1983-01-24
1984-01-03
Adams, Russell E.
G03B 708
Patent
active
044239351
ABSTRACT:
An automatic focusing device having a signal processing circuit for providing a focusing signal and a defocusing signal, or drive direction signal, to move the photographing lens to a focusing position the device is provided with a hunting preventing circuit in which, even if the drive direction signal is developed after it has been determined that the lens is focused on the object, the drive direction signal is made ineffective for a period of time which is shorter when the object brightness is high and longer where the brightness is low, whereby the hunting phenomenon with the lens which is liable to occur with a low brightness is positively prevented.
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Eguchi Mitsuo
Ichino Nobuyuki
Kikuchi Yoshimi
Adams Bruce L.
Adams Russell E.
Burns Robert E.
Lobato Emmanuel J.
Mamiya Koki Kabushiki Kaisha
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