Graphic communication apparatus
First Claim
Patent Images
1. Graphic communication apparatus, comprising, in combination:
- a writing surface;
pen means movable on the writing surface for graphically portraying information on the writing surface;
input signal means for providing an input signal to the pen means;
pen coil means, including a plurality of pen coils, disposed in the pen means for producing a magnetic field in response to the input signal as the pen moves on the writing surface;
sense coil means for sensing the magnetic field produced by the pen coil means and for producing output signals in response thereto, includingX direction sense coil means for sensing the magnetic field produced by the pen coil means in an X direction, andY direction sense coil means for sensing the magnetic field produced by the pen coil means in a Y direction; and
circuitry means connected to the sense coil means for receiving the output signal from the sense coil means and for producing an output signal representative of the location of the pen means on the writing surface.
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Abstract
Graphic communication apparatus for electronically writing information and transmitting includes a pen having a pair of windings disposed in a predetermined angular relation with respect to each other, and a writing surface having a plurality of windings arranged substantially parallel to each other for sensing the presence of the pen from the magnetic fields of the pen coils to provide differential outputs over the writing surface with respect to the windings of the pen apparatus, and the differential outputs being located with respect to the writing surface in an X--Y orientation.
59 Citations
20 Claims
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1. Graphic communication apparatus, comprising, in combination:
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a writing surface; pen means movable on the writing surface for graphically portraying information on the writing surface; input signal means for providing an input signal to the pen means; pen coil means, including a plurality of pen coils, disposed in the pen means for producing a magnetic field in response to the input signal as the pen moves on the writing surface; sense coil means for sensing the magnetic field produced by the pen coil means and for producing output signals in response thereto, including X direction sense coil means for sensing the magnetic field produced by the pen coil means in an X direction, and Y direction sense coil means for sensing the magnetic field produced by the pen coil means in a Y direction; and circuitry means connected to the sense coil means for receiving the output signal from the sense coil means and for producing an output signal representative of the location of the pen means on the writing surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification