Optical lens, lens, camera module, and electronic device

Abstract

Embodiments of the present application relate to the technical field of optical lenses, and provide an optical lens, a lens, a camera module, and an electronic device. The optical lens comprises an optical portion and a mechanism portion; the mechanism portion is located at the edge of the optical portion; and the surface of the optical lens is provided with a stray light transmission region located at the mechanism portion and used to transmit light in the optical portion that irradiates the stray light transmission region to the outside of the optical lens. After stray light irradiates from the optical portion to the stray light transmission region, the stray light can be directly transmitted from the stray light transmission region to the outside of the optical lens, thereby reducing the probability of the stray light returning to the optical portion, reducing the impact of the stray light on a photographing picture, and improving the quality of the photographing picture.

Description

Optical lenses, camera modules, and electronic devices

[0001] This application claims priority to Chinese Patent Application No. 202411495774.6, filed with the State Intellectual Property Office of China on October 23, 2024, entitled "Optical Lens, Lens, Camera Module and Electronic Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application belongs to the field of electronic equipment manufacturing technology, and specifically relates to an optical lens, a camera module, and an electronic device. Background Technology

[0003] With the development of electronic technology, electronic devices have become increasingly widely used and have become indispensable tools in people's daily work and life. The camera function is one of the basic functions of many electronic devices, implemented by the camera module within the device.

[0004] The camera module includes a lens. During shooting, light enters the lens from the object side, passes through the optical lenses within the lens, and is ultimately imaged on the image side. The optical lenses consist of an optical section and a mechanism section. The mechanism section, located at the edge of the optical section, is mainly used for mounting the optical lenses. During shooting, stray light often appears within the lens. This light, after entering the mechanism section, may return to the optical section and eventually exit from the image side of the lens, causing bright spots or other bright areas in the captured image.

[0005] In related technologies, stray light is gradually reduced by fogging and blackening the mechanical part, causing it to be reflected and absorbed multiple times within the mechanical part. However, stray light may return to the optical part and exit from the optical part during the reflection process within the mechanical part, affecting the imaging quality. Summary of the Invention

[0006] This application provides an optical lens, a camera module, and an electronic device, which can overcome the problems in related technologies. The technical solution is as follows:

[0007] In a first aspect, embodiments of this application provide an optical lens, which includes an optical portion and a mechanism portion, wherein the mechanism portion is located at the edge of the optical portion;

[0008] The surface of the optical lens has a stray light transmission area, which is located in the mechanism and is used to transmit light rays that are irradiated by the optical part to the outside of the optical lens.

[0009] Based on the above characteristics, stray light is directed from the optical element to the stray light transmission area and then directly transmitted from the stray light transmission area to the outside of the optical lens, thereby reducing the probability of stray light returning to the optical element, reducing the impact of stray light on the captured image, and improving the quality of the captured image.

[0010] In some examples, the optical lens has opposing first and second surfaces, and the stray light transmission region includes a first transmission region located on the first surface, the first transmission region being used to transmit light reflected from the second surface to the first transmission region.

[0011] Based on the above characteristics, a significant amount of stray light enters the mechanism section through reflection from the second surface. By setting the first transmission zone, a large amount of stray light in the mechanism section can be transmitted from the first transmission zone to the outside of the optical lens, which can significantly reduce bright spots and highlights in the captured image and improve the quality of the captured image.

[0012] In some examples, the first transmission region satisfies the following relationship: α=k-γ+a

[0013] Wherein, k is the angle between the tangent at the first incident point and the principal optical axis, the first incident point being the incident point of the light reflected to the first transmission area on the second surface; γ is the incident angle of the light reflected to the first transmission area at the first incident point; α is the angle between the first transmission area and the principal optical axis, or the angle between the tangent at the second incident point and the principal optical axis, the second incident point being the incident point of the light reflected to the first transmission area on the first transmission area; and a is the first threshold.

[0014] Based on the above characteristics, and based on the propagation path and geometric relationship of stray light inside the optical lens, the angle between the first transmission area and the principal optical axis, or the angle α between the tangent of the first transmission area at the second incident point and the principal optical axis, the angle k between the tangent at the first incident point and the principal optical axis, and the incident angle γ of the light reflected to the first transmission area at the first incident point satisfy the above relationship. That is, the stray light reflected to the first transmission area is as perpendicular to the first transmission area as possible, and the angle deviation does not exceed the first threshold, so that the transmittance of stray light is relatively high.

[0015] In some examples, the optical lens has opposing first and second surfaces, and the stray light transmission region includes a second transmission region located on the second surface for transmitting light transmitted from the first surface to the stray light transmission region.

[0016] Based on the above characteristics, some stray light may strike the first surface from outside the optical lens at a large angle of incidence, and after refraction at the first surface, it will directly strike the mechanism. The second transmission zone enables stray light entering the mechanism from the first surface to be transmitted to the outside of the optical lens.

[0017] In other examples, the surface of the optical lens has an annular groove located in the mechanism portion, the annular groove having a first sidewall close to the optical portion and a second sidewall away from the optical portion, and the stray light transmission region includes the first sidewall of the annular groove.

[0018] Light incident from the optical section onto the first sidewall exits from the first sidewall of the annular groove. Based on the above characteristics, by adjusting the shape and / or angle of the first sidewall, the angle at which stray light is incident on the first sidewall can be changed, making the first sidewall as perpendicular as possible to the stray light incident on it, thereby improving the transmittance of the stray light.

[0019] In some examples, the first sidewall is configured such that the angle θ between it and the light rays illuminating it satisfies the following relationship: 0 ≤ 90° - θ ≤ b

[0020] Where b is the second threshold.

[0021] In other words, according to Fresnel's formula, the smaller the incident angle, the higher the transmittance of stray light in the stray light transmission region. By making the first sidewall as perpendicular as possible to the light illuminating the first sidewall, the incident angle of stray light on the first sidewall does not exceed the second threshold b, so that the stray light is perpendicular or approximately perpendicular to the first sidewall when it is incident on the first sidewall, thus giving the stray light a high transmittance.

[0022] In other examples, the optical lens has a plurality of concentrically distributed annular grooves on the same surface, wherein in adjacent annular grooves, the second sidewall of the inner annular groove is connected to the first sidewall of the outer annular groove.

[0023] Based on the above characteristics, adjacent annular grooves are closely arranged, which is beneficial for arranging more annular grooves in a limited space.

[0024] In some examples, the generatrix of the first sidewall is a straight line, and in adjacent annular grooves, the first sidewall of the outer annular groove is perpendicular to the second sidewall of the inner annular groove.

