JP6879826B2 - Touch sensor - Google Patents

Description

The present invention relates to a touch sensor having a press detection function.

In recent years, touch sensors have been introduced into electronic devices such as smartphones and tablets, and are used as intuitive human-machine interfaces. The touch sensor detects the two-dimensional position touched by a finger or a pen. The electronic device is operated by detecting the touched position according to the display.

Further, a touch sensor for detecting a pressing force has been developed and disclosed for the purpose of increasing input information and improving operability. For example, there are a method of detecting a pressing force by a change in capacitance when the housing is distorted, a change in resistance value using a pressure-sensitive rubber, and a method of detecting a change in electric charge of a piezoelectric material. As a technique for utilizing a piezoelectric material, various materials such as those using an inorganic lead zirconate titanate (PZT) and organic polyvinylidene fluoride and polylactic acid are used.

As a piezoelectric film for a touch panel capable of detecting the pressure (Z coordinate) touched by a finger, for example, Patent Document 1 (Japanese Patent Laid-Open No. 2010-26938) is described. In the touch panel of Patent Document 1, a laminate in which transparent electrodes are laminated on both sides of a piezoelectric layer containing a polyvinylidene fluoride-ethylene tetrafluoride copolymer is used. The piezoelectric layer containing the polyvinylidene fluoride-ethylene tetrafluoride copolymer is described to be produced by a casting method or an extrusion method, and is a single film. The thickness of the piezoelectric layer is 20 μm to 300 μm. In the example of the piezoelectric layer containing the polyvinylidene fluoride-ethylene tetrafluoride copolymer having a thickness of 20 μm to 100 μm, the total light transmittance was 95% and the haze value (cloudiness value) was 5% to 7%. is there.

In order not to impair the visibility of the image on the display on the back of the touch panel, the haze value is preferably less than 5%, and it is necessary to further reduce the haze value. In addition, organic piezoelectric films are generally expensive in terms of material cost and processing cost, and further cost reduction is required for use in touch sensor applications.

A touch sensor with high detection accuracy has been proposed by using a capacitance method having high detection sensitivity for touch position detection and using a transparent organic piezoelectric film for indentation pressure detection (see Patent Document 2). However, since it is formed by laminating the capacitance sensor base material and the piezoelectric film, there are problems that the cost increases due to the increase in the number of members and the thickness of the touch sensor increases.

JP 2010-26938 Patent 5722954

An object of the present invention is to provide a touch sensor which has achieved improvement in total light transmittance and haze, thinning by reducing the number of members, and cost reduction as compared with the prior art.

The touch sensor of the present invention includes a piezoelectric sensor and a capacitance sensor. The piezoelectric sensor includes a piezoelectric film in which a coating layer having piezoelectric properties is laminated on a base film.

Transparent electrodes are arranged on one side and the other side of the piezoelectric film. The transparent electrode includes a transparent electrode used only for the piezoelectric sensor, a transparent electrode used only for the capacitance sensor, and a transparent electrode used for both the piezoelectric sensor and the capacitance sensor. Select the transparent electrodes to be laminated at the time of manufacture according to the type of touch sensor.

The thickness of the piezoelectric coating layer is 0.5 μm or more and 20 μm or less. Further, the piezoelectric coating layer contains a fluororesin. Further, the fluororesin is a copolymer of two or more of vinylidene fluoride, trifluoroethylene, and chlorotrifluorotilene, or a polymer of vinylidene fluoride.

At least one undercoat layer, a refractive index adjusting layer, an optical adjusting layer, and an anti-blocking layer is provided between the base film and the piezoelectric coating layer. Alternatively, a coating layer having piezoelectricity may be directly formed on the base film.

The thickness of the coating layer is 0.5 to 10 μm, the thickness of the refractive index adjusting layer is 80 to 160 nm, and the thickness of the transparent electrode is 20 nm or more. The refractive index of the coating layer is 1.40 to 1.50, the refractive index of the refractive index adjusting layer is 1.50 to 1.70, and the refractive index of the transparent electrode is 1.90 to 2.10.

At least one undercoat layer, a refractive index adjusting layer, an optical adjusting layer, and an anti-blocking layer is provided between the piezoelectric film and the transparent electrode. Alternatively, the transparent electrode may be directly formed on the piezoelectric film.

A transparent packing layer is laminated on the piezoelectric film and the transparent electrode. When the transparent electrode is not directly laminated on the piezoelectric film, a laminate in which the transparent electrode is formed on the base film may be prepared, and the laminate and the piezoelectric film may be laminated via the transparent packing layer.

The base film is selected from at least one of polyethylene terephthalate, cycloolefin copolymer, polycycloolefin, polyethylene naphthalate, and polycarbonate.

The transparent electrode is a transparent electrode containing indium oxide as a main component.

In the touch sensor of the present invention, a coating layer having piezoelectricity is formed on the base film, and the coating layer can be made thin. Since the coating layer is thin, it does not easily deteriorate the total light transmittance and haze.

It is a figure which shows typically the structure of the touch sensor of this invention. It is a perspective view which disassembled the touch sensor of FIG. 1 for each component. It is a figure which shows the other structure of the capacitance sensor schematically. It is a figure which shows typically the structure of the touch sensor which concerns on Embodiment 2 of this invention. It is a figure which shows typically the structure of the touch sensor which concerns on Embodiment 3 of this invention. It is a figure which shows typically the structure of the touch sensor which concerns on Embodiment 4 of this invention. It is a figure which shows typically the structure of the touch sensor which concerns on Embodiment 5 of this invention. It is a figure which shows typically the structure of the touch sensor which concerns on Embodiment 6 of this invention. It is a figure which shows typically the structure of the touch sensor which concerns on Embodiment 7 of this invention. It is a figure which shows typically the structure of the touch sensor which concerns on Embodiment 8 of this invention. It is a figure which shows typically the structure of the touch sensor which concerns on Embodiment 9 of this invention. It is a figure which shows typically the structure of the touch sensor which concerns on Embodiment 10 of this invention. It is a figure which shows typically the structure of the touch sensor which concerns on Embodiment 11 of this invention. It is a figure which shows typically the structure of the touch sensor which concerns on Embodiment 12 of this invention. It is a figure which shows typically the structure of the touch sensor which concerns on Embodiment 13 of this invention. It is a figure which shows typically the structure of the touch sensor which concerns on Embodiment 14 of this invention. It is a figure which shows typically the structure of the touch sensor which concerns on Embodiment 15 of this invention. It is a figure which shows typically the structure of the touch sensor which concerns on Embodiment 16 of this invention. It is a figure which shows typically the other structure of the touch sensor which concerns on Embodiment 16 of this invention. It is a figure which shows typically the structure of the touch sensor which concerns on Embodiment 17 of this invention. It is a figure which shows typically the structure of the touch sensor which concerns on Embodiment 18 of this invention. It is a figure which shows typically the structure of the touch sensor of the comparative example. It is a figure which shows typically the structure which carried out Examples 4-10.

