JPH0833935B2 - Object detection device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an object detection device, and more particularly, to an improvement of an object detection device capable of self-detecting a device failure and suitable for, for example, an automatic ticket gate at a station.

<< Summary of the Invention >> The object detection device of the present invention detects one object at the same time in an object detection device including a detection element as a light receiving element that cannot detect a light blocking state when the detection element is out of order. A plurality of detection elements are provided as possible, and an abnormality determination means is provided to determine whether any one of the detection elements is abnormal when the plurality of detection elements cannot detect the light shielding state at the same time. Is configured to be self-detectable.

<< Prior Art and Its Problems >> Conventionally, as an object detection device of this type, a light-emitting and light-receiving element is arranged across a passage, and a passerby detects the passage by blocking light between the light-emitting / light-receiving element. The thing of a structure is general.

When the light emitting / light receiving element fails, the passerby cannot be detected. Therefore, as a method of self-detecting the failure of the light emitting / light receiving element, when the light blocking state between the light emitting / light receiving element continues for a certain time, The structure considered as the failure was adopted.

However, in the object detection device having such a configuration,
When the light emitting element on the light emitting side fails, the failure can be visually detected, but when the light receiving element fails, the light emitting state is maintained and the failure cannot be found. .

<Object of the Invention> The present invention has been made in order to solve such a conventional drawback, and on the premise that the light emitting unit is normal, a detection element as a light receiving element for detecting passage of an object fails. However, it is an object of the present invention to provide an object detection device capable of accurately detecting the failure.

<< Structure and Effect of the Invention >> In order to achieve such an object, the present invention provides an object detection device including a detection element that cannot detect a light-shielding state when the detection element is defective. Is normal, while arranging a plurality of the detection elements so that one object can be detected at the same time, and when the plurality of detection elements cannot detect the light shielding state at the same time, one of the detection elements is abnormal. An abnormality judging means for judging is provided.

The object detection device having such a configuration is provided with a plurality of detection elements capable of simultaneously detecting one object, and when all the detection elements cannot detect the light shielding state at the same time, it is determined that one of the detection elements is abnormal. Therefore, the abnormality of the light-receiving side detection element can be self-detected by the apparatus itself.

For this reason, it is possible to detect abnormalities in the detection element at an early stage and significantly shorten the maintenance time.

<< Description of Examples >> Examples of the present invention will be described below.

FIG. 1 and FIG. 2 are perspective views showing the appearance when the object detection device of the present invention is applied to an entrance / exit control gate device, and FIG. 2 is disassembled for convenience.

In the figure, the entrance / exit management gate device to which the present invention is applied is configured by arranging the entrance gate device 1 and the gate panel device 3 in parallel with each other with a space therebetween,
A passage 5 is provided between the introductory gate apparatus 1 and the gate panel apparatus 3.
Are formed.

In the upper part of the entrance side of the case 7 of the introductory gate apparatus 1,
A card insertion slot 9 for inserting a card such as a ticket or a commuter pass in which predetermined information is stored in advance is arranged, and a card reader unit 11 for reading the contents of the inserted card is continuous to the card insertion slot 9. The card take-out port 13 is connected to the card reader unit 11 so that the read cards can be taken out along the passage 5.

On the exit side of the introductory gate device 1, a door portion 15 for preventing an unauthorized person from passing is attached to the housing 7 so as to be openable and closable,
The passage 5 can be opened and closed by a predetermined control signal.

As shown in FIG. 2 (A), the case 7 of the introductory gate apparatus 1 is provided with an entrance side light emitting section 17, a center light emitting section 19, and an exit side light emitting section 21 at the entrance side, the central portion, and the exit side, respectively. It is arranged to emit light to the gate panel device 3 side.

Since the exit side light emitting section 21 is arranged inside the door section housing section of the housing 7, it is not visible in the figure.

In the gate panel device 3, as shown in FIG. 2 (B), from the entrance side light emitting part 17, the central light emitting part 19 and the exit side light emitting part 21 to the part of the housing 23 facing the passage 5. An inlet side light receiving section 25, a central light receiving section 27, and an outlet side light receiving section 29 for receiving the light are arranged.

