| 摘要 |
PURPOSE:To make it possible to obtain a max. response speed corresponding to a detected distance, by setting the feed-out timing of a pulse like ultrasonic wave immediately after the receiving/judge processing of the previously fed-out ultrasonic wave has been finished or after a definite time was elapsed. CONSTITUTION:The carrier signal from a carrier signal oscillation circuit 1 is imparted to a modulation circuit 3 and modulated by the pulse from a pulse generating circuit 2 to be transmitted toward matter 5 to be detected from a transmitter 4. The reflected wave from the matter 5 to be detected is detected by a receiver 6 and subjected to receiving processing by a signal processing circuit 7 to be applied to a judge display part 8. A transmitting cycle control circuit 9 outputs a transmission order to the pulse generating circuit 2 at the point of time when processing data is sent out from the signal processing circuit 7 or after a definite time has elapsed after said point of time.
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