The touch sensor of the present invention will be described with reference to the drawings. If the configuration described in one embodiment has the same configuration in another embodiment, the description of the configuration may be omitted and the same reference numerals may be given to the drawings.

[Embodiment 1]
The touch sensor 10 of the present invention shown in FIGS. 1 and 2 is arranged on a display surface of a display. The touch sensor 10 of the present invention includes a piezoelectric sensor 11 and a capacitance sensor 12. The piezoelectric sensor 11 detects the pressing force by a piezoelectric method. The capacitance sensor 12 detects the pressed position (X coordinate and Y coordinate) by the capacitance method. The piezoelectric sensor 11 and the capacitance sensor 12 are adhered to each other by a transparent packing layer 13.

[Piezoelectric sensor]
The piezoelectric sensor 11 is a piezoelectric film 16 which is a first laminated body composed of a first base film 14 and a coating layer 15 having piezoelectricity, a first transparent electrode 17 formed on one surface of the piezoelectric film 16, and a piezoelectric film 13. A second transparent electrode 18 formed on the other surface is provided. When the touch sensor 10 is pressed, the piezoelectric coating layer 15 is polarized, and the pressing force can be detected by detecting the change in the potential at that time with the transparent electrodes 17 and 18.

[Capacitance sensor]
The capacitance sensor 12 is arranged on one side of the piezoelectric sensor 13. The capacitance sensor 12 is a second laminated body 21 having a third transparent electrode 20 formed on one surface of a second base film 19, and a third laminated body having a fourth transparent electrode 23 formed on one surface of a third base film 22. A transparent packing layer 25 for adhering the body 24, the second laminated body 21 and the third laminated body 24 is provided. The transparent electrodes 20 and 24 are insulated from each other. In the capacitance sensor 12, when a finger or a pen touches or approaches the touch sensor 10, the capacitance at that position changes, and the potentials of the transparent electrodes 20 and 24 at that position change, and the potential changes. The touch position can be detected by.

[Base film]
The first and second and third substrate films 14, 19 and 22 are, for example, polyethylene terephthalate, cycloolefin polymer, polyethylene naphthalate, polyolefin, polycycloolefin, polycarbonate, polyether sulfone, polyarylate, polyimide, polyamide, polystyrene. , Polymer films such as polynorbornen. The base films 14, 19 and 22 are preferably polyethylene terephthalate films (PET films) having excellent transparency, heat resistance and mechanical properties, but are not limited thereto. Further, films of different materials may be laminated to form one base film.

The thickness of each of the base films 14, 19 and 22 is preferably 10 μm or more and 150 μm or less, but is not limited thereto. However, if the thicknesses of the base films 14, 19 and 22 are less than 10 μm, handling may become difficult. Further, if the thicknesses of the base films 14, 19 and 22 exceed 150 μm, it may be difficult to wind the piezoelectric film 16, the second laminated body 21 and the third laminated body 24 into a roll.

[Piezoelectric coating layer]
The piezoelectric coating layer 15 is a thin film coated on any surface of the first base film 14. The piezoelectric coating layer 15 is not particularly limited as long as the film after coating has piezoelectricity. The coating layer 15 having piezoelectricity is preferably one that exhibits piezoelectricity without polling (polarization treatment), but may be one that exhibits piezoelectricity after polling.

Two types of polling are known: a non-contact type by corona discharge treatment polarization and a contact type in which a film is sandwiched between two metal plates and a voltage is applied to polarize the polling.

The piezoelectric coating layer 15 is formed, for example, by dissolving the material of the coating layer 15 in a solvent to prepare a solution, and thinly and uniformly on the first base film 14 by a known coating device such as a bar coater or a gravure coater. Obtained by coating and then drying.

[Piezoelectric coating layer material]
As the material of the coating layer 15 having piezoelectricity, for example, a material containing a fluororesin is preferably used. Specific examples of the material containing a fluororesin include polyvinylidene fluoride, which is a polymer containing a vinylidene fluoride component, a copolymer of vinylidene fluoride-trifluoroethylene, and vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene. Polymer, hexafluoropropylene-vinylidene fluoride copolymer, perfluorovinyl ether-vinylidene fluoride copolymer, tetrafluoroethylene-vinylidene fluoride copolymer, hexafluoropropylene oxide-vinylidene fluoride copolymer It can be selected from a coalescence, a copolymer of hexafluoropropylene oxide-tetrafluoroethylene-vinylidene fluoride, and a copolymer of hexafluoropropylene-tetrafluoroethylene-vinylidene fluoride. And these polymers can be used alone or in admixture. More preferably, it is a copolymer of vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene, a copolymer of vinylidene fluoride-trifluoroethylene, or a polymer of vinylidene fluoride.

When a copolymer of vinylidene fluoride-trifluoroethylene is used as the material of the coating layer 15, the molar ratio of vinylidene fluoride to trifluoroethylene is 100 as a whole, and (50 to 85) :( 50 to 15) is appropriate. Is. When a copolymer of vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene is used as the material of the coating layer 15, the molar ratio of vinylidene fluoride, trifluoroethylene and chlorotrifluoroethylene is 100 as a whole. 63 to 65) :( 27 to 29): (10 to 6) are appropriate.

[Thickness of coating layer with piezoelectricity]
The thickness of the piezoelectric coating layer 15 after drying is not limited, but considering the optical characteristics described later, 0.5 μm or more and 20 μm or less are appropriate, but 0.5 to 10 μm is more suitable. It is preferable, and 0.5 to 5 μm is more preferable. If the thickness of the piezoelectric coating layer 15 after drying is less than 0.5 μm, the formed film may be incomplete. If the thickness of the piezoelectric coating layer 15 after drying exceeds 20 μm, the optical characteristics (haze and total light transmittance) may become inappropriate.

[Optical characteristics of piezoelectric film]
Since the image on the display must be clearly visible, the haze value of the piezoelectric film 16 is preferably less than 5%, and the total light transmittance is preferably 90% or more. If the haze value of the piezoelectric film 16 is 5% or more, or if the total light transmittance is less than 85%, the image on the display may not be clearly visible.

[Transparent electrode]
The first and second transparent electrodes 17 and 18 are electrodes for detecting the pressing force, and the third and fourth transparent electrodes 20 and 23 are electrodes for detecting the pressing position.

