Optical lenses and electronic equipment

Abstract

The present application discloses an optical lens and an electronic device. The optical lens sequentially includes a first lens with a positive optical power, a second lens with a negative optical power, a third lens with a positive optical power, and a fourth lens with a positive optical power along the optical axis from the first side to the second side. The first side of the first lens is a convex surface, the second side is a convex surface, the second side of the second lens is a concave surface, the first side of the third lens is a convex surface, and the first side of the fourth lens is a convex surface. The optical lens further includes a diaphragm, and the diaphragm is located between the second lens and the third lens or between the third lens and the fourth lens. The distance d 前 from the center of the first side of the first lens to the diaphragm on the optical axis satisfies: 0.3 ≤ d 前 / TTL ≤ 1; the air gap d2 between the first lens and the second lens on the optical axis and the overall optical length TTL of the optical lens satisfy: 0.01 ≤ d2 / TTL ≤ 0.1.

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 advent of the era of intelligent connected cars has accelerated the popularization and application of intelligent headlight technology. Intelligent headlights provide people with better ways of human-vehicle interaction and audio-visual entertainment needs, and people's requirements for projection lens resolution are also constantly increasing. Different from ordinary projection lenses, projection lenses for intelligent headlights have more special requirements in terms of human-vehicle interaction and audio-visual entertainment.

[0003] The projection lenses of smart car lights in the prior art still have the following deficiencies: 1) Although the projection lenses in the prior art can achieve a clarity of ten thousand pixels, the lens aberration problems such as chromatic aberration, astigmatism, and distortion are relatively serious; 2) Although the projection lenses in the prior art can achieve a clarity of ten thousand pixels, the projection luminous flux and illumination are low; 3) The resolution of the projection lenses in the prior art is low, and the realization of pattern details is poor. Summary of the invention

[0004] In a first aspect, the present application provides an optical lens, which includes, in order from the first side to the second side along the optical axis, a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power, and a fourth lens with positive focal power. The first side surface of the first lens is convex, the second side surface is convex, the second side surface of the second lens is concave, the first side surface of the third lens is convex, and the first side surface of the fourth lens is convex. The optical lens also includes an aperture located on the second side of the second lens. The distance d from the center of the first side surface of the first lens to the aperture on the optical axis is 前 The total optical length TTL of the optical lens satisfies: 0.3≤d 前 / TTL≤1; the air interval d2 between the first lens and the second lens on the optical axis and the total optical length TTL of the optical lens satisfy: 0.01≤d2 / TTL≤0.1.

[0005] In one embodiment, the first side surface of the second lens is a convex surface.

[0006] In one embodiment, the first side surface of the second lens is concave.

[0007] In one embodiment, the second side surface of the third lens is a convex surface, a concave surface, or a flat surface.

[0008] In one embodiment, the second side surface of the fourth lens is a convex surface, a concave surface, or a flat surface.

[0009] In one embodiment, the optical lens satisfies: 0.7≤(H / 2) / (F×tan(FOV / 2))≤1.2, wherein F is the total effective focal length of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, and FOV is the maximum field of view of the optical lens.

[0010] In one embodiment, the optical lens satisfies at least one of the following: F / TTL≥0.3, F / H≥1, wherein F is the total effective focal length of the optical lens, TTL is the total optical length of the optical lens, and H is the image height corresponding to the maximum field of view angle of the optical lens.

[0011] In one embodiment, the optical lens satisfies: BFL / TTL≤0.3, wherein BFL is the distance from the center of the second side surface of the fourth lens to the imaging surface of the optical lens on the optical axis, and TTL is the total optical length of the optical lens.

[0012] In one embodiment, the optical lens satisfies: -0.01≤ 前 / ≤1, where 前 is the combined focal power of all lenses located on the first side of the aperture, is the total optical power of the optical lens.

[0013] In one embodiment, the optical lens satisfies: |ST-Fobj| / F≥0.7, wherein |ST-Fobj| is the distance from the aperture of the optical lens to the first side focal plane of the optical lens, and F is the total effective focal length of the optical lens.

[0014] In one embodiment, the optical lens satisfies at least one of the following: 0.5≤DST / F≤1.5, 0.3≤DST / D1≤0.9, wherein DST is the full aperture of the aperture, F is the total effective focal length of the optical lens, and D1 is the maximum aperture of the first side of the first lens.

[0015] In one embodiment, the optical lens satisfies: |R8 / F|≥0.5, wherein R8 is the radius of curvature of the second side surface of the fourth lens, and F is the total effective focal length of the optical lens.

[0016] In one embodiment, the optical lens satisfies: -1≤R7 / R8≤1.5, wherein R7 is the radius of curvature of the first side surface of the fourth lens, and R8 is the radius of curvature of the second side surface of the fourth lens.

[0017] In one embodiment, the optical lens satisfies: F1 / F≥1, wherein F1 is the effective focal length of the first lens, and F is the total effective focal length of the optical lens.

[0018] In one embodiment, the optical lens satisfies: -1.7≤F1 / F2≤-1, wherein F1 is the effective focal length of the first lens, and F2 is the effective focal length of the second lens.

[0019] In one embodiment, the optical lens satisfies: 0.5≤d 前 / d 后 ≤3, where d 前 is the distance from the center of the first side surface of the first lens to the aperture on the optical axis, d 后 It is the distance from the aperture to the imaging surface of the optical lens on the optical axis.

[0020] In one embodiment, the optical lens satisfies: 0.03≤d3 / TTL≤0.2, wherein d3 is the center thickness of the second lens on the optical axis, and TTL is the total optical length of the optical lens.

[0021] In one embodiment, the optical lens satisfies: 0.11≤d3 / F≤0.45, wherein d3 is the center thickness of the second lens on the optical axis, and F is the total effective focal length of the optical lens.

[0022] In one embodiment, the optical lens satisfies: -1≤(R2-R3) / (R2+R3)≤7.2, wherein R2 is the radius of curvature of the second side surface of the first lens, and R3 is the radius of curvature of the first side surface of the second lens.

[0023] In one embodiment, the optical lens satisfies: -20mm≤1 / (1 / R3-1 / R4)≤0mm, R3 is the radius of curvature of the first side surface of the second lens, and R4 is the radius of curvature of the second side surface of the second lens.

[0024] In one embodiment, an edge angle arctan(1 / K(S4)) of the second side surface of the second lens at the maximum field angle of the optical lens satisfies: arctan(1 / K(S4))≥30°.

[0025] In one embodiment, the optical lens satisfies: |SAG6 / SAG5|≤1.5, wherein SAG5 is the sag corresponding to the first side surface of the third lens at the maximum field of view angle of the optical lens, and SAG6 is the sag corresponding to the second side surface of the third lens at the maximum field of view angle of the optical lens.

[0026] In one embodiment, the optical lens satisfies: 0≤|R2 / F|≤1.2, wherein R2 is the radius of curvature of the second side surface of the first lens, and F is the total effective focal length of the optical lens.

[0027] In one embodiment, the optical lens satisfies: d4 / TTL≥0.05, wherein d4 is the air distance between the second lens and the third lens on the optical axis, and TTL is the total optical length of the optical lens.

[0028] In one embodiment, the optical lens satisfies at least one of the following: 0.1≤ 34 / ≤2.5, 0.2≤F3 / F4≤2, where: 34 is the combined focal length of the third lens and the fourth lens, is the total focal power of the optical lens, F3 is the effective focal length of the third lens, and F4 is the effective focal length of the fourth lens.

[0029] In one embodiment, the optical lens satisfies at least one of the following conditions: 0.45≤d 前 / TTL≤0.75, 0.025≤d2 / TTL≤0.095, 0.92≤(H / 2) / (F×tan(FOV / 2))≤0.99, 0.42≤F / TTL≤0.52, 1.8≤F / H≤2.5, BFL / TTL≤0.13, -0.007≤ 前 / ≤0.8, 0.8≤|ST-Fobj| / F≤1.9, 0.88≤DST / F≤1.45, 0.44≤DST / D1≤0.78, 0.5≤|R8 / F|≤6, -0.5≤R7 / R8≤1, F1 / F≥1.1, -1.7≤F1 / F2≤-1.3, 0.9≤d 前 / d 后 ≤2.9, 0.05≤d3 / TTL≤0.15, 0.15≤d3 / F≤0.26, -0.7≤(R2-R3) / (R2+R3)≤6, -15mm≤1 / (1 / R3- 1 / R4)≤-7mm, arctan(1 / K(S4))≥35°, |SAG6 / SAG5|≤1, 0.6≤|R2 / F|≤1, d4 / TTL≥0.06, 1.3≤ 34 / ≤2, 0.3≤F3 / F4≤1.5, wherein dfront is the distance from the center of the first side surface of the first lens to the aperture on the optical axis, TTL is the total optical length of the optical lens, d2 is the air interval between the first lens and the second lens on the optical axis, F is the total effective focal length of the optical 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, BFL is the distance from the center of the second side surface of the fourth lens to the imaging surface of the optical lens on the optical axis, Front is the combined focal power of all lenses located on the first side of the aperture, is the total focal power of the optical lens, |ST-Fobj| is the distance from the aperture of the optical lens to the focal plane of the first side of the optical lens, DST is the full aperture of the aperture, D1 is the maximum aperture of the first side of the first lens, R8 is the radius of curvature of the second side of the fourth lens, R7 is the radius of curvature of the first side of the fourth lens, F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, d is the distance from the aperture to the imaging surface of the optical lens on the optical axis, d3 is the center thickness of the second lens on the optical axis, and R2 is The radius of curvature of the second side surface of the first lens, R3 is the radius of curvature of the first side surface of the second lens, R4 is the radius of curvature of the second side surface of the second lens, arctan(1 / K(S4)) is the edge angle of the second side surface of the second lens at the maximum field of view of the optical lens, SAG5 is the sagittal height corresponding to the first side surface of the third lens at the maximum field of view of the optical lens, SAG6 is the sagittal height corresponding to the second side surface of the third lens at the maximum field of view of the optical lens, d4 is the air gap between the second lens and the third lens on the optical axis, 34 is the combined focal power of the third lens and the fourth lens, F3 is the effective focal length of the third lens, and F4 is the effective focal length of the fourth lens.

