Optical folding elements, camera modules and electronic devices

Abstract

The present application relates to the technical field of photographing equipment, and the present application provides an optical folding element, a camera module and an electronic device. The optical folding element includes a first surface, a second surface, a first side surface and a second side surface, the first surface and the second surface are arranged opposite to each other, the first side surface and the second side surface are arranged opposite to each other, and both are connected between the first surface and the second surface, the optical folding element has an incident surface and an exit surface, the incident surface is located on the first surface, and the exit surface is located on the first surface or the second surface; the optical folding element also includes a plurality of first grooves, and the plurality of first grooves are distributed on the first side surface and / or the second side surface, the length extension direction of the projection of the first groove on the first plane is arranged at an angle with the normal direction of the incident surface, the first plane is perpendicular to the first direction, and the first direction is the direction from the first side surface to the second side surface. The imaging quality of the optical folding element of the present application is good.

Description

Technical Field

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

[0002] When the user takes a photo, in addition to the effective light in the shooting area that enters the camera module, there will also be stray light outside the shooting area that enters the camera module and forms an image on the image sensor, reducing the image quality. Currently, camera modules used to achieve telephoto shooting usually have a prism folding light path to increase the total length of the module's optical system to meet the long focal length requirements. However, due to the presence of the prism, in the telephoto camera module, the interference of stray light is very obvious, greatly affecting the image quality of the shot. Summary of the invention

[0003] An embodiment of the present application provides an optical folding element with good imaging quality, including a camera module of the optical folding element, and an electronic device including the camera module.

[0004] In the first aspect, an optical folding element is provided. The optical folding element includes a first surface, a second surface, a first side surface and a second side surface, the first surface and the second surface are arranged opposite to each other, the first side surface and the second side surface are arranged opposite to each other, and both are connected between the first surface and the second surface, the optical folding element has an incident surface and an exit surface, the incident surface is located on the first surface, and the exit surface is located on the first surface or the second surface; the optical folding element also includes a plurality of first grooves, the plurality of first grooves are distributed on the first side surface and / or the second side surface, the length extension direction of the projection of the first groove on the first plane is arranged at an angle with the normal direction of the incident surface, the first plane is perpendicular to the first direction, and the first direction is the direction from the first side surface to the second side surface; wherein, the first light enters the optical folding element from the incident surface, is reflected multiple times inside the optical folding element, and is emitted from the exit surface, and the second light enters the optical folding element from the incident surface, and is reflected in the direction toward the incident surface under the action of the groove surface of the first groove.

[0005] It can be understood that the optical folding element in this embodiment is provided with a plurality of first grooves on its side (including the first side and the second side), and the projection of the first groove on the first plane can be set at an angle relative to the normal direction of the incident surface. In this way, when the second light is transmitted to the side of the optical folding element, the second light can be reflected in the direction toward the incident surface under the action of the groove surface of the first groove. That is, after the second light transmitted to the side in the optical folding element of this embodiment is reflected by the groove surface of the first groove, it will not be emitted from the exit surface and imaged on the image sensor, thereby effectively reducing the influence of stray light on the imaging quality, which is beneficial to improving the user's shooting experience.

[0006] In a possible implementation, the angle formed by the length extension direction of the projection of the first groove on the first plane and the normal direction of the incident surface is less than or equal to 50°. In this way, the first groove is arranged at a certain angle between the projection of the first plane and the normal direction of the incident surface, so that the first groove can better eliminate stray light, thereby reducing the influence of stray light on imaging quality.

[0007] In a possible implementation, the angle formed by the first groove between the length extension direction of the projection of the first plane and the normal direction of the incident surface is less than or equal to 15°. In this way, the first groove can better eliminate stray light, thereby reducing the influence of stray light on imaging quality.

[0008] In one possible implementation, the optical folding element also includes a first reflective surface, which is located between the first surface and the second surface and on the same side of the first side surface and the second side surface, and the first reflective surface is arranged closer to the incident surface than the exit surface; the angle formed by the projection of the first groove on the first plane and the first surface is greater than 90°, and the opening of the angle faces the first reflective surface.

[0009] In this way, the first groove can be tilted in the direction toward the first reflective surface. When the second light is reflected by the first reflective surface and transmitted to the groove surface of the first groove, the incident angle between the second light and the groove surface of the first groove is small, so that the second light can be reflected to the first reflective surface or the second surface under the action of the groove surface of the first groove, and finally reflected in the direction toward the incident surface under the action of the first reflective surface or the second surface. That is, in this embodiment, by setting the first end of the first groove to be tilted in the direction close to the first reflective surface compared to the second end, stray light entering the optical folding element can be better eliminated, which is beneficial to reduce the influence of stray light on imaging quality.

[0010] In one possible implementation, the refractive index of the optical folding element is greater than or equal to 1.7.

[0011] It is understandable that, compared with optical folding elements with a smaller refractive index, in order to match their larger total reflection angle and reduce the impact of stray light, the volume of optical folding elements is usually larger, which is not conducive to realizing the miniaturization of the camera module. Even if the optical folding element reduces its own volume in order to meet the miniaturization setting, due to the smaller refractive index and larger total reflection angle, more stray light will be generated in the optical folding element, affecting the imaging effect of the camera module. The optical folding element in this embodiment is prepared by using a material with a higher refractive index, so that the total reflection angle of light in the optical folding element is smaller, thereby satisfying the imaging effect of the camera module while compressing the volume of the optical folding element, which is conducive to realizing the miniaturization of the camera module. In other words, the optical folding element in this embodiment can have a smaller volume while taking into account the imaging quality of the camera module.

[0012] In a possible implementation, the material of the optical folding element is heavy lanthanum flint glass or heavy crown glass. In this way, the refractive index of the optical folding element is relatively large, so that the optical folding element can have a small volume while taking into account the imaging quality.

[0013] In a possible implementation manner, the first side surface is arranged at an angle to the first surface, and the distance between the first side surface and the second side surface increases in a direction approaching the second surface.

[0014] It can be understood that the distance between the first side and the second side of the optical folding element in this embodiment can increase in the direction approaching the second surface. The first side can be set at an angle to the incident surface. In this way, when the second light is transmitted to the first side, the second light can be reflected by the first side to the bottom surface of the optical folding element (that is, the second surface in this embodiment), thereby effectively avoiding the imaging of the second light, which is beneficial to reduce the influence of stray light on the imaging quality. At the same time, the projection of the first groove on the first plane is set at an angle relative to the normal direction of the incident surface, which can further adapt to the optical folding element with a narrow upper and wide lower structure, so that the stray light entering the optical folding element can be better eliminated, reducing the influence of stray light on the imaging quality, and improving the user experience.

[0015] In a possible implementation, the angle formed between the first side surface and the first surface is in the range of 100° to 130°. In this way, the first side surface has a better effect of eliminating stray light, which is conducive to reducing the influence of stray light on imaging quality.

[0016] In a possible implementation, the angle formed between the first reflection surface and the incident surface is in the range of 20° to 40°. In this way, the first reflection surface and the incident surface are in a certain angle range, so that the first groove can better eliminate stray light and reduce the influence of stray light on imaging quality.

[0017] In one possible implementation, the optical folding element further includes a plurality of second grooves, and the openings of the plurality of second grooves are all formed on the second surface. It can be understood that the optical folding element in this embodiment is provided with a plurality of second grooves on the bottom surface of the optical folding element (also the second surface in this embodiment), and the groove surface of the second groove can reflect light. In this way, when stray light is reflected to the second surface, the stray light can be reflected by the groove surface of the second groove and transmitted in the direction toward the incident surface. That is, the stray light reflected by the groove surface of the second groove will not be emitted from the exit surface in the end and imaged on the image sensor, thereby effectively reducing the influence of stray light on the imaging quality and helping to improve the user's shooting experience.

[0018] In a possible implementation, the length extension direction of the second groove is arranged at an angle to the first direction. In this way, the second groove can better eliminate stray light, which is helpful to reduce the influence of stray light on imaging quality.

[0019] In a possible implementation, the angle formed between the length extension direction of the second groove and the first direction is less than or equal to 10°. In this way, the second groove can better eliminate stray light, which is conducive to reducing the influence of stray light on imaging quality.

[0020] In a possible implementation, the optical folding element further includes a second reflective surface, which is located between the first surface and the second surface and on the side of the first side facing away from the first reflective surface; the optical folding element further includes a light-blocking layer, which is located between the first reflective surface and the second reflective surface, the light-blocking layer is fixedly connected to the second surface and is spaced apart from the first surface, and a light-transmitting area is formed between the light-blocking layer and the first surface. In this way, the light-blocking layer can block stray light, avoid stray light imaging, and help reduce the influence of stray light on imaging quality.

[0021] In a possible implementation, the optical folding element further includes a light-blocking groove, the opening of which is formed on the second surface, the groove surface of which can reflect light, and the groove surface of which constitutes a light-blocking layer; the groove surface of the light-blocking groove includes a first groove side surface and a second groove side surface that are arranged opposite to each other, and a groove top surface connected between the first groove side surface and the second groove side surface, and the groove top surface is in an arc shape; or, the groove top surface includes a first top surface and a second top surface that are arranged at an angle, and the angle between the first top surface and the second top surface is in the range of 20° to 120°. In this way, the light-blocking groove can better eliminate stray light, which is beneficial to reducing the influence of stray light on imaging quality.

[0022] In one possible implementation, the optical folding element further includes a plurality of third grooves, and the openings of the plurality of third grooves are all formed on the top surface of the groove. It can be understood that the optical folding element in this embodiment further includes a plurality of third grooves. The plurality of third grooves can be located on the top surface of the light-blocking groove. In this way, when stray light is directed toward the top surface of the light-blocking groove, the stray light can be reflected in the direction toward the incident surface under the action of the groove surface of the third groove, thereby effectively avoiding the stray light from being imaged on the image sensor, which is beneficial to reducing the influence of stray light on the imaging quality and improving the user's shooting experience.

[0023] In a possible implementation, the groove surface of the first groove includes a first groove surface and a second groove surface that are arranged opposite to each other, and the angle formed between the first groove surface and the second groove surface is in the range of 30° to 110°. In this way, the first groove can better eliminate stray light, which is conducive to reducing the influence of stray light on imaging quality.

[0024] In a possible implementation, the groove surface of the first groove includes a first groove surface and a second groove surface that are oppositely arranged, and the width of the first groove surface is greater than or equal to 10 microns; or, the width of the first groove surface is between 10 microns and 100 microns.

[0025] In this way, the width of the first groove surface is relatively moderate. On the one hand, it can avoid the width of the first groove surface being too small, which will lead to excessive mechanical stress when processing the first groove, which is not conducive to processing. At the same time, when processing the first groove, the surface shape of the first groove surface can be guaranteed, which is conducive to improving the processing accuracy. On the other hand, it can avoid the width of the first groove surface being too large, which will lead to increased preparation cost, which is not conducive to reducing the preparation cost of the entire optical folding element.

