Light path turning element, camera module and electronic device

Abstract

The utility model provides a kind of optical path turning element, it is equipped with incident plane, emergent surface, at least one first reflecting surface and at least one second reflecting surface, optical path turning element is equipped with multiple microstructures, multiple microstructures are set to at least one second reflecting surface and / or at least one first reflecting surface, microstructure is arc or broken line shape extension;Wherein, effective light enters optical path turning element by incident plane, after being reflected by at least one first reflecting surface, it is shot to the outside of optical path turning element by emergent surface;After stray light enters optical path turning element by incident plane, at least part stray light is reflected under the action of microstructure along the direction of incident plane, to make at least part stray light be shot to the outside of optical path turning element by incident plane.The optical path turning element can effectively eliminate stray light, improve imaging quality, and be conducive to reducing the volume of optical path turning element.The utility model further provides a kind of camera module and electronic equipment.

Description

Technical Field

[0001] This utility model relates to the field of optical element technology, and in particular to an optical path conversion element, a camera module, and an electronic device. Background Technology

[0002] To achieve a long focal length in a camera module, an optical path deflection element (such as a prism) is typically incorporated into the camera module. When external light enters the optical path deflection element, it undergoes at least one reflection on the reflective surface of the element before exiting and being imaged onto the image sensor. This increases the optical path length to meet the long focal length requirements of the camera module.

[0003] However, during camera module use, in addition to the effective light from the outside world being reflected onto the image sensor through the optical path deflection element, some stray light from the outside world is also reflected onto the image sensor, generating severe stray light interference and affecting image quality. To eliminate stray light, the current conventional solution is to increase the size of the optical path deflection element and roughen part of its reflective surface. This causes stray light to undergo diffuse reflection on this part of the reflective surface, thus reducing the concentration of stray light energy and consequently decreasing the intensity of stray light reflected onto the image sensor. However, this method is not very effective at eliminating stray light. Utility Model Content

[0004] The purpose of this invention is to provide an optical path reversal element that can effectively eliminate stray light, improve imaging quality, reduce the size of the optical path reversal element, and is simple to manufacture and has a low cost.

[0005] This utility model provides an optical path reversing element, which has an incident surface, an exit surface, at least one first reflecting surface, and at least one second reflecting surface. The optical path reversing element has a plurality of microstructures, which are arranged corresponding to at least one second reflecting surface and / or at least one first reflecting surface. The microstructures extend in an arc shape or a zigzag shape.

[0006] The effective light enters the optical path reversing element through the incident surface, and after being reflected by at least one of the first reflecting surfaces, it exits through the exit surface to the outside of the optical path reversing element. Stray light enters the optical path reversing element through the incident surface, and at least a portion of the stray light is reflected in the direction toward the incident surface under the action of the microstructure, so that at least a portion of the stray light exits through the incident surface to the outside of the optical path reversing element.

[0007] In one possible implementation, the microstructure includes a plurality of first microstructures, the plurality of first microstructures being disposed corresponding to at least a portion of the second reflective surface.

[0008] In one possible implementation, the second reflective surface includes a front side and a rear side of the optical path deflection element, with a plurality of the first microstructures disposed corresponding to at least a portion of the front side and / or at least a portion of the rear side.

[0009] In one possible implementation, the first reflective surface includes a top surface and a bottom surface of the optical path deflection element, the incident surface is disposed on the top surface, and the exiting surface is disposed on either the top surface or the bottom surface;

[0010] The first microstructure is directly connected to the top surface on the side closest to the incident surface; or, a connecting surface is provided between the second reflective surface and the top surface, the connecting surface being an inclined surface or an arc surface, and the first microstructure is connected to the connecting surface on the side closest to the incident surface.

[0011] In one possible implementation, the top surface includes an effective region and an ineffective region, and a light-absorbing layer is provided on the ineffective region of the top surface. The minimum distance between the first microstructure and the effective region of the top surface is 0.25 mm to 3 mm.

[0012] In one possible implementation, the second reflective surface includes a microstructure region, with a plurality of first microstructures disposed corresponding to the microstructure region; the optical path deflection element has a first direction perpendicular to the incident surface, along the first direction, the microstructure region is close to the incident surface, and the height of the microstructure region is greater than or equal to 1 / 5 of the total height of the second reflective surface.

[0013] In one possible implementation, the first microstructure extends in a continuous arc shape, and a plurality of the first microstructures are arranged continuously along the length direction of the optical path deflection element.

[0014] Alternatively, the first microstructure extends in a zigzag shape, and multiple first microstructures are continuously arranged along the length direction of the optical path deflection element;

[0015] Alternatively, the first microstructure extends in an arc shape, and multiple first microstructures are arranged in a fish-scale pattern along the length and / or thickness direction of the optical path deflection element.

[0016] In one possible implementation, the plurality of first microstructures include a plurality of first sub-microstructures and a plurality of second sub-microstructures, the plurality of second sub-microstructures and the plurality of first sub-microstructures being arranged adjacent to each other, the plurality of first sub-microstructures being arranged close to the incident surface, and the plurality of second sub-microstructures being located on the side of the plurality of first sub-microstructures away from the incident surface.

[0017] In one possible implementation, the second reflective surface includes a microstructure region, which includes a first microstructure region and a second microstructure region. A plurality of first sub-microstructures are disposed corresponding to the first microstructure region, and a plurality of second sub-microstructures are disposed corresponding to the second microstructure region. The first microstructure region and the second microstructure region are arranged adjacent to each other along a first direction or a second direction. The first direction is perpendicular to the incident surface, and the second direction is parallel to both the incident surface and the second reflective surface.

[0018] In one possible implementation, a plurality of first sub-microstructures and a plurality of second sub-microstructures extend in an arc shape; the extension direction of the first sub-microstructure is different from the extension direction of the second sub-microstructure, and / or the radius of curvature of the arc where the first sub-microstructure is located is different from the radius of curvature of the arc where the second sub-microstructure is located.

[0019] Alternatively, multiple first sub-microstructures and multiple second sub-microstructures may extend in a zigzag shape, with the extension direction of the first sub-microstructure being different from that of the second sub-microstructure;

[0020] Alternatively, multiple first sub-microstructures may extend in an arc shape, and multiple second sub-microstructures may extend in a zigzag shape.

[0021] Alternatively, multiple first sub-microstructures may extend in a zigzag shape, and multiple second sub-microstructures may extend in an arc shape.

[0022] In one possible implementation, each of the first reflective surfaces includes an invalid region; the microstructure includes a plurality of second microstructures, the plurality of second microstructures being configured to correspond to an invalid region of at least one of the first reflective surfaces.

[0023] In one possible implementation, the first reflective surface includes a top surface, a bottom surface, a left side surface, and a right side surface of the optical path deflection element, and a plurality of second microstructures are provided corresponding to the invalid regions of at least one of the top surface, the bottom surface, the left side surface, and the right side surface.

[0024] In one possible implementation, each of the first reflective surfaces includes an invalid region, and at least one of the invalid regions of the first reflective surface is provided with a light-absorbing layer.

[0025] In one possible implementation, the first reflective surface includes a bottom surface, a left side surface, and a right side surface of the optical path deflection element; an extinction groove is provided on the bottom surface, the extinction groove is located between the left side surface and the right side surface, and the extinction groove penetrates the bottom surface and the second reflective surface; at least a portion of the groove wall of the extinction groove is provided with a plurality of third microstructures.

[0026] In one possible implementation, at least a portion of the microstructure extends in an arc shape, and the angle between the opening direction of the arc of the arc-shaped microstructure and the first direction is 10° to 80°; wherein the first direction is perpendicular to the incident surface.

[0027] In one feasible manner, at least a portion of the microstructure extends in an arc shape, and the radius of the arc of the arc containing the microstructure is 0.1 mm to 20 mm.

[0028] In one feasible embodiment, at least a portion of the microstructure is a V-shaped reflective groove, the groove surface of which includes opposing first and second side groove surfaces; the included angle between the first and second side groove surfaces is 15° to 80°, and / or the width of the groove opening is 0.05 mm to 0.7 mm.

[0029] In one possible implementation, the microstructure is disposed on at least one of the second reflective surfaces and / or at least one of the first reflective surfaces.

[0030] In one feasible approach, a light-absorbing layer is provided on the surface of the microstructure.

[0031] In one feasible approach, the surface of the microstructure is sandblasted.

[0032] In one possible implementation, the microstructure is disposed inside the optical path deflection element and is located close to at least one second reflective surface and / or at least one first reflective surface.

[0033] In one feasible approach, the microstructure is formed inside the optical path deflection element by laser engraving.

[0034] In one feasible approach, at least one of the second reflective surfaces and / or at least one of the first reflective surfaces are provided with a light-absorbing layer at a position corresponding to the microstructure.

[0035] This utility model also provides a camera module, including a lens, an image sensor, and a light path deflection element as described above, wherein the lens is arranged corresponding to the incident surface of the light path deflection element, and the image sensor is arranged corresponding to the exit surface of the light path deflection element.

[0036] This utility model also provides an electronic device, including the camera module described above.

[0037] The optical path reversing element provided by this invention features multiple microstructures, each corresponding to at least one second reflecting surface and / or at least one first reflecting surface. When stray light enters the optical path reversing element from the incident surface, at least a portion of the stray light is reflected along the direction towards the incident surface by the microstructures, allowing at least a portion of the stray light to exit through the incident surface and beyond the optical path reversing element. This reduces stray light interference and improves image quality by reducing stray light interference from the second and / or first reflecting surfaces. Furthermore, the microstructures extend in an arc or zigzag shape, allowing for better diffuse reflection of stray light by adjusting the extension direction and the radius of curvature of the arc (when the microstructure extends in an arc) according to the actual reflection of stray light, thus providing greater design freedom. Meanwhile, the microstructure can be formed on the optical path conversion element by etching, molding, imprinting, engraving and other methods. Compared with the conventional approach of increasing the volume of the optical path conversion element and making the stray light reflecting surface of the optical path conversion element rough, this application is beneficial to reducing the volume of the optical path conversion element. Moreover, the microstructure is simple to process, easy to implement and has a low cost. Attached Figure Description

[0038] Figure 1 This is a three-dimensional structural diagram of the optical path deflection element in an embodiment of this utility model.

[0039] Figure 2 for Figure 1 A schematic diagram of the three-dimensional structure from another direction.

[0040] Figure 3 for Figure 1 A schematic diagram of the three-dimensional structure from another direction.

