Optical lens and electronic equipment

Abstract

The utility model discloses an optical lens and electronic equipment, and the optical lens sequentially comprises a first lens with negative focal power from a first side to a second side along an optical axis, and the first side surface and the second side surface of the first lens are a convex surface and a concave surface in sequence; the second lens has negative focal power, and the second side surface of the second lens is a concave surface; the first side surface and the second side surface of the third lens are a convex surface and a concave surface in sequence; the fourth lens has positive focal power, and the first side surface of the fourth lens is a convex surface; the fifth lens has positive focal power, and the first side surface and the second side surface of the fifth lens are convex surfaces; the sixth lens has negative focal power, and the first side surface of the sixth lens is a concave surface; the seventh lens has positive focal power, and the first side surface of the seventh lens is a convex surface; the optical lens satisfies: 5 < = R31 / F < = 20; 3 mm < = T4 * F / T3 < = 11 mm; and 2.6 < = F4 / F < = 3.4.

Description

Technical Field

[0001] The present application relates to the field of optical elements, and more specifically, to an optical lens and an electronic device. Background Art

[0002] In recent years, the concept of smart cars has gradually attracted consumer attention. As a key component for obtaining external information, automotive lenses are increasingly in demand. Automotive lenses generally refer to optical lenses installed in cars to achieve various functions, mainly including interior view lenses, rear view lenses, front view lenses, side view lenses, and surround view lenses.

[0003] Currently, high resolution and a wide field of view are the core competitive qualities of surround-view automotive lenses. However, as an external component of the vehicle, surround-view automotive lenses in assisted driving technology operate in a relatively harsh and complex environment. For example, the sun and oncoming vehicle lights can easily enhance ghost images, resulting in a poor user experience. Utility Model Content

[0004] One advantage of the present application is that it provides an optical lens and electronic device that can improve the clarity and accuracy of imaging while achieving weak ghost images, thereby meeting high resolution requirements.

[0005] In a first aspect, the present application provides an optical lens, comprising, in order from a first side to a second side along an optical axis: a first lens having negative optical power, wherein the first side surface and the second side surface of the first lens are convex and concave surfaces, respectively; a second lens having negative optical power, wherein the second side surface of the second lens is concave; a third lens having negative optical power, wherein the first side surface and the second side surface of the third lens are convex and concave surfaces, respectively; a fourth lens having positive optical power, wherein the first side surface of the fourth lens is convex; a fifth lens having positive optical power, wherein the first side surface and the second side surface of the fifth lens are both convex; a a sixth lens, wherein the first side surface of the sixth lens is concave; a seventh lens having positive optical power, wherein the first side surface of the seventh lens is convex; wherein the number of lenses having optical power in the optical lens is seven; the optical lens satisfies the following conditions: 5≤R31 / F≤20; 3mm≤T4×F / T3≤11mm and 2.6≤F4 / F≤3.4; wherein R31 is the radius of curvature of the first side surface of the third lens; F is the total effective focal length of the optical lens; T4 is the center thickness of the fourth lens on the optical axis; T3 is the center thickness of the third lens on the optical axis; and F4 is the effective focal length of the fourth lens.

[0006] So configured, the optical lens of the present application adopts seven lenses with optical focal length, and is distributed according to negative-negative-negative-positive-positive-negative-positive, and satisfies the conditions 5≤R31 / F≤20; 3mm≤T4×F / T3≤11mm and 2.6≤F4 / F≤3.4; not only the curvature radius of the first side convex surface of the third lens and the total effective focal length of the optical lens are controlled within a reasonable range, so that the focus of the reflected light of the third lens and other lenses is far away from the image plane, thereby reducing the energy of the ghost image; and the third lens and the fourth lens are kept at a large thickness difference, which can compensate for the overall focal length deviation caused by other lenses, and at the same time control the ratio of the effective focal length of the fourth lens to the total effective focal length of the optical lens within a reasonable range, reduce the sensitivity of the fourth lens, thereby ensuring that the entire optical lens can maintain a relatively accurate focal length within different fields of view, which is conducive to improving the clarity and accuracy of imaging and meeting high resolution requirements. It is understandable that if the object surface curvature radius of the third lens is too large or too small, secondary reflection will occur at other lenses, thereby generating ghost images, and making the ghost image focus close to the image plane, resulting in a stronger ghost image capability.

[0007] According to an exemplary embodiment of the present application, the first side surface of the second lens is a convex surface or a concave surface.

[0008] According to an exemplary embodiment of the present application, the second side surface of the fourth lens is a convex surface or a concave surface.

[0009] According to an exemplary embodiment of the present application, the second side surface of the sixth lens is a convex surface or a concave surface.

[0010] According to an exemplary embodiment of the present application, the second side surface of the seventh lens is a convex surface or a concave surface.

[0011] According to an exemplary embodiment of the present application, the first side surface of the third lens has at least one inflection point; the central area of ​​the first side surface of the third lens is convex, and the edge area of ​​the first side surface of the third lens is concave.

[0012] According to an exemplary embodiment of the present application, the fifth lens is cemented with the sixth lens to form a cemented lens.

[0013] According to an exemplary embodiment of the present application, the effective focal length F7 of the seventh lens and the total effective focal length F of the optical lens satisfy: 1≤F7 / F≤3.6.

[0014] According to an exemplary embodiment of the present application, a curvature radius R41 of the first side surface of the fourth lens and a curvature radius R42 of the second side surface of the fourth lens satisfy: 0.3≤|R41 / R42|≤1.2.

[0015] According to an exemplary embodiment of the present application, a curvature radius R31 of the first side surface of the third lens and a curvature radius R32 of the second side surface of the third lens satisfy: 2≤R31 / R32≤5.8.

[0016] According to an exemplary embodiment of the present application, an on-axis distance d34 from the second side surface of the third lens to the first side surface of the fourth lens and a total optical length TTL of the optical lens satisfy: 0≤d34 / TTL≤0.012.

[0017] According to an exemplary embodiment of the present application, the optical lens satisfies: 11.0≤TTL / F≤15.0 and 0.08≤BFL / TTL≤0.3; wherein TTL is the total optical length of the optical lens; F is the total effective focal length of the optical lens; and BFL is the optical back focus of the optical lens.

[0018] According to an exemplary embodiment of the present application, the maximum clear aperture D11 of the first side surface of the first lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy the following conditions: 0.011≤D11 / H / FOV×1°≤0.017.

[0019] According to an exemplary embodiment of the present application, the optical lens satisfies at least one of the following conditional equations: -7≤F1 / F≤-3.5; -3≤F2 / F≤-2; 1.6≤F1 / F2≤2.5 and -1.6≤F12 / F≤-1.2; wherein F1 is the effective focal length of the first lens; F is the total effective focal length of the optical lens; F2 is the effective focal length of the second lens; and F12 is the combined focal length of the first lens and the second lens.

[0020] According to an exemplary embodiment of the present application, the effective focal length F4 of the fourth lens and the effective focal length F7 of the seventh lens satisfy: 0.7≤F4 / F7≤2.3.

[0021] According to an exemplary embodiment of the present application, the optical lens satisfies at least one of the following conditional equations: 2.5≤R11 / R12≤4; 7.5≤R11 / F≤11 and 0.19≤R12 / TTL≤0.24; wherein R11 is the curvature radius of the first side surface of the first lens; R12 is the curvature radius of the second side surface of the first lens; F is the total effective focal length of the optical lens; and TTL is the total optical length of the optical lens.

[0022] According to an exemplary embodiment of the present application, the optical lens satisfies at least one of the following conditional equations: 0.9≤R22 / F≤1.6; 0.85≤R71 / F≤2.3; 2.5≤R32 / F≤4; 0.1≤R41 / TTL≤0.7; 0.12≤R51 / TTL≤0.3; -0.25≤R61 / TTL≤-0.04 and -5≤R51 / R61≤-0.5; wherein, R22 is the radius of curvature of the second side surface of the second lens; F is the total effective focal length of the optical lens; R71 is the radius of curvature of the first side surface of the seventh lens; R32 is the radius of curvature of the second side surface of the third lens; R41 is the radius of curvature of the first side surface of the fourth lens; TTL is the total optical length of the optical lens; R51 is the radius of curvature of the first side surface of the fifth lens; and R61 is the radius of curvature of the first side surface of the sixth lens.

[0023] According to an exemplary embodiment of the present application, the combined focal length F34 of the third lens and the fourth lens and the combined focal length F56 of the fifth lens and the sixth lens satisfy: -1.8≤F34 / F56≤0.8.

[0024] According to an exemplary embodiment of the present application, an axial distance T3-ing from the first side surface of the third lens to the image plane and a total optical length TTL of the optical lens satisfy: 0.4≤T3-ing / TTL≤0.8.

[0025] According to an exemplary embodiment of the present application, the maximum clear aperture D72 of the second side surface of the seventh lens and the image height H corresponding to the maximum field angle of the optical lens satisfy the following: 0.8≤D72 / H≤1.2.

[0026] According to an exemplary embodiment of the present application, the optical lens satisfies at least one of the following conditional equations: 1.3≤F5 / F≤3; -2.2≤F6 / F≤-0.9 and -2.5≤F5 / F6≤-0.5; wherein F5 is the effective focal length of the fifth lens; F is the total effective focal length of the optical lens; and F6 is the effective focal length of the sixth lens.

[0027] According to an exemplary embodiment of the present application, the sum of the center thickness T5 of the fifth lens and the center thickness T6 of the sixth lens on the optical axis and the total optical length of the optical lens satisfy: 0.12≤(T5+T6) / TTL≤0.16.

[0028] According to an exemplary embodiment of the present application, the effective focal length F3 of the third lens and the effective focal length F4 of the fourth lens satisfy: -3.5≤F3 / F4≤-2.

[0029] According to an exemplary embodiment of the present application, the sag height SAG21 of the first side surface of the second lens and the maximum clear aperture D21 of the first side surface of the second lens satisfy: 0.005≤SAG21 / D21≤0.17.

[0030] According to an exemplary embodiment of the present application, the optical lens satisfies at least one of the following conditional equations: -0.1≤SAG0 / SAG31≤2 and |SAG31|≥|SAG0|; wherein SAG0 is the sag height at the inflection point on the first side surface of the third lens; SAG31 is the sag height of the first side surface of the third lens.

[0031] According to an exemplary embodiment of the present application, the effective focal length F3 of the third lens and the total effective focal length F of the optical lens satisfy: -10≤F3 / F≤-6.5.

[0032] According to an exemplary embodiment of the present application, the optical lens satisfies at least one of the following conditional expressions: 2.7≤F4 / F≤3.3; 0.35≤|R41 / R42|≤1.1; 7≤R31 / F≤18; -6.5≤F1 / F≤-4; -2.2≤F5 / F6≤-0.8; 0.1≤BFL / TTL≤0.2; -4.5≤R51 / R61≤-0.65; 0.85≤D72 / H≤1.15; 1.5≤F5 / F≤2.8; -2≤F6 / F≤-1.1; 1.7≤F1 / F2≤2.4; 3≤R11 / R12≤3.4; 0.5≤T3 -ing / TTL≤0.7; 2.6≤R32 / F≤3.85; 0.12≤R41 / TTL≤0.5; 0.14≤R51 / TTL≤0.3; -0.2≤R61 / TTL≤-0.05; -1.5≤F34 / F56≤0.6; 0.01≤SAG21 / D21≤0.1; -0.07≤SAG0 / SAG31≤-0.005 and 3.5mm≤T4×F / T3≤10mm; wherein F4 is the effective focal length of the fourth lens element; F is the total effective focal length of the optical lens; R41 is the radius of curvature of the first side surface of the fourth lens element; R42 is the radius of curvature of the first side surface of the fourth lens element The curvature radius of the second side surface; F7 is the effective focal length of the seventh lens; R31 is the curvature radius of the first side surface of the third lens; F1 is the effective focal length of the first lens; F5 is the effective focal length of the fifth lens; F6 is the effective focal length of the sixth lens; BFL is the optical back focus of the optical lens; TTL is the total optical length of the optical lens; R51 is the curvature radius of the first side surface of the fifth lens; R61 is the curvature radius of the first side surface of the sixth lens; D72 is the maximum clear aperture of the second side surface of the seventh lens; H is the image height corresponding to the maximum field of view of the optical lens; F2 is the effective focal length of the second lens; R11 is the curvature radius of the first side surface of the first lens ; R12 is the radius of curvature of the second side surface of the first lens; T3-ing is the on-axis distance from the first side surface of the third lens to the image plane; R32 is the radius of curvature of the second side surface of the third lens; F34 is the combined focal length of the third lens and the fourth lens; F56 is the combined focal length of the fifth lens and the sixth lens; SAG21 is the sag of the first side surface of the second lens; D21 is the maximum clear aperture of the first side surface of the second lens; SAG0 is the sag at the inflection point on the first side surface of the third lens; SAG31 is the sag of the first side surface of the third lens; T4 is the center thickness of the fourth lens on the optical axis; T3 is the center thickness of the third lens on the optical axis.

