Optical lenses and electronic equipment

Abstract

The present application discloses an optical lens and an electronic device. The optical lens includes five lenses with optical power in sequence from the first side to the second side along the optical axis: a first lens with positive optical power; a second lens with positive optical power, whose first side surface is convex and the second side surface is concave; a third lens with negative optical power; a fourth lens with positive optical power, whose first side surface is concave and the second side surface is convex; and a fifth lens with positive optical power; the optical lens satisfies: 0.03≤BFL / TTL≤0.3, 0.24≤R3 / (R4+d2)≤0.9, ‑7≤R7 / (d4+d5+t45+BFL)≤‑0.5. The optical lens disclosed in the present application can achieve at least one technical effect of high resolution, weak ghost image, miniaturization and small FNO.

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 progress of science and technology and the continuous development of society, the market has higher and higher requirements for optical lenses used in various scenarios, especially optical lenses used in LiDAR. In the automotive automatic driving assistance system, LiDAR lenses are key components for detecting information around the car. However, the lenses in related technologies have the following problems and cannot meet market demand:

[0003] 1) Due to the high safety requirements of automobile driving assistance systems, in order to detect signals more accurately, the image quality is usually improved by increasing the number of lenses in the lens, which makes the lens larger and more expensive; 2) It is difficult to meet the requirements of miniaturization and low ghost images at the same time; 3) It is impossible to take into account both miniaturization and high resolution. Summary of the invention

[0004] In one aspect of the present application, an optical lens is provided, which includes five lenses with optical power in sequence from a first side to a second side along an optical axis: a first lens with positive optical power; a second lens with positive optical power, whose first side surface is convex and whose second side surface is concave; a third lens with negative optical power; a fourth lens with positive optical power, whose first side surface is concave and whose second side surface is convex; and a fifth lens with positive optical power; the optical lens satisfies: 0.03≤BFL / TTL≤0.3, 0.24≤R3 / (R4+ d2)≤0.9, -7≤R7 / (d4+d5+t45+BFL)≤-0.5, wherein BFL is the optical back focus of the optical lens, TTL is the total optical length of the optical lens, R3 is the radius of curvature of the first side surface of the second lens, R4 is the radius of curvature of the second side surface of the second lens, R7 is the radius of curvature of the first side surface of the fourth lens, d2 is the center thickness of the second lens, d4 is the center thickness of the fourth lens, d5 is the center thickness of the fifth lens, and t45 is the distance between the fourth lens and the fifth lens along the optical axis. By setting the lens in this way, i.e., setting the second lens to be a convex and concave meniscus shape, and reasonably controlling the radius of curvature of the first side surface and the second side surface of the second lens and their center thickness, the second lens receives the light passing through the first lens and converges smoothly to the third lens, which is conducive to reducing sensitivity and improving imaging quality. Furthermore, in cooperation with the first lens with positive focal length, the front large-diameter light can quickly enter the rear optical system, which is conducive to ensuring the system light flux, while shortening the back focus, and is conducive to miniaturization of the lens. At the same time, by controlling the first side of the fourth lens to be a concave surface, receiving the divergent light of the third lens and making a smooth transition, the distance from the first side of the fourth lens to the imaging surface on the optical axis is appropriately increased, which is conducive to the rear lens to smoothly converge the light to the imaging surface, thereby reducing sensitivity and improving resolution. Moreover, when the radius of curvature of the first side of the fourth lens remains unchanged, appropriately increasing the distance from the first side of the fourth lens to the imaging surface on the optical axis can extend the optical path of the reflected light from the image plane, converge the even reflection focus outside the imaging surface, and also help to reduce ghost images. Therefore, an optical lens that meets the above three conditions at the same time can achieve at least one of the technical effects of high resolution, weak ghost images, miniaturization and small FNO, so that the optical lens can better meet the high requirements of, for example, vehicle-mounted applications. Another aspect of the present application provides an electronic device, including an optical lens of any of the above embodiments, and including an imaging element for converting an optical image formed by the optical lens into an electrical signal, or including a light source. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] Other features, purposes and advantages of the present application will become more apparent through the following detailed description of the embodiments in conjunction with the accompanying drawings. In the accompanying drawings:

[0006] Figures 1 to 16Schematic diagrams of the structures of optical lenses according to Embodiments 1 to 16 of the present application are respectively shown; and

[0007] Figures 17 to 22 Schematic diagrams of MTF curves of optical lenses according to Embodiment 1, Embodiment 2, Embodiment 7, Embodiment 8, Embodiment 13 and Embodiment 14 of the present application are respectively shown. DETAILED DESCRIPTION

[0008] 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.

[0009] 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.

[0010] 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.

[0011] 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, the surface of each lens closest to the second side is called the second side surface of the lens, and the surface of the optical lens closest to the second side is called the second side surface of the optical lens.

[0012] It should be understood that the optical lens provided in this application can be used for both video and projection, and can also be used for laser radar lenses. When the optical lens provided in this application is used for a video lens or a laser radar receiving end lens, the video lens can be, for example, a vehicle-mounted camera, an infrared camera, a drone camera, a night vision camera, a security monitoring camera, etc., and the "first side" involved in this article can refer to the object side, and the "second side" can refer to the image side, and the light from the object side can be imaged on the image side; when the optical lens provided in this application is used for a projection lens or a radar transmitting end lens, the "first side" involved in this article can refer to the object side, and the "second side" can refer to the light source side, and the light from the light source side is projected to the first side after passing through the optical lens, and forms an image or illuminates the area on the first side.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] The features, principles and other aspects of the present application are described in detail below.

[0017] In an exemplary embodiment, the optical lens includes, for example, five lenses having optical power, namely, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, which are arranged in sequence from the first side to the second side along the optical axis.

[0018] 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. The second side of the optical lens can be provided with an imaging surface of the optical lens.

[0019] In an exemplary embodiment, the optical lens provided in the present application can be used as, for example, a projection lens or a laser radar transmitting end lens, in which case the first side of the optical lens can be the object side, and the second side can be the light source side. Light from the light source side passes through the optical lens and is projected to the object side, and forms an image or illuminates an area on the object side, and the second side of the optical lens can be provided with a light source surface of the optical lens.

[0020] 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 photosensitive coupled device (CCd) or a complementary metal oxide semiconductor device (CMOS).

[0021] In an exemplary embodiment, an aperture for limiting the light beam may be provided between the first lens and the second lens to further improve the imaging quality of the optical lens. The aperture is conducive to converging the light entering the optical system, balancing the aperture size of the lenses in the front and rear optical systems, and can achieve a small FNO of the optical lens while smoothing the light trend. 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 set at other positions according to actual needs.

[0022] In an exemplary embodiment, the first lens may have positive power, and its first side surface may be convex, and its second side surface may be convex. The first lens has positive power, which can converge light and is conducive to collecting field light into the optical system. The first side surface is convex, which can collect as much light as possible to enter the rear optical system. The second side surface is convex, which can make the light quickly transition to the rear optical system and reduce the system aperture.

[0023] In an exemplary embodiment, the first lens may have positive power, and its first side surface may be concave, and its second side surface may be convex. The first lens has positive power, which can converge light and is conducive to collecting field light into the optical system. The first side surface is concave, which can diverge light. The second side surface is convex, and the shape of the first lens is meniscus, which can make the light converge to the second lens as smoothly as possible, which is conducive to achieving low sensitivity and small front end diameter of the system.

[0024] In an exemplary embodiment, the first lens may have positive power, and its first side surface may be convex and its second side surface may be concave. The first lens may have positive power to converge light, which is beneficial to collecting field light to enter the optical system. The first side surface is convex, which can collect as much light as possible to enter the rear optical system. The second side surface is concave, which can make the light enter the rear optical system as smoothly as possible, which is beneficial to achieve low sensitivity and small front-end diameter of the system.

