JPH0367598B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to an improvement in a situation monitoring device that detects the number and distribution of passengers in a limited space, such as an elevator car, and is useful for crime prevention, etc. It is something.

[Conventional technology and problems]

JP-A No. 60-25028 "Situation Monitoring Device" for detecting the number and position of passengers in an elevator car
There is.

First, the above-mentioned situation monitoring device will be explained.

The situation monitoring device includes a fixed slit for setting the field of view, a rotary plate having a slit that intersects the fixed slit, and a detection element (pyroelectric infrared detection element) that outputs a signal in response to changes in incident infrared rays.
and a signal processing section that processes the output signal of the detection element to determine the number and position of people.

The pinhole is formed at the intersection of the fixed slit and the slit of the rotary plate, and scanning is performed by rotating the rotary plate.

In addition, to divide the field of view, multiple fixed slits are provided, and the slits corresponding to each fixed slit are placed on the rotary plate at different positions, so that the timing of pinhole scanning is different for each field of view. Detection of each field of view is performed using .

FIG. 1A is a diagram showing the appearance of one embodiment of the sensing section of the situation monitoring device. In the figure, 1 is the entire sensing section, 2 is a case, 3 is a rotating plate attached to the front of the case 2, It is driven at a constant speed by a scanning motor (not shown). The rotating plate 3 has slits S1A to S1C.
and S2A to S2C are provided, and play a role as a reticle plate.

FIG.
LA to LC are provided, and as the rotating plate 3 rotates, the slits S1A and S2A change to the slit LA.
Similarly, slits S1B and S2B intersect with slit LB, and slits S1C and S2C intersect with slit LC.

4 is a detection element fixed inside the case 2. Although the rotating plate 3 (reticle plate) is shown attached to the outside of the case 2 for convenience of explanation, it is actually preferable to attach it to the inside of the case 2 for reasons such as design. Furthermore, the number of sensing elements 4 may be one, but the number corresponding to each slit may be attached.

FIG. 2 is a partially enlarged view of FIG. 1, showing how pinholes are formed by the intersection of the slits. Here, a pinhole P formed by the slits LA and S1A is shown, and as the rotary plate 3 rotates in the direction of the arrow, the pinhole P
moves from the left end of slit LA to the right end. Similarly, pinholes are sequentially formed in the slits LB and LC, which move as the rotary plate 3 rotates.

FIG. 3 is a diagram showing, as an example, a state in which the sensing section is attached to the ceiling of the car. 5 is an elevator car, and here the field of view is divided into three fields of view, A to C zones, and each zone is further divided into three zones, A to C, by a synchronization signal, which will be described later.
It is divided into 9 sections in total. A
The three divisions of zones a to c are determined by the distance between the slit LA and the sensing element 4 and the size of the slit LA, and similarly, the B zone is defined by the slit LB.
The C zone is respectively set by the slit LC. When the rotary plate 3 rotates, zones A to C are sequentially scanned by the movement of the pinhole, and in this example, each zone is scanned twice in one rotation of the rotary plate 3.

Figure 4 shows the relationship between the scanning position for each zone in one scan and the waveform of the output signal of the detection element 4 over time on the horizontal axis, and A indicates the division of each zone. B shows an example of the waveform of the output signal of the sensing element.

Hall is a synchronization signal corresponding to each section, and since the rotary plate 3 rotates at a constant period, these signals can be easily obtained using, for example, a photo interrupter and a timer.

Note that t ₁ is the point at which scanning of the A zone starts, that is, the point where slits S1A and LA begin to intersect, and t ₂ is the point at which the A zone begins to intersect.
At the end of zone scanning, that is, at slit S1A
and LA end their intersection, respectively, and
Similarly, t ₃ and t ₄ indicate the scanning period of the B zone, and t ₅ and t ₆ indicate the scanning period of the C zone.

Here, the output waveform of the detection element is a of the A zone.
The waveform is shown when there is one person in section b and two people in section b of zone B. As shown in the figure, when two people are in close proximity, the output of the detection element is approximately 2h, which is approximately twice as large as h when there is only one person, so it is necessary to set an appropriate threshold value. It is possible to determine whether there are people present or not, and to determine whether there are one person or two people, and furthermore, by performing an AND with each of the synchronization signals, a signal corresponding to the number of people in each section can be obtained.

