Manufacturing method for light guide structure, and light guide structure

Abstract

The present application provides a manufacturing method for a light guide structure, and a light guide structure. The manufacturing method for a light guide structure comprises: step S1: on the basis of a design drawing of a light guide structure to be manufactured, obtaining a mold of the light guide structure to be manufactured; step S2: using a chamfering cutter or a ball-end cutter to mill a surface of the mold to form a groove array; step S3: carrying out roughening treatment on the surface of the mold having the groove array; and step S4: assembling the mold, and carrying out an injection molding process to form a light guide structure, wherein the light guide structure is provided with a reflecting surface, the reflecting surface is formed by the surface of the mold having the groove array, and the reflecting surface has a roughness obtained after the roughening treatment and is provided with a bump array complementary to the groove array. The present application solves the problems in the prior art of high cost and high operation difficulty of light guide structure manufacturing.

Description

Manufacturing method of light guide structure and light guide structure

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the Patent Office of China on September 25, 2023, with application number 202311247748.7 and application name “Manufacturing method of light-guiding structure and light-guiding structure”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the technical field of contact image sensing devices, and in particular to a method for manufacturing a light guide structure and the light guide structure. Background Art

[0004] With the advancement of technology and the continuous upgrading of equipment, the light-guiding structures used in image sensors have also been continuously updated. Existing methods for manufacturing light-guiding structures include printing and non-printing processes. Due to the high precision of non-printing processes, they are gradually being adopted and implemented by major manufacturers.

[0005] Currently, there are many non-printing processes for light-guiding structures, primarily using single-crystal diamond tools to create V-cut grooves on the mold or using a dot impactor to create a regular dot pattern. These V-cut grooves and dots typically range in width from 50µm to 200µm, or even smaller, requiring very high precision. These equipment and tools are also relatively expensive, resulting in high costs. Furthermore, the equipment and process are complex and difficult to operate, making them difficult for operators to master.

[0006] That is to say, the manufacturing of the light guide structure in the prior art has the problems of high cost and great difficulty in operation.

[0007] Application Contents

[0008] The main purpose of the present application is to provide a method for manufacturing a light guide structure and a light guide structure, so as to solve the problems of high cost and great difficulty in operation in the manufacture of light guide structures in the prior art.

[0009] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a manufacturing method of a light-guiding structure is provided, including: step S1: obtaining a mold of the light-guiding structure to be manufactured according to the design drawing of the light-guiding structure to be manufactured; step S2: using a chamfering knife or a ball knife to mill the surface of the mold to form a groove array; step S3: roughening the surface of the mold with the groove array; step S4: assembling the mold and then forming a light-guiding structure after an injection molding process, the light-guiding structure having a reflective surface, the reflective surface being formed by the surface of the mold with the groove array, the reflective surface having a roughness after roughening treatment and a protrusion array complementary to the groove array.

[0010] Optionally, after step S3, the roughness of the surface of the mold having the groove array is greater than or equal to Ra0.6 and less than or equal to Ra0.9.

[0011] Optionally, in step S3, the roughening treatment includes sandblasting or electric spark electrode treatment.

[0012] Optionally, in step S3, the sandblasting includes: performing sandblasting on the surface of the mold having the groove array to form a surface with a roughness greater than or equal to Ra0.6.

[0013] Optionally, in step S3, the electric spark electrode processing includes: step S31: manufacturing an electric spark electrode with a complementary shape to the surface of the mold with a groove array; step S32: adjusting the processing roughness of the electric spark machine tool, and using the electric spark electrode to roughen the surface of the mold with the groove array, thereby forming a surface with a roughness greater than or equal to Ra0.6.

[0014] Optionally, in step S2, the groove array includes multiple groove structures, all of which extend along the first direction, and the multiple groove structures are spaced apart along the second direction to form a planar structure between two adjacent groove structures, and the first direction is perpendicular to the second direction.

[0015] Optionally, in step S2, the depth of the groove structure is set to be greater than or equal to 0.1 mm, the width is set to be greater than or equal to 0.2 mm, and the center distance between two adjacent groove structures is set to be greater than or equal to 1 mm.

