Beam shaping for optical scanners
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United States of America Patent
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Apr 21, 1998
Issued Date -
N/A
app pub date -
Jun 30, 1994
filing date -
Sep 28, 1990
priority date (Note) -
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status (Latency Note)
Importance
Abstract
An optical scanner such as a bar code scanner includes a laser diode to create the scanning laser beam. Laser diodes are characteristically astigmatic, and when passed through a rotationally symmetric lens the beam typically forms a waist both in the x (scanning) direction and in the y (perpendicular) direction. The width of the beam envelope in the x direction is adjusted by means of a conventional lens. The width of the beam envelope in the y direction is adjusted by the use of a non-planar mirror, preferably a cylindrical mirror, as the rotating or oscillating element.
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