JP3603271B2 - Infrared security device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an infrared security device for detecting an intruder in a specific area, for example.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, an infrared security device has been known as a security device for detecting an intruder in a specific area such as a building.
Such an infrared security device is generally configured by laying a detection line including a pair of an infrared light emitting unit and an infrared light receiving unit around a building or the like where an intruder is to be detected.
When an intruder attempts to enter a building or the like, a part of the intruder's body crosses the detection line, so that infrared light from the infrared light emitting unit does not enter the infrared light receiving unit, and detection from the infrared light receiving unit is performed. The signal changes. The presence of an intruder can be detected by detecting a change in the detection signal from the infrared light receiving unit by the signal processing unit. Based on the detection by the signal processing unit, for example, an alarm device or the like is activated, whereby the presence of the intruder is indicated as a warning sound or a warning display, or is notified to a security department or a security company. Become.
[0003]
[Problems to be solved by the invention]
By the way, the infrared security device having the above-described configuration is usually disposed at a certain height from the ground with respect to a building or the like, whereby an approach of an intruder to the building or the like is detected. However, in an area where there is snow in winter, the height of the security device from the snow surface becomes relatively low due to the snow.
Therefore, an intruder can easily straddle the detection line by the security device, and in some cases, the security device itself is buried in the snow due to snow. As a result, there has been a problem that detection of an intruder becomes substantially impossible.
[0004]
For this reason, in such snowy regions, the infrared security device is arranged at a position slightly higher than a normal height in consideration of the amount of snow in winter. However, in this case, since the height of the detection line is relatively high, an intruder can pass through the detection line, and the intruder cannot be reliably detected. Was. Such a problem is the same not only in the case of snow cover but also in a case where detection must be performed in an area where weeds grow, for example.
[0005]
In view of the above, an object of the present invention is to provide an infrared security device capable of reliably detecting an intruder even in a snowy region or other specific area.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the infrared security device of the present invention according to claim 1 forms detection lines at a plurality of height positions from the ground along the periphery of an area where an intruder is to be detected, Infrared light emitting unit and infrared light receiving unit respectively provided at both ends of the detection line, and a control unit that sends an alarm when an intruder is detected based on the level of infrared light received from the infrared light emitting unit received by the infrared light receiving unit In the infrared security device including the above, when the light receiving level of the infrared light from the infrared light emitting unit received by the infrared light receiving unit is continuously below the reference level for a certain time or more, the control unit cuts off with snow or weeds It is determined to be, determine whether it has been blocked by snow or weeds only the lowermost sensing line among the sensing line which is not judged to have been blocked by snow or weeds And it is adapted to stop the delivery of the alarm.
[0007]
According to the infrared security device of the second aspect, when the control unit determines that all the detection lines have been blocked by snow or weeds, the control unit determines that the detection of the intruder has been disabled and cannot perform the detection. It is designed to output a signal.
[0009]
According to the infrared security device of the third aspect , the control unit interrupts the plurality of detection lines within a preset time and continuously interrupts the plurality of detection lines for a predetermined time or more. It is designed to output an alarm at times.
[0010]
According to the above configuration, at the time of non-snow, the control unit performs detection of the intruder based on the detection signals from the respective infrared light receiving units by using the detection lines at all the height positions. When a part of the intruder's body is cut off, the presence of the intruder is detected based on a change in the detection signal of the infrared light receiving section of the detection line, and an alarm signal is issued.
[0011]
On the other hand, in the case of snow or when weeds are overgrown, the control unit determines the cutoff time of the detection line and the light reception of the infrared light receiving unit based on the detection signal from the infrared light receiving unit at each height position. By the amount or the like, it is determined that the detection line is in the snow or in the weeds, and the detection signal from the infrared light receiving unit of the detection line is excluded, and only the detection signal from the other infrared light receiving unit is used. Perform intruder detection. Thus, the intruder can be detected until the highest detection line is buried in the snow or weeds.
[0012]
Further, when all of the detection lines are blocked by snow or the like, a detection impossible signal is output from the control unit, so that it is possible to know that the intruder cannot be detected.