[0025] Since the first sidewall is perpendicular or nearly perpendicular to the stray light incident on the first sidewall, and the first sidewall of the outer annular groove is perpendicular to the second sidewall of the inner annular groove, the stray light incident on multiple annular grooves will hardly irradiate the second sidewall, but will almost entirely irradiate the first sidewall of the annular groove.

[0026] In some examples, the generatrix of the first sidewall is a curve, and at the junction of adjacent annular grooves, the tangent of the first sidewall of the outer annular groove is perpendicular to the second sidewall of the inner annular groove.

[0027] Based on the above characteristics, the generatrix of the first sidewall is curved. By adjusting the curvature of the generatrix at various points, as much stray light as possible can be incident perpendicularly on the first sidewall, thereby further improving the transmittance of stray light.

[0028] As an example, the generatrix of the first sidewall is an arc. In the axial section of the optical lens, the intersection of the extensions of the two second sidewalls in adjacent annular grooves coincides with the center of the generatrix of the first sidewall of the outer annular groove. Setting the generatrix of the first sidewall as an arc allows stray light to enter the first sidewall more perpendicularly at any position on the first sidewall, which is beneficial to improving the transmittance of stray light.

[0029] In some examples, the first sidewall satisfies one of the following:

[0030] The generatrix of the first sidewall is a broken line. From the end of the broken line near the optical part to the end away from the optical part, the angle between each segment of the broken line and the principal optical axis gradually decreases.

[0031] The generatrix of the first sidewall is a curve, and the curvature of the curve gradually changes from the end of the curve near the optical part to the end away from the optical part.

[0032] Based on the above characteristics, stray light from more directions can be incident on the first sidewall in a direction perpendicular to the first sidewall, which is beneficial to improving the transmittance of stray light.

[0033] In some examples, the number of annular grooves located on the same side of the optical lens is 5 to 9.

[0034] Based on the above characteristics, the more annular grooves there are, the more beneficial it is to increase the transmittance of stray light in the stray light transmission area, but the greater the manufacturing difficulty. Setting 5 to 9 annular grooves on the same side can significantly improve the quality of the captured image, and the manufacturing difficulty is not high.

[0035] In some examples, the depth of the annular groove is 0.03 mm to 0.06 mm.

[0036] Based on the above characteristics, the thickness of optical lenses is very small, making it difficult to manufacture annular grooves with large depths, and excessive depth would affect the structural strength of the optical lenses. Setting the depth of the annular groove to 0.03mm to 0.06mm ensures sufficient structural strength for the mechanism and also facilitates manufacturing.

[0037] Secondly, embodiments of this application also provide a lens comprising a plurality of optical lenses arranged coaxially, at least one of the plurality of optical lenses being any of the optical lenses described in the first aspect.

[0038] Based on the above characteristics, the probability of stray light from the optical elements returning to the optical section can be reduced, thus reducing the impact of stray light on the captured image and improving the quality of the captured image.

[0039] In some examples, the lens further includes a light-shielding element disposed opposite to the stray light transmission area of ​​the optical lens. The light-shielding element is capable of absorbing stray light emitted from the stray light transmission area of ​​the optical lens.

[0040] Thirdly, embodiments of this application also provide a camera module, the camera module including a lens mount and any of the lenses described in the second aspect, the lenses being located in the lens mount.

[0041] In some examples, the camera module also includes an aperture stop located on the object side of the lens, which can adjust the amount of light entering the lens.

[0042] Fourthly, embodiments of this application also provide an electronic device, which includes a camera module as described in the third aspect. Attached Figure Description

[0043] Figure 1 is a schematic diagram of the structure of an electronic device provided in an embodiment of this application;

[0044] Figure 2 is a schematic diagram of the structure of a camera module provided in an embodiment of this application;

[0045] Figure 3 is a simplified structural diagram of an optical lens provided in an embodiment of this application;

[0046] Figure 4 is a schematic diagram of an optical lens;

[0047] Figure 5 is a schematic diagram of the stray light simulation results of the optical lens shown in Figure 4;

[0048] Figure 6 is a schematic diagram of the structure of an optical lens provided in an embodiment of this application;

[0049] Figure 7 is a cross-sectional view of an optical lens provided in an embodiment of this application;

[0050] Figure 8 is a schematic diagram of the stray light simulation results of the optical lens shown in Figure 7;

[0051] Figure 9 is a partial structural schematic diagram of an optical lens provided in an embodiment of this application;

[0052] Figure 10 is a partial structural schematic diagram of an optical lens provided in an embodiment of this application;

[0053] Figure 11 is a partial structural schematic diagram of an optical lens provided in an embodiment of this application;

[0054] Figure 12 is a schematic diagram of light transmission in a stray light transmission region provided in an embodiment of this application;

[0055] Figure 13 is a partial structural schematic diagram of an optical lens provided in an embodiment of this application;

[0056] Figure 14 is a partial structural schematic diagram of an optical lens provided in an embodiment of this application;

[0057] Figure 15 is a partial structural schematic diagram of an optical lens provided in an embodiment of this application;

[0058] Figure 16 is a schematic diagram of the structure of an optical lens provided in an embodiment of this application;

[0059] Figure 17 is a schematic diagram of the structure of an optical lens provided in an embodiment of this application;

[0060] Figure 18 is a partial structural schematic diagram of an optical lens provided in an embodiment of this application;

[0061] Figure 19 is a schematic diagram of the structure of an optical lens provided in an embodiment of this application;

[0062] Figure 20 is a schematic diagram of the structure of an optical lens provided in an embodiment of this application;

[0063] Figure 21 is a schematic diagram of the structure of a lens provided in an embodiment of this application;

[0064] Figure 22 is a schematic diagram of the structure of a camera module provided in an embodiment of this application.

[0065] Legend: 1000, Camera module 1001, Lens mount 1002, Lens 100, Optical lens 1003, Aperture 1004, Light shield 1005, Image sensor 101, Optical section 102, Mechanism section 10, Stray light transmission area 10a, First surface 10b, Second surface 11, First transmission area 12, Second transmission area 110, Annular groove 111, First sidewall 112, Second sidewall 13, Stray light reflection area 1021, First support surface 1121, Protrusion 1022, Second support surface Detailed Implementation

[0066] The terminology used in the embodiments section of this application is for illustrative purposes only and is not intended to limit the application. Unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in the patent application specification and claims of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "a" or "one," and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including," and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. The terms "connected," "linked," and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up," "down," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0067] Figure 1 is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. This electronic device can be a device with a shooting function, and can be, but is not limited to, a mobile phone, smartwatch, smart bracelet, tablet computer, PDA, laptop computer, monitor, camera, camcorder, or webcam. In this embodiment, a mobile phone is used as an example. The mobile phone includes a camera module 1000, which, depending on its position on the phone, can generally be divided into a front-facing camera module and a rear-facing camera module.

