Method of making an optical information recording medium and met

Details Method of making an optical information recording medium and met Method of making an optical information recording medium and met

1993-09-03

1995-09-12

Wright, Lee C.

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Radiation sensitive composition or product or process of making

430272, 430273, 430275, 430290, 430346, 430945, 427162, G03C 172, G11B 724

Patent

active

054495890

ABSTRACT:
A rewritable optical information recording medium of phase-change type wherein the recording, erasing, reproduction and rewriting of information are effected by irradiation of a high density energy flux such as laser beams. With the aim of obtaining a high erasing ratio in overwriting using a single laser beam, a constitution of medium has been devised whereby the same temperature-rise profile can be obtained for both the recorded mark part and the unrecorded (erased) part of the recording film. For example, by selecting the film thickness of each layer such that the optical absorbance at the wavelength of irradiation light source is the same in both the recorded part and the unrecorded part, an erasing ratio of -30 dB or more has been attained.

REFERENCES:
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patent: 4670345 (1987-06-01), Morimoto et al.
patent: 4710899 (1987-12-01), Young et al.
patent: 4743526 (1988-05-01), Ando et al.
patent: 4847132 (1989-07-01), Takao et al.
patent: 4879205 (1989-11-01), Suzuki
High Speed Overwritable Phase Change Optical Disk Material, Noboru Yamada et al., Japanese Journal of Applied Physics, vol. 26 (1987), Supplement 26-4, pp. 61-66.
Optical Properties of Thin Solid Films, O. S. Heavens, Dover Publication, 1965, pp. 69-75.
CRC Handbook of Chemistry and Physics, 63rd Edition pp. E202, E203.

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