JP3590530B2 - Touch panel - Google Patents

Description

すなわち、タッチパネルＰＡ１では、導電層形成部材１２、導電層形成部材２３にはアートンを、支持部材２２にはポリカーカーボネートを、接着層２５には日東電工株式会社製の両面粘着テープＨＪ９１５０Ｗを使用してある。
【００５９】
タッチパネルＰＡ２では、導電層形成部材１２、導電層形成部材２３及び支持部材２２すべてにアートンを、接着層にはパネルＰＡ１同様に日東電工株式会社製の両面粘着テープＨＪ９１５０Ｗを使用してある。
【００６０】
比較例としてのタッチパネルＰＡ３は、タッチ側の導電層形成部材にはポリエチレンテレフタラート（ＰＥＴ）を、ディスプレイ側の導電層形成部材にはアートンを、支持部材にはポリカーボネート（ＰＣ）を、接着層には上記同様に日東電工株式会社製の両面粘着テープＨＪ９１５０Ｗを使用してある。
【００６１】
また、別な比較例としてのタッチパネルＰＡ４は、タッチ側の導電層形成部材及びディスプレイ側の導電層形成部材にはポリエチレンテレフタラート（ＰＥＴ）を、支持部材にはポリカーボネート（ＰＣ）を、接着層にはここでも上記同様に日東電工株式会社製の両面粘着テープＨＪ９１５０Ｗを使用してある。
【００６２】
なお、タッチパネルＰＡ１及びＰＡ２では、上記素材の組み合わを採用することにより導電層形成部材１２、導電層形成部材２３及び支持部材２２の線膨張係数の差が１×１０−５／℃以下になる。
【００６３】
タッチパネルＰＡ３及びＰＡ４では、タッチ側の導電層形成部材、ディスプレイ側の導電層形成部材及び支持部材の素材の組み合わせは、その線膨張係数の差が１×１０−５／℃を超える値の組み合わせである。
【００６４】
以上のようにして作製したタッチパネルＰＡ１〜ＰＡ４を以下の条件の環境におき、それらの特性を検証した。
【００６５】
まず、−４０℃に６０分さらし、次いで温度上昇速度２℃／ｍｉｎで１００℃まで昇温させ、当該１００℃下に１００分さらすというサイクルを１００サイクル繰り返した場合（１００℃から−４０℃への温度降下速度は、２℃／ｍｉｎで行った。）における、タッチパネルの変形の度合いを調べた。
【００６６】
加えて、上記サイクル実験の際に、コネクタ電極１３３、１３４、コネクタ電極２４３，２４４の端子間抵抗を同時に調べた。
【００６７】
それらの結果を上記表１に併記した。
【００６８】
表１に示すように、比較例に係るタッチパネルＰＡ３及びＰＡ４は、０℃付近でポリエチレンテレフタレートを使用した部材のたわみによるパネル全体の変形が発生したが、実施例に係るタッチパネルＰＡ１及びＰＡ２双方ともに、−４０℃及び１００℃下での変形は見られなかった。
【００６９】
なお、１００サイクル実験終了後室温に放置した場合に、タッチパネルＰＡ３及びＰＡ４では、変形は回復しなかったことからこのタッチパネルＰＡ３及びＰＡ４には、低温（−４０℃）、高温（１００℃）の環境下にさらすことにより、致命的な変形が発生したことがうかがえる。一方、タッチパネルＰＡ１及びＰＡ２では、１００サイクル実験終了後室温に放置した場合にも変形は見られなかった。
【００７０】
また、タッチパネルＰＡ３は、端子間抵抗が２０サイクルぐらいのときに、初期値の１．１倍、タッチパネルＰＡ４では２倍に達していたが、タッチパネルＰＡ１及びＰＡ２ともに、１００サイクル繰り返しても１．１倍と極めて優れた安定性を示した
タッチパネルＰＡ３及びＰＡ４については、電極の配線構造によっては、２０サイクルぐらいで端子間抵抗が初期の３倍にも達する。タッチパネルＰＡ１及びＰＡ２ではこのような配線構造の違いによる抵抗の変化は認められなかった。
【００７１】
【発明の効果】
以上説明してきたように、本発明のタッチパネルは、第１、第２の面状部材は樹脂製であって、第１の面状部材は、導電層形成部材とそれを支持する支持部材とを積層してなり、第２の面状部材及び導電層形成部材には、非晶質ポリオレフィン系樹脂シートが用いられ、前記支持部材には、その線膨張係数が、第２の面状部材及び導電層形成部材の線膨張係数との差が１×１０^-5／℃以内である部材を用いる。
【００７２】
このように前記第２の面状部材及び導電層形成部材に非晶質ポリオレフィン系樹脂シートを用い、しかも導電層形成部材を支持する支持部材に第２の面状部材及び導電層形成部材の線膨張係数との差が１×１０−５／℃以内である透明シートを用いているので、広い温度範囲、軽量、耐衝撃性を備えたタッチパネルを実現することができる。
【図面の簡単な説明】
【図１】実施の形態に係るタッチパネルの分解図である。
【図２】前記タッチパネルの断面図である。
【符号の説明】
１ タッチパネル
１０ タッチ側基板
１１ ハードコート層
１２ 導電層形成部材
１３ 導電層
２０ ディスプレイ側基板
２１ ハードコート層
２２ 支持部材
２３ 導電層形成部材
２４ 導電層
２５ 接着層
３０ スペーサ
３１ 空気層
４０ 接着剤
１３１，１３２ 電極
１３３、１３４ コネクタ電極
１３５，１３６ 配線パターン
２４１，２４２ 電極
２４３，２４４ コネクタ電極
２４５，２４６ 配線パターン[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resistive touch panel, and more particularly, to a touch panel in which two resistive films are opposed to each other at regular intervals, and a pressed position is detected from a resistance value from a reference position to a contact position of each resistive film. About.