[0041] Figure 4 This is a schematic diagram of the optical path of the effective light rays when passing through the optical path turning element in the embodiment of this utility model.

[0042] Figure 5 This is a front view of the optical path deflection element in an embodiment of this utility model.

[0043] Figure 6 for Figure 5 A magnified view of a portion of location A in the diagram.

[0044] Figure 7 This is a top view of the optical path deflection element in an embodiment of this utility model.

[0045] Figure 8 for Figure 7 A magnified view of a portion of the area at position B.

[0046] Figure 9 This is a partially enlarged top view of the optical path deflection element in another embodiment of the present invention.

[0047] Figure 10 This is a three-dimensional structural diagram of the optical path deflection element in another embodiment of the present invention.

[0048] Figure 11 for Figure 10 Top view.

[0049] Figure 12 for Figure 11 A magnified view of a portion of the area at position C.

[0050] Figure 13 This is a partially enlarged top view of the optical path deflection element in another embodiment of the present invention.

[0051] Figure 14 This is a three-dimensional structural diagram of the optical path deflection element in another embodiment of the present invention.

[0052] Figure 15 This is a bottom view of the optical path deflection element in another embodiment of the present invention.

[0053] Figure 16 This is a bottom view of the optical path deflection element in another embodiment of the present invention.

[0054] Figure 17 This is a front view of the optical path deflection element in another embodiment of the present invention.

[0055] Figure 18 This is a front view of the optical path deflection element in another embodiment of the present invention.

[0056] Figure 19 This is a front view of the optical path deflection element in another embodiment of the present invention.

[0057] Figure 20 This is a front view of the optical path deflection element in another embodiment of the present invention.

[0058] Figure 21 This is a front view of the optical path deflection element in another embodiment of the present invention.

[0059] Figure 22 This is a front view of the optical path deflection element in another embodiment of the present invention.

[0060] Figure 23 This is a front view of the optical path deflection element in another embodiment of the present invention.

[0061] Figure 24 This is a front view of the optical path deflection element in another embodiment of the present invention.

[0062] Figure 25 This is a front view of the optical path deflection element in another embodiment of the present invention.

[0063] Figure 26 This is a front view of the optical path deflection element in another embodiment of the present invention.

[0064] Figure 27 This is a schematic diagram of the camera module in an embodiment of the present invention.

[0065] Figure 28 This is a schematic diagram of the camera module in another embodiment of the present invention.

[0066] Figure 29 This is the illuminance diagram for Example 1.

[0067] Figure 30 This is a comparative illuminance diagram. Detailed Implementation

[0068] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0069] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and claims of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0070] The directional terms such as "up," "down," "left," "right," "front," "back," "top," and "bottom" (if present) used in the specification and claims of this utility model are defined according to the position of the structures in the drawings and the relative positions of the structures, and are only for the purpose of clarity and convenience in expressing the technical solution. It should be understood that the use of directional terms should not limit the scope of protection claimed in this application.

[0071] like Figures 1 to 8 and Figure 27 As shown, this embodiment of the present invention provides a camera module, including a lens 4, an image sensor 5, and an optical path reversing element 1. The lens 4 and the image sensor 5 are located on one side of the optical path reversing element 1; wherein, the lens 4 and the image sensor 5 can be located on the same side of the optical path reversing element 1, or they can be located on different sides of the optical path reversing element 1. The optical path reversing element 1 includes an incident surface 1A, an exit surface 1B, at least one first reflecting surface 1C, and at least one second reflecting surface 1D (the incident surface 1A and the exit surface 1B are shown as dashed lines in the figure); the lens 4 is disposed corresponding to the incident surface 1A of the optical path reversing element 1, and the image sensor 5 is disposed corresponding to the exit surface 1B of the optical path reversing element 1.

[0072] The optical path deflection element 1 is provided with a plurality of microstructures 2, which are arranged corresponding to at least one second reflecting surface 1D and / or at least one first reflecting surface 1C. The microstructures 2 have a diffuse reflection effect on light. The plurality of microstructures 2 may be arranged corresponding to a part of the at least one second reflecting surface 1D and / or a part of the at least one first reflecting surface 1C, or the plurality of microstructures 2 may be arranged corresponding to the entire area of ​​at least one second reflecting surface 1D and / or the entire area of ​​at least one first reflecting surface 1C.

[0073] The meaning of multiple microstructures 2 corresponding to at least one second reflective surface 1D and / or at least one first reflective surface 1C is as follows: Figure 1 and Figure 7 As shown, when the microstructure 2 is disposed on the surface of the optical path deflection element 1, the microstructure 2 is disposed on at least one second reflecting surface 1D and / or at least one first reflecting surface 1C; as Figure 10 and Figure 11 As shown, when the microstructure 2 is disposed inside the optical path deflection element 1, the disposed position of the microstructure 2 corresponds to the position of at least one second reflective surface 1D and / or at least one first reflective surface 1C, and the microstructure 2 is disposed close to at least one second reflective surface 1D and / or at least one first reflective surface 1C.

[0074] The working principle of the optical path reversing element 1 is as follows: When external light enters the optical path reversing element 1 through the lens 4, the light is divided into effective light and stray light. The effective light is the light that propagates within the optical path reversing element 1 according to the designed optical path, and it has a positive effect on imaging. The stray light is the light that does not propagate within the optical path reversing element 1 according to the designed optical path, and it will interfere with the final imaging effect. The effective light enters the optical path reversing element 1 through the incident surface 1A, and after being reflected by at least one first reflecting surface 1C, it exits through the exit surface 1B to the outside of the optical path reversing element 1, and finally reaches the image sensor 5 for imaging. After the stray light enters the optical path reversing element 1 through the incident surface 1A, at least a portion of the stray light is reflected in the direction toward the incident surface 1A under the action of the microstructure 2, so that at least a portion of the stray light exits through the incident surface 1A to the outside of the optical path reversing element 1, thereby reducing the amount of stray light emitted onto the image sensor 5 and improving the imaging quality.

[0075] Specifically, such as Figures 1 to 8 and Figure 27As shown, in this embodiment, the optical path deflection element 1 is a wedge-shaped structure, having two mutually perpendicular length directions L, width directions W, and thickness directions T (i.e., height directions). The surface of the optical path deflection element 1 includes a top surface 11, a bottom surface 12, a front side surface 13, a rear side surface 14, a left side surface 15, and a right side surface 16. The top surface 11 and the bottom surface 12 are arranged opposite each other along the thickness direction T and are parallel to each other. The front side surface 13 and the rear side surface 14 are arranged opposite each other along the width direction W and are parallel to each other; however, in other embodiments, the front side surface 13 and the rear side surface 14 may not be parallel, i.e., the plane containing the front side surface 13 intersects the plane containing the rear side surface 14. The left side surface 15 and the right side surface 16 are arranged opposite each other along the length direction L, and may or may not be parallel. In this embodiment, both the left side surface 15 and the right side surface 16 are inclined relative to the top surface 11.

[0076] In this embodiment, both the incident surface 1A and the exiting surface 1B are disposed on the top surface 11; in other embodiments, for example, when the left side surface 15 and the right side surface 16 are arranged parallel to each other, the exiting surface 1B can also be disposed on the bottom surface 12. When both the incident surface 1A and the exiting surface 1B are disposed on the top surface 11, the incident surface 1A and the exiting surface 1B are spaced apart along the length direction L; at the same time, along the thickness direction T, the incident surface 1A corresponds to the left side surface 15, and the exiting surface 1B corresponds to the right side surface 16. The top surface 11 also includes a first intermediate reflecting surface 110, which is located between the incident surface 1A and the exiting surface 1B along the length direction L. The first reflecting surface 1C includes the top surface 11, the bottom surface 12, the left side surface 15, and the right side surface 16, and the second reflecting surface 1D includes the front side surface 13 and the rear side surface 14. Of course, in other embodiments, the optical path deflection element 1 can also be of other shapes and structures, in which case the positions of the incident surface 1A, the exit surface 1B, the first reflecting surface 1C and the second reflecting surface 1D may change accordingly.

[0077] like Figure 27 As shown, in one embodiment, according to the designed optical path, the effective light needs to undergo three reflections within the optical path reversing element 1. Specifically, when external light enters the optical path reversing element 1 through the lens 4, the effective light enters the optical path reversing element 1 from the incident surface 1A, and after being reflected sequentially by the left side surface 15, the first intermediate reflecting surface 110, and the right side surface 16, it exits through the exit surface 1B and finally reaches the image sensor 5 for imaging. Therefore, in this embodiment, when some light does not undergo three reflections according to the designed optical path, this part of the light is considered stray light.

[0078] like Figure 28As shown, in another embodiment, the length, and / or thickness, and / or tilt angle of the left side 15 / right side 16 of the optical path deflection element 1 are related to... Figure 27 The optical path deflection element 1 in the illustrated embodiment is different; at the same time, the top surface 11 also includes a first reflective surface 111 and a second reflective surface 112. Along the length direction L, the first reflective surface 111 and the second reflective surface 112 are both located between the incident surface 1A and the exit surface 1B, and the first reflective surface 111 is set close to the incident surface 1A, and the second reflective surface 112 is set close to the exit surface 1B; the bottom surface 12 includes a second intermediate reflective surface 120. Along the length direction L, the second intermediate reflective surface 120 is located at the middle position of the bottom surface 12. In this embodiment, according to the designed optical path, the effective light needs to undergo five reflections within the optical path reversing element 1. Specifically, when external light enters the optical path reversing element 1 through the lens 4, the effective light enters the optical path reversing element 1 from the incident surface 1A, and after being reflected sequentially by the left side surface 15, the first reflecting surface 111, the second intermediate reflecting surface 120, the second reflecting surface 112, and the right side surface 16, it exits through the exit surface 1B and finally reaches the image sensor 5 for imaging. Therefore, in this embodiment, when some light does not undergo five reflections according to the designed optical path, this part of the light is considered stray light.

[0079] like Figures 1 to 7 and Figure 27 As shown, in this embodiment, each first reflecting surface 1C includes an invalid region 10B, and at least a portion of the first reflecting surface 1C includes an effective region 10A. The effective region 10A can be used to set the incident surface 1A / exit surface 1B, and / or to set a reflecting surface that reflects effective light. The invalid region 10B is any part of the first reflecting surface 1C other than the effective region 10A; the invalid region 10B neither participates in the reflection of effective light nor has an incident surface 1A / exit surface 1B set therein. In this embodiment, the top surface 11, left side surface 15, and right side surface 16 of the optical path deflection element 1 each include an effective region 10A and an invalid region 10B, respectively. Since the bottom surface 12 neither participates in the reflection of effective light nor has an incident surface 1A / exit surface 1B set therein, the bottom surface 12 only includes the invalid region 10B.

