JP2023104811A - Lower wear - Google Patents

Abstract

To provide lower wear, on the premise of measuring a respiration state of a wearer and further, including a localized stretch sensor capable of acquiring a signal with high SN ratio.SOLUTION: Lower wear 1 capable of measuring a respiration state of a wearer comprises a lower wear body 2 including a waist edge opening part 2a at a position higher than the height of a navel position of a wearer, and a stretch sensor extending in a waist circumference direction at a position of the height of the navel part of the wearer or higher than the height of the navel position.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a lower garment capable of measuring a wearer's respiratory condition.

In recent years, wearable biological information measuring devices (sensing wear) have been attracting attention in the fields of health monitoring, medical care, nursing care, and rehabilitation. A wearable biological information measuring device is a device in which a biological information measuring device is attached to, for example, a belt or a strap, and which can easily measure biological information such as an electrocardiogram by wearing the device. As a biological information measuring device, for example, one in which electrodes for biological information measurement are formed in contact with the wearer's skin is known.

In the case of a clothing-type wearable biological information measurement device, electrodes are provided on the fabric of the body, and by wearing this clothing in daily life, it is possible to measure information related to respiratory conditions in various daily situations. For example, as shown in FIGS. 9 to 11 of Patent Document 1, there is known a wearable biological information measuring device in which stretchable sensors are attached to upper and lower garments. Stretchable capacitors can detect body displacements such as limb movement, system, respiration, mastication, swallowing, pulsation, and fetal movement.

WO 2021/199599 (Figures 9 to 11)

By the way, in order to obtain a useful respiratory signal from the stretchable sensor, it is required that the signal has a high SN ratio. Basic research has not yet been conducted to determine whether it can be obtained.
The present invention is premised on providing a lower garment capable of measuring the wearer's respiratory state, and an object of the present invention is to provide a lower garment in which the position of an elastic sensor capable of acquiring a signal with a high SN ratio is specified. and

The inventors have experimented with placing stretchable sensors at various locations on the lower garment, or conducted trial and error, including from patterning the lower garment body. As a result, the bottom garment according to the embodiment of the present invention is as described in [1] below, and more preferably as described in [2] to [8] below.

[1] A lower garment capable of measuring the wearer's respiratory condition,
a lower garment body in which the furring opening is positioned higher than the navel of the wearer;
a stretch sensor extending in the waist circumference direction at or above the navel of the wearer.

As in the configuration [1] above, the lower garment body in which the furring opening is at a position higher than the navel of the wearer, and the height of the navel of the wearer or higher than the navel By configuring the stretch sensor to extend in the waist circumference direction at an elevated position, the signal-to-noise ratio of the respiratory signal from the stretch sensor can be increased.

[2] The bottom garment according to [1], which has a base fabric extending in the waist circumference direction, and wherein the stretch sensor is fixed to the outside of the base fabric.

[3] further comprising a band-shaped stretchable fabric connected to the base fabric and extending in the direction around the waist, nanofiber fibers being formed on the wearer's side of the strip-shaped stretchable fabric; The bottom garment according to [2], in which nanofiber fibers are not formed on the wearer's side of the base fabric.

[4] The stretch sensor includes at least one capacitor extending in the waist circumference direction, a first electrode member provided on one end side of the extending direction of the capacitor, and the first electrode member. It has a cushion pad arranged between the base fabric and a protective film covering the capacitor, and the protective film is positioned on the other end side of the capacitor in the extending direction of the capacitor. Any of [1] to [3], wherein an extending portion extending distally in the circumferential direction from the portion is formed, and the protective film and the base fabric are sewn together at the extending portion. or the lower garment according to paragraph 1 above.

[5] The lower garment of [4], wherein the length of the extending portion in the waist circumferential direction is longer than the width of the capacitor.

[6] The lower garment according to [4] or [5], wherein the peripheral portion of the protective film is sewn to the base fabric.

[7] The expansion/contraction sensor further has a second electrode member provided on one end side in the extending direction of the capacitor, and the cushion pad comprises the first electrode member, the second electrode member, and the The lower garment according to any one of [4] to [6], which is arranged between the base material and the cushion pad and whose rigidity is higher than that of the base material.

