JP2000193806A - Clear coat plate, manufacture of the same, transparent conductive plate and flat panel input device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent interference fringes from generating in a single clear coat plate without degradation of transparency which a clear coat plate itself essentially has. SOLUTION: A clear coat plate 10 comprises a transparent protective coating 16 formed on a first surface 14a of a transparent insulated substrate 14. The protective coating 16 comprises a transparent main coating layer 18 and a plurality of solid fine particles 20 dispersedly arranged in the main coating layer 18. The solid fine particles 20 have the particle size and arrangement intervals allowing to maintain the transparency of the protective coating 16. The main coating layer 18 comprises a first transparent layer 22 containing the solid fine particles 20 in uniform dispersion arrangement and laminated on the first surface 14a of the insulated substrate 14 and a second transparent layer 24 laminated on the first layer 22, in which a surface 24a of the second layer 24 hamps like a waveform on positions of each solid fine particles 20 as a center. Thus, the thickness of the protective coating 16 continuously varies like a waveform in relation to the position of these solid fine particles 20, which prevents interference fringes from generating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a clear coat plate having a transparent substrate and a transparent film formed on one surface of the substrate, and a method for manufacturing the same. Further, the present invention relates to a transparent conductive plate provided with such a clear coat plate and a panel-type input device.

[0002]

2. Description of the Related Art In recent years, digital data processing apparatuses having displays, such as personal computers, word processors, and electronic organizers, have been installed on display screens such as LCDs (liquid crystal displays), PDPs (plasma panels), and CRTs (CRTs). A panel-type input device in which an operator presses a desired position of the transparent panel with a pen or a finger to input two-dimensional coordinate data on a display in an analog manner is widely used, for example, as a touch panel.

A conventional panel-type input device generally includes a pair of plate-like detecting elements, that is, conductive plates each having an insulating substrate and a resistive film provided on the surface of the insulating substrate. The conductive plates are superposed at intervals with the resistive films facing each other. The distance between the two conductive plates is ensured by a large number of dot spacers distributed on the surface of the resistive film of one conductive plate. The dot spacer suppresses at least deformation of the conductive plate due to its own weight and maintains the interval between the two conductive plates, and allows short circuit between the two resistive films when any of the conductive plates is deformed under the pressing force. Usually, the insulating substrate of the upper conductive plate pressed by the operator is formed of a resin film because flexibility is required, while the insulating substrate of the lower conductive plate disposed adjacent to the display screen is It is formed from a glass plate, a plastic plate, a resin film or the like.

[0004] Each conductive plate further includes a pair of parallel electrodes, ie, a pair of electrodes, which are respectively disposed on outer edges of the resistive film facing each other and connected to the resistive film. In the pair of overlapping conductive plates, each electrode pair is arranged at a position different from each other by 90 degrees. A predetermined voltage is alternately applied to both resistance films between each pair of electrodes. In this state, when a desired position on the outer surface of the insulating substrate of the upper conductive plate is pressed with, for example, a finger, the two resistive films are short-circuited to each other at the pressed portion, and the resistive film on the side to which no voltage is applied corresponds to the position of the pressed portion. The measured partial pressure is measured. The two-dimensional coordinates of the pressed portion are specified by measuring the partial pressure alternately generated in the two resistance films in this manner.

Conventional panel-type input devices are known in which both a pair of conductive plates have high transparency and those in which at least an upper conductive plate pressed by an operator uses a frosted glass-like translucent body. ing. The former panel-type input device combining a transparent conductive plate has the advantage of enabling clear see-through without deteriorating the image quality of the display, but the surface (pressing operation surface) of the insulating substrate of the upper transparent conductive plate is Since it has a mirror-like flatness, it is easy to reflect light, which may deteriorate the visibility of the display.
On the other hand, the latter panel-type input device using a translucent conductive plate has an advantage that reflection of light can be suppressed,
It is essentially inferior in the visibility of the display.

[0006]

In the conventional panel-type input device having the above-mentioned pair of transparent conductive plates, in addition to the reflection of light on the surface of the upper transparent conductive plate, the upper transparent conductive plate and the lower transparent conductive plate are reflected. Light interference tends to occur between the transparent conductive plate and the transparent conductive plate. Here, a transparent protective film having a uniform thickness is usually formed on the upper transparent conductive plate on the surface of the insulating substrate on the opposite side of the resistive film in order to prevent the conductive plate surface from being damaged by a pressing operation by an operator. are doing. Particularly in such a configuration, the upper transparent conductive plate itself, that is, as a single body, easily causes interference between reflected light on the mirror-like surface of the protective film and reflected light on the interface between the protective film and the insulating substrate,
There is a problem that the interference fringes generated thereby may adversely affect the fluoroscopic image.

[0007] The present invention relates to a clear coat plate comprising a transparent substrate, such as a combination of an insulating substrate and a protective film in a transparent conductive plate of this type, and a transparent film formed on one surface of the substrate. Focusing on the structure of the transparent coating plate, the problem of interference fringe generation in the transparent conductive plate and the panel type input device using it is solved by devising and improving to surely prevent the occurrence of interference fringes on the clear coat plate alone What you want to do.

Therefore, an object of the present invention is to provide a clear coat plate having a transparent substrate and a transparent film formed on one surface of the substrate without deteriorating the transparency inherent in the clear coat plate itself. It is another object of the present invention to provide a clear coat plate excellent in visibility which can prevent the occurrence of interference fringes in a clear coat plate alone, and a method of manufacturing the same. Another object of the present invention is to provide a high-performance transparent conductive plate having such a clear coat plate having excellent visibility. It is still another object of the present invention to provide a panel-type input device including such a high-performance transparent conductive plate and capable of clear viewing without deteriorating the image quality of a display.

