JP2006048416A5 - - Google Patents

Description

Monitoring device

  The present invention relates to a surveillance device for crime prevention and a method for arranging the same.

  In this type of conventional monitoring device, a cable-like vibration detection sensor is provided on a fence or the like, and when the fence is vibrated due to intrusion or the like, the cable-like vibration detection sensor provided on the fence is used. There is known an intrusion protection fence in which an intrusion can be detected by applying an external force such as vibration or impact (see, for example, Patent Document 1).

FIG. 8 shows a conventional protective fence described in Patent Document 1. In FIG. As shown in FIG. 8, an intrusion sensor sensing cable 22 for detecting an intrusion is wired to an intrusion protection fence 31 disposed along the periphery of a predetermined area. Then, one end of the sensing cable 22 is led to the control box 23 in the vicinity of the fence 31 through the connection pipe 41 embedded in the ground, and the other end is connected to the terminator 24 provided on the support column 32. When an intruder climbs the fence 31 or applies an impact, the vibration and impact applied to the fence 31 are sensed through the cable 22.
Japanese Unexamined Patent Publication No. 1-6478

  However, in the conventional configuration, since vibration is detected by one sensing cable of the intrusion sensor, it is difficult to specify the intrusion location, or even when vibration is detected due to natural phenomena such as rain or wind. There was a problem of judging.

  In the present invention, in order to solve the above-described conventional problems, when a monitoring device is provided on a fence or the like, it is possible to specify an intrusion place, and further, when a vibration is detected by an intrusion sensor, rain or It is an object of the present invention to provide a monitoring device that can determine whether the detection is due to the influence of wind or the like or the detection due to intrusion, and does not cause erroneous detection.

  In order to solve the above-described conventional problems, a monitoring device according to the present invention includes a flexible cable-shaped piezoelectric sensor and a determination unit that detects pressure and vibration of an object based on an output signal from the piezoelectric sensor. A plurality of piezoelectric sensor terminals are provided, and a piezoelectric sensor terminal is attached to a fence formed by connecting a plurality of fence members provided around a house for each single fence member of the fence. By attaching a piezoelectric sensor terminal to each single fence member, the state of each fence member is distinguished and detected, so intrusion from which location depends on which sensor in the entire fence outputs the detection signal It becomes possible to specify.

  Since the monitoring apparatus of the present invention is provided with a cable-like piezoelectric sensor for detecting intrusion for each single fence, the intrusion location can be specified. Therefore, it is possible to intimidate an appropriate place by specifying the intrusion place. It can also be used for future monitoring, such as strengthening monitoring of places where intrusions have occurred. In addition, it is possible to determine whether it is sensor detection due to the influence of rain or wind or sensor detection due to intrusion from output signals from a plurality of cable-shaped piezoelectric sensors, so there is no false detection, The monitoring device can be used with peace of mind for the user.

A first invention includes a plurality of piezoelectric sensor terminals each having a flexible cable-shaped piezoelectric sensor and a determination unit that detects pressing and vibration of an object based on an output signal from the piezoelectric sensor. The plurality of piezoelectric sensor terminals are attached to a fence formed by connecting a plurality of fence members provided around the fence, with the connection portions of the fence connected by vibration propagation members. Therefore, the number of piezoelectric sensor terminals to be arranged can be reduced by connecting the fences adjacent to each other with a vibration propagation member and arranging the piezoelectric sensor terminals on a single fence at a predetermined interval. Can do. Therefore, the installation cost is low.

According to a second aspect of the invention, in particular, in the first aspect of the invention, a case is provided that covers a determination means, and the cover also serves as a vibration propagation member. Therefore, by using the vibration propagation member in the case of the piezoelectric sensor terminal, the piezoelectric sensor terminal itself also serves as the vibration propagation member, so that it is easy to continuously provide a fence to which the piezoelectric sensor terminal is attached.

