WO2023013299A1

WO2023013299A1 - Biological information measurement member, and biological information measurement clothing

Info

Publication number: WO2023013299A1
Application number: PCT/JP2022/025672
Authority: WO
Inventors: 翔太森本; 智之宮本; 雄一郎表
Original assignee: 東洋紡株式会社; 東洋紡Ｓｔｃ株式会社
Priority date: 2021-08-04
Filing date: 2022-06-28
Publication date: 2023-02-09
Also published as: JPWO2023013299A1

Abstract

The present invention provides a biological information measurement member with which it is possible to reduce the discomfort of a section where a capacitor is mounted during exercise, and also provides biological information measurement clothing equipped with said biological information measurement member.　This biological information measurement member is characterized by comprising a stretchable capacitor having a first film, a first electroconductive layer, a second film, a second electroconductive layer, and a third film in the stated order, wherein at least one film among the first film, the second film, and the third film has an outer edge section positioned further outward than the outer edges of the first electroconductive layer and the second electroconductive layer, and said outer edge section is secured to a cloth by thread.

Description

Biometric information measurement member and biometric information measurement clothing

The present invention relates to biometric information measurement members and biometric information measurement clothing.

Stretchable capacitors that can be attached to clothing have been known for some time. For example, in Patent Literature 1, a conductive material comprising an engaging portion, a first stretchable cover layer, a first stretchable conductive layer, a stretchable dielectric layer, a second stretchable conductive layer, and a second stretchable cover layer in this order A removable stretchable capacitor containing a laminate is disclosed.

Japanese Patent No. 6863509

Conventionally, the part of the garment where the elastic capacitor was attached was difficult to stretch, and the body movement in the stretching direction was hindered, and the wearer sometimes felt uncomfortable. To date, various efforts have been made to improve such impediments to body movement. It is fixed by a member, and since the engaging member is detached by elongation of a predetermined load or more, the hindrance to the wearer's body movement has been reduced to some extent. However, in recent years, there has been a demand for a further reduction in wearer's sense of discomfort. SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and its object is to provide a biometric information measuring member capable of reducing discomfort in a capacitor mounting portion during exercise, and a biometric information measuring device comprising the biometric information measuring member. to provide clothing for

A biological information measuring member according to an embodiment of the present invention is as described in [1] below.
[1] A stretchable capacitor having, in order, a first film, a first conductive layer, a second film, a second conductive layer, and a third film,
At least one of the first film, the second film, and the third film forms an outer edge located outside the outer edges of the first conductive layer and the second conductive layer. and wherein the outer edge portion is fixed to the fabric with a thread.

The outer edge portion of the film outside the outer edge of the conductive layer is a portion that stretches more easily than the portion where the conductive layer exists. By fixing such easily extensible portions to the fabric, inhibition of elongation of the fabric at the capacitor mounting portion is reduced. Furthermore, since the form of the fixed part by the thread is a point or a line, inhibition of expansion of the fabric at the fixed part is reduced as compared with the case of using a fixing member such as a hook-and-loop fastener in which the form of the fixed part is a surface. Therefore, it is possible to further reduce the uncomfortable feeling of the wearer during exercise. Preferred aspects of the biometric information measuring member and the biometric information measuring clothing are as described in any one of the following [2] to [10].

[2] The first film, the second film, and the third film each have the outer edge portion positioned outside the outer edge of the first conductive layer and the second conductive layer. The biological information measuring member according to [1], wherein the outer edge portion is fixed to the fabric by the thread.
[3] The member for measuring biological information according to [1] or [2], wherein at least part of the thread extends from the inner side to the outer side of the outer edge of the outer edge portion.
[4] The stretchable capacitor is elongated,
one end of the first conductive layer in the length direction of the stretchable capacitor extends along a first diagonal direction that is slanted with respect to the length direction;
One end of the second conductive layer in the length direction extends along a second diagonal direction that is slanted in a direction opposite to the first diagonal direction with respect to the length direction [ 1] to [3], the member for measuring biological information.
[5] Among the outer edge portions, extension portions contacting both width direction side surfaces of the first conductive layer and the second conductive layer and extending in the length direction are fixed to the fabric by the thread. The biological information measuring member according to [4].
[6] The biological information measuring member according to [4] or [5], wherein both ends of the outer edge in the length direction are fixed to the fabric by the thread.
[7] Any one of [1] to [6], wherein the thread is separated from the outer edges of the first conductive layer and the second conductive layer by a distance equal to or greater than the thickness (μm) of the stretchable capacitor The biological information measuring member described.
[8] The biological information measuring member according to any one of [1] to [7], wherein the stretchable capacitor is fixed to the surface of the fabric opposite to the skin side.
[9] Clothing for measuring biological information, including the member for measuring biological information according to any one of [1] to [8].
[10] The biological information measurement garment according to [9], wherein the fabric is at least part of the garment.

According to the present invention, with the configuration described above, it is possible to obtain a biological information measuring member capable of reducing discomfort in the capacitor mounting portion during exercise, and a biological information measuring garment including the biological information measuring member.

