Optical lens and electronic device

Abstract

The application provides an optical lens and an electronic device. The optical lens comprises: a first lens with negative optical power, a first side of the first lens being a convex surface and a second side being a concave surface; a second lens with negative optical power, a second side of the second lens being a concave surface; a third lens with optical power; a fourth lens with positive optical power, a second side of the fourth lens being a convex surface; a fifth lens with negative optical power, a first side of the fifth lens being a concave surface; a sixth lens with positive optical power, a second side of the sixth lens being a convex surface; a seventh lens with positive optical power, a first side of the seventh lens being a convex surface and a second side being a convex surface; and an eighth lens with positive optical power, a first side of the eighth lens being a convex surface. The application solves the problem that the optical lens in the prior art cannot simultaneously consider small projection ratio, small telecentricity, long back focal length, high resolution, high light throughput, low sensitivity, good temperature performance and high production yield.

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 technology, the demand for optical lenses in daily life is increasing, and optical lenses are being applied in more and more scenarios. At the same time, more and more fields require optical lenses to act as "eyes," such as automotive, surveillance, projection, and industrial applications. As demand grows and technology advances, the performance requirements for optical lenses are becoming increasingly diverse. For example, in projection optical lenses, also known as projection lenses, 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 projection effects, simple projection systems can no longer meet the higher imaging performance requirements.

[0003] Existing technologies offer several optical lenses, but these lenses suffer from various problems that make it difficult to meet field-of-view requirements. For example, existing optical lenses have a large throw ratio, resulting in a long projection distance for a fixed projection size, which cannot meet the requirements of the PGU space; existing optical lenses have a large telecentricity, making them unsuitable for telecentric illumination systems, exhibiting high sensitivity, and leading to low system efficiency; existing optical lenses have a short back focal length, failing to meet illumination installation requirements and hindering the achievement of high light throughput; existing large FOV object-side telecentric projection lenses cannot meet resolution requirements above 36 lp / mm, thus failing to achieve high resolution; and existing optical lenses, in order to reduce costs, have relaxed component processing tolerances, resulting in low finished product yields, and their resolution and temperature performance also fail to meet requirements.

[0004] In other words, existing optical lenses suffer from the problem of not being able to simultaneously achieve a small projection ratio, small telecentricity, long back focal length, high resolution, high light transmission, low sensitivity, good temperature performance, and high production yield. Summary of the Invention

[0005] The main objective of this invention is to provide an optical lens and electronic device that solves the problem that existing optical lenses have difficulty simultaneously achieving small projection ratio, small telecentricity, long back focal length, high resolution, high light transmission, low sensitivity, good temperature performance, and high production yield.

[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 negative optical power, wherein a first side surface of the first lens is convex and a second side surface is concave; a second lens having negative optical power, wherein a second side surface of the second lens is concave; a third lens having optical power; a fourth lens having positive optical power, wherein a second side surface of the fourth lens is convex; a fifth lens having negative optical power, wherein a first side surface of the fifth lens is concave; a sixth lens having positive optical power, wherein a second side surface of the sixth lens is convex; a seventh lens having positive optical power, wherein a first side surface of the seventh lens is convex and a second side surface is convex; and an eighth lens having positive optical power, wherein a first side surface of the eighth lens is convex.

[0007] Furthermore, the first side surface of the second lens is convex.

[0008] Furthermore, the first side surface of the second lens is concave.

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

[0010] Furthermore, the third lens has negative optical power, and the first side of the third lens is convex, while the second side is concave.

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

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

[0013] Furthermore, the second side surface of the fifth lens is concave.

[0014] Furthermore, the second side surface of the fifth lens is convex.

[0015] Furthermore, the first side surface of the sixth lens is convex.

[0016] Furthermore, the first side surface of the sixth lens is concave.

[0017] Furthermore, the second side surface of the eighth lens is convex.

[0018] Furthermore, the second side surface of the eighth lens is concave.

[0019] Furthermore, the first lens is an aspherical lens.

[0020] Furthermore, the fifth lens and the sixth lens are cemented together to form a cemented doublet lens.

[0021] Furthermore, the optical lens also includes an aperture stop, which is positioned between the fourth lens and the fifth lens.

[0022] Furthermore, the front focal length f(1-4) of the optical lens and the total focal length F of the optical lens satisfy the following condition: 1.4≤|f(1-4)| / F≤23.

[0023] Furthermore, the rear focal length f(5-8) of the optical lens satisfies the following relationship with the total focal length F of the optical lens: 0.9≤|f(5-8)| / F≤5.8.

[0024] Furthermore, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy the following condition: 0.59 ≤ |f1 / f2| ≤ 3.1.

[0025] Furthermore, the focal length f2 of the second lens and the focal length f3 of the third lens satisfy the following condition: |f2 / f3|≤1.85.

[0026] Furthermore, the focal length f3 of the third lens satisfies the following relationship with the total focal length F of the optical lens: |f3 / F|≥2.55.

[0027] 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|≥2.89.

[0028] Furthermore, the sag of the first side surface of the first lens, SAG(S1), and the sag of the second side surface of the first lens, SAG(S2), satisfy the following condition: 0.21≤SAG(S1) / SAG(S2)≤0.81.

[0029] Furthermore, the total focal length F of the optical lens and the exit pupil position EXPP of the total focal length F of the optical lens relative to the object plane are: |F / EXPP|≤0.5.

[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 imaging plane, satisfies the following condition: BFL / TTL≥0.25.

[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 image plane, 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 of the optical lens to the center of the second side of the last lens of the optical lens: BFL / TL≥0.3.

[0032] Furthermore, the focal length f7 of the seventh lens and the focal length f8 of the eighth lens satisfy the following condition: 0.13≤f7 / f8≤4.7.

[0033] Furthermore, the minimum absolute value fn among the focal length values ​​of the first lens to the eighth lens and the maximum absolute value fm among the focal length values ​​of the first lens to the eighth lens satisfy the following condition: |fn| / |fm|≥0.05.

[0034] Furthermore, the total focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy the following relationship: 1≤F / ENPD≤5.

[0035] Furthermore, the focal length value f1 of the first lens and the total focal length value F of the optical lens satisfy the following condition: 2.41≤|f1 / F|≤5.5.

[0036] Furthermore, the total focal length F of the optical lens and the radius of curvature R22 of the second side surface of the second lens satisfy the following condition: 0.16≤|F / R22|≤1.95.

[0037] Furthermore, the center thickness d10 of the fifth lens, the center thickness d11 of the sixth lens, and 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 imaging plane of the optical lens, satisfy the following condition: 0.03≤(d10+d11) / TTL≤0.46.

[0038] Furthermore, the minimum center thickness dn of the first to eighth lenses and the maximum center thickness dm of the first to eighth lenses satisfy the following condition: dn / dm≥0.06.

[0039] Furthermore, the total optical length of the optical lens, that is, the distance TTL from the center of the first side of the first lens of the optical lens to the center of the second side imaging plane of the optical lens, satisfies the following condition with respect to the total focal length F of the optical lens: TTL / F≤15.

[0040] Furthermore, the optical back focal length of the optical lens, that is, 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 imaging plane, satisfies the following condition with respect to the total focal length F of the optical lens: 1.89≤BFL / F≤7.

[0041] Furthermore, the rear focal length f(5-8) of the optical lens and the total optical length of the optical lens, i.e. the distance TTL from the center of the first side of the first lens of the optical lens to the center of the second side imaging plane of the optical lens, satisfy the following: |f(5-8)| / TTL≥0.06.

[0042] 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 negative optical power; a second lens having negative optical power; a third lens having optical power; a fourth lens having positive optical power; a fifth lens having negative 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 front group focal length f(1-4) of the optical lens satisfies the following relationship with the total group focal length F of the optical lens: 1.4≤|f(1-4)| / F≤23.

[0043] Furthermore, the first side surface of the first lens is convex, and the second side surface is concave.

[0044] Furthermore, the first side surface of the second lens is convex, and the second side surface is concave.

[0045] Furthermore, the first side surface of the second lens is concave, and the second side surface is concave.

[0046] Furthermore, the third lens has positive optical power, and the first side of the third lens is concave and the second side is convex.

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

[0048] Furthermore, the first side of the fourth lens is concave, and the second side is convex.

[0049] Furthermore, the first side surface of the fourth lens is convex, and the second side surface is convex.

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

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

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

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

[0054] Furthermore, the first side surface of the seventh lens is convex, and the second side surface is convex.

[0055] Furthermore, the first side surface of the eighth lens is convex, and the second side surface is convex.

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

[0057] Furthermore, the first lens is an aspherical lens.

[0058] Furthermore, the fifth lens and the sixth lens are cemented together to form a cemented doublet lens.

[0059] Furthermore, the optical lens also includes an aperture stop, which is positioned between the fourth lens and the fifth lens.

[0060] Furthermore, the rear focal length f(5-8) of the optical lens satisfies the following relationship with the total focal length F of the optical lens: 0.9≤|f(5-8)| / F≤5.8.

[0061] Furthermore, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy the following condition: 0.59 ≤ |f1 / f2| ≤ 3.1.

[0062] Furthermore, the focal length f2 of the second lens and the focal length f3 of the third lens satisfy the following condition: |f2 / f3|≤1.85.

[0063] Furthermore, the focal length f3 of the third lens satisfies the following relationship with the total focal length F of the optical lens: |f3 / F|≥2.55.

[0064] 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|≥2.89.

[0065] Furthermore, the sag of the first side surface of the first lens, SAG(S1), and the sag of the second side surface of the first lens, SAG(S2), satisfy the following condition: 0.21≤SAG(S1) / SAG(S2)≤0.81.

[0066] Furthermore, the total focal length F of the optical lens and the exit pupil position EXPP of the total focal length F of the optical lens relative to the object plane are: |F / EXPP|≤0.5.

