JP2006201068A - Moisture detecting member, and water leakage detection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow easy attachment in an optional position of a pipe or the like at a low cost, and to detect water leakage in the pipe or the like. <P>SOLUTION: An antenna part 20, comprising two bandlike conductors 21a, 21b formed with an air gap each other, is formed on a base material 30, an IC chip 10 capable of reading out information under noncontact conditions is mounted to be connected to areas facing each other in the two conductors 21a, 21b, and an adhesive 40 is applied further on a face formed with the antenna part 20 of the base material 30 so as to surround the antenna part 20 and the IC chip 10. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a moisture detection member for detecting moisture and a leakage detection method for detecting leakage.

  Conventionally, in apartment buildings such as condominiums and general buildings, pipes used for air conditioning and the like have been arranged between the ceiling and between walls, and this pipe can be used to supply fluids such as water. Emissions are taking place. Since such a pipe is disposed between the ceiling and between the walls as described above, it is connected using a joining member such as a joint according to the structure of the building. However, although the joint portion or the like is sealed with silicon or the like, water leakage may occur if the sealing is incomplete.

Here, a water leakage detection sensor for detecting water leakage is considered. For example, leakage is detected when a plurality of conductors are surrounded by an absorbent material, and power is supplied to each of the conductors, and when the fluid is absorbed by the absorbent material and the conductor is conducted by absorbing the leaked fluid. A detection sensor is considered (for example, refer to Patent Document 1). Therefore, if such a water leakage detection sensor is attached to the joint portion of the pipe, the water leak at the joint portion of the pipe can be detected.
Japanese Patent Laid-Open No. 11-173939

  However, in the water leakage detection sensor as described above, since it is necessary to supply power to each of the plurality of conductors constituting the water leakage detection sensor, the power supply must be connected to the water leakage detection sensor. Therefore, there is a problem that the wiring for connecting the water leakage detection sensor and the power source interferes with other work at the time of building construction or other members in the building. Further, depending on the position of the joint portion of the pipe, there is a possibility that the water leakage detection sensor and the power source cannot be connected, and it is difficult to say that the pipe is attached to an arbitrary position of the pipe. Moreover, since the power supply connected to a conductor and the wiring for connecting them are needed, there exists a problem that cost will increase correspondingly.

  The present invention has been made in view of the problems of the conventional techniques as described above, and can be easily attached to an arbitrary position such as a pipe at a low cost, so that a leak of the pipe or the like can be prevented. It is an object to provide a moisture detection member and a water leakage detection method that can be detected.

In order to achieve the above object, the present invention provides:
A moisture detection member for detecting moisture,
A sheet-like base substrate;
An antenna portion made of a conductor provided on the base substrate;
An IC chip connected to the conductor and provided on the base substrate, and capable of reading information in a non-contact state via the conductor;
An adhesive is applied to the outer peripheral portion of one surface of the base substrate so that at least a part of the region facing the antenna portion is exposed.

Further, a moisture detection member for detecting moisture,
A sheet-like base substrate;
An antenna portion made of a conductor provided on the base substrate;
An IC chip connected to the conductor and provided on the base substrate, and capable of reading information in a non-contact state via the conductor;
An adhesive applied to one surface of the base substrate;
A water absorbing material attached to the base substrate so as to face at least a part of the antenna portion.

Further, a moisture detection member for detecting moisture,
A sheet-like base substrate having water absorption;
An antenna portion made of a conductor provided on the base substrate;
An IC chip connected to the conductor and provided on the base substrate, and capable of reading information in a non-contact state via the conductor;
And an adhesive applied to one surface of the base substrate.

  In the antenna unit, at least a part of the conductor is exposed.

Further, a water leakage detection method for detecting water leakage of the object using an RFID attached to the object and an information reading device that reads information from the RFID,
Measuring a first distance at which information can be read from the RFID in a state where moisture is attached to the RFID attached to the object;
After a predetermined time has elapsed, a second distance at which information can be read from the RFID is measured,
When the second distance is equal to or less than the first distance, it is determined that water leakage has occurred.

