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An optimal design of the internal space in a micro-speaker module

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Abstract

The development of display and battery technologies has led to the miniaturization of smart devices. However, the acoustic performance of micro speakers using less than 1–2 cm3 of space has been limited. Internal space management for modules with limited internal volumes is a critical factor in the acoustic performance of mobile devices. Previous studies have mostly focused on improving the performance of a micro speaker itself. This study has sought to identify the characteristics of resonant space by performing an anechoic chamber experiment using the Taguchi method and by using the finite element analysis of a micro-speaker module. As a result, an optimum internal space was designed based on the effects of the structural characteristics of the interior of the microspeaker module on the acoustic performance. In particular, focus was placed on the rise in sound pressure at low frequencies and on the flatness of the sound pressure at high frequencies related to the size and shape of the internal space.

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Abbreviations

P :

Measured pressure

P ref :

Minimum audible sound pressure

SPL:

Sound press level

References

  1. Kwon, J. H., Hwang, S. M., and Kim, K. S., “Development of Slim Rectangular Microspeaker Used for Minimultimedia Phones,” IEEE Transactions on Magnetics, Vol. 43, No. 6, pp. 2704–2706, 2007.

    Article  Google Scholar 

  2. Hwang, G., Kim, K., Chung, S., Hwang, S., Kang, B., and Hwang, I., “Analysis of a Dynamic Speaker in Mobile Phones by Considering Mechanical, Electrical, and Magnetic Coupling Effects,” Journal of Applied Physics, Vol. 91, No. 10, pp. 6979–6981, 2002.

    Article  Google Scholar 

  3. Hwang, S. M., Hwang, G. Y., Park, S. H., Kang, B. S., and Lee, D. W., “Performance Design of a Dynamic Receiver for Personal Communication Devices using Finite Element Method,” Journal of Magnetism and Magnetic Materials, Vol. 226, pp. 1235–1236, 2001.

    Article  Google Scholar 

  4. Kim, W., Jang, G. W., and Young Kim, Y., “Microspeaker Diaphragm Optimization for Widening the Operating Frequency Band and Increasing Sound Pressure Level,” IEEE Transactions on Magnetics, Vol. 46, No. 1, pp. 59–66, 2010.

    Article  Google Scholar 

  5. Hong, D. K., Woo, B. C., Kim, D. Y., and Ahn, C. W., “A Study on the Shape Design of Micro Speaker Diaphragm,” Transactions of the Korean Society for Noise and Vibration Engineering, Vol. 15, No. 7, pp. 775–780, 2005.

    Article  Google Scholar 

  6. Lee, C. M., Kwon, J. H., Kim, K. S., Park, J. H., and Hwang, S. M., “Design and Analysis of Microspeakers to Improve Sound Characteristics in a Low Frequency Range,” IEEE Transactions on Magnetics, Vol. 46, No. 6, pp. 2048–2051, 2010.

    Article  Google Scholar 

  7. Hwang, S. M., Lee, H. J., Hong, K. S., Kang, B. S., and Hwang, G. Y., “New Development of Combined Permanent-Magnet Type Microspeakers Used for Cellular Phones,” IEEE Transactions on Magnetics, Vol. 41, No. 5, pp. 2000–2003, 2005.

    Article  Google Scholar 

  8. Kim, W. C. and Kim, Y. Y., “Magnetic Circuit Design by Topology Optimization for Lorentz Force Maximization in a Microspeaker,” Journal of Mechanical Science and Technology, Vol. 22, No. 9, pp. 1699–1706, 2008.

    Article  Google Scholar 

  9. Kim, I. K., Kim, W., and Kim, Y. Y., “Magnetostrictive Grating with an Optimal Yoke for Generating High-Output Frequency-Tuned SH Waves in a Plate,” Sensors and Actuators A: Physical, Vol. 137, No. 1, pp. 141–146, 2007.

