Electricity: measuring and testing – Magnetic – Displacement
Patent
1987-11-04
1989-08-01
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Magnetic
Displacement
324252, 307309, 338 32R, G01B 714, H03K 1790, H03K 1918, H01L 4306
Patent
active
048536318
ABSTRACT:
A magnetoresistive sensor includes groups of MR elements arranged on a non-magnetic substrate for selective connection to detect and sense magnetic information recorded on a number of different diameter encoder wheels of which each diameter wheel may have a different number of pieces of magnetic information recorded at corresponding different wavelenths (.lambda.) on a circumferentially running track located on the circumferential face of the wheel. The MR sensor includes an additional MR element arrangement for detecting and sensing index magnetic information recorded on an additional circumferentially running track located on the circumferential face of the wheel. The connection arrangement of the MR elements is such to form external power supply connection terminals which have a width substantially larger than the width of the MR elements and surround the MR elements covering a substantial portion of the substrate surface to form a heat sink to eliminate thermal gradients from developing across the substrate thereby providing thermal stability.
REFERENCES:
patent: 4418372 (1983-11-01), Hayashida et al.
patent: 4639807 (1987-01-01), Sekizawa et al.
Eisenzopf Reinhard J.
Snow Walter E.
The Superior Electric Company
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