Method and apparatus for reading two-dimensional bar code symbols with an elongated laser line
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United States of America Patent
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Apr 15, 1997
Issued Date -
N/A
app pub date -
Jun 30, 1994
filing date -
Sep 25, 1992
priority date (Note) -
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Abstract
A plurality of the areas of different light reflectivity of a bar code symbol, or the like, are simultaneously illuminated, using, e.g., a beam of laser light that has an elongated cross-section. The laser light beam is swept over the symbol in a direction transverse to the elongated dimension of the illuminated region so that a two-dimensional area of the symbol is illuminated over time, until the symbol is read. The light that reflects from the illuminated region of the symbol is imaged on a linear sensor array, which is then scanned or read out to produce signals representative of spatial intensity variations of the imaged light along a linear path in the field of view.
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