JP5350725B2 - Pressure sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure-sensitive sensor for detecting a pressure, even for small loads and eliminating waste of power consumption. <P>SOLUTION: The pressure-sensitive sensor 120 includes a base material 6 forming a pair of electrodes 7a, 7b, and a flexible film 5 arranged to be laminated on the base material 6. The flexible film 5 includes a pressure-sensitive ink layer 8 that changes the electrical characteristics by an applied push force and a dot spacer 10, at a position facing the pressure sensitive ink layer 8 of the surface of the electrodes 7a, 7b provided on the base material 6 by arranging both of the pair of the electrodes 7a, 7b at positions capable of being covered. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a pressure-sensitive sensor for measuring a pressure distribution of a directional component perpendicular to a surface among external forces applied to the surface.

  Conventionally, as a sensor for distributing the pressure of an external force applied to a certain surface, for example, a sensor having a configuration as described in Patent Document 1 can be cited. As shown in FIG. 1 of the cited document 1, such a sensor is formed by laminating two films so that an air layer is separated by a spacer, and an upper electrode is disposed in an upper layer and a lower electrode is disposed in a lower layer. The pressure-sensitive ink layer is arranged between them.

  And when pressure is applied to the upper film, only the portion where pressure is applied becomes conductive in the vertical direction, so output is obtained only at the lower electrode corresponding to the intersection so that pressure distribution is detected. It is configured. For example, by providing the pressure-sensitive sensor inside the vehicle seat, it is possible to determine whether the occupant is sitting on the seat and to determine the physique of the occupant from the pressure distribution.

  That is, the pressure-sensitive sensor disclosed in the cited document 1 is arranged so that the spacer is sandwiched between the upper and lower films in order to provide an air layer between the upper and lower films. Then, when pressure is applied, the pressure sensitive ink layer comes into contact with the electrode by bending the upper film. In this case, the pressure applied to the upper film is measured by detecting a short circuit between both electrodes through the pressure-sensitive ink layer and a change in resistance value corresponding to the pressure applied to the pressure-sensitive ink layer.

  However, it has been difficult to stably control the contact between the pressure-sensitive ink layer and the electrode with a load due to problems such as the upper film sagging when the film sags over time. Therefore, the reproducibility of the resistance value between the pressure-sensitive ink and the electrode due to the load is low, and it is difficult to measure the pressure with high accuracy. Moreover, in the pressure sensitive sensor of the said structure, since it comprised so that an electrode might be arrange | positioned in the most part of the surface of a film, the pressure sensitive sensor was not able to be comprised by permeability | transmittance.

In order to solve such a problem, the present applicant has applied for a pressure-sensitive sensor having a structure in which a pair of electrodes is provided on the lower film and the pair of electrodes are covered with pressure-sensitive conductive layer ink. . In such a pressure-sensitive sensor, a pair of electrodes is provided on the lower film, and the pressure-sensitive conductive layer ink provided on the upper electrode normally covers the electrodes, so that a spacer for the air layer is provided between the upper film and the lower film. There is no need to place between films. Therefore, it can be set as the sensor of arbitrary shapes according to an electrode installation shape. By configuring the pair of electrodes in a frame shape, the central portion of the pressure sensor can be configured to be transparent, and a touch panel or the like can be disposed on the transparent portion.
JP 2002-48658 A

  However, in a pressure sensor with such a configuration, the change in resistance value of the pressure-sensitive conductive layer ink due to the load is small at a small load, so the amount of current flowing between the pressure-sensitive conductive layer ink and the electrode is almost constant, and pressure detection is not possible. It was difficult to carry out with high accuracy.

  In addition, even when no load is applied, the pair of electrodes has conductivity, so that wasteful power is consumed.

  Therefore, the technical problem to be solved by the present invention is to provide a pressure sensor that solves the above-described problem, can detect pressure even with a small load, and can eliminate waste of power consumption. .

  In order to solve the above technical problem, the present invention provides a pressure sensitive sensor having the following configuration.

