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Shielding techique for digitizers

  • US 4,853,497 A
  • Filed: 06/20/1988
  • Issued: 08/01/1989
  • Est. Priority Date: 06/20/1988
  • Status: Expired due to Fees
First Claim
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1. A shield for use in eliminating edge effects from an electromagnetic digitizer having a rigid rectangular circuit board therein containing an active area of a grid of wires surrounded by a peripheral area of conencting wires containing sensitive interconnecting circuitry comprising:

  • a pan-shaped shield of a non-ferrous metal, said shield being sized and shaped to fit over an underside of the grid of wires and surrounding area of connecting wires, said shield comprising a center section disposed over the active area of the grid wires and spaced from the active area a distance sufficient to provide no interference with the operation thereof and an outer peripheral shielding lip that is disposed in close-spaced, non-contacting relationship to the areas of sensitive interconnecting circuitry contained within the connecting wires.

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