Optical lens, camera module and electronic equipment

Abstract

The embodiment of the invention provides an optical lens, a camera module and electronic equipment. A first lens, a second lens and at least one third lens are sequentially arranged on the optical lens from the object side to the image side. Wherein the object side is a light entering side, and the image side is a light-based imaging side; a first reflecting layer is arranged at the central position of the side surface, facing the image side, of the first lens; a second reflecting layer is arranged at the non-central position of the second lens; the first reflecting layer and the second reflecting layer are used for reflecting light. The optical lens is used for reducing the total optical length of the lens while realizing the long focal length of the lens, so that the occupied space of the lens is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of photographing equipment, and in particular to an optical lens, a camera module and an electronic device. Background Art

[0002] With the advancement of science and technology, users' demands for photographic quality are increasing. Consequently, telephoto optical lenses are becoming increasingly popular. These lenses can achieve a longer physical focal length, allowing users to capture distant scenes.

[0003] In some technologies, telephoto optical lenses achieve a long focal length by adding a prism to change the direction of light propagation. In these technologies, the addition of a prism results in a longer distance between the first surface of the lens and the imaging surface, which increases the total optical length and, in turn, the lens occupies a larger space.

[0004] Therefore, there is an urgent need for a solution that can achieve a long focal length and reduce the total optical length of the lens. Summary of the Invention

[0005] The optical lens, camera module, and electronic device provided in the embodiments of the present application are used to achieve a long focal length of the lens while reducing the total optical length of the lens, thereby reducing the space occupied by the lens.

[0006] In a first aspect, an embodiment of the present application provides an optical lens, comprising a first lens, a second lens, and at least one third lens, arranged in sequence from the object side to the image side; wherein the object side is the side from which light enters, and the image side is the side from which an image is formed based on the light;

[0007] A first reflecting layer is provided at the center position of the side surface of the first lens facing the image side; a second reflecting layer is provided at a non-center position of the second lens; the first reflecting layer and the second reflecting layer are used for reflecting light.

[0008] In a possible embodiment, an invalid layer is provided at the center of the side surface of the first lens facing the object side, and the invalid layer is used to absorb invalid light; the remaining position of the first lens is used to refract light;

[0009] A second reflective layer is provided at a non-central position of the second lens facing the image side; the remaining position of the second lens is used for refracting light.

[0010] In a possible implementation, the first reflective layer is circular in shape; and the second reflective layer is annular in shape.

[0011] In a possible embodiment, a non-central area of the side surface of the second lens facing the object side is used to refract light refracted from the first lens and / or to refract light reflected from the second reflective layer;

[0012] A central area of the side surface of the second lens facing the object side is used to refract the light reflected from the first reflective layer.

[0013] In a possible implementation, the number of the at least one third lens is three;

[0014] In the optical lens, three third lenses are arranged in sequence from the object side to the image side, starting from the side of the second lens facing the image side.

[0015] In a possible implementation, the optical lens further includes a plurality of intermediate elements; the intermediate elements are used to adjust the gap between the lenses and / or to intercept invalid light;

[0016] Multiple intermediate elements are disposed in the optical lens, and each intermediate element is disposed in at least one of the following positions:

[0017] a side surface of the first lens facing the object side;

[0018] between the first lens and the second lens;

[0019] between the second lens and the third lens;

[0020] In at least one third lens, between two adjacent third lenses.

[0021] In a possible implementation, the refractive index of the first lens is in a range of 1.62 to 1.66, the Abbe coefficient of the first lens is in a range of 21 to 25; and the material of the first lens is a resin material;

[0022] The refractive index of the second lens is in a range of 1.52 to 1.55, and the chromatic aberration coefficient of the second lens is in a range of 53 to 59; the second lens is made of a resin material;

[0023] The refractive index of the third lens is in a range of 1.52 to 1.68, the Abbe coefficient of the third lens is in a range of 18 to 59; and the material of the third lens is a resin material.

[0024] In a possible implementation, a refractive index of a first third lens in the at least one third lens is in a range of 1.62 to 1.66, and an Abbe coefficient of the first third lens is in a range of 21 to 25;

[0025] A refractive index of a second third lens in the at least one third lens is in a range of 1.64 to 1.68, and an Abbe number of the second third lens is in a range of 18 to 23;

[0026] A refractive index of a third third lens in the at least one third lens ranges from 1.52 to 1.56, and an Abbe coefficient of the third third lens ranges from 53 to 59.

[0027] In a possible implementation, the first lens, the second lens, and the at least one third lens are all aspherical lenses.

[0028] In a second aspect, an embodiment of the present application provides a camera module, comprising the optical lens provided in the first aspect, and a solid imaging sensor;

[0029] The optical lens is connected to the solid imaging sensor through a lens mount; a filter is provided on the lens mount; the filter is used to filter out invalid light that is useless for imaging.

[0030] In a third aspect, an embodiment of the present application provides an electronic device, comprising the camera module provided in the second aspect above.

