JPH08216327A - Transparent conductive laminate and transparent tablet - Google Patents

Abstract

PURPOSE: To prevent an interference fringe to obtain a superior visibility by a method wherein in a transparent conductive laminate formed by providing a transparent conductive film on each substrate made of a transparent organic high molecular molded piece, one substrate surface with the transparent conductive film formed is roughened to have a specific range of center line average height. CONSTITUTION: In a transparent tablet, upper and lower electrode substrates formed by providing transparent conductive films 2, 6 on substrates each made of a transparent organic high molecular molded piece are placed with the transparent conductive films 2, 6 opposed to each other. On one of the substrates, a roughened layer 7 is formed. The lower electrode substrate is formed by providing the transparent conductive film 2 and a dot spacer 3 on the substrate 1 made of a transparent organic high molecular molded piece. The upper electrode substrate is composed of a hard coat layer 5 on one surface of the substrate 4 of a transparent organic high molecular molded piece, the roughened layer 7 on the other surface thereof, and the transparent conductive film 6. The roughened layer 7 is roughened to have a center line average height of 0.05-0.40μm by adjusting a mixing ratio of a thermosetting or ultraviolet curing resin and fine silica particles forming the roughened layer 7.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a transparent conductive laminate and a transparent tablet obtained by using the transparent conductive laminate.

[0002]

2. Description of the Related Art Recently, microcomputers have come to be used in various devices, and the devices have a tablet (also called a touch switch, a touch panel, a flat switch) that is an information input unit and a display that is an output unit. Is installed. As the tablet, there is a transparent tablet that can be mounted on the display in addition to the conventional type that is placed on a desk. The transparent tablet allows you to input by pressing the tablet surface with your finger or pen while looking at the display screen of the display, so the input operation is easy, and because the display and tablet can be integrated, it saves space. Is increasing.

In a transparent tablet, two transparent electrode substrates having a transparent conductive film provided on at least one surface are arranged so that the transparent conductive films face each other, and only in a portion where an external force is applied to the transparent electrode substrate. The transparent conductive films come into contact with each other to operate as a switch. For example, selection of a menu on the display screen or input of a figure or handwritten character can be performed.

FIG. 3 shows a configuration example of a conventional transparent tablet. The transparent tablet is a lower electrode substrate having a transparent conductive film 2 and dot spacers 3 provided on the upper surface of a glass substrate 1, and an upper electrode having a hard coat layer 5 on the upper surface of a polyester film 4 and a transparent conductive film 6 on the lower surface. Board,
The transparent conductive films are arranged so as to face each other, and two electrode substrates are bonded together at the periphery. In addition,
This figure is a part of the configuration, and the surrounding insulating layer, adhesive layer, and external drawing circuit are omitted.

[0005]

There are portable information terminals in the main fields of use of transparent tablets, but a reflective LCD is used for the portable information terminals in terms of power consumption.
A transparent tablet mounted on a CD is required to have good visibility. However, in the conventional transparent tablet, there is a problem that the upper electrode substrate is loosened due to environmental changes, and as a result, interference fringes are generated between both electrode substrates to deteriorate the visibility.

It is an object of the present invention to solve the above problems and obtain a transparent conductive laminate which is capable of preventing interference fringes and has excellent visibility, and further a transparent tablet.

[0007]

The transparent conductive laminate of the present invention is a transparent conductive laminate formed by forming a transparent conductive film on a substrate made of a transparent organic polymer molded article. It is characterized in that at least one of the substrate surfaces on the side where the is formed has a center surface average roughness (SRa) in the range of 0.05 to 0.40 μm.

The transparent tablet of the present invention is a transparent tablet in which two transparent electrode substrates each having a transparent conductive film provided on at least one surface are arranged so that their transparent conductive films face each other. The transparent conductive laminate of the present invention is used as an electrode substrate.

That is, the three-dimensional surface roughness affects the interference fringe prevention effect. Then, by using an organic polymer molded product substrate having a controlled central surface average roughness (SRa) of the roughened surface and a transparent conductive film provided on the upper or lower electrode substrate, interference fringes are generated. A transparent tablet that can be prevented and has excellent visibility is obtained.

