Laser cutting method and device

Abstract

The invention discloses a laser cutting method and a device, which can cut a workpiece with a bottom and an opposed top. A workpiece thickness which is formed between the bottom and the top is parallel to an axial direction. A laser light source emits laser light which then irradiates the workpiece. The laser light is then concentrated through a lens on the bottom of the workpiece. A first modified track is formed on the bottom of the workpiece through the laser light. The irradiation positions of the laser light are changed at least once in a way to be parallel to the axial direction. At least one zooming focus is formed on the workpiece. The projecting position of the zooming focus is located on the first modified track. A zooming modified track is further formed on the workpiece through the laser light on the zooming focus. The projecting position of the zooming modified track overlaps with the first modified track. A continuous modified interface is formed between the first modified track and the zooming modified track.

Description

technical field [0001] The present invention relates to a laser cutting method and device, in particular to a method and device for non-destructive processing of the processed object by rising from the bottom of the workpiece to the top to form a continuous modified interface, suitable for non-linear laser cutting, and capable A laser cutting method and device for effectively reducing laser cutting processing time. Background technique [0002] Traditional glass cutting uses wheel cutter cutting, but for the rapid development of various industries, especially for touch panel related industries, the requirements for glass strength are getting higher and higher, which also makes traditional wheel cutter glass cutting face difficulties, such as Corning ( The strengthened glass produced by Gorilla glass is too strong (>120Kgf1.1mm), which is six times stronger than ordinary strengthened glass (such as Soda Lime strengthened glass). When using traditional wheel cutters to cut ...

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Problems solved by technology

[0012] Based on the above-mentioned existing patents and published documents, although laser cutting technology has been applied to different technology industries, most laser cutting methods and structures use CO2 lasers, which require pre-cut cracks, making it difficult to apply to non-linear processing , and if the processed object is destructively processed, it will take a relatively long time

In addition, when the laser light is focused on the inside of the workpiece, it will be difficult to perform circular, arc or non-linear cutting with any combination of irregular and arbitrary curves. Although some existing patents can set the focus position on the bottom surface of the workpiece, they still It is processed from the top surface of the workpiece to the bottom surface of the workpiece in a full cut method, which is still destructive processing

In addition, although a small number of laser cutting uses short pulse lasers to perform non-linear cutting, it is still destructive and extremely time-consuming. For example, when cutting glass with a thickness of 0.7mm with a 5W UV laser, the processing length is 50mm , it must be processed 400 times at a speed of 100mm / s to cut the glass, and the processing time it consumes is at least 200 seconds

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