[0025] In an exemplary embodiment, the second lens may have positive focal power, and its first side surface may be convex, and its second side surface may be concave. The second lens has positive focal power, which can converge light, and cooperate with the first lens, so that the light can be smoothly converged and compressed to the rear optical system, which is conducive to achieving high light transmission and improving resolution. The first side surface is convex, which is conducive to receiving the light emitted by the first lens and converging the light incident on the first lens, and can also correct the axial aberration of the incident light. The second side surface is concave, which can make the light enter the rear optical system as smoothly as possible, which is conducive to reducing the light sensitivity and reducing the pressure of the rear optical system to improve the resolution. In this embodiment, one side surface of the second lens is convex and the other side surface is concave, which can make the light passing through the first lens to the third lens transition smoothly, which is conducive to reducing the system sensitivity, improving the resolution ability, and having good processability. In an exemplary embodiment, the second lens can be meniscus-shaped as a whole, so that the second lens shape is meniscus-shaped, and cooperates with the first lens, so that the light of the front optical system can quickly enter the rear optical system, shorten the back focus, and is conducive to the miniaturization of the optical lens.

[0026] In an exemplary embodiment, the third lens may have a negative optical power, and its first side surface may be a convex surface, and its second side surface may be a concave surface. The third lens has a negative optical power, which can diverge light and can receive the light emitted by the second lens and transition to the rear optical system. In an exemplary embodiment, the third lens may be in a meniscus shape as a whole, so that the light collected by the front optical system is appropriately diverged, which is conducive to reducing light sensitivity and improving system resolution.

[0027] In an exemplary embodiment, the third lens may have a negative optical power, and its first side surface may be a concave surface, and its second side surface may be a concave surface. The third lens has a negative optical power, which can diverge light and can receive the light emitted by the second lens and transition to the rear optical system. The first side surface and the second side surface are both concave, which is conducive to collecting the light passing through the front optical system and diffusing the light to the rear optical system, balancing the optical power of the first and second sides of the third lens, and can diverge the light diverged by the first side surface of the third lens to the fourth lens again, playing a role in smoothing the transition of light, reducing system sensitivity, and at the same time reducing the pressure of the rear optical system to correct aberrations.

[0028] In an exemplary embodiment, the third lens may have a negative optical power, and its first side surface may be a concave surface, and its second side surface may be a convex surface. The third lens has a negative optical power, which can diverge light and can receive the light emitted by the second lens and transition to the rear optical system. In an exemplary embodiment, the third lens may be in a meniscus shape as a whole. The first side surface is concave, the second side surface is convex, and the shape is a meniscus, which can make the light collected by the front optical system appropriately diverge, which is conducive to reducing light sensitivity and improving system resolution.

[0029] In an exemplary embodiment, the fourth lens may have positive focal power, and its first side surface may be concave, and its second side surface may be convex. The fourth lens has positive focal power, which can converge light, receive divergent light emitted by the third lens, and converge the light to the rear optical system. The first side surface is concave, which is conducive to proper diffusion of light, and can collect divergent light from the third lens, increase the amount of light entering, reduce the deflection of light, and reduce light sensitivity. The second side surface is convex, which can make the light converge to the fifth lens to a certain extent, reducing the total length of the system. In an exemplary implementation, the fourth lens can be meniscus-shaped as a whole. Since the fourth lens plays the role of receiving the front and rear optical systems in the entire system, the shape of the fourth lens is meniscus-shaped, which can make the light entering from the front optical system deflected at a smaller angle, so as to better correct the aberration while ensuring the low sensitivity of the system and improve the resolution. In an exemplary embodiment, the second side surface of the second lens is concave, which cooperates with the fourth lens whose first side surface is concave, which is conducive to correcting off-axis aberrations and improving resolution.

[0030] In an exemplary embodiment, the fifth lens may have positive focal power, and its first side surface may be convex, and its second side surface may be convex. The fifth lens has positive focal power, which can converge light, receive light from the fourth lens, and further converge the light to the imaging surface, shorten the distance to the imaging surface, achieve miniaturization, reduce light loss, and improve imaging quality. The first side surface and the second side surface of the fifth lens are both convex, which can quickly and smoothly converge the light passing through the fourth lens to the imaging surface, so that the light is converged twice, and after passing through the second side surface of the fifth lens, the edge light is deflected toward the optical axis, which helps to shorten the physical distance that the light passes, reduce the total length of the optical system, and facilitate miniaturization. In this embodiment, the fifth lens cooperates with the fourth lens to make the light beam converge smoothly to the imaging surface, which is conducive to miniaturization of the optical lens while ensuring the resolution of the optical system.

[0031] In an exemplary embodiment, the fifth lens may have positive focal power, and its first side surface may be a concave surface, and its second side surface may be a convex surface. The fifth lens has positive focal power, which can converge light, receive light from the fourth lens, and further converge the light to the imaging surface, shorten the distance to the imaging surface, achieve miniaturization, reduce light loss, and improve imaging quality. In an exemplary embodiment, the surface shape of the first side surface of the fifth lens is relatively flat, so that the first side surface of the fifth lens is concave, which can receive light from the fourth lens and allow the light to smoothly reach the second side surface of the fifth lens. The second side surface is a convex surface, which can converge light, so that the light entering the second side surface of the fifth lens is deflected at a smaller angle, which is conducive to miniaturization and improving imaging quality. In this embodiment, the fifth lens cooperates with the fourth lens to deflect the light entering through the front optical system at a smaller angle, which can achieve better correction of aberrations while ensuring the low sensitivity of the system and improving resolution.

[0032] In an exemplary embodiment, the fifth lens may have positive focal power, and its first side may be convex and its second side may be concave. The fifth lens has positive focal power, and can receive light from the fourth lens, and further converge and adjust the light, shorten the distance from the light to the imaging surface, achieve miniaturization, reduce light loss, and improve imaging quality. The first side is convex, which can converge the incident light transmitted by the front optical system, so that the light quickly reaches the imaging surface, which helps to achieve a short total optical length of the optical system. The second side is concave, which can further diverge the central light, so that the light can reach a higher imaging position, so that the incident angle of the light entering the chip is reduced, which helps to improve the illumination and reduce aberrations. In this embodiment, the fifth lens cooperates with the fourth lens to deflect the light entering through the front optical system at a smaller angle, which can achieve better correction of aberrations while ensuring the low sensitivity of the system and improving the resolution.

[0033] Figure 1 The optical lens provided in this application can be used as, for example, a vehicle-mounted lens or a laser radar receiving end lens. Figure 1 IMA represents an imaging surface, and light from an object passes through each surface S1 to S10 in sequence and is finally imaged on the imaging surface arranged on the second side, wherein an image sensor chip is arranged on the imaging surface. It should be understood that the optical lens provided in the present application can also be used as, for example, a projection lens or a laser radar transmitting end lens. In this case, Figure 1 Here, IMA represents a light source surface, and light from the light source surface passes through the surfaces S10 to S1 in sequence and is finally projected to the first side, and forms an image or an illuminated area on the first side.

[0034] In the present application, 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, TTL is the total optical length of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, FOV is the maximum field of view of the optical lens, D is the maximum light clearance diameter of the first side surface of the first lens corresponding to the maximum field of view of the optical lens, D10 is the maximum light clearance diameter of the second side surface of the fifth lens corresponding to the maximum field of view of the optical lens, B is the maximum light clearance diameter of the first side surface of the fifth lens corresponding to the maximum field of view of the optical lens, and FL is the optical back focus of the optical lens, R3 is the curvature radius of the first side surface of the second lens, R4 is the curvature radius of the second side surface of the second lens, R7 is the curvature radius of the first side surface of the fourth lens, R8 is the curvature radius of the second side surface of the fourth lens, d2 is the center thickness of the second lens, d4 is the center thickness of the fourth lens, d5 is the center thickness of the fifth lens, t12 is the spacing distance between the first lens and the second lens along the optical axis, t45 is the spacing distance between the fourth lens and the fifth lens along the optical axis, and θ is the radian value corresponding to the maximum field angle of the optical lens. The above meanings will not be repeated below.

