JPH06202789A - Plotting pad and manufacturing method for the same - Google Patents

Abstract

PURPOSE:To make an electrode difficult to be damaged against the many times of sliding input with an input pen, and to input a picture with a smaller writing pressure than a conventional plotting pad by processing at least one electrode face with a specific insulating chain organic compound. CONSTITUTION:The surface of an electrode 11 is processed with the chain organic polymer compound having an organoleptic base to be connected with an electrode material, and an insulating chain organic polymer layer 13 is formed on the surface of the electrode 11. The chain organic polymer compound forming the insulating chain organic polymer layer 13 is chemically connected with the electrode material forming the electrode 11, and the surface of the electrode 11 is apparently covered with the beard or network-shaped insulating chain organic polymer compound. Therefore, the insulating chain organic polymer layer 13 is formed on at least one of the surfaces of electrodes 11 and 12, so that the faces of the electrodes 11 and 12 of upper and lower substrates 14 and 15 can be mutually connected, and a plotting pad 1 can be constituted. Thus, the surface of the electrode can be processed, and friction resistance can be excellent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drawing pad suitable for inputting a handwritten image. More specifically, the electrode formed on a substrate is less likely to be damaged even when sliding input is made many times by an input pen. Moreover, the present invention relates to a drawing pad that allows an image to be input with a writing pressure smaller than that of a conventional drawing pad.

[0002]

2. Description of the Related Art Conventionally, a drawing pad (touch panel) is known which comprises a pair of substrates with electrodes and is arranged at regular intervals with insulating spacers so that the electrode surfaces of the substrates face each other. ing. As a substrate for such a drawing pad, a transparent substrate such as a glass plate or a plastic film is usually used. In addition, a transparent conductive film such as ITO is usually formed as an electrode on one surface of these substrates. Further, at least one of the pair of substrates with electrodes has flexibility.

In such a drawing pad, when the substrate of the substrate with electrodes on the input side is pressed by the input pen, the pressing portion is bent or distorted, and the electrodes formed on both substrates come into contact with each other at the pressing portion. To do. Therefore, when a character, a figure, or the like is drawn on the substrate of the substrate with the input side electrode by the input pen, the electrodes formed on both the substrates come into contact with each other according to the locus of the slide of the input pen. Then, the position coordinates (x, y) along the sliding locus are electrically detected, and the image is input to the drawing pad.

In the process of inputting an image on the drawing pad in this manner, the electrode surface formed on the flexible substrate slightly rubs in accordance with the movement of the input pen, and as a result, the electrode surface is formed on both substrates. When the contacted electrodes contact each other, friction occurs between these electrodes at the contact portion.

Due to such repeated friction, the conventional drawing pad has a problem that the electrodes formed on at least one of the substrates are damaged when input is repeated many times.

Further, the conventional drawing pad has a problem that a sufficient image cannot be input to the drawing pad unless the writing pressure is increased.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in order to overcome the above-mentioned problems of the prior art, and the electrodes formed on the substrate are damaged even when the drawing pad is slid many times by an input pen. It is an object of the present invention to provide a drawing pad that is difficult to perform and that allows an image to be input with a writing pressure smaller than that of a conventional drawing pad, and a manufacturing method thereof.

[0008]

SUMMARY OF THE INVENTION A drawing pad according to the present invention is a drawing pad in which two substrates having electrodes formed on one surface are arranged so that the electrodes face each other. One of the electrode surfaces is characterized by being treated with an insulating chain organic compound having a functional group capable of binding to the electrode material.

The drawing pad according to the present invention comprises a pair of coating liquids obtained by dissolving or dispersing a chain organic polymer compound having a functional group capable of binding to an electrode material in an organic solvent. Of at least one of the electrodes, and then the substrate having the electrode coated with the coating solution is heated and dried, thereby treating the electrode surface with an insulating chain organic polymer compound. It can be manufactured including steps.

