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:
Jan. 01, 2002
Filed:
Mar. 14, 2000
Tatsuo Fukano, Aichi, JP;
Naohiko Kato, Aichi, JP;
Yasuhiko Takeda, Aichi, JP;
Akihiro Takeichi, Aichi, JP;
Tomoyoshi Motohiro, Aichi, JP;
Kabushiki Kaisha Toyota Chuo Kenkyusho, Aichi-gun, JP;
Abstract
In an optical disk which includes a recording film having a laminated construction, and which records information by changing optical characteristics of the recording film by applying a laser beam, there are laminatedly formed a WO film as a second layer, the WO requiring energy by about 470 kJ when it dissociates 1 mol of oxygen molecules, an Sn—43 atomic % Bi film which includes Sn as a first layer, the Sn generating energy by about 610 kJ when it bonds with 1 mol of oxygen molecules and having a melting point of about 139° C., and a resin film in this order on a guide groove forming surface of a substrate When a recording laser beam is applied, a part of Sn—43 atomic % Bi film is turned into a liquid phase, both of the films and react, and the optical characteristics of the recording film vary so that information is recorded. As a result, the retention characteristic of the recorded data is secured, and the reactivity of the recording film is enhanced.