Dynamic magnetic information storage or retrieval – Head – Flux scanning
Patent
1978-01-12
1979-04-24
Wolff, John H.
Dynamic magnetic information storage or retrieval
Head
Flux scanning
360125, G11B 512
Patent
active
041515919
ABSTRACT:
Magnetic transducing heads are disclosed which include two stacks of ferromagnetic laminations. Each lamination in one stack is paired with a lamination in the other stack. At their closest point each pair of laminations defines a transducing gap. The stacks are so positioned that the transducing gaps form a linear array. The tops of the two stacks of laminations are so configured as to lie in a common cylindrical surface, the axis of the common cylindrical surface being perpendicular to the rectilinear array of transducing gaps, though not intersecting it. A cylindrical rotor is rotatably mounted so that its surface is very close to the cylindrical top surfaces of the two stacks. Four low reluctance bridging elements are mounted in the rotor and at or near its cylindrical surface. An exciting winding surrounds one stack of laminations. The method of the invention is carried out by rotating the rotor in synchronism with the movement of magnetic recording tape past the linear array of transducing gaps while passing recording current through the exciting winding, thus repeatedly positioning low reluctance bridging members across successive ones of the gaps between the tops of pairs of laminations in the same order, thereby repeatedly "switching on" the recording flux in successive ones of the transducing gaps in the same order.
REFERENCES:
patent: 3012233 (1961-12-01), Greanias et al.
patent: 3218398 (1965-11-01), Wiley
patent: 3369083 (1968-02-01), Clapper et al.
patent: 3419688 (1968-12-01), Hollingsworth
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