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POSITION-IDENTIFYING DEVICE

  • US 3,598,903 A
  • Filed: 06/06/1968
  • Issued: 08/10/1971
  • Est. Priority Date: 06/06/1968
  • Status: Expired due to Term
First Claim
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1. A device for providing positional information relative to an electromagnetic radiating probe when positioned in close proximity to selected locations on a surface comprising:

  • a first group of spaced electrically independent conductive loops located in a single layer in close proximity to said surface, a second group of spaced eleCtrically independent conductive loops located in a single layer in close proximity to said surface and arranged to intersect the first group of loops, said intersections defining a plurality of unique response areas in the said surface, a first group of sense amplifiers each responsive to one of the loops in the first group of loops for providing an output when the probe is bracketed by the connected loop, and a second group of sense amplifiers each responsive to one of the loops in the second group of loops for providing an output when the probe is bracketed by the connected loop whereby the probe position can be determined by the sense amplifier outputs when it is located within any of the unique response areas defined by the intersecting loops.

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