According to the first aspect of the present invention, a base material having a pair of electrodes formed on the surface;
It is possible to provide a pressure-sensitive ink layer, which is laminated on the base material and whose electric characteristics are changed by the applied pressing force, at a position where at least a part of both of the pair of electrodes provided on the base material can be covered simultaneously. A flexible film;
Have a, a spacer provided in a position opposed to the pressure sensitive ink layer on the surface of the electrode provided on the substrate,
The pair of electrodes are provided in a frame shape around the base material,
The ink layer is provided on the flexible film so as to cover a corner portion of a pair of electrodes provided in a frame shape .
According to the second aspect of the present invention, a base material having a pair of electrodes formed on the surface;
It is possible to provide a pressure-sensitive ink layer, which is laminated on the base material and whose electric characteristics are changed by the applied pressing force, at a position where at least a part of both of the pair of electrodes provided on the base material can be covered simultaneously. A flexible film;
A spacer provided at a position facing the pressure-sensitive ink layer on the surface of the electrode provided on the substrate;
The pair of electrodes are provided in a frame shape around the base material,
The ink layer is provided on the flexible film over the entire circumference of a pair of electrodes provided in a frame shape.

According to a third aspect of the present invention, there is provided the pressure sensitive sensor according to the first or second aspect, wherein the spacer is provided in a dot shape on the surface of the electrode.

According to the fourth aspect of the present invention, the base material and the flexible film are made of a transparent material, and a transparent window portion is formed in a portion where the pair of electrodes and the pressure-sensitive ink layer are not provided. A pressure-sensitive sensor according to any one of the first to third aspects is provided. In the above aspect, the transparent window portion may include the transparent material itself, and the translucent portion may function as a transparent window, or an electrode and a pressure-sensitive ink layer are provided among the transparent materials. You may form by hollowing out the part which is not.

According to a fifth aspect of the present invention, there is provided the pressure-sensitive sensor according to any one of the first to fourth aspects, comprising a support material laminated on the surface of the flexible film.

According to the sixth aspect of the present invention, the base material and the flexible film are attached by an adhesive located at least at a part of the periphery of the pressure-sensitive ink layer, and the support material is the sensory material. A pressure-sensitive sensor according to a fifth aspect is provided, which is provided on the back side of the position where the pressure ink layer is provided and other than the pressure-sensitive adhesive region.

According to a seventh aspect of the present invention, there is provided the pressure sensitive sensor according to any one of the first to sixth aspects, wherein the flexible film is laminated on the upper layer of the base material. To do.

  According to the present invention, the pressure-sensitive ink layer and the pair of electrodes are normally separated from each other by the spacer disposed on the surface of the electrode. That is, even when the pressure-sensitive ink layer is lowered due to gravity, it is possible to prevent the electrode and the pressure-sensitive ink layer from being energized by the spacer when no load is applied. Further, even if the flexible film bends with time, the spacer is not deformed, so that the pressure-sensitive ink layer and the pair of electrodes do not come into direct contact. On the other hand, when a pressing force is applied, the pressure-sensitive ink layer and the electrode easily come into contact with each other. Therefore, the resistance value between the pressure-sensitive ink layer and the electrode can be controlled by the load, and sensing can be reliably performed even at a low load. Note that the pressure-sensitive ink layer only needs to be configured to short-circuit a pair of electrodes, and therefore does not need to be disposed so as to cover all of the electrodes, and at least partially covers a pair of electrodes simultaneously. What is necessary is just to be comprised. For example, it may be provided only at the corner of the frame-like electrode.

According to the fourth aspect of the present invention, the flexible film and the base material can be brought into contact with each other through the spacer while maintaining insulation, so that the shape of the electrode can be made arbitrary. Therefore, a transparent window part can be provided in a pressure-sensitive sensor by forming an electrode in a frame shape.

According to the fifth aspect of the present invention, by providing the support material, it is possible to prevent the load applied to the sensor from being dispersed on the pressure-sensitive adhesive side. Therefore, the load applied to the sensor can be reliably transmitted as the deflection of the flexible film, and the sensing accuracy can be improved.

