Patent ID: 6700129
Filing Date: 2004-03-02
Classification: G06F

Abstract:
An electronic board system comprising:a board including first and second infrared scanning beam generators for alternately generating infrared scanning beams for rotational scanning; a coordinates-inputting pen including a photodetector for detecting the infrared scanning beams, a pen-press switch for detecting a pen-press against the board, an electronic circuit for outputting time sequential signals based on the detection signal from the photodetector and the ON/OFF signals of the pen-press switch, and a light-emitting element for generating an optical signal based on the time sequential signals output from the electronic circuit; a light receiver arranged at a position away from the coordinates-inputting pen, for detecting the optical signal generated from the light-emitting element of the coordinates-inputting pen; and an electronic board controller for calculating the coordinates of the coordinates-inputting pen based on the output of the light receiver.