Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1994-09-26
1996-10-15
Hofsass, Jeffery A.
Communications: electrical
Condition responsive indicating system
Specific condition
340551, 3408253, 34082534, 177139, 177145, G08G 1314
Patent
active
055658466
ABSTRACT:
A reader for radio frequency identification tags having at least one magnetic field transmitting and receiving coil which is oriented in a given plane and which is responsive to a received magnetic exciter field of a first frequency to produce and radiate an identifying magnetic field comprised of a carrier at a second different frequency modulated by an identifying code. The reader comprises a first circuit for producing a radio frequency signal of the first frequency; a first magnetic field coupling arrangement connected to the output of said first circuit for producing a corresponding exciter field at the first frequency to be magnetically coupled to the receiving coil of the tag, with the first magnetic field coupling arrangement including a solenoidal exciter coil having at least one wound exciter winding and a longitudinal axis disposed substantially perpendicular to the plane of the tag coil; a second magnetic field coupling arrangement for receiving a magnetic field of the second frequency produced by the tag and providing a corresponding electrical signal, with the second magnetic field coupling arrangement including at least one receiver coil disposed adjacent one end of the solenoidal coil; and circuitry connected to the receiver coil for decoding the received electrical signal. Preferably the tag is disposed on the lid of a trash or waste bin with the tag coil being substantially horizontal and the axis of the exciter coil is disposed substantially vertically.
REFERENCES:
patent: 5012236 (1991-04-01), Troyk et al.
patent: 5099226 (1992-04-01), Andrews
patent: 5099227 (1992-03-01), Geiszler et al.
patent: 5221831 (1993-08-01), Geiszler
patent: 5230393 (1993-07-01), Mezey
Eberhardt Noel H.
Geiszler Theodore D.
Radding Herbert P.
Walker Russel E.
Hofsass Jeffery A.
Indala Corporation
Lee Benjamin C.
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