Optical lenses and electronic equipment

Abstract

The present application discloses an optical lens and an electronic device. The optical lens includes 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 in sequence from the first side to the second side along the optical axis. The second side surface of the first lens is a convex surface, the first side surface of the second lens is a concave surface, the first side surface of the third lens is a convex surface, and the first side surface of the fourth lens is a convex surface. The air interval T34 between the third lens and the fourth lens on the optical axis and the distance TTL 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 satisfy 0<T34 / TTL≤0.5; the effective focal length F4 of the fourth lens and the combined effective focal length F13 of the first lens to the third lens satisfy 0.1<F4 / F13≤1.5; the air interval d2 between the first lens and the second lens on the optical axis and the distance TTL 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 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, with the development of autonomous driving, people have been increasingly demanding the clarity and uniformity of vehicle projection lenses in order to meet the needs of better human-vehicle interaction and decorative entertainment. However, the vehicle projection lenses in the prior art still have the following deficiencies: 1) The vehicle projection lenses in the prior art generally have low resolution and severe color fringing of the projected image; 2) The vehicle projection lenses in the prior art are generally large in size and require high installation space; 3) The light uniformity of the vehicle projection lenses in the prior art is low. Summary of the invention

[0003] 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 second side surface of the first lens is a convex surface, the first side surface of the second lens is a concave surface, the first side surface of the third lens is a convex surface, and the first side surface of the fourth lens is a convex surface. The air interval T34 between the third lens and the fourth lens on the optical axis and the distance TTL 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 satisfy: 0<T34 / TTL≤0.5; the effective focal length F4 of the fourth lens and the combined effective focal length F13 of the first lens to the third lens satisfy: 0.1<F4 / F13≤1.5; the air interval d2 between the first lens and the second lens on the optical axis and the distance TTL 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 satisfy: 0.01≤d2 / TTL≤0.1.

[0004] In one embodiment, the first side surface of the first lens is a convex surface or a flat surface.

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

[0006] In one embodiment, the second side surface of the third lens is a convex surface, a flat surface, or a concave surface.

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

[0008] In one embodiment, the optical lens satisfies at least one of the following: Dmax / TTL≤0.6, L / TTL>1, wherein Dmax is the maximum clear aperture of all lenses corresponding to the maximum field of view of the optical lens, 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, the optical lens also includes an aperture located on the first side of the first lens, and L is the distance from the aperture to the last optical surface of the optical lens on the optical axis.

[0009] In one embodiment, the optical lens satisfies at least one of the following: 0.08≤(d2+d4+d6) / TTL≤0.31, TTL / F13≤6, wherein d2 is the air spacing between the first lens and the second lens on the optical axis, d4 is the air spacing between the second lens and the third lens on the optical axis, the optical lens also includes a flat glass located between the third lens and the fourth lens, d6 is the air spacing between the third lens and the flat glass on the optical axis, F13 is the combined effective focal length of the first lens to the third 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.

[0010] In one embodiment, the optical lens satisfies at least one of the following: d8 / TTL≥0.08, d10 / TTL≤0.1, d6 / TTL≤0.2, wherein the optical lens also includes a flat glass located between the third lens and the fourth lens, d6 is the air gap between the third lens and the flat glass on the optical axis, d8 is the air gap between the flat glass and the fourth lens on the optical axis, d10 is the distance from the fourth lens to the last optical surface of the optical lens on the optical axis, 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.

[0011] In one embodiment, the optical lens satisfies: DST / TTL≤0.5, wherein the optical lens also includes an aperture located on the first side of the first lens, DST is the full aperture of the aperture, 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.

[0012] In one embodiment, the optical lens satisfies: R1 / TTL≥0.15, wherein R1 is the radius of curvature of the first side surface of the first 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.

[0013] In one embodiment, the optical lens satisfies: |F2 / F13|≤0.98, wherein F2 is the effective focal length of the second lens, and F13 is the combined effective focal length of the first lens to the third lens.

[0014] In one embodiment, the optical lens satisfies: (d5+d6) / TTL≥0.05, wherein d5 is the center thickness of the third lens on the optical axis, the optical lens also includes a flat glass located between the third lens and the fourth lens, d6 is the air gap between the third lens and the flat glass on the optical axis, 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.

[0015] In one embodiment, the optical lens satisfies at least one of the following: R1 / F13≥0.45, 0.55≤F1 / F13≤0.89, wherein R1 is the radius of curvature of the first side surface of the first lens, F13 is the combined effective focal length of the first lens to the third lens, and F1 is the effective focal length of the first lens.

[0016] In one embodiment, the optical lens satisfies at least one of the following: F3 / F13≤0.86, R5 / F13≤0.45, wherein F3 is the effective focal length of the third lens, F13 is the combined effective focal length of the first lens to the third lens, and R5 is the curvature radius of the first side surface of the third lens.

[0017] In one embodiment, the optical lens satisfies: |F1 / F12|≤0.55, wherein F1 is the effective focal length of the first lens, and F12 is the combined effective focal length of the first lens to the second lens.

[0018] In one embodiment, the optical lens satisfies at least one of the following: (R1 / D1) / (R2 / D2)<0, |R2 / D2|≤2, wherein R1 is the radius of curvature of the first side surface of the first lens, R2 is the radius of curvature of the second side surface of the first lens, D1 is the maximum light-clearing aperture of the first side surface of the first lens, and D2 is the maximum light-clearing aperture of the second side surface of the first lens.

[0019] In one embodiment, SAG4 / SAG3≥-0.2, |R4 / R5|≥1.1, wherein SAG4 is the sag corresponding to the second side surface of the second lens at the maximum field of view angle of the optical lens, SAG3 is the sag corresponding to the first side surface of the second lens at the maximum field of view angle of the optical lens, R4 is the curvature radius of the second side surface of the second lens, and R5 is the curvature radius of the first side surface of the third lens.

[0020] In one embodiment, 0<|SAG9 / SAG10|≤20, wherein SAG9 is the sag corresponding to the first side surface of the fourth lens at the maximum field of view angle of the optical lens, and SAG10 is the sag corresponding to the second side surface of the fourth lens at the maximum field of view angle of the optical lens.

[0021] In one embodiment, the second side surface of the fourth lens is a convex surface and satisfies -1≤R9 / R10≤0.63, wherein R9 is the curvature radius of the first side surface of the fourth lens, and R10 is the curvature radius of the second side surface of the fourth lens.

