Optical recording medium

Details Optical recording medium Optical recording medium

1989-12-19

1990-10-23

Ryan, Patrick

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 65, 428207, 428412, 428421, 428422, 428457, 4284744, 428480, 428913, 346 76L, 3461351, 3692751, 369288, B32B 302

Patent

active

049651145

ABSTRACT:
An optical recording medium of a substrate and a thin metal film laminated thereon formed of a noble metal (A), a chalcogen (B) and bismuth (C) as essential components in amounts within the region of the phase diagram of FIG. 1 defined by the points: a; (A.sub.80 B.sub.15 C.sub.5), b; (A.sub.15 B.sub.80 C.sub.5), c; (A.sub.2 B.sub.80 C.sub.18), d; (A.sub.2 B.sub.49 C.sub.49) and e; (A.sub.80 B.sub.10 C.sub.10), said medium capable of absorbing a laser beam of a specific wavelength region thereby recording information by the pits of cavities formed in the film by the laser beam.

REFERENCES:
patent: 4709991 (1987-10-01), Tokeoka et al.

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