The drawing pad according to the present invention has at least one of a pair of electrodes in which a drawing pad contains a coating solution containing a compound having an inorganic reactive group and an organic reactive group in the same molecule. Of the organic reactive group and a chain-like organic polymer compound reactive with the organic reactive group is applied to the electrode surface, and then the substrate with an electrode coated with the coating solution is applied. It can also be manufactured by including a step of heating and drying, thereby treating the electrode surface with an insulating chain organic polymer compound.

[0011]

DETAILED DESCRIPTION OF THE INVENTION The drawing pad according to the present invention will be specifically described below with reference to the drawings. FIG. 1 shows an example of a drawing pad according to the present invention.

In this drawing pad, an upper substrate 14 (input side) on which an electrode 11 is formed and a lower substrate 15 on which an electrode 12 is formed are connected via an insulating chain organic polymer layer 13 to the electrode 11, 12 are opposed to each other and are arranged such that the distance between the electrodes 11 and 12 is constant.

The upper substrate 14 shown in FIG. 1 is made of a material having a certain degree of flexibility, for example, a plastic film such as polyethylene terephthalate film (hereinafter referred to as PET film). Images such as characters and figures can be input with an input pen (not shown).
For example, an electrode 11 made of a conductive thin film such as an ITO thin film
Are formed.

Upper substrate 14 on which this electrode 11 is formed
Is not particularly limited as long as it bends or distorts to the extent that the upper and lower electrodes at the position pressed by the tip of the input pen come into contact with each other when drawing with the input pen. The thickness of the upper substrate 14 that satisfies these conditions, including the thickness of the electrode 11, is preferably 50 μm to 1 mm.

The lower substrate 15 is made of a glass substrate or the like, and an electrode 12 made of a conductive thin film such as an ITO thin film is formed on the surface of the substrate 15. The lower substrate 15 may be flexible or rigid and is not particularly limited, but is preferably a transparent substrate such as glass.

In the drawing pad 1 shown in FIG. 1, the surface of the electrode 11 is treated with a chain organic polymer compound having a functional group capable of binding to an electrode material, whereby the surface of the electrode 11 is made of an insulating chain organic compound. The polymer layer 13 is formed. Each chain organic polymer compound forming this insulating chain organic polymer layer 13 is chemically bonded to the electrode material forming the electrode 11, whereby the surface of the electrode 11 is whisker-like or net-like. Is apparently coated with the insulating chain organic polymer compound.

In the drawing pad 1 of FIG. 1, the insulating chain organic polymer layer 13 is formed only on the upper substrate 14, but it may be formed on the lower substrate 15 or both the upper and lower substrates 14 and 15. good.

In the conventional drawing pad, the upper substrate 1 described above is used.
4 and the lower substrate 15 are arranged so that the electrodes 11 and the electrodes 12 formed on the lower substrate 4 and the lower substrate 15 are spaced apart from each other and face each other.
Since the insulating chain organic polymer layer 13 is formed on at least one of the surfaces 1 and 12, both upper and lower substrates 1
The drawing pad 1 can be constructed by bringing the surfaces 11 and 12 of the electrodes 4 and 15 into contact with each other. Even when the upper and lower substrates 14 and 15 are in contact with each other to form the drawing pad 1 as described above, no conduction occurs between the electrodes 11 and 12 unless a load is applied to one of the upper and lower substrates.

Of course, like the conventional pad, the upper and lower substrates 1
There is no problem even if a spacer is interposed between 4 and 15. The chain organic polymer compound used for the surface treatment of the electrode as described above has at least one functional group capable of binding to the electrode material per molecule at the molecular end and / or the molecular chain.

Examples of the chain organic polymer compound forming the main chain of the chain organic polymer compound having a functional group capable of binding to such an electrode material include polyethylene, polypropylene, polystyrene, polyvinyl chloride and poly Vinyl acetate, polyvinyl acetal, polyacrylic acid, polymethacrylic acid, polyacrylic acid ester such as polymethyl acrylate, polymethacrylic acid ester such as polymethyl methacrylate, polyacrylonitrile, polyacrylamide, polytetrafluoroethylene, polyvinylidene fluoride , Polybutadiene, polyisoprene, propylene / ethylene copolymer, ethylene / vinyl acetate copolymer, polycarbonate, polyethylene terephthalate, aromatic polyester, polyethylene oxide and the like.

