JPH04109385U - Non-contact ultrasonic sensor - Google Patents

Abstract

(57) [Summary] [Purpose] Do not perform detection operation when there is no intention to operate the switch. [Configuration] Memory circuit 7 that sequentially stores distances to objects;
8, and a comparison circuit 9 for comparing the distance between the storage circuits 7 and 8. A determination circuit 10 is provided which determines whether an object is approaching based on the output of the comparison circuit 9. An object detection distance measuring circuit 6 detects an object and measures the distance from the sensor A, and a storage circuit 7 and a storage circuit 8 sequentially store distance data for each wave transmission. Next, the comparison circuit 9 compares the current distance with the previously stored distance, and outputs a detection signal only when the judgment circuit 10 judges that the distance has approached.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention emits ultrasonic waves into the monitoring space, and the ultrasonic waves from the objects caused by the objects in the monitoring space are emitted. Non-contact technology that detects objects entering the monitored space by detecting reflected waves of sound waves This relates to ultrasonic sensors.

0002

[Conventional technology]

Conventional non-contact ultrasonic sensors transmit ultrasonic pulses intermittently within the monitoring space. The presence of an object is detected by transmitting waves to the object and continuously receiving reflected waves from the object. , the detection results are output. FIG. 3 shows a conventional example. The ultrasonic pulse type sensor is an ultrasonic vibrator that can be used for both transmission and reception. 2 is driven by the wave transmitting circuit 1 and transmits ultrasonic pulses intermittently, and the reflected waves from the object are It receives pulses, and this received signal is amplified by the receiving circuit 3 and further amplified. The signal is amplified and detected by the width detection circuit 4, and inputted to the object detection circuit 5, which outputs a detection signal. It is something.

0003

[Problem that the idea aims to solve]

In the conventional example above, the means for determining object detection is a non-contact ultrasonic sensor. Detection is possible even if the object passes within the monitoring area, as it only determines whether or not the object exists within the monitoring area. There was a problem that resulted in the output of a signal. The present invention has been proposed in view of the above points, and is based on the intention to operate the switch. We provide a non-contact ultrasonic sensor that does not perform detection operations when there is no It is intended to

0004

[Means to solve the problem]

This invention transmits ultrasonic pulses intermittently and continuously receives reflected waves from objects. A non-contact device that detects the distance to an object and outputs the detection result. type ultrasonic sensor measures the distance to the object multiple times and detects when the object approaches. This device is provided with a control means that outputs a detection signal only when it is determined that the detection signal has been detected.

[0005]

[Effect]

The control means measures the distance to the object multiple times and determines when the object approaches. The detection signal is output only when it is determined that the switch is activated. The detection operation is not performed when it is not expected.

[0006]

【Example】

Embodiments of the present invention will be described below with reference to the drawings. Figure 1 shows the ultrasonic pulse of this invention. 1 shows a block diagram of a sensor A based on the first-class method. As shown in the figure, the ultrasonic vibration The moving element 2 is driven by the wave transmitting circuit 1 and transmits ultrasonic pulses intermittently, and the reaction from the object is generated. Receives the emitted wave pulse.

[0007] This received signal is amplified by the receiving circuit 3, and further amplified and detected by the amplifying and detecting circuit 4. After that, the object detection distance measurement circuit 6 detects the object and detects the sensor based on the delay time from the wave transmission. The distance from A is measured, and the distance data is stored in memory circuit 7 and memory circuit 8 in sequence for each wave transmission. I will remember it. Next, the comparison circuit 9 compares the current distance and the previously memorized distance to determine that the distance has approached. A detection signal is output only when the judgment circuit 10 makes a judgment. In addition, memory times The circuits 7 and 8, the comparison circuit 9, the judgment circuit 10, etc. constitute a control means.

[0008] FIG. 2 is an explanatory diagram showing the operation of the present invention. Non-contact ultrasonic sensor A of the present invention outputs a detection signal only when it is determined that an object is approaching, as shown in Figure 2. It operates only when the hand is brought close to sensor A. Therefore, When there is no need to operate sensor A, for example, when passing in front of sensor A Otherwise, no detection signal will be output.

[0009]

[Effect of the idea]

As mentioned above, this invention transmits ultrasonic pulses intermittently and collects reflected waves from objects. By continuously receiving waves, it detects the distance to the object and outputs the detection result. The distance to the above object was measured multiple times using a non-contact ultrasonic sensor. A control means is provided that outputs a detection signal only when it is determined that the object has approached. Therefore, the control means measures the distance to the object multiple times and determines whether the object is in contact with the object. The detection signal is output only when it is determined that the object is close, and the switch is not operated. If you do not intend to do so, you can prevent the detection operation from occurring. , when there is no need for the sensor to operate, e.g. when passing in front of the sensor. However, it has the effect of providing a non-contact ultrasonic sensor that does not output a detection signal. It is something to do.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing the operation of an embodiment of the present invention.

FIG. 3 is a block diagram showing the configuration of a conventional example.

Claims (1)

[Scope of utility model registration request] Claim 1: A non-contact ultrasonic device that detects the distance to an object by intermittently transmitting ultrasonic pulses and continuously receiving reflected waves from the object, and outputs the detection results. A non-contact ultrasonic sensor, characterized in that the acoustic sensor is provided with a control means that measures the distance to the object multiple times and outputs a detection signal only when it is determined that the object has approached.