At the entrance side, the central part, and the exit side, the passer passes through each of the entrance side light emitting / receiving parts 17, 25, the center light receiving / receiving parts 19, 27, and the exit side light receiving / receiving parts 21, 29 by blocking light. Person is detected.

Moreover, the entrance side light emitting / receiving parts 17, 25, the central light emitting / receiving parts 19, 27, and the exit side light emitting / receiving parts 21, 29 are arranged at intervals such that the passerby can simultaneously shield light, for example, at intervals of 10 cm, respectively in the passage direction. It is composed of two light emitting elements arranged side by side and two light receiving elements facing them (corresponding to the detecting elements in the claims), and a pair of two sensors I ₁ , I ₂ , I ₃ , I ₄ , I ₄ , I ₅ and I ₆ are formed (see FIG. 3).

Therefore, those sensors I ₁ and I ₂ , I ₃ and I ₄ ,
It is possible to determine the passing direction of a passerby by the light-shielding order in I ₅ and I ₆ . For convenience, the inlet side sensors I ₁ and I ₂ form an inlet side detection section C, the central sensors I ₃ and I ₄ form a central detection section D, and the outlet side sensors I ₅ and I ₆ further form an outlet side. It is assumed that the side detection unit E is formed.

As shown in FIG. 3, the entrance-side detector C, the central detector D, and the exit-side detector E are connected to a CPU 33, which constitutes a control means, via an interface 31.

This CPU 33 is connected to the host controller 3 via the interface 35.
7, connected to the card reader 11 and door 15,
According to a program stored in advance in the M39, the RAM 41 is used to perform a predetermined process, which will be described later, and the door unit 15 is opened and closed based on information from the card reader unit 11, for example.

The CPU 33 has a function of detecting the passing direction of a passerby from the detection results of the respective sensors I ₁ and I ₂ , I ₃ and I ₄ , I ₅ and I ₆ , a pass counter for counting the number of passers, and further described below. It has an abnormality counter having a function. In addition, the operation of the entrance / exit management gate apparatus of the present invention will be clarified by the following processing procedure.

The control means shown in FIG. 3 is housed in the entrance gate device 1 described above, for example.

FIG. 4 shows the operation of the entrance / exit management gate apparatus of the present invention, particularly the operation of the control means centering on the CPU 33.

When the light-projecting element on the light-projecting side fails, it is possible to easily detect the failure visually. Therefore, in the following description, among the sensors I _{1 to} I ₆ , the light-projecting element on the light-projecting side will be described. Is assumed to be normal, and the sensor abnormality means abnormality of the light receiving element (detection element) on the light receiving side.

When the entrance / exit control gate device operates and the passerby inserts the card in step 100, the information recorded in the inserted card is read in step 101 to determine whether the read data is proper or not. Ends with the door 15 closing the passage 5.

If step 101 is YES, the door part 15 is set in step 102.
Opening operation processing is performed, and at the next step 103, the entrance side,
It is determined whether or not the sensor inputs of the central and outlet side detection units C, D, and E have changed, that is, whether the sensor input has changed to the light-shielded state or the light-projected state. If there is a change in the input and the passerby goes through the passage to become YES, it is determined in step 104 whether the change in the sensor input is in the entrance side detection unit C portion.

If step 104 is YES, the process jumps to a subroutine, and in step 105 it is judged whether or not the passerby has completed passing through the entrance side detection section C, and if NO, the sensor I ₁ is changed in step 106. It is stored and returns to step 103, and monitoring is executed until there is no change in the sensor input. That is, when the passerby blocks the sensor I ₁ of the entrance side detection unit C and does not reach the sensor I ₂ , the change of the sensor I ₁ is stored.

Next, when the passerby further intrudes and shields the sensor I ₂ , the results of both step 103 and step 104 are YES, and the process proceeds to step 105. If the passerby has not completed passing through the entrance side detection unit C, the step is performed. When 105 is NO, the process returns to step 103 through step 106. In this case, the step
At 106, it is stored that both I ₁ and I ₂ are in the light-shielded state.

Next, when the sensor I ₁ changes to the translucent state while the sensor I ₂ is in the light-shielded state, steps 103 to 106 are processed,
Similarly, in step 106, the change state of the sensor I ₁ is stored.

