Wiring sheet, detection sensor, and detection system

Abstract

To enable easy determination as to which area between two conductive wires has become conductive due to moisture.SOLUTION: A wiring sheet is provided, comprising a base substrate 11 and two conductive wires 12a, 12b, each having a resistance detection terminal 13a, 13b at one end thereof, arranged on one surface of the base substrate 11 with a distance therebetween, where at least one of the two conductive wires 12a, 12b has a volume that increases from another end toward the one end.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a wiring sheet, a detection sensor, and a detection system. [Background technology]

[0002] A technology is known in which two conductive wires are formed parallel to each other on a base substrate, and when moisture adheres to the conductive wires, the two wires short-circuit to detect liquid leakage (see, for example, Patent Document 1).

[0003] In recent years, it has been considered to use such technology to detect the water level of rivers, etc. For example, a resistance detection means for detecting the resistance between two conductive wires is connected to one end of each of the two conductive wires. Then, based on the detected resistance, it is possible to detect the water level by determining which area the two conductive wires are conductive in, i.e., how far the area is submerged in water. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 5-87547 Summary of the Invention [Problem to be solved by the invention]

[0005] However, as described above, in a device in which a resistance value detection means for detecting the resistance value between two conductive wires is connected to one end of each of the two conductive wires and the water level is detected based on the detected resistance value, it may be difficult to detect a change in resistance value due to the conductive point of the two conductive wires. For example, when used outdoors, it is possible to use conductive carbon or the like in consideration of the weather resistance of the conductive wire. When such a material with a high resistance value is used, even if the conductive point of the two conductive wires changes, the change in resistance value may be very small. Therefore, it becomes difficult to detect a change in the water level. In particular, the longer the length of the conductive wire, the less likely it is that a change in resistance value will occur at the other end side of the conductive wire, making it difficult to detect a change in the water level.

[0006] In addition, since the change in resistance value when the conductive wiring changes is very small, there is a risk that even if the resistance value changes slightly due to deterioration of the conductive wiring, it will be mistakenly determined that the water level has changed.

[0007] Such problems arise not only when detecting changes in water level as described above, but also when determining in which area along the length of the conductive wires moisture has occurred in an area where the conductive wires are arranged, causing electrical continuity between the two conductive wires.

[0008] The present invention has been made in consideration of the problems associated with the conventional technologies as described above, and aims to provide a wiring sheet, a detection sensor, and a detection system that can easily determine which area between two conductive wirings has become conductive due to moisture. [Means for solving the problem]

[0009] In order to achieve the above object, the present invention provides A base material; Each of the base members has a resistance value detection terminal at one end thereof, and has two conductive wirings formed at a distance from each other on one surface of the base member; At least one of the two conductive wires is a wiring sheet whose volume increases from the other end side toward the one end side.

[0010] In the present invention configured as described above, at least one of the two conductive wires formed on the base material and each having a resistance value detection terminal at one end increases in volume from the other end side to the one end side, so that the resistance value of at least one of the two conductive wires changes significantly in the direction in which the two conductive wires extend. As a result, when the two conductive wires are conductive to each other due to adhering moisture, the resistance value between the resistance value detection terminals of the two conductive wires can be changed according to the conductive location, and it can be easily determined which area between the two conductive wires has become conductive due to moisture.

[0011] Also, at least one of the two conductive wires may be configured so that the volume increases stepwise from the end of the other wire toward the end of the one wire. In such a configuration, the stepwise change in the volume of the conductive wire causes the resistance value of the conductive wire to change stepwise, and this stepwise change in resistance value can be used to more easily determine which region between the two conductive wires has become conductive due to moisture.

[0012] At least one of the two conductive wires may have a stepped shape.

[0013] At least one of the two conductive wires may be made of a mesh pattern, with the mesh density increasing from the other end side toward the one end side.

[0014] At least one of the two conductive wires may have a thickness that increases stepwise from the other end toward the one end.

