| 摘要 |
<p>PURPOSE:To obtain an antenna device which can be miniaturized and whose power comsumption can be reduced by providing a first direction control means which is fixed to a shaft and which receives a wind pressure while a vehicle is running in such a way that the radio-wave receiving direction of an antenna is always directed to the advance direction of the vehicle. CONSTITUTION:Two wind-receiving plates 27 are composed respectively of a trapezoidal thin plate, they are fixed to side faces of a second frame 28 with screws 28 in such a way that their short sides as parallel sides of trapezoids are parallel to each other, and they are shaped in such a way that they are separated from each other as they advance to their sides from their fixed parts. A third conical frame 29 is fixed to the bottom face of the frame 26, a shaft 30 is fixed to the bottom face of the frame 29, a signal wire 25 is passed through the inside, and the shaft is attached to a bearing stand 35 so as to be freely rotatable. An antenna part 20 is constituted in such a way that it is turned around the shaft 30 by receiving a wind while a vehicle 21 is running and that a reflecting plate 24 is always directed to the advance direction of the vehicle 21.</p> |
