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Input device for a display system using phase-encoded signals

  • US 4,745,402 A
  • Filed: 02/19/1987
  • Issued: 05/17/1988
  • Est. Priority Date: 02/19/1987
  • Status: Expired due to Term
First Claim
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1. A display system, comprising:

  • remote transmitting means, subject to movement, for producing a signal when energized;

    means for receiving said signal;

    said remote transmitting means having a pointing axis, said remote transmitting means being intended to be operated by a user at a distance substantially displaced from said receiving means along a line of sight between said remote transmitting means and said receiving means;

    means having a display surface and coupled to said receiving means for displaying an index at a point derived from said signal; and

    a plurality of transducers mounted on said transmitting means and physically disposed so as to enable said receiving means to determine the position of said index at said point on said display surface, said index exhibiting movement relative to movement of said transmitting means;

    said transducers being energized with energizing signals which are phase-shifted such that oppositely oriented transducers are energized with oppositely phase-shifted energizing signals;

    said signals being combined at said receiver to produce a resultant signal having a phase angle which varies in response to the angular position of said pointing axis of said remote transmitting means relative to said line of sight between remote transmitting means and said receiving means.

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