[0015] The base substrate may be divided into two regions, one in which one of the two conductive wires is formed and the other in which the other conductive wire is formed. In this configuration, when detecting the water level, it is possible to prevent the two conductive wires from becoming conductive due to moisture remaining on the base substrate in the region in which the conductive wires are not immersed in water. It is also possible to prevent rainwater or the like that is not the detection target from adhering between the two conductive wires on the base substrate, causing the two conductive wires to become conductive due to rainwater or the like.

[0016] Further, as a detection sensor using the wiring sheet, The electrical wiring may further include a resistance detection means connected to the resistance detection terminals of the two conductive wires, respectively, for detecting a resistance between the resistance detection terminals of the two conductive wires.

[0017] Further, as a detection system using the wiring sheet, a resistance value detection means connected to the resistance value detection terminals of the two conductive wirings, respectively, for detecting a resistance value between the resistance value detection terminals of the two conductive wirings; The configuration may further include a determination means for determining at which step, of the steps, the two conductive wires are brought into conduction, based on the resistance value detected by the resistance value detection means. Effect of the Invention

[0018] According to the present invention, when two conductive wires become conductive to each other due to adhering moisture, the resistance value between the resistance detection terminals of the two conductive wires can be greatly changed depending on the location of conduction, making it easy to determine which area between the two conductive wires has become conductive due to moisture.

[0019] Furthermore, in cases where at least one of the two conductive wires has a volume that increases stepwise from the other end toward the one end, the stepwise change in volume of the conductive wire also causes a stepwise change in the resistance value of the conductive wire, and this stepwise change in resistance value can be used to more easily determine which area between the two conductive wires has become conductive due to moisture.

[0020] In addition, in a base substrate divided into two regions, one where one of the two conductive wires is formed and the other where the other conductive wire is formed, when detecting the water level, it is possible to prevent the two conductive wires from becoming conductive due to moisture remaining on the base substrate in the region where the conductive wires are not immersed in water. It is also possible to prevent rainwater or the like that is not the detection target from adhering between the two conductive wires on the base substrate, causing the two conductive wires to become conductive due to rainwater or the like. [Brief description of the drawings]

[0021] [Figure 1] FIG. 1 shows a first embodiment of a wiring sheet of the present invention, where (a) is a diagram showing the configuration of the surface, and (b) is a cross-sectional view taken along the line AA shown in (a). [Diagram 2] 2 is a diagram showing an example of a detection system using the wiring sheet shown in FIG. 1. [Diagram 3] 3 is a block diagram showing a functional configuration of the RFID tag shown in FIG. 2. [Figure 4] 3 is a block diagram showing a functional configuration of the inspection device shown in FIG. 2. [Diagram 5] 3 is a diagram for explaining a method of detecting a water level using the detection system shown in FIG. 2. [Figure 6] 2 is a diagram showing a change in resistance value due to water level when two conductive wires in the wiring sheet shown in FIG. 1 are made conductive by water. FIG. [Figure 7] FIG. 4 is a diagram showing a second embodiment of a wiring sheet of the present invention. [Figure 8] FIG. 4 is a diagram showing a third embodiment of the wiring sheet of the present invention. [Figure 9]FIG. 13 is a diagram showing a fourth embodiment of the wiring sheet of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0023] (First embodiment) <Wiring sheet configuration> FIG. 1 shows a first embodiment of a wiring sheet of the present invention, where (a) is a diagram showing the configuration of the surface, and (b) is a cross-sectional view taken along the line AA shown in (a).

[0024] As shown in FIG. 1, this embodiment is a wiring sheet 10 configured by forming two conductive wires 12a, 12b on a base material 11.

[0025] The base material 11 is made of an insulating material such as a film and has a long rectangular shape. The base material 11 is preferably water resistant.

