Optical lens and optical imaging device

Abstract

An optical lens and an optical imaging device are applied to the technical field of optical imaging. The optical lens comprises a first lens, a second lens, a third lens and a fourth lens which are coaxially arranged in sequence from an object side to an image side, the first lens, the third lens and the fourth lens have positive focal power, and the second lens has negative focal power; the first lens is a meniscus lens, the second lens is a biconcave lens, the third lens is a meniscus lens, and the fourth lens is a meniscus lens. According to the optical lens, an optical structure of four lenses is adopted, and through arrangement of the shapes of the four lenses and reasonable distribution of focal power, system aberration introduced by a large aperture can be reduced, so that high resolution performance of the optical lens under the large aperture is realized.

Description

Technical Field

[0001] This application relates to the field of optical imaging technology, and particularly to an optical lens and an optical imaging device. Background Art

[0002] An aperture is a device used to control the amount of light passing through the lens and entering the photosensitive surface inside the camera body. Generally speaking, the size of the aperture is determined by the lens aperture and the focal length. The larger the aperture of the lens, the more light enters through the aperture per unit time, the richer the information obtained by the photosensitive element, and the better the final imaging effect.

[0003] However, the large-aperture design often increases the complexity of the optical system design and introduces greater system aberrations.

[0004] Therefore, how to reduce the aberrations introduced by a large aperture is a hot issue being studied by those skilled in the art. Summary of the Invention

[0005] Embodiments of this application provide an optical lens and an optical imaging device, which can reduce the aberrations introduced by a large aperture.

[0006] In a first aspect, embodiments of this application provide an optical lens, which includes:

[0007] A first lens, a second lens, a third lens, and a fourth lens coaxially arranged in sequence from the object side to the image side;

[0008] The first lens, the third lens, and the fourth lens have positive optical powers, and the second lens has a negative optical power;

[0009] The first lens is a meniscus lens, the second lens is a biconcave lens, the third lens is a meniscus lens, and the fourth lens is a meniscus lens.

[0010] In an embodiment of the present application, an optical lens is provided. The first lens in the optical lens is a meniscus lens with a positive optical power, which can collect light in the field of view as much as possible, enable more light to enter the rear optical system, and is beneficial to reducing the lens aperture of the second lens. The second lens in the optical lens is a biconcave lens with a negative optical power, which is beneficial to smoothly transition the light collected by the first lens to the third lens and is beneficial to increasing the depth of field (DOF) of the optical lens. The third lens in the optical lens is a meniscus lens with a positive optical power, which can converge light better, is beneficial to reducing system aberration and distortion, thereby improving the resolution of the optical lens. The fourth lens in the optical lens is a meniscus lens with a positive optical power, which can quickly converge the light collected in the front to the rear optical system. The embodiment of the present application adopts an optical architecture of four lenses. By setting the shapes of the four lenses and reasonably distributing the optical powers, the system aberration introduced by a large aperture can be reduced, thereby achieving high-resolution performance of the optical lens under a large aperture and reducing the volume of the optical lens.

[0011] In a possible implementation manner, the object side surface of the first lens is convex, and the image side surface of the first lens is concave; the object side surface of the second lens is concave, and the image side surface of the second lens is concave; the object side surface of the third lens is concave, and the image side surface of the third lens is convex; the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is concave.

[0012] In an implementation manner of the present application, a possible specific implementation manner of the first lens, the second lens, the third lens, and the fourth lens is provided. Specifically, the object side surface of the first lens is convex, and the image side surface is concave. By setting the first lens as a meniscus-shaped positive optical power lens with the convex surface facing the object side, the light in the field of view can be collected as much as possible, enabling more light to enter the rear optical system, and is beneficial to reducing the lens aperture of the second lens. The object side surface of the second lens is concave, and the image side surface is concave. By setting the second lens as a biconcave negative optical power lens, the light collected by the first lens can be smoothly transitioned to the third lens, and is beneficial to increasing the DOF of the optical lens, improving the yield of the assembly of each lens, and ensuring the sensitivity of the lens. The object side surface of the third lens is concave, and the image side surface is convex. By setting the third lens as a meniscus-shaped positive optical power lens with the convex surface facing the image side, the light can be converged better, which is beneficial to reducing system aberration and distortion, thereby improving the resolution of the optical lens. The object side surface of the fourth lens is convex, and the image side surface is concave. By setting the fourth lens as a meniscus-shaped positive optical power lens with the convex surface facing the object side, the light collected in the front can be quickly converged to the rear optical system.

[0013] In a possible implementation manner, the third lens is an aspherical lens.

[0014] In the embodiment of the present application, a possible specific embodiment of the third lens is provided, specifically, the third lens is an aspherical lens, the characteristic of the aspherical lens is that the curvature changes continuously from the center of the lens to the periphery. Unlike the spherical lens with a constant curvature from the center of the lens to the periphery, the aspherical lens has a better curvature radius characteristic, a greater degree of freedom, and has the advantages of improving distortion aberration and improving astigmatism aberration. After the third lens adopts an aspherical lens, the effect of converging light is better, and the aberration occurring during imaging can be eliminated as much as possible, thereby improving the imaging quality of the optical lens.

[0015] In a possible implementation manner, the optical lens further includes:

[0016] Optical filters;

[0017] The filter is located on the object side of the first lens.

[0018] In the embodiment of the present application, a possible specific embodiment of an optical lens is provided, specifically, the optical lens further includes a filter, and the filter is located on the object side of the first lens. The filter is a colored transparent sheet that has the functions of absorbing, reflecting and transmitting colored light, and can filter unnecessary noise from the light before entering the first lens and correct color deviation.

[0019] In a second aspect, an embodiment of the present application provides an optical lens, the optical lens comprising:

[0020] A first lens, a second lens, a third lens, and a fourth lens are coaxially arranged in sequence from the object side to the image side;

[0021] The first lens, the third lens and the fourth lens have positive refractive power, and the second lens has negative refractive power;

[0022] The first lens is a biconvex lens, the second lens is a biconcave lens, the third lens is a meniscus lens, and the fourth lens is a meniscus lens.

[0023] In an embodiment of the present application, an optical lens is provided. The first lens in the optical lens is a biconvex lens with a positive optical power, which can collect light in the field of view as much as possible, allow more light to enter the rear optical system, and is beneficial to reducing the lens diameter of the second lens. The second lens in the optical lens is a biconcave lens with a negative optical power, which is beneficial to smoothly transition the light collected by the first lens to the third lens and is beneficial to increasing the depth of field (DOF) of the optical lens. The third lens in the optical lens is a meniscus lens with a positive optical power, which can converge light better, is beneficial to reducing system aberration and distortion, and thus improves the resolution of the optical lens. The fourth lens in the optical lens is a meniscus lens with a positive optical power, which can quickly converge the light collected in the front to the rear optical system. The embodiment of the present application adopts an optical structure of four lenses. By setting the shapes of the four lenses and reasonably distributing the optical powers, the system aberration introduced by a large aperture can be reduced, so as to achieve high-resolution performance of the optical lens under a large aperture, and the volume of the optical lens can be reduced.

[0024] In a possible implementation manner, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a convex surface; the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a concave surface; the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface.

