JPS638686U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the ultrasonic detection device according to the present invention, Fig. 2 is a diagram showing an example of the ultrasonic detection device according to the present invention used for traffic signal control, and Fig. 3 is a diagram showing another state of use. 4 is a block diagram of an ultrasonic detection device suitable for the usage condition shown in FIG. 3, FIGS. 5 a to 5 e are time charts, and FIG. It is a figure showing the appearance of a detection device. DESCRIPTION OF SYMBOLS 1...Ultrasonic transducer, 2...Amplifier, 3...Mixer, 4...Filter circuit, 5...Amplifier, 6...Verification circuit, 7...Amplifier, 8...Verification circuit, 9...Timer circuit,
10...OR circuit, 11...output circuit, 12...timing creation circuit.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In an ultrasonic detection device that emits ultrasonic pulses into the air and detects the detected object by receiving reflected waves from the detected object, the reflection caused by the movement of the detected object Equipped with a Doppler detection circuit that detects a frequency shift due to the Doppler effect of waves, and a reflected pulse detection circuit that detects when the reception level of the reflected wave from the object to be detected is equal to or higher than a preset threshold, An ultrasonic detection device characterized in that an OR output of the Doppler detection circuit and the reflected pulse detection circuit is used as a detection output. (2) The ultrasonic detection device according to claim 1, wherein the Doppler detection circuit includes a verification circuit that detects that the frequency shift output continues for a certain period of time. (3) The reflected pulse detection circuit includes a timer circuit that detects when an output equal to or higher than the threshold value continues for a certain period of time. Ultrasonic detector as described. (4) having a first gate circuit that defines a distance at which the Doppler detection circuit can detect the object to be detected; and a second gate circuit that defines a distance at which the reflected pulse detection circuit can detect the object; The ultrasonic detection device according to claim 1, 2, or 3, wherein the detection distances can be set independently by the first and second gate circuits. (5) Utility model registration claims 1, 2, 3, or 4 which include a push-button switch and immediately output a sensing output when the push-button switch is pressed. The ultrasonic detection device described in . (6) Claims 1, 2, 3, 4, or 5 of a utility model registration characterized in that one ultrasonic transducer and horn are shared as an ultrasonic transducer. The ultrasonic detection device described in .