Forgery proof optoelectric code card reader
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United States of America Patent
Stats
-
Aug 1, 1989
Grant Date -
N/A
app pub date -
Oct 28, 1987
filing date -
Oct 30, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A forgery-proof optoelectric card system is disclosed which includes a reader and code card comprising invisible light and dark codings forming at least one reading track. At least one reading head is provided which may comprise a photodiode as a ligh source and a phototransistor as a light receiver. The light codings having a first pass band to infrared light. Superimposed over selected ones of said light codings are filters having an attenuation band that is narrower than and lies within the pass band of the light codings. Additionally, a secondary light receiver responsive only to light lying within the attenuation band of the filter is provided.
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