[0022] In one embodiment, the optical lens satisfies at least one of the following: 0.18≤T34 / TTL≤0.26, 0.4<F4 / F13≤1.2, 0.02≤d2 / TTL≤0.07, Dmax / TTL≤0.35, 1<L / TTL≤1.2, 0.11≤(d2+d4+d6) / TTL≤0.24, TTL / F13≤4, d8 / TTL≥0.09, d10 / TTL≤0.08, d6 / TTL≤0.15, DST / TTL≤0.25, 0.18 ≤R1 / TTL≤0.38, |F2 / F13|≤0.49, (d5+d6) / TTL≥0.07, R1 / F13≥0.55, 0.65≤F1 / F13≤0.82, F3 / F13≤0.66, R5 / F13≤0 .39, |F1 / F12|≤0.48, |R2 / D2|≤1.65, SAG4 / SAG3≥-0.15, |R4 / R5|≥2.3, 2.5≤|SAG9 / SAG10|≤18, -0.75≤R9 / R10<0.55, wherein T34 is the air gap between the third lens and the fourth lens on the optical axis, 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, F4 is the effective focal length of the fourth lens, F13 is the combined effective focal length of the first lens to the third lens, Dmax is the maximum clear aperture of all lenses corresponding to the maximum field of view of the optical lens, the optical lens further includes an aperture located on the first side of the first lens, L is the distance from the aperture to the last optical surface of the optical lens on the optical axis, d2 is the air gap between the first lens and the second lens on the optical axis, d4 is the air gap between the second lens and the third lens on the optical axis, the optical lens further includes a flat glass located between the third lens and the fourth lens, d6 is the air gap between the third lens and the flat glass on the optical axis, d8 is the air gap between the flat glass and the fourth lens on the optical axis, d10 is the distance from the fourth lens to the last optical surface of the optical lens on the optical axis, DST is the full aperture of the aperture, R1 is the The radius of curvature of the first side surface of a lens, F2 is the effective focal length of the second lens, d5 is the center thickness of the third lens on the optical axis, F1 is the effective focal length of the first lens, F3 is the effective focal length of the third lens, R5 is the radius of curvature of the first side surface of the third lens, F12 is the combined effective focal length of the first lens to the second lens, R2 is the radius of curvature of the second side surface of the first lens, D2 is the maximum aperture of the second side surface of the first lens, SAG4 is the sagittal height corresponding to the second side surface of the second lens at the maximum field of view of the optical lens, SAG3 is the sagittal height corresponding to the first side surface of the second lens at the maximum field of view of the optical lens, R4 is the radius of curvature of the second side surface of the second lens, SAG9 is the sagittal height corresponding to the first side surface of the fourth lens at the maximum field of view of the optical lens, SAG10 is the sagittal height corresponding to the second side surface of the fourth lens at the maximum field of view of the optical lens, R9 is the radius of curvature of the first side surface of the fourth lens, and R10 is the radius of curvature of the second side surface of the fourth lens. .

[0023] In one embodiment, the optical lens satisfies at least one of the following: 0.21≤T34 / TTL≤0.25, 0.57≤F4 / F13≤1.08, 0.03≤d2 / TTL≤0.07, 0.22≤Dmax / TTL≤0.31, 1.0029≤L / TTL≤1.0035, 0.14≤(d2+d4+d6) / TTL≤0.22, 2.81≤TTL / F13≤3.70, 0.11≤d8 / TTL≤0.14, 0.05≤d10 / TTL≤0.07, 0.08≤d6 / TTL≤0.14, 0.14≤DST / TTL≤0.23, 0.21≤R1 / TTL≤0.36, 0 .34≤|F2 / F13|≤0.47, 0.09≤(d5+d6) / TTL≤0.14, R1 / F13≥0.61, 0.68≤F1 / F 13≤0.79, 0.50≤F3 / F13≤0.64, 0.27≤R5 / F13≤0.35, |F1 / F12|≤0.45, -2.48 ≤(R1 / D1) / (R2 / D2)≤-0.83, 0.66≤|R2 / D2|≤1.55, -0.04≤SAG4 / SAG3≤0.26 , 2.51≤|R4 / R5|≤57.56, 2.73≤|SAG9 / SAG10|≤12.31, -0.6938≤R9 / R10≤0.4939, wherein T34 is the air gap between the third lens and the fourth lens on the optical axis, 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, F4 is the effective focal length of the fourth lens, F13 is the combined effective focal length of the first lens to the third lens, Dmax is the maximum aperture of all lenses corresponding to the maximum field of view of the optical lens, the optical lens further includes an aperture stop located on the first side of the first lens, L is the distance from the aperture stop to the last optical surface of the optical lens on the optical axis, d2 is the air gap between the first lens and the second lens on the optical axis, d4 is the air gap between the second lens and the third lens on the optical axis, the optical lens further includes a flat glass located between the third lens and the fourth lens, d6 is the air gap between the third lens and the flat glass on the optical axis, d8 is the air gap between the flat glass and the fourth lens on the optical axis, d10 is the distance from the fourth lens to the last optical surface of the optical lens on the optical axis, DST is the full aperture of the aperture stop, R1 is the radius of curvature of the first side surface of the first lens, F2 is the radius of curvature of the first side surface of the first lens, The effective focal length of the second lens, d5 is the center thickness of the third lens on the optical axis, F1 is the effective focal length of the first lens, F3 is the effective focal length of the third lens, R5 is the radius of curvature of the first side surface of the third lens, F12 is the combined effective focal length of the first lens to the second lens, R1 is the radius of curvature of the first side surface of the first lens, R2 is the radius of curvature of the second side surface of the first lens, D1 is the maximum aperture of the first side surface of the first lens, D2 is the maximum aperture of the second side surface of the first lens, SAG4 is the sagittal height corresponding to the second side surface of the second lens at the maximum field of view of the optical lens, SAG3 is the sagittal height corresponding to the first side surface of the second lens at the maximum field of view of the optical lens, R4 is the radius of curvature of the second side surface of the second lens, SAG9 is the sagittal height corresponding to the first side surface of the fourth lens at the maximum field of view of the optical lens, SAG10 is the sagittal height corresponding to the second side surface of the fourth lens at the maximum field of view of the optical lens, R9 is the radius of curvature of the first side surface of the fourth lens, and R10 is the radius of curvature of the second side surface of the fourth lens. .

[0024] 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.

[0025] The optical lens provided by the present application adopts four lenses, and the shape and focal length of each lens are reasonably set. The first lens, the third lens and the fourth lens have positive focal length, the second lens has negative focal length, the second side of the first lens is convex, the first side of the second lens is concave, the first side of the third lens is convex, and the first side of the fourth lens is convex, and 0<T34 / TTL≤0.5, 0.1<F4 / F13≤1.5 and 0.01≤d2 / TTL≤0.1 are satisfied. Reasonable control of the interval between the third lens and the fourth lens is helpful to increase the optical path, make the light uniform, control F4 within a certain range, and facilitate the fourth lens to collect large-angle light and reduce the exit angle of large-angle light at the edge, thereby improving the luminous flux of the system. In addition, appropriately increasing the distance between the first lens and the second lens is conducive to balancing aberrations and improving resolution. Therefore, the optical lens provided by the present application has at least one beneficial effect of miniaturization, small aperture, small CRA, high light flux, high resolution and high light uniformity. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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:

[0027] Figure 1 A schematic structural diagram of an optical lens according to Embodiment 1 of the present application is shown;

[0028] Figure 2 shows a spot diagram of the optical lens according to Example 1 of the present application;

[0029] Figure 3 A schematic structural diagram of an optical lens according to Embodiment 2 of the present application is shown;

[0030] Figure 4 shows a spot diagram of an optical lens according to Example 2 of the present application;

[0031] Figure 5 A schematic structural diagram of an optical lens according to Embodiment 3 of the present application is shown;

[0032] Figure 6 shows a spot diagram of an optical lens according to Example 3 of the present application;

[0033] Figure 7 A schematic structural diagram of an optical lens according to Embodiment 4 of the present application is shown;

[0034] Figure 8 shows a spot diagram of an optical lens according to Example 4 of the present application;

[0035] Fig. 9 A schematic structural diagram of an optical lens according to Embodiment 5 of the present application is shown;

[0036] Fig.10 shows a spot diagram of the optical lens according to Example 5 of the present application;

[0037] Fig.11 A schematic structural diagram of an optical lens according to Embodiment 6 of the present application is shown;

[0038] Fig.12 shows a spot diagram of the optical lens according to Example 6 of the present application;

[0039] Fig.13 A schematic structural diagram of an optical lens according to Embodiment 7 of the present application is shown;

[0040] Fig.14 shows a spot diagram of an optical lens according to Example 7 of the present application;

[0041] Fig.15 A schematic structural diagram of an optical lens according to Example 8 of the present application is shown;

[0042] Fig.16 shows a spot diagram of the optical lens according to Example 8 of the present application;

[0043] Fig.17 A schematic structural diagram of an optical lens according to Example 9 of the present application is shown;

[0044] Fig.18 The spot diagram of the optical lens according to Example 9 of the present application is shown. DETAILED DESCRIPTION

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] The features, principles and other aspects of the present application are described in detail below.