[0026] In a possible implementation, the groove surface of the first groove includes a first groove surface and a second groove surface that are arranged opposite to each other, and the first groove surface is connected to the second groove surface; or, a fillet is formed at the connection between the first groove surface and the second groove surface, and the radius of the fillet is less than or equal to 10% of the height of the triangle where the first groove surface and the second groove surface are located; or, a fillet is formed at the connection between the first groove surface and the second groove surface, and the radius of the fillet is less than or equal to 10 microns. In this way, the cross section of the first groove can be roughly triangular, which can better reflect stray light directed to the first side surface in the direction toward the incident surface, avoid stray light imaging, and help ensure imaging quality.

[0027] In a possible implementation, the groove surface of the first groove includes a first groove surface and a second groove surface that are arranged opposite to each other, the first groove surface and the second groove surface are both arc surfaces, and the curvature center of the first groove surface and the curvature center of the second groove surface are located on opposite sides of the first groove. In this way, the first groove can better eliminate stray light, which is conducive to reducing the influence of stray light on imaging quality.

[0028] In a possible implementation, the optical folding element also includes a first light absorbing layer, which is fixed in the first groove and covers at least a portion of the groove surface of the first groove.

[0029] In this way, after the stray light is directed to the groove surface of the first groove, at least part of the energy of the stray light can be absorbed by the first light absorption layer, which can effectively reduce the energy of the stray light and reduce the impact of the stray light on the image quality, which is conducive to improving the user's shooting experience. At the same time, the first end of the first groove is inclined in a direction close to the first reflection surface compared to the second end, so that the incident angle between the stray light transmitted to the first groove and the groove surface of the first groove is small, so that most of the energy of the stray light can be absorbed by the first light absorption layer, thereby effectively eliminating the impact of the stray light on the image quality.

[0030] In the second aspect, an optical folding element is provided. The optical folding element includes a first surface, a second surface and a third surface connected end to end in sequence, the first surface is perpendicular to the second surface, the optical folding element has an incident surface and an exit surface, the incident surface is located on the first surface, and the exit surface is located on the second surface; the optical folding element also includes a first side surface and a second side surface, the first side surface and the second side surface are both connected to the first surface, the second surface and the third surface, the first side surface and the second side surface are located on opposite sides of the first surface; the optical folding element also includes a plurality of first grooves, and the plurality of first grooves are distributed on the first side surface and / or the second side surface; wherein, a first light ray enters the optical folding element from the incident surface, is reflected inside the optical folding element, and is emitted from the exit surface, and a second light ray enters the optical folding element from the incident surface, and is reflected in the direction toward the incident surface under the action of the groove surface of the first groove.

[0031] It can be understood that the optical folding element in this embodiment is a prism, and by providing a plurality of first grooves on the first side surface and / or the second side surface, and the length extension direction of the first grooves intersects with the normal direction of the incident surface, the stray light directed to the first side surface or the second side surface can be reflected by the groove surface of the first groove in the direction toward the incident surface, and will not be transmitted to the exit surface, and finally imaged on the image sensor. That is, the optical folding element in this embodiment can effectively reduce the influence of stray light on the imaging quality and improve the user's shooting experience.

[0032] In a possible implementation, the length extension direction of the first groove intersects with the normal direction of the incident surface. In this way, the first groove can better eliminate stray light transmitted to the side of the optical folding element, which is beneficial to improving the imaging quality.

[0033] In a possible implementation, the length extension direction of the first groove is perpendicular to the normal direction of the incident surface. In this way, the first groove can better eliminate stray light transmitted to the side of the optical folding element, which is beneficial to improving the imaging quality.

[0034] In one possible implementation, the refractive index of the optical folding element is greater than or equal to 1.7.

[0035] It is understandable that, compared with optical folding elements with a smaller refractive index, in order to match their larger total reflection angle and reduce the impact of stray light, the volume of optical folding elements is usually larger, which is not conducive to realizing the miniaturization of the camera module. Even if the optical folding element reduces its own volume in order to meet the miniaturization setting, due to the smaller refractive index and larger total reflection angle, more stray light will be generated in the optical folding element, affecting the imaging effect of the camera module. The optical folding element in this embodiment is prepared by using a material with a higher refractive index, so that the total reflection angle of light in the optical folding element is smaller, thereby satisfying the imaging effect of the camera module while compressing the volume of the optical folding element, which is conducive to realizing the miniaturization of the camera module. In other words, the optical folding element in this embodiment can have a smaller volume while taking into account the imaging quality of the camera module.

[0036] In a possible implementation, the material of the optical folding element is heavy lanthanum flint glass or heavy crown glass. In this way, the refractive index of the optical folding element is relatively large, so that the optical folding element can have a small volume while taking into account the imaging quality.

[0037] In a possible implementation, the groove surface of the first groove includes a first groove surface and a second groove surface that are arranged opposite to each other, and the angle formed between the first groove surface and the second groove surface is in the range of 30° to 110°. In this way, the first groove can better eliminate stray light, which is conducive to reducing the influence of stray light on imaging quality.

[0038] In a possible implementation, the groove surface of the first groove includes a first groove surface and a second groove surface that are arranged opposite to each other, and the width of the first groove surface is greater than or equal to 10 microns; or, the width of the first groove surface is between 10 microns and 100 microns. In this way, the width of the first groove surface is relatively moderate, which can avoid the first groove surface width being too small, resulting in excessive mechanical stress when processing the first groove, which is not conducive to processing, and at the same time, when processing the first groove, the surface shape of the first groove surface can be guaranteed, which is conducive to improving processing accuracy; on the other hand, it can avoid the first groove surface width being too large, resulting in increased preparation costs, which is not conducive to reducing the preparation cost of the entire optical folding element.

[0039] In a possible implementation, the groove surface of the first groove includes a first groove surface and a second groove surface that are arranged opposite to each other, the first groove surface and the second groove surface are both arc surfaces, and the curvature center of the first groove surface and the curvature center of the second groove surface are located on opposite sides of the first groove. In this way, the first groove can better eliminate stray light, which is conducive to reducing the influence of stray light on imaging quality.

[0040] In a third aspect, a camera module is provided. The camera module includes an image sensor and the above-mentioned optical folding element, and the image sensor is located on the image side of the optical folding element. It can be understood that the optical folding element of the camera module in this embodiment has less stray light and the imaging quality of the camera module is better.

[0041] In a fourth aspect, an electronic device is provided. The electronic device comprises a device housing and the above-mentioned camera module, wherein the camera module is arranged in the device housing. It can be understood that the camera module of the electronic device in this embodiment has good imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the implementation methods of the present application or the background technology, the drawings required for use in the implementation methods of the present application or the background technology will be described below.

[0043] Figure 1 It is a structural schematic diagram of an electronic device provided in an embodiment of the present application;

[0044] Figure 2 yes Figure 1 The schematic diagram of a partial cross-sectional structure of an electronic device in one embodiment cut along AA is shown;

[0045] Figure 3 yes Figure 1 The structure diagram of the camera module shown in some embodiments;

[0046] Figure 4 yes Figure 3 The schematic diagram of the exploded structure of the camera module shown;

[0047] Figure 5 yes Figure 3 The camera module shown is a partial cross-sectional structural schematic diagram of an embodiment cut along BB;

[0048] Figure 6a yes Figure 3 A schematic diagram of light propagation of a camera module in some embodiments is shown;

[0049] Figure 6b yes Figure 6a A schematic diagram of the total reflection angle of the optical folding element shown;

[0050] Figure 7a yes Figure 3 Schematic diagram of light propagation of the camera module in other embodiments shown;

[0051] Figure 7b yes Figure 7a A schematic diagram of the total reflection angle of the optical folding element shown;

[0052] Figure 8 yes Figure 4 The schematic diagram of the structure of the optical folding element in some embodiments is shown;

[0053] Fig. 9 yes Figure 8 A schematic structural diagram of the optical folding element shown in another viewing angle;

[0054] Fig.10a yes Figure 8 The schematic structural diagram of the optical folding element shown in yet another viewing angle;

[0055] Fig.10b yes Figure 8 A schematic structural diagram of the optical folding element shown at another viewing angle;

[0056] Fig.11 yes Figure 8 A schematic structural diagram of the optical folding element shown at another viewing angle;

[0057] Fig.12 is a schematic diagram of the structure of a general optical folding element in some embodiments;

[0058] Fig.13 yes Fig.12 The schematic structural diagram of the optical folding element shown in another viewing angle;

[0059] Fig.14 yes Figure 8 A schematic structural diagram of the optical folding element shown in another viewing angle;

[0060] Fig.15 yes Figure 5 A schematic diagram of a cross-sectional structure of an optical folding element in another embodiment is shown;

[0061] Fig.16 yes Figure 5 A schematic diagram of a cross-sectional structure of an optical folding element in yet another embodiment is shown;

[0062] Fig.17 yes Fig. 9 A schematic diagram of a portion of the structure of the optical folding element at position C is shown;

[0063] Fig.18 yes Fig.17 The structure shown is a schematic diagram of the structure in other embodiments;

[0064] Fig.19 yes Fig.17 A schematic diagram of the structure shown in other embodiments;

[0065] Fig. 20 yes Fig.19 The structure shown is a schematic diagram of the structure in other embodiments;

[0066] Fig.21 yes Fig.17 The structure shown is a schematic diagram of the structure in other embodiments;

[0067] Fig. 22 yes Fig.17 The schematic diagram of the structure of the first groove in some embodiments is shown;

[0068] Fig.23 yes Figure 8 A schematic diagram of the preparation process of an optical folding element in some embodiments is shown;

[0069] Fig.24 yes Figure 8 The schematic diagram of the preparation process of the optical folding element in some embodiments is shown;

[0070] Fig.25 yes Fig.23 The flowchart of step S50 in some embodiments is shown;

[0071] Fig.26 yes Figure 1 The illustrated electronic device is a partial cross-sectional structural schematic diagram of another embodiment cut along AA;

[0072] Fig. 27 yes Fig.26 The schematic diagram of the structure of the optical folding element in some embodiments is shown;

[0073] Fig.28 yes Fig. 27 A schematic structural diagram of the optical folding element shown in another viewing angle;

[0074] Fig.29 It is a schematic diagram of the light propagation of local stray light in a general optical folding element;

[0075] Fig.30 yes Fig. 27 Schematic diagram of the light propagation of local area stray light in the optical folding element. DETAILED DESCRIPTION

[0076] The embodiments of the present application are described below in conjunction with the accompanying drawings in the embodiments of the present application.