Here, the center surface average roughness (SRa) is
The center line average roughness (Ra) of JIS B 0601 is 3
It is an extension of dimension and is defined as follows. First, a portion having an area Sm is extracted from the roughness curved surface on the center surface thereof. Then, the X axis and the Y axis are placed as the orthogonal coordinate axes on the center plane of the extracted portion. Further, the axis orthogonal to the center plane is the Z axis, and the roughness curved surface is represented by z = f (x, y). Then, at this time, the value SRa (μ
m) is called the center plane average roughness. However, Lx · Ly = S
m.

[0011]

[Equation 1]

The organic polymer compound constituting the transparent organic polymer molded article used in the present invention is not particularly limited as long as it is a transparent organic polymer excellent in heat resistance. Examples thereof include polyester resins such as polyethylene terephthalate, polyethylene-2,6-naphthalate and polydiallyl phthalate, polycarbonate resins, polyether sulfone resins, polysulfone resins, polyarylate resins, acrylic resins and cellulose triacetate resins. Of course, they may be used as homopolymers, copolymers or alone or as a blend.

The shape of such an organic polymer molded product is not particularly limited, but a sheet or a film is usually preferable. Further, it may have a structure in which two or more films and / or sheets are laminated. When used as an upper electrode substrate of a transparent tablet, the substrate has a thickness of 75 to 400 μm in terms of strength for maintaining flexibility and flatness for operating the transparent tablet as a switch.
The film-like one is preferable. When used as a lower electrode substrate, a sheet-like material having a thickness of 0.4 to 2 mm is preferable in terms of strength for maintaining flatness, but a thickness of 7
A film-shaped material having a thickness of 5 to 400 μm may be attached to another sheet so that the total thickness is 0.4 to 2 mm.

When the transparent conductive laminate of the present invention is used as the upper electrode substrate of a transparent tablet, the organic polymer molded product substrate, the glass substrate, or the transparent conductive film on the laminate substrate is used as the lower electrode substrate. You may use what formed the film. From the viewpoint of strength and weight of the transparent tablet, the thickness of the substrate composed of a single layer or a laminate is preferably 0.4 to 2 mm.

When the transparent conductive laminate of the present invention is used as the upper electrode substrate, it is preferable to provide a hard coat layer on the surface of the transparent tablet to which external force is applied.
As the material for forming the hard coat layer, methyltriethoxysilane, melamine-based thermosetting resin such as organosilane-based thermosetting resin such as phenyltriethoxysilane and etherified methylolmelamine, polyol acrylate, polyester acrylate, There are polyfunctional acrylate UV-curable resins such as urethane acrylate and epoxy acrylate, and the like, and a mixture of silica fine particles can be used if necessary. The thickness of the hard coat layer is preferably 2 to 5 μm from the viewpoint of flexibility and abrasion resistance.

As a method for forming the roughened layer of the present invention, there are a physical method such as a sandblast method, a chemical method such as an etching method, and a method of applying a resin in which fine particles such as silica are dispersed. Above all, the coating method is preferable in that the surface roughness can be easily controlled.

Resins used in the coating method include organosilane thermosetting resins such as methyltriethoxysilane and phenyltriethoxysilane, melamine thermosetting resins such as etherified methylolmelamine, polyol acrylates and polyester acrylates. Examples include polyfunctional acrylate-based UV curable resins such as urethane acrylate and epoxy acrylate.

The surface roughness is determined by the center surface average roughness (SR) depending on the mixing ratio of the resin and fine particles such as silica and the coating film thickness.
It can be controlled so that a) falls within the range of 0.05 to 0.40 μm. If the center plane average roughness is less than 0.05 μm, a sufficient effect of preventing interference fringes cannot be obtained. Also, 0.4
If it exceeds 0 μm, haze increases and visibility becomes poor.

