JPH04322026A - Automatic door by sensing of a plurality of high frequency proximity switches - Google Patents

Abstract

PURPOSE:To cope with incompatible function requirements so as to prevent erroneous operation by dividing an electronic mat, reducing sensitivity of the electronic mat, and achieving operation upon turning-on of a main mat. CONSTITUTION:An electronic mat is divided into a main mat 15 and a safety mat 16 for use. The mat 15 is embedded apart 100-200mm from a door while the mat 16 is embedded in the vicinity of the door. The mats 15, 16 are used in combination. The mat 16 is adapted to reduce sensitivity to such an extent that a variation in wave detection output caused by motion of the door cannot exceed a threshold value of ON of OFF of a switch. Upon motion of the mat 15 owing to the entrance of a person via the mat 15, an output of a comparator comp2 becomes 'H', and an output of an OR circuit OR1 also becomes 'H'. Accordingly, a transistor Q3 is turned on to output an opening signal. Additionally, an output of a NOR circuit NOR1 becomes 'L' so that another transistor Q2 is turned off, thus holding an automatic return type amplifier OP3 for a long period. Consequently, it is possible to cope with incompatible function requirements so as to prevent erroneous operation.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic door that opens and closes by detecting the presence or absence of a person using a high-frequency proximity switch having a plurality of sensing sections.

0002

[Prior Art] When a high frequency proximity switch is buried in the entrance/exit of an automatic door, the mat switch 3 is placed 100 mm to 20 mm away from the door 1 as shown in Fig. 6 so as not to be affected by the movement of the door.
They are installed 0mm apart. Therefore, there is a dead zone 4 between them, and when a person enters this zone, the door closes, creating a safety problem. In order to prevent this, a safety light switch 5 as shown in FIG. 7 is installed, but since this can only be detected in a straight line, two or three sets are required for safety.

0003

[Problem to be solved by the invention] Conventional high-frequency proximity switches (electronic mats) may malfunction due to the influence of doors made of metal frames, so it is recommended to bury electronic mats near the door rail. could not. If it is buried near the door (about 10 mm distance), the high frequency detection output will change depending on the movement of the door. Now, if the door is moved with the sensitivity set to normal, the detection output will exceed the switch ON-OFF threshold voltage Vsh as shown by the solid line depending on the door position, as shown in FIG. There is no problem on the open side because a person turns on the switch, but on the closed side, the switch is turned on again, opening and closing repeatedly, causing vibration. Therefore, it is necessary to set the sensitivity lower as shown by the broken line in Figure 4, and if this is done, there will be a defect that the electronic mat will not turn on even if a person approaches the mat during normal times when the door is closed. For this reason, as shown in FIG. 6, the electronic mat 3 could not be brought close to the door rail 2.

[0004] On the other hand, there is a method to avoid this by signal processing. FIG. 5 shows its block diagram. When no one is present, the high frequency output from the electronic mat 6 is detected by the detector 8.
The detected output is the gain A of the DC amplifier 9 (
The signal is amplified by the sensitivity indicated by the solid line in FIG. Comparator 10 selects the input signal and gives an OFF signal to relay 11, and the door is closed. When a person approaches the electronic mat 6, the detection output is amplified with the gain A, and the comparator 10 turns on the relay 11.
A signal is output and the door opens. After a person passes, relay 11 is set to O.
The FF signal is output, but the door controller closes the door at a certain interval (adjustable) after outputting the OFF signal. The OFF delay timer 12 turns OFF according to that time.
When a signal is input to the mono-multi (monostable multi-vibrator) 13, the mono-multi 13 switches the switching relay 1 for the time determined by the variable resistor VR5 (while the door is closed).
5, and during that period, switch to Vane B to achieve the sensitivity shown by the broken line in FIG.

[0005] Although a temporary solution can be obtained through such signal processing, in terms of detailed timing, for example, if the next person comes when the door is about to close, the electronic mat 6 will change to gain B, which has low sensitivity. Since the switch is switched on, the switch may not turn on. Also, since it is used as a safety mat, the DC amplifier 9 cannot be made into a reset type, and must be held permanently or for a long time. 3
It becomes necessary to use a microcomputer type door control device as proposed in Japanese Patent No. 5502. However, even in such a case, if the door is operated in the rain, the door may remain open for a long time or permanently at the beginning of rain.

