Sensors and Sensing Devices

Abstract

This thread-shape sensor (100) is provided with non-conductive linear bodies (21), and two or more wires (11, 12) that contain a conductive linear body, wherein the wires (11, 12) are provided in a manner not contacting one another.

Description

[Technical Field]

[0001] The present invention relates to sensors and sensing devices. [Background technology]

[0002] One proposed moisture sensor for detecting moisture utilizes an electromotive force generated when moisture comes into contact with a pair of electrodes. For example, Patent Document 1 describes an electromotive module provided in a worn article having an absorbent body that receives excrement. The electromotive module has a pair of electrodes made of materials with different ionization tendencies, and at least one of the pair of electrodes has a skeleton structure including a skeleton portion and a void portion provided between the skeleton portions. An electromotive force is generated when the pair of electrodes come into contact with urine excreted in the absorbent body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-229003 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the electromotive module described in Patent Document 1 uses sheet materials such as carbon-printed sheets or aluminum sheets as electrodes. Therefore, when the sheet materials are thick, they lack flexibility, and when the sheet materials are thin, they lack durability. Therefore, a sensor with excellent flexibility and durability is needed. Furthermore, if this sensor could be woven into a textile or the like as a thread, it could be easily attached to a worn article or the like in a space-saving manner.

[0005] It is an object of the present invention to provide a thread-like sensor and sensing device. [Means for solving the problem]

[0006] According to one aspect of the present invention, there is provided a thread-shaped sensor comprising two or more wires, including a conductive linear body, and a non-conductive linear body, wherein the wires are arranged so as not to touch each other.

[0007] In the sensor according to the aspect of the present invention, it is preferable that the conductive linear body has a diameter of 2 μm or more and 1000 μm or less.

[0008] In the sensor according to one aspect of the present invention, the wire resistance of the conductive linear body is 5.0×10 -3 Ω / cm or more 1.0×10 3 It is preferably Ω / cm or less.

[0009] In the sensor according to one aspect of the present invention, it is preferable that the conductive linear member is at least one selected from the group consisting of a linear member including a metal wire and a linear member including a conductive thread.

[0010] In the sensor according to one aspect of the present invention, it is preferable that one of the wires is made of a material different from the other, and that the ionization tendency of the material is different.

[0011] According to one aspect of the present invention, there is provided a sensing device comprising a sensor according to the aspect of the present invention, a sensing module that senses the potential difference between the wirings, and a wireless transmitting module that transmits a wireless signal.

[0012] According to the present invention, a thread-like sensor and sensing device can be provided. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a schematic diagram showing a sensor according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view showing the II-II cross section of FIG. [Figure 3]1 is a schematic diagram showing a state in which a sensor according to a first embodiment of the present invention is attached to an adherend. [Figure 4] 1 is a schematic diagram illustrating a sensing device according to a first embodiment of the present invention; [Figure 5] FIG. 4 is a schematic diagram showing a sensor according to a second embodiment of the present invention. [Figure 6] FIG. 10 is a schematic diagram showing a sensor according to a third embodiment of the present invention. [Figure 7] FIG. 10 is a schematic diagram showing a sensor according to a fourth embodiment of the present invention. [Figure 8] FIG. 10 is a schematic diagram showing a sensor according to a fifth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0014] [First embodiment] The present invention will be described below by taking an embodiment as an example and referring to the drawings. The present invention is not limited to the content of the embodiment. In the drawings, some parts are illustrated enlarged or reduced in size for ease of explanation.

[0015] (sensor) As shown in FIGS. 1 and 2 , the sensor 100 according to this embodiment includes a first wiring 11, a second wiring 12, and a non-conductive linear body 21. The first wiring 11 and the second wiring 12 each include a conductive linear body. There are six non-conductive linear bodies 21. The six non-conductive linear bodies 21, the first wiring 11, and the second wiring 12 are twisted together to form a twisted yarn. The first wiring 11 and the second wiring 12 are configured not to touch each other. When a substance comes into contact between the first wiring 11 and the second wiring 12, the sensor 100 can sense the substance. The substance that can be sensed is not particularly limited as long as it is a fluid that can conduct electricity. Specific examples include liquids and gel-like fluids. More specific examples include water, urine, and blood. Particularly preferred substances include substances that contain moisture. Preferably, sensor 100 is a moisture sensor.