Further, since the blocking of the detection line due to snow etc. is blocked in order from the bottom detection line, the control unit does not need to determine whether all the detection lines are blocked by snow or weeds, It is also possible to make a determination only on the lowest detection line among the detection lines that have been determined not to be interrupted by snow or the like.
[0013]
In addition, when the detection lines are cut off due to snow or weed growth, the detection lines are not cut off at substantially the same time. If the detection line is interrupted and the detection line is interrupted continuously for a predetermined time or longer, it is determined that the detection line is not caused by snow or the like but by an obstacle, and an alarm is output. Thereby, the interruption of the detection line by the obstacle can be detected separately from the interruption by the intruder or the snow weed.
Therefore, even during the growth of snow and weeds, the intruder is reliably detected, and the detection signal from the infrared receiver of each detection line is used to detect snow and the like. There is no need to provide a snow sensor or the like, and the device is configured at a relatively low cost.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.
FIG. 1 shows an embodiment of an infrared detection device according to the present invention.
In FIG. 1, the infrared security device 10 forms detection lines 11, 12, 13, and 14 extending in parallel with each other at a plurality of height positions from the ground along the periphery of an area where an intruder is to be detected. In addition, the infrared light emitting units 11a, 12a, 13a, 14a and the infrared light receiving units 11b, 12b, 13b, 14b provided at both ends of each detection line and the detection from the infrared light receiving units 11b, 12b, 13b, 14b, respectively. The control unit 15 includes a control unit 15 to which a signal is input, and an alarm device 16 that issues an alarm based on a control signal from the control unit 15.
[0015]
Each of the detection lines 11, 12, 13, and 14 is an infrared beam sensor having a known configuration, and an infrared beam emitted from each of the infrared light emitting units 11a, 12a, 13a, and 14a is transmitted to a corresponding infrared light receiving unit 11b, 12b. , 13b, and 14b, the detection lines 11, 12, 13, and 14 are formed by infrared beams.
Then, for example, when a part of the intruder's body cuts off the detection line, the detection signal of the infrared light receiving portion 11b, 12b, 13b or 14b of the detection line 11, 12, 13 or 14 changes, and The presence of an intruder is detected.
[0016]
The control unit 15 receives the detection signals from the infrared light receiving units 11b, 12b, 13b, and 14b of the detection lines 11, 12, 13, and 14, and performs detection of an intruder and determination of snow with respect to each detection signal. Is supposed to do it.
[0017]
First, detection of an intruder is performed as shown in FIG.
The detection signals from the infrared light receiving units 11b, 12b, 13b, and 14b, that is, the sensor inputs are normally at a low level as shown in the uppermost row in FIG. 2, and the detection lines 11, 12, 13, and 14 are cut off. When it is, it changes to a high level.
[0018]
On the other hand, the control unit 15 has a built-in timer function, and the timer operates only for a predetermined time set before the sensor input changes to a high level. Then, when the sensor input returns to the low level again within the predetermined time of this timer (that is, when the cutoff of the detection line is completed and the infrared rays are again incident on the infrared light receiving units 11b, 12b, 13b, and 14b), The control unit 15 detects that an intruder is present, and sends a control signal to the alarm device 16. Thus, the alarm device 16 issues an intrusion alarm as shown in FIG.
[0019]
The intrusion alarm is, for example, an alarm sound such as a siren or a warning display such as irradiation of a spotlight, or may be an alarm signal to a security department or a security company.
[0020]
The detection of snow and weeds is performed as shown in FIG. Hereinafter, a case of snow cover will be described as an example.
That is, the detection signals from the infrared light receiving units 11b, 12b, 13b, and 14b, that is, the sensor inputs are normally at a low level as shown in the uppermost row in FIG. When it is cut off by snow, it changes to a high level.
[0021]
On the other hand, the control unit 15 has a built-in timer function, and the timer operates for a predetermined time set before the sensor input changes to a high level. If the sensor input remains at the high level continuously during the operation of the timer, the control unit 15 determines that the interruption is due to snow and sends a control signal to the [detection line] alarm device 16. I do.