When the passerby passes through the entrance-side detection section C and the sensor I _{2 and the} sensor I ₁ are in a light-transmitting state, YES is determined in step 105, and in step 107, the passer's passing direction is determined from the sensor change storage data described above. Processing is performed, and in step 108, an AND judgment is made as to whether or not both of the stored data relating to the sensors I ₁ and I ₂ are in the light-shielded state, and in the case of NO, it is not judged as passing and step 103 is executed again. Return to.

When step 108 is YES (when there is no failure in the sensors I ₁ and I ₂ ), it is determined in step 109 whether or not the passer is in the intruding direction.

If YES at step 109, "1" is added to the passage counter at step 110 and the process returns to step 103,
If step 109 is NO, "-1" is added to the passage counter in step 111 and the process returns to step 103.

Next, when the passerby reaches the central detection unit D and the exit side detection unit E, the passerby detects the sensor in step 112 or step 113.
It is determined whether or not I ₃ and the sensor I ₅ are shielded from light, and if YES, the process proceeds to step 105, and as in the case of passing through the entrance side detection unit C, step 103, step 113, step 112, step 105 to Step 111 is processed. At that time, step
At 106, the change content storing process of the sensor contents is performed. The sensors I ₃ and I ₅ are the sensors I ₁ , and the sensors I ₄ and I ₆ are the sensors.
Equivalent to I ₂ .

Subroutine from step 113 (steps 105-111)
After passing through, the process proceeds to step 114, but if it is determined in step 114 whether or not the content of the passage counter is equal to or less than "3", the passerby exits while the sensors I _{1 to} I ₆ are normal. When the detection section E is passed, the content of the passage counter becomes "3", so that the result is YES and "-3" is added in the next step 115, and the content of the abnormality counter is cleared in the following step 116. finish. When there are two or more passers in the passage, the content of the pass counter may be "3" or more.

If even one of the sensors I _{1 to} I ₆ is defective,
The fault sensor always emits light, and step 108 returns N.
It becomes O, the passage counter becomes "2" or less, and step 1
14 becomes NO.

If NO in step 114, "1" is added to the content of the abnormality counter in step 117, and it is determined in step 118 whether the content of the abnormality counter is equal to "2".
If step 118 is NO, the process ends as it is, and if YES is determined in step 119, it is determined that the sensor is abnormal, and the abnormality display process is executed and the process ends.

That is, if the content of the passage counter is "3" or more after the next passerby passes through the exit side detection unit E, the content of the abnormality counter is cleared, but the content of the abnormality counter is "2" or less again. Then, "1" is added to the content to become "2", and an abnormality determination is made through steps 118 and 119.

As described above, in the entrance / exit management gate device of the present invention, in each of the detection means arranged in the device, the detection element that constitutes the detection device is detected by the AND condition whether or not both passers-by are blocked by the passerby. Since the abnormality of the element is detected, the failure of the detecting means due to the failure of the light receiving side element as well as the light emitting side can be self-detected.

[Brief description of drawings]

1 and 2 are perspective views showing the appearance of an entrance / exit control gate apparatus to which the present invention is applied, FIG. 3 is a block diagram showing the control means of the present invention, and FIG. 4 is the control means of FIG. 3 is a flowchart mainly showing the operation of FIG. 1 …… Introductory gate device 3 …… Gate panel device 5 …… Aisle 7,23 …… Case 9 …… Card insertion slot 11 …… Card reader 13 …… Card exit 15 …… Door 17,25… … Entrance side emitting / receiving section 19,27 …… Central emitting / receiving section 21,29 …… Exit side emitting / receiving section 33 …… CPU 39 …… ROM 41 …… RAM C …… Inlet side detecting section D …… Center detecting section E: Exit side detector

Claims (1)

[Claims] 1. An object detection device equipped with a detection element that cannot detect a light-shielded state when the detection element is out of order. When the light-emitting section is normal, one object can be detected at the same time. An object detection device comprising a plurality of elements, and an abnormality determination means for determining whether any one of the detection elements is abnormal when the plurality of detection elements cannot detect the light shielding state at the same time. apparatus.