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:
May. 08, 1990
Filed:
Jan. 23, 1989
Keiichi Kohno, Yokohama, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
In a servo control system having a coarse control unit and a fine control unit, a differential gain is changed temporarily during a short period at an initial state of fine control to shorten a settling time and to reduce overshoot. The servo control system includes a controlled system including a controlled object and a drive unit, a unit for controlling a speed of the controlled object to move and position the same to or adjacent a reference position, and a unit having a differential control circuit and for controlling a position of the controlled object to position the controlled object to the reference position, after the speed control unit moves the controlled object to or adjacent to the reference position. A differential gain of the differential control circuit is selected from at least two values, a first of which is used at an initial state and a second of which is used after the initial state. The servo control system is applicable to a disc system, a printer, etc.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile