Optical lenses and electronic equipment

Abstract

The present application discloses an optical lens and an electronic device, wherein the optical lens comprises, in order from the first side to the second side along the optical axis, a first lens with negative optical power, whose first side surface is convex and whose second side surface is concave; a second lens with negative optical power, whose second side surface is concave; a third lens with positive optical power or negative optical power, which is a meniscus lens; a fourth lens with positive optical power; and a fifth lens with positive optical power, whose first side surface is convex; wherein the number of lenses with optical power in the optical lens is five; a curvature radius R5 of a first side surface of the third lens and a curvature radius R6 of a second side surface of the third lens satisfy: 0.6≤R5 / R6≤1.6; an air interval d45 between the fourth lens and the fifth lens on the optical axis and an optical total length TTL of the optical lens satisfy: 0.05≤d45 / TTL≤0.3.

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] With the continuous development of science and technology, optical lenses are widely used in fields such as the smart car industry, and higher requirements are placed on optical lenses. For example, optical lenses must meet requirements such as miniaturization, low cost, high uniformity and small aperture.

[0003] However, the optical lens uses an aspherical lens to correct aberrations, which is not conducive to reducing costs, miniaturization, and high resolution. It also requires additional light homogenization elements to improve the uniformity of the optical lens, which is difficult to process and expensive. In addition, the front and rear port diameters of the optical lens are too large, which is not conducive to the installation and miniaturization of the optical lens. Summary of the invention

[0004] The first aspect of the present application provides an optical lens, which includes, in sequence from the first side to the second side along the optical axis, a first lens with negative optical power, whose first side surface is convex and whose second side surface is concave; a second lens with negative optical power, whose second side surface is concave; a third lens with positive optical power or negative optical power, the third lens being a meniscus lens; a fourth lens with positive optical power; a fifth lens with positive optical power, whose first side surface is convex; wherein the number of lenses with optical power in the optical lens is five; the curvature radius R5 of the first side surface of the third lens and the curvature radius R6 of the second side surface of the third lens satisfy: 0.6≤R5 / R6≤1.6; the air interval d45 between the fourth lens and the fifth lens on the optical axis and the total optical length TTL of the optical lens satisfy: 0.05≤d45 / TTL≤0.3.

[0005] According to an exemplary embodiment of the present application, the total optical length TTL of the optical lens and the total effective focal length F of the optical lens satisfy: 9.5≤TTL / F≤15.

[0006] According to an exemplary embodiment of the present application, the total optical length TTL of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy: 0.03≤TTL / H / FOV×1°≤0.07.

[0007] According to an exemplary embodiment of the present application, the maximum light clearance aperture D of the first side surface of the first lens corresponding to the maximum field of view of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy: 0.01≤D / H / FOV×1°≤0.03.

[0008] According to an exemplary embodiment of the present application, the total effective focal length F of the optical lens and the image height H corresponding to the maximum field angle of the optical lens satisfy: 0.3≤F / H≤0.6.

[0009] According to an exemplary embodiment of the present application, the effective focal length F2 of the second lens and the total effective focal length F of the optical lens satisfy: -3.8≤F2 / F≤-1.5.

[0010] According to an exemplary embodiment of the present application, the effective focal length F3 of the third lens and the total effective focal length F of the optical lens satisfy: 3≤|F3 / F|≤45.

[0011] According to an exemplary embodiment of the present application, the effective focal length F5 of the fifth lens and the total effective focal length F of the optical lens satisfy: 3.5≤F5 / F≤6.5.

[0012] According to an exemplary embodiment of the present application, a radius of curvature R9 of the first side surface of the fifth lens and a total effective focal length F of the optical lens satisfy: 2.5≤R9 / F≤7.

[0013] According to an exemplary embodiment of the present application, the maximum clear aperture D of the first side of the first lens corresponding to the maximum field angle of the optical lens and the maximum clear aperture D10 of the second side of the fifth lens corresponding to the maximum field angle of the optical lens satisfy: 1<D / D10≤1.6.

[0014] According to an exemplary embodiment of the present application, the image height H corresponding to the maximum field angle of the optical lens, the total effective focal length F of the optical lens and the arc value θ of the maximum field angle of the optical lens satisfy: 0.45≤(H / 2) / (F×tan(θ / 2))≤0.75.

[0015] According to an exemplary embodiment of the present application, the maximum field of view FOV of the optical lens and the angle β1 formed by the edge field of view chief ray and the first virtual surface located between the second side surface of the second lens and the first side surface of the third lens satisfy: 1.5≤(FOV / 2) / β1≤4.2.

[0016] According to an exemplary embodiment of the present application, the angle β2 formed by the edge field chief ray and the second virtual surface located between the second side surface of the third lens and the first side surface of the fourth lens satisfies the maximum field of view angle FOV of the optical lens: 0.2≤β2 / (FOV / 2)≤0.4.

[0017] According to an exemplary embodiment of the present application, a curvature radius R2 of the second side surface of the first lens, a curvature radius R1 of the first side surface of the first lens, and a center thickness d1 of the first lens on the optical axis satisfy: 1.3≤R2 / (R1+d1)≤2.2.

[0018] According to an exemplary embodiment of the present application, the optical lens satisfies at least one of the following conditional formulas: 1.4≤D10 / H≤2; 56°≤(FOV×F) / H≤62°; -6≤F1 / F≤-1.8; 1.5≤F4 / F≤13; 2.5≤R1 / F≤4.5; 0.6≤R2 / F≤2.5; 0.5≤R4 / F≤3; 0.2≤|R5| / (|R6|+d5)≤1.3; 0.12≤d45 / TTL≤0.28; 0.14≤BFL / TTL≤0.22; |R7 / F|≥5;

[0019] Among them, D10 is the maximum clear aperture of the second side of the fifth lens corresponding to the maximum field of view of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, FOV is the maximum field of view of the optical lens, F is the total effective focal length of the optical lens, F1 is the effective focal length of the first lens, F4 is the effective focal length of the fourth lens, 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, R4 is the radius of curvature of the second side of the second lens, R5 is the radius of curvature of the first side of the third lens, R6 is the radius of curvature of the second side of the third lens, d5 is the center thickness of the third lens on the optical axis, d45 is the air gap between the fourth lens and the fifth lens on the optical axis, TTL is the total optical length of the optical lens, BFL is the back focal length of the optical lens, and R7 is the radius of curvature of the first side of the fourth lens.

[0020] According to an exemplary embodiment of the present application, the first side surface of the second lens is a convex surface or a concave surface.

[0021] According to an exemplary embodiment of the present application, the first side surface of the fourth lens is a plane, and the second side surface is a convex surface; or, the first side surface of the fourth lens is a convex surface, and the second side surface is a convex surface; or, the first side surface of the fourth lens is a concave surface, and the second side surface is a convex surface; or, the first side surface of the fourth lens is a convex surface, and the second side surface is a concave surface.

[0022] According to an exemplary embodiment of the present application, the second side surface of the fifth lens is a convex surface or a concave surface.

[0023] According to an exemplary embodiment of the present application, the optical lens satisfies at least one of the following conditional formulas: 0.16≤BFL / TTL≤0.2; 1.5≤D10 / H≤1.85; 0.04≤TTL / H / FOV×1°≤0.06; 0.015≤D / H / FOV×1°≤0.025; 58°≤(FOV×F) / H≤60°; 0.4≤F / H≤0.55; -5≤F1 / F≤-2.5; -3.2≤F2 / F≤-2; 5≤|F3 / F|≤40; 2.5≤F4 / F≤9.5; 4≤F5 / F≤6; 2.8≤R1 / F≤4.2; 1≤R2 / F≤2; 0.8≤R4 / F≤2; 3.5≤R9 / F≤6.2; 0.9≤R5 / R6≤1.5; 0.45≤|R5| / (|R6|+d5)≤1.05; 1.1≤D / D10≤1.42; 0.55≤(H / 2) / (F×tan(θ / 2 ))≤0.65; 2≤(FOV / 2) / β1≤3.7; 0.26≤β2 / (FOV / 2)≤0.36; 0.15≤d45 / TTL≤0.25; 1.5≤R2 / (R1+d1)≤2; 10.8≤TTL / F≤14.1; |R7 / F|≥6.5;

[0024] Wherein, BFL is the back focal length of the optical lens, TTL is the total optical length of the optical lens, D10 is the maximum clear aperture of the second side of the fifth lens corresponding to the maximum field of view of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, FOV is the maximum field of view of the optical lens, D is the maximum clear aperture of the first side of the first lens corresponding to the maximum field of view of the optical lens, F is the total effective focal length of the optical lens, F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, F3 is the effective focal length of the third lens, F4 is the effective focal length of the fourth lens, F5 is the effective focal length of the fifth lens, R1 is the curvature radius of the first side of the first lens, R2 is the curvature radius of the second side of the first lens, R4 is the curvature radius of the second lens R9 is the radius of curvature of the second side of the fifth lens, R5 is the radius of curvature of the first side of the third lens, R6 is the radius of curvature of the second side of the third lens, d5 is the center thickness of the third lens on the optical axis, θ is the radian value of the maximum field of view angle of the optical lens, β1 is the angle formed by the edge field chief ray and the first virtual surface between the second side of the second lens and the first side of the third lens, β2 is the angle formed by the edge field chief ray at the second virtual surface between the second side of the third lens and the first side of the fourth lens, d45 is the air interval between the fourth lens and the fifth lens on the optical axis, d1 is the center thickness of the first lens on the optical axis, and R7 is the radius of curvature of the first side of the fourth lens.