[0035] In an exemplary embodiment, the optical lens may satisfy: TTL / F≤2.5. By making the optical lens satisfy the above conditional formula and controlling the ratio of the total optical length to the total effective focal length of the optical lens, a longer focal length and miniaturization of the optical lens can be achieved. Preferably, the optical lens may further satisfy: 1≤TTL / F≤2 to achieve miniaturization of the optical lens. Preferably, the optical lens may further satisfy: 1.2≤TTL / F≤1.7 to achieve miniaturization of the optical lens.

[0036] In an exemplary embodiment, the optical lens may satisfy: 0.06≤TTL / H / FOVx1°≤0.15. By making the optical lens satisfy the above conditional formula, the length of the lens can be effectively limited when the ratio of image height to field of view is constant, which is conducive to miniaturization of the optical lens. Preferably, the optical lens may further satisfy: 0.09≤TTL / H / FOVx1°≤0.13, thereby miniaturizing the optical lens.

[0037] In an exemplary embodiment, the optical lens may satisfy: 0.03≤BFL / TTL≤0.3. By making the optical lens satisfy the above conditional formula, it is possible to reserve space for the installation and focusing of optical elements on the basis of miniaturization, and avoid interference between mechanical components. Preferably, the optical lens may further satisfy: 0.06≤BFL / TTL≤0.23, so as to achieve miniaturization of the optical lens.

[0038] In an exemplary embodiment, the optical lens may satisfy: 0.02≤D / H / FOVx1°≤0.1. By making the optical lens satisfy the above conditional formula and controlling the ratio of the maximum aperture, image height and maximum field angle of the first side of the first lens, the miniaturization and large image surface of the optical lens can be achieved. Preferably, the optical lens may further satisfy: 0.03≤D / H / FOVx1°≤0.07, so as to achieve a small aperture of the optical lens.

[0039] In an exemplary embodiment, the optical lens may satisfy: 0.01 mm -1 ≤D / H / F≤0.1mm -1 By making the optical lens satisfy the above conditional formula, the maximum aperture and image height of the first side of the first lens can be controlled under the condition of a certain total effective focal length, so as to provide the optical lens with the characteristics of large image height and small aperture. Preferably, the optical lens can further satisfy: 0.02mm -1 ≤D / H / F≤0.07mm -1 , to achieve a small aperture of the optical lens. Preferably, the optical lens can further meet: 0.03mm -1 ≤D / H / F≤0.06mm -1 , to achieve a small aperture of the optical lens.

[0040] In an exemplary embodiment, the optical lens may satisfy: 0.4 rad ≤ (F*θ) / D ≤ 1 rad. By making the optical lens satisfy the above conditional expression, the aperture of the front end of the optical lens can be made small, thereby reducing the volume of the imaging system of the optical lens. Preferably, the optical lens may further satisfy: 0.5 rad ≤ (F θ) / D≤0.92rad, realizing the small aperture of the optical lens.

[0041] In an exemplary embodiment, the optical lens may satisfy: 0.4≤F1 / F≤3. By making the optical lens satisfy the above conditional formula, the first lens is controlled to have positive focal power and a larger effective focal length value, which is beneficial to collecting light and making the light smoothly transition into the rear optical system, thereby helping to reduce light sensitivity and improve resolution. Preferably, the optical lens may further satisfy: 1≤F1 / F≤2.6 to achieve high resolution of the optical lens. In an exemplary embodiment, the optical lens simultaneously satisfies that the first lens is a concave-convex shape and the conditional formula 2.2≤F1 / F≤2.8, or simultaneously satisfies that the first lens is a convex-concave or convex-convex shape and the conditional formula 1≤F1 / F≤1.9, or simultaneously satisfies that the first lens is a convex-concave shape and the conditional formula 1≤F1 / F≤1.4, which is more conducive to achieving high imaging quality of the optical lens.

[0042] In an exemplary embodiment, the optical lens may satisfy: 0.5≤F2 / F≤8.5. By making the optical lens satisfy the above conditional formula, the second lens is controlled to have positive focal power and a large effective focal length value, and cooperates with the first lens to smoothly converge the light of the front optical system to the third lens, which is conducive to reducing light sensitivity and improving resolution. Preferably, the optical lens may further satisfy: 1≤F2 / F≤6, so as to achieve high resolution of the optical lens.

[0043] In an exemplary embodiment, the optical lens can satisfy: -1.5≤F3 / F≤-0.2. By making the optical lens satisfy the above conditional formula, the third lens is controlled to have negative focal power and a small effective focal length. In cooperation with the first lens and the second lens, it can receive the converged light through the front optical system and diverge the light, so that the deflection angle of the light emitted from the third lens is small, thereby achieving a smooth transition of the light to the fourth lens, which is beneficial to reducing light sensitivity and improving resolution. In addition, reasonable control of the effective focal length of the third lens is beneficial to balancing the aperture of the front and rear ends of the lens and achieving miniaturization. Preferably, the optical lens can further satisfy: -1.1≤F3 / F≤-0.4, achieving high resolution of the optical lens. In an exemplary embodiment, the optical lens simultaneously satisfies the concave-convex shape of the first lens and the conditional formula -1.2≤F3 / F≤-0.8, which is more conducive to a smooth light trend, reducing sensitivity, improving resolution and balancing the front and rear port diameters of the lens.

[0044] In an exemplary embodiment, the optical lens may satisfy: 0.6≤F4 / F≤4.2. By making the optical lens satisfy the above conditional formula, the fourth lens is controlled to have positive focal power and a larger effective focal length value, so that the fourth lens receives and converges the divergent light from the third lens, which can make the light deflection angle smaller, thereby achieving a smooth transition of the light to the fifth lens, which is beneficial to improving the resolution. Preferably, the optical lens may further satisfy: 1≤F4 / F≤3.2, to achieve high resolution of the optical lens. In an exemplary embodiment, the optical lens simultaneously satisfies the first lens being a convex-convex shape, the third lens being a convex-concave shape and the conditional formula 2.8≤F4 / F≤3.5, and the effective focal length value of the fourth lens can be appropriately increased, which is beneficial to a better resolution effect of the optical lens.

[0045] In an exemplary embodiment, the optical lens may satisfy: 0.4≤F5 / F≤2.3. By making the optical lens satisfy the above conditional formula, controlling the fifth lens to have positive focal power, and reasonably controlling the focal length of the fifth lens, the light of the front optical system can be further converged to the imaging surface, which is conducive to correcting aberrations and improving resolution. Preferably, the optical lens may further satisfy: 0.8≤F5 / F≤1.8, achieving high resolution of the optical lens.

[0046] In an exemplary embodiment, the optical lens may satisfy: 0.15≤R3 / TTL≤1. In an exemplary embodiment, the first side surface of the second lens is a convex surface. By making the optical lens satisfy the above conditional formula, the radius of curvature of the first side surface of the second lens is controlled to be relatively small, so that the first side surface of the second lens can receive light from the front optical system and quickly converge the light to the imaging surface, which is conducive to reducing the total optical length of the optical lens. Preferably, the optical lens may further satisfy: 0.35≤R3 / TTL≤0.7, so as to realize the miniaturization of the optical lens.

