Automatic focusing device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 3, 1984
Issued Date -
N/A
app pub date -
Jan 24, 1983
filing date -
Nov 21, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
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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Cited Art Landscape
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