13 -76.242 0.110 14 38.201 3.200 1.77 49.61 15 89.883 2.446 16 Infinity 0.725 1.52 54.09 17 Infinity 21.230 18 Infinity 0.495 1.52 54.09 19 Infinity 1.600 20 Infinity 0.700 1.52 62.00 21 Infinity -0.206 IMA / /

[0260] Table 5

[0261] Example 6

[0262] like Figure 6 The diagram shown is a schematic of the optical lens structure of Example 6.

[0263] like Figure 6As shown, the optical lens, from the first side to the second side, includes: a first lens L1, a second lens L2, a third lens L3, an aperture stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a first side surface of a polarizer S16, a second side surface of a polarizer S17, a first side surface of a compensator S18, a second side surface of a compensator S19, a first side surface of a protective glass S20, a second side surface of a protective glass S21, and an image source surface IMA.

[0264] The first lens L1 has negative optical power, with its first side surface S1 being concave and its second side surface S2 being concave. The second lens L2 has negative optical power, with its first side surface S3 being convex and its second side surface S4 being concave. The third lens L3 has positive optical power, with its first side surface S4 being convex and its second side surface S5 being convex. The fourth lens L4 has negative optical power, with its first side surface S7 being concave and its second side surface S8 being concave. The fifth lens L5 has positive optical power, with its first side surface S8 being convex and its second side surface S9 being convex. The sixth lens L6 has positive optical power, with its first side surface S10 being convex and its second side surface S11 being convex. The seventh lens L7 has positive optical power, with its first side surface S12 being convex and its second side surface S13 being convex. The eighth lens L8 has positive optical power. Its first side surface S14 is convex, and its second side surface S15 is concave. Since the second lens L2 and the third lens L3 are cemented together to form a cemented doublet, the second side surface S4 of the second lens and the first side surface S4 of the third lens are the same surface. Similarly, since the fourth lens L4 and the fifth lens L5 are cemented together to form a cemented doublet, the second side surface S8 of the fourth lens and the first side surface S8 of the fifth lens are the same surface.

[0265] In this example, the total effective focal length F of the optical lens is 14.363mm, the maximum field of view (FOV) of the optical lens is 40.003°, and the total length (TTL) of the optical lens is 76.025mm.

[0266] Table 6 shows the basic structural parameters of the optical lens in Example 6, where the units for radius of curvature (Radius) and thickness / distance are millimeters (mm).

[0267] Surf Radius Thickness Nd Vd 1 -62.947 3.200 1.78 25.72 2 13.422 6.295 3 31.021 3.200 1.67 47.20 4 13.934 3.559 1.76 27.53 5 -27.242 5.465 STO Infinity 6.460 7 -13.146 4.500 1.85 23.79 8 54.198 4.500 1.50 81.59 9 -14.632 1.185 10 70.751 3.500 1.50 81.59 11 -41.006 0.105 12 87.810 3.200 1.66 50.85 13 -66.383 0.110 14 38.560 3.200 1.77 49.61 15 89.767 2.796 16 Infinity 0.725 1.52 54.09 17 Infinity 21.230 18 Infinity 0.495 1.52 54.09 19 Infinity 1.600 20 Infinity 0.700 1.52 62.00 21 Infinity -0.206 IMA / /

[0268] Table 6

[0269] Example 7

[0270] like Figure 7 The diagram shown is a schematic of the optical lens structure of Example 7.

[0271] like Figure 7 As shown, the optical lens, from the first side to the second side, includes: a first lens L1, a second lens L2, a third lens L3, an aperture stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a first side surface of a polarizer S17, a second side surface of a polarizer S18, a first side surface of a compensator S19, a second side surface of a compensator S20, a first side surface of a protective glass S21, a second side surface of a protective glass S22, and an image source surface IMA.

