CN102343480A - Laser processing device and method for manufacturing light guide plate - Google Patents

Abstract

The invention relates to a laser processing device, which is used for processing a processing surface of a substrate. The laser processing device comprises a first laser light source module and a second laser light source module of which the positions are relatively fixed, and a light combining component which has two reflecting surfaces back to back and can move relative to the first laser light source module and the second laser light source module. The first laser light source module emits first laser beams and the first laser beams reach one reflecting surface of the light combining component to form a first light path. The second laser light source module emits second laser beams and the second laser beams reach the other reflecting surface of the light combining component to form a second light path. When the light combining component moves, the sum of the first light path and the second light path is kept constant. The light combining component reflects and combines the first laser beams and the second laser beams to form third laser beams, and guides the third laser beams to be focused to the processing surface of the substrate. The invention also relates to a method for manufacturing a light guide plate.

Description

Laser processing device and light guide plate manufacturing method

technical field

The invention relates to the field of dot processing, in particular to a laser processing device and a method for manufacturing a light guide plate.

Background technique

The light guide plate is one of the key parts in the backlight module. In order to meet the market demand for light uniformity of the light guide plate, the bottom surface of the light guide plate is usually provided with multiple dots. The multiple dots are used to destroy the total reflection of the light beam transmitted inside the light guide plate. Conditions, and the light beam is scattered to improve the uniformity of the light emitted by the light guide plate, thereby improving the overall performance of the backlight module.

At present, the manufacturing method of the dots of the light guide plate mainly includes the printing method. The printing method is to manually print the dots on the hard transparent acrylic board, which not only consumes a lot of labor costs, but also the printing quality is not easy to control, such as uneven printing caused by too much or too little ink, and the ink pattern is destroyed by human touch, etc. Moreover, the ink absorbs light, reducing luminous efficiency. In order to solve the above problems, designers began to use the laser method to process the dots on the light guide plate. The laser method uses the laser beam emitted by the laser light source to reach the laser head after passing through a certain optical path, and then the laser head shoots out the dots directly on the substrate. To form a light guide plate or form a mold core, and then shape the light guide plate by the mold core. In this way, the disadvantages of printing dots can be overcome.

However, when using the laser method to process dots, the laser head moves relative to the substrate to process dots at different positions on the substrate. At this time, the optical path of the laser beam from the laser light source to the laser head will change. , the stronger the energy attenuation of the laser beam, the shorter the optical path, and the weaker the energy attenuation of the laser beam. Therefore, the energy of the laser beam hitting the substrate will be different when the laser head is in different positions, which leads to the processing of different positions on the substrate. The size and depth of the dots are inconsistent.

Contents of the invention

In view of this, it is necessary to provide a laser processing device and a light guide plate manufacturing method, which can ensure that the energy of the laser beam is kept as constant as possible when processing dots at different positions, so as to avoid inconsistency in the size or depth of the dots processed.

A laser processing device is used for processing on a processing surface of a substrate. The laser processing device includes a first laser light source module, a second laser light source module and a light combining assembly with two opposite reflective surfaces. The first laser light source module is used to emit a first laser beam and reach one of the two reflective surfaces of the light combining assembly to form a first light path. The second laser light source module is used to emit a second laser beam and reach the other reflective surface of the two reflective surfaces of the light combining assembly to form a second light path. The first laser light source module and the second laser light source module are relatively fixed in position, and the light combining assembly is movable relative to the first laser light source and the second laser light source. The sum of the distance of the first light path and the distance of the second light path remains constant when the light-combining assembly moves. The light combination component is used to reflect and combine the first laser beam and the second laser beam to form a third laser beam and guide the third laser beam to focus on the processing surface of the substrate.

