| 摘要 |
PROBLEM TO BE SOLVED: To provide an inner phone which prevents pressure increment due to the high sound pressure of reproducing sound or the like in an airtight space inside the external auditory meatus sealed by a protector of the inner phone put in the cavity of concha from acting on a diaphragm as repulsive force, adversely affecting the reproducing sound or damaging the diaphragm. SOLUTION: In the inner phone, a communicating path communicating a space inside the external auditory meatus and the external space of the inner phone is formed on at least the peripheral wall part of the protector in close contact with the peripheral surface of the cavity of concha. COPYRIGHT: (C)2006,JPO&NCIPI
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