Wiring sheet and detection sensor

Abstract

To easily determine whether any area between two conductive wirings is conducted by moisture.SOLUTION: A wiring sheet includes: a base material 11; two conductive wirings 12a and 12b including terminals 13a and 13b for detecting a resistance value at one end and formed at an interval on one surface of the base material 11; conductive layers 16a and 16b facing the two conductive wirings 12a and 12b and arranged in the state of contacting the conductive wirings 12a and 12b; and a cover sheet 14 arranged to cover the conductive layers 16a and 16b. The cover sheet 14 can partially separate the conductive layers 16a and 16b to the conductive wirings 12a and 12b by selecting a length from the other end side of the conductive wiring 12a and 12b.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a wiring sheet and a detection sensor.

Background Art

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

[0003] In recent years, it has also been considered to detect the water level of rivers and the like using such a technique. For example, resistance value detection means for detecting the resistance value between the two conductive wirings is connected to one end of each of the two conductive wirings. Then, based on the detected resistance value, it is determined in which region the two conductive wirings are conducting, that is, to what region the moisture has penetrated, thereby detecting the water level.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, as described above, in a case where resistance value detection means for detecting the resistance value between two conductive wirings is connected to one end of each of the two conductive wirings, and the water level is detected based on the detected resistance value, it may be difficult to detect a change in the resistance value due to the conduction location of the two conductive wirings. For example, when using a material with a high resistance value such as conductive carbon for the conductive wiring, even if the conduction location of the two conductive wirings changes, the change in the resistance value will be very small. Therefore, it becomes difficult to detect a change in the water level. In particular, the longer the length of the conductive wiring, the less likely it is for a change in the resistance value to occur on the other end side of the conductive wiring, and it becomes easier to have difficulty detecting a change in the water level.

[0006] In addition, since the change in the resistance value when the conduction location of the conductive wiring changes is very small, there is also a risk of misjudging that the water level has changed even when the resistance value slightly changes due to deterioration of the conductive wiring.

[0007] Such a problem occurs not only when detecting a change in the water level as described above, but also when determining whether moisture has occurred in any region in the length direction of the conductive wiring and the two conductive wirings are conducting in the region where the conductive wiring is arranged.

[0008] At this time, in the region where the conductive wiring is arranged, it is conceivable to provide a circuit for measuring the resistance value between the two conductive wirings in a plurality of regions in the length direction of the conductive wiring. However, since the region for detecting the occurrence of moisture varies depending on the application, the work becomes complicated.

[0009] The present invention has been made in view of the problems of the conventional technologies as described above, and an object thereof is to provide a wiring sheet and a detection sensor that can easily determine which region between two conductive wirings has been made conductive by moisture.

Means for Solving the Problems

[0010] To achieve the above object, the present invention a base substrate, Each has a resistance value detection terminal at one end, and two first conductive wirings formed on one surface of the base substrate with a space therebetween, a second conductive wiring facing at least one of the two first conductive wirings and disposed in contact with the first conductive wiring, and a coating sheet disposed to cover the second conductive wiring. The coating sheet is a wiring sheet that allows the second conductive wiring to be partially separated from the first conductive wiring by selecting the length from the other end side of the first conductive wiring with respect to the first conductive wiring.

[0011] In the present invention configured as described above, at least one of the two first conductive wirings formed on the base substrate and each having a resistance value detection terminal at one end is opposed to the second conductive wiring in a state of being in contact therewith, and the coating sheet disposed to cover the second conductive wiring allows the second conductive wiring to be partially separated from the first conductive wiring by selecting the length from the other end side of the first conductive wiring. Therefore, by partially separating the second conductive wiring from the first conductive wiring, the resistance value can be made significantly different between the portion where the second conductive wiring is in contact with the first conductive wiring and the portion where the second conductive wiring is separated from the first conductive wiring. As a result, when the two first conductive wirings are electrically connected by moisture at the portion where the second conductive wiring of the first conductive wiring is in contact, and when the two first conductive wirings are electrically connected by moisture at the portion where the second conductive wiring of the first conductive wiring is separated, the resistance value between the resistance value detection terminals of the two first conductive wirings detected via the resistance value detection terminals will be significantly different, and it is possible to easily determine which region between the two first conductive wirings arranged in parallel is electrically connected by moisture. At that time, it is only necessary to select a length corresponding to the application from the other end side of the first conductive wiring and partially separate it, and the work will not become complicated.

[0012] Further, the coating sheet may be configured to have a shape that exposes the base substrate between the two first conductive wirings. In such a configuration, moisture is likely to adhere to the region between the first conductive wirings of the base substrate.

[0013] Further, the base substrate and the coating sheet may be formed of a single sheet. Thereby, the configuration is simplified.

[0014] Further, the second conductive wiring may be configured to be detachably adhered to the opposing first conductive wiring. In such a configuration, while the second conductive wiring can be surely brought into contact with the first conductive wiring, the second conductive wiring can be partially separated from the first conductive wiring.

