Patent ID: 6558741
Filing Date: 2003-05-06
Classification: C03C,G02B,Y10S

Abstract:
A method of making an aluminum reflecting mirror in which first to fifth layers are laminated on a glass substrate successively from said glass substrate side, said method comprising:a step of evacuating a chamber accommodating therein said glass substrate and respective materials for forming said first to fifth layers; a step of forming said first layer as a protective film by depositing SiO on said glass substrate; a step of forming said second layer as an aluminum reflective layer by depositing Al on said first layer; a step of forming said third layer as a transparent protective layer by depositing MgF2 on said second layer in two substeps, a first substep of depositing MgF2 at a deposition temperature lower than 80Â° C.; and a second substep of depositing MgF2 at a deposition temperature higher than 300Â° C.; a step of forming said fourth layer as a transparent protective layer by depositing CeO2 on said third layer; a step of forming said fifth layer as a transparent protective layer by depositing SiO2 on said fourth layer while introducing O2 gas into said chamber.