FIG. 1 is a plan view of a biological information measuring member according to an embodiment. FIG. 2 is a cross-sectional view taken along line II-II of FIG. FIG. 3 is a cross-sectional view of a biological information measuring member according to another embodiment. FIG. 4 is a cross-sectional view of a biological information measuring member according to still another embodiment.

Hereinafter, the present invention will be described in more detail based on the following embodiments, but the present invention is not limited by the following embodiments, and can be modified appropriately within the scope of the above and later descriptions. Of course, it is also possible to implement by adding and all of them are included in the technical scope of the present invention. In addition, the dimensions of various members in the drawings may differ from the actual dimensions, since priority is given to helping to understand the features of the present invention.

A member for measuring biological information according to an embodiment of the present invention is a stretchable member having, in order, a first film, a first conductive layer, a second film, a second conductive layer, and a third film. at least one of the first film, the second film, and the third film extends outwardly from outer edges of the first conductive layer and the second conductive layer. It has a positioned outer edge, said outer edge being fixed to the fabric by a thread.

The outer edge portion of the film outside the outer edge of the conductive layer is a portion that stretches more easily than the portion where the conductive layer exists. By fixing such easily extensible portions to the fabric, inhibition of elongation of the fabric at the capacitor mounting portion is reduced. Furthermore, since the form of the fixed part by the thread is a point or a line, inhibition of expansion of the fabric at the fixed part is reduced as compared with the case of using a fixing member such as a hook-and-loop fastener in which the form of the fixed part is a plane. Therefore, it is possible to reduce discomfort of the wearer during exercise.

The configuration of the biological information measuring member according to the embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a plan view of a biological information measuring member according to an embodiment. FIG. 2 is a cross-sectional view taken along line II-II of FIG. FIG. 3 is a cross-sectional view of a biological information measuring member according to another embodiment. FIG. 4 is a cross-sectional view of a biological information measuring member according to still another embodiment. In addition, in each drawing, there are cases where member numbers and the like are omitted, but in that case, the specification and other drawings shall be referred to.

As shown in FIGS. 1 and 2, the biometric information measuring member 1 has an elastic capacitor 2 . As shown in FIG. 2, the elastic capacitor 2 consists of a first film 11, a first conductive layer 21, a second film 12, a second conductive layer 22, and a third film 13 in order. have.

As shown in FIG. 2, the first film 11, the second film 12, and the third film 13 are outside the

outer edges

21a, 22a of the first conductive layer 21 and the second conductive layer 22, respectively. and the

outer edges

11 b , 12 b , 13 b of the film are fixed to the fabric 3 by threads 4 . The

outer edge portions

11b, 12b, and 13b of the film are portions that are easier to stretch than the portions where the first conductive layer 21 and the second conductive layer 22 are present, and by fixing the portions to the fabric 3 with the thread 4, , the inhibition of elongation of the fabric 3 by the elastic capacitor 2 is reduced. Furthermore, since the three layers of the

outer edge portions

11b, 12b, and 13b of the film are present in the portion fixed to the cloth 3 by the thread 4, that is, the sewn portion, the strength of the sewn portion of the film can be improved.

The member for measuring biological information 1 is not limited to the above aspect, and at least one of the first film 11, the second film 12, and the third film 13 includes the first conductive layer 21 and the second film. It may have an outer edge located outside the

outer edges

21 a and 22 a of the conductive layer 22 , and the outer edge may be fixed to the fabric 3 with the thread 4 . That is, at least one of the

outer edges

11a, 12a, 13a of the film is located outside the

outer edges

21a, 22a of the conductive layer, and at least one of the

outer edges

11b, 12b, 13b of the film is attached to the fabric 3 by the thread 4. It may be fixed.

For example, at least one of the

outer edges

11a, 12a, 13a of the film is located outside the

outer edges

21a, 22a of the conductive layer, and any one of the

outer edges

11b, 12b, 13b of the film is the thread 4. It may be fixed to the fabric 3 by In this case, like the member 5 for measuring biological information shown in FIG. It is preferably fixed to the fabric 3 by 4. Since any one of the films is fixed to the fabric 3 by the thread 4 in this way, the sewn portion becomes thin and easily stretchable. Furthermore, since the first conductive layer 21 and the second conductive layer 22 arranged on both sides of the second film 12 expand and contract as the second film 12 expands and contracts, the first conductive layer 21 and the second conductive layer 22 expand and contract. The conductive layer 22 of 2 is easily expanded and contracted uniformly, and the measurement accuracy is improved. Further, although not shown, the outer edge 11a of the

outer edges

11a, 12a, and 13a of the film may be present on the outermost side in the width direction, and only the outer edge portion 11b of the film may be fixed to the fabric 3 by the thread 4. . Alternatively, the outer edge 13 a of the film may exist on the outermost side in the width direction, and only the outer edge 13 b of the film may be fixed to the fabric 3 with the thread 4 .

