JPH01295194A - Ultrasonic detecting device - Google Patents

Abstract

PURPOSE:To detect an object body and specifies its passing direction with high accuracy by simple constitution by arranging an ultrasonic wave oscillator and >=2 ultrasonic wave receivers at constant intervals on the same wall surface of a passage where the body to be detected is allowed to pass. CONSTITUTION:The ultrasonic wave oscillator 15 and two receivers 16 and 17 which receive an ultrasonic wave 19 sent toward the opposite wall surface 18 of the passage 13 where a human body 12 to be detected is allowed to pass are installed on the same wall surface 14 of the passage 13. Consequently, the high-accuracy ultrasonic wave detecting device is obtained which is free from misdetection due to the hands of the human body, accessories, dust, the contamination of a reflecting wall surface 18, etc. Further, the ultrasonic wave 19 is detected by the two receivers 16 and 17 with a constant time difference to specify the passing direction of the body to be detected by the simple constitution.

Description

[Detailed Description of the Invention] (a) Industrial Application Field The present invention relates to an ultrasonic detection device installed at a station ticket gate or other passageway, and more specifically relates to an ultrasonic detection device installed at a station ticket gate or other passageway. The present invention relates to an ultrasonic detection device that detects ultrasonic waves, etc.

(B) Conventional technology Normally, this type of detection device has a transmission type or reflection type photoelectric detection sensor installed on a wall forming a passage, and the optical path perpendicular to the passage of this detection sensor is detected by the passage of a person, for example. By being blocked, it is detected that a person has passed through the passage.

However, with this photoelectric detection sensor, it takes time and effort to adjust the light intensity and the alignment of the optical axis, which greatly affect the detection sensitivity. The drive cable is required, which increases the number of installation steps, and in the case of a reflective type, since the shape of the object to be detected is not uniform, it is difficult to technically capture the reflected light, and the reflecting surface of the opposing wall is difficult to capture. False detection was likely to occur due to dust or dirt attached to the sensor. Furthermore, photoelectric detection sensors operate when a human hand or a personal item obstructs the optical path. A large number of detection sensors must be allocated, which leads to high costs.

(C) Problems to be Solved by the Invention The present invention is an ultrasonic detection device that accurately and economically detects an object passing through a passage using ultrasonic waves. It is an object.

(D) Means for Solving the Problems This invention provides a passage through which a detected object is allowed to pass, an ultrasonic transmitter installed on one wall of the passage to emit ultrasonic waves, and the ultrasonic transmitter. The ultrasound receiver installed on the same wall as the ultrasound transmitter reflects and receives the ultrasound waves emitted toward the other facing wall, and based on the disturbance of the ultrasound waves transmitted by the ultrasound transmitter, the passageway It consists of an ultrasonic detection device equipped with ultrasonic determination means for determining the presence or absence of an object to be detected inside.

In addition, one ultrasonic transmitter and at least two ultrasonic receivers capable of receiving the ultrasonic waves emitted from the transmitter are installed on one wall side of the passage corresponding to the ultrasonic reflection area at a certain interval.
Hi and configure.

(e) Appearance of the invention According to this invention, when an object to be detected, such as a human being, passes through a passageway, the ultrasonic waves emitted from the ultrasonic transmitter collide with the object to be detected and are disturbed. If the ultrasonic receiver does not detect this, it is determined that the object to be detected has passed.

Further, by detecting the ultrasonic waves at that time with a certain time difference between the two ultrasonic receivers, the passing direction of the detected object is specified.

(f) Effects of the invention Therefore, even if the object to be detected has an uneven shape, such as a human being, the ultrasonic waves will be disturbed, and the presence or absence of the object can be accurately detected just by detecting this disturbance. In addition, human hands or personal belongings are captured as one object, so there is no false detection of separate objects, and there is no false detection due to dust or dirt on the reflective wall surface, etc. High precision detection suitable for detecting passing objects. becomes possible.

Furthermore, even when installing on the wall of a passageway, the ultrasonic transmitter and ultrasonic receiver can be installed by roughly aligning them on the same wall, so there is no need for precise adjustment of the optical axis, etc. It can be installed easily.

Furthermore, even when detecting the passing direction, the passing direction of the object to be detected can be determined by installing two ultrasonic receivers in the direction of the passage and capturing the detection time difference corresponding to the speed of the passing object. In particular, since it can be constructed with a small number of parts, it is possible to reliably reduce the cost by 1 or more.

(g) Examples An embodiment of the present invention will be described in detail below based on the drawings.

The drawing shows an ultrasonic detection device, and in FIG.
One ultrasonic transmitter 15 and two ultrasonic receivers 16 and 17 are installed on one wall surface 14 of the cell.

The above-mentioned passage 13 - forms a parallel passage between the wall surface 14 and the opposing curved wall surface 18; - the wall surface 14 emits one ultrasonic wave at right angles to the curved wall surface 18; An ultrasonic transmitter 15 is installed, and a first ultrasonic receiver 16 and a second ultrasonic receiver 15 are installed on both sides of the same wall surface 14, equally spaced apart from each other.
An ultrasonic receiver 17 is installed to reflect and receive ultrasonic waves 19 transmitted from the ultrasonic transmitter 15.

