Diaphragm controlling device for a camera

Details Diaphragm controlling device for a camera Diaphragm controlling device for a camera

1997-02-07

1998-06-16

Gray, David M.

Photography

Exposure control circuit

Diaphragm function only

396508, 396258, G03B 708

Patent

active

057686394

ABSTRACT:
A diaphragm control device for a camera comprises a diaphragm driving mechanism that drives the diaphragm, a diaphragm position detection device which calculates the opening diameter of the diaphragm from the standard opening diameter and transmits the opening diameter as a pulse, a diaphragm connection mechanism that fixes the opening diameter of the diaphragm, a recording device that records information concerning a change in the generation cycle, which has been measured in advance, and a control that controls the driving of the diaphragm driving mechanism and of the diaphragm connection mechanism, based on the output of the diaphragm position detection device. The control determines the change in the generation cycle from the total number of pulses generated up until the generation of the current pulse by referring to information in the recording device, and determines the time that indicates the connecting action in the diaphragm connection mechanism.

REFERENCES:
patent: 4381889 (1983-05-01), Sahara et al.
patent: 4396271 (1983-08-01), Hiraike
patent: 4429973 (1984-02-01), Kawasaki et al.
patent: 4514075 (1985-04-01), Negishi et al.
patent: 4874233 (1989-10-01), Yamamoto et al.
patent: 4989030 (1991-01-01), Naka et al.
patent: 5196940 (1993-03-01), Sato
patent: 5325149 (1994-06-01), Kawahara
patent: 5430519 (1995-07-01), Shimada et al.

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