Fabrication and Investigation of a High Sensitive Miniature Ribbon Microphone
| Autor: | Guan-Wei Chen, 陳冠位 |
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| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 96 This thesis presents the design and simulation of a miniature ribbon microphone. The miniaturization of traditional aluminum ribbon microphone used Micro-Electro-Mechanical System (MEMS). An asymmetrical coil structure was designed in order to electromotive force direction problem. The simulation and magnetic flux measurement were used to obtain optimum magnetic system of high sensitivity miniature ribbon microphone. It was found that the diaphragm made of polyimide could provide better sensitivity than those made of SU-8 and SixNy materials. Moreover, ribbon microphone is a pressure gradient type and the vibration velocity of diaphragm affected its sensitivity. Thus, this thesis proposed two type diaphragms, one is the ribbon diaphragm and the other is the whole diaphragm. The ribbon microphone was just only fixed in top and bottom edges. It results in quick velocity as compare with the whole diaphragm type doing, Thus the ribbon diaphragm type presents high sensitivity. Under the optimized polyimide structure, the responsivity of ribbon diaphragm is -54.8 dBV/Pa (@1kHz) that it is corresponding to 1.82 mV/Pa sensitivity. One the other hand, the responsivity of whole diaphragm is -57.1 dBV/Pa (@1kHz) that it is corresponding to 1.39 mV/Pa sensitivity. Correspondingly, the responsivity of the commercially traditional ribbon microphone is -50 dBV/Pa to -60 dBV/Pa (@1kHz). Obviously, the performance of a miniatured ribbon microphone can provide good performance and obtain the market requirement. It has achieved the market demand. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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