[0031] The optical lens, camera module, and electronic device provided in the embodiments of the present application are configured such that a first reflective layer is provided on the side surface of the first lens facing the image side of the optical lens; and a second reflective layer is provided at a non-central position on the side surface of the second lens facing the image side of the optical lens. The reflective layer reflects light, thereby changing the propagation path of light in the optical lens, thereby achieving a long focal length of the optical lens and improving the imaging effect. Furthermore, there is no need to introduce a prism, shortening the distance from the first lens of the optical lens to the imaging surface, reducing the space occupied by the optical lens, and lowering the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0033] Figure 1 Schematic diagram of the structure of the optical lens provided in this application Figure 1 ;

[0034] Figure 2 is a schematic diagram of an exemplary first lens;

[0035] Figure 3 is a schematic diagram of an exemplary second lens;

[0036] Figure 4 Schematic diagram of an exemplary first lens and a second lens Figure 1 ;

[0037] Figure 5 Schematic diagram of an exemplary first lens and a second lens Figure 2 ;

[0038] Figure 6 A schematic diagram of the light propagation path inside the optical lens provided in this application;

[0039] Figure 7 Schematic diagram of an exemplary first lens and a second lens Figure 3 ;

[0040] Figure 8 Schematic diagram of the structure of the optical lens provided in this application Figure 2 ;

[0041] Figure 9 Schematic diagram of the structure of the optical lens provided in this application Figure 3 ;

[0042] Figure 10 A schematic diagram of the structure of the camera module provided for this application;

[0043] Figure 11 Schematic diagram of an exemplary simulated camera module Figure 1 ;

[0044] Figure 12 The modulation transfer function curve of an exemplary simulated camera module is shown in FIG. Figure 1 ;

[0045] Figure 13 The defocus curve of the exemplary simulated camera module Figure 1 ;

[0046] Figure 14 This is the full field of view distortion curve of an exemplary simulated camera module. Figure 1 ;

[0047] Figure 15 Schematic diagram of an exemplary simulated camera module Figure 2 ;

[0048] Figure 16 The modulation transfer function curve of an exemplary simulated camera module is shown in FIG. Figure 2 ;

[0049] Figure 17 The defocus curve of the exemplary simulated camera module Figure 2 ;

[0050] Figure 18 This is the full field of view distortion curve of an exemplary simulated camera module. Figure 2 .

[0051] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0052] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0053] First, let’s explain the terms involved in this application:

[0054] Object side: refers to the side where the object is located when the optical lens is taking an image; it can also be understood as the side where the light enters the optical lens.

[0055] Image side: refers to the side where the image of the object is located in the optical lens when the optical lens is taking an image; it can also be understood as the side based on light imaging.

[0056] Total optical length: refers to the straight-line distance from the front surface of the first lens in an optical system to the imaging plane. As you can understand, the longer the total optical length, the more space the optical system requires.

[0057] With the advancement of science and technology, users' demands for photographic quality are increasing. In some scenarios, users may need to capture distant objects, requiring a lens with a long focal length. Consequently, telephoto optical lenses are becoming increasingly popular. These lenses can achieve a longer physical focal length, allowing users to capture distant scenes.

[0058] In some embodiments, a telephoto optical lens is formed by adding a prism inside the lens, which changes the propagation direction of light in the lens and the distance of light propagation, thereby achieving a long focal length.

[0059] However, in the above embodiment, the long focal length is achieved by adding a prism, which results in a large distance from the first surface of the lens to the imaging surface, that is, a large total optical length; and further, there is a technical problem that the lens occupies a large space.

[0060] The optical lens, camera module and electronic device provided by the present application are configured such that a first reflective layer is provided on the side surface of the first lens facing the image side of the optical lens; a second reflective layer is provided at a non-central position on the side surface of the second lens facing the image side of the optical lens, and the reflective layer reflects light, thereby changing the propagation path of the light in the optical lens, thereby achieving a long focal length of the optical lens and improving the imaging effect; moreover, there is no need to introduce a prism, shortening the distance from the first lens of the optical lens to the imaging surface, reducing the space occupied by the optical lens, and lowering the production cost.

[0061] The following specific embodiments describe in detail the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0062] Figure 1 Schematic diagram of the structure of the optical lens provided in this application Figure 1 ,like Figure 1 As shown, the optical lens is provided with a first lens 101, a second lens 102 and at least one third lens 103 in sequence from the object side to the image side.

[0063] The object side is the side where light enters, and the image side is the side where an image is formed based on the light.

[0064] A first reflecting layer is provided at the center position of the side surface of the first lens facing the image side; a second reflecting layer is provided at a non-center position of the second lens; the first reflecting layer and the second reflecting layer are used for reflecting light.

[0065] For example, Figure 1 As shown, the optical lens provided in the embodiment of the present application includes a lens barrel. In the lens barrel, a first lens, a second lens and at least one third lens are sequentially arranged from the object side to the image side of the optical lens. It should be noted that Figure 1 The number of third lenses shown in FIG is three. In practical applications, the number of third lenses can be one, two, three, or more. This embodiment does not limit the number of third lenses.

[0066] Light enters the optical lens from the object side, passes through the first lens, the second lens, and at least one third lens in the lens barrel, and reaches the image side. An imaging sensor can be set on the image side of the optical lens to perform imaging.

[0067] Furthermore, a first reflective layer is provided at the center of the side surface of the first lens facing the image plane; the first reflective layer is used to reflect light. Figure 2 is a schematic diagram of an exemplary first lens. Figure 2 As shown, a first reflective layer is provided at the center position of the side surface of the first lens facing the image side.

[0068] Furthermore, a second reflective layer is provided at a non-central position of the second lens surface; the second reflective layer is used to reflect light. Figure 3 is a schematic diagram of an exemplary second lens. Figure 3 As shown in [a] of FIG, a second reflective layer is provided at a non-central position of the side surface of the second lens facing the image side; Figure 3As shown in [b], a second reflective layer is provided at a non-central position of the side surface of the second lens facing the object side.

