Optical lens assembly and optical imaging apparatus

Abstract

n optical lens assembly and an optical imaging apparatus are provided. The optical lens assembly includes: a first lens (L1), a second lens (L2), a third lens (L3), and a fourth lens (L4) that are sequentially coaxially disposed from an object side to an image side. The first lens (L1), the third lens (L3), and the fourth lens (L4) have positive focal power, and the second lens (L2) has negative focal power; and the first lens (L1) is a meniscus lens, the second lens (L2) is a double-concave lens, the third lens (L3) is a meniscus lens, and the fourth lens (L4) is a meniscus lens. The optical lens assembly uses an optical architecture of four lenses (L1, L2, L3, and L4). The four lenses (L1, L2, L3, and L4) are shaped and focal power is appropriately allocated, so that a system aberration introduced by a wide aperture can be reduced, to implement high image resolution performance of the optical lens assembly in the wide aperture.

Description

Optical lens and optical imaging device

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on December 28, 2023, with application number 202311848579.2 and application name “Optical lens and optical imaging device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of optical imaging technology, and in particular to an optical lens and an optical imaging device. Background Art

[0003] The aperture is a device that controls the amount of light that passes through the lens and reaches the camera's photosensitive surface. Generally speaking, the size of the aperture is determined by the lens's aperture and focal length. The larger the lens's aperture, the more light enters per unit time, the richer the information the photosensitive element receives, and the better the final image quality.

[0004] However, large aperture design often increases the complexity of optical system design and introduces larger system aberrations.

[0005] Therefore, how to reduce the aberration introduced by a large aperture is a hot topic currently being studied by those skilled in the art. Summary of the Invention

[0006] The embodiments of the present application provide an optical lens and an optical imaging device that can reduce the aberration introduced by a large aperture.

[0007] In a first aspect, an embodiment of the present application provides an optical lens, the optical lens comprising:

[0008] 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;

[0009] The first lens, the third lens and the fourth lens have positive refractive power, and the second lens has negative refractive power;

[0010] 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.

[0011] In an embodiment of the present application, an optical lens is provided, wherein the first lens in the optical lens is a meniscus lens with positive focal length, which can collect light in the field of view as much as possible, allowing more light to enter the rear optical system, and is conducive to reducing the lens diameter of the second lens; the second lens in the optical lens is a biconcave lens with negative focal length, which is conducive to smoothly transitioning the light collected by the first lens to the third lens, and is conducive to increasing the depth of field (DOF) of the optical lens; the third lens in the optical lens is a meniscus lens with positive focal length, which can better converge light, is conducive to reducing system aberrations and distortion, thereby improving the resolution of the optical lens; the fourth lens in the optical lens is a meniscus lens with positive focal length, 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 the reasonable distribution of focal length, the system aberrations introduced by the large aperture can be reduced, thereby achieving high resolution performance of the optical lens at a large aperture, and the volume of the optical lens can be reduced.

[0012] In one possible implementation, 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.

[0013] In an embodiment of the present application, a possible specific implementation of a first lens, a second lens, a third lens, and a 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 lens with a convex surface facing the object side and a positive optical focal length, the light in the field of view can be collected as much as possible, so that more light enters the rear optical system, and it is beneficial to reduce the lens diameter 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 lens with a negative optical focal length, the light collected by the first lens can be smoothly transferred to the third lens, and it is beneficial to increase the DOF of the optical lens, improve the yield rate of each lens assembly, and ensure 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 lens with a convex surface facing the image side and a positive optical focal length, the light can be better converged, which is beneficial to reduce system aberrations 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.

[0014] In a possible implementation, the third lens is an aspherical lens.

[0015] In an embodiment of the present application, a possible specific implementation of the third lens is provided. Specifically, the third lens is an aspherical lens. Aspherical lenses are characterized by a continuously varying curvature from the center to the periphery. Unlike spherical lenses, which have a constant curvature from the center to the periphery, aspherical lenses have a better curvature radius characteristic, greater degrees of freedom, and the advantages of improving distortion and astigmatism. When an aspherical third lens is used, it better converges light and minimizes aberrations that occur during imaging, thereby improving the imaging quality of the optical lens.

[0016] In a possible implementation, the optical lens further includes:

[0017] optical filters;

[0018] The filter is located on the object side of the first lens.

[0019] 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 located on the object side of a first lens. The filter is a colored transparent sheet that absorbs, reflects, and transmits colored light. It can filter unnecessary noise from light entering the first lens and correct color deviation.

[0020] In a second aspect, an embodiment of the present application provides an optical lens, the optical lens comprising:

[0021] 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;

[0022] The first lens, the third lens and the fourth lens have positive refractive power, and the second lens has negative refractive power;

[0023] 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.