[0025] The second aspect of the present application provides such an electronic device, which includes the optical lens in the above exemplary embodiment. The electronic device also includes an imaging element or a light source, wherein the imaging element is used to convert the optical image or optical information formed by the optical lens into an electrical signal; the imaging element is located on the second side of the optical lens, and the light from the first side is imaged on the second side after passing through the optical lens; the light source is located on the second side of the optical lens, and the light emitted by the light source is projected to the first side of the optical lens after passing through the optical lens, and forms an image or illuminates an area on the first side.

[0026] According to the optical lens of the embodiment of the present application, five lenses are used. By controlling the ratio of the radius of curvature of the first side surface of the third lens to the radius of curvature of the second side surface of the third lens, the radius of curvature of the first side surface and the second side surface of the third lens can be made closer, which is conducive to realizing the concentric circle structure of the third lens, ensuring that the third lens smoothly transitions the light from the first side to the rear optical system, improving the imaging quality, and balancing the light sizes at the front and rear ends of the optical lens, so as to realize the miniaturization of the angle expansion lens group formed by the first lens and the second lens; at the same time, by controlling the ratio of the air gap between the fourth lens and the fifth lens on the optical axis to the total optical length of the optical lens, the air gap between the fourth lens and the fifth lens on the optical axis can be made within a reasonable range, ensuring miniaturization while increasing the difference in the degree of deflection of light at different apertures in the same field of view, which is conducive to achieving good uniformity of each field of view. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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 which:

[0028] Figure 1 A schematic structural diagram of an optical lens according to Embodiment 1 of the present application is shown;

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

[0030] Figure 3 A schematic structural diagram of an optical lens according to Embodiment 3 of the present application is shown;

[0031] Figure 4 A schematic structural diagram of an optical lens according to Embodiment 4 of the present application is shown;

[0032] Figure 5 A schematic structural diagram of an optical lens according to Embodiment 5 of the present application is shown;

[0033] Figure 6 A schematic structural diagram of an optical lens according to Embodiment 6 of the present application is shown;

[0034] Figure 7 A schematic structural diagram of an optical lens according to Embodiment 7 of the present application is shown;

[0035] Figure 8 A schematic structural diagram of an optical lens according to Example 8 of the present application is shown;

[0036] Fig. 9 A schematic structural diagram of an optical lens according to Example 9 of the present application is shown;

[0037] Fig.10 A schematic structural diagram of an optical lens according to Embodiment 10 of the present application is shown;

[0038] Fig.11 A schematic structural diagram of an optical lens according to Example 11 of the present application is shown;

[0039] Fig.12 A schematic structural diagram of an optical lens according to Embodiment 12 of the present application is shown;

[0040] Fig.13 A schematic structural diagram of an optical lens according to Example 13 of the present application is shown;

[0041] Fig.14 A schematic structural diagram of an optical lens according to Embodiment 14 of the present application is shown;

[0042] Fig.15 A schematic structural diagram of an optical lens according to Embodiment 15 of the present application is shown;

[0043] Fig.16 A schematic structural diagram of an optical lens according to Example 16 of the present application is shown;

[0044] Fig.17 A schematic structural diagram of an optical lens according to Embodiment 17 of the present application is shown;

[0045] Fig.18 A schematic structural diagram of an optical lens according to Example 18 of the present application is shown;

[0046] Fig.19 A schematic structural diagram of an optical lens according to Example 19 of the present application is shown;

[0047] Fig. 20 A schematic diagram of a partition of a light source according to the present application is shown;

[0048] Fig.21 A schematic diagram showing the radiation intensity of a single partition of a light source according to the present application at different angles is shown;

[0049] Fig. 22A schematic diagram showing the radiation intensity of the central area of ​​the optical lens according to Example 1 of the present application is shown;

[0050] Fig.23 A schematic diagram showing the radiation intensity of the edge area of ​​the optical lens according to Example 1 of the present application is shown;

[0051] Fig.24 A schematic diagram showing redundancy of the central area of ​​the optical lens according to Embodiment 1 of the present application is shown;

[0052] Fig.25 A schematic diagram showing redundancy of an edge region of an optical lens according to Embodiment 1 of the present application is shown;

[0053] Fig.26 A schematic diagram showing the radiation intensity of the central area of ​​the optical lens according to Example 13 of the present application is shown;

[0054] Fig. 27 A schematic diagram showing the radiation intensity of the edge area of ​​the optical lens according to Example 13 of the present application is shown;

[0055] Fig.28 A schematic diagram showing redundancy of the central area of ​​the optical lens according to Example 13 of the present application is shown;

[0056] Fig.29 A schematic diagram showing redundancy of an edge region of an optical lens according to Example 13 of the present application is shown;

[0057] Fig.30 A schematic diagram showing the radiation intensity of the central area of ​​the optical lens according to Example 18 of the present application is shown;

[0058] Fig.31 A schematic diagram showing the radiation intensity of the edge area of ​​the optical lens according to Example 18 of the present application is shown;

[0059] Fig.32 A schematic diagram showing redundancy of the central area of ​​the optical lens according to Example 18 of the present application is shown;

[0060] Fig.33 A schematic diagram showing the redundancy of the edge area of ​​the optical lens according to Example 18 of the present application is shown. DETAILED DESCRIPTION

[0061] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying 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 numerals refer to the same elements.

[0062] 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.

[0063] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are 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 for illustration only and are not drawn strictly to scale.

[0064] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the first side is called the first side surface of the lens, and the surface of each lens closest to the second side is called the second side surface of the lens.

[0065] It should also be understood that the terms "include", "comprising", and / or "having", 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 describing embodiments of the present application, the term "may" is used to indicate "one or more embodiments of the present application". Furthermore, the term "exemplary" is intended to refer to an example or illustration.

[0066] 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 the same meaning as 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.

[0067] 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.

[0068] The features, principles and other aspects of the present application are described in detail below.

[0069] The optical lens according to an exemplary embodiment of the present application may include, for example, five lenses having optical power, namely, a first lens, a second lens, a third lens, a fourth lens and a fifth lens, and the five lenses are arranged in sequence from the first side to the second side along the optical axis.

[0070] In an exemplary embodiment, the optical lens may be used as, for example, an imaging lens, in which case the first side of the optical lens may be an object side and the second side may be an image side. Light from the object side may be imaged on the image side. The second side of the optical lens is provided with an imaging surface of the optical lens.

[0071] In an exemplary embodiment, the optical lens can be used as, for example, a projection lens or a laser radar transmitting end lens. In this case, the second side of the optical lens can be an image source side, and the first side can be an imaging side. Light from the image source side can be imaged on the imaging side. The second side of the optical lens is provided with an image source surface of the optical lens.

[0072] In an exemplary embodiment, the first lens may have a negative optical power, and its first side surface may be, for example, a convex surface, and the second side surface may be, for example, a concave surface. The first lens is designed as a negative lens, which has a divergent effect on light, can disperse the central light and the edge light of each field of view, and collect more light to enter the system, thereby increasing the light throughput of the optical lens; at the same time, the first side surface of the first lens is a convex surface with a small radius of curvature, which is conducive to shrinking the front light and reducing the incident height of the light on the first side surface of the second lens, thereby reducing the front port diameter of the optical lens; the second side surface of the first lens is a concave surface with a small radius of curvature, which is conducive to diverging the light, controlling the trend of the edge large-angle light, increasing the incident angle of the large-angle light, thereby increasing the deflection angle of the light in the lens, and making the rear optical system have a larger light receiving surface, collecting light as much as possible, and improving the overall light throughput of the optical lens. As an example, the first side surface of the first lens is set to a convex surface, which is conducive to the sliding of water droplets and reducing the influence of external environments such as water droplets on the imaging quality. As an example, the first lens is made of a high refractive index material, which is conducive to reducing the front port diameter of the optical lens and improving the imaging quality of the optical lens.