[0080] like Figure 28 As shown, in another embodiment, each first reflective surface 1C includes an effective region 10A and an ineffective region 10B. Specifically, along the length direction L, the ineffective region 10B of the top surface 11 is located between reflective surface 111 and reflective surface 112, and the ineffective region 10B of the bottom surface 12 is located on opposite sides of the second intermediate reflective surface 120.

[0081] like Figures 1 to 6As shown, in this embodiment, each microstructure 2 is a strip structure, and each microstructure 2 extends in an arc or zigzag shape. Specifically, the microstructure 2 can be a groove structure extending in an arc or zigzag shape, etc. By setting multiple microstructures 2 on the optical path reversing element 1, when stray light enters the optical path reversing element 1 from the incident surface 1A, at least a portion of the stray light is reflected in the direction towards the incident surface 1A under the reflection of the microstructure 2, so that at least a portion of the stray light exits through the incident surface 1A to the outside of the optical path reversing element 1, thereby reducing stray light interference and improving imaging quality by reducing stray light interference. Simultaneously, the arc or zigzag extension of the microstructure 2 allows for better diffuse reflection of stray light by adjusting the extension direction of the microstructure 2 and the radius of curvature of the arc where the microstructure 2 is located (when the microstructure 2 extends in an arc shape), according to the actual reflection of the stray light, thus creating a higher degree of design freedom. Meanwhile, the microstructure 2 can be formed on the optical path conversion element 1 by etching, molding, imprinting, engraving, etc. Compared with the conventional approach of increasing the volume of the optical path conversion element and making the stray light reflecting surface of the optical path conversion element rough, this application is beneficial to reducing the volume of the optical path conversion element 1. Moreover, the microstructure 2 is simple to process, easy to implement, and has a low cost.

[0082] like Figures 1 to 7 As shown, in this embodiment, multiple microstructures 2 are disposed corresponding to at least one second reflective surface 1D, and the microstructures 2 extend in an arc shape. Figure 15 As shown, in other embodiments, multiple microstructures 2 may simultaneously correspond to at least one second reflecting surface 1D and at least one first reflecting surface 1C; or, in other embodiments, multiple microstructures 2 may only correspond to at least one second reflecting surface 1D; or, in other embodiments, multiple microstructures 2 may only correspond to at least one first reflecting surface 1C. Figure 20 As shown, in other embodiments, the microstructure 2 may also extend in a zigzag shape.

[0083] like Figure 5 As shown, in one embodiment, when at least a portion of the microstructure 2 extends in an arc shape, the arc of the arc-extending microstructure 2 can be a single arc, that is, the arc of the arc-extending microstructure 2 is composed of an arc segment. For example... Figure 18As shown, in another embodiment, when at least a portion of the microstructure 2 extends in an arc shape, the arc of the arc-shaped microstructure 2 can also be a wavy structure, that is, the arc of the arc-shaped microstructure 2 is formed by connecting multiple arc segments (not labeled in the figure) in sequence, and the extension directions of adjacent arc segments are different. In another embodiment, when at least a portion of the microstructure 2 extends in an arc shape, the tangent at at least some positions on the arc of the arc-shaped microstructure 2 is parallel to the first direction S1, that is, the tangent at at least one point on the arc of the arc of the arc-shaped microstructure 2 is parallel to the first direction S1; wherein, the first direction S1 is perpendicular to the incident surface 1A, and in this embodiment, the first direction S1 is parallel to the thickness direction T.

[0084] like Figure 20 As shown, in another embodiment, when at least a portion of the microstructure 2 extends in a zigzag shape, the zigzag line containing the microstructure 2 includes at least one zigzag unit 23. Each zigzag unit 23 includes a first line segment 231 and a second line segment 232. The first line segment 231 and the second line segment 232 are connected by a bend at a certain angle. The angle between the first line segment 231 and the second line segment 232 is greater than 0° and less than 180°. Specifically, in this embodiment, the angle between the first line segment 231 and the second line segment 232 is greater than 90° and less than 180°. The first line segment 231 extends along a first sub-direction (not labeled in the figure), and the second line segment 232 extends along a second sub-direction (not labeled in the figure). The first sub-direction and the second sub-direction are not parallel (i.e., they intersect). In this embodiment, the first sub-direction is parallel to the first direction S1, that is, the first line segment 231 extends along the first direction S1, and the second sub-direction intersects with the first direction S1. In this embodiment, the zigzag line of the microstructure 2, which extends at least partially in a zigzag shape, includes a plurality of sequentially connected zigzag units 23. That is, the zigzag line of the microstructure 2, which extends at least partially in a zigzag shape, is formed by a plurality of first line segments 231 and a plurality of second line segments 232 connected alternately in sequence.

[0085] Furthermore, such as Figures 1 to 6 As shown, in this embodiment, the microstructure 2 is disposed on at least one second reflective surface 1D, that is, the microstructure 2 is disposed on the surface of the light path deflection element 1. In other embodiments, the microstructure 2 can also be disposed on at least one first reflective surface 1C. The material of the light path deflection element 1 can be glass, crystal, resin, etc. The microstructure 2 can be formed on the surface of the light path deflection element 1 by turning, etching (e.g., laser etching), molding (e.g., injection molding, compression molding, etc.), embossing, engraving (e.g., surface engraving), etc. In this case, the microstructure 2 can be a groove structure, and stray light can be reflected on the groove surface.

[0086] like Figures 10 to 12As shown, in another embodiment, the microstructure 2 is disposed inside the optical path deflection element 1 and is located close to at least one second reflecting surface 1D and / or at least one first reflecting surface 1C. The microstructure 2 can be formed inside the optical path deflection element 1 by laser engraving. Specifically, laser engraving involves injecting a laser into a transparent material (such as glass, crystal, etc.). When the intensity of the laser focal point exceeds the destruction threshold of the transparent material, the high-intensity laser causes a transient change in the molecular structure of the material at the focal point, resulting in micro-explosions and forming tiny burst points. These burst points are arranged in a pattern to form the engraving effect. That is, in this embodiment, the microstructure 2 is composed of multiple tiny burst points formed inside the optical path deflection element 1 by laser engraving and extending in an arc or zigzag shape. The minimum distance L3 between the microstructure 2 and the corresponding second reflecting surface 1D or first reflecting surface 1C is 0.25mm to 3mm, that is, the minimum distance between the microstructure 2 and the corresponding surface of the optical path deflection element 1 is 0.25mm to 3mm.

[0087] Furthermore, such as Figure 7 and Figure 8 As shown, in this embodiment, at least a portion of the microstructure 2 is a V-shaped reflective groove 20. The reflective groove 20 is formed by an inward indentation from the surface of the light path deflection element 1, and the reflective groove 20 extends in an arc shape. The groove surface of the reflective groove 20 includes a first side groove surface 201 and a second side groove surface 202 facing each other. The plane containing the first side groove surface 201 intersects the plane containing the second side groove surface 202. The first side groove surface 201 and / or the second side groove surface 202 can reflect stray light. The included angle α between the first side groove surface 201 and the second side groove surface 202 is 15° to 80°, or 15° to 40°, or 20° to 40°, or 40° to 80°, or 40° to 60°, etc. The width L2 of the groove opening 203 of the reflective groove 20 is 0.05mm to 0.7mm, or 0.1mm to 0.7mm, or 0.2mm to 0.7mm, etc. Within this range, the microstructure 2 can better diffusely reflect stray light, improving the effect of eliminating stray light. The bottom 204 and opening 203 of the reflective groove 20 can be sharp-angled or non-sharp-angled (e.g., arc-shaped). Of course, in other embodiments, the cross-section of the reflective groove 20 can also be other shapes; for example, the cross-section of the reflective groove 20 can be an arc-shaped structure. Specifically, the cross-section of the reflective groove 20 can be a circular arc surface structure.

[0088] It is worth mentioning that some optical path deflection elements currently eliminate stray light by setting reflective grooves on part of their reflective surfaces. The cross-section of the reflective groove is V-shaped and extends in a straight line. However, due to limitations in manufacturing process precision, it is difficult to make the bottom and opening of this V-shaped reflective groove completely sharp during actual processing. This results in various angled slopes on the surface of the V-shaped reflective groove, leading to poor or unstable stray light elimination. In this embodiment, by setting the microstructure 2 to extend in an arc or zigzag shape, even if the actual shape of the sharp corner on the V-shaped reflective groove does not match the design shape, the microstructure 2 can still achieve a good diffuse reflection effect on stray light by adjusting the extension direction of the microstructure 2 and the radius of curvature of the arc where the microstructure 2 is located (when the microstructure 2 extends in an arc) according to the actual reflection of stray light. This compensates for the defects caused by insufficient manufacturing process precision.

[0089] Furthermore, such as Figure 5 and Figure 6 As shown, in this embodiment, at least a portion of the microstructure 2 extends in an arc shape, and the angle b between the opening direction X of the arc of the microstructure 2 and the first direction S1 is 0° to 90°. When the angle b is 0°, the opening direction X is parallel to the first direction S1, and the arc of the microstructure 2 can open upwards or downwards (see reference). Figure 22 When the included angle b is 90°, the opening direction X is perpendicular to the first direction S1. At this time, the arc containing microstructure 2 can open to the left or to the right (see reference). Figure 19 Preferably, the angle b between the opening direction X of the arc of the microstructure 2 and the first direction S1 of the incident surface 1A is 10° to 80°, so that the microstructure 2 can better diffusely reflect stray light and improve the effect of eliminating stray light. The first direction S1 of the incident surface 1A is perpendicular to the incident surface 1A; the opening direction X of the arc of the microstructure 2 is also the bending direction of the arc of the microstructure 2, specifically the direction of the perpendicular bisector of the line connecting the two endpoints of the arc of the microstructure 2. This opening direction X can characterize the orientation of the arc of the microstructure 2. In particular, when the microstructure 2 extends in a circular arc shape, this opening direction X is the direction (i.e., the radius direction) of the circular arc of the microstructure 2 pointing towards the center of the circle.

[0090] Furthermore, such as Figure 5 and Figure 6 As shown, in this embodiment, at least a portion of the microstructure 2 extends in an arc shape. The radius R (not shown in the figure) of the arc line containing the arc-shaped microstructure 2 is 0.1mm to 20mm, or 1mm to 20mm, or 5mm.