The first transparent electrode 17 covers the entire surface of the piezoelectric film 16, and the second transparent electrode 18 covers the entire other surface of the piezoelectric film 16. When the touch sensor 10 is pressed, the piezoelectric coating layer 15 is polarized. At that time, the change in the potential of the piezoelectric coating layer 15 is detected by the first and second transparent electrodes 17 and 18. For example, the second transparent electrode 18 is set to a reference potential (earth potential), and the first transparent electrode 17 detects a change in potential.

As shown in FIGS. 1 and 2, the third transparent electrode 20 and the fourth transparent electrode 23 are arranged on one surface side of the piezoelectric sensor 11. These transparent electrodes 20 and 23 are a part of the capacitance sensor 12. As shown in FIG. 1, the third transparent electrode 20 and the fourth transparent electrode 23 are insulated by having a second base film 19 and a transparent packing layer 25 between them. Further, as shown in FIG. 2, the third and fourth transparent electrodes 20 and 23 have a band shape, and the electrodes 20 and 23 are oriented in a direction orthogonal to each other. For example, the third transparent electrode 20 detects the X coordinate of the pressing position, and the fourth transparent electrode 23 serves as an electrode for detecting the Y coordinate. By pressing or approaching the surface of the touch sensor 10 with a finger or a pen, the potentials of the third and fourth transparent electrodes 20 and 23 at that positions change, and the X and Y coordinates are detected using the changes in the potentials. To do.

In the capacitance sensor 12 of FIG. 1, the third transparent electrode 20 is laminated on one surface of the second base film 19, and the fourth transparent electrode 23 is laminated on one surface of the third base film 22. Not limited to. For example, as shown in FIGS. 27, 28, and 29 of the capacitance sensors 27, 28, and 29 of FIGS. The laminated bodies 21 and 24 may be adhered by the transparent packing layer 25. Further, although the second laminated body 21 is arranged above the third laminated body 24, it may be arranged in reverse.

Examples of the transparent electrodes 17, 18, 20, and 23 include indium-based composite oxides, typically indium tin oxide (ITO: Indium Tin Oxide), and indium zinc composite oxides, which are tetravalent metal ions or Examples thereof include indium oxide (In203) doped with divalent metal ions. The indium-based composite oxide is characterized by having a high transmittance of 80% or more in the visible light region (380 to 780 nm) and a low surface resistance per unit area (30 to 1000 Ω / □ (ohms per square)). doing.

The thickness of the indium-based composite oxide is preferably 35 nm or less. This is because if the thickness becomes too thick, the transmittance in the visible light region and the like deteriorate. The surface resistance value of the indium-based composite oxide is preferably 300 Ω / □ or less, and more preferably 150 Ω / □ or less. This is because when the surface resistance value becomes high, it does not function as an electrode.

A transparent electrode having a low surface resistance is formed by forming an amorphous layer of an indium-based composite oxide on a base film by, for example, a sputtering method or a vacuum vapor deposition method, and then heat-treated at 80 to 200 ° C. to form an amorphous layer. It is obtained by changing the quality layer into a crystalline layer.

The transparent electrodes 17, 18, 20, and 23 are not limited to the above materials, and are transparent conductive oxides such as tin zinc oxide, zinc oxide, and fluorine-doped tin oxide, and conductive polymers such as polyethylene dioxythiophene. Can be used.

When polling the piezoelectric coating layer 15, the polling may be performed after the first and second transparent electrodes 17 and 18 are formed, or the coating may be performed before the first and second transparent electrodes 17 and 18 are formed. You may poll the layer. When the first and second transparent electrodes 17 and 18 are formed by sputtering, either polling or sputtering may come first.

[Interlayer]
Between the first base film 14 and the piezoelectric coating layers 15, the first, second and third base films 14, 19, 22 and the first, third and fourth transparent electrodes 17, 20, 23. A thin layer having a thickness of several nm to several tens of nm, such as an undercoat layer and an index matching layer (optical adjustment layer), may be provided. The undercoat layer enhances the adhesion between layers, and the refractive index adjusting layer adjusts the reflectance. Further, an anti-blocking layer may be provided between the base films 14, 19, 22 and the transparent electrodes 17, 20, 23. The anti-blocking layer has the effect of preventing the stacked films from being crimped (blocking).

[Transparent packing layer]
The transparent packing layers 13 and 25 fill the layers without forming an air layer. The surfaces of the first and fourth transparent electrodes 17 and 23 are covered with the transparent packing layers 13 and 25. This is to prevent the total light transmittance and haze from being lowered due to reflection by the surfaces of the first and fourth transparent electrodes 17 and 23 and scattering caused by fine irregularities.

The transparent packing layers 13 and 25 use an adhesive or resin made of an optically transparent adhesive material or an optically transparent adhesive material. The transparent packing layers 13 and 25 may be formed by laminating the optical transparent adhesive material or the optical transparent adhesive material in the form of a sheet, or the liquid optical transparent adhesive material or the optical transparent adhesive material may be applied and irradiated with ultraviolet rays. Then, the transparent packed layers 13 and 25 may be formed by curing.

[display]
The touch sensor 10 is arranged on the front surface of the display. As the display, a flat display such as a liquid crystal display or an organic EL display can be used. The capacitance sensor 12 for detecting the pressing position is arranged above (touching side) the piezoelectric sensor 11. The first and second transparent electrodes 17 and 18 are formed so as to cover the piezoelectric film 16, and when the piezoelectric sensor 11 is arranged above the capacitance sensor 12, the third and fourth transparent electrodes 20 and This is because the 23 cannot detect the change in capacitance. The touch sensor 10 and the display are adhered with a transparent packing layer. As the transparent packing layer, the above-mentioned optical transparent adhesive material or optical transparent adhesive material can be used.

As described above, in the present invention, the coating layer 15 having piezoelectricity is formed on the first base film 14, and the thickness of the piezoelectric material can be made thinner than before. Since the piezoelectric coating layer 15 is thin, it is unlikely to deteriorate the total light transmittance and haze. Therefore, the touch sensor 10 having good optical characteristics can be realized.

[Embodiment 2]
In the touch sensor 10 of FIG. 1, the direction of the piezoelectric film 16 is arbitrary. As in the touch sensor 30 of FIG. 4, the piezoelectric coating layer 15 may be arranged on the upper side of the first base film 14.

Although the touch sensor 30 of FIG. 4 has changed the direction of the piezoelectric film 16 with respect to the touch sensor 10 of FIG. 1, the direction of the piezoelectric sensor 11 may be changed. The second transparent electrode 18 is adhered to the transparent packing layer 13, and the second transparent electrode 18, the piezoelectric sensor 11, and the first transparent electrode 17 are arranged in this order from the top.

