Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1992-02-27
1993-05-11
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Magnetometers
29595, 29608, 148101, 324174, 32420721, 335302, G01R 3306, G01R 300, H01F 106, G01P 3488
Patent
active
052104931
ABSTRACT:
A semiconductor magnetoresistive sensor and a method for its assembly is specifically provided. The preferred assembly method of this invention is compatible with automated semiconductor chip placement and packaging technology, so as to alleviate the previous requirement that the semiconductor sensing element be separately packaged. The sensor leads are substantially embedded within a powdered metal permanent magnet body. An exposed terminal end of each lead is available for electrical and adhesive contact to a subsequently attached magnetoresistive semiconductor sensing element, using conventional semiconductor placement and packaging techniques. The powdered metal magnetic body is preferably formed by utilizing powder metal compaction techniques, wherein the powder metal is compacted around the interior electrical leads. The teachings of this invention may also be employed to form a variety of electrical sensors and devices, wherein the leads are substantially embedded within a metal core so as to produce a solid assembly. The embedded leads may have a variety of shapes, such as straight or coiled, may range in number from one to a plurality, and may have a variety of physical properties, such as magnetic or non-magnetic, depending on the desired application.
REFERENCES:
patent: 3408573 (1968-10-01), Wullkopf et al.
patent: 4926122 (1990-05-01), Schroeder et al.
patent: 4926154 (1990-05-01), Heremans et al.
patent: 4939456 (1990-07-01), Morelli et al.
patent: 4978938 (1990-12-01), Partin et al.
Lequesne Bruno P. B.
Leung Chi H.
Schroeder Thaddeus
Ward Robert W.
General Motors Corporation
Strecker Gerard R.
Wallace Robert J.
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