[0077] In the description of the implementation mode of the present application, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Among them, "fixed connection" means that the two are connected to each other and the relative position relationship after the connection remains unchanged. The directional terms mentioned in the implementation mode of the present application, such as "upper", "lower", "inner", "outer", etc., are only referenced to the directions of the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the implementation mode of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the implementation mode of the present application. "Multiple" means at least two.

[0078] In the embodiments of the present application, the terms "first", "second", "third", and "fourth" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first", "second", "third", and "fourth" may explicitly or implicitly include one or more of the features.

[0079] In the implementation manner of the present application, "and / or" is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0080] References to "one embodiment" or "some embodiments" etc. described in this specification mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in another embodiment", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0081] It is to be understood that the specific implementations described herein are only used to explain the relevant invention, rather than to limit the invention. It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings.

[0082] Figure 1 It is a structural diagram of an electronic device 1000 provided in an embodiment of the present application. Figure 2 yes Figure 1 The illustrated diagram is a partial cross-sectional structural diagram of an electronic device 1000 in one embodiment cut along AA.

[0083] like Figure 1 and Figure 2 As shown, the electronic device 1000 may be a device with a camera module, such as a mobile phone, a tablet personal computer, a laptop computer, a personal digital assistant (PDA), a camera, a personal computer, a notebook computer, a vehicle-mounted device, a wearable device, augmented reality (AR) glasses, an AR helmet, virtual reality (VR) glasses or a VR helmet. Figure 1 The electronic device 1000 in the illustrated embodiment is described by taking a mobile phone as an example.

[0084] like Figure 1 and Figure 2 As shown, the electronic device 1000 may include a camera module 100, a device housing 200, a screen 300, and an image processor (not shown). The camera module 100 may be a rear camera module or a front camera module. It should be noted that Figure 1 The following figures and the related drawings only schematically illustrate some components of the electronic device 1000, and the actual shapes, sizes, positions and structures of these components are not limited to the following. Figure 1 In addition, when the electronic device 1000 is a device of some other form, the electronic device 1000 may not include the screen 300 .

[0085] For ease of description, the width direction of the electronic device 1000 is defined as the X axis. The length direction of the electronic device 1000 is defined as the Y axis. The thickness direction of the electronic device 1000 is defined as the Z axis. It is understood that the coordinate system setting of the electronic device 1000 can be flexibly set according to specific actual needs.

[0086] Exemplarily, the device housing 200 may include a frame 201 and a back cover 202. The back cover 202 is fixed to the frame 201. Exemplarily, the back cover 202 may be fixedly connected to the frame 201 by adhesive. The back cover 202 may also be an integrally formed structure with the frame 201, that is, the back cover 202 and the frame 201 are an integral structure.

[0087] In addition, the screen 300 may be located on a side of the frame 201 away from the back cover 202. In this case, the screen 300 and the back cover 202 are located on both sides of the frame 201. The screen 300, the frame 201 and the back cover 202 together enclose the interior of the electronic device 1000. The interior of the electronic device 1000 may be used to place components of the electronic device 1000, such as a battery, a receiver or a microphone. The screen 300 may be a flat screen or a curved screen.

[0088] For example, the camera module 100 may be located inside the electronic device 1000. The camera module 100 may be fixed to the side of the screen 300 facing the back cover 202. The back cover 202 may be provided with a light-transmitting hole 203. The shape of the light-transmitting hole 203 is not limited to the shape of the light-transmitting hole 203. Figure 1 The light-transmitting hole 203 connects the inside of the electronic device 1000 to the outside of the electronic device 1000. Light outside the electronic device 1000 can enter the inside of the electronic device 1000 through the light-transmitting hole 203. The camera module 100 can collect ambient light entering the inside of the electronic device 1000.

[0089] Exemplarily, the image processor can be connected to the camera module 100 for communication. The image processor can be used to obtain image data from the camera module 100 and process the image data. The communication connection between the camera module 100 and the image processor can include data transmission through electrical connection methods such as wiring, and data transmission can also be achieved through coupling and other methods. It is understandable that the camera module 100 and the image processor can also be connected to each other for communication through other methods that can achieve data transmission.

[0090] The function of the image processor is to optimize the digital image signal through a series of complex mathematical algorithms, and finally transmit the processed signal to the display. The image processor can be an image processing chip or a digital signal processing chip.

[0091] Understandably, Figure 1 The installation position of the camera module 100 in the electronic device 1000 of the illustrated embodiment is merely illustrative, and the present application does not strictly limit the installation position of the camera module 100. In some embodiments, the camera module 100 may also be installed at other positions of the electronic device 1000, for example, the camera module 100 may also be installed at the upper middle part or the upper right corner of the back of the electronic device 1000. In other embodiments, the electronic device 1000 may include a device body and an auxiliary component that can be rotated, moved or disassembled relative to the device body. In this case, the camera module 100 may also be set on the auxiliary component.

[0092] Figure 3 yes Figure 1The camera module 100 shown is a schematic structural diagram in some implementations. Figure 4 yes Figure 3 The exploded structural diagram of the camera module 100 is shown. Figure 5 yes Figure 3 The camera module 100 shown is a partial cross-sectional structural schematic diagram of an embodiment of the camera module 100 cut along line BB.

[0093] like Figures 3 to 5 As shown, the camera module 100 may include a motor 10, a lens 20, an optical folding element 30, a bracket 40, an image sensor 50, and a circuit component 60. The image sensor 50 may also be referred to as a photosensitive chip or a photosensitive element. The image sensor 50 may be used to collect ambient light and convert the image information carried by the ambient light into an electrical signal.

[0094] Exemplarily, the optical folding element 30 can be fixed to the inner side of the bracket 40. The motor 10 and the image sensor 50 can be located on the same side of the optical folding element 30, and both can be fixedly connected to the bracket 40. The lens 20 can be installed on the inner side of the motor 10. The motor 10 can drive the lens 20 to move in a direction close to or away from the optical folding element 30 to achieve optical focus. In some embodiments, the motor 10 can also have an optical image stabilization function. That is, the motor 10 can be an integrated motor that takes into account both optical image stabilization and focusing functions.

[0095] Exemplarily, the motor 10 can be electrically connected to the image sensor 50 via the circuit assembly 60. In some embodiments, the circuit assembly 60 can also include a connector (not shown), such as a board-to-board connector. The circuit assembly 60 can be electrically connected to a mainboard (not shown) of the electronic device 1000 via the connector.

[0096] For example, the light can be incident on the optical folding element 30 through the lens 20, and be reflected once or multiple times inside the optical folding element 30, and then be emitted from the optical folding element 30, and finally be imaged on the image sensor 50. In this way, before being imaged on the image sensor 50, the light can be reflected once or multiple times inside the optical folding element 30, so that the light path can be folded, effectively increasing the focal length of the camera module 100 and the total track length (TTL) of the optical system.

[0097] Figure 6a yes Figure 3 The illustrated diagram is a schematic diagram of light propagation of the camera module 100 in some embodiments. Figure 6b yes Figure 6a A schematic diagram of the total reflection angle of the optical folding element 30 is shown.

[0098] like Figure 6a and Figure 6b As shown, the optical folding element 30 can be made of a material with a higher refractive index. For example, a glass material with a high refractive index can be used, including but not limited to heavy lanthanum flint glass (such as ZLAF55D heavy lanthanum flint glass) and heavy crown glass (for example, H-ZF88 heavy crown glass). Among them, the refractive index n of the optical folding element 30 can be greater than or equal to 1.7. At this time, the total reflection angle of the light in the optical folding element 30 is small. Exemplarily, the total reflection angle can be less than or equal to 33°. In this embodiment, the refractive index n can be equal to 1.8, and the total reflection angle can be approximately equal to 33°.

[0099] It is understandable that, compared with an optical folding element with a smaller refractive index, in order to match its larger total reflection angle and reduce the influence of stray light, the volume of the optical folding element is usually larger, which is not conducive to realizing the miniaturization setting of the camera module. Even if the optical folding element reduces its own volume in order to meet the miniaturization setting, due to the smaller refractive index and larger total reflection angle, more stray light will be generated in the optical folding element, affecting the imaging effect of the camera module. The optical folding element 30 in this embodiment is prepared by using a material with a higher refractive index, so that the total reflection angle of light in the optical folding element 30 is smaller, thereby satisfying the imaging effect of the camera module 100 while compressing the volume of the optical folding element 30, which is conducive to realizing the miniaturization setting of the camera module 100. In other words, the optical folding element 30 in this embodiment can have a smaller volume while taking into account the imaging quality of the camera module 100.

[0100] Figure 7a yes Figure 3 The camera module 100 shown is a schematic diagram of light propagation in some other embodiments. Figure 7b yes Figure 7a Schematic diagram of the total reflection angle of the optical folding element shown.

[0101] like Figure 7a and Figure 7b As shown, the optical folding element 30 can also be made of resin material, or ordinary glass material (including but not limited to H-K9 glass, JGS1 fused silica glass). The refractive index n of the optical folding element 30 can be less than 1.7. At this time, the total reflection angle of the light in the optical folding element 30 is relatively large, and the total reflection angle can be greater than 33°. Exemplarily, the refractive index n can be equal to 1.5. The total reflection angle is approximately equal to 42°.

[0102] It can be understood that the optical folding element 30 in this embodiment is made of resin or other glass materials with a low refractive index, which makes the optical folding element 30 easy to prepare and helps to reduce the preparation cost of the optical folding element 30.

[0103] The present application can effectively eliminate stray light by improving the structure of the optical folding element 30, while not affecting effective light imaging, and the imaging quality is high. The specific structure of the optical folding element 30 will be described below in conjunction with the relevant drawings.

[0104] Figure 8 yes Figure 4 The illustrated structure of the optical folding element 30 in some embodiments. Fig. 9 yes Figure 8 The structure of the optical folding element 30 shown is schematically shown at another viewing angle. Fig.10a yes Figure 8 The optical folding element 30 is shown as a schematic structural diagram at another viewing angle. Fig.10b yes Figure 8 The optical folding element 30 shown is a schematic structural diagram at another viewing angle.

[0105] like Figures 8 to 10b As shown, the optical folding element 30 may include a first surface 31 and a second surface 32 that are disposed opposite to each other. The first surface 31 may be parallel to the second surface 32, and arranged with the second surface 32 in the height direction of the optical folding element 30 (that is, the Z-axis direction in this embodiment). The first surface 31 may be disposed closer to the lens 20 than the second surface 32. At this time, the first surface 31 may constitute the top surface of the optical folding element 30. The second surface 32 may constitute the bottom surface of the optical folding element 30. Exemplarily, in the length direction of the optical folding element 30 (that is, the X-axis direction in this embodiment), the size of the first surface 31 may be greater than the size of the second surface 32.

