WO2013187336A1 - Liquid detection sensor - Google Patents

Description

Liquid detection sensor

The present invention relates to a liquid detection sensor for detecting a liquid such as water or oil.

Conventionally, there is a sensor as disclosed in Patent Document 1 as a sensor for detecting leakage. In Patent Document 1, at least two foil-shaped electrodes that are spaced apart and parallel to each other are sandwiched between a synthetic resin tape and a synthetic resin nonwoven fabric tape, and these are fixed to each other, and the synthetic resin nonwoven fabric tape contacts the skin. There is disclosed a flexible liquid leakage detection device in which an adhesive material layer having an arbitrary shape is provided on a surface.

Japanese Utility Model Publication No. 5-79468

By the way, conventionally, the electrode member (foil-like electrode) provided on the base material (synthetic resin tape) is covered with an insulating sheet (non-woven fabric made of synthetic resin), and the adhesive impregnated in the insulating sheet is adhered to the base material. Then, the insulating sheet is indirectly pressed against the electrode member. However, since the liquid to be detected does not permeate at the location where the adhesive is impregnated in the insulating sheet, the adhesive cannot be impregnated on the entire surface of the insulating sheet. Therefore, there is a problem in that the accuracy of detection when the liquid leaks is lowered because the liquid does not permeate through the adhesive at a part where the liquid is desired to be detected.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a liquid detection sensor capable of reliably detecting leakage.

The liquid detection sensor of the present invention has an insulating sheet that exhibits electrical conductivity due to the presence of liquid, and has electrical conductivity and adhesiveness, and is provided in contact with one surface of the insulating sheet due to the adhesiveness. And a plurality of electrode members electrically separated from each other.

According to the above configuration, the electrode member and the insulating sheet are brought into contact with each other by directly joining the electrode member and the insulating sheet by the adhesiveness of the electrode member. Therefore, the liquid can be reliably detected.

Further, the electrode member in the present invention may have a conductive adhesive layer bonded to one surface of the insulating sheet.

According to said structure, since the electrode member by a conductive adhesive layer can be formed by simple processes, such as application | coating and printing of the conductive adhesive with respect to an insulating sheet, a liquid detection sensor can be formed easily. it can.

Further, the conductive adhesive layer in the present invention may be formed by printing or applying a conductive adhesive on the insulating sheet.

Further, the conductive adhesive layer in the present invention may be provided in contact with one surface of the insulating sheet by transfer printing.

According to the above configuration, the electrode member and the insulating sheet are brought into contact with each other by directly joining the electrode member and the insulating sheet by the adhesiveness of the electrode member. Therefore, the liquid can be reliably detected. In addition, the electrode member forming method includes a direct printing method and a transfer printing method. However, in the present invention, a plurality of electrode members are formed by a transfer printing method, so that in general gravure printing, screen printing, and rotary screen printing, the type of a substrate to be printed (insulating sheet) such as nonwoven fabric or gauze is used. Therefore, it is possible to prevent bleeding that occurs during direct printing. As a result, since the width and layer thickness of the electrode member can be easily controlled, a desired electrode member such as a stable resistivity can be formed.

Further, the electrode member in the present invention may further include a metal layer laminated on a surface of the conductive adhesive layer opposite to the insulating sheet side.

According to the above configuration, by forming the electrode member with the conductive adhesive layer and the metal layer, a part of the electrode member can be easily used as a signal terminal.

Moreover, the said several electrode member in this invention may have the said electroconductivity and adhesiveness by having the electroconductive adhesive containing an adhesive.
According to said structure, it has electroconductivity and adhesiveness because an electrode member has a conductive adhesive containing an adhesive. Thereby, an electrode member can be transcribe | transferred to an insulating sheet by pressurizing.

Further, the electrode member and the insulating sheet in the present invention may be provided with an overcoat resin layer except for one end portion sandwiched between clips.
According to said structure, the electrical conduction failure of the electrode member by an insulating sheet being extended with external force can be prevented.

Further, the electrode member in the present invention may further have a protective layer laminated on the surface exposed from the insulating sheet.

According to the above configuration, when the electrode member comes into contact with the detection site, the protective layer can prevent direct contact between the metal layer or the conductive adhesive layer and the detection site.

The liquid detection sensor according to the present invention further includes an adhesive member that holds the insulating sheet and the electrode member and covers the insulating sheet and the electrode member, and has adhesiveness at least on an exposed surface. You may do it.

According to the above configuration, the liquid detection sensor can be easily attached to a desired location by the adhesive member.

Moreover, the said adhesive member in this invention is formed in the sheet | seat shape which has the through-hole, The said electrode member is hold | maintained in the one surface side of the said adhesive member, and an edge part passes through the said through-hole. You may be located in the other surface side.

According to said structure, after attaching the one surface side of the adhesion member in a liquid detection sensor to a desired location in a contact state, the edge part of the said electrode member located in the other surface side can be used as a signal terminal. As a liquid detection sensor, a series of setting operations from attachment to detection can be performed easily and in a short time.

Liquid leakage can be detected reliably.

It is explanatory drawing of a liquid detection sensor. It is explanatory drawing which shows the cross-section of a liquid detection sensor. It is explanatory drawing which shows the cross-section of a liquid detection sensor. It is a disassembled perspective view of a liquid detection sensor. It is explanatory drawing which shows the usage condition of a liquid detection sensor. It is explanatory drawing which shows the modification of a liquid detection sensor. It is explanatory drawing which shows the modification of a liquid detection sensor. It is explanatory drawing which shows the modification of a liquid detection sensor. It is explanatory drawing which shows the modification of a liquid detection sensor. It is explanatory drawing which shows the modification of a liquid detection sensor. It is explanatory drawing which shows the modification of a liquid detection sensor. It is explanatory drawing which shows the modification of a liquid detection sensor. It is explanatory drawing which shows the modification of a liquid detection sensor. It is explanatory drawing which shows the modification of a liquid detection sensor. It is explanatory drawing which shows the modification of a liquid detection sensor.

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

(Outline of liquid detection sensor)
As shown in FIG. 1, a liquid detection sensor 1 according to the present embodiment has an insulating sheet 4 that exhibits conductivity by the presence of a liquid, and has conductivity and adhesiveness. A plurality of electrode members 5 are provided in contact with each other and are electrically separated from each other. The liquid detection sensor 1 is installed such that the insulating sheet 4 is on the liquid detection target side. Thereby, when the liquid leaks from the target, the liquid can be detected by allowing the liquid to permeate the insulating sheet 4 and exhibiting conductivity and conducting between the plurality of electrode members 5.

