Patent ID: 7629229

Claim:
A workpiece laser processing method, the workpiece having a plurality of first predetermined dividing lines extending in a first direction and a plurality of second predetermined dividing lines extending in a second direction intersecting the first predetermined lines, the method comprising the steps of: holding the workpiece with holding means; allowing laser beam irradiation means to emit a laser beam with a first power output to each of the first predetermined dividing lines to form a first groove thereon while performing process-transfer along the first predetermined dividing line; and allowing the laser beam irradiation means to emit a laser beam to each of the second predetermined dividing lines to form a second groove thereon while performing process-transfer along the second predetermined dividing line, a power output of the laser beam emitted from the laser beam irradiation means being the first power output until the second predetermined dividing line reaches a predetermined position immediately before the first groove, the laser beam with a second power output lower than the first power output being emitted in an interval from the predetermined position to the first groove.