As the transparent conductive film of the present invention, tin oxide is 2
There is an ITO film containing about 20% by weight or a tin oxide film doped with antimony or fluorine. As a method for forming the transparent conductive film, a PVD method such as a sputtering method, a vacuum evaporation method, an ion plating method, a coating method, a printing method, or a CV method is used.
Although there is the D method, the PVD method or the CVD method is preferable. P
In the case of the VD method or the CVD method, the thickness of the transparent conductive film is preferably 5 to 50 nm from the viewpoint of transparency and conductivity.

The matrix type transparent tablet using the transparent conductive laminate of the present invention has sufficient keystroke durability, but in the case of the analog type transparent tablet, the writing durability tends to be slightly lowered. is there.

In order to solve this problem, a layer formed by hydrolysis of an organosilicon compound is provided as an intermediate layer between the roughened layer formed on the transparent organic polymer molded product substrate and the transparent conductive film. I examined the method. However, it was found that the layer formed by the hydrolysis of the organosilicon compound became a non-uniform film on the roughened layer and became cloudy. This was presumed to be due to the interaction between the roughened layer and the organosilicon compound.

Therefore, first, after forming a layer containing titanium oxide and / or zirconium oxide on the roughened layer,
When a layer formed by hydrolysis of the organosilicon compound was provided, a uniform and transparent film was obtained. Furthermore, a transparent conductive film was formed on this to obtain a transparent conductive laminate. An analog type transparent tablet using a transparent conductive laminate provided with such an intermediate layer composed of two layers showed excellent writing durability.

Further, by setting the thickness of titanium oxide and zirconium oxide to 20 to 60 nm and the thickness of the layer formed by hydrolysis of the organosilicon compound to 20 to 60 nm, the transparency of the transparent tablet can be improved. Do you get it. It was found that when the thickness of one of the layers is out of the above range, the transparency is lowered as compared with the case where the intermediate layer is not provided, which is not preferable.

On the other hand, it has been found that the writing durability of the analog type transparent tablet is improved also by the method of using the transparent conductive laminate having the film mainly made of crystalline indium oxide as the transparent conductive film.

The layer containing titanium oxide and / or zirconium oxide is formed by a PVD method such as a sputtering method, a vacuum vapor deposition method, an ion plating method, or by hydrolysis of an alkyl ester mainly containing Ti and / or Zr. can do. Among these, the method of hydrolyzing an alkyl ester containing Ti and / or Zr is preferable in terms of adhesion and ease of film formation.

Alkyl ether containing Ti and / or Zr
Stell is the general formula Ti_sO_t(R ¹)_uRepresented by
Ruquiltitanate and / or ZrX_p(OR²)
_4-pIs an alkyl zirconate represented by.

Here, R ¹ is an alkyl group, and s, t, and u are positive integers. Among the alkyl titanates represented by the above general formula, t = 4 + (s−1) × 3, u
= 4 + (s−1) × 2, and s = 1 to 30 are preferably used in terms of ease of coating and characteristics. The value of s may have a distribution rather than a single value, but an alkyl titanate having a maximum distribution of the value of s of 15 or less is particularly preferable in terms of coating solution viscosity and hydrolysis.

In the above general formula, the alkyl substituent R ¹ preferably has 1 to 20 carbon atoms.
In particular, an alkyl substituent having 2 to 11 carbon atoms is preferably used from the viewpoints of film forming operation, for example, coating easiness, hydrolysis rate, mechanical properties and transparency of the obtained film.

A mixture of two or more of the above alkyl titanates may be used. A solution prepared by dissolving the alkyl titanate in an organic solvent is hydrolyzed when applied, and is dealkylated by a subsequent condensation reaction to form a stitch structure. By selecting the coating conditions, the alkyl titanate approaches titanium oxide.

The alkyl titanate used in the present invention includes, for example, tetrabutyl titanate, tetraethyl titanate, tetrapropyl titanate, tetrastearyl titanate, tetra-2-ethylhexyl titanate, diisopropoxytitanium bisacetylacetonate and the like. Tetrabutyl titanate,
Tetrapropyl titanate is preferably used. These alkyl titanates may be used as they are, and those obtained by precondensing dimers, tetramers, and tenmers may also be preferably used. Furthermore, these alkyl titanates may be used after being stabilized with a substance such as acetylacetone.