[0073] In an exemplary embodiment, the second lens may have a negative optical power, and its first side surface may be, for example, a convex surface, and its second side surface may be, for example, a concave surface. The second lens is designed as a negative lens, which can collect light from the first lens and smoothly transition it to the rear optical system. The second lens further disperses the central light and the edge light of each field of view, which is conducive to expanding the aperture of the aperture. In addition, the first side surface of the second lens is a convex surface, which is conducive to collecting as much light as possible from the edge field of view.

[0074] In an exemplary embodiment, the second lens may have a negative optical power, and its first side surface may be, for example, a concave surface, and its second side surface may be, for example, a concave surface. The second lens is designed as a biconcave negative lens, which is conducive to diverging the light from the first lens and smoothly transitioning it to the rear optical system, and collecting as much light as possible to improve the overall light throughput of the optical lens.

[0075] In an exemplary embodiment, the third lens may have positive focal power, and its first side surface may be, for example, a concave surface, and its second side surface may be, for example, a convex surface. The third lens is a positive lens, which can smoothly transition the light from the second lens to the rear optical system, and compress the front light, balance the size of the front and rear light of the optical lens, and realize the miniaturization of the angle expansion lens group formed by the first lens and the second lens. At the same time, the first side surface of the third lens is close to the second side surface, and the third lens approximately forms a concentric circle structure, which can reduce the difference in the deflection ability of the third lens to each field of view light, which is conducive to controlling the collimation ratio of each field of view light within a certain range, achieving good uniformity of each field of view, and improving the imaging quality of the optical lens.

[0076] In an exemplary embodiment, the third lens may have a negative optical power, and its first side surface may be, for example, a convex surface, and its second side surface may be, for example, a concave surface. The third lens is a negative lens, which can smoothly transition the light from the second lens to the rear optical system, improve the imaging quality, and balance the light sizes at the front and rear ends of the optical lens, thereby realizing the miniaturization of the angle-expanding lens group formed by the first lens and the second lens. At the same time, the first side surface of the third lens has a radius of curvature close to that of the second side surface, and the third lens approximately forms a concentric circle structure, which can reduce the difference in the deflection ability of the third lens to each field of view light, and is conducive to controlling the collimation ratio of each field of view light within a certain range, achieving good uniformity of each field of view, and improving the imaging quality of the optical lens.

[0077] In an exemplary embodiment, the fourth lens may have a positive optical power, and its first side surface may be, for example, a plane, and its second side surface may be, for example, a convex surface. The fourth lens is a positive lens, which can collect as much light of a large field of view as possible to enter the rear optical system, which is conducive to making the light transmission of the edge area and the central area of ​​the optical lens close, thereby improving the uniformity and imaging quality of the optical lens. In addition, the first side surface of the fourth lens is set as a plane, which can effectively improve the processability of the fourth lens, reduce production costs, and reduce the assembly tolerance when it bears against the spacer. The second side surface of the fourth lens is a convex surface, which can further converge light and realize the miniaturization of the optical lens.

[0078] In an exemplary embodiment, the fourth lens may have positive optical power, and its first side surface may be, for example, a convex surface, and its second side surface may be, for example, a concave surface. The fourth lens is a meniscus-shaped positive lens convex to the first side, which can collect as much light of a large field of view as possible to enter the rear optical system, which is conducive to making the light transmission of the edge area and the central area of ​​the optical lens close, thereby improving the uniformity and imaging quality of the optical lens.

[0079] In an exemplary embodiment, the fourth lens may have positive power, and its first side surface may be, for example, a concave surface, and its second side surface may be, for example, a convex surface. The fourth lens is a positive lens, which can collect as much light of a large field of view as possible to enter the rear optical system, and control the trend of light of large angles at the edge, which is conducive to making the light transmission of the edge area and the central area of ​​the optical lens close, thereby improving the uniformity and imaging quality of the optical lens.

[0080] In an exemplary embodiment, the fourth lens may have positive optical power, and its first side surface may be, for example, a convex surface, and its second side surface may be, for example, a convex surface. The fourth lens is a meniscus-shaped positive lens convex to the second side, which can receive the light emitted from the third lens and properly converge it, further making the light trend transition smoothly, improving the imaging quality of the optical lens, and reducing the rear port diameter of the optical lens.

[0081] In an exemplary embodiment, the fifth lens may have positive optical power, and its first side surface may be, for example, a convex surface, and the second side surface may be, for example, a concave surface. The fifth lens is a positive lens, which cooperates with the fourth lens to converge light, effectively reduce the total length of the optical system, and realize the miniaturization of the optical system. At the same time, it can also make the light smoothly transition to the imaging surface or the image source surface, reducing aberrations. The shape of the fifth lens is convex and concave, which can collect as much large-angle light as possible to enter the rear optical system, and control the trend of large-angle light at the edge, which is conducive to making the light transmittance of the edge area and the central area of ​​the optical lens close, reducing the image brightness difference in the imaging area, and improving the uniformity and imaging quality of the optical lens. Further, the optical lens can be applied to the laser radar transmitting lens.

[0082] In an exemplary embodiment, the fifth lens may have a positive optical power, and its first side surface may be, for example, a convex surface, and its second side surface may be, for example, a convex surface. The fifth lens is a positive lens, which can converge the light emitted from the fourth lens, and the fifth lens is biconvex and has a flat surface trend, which can effectively transition the light to the rear optical system, thereby improving the imaging quality of the optical lens. In addition, the fifth lens is biconvex, which can enable the fifth lens to achieve two convergences of light, especially the edge light is deflected toward the optical axis after passing through the second side surface of the fifth lens, which is beneficial to shorten the distance between the fifth lens and the imaging surface or the image source surface, reduce the total optical length of the optical lens, and realize the miniaturization of the optical lens. The fifth lens cooperates with the fourth lens to enable the light to smoothly transition to the imaging surface or the image source surface, and the light transmittance of the edge area and the central area of ​​the optical lens is close, which reduces the image brightness difference in the imaging area, thereby improving the imaging quality of the optical lens.

[0083] In an exemplary embodiment, the optical lens may further include an aperture, which may be, for example, disposed between the second lens and the third lens. By disposing the aperture between the second lens and the third lens, it is advantageous for the light to smoothly transition to the rear of the system, reduce the aperture of the rear lens, and reduce the assembly sensitivity of the optical lens. It should be understood that the aperture is disposed between the second lens and the third lens for exemplary purposes only, and the present application does not impose any specific limitation thereto, and the aperture may also be disposed at other positions according to actual needs.

[0084] In an exemplary embodiment, the optical lens may further include a photosensitive element disposed on the second side. Optionally, the photosensitive element disposed on the second side may be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS).

[0085] In an exemplary embodiment, the total optical length TTL of the optical lens and the total effective focal length F of the optical lens satisfy: 9.5≤TTL / F≤15. Further, 10.8≤TTL / F≤14.1. Reasonable configuration of the ratio of the total optical length of the optical lens to the total effective focal length of the optical lens can enable the optical lens to have a larger field of view and realize the miniaturization of the optical lens.

[0086] In an exemplary embodiment, the back focal length BFL of the optical lens and the total optical length TTL of the optical lens satisfy: 0.14≤BFL / TTL≤0.22. Further, 0.16≤BFL / TTL≤0.2. By rationally configuring the ratio of the back focal length of the optical lens to the total optical length of the optical lens, sufficient space can be reserved for the installation and focusing of other optical elements on the basis of miniaturization of the optical lens, avoiding interference of adjacent optical elements.

[0087] In an exemplary embodiment, the maximum clear aperture D10 of the second side surface of the fifth lens corresponding to the maximum field angle of the optical lens and the image height H corresponding to the maximum field angle of the optical lens satisfy: 1.4≤D10 / H≤2. Further, 1.5≤D10 / H≤1.85. By rationally configuring the ratio of the maximum clear aperture of the second side surface of the fifth lens corresponding to the maximum field angle of the optical lens to the image height corresponding to the maximum field angle of the optical lens, the maximum clear aperture of the second side surface of the fifth lens can be controlled within a certain range, so that the clear aperture of the fifth lens is greater than the image height of the imaging surface or the image source surface, which is beneficial to reduce the difference in the angle between the upper light and the lower light of the edge field of view and the central light, and is beneficial to the parallel transition of the main light to the imaging surface or the image source surface, so as to achieve a small main light angle of the optical lens.