[0002]
[Prior art]
In general, personal digital assistants (PDAs) and portable information terminals typified by sub-notebook personal computers have an emphasis on portability and ease of use. And a resistive touch panel. In this resistive touch panel, an input is achieved by pressing the panel with a finger or a pen, and the pressed position is generally determined based on the magnitude of the resistance value from the reference position to the contact position. Confirmed as coordinates.
[0003]
In the touch panel, when pressure is applied to the touch panel, pressure is applied directly to the liquid crystal layer, preventing the liquid crystal layer from fluctuating and impairing the display function. It is fixed with a gap through the provided adhesive layer. Naturally, the substrate on the touch panel display side must have appropriate rigidity against input pressure.
[0004]
By the way, on the touch-side substrate on which the input operation of the resistive touch panel is performed, a film-shaped transparent polyethylene terephthalate or polycarbonate in which a photocurable acrylic resin layer for surface protection is formed on one or both surfaces. On the other hand, soda lime glass or tempered glass is used for the display-side substrate. Then, a thin film of indium tin oxide (hereinafter referred to as ITO) is formed as a transparent conductive layer on one surface of each substrate.
[0005]
[Problems to be solved by the invention]
The functions required for the touch panel mounted on the portable information terminal device mainly include the following five functions.
[0006]
(1) High transparency
(2) High durability against mechanical shock and friction applied when pressed
(3) Suitable for thinning and weight reduction
(4) High impact resistance (The substrate, etc. should not be damaged by the impact of falling.)
(5) Wide heat-resistant temperature range (operating temperature range: -40 ° C to 100 ° C)
(6) Has appropriate rigidity
With respect to the above requirements (1) and (2), the technology for forming a transparent conductive layer on a touch-side substrate using polyethylene terephthalate and a display-side substrate using glass, and the touch-side substrate and the transparent conductive layer are improved. Practically required by inserting a suitable inorganic metal oxide and a suitable resin layer between the layers and forming a layer (hereinafter, referred to as "hard coat layer") made of a suitable resin on the surface of the touch-side substrate. Attained standards.
