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US 7,402,937 B2Granted
Piezoelectric actuator
AssigneeRobert Bosch GmbH
InventorBertram Sugg
Life of this patent
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Abstract
A piezoelectric actuator, for example for actuating a mechanical component, has a multilayered structure of piezoelectric layers and, in a piezoelectrically active region, can be acted on with an electrical voltage by means of internal electrodes that are situated between the layers. The layer structure of the piezoelectric actuator includes inactive regions; at least the top part or bottom part, as an inactive region without internal electrodes, is comprised of a material whose dielectric constant is less than the dielectric constant of the active region.
Claims11
In a piezoelectric actuator, comprising
- a multilayered structure of piezoelectric layers, having a piezoelectrically active region, with internal electrodes that are situated between the layers and can be acted on with an electrical voltage, and having
- inactive regions without internal electrodes in the top part and bottom part of the piezoelectric actuator, the improvement wherein
- the dielectric constant of at least the top part or bottom part, as an inactive region, is less than the dielectric constant of the active region,
- wherein the inactive regions and the active region are manufactured out of the same ceramic base substance and an additional doping agent is added to the inactive regions to minimize the dielectric constant.
1 more element
Dependencies are inferred from the claim text.