JP4120475B2 - Security device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a crime prevention device that issues an alarm when an illegal intruder entering a building exterior such as a fence, fence, gate, or garage gate is detected.
[0002]
[Prior art]
Conventionally, as a crime prevention device of this type, in the opposite struts of the fence surrounding the house, an infrared detector projector is placed on one strut and a receiver is placed on the other strut at a position where there is no obstacle between the opposite struts. There is one that is designed to detect the intrusion of illegal intruders by blocking the infrared rays between the projector and the light receiver when an illegal intruder intrudes over the fence. Reference 1).
[0003]
[Patent Document 1]
JP-A-2-27072
[Problems to be solved by the invention]
However, there are many cases where there is planting on the indoor side of the building exterior such as a fence, and there is a case that the planting grows and misreports by invading the alert area. In addition, even if a small animal such as a bird or a cat invades, there may be a false alarm. In addition, when there is an obstacle such as planting in the alert area, there is a problem that the intruder cannot be alerted in the alert area.
[0005]
The present invention has been made in view of the above points, and provides a crime prevention device that can reliably detect illegal intruders by preventing false reports at the time of invasion of small animals such as planting and birds and cats. It is to be an issue.
[0006]
[Means for Solving the Problems]
The crime prevention device of the present invention for solving the above-mentioned problem is a crime prevention device for detecting an illegal intruder who enters over a building exterior, and a pair of distance measuring sensors are provided on the exterior of the building at a predetermined interval. The distance between the pair of distance sensors and the distance to the object that has entered the alert area is detected by each distance sensor, and the object width is calculated from the distance measured by the distance sensor. If the width of the door is equal to or greater than a certain width, it is determined that the intruder is an illegal intruder and a warning is issued.
[0007]
As described above, the width of the object is calculated based on the distance measured by the pair of distance measuring sensors, and when the object has a certain width or more that is considered to be a trespasser, it can be determined as a trespasser and a warning can be issued. Also, if the width of the object is a narrow width that cannot be considered by illegal intruders, it is determined that planting or small animals have invaded and no alarm is issued, and false alarms can be prevented. Accordingly, illegal intruders can reliably detect intrusions without any false alarms.
[0008]
It is also preferable that the intruding object is regarded as a fixed object when the intruding object stays in the alert area for a certain time or longer, and each distance measuring sensor thereafter warns the range up to the fixed object. In this case, even if an intruding object such as planting stays in the alert area, the intrusion of the object can be detected by alerting the range to the fixed object with each distance measuring sensor. As a result, illegal intruders can be detected even when a fixed object such as planting remains in the detection area.
[0009]
In addition, it is also preferable that a notification that prompts care is performed when the intruding object is regarded as a fixed object such as planting. It is possible to make the resident know that an obstacle such as planting has been invaded, and return to a predetermined alert state by performing care.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the example of the fence 1a as an example of the building exterior 1 will be described. As shown in FIG. 1, the fence 1a is supported by support pillars 2 standing at equal intervals, and sensor units 3 are provided at the upper ends of the support pillars 2 standing at equal intervals. . Thus, by providing the sensor unit 3 at the upper end of the support column 2, the sensor units 3 are arranged at equal intervals (for example, 2 m). Each sensor unit 3 is equipped with two distance measuring sensors arranged in the opposite directions. The detection distance of each distance measuring sensor is a length that can be detected when there is an intruder between adjacent sensor units 3. As described above, the sensor unit 3 is provided at the upper end of each support pillar 2 and the distance measuring sensor for detecting the opposite bidirectional direction is provided for each sensor unit 3 so that the entire area where the fence 1a is installed can be detected. It becomes.
[0011]
Each sensor unit 3 is equipped with a microcomputer 4, and each sensor unit 3 has a function of issuing an alarm or giving a notice for attention. The sensor units 3 and the sensor units 3 and the entire controller 5 are connected by a communication line 6. The communication line 6 is connected to each other by being passed through the support pillar 2 and embedded in the ground or through the side of the fence 1a.
[0012]
One of the pair of sensor units 3 that adjoin in FIG 1 and the sensor unit 3a, when the other as the sensor unit 3b, as indicated by arrow 3a ₁ whereas distance measuring sensors of the two distance measuring sensors in the sensor units 3a in other distance measuring sensor with the distance measuring out the light beam out of the light beam is ranging as arrow 3a _2, while the distance measuring sensor of the two distance measuring sensors in the sensor unit 3b in The distance is measured by emitting a light beam as indicated by the arrow 3b ₁ and the distance is measured by emitting the light beam as indicated by the arrow 3b _{2 by} the other distance measuring sensor, and the warning area between the sensor units 3 is alerted. Yes.
[0013]
When the intruding object 7 enters the upper part of the fence 1a between the adjacent sensor units 3a and 3b, the distance measuring sensors of the sensor units 3a and 3b measure the distance to the intruding object 7 as shown in FIGS. (The distance measurement distances of the distance measurement sensors of the adjacent sensor units 3a and 3b at this time are B and C). At this time, since the adjacent sensor units 3a and 3b are arranged at a constant interval A, the width W of the intruding object 7 is calculated as W = A−B−C. That is, the microcomputers 4a and 4b are mounted on the sensor units 3a and 3b, and the distance W between the adjacent sensor units 3a and 3b is communicated and calculated as described above, whereby the width W of the intruding object 7 is calculated. Calculated. If the width W is a certain dimension (for example, 40 cm) or more, it is determined that the person is a person, and if it is less than a certain dimension, it is determined that the person is not a person but a small animal such as a bird or a cat.
