JP2018112487A - Liquid detection sensor and electrode clip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid detection sensor that can be cut into arbitrary shape and size in a surface direction and can be easily attached to an installation object, and an electrode clip.SOLUTION: A liquid detection sensor 1 comprises: a first electrode layer 2 that has conductivity and liquid permeability; an insulation layer 3 that is arranged opposite to the entire surface of the first electrode layer 2 and exhibits conductivity due to the presence of a liquid permeating through the first electrode layer 2; and a second electrode layer 4 that is arranged opposite to the entire surface of the first electrode layer 2 with the insulation layer 3 therebetween and has conductivity and adhesiveness.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a liquid detection sensor for detecting a liquid and an electrode clip.

  Patent Documents 1 and 2 are examples of liquid detection sensors that can detect liquid. Patent Document 1 includes a water-permeable cloth sheet sandwiched between a porous metal sheet and a non-porous metal sheet, and an aqueous sheet disposed on the porous metal sheet on the opposite side of the non-porous metal sheet. The structure which integrated by fixing the edge part of this by the well-known fixing methods, such as an adhesive agent and an adhesive tape, is disclosed.

  Patent Document 2 has a base portion extending in the longitudinal direction from the terminal portion, at least a pair of comb electrodes composed of a plurality of teeth substantially perpendicular to the base portion, and a hydrophilic non-woven fabric stuck on the comb electrode, The structure which made it easy to adjust length (the number of teeth) according to space by making the base part and tooth | gear of a comb-shaped electrode which make a pair oppose each other with a suitable space | interval respectively is disclosed.

Japanese Patent No. 4349360 JP 2003-222602 A

  However, the above-described conventional configuration has a problem that the handleability during construction is insufficient. Specifically, in Patent Document 1, since the ends of each sheet are integrated by fixing with an adhesive, an adhesive tape, or the like, when the size or shape of the installation target is different, it is adapted to the installation target. Thus, after cutting out into each size and shape, the operation | work which fixes the edge part of each sheet | seat is needed. Moreover, in patent document 2, although the length of a longitudinal direction (one-dimensional direction) is changeable from a terminal part by adjusting the number of teeth, size and a shape are in a surface direction (two-dimensional direction). It is not possible to respond sufficiently to different installation targets. Furthermore, the structure of these patent documents 1 and 2 requires the operation | work which fixes to an installation object with an adhesive agent, an adhesive tape, etc., when attaching to an installation object.

  The present invention has been made in view of the above problems, and an object thereof is to provide a liquid detection sensor and an electrode clip that can be cut into an arbitrary shape and size in the plane direction and can be easily attached to an installation target. And

  This invention is a liquid detection sensor, Comprising: The 1st electrode layer which has electroconductivity and liquid permeability, opposing arrangement | positioning on the whole surface of the said 1st electrode layer, and presence of the liquid which permeate | transmitted the said 1st electrode layer It has an insulating layer that exhibits conductivity, and a second electrode layer that is disposed to face the entire surface of the first electrode layer via the insulating layer and has conductivity and adhesiveness.

  According to the above configuration, since the liquid detection sensor has a laminated structure of the first electrode layer, the insulating layer, and the second electrode layer on the entire surface, the surface direction of the liquid detection sensor (two directions including the vertical direction and the horizontal direction). Since it has a liquid detection ability and a sticking ability at any part in the dimension direction, it can be cut into any shape and size in the plane direction and can be easily attached to the installation target.

  The first electrode layer in the present invention may include a first electrode conductive layer in which a plurality of openings that allow the liquid to pass through are formed of a conductive paint.

  According to said structure, since the size and shape of an opening part can be easily changed with the conductive coating material with a high freedom degree of processing processes, such as a coating process and a printing process, the liquid permeability of a 1st electrode layer Can be easily adjusted according to the application.

  In the first electrode conductive layer according to the present invention, the opening may be formed by intersecting linear portions made of the conductive paint.

  According to the above configuration, the amount of the conductive paint used can be suppressed as compared with the case where the conductive paint is formed on the entire surface, and a continuous connection relationship is obtained by crossing a plurality of linear portions. Therefore, conductivity can be exhibited also in the surface direction of the first electrode conductive layer.

  In the present invention, the first electrode layer is disposed between the first electrode conductive layer and the insulating layer, and has a plurality of openings that allow the liquid that has passed through the first electrode conductive layer to pass therethrough. It may have a layer.

  According to said structure, since a conductive adhesive sheet can be adhere | attached on an insulating layer after printing and apply | coating a conductive coating material to a partial adhesion layer and forming a 1st electrode conductive layer, favorable workability | operativity is obtained. Can be obtained.

  The second electrode layer according to the present invention has one surface bonded to the insulating layer and bonded to the conductive second electrode conductive layer and the other surface of the second electrode conductive layer, and is conductive at least in the thickness direction. And a conductive adhesive layer having adhesiveness.

  According to said structure, the 2nd electrode layer which has adhesiveness and electroconductivity can be formed easily.

