JPH0322466Y2 - - Google Patents

Description

[Detailed description of the invention] This invention detects the presence or absence of objects passing by, such as people or vehicles, in the detection area near the door, detects the direction of movement of the objects, and outputs a door open signal or a door close signal. Regarding automatic door detectors.

This type of conventional automatic door detector will be explained based on FIGS. 1 to 4.

FIG. 1 shows the structure disclosed in Japanese Patent Publication No. 51-13594, which has been replaced with a different form. As shown in FIGS. 3 and 4, S1 is a first switch that forms a first detection area A1 just in front of the door D and detects the presence or absence of a passing body in the first detection area A1, and the first switch S1 outputs a signal H when a passing body exists in the first detection area A1, and outputs a signal L when a passing body does not exist in the first detection area A1.
As shown in FIGS. 3 and 4, S2 is a second switch that forms a second detection area A2 on the opposite side of the door side of the first detection area A1 and detects the presence or absence of a passing object in the second detection area A2. The second switch S2 outputs a signal H when a passing body exists in the second detection area A2, and outputs a signal L when a passing body does not exist in the second detection area A2. The first switch S1 is connected to one input terminal of the first AND circuit AN1 via the NOT circuit NO1, and the second switch S2 is connected to the other input terminal of the first AND circuit AN1. AND circuit AN1
The signal from the first switch S1 is input after being inverted, and the signal from the second switch S2 is also input to the switch. Further, the first switch S1 is connected to one input terminal of the second AND circuit AN2, and the first switch S1 is connected to one input terminal of the second AND circuit AN2.
The output terminal of the AND circuit AN1 is connected to the other input terminal of the second AND circuit AN2 via an off-delay type delay timer T2. That is, the second AND circuit AN2 receives the signal from the first AND circuit AN1 with an off-delay delay timer T2. The signal from the first switch S1 is inputted through a delay timer T2 of the type shown in FIG. The output terminal of the second AND circuit AN2 outputs a door open signal or a door close signal.

Next, the operation of the conventional automatic door detector having the above configuration will be described.

In a normal state where there are no passing bodies in the first detection area A1 and the second detection area A2, the first AND circuit
The signal L from the first switch S1 is inverted by the NOT circuit NO1 and input as a signal H to the AN1, and the signal L from the second switch S2 is also input. Therefore, the first AND circuit AN1 outputs a signal L, which is input to the second AND circuit AN2 via the delay timer T2. Further, the second AND circuit AN2 includes a first switch S1.
A signal L is also input. For this reason, the second
AND circuit AN2 outputs signal L (door close signal).

In this normal state, when the passing object N moves in the direction of arrow X as shown in Fig. 3 [see Fig. 2 a], when the passing object N enters the second detection area A2, the second switch S2 turns on the signal. The signal H is input to the first AND circuit AN1. At this time, since another signal H has already been input to the first AND circuit AN1, the first AND circuit AN1
outputs a signal H, and this signal H is input as is to the second AND circuit AN2. However, the second AND circuit AN2 receives the signal L from the first switch S1.
is also input, the second AND circuit AN2 holds the signal L (door close signal). Then, when the passing body N enters the first detection area A1, the first switch S1 outputs a signal H, and this signal H is input to the second AND circuit AN2, and the NOT circuit
It is inverted at NO1 and input as a signal L to the first AND circuit AN1, and the first AND circuit AN1 outputs the signal L. However, since the delay timer T2 is of the off-delay type, the signal H is kept for the set time t2.
hold. Therefore, the second AND circuit AN2 is 2
When two signals H are input, a signal H (door open signal) is output. Then, the set time t2
After the delay timer T2 has elapsed, the delay timer T2 outputs a signal L, and this signal L is input to the second AND circuit AN2, and the second
AND circuit AN2 outputs signal L (door close signal).

