The authors have been developing a completely new direct-radiator loudspeaker construction which is driven by continuous revolution of piezoelectric ultrasonic motors. It converts continuous revolution of ultrasonic motors to reciprocal motion of a cone radiator. This loudspeaker shows almost flat phase frequency characteristics in low frequency region, because its radiating motion includes no resonance in the working frequency region. Therefore it is useful for radiation of the lowest frequency part of audio signal. At this convention, the authors are going to present a practical model of this loudspeaker driven by co-operation of four ultrasonic motors.

Authors: Ohga, Juro; Suzuki, Ryousuke; Ishikawa, Keita; Negishi, Hirokazu; Oohira, Ikuo; Maeda, Kazuaki; Kubota, Hajime
Affiliations: Chiba Institute of Technology, Narashino, Japan; I. Oohira and Associates, Yokohama, Japan; Shibaura Institute of Technology/MIX Corporation, Kamakura, Japan; TOA CorporationTakarazuka, Japan(See document for exact affiliation information.)
AES Convention: 132 (April 2012) Paper Number: 8670
Publication Date: April 26, 2012
Subject: Transducers

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