• The Journal of the Acoustical Society of Korea
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• v.28 no.4
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• pp.299-307
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• 2009

In this study, the acoustical properties of micro-speaker had been studied as a function of diaphragm patterns. The diaphragm was divided into two sections, such as edge and dome sides. The pattern change at each side affected the tensile strength of diaphragm. As a result, the resonance frequency was varied with the change. With increasing the number of pattern at the edge side, it was increased at the first, but it reversed to the exponential decrease of that. It increased due to the increase of tensile strength to be caused by using "U" type of drill and whirlwind pattern, and decreasing of drill angle at the edge side. However, it was decreased due to the decrease of tensile strength to be by increasing the number of radiation pattern and dome hight, and decreasing the dome radius at the dome side.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.26 no.1
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• pp.5-12
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• 2016

This paper describes the development process for vibration and acoustic characteristics of a balanced armature speaker. The design parameters were chosen in consideration of the influence of the bending stiffness of balanced armature which is the form of a cantilever structure in the speaker. For study of the performance of the speaker according to the design parameters, in the first step, we analyzed the characteristics of the velocity of the diaphragm to the electrical input. Next step, acoustic characteristics were analyzed by structural-acoustic coupled analysis. And the reliability of the analysis was verified by comparing the result of analysis with test results. Finally, we proposed a design method for implementing an enhanced balanced armature speakers through analysis method.

• Transactions of Materials Processing
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• v.23 no.1
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• pp.10-15
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• 2014

Recently, micro-speakers have attracted much attention due to their increasing demand in mobile devices. Micro-speakers use polymer diaphragms, which are manufactured from thin polymer film by the thermoforming process. The diaphragm is generally designed to be a circular membrane with a cross section consisting of a double dome structure, and a number of corrugations are located in the outer region to produce better sound quality. In the current study, a finite element (FE) analysis is performed for thermoforming, and the resulting thickness reduction in the corrugation regions is estimated. The estimated thickness distribution is used in further structural and modal FE analyses, from which the effects of local thickness reduction on the stiffness and vibration characteristics are determined.

• Proceedings of the Acoustical Society of Korea Conference
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• autumn
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• pp.503-504
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• 2004

휴대용 개인 단말기기(Personal digital assistants)의 높은 보급률에 따라 초소형 스피커(Micro-loudspeaker)의 수요가 급격히 증가하면서, 초소형 스피커의 성능 개선이 절실히 요구되고 있다. 본 연구에서는 초소형 스피커의 진동판 소재로 사용되는 폴리에틸렌 나프탈레이트(PEN)와 폴리에테르 이미르(PEI)의 수지 계열 진동판과 니켈(Ni) 진동판의 방사 효율을 비교 분석하여, 진동계의 관점에서 금속 진동판의 활용 가능성에 대해 고찰하였다.