[0015] Further, the base substrate may be configured to be divided into two in a region where one of the two first conductive wirings is formed and a region where the other first conductive wiring is formed. In such a configuration, when detecting the water level, it is possible to avoid the two first conductive wirings being electrically connected by the moisture remaining adhered to the base substrate in a region where the first conductive wiring is not immersed in the moisture. Also, it is possible to avoid rainwater or the like that is not the detection target from adhering between the two first conductive wirings on the base substrate and the two first conductive wirings being electrically connected by the rainwater or the like.

[0016] Further, as the detection sensor using the wiring sheet, it may be configured to include resistance value detection means that are respectively connected to the resistance value detection terminals of the two first conductive wirings and detect the resistance value between the resistance value detection terminals of the two first conductive wirings.

Advantages of the Invention

[0017] According to the present invention, when the two first conductive wirings are electrically connected by moisture at the portion where the second conductive wiring of the first conductive wiring is in contact, and when the two first conductive wirings are electrically connected by moisture at the portion where the second conductive wiring of the first conductive wiring is separated, the resistance value between the resistance value detection terminals of the two first conductive wirings detected via the resistance value detection terminals will be significantly different, and it is possible to easily determine which region between the two first conductive wirings is electrically connected by moisture.

[0018] In addition, in the case where the coating sheet has a shape that exposes the base substrate between the two first conductive wirings, moisture is likely to adhere to the region between the first conductive wirings of the base substrate.

[0019] In addition, in the case where the base substrate and the coating sheet are composed of a single sheet, the configuration is simplified.

[0020] In addition, in the case where the second conductive wiring is detachably adhered to the opposing first conductive wiring, while the second conductive wiring can be surely brought into contact with the first conductive wiring, the second conductive wiring can be partially separated from the first conductive wiring.

[0021] In addition, in the case where the base substrate is divided into two in the region where one of the two first conductive wirings is formed and the region where the other first conductive wiring is formed, when detecting the water level, it is possible to avoid the two first conductive wirings being electrically connected by the moisture remaining attached to the base substrate in the region where the first conductive wiring is not immersed in moisture. Also, it is possible to avoid rainwater or the like that is not a detection target from adhering between the two first conductive wirings on the base substrate and the two first conductive wirings being electrically connected by the rainwater or the like.

Brief Description of the Drawings

[0022]

Figure 1

Figure 2

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Mode for Carrying Out the Invention

[0023] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0024] (First Embodiment) 〈Configuration of Wiring Sheet〉 FIG. 1 is a diagram showing a first embodiment of a wiring sheet of the present invention, (a) is a diagram showing the surface configuration, (b) is a cross-sectional view taken along line A-A shown in (a), (c) is a diagram showing the configuration on the base substrate 11, and (d) is a diagram showing the configuration of the back surface of the coating sheet 14.

[0025] As shown in FIG. 1, in the present embodiment, a wiring sheet 10 is configured by laminating a coating sheet 14 on one surface of a base substrate 11.

[0026] The base substrate 11 is made of an insulating material such as a film and has a long rectangular shape. The base substrate 11 preferably has water resistance. On the lamination surface of the base substrate 11 with the coating sheet 14, two conductive wirings 12a and 12b are formed.

[0027] The conductive wirings 12a and 12b are examples of the first conductive wiring in the present invention. The conductive wirings 12a and 12b extend in parallel in the longitudinal direction of the base substrate 11 with a space therebetween on one surface of the base substrate 11, and resistance value detection terminals 13a and 13b are respectively provided at one end in the direction in which the conductive wirings 12a and 12b extend.

[0028] The covering sheet 14 has the same shape as the base substrate 11 and is made of a material that can be easily torn by hand. On the laminated surface of the covering sheet 14 with the base substrate 11, conductive layers 16a and 16b are laminated. The conductive layers 16a and 16b are laminated so as to face the conductive wirings 12a and 12b, thereby constituting an example of the second conductive wiring in the present invention. Note that the conductive layers 16a and 16b are not limited to being laminated on the laminated surface of the covering sheet 14 with the base substrate 11, and may be laminated on the conductive wirings 12a and 12b as long as they cover the conductive wirings 12a and 12b. In the covering sheet 14, perforations 15 parallel to the conductive layers 16a and 16b are formed between the conductive layers 16a and 16b.

[0029] The base substrate 11 and the covering sheet 14 configured as described above are laminated such that the surface of the base substrate 11 on which the conductive wirings 12a and 12b are formed faces the surface of the covering sheet 14 on which the conductive layers 16a and 16b are laminated, and are adhesively attached to each other by an adhesive layer 17 so as to be peelable. As a result, the conductive wiring 12a and the conductive layer 16a are in contact with each other and electrically conductive, and the conductive wiring 12b and the conductive layer 16b are in contact with each other and electrically conductive. The adhesive layer 17 may, for example, adhere the base substrate 11 and the covering sheet 14 in an outer region between the conductive wirings 12a and 12b. In the wiring sheet 10 formed by laminating the base substrate 11 and the covering sheet 14 in this way, since the perforations 15 are formed between the conductive layers 16a and 16b of the covering sheet 14, the base substrate 11 is exposed through the cut portion of the perforations 15 between the two conductive wirings 12a and 12b. Note that the covering sheet 14 may be configured without the perforations 15. However, if the perforations 15 are formed in the covering sheet 14, moisture is likely to adhere to the region between the conductive wirings 12a and 12b of the base substrate 11.

