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Projector and projector accessory

  • US 7,185,987 B2
  • Filed: 10/08/2004
  • Issued: 03/06/2007
  • Est. Priority Date: 10/10/2003
  • Status: Active Grant
First Claim
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1. A projector, comprising:

  • an infrared photodetector for photodetecting infrared light that is emitted by an electronic pen that is manipulated on a screen and that is provided with an infrared light emission device and an ultrasonic generator; and

    at least two ultrasonic receivers that detect ultrasonic waves that are emitted by said electronic pen;

    said projector being provided with capability for acquiring a position of said electronic pen on said screen.

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