| 摘要 |
<p>This microphone unit (10) includes a vibrating portion (14) converting a sound to an electric signal, a substrate (13) having a first surface (13a) where the vibrating portion is set and a second surface (13b) opposite to the first surface and including a hollow portion (134) transmitting a sound therein, and a coating layer (17) formed on an inner surface of the hollow portion of the substrate. The substrate further includes a first substrate sound hole portion (132) provided on the first surface for causing the hollow portion and the vibrating portion to communicate with each other, a second substrate sound hole portion (131) provided on the first surface for causing the hollow portion and the exterior to communicate with each other, and a coating liquid draining hole portion (133) provided on the second surface for causing the hollow portion and the exterior to communicate with each other.</p> |