[0069] In one example, combining Figure 1 、 Figure 2 and Figure 3 [a] is explained as follows: when light reaches the first lens from the object side of the optical lens, it is refracted by the non-center position of the first lens, reaches the side surface of the second lens facing the object side, is refracted at the non-center position of the side surface, reaches the side surface of the second lens facing the image side, and is reflected by the second reflective layer at the non-center position of the side surface; after being reflected by the second reflective layer, the light returns to the side surface of the first lens facing the image side, and is reflected by the first reflective layer at the center position of the side surface; after being reflected by the first reflective layer, the light reaches the center position of the second lens and is refracted; after being refracted by the second lens, the light reaches at least one third lens and is refracted, and reaches the image side of the optical lens for imaging.

[0070] In one example, combining Figure 1 、 Figure 2 and Figure 3 [b] is explained as follows: when light reaches the first lens from the object side of the optical lens, it is refracted by the non-center position of the first lens, reaches the side of the second lens facing the object side, and is reflected by the second reflective surface at a non-center position on the side; after being reflected by the second reflective layer, the light returns to the side of the first lens facing the image side, and is reflected by the first reflective layer at the center position of the side; after being reflected by the first reflective layer, the light reaches the center position of the second lens and is refracted; after being refracted by the second lens, the light reaches at least one third lens and is refracted, and reaches the image side of the optical lens for imaging.

[0071] Specifically, a reflective film may be coated on the center position of the side surface of the first lens facing the image side to form a first reflective layer; and a reflective film may be coated on a non-center position of the side surface of the second lens facing the image side to form a second reflective layer.

[0072] Since the reflective layer is provided on the first lens and the second lens, the propagation path of the light inside the optical lens can be changed, thereby changing the propagation distance of the light and achieving a long focal length of the optical lens.

[0073] It should be noted that in this application, the center position mentioned can be set to the geometric center of the lens surface. The size of the center position can be determined by setting the area occupied by the center position, for example, the area occupied by the center position is 30% of the area of the lens surface.

[0074] The optical lens provided in the embodiment of the present application has a reflective layer disposed at the center of the side of the first lens facing the image side, and a reflective layer disposed at a non-center position on the side of the second lens facing the image side. The reflective layers can change the propagation path and propagation distance of light within the barrel of the optical lens. This allows for a long focal length of the optical lens without adding a prism. This reduces the linear distance between the first lens and the imaging plane of the optical lens, thereby reducing the space occupied by the optical lens. Furthermore, since no prism is required and the space occupied is small, the production cost of the optical lens can be reduced.

[0075] Figure 4 Schematic diagram of an exemplary first lens and a second lens Figure 1 .exist Figure 4 middle, Figure 4 [a] is a schematic diagram of the first lens; Figure 4 [b] is a schematic diagram of the second lens. Figure 4 As shown in [a], a first reflective layer is provided at the center position of the side surface of the first lens facing the image side; an invalid layer is provided at the center position of the side surface of the first lens facing the object side, and the invalid layer is used to absorb invalid light; the remaining position of the first lens is used to refract light.

[0076] Exemplarily, a first reflective layer is provided at the center of the side surface of the first lens facing the image side, and the first reflective layer is used to reflect the light reflected from the second reflective layer.

[0077] A void layer is provided at the center of the side of the first lens facing the object side, and is used to absorb ineffective light. It is understood that for an optical lens, various light rays are collected during shooting, and the void layer can absorb light rays that are ineffective for imaging.

[0078] Optionally, the color of the ineffective layer can be changed based on the logo of the optical lens product. For example, for ultra-telephoto fixed-focus lenses with a focal length greater than or equal to 300mm, retrograde lenses, and astronomical telescopes, the ineffective layer can be set to burgundy to selectively absorb blue-violet light in the 400nm to 500nm band, preventing blue glare caused by the scattering of short-wavelength light within the telephoto lens barrel.

[0079] A non-central position on the side of the first lens facing the object side is used to refract light entering from the object side of the optical lens; a non-central position on the side of the first lens facing the image side is used to refract light refracted from other positions on the side of the first lens facing the object side.

[0080] like Figure 4 As shown in [b], a second reflective layer is provided at a non-central position of the second lens facing the image side; the remaining position of the second lens is used to refract light.

[0081] Exemplarily, a second reflective layer is provided at a non-central position of the side surface of the second lens facing the image side, and the second reflective layer is used to reflect the light refracted from the first lens.

[0082] At other positions of the second lens, it is used to refract light.

[0083] Specifically, the non-central area of the side surface of the second lens facing the object side is used to refract the light refracted from the first lens and / or to refract the light reflected from the second reflective layer.

[0084] For example, Figure 5 Schematic diagram of an exemplary first lens and a second lens Figure 2 . Figure 5 [a] is a schematic diagram of the first lens; Figure 5 [b] is a schematic diagram of the second lens. It should be noted that since the lens is circular, Figure 5 It can be regarded as a side view of the lens. Figure 5 The markings in the figure are for convenience only and only the upper half of the lens is marked. Figure 5 Taking [a] as an example, the lower half of the side of the first lens facing the object side can also be marked as S1, and the lower half of the side of the first lens facing the image side can also be marked as S2; Figure 5 Taking [b] as an example, the lower half of the side surface of the second lens facing the object side can also be marked as S3 (S5), and the lower half of the side surface of the second lens facing the image side can also be marked as S4.

