Piezoelectric actuator and method of producing the same
First Claim
1. A piezoelectric actuator comprising:
- a case having a bottomed cylindrical shape including an extendable and contractible portion formed at least at a part of the cylindrical case in an axial direction thereof;
a stacked piezoelectric device received in the cylindrical case;
a housing provided with a pair of external electrodes for power supply and connected to an open end of the cylindrical case;
a molding resin having an electric insulation property and provided on an outer circumferential surface of the piezoelectric device between the piezoelectric device and the cylindrical case; and
a sleeve having an electric insulation property and provided on the molding resin, the sleeve being formed by a plurality of circumferentially separated sleeve segments assembled together into a substantially cylindrical shape.
1 Assignment
0 Petitions
Accused Products
Abstract
A piezoelectric actuator includes a stacked piezoelectric device received in a cylindrical case having an extendable and contractible portion formed at least at an axial part thereof, and a housing provided with a pair of external electrodes for power supply and connected to an open end of the cylindrical case. Between the piezoelectric device and the cylindrical case, a molding resin having an electric insulation property is provided on an outer circumferential surface of the piezoelectric device, and a sleeve having an electric insulation property is provided on the molding resin. The sleeve is formed by a plurality of circumferentially separated sleeve segments assembled together into a substantially cylindrical shape.
6 Citations
17 Claims
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1. A piezoelectric actuator comprising:
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a case having a bottomed cylindrical shape including an extendable and contractible portion formed at least at a part of the cylindrical case in an axial direction thereof;
a stacked piezoelectric device received in the cylindrical case;
a housing provided with a pair of external electrodes for power supply and connected to an open end of the cylindrical case;
a molding resin having an electric insulation property and provided on an outer circumferential surface of the piezoelectric device between the piezoelectric device and the cylindrical case; and
a sleeve having an electric insulation property and provided on the molding resin, the sleeve being formed by a plurality of circumferentially separated sleeve segments assembled together into a substantially cylindrical shape. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of producing a piezoelectric actuator comprised of a case having a bottomed cylindrical shape including an extendable and contractible portion formed at least at a part of the cylindrical case in an axial direction thereof, a stacked piezoelectric device received in the cylindrical case, and a housing provided with a pair of external electrodes for power supply and connected to an open end of the cylindrical case, the method comprising the steps of:
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applying a molding resin having an electric insulation property to at least one of an outer circumferential surface of the piezoelectric device and inner circumferential surfaces of a plurality of circumferentially separated sleeve segments having an electric insulation property;
placing the sleeve segments on the outer circumferential surface of the piezoelectric device in a circumferentially mated condition with the molding resin interposed between the piezoelectric device and the sleeve segments to thereby assemble the sleeve segments together into a substantially cylindrical sleeve;
curing the molding resin;
placing the piezoelectric device into the cylindrical case; and
placing the housing in such a manner as to close an open end of the cylindrical case and joining the housing and the case together. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification