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

1998-05-12

1999-11-09

Evans, Elizabeth

Stock material or miscellaneous articles

Circular sheet or circular blank

428 644, 428 645, 428913, 43027013, 4304951, 430945, 369283, 369288, B32B 300

Patent

active

059810149

ABSTRACT:
An optical recording medium of phase change type with an increased number of overwritable operations and method for preparing such an optical recording medium is provided. In the optical recording medium of phase change type whose rate determining stage in the production has been the initialization of the recording layer, the time required for the production is reduced, and stable recording/reproducing properties are realized from the first overwriting operation. The optical recording medium comprises a transparent substrate and a recording layer on the transparent substrate. In the medium, the recording layer comprises at least one Sb-based thin film and at least one reactive thin film; the Sb-based thin film is in contact with said reactive thin film; the Sb-based thin film has been formed from an Sb-based material containing at least 95 at % of Sb; and the reactive thin film has been formed from an In-Ag-Te-based material mainly comprising In, Ag and Te or In, Ag, Te and Sb; and the reactive thin film contains 0.5 to 10 at % of oxygen. In the formation of the reactive thin film, the sputtering is conducted by introducing an inert gas and oxygen gas into the sputtering chamber.

REFERENCES:
patent: 5627012 (1997-05-01), Tominaga et al.
patent: 5882759 (1999-03-01), Hirotsune et al.
patent: 5891542 (1999-04-01), Tominaga et al.

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