  In the second electrode conductive layer of the present invention, one surface is bonded to the insulating layer, and at least one conductive adhesive layer having conductivity in the thickness direction is bonded to the other surface of the conductive adhesive layer. You may have the 2nd electrode conductive sheet which has electroconductivity.

  According to said structure, since it can form in the double-sided tape shape which pinched | interposed the 2nd electrode electroconductive sheet with the electroconductive adhesion layer and the electroconductive adhesion layer, it can join to an insulating layer, Therefore A liquid detection sensor is easy. Can be formed.

  The second electrode layer in the present invention has a second electrode conductive sheet in which a plurality of recesses are dispersedly arranged on the entire surface opposite to the insulating layer side, and an adhesive contained in the recesses. Also good.

  According to said structure, the adhesive accommodated in the recessed part exhibits adhesiveness, and site | parts other than the recessed part in a 2nd electrode electrically conductive sheet exhibit electroconductivity, and it has 2nd adhesiveness and electroconductivity. The electrode layer can be easily formed. Moreover, since the site | parts other than a recessed part become an exposed site | part of a 2nd electrode conductive sheet, an inexpensive material can be used for an adhesive.

  The second electrode layer according to the present invention has a plurality of recesses distributed over the entire surface on the insulating layer side and a plurality of recesses distributed over the entire surface opposite to the insulating layer side. The conductive sheet, the adhesive housed in the concave portion disposed on the insulating layer side in the second electrode conductive sheet, and the concave portion disposed on the side opposite to the insulating layer side in the second electrode conductive sheet And the pressure-sensitive adhesive accommodated in the container.

  According to the above configuration, the insulating layer is formed by arranging the adhesive on the surface on the insulating layer side in the second electrode conductive sheet and forming the double-sided tape with the adhesive disposed on the surface opposite to the insulating layer side. The second electrode layer joined to the substrate can be easily formed. Moreover, since the site | parts other than a recessed part become an exposed site | part of a 2nd electrode conductive sheet, an inexpensive material can be used for an adhesive.

  The second electrode conductive sheet according to the present invention may include a metal-plated fiber mesh structure and an adhesive embedded in the opening of the mesh structure.

  According to said structure, a 2nd electrode conductive sheet can be formed easily.

  The second electrode layer according to the present invention has one surface bonded to the insulating layer and is dispersed and disposed on the entire second electrode conductive layer having conductivity and the other surface of the second electrode conductive layer. You may have with the some adhesion part formed by.

  According to said structure, the adhesive agent which does not have electroconductivity can be used by using the electrode clip provided with the connector part of the material which passes the clearance gap between adjacent adhesive parts and contacts a 2nd electrode conductive layer. As a result, the cost of the liquid detection sensor can be reduced.

  The present invention is an electrode clip that is used by sandwiching a liquid detection sensor between connector parts, and the connector part passes through a gap between adjacent adhesive parts by pressure when the detection sensor is sandwiched. Rigidity and thickness in contact with the second electrode conductive layer. According to said structure, a liquid detection sensor can be reduced in cost.

  It can be cut into any shape and size in the surface direction and can be easily attached to the installation target.

It is a perspective view of a liquid detection sensor. It is explanatory drawing which shows the usage method of a liquid detection sensor. It is a perspective view of a liquid detection sensor. It is explanatory drawing which shows the outline | summary of a liquid detection sensor. It is a perspective view of the 1st electrode conductive layer. It is explanatory drawing of the AA arrow end surface of the liquid detection sensor in FIG. 5A. It is a perspective view of a liquid detection sensor. It is explanatory drawing which shows the outline | summary of a liquid detection sensor. It is explanatory drawing which shows the outline | summary of a liquid detection sensor. It is explanatory drawing which shows the outline | summary of a liquid detection sensor. It is explanatory drawing which shows the outline | summary of a liquid detection sensor. It is explanatory drawing which shows the outline | summary of a liquid detection sensor. It is explanatory drawing which shows the outline | summary of a liquid detection sensor. It is explanatory drawing which shows the use condition of an electrode clip.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

(Liquid detection sensor: Overview)
As shown in FIG. 1, the liquid detection sensor 1 includes a first electrode layer 2 having electrical conductivity and liquid permeability, and a liquid that is disposed to face the entire surface of the first electrode layer 2 and permeates the first electrode layer 2. The insulating layer 3 that exhibits conductivity due to the presence of the second electrode layer 4 and the second electrode layer 4 that is disposed to face the entire surface of the first electrode layer 2 with the insulating layer 3 interposed therebetween and have conductivity and adhesiveness. .

  Here, “conductivity” is a surface that conducts electricity in the surface direction and the thickness direction in a region equal to or larger than the cutting unit in the surface direction (vertical and horizontal two-dimensional directions) of the liquid detection sensor 1. It may have a uniform resistance value at all locations in the direction, or may have a non-uniform resistance value at least at some locations in the plane direction. That is, as long as the first electrode layer 2 and the second electrode layer 4 have conductivity capable of detecting the insulation state and the conduction state by the insulating layer 3 between the first electrode layer 2 and the second electrode layer 4. Good.

