Phase change optical information recording medium including mean

Details Phase change optical information recording medium including mean Phase change optical information recording medium including mean

1991-05-28

1993-01-12

Nguyen, Hoa T.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692755, 3692751, 369100, 369109, G11B 724

Patent

active

051795477

ABSTRACT:
On the phase change optical information recording medium, a plurality of protection pits each smaller than one pit on the pre-pit region are provided over the entire data region of the recording film at least on its surface. Therefore, even when overwriting is repeatedly performed, the reproduced data waveform is distorted less frequently and data error is reduced. By forming the group of protection pits, the adhesive strength between the phase change recording film and the protective film can be increased, and the reliability of exfoliating strength can be improved.

REFERENCES:
patent: 4761775 (1988-08-01), Murakami
patent: 4910725 (1990-03-01), Drexler et al.
patent: 4949331 (1990-08-01), Maeda et al.
patent: 4991163 (1991-02-01), Tokushuku et al.

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