| 摘要 |
PURPOSE:To obtain excellent long-term reliability by forming a specific polymer film as a protective film. CONSTITUTION:A dielectric layer 2 consisting of Si3N4, etc., a recording film 3, a reflecting film 4 consisting of Al, etc., and further a dielectric layer 5 which protects the films 3, 4 by covering the side surfaces thereof are successively laminated on a substrate 1 consisting of polycarbonate, etc., and the circumference thereof is fully coated with the polymer film 6 consisting of chlorinated paraxylene. The thickness of the film 6 is <=36mum in max., preferably <=20mum, more preferably 3 to 5mum. Moisture permeability is drastically suppressed in this way and the deterioration of signals is lessened. The excellent long-term reliability is thus obtd. |
