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:
Sep. 11, 2012
Filed:
Dec. 24, 2004
Shuichi Tasaka, Takarazuka, JP;
Hiroyuki Yamaguchi, Nishinomiya, JP;
Takashi Inoue, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
The invention provides an information recording medium including highly reliable power calibration areas, as well as an information recording and reproducing device utilizing it. The medium is an information recording medium having a recording layer including a data recordable areafor recording user information signals, a lead-in area provided on the inner periphery of the data recordable area, an inner power calibration area provided further on the inside of the lead-in area for recording test recording patterns, and a recording management area for recording management information related to the inner power calibration area. An outer power calibration areais provided on the outer periphery of the final point of recording of the user information signal on the recording layer.