Ultra-low-power wearable computing
Sensing the magnetic coupling between a ring coil and a wristband coil lets a ring work as an input device with no radio on the ring — over a month of use on a single charge.
A ring can hold less than 27 mAh of battery. Conventional radios such as BLE are too power-hungry for that budget, so a wireless ring lasts only 1-10 hours of continuous use, and frequent recharging keeps interrupting the interaction.
picoRing puts no radio on the ring at all. A wristband coil reads the frequency response of the nearby ring coil through semi-passive inductive telemetry, and the ring modulates that response with at most 449 microwatts. One charge lasts roughly 600-1000 hours. The goal is an input device you can keep wearing all day, for instance as a controller for AR glasses.
Publications12
Journal2
Ultra-Low-Power Wireless Ring Mouse
Electronics and Communications in Japan, 146(7), pp.186-192 (August 2026).
@article{Takahashi_2026,
title={Ultra‐Low‐Power Wireless Ring Mouse},
volume={109},
ISSN={1942-9541},
url={http://dx.doi.org/10.1002/ecj.70049},
DOI={10.1002/ecj.70049},
number={3},
journal={Electronics and Communications in Japan},
publisher={Wiley},
author={Takahashi, Ryo and Yifan, Li and Fukumoto, Masaaki and Noda, Akihito and Ishida, Shigemi and Yokota, Tomoyuki and Someya, Takao and Kawahara, Yoshihiro},
year={2026},
month=Aug,
pages={88–93}
}picoRing mouse:極低電力な指輪型無線マウス
電気論文誌E, 146巻,7号 (July 2026).
@article{Takahashi_2026,
title={Ultra-low-power Wireless Ring Mouse},
volume={146},
ISSN={1347-5525},
url={http://dx.doi.org/10.1541/ieejsmas.146.186},
DOI={10.1541/ieejsmas.146.186},
number={7},
journal={IEEJ Transactions on Sensors and Micromachines},
publisher={Institute of Electrical Engineers of Japan (IEE Japan)},
author={Takahashi, Ryo and Yifan, Li and Fukumoto, Masaaki and Noda, Akihito and Ishida, Shigemi and Yokota, Tomoyuki and Someya, Takao and Kawahara, Yoshihiro},
year={2026},
month=July,
pages={186–192}
}Conference4
picoRing dual: ultralow-power bimanual ring controllers for everyday AR
Proceedings of the 2026 ACM International Symposium on Wearable Computers (ISWC '26), To appear (October 2026).
@inproceedings{yamamoto2026picoring,
title = {picoRing dual: ultralow-power bimanual ring controllers for everyday AR},
author = {H. Yamamoto and Y. Li and Y. Kawahara and R. Takahashi},
booktitle = {Proceedings of the 2026 ACM International Symposium on Wearable Computers (ISWC '26)},
note = {To appear},
year = {2026},
month = oct
}Ultra-low-power ring-based wireless tinymouse
Proceedings of the 38th Annual ACM Symposium on User Interface Software and Technology (ACM UIST), Article 22, 1-12, Busan, Korea (October 2025).
@inproceedings{Li_2025,
series={UIST ’25},
title={Ultra-low-power ring-based wireless tinymouse},
url={http://dx.doi.org/10.1145/3746059.3747615},
DOI={10.1145/3746059.3747615},
booktitle={Proceedings of the 38th Annual ACM Symposium on User Interface Software and Technology},
publisher={ACM},
author={Li, Yifan and Fukumoto, Masaaki and Kari, Mohamed and Ishida, Shigemi and Noda, Akihito and Yokota, Tomoyuki and Someya, Takao and Kawahara, Yoshihiro and Takahashi, Ryo},
year={2025},
month=Sept,
pages={1–12},
collection={UIST ’25}
}picoRing: battery-free rings for subtle thumb-to-index input
Proceedings of the 37th Annual ACM Symposium on User Interface Software and Technology (UIST'24), Article No. 13, pp. 1-11, Pittsburgh, USA (October 2024).
@inproceedings{Takahashi_2024,
series={UIST ’24},
title={picoRing: battery-free rings for subtle thumb-to-index input},
url={http://dx.doi.org/10.1145/3654777.3676365},
DOI={10.1145/3654777.3676365},
booktitle={Proceedings of the 37th Annual ACM Symposium on User Interface Software and Technology},
publisher={ACM},
author={Takahashi, Ryo and Whitmire, Eric and Boldu, Roger and Ng, Shiu and Kienzle, Wolf and Benko, Hrvoje},
year={2024},
month=Oct,
pages={1–11},
collection={UIST ’24}
}TelemetRing: A Batteryless and Wireless Ring-Shaped Keyboard using Passive Inductive Telemetry
Proceedings of the 33rd Annual ACM Symposium on User Interface Software and Technology (UIST’20), Pages 1161–1168, Virtual (previously Minneapolis, US) (October 2020).
