Registers – Coded record sensors – Particular sensor structure
Patent
1979-05-03
1981-01-20
Cook, Daryl W.
Registers
Coded record sensors
Particular sensor structure
360113, 365158, G06K 708, H04N 533, G11C 1100
Patent
active
042464749
ABSTRACT:
A method and apparatus for reading data defined by a plurality of magnetic elements which emit respective predetermined external magnetic fields consists in subjecting an anisotropic magnetoresistive device carrying a substantially constant electrical current to the effect of the external magnetic fields, polarizing in said magnetoresistive device by a magnetic polarizing field in such a way that the direction of magnetization and the axis of easy magnetization of the magnetoresistive material of the said device form a given angle between them, defining the maximum desired value of the said external magnetic fields to which the said magnetoresistive device will be subjected, and making the value of the said angle correspond substantially to the modulus of the sum of the said maximum desired value of external magnetic field and the magnitude of the demagnetizing magnetic field which is set up by the said magnetoresistive medium in response to the said external magnetic field having the said maximum desired value.
REFERENCES:
patent: 3848217 (1974-11-01), Lazzari
patent: 4079360 (1978-03-01), Ookubo et al.
Compagnie Internationale pour l'Informatique
Cook Daryl W.
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