[0054] 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.

[0055] In an exemplary embodiment, the optical lens provided by 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, TTL is the distance on the optical axis from the center of the first side surface of the first lens to the last optical surface (i.e., the imaging surface) of the optical lens. For example, in the present application Figure 1 , Figure 3 , Figure 5 , Figure 7 , Fig. 9 , Fig.11 , Fig.13 , Fig.15 and Fig.17 For example, LED in the middle can represent the imaging surface, TTL is the distance from the center of the first side surface of the first lens to the LED on the optical axis, L is the distance from the aperture to the LED on the optical axis, and d10 is the distance from the fourth lens to the LED of the optical lens on the optical axis.

[0056] 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).

[0057] In an exemplary embodiment, the optical lens provided by the present application can be used as, for example, a projection lens or a laser radar transmitting end lens. 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, 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 (i.e., the image surface or the light source surface) on the optical axis. For example, in the present application Figure 1 , Figure 3 , Figure 5 , Figure 7 , Fig. 9 , Fig.11 , Fig.13 , Fig.15 and Fig.17 The middle LED can, for example, represent the image plane or the light source plane, TTL is the distance from the center of the first side surface of the first lens to the LED on the optical axis, L is the distance from the aperture to the LED on the optical axis, and d10 is the distance from the fourth lens to the LED of the optical lens on the optical axis.

[0058] In an exemplary embodiment, the first lens has positive optical power, and its first side is convex or flat, and the second side is convex. The first lens has positive optical power and has a converging effect on light, and can effectively converge the central light and edge light of each field of view to increase the system illumination. The first side (object side) of the first lens is a plane, which is conducive to further converging light and reducing the size of the lens. The first side (object side) of the first lens is a convex surface, which is conducive to collecting large-angle light and expanding the field of view of the lens.

[0059] In an exemplary embodiment, the second lens has negative optical power, and its first side surface is concave, and the second side surface is a plane. 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 concave plane type, which is conducive to lengthening the back focus. The first side surface (object side) of the second lens is a concave surface, which can cooperate with the first lens to collect and converge the edge field light. The second side surface (image side) is a plane, which can maintain the light divergence, and the rear optical system needs to re-converge the light, so it is conducive to lengthening the optical back focus.

[0060] In an exemplary embodiment, the second lens has negative optical power, and its first side surface is concave, and its 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 is beneficial to reduce the sensitivity of the system. The first side surface (object side) of the second lens is concave, which can cooperate with the first lens to collect and converge the edge field light, and the second side surface (image side) is concave, which can reduce the light deflection angle, which is beneficial to smooth the light trend and reduce sensitivity.

[0061] In an exemplary embodiment, the second lens has negative optical power, and its first side surface is concave and the second side surface is convex. The second lens has negative optical power and has a divergent effect on light, and can adjust the light deflection angle so that the divergent light can smoothly enter the rear. The second lens is a concave-convex surface type, which can cooperate with the first lens to collect and converge the edge field light. The second side surface (image side) is convex, which adjusts the light divergence angle, is conducive to smoothing the light trend and reducing the sensitivity of the rear optical system.

[0062] 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, further converges light, can effectively converge the center and edge light of each field of view, and increase the system illumination; the first side surface (object side) of the third lens is convex, which is conducive to converging light and increasing the system illumination.

[0063] In an exemplary embodiment, the third lens has positive optical power, its first side surface is convex, and its second side surface is flat. The third lens has positive optical power, and its first side surface (object side surface) is convex, which is conducive to converging large-angle light and reducing sensitivity; the second side surface (image side surface) of the third lens is flat, which is conducive to maintaining the light trend and lengthening the back focus.

[0064] In an exemplary embodiment, the third lens has positive optical power, a first side surface thereof is convex, and a second side surface thereof is concave. The third lens has positive optical power and has a converging effect on light, and a second side surface (image side surface) is concave, which is beneficial to reduce back focus and reduce the volume of the system.

[0065] 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, has the effect of converging and collimating light, the first side surface (object side surface) is convex, which is conducive to collecting light, and the second side surface (image side surface) is convex, which is conducive to adjusting the collimation angle of light and playing a role in collimating light.

[0066] In an exemplary embodiment, the fourth lens has positive optical power, and its first side surface is convex and its second side surface is concave. The fourth lens has positive optical power, has the effect of converging and collimating light, the first side surface (object side surface) is convex, which is conducive to collecting large-angle light, and the second side surface (image side surface) is concave, which is conducive to reducing the rear-end volume of the system.

[0067] In an exemplary embodiment, the first side surface and the second side surface of the first lens, the second lens, the third lens and the fourth lens are all aspherical mirror surfaces. Among them, the first lens, the second lens and the third lens are configured as aspherical lenses, and the curvatures of the aspherical surfaces at different positions are different, which is conducive to correcting system aberrations and field curvatures and improving the resolution of the optical system. The fourth lens is configured as an aspherical lens, which is conducive to collecting light, making the light more uniform, and improving the uniformity of light.

[0068] In an exemplary embodiment, the optical lens according to the present application may further include an aperture, which may be disposed on the first side (object side) of the first lens. The aperture is located before the first lens, which is conducive to restricting the light entering the optical system and reducing the front port diameter of the optical system. 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.

[0069] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0<T34 / TTL≤0.5, wherein T34 is the air interval between the third lens and the fourth lens on the optical axis, 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 0<T34 / TTL≤0.5 is conducive to homogenizing the light and improving the light uniformity of the system; if the value of T34 / TTL is lower than this range, the large-angle light does not pass through a sufficient optical path for homogenization, which will cause the light uniformity to decrease; if the value of T34 / TTL exceeds this range, the emitted large-angle light will be excessively dispersed, and the light uniformity will decrease. More specifically, T34 and TTL may further satisfy 0.18≤T34 / TTL≤0.26, which is conducive to better improving the light uniformity of the system. T34 and TTL may further satisfy 0.21≤T34 / TTL≤0.25.

