Method and apparatus for reading both of standard and fluorescent bar codes
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United States of America Patent
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-
Dec 28, 1999
Grant Date -
N/A
app pub date -
Oct 31, 1997
filing date -
Oct 31, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A bar code label scanning system comprises a light source for producing a light beam at a first wavelength which is swept across a bar code. Light from the bar code is passed through a filter for attenuating light scattered from said bar code to approximately a level of light emitted from a fluorescent ink, having an excitation wavelength equal to said first wavelength, in response to irradiation by said light beam. The filtered light is received and a signal representative of the amplitude of the filtered light is generated. The signal is decoded to provide a bit string encoded in said bar code.
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- Non-US Classification not provided for expired patents
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