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:
Jan. 11, 2000
Filed:
Feb. 01, 1993
Eiji Okamura, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A positioning control system is provided with a controlled device which has resonance characteristic and is positioned at a designated position; position detector for detecting a moved position of the controlled device in accordance with a servo signal or the like; arithmetic controller such as a DSP (Digital Signal Processor) adapted to generate a drive signal based on a position detection signal from the position detector and the designated position; and a drive adapted to move the controlled device in accordance with the drive signal from the arithmetic controller. The arithmetic controller includes a low pass filter which has an abrupt slope and a discontinuous pole in the gain-frequency characteristics thereof to suppress the resonance characteristics. Preferably, the low pass filter is constituted by a combination of a notch filter and an elliptical function filter.