Optical lens and electronic device

Abstract

The application provides an optical lens and an electronic device. The optical lens comprises, in sequence from a first side to a second side: a first lens with negative focal power, the first side of the first lens being a convex surface and the second side being a concave surface; a second lens with negative focal power, the first side of the second lens being a concave surface; a third lens with positive focal power, the second side of the third lens being a convex surface; a fourth lens with positive focal power, the second side of the fourth lens being a convex surface; a fifth lens with negative focal power, the second side of the fifth lens being a concave surface; and a sixth lens with positive focal power, the first side of the sixth lens being a convex surface and the second side being a convex surface. The application solves the problem that the optical lens in the prior art cannot simultaneously achieve miniaturization, high illumination and high resolution.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical imaging devices, in particular to an optical lens and an electronic device. BACKGROUND

[0002] In recent years, with the development of science and technology, the demand for optical lenses in daily life is increasing, and optical lenses are also applied to more and more scenes. For example, in the automobile driving industry, in order to ensure driving safety, it is necessary to more accurately detect the driving environment, and the optical lens becomes a key device for detecting information around the car.

[0003] With the rapid development of automatic driving auxiliary systems for cars, the number of optical lenses used on cars is gradually increasing. At present, the surround-view optical lens is a key component for automatic driving auxiliary systems to obtain external information. With the increasing market demand, the requirements for surround-view car lenses are becoming higher and higher, and are developing towards high resolution, high illumination and miniaturization. In order to meet the requirements of safe driving and special installation positions, compared with ordinary optical lenses, car lenses in automatic driving auxiliary systems have more special requirements.

[0004] That is, the optical lens in the prior art has the problem that miniaturization, high illumination and high resolution cannot be considered simultaneously. SUMMARY

[0005] The main purpose of the present application is to provide an optical lens and an electronic device to solve the problem that the optical lens in the prior art cannot simultaneously consider miniaturization, high illumination and high resolution.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present application, an optical lens is provided, which comprises, in order from a first side to a second side: a first lens having a negative focal length, the first side of the first lens being a convex surface and the second side being a concave surface; a second lens having a negative focal length, the first side of the second lens being a concave surface; a third lens having a positive focal length, the second side of the third lens being a convex surface; a fourth lens having a positive focal length, the second side of the fourth lens being a convex surface; a fifth lens having a negative focal length, the second side of the fifth lens being a concave surface; and a sixth lens having a positive focal length, the first side of the sixth lens being a convex surface and the second side being a convex surface.

[0007] Further, the second side of the second lens is a concave surface.

[0008] Further, the second side of the second lens is a convex surface.

[0009] Further, the first side of the third lens is a concave surface.

[0010] Further, the first side of the third lens is a convex surface.

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

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

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

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

[0015] Furthermore, the fifth lens and the sixth lens are cemented together to form a cemented doublet lens.

[0016] Furthermore, the second, third, fifth, and sixth lenses are all aspherical lenses.

[0017] Furthermore, the second lens and / or the fifth lens are configured to be inverted.

[0018] Furthermore, the optical lens also includes an aperture stop, which is positioned between the third lens and the fourth lens; or the aperture stop is positioned between the fourth lens and the fifth lens.

[0019] Furthermore, the radius of curvature R3 of the first side of the second lens satisfies the following relationship with the total focal length F of the optical lens: R3 / F≤-0.001.

[0020] Furthermore, the radius of curvature R3 of the first side surface of the second lens and the radius of curvature R2 of the second side surface of the first lens satisfy the following condition: R3 / R2≤-0.001.

[0021] 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: TTL / F≤9.5.

[0022] Furthermore, the maximum effective aperture D1 of the first side of the first lens corresponding to the maximum field of view of the optical lens and the maximum effective aperture D12 of the second side of the sixth lens corresponding to the maximum field of view of the optical lens satisfy the following condition: D1 / D12≤3.5.

[0023] Furthermore, on one imaging plane of the optical lens, the relative illumination at the maximum image height, RI, satisfies the following relationship with the maximum field of view (FOV) of the optical lens: 85 ≤ RI * FOV.

[0024] Furthermore, the Abbe number Vd2 of the second lens and the Abbe number Vd3 of the third lens satisfy the following condition: 0.1 ≤ Vd2 / Vd3 ≤ 4.

[0025] Further, a focal length value F56 of the doublet lens formed by the fifth lens and the sixth lens satisfies F56 / F≤20.

[0026] Further, an optical total track length of the optical lens, i.e., a center distance TTL from a first side center of the first lens of the optical lens to an imaging surface of the optical lens and an air gap d4 between the second lens and the third lens satisfy 4.5≤TTL / d4≤25.

[0027] Further, a curvature radius R11 of the first side surface of the sixth lens and a curvature radius R12 of the second side surface of the sixth lens satisfy 0.05≤|(R11+R12) / (R11-R12)|≤2.

[0028] Further, a curvature radius R5 of the first side surface of the third lens and a curvature radius R6 of the second side surface of the third lens satisfy R5 / R6≤15.

[0029] Further, a focal length F3 of the third lens satisfies F3 / F≤15.

[0030] Further, a maximum field of view FOV of the optical lens, a focal length F of the optical lens as a whole, and an image height H corresponding to the maximum field of view of the optical lens satisfy 48≤(FOV×F) / H.

[0031] Further, a sagittal height SAG3 of the first side surface of the second lens and a sagittal height SAG4 of the second side surface of the second lens satisfy -20≤SAG4 / SAG3≤35.

[0032] Further, a focal length F1 of the first lens and a focal length F2 of the second lens satisfy F1 / F2≤5.

[0033] Further, a maximum effective entrance pupil D1 of the first side surface of the first lens corresponding to the maximum field of view of the optical lens and a focal length F of the optical lens as a whole satisfy D1 / F≤8.

[0034] Further, an optical total track length of the optical lens, i.e., a center distance TTL from a first side center of the first lens of the optical lens to an imaging surface of the optical lens and an optical back focal length BFL of the optical lens, i.e., a center distance from a second side center of the last lens of the optical lens to the imaging surface satisfy BFL / TTL≥0.1.

[0035] Further, an optical total track length of the optical lens, i.e., a center distance TTL from a first side center of the first lens of the optical lens to an imaging surface of the optical lens, an image height H corresponding to the maximum field of view of the optical lens, and an arc value θ corresponding to the maximum field of view of the optical lens satisfy TTL / H / θ≤2.

[0036] Further, an optical total track length of the optical lens, i.e. a distance TTL from a first side center of the first lens of the optical lens to a center of an imaging surface of the optical lens and a distance L from the stop to the imaging surface satisfy: TTL / L≤3.5.

[0037] Further, a maximum effective aperture D1 of the first side surface of the first lens corresponding to a maximum field of view angle of the optical lens and the distance L from the stop to the imaging surface satisfy: D1 / L≤2.2.

[0038] Further, a center thickness d10 of the fifth lens, a center thickness d11 of the sixth lens and the optical total track length of the optical lens, i.e. the distance TTL from the first side center of the first lens of the optical lens to the center of the imaging surface of the optical lens satisfy: (d10+d11) / TTL≤0.4.

[0039] According to another aspect of the present application, there is provided an optical lens comprising, in order from a first side to a second side: a first lens having negative refractive power; a second lens having negative refractive power; a third lens having positive refractive power; a fourth lens having positive refractive power; a fifth lens having negative refractive power; a sixth lens having positive refractive power; wherein a radius of curvature R3 of a first side surface of the second lens and an overall focal length value F of the optical lens satisfy: R3 / F≤-0.001.

[0040] Further, the first side surface of the first lens is convex and the second side surface is concave.

[0041] Further, the first side surface of the second lens is concave and the second side surface is concave.

[0042] Further, the first side surface of the second lens is concave and the second side surface is convex.

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

[0044] Further, the first side surface of the third lens is convex and the second side surface is convex.

[0045] Further, the first side surface of the fourth lens is convex and the second side surface is convex.

[0046] Further, the first side surface of the fourth lens is concave and the second side surface is convex.

[0047] Further, the first side surface of the fifth lens is concave and the second side surface is concave.

[0048] Further, the first side surface of the fifth lens is convex and the second side surface is concave.

[0049] Further, the first side surface of the sixth lens is a convex surface, and the second side surface is a convex surface.

[0050] Further, the fifth lens and the sixth lens are cemented to form a double cemented lens.

[0051] Further, the second lens, the third lens, the fifth lens and the sixth lens are all aspherical lenses.

[0052] Further, the second lens and / or the fifth lens is provided with a reverse curve.

[0053] Further, the optical lens further comprises a diaphragm, which is arranged between the third lens and the fourth lens, or arranged between the fourth lens and the fifth lens.

[0054] Further, the radius of curvature R3 of the first side surface of the second lens and the radius of curvature R2 of the second side surface of the first lens satisfy: R3 / R2≤-0.001.

[0055] Further, the total optical length of the optical lens, i.e. the center distance TTL from the first side center of the first lens of the optical lens to the imaging surface of the optical lens, and the total focal length F of the optical lens satisfy: TTL / F≤9.5.

[0056] Further, the maximum effective aperture D1 of the first side surface of the first lens corresponding to the maximum field of view of the optical lens and the maximum effective aperture D12 of the second side surface of the sixth lens corresponding to the maximum field of view of the optical lens satisfy: D1 / D12≤3.5.

[0057] Further, the relative illumination RI at the maximum image height on the imaging surface of the optical lens and the maximum field of view FOV of the optical lens satisfy: 85≤RI*FOV.

[0058] Further, the Abbe number Vd2 of the second lens and the Abbe number Vd3 of the third lens satisfy: 0.1≤Vd2 / Vd3≤4.

[0059] Further, the focal length F56 of the double cemented lens formed by the fifth lens and the sixth lens and the total focal length F of the optical lens satisfy: F56 / F≤20.

[0060] Further, the total optical length of the optical lens, i.e. the center distance TTL from the first side center of the first lens of the optical lens to the imaging surface of the optical lens, and the air gap d4 between the second lens and the third lens satisfy: 4.5≤TTL / d4≤25.

[0061] Further, a radius of curvature R11 of the first side surface of the sixth lens and a radius of curvature R12 of the second side surface of the sixth lens satisfy: 0.05≤|(R11+R12) / (R11-R12)|≤2.

[0062] Further, a radius of curvature R5 of the first side surface of the third lens and a radius of curvature R6 of the second side surface of the third lens satisfy: R5 / R6≤15.

[0063] Further, a focal length F3 of the third lens and a total track length value F of the optical lens satisfy: F3 / F≤15.

[0064] Further, a maximum field of view FOV of the optical lens, a total track length value F of the optical lens, and an image height H corresponding to the maximum field of view of the optical lens satisfy: 48≤(FOV×F) / H.

[0065] Further, a sagittal height SAG3 of the first side surface of the second lens and a sagittal height SAG4 of the second side surface of the second lens satisfy: -20≤SAG4 / SAG3≤35.

[0066] Further, a focal length F1 of the first lens and a focal length F2 of the second lens satisfy: F1 / F2≤5.

