Piezoelectric actuator

US7271526B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Friedrich Boecking · Stuttgart, DE
• Ulrich Schoor · Stuttgart, DE
• Bertram Sugg · Gerlingen, DE

Key dates

• Filing date: Oct 10, 2003
• Grant date: Sep 18, 2007
• Expiry date: Feb 11, 2024

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10N30/503

Abstract

A piezoelectric actuator for actuating a mechanical component, having a multilayered structure of piezoelectric layers with inner electrodes disposed between them and contacting outer electrodes on alternating sides and the piezoelectric actuator has chamfered corners or edges. In the region of the corners or edges, on the sides of the piezoelectric actuator on which the inner electrodes with alternating polarities are routed to the respective outer electrodes, the inner electrodes have a contour that makes it possible to achieve a lower field intensity between the inner electrodes of alternating polarities in the structure of piezoelectric layers. This is achieved by virtue of the fact that on the side that does not contact the outer electrodes, the edge has an obtuse angle (∝) or is rounded.