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:
Feb. 21, 2012
Filed:
Dec. 29, 2010
Motoshi Ito, Osaka, JP;
Takashi Ishida, Kyoto, JP;
Hiroshi Ueda, Nara, JP;
Yoshikazu Yamamoto, Osaka, JP;
Mamoru Shoji, Osaka, JP;
Motoshi Ito, Osaka, JP;
Takashi Ishida, Kyoto, JP;
Hiroshi Ueda, Nara, JP;
Yoshikazu Yamamoto, Osaka, JP;
Mamoru Shoji, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A multi-layered information recording medium including a plurality of recording layers, the multi-layered information recording medium comprising: a user data area for recording user data; and a plurality of spare areas including at least one replacement region, wherein when the user data area includes at least one defect region, the at least one replacement region may be used in place of the at least one defect region, wherein a first spare area of the plurality of spare areas is positioned so as to be contiguous to a first user data area of a first recording layer, a second spare area of the plurality of spare areas is positioned so as to be contiguous to a second user data area of a second recording layer, and the first spare area and the second spare area are positioned approximately at the same radial position on the multi-layered information recording medium.