[0024] In an embodiment of the present application, an optical lens is provided, wherein the first lens in the optical lens is a biconvex lens with positive focal length, which can collect light within the field of view as much as possible, allowing more light to enter the rear optical system, and is conducive to reducing the lens diameter of the second lens; the second lens in the optical lens is a biconcave lens with negative focal length, which is conducive to smoothly transitioning the light collected by the first lens to the third lens, and is conducive to increasing the depth of field DOF of the optical lens; the third lens in the optical lens is a meniscus lens with positive focal length, which can better converge light, is conducive to reducing system aberrations and distortion, thereby improving the resolution of the optical lens; the fourth lens in the optical lens is a meniscus lens with positive focal length, 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 the reasonable distribution of focal length, the system aberrations introduced by the large aperture can be reduced, thereby achieving high resolution performance of the optical lens at a large aperture and reducing the volume of the optical lens.

[0025] In one possible implementation, 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.

[0026] In an embodiment of the present application, a possible specific implementation of a first lens, a second lens, a third lens, and a fourth lens is provided. Specifically, the object side surface of the first lens is convex, and the image side surface is convex. By setting the first lens as a biconvex positive optical power lens, the light in the field of view can be collected as much as possible, so that more light enters the rear optical system, and it is beneficial to reduce the lens diameter 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 transferred to the third lens, and it is beneficial to increase the DOF of the optical lens, improve the yield rate of each lens assembly, and ensure 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 better converged, which is beneficial to reduce system aberrations 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.

[0027] In a possible implementation, the first lens is an aspheric lens, and the third lens is an aspheric lens.

[0028] In an embodiment of the present application, a possible specific embodiment of the first and third lenses is provided. Specifically, the first lens is an aspherical lens, and the third lens is an aspherical lens. Aspherical lenses are characterized by a continuously changing curvature from the center to the periphery of the lens. Unlike spherical lenses, which have a constant curvature from the center to the periphery, aspherical lenses have a better curvature radius characteristic, greater degrees of freedom, and the advantages of improving distortion and astigmatism. When the first and third lenses are aspherical lenses, the light convergence effect is better and the aberrations that occur during imaging can be minimized, thereby improving the imaging quality of the optical lens.

[0029] In a possible implementation, the optical lens further includes:

[0030] optical filters;

[0031] The filter is located on the image side of the first lens and the object side of the second lens.

[0032] 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 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 absorbs, reflects, and transmits colored light. It can filter unnecessary noise from light entering the second lens and correct color deviation. Furthermore, the filter is built into the optical lens between the lenses, which can reduce the clear aperture, thereby reducing the material cost used to control the clear aperture.

[0033] In a third aspect, an embodiment of the present application provides an optical lens, the optical lens comprising:

[0034] 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;

[0035] The first lens, the third lens and the fourth lens have positive refractive power, and the second lens has negative refractive power;

[0036] 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.

[0037] In an embodiment of the present application, an optical lens is provided, wherein the first lens in the optical lens is a plano-convex lens with positive focal length, which can collect light within the field of view as much as possible, allowing more light to enter the rear optical system, and is conducive to reducing the lens diameter of the second lens; the second lens in the optical lens is a meniscus lens with negative focal length, which is conducive to smoothly transitioning the light collected by the first lens to the third lens, and is conducive to increasing the DOF of the optical lens; the third lens in the optical lens is a meniscus lens with positive focal length, which can better converge light, is conducive to reducing system aberrations and distortion, thereby improving the resolution of the optical lens; the fourth lens in the optical lens is a meniscus lens with positive focal length, 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 the reasonable distribution of focal length, the system aberrations introduced by the large aperture can be reduced, thereby achieving high resolution performance of the optical lens at a large aperture and reducing the volume of the optical lens.

[0038] In one possible implementation, 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.

[0039] In an embodiment of the present application, a possible specific implementation of a first lens, a second lens, a third lens, and a fourth lens is provided. Specifically, the object side surface of the first lens is convex and the image side surface is flat. By setting the first lens as a plano-convex lens with a convex surface facing the object side and a positive optical focal length, the light in the field of view can be collected as much as possible, so that more light enters the rear optical system, and it is beneficial to reduce the lens diameter of the second lens. The object side surface of the second lens is concave and the image side surface is convex. By setting the second lens as a lens with a negative optical focal length with a convex surface facing the image side, the light collected by the first lens can be smoothly transferred to the third lens, and it is beneficial to increase the DOF of the optical lens, improve the yield rate of each lens assembly, and ensure 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 lens with a convex surface facing the image side, the light can be better converged, which is beneficial to reduce system aberrations 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.

[0040] In a possible implementation, the third lens is an aspheric lens, and the fourth lens is an aspheric lens.

[0041] In an embodiment of the present application, a possible specific implementation of the third and fourth lenses is provided. Specifically, the third and fourth lenses are aspherical lenses. Aspherical lenses are characterized by a continuously changing curvature from the center to the periphery. Unlike spherical lenses, which have a constant curvature from the center to the periphery, aspherical lenses have a better curvature radius characteristic, greater degrees of freedom, and the advantages of improving distortion and astigmatism. When aspherical lenses are used for the third and fourth lenses, the light converges more effectively and the aberrations that occur during imaging are minimized, thereby improving the imaging quality of the optical lens.

[0042] In a possible implementation, the optical lens further includes:

[0043] optical filters;

[0044] The filter is located on the object side of the first lens.

[0045] 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 located on the object side of a first lens. The filter is a colored transparent sheet that absorbs, reflects, and transmits colored light. It can filter unnecessary noise from light entering the first lens and correct color deviation.

