| 摘要 |
PROBLEM TO BE SOLVED: To form a vent hole which communicates with a space for storing a circuit board and a vent space at a housing rear surface part to expand the air volume and thereby prevent water from intruding into the storage space while buffering atmospheric pressure variation.SOLUTION: A housing includes: a rear surface part 6 attached to an installation surface 12a; a front surface part 5 located at the opposite side of the rear surface part 6; and a periphery part 7 located between the rear surface part 6 and the front surface part. The housing may store a circuit board 4 therein. A dent part 17 recessed from a surface and a cylindrical part 31 protruding from a bottom of the dent part 17 are formed on the rear surface part 6. A vent hole 14 which communicates with a storage space S for storing the circuit board 4 is formed in the cylindrical part 31, and a vent space K which communicates with the vent hole 14 is formed in the dent part 17. |
