Ghost image prevention element for imaging optical system
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United States of America Patent
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Aug 31, 2004
Grant Date -
Mar 27, 2003
app pub date -
Sep 18, 2002
filing date -
Sep 26, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An imaging optical system includes at least one ghost image prevention element. Ghost images are prevented even when the imaging optical system includes an optical element that has at least one planar surface that is generally orthogonal to an optical axis of the imaging optical system, and is located in a light flux area with at least a central portion of the light flux area being generally parallel to the optical axis. The ghost image prevention element is especially useful in video cameras and digital cameras that use an image sensor having a planar surface that exhibits a high coefficient of reflection. The ghost image prevention element includes one planar surface, that is 'tightly bound' to the planar surface of the optical element, and another surface that is curved so as to satisfy a given condition. The curved surface diffuses light that would otherwise contribute to a ghost image.
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