JPH02254393A - Sensor for automatic door - Google Patents

Abstract

PURPOSE:To enable the opening or closing of an automatic door with a limited detection time delay with a simultaneous wiring by providing a compound sensor as a combination of a pulse type ultrasonic sensor for detection of existence and an infrared sensor for detection of movement on both sides of a door. CONSTITUTION:As a human body M approaches a door 6 to enter a detection area 7a, a detection signal is outputted from a pulse type ultrasonic sensor 1a and further, when the human body M traverses a detection area 7a', a detection signal is outputted from an infrared sensor 1a'. A judging section 2 outputs a human detection signal by these signals to open a door 6 through an output control section 3 and a door driver 4. Then, when the human body M stops in the areas 7a and 7a', no signal is outputted from a sensor 1a' while a signal is outputted from the sensor 1a. But after the human body M is detected once, the judging section 2 is so changed to detect and judge the human body M only by a signal from the sensor 1a and the door 6 will not be closed. Thereafter, when the human body M leaves the area 7a, the door 6 is closed. This eliminates malfunctioning without requiring a synchronous wiring of the sensors 1a and 1b and thus the door will not be closed even when the man stops in the area.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automatic door sensor that opens and closes the door by detecting a human body or the like using sensors installed on both sides of the door.

[Conventional technology]

Traditionally, it has been used as an automatic door sensor to measure the presence of an object to be detected, such as a human body, and the distance between the detector and the object, based on the presence or absence of reflected waves (received signals) of ultrasonic pulses and the time delay from transmission. Pulse-type ultrasonic sensors are often used.

FIG. 3 shows an example of a conventional pulse type ultrasonic sensor for automatic doors. The pulse type ultrasonic sensors la and lb installed on both sides of the door each have a detection area 7.
a and 7b.

However, when multiple presence-detection type pulse-type ultrasonic sensors are installed in close proximity to each other, malfunctions occur due to interference between the ultrasonic waves emitted by each sensor, so separate synchronization wiring is required. .

Therefore, the applicant proposed an ultrasonic sensor that does not require synchronous wiring and will not interfere with each other and malfunction even without synchronous wiring (Japanese Patent Application No. 63117512).

[Problem to be solved by the invention]

However, since the above-mentioned ultrasonic sensors are checked multiple times to prevent malfunction, there is a time delay from when the object to be sensed enters the detection area until the detection signal is output, which is not possible with conventional synchronous wiring. The problem was that it was larger than the conventional pulse-type ultrasonic sensor.

Furthermore, passive infrared sensors have also been widely used as sensors for automatic doors. However, infrared sensors convert the fact that a detected object such as a human body crosses the sensor's detection area into a change in electrical signals, and detect this change by capturing the change. There was a problem in that the door 6 would close if it stopped midway.

The present invention has been made in view of the above points, and an object of the present invention is to provide an automatic door sensor that does not require synchronous wiring and has a small detection time delay.

[Means to solve the problem]

The present invention provides an automatic door sensor in which sensors are installed on both sides of the door and the door is opened and closed based on detection signals from the sensors, in which each of the sensors includes a pulse type ultrasonic sensor for presence detection and a The present invention is characterized by using a composite sensor that combines an infrared sensor for detecting movement, and further comprising a determination unit that determines the presence of a human body using detection signals from the pulsed ultrasonic sensor and the infrared sensor. be.

[Effect]

In the present invention, when a human body approaches the door, detection signals from the pulsed ultrasonic sensor and the infrared sensor are input to the determination section, and the determination section determines whether the human body It determines that there is a human body, sends out a human body detection signal, and opens the door. After this, the determination standard is changed so that the determination unit determines the presence of a human body only based on the detection signal of the pulse type ultrasonic sensor. Therefore,
Even if a human body stops within the detection area, the pulsed ultrasonic sensor sends out a detection signal and the door remains open. After that, when the human body leaves the detection area of the pulsed ultrasonic sensor, the door closes.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is a diagram showing the usage situation of the same.

1a is a presence detection type pulsed ultrasonic sensor, and door 6
Detection area 7a is installed on one side of the upper part of the
is formed. la' is a movement detection type infrared sensor installed at the same position as the pulse type ultrasonic sensor 1a,
A detection area 7a+ is formed by a plurality of directional beams. The detection areas 7a and 7a' are formed to cover approximately the same area. A pulse type ultrasonic sensor 1b and an infrared sensor lb' are similarly installed on the opposite side of the door 6, but since they have the same functions as the pulse type ultrasonic sensor 1a and the infrared sensor 1a°, from now on,
Description regarding the pulse type ultrasonic sensor 1b and the infrared sensor lb' will be omitted.

