Patent
1980-10-31
1982-04-13
Adams, Russell E.
354 33, 354 60F, G03B 708
Patent
active
043244629
ABSTRACT:
A circuit for controlling an exposure time of a camera which operates depending on whether or not an electronic flash used with the camera is charged and ready for operation. An arithmetic operation circuit operates upon signals representing object brightness, film sensitivity, and aperture value and exposure factor compression values to calculate an automatic exposure time. The output of the arithmetic operation circuit is multiplexed with the output of a manual exposure time setting circuit to an expansion time determination circuit. The manual exposure time setting device output is multiplexed through a first gating means with the output of a counter which operates in response to an oscillator. Multiplexed outputs are coupled to an input port of a digital-to-analog converter the output of which is coupled to one input of an analog-to-digital converter and the other input of which is coupled to the output of the arithmetic operation circuit. The output of the analog-to-digital converter is multiplexed with the output of the first gating means to operate a display device.
REFERENCES:
patent: 4084166 (1978-04-01), Kawasaki et al.
patent: 4092653 (1978-05-01), Kawasaki et al.
patent: 4112439 (1978-09-01), Kawasaki et al.
patent: 4156562 (1979-05-01), Kawasaki et al.
patent: 4225218 (1980-09-01), Nomata
Suzuki Koji
Tano Eiichi
Adams Russell E.
Asahi Kogaku Kogyo Kabushiki Kaisha
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