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:
Aug. 11, 2009
Filed:
Jun. 30, 2004
Takashi Kikukawa, Tokyo, JP;
Narutoshi Fukuzawa, Tokyo, JP;
Tatsuhiro Kobayashi, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
An optical recording disc includes a substrate, a third dielectric layer, a light absorption layer, a second dielectric layer, a decomposition reaction layer containing platinum oxide as a primary component, a first dielectric layer, and a light transmission layer. The decomposition reaction layer has a thickness of 2 nm to 20 nm, and the optical recording disc is constituted so that when it is irradiated with a laser beam from the side of the light transmission layer, the platinum oxide contained in the decomposition reaction layer as a primary component is decomposed into platinum and oxygen. A bubble pit is formed in the decomposition reaction layer by thus generated oxygen gas, and fine particles of the noble metal precipitate into the bubble pit, thereby forming a recording mark in the decomposition reaction layer.