[0091] ~15mm, etc. Within this range, the microstructure 2 can better diffusely reflect stray light, thereby improving the effect of eliminating stray light.

[0092] Figure 9 This is a partially enlarged top view of the optical path deflection element in another embodiment of the present invention. Figure 9 Compared to Figure 8 Specifically, a light-absorbing layer 3 is additionally provided on the surface of the optical path deflection element 1. For example... Figure 9 As shown, in another embodiment, a light-absorbing layer 3 is further provided on the surface of the optical path deflection element 1. The light-absorbing layer 3 is provided at least corresponding to the microstructure 2, and specifically, the light-absorbing layer 3 can be a light-absorbing ink capable of absorbing light. By providing the light-absorbing layer 3, when some stray light is not reflected by the microstructure 2, this stray light can be absorbed by the light-absorbing layer 3. Moreover, the light-absorbing layer 3 can prevent external light from entering the optical path deflection element 1 through surfaces other than the incident surface 1A, thereby further achieving the effect of eliminating stray light. Figure 9 As shown and combined Figures 1 to 7 When the microstructure 2 is disposed on at least one second reflecting surface 1D and / or at least one first reflecting surface 1C, that is, when the microstructure 2 is disposed on the surface of the optical path deflection element 1, the light-absorbing layer 3 is disposed on the surface of the microstructure 2 (for example, when the microstructure 2 is a reflective groove 20, the light-absorbing layer 3 can be disposed on the groove surface of the reflective groove 20). Simultaneously, when the microstructure 2 is disposed on at least one second reflecting surface 1D and / or at least one first reflecting surface 1C, the surface of the microstructure 2 can also be sandblasted to improve the surface roughness of the microstructure 2, thereby further improving the reflection effect of the microstructure 2 on stray light, and thus improving the effect of eliminating stray light. After sandblasting, the surface roughness of the microstructure 2 can be 0.5 micrometers to 5 micrometers, or 1 micrometer to 5 micrometers, or 2 micrometers to 4 micrometers, etc. It should be noted that when the surface of the microstructure 2 needs to be sandblasted and the light-absorbing layer 3 is disposed simultaneously, the surface of the microstructure 2 is sandblasted first, and then the light-absorbing layer 3 is disposed on the surface of the microstructure 2.

[0093] It should be noted that, in addition to being disposed on the surface of the microstructure 2, the light-absorbing layer 3 can also be disposed on at least one area of ​​the second reflective surface 1D where the microstructure 2 is not disposed, meaning that the entire surface of at least one second reflective surface 1D is provided with the light-absorbing layer 3; simultaneously, the light-absorbing layer 3 can also be disposed on the ineffective area 10B of at least one first reflective surface 1C, for example, please refer to... Figure 28 The light-absorbing layer 3 can also be provided on the invalid region 10B of the top surface 11 and the invalid region 10B of the bottom surface 12. The light-absorbing layer 3 can be provided at other positions on the surface of the light path deflection element 1, except that it cannot be provided on the incident surface 1A, the exit surface 1B, and the effective region 10A of each first reflecting surface 1C.

[0094] Figure 13 This is a partially enlarged top view of the optical path deflection element in another embodiment of the present invention. Figure 13 Compared to Figure 12 Specifically, a light-absorbing layer 3 is additionally provided on the surface of the optical path deflection element 1. For example... Figure 13 As shown and combined Figures 10 to 12 When the microstructure 2 is disposed inside the optical path deflection element 1, the light-absorbing layer 3 is disposed on at least one second reflective surface 1D and / or at least one first reflective surface 1C at the position corresponding to the microstructure 2 (i.e., the light-absorbing layer 3 is disposed on the surface of the optical path deflection element 1, at which time the light-absorbing layer 3 cannot be directly disposed on the surface of the microstructure 2).

[0095] Furthermore, such as Figures 1 to 8 As shown, in this embodiment, the plurality of microstructures 2 include a plurality of first microstructures 21, which are disposed corresponding to at least a portion of the second reflective surface 1D. The first microstructures 21 are capable of reflecting stray light. Specifically, in this embodiment, the plurality of first microstructures 21 are disposed corresponding to at least a portion of the front side 13 and at least a portion of the rear side 14, and are disposed on both the front side 13 and the rear side 14. Of course, in other embodiments, the plurality of first microstructures 21 may only correspond to the front side 13; or, the plurality of first microstructures 21 may only correspond to the rear side 14. Meanwhile, as... Figure 10 As shown, in other embodiments, a plurality of first microstructures 21 may also be disposed inside the optical path deflection element 1, and the plurality of first microstructures 21 are respectively disposed close to the front side 13 and the rear side 14. As one implementation, the surface of the first microstructure 21 may be sandblasted and / or have a light-absorbing layer 3 (see reference). Figure 9 ).

[0096] Furthermore, such as Figures 1 to 8 As shown, in this embodiment, the side of the first microstructure 21 closest to the incident surface 1A is directly connected to the top surface 11, that is, the end of the first microstructure 21 closest to the incident surface 1A extends to the top surface 11. This not only improves the reflection effect of the first microstructure 21 on stray light, but also facilitates the fabrication of the first microstructure 21.

[0097] Figure 14 This is a three-dimensional structural diagram of the optical path deflection element in another embodiment of the present invention. Figure 14As shown, in another embodiment, a connecting surface 17 is provided between the second reflecting surface 1D and the top surface 11. The connecting surface 17 is an inclined surface, and it is inclined relative to the top surface 11 and the second reflecting surface 1D. The side of the first microstructure 21 closest to the incident surface 1A is connected to the connecting surface 17, that is, the end of the first microstructure 21 closest to the incident surface 1A extends onto the connecting surface 17. At this time, the first microstructure 21 is connected to the top surface 11 through the connecting surface 17. Of course, in other embodiments, the connecting surface 17 can also be an arc surface. In this embodiment, connecting surfaces 17 are provided between the front side surface 13 and the top surface 11, and between the rear side surface 14 and the top surface 11. By setting the connecting surface 17, on the one hand, the connecting surface 17 can also reflect stray light, allowing stray light to exit through the incident surface 1A and / or the bottom surface 12 to the outside of the optical path conversion element 1, thereby further eliminating stray light (since the connecting surface 17 is inclined towards the bottom surface 12, the connecting surface 17 can more easily allow stray light to exit through the bottom surface 12 to the outside of the optical path conversion element 1); on the other hand, since the corners of the optical path conversion element 1 are prone to breakage during processing, setting the connecting surface 17 is equivalent to chamfering the sides of the optical path conversion element 1, which can reduce the risk of the corners of the optical path conversion element 1 breaking during processing and improve the production yield. Based on this embodiment, the first microstructure 21 can also extend to the connecting surface 17 and connect to the top surface 11, that is, the connecting surface 17 is also provided with the first microstructure 21, which can further improve the reflection effect of the connecting surface 17 on stray light; at the same time, when the connecting surface 17 is also provided with the first microstructure 21, the surface of the first microstructure 21 on the connecting surface 17 can also be sandblasted and / or a light-absorbing layer 3 can be provided.

[0098] Furthermore, such as Figure 7 and Figure 8As shown, in this embodiment, the top surface 11 includes an effective area 10A and an ineffective area 10B (the effective area 10A and the ineffective area 10B of the top surface 11 are indicated by a dotted line to be spaced apart). The ineffective area 10B of the top surface 11 is located around the edge of the top surface 11, and the effective area 10A of the top surface 11 is located within the annular interval enclosed by the ineffective area 10B. The incident surface 1A, the exit surface 1B, and the first intermediate reflecting surface 110 are all provided in the effective area 10A of the top surface 11; the projection of the first microstructure 21 in the thickness direction T falls within the ineffective area 10B of the top surface 11. An absorbent layer (not shown in the figure) is provided on the surface of the ineffective area 10B of the top surface 11. The minimum distance L1 between the first microstructure 21 and the effective area 10A of the top surface 11 is 0.25 mm to 3 mm, or 0.5 mm to 2 mm, or 1 mm to 3 mm, etc. (for example, when the first microstructure 21 is a light-reflecting groove 20, the minimum distance L1 between the groove bottom 204 of the light-reflecting groove 20 and the effective area 10A of the top surface 11 is 0.25 mm to 3 mm). Within this range, under the condition of controlling the size of the optical path turning element 1, the first microstructure 21 can better diffusely reflect stray light and improve the effect of eliminating stray light.

[0099] Further, as Figure 5 shown, in this embodiment, the second reflecting surface 1D (including the front side surface 13 and the rear side surface 14) includes a microstructure area 10, and a plurality of first microstructures 21 are provided corresponding to the microstructure area 10. The optical path turning element 1 has a first direction S1 perpendicular to the incident surface 1A; along the first direction S1, the microstructure area 10 is close to the incident surface 1A, and the height H1 of the microstructure area 10 is greater than or equal to 1 / 5 of the total height H2 of the second reflecting surface 1D. Since stray light generally enters more concentratedly at the upper position of the second reflecting surface 1D, a plurality of first microstructures 21 are at least provided at the upper position of the second reflecting surface 1D, so that the first microstructures 21 can better diffusely reflect stray light and improve the effect of eliminating stray light. Specifically, as Figure 5 shown, in this embodiment, H1 = H2, that is, the first microstructures 21 are provided in the entire height direction of the second reflecting surface 1D, and at least some of the first microstructures 21 extend from the upper end to the lower end of the second reflecting surface 1D. As Figure 19 shown, in another embodiment, 1 / 5H2 ≤ H1 < H2, that is, only a partial area of the second reflecting surface 1D is provided with the first microstructures 21 along its height direction. Optionally, 1 / 5H2 ≤ H1 ≤ H2; or, 1 / 5H2 ≤ H1 ≤ 4 / 5H2; or, 1 / 2H2 ≤ H1 ≤ 4 / 5H2; or, 1 / 5H2 ≤ H1 ≤ 1 / 2H2.

[0100] Further, as Figure 5 and Figure 6As shown, in this embodiment, multiple first microstructures 21 extend in a continuous arc shape, and each arc of the first microstructure 21 is composed of an arc segment. Multiple first microstructures 21 are continuously arranged along the length direction L of the optical path turning element 1, meaning they are densely arranged along the length direction L, or adjacently arranged. Along the length direction L of the optical path turning element 1, the opening direction X of the arcs of the multiple first microstructures 21 generally faces the left side 15, i.e., the first microstructure 21 has a “)” shape. Simultaneously, the angle b between the opening direction X of the arcs of the first microstructure 21 and the first direction S1 of the incident surface 1A is 10° to 80°. This allows the first microstructure 21 to better diffusely reflect stray light, improving the effect of eliminating stray light.