[8] When the base material is placed in a natural state, the width of the undulations in the thickness direction of the capacitor formed on the base material is larger than the width of the undulations in the thickness direction of the base material. The lower garment according to any one of -[7].

According to the present invention, it is possible to provide a lower garment with a high signal-to-noise ratio of a signal indicating a respiratory condition obtained from a stretchable sensor.

FIG. 1 is a plan view of a lower garment according to an embodiment of the invention. FIG. 2 is a graph showing respiratory signals obtained from lower garments in an example of the present invention and a comparative example. FIG. 3 is a plan view of the lower garment according to the embodiment of the present invention, which is an enlarged view of the vicinity of the elastic sensor in FIG. 4 is a IV-IV cross-sectional view of the lower garment in FIG. 3. FIG. 5 is a VV cross-sectional view of the lower garment in FIG. 3. FIG.

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. It is of course possible to carry out in addition, 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.

Hereinafter, the construction of a lower garment according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5. FIG.
FIG. 1 is a plan view of the lower garment according to the embodiment. As shown in FIG. 1, a lower garment 1 according to an embodiment of the present invention has a lower garment main body 2, and a furring edge opening 2a of the lower garment main body 2 extends to the navel of the wearer. It is located higher than the height of the department. A stretch sensor 3 extending around the waist is attached to the lower body 2. - 特許庁The expansion/contraction sensor 3 expands in the waist circumference direction (a-axis direction) when the wearer inhales, and conversely contracts in the waist circumference direction when the wearer exhales. The expansion/contraction sensor 3 thus detects the breathing condition of the wearer. The expansion/contraction sensor 3 is a device capable of generating an electric signal corresponding to the expansion/contraction distance.

In the present invention, the attachment position of the stretch sensor 3 to the lower garment main body 2 is at or above the navel of the wearer. The wearer's respiratory condition can be grasped from the electrical signal detected by the stretch sensor 3. In order to obtain a useful electrical signal for detailed analysis of the wearer's respiratory condition, the present inventors thought that increasing the SN ratio of the electrical signal was more important than increasing the amplitude of the electrical signal. Therefore, an experiment was conducted to verify the SN ratio of the electrical signal by preparing a lower garment with a sufficiently deep rise than the normal lower garment, and changing the mounting height (in the height direction) of the expansion sensor 3 variously (Examples 1 to 3). 2, Comparative Example 1) was performed.

FIG. 2 is a graph showing the intensity of electrical signals obtained by the expansion/contraction sensor 3. In FIG. In the experiment, as shown in Fig. 2, the subject was asked to take five normal breaths (first period), then five deep breaths (second period), and finally for about 10 seconds (third period). ), and they were asked to hold their breath. In this experiment, since a capacitance sensor was used as the expansion/contraction sensor 3, the vertical axis representing the electrical signal represents capacitance (pF). The horizontal axis is elapsed time (seconds). In FIG. 2, the dotted line shows the results of Example 1 (the stretch sensor 3 is placed 5 cm above the navel), and the solid line (bold) shows the results of Example 2 (the stretch sensor 3 is placed at the navel). The solid line (thin line) shows the results of Comparative Example 1 (where the stretch sensor 3 is placed 8 cm below the navel). The stretch sensor 3 was installed at the center of the front body of the lower garment main body 2 in each case.

Furthermore, based on the graph of FIG. 2, the SN ratio of the signal from the expansion sensor 3 in Examples 1 and 2 and Comparative Example 1 was calculated, which is shown in Table 1 below. In the calculation of the SN ratio, the signal amount (S) is the average value of the capacitance amplitude (difference between the maximum value and the minimum value) (if you breathe 5 times, the average value of 5 times), and the noise amount (N) is the capacitance amplitude (difference between the maximum value and the minimum value in the third period) during breath holding (third period).

As shown in Examples 1 and 2 in Table 1, when the mounting position of the stretch sensor 3 is set at the height of the navel of the wearer or at a position higher than the height of the navel, the SN ratio is Although the value was 4 or more, the SN ratio was less than 3 when the stretch sensor 3 was attached at a position below the navel of the wearer as shown in Comparative Example 1. Based on the above knowledge, in the present invention, the attachment position of the stretchable sensor 3 to the lower garment main body 2 is set at the navel of the wearer, or at a height direction (c-axis direction) higher than the navel of the wearer. high position. The mounting position of the extension sensor 3 is preferably at least 1 cm above the height of the navel, more preferably at least 2 cm above the height of the navel, and even more preferably at least 3 cm above the height of the navel. . In addition, since it is assumed that the stretch sensor 3 is attached to the lower garment main body 2, from a practical point of view, the upper limit of the mounting position of the stretch sensor 3 is preferably 15 cm or less above the navel, more preferably is 12 cm or less above, more preferably 9 cm or less above.

