| 摘要 |
<p>PURPOSE:To permit to detect obstacles in first and second regions in a time sharing manner by a device wherein a supersonic wave receiver is provided between first and second supersonic wave transmitters and the former supersonic wave receiver is used in a time sharing manner with respect to the first and second supersonic wave transmitters. CONSTITUTION:A supersonic wave receiver 5a or 5b is provided between first and second supersonic wave transmitters 4a and 4b. A switching control circuit 2 adapted to switch and control operations of the first and second wave transmitters 4a, 4b in a time sharing manner is also provided. In accordance with the time sharing switching control of the circuit 2, an obstacle in a first region is detected by a combination of the first wave transmitter 4a and the wave receiver 5a or 5b, while an obstacle in a second region is detected by a combination of the second wave transmitter 4b and the wave receiver 5a or 5b.</p> |