[0022]
The infrared security device 10 according to the present invention is configured as described above. When no snow is present, the detection lines 11, 12, 13, and 14 of the security device 10 are cut off by a part of the intruder's body. Since the detection signals of the infrared light receiving units 11b, 12b, 13b, and 14b change to the high level, the control unit 15 determines that the intrusion has occurred when the high-level time of the detection signals is shorter than the predetermined time set by the timer. The presence of a person is detected and a control signal is sent to the alarm device 16 to operate the alarm device 16.
[0023]
Here, at the time of snowfall, when the detection lines 11, 12, 13, and 14 are buried in the snow due to the snowfall, the detection signals from the infrared light receiving units 11b, 12b, 13b, and 14b of the detection lines 11, 12, 13, and 14 become Since the high-level time of the detection signal is longer than the predetermined time set by the timer, the control unit 15 determines that the detection signal is buried in the snow and detects the intruder. Switch not to use for detection.
[0024]
For example, as shown in FIG. 1, when only the detection line 11 is buried in snow due to snow, the control unit 15 keeps the detection signal from the infrared light receiving unit 11 b of the detection line 11 at the high level. Accordingly, it is determined that the detection line 11 is in the snow, and the detection line 11 is switched so as not to be used for detecting an intruder.
[0025]
Thus, the control unit 15 detects an intruder by using only the detection lines 12, 13, and 14.
In this way, the infrared security device 10 allows the intrusion by the detection line 14 alone, even if the other detection lines 11, 12, and 13 are buried in the snow due to the snow, leaving the detection line 14 at the highest position. Can be detected.
When all the detection lines 11, 12, 13, and 14 are buried in the snow due to snow, the detection signals from the infrared light receiving units 11b, 12b, 13b, and 14b of the detection lines 11, 12, 13, and 14 are , All remain at a high level, so that the control unit 15 may output an undetectable signal to the alarm device 16.
[0026]
Further, since snow can be determined by a simple configuration based on the detection signals of the infrared light receiving units 11b, 12b, 13b, and 14b of the detection lines 11, 12, 13, and 14, a separate snow sensor is prepared. No need.
[0027]
In the above-described embodiment, the control unit 15 determines the detection lines 11, 12 due to the snow based on the detection signals from the infrared light receiving units 11 b, 12 b, 13 b, 14 b of the detection lines 11, 12, 13, 14. , 13, and 14 are compared with a predetermined time of a timer set in advance to determine snow cover. However, the present invention is not limited to this, and the infrared light receiving units 11b, 12b, and It is apparent that the detection of the snow cover may be performed by comparing the detection signal with a reference level based on the change in the amount of received light due to the snow cover of 13b and 14b.
In this case, an infrared beam sensor consisting of an infrared light emitting unit and an infrared light receiving unit is used to measure the decrease in the amount of received light due to contamination of the cover or deterioration of the sensor performance, etc. If a sensor that sends a signal indicating deterioration of the environment is used, the control unit 15 does not need to determine snow cover.
[0028]
In the above-described embodiment, only the interruption of the detection line due to the snow is mainly described. However, the interruption of the detection line due to the growth of weeds as well as the snow can be similarly detected.
[0029]
FIG. 4 is an operation flowchart of the control unit of the security device of FIG.
To restate according to this flowchart, first, if there is a new sensor input, the timer makes a determination, and if less than a predetermined time set in advance, it is determined that there is an intruder and the intruder detection that activates the alarm device Processing is performed.
If the time is longer than a predetermined time, it is determined that snow is present, and snow detection processing is performed to exclude the detected sensor from security.
Next, it is determined whether or not the sensor excluded from security is the detection line 14 arranged at the uppermost stage. If the sensor is at the uppermost stage, security disable processing is performed.
In addition, in cases other than the top row, it is determined whether or not the detection line of the sensor excluded from the security maintains the state of being blocked by snow, and a snow melting state is set, and the snow that blocks the detection line is removed. If it is detected, it is determined whether or not the sensor is the uppermost one of the sensors excluded from security.
In the case other than the uppermost stage, an abnormal operation process is performed. In the case of the uppermost stage, a snowmelt detection process of returning the sensor to security is performed.
