CN103381522A - Optical system for processing laser dots - Google Patents

Abstract

The invention relates to an optical system for laser dot processing, which includes a laser light source, a polarization beam splitter facing the laser light source, a first reflection unit and a second reflection unit. The laser light source is used to emit laser light with a polarization direction. The beam splitting axis of the polarization beam splitter is 45 degrees different from the polarization direction of the laser light, and is used to split the laser light into a beam of transmitted light and a beam of reflected light with equal energy. The first reflecting unit is used for receiving the reflected light and reflecting the reflected light to a first predetermined position of the workpiece to be processed. The second reflecting unit is used for receiving the transmitted light and reflecting the transmitted light to a second predetermined position of the workpiece to be processed.

Description

Optical system for laser dot processing

technical field

The invention relates to laser dot processing, in particular to an optical system for laser dot processing.

Background technique

Using laser-processed metal steel plates as dot distribution mold blocks, such as dot distribution mold blocks for light guide plate injection molding, is an alternative to wet etching processes. Its advantages can reduce the instability of etching and reduce the problem of chemical waste. However, the length of the processing time increases with the larger the size of the light guide plate and the more the number of dots, which will lead to longer processing time and lower production rate.

When laser processing dots, the dot scanning method is often used, that is, the coordinate position of the dot distribution is first divided into many small blocks. When the laser moves to the center of a certain block, the dot processing in this block is fixed by the laser. However, there will be a scanning optical system that guides the laser light to each position given by the coordinate position file of the dot distribution, and this scanning system usually has a mirror scanning method. Therefore, when the number of dots increases, the number of scans that must be scanned increases and the processing time is also lengthened.

Contents of the invention

In view of this, it is necessary to provide an optical system for laser dot processing, which can shorten the time for dot processing.

An optical system for laser dot processing, which includes a laser light source, a polarization beam splitter facing the laser light source, a first reflection unit and a second reflection unit. The laser light source is used to emit laser light with a polarization direction. The beam splitting axis of the polarization beam splitter is 45 degrees different from the polarization direction of the laser light, and is used to split the laser light into a beam of transmitted light and a beam of reflected light with equal energy. The first reflecting unit is used for receiving the reflected light and reflecting the reflected light to a first predetermined position of the workpiece to be processed. The second reflecting unit is used for receiving the transmitted light and reflecting the transmitted light to a second predetermined position of the workpiece to be processed.

Compared with the prior art, the optical system for laser dot processing provided by the present invention uses a polarization beam splitter to divide the incident laser light into multiple beams, and then uses the reflection unit to simultaneously guide the multiple laser beams to different positions that require laser dot processing In this way, the time for dot processing is shortened.

Description of drawings

FIG. 1 is a schematic diagram of an optical system for laser dot processing provided by an embodiment of the present invention for processing a workpiece to be processed.

Fig. 2 is a schematic diagram of the relative position and optical path of the polarized beam splitter and the laser provided by the embodiment of the present invention.

Description of main component symbols

Optical system for laser dot processing 100 Laser light source 10 polarization beam splitter 20 first fixed mirror 30 first rotating mirror 40 second fixed mirror 50 third fixed mirror 60 second rotating mirror 70 Workpiece 200 Rotary mechanism 42, 72

The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings.

Detailed ways

Please refer to Fig. 1 and Fig. 2 together, the embodiment of the present invention provides a kind of optical system 100 of laser dot processing, and it comprises a laser light source 10, a polarization beam splitter 20, a first fixed mirror 30, a first A rotating mirror 40 , a second fixed mirror 50 , a third fixed mirror 60 , and a second rotating mirror 70 .

The laser light source 10 is used to emit laser light P with a polarized direction S. The laser light source 10 only needs to install a polarizer or other polarization devices in the optical resonant cavity of its laser tube, so that the output laser P can vibrate in a desired direction, that is, have a polarization direction. The polarization direction S represents the energy direction of the laser light P. The wavelength and energy of the laser P can be determined according to the size and depth of dots to be processed.

The polarized beamsplitter 20 faces the laser light source 10, and a coordinate system is established with the polarized beamsplitter 20. The beam splitting axis E of the polarized beamsplitter 20 and the polarization direction S of the laser P have a 45-degree clip angle theta. The component of the laser P on the X axis in the horizontal direction of the coordinate system will pass through the polarized beam splitter 20 to become a transmitted light P ₁ , and the component of the laser P on the Y axis in the vertical direction will be transmitted by the polarized beam splitter 20 is reflected as a reflected light P ₂ . Assuming that the energy of the incident laser light P is I, the energy of the transmitted light P ₁ and the reflected light P ₂ are respectively I×cos(θ) ² and I×sin(θ) ² , the angle θ of 45 degrees makes the transmitted Light P ₁ and reflected light P ₂ have the same energy, that is, both are 0.5I.

The first fixed mirror 30 and the first rotating mirror 40 form a first reflection unit for receiving the reflected light P ₂ and reflecting the reflected light P ₂ to a first predetermined position of the workpiece to be processed. Specifically, the first fixed reflector 30 is fixedly disposed on the optical path of the reflected light reflected from the polarized beam splitter 20 for receiving and reflecting the reflected light P ₂ reflected from the polarized beam splitter 20 . The first rotating reflector 40 is used to receive the reflected light reflected from the first fixed reflector 30 and rotate and reflect it to a first predetermined position of the workpiece 200 to be processed by laser dots.