[0101] Figure 17 This is a front view of the optical path deflection element in another embodiment of the present invention. Figure 17 As shown, in another embodiment, multiple first microstructures 21 extend in a continuous arc shape, and the arc of each first microstructure 21 is composed of an arc segment. The multiple first microstructures 21 are continuously arranged along the length direction L of the optical path deflection element 1. Along the length direction L of the optical path deflection element 1, the opening direction of the arcs containing the multiple first microstructures 21 generally faces the right side surface 16, i.e., the first microstructures 21 are in a "(" shape; simultaneously, the angle between the opening direction of the arc of the first microstructure 21 and the normal direction of the incident surface 1A is 10° to 80° (in conjunction with...). Figure 9 ).

[0102] Figure 18 This is a front view of the optical path deflection element in another embodiment of the present invention. Figure 18As shown, in another embodiment, a plurality of first microstructures 21 extend in a continuous arc shape, and the plurality of first microstructures 21 are arranged continuously along the length direction L of the optical path deflection element 1. Among them, the multiple first microstructures 21 are divided into three groups along the length direction L of the optical path turning element 1. The three groups of first microstructures 21 are the first group 21A, the second group 21B, and the third group 21C, and the first group 21A, the second group 21B, and the third group 21C are arranged sequentially along the length direction L. The arcs of the multiple first microstructures 21 in the first group 21A and the multiple first microstructures 21 in the third group 21C are each composed of an arc segment, and the opening direction of the arcs of the multiple first microstructures 21 in the first group 21A and the multiple first microstructures 21 in the third group 21C is generally facing the left side 15 (in other embodiments, it can also be facing the right side 16). The multiple first microstructures 21 in the second group 21B extend in a wavy shape along the thickness direction T. That is, the arcs of the first microstructures 21 in the second group 21B are composed of multiple arc segments connected sequentially, and the opening direction of some arc segments is facing the left side 15, while the opening direction of other arc segments is facing the right side 16.

[0103] Figure 19 This is a front view of the optical path deflection element in another embodiment of the present invention. Figure 19 As shown, in another embodiment, multiple first microstructures 21 extend in an arc shape, and the arc of each first microstructure 21 is composed of an arc segment. The multiple first microstructures 21 are arranged in a fish-scale pattern along the length direction L and thickness direction T of the optical path deflection element 1. Specifically, in this embodiment, multiple first microstructures 21 extend in a circular arc shape, and the radius of the arc of the first microstructure 21 is small. The opening direction of the arc of the multiple first microstructures 21 is facing the left side 15 (in other embodiments, it may be facing the right side 16, or facing other directions); the multiple first microstructures 21 are densely arranged in the length direction L and thickness direction T, thereby forming a fish-scale structure.

[0104] Figure 20 This is a front view of the optical path deflection element in another embodiment of the present invention. Figure 20As shown, in another embodiment, multiple first microstructures 21 extend in a continuous zigzag shape, and the multiple first microstructures 21 are continuously arranged along the length direction L of the optical path deflection element 1. Specifically, in this embodiment, each zigzag line containing a first microstructure 21 includes at least one zigzag unit 23, and each zigzag unit 23 includes a first line segment 231 and a second line segment 232 that are bent and connected. The first line segment 231 extends along a first sub-direction, and the second line segment 232 extends along a second sub-direction. At least some of the zigzag lines containing the first microstructures 21 include multiple sequentially connected zigzag units 23, that is, at least some of the zigzag lines containing the first microstructures 21 are formed by alternating sequential connections of multiple first line segments 231 and multiple second line segments 232. In this embodiment, the first sub-direction is parallel to the thickness direction T, meaning the first line segment 231 extends along the thickness direction T. The second sub-direction is not parallel to the thickness direction T, and the fold line containing each first microstructure 21 generally extends along the thickness direction T. The angle between adjacent first line segments 231 and second line segments 232 can be 95°–175°, 100°–175°, 110°–175°, 120°–170°, or 120°–160°, etc. Of course, in other embodiments, the first line segment 231 and the second line segment 232 can also extend along other directions.

[0105] Figure 21 This is a front view of the optical path deflection element in another embodiment of the present invention. Figure 21As shown, in another embodiment, the plurality of first microstructures 21 include a plurality of first sub-microstructures 211 and a plurality of second sub-microstructures 212. The plurality of second sub-microstructures 212 and the plurality of first sub-microstructures 211 are arranged adjacent to each other. The plurality of first sub-microstructures 211 are arranged close to the incident surface 1A, and the plurality of second sub-microstructures 212 are located on the side of the plurality of first sub-microstructures 211 away from the incident surface 1A. In this embodiment, both the plurality of first sub-microstructures 211 and the plurality of second sub-microstructures 212 extend in an arc shape; the extension direction of the first sub-microstructure 211 is different from the extension direction of the second sub-microstructure 212, and / or, the radius of curvature of the arc where the first sub-microstructure 211 is located is different from the radius of curvature of the arc where the second sub-microstructure 212 is located. Specifically, in this embodiment, the opening direction of the arcs where the multiple first sub-microstructures 211 are located is generally towards the left side 15 (in other embodiments, it may also be towards the right side 16), and the multiple first sub-microstructures 211 are continuously arranged along the length direction L; the multiple second sub-microstructures 212 are all extended in an arc shape, and the opening direction of the arcs where the multiple second sub-microstructures 212 are located is generally towards the left side 15 (in other embodiments, it may also be towards the right side 16). The multiple second sub-microstructures 212 are divided into multiple groups, and the multiple groups of second sub-microstructures 212 are continuously arranged along the length direction L. The arcs where the multiple second sub-microstructures 212 in each group are located are concentrically arranged (that is, the center positions of the arcs where the multiple second sub-microstructures 212 are located are the same).

[0106] like Figure 21As shown, in this embodiment, the second reflective surface 1D includes a microstructure region 10, which includes a first microstructure region 101 and a second microstructure region 102. A plurality of first sub-microstructures 211 are disposed corresponding to the first microstructure region 101, and a plurality of second sub-microstructures 212 are disposed corresponding to the second microstructure region 102. The first microstructure region 101 and the second microstructure region 102 are arranged adjacent to each other along a first direction S1. The first direction S1 is perpendicular to the incident surface 1A, that is, the first direction S1 is parallel to the thickness direction T, that is, the plurality of first sub-microstructures 211 and the plurality of second sub-microstructures 212 are arranged vertically adjacent to each other. In this embodiment, along the first direction S1, the height of the first microstructure region 101 and the height of the second microstructure region 102 can be the same or different; the height H1 of the microstructure region 10 (that is, the sum of the heights of the first microstructure region 101 and the second microstructure region 102) is greater than or equal to 1 / 5 of the total height H2 of the second reflecting surface 1D; or, 1 / 5H2≤H1≤H2; or, 1 / 5H2≤H1≤4 / 5H2; or, 1 / 2H2≤H1≤4 / 5H2; or, 1 / 5H2≤H1≤1 / 2H2. By setting the multiple first microstructures 21 as a combination of multiple first sub-microstructures 211 and multiple second sub-microstructures 212, the extension direction and radius of curvature of the arc of the first sub-microstructures 211 and the second sub-microstructures 212 can be adjusted according to the actual reflection of stray light, so that the first sub-microstructures 211 and the second sub-microstructures 212 can achieve a better diffuse reflection effect on stray light, thereby forming a higher degree of design freedom.

[0107] Figure 22 This is a front view of the optical path deflection element in another embodiment of the present invention. Figure 22 As shown, in another embodiment, the plurality of first microstructures 21 also include a plurality of first sub-microstructures 211 and a plurality of second sub-microstructures 212, and the plurality of first sub-microstructures 211 and the plurality of second sub-microstructures 212 are also arranged adjacently along the first direction S1; and with Figure 21 The embodiment shown differs from the one described above in that: in this embodiment, the plurality of second sub-microstructures 212 extend in an arc shape, and each second sub-microstructure 212 is a wavy structure extending along the length direction L. Each second sub-microstructure 212 is formed by a plurality of arc segments connected sequentially, and the opening direction of the plurality of arc segments is towards the top surface 11 (in other embodiments, the opening direction of the plurality of arc segments may also be towards the bottom surface 12; or, among the plurality of arc segments, some arc segments have opening directions towards the top surface 11, and other arc segments have opening directions towards the bottom surface 12). Other structures of this embodiment are similar to those shown above. Figure 21 The embodiments shown are the same or similar, and will not be described in detail here.

[0108] Figure 23 This is a front view of the optical path deflection element in another embodiment of the present invention. Figure 23 As shown, in another embodiment, the plurality of first microstructures 21 also include a plurality of first sub-microstructures 211 and a plurality of second sub-microstructures 212, and the plurality of first sub-microstructures 211 and the plurality of second sub-microstructures 212 are also arranged adjacently along the first direction S1; and with Figure 21 The embodiment shown differs in that, in this embodiment, the plurality of first sub-microstructures 211 extend in a zigzag shape, and the plurality of second sub-microstructures 212 extend in an arc shape. Specifically, in this embodiment, the zigzag line containing each first sub-microstructure 211 extends approximately along the thickness direction T, and each second sub-microstructure 212 is a wavy structure extending along the length direction L. Other structures in this embodiment are similar to... Figure 21 The embodiments shown are the same or similar, and will not be described in detail here.

[0109] Figure 24 This is a front view of the optical path deflection element in another embodiment of the present invention. Figure 24 As shown, in another embodiment, the plurality of first microstructures 21 also include a plurality of first sub-microstructures 211 and a plurality of second sub-microstructures 212, and the plurality of first sub-microstructures 211 and the plurality of second sub-microstructures 212 are also arranged adjacently along the first direction S1; and with Figure 21 The embodiment shown differs from the one in that, in this embodiment, the plurality of first sub-microstructures 211 extend in an arc shape, and the plurality of second sub-microstructures 212 extend in a zigzag shape. Specifically, in this embodiment, the zigzag line containing each second sub-microstructure 212 extends approximately along the length direction L. Other structures in this embodiment are similar to... Figure 21 The embodiments shown are the same or similar, and will not be described in detail here.