[0272] The first lens L1 has negative optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is concave, and its second side surface S4 is concave. The third lens L3 has positive optical power, its first side surface S5 is convex, and its second side surface S6 is convex. The fourth lens L4 has negative optical power, its first side surface S8 is concave, and its second side surface S9 is concave. The fifth lens L5 has positive optical power, its first side surface S9 is convex, and its second side surface S10 is convex. The sixth lens L6 has positive optical power, its first side surface S11 is convex, and its second side surface S12 is convex. The seventh lens L7 has positive optical power, its first side surface S13 is convex, and its second side surface S14 is convex. The eighth lens L8 has positive optical power. The first side surface S15 of the eighth lens is convex, and the second side surface S16 of the eighth lens is concave. Since the fourth lens L4 and the fifth lens L5 are cemented together to form a cemented doublet lens, the second side surface S9 of the fourth lens and the first side surface S9 of the fifth lens are the same surface.

[0273] In this example, the total effective focal length F of the optical lens is 14.309mm, the maximum field of view (FOV) of the optical lens is 39.902°, and the total length (TTL) of the optical lens is 76.751mm.

[0274] Table 7 shows the basic structural parameters of the optical lens in Example 7, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0275] Surf Radius Thickness Nd Vd 1 55.657 3.602 1.78 25.72 2 19.104 2.144 3 -95.511 2.600 1.67 47.20 4 13.543 4.006 5 31.251 3.400 1.76 27.53 6 -23.257 2.001 STO Infinity 12.519 8 -22.202 4.601 1.85 23.79 9 45.873 4.436 1.50 81.59 10 -18.253 0.160 11 112.996 3.558 1.50 81.59 12 -35.992 0.110 13 443.850 2.999 1.66 50.85 14 -41.360 0.110 15 37.890 2.710 1.77 49.61 16 81.776 3.043 17 Infinity 0.725 1.52 54.09 18 Infinity 21.230 19 Infinity 0.495 1.52 54.09 20 Infinity 1.600 21 Infinity 0.700 1.52 62.00 IMA / / IMA / /

[0276] Table 7

[0277] Example 8

[0278] like Figure 8 The diagram shown is a schematic of the optical lens structure of Example 8.

[0279] like Figure 8As shown, the optical lens, from the first side to the second side, includes: a first lens L1, a second lens L2, a third lens L3, an aperture stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a first side surface of a polarizer S17, a second side surface of a polarizer S18, a first side surface of a compensator S19, a second side surface of a compensator S20, a first side surface of a protective glass S21, a second side surface of a protective glass S22, and an image source surface IMA.

[0280] The first lens L1 has negative optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is concave, and its second side surface S4 is concave. The third lens L3 has positive optical power, its first side surface S5 is convex, and its second side surface S6 is convex. The fourth lens L4 has negative optical power, its first side surface S8 is concave, and its second side surface S9 is concave. The fifth lens L5 has positive optical power, its first side surface S9 is convex, and its second side surface S10 is convex. The sixth lens L6 has positive optical power, its first side surface S11 is convex, and its second side surface S12 is convex. The seventh lens L7 has positive optical power, its first side surface S13 is convex, and its second side surface S14 is convex. The eighth lens L8 has positive optical power. The first side surface S15 of the eighth lens is convex, and the second side surface S16 of the eighth lens is concave. Since the fourth lens L4 and the fifth lens L5 are cemented together to form a cemented doublet lens, the second side surface S9 of the fourth lens and the first side surface S9 of the fifth lens are the same surface.

[0281] In this example, the total effective focal length F of the optical lens is 14.309mm, the maximum field of view (FOV) of the optical lens is 39.908°, and the total length (TTL) of the optical lens is 76.750mm.

[0282] Table 8 shows the basic structural parameters of the optical lens of Example 8, where the units for radius of curvature (Radius) and thickness (Thickness / Distance) are millimeters (mm).

[0283]

[0284]

[0285] Table 8

[0286] Example 9

[0287] like Figure 9 The diagram shown is a schematic of the optical lens structure of Example 9.

[0288] like Figure 9 As shown, the optical lens, from the first side to the second side, includes: a first lens L1, a second lens L2, a third lens L3, an aperture stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a first side surface of a polarizer S17, a second side surface of a polarizer S18, a first side surface of a compensator S19, a second side surface of a compensator S20, a first side surface of a protective glass S21, a second side surface of a protective glass S22, and an image source surface IMA.