[0067] Further, a maximum effective aperture D1 of the first side surface of the first lens corresponding to the maximum field of view of the optical lens and a total track length value F of the optical lens satisfy: D1 / F≤8.

[0068] Further, an optical total length of the optical lens, i.e., a center distance TTL from the first side center of the first lens of the optical lens to the center of the imaging surface of the optical lens and an optical back focal length BFL of the optical lens, i.e., a center distance from the second side center of the last lens of the optical lens to the center of the imaging surface satisfy: BFL / TTL≥0.1.

[0069] Further, an optical total length of the optical lens, i.e., a center distance TTL from the first side center of the first lens of the optical lens to the center of the imaging surface of the optical lens, an image height H corresponding to the maximum field of view of the optical lens, and an arc value θ corresponding to the maximum field of view of the optical lens satisfy: TTL / H / θ≤2.

[0070] Further, an optical total length of the optical lens, i.e., a center distance TTL from the first side center of the first lens of the optical lens to the center of the imaging surface of the optical lens and a distance L from the stop to the imaging surface satisfy: TTL / L≤3.5.

[0071] Further, a maximum effective aperture D1 of the first side surface of the first lens corresponding to the maximum field of view of the optical lens and a distance L from the stop to the imaging surface satisfy: D1 / L≤2.2.

[0072] Further, the center thickness d10 of the fifth lens, the center thickness d11 of the sixth lens and the total optical length of the optical lens, i.e. the center distance TTL from the first side of the first lens of the optical lens to the imaging surface of the optical lens satisfy: (d10+d11) / TTL≤0.4.

[0073] According to another aspect of the present application, an electronic device is provided, which comprises the optical lens and an imaging element for converting the optical image formed by the optical lens into an electrical signal.

[0074] According to the technical solution of the present application, the optical lens comprises, in sequence from the first side to the second side, a first lens with negative focal length, a second lens with negative focal length, a third lens with positive focal length, a fourth lens with positive focal length, a fifth lens with negative focal length and a sixth lens with positive focal length, the first side of the first lens is convex, and the second side is concave; the first side of the second lens is concave; the second side of the third lens is convex; the second side of the fourth lens is convex; the second side of the fifth lens is concave; the first side of the sixth lens is convex, and the second side is convex.

[0075] The first lens has negative focal length, the first side of the first lens is convex, and the second side is concave. The first lens is designed to be a meniscus shape to collect as much light as possible in a large field of view and enter the rear optical system to increase the light flux; the first lens is designed to have negative focal length to diverge the light, smoothly transition the light path, and make the light in a large angle enter as much as possible to improve the illumination and facilitate the reduction of the light path in the rear to achieve a short TTL and increase the light flux.

[0076] The second lens has negative focal length and has a diverging effect on the light, which can disperse the central light and the edge light in each field of view; the first side of the second lens is concave, which helps to better receive the light from the second side of the first lens and balance the divergence of the light in each field of view, so that the light path of the optical lens is smoother, which helps the rear optical system to better receive and converge the edge light and improve the illumination of the edge field of view; the second side of the second lens can be convex or concave, when the second side of the second lens is concave, the outgoing light is smoother, the loss of edge light energy is reduced, and the edge illumination is further improved; preferably, the second lens is an aspherical lens, which is conducive to better improving the resolution; when the second side of the second lens is convex, the second side of the second lens has a reverse curvature structure with a convex center and a concave edge, which is conducive to better balancing the aberration of the center and the edge and improving the resolution.

[0077] The third lens has positive refractive power, the first side of the third lens can be concave or convex, and the second side of the third lens is convex. When the first side of the third lens is concave, the third lens is preferably an aspheric lens and has positive refractive power, converges light, balances the near-axis aberration and off-axis astigmatism, and the concave first side of the third lens helps the light to transition to the fourth lens better, converges the light of each field of view better, and is beneficial to improving the overall resolution and reducing the overall size of the optical lens.

[0078] The fourth lens has positive refractive power, the first side of the fourth lens can be convex or concave, and the second side of the fourth lens is convex. When the first side of the fourth lens is convex, the fourth lens has positive refractive power and is biconvex, converges light, and converges and collects the light of the front optical system. When the first side of the fourth lens is concave, the fourth lens has positive refractive power, and the concave first side of the fourth lens is matched with the convex second side of the third lens, which is beneficial to the smooth transition of light.

[0079] The fifth lens has negative refractive power and diverges light, the first side of the fifth lens can be concave or convex, and the second side of the fifth lens is concave. The first side of the fifth lens can be concave or convex, which is beneficial to the smooth transition of light to the sixth lens and ensures the stability of imaging. The second side of the fifth lens is concave, which is beneficial to the cooperation with the first side of the sixth lens, matches the sixth lens, corrects various aberrations in the system, improves the resolution, and optimizes the optical performance such as distortion and CRA under the premise of compact structure.

[0080] The sixth lens has positive refractive power, which is beneficial to the smooth convergence of light to the imaging surface. The first side of the sixth lens is convex, and the second side of the sixth lens is convex. This is beneficial to the cooperation with the fifth lens, corrects various aberrations in the system, improves the resolution, and optimizes the optical performance such as distortion and CRA under the premise of compact structure.

[0081] The present application adopts six lenses, optimizes the refractive power and surface shape of each lens, and makes the optical lens of the present application have at least one of the beneficial effects of miniaturization, high illumination, and high resolution. BRIEF DESCRIPTION OF DRAWINGS

[0082] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the specification explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0083] Figure 1 A structural schematic diagram of an optical lens of example one of the present application is shown.

[0084] Figure 2 A structural schematic diagram of an optical lens of Example Two of the present application is shown.

[0085] Figure 3 A structural schematic diagram of an optical lens of Example Three of the present application is shown.

[0086] Figure 4 A structural schematic diagram of an optical lens of Example Four of the present application is shown.

[0087] Figure 5 A structural schematic diagram of an optical lens of Example Five of the present application is shown.

[0088] Figure 6 A structural schematic diagram of an optical lens of Example Six of the present application is shown.

[0089] Figure 7 A structural schematic diagram of an optical lens of Example Seven of the present application is shown.

[0090] Figure 8 A structural schematic diagram of an optical lens of Example Eight of the present application is shown.

[0091] Wherein, the above drawings include the following reference signs:

[0092] L1, first lens; S1, first side of the first lens; S2, second side of the first lens; L2, second lens; S3, first side of the second lens; S4, second side of the second lens; L3, third lens; S5, first side of the third lens; S6, second side of the third lens; STO, stop; L4, fourth lens; L5, fifth lens; S10, first side of the fifth lens; S11, second side of the fifth lens; L6, sixth lens; S11, first side of the sixth lens; S12, second side of the sixth lens; S13, first side of the protective glass; S14, second side of the protective glass; IMA, imaging surface. DETAILED DESCRIPTION

[0093] It should be noted that the embodiments and the features in the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0094] It should be noted that, unless otherwise specified, all the technical and scientific terms used in the present application have the same meaning as that generally understood by the ordinary skilled in the art to which the present application belongs.

[0095] In the present application, the orientation words such as "upper", "lower", "top", "bottom" used without the opposite description are generally directed to the direction shown in the drawings or the vertical, perpendicular or gravity direction of the components themselves; similarly, for the convenience of understanding and description, "inner" and "outer" refer to the inner and outer relative to the contour of the components themselves, but the above orientation words are not used to limit the present application.

[0096] It should be noted that in the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another, and do not represent any limitation on the features. Therefore, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0097] In the drawings, the thickness, size and shape of the lens have been slightly exaggerated for the convenience of illustration. Specifically, the shape of the spherical or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The drawings are merely examples and are not strictly drawn to scale.

[0098] In this context, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens near the first side is the first side surface of the lens, and the surface of each lens near the second side is the second side surface of the lens. The judgment of the surface shape in the paraxial region can be based on the judgment method of those skilled in the art, with the R value (R refers to the radius of curvature in the paraxial region, usually refers to the R value on the lens data in the optical software) to judge the convexity and concavity. In terms of 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; in terms of 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.

[0099] 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.

[0100] In an exemplary embodiment, the optical lens provided by the present 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 the object side and the second side is the image side. The light rays from the object side can be imaged on the image side.

[0101] When the optical lens 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 example embodiment, the optical lens provided by the present application can be used as, for example, a projection lens or a laser radar transmitting end lens. At this time, the image side of the optical lens can be the image source side and the object side can be the imaging side. The 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.

[0102] In order to solve the problem that the optical lens in the prior art cannot simultaneously achieve miniaturization, high illumination and high resolution, the present application provides an optical lens and an electronic device.

[0103] Embodiment one

[0104] As shown in Figures 1 to 8 the optical lens sequentially comprises, from the first side to the second side, a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with negative focal power and a sixth lens with positive focal power, the first side of the first lens is a convex surface, and the second side is a concave surface; the first side of the second lens is a concave surface; the second side of the third lens is a convex surface; the second side of the fourth lens is a convex surface; the second side of the fifth lens is a concave surface; the first side of the sixth lens is a convex surface, and the second side is a convex surface.

[0105] The first lens has negative focal power, the first side of the first lens is a convex surface, and the second side is a concave surface. The first lens is designed to be crescent-shaped to collect as much light as possible in a large field of view, enter the rear optical system, and increase the light throughput; the first lens is designed to have a negative focal length to diverge the light rays, make the light rays transition smoothly, and at the same time make the large-angle light rays enter as much as possible, improve the illumination, and more favorably reduce the optical path of the light rays in the rear to achieve a short TTL, while increasing the light throughput.

[0106] The second lens has negative focal power and has a diverging effect on the light rays, which can disperse the central light rays and the edge light rays of each field of view; the first side of the second lens is a concave surface, which makes the center of the first side of the second lens relatively concave, helps to better receive the light rays from the second side of the first lens, and is conducive to balancing the divergence of the light rays in each field of view, making the overall light ray trend of the optical lens more gentle, and helping the rear optical system to better receive and converge the edge light rays to improve the edge field of view illumination; the second side of the second lens can be a convex surface or a concave surface, when the second side of the second lens is a concave surface, the outgoing light rays are more gentle, the edge light energy loss is reduced, and the edge illumination is further improved, and the second lens is preferably an aspherical lens, which is conducive to better improving the resolution; when the second side of the second lens is a convex surface, the second side of the second lens has a reverse curvature structure with a convex center and a concave edge, which is conducive to better balancing the aberrations of the center and the edge to improve the resolution.

[0107] The third lens has positive refractive power, the first side of the third lens can be concave or convex, and the second side of the third lens is convex. When the first side of the third lens is concave, the third lens is preferably an aspherical lens and has positive refractive power, converges light, balances the near-axis aberration and off-axis astigmatism, and the concave first side of the third lens helps the light transition to the fourth lens better, converges the light of each field of view better, and is conducive to improving the overall resolution and reducing the overall size of the optical lens.

