JPH03172484A - Obstruction detecting device for automatic door - Google Patents

Abstract

PURPOSE:To detect the existence of an obstacle positively by providing doors with an obstruction detecting device mounted with a sensor for transmitting supersonic waves and receiving their reflected waves and a control part for opening/closing the doors at time intervals before receiving the reflected waves. CONSTITUTION:An obstruction detecting device is formed of a sensor 5 provided with a transmitting part for transmitting supersonic waves and a receiving part for receiving their reflected waves, and a control part for controlling the opening/closing of the doors at time intervals before receiving the reflected waves of the supersonic waves. Automatic doors 1, 2 are formed to slide in the direction of a pair of door studs 3, 4. The sensor 5 is fitted at the approximate center of the transom 6 of the doors 1, 2, and the supersonic waves are transmitted from the transmitting part in such a way as to bit the automatic doors 1, 2. The control part then performs the closure of the doors 1, 2 at time intervals before receiving the reflected waves. The detection of an obstacle can be thereby performed positively by one senor 5.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to an obstacle detection device that detects the presence or absence of an obstacle in the opening/closing path of an automatic door. The present invention relates to an obstacle detection device for an automatic door, which is capable of detecting whether there is an obstacle in the opening/closing path using a single detection device.

[Conventional technology]

Automatic doors open the door when a person stands near the door, and a sensor installed on the floor detects a change in weight.
A sensor installed at the top of the door detects changes in the amount of near- and far-infrared light caused by the movement of people, and opens the door.
The door is opened by a person blocking the optical path of an optical sensor installed near the door. These automatic doors open even when a person passes through the sensor part, so there are many unnecessary openings and closings.Therefore, the door is equipped with a switch consisting of a touch sensor, etc., and the switch is opened by lightly pressing it with the hand. Automatic doors are also widely used.

The automatic door opened as described above closes after detecting that a passerby has definitely passed through the door, that is, after confirming that an obstacle such as a person or object has passed. The presence or absence of an obstacle can be detected by the sensor described above, but since the automatic door itself is also considered an obstacle, the sensor must avoid the detection area so as not to detect the automatic door. . Therefore, the line along which the automatic door opens and closes becomes a non-detection zone, and in addition to these sensors, an obstacle detection device is provided that uses infrared rays or ultrasonic waves to detect the presence or absence of an obstacle.

In the case of an infrared obstacle detection device, an infrared emitter is installed on one side of a pair of mullions, which are pillars located on the left and right sides of an automatic door, so as to emit infrared light horizontally. A light receiving section for receiving infrared rays is provided in the other mullion. On the other hand, in the case of an obstacle detection device using ultrasonic waves, ultrasonic waves are emitted in a certain area, and when a person or object enters the area, the sensor receives the reflected wave from the person, and the reflected wave Since the presence or absence of a person, etc. is determined based on the state of the door, it is recommended to install an ultrasonic transmitter/receiver under the beam at the negative side of the automatic door, i.e., under the eye, and mount it so that it emits ultrasonic waves downward. .

[Problem to be solved by the invention]

In the case of infrared rays, the detection area is a straight line, so in order to reliably detect adults, children, small animals such as dogs and cats, and low obstacles, it is necessary to install multiple light emitting units at different heights in a mullion. A light receiving section must be provided. Furthermore, in order to detect obstacles near the front and rear surfaces of an automatic door, it is necessary to install a light emitting part and a light receiving part on both sides of the door, which requires multiple sets of infrared detection devices, which increases the cost. turn into. Furthermore, it is necessary to provide mounting holes for installing the light projecting section and the light receiving section in the left and right mullions, which makes construction difficult.

On the other hand, in the case of ultrasonic waves, a wide detection area can be provided by simply installing a unit consisting of a transmitting section and a receiving section under the eye. Therefore, a single transmitting/receiving unit can reliably detect the presence or absence of an obstacle 4 in the vicinity of an automatic door, but automatic doors usually have a sticker indicating that they are automatic, or a name plate with the building name or company name. are attached, and even the slightest protrusion of these stickers or nameplates will reflect the ultrasonic waves.
If a sticker or the like of an automatic door that is about to close is located in the detection area, the detection device may determine that there is an obstacle and open the door by receiving ultrasonic waves reflected from the protrusion of the sticker or the like. Therefore, in such an ultrasonic obstacle detection device, the detection area is set at a position away from the automatic door to avoid the double problem. Therefore, not only is it impossible to detect obstacles when approaching the automatic door, but there is also the drawback that they must be installed on the front and rear surfaces of the automatic door.

