| 摘要 |
PURPOSE: A chain coupling-type of ear-microphone device is provided to prevent a twisting of the ear-microphone device in case that a plurality of users use a cellular phone or an audio device simultaneously. CONSTITUTION: In a chain coupling-type of ear-microphone device, a phone plug(11a) is connected to a phone jack of a different ear-microphone body(12). An ear-microphone body(12) is connected to the phone plug and includes a pair of amplifiers(17,18), the first to fourth switches(13-16) and a pair of line connection parts(19). An ear-microphone and a phone jack are connected to the ear-microphone body. The ear-microphone device is composed of an earphone without a microphone. Therefore, a plurality of users use one cellular phone simultaneously.
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