[0016] Optionally, in step S2 , the cross-sectional shape of the groove structure in the second direction is set to be trapezoidal, and the angle between two sides of the trapezoid is 90°.

[0017] According to another aspect of the present application, a light-guiding structure is provided, which is manufactured by the above-mentioned manufacturing method of the light-guiding structure. The light-guiding structure extends along the second direction. The light-guiding structure has at least a light incident surface, a reflecting surface and a light emitting surface. The light incident surface is located on the side of the light-guiding structure and is perpendicular to the second direction. A group of opposite sides of the light incident surface are respectively connected to the reflecting surface and the light emitting surface. The reflecting surface is arranged opposite to the light emitting surface, and the reflecting surface has a protrusion array.

[0018] Optionally, the roughness of the reflective surface is greater than or equal to Ra0.6 and less than or equal to Ra0.9.

[0019] Optionally, the protrusion array includes a plurality of protrusion structures, each of the plurality of protrusion structures extends along the first direction, and two adjacent protrusion structures in the plurality of protrusion structures are spaced apart to form a straight-surface structure therebetween.

[0020] Applying the technical solution of the present application, the manufacturing method of the light-guiding structure includes steps S1 to S4, step S1: obtaining a mold of the light-guiding structure to be manufactured according to the design drawing of the light-guiding structure to be manufactured; step S2: using a chamfering cutter or a ball cutter to mill the surface of the mold to form a groove array; step S3: roughening the surface of the mold with the groove array; step S4: assembling the mold and then forming a light-guiding structure after an injection molding process, the light-guiding structure having a reflective surface, the reflective surface being formed by the surface of the mold with the groove array, the reflective surface having a roughness after roughening treatment and a protrusion array complementary to the groove array.

[0021] The present application uses ordinary tools such as chamfering cutters or ball cutters to mill the surface of the mold to form a groove array. The size and distribution of the groove array are carried out according to the design size. This arrangement avoids the use of high-cost diamond tools or collision machines for processing, which greatly saves costs. At the same time, the present application uses CNC machine tools and ordinary tools to achieve processing, which reduces the difficulty of processing and the complexity of operation, making it easier for operators to get started. Since the size of the groove array processed by ordinary tools is large, the light emitted by the light-guiding structure will appear light and dark stripes when it shines on the object, causing a large output deviation of the light-guiding structure. In order to solve this problem, the present application adopts the roughening treatment of step S3, so that the light-guiding structure manufactured after the injection molding process has a reflective surface. The reflective surface is formed by the surface of the mold with the groove array. The reflective surface has the roughness after the roughening treatment and a protrusion array complementary to the groove array, so that the manufactured light-guiding structure can eliminate light and dark stripes, improve the output deviation, and make the output light more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings that constitute part of this application are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0023] FIG1 shows a state diagram of processing a mold core using a diamond tool in the prior art;

[0024] FIG2 shows a schematic diagram of the mold core in FIG1 ;

[0025] FIG3 is a schematic diagram showing an angle of a mold core after the mold core is processed by a collision point machine in the prior art;

[0026] FIG4 shows a schematic diagram of the mold core in FIG3 from another angle;

[0027] FIG5 shows a flow chart of a method for manufacturing a light guide structure according to the first embodiment of the present application;

[0028] FIG6 shows a schematic structural diagram of a light guide structure according to an optional embodiment of the present application;

[0029] FIG7 shows a schematic diagram of the light guide structure in FIG6 from another angle;

[0030] FIG8 shows a partial enlarged view of the light guide structure in FIG6 ;

[0031] FIG9 shows a state diagram of the light guide structure during the manufacturing process of Example 1 of the present application;

[0032] FIG10 shows an output waveform diagram of a light guide structure formed without roughening treatment;

[0033] FIG11 shows a state diagram of the manufacturing method of the light guide structure of the first embodiment of the present application after step S3;

[0034] FIG12 is a schematic diagram showing an angle of a light guide structure manufactured by the method for manufacturing a light guide structure according to the first embodiment of the present application;

[0035] FIG13 shows an output waveform diagram of a light guide structure manufactured by the method for manufacturing a light guide structure according to the first embodiment of the present application;

[0036] FIG14 shows a flow chart of a method for manufacturing a light guide structure according to the second embodiment of the present application;

[0037] FIG15 shows a state diagram of a method for manufacturing a light guide structure according to the second embodiment of the present application.

