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Electronic blackboard system

  • US 6,518,960 B2
  • Filed: 04/27/1999
  • Issued: 02/11/2003
  • Est. Priority Date: 07/30/1998
  • Status: Expired due to Term
First Claim
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1. An electronic blackboard system, comprising:

  • a plasma display configured to display characters and images on a display surface thereof;

    a touch input device with a touch panel surface provided on the display surface to form an electronic blackboard;

    a printer configured to print image data onto a recording paper;

    a personal computer configured to control displays provided by the plasma display as well as printing operations of the printer according to input from the touch input device;

    a frame unit including, an upper section configured to hold the display surface and the touch panel surface forming the electronic blackboard at a specified height, a printer section positioned below the upper section and configured to accommodate the printer, and a personal computer section positioned below the printer section and configured to accommodate the personal computer, wherein said touch input device includes, a transmitting unit configured to transmit surface elastic waves onto the touch panel surface, a reflecting unit configured to reflect the surface elastic waves propagating on the touch panel surface from the transmitting unit, and a receiving unit connected to the personal computer via a signal line and configured to receive the surface elastic waves reflected by said reflecting unit and to input a signal to the personal computer via the signal line, said signal being representative of a coordinate of a touch position on the touch panel surface according to an attenuation rate of the surface elastic waves; and

    an L-shaped substantially flat shielding member configured to block off electromagnetic waves generated by the plasma display from interfering with the signal input to the personal computer, and provided between the plasma display and the touch input device at a position where the signal line is connected to the receiving unit and so as to not contact the reflecting unit of the touch input device.

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