[0016] (wiring) The sensor 100 according to this embodiment may include two or more wirings, and may include at least the first wiring 11 and the second wiring 12. For example, in addition to the first wiring 11 and the second wiring 12, another wiring (not shown) may be included. The first wiring 11 and the second wiring 12 each include a conductive linear body. The first wiring 11 and the second wiring 12 may each include a plurality of conductive linear bodies. Furthermore, the first wiring 11 and the second wiring 12 may each include a connecting material (solder, conductive paste, etc.) or a connecting member (connector, etc.) other than the conductive linear bodies.

[0017] (Conductive linear body) The conductive linear bodies used for the first wiring 11 and the second wiring 12 are not particularly limited as long as they are conductive, and examples thereof include linear bodies containing metal wires and linear bodies containing conductive threads. The conductive linear bodies may be linear bodies containing metal wires and conductive threads (such as linear bodies in which metal wires and conductive threads are twisted together). In this specification, a linear body refers to a linear member. The length of the linear body is, for example, 1 cm or more. The shape of the linear body is not particularly limited, and it may be a single linear member or an assembly of multiple linear members. The cross-sectional shape of the linear body may be various shapes depending on the shape of the linear body.

[0018] Both the linear body including a metal wire and the linear body including a conductive thread have high electrical conductivity, and therefore, when used as a conductive linear body, it becomes easy to reduce the resistance of the first wiring 11 and the second wiring 12.

[0019] Examples of metal wires include wires containing metals such as copper, aluminum, tungsten, iron, molybdenum, nickel, titanium, silver, and gold, or alloys containing two or more metals (steels such as stainless steel and carbon steel, brass, phosphor bronze, zirconium-copper alloys, beryllium copper, iron-nickel, nichrome, nickel-titanium, Kanthal, Hastelloy, and rhenium-tungsten).The metal wires may be plated with tin, zinc, silver, nickel, chromium, nickel-chromium alloys, solder, or the like, or may be surface-coated with a carbon material or polymer, as described below.

[0020] The metal wire may be coated with a carbon material, which inhibits metal corrosion.

[0021] Examples of carbon materials that can be used to coat the metal wire include amorphous carbon (carbon black, activated carbon, hard carbon, soft carbon, mesoporous carbon, carbon fiber, etc.), graphite, fullerene, graphene, and carbon nanotubes.

[0022] The linear body containing the conductive thread may be a linear body made of a single conductive thread, or may be a linear body made of twisted conductive threads. It may also be a linear body made of twisted conductive threads and insulating threads. The linear body containing the conductive thread has the advantage of being more flexible and less prone to breakage than a linear body containing a metal wire. Examples of conductive yarns include yarns containing conductive fibers (such as metal fibers, carbon fibers, and ion-conductive polymer fibers), yarns containing conductive microparticles (such as carbon nanoparticles), yarns whose surfaces are plated or vapor-deposited with metals (such as copper, silver, and nickel), and yarns impregnated with metal oxides.

[0023] As a linear body containing a conductive thread, a linear body containing a thread (carbon nanotube thread) containing carbon nanotubes as carbon nanoparticles (hereinafter also referred to as a "carbon nanotube linear body") is particularly suitable.

[0024] Carbon nanotube linear bodies can be obtained, for example, by drawing carbon nanotubes into a sheet from the end of a carbon nanotube forest (a growth in which multiple carbon nanotubes are grown on a substrate so as to be aligned perpendicular to the substrate; sometimes referred to as an "array"), bundling the drawn carbon nanotube sheets, and then twisting the bundles of carbon nanotubes. In this production method, if no twist is applied during twisting, ribbon-shaped carbon nanotube linear bodies are obtained, whereas if twist is applied, thread-shaped carbon nanotube linear bodies are obtained. Ribbon-shaped carbon nanotube linear bodies are linear bodies that do not have a structure in which a collection of multiple carbon nanotubes is twisted. Alternatively, carbon nanotube linear bodies can be obtained by spinning a carbon nanotube dispersion. Carbon nanotube linear bodies can be produced by spinning, for example, by the method disclosed in U.S. Patent Publication US 2013 / 0251619 (Japanese Patent Application Laid-Open No. 2011-253140). From the viewpoint of obtaining uniformity in the diameter of the linear carbon nanotubes, it is desirable to use linear carbon nanotubes in a thread form, and from the viewpoint of obtaining linear carbon nanotubes with high purity, it is preferable to obtain linear carbon nanotubes in a thread form by twisting a carbon nanotube sheet. The linear carbon nanotubes may be a linear body formed by twisting two or more linear carbon nanotubes together.