[0108] The fourth lens has positive refractive power, the first side of the fourth lens can be convex or concave, and the second side of the fourth lens is convex. When the first side of the fourth lens is convex, the fourth lens has positive refractive power and is biconvex, converges light, and converges and collects the light of the front optical system. When the first side of the fourth lens is concave, the fourth lens has positive refractive power, and the concave first side of the fourth lens is matched with the convex second side of the third lens, which is conducive to the smooth transition of light.

[0109] The fifth lens has negative refractive power and diverges light, the first side of the fifth lens can be concave or convex, and the second side of the fifth lens is concave. The first side of the fifth lens can be concave or convex, which is conducive to the smooth transition of light to the sixth lens and ensures the stability of imaging. The second side of the fifth lens is concave, which is conducive to cooperation with the first side of the sixth lens, matches the sixth lens, fully corrects various aberrations in the system, improves the resolution, and optimizes the optical performance such as distortion and CRA under the premise of compact structure.

[0110] The sixth lens has positive refractive power, which is conducive to the smooth convergence of light to the imaging surface. The first side of the sixth lens is convex, and the second side of the sixth lens is convex. This is conducive to cooperation with the fifth lens, fully corrects various aberrations in the system, improves the resolution, and optimizes the optical performance such as distortion and CRA under the premise of compact structure.

[0111] The present application adopts six lenses, optimizes the refractive power and surface shape of each lens, and makes the optical lens of the present application have at least one of the beneficial effects of miniaturization, high illumination, and high resolution.

[0112] In the embodiment, the second side of the second lens is concave. This makes the outgoing light more gentle, reduces the loss of edge light energy, further improves the edge illumination, and preferably the second lens is an aspherical lens, which is conducive to better improving the resolution.

[0113] In the embodiment, the second side surface of the second lens is convex. The second side surface of the second lens is a reverse curve structure with a center convex and an edge concave, which is beneficial to better balance the center and edge aberrations and improve the resolution.

[0114] In the embodiment, the first side surface of the third lens is concave. The third lens is preferably an aspherical lens and has a positive focal power, which has a converging effect on light rays, balances the on-axis aberration and off-axis astigmatism, and the concave first side surface of the third lens is beneficial to better transition of the light rays to the fourth lens, better convergence of the light rays of each field of view, and improvement of the overall resolution and reduction of the overall size of the optical lens.

[0115] In the embodiment, the first side surface of the third lens is convex. When the first side surface of the third lens is convex, the central light rays are better converged in the third lens, the axial aberration is reduced, and the central resolution is improved.

[0116] In the embodiment, the first side surface of the fourth lens is convex. The fourth lens has a positive focal power and a double-convex shape, has a converging effect on light rays, and converges and collects the light rays of the front optical system.

[0117] In the embodiment, the first side surface of the fourth lens is concave. The fourth lens has a positive focal power, and the concave first side surface of the fourth lens is beneficial to the smooth transition of the light rays in cooperation with the convex second side surface of the third lens.

[0118] In the embodiment, the first side surface of the fifth lens is concave. This is beneficial to the smooth transition of the light rays to the sixth lens and ensures the imaging stability.

[0119] In the embodiment, the first side surface of the fifth lens is convex. This is beneficial to the smooth transition of the light rays to the sixth lens and ensures the imaging stability.

[0120] In the embodiment, the fifth lens and the sixth lens are glued to form a double-glued lens. This arrangement can smoothly transition the light rays passing through the sixth lens to the imaging surface, reduce the total length, fully correct various aberrations of the optical system, improve the resolution under the premise of compact structure, and optimize the optical performance such as distortion and CRA. The double-glued lens can reduce the air gap of the two lenses, reduce the total length of the system, reduce the components between the fifth lens and the sixth lens, reduce the process, and reduce the cost. It can also reduce the tolerance sensitivity problems such as tilt and eccentricity of the lens unit caused by the assembly process, reduce the light loss caused by reflection between the fifth lens and the sixth lens, improve the illumination, further reduce the field curvature, correct the off-axis point aberration of the system, and be beneficial to the reasonable allocation of focal length, help to realize thermal compensation, and obtain good temperature performance.

[0121] In the embodiment, the second lens, the third lens, the fifth lens and the sixth lens are all aspherical lenses. At least four aspherical lenses are adopted, which is beneficial to correcting system aberration and improving resolution.

[0122] In the embodiment, the second lens and / or the fifth lens is provided with a reverse curve. That is, either one or both of the second lens and the fifth lens can be provided with a reverse curve, which is beneficial to balancing aberration of central field of view and edge field of view and improving resolution.

[0123] In the embodiment, the optical lens further comprises a diaphragm, which is arranged between the third lens and the fourth lens or between the fourth lens and the fifth lens. By reasonably arranging the diaphragm position, the diaphragm aperture can be increased, the light entering the optical system can be effectively collected, the aperture of the lens in the optical system can be reduced, and the assembly sensitivity of the system can be reduced.

[0124] In the embodiment, the curvature radius R3 of the first side surface of the second lens and the overall focal length F of the optical lens satisfy R3 / F≤-0.001. Reasonably controlling the curvature radius of the first side surface of the second lens is beneficial to balancing the central light divergence of the second lens and is helpful to improving the relative luminance of the overall optical lens. Preferably, R3 / F≤-0.05.

[0125] In the embodiment, the curvature radius R3 of the first side surface of the second lens and the curvature radius R2 of the second side surface of the first lens satisfy R3 / R2≤-0.001. Satisfying this condition is helpful to better receiving the large-angle exiting light of the first lens by the second lens and is helpful to ensuring the edge luminance value under large angle. Preferably, -5.5≤R3 / R2≤-0.05.

[0126] In the 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 of the optical lens to the center of the imaging surface of the optical lens and the overall focal length F of the optical lens satisfy TTL / F≤9.5. Satisfying this condition ensures that the optical system has a shorter total length under the same focal length, which provides the optical lens with the characteristics of miniaturization and long focal length. Preferably, TTL / F≤8.5.

[0127] In the embodiment, the maximum effective light passing aperture D1 of the first side surface of the first lens corresponding to the maximum field of view angle of the optical lens and the maximum effective light passing aperture D12 of the second side surface of the sixth lens corresponding to the maximum field of view angle of the optical lens satisfy D1 / D12≤3.5. Satisfying this condition ensures that the front end of the optical lens has a smaller aperture while maintaining a more reasonable rear end aperture, ensuring the edge light flux, and providing the optical lens with the characteristics of miniaturization and high luminance. Preferably, D1 / D12≤2.8.

[0128] In the embodiment, the relative illumination at the maximum image height on an imaging surface of the optical lens satisfies 85≤RI*FOV, where RI is the relative illumination at the maximum image height on the imaging surface of the optical lens, and FOV is the maximum field angle of the optical lens. The condition is satisfied to ensure that the optical lens can realize large-angle imaging while satisfying the edge high-illumination characteristic. Preferably, 90≤RI*FOV.

[0129] In the embodiment, the Abbe number Vd2 of the second lens and the Abbe number Vd3 of the third lens satisfy 0.1≤Vd2 / Vd3≤4. The condition is satisfied to adjust the material configuration of the second lens and the third lens, which helps the optical system better correct chromatic aberration and improve imaging quality. Preferably, 0.5≤Vd2 / Vd3≤2.5.

[0130] In the embodiment, the focal length F56 of the doublet lens formed by the fifth lens and the sixth lens and the overall focal length F of the optical lens satisfy F56 / F≤20. By controlling the combined focal length of the doublet lens, the light ray trend entering the doublet lens can be effectively controlled, the off-axis aberration caused by the large-angle light ray entering through the first lens is reduced, and the lenses are compact, which is conducive to miniaturization. Preferably, F56 / F≤15.

[0131] In the embodiment, the total optical length of the optical lens, that is, the distance TTL from the first side center of the first lens of the optical lens to the center of the imaging surface of the optical lens and the air gap d4 between the second lens and the third lens satisfy 4.5≤TTL / d4≤25. By controlling the air gap between the second lens and the third lens within a reasonable range, the optical path of the light ray is ensured to be reasonable, which helps to compress the structure and realize miniaturization. Preferably, 7.5≤TTL / d4≤18.

[0132] In the embodiment, the curvature radius R11 of the first side surface of the sixth lens and the curvature radius R12 of the second side surface of the sixth lens satisfy 0.05≤|(R11+R12) / (R11-R12)|≤2. By controlling the curvature radius ratio of the two surfaces of the sixth lens in the doublet lens, the edge light ray trend is ensured to be relatively gentle, which helps to balance the off-axis aberration of the optical system. Preferably, 0.2≤|(R11+R12) / (R11-R12)|≤1.2.

[0133] In the embodiment, the curvature radius R5 of the first side surface of the third lens and the curvature radius R6 of the second side surface of the third lens satisfy R5 / R6≤15. By controlling the curvature radius of the two surfaces of the third lens, the light ray trend in the third lens is gentle, which helps to eliminate the near-axis aberration of the optical lens, and controlling the curvature ratio helps to control the shape of the optical lens and reduce the sensitivity of the optical lens. Preferably, R5 / R6≤10.

[0134] In the embodiment, the focal length F3 of the third lens and the total focal length F of the optical lens satisfy F3 / F≤15. By reasonably allocating the focal length of the third lens, the light can smoothly enter the optical system, and the light collection, the light quantity and the resolution are improved. Preferably, F3 / F≤8.

[0135] In the embodiment, the maximum field of view FOV of the optical lens, the total focal length F of the optical lens and the image height H corresponding to the maximum field of view of the optical lens satisfy 48≤(FOV×F) / H. Satisfying the condition formula is beneficial to simultaneously satisfy the long focal length and the large field of view, and the large angle resolution. Preferably, 55≤(FOV×F) / H. The maximum field of view FOV is associated with the image height H, which is the field of view corresponding to the image height.

[0136] In the embodiment, the sag SAG3 of the first side of the second lens and the sag SAG4 of the second side of the second lens satisfy -20≤SAG4 / SAG3≤35. By controlling the sag ratio of the second lens within a reasonable range, the smooth transition of the light is facilitated, and the resolution is improved. Preferably, -15≤SAG4 / SAG3≤30.

[0137] In the embodiment, the focal length F1 of the first lens and the focal length F2 of the second lens satisfy F1 / F2≤5. Reasonable allocation of the focal length of the front negative lens facilitates the entry of the large-angle light into the optical system, and improves the peripheral field of view resolution. Preferably, F1 / F2≤2.

[0138] In the embodiment, the maximum effective light aperture D1 of the first side of the first lens corresponding to the maximum field of view of the optical lens and the total focal length F of the optical lens satisfy D1 / F≤8. Satisfying the condition formula ensures the characteristics of the small front aperture of the optical lens in the case of a certain focal length, which is beneficial to the miniaturization of the optical lens. Preferably, D1 / F≤6.

[0139] In the embodiment, the total optical length of the optical lens, i.e. the center distance TTL from the first side center of the first lens of the optical lens to the center of the imaging surface of the optical lens and the optical back focal length of the optical lens, i.e. the center distance BFL from the second side center of the last lens of the optical lens to the center of the imaging surface satisfy BFL / TTL≥0.1. Satisfying the condition formula ensures a longer back focal length of the optical system, and reserves sufficient assembly space at the rear end while ensuring a shorter total length. Preferably, BFL / TTL≥0.15.