  Hereinafter, a pressure sensor according to an embodiment of the present invention will be described with reference to the drawings.

  The pressure-sensitive sensor of this embodiment constitutes a touch input device 100 that is configured integrally with a touch panel. The touch input device 100 can detect the pressure intensity of the pressure sensor 120 in addition to the position detection of the touch panel 110.

  For example, the touch input device 100 suitably functions as a touch input device for a display of an electronic device having a touch panel, particularly a portable electronic device such as a mobile phone or a game machine. As shown in FIG. 2, a decoration region 101 and a transparent window portion 102 are provided. When the touch input device 100 is disposed in the display display window of the housing of the electronic device, the liquid crystal panel 130 provided below the touch input device 100 can be viewed from the transparent window portion 102. As will be described later, the decoration region 101 is formed by a decoration film 2 having a frame-shaped decoration portion 2a provided around the touch input device 100, and a portion where the decoration portion 2a is not formed is transparent. Formed as window portion 101.

  FIG. 1 is a cross-sectional view illustrating a layer configuration of the touch input device according to the present embodiment. The touch input device 100 includes an upper electrode film 20 and a lower electrode sheet 30. The upper electrode film 20 and the lower electrode sheet 30 are bonded to each other with a double-sided adhesive tape (not shown) at the peripheral edge between the electrodes via the air layer 25.

  Each of the upper electrode film 20 and the lower electrode sheet 30 is provided with a routing circuit (not shown) having a predetermined pattern such as a bus bar and a routing line on the same surface as the transparent upper electrode 3a and the transparent lower electrode 4a. To do. A spacer 4c is provided between the transparent upper electrode 3 and the transparent lower electrode 4a so that the transparent upper electrode 3 and the transparent lower electrode 4a provided on the respective facing surfaces are not in contact with each other. .

  The spacer 4c can be obtained by forming a transparent photocurable resin into fine dots by a photo process. Further, a large number of fine dots can be formed by the printing method to form the spacer 4c.

  The upper electrode film 20 has a configuration in which a decorative film 2 is attached to the back surface of a transparent hard coat film 1 with a transparent adhesive (not shown), and a transparent electrode support film 3b is laminated. A transparent upper electrode 3a and a routing circuit are formed on the lower surface of the electrode support film 3b. In addition, the decorative film 2 has a decorative layer 2 a having a transparent window portion formed on at least one surface, preferably on the surface in contact with the hard coat film 1.

  The hard coat film 1 may be transparent and may be colorless and transparent or colored and transparent. By appropriately combining the pattern of the transparent cover film and the decoration layer, the pattern of the decoration region 101 of the input device 100 can be various designs. For example, when the hard coat film 1 is colored and transparent, and the decoration layer 2a is formed of a metal layer having a metallic luster, the decoration region 101 of the input device 100 can be a tinted color having a colored metallic luster.

  As the material of the hard coat film 1, a material having excellent transparency and excellent surface abrasion resistance is used. Examples thereof include general-purpose resins such as polyethylene terephthalate, polystyrene resin, polyolefin resin, ABS resin, AS resin, acrylic resin, and AN resin. In addition, general-purpose engineering resins such as polystyrene resins, polycarbonate resins, polyacetal resins, polycarbonate modified polyphenylene ether resins, polybutylene terephthalate resins, ultrahigh molecular weight polyethylene resins, polysulfone resins, polyphenylene sulfide resins, polyphenylene oxide resins, Super engineering resins such as polyarylate resin, polyetherimide resin, polyimide resin, liquid crystal polyester resin, and polyallyl heat-resistant resin are used.

  As described above, the decorative film 2 includes the decorative region 101 of the touch input device 100 formed by the decorative portion 2a, and the portion where the decorative portion 2a is not provided becomes the transparent window portion 102 of the touch input device 1. . The decorative portion 2 is provided in a frame shape around the decorative film 2 and formed so that the transparent window portion 3 is formed in the center portion, for example, an electrode portion of the touch panel 110 or a pressure-sensitive sensor. It can also be used as a concealing part for electrodes (see FIG. 1).