    Article  Google Scholar 

  10. Kim, W. and Young Kim, Y., “Design of a Bias Magnetic System of a Magnetostrictive Sensor for Flexural Wave Measurement,” IEEE Transactions on Magnetics, Vol. 40, No. 5, pp. 3331–3338, 2004.

    Article  Google Scholar 

  11. Dyck, D. N. and Lowther, D. A., “Automated Design of Magnetic Devices by Optimizing Material Distribution,” IEEE Transactions on Magnetics, Vol. 32, No. 3, pp. 1188–1193, 1996.

    Article  Google Scholar 

  12. Hwang, S. M., Hwang, G. Y., Kwon, J. H., Lee, H. J., and Kang, B. S., “Performance Comparison between Circular and Elliptical Type Microspeakers for Cellular Phones,” IEEE Transactions on Magnetics, Vol. 39, No. 5, pp. 3256–3258, 2003.

    Article  Google Scholar 

  13. Hwang, S. M., Hwang, G. Y., Park, S. H., Kang, B. S., and Lee, D. W., “Performance Design of a Dynamic Receiver for Personal Communication Devices using Finite Element Method,” Journal of Magnetism and Magnetic Materials, Vol. 226, pp. 1235–1236, 2001.

    Article  Google Scholar 

  14. Kim, K. M. and Park, K., “Numerical Investigation on Vibration Characteristics of a Micro-Speaker Diaphragm Considering Thermoforming Effects,” Journal of Mechanical Science and Technology, Vol. 27, No. 10, pp. 2923–2928, 2013.

    Article  Google Scholar 

  15. Lee, T. K., Kim, B. S., and Cho, T. J., “A Study on the Acoustical Properties of Micro-Speaker according to Comb Teeth Shape of the Diaphragm,” Transactions on Korean Society of Mechanical Engineering, Vol. 17, No. 6, pp. 124–131, 2008.

    MathSciNet  Google Scholar 

  16. Park, J. W., Hong, D. K., Choi, J. G., and Ahn, C. W., “Geometrical Optimum Design of Micro Speaker' Diaphragm using Response Surface Methodology,” Proc. of KSME Conference, Vol. 2007, No. 6, pp. 107–112, 2007.

    Google Scholar 

  17. Hong, D. K., Woo, B. C., and Ahn, C. W., “A Study on Performance Improvement of Diaphgram for Micro Speaker using Table of Orthogonal Array,” Proc. of KSPE Confernece, Vol. 2004, pp. 298–301, 2004.

    Google Scholar 

  18. Bai, M. R., Ching Yu, L., and Rong Liang, C., “Optimization of Microspeaker Diaphragm Pattern using Combined Finite Element-Lumped Parameter Models,” IEEE Transactions on Magnetics, Vol. 44, No. 8, pp. 2049–2057, 2008.

    Article  Google Scholar 

  19. Fletcher, H. and Munson, W. A., “Loudness, Its Definition, Measurement and Calculation,” Bell System Technical Journal, Vol. 12, No. 4, pp. 377–430, 1933.

    Article  Google Scholar 

  20. Sean, O., Todd, W., and Elisabeth, M., “Listener Preferences for In-Room Loudspeaker and Headphone Target Responses,” Proc. of 135th Audio Engineering Society, Paper No. 8994, 2013.

    Google Scholar 

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Authors and Affiliations

  1. School of Mechanical Engineering, Sogang University, 35, Baekbeom-ro, Mapo-gu, Seoul, 121-742, South Korea

    Dong-Cheol Kim & Hyun-Yong Jeong

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  1. Dong-Cheol Kim
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  2. Hyun-Yong Jeong
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Correspondence to Hyun-Yong Jeong.

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Kim, DC., Jeong, HY. An optimal design of the internal space in a micro-speaker module. Int. J. Precis. Eng. Manuf. 16, 1141–1147 (2015). https://doi.org/10.1007/s12541-015-0148-4

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  • DOI: https://doi.org/10.1007/s12541-015-0148-4

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