[0038] The above drawings include the following reference numerals:

[0039] 1. Mold core; 2. Diamond tool; 101. V-Cut groove; 301. Circular array; 10. Mold; 11. Groove structure; 12. Plane structure; 20. Light-guiding structure; 21. Light incident surface; 22. Reflective surface; 221. Raised structure; 222. Straight-face structure; 23. Light emitting surface; 30. First direction; 40. Second direction; 50. Electric spark electrode. DETAILED DESCRIPTION

[0040] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0041] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0042] In this application, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used with reference to the directions shown in the drawings, or with reference to the components themselves in the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit this application.

[0043] As shown in Figures 1 to 4, a method for manufacturing a light-guiding structure in the prior art is described. Specifically, Figures 1 and 2 describe a state diagram of processing a mold core 1 using a diamond tool 2 in the prior art and a schematic diagram of the mold core 1 after processing. As shown in Figure 1, a V-Cut groove 101 can be processed on the surface of the mold core 1 using a diamond tool. Since the front end of the single-crystal diamond tool 2 is very small, the size of the processed V-Cut groove 101 is very small. Generally, the groove depth k≤0.1mm, the groove width m≤0.2mm, and the groove spacing e≥2 times the groove width. Figures 3 and 4 describe a schematic diagram of using a collision machine in the prior art to impact the mold core 1 to form a circular array 301. Among them, the diameter n of the spherical concave point is less than 0.2mm, the depth j≤0.1mm, and the groove spacing is greater than or equal to 2 times the diameter n. Judging from these parameters, it is difficult for ordinary CNC machine tools and tools to meet the processing size requirements and precision requirements. At the same time, these processing equipment and cutting tools are special equipment, which are relatively expensive and costly. The equipment is also complicated to operate and the process is also complicated, making it difficult to get started.

[0044] In order to solve the problems of high cost and great difficulty in operation in the manufacture of light guide structures in the prior art, the present application provides a method for manufacturing a light guide structure and a light guide structure.

[0045] As shown in Figures 5 to 15, the manufacturing method of the light-guiding structure includes steps S1 to S4, step S1: obtaining a mold 10 for the light-guiding structure to be manufactured according to the design drawing of the light-guiding structure to be manufactured; step S2: using a chamfering knife or a ball knife to mill the surface of the mold 10 to form a groove array; step S3: roughening the surface of the mold 10 with the groove array; step S4: assembling the mold 10, and then forming a light-guiding structure 20 after an injection molding process, the light-guiding structure 20 having a reflective surface 22, the reflective surface 22 being formed by the surface of the mold 10 with the groove array, the reflective surface 22 having a roughness after roughening treatment and a protrusion array complementary to the groove array.

[0046] The present application uses a common tool such as a chamfering cutter or a ball cutter to mill the surface of the mold 10 to form a groove array. The size and distribution of the groove array are set according to the design size. This setting avoids the use of high-cost diamond tools or collision machines for processing, which greatly saves costs. At the same time, the present application uses CNC machine tools and common tools to achieve processing, reducing the processing difficulty and operation complexity, making it easier for operators to get started. Since the size of the groove array processed by ordinary tools is large, the light emitted by the light-guiding structure 20 will appear light and dark stripes when it shines on the object, causing a large output deviation of the light-guiding structure 20. In order to solve this problem, the present application adopts the roughening treatment of step S3, so that the light-guiding structure 20 manufactured after the injection molding process has a reflective surface 22. The reflective surface 22 is formed by the surface of the mold 10 with the groove array. The reflective surface 22 has the roughness after the roughening treatment and a protrusion array complementary to the groove array, so that the manufactured light-guiding structure 20 can eliminate light and dark stripes, improve the output deviation, and make the output light more uniform. The purpose of this application is to use common processing and cutting tools to produce a light guide structure 20 that meets the use requirements.

