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| 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 |
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| 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 | |
| Copyright and reproduction |
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) | |
| Download PDF | EA2014-5 |
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| 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 |
| Keyword(6) | |
| Keyword(7) | |
| Keyword(8) | |
| 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 |
| 4th Author's Affiliation | * (*) |
| 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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| Speaker | Author-1 |
| Date Time | 2014-06-27 13:00:00 |
| Presentation Time | 30 minutes |
| Registration for | EA |
| Paper # | EA2014-5 |
| Volume (vol) | vol.114 |
| Number (no) | no.112 |
| Page | pp.1-6 |
| #Pages | 6 |
| Date of Issue | 2014-06-20 (EA) |
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