According to a third aspect of the present invention, there is provided a piezoelectric sensor terminal comprising a plurality of flexible cable-shaped piezoelectric sensors and one determination means for detecting pressure and vibration of an object based on output signals from the plurality of piezoelectric sensors. One or more units are provided, and the piezoelectric sensor is attached to each single fence member or at an interval of a fence formed by connecting a plurality of fence members provided around a house. . Therefore, since it is possible to detect the pressure and vibration at the location where the piezoelectric sensor is disposed with one determination means for detecting pressure and vibration, the cost is reduced.

According to the fourth aspect of the present invention, when an intrusion determining means is provided, when an output signal of a similar level is detected from a plurality of piezoelectric sensors, it is determined that the detection is due to a natural phenomenon such as rain, wind, or earthquake. Thus, it is possible to distinguish from detection due to intrusion, and it is possible to prevent erroneous detection.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
Fig.1 (a) is an internal block diagram of the piezoelectric sensor terminal of the monitoring apparatus in the 1st Embodiment of this invention. In the present embodiment, a case where it is arranged on a fence around a house will be described. Reference numeral 50 denotes an intrusion detection unit, which has a configuration in which a flexible piezoelectric sensor 63 is disposed on an elastic body 65 as shown in FIG. The piezoelectric sensor 63 generates an output signal corresponding to the deformation. The elastic body 65 is more flexible than the piezoelectric sensor 63 so that the intruder or the like gets over the fence and enters the house, so that the piezoelectric sensor 63 is easily deformed at the time of pressing or vibration when a hand or foot is put on the top of the fence. An elastic material such as rubber having flexibility and good flexibility is used, and since it is installed outdoors, it is selected in consideration of heat resistance and cold resistance. Specifically, it is preferable to select one that has a little decrease in flexibility at -30 ° C to 85 ° C. As such rubber, for example, ethylene propylene rubber (EPDM), chloroprene rubber (CR), butyl rubber (IIR), silicon rubber (Si), thermoplastic elastomer, etc. may be used. Further, the elastic body 65 is formed in a hollow shape and has a buffer portion 64 that can be compressed by pressing. Further, a groove for fixing and supporting the fence 66 is formed at the bottom of the elastic body 65. As a method of fixing to the upper part of the fence, it may be configured to fit into the upper part of the fence or a method of fixing with a tape or the like as long as it can be firmly fixed to the fence. Further, the arrangement position is not limited to the upper part of the fence as long as the position can detect vibration, such as the front part of the fence, not the upper part of the fence. Reference numeral 51 denotes a center electrode. 52 is an outer electrode. A sensor-side resistor 53 is provided as a resistor for detecting disconnection between the center electrode 51 and the outer electrode 52 at the end of the piezoelectric sensor 63. 54 is a circuit side resistor for detecting disconnection. Reference numeral 55 denotes a signal deriving resistor for deriving a signal from the piezoelectric sensor 63. A filtering unit 56 allows only a predetermined frequency component to pass from the output signal from the piezoelectric sensor 63. Reference numeral 57 denotes an abnormality determination unit that determines a disconnection abnormality from the piezoelectric sensor 63. Reference numeral 58 denotes a notification unit that sounds an alarm when an intrusion occurs or threatens an intruder by light notification. 59 is a battery. Reference numeral 60 denotes a terminal control unit. When the intrusion detection unit 50 detects pressure or vibration, the notification unit 58 performs control to threaten the intruder. When the abnormality determination unit 57 detects a disconnection abnormality, the notification unit 58 provides notification. 61 is a determination means, and 62 is a piezoelectric layer.

  2 is a cross-sectional view of the piezoelectric sensor 63 taken along line AA in FIG. In FIG. 2, 51 is a center electrode. 52 is an outer electrode. 62 is a piezoelectric layer. 67 is a coating layer.

  The center electrode 51 may be a normal metal single wire, but here, an electrode in which a metal coil is wound around an insulating polymer fiber is used. The insulating polymer fiber and the metal coil are each preferably a polyester fiber commercially used in electric blankets and a copper alloy containing 5 wt% silver.