[0067] 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 imaging plane, satisfies the following condition: BFL / TTL≥0.25.

[0068] 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 imaging plane, 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 of the optical lens to the center of the second side of the last lens of the optical lens: BFL / TL≥0.3.

[0069] Furthermore, the focal length f7 of the seventh lens and the focal length f8 of the eighth lens satisfy the following condition: 0.13≤f7 / f8≤4.7.

[0070] Furthermore, the minimum absolute value fn among the focal length values ​​of the first lens to the eighth lens and the maximum absolute value fm among the focal length values ​​of the first lens to the eighth lens satisfy the following condition: |fn| / |fm|≥0.05.

[0071] Furthermore, the total focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy the following relationship: 1≤F / ENPD≤5.

[0072] Furthermore, the focal length value f1 of the first lens and the total focal length value F of the optical lens satisfy the following condition: 2.41≤|f1 / F|≤5.5.

[0073] Furthermore, the total focal length F of the optical lens and the radius of curvature R22 of the second side surface of the second lens satisfy the following condition: 0.16≤|F / R22|≤1.95.

[0074] Furthermore, the center thickness d10 of the fifth lens, the center thickness d11 of the sixth lens, and 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 imaging plane of the optical lens, satisfy the following condition: 0.03≤(d10+d11) / TTL≤0.46.

[0075] Furthermore, the minimum center thickness dn of the first to eighth lenses and the maximum center thickness dm of the first to eighth lenses satisfy the following condition: dn / dm≥0.06.

[0076] 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 of the optical lens to the center of the second side imaging plane of the optical lens, satisfies the following condition with respect to the total focal length F of the optical lens: TTL / F≤15.

[0077] Furthermore, the optical back focal length of the optical lens, that is, 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 imaging plane, satisfies the following condition with respect to the total focal length F of the optical lens: 1.89≤BFL / F≤7.

[0078] Furthermore, the rear focal length f(5-8) of the optical lens and the total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens of the optical lens to the center of the second side imaging plane of the optical lens, satisfy the following: |f(5-8)| / TTL≥0.06.

[0079] 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.

[0080] 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 negative optical power, a second lens with negative optical power, a third lens with optical power, a fourth lens with positive optical power, a fifth lens with negative 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 first side of the first lens is convex and the second side is concave; the second side of the second lens is concave; the second side of the fourth lens is convex; the first side of the fifth lens is concave; the second side of the sixth lens is convex; the first side of the seventh lens is convex and the second side is convex; and the first side of the eighth lens is convex.

[0081] The first lens has negative optical power. Its first side is convex, and its second side is concave. The first lens is an even-order aspherical lens with negative optical power. It adjusts the angle of light rays, optimizing the divergence angle and correcting system distortion. The convex design of the first side reduces the interference of water droplets on image quality in rainy applications. The concave design of the second side allows for the collection of light rays from a large field of view into the rear optical system, ensuring that diverging light rays enter smoothly and further smoothing the light path.

[0082] The second lens has negative optical power, further diverging the light and adjusting the light refraction angle. Combined with the positive optical power third lens, it corrects chromatic aberration. The first side of the second lens can be either convex or concave, while the second side is concave. When the first side of the second lens is convex, the light deflection upon reaching the imaging plane is smaller, resulting in more concentrated light upon arrival. This defocusing corrects edge field aberrations, achieving high resolution, while minimizing light energy loss and reducing lens sensitivity. When the first side of the second lens is concave, the double-concave design helps reduce system sensitivity. The concave first side causes a significant light reversal upon entry, clearly distinguishing edge and center rays in each field of view. This alters the trend of edge rays, facilitating aberration correction between center and edge rays in each field of view, and ultimately contributing to high resolution.

[0083] The optical power of the third lens can be positive or negative. When the third lens has a positive optical power, it can converge the light and adjust the angle of the light, so that the light path can smoothly transition to the rear, which helps to reduce the sensitivity of the system. When the third lens has a negative optical power, it can diverge the light and adjust the angle of the light, which helps to allow light with a large field of view to enter the optical system, which helps to optimize the large FOV system.

[0084] The fourth lens has positive optical power, converging light and adjusting its angle to ensure a smooth transition of light rays to the rear, thus reducing system sensitivity. The first side of the fourth lens can be either concave or convex, while the second side is convex. When the first side of the fourth lens is concave, it is closer to the aperture stop, which helps collect more light and increases the system's light transmission capacity. When the second side of the fourth lens is convex, it is closer to the aperture stop; the biconvex shape and similar curvature of the two sides further enhance light collection and increase the system's light transmission capacity.

[0085] The fifth lens has negative optical power. Its first side is concave, while its second side can be either concave or convex. When the second side of the fifth lens is concave, it is paired with a biconcave sixth lens (which has positive optical power) to correct chromatic aberration and reduce system sensitivity. When the second side of the fifth lens is convex, it is paired with a concave-convex sixth lens (which has positive optical power) to correct chromatic aberration and reduce the system aperture.

[0086] The sixth lens has positive optical power. Its first side can be either convex or concave, and its second side is convex. When the first side of the sixth lens is convex, its biconvex shape, when paired with the preceding biconcave fifth lens with negative optical power, is beneficial for correcting chromatic aberration. When the first side of the sixth lens is concave, its concave-convex shape, when paired with the preceding concave-convex fifth lens with negative optical power, is also beneficial for correcting chromatic aberration.

[0087] The seventh lens has positive optical power, optimizes the system's telecentricity and corrects system distortion, making the system an object-side telecentric system. The first side of the seventh lens is convex, and the second side is also convex. The biconvex shape is beneficial for reducing the rear port diameter.

[0088] 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, combined with positive optical power, it optimizes 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 second side also facilitates structural design and prevents interference from edge structures during focusing. When the second side of the eighth lens is concave, combined with positive optical power, it optimizes the system's telecentricity. Adjusting the lens shape to biconvex ensures a smooth transition of light rays to the rear, reducing system sensitivity. The concave second side also facilitates structural design and prevents scratches on the optical surface during placement.

[0089] 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 small projection ratio (large FOV angle), small telecentricity, long back focal length, high resolution, low sensitivity, and high mass production yield. Attached Figure Description

[0090] 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:

[0091] Figure 1 A schematic diagram of the structure of an optical lens of Example 1 of the present invention is shown;

[0092] Figure 2 A schematic diagram of the structure of the optical lens of Example 2 of the present invention is shown;

[0093] Figure 3 A schematic diagram of the structure of the optical lens of Example 3 of the present invention is shown;

[0094] Figure 4 A schematic diagram of the structure of the optical lens of Example 4 of the present invention is shown;

[0095] Figure 5 A schematic diagram of the structure of the optical lens of Example 5 of the present invention is shown;

[0096] Figure 6 A schematic diagram of the structure of the optical lens of Example Six of the present invention is shown;

[0097] Figure 7 A schematic diagram of the structure of the optical lens of Example Seven of the present invention is shown;

[0098] Figure 8 A schematic diagram of the structure of the optical lens of Example 8 of the present invention is shown;

[0099] Figure 9 A schematic diagram of the structure of the optical lens of Example 9 of the present invention is shown;

[0100] Figure 10 A schematic diagram of the structure of the optical lens of Example 10 of the present invention is shown.

[0101] The above figures include the following reference numerals:

[0102] L1, First lens; S1, First side surface of the first lens; S2, Second side surface of the first lens; L2, Second lens; S3, First side surface of the second lens; S4, Second side surface of the second lens; L3, Third lens; S5, First side surface of the third lens; S6, Second side surface of the third lens; L4, Fourth lens; S7, First side surface of the fourth lens; S8, Second side surface of the fourth lens; STO, Aperture stop; L5, Fifth lens; S10, First side surface of the fifth lens; S11, Second side surface of the fifth lens; L6, Sixth lens; S11, First side surface of the sixth lens; S12, Second side surface of the sixth lens; L7, Seventh lens; S13, First side surface of the seventh lens; S14, Second side surface of the seventh lens; L8, Eighth lens; S15, First side surface of the eighth lens; S16, Second side surface of the eighth lens; S17, First side surface of the protective glass; S18, Second side surface of the protective glass; IMA, Imaging plane. Detailed Implementation

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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 determination of the surface shape in the paraxial region can be based on the judgment method commonly used by those knowledgeable 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.

[0109] 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.

[0110] 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.

[0111] 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 second side of the optical lens can be the image source side, and the first side can be the imaging side. Light from the image source side can be imaged on the imaging side, and the imaging surface of the optical lens is the image source surface.

[0112] To address the problem that existing optical lenses often suffer from difficulty in simultaneously achieving small projection ratio, small telecentricity, long back focal length, high resolution, high light transmission, low sensitivity, good temperature performance, and high production yield, this invention provides an optical lens and an electronic device.

[0113] Example 1

[0114] like Figures 1 to 10As shown, the optical lens, from the first side to the second side, includes a first lens with negative optical power, a second lens with negative optical power, a third lens with optical power, a fourth lens with positive optical power, a fifth lens with negative 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 first side of the first lens is convex and the second side is concave; the second side of the second lens is concave; the second side of the fourth lens is convex; the first side of the fifth lens is concave; the second side of the sixth lens is convex; the first side of the seventh lens is convex and the second side is convex; and the first side of the eighth lens is convex.

[0115] The first lens has negative optical power. Its first side is convex, and its second side is concave. The first lens is an even-order aspherical lens with negative optical power. It adjusts the angle of light rays, optimizing the divergence angle and correcting system distortion. The convex design of the first side reduces the interference of water droplets on image quality in rainy applications. The concave design of the second side allows for the collection of light rays from a large field of view into the rear optical system, ensuring that diverging light rays enter smoothly and further smoothing the light path.

