Method and apparatus for detecting focus of moving images with tilted plane detector and time delay means
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United States of America Patent
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Jul 11, 1995
Grant Date -
N/A
app pub date -
Jun 7, 1994
filing date -
Jun 7, 1994
priority date (Note) -
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Abstract
A focus detecting system is provided for detecting the focus condition of a moving image in an optical system. The focus detecting system includes means for detecting the sharpness of a plurality of sub-images formed along a plurality of sight lines by the optical system, the detecting means including a plurality of detectors arranged in a plane tilted with respect to an optical axis of said optical system and the detectors aligned with a direction of motion of the image formed by the optical system such that the sub-images are detected at a plurality of positions in the vicinity of best focus of the optical system. A time delay is provided between the sub-images such that the sub images represent the same portion of a scene being imaged by the optical system. A position of best focus for said optical system is calculated from the sub-image data.
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