Static information storage and retrieval – Systems using particular element – Cells of diverse coercivity
Patent
1984-11-02
1987-01-06
Tupper, Robert S.
Static information storage and retrieval
Systems using particular element
Cells of diverse coercivity
360 55, 360122, 360123, 360125, G11C 1100, G11B 502
Patent
active
046352279
ABSTRACT:
The reading head comprises a core, which carries an electric detector winding and which may be E-shaped for reading two rows of Wiegand wires or U-shaped for reading one row of Wiegand wires. Two platelike permanent magnets are spaced from the outer legs of the core. One pole face of each permanent magnet is covered by a low-reluctance element, which terminates close to the core in a top plan view on the reading surface. The core and the magnets include such an oblique angle that in the reading surface of the reading head each low-reluctance element is spaced in the reading direction from the adjacent free leg end of the core. This arrangement ensures that during the reading operation each Wiegand wire will first enter the relatively extensive magnetic field established between those pole faces which are not covered by low-reluctance elements. Thereafter, the Wiegand wire is trigger and then enters the region between the low-reluctance elements and is saturated in that region. That concept permits the design of a reading head which has a short overall length and in which high signal amplitudes are obtained.
REFERENCES:
patent: 2428449 (1947-10-01), Camras
patent: 3700828 (1972-10-01), Zacaroli
patent: 3797031 (1974-03-01), Hashimoto
patent: 3895002 (1975-07-01), Ridgway et al.
patent: 3969771 (1976-07-01), Suzuki et al.
patent: 4593209 (1986-06-01), Sloan
W. D. Kehr and F. B. Shelledy, Making Electromagnetic Shields Including Ferrite, vol. 15, No. 8, Jan. 1973.
L. F. Shew, Increased Density Magnetic Recording, vol. 2, No. 2, Aug. 1959.
Doduco KG Dr. Eugen Durrwachter
Sniezek Andrew L.
Tupper Robert S.
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