2 is a determination unit that determines the presence of a human body M and outputs a human body detection signal, and output signals from a pulse type ultrasonic sensor 1a and an infrared sensor 1a are inputted thereto.Determination unit 2
Then, when the human body M enters the detection areas 7a and 7a' and detection signals are output from both the pulse type ultrasonic sensor 1a and the infrared sensor 1a', it is determined that the human body M is present, and a human body detection signal is sent out. However, after that, the judgment criteria are changed so that the human body detection signal is sent out using only the detection signal from the pulse type ultrasonic sensor 1a. and,
The transmission of the human body detection signal is stopped only when the detection signal from the pulse type ultrasonic sensor 1a is no longer output. Therefore, once the human body M enters the detection area 7a, -t al, even if the human body stops within the detection area 7a, 7a", the detection signal from the pulse type ultrasonic sensor 1a is output, so the judgment can be made. Section 2 continues to output human body detection signals.

Reference numeral 3 denotes an output control section that sends control signals to a door drive device and an output drive section, which will be described later, based on the human body detection signal from the determination section 2. Reference numeral 4 denotes a door driving device, which opens and closes the door 6 in response to a control signal from the output control section 3. Reference numeral 5 denotes an output drive unit for outputting the presence or absence of detection of the human body M to the outside, and includes a relay, an LED, a communication line, and the like.

Next, the operation of this embodiment will be explained.

Assuming that the human body M approaches the door 6 as indicated by the arrow, it first enters the detection area 7a of the pulse type ultrasonic sensor 1a, and a detection signal is output from the pulse type ultrasonic sensor 1a. Furthermore, since it crosses the detection area 7a', a detection signal is also output from the infrared sensor 7a'. Therefore, the determination unit 2 determines that the human body M is present based on these detection signals, and outputs a human body detection signal. This human body detection signal causes the door 6 to be opened via the output control section 3 and the door drive device 4. Here, if the human body M stops within the detection areas 7a and 7al, the infrared sensor 1
No detection signal is output from the pulse type ultrasonic sensor 1a, and a detection signal is output only from the pulse type ultrasonic sensor 1a.However, the determination unit 2
Now, once the human body M has been detected, the criterion for determining the presence or absence of a human body has been changed to use only the detection signal from the pulsed ultrasonic sensor la to determine whether the human body is detected.
In this case as well, a human body detection signal is output. Therefore, the door 6 will not close.

After this, when the human body M leaves the detection area 7a, the determination unit 2 does not receive the detection signal from the pulse type ultrasonic sensor 1a, so the human body detection signal is no longer output.
Door 6 is closed.

Here, in order to prevent the door 6 from closing when the human body M is standing in the position of the door 6 with the door 6 open, another pulse type super A sonic sensor (not shown) may be installed, the detection area facing directly below, and the area below the door 6 may be monitored using this ultrasonic sensor.

According to this embodiment, when detecting the human body M and opening the door 6, the pulse type ultrasonic sensor la and the infrared sensor 1a are used.
The door 6 is opened only when both detection signals from the pulse type ultrasonic sensor 1a are output, and after the door 6 is opened, the door 6 is kept open only by the detection signal from the pulse type ultrasonic sensor 1a. Therefore, even if the pulse type ultrasonic sensors 1a and 1b are not wired in a synchronous manner, one pulse type ultrasonic sensor 1a may malfunction due to the transmitted signal from the other pulse type ultrasonic sensor 1b. There is no need to carry out continuous detection multiple times, so the detection time does not take long. Also, like when using an infrared sensor alone,
The door will not close when a human body stops within the detection area.

〔Effect of the invention〕

As described above, according to the present invention, in an automatic door sensor that opens and closes a door based on a detection signal from a sensor provided on the door, each of the sensors includes a pulse type ultrasonic sensor for presence detection. In addition to using a composite sensor that combines an infrared sensor for movement detection and a determination section that determines the presence of a human body using detection signals from the pulsed ultrasonic sensor and the infrared sensor, synchronous wiring is not required. We were able to provide a sensor for automatic doors that is large and has a small detection time delay. .

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a usage diagram of the same as the above, and FIG. 3 is a usage diagram of a conventional example. la, 1b - Pulse type ultrasonic sensor la'lb" - Infrared sensor 2 - Judgment unit 3 - Output control unit 4 - Door drive device 5 - Output drive unit 6 - Doors 7a, 7a" 7b , 7b'-Detection Area Patent Applicant Matsushita Electric Works Co., Ltd. Agent Patent Attorney Toshimaru Takemoto (and 2 others) Figure 2 Figure 3

Claims (1)

[Claims] (1) In an automatic door sensor in which sensors are installed on both sides of the door and the door is opened and closed based on detection signals from the sensors, each of the sensors is equipped with a pulsed ultrasonic sensor for presence detection and a movement sensor. For an automatic door, using a composite sensor that combines an infrared sensor for detection, and further comprising a determination unit that determines the presence of a human body using detection signals from the pulsed ultrasonic sensor and the infrared sensor. sensor.