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:
Nov. 28, 1995
Filed:
Nov. 07, 1994
Fumihiko Yokogawa, Tsurugashima, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
A tracking servo apparatus for an optical disk player enables a braking operation to rapidly draw into tracking servo control even in case of a double density track. The tracking servo apparatus generates an odd/even discrimination signal indicating on which of an odd number track or an even number track a position for reading information by a pick is currently present, samples a tracking error signal according to an edge position of the odd/even discrimination signal, selectively outputs either a positive or a negative section of the tracking error signal according a polarity of the sampled tracking error signal as a brake signal to a driving means for a tracking actuator, and thus draws the position for reading information by a pick-up onto a track which can be put under tracking servo control.