  The “cutting unit” is a minimum unit that can be cut into an arbitrary shape and size when the liquid detection sensor 1 is viewed from the thickness direction. By including the “cutting unit”, the liquid detection sensor 1 can cut out an arbitrary shape such as a circular shape, an elliptical shape, a ring shape, or a polygonal shape in various sizes, and the cut-out liquid detection sensor 1 It can be subdivided into any shape and size. Thereby, for example, immediately after manufacturing, a long liquid detection sensor 1 is created, transported and stored in a large roll state, and when transported from a storage location to a detection target on site, a worker can carry or transport the sensor. When the liquid detection sensor 1 for carrying or carrying is cut out into a shape and size suitable for transporting a vehicle, and installed in a detection target, the liquid detection sensor for installation cut out in a shape and size suitable for the installation location of the installation target 1 can be processed.

  “Liquid permeability” means a property that allows liquid to pass through at least in the thickness direction in a region equal to or larger than the cutting unit in the surface direction of the liquid detection sensor 1. “Liquid permeability” may be uniform at all locations in the plane direction or may be non-uniform at least at some locations in the plane direction. In the case of an application in which the time from the start of leaking to the detection of leaking is important, it is preferable that the liquid has a uniform leaking property at all points in the surface direction.

  In the “facing arrangement”, the surfaces of the first electrode layer 2, the insulating layer 3, and the second electrode layer 4 do not have to be completely parallel. The “liquid” is a liquid detection object by the liquid detection sensor 1 and is not limited to the material and physical properties as long as it is liquid. The liquid state means that the insulating layer 3 is fluid enough to be impregnated and stored. As the kind of “liquid”, organic substances such as acids, alkalis, oils, and organic solvents may be used in addition to body fluids, chemicals, and water containing impurities. In addition, the physical property of “liquid” may be any material that is liquefied at the ambient temperature in which the liquid detection sensor 1 is used.

  The “adhesiveness” of the second electrode layer 4 only needs to have a property of adhering to the installation target in a region equal to or larger than the cutting unit in the surface direction of the liquid detection sensor 1. In addition, adhesion means having adhesiveness at least within the environmental temperature range of the installation target, and is not necessarily limited to a state in which the adhesiveness is exhibited at room temperature around 20 degrees Celsius. For example, in the case where the environmental temperature range of the installation target is around 100 degrees Celsius, even if the adhesiveness is lost at room temperature, if the adhesiveness is around 100 degrees Celsius, it corresponds to the “adhesiveness” of the second electrode layer 4 To do. Examples of the adhesive exhibiting “adhesiveness” at room temperature include acrylic resins, rubber resins, silicon resins, urethane resins, and elastomer resins.

  “Adhesiveness” does not necessarily mean a state in which the liquid detection sensor 1 is attached to an installation target so as to be detachable, and does not necessarily mean that the adhesive is attached by an adhesive. For example, when the installation target has magnetism, the second electrode layer 4 may have a magnetic force in the thickness direction, and may be attached to the installation target by the magnetic force. Further, one or more of the first electrode layer 2, the insulating layer 3, and the second electrode layer 4 may have a magnetic force in the thickness direction. Further, “adhesiveness” may be realized by static electricity of the second electrode layer 4. In this case, since the adhesiveness is exhibited with respect to various materials, the types and materials of installation targets can be expanded. Furthermore, “adhesiveness” may be realized by a combination of one or more of the above-mentioned adhesive, magnetic force, and static electricity. In this case, for example, after temporarily fixing with magnetic force or static electricity, after alignment, the liquid detection sensor 1 can be strongly pressed against the installation target and pasted with an adhesive for a long period of time.

  According to the above configuration, the liquid detection sensor 1 is the liquid detection sensor 1 having the laminated structure of the first electrode layer 2, the insulating layer 3, and the second electrode layer 4 on the entire surface. It has a liquid detection ability and a sticking ability at an arbitrary site in the surface direction. Accordingly, the liquid detection sensor 1 can be cut into an arbitrary shape and size in the surface direction and can be easily attached to the installation target. For example, as shown in FIG. 2, the liquid detection sensor 1 is cut in the direction indicated by the solid line with respect to the large liquid detection sensor 1 to form a long and thin strip-shaped liquid detection sensor 1, and this liquid detection sensor 1 can be attached along the longitudinal direction of the optical fiber cable 6 to be installed. Thereafter, the installation work can be completed by sandwiching both surfaces (first electrode layer 2 and second electrode layer 4) at one end of the liquid detection sensor 1 with the electrode clip 5.

  In the liquid detection sensor 1, a release sheet having the same shape as the outer shape may be provided on the upper surface (exposed surface of the first electrode layer 2) and the lower surface (exposed surface of the second electrode layer 4). The release sheet makes it possible to maintain the adhesiveness of the second electrode layer 4 over a long period of time and to exhibit the adhesiveness to the installation target of the liquid detection sensor 1 only when necessary. Further, the liquid detection sensor 1 configured as described above may be easily cut by manual operation by having perforations for cutting in the vertical direction, the horizontal direction, and the oblique direction.

