Apparatus for mutual information transmission in a lock and key system
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United States of America Patent
Stats
-
Jul 22, 1986
Grant Date -
N/A
app pub date -
Jan 28, 1985
filing date -
Jan 27, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus for mutual information transmission between an electronic lock and a key uses antenna coils at both the key and lock. A periodic signal is emitted from the lock and is received by the key upon activation of a key electronics and emission of a coded information signal. This returned signal received from the lock coil is briefly short-circuited or damped at the key side in order to produce a synchronization switch synchronizing the points in time of the signal appearance. Electronic converters are provided which, given the pre-condition that the short-circuit signal extends over a plurality of signal pulses, generate a digital signal corresponding to the short-circuit times.
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