[0007]
Regarding the above functions (3) and (4), when glass is used for the display-side substrate, even if tempered glass is used instead of general soda glass, the arrangement and reinforcement of the metal frame for impact mitigation can be achieved. There is a limit to the reduction in thickness because a transparent resin sheet must be attached to the back. In addition, as long as a glass substrate is used, it is impossible to prevent the glass from being damaged by a strong mechanical shock.
[0008]
Therefore, it has been studied to replace the glass substrate with a transparent resin sheet such as polycarbonate or polymethyl methacrylate which is relatively thin and has appropriate rigidity.
[0009]
The structure in which a transparent conductive layer such as ITO is formed on a transparent resin sheet as a substitute for a glass substrate is roughly classified into (a) a transparent conductive layer directly on one side of a transparent resin sheet as a support such as polycarbonate or polymethyl methacrylate. The formed integral structure (transparent conductive layer / support) and (b) a film-shaped transparent resin sheet having a transparent conductive layer formed on one surface of polyethylene terephthalate or polycarbonate, and an acrylic adhesive layer on the non-conductive surface There have been proposed two types of laminated structures (transparent conductive layer / film-shaped transparent resin sheet / adhesive layer / support) in which a transparent resin sheet such as polycarbonate or polymethyl methacrylate is adhered to the entire surface as a support for providing rigidity through the intermediary. I have.
[0010]
In the case of the above-mentioned integral structure, by interposing an organosiloxane layer having a crosslinked structure between the support and the transparent conductive layer such as ITO, practically required durability against friction generated upon input of the transparent conductive layer, A transparent conductive resin sheet having adhesiveness of the transparent conductive layer, transparent and appropriate rigidity, and heat resistance can be obtained.
[0011]
Generally, the transparent conductive layer is formed by a vacuum thinning technique such as a sputtering method, a resistance evaporation method, and an electron beam evaporation method. However, when a transparent conductive layer is formed on polycarbonate having a saturated water content of 0.4% or polymethyl methacrylate having 2.0%, dehydration of a substrate before film formation is indispensable, and dehydration is insufficient. In this case, the thermal stability of the resistance value of the transparent conductive layer and the adhesion to the substrate are significantly reduced. Therefore, in a film forming process for forming a transparent conductive layer directly on a thick support having rigidity such as an integral structure, a longer time is required for dehydration treatment under vacuum than in the case of glass. Issues have been pointed out.
[0012]
On the other hand, in the case of a laminated structure, the transparent conductive layer is formed on a thin film of polyethylene terephthalate or polycarbonate, which is thinner than the support, so that the dehydration treatment can be performed in a short time, mass productivity is high, and Since it is not so complicated in structure, it is widely used as compared with an integrated structure.
[0013]
However, in this laminated structure, depending on the combination, the linear expansion coefficient of the support and the film-like transparent resin sheet (polycarbonate: 〜6.2 × 10 -5 / ° C., polymethyl methacrylate; ６6.9 × 10 -5) /.Degree. C., polyethylene terephthalate; .about.1.5.times.10.sup.-5 / .degree. C.).
[0014]
Further, when polyethylene terephthalate is used for the film-like transparent resin sheet, it has a low glass transition point (Tg: about 70 ° C.). This results in a decrease in heat resistance such as bending of the display-side substrate.
[0015]
The phenomenon associated with the change in the environmental temperature described above becomes even more remarkable when polyethylene terephthalate is used for the touch-side substrate, causing erroneous input operation of the touch panel and electric power on the panel body side of the connector connecting the panel body and the control board. Problems such as a defective contact point occur.
[0016]
Therefore, the operating temperature range of a touch panel using polyethylene terephthalate as the film-like transparent resin sheet of the touch-side substrate or the display-side substrate is limited to a range of about 0 ° C. to 40 ° C.
[0017]
On the other hand, if a material that matches the linear expansion coefficient of each layer constituting the touch panel and the support is used, the deformation due to the deflection can be suppressed. In particular, when polycarbonate (Tg: 150 ° C.) having a high glass transition point is used as a material, heat resistance can be ensured.