The second fixed mirror 50, the third fixed mirror 60 _and the second rotating mirror 70 form a second reflection unit for receiving the transmitted light P1 and reflecting the transmitted light _P1 to the to-be-processed The second predetermined position of the piece 200.

The second fixed mirror 50 is fixedly disposed on the optical path of the transmitted light transmitted from the polarized beam splitter 20 for receiving and reflecting the transmitted light P ₁ transmitted from the polarized beam splitter 20 . The second fixed reflector 50 can be fixedly arranged on a movable mechanism, so that the distance between the second fixed reflector 50 and the polarization beam splitter 20 can be adjusted. The adjustment of the spacing facilitates the processing of different positions of the workpiece 200 to be processed by laser dots.

The third fixed reflector 60 is fixedly arranged on the reflected light path reflected from the second fixed reflector 50 , and is used for receiving the reflected light reflected from the second fixed reflector 50 and reflecting it out.

The second rotating mirror 70 is used for receiving the reflected light reflected from the third fixed mirror 60 and rotating and reflecting it to a second predetermined position of the workpiece 200 to be processed.

The first fixed reflector 30 and the third fixed reflector 60 are located on the same horizontal line opposite to each other. The first rotating mirror 40 and the second rotating mirror 70 are located on the same horizontal line, that is, the distance from the workpiece 200 to be processed by laser dots is at the same height, so that the two beams of laser light separated by the polarizing beam splitter 20 can be processed to a size And dot 201 with the same depth. In this embodiment, the dots 201 are sunken round dots.

The first rotating mirror 40 and the second rotating mirror 70 can be respectively arranged on a rotating mechanism 42, 72.

It can be understood that the above-mentioned second reflecting unit may only need a rotating reflector instead of a fixed reflector to rotatably reflect the transmitted light P ₁ to the second predetermined position of the workpiece 200 to be processed.

In addition, the transmitted light P ₁ and the reflected light P ₂ can be further equally divided by setting more polarized beam splitters, so that more laser beams can be used to process the workpiece 200 to be processed at the same time, and the time for dot processing can be further shortened.

The above-mentioned optical system 100 for laser dot processing uses a polarization beam splitter to divide the incident laser light into multiple laser beams, and then uses the combination of a fixed mirror and a rotating mirror to guide the laser to the position where laser dot processing is required, thus shortening the dot length. At least half of the processing time.

It can be understood that those skilled in the art can also make other changes within the spirit of the present invention, which should be included within the scope of the present invention.

Claims (9)

1. the optical system of a laser site processing, it comprises:

One LASER Light Source is used for sending the laser with a polarised direction;

The one polarization spectroscope in the face of this LASER Light Source; The polarised direction of spectroscopical minute optical axis of this polarization and this laser differs 45 degree, is used for this laser is divided into through Beam and a branch of reverberation that energy equates;

One first reflector element is used for receiving this reverberation and this reverberation being reflexed to first precalculated position of to be processed; And

One second reflector element is used for receiving this transmitted light and this transmitted light being reflexed to this second precalculated position of to be processed.

2. the optical system of laser as claimed in claim 1 site processing, it is characterized in that: this first reflector element comprises one first stationary mirror and one first rotating mirror, this first stationary mirror receives this reverberation and this reverberation is reflexed to this first rotating mirror, this first rotating mirror with this reverberation rotary reflection to this this first precalculated position of to be processed.

3. the optical system of laser as claimed in claim 2 site processing, it is characterized in that: this second reflector element comprises one second stationary mirror, one the 3rd stationary mirror and one second rotating mirror, this second stationary mirror receives this transmitted light and this transmitted light is reflexed to the 3rd stationary mirror, the 3rd stationary mirror reflexes to this second rotating mirror with this transmitted light, this second rotating mirror with this transmitted light rotary reflection to this this second precalculated position of to be processed.

4. the optical system of laser as claimed in claim 2 site processing, it is characterized in that: this second reflector element only comprises one second rotating mirror, this second rotating mirror with this transmitted light rotary reflection to this this second precalculated position of to be processed.

5. the optical system of laser as claimed in claim 3 site processing, it is characterized in that: this first stationary mirror and the 3rd stationary mirror are positioned at the same horizontal line opposingly.

6. the optical system of laser as claimed in claim 3 site processing, it is characterized in that: this first rotating mirror and this second rotating mirror are positioned at the same horizontal line.

7. the optical system of laser as claimed in claim 2 site processing, it is characterized in that: this first stationary mirror is fixedly installed on this catoptrical light path.

8. the optical system of laser as claimed in claim 3 site processing, it is characterized in that: this second stationary mirror is fixedly installed on the light path of this transmitted light, and the 3rd stationary mirror is fixedly installed on the reflected light path of this second stationary mirror reflection.

9. the optical system of laser as claimed in claim 3 site processing, it is characterized in that: this first rotating mirror and this second rotating mirror are arranged at respectively on a rotating mechanism.

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