[0025] In an implementation manner of the present application, a possible specific implementation manner of the first lens, the second lens, the third lens, and the fourth lens is provided. Specifically, the object side surface of the first lens is a convex surface, and the image side surface is a convex surface. By setting the first lens as a biconvex lens with a positive optical power, light in the field of view can be collected as much as possible, more light can enter the rear optical system, and it is beneficial to reducing the lens diameter of the second lens. The object side surface of the second lens is a concave surface, and the image side surface is a concave surface. By setting the second lens as a biconcave lens with a negative optical power, the light collected by the first lens can be smoothly transitioned to the third lens, and it is beneficial to increasing the DOF of the optical lens, improving the yield of the assembly of each lens, and ensuring the sensitivity of the lens. The object side surface of the third lens is a concave surface, and the image side surface is a convex surface. By setting the third lens as a meniscus lens with a positive optical power with the convex surface facing the image side, light can be converged better, which is beneficial to reducing system aberration and distortion, and thus improving the resolution of the optical lens. The object side surface of the fourth lens is a convex surface, and the image side surface is a concave surface. By setting the fourth lens as a meniscus lens with a positive optical power with the convex surface facing the object side, the light collected in the front can be quickly converged to the rear optical system.

[0026] In a possible implementation manner, the first lens is an aspherical lens, and the third lens is an aspherical lens.

[0027] In an embodiment of the present application, a possible specific embodiment of a first lens and a third lens is provided. Specifically, the first lens is an aspherical lens, and the third lens is an aspherical lens. The characteristic of an aspherical lens is that the curvature continuously changes from the center to the periphery of the lens. Different from a spherical lens with a constant curvature from the center to the periphery, an aspherical lens has better curvature radius characteristics, greater degrees of freedom, and has the advantages of improving distortion aberration and improving astigmatism aberration. After the first lens and the third lens adopt aspherical lenses, the effect of converging light is better, and the aberration that appears during imaging can be eliminated as much as possible, thereby improving the imaging quality of the optical lens.

[0028] In a possible embodiment, the optical lens further includes:

[0029] A filter;

[0030] The filter is located on the image side of the first lens and the object side of the second lens.

[0031] In an embodiment of the present application, a possible specific embodiment of an optical lens is provided. Specifically, the optical lens further includes a filter, and the filter is located on the image side of the first lens and the object side of the second lens. The filter is a colored transparent sheet that has absorption, reflection, and transmission effects on colored light, can filter unnecessary noise from the light before entering the second lens, and correct color deviation. Moreover, the filter is built into the lens of the optical lens, which can make the light passing aperture smaller, and is beneficial to reducing the material cost for controlling the light passing aperture.

[0032] In a third aspect, an embodiment of the present application provides an optical lens, and the optical lens includes:

[0033] A first lens, a second lens, a third lens, and a fourth lens that are coaxially arranged in sequence from the object side to the image side;

[0034] The first lens, the third lens, and the fourth lens have positive optical powers, and the second lens has a negative optical power;

[0035] The first lens is a plano-convex lens, the second lens is a meniscus lens, the third lens is a meniscus lens, and the fourth lens is a meniscus lens.

[0036] In the embodiments of the present application, an optical lens is provided. The first lens in the optical lens is a plano-convex lens with a positive optical power, which can collect the light in the field of view as much as possible, enable more light to enter the rear optical system, and is beneficial to reducing the lens aperture of the second lens. The second lens in the optical lens is a meniscus lens with a negative optical power, which is beneficial to smoothly transition the light collected by the first lens to the third lens and is beneficial to increasing the DOF of the optical lens. The third lens in the optical lens is a meniscus lens with a positive optical power, which can converge the light better, is beneficial to reducing the system aberration and distortion, thereby improving the resolution of the optical lens. The fourth lens in the optical lens is a meniscus lens with a positive optical power, which can quickly converge the light collected in the front to the rear optical system. The embodiments of the present application adopt an optical architecture of four lenses. By setting the shapes of the four lenses and reasonably distributing the optical powers, the system aberration introduced by the large aperture can be reduced, thereby realizing the high-resolution performance of the optical lens under the large aperture and reducing the volume of the optical lens.

[0037] In a possible implementation manner, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a plane; the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface.

[0038] In the implementation manner of the present application, a possible specific implementation manner of the first lens, the second lens, the third lens, and the fourth lens is provided. Specifically, the object side surface of the first lens is a convex surface, and the image side surface is a plane. By setting the first lens as a plano-convex lens with a positive optical power with the convex surface facing the object side, the light in the field of view can be collected as much as possible, enabling more light to enter the rear optical system, and is beneficial to reducing the lens aperture of the second lens. The object side surface of the second lens is a concave surface, and the image side surface is a convex surface. By setting the second lens as a lens with a negative optical power with the convex surface facing the image side, the light collected by the first lens can be smoothly transitioned to the third lens, and is beneficial to increasing the DOF of the optical lens, improving the yield rate of the assembly of each lens, and ensuring the sensitivity of the lens. The object side surface of the third lens is a concave surface, and the image side surface is a convex surface. By setting the third lens as a meniscus lens with a positive optical power with the convex surface facing the image side, the light can be converged better, which is beneficial to reducing the system aberration and distortion, thereby improving the resolution of the optical lens. The object side surface of the fourth lens is a convex surface, and the image side surface is a concave surface. By setting the fourth lens as a meniscus lens with a positive optical power with the convex surface facing the object side, the light collected in the front can be quickly converged to the rear optical system.

[0039] In a possible implementation manner, the third lens is an aspherical lens, and the fourth lens is an aspherical lens.

[0040] In an embodiment of the present application, a possible specific embodiment of the third lens and the fourth lens is provided. Specifically, the third lens and the fourth lens are aspherical lenses. The characteristic of an aspherical lens is that the curvature continuously changes from the center to the periphery of the lens. Different from a spherical lens with a constant curvature from the center to the periphery of the lens, an aspherical lens has better curvature radius characteristics, greater degrees of freedom, and has the advantages of improving distortion aberration and astigmatism aberration. After the third lens and the fourth lens adopt aspherical lenses, the effect of converging light is better, and the aberration that appears during imaging can be eliminated as much as possible, thereby improving the imaging quality of the optical lens.

[0041] In a possible embodiment, the optical lens further includes:

[0042] A filter;

[0043] The filter is located on the object side of the first lens.

[0044] In an embodiment of the present application, a possible specific embodiment of an optical lens is provided. Specifically, the optical lens further includes a filter, and the filter is located on the object side of the first lens. The filter is a colored transparent sheet that has the functions of absorbing, reflecting, and transmitting colored light, and can filter unnecessary noise from the light before entering the first lens and correct color deviation.

[0045] Combined with the optical lens described in any one of the first to third aspects above, in a possible embodiment, the focal length of the first lens satisfies the following relationship:

[0046] 1≤f1 / F≤3.5;

[0047] Wherein, f1 is the focal length of the first lens, and F is the focal length of the optical lens.

[0048] Combined with the optical lens described in any one of the first to third aspects above, in a possible embodiment, the material of the first lens includes a first material, and the first material is used to suppress the temperature drift of the first lens.

[0049] Combined with the optical lens described in any one of the first to third aspects above, in a possible embodiment, the focal length of the second lens satisfies the following relationship:

[0050] -2.5≤f2 / F≤-1.5;

[0051] Wherein, f2 is the focal length of the second lens, and F is the focal length of the optical lens.

