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:
Nov. 11, 1997
Filed:
Sep. 21, 1995
Timothy N Chang, Pompton Plains, NJ (US);
New Jersey Institute of Technology, Newark, NJ (US);
Abstract
An apparatus and method for utilizing piezoelectric devices for precise positioning purposes without having to endure the detrimental effects of hysteresis. The apparatus and method involving driving a pair of piezoelectric stacks with complementary low amplitude, high frequency dither signals produced by an oscillating source. The complementary low amplitude, high frequency dither arrangement, referred to as an intermediate dither, is self-compensating so that no residual dither is transmitted to a load attached to one of the stacks. Furthermore, the dithering of each stack results in a virtual elimination of hysteresis in the material of the piezoelectric stacks.