A transparent drawing pad is widely used as a drawing pad, and electrodes made of an inorganic compound such as ITO are formed on the upper and lower substrates of the transparent drawing pad. As the functional group, a chain organic polymer compound having a group reactive with an inorganic compound (hereinafter referred to as an inorganic reactive group), for example, a hydroxyl group or an alkoxy group, is used as a functional group capable of binding to an electrode material. As such an inorganic reactive group, for example, the following formula [I]:

[0022]

[Chemical 2]

(Wherein R ₁ , R ₂ and R ₃ are each independently a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, a and b are each an integer of 0 to 2 and c is an integer of 1 to 3, which is a + b + c = 3. functional group is preferably represented by), -OR ³ group in the formula [I] (hydroxyl group or an alkoxy group) inorganic compound forming an electrode at the site Combine with. Furthermore, instead of Si, Ti
Alternatively, a functional group composed of Zr can also be used.

When the electrode surface is treated with a chain polymer compound having such a functional group at the molecular end, the electrode surface is covered with a whisker-like (fibrous) polymer compound, and When the electrode surface is treated with a polymer compound having a functional group in the molecular chain, the electrode surface is covered with a reticulated compound.

The number average molecular weight of the chain organic polymer compound having a functional group capable of binding to the electrode material is 1,000.
~ 200,000, especially 10,000-100,000
Is preferred. In the drawing pad having the chain organic polymer compound having a number average molecular weight of less than 1,000 between electrodes, the friction generated between the electrodes of the drawing pad when the image is input to the drawing pad by the input pen is sufficiently small. Can not do it. Therefore, with the drawing pad having such a chain organic polymer compound between the electrodes, it is not possible to sufficiently reduce the damage to the electrodes that occurs when the sliding input is repeated many times with the input pen. Conversely, the number average molecular weight is 20
With a drawing pad having more than 10,000 chain organic polymer compounds between electrodes, the input load when performing pen input may become too high or input may not be possible.

Among the chain organic polymer compounds having a functional group capable of binding to the electrode material, the chain organic polymer compound used for the surface treatment of the electrode formed of an inorganic compound such as ITO is a silane cup. A compound having an inorganic reactive group and an organic reactive group in the same molecule, such as a ring agent or a titanium coupling agent, and a chain organic polymer compound having a functional group reactive with the organic reactive group. Is synthesized from.

Here, a silane coupling agent will be described as an example. a) First, a functional group that is reactive with a group such as an amino group, a vinyl group, an epoxy group of a silane coupling agent at the molecular end and / or the molecular chain of the above chain organic polymer compound. To introduce. For example, for a silane coupling agent having an amino group, a carboxyl group reactive with the amino group is introduced at the molecular end and / or the molecular chain of the above chain organic polymer compound.

B) Next, the chain organic polymer compound having such a functional group introduced therein is reacted with a silane coupling agent. In the present invention, as a method of treating the electrode surface with a chain organic polymer compound having a functional group capable of binding to the electrode material synthesized by the above method, the chain polymer compound is in an organic solvent. A coating solution that is dissolved or dispersed in
Coating is performed on the electrode surface of the electrode-attached substrate by a coating means such as a bar coater, a spinner, a roll coater, or dipping, and then heating and drying.

For the coating liquid as described above, for example, an organic solvent having a relatively low boiling point such as ethanol, isopropanol, butanol, acetone, methyl ethyl ketone and ethyl acetate is preferably used. These organic solvents may be used alone or in admixture of two or more.

The concentration of the chain organic polymer compound contained in the coating liquid is preferably 0.1 to 10% by weight. The scratch resistance of both electrodes of the drawing pad and the minimum input load required for image input are adjusted by the type and concentration of the chain organic polymer compound.

