The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 28, 1984
Filed:
Oct. 15, 1981
Motoyasu Terao, Tokyo, JP;
Shinkichi Horigome, Tachikawa, JP;
Munehisa Mitsuya, Hachioji, JP;
Sakae Ota, Yokohama, JP;
Kazuo Shigematsu, Kawasaki, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An information recording member comprising a substrate, and a thin film formed on the substrate with or without an intermediate layer therebetween and irradiated with a recording beam to make an aperture or recess in the thin film, is disclosed in which the thin film is a crystalline film and has a composition expressed by a general formula Se.sub.x Te.sub.y M.sub.z, where x, y and z are given by formulae 0.02.ltoreq.x.ltoreq. 0.35, 0.50.ltoreq.y.ltoreq.0.98 and 0.ltoreq.z.ltoreq.0.45, respectively, and M indicates at least one element selected from the group consisting of As, Sb, Bi, S, Si, Ge, Sn, Pb, Al, Ga, In, Tl, Zn, Cd, Au, Ag, Cu, Ni, Pd, Rh, Cr, Mo, W and Ta, and in which the thin film does not deteriorate to such an extent as seen in conventional recording films when a time has elasped, since the thin film is crystalline.