[0140] 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, the image height H corresponding to the maximum field of view of the optical lens, and the radian value θ corresponding to the maximum field of view of the optical lens, satisfy the condition: TTL / H / θ≤2. Satisfying this condition effectively limits the length of the optical lens under the same imaging plane and the same field of view, providing miniaturization characteristics for the optical lens. Preferably, TTL / H / θ≤1.

[0141] 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, and the distance L from the aperture stop to the imaging plane, satisfy the condition: TTL / L ≤ 3.5. Satisfying this condition ensures that the aperture stop is positioned appropriately in the optical system, which helps balance the light path of the front and rear optical systems, making the overall optical system more compact and helping to control the size of the optical lens, achieving miniaturization. Preferably, TTL / L ≤ 2.5.

[0142] In this embodiment, the maximum effective aperture D1 of the first side of the first lens corresponding to the maximum field of view of the optical lens satisfies the condition D1 / L ≤ 2.2 with respect to the distance L from the aperture stop to the imaging plane. Satisfying this condition ensures a small front aperture by placing the appropriate aperture stop, which is beneficial for miniaturization of the optical lens. Preferably, D1 / L ≤ 1.8.

[0143] In this embodiment, the center thickness d10 of the fifth lens, the center thickness d11 of the sixth lens, and the total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the imaging plane of the optical lens, satisfy the condition: (d10+d11) / TTL≤0.4. Satisfying this condition, appropriately increasing the center thickness of the cemented doublet lens within a certain range, is beneficial for enhancing the light control capability, balancing aberrations generated by the front-end optical system, and improving resolution. Preferably, (d10+d11) / TTL≤0.3.

[0144] Example 2

[0145] like Figures 1 to 8 As shown, the optical lens, from the first side to the second side, sequentially includes: a first lens with negative optical power; a second lens with negative optical power; a third lens with positive optical power; a fourth lens with positive optical power; a fifth lens with negative optical power; and a sixth lens with positive optical power. The radius of curvature R3 of the first side of the second lens satisfies the following relationship with the overall focal length F of the optical lens: R3 / F ≤ -0.001. Reasonably controlling the radius of curvature of the first side of the second lens is beneficial for balancing the divergence of the central light rays and helps improve the overall relative illumination of the optical lens. Preferably, R3 / F ≤ -0.05.

[0146] In the embodiment, the first side surface of the first lens is convex, and the second side surface is concave. The first lens is designed as a meniscus shape to collect as much light as possible in a large field of view, enter the rear optical system, and increase the light throughput; the first lens is arranged as a negative focal length to diverge the light, make the light transition smoothly, and make the light in a large angle enter as much as possible to improve the illumination, which is more conducive to the reduction of the light path of the rear light to achieve a short TTL and increase the light throughput.

[0147] In the embodiment, the first side surface of the second lens is concave, and the second side surface is concave. The first side surface of the second lens is concave, so that the center of the first side surface of the second lens is relatively concave, which helps to better receive the light of the second side surface of the first lens, and is conducive to balancing the divergence of light in each field of view, so that the overall light transition of the optical lens is more gentle, which helps the rear optical system to better receive and converge the edge light, and improves the edge field of view illumination; the second side surface of the second lens is concave, so that the outgoing light is more gentle, reduces the loss of edge light energy, and further improves the edge illumination. The second lens is preferably an aspherical lens, which is conducive to better improving the resolution.

[0148] In the embodiment, the first side surface of the second lens is concave, and the second side surface is convex. The first side surface of the second lens is concave, so that the center of the first side surface of the second lens is relatively concave, which helps to better receive the light of the second side surface of the first lens, and is conducive to balancing the divergence of light in each field of view, so that the overall light transition of the optical lens is more gentle, which helps the rear optical system to better receive and converge the edge light, and improves the edge field of view illumination; the second side surface of the second lens is a reverse curvature structure with a convex center and a concave edge, which is conducive to better balancing the aberration of the center and the edge, and improving the resolution.

[0149] In the embodiment, the first side surface of the third lens is concave, and the second side surface is convex. When the first side surface of the third lens is concave, the third lens is preferably an aspherical lens and has a positive focal length, which converges light, balances the on-axis aberration and off-axis astigmatism, and the first side surface of the third lens is concave, which helps the light to better transition to the fourth lens, so that the light in each field of view is better converged, which is conducive to improving the overall resolution of the optical lens and reducing the overall size.

[0150] In the embodiment, the first side surface of the third lens is convex, and the second side surface is convex. When the first side surface of the third lens is convex, the central light is better converged in the third lens, which reduces the axial aberration and improves the central resolution.

[0151] In the embodiment, the first side surface of the fourth lens is convex, and the second side surface is convex. When the first side surface of the fourth lens is convex, the fourth lens has a positive focal length and a double-convex shape, which converges light and collects the light of the front optical system.

[0152] In the embodiment, the first side surface of the fourth lens is concave, and the second side surface is convex. When the first side surface of the fourth lens is concave, the fourth lens has a positive focal power, and the first side surface of the fourth lens being concave matches the second side surface of the third lens being convex, which is conducive to the smooth transition of light.

[0153] In the embodiment, the first side surface of the fifth lens is concave, and the second side surface is concave. The first side surface of the fifth lens can be concave or convex, which is conducive to the smooth transition of light to the sixth lens and ensures the imaging stability. The second side surface of the fifth lens is concave, which is conducive to the cooperation with the first side surface of the sixth lens. The cooperation with the sixth lens can fully correct various aberrations in the system, improve the resolution, and optimize the optical performance such as distortion and CRA under the premise of compact structure.

[0154] In the embodiment, the first side surface of the fifth lens is concave, and the second side surface is concave. The first side surface of the fifth lens can be concave or convex, which is conducive to the smooth transition of light to the sixth lens and ensures the imaging stability. The second side surface of the fifth lens is concave, which is conducive to the cooperation with the first side surface of the sixth lens. The cooperation with the sixth lens can fully correct various aberrations in the system, improve the resolution, and optimize the optical performance such as distortion and CRA under the premise of compact structure.

[0155] In the embodiment, the first side surface of the sixth lens is convex, and the second side surface is convex. This is conducive to the cooperation with the fifth lens, which can fully correct various aberrations in the system, improve the resolution, and optimize the optical performance such as distortion and CRA under the premise of compact structure.

[0156] The present application adopts six lenses. By optimizing the focal power and surface shape of each lens, the optical lens of the present application has at least one of the following advantages: miniaturization, high illumination, and high resolution.

[0157] In the embodiment, the fifth lens and the sixth lens are glued to form a double-glued lens. This arrangement can smoothly transition the light passing through the sixth lens to the imaging surface, reducing the total length. At the same time, it can fully correct various aberrations of the optical system, improve the resolution, and optimize the optical performance such as distortion and CRA under the premise of compact structure. The double-glued lens can reduce the air gap of the two lenses, reduce the total length of the system, reduce the components between the fifth lens and the sixth lens, reduce the process, and reduce the cost. It can also reduce the tolerance sensitivity problem of the lens unit caused by the inclination and eccentricity in the assembly process. At the same time, it can reduce the light loss caused by reflection between the fifth lens and the sixth lens, improve the illumination, further reduce the field curvature, correct the off-axis point aberration of the system, and help to achieve thermal compensation and obtain good temperature performance.

[0158] In the embodiment, the second lens, the third lens, the fifth lens and the sixth lens are all aspherical lenses. At least four aspherical lenses are adopted, which is beneficial to correct system aberration and improve resolution.

[0159] In the embodiment, the second lens and / or the fifth lens is provided with a reverse curve. That is, either one or both of the second lens and the fifth lens can be provided with a reverse curve. The reverse curve is beneficial to balance the aberration of the central field of view and the edge field of view, and improve the resolution.

[0160] In the embodiment, the optical lens further comprises a diaphragm, which is arranged between the third lens and the fourth lens, or arranged between the fourth lens and the fifth lens. By reasonably arranging the position of the diaphragm, the aperture of the diaphragm can be increased, the light entering the optical system can be effectively collected, the aperture of the lens in the optical system can be reduced, and the assembly sensitivity of the system can be reduced.

[0161] In the embodiment, the curvature radius R3 of the first side surface of the second lens and the curvature radius R2 of the second side surface of the first lens satisfy: R3 / R2≤-0.001. Satisfying the condition formula is helpful for the large-angle outgoing light of the first lens to be better received by the second lens, and is helpful for ensuring the edge illumination value under large angle. Preferably, -5.5≤R3 / R2≤-0.05.

[0162] In the 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 of the optical lens to the center of the imaging surface of the optical lens, and the total focal length F of the optical lens satisfy: TTL / F≤9.5. Satisfying the condition formula ensures that the optical system has a shorter total length under the same focal length, and provides the optical lens with the characteristics of miniaturization and long focal length. Preferably, TTL / F≤8.5.

[0163] In the embodiment, the maximum effective light passing aperture D1 of the first side surface of the first lens corresponding to the maximum field of view angle of the optical lens and the maximum effective light passing aperture D12 of the second side surface of the sixth lens corresponding to the maximum field of view angle of the optical lens satisfy: D1 / D12≤3.5. Satisfying the condition formula ensures that the front end of the optical lens has a smaller aperture while maintaining a more reasonable rear end aperture, ensuring the edge light flux, and providing the optical lens with the characteristics of miniaturization and high illumination. Preferably, D1 / D12≤2.8.

[0164] In the embodiment, the relative illumination at the maximum image height on an imaging surface of the optical lens satisfies 85≤RI*FOV, where RI is the relative illumination at the maximum image height on the imaging surface of the optical lens, and FOV is the maximum field angle of the optical lens. The condition is satisfied to ensure that the optical lens can realize large-angle imaging while satisfying the edge high-illumination characteristic. Preferably, 90≤RI*FOV.

[0165] In the embodiment, the Abbe number Vd2 of the second lens and the Abbe number Vd3 of the third lens satisfy 0.1≤Vd2 / Vd3≤4. The condition is satisfied to adjust the material configuration of the second lens and the third lens, which helps the optical system better correct chromatic aberration and improve imaging quality. Preferably, 0.5≤Vd2 / Vd3≤2.5.

[0166] In the embodiment, the focal length F56 of the doublet lens formed by the fifth lens and the sixth lens and the overall focal length F of the optical lens satisfy F56 / F≤20. By controlling the combined focal length of the doublet lens, the light ray trend entering the doublet lens can be effectively controlled, the off-axis aberration caused by the large-angle light ray entering through the first lens is reduced, and the lenses are compact, which is conducive to miniaturization. Preferably, F56 / F≤15.

[0167] In the embodiment, the total optical length of the optical lens, that is, the distance TTL from the first side center of the first lens of the optical lens to the center of the imaging surface of the optical lens and the air gap d4 between the second lens and the third lens satisfy 4.5≤TTL / d4≤25. By controlling the air gap between the second lens and the third lens within a reasonable range, the optical path of the light ray is ensured to be reasonable, which helps to compress the structure and realize miniaturization. Preferably, 7.5≤TTL / d4≤18.