A method for manufacturing a light guide plate, comprising the following steps: providing a substrate including a processing surface; providing a laser processing device, using the laser processing device to form dots on the processing surface of the substrate to form a mold core; The laser processing device includes a first laser light source module, a second laser light source module and a light combination assembly with two opposite reflective surfaces, the first laser light source module is used to emit the first laser beam and reach the combination One of the two reflective surfaces of the optical component forms a first optical path, and the second laser light source module is used to emit a second laser beam and reach the other reflective surface of the two reflective surfaces of the light combining component to form a The second optical path, the position of the first laser light source module and the second laser light source module is relatively fixed, the light combination assembly can move relative to the first laser light source and the second laser light source, the first light path when the light combination assembly moves The sum of the distance and the distance of the second optical path is kept constant, and the light combination component is used to reflect and combine the first laser beam and the second laser beam to form a third laser beam and guide the third laser beam to focus on the substrate Dots are formed on the processed surface; a light guide plate is formed by using the mold core.

A method for manufacturing a light guide plate, comprising the following steps: providing a substrate including a processing surface; providing a metal foil; pasting the metal foil on the processing surface of the substrate; providing a laser processing device, using the laser processing The device breaks through the metal foil to form dots on the processing surface of the substrate, and tears off the metal foil to form a mold core; the laser processing device includes a first laser light source module, a second laser light source module and one with two The light-combining component of the opposite reflective surface, the first laser light source module is used to emit the first laser beam and reach one of the two reflective surfaces of the light-combining component to form a first optical path, and the second laser beam The light source module is used to emit the second laser beam and reach the other of the two reflective surfaces of the light combination assembly to form a second optical path. The position of the first laser light source module and the second laser light source module is relatively fixed. The light-combining assembly can move relative to the first laser light source and the second laser light source. When the light-combining assembly moves, the sum of the first optical path and the second optical path remains constant. The light-combining assembly is used to reflect and combine the The first laser beam and the second laser beam are used to form a third laser beam, and the third laser beam is guided to focus on the processing surface of the substrate to form dots; the mold core is used to form a light guide plate.

Compared with the prior art, the laser processing device and the light guide plate manufacturing method adopt the first laser beam and the second laser beam and move the light-combining component to process dots on the processing surface, because the light-combining component moves along the substrate During the process, the sum of the distance of the first optical path and the distance of the second optical path is kept constant, and when the movement of the light-combining assembly causes the distance of the first optical path to increase, and the energy attenuation of the first laser beam reaching the light-combining assembly increases, the distance of the second optical path will be shortened , the energy attenuation of the second laser beam reaching the light-combining component is correspondingly reduced, and vice versa, so that the energy of the first laser beam on the first optical path and the energy of the second laser beam on the second optical path can complement each other to ensure the combination of light The energy of the third laser beam striking the substrate at different positions of the component is kept as constant as possible to avoid inconsistency in the size and depth of dots processed at different positions on the processing surface of the substrate.

Description of drawings

FIG. 1 is a schematic diagram of a laser processing device according to a first embodiment of the present invention forming halftone dots on a processing surface of a substrate.

FIG. 2 is a schematic plan view of the substrate in FIG. 1 after dots are formed.

Fig. 3 is a schematic diagram of a laser processing apparatus according to a second embodiment of the present invention.

FIG. 4 is a flowchart of a manufacturing method of a light guide plate according to a third embodiment of the present invention.

FIG. 5 is a flowchart of a method for manufacturing a light guide plate according to a fourth embodiment of the present invention. Description of main component symbols

Substrate 10, 30

Processing surface 102, 302

First Side 104

Second Side 106

Laser processing device 20, 40

The first laser light source module 201

The second laser light source module 211

The first laser light source 202

The first filter element 204

The first concentrating element 206

First reflection element 208

Second reflective element 210

Second laser light source 212

Second filter element 214

The second concentrating element 216

The third reflective element 218

Fourth reflective element 220

The third concentrating element 222

The fourth concentrating element 224

Synthetic components 226, 426

Reflection unit 2262

Concentrating unit 2264, 4266

First reflective surface 2266, 4263

Second reflective surface 2268, 4265

First reflection unit 4262

Second reflection unit 4264

Detailed ways

Various embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Please refer to FIG. 1 and FIG. 2 , which illustrate a laser processing device 20 according to a first embodiment of the present invention, which is used to form dots on a substrate 10 .

