JP6926500B2 - Clothes-type electronic equipment - Google Patents

Description

The present invention relates to a garment-type wearable electronic device used by incorporating an electronic function or an electric function into a garment, and more particularly to a garment-type electronic device having elastic electric wiring and having a natural wearing feeling.
Furthermore, the present invention relates to a garment-type electronic device worn during sports in which athletes or athletes and exercise equipment may collide violently with each other.

Recently, wearable electronic devices have been developed that are intended to be used in a state where electronic devices having input / output, calculation, and communication functions are used in a state of being extremely close to or in close contact with the body. As wearable electronic devices, devices having an accessory-type outer shape such as wristwatches, glasses, and earphones, and textile-integrated devices incorporating electronic functions in clothes are known. An example of such a textile integrated device is disclosed in Patent Document 1.

Electronic devices require electrical wiring for power supply and signal transmission. In particular, textile-integrated wearable electronic devices are required to have elasticity in their electrical wiring in accordance with their stretchable clothing. Normally, electrical wiring made of metal wire or metal foil does not have practical elasticity in nature, so the metal wire or metal foil is arranged in a wavy or repeated horseshoe shape to give it a pseudo expansion and contraction function. The method is used.
In the case of a metal wire, the metal wire can be regarded as an embroidery thread and sewn on clothes to form wiring. However, it is self-evident that such a method is not suitable for mass production.
The method of forming wiring by etching a metal foil is a general method for manufacturing a printed wiring board. A method is known in which a metal foil is attached to an elastic resin sheet and corrugated wiring is formed by a method similar to that of a printed wiring board to form a pseudo elastic wiring. (Refer to Non-Patent Document 1) Such a method is to give a pseudo expansion / contraction characteristic by twisting deformation of the corrugated wiring part, but since the metal foil also changes in the thickness direction due to twisting deformation, it can be used as a part of clothes. When it was used, it gave a very uncomfortable feeling of wearing, which was not preferable. Further, when the metal foil is subjected to excessive deformation such as during washing, permanent plastic deformation occurs in the metal foil, and there is a problem in the durability of the wiring.

As a method for realizing elastic conductor wiring, a method using a special conductive paste has been proposed. Conductive particles such as silver particles, carbon particles, and carbon nanotubes are kneaded with an elastomer such as a urethane resin having elasticity, natural rubber, synthetic rubber, a solvent, etc. to form a paste, which is directly applied to clothes or an elastic film base. The wiring is printed and drawn in combination with materials.
A conductive composition composed of conductive particles and a stretchable binder resin can realize a conductor that can be stretched macroscopically. Microscopically, the conductive composition obtained from such a paste deforms the resin binder portion when it receives an external force, and the conductivity is maintained within a range in which the electrical chain of the conductive particles is not interrupted. be. The resistivity observed macroscopically is higher than that of metal wire or metal foil, but since the composition itself has elasticity, it is not necessary to take a shape such as corrugated wiring, and the wiring width and thickness. Since the degree of freedom is high, it is practically possible to realize wiring with lower resistivity than metal wire.

Patent Document 2 discloses a technique of suppressing a decrease in conductivity during elongation by combining silver particles and silicone rubber and further coating a conductive film on a silicone rubber substrate with silicone rubber. Patent Document 3 discloses a combination of silver particles and a polyurethane emulsion, and it is said that a conductive film having high conductivity and high elongation can be obtained. Furthermore, many examples have been proposed in which attempts are made to improve the characteristics by combining conductive particles having a high aspect ratio such as carbon nanotubes and silver fillers.

Patent Document 4 discloses a technique for directly forming electrical wiring on clothes by using a printing method.

Japanese Unexamined Patent Publication No. 2-234901 JP-A-2007-173226 Japanese Unexamined Patent Publication No. 2012-54192 Japanese Patent No. 3723565

As can be easily inferred from printed wiring in a general printed wiring board or membrane circuit, electrical wiring requires an insulating substrate or base layer, a patterned conductor layer, and an insulating cover coat layer. Further, in wearable electronic devices, especially in wiring used for measuring human body potential by attaching to the human body, an electrode that directly contacts the surface of the human body may be required, and the electrode surface is printed wiring. According to the example of the plate or membrane circuit, it is common technical knowledge that an electrode surface layer is provided, which is plated with precious metal, tin, solder, etc., or the conductor layer is coated with carbon paste or the like using carbon as a conductive filler. be.

The base layer, the conductor layer, the elastic insulating coating layer, and the electrode surface layer each have a unique pattern shape, and each layer has a thickness necessary for exhibiting each function. As a result of the overlapping of the layers, the surface of the printed wiring becomes uneven. This is the same whether it is a printed wiring board that mainly forms a pattern by the subtractive method or a membrane circuit that forms a pattern by the additive method.

FIG. 1 is a schematic view showing a cross section of a conventional printed wiring. 1. 1. On the base material, 2. Underlayer, 3. Conductor layer, 4. Wiring having the cross-sectional structure shown here can be obtained by repeating printing and drying and curing in the order of the insulating coat layer. There is no insulating cover coat here, and the portion where the conductor layer is exposed is the electrode portion, and the portion covered with the insulating cover coat is the wiring portion.
FIG. 2 is a schematic view when an electrode surface layer is provided in the conventional printed wiring. In either case, it can be understood that a step is generated at the boundary between the wiring portion and the electrode portion, and the surface of the electrical wiring becomes uneven.

The unevenness of the surface of the printed wiring does not pose a big problem in general electronic devices, but in clothes-type wearable electronic devices, especially in wiring formed inside clothes and in direct contact with the surface of the human body, clothes. It may cause discomfort and discomfort when worn, and may hinder the natural feeling of wearing.
Of course, the hindrance to the natural wearing feeling due to the unevenness of the wiring surface is the same in the elastic wiring using metal wiring and the wiring using conductive fibers.

In a textile integrated device in which an electronic function is incorporated in a garment, the electrode, wiring, and a device (in the present invention, which are responsible for a sensor function, a calculation function, a storage function, a communication function, etc.) provided in the garment are mainly composed of conventional electronic technology. The part is called a device for convenience) and is connected by a connector.
Now, suppose a scene in which such a clothing-type electronic device is worn and exercise is performed. In martial arts such as boxing, karate, and taekwondo, or in ball games such as rugby, American football, handball, soccer, basketball, volleyball, tennis, baseball, softball, and cricket table tennis, athletes or athletes and exercise equipment (mainly balls) ) And violently collide with each other. Therefore, assuming such an application, the position where the device is arranged becomes a problem.

In rugby, American football, etc., a method of supporting each player with a GPS (Global Positioning System / Global Positioning System) terminal has been established in order to record the movements of athletes during competition. The GPS terminal is generally placed in the back of the neck. It is easy to infer that such electronic devices should be placed on the back of the body, mainly in competitions where they collide head-on. Therefore, even in a clothing-type electronic device for collecting biological information during exercise, it is desirable that the device is arranged at the back neck, and the connector for connecting to the device is also preferably located at the back neck.

However, assuming that it is worn during such strenuous exercise, it is not easy to electrically connect the electrodes arranged in each part of the body and the connectors arranged in the back neck. That is, such athletic clothing is constantly exposed to stress such as strong compression due to hitting during competition or large stretching applied by being forcibly pulled by another athlete, and is further wetted by sweating during competition and rainy weather. It is not uncommon to be in a state. It is possible to reinforce the wiring, electrodes, or device mounts, including connectors, but such reinforced garment-type electronic devices are heavy, as if they were wetsuits or armor. It is not possible to satisfy the original function of sportswear that can be worn during intense exercise due to the heat.

