Patent ID: 6144397
Filing Date: 2000-11-07
Classification: B23K,G02B,H01L

Abstract:
A method for laser marking a workpiece with a stamp, comprising the steps of:generating a laser beam;dividing the laser beam into two or more sections each of which has an optical axis extending in a direction different than that of the laser beam and then at least partially superposing the laser beam sections;sequentially displaying divisional patterns on a mask which can display a marking pattern, each divisional pattern corresponding to one scanning line of a first deflector;deflecting the superposed laser beam sections with a first deflector and sequentially scanning the divisional patterns with the superposed laser beam sections to create transmitted scanning beams;with a second deflector, moving a stamp position on a surface of the workpiece in a direction perpendicular to a scanning direction for every one of the scanning transmission beams transmitted through the divisional patterns displayed on the mask, thereby to synthesize and stamp the divisional patterns onto the workpiece, the superposed laser beam sections having an equalized energy distribution in the direction perpendicular to the scanning direction of the transmitted scanning beams.