Patent ID: 6168910
Filing Date: 2001-01-02
Classification: B08B,B23K,H05K,Y10S

Abstract:
A method for removing a decomposition residue and/or a processing residue, of a material of a resin layer, which is attached to the periphery and inside of holes formed in the resin layer of a printed board, comprising (a) shooting a laser beam having a wavelength for laser ablation at the holes to thereby remove the decomposition residue and/or the processing residue, (b) reshaping the sectional shape perpendicular to the direction of advance of the laser beam by beam reshaping optics, with the reshaped laser beam shooting simultaneously all the holes and vicinity thereof, wherein the total irradiated area on the printed board is 200%-10000% of the total sectional area of the holes formed in the printed board.