[0033] According to an exemplary embodiment of the present application, the optical lens satisfies at least one of the following conditional expressions: 2.775≤F4 / F≤3.205; 0.45≤|R41 / R42|≤0.96; 1.621≤F7 / F≤2.991; -9.005≤F3 / F≤-7.513; 2.96≤R31 / R32≤4.752; 8.505≤R31 / F≤15.022; 0.005≤d34 / TTL≤0.01; 12.551≤TTL / F≤14.02; 0 .013≤D11 / H / FOV×1°≤0.015; -6.158≤F1 / F≤-4.922; -2.954≤F2 / F≤-2.495; -2.013≤F5 / F6≤-1.075; 0.126≤BFL / TTL≤0.152;8.67≤R11 / F≤10.19;0.13≤(T5+T6) / TTL≤0.153;-3.297≤R51 / R61≤-1.001;0.939≤D72 / H≤1.07;1.61 9≤F5 / F≤2.629; -1.824≤F6 / F≤-1.306; 1.769≤F1 / F2≤2.295; 0.97≤F4 / F7≤1.976; 3.113≤R11 / R12≤3.389; 1.099 ≤R22 / F≤1.457; 1.042≤R71 / F≤2.018; 0.589≤T3-ing / TTL≤0.659; 0.208≤R12 / TTL≤0.232; 2.873≤R32 / F≤3.63; 0 .163≤R41 / TTL≤0.417; 0.166≤R51 / TTL≤0.253; -0.175≤R61 / TTL≤-0.075; -1.573≤F12 / F≤-1.372; -1.036≤F34 / F56≤0.268; -3.124≤F3 / F4≤-2.584; 0.022≤SAG21 / D21≤0.08; -0.06≤SAG0 / SAG31≤1.086 and 4.085mm≤T4×F / T3≤9.606mm; where F4 is the effective focal length of the fourth lens; F is the total effective focal length of the optical lens; R41 is the radius of curvature of the first side surface of the fourth lens; R42 is the radius of curvature of the second side surface of the fourth lens; F7 is the effective focal length of the seventh lens; F3 is the effective focal length of the third lens; R31 is the radius of curvature of the first side surface of the third lens; R32 is the radius of curvature of the second side surface of the third lens; d34 is the axial distance from the second side surface of the third lens to the first side surface of the fourth lens; TTL is the total optical length of the optical lens; D11 is the maximum clear aperture of the first side surface of the first lens; H is the image height corresponding to the maximum field of view of the optical lens; FOV is the maximum field of view of the optical lens; F1 is the effective focal length of the first lens; F2 is the effective focal length of the second lens; F5 is the effective focal length of the fifth lens; F6 is the effective focal length of the sixth lens; BFL is the optical back focus of the optical lens; R11 is the radius of curvature of the first side surface of the first lens; T5 is the maximum clear aperture of the fifth lens; The center thickness of the lens on the optical axis; T6 is the center thickness of the sixth lens on the optical axis; R51 is the radius of curvature of the first side surface of the fifth lens; R61 is the radius of curvature of the first side surface of the sixth lens; D72 is the maximum clear aperture of the second side surface of the seventh lens; R12 is the radius of curvature of the second side surface of the first lens; R71 is the radius of curvature of the first side surface of the seventh lens; T3-ing is the on-axis distance from the first side surface of the third lens to the image plane; F12 is the combined focal length of the first and second lenses; F34 is the combined focal length of the third and fourth lenses; F56 is the combined focal length of the fifth and sixth lenses; SAG21 is the sag of the first side surface of the second lens; D21 is the maximum clear aperture of the first side surface of the second lens; SAG0 is the sag at the inflection point on the first side surface of the third lens; SAG31 is the sag of the first side surface of the third lens; T4 is the center thickness of the fourth lens on the optical axis; T3 is the center thickness of the third lens on the optical axis.

[0034] A second aspect of the present application provides an electronic device comprising:

[0035] An optical lens according to any of the above items; and at least one of an imaging element and a light source; wherein the imaging element is located on the second side of the optical lens and is used to convert an optical image or optical information formed by the optical lens into an electrical signal; wherein the light source is located on the second side of the optical lens, and the light emitted by the light source is projected onto the first side of the optical lens after passing through the optical lens, and forms an image or illuminates an area on the first side of the optical lens.

[0036] The third aspect of the present application provides an optical lens, which comprises, in order from the first side to the second side along the optical axis: a first lens with negative optical power, wherein the first side surface and the second side surface of the first lens are convex and concave surfaces respectively; a second lens with negative optical power, wherein the second side surface of the second lens is concave; a third lens with negative optical power, wherein the first side surface and the second side surface of the third lens are convex and concave surfaces respectively; a fourth lens with positive optical power, wherein the first side surface of the fourth lens is convex; a fifth lens with positive optical power, wherein the first side surface and the second side surface of the fifth lens are both convex; a sixth lens with negative optical power, wherein the first side surface of the sixth lens is concave; A seventh lens having positive optical power, wherein the first side surface of the seventh lens is convex; wherein the number of lenses having optical power in the optical lens is seven; the first side surface of the third lens has at least one inflection point; the central area of ​​the first side surface of the third lens is convex, and the edge area of ​​the first side surface of the third lens is concave; the optical lens satisfies: 5≤R31 / F≤20 and -0.1≤SAG0 / SAG31≤2; wherein R31 is the radius of curvature of the first side surface of the third lens; F is the total effective focal length of the optical lens; SAG0 is the sag height at the inflection point on the first side surface of the third lens; and SAG31 is the sag height of the first side surface of the third lens.

[0037] Thus configured, the optical lens of the present application utilizes seven lenses with optical powers distributed in the order of negative-negative-negative-positive-positive-negative-positive, satisfying the conditions 5≤R31 / F≤20 and -0.1≤SAG0 / SAG31≤2. Not only is the radius of curvature of the first convex surface of the third lens element and the total effective focal length of the optical lens controlled within a reasonable range, so that the focus of the reflected light from the third lens element and the other lenses is away from the image plane, thereby reducing the energy of ghost images, but the object curvature of the third lens element is also coordinated with the degree of backcurvature, so that while ghost images are simultaneously reduced, the introduction of backcurvature can effectively eliminate chromatic aberration and better adjust the direction of marginal light, thereby correcting spherical aberration and aberration, ultimately achieving the technical effects of high resolution and low ghost images. It is understood that if the object curvature radius of the third lens element is too large or too small, secondary reflections will occur at the other lenses, thereby generating ghost images, and the focus of the ghost images will be close to the image plane, resulting in a strong ghost image effect.

[0038] The fourth aspect of the present application provides an optical lens, which comprises, in order from the first side to the second side along the optical axis: a first lens having negative optical power, wherein the first side surface and the second side surface of the first lens are convex and concave in sequence; a second lens having negative optical power, wherein the second side surface of the second lens is concave; a third lens having negative optical power, wherein the first side surface and the second side surface of the third lens are convex and concave in sequence; a fourth lens having positive optical power, wherein the first side surface of the fourth lens is convex; a fifth lens having positive optical power, wherein the first side surface and the second side surface of the fifth lens are convex and concave in sequence. Both side surfaces are convex; the sixth lens has negative optical power, and the first side surface of the sixth lens is concave; the seventh lens has positive optical power, and the first side surface of the seventh lens is convex; wherein, the number of lenses with optical power in the optical lens is seven; the optical lens satisfies: 2.6≤F4 / F≤3.4; -10≤F3 / F≤-6.5 and 1≤F7 / F≤3.6; wherein F4 is the effective focal length of the fourth lens; F is the total effective focal length of the optical lens; F3 is the effective focal length of the third lens; and F7 is the effective focal length of the seventh lens.

[0039] With this arrangement, the optical lens of the present application uses seven lenses with optical power, and is distributed according to negative-negative-negative-positive-positive-negative-positive, and satisfies the conditions 2.6≤F4 / F≤3.4; -10≤F3 / F≤-6.5 and 1≤F7 / F≤3.6. In this way, on the one hand, since the first and second lenses in the front are negative lenses, they diverge light to a large extent, and a third lens with a large focal length is required to adjust the light so that it smoothly transitions to the fourth lens. Therefore, the optical lens of the present application maintains the optical power of the fourth lens as positive, reasonably sets the focal length value, and has the effect of converging light, so as to converge the light once, reduce spherical aberration, and improve resolution. It is understandable that if the focal length of the fourth lens is too small, the light convergence effect is enhanced, the deflection phenomenon is obvious, which is not conducive to reducing sensitivity; if the focal length of the fourth lens is too large, although it is beneficial to sensitivity, the light cannot be reasonably converged, which is not conducive to improving performance. On the other hand, because the first, second, and third lenses are all negative lenses, the fourth lens has a high convergence pressure, making it impossible to fully adjust the light in one go. Therefore, the fourth lens of this application is combined with the positive focal power of the seventh lens for secondary convergence adjustment, jointly ensuring that the light reaches the image plane smoothly, thereby improving resolution performance. In other words, the fourth and seventh lenses both have positive focal power and jointly converge the light, allowing the light to reach the image plane smoothly. In addition, the optical lens of this application also simultaneously controls the effective focal lengths of the third, fourth, and seventh lenses within a reasonable range to avoid the problem of poor sensitivity caused by the focal lengths of the fourth and seventh lenses being too small.

[0040] The fifth aspect of the present application provides an optical lens, which includes, from the first side to the second side along the optical axis: a first lens with negative optical power, wherein the first side surface and the second side surface of the first lens are convex and concave surfaces respectively; a second lens with negative optical power, wherein the second side surface of the second lens is concave; a third lens with negative optical power, wherein the first side surface and the second side surface of the third lens are convex and concave surfaces respectively; a fourth lens with positive optical power, wherein the first side surface of the fourth lens is convex; and a fifth lens with positive optical power, wherein the first side surface and the second side surface of the fifth lens are both convex. ; a sixth lens having negative optical power, and a first side surface of the sixth lens is concave; a seventh lens having positive optical power, and a first side surface of the seventh lens is convex; wherein, the number of lenses having optical power in the optical lens is seven; the optical lens satisfies: 2≤R31 / R32≤5 and 0.45≤|R41 / R42|≤1; wherein, R31 is the curvature radius of the first side surface of the third lens; R32 is the curvature radius of the second side surface of the third lens; R41 is the curvature radius of the first side surface of the fourth lens; R42 is the curvature radius of the second side surface of the fourth lens.

[0041] With this arrangement, the optical lens of the present application utilizes seven lenses with optical powers, distributed in a negative-negative-negative-positive-positive-negative-positive pattern, satisfying the conditions 2≤R31 / R32≤5 and 0.45≤|R41 / R42|≤1. This not only rationally controls the curvature ratio of the fourth lens element within a reasonable range, reducing light deflection through the fourth lens element, which is beneficial for reducing sensitivity, but also maintains the focal length ratio of the third lens element within a reasonable range, allowing the light emitted from the second lens element to be redistributed through the third lens element, reducing the angle between the light rays of different fields of view and the optical axis, allowing the light rays to enter the subsequent lens element more smoothly, thereby reducing sensitivity. It is understandable that if the focal length of the third lens element is too large, the light rays emitted from the second lens element will not be well diverged, spherical aberration will not be well corrected, and resolution will be affected. If the focal length of the third lens element is too small, the light rays emitted from the second lens element will diverge too much, resulting in an increase in the aperture of the subsequent lens element, and the fourth lens element will require a larger optical power to refocus the light rays, resulting in poor overall sensitivity. The optical lens of the present application sets the third lens to a convex-concave structure, and at the same time controls the curvature radius of the first side and the second side of the third lens, so that the light deflection on the first side and the second side of the third lens is small, which can reduce the impact of manufacturing tolerances on sensitivity.

[0042] The sixth aspect of the present application provides an optical lens, which includes, from the first side to the second side along the optical axis: a first lens with negative optical power, wherein the first side surface and the second side surface of the first lens are convex and concave surfaces respectively; a second lens with negative optical power, wherein the second side surface of the second lens is concave; a third lens with negative optical power, wherein the first side surface and the second side surface of the third lens are convex and concave surfaces respectively; a fourth lens with positive optical power, wherein the first side surface of the fourth lens is convex; a fifth lens with positive optical power, wherein the first side surface and the second side surface of the fifth lens are both convex; a sixth lens with negative optical power, wherein the first side surface of the sixth lens is concave; a seventh lens with positive optical power, wherein the first side surface of the seventh lens is concave; The first side surface of the optical lens is convex; wherein the number of lenses with optical power in the optical lens is seven; the optical lens satisfies: 8.505≤R31 / F≤15.022; 0.005≤d34 / TTL≤0.01; 10≤TTL / F≤14.02 and 0.01≤D11 / H / FOV×1°≤0.015; wherein d34 is the on-axis distance from the second side surface of the third lens to the first side surface of the fourth lens; TTL is the total optical length of the optical lens; F is the total effective focal length of the optical lens; D11 is the maximum light-clearance diameter of the first side surface of the first lens; H is the image height corresponding to the maximum field of view angle of the optical lens; FOV is the maximum field of view angle of the optical lens.

[0043] With such an arrangement, the optical lens of the present application uses seven lenses with optical focal lengths, and is distributed according to negative-negative-negative-positive-positive-negative-positive, and satisfies the conditions 8.505≤R31 / F≤15.022; 0.005≤d34 / TTL≤0.01; 10≤TTL / F≤14.02 and 0.01≤D11 / H / FOV×1°≤0.015. In this way, on the one hand, the optical lens of the present application reasonably controls the radius of curvature of the central convex surface of the first side of the third lens, so that the focus of the ghost image reflected by the third lens and other lenses is far away from the image plane, so as to reduce the ghost image energy. It can be understood that if the radius of curvature of the central convex surface of the first side of the third lens is too large or too small, secondary reflection will occur at other lenses, thereby generating ghost images and making the ghost image focus close to the image plane, which is not conducive to ghost image improvement. On the other hand, the optical lens of this application not only rationally adjusts its overall optical length to ensure smooth transition of light rays from large object angles to the image plane even at a small aperture, but also reduces the gap between the third and fourth lenses, further achieving miniaturization and a small aperture. It is understandable that if the overall optical length of the optical lens is too short, light deflection will be excessive, resulting in excessive peripheral field aberrations, leading to poor performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Other features, objects and advantages of the present application will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings, in which:

[0045] Figure 1 1 shows a schematic structural diagram of an optical lens according to Example 1 of the present application;

[0046] Figure 2 shows a modulation transfer function (MTF) curve of the optical lens according to Example 1 of the present application;

[0047] Figure 3 1 shows a schematic structural diagram of an optical lens according to Example 2 of the present application;

[0048] Figure 4 shows a modulation transfer function curve of the optical lens according to Example 2 of the present application;

[0049] Figure 5 1 shows a schematic structural diagram of an optical lens according to Example 3 of the present application;

[0050] Figure 6 shows a modulation transfer function curve of the optical lens according to Example 3 of the present application;

[0051] Figure 7 1 shows a schematic structural diagram of an optical lens according to Example 4 of the present application;

[0052] Figure 8 shows a modulation transfer function curve of the optical lens according to Example 4 of the present application;

[0053] Figure 9 1 shows a schematic structural diagram of an optical lens according to Example 5 of the present application;

[0054] Figure 10 shows a modulation transfer function curve of the optical lens according to Example 5 of the present application;

[0055] Figure 11 1 shows a schematic structural diagram of an optical lens according to Example 6 of the present application;

[0056] Figure 12 shows a modulation transfer function curve of the optical lens according to Example 6 of the present application;

[0057] Figure 13 1 shows a schematic structural diagram of an optical lens according to Example 7 of the present application;

[0058] Figure 14 shows a modulation transfer function curve of the optical lens according to Example 7 of the present application;

[0059] Figure 151 shows a schematic structural diagram of an optical lens according to Example 8 of the present application;

[0060] Figure 16 shows a modulation transfer function curve of the optical lens according to Example 8 of the present application;

[0061] Figure 17 1 shows a schematic structural diagram of an optical lens according to Example 9 of the present application;

[0062] Figure 18 shows a modulation transfer function curve of the optical lens according to Example 9 of the present application;

[0063] Figure 19 1 shows a schematic structural diagram of an optical lens according to Example 10 of the present application;

[0064] Figure 20 shows a modulation transfer function curve of the optical lens according to Example 10 of the present application;

[0065] Figure 21 A schematic diagram of ghost image rays of the optical lens according to the present application is shown, wherein the third lens has a convex-concave structure;

[0066] Figure 22 Shown Figure 21 Schematic diagram of ghost image simulation of the optical lens shown;

[0067] Figure 23 A schematic diagram of ghost image rays of an optical lens of a comparative example is shown, wherein the third lens has a concave-concave structure;

[0068] Figure 24 Shown Figure 23 Schematic diagram of ghost image simulation of the optical lens shown. DETAILED DESCRIPTION

[0069] In order to better understand the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely descriptions of exemplary embodiments of the present application and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements.

[0070] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of this application.

[0071] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0072] In this document, the paraxial region refers to the area near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the location of the concave surface is undefined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the first side is called the first side surface of the lens, and the surface of each lens closest to the second side is called the second side surface of the lens.

[0073] It should also be understood that the terms "comprising," "including," and / or "having," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when describing embodiments of the present application, the term "may" is used to indicate "one or more embodiments of the present application." Furthermore, the term "exemplary" is intended to refer to an example or illustration.

[0074] Unless otherwise specified, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by persons of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having meanings consistent with their meanings in the context of the relevant technology and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein. It should be noted that, unless there is a conflict, the embodiments and features described in the embodiments of this application may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0075] The features, principles and other aspects of the present application are described in detail below.

[0076] According to an exemplary embodiment of the present application, the optical lens may include, for example, seven lenses having optical power, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, and the seven lenses are arranged in sequence from the first side to the second side along the optical axis.

[0077] In an exemplary embodiment, the optical lens provided in the present application can be used as a light receiving lens or a light emitting lens, wherein: the light receiving lens is generally used to collect light from the object side space, and the collected light is used to form detection information, including but not limited to imaging, laser point cloud, etc.; the light emitting lens is generally used to transmit light from the light emitting unit to the object side space, and according to the function of the light, the light transmitted to the object side space can be divided into projection light for forming a projection image or detection light for detecting target object information, etc.

[0078] It is understood that when the optical lens provided in this application is used for a light receiving lens such as a camera lens, a laser radar receiving end lens, a microscope lens, or a telephoto lens, the "first side" referred to herein may refer to the object side, and the "second side" may refer to the image side (such as the side where the photoelectric sensor or retina is located), that is, light from the object side can be imaged on the image side via the optical lens, wherein the camera lens can be, for example, a vehicle-mounted camera, an infrared camera, a drone camera, a night vision camera, a security monitoring camera, etc. When the optical lens provided in this application is used for a light emitting lens such as a projection lens or a laser radar transmitting end lens, the "first side" referred to herein may refer to the object side, and the "second side" may refer to the light source side, that is, light from the light source side can be projected onto the object side via the optical lens.

[0079] In an exemplary embodiment, the first lens may have a negative optical focal length, and its first side surface may be implemented as a convex surface, and the second side surface may be implemented as a concave surface. The first lens is a negative lens, which has a divergent effect on light, and the first side surface is set as a convex surface facing the object side, which can effectively compress the incident angle of the light, which is conducive to collecting as much light as possible into the system, thereby achieving large field angle imaging; at the same time, the first side surface of the first lens is set as a convex surface, which is conducive to the sliding of water droplets in practical applications, and reduces the impact of external environments such as water droplets on imaging quality. In addition, the second side surface of the first lens is set as a concave surface, which can collect as much large field of view light as possible and make it smoothly enter the rear system, and control the trend of large-angle light at the edge. It can be understood that the first lens can be made of a high refractive index material, such as glass, which is conducive to compressing the incident angle of light, reducing the front port diameter of the optical lens, and improving imaging quality.

[0080] In an exemplary embodiment, the second lens may have a negative optical power, and its first side surface may be implemented as a convex surface, and the second side surface may be implemented as a concave surface. The second lens is a negative lens, which can collect the light entering through the first lens, reduce the angle between the large-angle light and the optical axis, and is conducive to the miniaturization of subsequent lenses and further reduction of the front port diameter. The first side surface of the second lens is set to a convex surface, which can further converge the light after the first lens, assist the first lens in converging the large-angle light, and facilitate the reduction of the diameter of the subsequent lens. The second side surface of the second lens is set to a concave surface, which can smoothly receive the light emitted by the first lens, which is conducive to the distribution of the angle between the internal and external field of view light and the optical axis, and is conducive to improving angular resolution and performance.

[0081] In an exemplary embodiment, the second lens may have a negative optical focal length, and its first side surface may be implemented as a concave surface, and the second side surface may be implemented as a concave surface. The second lens is a negative lens, which can collect light entering through the first lens, reduce the angle between the large-angle light and the optical axis, and is conducive to the miniaturization of subsequent lenses and further reduction of the front port diameter. The first side surface of the second lens is set as a concave surface, which can slow down the convergence ability of the first side surface of the second lens on light, and facilitate the distribution of light from different fields of view on the subsequent lens; at the same time, the concave surface can also reduce the ghost image reflected between the second lens and the first lens. The second side surface of the second lens is set as a concave surface, which can smoothly receive the light emitted by the first lens, which is conducive to the distribution of the angles between the internal and external field of view light and the optical axis, and is conducive to improving angular resolution and performance.

[0082] In an exemplary embodiment, the third lens may have negative optical power, and its first side surface may be convex, while its second side surface may be concave. As a negative lens, the third lens can collect light emitted by the second lens and adjust the degree of light convergence between the first and second lenses, ensuring a smooth transition of light paths and improving image resolution. The third lens's first side surface is convex, while its second side surface is concave, so that light first converges on the first side surface of the third lens and then diverges on the second side surface of the third lens, which helps reduce spherical aberration and improves the resolution of the optical lens.

[0083] In an exemplary embodiment, the fourth lens may have positive optical power, and its first side surface may be implemented as a convex surface, and its second side surface may be implemented as a convex surface. The fourth lens is a positive lens, which is conducive to properly converging the light emitted from the third lens. The shape of the fourth lens is biconvex and the lens shape is flat, which can further converge the light, facilitate smooth entry into the rear system, and help reduce the sensitivity of the lens. The first side surface of the fourth lens is set as a convex surface, which cooperates with the negative optical power of the third lens to re-converge the divergent light; at the same time, the first side convex surface of the fourth lens matches the second side concave surface of the third lens, which can reduce the gap between the third lens and the fourth lens, and help reduce the total optical length of the optical lens to achieve miniaturization.

[0084] In an exemplary embodiment, the fourth lens element may have positive optical power, with its first side surface being convex and its second side surface being concave. The concave second side surface of the fourth lens element further diverges light, facilitating subsequent light rays to reach a greater image height. Furthermore, the concave second side surface of the fourth lens element also increases light at the edge of the field of view, improving the relative illumination of the optical lens.

[0085] In an exemplary embodiment, the fifth lens and the sixth lens are cemented together to form a cemented lens. The fifth lens and the sixth lens have opposite positive and negative optical power properties, which can ensure a smooth transition of light to the rear system. The light has almost the same trajectory on the second side surface of the fifth lens and the first side surface of the sixth lens without obvious deflection. Therefore, the sixth lens can smoothly receive the light emitted by the fifth lens, reducing the light loss caused by reflection between lenses and effectively improving the relative illumination of each field of view. In addition, the field curvature is reduced and the off-axis aberration of the optical lens is corrected. The cemented lens can also fully correct various aberrations of the optical system, improve the resolution, and optimize optical properties such as distortion and CRA (Chief Ray Angle) while maintaining a compact structure.

[0086] In an exemplary embodiment, the fifth lens element may have positive optical power, and its first and second side surfaces may be convex. The fifth lens element is a positive, biconvex lens. It collects light emitted by the fourth lens element, further converging it and adjusting the optical path difference between light rays from different fields of view, paving the way for subsequent light rays to converge onto the image plane.

