| 摘要 |
<p>PURPOSE:To transmit the state of plural switch operations without the need of a code and a battery by providing plural tuning circuits which are composed of switches and in which tuning frequencies are different. CONSTITUTION:When either switch among plural switches 121a and 121b is operated, the corresponding tuning circuits 12a and 12b are constituted. The tuning circuits 12a and 12b reflect radio waves originated from the tablet of a coordinate input device, and the tuning frequencies of the tuning circuits 12a and 12b are different from each other. The frequencies of the reflected radio waves is different at every tuning circuit 12a or 12b. Thus, the state of the operated switches is transmitted. Thus, it can be transmitted to the coordinate input device which of the switches 121a or 121b is operated, and the designation of colors and erasure can be executed.</p> |