  In the present invention configured as described above, when an information reading device capable of reading information is brought close to an IC chip while being attached to a pipe or the like, an antenna is generated by radio waves generated by the information reading device. The part resonates and a current is generated in the antenna part, whereby information written in the IC chip is read out. Here, the distance at which information can be read from the IC chip varies depending on the shape of the antenna portion and the dielectric constant and magnetic permeability of the base substrate and the piping to be attached. In other words, when moisture adheres to the area facing the antenna portion, the dielectric constant and permeability around the antenna portion change, or radio waves are absorbed by the moisture, and the distance that information can be read from the IC chip changes. Will do. Therefore, the shape of the antenna part can be obtained based on the dielectric constant and permeability of the base substrate and the pipe to be attached when the moisture detecting member is attached to the pipe or the like so that the maximum readable distance can be obtained. If designed, if water leaks in the piping, etc., and moisture adheres to the area facing the antenna, the information can be read from the IC chip and the information can be read from the IC chip. By changing the distance, it is possible to detect water leakage from the attached pipe or the like.

  As described above, in the present invention, the pressure-sensitive adhesive is applied to the outer peripheral portion of one surface of the base substrate so that at least a part of the region facing the antenna portion is exposed. If water leaks in the pipe while attached to the pipe, etc., the water due to the water leak accumulates in the area facing the antenna part, thereby reducing the cost and any position of the pipe, etc. It can be easily installed and can detect even a small amount of water leakage such as piping.

  In addition, in the case where a water absorbing material is attached so as to face at least a part of the antenna part, the water generated by the water leakage can be collected in the area facing the antenna part, thereby detecting even a small amount of water leakage. It can be made easier.

  In addition, in the case where the base substrate has water absorption, the moisture generated by water leakage can be collected in the moisture detection member, thereby making it easy to detect even a small amount of water leakage.

  In addition, in the case where at least a part of the conductor constituting the antenna unit is exposed, the moisture generated by the water leakage directly adheres to the antenna unit, which may or may not occur. The distance from which the information can be read from the IC chip is greatly different from the case where it is not, and water leakage can be easily detected.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a view showing a first embodiment of a moisture detection member of the present invention, where (a) is a view seen from the surface, and (b) is a cross-sectional view taken along line AA ′ shown in (a). It is.

  In the present embodiment, as shown in FIG. 1, an antenna section 20 composed of two strip-shaped conductors 21a and 21b formed with a gap is formed on a sheet-like base substrate 30 made of resin, paper, or the like. The IC chip 10 is mounted so that information can be read out in a non-contact state in the 2.45 GHz frequency band so that the two conductors 21a and 21b are connected to the mutually opposing regions. ing. Further, an adhesive 40 is applied to the outer peripheral portion of the surface of the base substrate 30 on which the antenna unit 20 is formed so as to surround the antenna unit 20 and the IC chip 10. Thereby, the antenna unit 20 and the IC chip 10 are exposed without the adhesive 40 being applied.

  In the moisture detection member 1 configured as described above, when close to an information reading device (not shown) provided outside, the antenna unit 20 resonates due to radio waves generated by the information reading device, and the antenna unit. A current is generated at 20, whereby information written in the IC chip 10 is read out. Here, the distance at which information can be read from the IC chip 10 varies depending on the shape of the antenna unit 10 and the dielectric constant and permeability of the object to which the base substrate 30 and the moisture detection member 1 are attached. Therefore, the length of the two conductors 21a and 21b constituting the antenna unit 20 is based on the base substrate 30 and the dielectric constant and magnetic permeability of the object to which the moisture detection member 1 is attached. When the member 1 is attached to an object, the distance from which information can be read from the IC chip 10 is designed to be maximized.

  Below, the utilization method of the member 1 for moisture detection comprised as mentioned above is demonstrated.

  FIGS. 2A and 2B are diagrams for explaining an example of a method of using the moisture detection member 1 shown in FIG. 1, wherein FIG. 2A is a schematic overall view, and FIG. 2B is a detail of part A shown in FIG. FIG.