[0087] In an exemplary embodiment, the sixth lens element may have negative optical power, with its first and second side surfaces being concave. The sixth lens element is a negative, biconcave lens, which, in conjunction with the positive optical power of the fifth lens element, adjusts the deflection of light rays in the inner and outer fields of view, thereby improving the convergence of light rays in the outer field of view at the image plane and reducing coma. Furthermore, the sixth lens element forms a cemented structure with the fifth lens element, making the overall optical system compact and meeting miniaturization requirements. This also reduces sensitivity to tolerances such as tilt and decentering that can occur during the lens unit assembly process.

[0088] In an exemplary embodiment, the sixth lens element may have negative optical power, with its first side surface being concave and its second side surface being convex. The sixth lens element is a negative lens element, with its second side surface being convex, further converging light, thereby coordinating the convergence of light with the positive optical power of the seventh lens element, resulting in a smoother light transition. Furthermore, the second convex surface of the sixth lens element matches the first convex surface of the seventh lens element, reducing ghost image energy reflected between the sixth and seventh lenses.

[0089] In an exemplary embodiment, the seventh lens element may have positive optical power, with its first and second side surfaces being convex. The seventh lens element is a positive, biconvex lens, which facilitates correction of aberrations such as spherical aberration and coma, while also improving distortion and chief ray angle (CRA). Furthermore, the convex first surface of the seventh lens element, when combined with the concave second surface of the sixth lens element, reduces the gap between the sixth and seventh lenses, effectively shortening the overall optical length and enabling miniaturization of the optical lens.

[0090] In an exemplary embodiment, the seventh lens element may have positive optical power, with its first side surface being convex and its second side surface being concave. The seventh lens element is a positive lens element with a concave second side surface. This further diverges the outer field of view light, facilitating a larger image height and providing some correction for coma. Furthermore, the concave second side surface of the seventh lens element has a low sag height, facilitating a thinner seventh lens element, thereby reducing the overall optical length or increasing the optical back focus.

[0091] In an exemplary embodiment, the optical lens may further include an aperture, which may be positioned between the fourth and fifth lenses. This placement of the aperture between the fourth and fifth lenses facilitates effective convergence of light entering the optical system, reduces the lens aperture at the front end of the optical system, and lowers the system's assembly sensitivity. It should be understood that positioning the aperture between the fourth and fifth lenses is merely exemplary and is not a specific limitation in this application. The aperture may be positioned elsewhere as needed.

[0092] In an exemplary embodiment, the surfaces of the second, third, sixth, and seventh lenses may have at least one inflection point. This arrangement can change the deflection of central and peripheral rays on the same surface, allowing them to better converge onto the image plane, effectively reducing aberrations such as spherical aberration, coma, and field curvature, and improving resolution.

[0093] In an exemplary embodiment, the first side surface of the third lens has at least one inflection point; the central area of ​​the first side surface of the third lens is configured as a convex surface, which can effectively reduce the intensity of ghost images reflected from other lenses; the edge area of ​​the first side surface of the third lens is configured as a concave surface, which facilitates adjustment of the angle between the edge field of view light and the optical axis.

[0094] In an exemplary embodiment, the surfaces of the second lens, the third lens, the fifth lens, the sixth lens, and the seventh lens may have one or more aspherical surfaces, which can reasonably control the deflection of light in each field of view, effectively reduce various aberrations such as spherical aberration, coma, and distortion, and improve the performance of the optical lens.

[0095] In an exemplary embodiment, the optical lens may further include a filter positioned between the seventh lens element and the image plane to filter light of different wavelengths. If desired, the optical lens may also include a protective glass between the filter and the image plane to prevent damage to internal components (e.g., chips) within the optical lens.

[0096] In an exemplary embodiment, the optical lens may further include a photosensitive element / imaging element disposed on the second side. Optionally, the photosensitive element / imaging element disposed on the second side may be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS).

[0097] In an exemplary embodiment, the radius of curvature R31 of the first side surface of the third lens and the total effective focal length F of the optical lens can satisfy the following relationship: 5≤R31 / F≤20. Preferably, 7≤R31 / F≤18. Furthermore, 8.505≤R31 / F≤15.022. By controlling this conditional expression, the focus of the ghost image reflected by the third lens and other lenses is moved away from the image plane, thereby reducing the energy of the ghost image. It is understandable that if the radius of curvature of the first side of the third lens is too large or too small, secondary reflection will occur at the other lenses, thereby generating ghost images and making the ghost image focus close to the image plane, which is not conducive to ghost image improvement.

[0098] It is worth noting that the combination of the conditional formula R31 / F and other conditional formulas F3 / F and R31 / R32 can make the shape of the third lens smoother and not strongly deflect the light, so as to achieve low ghost images while meeting the requirements of high resolution and low sensitivity. Figure 21 and Figure 23As shown, the reason why the optical lens structure of the present application produces ghost images is usually that light is first reflected by the color filter to the first side surface of the third lens, and then reflected to the image plane, making the ghost images reflected by the first side surface of the third lens and the color filter the most obvious; therefore, the optical lens of the present application needs to take into account both ghost images and performance. Figure 23 and Figure 24 It is easy to see from the ghost image simulation diagram shown that: when R31 / F is smaller, such as R31 / F<5, the optical focus of the secondary reflection is far away from the image plane, the ghost image spot is larger, the ghost image energy is more dispersed, the actual ghost image is weaker, but the resolution will become worse; when R31 / F is larger, such as R31 / F>20 or infinity, the optical focus of the secondary reflection is close to the image plane, the ghost image spot is smaller, the ghost image energy is more concentrated, and the actual ghost image is stronger. Figure 21 and Figure 22 As shown, the optical lens of the present application achieves good low ghost image and high resolution effects by strictly keeping the first side surface of the third lens as a convex surface and controlling the value of the curvature radius R31 of the first side surface of the third lens.

[0099] In an exemplary embodiment, the center thickness T4 of the fourth lens on the optical axis, the total effective focal length F of the optical lens, and the center thickness T3 of the third lens on the optical axis can satisfy the following conditions: 3mm ≤ T4 × F / T3 ≤ 11mm. Preferably, 3.5mm ≤ T4 × F / T3 ≤ 10mm. Furthermore, 4.085mm ≤ T4 × F / T3 ≤ 9.606mm. By controlling this conditional expression, the thickness difference between the fourth lens and the third lens can be maintained at a large level, compensating for the overall focal length deviation caused by the other lenses. This allows the entire lens system to maintain a relatively accurate focal length across different fields of view, improving imaging clarity and accuracy.

[0100] In an exemplary embodiment, the effective focal length F7 of the seventh lens and the total effective focal length F of the optical lens satisfy: 1≤F7 / F≤3.6. Preferably, 1.621≤F7 / F≤2.991. By controlling this conditional expression, the positive focal length of the seventh lens is controlled to further reduce the sensitivity while ensuring that the lens has good light convergence ability. It is understandable that if the focal length of the seventh lens is too small, such as F7 / F<1, it is easy to cause the central field of view light to converge within the image plane and the edge field of view light to converge outside the image plane, thereby forming a field area and reducing the resolution; and if the focal length of the seventh lens is too large, such as F7 / F>3.6, the seventh lens's light convergence ability is insufficient, and the fourth lens needs to have a larger optical power, which is not conducive to overall sensitivity. In addition, the combination of this conditional expression F7 / F and other conditional expressions F4 / F can ensure that both the fourth lens and the seventh lens have positive optical power, which facilitates the convergence of edge light, helps reduce spherical aberration, and improves lens performance.

[0101] In an exemplary embodiment, the radius of curvature R41 of the first side surface of the fourth lens and the radius of curvature R42 of the second side surface of the fourth lens satisfy: 0.3≤|R41 / R42|≤1.2. Preferably, 0.35≤|R41 / R42|≤1.1. Further, 0.45≤|R41 / R42|≤0.96. By controlling this conditional expression, the ratio of the radius of curvature of the first side and the second side surface of the fourth lens is controlled to be close, which is conducive to reducing the deflection of light passing through the fourth lens. It can be understood that if the ratio |R41 / R42| is too large or too small, the radius of curvature of one side surface will be too large, and the light will not be significantly deflected, but the radius of curvature of the other side surface will be too small, the light will be significantly deflected, and the sensitivity will be poor. In addition, this conditional expression |R41 / R42| is combined with the conditional expression F4 / F to achieve a small focal length lens and reduce sensitivity.

[0102] In an exemplary embodiment, the radius of curvature R31 of the first side surface of the third lens and the radius of curvature R32 of the second side surface of the third lens satisfy the following relationship: 2 ≤ R31 / R32 ≤ 5.8. Preferably, 2.96 ≤ R31 / R32 ≤ 4.752. By controlling this conditional expression, the ratio of the radius of curvature of the first and second side surfaces of the third lens is kept close, effectively distributing the light deflection effect and facilitating a smooth transition of light. It is understood that if the ratio R31 / R32 is too large, the radius of curvature of the first side of the third lens will be larger, resulting in no significant deflection of light emitted from the second lens, while the radius of curvature of the second side surface of the third lens will be smaller, requiring greater light deflection, which is detrimental to reduced sensitivity. The opposite is also true. Furthermore, this conditional expression R31 / R32, combined with the conditional expression |R41 / R42|, allows light rays with a large field of view, which passes through the first and second lenses, to transition smoothly through the third and fourth lenses before entering the subsequent lenses, reducing coma and improving resolution and sensitivity.

[0103] In an exemplary embodiment, the effective focal length F4 of the fourth lens and the total effective focal length F of the optical lens satisfy: 2.6≤F4 / F≤3.4. Preferably, 2.7≤F4 / F≤3.3. Further, 2.775≤F4 / F≤3.205. By controlling this conditional expression, the ratio of the effective focal length of the fourth lens to the total effective focal length of the optical lens is controlled to be within a reasonable range, thereby reducing the sensitivity of the fourth lens. It is understandable that if the ratio F4 / F is too small, the fourth lens has a stronger ability to deflect light, resulting in a greater impact of tolerance fluctuations; if the ratio F4 / F is too large, the fourth lens has insufficient optical convergence ability, and more lenses are required to compensate, which is not conducive to miniaturization. In addition, the combination of the conditional expression F4 / F and the conditional expression TTL / F can achieve a result in which a small focal length lens and a small optical assembly complement each other.

[0104] In an exemplary embodiment, the on-axis distance d34 from the second side surface of the third lens to the first side surface of the fourth lens and the total optical length TTL of the optical lens satisfy the following conditions: 0≤d34 / TTL≤0.012. Preferably, 0.005≤d34 / TTL≤0.01. By controlling this conditional expression, the gap between the third lens and the fourth lens is reduced, which is conducive to achieving a short total optical length. It can be understood that if the gap is too large, it is not conducive to achieving a small total optical length; if the gap is too small, it is not conducive to lens assembly. In addition, the conditional expression d34 / TTL combined with the conditional expression R31 / F can not only structurally facilitate the reduction of the gap between the third lens and the fourth lens, but also make the light transition smooth, which is conducive to improving the resolution.

[0105] In an exemplary embodiment, the total optical length TTL of the optical lens and the total effective focal length F of the optical lens satisfy: 11≤TTL / F≤15. Preferably, 12.551≤TTL / F≤14.02. By controlling this conditional expression, the miniaturization of the optical lens is achieved while ensuring a small focal length of the wide-angle lens. It is understandable that if the total optical length TTL is too small, although it is conducive to miniaturization, the overall system does not have enough optical path, resulting in obvious light deflection and poor correction of aberrations, thereby affecting resolution and sensitivity; if the total optical length TTL is too large, it does not conform to the trend of miniaturization. In addition, the conditional expression TTL / F is combined with the conditional expressions F4 / F and F7 / F to ensure that the fourth lens and the seventh lens both have positive focal power, and the converged light is conducive to the realization of a small total optical length.

[0106] In an exemplary embodiment, the optical back focus (BFL) of the optical lens and the total optical length (TTL) of the optical lens satisfy the following relationship: 0.08 ≤ BFL / TTL ≤ 0.3. Preferably, 0.1 ≤ BFL / TTL ≤ 0.2. Furthermore, 0.126 ≤ BFL / TTL ≤ 0.152. By controlling this conditional equation, the back focus length facilitates assembly of the optical lens while achieving miniaturization.