[0052] Combined with the optical lens described in any one of the first to third aspects above, in a possible implementation, the focal length of the third lens satisfies the following relationship:

[0053] 0.9 ≤ f3 / F ≤ 1.9;

[0054] where f3 is the focal length of the third lens and F is the focal length of the optical lens.

[0055] Combined with the optical lens described in any one of the first to third aspects above, in a possible implementation, the object side and the image side of the fourth lens satisfy the following relationship:

[0056] 0.15 ≤ R1 / f4 ≤ 0.6, 0.15 ≤ R2 / f4 ≤ 0.6;

[0057] where R1 is the radius of curvature of the object side of the fourth lens, R2 is the radius of curvature of the image side of the fourth lens, and f4 is the focal length of the fourth lens.

[0058] Combined with the optical lens described in any one of the first to third aspects above, in a possible implementation, the focal length of the optical lens satisfies the following relationship:

[0059] 1.5 ≤ T / F ≤ 2.5;

[0060] where T is the distance from the center of the object side of the first lens to the imaging surface of the optical lens on the optical axis, and F is the focal length of the optical lens.

[0061] Fourth aspect, an embodiment of the present application provides an optical imaging device, and the optical imaging device includes the optical lens described in any one of the first to third aspects above and any possible implementation.

[0062] Optionally, the optical imaging device may further include an imaging sensor.

[0063] Optionally, the optical imaging device may be a device such as a lidar or a camera device.

[0064] Optionally, the optical lens may also be applied to other optical imaging devices that need to receive light, and no limitation is made here.

[0065] Fifth aspect, an embodiment of the present application provides a terminal device, and the terminal device includes the optical lens described in any one of the first to third aspects above and any possible implementation, or includes the optical imaging device described in the fourth aspect above.

[0066] In a sixth aspect, an embodiment of the present application provides a vehicle end, which includes the optical lens described in any one of the first to third aspects and any possible implementation manners above, or includes the optical imaging device described in the fourth aspect above, or includes the terminal device described in the fifth aspect above.

[0067] In the embodiment of the present application, an optical architecture with four lenses is adopted. By setting the shapes of the four lenses and reasonably distributing the optical powers, the system aberration introduced by a large aperture can be reduced, thereby achieving high resolution performance of the optical lens under a large aperture. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments of the present application. Obviously, the following described drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0069] Figure 1 It is a schematic structural diagram of an optical lens provided by an embodiment of the present application;

[0070] Figure 2 It is a schematic diagram of an optical path provided by an embodiment of the present application;

[0071] Figure 3 It is a schematic structural diagram of an optical lens provided by an embodiment of the present application;

[0072] Figure 4 It is a schematic diagram of an optical path provided by an embodiment of the present application;

[0073] Figure 5 It is a schematic structural diagram of an optical lens provided by an embodiment of the present application;

[0074] Figure 6 It is a schematic diagram of an optical path provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0075] In order to make the objectives, technical solutions, and advantages of the present application clearer, the following will describe the embodiments of the present application with reference to the drawings in the embodiments of the present application.

[0076] In the description, claims, and drawings of this application, terms such as "first" and "second" are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units not listed, or optionally also includes other steps or units inherent to these processes, methods, products, or devices.

[0077] As used herein, "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of this application. The phrase appearing at various positions in the description does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art can explicitly and implicitly understand that, in various embodiments of this application, if there is no special description and logical conflict, the terms and / or descriptions among the various embodiments are consistent and can be referenced to each other, and the technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0078] It should be understood that in this application, "at least one (item)" means one or more, "a plurality" means two or more, "at least two (items)" means two or three or more, and "and / or" is used to describe the association relationship of associated objects, indicating that three relationships can exist. For example, "A and / or B" can mean: only A exists, only B exists, and both A and B exist simultaneously. Here, A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one (one) of the following" or its similar expression means any combination of these items, including any combination of single item (one) or plural items (ones). For example, at least one (one) of a, b, or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0079] In the drawings, for the sake of clarity, the thickness, size, and shape of the lens have been slightly exaggerated. Specifically, the spherical or aspherical shape shown in the drawings is presented by way of example. That is, the spherical or aspherical shape is not limited to the spherical or aspherical shape shown in the drawings. The drawings are only examples and are not drawn to an exact scale.

[0080] As described in the background art section, currently, large aperture designs often increase the complexity of optical system design and introduce greater system aberrations. This application provides an optical lens and an optical imaging device, which relate to the field of optical imaging technology and can reduce the aberrations introduced by a large aperture.

[0081] The optical lens and the optical imaging device provided by the present application will be described below in conjunction with the accompanying drawings.

[0082] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of an optical lens provided by an embodiment of the present application.

[0083] As Figure 1 shown, the optical lens includes:

[0084] A first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 that are coaxially arranged in sequence from the object side to the image side.

[0085] Among them, the first lens L1, the third lens L3, and the fourth lens L4 have positive optical powers, and the second lens L2 has a negative optical power.

[0086] The first lens L1 is a meniscus lens, the second lens L2 is a biconcave lens, the third lens L3 is a meniscus lens, and the fourth lens L4 is a meniscus lens.

[0087] It can be understood that the first lens L1 in the optical lens is a meniscus lens with a positive optical power, which can collect the light in the field of view as much as possible, enable more light to enter the rear optical system, and is beneficial to reducing the lens aperture of the second lens L2.

[0088] The second lens L2 in the optical lens is a biconcave lens with a negative optical power, which is beneficial to smoothly transition the light collected by the first lens L1 to the third lens L3 and is beneficial to increasing the depth of field (DOF) of the optical lens.

[0089] The third lens L3 in the optical lens is a meniscus lens with a positive optical power, which can converge the light better, is beneficial to reducing the system aberration and distortion, and thus improving the resolution of the optical lens.

[0090] The fourth lens L4 in the optical lens is a meniscus lens with a positive optical power, which can quickly converge the light collected in the front to the rear optical system.

[0091] In the embodiment of the present application, an optical architecture of four lenses (L1, L2, L3, L4) is adopted. By setting the shapes of the four lenses and the reasonable distribution of the optical powers, the system aberration introduced by the large aperture can be reduced, so as to achieve the high-resolution performance of the optical lens under the large aperture.

[0092] In a possible embodiment, the object side surface S4 of the first lens L1 is a convex surface, and the image side surface S5 of the first lens L1 is a concave surface.

[0093] Through the embodiments of the present application, the first lens L1 is set as a meniscus lens with a positive optical power and a convex surface facing the object side, which can collect the light within the field of view as much as possible, enable more light to enter the rear optical system, and is beneficial to reducing the lens aperture of the second lens L2.

[0094] Optionally, the material of the first lens L1 includes a first material, which is used to suppress the temperature drift of the first lens L1.

[0095] Exemplarily, the first material may include, but is not limited to, at least one of the following: glass of model H-ZPK1A, glass of model H-FK61.

[0096] Through the embodiments of the present application, the temperature drift resistance ability of the first lens L1 can be improved.

[0097] In a possible embodiment, the object side surface S6 of the second lens L2 is concave, and the image side surface S7 of the second lens L2 is concave.