[0168] In the embodiment, the radius of curvature R11 of the first side surface of the sixth lens and the radius of curvature R12 of the second side surface of the sixth lens satisfy 0.05≤|(R11+R12) / (R11-R12)|≤2. By controlling the ratio of the radii of curvature of the two surfaces of the sixth lens in the doublet lens, the edge light ray trend is ensured to be relatively gentle, which helps to balance the off-axis aberration of the optical system. Preferably, 0.2≤|(R11+R12) / (R11-R12)|≤1.2.

[0169] In the embodiment, the radius of curvature R5 of the first side surface of the third lens and the radius of curvature R6 of the second side surface of the third lens satisfy R5 / R6≤15. By controlling the radii of curvature of the two surfaces of the third lens, the light ray trend in the third lens is gentle, which helps to eliminate the near-axis aberration of the optical lens, and controlling the curvature ratio helps to control the shape of the optical lens and reduce the sensitivity of the optical lens. Preferably, R5 / R6≤10.

[0170] In the embodiment, the focal length F3 of the third lens and the total focal length F of the optical lens satisfy: F3 / F≤15. By reasonably allocating the focal length of the third lens, the light can smoothly enter the optical system, and the light collection, the light quantity and the resolution are improved. Preferably, F3 / F≤8.

[0171] In the embodiment, the maximum field of view FOV of the optical lens, the total focal length F of the optical lens and the image height H corresponding to the maximum field of view of the optical lens satisfy: 48≤(FOV×F) / H. Satisfying the condition formula is beneficial to simultaneously satisfy the long focal length and the large field of view, and the large angle resolution. Preferably, 55≤(FOV×F) / H. The maximum field of view FOV is associated with the field of view corresponding to the image height.

[0172] In the embodiment, the sag SAG3 of the first side of the second lens and the sag SAG4 of the second side of the second lens satisfy: -20≤SAG4 / SAG3≤35. By controlling the sag ratio of the second lens within a reasonable range, the light can smoothly transition, and the resolution is improved. Preferably, -15≤SAG4 / SAG3≤30.

[0173] In the embodiment, the focal length F1 of the first lens and the focal length F2 of the second lens satisfy: F1 / F2≤5. Reasonable allocation of the focal length of the front negative lens helps the large-angle light to enter the optical system better, and improves the peripheral field of view resolution. Preferably, F1 / F2≤2.

[0174] In the embodiment, the maximum effective light aperture D1 of the first side of the first lens corresponding to the maximum field of view of the optical lens and the total focal length F of the optical lens satisfy: D1 / F≤8. Satisfying the condition formula ensures the characteristics of the small front aperture of the optical lens under the condition of the focal length, which helps the miniaturization of the optical lens. Preferably, D1 / F≤6.

[0175] In the embodiment, the total optical length of the optical lens, that is, the center distance TTL from the first side center of the first lens of the optical lens to the center of the imaging surface of the optical lens and the optical back focal length of the optical lens, that is, the center distance BFL from the second side center of the last lens of the optical lens to the center of the imaging surface satisfy: BFL / TTL≥0.1. Satisfying the condition formula ensures that the optical system has a longer back focal length, and reserves enough assembly space at the rear end while ensuring the total length. Preferably, BFL / TTL≥0.15.

[0176] In the embodiment, the optical total length of the optical lens, i.e., the center distance TTL from the first side center of the first lens of the optical lens to the center of the imaging surface of the optical lens, the image height H corresponding to the maximum field angle of the optical lens, and the radian value θ corresponding to the maximum field angle of the optical lens satisfy: TTL / H / θ≤2. Under the condition that the imaging surface and the field angle are the same, the length of the optical lens can be effectively limited, and the optical lens can be provided with the characteristic of miniaturization. Preferably, TTL / H / θ≤1.

[0177] In the embodiment, the optical total length of the optical lens, i.e., the center distance TTL from the first side center of the first lens of the optical lens to the center of the imaging surface of the optical lens, and the distance L from the diaphragm to the imaging surface satisfy: TTL / L≤3.5. Under the condition that the condition is satisfied, the diaphragm is in a more appropriate position in the optical system, which helps to balance the light ray trend of the front and rear optical systems, so that the overall optical system is more compact, which helps to control the volume of the optical lens and achieve the purpose of miniaturization. Preferably, TTL / L≤2.5.

[0178] In the embodiment, the maximum effective aperture D1 of the first side of the first lens corresponding to the maximum field angle of the optical lens and the distance L from the diaphragm to the imaging surface satisfy: D1 / L≤2.2. Under the condition that the condition is satisfied, the appropriate diaphragm position helps to ensure that the front aperture is small, which helps to miniaturize the optical lens. Preferably, D1 / L≤1.8.

[0179] In the embodiment, the center thickness d10 of the fifth lens, the center thickness d11 of the sixth lens, and the optical total length of the optical lens, i.e., the center distance TTL from the first side center of the first lens of the optical lens to the center of the imaging surface of the optical lens satisfy: (d10+d11) / TTL≤0.4. Under the condition that the condition is satisfied, the center thickness of the double-cemented lens is appropriately increased within a certain range, which is beneficial to enhance the light regulation ability and balance the aberration generated by the front optical system to improve the resolution. Preferably, (d10+d11) / TTL≤0.3.

[0180] Optionally, the optical lens described above can further include a color filter for correcting color deviation and a protective glass for protecting the photosensitive element located on the imaging surface.

[0181] The optical lens in the present application can adopt multiple lenses, for example, the above-mentioned six lenses. The present application does not specifically limit the specific number of spherical lenses and aspherical lenses. When the imaging quality is emphasized, the number of aspherical lenses can be increased. The aspherical lens has the characteristic that the curvature is continuously changed from the center of the lens to the periphery of the lens. Unlike the spherical lens which has a constant curvature from the center of the lens to the periphery of the lens, the aspherical lens has better curvature radius characteristics, and has the advantages of improving the distortion aberration and improving the astigmatism aberration. After the aspherical lens is adopted, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0182] In the example embodiment, the present application does not limit the plastic and glass of the lens. If the temperature performance is emphasized, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens can all be glass lenses. The optical lens made of glass can inhibit the shift of the back focus of the optical lens with the change of temperature, so as to improve the system stability. At the same time, the use of glass material can avoid the imaging blur of the lens caused by the high and low temperature changes in the use environment, which affects the normal use of the optical lens. For example, the optical lens with all-glass design has a wide temperature range, and can maintain stable optical performance in the range of -40℃ to 105℃. Specifically, when the imaging quality and reliability are emphasized, the first lens to the sixth lens can all be glass aspherical lenses. Of course, in the application occasion with low temperature stability requirement, the first lens to the sixth lens in the optical lens can also be made of plastic. The optical lens made of plastic can effectively reduce the manufacturing cost. Of course, the first lens to the sixth lens in the optical lens can also be made of plastic and glass.

[0183] The present application also provides an electronic device comprising the optical lens described above and an imaging element for converting the optical image formed by the optical lens into an electrical signal. The imaging element can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor device (CMOS). The electronic device can be a separate imaging device such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. The electronic device is equipped with the optical lens described above.

[0184] However, those skilled in the art should understand that the number of lenses constituting the optical lens can be changed without departing from the technical solution claimed by the present application, so as to obtain the various results and advantages described in the present application. For example, although the six lenses are described as an example in the embodiment, the optical lens is not limited to including six lenses. If necessary, the optical lens can also include other number of lenses.

[0185] The specific surface shape and parameters of the optical lens applicable to the above-mentioned embodiment are further described below with reference to the accompanying drawings.

[0186] It is to be noted that any one of the following examples 1 to 8 is applicable to all embodiments of the present application.

[0187] Example 1

[0188] As shown in FIG. 1, it is a schematic diagram of the optical lens structure of example 1. Figure 1

[0189] As shown in FIG. 1, the optical lens sequentially comprises, from the first side to the second side: a first lens L1, a second lens L2, a third lens L3, a stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a first side surface S13 of a protection glass, a second side surface S14 of the protection glass, and an imaging surface IMA. Figure 1

[0190] The first lens L1 has a negative focal power, the first side surface S1 of the first lens is a convex surface, and the second side surface S2 of the first lens is a concave surface. The second lens L2 has a negative focal power, the first side surface S3 of the second lens is a concave surface, and the second side surface S4 of the second lens is a concave surface. The third lens L3 has a positive focal power, the first side surface S5 of the third lens is a concave surface, and the second side surface S6 of the third lens is a convex surface. The fourth lens L4 has a positive focal power, the first side surface S8 of the fourth lens is a convex surface, and the second side surface S9 of the fourth lens is a convex surface. The fifth lens L5 has a negative focal power, the first side surface S10 of the fifth lens is a convex surface, and the second side surface S11 of the fifth lens is a concave surface. The sixth lens L6 has a positive focal power, the first side surface S11 of the sixth lens is a convex surface, and the second side surface S12 of the sixth lens is a convex surface. The light from the first side sequentially passes through each surface S1 to S14 and is finally imaged on the imaging surface IMA. Since the fifth lens L5 and the sixth lens L6 are cemented to form a double cemented lens, the second side surface S11 of the fifth lens and the first side surface S11 of the sixth lens are the same surface.

[0191] In this example, the total effective focal length F of the optical lens is 2.454 mm, the maximum field of view FOV of the optical lens is 180°, and the total length TTL of the optical lens is 19.695 mm.

[0192] In this example, the first side surface S3 of the second lens is provided with a reverse curvature, and the first side surface S10 of the fifth lens is provided with a reverse curvature.

[0193] Table 1 shows the basic structure parameter table of the optical lens of example 1, wherein the units of the curvature radius Radius and the thickness Thickness / distance are millimeters (mm).

[0194] Surf Radius Thickness Nd Vd 1 14.508 1.147 1.80 46.57 2 3.750 2.733 3 -8.148 1.428 1.54 56.11 4 15.491 1.299 5 -9.796 2.506 1.64 23.53 6 -4.377 -0.139 STO Infinity 0.517 8 11.537 2.275 1.76 52.33 9 -5.554 0.302 10 18.656 0.550 1.64 23.53 11 1.636 3.891 1.51 56.22 12 -27.025 0.462 13 Infinity 0.900 1.52 64.21 14 Infinity 1.824 IMA / /

[0195] Table 1

[0196] ​​In Example One, the surface shape of each aspherical lens can be defined by, but not limited to, the following aspherical equation:

[0197]

[0198] wherein x is the sag of the aspherical surface at a position along the optical axis at a height h from the vertex of the aspherical surface; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the inverse of the radius of curvature R in Table 1 above); k is the conic constant; A, B, C, D, E are the higher order coefficients. Table 2 below shows the conic constant k and the higher order coefficients A, B, C, D, E, F, G for the aspherical surfaces S3, S4, S5, S6, S10, S11 and S12 in Example One.