[0026] The conductive wirings 12a, 12b extend in parallel to each other at intervals in the longitudinal direction of the base substrate 11 on one surface of the base substrate 11, and have resistance value detection terminals 13a, 13b at one end of the conductive wirings 12a, 12b in the extension direction. Each of the conductive wirings 12a, 12b is configured such that the widths in the short side direction of the four regions R1 to R4 divided in the extension direction of the conductive wirings 12a, 12b are different from each other. Specifically, the width W1 of the region R1 including the resistance value detection terminals 13a, 13b of the conductive wirings 12a, 12b is the widest, the width W2 of the region R2 adjacent to the region R1 on the opposite side to the resistance value detection terminals 13a, 13b is the next widest, the width W3 of the region R3 adjacent to the region R2 on the opposite side to the region R1 is the next widest, and the width W4 of the region R4 adjacent to the region R3 on the opposite side to the region R2 and including the ends of the conductive wirings 12a, 12b on the opposite side to the resistance value detection terminals 13a, 13b is the narrowest. At this time, the distance D1 between the conductive wirings 12a, 12b is constant in the direction in which the conductive wirings 12a, 12b extend. As a result, each of the conductive wirings 12a, 12b is in a stepped shape having a step on the end side opposite to the end sides facing each other. Furthermore, with regard to the length of the four regions R1 to R4 in the direction in which the conductive wires 12a and 12b extend, region R1 is the shortest, followed by region R2, then region R3, and region R4 is the longest.

[0027] 1, the wiring sheet 10 having the conductive wirings 12a, 12b having four regions R1 to R4 with different lengths and widths is described as an example, but the number of regions with different lengths and widths is not limited to four, and all of the regions do not have to have different lengths. For example, a wiring sheet having seven regions, the first region from the end side where the resistance value detection terminals 13a, 13b are provided has a length of 250 mm and a width of 80 mm, the second region has a length of 250 mm and a width of 60 mm, the third region has a length of 250 mm and a width of 40 mm, the fourth region has a length of 250 mm and a width of 20 mm, the fifth region has a length of 500 mm and a width of 10 mm, the sixth region has a length of 500 mm and a width of 5 mm, and the seventh region has a length of 2000 mm and a width of 2 mm, and the total length is 4 m.

[0028] In this manner, the area of ​​the two conductive wirings 12a, 12b formed on the base material 11 increases stepwise from the end opposite the resistance value detection terminals 13a, 13b toward the end having the resistance value detection terminals 13a, 13b.

[0029] The conductive wirings 12a and 12b may be made of conductive carbon. Since conductive carbon has high chemical resistance and is resistant to oxidation, when the wiring sheet 10 is used for moisture detection as described below, it has excellent durability and can stably detect moisture.

[0030] Usage of the wiring sheet 10 The wiring sheet 10 configured as described above can be used to detect the water level in a river or the like, for example.

[0031] Fig. 2 is a diagram showing an example of a detection system using the wiring sheet 10 shown in Fig. 1. Fig. 3 is a block diagram showing a functional configuration of the RFID tag 30 shown in Fig. 2. Fig. 4 is a block diagram showing a functional configuration of the inspection device 50 shown in Fig. 2.

[0032] When the wiring sheet 10 shown in FIG. 1 is used to detect a water level as described later, a connector 20 is attached to an end of the wiring sheet 10 on the side of the resistance value detection terminals 13a and 13b, as shown in FIG. 2. The connector 20 has two connection terminals (not shown) provided therein, and when the connector 20 is attached to the wiring sheet 10, the connection terminals of the connector 20 are electrically connected to the resistance value detection terminals 13a and 13b. In addition, the connection terminals of the connector 20 are electrically connected to the lead wires 40a and 40b connected to the RFID tag 30. As a result, by attaching the connector 20 to the wiring sheet 10, the conductive wirings 12a and 12b of the wiring sheet 10 are electrically connected to the RFID tag 30 via the connector 20 and the lead wires 40a and 40b. In this manner, the RFID tag 30 is electrically connected to the wiring sheet 10, thereby forming an example of a detection sensor of the present invention.

[0033] As shown in FIG. 3, the RFID tag 30 has an IC chip 31 and an antenna 32 .

[0034] The IC chip 31 is connected to the conductive wires 12a and 12b via the lead wires 40a and 40b and the connector 20, and has a resistance value detection section 33 and a communication section .