[0098] Through the embodiments of the present application, the second lens L2 is set as a double concave lens with a negative optical power, which can smoothly transition the light collected by the first lens L1 to the third lens L3, and is beneficial to increasing the DOF of the optical lens, improving the yield rate of each lens assembly, and ensuring the sensitivity of the lens.

[0099] In a possible embodiment, the object side surface S8 of the third lens L3 is concave, and the image side surface S9 of the third lens L3 is convex.

[0100] Through the embodiments of the present application, the third lens L3 is set as a meniscus lens with a positive optical power and a convex surface facing the image side, which can converge the light better, is beneficial to reducing the system aberration and distortion, and thus improving the resolution of the optical lens.

[0101] In a possible embodiment, the object side surface S10 of the fourth lens L4 is convex, and the image side surface S11 of the fourth lens L4 is concave.

[0102] Through the embodiments of the present application, the fourth lens L4 is set as a meniscus lens with a positive optical power and a convex surface facing the object side, which can quickly converge the light collected in the front to the rear optical system (for example, the imaging sensor L6).

[0103] It should be understood that in the embodiments of the present application, the surface closest to the object in each lens is called the object side surface, and the surface closest to the imaging surface in each lens is called the image side surface, which will not be elaborated hereinafter.

[0104] In a possible embodiment, the third lens L3 is an aspherical lens.

[0105] It is understandable that the aspherical lens is characterized by a continuously changing curvature from the center to the periphery of the lens. Different from the spherical lens with a constant curvature from the center to the periphery of the lens, the aspherical lens has better curvature radius characteristics, greater freedom, and has the advantages of improving distortion aberration and astigmatism aberration.

[0106] Therefore, after the third lens L3 in the embodiment of the present application adopts an aspherical lens, the effect of converging light is better, and the aberration that appears during imaging can be eliminated as much as possible, thereby improving the imaging quality of the optical lens.

[0107] In a possible embodiment, the optical lens may further include:

[0108] A filter L5.

[0109] The filter L5 is located on the object side of the first lens L1.

[0110] It is understandable that the filter L5 is a colored transparent sheet that has the functions of absorbing, reflecting, and transmitting colored light, and can filter unnecessary noise from the light before entering the first lens L1 and correct color deviation.

[0111] Optionally, the optical lens may further include:

[0112] An aperture STO.

[0113] The aperture STO is disposed between the filter L5 and the first lens L1.

[0114] It is understandable that the intensity of the transmitted light can be adjusted through the aperture STO to improve the imaging quality. And by placing the aperture STO in front of each lens, the size of the entire lens can be reduced, realizing the miniaturization of the optical lens.

[0115] Optionally, the focal length of the first lens L1 satisfies the following relationship:

[0116] 1 ≤ f1 / F ≤ 3.5;

[0117] Wherein, f1 is the focal length of the first lens L1, and F is the focal length of the optical lens.

[0118] It is understandable that the first lens L1 has a relatively long focal length f1, which can collect more light for better convergence.

[0119] Optionally, the focal length of the second lens L2 satisfies the following relationship:

[0120] -2.5 ≤ f2 / F ≤ -1.5;

[0121] Wherein, f2 is the focal length of the second lens L2, and F is the focal length of the optical lens.

[0122] It can be understood that the second lens L2 with the above-mentioned focal length f2 can smoothly transition the light collected by the first lens L1 to the third lens L3.

[0123] Optionally, the focal length of the above-mentioned third lens L3 satisfies the following relationship:

[0124] 0.9 ≤ f3 / F ≤ 1.9;

[0125] where f3 is the focal length of the third lens L3, and F is the focal length of the optical lens.

[0126] It can be understood that the third lens L3 with the above-mentioned focal length f3 can better converge light, which is beneficial to reducing system aberration and distortion, thereby improving the resolution of the optical lens.

[0127] Optionally, the object side S10 and the image side S11 of the fourth lens L4 satisfy the following relationship:

[0128] 0.15 ≤ R1 / f4 ≤ 0.6, 0.15 ≤ R2 / f4 ≤ 0.6;

[0129] where R1 is the radius of curvature of the object side S10 of the fourth lens L4, R2 is the radius of curvature of the image side S11 of the fourth lens L4, and f4 is the focal length of the fourth lens L4.

[0130] It can be understood that the fourth lens L4 with the above-mentioned focal length f4 and the radius of curvature R1 and R2 can quickly converge the light collected in the front to the rear optical system.

[0131] Optionally, the focal length of the above-mentioned optical lens satisfies the following relationship:

[0132] 1.5 ≤ T / F ≤ 2.5;

[0133] where T is the distance from the center of the object side S4 of the first lens L1 to the imaging surface S12 of the optical lens on the optical axis, and F is the focal length of the optical lens.

[0134] It can be understood that the optical lens with the above-mentioned focal length F can reduce the size of the entire lens and achieve miniaturization of the optical lens.

[0135] In summary, from the optical lenses described in the above Figure 1 related embodiments, it can be known the path of the light from the object reaching the imaging surface S14 of the imaging sensor L6.

[0136] Specifically, reference can be made to Figure 2 , Figure 2 which is a schematic diagram of the light path provided by the embodiment of the present application.

[0137] As shown in Figure 2As shown, the light from the object sequentially passes through the object side S1 and the image side S2 of the filter L5, the stop STO, the object side S4 and the image side S5 of the first lens L1, the object side S6 and the image side S7 of the second lens L2, the object side S8 and the image side S9 of the third lens L3, the object side S10 and the image side S11 of the fourth lens L4, the front surface S12 and the rear surface S13 of the protective glass of the imaging sensor L6, and finally forms an image on the imaging surface S14 of the imaging sensor L6.

[0138] It can be understood that Figure 2 the light rays shown pass through Figure 1 the path of the optical lens shown reaching the imaging surface is shown only by way of example and is not drawn to scale, so the embodiments of the present application should not be limited thereby.

[0139] Optionally, the parameter information (curvature radius, thickness / spacing, refractive index, and scattering coefficient) of each component of the above Figure 1 shown optical lens can be as shown in Table 1 below:

[0140] Table 1

[0141] Serial number (S) Radius of curvature (mm) Thickness / Spacing (mm) Refractive index nd Dispersion coefficient (Abbe number vd) 1 Infinity 1.10 1.52 64.21 2 Infinity 1.45 STO Infinity -0.50 4 12.73 4.46 1.62 63.41 5 141.07 4.09 6 -50.35 1.58 1.81 41.02 7 40.10 3.89 8 -8.80 5.51 1.81 40.92 9 -8.19 0.25 10 9.18 5.51 1.90 31.31 11 9.55 5.65 12 Infinity 0.50 1.46 67.82 13 Infinity 0.1 14 Infinity

[0142] Among them, the above serial number 1 represents the object side of the filter L5, serial number 2 represents the image side of the filter L5, serial number STO represents the stop, serial number 4 represents the object side of the first lens L1, serial number 5 represents the image side of the first lens L1, serial number 6 represents the object side of the second lens L2, serial number 7 represents the image side of the second lens L2, serial number 8 represents the object side of the third lens L3, serial number 9 represents the image side of the third lens L3, serial number 10 represents the object side of the fourth lens L4, serial number 11 represents the image side of the fourth lens L4, serial number 12 represents the front surface of the protective glass of the imaging sensor L6, serial number 13 represents the rear surface of the protective glass of the imaging sensor L6, and serial number 14 represents the imaging surface of the imaging sensor L6.

