| 摘要 |
PROBLEM TO BE SOLVED: To prevent looseness of an antenna from being generated, to ensure an electric contact between a substrate and an antenna, and do away with cleaning of the antenna during production and use by making it to execute self-cleaning. SOLUTION: A cylindrical terminal is set at a root part (a tip part of a side to be attached to a case) of an antenna, and a flat plate is also set between the cylindrical terminal and an antenna base part. The plate has a curved surface in the front and back surfaces, and a diameter of the curved surface is arranged so as to be larger than the dimension between a right-side surface and a left-side surface. A hole conforming to the shape of the flat plate and a groove into which the flat plate is pinched when the antenna is inserted and rotated by 90 degrees are set in the case. A cap which is equipped with a detent rib for the flat plate and mounted to the case after the antenna is mounted is set. A metal fitting (antenna terminal) which is mounted to the substrate inside the case and equipped with a hole having a plurality of segments to which the cylindrical terminal of the antenna is fitted, is formed.
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