[0030] Note that the conductive wirings 12a and 12b may be made of conductive carbon. Since conductive carbon has high chemical resistance and is difficult to oxidize, when the wiring sheet 10 is used for moisture detection as described later, it has excellent durability and can stably detect moisture.

[0031] <Usage form of wiring sheet 10> The wiring sheet 10 configured as described above can be used, for example, to detect the water level in a river or the like.

[0032] 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 the functional configuration of the RFID tag 30 shown in FIG. 2. FIG. 4 is a block diagram showing the functional configuration of the inspection device 50 shown in FIG. 2.

[0033] When the wiring sheet 10 shown in FIG. 1 is used to detect the water level as described later, as shown in FIG. 2, a connection connector 20 is attached to the ends on the side of the resistance value detection terminals 13a and 13b of the wiring sheet 10. At that time, the coating sheet 14 may be rolled up so that the resistance value detection terminals 13a and 13b are exposed, or the coating sheet 14 may be torn so that the resistance value detection terminals 13a and 13b are exposed because the coating sheet 14 is made of a material that can be easily torn by hand.

[0034] The connection connector 20 is provided with two connection terminals (not shown) inside. When the connection connector 20 is attached to the wiring sheet 10 with the resistance value detection terminals 13a and 13b exposed, the connection terminals of the connection connector 20 are electrically connected to the resistance value detection terminals 13a and 13b. Further, the connection terminals of the connection connector 20 are electrically connected to the lead wires 40a and 40b connected to the RFID tag 30. Thereby, by attaching the connection 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 connection connector 20 and the lead wires 40a and 40b. In this way, by electrically connecting the RFID tag 30 to the wiring sheet 10, an example of the detection sensor of the present invention is configured.

[0035] As shown in FIG. 3, the RFID tag 30 has an IC chip 31 and an antenna 32.

[0036] The IC chip 31 is connected to the conductive wirings 12a and 12b via lead wires 40a and 40b and a connection connector 20, and includes a resistance value detection unit 33 and a communication unit 34.

[0037] The resistance value detection unit 33 is an example of the 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 and 13b via the lead wires 40a and 40b and the connection connector 20.

[0038] The communication unit 34 non - contact transmits the resistance value detected by the resistance value detection unit 33 via the antenna 32.

[0039] With the connection 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 non - contact transmitted via the communication unit 34 and the antenna 32 and acquired by the inspection device 50.

[0040] The inspection device 50 includes 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 handy terminal - type reader / writer capable of reading information from the RFID tag 30 in a non - contact state.

[0041] The communication unit 52 reads and writes information by performing non - contact communication with the RFID tag 30 via the antenna 51.

[0042] The resistance value acquisition unit 53 acquires the resistance value detected by the resistance value detection unit 33 through non - contact communication with the RFID tag 30 via the communication unit 52.

[0043] The water level determination unit 54 determines the water level by determining in which region the conductive wirings 12a and 12b are conducting based on the resistance value acquired by the resistance value detection unit 33.

[0044] <Method for Detecting Water Level> A method for detecting water level using the detection system configured as described above will be described below.

[0045] FIG. 5 is a diagram for explaining a method for detecting water level using the detection system shown in FIG. 2.

[0046] When detecting the water level with the detection system shown in FIG. 2, as shown in FIG. 5, the wiring sheet 10 is arranged in the area where the water level is to be detected. At this time, the wiring sheet 10 is arranged such that the end side to which the connection connector 20 is attached is on the upper side.

[0047] In this state, as shown in FIG. 5, when the conductive wirings 12a and 12b are immersed in the water 2 by an amount corresponding to the water level, the water 2 enters between the base substrate 11 and the coating sheet 14 from the cut portion of the perforation 15, and the conductive wirings 12a and 12b are short-circuited and conduct through the water 2 between the contact point of the conductive wiring 12a in contact with the water surface 2a and the contact point of the conductive wiring 12b.

[0048] Therefore, when a current is supplied from the inspection device 50 to the conductive wirings 12a and 12b via the RFID tag 30 in this state, a current flows through the conductive wirings 12a and 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 through the respective contact points of the conductive wirings 12a and 12b with the water surface 2a is detected. At this time, since the conductive layers 16a and 16b of the conductive wirings 12a and 12b are conducting, the detected resistance value includes the resistance value from the portion of the conductive layer 16a facing the resistance value detection terminal 13a of the conductive wiring 12a to the portion of the conductive layer 16a facing the contact point of the conductive wiring 12a with the water surface 2a through the portion of the conductive layer 16b facing the contact point of the conductive wiring 12b with the water surface 2a to the portion of the conductive layer 16a facing the resistance value detection terminal 13a.