[0143] The surface shape (z) of the third lens L3 can satisfy the following formula:

[0144]

[0145] where z is the distance sag from the vertex of the aspheric surface at a position with a height of r along the optical axis direction, c is the paraxial curvature of the aspheric surface, c = 1 / R, R is the radius of curvature, k is the conic coefficient, and a4, a6, a8, a 10 etc. are the coefficients of the higher-order terms and can be set according to the coefficients shown in Table 2 below:

[0146] Table 2

[0147] Serial number (S) k <![CDATA[a4]]> <![CDATA[a6]]> <![CDATA[a8]]> <![CDATA[a 10 > 8 5.99E-01 -2.373849E-05 -4.280217E-06 -7.110460E-08 -1.422097E-09 9 -4.76E-01 -5.056678E-05 -1.610098E-06 9.568527E-08 -2.144324E-10

[0148] Please refer to Figure 3 , Figure 3 which is a schematic structural diagram of an optical lens provided by an embodiment of the present application.

[0149] As Figure 3 shown, the optical lens includes:

[0150] A first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 that are coaxially arranged in sequence from the object side to the image side.

[0151] Among them, the first lens L1, the third lens L3, and the fourth lens L4 have positive optical powers, and the second lens L2 has a negative optical power.

[0152] The first lens L1 is a biconvex lens, the second lens L2 is a biconcave lens, the third lens L3 is a meniscus lens, and the fourth lens L4 is a meniscus lens.

[0153] It can be understood that the first lens L1 in the optical lens is a biconvex lens with a positive optical power, which can collect light rays in the field of view as much as possible, enable more light rays to enter the rear optical system, and is beneficial to reducing the lens aperture of the second lens L2.

[0154] The second lens L2 in the optical lens is a biconcave lens with a negative optical power, which is beneficial to smoothly transitioning the light rays collected by the first lens L1 to the third lens L3 and is beneficial to increasing the DOF of the optical lens.

[0155] The third lens L3 in the optical lens is a meniscus lens with a positive optical power, which can converge light rays better, is beneficial to reducing system aberration and distortion, and thus improving the resolution of the optical lens.

[0156] The fourth lens L4 in the optical lens is a meniscus lens with a positive optical power, which can quickly converge the light rays collected in the front to the rear optical system.

[0157] In the embodiment of the present application, an optical architecture of four lenses (L1, L2, L3, L4) is adopted. By setting the shapes of the four lenses and the reasonable distribution of the optical powers, the system aberration introduced by a large aperture can be reduced, thereby achieving high resolution performance of the optical lens under a large aperture.

[0158] In a possible embodiment, the object side surface S1 of the first lens L1 is a convex surface, and the image side surface S2 of the first lens L1 is a convex surface.

[0159] In the embodiments of the present application, the first lens L1 is set as a double-convex lens with a positive optical power, which can collect the light in the field of view as much as possible, enable more light to enter the rear optical system, and is beneficial to reducing the lens aperture of the second lens L2.

[0160] Optionally, the material of the first lens L1 includes a first material, which is used to suppress the temperature drift of the first lens L1.

[0161] Exemplarily, the first material may include, but is not limited to, at least one of the following: glass of model H-ZPK1A, glass of model H-FK61.

[0162] Through the embodiments of the present application, the temperature drift resistance of the first lens L1 can be improved.

[0163] In a possible embodiment, the object side surface S6 of the second lens L2 is concave, and the image side surface S7 of the second lens L2 is concave.

[0164] In the embodiments of the present application, by setting the second lens L2 as a double-concave lens with a negative optical power, the light collected by the first lens L1 can be smoothly transitioned to the third lens L3, which is beneficial to increasing the DOF of the optical lens, improving the yield of each lens assembly, and ensuring the sensitivity of the lens.

[0165] In a possible embodiment, the object side surface S8 of the third lens L3 is concave, and the image side surface S9 of the third lens L3 is convex.

[0166] In the embodiments of the present application, by setting the third lens L3 as a meniscus lens with a positive optical power and the convex surface facing the image side, the light can be better converged, which is beneficial to reducing the system aberration and distortion, thereby improving the resolution of the optical lens.

[0167] In a possible embodiment, the object side surface S10 of the fourth lens L4 is convex, and the image side surface S11 of the fourth lens L4 is concave.

[0168] In the embodiments of the present application, by setting the fourth lens L4 as a meniscus lens with a positive optical power and the convex surface facing the object side, the light collected in the front can be quickly converged to the rear optical system (for example, the imaging sensor L6).

[0169] It should be understood that in the embodiments of the present application, the surface of each lens closest to the object is called the object side surface, and the surface of each lens closest to the imaging surface is called the image side surface, which will not be elaborated hereinafter.

[0170] In a possible embodiment, the first lens L1 is an aspherical lens, and the third lens L3 is an aspherical lens.

[0171] It is understandable that the aspherical lens is characterized by a continuously changing curvature from the center to the periphery of the lens. Different from the spherical lens with a constant curvature from the center to the periphery of the lens, the aspherical lens has better curvature radius characteristics, greater freedom, and has the advantages of improving distortion aberration and astigmatism aberration.

[0172] Therefore, after the first lens L1 and the third lens L3 in the embodiments of the present application adopt aspherical lenses, the effect of converging light is better, and the aberration that appears during imaging can be eliminated as much as possible, thereby improving the imaging quality of the optical lens.

[0173] In a possible embodiment, the optical lens may further include:

[0174] Filter L5.

[0175] The filter L5 is located on the image side of the first lens L1 and the object side of the second lens L2.

[0176] It is understandable that the filter L5 is a colored transparent sheet that has the functions of absorbing, reflecting, and transmitting colored light, and can filter unnecessary noise from the light before entering the second lens L2 and correct color deviation. Moreover, the filter L5 is built into the lens of the optical lens, which can make the light passing aperture smaller and is beneficial to optimizing the assembly cost of each lens.

[0177] Optionally, the optical lens may further include:

[0178] Diaphragm STO.

[0179] The diaphragm STO is disposed between the first lens L1 and the filter L5.

[0180] It is understandable that the intensity of the light passing through can be adjusted by the diaphragm STO to improve the imaging quality.

[0181] Optionally, the focal length of the first lens L1 satisfies the following relationship:

[0182] 1≤f1 / F≤3.5;

[0183] Wherein, f1 is the focal length of the first lens L1, and F is the focal length of the optical lens.

[0184] It is understandable that the first lens L1 has a longer focal length f1, which can collect more light for better convergence.

[0185] Optionally, the focal length of the second lens L2 satisfies the following relationship:

[0186] -2.5≤f2 / F≤-1.5;

[0187] Among them, f2 is the focal length of the second lens L2, and F is the focal length of the optical lens.

[0188] It can be understood that the second lens L2 with the above-mentioned focal length f2 can smoothly transition the light collected by the first lens L1 to the third lens L3.

[0189] Optionally, the focal length of the above-mentioned third lens L3 satisfies the following relationship:

[0190] 0.9 ≤ f3 / F ≤ 1.9;

[0191] Among them, f3 is the focal length of the third lens L3, and F is the focal length of the optical lens.

