JP7227593B2 - Stretchable elastic sheet and stretchable conductive wiring module having the same - Google Patents

Description

The present invention provides an elastic sheet that exhibits unique stretch characteristics accompanied by three-dimensional deformation by applying and releasing tensile stress in the stretching direction, can be stretched and restored, and is difficult to break, and wearable devices, flexible substrates, etc. using the elastic sheet. The present invention relates to a stretchable conductive wiring module that serves as a wiring component of a flexible device.

Electronic devices used to have electronic components such as IC chips mounted on a hard silicon substrate, glass substrate, or the like, with wiring attached thereto. Recently, electronic devices such as wearable devices, medical devices, physical ability measuring devices, and movable devices of industrial robots are used as flexible electronic components having flexible wiring materials, wiring substrates, etc. that can follow the movement of living bodies. It's starting to look like this.

Therefore, electronic devices are required to be lightweight, thin, and compact. is required.

Such flexibility of electronic devices in the field of electronics has attracted a great deal of attention due to the rise of wearable devices and the like, and various manufacturers have developed stretchable wiring using conductive fibers. For example, in Patent Document 1, a sheet-shaped body having a fiber structure is formed from material fibers having a non-conductive yarn whose surface is non-conductive and a conductive film formed on the surface of the non-conductive yarn. An anisotropically conductive fabric is disclosed.

In addition, sheet-like flexible substrates have been developed that are much lighter, thinner, and smaller than bulky wiring devices such as curled cords. For example, Patent Document 2 discloses a stretchable flexible substrate comprising an insulating base material and wiring provided on the insulating base material, wherein the insulating base material has a plurality of surface-bonded joints. Disclosed is a stretchable flexible substrate, shown in a honeycomb structure, consisting of a plurality of substrates, with openings formed between the joints.

Furthermore, Patent Document 3 focuses on the stretchability of the kirigami structure, and discloses a force sensor having a sheet having cuts of the kirigami structure formed alternately and holding means for holding a measurement target. ing.

Non-Patent Document 1 also discloses a sheet having sufficient stretchability by slit processing in which horizontal slit groups of rubber are arranged while being shifted in the vertical direction.

It can express high elongation rate and low stress with a simpler structure than conventionally known anisotropic conductive fabrics and elastic flexible substrates of honeycomb structure, and has sufficient flexibility, excellent resilience and robustness. An elastic sheet has been desired. In addition, in the kirigami structure cutting sheet, in which the same kirigami structure unit is simply repeated, the cut part is fragile, so when stretching, the tip of the cutting becomes the starting point and is easily broken at random. There has been a demand for an elastic sheet that is difficult to break and whose breakage can be controlled. Furthermore, by making this elastic sheet conductive, it exhibits high conductivity and high insulation to the outside as a wiring component of a flexible device, high extensibility, low stress, sufficient flexibility, and excellent resilience. There is a need for a stretchable conductive wiring module that exhibits both strength and robustness.

JP 2017-128827 A JP 2015-198101 A WO2017/179716

Ruike Zhao et al., Kirigami enhances film adhesion, Soft Matter (2018). DOI: 10.1039/C7SM02338C

The present invention has been made in order to solve the above-mentioned problems. To provide a stretchable elastic sheet having excellent resilience, resistance to repeated expansion and contraction and toughness that does not cause reduction in stretchability, resistance to breakage during elongation, and excellent durability. do. Furthermore, by using the stretchable elastic sheet, it has high conductivity inside and high insulation to the outside, and has high extensibility, low stress, sufficient flexibility, excellent resilience and robustness. It is an object of the present invention to provide an expandable conductive wiring module which shows the following.

A stretchable elastic sheet made to achieve the above object comprises: a plurality of through slits and/or a plurality of through holes arranged in series and/or in parallel while intersecting the longitudinal direction of a rectangular rubber elastic sheet piece; a row of peripheral edge connecting portions formed by a plurality of peripheral edge connecting portions connecting between the through slits and/or the through holes and the long sides of the rubber elastic sheet pieces; and the plurality of through slits and/or the plurality of through holes. and a plurality of cut slits and/or a plurality of cut holes cut facing inward from both of the long sides of the rubber elastic sheet pieces, and the cut slits and/or cut holes facing each other. Alternatively, a stretchable elastic sheet having a row of connecting portions between cuts consisting of a plurality of connecting portions between cuts connected between the cut holes, wherein the stretchable elastic sheet is perpendicular to the longitudinal direction, which is the longitudinal direction In the horizontal direction, at least one of the peripheral edge connecting portion row and the inter-cut connecting portion row in the middle of these rows has a width equal to that of the row end. It is characterized by being shorter than the lateral width of the peripheral connecting portion and/or the inter-cut connecting portion.

In this stretchable elastic sheet, for example, among the row of peripheral edge connecting parts and the row of connecting parts between cuts, the lateral width of the peripheral edge connecting part and/or the connecting part between notches increases in order toward the middle of these rows. It means that it is getting shorter.

In this stretchable elastic sheet, the width of the shortest peripheral edge connecting portion and/or the inter-cut connecting portion among the row of peripheral edge connecting portions and the row of inter-cut connecting portions is equal to the width of the rubber elastic sheet piece. It is preferably 1/50 to 1/2 of the width of the .

In the stretchable elastic sheet, among the row of peripheral edge connecting parts and the row of inter-cut connecting parts, the width of the peripheral edge connecting part and/or the width of the inter-cut connecting part, which is the shortest, is at least 0.5 mm. It may be 1 mm.

In this stretchable elastic sheet, the through slit or the cut slit has a through hole at each end, and/or the through hole or the cut hole is rounded at each corner. It may be.

In this stretchable elastic sheet, the rubber elastic sheet pieces are made of silicone rubber, silicone resin, polyurethane, plastic elastomer, ethylene-propylene rubber, ethylene-propylene-diene-methylene rubber, fluororubber, and / Or a thing made from natural rubber is mentioned.

This stretchable elastic sheet includes a flexible conductive base material having a conductive layer, and a plurality of punched holes pierced by punched slits and/or punched holes arranged in series and/or parallel along the direction of current flow of the conductive layer. The conductive substrate is sealed and covered without exposing at least a portion of the conductive base material by the rubber elastic sheet piece, and is composed of a plurality of the crosslinked necks. Among the rows of bridge necks, the width of at least one of the bridge necks in the middle of the row is shorter than the width of the bridge necks at the ends of the row, and the insulating rubber elastic sheet piece is positioned at the punched peripheral edge portion. In addition, the through slits and/or the through holes that are smaller than the through holes and the through slits penetrate through, and the conductive base material has a through gap between each of the plurality of punched peripheral edge portions. , The rubber elastic sheet piece may be penetrated by the cut slit and/or the cut hole smaller than the cut-out gap in accordance with the cut-out gap.

In the stretchable elastic sheet, it is preferable that the width of the cross-linked necks in the cross-linked neck row gradually decreases toward the middle of the row.

The stretchable elastic sheet covers, for example, at least the punched peripheral portion, and both surfaces of the conductive base material are sealed and covered with the rubber elastic sheet pieces.

In this stretchable elastic sheet, one or a plurality of the conductive base materials may be provided along the longitudinal direction.

In this stretchable elastic sheet, the punched peripheral edge portion may be thicker on the long side than on the inner side.

