| 摘要 |
PROBLEM TO BE SOLVED: To improve muffled sensation peculiar to an ear hole type hearing aid and to avoid danger of howling.SOLUTION: An ear hole type hearing aid 10 includes: a hollow shell member 11 which is formed in a tapered short cylindrical shape so that it is adapted to a shape of an external auditory canal inlet and in which a sound hole 112 is formed at a tip directed to an eardrum side; and a face plate 12 for covering an end face on a side opposite to the sound hole of the shell member. Pairs of battery contact pieces 13 and microphones 14 are arranged on an inner face of the face plate 12, and an amplifier 15 and a receiver 16 are stored inside the shell member 11. A plurality of dimples 111 are equally distributed and arranged on a surface of the shell member 11. |
