Detecting luminescent security features
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Mar 17, 1987
Grant Date -
N/A
app pub date -
Apr 27, 1984
filing date -
Apr 29, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Luminescent security features in or on documents are detected using a detector comprising a fibre optic light guide arranged to transmit an interrogation beam originating from a source onto a document to be tested; and a housing in which a photo-diode array is mounted to receive luminescence emitted from the document. The photo-diode array is connected to electronic circuitry for discriminating between luminescence due to a security feature and other luminescence emitted by the document and for determining that a security feature has been detected.
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