Piezoelectric type actuator having stable resonance frequency

Details Piezoelectric type actuator having stable resonance frequency Piezoelectric type actuator having stable resonance frequency

1998-03-24

2000-08-15

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310324, 310328, 310330, H01L 4104

Patent

active

061041270

ABSTRACT:
A piezoelectric type actuator is composed of a vibration element, in which a piezoelectric element is attached on a vibration plate, an upper member and a lower member provided to hold the piezoelectric element. The vibration plate, the upper member, the lower member are made of the material having substantially a same thermal expansion coefficient. Also, a pressure applying mechanism is provided to apply a holding pressure to the lower member such that the vibration element is held with the holding pressure by the lower member and the upper member.

REFERENCES:
patent: 3700938 (1972-10-01), Bryant
patent: 3731124 (1973-05-01), Bryant
patent: 3746898 (1973-07-01), Austin et al.
patent: 4420706 (1983-12-01), Siebold et al.
patent: 4947075 (1990-08-01), Maury et al.
patent: 4965483 (1990-10-01), Abe et al.
patent: 5376860 (1994-12-01), Sato
patent: 5886456 (1999-03-01), Stubbs et al.
Sounder Unit, by Baumhauer et al, Western Electric Technical Digest No. 59 (Jul. 1980) p. 1.

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