In addition, in the above normal state, when the passing object N leaves the door D in the direction of the arrow Y as shown in FIG.
, the first switch S1 outputs a signal H, this signal H is inverted by the NOT circuit NO1 and inputted as a signal L to the first AND circuit AN1, and the first AND circuit AN1 outputs a signal L. It remains as it is. Also, the signal H from the first switch S1
is also input to the second AND circuit AN2, but since the second AND circuit AN2 also receives the signal L from the delay timer T2, it continues to output the signal L (door close signal). Then, when the passing body N enters the second detection area A2, the second switch S2 activates the signal H.
This signal H is input to the first AND circuit AN1, but since the first AND circuit AN1 already has one signal L input, it holds the output signal L, and the second AND circuit AN2 Continue to output signal L (door close signal). After that, when the passing object N leaves the first detection area A1, the first switch S1 outputs a signal L, and this signal L is sent to the not circuit NO1.
The first AND circuit AN
1. The first AND circuit AN1 receives two signals H and outputs the signal H.
is input to the second AND circuit AN2. but,
Since the second AND circuit AN2 also receives the signal L from the first switch S1, the signal L (door close signal)
continues to be output. Further, when the passing body N leaves the second detection area A2, the second switch S2 outputs the signal L, the first AND circuit AN1 to which this signal L was input outputs the signal L, and the second AND circuit
AN2 continues to output signal L (door close signal).

In this way, the conventional automatic door detector detects when a passerby N heads toward door D and outputs a door open signal, and conversely detects when the object N moves away from door D and outputs a door close signal. Output.

However, the conventional automatic door detector described above is
As shown in the figure, after the first traffic object N1 enters the first detection area A1 from the arrow Y direction, a second traffic object enters the first detection area A1 from the arrow X direction a little later, causing a problem. There is still room for improvement, which will be explained below based on the time chart in FIG. 2C.

When the first object N1 enters the first detection area A1, the first switch S1 outputs a signal H, and this signal H is input to the second AND circuit AN2, but the first AND circuit AN1 Signal L is input and signal L is output, and this signal L is also
Since the signal is input to the AND circuit AN2, the second AND circuit AN2 outputs the signal L (door close signal).
When the second passing object N2 enters the second detection area A2 a little later than this, the second switch S2 outputs a signal H, and this signal H is sent to the first AND circuit AN.
1, but the first AND circuit AN1 inputs the first
Since the signal H from the switch S1 is inverted and input as the signal L, the signal L is still being output, and this signal L is input to the second AND circuit AN2, so the second AND circuit AN2 Even if the signal H from switch S1 is input, the signal is low.
(Door close signal) continues to be output. After this,
The first object N1 enters the second detection area A2, but the second AND circuit AN2 outputs a signal L (door close signal).
is maintained, and then, even when the second passing object N2 enters the first detection area A1, the second AND circuit AN2 continues to output the signal L (door close signal). moreover,
Even if the first passing object N1 is away from the second detection area A2 and the second passing object N2 is present in the first detection area A1, the second AND circuit AN2 outputs the signal L.
(Door close signal) continues to be output.

In other words, the conventional automatic door detector does not output a door open signal if the first switch S1 outputs the signal H before the second switch S2. If the second traffic object N2 enters the second detection area A2 with a slight delay after entering area A1, the first traffic object N1
is away from the second detection area A2 and the second traffic object N2
There is a problem in that the door open signal is not output even if the door is present in the first detection area A1. Therefore, even if the second passerby N2 waits in front of the door D, the door D will not open.
The vehicle must sequentially enter the detection area A2 and the first detection area A1.

Therefore, the present invention provides that in the conventional automatic door detector described above, the first passing body N1 is located in the first detection area A.
1, the second traffic object N2 enters the second detection area A2 with a slight delay, and the first traffic object N1 moves away from the second detection area A2 and the second traffic object N2 enters the first detection area A1. If only exists in
The technical challenge is to output a door open signal.

The technical means of the present invention for solving this technical problem is that, in the above-mentioned conventional automatic door detector,
a third AND circuit into which the signal from the second switch S2 is inverted and then input, and into which the signal from the first switch S1 is also input; the signal from the third AND circuit and the signal from the second AND circuit AN2; The reason is that an OR circuit is provided to which the input signal is input.

According to the present invention having this technical means, the fourth
As shown in the figure, after the first vehicle N1 enters the first detection area A1, the second vehicle N1 enters the first detection area A1.
2 enters the second detection area A2, and when the first passing object N1 leaves the second detection area A2 and the second passing object N2 is present in the first detection area A1, the third AND circuit switches the second switch S2. The signal L from the first switch S1 is inverted and inputted as the signal H, and the signal H from the first switch S1 is inputted and outputs the signal H. This signal H is inputted to the OR circuit, so the second AND circuit AN2 Even if the signal L from the
Output. Therefore, when the second passing object N2 comes near the door D, the door D opens, and it is not necessary to go back once and then proceed to the second detection area A2 and the first detection area A1 again as in the conventional case. do not have.

Furthermore, the present invention having the above technical means has the following unique effects.