  The decorative film 2 is formed by applying ink to the surface of a transparent film. As the ink constituting the decorative portion 2a, polyvinyl chloride resin, polyamide resin, polyester resin, polyacrylic resin, polyurethane resin, polyvinyl acetal resin, polyester urethane resin, cellulose ester resin, alkyd A colored ink containing a resin such as a resin as a binder and an appropriate color pigment or dye as a colorant may be used. As a method for forming the printing layer, a normal printing method such as an offset printing method, a gravure printing method, or a screen printing method may be used. In particular, the offset printing method and the gravure printing method are suitable for performing multicolor printing and gradation expression. In the case of a single color, a coating method such as a gravure coating method, a roll coating method, or a comma coating method may be employed. The printing layer may be provided entirely or partially depending on the decoration desired to be expressed.

  Moreover, the decoration part 2a may consist of what consists of a metal thin film layer, or a combination of a printing layer and a metal thin film layer. The metal thin film layer is for expressing metallic luster as the decorative portion 2a, and is formed by a vacuum deposition method, a sputtering method, an ion plating method, a plating method, or the like. In this case, a metal such as aluminum, nickel, gold, platinum, chromium, iron, copper, tin, indium, silver, titanium, lead, or zinc, or an alloy or compound thereof is used depending on the metallic luster color to be expressed. The metal thin film layer is usually formed partially. Moreover, when providing a metal thin film layer, in order to improve adhesiveness with another layer, you may provide a front anchor layer and a rear anchor layer.

  The lower electrode sheet 30 has a configuration in which a transparent lower electrode 4a and the like are formed on the surface of a transparent electrode support sheet 4b.

  As the material of the electrode support sheet 4b, a material having excellent transparency is used. For example, general-purpose resins such as polystyrene resin, polyolefin resin, ABS resin, AS resin, acrylic resin, and AN resin can be used. Also, general-purpose engineering resins such as polyphenylene oxide / polystyrene resins, polycarbonate resins, polyacetal resins, polycarbonate modified polyphenylene ether resins, polybutylene terephthalate resins, ultrahigh molecular weight polyethylene resins, polysulfone resins, polyphenylene sulfide resins, polyphenylene oxides Super-engineering resins such as resin, polyarylate resin, polyetherimide resin, polyimide resin, liquid crystal polyester resin, and polyallyl heat-resistant resin can be used.

  In FIG. 1, a transparent lower electrode 4a and an electrode are formed on the upper surface of the electrode support sheet 4b. The transparent lower electrode 4a is provided directly on the surface of the electrode support sheet 4b. However, the transparent lower electrode 4a may be formed by attaching a transparent film having a transparent electrode on the surface thereof to the electrode support sheet 4b. As the transparent resin film in this case, it is possible to use engineering plastics such as polycarbonates, polyamides, and polyether ketones, resin films such as acrylics, polyethylene terephthalates, and polybutylene terephthalates.

  The transparent lower electrode 4a and the transparent upper electrode 3a are composed of a transparent conductive film. Examples of the material for the transparent conductive film include a thin film of a metal oxide such as tin oxide, indium oxide, antimony oxide, zinc oxide, cadmium oxide, or ITO, or a conductive polymer. As a method for forming the transparent lower electrode 4a and the transparent upper electrode 3a, for example, the entire surface of the lower electrode sheet 30 or the transparent resin film 22 is electrically conductive using a vacuum deposition method, sputtering, ion plating, CVD method, roll coater method, or the like. After forming the conductive film, unnecessary portions are removed by etching. Etching is performed by forming a resist on the part to be left as an electrode by photolithography or screen method, and then immersing it in an etching solution such as hydrochloric acid or spraying the etching solution to form a conductive film on the part where the resist is not formed. Then, the resist is swelled or dissolved to be removed by dipping in a solvent. Etching with a laser is also possible.

