| 摘要 |
To provide a position detecting device with which the remaining amount of power supply stored in a position indicator can be recognized at plural levels. The position indicator is provided with a power storage formed of a battery or an electric double-layer capacitor, an alternating current (AC) signal generating circuit that generates an AC signal to be transmitted toward the tablet, a modulation circuit that modulates the AC signal according to position indicator information represented by a binary code, and an electricity remaining amount detecting circuit that detects the electricity remaining amount of the power storage. The frequency at which a specific bit of the position indicator information is set to 0 or 1 is changed according to the detected electricity remaining amount. The tablet is provided with information receiving means that receives the position indicator information from the position indicator, and detects the electricity remaining amount of the power storage from the frequency at which the specific bit of the received position indicator information is 0 or 1. |
