JP2006031323A - Device for determining direction of passing body and passing-body monitoring system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sensing device having the function of securely checking if a passing body has entered or exited, so that it can accurately determine the moving direction of the passing body and the directions in which the passing body moves in and out; and a passing-body monitoring system using the sensing device. <P>SOLUTION: The directions in which the passing body moves in and out are determined either by using a pair of sensing devices and a differential value between their outputs, the sensing devices providing electric outputs while responding in a monotonous manner to physical quantities inputted to a sensor that correspond to the moving in and out of the passing body, or by installing at least two or more pairs of sensing devices. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an entry / exit direction discriminating apparatus capable of accurately discriminating the entry / exit direction even for a passing object that has arrived slightly deviated, and a passing object monitoring system using the same.

    Conventionally, a passing body monitoring system has been used in various places such as a passageway, a building or an entrance of a room, and there are cases where it is necessary to determine the passing direction of the passing body. Such an example will be described with reference to FIGS. 5 and 6, for example. FIG. 6 is a block diagram of a conventional passing body monitoring system, which receives an output of an entrance / exit sensor 61 that detects entrance of a passing body, and stores the recognition stored in an IDTAG 65 recognition encoder 68 of the passing body. It has a function of reading a code by radio waves, determining whether the main controller 62 matches the registered recognition code in the recognition code registration memory 69, and outputting from the discrimination output unit 63 a signal permitting passage of only the matched passing body. Is.

Such an example can be seen in Patent Document 1 and Patent Document 2. The usage state is as shown in FIG. Returning to FIG. 6 again, the detailed operation will be described. When the passing body enters the detection area of the entrance / exit sensor 61, the output enters the main controller 62, drives the ID reading transceiver 64, and transmits the ID reading radio wave. The ID reading radio wave is received by the TAG side transmitter / receiver 66 of the IDTAG 65 possessed by the passing body, and the recognition code stored in the recognition encoder 68 is read out and transmitted from the TAG side transmitter / receiver 66 under the control of the sub controller 67. This is received by the ID reader / receiver 64, and the coincidence with the registration recognition code in the recognition code registration memory 69 is determined by the control of the main controller 62. If they match, the passage permission information is output from the discrimination output unit 63 to the passing body. If they do not match, the passage non-permission information is output.
JP-A-10-228589 JP 2000-293773 A

The use state of the above passing body monitoring system will be described with reference to FIG. There are generally five states of use, from 5-A to 5-E. First, an outline of the system will be described using 5-A. 61 is an entry / exit sensor, and its detection range is a region A indicated by a solid line, 64 is an ID reading transceiver, and its detection range is B indicated by a dotted line. In 5-A, the two detection ranges A and B coincide. In 5-B, range A is included in range B. In 5-C, range A is to the right and outside of range B. In 5-D, range A is to the left and outside of range B. In 5-E, the range B is included inside the range A. Each of these features is summarized in Table 1.
In Table 1, all of 5-A to 5-E are inconvenient: When the permitter and the disallower enter at the same time, the inventor can intrude. -178882 was submitted. The permitter enters the area on the left, returns without passing, and if an unauthorized person enters, it is possible to intrude. Three inconveniences of being able to enter when an unauthorized person enters from the left side are due to the fact that the passing body has not been accurately grasped. Therefore, in order to improve this, a single input / output sensor is insufficient, and at least two sensors are required. FIG. 3 shows a state of use of the passing body monitoring system in which two entrance / exit sensors are used.
FIG. 2 is a block diagram of a passing body monitoring system in which two entrance / exit sensors are used.

