A method for engraving miniature two-dimensional codes in glass laser

Abstract

The invention relates to the technical field of laser engraving, in particular to a method for engraving miniature two-dimensional codes inside glass with laser. The method comprises the following steps: using the DATAMATRIX two-dimensional code coding method to generate an initial two-dimensional code image file in a circular pattern; generating a single-point pattern two-dimensional code image file composed of multiple independent single points according to the initial two-dimensional code image file in a circular pattern ;Set a processing delay parameter after each single point of the two-dimensional code image file in single-point mode to generate the target two-dimensional code image file; use the coaxial CCD camera to position the glass sample and calculate the position to be processed; adjust the optical path Make the focused spot size of the laser beam smaller than the calibration value, move the focus of the laser beam to the position to be processed inside the glass sample, and process the two-dimensional code according to the target two-dimensional code image file. Effectively prevent the tailing phenomenon caused by the vibrating mirror when the picosecond laser has a very short action time, making it possible to engrave small-size two-dimensional codes.

Description

technical field [0001] The invention relates to the technical field of laser engraving, in particular to a method for engraving miniature two-dimensional codes inside glass with laser. Background technique [0002] With the rapid development of Internet technology and smart devices, information dissemination and identification has become one of the indispensable technologies for modern devices. Early barcodes were mainly printed on the surface of goods and were scanned and recognized by machines based on the principle of spectroscopy. One-dimensional barcodes have been widely used in warehousing, industrial production, library management and other fields in the 1980s. One-dimensional barcodes have defects such as small data capacity, poor confidentiality, and poor readability after defects and dirt, making it difficult to meet the needs of an information society. Two-dimensional code is a comprehensive technology developed on the basis of one-dimensional barcode, which int...

AI Technical Summary

Problems solved by technology

[0005] The existing laser marking two-dimensional code is relatively large, and its concealment is not good, resulting in poor anti-counterfeiting effect

Due to the limitation of the size of the light spot, if the size of the QR code is reduced, the light spots will continue to overlap, resulting in local accumulation of glass and damage to the explosion point, making it impossible to identify

At the same time, when the two-dimensional code is small, the action time of the picosecond laser is extremely short, and the vibrating mirrors currently on the market cannot meet such high precision requirements and response time

Therefore, using picosecond lasers to scan small-sized QR codes will be affected by the vibrating mirror, which will cause tailing at the bottom of the dots and overlap of spots, making it impossible to obtain clearly visible QR codes.

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