Optical lens and electronic device

Abstract

This invention provides an optical lens and an electronic device. The optical lens, from a first side to a second side, sequentially includes: a first lens with positive optical power, wherein a first side surface of the first lens is convex and a second side surface is concave; a second lens with negative optical power, wherein a first side surface of the second lens is convex and a second side surface is concave; a third lens with negative optical power; a fourth lens with positive optical power, wherein a second side surface of the fourth lens is convex; a fifth lens with positive optical power, wherein a second side surface of the fifth lens is convex; and a sixth lens with positive optical power, wherein a first side surface of the sixth lens is convex. This invention solves the problem that existing optical lenses often suffer from difficulties in simultaneously achieving small distortion, small telecentricity, weak ghosting, high luminous flux, small aperture, and miniaturization.

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. For example, in the automotive industry, for driving safety, more accurate detection of the driving environment is required, and optical lenses have become key components for detecting information around the car. At the same time, with the rapid development of autonomous driving assistance systems, the number of optical lenses used in automobiles is gradually increasing.

[0003] With the widespread adoption of HUDs in automotive safety, they can display instrument, navigation, and safety information on the windshield, allowing drivers to access relevant information without looking down. Optical lenses are used as imaging units in HUD optical systems. However, as HUD applications expand, simple projection lenses are insufficient to meet the demands of HUD usage. While existing technologies offer some optical lenses, they suffer from several insurmountable problems, such as high distortion, inability to simultaneously achieve a large field of view (FOV) and low distortion, inability to simultaneously meet the requirements of small telecentricity, small aperture, and miniaturization, or inability to simultaneously meet the requirements of high light transmittance and low ghosting.

[0004] In other words, existing optical lenses suffer from the problem of not being able to simultaneously achieve small distortion, small telecentricity, weak ghosting, high light throughput, small aperture, and miniaturization. Summary of the Invention

[0005] The main objective of this invention is to provide an optical lens and an electronic device to solve the problem that existing optical lenses cannot simultaneously achieve small distortion, small telecentricity, weak ghosting, high light throughput, small aperture, and miniaturization.

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

[0007] Furthermore, the first side of the third lens is concave, and the second side is convex.

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

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

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

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

[0012] Furthermore, the first side surface of the fifth lens is concave.

[0013] Furthermore, the first side surface of the fifth lens is convex.

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

[0015] Furthermore, the second side surface of the sixth lens is concave.

[0016] Furthermore, the third lens and the fourth lens are cemented together to form a cemented doublet lens.

[0017] Furthermore, the optical lens also includes an aperture stop, which is positioned between the second lens and the third lens.

[0018] 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 imaging plane of the optical lens, satisfies the following condition with respect to the total focal length F of the optical lens: 1.86≤TTL / F≤6.8.

[0019] Furthermore, the maximum aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy the following condition: 0.02≤D / H / FOV≤0.09.

[0020] Furthermore, the overall focal length F of the optical lens, the entrance pupil diameter ENPD of the optical lens, and the maximum effective aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens satisfy the following condition: 0.055≤F / ENPD / D≤0.21.

[0021] Furthermore, the image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian value θ of the maximum field of view of the optical lens satisfy the following condition: 0.005≤|(HF*θ) / (F*θ)|≤0.095.

[0022] 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 imaging plane, satisfies the following condition with respect to the optical total length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging plane of the optical lens: 0.08≤BFL / TTL≤0.98.

[0023] 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 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 to the center of the second side of the last lens: 0.18≤BFL / TL≤4.1.

[0024] Furthermore, the total focal length F of the optical lens and the image height H corresponding to the maximum field of view of the optical lens satisfy the following condition: 0.75≤F / H≤5.3.

[0025] Furthermore, the image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian value θ of the maximum field of view of the optical lens satisfy the following: 0.001≤(H / 2) / (F*tan(θ / 2))≤3.2.

[0026] Furthermore, the combined focal length F of the third, fourth, fifth, and sixth lenses... (3-6) The radius of curvature R1 of the first side surface of the first lens and the radius of curvature R2 of the second side surface of the first lens satisfy the following condition: 0.005 ≤ |F (3-6) / (R1+R2)|≤0.53.

[0027] Furthermore, the radius of curvature R3 of the first side surface of the second lens, the radius of curvature R6 of the first side surface of the third lens, the distance d4 between the second side surface of the second lens and the aperture stop, and the distance d5 between the first side surface of the third lens and the aperture stop satisfy the following condition: 0.001≤(d4+d5) / (R3+|R6|)≤0.76.

[0028] Furthermore, the distance d from the aperture to the chip (5-14) 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 image plane, satisfies: 1.08 ≤ d (5-14) / (d (5-14) -BFL)≤7.3.

[0029] Furthermore, the distance d4 between the second side surface of the second lens and the aperture stop and the distance d5 between the first side surface of the third lens and the aperture stop satisfy the following condition: 3.3 ≤ d4 + d5 ≤ 15.4.

[0030] Furthermore, the aperture D11 of the first side of the sixth lens, the distance L from the aperture stop to the imaging plane, and the optical back focal length of the optical lens, i.e., the distance BFL from the center of the second side of the last lens of the optical lens to the center of the imaging plane, satisfy the following condition: 6.4≤D11*BFL / L≤16.2.

[0031] Furthermore, the total focal length F of the optical lens and the exit pupil position EXPP of the optical lens satisfy the following condition: 0.095≤|F / EXPP|≤0.9.

[0032] Furthermore, the radius of curvature R3 of the first side surface of the second lens and the radius of curvature R4 of the second side surface of the second lens satisfy the following condition: 0.272≤(R3-R4) / (R3+R4)≤0.76.

[0033] Furthermore, the refractive index Nd2 of the second lens, the radius of curvature R3 of the first side surface of the second lens, the radius of curvature R4 of the second side surface of the second lens, and the thickness d3 of the second lens satisfy the following relationship: -0.088≤(Nd2-1)*(1 / R3-1 / R4)+(Nd2-1)2*d3 / (Nd2*R3*R4)≤-0.01.

[0034] Furthermore, the sag3 of the first side surface of the second lens and the sag4 of the image side surface of the second lens satisfy the following condition: 0.03≤|sag3 / sag4|≤5.1.

[0035] Furthermore, the overall focal length F of the optical lens, the radius of curvature R1 of the first side surface of the first lens, and the radius of curvature R2 of the second side surface of the first lens satisfy the following condition: 0.05≤|F / R1|+|F / R2|≤3.5.

[0036] 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 positive optical power; a second lens having negative optical power; a third lens having negative optical power; a fourth lens having positive optical power; a fifth lens having positive optical power; and a sixth lens having positive optical power; wherein the total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the imaging plane of the optical lens, satisfies the following condition with respect to the total focal length F of the optical lens: 1.86 ≤ TTL / F ≤ 6.8.

[0037] Furthermore, the first side surface of the first lens is convex, and the second side surface is concave.

[0038] Furthermore, the first side surface of the second lens is convex, and the second side surface is concave.

[0039] Furthermore, the first side of the third lens is concave, and the second side is convex.

[0040] Furthermore, the first side surface of the third lens is concave, and the second side surface is concave.

[0041] Furthermore, the first side of the third lens is convex, and the second side is concave.

[0042] Furthermore, the first side surface of the fourth lens is convex, and the second side surface is convex.

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

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

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

[0046] Furthermore, the first side surface of the sixth lens is convex, and the second side surface is convex.

[0047] Furthermore, the first side of the sixth lens is convex, and the second side is concave.

[0048] Furthermore, the third lens and the fourth lens are cemented together to form a cemented doublet lens.

[0049] Furthermore, the optical lens also includes an aperture stop, which is positioned between the second lens and the third lens.

[0050] Furthermore, the refractive index Nd2 of the second lens, the radius of curvature R3 of the first side surface of the second lens, the radius of curvature R4 of the second side surface of the second lens, and the thickness d3 of the second lens satisfy the following relationship: -0.088≤(Nd2-1)*(1 / R3-1 / R4)+(Nd2-1)2*d3 / (Nd2*R3*R4)≤-0.01.

[0051] Furthermore, the maximum aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy the following condition: 0.02≤D / H / FOV≤0.09.

[0052] Furthermore, the overall focal length F of the optical lens, the entrance pupil diameter ENPD of the optical lens, and the maximum effective aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens satisfy the following condition: 0.055≤F / ENPD / D≤0.21.

[0053] Furthermore, the image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian value θ of the maximum field of view of the optical lens satisfy the following condition: 0.005≤|(HF*θ) / (F*θ)|≤0.095.

[0054] 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 imaging plane, satisfies the following condition with respect to the optical total length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging plane of the optical lens: 0.08≤BFL / TTL≤0.98.

[0055] 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 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 to the center of the second side of the last lens: 0.18≤BFL / TL≤4.1.

[0056] Furthermore, the total focal length F of the optical lens and the image height H corresponding to the maximum field of view of the optical lens satisfy the following condition: 0.75≤F / H≤5.3.

[0057] Furthermore, the image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian value θ of the maximum field of view of the optical lens satisfy the following: 0.001≤(H / 2) / (F*tan(θ / 2))≤3.2.

[0058] Furthermore, the combined focal length F of the third, fourth, fifth, and sixth lenses... (3-6) The radius of curvature R1 of the first side surface of the first lens and the radius of curvature R2 of the second side surface of the first lens satisfy the following condition: 0.005 ≤ |F (3-6) / (R1+R2)|≤0.53.

[0059] Furthermore, the radius of curvature R3 of the first side surface of the second lens, the radius of curvature R6 of the first side surface of the third lens, the distance d4 between the second side surface of the second lens and the aperture stop, and the distance d5 between the first side surface of the third lens and the aperture stop satisfy the following condition: 0.001≤(d4+d5) / (R3+|R6|)≤0.76.

[0060] Furthermore, the distance d from the aperture to the chip (5-14) 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 image plane, satisfies: 1.08 ≤ d (5-14) / (d (5-14) -BFL)≤7.3.

[0061] Furthermore, the distance d4 between the second side surface of the second lens and the aperture stop and the distance d5 between the first side surface of the third lens and the aperture stop satisfy the following condition: 3.3 ≤ d4 + d5 ≤ 15.4.

[0062] Furthermore, the aperture D11 of the first side of the sixth lens, the distance L from the aperture stop to the imaging plane, and the optical back focal length of the optical lens, i.e., the distance BFL from the center of the second side of the last lens of the optical lens to the center of the imaging plane, satisfy the following condition: 6.4≤D11*BFL / L≤16.2.

[0063] Furthermore, the total focal length F of the optical lens and the exit pupil position EXPP of the optical lens satisfy the following condition: 0.095≤|F / EXPP|≤0.9.

[0064] Furthermore, the radius of curvature R3 of the first side surface of the second lens and the radius of curvature R4 of the second side surface of the second lens satisfy the following condition: 0.272≤(R3-R4) / (R3+R4)≤0.76.

[0065] Furthermore, the sag3 of the first side surface of the second lens and the sag4 of the image side surface of the second lens satisfy the following condition: 0.03≤|sag3 / sag4|≤5.1.

[0066] Furthermore, the overall focal length F of the optical lens, the radius of curvature R1 of the first side surface of the first lens, and the radius of curvature R2 of the second side surface of the first lens satisfy the following condition: 0.05≤|F / R1|+|F / R2|≤3.5.

[0067] According to another aspect of the present invention, an electronic device is provided, characterized in that it includes the aforementioned optical lens and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

[0068] According to the technical solution of the present invention, the optical lens includes, from the first side to the second side, a first lens with positive optical power, a second lens with negative optical power, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with positive optical power, and a sixth lens with positive optical power. The first side of the first lens is convex and the second side is concave; the first side of the second lens is convex and the second side is concave; the second side of the fourth lens is convex; the second side of the fifth lens is convex; and the first side of the sixth lens is convex.