As a result of diligent studies to achieve such an object, the present inventor devises the wiring material and the insulating material to be used, and the shape thereof, so that the biological information can be measured comfortably and stably even during strenuous exercise. The following inventions have been reached as possible clothing-type electronic devices.
In addition, we found that the main cause of the discomfort felt when wearing was the step at the boundary between the electrode surface where the conductor layer or electrode surface layer is exposed and the wiring part covered with the elastic insulation coating layer. The invention has been reached.
That is, the present invention has the following configuration.

[1] In clothing-type electronic devices used for measuring biological information, at least
a. With multiple electrodes that come into direct contact with the body surface,
b. A connector for connecting to an electronic device having a body potential data measurement function and at least a data storage function or a communication function,
c. Electrical wiring for electrically connecting the electrode and the connector,
A garment-type electronic device characterized in that the connector is provided in the central portion of the back neck of the garment, and the breaking elongation of the electrical wiring is 40% or more.
[2] The clothing-type electronic device according to [1], wherein the electrode that comes into direct contact with the body surface is made of an elastic conductor layer having a breaking elongation of 40% or more.
[3] The electrode in direct contact with the body surface is composed of an elastic conductor layer having a breaking elongation of 50% or more, and the thickness of the elastic conductor layer is 300 μm or less [1] or [1]. 2] The clothing type electronic device according to.
[4] Any of [1] to [3], wherein the electrical wiring is made of an elastic conductor layer having a breaking elongation of 50% or more, and the thickness of the elastic conductor layer is 300 μm or less. The garment-type electronic device described.
[5] The electrical wiring is made of an elastic wire having a breaking elongation of 50% or more, and the thickness of the elastic wire including an insulating coating is 2.4 mm or less [1] to [3]. A garment-type electronic device described in any of the above.
[6] The biological information is a time change of the electrocardiographic potential, and there are a pair of left and right electrodes that come into direct contact with the body surface, and they are arranged symmetrically with the center line of the back of a portion corresponding to the back of the human body. The garment-type electronic device according to any one of [1] to [5].
[7] The clothing-type electronic device according to any one of [1] to [6], which is characterized in that it is worn in a sport in which the wearer is hit.
[8] It is characterized by having a stretchable insulating coating layer having a breaking elongation of 80% or more, an effective thickness of 25 μm or more, and a volume resistivity of 1 GΩ · cm or more [1] to [7]. A garment-type electronic device described in any of the above.
[9] The clothing type electronic device according to any one of [1] to [8], wherein the resistance value between the electrodes is 1 GΩ or more.
[10] The clothing-type electronic device according to any one of [1] to [9], wherein the resistance value between the electrodes when wet is 1 MΩ or more.

Furthermore, it is preferable that the present invention has the following configuration.
[11] A garment-type electronic device having an electrical wiring including a conductor layer, an elastic insulating coating layer, and an insulating base layer in a portion in contact with the body surface, and a step at the boundary between the electrode portion and the wiring portion of the electrical wiring is substantially present. The garment-type electronic device according to any one of [1] to [10], characterized in that there is no such thing.
[12] A garment-type electronic device having the electrical wiring according to the above [11], which has an electrical wiring including a conductor layer, an elastic insulating coating layer, an insulating base layer, and an electrode surface layer.
[13] It is characterized in that the conductive function of the conductor layer and the insulating function of the stretchable insulating coating layer and the insulating base layer can be deformed to an elongation rate of 10% or more without substantially impairing [11]. Alternatively, the clothing-type electronic device according to any one of [12].
[14] Each of the conductor layer, the elastic insulating coating layer, and the insulating base layer has a breaking elongation of 50% or more and a tensile elastic modulus of 10 to 500 MPa [11] to [13]. A garment-type electronic device described in any of the above.

Furthermore, the present invention includes the following configurations.
[15] A garment-type electronic device having an electric wiring including a conductor layer, an elastic insulating coating layer, and an insulating base layer in a portion in contact with the body surface, characterized in that the electric wiring is formed by a transfer method. Clothes-type electronic devices.

In the present invention, a wiring portion and an electrode portion of a clothing-type electronic device are configured by using a stretchable conductor having sufficient stretchability characteristics and a stretchable insulating layer having preferably sufficient stretchability and insulation property. As a result, sufficient insulation between electrodes can be maintained even during strenuous exercise without electrical breakage, and even when wet due to sweating or rainy weather, and it becomes possible to accurately measure biological signals.

The electrical wiring used in the garment-type electronic device of the present invention substantially has a step at the boundary between the electrode surface where the conductor layer or the electrode surface layer is exposed and the wiring portion covered with the elastic insulating coating layer. By eliminating it, the feeling of discomfort when wearing the clothes-type electronic device is greatly reduced, and a natural feeling of wearing is realized.
A step exists between the wiring part and the non-wiring part, but the step at the boundary between the wiring part and the non-wiring part is covered with a base layer and a cover layer, and is a gentle step. In addition, since both the high part and the low part of the step are covered layers made of the same material, there is little discomfort in touch.

However, there is an essential difference in the boundary between the electrode portion and the wiring portion that each is made of a different material. In particular, the electrode portion is composed of a conductor portion having electron conductivity such as metal or carbon, and the thermal conductivity of this portion is high. On the other hand, since the stretchable insulating coating layer is an organic material, its thermal conductivity is low. As a result of various ingenuity in the shapes of the electrodes and the wiring, the present inventors have found that the discomfort when wearing clothes is caused by the synergistic effect of the step between the electrode portion and the insulating cover portion and the difference in thermal conductivity. By locating and eliminating the step at the boundary, it was found that the discomfort when wearing can be greatly reduced.

Furthermore, in the garment-type electronic device in which the step at the boundary between the electrode portion and the wiring portion of the electrical wiring of the present invention is substantially eliminated, the insulating cover portion does not bulge with respect to the electrode portion, so that the electrode and the human body surface It is possible to smoothly make contact with each other, as well as to connect discrete parts and connectors for connecting to modules.
Improving the contact state on the surface of the human body leads to the detection accuracy of biological signals. Further, in the connector portion, since the outer shape of the connector can be covered with the insulating cover portion, it is possible to eliminate the exposure of the electrode surface. Since the mounting portion is flat with no steps, it is possible to mount the connector parts without forcing the electrode portion to be deformed at the time of mounting, and it is possible to obtain an excellent effect that the reliability of the connecting portion is improved. ..

If the thickness inside the electrical wiring part is different in each part, the elongation rate of the thick part is small and the elongation rate of the thin part is large when tension is applied to the electrical wiring, and the load is locally increased and the overall load is increased. Although there is a risk of shortening the material life, in the present invention, since the step in the electrical wiring portion is substantially small, such variation in the elongation rate is unlikely to occur, and as a result, the product life can be extended.

Is a schematic view showing a cross section when there is no electrode surface layer in the conventional electric wiring. Is a schematic view showing a cross section when an electrode surface layer is provided in conventional electrical wiring. Is a schematic view showing a cross section when there is no electrode surface layer in the electric wiring of the present invention. Is a schematic view showing a cross section when an electrode surface layer is provided in the electrical wiring of the present invention. Is a schematic process diagram showing a conventional method for manufacturing electrical wiring. Is a schematic process diagram showing an example of the method for manufacturing the electrical wiring of the present invention. Is an example of the electrical wiring pattern of the present invention. Is a schematic view showing the arrangement position of the wiring example of FIG. 7 on the sports shirt.

