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. 08, 2011
Filed:
Aug. 11, 2007
Hannes Wirtl, Schongau, DE;
Hannes Wirtl, Schongau, DE;
Festo AG & Co. KG, Esslingen, DE;
Abstract
An electronic control device for a piezo-ceramic bending transducer designed as a trimorph, wherein a first voltage divider consisting of two resistor branches and powered by a first voltage source (U) is provided, whose first resistor branch connects the first piezo-ceramic plate of the trimorph to its spacer layer. In addition, a second voltage divider is provided that consists of two resistor branches and the first resistor branch thereof connects the second piezo-ceramic plate of the trimorph to its spacer layer. The second resistor branch of the first voltage divider also forms the second resistor branch of the second voltage divider. Thus, by means of one voltage source, the one piezo-ceramic plate has an applied tensile stress and the other piezo-ceramic plate has an applied compressive stress, so that the flexural motion is reinforced by the two piezo-ceramic plates and thus only a small voltage has to be applied.