Optical card-key data connector
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United States of America Patent
Stats
-
Aug 23, 1988
Grant Date -
N/A
app pub date -
Jul 6, 1984
filing date -
Jul 6, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A card-key device with an embedded microprocessor is able to communicate with a computer-based security system via an optical connection. The optical connection is made by linking a light-emitting diode with a phototransistor through a 'light tunnel' created by a mechanical connection. Electromagnetic sensors and grippers are used to assure each side of the connection that a valid connection has been made, as well as to supply power to the card-key on-board microprocessor. The card-key's on-board microprocessor can be used to retrieve an identifying number, to store data for the security system, or to perform other data transformation functions for the security system.
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