Optical sensor for detecting valuable documents and method for keeping a sensor window of the sensor clean
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United States of America Patent
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Apr 16, 2013
Grant Date -
Jul 28, 2011
app pub date -
Aug 8, 2008
filing date -
Aug 10, 2007
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Abstract
In a method for keeping clean a sensor window of an optical sensor for detecting value documents and/or at least one property of value documents which is disposed with at least one portion in a beam path of the sensor, a gas film attached to a surface of the portion is generated on the portion of the sensor window from gas moving relative to the portion.
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