[0289] The first lens L1 has positive optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is concave, and its second side surface S4 is concave. The third lens L3 has positive optical power, its first side surface S5 is concave, and its second side surface S6 is convex. The fourth lens L4 has negative optical power, its first side surface S8 is concave, and its second side surface S9 is convex. The fifth lens L5 has positive optical power, its first side surface S9 is concave, and its second side surface S10 is convex. The sixth lens L6 has positive optical power, its first side surface S11 is convex, and its second side surface S12 is convex. The seventh lens L7 has positive optical power, its first side surface S13 is convex, and its second side surface S14 is convex. The eighth lens L8 has positive optical power. The first side surface S15 of the eighth lens is convex, and the second side surface S16 of the eighth lens is concave. Since the fourth lens L4 and the fifth lens L5 are cemented together to form a cemented doublet lens, the second side surface S9 of the fourth lens and the first side surface S9 of the fifth lens are the same surface.

[0290] In this example, the total effective focal length F of the optical lens is 15.916mm, the maximum field of view (FOV) of the optical lens is 38.032°, and the total length (TTL) of the optical lens is 76.750mm.

[0291] Table 9 shows the basic structural parameters of the optical lens of Example 9, where the units for radius of curvature (Radius) and thickness (Thickness / Distance) are millimeters (mm).

[0292]

[0293]

[0294] Table 9

[0295] Example 10

[0296] like Figure 10 The diagram shown is a schematic of the optical lens structure of Example 10.

[0297] like Figure 10 As shown, the optical lens, from the first side to the second side, includes: a first lens L1, a second lens L2, a third lens L3, an aperture stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a first side surface of a polarizer S17, a second side surface of a polarizer S18, a first side surface of a compensator S19, a second side surface of a compensator S20, a first side surface of a protective glass S21, a second side surface of a protective glass S22, and an image source surface IMA.

[0298] The first lens L1 has positive optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is concave, and its second side surface S4 is concave. The third lens L3 has positive optical power, its first side surface S5 is concave, and its second side surface S6 is convex. The fourth lens L4 has negative optical power, its first side surface S8 is concave, and its second side surface S9 is convex. The fifth lens L5 has positive optical power, its first side surface S9 is concave, and its second side surface S10 is convex. The sixth lens L6 has positive optical power, its first side surface S11 is convex, and its second side surface S12 is convex. The seventh lens L7 has positive optical power, its first side surface S13 is convex, and its second side surface S14 is convex. The eighth lens L8 has positive optical power. The first side surface S15 of the eighth lens is convex, and the second side surface S16 of the eighth lens is concave. Since the fourth lens L4 and the fifth lens L5 are cemented together to form a cemented doublet lens, the second side surface S9 of the fourth lens and the first side surface S9 of the fifth lens are the same surface.

[0299] In this example, the total effective focal length F of the optical lens is 15.917mm, the maximum field of view (FOV) of the optical lens is 38.028°, and the total length (TTL) of the optical lens is 76.751mm.

[0300] Table 10 shows the basic structural parameters of the optical lens of Example 10, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0301]

[0302]

[0303] Table 10

[0304] In summary, Examples 1 through 15 satisfy the relationships shown in Table 11.

[0305]

[0306]

[0307] Table 11

[0308] Table 12 gives the effective focal length F of the optical lenses in Examples 1 to 10, and the effective focal lengths of each lens from F1 to F8, etc. (unit: mm).