[0088] In an exemplary embodiment, the total optical length TTL of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy: 0.03≤TTL / H / FOV×1°≤0.07. Further, 0.04≤TTL / H / FOV×1°≤0.06. By rationally configuring the relationship between the total optical length of the optical lens, the image height corresponding to the maximum field of view of the optical lens, and the maximum field of view of the optical lens, when the ratio of the image height to the field of view is constant, the total length of the optical lens can be effectively limited, thereby realizing the miniaturization of the optical lens.

[0089] In an exemplary embodiment, the maximum clear aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy: 0.01≤D / H / FOV×1°≤0.03. Further, 0.015≤D / H / FOV×1°≤0.025. Reasonable configuration of the relationship between the maximum clear aperture of the first side of the first lens corresponding to the maximum field of view of the optical lens, the image height corresponding to the maximum field of view of the optical lens, and the maximum field of view of the optical lens can reduce the front port diameter of the optical lens, which is conducive to miniaturization of the optical system.

[0090] In an exemplary embodiment, the maximum field of view FOV of the optical lens, the total effective focal length F of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens satisfy: 56°≤(FOV×F) / H≤62°. Further, 58°≤(FOV×F) / H≤60°. Reasonable configuration of the relationship between the maximum field of view of the optical lens, the total effective focal length of the optical lens, and the image height corresponding to the maximum field of view of the optical lens is conducive to achieving a large field of view and small distortion of the optical lens when the image height and the total effective focal length are constant.

[0091] In an exemplary embodiment, the total effective focal length F of the optical lens and the image height H corresponding to the maximum field angle of the optical lens satisfy: 0.3≤F / H≤0.6. Further, 0.4≤F / H≤0.55. Reasonable configuration of the ratio of the total effective focal length of the optical lens to the image height corresponding to the maximum field angle of the optical lens can match the maximum field angle of the optical lens with the image height, thereby improving the resolution capability of the optical lens.

[0092] In an exemplary embodiment, the effective focal length F1 of the first lens and the total effective focal length F of the optical lens satisfy: -6≤F1 / F≤-1.8. Further, -5≤F1 / F≤-2.5. Reasonable configuration of the ratio of the effective focal length of the first lens to the total effective focal length of the optical lens can make the first lens a negative lens and disperse the central light and the edge light of each field of view. At the same time, the optical power of the first lens is relatively large, and the light emitted from the first lens is conducive to forming a larger field of view, achieving the effect of expanding the angle.

[0093] In an exemplary embodiment, the effective focal length F2 of the second lens and the total effective focal length F of the optical lens satisfy: -3.8≤F2 / F≤-1.5. Further, -3.2≤F2 / F≤-2. Reasonable configuration of the ratio of the effective focal length of the second lens to the total effective focal length of the optical lens can make the second lens a negative lens and smoothly transition the light emitted by the first lens to the rear optical system after divergence. At the same time, it can also collect as much field light as possible, increase the light throughput of the optical lens, and cooperate with the first lens with negative optical focal length to ensure the light flux and imaging effect while achieving the effect of expanding the angle.

[0094] In an exemplary embodiment, the effective focal length F3 of the third lens and the total effective focal length F of the optical lens satisfy: 3≤|F3 / F|≤45. Further, 5≤|F3 / F|≤40. By rationally configuring the ratio of the effective focal length of the third lens to the total effective focal length of the optical lens, the focal power of the third lens can be constrained within a certain range, and the light from the second lens can be smoothly transitioned to the rear optical system, thereby improving the image quality; at the same time, the third lens approximately forms a concentric circle structure, and the focal length of the third lens is relatively large, which can reduce the difference in the deflection ability of the third lens to the light of each field of view, and is conducive to controlling the collimation ratio of the light of each field of view within a certain range, achieving good uniformity of each field of view, and improving the imaging quality of the optical lens.

[0095] In an exemplary embodiment, the effective focal length F4 of the fourth lens and the total effective focal length F of the optical lens satisfy: 1.5≤F4 / F≤13. Further, 2.5≤F4 / F≤9.5. Reasonable configuration of the effective focal length of the fourth lens can collect as much light of a large field of view as possible to enter the rear optical system, and control the trend of light of large angles at the edge, so as to achieve a small aperture of the optical lens.

[0096] In an exemplary embodiment, the effective focal length F5 of the fifth lens and the total effective focal length F of the optical lens satisfy: 3.5≤F5 / F≤6.5. Further, 4≤F5 / F≤6. The effective focal length of the fifth lens is reasonably configured, and the fifth lens cooperates with the fourth lens, which is conducive to converging the front light and smoothly transmitting the light to the imaging surface or the image source surface, effectively achieving good uniformity of each field of view, and improving the imaging quality of the optical lens, and realizing a small main light angle of the optical lens.

[0097] In an exemplary embodiment, the radius of curvature R1 of the first side surface of the first lens and the total effective focal length F of the optical lens satisfy: 2.5≤R1 / F≤4.5. Further, 2.8≤R1 / F≤4.2. Reasonable configuration of the ratio of the radius of curvature of the first side surface of the first lens to the total effective focal length of the optical lens can make the first lens convex and have a smaller radius of curvature, which is conducive to shrinking the front light, reducing the incident width of the light on the first side surface of the second lens, and reducing the front port diameter of the optical lens.

[0098] In an exemplary embodiment, the radius of curvature R2 of the second side surface of the first lens and the total effective focal length F of the optical lens satisfy: 0.6≤R2 / F≤2.5. Further, 1≤R2 / F≤2. Reasonable configuration of the ratio of the radius of curvature of the second side surface of the first lens to the total effective focal length of the optical lens can make the second side surface of the first lens concave and have a small radius of curvature, which is conducive to diverging the light. The second side surface of the first lens can increase the incident angle of large-angle light in cooperation with the first side surface, thereby increasing the deflection angle of light in the lens, which is conducive to collecting as much light as possible and improving the light throughput of the optical lens.

[0099] In an exemplary embodiment, the radius of curvature R4 of the second side surface of the second lens and the total effective focal length F of the optical lens satisfy: 0.5≤R4 / F≤3. Further, 0.8≤R4 / F≤2. Reasonable configuration of the ratio of the radius of curvature of the second side surface of the second lens to the total effective focal length of the optical lens can make the second side surface of the second lens a concave surface with a small radius of curvature, which is beneficial to diverging the light, increasing the incident angle of large-angle light, improving the light transmittance of the optical lens, and facilitating the reduction of the aperture of the first lens.

[0100] In an exemplary embodiment, the radius of curvature R9 of the first side surface of the fifth lens and the total effective focal length F of the optical lens satisfy: 2.5≤R9 / F≤7. Further, 3.5≤R9 / F≤6.2. Reasonable configuration of the ratio of the radius of curvature of the first side surface of the fifth lens to the total effective focal length of the optical lens can make the first side surface of the fifth lens convex, ensure that the first side surface of the fifth lens bears more optical power, which is conducive to compressing the light aperture of the first side surface and the second side surface of the fifth lens, achieving a smooth transition of light, and realizing the miniaturization of the optical lens.

[0101] In an exemplary embodiment, the radius of curvature R5 of the first side surface of the third lens and the radius of curvature R6 of the second side surface of the third lens satisfy: 0.6≤R5 / R6≤1.6. Preferably, 0.9≤R5 / R6≤1.5. Reasonable configuration of the ratio of the radius of curvature of the first side surface of the third lens to the radius of curvature of the second side surface of the third lens can make the shapes of the two side surfaces of the third lens bend in the same direction, and control the radii of curvature of the two side surfaces of the third lens to be closer, that is, the third lens is similar to a concentric circle structure, which is conducive to the smooth transition of light and improves the imaging quality of the optical lens. At the same time, it can also balance the light size at the front and rear ends of the optical lens, and realize the miniaturization of the angle expansion lens group formed by the first lens and the second lens.

[0102] In an exemplary embodiment, the radius of curvature R5 of the first side surface of the third lens, the radius of curvature R6 of the second side surface of the third lens, and the center thickness d5 of the third lens on the optical axis satisfy: 0.2≤|R5| / (|R6|+d5)≤1.3. Further, 0.45≤|R5| / (|R6|+d5)≤1.05. Reasonable configuration of the relationship between the radius of curvature of the first side surface of the third lens, the radius of curvature of the second side surface of the third lens, and the center thickness of the third lens on the optical axis can make the third lens similar to a concentric circle structure, reduce the difference in the deflection ability of the third lens to each field of view light, and help control the collimation ratio of each field of view light within a certain range, achieve good uniformity of each field of view, and improve the imaging quality of the optical lens.