At least two of the

outer edges

11a, 12a, 13a of the film are located outside the

outer edges

21a, 22a of the conductive layer, and any two of the

outer edges

11b, 12b, 13b of the film are the thread 4. It may be fixed to the fabric 3 by In this case, like the member 6 for measuring biological information shown in FIG. It is preferably fixed to the fabric 3 by As a result, since tension is not applied directly to the second film 12, ie, the dielectric layer, deterioration of the dielectric layer can be reduced.

Although not shown, in the width direction, the

outer edges

11a, 12a of the

outer edges

11a, 12a, 13a of the film are present outside the outer edge 13a, and the

outer edge portions

11b, 12b of the film are attached to the fabric 3 by the thread 4. It may be fixed. Also, the

outer edges

12a and 13a of the film may be present outside the outer edge 11a, and the

outer edge portions

12b and 13b of the film may be fixed to the cloth 3 by the thread 4.

As shown in FIG. 1, at least part of the thread 4 preferably extends from the inside to the outside of the outer edge 10c of the outer edge 10b of the film. As a result, the fabric 3 can be stretched more easily than when only the portion where the film exists is sewn. Furthermore, since the number of holes in the film formed by sewing can be reduced compared to the case where only the portion where the film exists is sewn, the durability of the outer edge portion 10b of the film can be improved. The outer edge 10c of the outer edge portion 10b of the film in FIG. 1 is the outermost outer edge of the film in plan view. Further, when the outer edge portion 10b of the film is composed of the outer edge portions of a plurality of films, and the positions of the outer edges of the films are not aligned, at least part of the thread 4 is positioned on the innermost outer edge of the film in plan view. It is more preferable that the outer edge portion of the film positioned from the inner side to the outermost side of the outer edge of the film extends from the outer edge of the outer edge of the film. For example, in the embodiment shown in FIG. 3, at least part of the thread 4 extends from the inside of the

outer edges

11a and 13a of the innermost film to the outer edge of the outermost film in plan view. It is more preferable to exist outside the outer edge 12a of the .

Of the total length (cm) of the outer edge 10c of the outer edge portion 10b, the ratio of the portion where the thread 4 exists from the inner side to the outer side of the outer edge 10c is preferably 30% or more, and is 60% or more. is more preferably 80% or more, even more preferably 90% or more, and most preferably 100%. This makes it easier for the elastic capacitor 2 to follow the expansion and contraction of the fabric 3 . On the other hand, when a different sewing method is adopted for each part as described later, the ratio may be 95% or less, 85% or less, 70% or less, or 50%. It may be below.

The sewing with the thread 4 may be machine sewing using a sewing machine or the like, or may be hand sewing. As a sewing method, straight stitching, triple stitching, elastic stitching, zigzag stitching, tight stitching, dotted line zigzag stitching, triple zigzag stitching, overlock stitching, blindstitch, elastic blindstitch, buttonhole stitching, etc. are preferable. These may be used singly or in combination of two or more. Among these, at least one selected from the group consisting of straight stitches, stretch stitches, zigzag stitches, tight stitches, dotted zigzag stitches, triple zigzag stitches, blind stitches, and stretch stitches is more preferable, and stretch stitches, zigzag stitches, At least one selected from the group consisting of dotted zigzag stitches, triple zigzag stitches, and stretch blind stitches is more preferable.

As shown in FIGS. 2 and 4, it is preferable that the portion of the first film 11 other than the sewn portion by the thread 4 is not fixed to the fabric 3 . As a result, the expansion inhibition of the fabric 3 by the elastic capacitor 2 is further reduced. Furthermore, this makes it difficult for the opening of the fabric 3 to be transmitted to the stretchable capacitor 2, thereby suppressing the occurrence of cracks in the conductive layer. As shown in FIG. 3, when a film other than the first film 11 is sewn onto the fabric 3, the entire surface of the first film 11 facing the fabric 3 may not be fixed to the fabric 3. .

As shown in FIG. 1, the stretchable capacitor 2 is elongated, and one end 21A of the first conductive layer 21 in the length direction X of the stretchable capacitor 2 is a first conductive layer inclined with respect to the length direction X. and one end portion 22A of the second conductive layer 22 in the length direction X is inclined in a direction opposite to the first diagonal direction with respect to the length direction X in a second diagonal direction. It preferably extends along the direction As a result, information associated with expansion and contraction is detected in the portion of the first conductive layer 21 and the second conductive layer 22 that extends along the length direction X, and the first conductive layer 21 and the second conductive layer 22 are separated from each other. An electrical signal can be transmitted to one end portion 21A and one end portion 22A of the conductive layer 22 extending along the oblique direction.

When the stretchable capacitor 2 is elongated, the maximum length in the length direction X is preferably at least twice, and at least three times the maximum length in the width direction perpendicular to the length direction X. More preferably, it may be 20 times or less, or 10 times or less.

As shown in FIG. 1, circular electrodes 27 are preferably provided at one end 21A of the first conductive layer 21 and one end 22A of the second conductive layer 22, respectively. Each circular electrode 27 needs only to be electrically connected to the first conductive layer 21 or the second conductive layer 22, and is configured separately from the first conductive layer 21 or the second conductive layer 22. Alternatively, it may be made of the same material as the first conductive layer 21 or the second conductive layer 22 .

