KR0158915B1 - Drawing pad and its manufacturing method - Google Patents

Abstract

The present invention includes a pair of substrates having electrodes formed on each side thereof, and the single substrates are arranged in parallel so that the electrodes face each other at a predetermined interval between the substrates by several insulating dot spacers. The present invention relates to a writing pad having a dot spacer fixed to at least one side thereof on at least one side thereof and a method of manufacturing the same. The height G of the above-described dot spacers is 15 µm or less, and the average distance L between the centers of adjacent dot spacers is 100 µm or less, and furthermore, dG and 3dL100d (where d is a difference between the electrode surfaces to which the dot spacers are fixed). Diameter of the dot spacer).

According to the drawing pad of the present invention, when a character or a figure is input to the input side board of the drawing pad by inputting ability, even if a finger or the like accidentally touches the input side board, input by mistake does not occur, and furthermore, input by a pen for input. Repeated several times does not cause a malfunction.

Description

[Name of invention]

Drawing pad and its manufacturing method

The present invention relates to a writing pad suitable for inputting a handwritten image. More specifically, the present invention does not cause a malfunction even when a user's finger or other body part touches the input board by mistake by inputting a character or a figure into the input board of the drawing pad with an input pen. It also relates to a writing pad that is durable against multiple repeated input operations and a method of manufacturing the same.

Conventionally, an electrode is attached to each, and a pair of upper and lower substrates which are arranged in parallel at a predetermined interval by several insulating dot spacers; When the upper flexible substrate is pressed by an input pen, a discriminating contact sensor with a position detecting circuit which electrically detects the position coordinates (x, y) of the pressed part has been known ( See US Patent No. 3,911,215. In such a sensor, when the input board (substrate with an upper electrode) on which the electrode of the drawing pad is attached is pressed with an input pen, the input board is pressed and bent under the pressure of the pen pressure, whereby the upper and lower sides of the drawing pad are pressed. The positive electrodes are in electrical contact with each other in contact with each other. As a result, the position coordinates (x, y) of the substrate pressed by the tip of the input pen are detected by the position detection circuit.

By connecting such a position detection circuit of the sensor to a storage unit having an appropriate storage capacity, an input device of a copy matter can be obtained. In the input device of such a copy, the positional coordinates of the points constituting the input image are stored at a predetermined address of the storage device.

In addition, by connecting this storage device to a display unit, various position coordinates detected by the position detection circuit and stored in the storage device are input to the display device, and the mortals input to the drawing pad are displayed on the display screen of the display device. is reproduced on the display screen.

In the conventional drawing pad as described above, the upper and lower electrodes are connected by pressing the substrate with the input pen to bend the substrate. Therefore, in many cases, the distance between the dot and the spacing is 0.635 to It may be in the range of 1.9 mm or more.

According to the studies of the present inventors, in the conventional drawing pad in which the distance between the dot spacers is long and the input is caused by the bending of the upper substrate, the user's finger or other body part touches the input substrate at the time of input and the upper and lower electrodes are separated. There is almost no difference between the load caused by mistake due to contact with each other (input load due to mistake) and the load required when inputting a character or the like with an input pen, so that malfunctions are frequently caused by input by mistake.

In order to prevent such a mistaken input, the above-described US patent proposes a writing pad in which the distance between dot spacers and the height of dot spacers satisfy a certain relational expression. However, even if the relation is satisfied, it is difficult to completely prevent input by mistake.

In addition, the drawing pad repeats the bending operation of the input substrate every time it is input, causing disconnection or deformation of the electrodes formed on the input substrate, so that the upper and lower electrodes are not restored to their original state. There is also a problem of generating input noise.

In the conventional drawing pad, as the input pen moves in the process of inputting an image to the drawing pad, the electrodes formed on the flexible substrate are slightly pushed so that the electrodes formed on the substrate are in contact with each other. Friction occurs between the electrodes. This friction occurs repeatedly each time an input is made with the input pen, which is susceptible to damage to the electrodes on at least one substrate, which is another problem with conventional writing pads.

SUMMARY OF THE INVENTION The present invention has been made to overcome the above-mentioned problems of the prior art, and an object of the present invention is to input a character or a figure into an input board of a drawing pad with an input pen. The present invention provides a writing pad and a method of manufacturing the same, which do not cause an input by mistake even when the input substrate is touched, and which does not cause a malfunction even if the input operation is repeated several times.

It is another object of the present invention to provide a writing pad and a method of manufacturing the electrode having a very good resistance to damage caused by repeated inputs by the input pens on the substrate.

The drawing pad of the present invention includes a pair of substrates each having electrodes formed on one side thereof, and the pair of substrates are arranged in parallel so that the electrodes are spaced apart from each other by a plurality of insulating dot spacers. It faces so that a dot spacer is fixed to at least one surface of both electrode surfaces. Here, the height G of the dot spacer is 15 μm or less, the diameter d of the dot spacer on the electrode surface on which the dot spacer is fixed is larger than G (dG), and the average distance L between the centers of the adjacent dot spacers. ) Is less than 100μm, characterized in that 3dL100d.

Further, the dot spacers are preferably formed by mixing together of different average heights G ₁ and G ₂ (G ₁ G ₂₎ having the two types of insulating dot spacers.

Furthermore, in the drawing pad of the present invention, it is preferable that the distance L between the average centers of the dot spacers is changed in accordance with the radius of curvature (μm) of the tip portion of the input pen used when pressing the input board of the writing pad. It is preferable to adjust the average distance L between centers and / or the radius of curvature R of the tip of the input pen such that the average distance L between the centers of the dot space and the radius of curvature R satisfy the following relational expressions. .

L≤R / n

(Where n is an integer of 4 or more)

In the drawing pad of the present invention, a spacer-forming solution formed by dissolving and dispersing a non-conductive resin in an organic solvent is formed in a droplet form on a preheated electrode surface, and then the organic solvent is evaporated from the droplets. An insulating dot spacer having a height G of 15 μm or less, a diameter of the dot spacer on the electrode surface (d) is larger than G (Gd), and an average distance (L) between centers of adjacent dot spaces of 100 μm or less and 3dL100d. It is produced by a process comprising the step of forming on the electrode surface.

In the drawing pad of the present invention, it is preferable that at least one of the pair of electrodes described above is treated with an insulating chain organic polymer compound having a functional group capable of bonding with a stock forming the electrode.

Such a drawing pad is applied to at least one of the above-mentioned pair of electrodes by applying a coating liquid formed by dissolving and dispersing an insulating chain organic polymer compound having a functional group capable of bonding with an electrode material in a valuable solvent, followed by the coating liquid. The board | substrate which has this apply | coated electrode is heat-dried, and it manufactures by the process containing the process of treating an electrode surface with an insulating chain organic polymer compound.

In addition, the drawing pad includes at least one pair of electrodes in which a coating liquid containing a functional group (inorganic reactive group) reactive with an inorganic compound and a compound having a functional group (organic reactive group) reactive with an organic compound is contained in the same molecule. After applying to one side, the coating liquid containing a chain-like organic polymer compound having a functional group reactive with the organic semi-negative group which was successively described was applied to the electrode surface to which the first coating liquid was applied, and then the electrode to which the coating liquid was applied was attached. Heat-drying the substrate, and treating the electrode surface with an insulating chain-like organic polymer compound.

1 is a cross-sectional view showing an embodiment of a writing pad according to the present invention,

2 is a partially enlarged cross-sectional view of FIG.