(Liquid detection sensor: first electrode layer)
As shown in FIG. 1, the 1st electrode layer 2 has the 1st electrode conductive layer 21 in which the several opening part 21a which permeate | transmits a liquid was formed with the electroconductive coating material. Thereby, since the liquid detection sensor 1 can change easily the size and shape of the opening part 21a with the electroconductive coating material with a high freedom degree of processing processes, such as a coating process and a printing process, the 1st electrode layer 2 can be changed. The liquid permeability can be easily adjusted according to the application.

  A conductive paint becomes a thin film when spread on the surface of an object in a fluidized state, and as a time passes, it becomes a solid film that adheres to the surface of the object and continuously covers the surface and exhibits conductivity. Examples thereof include liquid conductive ink and pasty conductive paste.

  Examples of the conductive paste include silver paste, silver-coated copper paste, and carbon paste.

  The first electrode conductive layer 21 formed of a conductive paint will be described in detail. The first electrode conductive layer 21 has an opening 21a formed by intersecting linear portions 211 made of a conductive paint. . That is, the opening 21a is formed by being surrounded by three or more intersecting linear portions 211 so as to have a polygonal shape having three or more intersections (vertices) at which the linear portions 211 intersect. Yes. Thereby, the 1st electrode conductive layer 21 is because the usage-amount of a conductive paint is suppressed rather than the case where it forms in a sheet form using a conductive paint, and the some linear part 211 cross | intersects. By having a continuous connection relationship, it has conductivity in the thickness direction and the surface direction, as in the case of forming a sheet using a conductive paint.

  The linear part 211 may be either a straight line or a curve, or a combination thereof. The linear portion 211 preferably has a width that is narrower than the maximum diameter or average diameter of the opening 21a. Moreover, it is preferable that the linear part 211 is thickness (height) smaller than the maximum diameter and average diameter of the opening part 21a. Thereby, the 1st electrode conductive layer 21 can obtain easily favorable liquid permeability by a large opening area.

  Moreover, the linear part 211 may be arrange | positioned in parallel with respect to the vertical direction and horizontal direction of the 1st electrode conductive layer 21, and may be arrange | positioned incline. The thickness (height) and the line width of the intersecting one linear portion 211 and the other linear portion 211 may be the same or different. If the thickness (height) of one of the linear portions 211 is reduced or the line width is reduced, the amount of conductive paint used can be further reduced. For example, for one linear portion 211 that contacts the connector portion of the electrode clip 5, the line width is increased and the thickness (height) is set to a predetermined value suitable for contact, and the other linear portion 211 is set. By reducing the line width and reducing the thickness (height), the amount of conductive paint used can be reduced.

(Liquid detection sensor: first electrode layer: partial adhesive layer)
The first electrode layer 2 is disposed between the first electrode conductive layer 21 and the insulating layer 3 and has a partial adhesive layer 22 having a plurality of openings that allow the liquid that has passed through the first electrode conductive layer 21 to pass therethrough. doing. The lower limit of the ratio (opening ratio) between the bonded portion and the non-bonded portion in the partial adhesive layer 22 is 1: 9, preferably 2: 8, and more preferably 4: 6. Moreover, the upper limit of the ratio (opening ratio) between the bonded portion and the non-bonded portion is 9 to 1, 8 to 2 is preferable, and 6 to 4 is more preferable.

As the partial adhesive layer 22, a liquid-permeable sheet-like adhesive layer having a porous structure can be applied. Examples of the adhesive constituting the sheet-like adhesive layer include polyurethane, polyester, polyamide, polyolefin, and EVA. Moreover, the partial adhesive layer 22 can apply the molded product which shape | molded hot-melt resin in the woven fabric, the nonwoven fabric, the knitted fabric, the net shape, the lattice shape, etc. The hot-melt resin has a thermoplastic resin as a main component, and the melting point is preferably 200 ° C. or lower, more preferably 150 ° C. or lower. Also, the basis weight is preferably from 100 g / m ² or less, 50 g / m ² or less is more preferable.

  Thereby, the liquid detection sensor 1 includes a process of forming the first electrode conductive layer 21 having the linear portions 211 and the like by printing or applying a conductive paint on the partial adhesive layer 22, and the first electrode conductive layer 21. By fusing the partial adhesive layer 22 to the insulating layer 3 by performing the process of laminating the attached partial adhesive layer 22 on the insulating layer 3 and the process of heating and pressing in the laminating direction while maintaining the laminated state The first electrode layer 2 can be bonded to the insulating layer 3 so as to allow liquid permeation.

  The partial adhesive layer 22 may have electrical conductivity or may not have electrical conductivity. If the liquid does not have conductivity, the liquid can be detected when the liquid exists in the opening of the partial adhesive layer 22 and the insulating layer 3. On the other hand, in the case of having conductivity, the liquid can be detected as long as the liquid exists in the insulating layer 3 even if the liquid does not exist in the opening of the partial adhesive layer 22. That is, in the case of conductivity, it is possible to detect a slight leakage, and after the liquid has dried from the surface side that has entered the liquid detection sensor 1, as long as the liquid exists in the insulating layer 3, the past leakage may be detected. The liquid can be detected continuously.

