| 摘要 |
PROBLEM TO BE SOLVED: To provide a behind-the-ear hearing aid which causes no supply voltage reduction and no deterioration in a function as a hearing aid even when high sound pressure is output from an earphone. SOLUTION: The behind-the-ear hearing aid is provided with a first battery 21 for driving the earphone and a second battery 12 for driving an electric circuit, wherein the first battery 21 is arranged together with the earphone 30 in an earhole-shaped casing 4 to be attached to an external ear canal and the second battery 12 is arranged together with a microphone 10 and a DSP 11 in a hearing aid main body 2. The second battery 12 is a rechargeable battery and even when voltage of one of the first battery 21 and the second battery 12 reduces, the other battery supplies power for the one battery. COPYRIGHT: (C)2008,JPO&INPIT
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