[0106] Exemplarily, the optical folding element 30 may further include a first side surface 33, a second side surface 34, a third side surface 35, and a fourth side surface 36. The first side surface 33 may be arranged opposite to the second side surface 34. The third side surface 35 may be arranged opposite to the fourth side surface 36. The first side surface 33, the third side surface 35, the second side surface 34, and the fourth side surface 36 may be connected end to end in sequence. The first side surface 33, the second side surface 34, the third side surface 35, and the fourth side surface 36 may all be connected between the first surface 31 and the second surface 32. The first side surface 33 and the second side surface 34 may be arranged in the width direction of the optical folding element 30 (that is, the Y-axis direction in this embodiment). The direction from the first side surface 33 to the second side surface 34 may be the first direction Y. That is, the first direction Y may be the width direction of the optical folding element 30. The third side surface 35 and the fourth side surface 36 may be arranged in the length direction of the optical folding element 30 (that is, the X-axis direction in this embodiment). The direction from the third side surface 35 to the fourth side surface 36 may be the second direction X. That is, the second direction X may be the length direction of the optical folding element 30.

[0107] Exemplarily, both the first side surface 33 and the second side surface 34 may be arranged at an angle with the first surface 31. The angle formed between the first side surface 33 and the first surface 31 may be greater than 90°. The angle formed between the second side surface 34 and the first surface 31 may be greater than 90°. The first side surface 33 and the second side surface 34 may be arranged at an angle. The distance between the first side surface 33 and the second side surface 34 may increase in a direction approaching the second surface 32. Among them, the angle formed between the first side surface 33 and the first surface 31 may be equal to the angle formed between the second side surface 34 and the first surface 31.

[0108] Exemplarily, the angle α1 formed between the first side surface 33 and the first surface 31 may be in the range of 100° to 130°. In some embodiments, the angle α1 formed between the first side surface 33 and the first surface 31 may be in the range of 110° to 120°.

[0109] In other embodiments, the first side surface 33 may also be arranged parallel to the second side surface 34 .

[0110] like Figures 8 to 10b As shown, the third side surface 35 and the fourth side surface 36 can be set at an angle with the first surface 31. The angle formed between the third side surface 35 and the first surface 31 can be less than 90°. The angle formed between the fourth side surface 36 and the first surface 31 can be less than 90°. The third side surface 35 can be set at an angle with the fourth side surface 36. The distance between the third side surface 35 and the fourth side surface 36 can increase in the direction approaching the second surface 32. Among them, the angle formed between the third side surface 35 and the first surface 31 can be equal to the angle formed between the fourth side surface 36 and the first surface 31.

[0111] Exemplarily, the angle α2 formed between the third side surface 35 and the first surface 31 may be in the range of 20° to 40°. In some embodiments, the angle α2 formed between the third side surface 35 and the first surface 31 may also be in the range of 26° to 36°.

[0112] Exemplarily, the connection between the third side surface 35 and the first surface 31 may further include a first transition surface 351. The first transition surface 351 may be connected between the third side surface 35 and the first surface 31. The first transition surface 351 may be perpendicular to the first surface 31. The first transition surface 351 may connect the first side surface 33 and the second side surface 34. The connection between the fourth side surface 36 and the first surface 31 may further include a second transition surface 361. The second transition surface 361 may be connected between the fourth side surface 36 and the first surface 31. The second transition surface 361 may be perpendicular to the first surface 31.

[0113] Exemplarily, the connection between the first side surface 33 and the second surface 32 may further include a third transition surface 331. The third transition surface 331 may be connected between the first side surface 33 and the second surface 32. The third transition surface 331 may be perpendicular to the second surface 32. The connection between the second side surface 34 and the second surface 32 may further include a fourth transition surface 341. The fourth transition surface 341 may be connected between the second side surface 34 and the second surface 32. The fourth transition surface 341 may be perpendicular to the second surface 32.

[0114] In other embodiments, the optical folding element 30 may not include any one or more of the first transition surface 351 , the second transition surface 361 , the third transition surface 331 , and the fourth transition surface 341 .

[0115] like Figures 8 to 10b As shown, the optical folding element 30 may have an incident surface 30a and an exit surface 30b. Both the incident surface 30a and the exit surface 30b may be formed on the first surface 31 of the optical folding element 30. That is, the first surface 31 may include the incident surface 30a and the exit surface 30b. The incident surface 30a and the exit surface 30b may be located on the same side of the optical folding element 30. The incident surface 30a and the exit surface 30b may be arranged in a first direction Y. The first direction Y may be parallel to the X-axis direction, that is, the length extension direction of the optical folding element 30. After the light enters the interior of the optical folding element 30 from the incident surface 30a, the light may be reflected multiple times inside the optical folding element 30 and finally emitted from the exit surface 30b. In other words, the incident surface 30a and the exit surface 30b may be transmission surfaces for optical signal transmission in the optical folding element 30. Among them, the reflection of the light inside the optical folding element 30 may be ordinary reflection or total reflection. Exemplarily, when the incident angle of the light is close to or greater than the critical angle of the optical folding element 30, the light may be totally reflected (TIR) ​​inside the optical folding element 30. It should be noted that, Figure 8 In the following figures, the incident surface 30a and the exit surface 30b are indicated by dotted lines.

[0116] Exemplarily, the optical folding element 30 may also include one or more reflective surfaces. The reflective surface may be formed by providing a reflective material on the surface of the optical folding element 30 (for example, by coating a reflective coating / adhering a reflective film, etc.). In this embodiment, the number of reflective surfaces may be three, for example, including a first reflective surface 371, a second reflective surface 372, and a third reflective surface 373. Among them, the first reflective surface 371 may be formed on the third side surface 35. The second reflective surface 372 may be formed on the fourth side surface 36. The third reflective surface 373 may be formed on the first surface 31 and located between the incident surface 30a and the exit surface 30b. At this time, both the first reflective surface 371 and the second reflective surface 372 may be located on the image side of the incident surface 30a. The third reflective surface 373 and the incident surface 30a may be located on the same side of the optical folding element 30. The angle formed between the first reflective surface 371 and the incident surface 30a may be equal to the angle α2 between the third side surface 35 and the first surface 31.

[0117] Exemplarily, the third side surface 35 may be entirely provided with a reflective material to form a first reflective surface 371. That is, the first reflective surface 371 may completely overlap with the third side surface 35. The fourth side surface 36 may also be entirely provided with a reflective material to form a second reflective surface 372. That is, the second reflective surface 372 may completely overlap with the fourth side surface 36. Among them, an angle less than 90° may be formed between the first reflective surface 371 and the incident surface 30a. An angle less than 90° may be formed between the second reflective surface 372 and the incident surface 30a. The angle formed between the first reflective surface 371 and the incident surface 30a may be equal to the angle formed between the second reflective surface 372 and the incident surface 30a. The distance between the first reflective surface 371 and the second reflective surface 372 may increase in a direction close to the first surface 31.

[0118] For example, the projection of the first reflective surface 371 on the plane where the first surface 31 is located can overlap with at least a portion of the incident surface 30a. The projection of the second reflective surface 372 on the plane where the first surface 31 is located can overlap with at least a portion of the exit surface 30b. In this way, after the light enters the interior of the optical folding element 30 from the incident surface 30a, it can be reflected by one or more of the first reflective surface 371, the second reflective surface 372, and the third reflective surface 373, and finally imaged on the image sensor 50 (combined with Figure 5 as shown).

[0119] In some embodiments, the third side surface 35 may be provided with a reflective material only in a partial area (e.g., the central area of ​​the third side surface 35) to form a first reflective surface 371. In this case, a portion of the third side surface 35 that does not overlap with the first reflective surface 371 may also be provided with light-absorbing ink to absorb stray light and improve imaging quality.

[0120] In other embodiments, the emission surface 30b may also be located on the second surface 32. The first reflection surface 371 may also be arranged parallel to the second reflection surface 372.

[0121] like Figures 8 to 10b As shown, the optical folding element 30 may further include a light blocking layer 38. The light blocking layer 38 may be located between the third side surface 35 and the fourth side surface 36, that is, between the first reflective surface 371 and the second reflective surface 372. The light blocking layer 38 may be connected to the second surface 32 and spaced apart from the first surface 31. A light passing area 30c (combined with the light blocking layer 38) may be formed between the light blocking layer 38 and the first surface 31. Figure 5 Thus, by providing a light blocking layer 38 inside the optical folding element 30 to block the light, it is possible to prevent stray light outside the light passing area 30c from passing through and being imaged on the image sensor 50, thereby affecting the imaging quality.

[0122] Exemplarily, the optical folding element 30 may also have a light-blocking groove 381. The opening of the light-blocking groove 381 may be formed on the second surface 32, the first side surface 33, and the second side surface 34. At this time, the light-blocking groove 381 may be recessed toward the inside of the optical folding element 30. The groove surface 382 of the light-blocking groove 381 may be coated / pasted with a reflective material so that the groove surface 382 of the light-blocking groove 381 can reflect light to form a light-blocking layer 38.

[0123] Exemplarily, the groove surface 382 of the light blocking groove 381 may include a first groove side surface 3821 and a second groove side surface 3822 that are arranged opposite to each other, and a groove top surface 3823 (combined with the first groove side surface 3821 and the second groove side surface 3822) connected between the first groove side surface 3821 and the second groove side surface 3822. Figure 5 ). The first groove side surface 3821 can be arranged parallel to the second groove side surface 3822. The groove top surface 3823 can be in an arc shape. In this way, the shape of the light blocking groove 381 is easy to process, which is conducive to reducing the difficulty of processing. In other embodiments, the groove top surface 3823 can also be a plane. The groove top surface 3823 can be parallel to the second surface 32.

[0124] Fig.11 yes Figure 8 The optical folding element 30 shown is a schematic structural diagram at another viewing angle.

[0125] like Figure 8 and Fig.11As shown, the optical folding element 30 may include a plurality of first grooves 391. The plurality of first grooves 391 may be distributed on the first side surface 33 and / or the second side surface 34. Among them, the first groove 391 may be in the shape of an elongated strip. The projection of the first groove 391 on the first plane M is the first projection. The first plane M may be perpendicular to the first direction Y (in this embodiment, it is perpendicular to the direction from the first side surface 33 to the second side surface 34, that is, perpendicular to the Y-axis direction). In this embodiment, the first plane M may be an XZ plane. The length extension direction of the first projection may be set at an angle to the normal direction of the incident surface 30a (in this embodiment, it is also the normal direction of the first surface 31, that is, the Z-axis direction). Among them, the angle β1 formed between the length extension direction of the first projection and the incident surface 30a may be less than or equal to 50°. Exemplarily, the angle β1 formed between the length extension direction of the first projection and the incident surface 30a may be less than or equal to 15°. For example, the angle β1 formed between the length extension direction of the first projection and the incident surface 30a may be 3°, 10°, etc.

[0126] Exemplarily, the angle β2 formed between the length extension direction of the first projection and the first surface 31 may be greater than 90°. The opening of the angle β2 may be toward the first reflection surface 371. At this time, the first projection may be inclined toward the first reflection surface 371.

