Intrusion detection device

Abstract

To provide an intrusion detection device that exhibits high durability and can detect intrusions with high accuracy. [Solution] The intrusion detection device comprises a positive electrode formed from electrodes having a matrix shape in which elongated electrodes intersect spaced apart at multiple intersections; a flat ground electrode made of a conductive flat plate, the flat plate being disposed opposite to the upper part of the positive electrode; a flat piezoelectric part stacked between the positive electrode and the ground electrode and generating a voltage when pressed by an external pressure; a current detection unit that detects a state of energization in which the voltage generated by the piezoelectric part due to the pressure is applied between the electrodes of the positive electrode and the ground electrode to generate a current, and the intersection of the elongated electrodes is in contact due to the pressure, causing the generated current to be divided; and an intrusion detection unit that identifies the intersection of the elongated electrodes where the current division occurred based on the energization state detected by the current detection unit and detects intrusion from the outside.

Description

Technical Field

[0001] The present invention relates to an intrusion detection device for detecting intrusion into a target area, and particularly to an intrusion detection device capable of detecting intrusion with high accuracy in a wide target area.

Background Art

[0002] A security system is a system necessary for preventing crimes such as theft committed by unauthorized intrusion of intruders such as people and animals into a site. In current security systems, devices such as cameras and infrared sensors are generally used.

[0003] However, regarding the installation of devices such as cameras, there are physical dead spots and locations where installation is impossible, and there is room for improvement in the security function. That is, when the installation location of a camera or the like is discovered by an intruder, the intruder can intentionally enter a physical dead spot, and the intrusion will not be detected. In addition, since devices such as cameras always require an activation power supply, they cannot be installed in the first place in locations where power cannot be obtained, such as deep in the mountains. If an intruder discovers such an installation-impossible location, the intruder can intentionally enter the installation-impossible location, and the intrusion will not be detected.

[0004] Further, even if a device such as a camera can be installed, depending on the location and time zone, for example, in a dark place such as a shaded area or at night, it is difficult to detect the intrusion of an intruder using a device such as a camera.

[0005] Therefore, conventionally, in a vast field or the like where a device such as a camera alone cannot cope, a battery-free security system has been expected.

[0006] Here, although it is a technology different from an intrusion detection device, conventionally, a technology for detecting stress by receiving pressure on a touch panel, such as a stress detection device, is known (see Patent Document 1). Various intrusion detection devices that attempt to apply such a technology for detecting stress from pressure to the pressure generated when a person or animal walks and use it for an intrusion detection device have been disclosed.

[0007] For example, a conventional intrusion detection device is a piezoelectric sensor in which a piezoelectric layer is sandwiched between an upper electrode and a lower electrode, wherein the upper electrode has a plurality of first pattern electrodes extending in one direction, and the lower electrode has a plurality of second pattern electrodes extending in another direction intersecting the first direction (see Patent Document 2).

[0008] Furthermore, as a conventional intrusion detection device, there is a piezoelectric sensor in which a piezoelectric layer is sandwiched between an upper electrode and a lower electrode, wherein the upper electrode has a plurality of first pattern electrodes extending in one direction, and the lower electrode has a plurality of second pattern electrodes extending in another direction intersecting the first direction, and the size of the first pattern electrodes in the width direction increases as it approaches the periphery of the piezoelectric layer (see Patent Document 3). [Prior art documents] [Patent Documents]

[0009] [Patent Document 1] Japanese Patent Application Publication No. 58-225379 [Patent Document 2] Japanese Patent Publication No. 2014-235133 [Patent Document 3] Japanese Patent Publication No. 2015-212707 [Overview of the Initiative] [Problems that the invention aims to solve]

[0010] However, conventional intrusion detection devices, as shown in Patent Documents 2 and 3, have a configuration in which a piezoelectric layer is sandwiched between an upper electrode and a lower electrode. In such a configuration, because the piezoelectric layer is sandwiched between the upper and lower electrodes, when an intruder walks, a strong and continuous pressure is applied directly to the outermost electrode first, which has the problem of reducing the durability of that electrode.

[0011] Furthermore, there is a challenge in that it is difficult to immediately determine at which point on the upper and lower electrodes a voltage was generated in response to the intruder's walking motion, that is, where the intruder's walking motion occurred. In other words, although the fact of an intruder's entry can be detected, it is not easy to determine where the intruder entered, which presents a challenge in identifying the crime, especially in large areas of the property.

