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. 08, 2004
Filed:
Aug. 23, 2001
Hideyo Kamiyama, Tokorozawa, JP;
Pioneer Corporation, Tokyo-To, JP;
Abstract
A track-jump controlling apparatus that controls track-jump operations over disks complying with various DVD data formats includes a quad photodetector having quadrants B to B , a DPDTE signal generator for generating DPD tracking error signals, a push-pull signal generator for generating push-pull signals, and a TZC signal generator having a selector switch for switching the path between the DPDTE signals and the push-pull signals and a comparator for generating TZC signals. In order to prevent failure to obtain proper TZC signals in a seek operation with respect to a DVD-RW, etc. involving passage over an unrecorded area during reproduction, for example, the selector switch is switched to the push-pull signal side to prevent track counting failure associated with the track-jump operation with respect to the DVD-RW.