Here, “liquid” is a liquid detection object by the liquid detection sensor 1 and is not limited to a material or physical property as long as it is liquid. The liquid state means that the insulating sheet 4 is fluid enough to be impregnated. The “liquid” may be a body fluid, a chemical solution, pure water or water containing impurities, or an organic substance such as an acid, an alkali, an oil, or an organic solvent. 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.

Thus, in the liquid detection sensor 1, the electrode member 5 and the insulating sheet 4 are brought into contact with each other by directly joining the electrode member 5 and the insulating sheet 4 by the adhesiveness of the electrode member 5. Therefore, the liquid can be reliably detected.

The electrode member 5 is not limited to having conductivity as a whole. The electrode member 5 only needs to have a place where the insulating sheet 4 is energized when the insulating sheet 4 exhibits maximum conductivity. That is, the electrode member 5 may have a multilayer structure including an insulating layer. Moreover, the electrode member 5 should just be able to form the electrical connection from the electricity supply location with the insulating sheet 4 to the exterior.
Moreover, the electrode member 5 is not limited to having adhesiveness as a whole. The electrode member 5 should just have adhesiveness in a contact location with the insulating sheet 4 at least.
Further, the entire surface is not limited to being bonded to the insulating sheet 4. For example, the electrode member 5 may be bonded so as to protrude from the insulating sheet 4.

Such an electrode member 5 is realized by the following configuration. For example, as illustrated in FIG. 1, the electrode member 5 may have a configuration in which a conductive adhesive layer 51, a metal layer 52, and a resin layer 53 are sequentially stacked from the insulating sheet 4 side. Further, the electrode member 5 may have a configuration in which the conductive adhesive layer 51 and the metal layer 52 are sequentially laminated from the insulating sheet 4 side. Further, the electrode member 5 may be configured only with the conductive adhesive layer 51. Further, the electrode member 5 may have a configuration in which the conductive adhesive layer 51 and the resin layer 53 are sequentially laminated from the insulating sheet 4 side. In addition, you may include the adhesive bond layer which adhere | attaches each layer on these.

Thus, it is preferable to have the conductive adhesive layer 51 bonded to one surface of the insulating sheet 4. Thereby, the electrode member 5 can exhibit electroconductivity and adhesiveness. Further, since the conductive adhesive layer 51 can be formed by a simple process such as application, printing, and transfer of the conductive adhesive to the insulating sheet 4, the liquid detection sensor 1 can be easily formed.
Moreover, the electrode member 5 may further have a metal layer 52 laminated on the surface of the conductive adhesive layer 51 opposite to the insulating sheet 4 side. Thereby, by forming the electrode member 5 with the conductive adhesive layer 51 and the metal layer 52, a part of the electrode member 5 can be easily used as a signal terminal.
In addition, the electrode member 5 may be provided with a resin layer 53 on the other surface side for the purpose of base material, protection, adhesion with other layers, and the like. For example, when the conductivity of the electrode member 5 is caused to function only by the conductive adhesive layer 51, it is preferable to provide the resin layer 53 as a base material. For example, the conductive adhesive layer 51 may be provided on both surfaces of the resin layer 53.
Further, the liquid detection sensor 1 can be formed also by the insulating sheet 4 and the electrode member 5 made of only the conductive adhesive layer 51.

(Overall configuration of liquid detection sensor)
A more specific configuration of the liquid detection sensor 1 will be described with reference to FIGS.
As shown in FIG. 2, the liquid detection sensor 1 according to the present embodiment has a structure in which an insulating sheet 4, two electrode members 5 (electrode members 5 a and 5 b), and an adhesive member 6 are sequentially stacked. ing. The liquid detection sensor 1 is fixed to the installation target such that the insulating sheet 4 side is in contact with the installation target. The liquid detection sensor 1 may be provided with a release sheet 3 having the same shape as the outer shape of the adhesive member 6.
The liquid detection sensor 1 is preferably sterilized for medical use. In particular, the liquid detection sensor 1 is preferably sterilized with ethylene oxide gas (EOG).

(Liquid detection sensor: insulation sheet 4)
The insulating sheet 4 has a rectangular outer shape that is similar to the outer shape of the liquid detection sensor 1 and smaller than the liquid detection sensor 1, and is disposed at the center of the liquid detection sensor 1. The liquid detection sensor 1 is not limited to a square shape in plan view, and may be a polygonal shape such as a triangular shape or a pentagonal shape, or may be an elliptical shape or a circular shape. The insulating sheet 4 may have a shape similar to such a liquid detection sensor 1 or may have a different shape.

The insulating sheet 4 has a structure that absorbs and retains liquid while exhibiting electrical conductivity due to the presence of the liquid. That is, the insulating sheet 4 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 sheet 4 is not limited to the material and shape as long as the liquid as the detection target is permeated. 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 sheet 4 is non-woven fabric or paper, even a small amount of liquid penetrates the insulating sheet 4 due to capillary action and changes from an insulating state to a conductive state. 1 can be used.

The material of the insulating sheet 4 is not particularly limited as long as it is a material having a large electric resistance when not in contact with a liquid.

Examples of the material of the insulating sheet 4 include cellulose such as cloth and paper, ceramic, and engineering plastic. Engineering plastics include polypropylene, cross-linked polyethylene, polyester, polybenzimidazole, aramid, polyimide, polyimideamide, polyetherimide, polyphenylene sulfide (PPS), polyethylene naphthalate (PEN), and the like.

Specifically, a non-woven fabric made of polyester resin or the like manufactured by Ozu Sangyo Co., Ltd., Asahi Kasei Fibers Co., Ltd., or Unitika Co., Ltd. can be used for the insulating sheet 4. This nonwoven fabric has hydrophilicity because the resin for adhering the polyester fibers is a water-soluble acrylic resin.

The thickness of the insulating sheet 4 is preferably 10 to 3000 μm. Moreover, it is preferable that the insulating sheet 4 has lyophilicity with respect to the liquid which is a detection target. For example, if the liquid is water, the lyophilic property is referred to as hydrophilic. With a configuration having lyophilicity, even a small amount of liquid penetrates into the insulating sheet 4 and changes from an insulating state to a conductive state, so even a small amount of liquid can be detected. It can be set as the liquid detection sensor 1 which shortens time.

The insulating sheet may be a material having a lyophilic property or having a lyophilic layer formed on the surface of a lyophobic material. For example, in the insulating sheet 4, a surfactant having surface activity with respect to the liquid may be attached to at least a part of the contact portion with the liquid in the liquid absorption / holding structure. In this case, the liquid detection sensor 1 that can select a 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 sheet 4 may have a coloring member whose color changes depending on the liquid. As a coloring member, the structure which sealed colorants, such as dye, in the capsule which melt | dissolves in the liquid which consists of solvents, such as water and oil, can be illustrated. In this case, when the capsule is melted by the liquid, the color of the insulating sheet 4 changes due to the flow of the sealed colorant. Therefore, the liquid detection sensor 1 can detect the liquid leakage visually. Can do.

