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Method for stripping hard and brittle materials by means of laser radiation

A technology of laser radiation and stripping, applied in laser welding equipment, welding/welding/cutting items, manufacturing tools, etc., can solve problems such as difficulties in thin glass plates

Active Publication Date: 2017-10-13
FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional machining (cutting, drilling) is significantly more difficult for thin glass sheets compared to large material thicknesses

Method used

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  • Method for stripping hard and brittle materials by means of laser radiation
  • Method for stripping hard and brittle materials by means of laser radiation
  • Method for stripping hard and brittle materials by means of laser radiation

Examples

Experimental program
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Effect test

Embodiment Construction

[0028] exist figure 2 A V-shaped lift-off depression 1 is schematically shown in the illustration of , which is formed in a thin glass material 2 with a thickness x. The stripped recess 1 has a stripped side wall 3 starting from an entrance edge 4 at a surface 5 of the material.

[0029] The two vector arrows firstly indicate the surface normal on the ablation depression indicated by the reference numeral 6 and secondly indicate the direction of the surface normal 7 of the non-ablative surface of the glass material 2 . The angle between the two surface normals 6 and 7 represents the side wall angle w of the side walls of the lift-off recess 1 in the material 2 .

[0030] Such as image 3 As shown, the aforementioned limit angle wmax can be determined by the intersection of the curve 1 of the absorbed strength in the material and the curve 2 of the stripped threshold strength, as shown in the figure. If the absorbed strength is less than the threshold strength for stripping...

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PUM

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Abstract

The invention relates to a method for stripping brittle hard materials by means of laser radiation, wherein a stripping recess is formed in the material by stripping, said stripping recess having a side wall angle w of the side walls of the stripping recess, where The side wall angle w is defined as the angle between the surface normal on the side wall of the stripped recess and the surface normal on the non-stripped surface of the material, where during stripping the side wall angle w exceeds Material-specific limiting angle wmax. The beam radius of the laser radiation at the entrance to the ablation recess is adjusted slightly such that the side wall angle w reaches almost 90 degrees and the achievable ablation depth is at least 2 times that for the larger beam radius case below, where In the case of the larger beam radius mentioned above, the side wall angle is smaller than the material-specific limit angle wmax.

Description

technical field [0001] The invention relates to a method for stripping, i.e. cutting, scratching, drilling, brittle and hard materials by means of laser radiation, in which stripping depressions are formed in the material by stripping, said stripping depressions having the The sidewall angle w of the sidewall of the recess, where the sidewall angle w is defined as the angle between the surface normal on the sidewall of the stripped recess and the surface normal on the non-stripped surface of the material. Background technique [0002] Such methods are used in particular in display technology, in which thin glass substrates, a brittle and hard material, have to be handled. It is precisely industrial display technology that occupies a larger and larger market space and tends towards lighter and lighter devices, and thus also towards thinner glass sheets for eg smartphones and tablet computers. [0003] Thin glass substrates offer advantages for displays precisely when the dur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/36B23K26/402C03C23/00
CPCB23K26/36B23K26/38B23K26/382B23K26/40C03C23/0025B23K2103/50
Inventor W.舒尔茨U.埃佩尔特
Owner FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV