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:
Jan. 14, 2003
Filed:
Apr. 18, 2001
Rudolf Heinz, Renningen, DE;
Alexander Hedrich, Stuttgart, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A piezoelectric actuator, for example for actuating a mechanical component, is proposed, which has a multilayered structure of piezoelectric layers and internal electrodes ( ) disposed between them. As a conductive surface, a first external electrode ( ) is affixed to a respective side surface and is contacted by the respective internal electrodes ( ), and a second net-like or woven cloth-like external electrode ( ) is disposed on the first external electrode ( ). In the regions of the piezoelectric layers, which have respective internal electrodes ( ) that are respectively contacted on opposite sides from one another, there is a passive zone ( ) without an internal electrode layer. The ceramic piezoelectric material—at least in the passive zone ( )—and the material of the second external electrode ( ) have almost the same thermal expansion coefficient, by means of which the influence of mechanical stresses in the piezoelectric actuator can be reduced.