Patent ID: 7605344
Filing Date: 2009-10-20
Classification: B23K,B28D,Y10T

Abstract:
1. A laser beam machining method comprising: irradiating laser light to a machining target while converging the light to the inside of the machining target, thereby forming a treated area based on multiphoton absorption in the machining target along a planned cutting line of the machining target and forming a minute cavity at a predetermined position in connection with the treated area in the machining target, wherein the treated area is a molten processed area, the laser light is a pulsed laser light, a pair comprising the treated area and the minute cavity is formed by irradiating at least 1 pulse of the laser light, the laser light being relatively moved along the planned cutting line, thereby forming a plurality of pairs along the planned cutting line, and each of the minute cavities are separated by a predetermined distance along the planned cutting line.