[0116] The second lens has negative optical power, further diverging the light and adjusting the light refraction angle. Combined with the positive optical power third lens, it corrects chromatic aberration. The first side of the second lens can be either convex or concave, while the second side is concave. When the first side of the second lens is convex, the light deflection upon reaching the imaging plane is smaller, resulting in more concentrated light upon arrival. This defocusing corrects edge field aberrations, achieving high resolution, while minimizing light energy loss and reducing lens sensitivity. When the first side of the second lens is concave, the double-concave design helps reduce system sensitivity. The concave first side causes a significant light reversal upon entry, clearly distinguishing edge and center rays in each field of view. This alters the trend of edge rays, facilitating aberration correction between center and edge rays in each field of view, and ultimately contributing to high resolution.

[0117] The optical power of the third lens can be positive or negative. When the third lens has a positive optical power, it can converge the light and adjust the angle of the light, so that the light path can smoothly transition to the rear, which helps to reduce the sensitivity of the system. When the third lens has a negative optical power, it can diverge the light and adjust the angle of the light, which helps to allow light with a large field of view to enter the optical system, which helps to optimize the large FOV system.

[0118] The fourth lens has positive optical power, converging light and adjusting its angle to ensure a smooth transition of light rays to the rear, thus reducing system sensitivity. The first side of the fourth lens can be either concave or convex, while the second side is convex. When the first side of the fourth lens is concave, it is closer to the aperture stop, which helps collect more light and increases the system's light transmission capacity. When the second side of the fourth lens is convex, it is closer to the aperture stop; the biconvex shape and similar curvature of the two sides further enhance light collection and increase the system's light transmission capacity.

[0119] The fifth lens has negative optical power. Its first side is concave, while its second side can be either concave or convex. When the second side of the fifth lens is concave, it is paired with a biconcave sixth lens (which has positive optical power) to correct chromatic aberration and reduce system sensitivity. When the second side of the fifth lens is convex, it is paired with a concave-convex sixth lens (which has positive optical power) to correct chromatic aberration and reduce the system aperture.

[0120] The sixth lens has positive optical power. Its first side can be either convex or concave, and its second side is convex. When the first side of the sixth lens is convex, its biconvex shape, when paired with the preceding biconcave fifth lens with negative optical power, is beneficial for correcting chromatic aberration. When the first side of the sixth lens is concave, its concave-convex shape, when paired with the preceding concave-convex fifth lens with negative optical power, is also beneficial for correcting chromatic aberration.

[0121] The seventh lens has positive optical power, optimizes the system's telecentricity and corrects system distortion, making the system an object-side telecentric system. The first side of the seventh lens is convex, and the second side is also convex. The biconvex shape is beneficial for reducing the rear port diameter.

[0122] 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, combined with positive optical power, it optimizes 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 second side also facilitates structural design and prevents interference from edge structures during focusing. When the second side of the eighth lens is concave, combined with positive optical power, it optimizes the system's telecentricity. Adjusting the lens shape to biconvex ensures a smooth transition of light rays to the rear, reducing system sensitivity. The concave second side also facilitates structural design and prevents scratches on the optical surface during placement.

[0123] 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 small projection ratio (large FOV angle), small telecentricity, long back focal length, high resolution, low sensitivity, and high mass production yield.

[0124] In this embodiment, the first side surface of the second lens is convex. When the first side surface of the second lens is convex, the light rays are deflected less when they reach the imaging surface, making them more concentrated upon arrival. This defocusing corrects edge field aberrations, achieving high resolution, while minimizing light energy loss and reducing lens sensitivity.

[0125] In this embodiment, the first side surface of the second lens is concave. When the first side surface of the second lens is concave, the double-concave shape helps to reduce system sensitivity. The concave first side surface of the second lens causes a significant light reversal after light enters, making the edge rays and center rays of each field of view distinct. This changes the trend of the edge rays, which is beneficial for aberration correction between the center and edge rays of each field of view, and helps to achieve high resolution.

[0126] In this embodiment, the third lens has positive optical power, with a concave first side and a convex second side. The positive optical power of the third lens converges light rays, adjusting the light angle to ensure a smooth transition of the light path to the rear, thus reducing system sensitivity. The concave-convex shape of the third lens also allows for a significantly smoother angle adjustment of the incident light, further improving system sensitivity and increasing production yield.

[0127] In this embodiment, the third lens has negative optical power, with a convex first side and a concave second side. The negative optical power of the third lens diverges the light rays, adjusting their angle and facilitating the entry of light rays into the optical system with a large field of view (FOV), thus optimizing the FOV system. The convex-concave shape of the third lens causes significant light deflection upon entry, further enhancing the entry of light rays into the optical system with a large FOV, altering the trend of edge light rays, and contributing to the optimization of the FOV system and the achievement of high resolution.

[0128] In this embodiment, the first side surface of the fourth lens is concave. When the first side surface of the fourth lens is concave, the fourth lens is close to the aperture stop, and the concave first side surface of the fourth lens helps to collect more light and increase the light transmission capability of the system.

[0129] In this embodiment, the first side surface of the fourth lens is convex. When the second side surface of the fourth lens is convex, the fourth lens is close to the aperture stop. The biconvex shape and the similar curvature of the two surfaces are conducive to collecting more light and increasing the light transmission capability of the system.

[0130] In this embodiment, the second side surface of the fifth lens is concave. When the second side surface of the fifth lens is concave, the biconcave shape, combined with the subsequent biconvex sixth lens of positive optical power, corrects chromatic aberration and reduces system sensitivity.

[0131] In this embodiment, the second side surface of the fifth lens is convex. When the second side surface of the fifth lens is convex, the sixth lens, which has a concave-convex shape and positive optical power, is paired with the concave-convex sixth lens to correct chromatic aberration, thereby reducing the system aperture.

[0132] In this embodiment, the first side surface of the sixth lens is convex. When the first side surface of the sixth lens is convex, its biconvex shape, combined with the biconcave fifth lens with negative optical power, is beneficial for correcting chromatic aberration.

[0133] In this embodiment, the first side surface of the sixth lens is concave. When the first side surface of the sixth lens is concave, its concave-convex shape, combined with the concave-convex fifth lens with negative optical power, is beneficial for correcting chromatic aberration.

[0134] In this embodiment, the second side surface of the eighth lens is convex. When the second side surface of the eighth lens is convex, the system telecentricity can be optimized when combined with positive optical power. The lens shape is adjusted to be biconvex so that the light path transitions smoothly to the rear, reducing system sensitivity. The convexity of the second side surface is beneficial to structural design and prevents interference from edge structures during focusing.

[0135] In this embodiment, the second side of the eighth lens is concave. When the second side of the eighth lens is concave, combined with the telecentricity of the positive optical power optimization system, the lens shape is adjusted to be biconvex, so that the light path transitions smoothly to the rear, reducing system sensitivity. The concave second side is beneficial to structural design and prevents the optical surface from being scratched during placement.

[0136] In this embodiment, the first lens is an aspherical lens. This configuration is beneficial for correcting field distortion and improving resolution.

[0137] In this embodiment, the fifth and sixth lenses are cemented together to form a cemented doublet lens. The use of a cemented doublet lens effectively eliminates the influence of ghosting on the optical lens and corrects chromatic aberration, ensuring high resolution while eliminating ghosting. The fifth lens has negative optical power, which, combined with the positive optical power of the subsequent sixth lens, corrects chromatic aberration. The negative fifth lens in the cemented doublet has a higher refractive index (relative to the positive sixth lens), allowing light to converge effectively and smoothly at the final point, ensuring a stable light path to the imaging plane, reducing overall weight and cost; reducing light loss caused by inter-lens reflections; and the combination of high and low refractive indices facilitates rapid transition of light from the front, increasing the aperture and light transmission, thus supporting high-efficiency projection requirements. Furthermore, the use of a cemented doublet reduces the air gap between the two lenses, making the overall optical system structure more compact and reducing tolerance sensitivity issues such as overall eccentricity of the lens units during assembly.

[0138] In this embodiment, the optical lens also includes an aperture stop, which is positioned between the fourth lens and the fifth lens. Placing the aperture stop in the middle position facilitates the effective focusing of light 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 assembly sensitivity of the system.

[0139] In this embodiment, the front focal length f(1-4) of the optical lens and the total focal length F of the optical lens satisfy the following relationship: 1.4 ≤ |f(1-4)| / F ≤ 23. By reasonably adjusting the front focal length, the smaller the ratio of the front focal length to the total focal length, the more beneficial it is to the divergence of the front light, thereby optimizing the large FOV system. It should be noted here that the front focal length f(1-4) refers to the combined focal length of the first to fourth lenses. Preferably, 1.9 ≤ |f(1-4)| / F ≤ 20.

[0140] In this embodiment, the rear focal length f(5-8) of the optical lens and the total focal length F of the optical lens satisfy the following relationship: 0.9 ≤ |f(5-8)| / F ≤ 5.8. By reasonably adjusting the rear focal length, a larger ratio between the rear focal length and the total focal length is beneficial for a smoother transition of light, and adjusting the principal ray angle is beneficial for optimizing telecentricity. It should be noted here that the rear focal length f(5-8) refers to the combined focal length of the fifth to eighth lenses. Preferably, 1.3 ≤ |f(5-8)| / F ≤ 3.1.

[0141] In this embodiment, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy the condition: 0.59 ≤ |f1 / f2| ≤ 3.1. 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, 0.76 ≤ |f1 / f2| ≤ 2.2.

[0142] In this embodiment, the focal length f2 of the second lens and the focal length f3 of the third lens satisfy the condition: |f2 / f3|≤1.85. By reasonably adjusting the focal lengths of the positive and negative lenses, the smaller the ratio of the negative focal length of the second lens to the positive focal length of the third lens, the more beneficial it is to optimize the large FOV system. Preferably, |f2 / f3|≤1.

