Two-dimensional code laser marking method and device based on liquid crystal spatial light modulator

Abstract

Disclosed is a two-dimensional code laser marking method and device based on a liquid crystal spatial light modulator. The device mainly comprises a laser device, a polarizer, beam expanding collimation systems, the liquid crystal spatial light modulator, a computer, focusing collimation systems and an imaging lens. Lasers emitted by the laser device pass through the polarizer to become polarized light, the polarized light passes through the beam expanding collimation systems to become parallel light, the parallel light is incident to the liquid crystal spatial light modulator, the liquid crystal spatial light modulator performs image information modulation on the parallel light, a two-dimensional code image output by two-dimensional code generating software generates a kinoform through the computer so as to precisely control a phase image displayed on the liquid crystal spatial light modulator, diffraction light splitting is performed on the parallel light through the image displayed on the liquid crystal spatial light modulator, and therefore the parallel light becomes diffraction light, the light beam of the diffraction light is narrowed and collimated through the focusing collimation systems, and finally the lasers are focused on a workpiece surface required to be marked through a flat-field lens.

Description

technical field [0001] The invention relates to a method and a device for marking a two-dimensional code on the surface of a part based on a laser, in particular to a method and a device for marking a two-dimensional code on the surface of a part based on a laser and a liquid crystal spatial optical modulator, and belongs to the technical field of laser processing. Background technique [0002] Item direct object traceability technology is a kind of automatic identification and information management technology that directly records machine-readable two-dimensional code information on items for item traceability management, and has become a An important supporting technology for the application of Internet of Things technology in the manufacturing industry. In recent years, with the development of two-dimensional code itself, reading technology and laser technology, the two-dimensional code generated by laser fine marking technology has gained more and more recognition as th...

AI Technical Summary

Problems solved by technology

[0005] The invention overcomes the shortcomings of serially processed laser galvanometer scanning technology marking speed and laser mask marking technology that cannot realize computer programmable control and poor flexibility, and provides a parallel processing and computer programmable control laser high-speed marking The method and device of a two-dimensional code can complete the identification of a two-dimensional code within the time of ms level

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