[0047] In an exemplary embodiment, the optical lens may satisfy: 0.2≤R4 / TTL≤1.5. In an exemplary embodiment, the second side surface of the second lens is a concave surface. By making the optical lens satisfy the above conditional formula and rationally controlling the radius of curvature of the second side surface of the second lens, the convergent light from the front optical system can be quickly diverged to the third lens, which is conducive to the smooth transition of the light to the third lens. Preferably, the optical lens may further satisfy: 0.6≤R4 / TTL≤1.2, so as to achieve high resolution of the optical lens.

[0048] In an exemplary embodiment, the optical lens may satisfy: -3≤R7 / TTL≤-0.3. In an exemplary embodiment, the first side surface of the fourth lens is a concave surface. By making the optical lens satisfy the above conditional formula and rationally controlling the radius of curvature of the first side surface of the fourth lens, as many large-angle light rays emitted from the third lens as possible can be collected, which is beneficial to increase the amount of light entering. Preferably, the optical lens may further satisfy: -1.6≤R7 / TTL≤-0.7, so as to achieve high luminous flux and / or high resolution of the optical lens. In an exemplary embodiment, the optical lens simultaneously satisfies the conditional formulas -3≤R7 / TTL≤-0.3 and 0.2≤R4 / TTL≤1.5, so that the second side surface of the second lens and the first side surface of the fourth lens can be a symmetrical structure, thereby being able to correct off-axis aberrations, which is beneficial to improving resolution. Preferably, further satisfying -1.6≤R7 / TTL≤-0.7 and / or 0.6≤R4 / TTL≤1.2 is more beneficial to improving resolution.

[0049] In an exemplary embodiment, the optical lens may satisfy: -0.9≤R8 / TTL≤-0.1. In an exemplary embodiment, the second side surface of the fourth lens is a convex surface. By making the optical lens satisfy the above conditional formula, the radius of curvature of the second side surface of the fourth lens is controlled to be smaller, and the divergent light passing through the first side surface of the fourth lens can be quickly converged, which is conducive to reducing the total length of the system. Preferably, the optical lens may further satisfy: -0.6≤R8 / TTL≤-0.35, so as to realize the miniaturization of the optical lens.

[0050] In an exemplary embodiment, the optical lens may satisfy: |(H / 2-F θ / 2) / (F θ / 2)|≤0.1. By making the optical lens satisfy the above conditional formula, it is possible to achieve a small difference between the ideal image height and the actual image height corresponding to the maximum field of view of the optical lens under a certain field of view angle, thereby reducing lens distortion. Preferably, the optical lens can further satisfy: 0.03≤|(H / 2-F θ / 2) / (F θ / 2)|≤0.09, achieving small distortion of the optical lens.

[0051] In an exemplary embodiment, the optical lens may satisfy: 0.24≤R3 / (R4+d2)≤0.9. In an exemplary embodiment, the second lens is meniscus-shaped as a whole. By making the optical lens satisfy the above conditional formula and rationally controlling the radius of curvature and the center thickness of the second lens, the second lens can receive the light passing through the first lens and smoothly converge the light to the third lens, which is beneficial to reduce sensitivity and improve resolution. Moreover, in this embodiment, the second lens cooperates with the first lens to enable the large-aperture light at the front end to quickly enter the rear optical system, which is beneficial to ensure the system luminous flux, shorten the back focus, and facilitate the miniaturization of the lens. Preferably, the optical lens can further satisfy: 0.35≤R3 / (R4+d2)≤0.7, so as to achieve high resolution of the optical lens.

[0052] In an exemplary embodiment, the optical lens can satisfy: -7≤R7 / (d4+d5+t45+BFL)≤-0.5. In an exemplary embodiment, by controlling the first side surface of the fourth lens to be a concave surface, the divergent light of the third lens is received and smoothly transitioned, and the distance from the first side surface of the fourth lens to the imaging surface on the optical axis is appropriately increased, which is conducive to the rear lens to smoothly converge the light to the imaging surface, thereby reducing sensitivity and improving resolution. Moreover, when the radius of curvature of the first side surface of the fourth lens remains unchanged, the distance from the first side surface of the fourth lens to the imaging surface on the optical axis is appropriately enlarged, which is enough to extend the optical path of the reflected light from the image plane, converge the even reflection focus outside the image plane, and also help to reduce ghost images. If the lower limit of this conditional expression is exceeded, even if the first side surface of the fourth lens is relatively flat, it is not conducive to achieving high light flux and high imaging quality; if the upper limit of this conditional expression is exceeded, it is not conducive to miniaturization, so such a range is set. The optical lens can further satisfy: -4.5≤R7 / (d4+d5+t45+BFL)≤-0.1, so as to realize high resolution and miniaturization of the optical lens. Preferably, the optical lens can further satisfy: -3.5≤R7 / (d4+d5+t45+BFL)≤-1.4, so as to realize high resolution and miniaturization of the optical lens.

[0053] In an exemplary embodiment, the optical lens may satisfy: -1.4≤R4 / R7<0. By making the optical lens satisfy the above conditional formula, the second side surface of the second lens and the first side surface of the fourth lens are symmetrical structures, thereby correcting the off-axis aberration, which is beneficial to improving the resolution. Preferably, the optical lens may further satisfy: -1≤R4 / R7≤-0.7, so as to achieve high resolution of the optical lens.

[0054] In an exemplary embodiment, the optical lens may satisfy: -1.5≤(1 / F1+1 / F2+1 / F3) / (1 / F)≤-0.1. In an exemplary embodiment, the first lens, the second lens, and the third lens may be combined so that the combined lens group of the first lens, the second lens, and the third lens has a negative optical focal length and can diverge light. By making the optical lens satisfy the above conditional formula and controlling the optical focal length of the combined lens group within a reasonable range, it is possible to collect field light and make the light smoothly transition to the lens group composed of the fourth lens and the fifth lens and converge, which is beneficial to reduce sensitivity and improve resolution. Preferably, the optical lens may further satisfy: -0.9≤(1 / F1+1 / F2+1 / F3) / (1 / F)≤-0.14, thereby achieving high resolution of the optical lens.

[0055] In an exemplary embodiment, the optical lens may satisfy: -1.2≤(1 / F1+1 / F2) / (1 / F3)≤-0.3. In an exemplary embodiment, the first lens and the second lens may be combined so that the combined lens group of the first lens and the second lens has a positive optical focal length and can converge light; the third lens may have a negative optical focal length and has a function of diverging light. By making the optical lens satisfy the above conditional formula and controlling the ratio between the optical focal length of the combined lens group formed by the combination of the first lens and the second lens and the optical focal length of the third lens, the first lens, the second lens and the third lens as a whole can have the function of diverging light, thereby enabling the light to be emitted to the rear optical system as much as possible, which is beneficial to increase the amount of light entering. Preferably, the optical lens may further satisfy: -1≤(1 / F1+1 / F2) / (1 / F3)≤-0.5, so as to achieve a high luminous flux of the optical lens.

[0056] In an exemplary embodiment, the optical lens may satisfy: 0.2≤R3 / R4≤1.5. In an exemplary embodiment, the second lens may be meniscus-shaped as a whole. By making the optical lens satisfy the above-mentioned conditional formula, rationally controlling the ratio between the radius of curvature of the first side surface and the second side surface of the second lens, and cooperating with the first lens, the light can be smoothly converged to the third lens, which is beneficial to reduce sensitivity and improve resolution. In addition, making the radius of curvature of the first side surface and the second side surface of the second lens not differ much is beneficial to make the light smoothly transition from the first lens to the third lens, which is further beneficial to reduce sensitivity and improve resolution. Preferably, the optical lens may further satisfy: 0.3≤R3 / R4≤1.3, so as to achieve low sensitivity and high resolution of the optical lens. Preferably, the optical lens may further satisfy: 0.4≤R3 / R4≤1, so as to achieve low sensitivity and high resolution of the optical lens.