[0192] It can be understood that the third lens L3 with the above-mentioned focal length f3 can better converge light, which is beneficial to reducing system aberration and distortion, thereby improving the resolution of the optical lens.

[0193] Optionally, the object side S10 and the image side S11 of the fourth lens L4 satisfy the following relationship:

[0194] 0.15 ≤ R1 / f4 ≤ 0.6, 0.15 ≤ R2 / f4 ≤ 0.6;

[0195] Among them, R1 is the curvature radius of the object side S10 of the fourth lens L4, R2 is the curvature radius of the image side S11 of the fourth lens L4, and f4 is the focal length of the fourth lens L4.

[0196] It can be understood that the fourth lens L4 with the above-mentioned focal length f4 and curvature radii R1 and R2 can quickly converge the light collected from the front to the rear optical system.

[0197] Optionally, the focal length of the above-mentioned optical lens satisfies the following relationship:

[0198] 1.5 ≤ T / F ≤ 2.5;

[0199] Among them, T is the distance from the center of the object side S4 of the first lens L1 to the imaging surface S12 of the optical lens on the optical axis, and F is the focal length of the optical lens.

[0200] It can be understood that the optical lens with the above-mentioned focal length F can reduce the size of the entire lens and realize the miniaturization of the optical lens.

[0201] In summary, from the optical lenses described in the above Figure 3 related embodiments, it can be known the path of light from an object reaching the imaging surface S14 of the imaging sensor L6.

[0202] Specifically, reference can be made to Figure 4 , Figure 4 which is a schematic diagram of an optical path provided by an embodiment of the present application.

[0203] As shown Figure 4 in the figure, the light from the object sequentially passes through the object side S1 and the image side S2 of the first lens L1, the stop STO, the object side S4 and the image side S5 of the filter L5, the object side S6 and the image side S7 of the second lens L2, the object side S8 and the image side S9 of the third lens L3, the object side S10 and the image side S11 of the fourth lens L4, the front surface S12 and the rear surface S13 of the protective glass of the imaging sensor L6, and finally forms an image on the imaging surface S14 of the imaging sensor L6.

[0204] It can be understood that Figure 4 the path of the light passing through the Figure 3 optical lens shown to reach the imaging surface is only shown by way of example and is not drawn to scale, so the embodiments of the present application should not be limited thereby.

[0205] Optionally, the parameter information (curvature radius, thickness / spacing, refractive index, and scattering coefficient) of each component of the above Figure 3 shown optical lens can be as shown in Table 3 below:

[0206] Table 3

[0207] Serial number (S) Radius of curvature (mm) Thickness / Spacing (mm) Refractive index nd Dispersion coefficient (Abbe number vd) 1 13.26 4.83 1.49 72.33 2 -97.94 0.20 STO Infinity 6.28 4 Infinity 1.10 1.52 64.21 5 Infinity 4.16 6 -14.18 1.6 1.59 61.25 7 15.80 2.22 8 -68.09 3.43 1.81 40.92 9 -14.43 0.43 10 10.77 4.50 2.00 25.44 11 13.88 4.95 12 Infinity 0.50 1.46 67.82 13 Infinity 0.435 14 Infinity

[0208] Among them, the above serial number 1 represents the object side of the first lens L1, the serial number 2 represents the image side of the first lens L1, the serial number STO represents the stop, the serial number 4 represents the object side of the filter L5, the serial number 5 represents the image side of the filter L5, the serial number 6 represents the object side of the second lens L2, the serial number 7 represents the image side of the second lens L2, the serial number 8 represents the object side of the third lens L3, the serial number 9 represents the image side of the third lens L3, the serial number 10 represents the object side of the fourth lens L4, the serial number 11 represents the image side of the fourth lens L4, the serial number 12 represents the front surface of the protective glass of the imaging sensor L6, the serial number 13 represents the rear surface of the protective glass of the imaging sensor L6, and the serial number 14 represents the imaging surface of the imaging sensor L6.

[0209] The surface shape (z) of the first lens L1 and the third lens L3 can satisfy the following formula:

[0210]

[0211] Among them, z is the distance sagitta from the vertex of the aspheric surface at the position with a height of r along the optical axis direction of the aspheric surface, c is the paraxial curvature of the aspheric surface, c = 1 / R, R is the curvature radius, k is the conic coefficient, and a4, a6, a8, etc. are the coefficients of the higher-order terms, and can be set according to the coefficients shown in Table 4 below:

[0212] Table 4

[0213] Serial number (S) k <![CDATA[a4]]> <![CDATA[a6]]> <![CDATA[a8]]> 1 -2.51E+00 1.224662E-05 -9.758264E-08 0.000000E+00 2 9.30E+01 4.387810E-05 0.000000E+00 0.000000E+00 8 9.35E+01 6.675373E-05 4.7.7450E-07 -6.439149E-08 9 2.16E+00 1.139956E-05 4.364800E-07 -2.691282E-08

[0214] Please refer to Figure 5 , Figure 5 , which is a schematic structural diagram of an optical lens provided by an embodiment of the present application.

[0215] As Figure 5 shown, the optical lens includes:

[0216] A first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 that are coaxially arranged in sequence from the object side to the image side.

[0217] Among them, the first lens L1, the third lens L3, and the fourth lens L4 have positive optical powers, and the second lens L2 has a negative optical power.

[0218] The first lens L1 is a plano-convex lens, the second lens L2 is a meniscus lens, the third lens L3 is a meniscus lens, and the fourth lens L4 is a meniscus lens.

[0219] It can be understood that the first lens L1 in the optical lens is a plano-convex lens with positive optical power, which can collect the light in the field of view as much as possible, enable more light to enter the rear optical system, and is beneficial to reducing the lens aperture of the second lens L2.

[0220] The second lens L2 in the optical lens is a meniscus lens with negative optical power, which is beneficial to smoothly transition the light collected by the first lens L1 to the third lens L3 and is beneficial to increasing the depth of field DOF of the optical lens.

[0221] The third lens L3 in the optical lens is a meniscus lens with positive optical power, which can converge the light better, is beneficial to reducing the system aberration and distortion, and thus improving the resolution of the optical lens.

[0222] The fourth lens L4 in the optical lens is a meniscus lens with positive optical power, which can quickly converge the light collected in the front to the rear optical system.

[0223] In an embodiment of the present application, an optical architecture of four lenses (L1, L2, L3, L4) is adopted. By setting the shapes of the four lenses and reasonably distributing the optical powers, the system aberration introduced by a large aperture can be reduced, thereby achieving high-resolution performance of the optical lens under a large aperture.

[0224] In a possible embodiment, the object side surface S3 of the first lens L1 is a convex surface, and the image side surface STO of the first lens L1 is a plane.

[0225] Through the embodiments of the present application, the first lens L1 is set as a positive focal length lens in the form of a plano-convex lens with the convex surface facing the object side, which can collect the light within the field of view as much as possible, enable more light to enter the rear optical system, and is beneficial to reducing the lens aperture of the second lens L2.

[0226] Optionally, the material of the first lens L1 includes a first material, which is used to suppress the temperature drift of the first lens L1.

[0227] Exemplarily, the first material may include but is not limited to at least one of the following: glass of model H-ZPK1A, glass of model H-FK61.

[0228] Through the embodiments of the present application, the temperature drift resistance of the first lens L1 can be improved.

