Badge reader using infrared light
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United States of America Patent
Stats
-
Mar 13, 1984
Grant Date -
N/A
app pub date -
Mar 10, 1982
filing date -
Mar 10, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A badge reader which uses infrared light employs circuitry for determining whether portions of the identification badge are relatively opaque or transparent to infrared radiation upon insertion of the badge into the badge reader. The circuitry includes a source of infrared radiation, such as an infrared emitting diode, a detector of infrared radiation such as a phototransistor, an alignment device for detecting the alignment of the opaque or transparent portions of the badge with the source and detector and for producing an alignment signal. The alignment signal is delivered to an infrared emitting diode driver for driving the diode to produce a pulse of infrared radiation in response to the alignment signal. The detector detects a sufficient amount of infrared radiation only when that portion of the card is relatively transparent, and produces an output in response thereto.
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