Optical information medium having a base plate made of polymethy

Details Optical information medium having a base plate made of polymethy Optical information medium having a base plate made of polymethy

1988-04-06

1990-04-17

Stephan, Steven L.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369288, 430945, 430270, G11B 724

Patent

active

049186833

ABSTRACT:
An optical disc consists of a base plate, a reflective thin layer and a protective thin layer. As the base plate, polymethylmethacrylate is used. Since defects in the protective thin layer are a function of defects in the base plate, in order to reduce defects in the protective thin layer, defects in the base plate are reduced. For reducing defects in the base plate, a copolymer of methyl methacrylate and methyl acrylate is used.

REFERENCES:
patent: 4397805 (1983-08-01), Holmes
patent: 4405671 (1983-09-01), Ozawa et al.
patent: 4650742 (1987-03-01), Goto et al.

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