[0069] The first lens has positive optical power, and its first side is convex while its second side is concave. The positive optical power of the first lens converges light rays. Simultaneously, the convex shape of the first side provides a large curvature, which helps to constrict the light rays at the front, reducing the height at which light enters the second lens and thus decreasing the front aperture. The meniscus design of the first lens maximizes the collection of light from a wide field of view into the rear optical system, increasing light transmission. The first lens preferably uses a high-refractive-index material, which facilitates light refraction, achieving a larger field of view, and also helps control the aperture of the rear lenses, enabling miniaturization. Combined with the front focal lengths of the third to sixth lenses, it controls the light path at the center and edges, helping to reduce distortion.

[0070] The second lens has negative optical power, and its first side is convex while its second side is concave. The negative optical power further diverges the light, adjusts the light refraction angle, and reduces chromatic aberration. Simultaneously, the lens's crescent shape facilitates the collection of light from a large field of view, increasing the lens's light transmission. The concave second side of the second lens results in different optical path lengths for light rays from the edge and center fields of view, with a longer optical path at the edge. This facilitates defocus correction of aberrations in the edge field of view and improves resolution.

[0071] The third lens has negative optical power and is preferably made of a high refractive index material, which can further diverge the light. At the same time, when combined with the fourth lens with positive optical power, it is beneficial to achieve small CRA. It also makes the light diverge through the center and edge of the third lens, which is beneficial to enlarge the aperture and improve the system illumination. In addition, when combined with the second lens, it is beneficial to reduce the energy of the ghost image generated by the central reflection.

[0072] The fourth lens has positive optical power, and its second side is convex. The first side of the fourth lens can be either convex or concave. When the first side of the fourth lens is convex, it has positive optical power and converges light rays, effectively converging central and peripheral rays from each field of view, increasing system illumination. Simultaneously, the convex shape of the first side significantly alters the light trajectory, enabling miniaturization of the optical lens while maintaining the same aperture on the first side. When the first side of the fourth lens is concave, it also has positive optical power. Its concave-convex shape, combined with a previously concave-convex lens with negative optical power, corrects chromatic aberration. The meniscus shape of the lens further facilitates the collection of light from a large field of view, increasing the lens's light transmission. The concave first side of the fourth lens causes a significant light reversal upon entry, clearly distinguishing peripheral and central rays from each field of view, altering the trend of peripheral rays, and facilitating aberration correction between central and peripheral rays in each field of view, thus contributing to high resolution.

[0073] The fifth lens has positive optical power, and its second side is convex. The first side of the fifth lens can be either convex or concave. When the first side of the fifth lens is concave, it has positive optical power and a meniscus shape, which helps to better collect light entering through the fourth lens, increasing the system's light transmission. The first side of the fifth lens is concave, and the second side is convex, making the light rays approximately perpendicular to the lens surface. This results in minimal light deflection across different fields of view, low energy loss, and a smooth light transition, reducing lens sensitivity. Preferably, the fifth lens uses a high-refractive-index material in conjunction with the cemented doublet third and fourth lenses to achieve a large focal length, a smooth transition of the front group light rays to the rear group, and is paired with the high-curvature lens of the sixth lens. The fifth lens controls the trajectory of central and peripheral rays, achieving minimal distortion. When the first side of the fifth lens is convex, it possesses positive optical power and converges light rays, effectively converging central and peripheral rays from various fields of view, increasing system illumination, and simultaneously correcting aberrations in both central and peripheral rays, thus achieving high resolution. Furthermore, when the first side of the fifth lens is convex, it works in conjunction with the second side of the fourth lens, ensuring that light rays exiting the fourth lens are incident almost perpendicularly onto the first side of the fifth lens. This facilitates a smooth transition of light, reduces light loss, improves illumination in the peripheral fields of view, and alters the trajectory of peripheral rays, thereby reducing the front diameter of the optical lens, decreasing its size, and contributing to miniaturization and cost reduction.

[0074] The sixth lens has positive optical power, and its first side is convex. Its second side can be either convex or concave. When the second side is convex, the sixth lens, with its positive optical power and convex surface, possesses a large curvature, allowing it to achieve a large focal length in conjunction with the third to fifth lenses. Combined with the first lens, it controls the light path at the center and edges, which helps reduce distortion. With both the first and second sides convex, light entering this surface tends to be perpendicular, resulting in a smooth transition and reducing aberrations, improving resolution, and decreasing lens sensitivity. When the second side is concave, the sixth lens, with its positive optical power and concave surface, has a longer optical path to the imaging plane. Furthermore, the larger aperture of the second side facilitates parallel exit of the principal ray onto the imaging plane, thus contributing to a smaller CRA (Current Aspect Ratio).

[0075] This application employs six 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 low distortion, low telecentricity, weak ghosting, high luminous flux, small aperture, and miniaturization. Attached Figure Description

[0076] 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:

[0077] Figure 1 A schematic diagram of the structure of an optical lens of Example 1 of the present invention is shown;

[0078] Figure 2 A schematic diagram of the structure of the optical lens of Example 2 of the present invention is shown;

[0079] Figure 3 A schematic diagram of the structure of the optical lens of Example 3 of the present invention is shown;

[0080] Figure 4 A schematic diagram of the structure of the optical lens of Example 4 of the present invention is shown;

[0081] Figure 5 A schematic diagram of the structure of the optical lens of Example 5 of the present invention is shown;

[0082] Figure 6 A schematic diagram of the structure of the optical lens of Example Six of the present invention is shown;

[0083] Figure 7 A schematic diagram of the structure of the optical lens of Example Seven of the present invention is shown;

[0084] Figure 8 A schematic diagram of the structure of the optical lens of Example 8 of the present invention is shown.

[0085] The above figures include the following reference numerals:

[0086] 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; STO, Aperture stop; L3, Third lens; S6, First side surface of the third lens; S7, 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; L5, Fifth lens; S9, First side surface of the fifth lens; S10, 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; S13, First side surface of the protective glass; S14, Second side surface of the protective glass; IMA, Imaging plane. Detailed Implementation

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the first side is called the first side surface of the lens, and the surface of each lens closest to the second side is called the second side surface of the lens. The surface shape in the paraxial region can be determined according to the judgment method commonly known in the field, using the R value (R refers to the radius of curvature of the paraxial region, usually the R value in the lens database of optical software) to determine concavity or convexity. For the first side surface, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the second side surface, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0093] 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.

[0094] 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.

[0095] When the optical lens of this application is applied to a projection lens or a radar transmitting lens, the left side is the imaging side and the right side is the image source side. In an exemplary embodiment, the optical lens provided by this application can be used as, for example, a projection lens or a lidar transmitting lens. In this case, the image side of the optical lens can be the image source side, and the object side can be the imaging side. Light rays 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.

[0096] To address the challenges of simultaneously achieving low distortion, low telecentricity, weak ghosting, high luminous flux, small aperture, and miniaturization in existing optical lenses, this invention provides an optical lens and an electronic device.

[0097] Example 1

[0098] like Figures 1 to 8 As shown, the optical lens includes, from the first side to the second side, a first lens with positive optical power, a second lens with negative optical power, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with positive optical power, and a sixth lens with positive optical power. The first side of the first lens is convex and the second side is concave; the first side of the second lens is convex and the second side is concave; the second side of the fourth lens is convex; the second side of the fifth lens is convex; and the first side of the sixth lens is convex.

[0099] The first lens has positive optical power, and its first side is convex while its second side is concave. The positive optical power of the first lens converges light rays. Simultaneously, the convex shape of the first side provides a large curvature, which helps to constrict the light rays at the front, reducing the height at which light enters the second lens and thus decreasing the front aperture. The meniscus design of the first lens maximizes the collection of light from a wide field of view into the rear optical system, increasing light transmission. The first lens preferably uses a high-refractive-index material, which facilitates light refraction, achieving a larger field of view, and also helps control the aperture of the rear lenses, enabling miniaturization. Combined with the front focal lengths of the third to sixth lenses, it controls the light path at the center and edges, helping to reduce distortion.

[0100] The second lens has negative optical power, and its first side is convex while its second side is concave. The negative optical power further diverges the light, adjusts the light refraction angle, and reduces chromatic aberration. Simultaneously, the lens's crescent shape facilitates the collection of light from a large field of view, increasing the lens's light transmission. The concave second side of the second lens results in different optical path lengths for light rays from the edge and center fields of view, with a longer optical path at the edge. This facilitates defocus correction of aberrations in the edge field of view and improves resolution.

[0101] The third lens has negative optical power and is preferably made of a high refractive index material, which can further diverge the light. At the same time, when combined with the fourth lens with positive optical power, it is beneficial to achieve small CRA. It also makes the light diverge through the center and edge of the third lens, which is beneficial to enlarge the aperture and improve the system illumination. In addition, when combined with the second lens, it is beneficial to reduce the energy of the ghost image generated by the central reflection.

[0102] The fourth lens has positive optical power, and its second side is convex. The first side of the fourth lens can be either convex or concave. When the first side of the fourth lens is convex, it has positive optical power and converges light rays, effectively converging central and peripheral rays from each field of view, increasing system illumination. Simultaneously, the convex shape of the first side significantly alters the light trajectory, enabling miniaturization of the optical lens while maintaining the same aperture on the first side. When the first side of the fourth lens is concave, it also has positive optical power. Its concave-convex shape, combined with a previously concave-convex lens with negative optical power, corrects chromatic aberration. The meniscus shape of the lens further facilitates the collection of light from a large field of view, increasing the lens's light transmission. The concave first side of the fourth lens causes a significant light reversal upon entry, clearly distinguishing peripheral and central rays from each field of view, altering the trend of peripheral rays, and facilitating aberration correction between central and peripheral rays in each field of view, thus contributing to high resolution.

[0103] The fifth lens has positive optical power, and its second side is convex. The first side of the fifth lens can be either convex or concave. When the first side of the fifth lens is concave, it has positive optical power and a meniscus shape, which helps to better collect light entering through the fourth lens, increasing the system's light transmission. The first side of the fifth lens is concave, and the second side is convex, making the light rays approximately perpendicular to the lens surface. This results in minimal light deflection across different fields of view, low energy loss, and a smooth light transition, reducing lens sensitivity. Preferably, the fifth lens uses a high-refractive-index material in conjunction with the cemented doublet third and fourth lenses to achieve a large focal length, a smooth transition of the front group light rays to the rear group, and is paired with the high-curvature lens of the sixth lens. The fifth lens controls the trajectory of central and peripheral rays, achieving minimal distortion. When the first side of the fifth lens is convex, it possesses positive optical power and converges light rays, effectively converging central and peripheral rays from various fields of view, increasing system illumination, and simultaneously correcting aberrations in both central and peripheral rays, thus achieving high resolution. Furthermore, when the first side of the fifth lens is convex, it works in conjunction with the second side of the fourth lens, ensuring that light rays exiting the fourth lens are incident almost perpendicularly onto the first side of the fifth lens. This facilitates a smooth transition of light, reduces light loss, improves illumination in the peripheral fields of view, and alters the trajectory of peripheral rays, thereby reducing the front diameter of the optical lens, decreasing its size, and contributing to miniaturization and cost reduction.

[0104] The sixth lens has positive optical power, and its first side is convex. Its second side can be either convex or concave. When the second side is convex, the sixth lens, with its positive optical power and convex surface, possesses a large curvature, allowing it to achieve a large focal length in conjunction with the third to fifth lenses. Combined with the first lens, it controls the light path at the center and edges, which helps reduce distortion. With both the first and second sides convex, light entering this surface tends to be perpendicular, resulting in a smooth transition and reducing aberrations, improving resolution, and decreasing lens sensitivity. When the second side is concave, the sixth lens, with its positive optical power and concave surface, has a longer optical path to the imaging plane. Furthermore, the larger aperture of the second side facilitates parallel exit of the principal ray onto the imaging plane, thus contributing to a smaller CRA (Current Aspect Ratio).