[0035] The resistance value detection unit 33 is an example of a resistance value detection means in the present invention. The resistance value detection unit 33 detects the resistance value between the resistance value detection terminals 13a, 13b via the lead wires 40a, 40b and the connector 20.

[0036] The communication unit 34 transmits the resistance value detected by the resistance value detection unit 33 via the antenna 32 in a non-contact manner.

[0037] With the connector 20 attached to the wiring sheet 10, the inspection device 50 is brought close to the RFID tag 30 configured as described above. Then, power is supplied from the inspection device 50 to the RFID tag 30, and the resistance value detected by the resistance value detection unit 33 of the RFID tag 30 is contactlessly transmitted via the communication unit 34 and the antenna 32 and acquired by the inspection device 50.

[0038] The inspection device 50 has an antenna 51, a communication unit 52, a resistance value acquisition unit 53, and a water level determination unit 54, and may be, for example, a handheld terminal type reader / writer capable of reading information from the RFID tag 30 in a non-contact state.

[0039] The communication unit 52 performs non-contact communication with the RFID tag 30 via the antenna 51 to read and write information.

[0040] The resistance value acquiring unit 53 acquires the resistance value detected by the resistance value detecting unit 33 through non-contact communication with the RFID tag 30 via the communication unit 52 .

[0041] The water level determination unit 54 is an example of a determination means in the present invention. The water level determination unit 54 determines the water level by determining in which region the conductive wires 12a, 12b are electrically connected, i.e., in which stage of the regions R1 to R4 shown in FIG. 1, based on the resistance value acquired by the resistance value detection unit 33.

[0042] <Water level detection method> A method for detecting a water level using the detection system configured as above will be described below.

[0043] FIG. 5 is a diagram for explaining a method of detecting a water level using the detection system shown in FIG.

[0044] When detecting the water level using the detection system shown in Fig. 2, wiring sheet 10 is placed in the area where the water level is to be detected, as shown in Fig. 5. At this time, wiring sheet 10 is placed so that the end side to which connector 20 is attached is on the upper side.

[0045] In this state, as shown in FIG. 5, when the conductive wirings 12a, 12b are immersed in the water 2 to an extent corresponding to the water level, the conductive wirings 12a, 12b are short-circuited via the water 2 between the contact point Pa of the conductive wiring 12a, which is in contact with the water surface 2a, and the contact point Pb of the conductive wiring 12b, thereby becoming conductive.

[0046] Therefore, in this state, when a current is supplied from the inspection device 50 to the conductive wirings 12a, 12b via the RFID tag 30, a current flows through the conductive wirings 12a, 12b. Then, in the resistance value detection unit 33 of the RFID tag 30, the resistance value from the resistance value detection terminal 13a of the conductive wiring 12a to the resistance value detection terminal 13a via the contact points Pa, Pb is detected.

[0047] The resistance value detected by the resistance value detection unit 33 is transmitted non-contact from the RFID tag 30 to the inspection device 50 via the communication unit 34 and the antenna 32, and is acquired by the resistance value acquisition unit 53 via the antenna 51 and communication unit 52 of the inspection device 50.

[0048] Then, in the water level determination unit 54, the water level is determined based on the resistance value acquired by the resistance value detection unit 33.

[0049] Here, a specific method for determining the water level in the water level determining unit 54 will be described.

[0050] As described above, in a device in which a resistance detection means for detecting the resistance between the resistance detection terminals of two conductive wires is connected to one end of each of the two conductive wires and the water level is detected based on the detected resistance, even if the conductive points of the two conductive wires change, the change in the resistance may be very small, making it difficult to detect the change in the water level.

[0051] Therefore, in the wiring sheet 10 shown in FIG. 1, the area of ​​the conductive wirings 12a, 12b increases stepwise from the end opposite the resistance value detection terminals 13a, 13b toward the end having the resistance value detection terminals 13a, 13b.

