Actuating compact wearable augmented reality devices by multifunctional artificial muscle

Dongjin Kim, Baekgyeom Kim, Bongsu Shin, Dongwook Shin, Chang-Kun Lee, Jae-Seung Chung, Juwon Seo, Yun-Tae Kim, Geeyoung Sung, Wontaek Seo, Sunil Kim, Sunghoon Hong, Sungwoo Hwang, Seungyong Han (), Daeshik Kang (), Hong-Seok Lee () and Je-Sung Koh ()
Additional contact information
Dongjin Kim: Ajou University
Baekgyeom Kim: Ajou University
Bongsu Shin: Samsung Advanced Institute of Technology, Samsung Electronics
Dongwook Shin: Ajou University
Chang-Kun Lee: Samsung Advanced Institute of Technology, Samsung Electronics
Jae-Seung Chung: Samsung Advanced Institute of Technology, Samsung Electronics
Juwon Seo: Samsung Advanced Institute of Technology, Samsung Electronics
Yun-Tae Kim: Samsung Advanced Institute of Technology, Samsung Electronics
Geeyoung Sung: Samsung Advanced Institute of Technology, Samsung Electronics
Wontaek Seo: Samsung Advanced Institute of Technology, Samsung Electronics
Sunil Kim: Samsung Advanced Institute of Technology, Samsung Electronics
Sunghoon Hong: Samsung Advanced Institute of Technology, Samsung Electronics
Sungwoo Hwang: Samsung Advanced Institute of Technology, Samsung Electronics
Seungyong Han: Ajou University
Daeshik Kang: Ajou University
Hong-Seok Lee: Samsung Advanced Institute of Technology, Samsung Electronics
Je-Sung Koh: Ajou University

Nature Communications, 2022, vol. 13, issue 1, 1-13

Abstract: Abstract An artificial muscle actuator resolves practical engineering problems in compact wearable devices, which are limited to conventional actuators such as electromagnetic actuators. Abstracting the fundamental advantages of an artificial muscle actuator provides a small-scale, high-power actuating system with a sensing capability for developing varifocal augmented reality glasses and naturally fit haptic gloves. Here, we design a shape memory alloy-based lightweight and high-power artificial muscle actuator, the so-called compliant amplified shape memory alloy actuator. Despite its light weight (0.22 g), the actuator has a high power density of 1.7 kW/kg, an actuation strain of 300% under 80 g of external payload. We show how the actuator enables image depth control and an immersive tactile response in the form of augmented reality glasses and two-way communication haptic gloves whose thin form factor and high power density can hardly be achieved by conventional actuators.

Date: 2022
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DOI: 10.1038/s41467-022-31893-1

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