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Electronic whiteboard and penholder used for the same

  • US 6,654,008 B2
  • Filed: 11/27/2001
  • Issued: 11/25/2003
  • Est. Priority Date: 11/27/2000
  • Status: Expired due to Term
First Claim
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1. An electronic whiteboard comprising:

  • a-1) an infrared light emitting unit for emitting infrared light, a-2) an ultrasonic wave emitting unit for emitting an ultrasonic wave, one of said infrared light and said ultrasonic wave indicates a color of the marker pen, a-3) color changeover means for changing the color of the marker pen which is indicated by the one of the infrared light and the ultrasonic wave, wherein said color changeover means includes i) at least one of a protrusion and a recess provided in the marker pen based on a color thereof, and ii) a switch for detecting at least one of the protrusion and the recess, and b) an electronic whiteboard main body for receiving one of the infrared light and the ultrasonic wave emitted from the penholder to obtain color information, which corresponds to the color of the marker pen and for obtaining information about a position of the penholder based on timing of receipt of the infrared light and the ultrasonic wave.

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