[0143] In this embodiment, the focal length f3 of the third lens and the total focal length F of the optical lens satisfy the condition: |f3 / F|≥2.55. By reasonably adjusting the ratio of the focal length of the third lens to the total focal length, a larger ratio is more conducive to the smooth emission of edge light in a large FOV system, thus improving resolution. Preferably, |f3 / F|≥3.25.

[0144] In this embodiment, the focal length f8 of the eighth lens and the total focal length F of the optical lens satisfy the following relationship: |f8 / F|≥2.89. By reasonably adjusting the ratio of the focal length of the eighth lens to the total focal length, a larger ratio is beneficial for a smoother transition of light, and adjusting the principal ray angle is beneficial for optimizing telecentricity. Preferably, |f8 / F|≥3.78.

[0145] In this embodiment, the sagitta SAG(S1) of the first side surface of the first lens and the sagitta SAG(S2) of the second side surface of the first lens satisfy the following condition: 0.21 ≤ SAG(S1) / SAG(S2) ≤ 0.81. By reasonably adjusting the curvature of the first lens, it is beneficial to collect a large amount of light while correcting edge field-of-view distortion, which is beneficial to the optimization of the large FOV system. Preferably, 0.4 ≤ SAG(S1) / SAG(S2) ≤ 0.74.

[0146] In this embodiment, the total focal length F of the optical lens and the exit pupil position EXPP of the total focal length F relative to the object plane are: |F / EXPP|≤0.5. If this condition is satisfied, the object plane is located on the second side, and the farther the exit pupil position is relative to the first image plane, the smaller the telecentricity. Preferably, |F / EXPP|≤0.35.

[0147] 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 imaging plane, satisfies the condition that BFL / TTL ≥ 0.25 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 of the optical lens to the center of the second side imaging plane. Satisfying this condition ensures a long back focal length while achieving miniaturization, which is beneficial for module assembly. Preferably, BFL / TTL ≥ 0.3.

[0148] 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 imaging plane, satisfies the condition that BFL / TL ≥ 0.3 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. Satisfying this condition ensures a long back focal length while achieving miniaturization, which is beneficial for module assembly; a short lens group length (TL) helps ensure a compact structure, reduces the lens's sensitivity to MTF, improves production yield, and reduces production costs. Preferably, BFL / TL ≥ 0.4.

[0149] In this embodiment, the focal length f7 of the seventh lens and the focal length f8 of the eighth lens satisfy the condition: 0.13 ≤ f7 / f8 ≤ 4.7. Satisfying this condition helps ensure that the focal lengths of adjacent lenses are similar, facilitates a smooth light transition, and improves image quality. Preferably, 0.26 ≤ f7 / f8 ≤ 2.5.

[0150] In this embodiment, the minimum absolute value fn among the focal length values ​​of the first lens to the eighth lens and the maximum absolute value fm among the focal length values ​​of the first lens to the eighth lens satisfy the condition: |fn| / |fm|≥0.05. Satisfying this condition helps to ensure that the difference in focal length between the lenses is smaller, and the even distribution of focal lengths helps to reduce the sensitivity of the lenses. Preferably, |fn| / |fm|≥0.08.

[0151] 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: 1 ≤ F / ENPD ≤ 5. Satisfying this condition helps to ensure a small FNO and increases the amount of light transmitted. Preferably, 1.5 ≤ F / ENPD ≤ 3.

[0152] In this embodiment, the focal length f1 of the first lens and the total focal length F of the optical lens satisfy the condition: 2.41 ≤ |f1 / F| ≤ 5.5. Satisfying this condition facilitates the rational allocation of the focal length of the first lens and allows light rays with a large field of view to enter the optical system, thereby achieving high resolution. Preferably, 2.67 ≤ |f1 / F| ≤ 4.3.

[0153] In this embodiment, the overall focal length F of the optical lens and the radius of curvature R22 of the second side surface of the second lens satisfy the following relationship: 0.16 ≤ |F / R22| ≤ 1.95. By reasonably setting the surface curvature of the second lens, incident light can be assisted in entering the optical system, and astigmatism can be effectively corrected to improve image quality. Preferably, 0.4 ≤ |F / R22| ≤ 1.56.

[0154] In this embodiment, the center thickness d10 of the fifth lens, the center thickness d11 of the sixth lens, and 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 imaging plane of the optical lens, satisfy the following condition: 0.03 ≤ (d10 + d11) / TTL ≤ 0.46. By reasonably setting the center thickness of the cemented doublet lens, appropriately increasing the center thickness within a certain range is beneficial to enhancing the light control capability, allowing more light to enter the rear system, and improving relative illumination. Preferably, 0.06 ≤ (d10 + d11) / TTL ≤ 0.25.

[0155] In this embodiment, the minimum center thickness dn of the first to eighth lenses and the maximum center thickness dm of the first to eighth lenses satisfy the condition: dn / dm ≥ 0.06. Satisfying this condition ensures that the center thicknesses of the lenses from the third to the eighth lens are closer together, which helps to minimize the overall optical lens light refraction variation under high and low temperatures and improves temperature performance. Preferably, dn / dm ≥ 0.15.

[0156] 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 imaging plane of the optical lens, satisfies the following relationship with the total focal length F of the optical lens: TTL / F ≤ 15. A smaller ratio of the total optical length to the total focal length ensures a relatively smaller system. Preferably, TTL / F ≤ 12.

[0157] In this embodiment, 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 imaging plane, satisfies the following condition with respect to the overall focal length F of the optical lens: 1.89 ≤ BFL / F ≤ 7. Satisfying this condition ensures a long back focal length while achieving miniaturization, which is beneficial for module assembly. Preferably, 2.4 ≤ BFL / F ≤ 5.

[0158] In this embodiment, the rear focal length f(5-8) of the optical lens and 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 imaging plane of the optical lens, satisfy the following condition: |f(5-8)| / TTL≥0.06. By adjusting the ratio of the rear focal length to the total optical length, the larger the rear focal length, the longer the light path is, thereby achieving a long rear focal length. Preferably, |f(5-8)| / TTL≥0.1.

[0159] Example 2

[0160] like Figures 1 to 10 As shown, the optical lens, from the first side to the second side, includes, in sequence: a first lens with negative optical power; a second lens with negative optical power; a third lens with optical power; a fourth lens with positive optical power; a fifth lens with negative 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 front group focal length f(1-4) of the optical lens satisfies the following relationship with the total focal length F of the optical lens: 1.4 ≤ |f(1-4)| / F ≤ 23. By reasonably adjusting the front group focal length, the smaller the ratio of the front group focal length to the total focal length, the more beneficial it is for the front group light divergence, thus optimizing the large FOV system. It should be noted that the front group focal length f(1-4) refers to the combined focal length of the first to fourth lenses. Preferably, 1.9 ≤ |f(1-4)| / F ≤ 20.

[0161] In this embodiment, the first side of the first lens is convex, and the second side is concave. The first lens is an even-order aspherical lens with negative optical power, which adjusts the angle of light to optimize the divergence angle and correct system distortion by deflecting the light rays. The convex design of the first side of the first lens can reduce the interference of water droplets on image quality in rainy application scenarios. The concave design of the second side can collect as much light as possible from a large field of view into the rear optical system, allowing the diverging light rays to enter smoothly into the rear, and further making the light path transition smoothly.

[0162] In this embodiment, the first side of the second lens is convex, and the second side is concave. The second lens has negative optical power, which further diverges the light and adjusts the light refraction angle. When combined with the third lens with positive optical power, it corrects chromatic aberration. When the first side of the second lens is convex, the light deflection is smaller when it reaches the first imaging surface, making it more focused when it reaches the imaging surface. This defocusing corrects edge field aberrations, achieving high resolution, while minimizing light energy loss and reducing lens sensitivity.

[0163] In this embodiment, the first side surface of the second lens is concave, and the second side surface is concave. When the first side surface of the second lens is concave, the double-concave shape helps to reduce system sensitivity. The concave first side surface of the second lens causes a significant light reversal after light enters, making the edge rays and center rays of each field of view clearly distinguishable. This changes the trend of the edge rays, which is beneficial for aberration correction between the center and edge rays of each field of view, and helps to achieve high resolution.

[0164] In this embodiment, the third lens has positive optical power, with a concave first side and a convex second side. The positive optical power of the third lens converges light rays, adjusting the light angle to ensure a smooth transition of the light path to the rear, thus reducing system sensitivity. The concave-convex shape of the third lens also allows for a significantly smoother angle adjustment of the incident light, further improving system sensitivity and increasing production yield.

[0165] In this embodiment, the third lens has negative optical power, with a convex first side and a concave second side. The negative optical power of the third lens diverges the light rays, adjusting their angle and facilitating the entry of light rays into the optical system with a large field of view (FOV), thus optimizing the FOV system. The convex-concave shape of the third lens causes significant light deflection upon entry, further enhancing the entry of light rays into the optical system with a large FOV, altering the trend of edge light rays, and contributing to the optimization of the FOV system and the achievement of high resolution.

[0166] In this embodiment, the first side of the fourth lens is concave, and the second side is convex. The fourth lens is located near the aperture stop, and the concave first side of the fourth lens helps to collect more light, increasing the system's light transmission capability.

[0167] In this embodiment, the first side surface of the fourth lens is convex, and the second side surface is also convex. The fourth lens is close to the aperture stop, and its biconvex shape and similar curvature on both sides help to collect more light and increase the light transmission capability of the system.

[0168] In this embodiment, the first side surface of the fifth lens is concave, and the second side surface is also concave. The biconcave shape of the fifth lens, combined with the subsequent biconvex sixth lens of positive optical power, corrects chromatic aberration and reduces system sensitivity.

