Photography – Camera detail – Shutter
Patent
1994-10-04
1997-10-14
Perkey, W. B.
Photography
Camera detail
Shutter
396248, G03B 908
Patent
active
056781067
ABSTRACT:
A driving device for a piezoelectric actuator, in which a voltage is applied to a piezoelectric actuator to generate a mechanical deformation therein, thus actuating a mechanical system. In an aspect, the piezoelectric actuator is at first given a voltage of inverse polarity, for generating a displacement in an opposite direction, and then given a voltage of forward polarity, for generating a displacement in the normal functioning direction, thereby actuating the mechanical system. Displacement and acceleration become larger, as the displacement of the actuator takes place from a position in the inverse direction. In another aspect, the electrical insulation state of the piezoelectric actuator is detected and, if deteriorated, the destruction of insulation is prevented by an alarm generation and/or inhibition of voltage application in an embodiment, the insulation state is identified from the ambient humidity of the actuator. In another embodiment, if the detected humidity is at a high level that may induce destruction of insulation, the piezoelectric actuator is driven with a low voltage, in order to dehumidify by heat generation. The piezoelectric actuator may be used in a shutter control device for a camera.
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Goto Tetsuro
Hasuda Masanori
Katayama Akira
Tanabe Yoshiaki
Nikon Corporation
Perkey W. B.
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