[0057] In an exemplary embodiment, the optical lens may satisfy: 0.08≤d2 / TTL≤0.18. By making the optical lens satisfy the above conditional formula and appropriately increasing the center thickness of the second lens, it is beneficial to increase the optical path, effectively converge the light incident from the front optical system, smooth the light trend, reduce the system sensitivity, and also ensure miniaturization. Preferably, the optical lens may further satisfy: 0.1≤d2 / TTL≤0.15, to achieve low sensitivity of the optical lens.

[0058] In an exemplary embodiment, the optical lens may satisfy: |(H-D10) / BFL|≤0.7. By making the optical lens satisfy the above conditional formula, the maximum aperture corresponding to the maximum field angle of the second side of the last lens (i.e., the fifth lens) of the optical lens is close to the image height, which can reduce the light deflection and facilitate the realization of a small CRA. Preferably, the optical lens may further satisfy: |(H-D10) / BFL|≤0.55 to achieve a small CRA of the optical lens. Preferably, the optical lens may further satisfy: 0.02≤|(H-D10) / BFL|≤0.35 to achieve a small CRA of the optical lens.

[0059] In an exemplary embodiment, the optical lens may satisfy: -5.3≤F4 / R8≤-1. In an exemplary embodiment, the second side surface of the fourth lens may be a convex surface. By making the optical lens satisfy the above conditional formula, the radius of curvature of the second side surface of the fourth lens is made smaller, and the divergent light rays passing through the first side surface of the fourth lens can be quickly converged, which is beneficial to reducing the total optical length of the optical lens. At the same time, the deflection angle of the light emitted from the fourth lens can be made smaller to reduce the pressure on the rear lens (such as the fifth lens) to correct the aberration. Preferably, the optical lens may further satisfy: -4.3≤F4 / R8≤-1.7, so as to realize the miniaturization and / or high resolution of the optical lens.

[0060] In an exemplary embodiment, the optical lens may satisfy: 1.8≤F / H≤2.3. By making the optical lens satisfy the above conditional formula, the ratio of the total effective focal length to the image height corresponding to the maximum field angle is reasonably controlled, which is conducive to improving the resolution. Preferably, the optical lens may further satisfy: 1.9≤F / H≤2.2, so as to achieve high resolution of the optical lens.

[0061] In an exemplary embodiment, the optical lens may satisfy: 0.6≤t12 / d2≤1.5. By making the optical lens satisfy the above conditional formula, it is beneficial to improve the imaging quality of the optical lens. Preferably, the optical lens may further satisfy: 0.75≤t12 / d2≤1.35, achieving high imaging quality of the optical lens.

[0062] In an exemplary embodiment, the optical lens may satisfy: t45 / BFL≤0.15. By making the optical lens satisfy the above conditional formula, it is beneficial to improve the imaging quality of the optical lens. Preferably, the optical lens may further satisfy: 0.015≤t45 / BFL≤0.125, so as to achieve high imaging quality of the optical lens.

[0063] In an exemplary embodiment, the optical lens can simultaneously satisfy 0.6≤t12 / d2≤1.5, t45 / BFL≤0.15, 1≤F1 / F≤1.4, and the first side of the first lens is convex and the second side is concave. By controlling the effective focal length of the first lens to be relatively small, it is beneficial to collect field light into the optical system, and appropriately increase the spacing distance (such as air spacing) between the first lens and the second lens along the optical axis, which is beneficial to increase the system light flux and reduce the front lens aperture. At the same time, the spacing distance between the fourth lens and the fifth lens along the optical axis is small, which is more conducive to miniaturization while ensuring imaging quality. Preferably, further satisfying 0.75≤t12 / d2≤1.35 and / or 0.015≤t45 / BFL≤0.125 is more conducive to miniaturization while ensuring imaging quality.

[0064] In an exemplary embodiment, the optical lens may satisfy: t12 / d2≤0.3. By making the optical lens satisfy the above conditional formula, it is beneficial to improve the imaging quality of the optical lens. Preferably, the optical lens may further satisfy: 0.019≤t12 / d2≤0.26, achieving high imaging quality of the optical lens.

[0065] In an exemplary embodiment, the optical lens may satisfy: 0.8≤t45 / BFL≤5. By making the optical lens satisfy the above conditional formula, it is beneficial to improve the imaging quality of the optical lens. Preferably, the optical lens may further satisfy: 1≤t45 / BFL≤4, achieving high imaging quality of the optical lens.

[0066] In an exemplary embodiment, the optical lens can simultaneously satisfy t12 / d2≤0.3, 0.8≤t45 / BFL≤5, and the first side surface of the first lens is convex or concave, and the second side surface is convex, and its focal length is reasonably controlled, so that the spacing distance between the first lens and the second lens along the optical axis is small, and the spacing distance between the fourth lens and the fifth lens along the optical axis is large, which is conducive to ensuring that the optical lens can be miniaturized while making the light smoothly transition to the imaging surface, thereby further improving the imaging quality. Preferably, further satisfying 0.019≤t12 / d2≤0.26 and / or 1≤t45 / BFL≤4 is more conducive to improving the imaging quality.

[0067] In an exemplary embodiment, as needed, the optical lens of the present application may further include a filter and / or a protective glass disposed between the fifth lens and the imaging surface, the filter may filter light with different wavelengths, and the protective glass may prevent the elements (e.g., chip) on the second side of the optical lens from being damaged.

[0068] In an exemplary embodiment, the first to fifth lenses may be glass lenses or plastic lenses. 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 and resolution quality, the first to fifth lenses can all be glass aspherical lenses. In applications where temperature stability requirements are lower, the first to sixth lenses in the optical lens can also be made of plastic. Making optical lenses with plastic can effectively reduce production costs. Of course, the first to fifth lenses in the optical lens can also be made of a combination of plastic and glass.

[0069] According to the above-mentioned embodiment of the present application, the optical lens has at least one beneficial effect such as small aperture, high luminous flux, miniaturization, high resolution, small distortion, small CRA, low sensitivity, and weak ghost image through the reasonable setting of parameters such as lens shape and optical focal length.

[0070] 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.

[0071] 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 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. The following further describes a specific embodiment of the optical lens applicable to the above-mentioned embodiment with reference to the accompanying drawings.

[0072] Example 1

[0073] 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.

[0074] like Figure 1 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5 in sequence from the first side to the second side along the optical axis.

[0075] The first lens L1 has positive refractive power, a first side surface S1 of the first lens L1 is a convex surface, and a second side surface S2 of the first lens L1 is a concave surface.

[0076] The second lens L2 has positive refractive power, and its first side surface S3 is a convex surface, and its second side surface S4 is a concave surface.

[0077] The third lens L3 has negative refractive power, and its first side surface S5 is a concave surface, and its second side surface S6 is a concave surface.

[0078] The fourth lens L4 has positive refractive power, and its first side surface S7 is concave, and its second side surface S8 is convex.

[0079] The fifth lens L5 has positive refractive power, and its first side surface S9 is convex, and its second side surface S10 is concave.

[0080] The optical lens may further include a stop STO, and the stop STO may be disposed between the first lens L1 and the second lens L2.

[0081] The optical lens provided in this application can be used as, for example, a vehicle-mounted lens or a laser radar receiving end lens. In this case, Figure 1 IMA represents the imaging surface, and the light from the object passes through the surfaces S1 to S10 in sequence and is finally imaged on the imaging surface IMA disposed on the second side, wherein an image sensor chip is disposed on the imaging surface. It should be understood that the optical lens provided in the present application can also be used as, for example, a projection lens or a laser radar transmitting end lens. In this case, Figure 1Here, IMA represents a light source surface, and light from the light source surface passes through the surfaces S10 to S1 in sequence and is finally projected to the first side, and forms an image or an illuminated area on the first side.