[0018]
However, since this polycarbonate has a low surface hardness, it is essential that both surfaces thereof be hard-coated with a transparent resin layer of silicone, cellulose, melamine or urethane. However, the alkali resistance and solvent resistance of polycarbonate are lower than that of polyethylene terephthalate. The contact resistance between the transparent conductive layer and the transparent conductive layer formed by applying and printing on the transparent conductive layer using silver ink or a mixed ink of silver and carbon There is a problem that it fluctuates easily in a high temperature environment.
[0019]
Therefore, the present invention has been made in view of the above various problems, and an object of the present invention is to provide a touch panel having a wide operating temperature range, light weight, and impact resistance.
[0020]
[Means for Solving the Problems]
The above object is achieved by the following touch panel.
[0021]
That is,Made of resinIn a resistive touch panel in which a first and a second planar member are opposed to each other at a fixed interval and a conductive layer is formed on an inner surface facing each other, the first planar member is a conductive film. A conductive layer forming member having a layer formed on the surface thereof and a supporting member for supporting the member;Together withAn amorphous polyolefin-based resin sheet is used for the second planar member and the conductive layer forming member, and the support member has a linear expansion coefficient of the second planar member and the conductive layer forming member. The difference from the expansion coefficient is 1 × 10^-Five/ ° C or less.
[0022]
An amorphous polyolefin-based resin sheet is used for the second planar member and the conductive layer forming member, and the linear expansion coefficient of the second planar member and the conductive layer forming member is set to a supporting member for supporting the conductive layer forming member. The temperature difference is within 1 × 10 −5 / ° C., so that a wide temperature range (excellent heat resistance of the amorphous polyolefin resin sheet and the difference in linear expansion coefficient between the members were adjusted) ), Light-weight (by not using a glass substrate as in the conventional case), and impact resistance (by not using a glass substrate as in the conventional case).
[0023]
As the support member, an amorphous polyolefin-based resin sheet, a polycarbonate-based resin sheet, or an acrylic resin sheet can be used.
[0024]
The amorphous polyolefin-based resin sheet can be formed by a solvent casting method or a melt extrusion method.
[0025]
Here, in the resistive touch panel having the above configuration, the conductive layer provided on the first and second planar members is provided.The surface roughness of at least one of the conductive layers is 0 in the evaluation of the center line surface roughness in JIS standard. . 05-2 μm and maximum height is 0 . So that it is set in the range of 6 to 3 μmThis can prevent erroneous input when the input operation is repeatedly performed.
[0026]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a touch panel according to an embodiment of the present invention will be specifically described.
[0027]
* Configuration
FIG. 1 is an exploded view showing the structure of the touch panel 1 according to the embodiment, and FIG. 2 is a sectional view taken along line XX after assembly.
[0028]
The touch panel 1 is a resistive touch panel. As shown in FIG. 1, the touch panel 10 and the display substrate 20 are opposed to each other in a state where an air layer 31 is formed via a spacer 30. Have been.
[0029]
The touch-side substrate 10 is a planar member on the touch panel 1 that receives an input from an operator using a finger or a device. The touch-side substrate 10 is made of a material having excellent flexibility and heat resistance and high transparency. It comprises a conductive layer forming member 12 on which the hard coat layer 11 is formed, and a conductive layer 13 formed on one surface 11a of the hard coat layer 11 and located at the center of the panel. Electrodes 131 and 132 are provided on two opposing sides of the conductive layer 13. At the end of the conductive layer forming member 12, connector electrodes 133 and 134 to which a connector (not shown) is connected are formed on the hard coat layer 11, and a space between the connector electrodes 133 and 134 and the electrodes 131 and 132 is formed. They are connected by wiring patterns 135 and 136.
