Automatic focus adjusting device
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United States of America Patent
Stats
-
May 18, 1993
Issued Date -
N/A
app pub date -
Feb 11, 1992
filing date -
Mar 28, 1989
priority date (Note) -
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status (Latency Note)
Importance
Abstract
An automatic focus adjusting device comprises an image sensor arranged to convert into a video signal an object image formed on its image sensing plane by a photo-taking lens optical system and to produce the video signal; a circuit which detects a high-frequency component included in the video signal; a circuit which detects from the video signal the degree of sharpness of the image on the basis of the width of the edge part of the image; a driving circuit which changes the position of the optical system relative to the image sensing plane in the direction in which the detection output of the high-frequency component and that of the degree of sharpness increase; and a control circuit which controls the driving speed of the driving circuit according to the detection output of the degree of sharpness.
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