The substrate 10 includes a processing surface 102 opposite to the laser processing device 20 . The dots formed by the laser processing device 20 are located on the processing surface 102 . The processing surface 102 is rectangular and includes two parallel first sides 104 and two parallel second sides 106 .

The laser processing device 20 includes a first laser light source 202, a first filter element 204, a first light concentrating element 206, a first reflective element 208, a second reflective element 210, a second laser light source 212, A second filter element 214, a second light-condensing element 216, a third reflective element 218, a fourth reflective element 220, a third light-condensing element 222, a fourth light-condensing element 224, and a light-combining assembly 226. Wherein, the first laser light source 202, the first filter element 204, the first light concentrating element 206, the first reflective element 208, the second reflective element 210 and the third light concentrating element 222 form a first Laser light source module 201. The second laser light source 212, the second filter element 214, the second light concentrating element 216, the third reflective element 218, the fourth reflective element 220 and the fourth light concentrating element 224 form a second laser light source Module 211.

The first laser light source 202 is used to emit a first laser beam. The first filter element 204 is located between the first laser light source 202 and the first light concentrating element 206 , and the first filter element 204 is used to remove the weaker energy part of the first laser beam. The first light concentrating element 206 is located between the first filter element 204 and the first reflective element 208 , and the first light concentrating element 206 is used to condense the first laser beam to make it more concentrated. The first reflective element 208 is used to reflect the first laser beam converged by the first light concentrating element 206 onto the second reflective element 210 . The second reflective element 210 is used for reflecting the first laser beam reflected by the first reflective element 208 to the third light concentrating element 222 . The third light concentrating element 222 is located between the second reflective element 210 and the light combination assembly 226 . The first laser beam emitted by the first laser light source 202 passes through the first optical filter element 204 and the first light concentrating element 206, and is reflected by the first reflective element 208 and the second reflective element 210 in sequence, and is reflected by the first reflective element 208 and the second reflective element 210. The first laser beam reflected by the two reflective elements 210 is converged by the third light concentrating element 222 and finally arrives at the light combining assembly 226 to form a first light path.

The second laser light source 212 is used to emit a second laser beam, and the positions of the first laser light source 202 and the second laser light source 212 are relatively fixed. The second filter element 214 is located between the second laser light source 212 and the second light concentrating element 216 , and the second filter element 214 is used to remove the weaker energy part of the second laser beam. The second light concentrating element 216 is located between the second filter element 214 and the third reflective element 218 , and the second light concentrating element 216 is used for converging the second laser beam to make it more concentrated. The third reflective element 218 is used for reflecting the second laser beam converged by the second light concentrating element 216 onto the fourth reflective element 220 . The fourth reflective element 220 is used for reflecting the second laser beam reflected by the third reflective element 218 to the fourth light concentrating element 224 . The fourth light concentrating element 224 is located between the fourth reflective element 220 and the light combination assembly 226 . The second laser beam emitted by the second laser light source 212 passes through the second filter element 214 and the second light concentrating element 216, and is reflected by the third reflective element 218 and the fourth reflective element 220 in sequence, and is reflected by the first reflective element 218 and the fourth reflective element 220. The second laser beam reflected by the four reflective elements 220 is converged by the fourth light concentrating element 224 and finally arrives at the light combination assembly 226 to form a second light path. The second optical path and the first optical path do not interfere with each other, that is, they are independent of each other.

The light combination component 226 is movably disposed between the first laser light source 202 and the second laser light source 212 , and the sum of the first light path distance and the second light path distance remains constant when the light combination component 226 moves. The light combination unit 226 includes a reflection unit 2262 and a light collection unit 2264 . The reflective unit 2262 has a triangular cross section and includes a first reflective surface 2266 and a second reflective surface 2268 . The first reflective surface 2266 and the second reflective surface 2268 are obliquely connected and symmetrical two sides. In this embodiment, the first laser beam reaches the first reflective surface 2266, the second laser beam reaches the second reflective surface 2268, and the first laser beam and the second laser beam respectively reach the first reflective surface 2266 and the incident angle of the second reflective surface 2268 are equal. The focusing unit 2264 is a convex lens. In this embodiment, the focal point of the convex lens just falls on the processing surface 102 of the substrate 10 .