[0030] In one embodiment, the optical lens satisfies at least one of the following conditions: 0.54≤d 前 / TTL≤0.73, 0.03≤d2 / TTL≤0.09, 0.93≤(H / 2) / (F×tan(FOV / 2))≤0.97, 0.43≤F / TTL≤0.50, 1.92≤F / H≤2.37, 0.05≤BFL / TTL≤0.11, -0.006≤ 前 / ≤0.66, 0.93≤|ST-Fobj| / F≤1.65, 0.92≤DST / F≤1.25, 0.54≤DST / D1≤0.73, 0.84≤| R8 / F|≤4.92, -0.17≤R7 / R8≤0.77, 1.14≤F1 / F≤1.25, -1.70≤F1 / F2≤-1.41, 1.17≤d 前 / d 后 ≤2.69, 0.07≤d3 / TTL≤0.13, 0.18≤d3 / F≤0.26, -0.82≤(R2-R3) / (R2+R3)≤5.80, -12.06mm≤1 / (1 / R3-1 / R4)≤-8.67 mm, 39.69°≤arctan(1 / K(S4))≤60.14°, 0.08≤|SAG6 / SAG5|≤0.74, 0.73≤|R2 / F|≤0.99, 0.08≤d4 / TTL≤0.23, 1.52≤ 34 / ≤1.75,0.47≤F3 / F4≤1.37,where,d 前 is the distance from the center of the first side surface of the first lens to the aperture on the optical axis, TTL is the total optical length of the optical lens, d2 is the air interval between the first lens and the second lens on the optical axis, F is the total effective focal length of the optical 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, BFL is the distance from the center of the second side surface of the fourth lens to the imaging surface of the optical lens on the optical axis, 前 is the combined focal power of all lenses located on the first side of the aperture, is the total focal power of the optical lens, |ST-Fobj| is the distance from the aperture of the optical lens to the focal plane of the first side of the optical lens, DST is the full aperture of the aperture, D1 is the maximum aperture of the first side of the first lens, R8 is the curvature radius of the second side of the fourth lens, R7 is the curvature radius of the first side of the fourth lens, F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, d 后 is the distance from the aperture to the imaging surface of the optical lens on the optical axis, d3 is the center thickness of the second lens on the optical axis, R2 is the curvature radius of the second side surface of the first lens, R3 is the curvature radius of the first side surface of the second lens, R4 is the curvature radius of the second side surface of the second lens, arctan(1 / K(S4)) is the edge opening angle of the second side surface of the second lens at the maximum field angle of the optical lens, SAG5 is the sagittal height corresponding to the first side surface of the third lens at the maximum field angle of the optical lens, SAG6 is the sagittal height corresponding to the second side surface of the third lens at the maximum field angle of the optical lens, d4 is the air gap between the second lens and the third lens on the optical axis, 34 is the combined focal power of the third lens and the fourth lens, F3 is the effective focal length of the third lens, and F4 is the effective focal length of the fourth lens.

[0031] The second aspect of the present application provides an electronic device, which includes the optical lens provided by the present application and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

[0032] The optical lens provided by the present application adopts four lenses, and the shape and optical power of each lens are reasonably set. The first lens, the third lens and the fourth lens have positive optical power, the second lens has negative optical power, the first side surface and the second side surface of the first lens are convex, the second side surface of the second lens is concave, the first side surface of the third lens is convex, and the first side surface of the fourth lens is convex, and 0.3≤d 前 / TTL≤1 and 0.01≤d2 / TTL≤0.1, by controlling the ratio of the lens length before the aperture to the total lens length, it is beneficial to improve the focusing ability of the lens group before the aperture to the light, reduce the focusing pressure of the lens group behind the aperture, so that the convergent optical path behind the aperture is smaller, which is beneficial to reduce the volume of the lens group and achieve miniaturization; controlling the ratio of the air gap between the first lens and the second lens to the total lens length is beneficial to make the large field of view light from the first lens to the second lens transition smoothly, which is beneficial to reduce the sensitivity of the lens. Therefore, the optical lens provided by the present application has at least one beneficial effect of miniaturization, small aperture, low sensitivity, high luminous flux, high resolution, short back focus and small distortion. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings. In the drawings:

[0034] Figure 1 A schematic structural diagram of an optical lens according to Embodiment 1 of the present application is shown;

[0035] Figure 2 shows a modulation transfer function curve of the optical lens according to Example 1 of the present application;

[0036] Figure 3 A schematic structural diagram of an optical lens according to Embodiment 2 of the present application is shown;

[0037] Figure 4 shows a modulation transfer function curve of the optical lens according to Example 2 of the present application;

[0038] Figure 5 A schematic structural diagram of an optical lens according to Embodiment 3 of the present application is shown;

[0039] Figure 6 shows a modulation transfer function curve of the optical lens according to Example 3 of the present application;

[0040] Figure 7 A schematic structural diagram of an optical lens according to Embodiment 4 of the present application is shown;

[0041] Figure 8 shows a modulation transfer function curve of the optical lens according to Example 4 of the present application;

[0042] Fig. 9 A schematic structural diagram of an optical lens according to Embodiment 5 of the present application is shown;

[0043] Fig.10 shows a modulation transfer function curve of the optical lens according to Example 5 of the present application;

[0044] Fig.11 A schematic structural diagram of an optical lens according to Embodiment 6 of the present application is shown;

[0045] Fig.12 shows a modulation transfer function curve of the optical lens according to Example 6 of the present application;

[0046] Fig.13 A schematic structural diagram of an optical lens according to Embodiment 7 of the present application is shown;

[0047] Fig.14 shows a modulation transfer function curve of the optical lens according to Example 7 of the present application;

[0048] Fig.15 A schematic structural diagram of an optical lens according to Example 8 of the present application is shown;

[0049] Fig.16 shows a modulation transfer function curve of the optical lens according to Example 8 of the present application;

[0050] Fig.17 A schematic structural diagram of an optical lens according to Example 9 of the present application is shown;

[0051] Fig.18 shows a modulation transfer function curve of the optical lens according to Example 9 of the present application;

[0052] Fig.19 A schematic structural diagram of an optical lens according to Embodiment 10 of the present application is shown;

[0053] Fig. 20 shows a modulation transfer function curve of the optical lens according to Example 10 of the present application;

[0054] Fig.21 A schematic structural diagram of an optical lens according to Example 11 of the present application is shown;

[0055] Fig. 22 shows a modulation transfer function curve of the optical lens according to Example 11 of the present application;

[0056] Fig.23 A schematic structural diagram of an optical lens according to Embodiment 12 of the present application is shown;

[0057] Fig.24 The modulation transfer function curve of the optical lens according to Example 12 of the present application is shown. DETAILED DESCRIPTION

[0058] In order to facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and do not limit the scope of the present application in any way. Throughout the specification, the same figure numbers refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0059] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0060] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0061] In this article, the paraxial area refers to the area near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial area; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial area. The judgment of the surface type in the paraxial area can be judged according to the general method in this field, for example, judging the concave and convex by the positive and negative R value (R refers to the radius of curvature of the paraxial area). In this article, the surface of each lens closest to the subject is called the object side of the lens, and the surface of each lens closest to the imaging side is called the image side of the lens. For the object side, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the image side, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface.

[0062] It should be understood that the optical lens provided in the present application can be used for both video and projection, and can also be used for laser radar lenses. When the optical lens provided in the present application is used for a camera lens or a laser radar receiving end lens, the "first side" referred to in this article may refer to the object side, and the "second side" may refer to the image side. The light from the object side can be imaged on the image side, for example, 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 the present application is used for a projection lens or a radar transmitting end lens, the "first side" referred to in this article may refer to the object side, and the "second side" may refer to the light source side. The light from the light source side is projected to the first side after passing through the optical lens, for example, an image can be formed on the first side or an illuminated area can be illuminated.

[0063] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0064] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0065] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0066] The features, principles and other aspects of the present application are described in detail below.

[0067] In an exemplary embodiment, the optical lens includes, for example, four lenses having optical power, namely, a first lens, a second lens, a third lens, and a fourth lens, and the four lenses are arranged in sequence from the first side to the second side along the optical axis.

[0068] In an exemplary embodiment, the optical lens provided in the present application can be used as, for example, a vehicle-mounted lens or a laser radar receiving end lens. In this case, the first side of the optical lens can be the object side, and the second side can be the image side. Light from the object side can be imaged on the image side, for example. The second side of the optical lens can be provided with an imaging surface of the optical lens. In this case, the total optical length TTL of the optical lens is the distance from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis.

[0069] In an exemplary embodiment, the optical lens may further include a photosensitive element disposed on the second side surface. Optionally, the photosensitive element disposed on the second side surface may be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS).