[0052] FIG. 6 is a diagram showing a change in resistance value due to water level when two conductive wires 12a, 12b in wiring sheet 10 shown in FIG. 1 are made conductive by water.

[0053] As described above, the conductive wirings 12a, 12b of the wiring sheet 10 shown in FIG. 1 are configured such that the widths W1 to W4 in the short side direction are different from each other in the four regions R1 to R4. Due to the difference in the widths W1 to W4, when the conductive wirings 12a, 12b are conductive through water, as shown in FIG. 6, the resistance value detected by the RFID tag 30 changes significantly when the conductive portion is the boundary portion P1 to P3 of the regions R1 to R4. Specifically, the width W1 of the conductive wirings 12a, 12b is the widest in the region R1, and therefore the resistance value is the lowest. The width W2 of the conductive wirings 12a, 12b is the second widest in the region R2, and therefore the resistance value is the second lowest. The width W1 of the conductive wirings 12a, 12b is the third widest in the region R3, and therefore the resistance value is the third lowest. The width W4 of the conductive wirings 12a, 12b is the narrowest in the region R4, and therefore the resistance value is the highest.

[0054] Furthermore, because the resistance values ​​of these regions R1 to R4 are significantly different from one another, the resistance value range r1 of the resistance values ​​in which conductive wirings 12a, 12b are in contact with the water surface 2a in region R1 and thus conductive, the resistance value range r2 of the resistance values ​​in which conductive wirings 12a, 12b are in contact with the water surface 2a in region R2 and thus conductive, the resistance value range r3 of the resistance values ​​in which conductive wirings 12a, 12b are in contact with the water surface 2a in region R3 and thus conductive, and the resistance value range r4 of the resistance values ​​in which conductive wirings 12a, 12b are in contact with the water surface 2a in region R4 and thus conductive are significantly different.

[0055] In the water level determination unit 54, the estimated water level is calculated according to the length of each of the regions R1 to R4 of the conductive wirings 12a, 12b. For example, if the length of the region R1 is 250 mm, the length of the region R2 is 500 mm, the length of the region R3 is 1000 mm, and the length of the region R4 is 2000 mm, and if the wiring sheet 10 is placed so that the ends of the conductive wirings 12a, 12b opposite to the resistance value detection terminals 13a, 13b overlap with the region where the water level is 0, it is calculated that the region R4 corresponds to a water level of 0 to 2000 mm, the region R3 corresponds to a water level of 2000 to 3000 m, the region R2 corresponds to a water level of 3000 to 3500 m, and the region R1 corresponds to a water level of 3500 to 3750 m.

[0056] In the water level determination unit 54, the resistance value ranges r1 to r4 of the resistance values ​​detected for each of the regions R1 to R4 of the conductive wirings 12a, 12b are associated in a database with the water level ranges when the detected resistance values ​​are within the resistance value ranges r1 to r4.

[0057] Therefore, the water level determination unit 54 can determine the water level based on the resistance value acquired by the resistance value detection unit 33. Specifically, when the resistance value range of the resistance value acquired by the resistance value detection unit 33 is r4, the water level determination unit 54 can determine that the water level range is D4. Furthermore, when the resistance value range of the resistance value acquired by the resistance value detection unit 33 is r3, the water level determination unit 54 can determine that the water level range is D3. Furthermore, when the resistance value range of the resistance value acquired by the resistance value detection unit 33 is r2, the water level determination unit 54 can determine that the water level range is D2. Furthermore, when the resistance value range of the resistance value acquired by the resistance value detection unit 33 is r1, the water level determination unit 54 can determine that the water level range is D1.

[0058] In this embodiment, the conductive wirings 12a, 12b have areas that differ stepwise for each of the four regions R1 to R4. This allows the resistance values ​​of the conductive wirings 12a, 12b to be significantly changed depending on the region that is made conductive when the conductive wirings 12a, 12b are made conductive by water, making it easy to determine which of the regions R1 to R4 between the conductive wirings 12a, 12b are submerged in water, i.e., the water level.

