Magnetic bubble device

Static information storage and retrieval – Magnetic bubbles – Disposition of elements

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365 1, 365 28, 324210, G11C 1908

Patent

active

044569742

ABSTRACT:
The specification describes a magnetic bubble device which incorporates a Z coil for providing a test magnetic field in addition to the usually provided bias field. In order to reduce package size the Z coil comprises at least one printed coil 17 formed on a substrate 15. The substrate 15 may be a flexible substrate such as polyimide film which is provided as a flap on a chip connection substrate formed from the same film, the flap folding over to lie parallel with the chip connection substrate.
The invention enables a Z coil to be provided within a package without unduly increasing package height and provides an additional advantage that the substrate which supports the Z coil may be used to protect the magnetic bubble device chip.

REFERENCES:
patent: 4045786 (1977-08-01), Lee et al.
patent: 4158811 (1979-06-01), Li et al.
patent: 4160274 (1979-07-01), Stephenson, Jr. et al.
patent: 4213091 (1980-07-01), Cooper
IEEE Transactions on Magnetics-vol. Mag.-13 No. 5, Sep. 1977, pp. 1370-1372.

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