[0199]

[0200] Table 2

[0201] Example Two

[0202] As shown in FIG. 2, the optical lens structure of Example Two is a schematic diagram. In this and the following examples, for the sake of brevity, some similar descriptions as in Example One will be omitted. Figure 2 As shown in FIG. 2, the optical lens structure includes, in order from the first side to the second side: a first lens L1, a second lens L2, a third lens L3, a stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a first side surface S13 of a protective glass, a second side surface S14 of the protective glass, and an imaging surface IMA.

[0203] Figure 2 As shown in FIG. 2, the optical lens structure includes, in order from the first side to the second side: a first lens L1, a second lens L2, a third lens L3, a stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a first side surface S13 of a protective glass, a second side surface S14 of the protective glass, and an imaging surface IMA.

[0204] The first lens L1 has a negative focal power, the first side surface S1 of the first lens is a convex surface, and the second side surface S2 of the first lens is a concave surface. The second lens L2 has a negative focal power, the first side surface S3 of the second lens is a concave surface, and the second side surface S4 of the second lens is a concave surface. The third lens L3 has a positive focal power, the first side surface S5 of the third lens is a concave surface, and the second side surface S6 of the third lens is a convex surface. The fourth lens L4 has a positive focal power, the first side surface S8 of the fourth lens is a convex surface, and the second side surface S9 of the fourth lens is a convex surface. The fifth lens L5 has a negative focal power, the first side surface S10 of the fifth lens is a convex surface, and the second side surface S11 of the fifth lens is a concave surface. The sixth lens L6 has a positive focal power, the first side surface S11 of the sixth lens is a convex surface, and the second side surface S12 of the sixth lens is a convex surface. Light from the first side sequentially passes through the surfaces S1 to S14 and is finally imaged on the imaging surface IMA. Since the fifth lens L5 and the sixth lens L6 are cemented to form a double cemented lens, the second side surface S11 of the fifth lens and the first side surface S11 of the sixth lens are the same surface.

[0205] ​In the present example, the total effective focal length F of the optical lens is 2.418 mm, the maximum field of view FOV of the optical lens is 180°, and the total length TTL of the optical lens is 19.700 mm.

[0206] In the present example, the first side S3 of the second lens is configured to be concave, and the first side S10 of the fifth lens is configured to be concave.

[0207] Table 3 shows the basic structure parameter table of the optical lens of Example Two, wherein the units of the radius of curvature Radius and the thickness Thickness / distance are millimeters (mm).

[0208] Surf Radius Thickness Nd Vd 1 14.130 1.120 1.80 46.57 2 3.597 2.352 3 -11.020 1.130 1.54 56.11 4 11.761 1.510 5 -6.765 2.639 1.64 23.53 6 -3.668 -0.250 STO Infinity 0.501 8 11.760 2.390 1.76 52.33 9 -5.702 0.289 10 182.917 0.550 1.64 23.53 11 1.688 4.316 1.51 56.22 12 -8.943 0.462 13 Infinity 0.900 1.52 64.21 14 Infinity 1.793 IMA / /

[0209] Table 3

[0210] Table 4 shows the high-order term coefficients of the aspherical surfaces that can be used in Example Two, wherein each aspherical surface type can be defined by the formula (1) given in Example One above.

[0211]

[0212] Table 4

[0213] Example Three

[0214] As shown in FIG. 3, a schematic diagram of the optical lens structure of Example Three is shown. Figure 3

[0215] As shown in FIG. 3, a schematic diagram of the optical lens structure of Example Three is shown. Figure 3 As shown in FIG. 3, a schematic diagram of the optical lens structure of Example Three is shown.

[0216] ​The first lens L1 has negative focal power, the first side S1 of the first lens is convex, and the second side S2 of the first lens is concave. The second lens L2 has negative focal power, the first side S3 of the second lens is concave, and the second side S4 of the second lens is concave. The third lens L3 has positive focal power, the first side S5 of the third lens is concave, and the second side S6 of the third lens is convex. The fourth lens L4 has positive focal power, the first side S8 of the fourth lens is concave, and the second side S9 of the fourth lens is convex. The fifth lens L5 has negative focal power, the first side S10 of the fifth lens is convex, and the second side S11 of the fifth lens is concave. The sixth lens L6 has positive focal power, the first side S11 of the sixth lens is convex, and the second side S12 of the sixth lens is convex. Light from the first side sequentially passes through the surfaces S1 to S14 and is finally imaged on the imaging plane IMA. Since the fifth lens L5 and the sixth lens L6 are cemented to form a double cemented lens, the second side S11 of the fifth lens and the first side S11 of the sixth lens are the same surface.

[0217] In this example, the total effective focal length F of the optical lens is 2.516 mm, the maximum field of view FOV of the optical lens is 180°, and the total length TTL of the optical lens is 19.708 mm.

[0218] In this example, the first side S3 of the second lens is provided with a reverse curve.

[0219] Table 5 shows the basic structure parameter table of the optical lens of Example Three, wherein the units of the radius of curvature Radius and the thickness Thickness / distance are millimeters (mm).

[0220]

[0221]

[0222] Table 5

[0223] Table 6 shows the high-order term coefficients of the aspherical surfaces that can be used in Example Three, wherein each aspherical surface type can be defined by the formula (1) given in Example One above.

[0224]

[0225] Table 6

[0226] Example Four

[0227] As shown in FIG. 4, it is a schematic diagram of the optical lens structure of Example Four. Figure 4

[0228] Figure 4 ​​As shown, the optical lens comprises, in order from the first side to the second side: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a diaphragm STO, a fifth lens L5, a sixth lens L6, a first side surface S13 of a protective glass, a second side surface S14 of the protective glass, and an imaging surface IMA.

[0229] The first lens L1 has a negative focal power, the first side surface S1 of the first lens is a convex surface, and the second side surface S2 of the first lens is a concave surface. The second lens L2 has a negative focal power, the first side surface S3 of the second lens is a concave surface, and the second side surface S4 of the second lens is a concave surface. The third lens L3 has a positive focal power, the first side surface S5 of the third lens is a concave surface, and the second side surface S6 of the third lens is a convex surface. The fourth lens L4 has a positive focal power, the first side surface S7 of the fourth lens is a concave surface, and the second side surface S8 of the fourth lens is a convex surface. The fifth lens L5 has a negative focal power, the first side surface S10 of the fifth lens is a convex surface, and the second side surface S11 of the fifth lens is a concave surface. The sixth lens L6 has a positive focal power, the first side surface S11 of the sixth lens is a convex surface, and the second side surface S12 of the sixth lens is a convex surface. Light from the first side sequentially passes through each surface S1 to S14 and is finally imaged on the imaging surface IMA. Since the fifth lens L5 and the sixth lens L6 are cemented to form a double-cemented lens, the second side surface S11 of the fifth lens and the first side surface S11 of the sixth lens are the same surface.

[0230] In this example, the total effective focal length F of the optical lens is 2.429 mm, the maximum field of view FOV of the optical lens is 180°, and the total length TTL of the optical lens is 19.701 mm.

[0231] In this example, the first side surface S3 of the second lens is provided with a reverse curvature.

[0232] Table 7 shows a basic structure parameter table of the optical lens of Example Four, wherein the units of the radius of curvature Radius and the thickness Thickness / distance are millimeters (mm).

[0233] Surf Radius Thickness Nd Vd 1 12.237 1.100 1.80 46.57 2 3.281 2.755 3 -16.639 0.999 1.54 56.11 4 4.835 1.583 5 -46.228 1.001 1.54 56.11 6 -6.722 0.300 7 -26.210 1.915 1.75 52.34 8 -4.446 0.100 STO Infinity 1.935 10 4.440 0.799 1.64 23.53 11 1.514 3.716 1.51 56.22 12 -13.355 0.100 13 Infinity 0.900 1.52 64.21 14 Infinity 2.499 IMA / /

[0234] Table 7

[0235] Table 8 shows the high-order term coefficients of the aspherical surfaces that can be used in Example Four, wherein each aspherical surface type can be defined by the formula (1) given in Example One above.

[0236]

[0237] Table 8

[0238] Example Five

[0239] As Figure 5The diagram shown is a schematic of the optical lens structure of Example 5.

[0240] like Figure 5 As shown, the optical lens includes, from the first side to the second side, the following components in sequence: first lens L1, second lens L2, third lens L3, fourth lens L4, aperture STO, 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 negative optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is concave, and its second side surface S4 is concave. The third lens L3 has positive optical power, its first side surface S5 is convex, and its second side surface S6 is convex. The fourth lens L4 has positive optical power, its first side surface S7 is convex, and its second side surface S8 is convex. The fifth lens L5 has negative optical power, its first side surface S10 is convex, and its second side surface S11 is concave. The sixth lens L6 has positive optical power, its first side surface S11 is convex, and its second side surface S12 is convex. Light from the first side passes sequentially through surfaces S1 to S14 and is finally imaged onto the imaging plane IMA. Since the fifth lens L5 and the sixth lens L6 are cemented together to form a cemented doublet lens, the second side surface S11 of the fifth lens and the first side surface S11 of the sixth lens are the same surface.

[0242] In this example, the total effective focal length F of the optical lens is 2.501mm, the maximum field of view (FOV) of the optical lens is 180°, and the total length (TTL) of the optical lens is 19.711mm.

[0243] In this example, the first side surface S10 of the fifth lens is curved.

[0244] Table 9 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).

[0245] Surf Radius Thickness Nd Vd 1 13.880 1.100 1.80 46.57 2 3.643 2.870 3 -9.044 0.616 1.54 56.11 4 4.142 1.849 5 15.424 1.015 1.54 56.11 6 -9.450 0.916 7 11.760 2.177 1.75 52.34 8 -5.538 0.100 STO Infinity 1.839 10 10.213 0.550 1.64 23.53 11 1.623 3.218 1.51 56.22 12 -8.644 0.100 13 Infinity 0.900 1.52 64.21 14 Infinity 2.461 IMA / /

[0246] Table 9

[0247] Table 10 shows the higher-order coefficients that can be used for each aspherical mirror in Example 5, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0248]

[0249]

[0250] Table 10

[0251] Example 6

[0252] like Figure 6 The diagram shown is a schematic of the optical lens structure of Example 6.

[0253] like Figure 6 As shown, the optical lens includes, from the first side to the second side, the following components in sequence: first lens L1, second lens L2, third lens L3, fourth lens L4, aperture STO, fifth lens L5, sixth lens L6, first side surface of protective glass S13, second side surface of protective glass S14, and imaging surface IMA.

[0254] The first lens L1 has negative optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 has negative optical power, its first side surface S3 is concave, and its second side surface S4 is concave. The third lens L3 has positive optical power, its first side surface S5 is convex, and its second side surface S6 is convex. The fourth lens L4 has positive optical power, its first side surface S7 is convex, and its second side surface S8 is convex. The fifth lens L5 has negative optical power, its first side surface S10 is convex, and its second side surface S11 is concave. The sixth lens L6 has positive optical power, its first side surface S11 is convex, and its second side surface S12 is convex. Light from the first side passes sequentially through surfaces S1 to S14 and is finally imaged onto the imaging plane IMA. Since the fifth lens L5 and the sixth lens L6 are cemented together to form a cemented doublet lens, the second side surface S11 of the fifth lens and the first side surface S11 of the sixth lens are the same surface.