(Liquid detection sensor: first electrode layer: modification)
In the above liquid detection sensor 1, although the case where the 1st electrode layer 2 was provided with the 1st electrode conductive layer 21 formed of the linear part 211 was demonstrated, it is not limited to this. For example, as shown in FIG. 3, the first electrode conductive layer 21 may be formed by a metal sheet having an opening 21a, metal plating, or metal coating.

  As shown in FIG. 4, the first electrode conductive layer 21 is a conductive sheet 212 having an opening 212a and a filling hole 212b in a penetrating state, and the filling hole 212b is filled with the thermoplastic adhesive 23. May be. In this case, with the conductive sheet 212 and the insulating layer 3 in contact with each other, the first electrode is electrically conductive by heating and pressurizing in the thickness direction to fuse the thermoplastic adhesive 23 to the insulating layer 3. The layer 21 (conductive sheet 212) and the insulating layer 3 can be directly bonded. As a result, the liquid detection sensor 1 in which the partial adhesive layer 22 is reduced can be obtained.

  The conductive sheet 212 may be made of any material as long as it has conductivity. As a material for forming the conductive sheet 212, nickel, copper, silver, tin, gold, palladium, aluminum, chromium, titanium, carbon, zinc, or an alloy containing two or more of these can be used. . Among these, metals such as aluminum and copper are preferable.

  Further, as shown in FIG. 5A, the first electrode conductive layer 21 has an end surface shape of a cross section in two line segments (AA line, BB line, etc.) intersecting in a plane direction, and has a waveform shape or an uneven shape. A plurality of openings 213 a may be formed in the conductive sheet 213, and the thermoplastic adhesive 23 may be accommodated in the recess on the insulating layer 3 side. In this case, for example, as shown in 5B showing the end surface shape of the AA line, when the conductive sheet 213 is brought into contact with the insulating layer 3 and then pressed and heated, the thermoplastic adhesive 23 is melted, The thermoplastic adhesive 23 accommodated in the concave portion 213b of the conductive sheet 213 comes into contact with the insulating layer 3 by elastically deforming at least the top of the convex portion 213c in contact with the insulating layer 3. Then, by finishing the heating while maintaining the pressurized state, the state in which the conductive sheet 213 is in contact with the insulating layer 3 is maintained when the thermoplastic adhesive 23 is solidified and fixed to the insulating layer 3. As a result, like the first electrode conductive layer 21 in FIG. 4, the liquid detection sensor 1 in which the partial adhesive layer 22 is reduced can be obtained. Moreover, since the filling amount of the thermoplastic adhesive 23 can be adjusted by adjusting the depth (height) of the unevenness, the adhesive strength can be adjusted. Furthermore, since the conductive sheet 213 is in contact with the insulating layer 3, any conductive or non-conductive thermoplastic adhesive 23 can be used.

  In addition, as for the electroconductive sheet 213, the end surface shape of the cross section in the arbitrary line segments of a plane direction may be formed in the waveform shape or uneven | corrugated shape. In addition, instead of the thermoplastic adhesive 23, the conductive sheet 213 may contain an adhesive that solidifies at room temperature in the recess 213b.

(Liquid detection sensor: insulation layer)
The insulating layer 3 exhibits conductivity due to the presence of the liquid. That is, the insulating layer 3 is in an insulated state with a high resistance value when the liquid is not impregnated, and becomes conductive with a small resistance value when the liquid is present. Therefore, when the insulating layer 3 is not impregnated with liquid, the insulating layer 3 is not electrically connected between the first electrode layer 2 and the second electrode layer 4.

  The insulating layer 3 has a structure that exhibits conductivity due to the presence of the liquid and absorbs and holds the liquid. That is, the insulating layer 3 is configured to change from insulating to conductive as a whole due to the penetration of the liquid.

  The “liquid absorbing / holding structure” provided in the insulating layer 3 is not limited to the material and shape as long as it is a structure through which the liquid that is the detection target penetrates. Examples include a nonwoven structure, a porous structure having open cells, a structure in which one or more holes are formed in a nonporous material, and a structure in which one or more slits are formed in a nonporous material. When the insulating layer 3 is a non-woven fabric or paper, even a small amount of liquid penetrates into the insulating layer 3 due to capillary action and changes from an insulating state to a conductive state. Therefore, the sheet member 1 with high detection accuracy. It can be.

  The material of the insulating layer 3 is not particularly limited as long as the material has a high resistance value when not in contact with the liquid. For example, a nonwoven fabric, a gauze, a bandage, a bandage, a paper tape, etc. can be used for the insulating layer 3.

  Specifically, as the material of the insulating layer 3, plant fibers (cellulose fibers) such as cloth (cotton, hemp) and paper, chemical fibers (rayon, cupra, etc.), ceramics, engineering plastics, porous materials (sponge etc.) ) Is exemplified. Engineering plastics include polypropylene, crosslinked polyethylene, polyester, polybenzimidazole, aramid, polyimide, polyimideamide, polyetherimide, polyphenylene sulfide (PPS), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), and the like.