  FIG. 3 shows a partially enlarged view of the pressure sensor of FIG. The pressure sensor 120 is disposed below the touch panel 110. The pressure-sensitive sensor 120 has a configuration in which the upper film 5 and the base material 6 are laminated with an adhesive layer 9 such as a double-sided adhesive tape. A pair of electrodes 7 a and 7 b is formed on the base material 6. The upper film 5 includes a pressure-sensitive ink layer 8 provided at a position facing the pair of electrodes 7a and 7b provided on the base material 6 and capable of simultaneously contacting both the electrodes 7a and 7b. Further, dot spacers 10 are provided on the upper surfaces of the pair of electrodes 7a and 7b.

  In the present embodiment, the thickness dimensions of the upper film 5, the substrate 6, the electrodes 7a and 7b, and the pressure-sensitive ink layer 8 are 100 μm, 35 μm, 20 μm, and 20 μm, respectively. Moreover, the thickness dimension E of a dot spacer is 4-5 micrometers. The composition constituting the pressure-sensitive ink layer 8 is a quantum tunneling composite material available under the trade name “QTC” from Peratech, UK.

  As shown in FIGS. 4A and 5, the base material 6 and the upper film 5 are each formed by punching a central portion into a frame shape, and electrodes 7 a and 7 b and a pressure-sensitive ink layer 8 are respectively formed in the frame portions. Is provided.

  Examples of the material of the base 6 include materials that can be used for the flexible substrate, for example, general-purpose resins such as polyethylene terephthalate, polystyrene resin, polyolefin resin, ABS resin, AS resin, acrylic resin, and AN resin. In addition, general-purpose engineering resins such as polystyrene resins, polycarbonate resins, polyacetal resins, polycarbonate modified polyphenylene ether resins, polybutylene terephthalate resins, ultrahigh molecular weight polyethylene resins, polysulfone resins, polyphenylene sulfide resins, polyphenylene oxide resins, Super engineering resins such as polyarylate resin, polyetherimide resin, polyimide resin, liquid crystal polyester resin, and polyallyl heat-resistant resin are used.

  As shown in FIG. 4A, the punched portion 6 a located at the center portion of the base 6 functions as a viewing window for the display device 130. The lead region 6b functions as a connection portion for drawing the pair of electrodes 7a and 7b to the outside. An adhesive layer 9 is disposed around the pair of electrodes 7 a and 7 b and is adhered to the upper film 5.

  As a material of the pair of electrodes 7a and 7b provided on the base 6, a metal such as gold, silver, copper, or nickel, or a conductive paste such as carbon is used. Examples of these forming methods include printing methods such as screen printing, offset printing, gravure printing, and flexographic printing, and a photoresist method. Alternatively, a metal foil such as copper or gold-plated copper may be attached, or an electrode pattern is formed with a resist on an FPC plated with a metal such as copper, and the portion of the metal foil that is not protected by the resist May be formed by etching.

  As shown in FIG. 4B, a plurality of dot spacers 10 arranged along the extending direction of the electrodes are provided on the surfaces of the pair of electrodes 7a and 7b provided on the base 6. The dot spacer 10 may be made of a colored resin or may be made of a transparent resin. The dot spacer 10 can be obtained by forming a photocurable resin into fine dots by a photo process. Moreover, it can also form by the screen-printing method which can make the thickness of a coating film more than fixed.

  In the present embodiment, the width dimension A of the pair of electrodes is 0.6 mm, the distance B between the electrodes is 0.2 mm, and the width dimension D of the dot spacer 10 is 30 μm.

  For the upper film 5, a material having excellent surface abrasion resistance is used. Examples thereof include general-purpose resins such as polyethylene terephthalate, polystyrene resin, polyolefin resin, ABS resin, AS resin, acrylic resin, and AN resin. In addition, general-purpose engineering resins such as polystyrene resins, polycarbonate resins, polyacetal resins, polycarbonate modified polyphenylene ether resins, polybutylene terephthalate resins, ultrahigh molecular weight polyethylene resins, polysulfone resins, polyphenylene sulfide resins, polyphenylene oxide resins, Super engineering resins such as polyarylate resin, polyetherimide resin, polyimide resin, liquid crystal polyester resin, and polyallyl heat-resistant resin are used.