  As shown in FIG. 2, the moisture detection member 1 as shown in FIG. 1 can be used, for example, for water leakage detection of a pipe in which pipe portions 2 a to 2 c are joined by joints 3 a and 3 b. In that case, as shown to Fig.2 (a), the water | moisture content which has the structure shown in FIG. 1 so that joining part 4a-4d may be straddled on joining part 4a-4d of pipe part 2a-2c and joint 3a, 3b. The detection members 1a to 1d are pasted with the adhesive 40, respectively. At this time, moisture due to water leakage generated on the upper surface or side surface of the piping travels around the piping to the lower surface of the piping, and moisture due to water leakage generated on the lower surface of the piping falls down from the piping as it is. Therefore, the moisture detection members 1a to 1d are affixed to the lower surfaces of the joint portions 4a to 4d between the pipe portions 2a to 2c and the joints 3a and 3b. The lengths of the two conductors 21a and 21b constituting the antenna unit 20 of the moisture detection members 1a to 1d are the dielectric constant and permeability of the base substrate 30 and the pipe to which the moisture detection member 1 is attached. Based on the above, when the moisture detection members 1a to 1d are affixed to the pipe, the distance from which information can be read from the IC chip 10 is designed to be maximized.

  FIG. 3 is a view for explaining a water leakage detection method when the moisture detection member 1 shown in FIG. 1 is attached to a pipe as shown in FIG. In this embodiment, it is assumed that water leakage does not occur in the joint portion 4b between the pipe portion 3a and the joint 2b, and water leakage occurs in the joint portion 4c between the pipe portion 3b and the joint 2b.

  When the moisture detection member 1 shown in FIG. 1 is used for leak detection of a pipe in which the pipe portions 2a to 2c are joined by joints 3a and 3b, the moisture detection members 1a to 1d having the configuration shown in FIG. Is attached to the pipe as shown in FIG. Then, the information reading device 5 capable of reading information in a non-contact state with respect to the IC chip 10 of the moisture detection members 1a to 1d is connected to the joint portions 4a to 4d of the pipe portions 2a to 2c and the joints 3a and 3b. On the other hand, it is arranged via a predetermined interval L from the side where the moisture detection members 1a to 1d are affixed, and it is confirmed whether information can be read from the IC chip 10 of the moisture detection members 1a to 1d in that state. To do. Here, the distance L between the joint portions 4a to 4d of the pipe and the information reading device 5 needs to be within a distance that enables reading of information in the IC chip 10, but the maximum information of the information from the IC chip 10 is not necessary. It is preferable that the distance is close to the readable distance.

  In this embodiment, water leakage does not occur at the joint portion 4b between the pipe portion 3a and the joint 2b. For this reason, the information readable distance from the IC chip 10 of the moisture detecting member 1b affixed to the joint portion 4b is the maximum distance at which information can be read from the IC chip 10, and therefore the information reading device 5 Is arranged at a predetermined interval L with respect to the joint portion 4b, information is read from the IC chip 10 by the information reading device 5. Thereby, it is confirmed that water leakage does not occur in the joint portion 4b between the pipe portion 3a and the joint 2b.

  Further, water leakage occurs at the joint portion 4c between the pipe portion 3b and the joint 2b. And in this junction part 4c, the exposed conductors 21a and 21b become the junction part 4c side, and the member 1c for moisture detection is affixed. Therefore, moisture 6 due to water leakage adheres to the conductors 21a and 21b constituting the antenna unit 20 at the joint portion 4c. As a result, the dielectric constant and permeability around the antenna unit 20 change, or radio waves are absorbed by moisture, and the information readable distance from the IC chip 10 changes. Here, as described above, the lengths of the two conductors 21a and 21b constituting the antenna unit 20 of the moisture detection members 1a to 1d are the base substrate 30 and the pipe to which the moisture detection member 1 is attached. Based on the dielectric constant and the magnetic permeability, when the moisture detection members 1a to 1d are affixed to the pipe, the distance from which information can be read from the IC chip 10 is designed to be maximized. When the moisture 6 adheres to the conductors 21a and 21b constituting the antenna unit 20 and the dielectric constant and permeability around the antenna unit 20 change, or when radio waves from the information reading device 5 are absorbed by the moisture 6, Even if the information reading device 5 is arranged at a predetermined distance L with respect to the joint portion 4 c, information is not read from the IC chip 10 by the information reading device 5. Thereby, it is confirmed that water leakage has occurred in the joint portion 4c between the pipe portion 3b and the joint 2b. At this time, in the moisture detection members 1a to 1c, since the adhesive 40 is applied so that the antenna portion 20 is exposed at the outer peripheral portion of the base substrate 30, the moisture 6 due to water leakage is absorbed by the antenna portion 20. It accumulates in the area provided, so that even a small amount of water leakage can be detected.