Furthermore, the insulating sheet 4 may be attached with a dissolving material (inorganic salts: polysaccharides such as sodium chloride, sodium sulfate, calcium chloride, magnesium hydroxide, starch, etc.) that is ionized by being dissolved in a liquid. In this case, even if the liquid itself has no conductivity (such as oil), the dissolved material ionized by the liquid can change the insulating sheet 4 to be conductive.

(Liquid detection sensor: electrode member 5)
In this embodiment, as shown in FIG. 2, the liquid detection sensor 1 is provided with two electrode members 5 (electrode members 5a and 5b). Signal lines such as measuring devices are connected to the electrode members 5a and 5b, respectively. Thereby, it becomes possible to detect conduction between the two electrode members 5a and 5b due to the insulating sheet 4 exhibiting conductivity due to leakage or the like.

The electrode members 5a and 5b are arranged so that their longitudinal directions are parallel. The electrode members 5a and 5b are arranged with a predetermined interval so as to be electrically separated from each other. The predetermined interval means an interval that does not malfunction due to the humidity of the atmosphere in which the liquid detection sensor 1 is installed.

The electrode members 5a and 5b have adhesiveness on one side of the insulating sheet 4, and are provided in contact with one side of the insulating sheet 4 due to the adhesiveness. The electrode members 5a and 5b are bonded to the insulating sheet 4 in such a manner that one end thereof protrudes from the insulating sheet 4 respectively. That is, the tip portions of the electrode members 5 a and 5 b are located outside the insulating sheet 4. Thereby, since electrode member 5a * 5b is in the state exposed outside when installing the liquid detection sensor 1, the operation | work connected to signal lines, such as a measuring device, is simplified.

As shown in FIG. 3, the electrode members 5a and 5b have a configuration in which a protective layer 50, a conductive adhesive layer 51, and a metal layer 52 are sequentially laminated. As shown in FIG. 4, the conductive adhesive layer 51 and the metal layer 52 have the same outer shape and are laminated so as to be overlapped.
The protective layer 50 and the metal layer 52 are bonded to both surfaces of the conductive adhesive layer 51 by the adhesiveness of the conductive adhesive layer 51. The conductive adhesive layer 51 is preferably disposed on the entire surface of the metal layer 52 at least at a portion where the protective layer 50 is not laminated. Note that the conductive adhesive layer 51 may be disposed in a distributed manner at the portion where the protective layer 50 is laminated, or may be disposed on the entire joint surface between the protective layer 50 and the metal layer 52.

Thus, the protective layer 50 is laminated | stacked so that the one end part of electrode member 5a * 5b may be covered. That is, the electrode members 5a and 5b have a laminated structure, a portion made of the protective layer 50, the conductive adhesive layer 51, and the metal layer 52, and a portion made of the conductive adhesive layer 51 and the metal layer 52. have.
More specifically, as shown in FIG. 3, the electrode members 5 a and 5 b are formed by sequentially laminating a conductive adhesive layer 51 and a metal layer 52, and in one end region of the conductive adhesive layer 51. A protective layer 50 is laminated. The electrode members 5a and 5b are covered with the insulating sheet 4 at a portion where only the conductive adhesive layer 51 and the metal layer 52 are laminated, and at least a part of the portion where the protective layer 50 is laminated. Is covered. In addition, it is not limited to this, The location where the protective layer 50 is laminated | stacked may not be covered with the insulating sheet 4. FIG. In other words, the electrode members 5 a and 5 b may be laminated only at a place where the protective layer 50 is exposed from the insulating sheet 4.

Thus, in this embodiment, electrode member 5a * 5b is arrange | positioned so that a part of location laminated | stacked by the protective layer 50, the conductive adhesive layer 51, and the metal layer 52 may be exposed from the insulating sheet 4. FIG. Is done. In other words, the electrode members 5 a and 5 b are partially exposed from the insulating sheet 4 where the protective layer 50 is laminated. Thereby, when the electrode member 5 contacts the installation object, the protective layer 50 can prevent direct contact between the conductive adhesive layer 51 and the installation object. The protective layer 50 is preferably an insulating layer.

(Liquid detection sensor: electrode member 5: metal layer 52)
The metal layer 52 is provided on the most adhesive member 6 side of the electrode member 5. The metal layer 52 is a metal foil or a metal thin film.

The metal layer 52 is not limited to a metal foil obtained by rolling, a metal foil obtained by electrolysis (such as a special electrolytic copper foil), and a rectangular wire, but vacuum deposition, sputtering, CVD, MO (metal organic), plating, and printing. A metal thin film formed by, for example, may be used.
The lower limit of the thickness of the metal layer 52 is 0.05 μm, and the upper limit of the thickness is 200 μm. When the metal layer 52 is formed by sputtering or vapor deposition, a thickness of 0.05 to 1 μm is preferable. When the metal layer 52 is formed by the conductive ink printing method, a thickness of 2 to 200 μm is preferable. When the metal layer 52 is formed of a metal foil, the thickness is preferably 2 to 100 μm.

The metal layer 52 may be made of any material as long as it has conductivity, but is preferably a metal such as aluminum or copper. The metal material forming the metal layer 52 may be nickel, copper, silver, tin, gold, palladium, aluminum, chromium, titanium, zinc, or an alloy containing two or more thereof. Good.

Furthermore, the metal layer 52 is particularly preferably a metal foil or a flat wire. In this case, the electrical resistance is small and the detection time can be shortened.

(Liquid detection sensor: electrode member 5: conductive adhesive layer 51)
The conductive adhesive layer 51 is formed by being applied to the metal layer 52. The lower limit of the thickness of the conductive adhesive layer 51 is preferably 1 μm, and the upper limit of the thickness is preferably 1000 μm, but is not limited to this depending on the application.

The conductive adhesive layer 51 is a mixture containing conductive particles and an adhesive resin, and is an adhesive that can be bonded at room temperature or by heating. The conductive particles have an average particle diameter of 0.1 to 50 μm and are blended in an amount of 10 to 250 parts by weight with respect to 100 parts by weight of the adhesive resin. The shape of the conductive particles is not limited to a spherical shape, a needle shape, a fiber shape, a flake shape, a dendritic shape, or the like.