  As shown in FIG. 5, the punched portion 5 a located at the central portion of the upper film functions as a viewing window of the display device 130. The pressure-sensitive ink layer 8 is a member whose electric characteristics such as an electric resistance value change according to an external force, and is provided on the upper film 5 by application. As a method for applying the pressure-sensitive ink layer 8, a printing method such as screen printing, offset printing, gravure printing, or flexographic printing can be used.

  As shown in FIG. 5, the pressure-sensitive ink layer 8 provided on the upper film does not have to be provided over the entire circumference of the frame, and if it is a position that can cover the pair of electrodes 7 a and 7 b at the same time, It may be provided so as to face only a part thereof. For example, only the corner portions of the pair of frame-like electrodes 7a and 7b shown in FIG. 4A may be provided, or they may be provided only at the positions of the sides of the pair of electrodes.

  In addition, you may provide the cover plate 11 as a support material in the upper surface of the upper film 5, as shown in FIG. As shown in FIG. 3, the address plate 11 is provided at a position where the adhesive layer 9 such as a double-sided adhesive tape is not provided. By providing the contact plate 11, it is possible to prevent the load applied to the sensor from being distributed to the adhesive side when a load is applied to the portion where the contact plate of the pressure-sensitive sensor is provided. It can be reliably transmitted as the deflection of the flexible film. Furthermore, changes due to the sag of the upper film 5 can be suppressed. Therefore, the change over time of the resistance value of the pressure-sensitive ink layer 8 due to the weight of the upper film 5 applied between the pressure-sensitive ink layer 8 and the electrodes 7a and 7b can be reduced and the accuracy can be increased. In addition, although the address plate 11 is provided on the surface of the flexible film in the above example, it may be provided on the lower surface side of the substrate 6.

  The pressure sensor 120 having the above configuration is normally in a state where the electrodes 7a and 7b and the pressure-sensitive ink layer 8 are not in contact with each other by the dot spacer 10 provided on the surfaces of the electrodes 7a and 7b. When there is a touch for input on the touch input surface of the touch panel 110 provided on the upper layer, the upper film 5 is bent downward by the load applied to the touch panel 110, and the pressure-sensitive ink layer 8 is formed on the electrode 7a. , 7b, the electrodes 7a, 7b and the pressure-sensitive ink layer 8 come into contact with each other. For this reason, a current flows through the electrodes 7a and 7b, and the pressing force of the touch input device 100 against the input surface is detected by detecting the current.

  Furthermore, when the pressing force on the input surface to the touch input device 100 is increased, the external force applied to the pressure-sensitive ink layer 8 is increased, so that the electric resistance value of the pressure-sensitive ink layer 8 is decreased, and the electrode 7a. , 7b increases in current. By detecting this change in current converted into a voltage value and detecting an external force applied to the pressure-sensitive ink layer 8, the pressing force on the input surface to the touch input device 100 can be detected.

  As shown in FIG. 6, the electrodes 7a and 7b, the pressure-sensitive ink layer 8 and the adhesive layer of the pressure sensor 120 are concealed by the decorating part 2a of the decorating film 2 of the touch panel 110, and are visible from the outside. It will never be done.

  As described above, the touch input device according to the present embodiment can detect the pressure intensity at the pressure sensor 120 in addition to the position detection at the touch panel. Furthermore, since the pressure sensor is normally in a state in which the electrodes 7a, 7b and the pressure-sensitive ink layer 8 are not in contact with each other by the dot spacers 10 provided on the surfaces of the electrodes 7a, 7b, it is normally consumed. There is no waste of power. Furthermore, the degree of contact between the electrodes 7a and 7b and the pressure-sensitive ink layer 8 does not change due to the sag of the upper film over time or the like.