  Generally, the piezoelectric layer 62 may be a resin-based polymer piezoelectric material such as polyvinylidene fluoride, but a composite piezoelectric material in which piezoelectric ceramic powder is mixed in a polymer base material such as chlorinated polyethylene. When used, the high temperature durability is improved.

  The outer electrode 52 has a configuration in which a belt-like electrode having a metal film bonded on a polymer layer is used and is wound around the piezoelectric layer 52. The electrode made of polyethylene terephthalate (PET) as the polymer layer and bonded with an aluminum film has high thermal stability at 120 ° C. and is also mass-produced commercially. 52 is preferred. In order to shield the piezoelectric sensor 63 from electrical noise in the external environment, the outer electrode 52 is preferably wound around the piezoelectric layer 62 so as to partially overlap.

  As the covering layer 67, an appropriate elastic polymer material such as urethane, polyethylene, or vinyl chloride is used.

  FIG. 3 shows a fence structure when the piezoelectric sensor terminal is arranged on the fence.

  In FIG. 3A, reference numeral 66 denotes a single fence. As for the fence around the house, a single fence 66 is arranged side by side on a block fence 69 as shown in FIG. Reference numeral 50 denotes an intrusion detection unit composed of a piezoelectric sensor 63, which is arranged for each single fence 66. Also, as shown in FIG. 3C, the intrusion detection unit 50 is flexible even when the fence upper part is curved or when there is no straight fence in the horizontal direction, so the shape of the fence makes the design easier. Even if it is important, the sensor can be arranged along the shape, and the degree of freedom of arrangement is improved without impairing the aesthetic appearance. Also, it can be arranged on a gate, etc., and as shown in FIG. 4 (a), it may be arranged on the upper part of the gate as in the case of a fence, or in FIG. 4 (b) so as to detect the opening of the gate. Thus, the intrusion detection unit 50 can be bent by opening and closing the gate, and can be arranged to detect the opening of the gate. 61 is a determination means, which is disposed on the fence surface on the house side.

  About the monitoring apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. The following explanation is an example of a fence installed around a house, but the same applies to other fences, for example, a fence structure in which a barbed wire is attached between a column and a column. It can be done. First, the fence surrounding the house is usually set up on a block fence 69 as shown in FIG. 3B, with a fence having a width of about 1 m like the single fence 66 shown in FIG. To go. Then, for each single fence 66, an intrusion detection unit 51 including a piezoelectric sensor 63 is disposed on the upper part of the fence. Next, when an intruder tries to sneak into the house and try to get over the fence, the intrusion detection unit 51 provided on the fence 66 is put on a hand or foot, and the piezoelectric sensor 63 is deformed, and the output signal is output. appear. And the control part 60 of the determination means 61 controls the alerting | reporting part 58, and threatens an intruder with a warning or light. In this way, by arranging the piezoelectric sensor terminal 70 for each fence 66, the invading place can be specified, so that when an alarm or the like occurs, it is possible to immediately go to the site and respond. In addition, an intimidating effect is also great because an alarm can be sounded at an intruder location for an intruder. However, in the structure where a single cable is used as the intrusion detection unit, the intrusion location cannot be specified, and even when an alarm is sounded, it may not sound near the intruder. The effect was small.

  Next, the procedure of disconnection determination in the abnormality determination unit 57 is shown below. In FIG. 1A, the resistance values of the sensor-side resistor 53, the circuit-side resistor 54, and the signal derivation resistor 55 are R1, R2, R3, and the voltage at the point P is Vp, and the voltage of the battery 59 is Vs. To do. R1, R2, and R3 usually have resistance values of several mega to several tens of mega ohms. When the electrode of the piezoelectric sensor 63 is normal, Vp is a partial pressure value of the parallel resistance of R2 and R3 and R1 with respect to Vs. Here, since the resistance value of the piezoelectric layer 62 is usually several hundreds of mega ohms or more, it hardly contributes to the parallel resistance values of R2 and R3, and is therefore ignored in the calculation of the partial pressure value. When the electrode of the piezoelectric sensor 63 is disconnected, the Pa point or the Pb point is equivalently opened, so that Vp becomes a partial pressure value of R2 and R3. When the electrode is short-circuited, equivalently, the Pa point and the Pb point are short-circuited, so that Vp is equal to Vs. As described above, the abnormality determination unit 57 detects an abnormality such as disconnection or short-circuit of the electrode of the piezoelectric sensor 63 based on the value of Vp, so that the reliability can be improved. In addition, when the disconnection as described above is performed, in the case of a single cable, all the arranged cables must be removed and replaced, but in this embodiment, the cables are arranged for each single fence. Therefore, only the disconnected piezoelectric sensor terminal 70 needs to be replaced, and the replacement work can be easily performed.