  Note that the readable distance from the IC chip 10 varies depending on the amount of moisture adhering to the region facing the antenna unit 20. For example, in the case of a member designed to respond to radio waves of 2.45 GHz, moisture adheres to a part of the antenna unit 20 as well as moisture adheres to the entire area facing the antenna unit 20. Even in such a case, the readable distance is 1/10 or less. Therefore, also in this embodiment, the adhesive 40 is not applied to the region facing the antenna unit 20, but is applied to the outer peripheral portion of the base substrate 30.

  In this way, in the present embodiment, the moisture detection members 1a to 1d configured to change the communicable distance when moisture adheres are pasted on the pipe, and the moisture detection members 1a to 1d are attached. It is possible to detect water leakage in the pipe depending on whether or not the information can be read out. Therefore, as described above, the pipe formed by joining the pipe portions 2a to 2c and the joints 3a and 3b is not exposed, but the cover is removed even when the pipe is covered with a cover or the like, for example. It is possible to detect water leakage in the piping without any trouble.

  The IC chip 10 constituting the moisture detection members 1a to 1d is written with information for identifying the pipes to which the moisture detection members 1a to 1d are attached, or the moisture detection members 1a to 1d are inserted. Even if a plurality of pipes are closely arranged, if identifiable information is written and the pipes to which the moisture detection members 1a to 1d are attached are managed. It is possible to recognize in which piping water leakage has occurred.

  Further, in this embodiment, the IC chip 10 constituting the moisture detection members 1a to 1d is configured to be able to read information in a non-contact state, and the leakage of piping is detected by reading information from the IC chip 10. As an example, the IC chip 10 is configured to be capable of reading and writing information in a non-contact state, and in addition to the above-described processing, the inspection was performed when water leakage was inspected. It is also conceivable to write the date and time, the trader name, etc. into the IC chip 10. For example, it is conceivable that the inspection for water leakage as described above is performed by injecting a large amount of water into a pipe at the time of construction of a condominium or the like. It is possible.

(Second Embodiment)
FIGS. 4A and 4B are diagrams showing a second embodiment of the moisture detection member of the present invention, where FIG. 4A is a view seen from the surface, and FIG. 4B is a cross-sectional view taken along line AA ′ shown in FIG. It is.

  In this embodiment, as shown in FIG. 4, an antenna unit 120 composed of two strip-shaped conductors 121 a and 121 b formed with a gap is formed on a sheet-like base substrate 130 made of resin, paper, or the like. The IC chip 110 is mounted so that information can be read out in a non-contact state in the frequency band of 2.45 GHz so that the two conductors 121a and 121b are connected to each other. ing. Further, on the surface of the base substrate 130 on which the antenna portion 120 is formed, a water absorbing material 150 made of a highly water-absorbing resin or the like is attached to a part of the antenna portion 120, and the antenna portion 120 and the IC chip 110. The adhesive 140 is applied so as to surround the. Thereby, the antenna unit 120 and the IC chip 110 are exposed without the adhesive 140 being applied, and a part of the antenna unit 120 faces the water absorbing material 150. In addition, as the water absorbing material 150, it is possible to provide a sheet having high water absorption or to apply a resin having high water absorption, and as the water absorbing resin, for example, a water-soluble resin is partially crosslinked. Various water-insoluble ones can be used as long as they have a water absorption rate several times or more than their own weight.

