Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Design of electromagnetic type transducer to drive round window with high efficiency

고효율 전자기형 정원창 구동 트랜스듀서의 설계

  • Lee, Jang-Woo (Graduate School of Electrical Engineering and Computer Science, Kyungpook National University) ;
  • Kim, Dong-Wook (Graduate School of Electrical Engineering and Computer Science, Kyungpook National University) ;
  • Kim, Myoung-Nam (Dept. of Biomedical Engineering, Kyungpook National University Hospital) ;
  • Cho, Jin-Ho (Graduate School of Electrical Engineering and Computer Science, Kyungpook National University)
  • 이장우 (경북대학교 대학원 전자전기컴퓨터학부) ;
  • 김동욱 (경북대학교 대학원 전자전기컴퓨터학부) ;
  • 김명남 (경북대학교 병원 의공학과) ;
  • 조진호 (경북대학교 대학원 전자전기컴퓨터학부)
  • Received : 2010.09.06
  • Accepted : 2010.10.25
  • Published : 2010.11.30
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Abstract

Implantable middle ear hearing devices(IMEHDs) have being actively studied to overcome the problems of conventional hearing aids. Vibration transducer, an output devices of IMEHDs, is attached on the ossicular chain and transmits mechanical vibration to cochlea. This approach allows us to hear more clear sound because mechanical vibration is effective to transfer high frequency acoustics, but occurs some problems such as fatigue accumulation to ossicular chian and reduction of vibration displacement caused by mass loading effect. Recently, many studies for the round window stimulation are announced, because it does not cause such problems. It have been studied by older transducers designed for attaching on ossicular chain. In this paper, we proposed a new electromagnetic transducer which consists of two magnets, three coils and a vibration membrane. The magnet assembly, magnet coupled in opposite direction, were placed in the center of three coils, and the optimum length of each coil generating maximum vibrational force was calculated by finite element analysis(FEA). The transducer was implemented as the calculated length of each coil, and measured vibration displacement. From the results, it is verified the vibration displacement can be improved by optimizing the length of coils.

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References

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