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Paper Abstract and Keywords
Presentation 2014-06-27 13:00
Loudspeaker systems for low frequency radiation by rotational type piezoelectric ultrasonic actuators
Daichi Nagaoka (Tokyo Univ. of Tech.), Juro Ohga (Shibaura Inst. of Tech./MIX Corp.), Hirokazu Negishi (MIX Corp.), Ikuo Oohira, Kazuaki Maeda (TOA), Kunio Oishi (Tokyo Univ. of Tech.) EA2014-5
Abstract (in Japanese) (See Japanese page) 
(in English) Conventional electrodynamic loudspeakers actuated by a permanent magnet and a coil seem almighty.However,they include fundamental limitations in its performance,especially in its characteristics at very low frequency region.Ordinary direct-radiator loudspeaker diaphragms show a remarkable resonance whose frequency is called as $f_0$.To avoid this defect,use of an electromechanical transducer with large mechanical impedance for a driver is necessary. Therefore,the authors developing a completely new direct-radiator transducer.An interesting tool is use of piezoelectric ultrasonic motors.This sort of motor is characterized by very high mechanical impedance because its rotor contacts its stator tightly.In this paper,the authors are going to present a practical model of this loudspeaker driven by co-operation of four ultrasonic motors.
Keyword (in Japanese) (See Japanese page) 
(in English) Audio System / Loudspeaker / Woofer / Ultra Sonic Motor / Piezoelectric Ceramics / / /  
Reference Info. IEICE Tech. Rep., vol. 114, no. 112, EA2014-5, pp. 1-6, June 2014.
Paper # EA2014-5 
Date of Issue 2014-06-20 (EA) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
Download PDF EA2014-5

Conference Information
Committee EA  
Conference Date 2014-06-27 - 2014-06-27 
Place (in Japanese) (See Japanese page) 
Place (in English) Mie Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) General Topics 
Paper Information
Registration To EA 
Conference Code 2014-06-EA 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Loudspeaker systems for low frequency radiation by rotational type piezoelectric ultrasonic actuators 
Sub Title (in English)  
Keyword(1) Audio System  
Keyword(2) Loudspeaker  
Keyword(3) Woofer  
Keyword(4) Ultra Sonic Motor  
Keyword(5) Piezoelectric Ceramics  
1st Author's Name Daichi Nagaoka  
1st Author's Affiliation Tokyo University of Technology (Tokyo Univ. of Tech.)
2nd Author's Name Juro Ohga  
2nd Author's Affiliation Shibaura Institute of Technology/MIX Corporation (Shibaura Inst. of Tech./MIX Corp.)
3rd Author's Name Hirokazu Negishi  
3rd Author's Affiliation MIX Corporation (MIX Corp.)
4th Author's Name Ikuo Oohira  
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5th Author's Name Kazuaki Maeda  
5th Author's Affiliation TOA Corporation (TOA)
6th Author's Name Kunio Oishi  
6th Author's Affiliation Tokyo University of Technology (Tokyo Univ. of Tech.)
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Date Time 2014-06-27 13:00:00 
Presentation Time 30 
Registration for EA 
Paper # IEICE-EA2014-5 
Volume (vol) IEICE-114 
Number (no) no.112 
Page pp.1-6 
#Pages IEICE-6 
Date of Issue IEICE-EA-2014-06-20 

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