Patent ID: 8962363
Filing Date: 2015-02-24
Classification: B28D,H01L

Abstract:
1. A method for forming a groove on a surface of a flat plate formed of a nitride semiconductor crystal having an A-axis, a C-axis, and an M-axis, the method comprising: (a) moving a disk-shaped dicing blade along a direction of the A-axis to form a first inclined surface and a second inclined surface on the surface of the flat plate, wherein the flat plate has a principal surface; the disk-shaped dicing blade has an edge along the circumference thereof; the edge is in contact with the flat plate; the following mathematical formulae (I), (II), and (III) are satisfied: where the angle θb represents an angle formed between a surface of the edge and a radial direction of the disk-shaped dicing blade in a cross-section which includes the M-axis and the C-axis; the angle a represents an angle formed between the principal surface and the M-axis; and each of the first inclined surface and the second inclined surface has an arithmetical mean deviation Ra of not less than 0.046 and not more than 0.131.