For example, when the concentration of the chain organic polymer compound is less than 0.1, the amount of the insulating chain organic polymer compound bonded to the electrode surface is insufficient, resulting in drawing. Sufficient scratch resistance may not be imparted to both electrodes of the pad. On the contrary, when the concentration of the chain organic polymer compound exceeds 10% by weight, the amount of the insulating chain organic polymer compound bonded to the electrode surface becomes large, and when the image is input to the drawing pad. A large input load is required, and if the amount of the insulating chain organic polymer compound is too large, the input pen cannot be used to input on the drawing pad, no matter how large the input load is.

When a substrate with an electrode coated with such a coating solution is heated and dried, the temperature on the electrode surface is 100 to 150.
C. is preferred. Further, as a method of treating the electrode surface with the chain polymer compound, the following method is also possible.

First, a coating liquid containing a compound having an inorganic reactive group and an organic reactive group in the same molecule, such as a silane coupling agent, is applied to the electrode surface to form an inorganic reactive group of this compound. React with electrode material. Then, a coating solution containing a chain organic polymer compound in which a functional group showing reactivity with the organic reactive group is introduced into the molecular end or the molecular chain by the method as described above on the electrode surface coated with this compound. By coating and reacting the functional group of the chain organic polymer compound with the organic reactive group contained in the compound such as a silane coupling agent, the chain organic polymer compound is treated with the insulating chain polymer compound. The electrode is obtained.

[0034]

As is apparent from the above description, according to the present invention, at least one of the pair of electrodes of the drawing pad is a surface formed of a chain organic polymer compound having a functional group capable of binding to the electrode material. Since the insulating chain polymer compound layer is formed on the treated and surface-treated electrode surface, the electrode of the transparent electrode plate is less likely to be damaged even if the sliding input with the input pen is repeated many times on the drawing pad. . Therefore, the drawing pad according to the present invention is excellent in scratch resistance and can perform sliding input repeatedly many times.

Further, the drawing pad according to the present invention can input an image with a writing pressure smaller than that of the conventional drawing pad. The present invention will be described below with reference to examples, but the present invention is not limited to these examples.

[0036]

Examples 1-a) Synthesis of Chain Polymer A To a four-necked flask, 20 g of polyoxyethylene methyl ether (POE) having a number average molecular weight of 5.0 × 10 ³ and 8 g of succinic anhydride were added. Then, after degassing the inside of the four-necked flask, nitrogen gas was introduced into the inside of the four-necked flask, whereby the atmosphere inside the four-necked flask was made a nitrogen gas atmosphere. Thereafter, 120 g of 1,2-dichloroethane as a solvent and 1 g of pyridine as a catalyst were added to the inside of the four-necked flask. 8 of these mixtures
The mixture was stirred at 0 ° C. for 72 hours, the obtained reaction mixture was suction filtered, and the filtrate was collected. From the filtrate, 1,2-dichloroethane and pyridine were removed by an evaporator to obtain a white powdery reaction product. This white powder was dissolved in 40 g of water, diethyl ether was added to the obtained aqueous solution, and then this liquid was separated into an aqueous phase and an organic phase. Chloroform was added to the obtained aqueous phase, then, the aqueous phase and the chloroform phase were separated, and the reaction product contained in the aqueous phase was extracted with chloroform. The reaction product obtained by evaporating and removing chloroform from this chloroform phase is dissolved in benzene, then diethyl ether is added to a benzene solution of this reaction product, and the resulting solution is ice-cooled to produce a purified reaction product. A white precipitate of the product was obtained. The white precipitate was suction filtered and then dried under reduced pressure to obtain a purified polyoxyethylene methyl succinate having a carboxyl group.

