Re-writable phase change type optical disk with suppressed recor

Details Re-writable phase change type optical disk with suppressed recor Re-writable phase change type optical disk with suppressed recor

1995-05-22

1996-05-28

Neyzari, Ali

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369 13, 369288, 428694DE, G11B 1100, G11B 724

Patent

active

055219012

ABSTRACT:
A phase change type optical disk includes a transparent substrate, a recording layer, a first transparent protection layer, a reflective layer, and a transparent interference layer. The recording layer is formed above the transparent substrate to cause a reversible phase change between a crystalline state and an amorphous state. The recording layer causes a phase change upon being irradiated with a laser beam, thereby recording, reproducing, and erasing information. The first transparent protection layer is formed on the recording layer to protect the recording layer. The reflective layer is formed above the recording layer to reflect light transmitted through the recording layer and causes the reflected light to be incident on the recording layer. The transparent interference layer is formed between the first protection layer and the reflective layer to cause light beams reflected by the reflective layer to optically interfere with each other. Light transmitted through the recording layer is multiple-reflected between the reflective layer and an interface between the interference layer and the first protection layer.

REFERENCES:
patent: 5093174 (1992-03-01), Suzuki et al.
patent: 5341349 (1994-08-01), Kagami et al.
patent: 5368986 (1994-11-01), Terao et al.
Patent Abstracts of Japan; vol.: 14, No. 138; JPA 02003119; Mar. 15, 1990.
Patent Abstracts of Japan; vol.: 14, No. 561; JPA 02240842; Dec. 13, 1990.

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