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Title:
DRAW TYPE OPTICAL DISK DEALING WITH COMPACT DISK OR DEALING WITH COMPACT DISK-ROM
Document Type and Number:
Japanese Patent JPH04125827
Kind Code:
A
Abstract:

PURPOSE: To prevent the warpage of a disk by forming a resin film on a transparent substrate on the side opposite from a protective film by using the same resin as the resin of the protective film to be formed on a reflection film layer.

CONSTITUTION: The resin film is formed at nearly the same film thickness as the thickness of the protective film on the disk surface on the side opposite from the protective film by using the resin of the same degree of shrinkage at the time of curing of the protective film. The stresses of respectively opposite directions are generated on both surfaces of the disk in this way and,therefore, the mutual stresses are negated and the stresses are not generated over the entire part of the disk. Then, the generation of the warpage of the disk arising from the interface stress is prevented and the optical disk having the excellent mechanical characteristics is obtd.


Inventors:
Miyazaki, Shuji
Application Number:
JP1990000245725
Publication Date:
April 27, 1992
Filing Date:
September 14, 1990
Export Citation:
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Assignee:
TOYO INK MFG CO LTD
International Classes:
G11B7/241; G11B7/24; (IPC1-7): G11B7/24



 
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