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US 4,229,806 AGranted
Consecutive bit bubble memory detector
AssigneeSperry Corporation
InventorRichard M. Josephs
Life of this patent
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Abstract
Consecutive bit bubble memory devices employ a dummy detector element separated from the detector element. This arrangement causes substantial background magnetoresistor noise. The dummy detector of the present invention is located in a novel dummy array which minimizes the magnetoresistor noise, enhances the signal-to-noise ratio and enables the detection of bubble domains without error.
Claims10
A detector for a consecutive bit bubble memory device of the type having a magnetoresistor detector and a dummy magnetoresistor detector comprising:
- an expanding stack having a plurality of columns of propagation elements for receiving and expanding consecutive bit bubble stream,
- a deep stack adjacent said expanding stack having a plurality of columns of propagation elements for receiving and containing said expanded bubble stream,
- a magnetoresistor detector adjacent said deep stack adapted to change resistance as a bubble is propagated there through,
- a shallow stack adjacent said detector having a plurality of columns of propagation element,
- a first guard rail stack adjacent said shallow stack having a plurality of columns of anti-propagation elements for receiving and annihilating said bubble stream,
- a dummy array comprising,
- a leading propagation stack having a plurality of propagation columns, the number of said columns in said leading propagation stack being substantially smaller than the number of propagation columns in said deep stack,
- a dummy magnetoresistor detector adjacent said leading propagation stack,
- a trailing propagation stack adjacent said dummy detector having a plurality of columns of propagation elements, the number of said columns in said trailing propagation stack being substantially equal to the number of columns in said shallow stack, and
- a second guard rail stack adjacent said dummy array adapted to prevent stray bubbles from entering said dummy array.
7 more elements
A detector for a continuous bit bubble memory device comprising:
- a detector array comprising a magnetoresistor detector, a deep stack and a shallow stack,
- a dummy detector array comprising a dummy magnetoresistor detector, a leading stack and a trailing stack positioned adjacent said detector array,
- first and second guard rails embracing said dummy detector array on either side,
- said trailing stack and said shallow stack having a plurality of columns of propagation elements which are substantially equal, and
- indicating means connected to said magnetoresistor detectors for indicating the presence or absence of a bubble being propagated through said magnetoresistor detector.
2 more elements
Dependencies are inferred from the claim text.