[0107] In an exemplary embodiment, the maximum clear aperture D11 of the first side surface of the first lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy the following conditions: 0.011 ≤ D11 / H / FOV × 1° ≤ 0.017. Preferably, 0.013 ≤ D11 / H / FOV × 1° ≤ 0.015. By controlling this conditional expression, the front port diameter of the first lens can be controlled at the same ratio of object angle to image height, thereby achieving a small aperture. It is understood that if the front port diameter of the first lens is too small, incident light from the center and periphery of the field of view is more concentrated, requiring a smaller radius of curvature on the first side of the first lens to receive light from the periphery, which is detrimental to sensitivity. If the front port diameter of the first lens is too large, the requirement for a small aperture is not met. Furthermore, the conditional expression D11 / H / FOV, combined with the conditional expression TTL / F, effectively allocates the total optical length, ensuring that central light rays can smoothly reach the image plane while also ensuring that light from the outer field of view has sufficient optical path length to reach the desired image height at a small aperture.

[0108] In an exemplary embodiment, the effective focal length F1 of the first lens and the total effective focal length F of the optical lens satisfy the following equation: -7 ≤ F1 / F ≤ -3.5. Preferably, -6.5 ≤ F1 / F ≤ -4. Furthermore, -6.158 ≤ F1 / F ≤ -4.922. By controlling this conditional equation, the focal length of the first lens is kept small, facilitating the collection of light over a wide field of view and achieving a wide angle of view.

[0109] In an exemplary embodiment, the effective focal length F2 of the second lens and the total effective focal length F of the optical lens satisfy the following relationship: -3 ≤ F2 / F ≤ -2. Preferably, -2.954 ≤ F2 / F ≤ -2.495. By controlling this conditional equation, the focal length of the second lens can be appropriately set to coordinate with the conditional equation F1 / F, allowing light from the first lens to flow smoothly into subsequent lenses. It is understood that if the focal length of the second lens is too large or too small, it will result in excessive light deflection, which is detrimental to overall performance.

[0110] In an exemplary embodiment, the effective focal length F1 of the first lens and the effective focal length F2 of the second lens satisfy the following conditions: 1.6 ≤ F1 / F2 ≤ 2.5. Preferably, 1.7 ≤ F1 / F2 ≤ 2.4. Furthermore, 1.769 ≤ F1 / F2 ≤ 2.295. By controlling this conditional expression, light with a wide field of view can enter smoothly. After passing through the first and second lenses, the angle between the light and the optical axis is reduced, thereby achieving a wide field of view.

[0111] In an exemplary embodiment, the combined focal length F12 of the first and second lenses satisfies the following equation: -1.6 ≤ F12 / F ≤ -1.2. Preferably, -1.573 ≤ F12 / F ≤ -1.372. By controlling this conditional equation, the combined focal length of the first and second lenses is negative, which helps compress light rays with a large field of view into a smaller field of view after entering the system, thereby reducing chromatic aberration between different fields of view.

[0112] In an exemplary embodiment, the effective focal length F4 of the fourth lens and the effective focal length F7 of the seventh lens satisfy: 0.7≤F4 / F7≤2.3. Preferably, 0.97≤F4 / F7≤1.976. By controlling this conditional expression, the ratio of the effective focal length of the fourth lens to the total effective focal length of the optical lens is controlled within a reasonable range, thereby reducing the sensitivity of the lens. It is understandable that if the ratio F4 / F7 is too small, the fourth lens has a stronger ability to deflect light, resulting in a greater impact of tolerance fluctuations; if the ratio F4 / F7 is too large, the fourth lens has insufficient optical convergence ability, and more lenses are required to compensate, which is not conducive to miniaturization. In addition, the combination of the conditional expression F4 / F7 and the conditional expression TTL / F can achieve a complementary result of small focal length lenses and small total optical length.

[0113] In an exemplary embodiment, the radius of curvature R11 of the first side surface of the first lens and the radius of curvature R12 of the second side surface of the first lens satisfy the following conditions: 2.5≤R11 / R12≤4. Preferably, 3≤R11 / R12≤3.4. Furthermore, 3.113≤R11 / R12≤3.389. By controlling this conditional expression, not only is the first lens ensured to have a convex-concave structure, but the radii of curvature of both sides are relatively small, which is beneficial for receiving light with a large field of view and achieving a small aperture; the surface curvature radii of the first and second sides are also reasonably distributed, so that light with a large field of view is segmented and better enters the subsequent lens.

[0114] In an exemplary embodiment, the radius of curvature R11 of the first side surface of the first lens and the total effective focal length F of the optical lens satisfy the following equation: 7.5 ≤ R11 / F ≤ 11. Preferably, 8.67 ≤ R11 / F ≤ 10.19. By controlling this conditional equation, adjusting the radius of curvature of the first side surface of the first lens facilitates light collection at a wide field of view, reduces the angle between subsequent light rays and the optical axis, and improves peripheral resolution.

[0115] In an exemplary embodiment, the radius of curvature R12 of the second side surface of the first lens and the total optical length TTL of the optical lens satisfy the following equation: 0.19 ≤ R12 / TTL ≤ 0.24. Preferably, 0.208 ≤ R12 / TTL ≤ 0.232. By controlling this conditional equation, the radius of curvature of the second concave side surface of the first lens is optimally set, resulting in secondary convergence of light incident through the first side surface of the first lens, thereby achieving miniaturization and a small aperture.

[0116] In an exemplary embodiment, the radius of curvature R22 of the second side surface of the second lens element and the total effective focal length F of the optical lens satisfy the following equation: 0.9 ≤ R22 / F ≤ 1.6. Preferably, 1.099 ≤ R22 / F ≤ 1.457. By controlling this conditional equation, the radius of curvature of the second concave side surface of the second lens element is kept small, thereby providing a strong deflection effect on external field light, thereby achieving a small aperture in conjunction with the first lens element.

[0117] In an exemplary embodiment, the radius of curvature R71 of the first side surface of the seventh lens and the total effective focal length F of the optical lens satisfy the following relationship: 0.85≤R71 / F≤2.3. Preferably, 1.042≤R71 / F≤2.018. By controlling this conditional expression, not only can the light be converged on the image plane through the first side convex surface of the seventh lens, but the smaller radius of curvature of the first side convex surface is conducive to miniaturization, and it also has a certain corrective effect on spherical aberration, which is conducive to improving the resolution. It can be understood that if the radius of curvature of the first side convex surface of the seventh lens is too large, the light needs a greater distance to converge on the image plane, which is not conducive to shortening the total optical length; if the radius of curvature of the first side convex surface of the seventh lens is too small, although the central light has converged, the edge light has not yet converged well, thereby affecting the resolution.

[0118] In an exemplary embodiment, the radius of curvature R32 of the second side surface of the third lens element and the total effective focal length F of the optical lens satisfy the following relationship: 2.5 ≤ R32 / F ≤ 4. Preferably, 2.6 ≤ R32 / F ≤ 3.85. Furthermore, 2.873 ≤ R32 / F ≤ 3.63. By controlling this conditional expression and appropriately setting the radius of curvature of the second side surface of the third lens element, light rays emitted from the first and second lenses transition more smoothly to the fourth lens element, thereby reducing spherical aberration and improving resolution.

[0119] In an exemplary embodiment, the radius of curvature R41 of the first side surface of the fourth lens element and the total optical length TTL of the optical lens satisfy the following relationship: 0.1 ≤ R41 / TTL ≤ 0.7. Preferably, 0.12 ≤ R41 / TTL ≤ 0.5. Furthermore, 0.163 ≤ R41 / TTL ≤ 0.417. By controlling this conditional equation, the first convex surface of the fourth lens element converges light while cooperating with the concave image surface of the third lens element, facilitating a reduction in the air gap between the third and fourth lenses, thereby further reducing the total optical length.

[0120] In an exemplary embodiment, the radius of curvature R51 of the first side surface of the fifth lens element and the total optical length TTL of the optical lens element satisfy the following relationship: 0.12 ≤ R51 / TTL ≤ 0.3. Preferably, 0.14 ≤ R51 / TTL ≤ 0.3. Furthermore, 0.166 ≤ R51 / TTL ≤ 0.253. By controlling this conditional expression, the first convex surface of the fifth lens element can further converge peripheral field light, thereby reducing coma and improving resolution.

[0121] In an exemplary embodiment, the radius of curvature R61 of the first side surface of the sixth lens element and the total optical length TTL of the optical lens satisfy the following relationship: -0.25 ≤ R61 / TTL ≤ -0.04. Preferably, -0.2 ≤ R61 / TTL ≤ -0.05. Furthermore, -0.175 ≤ R61 / TTL ≤ -0.075. By controlling this conditional expression, light rays from the peripheral field of view are appropriately deflected, entering the image plane at a smaller angle of incidence, thereby improving relative illumination.

[0122] In an exemplary embodiment, the radius of curvature R51 of the first side surface of the fifth lens element and the radius of curvature R61 of the first side surface of the sixth lens element satisfy the following conditions: -5 ≤ R51 / R61 ≤ -0.5. Preferably, -4.5 ≤ R51 / R61 ≤ -0.65. Furthermore, -3.297 ≤ R51 / R61 ≤ -1.001. By controlling this conditional expression, the deflection of light within the cemented element can be effectively adjusted, ensuring that external field light reaches the designed image height smoothly, minimizing distortion.

[0123] In an exemplary embodiment, the combined focal length F34 of the third and fourth lenses and the combined focal length F56 of the fifth and sixth lenses satisfy the following: -1.8 ≤ F34 / F56 ≤ 0.8. Preferably, -1.5 ≤ F34 / F56 ≤ 0.6. Furthermore, -1.036 ≤ F34 / F56 ≤ 0.268. By controlling this conditional equation, light transmitted through the front lens group, after being conditioned by the third and fourth lenses, transitions to the cemented member of the fifth and sixth lenses, and then smoothly to the seventh lens. This multiple transition pattern improves the system's resolution.

[0124] In an exemplary embodiment, the on-axis distance T3-ing from the first side surface of the third lens to the image plane and the total optical length TTL of the optical lens satisfy the following relationship: 0.4 ≤ T3-ing / TTL ≤ 0.8. Preferably, 0.5 ≤ T3-ing / TTL ≤ 0.7. Furthermore, 0.589 ≤ T3-ing / TTL ≤ 0.659. By controlling this conditional expression, the optical path difference caused by secondary reflection between the third lens and other lenses can be adjusted, thereby reducing the energy of ghost images.

[0125] In an exemplary embodiment, the maximum clear aperture D72 of the second side surface of the seventh lens element and the image height H corresponding to the maximum field of view of the optical lens satisfy the following conditions: 0.8 ≤ D72 / H ≤ 1.2. Preferably, 0.85 ≤ D72 / H ≤ 1.15. Furthermore, 0.939 ≤ D72 / H ≤ 1.07. By controlling this conditional expression, the ratio of the surface aperture of the second side surface of the seventh lens element to the image plane height is rationally controlled, thereby achieving a smaller chief ray angle (CRA).

[0126] In an exemplary embodiment, the effective focal length F5 of the fifth lens element and the total effective focal length F of the optical lens satisfy the following equation: 1.3 ≤ F5 / F ≤ 3. Preferably, 1.5 ≤ F5 / F ≤ 2.8. Furthermore, 1.619 ≤ F5 / F ≤ 2.629. By controlling this conditional equation and utilizing the convex-concave structure of the fifth lens element, the positive focal power combined with the focal length of the small lens element provides strong light converging capabilities, facilitating spherical aberration correction while paving the way for the sixth lens element to diverge light.

[0127] In an exemplary embodiment, the effective focal length F6 of the sixth lens element and the total effective focal length F of the optical lens satisfy the following equation: -2.2 ≤ F6 / F ≤ -0.9. Preferably, -2.0 ≤ F6 / F ≤ -1.1. Furthermore, -1.824 ≤ F6 / F ≤ -1.306. By controlling this conditional equation and leveraging the negative power and shorter focal length of the sixth lens element, the divergence of peripheral light is facilitated, allowing light from a large field of view to better converge on the image plane, thereby improving peripheral illumination.

[0128] In an exemplary embodiment, the effective focal length F5 of the fifth lens and the effective focal length F6 of the sixth lens satisfy the following equation: -2.5 ≤ F5 / F6 ≤ -0.5. Preferably, -2.2 ≤ F5 / F6 ≤ -0.8. Furthermore, -2.013 ≤ F5 / F6 ≤ -1.075. By controlling this conditional equation, the focal length ratio of the fifth and sixth lenses in the cemented component is kept close, ensuring high performance while mitigating the effects of high temperatures on the cemented component, ensuring optimal high-temperature performance.

