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:
Sep. 14, 2004
Filed:
Aug. 29, 2001
Applicant:
Inventor:
Hideki Hayashi, Tsurugashima, JP;
Assignee:
Pioneer Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 7/00 ;
U.S. Cl.
CPC ...
G11B 7/00 ;
Abstract
An optical recording medium that permits high density recording and only needs a recording machine of simple structure, and a machine for reproducing recorded information from such optical recording medium. A track pitch of recording tracks is smaller than a diameter of a beam spot of a scanning laser beam, and tracking pits for tracking control are formed on the respective recording tracks. A certain number of neighboring recording tracks define a group, and in each group the tracking pits are spaced from each other in a recording track direction by a predetermined interval which is smaller than the diameter of the beam spot.