Optical information recording medium, producing method thereof a

Details Optical information recording medium, producing method thereof a Optical information recording medium, producing method thereof a

1998-07-29

2000-11-28

Diamond, Alan

Chemistry: electrical and wave energy

Processes and products

Coating, forming or etching by sputtering

20419212, 20419215, 20419216, 20419223, 2041922, 427569, 427576, 427109, 427124, 427571, 4271263, 427570, 428 643, 428 644, 428 655, 3692752, 3692755, C23C 1434, G11B 724, G11B 726, G11B 700

Patent

active

061530638

ABSTRACT:
In a phase-change recording medium, a recording medium is provided with a barrier layer including Ge--N, Ge--N--O between a recording layer and a dielectric protective layer in order to prevent a chemical reaction and an atom diffusion between the recording layer and the dielectric protective layer. A barrier material can be also applied to the protective layer itself. Thereby, it is possible to considerably suppress a reduction of a reflectivity and a reduction of a signal amplitude due to the repeat of recording and erasing, such reductions being observed in a conventional phase-change optical information recording medium, and thereby the number of overwriting times can be increased.

REFERENCES:
patent: 4680742 (1987-07-01), Yamada et al.
patent: 4693805 (1987-09-01), Quazi
patent: 4984231 (1991-01-01), Yasuoka et al.
patent: 5283133 (1994-02-01), Tsutsumi et al.
Patent Abstracts of Japan, Abstract for JP 07-326073, Dec. 1995.
Patent Abstracts of Japan, Abstract for JP 06-195,747, Jul. 1994.
Abstract for JP 5-290408, Nov. 1993.
Abstract for JP 5-2769, Jan. 1993
Abstract for JP 4-78032, Mar. 1992.
N. Yamada et al., "Thermally balanced structure of phase-change optical disk for high speed and high density recording", Trans. Mat. Res. Soc. Jpn., vol. 15B, 1035, (1993), (month unknown).
European Search Report corresponding to application No. PCT/JP97/00729 dated Jul. 23, 1997.

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