Therefore, the purpose of this invention is to take full advantage of the advantage that a single ultrasonic detection device can cover a wide area.
An object of the present invention is to provide an obstacle detection device for an automatic door that can reliably detect the presence or absence of obstacles on the front and rear surfaces of an automatic door using a base detection device, and can prevent malfunctions caused by stickers or the like.

[Means to solve the problem]

The present invention provides a sensor that is located near an automatic door and includes a transmitter that emits ultrasonic waves downward, a receiver that receives reflected ultrasonic waves, and a receiver that receives reflected ultrasonic waves from a floor surface. Obstacle detection for an automatic door, which has a control unit that measures the time it takes to receive a wave and controls the automatic door not to close when the receiving unit receives a reflected wave at a time interval shorter than a set value. In the device, the sensor is installed below the door above the automatic door, and the transmitting part emits ultrasonic waves so that part of it hits the automatic door. When the door is received, the automatic door is automatically closed.

[For production]

When a sticker, etc. is pasted on an automatic door, the position of the sticker, etc. is fixed, and the time it takes for the receiver to receive the reflected ultrasonic wave reflected from the sticker, etc. can be predicted by ``P''. When a reflected wave is received at the specified time interval, the controller is set in advance to automatically close the door as it is a reflection from a fixed obstacle.This setting is based on the distance from the sensor to the sticker, etc. By inputting the distance and width, the control section performs calculations such as multiplying the distance by the speed of sound, and calculates the time.It can be easily set.However, the area where stickers etc. are attached will be a non-detection zone. Even if a person's head is located in the non-detection zone, their shoulders, feet, etc. will also be detected, so if a person stands, there is no risk of the automatic door closing.

〔Example〕

An embodiment of the present invention shown in the drawings will be described below. Figure 1 shows the automatic door enclosure.

In this embodiment, an example is taken of an automatic door in which two doors 1.2 slide in the directions of a pair of mullions 3 and 4 located at both ends thereof. The sensor 5 is attached to the bottom surface of the blind part 6 located in a part of the doors 1 and 2, and transmits ultrasonic waves towards the child and detects the reflected waves reflected from the floor and obstacles. receive. Stickers 7 are pasted on the doors 1 and 2 to indicate the opening direction and the fact that they are automatic doors.

As shown in FIG. 3, the sensor 5 includes an ultrasonic transmitter 11.
and a receiving section 12 that receives reflected waves. The receiving section 11 is connected to a control section 15 via a transmission drive circuit 13 and a transmission control circuit 14. Transmission control circuit 14
is a circuit for setting the transmission frequency of ultrasonic waves, and when a transmission start signal from the control unit 15 is input, a signal of a preset frequency is output to the transmission drive circuit 13, and the transmission drive circuit 13 Upon receiving this, a signal is output to the transmitting section 11. The receiving section 12 includes a receiving amplifier 16 and an input capo-1-.
], 7 to the control unit 15. Control part 1
A timer 18 is connected to 5, and this timer 18 controls switching between transmission and reception operations. The control unit 15 also includes a ROM that stores an operation program for the control unit 15.
19. RA that stores setting conditions and information obtained by the control unit 15
An oscillator 22 that outputs a frequency signal that is the basis for M21° measurement is also connected. The control unit 15 has a setting means 23, for example, a numeric keypad, for inputting the distance from the sensor 5 to the sticker 7 affixed to the door.
have. The automatic door closing instruction signal from the control unit 15 is sent to the output control circuit 25 via the output port 24.
This output control circuit 25 applies an output for closing to an engine circuit of an automatic door (not shown).

