Optical recording medium

Details Optical recording medium Optical recording medium

1990-03-01

1992-11-03

Shepperd, John W.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692755, G11B 724

Patent

active

051611503

ABSTRACT:
An optical recording disk intended for use as an additionally recordable CD is provided. It has a substrate, a dye or recording layer on the substrate, and a reflective layer and a protective layer disposed on the recording layer in a close contact relationship. Recording is carried out by directing recording light to the recording layer to form a pit and reproduction is carried out by directing reproducing light to the pit. A layer containing a decomposition product of the dye or recording material, but substantially free of the substrate material is present at the interface between the substrate and the recording layer where the pit is formed.

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patent: 4404656 (1983-09-01), Cornet
patent: 4527173 (1985-07-01), Gupta et al.
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patent: 4719613 (1988-01-01), Hirose et al.
patent: 4897829 (1990-01-01), Ikoma et al.
patent: 4965153 (1990-10-01), Imataki et al.
patent: 4990388 (1991-02-01), Hamada et al.
Patent Abstracts of Japan-vol. 8, No. 1 (P-246) Jan. 6, 1984, & JP-A-58 166548 (Hitachi Seisakusho K.K.) Oct. 1, 1983.
Patent Abstracts of Japan-vol. 12, No. 145 (M-693) May 6, 1988, & JP-A-62 267192 (Hitachi Maxell Ltd.) Nov. 19, 1987.

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