3 is a cross-sectional view showing another embodiment of the writing pad according to the present invention.

* Explanation of symbols for main parts of the drawings

1A, 1B: drawing pad 2: input pen

11: upper electrode 12: lower electrode

13 Insulation Dot Spacer 14 Upper Board

15: lower substrate 16: insulative chain organic polymer compound layer

G: height of dot spacer d: diameter of dot spacer

L: distance between the centers of dot spacers

Best Mode for Carrying Out the Invention

The drawing pad of the present invention will be described in more detail with reference to the accompanying drawings.

1 illustrates one embodiment of a writing pad according to the present invention.

In the drawing pad 1A of the present invention, the upper substrate 14 (input side) on which the electrode 11 is formed and the lower substrate 15 on which the electrode 12 is formed are disposed so that the electrodes 11 and 12 face each other by a plurality of insulating dot spacers 13. It is arranged.

The upper substrate 14 shown in FIG. 1 is made of a material having some flexibility, for example, a plastic film such as a polyethylene terephthalate film (hereinafter referred to as PET film). The surface of the upper substrate 14 is suitable for inputting images such as letters and figures with an input pen, and an electrode 11 formed of a conductive thin film such as, for example, an ITO thin film is formed on the rear surface of the upper substrate 14.

The upper substrate 14 on which the electrodes 11 are formed may be any curved material so that the upper and lower electrodes come into contact with each other at a portion pressed by the tip of the input pen 2 when drawing an image with the input pen 2. The thickness of the upper substrate 14 that satisfies the above conditions is preferably 50 μm to 1 mm, in addition to the thickness of the electrode 11.

The lower substrate 15 may be formed of, for example, a glass substrate. On one side of the substrate 15, for example, an electrode 12 made of a conductive thin film such as an ITO thin film is formed.

The lower substrate 15 is not particularly limited and may be bent or not bent. However, in general, transparent substrates such as glass are preferred.

In the drawing pad 1A shown in FIG. 1, the dot spacer 13 is fixed in the state interspersed with the electrode 12 provided on the lower substrate 15. As shown in FIG. This is not limitative and may be fixed to the electrode 11 provided on the upper substrate 14, or may be fixed to both the electrodes 11 and 12.

In the present invention, the dot spacer does not need to be strongly bonded to the electrode surface by an adhesive or the like, and may be fixed only to such an extent that it does not move freely on the electrode surface in a proper manner. As such a method, for example, a method of forming a dot spacer made of a synthetic resin as described later and fusing the resin to an electrode surface is mentioned.

In the drawing pad 1A shown in FIG. 1, the dot spacer 13 is in contact with the electrode 11 at its distal end. For this reason, it is preferable that each spacer has the shape of a hemispherical shape or the shape of the mountain which is round at the top. If the distal end of the dot spacer is sharp, it may cause undesirable cracking and damage to the electrode.

In the drawing pad of the present invention, the dot spacer may be rigid so as not to be deformed at the portion pressed by the tip of the input pen. It is generally desirable to be flexible enough to be slightly twisted and deformed. The dot spacer is insulated so that the upper and lower electrodes do not pass electricity through the dot spacer. The dot spacer is preferably transparent like the upper and lower electrodes.

In the dot spacer used in the drawing pad of the present invention, as shown in FIG. 2, the height G of the dot spacer 13 is 15 µm or less, preferably 1 to 10 µm, and the fixed portion of the dot spacer, that is, the electrode 12 The diameter d of the dot spacer 13 at the portion in contact with the surface of is larger than G (dG), and preferably d ≧ 2G. When the dot spacer 13 satisfies the above relationship, when the upper substrate 14 is bent by being pressed by the input pen 2, the upper and lower electrodes 11 and 12 smoothly contact each other.

The average distance L between the centers of adjacent dot spacers 13 is in the range of 3dL100d to 100 μm or less, and preferably in the range of 4dL20d.

It is preferable that the distance G of the above-described dot spacer 13 has a substantially constant value in which the distance between the upper and lower electrodes 11 and 12 is the same throughout the entire electrode surface. Therefore, it is preferable to use a dot spacer having almost the same height. desirable.

However, in the present invention, a mixture of two or more kinds of dot spacers having different average heights may be used. In this case, when the height of the high dot spacer is G ₁ and the height of the lower dot spacer is G ₂ , it is preferable when G ₂ is ½ G _{1 or} more. It is also preferable that the weight ratio of the higher dot spacers to the lower group dot spacers in the dot spacers having different heights is in the range of 7/3 to 3/7. When inputting a character or a figure to a drawing pad using such a mixed dot spacer, even if a finger or a hand touches the upper substrate 14 of the drawing pad with a load greater than that of the input pen 2 (in the drawing) (Not shown), malfunctions do not occur, and therefore incorrect input to the image input device is more reliably prevented.

Also in this case, the heights G ₁ and G ₂ of the dot spacers are each 15 μm or less. In addition to La height G ₁ and G ₂ respectively, the diameter of the electrode surface of the dot spacers d ₁ and d ₂ having, in the relation between d ₁ and d ₂ G ₁ G _2. When the distance between the centers of adjacent dot spacers is L, regardless of the type of the dot spacers, i.e., even when d is d ₁ or d ₂ , the relationship of 3dL100d and L ≦ 100 μm must be satisfied, respectively.

In the drawing pad 1A of the present invention, the average distance L between the centers of the dot spacers 13 may vary depending on the radius of curvature R (μm) of the tip of the input pen 2 used when the upper substrate 14 of the drawing pad 1 is pressed. The average distance L between the centers of the dot spacers 13 preferably satisfies the following relational expression.

L≤R / n

(Wherein n is an integer of 4 or more).

As the input pen, any input pen can be used as long as it is an input pen normally used for image input in an input device of a copy matter. If the radius of curvature R of the tip of the input pen to be used is too small, it becomes difficult to write with the input pen on the upper substrate of the writing pad, and if R is too large, the pressing force (pen pressure load) required for input is increased. It is difficult to input smoothly. For this reason, it is preferable that the radius of curvature R of the tip end portion of the input pen is in the range of 0.1 mm to 2.5 mm.

The material constituting the insulating dot spacer is not particularly limited as long as it is an insulator. Preferably, for example, it is preferably composed of one or two or more non-conductive resins selected from acrylic resins, epoxy resins, urethane resins and polyester resins.

The above-described drawing pad of the present invention forms a spacer-forming solution formed by dissolving and dispersing a non-conductive resin in an organic solvent in a droplet form on a preheated electrode surface, and then evaporates the organic solvent from the droplet to obtain a height (G). Forming an insulative dot spacer on the electrode surface having a thickness of 15 μm or less, which is smaller than the diameter d on the electrode surface (Gd) and an average distance L between adjacent dot space centers is 100 μm or less, and 3dL100d. Are manufactured.

The method of forming and fixing the insulating dot spacer on the electrode surface will be described in detail, for example, by spraying a spraying solution formed by dissolving and dispersing the above-mentioned nonconductive resin in an organic solvent to form uniform droplets. After colliding a droplet on the electrode surface heated previously, the method of evaporating the organic solvent in a droplet is mentioned. According to this method, a hemispherical dot spacer is formed on the electrode surface.