In this stretchable elastic sheet, the conductive substrate may have the conductive layer on a flexible support.

In this stretchable elastic sheet, for example, the conductive layer is a metal film layer, an organic conductive film layer, and/or a conductive inorganic material-containing conductive film layer.

In this stretchable elastic sheet, the extraction slit has a through hole at each end, and/or the extraction hole, the extraction gap, the extraction peripheral edge portion , and the bridging neck. At least some may be rounded at their respective corners.

In this stretchable elastic sheet, the conductive substrate may have electrical connectors at the ends of the conductive layer.

The stretchable elastic sheet may be characterized in that the rubber elastic sheet pieces are made of conductive rubber.

The stretchable elastic sheet may be such that the rubber elastic sheet piece has an electrical connector at its end.

A stretchable conductive wiring module designed to achieve the above object is characterized by having a single or a plurality of stretchable elastic sheets.

In this stretchable conductive wiring module, for example, a plurality of stretchable elastic sheets are overlapped and integrated.

In this elastic conductive wiring module, it is preferable that each of the plurality of conductive substrates has a separate terminal as a terminal, and the terminal is connected to an external terminal.

In this stretchable conductive wiring module, for example, a plurality of the conductive substrates serve as a pair or a plurality of pairs of electrodes.

The stretchable elastic sheet of the present invention has through slits, through holes, cut slits, and cut holes, so that when a tensile stress is applied in the stretching direction, the stretchable elastic sheet opens and stretches and pulls along with three-dimensional deformation. Upon stress release they develop peculiar stretching properties with contraction closing. This stretchable elastic sheet has excellent resilience and robustness such that it quickly recovers to its original shape before being stretched after tensile stress is released, even if it is repeatedly stretched and stretched. Therefore, this stretchable elastic sheet suppresses permanent deformation due to expansion and contraction due to the elastic properties and shape properties of the rubber elastic sheet pieces, and has high durability. This stretchable elastic sheet exerts a very small tensile stress, especially in a low stretch region, during stretch motion, has unique mechanical properties, and is easy to use in a practical area.

In addition, the so-called kirigami sheet, which has a monotonous kirigami structure repeatedly, tends to concentrate tensile stress on the peripheral edge connection portion and the connection portion between the cuts during elongation, so that the weakest points at the end of the row and the middle of the row are unexpectedly damaged. Easy to break. On the other hand, in this stretchable elastic sheet, the width of the peripheral edge connecting portion and the connecting portion between the cuts is shorter at the middle of the row than at the end of the row. It suppresses the expansion and contraction of the wiring end, which is most prone to disconnection, making it difficult to break.

This stretchable elastic sheet is made by sealing and covering a flexible conductive base material having a conductive layer and having through holes and through slits with a rubber elastic sheet piece having through slits and through holes. , the conductive base material can be expanded and contracted. Such a stretchable elastic sheet has a plurality of punch holes and slits in the conductive base material, so that even if the conductive base material is deformed by elongation in response to tension and restoration in response to subsequent release, the conductive layer remains intact. can follow, and has excellent durability as a conductive wiring. Moreover, the stretchable elastic sheet does not change the path length of the conductive layer in the conductive substrate when stretched, and the resistance value hardly changes when stretched. Therefore, it is extremely excellent as a wiring material.

In order to maintain stretchability and insulation, this stretchable elastic sheet is made of silicone rubber, silicone resin, polyurethane, plastic elastomer, ethylenepropylene rubber, ethylene-propylene-diene-methylene rubber, fluororubber, or natural rubber. When the conductive base material is sealed with an insulating elastic material such as the above, the stretchability and insulation properties can be maintained as they were at the beginning even after repeated expansion and contraction. When the terminals of the elastic elastic sheet are connected to an external device or an object to be measured, the terminals are not exposed except for the terminals. It is useful as a stretchable conductive wiring material that prevents reception of noise in biosignal detection.

This stretchable elastic sheet is even better than only a thin conductive layer when the flexible conductive substrate has a conductive layer on a flexible support and is sealed with a rubber elastic sheet piece. It exhibits resilience and can quickly recover to its original shape before stretching when tensile stress is released after stretching. In contrast to conventional conductive materials that develop stretchability through the expansion and contraction of the material, this stretchable elastic sheet has only through slits, through holes, cut slits, and cut holes, unlike the stretchiness derived from the physical properties of the material. Due to the three-dimensional structural change due to the punched slits and punched holes, it is possible to perform sealing with a rubber elastic sheet piece having a shape that does not hinder conductivity and flexibility. As a result, the mechanical properties during deformation are not limited to the rubber elastic sheet piece, but also the properties derived from the three-dimensional change of the three-dimensional structure before and after deformation, and it is possible to realize a low resistance value and a high elongation rate due to low stress. can.

Instead of having a conductive base material, this stretchable elastic sheet can be made into a wiring material that is simple and excellent in stretchability because the rubber elastic sheet piece itself is made of conductive rubber and has conductivity. be.

Using this stretchable elastic sheet, it is flexible and has excellent stretchability, and can be made lighter, thinner, and smaller, and has high conductivity inside and high insulation to the outside. It is possible to obtain a stretchable conductive wiring module that exhibits sufficient stretchability, does not cause deterioration in stretchability due to repeated stretching, and has excellent durability.

These stretchable elastic sheets and stretchable conductive wiring modules using the same are provided with through-slits or through-holes in the rubber-elastic sheet pieces and cut slits or a plurality of cut holes arranged alternately. Then, the stripped slits and holes and the stripped gaps of the conductive base material are arranged alternately, and the connecting parts between the cuts that are shortened in the middle of the rows, the peripheral connecting parts, and the bridging necks make it the most when stretched. It suppresses the expansion and contraction of the wiring end, which is prone to disconnection, making it difficult to break. By having such a structure, while having excellent resilience after repeated expansion and contraction that cannot be possessed by a simple rubber elastic sheet or elastic fiber without breaks, the surface can be sufficiently deformed with an extremely small deformation stress. Alternatively, it can be applied as an elastic wiring having excellent durability, toughness, low resistance value, and high elasticity by providing an internal conductive base material.

This stretchable conductive wiring module, which uses this stretchable elastic sheet as a stretchable conductive wiring material, undergoes specific deformation due to its three-dimensional structure, especially in the low stretch region, due to extremely small tensile stress. It can be implemented for flexible devices such as flexible substrates.

This stretchable conductive wiring module is used for ultra-thin skin contact electrodes, flexible substrates,
It is useful as an elastic wiring member suitable for wiring members for robots and the like.

Since the stretchable conductive wiring module stretches sufficiently even if the tensile stress is extremely small in the low stretch region, the wearer does not feel uncomfortable when using it as a wearable device.

1 is a plan view showing a state of use of a stretchable elastic sheet to which the present invention is applied; FIG. FIG. 10 is a plan view showing the state of use of another stretchable elastic sheet to which the present invention is applied; FIG. 3 is a schematic perspective view showing an exploded state of another stretchable elastic sheet to which the present invention is applied. FIG. 4 is a plan view showing a conductive base material and rubber elastic sheet pieces in a stretchable elastic sheet of another embodiment to which the present invention is applied; FIG. 10 is a plan view showing the state of use of another stretchable elastic sheet to which the present invention is applied; FIG. 3 is a diagram showing the correlation between the stretch rate and the tensile stress of a stretchable elastic sheet to which the present invention is applied and a sheet to which the present invention is not applied. FIG. 4 is a diagram showing the positional relationship of the fracture locations when the stretchable elastic sheet to which the present invention is applied and the sheet to which the present invention is not applied are pulled until they are torn.