Examples of the adhesive resin included in the conductive adhesive layer 51 include thermoplastic resins such as polyethylene, polypropylene, polyester, polyamide, acrylic, and urethane that are bonded by heating and pressurization, phenolic, and epoxy. Adhesives such as thermosetting resins such as melamine-based, melamine-based, and alkyd-based. The adhesive resin contained in the conductive adhesive layer 51 includes pressure-sensitive adhesives such as acrylic resin, silicon resin, thermoplastic elastomer resin, rubber resin, and polyester resin that are bonded at room temperature and pressure. Can be mentioned. A conductive adhesive and a conductive pressure-sensitive adhesive are formed by mixing conductive particles with the adhesive and the pressure-sensitive adhesive, respectively. The adhesive or pressure-sensitive adhesive may be a single resin or a mixture of the resins.

The conductive particles contained in the conductive adhesive layer 51 are partly or entirely formed of a metal material. For example, conductive particles include copper powder, silver powder, nickel powder, silver coat copper powder (Ag coated Cu powder), gold coated copper powder, silver coated nickel powder (Ag coated Ni powder), and gold coated nickel powder. 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.

(Liquid detection sensor: electrode member 5: protective layer 50)
The protective layer 50 covers the electrode member 5 so that the conductive portion exposed from the insulating sheet 4 does not come into contact with the installation location of the liquid detection sensor 1. Moreover, you may cover with the protective layer 50 except the location pinched by the electrode member 5 by a clip electrode part. Further, by providing the overcoat resin layer such as the protective layer 50 in this way, it is possible to prevent the conduction failure of the electrode member 5 due to the insulating sheet 4 being stretched by an external force. Therefore, it is possible to avoid the formation of a non-conductive portion in each of the electrode members 5 and to prevent a decrease in the liquid detection range. The overcoat resin layer may be provided with a plurality of holes penetrating the resin layer. As a result, moisture is released together with air, so that malfunction due to moisture can be prevented. The protective layer 50 is bonded to the conductive adhesive layer 51 by the adhesiveness of the conductive adhesive layer 51.

The protective layer 50 may be formed of paper or non-woven fabric, or may be formed of an epoxy resin, a polyester resin, an acrylic resin, a phenol resin, a urethane resin, or a mixture thereof. The thickness of the protective layer 50 is 5 to 200 μm, but is not particularly limited and can be set as appropriate. Moreover, when the protective layer 50 is formed of a PET film, it is desirable that the surface of the PET film is subjected to a hydrophilic treatment. The hydrophilic treatment is a hydrophilic resin coat, corona treatment, plasma treatment, or the like. Moreover, the protective layer 50 can use what was mentioned as a material of the overcoat resin layer 1110 mentioned later.

(Liquid detection sensor: adhesive member 6)
The adhesive member 6 is formed so as to hold the insulating sheet 4 and the electrode member 5 and to cover the insulating sheet 4 and the electrode member 5. The adhesive member 6 has adhesiveness at the exposed portion. Therefore, the insulating sheet 4 and the electrode member 5 of the liquid detection sensor 1 can be easily attached to a desired location by the adhesive member 6.

Specifically, the adhesive member 6 of the liquid detection sensor 1 has a rectangular shape in plan view and is formed in a flat plate shape having a predetermined thickness. Here, the predetermined thickness refers to a thickness that allows the liquid detection sensor 1 to be bent or deformed along the shape of the installation target and to maintain a deformed state when the liquid detection sensor 1 is attached to the installation target. means.

The adhesive member 6 has a function of fixing at least a part of the insulating sheet 4 and the electrode member 5 to the installation target. The adhesive member 6 has an adhesive 61 and an adhesive film 62.

(Liquid detection sensor: adhesive member 6: adhesive 61)
As for the adhesive 61, the area | region in an outer peripheral part is affixed on installation object. Moreover, in the center part, electrode member 5a * 5b is affixed and the insulating sheet 4 which covers electrode member 5a * 5b is affixed on the circumference | surroundings. As the adhesive 61, acrylic, natural rubber, or synthetic rubber can be used.

(Liquid detection sensor: adhesive member 6: adhesive film 62)
The pressure-sensitive adhesive 61 is formed on one surface of the pressure-sensitive adhesive film 62. The adhesive film 62 serves as a base film for the adhesive 61 and is disposed on the surface of the liquid detection sensor 1 opposite to the insulating sheet 4. The adhesive film 62 is formed in a size larger than the insulating sheet 4 and the electrode members 5a and 5b. Thereby, the adhesive film 62 impacts the insulating sheet 4 and the electrode members 5a and 5b by holding the adhesive 61 and covering the insulating sheet 4 and the electrode members 5a and 5b in the installed liquid detection sensor 1. It is designed to protect against external forces caused by rubbing and rubbing.

Further, the adhesive film 62 may be formed of paper or non-woven fabric, or may be formed of an epoxy resin, a polyester resin, an acrylic resin, a phenol resin, a urethane resin, or a mixture thereof. . The thickness of the adhesive film 62 is 12 to 200 μm, but is not particularly limited and can be set as appropriate.

(Liquid detection sensor: release sheet 3)
The release sheet 3 makes it possible to maintain the adhesiveness of the adhesive 61 over a long period of time and to exhibit the adhesiveness to the installation target of the liquid detection sensor 1 only when necessary. Thereby, the portability of the liquid detection sensor 1 becomes excellent. Further, the release sheet 3 can protect the insulating sheet 4 and the electrode members 5a and 5b with the adhesive member 6 in a state before the liquid detection sensor 1 is installed.

(Manufacturing method of liquid detection sensor)
A method of manufacturing the liquid detection sensor 1 in the above configuration will be described.

First, a long adhesive film 62 having a width of several times or several tens of times that of the liquid detection sensor 1 is prepared in a rolled state. The adhesive film 62 is unwound and the adhesive 61 is applied to the entire upper surface (one surface) of the adhesive film 62. Next, the metal layer 52 (copper foil etc.) is adhere | attached on the resin layer 53 with an adhesive agent, a conductive adhesive agent is coated, and the sheet | seat of the electrode member 5 is produced. The electrode member 5 is formed into a pattern by arbitrarily punching this sheet with a Thomson blade, and the electrode member 5 is 3 mm wide × 2 pieces (interval 2 mm) × length direction. The electrode member 5 may be formed by patterning the conductive adhesive 51 by a screen printing method. And a pair of electrode member 5 (electrode member 5a * 5b) is mounted in the width direction and length direction of the film 62 for adhesion | attachment to which the adhesive 61 was apply | coated. As a result, a plurality of pairs of electrode members 5 are arranged in a matrix in the width direction and the length direction on the adhesive film 62.