[0129] In an exemplary embodiment, the sum of the center thickness T5 of the fifth lens element and the center thickness T6 of the sixth lens element along the optical axis, together with the total optical length of the optical lens, satisfies the following equation: 0.12 ≤ (T5 + T6) / TTL ≤ 0.16. Preferably, 0.13 ≤ (T5 + T6) / TTL ≤ 0.153. By controlling this conditional equation and appropriately setting the center thickness of the fifth and sixth lenses, the optical lens effectively enhances light control capabilities, directing more light into the rear system and improving relative illumination.

[0130] In an exemplary embodiment, the effective focal length F3 of the third lens and the effective focal length F4 of the fourth lens satisfy the following relationship: -3.5 ≤ F3 / F4 ≤ -2. Preferably, -3.124 ≤ F3 / F4 ≤ -2.584. By controlling this conditional expression, the effective focal lengths of the third and fourth lenses are regulated within a certain range. The third lens first disperses the light rays to a certain degree, ensuring a smooth and stable transition to the fourth lens. The fourth lens then further smoothly converges the rays, resulting in a low sensitivity within the third and fourth lenses. This reduces the sensitivity of the entire lens, while also facilitating subsequent aperture reduction and achieving back-end miniaturization.

[0131] In an exemplary embodiment, the sag height SAG21 of the first side surface of the second lens and the maximum clear aperture D21 of the first side surface of the second lens satisfy the following relationship: 0.005 ≤ SAG21 / D21 ≤ 0.17. Preferably, 0.01 ≤ SAG21 / D21 ≤ 0.1. Furthermore, 0.022 ≤ SAG21 / D21 ≤ 0.08. By controlling this conditional expression, the center sag height of the second lens is kept small, which reduces the center-to-edge thickness ratio, facilitating molding processing. It also promotes a smooth transition of light across this surface, reducing system sensitivity.

[0132] In an exemplary embodiment, the sag height SAG (at the inflection point) at the inflection point on the first side surface of the third lens and the sag height SAG31 of the first side surface of the third lens satisfy the following conditions: -0.1≤SAG0 / SAG31≤2. Preferably, -0.07≤SAG0 / SAG31≤-0.005. Further, -0.06≤SAG0 / SAG31≤1.086. By controlling this conditional expression, an inflection is provided on the first side surface of the third lens, and the height loss at the inflection is maintained in the opposite direction to the height loss at the full aperture of the third lens, with a significant difference. This helps to maintain a convex center of the first side surface of the third lens while presenting a concave trend overall, which can facilitate better correction of spherical aberration and aberration, thereby improving resolution.

[0133] In an exemplary embodiment, the absolute sag height |SAG31| of the first side surface of the third lens element and the absolute sag height |SAG0| at the inflection point on the first side surface of the third lens element satisfy the following equation: |SAG31| ≥ |SAG0|. By controlling this conditional expression, the height loss at the inflection point is kept smaller than the height loss at the full aperture, resulting in a more pronounced overall concavity of the first side surface of the third lens element. This improves the system's ability to correct aberrations caused by marginal light and enhances resolution.

[0134] In an exemplary embodiment, the effective focal length F3 of the third lens and the total effective focal length F of the optical lens satisfy: -10≤F3 / F≤-6.5. Preferably, -9.005≤F3 / F≤-7.513. By controlling this conditional expression, the focal length of the third lens is controlled to be larger, which is beneficial to reducing the sensitivity of the third lens itself. It can be understood that if the ratio F3 / F is too large, such as when F3 / F>-6.5, although the sensitivity is reduced, it is not conducive to performance improvement; if the ratio F3 / F is too small, such as when F3 / F<-10, the light divergence is too large, which is not conducive to the fourth lens converging the light, and the light deflection is obvious, which is not conducive to sensitivity. In addition, the conditional expression F3 / F is combined with the conditional expression F4 / F so that the negative optical power of the third lens and the positive optical power of the fourth lens are matched, which can adjust the convergence and divergence of light, reduce the coma and other image heights, and improve performance.

[0135] The optical lens according to the above-mentioned embodiment of the present application can adopt multiple lenses, such as the seven lenses mentioned above. By rationally allocating the optical parameters of each lens, the optical lens is achieved with small aperture, miniaturization, high resolution, low sensitivity, large angular resolution, large field of view, back focal length, small distortion, small main light angle, high illumination and processability, and can be well matched with, for example, automotive chips without producing vignetting. The optical lens has excellent temperature performance, with little change in imaging effect at high and low temperatures and stable image quality. Therefore, the optical lens according to the above-mentioned embodiment of the present application can better meet the requirements of, for example, automotive applications.

[0136] Those skilled in the art should understand that the total optical length TTL of the optical lens used above refers to the on-axis distance from the first side surface of the first lens to the imaging plane or the image source plane; the back focal length BFL of the optical lens refers to the on-axis distance from the second side surface of the seventh lens to the imaging plane or the image source plane; and the maximum field of view FOV of the optical lens is associated with the image height H, which refers to the field of view corresponding to the image height H.

[0137] Furthermore, this application focuses on protecting the lens architecture. The lens surface shape is not limited to spherical or aspherical. If resolution quality is the primary concern, all lenses can be aspherical. The lens material is not limited to plastic or glass. If temperature performance is the primary concern, all lenses can be glass.

[0138] However, those skilled in the art will appreciate that the number of lenses comprising the optical lens may be varied to achieve the various results and advantages described herein without departing from the claimed technical solutions. For example, while the embodiments describe an optical lens comprising seven lenses as an example, the optical lens is not limited to seven lenses. If desired, the optical lens may also include other numbers of lenses.

[0139] Specific embodiments of the optical lens applicable to the above-mentioned embodiments will be further described below with reference to the accompanying drawings.

[0140] Example 1

[0141] The following reference Figure 1 The optical lens according to Example 1 of the present application is described.

[0142] like Figure 1 As shown, the optical lens includes, from the first side to the second side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. A stop STO may be disposed between the fourth lens L4 and the fifth lens L5. The fifth lens L5 and the sixth lens L6 are cemented together to form a cemented lens. The first side surface S5 and the second side surface S6 of the third lens L3 have at least one inflection point; the inflection point on the first side surface S5 of the third lens L3 is located at one-third of the maximum clear aperture D21.

[0143] The first lens L1 has negative refractive power, a first side surface S1 of the first lens L1 is convex, and a second side surface S2 of the first lens L1 is concave.

[0144] The second lens L2 has negative refractive power, a first side surface S3 thereof is convex, and a second side surface S4 thereof is concave.

[0145] The third lens L3 has negative refractive power, a first side surface S5 of the third lens L3 is convex, and a second side surface S6 of the third lens L3 is concave.

[0146] The fourth lens L4 has positive refractive power, and its first side surface S7 and second side surface S8 are convex.

[0147] The fifth lens L5 has positive refractive power, and its first side surface S10 and second side surface are convex.

[0148] The sixth lens L6 has negative refractive power, and its first side surface S11 and second side surface S12 are concave.

[0149] The seventh lens L7 has positive refractive power, and its first side surface S13 and second side surface S14 are convex.

[0150] The second side of the optical lens is provided with an image plane IMA. A filter IR and a protective glass CG are disposed between the seventh lens element L7 and the image plane IMA. The filter IR has a first side surface S15 and a second side surface S16, and the protective glass CG has a first side surface S17 and a second side surface S18. When the IMA serves as the imaging plane, light from an object sequentially passes through each surface and is ultimately imaged on the IMA. When the IMA serves as the image source plane, light from the IMA sequentially passes through each surface and is ultimately projected onto the object.

[0151] Table 1 shows the basic parameters of the optical lens of Example 1.

[0152] Table 1

[0153]

[0154] In Example 1, the first side surface S3 and the second side surface S4 of the second lens L2, the first side surface S5 and the second side surface S6 of the third lens L3, and the first side surface S10 of the fifth lens L5 through the second side surface S14 of the seventh lens L7 are all aspherical surfaces. The surface shape of each aspherical surface can be defined by, but is not limited to, the following aspherical surface formula:

[0155] (1);

[0156] Where x is the distance vector from the vertex of the aspheric surface at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the correction coefficient for the i-th order of the aspheric surface. Table 2 shows the conic coefficient k and the higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 that can be used for the aspheric surfaces S3, S4, S5, S6, S10, S11, S12, S13, and S14 in Example 1.

[0157] Table 2

[0158]

[0159] from Figure 2 From the above, we can see that the MTF peak value of the central field of view of the optical lens of Example 1 exceeds 0.8 at a spatial frequency of 83 lp / mm (83 line pairs / mm). Therefore, the optical lens of Example 1 has good imaging quality.

[0160] Example 2

[0161] The following reference Figure 3 The optical lens according to embodiment 2 of the present application is described. Figure 3 As shown, the main difference between this embodiment and embodiment 1 is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0162] Table 3 shows the basic parameters of the optical lens of Example 2.

[0163] Table 3

[0164]

[0165] In Example 2, the first side surface S3 and the second side surface S4 of the second lens L2, the first side surface S5 and the second side surface S6 of the third lens L3, and the first side surface S10 of the fifth lens L5 to the second side surface S14 of the seventh lens L7 are all aspherical surfaces.

[0166] Table 4 gives the cone coefficient k and the higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 of the aspheric surfaces S3, S4, S5, S6, S10, S11, S12, S13 and S14 that can be used in Example 2.

[0167] Table 4

[0168]

[0169] from Figure 4 From the above, we can see that the MTF peak value of the central field of view of the optical lens of Example 2 exceeds 0.8 at a spatial frequency of 83 lp / mm (83 line pairs / mm). Therefore, the optical lens of Example 2 has good imaging quality.

[0170] Example 3

[0171] The following reference Figure 5 The optical lens according to embodiment 3 of the present application is described. Figure 5 As shown, the main differences between this embodiment and Example 1 are: the optical parameters such as the curvature radius of each lens surface and lens thickness are different; the first side surface S3 of the second lens L2 is concave; the first side surface S3 of the second lens L2 has at least one inflection point; and the inflection point on the first side surface S5 of the third lens L3 is located at two-sevenths of the maximum clear aperture D21. Table 5 shows the basic parameters of the optical lens of Example 3.

[0172] Table 5

[0173]

[0174] In Example 3, the first side surface S3 and the second side surface S4 of the second lens L2, the first side surface S5 and the second side surface S6 of the third lens L3, and the first side surface S10 of the fifth lens L5 to the second side surface S14 of the seventh lens L7 are all aspherical surfaces.

[0175] Table 6 gives the cone coefficient k and the higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 of the aspheric surfaces S3, S4, S5, S6, S10, S11, S12, S13 and S14 that can be used in Example 3.

[0176] Table 6

[0177]

[0178] from Figure 6From the above, we can see that the MTF peak value of the central field of view of the optical lens of Example 3 exceeds 0.85 at a spatial frequency of 83 lp / mm (83 line pairs / mm). Therefore, the optical lens of Example 3 has good imaging quality.

[0179] Example 4

[0180] The following reference Figure 7 The optical lens according to embodiment 4 of the present application is described. Figure 7 As shown, the main differences between this embodiment and Example 1 are: the optical parameters such as the curvature radius of each lens surface and the lens thickness are different; the first side surface S3 of the second lens L2 is concave; and the first side surface S3 of the second lens L2 has at least one inflection point.

[0181] Table 7 shows the basic parameters of the optical lens of Example 4.

[0182] Table 7

[0183]

[0184] In Example 4, the first side surface S3 and the second side surface S4 of the second lens L2, the first side surface S5 and the second side surface S6 of the third lens L3, and the first side surface S10 of the fifth lens L5 to the second side surface S14 of the seventh lens L7 are all aspherical surfaces.

[0185] Table 8 gives the cone coefficient k and the higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 of the aspheric surfaces S3, S4, S5, S6, S10, S11, S12, S13 and S14 that can be used in Example 4.

[0186] Table 8

[0187]

[0188] from Figure 8 From the above, we can see that the MTF peak value of the central field of view of the optical lens of Example 4 exceeds 0.85 at a spatial frequency of 83 lp / mm (83 line pairs / mm). Therefore, the optical lens of Example 4 has good imaging quality.

[0189] Example 5

[0190] The following reference Figure 9 The optical lens according to embodiment 5 of the present application is described. Figure 9As shown, the main differences between this embodiment and Example 1 are: the optical parameters such as the curvature radius of each lens surface and lens thickness are different; the second side surface S7 of the third lens L3 does not have an inflection point; the second side surface S8 of the fourth lens L4 is concave; and the inflection point on the first side surface S5 of the third lens L3 is located at eight-ninths of the maximum clear aperture D21.

