Optical recording medium and its recording method

Details Optical recording medium and its recording method Optical recording medium and its recording method

1998-09-30

2000-06-06

Evans, Elizabeth

Stock material or miscellaneous articles

Circular sheet or circular blank

428 644, 428 645, 428698, 428702, 428913, 43027013, 4304951, 430945, 369283, 369288, B32B 300

Patent

active

060715871

ABSTRACT:
An optical recording medium of phase change type which exhibits an increased number of overwritable operations is provided. The optical recording medium comprises a substrate, and a first dielectric layer, a recording layer, a second dielectric layer, and a metal reflective layer disposed on the substrate in this order, and the first dielectric layer comprises a dielectric layer 1a on the side of the substrate and a dielectric layer 1b in contact with the recording layer. The dielectric layer 1a comprises ZnS--SiO.sub.2, and the dielectric layer 1b comprises Si.sub.3 N.sub.4 and/or Ge.sub.3 N.sub.4. The second dielectric layer may comprise a single layer of ZnS--SiO.sub.2, SiO.sub.2 or oxide of a rare earth metal. The second dielectric layer may also comprise a laminate of a dielectric layer 2a comprising ZnS--SiO.sub.2 on the side of the substrate and a dielectric layer 2b comprising SiO.sub.2 or oxide of a rare earth metal on the side of the reflective layer. The dielectric layer 1b has a thickness of 0.5 to 40 nm, and ratio of thickness of the dielectric layer 1b to the thickness of the first dielectric layer is up to 0.5.

REFERENCES:
patent: 5681632 (1997-10-01), Kitaura et al.
patent: 5965229 (1999-10-01), Zhou et al.
patent: 5978349 (1999-11-01), Yoshinari et al.

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