A clasp 28 is preferably provided at the center of the circular electrode 27 as shown in FIG. An electronic unit can be attached via the clasp 28 . The clasp 28 is preferably electrically conductive with the circular electrode 27 . This allows electrical connection between the conductive layer and the electronic unit via the clasp. The clasp includes metal snap hooks and snap fasteners, preferably stainless steel.

Although not shown, the electronic unit is preferably capable of analyzing changes in capacitance. The electronic unit is preferably attachable to and detachable from clothing. The electronic unit may further comprise display means, storage means, communication means, USB connectors and the like. The electronic unit may include, for example, a sensor that can measure environmental information such as temperature, humidity, and atmospheric pressure, a sensor that can measure position information using GPS, an accelerometer, and the like.

As shown in FIG. 1 , extension portions 15 extending in the length direction X in contact with both side surfaces in the width direction of the first conductive layer 21 and the second conductive layer 22 of the outer edge portion 10 b are attached to the cloth 3 by the thread 4 . is preferably fixed to This makes it easier for the elastic capacitor 2 to follow the expansion and contraction of the cloth 3 in the length direction X. Note that the width direction in FIG. 1 corresponds to a direction perpendicular to the length direction X. As shown in FIG. Further, in this aspect, the one end portion 10A and the other end portion 10B in the length direction X of the outer edge portion 10b to be described later may not be fixed to the fabric 3 by the thread 4 . Moreover, it is preferable that the extension portion 15 is positioned between the one end portion 10A and the other end portion 10B in the length direction X. As shown in FIG.

As shown in FIG. 1, both ends of the outer edge portion 10b in the length direction X, that is, the one end portion 10A and the other end portion 10B are preferably fixed to the cloth 3 by the thread 4. As a result, tension in the length direction X is easily applied to the stretchable capacitor 2 , and the expansion and contraction of the fabric 3 in the length direction X can be easily followed. In this aspect, the extending portion 15 may not be fixed to the fabric 3 by the thread 4 . As a result, noise accompanying expansion and contraction in directions other than the length direction X can be reduced.

Although not shown, the sewing method may differ depending on each part. For example, one end portion 10A and the other end portion 10B in the length direction X of the outer edge portion 10b are fixed to the fabric 3 by straight stitching, while the extension portion 15 of the outer edge portion 10b is fixed to the fabric 3 by zigzag stitching. may be As a result, the extending portion 15 of the zigzag stitch is likely to expand and contract in the length direction X, while the one end portion 10A and the other end portion 10B of the straight stitch are firmly fixed to the fabric 3, so that tension in the length direction X is reduced. is easily transmitted to the elastic capacitor 2.

As shown in FIG. 1, the outer edge portion 10b of the film is preferably fixed to the cloth 3 with a thread 4 over the entire circumference. This makes it easier for the stretchable capacitor 2 to follow the stretch in the length direction X of the fabric 3 .

The thread 4 is preferably separated from the

outer edges

21a and 22a of the first conductive layer 21 and the second conductive layer 22 by a distance equal to or greater than the thickness (μm) of the stretchable capacitor 2. As a result, the expansion inhibition of the fabric 3 by the elastic capacitor 2 is reduced. The distance is preferably 1.5 times or more the thickness (μm) of the elastic capacitor 2, more preferably 2 times or more, further preferably 5 times or more, and 10 times or more. It is even more preferred to have On the other hand, the distance is preferably 100 times or less the thickness (μm) of the elastic capacitor 2, more preferably 50 times or less, and even more preferably 30 times or less. This makes it easier for the stretchable capacitor 2 to follow the stretch of the fabric 3 .

As shown in FIG. 2, the stretchable capacitor 2 is preferably fixed to the surface 3B of the fabric 3 opposite to the skin-side surface 3A. As a result, it is possible to avoid discomfort due to contact of the stretchable capacitor 2 with the wearer's skin. The stretchable capacitor 2 may be fixed to the surface 3A of the fabric 3 on the skin side.

The fabric 3 is preferably a woven fabric, a knitted fabric, or a nonwoven fabric, more preferably a woven fabric or a knitted fabric, and even more preferably a knitted fabric. These may be used alone or in combination of two or more. The thread forming the fabric 3 may be either stretchable or non-stretchable. For example, if the yarns forming the woven fabric are not stretchable, the bias direction of the woven fabric may be aligned with the length direction X direction. Threads constituting the nonwoven fabric are preferably stretchable.

The knitted fabric is preferably a warp knitted fabric or a weft knitted fabric, more preferably a warp knitted fabric. As weft knitted fabrics (circular knitted fabrics), jersey knitting (flat knitting), bare jersey knitting, welted jersey knitting, milling knitting (rubber knitting), pearl knitting, single bag knitting, smooth knitting, tuck knitting, floating knitting, single hem knitting, Examples include those having a knitted structure such as lace knitting and fleece knitting. A warp knitted fabric having a knitting structure such as single denby knitting, open denby knitting, single atlas knitting, double cord knitting, half base knitting, satin knitting, tricot knitting, half tricot knitting, raschel knitting, jacquard knitting, etc. is preferred. Of these, tricot knitting and half tricot knitting are more preferred, and those having a two-way tricot knitting structure are even more preferred. These may be used singly or in combination of two or more.