The above-mentioned spray liquid is preferably an organic solvent capable of dissolving non-conductive resin, and particularly preferably a solvent having a relatively low boiling point such as ethanol, isopropanol, butanol, acetone, methyl ethyl ketone, ethyl acetate, and the like. These organic solvents are used individually or in mixture of 2 or more types.

The concentration of the resin component in the spray liquid depends on the type of resin component used. For example, when the resin component is a polyester resin, the concentration of the resin component in the spray liquid is preferably 1 to 10% by weight, and when the resin component is an acrylic resin, the resin component concentration in the spray liquid is 1-20. It is preferable that it is weight%.

In addition, particles of inorganic compounds such as silica, alumina, titanium dioxide and zirconium dioxide may be dispersed in the spray solution. In the case of dispersing the inorganic compound particles in the spray liquid, the inorganic compound particles used with respect to 100 parts by weight of the resin component are preferably in the range of 1 to 30 parts by weight. By using the inorganic compound particles in an amount in the above range and using the inorganic compound particles having a particle size smaller than the height of the spacers finally formed, the dot spacer made of the inorganic compound coated with the above non-conductive resin can be obtained. .

When spraying the said spray liquid on a predetermined electrode surface, it is preferable to preheat an electrode surface and to maintain it at a fixed temperature. At this time, it is preferable that the temperature on an electrode surface is about 100 degrees C or less. The height, diameter, and distance between the dot spacers formed on the electrode surface can be adjusted by adjusting the concentration of solids contained in the spray liquid, the spray flow rate of the spray liquid, the spray pressure, the spray time, and the like.

The insulating dot spacer can also be formed by a method such as a screen printing method in which the ink containing the above resin component is printed on the electrode surface through a screen printing plate having a hole having a suitable size.

3 shows another embodiment of the writing pad of the present invention.

The drawing pad 1B is similar to the drawing pad 1A shown in FIG. 1 except that an insulating chained organic polymer compound layer 16 having a functional group capable of bonding with the electrode material is formed on the electrode 11 surface formed on the upper substrate 14. same.

The insulating chained organic polymer compound forming the insulating chained organic polymer compound layer 16 is chemically bonded to the electrode material constituting the electrode 11, whereby the surface of the electrode 11 has a fine beard or mesh-like insulating property. It is apparently covered with a chain organic polymer compound.

The insulating chain organic polymer compound layer 16 may be formed on the surface of the electrode 12 provided on the lower substrate 15. As described above, the surface treatment of forming the insulating chained organic polymer compound layer 16 on at least one of the electrodes 11 and 12 reduces the friction generated between the electrodes 11 and 12 by the insulating chained organic polymer compound. The durability can be improved thereby.

The chain organic polymer compound used for surface treatment of the electrodes 11 and / or 12 has one or more functional groups per molecule capable of bonding with the electrode material in its molecular terminal and / or molecular chain.

Suitable compounds for forming a principal chain of a chain organic polymer compound having a functional group capable of bonding with an electrode material include polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyvinyl acetate, polyvinyl acetal, and polyacrylic acid. Polyacrylic esters such as polymethacrylic acid, polymethyl acrylate, polymethacrylate esters such as polymethyl methacrylate, polyacrylonitrile, polyacrylamide, polytitrafluoroethylene, polyvinylidene fluoride, Polybutadiene, polyisoprene, propylene-ethylene copolymer, ethylene-vinyl acetate copolymer, polycarbonate, polyethylene terephthalate, aromatic polyester, polyethylene oxide and the like.

Transparent drawing pads are widely used as drawing pads, and electrodes made of inorganic compounds are formed on the upper and lower substrates of the transparent drawing pads. In order to treat electrodes composed of inorganic compounds, a chain organic polymer compound having an inorganic reactive group such as a hydroxyl group or an alkoxy group is used as a functional group capable of bonding with the electrode material.

As such an inorganic reactive group, various functional groups of the following general formula are mentioned, for example.

(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 0 to 2 each an integer of 0 to 2, and an integer of csms 1 to 3). And a + b + c = 3).

The polymer is bonded to the inorganic compound constituting the electrode at the -OR ₃ group (hydroxyl or alkoxy group) portion of the general formula (I). Instead of Si, a functional group composed of Ti or Zr can also be used.

Moreover, it is preferable that the number average molecular weights of the chain-shaped organic polymer compound which has a functional group couple | bonded with an electrode material are 1,000-200,000, especially 10,000-100,000. A drawing pad treated with an electrode with a chain organic polymer compound having a number average molecular weight of less than 1,000 cannot sufficiently reduce the friction generated between the electrodes of the drawing pad when an image is input to the drawing pad with an input pen. For this reason, the drawing pad which processed the electrode with the said chain | strand-shaped goji polymer compound cannot fully reduce the damage which arose to two electrodes when it pushes in an input pen and repeats many inputs. Conversely, in a drawing pad in which an electrode is treated with a chain organic polymer compound having a number-average molecular weight of more than 200,000, an input load required when a pen is input to the drawing pad may be too large to allow image input by the input pen.

Among the chain organic polymer compounds having a functional group capable of bonding with the electrode material, the chain organic polymer compound used for surface treatment of the electrode formed of the inorganic compound is a silane coupling agent or a titanium coupling agent. It is synthesized into a compound having both an inorganic reactive group and an organic reactive group in the same molecule and a chain organic compound having a functional group reactive with the organic reactive group.

Here, a silane coupling agent is demonstrated to an example.

a) First, a functional group reactive with an amino group, a vinyl group or an epoxy group and the like of the silane coupling agent is introduced into the molecular terminal and / or molecular chain of the chain organic polymer compound. For example, about the silane coupling agent which has an amino group, this amino group and the carboxyl group which have semicoherence are introduce | transduced in the molecular terminal and / or molecular chain of the said chain organic polymer compound. b) Subsequently, the said chain organic polymer compound in which the said functional group was introduce | transduced is reacted with a silane coupling agent.

When the electrode surface is treated with an insulating chain organic polymer compound having a functional group capable of bonding with the electrode material obtained by the above method, the chain organic polymer compound having a functional group capable of bonding with the electrode material is dissolved in an organic solvent, The coating liquid formed by dispersing is applied to the electrode surface by a coating means such as a bar coater, spinner, roll coater or dipping bath, and then the coating liquid is applied. Heat-dry the electrode attachment substrate.

In the preparation of the coating solution described above, organic solvents having a relatively low boiling point such as ethanol, isopropanol, butanol, acetone, methyl ethyl ketone, ethyl acetate and the like are used. These organic solvents are used individually or in mixture of 2 or more types.

The concentration of the aforementioned chain-like organic polymer compound contained in the coating liquid is preferably 0.1 to 10% by weight.

By changing the concentration of the chain organic polymer compound, the scratch resistance and durability of the two electrodes of the drawing pad and the minimum input load required for inputting an image to the drawing pad can be adjusted.

For example, when the concentration of the aforementioned chain-like organic polymer compound is less than 0.1% by weight, the amount of the insulating organic polymer compound bonded to the electrode surface becomes insufficient, resulting in satisfactory durability of the two electrodes of the drawing pad. Sometimes you can't. Conversely, when the concentration of the above-mentioned chain organic polymer compound exceeds 10% by weight, the amount of the insulating organic polymer compound to be bonded to the electrode surface becomes too large, and as a result, the input load required for inputting an image to the drawing pad becomes large. . Therefore, if the amount of this insulating organic polymer compound is too large, it becomes impossible to input into the drawing pad with the input pen even if the input load is increased.

