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. 04, 2002
Filed:
Apr. 26, 2001
Masayuki Arai, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
To provide a disc-shaped recording medium whose tracks at borders of zones have header information to enable a pick up to transfer to a target track, and whose data fields are not influenced by crosstalk or double refraction caused by the header fields. Two header fields are formed in the two tracks and two header fields are formed in the two tracks such that header fields in the zone , header fields , header fields and header fields in the zone range successively. Thus, each of tracks in the border area has at least one header field or , and even though a pick up transfers to one of the tracks in the border area the pick up can find header information written in the header field or within a period required for the optical disc to make one rotation.