[0082] Table 1 shows the curvature radius R, thickness / distance, refractive index Nd, and Abbe number Vd of each lens of the optical lens of Example 1.

[0083] Table 1

[0084]

[0085] In this embodiment, in terms of MTF, the MTF (Modulation transfer function) value of the optical lens at a spatial frequency of 17 lp / mm (17 lines / millimeter) exceeds 0.77, wherein MTF describes the ability of the optical lens to "restore" the object space in the image space, and the abscissa of the MTF graph is the spatial frequency. According to the above values, the optical lens provided in this embodiment has a high resolution capability.

[0086] Example 2

[0087] The following reference Figure 2 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 2 A schematic structural diagram of an optical lens according to Example 2 of the present application is shown.

[0088] like Figure 2 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5 in order from the first side to the second side along the optical axis. The surface shapes and positive and negative optical powers of the optical lens of Example 2 are different from those of Example 1 only in that the second side surface S10 of the fifth lens L5 of Example 2 is a convex surface.

[0089] Table 2 shows the parameters of each lens of the optical lens of Example 2.

[0090] Table 2

[0091]

[0092] In this embodiment, in terms of MTF, the MTF value of the optical lens at a spatial frequency of 17lp / mm exceeds 0.77. Based on the above values, the optical lens provided by this embodiment has a relatively high resolution.

[0093] Example 3

[0094] The following reference Figure 3The optical lens according to Embodiment 3 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 Example 3 of the present application is shown.

[0095] like Figure 3 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5 in order from the first side to the second side along the optical axis. The surface shapes and positive and negative optical powers of the optical lens of Example 3 are different from those of Example 1 only in that the second side surface S2 of the first lens L1 of Example 3 is a convex surface, and the first side surface S5 of the third lens L3 is a convex surface.

[0096] Table 3 shows the parameters of each lens of the optical lens of Example 3.

[0097] Table 3

[0098]

[0099] In this embodiment, in terms of MTF, the MTF value of the optical lens at a spatial frequency of 17lp / mm exceeds 0.69. Based on the above values, the optical lens provided by this embodiment has a relatively high resolution.

[0100] Example 4

[0101] The following reference Figure 4 The optical lens according to Embodiment 4 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 4 A schematic structural diagram of an optical lens according to Example 4 of the present application is shown.

[0102] like Figure 4 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5 in order from the first side to the second side along the optical axis. The surface shapes and positive and negative optical powers of the optical lens of Example 4 are different from those of Example 1 only in that the second side surface S2 of the first lens L1 of Example 4 is a convex surface, and the second side surface S6 of the third lens L3 is a convex surface.

[0103] Table 4 shows the parameters of each lens of the optical lens of Example 4.

[0104] Table 4

[0105]

[0106] In this embodiment, in terms of MTF, the MTF value of the optical lens at a spatial frequency of 12lp / mm exceeds 0.58. Based on the above values, the optical lens provided by this embodiment has a relatively high resolution.

[0107] Example 5

[0108] The following reference Figure 5 The optical lens according to Embodiment 5 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 5 A schematic structural diagram of an optical lens according to Example 5 of the present application is shown.

[0109] like Figure 5 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5 in order from the first side to the second side along the optical axis. The surface shapes and positive and negative optical powers of the optical lens of Example 5 are different from those of Example 1 only in that the first side surface S1 of the first lens L1 of Example 5 is a concave surface, and the second side surface S2 is a convex surface.

[0110] Table 5 shows the parameters of each lens of the optical lens of Example 5.

[0111] Table 5

[0112]

[0113] In this embodiment, in terms of MTF, the MTF value of the optical lens at a spatial frequency of 17lp / mm exceeds 0.55. Based on the above values, the optical lens provided by this embodiment has a relatively high resolution.

[0114] Example 6

[0115] The following reference Figure 6 The optical lens according to Embodiment 6 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 6 A schematic structural diagram of an optical lens according to Example 6 of the present application is shown.

[0116] like Figure 6 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5 in order from the first side to the second side along the optical axis. The surface shapes and positive and negative optical powers of the optical lens of Example 6 are different from those of Example 1 only in that the first side surface S9 of the fifth lens L5 of Example 6 is a concave surface, and the second side surface S10 is a convex surface.

[0117] Table 6 shows the parameters of each lens of the optical lens of Example 6.

[0118] Table 6

[0119]

[0120] In this embodiment, in terms of MTF, the MTF value of the optical lens at a spatial frequency of 12lp / mm exceeds 0.49. Based on the above values, the optical lens provided by this embodiment has a relatively high resolution.

[0121] Example 7

[0122] The following reference Figure 7 An optical lens according to Embodiment 7 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 7 A schematic structural diagram of an optical lens according to Example 7 of the present application is shown.

[0123] like Figure 7 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5 in sequence from the first side to the second side along the optical axis. The surface shape and positive and negative optical power of the optical lens of Example 7 are the same as those of Example 1.

[0124] Table 7 shows the parameters of each lens of the optical lens of Example 7.

[0125] Table 7

[0126]

[0127] In this embodiment, in terms of MTF, the MTF value of the optical lens at a spatial frequency of 17lp / mm exceeds 0.81. Based on the above values, the optical lens provided by this embodiment has a relatively high resolution.

[0128] Example 8

[0129] The following reference Figure 8 The optical lens according to Embodiment 8 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 8 A schematic structural diagram of an optical lens according to Example 8 of the present application is shown.

[0130] like Figure 8 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5 in order from the first side to the second side along the optical axis. The surface shapes and positive and negative optical powers of the optical lens of Example 8 are different from those of Example 1 only in that the second side surface S10 of the fifth lens L5 of Example 8 is a convex surface.

[0131] Table 8 shows the parameters of each lens of the optical lens of Example 8.

[0132] Table 8

[0133]

[0134] In this embodiment, in terms of MTF, the MTF value of the optical lens at a spatial frequency of 17lp / mm exceeds 0.82. Based on the above values, the optical lens provided by this embodiment has a relatively high resolution.

[0135] Example 9

[0136] The following reference Fig. 9 The optical lens according to Embodiment 9 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. Fig. 9 A schematic structural diagram of an optical lens according to Example 9 of the present application is shown.

[0137] like Fig. 9 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5 in order from the first side to the second side along the optical axis. The surface shapes and positive and negative optical powers of the optical lens of Example 9 are different from those of Example 1 only in that the second side surface S2 of the first lens L1 of Example 9 is a convex surface, and the first side surface S5 of the third lens L3 is a convex surface.

[0138] Table 9 shows the parameters of each lens of the optical lens of Example 9.

[0139] Table 9

[0140]

[0141] In this embodiment, in terms of MTF, the MTF value of the optical lens at a spatial frequency of 17lp / mm exceeds 0.74. Based on the above values, the optical lens provided by this embodiment has a relatively high resolution.

[0142] Example 10

[0143] The following reference Fig.10 The optical lens according to Embodiment 10 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. Fig.10 A schematic structural diagram of an optical lens according to Example 10 of the present application is shown.

[0144] like Fig.10As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5 in order from the first side to the second side along the optical axis. The surface shapes and positive and negative optical powers of the optical lens of Example 10 are different from those of Example 1 only in that the second side surface S2 of the first lens L1 of Example 10 is a convex surface, and the second side surface S6 of the third lens L3 is a convex surface.

[0145] Table 10 shows the parameters of each lens of the optical lens of Example 10.

[0146] Table 10

[0147]

[0148] In this embodiment, in terms of MTF, the MTF value of the optical lens at a spatial frequency of 17lp / mm exceeds 0.40. Based on the above values, the optical lens provided by this embodiment has a relatively high resolution.

