JPH0719024Y2 - Sensor for automatic door - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a sensor for a non-contact type automatic door, which is used for the purpose of making a distinction between a person trying to open an automatic door and a passerby to detect the door.

[Conventional technology]

As the sensor of the automatic door, one having a characteristic according to the object to be detected, the use environment, etc. is selected and used. When the types of the sensors are classified into detection areas, as shown in FIG. 7, a two-dimensional sensor (20) for detecting a space (A) spreading in front of the sliding door type doors (1) and (2) with a certain area, Door (1)
A one-dimensional sensor (21) that detects a linear space (B) parallel to (2), and detects that there is a detection target such as a human hand at a detection point (C) near the center of the door. There is a point detection sensor (22).

The two-dimensional sensor (20) quickly detects that a detection object such as a person or a vehicle approaches the doors (1) and (2) and opens the doors (1) and (2) quickly. An example of the two-dimensional sensor (20) is a diffuse reflection photoelectric sensor that emits light toward a certain area range and detects whether light is reflected from the range.

The one-dimensional sensor (21) is mainly used as a safety switch for confirming that no person or object is present near the door when the door (1) (2) is closed. This is a transmissive photoelectric sensor with opposing light emitter and light receiver on both sides of the door,
There is a retroreflective photoelectric sensor in which a light emitter / receiver is arranged on one side of the door.

The point detection sensor (22) identifies a person who has a clear intention to open the door. If the intention indication such as reaching for the detection point provided near the center of the door is not displayed, the detection signal is detected. Does not occur. The purpose of this use is that there is no space for entrance and exit in front of the door, and the passage is just in front of the door,
This is to prevent the door from opening even if a passerby who does not need to open the door passes in front of the door. An ON / OFF type contact switch is used for this point detection sensor (22) to detect the touch of a person on the push board or door knob installed near the center of the door by the change in capacitance. There is a touch board etc.

Since there are many types of sensors for automatic doors as described above, either one of the two-dimensional sensor and the point detection sensor alone or in combination with the one-dimensional sensor, depending on the mounting environment,
It is installed.

[Problems to be Solved by the Invention]

The point detection sensor (22) described above is indispensable when the installation environment of the door is such that many passers-by simply pass by in front of the door. If a two-dimensional sensor is used instead of this, there are many problems such as noise due to unnecessary unnecessary opening and closing of doors, power consumption, and inflow of outside air into a room that has been air-conditioned.

By the way, when the point detection sensor is used, the detection point needs to be near the central portion of the door that is easily accessible. Since all the conventional point detection sensors have a detection element (mechanical switch, electrostatic capacity switch, etc.) arranged at the detection point, as shown in FIG. It is necessary to wire the signal line and power line to 23).

However, this wiring (24) is easily noticeable, and it is very aesthetically impaired especially in modern automatic doors, which are often made of transparent glass. Moreover, it is necessary to make a part of the wiring a curl cord that can be expanded and contracted so as not to interfere with the opening and closing operation of the door, which makes the wiring work complicated.

Some of the doors (2) are provided with a groove (25) for embedding the wiring (24) therein as shown in FIG. 9 so that the wiring does not spoil the appearance. However, in this case, the processing cost is very high and the door design is also limited.

In the point detection sensor, in order to eliminate the need for wiring, a transmitter is provided together with the detection element at the detection point as shown in FIG.
It is also conceivable that the radio waves emitted from here are received by the receiver of the door drive control unit (23). But in this case,
The detection element (27) and the transmitter (2
8) It is necessary to dispose the power supply battery (29) and the like, and the detection unit (26) becomes large in size, which impairs the aesthetics and causes maintenance complexity such as replacement of the power supply battery (29).

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a point detection sensor that does not require wiring, and has an extremely simple structure of the detection unit, which can eliminate the need for a power supply for the detection unit.

[Means for Solving the Problems]

In order to achieve the above object, the sensor for automatic doors of the present invention is
Fixed on at least one side of a sliding door, a thin reflector that reflects radiant energy such as light and heat rays from an object close to the door in a fixed direction along the door, and is arranged at a fixed position near the periphery of the door. , A drive that outputs the door open / close signal to the door drive unit by converting the radiant energy reflected by the reflector into a received electric signal by a radiant energy detecting means such as a photodiode / pyroelectric sensor to determine whether or not an object is approaching And a control unit.