In the alkyl zirconate represented by the above general formula, X is an alkyl group having 1 to 6 carbon atoms,
Alternatively, it is a residue of a halogenated alkyl group, a phenyl group, a vinyl group, or a β-diketone compound or a β-ketoester compound. In addition, R ² has 1 to 1 carbon atoms
6 is an alkyl group, and p is an integer of 0-4.

Examples of zirconium compounds include acetylacetone zirconium salts (tributoxyzirconium acetylacetonate, dibutoxyzirconium diacetylacetonate, monobutoxyzirconium triacetylacetonate, etc.), zirconium tetraalkoxides (tetrabutyl zirconate, tetrapropyl zirconate, etc.). Etc.), zirconium-trialkoxy-monoalkylacetoacetate (zirconium-tributoxy-monoethylacetoacetate etc.), zirconium-
Examples include dialkoxy-dialkylacetoacetate (zirconium-dibutoxy-diethylacetoacetate, etc.) and zirconium-monoalkoxy-trialkylacetoacetate (zirconium-monobutoxy-triethylacetoacetate, etc.).

The organosilicon compound used in the present invention is
One or two compounds selected from the group consisting of a compound represented by the following general formula (1) and / or an oligomer formed by hydrolysis thereof. However, in the general formula (1), R ³ is a hydrogen atom or has 1 to 2 carbon atoms.
Or an alkyl group represented by the following general formula (2).

[0034]

Embedded image

[0035]

Embedded image

R ⁴ is a hydrogen atom or has 1 to 1 carbon atoms.
2 alkyl groups, R ⁵ and R ⁶ each independently represent an alkyl group having 1 to 2 carbon atoms, x and y each independently represent an integer of 1 to 3, and w represents 0 or an integer of 1 or 2. ,
z represents an integer of 1 to 3, and w + z = 3.
Further, in the general formula (2), R ⁷ and R ⁸ are each independently a hydrogen atom or a group selected from the group consisting of alkyl groups having 1 to 2 carbon atoms.

Among them, especially in terms of writing durability, a functional group
The amino group (-NH₂) Is preferable, for example
If NH₂-(CH₂)₃-Si- (OCH₃)₃, And
And / or NH₂-(CH₂)₃-Si- (OC
₂H_Five)₃And / or NH ₂-(CH₂)₂−
NH- (CH₂)₃-Si- (OCH₃)₃,and/
Or NH₂-(CH₂)₂-NH- (CH₂)₃-S
i- (OC₂H_Five)₃, And / or NH₂-(CH
₂)₂-NH- (CH₂)₃-Si (CH₃)-(OC
H₃)₂, And / or NH₂-(CH₂)₂-NH
-(CH₂)₃-Si (CH₃)-(OC₂H_Five)₂,
And / or produced by hydrolysis of
Selected from the group consisting of oligomers having an association degree of 10 or less
Particularly preferred is one or more compounds
Yes.

The above-mentioned alkyl titanate, alkyl zirconate, and organosilicon compound are usually used in a coating solution dissolved in an organic solvent and dried after coating, followed by heating, ion bombardment, or radiation such as ultraviolet rays, β rays, γ rays. To cure. If necessary, it may be used in admixture with a curing catalyst, an adhesion promoter, a wettability improver, a plasticizer, various stabilizers, a flame retardant, an antioxidant, a lubricant, an antifoaming agent and / or a thickener.

For coating, a method using a known coating machine such as a doctor knife, a bar coater, a gravure roll coater, a curtain coater, a knife coater, a spray method, a dipping method, or the like is used.

The thickness of the transparent conductive film mainly made of crystalline indium oxide is 5 to 50 in terms of transparency and conductivity.
nm is preferred. As a method for forming the transparent conductive film, a PVD method such as a sputtering method, a vacuum deposition method, an ion plating method is preferable.