[0103] In an exemplary embodiment, the maximum clear aperture D of the first side surface of the first lens corresponding to the maximum field angle of the optical lens and the maximum clear aperture D10 of the second side surface of the fifth lens corresponding to the maximum field angle of the optical lens satisfy: 1<D / D10≤1.6. Further, 1.1≤D / D10≤1.42. Reasonable configuration of the ratio of the maximum clear aperture of the first side surface of the first lens corresponding to the maximum field angle of the optical lens to the maximum clear aperture of the second side surface of the fifth lens corresponding to the maximum field angle of the optical lens can make the front port diameter of the optical lens larger than the rear port diameter of the optical lens and constrain the ratio of the two within a reasonable range, which is conducive to reducing the overall volume of the optical lens and facilitating the installation of the optical lens.

[0104] In an exemplary embodiment, the total effective focal length F of the optical lens, the image height H corresponding to the maximum field angle of the optical lens, and the radian value θ of the maximum field angle of the optical lens satisfy: 0.45≤(H / 2) / (F×tan(θ / 2))≤0.75. Furthermore, 0.55≤(H / 2) / (F×tan(θ / 2))≤0.65. Reasonable configuration of the relationship between the total effective focal length of the optical lens, the image height corresponding to the maximum field angle of the optical lens, and the radian value of the maximum field angle of the optical lens can reduce the distortion of the optical lens and match the collimation of the light in each field of view, thereby achieving good uniformity in each field of view.

[0105] In an exemplary embodiment, the angle β1 formed by the maximum field of view FOV of the optical lens and the edge field of view principal ray and the first virtual surface between the second side surface of the second lens and the first side surface of the third lens satisfies: 1.5≤(FOV / 2) / β1≤4.2. Further, 2≤(FOV / 2) / β1≤3.7. The first lens and the second lens form an angle expansion lens group, and both the first lens and the second lens can diverge the light, which is conducive to achieving a large field of view angle of the optical lens and good uniformity of each field of view. It should be noted that the edge field of view principal ray in this article can be the principal ray at the maximum field of view position of the optical lens.

[0106] In an exemplary embodiment, the angle β2 formed by the edge field of view principal ray and the second virtual surface between the second side surface of the third lens and the first side surface of the fourth lens satisfies the maximum field of view angle FOV of the optical lens: 0.2≤β2 / (FOV / 2)≤0.4. Further, 0.26≤β2 / (FOV / 2)≤0.36. The fourth lens and the fifth lens form a collimating lens group, and the collimating lens group is used to collimate the light, so that the divergence angle of the light emitted from the collimating lens group is within a certain range, which is conducive to ensuring good uniformity of each field of view, while achieving a small principal light angle and high resolution of the optical lens. It should be noted that the edge field of view principal ray in this article can be the principal ray at the maximum field of view position of the optical lens.

[0107] In an exemplary embodiment, the air interval d45 between the fourth lens and the fifth lens on the optical axis satisfies the total optical length TTL of the optical lens: 0.05≤d45 / TTL≤0.3. By rationally configuring the ratio of the air interval between the fourth lens and the fifth lens on the optical axis to the total optical length of the optical lens, the air interval between the fourth lens and the fifth lens on the optical axis can be controlled within a reasonable range, thereby increasing the difference in the degree of deflection of light at different apertures in the same field of view. Further, 0.12≤d45 / TTL≤0.28. Further, 0.15≤d45 / TTL≤0.25. Properly increasing the air interval between the fourth lens and the fifth lens is more conducive to achieving good uniformity in each field of view.

[0108] In an exemplary embodiment, the radius of curvature R2 of the second side surface of the first lens, the radius of curvature R1 of the first side surface of the first lens, and the center thickness d1 of the first lens on the optical axis satisfy: 1.3≤R2 / (R1+d1)≤2.2. Further, 1.5≤R2 / (R1+d1)≤2. Reasonable configuration of the relationship between the radius of curvature of the first side surface of the first lens, the radius of curvature of the second side surface of the first lens, and the center thickness of the first lens on the optical axis can make the radius of curvature of the two side surfaces of the first lens smaller, and the second side surface more curved, which is conducive to collecting as much light from each field of view as possible, and controlling the trend of light at large angles at the edge, thereby increasing the light throughput of the first lens.

[0109] In an exemplary embodiment, the radius of curvature R7 of the first side surface of the fourth lens and the total effective focal length F of the optical lens satisfy: |R7 / F|≥5. Further, |R7 / F|≥6.5. Reasonable configuration of the ratio of the radius of curvature of the first side surface of the fourth lens to the total effective focal length of the optical lens can make the radius of curvature of the first side surface of the fourth lens relatively large, which is conducive to better receiving the light emitted from the third lens and smoothly transitioning the light to the rear optical system, so that the light transmission of the edge area and the central area of ​​the optical lens is close, thereby improving the uniformity and imaging quality of the optical lens.

[0110] The optical lens according to the above-mentioned embodiment of the present application can adopt multiple lenses, such as the five lenses mentioned above. By reasonably allocating the optical parameters of each lens, the optical lens has a long back focus, a small main light angle, miniaturization, a small aperture, a high resolution, a high uniformity, a large field of view, and a high light flux, and can be well matched with, for example, an on-board chip without causing a dark corner phenomenon. The optical lens has good temperature performance, the imaging effect changes little under high and low temperatures, and the image quality is stable. Therefore, the optical lens according to the above-mentioned embodiment of the present application can better meet the requirements of, for example, on-board applications.

[0111] Those skilled in the art should understand that the total optical length TTL of the optical lens used above refers to the on-axis distance from the first side surface of the first lens to the imaging plane or the image source plane; the back focal length BFL of the optical lens refers to the on-axis distance from the second side surface of the fifth lens to the imaging plane or the image source plane; the maximum field of view FOV of the optical lens is associated with the image height H, which refers to the field of view corresponding to the image height H.

[0112] 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 optical lens can be changed to obtain the various results and advantages described in this specification. For example, although five lenses are described as an example in the embodiment, the optical lens is not limited to including five lenses. If necessary, the optical lens may also include other numbers of lenses.

[0113] Taking the optical lens as the laser radar transmitting end lens as an example, in the process of matching the light source of the transmitting end lens with the single photon avalanche diode SPAD chip of the receiving end lens, the light points of the light source are difficult to be arranged as closely as the pixels in the SPAD chip arranged in a planar array, and the energy of the light source is Gaussian distributed. Therefore, it is usually necessary to homogenize the light beam emitted by the light source. The commonly used homogenization method is to add a homogenization element to the front end of the light source. The homogenization element is relatively fragile, has strict reliability requirements such as scratch resistance, is easy to damage, and is not conducive to the appearance.

[0114] Fig. 20 It is a schematic diagram of the partitioning of the light source according to the present application. Fig.21 Schematic diagram of the radiation intensity of a single partition of the light source according to the present application at different angles. Fig. 20 As shown, the light source may include a plurality of partitions arranged in sequence in the horizontal direction, for example, 12 partitions (e.g., Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10, Q11, Q12), wherein the central areas are Q1 and Q7, and the edge areas are Q6 and Q12. Partitions Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10, Q11, Q12 are 12 angle spaces divided by the maximum field of view of the optical lens according to a preset angle range (e.g., 8°×60°), so that the light in the angle space can be evenly spread out. Take the divergence angle of the light source as 96°×60° as an example, wherein 96° is the horizontal divergence angle, 60° is the vertical divergence angle, 60° can be -30°~30°, and the light source can have 12 partitions, each of which has an angle range of 8° in the horizontal direction and an angle range of 60° in the vertical direction. As shown Fig.21 As shown, the uniformity of a single partition is the result of the combined effects of the top, middle and bottom of the light source, and the light of a single partition needs to be evenly spread out in the above-mentioned angular space. The light source may be, for example, a VCSEL light source.

