| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna device where rainwater is prevented from being collected in a spot-faced recess 18b of a screw insertion hole 18a of a headed screw 20 for clamping and fixing a cover 18. SOLUTION: In the antenna apparatus, the proximal end part of an antenna element 16 is arranged on the upper face side of a base member 12 so as to be freely shaken around a shake shaft 14, and the base member 12 is covered from above by the freely shaking cover 18 through which the antenna element 16 projects, and the cover 18 is clamped and fixed to the base member 12 from above by a headed screw 20. The screw insertion hole 18a of the cover 18 is provided with the spot-faced recess 18b in which the head of the headed screw 20 in a clamping state sinks, and a vertical groove 18c is provided in a peripheral surface of the screw insertion hole 18b from the bottom of the spot-faced recess 18b, and a transverse groove 12d which has one end part facing the vertical groove 18c and has the other end opened and connected to the outside edge is formed in the base member 12. A waterway for leading rainwater intruding into the spot-faced recess 18b to the outside is constituted of the vertical groove 18c and the transverse groove 12d. COPYRIGHT: (C)2004,JPO
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