Patent ID: 7591427
Filing Date: 2009-09-22
Classification: G06K

Abstract:
1. A method of statically writing data on a magnetic stripe of a magnetic stripe card that requires no card internal circuitry by externally imposing magnetic field of a given polarity on each selected segment of the magnetic stripe and of reading data by sensing the remanent field of each segment of the magnetic stripe by multiple fluxgate that are sharing a sense coil method that is external to the card such that data on the magnetic stripe can also be read by a swipe magnetic card reader and interpreted as digital bits, comprising: (i) providing a multi-dimensional conductor array placed proximate to the magnetic stripe where each magnetic stripe segment is associated with at least one conductor; (ii) providing current drivers for sending currents in controlled directions through the conductor array; (iii) sending said currents, using said current drivers, through conductors of the array, such that during writing, the composite current in a conductor overcomes the coercivity of a given segment of the magnetic stripe; (iv) a sense coil wrapped around a ferromagnetic core and shared with the conductor array is used as part of multiple fluxgates that during reading senses at least the polarity of each segment using a fluxgate method while the conductor arrays of each segment, independently, induce flux into the core using current that does not overcome the coercivity of the magnetic stripe; (v) a magnetic domain matrix addressing method for both reading from and writing onto the magnetic stripe.