[0255] In this example, the total effective focal length F of the optical lens is 2.519mm, the maximum field of view (FOV) of the optical lens is 180°, and the total length (TTL) of the optical lens is 19.846mm.

[0256] In this example, the first side surface S10 of the fifth lens is curved.

[0257] Table 11 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).

[0258]

[0259]

[0260] Table 11

[0261] Table 12 shows the high order term coefficients of each aspherical surface in Example Six, wherein each aspherical surface type can be defined by the formula (1) given in Example One.

[0262]

[0263] Table 12

[0264] Example Seven

[0265] As shown in FIG. 7, there is a schematic view of the optical lens structure of Example Seven. Figure 7

[0266] As shown in FIG. 7, the optical lens structure includes, in order from the first side to the second side, a first lens L1, a second lens L2, a third lens L3, a stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a first side surface S13 of a protection glass, a second side surface S14 of the protection glass, and an imaging surface IMA. Figure 7 The first lens L1 has a negative refractive power, the first side surface S1 of the first lens is a convex surface, and the second side surface S2 of the first lens is a concave surface. The second lens L2 has a negative refractive power, the first side surface S3 of the second lens is a concave surface, and the second side surface S4 of the second lens is a convex surface. The third lens L3 has a positive refractive power, the first side surface S5 of the third lens is a concave surface, and the second side surface S6 of the third lens is a convex surface. The fourth lens L4 has a positive refractive power, the first side surface S8 of the fourth lens is a convex surface, and the second side surface S9 of the fourth lens is a convex surface. The fifth lens L5 has a negative refractive power, the first side surface S10 of the fifth lens is a concave surface, and the second side surface S11 of the fifth lens is a concave surface. The sixth lens L6 has a positive refractive power, the first side surface S11 of the sixth lens is a convex surface, and the second side surface S12 of the sixth lens is a convex surface. Light from the first side sequentially passes through the surfaces S1-S14 and is finally imaged on the imaging surface IMA. Since the fifth lens L5 and the sixth lens L6 are cemented to form a double cemented lens, the second side surface S11 of the fifth lens and the first side surface S11 of the sixth lens are the same surface.

[0267] In this example, the total effective focal length F of the optical lens structure is 2.439 mm, the maximum field of view FOV of the optical lens structure is 180°, and the total track length TTL of the optical lens structure is 19.701 mm.

[0268] In this example, the first side surface S3 of the second lens is configured to be reverse curved, and the second side surface S4 of the second lens is configured to be reverse curved.

[0269] Table 13 shows the basic structure parameter table of the optical lens structure of Example Seven, wherein the units of the radius of curvature Radius and the thickness / distance are millimeters (mm).

[0270]

[0271] ​​ Surf Radius Thickness Nd Vd 1 14.130 1.120 1.80 46.57 2 3.597 2.614 3 -5.286 1.176 1.54 56.11 4 -164.160 1.351 5 -9.611 2.651 1.64 23.53 6 -3.799 -0.250 STO Infinity 0.433 8 11.760 2.390 1.76 52.33 9 -5.601 0.194 10 -50.000 0.550 1.64 23.53 11 1.781 4.317 1.51 56.22 12 -9.136 0.462 13 Infinity 0.900 1.52 64.21 14 Infinity 1.793 IMA / /

[0272] Table 13

[0273] Table 14 shows the high order term coefficients of each aspherical surface in Example Seven, wherein each aspherical surface type can be defined by the formula (1) given in Example One.

[0274]

[0275] Table 14

[0276] Example Eight

[0277] As shown in FIG. 8, an optical lens structure of Example Eight is shown. Figure 8

[0278] As shown in FIG. 8, an optical lens structure of Example Eight is shown. Figure 8

[0279] The first lens L1 has negative refractive power, the first side surface S1 of the first lens is convex, and the second side surface S2 of the first lens is concave. The second lens L2 has negative refractive power, the first side surface S3 of the second lens is concave, and the second side surface S4 of the second lens is convex. The third lens L3 has positive refractive power, the first side surface S5 of the third lens is concave, and the second side surface S6 of the third lens is convex. The fourth lens L4 has positive refractive power, the first side surface S8 of the fourth lens is convex, and the second side surface S9 of the fourth lens is convex. The fifth lens L5 has negative refractive power, the first side surface S10 of the fifth lens is concave, and the second side surface S11 of the fifth lens is concave. The sixth lens L6 has positive refractive power, the first side surface S11 of the sixth lens is convex, and the second side surface S12 of the sixth lens is convex. Light from the first side sequentially passes through the surfaces S1 to S14 and is finally imaged on the image plane IMA. Since the fifth lens L5 and the sixth lens L6 are cemented to form a double cemented lens, the second side surface S11 of the fifth lens and the first side surface S11 of the sixth lens are the same surface.

[0280] In the present example, the total effective focal length F of the optical lens is 2.435 mm, the maximum field of view FOV of the optical lens is 180°, and the total track length TTL of the optical lens is 19.701 mm.

[0281] In the present example, the first side surface S3 of the second lens is configured to be reverse curved, and the second side surface S4 of the second lens is configured to be reverse curved.

[0282] ​​Table 15 shows the basic structure parameter table of the optical lens of Example Eight, wherein the units of the radius of curvature Radius and the thickness Thickness / Distance are millimeter (mm).

[0283] Surf Radius Thickness Nd Vd 1 14.130 1.120 1.80 46.57 2 3.597 2.809 3 -4.613 1.188 1.54 56.11 4 -25.997 1.338 5 -9.335 2.487 1.64 23.53 6 -3.552 -0.250 STO Infinity 0.443 8 11.760 2.390 1.76 52.33 9 -5.650 0.090 10 -30.000 0.550 1.64 23.53 11 1.743 4.382 1.51 56.22 12 -8.656 0.462 13 Infinity 0.900 1.52 64.21 14 Infinity 1.793 IMA / /

[0284] Table 15

[0285] Table 16 shows the high order term coefficients of each aspherical surface in Example Eight, wherein each aspherical surface type can be defined by the formula (1) given in Example One.

[0286]

[0287] Table 16

[0288] In summary, Examples One to Eight respectively satisfy the relationships shown in Table 17.

[0289]

[0290] Table 17

[0291] Table 18 gives the effective focal length F of the optical lens of Examples One to Eight, the effective focal length Fl to F6 of each lens, etc. (unit: millimeter).

[0292]

[0293]

[0294] Table 18

[0295] Obviously, the above described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0296] It should be noted that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0297] It should be noted that the terms "first", "second", and the like, used in the description and in the claims of the present application as well as above-mentioned figures are used to distinguish between similar objects and not necessarily for describing a specific sequential or chronological order. It is to be understood that the use of data so designated is not meant to limit a given item described by such data to the same category as other data designated by the same designations, but instead is so designated only for convenience as a means of discriminating between the two series of items that refer to a same data.

[0298] The preferred embodiments of the application described herein are examples of the present application and are not intended to limit the scope of the application. Various modifications and changes can be made thereto by those skilled in the art which freely adapt to the idea and principles of the application, without departing from the spirit and scope thereof, and it is to be understood that such modifications and changes are to be included within the scope of the application as defined by the appended claims.

Claims

1. An optical lens characterized in that, The total number of lenses of the optical lens is six, sequentially comprising from the first side to the second side: a first lens with negative refractive power, the first side of the first lens is convex, and the second side is concave; a second lens with negative refractive power, the first side of the second lens is concave; a third lens with positive refractive power, the second side of the third lens is convex; a fourth lens with positive refractive power, the second side of the fourth lens is convex; a fifth lens with negative refractive power, the second side of the fifth lens is concave; a sixth lens with positive refractive power, the first side of the sixth lens is convex, and the second side is convex; The radius of curvature R3 of the first side of the second lens and the radius of curvature R2 of the second side of the first lens satisfy: -5.5≤R3 / R2≤-0.05; the total optical length of the optical lens, that is, the distance TTL from the first side center of the first lens of the optical lens to the center of the imaging surface of the optical lens and the total focal length value F of the optical lens satisfy: TTL / F≤9.5; The focal length F1 of the first lens and the focal length F2 of the second lens satisfy: 0.591≤F1 / F2≤5.

2. The optical lens of claim 1, wherein, The second side of the second lens is concave.

3. The optical lens of claim 1, wherein, The second side of the second lens is convex.

4. The optical lens of claim 1, wherein, The first side of the third lens is concave.

5. The optical lens of claim 1, wherein, The first side of the third lens is convex.

6. The optical lens of claim 1, wherein, The first side of the fourth lens is convex.

7. The optical lens of claim 1, wherein, The first side of the fourth lens is concave.

8. The optical lens of claim 1, wherein, The first side of the fifth lens is concave.

9. The optical lens of claim 1, wherein, The first side of the fifth lens is convex.

10. The optical lens of claim 1, wherein, The fifth lens and the sixth lens are cemented to form a double-cemented lens.

11. The optical lens of claim 1, wherein, The second lens, the third lens, the fifth lens and the sixth lens are all aspherical lenses.

12. The optical lens of claim 1, wherein, The second lens and / or the fifth lens are provided with reverse curvature.

13. The optical lens of claim 1, wherein, The optical lens further comprises a diaphragm, The diaphragm is arranged between the third lens and the fourth lens; or The diaphragm is arranged between the fourth lens and the fifth lens.

14. The optical lens of any of claims 1 to 13, wherein, The radius of curvature R3 of the first side of the second lens and the total focal length value F of the optical lens satisfy: -6.850≤R3 / F≤-0.

001.

15. The optical lens of any of claims 1 to 13, wherein, The maximum effective entrance pupil D1 of the first side of the first lens corresponding to the maximum field of view angle of the optical lens and the maximum effective entrance pupil D12 of the second side of the sixth lens corresponding to the maximum field of view angle of the optical lens satisfy: D1 / D12≤3.

5.

16. The optical lens of any of claims 1 to 13, wherein, The relative luminance RI at the maximum image height on an imaging surface of the optical lens and the maximum field of view angle FOV of the optical lens satisfy: 85≤RI*FOV.

17. The optical lens of any of claims 1 to 13, wherein, The Abbe number Vd2 of the second lens and the Abbe number Vd3 of the third lens satisfy: 0.1≤Vd2 / Vd3≤4.

18. The optical lens of any of claims 1 to 13, wherein, The focal length value F56 of the double-cemented lens formed by the fifth lens and the sixth lens and the total focal length value F of the optical lens satisfy: F56 / F≤20.

19. The optical lens of any of claims 1 to 13, wherein, An optical total track length of the optical lens, i.e., a center distance TTL from a first side center of the first lens of the optical lens to an imaging surface of the optical lens and an air gap d4 between the second lens and the third lens satisfy: 4.5≤TTL / d4≤25.

