Aiming beam system for optical data reading device
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United States of America Patent
Stats
-
Mar 22, 1994
Grant Date -
N/A
app pub date -
Feb 28, 1992
filing date -
Feb 28, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical scanning system including an aiming system which is particularly suitable for handheld scanners where the outgoing light is scanned over a desired angle in a scan plane. The aiming system includes a light source generating an optical beam along an outgoing optical path toward an object to be scanned; a detector for detecting light reflected off the object; an oscillating scan mirror in the outgoing optical path directing light toward the object along a scan plane; and a diffractive optical module positioned in the outgoing optical path adjacent the scan mirror, the diffractive optical module having a pair of diffractive optical elements separated by an aperture, the diffractive optical elements positioned on either side of an aperture along the scan plane, each diffractive optical element de-scanning the portion of the optical beam passing therethrough to form an aiming light beam.
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