Hereinafter, the present invention will be described with reference to the drawings.
FIG. 3 is a schematic cross-sectional view of the electrical wiring of the present invention when there is no electrode surface layer. In this example, the conductor layer functions as an electrode as it is. Compared with FIG. 1, which is a cross section of the conventional electric wiring, the electrode surface and the stretchable insulating coating layer have the same height, so that the surface of the electric wiring is not uneven.
Figure 4. Is a schematic cross-sectional view of the electrical wiring of the present invention when there is an electrode surface layer. Compared with FIG. 3 in the case where there is an electrode surface layer in the conventional electric wiring, the electrode surface layer and the stretchable insulating coating layer have the same height, so that the electric wiring surface is not uneven.

It is self-evident that the electrical wiring in the present invention is flexible. The flexible electric wiring of the present invention is realized by being composed of a material having flexibility as a conductor layer, an elastic insulating coating layer, an insulating base layer, and an electrode surface layer constituting the electric wiring. Further, the flexible electrical wiring of the present invention is preferably made of a stretchable material having elasticity, and it is preferable that the electrical wiring has stretchability in addition to flexibility.

Hereinafter, each layer constituting the electrical wiring will be described.
In the present invention, what can be used as a base material is a cloth that constitutes a part or the whole of a garment portion of a garment-type electronic device. Examples of the cloth include woven fabrics, knitted fabrics, and non-woven fabrics, and resin-coated and resin-impregnated coated cloths can also be used as the base material. Further, a synthetic rubber sheet or the like represented by neoprene (registered trademark) can also be used as a base material. The fabric used in the present invention preferably has stretchability capable of repeatedly expanding and contracting by 10% or more. Further, the substrate of the present invention preferably has a breaking elongation of 50% or more. The base material of the present invention may be a cloth base cloth, a ribbon, a tape shape, a braid, a net braid, or a single-wafer cloth cut from the cloth base cloth.
When the cloth is a woven fabric, for example, plain weave, twill weave, satin weave, and the like can be exemplified. When the fabric is knitted, for example, flat knitting and its deformation, Kanoko knitting, Amunzen knitting, lace knitting, eyelet knitting, thread net, pile knitting, rib net, ripple knitting, turtle shell knitting, blister knitting, Milan rib knitting, Double picket edition, single picket knitting, diagonal edition, helibone edition, punch roma edition, basket edition, tricot edition, half tricot edition, satin tricot edition, double tricot edition, quinz cord edition, striped soccer edition, Russell edition, Examples of tulle mesh knitting and modifications / combinations thereof can be given. The cloth may be a non-woven fabric made of an elastomer fiber or the like.

The base layer of the present invention is a layer that bears insulation on the base material side of the wiring portion. Here, insulation includes mechanical, chemical, and biological insulation in addition to electrical insulation, and needs to have a function of insulating the conductor layer from water, chemical substances, and biological substances that permeate the base material.
The underlying layer of the present invention is preferably a flexible polymeric material. As the flexible polymer material, a material called so-called rubber or elastomer can be used. As the rubber and elastomer of the present invention, a resin material for forming a conductor layer described later can be used.
The underlying layer of the present invention preferably has stretchability capable of repeatedly expanding and contracting by 10% or more. Further, the base layer of the present invention preferably has a breaking elongation of 50% or more. Further, the underlying layer of the present invention preferably has a tensile elastic modulus of 10 to 500 MPa.
The base layer of the present invention is preferably applied onto the substrate via a coating liquid, a dipping liquid, a liquid form such as a printing ink or a printing paste, or a slurry state. In order to make the material for the base layer into a liquid form or a slurry state, it may be dissolved and dispersed in a solvent. It is within the scope of the present invention to blend known leveling agents, thixotropic agents and the like for adjusting printability and the like. The solvent is appropriately selected from the solvents and the like that can be used for the conductive paste described later.
In the present invention, as a special case, when the precursor of the material forming the base layer is a liquid, it is possible to form a layer using the precursor and to form the base layer through an appropriate reaction. be.
When it is difficult for the material for the base layer of the present invention to pass through a liquid state or a slurry state, for example, it may be processed into a film or a sheet by melt extrusion or press molding and attached to a base material with an adhesive or the like. It is possible. Further, it is also possible to obtain a film or sheet by solidifying it by a predetermined reaction after processing it into a film or sheet in a precursor state.

Conductor layer of the present invention refers to a layer specific resistance is composed of the following materials 1 × 10 ⁰ Ωcm. The conductor layer of the present invention preferably has stretchability. Stretchability in the present invention means that it can be repeatedly expanded and contracted by 10% or more. Further, the conductor layer of the present invention preferably has a breaking elongation of 40% or more, preferably 50% or more of breaking elongation, and more preferably 80% or more of breaking elongation of the conductor layer alone. Further, the conductor layer of the present invention preferably has a tensile elastic modulus of 10 to 500 MPa. A material having such stretchability is called a stretchable conductor composition.
The stretchable conductor composition can be obtained via the conductive paste described below. Hereinafter, the conductive paste, which is one of the means for realizing the constituent elements of the present invention, will be described. The conductive paste is composed of at least conductive particles, preferably non-conductive particles to be added, a stretchable resin, and a solvent.

The conductive particles of the present invention are particles having a particle size of 100 μm or less and made of a substance having ^{a specific resistance of 1 × 10 -1 Ωcm or less.} Examples of the substance having a specific resistance of 1 × 10 ^-1 Ωcm or less include metals, alloys, carbons, doped semiconductors, and conductive polymers. The conductive particles preferably used in the present invention are metals such as silver, gold, platinum, palladium, copper, nickel, aluminum, zinc, lead and tin, alloy particles such as brass, bronze, white copper and solder, and silver-coated copper. Hybrid grains, as well as metal-plated polymer particles, metal-plated glass particles, metal-coated ceramic particles, and the like can be used.

In the present invention, it is preferable to mainly use flake-shaped silver particles or amorphous aggregated silver powder. It should be noted that the term "used mainly" here means that 90% by mass or more of the conductive particles are used. The amorphous agglomerated powder is a three-dimensional aggregate of spherical or amorphous primary particles. Amorphous agglomerate powder and flake-like powder have a larger specific surface area than spherical powder and the like, and are preferable because they can form a conductive nate work even with a low filling amount. Since the amorphous agglomerated powder is not in the form of monodisperse, it is more preferable because the particles are in physical contact with each other and easily form a conductive nate work.

The particle size of the flake-like powder is not particularly limited, but it is preferable that the average particle size (50% D) measured by the dynamic light scattering method is 0.5 to 20 μm. More preferably, it is 3 to 12 μm. If the average particle size exceeds 15 μm, it becomes difficult to form fine wiring, and clogging occurs in the case of screen printing or the like. If the average particle size is less than 0.5 μm, the particles cannot be contacted with each other at low filling, and the conductivity may deteriorate.

The particle size of the amorphous agglomerated powder is not particularly limited, but the average particle size (50% D) measured by the light scattering method is preferably 1 to 20 μm. More preferably, it is 3 to 12 μm. If the average particle size exceeds 20 μm, the dispersibility is lowered and it becomes difficult to make a paste. If the average particle size is less than 1 μm, the effect as a coagulated powder is lost, and good conductivity may not be maintained with low filling.

The non-conductive particles in the present invention are particles made of an organic or inorganic insulating substance. The inorganic particles of the present invention are added for the purpose of improving printing characteristics, stretch characteristics, and coating film surface properties, and can be used for inorganic particles such as silica, titanium oxide, talc, and alumina, and microgels made of resin materials. Available.

