Magnetic reading devices

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 6230972
SERIAL NO

09202631

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A detector for sensing the presence of a magnetic tag having an axis of easy magnetization, which comprises (1) either (i) a magnet or (ii) a pair of magnets arranged in magnetic opposition, the magnet or magnets being disposed so as to define a spatial region through or across which the magnetic tag is, in use, passed, the disposition of the magnet(s) and the resultant magnetic field pattern being such as to cause a change in polarity of the magnetization of the magnetic tag in the course of its passage through a magnetic null within the spatial region; and (2) a receiver coil or coils positioned above and in proximity to one pole of the magnet (where a single magnet is employed), or positioned between the pair of magnets (where two magnets are employed) and arranged to detect magnetic dipole radiation emitted by a magnetic tag as it passes through the magnetic null with the easy axis of magnetization of the tag oriented in the direction of travel. The receiver coils are preferably constructed as an assembly of printed circuit boards whose conductive tracks are interconnected to form a three dimensional coil having windings in the various layers.

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Patent Owner(s)

Patent OwnerAddress
FLYING NULL LIMITEDHARSTON CAMBRIDGE CB2 5NH

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Crossfield, Michael David West Wickham, GB 9 283
Dames, Andrew Nicholas Cambridge, GB 42 1004
McKinnon, Alexander Wilson Grantchester, GB 2 28

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