Camera shutter using an electrostrictive strain element as a dri

Details Camera shutter using an electrostrictive strain element as a dri Camera shutter using an electrostrictive strain element as a dri

1987-12-22

1988-12-13

Gellner, Michael L.

354265, G03B 914

Patent

active

047914424

ABSTRACT:
A camera shutter using an electrostrictive strain element as a driving source wherein, in order to make it possible to make the driving voltage small and to make an accurate exposure, when the shutter is released, first a reverse voltage is applied to an electrostrictive strain element to drive a shutter blade opening and closing member in the direction of completely closing the shutter blades, then the charge accumulated in the electrostrictive strain element is discharged and finally a forward voltage is applied to the electrostrictive strain element to open the shutter blades.

REFERENCES:
patent: 4234245 (1980-11-01), Toda et al.

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