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:
May. 12, 1998
Filed:
Dec. 01, 1995
Yoshitaka Sakaue, Nara, JP;
Eiji Ohno, Hirakata, JP;
Kazuhisa Ide, Osaka, JP;
Kenichi Nagata, Nishinomiya, JP;
Noboru Yamada, Hirakata, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
An optical information storage medium includes a multilayer structure formed on a substrate. The multilayer structure is formed by a sputtering process in a discharge gas and includes at least a first dielectric layer, a recording layer which shows reversible phase change between an amorphous phase and a crystal phase, and a second dielectric layer. The multilayer structure contains sufficiently small amount of the discharge gas so that a limited amount or less of voids of the discharge gas generates in the recording layer during repeated overwrite operations.