[0009]

Means for Solving the Problems To achieve the above object, an invention according to claim 1 is directed to a clear coat plate comprising a transparent substrate and a transparent film formed on one surface of the substrate. , The film is composed of a transparent main film layer and a plurality of fine substances dispersed in the main film layer while maintaining the transparency of the film, and the thickness of the film in relation to the positions of the fine substances. A clear coat plate characterized by having a wavy shape.

According to a second aspect of the present invention, there is provided the clear coat plate according to the first aspect, wherein the plurality of fine substances comprise a plurality of solid fine particles having a particle size and an arrangement interval capable of maintaining the transparency of the film. Provide a coated board. Claim 3
The invention according to claim 2, wherein in the clear coat plate according to claim 2, the main coating layer of the coating contains a plurality of solid fine particles and is laminated on the surface of the substrate with a transparent first layer; A clear coat plate comprising a transparent second layer laminated thereon, and a surface of the second layer opposite to the first layer protruding in a wavy form around the positions of the plurality of solid fine particles.

According to a fourth aspect of the present invention, in the clear coat plate according to the third aspect, the first layer has a thickness of 1 μm to 10 μm.
A clear coat plate having a thickness of The invention according to claim 5 provides the clear coat plate according to claim 3 or 4, wherein the second layer has a thickness of 3 μm to 30 μm. The invention according to claim 6 provides the clear coat plate according to any one of claims 2 to 5, wherein the particle diameter of the solid fine particles is in the range of 10 µm to 50 µm.

According to a seventh aspect of the present invention, there is provided the clear coat plate according to any one of the second to sixth aspects, wherein the solid fine particles are silica, glass beads, alumina, titanium oxide, zinc oxide, magnesium oxide, Provided is a clear coat plate formed from a powdery material selected from calcium carbonate, barium sulfate, polyethylene, polypropylene, polystyrene, urea resin and acrylic resin. According to an eighth aspect of the present invention, in the clear coat plate according to the first aspect, the plurality of fine substances are formed of a plurality of liquid fine particles that make the interfacial tension between the film and the substrate non-uniform. provide.

According to a ninth aspect of the present invention, there is provided the clear coat plate according to the eighth aspect, wherein the liquid fine particles are selected from the group consisting of silicone oil, mineral oil, polybutene oil, polyolefin oil and polyparaffin oil. A clear coat plate formed from the additive is provided.
The tenth aspect of the present invention is directed to any one of the first to ninth aspects.
The clear coat plate according to the above item, wherein a plurality of fine substances are dispersed in the main coating layer at intervals of 0.1 mm to 1.0 mm.

[0014] The invention according to claim 11 is the invention according to claims 1-1.
0. In the clear coat plate according to any one of 0, the main coating layer of the coating is a thermosetting acrylic resin, an ultraviolet curing acrylic resin, a silicone resin, a polyester resin, a polycarbonate resin, a melamine resin, a urea resin, and a thermosetting resin. Provided is a clear coat plate formed from a resin material selected from a mold methacrylic resin.

According to a twelfth aspect of the present invention, there is provided a method for manufacturing a clear coat plate comprising a transparent substrate and a transparent film formed on one surface of the substrate, wherein at least a transparent molten resin is cured at the time of curing. A coating material prepared by mixing microscopic substances in a desired dispersion state is prepared, the coating material is applied to the surface of the substrate, the coating material is cured, and the thickness is corrugated in relation to the positions of the plurality of microscopic substances. The present invention provides a method for producing a clear coat plate, characterized by forming the fluctuating film.

According to a thirteenth aspect of the present invention, in the method for producing a clear coat plate according to the twelfth aspect, the plurality of fine substances have a plurality of solid fine particles having a particle size and an arrangement interval capable of maintaining the transparency of the film. A production method comprising:
According to a fourteenth aspect of the present invention, in the method for manufacturing a clear coat plate according to the thirteenth aspect, after the coating material is cured to form the first layer, a transparent melt is formed on the first layer at least during curing. A second coating material made of a resin is applied and cured to form a second layer, whereby the surface of the second layer opposite to the first layer rises in a wave shape around the positions of the plurality of solid fine particles. Provided is a manufacturing method for forming a film formed by:

According to a fifteenth aspect of the present invention, in the method for manufacturing a clear coat plate according to the twelfth aspect, the plurality of fine substances are provided with a plurality of liquid fine particles for making the interfacial tension between the film and the substrate non-uniform. A production method comprising: Claim 1
The invention described in Item 6 is a transparent insulating substrate and a first insulating substrate.
A transparent conductive plate comprising a clear coat plate having a transparent protective film formed on the surface and a transparent resistive film formed on the second surface of the insulating substrate opposite to the first surface. A transparent conductive plate comprising the clear coat plate according to any one of claims 1 to 11.

The invention according to claim 17 has a transparent insulating substrate, a transparent resistive film provided on the surface of the insulating substrate, and an electrode pair connected to the resistive film and formed on the insulating substrate, respectively. A pair of transparent conductive plates disposed with the resistive films facing each other, and disposed between the transparent conductive plates, separating the resistive films from each other and allowing a short circuit between the resistive films when at least one of the insulating substrates is deformed. A panel type input device comprising a spacer and a spacer, wherein one of the transparent conductive plates is made of the transparent conductive plate according to claim 16.

[0019]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In the drawings, the same or similar components are denoted by common reference numerals. FIG.
Is a clear coat plate 10 according to the first embodiment of the present invention.
FIG. 2 is a partially enlarged cross-sectional view of FIG.
FIG. 1 is a partially enlarged cross-sectional view of a transparent conductive plate 12 according to an embodiment of the present invention, which is provided. The transparent conductive plate 12 is a transparent panel type input device installed on a display screen,
It can be particularly suitably used as an upper conductive plate pressed by an operator.