As a measure for improving the writing durability, the method of providing the intermediate layer consisting of the above-mentioned two layers and the method of providing the transparent conductive film mainly composed of crystalline indium oxide may be used together.

[0042]

Examples 1 and 2, Comparative Examples 1 and 2 FIG. 1 is a transparent tablet showing an example of the present invention. In the figure, 1 is a glass substrate, 2 and 6 are transparent conductive films, 3 is a dot spacer, 4 is a polyethylene terephthalate film, 5 is a hard coat layer, and 7 is a roughened layer. The glass substrate 1, the transparent conductive film 2 and the dot spacers 3 constitute a lower electrode substrate, and the transparent conductive film 6, the polyester film 4, the roughening layer 7 and the hard coat layer 5 constitute an upper electrode substrate. There is.

In order to manufacture such a transparent tablet, first, SiO 2 is formed on both sides of the glass plate 1 having a thickness of 1.1 mm.
After performing the ₂ dip coating, by sputtering to form an ITO film having a thickness of 18nm as transparent conductive film 2. Next, on the ITO film, height 7 μm, diameter 70 μm,
A lower electrode substrate was manufactured by forming dot spacers 3 having a pitch of 1.5 mm.

On the other hand, a UV-curable urethane acrylate resin coating prepared by mixing silica particles on one side of a polyethylene terephthalate film 4 (trade name "HLW" manufactured by Teijin Ltd.) having a thickness of 188 μm as a transparent organic polymer molded product substrate. Was used to form a hard coat layer 5 having a thickness of 3 μm. Next, on the opposite surface side, using a paint with a different mixing ratio of silica particles and an ultraviolet curable urethane acrylate resin,
Roughening layers 7 having different surface roughnesses with a thickness of 1 μm were formed (Examples 1-2, Comparative Examples 1-2). By forming an amorphous ITO film having a thickness of 18 nm as the transparent conductive film 6 on the surface on which the roughened layer is formed by a sputtering method,
An upper electrode substrate was produced.

Then, using the upper electrode substrate and the lower electrode substrate, the analog type transparent tablet shown in FIG. 1 was produced. Note that this drawing is a part of the configuration, and the surrounding insulating layer, the adhesive layer, and the circuit for drawing out to the outside are omitted.

Center surface average roughness (SRa) of the upper electrode substrate and the lower electrode substrate and the total light transmittance of the transparent tablet,
Table 1 shows the haze measurement results, the observation results of the interference fringes of the transparent tablet, and the writing durability evaluation results.

The writing durability test method is as follows. First, using a polyacetal pen having a tip of 0.8R, katakana characters are written in the order of Japanese syllabary in a central 20 mm square area of the hard coat surface of the transparent tablet upper electrode. The load is 250g. The pen is replaced and the linearity is measured every 30,000 characters. The writing durability is defined as the number of writings until the linearity exceeds 1.5%.

[0048]

Comparative Example 3 An analog transparent tablet shown in FIG. 3 was produced under the same conditions as in Example 1 except that the roughening layer 7 was not provided.

Therefore, first, a lower electrode substrate was manufactured under the same conditions as in Example 1, using the glass plate 1 having a thickness of 1.1 mm. On the other hand, a polyethylene terephthalate film 4 having a thickness of 188 μm (trade name “HLW” manufactured by Teijin Ltd.)
A hard coat layer 5 having a thickness of 3 μm was formed by using an ultraviolet-curable urethane acrylate resin paint containing silica particles mixed on one surface thereof. Then, on the opposite surface, an amorphous I film having a thickness of 18 nm was formed by a sputtering method without forming a roughened layer.
An upper electrode substrate was produced by forming the TO film as the transparent conductive film 6.

Then, using the upper electrode substrate and the lower electrode substrate, an analog type transparent tablet shown in FIG. 3 was produced. Note that this figure is a part of the configuration, and the surrounding insulating layer,
The adhesive layer and the circuit for drawing to the outside are omitted. Then, evaluation was performed under the same conditions as in Example 1, and the results are shown in Table 1.

