OPTICAL READING DEVICE, OPTICAL READING METHOD, AND PROGRAM
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United States of America Patent
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Issued Date -
Mar 12, 2015
app pub date -
Mar 11, 2013
filing date -
Apr 18, 2012
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Abandoned
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Abstract
An optical reading device authenticates an identification medium with cholesteric liquid crystal layer, having a structure in which no movable parts are necessary for switching circular circularly polarized light filter. The optical reading device reads an image from an identification medium having a cholesteric liquid crystal layer having a hologram processed, and an ink printed pattern layer in this order, and the device includes a light emitting part in which a right circularly polarized light filter is arranged in front of an LED, a light emitting part in which a right circularly polarized light filter is arranged in front of an LED, and a controlling part which switches light emission between the light emitting parts.
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