Badge reader using infrared light

Details Badge reader using infrared light Badge reader using infrared light

G - Physics

06

K

354/56

G06K 19/06 (2006.01) G06K 7/12 (2006.01)

Patent

CA 1172764

ABSTRACT OF THE DISCLOSURE The present invention relates to an apparatus for determining whether portions of an identification badge are relatively opaque or transparent to infrared radiation upon movement of the badge relative to the apparatus. The apparatus comprises a source of infrared radiation; a detector of infrared radiation; alignment means for detecting the alignment of the relatively opaque or transparent portions of the badge with the source and detector and for producing an alignment signal upon alignment; and activating means for activating the source to produce a pulse of infrared radiation in response to a signal related to the alignment signal, whereby the detector provides an output in response to the pulse only when the portion is relatively transparent.

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