In this embodiment, the first filter element 204 and the second filter element 214 are all filters; The fourth condensing element 224 is a condensing lens; the first reflective element 208 , the second reflective element 210 , the third reflective element 218 and the fourth reflective element 220 are reflective mirrors.

When the laser processing device 20 is used to form dots on the processing surface 102 of the substrate 10, the first laser beam and the second laser beam are respectively reflected by the first reflective surface 2266 and the second reflective surface 2268 and enter the The condensing unit 2264 forms a plurality of third laser beams, and the condensing unit 2264 guides the plurality of third laser beams to focus on a point on the processing surface 102 to form a dot on the point on the processing surface 102 . Moving the light-combining assembly 226 along the direction of the first side 104 (X-axis positive direction) and operating the laser processing device 20 at intervals can process the first row of dots on the processing surface 102, and then, along the second Move the laser processing device 20 as a whole in the direction of the side 106 (Y-axis positive direction), and then move the light-combining assembly 226 along the opposite direction of the first side 104 (X-axis negative direction) and operate the laser processing device 20 at intervals. A second row of dots is processed on the processing surface 102, and the second row of dots is parallel to and spaced apart from the first row of dots. By analogy, the laser processing device 20 can process dots on the entire processing surface 102 (as shown in FIG. 2 ).

The laser processing device 20 of this embodiment adopts the first laser beam and the second laser beam and moves the light-combining assembly 226 to process dots on the processing surface 102, because the first optical path of the light-combining assembly 226 moves along the substrate 10 If the sum of the distance and the second optical path distance remains constant, then when the light combining assembly 226 moves and causes the first optical path distance to increase, and the energy attenuation of the first laser beam reaching the light combining assembly 226 increases, the second optical path distance will be shortened to reach the combined laser beam. The energy attenuation of the second laser beam of the light assembly 226 is correspondingly reduced. On the contrary, when the movement of the light combining assembly 226 causes the distance of the second optical path to increase, and the energy attenuation of the second laser beam reaching the light combining assembly 226 increases, the distance of the first optical path will be shortened, and the energy of the first laser beam arriving at the light combining assembly 226 will The attenuation is correspondingly reduced, so that the energy of the first laser beam on the first optical path and the energy of the second laser beam on the second optical path can complement each other to ensure that the third laser beam striking the substrate 10 when the light-combining component 226 is in a different position The energy of the beam is kept as constant as possible to avoid inconsistency in the size and depth of dots processed at different positions on the processing surface 102 of the substrate 10 .

It can be understood that the shape of the substrate 10 is not limited to the rectangle in this embodiment, and may also be circular, triangular and other shapes. In addition, the first light filter element 204 , the second light filter element 214 , the third light focus element 222 and the fourth light focus element 224 can all be omitted.

It can be understood that the laser processing device 20 may also only include the first laser light source 202 , the second laser light source 212 and the light combination assembly 226 . The light combining assembly 226 is movably arranged between the first laser light source 202 and the second laser light source 212, and the first laser beam emitted by the first laser light source 202 directly reaches the light combining assembly 226, and the second laser beam The second laser beam emitted by the light source 212 directly reaches the light combination assembly 226 . The light combination component 226 combines the first laser beam and the second laser beam to form a third laser beam and guides the third laser beam to focus on the processing surface 102 to form dots.

Please refer to FIG. 3 , which is a laser processing device 40 according to a second embodiment of the present invention, which is used to form dots on the processing surface 302 of the substrate 30 .