[0012] The present invention was made to solve the aforementioned problems and aims to provide an intrusion detection device that exhibits high durability and can detect intrusions with high accuracy. [Means for solving the problem]

[0013] The intrusion detection device according to the present invention comprises: a positive electrode formed from electrodes having a matrix shape in which elongated electrodes intersect spaced apart at multiple intersections; a flat plate-shaped ground electrode formed from a conductive flat plate and disposed opposite to the upper part of the positive electrode; a flat plate-shaped piezoelectric part arranged in a stacked manner between the positive electrode and the ground electrode and generating a voltage when pressed by an external force; a current detection unit that detects a state of energization in which the voltage generated by the piezoelectric part due to the pressing force is applied between the electrodes of the positive electrode and the ground electrode to generate a current, and the intersection of the elongated electrodes is brought into contact by the pressing force and the generated current is divided; and an intrusion detection unit that identifies the intersection of the elongated electrodes where the current division occurred based on the energization state detected by the current detection unit and detects intrusion from the outside.

[0014] As described above, the intrusion detection device according to the present invention comprises a positive electrode formed from electrodes having a matrix shape in which elongated electrodes intersect at multiple intersections in a spaced-out manner; a flat ground electrode formed from a conductive flat plate, the flat plate being disposed opposite to the upper part of the positive electrode; a flat piezoelectric part stacked between the positive electrode and the ground electrode and generating a voltage when pressed from an external force; and a current detector that detects the current flowing when the voltage generated by the piezoelectric part due to the pressing force is applied between the electrodes of the positive electrode and the ground electrode, causing the intersection of the elongated electrodes to come into contact due to the pressing force. The device comprises an outlet and an intrusion detection unit that identifies the intersection of the elongated electrodes where the current split occurs based on the energized state detected by the current detection unit, and detects intrusion from the outside. As a result, the flat piezoelectric unit directly receives external pressure, and the piezoelectric unit initially generates a voltage due to the external pressure. Furthermore, the elongated electrodes, which were previously separated and intersecting, come into contact at a predetermined intersection due to this pressure. The current detection unit detects the energized state resulting from the current splitting from the voltage generated at that intersection, thereby accurately identifying the location of the intersection. This increases durability against external pressure and allows for accurate detection of external intrusion.

[0015] Furthermore, the intrusion detection device according to the present invention, if necessary, has an intrusion detection unit that calculates the current division ratio of the divided current based on the energized state detected by the current detection unit, identifies the intersection of the elongated electrodes where the current division occurred based on the current division ratio, and detects intrusion from the outside. In this way, the intrusion detection unit calculates the current division ratio of the divided current based on the energized state detected by the current detection unit, identifies the intersection of the elongated electrodes where the current division occurred based on the current division ratio, and detects intrusion from the outside. As a result, the position of the intersection can be uniquely identified from the current division ratio, and the location of the intrusion from the outside can be easily and accurately detected.

[0016] Furthermore, the intrusion detection device according to the present invention may optionally have a matrix shape in which the positive electrode is composed of a plurality of elongated electrodes that intersect at a distance from each other at a plurality of intersections, each end of the plurality of elongated electrodes is provided with a switching element, and each of the plurality of elongated electrodes having the same longitudinal direction is provided with a switching unit that sequentially switches the intermittent state, and the intrusion detection unit identifies the intersection of the elongated electrodes where the current division occurred based on the presence or absence of current detected by the current detection unit and the elongated electrodes whose energized state has been identified by the switching unit.

[0017] Thus, the intrusion detection device according to the present invention has a matrix shape in which the positive electrode is composed of a plurality of elongated electrodes that intersect at a distance from each other at a plurality of intersections, each end of the plurality of elongated electrodes is provided with a switching element, and each of the plurality of elongated electrodes having the same longitudinal direction is provided with a switching unit that sequentially switches the intermittent state, and the intrusion detection unit identifies the intersection of the elongated electrodes where the current division occurred based on the presence or absence of current detected by the current detection unit and the energized state of the elongated electrodes identified by the switching unit, so that the intersection of the elongated electrodes can be identified based only on the presence or absence of current detected by the current detection unit and the elongated electrodes identified by the switching unit, the position of the intersection can be identified simply and accurately, and the location of external intrusion can be easily and accurately detected.