[Embodiment 3]
It is not necessary to directly form the second transparent electrode 18 on the piezoelectric film 16 as in the piezoelectric sensor 41 of the touch sensor 40 in FIG. 5 (a). A fourth laminated body 43 in which the second transparent electrode 18 is laminated on the fourth base film 42 is prepared, and the piezoelectric film 16 and the fourth laminated body are adhered by the transparent packing layer 44. The fourth base film 42 can be made of the same material as the first base film 14 and the like. Further, the transparent packed layer 44 can be made of the same material as other transparent packed layers 13 and the like.

The direction of the fourth laminated body 43 is not limited. In the piezoelectric sensor 41 of the touch sensor 40 of FIG. 5A, the second transparent electrode 18 is adhered to the transparent packing layer 44. The fourth base film 42 may be adhered to the transparent packing layer 44 as in the piezoelectric sensor 46 of the touch sensor 45 in FIG. 5 (b).

Further, this embodiment can be applied to the touch sensor 30 of FIG. In the touch sensor 30, the second transparent electrode 18 is not directly formed on the first base film 14, but the fourth laminated body 43 is prepared, and the first base film and the fourth laminated body 43 are adhered by the transparent packing layer 44. To do. The direction of the fourth laminated body 43 is not limited, and either the second transparent electrode 18 or the fourth base film 42 may be adhered to the transparent packing layer 44.

[Embodiment 4]
It is not necessary to directly form the first transparent electrode 17 on the piezoelectric film 16 as in the piezoelectric sensor 51 of the touch sensor 50 of FIG. 6A. A fifth laminated body 53 in which the first transparent electrode 17 is laminated on the fifth base film 52 is prepared, and the piezoelectric film 16 and the fifth laminated body 53 are adhered to each other by the transparent packing layer 54. The fifth base film 52 can be made of the same material as the first base film 14 and the like. Further, the transparent packed layer 54 can be made of the same material as other transparent packed layers 13 and the like.

The direction of the fifth laminated body 53 is not limited. In the piezoelectric sensor 51 of the touch sensor 50 of FIG. 6A, the fifth base film 52 is adhered to the transparent packing layer 54. The first transparent electrode 17 may be adhered to the transparent packing layer 54 as in the piezoelectric sensor 56 of the touch sensor 55 of FIG. 6B.

Further, this embodiment can be applied to the touch sensor 30 of FIG. In the touch sensor 30, the first transparent electrode 17 is not directly formed on the piezoelectric coating layer 15, but the fifth laminated body 53 is prepared, and the piezoelectric coating layer 15 and the fifth laminated body 53 are transparently packed. Adhere by 54. The direction of the fifth laminated body 53 is not limited, and either the first transparent electrode 17 or the fifth base film 52 may be adhered to the transparent packing layer 54.

[Embodiment 5]
The piezoelectric sensor 61 of the touch sensor 60 of FIG. 7 has a configuration in which the piezoelectric film 16, the fourth laminated body 43, and the fifth laminated body 53 are bonded by the transparent packing layers 44 and 54. The piezoelectric sensor 61 has a configuration in which the piezoelectric sensor 41 of FIG. 5 and the piezoelectric sensor 51 of FIG. 6 are combined.

In the piezoelectric sensor 61, the directions of the piezoelectric film 16, the fourth laminated body 43, and the fifth laminated body 53 are arbitrary. The positions of the first base film 14 and the piezoelectric coating layer 15, the positions of the second transparent electrode 18 and the fourth base film 42, and the positions of the first transparent electrode 17 and the fifth base film 52 are interchanged. Is also good. Therefore, the piezoelectric sensor 61 has eight configurations.

[Embodiment 6]
In the capacitance sensor 71 of the touch sensor 70 of FIG. 8, the third transparent electrode 20 is formed on one surface of the sixth base film 72, and the fourth transparent electrode 23 is formed on the other surface of the sixth base film 72. ing. As the sixth base film 72, the same one as the first base film 14 or the like can be used. Although the fourth transparent electrode 23 is adhered to the transparent packing layer 13 in FIG. 8, the third transparent electrode 20 may be adhered to the transparent filling layer 13.

The capacitance sensor 71 of FIG. 8 has a smaller number of base films and a smaller number of transparent packing layers than the capacitance sensor 12 of FIG. Therefore, the touch sensor 70 can be made thinner.

The capacitance sensor 12 used in the touch sensors 10, 30, 40, 45, 50, 55, 60 described in the first to sixth embodiments can be changed to the capacitance sensor 71.

[Embodiment 7]
In the capacitance sensor 81 of the touch sensor 80 of FIG. 9A, a third'transparent electrode 82 and a fourth'transparent electrode 83 are formed on one surface side of the sixth base film 72. The 3'transparent electrode 82 and the 4'transparent electrode 83 are made of the same material as the 3rd transparent electrode 20 and the 4th transparent electrode 23.

As shown in FIG. 9B, a plurality of rectangular portions 85 and 86 are arranged in the third'transparent electrode 82 and the fourth'transparent electrode 83, respectively, and the rectangular portions 85 and 86 are in the X direction. Alternatively, they are connected by linear portions 87 and 88 in the Y direction. Therefore, the 3'transparent electrode 82 and the 4'transparent electrode 83 are oriented in directions orthogonal to each other. The rectangular portions 85 and 86 have shapes such as a rhombus, a square, and a hexagon. The third'transparent electrode 82 and the fourth'transparent electrode 83 intersect with each other via an insulator 84 so as not to cause a short circuit.

In FIG. 9, the 3'transparent electrode 82 intersects the 4'transparent electrode 83, but the 4'transparent electrode 83 may intersect the 3'transparent electrode 82. good. The direction of the capacitance sensor 81 is not limited, and the transparent electrodes 82 and 83 may be adhered to the transparent packing layer 13.

The capacitance sensor 12 used in the touch sensors 10, 30, 40, 45, 50, 55, 60 described in the first to sixth embodiments can be changed to the capacitance sensor 81.

[Embodiment 8]
The capacitance sensor is not limited to a configuration in which two transparent electrodes 20 and 23 detect a change in capacitance. The capacitance sensor 91 of the touch sensor 90 of FIG. 10 includes rectangular transparent electrodes 92 arranged vertically and horizontally on one surface of the sixth base film 72. The lead wire 93 is connected to the rectangular transparent electrode 92. The rectangular transparent electrode 92 and the lead wiring 93 are made of the same material as the third transparent electrode 20 and the fourth transparent electrode 23.

The capacitance sensor 12 used in the touch sensors 10, 30, 40, 45, 50, 55, 60 described in the first to sixth embodiments can be changed to the capacitance sensor 91.