[0105] This application employs six 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 low distortion, low telecentricity, weak ghosting, high luminous flux, small aperture, and miniaturization.

[0106] In this embodiment, the first side of the third lens is concave, and the second side is convex. The third lens has negative optical power and is preferably made of a high refractive index material. Light diverges at the center and edges of the third lens, which helps to enlarge the aperture and improve the system illumination. At the same time, in conjunction with the second lens, it helps to reduce the energy of ghost images generated by central reflection. The second side of the second lens is convex, and the lens shape is crescent-shaped, which helps to collect light from a large field of view and increase the light transmission of the optical lens. At the same time, after being cemented with the fourth lens, the light transition is smoother, which helps to reduce lens sensitivity.

[0107] In this embodiment, the first side surface of the third lens is concave, and the second side surface is also concave. The third lens has negative optical power and is preferably made of a high refractive index material. Light diverges at the center and edges of the third lens, which helps to enlarge the aperture and improve the system illumination. At the same time, in conjunction with the second lens, it helps to reduce the energy of ghost images generated by central reflection. The second side surface of the third lens is concave, which facilitates a smooth transition of light. In addition, in conjunction with the first side surface of the convex fourth lens, it significantly changes the light trajectory, making the light transition smooth and helping to reduce lens sensitivity.

[0108] In this embodiment, the first side of the third lens is convex, and the second side is concave. The third lens has negative optical power and is preferably made of a high refractive index material, which further diverges the light. At the same time, in conjunction with the fourth lens with positive optical power, it is beneficial to achieve small CRA (Collateral Refractive Index). The first side of the third lens is convex, and the second side is concave, so that when the light reaches the second side, the light deflection is small, making it more concentrated when it reaches the imaging plane. This defocusing corrects edge field aberrations, achieves high resolution, and at the same time, the light energy loss is small, which helps to reduce the sensitivity of the lens.

[0109] In this embodiment, the first side surface of the fourth lens is convex. The fourth lens has positive optical power and converges light rays, effectively converging the central and peripheral rays from each field of view to increase the system illumination. At the same time, the convexity of the first side surface of the fourth lens significantly alters the light trajectory, enabling the miniaturization of the optical lens while maintaining the same aperture of the first side surface of the fourth lens.

[0110] In this embodiment, the first side surface of the fourth lens is concave. The fourth lens has positive optical power and a concave-convex shape, which, when paired with the preceding concave-convex lens with negative optical power, corrects chromatic aberration. Simultaneously, the lens shape is meniscus, which facilitates the collection of light from a large field of view and increases the lens's light transmission. The concave first side surface of the fourth lens causes a significant light reversal upon entry, clearly distinguishing the edge rays from the center rays in each field of view. This alters the trend of the edge rays, facilitating aberration correction between the center and edge rays in each field of view, and ultimately contributing to high resolution.

[0111] In this embodiment, the first side of the fifth lens is concave. The fifth lens has positive optical power and a meniscus shape, which is beneficial for better collecting the light entering through the fourth lens and increasing the light transmission of the system. The first side of the fifth lens is concave and the second side is convex, so that the light is approximately perpendicular to the lens surface, the light deflection in each field of view is small, the energy loss is small, and the light transition is smooth, which helps to reduce the sensitivity of the lens. The fifth lens preferably uses a high refractive index material and, together with the cemented doublet third and fourth lenses, can achieve a large focal length, a smooth transition of the front group light to the rear group, and, in conjunction with the high curvature lens of the sixth lens, control the trend of the center and edge light, achieving small distortion.

[0112] In this embodiment, the first side surface of the fifth lens is convex. The fifth lens has positive optical power and converges light rays, effectively converging the central and peripheral rays from each field of view, increasing system illumination, and facilitating the correction of aberrations between the central and peripheral rays, thus achieving high resolution. Furthermore, when the first side surface of the fifth lens is convex, it works in conjunction with the second side surface of the fourth lens, ensuring that the light rays exiting the fourth lens are incident almost perpendicularly onto the first side surface of the fifth lens. This facilitates a smooth transition of light rays, reduces light energy loss, improves illumination in the peripheral field of view, and alters the trajectory of peripheral rays, thereby reducing the front diameter of the optical lens, decreasing its size, and contributing to miniaturization and cost reduction.

[0113] In this embodiment, the second side surface of the sixth lens is convex. The sixth lens has positive optical power and a convex second side surface with a large curvature. Combined with the third to fifth lenses, it achieves a large focal length. Combined with the first lens, it controls the light path at the center and edges, which helps reduce distortion. The first and second sides of the sixth lens are also convex. Light entering this surface tends to be perpendicular, resulting in a smooth transition, which helps reduce aberrations, improve resolution, and also reduces lens sensitivity.

[0114] In this embodiment, the second side surface of the sixth lens is concave. The sixth lens has positive optical power, and the concave second side surface allows light rays to have a longer optical path to reach the imaging surface. Furthermore, the larger aperture of the second side surface of the sixth lens facilitates the parallel emission of the main ray onto the imaging surface, thereby contributing to the realization of a small CRA.

[0115] In this embodiment, the third and fourth lenses are cemented together to form a cemented doublet lens. The use of a cemented doublet lens effectively eliminates ghosting effects on the optical lens and corrects chromatic aberration, ensuring high resolution while eliminating ghosting. The third lens is a negative power lens, which, together with the positive power lens of the subsequent fourth lens, corrects chromatic aberration. The negative lens in the cemented doublet has a higher refractive index (relative to the positive lens), allowing light to converge effectively and smoothly at the final point, ensuring a stable light path to the imaging plane and reducing overall weight and cost. It also reduces light loss caused by reflections between the two lenses. The combination of high and low refractive indices facilitates rapid transition of light from the front, increases the aperture, and enhances light transmission, which is beneficial for night vision requirements. Furthermore, the use of a cemented doublet reduces the air gap between the two lenses, resulting in a more compact overall optical system structure and reducing tolerance sensitivity issues such as overall eccentricity of the lens units during assembly.

[0116] In this embodiment, the optical lens also includes an aperture stop, which is disposed between the second lens and the third lens. The aperture stop's central position between the second and third lenses facilitates effective light convergence entering the optical system, reduces the lens apertures at both ends of the optical system, adjusts the telecentricity of the optical lens, and lowers the system's assembly sensitivity.

[0117] 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 imaging plane of the optical lens, satisfies the following condition with respect to the total focal length F of the optical lens: 1.86 ≤ TTL / F ≤ 6.8. If TTL / F is too large, the system sensitivity will be high; a shorter TTL is beneficial for resolution and system sensitivity. Setting TTL / F within a certain range is beneficial for miniaturization, system resolution, and sensitivity. Preferably, 2.2 ≤ TTL / F ≤ 4.5.

[0118] In this embodiment, the maximum aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view (FOV) of the optical lens satisfy the following condition: 0.02 ≤ D / H / FOV ≤ 0.09. Satisfying this condition helps to ensure a small front aperture, enabling miniaturization. Preferably, 0.026 ≤ D / H / FOV ≤ 0.07. FOV and H are related, representing the field of view corresponding to the image height. H includes the image height x_h in the x-direction and the image height y_h in the y-direction.

[0119] In this embodiment, the overall focal length F of the optical lens, the entrance pupil diameter ENPD of the optical lens, and the maximum effective aperture D of the first side surface of the first lens corresponding to the maximum field of view of the optical lens satisfy the following condition: 0.055 ≤ F / ENPD / D ≤ 0.21. Satisfying this condition ensures a small aperture while maintaining high light transmission, thus achieving miniaturization of the optical lens. Preferably, 0.08 ≤ F / ENPD / D ≤ 0.18.

[0120] In this embodiment, the image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian value θ of the maximum field of view of the optical lens satisfy the following condition: 0.005 ≤ |(HF*θ) / (F*θ)| ≤ 0.095. Satisfying this condition ensures that, while maintaining the field of view and image plane size of the optical lens, reducing the focal length of the optical lens can achieve small distortion, reduce the degree of image distortion, and ensure undistorted imaging. Preferably, 0.018 ≤ |(HF*θ) / (F*θ)| ≤ 0.072. H includes the image height x_h in the x-direction and the image height y_h in the y-direction.

[0121] 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 imaging plane, satisfies the following condition 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 imaging plane: 0.08 ≤ BFL / TTL ≤ 0.98. Satisfying this condition helps meet the special requirements for the back focal length of the optical lens and also provides space for the installation and focusing of optical components, avoiding interference between mechanisms. Preferably, 0.22 ≤ BFL / TTL ≤ 0.76.

[0122] In this embodiment, the optical back focal length (BFL), i.e., the distance from the center of the second side of the last lens to the center of the imaging plane, is proportional 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, satisfies the following ratio: 0.18 ≤ BFL / TL ≤ 4.1. Reasonably controlling the ratio of the back focal length to the lens group length within a certain range can meet the specific requirements of the optical lens's back focal length, reserve space for optical element installation and focusing, avoid mechanical interference, and simultaneously help reduce the energy of ghost images generated by reflections between the lens and prism. Preferably, 0.3 ≤ BFL / TL ≤ 2.2.

[0123] In this embodiment, the total focal length F of the optical lens and the image height H corresponding to the maximum field of view of the optical lens satisfy the following relationship: 0.75 ≤ F / H ≤ 5.3. Controlling the focal length and image height within a certain range is beneficial for improving resolution. Preferably, 1.12 ≤ F / H ≤ 3.2. H includes the image height x_h in the x-direction and the image height y_h in the y-direction.

[0124] In this embodiment, the image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian value θ of the maximum field of view of the optical lens satisfy the following relationship: 0.001 ≤ (H / 2) / (F*tan(θ / 2)) ≤ 3.2. By reasonably setting the ratio of the actual image height to the ideal image height, the imaging effect of the optical lens is improved, achieving a large angular resolution. Preferably, 0.02 ≤ (H / 2) / (F*tan(θ / 2)) ≤ 2.1. H includes the image height x_h in the x-direction and the image height y_h in the y-direction.

[0125] In this embodiment, the combined focal length F of the third lens, fourth lens, fifth lens, and sixth lens is... (3-6) The radius of curvature R1 of the first side surface of the first lens and the radius of curvature R2 of the second side surface of the first lens satisfy the following condition: 0.005 ≤ |F (3-6) / (R1+R2)|≤0.53. The first lens has positive optical power and is designed in a meniscus shape to collect light from a wide field of view. The first side is convex with a large curvature. Combined with the front group focal lengths of the third to sixth lenses, it controls the light path at the center and edges, which helps to reduce distortion. Preferably, 0.07≤|F (3-6) / (R1+R2)|≤0.39.

[0126] In this embodiment, the radius of curvature R3 of the first side surface of the second lens, the radius of curvature R6 of the first side surface of the third lens, and the distance d4 between the second side surface of the second lens and the aperture stop, and the distance d5 between the first side surface of the third lens and the aperture stop, satisfy the following condition: 0.001 ≤ (d4 + d5) / (R3 + |R6|) ≤ 0.76. By reasonably controlling the curvature of the second and third lenses and simultaneously setting the distances between the second and third lenses and the aperture stop, the second and third lenses effectively cooperate, which helps to reduce the energy of the ghost image generated by the central reflection. Preferably, 0.023 ≤ (d4 + d5) / (R3 + |R6|) ≤ 0.52.

[0127] In this embodiment, the distance d from the aperture to the chip (5-14) 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 image plane, satisfies: 1.08 ≤ d (5-14) / (d (5-14) -BFL)≤7.3. By reasonably controlling the distance from the aperture to the chip, and simultaneously coordinating with effective control of the back focal length, it is beneficial to achieve a small CRA. Preferably, 1.6≤d (5-14) / (d (5-14) -BFL)≤4.2.