[0169] In this embodiment, the first side of the fifth lens is concave, and the second side is convex. The concave-convex shape of the fifth lens, when paired with the subsequent concave-convex sixth lens of positive optical power, corrects chromatic aberration and can reduce the system aperture.

[0170] In this embodiment, the first side surface of the sixth lens is convex, and the second side surface is also convex. The biconvex shape of the sixth lens, combined with the biconcave and negative power fifth lens, is beneficial for correcting chromatic aberration.

[0171] In this embodiment, the first side of the sixth lens is concave, and the second side is convex. The concave-convex shape of the sixth lens, combined with the concave-convex and negative power fifth lens, is beneficial for correcting chromatic aberration.

[0172] In this embodiment, the first side surface of the seventh lens is convex, and the second side surface is convex. The seventh lens has positive optical power, optimizes the telecentricity of the system and corrects system distortion, making the system an object-side telecentric system. The biconvex shape of the first and second side surfaces of the seventh lens helps to reduce the rear port diameter.

[0173] In this embodiment, the first side surface of the eighth lens is convex, and the second side surface is also convex. The combination of positive optical power optimizes the system's telecentricity, and the biconvex lens shape ensures a smooth transition of light rays to the rear, reducing system sensitivity. The convex second side surface is beneficial for structural design, preventing interference from edge structures during focusing.

[0174] In this embodiment, the first side of the eighth lens is convex, and the second side is concave. Combined with the telecentricity optimization system, the lens shape is adjusted to be biconvex, ensuring a smooth transition of light rays to the rear, reducing system sensitivity. The concave second side facilitates structural design and prevents scratches on the optical surface during placement.

[0175] 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 small projection ratio (large FOV angle), small telecentricity, long back focal length, high resolution, low sensitivity, and high mass production yield.

[0176] In this embodiment, the first lens is an aspherical lens. This configuration is beneficial for correcting field distortion and improving resolution.

[0177] In this embodiment, the fifth and sixth lenses are cemented together to form a cemented doublet lens. The use of a cemented doublet lens effectively eliminates the influence of ghosting on the optical lens and corrects chromatic aberration, ensuring high resolution while eliminating ghosting. The fifth lens has negative optical power, which, combined with the positive optical power of the subsequent sixth lens, corrects chromatic aberration. The negative fifth lens in the cemented doublet has a higher refractive index (relative to the positive sixth lens), allowing light to converge effectively and smoothly at the final point, ensuring a stable light path to the imaging plane, reducing overall weight and cost; reducing light loss caused by inter-lens reflections; and the combination of high and low refractive indices facilitates rapid transition of light from the front, increasing the aperture and light transmission, thus supporting high-efficiency projection requirements. Furthermore, the use of a cemented doublet reduces the air gap between the two lenses, making the overall optical system structure more compact and reducing tolerance sensitivity issues such as overall eccentricity of the lens units during assembly.

[0178] In this embodiment, the optical lens also includes an aperture stop, which is positioned between the fourth lens and the fifth lens. Placing the aperture stop in the middle position facilitates the effective focusing of light 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 assembly sensitivity of the system.

[0179] In this embodiment, the rear focal length f(5-8) of the optical lens and the total focal length F of the optical lens satisfy the following relationship: 0.9 ≤ |f(5-8)| / F ≤ 5.8. By reasonably adjusting the rear focal length, a larger ratio between the rear focal length and the total focal length is beneficial for a smoother transition of light, and adjusting the principal ray angle is beneficial for optimizing telecentricity. It should be noted here that the rear focal length f(5-8) refers to the combined focal length of the fifth to eighth lenses. Preferably, 1.3 ≤ |f(5-8)| / F ≤ 3.1.

[0180] In this embodiment, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy the condition: 0.59 ≤ |f1 / f2| ≤ 3.1. 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, 0.76 ≤ |f1 / f2| ≤ 2.2.

[0181] In this embodiment, the focal length f2 of the second lens and the focal length f3 of the third lens satisfy the condition: |f2 / f3|≤1.85. By reasonably adjusting the focal lengths of the positive and negative lenses, the smaller the ratio of the negative focal length of the second lens to the positive focal length of the third lens, the more beneficial it is to optimize the large FOV system. Preferably, |f2 / f3|≤1.

[0182] In this embodiment, the focal length f3 of the third lens and the total focal length F of the optical lens satisfy the condition: |f3 / F|≥2.55. By reasonably adjusting the ratio of the focal length of the third lens to the total focal length, a larger ratio is more conducive to the smooth emission of edge light in a large FOV system, thus improving resolution. Preferably, |f3 / F|≥3.25.

[0183] In this embodiment, the focal length f8 of the eighth lens and the total focal length F of the optical lens satisfy the following relationship: |f8 / F|≥2.89. By reasonably adjusting the ratio of the focal length of the eighth lens to the total focal length, a larger ratio is beneficial for a smoother transition of light, and adjusting the principal ray angle is beneficial for optimizing telecentricity. Preferably, |f8 / F|≥3.78.

[0184] In this embodiment, the sagitta SAG(S1) of the first side surface of the first lens and the sagitta SAG(S2) of the second side surface of the first lens satisfy the following condition: 0.21 ≤ SAG(S1) / SAG(S2) ≤ 0.81. By reasonably adjusting the curvature of the first lens, it is beneficial to collect a large amount of light while correcting edge field-of-view distortion, which is beneficial to the optimization of the large FOV system. Preferably, 0.4 ≤ SAG(S1) / SAG(S2) ≤ 0.74.

[0185] In this embodiment, the total focal length F of the optical lens and the exit pupil position EXPP of the total focal length F relative to the object plane are: |F / EXPP|≤0.5. If this condition is satisfied, the object plane is located on the second side, and the farther the exit pupil position is relative to the first image plane, the smaller the telecentricity. Preferably, |F / EXPP|≤0.35.

[0186] 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 imaging plane, satisfies the condition that BFL / TTL ≥ 0.25 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 of the optical lens to the center of the second side imaging plane. Satisfying this condition ensures a long back focal length while achieving miniaturization, which is beneficial for module assembly. Preferably, BFL / TTL ≥ 0.3.

[0187] 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 imaging plane, satisfies the condition that BFL / TL ≥ 0.3 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. Satisfying this condition ensures a long back focal length while achieving miniaturization, which is beneficial for module assembly; a short lens group length (TL) helps ensure a compact structure, reduces the lens's sensitivity to MTF, improves production yield, and reduces production costs. Preferably, BFL / TL ≥ 0.4.

[0188] In this embodiment, the focal length f7 of the seventh lens and the focal length f8 of the eighth lens satisfy the condition: 0.13 ≤ f7 / f8 ≤ 4.7. Satisfying this condition helps ensure that the focal lengths of adjacent lenses are similar, facilitates a smooth light transition, and improves image quality. Preferably, 0.26 ≤ f7 / f8 ≤ 2.5.

[0189] In this embodiment, the minimum absolute value fn among the focal length values ​​of the first lens to the eighth lens and the maximum absolute value fm among the focal length values ​​of the first lens to the eighth lens satisfy the condition: |fn| / |fm|≥0.05. Satisfying this condition helps to ensure that the difference in focal length between the lenses is smaller, and the even distribution of focal lengths helps to reduce the sensitivity of the lenses. Preferably, |fn| / |fm|≥0.08.

[0190] 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: 1 ≤ F / ENPD ≤ 5. Satisfying this condition helps to ensure a small FNO and increases the amount of light transmitted. Preferably, 1.5 ≤ F / ENPD ≤ 3.

[0191] In this embodiment, the focal length f1 of the first lens and the total focal length F of the optical lens satisfy the condition: 2.41 ≤ |f1 / F| ≤ 5.5. Satisfying this condition facilitates the rational allocation of the focal length of the first lens and allows light rays with a large field of view to enter the optical system, thereby achieving high resolution. Preferably, 2.67 ≤ |f1 / F| ≤ 4.3.

[0192] In this embodiment, the overall focal length F of the optical lens and the radius of curvature R22 of the second side surface of the second lens satisfy the following relationship: 0.16 ≤ |F / R22| ≤ 1.95. By reasonably setting the surface curvature of the second lens, incident light can be assisted in entering the optical system, and astigmatism can be effectively corrected to improve image quality. Preferably, 0.4 ≤ |F / R22| ≤ 1.56.

[0193] In this embodiment, the center thickness d10 of the fifth lens, the center thickness d11 of the sixth lens, and 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 imaging plane of the optical lens, satisfy the following condition: 0.03 ≤ (d10 + d11) / TTL ≤ 0.46. By reasonably setting the center thickness of the cemented doublet lens, appropriately increasing the center thickness within a certain range is beneficial to enhancing the light control capability, allowing more light to enter the rear system, and improving relative illumination. Preferably, 0.06 ≤ (d10 + d11) / TTL ≤ 0.25.

[0194] In this embodiment, the minimum center thickness dn of the first to eighth lenses and the maximum center thickness dm of the first to eighth lenses satisfy the condition: dn / dm ≥ 0.06. Satisfying this condition ensures that the center thicknesses of the lenses from the third to the eighth lens are closer together, which helps to minimize the overall optical lens light refraction variation under high and low temperatures and improves temperature performance. Preferably, dn / dm ≥ 0.15.

[0195] 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 imaging plane of the optical lens, satisfies the following relationship with the total focal length F of the optical lens: TTL / F ≤ 15. A smaller ratio of the total optical length to the total focal length ensures a relatively smaller system. Preferably, TTL / F ≤ 12.

[0196] In this embodiment, 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 imaging plane, satisfies the following condition with respect to the overall focal length F of the optical lens: 1.89 ≤ BFL / F ≤ 7. Satisfying this condition ensures a long back focal length while achieving miniaturization, which is beneficial for module assembly. Preferably, 2.4 ≤ BFL / F ≤ 5.