In FIG. 4, the contents are the same as those in FIG. 6 except that the input / output sensor 61 includes the first input / output sensor 41 </ b> A and the second input / output sensor 41 </ b> B. If an outline is demonstrated in the usage condition of 3-A in FIG. 3, in this example, it is the arrangement | positioning which the sensor has attached to the ceiling (upper side wall). The detection range of the first input / output sensor 41A is A indicated by a solid line, and similarly, the detection range of the second input / output sensor 41B is C indicated by a solid line, and the region B is the same as that described in FIG. In 3-B, the C region overlaps the B region. In 3-C, the A region also overlaps the B region. In 3-A, if two permitters enter from both the left side and the right side at the same time, the recognition code has not yet been read, so that it is mistaken as an unpermitted person. In the same case between 3-B and 3-C, there is no misperception as an unauthorized person. However, in any case, there is a problem in management because there remains a defect that the direction of each passing body cannot be recognized.

In view of the above-described conventional drawbacks, the present invention provides a passing body monitoring system that can accurately grasp the traveling direction of a passing body and has a function of checking whether it has entered and exited reliably.
Either determine the direction of passage of the passage from the pair of sensing elements that output the monotonic response to the physical quantity input to the sensor corresponding to the passage of the passage and the difference between the outputs. It is characterized in that at least two detection element pairs are installed so as to determine the exit / entry direction of the passing body.

The invention according to claim 1 is a passing / closing direction discriminating device for a passing body, wherein a pair of detecting elements for outputting an electric output corresponding to the magnitude of a signal input due to the entering / exiting of the passing body, and two outputs of the detecting element. It has a differentiator that takes a difference, and the exit / entry direction of the passing body is determined by the output of the differencer.

The invention according to claim 2 is an entry / exit direction discriminating device for a passing body, wherein there are at least two pairs of detection elements for outputting an electric output in response to signal input by the passage of the passing body, and two detection elements for each pair. It has a differentiator which takes an output difference, and distinguishes the entrance / exit direction of the passing body by the output of the differencer.

According to a third aspect of the present invention, in the apparatus for determining the direction of entry / exit of the passing body according to claim 1 or 2, the detection element has hysteresis in a response output characteristic to a position input by the entrance / exit of the passing body. It is characterized by.

According to a fourth aspect of the present invention, there is provided a passing body monitoring system comprising: a recognition encoder that stores a recognition code; a TAG side transceiver that transmits the recognition code; a subordinate that controls the recognition encoder and the TAG side transceiver. An IDTAG with a controller;
At least two or more entrance / exit sensors for determining the entry / exit of the passing body;
An ID reading transceiver for reading the recognition code transmitted from the TAG side transceiver;
A discrimination output unit for comparing the registered recognition code with the recognition code to produce an output that has been matched;
The recognition code registration memory for storing the registration recognition code in advance;
A main controller for controlling the access sensor and the ID reading transceiver;
The entrance / exit sensor includes a pair of detection elements that output an electrical output in response to a signal input due to the entry / exit of a passing body, and a difference unit that takes a difference between two outputs of the detection elements of each pair, and the difference unit The direction of the passing body is discriminated from the output of the passing body, and the passage of the passing body is monitored.

According to a fifth aspect of the present invention, in the passing body monitoring system according to the fourth aspect, the detection element has hysteresis in a response output characteristic to a position input due to the passage of the passing body.

Since it is comprised as mentioned above, in the passage direction discriminating device of this invention, since the passage direction of a passage body can be grasped | ascertained correctly, the improvement in the management precision of a passage body monitoring system can be aimed at.

As the best mode for carrying out the invention, a pair of sensing elements that give an electric output that responds monotonically to an input physical quantity to a sensor corresponding to the entry and exit of a passing body and the direction of passage of the passing body from the difference value of the output Or at least two pairs of sensing elements that produce an electrical output in response to an input physical quantity to the sensor corresponding to the passage of the passing body, and from the difference value of the output of each pair It is configured to determine the direction of passage of the passing body.
Embodiments will be described below.