  In the moisture detecting member 101 configured as described above, when it is brought close to an information reading device (not shown) provided outside, the antenna unit 120 resonates due to the radio wave generated by the information reading device, and the antenna unit. A current is generated in 120, whereby information written in the IC chip 110 is read out. Here, the distance at which information can be read from the IC chip 110 depends on the shape of the antenna unit 110, and the dielectric constant and permeability of the object to which the base substrate 130, the water absorbing material 150, and the moisture detection member 101 are attached. Change. Therefore, the lengths of the two conductors 121a and 121b constituting the antenna unit 120 are based on the dielectric constant and magnetic permeability of the base substrate 130, the water absorbing material 150, and the object to which the moisture detection member 101 is attached. In addition, when the moisture detection member 101 is attached to an object, the distance from which information can be read from the IC chip 110 is designed to be maximized.

  The moisture detection member 101 described above may be used by being affixed to a pipe with an adhesive 140 in the same manner as described in the first embodiment, but the water absorbing material 150 is affixed to the antenna unit 120. Therefore, the moisture generated by the water leakage can be collected in the antenna unit 120, thereby making it easy to detect even a small amount of water leakage. In addition, about the area | region where the water absorbing material 150 is affixed, it is preferable to set it as an area | region facing the antenna part 120. FIG.

  In the two embodiments described above, the adhesive 40, the antenna parts 20, 120 and the IC chips 10, 10 are surrounded on the surface of the base substrate 30, 130 where the antenna parts 20, 120 are formed. 140 is applied so that the antenna parts 20 and 120 and the IC chips 10 and 110 are exposed without the adhesives 40 and 140 being applied, but at least a part of the antenna parts 20 and 120 is exposed. The adhesives 40 and 140 should just be apply | coated. In that case, it is preferable to make it the area | region which opposes the antenna parts 20 and 120 about the area | region exposed without the adhesives 40 and 140 being applied in the antenna parts 20 and 120.

(Third embodiment)
5A and 5B are views showing a third embodiment of the moisture detection member of the present invention, where FIG. 5A is a view seen from the surface, and FIG. 5B is a cross-sectional view taken along line AA ′ shown in FIG. (C) is the figure seen from the back surface.

  In this embodiment, as shown in FIG. 5, an antenna composed of two strip-shaped conductors 221a and 221b formed on one surface of a sheet-like base substrate 230 made of resin, paper or the like with a gap between each other. A portion 220 is formed, and an IC chip 210 capable of reading information in a non-contact state in a frequency band of 2.45 GHz is mounted so as to be connected to regions of the two conductors 221a and 221b facing each other. Has been configured. Further, the antenna unit 220 is formed, and the adhesive 240 is applied to the entire surface on which the IC chip 210 is mounted. The surface opposite to the surface is opposed to the antenna unit 220 through the base substrate 230. A water-absorbing material 250 made of a highly water-absorbing resin or the like is affixed to a part of the area to be used.

  In the moisture detecting member 201 configured as described above, when close to an information reading device (not shown) provided outside, the antenna unit 220 resonates due to the radio wave generated by the information reading device, and the antenna unit. A current is generated in 220, whereby information written in the IC chip 210 is read out. Here, the distance at which information can be read from the IC chip 210 includes the shape of the antenna unit 210 and the dielectric constant of the object to which the base substrate 230, the adhesive 240, the water absorbing material 250, and the moisture detection member 201 are attached. Varies with permeability. For this reason, the lengths of the two conductors 221a and 221b constituting the antenna unit 220 are the base substrate 230, the adhesive 240 and the water absorbing material 250, and the dielectric constant and permeability of the object to which the moisture detecting member 201 is attached. Based on the magnetic susceptibility, the distance from which information can be read from the IC chip 210 is designed to be maximized when the moisture detection member 201 is attached to an object.

  It is conceivable that the moisture detection member 201 described above is used by being affixed to a pipe with an adhesive 240 in the same manner as described in the first embodiment. In that case, the water generated by the water leakage is absorbed by the water absorbing material 250, but the water absorbing material 250 is attached to a part of the region facing the antenna unit 220 via the base substrate 230. When a water leak occurs at, the dielectric constant and the magnetic permeability around the antenna unit 220 can be greatly changed, and thus even a small amount of water leak can be easily detected. In addition, about the area | region where the water absorbing material 250 is affixed, it is preferable to set it as an area | region which opposes the antenna part 220. FIG.