[0115] Fig. 22 is a schematic diagram of the radiation intensity of the central area of ​​the optical lens according to Example 1 of the present application, Fig.23 is a schematic diagram of the radiation intensity of the edge area of ​​the optical lens according to Example 1 of the present application, Fig.24 is a schematic diagram of redundancy of the central area of ​​the optical lens according to Example 1 of the present application, Fig.25 Schematic diagram of the redundancy of the edge area of ​​the optical lens according to Example 1 of the present application. Fig.26 is a schematic diagram of the radiation intensity of the central area of ​​the optical lens according to Example 13 of the present application, Fig. 27 is a schematic diagram of the radiation intensity of the edge area of ​​the optical lens according to Example 13 of the present application, Fig.28Schematic diagram of redundancy of the central area of ​​the optical lens according to Example 13 of the present application, Fig.29 Schematic diagram of the redundancy of the edge area of ​​the optical lens according to Example 13 of the present application. Fig.30 is a schematic diagram of the radiation intensity of the central area of ​​the optical lens according to Example 18 of the present application, Fig.31 is a schematic diagram of the radiation intensity of the edge area of ​​the optical lens according to Example 18 of the present application, Fig.32 Schematic diagram of redundancy of the central area of ​​the optical lens according to Example 18 of the present application, Fig.33 Schematic diagram of the redundancy of the edge area of ​​the optical lens according to Example 18 of the present application.

[0116] Window efficiency = energy in a single partition / total energy received by the image plane after the light emitted by the light source in a single partition passes through the optical lens. Window efficiency can describe the utilization rate of the light source. The higher the window efficiency, the smaller the energy loss of the light source in the partition after passing through the optical lens.

[0117] The uniformity of a single partition is to divide the single partition area of ​​8°×60° into 20×150 units with a solid angle of 0.4°×0.4° as the unit, and count the Imax and Imin in 3000 units, where the uniformity I=Imin / Imax. The better the uniformity of the transmitting end lens, the more uniform the energy received by the receiving end lens, avoiding the phenomenon of uneven distribution of energy received by each pixel and each position, and the energy at the edge and the center is close. The image brightness difference in the imaging area of ​​the receiving end lens is small, and the imaging effect is better. The uniformity of the present application exceeds 50% in a single partition area of ​​8°×60°. The higher the value, the better the uniformity of the optical lens.

[0118] The single-zone redundancy is to divide the 9.6°×61.6° angle space into 24×154 units with a solid angle of 0.4°×0.4° as the unit, and count the Iman and Imin in 3696 units, where the redundancy I1=Imin / Imax. The better the redundancy of the transmitting end lens, the smaller the image brightness difference in the imaging area of ​​the receiving end lens. The difference between redundancy and uniformity is mainly that the single-zone division of redundancy is 9.6°×61.6°, and the single-zone division of uniformity is 8°×60°, and the range of the redundant angle space is large.

[0119] from Fig. 22 , Fig.23 , Fig.24 and Fig.25 From the above, the window efficiency of the center area of ​​the optical lens of Example 1 is 60.53%, the uniformity is 56.04%, and the redundancy is 42.07%; the window efficiency of the edge area of ​​the optical lens of Example 1 is 60.00%, the uniformity is 53.71%, and the redundancy is 39.40%. Fig.24 and Fig.25 In the figure, the horizontal axis represents the 1-154 units divided by redundancy, and the vertical axis represents the power of each unit in a unit solid angle, and the power unit is Watts / Steradian.

[0120] from Fig.26 , Fig. 27 , Fig.28 and Fig.29 From the above, the window efficiency of the center area of ​​the optical lens of Example 13 is 60.62%, the uniformity is 57.01%, and the redundancy is 41.56%; the window efficiency of the edge area of ​​the optical lens of Example 13 is 61.72%, the uniformity is 53.92%, and the redundancy is 38.68%. Fig.28 and Fig.29 In the figure, the horizontal axis represents the 1-154 units divided by redundancy, and the vertical axis represents the power of each unit in a unit solid angle, and the power unit is Watts / Steradian.

[0121] from Fig.30 , Fig.31 , Fig.32 and Fig.33 From the above, the window efficiency of the center area of ​​the optical lens of Example 18 is 60.09%, the uniformity is 56.53%, and the redundancy is 40.81%; the window efficiency of the edge area of ​​the optical lens of Example 18 is 60.53%, the uniformity is 54.31%, and the redundancy is 39.41%. Fig.32 and Fig.33 In the figure, the horizontal axis represents the 1-154 units divided by redundancy, and the vertical axis represents the power of each unit in a unit solid angle, and the power unit is Watts / Steradian.

[0122] Specific embodiments of the optical lens applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings. Example 1

[0123] The following reference Figure 1 An optical lens according to Example 1 of the present application is described.

[0124] like Figure 1 As shown, the optical lens includes, from the first side to the second side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5. A stop STO may be disposed between the second lens L2 and the third lens L3.

[0125] The first lens L1 has negative refractive power, and its first side surface S1 is a convex surface, and its second side surface S2 is a concave surface.

[0126] The second lens L2 has negative refractive power, and its first side surface S3 is a convex surface, and its second side surface S4 is a concave surface.

[0127] The third lens L3 has positive refractive power, a first side surface S5 of which is a concave surface, and a second side surface S6 of which is a convex surface.

[0128] The fourth lens L4 has positive refractive power, and its first side surface S7 is a plane, and its second side surface S8 is a convex surface.

[0129] The fifth lens L5 has positive refractive power, and its first side surface S9 is convex, and its second side surface S10 is concave.

[0130] The second side of the optical lens is provided with an image plane IMA. When IMA is an imaging plane, light from the object passes through each surface S1 to S10 in sequence and is finally imaged on IMA. When IMA is an image source plane, light from IMA passes through each surface S10 to S1 in sequence and is finally projected on the object.

[0131] Table 1 shows the basic parameters of the optical lens of Example 1, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0132] Table 1

[0133] Example 2

[0134] The following reference Figure 2 The optical lens according to Embodiment 2 of the present application is described. Figure 2 As shown, the main difference between this embodiment and Embodiment 1 is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0135] Table 2 shows the basic parameters of the optical lens of Example 2, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0136] Table 2

[0137] Example 3

[0138] The following reference Figure 3 The optical lens according to Embodiment 3 of the present application is described. Figure 3 As shown, the main differences between this embodiment and Embodiment 1 are: the optical parameters such as the curvature radius of each lens surface and the lens thickness are different; and the first side surface S7 of the fourth lens L4 is a convex surface.

[0139] Table 3 shows the basic parameters of the optical lens of Example 3, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0140] Table 3

[0141] Example 4

[0142] The following reference Figure 4 The optical lens according to Embodiment 4 of the present application is described. Figure 4 As shown, the main differences between this embodiment and Embodiment 1 are: the optical parameters such as the curvature radius of each lens surface and the lens thickness are different; and the first side surface S7 of the fourth lens L4 is a convex surface.

[0143] Table 4 shows the basic parameter table of the optical lens of Example 4, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0144] Table 4

[0145] Example 5

[0146] The following reference Figure 5 The optical lens according to Embodiment 5 of the present application is described. Figure 5 As shown, the main differences between this embodiment and Embodiment 1 are: the optical parameters such as the curvature radius of each lens surface and the lens thickness are different; and the first side surface S7 of the fourth lens L4 is a concave surface.

[0147] Table 5 shows the basic parameter table of the optical lens of Example 5, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0148] Table 5

[0149] Example 6

[0150] The following reference Figure 6 The optical lens according to Example 6 of the present application is described. Figure 6 As shown, the optical lens includes, in sequence from the first side to the second side along the optical axis: Compared with Example 1, the main difference between this embodiment and Example 1 is that: the optical parameters such as the curvature radius of each lens surface and the lens thickness are different; and the first side surface S7 of the fourth lens L4 is a concave surface.

[0151] Table 6 shows the basic parameter table of the optical lens of Example 6, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0152] Table 6

[0153] Example 7

[0154] The following reference Figure 7 The optical lens according to Example 7 of the present application is described. Figure 7 As shown, the optical lens includes, from the first side to the second side along the optical axis: Compared with Example 1, the main differences between this embodiment and Example 1 are: the optical parameters such as the curvature radius of each lens surface and the lens thickness are different; and the first side surface S7 of the fourth lens L4 is a concave surface; the second side surface S10 of the fifth lens L5 is a convex surface.

[0155] Table 7 shows the basic parameter table of the optical lens of Example 7, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0156] Table 7

[0157] Example 8

[0158] The following reference Figure 8 The optical lens according to Example 8 of the present application is described. Figure 8 As shown, the optical lens includes, from the first side to the second side along the optical axis: Compared with Example 1, the main differences between this embodiment and Example 1 are: the optical parameters such as the curvature radius of each lens surface and the lens thickness are different; and the first side surface S7 of the fourth lens L4 is a concave surface; the second side surface S10 of the fifth lens L5 is a convex surface.