20. The optical lens of any of claims 1 to 13, wherein, A radius of curvature R11 of a first side surface of the sixth lens and a radius of curvature R12 of a second side surface of the sixth lens satisfy: 0.05≤|(R11+R12) / (R11-R12)|≤2.

21. The optical lens of any of claims 1 to 13, wherein, A radius of curvature R5 of a first side surface of the third lens and a radius of curvature R6 of a second side surface of the third lens satisfy: R5 / R6≤15.

22. The optical lens of any of claims 1 to 13, wherein, An entire group focal length value F of the optical lens and a focal length F3 of the third lens satisfy: F3 / F≤15.

23. The optical lens of any of claims 1 to 13, wherein, A maximum field of view FOV of the optical lens, the entire group focal length value F of the optical lens, and an image height H corresponding to the maximum field of view of the optical lens satisfy: 48≤(FOV×F) / H.

24. The optical lens of any of claims 1 to 13, wherein, A sagittal height SAG3 of a first side surface of the second lens and a sagittal height SAG4 of a second side surface of the second lens satisfy: -20≤SAG4 / SAG3≤35.

25. The optical lens of any of claims 1 to 13, wherein, A focal length F1 of the first lens and a focal length F2 of the second lens satisfy: 0.591≤F1 / F2≤2.

26. The optical lens of any of claims 1 to 13, wherein, A maximum effective entrance pupil D1 of a first side surface of the first lens corresponding to the maximum field of view of the optical lens and the entire group focal length value F of the optical lens satisfy: D1 / F≤8.

27. The optical lens of any of claims 1 to 13, wherein, An optical total track length of the optical lens, i.e., a center distance TTL from a first side center of the first lens of the optical lens to an imaging surface of the optical lens and an optical back focal length BFL of the optical lens, i.e., a center distance from a second side center of a last lens of the optical lens to the imaging surface satisfy: 0.197≥BFL / TTL≥0.

1.

28. The optical lens of any of claims 1 to 13, wherein, An optical total track length of the optical lens, i.e., a center distance TTL from a first side center of the first lens of the optical lens to an imaging surface of the optical lens, an image height H corresponding to the maximum field of view of the optical lens, and an arc value θ corresponding to the maximum field of view of the optical lens satisfy: TTL / H / θ≤2.

29. The optical lens of any of claims 1 to 13, wherein, An optical total track length of the optical lens, i.e., a center distance TTL from a first side center of the first lens of the optical lens to an imaging surface of the optical lens and a distance L from a stop to the imaging surface satisfy: TTL / L≤3.

5.

30. The optical lens of any of claims 1 to 13, wherein, A maximum effective entrance pupil D1 of a first side surface of the first lens corresponding to the maximum field of view of the optical lens and a distance L from a stop to the imaging surface satisfy: D1 / L≤2.

2.

31. The optical lens of any of claims 1 to 13, wherein, A center thickness d10 of the fifth lens, a center thickness d11 of the sixth lens, and an optical total track length of the optical lens, i.e., a center distance TTL from a first side center of the first lens of the optical lens to an imaging surface of the optical lens satisfy: (d10+d11) / TTL≤0.

4.

32. The optical lens of any one of claims 1-13, wherein, A radius of curvature R3 of a first side surface of the second lens and a total focal length F of the optical lens satisfy: -6.850≤R3 / F≤-0.05; An optical total length TTL of the optical lens, i.e., a center distance from a first side center of the first lens of the optical lens to an imaging surface of the optical lens and the total focal length F of the optical lens satisfy: 7.833≤TTL / F≤8.5; A maximum effective light aperture D1 of the first side surface of the first lens corresponding to a maximum field of view angle of the optical lens and a maximum effective light aperture D12 of the second side surface of the sixth lens corresponding to the maximum field of view angle of the optical lens satisfy: 2.090≤D1 / D12≤2.8; A relative illumination RI at a maximum image height on an imaging surface of the optical lens and a maximum field of view angle FOV of the optical lens satisfy: 90≤RI*FOV≤111.137; An Abbe number Vd2 of the second lens and an Abbe number Vd3 of the third lens satisfy: 0.5≤Vd2 / Vd3≤2.5; A focal length F56 of a doublet lens formed by the fifth lens and the sixth lens and the total focal length F of the optical lens satisfy: F56 / F≤15; The optical total length TTL of the optical lens, i.e., the center distance from the first side center of the first lens of the optical lens to the imaging surface of the optical lens and an air gap d4 between the second lens and the third lens satisfy: 7.5≤TTL / d4≤18; A radius of curvature R11 of a first side surface of the sixth lens and a radius of curvature R12 of a second side surface of the sixth lens satisfy: 0.2≤|(R11+R12) / (R11-R12)|≤1.2; A radius of curvature R5 of a first side surface of the third lens and a radius of curvature R6 of a second side surface of the third lens satisfy: R5 / R6≤10; The total focal length F of the optical lens and a focal length F3 of the third lens satisfy: 3.118≤F3 / F≤8; The maximum field of view angle FOV of the optical lens, the total focal length F of the optical lens and an image height H corresponding to the maximum field of view angle of the optical lens satisfy: 55≤(FOV×F) / H≤62.555; A sag SAG3 of the first side surface of the second lens and a sag SAG4 of the second side surface of the second lens satisfy: -15≤SAG4 / SAG3≤30; A focal length F1 of the first lens and a focal length F2 of the second lens satisfy: F1 / F2≤2; The maximum effective light aperture D1 of the first side surface of the first lens corresponding to the maximum field of view angle of the optical lens and the total focal length F of the optical lens satisfy: 5.028≤D1 / F≤6; An optical total length of the optical lens, i.e., a center distance TTL from a first side center of the first lens of the optical lens to an imaging surface of the optical lens, and an optical back focal length of the optical lens, i.e., a center distance BFL from a second side center of a last lens of the optical lens to the imaging surface, satisfy: 0.197≥BFL / TTL≥0.15; An optical total length of the optical lens, i.e., a center distance TTL from a first side center of the first lens of the optical lens to an imaging surface of the optical lens, a maximum image height H corresponding to a maximum field of view angle of the optical lens, and an arc value θ corresponding to the maximum field of view angle of the optical lens satisfy: TTL / H / θ≤1; An optical total length of the optical lens, i.e., a center distance TTL from a first side center of the first lens of the optical lens to an imaging surface of the optical lens, and a distance L from a stop to the imaging surface satisfy: TTL / L≤2.5; A maximum effective aperture D1 of a first side of the first lens corresponding to a maximum field of view angle of the optical lens, and a distance L from a stop to the imaging surface satisfy: D1 / L≤1.8; A center thickness d10 of the fifth lens, a center thickness d11 of the sixth lens, and an optical total length of the optical lens, i.e., a center distance TTL from a first side center of the first lens of the optical lens to an imaging surface of the optical lens, satisfy: (d10+d11) / TTL≤0.

3.

33. The optical lens according to any one of claims 1 to 13, wherein A radius of curvature R3 of a first side of the second lens, and a focal length F of the optical lens satisfy: -6.850≤R3 / F≤-1.895; A radius of curvature R3 of a first side of the second lens, and a radius of curvature R2 of a second side of the first lens satisfy: -5.072≤R3 / R2≤-1.282; An optical total length of the optical lens, i.e., a center distance TTL from a first side center of the first lens of the optical lens to an imaging surface of the optical lens, and a focal length F of the optical lens satisfy: 7.833≤TTL / F≤8.147; A maximum effective aperture D1 of a first side of the first lens corresponding to a maximum field of view angle of the optical lens, and a maximum effective aperture D12 of a second side of the sixth lens corresponding to the maximum field of view angle of the optical lens satisfy: 2.090≤D1 / D12≤2.377; A relative illumination RI at a maximum image height on an imaging surface of the optical lens, and a maximum field of view angle FOV of the optical lens satisfy: 97.874≤RI*FOV≤111.137; An Abbe number Vd2 of the second lens, and an Abbe number Vd3 of the third lens satisfy: 1.000≤Vd2 / Vd3≤2.385; A focal length F56 of a doublet lens formed by the fifth lens and the sixth lens, and a focal length F of the optical lens satisfy: -106.552≤F56 / F≤9.840; An optical total track length of the optical lens, i.e., a center distance TTL from a first side center of the first lens of the optical lens to an imaging surface of the optical lens and an air gap d4 between the second lens and the third lens satisfy: 9.696≤TTL / d4≤15.159; A radius of curvature R11 of a first side surface of the sixth lens and a radius of curvature R12 of a second side surface of the sixth lens satisfy: 0.583≤|(R11+R12) / (R11-R12)|≤0.886; A radius of curvature R5 of a first side surface of the third lens and a radius of curvature R6 of a second side surface of the third lens satisfy: -1.632≤R5 / R6≤6.877; An entire group focal length value F of the optical lens and a focal length F3 of the third lens satisfy: 3.118≤F3 / F≤5.953; A maximum field of view FOV of the optical lens, the entire group focal length value F of the optical lens, and an image height H corresponding to the maximum field of view of the optical lens satisfy: 58.353≤(FOV×F) / H≤62.555; A sagittal height SAG3 of a first side surface of the second lens and a sagittal height SAG4 of a second side surface of the second lens satisfy: -13.013≤SAG4 / SAG3≤16.643; A focal length F1 of the first lens and a focal length F2 of the second lens satisfy: 0.591≤F1 / F2≤1.239; A maximum effective entrance pupil D1 of a first side surface of the first lens corresponding to the maximum field of view of the optical lens and the entire group focal length value F of the optical lens satisfy: 5.028≤D1 / F≤5.587; An optical total track length of the optical lens, i.e., a center distance TTL from a first side center of the first lens of the optical lens to an imaging surface of the optical lens and an optical back focal length BFL of the optical lens, i.e., a center distance from a second side center of a last lens of the optical lens to the imaging surface satisfy: 0.197≥BFL / TTL≥0.160; An optical total track length of the optical lens, i.e., a center distance TTL from a first side center of the first lens of the optical lens to an imaging surface of the optical lens, an image height H corresponding to the maximum field of view of the optical lens, and an arc value θ corresponding to the maximum field of view of the optical lens satisfy: 0.837≤TTL / H / θ≤0.872; An optical total track length of the optical lens, i.e., a center distance TTL from a first side center of the first lens of the optical lens to an imaging surface of the optical lens and a distance L from a stop to the imaging surface satisfy: 1.714≤TTL / L≤2.174; A maximum effective entrance pupil D1 of a first side surface of the first lens corresponding to the maximum field of view of the optical lens and a distance L from a stop to the imaging surface satisfy: 1.100≤D1 / L≤1.451; The center thickness d10 of the fifth lens, the center thickness d11 of the sixth lens and the total optical length of the optical lens, i.e. the center distance from the first side of the first lens of the optical lens to the imaging surface of the optical lens TTL satisfy: 0.191≤(d10+d11) / TTL≤0.

250.

34. An electronic device, comprising: An imaging device comprising the optical lens according to any one of claims 1 to 33 and an imaging element for converting an optical image formed by the optical lens into an electric signal.

Images