While the ice-cooled eggplant-shaped flask containing a mixture of 10 g of the polyoxyethylene methyl succinate thus obtained, 400 g of chloroform as a solvent and 1.06 g of dicyclohexylcarbodiimide as a catalyst, the mixture was stirred for 2 hours. It was stirred. After stirring, 1.36 g of aminopropyltriethoxysilane was added to the mixture, and the mixture was allowed to react at 5 ° C. for 24 hours in a stationary state. Then, after chloroform is evaporated and removed from the obtained reaction mixture, benzene is added to this reaction mixture to obtain a benzene solution of the reaction product, diethyl ether is added to this benzene solution, and the obtained solution is ice-cooled. As a result, a white precipitate of the reaction product was obtained. The white precipitate was dissolved in ethyl acetate, and the undissolved precipitate in the ethyl acetate solution was removed by suction filtration. The ethyl acetate in this filtrate was evaporated and removed by an evaporator, and the obtained solid was dried under reduced pressure to obtain a chain polymer compound A having POE as a main chain. 1-b) Synthesis of Chain Polymer B After degassing the inside of the three-necked flask, nitrogen gas was introduced into the inside of the three-necked flask, whereby the atmosphere inside the three-necked flask was changed to the nitrogen gas atmosphere. . Then, the styrene 20 purified by the vacuum distillation method was placed inside the three-necked flask.
g, 3-mercaptopropionic acid 0.4 g, 2,2'-
0.82 g of azobisisobutyronitrile and 40 g of dry tetrahydrofuran as a solvent were added. Then, after stirring these mixtures at 70 ° C. for 6 hours for reaction,
The solvent was evaporated and removed from the obtained reaction mixture to obtain a white powdery reaction product. The white powder was dissolved in benzene, and methanol was added to the obtained benzene solution and ice-cooled to obtain a white precipitate of the reaction product. The white precipitate is suction filtered and then dried under reduced pressure to obtain polystyrene (PS having a carboxyl group at the molecular end).
t) 16.3 g of a purified product was obtained. The number average molecular weight of the obtained PSt was measured by gel permeation chromatography (GPC) method to be 1.2 × 10 ⁴ .

PSt 5.75 thus obtained
g, a mixture of 100 g of chloroform as a solvent and 0.1 g of dicyclohexylcarbodiimide as a catalyst in an eggplant-shaped flask while cooling with ice.
Stir for hours. After stirring, 0.13 g of aminopropyltriethoxysilane was added to the mixture, and the reaction was allowed to stand at 5 ° C. for 24 hours. Then, after chloroform was evaporated and removed from the obtained reaction mixture, benzene was added to this reaction mixture to obtain a benzene solution of the reaction product, methanol was added to this benzene solution, and the obtained solution was ice-cooled. A white precipitate of the reaction product was obtained. The white precipitate was dissolved in ethyl acetate, and the undissolved precipitate in the ethyl acetate solution was removed by suction filtration. Ethyl acetate in this filtrate was evaporated and removed by an evaporator, and the obtained solid was dried under reduced pressure to obtain a chain polymer compound B having PSt as a main chain. 1-c) Synthesis of Chain Polymer C After degassing the inside of the three-necked flask, nitrogen gas was introduced into the inside of the three-necked flask, whereby the atmosphere inside the three-necked flask was changed to the nitrogen gas atmosphere. . Then, 5 g of methyl methacrylate and 0.14 of 3-mercaptopropionic acid purified by a vacuum distillation method were placed inside the three-necked flask.
g, 2,2'-azobisisobutyronitrile 0.07 g
And 10 g of dry tetrahydrofuran was added as a solvent. Then, these mixtures were reacted by stirring at 60 ° C. for 3 hours, and then the solvent was evaporated and removed from the obtained reaction mixture to obtain a white powdery reaction product. This white powder was dissolved in benzene, and hexane was added to the resulting benzene solution and ice-cooled to obtain a white precipitate of the reaction product. The white precipitate was suction filtered and then dried under reduced pressure to obtain 3.3 g of a purified product of polymethylmethacrylate (PMMA) having a carboxyl group at the molecular end.
The number average molecular weight of the obtained PMMA was measured by GPC method to be 8.5 × 10 ³ .