[0059] In this embodiment, the length of the conductive wirings 12a, 12b in the four regions R1 to R4 in the direction of extension is the shortest in region R1, the next shortest in region R2, the next shortest in region R3, and the longest in region R4. Therefore, the higher the water level, the finer the region where the resistance value changes significantly becomes, making it easier to detect changes in the water level. In other words, the closer the water level is to the danger level, the easier it is to detect changes in the water level.

[0060] In this embodiment, the distance D1 between the conductive wires 12a, 12b is constant in the direction in which the conductive wires 12a, 12b extend, so that the conductive wires 12a, 12b are stepped at the ends opposite to the ends facing each other. However, the conductive wires 12a, 12b may be stepped at the ends facing each other as long as the areas of the conductive wires 12a, 12b are different from each other in a stepped manner so that the areas increase from the ends opposite the resistance value detection terminals 13a, 13b toward the ends on the resistance value detection terminals 13a, 13b side. However, as shown in this embodiment, if each of the conductive wirings 12a, 12b is configured in a stepped shape having a step on the end edge opposite the end edges facing each other, the distance D1 between the conductive wirings 12a, 12b is constant in the direction in which the conductive wirings 12a, 12b extend, and the amount of water required between the conductive wirings 12a, 12b to establish conductivity between the conductive wirings 12a, 12b is constant in the direction in which the conductive wirings 12a, 12b extend, so that changes in the water level can be detected accurately.

[0061] In the present embodiment, the RFID tag 30 detects the resistance value between the conductive wires 12a, 12b, and for example, transmits flag information corresponding to this resistance value to the inspection device 50 to determine the conduction state between the conductive wires 12a, 12b. However, the means for wirelessly transmitting the resistance value between the conductive wires 12a, 12b is not limited to using the RFID tag 30, and for example, a wireless system using Wi-Fi, Bluetooth, or LPWA may be used.

[0062] Second Embodiment FIG. 7 is a diagram showing a second embodiment of a wiring sheet of the present invention, illustrating the configuration of the surface.

[0063] As shown in FIG. 7, this embodiment is a wiring sheet 110 in which conductive wires 112a, 112b have different shapes from those shown in FIG.

[0064] The conductive wirings 112a and 112b in this embodiment are configured with a mesh pattern. Each of the conductive wirings 112a and 112b is configured so that the mesh densities of the mesh patterns in the four regions R1 to R4 divided in the direction in which the conductive wirings 112a and 112b extend are different from each other. Specifically, the mesh density of the region R1 including the resistance value detection terminals 113a and 113b of the conductive wirings 112a and 112b is the highest, the mesh density of the region R2 adjacent to the region R1 on the opposite side to the resistance value detection terminals 113a and 113b is the next highest, the mesh density of the region R3 adjacent to the region R2 on the opposite side to the region R1 is the next highest, and the mesh density of the region R4 adjacent to the region R3 on the opposite side to the region R2 and including the ends of the conductive wirings 112a and 112b on the opposite side to the resistance value detection terminals 113a and 113b is the lowest. The width W5 of the conductive wirings 112a, 112b and the distance D1 between the conductive wirings 112a, 112b are constant in the direction in which the conductive wirings 112a, 112b extend.

[0065] In the wiring sheet 110 of this embodiment, similarly to the wiring sheet 10 shown in FIG. 1, a connection connector 20 is attached to the end portion on the resistance value detection terminals 113a, 113b side, so that the conductive wirings 112a, 112b are connected to the RFID tag 30 and used.

[0066] When used for moisture detection, since the mesh densities of the mesh patterns of the conductive wirings 112a, 112b are different for each of the regions R1 to R4, when the conductive wirings 112a, 112b are conductive through water, the resistance value detected by the RFID tag 30 changes significantly when the conductive location is the boundary portion of the regions R1 to R4. Specifically, the region R1 has the highest mesh density of the conductive wirings 112a, 112b, and therefore has the lowest resistance value. The region R2 has the second highest mesh density of the conductive wirings 112a, 112b, and therefore has the second lowest resistance value. The region R3 has the third highest mesh density of the conductive wirings 112a, 112b, and therefore has the third lowest resistance value. The region R4 has the lowest mesh density of the conductive wirings 112a, 112b, and therefore has the highest resistance value.