[0070] In an exemplary embodiment, the optical lens provided in the present application can be used as, for example, a projection lens or a laser radar transmitting end lens. In this case, the first side of the optical lens can be the object side, and the second side can be the image side or the light source side. Light from the image side or the light source side passes through the optical lens and is projected to the object side. For example, an image can be formed on the object side or an illuminated area can be illuminated. The second side of the optical lens can be provided with an image surface or a light source surface of the optical lens. In this case, the total optical length TTL of the optical lens is the distance from the center of the first side surface of the first lens to the image surface or the light source surface of the optical lens on the optical axis.

[0071] In an exemplary embodiment, the first lens has positive power, and its first side is convex, and its second side is convex. The first lens has positive power, which is conducive to collecting light with a large field of view. The first side (object side) is convex, which has a beautiful appearance in actual use and is not easy to accumulate dust; the second side (image side) is convex, which can further compress the beam aperture of the large field of view received by the first side (object side), which is conducive to increasing the amount of light and improving the illumination.

[0072] In an exemplary embodiment, the second lens has negative optical power, its first side surface is convex, and its second side surface is concave. The second lens has negative optical power, the first side surface (object side) is convex, which is conducive to collecting and smoothing the light passing through the first lens, and the second side surface (image side) is concave, which diverges the light to pass through the rear lens group, and cooperates with the first lens with positive optical power to reduce aberrations.

[0073] In an exemplary embodiment, the second lens has negative optical power, and its first side surface is concave, and the second side surface is concave. The second lens has negative optical power, has a divergent effect on light, and can adjust the light deflection angle. The second lens is a biconcave type, which can better diverge light and cooperate with the first lens with positive optical power to reduce aberrations; the first side surface (object side) is a concave surface that cooperates with the first lens to collect and diverge the edge field light, and the second side surface (image side) is a concave surface, which can reduce the light deflection angle, which is conducive to smoothing the light trend and reducing sensitivity.

[0074] In an exemplary embodiment, the third lens has positive optical power, and its first side surface is convex, and its second side surface is convex. The third lens has positive optical power, and with a biconvex type, it can better collect the divergent light of the second lens, and converge the light, reducing the light convergence pressure of the rear lens group.

[0075] In an exemplary embodiment, the third lens has positive power, a first side surface thereof is a convex surface, and a second side surface is a plane surface. The third lens has positive power and is a convex-planar lens convex to the first side (object side), and the first side surface (object side surface) can collect and converge the divergent light of the second lens; the second side surface (image side surface) is a plane surface, which is conducive to maintaining the light trend through the third lens, thereby reducing sensitivity.

[0076] In an exemplary embodiment, the third lens has positive optical power, its first side surface is convex, and its second side surface is concave. The third lens has positive optical power, and its first side surface (object side) is convex, which can collect the divergent light of the second lens and converge it; the third lens with convex-concave surface type also makes the light transition smoothly during the convergence process, thereby reducing sensitivity.

[0077] In an exemplary embodiment, the fourth lens has positive power, and its first side surface is convex and its second side surface is concave. The fourth lens has positive power and can collect and focus light from the front lens group. The fourth lens with a convex-concave surface can better converge light, which is conducive to reducing the back focus, thereby reducing the volume of the entire lens group.

[0078] In an exemplary embodiment, the fourth lens has positive power, a first side surface thereof is a convex surface, and a second side surface is a plane surface. The fourth lens has positive power and is a convex-planar lens convex to the first side (object side), and the first side surface (object side surface) can collect and converge the divergent light of the third lens; the second side surface (image side surface) is a plane surface, which is conducive to maintaining the light trend through the fourth lens, thereby reducing sensitivity.

[0079] In an exemplary embodiment, the fourth lens has positive power, and its first side surface is convex, and its second side surface is convex. The fourth lens has positive power, can collect and focus light from the front lens group, and can increase its contribution to the focusing system with a biconvex type, thereby reducing the volume of other lenses to reduce costs.

[0080] In an exemplary embodiment, the first side surface and the second side surface of the first lens and the second lens are aspherical mirror surfaces. The curvature of each position of the aspherical surface is different, which is beneficial to correcting system aberrations and field curvature and improving the resolution of the optical system.

[0081] In an exemplary embodiment, the optical lens according to the present application may further include an aperture located on the second side of the second lens. Exemplarily, the aperture may be disposed between the second lens and the third lens, or between the third lens and the fourth lens. The aperture is located in the middle or back (towards the second side) of the optical system, which is conducive to a smooth transition of light and reduces the sensitivity of the lens group. However, it should be noted that the position of the aperture disclosed herein is only an example and not a limitation; in alternative embodiments, the aperture may also be disposed at other positions according to actual needs.

[0082] In an exemplary embodiment, the second side surface of the second lens is a concave surface, and the first side surface of the third lens is a convex surface. The concave surface of the second lens can wrap the third lens, which is beneficial to reduce the aberration of the edge light and improve the imaging quality.

[0083] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.3≤d 前 / TTL≤1, where d 前 is the distance from the center of the first side surface of the first lens to the aperture on the optical axis, and TTL is the total optical length of the optical lens. 前 / TTL≤1, by controlling the ratio of the lens length before the aperture to the total lens length within this range, it is beneficial to improve the focusing ability of the lens group before the aperture to the light, and reduce the focusing pressure of the lens group behind the aperture, so that the convergent optical path behind the aperture is smaller, which is beneficial to reduce the volume of the lens group and achieve miniaturization. More specifically, d 前 And TTL can further satisfy 0.45≤d 前 / TTL≤0.75, and can further meet 0.54≤d 前 / TTL≤0.73, which is conducive to better miniaturization.

[0084] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.01≤d2 / TTL≤0.1, wherein d2 is the air gap between the first lens and the second lens on the optical axis, and TTL is the total optical length of the optical lens. Satisfying 0.01≤d2 / TTL≤0.1 and controlling the ratio of the air gap between the first lens and the second lens to the total length of the lens within this range is conducive to smoothing the large field of view light transition from the first lens to the second lens, and is conducive to reducing the sensitivity of the lens. More specifically, d2 and TTL may further satisfy 0.025≤d2 / TTL≤0.095, and may further satisfy 0.03≤d2 / TTL≤0.09, which is conducive to better reducing the sensitivity of the lens.

[0085] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.7≤(H / 2) / (F×tan(FOV / 2))≤1.2, wherein F is the total effective focal length of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, and FOV is the maximum field of view of the optical lens. Satisfying 0.7≤(H / 2) / (F×tan(FOV / 2))≤1.2 is conducive to achieving small distortion, and the closer the ratio of the actual image height to the ideal image height, the smaller the distortion of the optical system. More specifically, F, H and FOV may further satisfy 0.92≤(H / 2) / (F×tan(FOV / 2))≤0.99, and may further satisfy 0.93≤(H / 2) / (F×tan(FOV / 2))≤0.97.

[0086] In an exemplary embodiment, the optical lens according to the present application may satisfy: 50≤(FOV×F) / H≤70, where FOV is the maximum field of view of the optical lens, F is the total effective focal length of the optical lens, and H is the image height corresponding to the maximum field of view of the optical lens. Satisfying 50≤(FOV×F) / H≤70 is conducive to simultaneously satisfying the characteristics of telephoto and large field of view. More specifically, FOV, F and H may further satisfy 56≤(FOV×F) / H≤61, and may further satisfy 57.81≤(FOV×F) / H≤59.89.

[0087] In an exemplary embodiment, the optical lens according to the present application may satisfy: F / TTL≥0.3, wherein F is the total effective focal length of the optical lens, and TTL is the distance from the center of the first side surface of the first lens to the last optical surface of the optical lens on the optical axis. Satisfying F / TTL≥0.3 and controlling the ratio of the focal length of the entire lens group to the total length of the lens to be greater than a certain value is conducive to making the energy of the central field of view light after passing through the lens group more concentrated, which can effectively improve the central illumination. More specifically, F and TTL may further satisfy 0.42≤F / TTL≤0.52, and may further satisfy 0.43≤F / TTL≤0.50, which is conducive to better achieving high central illumination.

[0088] In an exemplary embodiment, the optical lens according to the present application may satisfy: F / H ≥ 1, where F is the total effective focal length of the optical lens, and H is the image height corresponding to the maximum field angle of the optical lens. When F / H ≥ 1 is satisfied, the ratio of the system focal length to the image height is determined according to the range of the field of view. When the focal length is greater than the image height, it is beneficial to reduce the aberration of the edge light after passing through the optical system, thereby improving the resolution. More specifically, F and H may further satisfy 1.8 ≤ F / H ≤ 2.5, and may further satisfy 1.92 ≤ F / H ≤ 2.37, which is beneficial to better achieve high resolution.

[0089] In an exemplary embodiment, the optical lens according to the present application may satisfy: BFL / TTL≤0.3, wherein BFL is the distance on the optical axis from the center of the second side surface of the fourth lens to the imaging surface of the optical lens, and TTL is the total optical length of the optical lens. Satisfying BFL / TTL≤0.3 may have the characteristic of short back focus, which is conducive to meeting the requirements of high luminous flux of the optical lens, and may also reduce the volume of the overall lens module and save space. More specifically, BFL and TTL may further satisfy BFL / TTL≤0.13, and may further satisfy 0.05≤BFL / TTL≤0.11, which is conducive to further realizing the characteristic of short back focus.

[0090] In an exemplary embodiment, the optical lens according to the present application may satisfy: -0.01≤ 前 / ≤1, where 前 is the combined focal power of all lenses located on the first side of the aperture, is the total focal length of the optical lens. Satisfies -0.01≤ 前 / ≤1, by controlling the proportion of the focal power of the lens group before the aperture to the focal power of the entire lens within this range, it is beneficial to improve the light collection ability of the lens group before the aperture to collect light in a larger field of view and achieve the characteristics of a large field of view. More specifically, 前 and Further, it can satisfy -0.007≤ 前 / ≤0.8, and can further meet -0.006≤ 前 / ≤0.66, which is conducive to better realizing the characteristics of a large field of view.

