Abstract
In this study, a new subcutaneously implanted bone-conduction hearing aid with an external unit and an internal unit is proposed. The internal unit consists of a receiving coil, a driving coil, and a vibrator made of giant magnetostrictive material (GMM). AM signals were applied to the internal unit through mutual induction between a transmitting coil and the receiving coil, and the force generated by the GMM vibrator was measured with a piezoelectric force sensor. The high-frequency carrier signal was efficiently transmitted from the transmitting coil to the receiving coil, and the force with a component of audible frequency corresponding to the modulating frequency was generated with high intensity. This result suggests that the GMM vibrator had a function of self-demodulation, and a simple structured implanted bone-conduction hearing aid can be developed using GMM.
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