[0197] In this embodiment, the rear focal length f(5-8) of the optical lens and 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 imaging plane of the optical lens, satisfy the following condition: |f(5-8)| / TTL≥0.06. By adjusting the ratio of the rear focal length to the total optical length, the larger the rear focal length, the longer the light path is, thereby achieving a long rear focal length. Preferably, |f(5-8)| / TTL≥0.1.

[0198] 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.

[0199] 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.

[0200] 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 to 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 can prevent lens blurring caused by high and low temperature variations in the operating environment, thus avoiding impact on 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 where temperature stability requirements are lower, 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.

[0201] 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.

[0202] 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.

[0203] 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.

[0204] It should be noted that any of the examples one through ten below are applicable to all embodiments of this application.

[0205] Example 1

[0206] like Figure 1 The diagram shown is a schematic of the optical lens structure of Example 1.

[0207] like Figure 1 As shown, the optical lens includes, from the first side to the second side, the following components in sequence: first lens L1, second lens L2, third lens L3, fourth lens L4, aperture stop STO, fifth lens L5, sixth lens L6, seventh lens L7, eighth lens L8, first side surface of protective glass S17, second side surface of protective glass S18, and imaging surface IMA.

[0208] 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 concave, and its second side surface S6 is convex. The fourth lens L4 has positive optical power, its first side surface S7 is concave, and its second side surface S8 is convex. The fifth lens L5 has negative optical power, its first side surface S10 is concave, and its second side surface S11 is concave. 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 also convex. Light from the first side passes sequentially through surfaces S1 to S18 and is finally imaged onto the imaging plane IMA. Since the fifth lens L5 and the sixth lens L6 are cemented together to form a cemented doublet, the second side surface S11 of the fifth lens and the first side surface S11 of the sixth lens are the same surface.

[0209] In this example, the total effective focal length (F) of the optical lens is 7.908mm, the total length (TTL) of the optical lens is 74.999mm, and the optical back focal length (BFL) of the optical lens is 27.360mm.

[0210] 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).

[0211]

[0212] Table 1

[0213] In Example 1, the surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0214] Formula (1)

[0215] Where x is the distance vector from the vertex of the aspherical surface at a height h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; A, B, C, and D are all higher-order coefficients. Table 2 below shows the conic coefficient k and the higher-order coefficients A, B, C, and D that can be used for the aspherical lens surfaces S1 and S2 in Example 1.

[0216]

[0217] Table 2

[0218] Example 2

[0219] like Figure 2 The diagram shown is a schematic of the optical lens structure for Example 2. For the sake of brevity, descriptions similar to those in Example 1 will be omitted in this example and the following examples.

[0220] like Figure 2 As shown, the optical lens includes, from the first side to the second side, the following components in sequence: first lens L1, second lens L2, third lens L3, fourth lens L4, aperture stop STO, fifth lens L5, sixth lens L6, seventh lens L7, eighth lens L8, first side surface of protective glass S17, second side surface of protective glass S18, and imaging 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 concave, and its second side surface S6 is convex. The fourth lens L4 has positive optical power, its first side surface S7 is concave, and its second side surface S8 is convex. The fifth lens L5 has negative optical power, its first side surface S10 is concave, and its second side surface S11 is concave. 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 also convex. Light from the first side passes sequentially through surfaces S1 to S18 and is finally imaged onto the imaging plane IMA. Since the fifth lens L5 and the sixth lens L6 are cemented together to form a cemented doublet, the second side surface S11 of the fifth lens and the first side surface S11 of the sixth lens are the same surface.

[0222] In this example, the total effective focal length F of the optical lens is 7.907mm, the total length TTL of the optical lens is 75.000mm, and the optical back focal length BFL of the optical lens is 27.360mm.

[0223] Table 3 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).

[0224]

[0225] Table 3

[0226] Table 4 below shows the conic coefficient k and the coefficients A, B, C, and D of each higher-order term that can be used for the aspherical lens surfaces S1 and S2 in Example 2.

[0227]

[0228] Table 4

[0229] Example 3

[0230] like Figure 3 The diagram shown is a schematic of the optical lens structure in Example 3.

[0231] like Figure 3As shown, the optical lens includes, from the first side to the second side, the following components in sequence: first lens L1, second lens L2, third lens L3, fourth lens L4, aperture stop STO, fifth lens L5, sixth lens L6, seventh lens L7, eighth lens L8, first side surface of protective glass S17, second side surface of protective glass S18, and imaging surface IMA.

[0232] 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 concave, and its second side surface S6 is convex. The fourth lens L4 has positive optical power, its first side surface S7 is convex, and its second side surface S8 is convex. The fifth lens L5 has negative optical power, its first side surface S10 is concave, and its second side surface S11 is concave. 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 also convex. Light from the first side passes sequentially through surfaces S1 to S18 and is finally imaged onto the imaging plane IMA. Since the fifth lens L5 and the sixth lens L6 are cemented together to form a cemented doublet, the second side surface S11 of the fifth lens and the first side surface S11 of the sixth lens are the same surface.

[0233] In this example, the total effective focal length F of the optical lens is 7.880mm, the total length TTL of the optical lens is 75.000mm, and the optical back focal length BFL of the optical lens is 27.360mm.

[0234] Table 5 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).

[0235]

[0236] Table 5

[0237] Table 6 below shows the conic coefficient k and the coefficients A, B, C, and D of each higher-order term that can be used for the aspherical lens surfaces S1 and S2 in Example 3.

[0238]

[0239] Table 6

[0240] Example 4

[0241] like Figure 4 The diagram shown is a schematic of the optical lens structure of Example 4.

[0242] like Figure 4 As shown, the optical lens includes, from the first side to the second side, the following components in sequence: first lens L1, second lens L2, third lens L3, fourth lens L4, aperture stop STO, fifth lens L5, sixth lens L6, seventh lens L7, eighth lens L8, first side surface of protective glass S17, second side surface of protective glass S18, and imaging surface IMA.

[0243] 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 concave, and its second side surface S6 is convex. The fourth lens L4 has positive optical power, its first side surface S7 is convex, and its second side surface S8 is convex. The fifth lens L5 has negative optical power, its first side surface S10 is concave, and its second side surface S11 is concave. 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 also convex. Light from the first side passes sequentially through surfaces S1 to S18 and is finally imaged onto the imaging plane IMA. Since the fifth lens L5 and the sixth lens L6 are cemented together to form a cemented doublet, the second side surface S11 of the fifth lens and the first side surface S11 of the sixth lens are the same surface.

[0244] In this example, the total effective focal length F of the optical lens is 7.880mm, the total length TTL of the optical lens is 75.000mm, and the optical back focal length BFL of the optical lens is 27.360mm.

[0245] Table 7 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).

[0246]

[0247] Table 7

[0248] Table 8 below shows the conic coefficient k and the coefficients A, B, C, and D of each higher-order term that can be used for the aspherical lens surfaces S1 and S2 in Example 4.

[0249]

[0250] Table 8

[0251] Example 5

[0252] like Figure 5 The diagram shown is a schematic of the optical lens structure of Example 5.

[0253] like Figure 5 As shown, the optical lens includes, from the first side to the second side, the following components in sequence: first lens L1, second lens L2, third lens L3, fourth lens L4, aperture stop STO, fifth lens L5, sixth lens L6, seventh lens L7, eighth lens L8, first side surface of protective glass S17, second side surface of protective glass S18, and imaging surface IMA.

[0254] 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 concave, and its second side surface S6 is convex. The fourth lens L4 has positive optical power, its first side surface S7 is convex, and its second side surface S8 is convex. The fifth lens L5 has negative optical power, its first side surface S10 is concave, and its second side surface S11 is concave. 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 also convex. Light from the first side passes sequentially through surfaces S1 to S18 and is finally imaged onto the imaging plane IMA. Since the fifth lens L5 and the sixth lens L6 are cemented together to form a cemented doublet, the second side surface S11 of the fifth lens and the first side surface S11 of the sixth lens are the same surface.

[0255] In this example, the total effective focal length F of the optical lens is 7.632mm, the total length TTL of the optical lens is 74.391mm, and the optical back focal length BFL of the optical lens is 27.360mm.

[0256] Table 9 shows the basic structural parameters of the optical lens in Example 5, where the units for radius of curvature (Radius) and thickness (Thickness / Distance) are millimeters (mm).

[0257]

[0258] Table 9

[0259] Table 10 below shows the conic coefficient k and the coefficients A, B, C, and D of each higher-order term that can be used for the aspherical lens surfaces S1 and S2 in Example 5.

[0260]

[0261] Table 10

[0262] Example 6

[0263] like Figure 6 The diagram shown is a schematic of the optical lens structure of Example 6.

[0264] like Figure 6 As shown, the optical lens includes, from the first side to the second side, the following components in sequence: first lens L1, second lens L2, third lens L3, fourth lens L4, aperture stop STO, fifth lens L5, sixth lens L6, seventh lens L7, eighth lens L8, first side surface of protective glass S17, second side surface of protective glass S18, and imaging surface IMA.

[0265] 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 concave, and its second side surface S6 is convex. The fourth lens L4 has positive optical power, its first side surface S7 is convex, and its second side surface S8 is convex. The fifth lens L5 has negative optical power, its first side surface S10 is concave, and its second side surface S11 is concave. 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 also convex. Light from the first side passes sequentially through surfaces S1 to S18 and is finally imaged onto the imaging plane IMA. Since the fifth lens L5 and the sixth lens L6 are cemented together to form a cemented doublet, the second side surface S11 of the fifth lens and the first side surface S11 of the sixth lens are the same surface.

[0266] In this example, the total effective focal length (F) of the optical lens is 7.835mm, the total length (TTL) of the optical lens is 75.000mm, and the optical back focal length (BFL) of the optical lens is 27.360mm.