[0049] The resistance value detected by the resistance value detection unit 33 is non - contact transmitted 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 the communication unit 52 of the inspection device 50.

[0050] 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.

[0051] FIG. 6 is a diagram showing the change in the resistance value according to the water level when the two conductive wirings 12a and 12b are electrically connected by water with the covering sheet 14 in the wiring sheet 10 shown in FIG. 1 in its original form.

[0052] As shown in FIG. 5, when detecting the water level with the covering sheet 14 of the wiring sheet 10 in its original form, as shown in FIG. 6, even if the water level changes, the change in the resistance value from the resistance value detection terminal 13a of the conductive wiring 12a to the resistance value detection terminal 13a through the contact points of the conductive wirings 12a and 12b with the water surface 2a may be very small. In that case, it becomes difficult to detect the change in the water level.

[0053] Therefore, by partially tearing off the covering sheet 14 in the wiring sheet 10 shown in FIG. 1, a region where the detected resistance value changes greatly is generated.

[0054] FIG. 7 is a diagram showing an example of a form for easily detecting a change in the water level in the detection system shown in FIG. 2.

[0055] In the detection system shown in FIG. 2, for example, as shown in FIG. 7, a part of the portion of the covering sheet 14 facing the conductive wiring 12a may be torn off. As a result, a part of the conductive layer 16a is separated from the conductive wiring 12a.

[0056] Then, the wiring sheet 10 has a region R1 where the conductive wiring 12a is in contact with the conductive layer 16a facing each other, and a region R2 where the conductive layer 16a is separated from the conductive wiring 12a and the conductive wiring 12a is exposed. And the resistance value on the conductive wiring 12a side in the region R1 is the combined value of the conductive wiring 12a and the conductive layer 16a. On the other hand, the resistance value on the conductive wiring 12a side in the region R2 is the resistance value of only the conductive wiring 12a due to the separation of the conductive layer 16a. Thereby, the resistance value between the resistance detection terminals 13a and 13b when the conductive wiring 12a and the conductive wiring 12b are electrically connected in the region R1 is significantly different from the resistance value between the resistance detection terminals 13a and 13b when the conductive wiring 12a and the conductive wiring 12b are electrically connected in the region R2.

[0057] FIG. 8 is a diagram showing the change in the resistance value according to the water level when the two conductive wirings 12a and 12b are electrically connected by water in the form shown in FIG. 7.

[0058] When the two conductive wirings 12a and 12b are electrically connected by water in the form shown in FIG. 7, the resistance value detected by the RFID tag 30 changes significantly when the electrically connected portion is the boundary portion P1 between the regions R1 and R2. Specifically, the resistance value on the conductive wiring 12a side in the region R1 is low because it is the combined value of the conductive wiring 12a and the conductive layer 16a. On the other hand, the resistance value on the conductive wiring 12a side in the region R2 becomes high because it is the resistance value of only the conductive wiring 12a due to the separation of the conductive layer 16a.

[0059] And because the resistance values of these regions R1 and R2 are significantly different from each other, the resistance value range r1 of the resistance value when the conductive wirings 12a and 12b are electrically connected by contacting the water surface 2a in the region R1 is significantly different from the resistance value range r2 of the resistance value when the conductive wirings 12a and 12b are electrically connected by contacting the water surface 2a in the region R2.

[0060] In the water level determination unit 54, the assumed water level is calculated according to the length of each of the regions R1 and R2. For example, when the length of the region R1 is 250 mm and the length of the region R2 is 1500 mm, if the wiring sheet 10 is installed such that the ends on the side opposite to the resistance value detection terminals 13a and 13b of the conductive wirings 12a and 12b overlap the region where the water level is 0, it is calculated that the region R2 corresponds to the water level from 0 to 1500 mm, and the region R1 corresponds to the water level from 1500 to 1750 m. Note that in order for the water level determination unit 54 to make such a determination, it is preferable to form a perforation or display a torn portion at the boundary between the region R1 and the region R2 to indicate the torn portion of the coating sheet 14.

[0061] Then, in the water level determination unit 54, the resistance value range r1 of the resistance value detected when the conductive wirings 12a and 12b are conductive in the region R1 where the coating sheet 14 has not been torn off, and the water level range when the detected resistance value is within the resistance value range r1 are associated with each other in the database. Also, the resistance value range r2 of the resistance value detected when the conductive wirings 12a and 12b are conductive with only the conductive wiring 12a exposed in the region R2, and the water level range when the detected resistance value is within the resistance value range r2 are associated with each other in the database.

[0062] Therefore, in the water level determination unit 54, the water level can be determined 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 r2, the water level determination unit 54 can determine that the water level range is D2. Also, 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.

[0063] FIG. 9 is a diagram showing another example of a form for easily detecting a change in the water level in the detection system shown in FIG. 2.

