Optical adjustment of working range and beam spot size in electro-optical readers
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United States of America Patent
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Sep 4, 2007
Grant Date -
Sep 15, 2005
app pub date -
May 19, 2004
filing date -
Mar 11, 2004
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Abstract
Working range and laser beam cross-section are adjusted in an electro-optical reader for reading indicia by applying control voltages to a pair of variable lenses to change the shape of a liquid therein. An aperture stop maintains a constant beam cross-section as an input to one of the lenses.
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