In the present invention, barium sulfate particles can be preferably used as non-conductive particles. As the barium sulfate particles of the present invention, barium sulfate, which is a pulverized product of a barite mineral called natural barite, and so-called precipitated barium sulfate produced by a chemical reaction can be used. In the present invention, it is preferable to use precipitated barium sulfate whose particle size can be easily controlled. The average particle size determined by the dynamic light scattering method of barium sulfate particles preferably used is 0.01 to 18 μm, more preferably 0.05 to 8 μm, and even more preferably 0.2 to 3 μm. Further, the barium sulfate particles of the present invention are preferably surface-treated with one or both hydroxides and / or oxides of Al and Si. By such surface treatment, hydroxides and / or oxides of one or both of Al and Si adhere to the surface of the barium sulfate particles. The amount of these adhered elements is preferably 0.5 to 50, more preferably 2 to 30 with respect to 100 barium elements in terms of the element ratio by fluorescent X-ray analysis.

The average particle size of the barium sulfate particles is preferably smaller than the average particle size of the conductive particles. The number average particle size of the conductive particles is preferably 1.5 times or more, more preferably 2.4 times or more, and 4.5 times or more the number average particle size of the barium sulfate particles. , Even more preferable. When the average particle size of the barium sulfate particles exceeds this range, the unevenness of the obtained coating film surface becomes large, and it is easy to trigger the coating film to break when stretched. On the other hand, if the average particle size of the barium sulfate particles is smaller than this range, the effect of improving the stretch durability is small and the viscosity of the paste is high, which makes it difficult to produce the paste.

The blending amount of the barium sulfate particles in the present invention is 2 to 30% by mass, more preferably 3 to 20% by mass, still more preferably 4 to 15% by mass, based on the total amount of the conductive particles and the barium sulfate particles. If the amount of barium sulfate particles blended exceeds this range, the conductivity of the obtained coating film surface decreases. On the other hand, if the blending amount of the barium sulfate particles is smaller than this range, the effect of improving the stretch durability is less likely to be exhibited.

Examples of the flexible resin in the present invention include thermoplastic resins, thermosetting resins, and rubbers having an elastic modulus of 1 to 1000 MPa, but rubber is preferable in order to exhibit the elasticity of the film. Examples of rubber include urethane rubber, acrylic rubber, silicone rubber, butadiene rubber, nitrile group-containing rubber such as nitrile rubber and hydride nitrile rubber, isoprene rubber, sulfide rubber, styrene butadiene rubber, butyl rubber, chlorosulfonated polyethylene rubber, and ethylene propylene. Examples include rubber and vinylidene fluoride copolymer. Among these, nitrile group-containing rubber, chloroprene rubber, and chlorosulfonated polyethylene rubber are preferable, and nitrile group-containing rubber is particularly preferable. The range of the elastic modulus preferable in the present invention is 3 to 600 MPa, more preferably 10 to 500 MPa, still more preferably 30 to 300 MPa.

The rubber containing a nitrile group is not particularly limited as long as it is a rubber containing a nitrile group or an elastomer, but nitrile rubber and hydrogenated nitrile rubber are preferable. Nitrile rubber is a copolymer of butadiene and acrylonitrile, and when the amount of bonded acrylonitrile is large, the affinity with the metal increases, but the rubber elasticity that contributes to elasticity decreases. Therefore, the amount of bonded acrylonitrile in the acrylonitrile butadiene copolymer rubber is preferably 18 to 50% by mass, particularly preferably 40 to 50% by mass.

The blending amount of the flexible resin in the present invention is 7 to 35% by mass, preferably 9 to 28% by mass, more preferably 9 to 28% by mass, based on the total of the conductive particles, preferably the non-conductive particles to be added, and the flexible resin. Is 12 to 20% by mass.

Further, an epoxy resin can be blended in the conductive paste of the present invention. The preferable epoxy resin in the present invention is a bisphenol A type epoxy resin or a phenol novolac type epoxy resin. When an epoxy resin is blended, a curing agent for the epoxy resin can be blended. As the curing agent, a known amine compound, polyamine compound, or the like may be used. The curing agent is preferably blended in an amount of 5 to 50% by mass, more preferably 10 to 30% by mass, based on the epoxy resin. The blending amount of the epoxy resin and the curing agent is 3 to 40% by mass, preferably 5 to 30% by mass, and more preferably 8 to 24% by mass with respect to the total resin components including the flexible resin.

The conductive paste of the present invention contains a solvent. The solvent in the present invention is water or an organic solvent. The content of the solvent should be appropriately investigated depending on the viscosity required for the paste, and is not particularly limited, but is generally 30 to 80 when the total mass of the conductive particles, barium sulfate particles and the flexible resin is 100. The organic solvent used in the present invention having a preferable mass ratio has a boiling point of 100 ° C. or higher and lower than 300 ° C., more preferably 130 ° C. or higher and lower than 280 ° C. If the boiling point of the organic solvent is too low, there is a concern that the solvent volatilizes during the paste manufacturing process or when the paste is used, and the component ratios constituting the conductive paste are likely to change. On the other hand, if the boiling point of the organic solvent is too high, the amount of residual solvent in the dry-cured coating film increases, which may cause a decrease in the reliability of the coating film.

Examples of the organic solvent in the present invention include cyclohexanone, toluene, xylene, isophorone, γ-butyrolactone, benzyl alcohol, Solbesso 100, 150, 200 manufactured by Exxon Chemical, propylene glycol monomethyl ether acetate, tarpionel, butyl glycol acetate, and diamylbenzene. , Triamylbenzene, n-dodecanol, diethylene glycol, ethylene glycol monoethyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol monobutyl ether acetate, diethylene glycol dibutyl ether, diethylene glycol monoacetate, triethylene glycol diacetate, triethylene glycol, triethylene glycol Monomethyl ether, triethylene glycol monoethyl ether, triethylene glycol monobutyl ether, tetraethylene glycol, tetraethylene glycol monobutyl ether, tripropylene glycol, tripropylene glycol monomethyl ether, 2,2,4-trimethyl-1,3-pentanediol Examples include monoisobutyrate. As petroleum-based hydrocarbons, AF solvent No. 4 (boiling point: 240 to 265 ° C.), No. 5 (boiling point: 275 to 306 ° C.), and No. 6 (boiling point: 296 to 317 ° C.) manufactured by Nippon Oil Co., Ltd. , No. 7 (boiling point: 259 to 282 ° C.), No. 0 solvent H (boiling point: 245 to 265 ° C.), and the like, and two or more of them may be contained if necessary. Such an organic solvent is appropriately contained so that the conductive silver paste has a viscosity suitable for printing and the like.

The paste for forming an elastic conductor of the present invention is a disperser of conductive particles, barium sulfate particles, elastic resin, solvent such as a dissolver, a three-roll mill, a self-revolving mixer, an attritor, a ball mill, and a sand mill. It can be obtained by mixing and dispersing with.

The paste for forming an elastic conductor of the present invention contains known organic and inorganic additives such as imparting printability, adjusting color tone, leveling, antioxidant, and ultraviolet absorber, as long as the contents of the invention are not impaired. Can be blended.

