Optical disk and optical information recording method

Details Optical disk and optical information recording method Optical disk and optical information recording method

1991-02-20

1992-07-14

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369100, 369109, 369 59, 369 32, G11B 700

Patent

active

051309718

ABSTRACT:
A rewritable phase change optical disk and a method of recording optical information on the optical disk in which a first dielectric film, a recording film, a second dielectric film and a reflecting film are stacked on a substrate in this order; the recording film having composition defined by a formula Ge.sub.x Sb.sub.y Te.sub.z wherein x, y and z are atomic percentages ranginig from 7 to 17, 34 to 44 and 44 to 54, respectively, the x, y and z totalling 100; the recording film having a thickness of 10 to 35 nm; the second dielectric film having a thickness of 5 to 40 nm; the reflecting film being made of one or an alloy of at least Au, Al, Ti, Cr and Ni and having a thickness of 35 nm or more.

REFERENCES:
patent: 4290075 (1981-09-01), Jacobs et al.
patent: 5005164 (1991-04-01), Sakamoto et al.

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