Although there are no particular restrictions on the mounting position of the stretch sensor 3 in the direction around the waist (a-axis direction) of the lower garment body 2, the stretch sensor 3 is stretched by the wearer's breathing. It is preferably provided on the front body. More preferably, when the width of the front body is 100, the range of 80 centering on the center of the width of the body is more preferable, and the range of 60 is more preferable. In the embodiment of the present invention, the position of the expansion/contraction sensor 3 is the central position of the expansion/contraction sensor 3 itself in the longitudinal direction and the central position of the expansion/contraction sensor 3 itself in the lateral direction.

In the embodiment of the present invention, it is preferable that the stretch sensor 3 is fixed to the outside of the base fabric. In the case where the stretch sensor 3 is fixed inside (on the wearer's side), there is a possibility that the stretch sensor 3 will be hindered from expanding and contracting. It is from. The base fabric 2b may be a fabric prepared separately from the lower garment main body 2, or may be a fabric constituting the lower garment main body 2. As shown in FIG.

An embodiment in which the expansion/contraction sensor 3 is a capacitive sensor will be described below with reference to FIGS. 3 to 5. FIG. FIG. 3 is a plan view of part of the lower garment according to the embodiment of the present invention, showing an enlarged area near the elastic sensor. 4 is a IV-IV cross-sectional view of the lower garment in FIG. 3, and FIG. 5 is a VV cross-sectional view of the lower garment in FIG. As shown in FIGS. 3 to 5, the expansion/contraction sensor 3 includes a capacitor 4 extending in the waist circumference direction, and a first electrode member 6a and a first electrode member 6a provided at one end of the capacitor 4 in the extending direction. The two electrode members 6c, the cushion pad 7 arranged between the first electrode member 6a and the second electrode member 6c, and the base fabric 2b, the protective film 5 covering the capacitor, and the base film covering the capacitor 4 from below. 15. On the other end side of the extending direction of the capacitor 4, the protective film 5 is formed with an extending portion 5a extending distally in the waist circumferential direction from the end portion of the capacitor 4, and the extending portion 5a provides protection. The film 5 and the base fabric 2b are sewn together. The expansion/contraction sensor 3 receives tension in the direction around the waist according to the wearer's breathing, so the protective film 5 is more likely to shift in the a-axis direction than in the c-axis direction. Therefore, in order to prevent such deviation, it is preferable to provide a sewn portion to the base fabric 2b in the extending portion 5a in the waist circumferential direction. Further, as shown in FIG. 3, by setting the length of the extending portion 5a in the waist circumferential direction to be longer than the width W of the capacitor 4, the effect of preventing displacement is reliably exhibited. Furthermore, by sewing the peripheral portion of the protective film 5 to the base fabric 2b, it is possible to reliably prevent the positional deviation of the protective film 5 while giving a certain degree of freedom to the movement of the capacitor 4.

As shown in FIGS. 3 and 4, the lower garment 1 preferably further includes a belt-like elastic fabric 2c connected to the base fabric 2b and extending in the waist circumference direction. It is preferable that nanofiber fibers (not shown) are formed on the wearer's side of the belt-shaped elastic fabric 2c, while nanofiber fibers are not formed on the wearer's side of the base material fabric 2b. Since the nanofiber fibers come into contact with the wearer and play a non-slip role, it is possible to prevent the expansion/contraction sensor 3 from deviating from its intended position. On the other hand, since the nanofiber fibers are not formed on the wearer's side of the base material 2b, the stretch sensor 3 expands and contracts freely according to the wearer's breathing in the region where the base material 2b exists. do not interfere.