In the present invention, it is preferable to have an elastic insulating coating layer having a breaking elongation of 80% or more, an effective thickness of 12 μm or more, and a volume resistivity of 1 GΩ · cm or more. Here, the stretchable insulating coating layer is a layer that bears insulation on the surface side of the wiring portion. Here, insulation includes mechanical, chemical, and biological insulation in addition to electrical insulation, and needs to have a function of insulating the conductor layer from water, chemical substances, and biological substances that permeate the base material.
The stretchable insulating coating layer of the present invention is preferably an insulating layer containing a flexible polymer material as a main component. As the flexible polymer material, a material called so-called rubber or elastomer can be used. As the rubber and elastomer of the present invention, a resin material for forming a conductor layer can be used.
That is, the stretchable insulating coating layer of the present invention contains a flexible resin as a main component, and the main component is a material that accounts for 55% by mass or more, preferably 75% by mass or more of the material constituting the stretchable insulating coating layer. .. Examples of the flexible resin preferably used in the present invention include thermoplastic resins, thermosetting resins, and rubbers having an elastic coefficient of 1 to 1000 MPa, and examples of rubber include urethane rubber, acrylic rubber, silicone rubber, and butadiene. Examples thereof include rubber, nitrile group-containing rubber such as nitrile rubber and hydride nitrile rubber, isoprene rubber, sulfide rubber, styrene butadiene rubber, butyl rubber, chlorosulfonated polyethylene rubber, ethylene propylene rubber, and vinylidene fluoride copolymer. Among these, nitrile group-containing rubber, chloroprene rubber, and chlorosulfonated polyethylene rubber are preferable, and nitrile group-containing rubber is particularly preferable. The range of the elastic modulus preferable in the present invention is 3 to 600 MPa, more preferably 10 to 500 MPa, still more preferably 30 to 300 MPa.
The rubber containing a nitrile group is not particularly limited as long as it is a rubber containing a nitrile group or an elastomer, but nitrile rubber and hydrogenated nitrile rubber are preferable. Nitrile rubber is a copolymer of butadiene and acrylonitrile, and when the amount of bonded acrylonitrile is large, the affinity with the metal increases, but the rubber elasticity that contributes to elasticity decreases. Therefore, the amount of bonded acrylonitrile in the acrylonitrile butadiene copolymer rubber is preferably 18 to 50% by mass, particularly preferably 40 to 50% by mass.

The stretchable insulating coating layer of the present invention preferably has stretchability capable of repeatedly stretching by 10% or more. Further, the stretchable insulating coating layer of the present invention preferably has a breaking elongation of 50% or more. Further, the elastic insulating coating layer of the present invention preferably has a tensile elastic modulus of 10 to 500 MPa.
The stretchable insulating coating layer of the present invention is preferably applied onto the substrate via a coating liquid, a dipping liquid, a liquid form such as a printing ink or a printing paste, or a slurry state. In order to make the material for the elastic insulating coating layer into a liquid form or a slurry state, it may be dissolved and dispersed in a solvent. It is within the scope of the present invention to blend known leveling agents, thixotropic agents and the like for adjusting printability and the like. The solvent is appropriately selected from solvents and the like that can be used for the conductive paste.

In the present invention, as a special case, when the precursor of the material forming the stretchable insulating coating layer is a liquid, the precursor is used to form a layer, and an appropriate reaction is performed to form a base layer. Is also possible. This case corresponds to the case where an ultraviolet curable resin or the like is used.
When the material for the stretchable insulating coating layer of the present invention is difficult to pass through in a liquid state or a slurry state, it is processed into a film or sheet by, for example, melt extrusion or press molding, and then externally processed into an appropriate shape. It is also possible to attach it to the base material with an adhesive or the like.

The effective thickness of the stretchable insulating coating layer of the present invention is preferably 12 μm or more, and more preferably 40 μm or more. The effective thickness is the arithmetic mean thickness of the insulating layer in the portion overlapping the conductor material. The effective thickness of the present invention is an arithmetic mean value obtained by randomly measuring 10 points of the coating thickness of the insulating layer in the portion overlapping the conductor material.

The elastic insulating layer coating layer of the present invention is preferably made of a material having a volume resistivity of 1 GΩ · cm or more, that is, 1 × 10 ^{9 Ω cm or more.}
The insulating base layer of the present invention has elasticity like the elastic insulating coating layer, and its material composition and insulating performance are similar to those of the elastic insulating coating layer.

In the present invention, by using the elastic insulating coating layer and the insulating base layer described above, it is possible to realize a clothing type electronic device in which the resistance value between different electrodes for detecting a biological signal is 1 GΩ or more. Further, in the present invention, it is possible to realize a clothes-type electronic device in which the resistance value between the electrodes is 1 MΩ or more when the clothes-type electronic device is wet.
Here, the resistance value between the electrodes is a value measured by an insulation resistance tester at an applied voltage of 100 volt. Since each electrode is electrically connected to the connector, the resistance value between the electrodes is substantially equal to the insulation resistance value between the connector electrodes.

The electrode surface layer in the present invention is literally a layer used when the electrode surface is coated with a material different from that of the wiring portion. As the electrode surface layer, precious metal plating such as gold, platinum, or rhodium, solder plating, tin plating, or the like can be used.
The electrode surface layer of the present invention preferably has stretchability capable of repeatedly expanding and contracting by 10% or more. Further, the electrode surface layer of the present invention preferably has a breaking elongation of 50% or more. Further, the electrode surface layer of the present invention preferably has a tensile elastic modulus of 10 to 500 MPa. When the electrode portion is also required to have stretchability characteristics as described above, the electrode surface layer can be formed by using a carbon paste having stretchability.
The carbon paste in the present invention may be considered as a material in which the conductive particles of the conductive paste forming the conductor layer are limited to conductive carbon. However, regarding the blending amount of the conductive particles, since the specific gravity of the carbon particles is smaller than that of the metal and the specific surface area is large, it is preferable to further reduce the blending amount to about half to one-eighth of the mass% of the metal powder. .. Other conditions for obtaining the carbon paste, the dispersion method, and the like are the same as those for the conductive paste.

In the present invention, the fact that there is substantially no step at the boundary between the electrode portion and the wiring portion of the electrical wiring means that the thick portion and the thin portion of the wiring do not have a clear boundary, and a change in height difference of at least 50 μm occurs. It means that the thickness changes when the width of the region is 1.0 mm or more, preferably 2.0 mm or more, and more preferably 3.0 mm or more. Such a variation in the thickness of the boundary portion may be profiled by a non-contact thickness system. More specifically, a wide double-sided tape is used on a flat plate, and the wiring part is attached together with the cloth as the base material in a state where tension is applied in the plane direction to the extent that clear slack does not occur, and the sample is used as an optical sample. The profile can be obtained with the thickness gauge of. If the boundary step is within this range, it can be said that there is virtually no step because the presence of the step is not felt to the touch.

The wiring portion of the garment-type electronic device of the present invention can be deformed to an elongation rate of 10% or more without substantially impairing the conductive function of the conductor layer and the insulating function of the elastic insulating coating layer and the insulating base layer. It is preferable to be able to do it. More specifically, the wiring portion of the clothing-type electronic device may be cut out, and the conductive function and the insulating function before and after being stretched to 10% by a tensile tester may be compared. The conductive function is evaluated by the resistance value of the wiring, and if the resistance value in the state of being stretched to 10% is 100 times or less of the resistance value when the stretchability is 0%, the conductive function is maintained. And. It is judged that the insulating base layer maintains the insulating function if it is stretched to 10% and then returned to 0%, and if there is no peeling from the base material. Further, it is judged that the elastic insulating coating layer maintains the insulating function if no cracks that can be visually confirmed are generated in the state of the elongation degree of 10%.

It is preferable that the conductor layer, the elastic insulating coating layer, and the insulating base layer of the present invention each have a breaking elongation of 50% or more and a tensile elastic modulus of 10 to 500 MPa. The breaking elongation and tensile elastic modulus of each layer can be obtained by applying the paste material constituting each layer to a predetermined film thickness on a release sheet, peeling off after drying, and performing a tensile test.

