オオイシ　クニオ   大石　邦夫    所属   コンピュータサイエンス学部 コンピュータサイエンス学科    職種   教授
言語種別	英語
発行・発表の年月	2013/11
形態種別	国際会議論文
査読	査読あり
標題	Loudspeaker systems for low frequency radiation by piezoelectric ultrasonic actuator
執筆形態	共著
出版社・発行元	Proceedings of Symposium on Ultrasonic Electronics
巻・号・頁	34(3P4-9),pp.447-448
著者・共著者	Hiroya Saito, Juro Ohga, Hirokazu Negishi, Ikuo Oohira, Kazuaki Maeda, and Kunio Oishi
概要	Personal computers or audio-video equipment, which are recently becoming prevalent, are required function of voice and music reproduction. Conventional audio reproduction systems for thus function are not sufficient to meet taste of recent users. Sound presence and very low frequency reproduction ability should be checked. Especially, low frequency characteristics of loudspeaker device must be improved. The convention electro-dynamic loudspeaker includes limitation of development in low frequency response, because driving force of electro-dynamic transducer is induced indirectly, via an air gap. The authors propose a completely new loudspeaker construction by using piezoelectric ultrasonic actuators as a driver. The piezoelectric ultrasonic actuator is characterized by very high driving mechanical impedance because its mover contacts its stator tightly.