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Murakami Azuma C O Wacom Co Lt, Aoki Kazuo C O Wacom Co Ltd, Yamanami Tusguya C O Wacom Co, Tomofuji Yoshiaki C O Wacom Co, Tanaka Takeshi C O Wacom Co Lt, Inashima Satoshi C O Wacom Co, Funahashi Takahiko C O Wacom C, Chikami Toshihide C O Wacom Co, Senda Toshiaki C O Wacom Co Lt: Electronic blackboard and accessories such as writing tools.. Wacom, December 27, 1989: EP0347725-A2 (54 worldwide citation)

The present invention discloses an electronic blackboard apparatus comprising an electronic blackboard portion (1), a writing tool (3), an eraser (4), an instruction rod (2), a position detection portion (11), a writing tool determination portion, a data processing portion (5), and an output portion ...


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Murakami Azuma C O Wacom Co Lt, Yamanami Tuguya C O Wacom Co L, Funahashi Takahiko C O Wacom C, Senda Toshiaki C O Wacom Co Lt, Aoki Kazuo C O Wacom Co Ltd, Sugiyama Keiichi C O Wacom Co, Miyamori Nobuyuki C O Wacom Co, Kikuchi Akio C O Wacom Co Ltd, Abe Manabu C O Wacom Co Ltd: Position detecting device.. Wacom, July 5, 1989: EP0322675-A2 (4 worldwide citation)

A position detecting device provided with a position pointer (2) having a tuning circuit, a tablet (1) for position detection having an electric wave generator for generating an electric wave at a frequency equal to the resonance frequency of the tuning circuit and an electric wave detector for dete ...