Optical recording media

Details Optical recording media Optical recording media

1998-06-01

2000-09-12

Evans, Elizabeth

Stock material or miscellaneous articles

Circular sheet or circular blank

428 642, 428 644, 428 645, 428 646, 428 647, 428457, 428913, 43027013, 4304951, 430945, 369283, 369288, B32B 300

Patent

active

061175110

ABSTRACT:
An optical data recording medium utilizing reversible inter-crystalline-amorphous phase changes for recording, reproducing and erasing data as phase changes of a recording film caused by laser beam irradiation. The medium is formed by a lamination of a transparent substrate having tracking guide grooves for laser beam tracking, a base film formed on the substrate, a first protective film formed on the base film, a phase change type recording film formed on the first protective film, a second protective film formed on the recording film, and a reflecting film formed on the second protective film. Thus formed, the medium improves the over-writing characteristics of phase change type optical discs and permits high density recording.

REFERENCES:
patent: 5587216 (1996-12-01), Yoshioka et al.
patent: 6004646 (1999-12-01), Ohno et al.
English translation of Examiner's comments in Japanese Office Action dated Apr. 27, 1999.
Kazuhiro, N., "Recording and reproducing method of optical recording medium," Patent Abstracts of Japan, Feb. 16, 1997.
Keigo, T., "Optical information recording medium," Patent Abstracts of Japan, Oct. 13, 1995.
Shoichi, K., "Rewritable optical information recording medium," Patent Abstracts of Japan, Aug. 13, 1993.

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