The average thickness of the fabric 3 is preferably 100 μm or more, more preferably 300 μm or more, still more preferably 500 μm or more, and preferably 1500 μm or less, more preferably 1200 μm or less, further preferably 1000 μm or less. is. The basis weight of the fabric 3 is preferably 100 g/m ² or more, more preferably 150 g/m ² or more, preferably 300 g/m ² or less, more preferably 200 g/m ² or less, It is more preferably 180 g/m ² or less.

The fibers that make up the fabric 3 are preferably natural fibers, synthetic fibers, regenerated fibers, semi-synthetic fibers, etc., more preferably synthetic fibers and semi-synthetic fibers, and still more preferably synthetic fibers. Natural fibers include cotton, hemp, wool, silk, and the like. Natural fibers may be used as they are, but may be subjected to post-processing such as hydrophilic treatment and antifouling treatment. Examples of synthetic fibers include urethane, acryl, polyesters such as polyethylene terephthalate, polyethylene naphthalate and polylactic acid, and polyamides such as nylon 6 and nylon 66. Regenerated fibers include rayon, lyocell, cupra, and the like. Semi-synthetic fibers include acetate and the like. Only one of these may be used, or two or more thereof may be used.

As the thread 4, a sewing thread can be mentioned, and a thread made of an insulating material is preferable. The yarn 4 may be spun yarn, filament plied yarn, filament resin processed yarn, or the like. Also, the thread 4 may be an inelastic thread, but is preferably an elastic thread. Elastic threads include polyurethane elastic threads, polyester elastic threads, polyolefin elastic threads, natural rubber threads, synthetic rubber threads, and the like. Only one of these may be used, or two or more thereof may be used.

The first film 11 and the third film 13 (hereinafter simply referred to as cover films) preferably contain a stretchable resin. The elastic resin content of the cover film is preferably 60% by mass or more, more preferably 80% by mass or more, still more preferably 90% by mass or more, still more preferably 95% by mass or more, and most preferably 100% by mass. preferable.

The stretchable resin of the cover film preferably has a tensile yield elongation of 70% or more, more preferably 85% or more, still more preferably 120% or more, further preferably 150% or more. more preferred. The tensile yield elongation may be 300% or less, or 250% or less.

Tensile yield elongation is a curve (SS curve) obtained by a general tensile test, with the load (or strength) on the vertical axis and the strain (or elongation or elongation) on the horizontal axis. , the elongation at the yield point, the first point at which an increase in elongation is observed without increasing load. The yield point is regarded as a point that roughly indicates the boundary of the transition from elastic deformation to plastic deformation.

As the stretchable resin for the cover film, for example, elastomers, thermoplastic resins, thermosetting resins, rubbers, etc. having an elastic modulus of 1 to 1000 MPa are preferable. Examples of rubber include urethane rubber, acrylic rubber, silicone rubber, butadiene rubber, nitrile group-containing rubber such as nitrile rubber and hydrogenated nitrile rubber, isoprene rubber, vulcanized rubber, styrene rubber, styrene-butadiene rubber, butyl rubber, and chlorosulfonated polyethylene. rubber, ethylene propylene rubber, vinylidene fluoride copolymer, and the like. Only one of these may be used, or two or more thereof may be used. The elastic modulus of the elastic resin is preferably 2 to 480 MPa, more preferably 3 to 240 MPa, even more preferably 4 to 120 MPa. The materials and structures of the first film 11 and the third film 13 may be the same or different, but are preferably the same.

Urethane rubber is preferable as the elastic resin for the cover film. Since urethane rubber has a high elongation rate and small tensile permanent strain and residual strain, it is excellent in reliability when repeatedly deformed. Examples of urethane rubbers include urethane rubbers containing polyether polyol or polyester polyol as a polyol component and HDI-based polyisocyanate as an isocyanate component.

As the cover film, specifically, a hot-melt sheet obtained by processing a polyester urethane resin, a polyether urethane resin, or the like having a softening temperature of 40°C to 120°C into a sheet may be used.

The average thickness of each cover film is preferably 10-200 μm, more preferably 20-100 μm.

The cover film is preferably a non-stretched film or a uniaxially stretched film, more preferably a non-stretched film. The cover film is preferably made of elastic resin. The cover film is preferably fiber-free. Moreover, it is preferable that the cover film does not contain a fiber-containing sheet such as a fabric. As a result, the outer edge portion 11b of the first film and the outer edge portion 13b of the third film can be easily stretched, and inhibition of stretching of the fabric 3 at the fixed portion is reduced.

The second film 12 is sandwiched between the first conductive layer 21 and the second conductive layer 22 and can function as a dielectric layer of the elastic capacitor 2 .