[0127] Exemplarily, the groove surface 391a of the first groove 391 may be a reflective surface, for example, by coating / pasting a reflective material on the groove surface 391a of the first groove 391 so that the groove surface 391a of the first groove 391 can reflect light. When light is transmitted to the groove surface 391a of the first groove 391, the light may be reflected by the groove surface 391a of the first groove 391.

[0128] Exemplarily, a portion of the plurality of first grooves 391 may be located on the first side 33, and another portion may be located on the second side 34. The plurality of first grooves 391 located on the first side 33 may constitute a first group of grooves. The openings of the plurality of first grooves 391 of the first group of grooves may be formed on the first side 33. The plurality of first grooves 391 located on the second side 34 may constitute a second group of grooves. The openings of the plurality of first grooves 391 of the second group of grooves may be formed on the second side 34. The first group of grooves and the second group of grooves may be symmetrical structures.

[0129] Exemplarily, taking the first group of grooves as an example, the projection area of ​​the first group of grooves on the first side surface 33 may be greater than or equal to 50% of the area of ​​the first side surface 33. The first group of grooves may be located in the middle of the first side surface 33. The first group of grooves may be spaced apart from the first transition surface 351 and the second transition surface 361. In this way, the plurality of first grooves 391 in the first group of grooves may be concentrated in the area where the first side surface 33 reflects stray light, thereby reducing the number of the first grooves 391, which is conducive to saving preparation costs. In some embodiments, the plurality of first grooves 391 in the first group of grooves may also completely cover the first side surface 33.

[0130] Exemplarily, the plurality of first grooves 391 in the first group of grooves may all be connected to the first surface 31. A portion of the plurality of first grooves 391 in the first group of grooves may also be connected to the third side surface 35, a portion may also be connected to the third transition surface 331, and a portion may also be connected to the fourth side surface 36. In some embodiments, when the optical folding element 30 does not have the third transition surface 331, a portion of the plurality of first grooves 391 in the first group of grooves may also be connected to the second surface 32.

[0131] Exemplarily, the optical folding element 30 may further include a first light absorbing layer (not shown). The first light absorbing layer may be fixedly connected to the groove surface 391a of the first groove 391 and cover at least part of the groove surface 391a of the first groove 391. For example, the light absorbing layer may be formed by coating light absorbing ink on the groove surface 391a of the first groove 391 or by providing a light absorbing film layer. In this way, when light is transmitted to the groove surface 391a of the first groove 391, at least part of the energy of the light may be absorbed by the first light absorbing layer, thereby reducing the intensity of the light.

[0132] Fig.12 is a schematic diagram of the structure of a general optical folding element 500 in some embodiments. Fig.13 yes Fig.12 The optical folding element 500 shown is a schematic structural diagram at another viewing angle.

[0133] When the user takes a photo, light from the external environment can enter the interior of the optical folding element through the incident surface of the optical folding element. The light entering the optical folding element may include a first light and a second light. The first light can be effective light in the shooting area. The second light can be stray light outside the shooting area. After the first light enters the interior of the optical folding element from the incident surface, it can be reflected by the reflective surface, and finally emitted from the optical folding element by the exit surface and imaged on the image sensor. After the second light enters the interior of the optical folding element from the incident surface, it will be transmitted to the first side or the second side of the optical folding element.

[0134] like Fig.12 and Fig.13As shown, in a general optical folding element 500, a portion of the stray light in the second light will pass through the incident surface (not shown) located on the top surface 501 to the first reflective surface 502, and will be reflected by the first reflective surface 502 to the first side surface 503 or the second side surface 504, and will then be reflected by the first side surface 503 or the second side surface 504 to the second reflective surface 505 located on the top surface 501, and will be reflected by the second reflective surface 505 to the third reflective surface 506, and will then be reflected by the third reflective surface 506 to the exit surface (not shown) located on the top surface 501, and will be emitted from the exit surface to finally be imaged on the image sensor. A portion of the stray light in the second light will be emitted from the incident surface located on the top surface 501 to the first reflection surface 502, reflected by the first reflection surface 502 to the second reflection surface 505 located on the top surface 501, reflected by the second reflection surface 505 to the third reflection surface 506, and then reflected by the third reflection surface 506 to the exit surface located on the top surface 501, and emitted from the exit surface, and finally imaged on the image sensor. At this time, the stray light will interfere with the imaging quality and affect the user experience.

[0135] In this embodiment, the optical folding element 30 (such as Fig.10a and Fig.11 As shown in the figure, a plurality of first grooves 391 are arranged on the side surfaces (including the first side surface 33 and the second side surface 34), and the projection of the first grooves 391 on the first plane M can be arranged at an angle relative to the normal direction of the incident surface 30a. In this way, when the second light is transmitted to the side surface of the optical folding element 30, the second light can be reflected in the direction toward the incident surface 30a under the action of the groove surface 391a of the first groove 391. That is, after the second light transmitted to the side surface in the optical folding element 30 of this embodiment is reflected by the groove surface 391a of the first groove 391, it will not be emitted from the exit surface 30b and imaged on the image sensor, thereby effectively reducing the influence of stray light on the imaging quality, which is beneficial to improving the user's shooting experience.

[0136] Secondly, in the present embodiment, the angle β2 formed between the first groove 391 in the longitudinal extension direction of the projection of the first plane M and the first surface 31 can be greater than 90°, and the opening of the angle β2 can be oriented toward the first reflective surface 371. In this way, the first groove 391 can be inclined in the direction toward the first reflective surface 371. When the second light is reflected by the first reflective surface 371 and transmitted to the groove surface 391a of the first groove 391, the incident angle between the second light and the groove surface 391a of the first groove 391 is small, so that the second light can be reflected to the first reflective surface 371 or the second surface 32 under the action of the groove surface 391a of the first groove 391, and finally reflected in the direction toward the incident surface 30a under the action of the first reflective surface 371 or the second surface 32. That is, in the present embodiment, by setting the first end 391b of the first groove 391 to be inclined in the direction close to the first reflective surface 371 compared with the second end 391c, the stray light entering the optical folding element 30 can be better eliminated, which is conducive to reducing the influence of the stray light on the imaging quality.

[0137] In addition, the optical folding element 30 in this embodiment may further include a first light absorbing layer. The first light absorbing layer may be provided on the groove surface 391a of the first groove 391. In this way, after the stray light is projected onto the groove surface 391a of the first groove 391, at least part of the energy of the stray light can be absorbed by the first light absorbing layer, which can effectively reduce the energy of the stray light and reduce the influence of the stray light on the imaging quality, which is beneficial to improving the user's shooting experience. At the same time, the first end 391b of the first groove 391 is inclined in a direction close to the first reflective surface 371 compared to the second end 391c, so that the incident angle between the stray light transmitted to the first groove 391 and the groove surface 391a of the first groove 391 is small, so that most of the energy of the stray light can be absorbed by the first light absorbing layer, thereby effectively eliminating the influence of the stray light on the imaging quality.

[0138] In addition, the first side surface 33 of the optical folding element 30 in the present embodiment can be set at an angle with the incident surface 30a. The distance between the first side surface 33 and the second side surface 34 can increase in the direction close to the second surface 32. In this way, when the second light is transmitted to the first side surface 33, the second light can be reflected by the first side surface 33 to the bottom surface of the optical folding element 30 (that is, the second surface 32 in the present embodiment), so that the second light can be effectively avoided from being imaged, which is beneficial to reduce the influence of stray light on the imaging quality. At the same time, the projection of the first groove 391 on the first plane M is set at an angle relative to the normal direction of the incident surface 30a, which can further adapt to the optical folding element 30 with a narrow upper and wide lower structure, so that the stray light entering the optical folding element 30 can be better eliminated, the influence of stray light on the imaging quality can be reduced, and the user experience can be improved.

[0139] Fig.14 yes Figure 8The structure of the optical folding element 30 shown is schematically shown at another viewing angle.

[0140] like Figure 8 and Fig.14 As shown, the optical folding element 30 may further include a plurality of second grooves 392. The plurality of second grooves 392 may be distributed on the second surface 32. The openings of the plurality of second grooves 392 may be formed on the second surface 32. Exemplarily, the second groove 392 may also connect the first side surface 33 and the second side surface 34.

[0141] Exemplarily, the length extension direction of the second groove 392 may be parallel to the first direction Y (i.e., the Y-axis direction in this embodiment). A plurality of second grooves 392 may be evenly distributed on the second surface 32. A portion of the plurality of second grooves 392 may be located on a side of the light blocking groove 381 close to the third side 35, and another portion may be located on a side of the light blocking layer 38 close to the fourth side 36. In some embodiments, the length extension direction of the second groove 392 may also intersect with the first direction Y. The angle formed between the length extension direction of the second groove 392 and the first direction Y may be less than or equal to 10°.

[0142] Exemplarily, the groove surface 392a of the second groove 392 may be a reflective surface. For example, a reflective material may be applied / pasted on the groove surface 392a of the second groove 392 so that the groove surface 392a of the second groove 392 can reflect light. When light is transmitted to the groove surface 392a of the second groove 392, the light may be reflected by the groove surface 392a of the second groove 392.

[0143] Exemplarily, the optical folding element 30 may further include a second light absorbing layer (not shown). The second light absorbing layer may be disposed on the groove surface 392a of the second groove 392, and may cover at least a portion of the groove surface 392a of the second groove 392. For example, the light absorbing layer may be formed by coating a light absorbing ink on the groove surface 392a of the second groove 392 or by providing a light absorbing film layer. In this way, when light is transmitted to the groove surface 392a of the second groove 392, at least part of the energy of the light may be absorbed by the second light absorbing layer, thereby reducing the intensity of the light.

[0144] It can be understood that the optical folding element 30 in this embodiment is provided with a plurality of second grooves 392 on the bottom surface (i.e., the second surface 32 in this embodiment) of the optical folding element 30, and the groove surface 392a of the second groove 392 can reflect light. In this way, when stray light is reflected to the second surface 32, the stray light can be reflected by the groove surface 392a of the second groove 392 and transmitted in the direction toward the incident surface 30a. That is, the stray light reflected by the groove surface 392a of the second groove 392 will not be emitted by the exit surface 30b in the end and imaged on the image sensor 50, thereby effectively reducing the influence of stray light on the imaging quality, which is conducive to improving the user's shooting experience.

[0145] Fig.15 yes Figure 5 The illustrated schematic diagram is a cross-sectional structure of an optical folding element 30 in another embodiment.