Thereafter, the insulating sheet 4 cut out to a size larger than the region where the pair of electrode members 5 is arranged is placed so as to cover the pair of electrode members 5. Further, if necessary, the release sheet 3 having the same size as the adhesive film 62 is covered from above the adhesive film 62. The insulating sheet 4 and the electrode members 5a and 5b are fixed to the adhesive 61 on the adhesive film 62 by being pressed by a pressing device (not shown). Thereby, as the liquid detection sensor 1, the insulating sheet 4, the electrode members 5a and 5b, and the adhesive member 6 are integrated. In addition, the peeling sheet 3 is also integrated as needed. When an intermediate product sheet in which a plurality of liquid detection sensors 1 are arranged in a matrix is created in this way, the single liquid detection sensor 1 is created by cutting or punching the intermediate product sheet.

Moreover, although this embodiment demonstrated the case where the metal layer 52 (copper foil etc.) was adhere | attached on the resin layer 53 with an adhesive agent, and the sheet | seat of the electrode member 5 was produced by coating with a conductive adhesive, it is not limited to this. . In the following modification, a case where the electrode member is formed by transfer printing will be described.
In other words, the liquid detection sensors (liquid detection sensors 701 and 801) of the following modifications have conductivity and adhesiveness with insulating sheets (insulating sheets 704 and 804) that exhibit conductivity by the presence of liquid. And a plurality of electrode members (electrode members 705 and 805) which are provided in contact with one surface of the insulating sheet by transfer printing using the adhesive property and are electrically separated from each other.

First, a liquid detection sensor 701 in which two electrode members 705 formed of a conductive adhesive layer 751 are provided in contact with one surface of an insulating sheet 704 by transfer printing will be described with reference to FIG.
The two electrode members 705 are composed of a conductive adhesive layer 751 including an adhesive and conductive particles. The adhesive contained in the conductive adhesive layer 751 is preferably a polyester-based thermoplastic resin, but is not limited thereto, and can be appropriately selected from various resins having a glass transition temperature (Tg) of −30 ° C. to 5 ° C. is there. For example, urethane resins, acrylic resins, polyamide resins, polyolefin resins, polyester resins, etc. are used as thermoplastic resins, and epoxy resins, phenol resins, melamine resins, alkyd resins are used as thermosetting resins. Examples thereof include resins.
The conductive particles 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 powder. Yes, 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 can also be used. The conductive particles preferably have an average particle size of 5 to 30 μm. Further, the conductive adhesive (printing ink) constituting the conductive adhesive layer 751 is preferably formed by mixing 50 to 100 parts by weight of conductive particles with 100 parts by weight of the thermoplastic resin.

As shown in FIG. 11, the two electrode members 705 (conductive adhesive layer 751) are thermally transferred to the insulating sheet 704 by transfer printing. Specifically, first, a PET film 770 coated with a non-silicone release agent 771 is screen-printed with a conductive adhesive (printing ink) obtained by mixing a thermoplastic resin and conductive particles. An adhesive layer 751 is formed. That is, a transfer film 772 in which a conductive adhesive layer 751, a non-silicon release agent 771, and a PET film 770 are sequentially laminated is formed (see FIG. 11A).
The release agent is not limited to this, and may be silicon. The layer thickness of the PET film 770 is preferably in the range of 6 μm to 150 μm.
In screen printing, it is preferable to use a polyester plate-making mesh for the printing plate. The plate making mesh is preferably 50 mesh (number of meshes per inch) to 350 mesh. Further, the printing plate is preferably made to have an emulsion thickness of 5 μm to 100 μm. The conductive adhesive layer 751 is preferably printed with a layer thickness in the range of 10 μm to 50 μm.
The method for printing the conductive adhesive layer 751 on the PET film 770 is not limited to screen printing, and rotary screen printing, gravure printing, flexographic printing, die coating printing, and the like can be used.

Then, as shown in FIG. 11B, transfer printing is performed by pressurizing and heating the insulating sheet 704 using the transfer film 772, and the conductive adhesive layer 751 is transferred to the insulating sheet 704. The Specifically, although not shown, the transfer film 772 and the insulating sheet 704 are set on two heated feed rolls, respectively. The transfer film 772 and the insulating sheet 704 are fed while being pressed by two feeding rolls while being heated by the feeding roll. This enables continuous transfer printing processing of the transfer film 772 and the insulating sheet 704 (continuous hot roll pressure transfer method). After that, as shown in FIG. 11C, the non-silicon release agent 771 and the PET film 770 are peeled off to form the liquid detection sensor 701.
In such a continuous hot roll pressure transfer method, the heating temperature by the feeding roll is preferably 110 to 140 ° C., more preferably 120 to 130 ° C. The pressing force is preferably 1 N / cm 2 to 50 N / cm 2, and it is preferable to spend some pressing time. Specifically, the pressurizing time by the feeding roll is preferably 0.5 to 60 seconds, more preferably 1 to 15 seconds. Transfer printing is not limited to the continuous hot roll pressurizing transfer method. For example, a single wafer heat pressure transfer method in which a transfer film 772 and an insulating sheet 704 cut in advance to a predetermined size are pressed and heated by a press machine may be used. In this case, the heating temperature by the press is preferably 80 to 150 ° C, more preferably 120 to 140 ° C. Further, it is preferable that the pressing force by the press is 1 N / cm 2 to 50 N / cm 2 and the pressurizing time is 1 second to 10 minutes.

Next, with reference to FIG. 12, the liquid detection sensor 801 in which the two electrode members 805 have a conductive pressure-sensitive adhesive containing a pressure-sensitive adhesive and have conductivity and adhesiveness will be described. In this modification, the two electrode members 805 are configured by a conductive adhesive layer 851 including an adhesive and conductive particles. Examples of the pressure-sensitive adhesive include acrylic resins, silicon resins, rubber resins, and polyester resins. Specific examples include KP-1581, KP-1104, KP-2074, and SZ-6153 manufactured by Nippon Carbide, and AR-2172-M3 manufactured by Big Technos. In addition, about the structure similar to the liquid detection sensor 701, description may be abbreviate | omitted using the same member name.

As shown in FIG. 12, the two electrode members 805 (conductive adhesive layer 851) are thermally transferred to the insulating sheet 804 by transfer printing. Specifically, first, a conductive adhesive (printing ink) in which an adhesive and conductive particles are mixed is screen-printed on a PET film 870 coated with a non-silicone release agent 871 to conduct conductive adhesion. An agent layer 851 is formed. That is, a transfer film 872 in which a conductive adhesive layer 851, a non-silicon release agent 871, and a PET film 870 are sequentially laminated is formed (see FIG. 12A).