[0128] In this embodiment, the distance d4 between the second side surface of the second lens and the aperture stop and the distance d5 between the first side surface of the third lens and the aperture stop satisfy the following condition: 3.3 ≤ d4 + d5 ≤ 15.4. Reasonably controlling the distance between the aperture stop and the third lens, the longer the distance, the better for achieving a small CRA (Cost Reduction Arrangement). Preferably, 5.4 ≤ d4 + d5 ≤ 13.2.

[0129] In this embodiment, the aperture D11 of the first side of the sixth lens, the distance L from the aperture stop to the imaging plane, and the optical back focal length of the optical lens, i.e., the distance BFL from the center of the second side of the last lens of the optical lens to the center of the imaging plane, satisfy the following condition: 6.4 ≤ D11 * BFL / L ≤ 16.2. Ensuring a long back focal length under the same imaging plane and image height is beneficial for achieving a small CRA (Cost Reduction Aspect Ratio). Preferably, 8.1 ≤ D11 * BFL / L ≤ 13.3.

[0130] In this embodiment, the total focal length F of the optical lens and the exit pupil position EXPP of the optical lens satisfy the following condition: 0.095 ≤ |F / EXPP| ≤ 0.9. Satisfying this condition means that for the same focal length, a farther exit pupil is more conducive to achieving a smaller CRA (Cost Reduction Arrangement). Preferably, 0.11 ≤ |F / EXPP| ≤ 0.54.

[0131] In this embodiment, the radius of curvature R3 of the first side surface of the second lens and the radius of curvature R4 of the second side surface of the second lens satisfy the condition: 0.272 ≤ (R3 - R4) / (R3 + R4) ≤ 0.76. Satisfying this condition corrects the aberrations of the optical system and ensures that the incident light rays from the first lens are relatively smooth when incident on the first side surface of the second lens, thereby reducing the tolerance sensitivity of the optical system. Preferably, 0.3 ≤ (R3 - R4) / (R3 + R4) ≤ 0.6.

[0132] In this embodiment, the refractive index Nd2 of the second lens, the radius of curvature R3 of the first side surface of the second lens, the radius of curvature R4 of the second side surface of the second lens, and the thickness d3 of the second lens satisfy the following condition: -0.088≤(Nd2-1)*(1 / R3-1 / R4)+(Nd2-1)2*d3 / (Nd2*R3*R4)≤-0.01. Satisfying this condition ensures that the focal length of the second lens is negative, ensuring that the second lens diverges light, which is beneficial for achieving a large aperture and increasing light throughput. Preferably, -0.07≤(Nd2-1)*(1 / R3-1 / R4)+(Nd2-1)2*d3 / (Nd2*R3*R4)≤-0.03.

[0133] In this embodiment, the sagitta of the first side surface of the second lens, sag3, and the sagitta of the image side surface of the second lens, sag4, satisfy the condition: 0.03 ≤ |sag3 / sag4| ≤ 5.1. Reasonably setting the sagitta of the front and rear surfaces of the second lens, making them close, facilitates smooth light transition and reduces lens sensitivity. Preferably, 0.003 ≤ |sag3 / sag4| ≤ 2.9.

[0134] In this embodiment, the overall focal length F of the optical lens, the radius of curvature R1 of the first side surface of the first lens, and the radius of curvature R2 of the second side surface of the first lens satisfy the following condition: 0.05 ≤ |F / R1| + |F / R2| ≤ 3.5. By controlling the radii of curvature of the two surfaces of the first lens, incident light can be assisted in entering the optical system, aberrations can be corrected, and image quality can be improved. Preferably, 1.1 ≤ |F / R1| + |F / R2| ≤ 2.7.

[0135] Example 2

[0136] like Figures 1 to 8As shown, the optical lens, from the first side to the second side, sequentially includes: a first lens with positive optical power; a second lens with negative optical power; a third lens with negative optical power; a fourth lens with positive optical power; a fifth lens with positive optical power; and a sixth lens with positive optical power. The total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the imaging plane of the optical lens, satisfies the following condition with respect to the total focal length F of the optical lens: 1.86 ≤ TTL / F ≤ 6.8. If TTL / F is too large, the system sensitivity will be high; a shorter TTL is beneficial for resolution and system sensitivity. Setting TTL / F within a certain range can facilitate miniaturization, system resolution, and sensitivity. Preferably, 2.2 ≤ TTL / F ≤ 4.5.

[0137] In this embodiment, the first side of the first lens is convex, and the second side is concave. The first lens has positive optical power and converges light; at the same time, the first side is convex, with a large curvature, which helps to constrict the light at the front end, reducing the height at which the light enters the second lens and thus reducing the front aperture; the first lens is designed in a meniscus shape to collect as much light as possible from a large field of view into the rear optical system, increasing the light transmission; the first lens preferably uses a high refractive index material, which is beneficial for deflecting light and achieving a larger field of view, while also helping to control the aperture of the rear lens and achieve miniaturization; in conjunction with the front group focal length of the third to sixth lenses, it controls the light path at the center and edges, which helps to reduce distortion.

[0138] 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, adjusts the light refraction angle, and reduces chromatic aberration. At the same time, the lens shape is crescent-shaped, which is beneficial for collecting light from a large field of view and increasing the light transmission of the lens. The second side of the second lens is concave, so the optical path length of the light rays in the edge field of view and the center field of view is different when passing through the second lens. The optical path length of the edge field of view is longer, which is beneficial for defocusing and correcting aberrations in the edge field of view, thereby improving resolution.

[0139] In this embodiment, the first side of the third lens is concave, and the second side is convex. The third lens has negative optical power and is preferably made of a high refractive index material. Light diverges at the center and edges of the third lens, which helps to enlarge the aperture and improve the system illumination. At the same time, in conjunction with the second lens, it helps to reduce the energy of ghost images generated by central reflection. The second side of the second lens is convex, and the lens shape is crescent-shaped, which helps to collect light from a large field of view and increase the light transmission of the optical lens. At the same time, after being cemented with the fourth lens, the light transition is smoother, which helps to reduce lens sensitivity.

[0140] In this embodiment, the first side surface of the third lens is concave, and the second side surface is also concave. The third lens has negative optical power and is preferably made of a high refractive index material. Light diverges at the center and edges of the third lens, which helps to enlarge the aperture and improve the system illumination. At the same time, in conjunction with the second lens, it helps to reduce the energy of ghost images generated by central reflection. The second side surface of the third lens is concave, which facilitates a smooth transition of light. In addition, in conjunction with the first side surface of the convex fourth lens, it significantly changes the light trajectory, making the light transition smooth and helping to reduce lens sensitivity.

[0141] In this embodiment, the first side of the third lens is convex, and the second side is concave. The third lens has negative optical power and is preferably made of a high refractive index material, which further diverges the light. At the same time, in conjunction with the fourth lens with positive optical power, it is beneficial to achieve small CRA (Collateral Refractive Index). The first side of the third lens is convex, and the second side is concave, so that when the light reaches the second side, the light deflection is small, making it more concentrated when it reaches the imaging plane. This defocusing corrects edge field aberrations, achieves high resolution, and at the same time, the light energy loss is small, which helps to reduce the sensitivity of the lens.

[0142] In this embodiment, both the first and second sides of the fourth lens are convex. The fourth lens has positive optical power and converges light rays, effectively converging the central and peripheral rays from each field of view to increase system illumination. Simultaneously, the convex nature of the first side of the fourth lens significantly alters the light trajectory, enabling miniaturization of the optical lens while maintaining the same aperture on the first side.

[0143] In this embodiment, the first side of the fourth lens is concave, and the second side is convex. The fourth lens has positive optical power and its concave-convex shape, combined with the preceding concave-convex lens with negative optical power, corrects chromatic aberration. Simultaneously, the lens shape is meniscus, which facilitates the collection of light from a large field of view and increases the lens's light transmission. The concave first side of the fourth lens causes a significant light reversal upon entry, clearly distinguishing the edge rays from the center rays in each field of view. This alters the trend of the edge rays, facilitating aberration correction between the center and edge rays in each field of view, and contributing to high resolution.

[0144] In this embodiment, the first side of the fifth lens is concave, and the second side is convex. The fifth lens has positive optical power and a meniscus shape, which is beneficial for better collecting the light entering through the fourth lens and increasing the light transmission of the system. The concave first side and convex second side of the fifth lens make the light approximately perpendicular to the lens surface, resulting in small light deflection in each field of view, low energy loss, and smooth light transition, which helps to reduce the sensitivity of the lens. The fifth lens preferably uses a high refractive index material and, together with the cemented doublet third and fourth lenses, can achieve a large focal length, a smooth transition of the front group light to the rear group, and, in conjunction with the high curvature lens of the sixth lens, control the light path of the center and the edges, achieving small distortion.

[0145] In this embodiment, both the first and second sides of the fifth lens are convex. The fifth lens has positive optical power and converges light rays, effectively converging the central and peripheral rays from each field of view, increasing system illumination, and simultaneously correcting aberrations between the central and peripheral rays, achieving high resolution. Furthermore, when the first side of the fifth lens is convex, it works in conjunction with the second side of the fourth lens, ensuring that the light rays exiting the fourth lens are almost perpendicularly incident on the first side of the fifth lens. This facilitates a smooth transition of light, reduces light energy loss, improves illumination in the peripheral field of view, and alters the trajectory of peripheral rays, thereby reducing the front diameter of the optical lens, decreasing its size, and contributing to miniaturization and cost reduction.

[0146] In this embodiment, the first and second sides of the sixth lens are convex. The sixth lens has positive optical power and a convex second side with a large curvature. Combined with the third to fifth lenses, it achieves a large focal length. Combined with the first lens, it controls the light path at the center and edges, which helps reduce distortion. Because both the first and second sides of the sixth lens are convex, light entering this surface tends to be perpendicular, resulting in a smooth transition. This helps reduce aberrations, improves resolution, and also reduces lens sensitivity.

[0147] In this embodiment, the first side of the sixth lens is convex, and the second side is concave. The sixth lens has positive optical power, and the concave second side allows light rays to travel a longer optical path to the imaging surface. Furthermore, the larger aperture of the second side of the sixth lens facilitates the parallel emission of the main ray onto the imaging surface, thereby contributing to the realization of a small CRA.

[0148] This application employs six 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 low distortion, low telecentricity, weak ghosting, high luminous flux, small aperture, and miniaturization.

[0149] In this embodiment, the third and fourth lenses are cemented together to form a cemented doublet lens. The use of a cemented doublet lens effectively eliminates ghosting effects on the optical lens and corrects chromatic aberration, ensuring high resolution while eliminating ghosting. The third lens is a negative power lens, which, together with the positive power lens of the subsequent fourth lens, corrects chromatic aberration. The negative lens in the cemented doublet has a higher refractive index (relative to the positive lens), allowing light to converge effectively and smoothly at the final point, ensuring a stable light path to the imaging plane and reducing overall weight and cost. It also reduces light loss caused by reflections between the two lenses. The combination of high and low refractive indices facilitates rapid transition of light from the front, increases the aperture, and enhances light transmission, which is beneficial for night vision requirements. Furthermore, the use of a cemented doublet reduces the air gap between the two lenses, resulting in a more compact overall optical system structure and reducing tolerance sensitivity issues such as overall eccentricity of the lens units during assembly.

[0150] In this embodiment, the optical lens also includes an aperture stop, which is disposed between the second lens and the third lens. The aperture stop's central position between the second and third lenses facilitates effective light convergence entering the optical system, reduces the lens apertures at both ends of the optical system, adjusts the telecentricity of the optical lens, and lowers the system's assembly sensitivity.

[0151] In this embodiment, the refractive index Nd2 of the second lens, the radius of curvature R3 of the first side surface of the second lens, the radius of curvature R4 of the second side surface of the second lens, and the thickness d3 of the second lens satisfy the following condition: -0.088≤(Nd2-1)*(1 / R3-1 / R4)+(Nd2-1)2*d3 / (Nd2*R3*R4)≤-0.01. Satisfying this condition ensures that the focal length of the second lens is negative, ensuring that the second lens diverges light, which is beneficial for achieving a large aperture and increasing light throughput. Preferably, -0.07≤(Nd2-1)*(1 / R3-1 / R4)+(Nd2-1)2*d3 / (Nd2*R3*R4)≤-0.03.