[0068] Figure 2 is a schematic diagram of a camera module provided in an embodiment of this application. As shown in Figure 2, the camera module 1000 includes a lens mount 1001 and a lens 1002, with the lens 1002 located in the lens mount 1001. The lens 1002 includes a plurality of optical lenses 100 arranged coaxially.

[0069] The camera module 1000 may also include an aperture 1003, which is located on the object side of the lens 1002 and is arranged coaxially with a plurality of optical lenses 100.

[0070] Figure 3 is a simplified structural diagram of an optical lens provided in an embodiment of this application. As shown in Figure 3, the optical lens 100 includes an optical section 101 and a mechanism section 102. The mechanism section 102 is located at the edge of the optical section 101 and can surround the optical section 101. The optical section 101 is the part of the optical lens 100 that acts on light, and the surface of the optical section 101 is the effective area of ​​the optical lens. The mechanism section 102 is used for mounting the optical lens 100, and the surface of the mechanism section 102 is the non-effective area. During the shooting process, it is generally desirable for light to act only on the optical section 101 as much as possible, but in reality, stray light will appear in the lens 1002, and this stray light will enter the mechanism section 102. Figure 4 is a schematic structural diagram of an optical lens, which schematically shows the propagation of stray light A and stray light B. As shown in Figure 4, in the process of light acting on the optical lens, in addition to refraction, reflection also occurs at the surface of the optical lens. During propagation, stray light A and stray light B are reflected multiple times by the two surfaces of the optical lens. During this reflection, both stray light A and stray light B enter the mechanism section 102. Some stray light may also enter the mechanism section 102 directly from the optical section 101 without reflection. To improve the quality of the captured image, it is generally necessary to prevent stray light from escaping from the optical section 101, that is, to prevent stray light entering the mechanism section 102 from returning to the optical section 101. In some related technologies, the structure of the mechanism section 102 is designed by frosting and blackening its surface. The frosted surface of the mechanism section 102 becomes rough, enabling diffuse reflection of stray light and breaking it down. The blackened surface of the mechanism section 102 absorbs stray light. Through multiple reflections and absorptions of stray light by the frosted and blackened surface, the stray light is reduced, thus preventing it from returning to the optical section 101. For example, stray light A in the figure is continuously reflected within the mechanism section 102. Through multiple reflections and absorptions, stray light A is gradually reduced. However, some stray light may still return to the optical section 101 and exit from it. For example, stray light B in Figure 4, after multiple reflections in the mechanism section 102, eventually returns to the optical section 101 and exits. This may be because stray light B is reflected too few times in the mechanism section 102, insufficient to reduce stray light B to a negligible level, or it may be due to insufficient light absorption, fogging, or defects in the blackening process of the ink used in the blackening process. Especially in some space-constrained situations, such as mobile phones and watches, the space for arranging the camera module 1000 is very small, and the thickness of the optical lens needs to be designed to be very thin. This results in significant limitations on the design of the mechanism section 102, making it prone to uneven fogging and blackening, and even some areas not being blackened. This causes a lot of stray light to return from the mechanism section 102 to the optical section 101 and then be emitted from the optical section 101.The stray light emitted from the optical section 101 may eventually exit from the image side of the lens 1002, adversely affecting the quality of the captured image. This usually manifests as bright spots or highlights in the captured image. For example, Figure 5 is a schematic diagram of the stray light simulation results of the optical lens shown in Figure 4. As shown in Figure 5, there is a bright spot with relatively high brightness near the center of the image. The position and brightness of this bright spot will significantly affect the quality of the captured image.

[0071] Figure 6 is a schematic diagram of an optical lens provided in an embodiment of this application. As shown in Figure 6, the optical lens includes an optical section 101 and a mechanism section 102, with the mechanism section 102 located at the edge of the optical section 101. Figure 7 is a cross-sectional view of an optical lens provided in an embodiment of this application. As shown in Figure 7, the surface of the optical lens has a stray light transmission region 10, which is located in the mechanism section 102. The stray light transmission region 10 is used to transmit light rays from the optical section 101 that illuminate the stray light transmission region 10 to the outside of the optical lens.

[0072] In this embodiment, by providing a stray light transmission area 10 on the surface of the optical lens, and the stray light transmission area 10 being located in the mechanism 102, stray light is directly transmitted from the stray light transmission area 10 to the outside of the optical lens after being irradiated by the optical unit 101. This reduces the probability of stray light returning to the optical unit 101, reduces the impact of stray light on the captured image, and helps to improve the quality of the captured image.

[0073] Figure 8 is a schematic diagram of the stray light simulation results of the optical lens shown in Figure 7. As shown in Figure 8, bright spots exist only near the edge of the image, and the intensity of these bright spots is very low. Although bright spots still exist, their location near the edge of the image and their low brightness have little impact on the quality of the captured image. Comparing Figure 8 and Figure 5, it can be seen that the optical lens provided in this embodiment can significantly improve the quality of the captured image.

[0074] Furthermore, since there is no need to perform atomization and blackening treatment on the mechanism 102, problems caused by defects in the atomization and blackening process can also be avoided.

[0075] The optical lens has a first surface 10a and a second surface 10b opposite to each other. The stray light transmission region 10 can be located on the first surface 10a of the optical lens, or on the second surface 10b of the optical lens, or on both the first surface 10a and the second surface 10b.

[0076] Figure 9 is a partial structural schematic diagram of an optical lens provided in an embodiment of this application. As an example, as shown in Figure 9, the stray light transmission region 10 includes a first transmission region 11, which is located on the first surface 10a. The first transmission region 11 is used to transmit light reflected from the second surface 10b to the first transmission region 11.

[0077] In this embodiment, the first surface 10a can be the object-side side of the optical lens near the lens, and the second surface 10b can be the image-side side of the optical lens near the lens. The light reflected from the second surface 10b to the first transmission area 11 can be light transmitted from the first surface 10a to the second surface 10b.

[0078] There are several ways in which stray light enters the mechanism section 102. Among them, most stray light enters the mechanism section 102 through reflection from the second surface 10b. By setting the first transmission area 11, more stray light in the mechanism section 102 can be transmitted to the outside of the optical lens, which can significantly reduce bright spots and highlights in the captured image and improve the quality of the captured image.

