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Position and orientation measuring system having anti-distortion source configuration

  • US 5,640,170 A
  • Filed: 06/05/1995
  • Issued: 06/17/1997
  • Est. Priority Date: 06/05/1995
  • Status: Expired due to Term
First Claim
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1. A source for a position and orientation measuring system having a driver which applies signals to said source to generate a plurality of electromagnetic fields which are distinguishable from one another, a remote sensor which senses the generated electromagnetic fields and a processor which processes an output of said sensor into remote object position and orientation relative to a reference coordinate frame of said source, comprising:

  • an electrically conducting sheet; and

    a planar coil including a plurality of substantially coplanar concentric rings above said sheet, said planar coil being adapted for coupling to the driver for receiving signals from the driver to generate a low-distortion electromagnetic field that may be sensed by said sensor.

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