That is, when a passing object N passes through the first detection area A1 and the second detection area A2 in the direction of arrow Y and leaves the door D as shown in FIG. 3, the passing object N exists only in the first detection area A1. Then, the third AND circuit receives the signal H from the first switch S1, inverts the signal L from the second switch S2 and inputs it as a signal H, and outputs the signal H.
Since this signal H is input to the OR circuit, the OR circuit outputs the signal H (door open signal). Then, when the passing body N enters the second detection area A2, the third detection area
The AND circuit outputs the signal L by inverting the signal H from the second switch S2 and inputting it as a signal L, and this signal L is input to the OR circuit, so the OR circuit receives two signals L. Outputs signal L (door close signal). Therefore, without impairing the conventional direction detection function, it is possible for the passerby N to move to the first
As long as the door open signal exists only in the detection area A1, the door D remains open and the passing body N does not come into contact with the door D during the closing operation. Also,
The case where the first traffic object N1 moves in the direction of the arrow Y as shown in FIG. 4 is also substantially as described above.

An embodiment of the present invention shown in FIGS. 5 and 6 will be described below.

In FIG. 5, AN3 is the third AND circuit,
OR2 is an OR circuit. 3rd AND circuit AN3
One input terminal of the
The other input terminal is connected to the first switch S2 through an off-delay type delay timer T1.
1, and the third AND circuit AN3 is connected to the second
The signal from the switch S2 is inverted and inputted, and the signal from the first switch S1 is inputted via the delay timer T1. One input terminal of the OR circuit OR2 is connected to the output terminal of the third AND circuit AN3, and the other input terminal is connected to the output terminal of the second AND circuit AN2.
A signal from the AND circuit AN2 and a signal from the third AND circuit AN3 are input, and its output terminal outputs a door open signal or a door close signal. OR1 is an off-delay type delay timer T2 and a second AND circuit.
This is an OR circuit provided between the AND circuit AN2, and the output terminal of the second AND circuit AN2 is connected to the input terminal of the OR circuit OR1 so as to be self-maintained. Note that other constituent parts that are the same as those of the prior art are given the same reference numerals as in FIG. 1, and their explanations will be omitted.

The operation of this embodiment will be briefly explained based on the time chart shown in FIG.

First, a case will be described in which a passing object N heads toward door D from the direction of arrow X as shown in FIG. 3 [see FIG. 6a].

When the passerby N enters the second detection area A2,
The signal L from the first switch S1 is connected to the second AND circuit.
Since it is input to AN2 and the third AND circuit AN3, the second AND circuit AN2 and the third AND circuit AN3 output the signal L, and the OR circuit OR2
continues to output signal L (door close signal).

When a passing object N enters the first detection area A1,
The third AND circuit AN3 continues to output the signal L, but the delay timer T2 holds the signal H for the delay time t2, and the second AND circuit AN2 outputs the signal H.
The OR circuit OR2 outputs signal H (door open signal)
Output.

When the passing object N leaves the second detection area A2 and exists only in the first detection area A1, the third AND circuit AN3 receives the signal L from the second switch S2.
is inverted and input as signal H, and the first
Signal H from switch S1 is input and signal H is output. At this time, the second AND circuit AN2 continues to output the signal H.

When the passing object N leaves the first detection area A1,
The off-delay type delay timer T1 holds the signal H for a preset delay time t1, and the second AND circuit AN2 and the third AND circuit AN3 hold the signal H.
continues to be output, and OR circuit OR2 holds signal H (door open signal).

When the passing body N leaves the first detection area A1 and the delay time t1 has elapsed, the second AND circuit AN2 and the third AND circuit AN3 output the signal L because the signal L is input, and the OR circuit OR2 outputs the signal L. L
Outputs (door close signal).

Next, as shown in FIG. 3, the case where the passing object N leaves the door D in the direction of the arrow Y [see FIG. 6b] will be described.

When a passing object N enters the first detection area A1,
The third AND circuit AN3 receives the signal H from the first switch S1, inverts the signal L from the second switch S2 and inputs it as a signal H, and outputs the signal H. Therefore, the OR circuit OR2 outputs a signal H (door open signal). At this time, the second AND circuit AN2 continues to output the signal L.

When the passerby N enters the second detection area A2,
The third AND circuit AN3 inverts the signal H from the second switch S2 and inputs it as a signal L.
Output. At this time, the first AND circuit AN1 inverts the signal H from the first switch S1 and outputs the signal L.
Since the signal L is inputted as
AND circuit AN2 outputs signal L. Therefore, OR circuit OR2 outputs signal L (door close signal).