[0079] In some other possible implementations, the second surface 10b may also be the object-side side of the optical lens in the lens, and the first surface 10a may be the image-side side of the optical lens in the lens. The light reflected from the second surface 10b to the first transmission area 11 may be light that has been transmitted from the second surface 10b to the first surface 10a and then reflected from the first surface 10a back to the second surface 10b.

[0080] Figure 10 is a partial structural schematic diagram of an optical lens provided in an embodiment of this application. As shown in Figure 10, in some examples, the stray light transmission region 10 may include a second transmission region 12, which is located on the second surface 10b of the optical lens. The second transmission region 12 is used to transmit light transmitted from the first surface 10a of the optical lens to the stray light transmission region 10.

[0081] Some stray light may strike the first surface 10a from outside the optical lens at a large angle of incidence, and after refraction at the first surface 10a, it will directly strike the mechanism 102. By providing a second transmission area 12 on the second surface 10b, stray light that enters the mechanism 102 from the first surface 10a can be transmitted to the outside of the optical lens.

[0082] Figure 11 is a partial structural schematic diagram of an optical lens provided in an embodiment of this application. As shown in Figure 11, in some examples, the surface of the optical lens has an annular groove 110, which is located in the mechanism portion 102. The annular groove 110 has a first sidewall 111 near the optical portion 101 and a second sidewall 112 away from the optical portion 101. The stray light transmission region 10 includes the first sidewall 111 of the annular groove 110.

[0083] The first transmission region 11 includes a first sidewall 111 of an annular groove 110 located on the first surface 10a, and the second transmission region 12 includes a first sidewall 111 of an annular groove 110 located on the second surface 10b.

[0084] By arranging an annular groove 110 in the mechanism section 102, the stray light transmission area 10 includes a first sidewall 111 of the annular groove 110. Light incident from the optical section 101 onto the first sidewall 111 exits from the first sidewall 111 of the annular groove 110. By adjusting the shape and / or angle of the first sidewall 111, the angle at which stray light is incident on the first sidewall 111 can be changed, making the first sidewall 111 as perpendicular as possible to the stray light incident on the first sidewall 111, thereby improving the transmittance of stray light.

[0085] Figure 12 is a schematic diagram of light transmission in a stray light transmission region according to an embodiment of this application. As shown in Figure 12, the first sidewall 111 is configured such that the angle θ between it and the light ray illuminating the first sidewall 111 satisfies the following relationship: 0≤90°-θ≤b (1)

[0086] Where b is the second threshold.

[0087] The included angle θ is the complementary angle of the incident angle of the light ray incident on the first sidewall 111, and 90°-θ is the incident angle of the light ray incident on the first sidewall 111. According to Fresnel's formula, the smaller the incident angle of the light ray, the greater the transmittance of the light ray. In this embodiment, by configuring the first sidewall 111, the incident angle of stray light illuminating the first sidewall 111 does not exceed the second threshold, that is, the first sidewall 111 is perpendicular or approximately perpendicular to the stray light incident on the first sidewall 111, so that the stray light has a high transmittance on the first sidewall 111, so that more stray light is transmitted outside the optical lens.

[0088] As an example, b can be 0–10°, for instance, b can be 0, 3°, 5°, 7°, or 10°. The smaller the second threshold, the higher the transmittance of stray light in the stray light transmission region 10, the better the stray light elimination effect, and the higher the quality of the captured image. The second threshold can be set as needed during the design of the optical lens to balance the quality of the captured image and the cost of the lens.

[0089] As shown in Figure 11, the same surface of the optical lens has multiple concentrically distributed annular grooves 110. In adjacent annular grooves 110, the second sidewall 112 of the inner annular groove 110 is connected to the first sidewall 111 of the outer annular groove 110.

[0090] In other words, the adjacent annular grooves 110 are closely arranged, which is beneficial to arrange more annular grooves 110 in a limited space, forming a larger area of ​​stray light transmission zone 10, so that stray light can be transmitted more fully from the stray light transmission zone 10 to the outside of the optical lens.

[0091] As an example, the generatrix of the first sidewall 111 is a straight line. In adjacent annular grooves 110, the first sidewall 111 of the outer annular groove 110 is perpendicular to the second sidewall 112 of the inner annular groove 110.

[0092] The generatrix of the first sidewall 111 is a straight line, meaning that the first sidewall 111 is a conical surface. On the axial section of the optical lens, the first sidewall 111 appears as a line segment. Since the first sidewall 111 is perpendicular or approximately perpendicular to stray light incident on the first sidewall 111, and the first sidewall 111 of the outer annular groove 110 is perpendicular to the second sidewall 112 of the inner annular groove 110, stray light incident on the multiple annular grooves 110 will hardly irradiate the second sidewall 112, but will almost entirely irradiate the first sidewall 111 of the annular groove 110.

[0093] Figure 13 is a partial structural schematic diagram of an optical lens provided in an embodiment of this application. As shown in Figure 13, in some examples, the first transmission region 11 satisfies the following relationship: α=k-γ+a (2)

[0094] Wherein, k is the angle between the tangent at the first incident point and the principal optical axis M, the first incident point is the incident point of the light reflected to the first transmission area 11 on the second surface 10b; γ is the incident angle of the light reflected to the first transmission area 11 at the first incident point; α is the angle between the first transmission area 11 and the principal optical axis M; and a is the first threshold.

[0095] a can be a positive number, a negative number, or zero. For example, a can be -10° to 10°, such as -10°, -7°, -5°, -3°, 0, 3°, 5°, 7°, or 10°.

[0096] Taking the first transmission region 11 as an example, as shown in Figure 13, the surface of the optical lens also has a stray light reflection region 13, which is located on the second surface 10b of the optical lens 100. The stray light reflection region 13 is located at the edge of the optical section 101.

[0097] Due to the shape and curvature of the effective area, the edge portion of the effective area on the second surface 10b of the optical lens 100 easily reflects stray light, causing the stray light to enter the mechanism section 102. The stray light reflection area 13 refers to the portion of the effective area of ​​the optical lens that reflects stray light to the mechanism section 102.

[0098] The stray light reflected from the stray light reflection area 13 to the first transmission area 11 has an incident angle on the second surface 10b that is not less than the third threshold c.

