Exposure time controlling system

Details Exposure time controlling system Exposure time controlling system

1979-03-01

1980-10-21

Gellner, Michael L.

354 24, 354 50, 354234, G03B 708, G03B 962

Patent

active

042290880

ABSTRACT:
An exposure time controlling system includes a circuit for producing an APEX shutter speed signal which is applied to a first discriminator for briefly classifying the APEX shutter speed signal into four classes and also to a second discriminator for sub-classifying the APEX shutter speed signal. A pulse generator is provided for producing pulse signal having a frequency determined by the class and a counter is provided for counting the pulses for a number of times determined by the sub-class. A shutter mechanism is opened when the counter starts to count and is closed when the counter finishes counting the pulses.

REFERENCES:
patent: 3995284 (1976-11-01), Kitaura et al.
patent: 4139289 (1979-02-01), Yamada et al.

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