[0006] The present invention has been made in view of the above-mentioned points, and an object of the present invention is to eliminate conflicting functional requirements imposed on automatic doors using high-frequency proximity switches and to prevent malfunctions. Our goal is to provide automatic doors without any problems.

[0007]

[Means for Solving the Problems] As shown in FIG. 1, the present invention solves the above problem by separating the electronic mat into at least two parts and using them as a main mat 15 and a safety mat 16. be. That is, the above object of the present invention is to
The main mat is buried at a distance of 10m from the door.
A combination of safety mats buried at a distance of 20 mm to 20 mm is used in combination, and the safety mats are designed to detect changes in detection output caused by the movement of the door when the switch is turned on.
This is achieved by an automatic door using a high frequency proximity switch with multiple sensitivities, which uses a high frequency proximity switch whose sensitivity is lowered to the extent that it does not exceed the OFF threshold value, and which operates the safety mat when the main mat is turned on. .

[0008]

[Effect] By lowering the sensitivity of the safety mat, the influence of door movement is removed, and people always use the main mat 1.
5, so when it is about to close, the safety mat 16
Even if the main mat 15 becomes insensible, there is no problem as long as the main mat 15 is normal. Furthermore, regarding permanent retention or long-term retention, which is a condition for a safety mat, simply speaking, the safety mat does not need to operate while the door is closed. Then, it is set to operate when the main mat 15 is turned on.

To explain this in terms of a long-term retention analog amplifier, an automatic reset type switch circuit as shown in FIG. 2 shown in Japanese Patent Publication No. 60-43293 is used. That is, an operational amplifier 17 inputs the detection signal DT from the mat switch to the positive side, a voltage follower 18 inputs its output S1 to the positive side and feeds it back to the negative side via the resistor R10, and a high frequency component of the detection signal DT. A filter 19 for removing the signal, a signal S2 obtained by adjusting the gain of the output DTA using a variable resistor VR10, and an operational amplifier 20 that inputs the output S1 and outputs a binary signal S3, and amplifies the output S3 to generate an automatic door. a switching circuit 22 that operates a relay 21 as a control circuit for the
A transistor Q4 as a switching element which is ON-OFF controlled by an inverted signal by T, a delay circuit 23 that delays the output S3, and the output S4 is compared with a reference voltage Re formed by a variable resistor VR11.
A comparator 24 that outputs a value signal S5 and its output S
A transistor Q5 is provided as a switching element which is ON-OFF controlled by a transistor Q5, and resistors R15 and R17 are connected to the respective collectors of the transistors Q4 and Q5, and are also connected to the input of a voltage follower 18.

Here, the operational amplifier 2 of the voltage follower 18
When the main mat 15 is off for a long time, the transistor Q5 is turned on to always reset the reset circuit of the transistor Q5 and the resistor R17, which is connected in parallel to the capacitor C10 connected to the positive input of the main mat 15. If the reset is canceled by turning off the transistor Q5 at the same time that the main mat 15 is turned on, a long-term retention can be obtained unless a reset is applied. Therefore, as long as the person is on the safety mat, it will hold for a long time and will not get caught in the door. If this is done digitally using a microcomputer, it can be retained permanently unless reset.

[0011]

[Embodiment] As an embodiment of the present invention, a circuit of an analog electronic mat with a simple safety mat is shown in FIG. The high-frequency oscillator 26 oscillates at a frequency f0 using a transistor Q1, a coil L3, and a capacitor C3, and the safety mat side adjusts the safety mat capacitance Cc1, variable capacitance C1, and coil L1 to bring the resonant frequency f1 closer to f0, and
Main mat side has main mat capacity Cc2, variable capacitance C
2 and the coil L2 to bring the resonance frequency f2 closer to f0. Analog switches AN1 and AN2 are INV1
The output O1 of the high frequency oscillator is controlled by the output signals A and B from INV2 and is alternately switched, and the output O1 of the high frequency oscillator becomes the output modulated by the chopper, and the analog switch AN3 is synchronized with the analog switches AN1 and AN2, respectively.
and enters AN4 and is discriminated.

