Patent
1980-03-10
1981-11-24
Gellner, Michael L.
G03B 310
Patent
active
043020844
ABSTRACT:
A focusing device for use with photographic cameras and the like. This invention uses a light source such as an electronic flash to direct light toward an object to be photographed. When the amount of flash light reflected by the subject reaches a predetermined level, a quench circuit is activated which terminates the light emanating from the light source. A timer measures the elapsed time between the depression of the body release and the generation of the quench signal. Converter means translate the measured time interval into a range signal that is functionally related to the distance between the focusing device and the subject. The range signal may then be used to adjust a camera component such as a lens or may be used to control visual indicia that present readings to the operator indicative of range.
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Greenwald Rogers J.
Matteson Lawrence J.
Arndt D. R.
Eastman Kodak Company
Gellner Michael L.
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