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. 30, 2007
Filed:
Mar. 21, 2005
Hiroaki Irie, Takatsuki, JP;
Keiichiro Horai, Sanda, JP;
Kenichi Nishiuchi, Hirakata, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A main information areacapable of recording an information signal and a subsidiary information areafor recording subsidiary information that is different from the information signal are divided in one principal plane direction of a substrate, and an information layer for recording the information signal in the main information areais provided also in the subsidiary information area, and medium identification information for distinguishing the medium optically is recorded in the information layer of the subsidiary information areawithout changing the shape of the information layer. As a result, the medium identification information can be recorded in an optical recording mediumstably. In particular, the initialization of a phase change type optical recording medium and the recording of the medium identification information can be performed at the same time, so that the production process can be simplified, and the production costs can be reduced.