Mr. Yuichi Sugio Profile

Yuichi Sugio

at Ritsumeikan Univ

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Publications (2)

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Proceedings Article | 27 April 2007 Paper

Work of PZT ceramics sounder for sound source artificial larynx

Yuuichi Sugio, Ryota Kanetake, Akimitsu Tanaka, Katsutoshi Ooe

Proceedings Volume 6525, 65251H (2007) https://doi.org/10.1117/12.715742

KEYWORDS: Ferroelectric materials, Ceramics, Prototyping, Surface plasmons, Motion analysis, Shape analysis, Computer simulations, Doppler effect, Metals, Modulation

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We aim to develop the easy-to-use artificial larynx with high tone quality. We focus on using a PZT ceramics sounder as its sound source, because it is small size, low power consumption, and harmless to humans. But conventional PZT ceramics sounder have the problem that it cannot generate an enough sound in the low frequency range, thus they cannot be used for artificial larynx. Then, we aim to develop the PZT ceramics sounder which can generate enough volume in the low frequency range. If we can lower the resonance frequency of the sounder, it can generate low pitch sound easily. Therefore I created the new diaphragm with low resonance frequency. In addition, we could obtain the high amplitude by changing method of driving. This time, we report on the characteristic comparison of this new PZT ceramics sounder and conventional one. Furthermore, for this new one, we analyzed the best alignment of PZT ceramics and the shape of the diaphragm to obtain low resonance frequency and big amplitude. In fact we analyzed the optimization of the structure. The analysis is done by computer simulation of ANSYS and Laser Doppler Vibrometer. In the future, we will add intonation to the generated sound by input wave form which is developed concurrently, and implant the sounder inside of the body by the method of fixing metal to biomolecule which is done too. And so high tone quality and convenient artificial larynx will be completed.

Proceedings Article | 14 December 2006 Paper

Development of the new shape PZT ceramics sounder suitable for a sound source of artificial larynx

Katsutoshi Ooe, Ryota Kanetake, Yuuichi Sugio, Akimitsu Tanaka

Proceedings Volume 6416, 64160C (2006) https://doi.org/10.1117/12.695758

KEYWORDS: Ferroelectric materials, Ceramics, Prototyping, Metals, Shape analysis, Finite element methods, Acoustics, Analytical research, Actuators, Laser induced plasma spectroscopy

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Various speech production substitutes, which aim to reconstruct speech functions, have been developed and used practically by speech impaired individuals. However, conventional speech production substitutes have various drawbacks; therefore, perfect speech production substitutes are expected to be developed. We focused on the PZT ceramics sounder as a sound source in an electric drive artificial larynx. We first developed the artificial larynx that uses a PZT ceramic sounder and then evaluated its performance. The vocalized sound of the artificial larynx user shows good characteristics at the formant frequency, which is important for vowel discrimination. The characteristic feature of our artificial larynx is its individual structure, and this typical structure implies that the sound source and the implant are separated. This structure facilitates a high biocompatibility in our artificial larynx. In our previous work, the improvement in the acoustic characteristics of the sound source was described. The improvement is achieved by the optimization of the electric control and its structure. In this paper, we present the results of shape optimization and new shape PZT ceramics sounder evaluation. The optimized shape is decided on FEM analysis, and prototype PZT ceramics sounder based on above analysis is manufactured by way of trial. Additionally, the performance of prototype sounder is evaluated by acoustic analysis. Until now, we have researched about the immobilization of biomolecules onto the metal surface. It is believed that biomolecular immobilization on the sound source surface improves its biocompatibility. In the future, we aim to realize implantable sound sources that employ biomolecular immobilization technology.

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