(Fourth embodiment)
6A and 6B are views showing a fourth embodiment of the moisture detection member of the present invention, where FIG. 6A is a view seen from the surface, and FIG. 6B is a cross-sectional view taken along line AA ′ shown in FIG. (C) is the figure seen from the back surface.

  In the present embodiment, as shown in FIG. 6, an antenna composed of two strip-shaped conductors 321 a and 321 b formed on one surface of a sheet-like base substrate 330 made of resin, paper, or the like so as to have a gap therebetween. An IC chip 310 capable of reading out information in a non-contact state in the 2.45 GHz frequency band is mounted so that the portion 320 is formed and connected to the mutually opposing regions of the two conductors 321a and 321b. Has been configured. Further, on the surface where the antenna part 320 is formed, a water absorbing material 350 made of a highly water-absorbing resin or the like is attached to a part of the antenna part 320, and an adhesive is applied to the entire surface opposite to the surface. 340 is applied. Thereby, a part of the antenna unit 320 faces the water absorbing material 350.

  In the moisture detection member 301 configured as described above, when close to an information reading device (not shown) provided outside, the antenna unit 320 resonates due to radio waves generated by the information reading device, and the antenna unit. A current is generated in 320, whereby information written in the IC chip 310 is read out. Here, the distance at which information can be read from the IC chip 310 is the dielectric constant of the shape of the antenna unit 310 and the object to which the base substrate 330, the adhesive 340, the water absorbing material 350 and the moisture detection member 301 are attached. Varies with permeability. For this reason, the lengths of the two conductors 321a and 321b constituting the antenna unit 320 are the base material 330, the adhesive 340, the water absorbing material 350, and the dielectric constant and permeability of the object to which the moisture detection member 301 is attached. Based on the magnetic susceptibility, when the moisture detection member 301 is attached to an object, the distance from which information can be read from the IC chip 310 is designed to be maximized.

  It is conceivable that the moisture detection member 301 described above is used by being affixed to a pipe with an adhesive 340 in the same manner as described in the first embodiment. In that case, the water generated by the water leakage is absorbed by the water absorbing material 350. However, since the water absorbing material 350 is affixed to a part of the antenna portion 320, when water leakage occurs in the pipe, The generated moisture can be collected in the antenna unit 320, and thereby, even a small amount of water leakage can be easily detected. In addition, about the area | region where the water absorbing material 350 is affixed, it is preferable to set it as an area | region which opposes the antenna part 320. FIG.

(Fifth embodiment)
FIG. 7 is a view showing a fifth embodiment of the moisture detection member of the present invention.

  In the present embodiment, as shown in FIG. 7, an antenna section 420 composed of two strip-shaped conductors 421a and 421b formed with a gap is formed on a sheet-like base substrate 430 made of resin, paper, or the like. An IC chip 410 that can read information in a non-contact state in a frequency band of 2.45 GHz is mounted so that the two conductors 421a and 421b are connected to each other. ing. Furthermore, a hanging string 460 serving as a hanging portion is connected to the base substrate 430 so as to be connected to the conductors 421a and 421b. The hanging string 460 is connected to the base substrate 430 by a known method of passing through a hole (not shown) formed in the base substrate 430.

  In the moisture detection member 401 configured as described above, when it is brought close to an information reading device (not shown) provided outside, the antenna unit 420 resonates due to the radio wave generated by the information reading device. A current is generated in 420, whereby information written in the IC chip 410 is read out. Here, the distance at which information can be read from the IC chip 410 varies depending on the shape of the antenna portion 410 and the dielectric constant and permeability of the base substrate 430. Therefore, the lengths of the two conductors 421a and 421b constituting the antenna unit 420 are based on the dielectric constant and magnetic permeability of the base substrate 430 when the moisture detection member 401 is attached to the object. It is designed to maximize the distance from which information can be read.