[0191] Table 9 shows the basic parameters of the optical lens of Example 5.

[0192] Table 9

[0193]

[0194] In Example 5, the first side surface S3 and the second side surface S4 of the second lens L2, the first side surface S5 and the second side surface S6 of the third lens L3, and the first side surface S10 of the fifth lens L5 through the second side surface S14 of the seventh lens L7 are all aspherical surfaces. Table 10 shows the conic coefficient k and the higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 of the aspherical surfaces S3, S4, S5, S6, S10, S11, S12, S13, and S14 that can be used in Example 5.

[0195] Table 10

[0196]

[0197] from Figure 10 From the above, we can see that the MTF peak value of the central field of view of the optical lens of Example 5 exceeds 0.8 at a spatial frequency of 83 lp / mm (83 line pairs / mm). Therefore, the optical lens of Example 5 has good imaging quality.

[0198] Example 6

[0199] The following reference Figure 11 The optical lens according to embodiment 6 of the present application is described. Figure 11 As shown, the main differences between this embodiment and Example 1 are: the optical parameters such as the curvature radius of each lens surface and lens thickness are different; the second side surface S7 of the third lens L3 does not have an inflection point; the second side surface S8 of the fourth lens L4 is concave; and the inflection point on the first side surface S5 of the third lens L3 is located at eight-ninths of the maximum clear aperture D21.

[0200] Table 11 shows the basic parameters of the optical lens of Example 6.

[0201] Table 11

[0202]

[0203] In Example 6, the first side surface S3 and the second side surface S4 of the second lens L2, the first side surface S5 and the second side surface S6 of the third lens L3, and the first side surface S10 of the fifth lens L5 through the second side surface S14 of the seventh lens L7 are all aspherical surfaces. Table 12 lists the conic coefficient k and the higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 of the aspherical surfaces S3, S4, S5, S6, S10, S11, S12, S13, and S14 that can be used in Example 6.

[0204] Table 12

[0205]

[0206] from Figure 12 From the above, we can see that the MTF peak value of the central field of view of the optical lens of Example 6 exceeds 0.78 at a spatial frequency of 83 lp / mm (83 line pairs / mm). Therefore, the optical lens of Example 6 has good imaging quality.

[0207] Example 7

[0208] The following reference Figure 13 The optical lens according to embodiment 7 of the present application is described. Figure 13 As shown, the main differences between this embodiment and Example 1 are: the optical parameters such as the curvature radius of each lens surface and lens thickness are different; the second side surface S12 of the sixth lens L6 is convex; the second side surface S14 of the seventh lens L7 has at least one inflection point; and the inflection point on the first side surface S5 of the third lens L3 is located at two-sevenths of the maximum clear aperture D21.

[0209] Table 13 shows the basic parameters of the optical lens of Example 7.

[0210] Table 13

[0211]

[0212] In Example 7, the first side surface S3 and the second side surface S4 of the second lens L2, the first side surface S5 and the second side surface S6 of the third lens L3, and the first side surface S10 of the fifth lens L5 through the second side surface S14 of the seventh lens L7 are all aspherical surfaces. Table 14 shows the conic coefficient k and the higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 of the aspherical surfaces S3, S4, S5, S6, S10, S11, S12, S13, and S14 that can be used in Example 7.

[0213] Table 14

[0214]

[0215] from Figure 14 From the above, we can see that the MTF peak value of the central field of view of the optical lens of Example 7 exceeds 0.78 at a spatial frequency of 83 lp / mm (83 line pairs / mm). Therefore, the optical lens of Example 7 has good imaging quality.

[0216] Example 8

[0217] The following reference Figure 15 The optical lens according to Example 8 of the present application is described. Figure 15 As shown, the main differences between this embodiment and Embodiment 1 are: the optical parameters such as the curvature radius of each lens surface and the lens thickness are different; and the second side surface S12 of the sixth lens L6 is a convex surface.

[0218] Table 15 shows the basic parameters of the optical lens of Example 8.

[0219] Table 15

[0220]

[0221] In Example 8, the first side surface S3 and the second side surface S4 of the second lens L2, the first side surface S5 and the second side surface S6 of the third lens L3, and the first side surface S10 of the fifth lens L5 through the second side surface S14 of the seventh lens L7 are all aspherical surfaces. Table 16 shows the conic coefficient k and the higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 of the aspherical surfaces S3, S4, S5, S6, S10, S11, S12, S13, and S14 that can be used in Example 8.

[0222] Table 16

[0223]

[0224] from Figure 16 From the above, we can see that the MTF peak value of the central field of view of the optical lens of Example 8 exceeds 0.8 at a spatial frequency of 83 lp / mm (83 line pairs / mm). Therefore, the optical lens of Example 8 has good imaging quality.

[0225] Example 9

[0226] The following reference Figure 17 The optical lens according to Example 9 of the present application is described. Figure 17As shown, the main differences between this embodiment and Example 1 are: the optical parameters such as the curvature radius of each lens surface and lens thickness are different; the second side surface S14 of the seventh lens element L7 is concave; the second side surface S4 of the third lens element L3 does not have an inflection point; the second side surface S11 of the fifth lens element L5, the first side surface S11 of the sixth lens element L6, and the second side surface S14 of the seventh lens element L7 all have at least one inflection point; and the inflection point on the first side surface S5 of the third lens element L3 is located at two-fifths of the maximum clear aperture D21.

[0227] Table 17 shows the basic parameters of the optical lens of Example 9.

[0228] Table 17

[0229]

[0230] In Example 9, the first side surface S3 and the second side surface S4 of the second lens L2, the first side surface S5 and the second side surface S6 of the third lens L3, and the first side surface S10 of the fifth lens L5 through the second side surface S14 of the seventh lens L7 are all aspherical surfaces. Table 18 lists the conic coefficient k and the higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 of the aspherical surfaces S3, S4, S5, S6, S10, S11, S12, S13, and S14 that can be used in Example 9.

[0231] Table 18

[0232]

[0233] from Figure 18 From the above, we can see that the MTF peak of the central field of view of the optical lens of Example 9 exceeds 0.85 at a spatial frequency of 83 lp / mm (83 line pairs / mm). Therefore, the optical lens of Example 9 has good imaging quality.

[0234] Example 10

[0235] The following reference Figure 19 The optical lens according to embodiment 10 of the present application is described. Figure 19 As shown, the main differences between this embodiment and Example 1 are: the optical parameters such as the curvature radius of each lens surface and lens thickness are different; the second side surface S14 of the seventh lens L7 is concave; the second side surface S4 of the third lens L3 has no inflection point; the first side surface S11 of the sixth lens L6 and the second side surface S14 of the seventh lens L7 have at least one inflection point; and the inflection point on the first side surface S5 of the third lens L3 is located at two-fifths of the maximum clear aperture D21.

[0236] Table 19 shows the basic parameters of the optical lens of Example 10.

[0237] Table 19

[0238]

[0239] In Example 10, the first side surface S3 and the second side surface S4 of the second lens L2, the first side surface S5 and the second side surface S6 of the third lens L3, and the first side surface S10 of the fifth lens L5 through the second side surface S14 of the seventh lens L7 are all aspherical surfaces. Table 20 lists the conic coefficient k and the higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 of the aspherical surfaces S3, S4, S5, S6, S10, S11, S12, S13, and S14 that can be used in Example 10.

[0240] Table 20

[0241]

[0242] from Figure 20 From the above, we can see that the MTF peak value of the central field of view of the optical lens of Example 10 exceeds 0.85 at a spatial frequency of 83 lp / mm (83 line pairs / mm). Therefore, the optical lens of Example 10 has good imaging quality.

[0243] Tables 21-1 and 21-2 list the basic parameters of the optical lenses used in Examples 1-10, such as F, TTL, FOV, H, BFL, F1, F2, F3, F4, F5, F6, F7, R11, R12, R22, R31, R32, R41, R42, R51, R61, R71, T3, d34, T4, T5, T6, D11, D21, D72, SAG21, SAG31, SAG0, F56, F12, F34, and T3-ing. The unit for FOV in the table is degrees, and the units for the other parameters are mm.

[0244] Table 21-1

[0245]

[0246] Table 21-2

[0247]

[0248] In summary, the conditional expressions of each embodiment in Examples 1-10 satisfy the relationships shown in Table 22-1 and Table 22-2.

[0249] Table 22-1

[0250]

[0251] Table 22-2

[0252]

[0253] The present application also provides an electronic device comprising the optical lens of the exemplary embodiment described above and an imaging element for converting an optical image formed by the optical lens into an electrical signal. The imaging element is disposed on a second side of the optical lens, for example, on an imaging surface, and may be implemented as a charge-coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). Light from the first side passes through the optical lens to form an image on the second side.

[0254] The present application also provides an electronic device comprising the optical lens of the exemplary embodiment described above and a light source, wherein the light source is located on the second side of the optical lens. Light emitted by the light source passes through the optical lens and is projected onto the first side of the optical lens, thereby forming an image or illuminating an area on the first side.

[0255] The present application also provides an electronic device, which includes a first device and a second device. The first device can be implemented as a laser radar transmitting device, and the second device can be implemented as a laser radar receiving device. The first device may include the optical lens and light source in the above exemplary embodiment. The light source is located on the second side of the optical lens. The light emitted by the light source passes through the optical lens and is projected onto the first side of the optical lens, forming an image or illuminating an area on the first side. The second device may include the optical lens in the above exemplary embodiment and an imaging element for converting the optical image formed by the optical lens into an electrical signal. The imaging element is disposed on the second side of the optical lens (for example, on the imaging surface). The imaging element can be implemented as a photosensitive coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The light from the first side is imaged on the second side after passing through the optical lens.

[0256] The above description is merely a preferred embodiment of this application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of this application is not limited to technical solutions formed by a specific combination of the aforementioned technical features. It also encompasses other technical solutions formed by any combination of the aforementioned technical features or their equivalents, without departing from the intended scope. For example, a technical solution formed by replacing the aforementioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical lens, characterized in that: The device comprises, in order from the first side to the second side along the optical axis: a first lens having negative optical power, wherein a first side surface and a second side surface of the first lens are convex and concave, respectively; a second lens having negative optical power, wherein the second side surface of the second lens is concave; a third lens having negative optical power, wherein the first side surface and the second side surface of the third lens are convex and concave, respectively; a fourth lens element having positive optical power, wherein the first side surface of the fourth lens element is a convex surface; a fifth lens element having positive optical power, wherein the first side surface and the second side surface of the fifth lens element are both convex surfaces; a sixth lens having negative optical power, wherein the first side surface of the sixth lens is concave; a seventh lens element having positive optical power, wherein the first side surface of the seventh lens element is convex; Wherein, the number of lenses having optical power in the optical lens is seven; The optical lens satisfies the following requirements: 5≤R31 / F≤20; 3mm≤T4×F / T3≤11mm and 2.6≤F4 / F≤3.4; Among them, R31 is the curvature radius of the first side surface of the third lens; F is the total effective focal length of the optical lens; T4 is the center thickness of the fourth lens on the optical axis; T3 is the center thickness of the third lens on the optical axis; F4 is the effective focal length of the fourth lens.

2. The optical lens according to claim 1, wherein: The first side surface of the second lens is a convex surface or a concave surface.

3. The optical lens according to claim 1, wherein: The second side surface of the fourth lens is a convex surface or a concave surface.

4. The optical lens according to claim 1, wherein: The second side surface of the sixth lens is a convex surface or a concave surface.

5. The optical lens according to claim 1, wherein: The second side surface of the seventh lens is a convex surface or a concave surface.

6. The optical lens according to claim 1, wherein: The first side surface of the third lens has at least one inflection point; the central area of ​​the first side surface of the third lens is a convex surface, and the edge area of ​​the first side surface of the third lens is a concave surface.

7. The optical lens according to claim 1, wherein: The fifth lens is cemented with the sixth lens to form a cemented lens.

8. The optical lens according to any one of claims 1 to 7, wherein: The effective focal length F7 of the seventh lens and the total effective focal length F of the optical lens satisfy the following: 1≤F7 / F≤3.

6.

9. The optical lens according to any one of claims 1 to 7, wherein: A curvature radius R41 of the first side surface of the fourth lens and a curvature radius R42 of the second side surface of the fourth lens satisfy: 0.3≤|R41 / R42|≤1.

2.

