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:
Jul. 24, 2007
Filed:
Jul. 30, 2003
Applicant:
Minoru Yonezawa, Yokohama, JP;
Inventor:
Minoru Yonezawa, Yokohama, JP;
Assignee:
Kabushiki Kaisha Toshiba, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 21/08 (2006.01);
U.S. Cl.
CPC ...
Abstract
An optical disk device has a recording information management portion which detects a distribution of a recorded region R and an unrecorded region M based on reflection light received by an optical head and an access target setting circuit which determines an access target of an optical head so as to make access to a target position of a recording layer of an optical disk while avoiding the unrecorded region M based on the detected distribution of the regions. Since an access is made while passing through only the recorded region R, a servo operation can be stabilized.