Registers – Coded record sensors – Particular sensor structure
Patent
1978-05-31
1980-04-15
Cook, Daryl W.
Registers
Coded record sensors
Particular sensor structure
360113, 365157, G06K 708, G11B 512, G11B 530
Patent
active
041979877
ABSTRACT:
Fringing magnetic fields established by magnetic bars having parallel longitudinal axes are read from documents, such as checks, to determine a code on the document. The fringing fields extend in opposite directions to indicate the code. An array of magnetoresistive elements responsive to a DC energizing current is included so that at least one of the elements is provided for each of the fields. An alternating magnetic field of predetermined frequency and phase is coupled to each of the elements by a conductor that is effectively a single turn coil. The alternating magnetic field is superimposed on the fringing field so that the two fields are combined in each element to modulate the DC energizing current. The predetermined phase is compared with the phase of the modulated current to provide an indication of the fringing field direction and of the code. The conductors and elements are mounted in registration on a dielectric substrate, so that each substrate is effectively a plane of a three-dimensional matrix including a multiplicity of substrate planes.
REFERENCES:
patent: 2780774 (1957-02-01), Epstein
patent: 3151316 (1964-09-01), Bobeck
patent: 3526899 (1970-09-01), Speliotis et al.
patent: 3573127 (1971-03-01), Root et al.
patent: 3634657 (1972-01-01), Ballard et al.
Compagnie Internationale pour l'Informatique
Cook Daryl W.
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