Optical recording medium and method for preparing the same

Details Optical recording medium and method for preparing the same Optical recording medium and method for preparing the same

1998-06-23

2000-11-28

Angebranndt, Martin

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Radiation sensitive composition or product or process of making

43027012, 430945, 3692752, 369288, 428 646, 428913, 428912, G11B 724

Patent

active

061533556

ABSTRACT:
In a (Ge,Sb)-Te based optical recording medium of phase change type whose rate determining step in production has been initialization of the recording layer, the time required for production is reduced, and stable recording/reproducing properties are realized from the first overwriting operation. A phase-change type optical recording disc of write once read many-type requiring no initialization is also provided. The optical recording medium comprises a transparent substrate and a recording layer on the transparent substrate. The recording layer comprises at least one Te-based thin film and at least one reactive thin film, and the Te-based thin film is in contact with said reactive thin film. The Te-based thin film is formed from a Te-based material containing at least 95 at % of Te, and the reactive thin film is formed from a (Ge,Sb)-based material mainly comprising Ge and/or Sb. The optical change type material is formed by the mixing of the materials constituting the reactive thin film and Te. After forming the recording layer, the recording layer is irradiated with a continuous laser beam to mix the material constituting the Te-based thin film and the material constituting the reactive thin film.

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