As shown in FIG. 3, the expansion/contraction sensor 3 has two or more electrode members (first electrode member 6a and second electrode member 6c), and the rigidity of the cushion pad 7 is equal to that of the base fabric 2b. It is preferable to make it higher than the rigidity. Even if the base fabric 2b is soft, the cushion pad 7 has high rigidity, so the relative positions of the first electrode member 6a and the second electrode member 6c can be stabilized. Therefore, it can be easily connected to a plurality of electrodes (not shown) of the electrical component facing the first electrode member 6a and the second electrode member 6c.

When the base material 2b is placed in a natural state, it is preferable that the width of the undulations in the thickness direction of the capacitor 4 formed on the base material 2b is larger than the width of the undulations in the thickness direction of the base material 2b. . For example, by fixing the base cloth 2b in a state in which the protective film 5 is not subjected to much tension, the undulation width in the thickness direction of the capacitor 4 can be made relatively large. With such a configuration, a length play occurs in the a-axis direction of the capacitor 4, and this play eliminates the need to pick up subtle movements of the wearer's waist length as noise. The SN ratio of the signal can be further improved.

The navel height of the lower garment main body 2 depends on the size of the lower garment main body 2, but when the lower garment main body 2 is laid flat, it is located 20 to 25 cm above the crotch in the height direction. When it is necessary to define more strictly, it is determined by having the lower garment 1 worn on Truso (BASICBODY MB220H) manufactured by Nanasai Co., Ltd.

A preferred embodiment of the capacitor 4 will be described below. As shown in FIG. 5, the stretchable sensor 3 includes a base film 15 formed on the base fabric 2b, a first conductive layer 4a, an insulating layer 4b, a second conductive layer 4c, and a protective film 5. and in order.

The protective film 5 may have an outer edge located outside the outer edges of the first conductive layer 4a and the second conductive layer 4c, and the outer edge may be fixed to the base fabric 2b with a thread. Since the protective film 5 is fixed by the thread in this manner, the sewn portion of the protective film 5 becomes thinner and thus becomes easier to stretch, thereby facilitating relaxation of the tension. As a result, the first conductive layer 4a and the second conductive layer 4c arranged on both sides of the insulating layer 4b expand and contract with the expansion and contraction of the insulating layer 4b, so that the first conductive layer 4a and the second conductive layer 4c are uniform. It becomes easy to expand and contract. Therefore, the accuracy of measurement by the capacitor 4 is improved.

The load A (N/cm) when the capacitor 4 is stretched by 20% is preferably larger than the load B (N/cm) when the base fabric 2b is stretched by 20%. Thereby, the elongation of the first conductive layer 4a and the second conductive layer 4c accompanying the elongation of the base fabric 2b can be reduced. The load A is preferably two times or more the load B, more preferably three times or more, and even more preferably four times or more. On the other hand, the load A may be 50 times or less the load B, 40 times or less, 20 times or less, or 10 times or less. Moreover, when the capacitor 4 is elongated, the load A and the load B are preferably the loads when the capacitor is elongated by 20% in the a-axis direction.

The load A (N/cm) when the capacitor 4 is stretched by 20% is preferably 1.5 N/cm or more, more preferably 3 N/cm or more. On the other hand, the load A (N/cm) when the capacitor 4 is stretched by 20% may be 20 N/cm or less, or may be 15 N/cm or less.

The load B (N/cm) when the base fabric 2b is stretched by 20% is preferably 0.3 N/cm or more, more preferably 0.6 N/cm or more, and still more preferably 1.0 N/cm or more. On the other hand, the load B (N/cm) when the base fabric 2b is stretched by 20% may be 4 N/cm or less, 3 N/cm or less, or 2 N/cm or less. .

The load (N/cm) when the capacitor 4 is stretched by 20% can be measured, for example, by the following method. A rectangular sample with a width of about 2 cm is cut out from the 5-layer portion of the capacitor 4 having the protective film 5 in order. Next, using Orientec's Tensilon RTM-250, the rectangular sample was elongated at a distance between chucks of 5.0 cm and an elongation speed of 300 mm / min, and the rectangular sample was elongated by 20% (displacement 1.0 cm). The load per unit width (N/cm) of the rectangular sample applied at times may be measured. Note that the width of the rectangular sample and the distance between chucks may be changed according to the dimensions of the capacitor 4 . In addition, the load (N/cm) at 20% elongation of the base fabric 2b or the like can also be measured by the same method as for the capacitor 4.

