Patent ID: 8610294
Filing Date: 2013-12-17
Classification: B23K,B41M,H01L

Abstract:
1. A laser processing method for marking a processing target with at least one of a letter and a figure, the at least one of a letter and a figure being characterized by a processing region having an outer border, the method comprising steps of: setting a plurality of processing lines in the processing region of the letter or figure to be marked; and delivering a laser beam to the processing target to mark the processing target along each of the plurality of processing lines, wherein a first processing line is set along the outer border of the processing region, and each subsequent processing line is set along a longitudinal direction of the processing region, after the laser beam is delivered along the first processing line set along the outer border of the processing region, the laser beam is delivered along a subsequent processing line set inside the outer border of the processing region, when the laser beam is delivered to the processing target, a laser spot is formed on the processing target along each processing line, a center of the laser spot having energy stronger than a periphery of the laser spot, the center of the laser spot engraving the processing target deeper than the periphery of the laser spot, and the adjacent processing lines are arranged so that a region of the processing target which is engraved by two overlapping laser spots on the respective adjacent processing lines has a depth less than that created by the center of the laser spot.