JP7094846B2 - Pressure sensor sheet - Google Patents

Description

The present invention relates to a pressure sensor sheet used in a device for measuring a ground contact state of a tire, a sole, a track point, or the like.

Conventionally, the invention disclosed in Patent Document 1 below is known as a method for measuring a ground contact state of a tire or the like. The present invention comprises a substrate having a surface for grounding a tire, a pressure sensor sheet arranged on the surface of the substrate and having a plurality of pressure measurement points, a protective sheet covering the surface of the pressure sensor sheet, and the like. The pressure sensor sheet is an invention of a structure in which a resin whose electric resistance is reduced according to the amount of deformation when compressed between the first linear electrode and the second linear electrode is filled.

Then, the electric resistance of this resin decreases as the force for pressing the outer surface of the sheet increases. Therefore, when the sheet is pressed at the intersection of the first linear electrode and the second linear electrode in a plan view, the electrical resistance between the first linear electrode and the second linear electrode becomes smaller. Therefore, by measuring the electric resistance, the force acting on the resin at the intersection can be measured, and the contact patch shape and the contact pressure distribution of the tire can be obtained.

Japanese Unexamined Patent Publication No. 2018-72041

However, the pressure due to the tire is very large with the weight of the vehicle body exceeding 1 ton added, and the friction when the tire rotates is also very large. Therefore, a pressure sensor sheet with such a structure cannot be used because the protective sheet on the surface is worn out or the linear electrodes are damaged after only a few tests. There was a problem that it was necessary to procure a pressure sensor sheet for the product, which led to a significant cost increase. In addition, there is a difference in the measured value due to the variation between the pressure sensor sheets, and there is a problem that the accuracy of the measured value itself is lowered.

The present invention has been devised in view of the above circumstances, and has made it possible to remove a substrate having a worn-out protective layer or a damaged first electrode, and to replace them as appropriate. It is the invention of the pressure sensor sheet.

That is, in the first embodiment of the present invention, the first electrode is formed on the substrate, the insulating layer is formed on the first electrode, the second electrode is formed on the insulating layer, and the second electrode is formed. A pressure sensor sheet having a protective layer formed therein and capable of calculating the pressure applied from above the protective layer, wherein the protective layer or the substrate on which the first electrode is formed is removable. ,.

Further, in the second embodiment of the present invention, the substrate on which the removable protective layer or the first electrode is formed is a laminate of a base material and a self-adsorbent glue or a minute suction cup layer. It is a characteristic pressure sensor sheet. A third embodiment of the present invention is a pressure sensor sheet, characterized in that the insulating layer is made of an electrorheological fluid or an electroadsorptive gel. Further, the fourth embodiment of the present invention is a pressure sensor sheet characterized in that the insulating layer can be removed at the same time as the protective layer or the first electrode can be removed. A fifth embodiment of the present invention is a pressure sensor sheet, wherein the substrate or insulating layer on which the removable protective layer or the first electrode is formed is a laminated body having a plurality of laminated structures. be. A sixth embodiment of the present invention is a pressure sensor sheet used in a device for measuring a ground contact state of any one of a tire, a shoe sole, and a track point.

In the pressure sensor sheet of the present invention, a first electrode is formed on a substrate, an insulating layer is formed on the first electrode, a second electrode is formed on the insulating layer, and a protective layer is formed on the second electrode. Is a pressure sensor sheet capable of calculating the pressure applied from the protective layer, and the substrate on which the protective layer or the first electrode is formed is removable.

Therefore, even if the protective sheet on the surface is worn out, the measurement can be continued only by replacing the protective sheet on the surface. Further, even if the first electrode is damaged and becomes unusable, the measurement can be continued only by replacing the substrate on which the first electrode is formed. Therefore, there is no need to procure another new pressure sensor sheet, which has the effect of significantly reducing costs. Further, since the period during which one pressure sensor sheet can be continuously used is lengthened, the error of the measured value due to the variation between the pressure sensor sheets is reduced, and as a result, the accuracy of the measured value itself is improved.

Further, in the case of a protective layer, there is also an excellent synergistic effect that a plurality of protective layers having different surface conditions can be prepared, and a protective layer suitable for the protective layer can be appropriately selected and replaced according to the intended use and purpose of use. In particular, the surface of the road surface where the tires are in contact is in a variety of different conditions, and there is a demand to measure how the pressure distribution changes with respect to those road surface conditions, and the effect of being able to meet that demand. There is.

