Polarizer based detector
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United States of America Patent
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Nov 18, 2003
Grant Date -
Jul 4, 2002
app pub date -
Nov 30, 2001
filing date -
Dec 1, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Apparatus and method for detecting strings attached to bills or other forms of payment in a currency validator. In one implementation a string fraud detector uses polarized light to detect a string. In another implementation, polarized light and light in a different range of wavelengths are used to detect a string.
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