In this way, by using the situation monitoring device described above, it is possible to detect the number and position of passengers in the car. When a car is present in close proximity, security operations such as issuing an alarm or stopping the car at the nearest floor may be considered.

By the way, in the above-mentioned situation monitoring device, when one person is standing astride the boundary between zones, there are cases where it is mistakenly detected as two people. For example, if one person stands on the boundary between A zone and B zone, A
One person was detected when the zone was scanned and one person was detected when the B zone was scanned, ie, two people in total were detected, which caused a problem in terms of detection accuracy.

[Means for solving problems]

The present invention has been made to solve the above-mentioned problems, and each of the above-mentioned zones is set as a main zone, and new auxiliary zones are provided within each main zone, and the adjacent main zones are placed in the same row (sections). By providing an adjacent zone overlap detection circuit that detects the presence of a person in the main zone, normally detection is performed only in the main zone, but when the adjacent zone overlap detection circuit detects the presence of a person near the boundary of the main zone. performs detection in both the main zone and the auxiliary zone, and detects only one person near the main zone boundary.
This allows accurate discrimination between one person or two people.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings. In the following figures, the same parts as in FIGS. 1 to 4 are indicated by the same reference numerals.

FIG. 5 is a view corresponding to FIG.
Separately from LC, auxiliary zone slits LA' to LC' having approximately half the width are provided.

FIG. 6 is a plan view of the inside of the car to show the relationship between the main zone and the auxiliary zone. The auxiliary zones A' to C' are set within each main zone A to C with approximately half the width.

FIG. 7 is a block diagram showing an embodiment of the overall configuration of the present invention. In the figure, 10 is an infrared sensing element for the auxiliary zone provided in the case 2, and 15 is an infrared sensing element for the main zone. , 11 is a preamplifier for the auxiliary zone, 16 is a preamplifier for the main zone, 12 is a bandpass filter for the auxiliary zone for removing noise components, etc., and 17 is a bandpass filter for the main zone. , 13 is a comparator for the auxiliary zone, 18 is a comparator for the main zone, 14 is a memory circuit for the auxiliary zone, 19 is a memory circuit for the main zone, 20 is a photo interrupter, and 21 is the hall in FIG. A synchronizing signal circuit 22 outputs a synchronizing signal for the main zone, and inputs the signal from the main zone storage circuit 19, and inputs the signal from the main zone storage circuit 19 to output the synchronizing signal for adjacent main zones in the same row, for example, section a of zone A and section a of zone B. location (section)
22a is a normally open contact that is closed by the operation of the adjacent zone overlap detection circuit, which is activated when the presence of a person is detected.
2b is a normally closed contact that opens when the adjacent zone overlap detection circuit operates, 23 is an AND circuit, and 24 is a normally closed contact that opens when the adjacent zone overlap detection circuit operates.
OR circuit, 25 is an output circuit.

8A and 8B show a plan view of the inside of the car for explaining the operation of the present invention, and A is a of the A zone.
B represents the case where there is one person M standing in each of the sections A and B in section A, and B represents the case where M is standing in section A astride both A zone and B zone. It shows.

Next, the operation will be explained.

The signal from the detection element 15 for the main zone passes through a preamplifier 16 and a bandpass filter 17, and then a comparator 18 detects the presence or absence of a person. On the other hand, the signal from the photo interrupter 20 is input by the synchronizing signal circuit 21 to the main zone storage circuit 19 as position information. The presence or absence of a person at each position of each main zone is stored in the main zone storage circuit based on the position information from the synchronization signal circuit 21 and the presence or absence information from the comparator 18. Similarly, the signal from the detection element 10 is input to the memory circuit 14 for the auxiliary zone via the comparator 13, and the position information is also input from the synchronization signal circuit 21. The presence or absence is memorized.

In a normal state, since the adjacent zone overlap detection circuit 22 is not operating, its normally open contact 2
2a is open, and the normally closed contact 22b is closed. Therefore, the presence or absence and position of a person in the auxiliary zone are not considered at all, and only information on the presence or absence and position of a person in the main zone is output to the output circuit via the OR circuit 24. It is output from 25.