[0091] In an exemplary embodiment, the optical lens according to the present application may satisfy: |ST-Fobj| / F≥0.7, wherein |ST-Fobj| is the distance from the aperture of the optical lens to the focal plane of the first side of the optical lens, and F is the total effective focal length of the optical lens. Satisfying |ST-Fobj| / F≥0.7 and controlling the ratio of the distance from the aperture to the focal plane of the first side (object side) of the lens group to the total effective focal length of the lens may help to make the trend of the marginal light as gentle as possible at the place where the light is deflected more, thereby reducing the sensitivity of the lens. More specifically, |ST-Fobj| and F may further satisfy 0.8≤|ST-Fobj| / F≤1.9, and may further satisfy 0.93≤|ST-Fobj| / F≤1.65, which may help to better reduce the sensitivity of the lens.

[0092] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.5≤DST / F≤1.5, where DST is the full aperture of the diaphragm, and F is the total effective focal length of the optical lens. Satisfying 0.5≤DST / F≤1.5 makes the ratio of the diaphragm aperture to the effective focal length larger. The larger the diaphragm aperture, the larger the lens aperture and the higher the luminous flux. More specifically, DST and F may further satisfy 0.88≤DST / F≤1.45, and may further satisfy 0.92≤DST / F≤1.25, which is conducive to better achieving high flux.

[0093] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.3≤DST / D1≤0.9, wherein DST is the full aperture of the aperture, and D1 is the maximum aperture of the first side of the first lens. Satisfying 0.3≤DST / D1≤0.9 and controlling the ratio of the aperture of the aperture to the aperture of the first side of the first lens within this range is conducive to improving the focusing ability of the lens group in front of the aperture to the light, and converging the large field of view light collected by the first lens and transmitting it to the lens group behind the aperture, thereby increasing the light transmission capacity of the system. More specifically, DST and D1 may further satisfy 0.44≤DST / D1≤0.78, and may further satisfy 0.54≤DST / D1≤0.73, which is conducive to better improving the light transmission capacity of the system.

[0094] In an exemplary embodiment, the optical lens according to the present application may satisfy: |R8 / F|≥0.5, where R8 is the radius of curvature of the second side of the fourth lens, and F is the total effective focal length of the optical lens. Satisfying |R8 / F|≥0.5 and controlling the ratio of the radius of curvature of the second side of the fourth lens to the total effective focal length of the lens to be greater than a certain value is beneficial for the fourth lens to converge the light in front, thereby reducing the back focus and saving module space. More specifically, R8 and F may further satisfy 0.5≤|R8 / F|≤6, and may further satisfy 0.84≤|R8 / F|≤4.92, which is beneficial for better achieving the characteristics of short back focus.

[0095] In an exemplary embodiment, the optical lens according to the present application may satisfy: -1≤R7 / R8≤1.5, wherein R7 is the radius of curvature of the first side surface of the fourth lens, and R8 is the radius of curvature of the second side surface of the fourth lens. Satisfying -1≤R7 / R8≤1.5 and controlling the curvature ratio of the first side surface (object side surface) to the second side surface (image side surface) of the fourth lens within this range is beneficial to adjusting the deflection angle of the light entering the fourth lens, focusing each field of view light to the image plane, and increasing the light throughput of the system. More specifically, R7 and R8 may further satisfy -0.5≤R7 / R8≤1, and may further satisfy -0.17≤R7 / R8≤0.77, which is beneficial to better achieve high light throughput.

[0096] In an exemplary embodiment, the optical lens according to the present application may satisfy: F1 / F≥1, where F1 is the effective focal length of the first lens and F is the total effective focal length of the optical lens. Satisfying F1 / F≥1 and reasonably increasing the focal length of the first lens is conducive to adjusting the deflection of the central light and the edge light of each field of view, facilitating the collection of light with a large field of view angle, and realizing the characteristics of a large field of view. More specifically, F1 and F may further satisfy F1 / F≥1.1, and may further satisfy 1.14≤F1 / F≤1.25, which is conducive to better realizing the characteristics of a large field of view.

[0097] In an exemplary embodiment, the optical lens according to the present application may satisfy: -1.7≤F1 / F2≤-1, wherein F1 is the effective focal length of the first lens, and F2 is the effective focal length of the second lens. When -1.7≤F1 / F2≤-1 is satisfied, the first lens and the second lens are provided with opposite optical focal lengths, and at the same time, the focal length of the first lens is relatively large, so that the first lens and the second lens achieve focal length compensation, which is beneficial to improve the thermal compensation of the system. More specifically, F1 and F2 may further satisfy -1.7≤F1 / F2≤-1.3, and may further satisfy -1.70≤F1 / F2≤-1.41, which is beneficial to further improve the thermal compensation of the system.

[0098] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.5≤d 前 / d 后 ≤3, where d 前 is the distance from the center of the first side surface of the first lens to the aperture on the optical axis, d 后 The distance from the aperture to the imaging surface of the optical lens on the optical axis. Satisfies 0.5≤d 前 / d 后 ≤3, by controlling the ratio of the lens length before and after the aperture within this range, it is helpful to ensure that the light transitions smoothly through the aperture, thereby reducing the sensitivity of the lens. More specifically, d 前 and d 后 Further, it can satisfy 0.9≤d 前 / d 后 ≤2.9, and can further satisfy 1.17≤d 前 / d 后 ≤2.69, which helps to better reduce the sensitivity of the lens.

[0099] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.03≤d3 / TTL≤0.2, wherein d3 is the center thickness of the second lens on the optical axis, and TTL is the total optical length of the optical lens. Satisfying 0.03≤d3 / TTL≤0.2 and controlling the ratio of the thickness of the second lens to the total length of the lens within this range is conducive to balancing the ratio of the expansion of the second lens with negative optical power at high and low temperatures to the total expansion of the lens, so that the thermal compensation performance is better. More specifically, d3 and TTL may further satisfy 0.05≤d3 / TTL≤0.15, and may further satisfy 0.07≤d3 / TTL≤0.13, which is conducive to better improving the thermal compensation performance.

[0100] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.11≤d3 / F≤0.45, wherein d3 is the center thickness of the second lens on the optical axis, and F is the total effective focal length of the optical lens. Satisfying 0.11≤d3 / F≤0.45 and controlling the ratio of the thickness of the second lens to the total effective focal length of the lens within this range is conducive to increasing the contribution of the focal length of the second lens to the focal length of the entire lens, thereby reducing spherical aberration and improving resolution. More specifically, d3 and F may further satisfy 0.15≤d3 / F≤0.26, and may further satisfy 0.18≤d3 / F≤0.26, which is conducive to better achieving high resolution.

[0101] In an exemplary embodiment, the optical lens according to the present application may satisfy: -1≤(R2-R3) / (R2+R3)≤7.2, wherein R2 is the radius of curvature of the second side surface of the first lens, and R3 is the radius of curvature of the first side surface of the second lens. By satisfying -1≤(R2-R3) / (R2+R3)≤7.2, by controlling the difference in curvature between the second side surface (image side surface) of the first lens and the first side surface (object side surface) of the second lens within this range, the spherical aberration caused by the large-angle light collected by the first lens can be effectively corrected, thereby improving the resolution of the lens. More specifically, R2 and R3 may further satisfy -0.7≤(R2-R3) / (R2+R3)≤6, and may further satisfy -0.82≤(R2-R3) / (R2+R3)≤5.80, which is conducive to better improving the resolution of the lens.

[0102] In an exemplary embodiment, the optical lens according to the present application may satisfy: -20mm≤1 / (1 / R3-1 / R4)≤0mm, R3 is the radius of curvature of the first side surface of the second lens, and R4 is the radius of curvature of the second side surface of the second lens. Satisfying -20mm≤1 / (1 / R3-1 / R4)≤0mm and controlling the difference in curvature between the first side surface (object side surface) and the second side surface (image side surface) of the second lens within this range is conducive to adjusting the deflection angle of the light entering the second lens, diverging the light rays of each field of view and inputting them into the rear optical system, thereby increasing the light transmission capacity of the system. More specifically, R3 and R4 may further satisfy -15mm≤1 / (1 / R3-1 / R4)≤-7mm, and may further satisfy -12.06mm≤1 / (1 / R3-1 / R4)≤-8.67mm, which is conducive to better improving the light transmission capacity of the system.

[0103] In an exemplary embodiment, the edge angle arctan(1 / K(S4)) of the second side surface of the second lens of the optical lens according to the present application at the maximum field angle of the optical lens satisfies: arctan(1 / K(S4))≥30°, and the second side surface (image side surface) of the second lens has a large angle, which is conducive to the rapid divergence of large-angle peripheral light emitted by the second lens, thereby improving the imaging quality. More specifically, arctan(1 / K(S4)) may further satisfy arctan(1 / K(S4))≥35°, and may further satisfy 39.69°≤arctan(1 / K(S4))≤60.14°.

[0104] In an exemplary embodiment, the optical lens according to the present application may satisfy: |SAG6 / SAG5|≤1.5, wherein SAG5 is the sagittal height corresponding to the first side surface of the third lens at the maximum field of view angle of the optical lens, and SAG6 is the sagittal height corresponding to the second side surface of the third lens at the maximum field of view angle of the optical lens. Satisfying |SAG6 / SAG5|≤1.5 and controlling the sagittal height of the first side surface of the third lens to be greater than the sagittal height of the second side surface is beneficial to the smooth transition of light and reduces the sensitivity of the lens group. More specifically, SAG6 and SAG5 may further satisfy |SAG6 / SAG5|≤1, and may further satisfy 0.08≤|SAG6 / SAG5|≤0.74, which is beneficial to better reduce the sensitivity of the lens group.