[0070] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.1<F4 / F13≤1.5, wherein F4 is the effective focal length of the fourth lens, and F13 is the combined effective focal length of the first lens to the third lens. Satisfying 0.1<F4 / F13≤1.5 is conducive to the fourth lens collecting large-angle light and improving the luminous flux of the system; if the value of F4 / F13 is higher than this range, the fourth lens's ability to collect light is weakened, resulting in a decrease in the luminous flux entering the system. More specifically, F4 and F13 may further satisfy 0.4<F4 / F13≤1.2, which is conducive to better improving the luminous flux of the system. F4 and F13 may further satisfy 0.57≤F4 / F13≤1.08.

[0071] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.01≤d2 / TTL≤0.1, wherein 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, and d2 is the air interval between the first lens and the second lens on the optical axis. Satisfying 0.01≤d2 / TTL≤0.1 is conducive to balancing aberrations and improving the resolution of the lens. More specifically, TTL and d2 may further satisfy 0.02≤d2 / TTL≤0.07, which is conducive to further balancing aberrations and improving the resolution of the lens. TTL and d2 may further satisfy 0.03≤d2 / TTL≤0.07.

[0072] In an exemplary embodiment, the optical lens according to the present application may satisfy: Dmax / TTL≤0.6, wherein Dmax is the maximum clear aperture of all lenses corresponding to the maximum field of view of the optical lens, and TTL is the distance on the optical axis from the center of the first side surface of the first lens to the last optical surface of the optical lens. By controlling the ratio of the maximum clear aperture of the optical lens to TTL, the smaller the ratio, the more conducive to compressing the lens aperture, thereby achieving overall miniaturization. More specifically, Dmax and TTL may further satisfy Dmax / TTL≤0.35, which is conducive to better miniaturization. Dmax and TTL may further satisfy 0.22≤Dmax / TTL≤0.31.

[0073] In an exemplary embodiment, the optical lens according to the present application may further include an aperture located on the first side of the first lens, and may satisfy: L / TTL>1, wherein L is the distance from the aperture to the last optical surface of the optical lens on the optical axis, 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. The larger the ratio of L to TTL, the more favorable it is for the aperture to be placed in front, satisfying L / TTL>1, which is beneficial for the aperture to be placed in front and reducing the front port diameter of the system. More specifically, L and TTL may further satisfy 1<L / TTL≤1.29. L and TTL may further satisfy 1.0029≤L / TTL≤1.0035.

[0074] In an exemplary embodiment, the optical lens according to the present application may further include a flat glass located between the third lens and the fourth lens, and may satisfy: 0.08≤(d2+d4+d6) / TTL≤0.31, wherein d2 is the air interval between the first lens and the second lens on the optical axis, d4 is the air interval between the second lens and the third lens on the optical axis, d6 is the air interval between the third lens and the flat glass on the optical axis, F13 is the combined effective focal length of the first lens to the third 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 0.08≤(d2+d4+d6) / TTL≤0.31 and shortening the ratio of the sum of the air intervals between the first lens and the third lens and between the third lens and the flat glass to the total length TTL of the system is beneficial to improving the assembly yield. More specifically, d2, d4, d6 and TTL may further satisfy 0.11≤(d2+d4+d6) / TTL≤0.24, which is beneficial to better improving the assembly yield. d2, d4, d6 and TTL may further satisfy 0.14≤(d2+d4+d6) / TTL≤0.22.

[0075] In an exemplary embodiment, the optical lens according to the present application may satisfy: TTL / F13≤6, wherein 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, and F13 is the combined effective focal length of the first lens to the third lens. The smaller F13 is, the stronger the ability of the first lens to the third lens to converge light is, and satisfying TTL / F13≤6, making the ratio of TTL to F13 smaller, is more conducive to reducing the total length of the system and realizing system miniaturization. More specifically, TTL and F13 may further satisfy TTL / F13≤4, which is conducive to better realizing system miniaturization. TTL and F13 may further satisfy 2.81≤TTL / F13≤3.70.

[0076] In an exemplary embodiment, the optical lens according to the present application may further include a flat glass between the third lens and the fourth lens, and may satisfy: d8 / TTL≥0.08, wherein d8 is the air spacing between the flat glass and the fourth lens on the optical axis, 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. To satisfy d8 / TTL≥0.08, the ratio of the air spacing between the flat glass and the fourth lens to TTL is controlled. The larger the ratio, the farther the distance between the flat glass and the fourth lens is, which is more conducive to enhancing the light control ability and more uniform light distribution, thereby improving the system light uniformity. More specifically, d8 and TTL may further satisfy d8 / TTL≥0.09, which is conducive to better achieving light uniformity. d8 and TTL may further satisfy 0.11≤d8 / TTL≤0.14.

[0077] In an exemplary embodiment, the optical lens according to the present application may satisfy: d10 / TTL≤0.1, wherein d10 is the distance from the fourth lens to the last optical surface of the optical lens on the optical axis, 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 d10 / TTL≤0.1 can make the distance between the fourth lens and the last optical surface (for example, the imaging surface or the light source surface) shorter, which is more conducive to collecting light from the edge field of view and improving the luminous flux of the system. More specifically, d10 and TTL may further satisfy d10 / TTL≤0.08, which is conducive to better improving the luminous flux of the system. d10 and TTL may further satisfy 0.05≤d10 / TTL≤0.07.

[0078] In an exemplary embodiment, the optical lens according to the present application may further include a flat glass between the third lens and the fourth lens, and may satisfy: d6 / TTL≤0.2, wherein d6 is the air interval between the third lens and the flat glass on the optical axis, 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. When d6 / TTL≤0.2 is satisfied, the smaller the ratio of d6 to TTL, the more conducive it is to shorten the back focus and reduce the total length of the system. More specifically, d6 and TTL may further satisfy d6 / TTL≤0.15, which is conducive to better miniaturization. d6 and TTL may further satisfy 0.08≤d6 / TTL≤0.14.

[0079] In an exemplary embodiment, the optical lens according to the present application may further include an aperture located on the first side of the first lens, and may satisfy: DST / TTL≤0.5, wherein DST is the full aperture of the aperture, 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 DST / TTL≤0.5 ensures that the aperture is small, which is conducive to reducing the overall aperture and realizing system miniaturization. More specifically, DST and TTL may further satisfy DST / TTL≤0.25, which is conducive to better realizing system miniaturization. DST and TTL may further satisfy 0.14≤DST / TTL≤0.23.

[0080] In an exemplary embodiment, the optical lens according to the present application may satisfy: R1 / TTL≥0.15, wherein R1 is the radius of curvature of the first side of the first lens, and TTL is the distance from the center of the first side of the first lens to the last optical surface of the optical lens on the optical axis. Meeting R1 / TTL≥0.15 is conducive to the first side of the first lens collecting light with a large field of view and realizing the characteristics of a large field of view, otherwise the first side of the first lens will reduce the ability to collect light with a large field of view. More specifically, R1 and TTL may further satisfy 0.18≤R1 / TTL≤0.38, which is conducive to better realizing the characteristics of a large field of view. R1 and TTL may further satisfy 0.21≤R1 / TTL≤0.36.

[0081] In an exemplary embodiment, the optical lens according to the present application may satisfy: |F2 / F13|≤0.98, wherein F2 is the effective focal length of the second lens, and F13 is the combined effective focal length of the first lens to the third lens. When |F2 / F13|≤0.98 is satisfied, the smaller the ratio of F2 to F13, the smaller the focal length of the second lens, which is beneficial to correct aberrations and improve the resolution of the system. More specifically, F2 and F13 may further satisfy |F2 / F13|≤0.49, which is beneficial to better improve the resolution. F2 and F13 may further satisfy 0.34≤|F2 / F13|≤0.47.

