Low speed laser scanning apparatus

Apparatus for generating a scanning pattern for the omni-directional reading of bar code indicia. In one embodiment, a rotating mirror assembly is imaged onto itself by a lens and mirror combination which introduces a light displacement of the image resulting in the displacement of the input beam fr...

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Bibliographic Details
Main Author HARDY; JAMES A
Format Patent
LanguageEnglish
Published 22.05.1984
Subjects
CALCULATING
COMPUTING
COUNTING
HANDLING RECORD CARRIERS
PHYSICS
PRESENTATION OF DATA
RECOGNITION OF DATA
RECORD CARRIERS
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Summary:Apparatus for generating a scanning pattern for the omni-directional reading of bar code indicia. In one embodiment, a rotating mirror assembly is imaged onto itself by a lens and mirror combination which introduces a light displacement of the image resulting in the displacement of the input beam from the angle of incidence on the mirror of the input beam. Using an array of such lenses and mirrors, a plurality of spatially displaced light beams of substantially equal power are generated without the use of specialized beam-splitting coatings for use in the generation of a scan pattern. In a second embodiment, the array of mirrors deflects a laser beam two or more times at the same facet of a rotating mirror assembly to increase the angular velocity of the deflected beams, thereby enabling the mirror assembly to be rotated at a lower speed while still maintaining the required angular velocity of the deflected output beam.
Bibliography:Application Number: US19820392448