[0105] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0≤|R2 / F|≤1.2, wherein R2 is the radius of curvature of the second side of the first lens, and F is the total effective focal length of the optical lens. Satisfying 0≤|R2 / F|≤1.2 and controlling the ratio of the radius of curvature of the second side of the first lens to the total effective focal length of the lens within this range is beneficial for converging the light rays with a large field of view after the first side of the first lens collects the light rays, while reducing spherical aberration, thereby improving the resolution of the lens. More specifically, R2 and F may further satisfy 0.6≤|R2 / F|≤1, and may further satisfy 0.73≤|R2 / F|≤0.99, which is beneficial for better improving the resolution of the lens.

[0106] In an exemplary embodiment, the optical lens according to the present application may satisfy: d4 / TTL≥0.05, wherein d4 is the air gap between the second lens and the third lens on the optical axis, and TTL is the total optical length of the optical lens. When d4 / TTL≥0.05 is satisfied, the ratio of the air gap between the second lens and the third lens to the total length of the lens is greater than a certain value, which is conducive to smoothing the trend of light rays diverged by the second lens and then focused by the third lens, and reducing the sensitivity of the lens in the optical system. More specifically, d4 and TTL may further satisfy d4 / TTL≥0.06, and may further satisfy 0.08≤d4 / TTL≤0.23, which is conducive to better reducing the sensitivity of the lens.

[0107] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.1≤ 34 / ≤2.5, where 34 is the combined focal length of the third lens and the fourth lens, is the total focal length of the optical lens. Satisfies 0.1≤ 34 / ≤2.5, the ratio of the combined focal length of the third lens and the fourth lens to the total focal length of the lens is within the above range, which can focus the light emitted by the front lens group and increase the light transmission capacity of the system. More specifically, 34 and Further, it can satisfy 1.3≤ 34 / ≤2, and can further meet 1.52≤ 34 / ≤1.75, which is conducive to better achieving high luminous flux.

[0108] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.2≤F3 / F4≤2, wherein F3 is the effective focal length of the third lens, and F4 is the effective focal length of the fourth lens. Satisfying 0.2≤F3 / F4≤2, by controlling the ratio of the focal lengths of the third lens and the fourth lens, adjusting the light trend of the main light focused by the third lens and the fourth lens, so that the image height on the image plane is close to the ideal image height, is conducive to achieving small distortion. More specifically, F3 and F4 may further satisfy 0.3≤F3 / F4≤1.5, and may further satisfy 0.47≤F3 / F4≤1.37, which is conducive to better achieving small distortion.

[0109] In an exemplary embodiment, the maximum field of view FOV of the optical lens according to the present application satisfies: 27.8°≤FOV≤30.6°.

[0110] In an exemplary embodiment, the aperture number FNO of the optical lens according to the present application satisfies: 0.60≤FNO≤0.65, and has the characteristic of a large aperture.

[0111] In an exemplary embodiment, the first lens to the fourth lens may be a spherical lens or an aspherical lens. The present application does not specifically limit the specific number of spherical lenses and aspherical lenses. When focusing on imaging quality, the number of aspherical lenses can be increased, or even all lenses use aspherical lenses. Exemplarily, the first lens and the second lens of the present application may be aspherical lenses, and the third lens and the fourth lens may be spherical lenses. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After using an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality of the lens.

[0112] In an exemplary embodiment, the first lens to the fourth lens may be a glass lens or a plastic lens. The present application does not specifically limit the specific number of glass lenses and plastic lenses. An optical lens made of glass can suppress the deviation of the back focus of the optical lens with temperature changes to improve the stability of the system. At the same time, the use of glass material can avoid problems such as lens imaging blur caused by high and low temperature changes in the use environment and affecting the normal use of the lens. Specifically, when focusing on temperature performance, the first lens to the fourth lens can all be made of glass. In applications where temperature stability requirements are lower, the first lens to the fourth lens in the optical lens can also be made of plastic. Making optical lenses with plastic can effectively reduce production costs. Of course, the first lens to the fourth lens in the optical lens can also be made of a combination of plastic and glass.

[0113] According to the above-mentioned embodiment of the present application, the optical lens can have at least one beneficial effect of miniaturization, small aperture, low sensitivity, high luminous flux, high resolution, short back focus and small distortion by reasonably setting parameters such as lens shape and optical focal length.

[0114] However, it should be understood by those skilled in the art that, without departing from the technical solution claimed in the present application, the number of lenses constituting the lens can be changed to obtain the various results and advantages described in this specification. For example, although four lenses are described as an example in the embodiment, the optical lens is not limited to including four lenses. If necessary, the optical lens may also include other numbers of lenses. The following further describes a specific embodiment of the optical lens applicable to the above-mentioned embodiment with reference to the accompanying drawings.

[0115] Example 1

[0116] The following reference Figure 1 An optical lens according to Embodiment 1 of the present application is described. Figure 1 A schematic structural diagram of an optical lens according to Example 1 of the present application is shown.

[0117] like Figure 1 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4 in sequence from the first side to the second side along the optical axis.

[0118] The first lens L1 is a convex-convex lens with positive focal power, whose first side surface S1 is convex and whose second side surface S2 is convex. The second lens L2 is a convex-concave lens with negative focal power, whose first side surface S3 is convex and whose second side surface S4 is concave. The third lens L3 is a convex-convex lens with positive focal power, whose first side surface S5 is convex and whose second side surface S6 is convex. The fourth lens L4 is a convex-concave lens with positive focal power, whose first side surface S7 is convex and whose second side surface S8 is concave.

[0119] The optical lens may further include a stop STO, and the stop STO may be disposed between the second lens L2 and the third lens L3.

[0120] Table 1 shows the radius of curvature R, thickness / distance (it should be understood that the thickness / distance of the row where S1 is located is the center thickness of the first lens L1, the thickness / distance of the row where S2 is located is the spacing distance between the second side surface S2 of the first lens L1 and the first side surface S3 of the second lens L2, the thickness / distance of the row where S3 is located is the center thickness of the second lens L2, and so on), refractive index Nd, and Abbe number Vd of each lens of the optical lens of Example 1.

[0121] Table 1

[0122]

[0123] In Example 1, the first side surface of the first lens L1 and the second side surface of the second lens L2 are both aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0124] (1)

[0125] Wherein, x is the distance vector height from the vertex of the aspherical surface when the aspherical surface is at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below gives the cone coefficient k and the high-order coefficients A4, A6, A8, A10, A12, A14 and A16 that can be used for each aspherical mirror surface in Example 1.

[0126] Table 2

[0127]

[0128] Figure 2 The modulation transfer function (MTF) curve of the central field of view of the optical lens of Example 1 is shown. MTF stands for modulation transfer function, which describes the ability of the optical lens to "restore" the object side in the image side. The horizontal axis of the modulation transfer function (MTF) curve is the spatial frequency, and the unit of the spatial frequency is cycles per millimeter (lp / mm). The vertical axis represents the optical modulation function value (MTF value). The MTF value is a value between 0 and 1. The larger the value (the closer to 1), the stronger the ability of the lens to restore the reality. According to Figure 2 It can be seen that the MTF value of the central field of view of the optical lens of Example 1 at the spatial frequency of 12.5 lp / mm (12.5 cycles / mm) is greater than 0.4.

[0129] Example 2

[0130] The following reference Figure 3 The optical lens according to Embodiment 2 of the present application is described. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to Embodiment 1 will be omitted. Figure 3 A schematic structural diagram of an optical lens according to Embodiment 2 of the present application is shown.

[0131] like Figure 3 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4 in sequence from the first side to the second side along the optical axis.

[0132] The first lens L1 is a convex-convex lens with positive focal power, whose first side surface S1 is convex and whose second side surface S2 is convex. The second lens L2 is a convex-concave lens with negative focal power, whose first side surface S3 is convex and whose second side surface S4 is concave. The third lens L3 is a convex-convex lens with positive focal power, whose first side surface S5 is convex and whose second side surface S6 is convex. The fourth lens L4 is a convex-concave lens with positive focal power, whose first side surface S7 is convex and whose second side surface S8 is concave.

[0133] The optical lens may further include a stop STO, and the stop STO may be disposed between the third lens L3 and the fourth lens L4.

[0134] Table 3 shows the radius of curvature R, thickness / distance, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 2. Table 4 shows the conic coefficient and high-order coefficient of each aspheric mirror surface that can be used in Example 2, wherein each aspheric surface shape can be defined by the formula (1) given in the above Example 1.

[0135] Table 3

[0136]

[0137] Table 4

[0138]

[0139] Figure 4 The modulation transfer function (MTF) curve of the central field of view of the optical lens of Example 2 is shown. Figure 4 It can be seen that the MTF value of the central field of view of the optical lens of Example 2 at the spatial frequency of 12.5 lp / mm (12.5 cycles / mm) is greater than 0.4.

[0140] Example 3

[0141] The following reference Figure 5 An optical lens according to Example 3 of the present application is described. Figure 5 A schematic structural diagram of an optical lens according to Example 3 of the present application is shown.

[0142] like Figure 5 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4 in sequence from the first side to the second side along the optical axis.

