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:
Apr. 22, 2008
Filed:
Mar. 18, 2004
Seiji Inaba, Yokohama, JP;
Seiji Inaba, Yokohama, JP;
Hitachi-LG Data Storage, Inc., Tokyo, JP;
Abstract
An optical disk includes a first area, a second area having time information undistinguishable from time information of the first area and a third area having unique time information. The third area is divided into a plurality of sub-areas. Peculiar zone numbers are assigned to zones each representing the first area, the second area or any of the sub-areas and recorded in an associative-relation table memory for a management purpose. A zone number assigned to a zone of the present position of an optical pickup or a zone number assigned to a zone of a target position serving as a seek destination of the optical pickup is stored in a zone-number-storing memory for the purpose of managing the position of the optical pickup. Before a seek operation is carried out to move the optical pickup, a zone number stored in the zone-number-storing memory as a zone number assigned to a zone of the present position of the optical pickup is first changed to a zone number assigned to a zone of a target position serving as a seek destination of the optical pickup and, then, the seek operation is actually implemented to move the optical pickup to the zone identified by the newly stored zone number.