[0046] In conjunction with the optical lens described in any one of the first to third aspects above, in a possible implementation manner, the focal length of the first lens satisfies the following relationship: 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] In conjunction with the optical lens described in any one of the first to third aspects above, in a possible implementation manner, the material of the first lens includes a first material, and the first material is used to suppress temperature drift of the first lens.

[0049] In conjunction with the optical lens described in any one of the first to third aspects above, in a possible implementation manner, the focal length of the second lens satisfies the following relationship: -2.5≤f2 / F≤-1.5;

[0050] Wherein, f2 is the focal length of the second lens, and F is the focal length of the optical lens.

[0051] In conjunction with the optical lens described in any one of the first to third aspects above, in a possible implementation manner, the focal length of the third lens satisfies the following relationship: 0.9≤f3 / F≤1.9;

[0052] Wherein, f3 is the focal length of the third lens, and F is the focal length of the optical lens.

[0053] In conjunction with the optical lens described in any one of the first to third aspects above, in one possible implementation, the object-side surface and the image-side surface of the fourth lens satisfy the following relationship: 0.15≤R1 / f4≤0.6, 0.15≤R2 / f4≤0.6;

[0054] Wherein, R1 is the curvature radius of the object side surface of the fourth lens, R2 is the curvature radius of the image side surface of the fourth lens, and f4 is the focal length of the fourth lens.

[0055] In conjunction with the optical lens described in any one of the first to third aspects above, in a possible implementation manner, the focal length of the optical lens satisfies the following relationship: 1.5≤T / F≤2.5;

[0056] Wherein, T is the distance from the center of the object-side surface 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.

[0057] In a fourth aspect, an embodiment of the present application provides an optical imaging device, which includes the optical lens described in any one of the first to third aspects above and any possible implementation manner.

[0058] Optionally, the optical imaging device may further include an imaging sensor.

[0059] Optionally, the optical imaging device may be a laser radar, a camera device or the like.

[0060] Optionally, the optical lens may also be applied to other optical imaging devices that need to receive light, which is not limited here.

[0061] In a fifth aspect, an embodiment of the present application provides a terminal device, which includes the optical lens described in any one of the first to third aspects above and any possible implementation method, or includes the optical imaging device described in the fourth aspect above.

[0062] In the sixth aspect, an embodiment of the present application provides a vehicle end, which includes the optical lens described in any aspect of the first to third aspects and any possible implementation method, or includes the optical imaging device described in the fourth aspect, or includes the terminal device described in the fifth aspect.

[0063] The embodiment of the present application adopts an optical architecture with four lenses. By setting the shapes of the four lenses and reasonably distributing the optical power, the system aberration introduced by the large aperture can be reduced, thereby achieving high resolution performance of the optical lens at a large aperture. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0065] FIG1 is a schematic structural diagram of an optical lens provided in an embodiment of the present application;

[0066] FIG2 is a schematic diagram of a light path provided in an embodiment of the present application;

[0067] FIG3 is a schematic structural diagram of an optical lens provided in an embodiment of the present application;

[0068] FIG4 is a schematic diagram of a light path provided in an embodiment of the present application;

[0069] FIG5 is a schematic structural diagram of an optical lens provided in an embodiment of the present application;

[0070] FIG6 is a schematic diagram of a light path provided in an embodiment of the present application. DETAILED DESCRIPTION

[0071] In order to make the purpose, technical solutions and advantages of this application clearer, the embodiments of this application will be described below in conjunction with the drawings in the embodiments of this application.

[0072] The terms "first" and "second" in the specification, claims, and drawings of this application are used to distinguish different objects, not to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. 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 may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to the process, method, product, or device.

[0073] The “embodiment” mentioned herein means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It can be understood explicitly and implicitly by those skilled in the art that in the various embodiments of the present application, unless otherwise specified and there is a logical conflict, the terms and / or descriptions between the various embodiments are consistent and can be referenced to each other, and the technical features in different embodiments can be combined to form a new embodiment according to their inherent logical relationship.

[0074] It should be understood that in the present application, "at least one (item)" refers to one or more, "more than one" refers to two or more, "at least two (items)" refers to two or three and more than three, and "and / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least 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.

[0075] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0076] As mentioned in the background technology section, current 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 large apertures.

[0077] The optical lens and optical imaging device provided in this application will be described below with reference to the accompanying drawings.

[0078] Please refer to FIG1 , which is a schematic structural diagram of an optical lens provided in an embodiment of the present application.

[0079] As shown in Figure 1, the optical lens includes:

[0080] The first lens L1, the second lens L2, the third lens L3 and the fourth lens L4 are coaxially arranged in sequence from the object side to the image side.

[0081] Among them, the first lens L1, the third lens L3 and the fourth lens L4 have positive refractive power, and the second lens L2 has negative refractive power.

[0082] 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.

[0083] It can be understood that the first lens L1 in the optical lens is a meniscus lens with positive optical power, which can collect light in the field of view as much as possible, allowing more light to enter the rear optical system, and is conducive to reducing the lens aperture of the second lens L2.