[0047] It should be noted that in step S2, a chamfering cutter or a ball cutter is used to mill the surface of the mold 10 using a CNC machine tool, forming a groove array on the surface of the mold 10. This groove array complements the protrusion array of the reflective surface 22 of the final light guide structure 20 to be machined. In step S4, the machined mold 10 is assembled and then mounted on an injection molding machine. A material such as acrylic or PC is added and injection molding is performed to form the light guide structure 20 as designed.

[0048] Specifically, before step S3, the surface roughness of the groove array of the mold 10 is less than or equal to Ra0.1. After step S3, the surface roughness of the groove array of the mold 10 is greater than or equal to Ra0.6 and less than or equal to Ra0.9. This roughening treatment increases the roughness of the reflective surface 22 of the final light guide structure 20, thereby optimizing output deviation, avoiding stray light, and ensuring a focused light effect.

[0049] Specifically, the aforementioned light guide structure 20 can be in the form of a plate or a strip. In step S2, the groove array of the mold 10 includes a plurality of groove structures 11. The plurality of groove structures 11 extend along a first direction 30. The plurality of groove structures 11 are spaced apart along a second direction 40 to form a planar structure 12 between two adjacent groove structures 11. The first direction 30 is perpendicular to the second direction 40. It can also be understood that the surface of the mold 10 having the groove array is composed of alternating groove structures 11 and planar structures 12.

[0050] In step S3 , the roughening treatment includes one of sandblasting and electric spark electrode treatment.

[0051] The following describes the method for manufacturing the light guide structure of the present application in two embodiments according to the specific treatment method of the roughening treatment and in conjunction with the accompanying drawings.

[0052] Example 1

[0053] 5 to 13 , a method for manufacturing a light guide structure according to Embodiment 1 is described. FIG5 shows a flow chart of the method for manufacturing a light guide structure according to this embodiment.

[0054] In the first embodiment, the roughening treatment is sandblasting. The sandblasting treatment includes sandblasting the surface of the mold 10 having the groove array to form a surface roughness greater than or equal to Ra0.6. As a result, the roughness of the surface of the mold 10 having the groove array is greater than or equal to Ra0.6 and less than or equal to Ra0.9.

[0055] As shown in FIG6 to FIG8 , schematic diagrams of a light guide structure 20 manufactured by the method for manufacturing a light guide structure according to the first embodiment are shown.

[0056] As shown in Figure 9, it is a schematic diagram of the structure of the mold 10 and a schematic diagram of the manufactured light-guiding structure 20. As can be seen from the figure, the corresponding part of the reflective surface 22 of the light-guiding structure 20 on the mold 10 is a surface with a groove array. In step S2, the depth h' of the groove structure 11 is set to be greater than or equal to 0.1mm, the width g' is set to be greater than or equal to 0.2mm, and the center distance p between two adjacent groove structures 11 is set to be greater than or equal to 1mm. The cross-sectional shape of the groove structure 11 in the second direction 40 is set to be trapezoidal, and the angle between the two sides of the trapezoid is 90°. Of course, the specific size of the groove structure 11 can be designed according to the actual required size of the protruding structure 221 of the reflective surface 22 of the light-guiding structure 20. Since the specific size of the groove structure 11 of the present application is not too small, ordinary tools can be used to achieve processing of sizes within this range. This avoids the problem of using expensive, specialized and complex processing equipment and tools.

[0057] Specifically, when machining with conventional cutting tools, due to the large dimensions typically exceeding 0.2 mm, light emitted from the light guide structure 20 can produce light and dark streaks when irradiated onto an object. As shown in Figure 10, the waveform output by the light guide structure 20 is relatively coarse, indicating significant deviations in the light guide structure 20. To address this issue, the surface of the mold 10 with its groove array is sandblasted to increase the roughness, eliminate the light and dark streaks, and achieve a more uniform light output.