The clear coat plate 10 includes a transparent transparent electrically insulating substrate 14 (hereinafter, referred to as an insulating substrate 14) and a transparent protective film 16 formed on a first surface 14a of the insulating substrate 14. And The transparent conductive plate 12 further includes a transparent resistive film 17 formed on a second surface 14b of the clear coat plate 10 opposite to the first surface 14a of the insulating substrate 14. The protective film 16 includes a transparent main film layer 18,
The protective film 16 is composed of a plurality of fine substances 20 dispersedly disposed in the main film layer 18 while maintaining the transparency. The overall thickness of the protective coating 16 depends on the fine substance 20.
Fluctuates continuously in relation to the position of.

The terms "transparency" and "transparency" used in the present specification mean that an object on one side of the clear coat plate is sharply and desirably passed through the clear coat plate from the other side of the clear coat plate. This means transparency that allows the user to see through at a level that can accurately recognize the contours and shadows of the object. Further, the term "wavy" used in the present specification refers to a state in which the thickness of the protective film repeats a gradual change over the entire film, and a smooth undulation is continuously formed over the entire surface of the main film layer. It shows the state that it is.

In the clear coat plate 10, the plurality of fine substances 20 are composed of a plurality of solid fine particles 20 having a particle size and an arrangement interval capable of maintaining the transparency of the protective film 16. In addition, the main coating layer 18 of the clear coat plate 10 contains a plurality of solid fine particles 20 in a uniformly dispersed arrangement, and includes a transparent first layer 22 laminated on the first surface 14 a of the insulating substrate 14.
And a transparent second layer 24 laminated on the first layer 22. Surface 24a of second layer 24 opposite first layer 22
As shown in the drawing, each of the plurality of solid fine particles 20 has a wave-like bulge around each position.

Specifically, a plurality of solid fine particles 20 having a particle diameter preferably distributed in a range of 10 μm to 50 μm are used. If the particle size is less than 10 μm, the main coating layer 1
8, the height of the wavy ridge formed on the surface 24a of the second layer 24 tends to be low, and the effect of preventing the generation of interference fringes described later tends to be insufficient. On the other hand, when the particle size exceeds 50 μm, the solid fine particles 20 in the main coating layer 18 become visible, and the transparency of the protective coating 16 tends to deteriorate.

Further, the interval between the plurality of solid fine particles 20 is preferably in the range of 0.1 mm to 1.0 mm.
If the arrangement interval is less than 0.1 mm, the density of the solid fine particles 20 in the main coating layer 18 becomes excessive, and the transparency of the protective coating 16 tends to deteriorate. On the other hand, if the arrangement interval exceeds 1.0 mm, the interval between the wavy ridges formed on the surface 24a of the second layer 24 of the main coating layer 18 becomes too large, and the effect of preventing the generation of interference fringes tends to be insufficient. There is.

Further, the first layer 22 of the main coating layer 18 is
It preferably has a thickness of from 10 μm to 10 μm. If the thickness of the first layer 22 is less than 1 μm, the solid fine particles 20 cannot be sufficiently covered, and the solid fine particles 20 tend to fall off and the first layer 22 itself tends to peel off. On the other hand, when the thickness of the first layer 22 exceeds 10 μm, local protrusions, which will be described later, formed on the surface of the first layer 22 become small, so that the height of the wavy protrusions on the surface 24a of the second layer 24 becomes low. And the effect of preventing the occurrence of interference fringes tends to be insufficient.

The second layer 24 of the main coating layer 18 has a thickness of 3 μm.
It preferably has a thickness of m to 30 μm. Second layer 2
4 is less than 3 μm, the surface 24a of the second layer 24
In addition, local ridges (that is, lack of smoothness) along local ridges on the surface of the first layer 22 are left, and the effect of preventing the generation of interference fringes tends to be insufficient. On the other hand, the second
If the thickness of the layer 24 exceeds 30 μm, the wavy ridge on the surface 24a of the second layer 24 tends to be small or disappear, and the effect of preventing the generation of interference fringes tends to be insufficient.

The clear coat plate 10 can be manufactured, for example, by the following method. First, the first layer 22 of the main coating layer 18
A first coating material is prepared by mixing a plurality of solid fine particles 20 having the above-mentioned particle diameter in a desired dispersion state with at least a transparent molten resin material which is a raw material for the above-mentioned curing.
At this time, the dispersion state of the solid fine particles 20 is such that the transparency of the protective film 16 formed through the subsequent steps can be sufficiently maintained. In order to obtain such a dispersion state, a desired dispersant is added to the first coating material. In consideration of the above-mentioned particle diameter and arrangement interval of the solid fine particles 20, 10
For example, 1 to 10 parts by weight of the solid fine particles 20 may be mixed with 0 parts by weight of the molten resin material.

Next, the first coating material is applied to the first substrate of the insulating substrate 14.
The surface 14a is applied to a uniform desired thickness by a known roll coating method, bar coating method, or the like.
Then, by drying or curing the first coating material,
As shown in FIG. 3, a transparent first layer 22 containing a plurality of solid fine particles 20 at the above-described arrangement intervals is formed on the first surface 14a of the insulating substrate 14 to have the above-described thickness. At this stage, the first layer 22 is provided with a substantially uniform thickness except for the portion overlapping the plurality of solid fine particles 20, and the surface of the first layer 22 on the opposite side of the insulating substrate 14 has a plurality of thicknesses. Is locally formed at the position of the solid fine particles 20.