Further, in the case of a substrate on which the first electrode is formed, a plurality of first electrodes having different measurement methods or substrates having different structures are prepared, and the first electrode or substrate suitable for the application or purpose of use is prepared. There is also an excellent synergistic effect of being able to select and replace as appropriate. In particular, regarding the pressure distribution of the sole, there is also a demand to measure various pressure distributions, such as when you want to precisely measure only the pressure value in the Z-axis direction or when you want to precisely measure the shear force value in the XY direction. There is an effect that it can respond to it.

Further, the pressure sensor sheet of the present invention is characterized in that the substrate on which the removable protective layer or the first electrode is formed is a laminate of a base material and a self-adsorbent glue or a minute suction cup layer. do. Alternatively, the insulating layer is characterized by being made of an electrorheological fluid or an electroadsorptive gel. Therefore, there is an effect that only the protective layer can be removed very easily from the pressure sensor sheet, or only the substrate on which the first electrode is formed can be removed very easily from the insulating layer on which the electrodes are formed. Further, there is an effect that the insulating layer can be removed at the same time as the protective layer or the first electrode is removed.

Further, the pressure sensor sheet of the present invention is characterized in that the substrate on which the first electrode is formed has a plurality of laminated structures. Therefore, among the substrates on which a plurality of first electrodes are formed, only the substrate on which the first electrode that can no longer be used is formed and replaced with the substrate on which the new first electrode is formed can be used to continue the use. effective.

FIG. 3 is a cross-sectional view of a pressure sensor sheet according to an embodiment of the present invention in which a substrate on which a protective layer, an insulating layer, and a first electrode are formed has a laminated structure. It is sectional drawing of the pressure sensor sheet of one Embodiment of this invention which is trying to remove a part of a protective layer. It is sectional drawing of the pressure sensor sheet of one Embodiment of this invention which is going to remove a part of the substrate on which the first electrode was formed. It is sectional drawing of the pressure sensor sheet of one Embodiment of this invention which is trying to remove a part of an insulating layer at the same time as the whole protective layer. FIG. 3 is a cross-sectional view of an embodiment in which the protective layer is composed of a laminate of a base material, a minute suction cup layer, and a base material and a self-adsorptive glue layer. The insulating layer is a cross-sectional view of an embodiment made of an electrically adsorptive gel, in which (a) shows a state in which peeling and separation can be easily performed when there is no electric field, and (b) is that adsorption is exhibited by applying an electric field. Indicates the state of being.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the pressure sensor sheet 1 of the present invention, the first electrode 20 is formed on the substrate 10, the insulating layer 30 is formed on the first electrode 20, and the second electrode 40 is formed on the insulating layer 30. A pressure sensor sheet in which a protective layer 50 is formed on the second electrode 40 and the pressure applied from above the protective layer 50 can be calculated, and the substrate 10 on which the protective layer 50 or the first electrode 20 is formed is removed. It is characterized by being possible (FIG. 1, FIG. 2, FIG. 3). Alternatively, the insulating layer 30 may be removable at the same time as the protective layer 50 or the substrate 10 is removed (FIG. 4). The first electrode 20 and the second electrode 40 may be interchanged. That is, the second electrode 40 may be formed on the substrate 10, and the first electrode 20 may be formed on the insulating layer 30.

Detachable in the present invention means that they can be separated separately by any means, and the means and labor and time for removal are not limited. Also, even if a part of the layer is separated and cannot be completely removed, if the removed layer has the original function, the layer is considered to be removable.

The removable protective layer 50 and the substrate 10 preferably have a self-adsorbing glue layer 70 and a minute suction cup layer 71 formed on the base material 51 (see FIG. 5). This is because with such a configuration, only the substrate 10 on which the protective layer 50 and the first electrode 20 are formed can be peeled off from the pressure sensor sheet 1 and removed and replaced very easily. Further, in the laminated structure as shown in FIG. 5, only the protective layer of the base material 51 and the minute suction cup layer 71 can be removed and replaced (FIG. 2). The self-adsorbing glue layer 70 and the minute suction cup layer 71 are preferably formed on the insulating layer 30 side on the base material 51 as shown in FIG. 5, but are not on the base material 51 but on the insulating layer 30. It may be provided in.