[0025] The carbon nanotube linear body may be a linear body including a carbon nanotube and a conductive material other than the carbon nanotube, such as a metal, a conductive polymer, or graphene (hereinafter also referred to as a "composite linear body"). The composite linear body tends to improve the conductivity of the linear body while maintaining the above-described characteristics of the carbon nanotube linear body.

[0026] Examples of composite linear bodies include linear bodies containing carbon nanotubes and metals, such as: (1) a composite linear body in which a metal or a metal alloy is supported on the surface of a forest, sheet, or bundle of carbon nanotubes, or twisted linear body by vapor deposition, ion plating, sputtering, spray coating, wet plating, or the like, during the process of obtaining a carbon nanotube linear body by drawing carbon nanotubes from the end of a carbon nanotube forest into a sheet, bundling the drawn carbon nanotube sheet, and then twisting the carbon nanotube bundles; (2) a composite linear body in which bundles of carbon nanotubes are twisted together with linear bodies of a metal or a metal alloy, or a composite linear body; and (3) a composite linear body in which linear bodies of a metal or a metal alloy, or a composite linear body, are twisted together with carbon nanotube linear bodies or composite linear bodies. In the composite linear body of (2), a metal may be supported on the carbon nanotubes when twisting the bundles of carbon nanotubes, as in the composite linear body of (1). Furthermore, the composite linear body of (3) is a composite linear body in which two linear bodies are woven together, but it may also be a composite linear body in which three or more carbon nanotube linear bodies, or linear bodies of a single metal or a metal alloy, or composite linear bodies are woven together, as long as it contains at least one linear body of a single metal or a metal alloy, or composite linear body. Examples of metals for the composite linear body include simple metals (gold, silver, copper, iron, aluminum, nickel, chromium, tin, zinc, etc.) and alloys containing at least one of these simple metals (copper-nickel-phosphorus alloy, copper-iron-phosphorus-zinc alloy, etc.).

[0027] Among these conductive linear bodies, conductive linear bodies containing carbon nanotube yarns (particularly, conductive linear bodies containing only carbon nanotube yarns, or conductive linear bodies containing carbon nanotube yarns and non-metallic conductive materials) are preferred. For example, threads whose surfaces are plated or vapor-deposited with metals (copper, silver, nickel, etc.) or threads impregnated with metal oxides are prone to cracking in the metal or metal oxide when stretched repeatedly, resulting in low durability. In contrast, carbon nanotube linear bodies are highly resistant to bending, and their resistance value is less likely to change even after repeated stretching. Carbon nanotube linear bodies also have the advantage of being highly corrosion-resistant.

[0028] Here, the line resistance (specific resistance) of the conductive linear body is 5.0 × 10 -3 Ω / cm or more 1.0×10 3 It is preferable that the resistance is Ω / cm or less, and 1.0×10 -2 Ω / cm or more 5.0×10 2 It is more preferable that the linear resistance of the conductive linear body is Ω / cm or less. If the conductive linear body is made of a metal with high conductivity, the linear resistance of the conductive linear body can be set to the lower limit or more. On the other hand, if the linear resistance of the conductive linear body is the upper limit or less, the resistance can be kept low even if the wiring path is long, and the problem of the wiring itself acting as a resistor and imposing a load on the measuring instrument can be prevented.

[0029] The linear resistance of the conductive linear body is measured as follows. First, silver paste is applied to both ends of the conductive linear body, and the resistance between the silver pastes is measured to determine the resistance value (unit: Ω) of the conductive linear body. The obtained resistance value is then divided by the distance (cm) between the silver pastes to calculate the linear resistance of the conductive linear body.

