| 摘要 |
PURPOSE: An earphone enabling a simultaneous hearing is provided, which enables more than two person to listen a sound being output from an acoustic device. CONSTITUTION: An earphone(100) comprises an electric wire(110) transferring an acoustic signal, an earphone jack inserted into an acoustic device by being connected to the electric wire, a speaker(130) transmitting an audio signal supplied through the earphone jack to the outside by being connected to the wire and a number of function buttons transmitting a control signal to the acoustic device according to an operation of an operator and controlling a volume by being connected to the wire. The earphone also comprises an amplifier which is designed on a printed circuit board of an operation panel(140) and amplifies the acoustic signal supplied from the earphone jack by being connected to the wire electrically, and a distributor distributing the acoustic signal amplified through the amplifier, and an earphone jack hole(170) which is connected to one output port of the distributor and is installed in a case of the operation panel.
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