[0309] Parameters / Examples 1 2 3 4 5 6 7 8 9 10 F 14.464 14.464 14.341 14.376 14.386 14.363 14.309 14.309 15.916 15.917 FNO 1.988 1.987 1.989 1.991 1.986 1.983 2.010 2.010 1.982 1.982 ENPD 7.275 7.281 7.210 7.219 7.246 7.243 7.118 7.118 8.031 8.031 TTL 75.497 74.502 76.600 76.751 75.964 76.025 76.751 76.750 76.750 76.751 FOV 38.846 38.799 39.016 39.000 39.981 40.003 39.902 39.908 38.032 38.028 θ 0.678 0.677 0.681 0.681 0.698 0.698 0.696 0.697 0.664 0.664 H 9.912 9.912 9.912 9.912 9.912 9.912 9.912 9.912 9.912 9.912 D 16.328 16.416 15.833 15.846 14.018 13.945 13.994 13.989 17.204 17.214 TL 48.347 47.562 49.724 49.900 48.767 48.479 48.957 48.962 49.900 49.901 BFL 27.150 26.941 26.876 26.851 27.197 27.546 27.793 27.788 26.850 26.850 L 51.933 50.819 53.174 53.334 54.009 54.100 58.998 59.006 53.405 53.358 DST 10.232 10.143 11.708 11.516 11.223 11.404 11.175 11.179 9.795 9.799 DMAX 22.552 22.279 21.816 22.113 23.065 22.974 24.496 24.497 24.242 24.226 F1 -39.073 -40.783 -34.455 -35.276 -13.763 -13.619 -38.143 -38.126 37.748 37.738 F2 -25.621 -25.546 -27.156 -27.324 -44.075 -40.482 -17.379 -17.379 -16.301 -16.298 F3 18.298 18.309 17.571 17.851 12.735 12.493 17.875 17.868 62.148 61.700 F4 -10.398 -10.398 -10.717 -10.792 -11.833 -11.911 -16.838 -16.836 -16.099 -16.195 F5 25.178 25.133 22.968 23.518 23.703 23.578 26.755 26.756 31.625 31.889 F6 50.028 50.117 58.154 56.529 51.361 52.516 55.082 55.186 51.173 50.946 F7 60.178 60.096 60.478 59.086 59.326 57.422 57.134 57.029 55.019 54.977 F8 45.950 45.888 61.892 61.744 83.032 84.461 88.246 88.263 74.459 75.134 EXPP -234.326 -205.972 -248.837 -314.110 -192.935 -164.111 267.945 268.301 -178.940 -180.963 d7 5.550 5.434 7.603 7.708 6.690 6.460 12.519 12.518 6.251 6.302 dn 1.818 1.937 3.000 3.000 3.200 3.200 2.600 2.600 2.510 2.516 dm 4.585 4.597 3.559 3.559 4.500 4.500 4.601 4.601 4.885 4.911 D1 16.328 16.416 15.833 15.846 14.018 13.945 13.994 13.989 17.204 17.214 D15 22.552 22.279 21.604 21.879 22.602 22.492 23.661 23.660 23.681 23.653 D16 22.322 22.048 20.943 21.219 21.814 21.706 23.002 23.001 22.478 22.473 F45 -24.721 -24.798 -30.470 -29.862 -37.951 -38.136 -73.416 -73.375 -52.229 -52.275 R8 -11.440 -11.444 -12.090 -11.977 -12.500 -13.146 -22.202 -22.200 -12.168 -12.164

[0310] Table 12

[0311] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0312] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0313] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0314] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An optical lens, characterized in that, The optical lens consists of eight lenses, which are sequentially arranged from the first side to the second side as follows: A first lens having optical power, wherein the second side surface of the first lens is concave. A second lens with negative optical power, wherein the second side surface of the second lens is concave. A third lens having positive optical power, wherein the second side surface of the third lens is convex; A fourth lens with negative optical power, wherein the first side surface of the fourth lens is concave; A fifth lens with positive optical power, wherein the second side surface of the fifth lens is convex; A sixth lens having positive optical power, wherein the second side surface of the sixth lens is convex; A seventh lens with positive optical power, wherein the first side surface of the seventh lens is convex and the second side surface is convex; An eighth lens with positive optical power, wherein the first side surface of the eighth lens is convex; the fourth lens and the fifth lens are cemented together to form a cemented doublet lens; the focal length F8 of the eighth lens and the total focal length F of the optical lens satisfy the following condition: 6.168≥F8 / F≥2.

9.

2. The optical lens according to claim 1, characterized in that, The first lens has negative optical power, and the first side surface of the first lens is convex.

3. The optical lens according to claim 1, characterized in that, The first lens has negative optical power, and the first side surface of the first lens is concave.

4. The optical lens according to claim 1, characterized in that, The first lens has positive optical power, and the first side surface of the first lens is convex.

