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Title:
【発明の名称】光学式情報記録ディスクの製造方法
Document Type and Number:
Japanese Patent JP2517341
Kind Code:
B2
Abstract:
The method of manufacturing an optical disc related to the invention first forms warp prevention layer on one surface or the other surface of the disc substrate where information is recorded on one surface, and then, recording film covering the surface opposite from the surface having warp prevention layer or beam reflection film covering the information-recorded surface, and finally protection layer covering either the beam reflection film or the recording film, in this order. Thus the optical disc related to this invention can prevent damage and dust from incurring and adhering to the other surface of the disc substrate when forming these films on one surface so that the warp prevention layer can be perfectly level by suppressing swell of the layer itself. Since the warp prevention layer is formed on one surface before forming those films mentioned above on the other surface, the one surface maintains satisfactory wetness, and as a result, foam is rarely generated between the warp prevention layer and the disc substrate. Furthermore, the method of manufacturing an optical disc related to the invention introduces a system which measures the warp of the disc substrate coated with warp prevention layer before coating protection film, and then properly adjusts the thickness of the protection film to a specific thickness enough to fully cancel the warp. This effectively minimizes warping of the disc substrate itself.

Inventors:
HIGUCHI MASAHIRO
SAKAMOTO SADAO
UCHIHARA KAJI
Application Number:
JP635788A
Publication Date:
July 24, 1996
Filing Date:
January 14, 1988
Export Citation:
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Assignee:
SANYO DENKI KK
International Classes:
G11B7/24; G11B7/26; (IPC1-7): G11B7/26; G11B7/24
Domestic Patent References:
JP6163942A
Attorney, Agent or Firm:
安富 耕二 (外1名)