Next, on the first layer 22, a second coating material, which is a raw material of the second layer 24 of the main coating layer 18 and is made of at least a transparent molten resin material at the time of curing, is applied by, for example, a known roll coating method or bar coating. It is applied to a uniform desired thickness by a method or the like. Then, by drying or curing the second coating material, the transparent second layer 24 is formed to have the thickness described above. The second coating material covers local bumps on the surface of the first layer 22 in the application step, and forms gentle undulations on the surface as the hardening of the second coating material itself proceeds. Therefore, at this stage, on the surface 24a of the second layer 24 opposite to the first layer 22, a wavy ridge is continuously formed around each position of the plurality of solid fine particles 20 as shown in FIG. . Thus, the plurality of solid fine particles 2
A protective film 16 whose entire thickness continuously changes in a wave-like manner in relation to the position of 0 is formed on the first surface 14a of the insulating substrate 14, and the clear coat plate 10 of FIG. 1 is completed.

Further, the transparent conductive film 12 shown in FIG. 2 is completed by coating the second surface 14b of the insulating substrate 14 with the transparent resistive film 17 using the clear coat plate 10 thus manufactured.

According to the clear coat plate 10 having the above-described structure, local thickness fluctuations formed on the first layer 22 of the main coating layer 18 of the protective coating 16 due to the presence of the plurality of solid fine particles 20 are provided. This is alleviated by laminating the second layer 24 on the first layer 22, whereby smooth undulations are continuously formed over the entire surface 24 a of the second layer 24. As a result, the reflected light on the gently undulating surface 24a of the protective film 16 and the protective film 16 and the insulating substrate 1
4, that is, a flat first surface 14 a of the insulating substrate 14.
Is less likely to occur due to variations in the optical path difference, and the occurrence of interference fringes on the clear coat plate 10 alone is prevented. Moreover, the plurality of solid fine particles 20 dispersed and arranged in the first layer 22 form the protective film 16.
Has a particle size and an arrangement interval that can sufficiently maintain the transparency of the clear coat plate 10 itself. Therefore, the object on one side of the clear coat plate 10 can be seen through the clear coat plate 10 from the other side of the clear coat plate 10 clearly, desirably at a level at which the contour and shadow of the object can be accurately recognized.

Further, according to the transparent conductive plate 12 having the clear coat plate 10, the occurrence of interference fringes on the transparent conductive plate 12 alone is similarly prevented. In addition, the object on one side of the transparent conductive plate 12 can be seen through the transparent conductive plate 12 from the other side of the transparent conductive plate 12 clearly, preferably at a level at which the contour and shadow of the object can be accurately recognized. Therefore, by using the transparent conductive plate 12 as the upper conductive plate of the panel-type input device, an image can be clearly seen without generating interference fringes and without deteriorating the image quality of the display.

As described above, the effect of preventing the occurrence of interference fringes caused by continuously changing the thickness of the protective film 16 in a wave-like manner is that the main film layer 18 has a two-layer structure of the first layer 22 and the second layer 24. By doing so, it can be obtained very easily. That is, when the main coating layer has a single-layer structure, it is understood that it is difficult to continuously form the above-mentioned gentle undulation over the entire surface of the main coating layer.
From this viewpoint, a main coating layer having a multilayer structure of three or more layers can be employed if desired.

The clear coat plate 10 can be formed, for example, from the following materials. The insulating substrate 14 can be formed from a transparent resin film such as polyethylene terephthalate (PET), polycarbonate (PC), and polyethersulfone (PES). First layer 2 of main coating layer 18 of protective coating 16
The second and second layers 24 are made of a thermosetting acrylic resin, an ultraviolet curing acrylic resin, a silicone resin, a polyester resin,
It can be formed from a transparent resin material such as a polycarbonate resin, a melamine resin, a urea resin, and a thermosetting methacrylic resin. The solid fine particles 20 are made of inorganic powder materials such as silica, glass beads, alumina, titanium oxide, zinc oxide, magnesium oxide, calcium carbonate, and barium sulfate, and resin powder materials such as polyethylene, polypropylene, polystyrene, urea resin, and acrylic resin. Can be formed.

Further, the resistance film 17 of the transparent conductive plate 12 is
It can be formed from a material having excellent conductivity such as indium tin oxide (ITO).

When the transparent conductive plate 12 having the clear coat plate 10 is applied to an upper conductive plate which is pressed by an operator in a panel-type input device, the main coating layer of the protective coating 16 will be described later. The surface 24a of 18 functions as a pressing operation surface. In this case, by forming the first layer 22 and the second layer 24 of the main coating layer 18 from the above-described material, sufficient durability against pen input operation and the like can be exhibited, and the insulating substrate 14 can be protected. . Further, since the wavy undulations formed on the surface 24a of the main coating layer 18 are minute, on the order of μm, as described above, they do not have a tactile effect on the pressing operation of the operator.

FIGS. 4 and 5 show a partially enlarged sectional view of a clear coat plate 30 according to a second embodiment of the present invention. The clear coat plate 30 has substantially the same configuration as the clear coat plate 10 of FIG. 1 except for the structure of the protective film.
Corresponding components are denoted by common reference numerals, and description thereof is omitted.

