Electronic exposure control apparatus

Details Electronic exposure control apparatus Electronic exposure control apparatus

1977-12-27

1981-01-20

Gellner, Michael L.

354 38, G03B 7097

Patent

active

042459001

ABSTRACT:
An electronic exposure control apparatus for a camera includes a setting means to set the exposure factor, a compression means connected to the setting means, for compressing the above-mentioned exposure factor logarithmically and an analogue-digital conversion means, being connected to said compression means, and generating a pulse number which corresponds to the output from the compression means. Also included is a first counter, which is connected to the output of the above-mentioned analogue-digital conversion means, for counting the pulse number from the above-mentioned analogue-digital conversion means, a pulse generating means, a binary counter having plural number of bits and connected to the output of the above-mentioned pulse generating means, wherein the counter counts the pulse number from the above-mentioned pulse generating means in association with shutter release, and the output of the counter is connected to the first counter for resetting the memorized content of the first counter. A coincidence detection means is connected to the output of the binary counter, wherein the means generates signals when the memorized content of the first counter is reset, and a control means is connected to the above-mentioned coincidence detection means, wherein the opening and closing of shutter is controlled by the signal from the above-mentioned coincidence detection means.

REFERENCES:
patent: 3703130 (1972-11-01), Watanabe
patent: 3748979 (1973-07-01), Wada
patent: 3824608 (1974-07-01), Toyoda

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