Next, the operation of this device will be explained. First, the frequency of the ultrasonic signal to be transmitted from the transmitter 1 of the sensor 5 is set by the transmitter control circuit 14. On the other hand, the distance from the sensor 5 to the floor, the distance from the J-@ edge of the sticker 7 attached to the doors 1 and 2 to the sensor 5, the distance to the sticker 7, and the -1-downward width of the sticker 7 are numerical values. manually from the setting means 23. The numerical information from the setting means 23 is converted by the controller 15 into the time it takes for the ultrasonic waves reflected by the floor or the sticker 7 to be received by the receiver 12, taking into account the numerical value of the transmission frequency, and the time information is stored in the RAM 21. be done. For example, if the transmission frequency is 40KI (z), the distance from the sensor 5 to the floor is 22001m1, and the distance from the sensor 5 to the upper edge of the sticker 7 is 1000+nm, the ultrasonic waves transmitted from the transmitter 11 are reflected by the floor and are received. The time it takes for the unit 12 to receive the signal is 0.01235 seconds, and the sticker 7
The time it takes for it to be reflected by the receiver 12 and received by the receiver 12 is 0.
The time can be set in advance to be 00706 seconds. Such calculations may be performed by the control unit 15. With this setting, a detection band 2 is placed over the vertical width of the sticker 7.
6.27 is formed.

Therefore, if the transmitter 11 emits ultrasonic waves when the doors 1 and 2 are closed, if a person is standing near the opening/closing path, the reflected waves will be reflected by the person's head, shoulders, or feet. is received by the receiving section, and the received signal is amplified by the amplifier 16 and then applied to the control section 15 via the input port 17.

The control unit 15 uses the oscillator 22 to control the time it takes for the emitted ultrasonic waves to hit a person's head and shoulders and be reflected, and for the reflected waves to be received.
It is calculated based on the sound velocity from
Since there is an obstacle during the closing of the doors 1 and 2, the closing instruction signal for the doors 1 and 2 is not outputted to the output control circuit 25.

On the other hand, when the person completely disappears from the opening/closing path of the doors 1 and 2, the receiving section 12 of the sensor 5 receives only the reflected waves from the floor, and the control section 15 determines that there are no obstacles in the opening/closing path. Then, a closing instruction signal for doors 1 and 2 is output to the output control circuit 25. When the doors 1 and 2 are closed, the sticker 7 is located in the detection area of the sensor 5, and the reflected wave from the sticker 7 is received by the receiver 12. However, in the control unit 15, as described above, the position information of the sticker 7 is set as a non-detection zone, so that the areas 1 and 2 that are closing due to the waves reflected by the sticker 7 do not open again.

Even if a small person or child whose head is in the position of the sticker 7 stops in the path of opening and closing the doors 1 and 2, the ultrasonic waves from the transmitter 11 will not hit the person's shoulders or legs. , the presence of a person can be reliably detected by receiving the reflected waves from them.

Furthermore, as in the double embodiment, by providing the setting means 23 consisting of a numeric keypad or the like, if a name plate, advertisement, etc. other than the sticker 7 is pasted on the 1st and 2nd corners,
The non-detection zone can be easily set by simply inputting the pasting positions.

In addition, the input method is to use a double keypad switch, etc., and by adding a learning function by opening and closing the door, calculations can be easily performed using a microcomputer.
It can also be entered into memory.

〔Effect of the invention〕

As described above, the automatic door obstacle detection device of the present invention can set the position of the obstacle as a non-detection zone for obstacles that can be predicted in advance and do not interfere with the closing of the door. Therefore, even if a sticker or the like is pasted on the door, it can be detected as an obstacle and prevent the door from closing, and a single sensor can detect a large area between the door and the door. It is possible to reliably detect the presence or absence of an obstacle.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an automatic door surround in one embodiment of the present invention, FIG. 2 is a vertical side view thereof, and FIGS. 1 to 23 are block diagrams showing the electrical configuration. In the drawing, 1 and 2 are doors, 5 sensors, 11 a transmitter, 12 a receiver, 14 a transmitter controller, 15 a controller, 1
8 is a timer, 23 is a setting means, and 25 is an output control circuit.

Claims (1)

[Claims] (1) A sensor that is located near an automatic door and includes a transmitter that emits ultrasonic waves downward and a receiver that receives the reflected ultrasonic waves, and the receiver receives the reflected waves. and a control unit that measures the time it takes for the automatic door to close, and controls the automatic door not to close when the reception unit receives the reflected wave at a time interval shorter than a set value. In the device, the sensor is installed below the automatic door above the automatic door, the transmitter transmits the ultrasonic wave so that a part of the ultrasonic wave hits the automatic door, and the controller transmits the ultrasonic wave for a preset time. An obstacle detection device for an automatic door, characterized in that the device can be adjusted to close the automatic door when the receiving section receives the reflected wave.