[Embodiment 9]
The present application is not limited to a form in which the capacitance sensor and the piezoelectric sensor are completely separated. For example, the touch sensor 100 of FIG. 11A omits the first transparent electrode 17 as compared with the touch sensor 10 of FIG. The fourth transparent electrode 23 arranged on one side of the piezoelectric film 16 is an electrode that detects the coordinates of the touch position by the capacitance method, and detects the potential when the piezoelectric coating layer 15 is polarized. It is an electrode for. The fourth transparent electrode 23 also has the function of the first transparent electrode 17 of the above embodiment.

The touch sensor 100 can drive the piezoelectric sensor 101 and the capacitance sensor 12. When the piezoelectric sensor 101 operates, the fourth transparent electrode 23 and the second transparent electrode 18 are used. When the capacitance sensor 12 operates, the third transparent electrode 20 and the fourth transparent electrode 23 are used. The method of detecting the potential at each of the electrodes 18, 20 and 23 when the piezoelectric sensor 101 and the capacitance sensor 12 are driven is the same as the method of the above embodiment. If the fourth transparent electrode 23 is used in the piezoelectric sensor 101 and the capacitance sensor 12, the driving method of the piezoelectric sensor 101 and the capacitance sensor 12 is not limited.

Like the touch sensor 102 in FIG. 11 (b), the piezoelectric sensor 103 may have the positions of the coating layer 15 and the first base film 14 which have piezoelectricity as compared with those in FIG. 11 (a).

The touch sensors 100 and 102 omit the first transparent electrode 17 as compared with the touch sensor 10 of FIG. 1, and the touch sensors 100 and 102 can be made thinner.

[Embodiment 10]
Further, the second transparent electrode 18 may not be directly formed on the piezoelectric film 16 as in the piezoelectric sensor 111 of the touch sensor 110 shown in FIG. 12 (a). Similar to the piezoelectric sensors 41 and 46 of FIG. 5, the piezoelectric sensor 111 prepares a fourth laminated body 43 in which the second transparent electrode 18 is laminated on any surface of the fourth base film 42, and the transparent packing layer 44 is used. The fourth laminated body 43 and the piezoelectric film 16 are adhered to each other.

Similar to the touch sensors 100 and 102 of FIG. 11, in the touch sensor 110, the fourth transparent electrode 23 is used for the capacitance sensor 12 and the piezoelectric sensor 111. If the fourth transparent electrode 24 is used in the capacitance sensor 12 and the piezoelectric sensor 111, the driving method of the capacitance sensor 12 and the piezoelectric sensor 111 is not limited. When the capacitance sensor 12 is driven, the third transparent electrode 20 and the fourth transparent electrode 23 are used. When the piezoelectric sensor 111 is driven, the second transparent electrode 18 and the fourth transparent electrode 23 are used.

As in the piezoelectric sensor 113 of the touch sensor 112 of FIG. 12B, the direction of the fourth laminated body 43 may be changed with respect to the piezoelectric sensor 111. The fourth base film 43 is adhered to the transparent packing layer 44.

Further, the piezoelectric sensors 111 and 113 of FIGS. 12A and 12B can change the direction of the piezoelectric film 16. In FIG. 12, the piezoelectric coating layer 15 is on the first base film 14, but the first base film 14 may be on the piezoelectric coating layer 15.

[Embodiment 11]
The fourth transparent electrode 23 may be directly formed on the piezoelectric film 16 as in the touch sensor 120 of FIG. 13 (a). The fourth transparent electrode 23 is laminated on one surface of the piezoelectric film 16, and the second transparent electrode 18 is laminated on the other surface of the piezoelectric film 16. The third transparent electrode 20 to the fourth transparent electrode 23 are 121, and the fourth transparent electrode 23 to the second transparent electrode 18 are piezoelectric sensors 122.

In the touch sensor 120, the fourth transparent electrode 23 is used in the capacitance sensor 121 and the piezoelectric sensor 122, as in the touch sensors 100, 102, 110, 112 of FIGS. 11 and 12.

As in the piezoelectric sensor 124 of the touch sensor 123 in FIG. 13B, the direction of the piezoelectric film 16 may be changed as compared with the piezoelectric sensor 122. In the piezoelectric sensor 124, the fourth transparent electrode 23 is laminated on the piezoelectric coating layer 15, and the second transparent electrode 18 is laminated on the first base film 14.

[Embodiment 12]
Like the piezoelectric sensor 131 of the touch sensor 130 in FIG. 14A, the second transparent electrode 18 may not be directly formed on the piezoelectric film 16. Similar to the piezoelectric sensors 41 and 46 of FIG. 5, the piezoelectric sensor 131 prepares a fourth laminated body 43 in which the second transparent electrode 18 is laminated on any surface of the fourth base film 42, and prepares a fourth laminated body 43, and the transparent packing layer 44 The fourth laminated body 43 and the piezoelectric film 16 are adhered to each other.

Further, the direction of the piezoelectric film 16 may be changed as in the piezoelectric sensor 133 of the touch sensor 132 of FIG. 14B. The fourth transparent electrode 23 is laminated on the piezoelectric coating layer 15.

Further, in the piezoelectric sensors 131 and 133 of FIG. 14, the direction of the fourth laminated body 43 may be changed. The fourth base film 42 of the fourth laminated body 43 is adhered to the transparent adhesive layer 44.

[Embodiment 13]
In the 11th and 12th embodiments, the capacitance sensor 71 shown in FIG. 8 may be used. Like the touch sensor 140 in FIG. 15A, the capacitance sensor 71 in which the third transparent electrode 20 is laminated on one surface of the sixth base film 72 and the fourth transparent electrode 23 is laminated on the other surface is used. In the piezoelectric sensor 141, the second transparent electrode 18 is laminated on the other surface of the piezoelectric film 16, and one surface is adhered to the transparent packing layer 25. The transparent packing layer 25 is adhered to the fourth transparent electrode 23, and the fourth transparent electrode 23 to the second transparent electrode 18 are the piezoelectric sensors 141.

Also in this embodiment, if the fourth transparent electrode 23 is used for the capacitance sensor 71 and the piezoelectric sensor 141, the driving method of the capacitance sensor 71 and the piezoelectric sensor 141 is not limited.

Further, as in the piezoelectric sensor 143 of the touch sensor 142 in FIG. 15B, the second transparent electrode 18 is laminated on the first base film 14, and the piezoelectric coating layer 15 is adhered to the transparent packing layer 25. You may.

Further, the second transparent electrode 18 is not directly formed on the piezoelectric film 16, and the fourth laminated body 43 in which the second transparent electrode 18 is laminated on the fourth base film 42 is formed as in the touch sensors 130 and 132 of FIG. The piezoelectric film 16 and the fourth laminated body 43 may be bonded to each other by the transparent packing layer 44. The surface of the fourth laminated body 43 to be adhered to the transparent packing layer 44 is not limited.