The protective film 32 of the clear coat plate 30 includes a transparent main film layer 34 and a plurality of fine substances 36 dispersed in the main film layer 34 while maintaining the transparency of the protective film 32. Is done. The overall thickness of the protective film 32 is
The fine substance 36 continuously changes in a wave-like manner in relation to the position. In the clear coat plate 30, the plurality of minute substances 36 are composed of a plurality of liquid fine particles 36 which act to make the interfacial tension between the protective film 32 and the insulating substrate 14 non-uniform.
Consists of

According to this configuration, an interfacial tension different from the interfacial tension between the insulating substrate 14 and the main coating layer 34 is generated between the insulating substrate 14 and the liquid fine particles 36, whereby the liquid fine particles 36 It takes the form of an oval or a dish as shown in the main coating layer 34. This form differs depending on the combination of the material of the liquid fine particles 36 and the material of the insulating substrate 14. For example, when the liquid fine particles 36 are made of a material that is hardly wetted by the insulating substrate 14, an oval shape long in the thickness direction of the protective film 32 is obtained as shown in FIG. Wavy ridges are formed on the surface 34a around the positions of the plurality of liquid fine particles 36. When the liquid fine particles 36 are made of a material that is easily wetted with respect to the insulating substrate 14, a dish-like form crushed in the thickness direction of the protective film 32 is obtained as shown in FIG. In the surface 34 a of the liquid crystal 34, a wave-shaped depression centering on each position of the plurality of liquid fine particles 36 is formed. In any case, gentle undulations are continuously formed over the entire surface 34a of the main coating layer 34.

The liquid fine particles 3 exhibiting such an operation and effect
As the raw material of No. 6, oily additives such as silicone oil, mineral oil, polybutene oil, polyolefin oil, and polyparaffin oil can be suitably used. For example, when the insulating substrate 14 is made of a PET film and the liquid fine particles 36 are made of silicon-based oil, the liquid fine particles 36 take an oval shape long in the thickness direction of the protective film 32 as shown in FIG. Surface 34a of coating layer 34
Then, a wavy ridge is formed around each position of the plurality of liquid fine particles 36.

In the above configuration, the plurality of liquid fine particles 3
Although the size of 6 is not particularly specified, in a manufacturing process of the clear coat plate 30 described later, the raw material of the liquid fine particles 36 is mixed into the molten resin material of the main coating layer 34 and sufficiently stirred, and then automatically set to a predetermined range ( For example, dimensions of the order of several μm are obtained. Further, the arrangement interval of the plurality of liquid fine particles 36 obtained in the same manner is preferably in the range of 0.1 mm to 1.0 mm for the same reason as the solid fine particles 20 of the clear coat plate 10. Further, the thickness of the main coating layer 34 may be within a range capable of exerting a sufficient protective function for the insulating substrate 14 and sufficiently exerting the effect of making the plurality of liquid fine particles 36 non-uniform in interfacial tension, for example, 1 μm.
It can be selected in the range of up to several tens of μm.

The clear coat plate 30 can be manufactured, for example, by the following method. First, a film obtained by mixing the raw material of the liquid fine particles 36 with at least the transparent molten resin material at the time of curing, which is the material of the main coating layer 34, and mixing the liquid fine particles 36 in a desired dispersion state. Prepare materials. The dispersion state of the liquid fine particles 36 at this time is such that the transparency of the protective film 32 formed through the subsequent steps can be sufficiently maintained. In order to obtain such a dispersed state, a desired dispersant is added to the coating material. In addition,
In view of the dimensions and arrangement intervals of the liquid fine particles 36 described above, for example, 0.1 parts by weight for 100 parts by weight of the molten resin material.
What is necessary is just to mix 微粒子 1 part by weight of the liquid fine particles 36.

Next, the coating material is applied to the first surface 1 of the insulating substrate 14.
4a is applied to a uniform desired thickness by, for example, a known roll coating method, bar coating method, or the like. Then, by drying or curing the coating material, the coating material is laminated on the first surface 14a of the insulating substrate 14 to form a plurality of liquid fine particles 36.
Is formed at the above-mentioned arrangement interval to form the transparent main film layer 34 having the above-mentioned thickness. Here, the liquid fine particles 36 have a substantially spherical shape in the initial state of being mixed and stirred in the molten resin material, but as the curing of the coating material progresses, due to the interfacial tension with the insulating substrate 14, the main coating layer 34 is formed. It takes an oval or dish-shaped stable form as shown. Therefore, after the curing is completed, wavy ridges (FIG. 4) or dents (FIG. 5) around the respective positions of the plurality of liquid fine particles 36 are continuously formed on the surface 34a of the main coating layer 34. In this manner, the protective film 32 whose entire thickness continuously changes in a wave-like manner in relation to the positions of the plurality of liquid fine particles 36 is formed on the first surface 14a of the insulating substrate 14, and FIG. The clear coat plate 30 is completed.

Further, a transparent resistive film 17 (FIG. 2) is formed on the second surface 14b of the insulating substrate 14 by using the clear coat plate 30 thus manufactured, so that the structure shown in FIG.
A transparent conductive plate having the same surface shape as that of the transparent conductive plate 12 is completed.

According to the clear coat plate 30 having the above configuration, the surface 3 of the main coating layer 34 can be formed without using solid fine particles.
Smooth undulations are continuously formed over the whole of 4a. As a result, the reflected light on the gently undulating surface 34a of the protective film 32, the protective film 32 and the insulating substrate 14
And the interference with the reflected light on the flat first surface 14a of the insulating substrate 14 is less likely to occur due to the variation in the optical path difference. Is prevented. Moreover, the plurality of liquid fine particles 20 dispersed and arranged in the main coating layer 34 form the protective coating 32.
Has a size and an arrangement interval that can sufficiently maintain the transparency of the clear coat plate 30 itself. Therefore, the object on one side of the clear coat plate 30 can be seen through the clear coat plate 30 from the other side of the clear coat plate 30 clearly, desirably at a level at which the contour and shadow of the object can be accurately recognized. It will be understood that the transparent conductive plate having the clear coat plate 30 has the same operation and effect as the above-described transparent conductive plate 12.