The difference between the laser processing device 40 in this embodiment and the laser processing device 20 in the first embodiment is that the light combination assembly 426 includes a first reflection unit 4262 , a second reflection unit 4264 and a light concentrating unit 4266 . The first reflection unit 4262 includes a first reflection surface 4263 . The second reflection unit 4264 includes a second reflection surface 4265 . The first reflective surface 4263 is inclined relative to the second reflective surface 4265 , and the first reflective surface 4263 and the second reflective surface 4265 are two symmetrical sides of the light combination assembly 426 . The light focusing unit 4266 is a convex lens, and the focal point of the convex lens is located on the processing surface 302 of the substrate 30 . The first laser beam and the second laser beam are respectively reflected by the first reflective surface 4263 and the second reflective surface 4265 and enter the light concentrating unit 4266 in parallel to form a plurality of third laser beams, and the light concentrating unit 4266 guides The plurality of third laser beams are directed to a point on the processing surface 302 of the substrate 30 to form dots at the point. The beneficial effect of the laser processing device 40 in this embodiment is the same as that of the laser processing device 20 in the first embodiment.

Please refer to FIG. 4 , which is a flow chart of the manufacturing method of the light guide plate according to the third embodiment. Please combine Figure 1 and Figure 2, the light guide plate manufacturing method includes the following steps:

S102: Provide a substrate 10 . The substrate 10 includes a processing surface 102, and the substrate 10 can be made of metal or acrylic material.

S104: providing a laser processing device 20, using the laser processing device 20 to form dots on the processing surface 102 of the substrate 10 to form a mold core. However, this laser processing device 20 is the laser processing device in the first embodiment. Specifically, the first laser beam and the second laser beam are respectively reflected by the first reflective surface 2266 and the second reflective surface 2268 and enter the light concentrating unit 2264 in parallel to form a plurality of third laser beams, and the concentrating The unit 2264 guides the plurality of third laser beams to focus on a point on the processing surface 102 to form a dot on the point on the processing surface 102 . Please refer to FIG. 2, move the light-combining assembly 226 along the direction of the first side 104 (the positive direction of the X-axis) and operate the laser processing device 20 at intervals to process the first row of dots on the processing surface 102, and then After moving the laser processing device 20 as a whole along the direction of the second side 106 (Y-axis positive direction), then move the light-combining assembly 226 along the opposite direction of the first side 104 (X-axis negative direction) and operate the The laser processing device 20 can process a second row of dots on the processing surface 102 , and the second row of dots is parallel to and spaced apart from the first row of dots. By analogy, the laser processing device 20 can process dots on the entire processing surface 102 .

S106: Using the mold core to form a light guide plate. This step belongs to the prior art and will not be described in detail here.

It can be understood that the manufacturing method of the light guide plate is not limited to the use of the laser processing device 20 in the first embodiment in this embodiment, and the laser processing device 40 in the second embodiment can also be used. In addition, the substrate 10 can be a light guide plate, and the dots are processed on the processed surface 102 of the substrate 10 to obtain a finished light guide plate, so that the step of forming the light guide plate by using a mold core can be omitted.

The light guide plate manufacturing device utilizes the laser processing device 20 to adopt the first laser beam and the second laser beam and move the light combination assembly 226 to process dots on the processing surface 102. Since the light combination assembly 226 moves along the substrate 10 during the first The sum of the first optical path distance and the second optical path distance remains constant, then when the light combining assembly 226 moves to cause the first optical path distance to increase, and when the energy attenuation of the first laser beam reaching the light combining assembly 226 increases, the second optical path distance will be shortened, The energy attenuation of the second laser beam reaching the light combining assembly 226 is correspondingly reduced. On the contrary, when the movement of the light combining assembly 226 causes the distance of the second optical path to increase, and the energy attenuation of the second laser beam reaching the light combining assembly 226 increases, the distance of the first optical path will be shortened, and the energy of the first laser beam arriving at the light combining assembly 226 will The attenuation is correspondingly reduced, so that the energy of the first laser beam on the first optical path and the energy of the second laser beam on the second optical path can complement each other to ensure that the third laser beam striking the substrate 10 when the light-combining component 226 is in a different position The energy of the beam is kept as constant as possible to avoid inconsistency in the size and depth of dots processed at different positions on the processing surface 102 of the substrate 10 .

