Driving unit using electrostrictive element

Details Driving unit using electrostrictive element Driving unit using electrostrictive element

1988-02-22

1989-07-25

Perkey, W. B.

Electrical generator or motor structure

Dynamoelectric

Rotary

310317, 310330, G03B 700, H01L 4108

Patent

active

048518719

ABSTRACT:
A driving unit using an electrostrictive element drives mechanical members such as, for example, a diaphragm and a shutter or a shutter blade having the function of a diaphragm blade by deformation of the electrostrictive element produced when a voltage is applied to the element, and is adapted to obtain a desired deformation quantity from the electrostrictive element regardless of the magnitude of an initial deformation quantity due to hysteresis of the element. A reference switch such as, for example, a photointerrupter operates when a predetermined reference deformation quantity is obtained in an area where the deformation quantity changes linearly in respect to variation of an applied voltage. A voltage obtained by superposing a voltage corresponding to a difference between a desired deformation quantity of the element and the reference deformation quantity on a voltage applied to the electrostrictive element when the reference switch is operated is applied to the electrostrictive element so that a desired deformation quantity is obtained regardless of the magnitude of the initial deformation quantity.

REFERENCES:
patent: 3426661 (1969-02-01), Wick et al.
patent: 3709134 (1973-01-01), Kitai
patent: 3801822 (1974-04-01), Numata
patent: 4174893 (1979-11-01), Burgarella et al.
patent: 4263527 (1981-04-01), Comstock
patent: 4534638 (1985-08-01), Hirohata et al.
patent: 4609275 (1986-09-01), Ishiguro
patent: 4663555 (1987-05-01), Yoshihiro

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