Modes for carrying out the present invention will be described in detail below, but the scope of the present invention is not limited to these modes.

A first preferred form of the stretchable elastic sheet 1 of the present invention consists of a long rectangular rubber elastic sheet piece 10, as explained with reference to FIG.

The rubber elastic sheet piece 10 has a long side 10a along the longitudinal direction A and a short side 10b perpendicular thereto. The rubber elastic sheet piece 10 has a plurality of through slits 13a . A plurality of cut slits 12a . have. At least one of the cut slits 12a to 12f is cut toward the center, preferably the cut slits 12c and 12d near the center are cut longer. At least one of the through slits 13a to 13e is cut toward the center, preferably the closer it is to the center through slit 13c.

The through slits 13a . . . 13e and the cut slits 12a . Peripheral connecting portions 15a . . . 15e _connected between the through slits 13a . Inter-notch connecting portions 14a . . . 14f connected between the mutually facing notch slits _12a .

_14e and/or the peripheral edge connecting portion _15b . . . The lateral width of 15d is shorter than the lateral widths of the notch connecting portions 14a and 14f and the peripheral edge connecting portions 15a and 15e at the ends of the rows. Preferably, the widths of the rows become shorter in the middle of the row, that is, closer to the central notch connecting portions 14c and 14d and the central peripheral edge connecting portion 15c. In FIG. 1, an example in which the width of the inter-notch connecting portion row 14 _line gradually decreases toward the middle of the row is shown in a somewhat exaggerated manner.

For example, among the inter-cut connecting portion row 14 _line and the peripheral edge connecting portion row 15 _line , the widths of the inter-notch connecting portions 14 b . . . 14 e and the peripheral edge connecting portions 15 b . The widths of the notch connection portions 14a and 14f and the peripheral edge connection portions 15a and 15e at the row ends are successively shortened by 0.1 mm to 3 mm or by 1% to 30%.

The width of the shortest peripheral edge connecting portion 15c and the notch connecting portion 14d is preferably 1/50 to 1/2 of the width of the rubber elastic sheet piece 10, that is, the length of the short side 10b. If it is below this range, it will be too fragile and will break when stretched. It is more preferably 1/10 to 1/3. The width of the shortest peripheral edge connecting portion 15c and/or the width of the shortest inter-cut connecting portion 14d is preferably 0.1 mm or more. If it falls below this range, it will be too brittle and will easily break when stretched. More preferably, it is 0.3 mm or more.

The stretchable elastic sheet 1 is made of silicone rubber, silicone resin, fluororubber, ethylene-propylene-diene-methylene rubber, and/or natural rubber, and is insulating, flexible and conductive. It does not have a base material and is used for medical supporters and reinforcing/protecting materials for flexible devices.

The stretchable elastic sheet 1 may be made of a conductive rubber, for example, an elastic rubber containing conductive particles such as a conductive material such as carbon paste, or an elastic rubber cured with a conductive rubber curing component. good. The surface may be covered with a protective sheet.

This stretchable elastic sheet 1 operates as follows.

The stretchable elastic sheet 1 is initially substantially flat. When the stretchable elastic sheet 1 is pulled along the longitudinal direction A with a relatively weak tensile stress so that the end portions 11a and 11b are separated, the cut slits 12a . . . 12f and the through slits 13a. . . . 13e are slightly twisted and opened while tilting, and the shape changes from (a) to (b) shown in FIG. In the inter-notch connecting portion row 14 _line , the widths of the inter-notch connecting portions 14a . . . The inter-notch connecting portions 14a . . . 14f are easier to open toward the center of the inter-notch connecting portion row 14 _line , in which the width is narrower, and are more difficult to open toward the end of the row. Therefore, the cut slits 12a . . . 12f and the through slits 13a . In this manner, the stretchable elastic sheet 1 is sufficiently stretched even with a low tensile stress.

When the cut slits 12a...12f and the through slits 13a...13e are opened, they are twisted unevenly and deformed into a substantially rhombic shape or a substantially polygonal shape, thereby contributing to elongation. On the other hand, the inter-notch connecting portions 14b . . . 14e have a shorter width in the middle. It prevents it from breaking.

As a result, the stretchable elastic sheet 1 can be freely stretched with a slight tensile stress unless the inter-cut connecting portions 14b . . . 14e are pulled so strongly as to tear them.

Thereafter, when the stretchable elastic sheet 1 stops being pulled and releases the tensile stress, it returns to its original shape according to the elastic force of the rubber elastic sheet piece, as shown in FIG. 1(a). , 12f and through slits 13a . In this manner, the stretchable elastic sheet 1 is restored to its original shape before being stretched.

This stretchable elastic sheet 1 only deforms the shapes of the cut slits 12a . . . 12f and the through slits 13a . Especially in the low elongation region, very little stress change occurs. Moreover, the stretchable elastic sheet 1 does not cause permanent deformation or breakage even after being repeatedly stretched, and has excellent robustness and durability.

A second preferred form of the stretchable elastic sheet 1 of the present invention, described with reference to FIGS. 2 and 3, is a flexible flat sheet having a flexible conductive layer 20A and a flexible support 20B. It has a conductive substrate 20 and flat rectangular insulating rubber elastic sheet pieces 10 and 30 sandwiching it. The rubber elastic sheet pieces 10 and 30 are as shown as the stretchable elastic sheet 1 in FIG.

In the conductive base material 20, the flexible support 20B made of an insulating resin and the conductive layer 20A, which is a metal layer applied thereon, have the same shape. The conductive base material 20 is in the form of a sheet strip elongated in the conducting direction of the conductive layer 20A (that is, the longitudinal direction A).

The conductive base material 20 is arranged in series along the longitudinal direction A at equal intervals with a plurality of rectangular punched holes 27a to 27e penetrating therethrough. The through holes 27a . . Outer edges of the punched holes 27a . . . 27e form a plurality of punched peripheral edge portions 28a . The conductive base material 20 has punched gaps 26a...26f between adjacent punched peripheral parts 28a...28e and on the short side 10b side of both ends thereof.

Adjacent punched peripheral edge portions 28a . . . 28e are connected to each other by bridging necks 25a . The bridging necks 25a...25f, like the punched peripheral edge portions 28a...28e, form a part of the conductive layer 20A and the flexible support 20B, so that they are electrically conductive in the conductive layer 20A. there is The bridging necks 25a . . . 25f form a bridging neck row 25 _line .

Of the bridge neck row 25 _line , the width of at least one bridge neck 25b . Preferably, in the middle of these rows, that is, as they approach the central bridge neck 25c, their lateral widths decrease in increments of 0.1 mm to 3 mm, or in increments of 1% to 30%.

The width of the shortest bridging neck 25c is within the range where it can be completely covered with the rubber elastic sheet pieces 10, 30, and is slightly shorter than the range indicated by the notch connecting portion 14d by the margin. The width of the shortest bridge neck 25c is preferably a ratio of 1/120 to 1/3 of the width of the rubber elastic sheet piece 10, that is, the length of the short side 10b, or a width length of 0.1 mm to 4 mm. Below this range, the resistance becomes too large. On the other hand, if it exceeds this range, sufficient extensibility cannot be obtained. More preferably, the ratio is 1/60 to 1/5, or the width length is 0.2 mm to 2 mm.