FIG. 1 is a diagram showing an embodiment of a passing direction discriminating device for a passing body according to the present invention. The direction in which the passing body enters and exits is determined from a pair of sensing elements that output an electric output that responds monotonously to the physical quantity input to the sensor corresponding to the passage of the passing body and the difference between the outputs. In 1-A, the detection element pair 10 includes two detection elements 11A and 11B. Each of the detection elements 11A and 11B has a detection range of 12A and 12B, and when a passing body enters the range, it outputs an electrical output that responds monotonously to an input physical quantity corresponding to the passage of the passing body. Is. The meaning of having monotonicity here means that when a passing body enters, for example, in the case of using light, the transmitted or reflected signal depends on the magnitude of the increase or decrease of the input light to the sensor. Output. That is, by stopping the passing body, even if the intensity of the input light becomes constant, an output corresponding to the constant magnitude is output. As such a detection element, a photodiode, an ultrasonic element, a microwave receiver, a quantum infrared light receiving element, and the like are known. For example, when the passing body enters from the left side, it first enters the detection range 12A of 11A, so that the output of 11A is output, and then enters the detection range 12B of 11B, so that the output of 12B is output. If there is a width of the passing body, the output level is constant for a while. 1-B shows the time change of the outputs of 11A and 11B and the time change of the difference between both outputs by the differentiator 13. The outputs of 11A and 11B reach a certain value because the output of 11A first rises due to the penetration of the passing body from the left. After that, 11B changes similarly. As the difference, a pulse having a time width corresponding to the speed of the passing body and the distance between the detection elements is obtained. Of course, when a passing body enters from the right side, this pulse has a negative value. The direction of entering and exiting can be determined by determining the magnitude of this pulse. Since a pulse reaching a certain level can be obtained, even if there is only one sensor pair, it is easy to make a judgment at a high speed by using the sensing element having a fast response. In addition, since the size of a certain level area is used for the determination instead of the output response changing area, there is an advantage that there is no output fluctuation due to fluctuations in the position of the passing body. Since fluttering occurs when there is fluctuation due to slow movement of the passing body, it is advantageous to have fluttering resistance. The only disadvantage of the first embodiment is that when two passing bodies enter from the left side and the right side almost simultaneously, the outputs from both intersect and the direction of going in and out is unknown. That is, the direction of the person who entered first is known, but the person who entered later does not know whether it has passed or not.
In such a case, since each of the sensing element pairs is affected by transmission or reflection by the other two, an output difference is not obtained in a non-monotonic element such as a pyroelectric sensor that responds only to a changed portion. Since it becomes a complex waveform that is asymmetrical in the vertical direction, it is difficult to discriminate it. Such a situation is shown in FIG. FIG. 7 is a diagram for explaining an output response of a sensing element having no monotonicity. For this reason, in order to avoid such a thing, the thing using two or more pairs of detection elements is good. This will be described below with reference to FIG.

In FIG. 2, the direction of passage of the passing body is determined from at least two pairs of detection elements that output an electrical output in response to the physical quantity input to the sensor corresponding to the passage of the passing body and the difference value of each pair of the outputs. ing. The detection element pair 20A includes two detection elements 21A and 21B. Similarly, the detection element pair 20B includes two detection elements 21C and 21D. Of course, combinations of 21A and 21C and 21B and 21D pairs are also possible. Each of the detection elements 21A, 21B, 21C, and 21D has a detection range of 22A, 22B, 22C, and 22D, and when a passing body enters the range, the input physical quantity corresponding to the passage of the passing body is obtained. It provides an electrical output that responds. In the case of two or more pairs of sensing elements in this way, even if they come in almost simultaneously from the left side and the right side, which was the disadvantage of FIG. 1, it is ambiguous to judge one pair of sensing element pairs. Since the other pairs do not enter at the same time, there is an advantage that a correct judgment can be made. Since the output of the pair used for judgment can be ensured to be an output signal with the same passing body and merely having a time lag, there is no monotonicity like a pyroelectric sensor, that is, it corresponds to movement movement Even when outputting only the output, the signal output of the difference is not so complicated and can be used. Such a situation is shown in FIG. Of course, as described with reference to FIG. 1, the detection element having a monotonic characteristic is easier to process after taking the difference.
When there are two pairs of sensing elements, the speed of the passing body is obtained first on the side of the pair of sensing elements, so that the passing time at other sensing element pairs can be assumed from the result. If two or more pairs of detection elements in FIG. 2 are applied to a passing body monitoring system using IDTAG as shown in FIG.
The direction in which the passing body enters and exits is determined, which is very convenient. Reading of the IDTAG can be driven by a trigger at the output from the sensing element.

