Optical reader having illumination assembly including improved aiming pattern generator
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United States of America Patent
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May 9, 2000
Issued Date -
N/A
app pub date -
Sep 24, 1997
filing date -
May 15, 1995
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Abstract
An optical assembly for use with optoelectronic readers. An imaging optical assembly having an imaging optical axis forms an image of a two-dimensional region on an optoelectronic imaging device. An aiming pattern generator including at least a point-like aiming light source and an interferometric pattern generating optical element project onto the two-dimensional region a luminous aiming pattern that approximately coincides with the field of view of the imaging device. The aiming optical axis of the aiming pattern remains approximately coincident with the field of view of the imaging device over the range of reader-to-target distances over which the reader is used.
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