Static information storage and retrieval – Magnetic bubbles – Guide structure
Patent
1987-02-02
1989-03-07
Moffitt, James W.
Static information storage and retrieval
Magnetic bubbles
Guide structure
365 8, 365 36, G11C 1908
Patent
active
048112860
ABSTRACT:
A magnetic bubble memory has a reading zone with thin detection elements, coated with an insulating layer which carries thick bubble propagation patterns of high magnetic permeability material, and a bubble stretching zone also including thick propagation patterns of shapes such that the rotating field of the device causes the bubbles to progress along the patterns. The device further includes, out of the detection zone, additional thin localized elements of high magnetic permeability material having a thickness much lower than that of the patterns, obtainable by photolithography and located at the same level as the thin detection elements. When located in the stretching zone, the thin patterns are arranged to cooperate with thick patterns so that the voltage well generated by the rotating field of the device has a substantially constant value while moving along the thick patterns.
REFERENCES:
patent: 4471467 (1984-09-01), de Jonge et al.
IBM Technical Disclosure Bulletin-vol. 16, No. 10, Mar. 1974, p. 3395.
IBM Technical Disclosure Bulletin-vol. 19, No. 7, Dec. 1976, pp. 2802-2803.
Patent Abstracts of Japan, Japanese 58/177586-Hitachi.
Patent Abstracts of Japan, Japanese 56/25282-Oki Denki Kogyo.
Patent Abstracts of Japan, Japanese 56/58187-Fujitsu.
Moffitt James W.
Societe d'Applications Generales
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