The means for realizing the electric wiring in the present invention in which there is substantially no step at the boundary between the electrode portion and the wiring portion will be described. In the present invention, the portion where the conductor layer is exposed is the electrode portion, and the portion covered with the elastic insulating coating layer is the wiring portion.
As a means for realizing the stepless electrical wiring of the present invention, a method of superimposing an extremely thin elastic insulating coating layer on a conductor layer can be exemplified. If the thickness of the conductor layer is 50 μm or more and the thickness of the stretchable insulating coating layer is less than 10 μm, there is no tactile step, and it can be considered that there is substantially no step.
As a means for realizing the stepless electrical wiring of the present invention, a base layer, a conductor layer, an elastic insulating coating layer, and if necessary, an electrode surface layer are sequentially laminated and printed on a base material, dried and cured, and then each layer is formed. An example can be exemplified of a method of performing a pressure molding process at a temperature equal to or higher than the softening temperature. Since this method requires a relatively high temperature process, the applicable base material may be limited.

In the present invention, by using the transfer method described below, it is possible to obtain an electric wiring having substantially no step.
The transfer method in the present invention is performed by printing a predetermined wiring pattern, an insulating pattern, etc. in the order of an electrode surface layer, an elastic insulating coating layer, a conductor layer, and a base layer on an intermediate medium, and then transferring the wiring pattern to a cloth as a base material. Electrical wiring can be obtained. Further, when easy transferability is required, a hot melt layer can be formed as a base layer on a wiring pattern printed on an intermediate medium in advance, and then transferred to a cloth. Further, a hot melt layer may be provided in advance as an image receiving layer on the cloth side. For such a hot melt layer, a thermoplastic urethane resin or a flexible resin similar to the binder component of the stretchable conductor composition of the present invention can be used.
In this case, a so-called release sheet such as a polymer film or paper having a release layer on the surface may be used as the intermediate medium. Further, a film, sheet, plate or the like having a surface made of a difficult-to-adhere material such as fluororesin, silicone resin or polyimide can be used. It is also possible to use a metal plate such as stainless steel, a hard chrome-plated steel plate, or an aluminum plate.

The garment-type electronic device of the present invention is preferably worn in sports where the wearer is sometimes hit. Examples of such sports include martial arts such as karate, boxing, taekwondo, kendo, fencing, and judo, and ball games such as baseball, softball, soccer, rugby, American football, tennis, table tennis, basketball, handball, and volleyball. ..

Telescopic electric wire In the present invention, an elastic wire having a breaking elongation of 50% or more can be used as an electric wiring. The thickness of the elastic wire in the present invention is preferably 2.4 mm or less including the insulating coating, preferably 1.6 mm or less including the insulating coating, and more preferably 0.8 mm or less including the insulating coating. .. Here, the thickness of the elastic wire is the diameter of the elastic wire in a state where no extension load is applied to the elastic wire. If the cross section of the elastic wire cannot be regarded as a circle, the minor axis is used as the thickness.
The stretchable electric wire in the present invention is an electric wire obtained by coating a plurality of conductive wires arranged with redundancy on the outer circumference of a stretchable core material with a braided or twill-shaped covering body. Alternatively, an electric wire formed by spirally winding a conductive wire obtained by twisting a plurality of enamel wires around the outer circumference of a stretchable core material can be exemplified.
Such elastic wires are attached to the fabric with a hot melt adhesive, etc., the elastic wires themselves are regarded as threads and sewn to the fabric, and the elastic wires are sewn to the fabric as if they were wrapped. It can be used as wiring for clothing-type electronic devices by means such as inserting it between fabrics and installing it by a method such as wrapping stitching along the seams of clothing.

Hereinafter, the present invention will be described in more detail and concretely with reference to Examples. The evaluation results in the examples were measured by the following methods.

<Amount of nitrile>
The obtained resin material was converted into mass% by mass ratio of monomers from the composition ratio obtained by NMR analysis.

<Moony Viscosity>
The measurement was performed using an SMV-300RT "Moony Viscometer" manufactured by Shimadzu Corporation.

<Average particle size>
The measurement was performed using a light scattering type particle size distribution measuring device LB-500 manufactured by HORIBA, Ltd.
<Elastic modulus, elongation at break>
Each material is coated on a release sheet so as to have a dry thickness of 100 ± 10 μm, dried and cured under predetermined conditions, and then punched together with the release sheet into a dumbbell mold specified by ISO 527-2-1A. , As a test piece. At the time of measurement, the sheet of each material was peeled off from the release sheet, and a tensile test was performed by the method specified in ISO 527-1 to obtain the measurement.

<Expansion and contraction characteristics of electrical wiring>
The electrical wiring portion of the manufactured clothing-type electronic device was cut into test pieces so that the straight portion of the wiring had a length of 100 mm, excluding the electrode portion. After visually confirming that the wiring part of the test piece is not peeled off from the fabric of the base material and that there are no cracks on the surface of the elastic insulating coating layer, the resistance value of the wiring can be measured at the end. The elastic insulation coating layer is scraped off and connected to the terminal of the resistance measuring instrument, and the clip is set in a tensile tester with insulation processing so that the stretched part has an effective length of 50 mm, and the initial resistance value and the predetermined stretch are set. The resistance value at the time of measurement and the wiring resistance value at the time of returning to the initial state were measured.
The initial resistance value is R0, the resistance value at 10% extension is R10, and the resistance change rate Rv = R10 / R0 is obtained. Loss was marked as "x". Regarding the insulating property, when there was no visually recognizable crack in the elastic insulating coating layer of the electric wiring after the test, it was evaluated as “◯” to maintain the insulating function, and when a crack occurred, it was evaluated as “x” as the loss of the insulating function. Further, when the base material and the base layer did not peel off after the test, the insulation function was maintained as “◯”, and when the insulation function was peeled off, the insulation function was lost as “x”.
The same evaluation was carried out after extending 10% and maintaining for 1 second, returning to the initial state and holding for 1 second, and repeating 100 times.

<Measurement of wiring resistance>
The resistance value of the wiring was measured using a milliohm meter manufactured by Agilent Technologies.

<Step>
A portion including the electrode portion and the wiring portion was cut into a rectangle of 50 mm × 100 mm from the clothing type electronic device to obtain a test piece. The test piece is attached to the test piece using double-sided tape with a width of 50 mm, and the wiring part with a thickness of 10 mm is attached together with the cloth as the base material so as not to cause slack. The thickness profile of was obtained.
If the absolute value of the inclination for 10 mm between the electrode side 5 mm and the wiring side 5 mm at the boundary between the electrode part and the wiring part is less than the height difference / measurement length (10 mm) = 50/3000, "◎", 50/3000 If it is equal to or more than 50/2000, it is evaluated as “◯”, if it is 50/2000 or more and less than 50/1000, it is evaluated as Δ, and if it is 50/1000 or more, it is evaluated as “x”.

<Insulation resistance>
A high resistance meter (high resistance meter) 4339B manufactured by Agilent Technologies was used, and the resistance value 1 minute after the voltage was applied at an applied voltage of 100 V was used as the insulation resistance.
<Volume resistivity of insulator>
The sample is processed into a sheet, and using a high resistance meter (high resistance meter) 4339B manufactured by Agilent Technologies and a resiliency cell, the volume resistivity is calculated from the resistance value 1 minute after the voltage is applied at an applied voltage of 500 V. Was calculated.

<Wearing feeling>
Ten adult male subjects were subjected to the first radio exercise and the second radio exercise in succession while wearing the clothes with electrical wiring prepared in the example and performing electrocardiographic measurement. Regarding the wearing feeling during that period, a sensory evaluation was performed on a five-point scale with "good touch" as 5 points and "bad touch" as 1 point. 2 or more and less than 3 was defined as Δ, and less than 2 was defined as ×.