The mixture thus obtained was stirred for 2 hours while ice-cooling a eggplant-shaped flask containing a mixture of 2 g of PMMA thus obtained, 100 g of chloroform as a solvent and 0.049 g of dicyclohexylcarbodiimide as a catalyst. After stirring, 0.13 g of aminopropyltriethoxysilane was added to the mixture, and the reaction was allowed to stand at 5 ° C. for 24 hours. Then, after chloroform was evaporated and removed from the obtained reaction mixture, benzene was added to this reaction mixture to obtain a benzene solution of the reaction product, hexane was added to this benzene solution, and the obtained solution was ice-cooled. A white precipitate of the reaction product was obtained. The white precipitate was dissolved in ethyl acetate, and the undissolved precipitate in the ethyl acetate solution was removed by suction filtration. Ethyl acetate in this filtrate was evaporated and removed by an evaporator, and the obtained solid was dried under reduced pressure to obtain a chain polymer compound C having PMMA as a main chain. 1-d) Synthesis of Chain Polymer Compound D After degassing the inside of the three-necked flask, nitrogen gas was introduced into the inside of the three-necked flask, whereby the atmosphere inside the three-necked flask was made a nitrogen gas atmosphere. . Thereafter, vinyl acetate 1 purified by the vacuum distillation method was placed inside the three-necked flask.
5 g, 4,4'-azobis (4-cyanoisovaleric acid)
0.15 g and 5 g of methanol as a solvent were added.
Then, these mixtures were reacted by stirring at 60 ° C. for 4 hours, and then the solvent was evaporated and removed from the obtained reaction mixture to obtain a white powdery reaction product. This white powder was dissolved in dioxane, diethyl ether was added to the obtained dioxane solution, and the mixture was ice-cooled to obtain a white precipitate of the reaction product. The white precipitate was suction filtered and then dried under reduced pressure to obtain 12.1 g of a purified product of polyvinyl acetate (PVAc) having a carboxyl group at the molecular end.
The number average molecular weight of the obtained PVAc was measured to be 1.3 × 10 ⁵ by GPC method.

While the eggplant-shaped flask containing the mixture of 6 g of PVAc thus obtained and 100 g of chloroform as a solvent was ice-cooled, the mixture was stirred for 2 hours. After stirring, 0.026 g of aminopropyltriethoxysilane was added to the mixture, and the mixture was allowed to react at 5 ° C. for 24 hours in a stationary state. Then, after chloroform is evaporated and removed from the obtained reaction mixture, dioxane is added to this reaction mixture to obtain a dioxane solution of the reaction product, diethyl ether is added to this dioxane solution, and the obtained solution is cooled with ice. As a result, a white precipitate of the reaction product was obtained. The white precipitate was dissolved in ethyl acetate, and the undissolved precipitate in the ethyl acetate solution was removed by suction filtration. Ethyl acetate in this filtrate was evaporated and removed by an evaporator, and the obtained solid was dried under reduced pressure to obtain a chain polymer compound D having PVAc as a main chain.

[0041]

Example 1 A molded article of indium oxide containing 5% by weight of tin oxide was used with an electron gun of 2 kW and an oxygen partial pressure of 3 × 10 ^−4.
1 torr at a deposition rate of 3 Å / sec
It was vapor-deposited on a polyethylene terephthalate (PET) film having a thickness of 125 μm preheated to 00 ° C. to obtain a PET film F ₀ having a transparent electrode.

Then, instead of the PET film, the thickness is 1.1.
A glass substrate G ₀ on which a transparent electrode was formed was obtained in the same manner as above except that a glass substrate of mm was used and the glass substrate was preheated to 400 ° C.

50 g of the above chain polymer compound A was gradually added to 950 g of tetrahydrofuran while stirring at room temperature to obtain a dispersion liquid of the chain polymer compound A. After the PET film with electrode F ₀ was immersed in this dispersion, the PET film with electrode was pulled up from this dispersion at a rate of 2 mm / sec, and then heated and dried at 120 ° C. for 30 minutes to obtain the electrode surface. To obtain a PET film F ₁ with an electrode treated with a chain polymer compound.