[0064] In the detection system shown in FIG. 2, for example, as shown in FIG. 9, in addition to a part of the portion of the coating sheet 14 facing the conductive wiring 12a, a part of the portion facing the conductive wiring 12b may be cut off. As a result, a part of the conductive layer 16a is separated from the conductive wiring 12a, and a part of the conductive layer 16b is separated from the conductive wiring 12b. At this time, it is preferable that the length of the part cut off from the portion facing the conductive wiring 12a is different from the length of the part cut off from the portion facing the conductive wiring 12b.

[0065] Then, the wiring sheet 10 has a region R1 where the conductive wirings 12a and 12b are in contact with the conductive layers 16a and 16b facing each other, a region R2 where the conductive layer 16a is separated from the conductive wiring 12a and the conductive wiring 12a is exposed while the conductive wiring 12b is in contact with the conductive layer 16b facing each other, and a region R3 where the conductive layers 16a and 16b are separated from the conductive wirings 12a and 12b and both the conductive wirings 12a and 12b are exposed. The resistance value in the region R1 is such that the conductive wiring 12a side is the combination of the conductive wiring 12a and the conductive layer 16a, and the conductive wiring 12b side is also the combination of the conductive wiring 12b and the conductive layer 16b. Also, the resistance value in the region R2 is such that the conductive wiring 12a side becomes the resistance value of only the conductive wiring 12a due to the separation of the conductive layer 16a, and the conductive wiring 12b side is the combination of the conductive wiring 12b and the conductive layer 16b. Further, the resistance value in the region R3 is such that the conductive wiring 12a side becomes the resistance value of only the conductive wiring 12a due to the separation of the conductive layer 16a, and the conductive wiring 12b side also becomes the resistance value of only the conductive wiring 12b due to the separation of the conductive layer 16b. As a result, the resistance value between the resistance detection terminals 13a and 13b when the conductive wiring 12a and the conductive wiring 12b are conductive in the region R1, the resistance value between the resistance detection terminals 13a and 13b when the conductive wiring 12a and the conductive wiring 12b are conductive in the region R2, and the resistance value between the resistance detection terminals 13a and 13b when the conductive wiring 12a and the conductive wiring 12b are conductive in the region R3 are significantly different.

[0066] FIG. 10 is a diagram showing the change in resistance value according to the water level when the two conductive wirings 12a and 12b are electrically connected by water in the form shown in FIG. 9.

[0067] When the two conductive wirings 12a and 12b are electrically connected by water in the form shown in FIG. 9, the resistance value detected by the RFID tag 30 changes greatly when the electrically connected portion is at the boundary portions P1 and P2 of the regions R1 to R3. Specifically, the resistance value in the region R1 is the lowest because the conductive wiring 12a side is the combination of the conductive wiring 12a and the conductive layer 16a, and the conductive wiring 12b side is also the combination of the conductive wiring 12b and the conductive layer 16b. Also, the resistance value in the region R2 is the second lowest because the conductive wiring 12a side becomes the resistance value of only the conductive wiring 12a due to the separation of the conductive layer 16a, and the conductive wiring 12b side is the combination of the conductive wiring 12b and the conductive layer 16b. Further, the resistance value in the region R3 is the highest because the conductive wiring 12a side becomes the resistance value of only the conductive wiring 12a due to the separation of the conductive layer 16a, and the conductive wiring 12b side also becomes the resistance value of only the conductive wiring 12b due to the separation of the conductive layer 16b.

[0068] And because the resistance values of these regions R1 to R3 are significantly different from each other, the resistance value range r1 of the resistance value when the conductive wirings 12a and 12b are electrically connected by contacting the water surface 2a in the region R1, the resistance value range r2 of the resistance value when the conductive wirings 12a and 12b are electrically connected by contacting the water surface 2a in the region R2, and the resistance value range r3 of the resistance value when the conductive wirings 12a and 12b are electrically connected by contacting the water surface 2a in the region R3 are significantly different.

[0069] In the water level determination unit 54, the assumed water level is calculated according to the length of each of the regions R1 to R3. For example, when the length of the region R1 is 250 mm, the length of the region R2 is 500 mm, and the length of the region R3 is 1000 mm, if the wiring sheet 10 is installed such that the end portions on the side opposite to the resistance value detection terminals 13a and 13b of the conductive wirings 12a and 12b overlap the region where the water level is 0, it is calculated that the region R3 corresponds to the water level of 0 to 1000 mm, the region R2 corresponds to the water level of 1000 to 1500 m, and the region R1 corresponds to the water level of 1500 to 1750 mm. In addition, in order for the water level determination unit 54 to make such a determination, it is preferable to form perforations or display a torn portion at the boundary portions of the regions R1 to R3 to indicate the torn portion of the coating sheet 14.

[0070] Then, in the water level determination unit 54, the resistance value range r1 of the resistance value detected when the conductive wirings 12a and 12b are conductive in the region R1 where the coating sheet 14 has not been torn off, and the water level range when the detected resistance value is within the resistance value range r1 are associated with each other in the database. Also, the resistance value range r2 of the resistance value detected when the conductive wirings 12a and 12b are conductive with only the conductive wiring 12a exposed in the region R2, and the water level range when the detected resistance value is within the resistance value range r2 are associated with each other in the database. Further, the resistance value range r3 of the resistance value detected when the conductive wirings 12a and 12b are conductive with both of the conductive wirings 12a and 12b exposed in the region R3, and the water level range when the detected resistance value is within the resistance value range r3 are associated with each other in the database.