[0067] Since the resistance values ​​of these regions R1 to R4 vary greatly from one another, the water level can be easily determined in the inspection device 50 based on the resistance value detected by the RFID tag 30, similar to that shown in FIG.

[0068] (Third embodiment) FIG. 8 is a diagram showing a third embodiment of a wiring sheet of the present invention, illustrating the configuration of the surface.

[0069] As shown in FIG. 8, this embodiment is a wiring sheet 210 in which conductive wires 212a, 212b have different shapes from those shown in FIG.

[0070] In this embodiment, the conductive wirings 212a, 212b are triangular in shape with the ends on the resistance value detection terminals 213a, 213b side as the base. As a result, the width W6 of the conductive wirings 212a, 212b changes in the direction in which the conductive wirings 212a, 212b extend. The distance D1 between the conductive wirings 212a, 212b is constant in the direction in which the conductive wirings 212a, 212b extend.

[0071] As a result, although the resistance values ​​of the conductive wirings 12a, 12b, 112a, and 112b do not change stepwise in the direction in which the conductive wirings 12a, 12b, 112a, and 112b extend as in the conductive wirings 212a and 212b shown in Figures 1 and 8, the change in resistance value in the direction in which the conductive wirings 212a and 212b extend is large.

[0072] 1, in the wiring sheet 210 of this embodiment, a connector 20 is attached to the end portion on the side of the resistance value detection terminals 213a, 213b, so that the conductive wirings 212a, 212b are connected to the RFID tag 30 for use. Since the change in resistance value in the direction in which the conductive wirings 212a, 212b extend is large, the water level can be easily determined in the inspection device 50 based on the resistance value detected in the RFID tag 30.

[0073] (Fourth embodiment) FIG. 9 is a diagram showing a fourth embodiment of a wiring sheet of the present invention, illustrating the configuration of the surface.

[0074] As shown in FIG. 9, the wiring sheet 310 of this embodiment is different from that shown in FIG. 1 in that it has two base substrates 311a and 311b. Conductive wiring 12a is formed on one surface of the base substrate 311a, and conductive wiring 12b is formed on one surface of the base substrate 311b. That is, the base substrate shown in FIG. 1 is divided into two regions, an area where the conductive wiring 12a is formed and an area where the conductive wiring 12b is formed. The distance D2 between the base substrates 311a and 311b is constant in the longitudinal direction of the base substrates 311a and 311b, and therefore the distance D1 between the conductive wirings 12a and 12b is constant in the direction in which the conductive wirings 12a and 12b extend, similar to that shown in FIG. 1.

[0075] 1, in the wiring sheet 310 of this embodiment, a connector 20 is attached to the end portion on the side of the resistance value detection terminals 13a, 13b, so that the conductive wires 12a, 12b are connected to the RFID tag 30 for use. Based on the resistance value detected by the RFID tag 30, the water level can be easily determined in the inspection device 50.

[0076] Furthermore, in this embodiment, the base substrate is divided into two regions, one in which the conductive wiring 12a is formed and the other in which the conductive wiring 12b is formed. As a result, when used to detect the water level as described above, it is possible to prevent the conductive wirings 12a and 12b from becoming conductive due to moisture remaining attached to the base substrate in the region in which the conductive wirings 12a and 12b are not immersed in moisture. In addition, even if rainwater or the like that is not a detection target adheres to the base substrates 311a and 311b, since the base substrates 311a and 311b are divided from each other, it is possible to prevent the conductive wirings 12a and 12b from becoming conductive due to the rainwater or the like that adheres to the base substrates 311a and 311b.

