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:
Jul. 09, 2002
Filed:
Jun. 17, 1999
Tatsuo Fukano, Aichi, JP;
Yasuhiko Takeda, Aichi, JP;
Naohiko Kato, Aichi, JP;
Tomoyoshi Motohiro, Aichi, JP;
Kabushiki Kaisha Toyota Chuo Kenkyusho, Aichi-gun, JP;
Abstract
A recording medium includes a first substance and a second substance at least in which the first and second substances undergo an oxidation-reduction reaction when an external energy is applied, thereby recording information by varying the optical characteristics. In the recording medium, the reaction of the first and second substances is suppressed, reaction which degrades the recording characteristics other than the case where the recording medium is subjected to recording. In an optical disk (i.e., the recording medium), a WO film (i.e., a second substance), a C film (i.e., a third substance) and an Sn-10 atomic % Sr film (i.e., a first substance) are formed successively on a substrate . When the recording medium is irradiated with a recording laser beam as an external energy, the WO forming the film is reduced to WO , and the Sn-10 atomic % Sr forming the film is oxidized to SrO and/or SnO mainly with the WO and the Sn-10 atomic % Sr passing through the C film and/or destroying the C film . When the recording medium is not irradiated with the recording laser beam, the presence of the C film suppresses the reaction between the WO film and the Sn-10 atomic % Sr film