An electromagnetically actuated micromachined loudspeaker for hearing aids applications

Sang Soo Je, Junseok Chae

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Scopus citations

Abstract

We present an electromagnetically actuated micromachined loudspeaker for hearing aid applications. The device has multi-layers of copper-coils, a NiFe soft magnet on polyimide membrane, and a NdFeB permanent magnet on its perimeter. Coil impedance is measured as 1.5 Ω and shows very flat at all over the audio frequency range. The resonant frequency of the loudspeaker is at much away from human audio frequency range to avoid unwanted spike responses. The device operates in low power, only requires tens of milli-ampere; the peak displacement, 7 urn, occurs at 88 mA, which corresponds to 110 dB SPL (Sound Pressure Level). While the micro-speaker generates 106 dB SPL, it consumes only 0.13 mW at 1 kHz, which is more than at least 10 times less power consumption than any existing MEMS (Micro-Electro-Mechanical-Systems) microspeakers, almost equivalent to existing non-MEMS minispeakers being used in hearing aids.

Original languageEnglish (US)
Title of host publicationThe 6th IEEE Conference on SENSORS, IEEE SENSORS 2007
Pages1024-1027
Number of pages4
DOIs
StatePublished - Dec 1 2007
Event6th IEEE Conference on SENSORS, IEEE SENSORS 2007 - Atlanta, GA, United States
Duration: Oct 28 2007Oct 31 2007

Publication series

NameProceedings of IEEE Sensors

Other

Other6th IEEE Conference on SENSORS, IEEE SENSORS 2007
CountryUnited States
CityAtlanta, GA
Period10/28/0710/31/07

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ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Je, S. S., & Chae, J. (2007). An electromagnetically actuated micromachined loudspeaker for hearing aids applications. In The 6th IEEE Conference on SENSORS, IEEE SENSORS 2007 (pp. 1024-1027). [4388579] (Proceedings of IEEE Sensors). https://doi.org/10.1109/ICSENS.2007.4388579