[0267] Table 11 shows the basic structural parameters of the optical lens of Example 6, where the units for radius of curvature (Radius) and thickness (Thickness / Distance) are millimeters (mm).

[0268]

[0269] Table 11

[0270] Table 12 below shows the conic coefficient k and the coefficients A, B, C, D, E, F, and G of each higher-order term that can be used for the aspherical lens surfaces S1 and S2 in Example Six.

[0271]

[0272] Table 12

[0273] Example 7

[0274] like Figure 7 The diagram shown is a schematic of the optical lens structure of Example 7.

[0275] like Figure 7 As shown, the optical lens includes, from the first side to the second side, the following components in sequence: first lens L1, second lens L2, third lens L3, fourth lens L4, aperture stop STO, fifth lens L5, sixth lens L6, seventh lens L7, eighth lens L8, first side surface of protective glass S17, second side surface of protective glass S18, and imaging surface IMA.

[0276] 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 concave, and its second side surface S6 is convex. The fourth lens L4 has positive optical power, its first side surface S7 is concave, and its second side surface S8 is convex. The fifth lens L5 has negative optical power, its first side surface S10 is concave, and its second side surface S11 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. Light from the first side passes sequentially through surfaces S1 to S18 and is finally imaged onto the imaging plane IMA. Since the fifth lens L5 and the sixth lens L6 are cemented together to form a cemented doublet, the second side surface S11 of the fifth lens and the first side surface S11 of the sixth lens are the same surface.

[0277] In this example, the total effective focal length (F) of the optical lens is 8.047 mm, the total length (TTL) of the optical lens is 75.000 mm, and the optical back focal length (BFL) of the optical lens is 27.359 mm.

[0278] Table 13 shows the basic structural parameters of the optical lens of Example 7, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0279]

[0280] Table 13

[0281] Table 14 below shows the conic coefficient k and the coefficients A, B, C, D, E, F, and G of each higher-order term that can be used for the aspherical lens surfaces S1 and S2 in Example 7.

[0282]

[0283] Table 14

[0284] Example 8

[0285] like Figure 8 The diagram shown is a schematic of the optical lens structure of Example 8.

[0286] like Figure 8As shown, the optical lens includes, from the first side to the second side, the following components in sequence: first lens L1, second lens L2, third lens L3, fourth lens L4, aperture stop STO, fifth lens L5, sixth lens L6, seventh lens L7, eighth lens L8, first side surface of protective glass S17, second side surface of protective glass S18, and imaging surface IMA.

[0287] 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 concave, and its second side surface S6 is convex. The fourth lens L4 has positive optical power, its first side surface S7 is concave, and its second side surface S8 is convex. The fifth lens L5 has negative optical power, its first side surface S10 is concave, and its second side surface S11 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. Light from the first side passes sequentially through surfaces S1 to S18 and is finally imaged onto the imaging plane IMA. Since the fifth lens L5 and the sixth lens L6 are cemented together to form a cemented doublet, the second side surface S11 of the fifth lens and the first side surface S11 of the sixth lens are the same surface.

[0288] In this example, the total effective focal length (F) of the optical lens is 8.047 mm, the total length (TTL) of the optical lens is 75.000 mm, and the optical back focal length (BFL) of the optical lens is 27.359 mm.

[0289] Table 15 shows the basic structural parameters of the optical lens of Example 8, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0290]

[0291] Table 15

[0292] Table 16 below shows the conic coefficient k and the coefficients A, B, C, D, E, F, and G of each higher-order term that can be used for the aspherical lens surfaces S1 and S2 in Example 8.

[0293]

[0294] Table 16

[0295] Example 9

[0296] like Figure 9 The diagram shown is a schematic of the optical lens structure of Example 9.

[0297] like Figure 9 As shown, the optical lens includes, from the first side to the second side, the following components in sequence: first lens L1, second lens L2, third lens L3, fourth lens L4, aperture stop STO, fifth lens L5, sixth lens L6, seventh lens L7, eighth lens L8, first side surface of protective glass S17, second side surface of protective glass S18, and imaging surface IMA.

[0298] 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 negative optical power, its first side surface S5 is convex, and its second side surface S6 is concave. The fourth lens L4 has positive optical power, its first side surface S7 is convex, and its second side surface S8 is convex. The fifth lens L5 has negative optical power, its first side surface S10 is concave, and its second side surface S11 is concave. 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. Its first side surface S15 is convex, and its second side surface S16 is concave. Light from the first side passes sequentially through surfaces S1 to S18 and is finally imaged onto the imaging plane IMA. Since the fifth lens L5 and the sixth lens L6 are cemented together to form a cemented doublet, the second side surface S11 of the fifth lens and the first side surface S11 of the sixth lens are the same surface.

[0299] In this example, the total effective focal length (F) of the optical lens is 8.165mm, the total length (TTL) of the optical lens is 78.687mm, and the optical back focal length (BFL) of the optical lens is 27.360mm.

[0300] Table 17 shows the basic structural parameters of the optical lens of Example 9, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0301]

[0302] Table 17

[0303] Table 18 below shows the conic coefficient k and the coefficients A, B, C, D, E, F, and G of each higher-order term that can be used for the aspherical lens surfaces S1 and S2 in Example 9.

[0304]

[0305] Table 18

[0306] Example 10

[0307] like Figure 10 The diagram shown is a schematic of the optical lens structure of Example 10.

[0308] like Figure 10 As shown, the optical lens includes, from the first side to the second side, the following components in sequence: first lens L1, second lens L2, third lens L3, fourth lens L4, aperture stop STO, fifth lens L5, sixth lens L6, seventh lens L7, eighth lens L8, first side surface of protective glass S17, second side surface of protective glass S18, and imaging surface IMA.

[0309] 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 negative optical power, its first side surface S5 is convex, and its second side surface S6 is concave. The fourth lens L4 has positive optical power, its first side surface S7 is convex, and its second side surface S8 is convex. The fifth lens L5 has negative optical power, its first side surface S10 is concave, and its second side surface S11 is concave. 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. Its first side surface S15 is convex, and its second side surface S16 is concave. Light from the first side passes sequentially through surfaces S1 to S18 and is finally imaged onto the imaging plane IMA. Since the fifth lens L5 and the sixth lens L6 are cemented together to form a cemented doublet, the second side surface S11 of the fifth lens and the first side surface S11 of the sixth lens are the same surface.

[0310] In this example, the total effective focal length (F) of the optical lens is 8.240mm, the total length (TTL) of the optical lens is 77.779mm, and the optical back focal length (BFL) of the optical lens is 27.360mm.

[0311] Table 19 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).

[0312]

[0313] Table 19

[0314] Table 20 below shows the conic coefficient k and the coefficients A, B, C, D, E, F, and G of each higher-order term that can be used for the aspherical lens surfaces S1 and S2 in Example 10.

[0315]

[0316] Table 20

[0317] In summary, Examples 1 through 2 completely satisfy the relationships shown in Table 21.

[0318]

[0319] Table 21

[0320] Table 22 gives the effective focal length F of the optical lenses in Examples 1 to 10, and the effective focal lengths f1 to f8 of each lens, etc. (unit: mm).

[0321]

[0322] Table 22

[0323] 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.

[0324] 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.

[0325] 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.

[0326] 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 has a total of eight lenses, which are sequentially arranged from the first side to the second side as follows: A first lens with negative optical power, wherein the first side surface of the first lens is convex and the second side surface is concave; A second lens with negative optical power, wherein the second side surface of the second lens is concave. A third lens with optical power; A fourth lens with positive optical power, wherein the second side surface of the fourth lens is convex; A fifth lens with negative optical power, wherein the first side surface of the fifth lens is concave; 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 focal length f1 of the first lens and the total focal length F of the optical lens satisfy the following condition: 2.41 ≤ |f1 / F| ≤ 5.5; The rear focal length f(5-8) of the optical lens and the total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens of the optical lens to the center of the second side imaging plane of the optical lens, satisfy the following condition: 0.297≥|f(5-8)| / TTL≥0.

06.

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

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

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

5. The optical lens according to claim 1, characterized in that, The third lens has negative optical power, and the first side of the third lens is convex and the second side is concave.

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

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

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

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

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

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

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

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

14. The optical lens according to claim 1, characterized in that, The first lens is an aspherical lens.

15. The optical lens according to claim 1, characterized in that, The fifth lens and the sixth lens are cemented together to form a cemented doublet lens.

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

17. The optical lens according to any one of claims 1 to 16, characterized in that, The front focal length f(1-4) of the optical lens and the total focal length F of the optical lens satisfy the following condition: 1.4≤|f(1-4)| / F≤23.

18. The optical lens according to any one of claims 1 to 16, characterized in that, The rear focal length f(5-8) of the optical lens satisfies the following relationship with the total focal length F of the optical lens: 0.9≤|f(5-8)| / F≤5.

8.

19. The optical lens according to any one of claims 1 to 16, characterized in that, The focal length f1 of the first lens and the focal length f2 of the second lens satisfy the following condition: 0.59 ≤ |f1 / f2| ≤ 3.

1.

20. The optical lens according to any one of claims 1 to 16, characterized in that, The focal length f2 of the second lens and the focal length f3 of the third lens satisfy the following condition: 0.180≤|f2 / f3|≤1.

85.

21. The optical lens according to any one of claims 1 to 16, characterized in that, The focal length f3 of the third lens and the total focal length F of the optical lens satisfy the following condition: 19.981 ≥ |f3 / F| ≥ 2.

55.

22. The optical lens according to any one of claims 1 to 16, characterized in that, The focal length f8 of the eighth lens satisfies the following relationship with the total focal length F of the optical lens: 7.342 ≥ |f8 / F| ≥ 2.

89.

