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:
Aug. 20, 1996
Filed:
Dec. 22, 1994
Applicant:
Inventor:
Samuel K Doran, Wappingers Falls, NY (US);
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G05D / ;
U.S. Cl.
CPC ...
31856819 ; 318625 ; 318632 ; 7448 / ;
Abstract
A stage positioning apparatus including a stage and a servo control system. The servo control system includes a compensation circuit. The compensation circuit determines the cosine of the angle between the off-axis drive bar and the direction of travel. A voltage, proportional to the cosine, is multiplied by the on-axis drive error signal to develop an off-axis compensation voltage. Each drive's new error signal is compensated by its respective off-axis compensation voltage.