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US 4,731,751 AGranted
Magnetic bubble memory device
AssigneeFujitsu Limited
InventorSeiichi Iwasa
Life of this patent
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Abstract
A magnetic bubble memory device comprises a magnetic bubble memory chip, a unit for generating a bias field, a magnetic shield, and a unit for compensating the bias field, wherein the thermodependency of the bias field is compensated to approximate that of the operation characteristics of the memory chip over a wide temperature range, thereby providing a wide region in which operation is ensured.
Claims20
A magnetic bubble memory device, comprising;
- a magnetic bubble memory chip;
- means for generating a bias field for maintenance of magnetic bubbles in said memory chip;
- a magnetic shield disposed externally of said bias field-generating means for isolating an external magnetic field;
- and
- mean, disposed externally of said magnetic shield, for compensating said bias field in accordance with the temperature, and for generating a compensation field opposite in direction to said bias field.
2 more elements
Dependencies are inferred from the claim text.