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Planar coil apparatus employing a stationary and a movable board

  • US 4,425,511 A
  • Filed: 02/09/1981
  • Issued: 01/10/1984
  • Est. Priority Date: 02/09/1981
  • Status: Expired due to Fees
First Claim
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1. Apparatus for providing an output signal indicative of a movement between at least a first and a second position comprising:

  • (a) a first stationary planar member having disposed on a surface thereof a first flat serpentine coil structure, and at least a second flat serpentine coil structure adjacent thereto;

    with said coils positioned side by side;

    (b) means for applying a drive signal to said first coil;

    (c) a second movable planar member having disposed on a surface thereof a closed loop coil structure;

    (d) means for moving said second planar member in a direction transverse to said first member and overlying the same and in close proximity thereto to allow flux induced in said first coil to couple to said second coil, whereby as said second member is moved closer to said first member, the magnitude of said induced flux increases, and as said second member is moved further away from said first member, there is no flux induced in said second coil.

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