The rubber elastic sheet pieces 10 and 30 have the same length as the conductive base material 20 in the longitudinal direction A, and are longer than the conductive base material 20 in the direction perpendicular to the longitudinal direction A so as to wrap the conductive base material 20. It is designed to have a margin. 28e are sealed and covered with rubber elastic sheet pieces 10 and 30 so as not to be exposed to the outside together with the bridge necks 25a . . . 25f.

Each of the rubber elastic sheet pieces 10, 30 has through slits 13a . . . which are smaller than the through holes 27a . 13e and 33a . . . 33e are penetrated respectively. 13e and 33a . . . 33e are smaller than the through holes 27a . The peripheral edge portions 28a, . ing.

In addition, each of the rubber elastic sheet pieces 10, 30 has cut slits 12a smaller than the gaps 26a . . . 26f aligned with the gaps 26a . . . . 12f and 32a . 12f and 32a . It is cut so as not to reach 25f. 12f and 32a . . . 32f are smaller than the gaps 26a . 28e and bridge necks 25b .・25e is not exposed to the outside world.

12f and through slits 13a . . . 13e of the rubber elastic sheet piece 10 and cut slits 32a . 33a . . . 33e pass through gaps 26a . They are overlapped and glued to each other at the margins there. As a result, the punched peripheral edge portions 28a . 1 is extendable.

The stretchable elastic sheet 1 is covered with insulating rubber elastic sheet pieces 10 and 30 on the front and back sides, so that the edge of the short side 10b is completely sealed. Although it may be covered so as not to be exposed, the edges of the ends 21a and 21b at both ends in the longitudinal direction A may be exposed so that they can be connected to an external device as necessary.

This stretchable elastic sheet 1 operates as follows.

The stretchable elastic sheet 1 is initially substantially flat due to the flat conductive substrate 20 and the flat rubber-elastic sheet pieces 10 and 30 . When the stretchable elastic sheet 1 is pulled along the longitudinal direction A with a relatively weak tensile stress so that the ends 11a, 21a, 31a and the ends 11b, 21b, 31b are pulled apart, the strain shown in FIG. The shape changes from a) to (b). In the inter-notch connecting portion row 14 _line and the bridge neck row 25 _line , the widths of the inter-notch connecting portions 14a . . . 14f and the bridge necks 25a . _14f and the bridging necks _25a . It becomes more difficult to open toward the end of the row. 12f and 32a . . . 32f and the through slits 13a . . . 13e and 33a . On the other hand, it twists and tilts slightly toward the end and stretches slightly. In this manner, the stretchable elastic sheet 1 is sufficiently stretched even with a low tensile stress.

During such uneven stretching, the short sides (parallel to the longitudinal direction A) of the punched peripheral edge portions 28a . . . , and the long sides (perpendicular to the longitudinal direction A) of the punched peripheral edge portions 28a . In addition, the cutting gap slits 12a...12f and 32a...32f are opened accordingly. 12f and 32a . Open while tilting with . Accordingly, the conductive base material 20 and the rubber elastic sheet pieces 10 and 30 adhered thereto are similarly twisted and elongated, and as a result, the stretchable elastic sheet 1 is elongated. At this time, the insides of the punched peripheral edge portions 28a . It contributes to elongation by deforming into a twisted approximately rhombic shape or approximately polygonal shape with . On the other hand, the bridging necks 25a . . . 25f cannot be extended or twisted, so they do not contribute to elongation, but rather prevent excessive or insufficient deformation of the drawn peripheral edge portions 28a . 14e and 34b . . . 34f and bridge necks 25b . Therefore, in actual use, the expansion and contraction of the wiring end, which is most likely to cause disconnection, is suppressed, and breakage is prevented.

As a result, the stretchable elastic sheet 1 can be freely stretched unless the conductive base material 20 is pulled too strongly, since the conductive base material 20 is relatively difficult to break even under tensile stress.

Thereafter, when the stretchable elastic sheet 1 stops being pulled and releases the tensile stress, as shown in FIG. Backwards, the stripped peripheral edge portions 28a...28e and the cut slits 12a...12f and 32a...32f close with a reduced tilt while eliminating twisting. At this time, the short side portions of the punched peripheral edge portions 28a . 12f and 32a . . . 32f are released from the tensile stress, and along with this, they are deformed again so that their bending or bending returns to its original state. Accordingly, the stretchable elastic sheet 1 shrinks to its original shape while the twisting and tilting of the conductive base material 20 and the rubber elastic sheet pieces 10 and 30 are eliminated. At this time, the inside of the blanked peripheral edge portions 28a...28e and the gap slits 12a...12f and 32a...32f contribute to closing and shrinking along the longitudinal direction A. As shown in FIG. On the other hand, since the bridging necks 25a...25f do not shrink, they do not contribute to the expansion and contraction, but rather assist the recovery of the original shape of the stripped peripheral edge portions 28a...28e. In this manner, the stretchable elastic sheet 1 is restored to its original shape before being stretched.

12f and 32a . . . 32f and through slits 13a . . . 13e and 33a . , 27e of the conductive base material 20, and by sealing the conductive base material 20 with the rubber elastic sheet pieces 10 and 30, the tensile stress applied to the expansion and contraction motion is reduced. Very small. In particular, very little stress change occurs in the low elongation region. Moreover, the stretchable elastic sheet 1 does not cause permanent deformation or breakage due to changes in the shape of the rubber elastic sheet pieces 10 and 30 and the conductive base material 20 even after repeated expansion and contraction, and is excellent in robustness and durability. Alternatively, the conductive base material 20 has excellent conductive properties with almost no change in the resistance value.

Since the stretchable elastic sheet 1 is firmly sealed with the rubber elastic sheet pieces 10 and 30 except for the edges of the ends of the conductive base material 20 that can serve as terminals, unexpected electric leakage or discharge does not occur. , excellent electrical properties.

The stretchable elastic sheet 1 includes through slits 13, through holes, cut slits 12, and cut holes of the rubber elastic sheet pieces 10 and 30, and if necessary, bridging necks 25, gaps 26, and cut slits/cuts. By having the hole 27 and the punched peripheral edge portion 28, the tensile stress at 50% elongation deformation can be 1 MPa or less, preferably 0.5 MPa or less, more preferably 0.3 MPa or less.

This stretchable elastic sheet 1 exhibits a shape change of 10% or less when 50% elongation deformation is repeated one million times, and is excellent in resilience and robustness.

Although the stretchable elastic sheet 1 has been described with the shape shown in FIGS. 1 to 3, the shape of each structure can take any shape.

The stretchable elastic sheet 1 does not have to be flat in the initial state, and may be curved, curved, or spiral.

In the stretchable elastic sheet 1, as shown in FIG. 4(a), the punched holes 27, the punched peripheral edge portions 28, and the bridging necks 25 of the conductive base material 20 may be rounded at the respective inner peripheral corners. The connection angle between the punched peripheral portion 28 and the bridging neck 25 may be rounded. Also, the through holes and cut holes (not shown) of the rubber elastic sheet pieces 10 and 30 may be rounded at corners.