When the protective film 5 is fixed to the base fabric 2b by the thread as described above, the form of the fixing part becomes a point or a line, so there is a certain degree of freedom. The discomfort felt by the wearer at the fixed portion can be reduced more than in the case of using a member.

The sewing of the protective film 5 with thread 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.

It is preferable that the base fabric 2b is not fixed to the base fabric 2b other than the sewn part by the thread. As a result, the load on the first conductive layer 4a and the second conductive layer 4c due to the elongation of the base fabric 2b is alleviated. Specifically, the opening of the base fabric 2b is less likely to be transmitted to the stretchable capacitor 4, thereby suppressing the occurrence of cracks in the conductive layer. As shown in FIG. 3, when a film other than the base fabric 2b is sewn to the base fabric 2b, the entire surface of the base fabric 2b on the side of the base fabric 2b is fixed to the base fabric 2b. preferably not.

Capacitor 4 is preferably elongated. When the capacitor 4 is elongated, the maximum length in the length direction (a-axis direction) is preferably at least twice, and at least three times the maximum length in the width direction of the capacitor 4. is more preferable, and may be 20 times or less, or may be 10 times or less.

As shown in FIG. 3, one end portion 4aA of the first conductive layer 4a of the capacitor 4 in the a-axis direction extends along a first oblique direction inclined with respect to the a-axis direction, and the second conductive layer 4c One end portion 4cA in the a-axis direction preferably extends along a second oblique direction that is opposite to the first oblique direction with respect to the a-axis direction. As a result, when the capacitor 4 is used as the stretchability sensor 3, information accompanying expansion and contraction is detected in the portion extending along the a-axis direction of the first conductive layer 4a and the second conductive layer 4c. An electrical signal can be transmitted to one end portion 4aA and one end portion 4cA of the conductive layer 4a and the second conductive layer 4c extending along the oblique direction.

As shown in FIG. 3, one end 4aA of the first conductive layer 4a is preferably connected to the first electrode member 6a, and one end 4cA of the second conductive layer 4c is preferably connected to the second electrode member 6c. The first electrode member 6a is electrically connected to the first conductive layer 4a, and the second electrode member 6c is electrically connected to the second conductive layer 4c. may be configured. The first electrode member 6a and the first conductive layer 4a may be integrally formed of the same material, and the second electrode member 6c and the second conductive layer 4c may be integrally formed of the same material.

Although not shown, the electronic unit connected to the first electrode member 6a and the second electrode member 6c is preferably capable of analyzing biological information such as changes in capacitance and electrocardiographic information. 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.

It is preferable that the thread for sewing the protective film 5 is separated from the outer edges of the first conductive layer 4a and the second conductive layer 4c by the thickness (μm) of the capacitor 4 or more. As a result, the load on the first conductive layer 4a and the second conductive layer 4c due to the elongation of the base fabric 2b is alleviated. The distance is preferably 1.5 times or more the thickness (μm) of the capacitor 4, more preferably 2 times or more, further preferably 5 times or more, and 10 times or more. is even more preferred. On the other hand, the distance may be 100 times or less, 50 times or less, or 30 times or less the thickness (μm) of the capacitor 4 .

The base fabric 2b 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. This makes it difficult for the body movement of the wearer of the clothes to be hindered. These may be used alone or in combination of two or more. The thread forming the base fabric 2b may be either stretchable or non-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.

The average thickness of the base fabric 2b 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, and still more preferably The basis fabric 2b having a thickness of 1000 μm or less preferably has a basis weight of 100 g/m ² or more, more preferably 150 g/m ² or more, preferably 300 g/m ² or less, and 200 g/m ² or less. It is more preferably 180 g/m ² or less.

The fibers constituting the base fabric 2b 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 for sewing the protective film 5, a sewing thread can be mentioned, and a thread made of an insulating material is preferable. The yarn may be a spun yarn, a filament plied yarn, a filament resin processed yarn, or the like. Further, the thread 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.

It is preferable that the base fabric 2b and the protective film 5 contain an elastic resin. The elastic resin content of the protective film 5 is preferably 60% by mass or more, more preferably 80% by mass or more, still more preferably 90% by mass or more, even more preferably 95% by mass or more, and 100% by mass. Most preferred.