[0030]
The display-side substrate 20 is formed with a support member 22 having a hard coat layer 21 formed on both surfaces thereof and a conductive layer forming member 23 on one surface 21 a side of the hard coat layer 21, and is located at the center of the panel. And a conductive layer 24. The conductive layer forming member 23 is adhered to the surface 21 a of the hard coat layer 21 via an adhesive layer 25. Electrodes 241 and 242 are formed on two opposing sides of the conductive layer 24 in a direction orthogonal to the opposing direction of the electrodes 131 and 132 formed on the conductive layer 13. At the end of the conductive layer forming member 23, a pair of connector electrodes 243 and 244 to be connected to a connector are formed as described above, and further, the connector electrodes 243 and 244 are connected to the electrodes 241 and 242. Wiring patterns 245 and 246 are formed. On the surface of the conductive layer 24, for example, dot-shaped spacers 30 (about 10 μm in height and about 10 to 50 μm in diameter) made of photo-curable acrylic resin are arranged at predetermined intervals (several mm intervals). I have.
[0031]
The touch-side substrate 10 and the display-side substrate 20 are bonded by an adhesive 40 at their peripheral edges in a state where the conductive layers 13 and 24 face each other in parallel.
[0032]
* About hard coat layer
The hard coat layer is formed by coating a photo-curable silicone, acrylic, cellulose, melamine or urethane resin and irradiating it with ultraviolet light to form a base material (conductive layer forming member 12, supporting member 22). A thin layer having a thickness of several μm formed by chemically bonding the entire surface.
[0033]
The hardness of the surface of the conductive layer forming member 12 on which the hard coat layer is formed is set to H or more by a pencil hardness measurement method from the viewpoint of imparting durability to friction, adhesion of the conductive layer, and appropriate rigidity to the conductive layer. , And more preferably 3H or more.
[0034]
In addition, such a hard coat layer may be formed on the surface of the conductive layer forming member 23.
[0035]
* About conductive layer
The conductive layer is made of a transparent and conductive metal oxide, and is formed by applying a conventional vacuum thinning technique such as a sputtering method, a resistance evaporation method, or an electron beam evaporation method.
[0036]
Metal oxides include ITO, indium oxide, tin oxide with antimony, tin oxide with fluorine, zinc oxide with aluminum, zinc oxide with potassium, zinc oxide with silicon, or zinc oxide-tin oxide, indium oxide-tin oxide. Metal oxides such as zinc oxide, indium oxide and magnesium oxide. Note that the conductive layer is not limited to a single layer, and may be formed in a plurality of layers using different types of metal oxides.
[0037]
The pattern of the conductive layers 13 and 24 located at the center of the panel is formed by wet etching after forming a conductive film on the entire surface of the hard coat layer 11 and the conductive layer forming member 23.
[0038]
Next, electrodes 131, 132, 133, 134, 241, 242, 243, 244 and wiring patterns 135, 136, 245, 246 are formed by coating and printing using silver ink or a mixed ink of silver and carbon.
[0039]
Note that, between the conductive layer and the hard coat layer, silicon oxide, titanium oxide, tin oxide, tin oxide-hafnium oxide, silicon oxide-tin oxide, zinc oxide-tin oxide, tin oxide-titanium oxide, etc. The metal oxide layer can be formed as a single layer or a multilayer. By forming such a layer, the light transmittance of the panel itself can be further improved.
[0040]
By the way, the surface roughness of the conductive layer is adjusted so as to prevent physical adsorption between the conductive layers during an input operation. In particular, since the amorphous polyolefin-based resin sheet described later, which is adopted for both the conductive layer forming member 12 and the conductive layer forming member 23 on which the respective conductive layers are formed, is a very flat sheet having a small surface roughness. The conductive layer formed thereon reflects the surface condition of the sheet (the same is true even when the hard coat layer is formed), and the surface of the conductive layer is also flat. It becomes something. Therefore, in this state, the conductive layers tend to adhere to each other at the time of the input operation, and erroneous input is likely to occur when the input operation is repeatedly performed.
[0041]
Specifically, the center height is set in the range of 0.05 to 2 μm and the maximum height is in the range of 0.6 to 3 μm in the evaluation of the center line surface roughness according to the JIS standard. The surface roughness of both conductive layers 13 and 24 may be defined in this way, or only one of them may be defined.