[0143] The first lens L1 is a convex-convex lens with positive focal power, whose first side surface S1 is convex and whose second side surface S2 is convex. The second lens L2 is a concave-concave lens with negative focal power, whose first side surface S3 is concave and whose second side surface S4 is concave. The third lens L3 is a convex-convex lens with positive focal power, whose first side surface S5 is convex and whose second side surface S6 is convex. The fourth lens L4 is a convex-concave lens with positive focal power, whose first side surface S7 is convex and whose second side surface S8 is concave.

[0144] The optical lens may further include a stop STO, and the stop STO may be disposed between the second lens L2 and the third lens L3.

[0145] Table 5 shows the radius of curvature R, thickness / distance, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 3. Table 6 shows the conic coefficient and high-order coefficient of each aspheric mirror surface that can be used in Example 3, wherein each aspheric surface shape can be defined by the formula (1) given in the above Example 1.

[0146] Table 5

[0147]

[0148] Table 6

[0149]

[0150] Figure 6 The modulation transfer function (MTF) curve of the central field of view of the optical lens of Example 3 is shown. Figure 6 It can be seen that the MTF value of the central field of view of the optical lens of Example 3 at the spatial frequency of 12.5 lp / mm (12.5 cycles / mm) is greater than 0.4.

[0151] Example 4

[0152] The following reference Figure 7 An optical lens according to Example 4 of the present application is described. Figure 7 A schematic structural diagram of an optical lens according to Example 4 of the present application is shown.

[0153] like Figure 7 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4 in sequence from the first side to the second side along the optical axis.

[0154] The first lens L1 is a convex-convex lens with positive focal power, whose first side surface S1 is convex and whose second side surface S2 is convex. The second lens L2 is a concave-concave lens with negative focal power, whose first side surface S3 is concave and whose second side surface S4 is concave. The third lens L3 is a convex-convex lens with positive focal power, whose first side surface S5 is convex and whose second side surface S6 is convex. The fourth lens L4 is a convex-concave lens with positive focal power, whose first side surface S7 is convex and whose second side surface S8 is concave.

[0155] The optical lens may further include a stop STO, and the stop STO may be disposed between the third lens L3 and the fourth lens L4.

[0156] Table 7 shows the radius of curvature R, thickness / distance, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 4. Table 8 shows the conic coefficient and high-order coefficient of each aspheric mirror surface that can be used in Example 4, wherein each aspheric surface shape can be defined by the formula (1) given in the above Example 1. The first side surface S3 of the second lens L2 has an inflection point.

[0157] Table 7

[0158]

[0159] Table 8

[0160]

[0161] Figure 8 The modulation transfer function (MTF) curve of the central field of view of the optical lens of Example 4 is shown. Figure 8It can be seen that the MTF value of the central field of view of the optical lens of Example 4 at the spatial frequency of 12.5 lp / mm (12.5 cycles / mm) is greater than 0.4.

[0162] Example 5

[0163] The following reference Fig. 9 An optical lens according to Example 5 of the present application is described. Fig. 9 A schematic structural diagram of an optical lens according to Example 5 of the present application is shown.

[0164] like Fig. 9 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4 in sequence from the first side to the second side along the optical axis.

[0165] The first lens L1 is a convex-convex lens with positive power, whose first side surface S1 is convex and whose second side surface S2 is convex. The second lens L2 is a convex-concave lens with negative power, whose first side surface S3 is convex and whose second side surface S4 is concave. The third lens L3 is a convex-planar lens with positive power, whose first side surface S5 is convex and whose second side surface S6 is flat. The fourth lens L4 is a convex-concave lens with positive power, whose first side surface S7 is convex and whose second side surface S8 is concave.

[0166] The optical lens may further include a stop STO, and the stop STO may be disposed between the second lens L2 and the third lens L3.

[0167] Table 9 shows the radius of curvature R, thickness / distance, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 5. Table 10 shows the conic coefficient and high-order coefficient of each aspheric mirror surface that can be used in Example 5, wherein each aspheric surface shape can be defined by the formula (1) given in the above Example 1. The second side surface S4 of the second lens L2 and the second side surface S6 of the third lens L3 have an inflection point.

[0168] Table 9

[0169]

[0170] Table 10

[0171]

[0172] Fig.10 The modulation transfer function (MTF) curve of the central field of view of the optical lens of Example 5 is shown. Fig.10 It can be seen that the MTF value of the central field of view of the optical lens of Example 5 at the spatial frequency of 12.5 lp / mm (12.5 cycles / mm) is greater than 0.4.

[0173] Example 6

[0174] The following reference Fig.11 An optical lens according to Example 6 of the present application is described. Fig.11 A schematic structural diagram of an optical lens according to Example 6 of the present application is shown.

[0175] like Fig.11 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4 in sequence from the first side to the second side along the optical axis.

[0176] The first lens L1 is a convex-convex lens with positive power, whose first side surface S1 is convex and whose second side surface S2 is convex. The second lens L2 is a convex-concave lens with negative power, whose first side surface S3 is convex and whose second side surface S4 is concave. The third lens L3 is a convex-planar lens with positive power, whose first side surface S5 is convex and whose second side surface S6 is flat. The fourth lens L4 is a convex-concave lens with positive power, whose first side surface S7 is convex and whose second side surface S8 is concave.

[0177] The optical lens may further include a stop STO, and the stop STO may be disposed between the second lens L2 and the third lens L3.

[0178] Table 11 shows the radius of curvature R, thickness / distance, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 6. Table 12 shows the conic coefficient and high-order coefficient of each aspheric mirror surface that can be used in Example 6, wherein each aspheric surface shape can be defined by the formula (1) given in the above Example 1.

[0179] Table 11

[0180]

[0181] Table 12

[0182]

[0183] Fig.12 The modulation transfer function (MTF) curve of the central field of view of the optical lens of Example 6 is shown. Fig.12 It can be seen that the MTF value of the central field of view of the optical lens of Example 6 at the spatial frequency of 12.5lp / mm (12.5 cycles / mm) is greater than 0.4.

[0184] Example 7

[0185] The following reference Fig.13 An optical lens according to Example 7 of the present application is described. Fig.13 A schematic structural diagram of an optical lens according to Example 7 of the present application is shown.

[0186] like Fig.13 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4 in sequence from the first side to the second side along the optical axis.

[0187] The first lens L1 is a convex-convex lens with positive focal power, whose first side surface S1 is convex and whose second side surface S2 is convex. The second lens L2 is a convex-concave lens with negative focal power, whose first side surface S3 is convex and whose second side surface S4 is concave. The third lens L3 is a convex-concave lens with positive focal power, whose first side surface S5 is convex and whose second side surface S6 is concave. The fourth lens L4 is a convex-concave lens with positive focal power, whose first side surface S7 is convex and whose second side surface S8 is concave.

[0188] The optical lens may further include a stop STO, which may be disposed between the second lens L2 and the third lens L3. Table 13 shows the radius of curvature R, thickness / distance, refractive index Nd, and Abbe number Vd of each lens of the optical lens of Example 7. Table 14 shows the conic coefficient and high-order coefficient of each aspheric mirror surface that can be used in Example 7, wherein each aspheric surface shape can be defined by the formula (1) given in the above Example 1.

[0189] Table 13

[0190]

[0191] Table 14

[0192]

[0193] Fig.14 The modulation transfer function (MTF) curve of the central field of view of the optical lens of Example 7 is shown. Fig.14 It can be seen that the MTF value of the central field of view of the optical lens of Example 7 at the spatial frequency of 12.5lp / mm (12.5 cycles / mm) is greater than 0.4.

[0194] Example 8

[0195] The following reference Fig.15 An optical lens according to Example 8 of the present application is described. Fig.15 A schematic structural diagram of an optical lens according to Example 8 of the present application is shown.

[0196] like Fig.15 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4 in sequence from the first side to the second side along the optical axis.

[0197] The first lens L1 is a convex-convex lens with positive focal power, whose first side surface S1 is convex and whose second side surface S2 is convex. The second lens L2 is a convex-concave lens with negative focal power, whose first side surface S3 is convex and whose second side surface S4 is concave. The third lens L3 is a convex-concave lens with positive focal power, whose first side surface S5 is convex and whose second side surface S6 is concave. The fourth lens L4 is a convex-concave lens with positive focal power, whose first side surface S7 is convex and whose second side surface S8 is concave.

[0198] The optical lens may further include a stop STO, and the stop STO may be disposed between the second lens L2 and the third lens L3.

[0199] Table 15 shows the radius of curvature R, thickness / distance, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 8. Table 16 shows the conic coefficient and high-order coefficient of each aspheric mirror surface that can be used in Example 8, wherein each aspheric surface shape can be defined by the formula (1) given in the above Example 1.

[0200] Table 15

[0201]

[0202] Table 16

[0203]

[0204] Fig.16 The modulation transfer function (MTF) curve of the central field of view of the optical lens of Example 8 is shown. Fig.16 It can be seen that the MTF value of the central field of view of the optical lens of Example 8 at the spatial frequency of 12.5lp / mm (12.5 cycles / mm) is greater than 0.4.

[0205] Example 9

[0206] The following reference Fig.17 An optical lens according to Example 9 of the present application is described. Fig.17 A schematic structural diagram of an optical lens according to Example 9 of the present application is shown.

[0207] like Fig.17 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4 in sequence from the first side to the second side along the optical axis.

[0208] The first lens L1 is a convex-convex lens with positive power, whose first side surface S1 is convex and whose second side surface S2 is convex. The second lens L2 is a convex-concave lens with negative power, whose first side surface S3 is convex and whose second side surface S4 is concave. The third lens L3 is a convex-convex lens with positive power, whose first side surface S5 is convex and whose second side surface S6 is convex. The fourth lens L4 is a convex-plano lens with positive power, whose first side surface S7 is convex and whose second side surface S8 is flat.