5. The optical lens according to claim 1, characterized in that, The first side surface of the second lens is convex.

6. The optical lens according to claim 1, characterized in that, The first side surface of the second lens is concave.

7. The optical lens according to claim 1, characterized in that, The first side surface of the third lens is convex.

8. The optical lens according to claim 1, characterized in that, The first side surface of the third lens is concave.

9. The optical lens according to claim 1, characterized in that, The second side surface of the fourth lens is concave.

10. The optical lens according to claim 1, characterized in that, The second side surface of the fourth lens is convex.

11. The optical lens according to claim 1, characterized in that, The first side surface of the fifth lens is convex.

12. The optical lens according to claim 1, characterized in that, The first side surface of the fifth lens is concave.

13. The optical lens according to claim 1, characterized in that, The first side surface of the sixth lens is concave.

14. The optical lens according to claim 1, characterized in that, The first side surface of the sixth lens is convex.

15. The optical lens according to claim 1, characterized in that, The second side surface of the eighth lens is convex.

16. The optical lens according to claim 1, characterized in that, The second side surface of the eighth lens is concave.

17. The optical lens according to claim 1, characterized in that, The second lens and the third lens are cemented together to form a cemented doublet lens.

18. The optical lens according to claim 1, characterized in that, The optical lens also includes an aperture stop, which is disposed between the third lens and the fourth lens.

19. The optical lens according to any one of claims 1 to 18, characterized in that, The total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the second side of the optical lens, satisfies the following condition with respect to the total focal length F of the optical lens: 4.822≤TTL / F≤6.

1.

20. The optical lens according to any one of claims 1 to 18, characterized in that, The total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the second side of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy the following: 0.192(1 / °)≤TTL / H / FOV≤0.48(1 / °).

21. The optical lens according to any one of claims 1 to 18, characterized in that, The total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the second side of the optical lens, satisfies the following condition with respect to the maximum aperture DMAX of the optical lens: 3.133≤TTL / DMAX≤6.

22. The optical lens according to any one of claims 1 to 18, characterized in that, The lens group length of the optical lens, i.e., the distance TL from the center of the first side of the first lens to the center of the second side of the last lens of the optical lens, satisfies the following condition with respect to the maximum aperture D1 of the first side of the first lens corresponding to the maximum field of view of the optical lens: 3.500≥TL / D1≥1.

6.

23. The optical lens according to any one of claims 1 to 18, characterized in that, The lens group length of the optical lens, i.e., the distance TL from the center of the first side of the first lens to the center of the second side of the last lens of the optical lens, satisfies the following condition with respect to the maximum aperture D15 of the first side of the eighth lens corresponding to the maximum field of view of the optical lens: 2.302≥TL / D15≥1.

1.

24. The optical lens according to any one of claims 1 to 18, characterized in that, The image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian value θ of the maximum field of view of the optical lens satisfy the following relationship: 0.005 ≤ |HF θ) / (F θ)|≤0.

09.

25. The optical lens according to any one of claims 1 to 18, characterized in that, The optical back focal length of the optical lens, i.e., the distance BFL from the center of the second side of the last lens of the optical lens to the center of the second side of the optical lens, and the optical total length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the second side of the optical lens, satisfy the following condition: 0.362≥BFL / TTL≥0.

26.

26. The optical lens according to any one of claims 1 to 18, characterized in that, The optical back focal length of the optical lens, i.e., the distance BFL from the center of the second side of the last lens of the optical lens to the center of the second side of the optical lens, satisfies the following condition with respect to the lens group length of the optical lens, i.e., the distance TL from the center of the first side of the first lens to the center of the second side of the last lens of the optical lens: 0.568 ≥ BFL / TL ≥ 0.

3.

27. The optical lens according to any one of claims 1 to 18, characterized in that, The maximum field of view (FOV) of the optical lens, the total focal length (F) of the optical lens, and the image height (H) corresponding to the maximum field of view of the optical lens satisfy the following relationship: (FOV) F) / H≤65°.

28. The optical lens according to any one of claims 1 to 18, characterized in that, The total focal length F of the optical lens and the exit pupil position EXPP of the optical lens relative to the second side satisfy the following condition: |F / EXPP|≤0.

25.

29. The optical lens according to any one of claims 1 to 18, characterized in that, The maximum aperture D16 of the second side of the eighth lens corresponding to the maximum field of view of the optical lens, the optical back focal length of the optical lens (i.e., the distance BFL from the center of the second side of the last lens of the optical lens to the center of the second side of the optical lens), and the image height H corresponding to the maximum field of view of the optical lens satisfy the following relationship: 64.497 ≥ D16 BFL / H≥45.