The material of the base material 51 of the protective layer 50 includes synthetic resin sheets such as polyester, polypropylene, polystyrene, polyolefin, silicon, fluorine, urethane, acrylic, polycarbonate, polyacetal, and polyvinyl chloride, polyester fibers, and polyethylene fibers. Examples thereof include non-woven sheets such as polypropylene fibers, cellulose fibers, aramid fibers, glass fibers and polyamide fibers, as well as paper and felt. If necessary, the outermost surface layer may be provided with a hard coat layer or a wax layer made of an ultraviolet curable resin such as cyanoacrylate. The thickness may be appropriately selected in the range of 20 μm to 5 mm.

The material of the substrate 10 includes general-purpose substrate materials such as glass polyimide, glass epoxy, paper epoxy, paper phenol, fluorine, glass polyphenylene oxide, and glass composite, as well as polyimide, polyester, polyamideimide, polysulfone, and polyether ether ketone. Examples thereof include a metal plate in which an insulating layer is provided on a metal such as a synthetic resin film, ceramic, or aluminum. The thickness may be appropriately selected in the range of 30 μm to 4 mm.

The material of the self-adhesive glue layer 70 is a two-component curable urethane resin composed of a polyol and a polyisocyanate cross-linking agent, a synthetic rubber resin such as styrene butadiene latex, butadiene rubber, nitrile rubber, isoprene rubber, and chloroprene rubber. In addition, natural rubber-based resin, acrylic-based resin, silicone-based resin and the like can be mentioned.

The method for forming the self-adsorptive glue layer 70 is not particularly limited, and is coated with a general-purpose printing method such as an offset or screen or a general-purpose coater such as a lip coater or a reverse coater to have a thickness of 10 to 500 μm. It is good to form with.

The minute suction cup layer 71 has a property of pressure-sensitive adsorption if the insulating layer 30 to be attached is smooth. And it can be easily peeled off by hand and does not become sticky like an adhesive. The minute suction cup 42 preferably has suction cup-shaped fine holes having a size of 1 to 500 μm formed at a ratio of 10,000 to 100,000 per square cm. If the size of the suction cup is less than 2 μm, it flexibly sticks to the contact surface and an adsorption effect is generated due to the difference in atmospheric pressure. When the average size of the suction cup-shaped micropores is less than 1 μm and only 10,000 pieces are formed per square cm, or when the average size of the suction cup-shaped micropores exceeds 500 μm and is 1 square cm. If more than 100,000 pieces are formed per hit, the adsorption force may decrease.

As a method for forming the fine suction cup layer 71, innumerable fine bubbles are generated while mechanically blowing air into the synthetic resin emulsion liquid to form a foamy synthetic resin emulsion liquid, which is protected by a coater or spraying. It may be formed by applying it to the surface of the base material 51 or the substrate 10 of the layer and removing the solvent by scattering. The minute suction cup layer 71 preferably has a hole shape that penetrates when the thickness of the base material 51 or the substrate 10 of the protective layer is less than 50 μm, and a concave recessed hole shape that does not penetrate when the thickness is 2 mm or more. Is preferable. When the thickness is 50 μm to 2 mm, either form may be used.

The material of the synthetic resin of the emulsion liquid is not particularly limited, and examples thereof include phenol resin, urethane resin, acrylic resin, polyester resin, polyolefin resin, fluororesin, polyacetal resin, epoxy resin, alkyd resin, butagen-based synthetic rubber, and the like. May be used alone or in combination of two or more. Of these, a mixture of a urethane resin and an acrylic resin having a glass transition temperature of -10 ° C or lower and / or a butagen-based synthetic rubber is preferable, and a mixture of the urethane resin and an acrylic resin and / or a butagen-based synthetic rubber having a glass transition temperature of -10 to -50 ° C. Is more preferable.