  In addition, this invention is not limited to the said embodiment, It can implement in another various aspect. The shape of the spacer is not particularly limited as long as the pair of electrodes are not energized through the pressure-sensitive ink layer 8 when not pressed. For example, in the example shown in FIG. 4B, the spacers are provided on both of the pair of electrodes, but may be provided on only one of them. In this case, the pressure-sensitive ink layer is in contact with the electrode on the side where one spacer is not provided, but is insulated for the spacer when not pressed against the electrode on the side where the other spacer is provided. As a result, no current is passed between the pair of electrodes.

  Moreover, although the punching part was provided in the center part of the base | substrate 6 and the upper film 5, and the said part was comprised as a transparent window part, if the base | substrate 6 and the upper film 5 are comprised with the transparent material, a punching part will be provided. Alternatively, a translucent portion in which the pressure-sensitive ink layer and the pair of electrodes are not provided may be used as the transparent window portion.

It is sectional drawing which shows the layer structure of the touch input device concerning this embodiment. It is a schematic diagram which shows the external appearance structure of the touch input device of FIG. It is the elements on larger scale of the pressure sensor of FIG. It is a schematic diagram which shows the structure of a base material. It is the elements on larger scale of a base material. It is a schematic diagram which shows the structure of an upper film. It is a figure which shows the positional relationship of a base material, an upper film, and a decorating film.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hard coat film 2 Decorative film 3a Transparent upper electrode 3b Electrode support film 4a Transparent electrode 4b Electrode support sheet 4c Dot spacer 5 Upper film 6 Base material 7a, 7b Electrode 8 Pressure sensitive ink layer 9 Adhesive layer 10 Dot spacer 11 20 Upper electrode film 30 Lower electrode sheet 100 Touch input device 101 Decorating area 102 Transparent window portion 110 Touch panel 120 Pressure sensor 130 LCD

Claims (7)

A base material having a pair of electrodes formed on the surface;
It is possible to provide a pressure-sensitive ink layer, which is laminated on the base material and whose electric characteristics are changed by the applied pressing force, at a position where at least a part of both of the pair of electrodes provided on the base material can be covered simultaneously. A flexible film;
Have a, a spacer provided in a position opposed to the pressure sensitive ink layer on the surface of the electrode provided on the substrate,
The pair of electrodes are provided in a frame shape around the base material,
The pressure sensor , wherein the ink layer is provided on the flexible film so as to cover a corner portion of a pair of electrodes provided in a frame shape . A base material having a pair of electrodes formed on the surface;
  It is possible to provide a pressure-sensitive ink layer, which is laminated on the base material and whose electric characteristics are changed by the applied pressing force, at a position where at least a part of both of the pair of electrodes provided on the base material can be covered simultaneously. A flexible film;
  A spacer provided at a position facing the pressure-sensitive ink layer on the surface of the electrode provided on the substrate;
The pair of electrodes are provided in a frame shape around the base material,
  The pressure sensor, wherein the ink layer is provided on the flexible film over the entire circumference of a pair of electrodes provided in a frame shape. The spacer is characterized in that is provided in the form of dots on the surface of the electrode, the pressure-sensitive sensor according to claim 1 or 2. The base material and the flexible film are made of a transparent material, and a transparent window portion is formed in a portion where the pair of electrodes and the pressure-sensitive ink layer are not provided. The pressure-sensitive sensor according to any one of 1 to 3 . The pressure-sensitive sensor according to any one of claims 1 to 4 , further comprising a support member disposed on the surface of the flexible film. The base material and the flexible film are attached by an adhesive located at least part of the periphery of the pressure-sensitive ink layer, and the support material has a position where the pressure-sensitive ink layer is provided. The pressure-sensitive sensor according to claim 5 , wherein the pressure-sensitive sensor is provided on a back surface side and other than an adhesive region by the adhesive. Wherein the flexible film is characterized by being stacked on the upper layer of the substrate, pressure-sensitive sensor according to any one of claims 1 6.

Images