[0099] Lens 1002 has a field of view (FOV). For a given lens 1002, light entering the lens from the object side within the FOV range is ultimately emitted from the image side of the lens 1002 under the action of the optical section 101 of the optical lens to form an image. Light entering the lens 1002 with an incident angle exceeding half of the FOV will enter the optical section 102 of the optical lens during its propagation within the lens 1002. The path of this portion of light propagating within the lens 1002 can be determined by simulation or other means, thereby determining the incident angle of the stray light that illuminates the stray light reflection area 13 and is reflected by the stray light reflection area 13 to the section 102, which is also the incident angle of the stray light reflected by the stray light reflection area 13 to the second surface 10b of the first transmission area 11.

[0100] The third threshold c can be greater than or equal to the angle of incidence when light from the incident lens 1002, with an incident angle of half the field of view, illuminates the second surface 10b. As an example, the third threshold c can be equal to the angle of incidence when light from the incident lens 1002, with an incident angle of half the field of view, illuminates the second surface 10b.

[0101] A rectangular coordinate system is established with the center of the second surface 10b of the optical lens as the origin, the principal optical axis M of the optical lens as the X-axis, and one radius of the optical lens as the Y-axis. By means of simulation, the trajectory of stray light propagating in the lens 1002 can be determined, and thus the position of the area of ​​the second surface 10b of the optical lens that reflects stray light in the coordinate system can be determined, that is, the position of the stray light reflection area 13 in the coordinate system. The trajectory of stray light before and after being reflected by the second surface 10b can also be represented as a definite linear function.

[0102] Here, we take a first incident point and a stray light reflected by the first incident point as an example. The first incident point can be any point in the stray light reflection area 13. The coordinates of the first incident point in the rectangular coordinate system are (X0, Y0). Since the shape of the second surface 10b is determined, we can obtain the angle k between the tangent plane that is tangent to the second surface 10b at the first incident point (X0, Y0) and the principal optical axis M, which is the angle k between the tangent line shown in Figure 13 and the X-axis.

[0103] The incident angle γ and reflection angle of the stray light at the first incident point (X0, Y0) can also be obtained based on the law of reflection. According to Fresnel's formula, in order for the stray light reflected from the first incident point (X0, Y0) to exit the optical lens in the first transmission region 11 with the highest possible transmittance, the stray light should be incident on the first transmission region 11 as perpendicularly as possible. That is, the first transmission region 11 should be perpendicular to the stray light reflected from the first incident point (X0, Y0). Combining geometric relationships, it can be deduced that the angle between the generatrix of the first sidewall 111 and the principal optical axis M is the difference between the angle k and the incident angle γ, that is, the angle α between the first transmission region 11 and the principal optical axis M is the difference between the angle k and the incident angle γ.

[0104] The incident point of the light reflected to the first transmission region 11 is defined as the second incident point. Based on the above, it can be seen that for any first reflection point in the stray light reflection region 13, the transmittance at the second incident point can be maximized by ensuring that the stray light transmission region 10 satisfies the relationship α = k - γ at the second incident point. Therefore, by ensuring that the relationship α = k - γ is satisfied at every second incident point of the first transmission region 11, the transmittance of stray light reflected from each first reflection point can be maximized. However, in practice, ensuring that the relationship α = k - γ is satisfied at every second incident point of the first transmission region 11 is uneconomical and would significantly increase the manufacturing difficulty of the optical lens. By introducing a first threshold 'a' into the relationship, the stray light is made perpendicular or approximately perpendicular to the stray light transmission region 10 at the second incident point, thus maintaining a high transmittance for stray light in the stray light transmission region 10. The closer the first threshold 'a' is to 0, the higher the transmittance of stray light in the stray light transmission region 10.

[0105] The following example, using the construction of seven annular grooves 110 on the first surface 10a of an optical lens, further illustrates the relationship between the angle between the first sidewall 111 of each annular groove 110 and the principal optical axis M. Figure 14 is a partial structural schematic diagram of an optical lens provided in an embodiment of this application. This optical lens can be any one of six optical lenses in a lens. The field of view of this lens can be 90°. Light rays incident on this lens at an angle of incidence exceeding 45° will enter the mechanism 102 of the optical lens during propagation within the lens 1002.

[0106] Seven first incident points in the stray light reflection area 13 are selected, with coordinates (0.032, 0.61), (0.034, 0.66), (0.036, 0.73), (0.037, 0.79), (0.037, 0.84), (0.038, 0.89), and (0.043, 0.95), respectively. As an example, the first of these seven first incident points can be the point in the stray light reflection area 13 closest to the principal optical axis M. In Figure 14, coordinates (X... 01 Y01 ), (X 02 Y 02 )……(X 07 Y 07 The diagram shows seven first incident points, with only a portion of these seven points shown schematically. In the axial section of the optical lens, the second surface 10b is a curve. Based on this curve, the angles between the tangents at the seven first incident points and the principal optical axis M can be obtained, which are the angles k between the tangent at the first incident point and the principal optical axis M.

[0107] When light rays incident on the lens at an angle of 45° reach point (0.032, 0.61), the angle of incidence γ is 33°; when light rays incident on the lens at an angle of 48° reach point (0.034, 0.66), the angle of incidence γ is 35°; when light rays incident on the lens at an angle of 50° reach point (0.036, 0.73), the angle of incidence γ is 37.5°; when light rays incident on the lens at an angle of 50.5° reach point (… When the incident angle is (0.037, 0.79), the incident angle γ is 38°; when the light ray incident on the lens at an incident angle of 51° reaches point (0.037, 0.84) in the lens, the incident angle γ is 41°; when the light ray incident on the lens at an incident angle of 51.5° reaches point (0.038, 0.89) in the lens, the incident angle γ is 44.5°; when the light ray incident on the lens at an incident angle of 52° reaches point (0.043, 0.95) in the lens, the incident angle γ is 47.5°.

[0108] According to equation (2), taking the first threshold a as 0, the angles between the first transmission region 11 and the principal optical axis M at the seven second incident points are 54.5°, 52.5°, 52°, 51.5°, 48.7°, 41.7° and 36.5° respectively. In Figure 14, these angles are represented by coordinates (X... 11 Y 11 ), (X 12 Y 12 )……(X 17 Y 17 () represents the seven second incident points, and only a portion of the seven second incident points are shown schematically. The distances from the seven second incident points to the principal optical axis M can be calculated based on geometric relationships.

[0109] For example, the distance from the second incident point to the principal optical axis M can be obtained according to the following relationship: Y 1n =Y 0n +(X 0n -X 1n ) / tanα (3)

[0110] Among them, X1n and Y 1n Let X represent the x-coordinate and y-coordinate of the second incident point, respectively. 0n and Y 0n Let x and y represent the x and y coordinates of the first incident point, respectively, where n is a positive integer not greater than 7.