[0110] Figure 25 This is a front view of the optical path deflection element in another embodiment of the present invention. Figure 25 As shown, in another embodiment, the plurality of first microstructures 21 also include a plurality of first sub-microstructures 211 and a plurality of second sub-microstructures 212, and the plurality of first sub-microstructures 211 and the plurality of second sub-microstructures 212 are also arranged adjacently along the first direction S1; and with Figure 21 The embodiment shown differs in that, in this embodiment, the plurality of first sub-microstructures 211 and the plurality of second sub-microstructures 212 extend in a zigzag shape, and the extension directions of the first sub-microstructures 211 and the second sub-microstructures 212 are different. Specifically, in this embodiment, the zigzag line containing each first sub-microstructure 211 extends generally along the thickness direction T, and the zigzag line containing each second sub-microstructure 212 extends generally along the length direction L. Other structures in this embodiment are similar to... Figure 21 The embodiments shown are the same or similar, and will not be described in detail here.

[0111] Figure 26This is a front view of the optical path deflection element in another embodiment of the present invention. Figure 26 As shown, in another embodiment, the plurality of first microstructures 21 include a plurality of first sub-microstructures 211 and a plurality of second sub-microstructures 212. The plurality of second sub-microstructures 212 and the plurality of first sub-microstructures 211 are arranged adjacent to each other. The plurality of first sub-microstructures 211 are arranged close to the incident surface 1A, and the plurality of second sub-microstructures 212 are located on the side of the plurality of first sub-microstructures 211 away from the incident surface 1A. In this embodiment, the second reflecting surface 1D includes a microstructure region 10, which includes a first microstructure region 101 and a second microstructure region 102. The plurality of first sub-microstructures 211 are arranged corresponding to the first microstructure region 101, and the plurality of second sub-microstructures 212 are arranged corresponding to the second microstructure region 102. The first microstructure region 101 and the second microstructure region 102 are arranged adjacent to each other along a second direction S2. The second direction S2 is parallel to both the incident surface 1A and the second reflecting surface 1D, that is, the second direction S2 is parallel to the length direction L, that is, the plurality of first sub-microstructures 211 and the plurality of second microstructures 212 are arranged adjacent to each other on the left and right. In this embodiment, multiple first sub-microstructures 211 and multiple second sub-microstructures 212 extend in an arc shape. The extension direction of the first sub-microstructures 211 is different from that of the second sub-microstructures 212, and / or, the radius of curvature of the arc where the first sub-microstructures 211 are located is different from that of the arc where the second sub-microstructures 212 are located. Specifically, the opening direction of the arc where the multiple first sub-microstructures 211 are located is generally towards the left side 15, and the multiple first sub-microstructures 211 are continuously arranged along the length direction L; the opening direction of the arc where the multiple second sub-microstructures 212 are located is generally towards the right side 16, and the multiple second sub-microstructures 212 are continuously arranged along the length direction L. Of course, in other embodiments, refer to Figures 21 to 25 Alternatively, multiple first sub-microstructures 211 and multiple second sub-microstructures 212 may extend in a zigzag shape, with the extension direction of the first sub-microstructure 211 being different from that of the second sub-microstructure 212; or multiple first sub-microstructures 211 may extend in an arc shape, and multiple second sub-microstructures 212 may extend in a zigzag shape; or multiple first sub-microstructures 211 may extend in a zigzag shape, and multiple second sub-microstructures 212 may extend in an arc shape.

[0112] Furthermore, such as Figures 1 to 4 As shown, in this embodiment, the bottom surface 12 of the optical path deflection element 1 is a flat structure, and no microstructure 2 is provided on the bottom surface 12 of the optical path deflection element 1. Thus, when some stray light is reflected by the first microstructure 21 on the second reflecting surface 1D, it can pass through the bottom surface 12 and exit to the outside of the optical path deflection element 1.

[0113] Figure 15 This is a bottom view of the optical path reversing element in another embodiment of the present invention. Figure 16This is a bottom view of the optical path deflection element in another embodiment of the present invention. Figure 15 As shown, in another embodiment, the plurality of microstructures 2 further includes a plurality of second microstructures 22, which are disposed corresponding to at least one invalid region 10B of the first reflecting surface 1C. The second microstructures 22 are capable of reflecting stray light, allowing some stray light to exit through the incident surface 1A to the outside of the optical path deflection element 1. Specifically, in this embodiment, the plurality of second microstructures 22 are disposed corresponding to the bottom surface 12, and the second microstructures 22 are disposed on the bottom surface 12; of course, in other embodiments, the second microstructures 22 can also be disposed inside the optical path deflection element 1, and the second microstructures 22 are disposed close to the bottom surface 12. At the same time, the plurality of second microstructures 22 can also be disposed corresponding to other invalid regions 10B of the first reflecting surface 1C. Specifically, the plurality of second microstructures 22 can be disposed corresponding to the invalid region 10B of at least one of the top surface 11, bottom surface 12, left side surface 15, and right side surface 16. In this embodiment, the second microstructure 22 is provided on the entire bottom surface 12; of course, in other embodiments, the second microstructure 22 may be provided on a portion of the bottom surface 12. Simultaneously, the surface of the second microstructure 22 may also be sandblasted and / or have a light-absorbing layer 3 (see reference). Figure 9 ).like Figure 15 As shown, in this embodiment, the second microstructure 22 extends in an arc shape; as Figure 16 As shown, in another embodiment, the second microstructure 22 can also extend in a zigzag shape. Of course, in other embodiments, the second microstructure 22 can also employ two sub-microstructures with different extension shapes / directions, for example, one sub-microstructure is an arc-shaped extension, and the other is a zigzag extension (see reference). Figures 21 to 26 ).

[0114] It should be noted that the reference Figure 4 , Figure 15 and Figure 27 According to the designed optical path, when the effective light undergoes three reflections within the optical path transition element 1, the bottom surface 12 does not participate in the reflection of the effective light; that is, the bottom surface 12 only includes the ineffective region 10B. At this time, the second microstructure 22 and / or the light-absorbing layer 3 can be disposed on the entire bottom surface 12. (Reference) Figure 28 According to the designed optical path, when the effective light undergoes five reflections within the optical path turning element 1, the bottom surface 12 participates in the reflection of the effective light. That is, the bottom surface 12 simultaneously includes the effective region 10A and the ineffective region 10B. Therefore, the second microstructure 22 and / or the light-absorbing layer 3 can only be set on the ineffective region 10B of the bottom surface 12.

[0115] Furthermore, such as Figures 1 to 5As shown, in this embodiment, a light-absorbing groove 18 is provided on the bottom surface 12. Along the length direction L, the light-absorbing groove 18 is located between the left side surface 15 and the right side surface 16. The light-absorbing groove 18 penetrates the bottom surface 12 and the second reflective surface 1D, but does not penetrate the top surface 11. Specifically, the light-absorbing groove 18 penetrates the bottom surface 12 along the thickness direction T, and penetrates the front side surface 13 and the rear side surface 14 along the width direction W. That is, the light-absorbing groove 18 is formed by a recess from the bottom surface 12 towards the top surface 11. By setting the light-absorbing groove 18, the light-absorbing groove 18 can block light, preventing effective light from being directly reflected from the left side surface 15 to the right side surface 16 and then emitted through the exit surface 1B, thereby ensuring that the optical path length of the effective light meets the long focal length requirement of the camera module. The setting position of the light-absorbing groove 18 can be determined according to the reflection optical path of the effective light, such as... Figure 4 and Figure 27 As shown, when the bottom surface 12 does not participate in the reflection of effective light, the extinction groove 18 can be positioned at the middle of the bottom surface 12 along the length direction L; as Figure 28 As shown, when the bottom surface 12 participates in the reflection of effective light, in order to avoid the extinction groove 18 interfering with the designed optical path of the effective light, the extinction groove 18 can be set on opposite sides of the middle position of the bottom surface 12 along the length direction L, that is, the extinction groove 18 is set on opposite sides of the second intermediate reflective surface 120.

[0116] Furthermore, such as Figures 1 to 5 As shown, in this embodiment, the wall of the matting groove 18 is a smooth structure, that is, no microstructures are provided on the wall of the matting groove 18.

[0117] like Figure 19 As shown, in another embodiment, at least a portion of the wall of the extinction groove 18 is provided with a plurality of third microstructures 181, each of which extends along the width direction W. The third microstructure 181 can diffusely reflect stray light, thereby improving the effect of eliminating stray light. Of course, the third microstructure 181 can also extend in other directions, such as along the thickness direction T. The third microstructure 181 can be similar to the microstructure 2 described above, that is, the third microstructure 181 extends in an arc shape or a zigzag shape; in other embodiments, the third microstructure 181 can also extend in a straight line. Specifically, the third microstructure 181 can be a reflective groove with a V-shaped cross-section. At the same time, the surface of the third microstructure 181 can also be sandblasted and / or have a light-absorbing layer 3 (see reference). Figure 9 In this embodiment, an inclined groove surface 180 is provided on the side of the groove wall of the extinction groove 18 near the right side surface 16. The upper side of the inclined groove surface 180 is inclined away from the right side surface 16 compared to its lower side. A plurality of third microstructures 181 are disposed on the inclined groove surface 180, which can help improve the effect of eliminating stray light.

[0118] This utility model embodiment also provides an electronic device, including the camera module described above. This electronic device includes, but is not limited to, mobile phones, computers, etc.

[0119] Example 1

[0120] Structural reference of optical path deflection element 1 in Example 1 Figures 1 to 8 The optical path deflector 1 has a wedge-shaped structure and is made of glass (specifically, H-QF50 type glass). Multiple first microstructures 21 are respectively provided on the front side 13 and rear side 14 of the optical path deflector 1. These multiple first microstructures 21 extend in an arc shape, with their openings facing the left side 15, and are continuously arranged along the length L of the optical path deflector 1. Each first microstructure 21 is a V-shaped reflective groove 20. The angle α between the first side groove surface 201 and the second side groove surface 202 of the reflective groove 20 is 15°, the width L2 of the groove opening 203 is 0.1 mm, the radius R of the arc line containing the first microstructure 21 is 1 mm, and the angle b between the opening direction X of the arc line containing the first microstructure 21 and the first direction S1 of the incident surface 1A is 60°.

[0121] Example 2

[0122] Structural reference of optical path deflection element 1 in Example 2 Figures 1 to 8 The difference between Embodiment 2 and Embodiment 1 is that the included angle α between the first side groove surface 201 and the second side groove surface 202 of the reflective groove 20 is 30°. The other structures and parameters of Embodiment 2 are the same as those of Embodiment 1, and will not be repeated here.

