Article identifying system
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United States of America Patent
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-
Apr 17, 1990
Grant Date -
N/A
app pub date -
Mar 1, 1988
filing date -
Mar 6, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An article identifying system comprises an ID device attached to an article to be identified and a write/read control apparatus to write and read data into and from the ID device. The control apparatus has an oscillator. The ID device has a resonance circuit. Data transmission is performed by the electromagnetic coupling of the oscillator and resonance circuit. The FSK modulation/demodulation are used in this data transmission. Preferably data is encoded by bi-phase code, f/2f code, bipolar code, or dicode code. An electric power can be also supplied from the control apparatus to the ID device by the continuous oscillation of the oscillator.
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