Then, as shown in FIG. 12B, transfer printing is performed by applying pressure to the insulating sheet 804 at room temperature using the transfer film 872, and the conductive adhesive layer 851 is transferred to the insulating sheet 804. . Specifically, the transfer film 872 and the insulating sheet 804 are set on two feeding rolls (non-heated), respectively. The transfer film 872 and the insulating sheet 804 are fed while being pressed between two feeding rolls. This enables continuous transfer printing processing between the transfer film 872 and the insulating sheet 804. Thereafter, as shown in FIG. 12 (c), the non-silicon release agent 871 and the PET film 870 are peeled off to form a liquid detection sensor 801.
In such a pressure transfer method, it is preferable to spend a pressurizing time in the range of 0.5 to 60 seconds on all the parts to be pressed. Moreover, transfer printing is not limited to the continuous hot roll pressure transfer method. For example, a single-wafer pressure transfer method in which the transfer film 872 and the insulating sheet 804 cut in advance to a predetermined size are pressed by a press machine may be used. In this case, the pressurizing time by the press is preferably 1 second to 10 minutes.

Further, when the electrode member is exposed from an insulating sheet or other structure and visible from the outside like the liquid detection sensor 601 in FIG. 10, a clip or the like is used so that the exposed electrode member cannot be seen. A cover member such as a non-woven fabric may be provided except for the connecting portion. Specifically, as shown in FIG. 13, in the liquid detection sensor 901, the electrode member 905 is exposed from the insulating sheet 904, but the cover member 907 is provided on the surface of the electrode member 905 opposite to the insulating sheet 904. It has been. Accordingly, even when the surface on the insulating sheet 904 side is attached to a person's arm or the like, it is possible to prevent the electrode member 905 from being exposed and not to touch the skin.

Further, as shown in FIG. 14 (plan view), an electrode member 1005 arranged to face the insulating sheet 1004 has a plurality of convex portions 1005a on the opposite side and is formed by two electrode members 1005. The liquid detection sensor 1001 may have a shape in which the gap is bent. Thereby, the detection area of a leak can be increased and the speed of a leak detection can be improved.

Further, as shown in FIG. 15, a conductive ink (conductive paste) may be used for the electrode member. Specifically, the liquid detection sensor 1101 in FIG. 15 includes an insulating sheet 1104 and a plurality of electrode members 1105 (electrode members 1105a and 1105b). The electrode members 1105a and 1105b are conductive ink (conductive paste). The electrode members 1105a and 1105b are formed by being applied or printed on one surface of the insulating sheet 1104 in a separated state.

The electrode members 1105a and 1105b are provided in parallel on the insulating sheet 1104, and each extend from one end of the insulating sheet 1104 to the other opposite end. Therefore, as shown in the lower part of FIG. 15, the liquid detection sensor 1101 can be formed simply by forming it in a long shape and cutting it into a predetermined size, thereby improving productivity and reducing costs. Is possible. In addition, it is possible to cut the shape into a desired size and use it, thereby improving the convenience.

Note that an overcoat resin layer 1110 may be provided on one surface of the liquid detection sensor 1101 where the electrode members 1105a and 1105b are provided. The overcoat resin layer 1110 is laminated with resin so as to cover the entire surface of the liquid detection sensor 1101 except for the insulating sheet 1104 at one end and the electrode members 1105a and 1105b sandwiched by the clip on one side of the liquid detection sensor 1101. Has been formed. Accordingly, it is possible to prevent the conduction failure of the electrode members 1105a and 1105b due to the insulating sheet 1104 extending by an external force. Therefore, it is possible to avoid the formation of a non-conductive portion in each of the electrode members 1105a and 1105b, and to prevent a decrease in the liquid detection range. The overcoat resin layer may be provided with a plurality of holes penetrating the resin layer. As a result, moisture is released together with air, so that malfunction due to moisture can be prevented. Accordingly, the “one end portion sandwiched between the clips” is not limited to only the portion sandwiched between the clips. For example, an aspect in which at least a part of each of the plurality of electrode members is exposed from the overcoat resin layer may be employed. That is, it is only necessary that each of the plurality of electrode members be connectable to the measuring apparatus.

The conductive ink used for the electrode member 1105 is a metal-based powder (metal powder, metal compound (sulfide, chloride, etc. of various metals) that is conductive particles against a thermosetting resin or thermoplastic resin dissolved in a solvent. ) Or carbon powder. As a material for the thermosetting resin, epoxy, alkyd, and the like are preferable. As a material of the thermoplastic resin, polyester, polyurethane, acrylic, vinyl chloride, or the like is preferable. Among the thermosetting resins, epoxy is more preferable. Of the thermoplastic resins, polyester, polyurethane and acrylic are more preferable, and polyester and polyurethane are more preferable. The conductive particles are preferably silver powder. As for the ratio of the silver powder in the conductive ink, the lower limit is preferably 10 parts by mass and the upper limit is preferably 85 parts by mass with respect to 35 parts by mass of the thermosetting resin or the thermoplastic resin. Further, the ratio of the solvent in the conductive ink is appropriately selected according to the printing method, the type of conductive particles, the thickness of the conductive ink, etc., with respect to the target resistance value.
As an example, in order to change the resistance value of an electrode member from 100Ω to 300Ω, screen printing is performed on a base material containing 35 parts by mass of polyester, 65 parts by mass of silver powder, and 65 parts by mass of butyl carbitol acetate, and this is an insulating sheet. Heat transfer to. The thickness of the thermally transferred electrode member is 20 μm after drying.

In addition, the conductive particles used for the conductive ink may be scale-like (flakes), circular (oval, egg-shaped, etc., as long as the corners are rounded), dendrite shape, needle shape, chain shape, A spike shape or the like can be used, but a scale shape is preferable. This is because the conductive particles are scaly, so that the conduction of the electrode member 1105 itself can be maintained even when the electrode member 1105 is deformed due to the elongation of the insulating sheet 1104 or the like.

The overcoat resin layer 1110 is made of a thermosetting resin or a thermoplastic resin dissolved in a solvent. The overcoat resin layer 1110 is preferably made of epoxy, alkyd, or the like as a thermosetting resin material. As a material of the thermoplastic resin, polyester, polyurethane, acrylic, vinyl chloride, or the like is preferable. When the resin layer 1110 is colored, for example, when it is white, white pigments such as zinc white (zinc oxide) and titanium white (titanium oxide) may be mixed. Moreover, you may mix | blend an antiblocking agent etc. suitably. Among the thermosetting resins, epoxy is more preferable. Of the thermoplastic resins, polyester, polyurethane and acrylic are more preferable, and polyester and polyurethane are more preferable. As for the ratio of the titanium oxide in overcoat resin, it is preferable that a minimum is 15 mass parts and an upper limit is 30 mass parts with respect to 35 mass parts of thermoplastic resins. Further, the ratio of the blocking agent in the overcoat resin is preferably 3 parts by mass with respect to 35 parts by mass of the thermoplastic resin, and preferably 10 parts by mass with respect to the upper limit. Moreover, it is preferable that the minimum of a ratio of the solvent in overcoat resin is 5 mass parts with respect to 35 mass parts of thermoplastic resins, and an upper limit is 30 mass parts.