  Hereinafter, a method of using the moisture detection member 401 configured as described above will be described.

  FIG. 8 is a diagram for explaining an example of a method of using the moisture detection member 401 shown in FIG.

  As shown in FIG. 8, the moisture detection member 401 as shown in FIG. 7 can be used, for example, for water leak detection of a pipe formed by joining the pipe portion 2 and the joint 3. In that case, as shown in FIG. 8, the suspension string 460 is suspended from the joint portion 4 between the pipe portion 2 and the joint 3.

  Then, when water leaks at the joint portion 4 between the pipe portion 2 and the joint 3, the water 6 due to the water leaks down the conductors 421 a and 421 b on the base substrate 430 through the hanging string 460. As a result, the readable distance of the IC chip 410 changes as in the above-described embodiment, and it is detected whether or not water leakage has occurred in the piping depending on whether or not information can be read from the IC chip 410 by the information reading device. can do.

  In the present embodiment as well, as in the second and fourth embodiments, a water absorbing material is pasted so as to face a part of the antenna section 420, and the moisture transmitted through the hanging string 460 is removed. It is possible to stay on top.

  Further, in the above-described embodiment, if the base substrate 30, 130, 230, 330, 430 is made of a material having a water absorption property, moisture generated by water leakage is detected as the moisture detection members 1, 101, 201. , 301, 401 so that even a small amount of water leakage can be easily detected.

  In the above-described embodiment, the two conductors 21a, 21b, 121a, 121b, 221a, 221b, 321a, 321b, 421a, and 421b constituting the antenna units 20, 120, 220, 230, 330, and 430 are strip-shaped. However, the shape of the conductors 21a, 21b, 121a, 121b, 221a, 221b, 321a, 321b, 421a, 421b is not limited to a band shape, and an arbitrary one such as an isosceles triangle is applied. be able to. In addition, the antenna portions 20, 120, 220, 230, 330, and 430 are formed with two conductors 21a, 21b, 121a, 121b, 221a, 221b, 321a, 321b, 421a, and 421b having a gap therebetween. However, it is also conceivable to form the antenna portion from one conductor and connect an IC chip to the end of the conductor.

  In the above-described embodiment, the IC chips 10, 110, 210, 310, 410 and the antenna units 20, 120, 220, 320, 420 provided on the base substrates 30, 130, 230, 330, 430 are also provided. Although the IC chip and the antenna portion are sandwiched between two base base materials or those embedded in the base base material, the above-described embodiment is used. As shown, by applying an adhesive so that at least a part of the area facing the antenna part is exposed, or by sticking a water absorbing material to at least a part of the area facing the antenna part, Similar effects can be obtained.

  In addition, the IC chips 10, 110, 210, 310, and 410 have been described with reference to an example in which information can be read out in the 2.45 GHz frequency band. Needless to say, a device that can write or read information can be applied. However, it is preferable that information can be read in a high-frequency band because a communicable distance greatly varies when moisture adheres. For example, even when an antenna and an IC chip that respond to a frequency of 13.56 MHz are used, the communication distance is reduced due to the influence of moisture, but it can be used, but is preferably strongly influenced by moisture. It is preferable to use one that responds to a frequency in the UHF band such as .45 GHz.

  Moreover, even if it is other than the moisture detection member described in the above-described embodiment, it is possible to detect water leakage as long as the RFID can read information without contact. In this case, the change in the distance at which information can be read from the RFID before and after moisture adheres to the RFID differs depending on conditions such as the antenna, IC chip, substrate, frequency used for readout, and the like.

  Therefore, as a method for detecting water leakage, first, in a state where moisture is not attached to the RFID attached to the object, the distance L0 at which information can be read from the RFID is measured, and then the predetermined moisture is applied to the RFID. In this state, the distance L1 at which information can be read from the RFID is measured as the first distance. Here, the predetermined moisture is moisture that is equal to or more than an amount that should be a criterion for determining that water leakage has occurred. In addition, even if RFIDs are manufactured under the same conditions, there are some individual differences, and the distance at which information can be read varies slightly depending on the state of moisture adhesion, so the difference between the distance L0 and the distance L1 is 10 cm or less. In this case, detection becomes difficult. In other words, it is necessary to select an RFID such that the difference between the distance L0 and the distance L1 is at least 10 cm or set the amount of moisture attached to the RFID.

