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US 7,732,980 B2Granted
Electromechanical conversion element, vibration actuator, vibration actuator driving device, lens barrel and camera
AssigneeNikon Corporation
InventorToshikazu Morioke
Life of this patent
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Abstract
To provide an electromechanical conversion element, a vibration actuator, a vibration actuator driving device, a lens barrel and a camera, which facilitate the achievement of the desired drive characteristics. An electromechanical conversion element comprising: a piezoelectric body having a polarization part polarized in a certain direction; and a plurality of separately formed electrodes on a continuous region of the polarization part.
Claims21
An electromechanical conversion element comprising:
- a piezoelectric body of an annular shape, having a polarization part polarized in a certain direction;
- and
- a plurality of electrodes formed on the piezoelectric body, separated in a peripheral direction of the annular shape by regions along a radial direction of the annular shape of the piezoelectric body,
- wherein the plurality of electrodes are respectively separated by a plurality of regions in the radial direction, and the polarization parts respectively corresponding to the plurality of regions have a same polarization direction.
1 more element
Dependencies are inferred from the claim text.