| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce the size of an earphone while widening a bass area.SOLUTION: An earphone body 14 of an earphone includes: a driver 20 for radiating a sonic wave toward the front and back of a diaphragm; and a case 30 that regulates the space of a cavity 31 on the back side of the driver 20 and has a first sound hole 40 for guiding the sonic wave 22 radiated forward to the external auditory canal of a user and a second sound hole 42 for guiding the sonic wave 24 radiated backward to the external auditory canal. The case 30 includes: a duct 36 communicating with the second sound hole 42; a first acoustic resistance member 50 to be arranged inside the duct 36; and a second acoustic resistance member 52 for covering the case inside opening of the duct 36.</p> |
