Patent
1977-09-26
1979-05-15
Adams, Russell E.
354 29, 354238, G03B 708
Patent
active
041545168
ABSTRACT:
An analog signal whose value is proportional to scene-light intensity is converted into a multi-bit digital signal of corresponding value. A train of clock pulses is generated, having a repetition frequency greater than the reciprocal of the shortest exposure duration to be establishable by the control system. The digital light-intensity signal is continually totalized during the course of an exposure by a clocked totalizer which operates in synchronism with the train of clock pulses and produces during the course of the exposure a multi-bit digital totalized-light signal. A comparator has a first input at which it receives the totalized-light signal and a second input at which it receives a digital total-required-light signal. The latter signal is furnished by an addressable storage which stores a plurality of total-required-light signals of different respective values, corresponding to different exposure programs. A selector operated by the photographer or automatically addresses the addressable memory, causing the latter to furnish to the comparator the total-required-light signal appropriate for the exposure program involved.
REFERENCES:
patent: 3824608 (1974-07-01), Toyoda
patent: 3900855 (1975-08-01), Stempeck
patent: 3995284 (1976-11-01), Kitaura et al.
patent: 4040067 (1977-08-01), Kondo
Stumpf Friedrich
Wagensonner Eduard
Wagner Karl
Adams Russell E.
AGFA-Gevaert A.G.
Striker Michael J.
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