| 摘要 |
PURPOSE:To prevent a deterioration in a performance, by providing an arm fixing an ultrasonic wave oscillator to the upper part of a reflecting plate and providing air gaps discharging water flowing to the reflecting plate from the upper part externally between the arm and the reflecting plate, so as to prevent the water from striking the oscillator at a car washing. CONSTITUTION:A bracket 5 is fitted to the inside of a bumper 6 of a car, and a rubber-made arm 4 fitted with the ultrasonic wave oscillator 3 and a parabola reflecting mirror 1 giving a prescribed directivity to the ultrasonic wave are fixed to the bracket 5. Further, an ultrasonic wave guide 2 is provided between the opening of the bumper 6 and that of the reflecting mirror 1. Moreover, the air gaps 7a, 7b of a parabola shape are provided with a prescribed interval among both left/right ends, lower part of the reflecting mirror 1 and the guide 2. Then, the air gap 8 curved and separated into two is provided between an upper curved surface 1a of the reflecting mirror 1 and a center curved surface 4b of the arm 4. Thus, the water flowing into the reflecting mirror 1 is discharged from the upper part externally, allowing to prevent the striking of the water to the oscillator 3 and to prevent the deterioration in the performance. |