Further, the drive control unit is not only a passive type in which radiant energy such as light and heat rays from an object close to the door is simply reflected by a reflector to detect it, but also a light is projected onto the reflector to front the door. It may be an active type including a light projecting means for reflecting the light in space together with an optical sensor which is the radiant energy detecting means.

[Action]

The sensor for an automatic door of the present invention detects the energy of an object such as a person's hand entering a small and limited space in front of the reflector and opens the door. In this case, it is not necessary for an object such as a human hand to touch the reflector, and the usability is remarkably improved as compared with a contact type such as an electrostatic sensor.

A reflector that reflects radiant energy such as light and heat rays from an object such as a person's hand near the door toward the detection means of the drive control unit located near the door periphery is a thin panel attached to the door. It is good and very simple,
Also, no wiring is required for this reflector. Further, the radiant energy from the object near the door is reflected by the reflector along the door to the radiant energy detecting means of the drive control unit. You only have to face the small area,
Allows for placement in an unobtrusive position near the door perimeter.

〔Example〕

 Hereinafter, embodiments will be described with reference to the drawings.

The automatic door drive apparatus shown in Embodiment 1 of FIGS. 1 to 4 is a double-door sliding door type door (1) (2) and a pair of doors (1) (2) which are vertically supported to open and close. A door driving unit (3) to be driven, a plurality of thin reflectors (4) fixed at fixed positions on the front and back surfaces of the pair of doors (1) and (2), and a door driving unit (3) It has a drive control section (5) for outputting an opening / closing control signal. The door drive unit (3) may be the same as the conventional one, and for example, as shown in FIG.
An endless strip (6) for suspending and supporting a pair of doors (1) and (2), and a rotating body (7) (8) horizontally stretching the strip (6).
And a motor (9) that reciprocally rotates the rotating bodies (7) and (8).
When the strip body (6) is rotated by the motor (9) through the rotating bodies (7) and (8) in the direction of the chain line arrow in FIG. 4, a pair of doors (1) and (2) are provided. Opens, and closes when rotated in the opposite direction.

The reflectors (4) fixed to the doors (1) and (2) are, for example, rectangular panel-shaped, and as shown in FIG. 3, a reflecting surface (m) inclined at an upper side at about 45 ° with respect to a horizontal plane. ) ... have.
The plurality of reflectors (4) have the same structure, and the reflecting surfaces (m) of the reflectors (4) are arranged so that light incident from the front of the door in a substantially orthogonal direction is guided along the doors (1) and (2). Reflect on top. The amount of the reflected light changes when an object (10) such as a person's hand approaches the door. The radiant energy detecting means (11) of the drive control section (5) is arranged at a fixed position corresponding to directly above each of the reflectors (4) ... When the doors (1) and (2) are closed. The detecting means (11) is, for example, a photodiode, a phototransistor, or the like when detecting a change in light amount. The detection means (11) receives the reflected light from the reflector (4) and converts it into an electric signal.

The drive control unit (5) is a means for detecting radiant energy (11)
When an electric signal from the detection means (11) is discriminated and it is detected that an object (10) such as a human hand is present near the doors (1) and (2), the door drive unit (3) opens the door. It has a control circuit (12) for outputting a signal. More specifically, when an object (10) such as a human hand approaches in front of the reflector (4) of the closed doors (1) and (2), the light from the object (10) is reflected by the reflector ( The light is reflected by the light reflecting surface (m) of 4) and is received by the detecting means (11). The detection means (11) outputs an electric signal according to the amount of received light to the control circuit (12), and the control circuit (12) performs a predetermined process on the input electric signal, for example, passing it through a differentiation circuit. After that, it is compared with the reference level to judge whether the object (10) has come close to the doors (1) and (2). If it is judged that the object (10) is present, the door is driven. A door open signal is output to the section (3) to drive the motor (9) to make a pair of doors (1) and (2).
Is left open for a certain period of time and then closed.

In the above door opening / closing operation, a large change in the amount of light traveling from the reflector (4) to the radiant energy detection means (11) can be caused by the movement of the object (10) near the reflector (4). This is the case when an object that is far away from the control circuit (1
By setting the sensitivity setting of 2) to an appropriate value, it is possible to detect only an object in the space limited to a point.

The object (10) close to the door is not limited to being detected by light, but may be a heat ray from the human body. In this case, a pyroelectric sensor may be used as the detection means (11). That is, an object (10) such as a human hand is attached to the reflector (4) of the door (1) (2).
Approaching, the presence of a person near the door is detected by the change in the heat ray incident on the pyroelectric sensor, and the doors (1) and (2) are opened. In this way, the doors (1) and (2) can be automatically opened and closed even at night.

The automatic door driving apparatus shown in FIG. 5 and FIG. 6 according to the second embodiment is a light projecting device which projects light from directly above the reflecting surfaces (m) of the reflectors (4) ... In the drive control section (5). Means (13) are attached. That is, the light projected from the light projecting means (13) onto the reflecting surface (m) of the corresponding reflector (4) is reflected by the reflecting surface (m) and projected toward the front of the door, and the projected light is near the door. When the object (10) is present in the object, the object (10) is reflected to return to the reflector (4), and is reflected right above the reflecting surface (m) to be received by the light receiving means which is the detecting means (11). Then, the doors (1) and (2) are opened. The light reflected from the light projecting means (13) to the reflector (14) and projected to the front of the door cannot return to the reflector (14) unless the object (10) is near the front of the reflector.
The doors (1) and (2) remain closed. The projected light from the light projecting means (13) may be visible light or infrared light,
The detection means (11) needs to be a photodiode or the like having a characteristic capable of detecting this.

The present invention is not limited to the above-described embodiment, and for example, a door reflector may have a light reflecting surface that directly reflects light from the front (or rear) of the door, and the door is made of transparent glass. In the case of a plate, a reflector may be embedded in the door so that the light reflected by the reflector is transmitted to the inside of the door.

[Effect of device]

According to the present invention, a point detection sensor that detects a specific object such as a person's hand trying to open a door by distinguishing it from other objects moving near the door is a non-contact method and a non-wiring method. It is an automatic door that can be provided, has good usability, is aesthetically pleasing, and is easy to install.

In particular, since it is only necessary to place a thin reflector at the detection point, it is possible to manufacture an automatic door excellent in design.

Further, the detection means of the drive control unit and the like can be arranged at inconspicuous fixed positions along the periphery of the door, and the appearance around the door is improved.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of the present invention, and FIG.
FIG. 3 is a cross-sectional view taken along the line AA in FIG. 3, FIG. 3 is a partially enlarged cross-sectional view of FIG. 2, and FIG. 4 is a front view of relevant parts for explaining a door opening / closing operation of the apparatus of FIG. FIG. 5 is a front view showing a second embodiment of the present invention, and FIG.
It is a principal part expanded sectional view of the drawing apparatus. FIG. 7 is a plan view of the automatic door for explaining the classification by the detection area of the automatic door sensor, FIG. 8 is a perspective view of the automatic door showing a wiring method of the point detection sensor, and FIG. 9 is a wiring diagram of the point detection sensor. FIG. 10 is a perspective view of one side of an automatic door in which a part is embedded in a door, and FIG. 10 is a perspective view showing a structure of a detection unit of a wireless point detection sensor. (1) (2) ... Door, (3) ... Door drive unit, (4) ... Reflector, (5) ... Drive control unit, (10) ... Object (person), (1
1) ... Radiation energy detection means, (13) ... projection means.

Claims (2)

[Scope of utility model registration request] 1. A fixed door on at least one side of a sliding door,
A thin reflector that reflects radiant energy such as light and heat rays from an object close to the door in a fixed direction along the door, and the radiant energy reflected by the reflector is disposed at a fixed position near the periphery of the door. An automatic door sensor, comprising: a radiant energy detecting means, which converts the received electric signal into an electric signal to determine whether or not an object is approaching, and outputs a door opening / closing signal to a door driving portion. 2. The drive control unit includes a light projecting unit for projecting light onto a reflector and a radiant energy detecting unit for receiving light recursively reflected from an object close to the door via the reflector. The sensor for an automatic door according to claim 1.