JPH0374055B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to the structure of an electronic mat used for automatic doors and the like.

By the way, the electronic mat is used as a passerby detection device for automatic doors, and the first
As shown in the figure, electronic mat (passerby detection device) 1
0 is buried under the floor near the bottom of the automatic doors 2 and 3, and a control circuit 4 including an oscillation circuit and a switch circuit is arranged in a lintel 6 above the mullion 5. The electronic mat 10 and the control circuit 4 are connected by a signal transmission line 7, and the control circuit 4 is operated according to the signal from the electronic mat 10, thereby controlling the opening and closing of the automatic doors 2 and 3. be.

By the way, high-frequency oscillation type proximity switches (electronic mats) used in automatic doors of buildings, etc. are composed of two sensing plates buried in the floor, and the oscillating part emits signals of 1 to 20 MHz. The sensing plate is used as part of the oscillation circuit by oscillating a high frequency. When the human body approaches the oscillator, the frequency of the oscillator circuit changes due to the floating amount and resistance loss between the human body and the sensing plate, and the output level changes as the sharpness Q changes. do. Then, the amount of change is taken out to the outside to operate a switch section, thereby controlling the opening and closing of the door.

FIGS. 2A and 2B show the structure of a conventional sensing plate device and how it is buried. A resin frame 13 is sandwiched between two sensing plates 11 and 12, and an electronic device such as a transistor is placed between the two sensing plates 11 and 12. A printed circuit board circuit 14 with mounted elements is disposed, and lead wires 15 and 16 from the printed circuit board circuit 14 are connected to sensing plates 11 and 12, respectively, by soldering or the like.
After making the predetermined adjustments, the mold 17
This is to be fixed in place and buried under the floor near the automatic door. In addition, power is supplied to the printed circuit board circuit 14 via a transmission line 18, and detection signals detected by the sensing plates 11 and 12 are transmitted to a switch circuit separately installed in the automatic door drive section. The door is controlled to open and close based on the detection signal.

On the other hand, so-called foot-operated switches that use micro switches, limit switches, etc. have traditionally been used as switches for automatic doors that are only used by special people, such as in hospital operating rooms. The disadvantage is that you have to press hard. There are also switches that use light, but they have the disadvantage of requiring you to insert your foot into the light path to block the light. Furthermore, when the above-mentioned electronic mat is used as it is in such a wall-mounted switch, the operation will be as follows. That is, when a passerby (for example, a doctor or nurse) wants to open the door 20, he or she approaches the electronic mat 10 embedded in the wall 22 with his or her foot, thereby opening the door 20. By operating the electronic mat 10 with the foot in this manner, the door 20 will not open even when passing near the door 20, and the door 20 can be easily opened and closed even when passing with luggage in hand. I can do it. This is because in an operating room or the like, it would be a problem if the door opened randomly, and it would be sufficient if only those who knew the switch position could pass through. Here, the installation of this foot-operated type electronic mat is shown in sectional view A-A' as shown in Figure 4.
An electronic mat 10 is disposed within a wall 22 connected to a pillar 21 with its sensing side plate facing outward. Therefore, the radiated radio wave EW of the sensing side plate and the radiated radio wave EWS of the grounded side plate are radiated, and the radiated radio wave EW of the sensing side plate
When the foot of a passerby is detected and the door 20 opens, the door 20 moves in the direction of the arrow, and this door 20 is detected again by the radiated radio wave EWS of the ground side plate. For this reason, the door 20 of the radiated radio EWS
When the door 20 is re-detected, the door 20 is opened again, causing the problem that the door 20 is difficult to close. Note that the wall of the ground side plate is usually finished with decorative board or wallpaper, and inside the wall 22 there are steel pole laths 2.
3, absorption of radio waves EW by this lath 23 also becomes a problem.

Furthermore, FIG. 5 shows a case where a conventional electronic mat is embedded and installed in a metal wall 24. In this case, the radio waves EW radiated from the sensing side plate 11 are transmitted to the metal wall 24. The drawback was that accurate detection could not be done because it was absorbed.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a structure for an electronic mat that is free from the above-mentioned drawbacks and problems.

This invention will be explained below.

In the present invention, an oscillating part or an oscillation supply part is sandwiched between a parallel ground side plate and a sensing side plate embedded in a wall facing a passage of an automatic door, and the sensing side plate is disposed on the passage side. Regarding the structure of the electronic mat, the area of the ground side plate is made larger than the area of the sensing side plate, so that the density of radio waves radiated from the ground side plate is reduced.