[0111] In this example, the origin of the coordinate system is located at the center of the second surface 10b of the optical lens, X 1n The absolute value of Y is the thickness of the optical lens at the second incident point, with the center of the second surface 10b of the optical lens as the reference. 1n The absolute value of is the distance from the second incident point to the principal optical axis M.

[0112] Since the mechanism 102 is mainly used for assembling optical lenses, its shape and thickness can be set according to the assembly requirements of the optical lenses. Therefore, the abscissas of the multiple second incident points can be set according to the shape and thickness of the mechanism 102. The abscissas of the multiple second incident points can be the same or different. For example, the abscissas of the multiple second incident points can increase or decrease.

[0113] As an example, multiple second incident points have the same x-coordinate.

[0114] Taking the example where the x-coordinate of multiple second incident points is -0.27, the y-coordinates of the seven second incident points can be obtained from the above formula as 0.82, 0.89, 0.97, 1.03, 1.11, 1.23, and 1.37, respectively. Thus, the coordinates of the seven second incident points, and the angles between the first transmission zone 11 and the principal optical axis M at these seven second incident points, are (-0.27, 0.82) and 54.5°, (-0.27, 0.89) and 52.5°, (-0.27, 0.97) and 52°, (-0.27, 1.03) and 51.5°, (-0.27, 1.11) and 48.7°, (-0.27, 1.23) and 41.7°, and (-0.27, 1.37) and 36.5°.

[0115] Thus, the positions of the seven annular grooves 110 and the angles between the first sidewall 111 and the principal optical axis M are determined. Specifically, the angle between the first sidewall 111 of the annular groove 110 transmitting stray light reflected from point (0.032, 0.61) and the principal optical axis M is 54.5°; the angle between the first sidewall 111 of the annular groove 110 transmitting stray light reflected from point (0.034, 0.66) and the principal optical axis M is 52.5°; the angle between the first sidewall 111 of the annular groove 110 transmitting stray light reflected from point (0.036, 0.73) and the principal optical axis M is 52°; and the angle between the first sidewall 111 of the annular groove 110 transmitting stray light reflected from point (0.037, 0.79) and the principal optical axis M is 52°. The angle between the first sidewall 111 of the annular groove 110 and the principal optical axis M is 51.5°. The angle between the first sidewall 111 of the annular groove 110 that transmits stray light reflected from point (0.037, 0.84) and the principal optical axis M is 48.7°. The angle between the first sidewall 111 of the annular groove 110 that transmits stray light reflected from point (0.038, 0.89) and the principal optical axis M is 41.7°. The angle between the first sidewall 111 of the annular groove 110 that transmits stray light reflected from point (0.043, 0.95) and the principal optical axis M is 36.5°.

[0116] As can be seen from the process of constructing the seven annular grooves 110, the stray light reflected from the seven first incident points is perpendicular to the first transmission area 11, resulting in the highest light transmittance. The stray light reflected from the other first incident points in the stray light reflection area 13 is not completely perpendicular to the first transmission area 11, but has a certain angle. However, the incident angle is very small, so it can be considered that the stray light is approximately perpendicular to the first transmission area 11. The transmittance of the stray light is still relatively high, which can effectively improve the quality of the captured image.

[0117] In the above example, although the annular groove 110 located on the first surface 10a is described using the first transmission region 11 as an example, the annular groove 110 located on the second surface 10b of the second transmission region 12 can also be constructed in a similar manner.

[0118] In some examples, the number of annular grooves 110 located on the same side of the optical lens is 5 to 9.

[0119] The more annular grooves 110 there are, the better it is to increase the transmittance of stray light in the stray light transmission area 10. However, too many grooves will increase the manufacturing difficulty, and the difficulty will increase with the increase of the number of annular grooves 110, but the change in transmittance will gradually decrease with each additional annular groove 110. Usually, setting 5 to 9 annular grooves 110 on the same side of the optical lens can significantly improve the quality of the captured image, and the manufacturing difficulty is not high.

[0120] As an example, there are 7 annular grooves 110 located on the same side of the optical lens.

[0121] In some examples, the depth of the annular groove 110 is 0.03 mm to 0.06 mm.

[0122] The depth of the annular groove 110 can be the depth of the annular groove 110 along the main optical axis M.

[0123] With a fixed thickness, the greater the depth of the annular groove 110, the lower the structural strength of the mechanism 102. In some applications, such as lenses used in front-facing camera modules of mobile phones, the thickness of the optical lenses is very small, making it difficult to manufacture annular grooves 110 with a large depth. Setting the depth of the annular groove 110 to 0.03mm to 0.06mm ensures that the mechanism 102 maintains sufficient structural strength and is also easy to manufacture.

[0124] For example, the thickness of the optical lens can be 0.2 mm.

[0125] Figure 15 is a partial structural schematic diagram of an optical lens provided in an embodiment of this application. As shown in Figure 15, in this example, the generatrix of the first sidewall 111 is a curve. At the connection of adjacent annular grooves 110, the tangent of the first sidewall 111 of the outer annular groove 110 is perpendicular to the second sidewall 112 of the inner annular groove 110.

[0126] As mentioned earlier, when the generatrix of the first sidewall 111 in the first transmission region 11 is a straight line, some stray light is incident on the first sidewall 111 approximately perpendicularly, rather than completely perpendicularly. In this example, the generatrix of the first sidewall 111 is curved. By adjusting the curvature at various points along the generatrix, as much stray light as possible can be incident perpendicularly on the first sidewall 111, thereby further improving the transmittance of stray light.

[0127] For the annular groove 110 whose generatrix of the first sidewall 111 is a curve, the first transmission region 11 also satisfies the relation (2). In this case, in the relation (2), α is the angle between the tangent of the first transmission region 11 at the second incident point and the principal optical axis M.

[0128] As an example, the generatrix of the first sidewall 111 is an arc. In the axial section of the optical lens, in adjacent annular grooves 110, the intersection of the extensions of the two second sidewalls 112 coincides with the center of the generatrix of the first sidewall 111 of the outer annular groove 110.

[0129] For the optical lens shown in Figure 15, the annular groove 110 can be constructed in a similar manner to the aforementioned construction of seven annular grooves 110 with straight generatrices. Taking the construction of seven annular grooves 110 as an example, after determining the coordinates of multiple second incident points using the same method as described above, a ray is obtained by connecting the second incident point to its corresponding first incident point and extending the ray. By using the seven second incident points as endpoints, seven rays can be constructed. The intersection of these rays is also the intersection point of the stray light extending backward from the first incident point to the second incident point.