23. The optical lens according to any one of claims 1 to 16, characterized in that, The sagitta SAG(S1) of the first side surface of the first lens and the sagitta SAG(S2) of the second side surface of the first lens satisfy the following condition: 0.21≤SAG(S1) / SAG(S2)≤0.

81.

24. The optical lens according to any one of claims 1 to 16, characterized in that, The total focal length F of the optical lens and the exit pupil position EXPP of the total focal length F of the optical lens relative to the object plane are: 0.082≤|F / EXPP|≤0.

5.

25. The optical lens according to any one of claims 1 to 16, characterized in that, The optical back focal length of the optical lens, i.e., the center distance BFL from the center of the second side of the last lens of the optical lens to the center of the second side imaging plane, satisfies the following condition with respect to the total optical length of the optical lens, i.e., the center distance TTL from the center of the first side of the first lens of the optical lens to the center of the second side imaging plane: 0.368 ≥ BFL / TTL ≥ 0.

25.

26. The optical lens according to any one of claims 1 to 16, 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 imaging plane, 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 of the optical lens to the center of the second side of the last lens of the optical lens: 0.582≥BFL / TL≥0.

3.

27. The optical lens according to any one of claims 1 to 16, characterized in that, The focal length f7 of the seventh lens and the focal length f8 of the eighth lens satisfy the following condition: 0.13≤f7 / f8≤4.

7.

28. The optical lens according to any one of claims 1 to 16, characterized in that, The minimum absolute value fn between the focal length values ​​of the first lens and the eighth lens and the maximum absolute value fm between the focal length values ​​of the first lens and the eighth lens satisfy the following condition: 0.337≥|fn| / |fm|≥0.

05.

29. The optical lens according to any one of claims 1 to 16, 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 relationship: 1≤F / ENPD≤5.

30. The optical lens according to any one of claims 1 to 16, characterized in that, The total focal length F of the optical lens and the radius of curvature R22 of the second side surface of the second lens satisfy the following condition: 0.16≤|F / R22|≤1.

95.

31. The optical lens according to any one of claims 1 to 16, characterized in that, The center thickness d10 of the fifth lens, the center thickness d11 of the sixth lens, and 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 imaging plane of the optical lens, satisfy the following condition: 0.03≤(d10+d11) / TTL≤0.

46.

32. The optical lens according to any one of claims 1 to 16, characterized in that, The minimum center thickness dn of the first lens to the eighth lens and the maximum center thickness dm of the first lens to the eighth lens satisfy the following condition: 0.408 ≥ dn / dm ≥ 0.

06.

33. The optical lens according to any one of claims 1 to 16, 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 of the optical lens to the center of the imaging plane of the second side of the optical lens, satisfies the following condition with respect to the total focal length F of the optical lens: 9.320≤TTL / F≤15.

34. The optical lens according to any one of claims 1 to 16, 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 imaging plane, satisfies the following condition with respect to the total focal length F of the optical lens: 1.89≤BFL / F≤7.

35. The optical lens according to any one of claims 1 to 16, characterized in that, The front group focal length f(1-4) of the optical lens and the total focal length F of the optical lens satisfy the following condition: 1.9≤|f(1-4)| / F≤20; The rear focal length f(5-8) of the optical lens and the total focal length F of the optical lens satisfy the following condition: 1.3≤|f(5-8)| / F≤3.1; The focal length f1 of the first lens and the focal length f2 of the second lens satisfy the following condition: 0.76 ≤ |f1 / f2| ≤ 2.2; The focal length f2 of the second lens and the focal length f3 of the third lens satisfy the following condition: 0.180 ≤ |f2 / f3| ≤ 1; The focal length f3 of the third lens and the total focal length F of the optical lens satisfy the following condition: 19.981 ≥ |f3 / F| ≥ 3.25; The focal length f8 of the eighth lens and the total focal length F of the optical lens satisfy the following condition: 7.342 ≥ |f8 / F| ≥ 3.78; The sag of the first side surface of the first lens, SAG(S1), and the sag of the second side surface of the first lens, SAG(S2), satisfy the following condition: 0.4 ≤ SAG(S1) / SAG(S2) ≤ 0.

74. The total focal length F of the optical lens and the exit pupil position EXPP of the total focal length F of the optical lens relative to the object plane are: 0.082≤|F / EXPP|≤0.35; 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 imaging plane, satisfies the following condition with respect to the total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens of the optical lens to the center of the second side imaging plane: 0.368 ≥ 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 imaging plane, 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 of the optical lens to the center of the second side of the last lens of the optical lens, satisfy the following condition: 0.582≥BFL / TL≥0.

4. The focal length f7 of the seventh lens and the focal length f8 of the eighth lens satisfy the following condition: 0.26 ≤ f7 / f8 ≤ 2.5; The minimum absolute value fn between the focal length values ​​of the first lens and the eighth lens and the maximum absolute value fm between the focal length values ​​of the first lens and the eighth lens satisfy the following condition: 0.337 ≥ |fn| / |fm| ≥ 0.08; The total focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy the following relationship: 1.5≤F / ENPD≤3; The focal length f1 of the first lens and the total focal length F of the optical lens satisfy the following condition: 2.67 ≤ |f1 / F| ≤ 4.3; The total focal length F of the optical lens and the radius of curvature R22 of the second side surface of the second lens satisfy the following relationship: 0.4≤|F / R22|≤1.56; The center thickness d10 of the fifth lens, the center thickness d11 of the sixth lens, and the total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens of the optical lens to the center of the second side imaging plane of the optical lens, satisfy the following condition: 0.06≤(d10+d11) / TTL≤0.25; The minimum center thickness dn from the first lens to the eighth lens and the maximum center thickness dm from the first lens to the eighth lens satisfy the following condition: 0.408 ≥ dn / dm ≥ 0.15; The total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging plane of the second side of the optical lens, satisfies the following condition with respect to the total focal length F of the optical lens: 9.320≤TTL / F≤12. 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 imaging plane, satisfies the following condition with respect to the total focal length F of the optical lens: 2.4≤BFL / F≤5. The rear focal length f(5-8) of the optical lens and the total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens of the optical lens to the center of the second side imaging plane of the optical lens, satisfy the following condition: 0.297≥|f(5-8)| / TTL≥0.

1.

36. The optical lens according to any one of claims 1 to 16, characterized in that, The front group focal length f(1-4) of the optical lens and the total focal length F of the optical lens satisfy the following condition: 2.238≤|f(1-4)| / F≤17.666; The rear focal length f(5-8) of the optical lens and the total focal length F of the optical lens satisfy the following condition: 1.966≤|f(5-8)| / F≤2.771; The focal length f1 of the first lens and the focal length f2 of the second lens satisfy the following condition: 0.918 ≤ |f1 / f2| ≤ 1.317; The focal length f2 of the second lens and the focal length f3 of the third lens satisfy the following condition: 0.180 ≤ |f2 / f3| ≤ 0.584; The focal length f3 of the third lens and the total focal length F of the optical lens satisfy the following condition: 19.981 ≥ |f3 / F| ≥ 3.937; The focal length f8 of the eighth lens and the total focal length F of the optical lens satisfy the following condition: 7.342 ≥ |f8 / F| ≥ 5.015; The sag of the first side surface of the first lens, SAG(S1), and the sag of the second side surface of the first lens, SAG(S2), satisfy the following condition: 0.544≤SAG(S1) / SAG(S2)≤0.708; The total focal length F of the optical lens and the exit pupil position EXPP of the total focal length F of the optical lens relative to the object plane are: 0.082≤|F / EXPP|≤0.194; The optical back focal length of the optical lens, i.e., the center distance BFL from the center of the second side of the last lens of the optical lens to the center of the second side imaging plane, and the optical total length of the optical lens, i.e., the center distance TTL from the center of the first side of the first lens of the optical lens to the center of the second side imaging plane of the optical lens, satisfy the following condition: 0.368≥BFL / TTL≥0.

348. 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 imaging plane, 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 of the optical lens to the center of the second side of the last lens of the optical lens, satisfy the following condition: 0.582≥BFL / TL≥0.

533. The focal length f7 of the seventh lens and the focal length f8 of the eighth lens satisfy the following condition: 0.440 ≤ f7 / f8 ≤ 1.095; The minimum absolute value fn between the focal length values ​​of the first lens and the eighth lens and the maximum absolute value fm between the focal length values ​​of the first lens and the eighth lens satisfy the following condition: 0.337 ≥ |fn| / |fm| ≥ 0.120; The total focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy the following relationship: 2.534≤F / ENPD≤2.572; The focal length f1 of the first lens and the total focal length F of the optical lens satisfy the following condition: 2.867 ≤ |f1 / F| ≤ 3.305; The total focal length F of the optical lens and the radius of curvature R22 of the second side surface of the second lens satisfy the following relationship: 0.768≤|F / R22|≤1.177; The center thickness d10 of the fifth lens, the center thickness d11 of the sixth lens, and the total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens of the optical lens to the center of the second side imaging plane of the optical lens, satisfy the following condition: 0.086≤(d10+d11) / TTL≤0.115; The minimum center thickness dn from the first lens to the eighth lens and the maximum center thickness dm from the first lens to the eighth lens satisfy the following condition: 0.408 ≥ dn / dm ≥ 0.195; The total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging plane of the second side of the optical lens, satisfies the following condition with respect to the total focal length F of the optical lens: 9.320≤TTL / F≤9.

747. 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 imaging plane, satisfies the following condition with respect to the total focal length F of the optical lens: 3.321≤BFL / F≤3.585; The rear focal length f(5-8) of the optical lens and the total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens of the optical lens to the center of the second side imaging plane of the optical lens, satisfy the following: 0.297≥|f(5-8)| / TTL≥0.

206.

37. An electronic device, characterized in that, It includes an optical lens according to any one of claims 1 to 36 and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

Images