Laser processing unit for solar cell laser ablation machine

Abstract

The invention discloses a laser processing unit for a solar cell laser ablation machine. The laser processing unit comprises a laser assembly, a platen and a lifting adjusting platform which is used for adjusting the height of the platen. The laser assembly comprises a laser, a beam expansion lens, a shaping lens package, a galvanometric scanner and a field lens which are arranged sequentially in the laser transmission direction. The laser, the beam expansion lens, the shaping lens package and the galvanometric scanner are installed on the platen. The field lens is perpendicularly installed below the galvanometric scanner. The center line of a light output port of the laser, the center line of the beam expansion lens and the center line of the shaping lens package coincide. The laser processing unit has the advantages of being simple in structure, low in cost, short in laser light path, high in transmission efficiency and the like.

Description

technical field [0001] The invention relates to solar cell laser processing equipment, in particular to a laser processing unit for a solar cell laser ablation machine. Background technique [0002] As the production efficiency of photovoltaic solar cells is getting higher and higher, the industry has also invested a lot of research on how to improve the conversion efficiency of solar cells. High-efficiency laser processing technology can not only improve the conversion efficiency of solar cells, but also reduce the The overall cost of the equipment is reduced, and the pollution to the environment is reduced. [0003] At present, it represents the high-precision laser processing equipment of the new high-efficiency solar cell back passivation process that represents the development direction of the industry, such as a fully automatic solar cell laser processing equipment disclosed in the patent document CN105618934A. After the laser is output from the laser, it first passes ...

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Problems solved by technology

[0003] At present, it represents the high-precision laser processing equipment of the new high-efficiency solar cell back passivation process that represents the development direction of the industry, such as a fully automatic solar cell laser processing equipment disclosed in the patent document CN105618934A. After the laser is output from the laser, it first passes through the first The No. 2 reflector changes the optical path by 90 degrees, and then passes through the No. 2 reflector to change the optical path by 90 degrees, and then passes through the beam expander and vibrating mirror, and finally outputs through the focused field mirror. This type of laser processing equipment has a complex structure, and the laser The optical path is long and needs to be reflected by two total reflection mirrors. The angular direction of the two mirrors is very important to the laser transmission direction and has a great impact on the laser transmission efficiency. It is difficult to calibrate and adjust, the cost is high, and the debugging time is long.

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