The elastic resin of the protective film 5 preferably has a tensile yield elongation of 70% or more, more preferably 85% or more, still more preferably 120% or more, and preferably 150% or more. Even 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 load (or strength) on the vertical axis and 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 protective film 5, for example, an elastomer, a thermoplastic resin, a thermosetting resin, rubber, or the like having an elastic modulus of 1 to 1000 MPa is 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. The elastic modulus of the elastic resin is preferably 2 to 480 MPa, more preferably 5 to 240 MPa, even more preferably 10 to 120 MPa. The materials and structures of the base cloth 2b and the protective film 5 may be the same or different, but are preferably the same.

Urethane rubber is preferable as the elastic resin for the protective film 5 . 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. In addition, acrylic rubber can be used as the elastic resin of the protective film 5 .

As the protective film 5, 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. Styrene-based hot melt can be used as the hot melt material.

The average thickness of each protective film 5 is preferably 10 to 200 μm, more preferably 20 to 100 μm.

The protective film 5 preferably does not contain a fiber-containing sheet such as fabric. As a result, the outer edge of the protective film 5 can be easily stretched, and the load on the first conductive layer 4a and the second conductive layer 4c due to the stretching of the base cloth 2b can be easily alleviated.

The insulating layer 4b is sandwiched between the first conductive layer 4a and the second conductive layer 4c, and may be used as a dielectric layer of the capacitor 4 or as a simple insulating layer. When it is used as an insulating layer, the description of the protective film 5 can be referred to for its material and the like. A hot-melt layer is not used for the insulating layer 4b, but a hot-melt layer may be arranged on the side surface of the base fabric 2b of the protective film 5 in some cases. A case where the insulating layer 4b is used as a dielectric layer will be described below.

It is preferable that the dielectric constant of the insulating layer 4b 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 insulating layer 4b preferably contains a flexible resin. The content of the flexible resin in the insulating layer 4b 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.

Preferably, the insulating layer 4b does not contain a fiber-containing sheet such as fabric. As a result, the outer edge of the protective film 5 can be easily stretched, and the load on the first conductive layer 4a and the second conductive layer 4c due to the stretching of the base cloth 2b can be easily alleviated.

As the flexible resin for the insulating layer 4b, for example, an elastomer, a thermoplastic resin, a thermosetting resin, rubber, or the like having an elastic modulus of 1 to 1000 MPa is 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. The elastic modulus of the flexible resin is preferably 2 to 480 MPa, more preferably 5 to 240 MPa, even more preferably 10 to 120 MPa.

It is preferable that the flexible resin of the insulating layer 4b has a polar group introduced into its molecular chain. Thereby, the dielectric constant of the insulating layer 4b 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 insulating layer 4b 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, still more preferably 3 or less. The content of the inorganic filler having a dielectric constant of less than 5 in the insulating layer 4b 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 insulating layer 4b to 80% by mass or less, the Poisson's ratio of the insulating layer 4b 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 insulating layer 4b 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 It is 0.3% by mass or less.

The average thickness of the insulating layer 4b is preferably 0.3 to 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 4a and the second conductive layer 4c (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, it is also possible to impart a predetermined shape by printing after making a paste.

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.

As the conductive particles, flaky powders or amorphous cohesive powders are preferred. 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 cohesive 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 the conductive filler 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.

The flexible resin of the conductive layer is preferably a resin having 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 5 to 240 MPa, still more preferably 10 to 120 MPa.

Specific examples of flexible resins include thermoplastic resins, thermosetting resins, and rubbers having a tensile elastic 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. In addition, it is also preferable to use acrylic rubber as the flexible resin.

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 4a and the second conductive layer 4c may each consist of a plurality of conductive layers. As such a first conductive layer 4a, a conductive layer containing a metal-based filler and a conductive layer containing a carbon-based filler are provided in this order under the insulating layer 4b. As the second conductive layer 4c, a conductive layer containing a metal-based filler and a conductive layer containing a carbon-based filler are provided in this order on the insulating layer 4b.

As a method of laminating each layer of the capacitor 4, a method of stacking sheets, 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.

Other layers, adhesives, etc. may be included between the layers of the capacitor 4 . 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 capacitor 4 does not include a fiber-containing sheet such as cloth between the first conductive layer 4a and the second conductive layer 4c. Thereby, variations in the strength of the capacitor 4 can be reduced.

