Optical disk and method of manufacturing the same
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsYukari Toide, Motohisa Taguchi, Yoshio Fujii
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Abstract
An optical disk having a warp preventive film for preventing the warp of the substrate which does not exfoliate for a long period by forming the warp preventive film on a textured area on the substrate surface with a minute embossment, and a method of manufacturing the optical disk by controlling the plasma etching condition for forming a textured area for reinforcing the bonding force of the warp preventive film on the substrate surface, so that the warp preventive film being bonded after forming the textured area may not exfoliate for a long period.
Claims14
An optical disk comprising:
- a substrate made of translucent material, having opposite first and second sides,
- a recording film formed on the second side of the substrate,
- a warp preventive film formed on the first side of said substrate, for preventing warp of the substrate, and
- a protective film disposed on and contacting the warp preventive film and the first side of said substrate, for preventing the warp preventive film from exfoliation.
An optical disk comprising:
- a substrate of translucent material, having opposite first and second surfaces, wherein said second surface has a grooved area;
- a recording film, having opposite first and second sides, wherein said recording film first side is facing said substrate second surface;
- a warp preventive film having opposite first and second sides, wherein said second side is facing said substrate first surface;
- and
- a protective film means for minimizing exfoliation of said warp preventive film, said protective film means contacts at least a portion of said first side of said warp preventive film and a portion of said substrate first surface.
Dependencies are inferred from the claim text.