Electronic card and method for generating a magnetic field from swiping the electronic card through a card reader
First Claim
1. A method for processing data stored in an electronic card, said method comprising:
- accessing a sequence of binary bits, for each data track of at least one data track, from a memory in the electronic card;
determining a time varying electrical current configured to flow in two adjacent wire structures of N wire structures disposed in each data track of the at least one data track to generate a time varying magnetic field that encodes the sequence of binary bits, N being at least 3; and
generating the time varying magnetic field as the card is swiped through a card reader in a minus X direction by driving the time varying electrical current through the two adjacent wire structures, said time varying magnetic field inducing a readback signal in the card reader;
wherein the card comprises a substrate, a processor disposed in the substrate, the at least one data track disposed in the substrate such that each data track is oriented in the X direction, the memory disposed in the substrate, a switch apparatus disposed in the substrate, the N wire structures disposed in each data track, and a power source disposed in the substrate,wherein the power source provides electrical power to the processor, the switch apparatus, and the N wire structures disposed in each data track,wherein said generating the time varying magnetic field comprises said processor operating the switch apparatus with respect to the N wire structures,wherein said operating the switch apparatus comprises electrically coupling the two adjacent wire structures of the N wire structures in each data track to the power source and to electrically decoupling all other wire structures of the N wire structures from the power source, andwherein said electrically coupling the two adjacent wire structures and said electrically decoupling all other wire structures causes the power source to generate a voltage drop that drives the time varying electrical current through each wire structure of the two adjacent wire structures but no electrical current through any other wire structure of the N wire structures, which generates the time varying magnetic field above each wire structure of the two adjacent wire structures but not above any other wire structures of the N wire structures.
1 Assignment
0 Petitions
Accused Products
Abstract
An electronic card and a method for processing data stored in the electronic card. The electronic card includes a memory containing data to be read by a card reader. The electronic card may include a programmable field source containing wire structures geometrically configured and energized in a manner that drives an electric current through only two wire structures at a time for generating a time varying magnetic field that induces a readback signal in the card reader as the electronic card is being swiped through the card reader. An electrical current in at least one wire in the electronic card generates a time varying magnetic field and may include a finite time derivative of electrical current whose magnitude does not exceed a specified maximum time derivative of electrical current corresponding to a peak voltage threshold (Vth) and an overshoot ratio (f) of the card reader.
-
Citations
20 Claims
-
1. A method for processing data stored in an electronic card, said method comprising:
-
accessing a sequence of binary bits, for each data track of at least one data track, from a memory in the electronic card; determining a time varying electrical current configured to flow in two adjacent wire structures of N wire structures disposed in each data track of the at least one data track to generate a time varying magnetic field that encodes the sequence of binary bits, N being at least 3; and generating the time varying magnetic field as the card is swiped through a card reader in a minus X direction by driving the time varying electrical current through the two adjacent wire structures, said time varying magnetic field inducing a readback signal in the card reader; wherein the card comprises a substrate, a processor disposed in the substrate, the at least one data track disposed in the substrate such that each data track is oriented in the X direction, the memory disposed in the substrate, a switch apparatus disposed in the substrate, the N wire structures disposed in each data track, and a power source disposed in the substrate, wherein the power source provides electrical power to the processor, the switch apparatus, and the N wire structures disposed in each data track, wherein said generating the time varying magnetic field comprises said processor operating the switch apparatus with respect to the N wire structures, wherein said operating the switch apparatus comprises electrically coupling the two adjacent wire structures of the N wire structures in each data track to the power source and to electrically decoupling all other wire structures of the N wire structures from the power source, and wherein said electrically coupling the two adjacent wire structures and said electrically decoupling all other wire structures causes the power source to generate a voltage drop that drives the time varying electrical current through each wire structure of the two adjacent wire structures but no electrical current through any other wire structure of the N wire structures, which generates the time varying magnetic field above each wire structure of the two adjacent wire structures but not above any other wire structures of the N wire structures. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. An electronic card, comprising:
-
a substrate; at least one data track disposed in the substrate, each data track oriented in a X direction; a processor disposed in the substrate; a sequence of binary bits for each data track stored in a memory within the substrate; a switch apparatus disposed in the substrate; N coils disposed in each data track and stacked in a Z direction normal to the X direction, said N at least 3, successive coils of the N coils overlapping each other in the Z direction and displaced from each other in the X direction such that a minimum and maximum X coordinate for the X direction of successive coils increases; and a power source disposed in the substrate, said power source configured to provide electrical power to the processor, the switch apparatus, and the N coils in each data track, said processor configured generate a time varying magnetic field including being configured to operate the switch apparatus, as the card is being swiped through the card reader in the minus X direction, to electrically couple two adjacent coils of the N coils in each data track to the power source and to electrically decouple all other coils of the N coils from the power source, which causes the power source to generate a voltage drop that drives about a same electrical current through each coil of the two adjacent coils but no electrical current through any other coil of the N coils to generate the time varying magnetic field above the two adjacent coils but not above any other coil of the N coils, and wherein the time varying magnetic field for each data track is configured to encode the sequence of binary bits for each data track and to induce a readback signal in the card reader. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
-
-
19. A method for processing data stored in an electronic card, said method comprising:
-
accessing a sequence of binary bits, for each data track of at least one data track, from a memory of the electronic card; determining a time varying electrical current configured to flow in at least one wire disposed in each data track of the at least one data track to generate a time varying magnetic field that encodes the sequence of binary bits; and generating the time varying magnetic field as the card is swiped through a card reader in a minus X direction, said time varying magnetic field inducing a readback signal in the card reader; wherein the card comprises a substrate, a processor disposed in the substrate, the at least one data track disposed in the substrate such that each data track is oriented in a X direction, the memory disposed in the substrate, the at least one wire disposed in the substrate, and a power source disposed in the substrate, wherein the power source provides electrical power to the processor and the at least one wire, wherein said generating the time varying magnetic field comprises generating a voltage drop that drives the time varying electrical current through the at least one wire to generate the time varying magnetic field, and wherein said generating the time varying magnetic field comprises generating a finite time derivative of electrical current in the at least one wire at times when no finite time derivative of electrical current is logically required for generating the time varying magnetic field, and wherein a magnitude of the finite time derivative of electrical current does not exceed a specified maximum time derivative of electrical current corresponding to a peak voltage threshold (Vth) and an overshoot ratio (f) of the card reader. - View Dependent Claims (20)
-
Specification