Optical data storage system with multiple rewritable phase chang

Details Optical data storage system with multiple rewritable phase chang Optical data storage system with multiple rewritable phase chang

1997-07-15

1998-06-02

Hindi, Nabil

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

G11B 724

Patent

active

057611882

ABSTRACT:
A multiple recording layer rewriteable phase-change optical disk and disk drive uses a reverse writing type of reversible phase-change material as the recording layer nearest the incident laser light. The disk has a light-transmissive substrate onto which the laser light is incident. The substrate supports at least two spatially-separated multilayer recording stacks, each stack including an active recording layer of reversible or rewriteable phase-change material. The recording stack located nearest the substrate on which the laser light is incident includes a reverse writing type of reversible phase change material, i.e., a phase-change material with an amorphous starting phase that is recorded onto by laser heating that converts data regions to the crystalline phase. This first recording layer has a dielectric layer in contact with it that has a high index of refraction relative to the adjacent recording layer and that acts as an optical interference film to provide a constructive optical interference effect in the recording stack. The optical interference film optimizes the contrast, reflectivity, and transmissivity of the recording stack. The optical interference film is also nonabsorbing so that laser light can pass through it to focus on a recording layer in a farther recording stack. This allows the farther recording layer to be written using reasonable laser power.

REFERENCES:
patent: 5373499 (1994-12-01), Imaino et al.
patent: 5449590 (1995-09-01), Imaino et al.
patent: 5555537 (1996-09-01), Imaino et al.
patent: 5563873 (1996-10-01), Ito et al.

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