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Platform positionable in at least three degrees of freedom by interaction with coils

  • US 6,147,421 A
  • Filed: 11/16/1998
  • Issued: 11/14/2000
  • Est. Priority Date: 11/16/1998
  • Status: Expired due to Term
First Claim
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1. A positioning platform comprising:

  • a member having a generally planar surface;

    a plurality of first magnets disposed on said member surface and having a plurality of first magnetic fields generally perpendicular to said member surface, the magnetic field of each magnet being directed in an opposite direction from the magnetic field of an adjacent magnet along at least one direction; and

    a first magnet bearing portion of each of at least one bearing, said first magnet bearing portion being attached to said member and comprising a magnetically permeable material.

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