[0042]
The surface roughness can be adjusted by the following methods (1) to (5).
[0043]
(1) Before forming the conductive layer, the conductive layer forming member 12 (which may have a hard coat layer formed thereon) and the conductive layer forming surface of the conductive layer forming member 23 are rolled by a metal roll having a desired surface roughness. How to press
{Circle around (2)} A method of forming an uneven shape by thermocompression bonding a mold having an uneven surface.
{Circle around (3)} A method of forming a conductive layer after coating a coating agent containing organic or inorganic spherical fine particles.
(4) Combination of the methods (1) and (3) above
(5) Combination of method (2) and method (3)
* About adhesive layer 25
The adhesive layer 25 is a mixture layer of an adhesive and a plasticizer having a predetermined thickness (for example, 5 to 100 μm). As the adhesive, for example, a rubber-based adhesive, an acrylic-based adhesive, a silicone-based adhesive, or the like can be used.
[0044]
When an input operation is performed by pressing, the pressing is also transmitted to the conductive layer 24 on the display side, and a part of the conductive layer 24 is elastically deformed into a concave shape. If this elastic deformation is repeatedly performed, at the worst, the restorability of the conductive layer itself is lost. In this case, the concave portion remains on the surface of the conductive layer 24, and the input operation using the touch panel cannot be performed properly. Here, the adhesive layer 25 plays a role of giving elasticity to the conductive layer 24 and contributes to avoid such a problem.
[0045]
* About conductive layer forming member 12, support member 22, and conductive layer forming member 23
As the conductive layer forming member 12 and the conductive layer forming member 23, a sheet having a predetermined thickness made of an amorphous polyolefin resin is used. The thickness of the resin sheet is preferably 25 μm to 300 μm. If the thickness is less than 25 μm, sufficient mechanical strength cannot be obtained, and if it exceeds 300 μm, it takes time for the dehydration treatment. This amorphous polyolefin-based resin sheet has several properties as described in the following (A) to (E), and is therefore a suitable member for designing a touch panel.
[0046]
(A) Extremely high visible light transmittance (high transparency)
(B) High heat resistance with a glass transition point of 120 ° C or higher
(C) High solvent resistance
(D) Low moisture absorption
(E) Linear expansion coefficient 5-7 × 10-5 / ° C
The following effects can be mentioned as specific effects obtained by these characteristics.
[0047]
Due to the characteristic (A), an effect of improving the transparency of the entire panel can be obtained. The transparency is remarkably improved as compared with the case where a resin sheet made of polyethylene terephthalate, polycarbonate or polymethyl methacrylate, which has been generally used in the past, is used.
[0048]
Due to the characteristic (B), there is an effect that thermal deformation hardly occurs even when used in a higher temperature environment than in the past, and an erroneous input factor can be eliminated.
[0049]
Due to the characteristic (C), there is an effect that the adhesion between the hard coat layer and the conductive layer is not reduced by the above wet etching process of the transparent conductive layer such as ITO formed on the hard coat layer which is indispensable at the time of manufacturing the touch panel. .
[0050]
Due to the characteristic (D), there is an effect that the member can be dried in a short time when the conductive layer is formed.
[0051]
Here, as the amorphous polyolefin-based resin, a resin in which a sterically bulky functional group is introduced into a polymer main chain in order to suppress crystallization can be used. Specifically, 6-methyl-1,4,4 Zeonex (trade name of Nippon Zeon Co., Ltd.), a hydrogenated product of a ring-opened polymer of 5,8-dimetano-1,4,4a, 5,6,7,8,8a-octahydronaphthalene, norbornene resin (Trade name of JSR Corporation), Apel (trade name of Mitsui Petrochemical Company) which is an ethylene-norbornene addition copolymer or an ethylene-tetracyclododecene addition polymer, or the like can be used.
[0052]
In the present embodiment, a resin sheet is prepared by using a known solvent casting method (solvent casting method) or a melt extrusion method using these amorphous polyolefin-based resins. Sheets produced by the solvent casting method are preferred in that coloring due to oxidation is less likely to occur during production and, therefore, transparency is high.
