Patent ID: 6291929
Filing Date: 2001-09-18
Classification: H01L

Abstract:
A piezoelectric actuator for actuating control valves or injection valves in internal combustion engines of motor vehicles, having a piezoelectric actuator body (1) in the form of a multi-layer laminate of stacked layers of piezoelectric material and electrically conductive layers, acting as electrodes, located between them, said actuator body having face ends in which one face end is fixed to a stationary metal actuator base (6), the other face end borders a metal retaining plate (4) that is movable with an actuator stroke, and the piezoelectric material has blind metal electrodes (10, 11) on both face ends, each of which blind metal electrodes is located in a passive piezoceramic cover layer (8, 9) defined between the respective outermost active piezoceramic layer and either the movable retaining plate (4) on the one hand or the actuator base (6) on the other hand.