Here, the output signal on the safety mat side is connected to the resistor R1.
It is smoothed by a filter from the capacitor C5, and is input to the automatic reset type amplifier OP3 through the voltage follower OP1. On the other hand, the main mat side output signal is smoothed by a filter consisting of a resistor R2 and a capacitor C6, and is input to the voltage follower OP4. The set voltage of comparators Comp1 and Comp2 is set by variable resistor VR3.
When VR4 is set to positive side < negative side during steady state when no one is present, the outputs of comparators Comp1 and Copm2 become "L", and the output of OR circuit OR1 also becomes "L".
Therefore, transistor Q3 is OFF and relay Ry does not operate. In addition, the inputs of the NOR circuit NOR1 both become "L", the transistor Q2 turns on, and the leakage resistor R6 enters in parallel with the capacitor C7, which shortens the recovery time of the recovery amplifier OP3, and prevents it from operating due to rain, etc. Even if the safety mat side closes immediately and sends a signal.

[0013] As a normal action, a person first moves on the main mat 1.
It comes in from 5. Therefore, when the main mat 15 operates, the output of the comparator Comp2 becomes "H", the output of the OR circuit OR1 also becomes "H", and the transistor Q3
turns ON, relay Ry operates and issues an open signal. On the other hand, the output of the NOR circuit NOR1 becomes "L", the charge of the capacitor C9 is discharged by the diode D2, and the transistor Q
2 is turned OFF, and the automatic reset type amplifier OP3 is held for a long time. Therefore, if someone is on the safety mat when the door is open, it will be held for a long time.

Regarding the sensitivity of the safety mat, relay Ry
When is OFF, the contact 1b is closed, and the sensitivity is as indicated by the broken line in FIG. 4, and there is not much sensitivity. Also, relay Ry is O
At N, that is, when the door is fully opened from the beginning,
It has normal sensitivity in the state indicated by the solid line in FIG.

[0015]

[Effects of the Invention] As described above, according to the automatic door using multiple high-frequency proximity switches of the present invention, by separating the electronic mat, conflicting effects regarding the influence of the door and switch sensitivity, as well as automatic return and long-term retention can be resolved. Handle functional requests as necessary to prevent malfunctions.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the arrangement of an electronic mat of the present invention.

FIG. 2 is a circuit diagram showing an example of an automatic reset type switch.

FIG. 3 is a circuit diagram showing an embodiment of the invention.

FIG. 4 is a diagram showing the relationship between the electronic mat output and the door position.

FIG. 5 is a signal processing block diagram of the electronic mat.

FIG. 6 is a diagram illustrating a state in which a conventional mat switch is buried.

FIG. 7 is a diagram showing an overview of a safety light switch.

[Explanation of symbols]

1 Door 2 Door rail 3 Mat switch 4 Dead zone 5 Safety light switch 6 Electronic mat 7 High frequency oscillator 8 Detector 9 DC amplifier 10 Comparator 11 Relay 12 OFF delay timer 13 Mono multi 14 Switching relay 15 Main mat 16 Safety mat 17 Operational amplifier 18 Voltage follower 19 Filter 20 Operational amplifier 21 Relay 22 Switching circuit 23 Delay circuit 24 Comparator 25 Operational amplifier 26 High frequency oscillator 27 Detector

Claims (1)

[Claims] 1. The electronic mat is separated into at least two parts, one of which is a main mat that is buried 100 mm to 200 mm away from the door, and the other is a safety mat that is buried close to the door. The safety mat is used with its sensitivity lowered to such an extent that the change in detection output caused by the movement of the door does not exceed the switch ON-OFF threshold value, and when the main mat is turned on, , an automatic door using multiple sensing high-frequency proximity switches, characterized in that the safety mat is activated.