Device for driving shutter

Details Device for driving shutter Device for driving shutter

1989-10-11

1991-04-16

Adams, Russel E.

354435, G03B 708

Patent

active

050086995

ABSTRACT:
In a device for driving a shutter having a bimorph element displaceable or deformable by the application of a voltage thereto, and so constructed as to open and close the shutter by using the displacing or deforming effect of the bimorph element, the device comprises a first switching means for short-circuiting the bimorph element at a usual time and a second switching means for releasing the bimorph element from the short-circuited state caused by the first switching means only at the time of opening the shutter and at the same time charging the bimorph element with a voltage from an electric source for the bimorph element, so that the shutter can be surely closed at the usual time.

REFERENCES:
patent: 4290678 (1981-09-01), Marcus
patent: 4303324 (1981-12-01), Marcus
patent: 4464039 (1984-08-01), Ishida
patent: 4595854 (1986-06-01), Yano et al.
patent: 4609275 (1986-09-01), Ishiguro
patent: 4630916 (1986-12-01), Ishiguro et al.
patent: 4799078 (1989-01-01), Hayama
patent: 4851871 (1989-07-01), Ooe et al.
patent: 4884090 (1989-11-01), Tanaka et al.
patent: 4920373 (1990-04-01), Tominaga et al.

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