Method of making a weak-field magnetic field sensor having etched circuit coils
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United States of America Patent
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Aug 7, 2001
Grant Date -
N/A
app pub date -
Apr 9, 1999
filing date -
Dec 27, 1995
priority date (Note) -
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Abstract
The subject of the invention is a weak-field magnetic sensor with the following features: etched circuit coils are substituted for conventional coil technology. The sensor includes an amorphous core having epoxy bases stacked relative to one another on the top and bottom surfaces thereof. One epoxy base has a coil Y etched thereon. A second epoxy base has a coil X etched thereon. The remaining epoxy base has circular patterns etched thereon. The amorphous core is formed from at least two amorphous thin boards stacked on opposite sides of an epoxy base thin board. The epoxy base thin board has a particular pattern etched thereon and the capacity for vertical conductivity. The coil conductor size and position accuracy is controlled in increments of microns by the etching process. The range of detection errors and the level of reception has no non-uniformities. A thin and small sensor in terms of the structure is therefore enabled. Moreover, the sensor is not easily affected by outside factors such as broken wires. It is also capable of being mass produced.
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