[0146] like Fig.15 As shown, the structure of the optical folding element 30 in this embodiment is similar to Figure 8 The structures of the optical folding element 30 shown are substantially the same, and the same parts are not repeated. The following introduces some differences between the two. Exemplarily, the optical folding element 30 may also include a plurality of third grooves 393. The plurality of third grooves 393 may be distributed on the groove top surface 3823 of the light blocking groove 381. The openings of the plurality of third grooves 393 may be formed on the groove top surface 3823. Among them, the third groove 393 may be in the shape of an elongated strip. The length extension direction of the third groove 393 may be parallel to the first direction Y (i.e., the Y-axis direction in this embodiment). The plurality of third grooves 393 may be distributed on the groove top surface 3823 of the light blocking groove 381. The groove surface 393a of the third groove 393 may be a reflective surface. For example, a reflective material may be applied / pasted on the groove surface 393a of the third groove 393 so that the groove surface 393a of the third groove 393 can reflect light. When light is transmitted to the groove surface 393a of the third groove 393, the light may be reflected by the groove surface 393a of the third groove 393.

[0147] Exemplarily, the optical folding element 30 may further include a third light absorbing layer (not shown). The third light absorbing layer may be provided on the groove surface 393a of the third groove 393, and cover at least part of the groove surface 393a of the third groove 393. For example, the light absorbing layer may be formed by coating a light absorbing ink on the groove surface 393a of the third groove 393 or by providing a light absorbing film layer. In this way, when light is transmitted to the groove surface 393a of the third groove 393, at least part of the energy of the light may be absorbed by the third light absorbing layer, thereby reducing the intensity of the light.

[0148] It can be understood that the optical folding element 30 in this embodiment further includes a plurality of third grooves 393. The plurality of third grooves 393 can be located on the groove top surface 3823 of the light blocking groove 381. In this way, when stray light is directed toward the groove top surface 3823 of the light blocking groove 381, the stray light can be reflected in the direction toward the incident surface 30a under the action of the groove surface 393a of the third groove 393, thereby effectively avoiding the stray light from being imaged on the image sensor, which is beneficial to reducing the influence of stray light on the imaging quality and improving the user's shooting experience.

[0149] In some embodiments, Fig.16 As shown, Fig.16 yes Figure 5 FIG. 1 is a schematic diagram of a cross-sectional structure of an optical folding element 30 in another embodiment. Figure 8 The structure of the optical folding element 30 shown is substantially the same, and the same parts are not repeated. Exemplarily, the groove top surface 3823 of the light blocking groove 381 may include a first top surface 3831 and a second top surface 3832 set at an angle. The angle α3 formed between the first top surface 3831 and the second top surface 3832 may be in the range of 20° to 120°. Exemplarily, the angle formed between the first top surface 3831 and the second top surface 3832 may be an acute angle. In this way, compared with the arc-shaped groove top surface 3823 of the light blocking groove 381, when stray light is directed toward the groove top surface 3823 of the light blocking groove 381 (for example, when directed toward the vertex of the groove top surface 3823), it will be reflected in the direction toward the exit surface 30b under the action of the groove top surface 3823, so that the stray light is imaged on the image sensor, reducing the imaging quality. In the present embodiment, a first top surface 3831 and a second top surface 3832 which are arranged at an angle are formed on the groove top surface 3823, so that the groove top surface 3823 can reflect stray light directed toward itself in the direction toward the incident surface 30a, thereby effectively avoiding the stray light directed toward the groove top surface 3823 from being reflected to the exit surface 30b, which is beneficial to reducing the influence of stray light on imaging quality and ensuring imaging quality.

[0150] In other embodiments, the optical folding element 30 may also be a glued prism. In this case, the optical folding element 30 may include a first sub-section (not shown) and a second sub-section (not shown) that are independent of each other. The first sub-section may be fixed to the second sub-section by gluing. In this way, by coating / pasting a light-shielding material on the gluing surface of the first sub-section and / or the second sub-section, a light-blocking layer 38 may be formed. In some other embodiments, the optical folding element 30 may not have a light-blocking layer 38.

[0151] The above specifically introduces the structure of the optical folding element 30 , and the following will specifically introduce the shape structure of the first groove 391 of the optical folding element 30 in conjunction with the relevant drawings.

[0152] Fig.17 yes Fig. 9 The schematic diagram of the partial structure of the optical folding element 30 shown is at C.

[0153] like Fig. 9 and Fig.17 As shown, the groove surface 391a of the first groove 391 may include a first groove surface 3911 and a second groove surface 3912 that are arranged opposite to each other. The first groove surface 3911 and the second groove surface 3912 may both be reflective surfaces. The first groove surface 3911 and the second groove surface 3912 may be arranged at an angle. The first groove surface 3911 of one of the two adjacent first grooves 391 may be connected to the second groove surface 3912 of the other first groove 391, that is, the plurality of first grooves 391 may be arranged close to each other. At this time, the plurality of first grooves 391 may form a serrated structure together. Exemplarily, the shapes, sizes, and structures of the plurality of first grooves 391 may be exactly the same.

[0154] Exemplarily, the angle β3 formed between the first groove surface 3911 and the second groove surface 3912 may be in the range of 30° to 110°. In the present embodiment, the angle β3 formed between the first groove surface 3911 and the second groove surface 3912 may be 90°, that is, the first groove surface 3911 may be perpendicular to the second groove surface 3912. The first groove surface 3911 and the second groove surface 3912 may be completely perpendicular or approximately perpendicular within the range allowed by the machining error. For example, when the angle β3 formed between the first groove surface 3911 and the second groove surface 3912 is in the range of 85° to 95°, the first groove surface 3911 and the second groove surface 3912 may be considered perpendicular.

[0155] Exemplarily, the width of the first groove surface 3911 may be a first width D1. The width of the second groove surface 3912 may be a second width D2. Both the first width D1 and the second width D2 may be greater than or equal to 10 microns. Exemplarily, the first width D1 may be in the range of 10 microns to 100 microns. In this way, the width of the first groove surface 3911 is relatively moderate. On the one hand, it can avoid that the width of the first groove surface 3911 is too small, resulting in excessive mechanical stress when processing the first groove 391, which is not conducive to processing. At the same time, when processing the first groove 391, the surface shape of the first groove surface 3911 can be ensured, which is conducive to improving the processing accuracy; on the other hand, it can avoid that the width of the first groove surface 3911 is too large, resulting in increased preparation costs, which is not conducive to reducing the preparation cost of the entire optical folding element 30. In some embodiments, the first width D1 may be in the range of 10 microns to 500 microns.

[0156] In this embodiment, the width of the first groove surface 3911 may be equal to the width of the second groove surface 3912. At this time, the cross section of the second groove 392 in the XY plane may be substantially an isosceles right triangle.

[0157] It can be understood that the angle β3 formed between the first groove surface 3911 and the second groove surface 3912 of the first groove 391 in this embodiment can be 90°, and the width of the first groove surface 3911 can be equal to the width of the second groove surface 3912. In this way, stray light at any angle directed to the second surface 32 of the optical folding element 30 can be returned to the first surface 31 under the effect of one or two reflections of the first groove surface 3911 and / or the second groove surface 3912 of the first groove 391, thereby effectively avoiding stray light from being imaged on the image sensor 50, which is beneficial to reducing the influence of stray light and improving the imaging quality of the camera module 100.

[0158] In some embodiments, the connection between the first groove surface 3911 and the second groove surface 3912 of the first groove 391 may also have a rounded corner. In this case, the height of the triangle where the first groove surface 3911 and the second groove surface 3912 are located is H1 (combined with Fig. 9 ). The radius of the fillet may be less than or equal to 10% of the height H1 of the triangle where the first groove surface 3911 and the second groove surface 3912 are located. By way of example, the radius of the fillet may be less than or equal to 10 microns. In this way, the cross-section of the first groove 391 may be roughly triangular, which may better reflect stray light directed toward the first side surface 33 in the direction toward the incident surface 30a, avoid stray light imaging, and help ensure imaging quality. By way of example, the height H1 of the triangle where the first groove surface 3911 and the second groove surface 3912 are located may be the distance between the intersection of the first groove surface 3911 and the second groove surface 3912 and the opening of the second groove 392.

[0159] In other embodiments, Fig.18 As shown, Fig.18 yes Fig.17 The structure shown in FIG. 1 is a schematic diagram of a structure in other embodiments. Two adjacent second grooves 392 can be spaced apart along the arrangement direction of the two. The spacing between two adjacent first grooves 391 can be less than or equal to the height H1 of the triangle where the first groove surface 3911 and the second groove surface 3912 are located (combined with Fig. 9 In this case, the two adjacent second grooves 392 can still be regarded as being arranged closely together. Among them, the connecting surface 394 between the two adjacent first grooves 391 can be a plane. In this way, the distance between the two adjacent first grooves 391 is relatively close, so that the stray light directed to the second surface 32 can be more reflected by the groove surface 392a of the second groove 392, thereby reducing the influence of the stray light on the imaging quality and improving the user's shooting experience.

[0160] In other embodiments, Fig.19 As shown, Fig.19 yes Fig.17 The structure shown is a schematic diagram of the structure in other embodiments. The connecting surface 394 between two adjacent first grooves 391 can also be a curved surface. The center of curvature of the curved surface can be located inside the optical folding element 30.

[0161] In other embodiments, Fig. 20 As shown, Fig. 20 yes Fig.19 The structure shown is a schematic diagram of a structure in other embodiments. The angle β3 formed between the first groove surface and the second groove surface of the first groove 391 can also be 30°.

[0162] In other embodiments, Fig.21 As shown, Fig.21 yes Fig.17 The structure shown is a schematic diagram of the structure in other embodiments. The multiple first grooves 391 can also have the same shape but different sizes. For example, the depth of one of the two adjacent first grooves 391 (that is, the height of the triangle where the first groove surface and the second groove surface are located in this embodiment) can be less than the depth of the other first groove 391.

[0163] In some embodiments, Fig. 22 As shown, Fig. 22 yes Fig.17 The first groove 391 shown is a schematic diagram of the structure of some embodiments. The first groove surface 3911 and the second groove surface 3912 of the first groove 391 can also be arc surfaces. The center of curvature of the first groove surface 3911 and the center of curvature of the second groove surface 3912 can be located on opposite sides of the first groove 391.

[0164] It should be understood that the shape, arrangement and other features of the first groove 391 can be combined with each other. In addition, the shape, arrangement and other features of the second groove 392 and the third groove 393 can also be set with reference to the first groove 391, and will not be repeated here.

[0165] Fig.23 yes Figure 8 The illustrated diagram is a schematic diagram of the preparation process of the optical folding element 30 in some embodiments. Fig.24 yes Figure 8 The illustrated diagram is a schematic diagram of the preparation process of the optical folding element 30 in some embodiments.