More specifically, a nonwoven fabric made of a polyester resin manufactured by Unitika Ltd. (registered trademark: MARIX) can be used for the insulating layer 3. This nonwoven fabric has hydrophilicity because the resin for adhering the polyester fibers is a water-soluble acrylic resin. In addition, the manufacturing method of said nonwoven fabric is a spun bond method. When the nonwoven fabric product number is # 20507WTD, the basis weight is 50 g / m ² and the average thickness is 155 μm. When the nonwoven fabric product number is # 20604FLD, the basis weight is 60 g / m ² and the average thickness is 150 μm. When the nonwoven fabric product number is # 10606WTD, the basis weight is 60 g / m ² and the average thickness is 215 μm (with bulkiness).

  The thickness of the insulating layer 3 is preferably 10 to 3000 μm. Moreover, it is preferable that the insulating layer 3 has lyophilicity with respect to the liquid which is a detection target. For example, if the liquid to be detected is water, it is preferably hydrophilic. With a lyophilic structure, even a small amount of liquid penetrates into the insulating layer 3 and changes from an insulating state to a conductive state. Therefore, even a small amount of liquid can be detected, and the time until detection can be shortened.

  The insulating layer 3 may be a material having a lyophilic property or having a lyophilic layer formed on the surface of a lyophobic material. For example, the insulating layer 3 may have a surfactant having surface activity with respect to the liquid attached to at least a part of the contact portion with the liquid in the liquid absorption / holding structure. In this case, the sheet member 1 that can select the detection target such as water or oil can be obtained by properly using the type of the surfactant according to the type of the liquid to be detected.

  Furthermore, the insulating layer 3 may be attached with a dissolving material (inorganic salts: sodium chloride, sodium sulfate, calcium chloride, magnesium hydroxide, etc.) that is dissolved and ionized in a liquid. In this case, even if the liquid itself has no conductivity (pure water, oil, etc.), the dissolved material ionized by this liquid can change the insulating layer 3 to be conductive.

(Liquid detection sensor: second electrode layer: second electrode conductive layer)
As shown in FIG. 6, the second electrode layer 4 has one surface bonded to the insulating layer 3 and bonded to the second electrode conductive layer 41 having conductivity and the other surface of the second electrode conductive layer 41, It has the electroconductive adhesion layer 42 which has electroconductivity at least while having electroconductivity in the thickness direction.

  Examples of the second electrode conductive layer 41 include a metal sheet, a metal foil, and a coating layer formed of an isotropic conductive adhesive or conductive paint that is solidified at room temperature. The conductive adhesive layer 42 is exemplified by an isotropic conductive adhesive or an anisotropic conductive adhesive having adhesiveness at room temperature.

  As shown in FIG. 1, the second electrode conductive layer 41 has one surface bonded to the insulating layer 3 and has conductivity in at least the thickness direction, and one surface other than the conductive adhesive layer 411. It has a second electrode conductive sheet 412 bonded to the surface and having conductivity. According to this configuration, since the conductive adhesive layer 411 and the conductive adhesive layer 42 are formed in a double-sided tape shape with the second electrode conductive sheet 412 sandwiched therebetween, the liquid detection sensor can be bonded to the insulating layer 3. 1 can be formed easily.

  The conductive adhesive layer 411 includes a resin and conductive particles. Examples of the resin material include acrylic resin, silicon resin, thermoplastic elastomer resin, rubber resin, polyester resin, and the like. Specific examples include KP-1581, KP-1104, KP-2074, and SZ-6153 manufactured by Nippon Carbide, and AR-2172-M3 manufactured by Big Technos. Part or all of the conductive particles are formed of a metal material.

  Examples of conductive particle materials include copper powder, silver powder, nickel powder, silver-coated copper powder (Ag-coated Cu powder), gold-coated copper powder, silver-coated nickel powder (Ag-coated Ni powder), and gold-coated nickel. There are powder and carbon powder, and these metal powders can be produced by a water atomization method, a carbonyl method or the like. In addition to the above, particles obtained by coating a metal powder with a resin and particles obtained by coating a resin with a metal powder can also be used. In addition, it is preferable that electroconductive particle is Ag coat Cu powder or Ag coat Ni powder. This is because conductive particles having improved conductivity can be obtained from an inexpensive material.

  The second electrode conductive sheet 412 may be made of any material as long as it has conductivity, like the conductive sheet 212 described above. As a material for forming the conductive sheet 212, nickel, copper, silver, tin, gold, palladium, aluminum, chromium, titanium, carbon, zinc, or an alloy containing two or more of these is used. it can. Among these, metals such as aluminum and copper are preferable.