FIG. 6 is a sectional view showing a main part of a panel type input device 40 according to an embodiment of the present invention having the above-described transparent conductive plate 12. The panel-type input device 40 includes a personal computer, a word processor, an electronic organizer, and the like.
In a digital data processing device provided with a display, it can be suitably installed on a display screen such as an LCD (Liquid Crystal Display), a PDP (Plasma Panel), or a CRT (CRT).

The panel-type input device 40 includes an insulating substrate 14,
Transparent conductive plate 12 having protective film 16 and resistive film 17
And a transparent conductive plate 46 having a transparent insulating substrate 42 and a transparent resistive film 44 provided on the surface of the insulating substrate 42. The insulating substrate 14 and the resistive film 17 of the transparent conductive plate 12 and the insulating substrate 42 and the resistive film 44 of the transparent conductive plate 46 each have substantially the same rectangular planar shape. The transparent conductive plates 12 and 46 are opposed to each other in a state where the insulating substrates 14 and 42 and the resistive films 17 and 44 are aligned with each other in position and outer shape. It is superimposed and opened.

When the panel-type input device 40 is installed on the display screen, the transparent conductive plate 12 acts as an upper first detecting element pressed by an operator, and the transparent conductive plate 46 is disposed adjacent to the display screen. And acts as a lower second detection element. Therefore, the transparent conductive plate 46
The insulating substrate 42 is formed from a hard material such as glass. Between the transparent conductive plate 12 and the transparent conductive plate 46,
Numerous dot-like spacers 48 for maintaining the interval between them
Is arranged. In the illustrated embodiment, the spacers 48 are uniformly distributed on the surface of the resistive film 44 of the transparent conductive plate 46. The spacers 48 suppress the deformation of the transparent conductive plate 12 due to at least its own weight and maintain the space between the conductive plates 12 and 46, while when the transparent conductive plate 12 is deformed under the pressing force, the two resistive films at the pressed position are formed. 17 and 44 short circuits are allowed.

As shown in the schematic circuit diagram of FIG. 7, the transparent conductive plates 12 are arranged on the outer edges of the resistive film 17 along the opposite short sides 17a, respectively, and are electrically connected to the resistive film 17. It comprises a pair of parallel first electrodes 50, ie an electrode pair 50. Similarly, the transparent conductive plate 46 is provided on the opposite long side 4 of the resistance film 44.
There is provided a pair of parallel second electrodes 52, that is, electrode pairs 52, which are respectively disposed at the outer edges along 4 a and are electrically connected to the resistance film 44. When the two transparent conductive plates 12 and 46 are overlapped, the respective electrode pairs 50 and 52 are arranged at positions different from each other by 90 degrees. In this state, both transparent conductive plates 1
2, 46 are fixed to each other via an adhesive layer 54 (FIG. 6) such as a double-sided adhesive tape disposed along their outer peripheral edges.

The panel-type input device 40 can input coordinate data by an operator's pressing operation in the same manner as a conventional general panel-type input device. That is, a predetermined voltage is alternately applied between the electrode pairs 50 and 52 from an external power supply circuit to the resistive films 17 and 44 of the transparent conductive plates 12 and 46. In this state, when a desired position on the surface of the protective film 16 of the upper transparent conductive plate 12 is pressed with, for example, a pen 56,
The two resistive films 17 and 44 are short-circuited to each other at the pressed portion, and the partial pressure corresponding to the pressed portion, that is, the short-circuited position is measured on the resistive films 17 and 44 to which no voltage is applied. Double resistance film 1
By measuring the partial pressures alternately generated in this way in 7 and 44, the two-dimensional coordinates of the pressed part are specified in an analog manner in two axial directions, converted into a digital coordinate data signal by a data processing device, and subjected to input processing. Is done.

According to the panel-type input device 40 having the above configuration, since the transparent conductive plate 10 is used as the upper first detection element pressed by the operator, damage to the conductive plate surface due to the pressing operation by the operator can be prevented. Despite having the transparent protective film 16 for prevention, the occurrence of interference fringes on the transparent conductive plate 10 alone is prevented beforehand. In addition, since the transparency inherent in the transparent conductive plate 10 does not deteriorate as described above, the transparency of the panel-type input device 40 can be maintained, and as a result, clear see-through without deteriorating the image quality of the display becomes possible.

[0052]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to further clarify the operation and effect of the present invention, some preferred embodiments will be described. [Example 1] A clear coat plate 10 having the following configuration
(FIG. 1) was produced. 4 parts by weight of silica powder having a particle size distribution of 10 μm to 50 μm (raw material of solid fine particles 20)
And 100 parts by weight of an ultraviolet curable acrylic resin (a mixture of an acrylic polymer and an acrylic monomer) (the first layer 2).
2) and a desired amount of a dispersant, and uniformly dispersed silica powder with a homogenizer to prepare a liquid first coating material. This first coating material was applied to the surface of a PET film (insulating substrate 14) having a thickness of 175 mm, and was cured by ultraviolet light. After the curing is completed, the first layer 22
The thickness of the portion not overlapping the solid fine particles 20 was about 4 μm. In addition, the number of the solid fine particles 20 is 10 per 1 mm ^2.
20 solid fine particles having a density of 15
Is 0.3 mm to 1.2 mm, and a number of local bumps are formed on the surface of the first layer 22 accordingly.

