Method and apparatus for the contact-free identification of articles having a protective enclosure, wherein the articles are identified using multiple electromagnetic wave transmission/reception devices
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United States of America Patent
Stats
-
Dec 10, 1996
Grant Date -
N/A
app pub date -
Jan 11, 1995
filing date -
Jan 11, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The system has a reader of electronic labels comprising several devices for the transmission/reception of electromagnetic waves, offset angularly about a median axis so that, when the reader is placed in the vicinity of a label and irrespectively of their relative orientation, at least a part of the lines of the magnetic field generated by at least one of said transmission/reception devices can get looped by passing into the coil of the label in the direction of its axis. The label has a foil made of amagnetic and conductive material placed against the antenna and parallel to it to form a reflective screen for the electromagnetic waves. Application to the contact-free identification of objects, notably metal objects, such as gas cylinders.
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Patent Citation Ranking
- 13 Citation Count
- G06K Class
- 30.34 % this patent is cited more than
- 29 Age