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Electrostatic Polarization Process Control: A Case Study on Electret Condenser Microphone Production Line

机译：静电极化过程控制：以驻极体电容麦克风生产线为例

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摘要

With a large growth potential, manufacturing of microphones with least rejection becomes inevitable. A case study was conducted to investigate the possible causes of microphone rejection. The polarization voltage developed on the microphone diaphragm has a direct effect on the microphone sensitivity. Hence, variation in the polarization voltage was investigated. Initial studies were conducted with an arrangement of fixture plate (bearing holes for holding microphones) that was placed on 2 base (support) plates. The investigations were carried out for 23 microphone positions across 11 readings. The acceptable and non-acceptable polarization voltages were earmarked (designated) and failure percentage was determined. Further, one base plate was removed to increase the distance between top electrode and diaphragm and polarization voltage was measured. The result showed an appreciable reduction in the polarization voltage that indicated a promising reduction in the microphone failure. For a representative electret condenser microphone, a non-linear variation between sensitivity and polarization voltage was established. Statistical analysis revealed that measurement data is symmetric and distributed normally. The proposed modification when implemented on the shop floor reduced rejection from 33% to 16%.
机译：具有巨大的增长潜力，制造具有最低拒绝率的麦克风变得不可避免。进行了一个案例研究，以调查麦克风拒绝的可能原因。麦克风振膜上产生的极化电压直接影响麦克风的灵敏度。因此，研究了极化电压的变化。最初的研究是通过将固定板（用于固定麦克风的轴承孔）放置在2个基础（支撑）板上进行的。对11个读数的23个麦克风位置进行了调查。指定（指定）可接受和不可接受的极化电压，并确定故障百分比。此外，移除一块基板以增加顶部电极和隔膜之间的距离，并测量极化电压。结果表明极化电压显着降低，表明麦克风故障有望降低。对于代表性的驻极体电容麦克风，建立了灵敏度和极化电压之间的非线性变化。统计分析表明，测量数据是对称的，且呈正态分布。在车间实施时，建议的修改将拒绝率从33％降低到16％。

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  • 来源
    《Journal of the Audio Engineering Society》 |2017年第4期|321-332|共12页
  • 作者

    S. J. PAWAR; YANG DANE-JONG; HONG CHING HER; AND J. H. HUANG;

  • 作者单位

    Department of Applied Mechanics, Motilal Nehru National Institute of Technology Allahabad, Allahabad (UP), Pin - 211004, India;

    Electroacoustic Graduate Program and Department of Mechanical and Computer-Aided Engineering, Feng Chia University, Taichung 40724, Taiwan, Republic of China;

    Merry Electronics Co., Ltd. Taichung, Taiwan, Republic of China;

    Electroacoustic Graduate Program and Department of Mechanical and Computer-Aided Engineering, Feng Chia University, Taichung 40724, Taiwan, Republic of China;

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