[0058] Preferably, during the sandblasting process, the sandblasting parameters are 180# silicon carbide and the sandblasting pressure is 0.6 MPa.

[0059] Figures 11 and 12 are schematic diagrams of the mold 10 and the resulting light guide structure 20 after sandblasting. Figure 13 is a waveform diagram of the output of the light guide structure 20 after sandblasting. As can be seen from the figure, the output waveform is significantly thinner, indicating that the deviation of the light guide structure 20 is significantly reduced, thereby significantly reducing the influence of the depth, width, and spacing of the structure on the output deviation.

[0060] Example 2

[0061] 14 and 15 , a method for manufacturing a light guide structure according to the second embodiment is described. FIG14 shows a flow chart of the method for manufacturing a light guide structure according to the present embodiment.

[0062] In the second embodiment, the difference from the first embodiment is that the roughening treatment is an electric spark electrode treatment. The remaining steps are the same.

[0063] Specifically, EDM electrode processing includes:

[0064] Step S31: manufacturing an EDM electrode 50 with a complementary shape based on the surface of the mold 10 having the groove array;

[0065] Step S32: adjusting the machining roughness of the EDM machine, and roughening the surface of the mold 10 having the groove array using the EDM electrode 50, thereby forming a surface with a roughness greater than or equal to Ra0.6 and less than or equal to Ra0.9.

[0066] As shown in Figure 15, current EDM machines can automatically select the desired surface roughness. Therefore, a roughness requirement of Ra0.6 to Ra0.9 can be selected for machining, achieving the desired surface roughness. This embodiment utilizes EDM technology to achieve a non-mirror surface with a roughness of Ra0.6 to Ra0.9 through parameter control, eliminating light and dark fringes and making the output light more uniform.

[0067] 6 to 8 , the present application further provides a light guide structure 20, which is manufactured by the above-mentioned method for manufacturing a light guide structure. The light guide structure 20 is strip-shaped and extends along a second direction 40. The light guide structure 20 has at least a light incident surface 21, a reflective surface 22, and a light emitting surface 23. The light incident surface 21 is located on the side of the light guide structure 20, specifically the left end in FIG6 and is perpendicular to the second direction 40. A set of opposite sides of the light incident surface 21 are respectively connected to the reflective surface 22 and the light emitting surface 23. The reflective surface 22 is arranged opposite to the light emitting surface 23. The reflective surface 22 has a protrusion array. The protrusion array includes a plurality of protrusion structures 221, which are arranged at intervals along the extension direction of the light guide structure 20. The plurality of protrusion structures 221 all extend along the first direction 30. Two adjacent protrusion structures 221 in the plurality of protrusion structures 221 are arranged at intervals to form a straight surface structure 222 therebetween. It can also be understood that the reflective surface 22 is composed of alternately arranged protruding structures 221 and straight structures 222 .

[0068] Specifically, the reflective surface 22 of the light guide structure 20 is formed by a side surface of the mold 10 having a groove array. Specifically, the protruding structure 221 and the straight surface structure 222 of the reflective surface 22 are formed by the groove structure 11 and the plane structure 12 of the mold 10 respectively.

[0069] Specifically, the roughness of the reflective surface 22 is greater than or equal to Ra0.6 and less than or equal to Ra0.9. The reflective surface 22 is an uneven surface with a certain roughness, thereby ensuring the reflection effect of the reflective surface 22, improving the final displayed light and dark stripes, and making the output light more uniform.

[0070] It should be noted that, in the specific embodiment of the present application, the light guide structure 20 is in a strip shape. Of course, in other optional embodiments, the light guide structure 20 may also be in a plate shape.

[0071] 6 , the LED chip for emitting light is located at the left end of the light guide structure 20, thereby realizing side light entry. Light incident from the light incident surface 21 enters the light guide structure 20, and then is reflected by the reflective surface 22 and emitted from the light emitting surface 23. The second direction 40 is the light incident direction.