Giving hysteresis as a response characteristic to the input to the sensing elements constituting the sensing element pair in the example of FIGS. 1 and 2 is effective for signal fluctuations caused by passing objects. For example, it is effective in the case of a passing body that moves slowly or a passing body that has some fluctuation (for example, fluid).
Hysteresis is a response output corresponding to a certain position when inputting, but when returning (for example, due to fluctuations), it is not the same position, and electrical output is made so that output will not be output unless it returns greatly. Is to set the characteristics. Although not shown in the drawing, the sensing element pair can be installed on both sides of the passing body. In this case, another passing body parallel to the passing body can be detected without being shaded. In addition, the passing body used for description is not restricted to a human being or a living thing.
It refers to the general thing that moves.

The present invention can avoid the fact that the direction of passage of the passing body, which has been a defect of the prior art, can be avoided, and the passing body can be managed. Therefore, the present invention is extremely useful in fields such as crime prevention. .

It is a figure which shows one embodiment of the entrance / exit direction discrimination device of the passing body by this invention. It is a figure which shows another one embodiment of the entrance / exit direction discrimination | determination apparatus of the passing body by this invention. It is a figure explaining the use condition of the passing body monitoring system which two entrance / exit sensors used. It is a block diagram of the passing body monitoring system which two entrance / exit sensors used. It is a figure explaining the use condition of the conventional passing body monitoring system. It is a block diagram of the conventional passing body monitoring system. It is a figure explaining the output response in the sensing element without monotonicity.

Explanation of symbols

10, 20A, 20B Sensing element pair 11A, 11B 21A, 21B, 21C, 21D Sensing element 12A, 12B, 22A, 22B, 22C, 22D Sensing range 13, 23A, 23B Differentiator 41A Input / output sensor A
41B In / out sensor B
61 Input / output sensor 62 Main controller 63 Discriminating output device 64 ID reading transmitter / receiver 65 IDTAG
66 TAG side transceiver 67 Sub controller 68 Recognition encoder 69 Recognition code registration memory

Claims (5)

A pair of sensing elements that output an electrical output according to the magnitude of the signal input due to the entry and exit of the passing body, and a differentiator that takes the difference between the two outputs of the sensing element, and the output of the passing body An exit / entry direction discriminating device for a passing body characterized by discriminating an exit / exit direction. At least two pairs of detection elements that output an electric output in response to signal input due to the passage of a passing body, and a differencer that takes a difference between two outputs of the detection elements of each pair, and the passage by the output of the differencer An exit / entry direction discriminating device for a passing body, characterized by discriminating an entrance / exit direction of the body. 3. The passage entry / exit direction determination device according to claim 1, wherein the detection element has hysteresis in a response output characteristic to a position input by the entry / exit of the passage member. An IDTAG having a recognition encoder for storing a recognition code, a TAG side transceiver for transmitting the recognition code, a sub-controller for controlling the recognition encoder and the TAG side transceiver;
At least two or more entrance / exit sensors for determining the entry / exit of the passing body;
An ID reading transceiver for reading the recognition code transmitted from the TAG side transceiver;
A discrimination output unit for comparing the registered recognition code with the recognition code to produce an output that has been matched;
The recognition code registration memory for storing the registration recognition code in advance;
A main controller for controlling the access sensor and the ID reading transceiver;
The entrance / exit sensor includes a pair of detection elements that output an electrical output in response to a signal input due to the entry / exit of a passing body, and a difference unit that takes a difference between two outputs of the detection elements of each pair, and the difference unit The passing body monitoring system, wherein the passage direction of the passing body is determined by the output of the passing body and the passage of the passing body is monitored. 5. The passing body monitoring system according to claim 4, wherein the detection element has hysteresis in a response output characteristic to a position input due to the passage of the passing body.

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