[0084] The second lens L2 in the optical lens is a biconcave lens with negative optical power, which is beneficial for smoothly transitioning the light collected by the first lens L1 to the third lens L3 and is beneficial for increasing the depth of field (DOF) of the optical lens.

[0085] The third lens L3 in the optical lens is a meniscus lens with positive optical power, which can better converge light, help reduce system aberrations and distortion, and thus improve the resolution of the optical lens.

[0086] The fourth lens L4 in this 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.

[0087] 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 reasonably distributing the optical focal length, the system aberration introduced by the large aperture can be reduced, thereby achieving high resolution performance of the optical lens at a large aperture.

[0088] 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.

[0089] According to the embodiment of the present application, the first lens L1 is configured as a meniscus-shaped lens with positive optical power and a convex surface facing the object side. This can collect as much light as possible within the field of view, allowing more light to enter the rear optical system and facilitating a reduction in the aperture of the second lens L2.

[0090] Optionally, the material of the first lens L1 includes a first material, and the first material is used to suppress temperature drift of the first lens L1.

[0091] Illustratively, 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.

[0092] Through the embodiments of the present application, the temperature drift resistance of the first lens L1 can be improved.

[0093] In a possible embodiment, the object-side surface S6 of the second lens L2 is a concave surface, and the image-side surface S7 of the second lens L2 is a concave surface.

[0094] Through the embodiment of the present application, the second lens L2 is set as a biconcave lens with negative optical power, which can smoothly transfer 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 of each lens assembly, and ensuring the sensitivity of the lens.

[0095] 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.

[0096] Through the embodiment of the present application, setting the third lens L3 as a meniscus-shaped lens with positive optical power and a convex surface facing the image side can better converge light, which is beneficial to reducing system aberrations and distortion, thereby improving the resolution of the optical lens.

[0097] 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.

[0098] Through the embodiment of the present application, the fourth lens L4 is set to be a meniscus-shaped lens with 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).

[0099] 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 described in detail below.

[0100] In a possible embodiment, the third lens L3 is an aspheric lens.

[0101] It can be understood that the characteristic of aspherical lenses is that the curvature changes continuously from the center of the lens to the periphery. Unlike spherical lenses with constant curvature from the center to the periphery of the lens, aspherical lenses have better curvature radius characteristics, greater freedom, and the advantages of improving distortion and astigmatism.

[0102] Therefore, after the third lens L3 in the embodiment of the present application adopts an aspherical lens, it has a better effect of converging light and can eliminate aberrations that occur during imaging as much as possible, thereby improving the imaging quality of the optical lens.

[0103] In a possible embodiment, the optical lens may further include:

[0104] Filter L5.

[0105] The filter L5 is located on the object side of the first lens L1.

[0106] 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.

[0107] Optionally, the optical lens may further include:

[0108] Aperture STO.

[0109] The aperture STO is provided between the filter L5 and the first lens L1.

[0110] It is understood that the aperture STO can be used to adjust the intensity of light passing through to improve imaging quality. In addition, by placing the aperture STO before each lens, the size of the entire lens can be reduced, achieving miniaturization of the optical lens.

[0111] Optionally, the focal length of the first lens L1 satisfies the following relationship: 1≤f1 / F≤3.5;

[0112] Wherein, f1 is the focal length of the first lens L1, and F is the focal length of the optical lens.

[0113] It can be understood that the first lens L1 has a longer focal length f1, which can collect more light for better convergence.

[0114] Optionally, the focal length of the second lens L2 satisfies the following relationship: -2.5≤f2 / F≤-1.5;

[0115] Wherein, f2 is the focal length of the second lens L2, and F is the focal length of the optical lens.

[0116] It can be understood that the second lens L2 meeting the above-mentioned focal length f2 can smoothly transfer the light collected by the first lens L1 to the third lens L3.

[0117] Optionally, the focal length of the third lens L3 satisfies the following relationship: 0.9≤f3 / F≤1.9;

[0118] Wherein, f3 is the focal length of the third lens L3, and F is the focal length of the optical lens.

[0119] It can be understood that the third lens L3 meeting the above-mentioned focal length f3 can better converge light, which is beneficial to reducing system aberrations and distortion, thereby improving the resolution of the optical lens.

[0120] Optionally, the object-side surface S10 and the image-side surface S11 of the fourth lens L4 satisfy the following relationship: 0.15≤R1 / f4≤0.6, 0.15≤R2 / f4≤0.6;

[0121] Wherein, R1 is the curvature radius of the object-side surface S10 of the fourth lens L4, R2 is the curvature radius of the image-side surface S11 of the fourth lens L4, and f4 is the focal length of the fourth lens L4.

[0122] It can be understood that the fourth lens L4, which meets the above-mentioned focal length f4 and curvature radii R1 and R2, can quickly converge the light collected in the front to the rear optical system.

[0123] Optionally, the focal length of the optical lens satisfies the following relationship: 1.5≤T / F≤2.5;

[0124] Wherein, T is the distance on the optical axis from the center of the object-side surface S4 of the first lens L1 to the imaging surface S12 of the optical lens, and F is the focal length of the optical lens.

[0125] It can be understood that an optical lens that meets the above-mentioned focal length F can reduce the size of the entire lens and achieve miniaturization of the optical lens.

