Proximity identification system with lateral flux paths
First Claim
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1. A proximity identification system comprising:
- an electronic reader section for reading inductively coupled electromagnetic coded flux signals, the reader section having a reader circuit connected to a reader antenna for supplying power to said reader antenna, said reader antenna including a pair of separate coils located proximate one another along a first coil pair line, said pair of coils both located in a reader plane and oriented with the electromagnetic flux paths being between the coils in a direction parallel to said first coil pair line, said flux paths located above and below said reader plane when said coils are energized by power from said reader circuit, said reader coils are connected to said reader circuit such that, for any time phase, if the current in one of the coils is flowing in a clockwise direction, then the current in the other coil is flowing in a counter clockwise direction; and
an identifier section detached from the reader section and movable relative to the reader section, the identifier section having an identifier circuit for storing and transmitting multiple bits of information, said identifier circuit being connected to an identifier antenna, said identifier antenna being oriented with its axis parallel to, and intersecting said flux from said reader section whereby the identifier section is powered by power radiated by said reader antenna.
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Abstract
An electrical proximity identification system which has lateral flux. The system has a reader section with a reader antenna which is comprised of a pair of coils. The coils are located in the same plane and are oriented such that when they are energized by radio frequency power, the flux lines travel between the coils in a direction parallel to, but above and below, said plane. The system also has an identifier section with an identifier antenna. The identifier antenna is positioned such that its axis is parallel to the plane and in line with the flux lines.
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Citations
28 Claims
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1. A proximity identification system comprising:
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an electronic reader section for reading inductively coupled electromagnetic coded flux signals, the reader section having a reader circuit connected to a reader antenna for supplying power to said reader antenna, said reader antenna including a pair of separate coils located proximate one another along a first coil pair line, said pair of coils both located in a reader plane and oriented with the electromagnetic flux paths being between the coils in a direction parallel to said first coil pair line, said flux paths located above and below said reader plane when said coils are energized by power from said reader circuit, said reader coils are connected to said reader circuit such that, for any time phase, if the current in one of the coils is flowing in a clockwise direction, then the current in the other coil is flowing in a counter clockwise direction; and an identifier section detached from the reader section and movable relative to the reader section, the identifier section having an identifier circuit for storing and transmitting multiple bits of information, said identifier circuit being connected to an identifier antenna, said identifier antenna being oriented with its axis parallel to, and intersecting said flux from said reader section whereby the identifier section is powered by power radiated by said reader antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A proximity identification system comprising:
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an electronic reader section for reading inductively coupled electromagnetic coded flux signals, the reader section having a reader circuit connected to a reader antenna for supplying power to said reader antenna, said reader antenna including a pair of separate coils located along a first coil axis with a space between the coils to allow for passage of an object to be identified, said coils being oriented with the electromagnetic flux travel path being between the coils in a direction parallel to said coil axis when both of said coils are energized by power from said reader circuit, said reader antenna coils are connected to said reader circuit such that the current flows in the same direction in portions of each loop located along lines parallel to said coil axis; and an identifier section detached from the reader section and movable relative to the reader section, the identifier section having an identifier circuit for storing and transmitting multiple bits of information, said identifier circuit being connected to an identifier antenna, said identifier antenna being mounted with an identifier antenna axis parallel to said coil axis whereby the identifier section is powered by power radiated by said reader antenna. - View Dependent Claims (18, 19)
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20. A proximity identification system comprising:
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an electronic reader section for reading inductively coupled electromagnetic coded flux signals, the reader section having a reader circuit connected to a reader antenna for supplying power to said reader antenna, said reader antenna having a first pair of separate coils located in a first plane along a first coil pair line and a second pair of separatecoils located in a second plane along a second coil pair line parallel to said first coil pair line, said second plane being a distance from and parallel to said first plane, a first coil of each coil pair located along a first axis line and a second coil of each coil pair located along a second axis line, said first and second axis lines being perpendicular to said first and second plane, said coils connected to said reader circuit with the electromagnetic flux path between the coil pairs in a direction parallel to said first and second coil pair lines and said flux path is located between said first and second planes, the reader antenna is connected to said reader circuit such that, for any time phase, if the current in a first of said coils is flowing in a clockwise direction, then the current is flowing in a counterclockwise direction in the coils located along the same coil pair line and the same axis line as the first mentioned coil; and an identifier section detached from the reader section and movable relative to the reader section, the identifier section having an identifier circuit for storing and transmitting multiple bits of information, said identifier circuit being connected to an identifier antenna, said identifier antenna being mounted with an axis of the identifier antena parallel to said flux travel path whereby the identifier section is powered by power radiated by said reader antenna. - View Dependent Claims (21)
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22. A proximity identification system comprising:
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an electronic reader section for reading inductively coupled electromagnetic coded flux signals, the reader section having a reader circuit connected to a reader antenna for supplying power to said reader antenna and for detecting a modulated identifier signal, said reader antenna comprised of a magnetic rod located in a reader plane, said magnetic rod wound with turns of wire such that when said reader antenna is energized by application of a voltage at radio frequencies from said reader circuit, the flux paths are in a direction parallel to said magnetic rod, and said flux paths are located on either side of said reader plane; and an identifier section detached from the reader section and movable relative to the reader section, the identifier section having an identifier circuit for storing and transmitting multiple bits of information as said modulated identifier signal, said identifier circuit being connected to an identifier antenna, said identifier antenna being oriented with its axis parallel to and intercepting said flux from said reader section. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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Specification