  In addition, referring to FIG. 5, by using the vibration propagation member 80, the piezoelectric sensor terminals 70 are not disposed in all the fences, but the same as in the case where the piezoelectric sensor terminals 70 are disposed for each fence. It is possible to obtain the effect. This is because a metal member having a good vibration transmission property is disposed between the single fence 66 and the adjacent fence, so that the intrusion is performed by the fence in which the piezoelectric sensor terminal 70 is not disposed. Even in this case, the vibration of the fence 66 is propagated when entering the fence in which the adjacent piezoelectric sensor terminal 70 is disposed, so that the entry can be detected. In FIG. 5, the vibration propagation member 80 is used. However, since the single fence 66 is installed side by side, it is considered that there is a minute gap between the fences. This is to facilitate transmission of vibration to other fences by using 80. In addition, by using a metal member with good vibration transmission for the case for covering the determination means 70, the case may be disposed between the fences as a vibration propagation member. In FIG. 5, the piezoelectric sensor terminals 70 are arranged every other fence. However, the present invention is not limited to this, and one or more piezoelectric sensor terminals can be opened if vibration is sufficiently propagated. A container 70 may be provided.

As described above, in the first embodiment, when there is an intrusion from a fence installed around the house, it is possible to identify the intrusion place and further threaten the intruder on the spot. Is possible. Also, the intrusion detection part of the piezoelectric sensor terminal may be arranged inside the fence, and by arranging it inside the fence, the trouble of arranging the piezoelectric sensor terminal can be saved. Is possible. Further, the piezoelectric sensor terminal may be provided with a data communication unit capable of wirelessly communicating with the central processing unit, and the central processing unit may control the start and release of the monitoring operation of the piezoelectric sensor terminal. In addition, since the central processing unit can receive output signals from detection from a plurality of piezoelectric sensor terminals, it is possible to prevent erroneous detection. As a method of preventing erroneous detection, the method of the second embodiment described below can be considered.

(Embodiment 2)
FIG. 6 is an internal block diagram of the piezoelectric sensor terminal of the monitoring device according to the second embodiment of the present invention. The difference from the piezoelectric sensor terminal according to the first embodiment is that it is provided with intrusion determination means 68 as shown in FIG. 6 and is detection by intrusion based on output signals from a plurality of intrusion detectors 50a, 50b, 50c. Determine whether the detection is due to natural phenomena such as wind or rain. FIG. 7 shows a fence structure when it is disposed on a fence. The difference from the arrangement of the first embodiment is that it is composed of a plurality of intrusion detection units 50a, 50b, 50c and one determination means 61.

  About the monitoring apparatus and fence structure which were comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, when the strong wind or heavy rain occurs when the four sides of the house are fenced, for example, when the intrusion detection units 50a, 50b, 50c are arranged on the fence on the north side and a strong wind blows from the north, Detection signals are output from the plurality of intrusion detection units 50a, 50b, 50c,... Disposed on the north fence. Therefore, the intrusion determination unit 68 determines that the detection is due to strong wind because output signals from the plurality of intrusion detection units of the intrusion detection units 50a, 50b, and 50c are generated. In the case of an intrusion, if an intruder tries to get over the fence and enter the house, and put his hands or feet on the upper part of the fence, the intruder is detected from one or a small number of intrusion detection units 50a arranged in the vicinity thereof. Since the detection signal is output, the intrusion determination unit 68 can determine that an intrusion has occurred. In the case of rain or an earthquake, detection signals are output from a plurality of intrusion detection units arranged in four directions, and the intrusion determination unit 68 can determine that the detection is due to heavy rain.