[0085] Combining the above examples, Figure 5 As shown in [a], S0 is the ineffective layer of the first lens, and S6 is the first reflective layer of the first lens; Figure 5 As shown in [b], S4 is the second reflective layer of the second lens.

[0086] After the light enters the optical lens from the object side, it is refracted at the S1 surface and reaches the S2 surface; it is refracted at the S2 surface and reaches the S3 surface; it is refracted at the S3 surface and reaches the S4 surface; it is reflected at the S4 surface and reaches the S5 surface; it is refracted at the S5 surface and reaches the S6 surface; it is reflected at the S6 surface and reaches the S7 surface; it is refracted at the S7 surface and reaches the S8 surface; it is refracted at the S8 surface and reaches the third lens.

[0087] It should be noted that the S3 surface and the S5 surface are the same surface on the actual product. They are only marked separately as the light propagation path, and their meaning does not indicate two surfaces on the actual product.

[0088] It can be understood that the non-central area of the side surface of the second lens facing the object side (such as Figure 5The S3 surface or S5 surface shown in [b] of FIG) is used to refract the light refracted from the S2 surface, and can also be used to refract the light reflected from the S4 surface.

[0089] Specifically, a central area of the side surface of the second lens facing the object side is used to refract the light reflected from the first reflective layer.

[0090] For example, in combination with the above Figure 5 It can be understood from the explanation that the central area of the side surface of the second lens facing the object side (such as Figure 5 The S7 surface shown in [b] of FIG3 is used to refract the light reflected from the S6 surface.

[0091] In the above example, light is refracted through the remaining positions of the first and second lenses, and the first reflective layer on the first lens and the second reflective layer on the second lens alter the light propagation path within the optical lens. This allows for a long focal length without adding a prism to the optical lens. This effectively shortens the overall optical length, reduces the space occupied by the optical lens, and reduces production costs.

[0092] Figure 6 This is a schematic diagram of the light propagation path inside the optical lens provided in this application. Figure 6 As shown, inside the optical lens, light passes through the reflective layers on the first lens and the second lens, which can change the light propagation path between the first lens and the second lens, and then change the propagation distance of the light, thereby achieving a long focal length of the optical lens.

[0093] In the above embodiment, by providing a first reflective layer at the center of the image-facing side of the first lens and a second reflective layer at a non-center position of the image-facing side of the second lens, the light propagation path between the first lens and the second lens in the optical lens can be changed, achieving a long focal length without adding a prism. This effectively shortens the overall optical length, reduces the space occupied by the optical lens, and reduces manufacturing costs.

[0094] Figure 7 Schematic diagram of an exemplary first lens and a second lens Figure 3 . Figure 7 [a] is a schematic diagram of the first lens, and its sight direction is observed from the side of the first lens facing the image side; Figure 7 [b] is a schematic diagram of the second lens, and its line of sight is observed from the side of the second lens facing the image side.

[0095] In one example, the first reflective layer is circular in shape; and the second reflective layer is annular in shape.

[0096] For example, Figure 7As shown in [a] of FIG, a circular first reflective layer is provided at the center of the side surface of the first lens facing the image side. Optionally, the first reflective layer is provided at the center of the side surface of the first lens facing the image side, i.e., the center of the first reflective layer is concentric with the center of the first lens; and the ratio between the radius of the first reflective layer and the radius of the first lens is a preset ratio value.

[0097] For example, Figure 7 As shown in [b], an annular second reflective layer is provided at a non-central position on the side of the second lens facing the image side. Optionally, the second reflective layer is provided at a non-central position on the side of the second lens facing the image side, i.e., the center of the second reflective layer is concentric with the center of the second lens; and the ratio between the inner radius of the second reflective layer and the radius of the second lens is a preset ratio value.

[0098] In the above example, by providing a circular first reflective layer at the center position of the side surface of the first lens facing the image side, and providing an annular second reflective layer at a non-center position of the side surface of the second lens facing the image side, it is possible to ensure that light rays from all directions at the center position of the first lens are effectively reflected; and light rays from all directions at the non-center position of the second lens are effectively reflected.

[0099] Figure 8 Schematic diagram of the structure of the optical lens provided in this application Figure 2 In one example, the number of the at least one third lens is three.

[0100] In the optical lens, three third lenses are arranged in sequence from the object side to the image side, starting from the side of the second lens facing the image side.

[0101] For example, Figure 8 As shown, in the optical lens, from the object side to the image side, a first lens 101, a second lens 102, a first third lens 103, a second third lens 103 and a third third lens 103 are arranged in sequence.

[0102] It should be noted that, in practical applications, the relevant parameters of the three third lenses may be the same or different. Figure 8 The relevant parameters of the three third lenses shown in are different.

[0103] In the above example, by sequentially arranging three third lenses starting from the side of the second lens facing the image side in the optical lens, the light refracted by the second lens can be further refracted, thereby improving the imaging effect.

[0104] Figure 9 Schematic diagram of the structure of the optical lens provided in this application Figure 3In one example, the optical lens further includes a plurality of intermediate elements 104 ; the intermediate elements 104 are used to adjust the gap between lenses and / or to intercept invalid light.

