Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2007-06-04
2008-10-07
Dougherty, Thomas M (Department: 2834)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C417S413200
Reexamination Certificate
active
07432637
ABSTRACT:
A piezoelectric drive device2includes cases4and5and a drive device body6. The drive device body6includes a displacement expanding plate10, a biasing unit15and piezoelectric elements17and18. The displacement expanding plate includes a body110biased to rotate by the biasing unit15, and a displacement expanding portion120expanding a displacement when the piezoelectric elements17and18are expanded to be displaced relative to the body in a direction perpendicular to an expanding direction of the piezoelectric elements. In a state where no voltage is applied to the piezoelectric element, a first driven object31is moved by the body that is biased by the biasing unit. When a voltage is applied to the piezoelectric element17, a second driven object32is moved by the displacement portion120. When the voltage is further applied to the piezoelectric element17in a state where the second driven object32abuts on an object such that the displacement of the displacement expanding portion is expanded, the body110and the first driven object31are moved against a biasing force of the biasing unit in a direction opposite to a biasing direction of the biasing unit.
REFERENCES:
patent: 5712524 (1998-01-01), Suga
patent: 6294859 (2001-09-01), Jaenker
patent: 2006-029314 (2006-02-01), None
Dougherty Thomas M
Neuberg Company Limited
Rankin , Hill & Clark LLP
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