Patent ID: 6492616
Filing Date: 2002-12-10
Classification: B23K,H01L,H05K

Abstract:
In laser beam machining of resin film made from polyimide or resin mainly containing polyimide for a wiring board, a process for laser beam machining of resin film for a wiring board which comprises forming openings in the resin film by irradiating the resin film with a continuous-wave laser beam which is scanned in one or two ways while moving the resin film in the direction nearly at a right angle to the scanning direction of the laser beam and controlling the energy density on the irradiated surface at 3-50 J/cm2 with the use of a continuous-wave carbon dioxide gas laser beam machine emitting at a wavelength of 9.2-9.7 &mgr;m equipped with a device for scanning the laser beam in one or two ways and a worktable capable of moving the resin film in the direction nearly at a right angle to the scanning direction of the laser beam.