[0149] Embodiment 11

[0150] The following reference Fig.11 An optical lens according to Embodiment 11 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. Fig.11 A schematic structural diagram of an optical lens according to Example 11 of the present application is shown.

[0151] like Fig.11 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5 in order from the first side to the second side along the optical axis. The surface shapes and positive and negative optical powers of the optical lens of Example 11 are different from those of Example 1 only in that the first side surface S1 of the first lens L1 of Example 11 is a concave surface, and the second side surface S2 is a convex surface.

[0152] Table 11 shows the parameters of each lens of the optical lens of Example 11.

[0153] Table 11

[0154]

[0155] In this embodiment, in terms of MTF, the MTF value of the optical lens at a spatial frequency of 17lp / mm exceeds 0.69. Based on the above values, the optical lens provided by this embodiment has a relatively high resolution.

[0156] Example 12

[0157] The following reference Fig.12The optical lens according to Embodiment 12 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. Fig.12 A schematic structural diagram of an optical lens according to Example 12 of the present application is shown.

[0158] like Fig.12 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5 in order from the first side to the second side along the optical axis. The surface shapes and positive and negative optical powers of the optical lens of Example 12 are different from those of Example 1 only in that the first side surface S9 of the fifth lens L5 of Example 12 is a concave surface, and the second side surface S10 is a convex surface.

[0159] Table 12 shows the parameters of each lens of the optical lens of Example 12.

[0160] Table 12

[0161]

[0162] In this embodiment, in terms of MTF, the MTF value of the optical lens at a spatial frequency of 17lp / mm exceeds 0.51. Based on the above values, the optical lens provided by this embodiment has a relatively high resolution.

[0163] Example 13

[0164] The following reference Fig.13 The optical lens according to Embodiment 13 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. Fig.13 A schematic structural diagram of an optical lens according to Example 13 of the present application is shown.

[0165] like Fig.13 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5 in sequence from the first side to the second side along the optical axis. The surface shapes and positive and negative optical powers of the optical lens of Example 13 are the same as those of Example 1.

[0166] Table 13 shows the parameters of each lens of the optical lens of Example 13.

[0167] Table 13

[0168]

[0169] In this embodiment, in terms of MTF, the MTF value of the optical lens at a spatial frequency of 17lp / mm exceeds 0.73. Based on the above values, the optical lens provided by this embodiment has a relatively high resolution.

[0170] Embodiment 14

[0171] The following reference Fig.14 The optical lens according to Embodiment 14 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. Fig.14 A schematic structural diagram of an optical lens according to Example 14 of the present application is shown.

[0172] like Fig.14 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5 in order from the first side to the second side along the optical axis. The surface shapes and positive and negative optical powers of the optical lens of Example 14 are different from those of Example 1 only in that the second side surface S10 of the fifth lens L5 of Example 14 is a convex surface.

[0173] Table 14 shows the parameters of each lens of the optical lens of Example 14.

[0174] Table 14

[0175]

[0176] In this embodiment, in terms of MTF, the MTF value of the optical lens at a spatial frequency of 17lp / mm exceeds 0.70. Based on the above values, the optical lens provided by this embodiment has a relatively high resolution.

[0177] Embodiment 15

[0178] The following reference Fig.15 The optical lens according to Embodiment 15 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. Fig.15 A schematic structural diagram of an optical lens according to Example 15 of the present application is shown.

[0179] like Fig.15 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5 in order from the first side to the second side along the optical axis. The surface shapes and positive and negative optical powers of the optical lens of Example 15 are different from those of Example 1 only in that the second side surface S2 of the first lens L1 of Example 15 is a convex surface, and the first side surface S5 of the third lens L3 is a convex surface.

[0180] Table 15 shows the parameters of each lens of the optical lens of Example 15.

[0181] Table 15

[0182]

[0183] In this embodiment, in terms of MTF, the MTF value of the optical lens at a spatial frequency of 17lp / mm exceeds 0.68. Based on the above values, the optical lens provided by this embodiment has a relatively high resolution.

[0184] Example 16

[0185] The following reference Fig.16 The optical lens according to Embodiment 16 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. Fig.16 A schematic structural diagram of an optical lens according to Example 16 of the present application is shown.

[0186] like Fig.16 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5 in order from the first side to the second side along the optical axis. The surface shapes and positive and negative optical powers of the optical lens of Example 16 are different from those of Example 1 only in that the first side surface S1 of the first lens L1 of Example 16 is a concave surface, and the second side surface S2 is a convex surface.

[0187] Table 16 shows the parameters of each lens of the optical lens of Example 16.

[0188] Table 16

[0189]

[0190] In this embodiment, in terms of MTF, the MTF value of the optical lens at a spatial frequency of 12lp / mm exceeds 0.58. Based on the above values, the optical lens provided by this embodiment has a relatively high resolution.

[0191] In addition, the optical lenses provided in Examples 1 to 16 of the present application can all achieve good imaging quality, and their MTF (modulation transfer function) curve diagrams are relatively close. Figures 17 to 22 Only schematic diagrams of the MTF (modulation transfer function) curves of the optical lenses of Example 1, Example 2, Example 7, Example 8, Example 13 and Example 14 are shown for example, and schematic diagrams of the MTF (modulation transfer function) curves of the central field light of the optical lenses of other embodiments are no longer shown one by one, and those skilled in the art should also be able to know based on the content disclosed in this application. In this application, the FNO of the optical lenses of Examples 1 to 6 is 1.75; the FNO of the optical lenses of Examples 7 to 12 is 2; the FNO of the optical lenses of Examples 13, 14 and 16 is 1.55, and the FNO of the optical lens of Example 15 is 1.75. According to the above values, the optical lenses of the embodiments of this application can all achieve small FNO.

[0192] In summary, Examples 1 to 16 respectively satisfy the relationships shown in Tables 17-1 and 17-2. In Tables 17-1 and 17-2, the units of F, TTL, H, BFL, F1~F5, D, and D10 are millimeters (mm), the unit of FOV is degrees (°), and the unit of θ is radians (rad).

[0193] Table 17-1

[0194]

[0195] Table 17-2

[0196]

[0197] 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.

[0198] 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; a second lens having positive optical power, wherein the first side surface is convex and the second side surface is concave; a third lens having negative optical power; a fourth lens element having positive optical power, wherein the first side surface is concave and the second side surface is convex; and a fifth lens having positive refractive power; The number of lenses with optical power in the optical lens is five, and the optical lens satisfies: 0.03≤BFL / TTL≤0.3, 0.24≤R3 / (R4+d2)≤0.9, -7≤R7 / (d4+d5+t45+BFL)≤-0.5, -1.5≤(1 / F1+1 / F2+1 / F3) / (1 / F)≤-0.1, wherein BFL is the optical back focus of the optical lens, TTL is the total optical length of the optical lens, R3 is the curvature radius of the first side surface of the second lens, R4 is the curvature radius of the second side surface of the second lens, R7 is the curvature radius of the first side surface of the fourth lens, d2 is the center thickness of the second lens, d4 is the center thickness of the fourth lens, d5 is the center thickness of the fifth lens, t45 is the spacing distance between the fourth lens and the fifth lens along the optical axis, 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, and F3 is the effective focal length of the third lens.

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

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

4. The optical lens according to claim 1, characterized in that: The first side surface of the fifth lens is convex, and the second side surface is convex or concave, or the first side surface is concave, and the second side surface is convex.

5. The optical lens according to claim 1, characterized in that: The optical lens meets the following requirements: TTL / F≤2.5, Wherein, F is the total effective focal length of the optical lens, and TTL is the total optical length of the optical lens.