When heating and drying the electrode attachment substrate to which the coating liquid is applied, it is preferable that the temperature of an electrode surface is 100-150 degreeC.

In addition. As a method of treatment with a chain polymer compound on the surface of the electrode, the following method is also possible.

First, a coating liquid containing a compound having both 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 react the inorganic reactive group of the compound with the electrode material. Subsequently, a coating liquid containing a chain-like high molecular compound having a functional group reactive with an organic reactive group of a compound such as a silane coupling agent is introduced into the terminal or molecular chain of the electrode surface to which the compound is coated as described above. The electrode treated with the insulating chain polymer compound can be obtained by coating and reacting the aforementioned functional group of the chain polymer compound with an organic reactive group of a compound such as a silane coupling agent.

The drawing pad of this invention may process one of the pair of electrode surfaces which comprise a drawing pad with the above-mentioned insulating chain organic polymer compound, and may form an insulating dot spacer in another electrode surface.

Moreover, the drawing pad of this invention may be equipped with the board | substrate with which the electrode in which the said insulating dot spacer was formed may be attached to the electrode surface previously treated with the insulating chain organic polymer compound, and conversely, the insulating dot spacer was formed first. The electrode surface may be provided with the board | substrate with an electrode which processed the said insulating chain-like organic polymer compound.

According to the method for manufacturing a drawing pad according to the present invention, each of the substrates includes a pair of substrates having electrodes formed on one side thereof, and the pair of substrates are arranged in parallel so that the electrodes have a specific height, diameter, and distance between centers. It is possible to obtain a drawing pad having a plurality of insulating dot spacers facing each other with a predetermined interval therebetween, and having dot spacers fixed to at least one surface of both electrode surfaces.

According to the drawing pad of the present invention, the height, diameter, and center-to-center distance of the insulating dot spacer are specified so that the upper substrate does not bend to a meaningful degree, and when a character or a figure is input with an input pen, Even if a finger or another part of the hand touches the upper substrate (input side substrate) of the drawing pad, a mistaken input to the writing pad is prevented.

That is, when the upper substrate of the drawing pad is pressed with an input pen, the distance between adjacent dot spacers is smaller than that of the conventional drawing pad, so that the tip of the input pen is supported by the dot spacer through the input side substrate. Almost no bending occurs. However, in the part pressed by the input pen, a local deformation of the upper substrate including the electric cable occurs. The upper and lower electrodes in the drawing pad are contacted by the deformation locally generated on the upper substrate and the deformation of the dot spacer.

In the drawing pad of the present invention, the height of the dot spacer is low enough to contact the upper and lower electrodes. However, the distance between the adjacent dot spacers is small, so that even if the height of the dot spacer is lowered, the upper and lower substrates can be moved by their own weight. There is no contact with the electrode.

However, the contact area of the upper substrate by the finger when the upper substrate of the drawing pad is pressed by the user's finger or other part of the hand is larger than the contact area of the upper substrate by the input pen when inputting an image. Therefore, when the load on the input pen and the load on the finger (input load by mistake) are the same, the finger has a larger radius of curvature than the input pen, so that the finger on the upper substrate The pressure applied is smaller than the pressure applied to the upper substrate by the input pen. For this reason, input by fingers requires a much larger load than an input pen.

Therefore, in the drawing pad of the present invention, since the load carried by the user's finger accidentally touching the upper substrate at the time of input falls short of the actual input load, the input by mistake can be effectively prevented.

Moreover, according to the drawing pad of this invention, even if an input is repeated several times, a board | substrate does not bend, it is durable, and error operation does not arise.

The drawing paddle of the present invention having excellent characteristics as described above is suitable as an image input device of a handwriting-character-recognizing optical letter reader or a drawing device such as CAD.

If the screen of the writing pad is transparent, that is, the upper and lower electrodes constituting the drawing pad are transparent including its support, and the insulating dot spacers interspersed between the upper and lower electrodes are also transparent. By creating a drawing pad on the screen, the copied image formed on the screen of the drawing pad can be visually confirmed on the screen of the display device through the drawing pad, as in the case of making a normal hard copy by hand. .

Furthermore, by treating at least one of the two electrode surfaces of the drawing pad with an insulative chain organic polymer compound having a functional group capable of bonding with the electrode material, the friction between the two electrodes due to pen input can be minimized. Can improve.

Hereinafter, although this invention is demonstrated based on the following Example, this invention is not limited to these Examples.

Example 1

A mold of indium oxide containing 5% by weight of tin oxide was placed on a 125 μm-thick polyethylene terephthalate (PET) film preheated to 100 ° C. with an electron gun of 2 kW and an oxygen partial pressure of 3 × 10 ⁻⁴ torr and a deposition rate of 3 kV / sec. The vapor deposition was carried out to obtain a PET film F ₀ having a transparent electrode.

Subsequently, a glass substrate G ₀ having a transparent electrode was obtained by repeating the above process except that a glass substrate having a thickness of 1.1 mm was used instead of the PET film and the glass substrate was preheated to 400 ° C.

Methylethylketone 960 containing 40 parts by weight of a polyester resin (Byron, Toyo Textile Co., Ltd.) while heating the glass substrate G ₀ obtained in this way by heating the electrode surface formed on the glass substrate at 60 ° C. A spray solution consisting of parts by weight is sprayed on the electrode surface for 1 minute at a spray flow rate of 30 ml / min and a pressure of 2 kg / cm 2 by a spray method at a distance of 1 m from the electrode surface, and then dried at 120 ° C. to give the electrode glass substrate G ₁ is formed on the insulating dot spacers.

The diameter d of the dot spacer on the electrode surface and the distance L between the centers of the adjacent dot spacers were obtained by taking an electron microscope photograph of the electrode surface on which the dot spacer was formed and averaging the measured values of ten dot spacers. In addition, the height G of the dot spacer was measured with the Tracer-type surface roughness tester.

The results are shown in Table 1.

Subsequently, an electrode attached to the glass substrate to the electrode surface, the dot spacers formed of the G _1, the electrode surface of the electrode attached to the PET film F ₀ electrode attached to the PET film F _0, put in contact with the dot spacers, electrodes attached to the PET film F ₀ A drawing pad was obtained in which the electrode was the upper electrode (input side), and the electrode of the glass substrate G _{1 with} the electrode was the lower electrode.

The following characteristics were evaluated about the obtained drawing pad.

(1) required input load

The PET film occupying the upper electrode is a polyacetal resin indenter having a radius of curvature R of 1 mm and 2 mm, respectively, and is applied by pressing the PET film vertically and gradually increasing the vertical load. While measuring the resistance between the upper and lower electrodes, the load value when the resistance became 2 kΩ or less was obtained, and the load value was evaluated as the load value required for inputting the writing pad into the writing pad.

(2) Input load by mistake

The PET film supporting the upper electrode is a silicone resin presser with a curvature radius (R) of 10 mm and a hardness of 60. The PET film is pressed vertically by applying a load to the PET film and gradually increasing the vertical load. Measure the resistance between the two electrodes, calculate the load value when this resistance is 2 kΩ or less, and use this as a load value that caused noise on the input by mistake when inputting it with the input pen while touching the screen of the drawing pad. Evaluated.

(3) durability

The PET film supporting the upper electrode was reciprocated on the PET film with this ball pen while pressing with a commercially available ballpoint pen, and the number of round trips until the linearity of the image was poor was evaluated as durability. .

