Diaphragm apparatus for camera

Details Diaphragm apparatus for camera Diaphragm apparatus for camera

1988-05-18

1989-08-29

Adams, Russell E.

354457, 3542711, G03B 902

Patent

active

048622079

ABSTRACT:
A diaphragm apparatus is disclosed including a piezoelectric actuator of bimorph type. A drive circuit associated with the actuator applies a voltage corresponding to a diaphragm aperture which is calculated in accordance with a photometric value to the actuator to produce a displacement thereof, which is transmitted through a diaphragm operating member to open or close diaphragm blades so as to control a diaphragm aperture. The drive circuit applies a reset voltage which resets the diaphragm blades to a predetermined reset condition, to the piezoelectric actuator, and after the resetting operation, it applies a voltage corresponding to a given diaphragm aperture to the piezoelectric actuator.

REFERENCES:
patent: 4609275 (1986-09-01), Ishiguro

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