(Liquid detection sensor: second electrode layer: modification)
In the above description, the second electrode layer 4 is configured such that the first electrode layer 2 includes the second electrode conductive layer 41 and the conductive adhesive layer 42, but is not limited thereto. . Specifically, as shown in FIG. 7, the second electrode layer 4 includes a flat plate-like second electrode conductive sheet 413 in which a plurality of concave portions 413 a are dispersedly arranged on the entire surface opposite to the insulating layer 3 side. The structure having the adhesive 43 accommodated in the recess 413a may be used. According to this configuration, the pressure-sensitive adhesive 43 accommodated in the concave portion 413a exhibits adhesiveness, and the portions other than the concave portion 413a in the second electrode conductive sheet 413 exhibit electrical conductivity, thereby having adhesiveness and conductivity. The second electrode conductive layer 41 (second electrode layer 4) can be easily formed. In addition, since a portion other than the concave portion 413 a becomes an exposed portion of the second electrode conductive sheet 413, an inexpensive material can be used for the adhesive 43.

  In addition, the second electrode conductive sheet 413 has a plurality of concave portions 413a distributed over the entire surface on the insulating layer 3 side and the entire surface opposite to the insulating layer side, and the adhesive 43 is accommodated in these concave portions 413a. May be. That is, the second electrode layer 4 includes a plurality of recesses 413a distributed over the entire surface on the insulating layer 3 side, and a plurality of recesses 413a distributed over the entire surface opposite to the insulating layer 3 side. The electrode conductive sheet 413, the adhesive 43 accommodated in the recess 413a disposed on the insulating layer 3 side in the second electrode conductive sheet 413, and the side opposite to the insulating layer 3 side in the second electrode conductive sheet 413 are disposed. The adhesive 43 contained in the recessed portion 413a may be used.

  According to the above configuration, the insulating layer 3 is obtained by forming the double-sided tape-like second electrode conductive sheet 413 in which the adhesive 43 is disposed on the surface on the insulating layer 3 side and the surface opposite to the insulating layer side, respectively. The second electrode conductive layer 41 (second electrode layer 4) bonded to the substrate can be easily formed, and the conductive adhesive layer 411 can be reduced. Moreover, since parts other than the recessed part 413a become the exposed part (electrical contact part) of the second electrode conductive sheet, and the adhesive 43 does not need conductivity, an inexpensive material can be used for the adhesive 43.

  In addition, as shown in FIG. 8, as for the 2nd electrode conductive sheet 416, the end surface shape of the cross section in the two line segments which cross | intersect in a plane direction may be formed in the waveform shape or uneven | corrugated shape. In this case, it is possible to easily form the plurality of recesses 416a that are substantially uniformly distributed. According to this configuration, when the second electrode conductive sheet 416 is brought into contact with the installation target, the adhesive 43 accommodated in the concave portion 416a on the side opposite to the insulating layer 3 side adheres to the installation target, and at least in the convex portion 416b. The top part comes into contact with the connector part of the electrode clip 5.

  Furthermore, as shown in FIG. 9, the corrugated or uneven second electrode conductive sheet 416 contains the adhesive 43 in the recess 416 c on the insulating layer 3 side and the recess 416 a on the opposite side to the insulating layer 3 side, respectively. You may do it. In this case, the second electrode conductive sheet 416 can be directly bonded to the insulating layer 3 and the conductive adhesive layer 411 can be reduced. The second electrode conductive sheet 416 in FIGS. 8 and 9 may be formed such that the end face shape of the cross section in an arbitrary line segment in the planar direction is a wave shape or an uneven shape.

  As shown in FIG. 10, the second electrode conductive sheet 414 may have a configuration in which a plurality of through holes 414 a are distributed over the entire surface and the through holes 414 a are filled with an adhesive 43. According to this configuration, it is possible to easily form the double-sided tape-like second electrode conductive sheet 414 in which the adhesive 43 is disposed on both sides.

  In addition, as shown in FIG. 11, the second electrode conductive sheet 414 includes a metal-plated fiber mesh structure 415 and an adhesive 43 embedded in the opening 415 a of the mesh structure 415. May be. According to said structure, since it is not necessary to form the opening part 415a, the 2nd electrode conductive sheet 414 can be obtained easily.

  In addition, as shown in FIG. 12, the second electrode layer 4 has one surface bonded to the insulating layer 3, the conductive second electrode conductive layer 41, and the entire other surface of the second electrode conductive layer 41. And a plurality of adhesive portions 421 formed of an adhesive. According to said structure, by using the electrode clip 5 provided with the connector part of the material which passes the clearance gap between the adjacent adhesion parts 421 and contacts the 2nd electrode conductive sheet 412, non-conductive adhesive is used. Since it can be used, the cost of the liquid detection sensor 1 can be reduced.

(Electrode clip)
As shown in FIG. 12, the electrode clip 5 is used by sandwiching the liquid detection sensor 1 between the connector portions 51 and 52. The connector part 51 has rigidity and thickness that contact the second electrode conductive sheet 412 (second electrode conductive layer 41) through the gap between the adjacent adhesive parts 421 by the pressure when the liquid detection sensor 1 is sandwiched. Have.

  More specifically, the electrode clip 5 includes a movable clamping part 514 and a fixed clamping part 515 that can clamp the liquid detection sensor 1 in the thickness direction. These movable holding part 514 and fixed holding part 515 are preferably formed of a material such as synthetic resin or ceramics having dimensional stability and electrical insulation. The connector part 52 is provided in the movable clamping part 514 so as to be in contact with the first electrode conductive layer 21. On the other hand, the connector part 51 is provided in the fixed clamping part 515 so that it may contact | abut to the 2nd electrode conductive sheet 412. FIG.

