Optical recording medium

Details Optical recording medium Optical recording medium

1998-12-17

2000-11-14

Evans, Elizabeth

Stock material or miscellaneous articles

Circular sheet or circular blank

428 642, 428 644, 428 645, 428 646, 428457, 428913, 43027013, 4304951, 430941, 369283, 369288, B32B 302

Patent

active

061467332

ABSTRACT:
A phase change type optical recording medium comprises a dielectric layer 1a, a dielectric layer 1b, a phase change type recording layer and a second dielectric layer in the described order. The recording layer satisfies Ac/Aa.gtoreq.0.8 where Ac is an absorption coefficient of the recording layer in a crystalline region and Aa is an absorption coefficient of the recording layer in an amorphous region. The dielectric layer 1a comprises ZnS--SiO.sub.2 as main components and the dielectric layer 1b comprises a metal nitride or ZnS--SiO.sub.2 having an SiO.sub.2 content of 40 to 80 mol % as main components. At least an area of the second dielectric layer that is in contact with the recording layer comprises a metal nitride, a rare earth oxide, silicon oxide or ZnS--SiO.sub.2 having an SiO.sub.2 content of at least 40 mol% as main components. However, an optical recording medium comprising a dielectric layer 1a having an SiO.sub.2 content of 2 mol % to less than 40 mol % and a second dielectric layer having an SiO.sub.2 content of 40 to 80 mol % is precluded from the invention.

REFERENCES:
patent: 5978349 (1999-11-01), Yoshinari

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