[0030] The cross-sectional shape of the conductive linear body is not particularly limited and may be polygonal, flat, elliptical, circular, etc., but is preferably elliptical or circular from the viewpoint of ease of twisting with the non-conductive linear body 21, etc. When the cross section of the conductive linear body is circular, the diameter D (see FIG. 2) of the conductive linear body is preferably 2 μm to 1000 μm, more preferably 2 μm to 500 μm. From the viewpoints of flexibility and durability, the diameter D of the conductive linear body is more preferably 5 μm to 300 μm, and even more preferably 10 μm to 100 μm. When the cross section of the conductive linear body is elliptical, it is preferable that the major axis is in the same range as the above-mentioned diameter D. Furthermore, when the cross section of the conductive linear body is polygonal, it is preferable that the diameter of the circumferential circle of the polygon is in the same range as the above-mentioned diameter D.

[0031] The diameter D of the conductive linear body is determined by observing the cross section of the conductive linear body using a digital microscope, measuring the diameter of the conductive linear body, and averaging the measured values.

[0032] (Non-conductive linear body) The non-conductive linear body 21 is not particularly limited as long as it is a linear body that does not have electrical conductivity, and examples thereof include natural fibers, synthetic fibers, and semi-synthetic fibers. Natural fibers include cotton, linen, silk, wool, and cashmere. Synthetic fibers include polyester, nylon, and acrylic. Examples of semi-synthetic fibers include rayon, modal, Tencel, cupra, acetate, diacetate, and triacetate.

[0033] In the case where the number of wirings is two as in the present embodiment, if the number of non-conductive linear bodies 21 is six or more, the first wiring 11 and the second wiring 12 can be twisted together so as not to come into contact with each other. In the case where the number of wirings is two, the number of non-conductive linear bodies 21 is preferably six or more, more preferably ten or more, and particularly preferably fourteen or more. Furthermore, from the viewpoint of making the sensor 100 more dense, the number of non-conductive linear bodies 21 is preferably 30 or less. From the same viewpoint, the number of non-conductive linear bodies 21 is preferably at least three times the number of wires, more preferably at least five times the number of wires, and particularly preferably at least eight times the number of wires.

[0034] The cross-sectional shape of the non-conductive linear body 21 is not particularly limited and may be polygonal, flat, elliptical, circular, etc., but is preferably elliptical or circular from the viewpoint of ease of twisting with the conductive linear body, etc. When the cross section of the non-conductive linear body 21 is circular, the diameter of the non-conductive linear body 21 is preferably 2 μm to 1000 μm, more preferably 2 μm to 500 μm. From the viewpoint of ease of twisting with the conductive linear body, the diameter of the non-conductive linear body 21 is more preferably 5 μm to 300 μm, and even more preferably 10 μm to 100 μm. When the cross section of the non-conductive linear body 21 is elliptical, it is preferable that the major axis is in the same range as the diameter of a circular non-conductive linear body 21. Furthermore, when the cross section of the non-conductive linear body 21 is polygonal, it is preferable that the diameter of the outer circumferential circle of the polygon is in the same range as the diameter of a circular non-conductive linear body 21. Furthermore, from the viewpoint of ease of twisting with the conductive linear body or performance expression, the diameter ratio (non-conductive linear body / conductive linear body) of the non-conductive linear body 21 to the first wiring 11 and the second wiring 12 (conductive linear body) is preferably 1 / 5 or more and 5 or less, more preferably 1 / 3 or more and 3 or less, even more preferably 1 / 2 or more and 2 or less, and particularly preferably 1 or more and 3 / 2 or less.

[0035] The diameter of the non-conductive linear body 21 is determined by observing the cross section of the non-conductive linear body 21 using a digital microscope, measuring the diameter of the non-conductive linear body 21, and averaging the measured diameters.

[0036] (sensing device) Next, the sensing device according to this embodiment will be described. 3, the sensing device according to this embodiment includes a sensor 100, a sensing module 4 that senses the potential difference between wires, and a wireless transmitting module 5 that transmits a wireless signal. The sensor 100 is in contact with an adherend 3. The adherend 3 is an object to which the sensor 100 is attached, and is not particularly limited. The adherend 3 may be deformable, and may have recesses, protrusions, or curved surfaces. The sensor 100 according to this embodiment is thread-like and has excellent flexibility and durability, and therefore can be suitably used on such adherends 3. Furthermore, the adherend 3 may be a woven fabric, a knitted fabric, etc. Since the sensor 100 according to this embodiment is in the form of a thread, the sensor 100 can be woven or knitted into the adherend 3.