It is preferable that the relative permittivity of the second film 12 under no load is high. Specifically, the dielectric constant is preferably 2.2 or higher, more preferably 2.8 or higher, even more preferably 3.4 or higher, and even more preferably 3.8 or higher. The dielectric constant may be 500 or less, 150 or less, or 80 or less. The dielectric constant of the film can be measured, for example, under the conditions of a temperature of 23° C. and a frequency of 1 GHz, by a cavity resonator perturbation method using a network analyzer manufactured by Anritsu.

The second film 12 preferably contains a flexible resin. The content of the flexible resin in the second film 12 is preferably 60% by mass or more, more preferably 80% by mass or more, still more preferably 90% by mass or more, and even more preferably 95% by mass or more.

The second film 12 is preferably a non-stretched film or a uniaxially stretched film, more preferably a non-stretched film. Also, the second film 12 preferably does not contain fibers. Moreover, it is preferable that the second film does not contain a fiber-containing sheet such as a fabric. As a result, the outer edge portion 12b of the second film can be easily stretched, and the stretch inhibition of the fabric 3 at the fixed portion is reduced.

As the flexible resin for the second film 12, for example, elastomers, thermoplastic resins, thermosetting resins, rubbers, etc. having an elastic modulus of 1 to 1000 MPa are preferable. Examples of rubber include urethane rubber, acrylic rubber, silicone rubber, butadiene rubber, nitrile group-containing rubber such as nitrile rubber and hydrogenated nitrile rubber, isoprene rubber, vulcanized rubber, styrene rubber, styrene-butadiene rubber, butyl rubber, and chlorosulfonated polyethylene. rubber, ethylene propylene rubber, vinylidene fluoride copolymer, and the like. Only one of these may be used, or two or more thereof may be used. The elastic modulus of the flexible resin is preferably 2 to 480 MPa, more preferably 3 to 240 MPa, even more preferably 4 to 120 MPa.

The flexible resin of the second film 12 preferably has a polar group introduced into its molecular chain. Thereby, the dielectric constant of the second film 12 can be improved. Polar groups include nitrile groups, ketone groups, ester groups, halogen substituents, hydroxyl groups, carboxyl groups, nitro groups, halogen groups and the like. Moreover, the dielectric constant of the second film 12 can be increased by including a high dielectric constant filler having a high dielectric constant in the flexible resin. Inorganic fillers such as titanates are preferred as high dielectric constant fillers.

The dielectric constant of the inorganic filler is preferably less than 5. This can reduce peeling at the interface between the inorganic filler and the resin. The dielectric constant of the inorganic filler is more preferably 4 or less, more preferably 3 or less. The content of the inorganic filler having a dielectric constant of less than 5 in the second film 12 is preferably 10% by mass or more, more preferably 20% by mass or more. On the other hand, by setting the inorganic filler in the second film 12 to 80% by mass or less, the Poisson's ratio of the second film 12 can be improved, and the capacitance change can be improved. Therefore, the content of the inorganic filler having a dielectric constant of less than 5 is preferably 80% by mass or less, more preferably 70% by mass or less. The content of the inorganic filler having a dielectric constant of 5 or more in the second film 12 is preferably 10% by mass or less, more preferably 3% by mass or less, even more preferably 1% by mass or less, and even more preferably 1% by mass or less. Preferably, it is 0.3% by mass or less.

The average thickness of the second film 12 is preferably 0.3-1000 μm. As a result, it is possible to improve the followability to expansion and contraction while increasing the capacitance and maintaining the detection sensitivity. The average thickness is more preferably 0.4 to 100 μm, still more preferably 0.5 to 70 μm, even more preferably 0.6 to 50 μm. Thereby, the detection sensitivity can be improved.

The first conductive layer 21 and the second conductive layer 22 (hereinafter simply referred to as conductive layers) preferably contain a conductive filler and a flexible resin. The content of the flexible resin in the conductive layer is preferably 7 to 35% by mass, more preferably 9 to 28% by mass, based on the total 100% by mass of the conductive filler and the flexible resin. It is preferably 12 to 20% by mass. The conductive layer may contain one or more conductive fillers. The conductive layer may also contain one or more flexible resins.

The total content of the flexible resin and the conductive filler is preferably 90% by mass or more, more preferably 95% by mass or more, most preferably 100% by mass, based on 100% by mass of the conductive layer. .

The conductive layer can be obtained, for example, by kneading and mixing a conductive filler and a flexible resin and molding the mixture into a sheet. Preferably, a solvent or the like is added to the metal particles and the flexible resin to form a paste or slurry, which can be processed into a sheet by coating and drying. Moreover, after making a paste, it is possible to impart a predetermined shape by printing.

Conductive fillers include conductive particles. The conductive particles preferably have a specific resistance of 1×10 ⁻¹ Ωcm or less and an average particle diameter (50% D) of 100 μm or less as measured by a dynamic light scattering method. Materials having a resistivity of 1×10 ⁻¹ Ωcm or less include metals, alloys, carbon, doped semiconductors, conductive polymers, and the like. Examples of conductive particles include metal particles such as silver, gold, platinum, palladium, copper, nickel, aluminum, zinc, lead, and tin; alloy particles such as brass, bronze, cupronickel, and solder; hybrid particles such as silver-coated copper; Metal-plated polymer particles, metal-plated glass particles, metal-coated ceramic particles, and the like are preferred. Only one of these may be used, or two or more thereof may be used.