[0071] Therefore, in the water level determination unit 54, the water level can be determined 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 r3, the water level determination unit 54 can determine that the water level range is D3. Further, 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. Further, 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.

[0072] Thus, in the present embodiment, the conductive layers 16a and 16b are made to face and conduct with the conductive wirings 12a and 12b, and by tearing off a part of the coating sheet 14, the length from the end side opposite to the resistance value detection terminals 13a and 13b of the conductive wirings 12a and 12b is selected so that the conductive layers 16a and 16b can be partially separated. Thereby, when the conductive wirings 12a and 12b are conducted by water, the resistance value between the resistance value detection terminals 13a and 13b can be made significantly different between the region where the conductive layers 16a and 16b face and conduct with the conductive wirings 12a and 12b, the region where only one of the conductive wirings 12a and 12b faces and conducts with the conductive layer, and the region where the conductive layers 16a and 16b are separated from the conductive wirings 12a and 12b, and it is possible to easily determine up to which regions R1 and R2 between the conductive wirings 12a and 12b are immersed in water, that is, the water level.

[0073] Further, in the present embodiment, the resistance value between the conductive wirings 12a and 12b is detected by the RFID tag 30, and for example, by transmitting flag information corresponding to this resistance value to the inspection device 50, the conduction state between the conductive wirings 12a and 12b is determined. However, the means for wirelessly transmitting the resistance value between the conductive wirings 12a and 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.

[0074] (Second Embodiment) FIG. 11 is a diagram showing a second embodiment of the wiring sheet of the present invention, (a) is a diagram showing the configuration of the surface, (b) is a cross-sectional view taken along line A-A shown in (a), (c) is a diagram showing the configuration on the base substrate 11, and (d) is a diagram showing the configuration of the back surface of the coating sheet 14.

[0075] As shown in FIG. 11, in this embodiment, the wiring sheet 110 is different from that shown in FIG. 1 in that the base substrate 11 and the coating sheet 14 are adhered by the conductive adhesive layers 116a and 116b.

[0076] In this embodiment, the conductive adhesive layers 116a and 116b are laminated on the conductive wirings 112a and 112b formed on one surface of the base substrate 11, and the base substrate 11 and the coating sheet 14 are detachably adhered by the conductive adhesive layers 116a and 116b. Thereby, the conductive adhesive layers 116a and 116b constitute the second conductive wiring in the present invention. The conductive adhesive layers 116a and 116b have conductivity by including a conductive substance and enable peeling after adhesion. Thereby, the conductive wiring 112a is electrically connected to the conductive adhesive layer 116a by contacting the conductive adhesive layer 116a, and the conductive wiring 112b is electrically connected to the conductive adhesive layer 116b by contacting the conductive adhesive layer 116b. Note that the conductive adhesive layers 116a and 116b may be laminated on the back surface of the coating sheet 14 or may be laminated on the conductive adhesive layers 116a and 116b.

[0077] Also in the wiring sheet 110 configured as described above, similar to that shown in FIG. 1, by selecting and partially cutting off the coating sheet 14 from the end opposite to the resistance value detection terminals 113a and 113b, a region where the resistance values are greatly different from each other can be generated. Then, the water level can be easily determined using the greatly different resistance values.

[0078] In addition, since the conductive adhesive layers 116a and 116b are detachably attached to the conductive wirings 112a and 112b, it is possible to ensure that the conductive adhesive layers 116a and 116b are in contact with the conductive wirings 112a and 112b, while also being able to partially separate the conductive adhesive layers 116a and 116b from the conductive wirings 112a and 112b.

[0079] (Third Embodiment) FIG. 12 is a diagram showing a third embodiment of the wiring sheet of the present invention, (a) is a diagram showing the surface configuration, (b) is a cross-sectional view taken along line A-A shown in (a), and (c) is a diagram showing a state in which the base substrate 211 is laid out flat.

[0080] As shown in FIG. 12, in the present embodiment, the wiring sheet 210 is different from that shown in FIG. 1 in that the base substrate 211 also serves as a coating sheet, and the same conductive adhesive layers 216a and 216b as those shown in FIG. 11 are used as the second conductive wirings.