[0082] In an exemplary embodiment, the optical lens according to the present application may further include a flat glass located between the third lens and the fourth lens, and may satisfy: (d5+d6) / TTL≥0.05, wherein d5 is the center thickness of the third lens on the optical axis, d6 is the air gap between the third lens and the flat glass on the optical axis, 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. When (d5+d6) / TTL≥0.05 is satisfied, the greater the thickness of the third lens and the air gap between the third lens and the flat glass, the smoother the transition of light and the improved relative illumination of the system. More specifically, d5, d6 and TTL may further satisfy (d5+d6) / TTL≥0.07, which is beneficial to better improve the relative illumination of the system. d5, d6 and TTL may further satisfy 0.09≤(d5+d6) / TTL≤0.14.

[0083] In an exemplary embodiment, the optical lens according to the present application may satisfy: R1 / F13≥0.45, wherein R1 is the radius of curvature of the first side of the first lens, and F13 is the combined effective focal length of the first lens to the third lens. Satisfying R1 / F13≥0.45, the shape of the first side of the first lens is reasonably set, so that the front end volume of the optical lens is small, which is conducive to miniaturization of the system. More specifically, R1 and F13 may further satisfy R1 / F13≥0.55, which is conducive to better miniaturization. R1 and F13 may further satisfy R1 / F13≥0.61.

[0084] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.55≤F1 / F13≤0.89, wherein F13 is the combined effective focal length of the first lens to the third lens, and F1 is the effective focal length of the first lens. The first lens has a positive focal power, which is conducive to collecting the central field of view and the edge field of view light and smoothly transitioning the light to the rear, and satisfies 0.55≤F1 / F13≤0.89. Reasonable setting of the focal length of the first lens is conducive to improving the system resolution. More specifically, F1 and F13 may further satisfy 0.65≤F1 / F13≤0.82, which is conducive to better improving the system resolution. F1 and F13 may further satisfy 0.68≤F1 / F13≤0.79.

[0085] In an exemplary embodiment, the optical lens according to the present application may satisfy: F3 / F13≤0.86, wherein F3 is the effective focal length of the third lens, and F13 is the combined effective focal length of the first lens to the third lens. The third lens has positive focal power, and the smaller its focal length is, the more conducive it is to converge light and reduce CRA, satisfying F3 / F13≤0.86, and controlling the focal length of the third lens can achieve a small CRA (chief ray angle). More specifically, F3 and F13 may further satisfy F3 / F13≤0.66, which is conducive to better achieving a small CRA. F3 and F13 may further satisfy 0.50≤F3 / F13≤0.64.

[0086] In an exemplary embodiment, the optical lens according to the present application may satisfy: R5 / F13≤0.45, wherein R5 is the radius of curvature of the first side of the third lens, and F13 is the combined effective focal length of the first lens to the third lens. When R5 / F13≤0.45 is satisfied, the smaller the ratio of the radius of curvature of the first side of the third lens to F13 is, the stronger the ability to turn light is, which is conducive to smoothing the angle of light passing through the second lens and reducing CRA. More specifically, R5 and F13 may further satisfy R5 / F13≤0.39, which is conducive to better achieving a small CRA. R5 and F13 may further satisfy 0.27≤R5 / F13≤0.35.

[0087] In an exemplary embodiment, the optical lens according to the present application may satisfy: |F1 / F12|≤0.55, wherein F1 is the effective focal length of the first lens, and F12 is the combined effective focal length of the first lens to the second lens. When |F1 / F12|≤0.55 is satisfied, the smaller the ratio of the focal length of the first lens to the combined focal length of the first lens to the second lens is, the smoother the transition of light is, which is beneficial to improving the system resolution. More specifically, F1 and F12 may further satisfy |F1 / F12|≤0.48, which is beneficial to better improving the system resolution. F1 and F12 may further satisfy |F1 / F12|≤0.45.

[0088] In an exemplary embodiment, the optical lens according to the present application may satisfy: (R1 / D1) / (R2 / D2)<0, wherein R1 is the radius of curvature of the first side of the first lens, R2 is the radius of curvature of the second side of the first lens, D1 is the maximum aperture of the first side of the first lens, and D2 is the maximum aperture of the second side of the first lens. Satisfying (R1 / D1) / (R2 / D2)<0, the first lens has positive focal length, and its first side and second side are both convex surfaces, which have the function of converging light, and satisfying the above conditional formula, controlling the curvature of the two sides to be greatly different, and D1 and D2 are close, which helps to better achieve light convergence and light suppression. More specifically, R1, D1, R2 and D2 may further satisfy -2.48≤(R1 / D1) / (R2 / D2)≤-0.83.

[0089] In an exemplary embodiment, the optical lens according to the present application may satisfy: |R2 / D2|≤2, wherein R2 is the radius of curvature of the second side of the first lens, and D2 is the maximum aperture of the second side of the first lens. When |R2 / D2|≤2 is satisfied, the smaller the ratio of the radius of curvature of the second side of the first lens to the maximum aperture, the more conducive it is to reduce the height of the light entering the second lens and achieve a small aperture. More specifically, R2 and D2 may further satisfy |R2 / D2|≤1.65, which is conducive to better achieving a small aperture. R2 and D2 may further satisfy 0.66≤|R2 / D2|≤1.55.

[0090] In an exemplary embodiment, the optical lens according to the present application may satisfy: SAG4 / SAG3≥-0.2, wherein SAG4 is the sagittal height corresponding to the second side of the second lens at the maximum field of view of the optical lens, and SAG3 is the sagittal height corresponding to the first side of the second lens at the maximum field of view of the optical lens. When SAG4 / SAG3≥-0.2 is satisfied, the greater the sagittal height of the second side of the second lens, the more conducive it is to adjusting the marginal light angle, balancing aberrations, and improving resolution. More specifically, SAG4 and SAG3 may further satisfy SAG4 / SAG3≥-0.15, which is conducive to better improving resolution. SAG4 and SAG3 may further satisfy -0.04≤SAG4 / SAG3≤0.26.

[0091] In an exemplary embodiment, the optical lens according to the present application may satisfy: |R4 / R5|≥1.1, wherein R4 is the radius of curvature of the second side of the second lens, and R5 is the radius of curvature of the first side of the third lens. Satisfying |R4 / R5|≥1.1 can reduce the curvature of the first side of the third lens, which is beneficial to converge the light after divergence of the second lens, reduce the edge chief ray angle, and reduce CRA. More specifically, R4 and R5 may further satisfy |R4 / R5|≥2.3, which is beneficial to better achieve a small CRA. R4 and R5 may further satisfy 2.51≤|R4 / R5|≤57.56.

[0092] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0<|SAG9 / SAG10|≤20, wherein SAG9 is the sag corresponding to the first side of the fourth lens at the maximum field of view angle of the optical lens, and SAG10 is the sag corresponding to the second side of the fourth lens at the maximum field of view angle of the optical lens. Satisfying 0<|SAG9 / SAG10|≤20, the greater the sag ratio between the first side and the second side of the fourth lens, the greater the difference in sag between the two sides, which is conducive to a large deflection of large-angle light, so that the angle of the light after passing through the fourth lens tends to be gentle, which is conducive to improving the light uniformity of the system. More specifically, SAG9 and SAG10 may further satisfy 2.5≤|SAG9 / SAG10|≤18, which is conducive to better achieving light uniformity. SAG9 and SAG10 may further satisfy 2.73≤|SAG9 / SAG10|≤12.31.