Further, the protective layer 50 and the substrate 10 may be removable by making the insulating layer 30 an electrorheological fluid. An electroviscous fluid is a fluid whose viscoelastic properties change reversibly when an electric field is applied or removed, and can be used for uniform electroviscous fluids made of a single substance such as liquid crystal, insulating liquids, and the like. Examples thereof include a dispersion-based electroviscous fluid in which particles are dispersed. When an electric field is applied, it changes from a liquid state to a solid state and develops a function as an adhesive layer. That is, since the base materials 51 and 11 are liquid when there is no electric field, the base materials 51 and 11 can be easily removed from the insulating layer 30, but when an electric field is applied, the electrorheological fluid 72 solidifies and the base materials 51 and 11 and the insulating layer. The function as an adhesive layer connecting with 30 is exhibited.

As a method for producing a layer of an electrically viscous fluid, the porous particles after drying are added to the electrically insulating liquid while being stirred while maintaining the decomposition temperature of the electrically insulating liquid or higher, so that the porous particles exist in the vicinity of the porous particles. Examples thereof include a method of decomposing an electrically insulating liquid to generate a low molecular weight organic compound and uniformly adsorbing the organic compound on the surface of the porous particles.

Alternatively, the protective layer 50 and the substrate 10 may be removable by making the insulating layer 30 an electrically adsorptive gel 73. The electrorheological gel 73 is formed by adding organic or inorganic particles 74 having an average particle diameter of 2 to 50 μm to the electrorheological fluid 72 to form a gel, and when an electric field is applied, the particles 74 are contained in the gel. It is buried and the surface condition changes. That is, when there is no electric field, the particles 74 protrude from the gel surface and the surface is in an uneven state, the contact area with other layers is small, and the particles can be easily separated by peeling (FIG. 6A). ), When an electric field is applied, the interparticle attraction of the particles 74 shortens the interparticle distance and at the same time pushes the gel out, and the electric force at the interface causes the gel to rise and the surface becomes a smooth flush surface of the gel only. In contact with the entire surface of the layer, adsorption is exhibited (FIG. 6 (b)).

Examples of the method for producing the layer of the electrically adsorptive gel 73 include a method in which a cross-linking agent, a platinum catalyst, or the like is added to an insulating liquid such as silicone oil, and particles 74 are added to perform heat treatment. The surface of the insulating layer 30 may be provided with countersunk irregularities so that the insulating layer 30 does not swell due to the swelling of the protective layer 50 when pressed into the concave portions of the insulating layer 30. The shape of the counterbore-like unevenness may be appropriately selected depending on the material and thickness of the insulating layer 30. The surface of the insulating layer 30 may be provided with countersunk irregularities so that the insulating layer 30 does not swell due to the swelling of the protective layer 50 when pressed into the concave portions of the insulating layer 30. The shape of the counterbore-like unevenness may be appropriately selected depending on the material and thickness of the insulating layer 30.

Further, the substrate 10 on which the removable protective layer 50 and the first electrode 20 are formed may have a laminated structure of two or more layers, and a part of the protective layer 50 and the substrate 10 may be removable (Fig.). 1). Further, the insulating layer 30 may have a laminated structure so that a part of the insulating layer 30 can be removed (FIG. 1). This is because the structure is composed of a plurality of layers, and if only a part of the layers is damaged or deteriorated, only the damaged or deteriorated layer needs to be replaced. In addition, the thickness of those layers is only thinned as a whole without replacement, and if it is within the thickness range that can perform a predetermined function even if it is thinned, simply continue to use it with it removed. Is also possible.

As a method of forming the substrate 10 on which the protective layer 50 and the first electrode 20 are formed into a laminated structure of a plurality of layers, each layer manufactured separately is coated with an adhesive layer or the like as necessary, and these are applied. Examples thereof include a method of laminating and laminating by applying pressure, and a method of sequentially laminating and forming each layer on a carrier sheet by coating. When the plurality of layers are formed in this way, it is preferable to set the total thickness to be the above-mentioned thickness. The materials and thicknesses of these layers may be the same or different.

For example, the protective layer 50 is composed of a base material 51 made of a polyvinyl chloride resin sheet, a layer made of a self-adsorptive glue layer 70, a base material 51 made of a non-woven fabric sheet 51 made of polyester fibers, and a layer made of a minute sucker 71. It may have a laminated structure (FIG. 5), or the insulating layer 30 may have a laminated structure of an electrorheological fluid and an electroadsorbent gel 73. Similarly, for example, the substrate 10 may have a laminated structure composed of a base material made of a glass epoxy plate on which a self-adsorptive glue layer 70 is formed and a base material made of a polyimide film on which a minute suction cup 71 is formed. By using a combination of completely different materials and thicknesses in this way, there is also the effect of making the best use of the characteristics of each layer.