[0152] In this embodiment, the maximum aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view (FOV) of the optical lens satisfy the following condition: 0.02 ≤ D / H / FOV ≤ 0.09. Satisfying this condition helps to ensure a small front aperture, enabling miniaturization. Preferably, 0.026 ≤ D / H / FOV ≤ 0.07. FOV and H are related, representing the field of view corresponding to the image height. H includes the image height x_h in the x-direction and the image height y_h in the y-direction.

[0153] In this embodiment, the overall focal length F of the optical lens, the entrance pupil diameter ENPD of the optical lens, and the maximum effective aperture D of the first side surface of the first lens corresponding to the maximum field of view of the optical lens satisfy the following condition: 0.055 ≤ F / ENPD / D ≤ 0.21. Satisfying this condition ensures a small aperture while maintaining high light transmission, thus achieving miniaturization of the optical lens. Preferably, 0.08 ≤ F / ENPD / D ≤ 0.18.

[0154] In this embodiment, the image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian value θ of the maximum field of view of the optical lens satisfy the following condition: 0.005 ≤ |(HF*θ) / (F*θ)| ≤ 0.095. Satisfying this condition ensures that, while maintaining the field of view and image plane size of the optical lens, reducing the focal length of the optical lens can achieve small distortion, reduce the degree of image distortion, and ensure undistorted imaging. Preferably, 0.018 ≤ |(HF*θ) / (F*θ)| ≤ 0.072. H includes the image height x_h in the x-direction and the image height y_h in the y-direction.

[0155] 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 imaging plane, satisfies the following condition 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 imaging plane: 0.08 ≤ BFL / TTL ≤ 0.98. Satisfying this condition helps meet the special requirements for the back focal length of the optical lens and also provides space for the installation and focusing of optical components, avoiding interference between mechanisms. Preferably, 0.22 ≤ BFL / TTL ≤ 0.76.

[0156] In this embodiment, the optical back focal length (BFL), i.e., the distance from the center of the second side of the last lens to the center of the imaging plane, is proportional 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, satisfies the following ratio: 0.18 ≤ BFL / TL ≤ 4.1. Reasonably controlling the ratio of the back focal length to the lens group length within a certain range can meet the specific requirements of the optical lens's back focal length, reserve space for optical element installation and focusing, avoid mechanical interference, and simultaneously help reduce the energy of ghost images generated by reflections between the lens and prism. Preferably, 0.3 ≤ BFL / TL ≤ 2.2.

[0157] In this embodiment, the total focal length F of the optical lens and the image height H corresponding to the maximum field of view of the optical lens satisfy the following relationship: 0.75 ≤ F / H ≤ 5.3. Controlling the focal length and image height within a certain range is beneficial for improving resolution. Preferably, 1.12 ≤ F / H ≤ 3.2. H includes the image height x_h in the x-direction and the image height y_h in the y-direction.

[0158] In this embodiment, the image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian value θ of the maximum field of view of the optical lens satisfy the following relationship: 0.001 ≤ (H / 2) / (F*tan(θ / 2)) ≤ 3.2. By reasonably setting the ratio of the actual image height to the ideal image height, the imaging effect of the optical lens is improved, achieving a large angular resolution. Preferably, 0.02 ≤ (H / 2) / (F*tan(θ / 2)) ≤ 2.1. H includes the image height x_h in the x-direction and the image height y_h in the y-direction.

[0159] In this embodiment, the combined focal length F of the third lens, fourth lens, fifth lens, and sixth lens is... (3-6) The radius of curvature R1 of the first side surface of the first lens and the radius of curvature R2 of the second side surface of the first lens satisfy the following condition: 0.005 ≤ |F (3-6) / (R1+R2)|≤0.53. The first lens has positive optical power and is designed in a meniscus shape to collect light from a wide field of view. The first side is convex with a large curvature. Combined with the front group focal lengths of the third to sixth lenses, it controls the light path at the center and edges, which helps to reduce distortion. Preferably, 0.07≤|F (3-6) / (R1+R2)|≤0.39.

[0160] In this embodiment, the radius of curvature R3 of the first side surface of the second lens, the radius of curvature R6 of the first side surface of the third lens, and the distance d4 between the second side surface of the second lens and the aperture stop, and the distance d5 between the first side surface of the third lens and the aperture stop, satisfy the following condition: 0.001 ≤ (d4 + d5) / (R3 + |R6|) ≤ 0.76. By reasonably controlling the curvature of the second and third lenses and simultaneously setting the distances between the second and third lenses and the aperture stop, the second and third lenses effectively cooperate, which helps to reduce the energy of the ghost image generated by the central reflection. Preferably, 0.023 ≤ (d4 + d5) / (R3 + |R6|) ≤ 0.52.

[0161] In this embodiment, the distance d from the aperture to the chip (5-14) 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 image plane, satisfies: 1.08 ≤ d (5-14) / (d (5-14) -BFL)≤7.3. By reasonably controlling the distance from the aperture to the chip, and simultaneously coordinating with effective control of the back focal length, it is beneficial to achieve a small CRA. Preferably, 1.6≤d (5-14) / (d (5-14) -BFL)≤4.2.

[0162] In this embodiment, the distance d4 between the second side surface of the second lens and the aperture stop and the distance d5 between the first side surface of the third lens and the aperture stop satisfy the following condition: 3.3 ≤ d4 + d5 ≤ 15.4. Reasonably controlling the distance between the aperture stop and the third lens, the longer the distance, the better for achieving a small CRA (Cost Reduction Arrangement). Preferably, 5.4 ≤ d4 + d5 ≤ 13.2.

[0163] In this embodiment, the aperture D11 of the first side of the sixth lens, the distance L from the aperture stop to the imaging plane, and the optical back focal length of the optical lens, i.e., the distance BFL from the center of the second side of the last lens of the optical lens to the center of the imaging plane, satisfy the following condition: 6.4 ≤ D11 * BFL / L ≤ 16.2. Ensuring a long back focal length under the same imaging plane and image height is beneficial for achieving a small CRA (Cost Reduction Aspect Ratio). Preferably, 8.1 ≤ D11 * BFL / L ≤ 13.3.

[0164] In this embodiment, the total focal length F of the optical lens and the exit pupil position EXPP of the optical lens satisfy the following condition: 0.095 ≤ |F / EXPP| ≤ 0.9. Satisfying this condition means that for the same focal length, a farther exit pupil is more conducive to achieving a smaller CRA (Cost Reduction Arrangement). Preferably, 0.11 ≤ |F / EXPP| ≤ 0.54.

[0165] In this embodiment, the radius of curvature R3 of the first side surface of the second lens and the radius of curvature R4 of the second side surface of the second lens satisfy the condition: 0.272 ≤ (R3 - R4) / (R3 + R4) ≤ 0.76. Satisfying this condition corrects the aberrations of the optical system and ensures that the incident light rays from the first lens are relatively smooth when incident on the first side surface of the second lens, thereby reducing the tolerance sensitivity of the optical system. Preferably, 0.3 ≤ (R3 - R4) / (R3 + R4) ≤ 0.6.

[0166] In this embodiment, the sagitta of the first side surface of the second lens, sag3, and the sagitta of the image side surface of the second lens, sag4, satisfy the condition: 0.03 ≤ |sag3 / sag4| ≤ 5.1. Reasonably setting the sagitta of the front and rear surfaces of the second lens, making them close, facilitates smooth light transition and reduces lens sensitivity. Preferably, 0.003 ≤ |sag3 / sag4| ≤ 2.9.

[0167] In this embodiment, the overall focal length F of the optical lens, the radius of curvature R1 of the first side surface of the first lens, and the radius of curvature R2 of the second side surface of the first lens satisfy the following condition: 0.05 ≤ |F / R1| + |F / R2| ≤ 3.5. By controlling the radii of curvature of the two surfaces of the first lens, incident light can be assisted in entering the optical system, aberrations can be corrected, and image quality can be improved. Preferably, 1.1 ≤ |F / R1| + |F / R2| ≤ 2.7.

[0168] Optionally, the optical lens may also include a prism located on the second side of the sixth lens, a color filter for correcting color deviation, and a protective glass for protecting the photosensitive element located on the imaging surface.

[0169] The optical lens in this application can employ multiple lenses, such as the six lenses mentioned above. This application does not specifically limit the number of spherical and aspherical lenses; when image quality is a primary concern, the number of aspherical lenses can be increased. The characteristic of an aspherical lens is that its curvature changes continuously from the lens center to the lens periphery. Unlike a spherical lens, which has a constant curvature from the lens center to the lens periphery, an aspherical lens has better curvature radius characteristics, offering advantages in improving distortion aberrations and astigmatism. By using aspherical lenses, aberrations occurring during imaging can be eliminated as much as possible, thereby improving image quality.

[0170] In this exemplary embodiment, the solution is not limited to plastic or glass for the lenses. If temperature performance is a primary concern, the first, second, third, fourth, fifth, and sixth 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 fifth lenses can all be aspherical glass lenses. Of course, in applications with lower temperature stability requirements, the first to sixth lenses in the optical lens can also be made of plastic. Using plastic to make optical lenses can effectively reduce manufacturing costs. Of course, the first to sixth lenses in the optical lens can also be made of a combination of plastic and glass. Preferably, the first to sixth lenses in the optical lens are all-glass, which allows for use in harsher environments and provides better optical performance.

[0171] 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.

[0172] 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 six lenses are described as an example in the embodiments, the optical lens is not limited to including six lenses. If necessary, the optical lens may also include other numbers of lenses.

[0173] 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.

[0174] It should be noted that any of the examples one through eight below are applicable to all embodiments of this application.

[0175] Example 1

[0176] like Figure 1 The diagram shown is a schematic of the optical lens structure of Example 1.

[0177] 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, aperture STO, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, first side surface of protective glass S13, second side surface of protective glass S14, and imaging surface IMA.

[0178] The first lens L1 has positive optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is convex, and its second side surface S4 is concave. The third lens L3 has negative optical power, its first side surface S6 is concave, and its second side surface S7 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 positive optical power, its first side surface S9 is concave, and its second side surface S10 is convex. The sixth lens L6 has positive optical power, its first side surface S11 is convex, and its second side surface S12 is convex. Light from the first side passes sequentially through surfaces S1 to S14 and is finally imaged onto the imaging plane IMA. Since the third lens L3 and the fourth lens L4 are cemented together to form a cemented doublet lens, the second side surface S7 of the third lens and the first side surface S7 of the fourth lens are the same surface.

[0179] In this example, the total effective focal length F of the optical lens is 21.354mm, the maximum field of view (FOV) of the optical lens is 32.910°, and the total length (TTL) of the optical lens is 60.810mm.

[0180] 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).

[0181] 1 16.782 3.863 1.72 37.99 2 55.340 0.100 3 13.837 5.630 1.73 28.32 4 5.468 4.670 STO Infinity 5.000 6 -12.880 1.570 1.78 25.72 7 -63.950 4.200 1.50 81.61 8 -9.290 0.230 9 -171.780 4.000 1.50 81.61 10 -18.390 0.100 11 38.350 3.570 1.77 49.61 12 -92.750 26.467 13 Infinity 1.100 1.51 62.91 14 Infinity 0.310 IMA / /

[0182] Table 1

[0183] In Example 1, none of the surfaces of the first lens L1 to the sixth lens L6 are aspherical.

[0184] Example 2

[0185] like Figure 2 The diagram shown is a schematic representation of the optical lens structure in Example 2. For the sake of brevity, descriptions similar to those in Example 1 will be omitted in this example and the following examples.

