Information storage medium

Details Information storage medium Information storage medium

1988-09-06

1990-02-13

Robinson, Ellis P.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 65, 428 76, 428209, 428457, 428913, 369288, 346766, 3461351, 430945, B32B 302

Patent

active

049005987

ABSTRACT:
An optical disk comprises a polycarbonate substrate, a first protective layer, formed on the substrate and made of SiO.sub.2, a recording layer, formed on the first protective layer and made of an In-Sb-Te alloy, a second protective layer, formed on the recording layer and made of SiO.sub.2, and a surface protective layer, formed on the second protective layer and made of an ultraviolet curable resin. The recording layer has a composition of In.sub.50-x Sb.sub.50 Te.sub.y Au.sub.Z wherein x, y, and z are in atomic %, x=y+z, y.gtoreq.2z, and 1.ltoreq.x.ltoreq.6), In.sub.50-x Sb.sub.50-x Te.sub.y Au.sub.z (wherein 2x=y+z and 0<x.ltoreq.10), or (In.sub.100-x Sb.sub.x).sub.100-y-z Te.sub.y Au.sub.z (wherein 48.ltoreq.x.ltoreq.52 and 0.05.ltoreq.y+z.ltoreq.5).

REFERENCES:
patent: 3530441 (1970-09-01), Ovshinsky
patent: 4565772 (1986-01-01), Takeoka et al.
patent: 4647944 (1987-03-01), Gravesteijn et al.
patent: 4668573 (1987-05-01), Terao et al.
patent: 4702991 (1987-10-01), Takeoka et al.
CA 104 (16): 139382x, Funakoshi, 9-11-85.
CA 104(18): 159061y, Chiba 9-7-87.
S. R. Ovshinsky and H. Fritzsche; Reversible Structural Transformations in Amorphous Semiconductors for Memory and Logic; Metallurgical Transactions, vol. 2; Mar. 1971, pp. 641-645.

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