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:
Apr. 25, 1995
Filed:
Dec. 29, 1993
Bradley S Jadrich, Rochester, NY (US);
David K McCauley, Henrietta, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
A method and apparatus is disclosed for adapting a low precision lead screw to perform in a high precision application by compensating for cyclical positioning errors that are produced by the lead screw. A stage assembly driven by a stepper motor is individually characterized and its inherent cyclical positioning error is stored in a memory device. The memory device is used to control a driving circuit that controls an operation of the stepper motor. The stepper motor is driven in a non-uniform manner that is complementary to a pattern of cyclical positioning errors in the stage assembly. As a consequence, a stage, driven by the lead screw, moves in a uniform manner. The system is disclosed in the context of a printer in which a receiver is driven at a uniform rate by an inexpensive low precision lead screw.