[0126] In summary, from the optical lenses described in the various embodiments related to FIG. 1 , it can be seen that the path of light from an object to reach the imaging surface S14 of the imaging sensor L6 is known.

[0127] Please refer to FIG2 for details, which is a schematic diagram of a light path provided in an embodiment of the present application.

[0128] As shown in Figure 2, light from an object passes through the object-side surface S1 and image-side surface S2 of the filter L5, the aperture STO, the object-side surface S4 and image-side surface S5 of the first lens L1, the object-side surface S6 and image-side surface S7 of the second lens L2, the object-side surface S8 and image-side surface S9 of the third lens L3, the object-side surface S10 and image-side surface S11 of the fourth lens L4, the front surface S12 and the back surface S13 of the protective glass of the imaging sensor L6, and is finally imaged on the imaging surface S14 of the imaging sensor L6.

[0129] It is understandable that the path of the light shown in FIG. 2 passing through the optical lens shown in FIG. 1 to reach the imaging surface is shown only by way of example and is not drawn strictly to scale, and therefore should not be used to limit the embodiments of the present application.

[0130] Optionally, parameter information (curvature radius, thickness / spacing, refractive index and scattering coefficient) of each component of the optical lens shown in FIG1 may be as shown in Table 1 below:

[0131] Table 1

[0132] Among them, the above-mentioned serial number 1 represents the object-side surface of the filter L5, serial number 2 represents the image-side surface of the filter L5, serial number STO represents an aperture, serial number 4 represents the object-side surface of the first lens L1, serial number 5 represents the image-side surface of the first lens L1, serial number 6 represents the object-side surface of the second lens L2, serial number 7 represents the image-side surface of the second lens L2, serial number 8 represents the object-side surface of the third lens L3, serial number 9 represents the image-side surface of the third lens L3, serial number 10 represents the object-side surface of the fourth lens L4, serial number 11 represents the image-side surface 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.

[0133] The surface shape (z) of the third lens L3 can satisfy the following formula:

[0134] Where z is the distance from the vertex of the aspheric surface to the height r along the optical axis, c is the paraxial curvature of the aspheric surface, c = 1 / R, R is the radius of curvature, k is the conic coefficient (conic), a4, a6, a8, a 10 The coefficients of the higher-order terms can be set as shown in Table 2 below:

[0135] Table 2

[0136] Please refer to FIG3 , which is a schematic structural diagram of an optical lens provided in an embodiment of the present application.

[0137] As shown in Figure 3, the optical lens includes:

[0138] The first lens L1, the second lens L2, the third lens L3 and the fourth lens L4 are coaxially arranged in sequence from the object side to the image side.

[0139] Among them, the first lens L1, the third lens L3 and the fourth lens L4 have positive refractive power, and the second lens L2 has negative refractive power.

[0140] 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.

[0141] It can be understood that the first lens L1 in the optical lens is a biconvex lens with positive optical power, which can collect light in the field of view as much as possible, allowing more light to enter the rear optical system, and is conducive to reducing the lens aperture of the second lens L2.

[0142] The second lens L2 in the optical lens is a biconcave lens with negative optical power, which is beneficial for smoothly transitioning the light collected by the first lens L1 to the third lens L3 and is beneficial for increasing the DOF of the optical lens.

[0143] The third lens L3 in the optical lens is a meniscus lens with positive optical power, which can better converge light, help reduce system aberrations and distortion, and thus improve the resolution of the optical lens.

[0144] The fourth lens L4 in this 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.

[0145] 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 reasonably distributing the optical focal length, the system aberration introduced by the large aperture can be reduced, thereby achieving high resolution performance of the optical lens at a large aperture.

[0146] 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.

[0147] According to the embodiment of the present application, the first lens L1 is set as a biconvex lens with positive refractive power, which can collect light within the field of view as much as possible, allowing more light to enter the rear optical system, and is conducive to reducing the lens diameter of the second lens L2.

[0148] Optionally, the material of the first lens L1 includes a first material, and the first material is used to suppress temperature drift of the first lens L1.

[0149] Illustratively, 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.

[0150] Through the embodiments of the present application, the temperature drift resistance of the first lens L1 can be improved.

[0151] In a possible embodiment, the object-side surface S6 of the second lens L2 is a concave surface, and the image-side surface S7 of the second lens L2 is a concave surface.

[0152] Through the embodiment of the present application, the second lens L2 is set as a biconcave lens with negative optical power, which can smoothly transfer 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 of each lens assembly, and ensuring the sensitivity of the lens.

[0153] 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.

[0154] Through the embodiment of the present application, setting the third lens L3 as a meniscus-shaped lens with positive optical power and a convex surface facing the image side can better converge light, which is beneficial to reducing system aberrations and distortion, thereby improving the resolution of the optical lens.

[0155] 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.

[0156] Through the embodiment of the present application, the fourth lens L4 is set to be a meniscus-shaped lens with 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).

[0157] 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 described in detail below.

[0158] In a possible embodiment, the first lens L1 is an aspheric lens, and the third lens L3 is an aspheric lens.