[0053]
The support member 22 is a plate having an appropriate thickness (for example, 0.3 mm to 3 mm) for obtaining an appropriate rigidity, and has a difference in linear expansion coefficient between the conductive layer forming member 12 and the conductive layer forming member 23. Is made of a material having a temperature within 1 × 10 −5 / ° C. Specifically, an acrylic resin such as an amorphous polyolefin-based resin, a polycarbonate-based resin, and polymethyl methacrylate can be used. Among them, polycarbonate and an amorphous polyolefin-based resin having high heat resistance are preferable. Further, the support member 22 may be a laminate of a plurality of resin sheets made of the above-described material.
[0054]
As described above, by selecting a material having a difference between the linear expansion coefficients of the conductive layer forming member 12 and the conductive layer forming member 23 within 1 × 10 −5 / ° C. for the support member 22, the material is −40 wider than the conventional case. Even at an operating temperature of from 100 ° C. to 100 ° C., it is possible to suppress deflection caused by a difference in linear expansion coefficient.
[0055]
If the difference in the coefficient of linear expansion is set within 1 × 10 −5 / ° C., the difference in the change in volume of each member can be extremely small, and therefore, the generation of stress due to the change in volume can be suppressed. This is effective for suppressing the deformation of the panel.
[0056]
[Experiment]
Hereinafter, the results of examining the characteristics of the touch panels PA1 and PA2 manufactured based on the above embodiment will be described.
[0057]
The touch panels PA1 and PA2 were made of main materials as shown in Table 1 below.
[0058]
[Table 1]

That is, in the touch panel PA1, the conductive layer forming member 12, the conductive layer forming member 23 is made of ARTON, the support member 22 is made of polycarbonate, and the adhesive layer 25 is made of a double-sided adhesive tape HJ9150W manufactured by Nitto Denko Corporation. is there.
[0059]
In the touch panel PA2, ARTON is used for all of the conductive layer forming member 12, the conductive layer forming member 23, and the support member 22, and the double-sided adhesive tape HJ9150W manufactured by Nitto Denko Corporation is used for the adhesive layer like the panel PA1.
[0060]
In the touch panel PA3 as a comparative example, polyethylene terephthalate (PET) is used for the conductive layer forming member on the touch side, ARTON is used for the conductive layer forming member on the display side, polycarbonate (PC) is used for the support member, and the adhesive layer is used for the adhesive layer. Uses a double-sided adhesive tape HJ9150W manufactured by Nitto Denko Corporation in the same manner as described above.
[0061]
Further, in a touch panel PA4 as another comparative example, a conductive layer forming member on the touch side and a conductive layer forming member on the display side are made of polyethylene terephthalate (PET), the supporting member is made of polycarbonate (PC), and the adhesive layer is made of an adhesive layer. Also uses a double-sided adhesive tape HJ9150W manufactured by Nitto Denko Corporation in the same manner as described above.
[0062]
In the touch panels PA1 and PA2, the difference between the linear expansion coefficients of the conductive layer forming member 12, the conductive layer forming member 23, and the support member 22 becomes 1 × 10 −5 / ° C. or less by employing the combination of the above materials.
[0063]
In the touch panels PA3 and PA4, the combination of the materials of the conductive layer forming member on the touch side, the conductive layer forming member on the display side, and the support member is a combination of values whose difference in linear expansion coefficient exceeds 1 × 10 −5 / ° C. is there.
[0064]
The touch panels PA1 to PA4 manufactured as described above were placed in an environment under the following conditions, and their characteristics were verified.
[0065]
First, a cycle of exposing to −40 ° C. for 60 minutes, then increasing the temperature to 100 ° C. at a temperature increasing rate of 2 ° C./min, and exposing to 100 ° C. for 100 minutes is repeated 100 times (from 100 ° C. to −40 ° C.). Was performed at a rate of 2 ° C./min.), And the degree of deformation of the touch panel was examined.
