Apparatus for sensing magnetic fields from a wide range of magne

Details Apparatus for sensing magnetic fields from a wide range of magne Apparatus for sensing magnetic fields from a wide range of magne

1995-05-19

1997-05-27

Shepperd, John

Registers

Coded record sensors

Particular sensor structure

G06K 708

Patent

active

056334869

ABSTRACT:
Apparatus for reading magnetically stored data from a wide range of magnetic media. The apparatus includes a magnetoresistive MR head for producing a signal representative of stored magnetic data and a hysteresis comparator circuit for processing the signal from high concentration media. The MR head is preferably a paired MR head having a preamplifier circuit which provides the bias current for the PMR head, amplifies the signal produced by the PMR head, and provides rejection of common mode signals.

REFERENCES:
patent: 3860965 (1975-01-01), Voegeli
patent: 4246473 (1981-01-01), Maussion
patent: 4447781 (1984-05-01), vanDyke
patent: 4524401 (1985-06-01), Uchida et al.

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