The results are shown in Table 1.

Example 2

By the same procedure as in Example 1, except that a spray liquid consisting of 960 parts by weight of methyl ethyl ketone containing 100 parts by weight of polyester resin (Bylon Toyo Co., Ltd.) was used and the spraying time was 50 seconds. An electrode glass substrate G ₂ having an insulating dot spacer formed thereon was prepared.

For the glass substrate with electrodes thus obtained, the height G of the dot spacers, the diameter d of the dot spacers on the electrode surface, and the distance L between the centers of the adjacent dot spacers were measured in the same manner as in Example 1. It was.

The results are shown in Table 1.

Subsequently, a drawing pad was manufactured in the same manner as in Example 1 except for using an electrode-attached glass substrate G ₂ having an insulating dot spacer formed thereon, and the same characteristics as in Example 1 were evaluated for the obtained drawing pad. .

The results are shown in Table 1.

Example 3

30 parts by weight of acrylic resin (Acrydick A-433 manufactured by Dainippon Ink, Inc.) and melamine, while maintaining the temperature of the electrode surface formed on the glass substrate by heating the glass substrate G ₀ with electrode obtained in Example 1 A spray liquid consisting of 960 parts by weight of methyl ethyl ketone containing 20 parts by weight of resin (Dinihon Ink Co., Ltd. Superbecamin L-105) was spaced at an interval of 1 m from the electrode surface. , Sprayed on the electrode surface for 1.5 minutes at a pressure of 2kg / cm 2, and dried at 150 ℃ to prepare a glass substrate with an electrode G ₃ with a semi-spherical insulating dot spacer.

For the glass substrate with electrodes thus obtained, the height G of the dot spacers, the diameter d of the dot spacers on the electrode surface, and the distance L between the centers of the adjacent dot spacers were measured in the same manner as in Example 1. It was.

The results are shown in Table 1.

Subsequently, a drawing pad was manufactured in the same manner as in Example 1 except that the glass substrate G ₃ with an electrode having an insulating dot spacer was formed on the electrode surface yarns, and the same characteristics as those in Example 1 were evaluated. .

The results are shown in Table 1.

Example 4

The atomization pressure 3kg / ㎝2 except that the and is carried out in the same manner as in Example 3 to prepare an electrode attached to the dot spacers formed on the electrode surface of glass substrate G _4, and at the height (G), the electrode surface of the dot spacers obtained The diameter d of the dot spacer and the distance L between the centers of the adjacent dot spacers were measured in the same manner as in Example 1.

The results are shown in Table 1.

Subsequently, a drawing pad was manufactured in the same manner as in Example 1 except for using an electrode-attached glass substrate G ₄ having an insulating dot spacer formed thereon, and the same characteristics as in Example 1 were evaluated for the obtained drawing pad. .

The results are shown in Table 1.

Example 5

Except that the spraying flow rate 30㎖ / min in Example 3 in the same manner as in the manufacture of the electrode glass substrate G ₅ the dot spacers formed on the electrode surface, at the height (G), the electrode surface of the dot spacers obtained The diameter d of the dot spacer and the distance L between the centers of the adjacent dot spacers were measured in the same manner as in Example 1.

The results are shown in Table 1.

Subsequently, a drawing pad was manufactured in the same manner as in Example 1 except for using an electrode-attached glass substrate G ₅ having an insulating dot spacer formed thereon, and the same characteristics as in Example 1 were evaluated for the obtained drawing pad. It was.

The results are shown in Table 1.

Example 6

And Example 3 In the same manner as in the manufacture of the electrode glass substrate G _6, the dot spacers formed on the electrode surface, and the dots in the height (G), the electrode surface of the dot spacers obtained, except that the spraying time of 1 minute The diameter d of the spacer and the distance L between the centers of adjacent dot spacers were measured in the same manner as in Example 1.

The results are shown in Table 1.

Subsequently, a drawing pad was manufactured in the same manner as in Example 1 except that the glass substrate G ₆ with an electrode having an insulating dot spacer formed thereon was used. The same characteristics as those in Example 1 were evaluated for the resulting drawing pad. .

The results are shown in Table 1.

Example 7

An electrode glass with dot spacers formed on the electrode surface in the same manner as in Example 2 except that the glass substrate G ₀ with electrode was heated to spray the spray liquid while maintaining the temperature of the electrode surface formed on the glass substrate at 80 ° C. preparing a substrate G _7, which was measured by the same method as the height (G), the diameter of the dot spacers on the electrode surface (d) and the center-to-center distance of the adjacent dot spacers (L) of the dot spacers obtained as in example 1.

The results are shown in Table 1.

Subsequently, a drawing pad was manufactured in the same manner as in Example 1 except that the glass substrate G ₇ with an electrode having an insulating dot spacer formed thereon was used. The same characteristics as those in Example 1 were evaluated for the resulting drawing pad. .

The results are shown in Table 1.

Example 8

Spherical silica particles (Sukkubai Chemical Co., Ltd., Jinsa-gu, SW, average particle diameter 2μm) while heating the glass substrate G ₀ with the electrode obtained in Example 1 while maintaining the temperature of the electrode surface formed on the glass substrate at 60 ° C. ) A spray liquid consisting of 960 parts by weight of methyl ethyl ketone containing 3 parts by weight and 40 parts by weight of a polyester resin (Bylon, Toyo Textile Co., Ltd.) at an interval of 1 m from the electrode surface. ㎖ / min, pressure 2kg / ㎝2 to the electrode surface after spraying for one minute, the insulating dot spacers on the hemisphere formed by drying a 120 ℃, with the silica particles coated with a polyester resin formed in the electrode glass substrate G ₈ Was prepared.

For the glass substrate with electrodes thus obtained, the height G of the dot spacers, the diameter d of the dot spacers on the electrode surface, and the distance L between the centers of the adjacent dot spacers were measured in the same manner as in Example 1. It was.

The results are shown in Table 1.

Subsequently, a drawing pad was manufactured in the same manner as in Example 1 except that the glass substrate G ₈ with an electrode having insulating dot spacers formed thereon was used, and the same characteristics as in Example 1 were evaluated for the obtained drawing pad. .

The results are shown in Table 1.

Example 9

Spherical divinylbenzene resin particles (Suksei Chemical Co., Ltd. product, Micropearl SP) while heating the glass substrate G ₀ with the electrode obtained in Example 1 while maintaining the temperature of the electrode surface formed on the glass substrate at 80 ° C. A spray liquid consisting of 960 parts by weight of methyl ethyl ketone containing 3 parts by weight of an average particle diameter of 4.25 μm) and 30 parts by weight of an acrylic resin (Acrydick A-405, manufactured by Dinihon Ink Co., Ltd.) at an interval of 1 m from the electrode surface, Hemispherical insulating dots made of a resin particle coated with acrylic resin and melamine resin after spraying for 1 minute on the electrode surface by spraying method for 30 minutes / min, spray pressure 3kg / cm2 by spray method An electrode glass substrate G ₉ having a spacer was prepared.

For the glass substrate with electrodes thus obtained, the height G of the dot spacers, the diameter d of the dot spacers on the electrode surface, and the distance L between the centers of the adjacent dot spacers were measured in the same manner as in Example 1. It was.

The results are shown in Table 1.

