| 摘要 |
PROBLEM TO BE SOLVED: To provide a water drain structure for an interphone slave set capable of securing the received speech volume of voice of a visitor, etc., by preventing water drops from being accumulated in the microphone hole of an interphone slave set. SOLUTION: The interphone slave set case is provided with a camera 16 and a microphone 11, the camera is covered with a camera cover 12, and the microphone hole 13 connected spatially to the microphone is bored at the camera cover. In the case, a drain groove 15 for making rain water entering the case through the microphone hole flow downward is provided at the lower part of the microphone hole, and a rib 14 for preventing drops from being accumulated in the microphone hole due to surface tension on rain water from the side wall 19 of the microphone hole.
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