[Embodiment 14]
As in the touch sensor 150 of FIG. 16A, the capacitance sensor 81 of FIG. 9 may be used. The second transparent electrode 18 is laminated on the piezoelectric coating layer 15 of the piezoelectric film 16, and the first base film 14 and the sixth base film 72 are adhered to each other by the transparent packing layer 13. The piezoelectric sensor 151 is from the second transparent electrode 18 to the fourth'transparent electrode 83 of the capacitance sensor 81.

If the 4'transparent electrode 83 is used for the capacitance sensor 81 and the piezoelectric sensor 151, the driving method of the capacitance sensor 81 and the piezoelectric sensor 151 is not limited.

Further, as in the piezoelectric sensor 153 of the touch sensor 152 in FIG. 16B, the second transparent electrode 18 is laminated on the first base film 14, and the piezoelectric coating layer 15 is adhered to the transparent packing layer 13. You may.

Further, the second transparent electrode 18 is not directly formed on the piezoelectric film 16, and the fourth laminated body 43 in which the second transparent electrode 18 is laminated on the fourth base film 42 is formed as in the touch sensors 130 and 132 of FIG. The piezoelectric film 16 and the fourth laminated body 43 may be bonded to each other by the transparent packing layer 44. The surface of the fourth laminated body 43 to be adhered to the transparent packing layer 44 is not limited.

[Embodiment 15]
A capacitance sensor 161 such as the touch sensor 160 of FIG. 17A may be used. The capacitance sensor 161 has transparent electrodes 82 and 83 in two directions of the capacitance sensor 81 shown in FIG. 9 formed on one surface side of the piezoelectric film 16. For convenience of explanation, the capacitance sensor 161 is located above the film 161 in terms of pressure, but the capacitance sensor 161 may be located above the 4'transparent electrode 83.

The piezoelectric sensor 162 of the touch sensor 160 has a 4'transparent electrode 83 formed on one surface of the piezoelectric film 16 and a second transparent electrode 18 formed on the other surface.

Similar to the touch sensors 150 and 152 of FIG. 16, if the 4'transparent electrode 83 is used for the capacitance sensor 81 and the piezoelectric sensor 151, the driving method of the capacitance sensor 81 and the piezoelectric sensor 151 is not limited.

Further, as in the piezoelectric sensor 165 of the touch sensor 164 in FIG. 17B, the second transparent electrode 18 is laminated on the first base film 14, and the piezoelectric coating layer 15 is adhered to the transparent packing layer 13. You may.

Further, the second transparent electrode 18 is not directly formed on the piezoelectric film 16, but a fourth laminated body 43 in which the second transparent electrode 18 is laminated on the fourth base film 42 is prepared and transparently filled as in the above embodiment. The piezoelectric film 16 and the fourth laminated body 43 may be adhered by the layer 44. The surface of the fourth laminated body 43 to be adhered to the transparent packing layer 44 is not limited.

[Embodiment 16]
The transparent electrodes on one side and the other side of the piezoelectric film 16 may be used in both the capacitance sensor and the piezoelectric sensor. For example, as in the touch sensor 170 of FIG. 18, the third transparent electrode 20 may be laminated on one surface of the piezoelectric film 16 and the fourth transparent electrode 23 may be laminated on the other surface of the piezoelectric film 16.

The third transparent electrode 20 and the fourth transparent electrode 23 are electrodes that detect the coordinates of the touch position by the capacitance method, and are electrodes for detecting the potential when the piezoelectric coating layer 15 is polarized. is there. If the third transparent electrode 20 and the fourth transparent electrode 23 are used for the capacitance sensor 171 and the piezoelectric sensor 172, the driving method of the capacitance sensor 170 and the piezoelectric sensor 172 is not limited. When the capacitance sensor 171 is driven, changes in capacitance are detected by the transparent electrodes 20 and 23. When the piezoelectric sensor 172 is driven, one of the transparent electrodes 20 and 23 becomes the ground potential, and the other electrodes 23 and 20 detect a change in the potential due to the polarization of the coating layer 15.

The vertical direction of the piezoelectric sensor 16 is arbitrary. The fourth transparent electrode 23 may be laminated on the first base film 14, and the third transparent electrode 20 may be laminated on the piezoelectric coating layer 15.

The present invention is not limited to forming the transparent electrodes 20 and 23 directly on the piezoelectric film 16. For example, as in the touch sensor 190 of FIG. 19A, a third laminated body 24 in which the fourth transparent electrode 23 is laminated on the third base film 22 is prepared, and the third laminated body 24 is formed by the transparent packing layer 44. It may be adhered to the piezoelectric film 16. Similar to the above, the capacitance sensor 191 and the piezoelectric sensor 192 alternately use the same transparent electrodes 20 and 23.

Further, the touch sensor 193 of FIG. 19B prepares a second laminated body 21 in which the third transparent electrode 20 is laminated on the second base film 19, and adheres the second laminated body 21 to the piezoelectric film 16. There is. Similar to the above, the capacitance sensor 194 and the piezoelectric sensor 195 alternately use the same transparent electrodes 20 and 23.

Further, the touch sensor 196 of FIG. 19C prepares the above-mentioned second laminated body 21 and third laminated body 24 and adheres them to the piezoelectric film 16. Similar to the above, the capacitance sensor 197 and the piezoelectric sensor 198 alternately use the same transparent electrodes 20 and 23.

In FIG. 19, the direction of the piezoelectric film 16 is not limited, and the positions of the first base film 14 and the piezoelectric coating layer 15 may be exchanged, and the first base film 14 may be adhered to the transparent packing layer 44. .. Further, the direction of the second laminated body 21 is not limited, and the third transparent electrode 20 may be adhered to the transparent packing layer 25. Further, the direction of the third laminated body 24 is not limited, and the third laminated body 22 may be adhered to the transparent packing layer 44.

At least one of the undercoat layer (ancher coat layer), the refractive index adjusting layer (index matching layer) (optical adjustment layer), and the anti-blocking layer described in the first embodiment is formed of the piezoelectric film 16 and the third and fourth transparent electrodes 20. , 23 may be formed.

[Embodiment 17]
In each embodiment, a transparent electrode may be arranged between the touch sensor and the display. For example, as in the touch sensor 200 of FIG. 20, a laminated body in which the seventh transparent electrode 201 is laminated on the entire surface of the seventh base film 202 is prepared and bonded with the transparent packing layer 203. The seventh transparent electrode 201 serves as a shield.

[Embodiment 18]
Although the refractive index adjusting layer has been described in the above embodiment, the refractive index adjusting layer 210 may be arranged between the piezoelectric film 16 and the second transparent electrode 18 as in the touch sensor 210 of FIG. The touch sensor 210 of FIG. 21 has the same configuration except that the refractive index adjusting layer 210 is added to the touch sensor 10 of FIG. Further, the refractive index adjusting layer 210 may be arranged between the piezoelectric film 16 and the first transparent electrode 17.