[0037] The sensing module 4 includes a first electrode 41 and a second electrode 42. The first electrode 41 is electrically connected to the first wiring 11, and the second electrode 42 is electrically connected to the second wiring 12. When a voltage is applied to the first electrode 41 and the second electrode 42 from a battery (not shown), if a substance comes into contact between the first wiring 11 and the second wiring 12 on the adherend 3, the voltage changes, and the substance can be sensed by the sensor 100.

[0038] When the sensing module 4 senses contact with a substance, the wireless transmitting module 5 transmits a wireless signal to the wireless relay station 6 shown in FIG. The wireless relay station 6 receives the wireless signal transmitted from the wireless transmitting module 5 and transmits a signal indicating that the wireless signal has been transmitted to the sensing server 7. Upon receiving the signal from the wireless relay station 6, the sensing server 7 senses that a substance is in contact with the sensor 100 based on the signal, and records this in an information processing terminal (not shown) as necessary.

[0039] In the sensing device according to this embodiment, it is preferable that one of the wires (first wire 11) and another of the wires (second wire 12) (hereinafter, these wires are also referred to as "adjacent wires") are made of different materials, and that these materials have different ionization tendencies. With this configuration, even without a battery, if a substance comes into contact between the first wire 11 and the second wire 12, an electromotive force is generated, and this substance can be sensed by the sensor 100.

[0040] The surface materials of the first wiring 11 and the second wiring 12 are, for example, aluminum (-1.676 V), titanium (-1.63 V), zinc (-0.7626 V), chromium (-0.74 V), iron (-0.44 V), nickel (-0.257 V), tin (-0.1375 V), copper (0.340 V), silver (0.7991 V), gold (1.52 V), and carbon. The values ​​in parentheses above are values ​​of ionization tendency. In this specification, carbon is treated as 0 V, which is the value of the ionization tendency of hydrogen.

[0041] From the viewpoint of electromotive force, the difference in ionization tendency between the materials of the surfaces of adjacent wirings is preferably 0.5 V or more, more preferably 0.8 V or more, and even more preferably 1.1 V or more. Preferred combinations of materials for the surfaces of adjacent wirings include a combination of aluminum and carbon, a combination of aluminum and copper, a combination of titanium and carbon, a combination of titanium and copper, a combination of zinc and carbon, a combination of zinc and copper, a combination of zinc and silver, and a combination of zinc and gold.

[0042] (Operation and effect of the first embodiment) According to this embodiment, the following effects can be achieved. (1) In this embodiment, the first wiring 11 and the second wiring 12 include conductive linear bodies, and therefore the sensor 100 is thread-shaped and has excellent flexibility and durability. (2) Because the first wiring 11 and the second wiring 12 are twisted into a thread-like shape, the distance between them is very narrow. Therefore, even a small amount of substance can be sensed, and the sensing performance is high. (3) The conductive linear body has a diameter D of 2 μm or more and 1000 μm or less, and therefore has high bending resistance compared to metal foil, etc. Therefore, the conductive linear body can be easily bent and has high durability, making it possible to provide a sensor 100 that is excellent in flexibility and durability. Furthermore, compared to metal foil, etc., it is less likely to form convex portions and has a smaller contact area. Therefore, for example, when the adherend 3 is something that comes into contact with the skin, such as clothing, it is preferable in that it feels more comfortable against the skin compared to metal foil, etc. (4) The materials of the first electrode 41 and the second electrode 42, which are adjacent wirings, are different, and these materials have different ionization tendencies. Therefore, even in the absence of a battery, when a substance comes into contact between the first wiring 11 and the second wiring 12, an electromotive force is generated, and this substance can be sensed by the sensor 100.

