| 摘要 |
PURPOSE: A microphone unit is provided to implement an excellent differential property while having a simple structure with a decreased thickness thereof. CONSTITUTION: One vibration diaphragm(21) senses a sound. One housing(24) has an internal space. The internal space accepts the vibration plate. One or more bridge member(3) is projected from the housing. One base(4) is connected to one or more bridge member. The vibration diaphragm divides the internal space into a first internal space(1a) and a second internal space(1b). The housing has a first penetration hole(2a) and a second penetration hole(2b). One gap interlinks the second internal space and an outer space. The gap is formed between the housing and base. The gap is formed between one part of the bridge member and the base.
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