Patent ID: 6470712
Filing Date: 2002-10-29
Classification: B23K,C03B,C03C,G02B,Y02P

Abstract:
A laser processing method for a glass substrate, comprising radiating a laser beam on the glass substrate, absorbing energy of the laser beam into the glass substrate, and removing a part of the glass by melting, evaporation or ablation due to the energy, wherein microscopic concavities are formed on a surface of said glass substrate by changing the optical path of the laser beam with optical path changing means, thereby moving a spot position of the laser beam radiated on the surface of said glass substrate,wherein said optical path changing means comprises a first mirror for moving the spot position of the laser beam in a X-direction on the surface of said glass substrate, and a second mirror for moving the spot position of the laser beam in a Y-direction on the surface of said glass substrate, wherein said glass substrate contains silver in the form of Ag atoms, Ag colloid or Ag ions to a predetermined depth or as a whole from the surface, and has a concentration slope of the silver showing the highest concentration at the side surface to be processed and gradually decreasing to the other side surface thereof.