Patent ID: 8556227

Claim:
Actuation device with a piezoelectric flexural transducer element ( 2 ) being pivotally mounted in a housing ( 15 ) for carrying out an actuation deflection ( 14 ), comprising a fluid bearing ( 5 ) associated with a portion of the flexural transducer element ( 2 ), the fluid bearing including a first surface ( 7 ), which is associated with the flexural transducer element ( 2 ), a second surface ( 8 ), which is associated with the housing ( 15 ), and an amount of viscous power transmitting fluid ( 6 ) trapped in a gap between the two surfaces, a first reference stop ( 10 ) in housing 15 to define a reference position (Zref) for the actuator deflection ( 14 ), a force applying means pressing on the flexural transducer element ( 2 ) to maintain flexural transducer element ( 2 ) and first reference stop ( 10 ) in contact in a reference state.