[0186] 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, aperture STO, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, first side surface of protective glass S13, second side surface of protective glass S14, and imaging surface IMA.

[0187] The first lens L1 has positive optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is convex, and its second side surface S4 is concave. The third lens L3 has negative optical power, its first side surface S6 is concave, and its second side surface S7 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 positive optical power, its first side surface S9 is concave, and its second side surface S10 is convex. The sixth lens L6 has positive optical power, its first side surface S11 is convex, and its second side surface S12 is convex. Light from the first side passes sequentially through surfaces S1 to S14 and is finally imaged onto the imaging plane IMA. Since the third lens L3 and the fourth lens L4 are cemented together to form a cemented doublet lens, the second side surface S7 of the third lens and the first side surface S7 of the fourth lens are the same surface.

[0188] In this example, the total effective focal length F of the optical lens is 21.330mm, the maximum field of view (FOV) of the optical lens is 32.960°, and the total length (TTL) of the optical lens is 60.810mm.

[0189] Table 2 shows the basic structural parameters of the optical lens in Example 2, where the units for radius of curvature (Radius) and thickness / distance are millimeters (mm).

[0190] 1 16.777 3.781 1.72 37.99 2 55.957 0.094 3 13.761 5.610 1.73 28.32 4 5.406 4.651 STO Infinity 5.122 6 -13.315 1.591 1.78 25.72 7 -46.247 4.252 1.50 81.61 8 -9.378 0.230 9 -144.410 3.901 1.50 81.61 10 -18.833 0.198 11 38.980 3.521 1.77 49.61 12 -95.758 26.450 13 Infinity 1.100 1.51 62.91 14 Infinity 0.310 IMA / /

[0191] Table 2

[0192] In Example 2, none of the surfaces of the first lens L1 to the sixth lens L6 are aspherical.

[0193] Example 3

[0194] like Figure 3 The diagram shown is a schematic of the optical lens structure in Example 3.

[0195] like Figure 3 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, aperture STO, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, first side surface of protective glass S13, second side surface of protective glass S14, and imaging surface IMA.

[0196] The first lens L1 has positive optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is convex, and its second side surface S4 is concave. The third lens L3 has negative optical power, its first side surface S6 is convex, and its second side surface S7 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 positive optical power, its first side surface S9 is concave, and its second side surface S10 is convex. The sixth lens L6 has positive optical power, its first side surface S11 is convex, and its second side surface S12 is convex. Light from the first side passes sequentially through surfaces S1 to S14 and is finally imaged onto the imaging plane IMA. Since the third lens L3 and the fourth lens L4 are cemented together to form a cemented doublet lens, the second side surface S7 of the third lens and the first side surface S7 of the fourth lens are the same surface.

[0197] In this example, the total effective focal length F of the optical lens is 22.465mm, the maximum field of view (FOV) of the optical lens is 31.800°, and the total length (TTL) of the optical lens is 69.504mm.

[0198] Table 3 shows the basic structural parameters of the optical lens in Example 3, where the units for radius of curvature (Radius) and thickness / distance are millimeters (mm).

[0199] 1 16.431 5.728 1.72 37.99 2 36.029 0.100 3 17.529 6.238 1.73 28.32 4 6.059 6.134 STO Infinity 4.328 6 100.010 5.981 1.78 25.72 7 22.263 6.002 1.50 81.61 8 -13.416 0.100 9 -57.595 3.490 1.50 81.61 10 -22.696 0.100 11 58.483 3.279 1.77 49.61 12 -73.842 26.615 13 Infinity 1.100 1.51 62.91 14 Infinity 0.310 IMA / /

[0200] Table 3

[0201] In Example 3, none of the surfaces of the first lens L1 to the sixth lens L6 are aspherical.

[0202] Example 4

[0203] like Figure 4 The diagram shown is a schematic of the optical lens structure of Example 4.

[0204] 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, aperture STO, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, first side surface of protective glass S13, second side surface of protective glass S14, and imaging surface IMA.

[0205] The first lens L1 has positive optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is convex, and its second side surface S4 is concave. The third lens L3 has negative optical power, its first side surface S6 is convex, and its second side surface S7 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 positive optical power, its first side surface S9 is concave, and its second side surface S10 is convex. The sixth lens L6 has positive optical power, its first side surface S11 is convex, and its second side surface S12 is convex. Light from the first side passes sequentially through surfaces S1 to S14 and is finally imaged onto the imaging plane IMA. Since the third lens L3 and the fourth lens L4 are cemented together to form a cemented doublet lens, the second side surface S7 of the third lens and the first side surface S7 of the fourth lens are the same surface.

[0206] In this example, the total effective focal length F of the optical lens is 22.378mm, the maximum field of view (FOV) of the optical lens is 31.951°, and the total length (TTL) of the optical lens is 69.545mm.

[0207] Table 4 shows the basic structural parameters of the optical lens in Example 4, where the units for radius of curvature (Radius) and thickness / distance are millimeters (mm).

[0208] 1 16.400 5.730 1.72 37.99 2 36.000 0.100 3 17.530 6.240 1.73 28.32 4 6.000 6.140 STO Infinity 4.330 6 100.000 6.000 1.78 25.72 7 22.260 6.000 1.50 81.61 8 -13.400 0.100 9 -57.600 3.500 1.50 81.61 10 -22.700 0.100 11 58.500 3.280 1.77 49.61 12 -73.850 26.615 13 Infinity 1.100 1.51 62.91 14 Infinity 0.310 IMA / /

[0209] Table 4

[0210] In Example 4, none of the surfaces of the first lens L1 to the sixth lens L6 are aspherical.

[0211] Example 5

[0212] like Figure 5 The diagram shown is a schematic of the optical lens structure of Example 5.

[0213] 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, aperture STO, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, first side surface of protective glass S13, second side surface of protective glass S14, and imaging surface IMA.

[0214] The first lens L1 has positive optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is convex, and its second side surface S4 is concave. The third lens L3 has negative optical power, its first side surface S6 is concave, and its second side surface S7 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 positive optical power, its first side surface S9 is concave, and its second side surface S10 is convex. The sixth lens L6 has positive optical power, its first side surface S11 is convex, and its second side surface S12 is concave. Light from the first side passes sequentially through surfaces S1 to S14 and is finally imaged onto the imaging plane IMA. Since the third lens L3 and the fourth lens L4 are cemented together to form a cemented doublet lens, the second side surface S7 of the third lens and the first side surface S7 of the fourth lens are the same surface.

[0215] In this example, the total effective focal length F of the optical lens is 20.996mm, the maximum field of view (FOV) of the optical lens is 33.530°, and the total length (TTL) of the optical lens is 60.812mm.

[0216] Table 5 shows the basic structural parameters of the optical lens in Example 5, where the units for radius of curvature (Radius) and thickness / distance are millimeters (mm).

[0217] 1 14.977 3.353 1.72 37.99 2 51.397 0.100 3 12.235 4.399 1.73 28.32 4 5.275 4.457 STO Infinity 3.506 6 -16.436 3.646 1.78 25.72 7 173.553 6.007 1.50 81.61 8 -10.194 0.170 9 -272.921 4.104 1.50 81.61 10 -19.240 0.100 11 28.161 3.112 1.77 49.61 12 95.005 26.448 13 Infinity 1.100 1.51 62.91 14 Infinity 0.310 IMA / /

[0218] Table 5

[0219] In Example 5, none of the surfaces of the first lens L1 to the sixth lens L6 are aspherical.

[0220] Example 6

[0221] like Figure 6 The diagram shown is a schematic of the optical lens structure of Example 6.

[0222] 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, aperture STO, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, first side surface of protective glass S13, second side surface of protective glass S14, and imaging surface IMA.

[0223] The first lens L1 has positive optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is convex, and its second side surface S4 is concave. The third lens L3 has negative optical power, its first side surface S6 is concave, and its second side surface S7 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 positive optical power, its first side surface S9 is concave, and its second side surface S10 is convex. The sixth lens L6 has positive optical power, its first side surface S11 is convex, and its second side surface S12 is concave. Light from the first side passes sequentially through surfaces S1 to S14 and is finally imaged onto the imaging plane IMA. Since the third lens L3 and the fourth lens L4 are cemented together to form a cemented doublet lens, the second side surface S7 of the third lens and the first side surface S7 of the fourth lens are the same surface.

[0224] In this example, the total effective focal length F of the optical lens is 21.114mm, the maximum field of view (FOV) of the optical lens is 33.383°, and the total length (TTL) of the optical lens is 60.806mm.

[0225] Table 6 shows the basic structural parameters of the optical lens in Example 6, where the units for radius of curvature (Radius) and thickness / distance are millimeters (mm).

[0226] 1 14.980 3.370 1.72 37.99 2 51.400 0.100 3 12.240 4.399 1.73 28.32 4 5.275 4.457 STO Infinity 3.500 6 -16.500 3.646 1.78 25.72 7 173.500 6.000 1.50 81.61 8 -10.300 0.170 9 -272.900 4.104 1.50 81.61 10 -19.240 0.100 11 28.000 3.100 1.77 49.61 12 95.000 26.450 13 Infinity 1.100 1.51 62.91 14 Infinity 0.310 IMA / /

[0227] Table 6

[0228] In Example 6, none of the surfaces of the first lens L1 to the sixth lens L6 are aspherical.

[0229] Example 7

[0230] like Figure 7 The diagram shown is a schematic of the optical lens structure of Example 7.

[0231] like Figure 7As shown, the optical lens includes, from the first side to the second side, the following components in sequence: first lens L1, second lens L2, aperture STO, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, first side surface of protective glass S13, second side surface of protective glass S14, and imaging surface IMA.

[0232] The first lens L1 has positive optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is convex, and its second side surface S4 is concave. The third lens L3 has negative optical power, its first side surface S6 is concave, and its second side surface S7 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 positive optical power, its first side surface S9 is convex, and its second side surface S10 is convex. The sixth lens L6 has positive optical power, its first side surface S11 is convex, and its second side surface S12 is convex. Light from the first side passes sequentially through surfaces S1 to S14 and is finally imaged onto the imaging plane IMA. Since the third lens L3 and the fourth lens L4 are cemented together to form a cemented doublet lens, the second side surface S7 of the third lens and the first side surface S7 of the fourth lens are the same surface.

[0233] In this example, the total effective focal length F of the optical lens is 21.274mm, the maximum field of view (FOV) of the optical lens is 33.088°, and the total length (TTL) of the optical lens is 60.812mm.

[0234] Table 7 shows the basic structural parameters of the optical lens in Example 7, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0235] 1 16.452 3.453 1.72 37.99 2 53.527 0.103 3 14.042 6.007 1.73 28.32 4 5.270 4.180 STO Infinity 4.710 6 -15.612 2.397 1.78 25.72 7 -140.101 4.555 1.50 81.61 8 -9.527 0.100 9 175.000 4.105 1.50 81.61 10 -21.865 0.077 11 56.050 3.267 1.77 49.61 12 -78.498 26.447 13 Infinity 1.100 1.51 62.91 14 Infinity 0.310 IMA / /

[0236] Table 7

[0237] In Example 7, none of the surfaces of the first lens L1 to the sixth lens L6 are aspherical.

[0238] Example 8

[0239] like Figure 8 The diagram shown is a schematic of the optical lens structure of Example 8.

[0240] 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, aperture STO, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, first side surface of protective glass S13, second side surface of protective glass S14, and imaging surface IMA.

[0241] The first lens L1 has positive optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is convex, and its second side surface S4 is concave. The third lens L3 has negative optical power, its first side surface S6 is concave, and its second side surface S7 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 positive optical power, its first side surface S9 is convex, and its second side surface S10 is convex. The sixth lens L6 has positive optical power, its first side surface S11 is convex, and its second side surface S12 is convex. Light from the first side passes sequentially through surfaces S1 to S14 and is finally imaged onto the imaging plane IMA. Since the third lens L3 and the fourth lens L4 are cemented together to form a cemented doublet lens, the second side surface S7 of the third lens and the first side surface S7 of the fourth lens are the same surface.