[0130] Taking the rays constructed from points (-0.27, 0.82), (-0.27, 0.89), and (-0.27, 0.97) as examples, the intersection point of the ray with endpoint (-0.27, 0.82) and the ray with endpoint (-0.27, 0.89) is C1, and the intersection point of the ray with endpoint (-0.27, 0.89) and the ray with endpoint (-0.27, 0.97) is C2. With intersection point C1 as the center and the line connecting intersection point C1 and point (-0.27, 0.82) as the radius, draw a circle. The portion of this arc between the lines connecting intersection point C1 and point (-0.27, 0.82) and the line connecting intersection point C1 and point (-0.27, 0.89) forms the generatrix of the first sidewall 111 of an annular groove 110. With intersection point C2 as the center and the line connecting intersection point C2 and point (-0.27, 0.89) as the radius, draw a circle. The portion of this arc between the lines connecting intersection point C2 and point (-0.27, 0.89) and the line connecting intersection point C2 and point (-0.27, 0.97) forms the generatrix of the first sidewall 111 of another annular groove 110. This process yields the generatrixes of the first sidewalls 111 of six annular grooves 110. The intersection of the ray with endpoint (-0.27, 1.23) and the ray with endpoint (-0.27, 1.37) is C6. To determine the generatrix of the first sidewall 111 of the last annular groove 110, draw a circle with intersection point C6 as the center and the line connecting intersection point C6 and point (-0.27, 1.37) as the radius. This forms the generatrix of the first sidewall 111 of the last annular groove 110. The central angle corresponding to the generatrix of the first sidewall 111 of the last annular groove 110 can be the same as the central angle corresponding to the generatrix of the first sidewall 111 of the previous annular groove 110, or the central angle corresponding to the generatrix of the first sidewall 111 of the last annular groove 110 can be set according to the thickness of the area of ​​the mechanism 102 outside the first transmission zone 11.

[0131] Setting the generatrix of the first sidewall 111 as an arc allows stray light, which can be equivalent to being emitted from the center of the arc, to enter the first sidewall 111 more perpendicularly at any position, which is beneficial to improving the transmittance of stray light.

[0132] Figure 16 is a schematic diagram of an optical lens provided in an embodiment of this application. As shown in Figure 16, in this optical lens, the generatrix of the first sidewall 111 of the annular groove 110 is a broken line. From the end of the broken line near the optical part 101 to the end away from the optical part 101, the angle between each segment of the broken line and the principal optical axis M gradually decreases. To facilitate the differentiation of each segment of the broken line, the bends of the broken line are marked with dots in Figure 16.

[0133] The first sidewall 111 of the annular groove 110 in the example shown in Figure 16 can be equivalent to moving the first sidewalls 111 of multiple annular grooves 110 in the example shown in Figure 14 to form a connection. This can reduce the number of annular grooves 110 and avoid making a single annular groove 110 too small to be easy to process.

[0134] Figure 17 is a schematic diagram of the structure of an optical lens provided in an embodiment of this application. As shown in Figure 17, in this optical lens, the generatrix of the first sidewall 111 of the annular groove 110 is a curve, and the curvature of the curve gradually changes from the end of the curve near the optical part 101 to the end away from the optical part 101.

[0135] In some examples, the first sidewall 111 of the annular groove 110 in the example shown in Figure 17 can be equivalent to moving the first sidewall 111 of multiple annular grooves 110 in the example shown in Figure 15 to form a connected structure, which can also reduce the number of annular grooves 110 and avoid the difficulty in processing a single annular groove 110 due to its small size.

[0136] In other examples, the curvature of the generatrix of the first sidewall 111 of the annular groove 110 in the example shown in Figure 17 may also be continuously varied so that each point of the first sidewall 111 is perpendicular to the stray light incident on the first sidewall 111.

[0137] Figure 18 is a partial structural schematic diagram of an optical lens provided in an embodiment of this application. As shown in Figure 18, in the mechanism portion 102 of the optical lens, the first surface 10a further includes a first support surface 1021, which is located outside the plurality of annular grooves 110. The first support surface 1021 is relatively flat, and adjacent optical lenses in the lens 1002 can support each other through the first support surface 1021.

[0138] In the mechanism section 102, the second sidewall 112 of the partial annular groove 110 may have a protrusion 1121, the protrusion 1121 having a second support surface 1022, the second support surface 1022 being flush with the edge of the second sidewall 112. In the lens 1002, a light-shielding member 1004 may be provided between adjacent optical lenses to absorb stray light emitted from the optical lenses. The second support surface 1022 may be used to support the light-shielding member 1004.

[0139] In some examples, the protrusion 1121 may be annular and arranged concentrically with the annular groove 110.

[0140] As an example, there can be multiple protrusions 1121, which are distributed at intervals along the annular groove 110. This reduces the possibility that stray light emitted from the first sidewall 111 of the annular groove 110 will illuminate the protrusions 1121 and return to the interior of the optical lens.

[0141] Figure 19 is a schematic diagram of an optical lens structure provided in an embodiment of this application. As shown in Figure 19, in this example, the first transmission region 11 is close to the edge of the optical lens. The position of the first transmission region 11 on the first surface 10a is affected by the relationship between the diameters and curvatures of the two surfaces of the optical part 101. In the example shown in Figure 19, on the first surface 10a of the optical lens, the diameter of the optical part 101 is larger and the curvature is smaller; on the second surface 10b of the optical lens, the diameter of the optical part 101 is smaller and the curvature is larger, such that the plurality of annular grooves 110 are located at the edge of the mechanism part 102. The first support surface 1021 is located inside the plurality of annular grooves 110.

[0142] As an example, optical lenses can be either plastic or glass.

[0143] Figure 20 is a schematic diagram of an optical lens provided in an embodiment of this application. As shown in Figure 20, the optical lens shown in this example has a similar structure to that shown in Figure 19, except that the annular groove 110 in Figure 20 is an arc.

[0144] Figure 21 is a schematic diagram of a lens structure provided in an embodiment of this application. As shown in Figure 21, the lens includes a plurality of optical lenses 100 arranged coaxially, and at least one of the plurality of optical lenses 100 can be the aforementioned optical lens 100. In the lens shown in Figure 21, the shape of each optical lens 100 is only for illustration and does not represent the actual shape of the optical lens 100.

