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:
Aug. 07, 2001
Filed:
Jan. 24, 2000
Hideki Hayashi, Tsurugashima, JP;
Pioneer Corporation, Tokyo-to, JP;
Abstract
An optical disc on which a plurality of data pits whose edge positions are shifted according to a multi-level pit edge recording method are recorded includes a substrate member and a plurality of tracks formed on the substrate member. A plurality of data areas and a plurality of reference areas are formed on the substrate member such that each of the data areas and the reference areas is formed continuously over the plurality of tracks. The data pits corresponding to digital data are recorded on the tracks in each of the data areas according to the multi-level pit edge recording method. Tilt reference pits which are used as a reference for detecting a tilt of the optical disc relative to a direction of a light beam which is emitted to the optical disc to record or reproduce the digital data are recorded on the tracks in each of the reference areas.