| 摘要 |
PROBLEM TO BE SOLVED: To provide a microphone device whose maintenance work is easy as to the microphone device in which moisture resistance is requested like that for noise measurement, which is used outdoors. SOLUTION: The microphone device stored in a container 1 is provided with a dehumidification element 7 which has porous electrodes on respective faces of a solid electrolyte film having hydrogen ion conductivity and is arranged between the inner part and the outer part of the container 1, a DC power source 17 supplying a DC current to the dehumidification element 7, a humidity detection means 15 detecting humidity in the container 1, a reversible moisture absorption member 18 which is arranged in the container 1 and absorbs and discharges moisture, and a dehumidification control means 16 applying a DC voltage to the the dehumidification element 7 from the DC power source 17 when humidity in the container 1 detected by the humidity detection means 15 reaches a humidity setting value, and removing moisture in the container 1 and the reversible moisture absorption member 18. When humidity in the container detected by the humidity detection means 15 reaches the humidity setting value, the dehumidification control means 16 applies a DC voltage to the dehumidification element 7 from the DC power source. Consequently, maintenance work becomes easy and the inner part of the container can be kept in prescribed humidity since moisture in the container and a reversible moisture absorption member is removed. COPYRIGHT: (C)2005,JPO&NCIPI
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