[0159] It can be understood that the characteristic of aspherical lenses is that the curvature changes continuously from the center of the lens to the periphery. Unlike spherical lenses with constant curvature from the center to the periphery of the lens, aspherical lenses have better curvature radius characteristics, greater freedom, and the advantages of improving distortion and astigmatism.

[0160] Therefore, after the first lens L1 and the third lens L3 in the embodiment of the present application are aspherical lenses, the effect of converging light is better, and the aberrations occurring during imaging can be eliminated as much as possible, thereby improving the imaging quality of the optical lens.

[0161] In a possible embodiment, the optical lens may further include:

[0162] Filter L5.

[0163] The filter L5 is located on the image side of the first lens L1 and the object side of the second lens L2.

[0164] As can be understood, the filter L5 is a colored transparent sheet that absorbs, reflects, and transmits colored light. It filters unnecessary noise and corrects color deviation from the light entering the second lens L2. Furthermore, the filter L5, when built between the lenses of the optical lens system, can reduce the clear aperture, thereby optimizing the assembly cost of each lens.

[0165] Optionally, the optical lens may further include:

[0166] Aperture STO.

[0167] The aperture STO is provided between the first lens L1 and the filter L5.

[0168] It is understandable that the intensity of the light passing through the aperture STO can be adjusted to improve the imaging quality.

[0169] Optionally, the focal length of the first lens L1 satisfies the following relationship: 1≤f1 / F≤3.5;

[0170] Wherein, f1 is the focal length of the first lens L1, and F is the focal length of the optical lens.

[0171] It can be understood that the first lens L1 has a longer focal length f1, which can collect more light for better convergence.

[0172] Optionally, the focal length of the second lens L2 satisfies the following relationship: -2.5≤f2 / F≤-1.5;

[0173] Wherein, f2 is the focal length of the second lens L2, and F is the focal length of the optical lens.

[0174] It can be understood that the second lens L2 meeting the above-mentioned focal length f2 can smoothly transfer the light collected by the first lens L1 to the third lens L3.

[0175] Optionally, the focal length of the third lens L3 satisfies the following relationship: 0.9≤f3 / F≤1.9;

[0176] Wherein, f3 is the focal length of the third lens L3, and F is the focal length of the optical lens.

[0177] It can be understood that the third lens L3 meeting the above-mentioned focal length f3 can better converge light, which is beneficial to reducing system aberrations and distortion, thereby improving the resolution of the optical lens.

[0178] Optionally, the object-side surface S10 and the image-side surface S11 of the fourth lens L4 satisfy the following relationship: 0.15≤R1 / f4≤0.6, 0.15≤R2 / f4≤0.6;

[0179] Wherein, R1 is the curvature radius of the object-side surface S10 of the fourth lens L4, R2 is the curvature radius of the image-side surface S11 of the fourth lens L4, and f4 is the focal length of the fourth lens L4.

[0180] It can be understood that the fourth lens L4, which meets the above-mentioned focal length f4 and curvature radii R1 and R2, can quickly converge the light collected in the front to the rear optical system.

[0181] Optionally, the focal length of the optical lens satisfies the following relationship: 1.5≤T / F≤2.5;

[0182] Wherein, T is the distance on the optical axis from the center of the object-side surface S4 of the first lens L1 to the imaging surface S12 of the optical lens, and F is the focal length of the optical lens.

[0183] It can be understood that an optical lens that meets the above-mentioned focal length F can reduce the size of the entire lens and achieve miniaturization of the optical lens.

[0184] In summary, from the optical lenses described in the various embodiments related to FIG. 3 , it can be seen that the path of light from an object to reach the imaging surface S14 of the imaging sensor L6 is known.

[0185] Please refer to FIG4 for details, which is a schematic diagram of a light path provided in an embodiment of the present application.

[0186] As shown in Figure 4, light from an object sequentially passes through the object-side surface S1 and image-side surface S2 of the first lens L1, the aperture STO, the object-side surface S4 and image-side surface S5 of the filter L5, the object-side surface S6 and image-side surface S7 of the second lens L2, the object-side surface S8 and image-side surface S9 of the third lens L3, the object-side surface S10 and image-side surface S11 of the fourth lens L4, the front surface S12 and the back surface S13 of the protective glass of the imaging sensor L6, and is finally imaged on the imaging surface S14 of the imaging sensor L6.

[0187] It is understandable that the path of the light shown in FIG4 through the optical lens shown in FIG3 to reach the imaging surface is shown only by way of example and is not drawn strictly to scale, and therefore should not constitute a limitation to the embodiments of the present application.

[0188] Optionally, parameter information (curvature radius, thickness / spacing, refractive index and scattering coefficient) of each component of the optical lens shown in FIG3 may be as shown in Table 3 below:

[0189] Table 3

[0190] Among them, the above serial number 1 represents the object-side surface of the first lens L1, serial number 2 represents the image-side surface of the first lens L1, serial number STO represents an aperture, serial number 4 represents the object-side surface of the filter L5, serial number 5 represents the image-side surface of the filter L5, serial number 6 represents the object-side surface of the second lens L2, serial number 7 represents the image-side surface of the second lens L2, serial number 8 represents the object-side surface of the third lens L3, serial number 9 represents the image-side surface of the third lens L3, serial number 10 represents the object-side surface of the fourth lens L4, serial number 11 represents the image-side surface 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.

