| 摘要 |
PROBLEM TO BE SOLVED: To provide a hearing aid with a liquid-state material infiltration prevention structure preventing a liquid-state material such as liquid-state earwax or oil secreted inside external auditory meatus from being infiltrated into the hearing aid. SOLUTION: An earwax prevention chip 5 comprised of a paper or nonwoven fabric filter 11 is provided in the sound hole of an ear hole type hearing aid 1. Since the paper or nonwoven fabric filter 11 is excellent in absorption of a liquid-state material such as liquid-state earwax or oil secreted inside external auditory meatus, the liquid-state material is prevented from being infiltrated into the ear hole type hearing aid 1. Furthermore, a hole 11a is bored at the center of the filter 11, so that even when the filter 11 absorbing the liquid-state material is clogged, a sound is emitted from the hole 11a. COPYRIGHT: (C)2005,JPO&NCIPI
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