30. The optical lens according to any one of claims 1 to 18, characterized in that, The distance d7 from the aperture stop to the center of the cemented doublet formed by the fourth lens and the fifth lens satisfies the following condition with respect to the lens group length of the optical lens, i.e., the distance TL from the center of the first side of the first lens to the center of the second side of the last lens of the optical lens: 0.875≥d7 / TL≥0.

05.

31. The optical lens according to any one of claims 1 to 18, characterized in that, The combined focal length F45 of the fourth lens and the fifth lens satisfies the following relationship with the total focal length F of the optical lens: 5.131≥|F45| / F≥1.

32. The optical lens according to any one of claims 1 to 18, characterized in that, The focal length F6 of the sixth lens and the focal length F7 of the seventh lens satisfy the following condition: 0.5 ≤ F6 / F7 ≤ 1.

2.

33. The optical lens according to any one of claims 1 to 18, characterized in that, The focal length F7 of the seventh lens and the focal length F8 of the eighth lens satisfy the following condition: 0.3 ≤ F7 / F8 ≤ 1.

5.

34. The optical lens according to any one of claims 1 to 18, characterized in that, The minimum center thickness dn among the first lens to the eighth lens and the maximum center thickness dm among the first lens to the eighth lens satisfy the following condition: 0.28≤dn / dm≤0.

843.

35. The optical lens according to any one of claims 1 to 18, characterized in that, The focal length F5 of the fifth lens satisfies the following relationship with the total focal length F of the optical lens: |F5 / F|≤4.

36. The optical lens according to any one of claims 1 to 18, characterized in that, The focal length F6 of the sixth lens satisfies the following relationship with the total focal length F of the optical lens: |F6 / F|≤7.

37. The optical lens according to any one of claims 1 to 18, characterized in that, The total focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy the following condition: 1.982 ≤ F / ENPD < 4.

38. The optical lens according to any one of claims 1 to 18, characterized in that, The radius of curvature R8 of the second side surface of the fourth lens and the optical back focal length of the optical lens, i.e. the distance BFL from the center of the second side surface of the last lens of the optical lens to the center of the second side surface of the optical lens, satisfy the following condition: 2.373≥|BEL / R8|≥0.

6.

39. The optical lens according to any one of claims 1 to 18, characterized in that, The radius of curvature R8 of the second side of the fourth lens satisfies the following relationship with the total focal length F of the optical lens: -0.764 ≥ R8 / F ≥ -2.

5.

40. The optical lens according to any one of claims 1 to 18, characterized in that, The optical lens satisfies at least one of the following conditions: The maximum field of view (FOV) of the optical lens, the total focal length (F) of the optical lens, and the image height (H) corresponding to the maximum field of view of the optical lens satisfy the following relationship: 56.447° ≤ (FOV) F) / H≤65°; The total focal length F of the optical lens and the total focal length F of the optical lens relative to the exit pupil position EXPP of the second side satisfy the following condition: 0.046≤|F / EXPP|≤0.25; The focal length F5 of the fifth lens satisfies the following relationship with the total focal length F of the optical lens: 1.602≤|F5 / F|≤4; The focal length F6 of the sixth lens satisfies the following relationship with the total focal length F of the optical lens: 3.201≤|F6 / F|≤7.

41. The optical lens according to any one of claims 1 to 18, characterized in that, The optical lens satisfies at least one of the following conditions: The focal length F6 of the sixth lens and the focal length F7 of the seventh lens satisfy the following condition: 0.7≤F6 / F7≤1; The focal length F7 of the seventh lens and the focal length F8 of the eighth lens satisfy the following condition: 0.5 ≤ F7 / F8 ≤ 1.

3.