Subsequently, a drawing pad was manufactured in the same manner as in Example 1 except that the glass substrate G ₉ with an insulating dot spacer formed on the electrode surface was used, and the same characteristics as in Example 1 were evaluated for the obtained drawing pad. .

The results are shown in Table 1.

Example 10

Two types of spherical silica particles having a particle diameter of 1 μm and 5 μm were heated while maintaining the temperature of the electrode surface formed on the glass substrate by heating the glass substrate G ₁₀ with electrode obtained in Example 1 (Showkubai Chemical Co., Ltd.) 1m of a spray solution consisting of 960 parts by weight of methyl ethyl ketone containing 1 part by weight, 5 parts by weight of the product, and Jinsa-gu) and 50 parts by weight of polyester resin (Bylon, Toyo Textile Co., Ltd.) At intervals of 30 m / min, sprayed at an electrode surface at a spray flow rate of 30 ml / min and a pressure of 2 kg / cm < 2 > for 1 minute, and then dried at 120 deg. An electrode glass substrate G ₁₀ having two different hemispherical insulating dot spacers was prepared.

For the glass substrate with electrodes thus obtained, the heights G ₁ and G ₂ of the two types of dot spacers, the diameters of the dot spacers d ₁ and d ₂ on the electrode surface, and the center of the adjacent dot spacers The distance L was measured in the same manner as in Example 1.

The results are shown in Table 1.

Subsequently, a drawing pad was manufactured in the same manner as in Example 1 except that the glass substrate G ₁₀ with an electrode having an insulating dot spacer formed thereon was used. The same characteristics as those in Example 1 were evaluated for the resulting drawing pad. .

The results are shown in Table 1.

Example 11

30 parts by weight of acrylic resin (Acrydick A-433 manufactured by Dainippon Inc.) and melamine, while maintaining the temperature of the electrode surface formed on the glass substrate by heating the glass wave G ₁₀ with the electrode obtained in Example 1 A spray liquid consisting of 960 parts by weight of methyl ethyl ketone containing 20 parts by weight of resin (Dinihon Ink Co., Ltd. Superbecamine L-105) was spaced 1 m from the electrode surface, and the spray flow rate was 10 ml / min. After spraying for 1 minute on the electrode surface at a pressure of 3 kg / cm ² , the same spray liquid was again spaced 1 m from the electrode surface, and sprayed at a spray flow rate of 25 ml / min and pressure of 2 kg / cm 2 by the spray method. After spraying on the surface for 30 seconds and dried at 150 ° C, an electrode glass substrate G ₁₁ having two kinds of hemispherical insulating dot spacers having different heights was formed.

For the glass substrate with electrodes thus obtained, the heights G ₁ and G ₂ of the two types of dot spacers, the diameters of the dot spacers d ₁ and d ₂ at the electrode surface, and the center of the adjacent dot spacers The distance L was measured in the same manner as in Example 1.

The results are shown in Table 1.

Subsequently, a drawing pad was manufactured in the same manner as in Example 1 except for using an electrode-attached glass substrate G ₁₁ having an insulating dot spacer formed thereon, and the same characteristics as in Example 1 were evaluated for the obtained drawing pad. .

The results are shown in Table 1.

Comparative Example 1

In Example 1 by heating the electrode glass substrate G ₀ obtained in keeping the temperature of the electrode surface formed on a glass substrate by 120 ℃, in the same manner as in Example 2 except that a spray for 8 seconds to spray the liquid on the rear surface electrode The glass substrate Ga with an electrode in which the dot spacer was formed on the electrode surface was produced.

For the glass substrate with electrodes thus obtained, the height G of the dot spacers, the diameter d of the dot spacers on the electrode surface, and the distance L between the centers of the adjacent dot spacers were measured in the same manner as in Example 1. It was.

The results are shown in Table 1.

Subsequently, a drawing pad was manufactured in the same manner as in Example 1 except that the glass substrate Ga with an insulating dot spacer formed on the electrode surface was used, and the same characteristics as in Example 1 were evaluated for the obtained drawing pad.

The results are shown in Table 1.

Comparative Example 2

The glass substrate with electrodes obtained by insulating paste (1000Medium Co., Ltd. product, 1000Medium) in Example 1. After printing using a screen printing plate having a hole having a diameter of 150 μm and a pitch of 5 mm on G ₀ , it was dried at 120 ° C. to prepare an electrode glass substrate Gb having a dot spacer on the electrode surface.

For the glass substrate with electrodes thus obtained, the height G of the dot spacers, the diameter d of the dot spacers on the electrode surface, and the distance L between the centers of the adjacent dot spacers were measured in the same manner as in Example 1. It was.

The results are shown in Table 1.

Subsequently, a drawing pad was manufactured in the same manner as in Example 1 except that the glass substrate Gb with an electrode having insulating dot spacers formed on the electrode surface was used, and the same characteristics as in Example 1 were evaluated for the obtained drawing pad.

The results are shown in Table 1.

As is apparent from Table 1, any of the input loads of the writing pads of Examples 1 to 11 was evaluated to be 1 kg or more. On the other hand, in the drawing pads of Comparative Examples 1 and 2, any input load due to a real number is evaluated to be less than 100 g. Therefore, when the drawing pad according to the present invention is used in the image input apparatus, malfunctions input by mistake into the image input apparatus hardly occur.

Moreover, any of the durability expressed by the input repetition frequency of the writing pad of Examples 1-11 is highly evaluated in 30,000 times or more. On the contrary, the durability expressed by the input repetition frequency of the writing pads of Comparative Examples 1 and 2 is evaluated as low as 500 or less. Therefore, the drawing pad according to the present invention has excellent durability against input repetition.

Example 12

[Synthesis of Chain Polymer Compound A]

Four spout flasks with a number average molecular weight of 5.0 × 10 20 g of phosphorous polyoxyethylene methyl (PEO) and 8 g of succinic anhydride were added. Subsequently, after degassing the four spout flasks, nitrogen gas was put into the flask to make the atmosphere inside the flask into a nitrogen gas atmosphere.

Then, 120 g of 1,2-dichloroethane as a solvent and 1 g of pyridine as a catalyst were added to the flask. These mixtures were stirred well at 80 ° C. for 72 hours, and the resulting reaction mixture was filtered through a suction filter to extract the filtrate. 1,2-dichloroethane and pyridine were removed from the filtered liquid 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 resulting aqueous solution, and the solution was separated into an aqueous phase and an organic phase.

After adding chloroform to the obtained aqueous phase, the mixture was separated into an aqueous phase and a chloroform phase, and the reaction product contained in the aqueous phase was extracted with chloroform. The reaction product obtained by evaporating and removing chloroform on chloroform was dissolved in benzene. Subsequently, the solution obtained by adding diethyl ether to the benzene solution of the reaction product was ice-cooled to obtain a white precipitate of the purification reaction product. This white precipitate was suction filtered, and then purified polyoxyethylene methyl succinate having a carboxyl group was dried under reduced pressure.

A mixture of 10 g of polyoxyethylene methyl succinate obtained in this way, 400 g of chloroform as a solvent and 1.06 g of dicyclohexylcarbodiimide as a catalyst was put into a round bottom flask, cooled with ice, and the mixture was stirred for 2 hours. 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. Chloroform was evaporated and removed from the reaction mixture thus obtained, and benzene was added to the reaction product to obtain a benzene solution of the reaction product. The solution obtained by adding diethyl ether to this benzene solution was ice-cooled to obtain white precipitate of the purification reaction product.

