| 摘要 |
PURPOSE:To remove the rain drip or snow adhered onto the surface of window glass easily and reliably without employing a blade by exciting the traveling wave travelable from one to the other side of the circumference of window glass at the surface side of the window glass of vehicle through a supersonic vibrator. CONSTITUTION:Supersonic vibrators 3, 4 are fixed onto the inner face of the front glass 2 of vehicle 1. Lunjevin type longitudinal vibrators 31, 41 are contacted, for example, through horn type transformers 32, 42 against the glass 2 while an oscillation circuit 33 and a receiver circuit 43 are connected respectively to the longitudinal vibrators 31, 41. Upon driving of said vibrator 31, the supersonic vibration will cause the surface travel wave on the outer face 2a of the glass 2 and received by said vibrator 41. Since the mass point at the outer face 2a side of glass 2 will vibrate to the rear side against the traveling direction of wave, the rain drip or snow R will drop through the frictional force between the glass face 2a.
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