[0081] In this embodiment, the base substrate 211 also serves as a coating sheet when it is folded. That is, the base substrate and the coating sheet are formed from a single sheet. Similar to those shown in FIG. 1, two conductive wirings 12a and 12b having resistance value detection terminals 13a and 13b at one end are formed in parallel with a space therebetween on the base substrate 211. Further, a conductive adhesive layer 216a is laminated in parallel with the conductive wiring 12a on the side opposite to the conductive wiring 12b of the conductive wiring 12a, and a conductive adhesive layer 216b is laminated in parallel with the conductive wiring 12b on the side opposite to the conductive wiring 12a of the conductive wiring 12b. Then, with the portions between the conductive wiring 12a and the conductive adhesive layer 216a and between the conductive wiring 12b and the conductive adhesive layer 216b as folding portions, the base substrate 211 is folded so that the conductive wirings 12a and 12b and the conductive adhesive layers 216a and 216b face each other and come into contact. As a result, the conductive wiring 12a and the conductive adhesive layer 216a are electrically connected, and the conductive wiring 12b and the conductive adhesive layer 216b are electrically connected. Also, the end sides along the conductive adhesive layers 216a and 216b of the base substrate 211 have a gap 215 without contacting each other, and the region between the conductive wirings 12a and 12b of the base substrate 211 is exposed from this gap 215.

[0082] Also in the wiring sheet 210 configured as described above, similar to that shown in FIG. 1, by selectively cutting off a part of the portion of the base substrate 211 that constitutes the coating sheet, that is, the region where the conductive adhesive layers 216a and 216b are laminated, from the end opposite to the resistance value detection terminals 13a and 13b, regions having significantly different resistance values can be generated. Then, the water level can be easily determined using the significantly different resistance values.

[0083] Further, since the base substrate and the coating sheet are formed from a single sheet, the configuration is simplified.

[0084] (Fourth Embodiment) FIG. 13 is a diagram showing a fourth embodiment of the wiring sheet of the present invention, (a) is a diagram showing the surface configuration, (b) is a cross-sectional view taken along line A-A shown in (a), (c) is a diagram showing the configuration on the base substrate 11, and (d) is a diagram showing the configuration of the back surface of the coating sheet 314.

[0085] As shown in FIG. 11, this embodiment is a wiring sheet 310 in which the configuration of the coating sheet 314 is different from that shown in FIG. 11.

[0086] In the coating sheet 314 in this embodiment, perforations 317a and 317b are formed in parallel with the perforation 15 on both sides of the perforation 15. Also in this embodiment, although the conductive adhesive layers 316a and 316b are laminated so as to face the conductive wirings 112a and 112b, the conductive adhesive layers 316a and 316b may not be laminated in the regions where the perforations 317a and 317b are formed.

[0087] FIG. 14 is a diagram showing an example of the usage method of the wiring sheet 310 shown in FIG. 13.

[0088] As described above, in the wiring sheet 310 shown in FIG. 13, in the coating sheet 314, perforations 317a and 317b are formed in parallel with the perforation 15 on both sides of the perforation 15. Therefore, the coating sheet 314 can be easily torn using these perforations 317a and 317b.

[0089] When tearing the coating sheet 314 using the perforations 317a and 317b, since the perforations 317a and 317b are parallel to the perforation 15, the width of the conductive adhesive layers 316a and 316b can be selected to be separated from the conductive wirings 112a and 112b.

[0090] For example, as shown in FIG. 14, in region R5, the conductive adhesive layer 316a is separated from the conductive wiring 112a by cutting off the region of the covering sheet 314 that is on the side of the conductive wiring 112a through the perforation 15. Further, in region R6, in addition to the same configuration as region R5, a part of the conductive adhesive layer 316b is separated from the conductive wiring 112b by cutting off the region of the covering sheet 314 that is on the side of the conductive wiring 112b through the perforation 15 and is on the side of the conductive wiring 112a through the perforation 317b. Further, in region R7, the entire covering sheet 314 is cut off, so that the conductive adhesive layers 316a and 316b are separated from the conductive wirings 112a and 112b. As a result, the resistance value in region R4 is the combined value of the conductive wirings 112a and 112b and the conductive adhesive layers 316a and 316b. Further, the resistance value in region R5 is the combined value of the conductive wirings 112a and 112b and the conductive adhesive layer 316b. Further, the resistance value in region R6 is the combined value of the conductive wirings 112a and 112b and about half of the conductive adhesive layer 316b. Further, the resistance value in region R7 consists only of the conductive wirings 112a and 112b. As a result, the resistance value between the resistance detection terminals 113a and 113b when the conductive wiring 112a and the conductive wiring 112b are electrically connected in region R4, the resistance value between the resistance detection terminals 113a and 113b when the conductive wiring 112a and the conductive wiring 112b are electrically connected in region R5, the resistance value between the resistance detection terminals 113a and 113b when the conductive wiring 112a and the conductive wiring 112b are electrically connected in region R6, and the resistance value between the resistance detection terminals 113a and 113b when the conductive wiring 112a and the conductive wiring 112b are electrically connected in region R7 are significantly different from each other.

[0091] Therefore, in the wiring sheet 310 in the present embodiment, by selecting and cutting off the covering sheet 314 so that the conductive adhesive layers 316a and 316b are partially separated from the conductive wirings 112a and 112b, regions with significantly different resistance values can be generated. Then, the water level can be easily determined using the significantly different resistance values.