[0105] Exemplarily, the intermediate element can be an aperture stop or an adjustable air gap element. The aperture stop, also known as an aperture stop, is used to control light entering the lens and intercept ineffective light. This can be embodied in any one of the following aspects, or any combination thereof: controlling light intake, controlling depth of field, and controlling aberrations and diffraction.

[0106] Controlling the amount of light entering the lens can be achieved by changing the size of the iris diaphragm opening, adjusting the total amount of light that passes through the lens and reaches the imaging surface (such as film or sensor) per unit time. Depth of field can be controlled by adjusting the aperture size (the size of the iris diaphragm opening), changing the depth of field. Aberrations and diffraction can be controlled by reducing the aperture, which can reduce certain lens aberrations, particularly spherical aberration, coma, and astigmatism. When the aperture is very small, light passing through a very small hole will undergo significant diffraction. Therefore, choosing the appropriate iris diaphragm opening size can balance aberrations and diffraction in optical lens imaging, achieving optimal imaging results.

[0107] For example, the intermediate element can also be an adjustable air gap element. By selecting an appropriate thickness of the adjustable air gap element, the gap between the lenses can be changed. It is understood that the greater the thickness, the greater the gap between the lenses on the left and right sides of the intermediate element.

[0108] Multiple intermediate elements are disposed in the optical lens, and each intermediate element is disposed in at least one of the following positions:

[0109] a side surface of the first lens facing the object side;

[0110] between the first lens and the second lens;

[0111] between the second lens and the third lens;

[0112] In at least one third lens, between two adjacent third lenses.

[0113] Combine Figure 9 For explanation, a plurality of intermediate elements are arranged between lenses in the optical lens. Figure 9 The intermediate elements in the image are sequentially denoted as the first intermediate element, the second intermediate element, the third intermediate element, the fourth intermediate element, and the fifth intermediate element from the object side to the image side. Figure 9 The third lenses are sequentially denoted as the first third lens, the second third lens, and the third third lens from the object side to the image side.

[0114] In one example, the intermediate element is disposed on the side of the first lens facing the object side. Figure 9 As shown in FIG. 1 , the first intermediate element is located on the side of the first lens 101 facing the object side.

[0115] In one example, the intermediate element is disposed between the first lens and the second lens. Figure 9 As shown in FIG. 1 , a second intermediate element is located between the first lens 101 and the second lens 102 .

[0116] In one example, the intermediate element is disposed between the second lens and the third lens. Figure 9 As shown in FIG. 1 , a third intermediate element is located between the second lens 102 and the first third lens.

[0117] In one example, the intermediate element is disposed in at least one third lens and between two adjacent third lenses.

[0118] For example, Figure 9 As shown in FIG. 1 , a fourth intermediate element is positioned between the first third lens and the second third lens; and as shown in FIG. Figure 9 The fifth intermediate element is shown between the second third lens and the third third lens.

[0119] In the above embodiment, by providing a plurality of intermediate elements between the lenses in the optical lens and on the side of the first lens facing the object side, the amount of light entering the optical lens can be controlled, thereby improving the imaging quality; and the position of the lens can be fixed, and the gap between the lenses can be adjusted, thereby reducing friction between the lenses and preventing lens wear.

[0120] Based on any of the foregoing embodiments, this embodiment describes relevant parameters of each lens in an optical lens.

[0121] In one example, the refractive index of the first lens is in the range of 1.62 to 1.66, the Abbe number of the first lens is in the range of 21 to 25, and the material of the first lens is a resin. The refractive index of the second lens is in the range of 1.52 to 1.55, the Abbe number of the second lens is in the range of 53 to 59, and the material of the second lens is a resin. The refractive index of the third lens is in the range of 1.52 to 1.68, the Abbe number of the third lens is in the range of 18 to 59, and the material of the third lens is a resin.

[0122] For example, refractive index is a physical quantity that measures the degree to which light is bent when it passes from one medium into another transparent medium; therefore, the refractive index determines the refractive power of a lens. The dispersion coefficient refers to the property of a medium having different refractive indices for light of different wavelengths (colors). Resin lenses are primarily manufactured using synthetic high-molecular-weight organic polymers (resins) as their base material.

[0123] In order to enable the optical lens provided in the embodiments of the present application to achieve a long focal length, it is necessary to define relevant parameters of the first lens, the second lens, and at least one third lens.

[0124] The refractive index Nd1 of the first lens element should satisfy the following conditions: 1.62 < Nd1 < 1.66; the Abbe number Vd1 of the first lens element should satisfy the following conditions: 21 < Vd1 < 25; the refractive index Nd2 of the second lens element should satisfy the following conditions: 1.52 < Nd2 < 1.55; the Abbe number Vd2 of the second lens element should satisfy the following conditions: 53 < Vd2 < 59.

[0125] The refractive index Ndth of at least one third lens element should satisfy: 1.52<Ndth<1.68; the chromatic aberration coefficient Vdth of at least one third lens element should satisfy: 18<Vdth<59.

[0126] Furthermore, the first lens, the second lens and the at least one third lens are all made of resin material.

[0127] It should be noted that the value range of the correlation coefficients of the first lens, the second lens and the at least one third lens may also be selected as the endpoint value of the range.

[0128] Furthermore, the refractive index of a first third lens in the at least one third lens is in a range of 1.62 to 1.66, and the chromatic aberration coefficient of the first third lens is in a range of 21 to 25; the refractive index of a second third lens in the at least one third lens is in a range of 1.64 to 1.68, and the chromatic aberration coefficient of the second third lens is in a range of 18 to 23; the refractive index of a third third lens in the at least one third lens is in a range of 1.52 to 1.56, and the chromatic aberration coefficient of the third third lens is in a range of 53 to 59.

