Registers – Coded record sensors – Particular sensor structure
Patent
1978-04-24
1980-01-22
Kilgore, Robert M.
Registers
Coded record sensors
Particular sensor structure
360113, 360124, G06K 708, G11B 512, G11B 520
Patent
active
041846311
ABSTRACT:
There is provided a reader for reading information magnetically coded on a carrier. The reader includes a magnetizing device for magnetizing the information precoded on the carrier and a transducer for detecting the magnetized information as the carrier is translated successively past the magnetizer and transducer. The magnetizer includes at least one magnetic layer having a succession of adjoining zones, the length of alternate zones being much greater than the length of the other zones and the magnetic induction in the zones being of opposite sense. The transducer includes at least one magneto-resistive detecting member and a magneto-resistive compensating member which are of anisotropic magnetic material. The members are disposed to develop across the compensating member a voltage in response to the interference magnetic field which is equal to that developed across the detecting member due to that field. However, the compensating element is positioned so as to be outside of the magnetic leakage field of the coded information. The leakage field of the magnetizing device is utilized to polarize the magnetic-resistive members by causing their axes of easy magnetization to rotate through an angle .theta. between 0.degree. and 90.degree. and preferably 45.degree..
REFERENCES:
patent: 3509535 (1970-04-01), Berube
patent: 3796859 (1974-03-01), Thompson
patent: 3848217 (1974-11-01), Lazzari
patent: 3945038 (1976-03-01), Lazzari
patent: 3959824 (1976-05-01), Ohi
patent: 3969769 (1976-07-01), Gorter
patent: 4008493 (1977-02-01), Pizzuto
patent: 4038596 (1977-07-01), Lee
patent: 4040113 (1977-08-01), Gorter
patent: 4072994 (1978-02-01), Takashima
patent: 4087789 (1978-05-01), Beery
Hagopian, "Magneto-Resistive Type Hand-Scanning Magnetic Transducer", IBM ch. Disc. Bull., vol. 14, No. 8, pp. 2488-2489, Jan. 1972.
Bate, McGuire & Shelledy, "Magneto-Resistive Read Heads", IBM Tech. Discl. Bull., vol. 17, No. 4, pp. 967-968, Sep. 1974.
Compagnie Internationale pour l'Informatique Cii-Honeywell Bull
Kilgore Robert M.
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