[0209] The optical lens may further include a stop STO, and the stop STO may be disposed between the second lens L2 and the third lens L3.

[0210] Table 17 shows the radius of curvature R, thickness / distance, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 9. Table 18 shows the conic coefficient and high-order coefficient of each aspheric mirror surface that can be used in Example 9, wherein each aspheric surface shape can be defined by the formula (1) given in the above Example 1.

[0211] Table 17

[0212]

[0213] Table 18

[0214]

[0215] Fig.18 The modulation transfer function (MTF) curve of the central field of view of the optical lens of Example 9 is shown. Fig.18 It can be seen that the MTF value of the central field of view of the optical lens of Example 9 at the spatial frequency of 12.5lp / mm (12.5 cycles / mm) is greater than 0.4.

[0216] Example 10

[0217] The following reference Fig.19 An optical lens according to Example 10 of the present application is described. Fig.19 A schematic structural diagram of an optical lens according to Example 10 of the present application is shown.

[0218] like Fig.19 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4 in sequence from the first side to the second side along the optical axis.

[0219] The first lens L1 is a convex-convex lens with positive power, whose first side surface S1 is convex and whose second side surface S2 is convex. The second lens L2 is a convex-concave lens with negative power, whose first side surface S3 is convex and whose second side surface S4 is concave. The third lens L3 is a convex-convex lens with positive power, whose first side surface S5 is convex and whose second side surface S6 is convex. The fourth lens L4 is a convex-plano lens with positive power, whose first side surface S7 is convex and whose second side surface S8 is flat.

[0220] The optical lens may further include a stop STO, and the stop STO may be disposed between the second lens L2 and the third lens L3.

[0221] Table 19 shows the radius of curvature R, thickness / distance, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 10. Table 20 shows the conic coefficient and high-order coefficient of each aspheric mirror surface that can be used in Example 10, wherein each aspheric surface shape can be defined by the formula (1) given in the above Example 1.

[0222] Table 19

[0223]

[0224] Table 20

[0225]

[0226] Fig. 20 The modulation transfer function (MTF) curve of the central field of view of the optical lens of Example 10 is shown. Fig. 20 It can be seen that the MTF value of the central field of view of the optical lens of Example 10 at the spatial frequency of 12.5 lp / mm (12.5 cycles / mm) is greater than 0.4.

[0227] Embodiment 11

[0228] The following reference Fig.21 An optical lens according to Example 11 of the present application is described. Fig.21 A schematic structural diagram of an optical lens according to Example 11 of the present application is shown.

[0229] like Fig.21 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4 in sequence from the first side to the second side along the optical axis.

[0230] The first lens L1 is a convex-convex lens with positive focal power, whose first side surface S1 is convex, and whose second side surface S2 is convex. The second lens L2 is a convex-concave lens with negative focal power, whose first side surface S3 is convex, and whose second side surface S4 is concave. The third lens L3 is a convex-convex lens with positive focal power, whose first side surface S5 is convex, and whose second side surface S6 is convex. The fourth lens L4 is a convex-convex lens with positive focal power, whose first side surface S7 is convex, and whose second side surface S8 is convex.

[0231] The optical lens may further include a stop STO, and the stop STO may be disposed between the second lens L2 and the third lens L3.

[0232] Table 21 shows the radius of curvature R, thickness / distance, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 11. Table 22 shows the conic coefficient and high-order coefficient of each aspheric mirror surface that can be used in Example 11, wherein each aspheric surface shape can be defined by the formula (1) given in the above Example 1.

[0233] Table 21

[0234]

[0235] Table 22

[0236]

[0237] Fig. 22 The modulation transfer function (MTF) curve of the central field of view of the optical lens of Example 11 is shown. Fig. 22 It can be seen that the MTF value of the central field of view of the optical lens of Example 11 at the spatial frequency of 12.5lp / mm (12.5 cycles / mm) is greater than 0.4.

[0238] Example 12

[0239] The following reference Fig.23 An optical lens according to Example 12 of the present application is described. Fig.23 A schematic structural diagram of an optical lens according to Example 12 of the present application is shown.

[0240] like Fig.23 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4 in sequence from the first side to the second side along the optical axis.

[0241] The first lens L1 is a convex-convex lens with positive focal power, whose first side surface S1 is convex, and whose second side surface S2 is convex. The second lens L2 is a convex-concave lens with negative focal power, whose first side surface S3 is convex, and whose second side surface S4 is concave. The third lens L3 is a convex-convex lens with positive focal power, whose first side surface S5 is convex, and whose second side surface S6 is convex. The fourth lens L4 is a convex-convex lens with positive focal power, whose first side surface S7 is convex, and whose second side surface S8 is convex.

[0242] The optical lens may further include a stop STO, and the stop STO may be disposed between the second lens L2 and the third lens L3.

[0243] Table 23 shows the radius of curvature R, thickness / distance, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 12. Table 24 shows the conic coefficient and high-order coefficient of each aspheric mirror surface that can be used in Example 12, wherein each aspheric surface shape can be defined by the formula (1) given in the above Example 1.

[0244] Table 23

[0245]

[0246] Table 24

[0247]

[0248] Fig.24 The modulation transfer function (MTF) curve of the central field of view of the optical lens of Example 12 is shown. Fig.24 It can be seen that the MTF value of the central field of view of the optical lens of Example 12 at the spatial frequency of 12.5lp / mm (12.5 cycles / mm) is greater than 0.4.

[0249] In summary, embodiments 1 to 12 respectively satisfy the relationships shown in Table 25-1 and Table 25-2. In Table 25-1 and Table 25-2, F, TTL, H, BFL, DST, F1~F4, d 前 d 后 The units of D1, SAG5, SAG6, |ST-Fobj| and SAG10 are in millimeters (mm), and the units of FOV and arctan(1 / K(S4)) are in degrees (°). , 34 and 前 The unit is diopter (D).

[0250] Table 25-1

[0251]

[0252] Table 25-2

[0253]

[0254] The optical lens provided in this application can be used as, for example, a vehicle-mounted lens or a laser radar receiving end lens. In this case, Figure 1 , Figure 3 , Figure 5 , Figure 7 , Fig. 9 , Fig.11 , Fig.13 , Fig.15 , Fig.17 , Fig.19 , Fig.21 and Fig.23 IMA may represent an imaging surface, for example, and light from an object sequentially passes through each surface S1 to S8 and is finally imaged on the imaging surface disposed on the second side, wherein an image sensor chip is disposed on the imaging surface. It should be understood that the optical lens provided in the present application may also be used as, for example, a projection lens or a laser radar transmitting end lens. In this case, Figure 1 , Figure 3 , Figure 5 , Figure 7 , Fig. 9 , Fig.11 , Fig.13 , Fig.15 , Fig.17 , Fig.19 , Fig.21 and Fig.23 IMA may represent an image plane or a light source plane, for example. Light from the image plane or the light source plane sequentially passes through the surfaces S8 to S1 and is finally projected to the first side, for example, to form an image or illuminate an area on the first side.

[0255] The present application also provides an electronic device, which may include an optical lens according to the above-mentioned embodiment of the present application and an imaging element for converting an optical image formed by the optical lens into an electrical signal. The electronic device may be an independent electronic device such as a detection distance camera, or an imaging module integrated in a device such as a detection distance device. In addition, the electronic device may also be an independent imaging device such as a vehicle-mounted camera, or an imaging module integrated in a driving assistance system such as a vehicle-mounted camera.

[0256] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other to form a technical solution.

Claims

1. An optical lens, characterized in that: The optical lens includes, in sequence from the first side to the second side along the optical axis: A first lens having positive optical power, wherein the first side surface is convex and the second side surface is convex; A second lens having negative optical power, wherein the second side surface of the second lens is concave; a third lens element having positive power, wherein the first side surface of the third lens element is convex; a fourth lens element having positive power, wherein the first side surface of the fourth lens element is convex; The optical lens further comprises an aperture, and the aperture is located on the second side of the second lens; The distance d from the center of the first side surface of the first lens to the aperture on the optical axis 前 The total optical length TTL of the optical lens satisfies: 0.45≤d 前 / TTL≤1; The air interval d2 between the first lens and the second lens on the optical axis and the total optical length TTL of the optical lens satisfy the following conditions: 0.01≤d2 / TTL≤0.1; The optical lens satisfies: |SAG6 / SAG5|≤1.5, wherein SAG5 is the sag corresponding to the first side surface of the third lens at the maximum field of view angle of the optical lens, and SAG6 is the sag corresponding to the second side surface of the third lens at the maximum field of view angle of the optical lens; The number of lenses having optical power in the optical lens is four.

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

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

4. The optical lens according to claim 1, characterized in that: The second side surface of the third lens is a convex surface, a concave surface or a flat surface.

5. The optical lens according to claim 1, characterized in that: The second side surface of the fourth lens is a convex surface, a concave surface or a flat surface.

6. The optical lens according to any one of claims 1 to 5, characterized in that: The optical lens satisfies: 0.7≤(H / 2) / (F×tan(FOV / 2))≤1.2, wherein F is the total effective focal length of the optical lens, H is the image height corresponding to the maximum field of view angle of the optical lens, and FOV is the maximum field of view angle of the optical lens.

7. The optical lens according to any one of claims 1 to 5, characterized in that: The optical lens meets at least one of the following conditions: 0.52≥F / TTL≥0.3, 2.5≥F / H≥1, Wherein, F is the total effective focal length of the optical lens, and H is the image height corresponding to the maximum field angle of the optical lens.