[0018] Furthermore, the intrusion detection device according to the present invention may, if necessary, have projections on the ground electrode that face the piezoelectric part at positions corresponding to one or more of the intersections. In this way, since the intrusion detection device according to the present invention has projections on the ground electrode that face the piezoelectric part at positions corresponding to one or more of the intersections, the sensitivity of the pressure applied to the piezoelectric part is increased by pressure concentration, making it possible to detect the location of external intrusion more easily and accurately.

[0019] In addition, the intrusion detection device according to the present application, as necessary, is configured such that the intrusion detection unit specifies the type of intrusion from the outside and / or predicts the movement based on the mutual locations and / or the consecutive order of the plurality of specified intersections. Thus, since the intrusion detection unit specifies the type of intrusion from the outside and / or predicts the movement based on the mutual locations and / or the consecutive order of the plurality of specified intersections, the type of intrusion from the outside can be easily specified and / or the movement can be predicted based on the characteristics of the plurality of specified intersections, and the intrusion position from the outside can be detected more easily and accurately.

[0020] In addition, the intrusion detection device according to the present application, as necessary, is configured such that the ground-side electrode is made of a material selected from the group consisting of carbon, polypropylene, polyethylene, and tarpaulin. Thus, since the ground-side electrode is made of a material selected from the group consisting of carbon, polypropylene, polyethylene, and tarpaulin, the ground-side electrode has a certain conductivity and high strength, and with high durability, the intrusion position from the outside can be detected more easily and accurately.

Brief Description of the Drawings

[0021] [Figure 1] The configuration diagram of the intrusion detection device according to the first embodiment of the present invention is shown. [Figure 2] The configuration example of the long electrode of the intrusion detection device according to the first embodiment of the present invention is shown. [Figure 3] The electrical arrangement of the intrusion detection device according to the first embodiment of the present invention is shown. [Figure 4] The current detection example of the intrusion detection device according to the first embodiment of the present invention is shown. [Figure 5] The configuration diagram of the intrusion detection device according to the second embodiment of the present invention is shown. [Figure 6] The electrical arrangement of the intrusion detection device according to the second embodiment of the present invention is shown. [Figure 7] The explanatory diagram explaining the protrusion of the intrusion detection device according to the third embodiment of the present invention is shown. [Figure 8] This diagram illustrates the type identification of an intrusion detection device according to a fourth embodiment of the present invention. [Figure 9] This diagram illustrates the movement prediction of an intrusion detection device according to a fourth embodiment of the present invention. [Figure 10] This diagram illustrates the movement prediction of an intrusion detection device according to a fourth embodiment of the present invention. [Modes for carrying out the invention]

[0022] (First embodiment) As shown in Figure 1, the intrusion detection device according to the first embodiment comprises a positive electrode 1 formed from electrodes having a matrix shape in which elongated electrodes 11 (and elongated electrodes 12 if necessary) intersect at a distance from each other at multiple intersections; a flat plate-shaped ground electrode 2 formed from a conductive flat plate and disposed opposite to the upper part of the positive electrode 1; a flat plate-shaped piezoelectric part 3 stacked between the positive electrode 1 and the ground electrode 2 and generating a voltage when pressed by an external pressure; a current detection unit 4 (first current detection unit 41 and second current detection unit 42) that detects a state of energization in which the generated current is divided when the voltage generated by the piezoelectric part 3 is applied between the electrodes of the positive electrode 1 and the ground electrode 2 due to this pressure, causing the intersection of the elongated electrodes 11 to be in contact due to this pressure; and an intrusion detection unit 5 that identifies the intersection of the elongated electrodes 11 where the current division occurred based on the energization state detected by the current detection unit 4 and detects intrusion from the outside.

[0023] The elongated electrode 11 (and elongated electrode 12 if necessary) that constitutes the positive electrode 1 may consist of one or multiple electrodes, as long as they intersect at multiple points in a spaced-out manner. For example, when the elongated electrode 11 is composed of multiple electrodes, it is possible to configure it in a so-called grid shape, as shown in Figure 2(a), where each of the multiple elongated electrodes 11 and elongated electrodes 12 has an intersection point. In this case, by placing a current detection unit 4 for each elongated electrode 11, intrusion can be detected with high sensitivity.

[0024] Furthermore, the configuration of the positive electrode 1 is not limited to the above, and for example, it can be composed of one or two elongated electrodes 11. For example, as shown in Figure 2(b) or Figure 2(c), it is possible to construct one or two elongated electrodes 11 (positive electrode 1) in a so-called single-stroke shape without being interrupted. In this case, it is sufficient to place current detection units 4 at both ends of the elongated electrode 11 and / or elongated electrode 12 (positive electrode 1), thereby simplifying the device and reducing manufacturing costs.