As shown in FIG. 4(b), the stretchable elastic sheet 1 includes the extraction slit 27 (see FIG. 3) of the conductive base material 20, the through slits 13 and 33 of the rubber elastic sheet pieces 10 and 30, and the cut slit 12. 32 (see FIG. 3) may have a through hole 29 at the end.

In the stretchable elastic sheet 1, the shape of the punched peripheral edge portion 28 of the conductive base material 20 may be replaced with a rectangular shape, such as a square shape, a corner rectangular shape, a rhombic shape, a hexagonal shape, or an isosceles trapezoidal shape. It may have a polygonal shape, an elliptical shape, a warped diamond shape, a rounded rectangular shape, or a combination thereof. Together with the bridging neck 25, it may have a bellows shape or a zigzag shape.

For example, as shown in FIG. 5, when the punched peripheral edge portion 28 of the conductive base material 20 is formed into a bellows shape, the conductive base material 20 is provided with a punched hole 27 between the end portion 21a and the end portion 21b. A punched peripheral portion 28 formed around the perimeter by punching and a curved bridging neck 25 connecting the peripheral portion 28 and formed on the outside on the long side 10a side of the rubber elastic sheet piece 10 are repeatedly formed. A blanking gap 26 is formed between the blanking peripheral portion 28 and the bridging neck 25 that are adjacent to each other. As in FIGS. 1 to 3, it is sealed and covered with insulating rubber elastic sheet pieces 10 and 30. FIG. The rubber elastic sheet pieces 10 and 30 which are rolled up to match the outer periphery of the curved bridge neck 25 pierce through a through slit 13 smaller than the punch hole 27 so as to match the punched peripheral edge portion 28 . The rubber elastic sheet pieces 10 and 30 are penetrated by a slit 12 smaller than the gap 26 so as to match the gap 26. - 特許庁Among the rows of the bridge necks 25, the width of the bridge necks 25 gradually decreases toward the middle of the row. Along with this, among the rows of peripheral edge connecting portions formed by a plurality of peripheral edge connecting portions 15 connected between the through slits 13 of the rubber elastic sheet pieces 10 and 30 and the long sides 10a of the rubber elastic sheet pieces 10 and 30, The lateral width of the peripheral connecting portion 15 becomes shorter as the distance increases. The conductive substrates 20 are paired symmetrically.

In yet another embodiment of the stretchable elastic sheet 1, the punched holes 27 of the conductive base material 20 may be thick and long, and the through slits 13 and 33 of the rubber elastic sheet pieces 10 and 30 may be thin and short. You can also make a narrow and short slit. The through hole 27 of the conductive base material 20 may be a thick and long slit, and the through slits 13 and 33 of the rubber elastic sheet pieces 10 and 30 may be thin and short slits.

In yet another embodiment of the stretchable elastic sheet 1, the conductive base material 20 has a conductive layer 20A which is a metal layer attached to a portion of the top of a flexible support 20B made of an insulating resin. can be anything.

Still another aspect of the stretchable elastic sheet 1 may be symmetrical or asymmetrical.

The stretchable elastic sheet 1 has a conductive layer so that the resistance value when the rubber elastic sheet pieces 10 and 30 are not covered is 1 kΩ at maximum, preferably 0.2 kΩ at maximum, more preferably 0.1 kΩ at maximum. It is preferable to appropriately select 20A or adjust the thickness of the conductive layer 20A. The stretchable elastic sheet 1 having such a resistance value can be adjusted by the conductive layer 20A which is uniform and has almost no cracks.

In the stretchable elastic sheet 1, if the conductive layer 20A in the conductive base material 20 is flexible and made of a conductive material, a metal film layer made of a metal such as copper, silver, or gold or an alloy, A conductive film layer containing a conductive inorganic substance such as a conductive layer film containing a carbon paste, an organic conductive film layer made of an organic conductor or an organic conductive ink, etc. can be arbitrarily selected. Among them, the conductive layer 20A is preferably made of copper, silver, or gold, which has low resistance and high elongation. The conductive layer 20A can be arbitrarily set to a thickness of 1 nm to 1 mm. If the thickness falls below this range, it becomes difficult to form the conductive layer 20A in a homogeneous layer, resulting in poor conductivity. On the other hand, when this range is exceeded, the thickness becomes too thick and it becomes difficult to maintain flexibility. The lower limit is more preferably 10 nm, and even more preferably 100 nm. The upper limit is more preferably 0.5 mm, and even more preferably 0.1 mm.

In conductive substrate 20, conductive layer 20A is attached to flexible support 20B by printing, etching, sputtering, lamination, or the like.

The stretchable elastic sheet 1 is made of a general-purpose plastic exemplified by polypropylene, polystyrene, and polyethylene terephthalate, provided that the flexible support 20B in the conductive base material 20 is flexible and elastic and made of an insulating material. , polycarbonate, polyacetal, engineered plastics exemplified by polyamide, polyimide, polyether ether ketone, polyphenylene sulfide made of super engineered plastics exemplified, among others, polyimide, polyethylene terephthalate, polycarbonate, polyphenylene It is preferably made of sulfide or the like. The flexible support 20B can be arbitrarily set to have a thickness of 1 μm to 1 mm. Below this range, it becomes difficult to maintain insulation and supportability. If this range is exceeded, it becomes difficult to maintain flexibility. The lower limit is more preferably 10 μm, and even more preferably 50 μm. The upper limit is more preferably 0.5 mm, and even more preferably 0.2 mm.

Without the flexible support 20B, the stretchable elastic sheet 1 lacks a restoring force and is difficult to stretch sufficiently with the rubber elastic sheet pieces 10 and 30 alone.

The stretchable elastic sheet 1 is made of silicone such as polydimethylsiloxane, polydiphenylpolysiloxane, or polyfluorosiloxane, provided that the rubber elastic sheet pieces 10 and 30 are made of an insulating material and are flexible and coatable. Polyurethane such as resin, silicone rubber, soft polyurethane, hard polyurethane, plastic elastomer such as polystyrene, ethylene propylene rubber such as ethylene propylene diene rubber, vinylidene fluoride, tetrafluoroethylene-propylene, tetrafluoro A material made of fluororubber such as ethylene-purple vinyl ether, a material made of natural rubber, or the like can be arbitrarily selected, but silicone rubber and silicone resin, which are excellent in insulating properties and workability, are more preferable. The rubber elastic sheet pieces 10 and 30 can be arbitrarily set to a thickness of 10 μm to 10 mm. Below this range, it becomes difficult to maintain durability and insulation. If the range is exceeded, it becomes difficult to maintain flexibility, or it becomes difficult to stretch unless it is pulled forcibly, resulting in poor stretchability. The lower limit is preferably 10 μm, more preferably 20 μm. The upper limit is preferably 5 mm, more preferably 1 mm, and even more preferably 200 μm.

In the stretchable elastic sheet 1, the hardness of the rubber elastic sheet pieces 10 and 30 can be arbitrarily selected within the range of 10 to 90 in Shore A hardness. Among them, it is more preferable that the Shore A hardness is 10 to 50 because of good strength and elongation.

In the stretchable elastic sheet 1, in the conductive base material 20, punched peripheral portions 28 penetrated by punched holes 27 and punched slits are connected by crosslinked necks 25 with punched gaps 26 left therebetween, and arranged in a line in the longitudinal direction. However, a plurality of rows of them are arranged in parallel, and through slits smaller than the punch holes 27 and the punch slits are formed in the rubber elastic sheet pieces 10 and 30 in accordance with the positions of the punch holes 27 and the punch slits and the punch gaps 26. 13 and 33 and gap slits 12 and 32 smaller than the extraction gap 26 may pass through.