  In the present embodiment, the intrusion determination means 68 is provided in the determination means 61. However, when a monitoring device as in Embodiment 1 is installed, the output signals from each piezoelectric sensor terminal are integrated. If the control unit that performs the determination of the intrusion determination unit 68 is provided in the apparatus that automatically determines, the same effect as the present embodiment can be obtained.

  In addition, as a filtering characteristic, the frequency at the time of contact of a human hand due to intrusion or the like is 10 Hz or less, particularly in the range of 3 to 8 Hz, vibration due to rain is 10 Hz or more, and vibration due to wind is 1 Hz or less. As the filtering characteristics, it is possible to further improve the reliability by making the filtering unit 56 a band-pass filter that passes a signal component of 3 to 8 Hz, for example.

  As described above, in the second embodiment, detection due to natural phenomena such as wind and rain and detection due to intrusion can be determined, so that erroneous detection can be prevented. This improves the sense of security for the user.

  In addition, the monitoring device of the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the gist of the present invention.

  As described above, the monitoring device and its fence structure according to the present invention can identify the intruder's intrusion location by arranging a sensor terminal for each single fence, or natural phenomena such as rain and wind. It is possible to distinguish between sensor detection due to intrusion and sensor detection due to intrusion. For example, in the event of an intrusion, if there is a light or alarm near the intrusion, It can be threatened, and if it is detected by rain, it can also be applied to uses such as automatically placing the roof of a veranda where laundry is dried.

The internal block diagram of the piezoelectric sensor terminal in Embodiment 1 of this invention Sectional drawing of the piezoelectric sensor in Embodiment 1 of this invention The figure which shows the fence structure in Embodiment 1 of this invention The figure which shows the gate structure in Embodiment 1 of this invention The figure which shows another fence structure in Embodiment 1 of this invention The internal block diagram of the piezoelectric sensor terminal in Embodiment 2 of this invention The figure which shows the fence structure in Embodiment 2 of this invention Block diagram of a conventional monitoring device

Explanation of symbols

DESCRIPTION OF SYMBOLS 50 Intrusion detection part 51 Center electrode 52 Outer electrode 53 Sensor side resistor 54 Circuit side resistor 55 Signal derivation resistor 56 Filtering part 57 Abnormality judgment part 58 Notification part 59 Battery 60 Terminal control part 61 Determination means 62 Piezoelectric layer 63 Piezoelectric sensor 64 Buffer 65 Elastic body 66 Fence 67 Covering layer 68 Intrusion determining means 69 Block 70

Claims (4)

A plurality of piezoelectric sensor terminals each having a flexible cable-like piezoelectric sensor and a determination unit that detects pressing and vibration of an object based on an output signal from the piezoelectric sensor, and are provided around a house A monitoring device comprising: a plurality of piezoelectric sensor terminals attached to a fence formed by connecting a plurality of fence members at intervals with a connection portion of the fence connected by a vibration propagation member . The monitoring apparatus according to claim 1, further comprising a case that covers the determination unit, wherein the cover also serves as a vibration propagation member . One or a plurality of piezoelectric sensor terminals comprising a plurality of flexible cable-like piezoelectric sensors and one determination means for detecting pressure and vibration of an object based on output signals from the plurality of piezoelectric sensors. A monitoring apparatus comprising: a fence formed by connecting a plurality of fence members provided around a house; and the piezoelectric sensor is attached to each single fence member or at intervals . The monitoring apparatus according to claim 1, further comprising an intrusion determination unit that distinguishes between the presence / absence of intrusion and the occurrence of vibration due to a natural phenomenon such as wind and rain based on output signals of a plurality of piezoelectric sensors .