A wireless ring-shaped keyboard supports text entry by detecting finger typing. However, the previous wireless ring-shaped keyboard requires batteries attached to each ring device to empower the active components (e.g., wireless communication module). The bulky batteries not only make the ring uncomfortable to wear, but also require the user to charge them periodically. Thus, we present a batteryless and wireless ring-shaped keyboard using passive inductive telemetry that wirelessly senses the passive sensor coil with the inductively coupled reader coil.

5本の指に装着した指輪型デバイスでタイピングの振動を検知し、文字入力を行うワイヤレスな指輪型キーボードがある。しかし、指輪へ無線通信モジュールなどを搭載するためバッテリが必要となり、嵩張るほか充電の手間も生じる。そこで、パッシブなセンサコイルとリーダコイル間での磁気的な結合を介し、無線センシングを行うパッシブインダクティブテレメトリを用いて、指輪型キーボードのワイヤレスかつバッテリレス化を行った。

R. Takahashi, M. Fukumoto, C. Han, T. Sasatani, Y. Narusue, Y. Kawahara, “TelemetRing: A Batteryless and Wireless Ring-Shaped Keyboard using Passive Inductive Telemetry (ACM UIST),” Proceedings of the 33rd Annual ACM Symposium on User Interface Software and Technology, pp 1161-1168, Virtual, Oct. 2020.