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:
Jun. 06, 2000
Filed:
Dec. 16, 1997
Hitoshi Nobumasa, Shiga-ken, JP;
Kunihisa Nagino, Shiga-ken, JP;
Gentaro Ohbay Ashi, Shiga-ken, JP;
Tomoya Yamashiki, Shiga-ken, JP;
Yuji Watanabe, Kyoto, JP;
Takeshi Arai, Shiga-ken, JP;
Toray Industries, Inc., , JP;
Abstract
An optical recording medium has a high hardness layer, first dielectric layer, recording layer, second dielectric layer and reflective layer. The hardness of the high hardness layer is larger than the hardness of the first dielectric layer, and the thickness of the second dielectric layer is in the range of 3 to 50 nm. Such a rewritable phase change type optical recording medium may show reduced degradation in the write-start portion and write-end portion of frequently rewritten sectors, and have good jitter characteristics.