Method and apparatus for reducing specular reflection from a scannable surface
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United States of America Patent
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N/A
Issued Date -
Sep 12, 2002
app pub date -
Mar 7, 2002
filing date -
Mar 8, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
We have discovered that it is possible to create a beam of light that is polarized in a linear fashion from the illuminator. This beam is directed to the bar coded labels (should not be limited to these only) at a relatively low angle of incidence. The beam is reflected toward the sensor (camera) optics. Before reaching the sensor, it passes through a second polarizing filter which blocks the transmission of the direct specular reflection from the label. The sensor only receives the information from the substrate by the diffuse reflection. The concept was developed specifically with the linerless label stock in mind. However, the present invention can be applied to linerless label sales to UPS and possibly other freight carriers, and/or to other types of labels and surfaces for optical scanning.
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