The material of the first electrode 20 is a metal film such as gold, silver, copper, platinum, palladium, aluminum, rhodium, a conductive paste film in which these metal particles are dispersed in a resin binder, or polyhexylthiophene or poly. Examples thereof include organic semiconductors such as dioctylfluorene, pentacene, and tetrabenzoporphyrin, but the present invention is not particularly limited. The first electrode 20 is formed by directly forming a pattern by etching after forming the entire surface of the conductive film by a sputtering method, a vacuum vapor deposition method, an ion plating method, or a printing method such as a screen, gravure, or offset. It is formed on the substrate 10 located at the lower part of the insulating layer 30.

The material of the second electrode 40 is also a metal film such as gold, silver, copper, platinum, palladium, aluminum, rhodium, a conductive paste film in which these metal particles are dispersed in a resin binder, or polyhexylthiophene or polydioctyl. Examples thereof include organic semiconductors such as fluorene, pentacene and tetrabenzoporphyrin, but the present invention is not particularly limited. The second electrode 40 can be formed in the same manner as the electrode 40, but is formed on the upper portion of the insulating layer 30.

The second electrode 40 may be formed mainly on the upper portion of the insulating layer 30 and may be composed of only one layer or two or more layers. The pattern of the second electrode 40 may be any shape such as a round shape, a square shape, and a linear shape. The thickness of the second electrode 40 may be appropriately selected within the range of 0.1 μm to 100 μm.

A wiring pattern is connected from each of the second electrodes 40, and is electrically connected to an external controller. As a detection method, in addition to the method of measuring the pressure 60 by the same electric resistance measurement as in Patent Document 1, the change in the capacitance value generated between the first electrode 20 and the second electrode 40 is detected. A method of detecting the pressure 60 can be mentioned. In particular, if a change in the capacitance value generated between the first electrode 20 and the plurality of second electrodes 40 is detected, not only the pressure 60 in the Z-axis direction applied from above the protective layer 50 but also XY It is preferable because it has the effect of calculating the shear force in the axial direction.

That is, the protective layer 50 and the insulating layer 30 are deformed in a concave shape by the pressing force of the pressure 60, whereby the plurality of second electrodes 40 formed on the insulating layer and the first electrode formed on the substrate 10 are formed. The distance to 20 changes. The change in the distance is also correlated with the pressing force of the shearing force and the change in the capacitance value between the plurality of second electrodes 40 and the first electrode 20. Therefore, if the change in the capacitance value between the plurality of second electrodes 40 and the first electrode 20 is measured, the indirectly applied shear force can be measured.

It should be noted that the displacement of the second electrode 40 at one point in the XY direction affects the other second electrodes 40 on the periphery, so that it does not affect the sensitivity of the capacitance value to be measured as noise. In order to do so, the surface of the protective layer 50 or the insulating layer 30 may be cut. When making this cut, it is preferable that the thickness of the protective layer 50 and the insulating layer 30 is in a slightly thick range of 500 μm to 5 mm. Examples of the form of the cut include a dotted line, a broken line, a long chain line, a single point chain line, and a long two point chain line. The cut may be a single line or a plurality of lines. The depth of the cut may be completely penetrated or may be half-cut halfway. Examples of the method for forming the cut include a method for punching a Thomson blade.

Further, conductive particles such as carbon black, gold, silver, and nickel may be added to the insulating layer 30 at a ratio within a range in which the insulating property can be maintained to improve the sensitivity of the capacitance value. This is because when the insulating layer 30 is pressed, the distance between the contained conductive particles is reduced, and the capacitance value between the first electrode 20 and the second electrode 40 has an effect of rapidly increasing. The average particle size of the conductive particles is preferably 1/10 or less of the thickness of the insulating layer 30.