[0229] In a possible embodiment, the object side surface S5 of the second lens L2 is concave, and the image side surface S6 of the second lens L2 is convex.

[0230] Through the embodiments of the present application, the second lens L2 is set as a negative focal length lens with the convex surface facing the image side, which can smoothly transition the light collected by the first lens L1 to the third lens L3, and is beneficial to increasing the DOF of the optical lens, improving the yield rate of each lens assembly, and ensuring the sensitivity of the lens.

[0231] In a possible embodiment, the object side surface S7 of the third lens L3 is concave, and the image side surface S8 of the third lens L3 is convex.

[0232] Through the embodiments of the present application, the third lens L3 is set as a meniscus positive focal length lens with the convex surface facing the image side, which can converge the light better, is beneficial to reducing the system aberration and distortion, and thus improving the resolution of the optical lens.

[0233] In a possible embodiment, the object side surface S9 of the fourth lens L4 is convex, and the image side surface S10 of the fourth lens L4 is concave.

[0234] Through the embodiments of the present application, the fourth lens L4 is set as a meniscus positive focal length lens with the convex surface facing the object side, which can quickly converge the light collected in the front to the rear optical system (for example, the imaging sensor L6).

[0235] It should be understood that in the embodiments of the present application, the surface of each lens closest to the object is called the object side surface, and the surface of each lens closest to the imaging surface is called the image side surface, which will not be elaborated hereinafter.

[0236] In a possible embodiment, the third lens L3 is an aspherical lens, and the fourth lens L4 is an aspherical lens.

[0237] It can be understood that the aspherical lens is characterized by a continuously changing curvature from the center to the periphery of the lens. Different from the spherical lens with a constant curvature from the center to the periphery of the lens, the aspherical lens has better curvature radius characteristics, greater freedom, and has the advantages of improving distortion aberration and astigmatism aberration.

[0238] Therefore, after the third lens L3 and the fourth lens L4 in the embodiments of the present application adopt aspherical lenses, the effect of converging light is better, and the aberration that appears during imaging can be eliminated as much as possible, thereby improving the imaging quality of the optical lens.

[0239] In a possible embodiment, the optical lens may further include:

[0240] A filter L5.

[0241] The filter L5 is located on the object side of the first lens L1.

[0242] It can be understood that the filter L5 is a colored transparent sheet that has the functions of absorbing, reflecting, and transmitting colored light, and can filter unnecessary noise from the light before entering the first lens L1 and correct color deviation.

[0243] Optionally, the optical lens may further include:

[0244] An aperture STO.

[0245] The aperture STO is disposed on the image side of the first lens L1, that is, the image side of the first lens L1 and the aperture STO are coplanar.

[0246] It can be understood that the intensity of the light passing through can be adjusted through the aperture STO to improve the imaging quality.

[0247] Optionally, the focal length of the first lens L1 satisfies the following relationship:

[0248] 1≤f1 / F≤3.5;

[0249] Wherein, f1 is the focal length of the first lens L1, and F is the focal length of the optical lens.

[0250] It can be understood that the first lens L1 has a relatively long focal length f1, and can collect more light for better convergence.

[0251] Optionally, the focal length of the second lens L2 satisfies the following relationship:

[0252] -2.5≤f2 / F≤-1.5;

[0253] Wherein, f2 is the focal length of the second lens L2, and F is the focal length of the optical lens.

[0254] It is understandable that the second lens L2 with the above-mentioned focal length f2 can smoothly transition the light rays collected by the first lens L1 to the third lens L3.

[0255] Optionally, the focal length of the above-mentioned third lens L3 satisfies the following relationship:

[0256] 0.9 ≤ f3 / F ≤ 1.9;

[0257] Wherein, f3 is the focal length of the third lens L3, and F is the focal length of the optical lens.

[0258] It is understandable that the third lens L3 with the above-mentioned focal length f3 can converge light rays better, which is beneficial to reducing system aberration and distortion, thereby improving the resolution of the optical lens.

[0259] Optionally, the object side S10 and the image side S11 of the fourth lens L4 satisfy the following relationship:

[0260] 0.15 ≤ R1 / f4 ≤ 0.6, 0.15 ≤ R2 / f4 ≤ 0.6;

[0261] Wherein, R1 is the radius of curvature of the object side S9 of the fourth lens L4, R2 is the radius of curvature of the image side S10 of the fourth lens L4, and f4 is the focal length of the fourth lens L4.

[0262] It is understandable that the fourth lens L4 with the above-mentioned focal length f4 and the radius of curvature R1 and R2 can quickly converge the light rays collected in the front to the rear optical system.

[0263] Optionally, the focal length of the above-mentioned optical lens satisfies the following relationship:

[0264] 1.5 ≤ T / F ≤ 2.5;

[0265] Wherein, T is the distance from the center of the object side S1 of the first lens L1 to the imaging surface S12 of the optical lens on the optical axis, and F is the focal length of the optical lens.

[0266] It is understandable that the optical lens with the above-mentioned focal length F can reduce the size of the entire lens and realize the miniaturization of the optical lens.

[0267] In summary, from the optical lenses described in the above Figure 5 related embodiments, it can be known the path of the light from the object reaching the imaging surface S14 of the imaging sensor L6.

[0268] Specifically, reference can be made to Figure 6 , Figure 6 which is a schematic diagram of a light path provided by an embodiment of the present application.

[0269] As Figure 6As shown, the light from the object sequentially passes through the object side S1 and the image side S2 of the filter L5, the object side S3 and the image side STO of the first lens L1, the object side S5 and the image side S6 of the second lens L2, the object side S7 and the image side S8 of the third lens L3, the object side S9 and the image side S10 of the fourth lens L4, the front surface S11 and the rear surface S12 of the protective glass of the imaging sensor L6, and finally forms an image on the imaging surface S11 of the imaging sensor L6.

[0270] It can be understood that Figure 6 the light rays shown pass through Figure 5 the path of the optical lens shown reaching the imaging surface is shown only by way of example and is not drawn to scale strictly, so the embodiments of the present application should not be limited thereby.

[0271] Optionally, the parameter information (curvature radius, thickness / spacing, refractive index, and scattering coefficient) of each component of the above Figure 5 shown optical lens can be as shown in Table 5 below:

[0272] Table 5

[0273] Serial number (S) Radius of curvature (mm) Thickness / Spacing (mm) Refractive index nd Dispersion coefficient (Abbe number vd) 1 Infinity 1.10 1.52 64.21 2 Infinity 0.40 3 14.74 1.94 1.50 81.59 STO Infinity 3.97 5 -7.67 4.73 1.83 37.23 6 -17.11 0.43 7 -46.07 4.56 1.81 40.97 8 -10.30 0.19 9 7.67 5.55 1.81 40.97 10 6.89 4.81 11 Infinity 0.50 1.46 67.82 12 Infinity 0.10 13 Infinity

[0274] Among them, the above serial number 1 represents the object side of the filter L5, serial number 2 represents the image side of the filter L5, serial number 3 represents the object side of the first lens L1, serial number STO represents the image side of the first lens L1. Optionally, serial number STO also represents the aperture stop. Serial number 5 represents the object side of the second lens L2, serial number 6 represents the image side of the second lens L2, serial number 7 represents the object side of the third lens L3, serial number 8 represents the image side of the third lens L3, serial number 9 represents the object side of the fourth lens L4, serial number 10 represents the image side of the fourth lens L4, serial number 11 represents the front surface of the protective glass of the imaging sensor L6, serial number 12 represents the rear surface of the protective glass of the imaging sensor L6, and serial number 13 represents the imaging surface of the imaging sensor L6.

