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:
Jun. 21, 2005
Filed:
Apr. 13, 2001
Hiroyuki Takemoto, Miyagi, JP;
Masayoshi Nagata, Kanagawa, JP;
Hiroyuki Takemoto, Miyagi, JP;
Masayoshi Nagata, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
An optical disc is disclosed, having tracks formed in a spiral shape or a concentric circle shape, each of the tracks being radially divided into a plurality of zones, data being recorded and/or reproduced at different angular velocities in the individual zones in such a manner that the angular velocity in the same zone is the same, wherein a buffer area is formed at a zone boundary, and wherein at least one pit portion is formed in the buffer area so that the pit portion is almost radially adjacent to a pit portion of a zone on the inner periphery side and a pit portion of a zone on the outer periphery side.