(Application example of liquid detection sensor)
The sheet-like liquid detection sensor 1 manufactured as described above is put together in a stacked state in which a plurality of sheets are batched. And these liquid detection sensors 1 are stored in storage means, such as a worker's pocket and a tool case. That is, the liquid detection sensor 1 can be stored while being carried by an operator like a bandage with gauze.

As shown in FIG. 5, when there is an installation target 2 of a device or a place where it is desired to detect the presence or absence of liquid leakage, first, if the liquid detection sensor 1 includes the release sheet 3, the release sheet 3 is peeled off If the liquid detection sensor 1 does not include the sheet 3, it is prepared as it is.

Next, the electrode members 5 a and 5 b are pulled up from the surface of the adhesive member 6 where the adhesive 61 is formed, and are sandwiched between the clips 11 attached to the end of the signal line 10 of the measuring device 7. The electrode members 5a and 5b are connected to either the input terminal or the output terminal of the measuring device 7. Then, the liquid detection sensor 1 is moved so that the formation surface of the adhesive 61 in the adhesive member 6 contacts the installation target 2, and the liquid detection sensor 1 is pressed against the installation target 2. Thereby, the liquid detection sensor 1 is adhered in a state in which the insulating sheet 4 is in contact with a desired portion of the installation target 2. As a result, even when the installation target 2 moves or vibrates, the liquid detection sensor 1 continues to detect liquid leakage for a long period without causing a positional shift.

When liquid leakage occurs in the installation object 2, the insulating sheet 4 exhibits conductivity when the liquid penetrates. As a result, the electrode members 5 a and 5 b that are electrically separated from each other are electrically connected via the insulating sheet 4. As a result, the measuring device 7 detects a change in electrical resistance, so that the liquid leakage is detected.

After this, the liquid detection sensor 1 that has detected the liquid is peeled off from the installation target 2 by the operator and replaced with an unused liquid detection sensor 1. In this manner, the liquid detection sensor 1 can be used in a disposable use form such as a bandage with gauze. Note that the used liquid detection sensor 1 may be reused by drying the soaked liquid.

In addition, as shown in FIG. 5, when the liquid detection sensor 1 is applied to medical treatment, the installation target 2 is exemplified by a human arm or a leg. In this case, the indwelling needle 12 may come off during treatment such as dialysis, blood transfusion, infusion, etc., and blood / drug solution may leak. However, if the liquid detection sensor 1 is attached to the puncture portion, the blood / drug solution Leakage can be detected. At this time, since the liquid detection sensor 1 is directly attached to the puncture portion, even a small amount of liquid leakage can be detected.

(Modification)
As mentioned above, although the liquid detection sensor 1 of this embodiment was demonstrated, it is not limited to this.
For example, as shown in FIG. 6, the liquid detection sensor may have a configuration in which the electrode member is formed of a conductive adhesive. Specifically, the liquid detection sensor 101 shown in FIG. 6 includes an insulating sheet 104, two electrode members 105 and 105, and an adhesive member 106. The electrode members 105 and 105 are laminated on the insulating sheet 104 by printing or applying a conductive adhesive layer. The adhesive member 106 has a configuration in which an adhesive 161 and an adhesive film 162 are laminated. The insulating sheet 104 is attached in a state where the side on which the electrode members 105 and 105 are laminated protrudes partly from the adhesive member 106 to the adhesive 161 side of the adhesive member 106. As a result, the liquid detection sensor 101 can be clamped by a clip or the like attached to the end of the signal line, and the electrode members 105 and 105 are electrically connected to the signal line. The liquid detection sensor 101 may be provided with a release sheet 103 having the same shape as the outer shape of the adhesive member 106.

For example, as shown in FIG. 7, the liquid detection sensor may have a simple configuration in which the metal layer is not included in the electrode member. Specifically, the liquid detection sensor 201 illustrated in FIG. 7 includes an insulating sheet 204, two electrode members 205 and 205, and an adhesive member 206. The electrode members 205 and 205 have a configuration in which a protective layer 250 is laminated on the tip of the conductive adhesive layer 251. In the electrode members 205 and 205, a part of the tip end region where the protective layer 250 is laminated is exposed from the insulating sheet 204. That is, the portion where the conductive adhesive layer 251 is exposed from the insulating sheet 204 is protected by the protective layer 250. The adhesive member 206 has a configuration in which an adhesive 261 and an adhesive film 262 are laminated. The liquid detection sensor 201 may be provided with a release sheet 203 having the same shape as the outer shape of the adhesive member 206.

Thus, the liquid detection sensor 201 has a configuration in which the electrode member 205 does not include a metal layer. That is, the liquid detection sensor 201 is easier to bend or deform along the shape of the installation target than the configuration in which the electrode member includes a metal layer. Therefore, the liquid detection sensor 201 is easy to apply to the shape of the installation target and is difficult to peel from the installation target. Further, since the electrode member is only the conductive adhesive layer, the manufacture is simple by printing, coating, transfer, and the like.

Further, as shown in FIG. 8, the liquid detection sensor may have a configuration in which the electrode member includes a resin layer. Specifically, the liquid detection sensor 301 shown in FIG. 8 includes an insulating sheet 304, two electrode members 305 and 305, and an adhesive member 306. The electrode members 305 and 305 have a structure in which a resin layer 353, a metal layer 352, a conductive adhesive layer 351, and a protective layer 350 are laminated. The electrode members 305 and 305 are partially exposed from the insulating sheet 304 at the tip end region where the protective layer 350 is laminated. That is, the portion where the conductive adhesive layer 351 is exposed from the insulating sheet 304 is protected by the protective layer 350. The resin layer 353 is laminated in a region opposite to the side where the protective layer 350 is laminated. That is, the resin layer 353 is not laminated at the tip portion of the electrode member 305 on the side where the protective layer 350 is laminated. The adhesive member 306 has a configuration in which an adhesive 361 and an adhesive film 362 are laminated. The liquid detection sensor 301 may be provided with a release sheet 303 having the same shape as the outer shape of the adhesive member 306.

