Laser beam machining method

Details Laser beam machining method Laser beam machining method

2005-10-05

2009-10-27

Tucker, Philip C (Department: 1791)

Plastic and nonmetallic article shaping or treating: processes

Laser ablative shaping or piercing

Reexamination Certificate

active

07608214

ABSTRACT:
To provide a laser processing method which can highly accurately cut a planar object to be processed having an irregular surface as an entrance surface for processing laser light.This laser processing method irradiates a planar object to be processed with laser light while locating a light-converging point within the object, thereby forming modified regions71to77to become a starting point region for cutting along lines to cut5. The entrance surface r for the laser light in the object is an irregular surface. The lines to cut5extend over a depressed area surface r2and a protruded area surface r1in the entrance surface r. The modified region71is formed inside by a predetermined distance from the depressed area surface r2. At the time of irradiation with laser light along a part51aon the protruded area surface r1, the light-converging point is located on the outside of the object. The modified region72is formed inside by a predetermined distance from the protruded area surface r1. At the time of irradiation with laser light along a part51bon the depressed area surface r2, the light-converging point is located on the outside of the object.

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