That is, FIG. 6 shows the principle of a structural example of the present invention, in which the electronic mat 30 is composed of two sensing plates (sensing side plate 31 and grounding side plate 32), and the sensing plate 31 and the oscillating section ( (or oscillation supply unit) 33 is held in between. The area of the ground side plate 32 is made larger than the area of the sensing side plate 31. Here, the relationship between the sensitivity (radiated radio wave density) of the sensing side plate 31 and the sensitivity (radiated radio wave density) of the ground side plate 32 with respect to the area ratio of the sensing side plate 31 and the ground side plate 32 is shown in FIG. 7 according to the experimental results. It became like that. In the figure, indicates the sensitivity (detection distance) of the ground side plate 32 that increases the relative area, and indicates the sensitivity (detection distance) of the sensing side plate 31 that decreases the relative area. The characteristic is a curve representing the ratio of the characteristic to the characteristic. Based on this experimental result, in the present invention, the area ratio between the sensing side plate 31 and the grounding side plate 32 is set to about 1:2.5, and the ratio of the radiated radio wave density between the sensing side plate 31 and the grounding side plate 32 is set to about 5:1. to configure an electronic mat.

FIG. 8 shows an example of the structure of an electronic mat according to the present invention, in which an electronic mat 30 consisting of a sensing plate 31 with a small area and a ground side plate 32 with a large area is placed inside a wall 22. It is buried so that the radio wave EW faces outward (sensing direction). In this case, the density of the radiated radio waves EWS from the grounded side plate 32 of the electronic mat 30 is extremely low and is radiated to the inside of the wall 22 (non-sensing direction surface), so the inside of the wall 22 is Even if such a door moves, there is no need to detect this door and open or close the door again.

Furthermore, the examples shown in FIGS. 9 and 10 are examples in which an electronic mat is buried in a metal wall 30, and the example in FIG. It is embedded in the wall 30. A decorative plate 4 made of resin or the like is attached to both ends of the sensing plate 41.
2 is arranged to maintain the aesthetic appearance. In this case, the sensing plates 40 and 41 constitute an electronic mat, and the radio waves radiated from the sensing plate 40 are used to detect a person's feet or the like. Note that the space between the sensing plates 40 and 41 may be air, or may be made of a high frequency insulating material such as foamed resin. Furthermore, in the example shown in FIG.
0, and the sensing plate 4 is embedded in the insulating material 44.
0 and 43 are arranged to form an electronic mat. Detection operations similar to those described above can be performed using each of these electronic mats.
In any of the above examples, an oscillation section or an oscillation supply section for the electronic mat is disposed between the two sensing plates.

As described above, according to the electronic mat of the present invention,
By setting the area ratio of the sensing side plate and the grounding side plate to approximately 1:2.5, the radiated radio wave density of the sensing side plate is increased, making it ideal for use as a wall-mounted electronic mat.

[Brief explanation of drawings]

Figures 1 and 2 A and B are diagrams showing the state of a conventional electronic mat, Figure 3 is a diagram showing the state of a foot switch, and Figure 4 is a cross-sectional view taken along line A-A' in Figure 3. FIG. 5 is a diagram showing the electronic mat embedded in a metal wall, FIG. 6 is a diagram showing the basic structure of the electronic mat of the present invention, and FIG. 7 is a diagram showing the principle of the present invention. FIG. 8 is a diagram showing an example of the arrangement of an electronic mat according to the present invention, and FIGS. 9 and 10 are structural diagrams showing other embodiments of the present invention. 2, 3, 20...door, 4...control circuit, 10,3
0...electronic mat, 21...pillar, 22, 24, 30...
Wall, 31, 32, 40, 41, 43... Sensing plate, 4
2... Decorative board.

Claims (1)

[Scope of Claims] 1. An oscillating part or an oscillation supply part is sandwiched between a parallel ground side plate and a sensing side plate embedded in a wall facing the passageway of the automatic door, and the sensing side plate is disposed on the passageway side. In the electronic mat that is installed,
An electronic mat characterized in that the area of the ground side plate is larger than the area of the sensing side plate, and the density of radio waves radiated from the ground side plate is reduced. 2. The electronic mat according to claim 1, wherein the area ratio of the sensing side plate to the grounding side plate is approximately 1:2.5. 3. Claim 1 or 2, wherein the grounding side plate is formed into a concave shape, and the sensing side plate is disposed inside the ground side plate.
Electronic mat as described in section. 4. Claim 1 or 2, wherein the grounding side plate and the sensing side plate are arranged in a concave insulating material.
Electronic mat as described in section.