Patent
1979-04-16
1981-02-17
Griffin, Donald A.
354 29, 354 60A, 354227, 350331R, 350336, G03B 7097, G02F 113
Patent
active
042511410
ABSTRACT:
During the course of an exposure, the camera's exposure aperture progressively increases in size and then is blocked to terminate the exposure in response to a terminate-exposure signal. A light-dependent pulse generator including a photoelement exposed to scene light generates a pulse train whose pulse repetition frequency varies as a function of scene light. A light-totalizing counter receives and counts pulses of such pulse train during the course of an exposure and generates a terminate-exposure signal when a predetermined number of pulses has been counted. A frequency-modifying circuit is operative as the exposure aperture progressively increases in size during an exposure for effecting a corresponding and compensatory progressive increase of the light-dependent repetition frequency of the pulses counted by the counter means.
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Stemme Otto
Wagensonner Eduard
AGFA-Gevaert A.G.
Griffin Donald A.
Perkey William B.
Striker Michael J.
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