[0159] Table 8 shows the basic parameter table of the optical lens of Example 8, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0160] Table 8

[0161] Example 9

[0162] The following reference Fig. 9 The optical lens according to Example 9 of the present application is described. Fig. 9 As shown, the optical lens includes, from the first side to the second side along the optical axis: Compared with Example 1, the main differences between this embodiment and Example 1 are: the optical parameters such as the curvature radius of each lens surface and the lens thickness are different; and the first side surface S7 of the fourth lens L4 is a convex surface; the second side surface S10 of the fifth lens L5 is a convex surface.

[0163] Table 9 shows the basic parameter table of the optical lens of Example 9, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0164] Table 9

[0165] Example 10

[0166] The following reference Fig.10 The optical lens according to embodiment 10 of the present application is described. Fig.10 As shown, the optical lens includes, from the first side to the second side along the optical axis: Compared with Example 1, the main differences between this embodiment and Example 1 are: the optical parameters such as the curvature radius of each lens surface and the lens thickness are different; and the first side surface S7 of the fourth lens L4 is a convex surface; the second side surface S10 of the fifth lens L5 is a convex surface.

[0167] Table 10 shows a basic parameter table of the optical lens of Example 10, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0168] Table 10

[0169] Embodiment 11

[0170] The following reference Fig.11 The optical lens according to Example 11 of the present application is described. Fig.11 As shown, the optical lens includes, in sequence from the first side to the second side along the optical axis: Compared with Example 1, the main difference between this embodiment and Example 1 is that: the optical parameters such as the curvature radius of each lens surface and the lens thickness are different; and the first side surface S7 of the fourth lens L4 is a convex surface, and the second side surface S8 is a concave surface.

[0171] Table 11 shows the basic parameter table of the optical lens of Example 11, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0172] Table 11

[0173] Example 12

[0174] The following reference Fig.12 The optical lens according to Example 12 of the present application is described. Fig.12 As shown, the optical lens includes, in sequence from the first side to the second side along the optical axis: Compared with Example 1, the main difference between this embodiment and Example 1 is that: the optical parameters such as the curvature radius of each lens surface and the lens thickness are different; and the first side surface S7 of the fourth lens L4 is a convex surface, and the second side surface S8 is a concave surface.

[0175] Table 12 shows the basic parameter table of the optical lens of Example 12, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0176] Table 12

[0177] Embodiment 13

[0178] The following reference Fig.13 The optical lens according to embodiment 13 of the present application is described. Fig.13 As shown, the optical lens includes, from the first side to the second side along the optical axis: Compared with Example 1, the main differences between this embodiment and Example 1 are: the optical parameters such as the curvature radius of each lens surface and the lens thickness are different; and the first side surface of the second lens L2 is a concave surface; the third lens L3 has negative optical power, and its first side S5 is a convex surface, and the second side surface S6 is a concave surface; the first side surface S7 of the fourth lens L4 is a convex surface, and the second side surface S8 is a convex surface; the second side surface S10 of the fifth lens L5 is a convex surface.

[0179] Table 13 shows the basic parameter table of the optical lens of Example 13, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0180] Table 13

[0181] Embodiment 14

[0182] The following reference Fig.14 The optical lens according to embodiment 14 of the present application is described. Fig.14 As shown, the optical lens includes, from the first side to the second side along the optical axis: Compared with Example 1, the main differences between this embodiment and Example 1 are: the optical parameters such as the curvature radius of each lens surface and the lens thickness are different; and the first side surface of the second lens L2 is a concave surface; the third lens L3 has negative optical power, and its first side S5 is a convex surface, and the second side surface S6 is a concave surface; the first side surface S7 of the fourth lens L4 is a convex surface, and the second side surface S8 is a convex surface; the second side surface S10 of the fifth lens L5 is a convex surface.

[0183] Table 14 shows the basic parameter table of the optical lens of Example 14, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0184] Table 14

[0185] Embodiment 15

[0186] The following reference Fig.15 The optical lens according to embodiment 15 of the present application is described. Fig.15As shown, the optical lens includes, from the first side to the second side along the optical axis: Compared with Example 1, the main differences between this embodiment and Example 1 are: the optical parameters such as the curvature radius of each lens surface and the lens thickness are different; and the third lens L3 has negative optical power, and its first side S5 is convex, and the second side S6 is concave; the first side S7 of the fourth lens L4 is convex, and the second side S8 is convex; the second side S10 of the fifth lens L5 is convex.

[0187] Table 15 shows the basic parameter table of the optical lens of Example 15, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0188] Table 15

[0189] Example 16

[0190] The following reference Fig.16 The optical lens according to Example 16 of the present application is described. Fig.16 As shown, the optical lens includes, from the first side to the second side along the optical axis: Compared with Example 1, the main differences between this embodiment and Example 1 are: the optical parameters such as the curvature radius of each lens surface and the lens thickness are different; and the third lens L3 has negative optical power, and its first side S5 is convex, and the second side S6 is concave; the first side S7 of the fourth lens L4 is convex, and the second side S8 is convex; the second side S10 of the fifth lens L5 is convex.

[0191] Table 16 shows the basic parameter table of the optical lens of Example 16, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0192] Table 16

[0193] Embodiment 17

[0194] The following reference Fig.17 The optical lens according to Example 17 of the present application is described. Fig.17 As shown, the optical lens includes, from the first side to the second side along the optical axis: Compared with Example 1, the main differences between this embodiment and Example 1 are: the optical parameters such as the curvature radius of each lens surface and the lens thickness are different; and the third lens L3 has negative optical power, and its first side S5 is convex, and the second side S6 is concave; the first side S7 of the fourth lens L4 is convex, and the second side S8 is convex.

[0195] Table 17 shows a basic parameter table of the optical lens of Example 17, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0196] Table 17

[0197] Embodiment 18

[0198] The following reference Fig.18 The optical lens according to Example 18 of the present application is described. Fig.18 As shown, the optical lens includes, from the first side to the second side along the optical axis: Compared with Example 1, the main differences between this embodiment and Example 1 are: the optical parameters such as the curvature radius of each lens surface and the lens thickness are different; and the third lens L3 has negative optical power, and its first side S5 is convex, and the second side S6 is concave; the first side S7 of the fourth lens L4 is convex, and the second side S8 is convex.

[0199] Table 18 shows the basic parameter table of the optical lens of Example 18, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0200] Table 18

[0201] Embodiment 19

[0202] The following reference Fig.19 The optical lens according to Example 19 of the present application is described. Fig.19 As shown, the main difference between this embodiment and Embodiment 1 is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0203] Table 19 shows the basic parameter table of the optical lens of Example 19, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0204] Table 19

[0205]

[0206] Tables 20-1, 20-2 and 20-3 give the basic parameters of the optical lenses in Examples 1-19, such as F, FOV, F1, F2, F3, F4, F5, D, H, BFL, TTL, β1, β2 and D10, wherein the units of F, FOV, F1, F2, F3, F4, F5, D, H, BFL, TTL and D10 are all millimeters (mm), and the units of β1 and β2 are degrees.

[0207] Table 20-1

[0208]

[0209] Table 20-2

[0210]

[0211] Table 20-3

[0212]

[0213] In summary, the conditional expressions of each embodiment in Embodiments 1 to 19 satisfy the relationships shown in Table 21-1, Table 21-2, and Table 21-3.

[0214] Table 21-1

[0215]

[0216] Table 21-2

[0217]

[0218] Table 21-3

[0219]

[0220] The present application also provides an electronic device, which includes the optical lens in the above exemplary embodiment and an imaging element for converting an optical image formed by the optical lens into an electrical signal, wherein the imaging element is arranged on the second side of the optical lens, for example, on the imaging surface, and may be, for example, a photosensitive coupling device (CCD) or a complementary metal oxide semiconductor device (CMOS). Light from the first side passes through the optical lens and forms an image on the second side.

[0221] The present application also provides an electronic device, which includes the optical lens and a light source in the above exemplary embodiment, wherein the light source is located on the second side of the optical lens. The light emitted by the light source is projected onto the first side of the optical lens after passing through the optical lens, and forms an image or illuminates an area on the first side.