As described above, the liquid detection sensor 301 has a configuration in which the conductive adhesive layer 351 is protected by the protective layer 350 and the resin layer 353 is not laminated at the tip of the electrode member 305 exposed from the insulating sheet 304. Yes. When the measuring device 7 is connected to the liquid detection sensor 301, the tip of the electrode member 305 may be sandwiched with a clip or the like attached to the end of the signal line of the measuring device 7, which facilitates connection.

Further, as shown in FIG. 9, the liquid detection sensor has a configuration in which a through-hole is formed in the adhesive member, and the tip of the electrode member is inserted into the through-hole and protrudes to the opposite surface. May be. Specifically, the liquid detection sensor 401 illustrated in FIG. 9 includes an insulating sheet 404, two electrode members 405 and 405, and an adhesive member 406. The electrode members 405 and 405 have a structure in which a metal layer 452 and a conductive adhesive layer 451 are laminated. Note that the conductive adhesive layer 451 is not laminated on the tip portions of the electrode members 405 and 405. The adhesive member 406 has a configuration in which an adhesive 461 and an adhesive film 462 are laminated, and through holes 463 and 463 penetrating the adhesive 461 and the adhesive film 462 are formed. The liquid detection sensor 401 may be provided with a release sheet 403 having the same shape as the outer shape of the adhesive member 206.

The metal layer 452 includes an adhesive portion 452a and a lead portion 452b. The bonding portion 452 a is a portion where the conductive adhesive layer 451 of the metal layer 452 is laminated, and is bonded to the pressure-sensitive adhesive 461 of the pressure-sensitive adhesive member 406. The lead portions 452b of the electrode members 405 and 405 extend from the bonding portions 452a, and are inserted into the two through holes 463 and 463 formed in the adhesive member 406 from the connection portions with the bonding portions 452a, respectively, on the opposite side. It is supposed to be located on the surface. The adhesive portions 452 a of the electrode members 405 and 405 are held by the viscosity of the adhesive member 406 and are entirely covered with the insulating sheet 404. In other words, the adhesive member 406 is formed in a sheet shape having a through-hole 463, and the electrode members 405 and 405 each hold the adhesive portions 452 a on one side of the adhesive member 406, and each drawer The part 452b is configured to be positioned on the other surface side through the through holes 463 and 463.

In this manner, after attaching one surface side of the adhesive member 406 in the liquid detection sensor 401 to a desired location in a contact state, the respective lead portions 452b which are the end portions of the electrode members 405 and 405 located on the other surface side are signaled. Since the liquid detection sensor 401 can be used as a terminal, a series of setting operations from attachment to detection can be performed easily and in a short time.

Further, as shown in FIG. 10, the liquid detection sensor may be configured such that the tip of the electrode member is located outside the adhesive member. Specifically, the liquid detection sensor 601 illustrated in FIG. 10 includes an insulating sheet 604, two electrode members 605 and 605, and an adhesive member 606. The electrode members 605 and 605 are configured such that a metal layer 652 and a conductive adhesive layer 651 are stacked, and a protective layer 650 is stacked only at the tip. In addition, you may be covered with the protective layer except the location electrically connected with the terminal of a clip when pinched | interposed with a clip. For example, in FIG. 10, the electrode member 605 in a range protruding outward from the adhesive member 606 is sandwiched by clips. In this case, a part of the surface on the metal layer 652 side of the electrode member 605 is electrically connected to the terminal of the clip. Accordingly, a portion of the metal layer 652 that is bonded to the adhesive 661 may be covered with a protective layer.
A part of the distal end portion of the electrode member 605 is exposed from the insulating sheet 604, and the distal end reaches the outside of the adhesive member 606. The adhesive member 606 has a configuration in which an adhesive 661 and an adhesive film 662 are laminated. The liquid detection sensor 601 may be provided with a release sheet 603 having the same shape as the outer shape of the adhesive member 606.

As described above, the liquid detection sensor 601 has a configuration in which the tips of the electrode members 605 and 605 are positioned outside the adhesive member 606. Therefore, the electrode members 605 and 605 that protrude from the outside of the adhesive member 606 can be used as signal terminals after the one surface side of the adhesive member 606 in the liquid detection sensor 601 is attached to a desired location in contact. As 601, a series of setting operations from attachment to detection can be performed easily and in a short time.

In the present embodiment, the configuration in which the liquid detection sensor has two electrode members has been described, but the present invention is not limited to this. For example, a configuration in which three or more electrode members are provided may be used. When a plurality of electrode members are provided, a plurality of electrode members may be connected to the input / output terminals of the measuring device. Further, the shape of the electrode member is not limited to a quadrangular shape, and may be a polygonal shape such as a triangular shape or a pentagonal shape, an elliptical shape or a circular shape, or a linear shape. May be.

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.

In addition, 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 Installation object 3 Release sheet 4 Insulation sheet 5 Electrode member 6 Adhesive member 7 Measuring device 50 Protective layer 51 Conductive adhesive layer 52 Metal layer 53 Resin layer 61 Adhesive 62 Adhesive film

Claims (9)

An insulating sheet that exhibits electrical conductivity through the presence of liquid;
A liquid detection device comprising: a plurality of electrode members that are electrically conductive and adhesive, are provided in contact with one surface of the insulating sheet by the adhesive property, and are electrically separated from each other. sensor. The electrode member is
The liquid detection sensor according to claim 1, further comprising a conductive adhesive layer bonded to one surface of the insulating sheet. The liquid detection sensor according to claim 2, wherein the conductive adhesive layer is formed by printing or applying a conductive adhesive on the insulating sheet. 3. The liquid detection sensor according to claim 2, wherein the conductive adhesive layer is provided in contact with one surface of the insulating sheet by transfer printing. The electrode member further includes:
The liquid detection sensor according to claim 2, further comprising a metal layer laminated on a surface opposite to the insulating sheet side in the conductive adhesive layer. The liquid detection sensor according to claim 2, wherein the conductive adhesive layer has the conductivity and adhesiveness by including a conductive pressure-sensitive adhesive containing a pressure-sensitive adhesive. . The liquid detection sensor according to any one of claims 1 to 6, wherein the electrode member and the insulating sheet are provided with an overcoat resin layer except for one end portion sandwiched between clips. The electrode member further includes:
The liquid detection sensor according to claim 1, further comprising a protective layer laminated on a surface exposed from the insulating sheet. Furthermore, while holding the said insulation sheet and the said electrode member, it is formed so that these insulation sheets and an electrode member may be covered, and it has the adhesion member which has adhesiveness at least on the exposed surface, The 1st thru | or 8 characterized by the above-mentioned. The liquid detection sensor according to any one of the above.

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