Magnetic detection system for use in currency processing and method and apparatus for using the same
First Claim
1. A magnetic detection system for authenticating a document, the magnetic detection system comprising:
- a first magnetic scanhead being adapted to create a first magnetic field for saturating the magnetization of an area on each of the bills;
a second magnetic scanhead including an electromagnet, the electromagnet being capable of creating a second magnetic field of adjustable intensity, the second magnetic field being of opposite polarity from the first magnetic field;
wherein the intensity of the second magnetic field is adjusted by changing the amount of current supplied to the electromagnet, wherein the amount of current supplied to the electromagnet is based upon a characteristic of the document to be authenticated.
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Abstract
A magnetic detection system for authenticating a document includes a first magnetic scanhead adapted to create a first magnetic field for saturating the magnetization of an area on each of the bills. The magnetic detection system further includes a second magnetic scanhead with an electromagnet. The electromagnet is capable of creating a second magnetic field of adjustable intensity. The second magnetic field is the opposite polarity of the first magnetic field. The intensity of the second magnetic field is adjusted by changing the amount of current supplied to the electromagnet. The amount of current supplied to the electromagnet is based upon a characteristic of the document to be authenticated.
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Citations
28 Claims
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1. A magnetic detection system for authenticating a document, the magnetic detection system comprising:
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a first magnetic scanhead being adapted to create a first magnetic field for saturating the magnetization of an area on each of the bills;
a second magnetic scanhead including an electromagnet, the electromagnet being capable of creating a second magnetic field of adjustable intensity, the second magnetic field being of opposite polarity from the first magnetic field;
wherein the intensity of the second magnetic field is adjusted by changing the amount of current supplied to the electromagnet, wherein the amount of current supplied to the electromagnet is based upon a characteristic of the document to be authenticated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A magnetic scanhead for sensing a flux measurement of a document being transported past the scanhead, comprising:
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a first pole piece perpendicular to the transport direction;
a second pole piece perpendicular to the transport direction and parallel to the first pole piece;
a middle section located between the first pole piece and the second pole piece;
a coil having a conductive core and an insulating material, the coil being twisted around at least a portion of the first pole piece, the coil having a plurality of ends;
at least one power supply wherein the plurality of ends of the coil are electrically connected to the power supply, the power supply being adapted to supply an adjustable and reversible D.C. electric current to the coil;
a sensor between the first pole piece and the second pole piece, the sensor being adapted to sense the flux measurement of the document being transported. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A currency processing device having an input receptacle adapted to receive a stack of bills to be processed and a transport mechanism adapted to transport bills, one at a time, from the input receptacle along a transport path to at least one output receptacle, the device comprising:
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a denominating sensor disposed along the transport path adapted to obtain denominating characteristic information from each of the bills;
a memory adapted to store master denominating characteristic information and master authentication information;
a first magnetic scanhead disposed along the transport path downstream from the denominating sensor, the first magnetic scanhead being adapted to create a first magnetic field for saturating the magnetization of an area on each of the bills;
a second magnetic scanhead disposed along the transport path downstream from the first magnetic scanhead, the second magnetic scanhead being adapted to create a second magnetic field of variable intensity, the second magnetic field being of opposite polarity from the first magnetic field; and
a processor being adapted to receive the denominating characteristic information from the denominating sensor, the controller being adapted to determine the denomination of each of the bills when the obtained denominating characteristic information favorably compares to the stored master denominating characteristic information, the controller being adapted to adjust the second magnetic field intensity based on the determined denomination of each of the bills. - View Dependent Claims (18, 19, 20, 21, 22)
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23. A method for determining the authenticity of currency bills with a currency processing device, the currency processing device adapted to determine the denomination of each of the currency bills, the method comprising:
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transporting each of the currency bills past a first magnetic scanhead and a second magnetic scanhead located downstream from the first magnetic scanhead, the first magnetic scanhead including a first sensor, and the second magnetic scanhead including a second sensor;
creating a first magnetic field for saturating the magnetization of an area on each of the bills;
measuring with the first sensor the magnetic flux of the area on each of the bills in response to the first magnetic field;
adjusting the intensity of the second magnetic field based on the denomination of each of the currency bills, the second magnetic field being of opposite polarity from the first magnetic field;
measuring with the second sensor the magnetic flux of the area on each of the bills in response to the second magnetic field; and
determining a flux ratio of the first magnetic flux measurement to the second magnetic flux measurement. - View Dependent Claims (24, 25, 26, 27, 28)
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Specification