@inproceedings{Takahashi_2020,
series={UIST ’20},
title={TelemetRing: A Batteryless and Wireless Ring-shaped Keyboard using Passive Inductive Telemetry},
url={http://dx.doi.org/10.1145/3379337.3415873},
DOI={10.1145/3379337.3415873},
booktitle={Proceedings of the 33rd Annual ACM Symposium on User Interface Software and Technology},
publisher={ACM},
author={Takahashi, Ryo and Fukumoto, Masaaki and Han, Changyo and Sasatani, Takuya and Narusue, Yoshiaki and Kawahara, Yoshihiro},
year={2020},
month=Oct,
pages={1161–1168},
collection={UIST ’20}
}Domestic6
picoRing NFC: 中距離NFCを用いた極低電力なワイヤレススマートリング
ROBOMECH 2026, 2A1-R04, 福岡 (June 2026).
@inproceedings{山本2026picoring,
title = {picoRing NFC: 中距離NFCを用いた極低電力なワイヤレススマートリング},
author = {山本英昂 and 高橋亮 and 川原圭博},
booktitle = {ROBOMECH 2026},
note = {2A1-R04},
address = {福岡},
year = {2026},
month = jun
}極低電力な指輪型無線マウス
「センサ・マイクロマシンと応用システム」シンポジウム, 第42回, 宇都宮 (November 2025).
奨励賞
@inproceedings{高橋2025x,
title = {極低電力な指輪型無線マウス},
author = {高橋亮 and Y. Li and 福本雅朗 and M. Kari and 野田聡人 and 石田繁巳 and 横田知之 and 染谷隆夫 and 川原圭博},
booktitle = {「センサ・マイクロマシンと応用システム」シンポジウム},
note = {第42回},
address = {宇都宮},
year = {2025},
month = nov
}指輪-リストバンドコイル間の磁気結合を用いた超低電力な指輪型無線XRコントローラの設計
信学ソ大2025, B-15-32, 岡山 (September 2025).
@inproceedings{山本2025xr,
title = {指輪-リストバンドコイル間の磁気結合を用いた超低電力な指輪型無線XRコントローラの設計},
author = {山本英昂 and 李蘊韜 and 韓燦教 and 横田知之 and 染谷隆夫 and 川原圭博 and 高橋亮},
booktitle = {信学ソ大2025},
note = {B-15-32},
address = {岡山},
year = {2025},
month = sep
}超低電力な指輪型無線マウス
情報処理学会 UBI研究会, 第87回, 富山 (September 2025).
優秀論文賞
@inproceedings{高橋2025x,
title = {超低電力な指輪型無線マウス},
author = {高橋亮 and Y. Li and 福本雅朗 and M. Kari and 山本英昂 and 野田聡人 and 石田繁巳 and 横田知之 and 染谷隆夫 and 川原圭博},
booktitle = {情報処理学会 UBI研究会},
note = {第87回},
address = {富山},
year = {2025},
month = sep
}picoRing: バッテリーレスな指輪型入力デバイス 招待論文
第32回インタラクティブシステムとソフトウェアに関するワークショップ(WISS2024), 国際学会招待発表枠, 日本 (December 2024).
@inproceedings{takahashi2024picoring,
title = {picoRing: バッテリーレスな指輪型入力デバイス},
author = {R. Takahashi and E. Whitmire and R. Boldu and S. Ng and W. Kienzle and H. Benko},
booktitle = {第32回インタラクティブシステムとソフトウェアに関するワークショップ(WISS2024)},
note = {国際学会招待発表枠},
address = {日本},
year = {2024},
month = dec
}ワイヤレスな指輪型キーボードのバッテリレス化手法
信学総大 2020, B-15-13, 広島,日本 (March 2020).
@inproceedings{高橋2020x,
title = {ワイヤレスな指輪型キーボードのバッテリレス化手法},
author = {高橋亮 and 韓燦教 and 笹谷拓也 and 成末義哲 and 福本雅朗 and 川原圭博 and 苗村健},
booktitle = {信学総大 2020},
note = {B-15-13},
address = {広島,日本},
year = {2020},
month = mar
}