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Proceedings Paper

Light actuated speaker: high efficiency conversion from light energy to acoustic sound energy
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Paper Abstract

As one category of light-driven actuators, we propose a light-actuated device which outputs sound. To verify the feasibility of the concept of the light-actuated speaker, we performed experiments using a scheme where the light energy is first converted into an electrical current which then drives the connected speaker. The method seems rather indirect, but given the efficiency of the solar cell, which can reach around 25% with the use of an appropriate wavelength, and with the adoption of impedance matching between the solar cell and the speaker, a high overall conversion efficiency is expected. With its realization, it would be possible to create a sound system that is wireless and can be controlled remotely without the need of a power supply which will provide advantages over the conventional electronic transmission such as wireless operation with no external power source, and precise control of listening area compared to radio transmission. Possible applications include a sound guidance system for the visually impaired.

Paper Details

Date Published: 10 October 2007
PDF: 9 pages
Proc. SPIE 6715, Optomechatronic Actuators and Manipulation III, 671508 (10 October 2007); doi: 10.1117/12.754333
Show Author Affiliations
Ryo Hamamura, International Christian Univ. (Japan)
Hideki Okamura, International Christian Univ. (Japan)

Published in SPIE Proceedings Vol. 6715:
Optomechatronic Actuators and Manipulation III
Yves Bellouard; Yukitoshi Otani; Kee S. Moon, Editor(s)

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