[0222] 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 (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. An optical lens, characterized in that: The method comprises, in order from the first side to the second side along the optical axis: A first lens having negative optical power, wherein the first side surface is convex and the second side surface is concave; A second lens having negative optical power, wherein the second side surface of the second lens is concave; a third lens having positive or negative optical power, wherein the third lens is a meniscus lens; a fourth lens having positive refractive power; a fifth lens element having positive power, wherein the first side surface of the fifth lens element is convex; Wherein, the number of lenses having optical power in the optical lens is five; A curvature radius R5 of the first side surface of the third lens and a curvature radius R6 of the second side surface of the third lens satisfy: 0.6≤R5 / R6≤1.6; The air interval d45 between the fourth lens and the fifth lens on the optical axis and the total optical length TTL of the optical lens satisfy the following conditions: 0.05≤d45 / TTL≤0.3; The image height H corresponding to the maximum field angle of the optical lens, the total effective focal length F of the optical lens and the arc value θ of the maximum field angle of the optical lens satisfy: 0.45≤(H / 2) / (F×tan(θ / 2))≤0.75; The total optical length TTL of the optical lens and the total effective focal length F of the optical lens satisfy: 9.5≤TTL / F≤15.

2. The optical lens according to claim 1, characterized in that: The total optical length TTL of the optical lens, the image height H corresponding to the maximum field of view angle of the optical lens, and the maximum field of view angle FOV of the optical lens satisfy: 0.03≤TTL / H / FOV×1°≤0.

07.

3. The optical lens according to claim 1, characterized in that: The maximum light clearance aperture D of the first side surface of the first lens corresponding to the maximum field of view of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy: 0.01≤D / H / FOV×1°≤0.

03.

4. The optical lens according to claim 1, characterized in that: The total effective focal length F of the optical lens and the image height H corresponding to the maximum field angle of the optical lens satisfy the following: 0.3≤F / H≤0.

6.

5. The optical lens according to claim 1, characterized in that: The effective focal length F2 of the second lens and the total effective focal length F of the optical lens satisfy: -3.8≤F2 / F≤-1.

5.

6. The optical lens according to claim 1, characterized in that: The effective focal length F3 of the third lens and the total effective focal length F of the optical lens satisfy: 3≤|F3 / F|≤45.

7. The optical lens according to claim 1, characterized in that: The effective focal length F5 of the fifth lens and the total effective focal length F of the optical lens satisfy: 3.5≤F5 / F≤6.

5.

8. The optical lens according to claim 1, characterized in that: The radius of curvature R9 of the first side surface of the fifth lens and the total effective focal length F of the optical lens satisfy: 2.5≤R9 / F≤7.

9. The optical lens according to claim 1, characterized in that: The maximum light clearance diameter D of the first side surface of the first lens corresponding to the maximum field angle of the optical lens and the maximum light clearance diameter D10 of the second side surface of the fifth lens corresponding to the maximum field angle of the optical lens satisfy: 1<D / D10≤1.

6.

10. The optical lens according to claim 1, characterized in that: The angle β1 formed by the maximum field of view FOV of the optical lens and the principal ray of the edge field of view and the first virtual surface located between the second side surface of the second lens and the first side surface of the third lens satisfies: 1.5≤(FOV / 2) / β1≤4.

2.

11. The optical lens according to claim 1, characterized in that: An angle β2 formed by the chief ray of the edge field of view and a second virtual surface located between the second side surface of the third lens and the first side surface of the fourth lens satisfies the maximum field of view angle FOV of the optical lens: 0.2≤β2 / (FOV / 2)≤0.

4.

12. The optical lens according to claim 1, characterized in that: A curvature radius R2 of the second side surface of the first lens, a curvature radius R1 of the first side surface of the first lens, and a center thickness d1 of the first lens on the optical axis satisfy: 1.3≤R2 / (R1+d1)≤2.

2.

13. The optical lens according to any one of claims 1 to 12, characterized in that: The optical lens satisfies at least one of the following conditions: 1.4≤D10 / H≤2; 56°≤(FOV×F) / H≤62°; -6≤F1 / F≤-1.8; 1.5≤F4 / F≤13; 2.5≤R1 / F≤4.5; 0.6≤R2 / F≤2.5 ;0.5≤R4 / F≤3; 0.2≤|R5| / (|R6|+d5)≤1.3; 0.12≤d45 / TTL≤0.28; 0.14≤BFL / TTL≤0.22; |R7 / F|≥5; Among them, D10 is the maximum clear aperture of the second side surface of the fifth lens corresponding to the maximum field of view of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, FOV is the maximum field of view of the optical lens, F is the total effective focal length of the optical lens, F1 is the effective focal length of the first lens, F4 is the effective focal length of the fourth 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, R4 is the radius of curvature of the second side surface of the second lens, R5 is the radius of curvature of the first side surface of the third lens, R6 is the radius of curvature of the second side surface of the third lens, d5 is the center thickness of the third lens on the optical axis, d45 is the air spacing between the fourth lens and the fifth lens on the optical axis, TTL is the total optical length of the optical lens, BFL is the back focal length of the optical lens, and R7 is the radius of curvature of the first side surface of the fourth lens.

14. The optical lens according to any one of claims 1 to 12, characterized in that: The first side surface of the second lens is a convex surface or a concave surface.

15. The optical lens according to any one of claims 1 to 12, characterized in that: The first side surface of the fourth lens is a plane surface, and the second side surface is a convex surface; or, The first side surface of the fourth lens is a convex surface, and the second side surface is a convex surface; or, The first side surface of the fourth lens is a concave surface, and the second side surface is a convex surface; or, The first side surface of the fourth lens is a convex surface, and the second side surface is a concave surface.

16. The optical lens according to any one of claims 1 to 12, characterized in that: The second side surface of the fifth lens is a convex surface or a concave surface.

17. The optical lens according to any one of claims 1 to 12, characterized in that: The optical lens satisfies at least one of the following conditions: 0.16≤BFL / TTL≤0.2; 1.5≤D10 / H≤1.85; 0.04≤TTL / H / FOV×1°≤0.06; 0.015≤D / H / FOV×1°≤0 .025; 58°≤(FOV×F) / H≤60°; 0.4≤F / H≤0.55; -5≤F1 / F≤-2.5; -3.2≤F2 / F≤-2; 5≤|F3 / F|≤40; 2.5≤F4 / F≤9.5; 4≤F5 / F≤6; 2.8≤R1 / F≤4.2; 1≤R2 / F≤2; 0.8≤R4 / F≤2; 3.5≤R9 / F≤6.2; 0.9≤R5 / R6≤1.5; 0.45≤|R5| / (|R6|+d5)≤1.05; 1.1≤D / D10≤1.42; 0.55≤(H / 2) / (F×tan(θ / 2))≤0.65; 2≤(FOV / 2) / β1≤3.7; 0.26≤β2 / (FOV / 2)≤0.36; 0.15≤d45 / TTL≤0.25; 1.5≤R2 / (R1+d1)≤2; 10.8≤TTL / F≤14.1; |R7 / F|≥6.5; Wherein, BFL is the back focal length of the optical lens, TTL is the total optical length of the optical lens, D10 is the maximum clear aperture of the second side of the fifth lens corresponding to the maximum field of view of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, FOV is the maximum field of view of the optical lens, D is the maximum clear aperture of the first side of the first lens corresponding to the maximum field of view of the optical lens, F is the total effective focal length of the optical lens, F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, F3 is the effective focal length of the third lens, F4 is the effective focal length of the fourth lens, F5 is the effective focal length of the fifth lens, R1 is the curvature radius of the first side of the first lens, R2 is the curvature radius of the second side of the first lens, and R4 is the curvature radius of the second The radius of curvature of the second side surface of the lens, R9 is the radius of curvature of the first side surface of the fifth lens, R5 is the radius of curvature of the first side surface of the third lens, R6 is the radius of curvature of the second side surface of the third lens, d5 is the center thickness of the third lens on the optical axis, θ is the radian value of the maximum field of view angle of the optical lens, β1 is the angle formed by the edge field of view chief ray and the first virtual surface located between the second side surface of the second lens and the first side surface of the third lens, β2 is the angle formed by the edge field of view chief ray and the second virtual surface located between the second side surface of the third lens and the first side surface of the fourth lens, d45 is the air interval between the fourth lens and the fifth lens on the optical axis, d1 is the center thickness of the first lens on the optical axis, and R7 is the radius of curvature of the first side surface of the fourth lens.

18. An electronic device, characterized in that: The electronic device comprises the optical lens according to any one of claims 1 to 17, and further comprises an imaging element or a light source, wherein the imaging element is used to convert an optical image or optical information formed by the optical lens into an electrical signal; Wherein, the imaging element is located on the second side of the optical lens, and the light from the first side is imaged on the second side after passing through the optical lens; The light source is located on the second side of the optical lens, and the light emitted by the light source is projected to the first side of the optical lens after passing through the optical lens, and forms an image or illuminates an area on the first side.

Images