Next, a second coating material (a raw material of the second layer 24) made of an ultraviolet-curable acrylic resin (a mixture of an acrylic polymer and an acrylic monomer) is applied on the first layer 22, and is cured by ultraviolet light. I let it. After curing is completed, the second layer 24
Of the portion that does not overlap the solid fine particles 20 is about 10
μm. The second coating material is used for the first coating in the coating process.
After covering the local protrusions on the surface of the layer 22 and completing the curing of the second coating material, wavy protrusions are continuously formed on the surface 24a of the second layer 24 around the positions of the plurality of solid fine particles 20. Was done. In this state, the solid fine particles 20 were hardly visible.

When the clear coat plate 10 thus manufactured was placed under a fluorescent lamp and visually observed, no interference fringes were generated on the surface of the protective film 16 even when the light of the fluorescent lamp was reflected. The effect of preventing interference fringes was remarkable.

Comparative Example Only the above-mentioned second coating material was applied to the surface of the above PET film and cured to form a clear coat plate of a conventional structure having a coating having a thickness of about 10 μm. When this clear coat plate was placed under a fluorescent lamp and visually observed, iridescent interference fringes were clearly generated on the surface of the coating due to the reflection of light from the fluorescent lamp.

Example 2 A clear coat plate 30 (FIG. 4) having the following configuration was manufactured. Add silicone oil to 0.
5 parts by weight (raw material of the liquid fine particles 36), 100 parts by weight of an ultraviolet curable acrylic resin (mixture of acrylic polymer and acrylic monomer) (raw material of the main coating layer 34) and a desired amount of a dispersant Then, the mixture was sufficiently stirred to produce a liquid film material. This coating material is applied to the surface of a PET film (insulating substrate 14) having a thickness of 175 mm,
UV cured. The coating thickness was about 15 μm. As the curing of the coating material progresses, the liquid fine particles 36 take an oval stable shape long in the thickness direction in the main coating layer 34 due to the interfacial tension with the insulating substrate 14, and after the completion of the curing, the main coating layer 34 A plurality of liquid fine particles 3 are provided on the surface 34a.
6. Wavy ridges centered on each position of 0.2 to 0.5 mm
It was formed continuously at an arrangement interval of mm. In this state, the liquid fine particles 36 were hardly visible.

When the clear coat plate 30 thus manufactured was placed under a fluorescent lamp and visually observed, no interference fringes were generated on the surface of the protective film 32 even when the light of the fluorescent lamp was reflected. The effect of preventing interference fringes was remarkable.

Example 3 A panel-type input device 40 (FIG. 6) having the following configuration was manufactured. Using the clear coat plate 10 prepared in Example 1, the P on the opposite side of the protective film 16 was used.
On the back surface of the ET film (insulating substrate 14), a resistive film 17 made of ITO was formed to a thickness of about 200 ° to form a transparent conductive plate 12. The surface resistance value of the resistance film 17 of the transparent conductive plate 12 was about 300 Ω / m ² . On the other hand, 1.1
mm thick soda lime glass (insulating substrate 42)
A resistive film 44 made of ITO was formed to a thickness of about 100.degree. The surface resistance of the resistance film 44 of the transparent conductive plate 46 is about 500 Ω / m ^2.
Met.

A large number of spacers 48 are formed on the resistive film 44 of the transparent conductive plate 46 by a printing process, and electrode pairs 50 and 52 are formed on the surfaces of the transparent conductive plates 12 and 46 having the resistive films 17 and 44. Was formed by a printing process and dried and cured. Then, the resistance films 17 and 4
The two transparent conductive plates 12 and 46 were overlapped with each other so as to face each other, and were fixed to each other via a double-sided tape (adhesive layer 54). Further, a lead wire (not shown) was connected to the conductive pattern to complete the panel-type input device 40.

The panel-type input device 40 manufactured as described above was placed on a color LCD, and the quality of the LCD image transmitted and displayed was observed. It was visually recognized at a recognizable level. Further, when the panel-type input device 40 was placed under a fluorescent lamp and visually observed, the protective film 3 was reflected even when the light of the fluorescent lamp was reflected.
No interference fringes were generated on the surface of Sample No. 2, and the image visibility was not affected at all. Further, the panel-type input device 40
A test was conducted to write katakana characters on the transparent conductive plate 12 on the input operation side under a pressure of 300 g with an input pen having a tip (curvature radius: 0.8 mm) made of polyacetal, and after writing 200,000 characters Also, no damage occurred on the surface 24a of the protective film 16 of the transparent conductive plate 12.

[0061]

As is apparent from the above description, according to the present invention, a clear coat plate having a transparent substrate and a transparent film formed on one surface of the substrate has a clear coat plate itself. The occurrence of interference fringes in the clear coat plate alone can be prevented without deteriorating the inherent transparency. Therefore, if a transparent conductive plate and a panel-type input device provided with the transparent conductive plate are manufactured using such a clear coat plate having excellent visibility, image quality of a display equipped with the panel-type input device is deteriorated. Without this, extremely clear image see-through without interference fringes becomes possible.

[Brief description of the drawings]

FIG. 1 is a partially enlarged cross-sectional view of a clear coat plate according to a first embodiment of the present invention.

FIG. 2 is a partially enlarged cross-sectional view of a transparent conductive plate according to an embodiment of the present invention.

FIG. 3 is a partially enlarged sectional view of a semi-finished product of the clear coat plate of FIG. 1;

FIG. 4 is a partially enlarged cross-sectional view of a clear coat plate according to a second embodiment of the present invention.

FIG. 5 is a partially enlarged sectional view showing a modification of the clear coat plate of FIG.