[Manufacturing example]
<Polymerization of synthetic rubber materials>
In a stainless steel reaction vessel equipped with a stirrer and a water-cooled jacket, 54 parts by mass of butadiene, 46 parts by mass of acrylonitrile, 270 parts by mass of deionized water, 0.5 parts by mass of sodium dodecylbenzene sulfonate, and 2.5 parts by mass of sodium naphthalene sulfonate condensate. -Dodecyl mercaptan 0.3 parts by mass Triethanolamine 0.2 parts by mass Sodium carbonate 0.1 parts by mass was charged, the bath temperature was kept at 15 ° C. while flowing nitrogen, and the mixture was gently stirred. Next, an aqueous solution prepared by dissolving 0.3 parts by mass of potassium persulfate in 19.7 parts by mass of deionized water was added dropwise over 30 minutes, and after continuing the reaction for another 20 hours, 0.5 parts by mass of hydroquinone was added to deionized water 19 A polymerization termination operation was carried out by adding a dissolved aqueous solution to 5.5 parts by mass.
Next, in order to distill off the unreacted monomer, the pressure inside the reaction vessel was first reduced, and steam was further introduced to recover the unreacted monomer to obtain a synthetic rubber latex (L1) composed of NBR. Salt and dilute sulfuric acid are added to the obtained latex, and the mixture is aggregated and filtered. The amount of deionized water having a volume ratio of 20 times that of the resin is divided into 5 times, the resin is redispersed in the deionized water, and the resin is washed by repeating filtration. , Dryed in air to obtain a synthetic rubber resin R1.

The evaluation results of the obtained synthetic rubber resin R1 are shown in Table 1.
The following operations were carried out in the same manner while changing the charging raw materials, polymerization conditions, cleaning conditions and the like to obtain the resin materials R2 to R4 shown in Table 1. The abbreviations in the table are as follows.
NBR: Acrylonitrile butadiene rubber NBIR: Acrylonitrile-isoprene rubber (10% by mass of isoprene)
SBR: Styrene butadiene rubber (styrene / butadiene = 50/50% by mass)

[Manufacturing example]
1.5 parts by mass of liquid bisphenol A type epoxy resin with epoxy equivalent of 175 to 195, 10 parts by mass of elastic resin (R1) obtained in the production example, latent curing agent [Ajinomoto Fine Chemical Co., Ltd. trade name Amicure PN23] 0.5 parts by mass was mixed with 30 parts by mass of isophorone and dissolved by mixing to obtain a binder resin composition A1. Next, 58.0 parts by mass of fine flake-shaped silver powder [trade name Ag-XF301 manufactured by Fukuda Metal Foil Powder Industry Co., Ltd.] having an average particle diameter of 6 μm was added to the binder resin composition A1 and mixed uniformly, and dispersed by a three-roll mill. The conductive paste AG1 was obtained. The evaluation results of the obtained conductive paste AG1 are shown in Tables 2-1 and 2-2.

Hereinafter, the materials were changed and blended to obtain the conductive pastes AG2 to AG6 shown in Tables 2-1 and 2-2. The evaluation results are also shown in Tables 2-1 and 2-2.
In Tables 2-1 and 2-2, the amorphous silver powder 1 is the aggregated silver powder G-35 manufactured by DOWA Electronics, the average particle size is 6.0 μm, and the amorphous silver powder 2 is the aggregated silver powder G-35 manufactured by DOWA Electronics. Is a cohesive silver powder having an average particle size of 2.1 μm obtained by wet classification.

Hereinafter, in the same manner as the conductive paste, the formulations were changed according to Tables 2-1 and 2-2 to obtain carbon pastes CB1 for the electrode surface layer, base layers, and pastes CC1 and CC2 for the elastic insulating coating layer. The results are shown in Table 2-1 and Table 2-2. Shown in. For CC1 and CC2 that do not contain solid particles, the resin component was dissolved in a solvent to prepare a paste.

A clothing type electronic device for electrocardiogram measurement was manufactured by the transfer method shown in FIG.
First, carbon paste CB1, which is an electrode surface layer, was screen-printed on a 125 μm-thick release PET film in a predetermined pattern, and dried and cured. Next, the insulating paste CC1 to be the stretchable insulating coating layer was screen-printed on a predetermined pattern and dried and cured. The electrode surface layer for electrocardiographic measurement is circular with a diameter of 30 mm. The elastic insulating coating layer has a donut shape with an inner diameter of 30 mm and an outer diameter of 36 mm at the electrode portion, and the wiring portion extending from the electrode has a width of 14 mm. A circular electrode having a diameter of 10 mm is similarly printed with carbon paste. The thickness of the carbon paste layer was 25 μm in terms of dry film thickness, and the elastic insulating coating layer had a volume resistivity of 1500 GΩcm and a thickness of 15 μm.
Next, the electrode portion and the wiring portion were screen-printed using the silver paste AG1 as the conductor layer, and dried and cured under predetermined conditions. The electrode portion was circular with a diameter of 32 mm, the wiring portion was 10 mm wide, and the dry thickness on the stretchable insulating coating layer was adjusted to 30 μm. Further, the base layer is adjusted to have a drying thickness of 20 μm using the same CC1 as the elastic insulating coating layer, screen-printed and dried, and then the base layer is printed again under the same conditions to adjust the drying time. A transferable printed electrical wiring was obtained by leaving the surface tackiness so that 25% by mass of the solvent content remained.
Next, the transferable printed electrical wiring obtained by the above steps is placed on a predetermined portion of a sports shirt made of an inverted knit fabric and pressed at room temperature to temporarily bond the printed electrical wiring to the back side of the sports shirt and release the mold. The PET film was peeled off, the sports shirt was hung on a hanger, and further dried at 115 ° C. for 30 minutes to obtain a sports shirt with electrical wiring. The wiring pattern is shown in FIG. 7, and the arrangement of the wiring pattern with respect to the shirt is shown in FIG.
The obtained sports shirt with electrical wiring has a circular electrode with a diameter of 30 mm at the intersection of the left and right posterior axillary lines and the 7th rib, and is further made of an elastic conductor with a width of 10 mm from the circular electrode to the center of the posterior neck. The electrical wiring is formed inside. The wiring extending from the left and right electrodes to the center of the back neck has a gap of 5 mm at the center of the neck, and both are not short-circuited.
The insulation resistance value between the left and right electrodes is 200 GΩ, and the insulation resistance between the left and right electrodes was measured after immersing a sports shirt with electrical wiring in ion-exchanged water in a wet state and then dehydrating it in a household washing machine for 5 minutes. The value was 60 MΩ.

Next, a stainless steel snap hook is attached by penetrating the elastic conductor layer on the back side of the fabric so that it protrudes toward the surface side of the central end of the back neck, and further to ensure electrical continuity with the wiring part on the back side. The stretchable conductor composition layer and the stainless steel snap hook were sewn together using a conductive thread in which a thin metal wire was twisted into the cloth.
A heart rate sensor WHS-2 manufactured by Union Tool, which has a wireless data transmission function to the smartphone, is connected via a stainless steel snap hook, and an electrocardiographic signal is transmitted from the WHS-2 to the smartphone at the same time as the measurement. , The heartbeat sensor WHS-2 dedicated application "myBeat" is installed in the Apple smartphone, and the heartbeat data is received and set to be displayed on the screen. As described above, a sports shirt incorporating a heart rate measurement function was produced.

