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US 7,922,385 B2Granted
Piezoelectric drive device and electronic device
AssigneeSeiko Epson Corporation
InventorShoichi Nagao
Life of this patent
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Abstract
A piezoelectric drive device has a piezoelectric actuator that has a vibrator with a piezoelectric element, and a rotor that is rotated by the vibrator, an elastic device that can store the rotational energy of the rotor as elastic energy, and a driven body that is rotated by the elastic energy stored by the elastic device.
Claims17
A piezoelectric drive device comprising:
- a piezoelectric actuator that has a vibrator with a piezoelectric element and a rotor configured to be rotated by the vibrator;
- an elastic device having elasticity and configured to store rotational energy of the rotor;
- a driven body configured to be rotated by the elastic device;
- a rotor transmission wheel;
- and
- a release limiting unit configured to hold initial deflection of the elastic device and configured between the rotor transmission wheel to which rotational energy is transmitted and the driven body, or between the rotor and driven body,
- the elastic device being disposed between the rotor and the driven body.
4 more elements
Dependencies are inferred from the claim text.