FIG. 6 is a partially enlarged cross-sectional view illustrating a main part of a panel-type input device according to an embodiment of the present invention including the transparent conductive plate of FIG. 2;

FIG. 7 is a diagram schematically illustrating a signal circuit of the panel-type input device of FIG. 6;

[Explanation of symbols]

 10, 30 ... clear coat plate 12, 46 ... transparent conductive plate 14, 42 ... insulating substrate 16, 32 ... protective film 17, 44 ... resistive film 18, 34 ... main film layer 20 ... solid fine particles 22 ... first layer 24 ... Second layer 36 ... Liquid fine particles 40 ... Panel type input device 48 ... Spacer 50, 52 ... Electrode pair

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C09D 161/20 C09D 161/20 169/00 169/00 183/04 183/04 G02B 1/10 G06F 3 / 033 360A G06F 3/033 360 360H G02B 1 / 10Z F term (reference) 2H042 BA02 BA03 BA12 BA15 BA16 2K009 AA12 CC03 CC23 CC24 CC34 CC42 4F100 AA07B AA08B AA19B AA20B AA21B AA01BAKB AK AK AK BA03 BA07 BA10A BA10C CA04B DD12B DD12C DE01B EH46 GB41 JB13B JG04A JN01 JN01A JN01B JN01C JN30 YY00B YY00C 4J038 CB022 CB082 CC032 CG141 CG142 DA141 HA142 HA21 HA141 HA03 HA03A 326 BC22 BC33 CC02 CC03 CC05 CC15 CC37

Claims (17)

[Claims] 1. A clear coat plate comprising a transparent substrate and a transparent film formed on one surface of the substrate, wherein the film maintains a transparent main film layer and transparency of the film. A clear coat plate comprising a plurality of fine substances dispersed in the main coating layer, wherein the thickness of the coating fluctuates in a wavy manner in relation to the positions of the fine substances. 2. The clear coat plate according to claim 1, wherein the plurality of fine substances are composed of a plurality of solid fine particles having a particle size and an arrangement interval capable of maintaining the transparency of the film. 3. A transparent first layer, wherein the main coating layer of the coating contains the plurality of solid fine particles and is laminated on the surface of the substrate, and a transparent layer laminated on the first layer. The second
3. The clear coat plate according to claim 2, wherein a surface of the second layer opposite to the first layer is wavyly raised around the positions of the plurality of solid fine particles. 4. 4. The clear coat plate according to claim 3, wherein the first layer has a thickness of 1 μm to 10 μm. 5. The clear coat plate according to claim 3, wherein the second layer has a thickness of 3 μm to 30 μm. 6. The solid fine particles having a particle size of 10 μm to 50 μm.
The clear coat plate according to any one of claims 2 to 5, which is in a range of µm. 7. A powdery material in which the solid fine particles are selected from silica, glass beads, alumina, titanium oxide, zinc oxide, magnesium oxide, calcium carbonate, barium sulfate, polyethylene, polypropylene, polystyrene, urea resin and acrylic resin. Claim 2 formed from
7. The clear coat plate according to any one of 6. 8. The clear coat plate according to claim 1, wherein the plurality of fine substances are composed of a plurality of liquid fine particles for making the interfacial tension between the film and the substrate non-uniform. 9. The method according to claim 9, wherein the liquid fine particles are silicone oil,
The clear coat board according to claim 8, wherein the clear coat board is formed from an oily additive selected from mineral oil, polybutene oil, polyolefin-based oil, and polyparaffin-based oil. 10. The method according to claim 1, wherein the plurality of minute substances have a size of 0.1 mm to 0.1 mm.
The clear coat plate according to any one of claims 1 to 9, wherein the clear coat plate is dispersed in the main coating layer at an interval of 1.0 mm. 11. The main coating layer of the coating is selected from a thermosetting acrylic resin, an ultraviolet curing acrylic resin, a silicone resin, a polyester resin, a polycarbonate resin, a melamine resin, a urea resin and a thermosetting methacryl resin. The clear coat board according to any one of claims 1 to 10, which is formed from a resin material. 12. A method for producing a clear coat plate comprising a transparent substrate and a transparent film formed on one surface of the substrate, wherein a plurality of fine substances are added to at least a transparent molten resin at the time of curing. Prepare a coating material mixed in a dispersed state, apply the coating material to the surface of the substrate, cure the coating material, and fluctuate the thickness in a wavy manner in relation to the positions of the plurality of minute substances. Forming the film,
A method for producing a clear coated plate. 13. The method for producing a clear coat plate according to claim 12, wherein the plurality of fine substances comprise a plurality of solid fine particles having a particle size and an arrangement interval capable of maintaining the transparency of the film. 14. After the coating material is cured to form a first layer, a second coating material made of a transparent molten resin is applied on at least the first layer and cured to form a second layer. 14. The layer of claim 13, wherein the surface of the second layer opposite the first layer forms a coating that is wavyly raised about the positions of the plurality of solid particulates. Production method of clear coat plate. 15. The method according to claim 12, wherein the plurality of fine substances are composed of a plurality of liquid fine particles for making the interfacial tension between the film and the substrate non-uniform. 16. A transparent insulating substrate and a first insulating substrate.
A transparent conductive plate, comprising: a clear coat plate having a transparent protective film formed on a surface thereof; and a transparent resistive film formed on a second surface of the insulating substrate opposite to the first surface. A transparent conductive plate, wherein the coated plate comprises the clear coated plate according to any one of claims 1 to 11. 17. Each of the resistive films includes a transparent insulating substrate, a transparent resistive film provided on a surface of the insulating substrate, and an electrode pair connected to the resistive film and formed on the insulating substrate. And a pair of transparent conductive plates disposed so as to face each other, and disposed between the transparent conductive plates, separating the resistive films from each other and allowing a short circuit between the resistive films when at least one of the insulating substrates is deformed. A panel-type input device comprising a spacer, wherein one of the transparent conductive plates is made of the transparent conductive plate according to claim 16.