Next, if there is one person M at position a in Zone A and Zone B in Figure 8A, or if there is a person M straddling Zone A and Zone B at position a in Figure 8B, The case where there are people in the same row in adjacent main zones will be explained. In this case, if only the main zone is detected, it will not be possible to distinguish between A and B, resulting in erroneous detection, so the present invention operates as follows.

First, the presence/absence and position of a person in the main zone stored in the storage circuit 19 is input to the adjacent zone overlap detection circuit 22, which detects whether or not there is a person in the same row position in the adjacent main zone. This can be easily detected, for example, by calculating the logical product of the signal corresponding to the position a in the A zone and the signal corresponding to the position a in the B zone. When the presence of a person is detected at the same position in the adjacent main zone as shown in FIG. 8 A or B, the adjacent zone overlap detection circuit 22
operates, its normally open contact 22a is closed, and its normally closed contact 22b is opened. Therefore, in this case, the storage circuit 14 for the auxiliary zone and the storage circuit 1 for the main zone
From 9, the logical product of the presence or absence of a person in the main zone and the presence or absence of a person in the auxiliary zone at that line position is AND
The signal is taken by the circuit 23 and outputted to the output circuit 25 via the OR circuit 24. In other words, in the case of Figure 8 A, the logical product of zone A, which is the main zone, and zone A', which is the auxiliary zone, at position a is AND.
It is taken in circuit 23, and then the logical product of B zone and B' and zone is taken, and as a result, it is determined that there are two people, one person each at position a of zone A and position a of zone B. The signal shown is output.

On the other hand, in the case of FIG. Because there are no people,
The AND circuit 23 outputs only the position a of the A zone and not the position a of the B zone, that is, it outputs a signal indicating that there is one person at the position a of the A zone.

〔Effect of the invention〕

According to the present invention, even when a person stands on the boundary between zones, it is possible to accurately detect the person without erroneously detecting the person, and it is highly effective in improving the detection accuracy.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the external appearance of the sensing section of the situation monitoring device, FIG. 2 is a partially enlarged view of FIG. 1, and FIG. 3 is a diagram showing the sensing section of the situation monitoring device attached to an elevator car. Fig. 4 is a diagram showing an example of the relationship between the scanning position for each zone and the waveform of the output signal of the detection element, Fig. 5 is a diagram showing the external appearance of the case of the situation monitoring device according to the present invention, and Fig. 6 is the main Floor plan of the inside of the car to show the relationship between the zone and the auxiliary zone, No. 7
The figure is a block diagram showing one embodiment of the overall configuration of the present invention, and FIG. 8 is a plan view of the inside of the car for explaining the operation of the present invention. 1... Sensing section, 2... Case, 3... Rotating plate,
4,10,15...detection element, 11,16...preamplifier, 12,17...bandpass filter,
13, 18... Comparator, 14, 19... Memory circuit, 20... Photo interrupter, 21...
synchronous signal circuit, 22...adjacent zone overlap detection circuit, 23...AND circuit, 24...OR circuit, 25...
...Output circuit, A~C...Main zone, A'~C'...
Auxiliary zone.

Claims (1)

[Claims] 1. A fixed slit for setting the field of view, a rotating plate that has a slit that intersects the fixed slit and rotates at a constant speed, and responds to changes in infrared rays incident through a pinhole formed at the intersection of both slits. The situation monitoring device is equipped with a pyroelectric infrared detection element that outputs a signal, and determines the number of people and positions within the field of view based on the output signal of the detection element. It is divided into auxiliary zones that overlap each main zone in width, and an infrared sensing element for the main zone and an infrared sensing element for the auxiliary zone are provided as the infrared sensing elements, and the infrared sensing elements of the adjacent main zones are arranged in the same manner. An adjacent zone overlap detection circuit is provided that operates when the presence of a person is detected at the position, and when the adjacent zone overlap detection circuit is inoperative, the number of people and the position within the field of view are determined from the output of the infrared detection element for the main zone. When the judgment is made and the adjacent zone overlap detection circuit operates, the number of people within the field of view is calculated by taking the logical product of the output of the infrared detection element for the main zone and the output of the infrared detection element for the auxiliary zone. A situation monitoring device characterized in that it is configured to determine a position.