Circuit for digitally computing exposure control information

Details Circuit for digitally computing exposure control information Circuit for digitally computing exposure control information

1976-07-29

1978-08-15

Adams, Russell E.

354 50, 354 60A, G03B 708

Patent

active

041077040

ABSTRACT:
A circuit for digitally computing the information necessary for controlling the shutter speed or aperture in an automatically exposure-controlled camera is based on a unique algorithm. Based on this algorithm, the shutter speed, for example, can be computed by first generating a number of pulses corresponding to the preset aperture and film speed and deciding to which of three predetermined values this number corresponds. Then the brightness value, which has been separately measured, is repeatedly doubled according to the decision made with respect to the number of pulses generated. The resulting value is exponentially compensated as required to obtain the shutter speed.

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