[0077] In the above-described embodiment, each of the two conductive wirings 12a, 12b, 112a, 112b, 212a, 212b formed on the base material 11, 311a, 311b has an area that increases from the end opposite the resistance value detection terminals 13a, 13b, 113a, 113b, 213a, 213b toward the end having the resistance value detection terminals 13a, 13b, 113a, 113b, 213a, 213b. However, it is sufficient that one of the two conductive wirings 12a, 12b, 112a, 112b, 212a, 212b has an area that increases from the end opposite the resistance value detection terminals 13a, 13b, 113a, 113b, 213a, 213b toward the end having the resistance value detection terminals 13a, 13b, 113a, 113b, 213a, 213b. Even in this case, the change in resistance value in the direction in which the conductive wirings 12a, 12b, 112a, 112b, 212a, 212b extend is large, and the water level can be easily determined.

[0078] In the above-mentioned embodiment, the area of ​​the two conductive wirings 12a, 12b, 112a, 112b, 212a, 212b formed on the base material 11, 311a, 311b increases from the end opposite to the resistance value detection terminals 13a, 13b, 113a, 113b, 213a, 213b toward the end having the resistance value detection terminals 13a, 13b, 113a, 113b, 213a, 213b. However, the thickness of the conductive wirings 12a, 12b, 112a, 112b, 212a, 212b may be changed by applying conductive ink on the base material 11, 311a, 311b in layers, etc. In that case, the thickness of the two conductive wirings formed on the base material increases from the end opposite to the resistance value detection terminal toward the end having the resistance value detection terminal. In this way, the volume of the two conductive wirings formed on the base material increases from the end opposite the resistance value detection terminal toward the end having the resistance value detection terminal.

[0079] In the above-described embodiment, the wiring sheet 10, 110, 310 is used to detect the water level. However, if the wiring sheet 10, 110, 310 is attached to an outdoor pipe, for example, when water leaks from the pipe and the moisture due to the water leak adheres between the two conductive wires, it is possible to determine in which area the two conductive wires are conductive based on the detected resistance value. This makes it possible to determine in which area of ​​the pipe the water leak is occurring. [Explanation of symbols]

[0080] 2 water 2a water surface 10,110,210,310 Wiring sheet 11,311a,311b Base material 12a,12b,112a,112b,212a,212b Conductive wiring 13a, 13b, 113a, 113b, 213a, 213b Resistance detection terminals 20 Connector 30 RFID tags 31 IC chip 32,51 Antenna 33 Resistance detection unit 34,52 Communications Department 40a, 40b Lead wire 50 Inspection Equipment 53 Resistance value acquisition unit 54 Water level judgment part

Claims

1. A base material; Each of the base members has a resistance value detection terminal at one end thereof, and has two conductive wirings formed at a distance from each other on one surface of the base member; A wiring sheet, wherein at least one of the two conductive wires increases in volume from the other end side toward the one end side.

2. The wiring sheet according to claim 1 , A wiring sheet, wherein the volume of at least one of the two conductive wirings increases stepwise from the other end side toward the one end side.

3. The wiring sheet according to claim 2 , A wiring sheet, wherein at least one of the two conductive wires has a stepped shape.

4. The wiring sheet according to claim 2 , At least one of the two conductive wires has a mesh pattern, and the mesh density increases from the other end side toward the one end side.

5. The wiring sheet according to claim 2 , A wiring sheet, wherein at least one of the two conductive wirings has a thickness that increases stepwise from the other end side toward the one end side.

6. The wiring sheet according to claim 1 , A wiring sheet in which the base substrate is divided into two areas, one in which one of the two conductive wirings is formed and the other in which the other conductive wiring is formed.

7. A detection sensor using the wiring sheet according to claim 1, a detection sensor having a resistance value detection means connected to the resistance value detection terminals of the two conductive wires, respectively, for detecting a resistance value between the resistance value detection terminals of the two conductive wires.

8. A detection system using the wiring sheet according to claim 2, a resistance value detection means connected to the resistance value detection terminals of the two conductive wirings, respectively, for detecting a resistance value between the resistance value detection terminals of the two conductive wirings; and determining means for determining at which of the steps the two conductive wires become conductive based on the resistance value detected by the resistance value detecting means.

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