[0191] The surface profiles (z) of the first lens L1 and the third lens L3 can satisfy the following formula:

[0192] Where z is the distance vector from the vertex of the aspheric surface at a height of r along the optical axis, c is the paraxial curvature of the aspheric surface, c = 1 / R, R is the radius of curvature, k is the conic coefficient, a4, a6, a8, etc. are high-order coefficients, which can be set according to the coefficients shown in Table 4 below:

[0193] Table 4

[0194] Please refer to FIG5 , which is a schematic structural diagram of an optical lens provided in an embodiment of the present application.

[0195] As shown in Figure 5, the optical lens includes:

[0196] The first lens L1, the second lens L2, the third lens L3 and the fourth lens L4 are coaxially arranged in sequence from the object side to the image side.

[0197] Among them, the first lens L1, the third lens L3 and the fourth lens L4 have positive refractive power, and the second lens L2 has negative refractive power.

[0198] 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.

[0199] 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 light in the field of view as much as possible, allowing more light to enter the rear optical system, and is conducive to reducing the lens aperture of the second lens L2.

[0200] The second lens L2 in the optical lens is a meniscus lens with negative optical power, which is beneficial for smoothly transitioning the light collected by the first lens L1 to the third lens L3 and is beneficial for increasing the depth of field DOF of the optical lens.

[0201] The third lens L3 in the optical lens is a meniscus lens with positive optical power, which can better converge light, help reduce system aberrations and distortion, and thus improve the resolution of the optical lens.

[0202] The fourth lens L4 in this 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.

[0203] 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 reasonably distributing the optical focal length, the system aberration introduced by the large aperture can be reduced, thereby achieving high resolution performance of the optical lens at a large aperture.

[0204] 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 flat surface.

[0205] According to the embodiment of the present application, the first lens L1 is configured as a plano-convex lens with positive optical power and a convex surface facing the object side. This can collect as much light as possible within the field of view, allowing more light to enter the rear optical system and facilitating a reduction in the aperture of the second lens L2.

[0206] Optionally, the material of the first lens L1 includes a first material, and the first material is used to suppress temperature drift of the first lens L1.

[0207] Illustratively, 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.

[0208] Through the embodiments of the present application, the temperature drift resistance of the first lens L1 can be improved.

[0209] 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.

[0210] Through the embodiment of the present application, the second lens L2 is set to a lens with negative optical power with the convex surface facing the image side, which can smoothly transfer 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 of each lens assembly, and ensuring the sensitivity of the lens.

[0211] 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.

[0212] Through the embodiment of the present application, setting the third lens L3 as a meniscus-shaped lens with positive optical power and a convex surface facing the image side can better converge light, which is beneficial to reducing system aberrations and distortion, thereby improving the resolution of the optical lens.

[0213] 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.

[0214] Through the embodiment of the present application, the fourth lens L4 is set to be a meniscus-shaped lens with 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).

[0215] 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 described in detail below.

[0216] In a possible embodiment, the third lens L3 is an aspheric lens, and the fourth lens L4 is an aspheric lens.

[0217] It can be understood that the characteristic of aspherical lenses is that the curvature changes continuously from the center of the lens to the periphery. Unlike spherical lenses with constant curvature from the center to the periphery of the lens, aspherical lenses have better curvature radius characteristics, greater freedom, and the advantages of improving distortion and astigmatism.

[0218] Therefore, after the third lens L3 and the fourth lens L4 in the embodiment of the present application adopt aspherical lenses, the effect of converging light is better, and the aberrations that occur during imaging can be eliminated as much as possible, thereby improving the imaging quality of the optical lens.

[0219] In a possible embodiment, the optical lens may further include:

[0220] Filter L5.

[0221] The filter L5 is located on the object side of the first lens L1.

[0222] 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.

[0223] Optionally, the optical lens may further include:

[0224] Aperture STO.

[0225] The aperture stop STO is provided on the image-side surface of the first lens L1 , that is, the image-side surface of the first lens L1 and the aperture stop STO are coplanar.

[0226] It is understandable that the intensity of the light passing through the aperture STO can be adjusted to improve the imaging quality.

[0227] Optionally, the focal length of the first lens L1 satisfies the following relationship: 1≤f1 / F≤3.5;

[0228] Wherein, f1 is the focal length of the first lens L1, and F is the focal length of the optical lens.

[0229] It can be understood that the first lens L1 has a longer focal length f1, which can collect more light for better convergence.

[0230] Optionally, the focal length of the second lens L2 satisfies the following relationship: -2.5≤f2 / F≤-1.5;

[0231] Wherein, f2 is the focal length of the second lens L2, and F is the focal length of the optical lens.

[0232] It can be understood that the second lens L2 meeting the above-mentioned focal length f2 can smoothly transfer the light collected by the first lens L1 to the third lens L3.

[0233] Optionally, the focal length of the third lens L3 satisfies the following relationship: 0.9≤f3 / F≤1.9;

[0234] Wherein, f3 is the focal length of the third lens L3, and F is the focal length of the optical lens.

