Ambient light rejection filter
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United States of America Patent
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Dec 13, 2011
Grant Date -
Dec 6, 2007
app pub date -
Feb 21, 2007
filing date -
Feb 22, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
A fingerprint reader is described. The fingerprint reader includes an illumination source that produces light and a camera. An optical window is also part of the reader. The window is positioned so that light from the illumination source passes through the optical window and then is reflected to the camera for imaging a person's fingerprint. A filter may be positioned on or proximate to the optical window. The filter prevents ambient light from reaching the camera. In some situations, the filter will be a dielectric mirror, a dielectric filter, a holographic mirror, a holographic filter, a dichroic mirror or a dichroic filter.
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