OPTICAL READER MODULE AND OPTICAL READER
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United States of America Patent
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Issued Date -
Jul 12, 2012
app pub date -
Dec 22, 2011
filing date -
Jan 7, 2011
priority date (Note) -
Abandoned
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Abstract
An optical reader module includes a first illumination light source that emits reproducing illumination light to an image-capture target containing a hologram in which information reproduced in a predetermined angle area when illuminated from a predetermined angle is recorded, thereby reproducing the information recorded in the hologram; an image-capturing device that captures an image of the information reproduced from the hologram; and a first light-projecting unit that projects first-optical-guide-forming light on the image-capture target. A first optical guide projected on the image-capture target takes a predetermined shape when the emission angle of the reproducing illumination light to the hologram is equal to the predetermined angle. An observer of the image-capture target recognizes misalignment between the emission angle of the reproducing illumination light to the hologram and the predetermined angle, based on distortion of the first optical guide projected on the image-capture target from the predetermined shape.
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