| 摘要 |
PROBLEM TO BE SOLVED: To cut back external noise and make a sound from an earphone easy to catch when using a closed earphone, and to reduce sound leakage that causes discomfort to other people.SOLUTION: An ear tip is attached to a sound guide tube, or a sound guide tube adapted to the shape of an ear hole is used, so as to increase airtightness. Internal and external spaces of an enclosure in which an electro-acoustic transducer is accommodated do not communicate acoustically with each other, and the internal space of the enclosure is divided into a front space and a rear space by a partitioning wall and the electro-acoustic transducer, the front space and the rear space being communicated with each other by a communicating tube that forms a relatively small tubular space.SELECTED DRAWING: Figure 2 |