42. The optical lens according to any one of claims 1 to 18, characterized in that, The optical lens satisfies at least one of the following conditions: The total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the second side of the optical lens, satisfies the following condition with respect to the total focal length F of the optical lens: 4.822≤TTL / F≤5.42; The total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the second side of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy the following: 0.192(1 / °)≤TTL / H / FOV≤0.3(1 / °); The total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the second side of the optical lens, satisfies the following condition with respect to the maximum aperture DMAX of the optical lens: 3.133≤TTL / DMAX≤4.7; The lens group length of the optical lens, i.e., the distance TL from the center of the first side of the first lens to the center of the second side of the last lens of the optical lens, satisfies the following condition with respect to the maximum aperture D1 of the first side of the first lens corresponding to the maximum field of view of the optical lens: 3.500≥TL / D1≥2.2; The lens group length of the optical lens, i.e., the distance TL from the center of the first side of the first lens to the center of the second side of the last lens of the optical lens, satisfies the following condition with respect to the maximum aperture D15 of the first side of the eighth lens corresponding to the maximum field of view of the optical lens: 2.302≥TL / D15≥1.

4. The image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian value θ of the maximum field of view of the optical lens satisfy the following relationship: 0.005 ≤ |HF θ) / (F θ)|≤0.076; The optical back focal length of the optical lens, i.e., the distance BFL from the center of the second side of the last lens of the optical lens to the center of the second side of the optical lens, and the optical total length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the second side of the optical lens, satisfy the following condition: 0.362≥BFL / TTL≥0.3; The optical back focal length of the optical lens, i.e., the distance BFL from the center of the second side of the last lens of the optical lens to the center of the second side of the optical lens, and the lens group length of the optical lens, i.e., the distance TL from the center of the first side of the first lens to the center of the second side of the last lens of the optical lens, satisfy the following condition: 0.568≥BFL / TL≥0.45; The maximum field of view (FOV) of the optical lens, the total focal length (F) of the optical lens, and the image height (H) corresponding to the maximum field of view of the optical lens satisfy the following relationship: 56.447° ≤ (FOV) F) / H≤63°; The total focal length F of the optical lens and the total focal length F of the optical lens relative to the exit pupil position EXPP of the second side satisfy the following condition: 0.046≤|F / EXPP|≤0.1; The maximum aperture D16 of the second side of the eighth lens corresponding to the maximum field of view of the optical lens, the optical back focal length of the optical lens (i.e., the distance BFL from the center of the second side of the last lens of the optical lens to the center of the second side of the optical lens), and the image height H corresponding to the maximum field of view of the optical lens satisfy the following relationship: 64.497 ≥ D16 BFL / H≥50; The focal length F8 of the eighth lens satisfies the following relationship with the total focal length F of the optical lens: 6.168 ≥ F8 / F ≥ 3; The distance d7 from the aperture stop to the center of the cemented doublet formed by the fourth and fifth lenses satisfies the following relationship with the lens group length of the optical lens, i.e., the distance TL from the center of the first side of the first lens to the center of the second side of the last lens of the optical lens: 0.875≥d7 / TL≥0.08; The combined focal length F45 of the fourth lens and the fifth lens satisfies the following relationship with the overall focal length F of the optical lens: 5.131 ≥ |F45| / F ≥ 1.5; The minimum center thickness dn among the first lens to the eighth lens and the maximum center thickness dm among the first lens to the eighth lens satisfy the following condition: 0.33≤dn / dm≤0.843; The focal length F5 of the fifth lens satisfies the following relationship with the total focal length F of the optical lens: 1.602 ≤ |F5 / F| ≤ 2.5; The focal length F6 of the sixth lens satisfies the following relationship with the total focal length F of the optical lens: 3.201 ≤ |F6 / F| ≤ 5.4; The total focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy the following relationship: 1.982≤F / ENPD<3; The radius of curvature R8 of the second side surface of the fourth lens and the optical back focal length of the optical lens, i.e. the distance BFL from the center of the second side surface of the last lens of the optical lens to the center of the second side surface of the optical lens, satisfy the following condition: 2.373≥|BEL / R8|≥0.98; The radius of curvature R8 of the second side of the fourth lens satisfies the following relationship with the total focal length F of the optical lens: -0.764≥R8 / F≥-1.

43. The optical lens according to any one of claims 1 to 18, characterized in that, The optical lens satisfies at least one of the following conditions: The total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the second side of the optical lens, satisfies the following condition with respect to the total focal length F of the optical lens: 4.822≤TTL / F≤5.

