| 摘要 |
PROBLEM TO BE SOLVED: To provide a sound absorbing transmitted sound conveying ear plug that can reproduce low, medium and high frequency sounds heard by hearing-impaired persons in their everyday life and found detrimental to their health into normal, natural and soft sounds audible to them.SOLUTION: A sound absorbing type transmitted sound conveying ear plug 1 is equipped with an external acoustic opening sponge 2 that can be inserted into an external acoustic opening and held therein, and an acoustic plate A3 in contact with an externally open end face of the external acoustic opening sponge 2, shaped to match the shape of the same face of the end of the external acoustic opening and stuck to it. The ear plug 1 can prevent sounds from diffraction by clogging the ear hole open outside with the acoustic plate A3. Also, the acoustic plate A3 converts sound wave energy into thermal energy to reduce the reverberation of the sound. Therefore, the ear plug 1 can convey only transmitted sounds from the external auditory canal to the eardrum.SELECTED DRAWING: Figure 2 |