[0025] The ground electrode 2 is not particularly limited as long as it is made of a conductive material, but more preferably it is made of a material selected from the group consisting of carbon, polypropylene, polyethylene, and tarpaulin. This ensures that the ground electrode 2 has a certain level of conductivity and high strength, and even when subjected to external pressure, the ground electrode 2 absorbs the pressure and exhibits higher durability.

[0026] This piezoelectric part 3 can, for example, use a piezoelectric element, and more preferably, a piezoelectric element thin film can be used. By using a piezoelectric element thin film, this piezoelectric part 3 can be formed at low cost and easily.

[0027] This current detection unit 4 detects the energized state in which the current generated by the contact of the intersection of the elongated electrodes 11 due to external pressure is divided.

[0028] The mechanism by which this current is generated is as follows: First, a voltage is generated in the piezoelectric part 3 due to external pressure, such as when a person or animal steps on the ground. Next, this pressure causes the elongated electrode 11 to be compressed from above, and the intersection of the elongated electrode 11, which was initially separated, transitions to a contact state. Then, the voltage generated in the piezoelectric part 3 generates a current at the intersection of the elongated electrode 11 that is now in contact. This generated current then branches out from the intersection of the elongated electrode 11.

[0029] The current detection unit 4 detects this divided current state. In this embodiment of the intrusion detection device, as shown in Figure 3, the resistance value R1 of the ground electrode 2 is significantly larger than the resistance values ​​R2 and R3 of the elongated electrode 11 (R1 >> R2, R3). Therefore, the voltage V1 generated in the piezoelectric unit 3 by the pressing force F causes no current to flow through the ground electrode 2, but current flows through the elongated electrode 11. As a result, the current detection unit 4 can detect the current division that originates from the intersection of the elongated electrode 11 using the currents detected by the first current detection unit 41 and the second current detection unit 42.

[0030] The intrusion detection unit 5 identifies the intersection of the elongated electrode 11 (and elongated electrode 12 if necessary) where the current split occurred, based on the energized state detected by the current detection unit 4. For example, if the elongated electrode 11 and elongated electrode 12 are composed of multiple elongated electrodes arranged in a grid shape, the intrusion detection unit 5, as shown in Figure 4(a), determines the current splitting ratio (I) of the split current based on the energized state detected by the current detection unit 4. m / I n ) is calculated, and this flow division ratio (I m / I n Based on this, the resistance ratio (r m / r n By obtaining this, the intersection A of the elongated electrode 11 where the current diversion occurred can be identified, and intrusion from the outside can be detected.

[0031] Furthermore, for example, if the long electrode 11 (positive electrode 1) is composed of a single unit, forming a so-called single-stroke shape, the intrusion detection unit 5, as shown in Figure 4(b), calculates the current division ratio (I1 / I2) of the divided current based on the energized state detected by the current detection unit 4, and obtains the resistance ratio (r1 / r2) based on this current division ratio (I1 / I2). This allows the intersection A of the long electrode 11 where the current division occurred to be identified, and external intrusion can be detected.

[0032] In this way, the intrusion detection unit 5 can uniquely identify the location of this intersection from the flow division ratio, and can easily and accurately detect the location of intrusion from the outside.

[0033] As described above, the intrusion detection device according to the present invention, with the above configuration, has a flat piezoelectric part 3 that directly receives external pressure, and the piezoelectric part 3 initially generates a voltage in response to the external pressure. Furthermore, the elongated electrodes 11 (and elongated electrodes 12 if necessary), which were intersecting at a distance from each other, come into contact at a predetermined intersection due to this pressure. The current flowing state resulting from the current being divided from the voltage generated at this intersection is detected by the current detection unit 4, allowing the position of this intersection to be accurately identified. This increases durability against external pressure and enables accurate detection of the location of external intrusion.

[0034] (Second embodiment) The intrusion detection device according to the second embodiment is configured to include the same as the first embodiment, the positive electrode 1, the ground electrode 2, the piezoelectric unit 3, the current detection unit 4, and the intrusion detection unit 5. Furthermore, as shown in Figure 5, the positive electrode 1 has a matrix shape composed of a plurality of elongated electrodes 11 and elongated electrodes 12 that intersect at a distance from each other at a plurality of intersection points, and each end of the plurality of elongated electrodes 11 and elongated electrodes 12 is provided with a switching element 61, and a switching unit 6 is provided to sequentially switch the intermittent state for each plurality of elongated electrodes 11 and elongated electrodes 12 having the same longitudinal direction, and the intrusion detection unit 5 is configured to identify the intersection point of the elongated electrodes 11 and elongated electrodes 12 where the current division occurred, based on the presence or absence of current detected by the current detection unit 4 and the energized state of the elongated electrodes 11 identified by the switching unit 6.