As an example, the thickness of the piezoelectric coating layer 15 is 0.5 to 10 μm, the thickness of the refractive index adjusting layer 210 is 80 to 160 nm, and the thickness of the second transparent electrode 18 is 20 nm or more. Further, the refractive index of the coating layer 15 having piezoelectricity is 1.40 to 1.50, the refractive index of the refractive index adjusting layer 210 is 1.50 to 1.70, and the refractive index of the second transparent electrode 18 is 1.90. ~ 2.10 is given as an example. Further, the thickness of the first base film 14 is set to 2 to 100 μm, and the refractive index is set to 1.50 to 1.70. With the above thickness and refractive index, the reflectance difference between the second transparent electrode 18 and the refractive index adjusting layer 210 becomes 2.0% or less, and the appearance is improved.

[Examples 1 to 3]
In FIG. 12, the total light transmittance and haze of the touch sensor 10 when the thickness of the coating layer 15 is 1 μm, 5 μm, and 10 μm were measured, and the results are shown in Table 1. P (VDF-TrFE) was used for the coating layer 15, and the molar ratio was 72:25. PET was used for the base film 14, and the thickness thereof was 23 μm. Total light transmittance and haze were measured using a Direct reading haze computer (HGM-ZDP manufactured by Suga Test Instruments).

[Comparative Example 1]
As a comparative example, the total light transmittance and the haze were measured when the piezoelectric film 222 was attached to the first base film 14 by the transparent packing layer 221 as in the touch sensor 220 shown in FIG. The piezoelectric film 222 was a single film produced by extrusion using PVDF, and had a thickness of 80 μm. The transparent packing layer 221 used an optical transparent adhesive and had a thickness of 22 μm. Other configurations are the same as in the case of the embodiment.

From Table 1, all the examples have better total light transmittance and haze than the comparative examples. In the comparative example, it is considered that the thickness of the piezoelectric film 222 became too thick, and the haze was particularly deteriorated due to the thickness.

[Examples 4 to 9]
Further, in order to confirm the change in appearance due to the refractive index adjusting layer 211 of FIG. 21, the coating layer 15 having piezoelectricity and the refractive index adjusting layer are placed on the first base film 14 having a thickness of 23 μm as shown in FIG. 23. 211, the second transparent electrode 18 was prepared, and the thickness and the refractive index were measured. The results are shown in Table 2. The "first layer" is the piezoelectric coating layer 15, the "second layer" is the refractive index adjusting layer 211, and the "third layer" is the second transparent electrode 18.

The piezoelectric film 16 was prepared by coating a polyethylene terephthalate base film with a copolymer of vinylidene fluoride, trifluoroethylene, and chlorotrifluoroethylene. The copolymer of vinylidene fluoride, trifluoroethylene, and chlorotrifluoroethylene ^{was Piezotech RT TM} TS manufactured by Arkema Co., Ltd., and a solution was prepared in MIBK (methyl isobutyl ketone) by ultrasonic waves. Next, a solution of a copolymer of vinylidene fluoride, trifluoroethylene, and chlorotrifluoroethylene was coated on the polyethylene terephthalate base film by a bar coater. Next, the polyethylene terephthalate base film and the undried coating layer were dried at 110 ° C. for 5 minutes to prepare a coating layer. The thickness of the coating layer 15 shown in Table 2 is the thickness after drying.

The refractive index adjusting layer 211 may have a refractive index of 1.54, 1.62, or 1.7, as shown in 2 in the table below. Since the manufacturing method differs depending on the refractive index, each refractive index will be described. When the refractive index is 1.54, a thermosetting resin (refractive index of light) having a weight ratio of melamine resin: alkyd resin: organic silane condensate of 2: 2: 1 is placed on one surface of the piezoelectric coating layer 15. n = 1.54) formed the refractive index adjusting layer 211 having a thickness of 120 nm.

When the refractive index is 1.62, an optically adjusting composition containing 47 parts by mass of an ultraviolet curable resin, 57 parts by mass of zirconia oxide particles (median diameter 40 nm) and PGME on one surface of the coating layer 15 having piezoelectricity. (JSR, "Opstar Z7412", solid content 12% by mass) was applied using a gravure coater, and immediately heated and dried at 60 ° C. for 1 minute in a windless state (less than 0.1 m / s). Then, the curing treatment was carried out by irradiating ultraviolet rays having an integrated light intensity of 250 mJ / cm ^{2 with a high-pressure mercury lamp.} By this method, a refractive index adjusting layer 211 having a thickness of 90, 120, or 150 nm and a refractive index of 1.62 was formed on the coating layer 15 having piezoelectricity.

_{When the refractive index is 1.7, TiO 2 is} added to a thermosetting resin (melamine resin: alkyd resin: organic silane condensate = 2: 2: 1 by weight) composed of a melamine resin, an alkyd resin, and an organic silane condensate. A resin composition was prepared by mixing fine particles of (refractive index = 2.35). At this time, the mixing amount of the _{TiO 2} fine particles was adjusted so that the refractive index of the resin composition was 1.70. Then, the resin composition was applied onto the piezoelectric coating layer 15 and cured to form a refractive index adjusting layer 211 (refractive index 1.70) having a thickness of 150 nm.

A hard coat layer 231 having an anti-blocking function is formed on the opposite surface of the coating layer 15 in the first base film 14.

In each embodiment, as described above, the thickness of the piezoelectric coating layer 15 is 0.5 to 10 μm, the thickness of the refractive index adjusting layer 211 is 80 to 160 nm, and the thickness of the second transparent electrode 18 is 20 nm or more. It has become. Further, the refractive index of the coating layer 15 having piezoelectricity is 1.40 to 1.50, the refractive index of the refractive index adjusting layer 211 is 1.50 to 1.70, and the refractive index of the second transparent electrode 18 is 1.90. It is ~ 2.10. The difference in reflectance between the second transparent electrode 18 and the refractive index adjusting layer 211 was 2% or less, and the appearance was good.

If necessary, the second transparent electrode 18 is etched to obtain a desired electrode or the like. When determining the refractive index, the portion of the refractive index adjusting layer 211 from which the second transparent electrode 18 was removed by etching was used. Therefore, the reflectance difference was obtained by obtaining the reflectances of the air and the second transparent electrode 18 and the air and the refractive index adjusting layer 211 from each refractive index.

[Comparative Examples 2-3]
As a comparative example with respect to Examples 4 to 9, the case where the refractive index adjusting layer 211 was not present (Comparative Example 3) and the case where the refractive index of the refractive index adjusting layer 211 was smaller than 1.5 (Comparative Example 4) were performed. In the absence of the refractive index adjusting layer 211, the reflectance difference is the difference between the second transparent electrode 18 and the piezoelectric coating layer 15. The reflectance difference became larger than 2%, and the appearance became poor.

