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Method and device for inputting coordinate-position and a display board system

  • US 6,828,959 B2
  • Filed: 12/04/2001
  • Issued: 12/07/2004
  • Est. Priority Date: 01/29/1999
  • Status: Expired due to Term
First Claim
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1. A system, comprising:

  • a device having a front writing surface and a back portion, the device being rigid;

    a support connected to the device;

    a frame configured to be attached to the device;

    a bracket attached to only one side of the frame without surrounding the frame and configured to prevent the frame from being removed from the device due to contact between the bracket and the back portion;

    a light source connected to the frame; and

    a light sensor connected to the frame.

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