[0014]
If the width W of the intruding object 7 is determined to be a person with a certain size or more, it is regarded as an illegal intruder and an alarm such as an alarm sound or a warning light is emitted, and threatened or repelled. At the time of this alarm, all sensor units 3 may be notified by communicating with the controller 5. If it is determined that the width W of the intruding object 7 is equal to or less than a certain size and is not a person, a notification sound or a notification lamp is used to notify the householder of confirmation. Thus, if it is notified that an object such as planting has invaded, maintenance can be promoted. By detecting the width of the intruding object 7 as described above and determining whether or not it is an illegal intruder, an illegal intruder intrusion and an alarm are issued when a small animal such as a plant or a small animal such as a bird or a cat invades. Can prevent false alarms. Moreover, since it becomes possible for the householder to take care of the planting before the planting grows and misreports, the misreporting can be reduced and the reliability of crime prevention can be improved. In addition, since the size of the intruding object 7 can be determined by a relatively inexpensive distance measuring sensor without using a detection means such as image recognition, it is possible to realize malfunction prevention at a low price.
[0015]
In addition, when the distance A between the sensor units 3 differs depending on construction conditions or the like, initial learning is possible by measuring the distance between the adjacent sensor units 3 with a distance measuring sensor.
[0016]
Next, another example shown in FIGS. 3 and 4 will be described. One of the pair of sensor units 3 that adjoin in FIG 3 as a sensor unit 3a, when the other as the sensor unit 3b, as indicated by arrow 3a ₁ whereas distance measuring sensors of the two distance measuring sensors in the sensor units 3a in other distance measuring sensor with the distance measuring out the light beam out of the light beam is ranging as arrow 3a _2, while the distance measuring sensor of the two distance measuring sensors in the sensor unit 3b in The distance is measured by emitting a light beam as indicated by the arrow 3b ₁ and the distance is measured by emitting the light beam as indicated by the arrow 3b _{2 by} the other distance measuring sensor, and the warning area between the sensor units 3a and 3b is alerted. It has been broken. At this time, when there is an intruding object 7, it is determined whether or not it is an illegal intruder by calculating the width W of the intruding object 7 as described above. It also has such functions.
[0017]
Each sensor unit 3a, 3b always monitors the intruding object 7 by measuring the distance with a distance measuring sensor, and the detection distance value is set to a prescribed threshold value (same as the distance between sensor units, for example, 1.8 m). In the case of exceeding, it is determined that no intruding object 7 has entered. However, in the case of an intruding object 7 such as planting, it stays fixed in the invading state, and in this state, the intruding object 7 is always detected, and even if an illegal intruder invades in this state, it cannot be detected. Happens. Therefore, when the distance detected by the distance measuring sensor continues for a certain time (set to a time sufficiently longer than the time required for the intruder to enter, for example about 1 minute), the intruding object 7 is illegal. It is determined that the obstacle 7a is present instead of the intruder, and the subsequent recognition control of the illegal intruder is performed as follows. If the detection distance is a value sufficiently shorter than the distance X to the obstacle (X ₁ , X _{2 in} FIG. 4) (set in consideration of the width of the intruder, for example, X−0.4 m), the measurement is performed. It is recognized that there is an illegal intruder between the distance sensor and the obstacle 7a, and threats and repulses by sound, light, etc., notification to the home, etc. are performed. Thereby, even when an obstacle such as planting exists in the alert area, the illegal intruder can be reliably detected without overlooking the illegal intruder. When it is notified that there is an obstacle 7a and maintenance is promoted, the obstacle 7a is removed, and when the detection distance exceeds the threshold, the original control is restored.
[0018]
【The invention's effect】
The present invention calculates the width of an object based on the distance measured by a pair of distance measuring sensors as described above, and determines that the object is an illegal intruder and issues an alarm when the width is greater than a certain width that can be considered an illegal intruder. If the width of the object is too narrow for an illegal intruder, it can be judged as planting or small animal intrusion and no alarm is issued, and false alarms can be prevented. The person can also detect the intrusion with certainty. In addition, since it becomes possible for the householder to take care of the planting before the planting grows and misreports, it is possible to reduce the misreporting and improve the reliability of the security device. In addition, since the size of the intruding object can be determined by a relatively inexpensive distance measuring sensor without using a detection means such as image recognition, malfunction prevention can be realized at a low price.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view illustrating an example of the present invention.
FIG. 2 is a flowchart illustrating the control described above.
FIG. 3 is a schematic perspective view for explaining another example of the above.
FIG. 4 is a schematic perspective view for explaining another example of the above.
[Explanation of symbols]
1 Building exterior 1a Fence 2 Support pillar 3 Sensor unit

Claims (3)

In a security device that detects illegal intruders who cross over the building exterior, a pair of distance measuring sensors are arranged on the building exterior so as to face each other at a predetermined interval, and between the pair of distance measuring sensors. Each distance sensor detects the distance to the object that has entered the warning area and calculates the width of the object based on the distance measured by the distance sensor. A crime prevention device characterized in that a warning is issued upon determination. 2. The intrusion object is regarded as a fixed object when the intruding object stays in the alert area for a predetermined time or longer, and each distance measuring sensor thereafter warns the range to the fixed object. Security device. The crime prevention device according to claim 1 or 2, wherein when the intruding object is regarded as a fixed object such as planting, notification is made to prompt the user to perform maintenance.

Images