Dynamic magnetic information storage or retrieval – Head
Patent
1974-12-27
1976-02-03
Eddleman, Alfred H.
Dynamic magnetic information storage or retrieval
Head
360123, 340174TF, 340174SR, G11B 512, B11C 1114, G11C 1900
Patent
active
039368831
ABSTRACT:
Magnetic bubbles are employed to write and read digitized signals of audio, video and digital data in a magnetic medium, while circumventing the problems associated with high linear tape speed or rotary head motion. Writing is accomplished via the interaction of the bubble stray field within the write head and the magnetic medium, wherein the bubble is expanded to a select geometry within the head to provide a correspondingly higher stray field at the medium surface as required for writing therein. The bubble size prior to expanding does not generate sufficient stray field to write on the medium. Reading is accomplished via the interaction of the stray field from the magnetic history in the medium and the magnetic bubbles in the read head, utilizing an intermediate overlay pattern of high permeability material such as permalloy. In reading, the stray fields from the medium alter the positions of the bubbles in the read head, whereupon the detection of the displaced bubbles provides readout of the medium history. In both the writing and reading processes, the interaction between the medium and the bubble heads is limited to specific areas whereby adjacent bubbles in the head material neither interact with, nor are influenced by, the magnetic medium until the selected conditions are realized.
REFERENCES:
patent: 3540021 (1970-11-01), Bobeck et al.
patent: 3609720 (1971-09-01), Strauss
patent: 3689901 (1972-09-01), Bobeck
patent: 3716781 (1973-02-01), Almasi et al.
patent: 3792451 (1974-02-01), Almasi et al.
patent: 3793639 (1974-02-01), Enz et al.
patent: 3842407 (1974-10-01), Argyle et al.
Ampex Corporation
Eddleman Alfred H.
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