As the conductive particles, flaky powder or amorphous cohesive powder is preferable. Since these have a larger specific surface area than spherical powders and the like, they can form a conductive network even with a low content. Irregularly shaped agglomerated powder is spherical or irregularly shaped primary particles that are not in a monodispersed form but are three-dimensionally aggregated, and the particles are in physical contact with each other, so it is easy to form a conductive network. Therefore, it is more preferable. The content of the flaky silver particles and the amorphous aggregated silver powder is preferably 90% by mass or more based on 100% by mass of the conductive particles.

The flaky powder preferably has an average particle size (50% D) of 0.5 to 20 µm, more preferably 3 to 12 µm, as measured by a dynamic light scattering method. As a result, fine wiring can be easily formed, and clogging caused by screen printing or the like can be reduced. In addition, this can improve conductivity.

The amorphous aggregated powder preferably has an average particle size (50% D) of 1 to 20 µm, more preferably 3 to 12 µm, as measured by a dynamic light scattering method. This improves dispersibility and facilitates pasting. Moreover, this makes it easier to maintain the effect as agglomerated powder, that is, good conductivity at low filling.

Other examples of conductive fillers include carbon-based fillers. Black soot, ketjen black, furnace black, carbon nanotube, carbon nanocone, fullerene and the like are preferable as the carbon-based filler. Only one of these may be used, or two or more thereof may be used.

The flexible resin of the conductive layer is preferably a resin with a tensile modulus of 1 MPa or more and 1000 MPa or less. The tensile modulus is more preferably 2 to 480 MPa, still more preferably 3 to 240 MPa, still more preferably 4 to 120 MPa.

Specific examples of flexible resins include thermoplastic resins, thermosetting resins, and rubbers with a tensile modulus of 1 MPa or more and 1000 MPa or less. As the flexible resin, urethane resin and rubber are preferable. Examples of rubber include urethane rubber, acrylic rubber, silicone rubber, butadiene rubber, nitrile group-containing rubber such as nitrile rubber and hydrogenated nitrile rubber, isoprene rubber, vulcanized rubber, styrene-butadiene rubber, butyl rubber, chlorosulfonated polyethylene rubber, and ethylene. Propylene rubber, vinylidene fluoride copolymer and the like can be mentioned. Of these, nitrile group-containing rubber, chloroprene rubber and chlorosulfonated polyethylene rubber are preferred, and nitrile group-containing rubber is particularly preferred. Only one of these may be used, or two or more thereof may be used.

The nitrile group-containing rubber is not particularly limited as long as it is a nitrile group-containing rubber or elastomer, and nitrile rubber and hydrogenated nitrile rubber are preferred. Nitrile rubber is a copolymer of butadiene and acrylonitrile, and when the amount of bound acrylonitrile is large, the affinity with metals increases, but rubber elasticity, which contributes to stretchability, decreases. Therefore, the amount of bound acrylonitrile in the acrylonitrile-butadiene copolymer rubber is preferably 18-50% by mass, more preferably 40-50% by mass.

The content of the flexible resin in the conductive layer is preferably 7 to 35% by mass, more preferably 9 to 28% by mass, based on the total 100% by mass of the conductive particles, the non-conductive particles, and the flexible resin. %, more preferably 12 to 20 mass %.

The non-stretched resistivity of the conductive layer is preferably 3×10 ⁻³ Ωcm or less, more preferably 1×10 ⁻³ Ωcm or less, and even more preferably 3×10 ⁻⁴ Ωcm or less. , 1×10 ⁻⁴ Ωcm or less. As a result, the resistance distribution in the conductive layer can be reduced, and high frequency characteristics and pulse responsiveness are improved.

The average thickness of the conductive layer is preferably 10-200 μm, more preferably 20-100 μm.

The first conductive layer 21 and the second conductive layer 22 may each consist of a plurality of conductive layers. Examples of such a first conductive layer 21 include a layer in which a conductive layer containing a metal-based filler and a conductive layer containing a carbon-based filler are provided in this order under the second film 12 . As the second conductive layer 22, a conductive layer containing a metal-based filler and a conductive layer containing a carbon-based filler are sequentially provided on the second film 12, for example.

As a method of laminating each layer of the stretchable capacitor 2, a method of stacking sheets or a method of laminating by screen printing or the like can be mentioned. Further, each layer may be laminated by melt-extrusion molding, or may be laminated by printing or coating pasted material.

Between each layer of the elastic capacitor 2, other layers, adhesives, etc. may be included. For example, a hot melt adhesive may be present between the film and the conductive layer. As the hot-melt adhesive, a polymeric material having a softening temperature of about 30° C. to 150° C. is preferable, and a polymeric material having flexibility with elasticity comparable to that of the conductive layer is more preferable. Examples of such hot-melt adhesives include those using ethylene-based copolymers, styrene-based block copolymers, polyurethane-based, acrylic-based copolymers, and olefin-based polymers or copolymers as base polymers. .