[0072] As shown in FIG8 , the height depth h of the protruding structures 221 on the reflective surface 22 of the light guide structure 20 is ≥0.1 mm, the width g is ≥0.2 mm, and the center distance between two adjacent protruding structures 221 is greater than or equal to 1 mm.

[0073] Obviously, the embodiments described above are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0074] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0075] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0076] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A method for manufacturing a light guide structure, characterized in that: include: Step S1: obtaining a mold (10) of the light guide structure to be manufactured according to a design drawing of the light guide structure to be manufactured; Step S2: using a chamfering cutter or a ball cutter to mill the surface of the mold (10) to form a groove array; Step S3: roughening the surface of the mold (10) having the groove array; Step S4: Assembling the mold (10), and then forming a light-guiding structure (20) through an injection molding process, wherein the light-guiding structure (20) has a reflective surface (22), and the reflective surface (22) is formed by a surface of the mold (10) having a groove array, and the reflective surface (22) has a roughness after the roughening treatment and a protrusion array complementary to the groove array.

2. The method for manufacturing a light guide structure according to claim 1, characterized in that: After step S3, the roughness of the surface of the groove array of the mold (10) is greater than or equal to Ra0.6 and less than or equal to Ra0.

9.

3. The method for manufacturing a light guide structure according to claim 1, characterized in that: In the step S3, the roughening treatment includes one of sandblasting treatment and electric spark electrode treatment.

4. The method for manufacturing a light guide structure according to claim 3, characterized in that: In the step S3, the sandblasting process includes: The surface of the mold (10) having the groove array is sandblasted to form a surface with a roughness greater than or equal to Ra0.

6.

5. The method for manufacturing a light guide structure according to claim 3, characterized in that: In step S3, the electric spark electrode processing includes: Step S31: manufacturing an electric spark electrode (50) having a complementary shape to the surface of the mold (10) having a groove array; Step S32: adjusting the machining roughness of the electric spark machine tool, and using the electric spark electrode (50) to roughen the surface of the mold (10) having the groove array, thereby forming a surface with a roughness greater than or equal to Ra0.

6.

6. The method for manufacturing a light guide structure according to claim 1, characterized in that: In step S2, the groove array includes a plurality of groove structures (11), the plurality of groove structures (11) all extend along a first direction (30), and the plurality of groove structures (11) are spaced apart along a second direction (40) to form a planar structure (12) between two adjacent groove structures (11), and the first direction (30) is perpendicular to the second direction (40).

7. The method for manufacturing a light guide structure according to claim 6, characterized in that: In step S2, The depth of the groove structure (11) is set to be greater than or equal to 0.1 mm, and the width is set to be greater than or equal to 0.2 mm, and the center distance between two adjacent groove structures (11) is set to be greater than or equal to 1 mm.

8. The method for manufacturing a light guide structure according to claim 6, characterized in that: In step S2, The cross-sectional shape of the groove structure (11) in the second direction (40) is set to be a trapezoid, and the angle between the two sides of the trapezoid is 90°.

9. A light guide structure, characterized in that: The light-guiding structure is manufactured by the manufacturing method of the light-guiding structure according to any one of claims 1 to 8, the light-guiding structure (20) extends along the second direction (40), the light-guiding structure (20) has at least a light incident surface (21), a reflection surface (22) and a light emitting surface (23), the light incident surface (21) is located on the side of the light-guiding structure (20) and is perpendicular to the second direction (40), a group of opposite sides of the light incident surface (21) are respectively connected to the reflection surface (22) and the light emitting surface (23), the reflection surface (22) is arranged opposite to the light emitting surface (23), and the reflection surface (22) has a protrusion array.

10. The light guide structure according to claim 9, characterized in that: The roughness of the reflecting surface (22) is greater than or equal to Ra0.6 and less than or equal to Ra0.

9.

11. The light guide structure according to claim 9, characterized in that: The protrusion array comprises a plurality of protrusion structures (221), the plurality of protrusion structures (221) all extend along a first direction (30), and two adjacent protrusion structures (221) among the plurality of protrusion structures (221) are arranged at intervals to form a straight surface structure (222) therebetween.

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