6. The optical lens according to claim 1, characterized in that: The optical lens meets at least one of the following requirements: 1≤F1 / F≤1.4, 0.6≤t12 / d2≤1.5, t45 / BFL≤0.15, Among them, F is the total effective focal length of the optical lens, F1 is the effective focal length of the first lens, t12 is the spacing distance between the first lens and the second lens along the optical axis, t45 is the spacing distance between the fourth lens and the fifth lens along the optical axis, BFL is the optical back focus of the optical lens, and d2 is the center thickness of the second lens.

7. The optical lens according to claim 1, characterized in that: The optical lens meets the following requirements: -1.5≤F3 / F≤-0.2, Wherein, F is the total effective focal length of the optical lens, and F3 is the effective focal length of the third lens.

8. The optical lens according to claim 1, characterized in that: The optical lens meets the following requirements: 0.6≤F4 / F≤4.2, Wherein, F is the total effective focal length of the optical lens, and F4 is the effective focal length of the fourth lens.

9. The optical lens according to claim 1, characterized in that: The optical lens meets the following requirements: 0.4≤F5 / F≤2.3, Wherein, F is the total effective focal length of the optical lens, and F5 is the effective focal length of the fifth lens.

10. The optical lens according to claim 1, characterized in that: The optical lens meets the following requirements: -1.4≤R4 / R7<0, Wherein, R4 is the curvature radius of the second side surface of the second lens, and R7 is the curvature radius of the first side surface of the fourth lens.

11. The optical lens according to claim 1, characterized in that: The optical lens meets the following requirements: -1.2≤(1 / F1+1 / F2) / (1 / F3)≤-0.3, Wherein, F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, and F3 is the effective focal length of the third lens.

12. The optical lens according to claim 1, characterized in that: The optical lens meets the following requirements: 0.08≤d2 / TTL≤0.18, Wherein, d2 is the center thickness of the second lens, and TTL is the total optical length of the optical lens.

13. The optical lens according to claim 1, characterized in that: The optical lens meets the following requirements: |(H-D10) / BFL|≤0.7, Among them, BFL is the optical back focus of the optical lens, D10 is the maximum light clearance aperture of the second side surface of the fifth lens corresponding to the maximum field angle of the optical lens, and H is the image height corresponding to the maximum field angle of the optical lens.

14. The optical lens according to claim 1, characterized in that: The optical lens meets the following requirements: -5.3≤F4 / R8≤-1, Wherein, F4 is the effective focal length of the fourth lens, and R8 is the curvature radius of the second side surface of the fourth lens.

15. The optical lens according to claim 1, characterized in that: The optical lens meets the following requirements: 1.8≤F / H≤2.3, Wherein, F is the total effective focal length of the optical lens, and H is the image height corresponding to the maximum field angle of the optical lens.

16. The optical lens according to claim 1, characterized in that: The optical lens meets at least one of the following requirements: 0.06≤TTL / H / FOVx1°≤0.15,0.02≤D / H / FOVx1°≤0.1,0.01mm -1 ≤D / H / F≤0.1mm -1 ,0.4rad≤(F θ) / D≤1rad, Among them, 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, TTL is the total optical length of the optical lens, D is the maximum light clearance aperture of the first side surface of the first lens corresponding to the maximum field of view of the optical lens, and θ is the radian value corresponding to the maximum field of view of the optical lens.

17. The optical lens according to claim 1, characterized in that: The optical lens meets at least one of the following requirements: 0.5≤F2 / F≤8.5,0.15≤R3 / TTL≤1,0.2≤R4 / TTL≤1.5,-3≤R7 / TTL≤-0.3,-0.9≤R8 / TTL≤-0.1,|(H / 2-F θ / 2) / (F θ / 2)|≤0.1,0.2≤R3 / R4≤1.5,1≤TTL / F≤2,0.02mm -1 ≤D / H / F≤0.07mm -1 ,-4.2≤R7 / (d4+d5+t45+BFL)≤-0.1,0.3≤R3 / R4≤1.3,|(H-D10) / BFL|≤0.55,0.019≤t12 / d2≤0.26,1≤t45 / BFL≤4, Wherein, 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, R3 is the curvature radius of the first side surface of the second lens, R4 is the curvature radius of the second side surface of the second lens, R7 is the curvature radius of the first side surface of the fourth lens, R8 is the curvature radius of the second side surface of the fourth lens, TTL is the total optical length of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, θ is the radian value 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 light-clearing aperture of the first side surface of the first lens corresponding to the maximum field of view of the optical lens, BFL is the optical back focus of the optical lens, d4 is the center thickness of the fourth lens, d5 is the center thickness of the fifth lens, t12 is the spacing distance between the first lens and the second lens along the optical axis, t45 is the spacing distance between the fourth lens and the fifth lens along the optical axis, and D10 is the maximum light-clearing aperture of the second side surface of the fifth lens corresponding to the maximum field of view of the optical lens.

18. The optical lens according to claim 1, characterized in that: The optical lens meets at least one of the following requirements: 1.2≤TTL / F≤1.7,0.09≤TTL / H / FOVx1°≤0.13,0.06≤BFL / TTL≤0.23,0.03≤D / H / FOVx1°≤0.07,0.03mm -1 ≤D / H / F≤0.06mm -1 ,0.5rad≤(F θ) / D≤0.92rad,1≤F1 / F≤2.6,1≤F2 / F≤6,-1.1≤F3 / F≤-0.4,1≤F4 / F≤3.2,0.8≤F5 / F≤1.8,0.35≤R3 / TTL≤0.7,0.6≤R4 / TTL≤1.2,-1.6≤R7 / TTL≤-0.7,-0.6≤R8 / TTL≤-0.35,0.03≤|(H / 2-F θ / 2) / (F θ / 2)|≤0.09,0.35≤R3 / (R4+d2)≤0.7,-3.5≤R7 / (d4+d5+t45+BFL)≤-1.4,-1≤R4 / R7≤-0.7,-0.9≤(1 / F1+1 / F2+1 / F3) / (1 / F)≤-0.14,-1≤(1 / F1+1 / F2) / (1 / F3)≤-0.5,0.4≤R3 / R4≤1,0.1≤d2 / TTL≤0.15,0.02≤|(H-D10) / BFL|≤0.35,-4.3≤F4 / R8≤-1.7,1.9≤F / H≤2.2,0.75≤t12 / d2≤1.35,0.015≤t45 / BFL≤0.125, Wherein, 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, TTL is the total optical length of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, FOV is the maximum field of view of the optical lens, D is the maximum aperture of the first side of the first lens corresponding to the maximum field of view of the optical lens, and D10 is the maximum field of view of the fifth lens corresponding to the maximum field of view of the optical lens. BFL is the optical back focus of the optical lens, R3 is the curvature radius of the first side of the second lens, R4 is the curvature radius of the second side of the second lens, R7 is the curvature radius of the first side of the fourth lens, R8 is the curvature radius of the second side of the fourth lens, d2 is the center thickness of the second lens, d4 is the center thickness of the fourth lens, d5 is the center thickness of the fifth lens, t45 is the spacing distance between the fourth lens and the fifth lens along the optical axis, and θ is the radian value corresponding to the maximum field of view angle of the optical lens.

19. The optical lens according to claim 1, characterized in that: The optical lens meets at least one of the following requirements: t12 / d2≤0.3, 0.8≤t45 / BFL≤5, 0.4≤F1 / F≤3, Wherein, d2 is the center thickness of the second lens, t12 is the spacing distance between the first lens and the second lens along the optical axis, t45 is the spacing distance between the fourth lens and the fifth lens along the optical axis, and BFL is the optical back focus of the optical lens.

20. An electronic device, characterized in that: The optical lens comprises any one of claims 1 to 19, and comprises an imaging element for converting an optical image formed by the optical lens into an electrical signal, or comprises a light source.

Images