Hereinafter, as Example 1 of the present invention, a pressure sensor sheet when used in a tire ground contact state measuring device will be described. The pressure sensor sheet of Example 1 was manufactured by the following procedure. A plurality of second electrodes having a pitch of 1.5 mm and a pattern of 1 mm square were formed with silver paste on the upper surface of an insulating layer made of a urethane rubber resin having a thickness of 300 μm by a screen printing method. On the other hand, a 0.1 mm thick polyimide resin film substrate on which a 35 μm thick first electrode was formed was laminated on the lower surface of the insulating layer to obtain a pressure sensor sheet. The plurality of second electrodes and the first electrode were connected to a controller capable of detecting a change in the capacitance value through a lead-out wiring.

Next, a base material made of a non-woven fabric sheet having a thickness of 300 μm made of a polyester fiber having a minute suction cup formed on the upper surface of the insulating layer on which a plurality of second electrodes are formed and a modified urethane. A pressure sensor sheet was obtained by laminating as a protective layer a base material made of a 100 μth thick polyvinyl chloride resin sheet on which a self-adhesive glue made of a resin was applied and formed. Using this manufactured pressure sensor sheet, a test was conducted at a running speed of 40 km / hour for a radial tire having a tire width of 195 mm, a flatness of 65%, and a wheel size of 15 inches under an environmental temperature of 10 ° C.

The measurement results are as follows. The test was carried out up to the 5th time, the base material made of a polyvinyl chloride resin sheet was removed, and the base material made of a new polyvinyl chloride resin sheet was replaced with a new base material. After that, the test was performed 14 times without any abnormality. .. In addition, the test was carried out up to 12 times, both the base material made of a non-woven fabric sheet and the base material made of a polyvinyl chloride resin sheet were removed, and replaced with a new base material made of a non-woven fabric sheet and a base material made of a polyvinyl chloride resin sheet. After that, I was able to test 10 times without any abnormality. The table below summarizes the results. It is a table comparing with the result of the test without removing the protective layer at all, and when the protective layer was not removed at all, the number of tests was up to about 16. All of these tests are one-time exchanges, but it was confirmed that increasing the number of exchanges cumulatively increases the number of tests that can be performed.

Hereinafter, as Example 2 of the present invention, a pressure sensor sheet when used in a ground contact state measuring device for shoe soles will be described. The pressure sensor sheet of Example 2 was manufactured by the following procedure. An extrusion molding machine in which an azodicarbonamide foaming agent and carbon black having an average diameter of 30 μm are dispersed in a polystyrene resin material at a weight ratio of 10: 0.6: 0.1 to provide a gap of 0.5 mm thickness. A sheet-like insulating layer was formed through the space. Next, heat was applied to foam the beads, and pressure was applied to form counterbore-like irregularities on the surface. On the upper surface of this insulating layer, a plurality of second electrodes made of copper having a pitch of 1.5 mm and a pattern of 1 mm square were formed on the entire surface by a partial plating method. Next, a sheet made of urethane rubber resin having a thickness of 1 mm was laminated as a protective layer.

On the other hand, a 0.1 mm-thick polyimide resin film substrate having a 10 μm-thick polyhexylthiophene-based organic semiconductor first electrode formed on the lower surface of the insulating layer and a 35 μm-thick copper film first electrode having the same 35 μm-thick copper film. A pressure sensor sheet was obtained by laminating the formed 1 mm thick glass epoxy substrate. The plurality of second electrodes and the first electrode were connected to a controller capable of detecting a change in the capacitance value through a lead-out wiring. Obtained a pressure sensor sheet. Using this manufactured pressure sensor sheet, a test was conducted in which a tester wearing shoes with a size of 27 cm and a pressure sensor sheet attached was allowed to walk at a walking speed of 6 km / hour under an ambient temperature of 20 ° C.

The measurement results are as follows. The test was carried out up to the 55th time, the first electrode substrate of the polyimide resin film was removed, replaced with a new first electrode substrate, and the test was carried out. After that, the test could be performed 45 times without any abnormality. If the test was performed without removing the substrate at all, the test could be performed only up to about 160 times, but the test could be performed up to 100 times by exchanging the polyimide resin film substrate once. This test is a one-time exchange, but it was confirmed that the number of tests that can be performed increases dramatically if the number of exchanges is increased.