This white precipitate was dissolved in ethyl acetate, and the insoluble precipitate in the ethyl acetate solution was removed by suction filtration. Ethyl acetate in the obtained filtrate was evaporated and removed by an evaporator, and the solid obtained was dried under reduced pressure to obtain a chain polymer compound A having POE as the main chain.

[Production and Evaluation of Drawing Pad]

The above-mentioned 50 g of the chain polymer compound A was gradually added to 950 g of tetrahydrofuran while stirring at room temperature to obtain a dispersion of the chain polymer compound A.

After dipping the PET film F with electrode obtained in Example 1 to this dispersion liquid, the PET film with electrode was taken out at a speed of 2 mm / sec from the dispersion, and then heated and dried at 120 ° C. for 30 minutes, so that the electrode surface was a chain-like polymer compound. PET film F with an electrode treated with A was obtained.

A metal ball having a diameter of 10 mm was obtained on the electrode surface of the PET film F with electrodes obtained in this way, and the coefficient of friction and scratch resistance when 20g, 40g, 60, and 80g of vertical load were applied to the gold balls respectively. It measured with the surface property testing machine (HAIDON-14 by Shinto Chemical Co., Ltd.). Scratching resistance After the metal ball was pushed on the electrode surface by one point while applying the above-mentioned load, it was observed under the microscope whether the electrode surface was damaged or not, and if the electrode surface was not damaged, the scratch resistance was evaluated as good.

The results were shown in Table 2.

Subsequently, the above-mentioned insulating dot spacers of the glass substrate G with electrodes described above were brought into contact with each other so that the chain-like polymer compound A on the electrode surface of the PET film F with electrodes and the insulating dot spacers formed on the electrode surfaces of the glass substrate G with electrodes obtained in Example 1 were in contact with each other. On the electrode surface on which the electrode was formed, the above-described PET film F with electrodes was placed, and a drawing pad was obtained in which the electrode of PET film F with electrodes was an upper electrode (input side) and the electrode of glass substrate G with electrode was a lower electrode.

About the obtained drawing pad, necessary input load, real input load, and durability were evaluated by the same method as Example 1.

The results were shown in Table 3.

Example 13

[Synthesis of Chain Polymer Compound B]

After the three spout flasks were degassed, nitrogen gas was put into the flask to make the atmosphere inside the plastic into a nitrogen gas atmosphere.

Then, inside the flask, 20 g of styrene purified by distillation under reduced pressure, 0.4 g of 3-mercaptopyrrolopionic acid, 0.82 of 2,2'-azobisisobutyronitrile and 40 g of anhydrous tetrahydrofuran were added as a solvent. After the mixture was stirred at 70 ° C. for 6 hours to react, 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, methanol was added to the obtained benzene solution, and the solution was ice-cooled to obtain a precipitate of the reaction product. This white precipitate was filtered off with suction, and then 16.3 g of a polystyrene (PSt) purified product having a carboxyl group at the molecular end was dried under reduced pressure.

The number average molecular weight of the obtained PSt was 1.2 × 10 by gel permeation chromatography (GPC). Was measured.

A mixture of 5.75 g of PSt thus obtained, 100 g of chloroform as a solvent and 0.1 g of dicyclohexylcarbodiimide as a catalyst was placed in a round bottom flask, cooled with ice, and the mixture was stirred for 2 hours. After stirring, 0.13 g of aminopropyltriethoxysilane was added to the mixture, and the mixture was allowed to react at 5 ° C for 24 hours. Chloroform was evaporated and removed from the reaction mixture thus obtained, and benzene was added to the reaction product to obtain a benzene solution of the reaction product. Methanol was added to this benzene solution, and the solution obtained by ice cooling was obtained white precipitate of the purification reaction product.

This white precipitate was dissolved in ethyl acetate, and the insoluble precipitate in the ethyl acetate solution was removed by suction filtration. The solid obtained by evaporating and removing ethyl acetate in the obtained filtrate by evaporation was dried under reduced pressure, and the chain polymer compound B which has PSt as a principal chain was obtained.

[Production and Evaluation of Drawing Pad]

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

After dipping the PET film F with electrode obtained in Example 1 to this dispersion liquid, the PET film with electrode was taken out at a speed of 1 mm / sec from the dispersion, and then heated and dried at 120 ° C. for 30 minutes, whereby the electrode surface was a chain-like polymer compound. PET film F with an electrode treated with B was obtained.

The measurement of the friction coefficient of the electrode surface of this PET film with electrodes F and the evaluation of scratch resistance were performed in the same manner as in Example 12.

The results were shown in Table 2.

Subsequently, a dummy pad was manufactured in the same manner as in Example 1, except that the electrode-attached PET film F and the electrode-attached glass substrate G obtained in Example 3 were used. About the obtained drawing pad, necessary input load, real input load, and durability were evaluated by the same method as Example 1.

The results were shown in Table 3.

Example 14

[Synthesis of Chain-shaped Polymer Compound C]

After the three spout flasks were degassed, nitrogen gas was put into the flask to make the atmosphere inside the plastic into a nitrogen gas atmosphere.

Then, inside the flask, 5 g of methyl methacrylate purified by distillation under reduced pressure, 0.14 g of 3-mercaptopylopionic acid, 0.07 g of 2,2'-azobisisobutyronitrile and 10 g of anhydrous tetrahydrofuran as a solvent Was added. The mixture was stirred at 60 ° C. for 3 hours to react, and then the solvent was evaporated and removed from the reaction mixture to obtain a white powdery reaction product. This white powder was dissolved in benzene, hexane was added to the obtained benzene solution, and the solution was ice-cooled to obtain a precipitate of the reaction product. This white precipitate was suction filtered and then 3.3 g of a polymethyl methacrylate (PMMA) purified product having a carboxyl group at the molecular end was dried under reduced pressure.

The number average molecular weight of the obtained PMMA was 8.5x10 by GPC method. Was measured.

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 was put into a round bottom flask and cooled with ice, and the mixture was stirred for 2 hours. After stirring, 0.13 g of aminopropyltriethoxysilane was added to the mixture, and the mixture was allowed to react at 5 ° C for 24 hours. Chloroform was evaporated and removed from the reaction mixture thus obtained, and benzene was added to the reaction product to obtain a benzene solution of the reaction product. The solution obtained by adding hexane to this benzene solution was ice-cooled to obtain white precipitate of the purification reaction product.

This white precipitate was dissolved in ethyl acetate, and the insoluble precipitate in the ethyl acetate solution was removed by suction filtration. Ethyl acetate in the obtained filtrate was evaporated and removed by an evaporator, and the solid obtained was dried under reduced pressure to obtain a chain polymer compound C having PMMA as the main chain.

[Production and Evaluation of Drawing Pad]

20 g of the above-mentioned high molecular compound C was gradually added to 980 g of tetrahydrofuran while stirring at room temperature to obtain a dispersion of the high molecular compound C of the chain.

After dipping the PET film F with electrode obtained in Example 1 to this dispersion liquid, the PET film with electrode was taken out at a speed of 2 mm / sec from the dispersion, and then heated and dried at 120 ° C. for 30 minutes, so that the electrode surface was a chain-like polymer compound. PET film F with an electrode treated with C was obtained.

The measurement of the friction coefficient of the electrode surface of this PET film with electrodes F and the evaluation of scratch resistance were performed in the same manner as in Example 12.