When the refractive index is 1.46 (Comparative Example 4), the refractive index adjusting layer 211 is obtained by diluting silica sol (Colcoat P, manufactured by Colcoat Co., Ltd.) with ethanol so that the solid content concentration is 2%. _{A layer having a thickness of 120 nm (SiO 2} film, refractive index of light 1.) is coated on one of the piezoelectric coating layers 15 by a silica coating method, then dried and cured at 150 ° C. for 2 minutes. 46) was formed to form the refractive index adjusting layer 211. In the comparative example, the manufacturing method of other configurations is the same as that of the embodiment.

From the above, by providing the second transparent electrode 18 on the coating layer 15 having piezoelectricity, the second transparent electrode 18 may develop a yellow or brown color and impair the appearance. As in the present invention, the refractive index adjusting layer 211 is provided, and the thickness and the refractive index of the second transparent electrode 18, the refractive index adjusting layer 211, and the piezoelectric coating layer 15 are adjusted so as to be within the above-mentioned values. As a result, it was found that the difference in refractive index can be reduced as shown in Table 2 and the appearance is not impaired. It was found that even if the structure in which the refractive index adjusting layer 211 and the second transparent electrode 18 are laminated on the piezoelectric film 16 is arranged on the front surface of the display, the appearance of the display is not spoiled.

In addition, the present invention can be carried out in a mode in which various improvements, modifications and changes are made based on the knowledge of those skilled in the art without departing from the gist thereof.

The touch sensor of the present invention is arranged on the front surface of the display and can be used integrally with the display.

10, 30, 40, 45, 50, 55, 60, 70, 80, 90, 100, 102, 110, 112, 120, 123, 130, 132, 140, 142, 150, 152, 160, 164, 170, 190, 193, 196, 200, 210: Touch sensors 11, 41, 46, 56, 61, 101, 103, 111, 113, 122, 124, 131, 133, 141, 143, 151, 153, 162, 165, 172, 192, 195, 198: Piezoelectric sensor 12, 27, 28, 29, 71, 81, 91, 121, 161, 171, 191, 194, 197: Capacitance sensor 13, 25, 44, 183: Transparent filling Layers 14, 19, 22, 42, 52, 72, 182: Base film 15: Piezoelectric coating layers 16, 21, 24, 43, 53, 62, 71, 81: Laminates 17, 18, 20, 23, 82, 83, 92, 181: Transparent electrode 84: Insulator 211: Refractive index adjusting layer 231: Hard coat layer having anti-blocking function

Claims (15)

A capacitance sensor that detects the coordinates of the touch position by the capacitance method,
A piezoelectric sensor provided on the back surface of the capacitance sensor and having a piezoelectric coating layer laminated on a base film is used to detect pressure.
Touch sensor with. A piezoelectric sensor that detects pressure using a piezoelectric film in which a piezoelectric coating layer is laminated on the back surface of the base film,
A transparent electrode laminated on the surface of the base film and for detecting the coordinates of the touch position by the capacitance method,
Touch sensor with. To detect a change in potential when a piezoelectric film in which a piezoelectric coating layer is laminated on a base film, and a piezoelectric film arranged on one side and the other side of the piezoelectric film and polarized. Piezoelectric sensor with transparent electrode
A transparent electrode arranged on one side of the piezoelectric sensor and for detecting the coordinates of the touch position by the capacitance method,
Touch sensor with. A piezoelectric film in which a coating layer having piezoelectricity is laminated on a base film, and a piezoelectric sensor provided with transparent electrodes arranged on one side and the other side of the piezoelectric film.
A capacitance sensor that is placed on one side of the piezoelectric sensor and detects the coordinates of the touch position by the capacitance method,
With
The transparent electrode arranged on one side of the piezoelectric film is a transparent electrode for detecting a change in electric potential when the piezoelectric coating layer is polarized, and a capacitance method for detecting the coordinates of the touch position. A touch sensor that is a transparent electrode. A piezoelectric film in which a piezoelectric coating layer is laminated on a base film, and
The transparent electrodes arranged on one side and the other side of the piezoelectric film,
With
The transparent electrodes arranged on one surface side and the other surface side of the piezoelectric film are transparent electrodes for detecting a change in potential when the coating layer having piezoelectricity is polarized, and at least one surface side of the piezoelectric film. A touch sensor in which the transparent electrode arranged in is a transparent electrode for detecting the coordinates of the touch position by the capacitance method. The touch sensor according to any one of claims 1 to 5, wherein the thickness of the piezoelectric coating layer exceeds 0.5 μm and is less than 20 μm. The touch sensor according to any one of claims 1 to 6, wherein the piezoelectric coating layer contains a fluororesin. The touch sensor according to claim 7, wherein the fluororesin is a copolymer of two or more of vinylidene fluoride, tetrafluoroethylene, and chlorotrifluorotilene, or a polymer of vinylidene fluoride. The touch sensor according to any one of claims 1 to 8, further comprising at least one undercoat layer, a refractive index adjusting layer, and an anti-blocking layer between the base film and the piezoelectric coating layer. Between the piezoelectric film and the transparent electrode for detecting the coordinates of the touch position, between the piezoelectric film and the transparent electrode for detecting the change in electric potential when the coating layer having piezoelectricity is polarized, or the like. The touch sensor according to any one of claims 1 to 9, further comprising at least one undercoat layer, a refractive index adjusting layer, and an anti-blocking layer between the two. The touch sensor according to claim 10, wherein the thickness of the coating layer is 0.5 to 10 μm, the thickness of the refractive index adjusting layer is 80 to 160 nm, and the thickness of the transparent electrode is 20 nm or more. Claim 10 or claim 10, wherein the refractive index of the coating layer is 1.40 to 1.50, the refractive index of the refractive index adjusting layer is 1.50 to 1.70, and the refractive index of the transparent electrode is 1.90 to 2.10. 11 touch sensors. A claim in which a transparent electrode for detecting the coordinates of the touch position, a transparent electrode for detecting a change in electric potential when the piezoelectric coating layer is polarized, or both are directly formed on the piezoelectric film. The touch sensor according to any one of 1 to 12. A claim in which the base film is selected from at least one of polyethylene terephthalate, polyethylene naphthalate, polyolefin, polycycloolefin, cycloolefin copolymer, polycarbonate, polyether sulfone, polyarylate, polyimide, polyamide, polystyrene, and polynorbornene. The touch sensor according to any one of 1 to 13. The touch sensor according to any one of claims 1 to 14, wherein the transparent electrode is a transparent electrode containing indium oxide as a main component.

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