Patent ID: 8933369
Filing Date: 2015-01-13
Classification: B23K,B28D,B65G,C03B,C03C,G02F,H01L,Y02P,Y10T

Abstract:
1. A method of cutting a substrate, the method comprising steps of: irradiating a substrate with a pulsed laser light having a pulse width of 1 μs or less at a converging point within the substrate, so that the converging point of the pulsed laser light is positioned within the substrate and a peak power of the laser light at the converging point is not less than 1×10 causing a crack to be naturally grown from the modified region to reach the laser light incident surface of the substrate along the plurality of intersecting cutting lines, the crack not being started from the laser light incident surface of the substrate; and after the causing step, applying a force to the substrate to make the crack further grow to thereby cut the substrate.