[0093] In an exemplary embodiment, the second side surface of the fourth lens of the optical lens according to the present application may be a convex surface and satisfy: -1≤R9 / R10≤0.63, wherein R9 is the radius of curvature of the first side surface of the fourth lens, and R10 is the radius of curvature of the second side surface of the fourth lens. Satisfying -1≤R9 / R10≤0.63 is conducive to reducing the exit angle of the large-angle light entering the fourth lens when it is emitted, making the exit light smoother, which is conducive to improving the light uniformity of the system. If the ratio of R9 to R10 exceeds the upper limit of this range, the deflection ability of R9 for light is weakened, which is not conducive to improving the imaging uniformity of the system; if the ratio of R9 to R10 is lower than the lower limit of this range, the deflection ability of R9 for light is too strong, so that the light cannot tend to be emitted in parallel, which will reduce the imaging uniformity of the system. More specifically, R9 and R10 can further satisfy -0.75≤R9 / R10<0.55, which is conducive to better achieving light uniformity. R9 and R10 may further satisfy -0.6938≤R9 / R10≤0.4939.

[0094] In an exemplary embodiment, the optical lens according to the present application may satisfy: |SAG6 / SAG5|≥0.05, wherein SAG6 is the sagittal height corresponding to the second side of the third lens at the maximum field of view angle of the optical lens, and SAG5 is the sagittal height corresponding to the first side of the third lens at the maximum field of view angle of the optical lens. Satisfying |SAG6 / SAG5|≥0.05 makes the difference between the sagittal heights of the first side and the second side of the third lens large, which is beneficial for the third lens to collect light, so that the light smoothly transitions to the rear, and effectively reduces the system aberration and improves the system imaging quality. More specifically, SAG5 and SAG6 may further satisfy |SAG6 / SAG5|≥0.15, and further satisfy 0.13≤|SAG6 / SAG5|≤0.32.

[0095] 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 can use aspherical lenses. Exemplarily, the first lens to the fourth lens of the present application may all be aspherical 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.

[0096] 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.

[0097] According to the above-mentioned embodiment of the present application, the optical lens can have at least one beneficial effect of miniaturization, small aperture, small CRA, high light flux, high resolution and high light uniformity through the reasonable setting of parameters such as lens shape and optical focal length.

[0098] 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. Example 1

[0099] 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.

[0100] 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.

[0101] 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 concave-convex lens with negative power, whose first side surface S3 is concave, and whose second side surface S4 is convex. 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-convex lens with positive power, whose first side surface S9 is convex, and whose second side surface S10 is convex.

[0102] The optical lens may further include a stop STO, and the stop STO may be disposed on a first side of the first lens L1.

[0103] The optical lens may further include a flat glass FILM disposed between the third lens L3 and the fourth lens L4, wherein the flat glass FILM has a first side surface S7 and a second side surface S8.

[0104] 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.

[0105] Table 1

[0106]

[0107] In Example 1, the first side surface and the second side surface of the first lens L1, the second lens L2, the third lens L3 and the fourth lens L4 are all aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0108] (1)

[0109] 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.

[0110] Table 2

[0111]

[0112] Figure 2 The spot diagram of the optical lens of Example 1 is shown. Figure 2 It can be seen that the colors of the center and edge of the light spot of the optical lens provided in Example 1 are relatively consistent, and the spots are relatively concentrated, without obvious spot dispersion, and the uniformity is good. Example 2

[0113] 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.

[0114] 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.

[0115] 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 concave-convex lens with negative power, whose first side surface S3 is concave and whose second side surface S4 is convex. 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-concave lens with positive power, whose first side surface S9 is convex and whose second side surface S10 is concave.

[0116] The optical lens may further include a stop STO, and the stop STO may be disposed on a first side of the first lens L1.

[0117] The optical lens may further include a flat glass FILM disposed between the third lens L3 and the fourth lens L4, wherein the flat glass FILM has a first side surface S7 and a second side surface S8.

[0118] 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.

[0119] Table 3

[0120]

[0121] Table 4

[0122]

[0123] Figure 4 The spot diagram of the optical lens of Example 2 is shown. Figure 4 It can be seen that the colors of the center and edge of the light spot of the optical lens provided in Example 2 are relatively consistent, and the spots are relatively concentrated, without obvious spot dispersion, and the uniformity is good. Example 3

[0124] 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.

[0125] 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.

[0126] 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 concave-planar lens with negative power, whose first side surface S3 is concave and whose second side surface S4 is flat. 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-convex lens with positive power, whose first side surface S9 is convex and whose second side surface S10 is convex.

[0127] The optical lens may further include a stop STO, and the stop STO may be disposed on a first side of the first lens L1.

[0128] The optical lens may further include a flat glass FILM disposed between the third lens L3 and the fourth lens L4, wherein the flat glass FILM has a first side surface S7 and a second side surface S8.

[0129] 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.

[0130] Table 5

[0131]

[0132] Table 6

[0133]

[0134] Figure 6 The spot diagram of the optical lens of Example 3 is shown. Figure 6 It can be seen that the colors of the center and edge of the light spot of the optical lens provided in Example 3 are relatively consistent, and the spots are relatively concentrated, without obvious spot dispersion, and the uniformity is good. Example 4

[0135] 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.

[0136] 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.

[0137] 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 concave-convex lens with negative power, whose first side surface S3 is concave, and whose second side surface S4 is convex. 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-convex lens with positive power, whose first side surface S9 is convex, and whose second side surface S10 is convex.

[0138] The optical lens may further include a stop STO, and the stop STO may be disposed on a first side of the first lens L1.

[0139] The optical lens may further include a flat glass FILM disposed between the third lens L3 and the fourth lens L4, wherein the flat glass FILM has a first side surface S7 and a second side surface S8.

[0140] 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.

[0141] Table 7

[0142]

[0143] Table 8

[0144]

[0145] Figure 8 The spot diagram of the optical lens of Example 4 is shown. Figure 8 It can be seen that the colors of the center and edge of the light spot of the optical lens provided in Example 4 are relatively consistent, and the spots are relatively concentrated, without obvious spot dispersion, and the uniformity is good. Example 5

[0146] 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.

[0147] 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.

[0148] 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-convex lens with negative power, whose first side surface S3 is concave and whose second side surface S4 is convex. The third lens L3 is a convex-concave lens with positive power, whose first side surface S5 is convex and whose second side surface S6 is concave. The fourth lens L4 is a convex-convex lens with positive power, whose first side surface S9 is convex and whose second side surface S10 is convex.

[0149] The optical lens may further include a stop STO, and the stop STO may be disposed on a first side of the first lens L1.

[0150] The optical lens may further include a flat glass FILM disposed between the third lens L3 and the fourth lens L4, wherein the flat glass FILM has a first side surface S7 and a second side surface S8.

[0151] 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.