The average thickness of the capacitor 4 is preferably 100 μm or more, more preferably 250 μm or more, even more preferably 500 μm or more, and particularly preferably 1000 μm or more. Thereby, the load when the laminate is stretched can be improved. On the other hand, the average thickness of capacitor 4 may be 3000 μm or less.

Capacitor 4 is preferably an elastic capacitor. Due to the configuration in which the insulating layer 4b is arranged between the first conductive layer 4a and the second conductive layer 4c of the capacitor 4, a change in capacitance may occur due to tensile deformation. Using this, pressure, strain, displacement, degree of deformation, etc. can be detected. For example, by attaching the capacitor 4 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. Moreover, the capacitor 4 is not limited to an elastic capacitor, and can also be used as wiring or the like for transmitting electrical signals such as heartbeat, pulse, and electrocardiogram.

The present invention also includes a biological information measurement garment including any one of the biological information measurement members described above. When the capacitor 4 is an elastic capacitor, undergarments for the lower half of the body include pants, sports innerwear, hospital clothes, nightwear, pants, underpants, patches, suteteko, skirts, spats, leggings, jersey undergarments, and swimwear undergarments. etc.

The base material fabric 2b is preferably at least part of the lower garment main body 2. As shown in FIG. As described above, the base fabric 2b is preferably a fabric that directly constitutes the biological information measurement garment, but may be a fabric that is layered on the lower garment main body 2 . That is, the base fabric 2b may be a fabric such as a piece of cloth different from that of the lower garment main body 2. By sewing the laminate to the fabric such as a cloth and attaching it to the lower garment main body 2, the living body can be formed. Information measurement garments may be made.

In the case where the capacitor 4 is a wire or the like that transmits an electric signal, the lower garment main body 2 may be one that covers at least part of the legs and abdomen. The lower garment main body 2 may be a belt-like object or underwear.

It is preferable that the capacitor 4 is provided in the lower garment main body 2 so as to be positioned at least partly of the wearer's abdomen and joints. The lower garment main body 2 may have a plurality of capacitors 4 .

REFERENCE SIGNS LIST 1 lower garment 2 lower garment main body 2a furring opening 2b base fabric 2c belt-like elastic fabric 3 elastic sensor 4 capacitor 4a first conductive layer 4b insulating layer 4c second conductive layer 4aA one end of the first conductive layer 4cA second conductive layer One end of layer 5 Protective film 5a Extension 6a First electrode member 6c Second electrode member 7 Cushion pad 8 Band-like stretchable interlining 15 Underlying film W Width of capacitor

Claims (8)

A lower garment capable of measuring the respiratory state of the wearer,
a lower garment body in which the furring opening is positioned higher than the navel of the wearer;
a stretch sensor extending in the waist circumference direction at or above the navel of the wearer. 2. A lower garment according to claim 1, comprising a base fabric extending in a waist circumference direction, said stretch sensor being fixed to the outside of said base fabric. The belt-like stretchable fabric is connected to the base fabric and extends in the direction around the waist, and nanofiber fibers are formed on the wearer's side of the belt-like stretchable fabric. 3. The lower garment according to claim 2, wherein no nanofiber fibers are formed on the wearer side of the fabric. The stretch sensor includes at least one capacitor extending in the waist circumference direction, a first electrode member provided on one end side of the extending direction of the capacitor, the first electrode member and the base material. and a protective film covering the capacitor. 4. The protective film according to any one of claims 1 to 3, wherein an extending portion extending distally in the circumferential direction is formed, and the protective film and the base fabric are sewn together at the extending portion. 's underwear. 5. The lower garment according to claim 4, wherein the length of the extending portion in the waist circumferential direction is longer than the width of the condenser. 6. The lower garment according to claim 4 or 5, wherein the peripheral portion of said protective film is sewn to said base fabric. The expansion/contraction sensor further has a second electrode member provided on the one end side in the extending direction of the capacitor, and the cushion pad comprises the first electrode member, the second electrode member, and the base material. 7. The lower garment according to any one of claims 4 to 6, wherein the rigidity of the cushion pad is higher than that of the base material. Claims 4 to 7, wherein when the base material is placed in a natural state, the width of the undulations in the thickness direction of the capacitor formed on the base material is larger than the width of the undulations in the thickness direction of the base material. An undergarment according to any one of the paragraphs.

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