Camera exposure time control circuit

Details Camera exposure time control circuit Camera exposure time control circuit

1980-01-17

1981-12-22

Hix, L. T.

354 24, 354 60A, 354 60L, G03B 1718, G03B 7093

Patent

active

043067859

ABSTRACT:
A combined manual and automatic exposure time control circuit for a camera in which automatic exposure data produced through photometric techniques and manual exposure data set manually are coupled through a switching circuit to a time determination circuit which controls the camera exposure time. The automatic exposure data is produced by a calculation circuit which receives inputs relating to the logarithmic compression values of the object brightness, the film sensitivity, aperture value and exposure setting to thereby digitally calculate the proper exposure time. The output of the calculator is selectively coupled through a switching circuit along with the analog-to-digitally converted manual exposure time setting data to an expansion time determination circuit. The two analog signals are also converted to digital form and selectively coupled through a second switching circuit along with the direct manual exposure data to a display unit with selection being made in accordance with whether a manual or an automatic mode of operation is chosen.

REFERENCES:
patent: 4089012 (1978-05-01), Kawasaki
patent: 4171884 (1979-10-01), Tokutomi

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