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:
Mar. 30, 2010
Filed:
Jul. 22, 2005
Hiroaki Ono, Fujisawa, JP;
Tatsuya Ishitobi, Kawasaki, JP;
Hiroaki Ono, Fujisawa, JP;
Tatsuya Ishitobi, Kawasaki, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A recording/playback device includes an information conversion unit converting video or audio information, received from an external source, to video or audio data for recording on a rewritable optical disk, a recording unit recording the video or audio data on said optical disk, and a playback unit playing back the video or audio data recorded on said optical disk, in which the optical disk has at least two recording layers and, when the video or audio data is recorded in two or more layers of the optical disk and then a part of the video data or audio data recorded in each layer is erased, a part of the video or audio data left unerased is moved so that a number of layers, in which the video or audio data left unerased is recorded, is reduced.