The subject was made to wear this shirt, and the first radio exercise and the second radio exercise were performed in succession, and the electrocardiographic data during that period was acquired. The obtained electrocardiographic data has low noise, high resolution, and has a quality that can analyze mental state, physical condition, fatigue, drowsiness, tension, etc. as an electrocardiogram from changes in heartbeat interval, electrocardiographic waveform, etc. rice field. The same shirt was worn by 10 subjects, and the feeling of wearing was evaluated. The results are shown in Table 3-1 and Table 3-2. Shown in.
A predetermined test piece is cut out from a sports shirt manufactured under the same conditions as the sports shirt used for the wearing test, and the step evaluation of the electrode / wiring boundary is evaluated. Properties The insulation of the insulating coating layer, the insulation of the underlying layer, and the maintenance performance of each were evaluated. The results are shown in Table 3-1 and Table 3-2. Shown in.

Tables 3-1 and 3-2 show the results of evaluating the initial resistance value between the electrodes, the resistance value when wet, and the resistance value between the electrodes after 50 times of washing. The resistance between the electrodes after the washing test was determined by washing with tap water using a vertical washing machine for home use, "10 minutes washing operation, 3 minutes dehydration, 2 minutes rinsing, 3 minutes dehydration, 2 minutes rinsing. It is the resistance value after repeating "dehydration for 3 minutes, rinsing for 2 minutes, dehydration for 6 minutes" 50 times and air-drying for 24 hours or more.

A forced stretching test was performed to resemble the situation used in intense sports. In this test, clothes-type electronic devices were hung on clothes hangers, and 20 1 kg weights were hung with clips on the hem. Next, lift each hanger until all the weights are lifted, hold it for 3 seconds, then lower it until all the weights land and hold it for 3 seconds. This operation is repeated 500 times as one cycle, and then the electrocardiogram measurement operation is possible. I evaluated it. When the electrocardiographic measurement could be performed without any problem, it was evaluated as "○", when an abnormality such as increased noise was observed even if the measurement was performed, it was evaluated as "Δ", and when the measurement could not be performed, it was evaluated as "×". The results are shown in Table 3-1 and Table 3-2. Shown in.

Similarly, the configurations shown in Table 3-1 and Table 3-2 are used. Sports shirts of Examples 2 to 6 and Comparative Examples 1 and 2 were produced and evaluated in the same manner. The results are shown in Table 3-1 and Table 3-2. Shown in.

Comparative Examples 3 to 5

The knitted sports shirt used in Example 1 was turned inside out, put into a formwork so that the back side was not wrinkled, and fixed by hitting pins on both shoulders and left and right hem of the shirt.
Next, a sports shirt having the same wiring pattern as in the embodiment was produced by the direct printing method shown in FIG. First, the base layer was screen-printed with CC paste in a predetermined pattern, dried under predetermined conditions, printed again under the same conditions, and dried and cured. Next, printing and drying were repeated in the order of the conductor layer, the elastic insulating coating layer, and the electrode surface layer to obtain electrical wiring. A hook was attached to the obtained sports shirt in the same manner as in the example, a heart rate sensor WHS-2 manufactured by Union Tool Co., Ltd. was connected, and the same evaluation was performed below. The results are shown in Table 3-1 and Table 3-2. Shown in.

In Comparative Example 1, the wiring portion was broken at the time of the first wearing, and the electrocardiographic data could not be obtained. In Comparative Example 2, the initial electrocardiographic data could be acquired without any problem, but noise increased in the process of performing the radio exercise, and the data could not be acquired in the middle of the second radio exercise. In Reference Examples 1 to 3, data could be acquired until the end, but in Comparative Example 3 in which the initial specific resistance was relatively large, the resistance value at the time of stretching was 100 times the initial resistance value in the 100-time repeated stretching test. It was evaluated as "x".

As shown above, in the garment-type electronic device of the present invention, by arranging the device and the connector on the back neck, biological signal measurement during exercise can be surely performed, and impact and strong stretching distortion will be applied. It was shown that the measurement can be performed stably even during intense sports, and that it will show sufficient durability.
As described above, the garment-type electronic device in the present invention has an electric wiring composed of an elastic electrode surface layer, an elastic elastic insulating coating layer and a base layer, and an elastic conductor layer. Further, since there is substantially no step at the boundary between the electrode portion and the wiring portion, it has excellent characteristics that achieve both good electrical characteristics and good wearing feeling.
Good wearing feeling is in a more natural state without causing mental noise due to uncomfortable wearing, especially when seeking the mental state of the wearer based on physical data such as electrocardiographic data. It can be said that there is a big objection in terms of application of such clothing-type electronic devices because the mental evaluation of the above is possible.

The present invention is not limited to the application examples exemplified in this embodiment, and is a sensor provided with information possessed by the human body, that is, bioelectric potential such as myoelectric potential and electrocardiographic potential, and biological information such as body temperature, pulse, and blood pressure on clothing. Wearable devices for detection, clothing with an electric heating device, wearable devices with a sensor for measuring clothing pressure, clothing for measuring body size using clothing pressure, soles It can be widely applied to socks type devices for measuring pressure. In addition, since the stretchable wiring with no surface step works in a good direction for the connection with parts and connectors, the present invention presents the wiring portion of clothes, tents, bags, etc. in which flexible solar cell modules are integrated in textiles. It can be applied to low-frequency treatment devices having joints, wiring parts such as thermal treatment machines, and flexibility sensing parts. Such a wearable device can be applied not only to a human body but also to an animal such as a pet or a domestic animal, or a mechanical device having an expansion / contraction part, a bending part, etc. It can also be used as electrical wiring for systems that are connected and used. It is also useful as a wiring material for implant devices that are to be embedded in the body.

1. 1. Base material (fabric)
2. Insulation base layer 3. Stretchable conductor composition layer (stretchable conductor layer)
4. Elastic cover layer (elastic insulation coating layer)
5. Elastic carbon layer (electrode surface layer)
6. Adhesive layer (insulation base layer)
10. Temporary support (remove indicator)

Claims (7)

In clothing-type electronic devices used for measuring biological information, at least
a. With multiple electrodes that come into direct contact with the body surface,
b. A connector for connecting to an electronic device having a body potential data measurement function and at least a data storage function or a communication function,
c. Electrical wiring for electrically connecting the electrode and the connector,
The connector is provided in the central portion of the back neck of the garment, the breaking elongation of the electrical wiring is 40% or more, and the thick portion and the thin portion of the wiring of the electrical wiring are clear. A garment-type electronic device having no boundary and having a width of a transition region in which a change in height difference of at least 50 μm occurs with a width of 1.0 mm or more. The clothing-type electronic device according to claim 1, wherein the electrode that comes into direct contact with the body surface is made of an elastic conductor layer having a breaking elongation of 40% or more. The invention according to claim 1 or 2, wherein the electrode in direct contact with the body surface is made of an elastic conductor layer having a breaking elongation of 50% or more, and the thickness of the elastic conductor layer is 300 μm or less. Clothes-type electronic equipment. The clothing type electronic according to any one of claims 1 to 3, wherein the electrical wiring is made of an elastic conductor layer having a breaking elongation of 50% or more, and the thickness of the elastic conductor layer is 300 μm or less. device. 7. Clothes-type electronic equipment. The biometric information is the time change of the electrocardiographic potential, and there are a pair of left and right electrodes that come into direct contact with the body surface, and they are arranged symmetrically with the center line of the back of the part corresponding to the back of the human body in between. The garment-type electronic device according to any one of claims 1 to 5, which is a feature. The garment-type electronic device according to any one of claims 1 to 6, wherein the garment-type electronic device is worn in a sport in which the wearer is hit.

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