[0242] In this example, the total effective focal length F of the optical lens is 21.354mm, the maximum field of view (FOV) of the optical lens is 32.910°, and the total length (TTL) of the optical lens is 60.810mm.

[0243] Table 8 shows the basic structural parameters of the optical lens of Example 8, where the units for radius of curvature (Radius) and thickness (Thickness / Distance) are millimeters (mm).

[0244] 1 16.500 3.453 1.72 37.99 2 53.527 0.103 3 14.000 6.100 1.73 28.32 4 5.270 4.180 STO Infinity 4.700 6 -15.620 2.400 1.78 25.72 7 -140.101 4.555 1.50 81.61 8 -9.530 0.100 9 175.000 4.100 1.50 81.61 10 -21.800 0.100 11 56.000 3.270 1.77 49.61 12 -78.500 26.450 13 Infinity 1.100 1.51 62.91 14 Infinity 0.310 IMA / /

[0245] Table 8

[0246] In Example 8, none of the surfaces of the first lens L1 to the sixth lens L6 are aspherical.

[0247] In summary, Examples 1 through 8 satisfy the relationships shown in Table 9.

[0248]

[0249]

[0250] Table 9

[0251] Table 10 gives the effective focal length F of the optical lenses for Examples 1 to 8, and the effective focal lengths of each lens from F1 to F6, etc. (unit: mm).

[0252]

[0253]

[0254] Table 10

[0255] 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.

[0256] 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.

[0257] 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.

[0258] 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, From the first side to the second side, the following are included in sequence: A first lens with positive 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 first side of the second lens is convex and the second side is concave; A third lens with negative optical power; A fourth lens with positive optical power, wherein the second side surface of the fourth lens is convex; A fifth lens with positive optical power, wherein the second side surface of the fifth lens is convex; A sixth lens with positive optical power, wherein the first side surface of the sixth lens is convex; The optical lens contains a total of six lenses with optical power. The total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging plane of the optical lens, satisfies the following relationship with the total focal length F of the optical lens: 2.2≤TTL / F≤3.108; the image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian value θ of the maximum field of view of the optical lens satisfy the following relationship: 0.034≤|(HF*θ) / (F*θ)|≤0.

072.

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

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

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

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

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 fifth lens is concave.

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

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

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

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

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

13. The optical lens according to any one of claims 1 to 12, characterized in that, The maximum aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy the following condition: 0.02≤D / H / FOV≤0.

09.

14. The optical lens according to any one of claims 1 to 12, characterized in that, The total focal length F of the optical lens, the entrance pupil diameter ENPD of the optical lens, and the maximum effective aperture D of the first side surface of the first lens corresponding to the maximum field of view of the optical lens satisfy the following condition: 0.055≤F / ENPD / D≤0.

21.

15. The optical lens according to any one of claims 1 to 12, 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 imaging plane, and the optical total length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging plane of the optical lens, satisfy the following condition: 0.08 ≤ BFL / TTL ≤ 0.

98.

16. The optical lens according to any one of claims 1 to 12, 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 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 to the center of the second side of the last lens, satisfy the following condition: 0.18≤BFL / TL≤4.

1.

17. The optical lens according to any one of claims 1 to 12, characterized in that, The total focal length F of the optical lens and the image height H corresponding to the maximum field of view of the optical lens satisfy the following condition: 0.75≤F / H≤5.

3.

18. The optical lens according to any one of claims 1 to 12, characterized in that, The image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian value θ of the maximum field of view of the optical lens satisfy the following condition: 0.001≤(H / 2) / (F*tan(θ / 2))≤3.

2.

19. The optical lens according to any one of claims 1 to 12, characterized in that, The combined focal length F of the third lens, the fourth lens, the fifth lens, and the sixth lens （3-6） The radius of curvature R1 of the first side surface of the first lens and the radius of curvature R2 of the second side surface of the first lens satisfy the following condition: 0.005 ≤ |F （3-6） / (R1+R2)|≤0.

53.

20. The optical lens according to any one of claims 1 to 12, characterized in that, The radius of curvature R3 of the first side surface of the second lens, the radius of curvature R6 of the first side surface of the third lens, the distance d4 between the second side surface of the second lens and the aperture stop, and the distance d5 between the first side surface of the third lens and the aperture stop satisfy the following condition: 0.001≤(d4+d5) / (R3+|R6|)≤0.

76.

21. The optical lens according to any one of claims 1 to 12, characterized in that, The distance d from the aperture to the chip （5-14） 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 imaging plane, satisfies: 1.08 ≤ d （5-14） / (d （5-14） -BFL)≤7.

3.

22. The optical lens according to any one of claims 1 to 12, characterized in that, The distance d4 between the second side surface of the second lens and the aperture stop and the distance d5 between the first side surface of the third lens and the aperture stop satisfy the following condition: 3.3≤d4+d5≤15.

4.

23. The optical lens according to any one of claims 1 to 12, characterized in that, The aperture D11 of the first side of the sixth lens, the distance L from the aperture stop to the imaging plane, and the optical back focal length of the optical lens, i.e., the distance BFL from the center of the second side of the last lens of the optical lens to the center of the imaging plane, satisfy the following condition: 6.4≤D11*BFL / L≤16.

2.

24. The optical lens according to any one of claims 1 to 12, characterized in that, The total focal length F of the optical lens and the exit pupil position EXPP of the optical lens satisfy the following condition: 0.095≤|F / EXPP|≤0.

9.

25. The optical lens according to any one of claims 1 to 12, characterized in that, The radius of curvature R3 of the first side surface of the second lens and the radius of curvature R4 of the second side surface of the second lens satisfy the following condition: 0.272≤(R3-R4) / (R3+R4)≤0.

76.

26. The optical lens according to any one of claims 1 to 12, characterized in that, The refractive index Nd2 of the second lens, the radius of curvature R3 of the first side surface of the second lens, the radius of curvature R4 of the second side surface of the second lens, and the thickness d3 of the second lens satisfy the following condition: -0.062≤(Nd2-1)*(1 / R3-1 / R4)+(Nd2-1)²*d3 / (Nd2*R3*R4)≤-0.

03.

27. The optical lens according to any one of claims 1 to 12, characterized in that, The sag3 of the first side of the second lens and the sag4 of the image side of the second lens satisfy the following condition: 0.03≤|sag3 / sag4|≤5.

1.

28. The optical lens according to any one of claims 1 to 12, characterized in that, The total focal length F of the optical lens, the radius of curvature R1 of the first side surface of the first lens, and the radius of curvature R2 of the second side surface of the first lens satisfy the following condition: 0.05≤|F / R1|+|F / R2|≤3.

5.

29. The optical lens according to any one of claims 1 to 12, characterized in that, The optical lens satisfies at least one of the following conditions: The total optical length of the optical lens, i.e. the distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging plane of the optical lens, satisfies the following condition with respect to the total focal length F of the optical lens: 2.8417≤TTL / F≤3.

108. The maximum aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy the following condition: 0.039≤D / H / FOV≤0.050; The total focal length F of the optical lens, the entrance pupil diameter ENPD of the optical lens, and the maximum effective aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens satisfy the following condition: 0.123≤F / ENPD / D≤0.

150. The image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian value θ of the maximum field of view of the optical lens satisfy the following condition: 0.034≤|(HF*θ) / (F*θ)|≤0.049; 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 imaging plane, and the optical total length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging plane of the optical lens, satisfy the following condition: 0.403≤BFL / TTL≤0.

458. 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 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 to the center of the second side of the last lens, satisfy the following condition: 0.675≤BFL / TL≤0.

846. The total focal length F of the optical lens and the image height H corresponding to the maximum field of view of the optical lens satisfy the following relationship: 1.630≤F / H≤1.741; The image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian value θ of the maximum field of view of the optical lens satisfy the following condition: 1.007≤(H / 2) / (F*tan(θ / 2))≤1.020; The combined focal length F of the third lens, the fourth lens, the fifth lens, and the sixth lens （3-6） The radius of curvature R1 of the first side surface of the first lens and the radius of curvature R2 of the second side surface of the first lens satisfy the following condition: 0.196 ≤ |F （3-6） / (R1+R2)|≤0.293; The radius of curvature R3 of the first side surface of the second lens, the radius of curvature R6 of the first side surface of the third lens, the distance d4 between the second side surface of the second lens and the aperture stop, and the distance d5 between the first side surface of the third lens and the aperture stop satisfy the following condition: 0.043≤(d4+d5) / (R3+|R6|)≤0.263; The distance d from the aperture to the chip （5-14） 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 image plane, satisfies: 2.202 ≤ d （5-14） / (d （5-14） -BFL)≤2.493; The distance d4 between the second side surface of the second lens and the aperture stop and the distance d5 between the first side surface of the third lens and the aperture stop satisfy the following condition: 7.957 ≤ d4 + d5 ≤ 10.470; The aperture D11 of the first side of the sixth lens, the distance L from the aperture stop to the imaging plane, and the optical back focal length of the optical lens, i.e. the distance BFL from the center of the second side of the last lens of the optical lens to the center of the imaging plane, satisfy the following condition: 10.171≤D11*BFL / L≤11.

152. The total focal length F of the optical lens and the exit pupil position EXPP of the optical lens satisfy the following condition: 0.139≤|F / EXPP|≤0.161; The radius of curvature R3 of the first side surface of the second lens and the radius of curvature R4 of the second side surface of the second lens satisfy the following condition: 0.397≤(R3-R4) / (R3+R4)≤0.490; The refractive index Nd2 of the second lens, the radius of curvature R3 of the first side surface of the second lens, the radius of curvature R4 of the second side surface of the second lens, and the thickness d3 of the second lens satisfy the following condition: -0.062≤(Nd2-1)*(1 / R3-1 / R4)+(Nd2-1)²*d3 / (Nd2*R3*R4)≤-0.058; The sag3 of the first side of the second lens and the sag4 of the image side of the second lens satisfy the following condition: 1.032≤|sag3 / sag4|≤1.312; The total focal length F of the optical lens, the radius of curvature R1 of the first side surface of the first lens, and the radius of curvature R2 of the second side surface of the first lens satisfy the following condition: 1.653≤|F / R1|+|F / R2|≤1.

991.

30. The optical lens according to any one of claims 1 to 12, characterized in that, The refractive index Nd2 of the second lens, the radius of curvature R3 of the first side surface of the second lens, the radius of curvature R4 of the second side surface of the second lens, and the thickness d3 of the second lens satisfy the following condition: -0.07≤(Nd2-1)*(1 / R3-1 / R4)+(Nd2-1)²*d3 / (Nd2*R3*R4)≤-0.

03.

31. The optical lens according to any one of claims 1 to 12, characterized in that, The optical lens satisfies at least one of the following conditions: The image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian value θ of the maximum field of view of the optical lens satisfy the following: 1.007≤(H / 2) / (F*tan(θ / 2))≤2.1; The total focal length F of the optical lens, the radius of curvature R1 of the first side surface of the first lens, and the radius of curvature R2 of the second side surface of the first lens satisfy the following condition: 1.653≤|F / R1|+|F / R2|≤3.5; The total focal length F of the optical lens, the entrance pupil diameter ENPD of the optical lens, and the maximum effective aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens satisfy the following condition: 0.08≤F / ENPD / D≤0.

18. The aperture D11 of the first side of the sixth lens, the distance L from the aperture stop to the imaging plane, and the optical back focal length of the optical lens, i.e. the distance BFL from the center of the second side of the last lens of the optical lens to the center of the imaging plane, satisfy the following condition: 8.1≤D11*BFL / L≤13.

3. The total focal length F of the optical lens and the exit pupil position EXPP of the optical lens satisfy the following condition: 0.11≤|F / EXPP|≤0.54; The sag3 of the first side surface of the second lens and the sag4 of the image side surface of the second lens satisfy the following condition: 0.003≤|sag3 / sag4|≤2.