[0051]

Examples 3 to 4 First, a lower electrode substrate was manufactured under the same conditions as in Example 1, using the glass plate 1 having a thickness of 1.1 mm.

On the other hand, a polyethylene terephthalate film 4 having a thickness of 188 μm (trade name “HL manufactured by Teijin Ltd.”
W ”) was used to form the hard coat layer 5 on one surface and the roughened layer 7 on the other surface under the same conditions as in Example 1.

In Example 3, an indium tin lower oxide film was first formed on the surface-roughened layer 7 by the sputtering method and then heat-treated at 150 ° C. for 15 hours to give a thickness of 18
An upper electrode substrate was produced by forming a crystalline ITO film having a thickness of nm as the transparent conductive film 6.

As Example 4, on the roughened layer 7,
Tetrabutyl titanate (Nippon Soda Co., Ltd.) 7.5
A wt% content of ligroin / butanol solution was applied with a bar coater and then dried at 130 ° C. for 5 minutes to form an intermediate layer 8 as a layer containing titanium oxide. The film thickness of the intermediate layer 8 after drying is 30 nm. Subsequently, the molecular formula NH ₂ −
A ligroin / butanol / ethanol / ethyl cellosolve solution containing 1.0% by weight of an oligomer having an association degree of 5 formed by hydrolysis of a compound represented by (CH ₂ ) ₃ —Si— (OC ₂ H ₅ ) ₃ was prepared as a bar. After applying with a coater,
It was dried at 130 ° C. for 5 minutes to form the intermediate layer 9 as a layer formed by hydrolysis of the organosilicon compound. The film thickness of the intermediate layer 9 after drying is 30 nm.

In Example 4, next, an indium tin lower oxide film was first formed by a sputtering method and then at 150 ° C.
Then, the upper electrode substrate was prepared by heat-treating for 15 hours and forming a crystalline ITO film having a thickness of 18 nm as the transparent conductive film 6.

Using the upper electrode substrate and the lower electrode substrate, analog type transparent tablets shown in FIG. 1 (Example 3) and FIG. 2 (Example 4) were prepared in the same manner as in Example 1. Note that this figure is a part of the configuration, and the surrounding insulating layer,
The adhesive layer and the circuit for drawing to the outside are omitted. Then, evaluation was performed under the same conditions as in Example 1, and the results are shown in Table 1.

[0057]

Examples 5 to 12 Using the glass plate 1 having a thickness of 1.1 mm, lower electrode substrates were prepared under the same conditions as in Example 1. On the other hand, using a polyethylene terephthalate film 4 (trade name “HLW” manufactured by Teijin Ltd.) having a thickness of 188 μm,
Under the same conditions as in Example 1, the hard coat layer 5 was formed on one surface and the roughened layer 7 was formed on the opposite surface. The center surface average roughnesses (S) of the upper electrode substrate side and the lower electrode substrate side obtained here are respectively obtained.
Ra) was 0.07 μm and 0.005 μm, respectively.

Next, a ligroin / butanol solution having a different content of tetrabutyl titanate (manufactured by Nippon Soda Co., Ltd.) was applied on the roughened layer 7 by a bar coater and then at 130 ° C.
Intermediate layer 8 as a layer containing titanium oxide after drying for 5 minutes
Was formed. Subsequently molecular formula _{NH 2 - (CH 2) 3} -
A ligroin / butanol / ethanol / ethyl cellosolve solution having a different content of an oligomer having an association degree of 5 formed by hydrolysis of a compound represented by Si- (OC ₂ H ₅ ) ₃ was applied with a bar coater and then at 130 ° C. It was dried for 5 minutes to form an intermediate layer 9 as a layer formed by hydrolysis of the organosilicon compound. Then, here, the thicknesses of the intermediate layers 8 and 9 were variously changed to give Examples 5 to 12.

Then, an indium tin lower oxide film is first formed by a sputtering method, and then heat treatment is performed at 150 ° C. for 15 hours to form a crystalline ITO film having a thickness of 18 nm as the transparent conductive film 6, thereby forming an upper electrode substrate. Was produced.

