Patent ID: 6531678
Filing Date: 2003-03-11
Classification: B23K,H01L,H05K

Abstract:
A method for processing a ceramic green sheet to form a plurality of penetration holes in the ceramic green sheet, comprisingshaping a laser beam radiated from a laser beam source into a predetermined shape by passing the laser beam through a mask; dividing the shaped laser beam into a plurality of laser beams comprising a zero order laser beam, a first order laser beam and a second order laser beam by passing the shaped laser beam through a diffraction grating such that the energy of a diffracted individual zero order laser beam becomes equivalent to, or less than, a threshold value which is necessary to form a penetration hole in the ceramic green sheet; reflecting the laser beams divided by the diffraction grating with a galvanomirror; converging the laser beams reflected by the galvanomirror into a plurality of converged laser beams by passage through a converging lens; and forming a first plurality of penetration holes simultaneously having a desired shape and dimension at predetermined locations of the ceramic green sheet by radiating the laser beams converged by the converging lens to the ceramic green sheet.