摘要
助聽器依結構可分為口袋型、耳掛型、耳內型、眼鏡型等類別。耳塞式助聽器的電子元件易因潮濕而故障，所以必須定期保養、除溼，才可正常使用。一般人所使用的耳罩式或耳塞式耳機，有時因音量過大，配帶時會造成聽力的損毀，並且使用時會阻隔外界聲音，在許多場合都有安全上的顧慮。此研究計畫研製輕型的震動傳導式助聽器，希望將來能給聽障者，甚至一般人在傳統耳塞式耳機之外，能有另一種選擇。此研究考慮阻抗匹配設計電磁線圈，並使用電腦分析磁場分佈決定線圈與磁鐵的相對位置。模擬動態機械震動，以了解配帶時的震動幅度，更利用電腦軟體FEMLAB做磁力系統模擬，分析震動度最大的磁力點，並利用FEMLAB有限元素法分析求解，模擬電流通過線圈時，系統的磁通密度分佈，使用程式模擬底部磁鐵對頂部磁鐵的磁通密度影響，結果顯示當頂部磁鐵上下切齊線圈時，震動度將最大，並由實驗及理論證明線圈以對稱方式纏繞可產生最大磁力。 本計劃完成了小型震動式助聽器的設計製作，當聲音經由麥克風輸入後，音源訊號可透過放大器將聲音放大，此音頻訊號會驅動骨導式震動耳機產生震動，若配戴於頭顱上，即可清楚聽見聲音。實驗與模擬皆顯示震動耳機之震動幅度約為100μm。由實際組織震動量測顯示，軟組織比硬組織更具震動效果。此骨導式助聽器具有低阻尼、低摩擦力的機械結構，可以使能量有效率的透過組織傳遞，並實際可使聽障者聽到聲音。
並列摘要
Hearing aids has many different styles. Each of them has its own unique qualities to meet individual’s needs. For those fit in the ear canal, the corrosion of components caused by moisture and accumulation of ear wax are problems that require frequent maintenance. Although the ear plug styles are the most popular hearing-aid devices, the bone-conducting style still has its own niche. The bone-conducting hearing-aid also can be designed as an earphone for normal people without the disadvantage of blocking the background sound. The purpose of this project is to find out how to optimize the design of a light weight bone-conducting earphone. The considerations include the electrical match between the output impedance of the power amplifier and the driving coil, the impedance match of sound propagation, and the shapes and the relative positions of coil and magnet. A mechanical model was derived to simulate the magnitude of vibration. The magnetic field distribution of the system was simulated by using the finite element method. The results show that force can be most effectively delivered when the height and width of the coil are the same. The height of the magnet also has to match that of the coil. A small size of bone-conducting earphone with vibrating amplitude of 100 慆 was made with this study. The sound can be better heard putting on soft tissue than being pressed against the head bone. This is because the magnet can vibrate more freely against the soft tissue.