Please refer to FIG. 5 , which is a flowchart of a method for manufacturing a light guide plate according to a fourth embodiment. Please combine Figure 1 and Figure 2, the light guide plate manufacturing method includes the following steps:

S202: Provide a substrate 10 . The substrate 10 includes a processing surface 102, and the substrate 10 can be made of metal or acrylic material.

S204: Provide a metal foil (not shown).

S206 : Paste the metal foil on the processed surface 102 of the substrate 10 .

S208: Provide a laser processing device 20, use the laser processing device 20 to break through the metal foil to form dots on the processing surface 102 of the substrate 10, and tear off the metal foil to form a mold core. However, this laser processing device 20 is the laser processing device in the first embodiment. The specific steps for the laser processing device 20 to form dots on the processing surface 102 of the substrate 10 are the same as the steps for the laser processing device to form dots on the processing surface 102 of the substrate 10 in the third embodiment.

S210: Using the mold core to form a light guide plate.

The light guide plate manufacturing method of the fourth embodiment has similar beneficial effects to the light guide plate manufacturing method of the third embodiment. Furthermore, the light guide plate manufacturing method of the fourth embodiment uses a metal foil of a specific thickness to cover the processed surface of the substrate, and then Use the laser processing device to break through the metal foil to process the dots on the processing surface of the substrate. The metal foil can block the energy at the center and edge of the laser beam, so that the shape of the dots is more accurate. The dots of the light guide plate are more in line with the optical design because they are protected by metal foil.

It can be understood that those skilled in the art can make various other corresponding changes and modifications according to the technical concept of the present invention, and all these changes and modifications should belong to the protection scope of the claims of the present invention.

Claims (10)