[0123] Example 3

[0124] Structural reference of optical path deflection element 1 in Example 3 Figures 1 to 8 The difference between Embodiment 3 and Embodiment 1 is that the included angle α between the first side groove surface 201 and the second side groove surface 202 of the reflective groove 20 is 40°. The other structures and parameters of Embodiment 3 are the same as those of Embodiment 1, and will not be repeated here.

[0125] Example 4

[0126] Structural reference of optical path deflection element 1 in Example 4 Figures 1 to 8 The difference between Embodiment 4 and Embodiment 1 is that the included angle α between the first side groove surface 201 and the second side groove surface 202 of the reflective groove 20 is 50°. The other structures and parameters of Embodiment 4 are the same as those of Embodiment 1, and will not be repeated here.

[0127] Example 5

[0128] Structural reference of optical path deflection element 1 in Example 5 Figures 1 to 8 The difference between Embodiment 5 and Embodiment 1 is that the included angle α between the first side groove surface 201 and the second side groove surface 202 of the reflective groove 20 is 60°. The other structures and parameters of Embodiment 5 are the same as those of Embodiment 1, and will not be repeated here.

[0129] Example 6

[0130] Structural reference of optical path deflection element 1 in Example 6 Figures 1 to 8 The difference between Embodiment 6 and Embodiment 1 is that the included angle α between the first side groove surface 201 and the second side groove surface 202 of the reflective groove 20 is 70°. The other structures and parameters of Embodiment 6 are the same as those of Embodiment 1, and will not be repeated here.

[0131] Example 7

[0132] Structural reference of optical path deflection element 1 in Example 7 Figures 1 to 8 The difference between Embodiment 7 and Embodiment 1 is that the included angle α between the first side groove surface 201 and the second side groove surface 202 of the reflective groove 20 is 80°. The other structures and parameters of Embodiment 7 are the same as those of Embodiment 1, and will not be repeated here.

[0133] Example 8

[0134] Structural reference of optical path deflection element 1 in Example 8 Figures 1 to 8 The difference between Example 8 and Example 6 is that the width L2 of the groove 203 of the reflective groove 20 is 0.05 mm. The other structures and parameters of Example 8 are the same as those of Example 6, and will not be repeated here.

[0135] Example 9

[0136] Structural reference of optical path deflection element 1 in Example 9 Figures 1 to 8 The difference between Example 9 and Example 6 is that the width L2 of the groove 203 of the reflective groove 20 is 0.3 mm. The other structures and parameters of Example 9 are the same as those of Example 6, and will not be repeated here.

[0137] Example 10

[0138] Structural reference of optical path deflection element 1 in Example 10 Figures 1 to 8 The difference between Example 10 and Example 6 is that the width L2 of the groove 203 of the reflective groove 20 is 0.7 mm. The other structures and parameters of Example 10 are the same as those of Example 6, and will not be repeated here.

[0139] Example 11

[0140] Structural reference of optical path deflection element 1 in Example 11 Figures 1 to 8The difference between Example 11 and Example 6 is that the radius R of the arc of the first microstructure 21 is 3.85 mm. The other structures and parameters of Example 11 are the same as those of Example 6, and will not be repeated here.

[0141] Example 12

[0142] Structural reference of optical path deflection element 1 in Example 12 Figures 1 to 8 The difference between Example 12 and Example 6 is that the radius R of the arc of the first microstructure 21 is 10 mm. The other structures and parameters of Example 12 are the same as those of Example 6, and will not be repeated here.

[0143] Example 13

[0144] Structural reference of optical path deflection element 1 in Example 13 Figures 1 to 8 The difference between Example 13 and Example 6 is that the radius R of the arc line where the first microstructure 21 is located is 20 mm. The other structures and parameters of Example 13 are the same as those of Example 6, and will not be repeated here.

[0145] Example 14

[0146] Structural reference of optical path deflection element 1 in Example 14 Figures 1 to 8 The difference between Example 14 and Example 6 is that the angle b between the opening direction X of the arc where the first microstructure 21 is located and the first direction S1 of the incident surface 1A is 10°. The other structures and parameters of Example 14 are the same as those of Example 6, and will not be repeated here.

[0147] Example 15

[0148] Structural reference of optical path deflection element 1 in Example 15 Figures 1 to 8 The difference between Example 15 and Example 6 is that the angle b between the opening direction X of the arc where the first microstructure 21 is located and the first direction S1 of the incident surface 1A is 20°. The other structures and parameters of Example 15 are the same as those of Example 6, and will not be repeated here.

[0149] Example 16

[0150] Structural reference of optical path deflection element 1 in Example 16 Figures 1 to 8 The difference between Example 16 and Example 6 is that the angle b between the opening direction X of the arc where the first microstructure 21 is located and the first direction S1 of the incident surface 1A is 40°. The other structures and parameters of Example 16 are the same as those of Example 6, and will not be repeated here.

[0151] Example 17

[0152] Structural reference of optical path deflection element 1 in Example 17 Figures 1 to 8The difference between Example 17 and Example 6 is that the angle b between the opening direction X of the arc where the first microstructure 21 is located and the first direction S1 of the incident surface 1A is 80°. The other structures and parameters of Example 17 are the same as those of Example 6, and will not be repeated here.

[0153] Example 18

[0154] Structural reference of optical path deflection element 1 in Example 18 Figure 17 The difference between Example 18 and Example 6 is that the openings of the plurality of first microstructures 21 all face the right side 16. The other structures and parameters of Example 18 are the same as those of Example 6, and will not be repeated here.

[0155] Example 19

[0156] Structural reference of optical path deflection element 1 in Example 19 Figure 18 The difference between Embodiment 19 and Embodiment 6 is that, among the plurality of first microstructures 21, along the length direction L of the optical path deflection element 1, the plurality of first microstructures 21 are divided into a first group 21A, a second group 21B, and a third group 21C. The opening direction of the arcs containing the plurality of first microstructures 21 in the first group 21A and the plurality of first microstructures 21 in the third group 21C both faces the left side 15. The plurality of first microstructures 21 in the second group 21B extend in a wavy shape approximately along the thickness direction T. The other structures and parameters of Embodiment 19 are the same as those of Embodiment 6, and will not be repeated here.

[0157] Example 20

[0158] Structural reference of optical path deflection element 1 in Example 20 Figure 19 The difference between Example 19 and Example 6 is that the radius R of the arc where the first microstructure 21 is located is 0.1 mm, the angle b between the opening direction X of the arc where the first microstructure 21 is located and the first direction S1 of the incident surface 1A is 90°, and the multiple first microstructures 21 are arranged in a fish-scale pattern along the length direction L and thickness direction T of the optical path deflection element 1. Other structures and parameters of Example 19 are the same as those of Example 6 and will not be repeated here.

[0159] Example 21

[0160] Structural reference of optical path deflection element 1 in Example 21 Figure 20 The difference between Embodiment 21 and Embodiment 6 is that the plurality of first microstructures 21 extend in a continuous zigzag shape, and the zigzag line containing each first microstructure 21 extends approximately along the thickness direction T. The plurality of first microstructures 21 are arranged continuously along the length direction L of the optical path deflection element 1. The other structures and parameters of Embodiment 21 are the same as those of Embodiment 6, and will not be described in detail here.

[0161] Example 22

[0162] Structural reference of optical path switching element 1 in Example 22 Figure 21 The difference between Embodiment 22 and Embodiment 6 is that: the plurality of first microstructures 21 include a plurality of first sub-microstructures 211 and a plurality of second sub-microstructures 212, which are arranged vertically adjacent to each other; the plurality of first sub-microstructures 211 and the plurality of second sub-microstructures 212 are all arc-shaped, and the opening direction of the arc of the plurality of first sub-microstructures 211 is facing the left side 15; the plurality of first sub-microstructures 211 are arranged continuously along the length direction L; the plurality of second sub-microstructures 212 are divided into multiple groups, and the multiple groups of second sub-microstructures 212 are arranged continuously along the length direction L; the arc of the plurality of second sub-microstructures 212 in each group is concentrically arranged.

[0163] The other structures and parameters of Example 22 are the same as those of Example 6, and will not be repeated here.

[0164] Example 23

[0165] Structural reference of optical path deflection element 1 in Example 23 Figure 22 The difference between Embodiment 23 and Embodiment 22 is that the plurality of second sub-microstructures 212 extend in an arc shape, and each second sub-microstructure 212 is a wavy structure extending along the length direction L. Each second sub-microstructure 212 is composed of a plurality of arc segments connected sequentially, and the opening direction of the plurality of arc segments is towards the top surface 11. The other structures and parameters of Embodiment 23 are the same as those of Embodiment 22, and will not be described in detail here.

[0166] Example 24

[0167] Structural reference of optical path deflection element 1 in Example 24 Figure 23 The difference between Example 24 and Example 23 is that the multiple first sub-microstructures 211 extend in a zigzag shape, and the zigzag line containing each first sub-microstructure 211 extends approximately along the thickness direction T. The other structures and parameters of Example 24 are the same as those of Example 23, and will not be repeated here.

[0168] Example 25

[0169] Structural reference of optical path deflection element 1 in Example 25 Figure 24 The difference between Example 25 and Example 23 is that the multiple second sub-microstructures 212 extend in a zigzag shape, and the zigzag line containing each second sub-microstructure 212 extends approximately along the length direction L. The other structures and parameters of Example 25 are the same as those of Example 23, and will not be repeated here.

[0170] Example 26

[0171] Structural reference of optical path deflection element 1 in Example 26 Figure 25The difference between Embodiment 26 and Embodiment 25 is that the plurality of first sub-microstructures 211 also extend in a zigzag shape, and the zigzag line containing each first sub-microstructure 211 extends approximately along the thickness direction T. The other structures and parameters of Embodiment 26 are the same as those of Embodiment 25, and will not be described in detail here.

[0172] Example 27

[0173] Structural reference of optical path deflection element 1 in Example 27 Figure 26 The difference between Embodiment 27 and Embodiment 22 is that: multiple first sub-microstructures 211 and multiple second sub-microstructures 212 are arranged adjacent to each other on the left and right sides, and both the multiple first sub-microstructures 211 and multiple second sub-microstructures 212 extend in an arc shape. The opening direction of the arc of the multiple first sub-microstructures 211 is towards the left side 15, and the multiple first sub-microstructures 211 are continuously arranged along the length direction L; the opening direction of the arc of the multiple second sub-microstructures 212 is towards the right side 16, and the multiple second sub-microstructures 212 are continuously arranged along the length direction L. The other structures and parameters of Embodiment 27 are the same as those of Embodiment 22, and will not be described again here.