In the stretchable elastic sheet 1, the conductive base material 20 and the rubber elastic sheet pieces 10 and 30 may be adhered with an adhesive, heat-sealed, or chemically bonded. , may be integrally molded.

The stretchable elastic sheet 1 is provided with an electrical connector, such as a ring snap terminal for connection with an external device, at the end 21 of the conductive layer 20A sealed with the ends 11a and 11b of the rubber elastic sheet pieces 10 and 30. , may have cable clamp terminals.

The stretchable elastic sheet 1 may serve as a terminal by exposing the other end 21b of the conductive layer 20A from at least one of the ends 11b and 31b of the rubber elastic sheet pieces 10 and 30. FIG. Alternatively, the end portion 21b may be bifurcated.

The stretchable elastic sheet 1 consists of the conductive base material 20 and the rubber elastic sheet pieces 10 and 30 which are sealed and covered without exposing the cut-out peripheral edge portion 28 and the bridge neck 25 of the conductive base material 20 while sandwiching it. By doing so, it is the minimum unit of three layers. A multilayer structure in which a plurality of minimum units are stacked may be used.

The stretchable elastic sheet 1 may have a multi-layered structure in which rubber elastic sheet pieces 10 and conductive substrates 20 are alternately stacked and sealed with 30 for covering.

The stretchable elastic sheet 1 can be used as one of a pair of electrodes for detecting biosignals.

In the stretchable elastic sheet 1, the conductive base material 20 and the ends 21a and 21b on one longitudinal end side of the rubber elastic sheet pieces 10 and 30 on one longitudinal end sides and the ends 11a and 21b and 21a. 11b may be completely sealed and covered so as not to be exposed. The conductive layer 20A is connected to an electrical connector for connecting to an external device at an end 21a or 21b.

A stretchable conductive wiring module can be formed by stacking and integrating a plurality of stretchable elastic sheets 1 . When a plurality of stretchable elastic sheets 1 are stacked, the rubber elastic sheet piece 30 in the lower layer of the upper stretchable elastic sheet and the rubber elastic sheet piece 10 in the upper layer of the lower stretchable elastic sheet are used in common. good too. By doing so, the stretchable elastic sheet 1 is formed into a five-layer structure consisting of a rubber elastic sheet piece, a conductive substrate, a rubber elastic sheet piece, a conductive substrate, and a rubber elastic sheet piece, and is paired by two conductive substrates. Alternatively, a rubber elastic sheet piece, a conductive base material, and so on may be stacked in this order to form a nine-layer structure, and two pairs of electrodes may be formed by four conductive base materials. A plurality of stretchable elastic sheets may be overlapped and integrated.

In the stretchable conductive wiring module, each of the plurality of stretchable elastic sheets may have a terminal at its terminal, and the terminal may be connected to an external terminal.

With such a stretchable elastic sheet 1 and a stretchable conductive wiring module using the same, even if the sealing portion is immersed in an electrolyte solution, the electrolyte does not seep into the conductive substrate 20 and does not seep out.

Such a stretchable elastic sheet 1 and a stretchable conductive wiring module can detect signals from 1 Hz to 100 kHz. Since biomedical signals are usually several Hz to several kHz, especially around 100 Hz in the case of myoelectric signals, this stretchable elastic sheet 1 and stretchable conductive wiring module can be sufficiently detected.

The stretchable elastic sheet 1 and the stretchable conductive wiring module are manufactured, for example, as follows.

First, the conductive base material 20 is produced. The conductive base material 20 is made by preparing Cu sputtered polyimide by spattering a copper film on a polyimide film, and then punching out as shown in FIGS. 27 , a blanking gap 26 therebetween, a blanking peripheral portion 28 inevitably formed by them, and a bridging neck 25 connecting the blanking holes 27 are formed to obtain the conductive substrate 20 .

Next, the rubber elastic sheet pieces 10 and 30 are produced. The silicone rubber sheet is cut to be larger than the outer shape of the conductive base material 20 by the margin, and through slits 13 and 33 smaller than the punched holes 27 are formed in accordance with the positions of the punched holes 27 in the punched peripheral edge part 28, The rubber elastic sheet pieces 10 and 30 are obtained by cutting gap slits 12 and 32 smaller than the blanking gap 26 in accordance with the position of the blanking gap 26 between the blanking peripheral parts 28. - 特許庁

Finally, the punched hole 27 and the through slits 13 and 33 are aligned, and while the punched gap 26 and the gap slits 12 and 32 are aligned, they are sealed and adhered so as to wrap the punched peripheral portion 28 with a glue margin. The stretchable elastic sheet 1 is obtained by overlapping the conductive base material 20 and the rubber elastic sheet pieces 10 and 30 so as to cover them and joining them with an adhesive.

As the conductive base material 20, instead of using Cu sputtered polyimide, a flexible support with a copper film attached may be etched. A conductive ink containing carbon paste is applied to the flexible support having the punched gaps 26, the punched holes 27, and the crosslinked necks 25 to form a conductive film layer containing a conductive inorganic substance, such as a conductive ink layer film, Organic conductive ink may be applied to form an organic conductive film layer.

As another manufacturing method, rubber elastic sheet pieces 10 and 30, which are silicone rubber sheet small pieces larger by the amount of the glue margin, are attached to the conductive base material 20 in which the punched holes 27, the punched gaps 26, and the crosslinked necks 25 are formed, and then punched. Through slits 13, 33 smaller than the punched holes 27 in accordance with the positions of the punched holes 27 in the peripheral edge parts 28, and gap slits 12 smaller than the punched gaps 26 in accordance with the positions of the punched gaps 26 between the punched peripheral edge parts 28. · 32 may be cut to obtain the stretchable elastic sheet 1 .

As another manufacturing method, a silicone rubber sheet small piece to be the rubber elastic sheet piece 10 or 30 is pasted with an adhesive to one side of the conductive base material 20 in which the punched holes 27, the punched gaps 26, and the crosslinked necks 25 are formed. Then, the other side of the conductive base material 20 is coated, sprayed, or immersed with a cured resin component composition of silicone rubber to form the other rubber elastic sheet piece 30 or 10. The stretchable elastic sheet 1 can be obtained by cutting the through slits 13 and 33 in accordance with the positions of the punched holes 27 in the part 28 and the gap slits 12 and 32 in accordance with the positions of the punched gaps 26. good.

As another manufacturing method, both surfaces of the conductive substrate 20 having the punched holes 27, the punched gaps 26, and the crosslinked necks 25 formed thereon are coated, sprayed, or immersed with a cured resin component composition of silicone rubber to form rubber elastic sheet pieces. After forming 10 and 30 at once, through slits 13 and 33 are formed in accordance with the positions of the punched holes 27 in the punched peripheral portion 28, and the clearance slits 12 and 32 are formed in correspondence with the positions of the punched gaps 26 in the same manner as described above. , may be cut to obtain the stretchable elastic sheet 1 .

If necessary, the formation of the laminated structure of the stretchable elastic sheet 1 is repeated to form the stretchable conductive wiring module. The elastic conductive wiring module attaches an electrical connector to the end 21a of the conductive layer 20A as required. The electrical connector may be attached by soldering, or may be attached by screwing and crimping a ring snap terminal.