1. A laser processing device, which is used for processing on a processing surface of a substrate, is characterized in that: the laser processing device includes a first laser light source module, a second laser light source module and a The light combination component of the reflective surface, the first laser light source module is used to emit the first laser beam and reaches one of the two reflective surfaces to form a first optical path, and the second laser light source module is used to emit the second laser beam and reach the other reflective surface of the two reflective surfaces to form a second optical path, the first laser light source module and the second laser light source module are relatively fixed in position, and the light combining assembly is relatively fixed to the first laser light source and the second laser light source The light source can be moved, and the sum of the first optical path distance and the second optical path distance remains constant when the light combining component moves, and the light combining component is used to reflect and combine the first laser beam and the second laser beam to form a third and guiding the third laser beam to focus on the processing surface of the substrate. 2 . The laser processing device according to claim 1 , wherein the two reflective surfaces are symmetrical to each other, and the incident angles of the first laser beam and the second laser beam reaching the two reflective surfaces are equal. 3 . 3. The laser processing device according to claim 2, wherein the first laser light source module comprises a first laser light source, a first light concentrating element, a first reflective element and a second reflective element, the The first laser beam emitted by the first laser light source passes through the first light concentrating element and is reflected by the first reflective element and the second reflective element in turn to reach one of the two reflective surfaces. 4. The laser processing device according to claim 3, wherein the second laser light source module comprises a second laser light source, a second light concentrating element, a third reflective element and a fourth reflective element, the The second laser beam emitted by the second laser light source passes through the second light concentrating element and is sequentially reflected by the third reflective element and the fourth reflective element to reach the other reflective surface of the two reflective surfaces. 5. The laser processing device according to claim 4, wherein the first laser light source module also includes a first filter element, the second laser light source module also includes a second filter element, the first The filter element is located between the first laser light source and the first condensing element, the first laser beam passes through the first filter element and reaches the first condensing element, and the second filter element is located at the first condensing element Between the two laser light sources and the second light concentrating element, the second laser beam passes through the second filter element and reaches the second light concentrating element. 6. The laser processing device according to claim 5, characterized in that, the first laser light source module also includes a third light concentrating element, the second laser light source module also includes a fourth light concentrating element, the third The light-condensing element is located between the second reflective element and the light-combining assembly. The first laser beam is reflected by the second reflective element and converged by the third light-condensing element to reach the light-combining assembly. The fourth light-condensing The element is located between the fourth reflective element and the light-combining assembly, and the second laser beam is reflected by the fourth reflective element and converged by the fourth light-condensing element to reach the light-combining assembly. 7. The laser processing device as claimed in claim 2, wherein the light-combining assembly includes a reflection unit and a light-condensing unit, and the reflection unit includes a first reflection surface and an oblique connection with the first reflection surface. The second reflection surface, the first reflection surface and the second reflection surface are two reflection surfaces symmetrical to the reflection unit, the light concentrating unit is a convex lens, and the focal point of the convex lens is located on the processing surface of the substrate, The first laser beam and the second laser beam are respectively reflected by the first reflective surface and the second reflective surface and enter the light concentrating unit in parallel to form the third laser beam, and the light concentrating unit guides the third laser beam The beam is focused onto the processing surface of the substrate. 8. The laser processing device according to claim 2, wherein the light combining assembly comprises a first reflection unit, a second reflection unit and a light concentrating unit, and the first reflection unit comprises a first reflection surface , the second reflective unit includes a second reflective surface, the first reflective surface is inclined relative to the second reflective surface, and the first reflective surface and the second reflective surface are two symmetrical reflective surfaces of the light combining assembly , the condensing unit is a convex lens, and the focal point of the convex lens is located on the processing surface of the substrate, the first laser beam and the second laser beam are respectively reflected by the first reflective surface and the second reflective surface and enter the The light focusing unit forms the third laser beam, and the light focusing unit guides the third laser beam to focus on the processing surface of the substrate. 9. A method of manufacturing a light guide plate, comprising: providing a substrate comprising a processed surface; Provide a laser processing device, use the laser processing device to form dots on the processing surface of the substrate to form a mold core; the laser processing device includes a first laser light source module, a second laser light source module and a module with two The light-combining components of the opposite reflective surfaces, the first laser light source module is used to emit the first laser beam and reach one of the two reflective surfaces to form a first optical path, and the second laser light source module is used to emit The second laser beam reaches the other reflective surface of the two reflective surfaces to form a second optical path, the position of the first laser light source module and the second laser light source module are relatively fixed, and the light combining assembly is relatively fixed to the first laser light source and the second laser light source module. The second laser light source can be moved, and the sum of the first optical path distance and the second optical path distance remains constant when the light combining assembly is moved, and the light combining assembly is used to reflect and combine the first laser beam and the second laser beam forming a third laser beam and directing the third laser beam to focus on the processing surface of the substrate to form dots; and The mold core is used to form a light guide plate. 10. A method of manufacturing a light guide plate, comprising: providing a substrate comprising a processed surface; Provide a metal foil; pasting the metal foil on the processing surface of the substrate; Provide a laser processing device, use the laser processing device to break through the metal foil to form dots on the processing surface of the substrate, tear off the metal foil to form a mold core; the laser processing device includes a first laser light source module, a The second laser light source module and a light-combining assembly with two opposite reflective surfaces, the first laser light source module is used to emit the first laser beam and reach one of the two reflective surfaces to form a first optical path , the second laser light source module is used to emit a second laser beam and reach the other reflective surface of the two reflective surfaces to form a second optical path, the first laser light source module and the second laser light source module are relatively fixed in position, the The light-combining assembly can move relative to the first laser light source and the second laser light source. When the light-combining assembly moves, the sum of the first optical path and the second optical path remains constant. The light-combining assembly is used to reflect and combine the The first laser beam and the second laser beam are used to form a third laser beam and guide the third laser beam to focus on the processing surface of the substrate to form dots; and The mold core is used to form a light guide plate.

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