[0174] Comparative Example

[0175] The optical path deflection element in the comparative example differs from that in Example 1 in that the optical path deflection element in the comparative example does not have a first microstructure.

[0176] The following tests were performed on each optical path reversing element in Examples 1 to 27 and the comparative examples: The lens was placed at the incident surface of the optical path reversing element, and a beam of light with a luminous flux of 4e+8lm was passed through the lens and then into the optical path reversing element. The angle between the incident angle of the light and the optical axis of the lens was 20°. Then the illuminance of stray light was measured at the exit surface of the optical path reversing element.

[0177] The structural parameters and test results of each embodiment and comparative example are shown in the table below. Figure 29 and Figure 30 As shown:

[0178]

[0179]

[0180] in, Figure 29 The illuminance diagram for Example 1 (illuminance diagrams for other examples are similar). Figure 29 (Similar to other images, therefore not shown in the attached diagram) Figure 30 This is a comparative illuminance diagram. From Figure 29 and Figure 30It can be seen that after setting the first microstructure on the optical path reversing element in Example 1, stray light can be significantly reduced and imaging quality improved; while the comparative example, due to the absence of the first microstructure, suffers from severe stray light interference. As can be seen from the table above, because Examples 1 to 27 have the first microstructure on the optical path reversing element, the illuminance of stray light can be significantly reduced, and the illuminance of stray light in each example meets the corresponding requirements (the threshold for stray light illuminance is generally 1e+6 lux); while the comparative example, due to the absence of the first microstructure, has stray light illuminance exceeding the threshold and does not meet the corresponding requirements.

[0181] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. An optical path reversing element, characterized in that, The optical path deflection element (1) is provided with an incident surface (1A), an exit surface (1B), at least one first reflecting surface (1C), and at least one second reflecting surface (1D). The optical path deflection element (1) is provided with a plurality of microstructures (2), and the plurality of microstructures (2) are provided corresponding to at least one second reflecting surface (1D) and / or at least one first reflecting surface (1C). The microstructures (2) extend in an arc shape or a zigzag shape. The effective light enters the optical path reversing element (1) through the incident surface (1A), and after being reflected by at least one of the first reflecting surfaces (1C), it exits through the exit surface (1B) to the outside of the optical path reversing element (1). After the stray light enters the optical path reversing element (1) through the incident surface (1A), at least a portion of the stray light is reflected in the direction toward the incident surface (1A) under the action of the microstructure (2), so that at least a portion of the stray light exits through the incident surface (1A) to the outside of the optical path reversing element (1).

2. The optical path switching element as described in claim 1, characterized in that, The microstructure (2) includes a plurality of first microstructures (21), which are disposed in at least a portion of the second reflective surface (1D).

3. The optical path switching element as described in claim 2, characterized in that, The second reflective surface (1D) includes a front side (13) and a rear side (14) of the optical path deflection element (1), and a plurality of the first microstructures (21) are disposed corresponding to at least a portion of the front side (13) and / or at least a portion of the rear side (14).

4. The optical path switching element as described in claim 2, characterized in that, The first reflecting surface (1C) includes the top surface (11) and the bottom surface (12) of the optical path deflection element (1), the incident surface (1A) is disposed on the top surface (11), and the exiting surface (1B) is disposed on the top surface (11) or the bottom surface (12); The first microstructure (21) is directly connected to the top surface (11) on the side closer to the incident surface (1A); or, a connecting surface (17) is provided between the second reflecting surface (1D) and the top surface (11), the connecting surface (17) being an inclined surface or an arc surface, and the first microstructure (21) is connected to the connecting surface (17) on the side closer to the incident surface (1A).

5. The optical path switching element as described in claim 4, characterized in that, The top surface (11) includes an effective area (10A) and an ineffective area (10B). A light-absorbing layer (3) is provided on the ineffective area (10B) of the top surface (11). The minimum distance (L1) between the first microstructure (21) and the effective area (10A) of the top surface (11) is 0.25mm to 3mm.

6. The optical path switching element as described in claim 2, characterized in that, The second reflective surface (1D) includes a microstructure region (10), and a plurality of first microstructures (21) are disposed corresponding to the microstructure region (10); the optical path deflection element (1) has a first direction (S1) perpendicular to the incident surface (1A), and along the first direction (S1), the microstructure region (10) is close to the incident surface (1A), and the height (H1) of the microstructure region (10) is greater than or equal to 1 / 5 of the total height (H2) of the second reflective surface (1D).

7. The optical path switching element as described in claim 2, characterized in that, The first microstructure (21) extends in a continuous arc shape, and multiple first microstructures (21) are arranged continuously along the length direction (L) of the optical path deflection element (1); Alternatively, the first microstructure (21) extends in a zigzag shape, and a plurality of the first microstructures (21) are arranged continuously along the length direction (L) of the optical path deflection element (1); Alternatively, the first microstructure (21) extends in an arc shape, and a plurality of the first microstructures (21) are arranged in a fish-scale pattern along the length direction (L) and / or thickness direction (T) of the optical path deflection element (1).

8. The optical path switching element as described in claim 2, characterized in that, The plurality of first microstructures (21) include a plurality of first sub-microstructures (211) and a plurality of second sub-microstructures (212). The plurality of second sub-microstructures (212) and the plurality of first sub-microstructures (211) are arranged adjacent to each other. The plurality of first sub-microstructures (211) are arranged close to the incident surface (1A). The plurality of second sub-microstructures (212) are located on the side of the plurality of first sub-microstructures (211) away from the incident surface (1A).

9. The optical path switching element as described in claim 8, characterized in that, The second reflective surface (1D) includes a microstructure region (10), which includes a first microstructure region (101) and a second microstructure region (102). A plurality of first sub-microstructures (211) are arranged corresponding to the first microstructure region (101), and a plurality of second sub-microstructures (212) are arranged corresponding to the second microstructure region (102). The first microstructure region (101) and the second microstructure region (102) are arranged adjacent to each other along a first direction (S1) or a second direction (S2). The first direction (S1) is perpendicular to the incident surface (1A), and the second direction (S2) is parallel to both the incident surface (1A) and the second reflective surface (1D).

10. The optical path switching element as described in claim 8, characterized in that, Multiple first sub-microstructures (211) and multiple second sub-microstructures (212) extend in an arc shape; the extension direction of the first sub-microstructure (211) is different from the extension direction of the second sub-microstructure (212), and / or, the radius of curvature of the arc where the first sub-microstructure (211) is located is different from the radius of curvature of the arc where the second sub-microstructure (212) is located; Alternatively, multiple first sub-microstructures (211) and multiple second sub-microstructures (212) may extend in a zigzag shape, with the extension direction of the first sub-microstructure (211) being different from the extension direction of the second sub-microstructure (212). Alternatively, multiple first sub-microstructures (211) may extend in an arc shape, and multiple second sub-microstructures (212) may extend in a zigzag shape; Alternatively, multiple first sub-microstructures (211) may extend in a zigzag shape, and multiple second sub-microstructures (212) may extend in an arc shape.

11. The optical path switching element as described in claim 1, characterized in that, Each of the first reflective surfaces (1C) includes an invalid region (10B); the microstructure (2) includes a plurality of second microstructures (22), the plurality of second microstructures (22) being provided corresponding to at least one invalid region (10B) of the first reflective surface (1C).

12. The optical path switching element as described in claim 11, characterized in that, The first reflective surface (1C) includes the top surface (11), bottom surface (12), left side surface (15), and right side surface (16) of the optical path deflection element (1), and a plurality of second microstructures (22) are provided corresponding to the invalid region (10B) of at least one of the top surface (11), the bottom surface (12), the left side surface (15), and the right side surface (16).

13. The optical path switching element as described in claim 1, characterized in that, Each of the first reflective surfaces (1C) includes an invalid region (10B), and at least one of the invalid regions (10B) of the first reflective surface (1C) is provided with a light-absorbing layer (3).

14. The optical path switching element as described in claim 1, characterized in that, The first reflective surface (1C) includes a bottom surface (12), a left side surface (15), and a right side surface (16) of the optical path deflection element (1); an extinction groove (18) is provided on the bottom surface (12), the extinction groove (18) is located between the left side surface (15) and the right side surface (16), and the extinction groove (18) penetrates the bottom surface (12) and the second reflective surface (1D); at least a portion of the groove wall of the extinction groove (18) is provided with a plurality of third microstructures (181).

15. The optical path switching element as described in claim 1, characterized in that, At least a portion of the microstructure (2) extends in an arc shape, and the angle (b) between the opening direction (X) of the arc of the microstructure (2) and the first direction (S1) is 10° to 80°; wherein, the first direction (S1) is perpendicular to the incident surface (1A). And / or, at least part of the microstructure (2) extends in an arc shape, and the radius of the arc of the arc where the microstructure (2) extends in an arc is 0.1 mm to 20 mm; And / or, at least part of the microstructure (2) is a reflective groove (20) with a V-shaped cross-section, the groove surface of the reflective groove (20) including a first side groove surface (201) and a second side groove surface (202) opposite to each other; the included angle (a) between the first side groove surface (201) and the second side groove surface (202) is 15° to 80°, and / or, the width (L2) of the groove opening (203) of the reflective groove (20) is 0.05 mm to 0.7 mm.

16. The optical path switching element as described in any one of claims 1-15, characterized in that, The microstructure (2) is disposed on at least one of the second reflective surfaces (1D) and / or at least one of the first reflective surfaces (1C).

17. The optical path switching element as described in claim 16, characterized in that, The surface of the microstructure (2) is provided with a light-absorbing layer (3); And / or, the surface of the microstructure (2) is sandblasted.

18. The optical path switching element as described in any one of claims 1-15, characterized in that, The microstructure (2) is disposed inside the optical path deflection element (1) and is disposed close to at least one second reflective surface (1D) and / or at least one first reflective surface (1C).

19. The optical path switching element as described in claim 18, characterized in that, The microstructure (2) is formed inside the optical path deflection element (1) by laser engraving; And / or, at least one of the second reflective surfaces (1D) and / or at least one of the first reflective surfaces (1C) are provided with a light-absorbing layer (3) at a position corresponding to the microstructure (2).

20. A camera module, characterized in that, The device includes a lens (4), an image sensor (5), and an optical path deflection element (1) as described in any one of claims 1-19. The lens (4) is disposed corresponding to the incident surface (1A) of the optical path deflection element (1), and the image sensor (5) is disposed corresponding to the exit surface (1B) of the optical path deflection element (1).

21. An electronic device, characterized in that, Includes the camera module as described in claim 20.

Images