Device for automatically controlling diaphragm aperture

Details Device for automatically controlling diaphragm aperture Device for automatically controlling diaphragm aperture

1978-08-10

1980-07-01

Gellner, Michael L.

354 43, G03B 708

Patent

active

042103932

ABSTRACT:
An automatic diaphragm aperture controlling device which includes an exposure information pulse generation circuit to generate a pulse in a number corresponding to an aperture value to be controlled, the obtained pulses being based on exposure informations such as a scene brightness or the like. A counter circuit is provided for counting the output of the exposure information pulse generation circuit, together with an aperture value pulse generation circuit for generating pulses in a number corresponding to an aperture value of a diaphragm stopped down in association with a diaphragm drive, and diaphragm fixing means for fixing the diaphragm aperture which fixing means is actuated when an aperture value pulse number is coincident with an exposure information pulse number. The aperture value pulse generating circuit includes a light source, a photo-responsive element, and an intermittent light transmitter adapted for movement between the light source and the photoresponsive element in coupled relationship to the activation of the diaphragm.

REFERENCES:
patent: 4034383 (1977-07-01), Mashimo et al.
patent: 4058816 (1977-11-01), Nobusawa

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