[0129] For example, the refractive index Nd3 of the first third lens element should satisfy the following: 1.62<Nd3<1.66; the Abbe number Vd3 of the first third lens element should satisfy the following: 21<Vd3<25. The refractive index Nd4 of the second third lens element should satisfy the following: 1.64<Nd4<1.68; the Abbe number Vd4 of the second third lens element should satisfy the following: 18<Vd4<23. The refractive index Nd5 of the third third lens element should satisfy the following: 1.52<Nd5<1.56; the Abbe number Vd5 of the third third lens element should satisfy the following: 53<Vd5<59.

[0130] It should be noted that the value range of the correlation coefficients of the first third lens, the second third lens and the third third lens may also be selected as the endpoint value of the range.

[0131] Based on the relevant parameters of the lens in the above example, the parameters of the optical lens that can be achieved are as follows: the equivalent focal length of the optical lens ranges from 130mm to 150mm; the total optical length of the optical lens ranges from 0.4f to 0.45f, where f is the effective focal length; the aperture of the optical lens ranges from 1.8 to 2.2.

[0132] Combine Figure 9 To illustrate, since the diameters of the first lens and the second lens are large, more light can be allowed to enter the optical lens, and the aperture openings of the first intermediate element and the second intermediate element are large, the amount of light entering can be increased while the optical lens achieves a long focal length, a large aperture, improved imaging quality, and enhanced image quality.

[0133] In the above embodiment, by selecting the relevant parameters and manufacturing materials of each lens in the optical lens, a long focal length and a large aperture of the optical lens can be achieved, and the long focal length and a large aperture of the above optical lens can be achieved without adding a prism, thereby shortening the total optical length and reducing the production cost of the optical lens.

[0134] Based on any of the foregoing embodiments, in one example, the first lens, the second lens, and at least one third lens in the optical lens are all aspherical lenses.

[0135] For example, an aspheric lens refers to a lens whose optical surface is neither spherical nor flat. The optical surface of an aspheric lens is usually a complex curved surface designed by high-order mathematical equations.

[0136] In one example, the optical surfaces of the first lens, the second lens, and the at least one third lens are determined by the following formula (1):

[0137] (1)

[0138] In formula (1), Z is the distance from the aspheric surface vertex to the aspheric surface at a height of h along the optical axis. C = 1 / r, where r represents the radius of curvature of the lens surface, k is the conic coefficient, A is the 4th-order aspheric coefficient, B is the 6th-order aspheric coefficient, C is the 8th-order aspheric coefficient, D is the 10th-order aspheric coefficient, E is the 12th-order aspheric coefficient, F is the 14th-order aspheric coefficient, and G is the 16th-order aspheric coefficient.

[0139] In the above example, in the optical lens, each lens adopts an aspherical lens, which can effectively correct spherical aberration, thereby improving the imaging effect of the optical lens.

[0140] The optical lens provided in the embodiment of the present application has a reflective layer disposed on the side of the first lens facing the image side, and a reflective layer disposed at a non-central position on the side of the second lens facing the image side. The reflective layers can alter the propagation path and distance of light within the barrel of the optical lens. This allows for a long focal length of the optical lens without the need for additional prisms. This reduces the linear distance between the first lens and the imaging plane of the optical lens, thereby reducing the space occupied by the optical lens. Furthermore, since no additional prisms are required and the space occupied is small, the production cost of the optical lens can be reduced.

[0141] Figure 10 The structural diagram of the camera module provided for this application is as follows: Figure 10 As shown, the camera module provided in this embodiment includes: the optical lens provided in the above embodiment, and a solid imaging sensor.

[0142] The optical lens is connected to the solid imaging sensor through a lens mount; a filter is provided on the lens mount; the filter is used to filter out invalid light that is useless for imaging.

[0143] Exemplarily, the optical lens is as shown in the above embodiment, and includes a first lens 101, a second lens 102, at least one third lens 103, and a plurality of intermediate elements 104 inside the optical lens.

[0144] A solid-state imaging sensor is disposed on the image side of the optical lens. This solid-state imaging sensor is connected to the lens barrel of the optical lens via a lens mount. The solid-state imaging sensor may be a complementary metal-oxide-semiconductor (CMOS sensor). This solid-state imaging sensor is used to generate an image based on light refracted from the object side of the optical lens. Furthermore, a filter is disposed on the lens mount. Both the object-facing side and the image-facing side of the filter are flat.

[0145] Optical filters are used to remove ineffective light from the image. For example, solid-state imaging sensors are sensitive to light and can detect infrared and ultraviolet rays in addition to visible light. Failure to filter out these non-visible light sources can result in color shifts in the image.

[0146] Optionally, the filter in this embodiment removes ineffective light from the light source that is not useful for imaging. Besides invisible light, other types of filters can also be provided. For example, a polarizing filter can eliminate reflections from non-metallic surfaces; a narrowband filter can actively provide night vision supplemental light. Both can improve imaging quality.

[0147] The camera module provided in this embodiment, including the optical lens provided in the aforementioned embodiments, can reduce the overall optical length of the optical lens, thereby reducing the space occupied by the camera module and lowering the production cost of the camera module. Furthermore, by providing a filter within the camera module, ineffective light that is not useful for imaging can be filtered out from the image-side refracted light of the optical lens, further improving the imaging quality of the camera module.