The results were shown in Table 2.

Subsequently, a dummy pad was manufactured in the same manner as in Example 1, except that the electrode-attached PET film F and the electrode-attached glass substrate G obtained in Example 8 were used. Real input load and durability were evaluated by the same method as in Example 1.

The results were shown in Table 3.

Example 15

[Synthesis of Chain Polymer D]

After the three spout flasks were degassed, nitrogen gas was put into the flask to make the atmosphere inside the plastic into a nitrogen gas atmosphere.

Then, 15 g of vinyl acetate purified by distillation under reduced pressure, 0.15 g of 4,4'-azobis (4-cyanoisovaleric acid) and 5 g of methanol were added into the flask. After the mixture was stirred at 60 DEG C for 4 hours to react, the solvent was evaporated and removed from the 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 solution was ice-cooled to obtain a precipitate of the reaction product. This white precipitate was filtered off with suction, and then 12.1 g of a polyvinyl acetate (PVAc) purified product having a carboxyl group at the molecular end was dried under reduced pressure.

The number average molecular weight of the obtained PVAc was 1.3 × 10 by GPC method. Was measured.

Thus obtained mixture of 6 g of PVAc, chloroform and 100 g of a solvent was put into a round bottom flask, cooled with ice, and 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. Chloroform was evaporated and removed from the reaction mixture thus obtained, and then dioxane was added to the reaction product to obtain a dioxane solution of the reaction product. The solution obtained by adding diethyl ether to this dioxane solution was ice-cooled to obtain white precipitate of the purification reaction product.

This white precipitate was dissolved in ethyl acetate, and the insoluble precipitate in the ethyl acetate solution was removed by suction filtration. The solid obtained by evaporating and removing ethyl acetate in the obtained filtrate by evaporator was dried under reduced pressure, and the chain polymer compound D which has PVAc as a principal chain was obtained.

[Production and Evaluation of Drawing Pad]

3 g of the aforementioned chain polymer compound D was gradually added to 997 g of tetrahydrofuran while stirring at room temperature to obtain a dispersion of the chain polymer compound D.

After dipping the PET film F with electrode obtained in Example 1 to this dispersion liquid, the PET film with electrode was taken out at a speed of 2 mm / sec from the dispersion, and then heated and dried at 120 ° C. for 30 minutes, so that the electrode surface was a chain-like polymer compound. PET film F with an electrode treated with D was obtained.

The measurement of the friction coefficient of the electrode surface of this PET film with electrodes F and the evaluation of scratch resistance were performed in the same manner as in Example 12.

The results were shown in Table 2.

Subsequently, a dummy pad was manufactured in the same manner as in Example 1 except that the electrode-attached PET film F and the electrode-attached glass substrate G obtained in Example 9 were used. Real input load and durability were evaluated by the same method as in Example 1.

The results were shown in Table 3.

Example 16

Except for using the electrode-attached glass substrate G obtained in Example 3 instead of the PET film F with electrode, the electrode surface having the insulating dot spacer formed on the electrode surface and having the insulating dot spacer formed on the electrode surface in the same manner as in Example 1. The glass substrate G with an electrode processed by this chain-like high molecular compound A was obtained.

The measurement of the friction coefficient of the electrode surface of the glass substrate G with electrodes and the evaluation of the durability pattern were performed in the same manner as in Example 12.

The results were shown in Table 2.

Subsequently, a dummy pad was manufactured in the same manner as in Example 1, except that the electrode-attached glass substrate G and the electrode-attached PET film F obtained in Example 1 were used. Real input load and durability were evaluated by the same method as in Example 1.

The results were shown in Table 3.

Example 17

On the electrode surface treated with the chain polymer compound B of the electrode-attached PET film F obtained in Example 13, an insulating dot spacer was formed in the same manner as in Example 8 to obtain an electrode-attached PET film F.

The measurement of the friction coefficient of the electrode surface of this PET film F and the evaluation of scratch resistance were performed in the same manner as in Example 12.

The results were shown in Table 2.

Subsequently, a dummy pad was manufactured in the same manner as in Example 1 except that the electrode-attached PET film F and the electrode-attached glass substrate G obtained in Example 1 were used. Real input load and durability were evaluated by the same method as in Example 1.

The results were shown in Table 3.

Comparative Example 3

The measurement of the friction coefficient of the electrode surface of the electrode film PET film F obtained in Example 1 and the evaluation of scratch resistance were performed in the same manner as in Example 12.

The results were shown in Table 2.

Claims (8)

A pair of substrates having electrodes formed on each surface thereof, the pair of substrates being spaced apart at a predetermined distance through a plurality of insulating dot spacers so that the pair of substrates face each other in parallel, and the dot spacers are disposed at least on both electrode surfaces. A drawing pad fixed to one side, wherein the height of the dot spacer is G, and the diameter of the dot spacer on the electrode surface on which the dot spacer is fixed is d, dG, and G is 15 µm. Or less, and an average distance L between the centers of adjacent dot spacers is 3dL100d and 100 µm or less. The writing pad according to claim 1, wherein the insulating dot spacer is made of a mixture of two kinds of insulating dot spacers having different heights G ₁ and G ₂ (G ₁ G ₂ ). The average distance L between the centers of the dot spacers satisfies the following expression when the tip portion of the input pen for pressing one of the substrates has a radius of curvature R (μm). Drawing pad. L≤R / n (Where n is an integer of 4 or more) The writing pad according to claim 1, wherein the drawing pad is treated with an insulating chain organic polymer compound which is at least one of the pair of electrode surfaces and has a functional group capable of bonding with an electrode material. The functional group according to claim 4, wherein the functional group which can be combined with the electrode material is represented by the following general formula [1], (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, c is an integer of 1 to 3, a + b + c = 3) Drawing pad, characterized in that the number average molecular weight of the organic polymer compound is 1,000 to 200,000. A pair of substrates having electrodes formed on each surface thereof, the pair of substrates being spaced apart at a predetermined distance through a plurality of insulating dot spacers so that the pair of substrates face each other in parallel, and the dot spacers are disposed at least on both electrode surfaces. As a method for producing a drawing pad fixed to one side, a spacer forming solution formed by dissolving and dispersing a non-conductive resin in an organic solvent is formed in a droplet form on a preheated electrode surface, and then the organic solvent is evaporated from the droplet. Forming an insulating dot spacer on the electrode surface having a height G of 15 μm or less, which is smaller than the diameter d on the electrode surface (Gd), and an average distance L between adjacent centers of the dot spaces is 100 μm or less, and 3dL100d. Method for producing a writing pad, characterized in that it comprises a. The coating liquid formed by dissolving an insulating chain organic polymer compound having a functional group capable of bonding with an electrode material in an organic solvent in a solvent and dispersed therein is applied to at least one of the pair of electrode surfaces. And drying the coated electrode surface, and treating the electrode surface with an insulating chain-like organic polymer compound. The functional group according to claim 6, wherein a coating liquid containing a compound having both an inorganic reactive group and an organic reactive group in the same molecule is applied to at least one of the pair of electrode surfaces described above, and then the functional group reactive with the organic reactive group. After applying the coating liquid containing the chain-shaped organic polymer compound having the above to the electrode surface to which the first coating liquid was applied, the coated electrode surface was dried, and the electrode surface was treated with an insulating chain organic polymer compound. Method for producing a writing pad, characterized in that it comprises a step of.