[0166] like Fig.23 and Fig.24As shown, the first groove 391, the second groove and the third groove 393 in the optical folding element 30 can be prepared by laser shaping (laser carving). Taking the processing of the first groove 391 as an example, the wavelength, surface shape, processing depth of the laser and the moving speed of the carrier carrying the initial prism can be selected according to the material of the optical folding element 30, the size of the first groove 391 and other parameters, and the side of the optical folding element 30 (that is, the first side 33 and the second side 34 in this embodiment) can be laser carved to form a plurality of first grooves 391 arranged in an array. Then, a light-absorbing ink can be coated on the groove surface 391a of the first groove 391 to form a first light-absorbing layer 395. Among them, the first light-absorbing layer 395 can completely cover the groove surface 391a of the first groove 391. It can be understood that the first groove 391 in the present embodiment is prepared by laser engraving, which can effectively improve the processing accuracy of the first groove 391, so that the fillet radius of the connection between the first groove surface 3911 and the second groove surface 3912 of the first groove 391 is smaller, so that the cross-section of the first groove 391 can be roughly triangular, thereby ensuring the shape of the cross-section of the first groove 391 and improving the ability of the first groove 391 to eliminate stray light.

[0167] For example, laser subtraction can be used to prepare different grooves (including the first groove 391, the second groove and the third groove 393) of the optical folding element 30 in a surface-by-surface, groove-by-groove, or layer-by-layer manner, and the processing efficiency can also be improved by beam shaping and beam splitting in parallel. The preparation method of the optical folding element 30 may include but is not limited to the following steps S10 to S50:

[0168] S10: The prism to be processed is loaded, and the processing surface of the prism to be processed is perpendicular to the laser beam.

[0169] S20: Capturing the posture of the prism to be processed.

[0170] For example, the edge contour of the prism to be processed or the mark on the surface of the prism to be processed can be captured based on the vision module to achieve the posture capture of the prism to be processed.

[0171] S30: Perform laser focusing on the surface to be processed.

[0172] For example, laser focusing on the surface to be processed can be achieved based on a CCD (charge coupled device) camera / rangefinder.

[0173] S40: Clean the prism to be processed.

[0174] For example, the prism to be processed can be cleaned by blowing, flushing, etc.

[0175] S50: forming grooves on the surface to be processed by laser scanning to form an optical folding element.

[0176] In some embodiments, Fig.25 As shown, Fig.25 yes Fig.23 The flowchart of step S50 in some embodiments is shown. When the prism to be processed has multiple surfaces to be processed, step S50 may also include the following steps S51 to S53:

[0177] S51: Laser scans the first surface to be processed.

[0178] S52: Changing the second surface to be processed to be perpendicular to the laser beam. For example, the second surface to be processed can be changed to the processing position and perpendicular to the laser beam by using an automatic switching tool.

[0179] S53: Laser scans the second surface to be processed.

[0180] It should be understood that when the prism to be processed further includes a third surface to be processed or more surfaces to be processed, the above steps S52 and S53 can be repeated in a loop to complete laser scanning of the multiple surfaces to be processed of the prism to be processed.

[0181] Fig.26 yes Figure 1 The electronic device 1000 shown is a partial cross-sectional structural schematic diagram in another embodiment, cut along AA. Fig. 27 yes Fig.26 Shown is a schematic diagram of the structure of an optical folding element in some embodiments. Fig.28 yes Fig. 27 A schematic structural diagram of the optical folding element shown at another viewing angle.

[0182] like Figure 26 to Figure 28 As shown, the structure of the electronic device 1000 in this embodiment is similar to Figure 2 The structure of the electronic device 1000 shown is roughly the same, and the same parts will not be repeated. Some differences between the two are introduced below. The camera module 400 may include a first anti-shake component 70, a focusing component 80 and a second anti-shake component 90 arranged in sequence along the optical axis direction. The first anti-shake component 70 may include a first motor 70a and an optical folding element 70b. The optical folding element 70b can be installed on the first motor 70a. The first motor 70a can drive the optical folding element 70b to move to achieve optical image stabilization (OIS).

[0183] Exemplarily, the focus assembly 80 may include a focus motor 80a and a lens group 80b. The lens group 80b may be mounted on the focus motor 80a. The focus motor 80a may drive the lens group 80b to move along the optical axis to achieve autofocus (AF). The lens group 80b may include at least one lens.

[0184] Exemplarily, the second anti-shake component 90 may include a second motor 90a and an optical element 90b. The optical element 90b may be mounted on the second motor 90a. The second anti-shake component 90 may also include an image sensor (not shown). The image sensor may be located on the image side of the optical element 90b and mounted on the second motor 90a. The second motor 90a may achieve optical image stabilization by driving the image sensor to move. Among them, the optical folding element 70b, the lens group 80b and the optical element 90b may together constitute the optical system of the camera module. In other embodiments, the second motor 90a may also achieve optical image stabilization by driving the optical element 90b to move.

[0185] Exemplarily, the optical folding element 70b may be a prism. The optical folding element 70b may include a first surface 71, a second surface 72, and a third surface 73 connected end to end in sequence. The first surface 71 may be arranged perpendicular to the second surface 72. The angles formed by the third surface 73 and the first surface 71 and the second surface 72 may be less than 90°. In this embodiment, the angle formed between the third surface 73 and the first surface 71 may be 45°. The optical folding element 70b may also include a first side surface 74 and a second side surface 75 arranged opposite to each other. The first side surface 74 and the second side surface 75 may both connect the first surface 71, the second surface 72, and the third surface 73. The first side surface 74 and the second side surface 75 may both be arranged perpendicular to the first surface 71.

[0186] Exemplarily, the incident surface 76 of the optical folding element 70b may be formed on the first surface 71. The exit surface 77 may be formed on the second surface 72. That is, the incident surface 76 and the exit surface 77 may be perpendicular to each other. The optical folding element 70b may also include a reflective surface, for example, a first reflective surface. The first reflective surface may be formed on the third surface 73. In this way, after the light enters the interior of the optical folding element 70b from the incident surface 76, it may be reflected by the first reflective surface and emitted from the optical folding element 70b from the exit surface 77.

[0187] Exemplarily, the optical folding element 70b may further include a plurality of first grooves 78. The plurality of first grooves 78 may be distributed on the first side 74 and / or the second side 75. In the present embodiment, a portion of the plurality of first grooves 78 may be located on the first side 74, and another portion may be located on the second side 75. The plurality of first grooves 78 located on the first side 74 and the plurality of first grooves 78 located on the second side 75 may be symmetrical structures. Taking the plurality of first grooves 78 located on the first side 74 as an example, the projection area of ​​the plurality of first grooves 78 on the first side 74 may be equal to the area of ​​the first side 74. That is, the plurality of first grooves 78 located on the first side 74 may completely cover the first side 74. In other embodiments, the plurality of first grooves 78 may also only cover a portion of the first side 74.

[0188] For example, the first groove 78 may be in the shape of an elongated strip. The length extension direction of the first groove 78 may intersect with the normal direction of the incident surface 76. In this embodiment, the length extension direction of the first groove 78 may be perpendicular to the normal direction of the incident surface 76.

[0189] Exemplarily, the groove surface 78a of the first groove 78 may be a reflective surface, for example, by coating / pasting a reflective material on the groove surface 78a of the first groove 78 so that the groove surface 78a of the first groove 78 can reflect light. When light is transmitted to the groove surface 78a of the first groove 78, the light may be reflected by the groove surface 78a of the first groove 78.

[0190] Exemplarily, the optical folding element 70b may further include a fourth light absorbing layer (not shown). The fourth light absorbing layer may be fixedly connected to the groove surface 78a of the first groove 78 and cover at least a portion of the groove surface 78a of the first groove 78. For example, the fourth light absorbing layer may be formed by coating a light absorbing ink on the groove surface 78a of the first groove 78 or by providing a light absorbing film layer. In this way, when light is transmitted to the groove surface 78a of the first groove 78, at least part of the energy of the light may be absorbed by the fourth light absorbing layer, thereby reducing the intensity of the light.

[0191] Fig.29 It is a schematic diagram of the light propagation of local stray light in a general optical folding element 600. Fig.30 yes Fig. 27 A schematic diagram of the light propagation of stray light in a local area in the optical folding element 70b is shown.

[0192] like Fig.29 and Fig.30 As shown, when the user takes a photo, the stray light from the external environment (i.e., the second light in this embodiment) passes through the incident surface and is transmitted to the side of the prism. Fig.29In the above, the second light is transmitted to the first side surface 601 or the second side surface 602, and is reflected by the first side surface 601 or the second side surface 602 to the exit surface (not shown), and is emitted from the exit surface, and finally imaged on the image sensor. At this time, stray light will interfere with the image quality and affect the user's shooting experience.

[0193] The optical folding element 70b in this embodiment is a prism, and a plurality of first grooves 78 are provided on the first side surface 74 and / or the second side surface 75, and the length extension direction of the first grooves 78 intersects with the normal direction of the incident surface 76, so that stray light directed toward the first side surface 74 or the second side surface 75 can be reflected by the groove surface 78a of the first groove 78 in the direction toward the incident surface 76, and will not be transmitted to the exit surface, and finally imaged on the image sensor. That is, the optical folding element 70b in this embodiment can effectively reduce the influence of stray light on the imaging quality and improve the user's shooting experience.

[0194] Secondly, the length extension direction of the first groove 78 in this embodiment can be perpendicular to the normal direction of the incident surface 76. In this way, the first groove 78 can better eliminate stray light transmitted to the side of the optical folding element 70b, which is beneficial to improving the imaging quality.

[0195] In addition, the optical folding element 70b in this embodiment may further include a light absorbing layer. The light absorbing layer may be provided on the groove surface 78a of the first groove 78. In this way, after the stray light is directed toward the groove surface 78a of the first groove 78, at least part of the energy of the stray light can be absorbed by the light absorbing layer, which can effectively reduce the energy of the stray light and reduce the influence of the stray light on the imaging quality, which is beneficial to improving the user's shooting experience. At the same time, the length extension direction of the first groove 78 is perpendicular to the normal direction of the incident surface 76, so that the incident angle between the stray light transmitted to the first groove 78 and the groove surface 78a of the first groove 78 is small, so that most of the energy of the stray light can be absorbed by the light absorbing layer, thereby effectively eliminating the influence of the stray light on the imaging quality.

[0196] Exemplarily, the groove surface 78a of the first groove 78 may include a first groove surface 781 and a second groove surface 782 that are arranged opposite to each other. It should be understood that the shape, arrangement and other features of the first groove 78 of the optical folding element 70b in this embodiment can also refer to Figure 8 The first groove 391 of the optical folding element 30 shown is set and will not be described in detail here.

[0197] In some embodiments, the camera module 100 may not include the first motor 70 a. In this case, the optical folding element 70 b may be fixed to the light-incoming side of the focusing assembly 80 .