Metal balls having a diameter of 10 mm were placed on the electrode surface of the PET film F ₁ with electrodes, and 20 balls were placed on each metal ball.
The friction coefficient and scratch resistance when a vertical load of g, 40 g, 60 g and 80 g was applied were measured with a surface property tester (HAIDON-14 manufactured by Shinto Chemical Co., Ltd.). For scratch resistance, after sliding the metal ball once on the electrode surface while applying the above load, observe with a microscope whether this electrode surface is scratched, and the electrode surface is not scratched. In this case, the scratch resistance was evaluated as good.

The results are shown in Table 1. Next, the glass substrate with electrode G ₀ and the PET film with electrode F ₁ are arranged so that their respective electrode surfaces are in contact with each other through the chain polymer compound, and the electrode of the PET film with electrode F ₁ is used as the upper electrode. A drawing pad having the electrode of the glass substrate with electrodes G _{0 as} the lower electrode was manufactured.

The following characteristics of the obtained drawing pad were evaluated. (1) Necessary input load The PET film on which the upper electrode is formed is pressed by a polyacetal resin presser having a radius of curvature R of 1 mm and 2 mm to apply a load perpendicular to the PET film, respectively, and gradually load the load. While increasing, measure the resistance between the upper and lower electrodes, obtain the load value when this resistance becomes 2 kΩ or less, and load value required to input this load value on the drawing pad screen with the input pen. Evaluated as.

(2) Durability 300 g of PET film having the upper electrode formed thereon
This ball-point pen was reciprocally slid on the PET film while being pressed with a commercially available ball-point pen under a load of 1, and the number of reciprocations until the linearity of this pad became defective was evaluated as durability.

(3) Input state The PET film on which the upper electrode is formed is pressed by a polyacetal resin presser having a radius of curvature R of 2 mm at the tip end to apply a load of 200 g perpendicular to the PET film, respectively, The input position and the display position when writing the figure and the presence or absence of the input missing part were observed, and when the input position and the display position were not displaced and there was no input missing part, the input state was evaluated as good.

The results are shown in Table 2.

[0050]

Example 2 5 g of the above chain polymer compound B was gradually added to 995 g of tetrahydrofuran while stirring at room temperature to obtain a dispersion liquid of the chain polymer compound B.

After the PET film with electrode F ₀ obtained in Example 1 was dipped in this dispersion, the PET film with electrode was pulled up from this dispersion at a speed of 1 mm / sec, and then at 120 ° C. for 30 minutes. By heating and drying,
An electrode-attached PET film F ₂ having an electrode surface treated with a chain polymer was obtained.

The friction coefficient of the electrode surface of the PET film with electrode F ₂ and the scratch resistance were evaluated in the same manner as in Example 1. The results are also shown in Table 1.

A drawing pad was produced in the same manner as in Example 1 except that the electrode-attached PET film F ₂ was used, and the necessary input load, durability and input state of the obtained drawing pad were the same as in Example 1. Measured and evaluated.

The results are also shown in Table 2.

[0055]

Example 3 20 g of the chain polymer compound C was gradually added to 980 g of tetrahydrofuran while stirring at room temperature to obtain a dispersion liquid of the chain polymer compound C.

After the PET film with electrode F ₀ obtained in Example 1 was immersed in this dispersion, the PET film with electrode was pulled up from this dispersion at a rate of 2 mm / sec, and then at 120 ° C. for 30 minutes. By heating and drying,
An electrode-attached PET film F ₃ having an electrode surface treated with a chain polymer was obtained.

The friction coefficient and scratch resistance of this electrode-attached PET film F ₃ electrode surface were measured and evaluated in the same manner as in Example 1. The results are also shown in Table 1.

A drawing pad was produced in the same manner as in Example 1 except that the PET film with electrode F ₃ was used, and the necessary input load, durability and input state of the obtained drawing pad were the same as in Example 1. Measured and evaluated.

The results are also shown in Table 2.

[0060]

Example 4 3 g of the chain polymer compound D was gradually added to 997 g of tetrahydrofuran with stirring at room temperature to obtain a dispersion liquid of the chain polymer compound D.

After the PET film with electrode F ₀ obtained in Example 1 was immersed in this dispersion, the PET film with electrode was pulled up from this dispersion at a rate of 2 mm / sec, and then at 120 ° C. for 30 minutes. By heating and drying,
An electrode-attached PET film F ₄ having an electrode surface treated with a chain polymer was obtained.