[0043] [Second embodiment] Next, a second embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 5, the sensor 100A according to this embodiment is formed by weaving a first wiring 11, a second wiring 12, and six non-conductive linear bodies 21 into a braid. In this embodiment, the first wiring 11, the second wiring 12, and the six non-conductive linear bodies 21 are configured in a braided cord, and other than that, the configuration is the same as that of the first embodiment. Therefore, only the changes will be described, and the parts that are common to the previous description will be omitted. In the case where the number of wirings is two as in the present embodiment, if the number of non-conductive linear bodies 21 is six or more, the first wirings 11 and the second wirings 12 can be braided so as not to come into contact with each other. The number of non-conductive linear bodies 21 is the same as in the first embodiment.

[0044] (Operation and effect of the second embodiment) According to this embodiment, in addition to the effects (1), (3) and (4) of the first embodiment, the following effect (5) can be achieved. (5) Because the first wiring 11 and the second wiring 12 are woven into a thread-like shape, the distance between them is very narrow. Therefore, even a small amount of substance can be sensed, and the sensing performance is high.

[0045] [Third embodiment] Next, a third embodiment of the present invention will be described with reference to the drawings. 6, the sensor 100B according to this embodiment includes a first wiring 11, a second wiring 12, and one non-conductive linear body 21. The first wiring 11 and the second wiring 12 are each spirally wound around the one non-conductive linear body 21. In this embodiment, the first wiring 11 and the second wiring 12 have the same configuration as the first embodiment except that each of them is spirally wound around a single non-conductive linear body 21. Therefore, only the changes will be described, and the parts that are common to the previous description will be omitted. The first wiring 11 and the second wiring 12 are each spirally wound around one non-conductive linear body 21. In addition, in a cross-sectional view, the first wiring 11 and the second wiring 12 are located on diagonal lines of the outer peripheral surface of the non-conductive linear body 21, and therefore the first wiring 11 and the second wiring 12 do not come into contact with each other.

[0046] The cross-sectional shape of the non-conductive linear body 21 is not particularly limited and may be polygonal, flat, elliptical, circular, etc., but from the viewpoint of ease of winding the conductive linear body, an elliptical or circular shape is preferable. When the cross section of the non-conductive linear body 21 is circular, the diameter of the non-conductive linear body 21 is preferably 6 μm or more and 3000 μm or less, more preferably 15 μm or more and 1500 μm or less, and particularly preferably 30 μm or more and 900 μm or less. When the cross section of the non-conductive linear body 21 is elliptical, it is preferable that the major axis is in the same range as the diameter of a circular non-conductive linear body 21. Furthermore, when the cross section of the non-conductive linear body 21 is polygonal, it is preferable that the diameter of the outer circumferential circle of the polygon is in the same range as the diameter of a circular non-conductive linear body 21. Furthermore, from the viewpoint of ease of fabrication or performance expression, the diameter ratio (non-conductive linear body / conductive linear body) of the non-conductive linear body 21 to the first wiring 11 and the second wiring 12 (conductive linear body) is preferably 1 / 2 or more, more preferably 1 or more, and particularly preferably 3 or more.

[0047] The diameter of the non-conductive linear body 21 is measured by observing the cross section of the non-conductive linear body 21 using a digital microscope.

[0048] (Operation and effect of the third embodiment) According to this embodiment, in addition to the effects (1), (3) and (4) of the first embodiment, the following effect (6) can be achieved. (6) The distance between the first wiring 11 and the second wiring 12 is very narrow, since it is the same as the diameter of the non-conductive linear body 21. Therefore, even a small amount of material can be sensed, and the sensing performance is high.

[0049] [Fourth embodiment] Next, a fourth embodiment of the present invention will be described with reference to the drawings. 7, the sensor 100C according to this embodiment includes a first wiring 11, a second wiring 12, a third wiring 13, and one non-conductive linear body 21. The first wiring 11, the second wiring 12, and the third wiring 13 are each spirally wound around the one non-conductive linear body 21. In this embodiment, the configuration is the same as that of the third embodiment except that not only the first wiring 11 and the second wiring 12 but also the third wiring 13 is wound around the non-conductive linear body 21, so we will only explain the changes and omit the parts that are common to the previous explanation. The first wiring 11, the second wiring 12, and the third wiring 13 are each spirally wound around one non-conductive linear body 21. In addition, in a cross-sectional view, the first wiring 11, the second wiring 12, and the third wiring 13 are positioned so as to form an equilateral triangle on the outer circumferential surface of the non-conductive linear body 21, and therefore the first wiring 11, the second wiring 12, and the third wiring 13 do not come into contact with each other. Here, it is preferable that the surface materials of the first wiring 11, the second wiring 12, and the third wiring 13 are different from each other. In this way, it is possible to detect the difference in the magnitude of the potential difference that occurs when a substance comes into contact with the first wiring 11, the second wiring 12, and the third wiring 13.

