Lens controlling apparatus and image-taking apparatus with focus control based on first and second signals derived from different focus control methods
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United States of America Patent
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Dec 30, 2008
Grant Date -
Aug 25, 2005
app pub date -
Feb 18, 2005
filing date -
Feb 20, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
A lens controlling apparatus is disclosed, which is capable of preventing an execution of irrelevant AF control in a combination of TV-AF method and an AF method other than the TV-AF method. The lens controlling apparatus comprises: a first signal generating section generating a first signal showing a contrast state of an object image on the basis of a predetermined frequency component of a signal; a second signal generating section generating a second signal by a focus detecting method different from that in the first signal generating section; and a controller, which selects one of a first focus control operation based on the first signal and a second focus control operation based on the second signal in accordance with each change amount of the first and second signals.
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