[0035] As shown in Figure 5, the switching unit 6 includes a switching management unit 62 that controls the sequential switching of the intermittent state for each of the multiple elongated electrodes 11 and elongated electrodes 12 having the same longitudinal direction among the switching elements 61.

[0036] This switching management unit 62 controls the switching element 61 to scan it cyclically, as shown in Figure 6, for example, S2 and S m When the switching element 61 is turned ON, if an external pressing force F is applied, the first current detection unit 41 and the second current detection unit 42 detect a current. In this case, the current detection unit 4 does not need to numerically verify the detected current, but based solely on the fact that a current has flowed, and in cooperation with the switching management unit 62, it respectively detects S2 and S m The current can be immediately detected when current flows to the location where the switching element 61 is connected. In other words, the current detection unit 4 only needs to detect whether the current is on or off, and by confirming the position of the switching element 61 that has been turned on by the control of the switching management unit 62, the intersection of the elongated electrodes 11 and 12 that are pressed by the pressing force F can be easily identified.

[0037] Thus, the intrusion detection device according to the present invention has a matrix shape in which the positive electrode 1 is composed of multiple elongated electrodes 11 and elongated electrodes 12 that intersect at multiple intersections in a spaced-out manner, and each end of the multiple elongated electrodes 11 and elongated electrodes 12 is provided with a switching element 61, and a switching unit 6 is provided that sequentially switches the intermittent state for each of the multiple elongated electrodes 11 and elongated electrodes 12 having the same longitudinal direction, and the intrusion detection unit 5 identifies the intersection of the elongated electrodes 11 where current division has occurred based on the presence or absence of current detected by the current detection unit 4 and the energized state of the elongated electrodes 11 and elongated electrodes 12 identified by the switching unit 6, so that the intersection of the elongated electrodes 11 and elongated electrodes 12 can be identified based only on the presence or absence of current detected by the current detection unit 4 and the elongated electrodes 11 and elongated electrodes 12 identified by the switching unit 6, the position of the intersection can be identified simply and accurately, and the location of intrusion from the outside can be easily and accurately detected.

[0038] (Third embodiment) The intrusion detection device according to the third embodiment comprises the positive electrode 1, the ground electrode 2, the piezoelectric unit 3, the current detection unit 4, and the intrusion detection unit 5, similar to the first embodiment described above. Furthermore, as shown in Figure 7, the ground electrode 2 has a configuration in which a projection 21 is projected toward the piezoelectric unit 3 at one or more positions corresponding to the intersections.

[0039] As shown in Figure 7(a), the projection 21 has a protruding shape toward the piezoelectric part 3 at positions corresponding to one or more intersections of the ground-side electrode 2. With this configuration, as shown in Figure 7(b), the projection 21 efficiently transmits the external pressing force F to the piezoelectric part 3 through pressure concentration at the location of the ground-side electrode 2 that receives an external pressing force F, such as when a person or animal steps on the ground. For example, even if the pressing force F is weak, such as when an intruder is a light animal or steps on the ground with little force, the pressure can be increased and reliably transmitted to the piezoelectric part 3 without any detection failures.

[0040] The material constituting this projection 21 is not particularly limited, but a material that exhibits a certain degree of strength is preferable because it is more likely to exhibit the above-mentioned pressure concentration.

[0041] Thus, in the intrusion detection device according to the present invention, the ground electrode 2 has projections 21 that protrude toward the piezoelectric part 3 at positions corresponding to one or more intersections. As a result, the sensitivity of the pressure applied to the piezoelectric part 3 is increased by pressure concentration, making it possible to detect the location of external intrusion more easily and accurately.

[0042] (Fourth embodiment) The intrusion detection device according to the fourth embodiment, like the first embodiment, comprises the positive electrode 1, the ground electrode 2, the piezoelectric unit 3, the current detection unit 4, and the intrusion detection unit 5. Furthermore, as shown in Figure 8, the intrusion detection unit 5 is configured to identify the type of intrusion from the outside and / or predict its movement based on the relative locations and / or consecutive order of a plurality of identified intersections.

