Camera focus detecting device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Sep 14, 1982
Grant Date -
N/A
app pub date -
Feb 4, 1980
filing date -
Feb 13, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A focus detecting device for a camera in which at least first and second groups of light receiving elements are disposed in planes parallel to each other and to the plane of the film in the camera. The absolute values of the difference between the signals from adjacent elements in each group are summed from which is determined the amount of high frequency components in the frequency spectrum of the image being photographed. From this, a processing circuit produces a signal representative of correct focalization when the amounts of the high frequency components are higher than a predetermined level and are equal to each other.
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Family
International Classification(s)
Cited Art Landscape
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