As shown in FIG. 2, the ultrasonic transmitter 15 emits ultrasonic waves 19 in a constant cycle of output time t1 and non-output time t2, and some of the emitted ultrasonic waves wrap around in the lateral direction. The ultrasonic waveform A is detected by both ultrasonic receivers 16 and 17 on both sides, and one ultrasonic wave received after being reflected on the curved wall surface 18 is detected as a normal waveform. In this case, when the person 12 passes through the passage 13, one of the emitted ultrasonic waves collides with the person 12 and is disturbed.
The ultrasonic wave that collided with the object 2 and was reflected is detected as a detection waveform C.

Then, due to the disturbance in one ultrasonic wave, regular ultrasonic waves cannot be received, and this causes the first and second ultrasonic receivers 16
．． Passage of the person 12 is determined by the CPU 31, which will be described later, via the CPU 17. Also, the disturbance in one ultrasonic wave at this time is detected by two ultrasonic receivers 16.
By detecting the time difference for each person 17, the direction in which the person 12 passes is specified. Normally, it is determined that the ultrasonic wave has not passed by detecting the tri-force pulse signal d obtained every ultrasonic detection time t3. In the figure, 20 is an ultrasonic partition plate.

Figure 3 shows a control circuit block diagram of the ultrasonic detection device,
The CPU 31 controls each circuit device according to a program stored in the ROM 32, and stores the control data in the RAM 33 in an input/output manner.

The above-mentioned CPU 31 includes the first and second ultrasonic receivers 16.1.
7, it is determined whether the waveform is a normal waveform or the detected waveform C, and based on this determination result, it is determined whether or not the human being 12 has passed, and the direction in which the person 12 has passed. The processing operation of the ultrasonic detection device configured as above will be explained with reference to the flowchart shown in FIG.

Now, turn on the power to this device 11 and use the ultrasonic transmitter 15.
The ultrasonic waves 19 are emitted from the curved wall surface 18 in a constant cycle (first step 41 to second step 42), and the ultrasonic waves 19 transmitted in this constant cycle are reflected from the curved wall surface 18 and strike one wall surface 1.
When the CPU 31 detects that the ultrasonic waves 19 received by the first and second ultrasonic receivers 16 and 17 located on the 4th side or the emitted ultrasonic waves 19 correspond to the regular setting time, the When the CPU 31 determines that the ultrasonic wave 19 is in a passing state and determines that the transmitted ultrasonic wave 19 is interrupted midway and does not correspond to the set time and is not a regular ultrasonic wave, the determination result is Based on this, it is determined that the human 12 is passing, and further, the direction of the passage is determined based on the difference in the signals received by the ultrasonic receivers 16 and 17 (sixth step 46).

As mentioned above, even if the shape of a person, etc. is not uniform, the ultrasonic waves are definitely disturbed, and just by detecting this disturbance, it is possible to accurately detect the presence or absence of a person. Since portable items are captured as one unit, it is possible to perform highly accurate detection suitable for detecting passing objects, without erroneously detecting objects as separate items, and also preventing erroneously detecting objects due to dust or dirt on reflective walls.

In addition, even when installing on the wall of a passageway, the ultrasonic transmitter and ultrasonic receiver can be installed on the same wall with approximate alignment, and there is no need for precise adjustment of the optical axis, etc., making it easy to install. It can be installed in

Furthermore, even when detecting the passing direction, the passing direction of the object to be detected can be determined by installing two ultrasonic receivers in the direction of the passage and capturing the detection time difference corresponding to the speed of the passing object. In particular, since it can be configured with one transmitter and two receivers, the number of parts can be reduced, and costs can certainly be reduced.

In the correspondence between this invention and the structure of the two series of embodiments, the detected object of this invention corresponds to the human being 12 of the embodiment,
Similarly, the ultrasonic receiver corresponds to the first ultrasonic receiver 16 and the second ultrasonic receiver 17, and the ultrasonic determination means corresponds to the CPU 31. The present invention is not limited to the configuration of the embodiment.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, FIG. 1 is an explanatory diagram of an ultrasonic detection device, FIG. 2 is an explanatory diagram of the output of the ultrasonic detection device, and FIG. 3 is a control circuit block diagram of the ultrasonic detection device. FIG. 4 is a flow chart 1 of the ultrasonic detection device. 11... Ultrasonic receiver M 1.2... Human 13.
...Passway 14...-Wall surface 15...Ultrasonic transmitter 16.17...Ultrasonic receiver 18...Curved wall surface 19...Ultrasonic wave 31...CPU

Claims (2)

[Claims] (1) A path that allows the object to be detected to pass through; It is installed on one wall of the passage and emits ultrasonic waves. An ultrasonic transmitter that believes in From the ultrasonic transmitter to the other opposing wall The transmitted ultrasonic waves are reflected and received, and the ultrasonic waves are Ultrasonic receiver installed on the same wall as the transmitter and, Based on disturbances in the ultrasonic waves emitted by the ultrasonic transmitter. Based on this, it is determined whether there is a detected object in the passage. Equipped with ultrasonic determination means to Ultrasonic detection device. (2) A claim comprising one ultrasonic transmitter and at least two ultrasonic receivers arranged at a certain interval on one wall of a passageway corresponding to the ultrasonic reflection area emitted by the transmitter. Item 1. Ultrasonic detection device according to item 1.