[0145] For example, from the object side to the image side of the lens, the first optical lens 100 is the aforementioned optical lens 100; for another example, from the object side to the image side of the lens, the last optical lens 100 is the aforementioned optical lens 100; for yet another example, from the object side to the image side of the lens, the second optical lens 100 is the aforementioned optical lens 100.

[0146] In lens 1002, only some optical lenses may cause stray light to emerge from the object side of the lens. The propagation path of light in the lens can be simulated to determine which optical lens will cause stray light to emerge from the object side, and then these optical lenses can be replaced.

[0147] As shown in Figure 21, the lens may also include multiple light-shielding elements 1004, which are located between adjacent optical lenses 100. The light-shielding elements 1004 may be annular and may be arranged coaxially with the optical lenses 100. The light-shielding elements 1004 are used to block light and absorb stray light that hits the light-shielding elements 1004.

[0148] The light-shielding member 1004 can be arranged opposite to the stray light transmission area 10 of the optical lens 100, so that stray light emitted from the stray light transmission area 10 can be absorbed by the light-shielding member 1004.

[0149] Adjacent optical lenses 100 can be offset to make the multiple optical lenses 100 fit together more tightly and avoid relative movement between different optical lenses 100 that would affect imaging.

[0150] Figure 22 is a schematic diagram of a camera module provided in an embodiment of this application. As shown in Figure 22, the camera module includes a lens mount 1001 and the aforementioned lens 1002. The lens 1002 is located in the lens mount 1001.

[0151] For example, the camera module can be the front-facing camera module of a mobile phone.

[0152] As shown in Figure 22, the camera module may further include an image sensor 1005, which is located on the image side of the lens 1002. Light emitted from the image side of the lens 1002 can illuminate the image sensor 1005.

[0153] The camera module also includes an aperture 1003, which is located on the object side of the lens 1002. The aperture 1003 can be used to adjust the amount of light entering the lens 1002.

[0154] The above description is merely one embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An optical lens, characterized in that, It includes an optical section (101) and a mechanism section (102), wherein the mechanism section (102) is located at the edge of the optical section (101); The surface of the optical lens has a stray light transmission area (10), which is located in the mechanism (102) and is used to transmit light from the optical part (101) that is irradiated to the stray light transmission area (10) to the outside of the optical lens.

2. The optical lens according to claim 1, characterized in that, The optical lens has a first surface (10a) and a second surface (10b) opposite to each other. The stray light transmission region (10) includes a first transmission region (11) located on the first surface (10a) for transmitting light reflected from the second surface (10b) to the first transmission region (11).

3. The optical lens according to claim 2, characterized in that, The first transmission region (11) satisfies the following relationship: α=k-γ+a Wherein, k is the angle between the tangent at the first incident point and the principal optical axis (M), the first incident point being the incident point of the light reflected to the first transmission area (11) on the second surface (10b); γ is the incident angle of the light reflected to the first transmission area (11) at the first incident point; α is the angle between the first transmission area (11) and the principal optical axis (M), or the angle between the tangent of the first transmission area (11) at the second incident point and the principal optical axis (M), the second incident point being the incident point of the light reflected to the first transmission area (11) on the first transmission area (11); and a is the first threshold.

4. The optical lens according to any one of claims 1 to 3, characterized in that, The optical lens has a first surface (10a) and a second surface (10b) opposite to each other. The stray light transmission region (10) includes a second transmission region (12) located on the second surface (10b) for transmitting light transmitted from the first surface (10a) to the stray light transmission region (10).

5. The optical lens according to any one of claims 1 to 4, characterized in that, The surface of the optical lens has an annular groove (110) located in the mechanism (102). The annular groove (110) has a first sidewall (111) near the optical part (101) and a second sidewall (112) away from the optical part (101). The stray light transmission area (10) includes the first sidewall (111) of the annular groove (110).

6. The optical lens according to claim 5, characterized in that, The first sidewall (111) is configured such that the angle θ between it and the light rays illuminating the first sidewall (111) satisfies the following relationship: 0≤90°-θ≤b Where b is the second threshold.

7. The optical lens according to claim 5 or 6, characterized in that, The optical lens has a plurality of concentrically distributed annular grooves (110) on the same surface. In adjacent annular grooves (110), the second sidewall (112) of the inner annular groove (110) is connected to the first sidewall (111) of the outer annular groove (110).

8. The optical lens according to claim 7, characterized in that, The generatrix of the first sidewall (111) is a straight line. In the adjacent annular grooves (110), the first sidewall (111) of the outer annular groove (110) is perpendicular to the second sidewall (112) of the inner annular groove (110).

9. The optical lens according to claim 7, characterized in that, The generatrix of the first sidewall (111) is a curve. At the connection of adjacent annular grooves (110), the tangent of the first sidewall (111) of the outer annular groove (110) is perpendicular to the second sidewall (112) of the inner annular groove (110).

10. The optical lens according to claim 9, characterized in that, The generatrix of the first sidewall (111) is an arc. On the axial section of the optical lens, in the adjacent annular groove (110), the intersection of the extensions of the two second sidewalls (112) coincides with the center of the generatrix of the first sidewall (111) of the outer annular groove (110).

11. The optical lens according to any one of claims 5 to 7, characterized in that, The first sidewall (111) satisfies one of the following: The generatrix of the first sidewall (111) is a broken line. From the end of the broken line near the optical part (101) to the end away from the optical part (101), the angle between each segment of the broken line and the principal optical axis (M) gradually decreases. The generatrix of the first sidewall (111) is a curve, and the curvature of the curve gradually changes from one end of the curve near the optical part (101) to the other end away from the optical part (101).

12. The optical lens according to any one of claims 5 to 11, characterized in that, The number of the annular grooves (110) located on the same side of the optical lens is 5 to 9.

13. The optical lens according to any one of claims 5 to 12, characterized in that, The depth of the annular groove (110) is 0.03 mm to 0.06 mm.

14. A lens, characterized in that, It includes a plurality of optical lenses (100) arranged coaxially, at least one of the plurality of optical lenses (100) being an optical lens (100) as described in any one of claims 1 to 13.

15. The lens according to claim 14, characterized in that, It also includes a light-shielding member (1004), which is arranged opposite to the stray light transmission area (10) of the optical lens (100).

16. A camera module, characterized in that, It includes a lens mount (1001) and a lens (1002) as described in claim 14 or 15, wherein the lens (1002) is located in the lens mount (1001).

17. The camera module according to claim 16, characterized in that, It also includes an aperture stop (1003) located on the object side of the lens (1002).

18. An electronic device, characterized in that, Includes the camera module (1000) as described in claim 16 or 17.

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