[0148] Based on the optical lens and the camera module including the optical lens provided in the aforementioned embodiments, actual simulation tests were performed.

[0149] In one example, Figure 11 Schematic diagram of an exemplary simulated camera module Figure 1 .like Figure 11 As shown, the blue line is the propagation path of the light.

[0150] In the schematic diagram of the simulated camera module, it includes a first lens, a second lens, three third lenses and a filter.

[0151] Combine Figure 5 [a] shows that in Figure 11 In the embodiment, the first lens includes S1 surface, S2 surface and S6 surface; Figure 5 [b] shows that in Figure 11 In the embodiment, the second lens includes S3 surface, S4 surface, S5 surface, S7 surface and S8 surface.

[0152] Further, in Figure 11 In the embodiment, the side of the first third lens facing the object side is the S9 surface, and the side facing the image side is the S10 surface; the side of the second third lens facing the object side is the S11 surface, and the side facing the image side is the S12 surface; the side of the third third lens facing the object side is the S13 surface, and the side facing the image side is the S14 surface.

[0153] Further, in Figure 11 In the figure, the side of the filter facing the object side is the S15 surface, and the side of the filter facing the image side is the S16 surface.

[0154] In such Figure 11 In the illustrated embodiment, relevant parameters of the optical surface of each lens are shown in Table 1. The aspheric coefficients of each lens are shown in Table 2.

[0155] Table 1 Parameters of each lens in the simulated camera module

[0156]

[0157] Table 2 Aspheric coefficients of various aspheric lenses in the simulated camera module Table 1

[0158]

[0159] In such Figure 11 In the illustrated embodiment, the optical lens of the camera module achieves the following parameters: equivalent focal length of 129mm; system focal length f of 14.6mm; aperture of 1.85; field of view of 16°; optical back focus of 0.96mm; total optical length of 6.44mm; and image height greater than 4.8mm. The camera module's solid-state imaging sensor is a 1 / 4-inch CMOS sensor.

[0160] For example Figure 11 The camera module provided in the embodiment shown was subjected to simulation testing, and the test results are as follows. Figure 12 The modulation transfer function curve of an exemplary simulated camera module is shown in FIG. Figure 1 ; Figure 13 The defocus curve of the exemplary simulated camera module Figure 1 ; Figure 14 This is the full field of view distortion curve of an exemplary simulated camera module. Figure 1 .

[0161] analyze Figure 12 It can be seen that the camera module including the optical lens provided in this embodiment has a modulation transfer function (MTF) curve that decreases smoothly at high frequencies (125lp / mm), medium frequencies (90lp / mm), and low frequencies (45lp / mm) across the entire field of view, indicating that the optical system has good imaging effects and resolution across the entire field of view.

[0162] analyze Figure 13 It can be seen that the camera module including the optical lens provided in this embodiment has excellent comprehensive aberration performance in the defocus curve at 90lp / mm.

[0163] analyze Figure 14 It can be seen that the camera module including the optical lens provided in this embodiment has an optical distortion within 2%.

[0164] In one example, Figure 15 Schematic diagram of an exemplary simulated camera module Figure 2 .like Figure 15 As shown, the blue line is the propagation path of the light.

[0165] In the schematic diagram of the simulated camera module, it includes a first lens, a second lens, three third lenses and a filter.

[0166] Combine Figure 5 [a] shows that in Figure 15In the embodiment, the first lens includes S1 surface, S2 surface and S6 surface; Figure 5 [b] shows that in Figure 15 In the embodiment, the second lens includes S3 surface, S4 surface, S5 surface, S7 surface and S8 surface.

[0167] Further, in Figure 15 In the embodiment, the side of the first third lens facing the object side is the S9 surface, and the side facing the image side is the S10 surface; the side of the second third lens facing the object side is the S11 surface, and the side facing the image side is the S12 surface; the side of the third third lens facing the object side is the S13 surface, and the side facing the image side is the S14 surface.

[0168] Further, in Figure 15 In the figure, the side of the filter facing the object side is the S15 surface, and the side of the filter facing the image side is the S16 surface.

[0169] In such Figure 15 In the illustrated embodiment, relevant parameters of the optical surface of each lens are shown in Table 3. The aspheric coefficients of each lens are shown in Table 4.

[0170] Table 3 Parameters of each lens in the simulated camera module Table 2

[0171]

[0172] Table 4 Aspheric coefficients of various aspheric lenses in the simulated camera module Table 2

[0173]

[0174] In such Figure 15 In the illustrated embodiment, the optical lens of the camera module achieves the following parameters: equivalent focal length of 145mm; system focal length f of 16mm; aperture of 2.1; field of view of 15.6°; optical back focus of 0.97mm; total optical length of 6.5mm; and image height greater than 4.8mm. The camera module's solid-state imaging sensor is a 1 / 4-inch CMOS sensor.

[0175] For example Figure 15 The camera module provided in the embodiment shown was subjected to simulation testing, and the test results are as follows. Figure 16 The modulation transfer function curve of an exemplary simulated camera module is shown in FIG. Figure 2 ; Figure 17 The defocus curve of the exemplary simulated camera module Figure 2 ; Figure 18 This is the full field of view distortion curve of an exemplary simulated camera module. Figure 2 .