[0235] It can be understood that the third lens L3 meeting the above-mentioned focal length f3 can better converge light, which is beneficial to reducing system aberrations and distortion, thereby improving the resolution of the optical lens.

[0236] Optionally, the object-side surface S10 and the image-side surface S11 of the fourth lens L4 satisfy the following relationship: 0.15≤R1 / f4≤0.6, 0.15≤R2 / f4≤0.6;

[0237] Wherein, R1 is the curvature radius of the object-side surface S9 of the fourth lens L4, R2 is the curvature radius of the image-side surface S10 of the fourth lens L4, and f4 is the focal length of the fourth lens L4.

[0238] It can be understood that the fourth lens L4, which meets the above-mentioned focal length f4 and curvature radii R1 and R2, can quickly converge the light collected in the front to the rear optical system.

[0239] Optionally, the focal length of the optical lens satisfies the following relationship: 1.5≤T / F≤2.5;

[0240] Wherein, T is the distance on the optical axis from the center of the object-side surface S1 of the first lens L1 to the imaging surface S12 of the optical lens, and F is the focal length of the optical lens.

[0241] It can be understood that an optical lens that meets the above-mentioned focal length F can reduce the size of the entire lens and achieve miniaturization of the optical lens.

[0242] In summary, from the optical lenses described in the various embodiments related to FIG. 5 , it can be seen that the path of light from an object reaches the imaging surface S14 of the imaging sensor L6 .

[0243] Please refer to FIG6 for details, which is a schematic diagram of a light path provided in an embodiment of the present application.

[0244] As shown in Figure 6, the light from the object passes through the object-side surface S1 and image-side surface S2 of the filter L5, the object-side surface S3 and image-side surface STO of the first lens L1, the object-side surface S5 and image-side surface S6 of the second lens L2, the object-side surface S7 and image-side surface S8 of the third lens L3, the object-side surface S9 and image-side surface S10 of the fourth lens L4, the front surface S11 and the back surface S12 of the protective glass of the imaging sensor L6, and is finally imaged on the imaging surface S11 of the imaging sensor L6.

[0245] It is understandable that the path of the light shown in FIG6 passing through the optical lens shown in FIG5 to reach the imaging surface is shown only by way of example and is not drawn strictly to scale, and therefore should not constitute a limitation to the embodiments of the present application.

[0246] Optionally, parameter information (curvature radius, thickness / spacing, refractive index and scattering coefficient) of each component of the optical lens shown in FIG5 may be as shown in Table 5 below:

[0247] Table 5

[0248] Among them, the above-mentioned serial number 1 represents the object-side surface of the filter L5, serial number 2 represents the image-side surface of the filter L5, serial number 3 represents the object-side surface of the first lens L1, serial number STO represents the image-side surface of the first lens L1, optionally, serial number STO also represents an aperture, serial number 5 represents the object-side surface of the second lens L2, serial number 6 represents the image-side surface of the second lens L2, serial number 7 represents the object-side surface of the third lens L3, serial number 8 represents the image-side surface of the third lens L3, serial number 9 represents the object-side surface of the fourth lens L4, serial number 10 represents the image-side surface 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.

[0249] The surface profiles (z) of the third lens L3 and the fourth lens L4 can satisfy the following formula:

[0250] Where z is the distance from the vertex of the aspheric surface to the height r along the optical axis, c is the paraxial curvature of the aspheric surface, c = 1 / R, R is the radius of curvature, k is the conic coefficient (conic), a4, a6, a8, a 10 、a 12 The coefficients of the higher-order terms can be set as shown in Table 6 below:

[0251] Table 6

[0252] Optionally, by combining the comparison of the optical lenses shown in FIG. 1 to FIG. 5 , the following Table 7 can be obtained:

[0253] Table 7

[0254] It should be understood that the optical lenses shown in Figures 1, 3, and 5 above are merely three possible exemplary structures for illustrating the optical lenses proposed in this application and should not be construed as limiting the embodiments of this application. New optical lenses obtained by reasonable deformation, supplementation, or combination of the optical lenses shown in Figures 1, 3, and 5 above fall within the scope of protection of this application.

[0255] Correspondingly, an embodiment of the present application further provides an optical imaging device, which includes the optical lens described in each of the embodiments mentioned above.

[0256] Optionally, the optical imaging device may further include:

[0257] Imaging sensor L6.

[0258] Optionally, the optical imaging device may be a laser radar, a camera device (eg, a security black light camera), or other device.

[0259] Optionally, the optical lenses described in the above-mentioned embodiments may also be applied to other optical imaging devices that need to receive light, and the embodiments of the present application are not limited to this.

[0260] This application also provides a terminal device, which includes the optical lens or optical imaging device provided in this application. For example, the terminal device can be a transportation vehicle, such as a car, truck, aircraft, drone, slow-moving transport vehicle, spacecraft, or ship, and any other possible transportation vehicle. It can also be any device capable of carrying a detection device, such as surveying and mapping equipment. The terminal device is equipped with one or more optical lenses or optical imaging devices provided in this application.

[0261] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection 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 relationships: 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, It includes 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, characterized in that, 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.