Then, using the upper electrode substrate and the lower electrode substrate, the analog type transparent tablet shown in FIG. 2 was prepared in the same manner as in Example 4. Note that this drawing is a part of the configuration, and the surrounding insulating layer, the adhesive layer, and the circuit for drawing out to the outside are omitted. The transparent tablets thus obtained were evaluated in the same manner as in Example 1, and the results are shown in Table 2.

[0061]

[Table 1]

[0062]

[Table 2]

[0063]

The transparent tablet using the transparent conductive laminate of the present invention has no interference fringes, has a small haze, and is excellent in visibility. If the surface roughness is less than the range of the present invention, there is no effect of preventing interference fringes, and if the surface roughness exceeds the range of the present invention, haze is high and visibility is poor.

Further, by the method of forming an intermediate layer between the roughening layer and the transparent conductive film, and / or the method of using a film mainly made of crystalline indium oxide as the transparent conductive film, it is possible to visually check without generation of interference fringes. A transparent tablet having excellent properties and extremely excellent writing durability can be obtained. Further, the thickness of titanium oxide and zirconium oxide in the intermediate layer is 20 to 60 nm, and the thickness of the layer formed by hydrolysis of the organosilicon compound is 20 to 60 nm to improve the transparency of the transparent tablet. be able to. The present invention is not limited to the analog type transparent tablets shown in the embodiments, but can be applied to matrix type transparent tablets.

As described above, in the organic polymer molded product having at least one surface roughened, the transparent conductive film is formed on the surface having the center surface average roughness (SRa) in the range of 0.05 to 0.40 μm. The transparent tablet using the transparent conductive laminate obtained by forming is excellent in visibility without generation of interference fringes. In addition, a transparent tablet excellent in writing durability can be obtained by a method of forming an intermediate layer between the roughened layer and the transparent conductive film and / or a method of using a film mainly composed of crystalline indium oxide as the transparent conductive film. can get. Also, by optimizing the thickness of the intermediate layer, a transparent tablet with good transparency can be obtained, which is of great significance in practical use.

[Brief description of drawings]

FIG. 1 Transparent tablet provided with a roughened layer

[FIG. 2] Transparent tablet provided with an intermediate layer

FIG. 3 Transparent tablet without roughening layer

[Explanation of symbols]

 1 Glass Substrate 2, 6 Transparent Conductive Film 3 Dot Spacer 4 Polyethylene Terephthalate Film 5 Hard Coat Layer 7 Roughening Layer 8, 9 Intermediate Layer

Claims (6)

[Claims] 1. In a transparent conductive laminate comprising a transparent organic polymer molded product on which a transparent conductive film is formed, a substrate surface on which at least one transparent conductive film is formed is a central surface. Average roughness (SRa) is 0.05 to 0.40
A transparent electroconductive laminate characterized by being roughened in the range of μm. 2. The surface of the substrate is roughened by forming a roughening layer on the substrate, and the roughening layer is a thermosetting resin or an ultraviolet curable resin and silica fine particles. The transparent electroconductive laminate according to claim 1, which is composed of a layer in which 3. A layer mainly containing titanium oxide and / or zirconium oxide and a layer formed by hydrolysis of an organosilicon compound are provided in this order between the roughened transparent conductive film on the substrate surface. It provided, The transparent conductive laminated body in any one of Claims 1-2. 4. The layer containing titanium oxide and / or zirconium oxide has a thickness of 20 to 60 nm, and the layer formed by hydrolysis of an organosilicon compound has a thickness of 20 to 6.
It is 0 nm, The transparent conductive laminated body of Claim 3 characterized by the above-mentioned. 5. The transparent conductive laminate according to claim 1, wherein the transparent conductive film is mainly made of crystalline indium oxide. 6. A transparent tablet, which is configured by arranging two transparent electrode substrates having a transparent conductive film provided on at least one surface so that the transparent conductive films face each other, and the transparent tablet serves as a transparent electrode substrate. A transparent tablet characterized by using the transparent electroconductive laminate according to any one of 1 to 5.