[0176] analyze Figure 16It can be seen that the camera module including the optical lens provided in this embodiment has a modulation transfer function (MTF) curve that decreases smoothly at high frequencies (125lp / mm), medium frequencies (90lp / mm), and low frequencies (45lp / mm) across the entire field of view, indicating that the optical system has good imaging effects and resolution across the entire field of view.

[0177] analyze Figure 17 It can be seen that the camera module including the optical lens provided in this embodiment has excellent comprehensive aberration performance in the defocus curve at 90lp / mm.

[0178] analyze Figure 18 It can be seen that the camera module including the optical lens provided in this embodiment has an optical distortion within 2%.

[0179] Through the simulation tests of the above two examples, the feasibility of the optical lens and camera module provided in the aforementioned embodiments of the present application is confirmed, and the relevant parameters for shooting that can be actually achieved by the camera module including the optical lens are verified.

[0180] The present application also provides an electronic device, which includes the camera module provided in the above embodiment.

[0181] Exemplarily, the electronic device can be applied to the field of communications. For example, the electronic device can be a mobile phone, a tablet, a user terminal device, etc.

[0182] Exemplarily, the electronic device can be applied to the field of drones. For example, the electronic device can be a drone.

[0183] Exemplarily, the electronic device can be applied to the vehicle field. For example, the electronic device can be an on-board device on a new energy vehicle.

[0184] Exemplarily, the electronic device can be applied to the field of robotics. For example, the electronic device can be an image input device on a robot.

[0185] The electronic device provided in the embodiments of the present application, based on the camera module provided in the aforementioned embodiments, can further reduce the size of the electronic device due to the reduced space occupied by the camera module, making the electronic device more portable when using the camera module; while at the same time, it can also meet the imaging requirements of the electronic device for long-focus and large-aperture photography. In addition, the reduced size of the electronic device can further reduce the production cost of the electronic device.

[0186] Finally, it should be noted that those skilled in the art will readily identify other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art not disclosed herein. The present invention is not limited to the precise structure described above and illustrated in the accompanying drawings, and various modifications and variations may be made without departing from the scope thereof. The scope of the present invention is limited solely by the appended claims.

Claims

1. An optical lens, characterized in that: The optical lens is provided with a first lens, a second lens, and at least a third lens in sequence from the object side to the image side; wherein the object side is the side from which light enters, and the image side is the side from which an image is formed based on the light; A first reflective layer is provided at the center position of the side surface of the first lens facing the image side; a second reflective layer is provided at a non-center position of the second lens; the first reflective layer and the second reflective layer are used for reflecting light.

2. The optical lens according to claim 1, wherein: An invalid layer is provided at the center of the side surface of the first lens facing the object side, and the invalid layer is used to absorb invalid light; the remaining position of the first lens is used to refract light; A second reflective layer is provided at a non-central position of the second lens facing the image side; the remaining position of the second lens is used for refracting light.

3. The optical lens according to claim 2, wherein: The first reflective layer is circular in shape; the second reflective layer is annular in shape.

4. The optical lens according to claim 2, wherein: A non-central area of a side surface of the second lens facing the object side is used to refract light refracted from the first lens and / or to refract light reflected from the second reflective layer; The central area of the side surface of the second lens facing the object side is used to refract the light reflected from the first reflective layer.

5. The optical lens according to claim 1, wherein: The number of the at least one third lens is three; In the optical lens, three third lenses are sequentially arranged starting from the side of the second lens facing the image side and extending from the object side to the image side.

6. The optical lens according to claim 1, wherein: The optical lens further includes a plurality of intermediate elements; the intermediate elements are used to adjust the gap between lenses and / or to intercept invalid light; The plurality of intermediate elements are disposed in the optical lens, and each of the intermediate elements is disposed in at least one of the following positions: a side surface of the first lens facing the object side; between the first lens and the second lens; between the second lens and the third lens; Among the at least one third lens, between two adjacent third lenses.

7. The optical lens according to any one of claims 1 to 6, characterized in that: The refractive index of the first lens is in a range of 1.62 to 1.66, and the chromatic aberration coefficient of the first lens is in a range of 21 to 25; the first lens is made of a resin material; The refractive index of the second lens is in a range of 1.52 to 1.55, and the chromatic aberration coefficient of the second lens is in a range of 53 to 59; the material of the second lens is a resin material; The refractive index of the third lens is in a range of 1.52 to 1.68, and the chromatic aberration coefficient of the third lens is in a range of 18 to 59. The third lens is made of resin.

8. The optical lens according to claim 7, wherein: A refractive index of a first third lens in at least one of the third lenses is in a range of 1.62 to 1.66, and an Abbe coefficient of the first third lens is in a range of 21 to 25; A refractive index of a second third lens in at least one of the third lenses is in a range of 1.64 to 1.68, and an Abbe coefficient of the second third lens is in a range of 18 to 23; A refractive index of a third lens in at least one of the third lenses ranges from 1.52 to 1.56, and an Abbe coefficient of the third lens ranges from 53 to 59.

9. The optical lens according to any one of claims 1 to 6, wherein: The first lens, the second lens and the at least one third lens are all aspherical lenses.

10. A camera module, characterized in that: comprising the optical lens according to any one of claims 1 to 9, and a solid imaging sensor; The optical lens is connected to the solid imaging sensor via a lens mount; a filter is provided on the lens mount; the filter is used to filter out invalid light that is useless for imaging.

11. An electronic device, characterized in that: Comprising the camera module as claimed in claim 10.

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