  The connector portions 51 and 52 may be made of any material as long as they have conductivity. As a material for forming the connector side electrode members 211a and 211b, nickel, copper, silver, tin, gold, palladium, aluminum, chromium, titanium, carbon, zinc, or an alloy containing two or more of these Etc. can be used. Among these, metals such as aluminum and copper are preferable.

  The connector portion 51 is set to have such a rigidity and thickness that the connector portion 51 comes into contact with the second electrode conductive sheet 412 through a gap between the adjacent adhesive portions 421 by pressure when the liquid detection sensor 1 is sandwiched. For example, the connector 51 is formed of a structure made of a non-woven fabric of a conductive material such as metal or a structure in which a plurality of conductive sheets are stacked so as to be deformable in the thickness direction.

  In the above detailed description, the present invention has been described mainly with respect to characteristic parts so that the present invention can be more easily understood. However, the present invention is not limited to the embodiments described in the above detailed description, and other implementations are possible. It can also be applied to forms and its scope should be interpreted as widely as possible.

  The terms and terminology used in the present specification are used to accurately describe the present invention, and are not used to limit the interpretation of the present invention. Moreover, it would be easy for those skilled in the art to infer other configurations, systems, methods, and the like included in the concept of the present invention from the concept of the invention described in this specification. Accordingly, the description of the claims should be regarded as including an equivalent configuration without departing from the technical idea of the present invention. In addition, in order to fully understand the object of the present invention and the effects of the present invention, it is desirable to fully consider the literatures already disclosed.

DESCRIPTION OF SYMBOLS 1 Liquid detection sensor 2 1st electrode layer 21 1st electrode conductive layer 21a Opening part 21b Filling hole 211 Linear part 22 Partial adhesion layer 23 Thermoplastic adhesive 3 Insulating layer 4 2nd electrode layer 41 2nd electrode conductive layer 411 Conductivity Conductive adhesive layer 412 second electrode conductive sheet 42 conductive adhesive layer 5 electrode clip

Claims (11)

A first electrode layer having electrical conductivity and liquid permeability;
An insulating layer disposed opposite to the entire surface of the first electrode layer and exhibiting conductivity due to the presence of the liquid that has passed through the first electrode layer;
A liquid detection sensor comprising: a second electrode layer disposed on the entire surface of the first electrode layer so as to face each other through the insulating layer and having conductivity and adhesiveness. The first electrode layer includes
The liquid detection sensor according to claim 1, wherein the plurality of openings that allow the liquid to pass through have a first electrode conductive layer formed of a conductive paint. The first electrode conductive layer includes:
The liquid detection sensor according to claim 2, wherein the opening is formed by intersecting linear portions made of the conductive paint. The first electrode layer includes
It has a partial adhesion layer which has a plurality of openings which are arranged between the 1st electrode conductive layer and the insulating layer, and permeate the liquid which permeated the 1st electrode conductive layer. The liquid detection sensor according to any one of claims 2 to 4. The second electrode layer includes
A second electrode conductive layer having one surface bonded to the insulating layer and having conductivity;
The liquid detection sensor according to claim 1, further comprising: a conductive adhesive layer that is bonded to the other surface of the second electrode conductive layer and has conductivity in at least a thickness direction and has adhesiveness. . The second electrode conductive layer is
A conductive adhesive layer having one side bonded to the insulating layer and having conductivity in at least the thickness direction;
6. The liquid detection sensor according to claim 5, further comprising: a second electrode conductive sheet having one surface bonded to the other surface of the conductive adhesive layer and having conductivity. The second electrode layer includes
A second electrode conductive sheet in which a plurality of recesses are dispersedly disposed on the entire surface opposite to the insulating layer side;
The liquid detection sensor according to claim 1, further comprising an adhesive contained in the recess. The second electrode layer includes
A second electrode conductive sheet having a plurality of recesses distributed over the entire surface on the insulating layer side and a plurality of recesses distributed over the entire surface opposite to the insulating layer side;
An adhesive housed in the recess disposed on the insulating layer side of the second electrode conductive sheet;
2. The liquid detection sensor according to claim 1, further comprising: an adhesive contained in the concave portion disposed on the opposite side of the second electrode conductive sheet from the insulating layer side.   The liquid detection sensor according to claim 8, wherein the second electrode conductive sheet includes a metal-plated fiber mesh structure and an adhesive embedded in an opening of the mesh structure. The second electrode layer includes
A second electrode conductive layer having one surface bonded to the insulating layer and having conductivity;
2. The liquid detection sensor according to claim 1, wherein the liquid detection sensor includes a plurality of adhesive portions that are dispersedly disposed on the entire other surface of the second electrode conductive layer and are formed of an adhesive. An electrode clip used by sandwiching the liquid detection sensor according to claim 10 between connector parts,
The connector clip has a rigidity and a thickness that contact the second electrode conductive layer through a gap between the adjacent adhesive portions by pressure when the detection sensor is sandwiched.

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