364. The total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the second side of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy the following: 0.192(1 / °)≤TTL / H / FOV≤0.204(1 / °); The total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the second side of the optical lens, satisfies the following condition with respect to the maximum aperture DMAX of the optical lens: 3.133≤TTL / DMAX≤3.511; The lens group length of the optical lens, i.e., the distance TL from the center of the first side of the first lens to the center of the second side of the last lens of the optical lens, satisfies the following condition with respect to the maximum aperture D1 of the first side of the first lens corresponding to the maximum field of view of the optical lens: 3.500≥TL / D1≥2.

897. The lens group length of the optical lens, i.e., the distance TL from the center of the first side of the first lens to the center of the second side of the last lens of the optical lens, satisfies the following condition with respect to the maximum aperture D15 of the first side of the eighth lens corresponding to the maximum field of view of the optical lens: 2.302≥TL / D15≥2.

069. The image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian value θ of the maximum field of view of the optical lens satisfy the following relationship: 0.005 ≤ |HF θ) / (F θ)|≤0.062; The optical back focal length of the optical lens, i.e., the distance BFL from the center of the second side of the last lens of the optical lens to the center of the second side of the optical lens, and the optical total length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the second side of the optical lens, satisfy the following condition: 0.362≥BFL / TTL≥0.

350. The optical back focal length of the optical lens, i.e., the distance BFL from the center of the second side of the last lens of the optical lens to the center of the second side of the optical lens, and the lens group length of the optical lens, i.e., the distance TL from the center of the first side of the first lens to the center of the second side of the last lens of the optical lens, satisfy the following condition: 0.568≥BFL / TL≥0.

538. The maximum field of view (FOV) of the optical lens, the total focal length (F) of the optical lens, and the image height (H) corresponding to the maximum field of view of the optical lens satisfy the following relationship: 56.447° ≤ (FOV) F) / H≤61.070°; The total focal length F of the optical lens and the total focal length F of the optical lens relative to the exit pupil position EXPP of the second side satisfy the following condition: 0.046≤|F / EXPP|≤0.089; The maximum aperture D16 of the second side of the eighth lens corresponding to the maximum field of view of the optical lens, the optical back focal length of the optical lens (i.e., the distance BFL from the center of the second side of the last lens of the optical lens to the center of the second side of the optical lens), and the image height H corresponding to the maximum field of view of the optical lens satisfy the following relationship: 64.497 ≥ D16 BFL / H ≥ 56.786; The focal length F8 of the eighth lens satisfies the following relationship with the total focal length F of the optical lens: 6.168 ≥ F8 / F ≥ 3.173; The distance d7 from the aperture stop to the center of the cemented doublet formed by the fourth lens and the fifth lens satisfies the following relationship with the lens group length of the optical lens, i.e., the distance TL from the center of the first side of the first lens to the center of the second side of the last lens of the optical lens: 0.875≥d7 / TL≥0.376; The combined focal length F45 of the fourth lens and the fifth lens satisfies the following relationship with the total focal length F of the optical lens: 5.131 ≥ |F45| / F ≥ 1.709; The focal length F6 of the sixth lens and the focal length F7 of the seventh lens satisfy the following condition: 0.831≤F6 / F7≤0.968; The focal length F7 of the seventh lens and the focal length F8 of the eighth lens satisfy the following condition: 0.646≤F7 / F8≤1.310; The minimum center thickness dn among the first lens to the eighth lens and the maximum center thickness dm among the first lens to the eighth lens satisfy the following condition: 0.396≤dn / dm≤0.843; The focal length F5 of the fifth lens satisfies the following relationship with the total focal length F of the optical lens: 1.602 ≤ |F5 / F| ≤ 2.003; The focal length F6 of the sixth lens satisfies the following relationship with the total focal length F of the optical lens: 3.201≤|F6 / F|≤4.055; The total focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy the following relationship: 1.982≤F / ENPD≤2.010; The radius of curvature R8 of the second side surface of the fourth lens and the optical back focal length of the optical lens, i.e., the distance BFL from the center of the second side surface of the last lens of the optical lens to the center of the second side surface of the optical lens, satisfy the following condition: 2.373≥|BEL / R8|≥1.252; The radius of curvature R8 of the second side of the fourth lens satisfies the following relationship with the total focal length F of the optical lens: -0.764≥R8 / F≥-1.

552.

44. An electronic device, characterized in that, It includes an optical lens according to any one of claims 1 to 43 and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

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