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:
Oct. 02, 2001
Filed:
Jun. 30, 1998
Koki Tanoue, Yokohama, JP;
Hideaki Osawa, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A data recording/reproducing optical disk comprises a plurality of land areas and a plurality of groove areas, which are formed in configuration as concentric circles in such a manner that a plurality of tracks are formed on the plurality of land areas and the plurality of groove areas, the plurality of tracks are partitioned into a plurality of zones provided on the disk from the inner side to the outer side thereof and a plurality of sector areas are formed on a track in a continuous manner with the plurality of sector areas on a next track, wherein the disk in use is rotated such that a rotation number of the disk in a zone is sequentially slowed in successive zones toward the outer side of the disk along a radial direction under a condition of a constant product of a rotation number and the number of sector areas in one track in each zone.