[0152] Table 9

[0153]

[0154] Table 10

[0155]

[0156] Fig.10 The spot diagram of the optical lens of Example 5 is shown. Fig.10 It can be seen that the colors of the center and edge of the light spot of the optical lens provided in Example 5 are relatively consistent, and the spots are relatively concentrated, without obvious spot dispersion, and the uniformity is good. Example 6

[0157] 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.

[0158] 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.

[0159] The first lens L1 is a plano-convex lens with positive power, whose first side surface S1 is a plane and whose second side surface S2 is a convex surface. The second lens L2 is a concave-concave lens with negative power, whose first side surface S3 is a concave surface and whose second side surface S4 is a concave surface. The third lens L3 is a convex-concave lens with positive power, whose first side surface S5 is a convex surface and whose second side surface S6 is a concave surface. The fourth lens L4 is a convex-convex lens with positive power, whose first side surface S9 is a convex surface and whose second side surface S10 is a convex surface.

[0160] The optical lens may further include a stop STO, and the stop STO may be disposed on a first side of the first lens L1.

[0161] The optical lens may further include a flat glass FILM disposed between the third lens L3 and the fourth lens L4, wherein the flat glass FILM has a first side surface S7 and a second side surface S8.

[0162] 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.

[0163] Table 11

[0164]

[0165] Table 12

[0166]

[0167] Fig.12 The spot diagram of the optical lens of Example 6 is shown. Fig.12 It can be seen that the colors of the center and edge of the light spot of the optical lens provided in Example 6 are relatively consistent, and the spots are relatively concentrated, without obvious spot dispersion, and the uniformity is good. Example 7

[0168] 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.

[0169] 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.

[0170] The first lens L1 is a plano-convex lens with positive power, whose first side surface S1 is a plane and whose second side surface S2 is a convex surface. The second lens L2 is a concave-planar lens with negative power, whose first side surface S3 is a concave surface and whose second side surface S4 is a plane. The third lens L3 is a convex-planar lens with positive power, whose first side surface S5 is a convex surface and whose second side surface S6 is a plane. The fourth lens L4 is a convex-convex lens with positive power, whose first side surface S9 is a convex surface and whose second side surface S10 is a convex surface.

[0171] The optical lens may further include a stop STO, and the stop STO may be disposed on a first side of the first lens L1.

[0172] The optical lens may further include a flat glass FILM disposed between the third lens L3 and the fourth lens L4, wherein the flat glass FILM has a first side surface S7 and a second side surface S8.

[0173] 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.

[0174] Table 13

[0175]

[0176] Table 14

[0177]

[0178] Fig.14 The spot diagram of the optical lens of Example 7 is shown. Fig.14 It can be seen that the colors of the center and edge of the light spot of the optical lens provided in Example 7 are relatively consistent, and the spots are relatively concentrated, without obvious spot dispersion, and the uniformity is good. Example 8

[0179] 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.

[0180] 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.

[0181] 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 concave-concave lens with negative 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 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 power, whose first side surface S9 is convex, and whose second side surface S10 is convex.

[0182] The optical lens may further include a stop STO, and the stop STO may be disposed on a first side of the first lens L1.

[0183] The optical lens may further include a flat glass FILM disposed between the third lens L3 and the fourth lens L4, wherein the flat glass FILM has a first side surface S7 and a second side surface S8.

[0184] 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.

[0185] Table 15

[0186]

[0187] Table 16

[0188]

[0189] Fig.16 The spot diagram of the optical lens of Example 8 is shown. Fig.16 It can be seen that the colors of the center and edge of the light spot of the optical lens given in Example 8 are relatively consistent, and the spots are relatively concentrated, without obvious spot dispersion, and the uniformity is good. Example 9

[0190] 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.

[0191] 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.

[0192] 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 S9 is convex and whose second side surface S10 is concave.

[0193] The optical lens may further include a stop STO, and the stop STO may be disposed on a first side of the first lens L1.

[0194] The optical lens may further include a flat glass FILM disposed between the third lens L3 and the fourth lens L4, wherein the flat glass FILM has a first side surface S7 and a second side surface S8.

[0195] 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.

[0196] Table 17

[0197]

[0198] Table 18

[0199]

[0200] Fig.18 The spot diagram of the optical lens of Example 9 is shown. Fig.18 It can be seen that the colors of the center and edge of the light spot of the optical lens provided in Example 9 are relatively consistent, and the spots are relatively concentrated, without obvious spot dispersion, and the uniformity is good.

[0201] In summary, Examples 1 to 9 respectively satisfy the relationships shown in Table 19-1 and Table 19-2 below. In Table 19-1 and Table 19-2, the units of TTL, L, T34, DST, DMAX, F1~F4, F12, F13, D1, D2, D5, SAG3~SAG6, SAG9 and SAG10 are millimeters (mm), and the unit of FOV is degrees (°).

[0202] Table 19-1

[0203]

[0204] Table 19-2

[0205]

[0206] 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, Figure 1 , Figure 3 , Figure 5 , Figure 7 , Fig. 9 , Fig.11 , Fig.13 , Fig.15 and Fig.17 The middle LED 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 S10 to S1 and is finally projected to the first side, for example, to form an image or illuminate an area on the first side.

[0207] Exemplarily, the optical lens provided in the present application can also be used as, for example, a semi-dynamic module projection lens, and its application optical path is as follows: Figure 1 , Figure 3 , Figure 5 , Figure 7 , Fig. 9 , Fig.11 , Fig.13 , Fig.15 and Fig.17 The middle LED, for example, may represent an image plane or a light source plane, which is used to provide an image or light source LED to emit light, which is projected onto the flat glass FILM through the fourth lens L4. The light starts from the flat glass FILM and reaches the third lens L3. After passing through the second lens L2, the first lens L1 and the aperture STO in sequence, the maximum field of view FOV projected onto the imaging surface IMA is 38°~41°, and the aperture number FNO is 2.2~2.4.

[0208] It should be understood that the optical lens provided in the present application can also 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 and Fig.17 The middle LED may be an imaging surface, for example. Light from an object passes through the surfaces S1 to S10 in sequence and is finally imaged on the imaging surface disposed on the second side, wherein an image sensor chip is disposed on the imaging surface.

[0209] 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.

[0210] 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 second side surface of the first lens is convex; a second lens having negative optical power, wherein the first side surface of the second lens is concave; a third lens element having positive optical power, wherein the first side surface of the third lens element is convex; and a fourth lens element having positive power, wherein the first side surface of the fourth lens element is convex; The air interval T34 between the third lens and the fourth lens on the optical axis and the distance TTL 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 satisfy: 0<T34 / TTL≤0.5; The effective focal length F4 of the fourth lens and the combined effective focal length F13 of the first lens to the third lens satisfy: 0.1<F4 / F13≤1.5; The air interval d2 between the first lens and the second lens on the optical axis and the distance TTL 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 satisfy: 0.01≤d2 / TTL≤0.1; 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 first lens is a convex surface or a flat surface.

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

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

6. 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: Dmax / TTL≤0.6, L / TTL>1, Wherein, Dmax is the maximum clear aperture of all lenses corresponding to the maximum field of view angle of the optical lens, 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, the optical lens also includes an aperture located on the first side of the first lens, and L is the distance from the aperture to the last optical surface of the optical lens on the optical axis.