[0275] The surface shape (z) of the third lens L3 and the fourth lens L4 can satisfy the following formula:

[0276]

[0277] where z is the distance sagitta from the vertex of the aspheric surface at the position with a height of r along the optical axis direction, c is the paraxial curvature of the aspheric surface, c = 1 / R, R is the curvature radius, k is the conic coefficient, and a4, a6, a8, a 10 、a 12 etc. are high-order term coefficients and can be set according to the coefficients shown in Table 6 below:

[0278] Table 6

[0279]

[0280] Optionally, in combination with the comparison of the above Figures 1 to 5 shown optical lenses, the following Table VII can be obtained:

[0281] Table VII

[0282]

[0283] It should be understood that the above Figure 1 、 Figure 3 、 Figure 5 shown optical lenses are only used to illustrate the optical lenses proposed in this application as three possible exemplary structures, and should not be used to limit the embodiments of this application. Based on the above Figure 1 、 Figure 3 、 Figure 5 new optical lenses obtained by reasonable deformation, supplement or combination of the shown optical lenses all fall within the protection scope of this application.

[0284] Correspondingly, the embodiments of this application also provide an optical imaging device, which includes the optical lenses described in the above-mentioned various embodiments.

[0285] Optionally, the optical imaging device may further include:

[0286] Imaging sensor L6.

[0287] Optionally, the optical imaging device may be a lidar, a camera device (such as a security black light camera), or the like.

[0288] Optionally, the optical lenses described in the above-mentioned various embodiments may also be applied to other optical imaging devices that need to receive light, and the embodiments of this application do not limit this.

[0289] This application also provides a terminal device, which includes the optical lens or the optical imaging device provided by this application. For example, the terminal device may be a transportation vehicle, such as a vehicle, a truck, an aircraft, a drone, a slow transport vehicle, a spacecraft, or a ship, or any other transportation vehicle used in possible scenarios, or may also be a surveying and mapping device or any other device that can carry a detection device. One or more optical lenses or optical imaging devices provided by this application are deployed on the terminal device.

[0290] The above are only the specific embodiments of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application, and all should be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

1. An optical lens, characterized in that, Comprising: A first lens, a second lens, a third lens, and a fourth lens that are coaxially arranged in sequence from the object side to the image side; The first lens, the third lens, and the fourth lens have positive optical powers, and the second lens has a negative optical power; The first lens is a meniscus lens, the second lens is a biconcave lens, the third lens is a meniscus lens, and the fourth lens is a meniscus lens.

2. The optical lens according to claim 1, wherein The object side surface of the first lens is convex, and the image side surface of the first lens is concave; the object side surface of the second lens is concave, and the image side surface of the second lens is concave; the object side surface of the third lens is concave, and the image side surface of the third lens is convex; the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is concave.

3. The optical lens according to claim 1 or 2, characterized in that, The third lens is an aspherical lens.

4. The optical lens according to any one of claims 1 to 3, characterized in that, The optical lens further comprises: A filter; The filter is located on the object side of the first lens.

5. An optical lens, characterized in that, Comprising: A first lens, a second lens, a third lens, and a fourth lens that are coaxially arranged in sequence from the object side to the image side; The first lens, the third lens, and the fourth lens have positive optical powers, and the second lens has a negative optical power; The first lens is a biconvex lens, the second lens is a biconcave lens, the third lens is a meniscus lens, and the fourth lens is a meniscus lens.

6. The optical lens according to claim 5, characterized in that, The object side surface of the first lens is convex, and the image side surface of the first lens is convex; the object side surface of the second lens is concave, and the image side surface of the second lens is concave; the object side surface of the third lens is concave, and the image side surface of the third lens is convex; the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is concave.

7. The optical lens according to claim 5 or 6, characterized in that, The first lens is an aspherical lens, and the third lens is an aspherical lens.

8. The optical lens according to any one of claims 5 to 7, characterized in that, The optical lens further comprises: A filter; The filter is located on the image side of the first lens and the object side of the second lens.

9. An optical lens, characterized in that, Comprising: A first lens, a second lens, a third lens, and a fourth lens that are coaxially arranged in sequence from the object side to the image side; The first lens, the third lens, and the fourth lens have positive optical powers, and the second lens has a negative optical power; The first lens is a plano-convex lens, the second lens is a meniscus lens, the third lens is a meniscus lens, and the fourth lens is a meniscus lens.

10. The optical lens according to claim 9, characterized in that, The object side surface of the first lens is convex, and the image side surface of the first lens is flat; the object side surface of the second lens is concave, and the image side surface of the second lens is convex; the object side surface of the third lens is concave, and the image side surface of the third lens is convex; the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is concave.

11. The optical lens according to claim 9 or 10, characterized in that, The third lens is an aspherical lens, and the fourth lens is an aspherical lens.

12. The optical lens according to any one of claims 9 to 11, characterized in that, The optical lens further comprises: A filter; The filter is located on the object side of the first lens.

13. The optical lens according to any one of claims 1 to 12, characterized in that, The focal length of the first lens satisfies the following relationship: 1 ≤ f1 / F ≤ 3.5; Wherein, f1 is the focal length of the first lens, and F is the focal length of the optical lens.

14. The optical lens according to any one of claims 1 to 13, characterized in that, The material of the first lens includes a first material, and the first material is used to suppress the temperature drift of the first lens.

15. The optical lens according to any one of claims 1 to 14, characterized in that, The focal length of the second lens satisfies the following relationship: -2.5 ≤ f2 / F ≤ -1.5; where f2 is the focal length of the second lens, and F is the focal length of the optical lens.

16. The optical lens according to any one of claims 1 to 15, characterized in that, The focal length of the third lens satisfies the following relationship: 0.9 ≤ f3 / F ≤ 1.9; where f3 is the focal length of the third lens, and F is the focal length of the optical lens.

17. The optical lens according to any one of claims 1 to 16, characterized in that, The object side and the image side of the fourth lens satisfy the following relationship: 0.15 ≤ R1 / f4 ≤ 0.6, 0.15 ≤ R2 / f4 ≤ 0.6; where R1 is the radius of curvature of the object side of the fourth lens, R2 is the radius of curvature of the image side of the fourth lens, and f4 is the focal length of the fourth lens.

18. The optical lens according to any one of claims 1 to 17, characterized in that, The focal length of the optical lens satisfies the following relationship: 1.5 ≤ T / F ≤ 2.5; where T is the distance from the center of the object side of the first lens to the imaging surface of the optical lens on the optical axis, and F is the focal length of the optical lens.

19. An optical imaging device, characterized in that, comprising the optical lens according to any one of claims 1 to 18, and an imaging sensor.

20. The optical imaging device according to claim 19, wherein, The optical imaging device includes at least one of the following: a lidar, a camera device.

21. A car end, characterized in that, The vehicle end includes the optical lens according to any one of claims 1 to 18, or the optical imaging device according to any one of claims 19 to 20.

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