[0092] (Fifth Embodiment) FIG. 15 is a diagram showing a fifth embodiment of the wiring sheet of the present invention, where (a) is a diagram showing the surface configuration, (b) is a cross-sectional view taken along line A-A shown in (a), (c) is a diagram showing the configuration on the base substrates 411a and 411b, and (d) is a diagram showing the configuration of the back surface of the coating sheets 414a and 414b.

[0093] As shown in FIG. 15, this embodiment is a wiring sheet 410 that is different from the one shown in FIG. 1 in that it has two base substrates 411a and 411b and two coating sheets 414a and 414b. Conductive wiring 12a is formed on one surface of the base substrate 411a, and conductive wiring 12b is formed on one surface of the base substrate 411b. That is, in the one shown in FIG. 1, the base substrate is divided into two in the region where the conductive wiring 12a is formed and the region where the conductive wiring 12b is formed. The coating sheets 414a and 414b each have the same shape as the base substrates 411a and 411b, are laminated on the base substrates 411a and 411b, and are adhered by the adhesive layer 17.

[0094] Also in the wiring sheet 410 configured as described above, similar to the wiring sheet 10 shown in FIG. 1, by selectively tearing off the coating sheets 414a and 414b partially by selecting the length from the end opposite to the resistance value detection terminals 13a and 13b, regions with significantly different resistance values can be generated. And the water level can be easily determined using the significantly different resistance values.

[0095] Furthermore, in the present embodiment, the base substrate is divided into two parts, namely, the region where the conductive wiring 12a is formed and the region where the conductive wiring 12b is formed. Thereby, when used for detecting the water level as described above, it is possible to avoid the conductive wirings 12a and 12b from being electrically connected by the moisture remaining attached to the base substrate in the region where the conductive wirings 12a and 12b are not immersed in the moisture. Also, even if rainwater or the like that is not the detection target adheres to the base substrates 411a and 411b, since the base substrates 411a and 411b are divided from each other, it is also possible to avoid the conductive wirings 12a and 12b from being electrically connected by the rainwater or the like adhering to the base substrates 411a and 411b.

[0096] In the above-described embodiment, the conductive layers 16a and 16b and the conductive adhesive layers 116a, 116b, 216a, 216b, 316a, and 316b face each of the two conductive wirings 12a, 12b, 112a, and 112b formed on the base substrates 11, 211, 411a, and 411b. However, it is sufficient that the conductive layer or the conductive adhesive layer faces one of the two conductive wirings 12a, 12b, 112a, and 112b. Even in that case, by partially tearing off the coating sheet, the conductive layer or the conductive adhesive layer can be partially separated from the opposing conductive wiring, and the change in the resistance value in the direction in which the conductive wirings 12a, 12b, 112a, and 112b extend becomes large, making it possible to easily determine the water level.

[0097] Also, in the above-described embodiment, the case of detecting the water level using the wiring sheets 10, 110, 310, and 410 has been described as an example. However, if the wiring sheets 10, 110, 310, and 410 are attached to, for example, an outdoor pipe, when water leakage occurs from the pipe and moisture due to the water leakage adheres between the two conductive wirings, it is possible to determine in which region the two conductive wirings are electrically connected based on the detected resistance value. Thereby, it is possible to determine in which region of the pipe the water leakage is occurring.

Description of Reference Numerals

[0098] 2 Water 2a Water surface 10,110,210,310,410 Wiring sheet 11,211,411a,411b Base substrate 12a,12b,112a,112b Conductive wiring 13a,13b,113a,113b Resistance detection terminal 14,314,414a,414b Coating sheet 15,317a,317b Perforation 16a,16b Conductive layer 17 Adhesive layer 20 Connection connector 30 RFID tag 31 IC chip 32,51 Antenna 33 Resistance detection unit 34,52 Communication unit 40a,40b Lead wire 50 Inspection device 53 Resistance value acquisition unit 54 Water level judgment unit 116a,116b,216a,216b,316a,316b Conductive adhesive layer 215 Gap

Claims

1. A base substrate, Two first conductive wirings each having a resistance value detection terminal at one end and formed on one surface of the base substrate with a space therebetween, A second conductive wiring facing at least one of the two first conductive wirings and arranged in contact with the first conductive wiring, And a coating sheet arranged to cover the second conductive wiring, The coating sheet is a wiring sheet that allows the second conductive wiring to be partially separated from the first conductive wiring by selecting the length from the other end side of the first conductive wiring.

2. In the wiring sheet according to Claim 1, The coating sheet has a shape that exposes the base substrate between the two first conductive wirings.

3. In the wiring sheet according to Claim 1, The base substrate and the coating sheet are composed of one sheet.

4. In the wiring sheet according to Claim 1, The second conductive wiring is detachably attached to the opposing first conductive wiring.

5. In the wiring sheet according to Claim 1, The base substrate is divided into two in a region where one of the two first conductive wirings is formed and a region where the other first conductive wiring is formed.

6. A detection sensor using the wiring sheet according to Claim 1, And resistance value detection means connected to the resistance value detection terminals of the two first conductive wirings respectively to detect the resistance value between the resistance value detection terminals of the two first conductive wirings.

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