[0050] (Operation and effect of the fourth embodiment) According to this embodiment, in addition to the effects (1), (3), (4) and (6) of the third embodiment, the following effect (7) can be achieved. (7) The difference in magnitude of the potential difference that occurs when a substance comes into contact with the first wiring 11, the second wiring 12, and the third wiring 13 can be detected, and the type of the substance that has come into contact can be determined.

[0051] [Fifth embodiment] Next, a fifth embodiment of the present invention will be described with reference to the drawings. 8, the sensor 100D according to this embodiment includes a first wiring 11, a second wiring 12, a third wiring 13, and one non-conductive linear body 21. The first wiring 11, the second wiring 12, and the third wiring 13 are each spirally wound around the one non-conductive linear body 21. The second wiring 12 is shorter than the first wiring 11, and the third wiring 13 is shorter than the second wiring 12. In this embodiment, the configuration is the same as that of the fourth embodiment except for the lengths of the first wiring 11, second wiring 12, and third wiring 13, so we will only explain the changes and omit the other parts that are common to the previous explanation. In sensor 100D, there are locations around non-conductive linear body 21 where two wires, the first wiring 11 and the second wiring 12, are wound around it, and locations where three wires, the first wiring 11, the second wiring 12, and the third wiring 13, are wound around it. For example, if a substance comes into contact with the location where two wires, the first wiring 11 and the second wiring 12, are wound around it, it cannot be detected by the third wiring 13, but can be detected only by the first wiring 11 and the second wiring 12. Using this, it is possible to determine the location where the substance has come into contact.

[0052] (Operation and effect of the fifth embodiment) According to this embodiment, in addition to the effects (1), (3), (4) and (6) of the third embodiment, the following effect (8) can be achieved. (8) By utilizing the fact that the lengths of the first wiring 11, the second wiring 12, and the third wiring 13 are different, it is possible to determine the location where a substance has come into contact.

[0053] [Modification of the embodiment] The present invention is not limited to the above-described embodiment, and includes modifications and improvements within the scope of achieving the object of the present invention. For example, in the above-described embodiment, the sensing device includes a wireless transmission module 5 that transmits a wireless signal, but this is not limiting. For example, when the sensing module 4 detects contact with a substance, a signal may be sent using a wired signal module. Alternatively, this signal may be sent directly to an information processing terminal and recorded by the information processing terminal. [Explanation of symbols]

[0054] 11...first wiring, 12...second wiring, 13...third wiring, 21...non-conductive linear body, 3...substrate, 4...sensing module, 41...first electrode, 42...second electrode, 5...wireless transmitting module, 6...wireless relay station, 7...sensing server, 100, 100A, 100B, 100C, 100D...sensors.

Claims

1. A thread-like sensor including two or more wires including a conductive wire and one non-conductive wire, the wiring is wound around the non-conductive linear bodies in a spiral shape so as not to come into contact with each other, a diameter ratio of the non-conductive linear body to the wiring is 3 or more; One of the wirings is made of a material different from the other, and the ionization tendencies of the materials are different. Sensor.

2. 2. The sensor of claim 1, The diameter of the conductive linear body is 2 μm or more and 1000 μm or less. Sensor.

3. 3. The sensor according to claim 1, The linear resistance of the conductive linear body is 5.0×10 －３ Ω / cm or more 1.0×10 ３ Ω / cm or less, Sensor.

4. The sensor according to any one of claims 1 to 3, the conductive linear body is at least one selected from the group consisting of a linear body including a metal wire and a linear body including a conductive thread, Sensor.

5. A sensor according to any one of claims 1 to 4; a sensing module for sensing a potential difference between the wirings; a wireless transmission module for transmitting a wireless signal; Sensing device.

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