Patent ID: 8405479

Claim:
A magnet structure comprising: a first layer of magnets comprising a first pole magnet and a plurality of first magnets positioned about the first pole magnet and oriented such that the plurality of first magnets have respective magnetic fields directed inward relative to the first pole magnet; a second layer of magnets comprising a second pole magnet and a plurality of second magnets positioned about the second pole magnet and oriented such that the plurality of second magnets have respective magnetic fields directed outward relative to the second pole magnet; and a planar magnet positioned between the first and second layers of magnets and oriented such that a south pole of the planar magnet is disposed in a facing relationship to a south pole of the first layer of magnets and such that a north pole of the planar magnet is disposed in a facing relationship to a north pole of the second layer of magnets, wherein the planar magnet has a magnetic field that extends in a uniform direction throughout the planar magnet.