When the passing object N leaves the first detection area A1,
The first switch S1 outputs the signal L, but since the delay timer T1 holds the signal H, the previous state continues. After the delay time t1 of the delay timer T1 elapses, the first switch
The AND circuit AN1 receives two signals H and outputs the signal H, but the second AND circuit AN2 and the third AND circuit AN3 receive the signal L and output the signal L, and the OR circuit OR2 outputs the signal H. Continue to output signal L (door close signal). Then, even if the passerby N leaves the second detection area A2, the OR circuit
OR2 continues to output signal L (door close signal).

Next, as shown in FIG.
after trying to leave door D, the second passing object N2
The case where the person faces door D [see FIG. 6c] will be explained.

When the first object N1 enters the first detection area A1, the third AND circuit AN3 switches the first switch S
The signal H from the second switch S2 is inputted, and the signal L from the second switch S2 is inverted and inputted as the signal H, and the signal H is output. Therefore, OR circuit OR2
outputs signal H (door open signal). At this time, the first
The AND circuit AN1 receives the signal L from the second switch S2 and outputs the signal L. This signal L is input to the second AND circuit AN2, so the second AND circuit AN2 outputs the signal L. .

After that, the second traffic object N2 moves to the second detection area A.
2, the third AND circuit AN3 outputs the signal L because the signal H from the second switch S2 is inverted and input as the signal L. At this time, the first AND circuit AN1 receives the inverted signal H from the first switch S1 as the signal L and continues to output the signal L, so the second AND circuit AN2
It also outputs signal L. Therefore, the OR circuit OR
2 outputs signal L (door close signal).

This state continues until the first object N1 passes through the second detection area A2. When the first passing object N1 leaves the second detection area A2 and the second passing object N2 exists only in the first detection area A1, the third AND circuit AN3 inverts the signal L from the second switch S2 and outputs a signal. At the same time, the signal H from the first switch S1 is input and the signal H is output. Therefore, the OR circuit OR2 outputs a signal H (door open signal). At this time, the first AND circuit AN
1 receives the signal L from the second switch S2 and outputs the signal L, and this signal L is input to the second AND circuit.
Since it is input to AN2, the second AND circuit
AN2 outputs signal L.

Even if the second object N2 leaves the first detection area A1, the delay timer T1 holds the signal H, so the third AND circuit AN3 continues to output the signal H, and the OR circuit OR2 outputs the signal H ( door open signal). When the delay time t1 of the delay timer T1 has elapsed, the third AND circuit AN3 receives the signal L from the first switch S1 and outputs the signal L. At this time, since the signal L from the first switch S1 is also input to the second AND circuit AN2, the second AND circuit AN2 outputs the signal L. Therefore, OR circuit OR2 outputs signal L (door close signal).

[Brief explanation of drawings]

Figure 1 is a conventional automatic door detector, Figure 2 is a time chart showing the operation of the detector, Figures 3 and 4 are explanatory diagrams showing an example of the detection area of the automatic door detector, FIG. 5 is an embodiment of the automatic door detector of the present invention, and FIG. 6 is a time chart showing the operation of the embodiment. D... Door, A1... First detection area, A2...
Second detection area, S1...First switch, S2...
...Second switch, AN1...First AND circuit, T
2...Delay timer, AN2...2nd AND circuit,
AN3...Third AND circuit, OR...OR circuit.

Claims (1)

[Scope of utility model registration request] A first switch detects the presence or absence of a passing object in a first detection area formed just before the door, and a second detection area formed overlapping the first detection area on the opposite side of the first detection area to the door side. a second switch that detects the presence or absence of a body; and a first AND circuit into which the signal from the first switch passes through an off-delay type first delay timer and is inverted and is inputted, and the signal from the second switch is also inputted. and the signal from the first AND circuit is connected to the off-delay type second AND circuit.
a second AND circuit to which a signal is input via the delay timer and a signal from the first switch; A first OR circuit receives the signal from the second delay timer and receives the output signal from the second AND circuit and outputs the signal to the second AND circuit, and the signal from the second switch is inverted. a third AND circuit to which is input the output signal output from the first switch via the delay timer, and a signal from the third AND circuit and the second
An automatic door detector equipped with a second OR circuit into which the signal from the AND circuit is input.