It is preferable that the stretchable capacitor 2 does not contain a fiber-containing sheet such as cloth between the first conductive layer 21 and the second conductive layer 22 . Thereby, variations in the strength of the elastic capacitor 2 can be reduced.

The average thickness of the stretchable capacitor 2 is preferably 1500 μm or less, more preferably 700 μm or less, even more preferably 450 μm or less, still more preferably 200 μm or less, and particularly preferably 150 μm or less. This makes it easier for the elastic capacitor 2 to expand and contract, and prevents the elastic capacitor 2 from stretching the cloth 3 . On the other hand, the average thickness of the stretchable capacitor 2 may be 50 μm or more, or may be 60 μm or more.

Since the stretchable capacitor 2 causes a change in capacitance due to tensile deformation, this can be used to detect pressure, strain, displacement, degree of deformation, and the like. For example, by attaching the stretchable capacitor 2 to the chest or abdomen, respiration can be measured from thoracoabdominal displacement. It can also be applied to motion capture by attaching it to joints such as elbows and knees.

The present invention also includes a biological information measurement garment including any of the biological information measurement members described above. Clothing includes clothing that covers at least a portion of the chest, abdomen, and joints. Clothing may be, for example, a strip or underwear. Belt-like objects include elbow joint belts, wrist belts, knee joint belts, shoulder joint belts, chest belts, abdominal belts, and the like. Undergarments include underwear for the upper body, underwear for the lower body, and the like. Undergarments for the upper body include T-shirts, polo shirts, camisoles, brassieres, sports underwear, hospital gowns, sleepwear, and the like. Undergarments for the lower body include pants, sports innerwear, hospital clothes, nightwear, and the like.

The fabric 3 is preferably at least part of clothing. As described above, the fabric 3 is preferably a fabric that directly constitutes the clothes for biometric information measurement, but may be a fabric that is layered on the clothes. That is, the fabric 3 may be a piece of cloth or the like other than the clothes, and the elastic capacitor is sewn to the piece of cloth or the like and attached to the clothes to produce the clothes for biometric information measurement. may

It is preferable that the stretchable capacitor 2 is provided on the clothing so as to be positioned at least partly of the wearer's chest, abdomen, and joints. A garment may have a plurality of stretchable capacitors 2 .

This application claims the benefit of priority based on Japanese Patent Application No. 2021-128582 filed on August 4, 2021. The entire contents of the specification of Japanese Patent Application No. 2021-128582 filed on August 4, 2021 are incorporated herein by reference.

Reference Signs List

1, 5, 6 member for biological information measurement 2 elastic capacitor 3 fabric 3A skin side surface of fabric 3B front side surface of fabric 4

thread

11a, 12a, 13a outer edge of

film

10b, 11b, 12b, 13b outer edge of film 10c outer edge of outer edge 10A one end of film 10B other end of film 11 first film 12 second film 13 third film 15 extension 21 first conductive layer 21A one end of first conductive layer 22 second conductive layer 22A one end of the second conductive layer 26 branch 27 circular electrode 28 clasp

Claims

a first film;
a first conductive layer;
a second film;
a second conductive layer;
a stretchable capacitor having in turn a third film;
At least one of the first film, the second film, and the third film forms an outer edge located outside the outer edges of the first conductive layer and the second conductive layer. and wherein the outer edge portion is fixed to the fabric with a thread.
The first film, the second film, and the third film each have an outer edge located outside the outer edges of the first conductive layer and the second conductive layer, 2. The biological information measuring member according to claim 1, wherein said outer edge portion is fixed to said cloth by said thread.
The biological information measuring member according to claim 1, wherein at least part of the thread extends from the inner side to the outer side of the outer edge of the outer edge portion.
The stretchable capacitor is elongated,
one end of the first conductive layer in the length direction of the stretchable capacitor extends along a first diagonal direction that is slanted with respect to the length direction;
One end of the second conductive layer in the length direction extends along a second diagonal direction that is slanted in a direction opposite to the first diagonal direction with respect to the length direction. Item 1. The biological information measuring member according to item 1.
3. An extension portion extending in the length direction and in contact with both side surfaces in the width direction of the first conductive layer and the second conductive layer in the outer edge portion is fixed to the cloth by the thread. 5. The biological information measuring member according to 4.
The biological information measuring member according to claim 4, wherein both ends in the length direction of the outer edge are fixed to the fabric with the thread.
The biological information measuring member according to claim 1, wherein the thread is separated from the outer edges of the first conductive layer and the second conductive layer by a distance equal to or greater than the thickness (μm) of the elastic capacitor.
The biological information measuring member according to claim 1, wherein the stretchable capacitor is fixed to the surface of the fabric opposite to the skin side.
A biological information measuring garment comprising the biological information measuring member according to any one of claims 1 to 8.
The garment for measuring biological information according to claim 9, wherein the fabric is at least part of the garment.