The stretchable conductive wiring module can be used as a detachable, disposable, and clean wearable device by stacking stretchable elastic sheets 1 in multiple layers and/or arranging them in series and/or in parallel. This stretchable conductive wiring module can be widely used for myoelectric potential measurement of small muscles such as facial muscles, palm muscles, and large leg muscles. The stretchable conductive wiring module can be used for myoelectric potential measurement at various parts of the living muscle and three-dimensional myoelectric potential measurement by forming one to four pairs of 2 to 8 electrodes as a pair of both electrodes.

The stretchable conductive wiring module is used to measure myoelectric potential in rehabilitation to check the state of recovery, to check the progression of a muscle disease called myopathy, and to check the athletic performance of athletes. In addition, it can be used to accurately measure myoelectric potential by following the movement of muscles, such as recording the movements of craftsmen as changes in myoelectric potential and leaving the craftsmanship as technical data for future generations.

This expandable conductive wiring module can selectively detect a desired electric potential without detecting unnecessary noise while maintaining insulation by arranging exposed terminals only at necessary locations and sealing other portions to maintain insulation. , can maintain electrical properties even after repeated expansion and contraction.

An example in which a stretchable elastic sheet to which the present invention is applied and a stretchable elastic sheet to which the present invention is not applied is prepared and their performances are compared will be shown below.

First, Example 1 to which the present invention is applied and the stretchable elastic sheet 1 composed only of the rubber elastic sheet piece 10 shown in FIG. 1 was produced, and Comparative Examples 1 and 2 to which the present invention was not applied. and compared their performance.

(Example 1)
After sheeting LSR2660 manufactured by Momentive Co., Ltd. as a silicone rubber raw material composition using a calender roll, the silicone rubber sheet formed by heat curing was cut to a thickness of 60 μm, and the long side 10a was 41 mm and the short side 10b was 12 mm. A raw material for elastic sheet was produced. As shown schematically in the number and width in FIG. 1, cuts consisting of six pairs of cut slits 12a . It has an inter-connection part row 14 _line and a peripheral edge connection part row 15 _line composed of five through slits 13a ... 13e and peripheral edge connection parts 15a ... 15e from one end to the long side 10a. , in the longitudinal direction A and its perpendicular direction. One slit of each pair of cut slits 12a and 12f closest to both short sides 10b is cut by 3 mm, and every time it shifts inward, one slit of each pair reaches the middle cut slit 12c. The slits are sequentially cut longer by 1 mm, and are spaced at intervals of 4 mm. As a result, the width of the inter-cut connecting portions 14a and 14f at the ends of the inter-cut connecting portion row 14 _line is 6 mm, and the width of the inter-cut connecting portions 14c and 14d at the center of the row is 2 mm. there is Through slits 13a are 3 mm, 13b are 4 mm, 13c are 5 mm, 13d are 4 mm, and 13e have widths of 3 mm at equal intervals in the middle of the interval between the inter-cut connecting portions 14a ... 14f of the inter-cut connecting portion row 14 _line . It is cut by and penetrates. . . 15e formed by the slit ends of the through slits 13a . is 4 mm, and 15e is 4.5 mm. This was used as a sample of the gradation-kirigami structure of Example 1.

(Comparative example 1)
A stretchable elastic sheet raw material having a thickness of 60 μm, a long side 10a of 41 mm, and a short side 10b of 12 mm, which was formed in the same manner as in Example 1, was used as it was as a non-kirigami structure sample of Comparative Example 1. .

(Comparative example 2)
Instead of applying a gradation to the width of the through slit 13 in the middle and the connecting portion 14 between cuts as in Example 1, the width of the through slit 13 in the middle and the connecting portion 14 between cuts was fixed at 4 mm. , was used as a non-gradation-kirigami structure sample of Comparative Example 2 in the same manner as in Example 1.

(Tensile test 1)
Each sample of Example 1 and Comparative Example 1 was pulled by a tensile tester at 10 mm/min to create a stress-strain curve until the sample was torn. The results are shown in FIG. 6 and Table 1.

As is clear from FIG. 6 and Table 1, the sample of Example 1, which has a gradation-Kirigami structure, compared to the samples of Comparative Example 1, which has a non-Kirigami structure, and Comparative Example 2, which has a non-gradation-Kirigami structure, It was found that the extension rate was greatly improved and the stress required for deformation was reduced.

Next, as shown in FIGS. 2 and 3 to which the present invention is applied, a conductive material obtained by copper sputtering on a polyimide film is processed into a shape having a plurality of opening structures, and is bonded with slit-processed silicone rubber for insulation sealing. Example 2, in which the stretchable elastic sheet 1 composed of the rubber elastic sheet pieces 10 and 30 and the conductive base material 20 was produced by performing , compared their performance.

(Example 2)
In order to schematically show the number and width, elastic elastic sheets 10 and 30 made of silicone rubber having a thickness of 30 μm and having a length of 42 mm and a short side of 12 mm were formed in the shape shown in FIGS. is. The stretchable elastic sheets 10 and 30 have cut slits 12a...12f and 32a...32f and penetration slits 13a...13e and 33a... 33e and connecting portions 14a, . . . , 14f, 34a, .
REMI-FS manufactured by Kitagawa Industries was used as the conductive base material 20 .
The conductive base material 20 has a minimum wiring width of 0.75 mm at the punched peripheral edge portion 28, a horizontal width of the punched hole 27 of 8 mm, and the punched gaps 26a . . . The width of the bridging necks 25a and _25f at the ends of the bridging neck row 25 line is reduced to 1.0 mm by hollowing the bridging necks 25a and 25f at the ends of the bridging neck row 25 line in the direction perpendicular to the longitudinal direction A with a gap length of 3 mm. 8 mm, and gradually decreases by 0.4 mm until reaching the bridge neck 25c in the middle.
The obtained conductive base material 20 and stretchable elastic sheets 10 and 30 are processed respectively, and then a silicone adhesive (trade name: Super X Gold; manufactured by Cemedine Co., Ltd.) is thinly applied to the conductive base material 20 to stretch it. It was sandwiched between elastic sheets 10 and 30 and adhered. The stretchable elastic sheets 10 and 30 were provided with a gradation-kirigami structure and a conductive stretchable elastic sheet 1 sample having an overlap margin of 1 mm each.

(Comparative Example 3)
As in Example 2, stretchable elastic sheets 10 and 30 having a thickness of 30 μm, a long side 10a of 42 mm, and a short side 10b of 12 mm were used. . . . 25f, gaps 26a, . . . , 26f, and peripheral edge portions 28a , . , in the same manner as in Example 2, a sample of an electrically conductive sheet with a non-gradation-kirigami structure was obtained.

(Tensile test 1 and tensile test 2)
Tensile tests were conducted in the same manner as in Tensile Test 1 with respect to the elongation rate, the maximum tensile strength, and the tensile stress at which the elongation rate is 50%. In addition, as shown in FIG. 7, a tensile test 2 for measuring the location of the fracture location and the number of fractured samples at that location for Example 2 ((a) in the figure) and Comparative Example 3 ((b) in the figure) did The results are summarized in Table 2.

(Resistance value measurement test)
Table 2 summarizes the results of measuring the resistance values.

