Magneto resistive bubble detection device

Details Magneto resistive bubble detection device Magneto resistive bubble detection device

1974-05-13

1976-04-27

Urynowicz, Jr., Stanley M.

Communications: electrical

Digital comparator systems

340174TF, 340174DA, G11C 1114

Patent

active

039538400

ABSTRACT:
A differential detection device is provided for detecting the presence of magnetic bubbles in a data stream circulating on a magnetic wafer. The device utilizes an array of columns of permalloy elements to enlarge the magnetic bubbles being detected. A change in resistance of each of a pair of adjacent permalloy columns as a bubble traverses the detector is sensed and differentially detected to signify the presence of the bubble. In one embodiment of the invention, a second detector is used in conjunction with the first detector to provide operation in a mode in which bubbles in alternate positions in the data stream are directed into alternate channels including the first and second detectors respectively. After detection, the bubbles are redirected into a single data stream, while the output signals from the two detectors are merged to produce a data output signal reproducing the original data stream.

REFERENCES:
patent: 3702995 (1972-11-01), Bobeck et al.
patent: 3713120 (1973-01-01), Bobeck et al.
patent: 3813660 (1974-05-01), Buhrer
patent: 3820089 (1974-06-01), Lama

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