The friction coefficient and scratch resistance of this electrode-attached PET film F ₄ electrode surface were measured and evaluated in the same manner as in Example 1. The results are also shown in Table 1.

A drawing pad was manufactured in the same manner as in Example 1 except that the PET film with electrode F ₄ was used, and the necessary input load, durability and input state of the obtained drawing pad were the same as in Example 1. Measured and evaluated.

The results are also shown in Table 2.

[0065]

Comparative Example 1 The PET film with electrode F ₀ obtained in Example 1 was evaluated for friction coefficient and scratch resistance on the electrode surface in the same manner as in Example 1.

The results are also shown in Table 1.

[0067]

Comparative Example 2 Glass substrate with electrode G obtained in Example 1₀
By heating the temperature of the electrode surface formed on the glass substrate.
While maintaining at 60 ℃, on the electrode surface, polyester resin
(Byron Co., Ltd. Byron) 40 parts by weight methyl ethyl
The coating solution contained in 960 parts by weight of luketone was sprayed.
From, spray flow rate 30ml / min, pressure 2kg / cm ²
After spraying for 1 minute at a distance of 1 m from the electrode surface,
Dry at 20 ° C and apply hemispherical insulating dot spacers.
Formed.

The height G of this dot spacer is 3 μm, and the diameter d of the dot spacer on the electrode surface is 10 μm.
The average distance L between adjacent dot spacers was 60 μm. In addition, d and L were obtained by taking an electron micrograph of the electrode surface on which the dot spacers were formed and averaging the measured values of the 10 dot spacers. Further, G was obtained by measuring with a stylus type surface roughness meter.

The apex of the dot spacer of the glass substrate G ₁ with an electrode and the PET film F with an electrode obtained in Example 1
_The drawing pad was manufactured by arranging so that the electrode surface of ₀ was in contact, and the required input load, durability and input state of the obtained drawing pad were measured and evaluated in the same manner as in Example 1.

The results are also shown in Table 2.

[0071]

[Table 1]

[0072]

[Table 2]

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of a drawing pad according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Drawing pad 11 ... Upper electrode 12 ... Lower electrode 13 ... Insulating chain organic polymer layer 14 ... Upper substrate 15 ... Lower substrate

Claims (4)

[Claims] 1. A drawing pad comprising two substrates each having an electrode formed on one surface thereof so that the respective electrodes face each other. At least one electrode surface of the two substrates has an electrode material. A drawing pad, which is treated with an insulating chain organic compound having a functional group capable of binding with. 2. A functional group capable of binding to the electrode material is represented by the following formula [I]: (In the formula, R ₁ , R ₂ and R ₃ are each independently a hydrogen atom or an alkyl group having 1 to 4 carbon atoms,
a and b are each an integer of 0 to 2, c is an integer of 1 to 3, and a + b + c = 3. ), And the chain organic polymer compound has a number average molecular weight of 1,000 to 2
The drawing pad according to claim 1, wherein the drawing pad is 0,000. 3. A chain organic material having a functional group capable of binding to an electrode material when a drawing pad is manufactured by arranging two substrates having electrodes formed on one surface so that the electrodes face each other. A coating solution obtained by dissolving or dispersing a polymer compound in an organic solvent is applied on at least one electrode surface of the two substrates,
Next, a method for producing a drawing pad, which comprises the step of drying the applied electrode surface and thereby treating the electrode surface with an insulating chain organic polymer compound. 4. An inorganic reactive group and an organic reactive group are formed in the same molecule when a drawing pad is manufactured by arranging two substrates each having an electrode formed on one surface so that the electrodes face each other. And a coating solution containing a chain organic polymer compound having a functional group reactive with the organic reactive group is coated on at least one electrode surface of the two substrates. A method for producing a drawing pad, which comprises the steps of applying on the electrode surface, drying the applied electrode surface, and thereby treating the electrode surface with an insulating chain organic polymer compound.