| 摘要 |
PURPOSE: A micro bone conduction speaker is provided to stimulate an auditory nerve and enable user to hear sound by vibrating directly a brainpan of a man. CONSTITUTION: A frame(12) is used for forming a sidewall of a speaker. A base plate(14) is used for forming a lower wall of the speaker. A predetermined space is limited by the frame(12) and the base plate(14). A protector(40) has an opening. An inside of the protector(40) is contacted with an upper portion of the sidewall. A damper(20) is used for performing a stable vibration process and reducing amplitudes of vibration and sound. A yoke(22) is installed within the space limited by the frame(12) and the base plate(14). The yoke(22) has a main body portion(22a) for supporting an internal end of the damper(20) and an extension portion(22b) in order to condense magnetic flux. A magnet(24) is arranged in an inside of the extension portion(22b). A magnetic circuit is formed by an upper plate(26), the yoke(22) and the magnet(24). The upper plate(26) is installed in an inside of the extension portion(22b). A fixing portion has a vibration contact portion in order to fix the protector(40), the yoke(22), the magnet(24), and the upper plate(26) with one body. A voice coil(13) is formed among the upper plate(26), both ends of the magnet(24), and an inner face of the extension portion(22b).
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