[0198] In some embodiments, the optical element 90b of the second anti-shake assembly 90 may also be a prism. The structure of the optical element 90b may be substantially the same as that of the optical folding element 70b. For example, the side of the optical element 90b may also be provided with a plurality of grooves to eliminate reflected stray light. Exemplarily, the length extension direction of the groove of the optical element 90b may also be perpendicular to the incident surface of the optical element 90b. At this time, the length extension direction of the groove of the optical element 90b may be perpendicular to the length extension direction of the first groove 78.

[0199] In other embodiments, the optical folding element 70 b of the first anti-shake assembly 70 may not include the first groove 78 . The side surface of the optical element 90 b of the second anti-shake assembly 90 may be provided with a plurality of grooves to eliminate stray light of the camera module 400 .

[0200] It should be noted that, in the absence of conflict, the features in the embodiments of the present application can be combined with each other, and any combination of features in different embodiments is also within the protection scope of the present application. That is to say, the multiple embodiments described above can also be arbitrarily combined according to actual needs.

[0201] It should be noted that all the above drawings are illustrative illustrations of the present application and do not represent the actual size of the product. Moreover, the size ratio relationship between the components in the drawings is not intended to limit the actual product of the present application.

[0202] The above are only some implementation methods of the present application, and the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by any person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An optical folding element (30), characterized in that: The optical folding element (30) comprises a first surface (31), a second surface (32), a first side surface (33) and a second side surface (34); the first surface (31) and the second surface (32) are arranged opposite to each other; the first side surface (33) and the second side surface (34) are arranged opposite to each other and are both connected between the first surface (31) and the second surface (32); the optical folding element (30) comprises an incident surface (30a) and an exit surface (30b); the incident surface (30a) is located on the first surface (31), and the exit surface (30b) is located on the first surface (31) or the second surface (32); The optical folding element (30) further comprises a plurality of first grooves (391), the plurality of first grooves (391) being distributed on the first side surface (33) and / or the second side surface (34), the length extension direction of the projection of the first grooves (391) on the first plane (M) being arranged at an angle to the normal direction (Z) of the incident surface (30a), the first plane (M) being perpendicular to a first direction (Y), and the first direction (Y) being the direction from the first side surface (33) to the second side surface (34); The first light enters the optical folding element (30) from the incident surface (30a), is reflected multiple times inside the optical folding element (30), and is then emitted from the exit surface (30b); the second light enters the optical folding element (30) from the incident surface (30a), and is reflected in a direction toward the incident surface (30a) under the action of the groove surface of the first groove (391).

2. The optical folding element (30) according to claim 1, characterized in that The angle (β1) formed between the length extension direction of the projection of the first groove (391) on the first plane (M) and the normal direction (Z) of the incident surface (30a) is less than or equal to 50°.

3. The optical folding element (30) according to claim 1, characterized in that The angle (β1) formed between the length extension direction of the projection of the first groove (391) on the first plane (M) and the normal direction (Z) of the incident surface (30a) is less than or equal to 15°.

4. The optical folding element (30) according to claim 1, characterized in that The optical folding element (30) further comprises a first reflecting surface (371), the first reflecting surface (371) being located between the first surface (31) and the second surface (32), and being located on the same side of the first side surface (33) and the second side surface (34), the first reflecting surface (371) being arranged closer to the incident surface (30a) than the exit surface (30b); The angle (β2) formed between the projection of the first groove (391) on the first plane (M) and the first surface (31) is greater than 90°, and the opening of the angle (β2) faces the first reflection surface (371).

5. The optical folding element (30) according to claim 1, characterized in that The refractive index of the optical folding element (30) is greater than or equal to 1.

7.

6. The optical folding element (30) according to claim 5, characterized in that The material of the optical folding element (30) is heavy lanthanum flint glass or heavy crown glass.

7. The optical folding element (30) according to any one of claims 1 to 6, characterized in that The first side surface (33) is arranged at an angle with the first surface (31), and the distance between the first side surface (33) and the second side surface (34) increases in a direction approaching the second surface (32).

8. The optical folding element (30) according to claim 7, characterized in that An included angle (α1) formed between the first side surface (33) and the first surface (31) is in the range of 100° to 130°.

9. The optical folding element (30) according to claim 4, characterized in that The included angle (α2) formed between the first reflecting surface (371) and the incident surface (30a) is in the range of 20° to 40°.

10. The optical folding element (30) according to any one of claims 1 to 6, characterized in that The optical folding element (30) further comprises a plurality of second grooves (392), and the openings of the plurality of second grooves (392) are all formed on the second surface (32).

11. The optical folding element (30) according to claim 10, characterized in that The length extension direction of the second groove (392) is arranged at an angle to the first direction (Y).

12. The optical folding element (30) according to claim 11, characterized in that The angle formed between the length extension direction of the second groove (392) and the first direction (Y) is less than or equal to 10°.

13. The optical folding element (30) according to claim 4, characterized in that The optical folding element (30) further comprises a second reflecting surface (372), wherein the second reflecting surface (372) is located between the first surface (31) and the second surface (32), and is located on a side of the first side surface (33) facing away from the first reflecting surface (371); The optical folding element (30) further comprises a light-blocking layer (38), wherein the light-blocking layer (38) is located between the first reflecting surface (371) and the second reflecting surface (372), the light-blocking layer (38) is fixedly connected to the second surface (32) and is spaced apart from the first surface (31), and a light-transmitting area (30c) is formed between the light-blocking layer (38) and the first surface (31).

14. The optical folding element (30) according to claim 13, characterized in that The optical folding element (30) further comprises a light-blocking groove (381), wherein an opening of the light-blocking groove (381) is formed on the second surface (32), a groove surface of the light-blocking groove (381) is capable of reflecting light, and the groove surface of the light-blocking groove (381) constitutes the light-blocking layer (38); The groove surface of the light-blocking groove (381) comprises a first groove side surface (3821) and a second groove side surface (3822) that are arranged opposite to each other, and a groove top surface (3823) connected between the first groove side surface (3821) and the second groove side surface (3822), and the groove top surface (3823) is in an arc shape; Alternatively, the groove top surface (3823) includes a first top surface (3831) and a second top surface (3832) that are arranged at an angle, and an angle (α3) between the first top surface (3831) and the second top surface (3832) is in the range of 20° to 120°.

15. The optical folding element (30) according to claim 14, characterized in that The optical folding element (30) further comprises a plurality of third grooves (393), and the openings of the plurality of third grooves (393) are all formed on the groove top surface (3823).

16. The optical folding element (30) according to any one of claims 1 to 6, characterized in that The groove surface (391a) of the first groove (391) comprises a first groove surface (3911) and a second groove surface (3912) which are arranged opposite to each other, and an angle (β3) formed between the first groove surface (3911) and the second groove surface (3912) is in the range of 30° to 110°.

17. The optical folding element (30) according to any one of claims 1 to 6, characterized in that The groove surface (391a) of the first groove (391) comprises a first groove surface (3911) and a second groove surface (3912) which are arranged opposite to each other, and the width of the first groove surface (3911) is greater than or equal to 10 micrometers; Alternatively, the width of the first groove surface (3911) is in the range of 10 microns to 100 microns.

18. The optical folding element (30) according to any one of claims 1 to 6, characterized in that The groove surface (391a) of the first groove (391) comprises a first groove surface (3911) and a second groove surface (3912) which are arranged opposite to each other, and the first groove surface (3911) is connected to the second groove surface (3912); Alternatively, a fillet is formed at the connection between the first groove surface (3911) and the second groove surface (3912), and the radius of the fillet is less than or equal to 10% of the height (H1) of the triangle where the first groove surface (3911) and the second groove surface (3912) are located; Alternatively, a fillet is formed at the connection between the first groove surface (3911) and the second groove surface (3912), and the radius of the fillet is less than or equal to 10 microns.

19. The optical folding element (30) according to any one of claims 1 to 6, characterized in that The groove surface (391a) of the first groove (391) comprises a first groove surface (3911) and a second groove surface (3912) which are arranged opposite to each other, the first groove surface (3911) and the second groove surface (3912) are both arc surfaces, and the center of curvature of the first groove surface (3911) and the center of curvature of the second groove surface (3912) are located on two opposite sides of the first groove (391).

20. The optical folding element (30) according to any one of claims 1 to 6, characterized in that The optical folding element (30) further comprises a first light absorbing layer, wherein the first light absorbing layer is fixed in the first groove (391) and covers at least a portion of the groove surface of the first groove (391).

21. An optical folding element, characterized in that: The optical folding element comprises a first surface, a second surface and a third surface connected end to end in sequence, wherein the first surface is perpendicular to the second surface, and the optical folding element has an incident surface and an exit surface, wherein the incident surface is located on the first surface, and the exit surface is located on the second surface; The optical folding element further includes a first side surface and a second side surface, wherein the first side surface and the second side surface are both connected to the first surface, the second surface and the third surface, and the first side surface and the second side surface are located on two sides opposite to the first surface; The optical folding element further comprises a plurality of first grooves, the plurality of first grooves are distributed on the first side surface and / or the second side surface, and the length extension direction of the first grooves intersects with the normal direction of the incident surface; Among them, the first light enters the optical folding element from the incident surface, is reflected inside the optical folding element, and is emitted from the exit surface; the second light enters the optical folding element from the incident surface, and is reflected in the direction toward the incident surface under the action of the groove surface of the first groove.

22. The optical folding element according to claim 21, characterized in that The length extension direction of the first groove is perpendicular to the normal direction of the incident surface.

23. The optical folding element according to claim 21, characterized in that The refractive index of the optical folding element is greater than or equal to 1.

7.

24. The optical folding element according to claim 21, characterized in that The material of the optical folding element is heavy lanthanum flint glass or heavy crown glass.

25. The optical folding element according to any one of claims 21 to 24, characterized in that The groove surface of the first groove includes a first groove surface and a second groove surface that are arranged opposite to each other, and the angle formed between the first groove surface and the second groove surface is in the range of 30° to 110°.

26. The optical folding element according to any one of claims 21 to 24, characterized in that The groove surface of the first groove includes a first groove surface and a second groove surface arranged opposite to each other, and the width of the first groove surface is greater than or equal to 10 microns; Alternatively, the width of the first groove surface is in the range of 10 micrometers to 100 micrometers.

27. The optical folding element according to any one of claims 21 to 24, characterized in that The groove surface of the first groove includes a first groove surface and a second groove surface that are arranged opposite to each other, the first groove surface and the second groove surface are both arc surfaces, and the curvature centers of the first groove surface and the curvature centers of the second groove surface are located on opposite sides of the first groove.

28. A camera module (100), characterized in that: The optical folding element comprises an image sensor (50) and the optical folding element according to any one of claims 1 to 27, wherein the image sensor (50) is located on the image side of the optical folding element.

29. An electronic device (1000), characterized in that: It comprises a device housing (200) and the camera module (100) according to claim 28, wherein the camera module (100) is arranged in the device housing (200).

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