Highly stretchable vibrating device using liquid metal

Abstract

Until now, a lot of stretchable device is proposed. In this study, a highly stretchable vibrating element was developed by mounting a planar coil of liquid metal on a magnetic elastomer with oriented magnetic particles. The planar coil of liquid metal was fabricated by photolithography and showed a stable resistance value. The device was able to generate a peak sound pressure in the frequency range of 500 Hz to 20,000 Hz, which is the audible frequency range of humans. Furthermore, a cartilaginous conduction device was realized by molding magnetic elastomers into the form of ear shapes and achieved the functionality of a speaker with high adhesion to ears.