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:
Feb. 11, 1992
Filed:
Mar. 16, 1989
Yutaka Osada, Fujisawa, JP;
Keiichi Kaneko, Yokohama, JP;
Victor Company of Japan, Ltd., Yokohama, JP;
Abstract
A position control system for a read/write device for fast positioning the read/write device at a particular track of a disk having a tracking pattern in the recording medium. The system having a transportation unit for transporting the read/write device to a target track and a control loop containing a BAF (multi-peak band-pass filter), includes a position control unit for controlling the position of the read/write device so as for the read/write device to track the target track, and a storage unit for storing the internal variables of the BAF filter. When the operation by the transportation unit is switched to the operation of the position control unit, the operation of the BAF filter is performed in accordance with the internal values or initial values stored beforehand, a particular one of the variables stored beforehand is used for the operation by the position control unit, or a reference value of the speed control is adjusted in accordance with a particular one of the variables stored beforehand.