[0066]
In addition, the resistance between the terminals of the connector electrodes 133 and 134 and the connector electrodes 243 and 244 was simultaneously examined during the cycle experiment.
[0067]
The results are shown in Table 1 above.
[0068]
As shown in Table 1, in the touch panels PA3 and PA4 according to the comparative example, the deformation of the entire panel due to the bending of the member using polyethylene terephthalate occurred near 0 ° C., but both the touch panels PA1 and PA2 according to the example No deformation was observed at -40 ° C and 100 ° C.
[0069]
When the touch panels PA3 and PA4 were left at room temperature after the completion of the 100-cycle experiment, the deformation was not recovered in the touch panels PA3 and PA4. Exposure underneath indicates that fatal deformation has occurred. On the other hand, in the touch panels PA1 and PA2, no deformation was observed even when the touch panels were left at room temperature after the completion of the 100-cycle experiment.
[0070]
Further, the touch panel PA3 has reached 1.1 times the initial value when the inter-terminal resistance is about 20 cycles, and has reached twice the initial value in the touch panel PA4. Excellent stability twice as much
In the touch panels PA3 and PA4, depending on the electrode wiring structure, the terminal-to-terminal resistance reaches three times the initial resistance in about 20 cycles. In the touch panels PA1 and PA2, such a change in resistance due to the difference in the wiring structure was not recognized.
[0071]
【The invention's effect】
As described above, the touch panel of the present inventionThe first and second planar members are made of resin,The first planar member includes a conductive layer forming member and a supporting member that supports the conductive layer forming member.LaminatedAn amorphous polyolefin resin sheet is used for the second planar member and the conductive layer forming member, and the linear expansion coefficient of the second planar member and the conductive layer forming member is The difference from the linear expansion coefficient is 1 × 10^-FiveUse a member that is within / ° C.
[0072]
As described above, an amorphous polyolefin-based resin sheet is used for the second planar member and the conductive layer forming member, and the line of the second planar member and the conductive layer forming member is used for the supporting member that supports the conductive layer forming member. Since a transparent sheet having a difference from the expansion coefficient of 1 × 10 −5 / ° C. or less is used, a touch panel having a wide temperature range, light weight, and impact resistance can be realized.
[Brief description of the drawings]
FIG. 1 is an exploded view of a touch panel according to an embodiment.
FIG. 2 is a cross-sectional view of the touch panel.
[Explanation of symbols]
1 Touch panel
10 Touch-side board
11 Hard coat layer
12 Conductive layer forming member
13 Conductive layer
20 Display side substrate
21 Hard coat layer
22 Supporting members
23 Conductive layer forming member
24 conductive layer
25 adhesive layer
30 Spacer
31 Air layer
40 adhesive
131,132 electrode
133, 134 Connector electrode
135,136 Wiring pattern
241, 242 electrodes
243,244 Connector electrode
245,246 Wiring pattern

Claims (4)

In a resistive touch panel in which first and second planar members made of resin are opposed to each other at regular intervals, and a conductive layer is formed on opposing inner surfaces of both members,
The first planar member includes a conductive layer forming member having a conductive layer formed on the surface, together with the support member for supporting the formed by laminating, on the second planar member and the conductive layer forming member, An amorphous polyolefin resin sheet is used,
The resistive touch panel according to claim 1, wherein a difference between a linear expansion coefficient of the support member and a linear expansion coefficient of the second planar member and the conductive layer forming member is within 1 × 10 ⁻⁵ / ° C. The resistive touch panel according to claim 1, wherein the support member is an amorphous polyolefin-based resin sheet, a polycarbonate-based resin sheet, or an acrylic resin sheet. The resistive touch panel according to claim 1, wherein the amorphous polyolefin-based resin sheet is formed by a solvent casting method or a melt extrusion method. The surface roughness of at least one of the conductive layers provided on the first and second planar members is 0.05 to 2 μm and the maximum height is 0 in the evaluation of the center line surface roughness in JIS standard . . resistive film type touch panel according to any one of claims 1 to 3, characterized in that it is set in the range of 6～3Myuemu.

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