| 摘要 |
PURPOSE: An earphone having an air controlling device is provided to adjust the size of the earphone with the air controlling device and to prevent external noises from interfering with the earphone output. CONSTITUTION: In an earphone having an air controlling device, a speaker(13) has a blocking device(11) in a frame(14). A speaker pocket(11) surrounds the back side and the external part of the speaker(13). An air bag(18) is located tightly between the blocking device(11) and the open flange(11a) of the speaker pocket(11) and forms an air chamber(18c). A thin tube(20) is connected to the open hole(19) of the air bag(18). An air injector(21,23) injects external air into the air chamber(18c) of the air bag(18). The air injector(21,23) is connected to the end of the thin tube(20).
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