  After a predetermined time has passed since such preparation, the distance L2 at which information can be read from the RFID attached to the object is measured as the second distance. When the measured distance L2 is equal to or less than the distance L1, it is determined that water leakage has occurred. Note that when a large amount of moisture adheres to the RFID, there is a case where information cannot be read from the RFID. In this case, the distance L2 is set to zero.

  By such a method, water leakage can be detected easily and inexpensively.

It is a figure which shows 1st Embodiment of the member for a moisture detection of this invention, (a) is the figure seen from the surface, (b) is A-A 'sectional drawing shown to (a). It is a figure for demonstrating an example of the utilization method of the member for a moisture detection shown in FIG. 1, (a) is a schematic whole figure, (b) is a figure which shows the detail of the A section shown to (a). . It is a figure for demonstrating the water leak detection method at the time of sticking the moisture detection member shown in FIG. 1 to piping as shown in FIG. It is a figure which shows 2nd Embodiment of the member for a moisture detection of this invention, (a) is the figure seen from the surface, (b) is A-A 'sectional drawing shown to (a). It is a figure which shows 3rd Embodiment of the member for a moisture detection of this invention, (a) is the figure seen from the surface, (b) is AA 'sectional drawing shown to (a), (c). Is a view from the back side. It is a figure which shows 4th Embodiment of the member for a moisture detection of this invention, (a) is the figure seen from the surface, (b) is AA 'sectional drawing shown to (a), (c). Is a view from the back side. It is a figure which shows 5th Embodiment of the member for a moisture detection of this invention. It is a figure for demonstrating an example of the utilization method of the member for a moisture detection shown in FIG.

Explanation of symbols

1, 1a to 1d, 101, 201, 301, 401 Moisture detection member 2, 2a to 2c Pipe portion 3, 3a, 3b Joint 4, 4a to 4d Joint portion 5 Information reading device 6 Moisture 10, 110, 210, 310 , 410 IC chip 20, 120, 220, 320, 420 Antenna portion 21a, 21b, 121a, 121b, 221a, 221b, 321a, 321b, 421a, 421b Conductor 30, 130, 230, 330, 430 Base substrate 40, 140 , 240, 340, 440 Adhesive 150, 250, 350 Water absorbing material 460 Hanging string

Claims (5)

A moisture detection member for detecting moisture,
A sheet-like base substrate;
An antenna portion made of a conductor provided on the base substrate;
An IC chip connected to the conductor and provided on the base substrate, and capable of reading information in a non-contact state via the conductor;
A moisture detection member having an adhesive applied to an outer peripheral portion of one surface of the base substrate so that at least a part of a region facing the antenna portion is exposed. A moisture detection member for detecting moisture,
A sheet-like base substrate;
An antenna portion made of a conductor provided on the base substrate;
An IC chip connected to the conductor and provided on the base substrate, and capable of reading information in a non-contact state via the conductor;
An adhesive applied to one surface of the base substrate;
A moisture detection member having a water absorbing material attached to the base substrate so as to face at least a part of the antenna unit. A moisture detection member for detecting moisture,
A sheet-like base substrate having water absorption;
An antenna portion made of a conductor provided on the base substrate;
An IC chip connected to the conductor and provided on the base substrate, and capable of reading information in a non-contact state via the conductor;
A moisture detecting member having an adhesive applied to one surface of the base substrate. In the moisture detection member according to any one of claims 1 to 3,
The moisture detecting member, wherein at least a part of the conductor is exposed in the antenna portion. A water leakage detection method for detecting water leakage of the object using an RFID attached to the object and an information reading device that reads information from the RFID,
Measuring a first distance at which information can be read from the RFID in a state where moisture is attached to the RFID attached to the object;
After a predetermined time has elapsed, a second distance at which information can be read from the RFID is measured,
A water leakage detection method for determining that water leakage has occurred when the second distance is equal to or less than the first distance.

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