[0030]
【The invention's effect】
As described above, according to the present invention, at the time of non-snowfall, the control unit performs detection of an intruder based on a detection signal from each infrared light receiving unit using the detection lines at all height positions, When a part of the intruder's body blocks any of the detection lines, the presence of the intruder is detected based on a change in the detection signal of the infrared light receiving section of the detection line, and an alarm signal is issued.
On the other hand, at the time of snow, the control unit determines that the detection line is in the snow due to the interruption time of the detection line, the amount of light received by the infrared light receiving unit, and the like based on the detection signal from the infrared light receiving unit at each height position. Then, the detection signal from the infrared light receiving portion of the detection line is excluded, and the intruder is detected only by the detection signal from another infrared light receiving portion. Thus, the intruder can be detected until the highest detection line is buried in the snow.
Therefore, even during snowfall, detection of an intruder can be reliably performed, and detection of snowfall is performed by using a detection signal from the infrared light receiving unit of each detection line. There is no need to provide it, and it can be configured at a relatively low cost.
[0031]
Further, when all of the detection lines are blocked by snow, the detection unit outputs an undetectable signal, so that it is possible to know that the intruder cannot be detected.
Further, since the detection lines are blocked in order from the lowest detection line due to snow, the control unit does not need to determine whether or not all the detection lines have been blocked by snow. The determination can be made only by the lowermost line among the detection lines determined not to be performed.
In addition, when the detection line is interrupted due to snowfall, the plurality of detection lines are not interrupted almost at the same time, so the control unit determines that the plurality of detection lines are interrupted at a time interval shorter than a predetermined time interval. If the detection line is interrupted and the detection line is interrupted continuously for a predetermined time or longer, it is determined that the detection line is caused not by snow but by an obstacle and an alarm is output. Thereby, the interruption of the detection line by the obstacle can be detected separately from the interruption by the intruder or the snow.
In addition, the present invention is not limited to the case of snow cover, and can detect an obstacle in an area where weeds grow, for example, in distinction from the case of interception due to the growth of weeds.
Thus, according to the present invention, there is provided an extremely excellent infrared security device capable of reliably detecting an intruder even in a snowy region or due to the growth of weeds.
[Brief description of the drawings]
FIG. 1 is a schematic view showing an embodiment of an infrared security device according to the present invention.
FIG. 2 is a time chart showing normal intruder detection in a control unit of the security device of FIG. 1;
FIG. 3 is a time chart showing a determination at the time of snow in a control unit of the security device of FIG. 1;
[Explanation of symbols]
FIG. 4 is an operation flowchart of a control unit of the security device of FIG. 1;
[Explanation of symbols]
Reference Signs List 10 infrared security devices 11, 12, 13, 14 detection lines 11a, 12a, 13a, 14a infrared light emitting units 11b, 12b, 13b, 14b infrared light receiving unit 15 control unit 16 alarm device

Claims (3)

An infrared light emitting unit and an infrared light receiving unit disposed at both ends of the detection line so as to form a detection line at a plurality of height positions from the ground along the periphery of the area where the intruder is to be detected; And a control unit that sends an alarm when an intruder is detected based on the level of infrared light received from the infrared light emitting unit received by the unit.
Top Symbol control unit,
If the received light level of the infrared light from the infrared light emitting unit received by the infrared light receiving unit is continuously below the reference level for a certain period of time or more, it is determined that the infrared light is cut off by snow or weeds,
Infrared crime prevention , which determines whether or not only the lowermost detection line among the detection lines that have not been determined to be interrupted by snow or weeds has been interrupted by snow or weeds, and stops sending out an alarm. apparatus. 2. The control unit according to claim 1, wherein when it is determined that all of the detection lines have been blocked by snow or weeds, the control unit determines that detection of an intruder has become impossible and outputs a detection impossible signal. Infrared security device. The control unit outputs an alarm when a plurality of detection lines are interrupted within a preset time and when the plurality of detection lines are interrupted continuously for a predetermined time or more. 3. The infrared security device according to 1 or 2 .

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