8. The optical lens according to any one of claims 1 to 5, characterized in that: The optical lens satisfies: 0.05≤BFL / TTL≤0.3, wherein BFL is the distance from the center of the second side surface of the fourth lens to the imaging surface of the optical lens on the optical axis.

9. The optical lens according to any one of claims 1 to 5, characterized in that: The optical lens meets the following requirements: -0.01≤ 前 / ≤1, where 前 is the combined optical power of all lenses located on the first side of the aperture, is the total focal power of the optical lens.

10. The optical lens according to any one of claims 1 to 5, characterized in that: The optical lens satisfies: 1.9≥|ST-Fobj| / F≥0.7, wherein |ST-Fobj| is the distance from the aperture to the first side focal plane of the optical lens, and F is the total effective focal length of the optical lens.

11. The optical lens according to any one of claims 1 to 5, characterized in that: The optical lens meets at least one of the following conditions: 0.5≤DST / F≤1.5, 0.3≤DST / D1≤0.9, Wherein, DST is the full aperture of the aperture, F is the total effective focal length of the optical lens, and D1 is the maximum aperture of the first side surface of the first lens.

12. The optical lens according to any one of claims 1 to 5, characterized in that: The optical lens satisfies: 6≥|R8 / F|≥0.5, wherein R8 is the radius of curvature of the second side surface of the fourth lens, and F is the total effective focal length of the optical lens.

13. The optical lens according to any one of claims 1 to 5, characterized in that: The optical lens satisfies: -1≤R7 / R8≤1.5, wherein R7 is the curvature radius of the first side surface of the fourth lens, and R8 is the curvature radius of the second side surface of the fourth lens.

14. The optical lens according to any one of claims 1 to 5, characterized in that: The optical lens satisfies: 1.25≥F1 / F≥1, wherein F1 is the effective focal length of the first lens, and F is the total effective focal length of the optical lens.

15. The optical lens according to any one of claims 1 to 5, characterized in that: The optical lens satisfies: -1.7≤F1 / F2≤-1, wherein F1 is the effective focal length of the first lens, and F2 is the effective focal length of the second lens.

16. The optical lens according to any one of claims 1 to 5, characterized in that: The optical lens satisfies: 0.5≤d 前 / d 后 ≤3, where d 后 is the distance from the aperture to the imaging surface of the optical lens on the optical axis.

17. The optical lens according to any one of claims 1 to 5, characterized in that: The optical lens satisfies: 0.03≤d3 / TTL≤0.2, wherein d3 is the center thickness of the second lens on the optical axis.

18. The optical lens according to any one of claims 1 to 5, characterized in that: The optical lens satisfies: 0.11≤d3 / F≤0.45, wherein d3 is the center thickness of the second lens on the optical axis, and F is the total effective focal length of the optical lens.

19. The optical lens according to any one of claims 1 to 5, characterized in that: The optical lens satisfies: -1≤(R2-R3) / (R2+R3)≤7.2, wherein R2 is the radius of curvature of the second side surface of the first lens, and R3 is the radius of curvature of the first side surface of the second lens.

20. The optical lens according to any one of claims 1 to 5, characterized in that: The optical lens satisfies: -20mm≤1 / (1 / R3-1 / R4)≤0mm, R3 is the curvature radius of the first side surface of the second lens, and R4 is the curvature radius of the second side surface of the second lens.

21. The optical lens according to any one of claims 1 to 5, characterized in that: The edge angle arctan(1 / K(S4)) of the second side surface of the second lens at the maximum field angle of the optical lens satisfies: 60.14°≥arctan(1 / K(S4))≥30°.

22. The optical lens according to any one of claims 1 to 5, characterized in that: The optical lens satisfies: 0≤|R2 / F|≤1.2, wherein R2 is the radius of curvature of the second side surface of the first lens, and F is the total effective focal length of the optical lens.

23. The optical lens according to any one of claims 1 to 5, characterized in that: The optical lens satisfies: 0.23≥d4 / TTL≥0.05, wherein d4 is the air distance between the second lens and the third lens on the optical axis.

24. The optical lens according to any one of claims 1 to 5, characterized in that: The optical lens meets at least one of the following conditions: 0.1≤ 34 / ≤2.5， 0.2≤F3 / F4≤2, in, 34 is the combined optical power of the third lens and the fourth lens, is the total optical power of the optical lens, F3 is the effective focal length of the third lens, and F4 is the effective focal length of the fourth lens.

25. The optical lens according to any one of claims 1 to 5, characterized in that: The optical lens meets at least one of the following conditions: 0.45≤d 前 / TTL≤0.75, 0.025≤d2 / TTL≤0.095, 0.92≤(H / 2) / (F×tan(FOV / 2))≤0.99, 0.42≤F / TTL≤0.52, 1.8≤F / H≤2.5, 0.05≤BFL / TTL≤0.13, -0.007≤ 前 / ≤0.8， 0.8≤|ST-Fobj| / F≤1.9, 0.88≤DST / F≤1.45, 0.44≤DST / D1≤0.78, -0.5≤R7 / R8≤1, 1.25≥F1 / F≥1.1, -1.7≤F1 / F2≤-1.3, 0.9≤d 前 / d 后 ≤2.9, 0.05≤d3 / TTL≤0.15, 0.15≤d3 / F≤0.26, -0.7≤(R2-R3) / (R2+R3)≤6, -15mm≤1 / (1 / R3-1 / R4)≤-7mm, 60.14°≥arctan(1 / K(S4))≥35°, |SAG6 / SAG5|≤1, 0.6≤|R2 / F|≤1, 0.23≥d4 / TTL≥0.06, 1.3≤ 34 / ≤2， 0.3≤F3 / F4≤1.5, Wherein, F is the total effective focal length of the optical lens, H is the image height corresponding to the maximum field angle of the optical lens, FOV is the maximum field angle of the optical lens, BFL is the distance from the center of the second side surface of the fourth lens to the imaging surface of the optical lens on the optical axis, 前 is the combined optical power of all lenses located on the first side of the aperture, is the total focal power of the optical lens, |ST-Fobj| is the distance from the aperture to the first focal plane of the optical lens, DST is the full aperture of the aperture, D1 is the maximum aperture of the first side of the first lens, R8 is the radius of curvature of the second side of the fourth lens, R7 is the radius of curvature of the first side of the fourth lens, F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, d 后 is the distance from the aperture to the imaging surface of the optical lens on the optical axis, d3 is the center thickness of the second lens on the optical axis, R2 is the curvature radius of the second side surface of the first lens, R3 is the curvature radius of the first side surface of the second lens, R4 is the curvature radius of the second side surface of the second lens, arctan(1 / K(S4)) is the edge angle of the second side surface of the second lens at the maximum field angle of the optical lens, d4 is the air gap between the second lens and the third lens on the optical axis, 34 is the combined optical power of the third lens and the fourth lens, F3 is the effective focal length of the third lens, and F4 is the effective focal length of the fourth lens.

26. The optical lens according to any one of claims 1 to 5, characterized in that: The optical lens meets at least one of the following conditions: 0.54≤d 前 / TTL≤0.73, 0.03≤d2 / TTL≤0.09, 0.93≤(H / 2) / (F×tan(FOV / 2))≤0.97, 0.43≤F / TTL≤0.50, 1.92≤F / H≤2.37, 0.05≤BFL / TTL≤0.11, -0.006≤ 前 / ≤0.66， 0.93≤|ST-Fobj| / F≤1.65, 0.92≤DST / F≤1.25, 0.54≤DST / D1≤0.73, 0.84≤|R8 / F|≤4.92, -0.17≤R7 / R8≤0.77, 1.14≤F1 / F≤1.25, -1.70≤F1 / F2≤-1.41, 1.17≤d 前 / d 后 ≤2.69, 0.07≤d3 / TTL≤0.13, 0.18≤d3 / F≤0.26, -0.82≤(R2-R3) / (R2+R3)≤5.80, -12.06mm≤1 / (1 / R3-1 / R4)≤-8.67mm, 39.69°≤arctan(1 / K(S4))≤60.14°, 0.08≤|SAG6 / SAG5|≤0.74, 0.73≤|R2 / F|≤0.99, 0.08≤d4 / TTL≤0.23, 1.52≤ 34 / ≤1.75， 0.47≤F3 / F4≤1.37, Wherein, F is the total effective focal length of the optical lens, H is the image height corresponding to the maximum field angle of the optical lens, FOV is the maximum field angle of the optical lens, BFL is the distance from the center of the second side surface of the fourth lens to the imaging surface of the optical lens on the optical axis, 前 is the combined optical power of all lenses located on the first side of the aperture, is the total focal power of the optical lens, |ST-Fobj| is the distance from the aperture to the first focal plane of the optical lens, DST is the full aperture of the aperture, D1 is the maximum aperture of the first side of the first lens, R8 is the radius of curvature of the second side of the fourth lens, R7 is the radius of curvature of the first side of the fourth lens, F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, d 后 is the distance from the aperture to the imaging surface of the optical lens on the optical axis, d3 is the center thickness of the second lens on the optical axis, R2 is the curvature radius of the second side surface of the first lens, R3 is the curvature radius of the first side surface of the second lens, R4 is the curvature radius of the second side surface of the second lens, arctan(1 / K(S4)) is the edge angle of the second side surface of the second lens at the maximum field angle of the optical lens, d4 is the air gap between the second lens and the third lens on the optical axis, 34 is the combined optical power of the third lens and the fourth lens, F3 is the effective focal length of the third lens, and F4 is the effective focal length of the fourth lens.

27. An electronic device, characterized in that: It comprises an optical lens according to any one of claims 1 to 26 and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

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