9.

32. An optical lens, characterized in that, From the first side to the second side, the following are included in sequence: A first lens with positive optical power; A second lens with negative optical power; A third lens with negative optical power; A fourth lens with positive optical power; A fifth lens with positive optical power; A sixth lens with positive optical power; Wherein, 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 imaging plane of the optical lens, satisfies the following relationship with the total focal length F of the optical lens: 2.2≤TTL / F≤3.108; the image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian value θ of the maximum field of view of the optical lens satisfy the following relationship: 0.034≤|(HF*θ) / (F*θ)|≤0.

072.

33. The optical lens according to claim 32, characterized in that, The first side of the first lens is convex, and the second side is concave.

34. The optical lens according to claim 32, characterized in that, The first side of the second lens is convex, and the second side is concave.

35. The optical lens according to claim 32, characterized in that, The first side of the third lens is concave, and the second side is convex.

36. The optical lens according to claim 32, characterized in that, The first side surface of the third lens is concave, and the second side surface is concave.

37. The optical lens according to claim 32, characterized in that, The first side of the third lens is convex, and the second side is concave.

38. The optical lens according to claim 32, characterized in that, The first side surface of the fourth lens is convex, and the second side surface is convex.

39. The optical lens according to claim 32, characterized in that, The first side of the fourth lens is concave, and the second side is convex.

40. The optical lens according to claim 32, characterized in that, The first side of the fifth lens is concave, and the second side is convex.

41. The optical lens according to claim 32, characterized in that, The first side surface of the fifth lens is convex, and the second side surface is convex.

42. The optical lens according to claim 32, characterized in that, The first side surface of the sixth lens is convex, and the second side surface is convex.

43. The optical lens according to claim 32, characterized in that, The first side of the sixth lens is convex, and the second side is concave.

44. The optical lens according to claim 32, characterized in that, The third lens and the fourth lens are cemented together to form a cemented doublet lens.

45. The optical lens according to claim 32, characterized in that, The optical lens also includes an aperture stop, which is disposed between the second lens and the third lens.

46. ​​The optical lens according to any one of claims 32 to 45, characterized in that, The refractive index Nd2 of the second lens, the radius of curvature R3 of the first side surface of the second lens, the radius of curvature R4 of the second side surface of the second lens, and the thickness d3 of the second lens satisfy the following condition: -0.062≤(Nd2-1)*(1 / R3-1 / R4)+(Nd2-1)²*d3 / (Nd2*R3*R4)≤-0.

03.

47. The optical lens according to any one of claims 32 to 45, characterized in that, The maximum aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy the following condition: 0.02≤D / H / FOV≤0.

09.

48. The optical lens according to any one of claims 32 to 45, characterized in that, The total focal length F of the optical lens, the entrance pupil diameter ENPD of the optical lens, and the maximum effective aperture D of the first side surface of the first lens corresponding to the maximum field of view of the optical lens satisfy the following condition: 0.055≤F / ENPD / D≤0.

21.

49. The optical lens according to any one of claims 32 to 45, 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 imaging plane, and the optical total length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging plane of the optical lens, satisfy the following condition: 0.08 ≤ BFL / TTL ≤ 0.

98.

50. The optical lens according to any one of claims 32 to 45, 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 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 to the center of the second side of the last lens, satisfy the following condition: 0.18≤BFL / TL≤4.

1.

51. The optical lens according to any one of claims 32 to 45, characterized in that, The total focal length F of the optical lens and the image height H corresponding to the maximum field of view of the optical lens satisfy the following condition: 0.75≤F / H≤5.

3.

52. The optical lens according to any one of claims 32 to 45, characterized in that, The image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian value θ of the maximum field of view of the optical lens satisfy the following condition: 0.001≤(H / 2) / (F*tan(θ / 2))≤3.

2.

53. The optical lens according to any one of claims 32 to 45, characterized in that, The combined focal length F of the third lens, the fourth lens, the fifth lens, and the sixth lens （3-6） The radius of curvature R1 of the first side surface of the first lens and the radius of curvature R2 of the second side surface of the first lens satisfy the following condition: 0.005 ≤ |F （3-6） / (R1+R2)|≤0.

53.

54. The optical lens according to any one of claims 32 to 45, characterized in that, The radius of curvature R3 of the first side surface of the second lens, the radius of curvature R6 of the first side surface of the third lens, the distance d4 between the second side surface of the second lens and the aperture stop, and the distance d5 between the first side surface of the third lens and the aperture stop satisfy the following condition: 0.001≤(d4+d5) / (R3+|R6|)≤0.

76.

55. The optical lens according to any one of claims 32 to 45, characterized in that, The distance d from the aperture to the chip （5-14） 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 imaging plane, satisfies: 1.08 ≤ d （5-14） / (d （5-14） -BFL)≤7.

3.

56. The optical lens according to any one of claims 32 to 45, characterized in that, The distance d4 between the second side surface of the second lens and the aperture stop and the distance d5 between the first side surface of the third lens and the aperture stop satisfy the following condition: 3.3≤d4+d5≤15.

4.

57. The optical lens according to any one of claims 32 to 45, characterized in that, The aperture D11 of the first side of the sixth lens, the distance L from the aperture stop to the imaging plane, and the optical back focal length of the optical lens, i.e., the distance BFL from the center of the second side of the last lens of the optical lens to the center of the imaging plane, satisfy the following condition: 6.4≤D11*BFL / L≤16.

2.

58. The optical lens according to any one of claims 32 to 45, characterized in that, The total focal length F of the optical lens and the exit pupil position EXPP of the optical lens satisfy the following condition: 0.095≤|F / EXPP|≤0.

9.

59. The optical lens according to any one of claims 32 to 45, characterized in that, The radius of curvature R3 of the first side surface of the second lens and the radius of curvature R4 of the second side surface of the second lens satisfy the following condition: 0.272≤(R3-R4) / (R3+R4)≤0.

76.

60. The optical lens according to any one of claims 32 to 45, characterized in that, The sag3 of the first side of the second lens and the sag4 of the image side of the second lens satisfy the following condition: 0.03≤|sag3 / sag4|≤5.

1.

61. The optical lens according to any one of claims 32 to 45, characterized in that, The total focal length F of the optical lens, the radius of curvature R1 of the first side surface of the first lens, and the radius of curvature R2 of the second side surface of the first lens satisfy the following condition: 0.05≤|F / R1|+|F / R2|≤3.

5.

62. The optical lens according to any one of claims 32 to 45, characterized in that, The optical lens satisfies at least one of the following conditions: The total optical length of the optical lens, i.e. the distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging plane of the optical lens, satisfies the following condition with respect to the total focal length F of the optical lens: 2.8417≤TTL / F≤3.

108. The maximum aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy the following condition: 0.039≤D / H / FOV≤0.050; The total focal length F of the optical lens, the entrance pupil diameter ENPD of the optical lens, and the maximum effective aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens satisfy the following condition: 0.123≤F / ENPD / D≤0.

150. The image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian value θ of the maximum field of view of the optical lens satisfy the following condition: 0.034≤|(HF*θ) / (F*θ)|≤0.049; 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 imaging plane, and the optical total length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging plane of the optical lens, satisfy the following condition: 0.403≤BFL / TTL≤0.

458. 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 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 to the center of the second side of the last lens, satisfy the following condition: 0.675≤BFL / TL≤0.

846. The total focal length F of the optical lens and the image height H corresponding to the maximum field of view of the optical lens satisfy the following relationship: 1.630≤F / H≤1.741; The image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian value θ of the maximum field of view of the optical lens satisfy the following condition: 1.007≤(H / 2) / (F*tan(θ / 2))≤1.020; The combined focal length F of the third lens, the fourth lens, the fifth lens, and the sixth lens （3-6） The radius of curvature R1 of the first side surface of the first lens and the radius of curvature R2 of the second side surface of the first lens satisfy the following condition: 0.196 ≤ |F （3-6） / (R1+R2)|≤0.293; The radius of curvature R3 of the first side surface of the second lens, the radius of curvature R6 of the first side surface of the third lens, the distance d4 between the second side surface of the second lens and the aperture stop, and the distance d5 between the first side surface of the third lens and the aperture stop satisfy the following condition: 0.043≤(d4+d5) / (R3+|R6|)≤0.263; The distance d from the aperture to the chip （5-14） 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 image plane, satisfies: 2.202 ≤ d （5-14） / (d （5-14） -BFL)≤2.493; The distance d4 between the second side surface of the second lens and the aperture stop and the distance d5 between the first side surface of the third lens and the aperture stop satisfy the following condition: 7.957 ≤ d4 + d5 ≤ 10.470; The aperture D11 of the first side of the sixth lens, the distance L from the aperture stop to the imaging plane, and the optical back focal length of the optical lens, i.e. the distance BFL from the center of the second side of the last lens of the optical lens to the center of the imaging plane, satisfy the following condition: 10.171≤D11*BFL / L≤11.

152. The total focal length F of the optical lens and the exit pupil position EXPP of the optical lens satisfy the following condition: 0.139≤|F / EXPP|≤0.161; The radius of curvature R3 of the first side surface of the second lens and the radius of curvature R4 of the second side surface of the second lens satisfy the following condition: 0.397≤(R3-R4) / (R3+R4)≤0.490; The refractive index Nd2 of the second lens, the radius of curvature R3 of the first side surface of the second lens, the radius of curvature R4 of the second side surface of the second lens, and the thickness d3 of the second lens satisfy the following condition: -0.062≤(Nd2-1)*(1 / R3-1 / R4)+(Nd2-1)²*d3 / (Nd2*R3*R4)≤-0.058; The sag3 of the first side of the second lens and the sag4 of the image side of the second lens satisfy the following condition: 1.032≤|sag3 / sag4|≤1.312; The total focal length F of the optical lens, the radius of curvature R1 of the first side surface of the first lens, and the radius of curvature R2 of the second side surface of the first lens satisfy the following condition: 1.653≤|F / R1|+|F / R2|≤1.

991.

63. The optical lens according to any one of claims 32 to 45, characterized in that, The refractive index Nd2 of the second lens, the radius of curvature R3 of the first side surface of the second lens, the radius of curvature R4 of the second side surface of the second lens, and the thickness d3 of the second lens satisfy the following condition: -0.07≤(Nd2-1)*(1 / R3-1 / R4)+(Nd2-1)²*d3 / (Nd2*R3*R4)≤-0.

03.

64. The optical lens according to any one of claims 32 to 45, characterized in that, The optical lens satisfies at least one of the following conditions: The image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian value θ of the maximum field of view of the optical lens satisfy the following: 1.007≤(H / 2) / (F*tan(θ / 2))≤2.1; The total focal length F of the optical lens, the radius of curvature R1 of the first side surface of the first lens, and the radius of curvature R2 of the second side surface of the first lens satisfy the following condition: 1.653≤|F / R1|+|F / R2|≤3.5; The total focal length F of the optical lens, the entrance pupil diameter ENPD of the optical lens, and the maximum effective aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens satisfy the following condition: 0.08≤F / ENPD / D≤0.

18. The aperture D11 of the first side of the sixth lens, the distance L from the aperture stop to the imaging plane, and the optical back focal length of the optical lens, i.e. the distance BFL from the center of the second side of the last lens of the optical lens to the center of the imaging plane, satisfy the following condition: 8.1≤D11*BFL / L≤13.

3. The total focal length F of the optical lens and the exit pupil position EXPP of the optical lens satisfy the following condition: 0.11≤|F / EXPP|≤0.54; The sag3 of the first side surface of the second lens and the sag4 of the image side surface of the second lens satisfy the following condition: 0.003≤|sag3 / sag4|≤2.

9.

65. An electronic device, characterized in that, It includes an optical lens according to any one of claims 1 to 64 and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

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