As is clear from Table 2, the sample of Example 2, which has a gradation-kirigami structure, maintains the maximum tensile strength and the tensile stress that stretches to an elongation rate of 50% compared to the sample of Comparative Example 3, which has a non-kirigami structure. The extensibility rate improved. Also, the resistance value was improved because the area of the conductive film 20 was large. In Example 2 to which the present invention is applied, tearing occurs exclusively at the shortest crosslinked neck portion, whereas in Comparative Example 3 to which the present invention is not applied, there is no selectivity or specificity in the fracture position. Do you get it.

As described above, the stretchable elastic sheet and stretchable conductive wiring module to which the present invention is applied can be stretched and deformed with low stress, and it can be confirmed that they exhibit high shape recoverability, and furthermore, they have excellent conductivity. was confirmed.

This stretchable elastic sheet is flexible and has sufficient stretchability, does not cause a decrease in stretchability due to repeated stretching, and has excellent durability. It is useful as a stretchable base material for.

In addition, if this stretchable elastic sheet has a conductive base material or is formed of conductive rubber, it exhibits excellent conductivity while having stretchability, so it is suitable for wiring of a stretchable conductive wiring module. It is useful as a material.

This stretchable conductive wiring module is used for wearable devices, flexible devices such as flexible substrates, robots, and the like that require stretchable wiring.

1 is a stretchable elastic sheet, 10 is a rubber elastic sheet piece, 10a is a long side, 10b is a short side, 11a and 11b are end portions, 12, 12a . 14, 14a, . . . , _14f , connecting portions between cuts _; 20A is a flexible conductive layer; 20B is a flexible support; 21a and _21b are end portions; 25, 25a, . . . 26f is a blanking gap, 27, 27a, . . . , 27e are blanking holes , 28, 28a, . , 32 32 a . . . 32 f are cut slits, ₃₃ 33 a . longitudinal direction.

Claims (21)

a plurality of through slits and/or a plurality of through holes arranged in series and/or in parallel while intersecting the longitudinal direction of the rectangular rubber elastic sheet piece;
a row of peripheral edge connecting portions comprising a plurality of peripheral edge connecting portions connected between the through slits and/or the through holes and the long sides of the rubber elastic sheet pieces;
A plurality of cut slits and/or a plurality of cuts are provided alternately with the plurality of through slits and/or the plurality of through holes, and are cut from both the long sides of the rubber elastic sheet piece while facing inward. insertion hole;
A row of inter-cut connecting portions made up of a plurality of inter-cut connecting portions connected between the cut slits and/or the cut holes facing each other,
A stretchable elastic sheet having
In the horizontal direction orthogonal to the longitudinal direction, which is the longitudinal direction, at least one of the peripheral edge connecting portions and/or between the cuts in the middle of the peripheral edge connecting portion row and the inter-cut connecting portion row A stretchable elastic sheet, wherein the lateral width of the connecting portion is shorter than the lateral width of the peripheral edge connecting portion and/or the inter-cut connecting portion at the end of each row. The lateral width of the peripheral edge connecting portion and/or the inter-notch connecting portion becomes shorter toward the middle of the row of the peripheral edge connecting portion and the inter-notch connecting portion row. Item 1. The stretchable elastic sheet according to item 1. Among the row of peripheral edge connecting portions and the row of inter-cut connecting portions, the width of the shortest peripheral edge connecting portion and/or the inter-cut connecting portion is 1/50 to 1 of the width of the rubber elastic sheet piece. /2, the stretchable elastic sheet according to any one of claims 1 and 2. Among the row of peripheral edge connecting portions and the row of inter-cut connecting portions, the width of the peripheral edge connecting portion and/or the width of the shortest connecting portion between the cuts is at least 0.1 mm. The stretchable elastic sheet according to any one of claims 1 to 3. 2. The through-slit or the cut-out slit has a through-hole at each end and/or the through-hole or the cut-out is rounded at each corner. 4. The stretchable elastic sheet according to any one of 1 to 4. The rubber elastic sheet piece is made of silicone rubber, silicone resin, polyurethane, plastic elastomer, ethylene-propylene rubber, ethylene-propylene-diene-methylene rubber, fluororubber, and/or natural rubber. The stretchable elastic sheet according to any one of claims 1 to 5, characterized by: A flexible conductive base material having a conductive layer electrically bridges a plurality of punched peripheral portions penetrating with punched slits and/or punched holes arranged in series and/or parallel along the direction of current flow of the conductive layer. the rubber elastic sheet piece is sealed and covered without exposing at least a portion of the conductive base material, and
In a row of bridge necks comprising a plurality of bridge necks, the width of at least one of the bridge necks in the middle of the row is shorter than the width of the bridge necks at the ends of the row,
The insulating rubber elastic sheet piece is penetrated by the through slit and/or the through hole that is smaller than the punch hole and the punch slit in accordance with the punched peripheral portion,
The conductive base material has blanking gaps between the plurality of blanking peripheral edge portions, and the rubber elastic sheet piece has the cut slits and/or the cut slits smaller than the blanking gaps corresponding to the blanking gaps. 7. The stretchable elastic sheet according to any one of claims 1 to 6, characterized in that the cut holes penetrate through the stretchable elastic sheet. 8. The stretchable elastic sheet according to claim 7, wherein the width of the cross-linking necks in the cross-linking neck rows gradually decreases toward the middle of the rows. 9. The stretchable elastic sheet according to any one of claims 7 and 8, characterized in that both surfaces of said conductive base material are sealed and covered with said rubber elastic sheet piece while covering at least said punched peripheral edge portion. . 10. The stretchable elastic sheet according to any one of claims 7 to 9, wherein a single or a plurality of said conductive substrates are provided along said longitudinal direction. 11. The stretchable elastic sheet according to any one of claims 7 to 10, wherein the punched peripheral portion is thicker on the long side than on the inner side. 12. The stretchable elastic sheet according to any one of claims 7 to 11, wherein the conductive substrate has the conductive layer on a flexible support. The stretchable elastic sheet according to any one of claims 7 to 12, wherein the conductive layer is a metal film layer, an organic conductive film layer, and/or a conductive inorganic substance-containing conductive film layer. The extraction slit has a through hole at each end, and/or at least one of the extraction hole, the extraction gap, the extraction peripheral portion , and the bridging neck is located at each corner. 14. The stretchable elastic sheet according to any one of claims 7 to 13, characterized in that it is rolled up. 15. The stretchable elastic sheet according to any one of claims 7 to 14, wherein the conductive base material has an electrical connector at the end of the conductive layer. 2. The stretchable elastic sheet according to claim 1, wherein said rubber elastic sheet piece is made of conductive rubber. 17. The stretchable elastic sheet according to claim 16, wherein said rubber elastic sheet pieces have electrical connectors at their ends. A stretchable conductive wiring module comprising a single stretchable elastic sheet or a plurality of stretchable elastic sheets according to any one of claims 7 to 17. 19. The stretchable conductive wiring module according to claim 18, wherein a plurality of said stretchable elastic sheets are overlapped and integrated. The stretchable conductive wiring module according to any one of claims 18 to 19, characterized in that each of the plurality of conductive substrates has a separate terminal as a terminal, and the terminal is connected to an external terminal. . 21. The stretchable conductive wiring module according to any one of claims 18 to 20, wherein the plurality of conductive substrates constitute a pair or a plurality of pairs of electrodes.

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