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: 0.08≤(d2+d4+d6) / TTL≤0.31, TTL / F13≤6, Wherein, d2 is the air gap between the first lens and the second lens on the optical axis, d4 is the air gap between the second lens and the third lens on the optical axis, the optical lens further comprises a flat glass between the third lens and the fourth lens, d6 is the air gap between the third lens and the flat glass on the optical axis, F13 is the combined effective focal length of the first lens to the third 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.

8. 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: d8 / TTL≥0.08, d10 / TTL≤0.1, d6 / TTL≤0.2, Wherein, the optical lens also includes a flat glass located between the third lens and the fourth lens, d6 is the air gap between the third lens and the flat glass on the optical axis, d8 is the air gap between the flat glass and the fourth lens on the optical axis, d10 is the distance from the fourth lens to the last optical surface of the optical lens on the optical axis, 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.

9. The optical lens according to any one of claims 1 to 5, characterized in that: The optical lens satisfies: DST / TTL≤0.5, wherein the optical lens further includes an aperture located on the first side of the first lens, DST is the full aperture of the aperture, 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.

10. The optical lens according to any one of claims 1 to 5, characterized in that: The optical lens satisfies: R1 / TTL≥0.15, wherein R1 is the radius of curvature of the first side surface of the first 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.

11. The optical lens according to any one of claims 1 to 5, characterized in that: The optical lens satisfies: |F2 / F13|≤0.98, wherein F2 is the effective focal length of the second lens, and F13 is the combined effective focal length of the first lens to the third lens.

12. The optical lens according to any one of claims 1 to 5, characterized in that: The optical lens satisfies: (d5+d6) / TTL≥0.05, wherein d5 is the center thickness of the third lens on the optical axis, the optical lens further comprises a flat glass between the third lens and the fourth lens, d6 is the air gap between the third lens and the flat glass on the optical axis, 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.

13. 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: R1 / F13≥0.45, 0.55≤F1 / F13≤0.89, Wherein, R1 is the curvature radius of the first side surface of the first lens, F13 is the combined effective focal length of the first lens to the third lens, and F1 is the effective focal length of the first lens.

14. 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: F3 / F13≤0.86, R5 / F13≤0.45, Wherein, F3 is the effective focal length of the third lens, F13 is the combined effective focal length of the first lens to the third lens, and R5 is the curvature radius of the first side surface of the third lens.

15. The optical lens according to any one of claims 1 to 5, characterized in that: The optical lens satisfies: |F1 / F12|≤0.55, wherein F1 is the effective focal length of the first lens, and F12 is the combined effective focal length of the first lens to the second lens.

16. 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: (R1 / D1) / (R2 / D2)<0, |R2 / D2|≤2, Among them, R1 is the curvature radius of the first side surface of the first lens, R2 is the curvature radius of the second side surface of the first lens, D1 is the maximum light-clearing aperture of the first side surface of the first lens, and D2 is the maximum light-clearing aperture of the second side surface of the first lens.

17. The optical lens according to any one of claims 1 to 5, characterized in that: SAG4 / SAG3≥-0.2, |R4 / R5|≥1.1, Among them, SAG4 is the sag corresponding to the second side of the second lens at the maximum field of view angle of the optical lens, SAG3 is the sag corresponding to the first side of the second lens at the maximum field of view angle of the optical lens, R4 is the curvature radius of the second side of the second lens, and R5 is the curvature radius of the first side of the third lens.

18. The optical lens according to any one of claims 1 to 5, characterized in that: 0<|SAG9 / SAG10|≤20, wherein SAG9 is the sag corresponding to the first side surface of the fourth lens at the maximum field of view angle of the optical lens, and SAG10 is the sag corresponding to the second side surface of the fourth lens at the maximum field of view angle of the optical lens.

19. The optical lens according to any one of claims 1 to 5, characterized in that: The second side surface of the fourth lens is a convex surface and satisfies -1≤R9 / R10≤0.63, wherein, R9 is the curvature radius of the first side surface of the fourth lens, and R10 is the curvature radius of the second side surface of the fourth lens.

20. 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: 0.21≤T34 / TTL≤0.25, 0.57≤F4 / F13≤1.08, 0.03≤d2 / TTL≤0.07, 0.22≤Dmax / TTL≤0.31, 1.0029≤L / TTL≤1.0035, 0.14≤(d2+d4+d6) / TTL≤0.22, 2 .81≤TTL / F13≤3.70, 0.11≤d8 / TTL≤0.14, 0.05≤d10 / TTL≤0.07, 0.08≤d6 / TTL≤0.14, 0.14≤DST / TTL≤0.23, 0.21≤R1 / TTL≤0.36, 0.34≤|F2 / F13|≤ 0.47,0.09≤(d5+d6) / TTL≤0.14,R1 / F13≥0.61,0.68≤F1 / F13≤0.79,0.5 0≤F3 / F13≤0.64, 0.27≤R5 / F13≤0.35, |F1 / F12|≤0.45, -2.48≤(R1 / D1) / (R2 / D2)≤-0.83, 0.66≤|R2 / D2|≤1.55, -0.04≤SAG4 / SAG3≤0.26, 2.51≤|R4 / R5|≤57.56, 2.73≤|SAG9 / SAG10|≤12.31, -0.6938≤R9 / R10≤0.4939, Wherein, T34 is the air interval between the third lens and the fourth lens on the optical axis, 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, F4 is the effective focal length of the fourth lens, F13 is the combined effective focal length of the first lens to the third lens, Dmax is the maximum clear aperture of all lenses corresponding to the maximum field of view of the optical lens, the optical lens further includes an aperture located on the first side of the first lens, L is the distance from the aperture to the last optical surface of the optical lens on the optical axis, d2 is the air interval between the first lens and the second lens on the optical axis, d4 is the air interval between the second lens and the third lens on the optical axis, the optical lens further includes a flat glass located between the third lens and the fourth lens, d6 is the air interval between the third lens and the flat glass on the optical axis, d8 is the air interval between the flat glass and the fourth lens on the optical axis, d10 is the distance from the fourth lens to the last optical surface of the optical lens on the optical axis, DST is the full aperture of the aperture, and R1 is the first side surface of the first lens The curvature radius of the first lens is F1, the effective focal length of the first lens is F2, the central thickness of the third lens on the optical axis is d5, the effective focal length of the first lens is F1, the effective focal length of the third lens is F3, the curvature radius of the first side surface of the third lens is R5, the combined effective focal length of the first lens to the second lens is F12, R1 is the curvature radius of the first side surface of the first lens, R2 is the curvature radius of the second side surface of the first lens, D1 is the maximum clear aperture of the first side surface of the first lens, D2 is the maximum clear aperture of the second side surface of the first lens, SAG4 SAG is the sag corresponding to the second side of the second lens at the maximum field of view angle of the optical lens, SAG3 is the sag corresponding to the first side of the second lens at the maximum field of view angle of the optical lens, R4 is the radius of curvature of the second side of the second lens, SAG9 is the sag corresponding to the first side of the fourth lens at the maximum field of view angle of the optical lens, SAG10 is the sag corresponding to the second side of the fourth lens at the maximum field of view angle of the optical lens, R9 is the radius of curvature of the first side of the fourth lens, and R10 is the radius of curvature of the second side of the fourth lens.

21. An electronic device, characterized in that: The invention comprises an optical lens according to any one of claims 1 to 20 and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

Images