[0043] Regarding the identification of the interrelationships of multiple intersections identified simultaneously and the type of external intrusion, for example, as shown in Figure 8(a), if the interval between these intersections is approximately 30 mm, and there are 9 to 12 intersections identified simultaneously, it can be predicted that these are traces left by human feet. Similarly, for example, as shown in Figure 8(b), if there are 1 to 4 intersections identified simultaneously, it can be predicted that these are traces left by wild boar feet.

[0044] In addition to the number of intersections identified simultaneously, the shape of these intersections can also be considered in the prediction. For example, if the simultaneously identified intersections are within a range of 50 mm in width and 75 mm in height, they can be predicted to be traces of wild boar feet. Similarly, if the simultaneously identified intersections are within a range of 116 mm in width and 255 mm in height, they can be predicted to be traces of human feet.

[0045] Regarding the sequential order of multiple intersections identified simultaneously and the prediction of movement of external intrusions, for example, as shown in Figure 9, if multiple intersections identified simultaneously transition from location X1 to location X2, it becomes possible to predict the movement of the external intrusion to location X3 in the future.

[0046] Furthermore, the intrusion detection device according to this embodiment can be easily scaled up. For example, as shown in Figure 10, even when targeting a vast field or orchard, as described above, if the multiple intersections identified simultaneously move over a wider area from location X1 to locations X2, X3, ..., it can be easily determined that the movement is from the starting point C to location D, and then from location D to location E. Also, since the movement turns back at location D, it can be predicted that the crime may have occurred at location D.

[0047] Thus, since the intrusion detection unit 5 identifies the type of intrusion and / or predicts its movement based on the interrelationships and / or consecutive order of the identified intersections, the type of intrusion and / or movement of the intrusion can be easily identified and / or predicted based on the characteristics of the identified intersections, making it possible to detect the location of the intrusion even more easily and accurately. [Explanation of Symbols]

[0048] 1. Positive side electrode 11 Long electrode 12 Long electrode 2 Ground side electrode 21 Protrusion 3. Piezoelectric element 4. Current detection unit 41 First current detection unit 42 Second current detection unit 5. Intrusion detection unit 6. Switching section 61 Switching elements 62 Switching Management Department

Claims

1. A positive electrode is formed from an electrode having a matrix shape in which elongated electrodes intersect at multiple points in a spaced-out manner, A flat plate-shaped ground electrode is formed from a conductive plate and is positioned opposite the upper part of the positive electrode, A flat, plate-shaped piezoelectric element is arranged in a stacked manner between the positive electrode and the ground electrode, and generates a voltage when subjected to external pressure. The voltage generated in the piezoelectric part by the pressing force is applied between the positive electrode and the ground electrode to generate a current, and the current detection unit detects the current being divided when the intersection of the elongated electrodes is brought into contact by the pressing force, Based on the energizing state detected by the current detection unit, an intrusion detection unit identifies the intersection of the elongated electrodes where the current split occurred and detects intrusion from the outside. Features that Intrusion detection device.

2. In the intrusion detection device according to claim 1, The intrusion detection unit calculates the current division ratio of the divided current based on the energized state detected by the current detection unit, identifies the intersection of the elongated electrodes where the current division occurred based on the current division ratio, and detects intrusion from the outside. Intrusion detection device.

3. In the intrusion detection device according to claim 1, The positive electrode has a matrix shape composed of multiple elongated electrodes that intersect at multiple intersections in a spaced-out manner. Each end of the multiple elongated electrodes is equipped with a switching element, and a switching unit is provided to sequentially switch the intermittent state for each of the multiple elongated electrodes having the same longitudinal direction. The intrusion detection unit is characterized in that it identifies the intersection of the elongated electrodes where the current split occurred, based on the presence or absence of current detected by the current detection unit and the energized state of the elongated electrodes determined by the switching unit. Intrusion detection device.

4. In the intrusion detection device according to claim 1, The ground electrode is characterized in that it has projections that protrude toward the piezoelectric part at positions corresponding to one or more of the intersections. Intrusion detection device.

5. In the intrusion detection device according to claim 1, The intrusion detection unit is characterized by identifying the type of intrusion from the outside and / or predicting its movement based on the relative locations and / or consecutive order of the identified plurality of intersections. Intrusion detection device.

6. In the intrusion detection device according to claim 1, The ground electrode is characterized by being made of a material selected from the group consisting of carbon, polypropylene, polyethylene, and tarpaulin. Intrusion detection device.

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