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:
Oct. 19, 2021
Filed:
Apr. 24, 2017
Physik Instrumente (Pi) Gmbh & Co. KG, Karlsruhe, DE;
William Culpi, Lake Forest, CA (US);
Physik Instrumente (PI) GmbH & Co. KG, Karlsruhe, DE;
Abstract
A piezo-electric motorincludes an actuation portion including an actuation surfaceand a piezo stackthat is operable in response to the application of a voltage to move the actuation surface along an actuation axisbetween a retracted position and an extended position. A spring strappartially surrounds the actuation portion and is operable to bias the actuation surface toward the retracted position and a movable portionis frictionally engaged with the actuation surface. The voltage is selected such that the movable portion sticks to the actuation surface as the actuation surface moves toward one of the retracted position and the extended position and slips on the actuation surface as the actuation surface moves toward the other of the retracted position and the extended position.