Housing structure and magnetic biasing for bubble memories

Details Housing structure and magnetic biasing for bubble memories Housing structure and magnetic biasing for bubble memories

1973-11-14

1976-01-06

Urynowicz, Jr., Stanley M.

Communications: electrical

Digital comparator systems

340174TF, 340174PM, 340174MA, G11C 1114, G11C 504

Patent

active

039316181

ABSTRACT:
A completely enclosed housing of a magnetically permeable material contains a pair of magnetic discs. A magnetic bubble chip mounted in a gap between the magnetic discs is thereby subjected to a d.c. magnetic bias field provided by the discs but is also shielded from the effects of external magnetic fields. The device may be precisely magnetized by applying in succession two external magnetic fields of suitable magnitude, in opposite directions.

REFERENCES:
patent: 3087131 (1963-04-01), Babcock et al.
patent: 3241126 (1966-03-01), Snyder
patent: 3609611 (1971-09-01), Parnell
patent: 3702991 (1972-11-01), Bate et al.
patent: 3711841 (1973-01-01), Geusic et al.
patent: 3742471 (1973-06-01), Mikami
patent: 3806903 (1974-04-01), Myer
patent: 3836896 (1974-09-01), Rifkin
patent: 3864671 (1975-02-01), Myer
IBM Technical Report "Permanent Magnet Bias Schemes for Bubble Memory Applications," by Lyons (TR22.1633), pp. 1-12, 5/8/73.

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