10. The optical lens according to any one of claims 1 to 7, wherein: A curvature radius R31 of the first side surface of the third lens and a curvature radius R32 of the second side surface of the third lens satisfy: 2≤R31 / R32≤5.

8.

11. The optical lens according to any one of claims 1 to 7, wherein: An axial distance d34 from the second side surface of the third lens to the first side surface of the fourth lens and a total optical length TTL of the optical lens satisfy the following: 0≤d34 / TTL≤0.

012.

12. The optical lens according to any one of claims 1 to 7, wherein: The optical lens satisfies the following requirements: 11≤TTL / F≤15 and 0.08≤BFL / TTL≤0.3; Wherein, TTL is the total optical length of the optical lens; F is the total effective focal length of the optical lens; BFL is the optical back focus of the optical lens.

13. The optical lens according to any one of claims 1 to 7, wherein: The maximum clear aperture D11 of the first side surface of the first lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy the following requirements: 0.011≤D11 / H / FOV×1°≤0.

017.

14. The optical lens according to any one of claims 1 to 7, wherein: The optical lens satisfies at least one of the following conditional expressions: -7≤F1 / F≤-3.5; -3≤F2 / F≤-2; 1.6≤F1 / F2≤2.5 and -1.6≤F12 / F≤-1.2; Among them, F1 is the effective focal length of the first lens; F is the total effective focal length of the optical lens; F2 is the effective focal length of the second lens; F12 is the combined focal length of the first lens and the second lens.

15. The optical lens according to any one of claims 1 to 7, wherein: The effective focal length F4 of the fourth lens and the effective focal length F7 of the seventh lens satisfy the following: 0.7≤F4 / F7≤2.

3.

16. The optical lens according to any one of claims 1 to 7, wherein: The optical lens satisfies at least one of the following conditional expressions: 2.5≤R11 / R12≤4; 7.5≤R11 / F≤11 and 0.19≤R12 / TTL≤0.24; Among them, R11 is the curvature radius of the first side surface of the first lens; R12 is the curvature radius of the second side surface of the first lens; F is the total effective focal length of the optical lens; TTL is the total optical length of the optical lens.

17. The optical lens according to any one of claims 1 to 7, wherein: The optical lens satisfies at least one of the following conditional expressions: 0.9≤R22 / F≤1.6; 0.85≤R71 / F≤2.3; 2.5≤R32 / F≤4; 0.1≤R41 / TTL≤0.7; 0.12≤R51 / TTL≤0.3; -0.25≤R61 / TTL≤-0.04 and -5.0≤R51 / R61≤-0.5; Among them, R22 is the curvature radius of the second side surface of the second lens; F is the total effective focal length of the optical lens; R71 is the curvature radius of the first side surface of the seventh lens; R32 is the curvature radius of the second side surface of the third lens; R41 is the curvature radius of the first side surface of the fourth lens; TTL is the total optical length of the optical lens; R51 is the curvature radius of the first side surface of the fifth lens; R61 is the curvature radius of the first side surface of the sixth lens.

18. The optical lens according to any one of claims 1 to 7, wherein: The combined focal length F34 of the third lens and the fourth lens and the combined focal length F56 of the fifth lens and the sixth lens satisfy the following: -1.8≤F34 / F56≤0.

8.

19. The optical lens according to any one of claims 1 to 7, wherein: An axial distance T3-ing from the first side surface of the third lens to the image plane and a total optical length TTL of the optical lens satisfy the following conditions: 0.4≤T3-ing / TTL≤0.

8.

20. The optical lens according to any one of claims 1 to 7, wherein: The maximum clear aperture D72 of the second side surface of the seventh lens and the image height H corresponding to the maximum field angle of the optical lens satisfy the following: 0.8≤D72 / H≤1.

2.

21. The optical lens according to any one of claims 1 to 7, wherein: The optical lens satisfies at least one of the following conditional expressions: 1.3≤F5 / F≤3; -2.2≤F6 / F≤-0.9 and -2.5≤F5 / F6≤-0.5; Among them, F5 is the effective focal length of the fifth lens; F is the total effective focal length of the optical lens; F6 is the effective focal length of the sixth lens.

22. The optical lens according to any one of claims 1 to 7, wherein: The sum of the center thickness T5 of the fifth lens on the optical axis and the center thickness T6 of the sixth lens on the optical axis and the total optical length of the optical lens satisfy the following relationship: 0.12≤(T5+T6) / TTL≤0.

16.

23. The optical lens according to any one of claims 1 to 7, wherein: The effective focal length F3 of the third lens and the effective focal length F4 of the fourth lens satisfy the following: -3.5≤F3 / F4≤-2.

24. The optical lens according to any one of claims 1 to 7, wherein: The sag height SAG21 of the first side surface of the second lens and the maximum clear aperture D21 of the first side surface of the second lens satisfy the following: 0.005≤SAG21 / D21≤0.

17.

25. The optical lens according to any one of claims 1 to 7, wherein: The optical lens satisfies at least one of the following conditional expressions: -0.1≤SAG0 / SAG31≤2 and |SAG31|≥|SAG0|; Among them, SAG0 is the sag height at the inflection point on the first side surface of the third lens; SAG31 is the sag height of the first side surface of the third lens.

26. The optical lens according to any one of claims 1 to 7, wherein: The effective focal length F3 of the third lens and the total effective focal length F of the optical lens satisfy the following: -10≤F3 / F≤-6.

5.

27. The optical lens according to any one of claims 1 to 7, wherein: The optical lens satisfies at least one of the following conditional expressions: 2.7≤F4 / F≤3.3; 0.35≤|R41 / R42|≤1.1; 7≤R31 / F≤18; -6.5≤F1 / F≤-4; -2.2≤F5 / F6≤-0.8; 0.1≤BFL / TTL≤0.2; -4.5≤R51 / R61≤-0.65; 0.85≤D72 / H≤1.15; 1.5≤F5 / F≤2.8; -2≤F6 / F≤-1.1; and 1.7≤F1 / F2≤2.4 ;3≤R11 / R12≤3.4;0.5≤T3-ing / TTL≤0.7;2.6≤R32 / F≤3.85;0.12≤R41 / TTL≤0.5;0.14≤R51 / TTL≤0.3;-0.2≤R61 / TTL≤-0.05;-1.5≤F34 / F56≤0.6;0.01≤SAG21 / D21≤0.1;-0.07≤SAG0 / SAG31≤-0.005 and 3.5mm≤T4×F / T3≤10mm; Wherein, F4 is the effective focal length of the fourth lens; F is the total effective focal length of the optical lens; R41 is the curvature radius of the first side surface of the fourth lens; R42 is the curvature radius of the second side surface of the fourth lens; F7 is the effective focal length of the seventh lens; R31 is the curvature radius of the first side surface of the third lens; F1 is the effective focal length of the first lens; F5 is the effective focal length of the fifth lens; F6 is the effective focal length of the sixth lens; BFL is the optical back focus of the optical lens; TTL is the total optical length of the optical lens; R51 is the curvature radius of the first side surface of the fifth lens; R61 is the curvature radius of the first side surface of the sixth lens; D72 is the maximum clear aperture of the second side surface of the seventh lens; H is the image height corresponding to the maximum field of view of the optical lens; F2 is the The effective focal length of the second lens; R11 is the curvature radius of the first side surface of the first lens; R12 is the curvature radius of the second side surface of the first lens; T3-ing is the on-axis distance from the first side surface of the third lens to the image plane; R32 is the curvature radius of the second side surface of the third lens; F34 is the combined focal length of the third lens and the fourth lens; F56 is the combined focal length of the fifth lens and the sixth lens; SAG21 is the sag of the first side surface of the second lens; D21 is the maximum clear aperture of the first side surface of the second lens; SAG0 is the sag at the inflection point on the first side surface of the third lens; SAG31 is the sag of the first side surface of the third lens; T4 is the center thickness of the fourth lens on the optical axis; T3 is the center thickness of the third lens on the optical axis.

28. The optical lens according to any one of claims 1 to 7, wherein: The optical lens satisfies at least one of the following conditional expressions: 2.775≤F4 / F≤3.205; 0.45≤|R41 / R42|≤0.96; 1.621≤F7 / F≤2.991; -9.005≤F3 / F≤-7.513; 2.96≤R31 / R32≤4.752; 8.505 ≤ R31 / F ≤ 15.022; 0.005 ≤ d34 / TTL ≤ 0.01; 12.551 ≤ TTL / F ≤ 14.02; 0.013 ≤ D11 / H / FOV×1° ≤ 0.015; -6.158 ≤ F1 / F ≤ -4.922; -2.954 ≤ F2 / F ≤ -2.495; -2.013 ≤ F5 / F6 ≤ -1.075; 0.126 ≤ BFL / TTL ≤ 0.152; 8.67 ≤ R11 / F ≤ 10.19; 0.13 ≤ (T5 + T6) / TTL ≤ 0.153; -3.297 ≤ R51 / R61 ≤ -1.001; 0.939 ≤ D72 / H ≤ 1.07; 1.619 ≤ F_{5} / F ≤ 2.629; -1.824 ≤ F_{6} / F ≤ -1.306; 1.769 ≤ F_{1} / F_{2} ≤ 2.295; 0.97 ≤ F_{4} / F_{7} ≤ 1.976; 3.113 ≤ R_{11} / R_{12} ≤ 3.389; 1.099 ≤ R_{22} / F ≤ 1.457; 1.042 ≤ R_{71} / F ≤ 2.018; 0.589 ≤ T3 - ing / TTL ≤ 0.659; 0.208 ≤ R_{12} / TTL ≤ 0.232; 2.873 ≤ R32 / F ≤ 3.63; 0.163 ≤ R41 / TTL ≤ 0.417; 0.166 ≤ R51 / TTL ≤ 0.253; -0.175 ≤ R61 / TTL ≤ -0.075; -1.573 ≤ F12 / F ≤ -1.372; -1.036 ≤ F34 / F56 ≤ 0.268; -3.124 ≤ F3 / F4 ≤ -2.584; 0.022 ≤ SAG21 / D21 ≤ 0.08; -0.06 ≤ SAG0 / SAG31 ≤ 1.086 and 4.085mm ≤ T4×F / T3 ≤ 9.606mm; Wherein, F4 is the effective focal length of the fourth lens; F is the total effective focal length of the optical lens; R41 is the radius of curvature of the first side surface of the fourth lens; R42 is the radius of curvature of the second side surface of the fourth lens; F7 is the effective focal length of the seventh lens; F3 is the effective focal length of the third lens; R31 is the curvature radius of the first side of the third lens; R32 is the curvature radius of the second side of the third lens; d34 is the on-axis distance from the second side of the third lens to the first side of the fourth lens; TTL is the total optical length of the optical lens; D11 is the maximum clear aperture of the first side of the first lens; H is the image height corresponding to the maximum field of view of the optical lens; FOV is the maximum field of view of the optical lens; F1 is the effective focal length of the first lens; F2 is the effective focal length of the second lens; F5 is the effective focal length of the fifth lens; F6 is the effective focal length of the sixth lens; BFL is the optical back focus of the optical lens; R11 is the curvature radius of the first side of the first lens; T5 is the center thickness of the fifth lens on the optical axis; T6 is the center thickness of the sixth lens on the optical axis; R51 is the first side of the fifth lens Curvature radius; R61 is the curvature radius of the first side surface of the sixth lens; D72 is the maximum light-clearing aperture of the second side surface of the seventh lens; R12 is the curvature radius of the second side surface of the first lens; R71 is the curvature radius of the first side surface of the seventh lens; T3-ing is the on-axis distance from the first side surface of the third lens to the image plane; F12 is the combined focal length of the first lens and the second lens; F34 is the combined focal length of the third lens and the fourth lens; F56 is the combined focal length of the fifth lens and the sixth lens; SAG21 is the sag of the first side surface of the second lens; D21 is the maximum light-clearing aperture of the first side surface of the second lens; SAG0 is the sag at the inflection point on the first side surface of the third lens; SAG31 is the sag of the first side surface of the third lens; T4 is the center thickness of the fourth lens on the optical axis; T3 is the center thickness of the third lens on the optical axis.

29. An electronic device, characterized in that include: The optical lens according to any one of claims 1 to 28; and at least one of an imaging element and a light source; The imaging element is located on the second side of the optical lens and is used to convert the optical image or optical information formed by the optical lens into an electrical signal; The light source is located on the second side of the optical lens, and the light emitted by the light source is projected onto the first side of the optical lens after passing through the optical lens, and forms an image or illuminates an area on the first side of the optical lens.

Images