Hereinafter, as Example 3 of the present invention, a pressure sensor sheet when used for a track pad of a personal computer will be described. The pressure sensor sheet of Example 3 was manufactured by the following procedure. Copper with a pattern of 0.3 mm square at intervals of 0.6 mm on the upper surface of an insulating layer made of an electroadhesive gel sheet made into a gel by adding inorganic particles with an average particle diameter of 10 μm to an electrorheological fluid with a thickness of 300 μm. A plurality of second electrodes made of the above were formed on the entire surface by a partial plating method. Next, a polycarbonate resin sheet having a thickness of 0.1 mm having a hard coat layer made of a cyanoacrylate ultraviolet curable resin formed on the surface was laminated as a protective layer.

On the other hand, a pressure sensor sheet was obtained by laminating a 1 mm thick glass epoxy substrate having a first electrode made of a copper film having a thickness of 35 μm formed on the lower surface of the insulating layer. The plurality of second electrodes and the first electrode were connected to a controller capable of detecting a change in the capacitance value through a lead-out wiring. Using this manufactured pressure sensor sheet, dozens of tests were conducted by having the tester trace the track pad with the pressure sensor sheet attached at a size radius of 2 mm at an environmental temperature of 20 ° C at 40 mm / sec. Carried out. During the test, an electric field was continuously applied to the electrically adsorptive gel sheet.

The measurement results are as follows. When the test was carried out up to the 28th time and the application of the electric field to the insulating layer made of the electrically adsorptive gel sheet was stopped, the protective layer of the polycarbonate resin sheet could be easily removed from the insulating layer. Then, when a 0.1 mm thick polycarbonate resin sheet having a hard coat layer made of cyanoacrylate ultraviolet curable resin formed on a new surface is placed on the insulating layer as a protective layer and electric field application is restarted, the new protective layer is insulated. It adhered to the layer and was able to be tested 25 times without any abnormalities. If we tested without removing the protective layer at all, we could only test up to about 30 times, but we were able to test more than 50 times with one replacement of the protective layer. This test is a one-time exchange, but it was confirmed that the number of tests that can be performed increases dramatically if the number of exchanges is increased.

1 Pressure sensor sheet 10 Substrate 20, 21, 22 First electrode 30 Insulation layer 40, 41 Second electrode 50 Protective layer 51 Protective layer base material 60 Shear force 70 Self-adhesive glue layer 71 Microscopic sucker layer 72 Electrorheological fluid 73 Electro-adsorbent gel 74 Particles contained in the electro-adsorbable gel

Claims (5)

The first electrode is formed on the substrate,
An insulating layer is formed on the first electrode, and an insulating layer is formed.
A second electrode is formed on the insulating layer, and a second electrode is formed.
A protective layer is formed on the second electrode, and a protective layer is formed.
A pressure sensor sheet capable of calculating the pressure applied from above the protective layer.
The protective layer or the substrate on which the first electrode is formed is removable.
The substrate on which the removable protective layer or the first electrode is formed is
A pressure sensor sheet that is a laminate of a base material and a self-adsorptive glue or a minute suction cup layer. The first electrode is formed on the substrate,
An insulating layer is formed on the first electrode, and an insulating layer is formed.
A second electrode is formed on the insulating layer, and a second electrode is formed.
A protective layer is formed on the second electrode, and a protective layer is formed.
A pressure sensor sheet capable of calculating the pressure applied from above the protective layer.
The protective layer or the substrate on which the first electrode is formed is removable.
A pressure sensor sheet in which the insulating layer is made of an electrorheological fluid or an electroadsorptive gel. The first electrode is formed on the substrate,
An insulating layer is formed on the first electrode, and an insulating layer is formed.
A second electrode is formed on the insulating layer, and a second electrode is formed.
A protective layer is formed on the second electrode, and a protective layer is formed.
A pressure sensor sheet capable of calculating the pressure applied from above the protective layer.
The protective layer or the substrate on which the first electrode is formed is removable.
The pressure sensor sheet according to claim 1 or 2 , wherein the insulating layer can be removed at the same time as the protective layer or the first electrode is removed. The substrate or insulating layer on which the removable protective layer or first electrode is formed
The pressure sensor sheet according to any one of claims 1 to 3 , which is a laminated body having a plurality of laminated structures. The pressure sensor sheet according to any one of claims 1 to 4 , which is used in a device for measuring a ground contact state of any of a tire, a sole, and a track point.

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