Single-substrate multi-layer optical disk for read-only storage and phase change rewritable storage
AssigneeNEC Corporation
InventorsMitsuya Okada, Syuichi Ohkubo
Life of this patent
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Abstract
An optical disk includes a transparent rigid substrate, a phase change rewritable optical recording medium formed on the transparent rigid substrate, a transparent spacer formed on the phase change rewritable optical recording medium and having a grooved surface for storing information, and a reflecting layer formed on the grooved surface of the transparent spacer. The grooved surface of the transparent spacer and the reflecting layer form a read-only recording medium.
Claims29
An optical disk comprising:
- a transparent rigid substrate;
- a phase change rewritable optical recording medium formed on said transparent rigid substrate;
- a transparent spacer formed on said phase change rewritable optical recording medium and having a grooved surface for storing information;
- and
- a reflecting layer formed on the grooved surface of said transparent spacer,
- the grooved surface of said transparent spacer and said reflecting layer forming a read-only recording medium.
An optical disk comprising first and second disk portions adhered by an adhesive layer,
- each of said first and second disk portions comprising:
- a transparent rigid substrate;
- a phase change rewritable optical recording medium formed on said transparent rigid substrate;
- a transparent spacer formed on said phase change rewritable optical recording medium and having a grooved surface for storing information;
- a reflecting layer formed on the grooved surface of said transparent spacer, the grooved surface of said transparent spacer and said reflecting layer forming a read-only recording medium;
- and
- an overcoat layer formed on said reflecting layer,
- said overcoat layer of said first disk portion and said overcoat layer of said second portion being adhered by said adhesive layer.
A method for controlling an optical disk including a transparent rigid substrate, a phase change rewritable optical recording medium formed on said transparent rigid substrate, a transparent spacer formed on said phase change rewritable optical recording medium and having a grooved surface for storing information, and a reflecting layer formed on the grooved surface of said transparent spacer, the grooved surface of said transparent spacer and said reflecting layer forming a read-only recording medium, comprising:
- means for performing a writing, erasing and reproducing operation upon said phase change rewritable optical medium by focusing a laser beam at said phase change rewritable optical medium;
- and
- means for performing a reproducing operation upon said read-only medium by focusing a laser beam at said read-only medium.
Dependencies are inferred from the claim text.