| 摘要 |
PURPOSE: A receiving unit of a portable communication terminal is provided to reduce an unnecessary space of a portable communication terminal by using a yoke sharing magnetic circuits of a permanent magnet, a receiver, and a speaker. CONSTITUTION: A receiving unit(10) has a frame(13) including a permanent magnet(15), a diaphragm(21), and a voice coil(22). A speaker portion(11) is installed at one side of the frame(13) in order to output a calling sound. A receiver portion(12) is installed at the other side of the frame(13) in order to output a dial tone. A ventilation hole(18) is formed in the frame(13). A ring-shaped permanent magnet(15), a yoke(16), and a support portion(17) are installed in the frame(13). An upper and a lower ring-shaped tip plate(14,28) is adhered to the ring-shaped permanent magnet(15). The support portion is used for adhering the yoke(16) to the top plates(14,28). A PCB(23) is installed to supply electric power to the speaker portion(11) and the receiver portion(12).
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