| 摘要 |
PROBLEM TO BE SOLVED: To use one microphone for both of a normal air conduction type microphone and a bone conduction type one used by abutting on a human body. SOLUTION: The microphone includes: an acoustic electric transducer 20; a movable air chamber section 30 having an air chamber 31 inside and an output hole 33a at the rear side; and a microphone casing 10 having first and second storage sections 11, 13 communicating each other via a vent 12. The movable air chamber section 30 is supported via an elastic support 34 in the first storage section 11. The acoustic electric transducer 20 is stored in the second storage section 13, while an acoustic terminal 21a opposes the vent 12. The movable air chamber section 30 is supported at a position apart from a bottom section 11b of the first storage section 11, while not abutting on a human body. The movable air chamber section is close to the bottom section 11b of the first storage section 11 by the contact pressure, while abutting on a human body. The air chamber 31 is acoustically connected to the acoustic terminal 21a of the acoustic electric transducer 20 via the output hole 33a and the vent 12. COPYRIGHT: (C)2009,JPO&INPIT
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