JPH06309990A - Touch panel for pen entry - Google Patents

Abstract

PURPOSE:To provide a touch panel for pen entry which excels in the anti- abrasiveness for an entry pen and presents a fine taste of writing. CONSTITUTION:A pair of panel plates PA, PB having electroconductive thin films Da, Db are installed in such an arrangement that the thin films are opposed to each other while a spacer S is interposed, and thereby a touch panel for pen entry in the resistance film system is formed, wherein the panel plate PA on the side to be touched by an entry pen M is structured so that a transparent base material 3 fitted with a conductive thin film is affixed to another transparent base material 1 fitted with a surface processing layer where a transparent sticky attaching agent layer 2 is interposed. The pencil hardness of the surface is made over 2H, while the dynamic coefficient of friction for the entry pen M ranges between 0.02-0.30, and further such an elastic deforming property should be provided, that the entry pen M which is touched with a load of 300g sinks to the depth 20 to 100mum to return to the original condition when the load is removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pen input touch panel used as a transparent switch structure for various displays.

[0002]

2. Description of the Related Art In recent years, a transparent switch that allows a display screen to be seen through is becoming a mainstream analog type in which a digital type is used to input with a pen. For example, an application from an electronic notebook to a portable multimedia device is also announced. It is believed that the number will increase rapidly in the future.

As a pen input touch panel used in these devices, a pair of panel plates having a conductive thin film are generally arranged so as to face each other with a spacer interposed therebetween, and one of them is disposed. There is a mainstream of a resistance film type in which an input pen is brought into contact with the panel plate and an electromagnetic induction type in which an electromagnetic pen is used as the input pen to bring it into contact with the surface of the panel plate.

[0004]

In both types, however, the panel plate for contacting the input pen is made of a polyethylene terephthalate plate with a hard coat layer or an acrylic plate in consideration of scratch resistance to the pen. Moreover, since it is made of a relatively hard material such as a glass plate, it is difficult to write unlike writing on paper and there is a problem in terms of writing quality.

In view of the above conventional problems, the present invention provides a resistive film type or electromagnetic induction type pen input touch panel which is excellent in scratch resistance against an input pen and has a good writing quality. It is an object.

[0006]

In order to achieve the above-mentioned object, the inventors of the present invention have conducted extensive studies and as a result, have specified that a panel plate with which an input pen is to be contacted has a specific pencil hardness and a specific dynamic friction coefficient. It was found that a touch panel for pen input, which is excellent in both scratch resistance against an input pen and writing quality, can be obtained when it is made of a material having elastic deformability as described above, and thus completed the present invention.

That is, according to the present invention, the surface has a pencil hardness of 2H or more and a dynamic friction coefficient of 0.02 to the input pen.
It is equipped with a transparent panel plate of 0.30, and when this panel plate is brought into contact with the input pen with a load of 300 g, it is 20 to 10
The present invention relates to a touch panel for pen input, which is elastically deformable such that it sinks to a depth of 0 μm and returns to its original state when a load is removed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a conductive thin film D (Da, Db) as an example of a touch panel for pen input of the present invention.
A pair of panel plates P (PA, PB) having
FIG. 2 shows a resistive film type pen input touch panel in which a and Db are opposed to each other with a spacer S and an adhering reinforcing material H in between, and is a panel plate PA on the side where the input pen M contacts. However, the transparent base material 1 with a surface treatment layer and the transparent base material 3 with a conductive thin film are bonded to each other via the transparent adhesive layer 2.

The transparent substrate 1 with a surface treatment layer is a substrate body 1
No. 0 is provided with the surface treatment layer 11, and the surface treatment layer 1
1, the pencil hardness of the surface of the panel board PA is 2H or more,
It is preferably 3H or more, and the dynamic friction coefficient with respect to the input pen M is 0.02 to 0.30, preferably 0.05 to 0.
It is set to 15. When the pencil hardness is less than 2H,
Scratch resistance to the input pen M is insufficient. When the dynamic friction coefficient is less than 0.02, the above-mentioned pen is too slippery, while when it exceeds 0.30, the above-mentioned pen is not smooth and becomes heavy, and it is difficult to write any of them.

In such a transparent substrate 1 with a surface treatment layer, the substrate body 10 usually has a thickness of 50 to 200 μm.
Use a transparent resin film of a certain degree
It is preferable that 1 is provided with a hard coat layer.

In the resin film with a hard coat layer, the material of the hard coat layer is a thermosetting polysiloxane, an ultraviolet curable unsaturated polyester, an unsaturated acrylic resin, an unsaturated polyurethane, a polyamide. and so on. The hard coat layer may be a clear type or an anti-glare type in which micro silica, calcium carbonate or the like is dispersed.

Further, as the material of the resin film, polyester such as polyethylene terephthalate, polycarbonate
Bonnet, polymethylmethacrylate, polystyrene,
Examples include acrylonitrile-styrene-butadiene copolymer, polyvinyl chloride, polyethylene, polypropylene, polyamide, cellulose acetate, polyimide, polysulfone, and polyethersulfone.

The transparent pressure-sensitive adhesive layer 2 is for bonding the transparent substrate 1 with a conductive thin film to the above-mentioned transparent substrate 1 with a surface treatment layer. By interposing the agent layer 2, the scratch resistance of the panel plate PA is improved by its cushioning effect, and at the same time, the panel plate PA is provided with an appropriate elastic deformation property, so that the writing feeling with the input pen M is extremely high. To be good.

The above-mentioned appropriate elastic deformability means that the input pen M
When contacted with a load of 300 g,
It means the property that when the load sinks to a depth of 100 μm and the load is removed, the original state is quickly restored. When the depth of the subduction is less than 20 μm, the writing feels like writing on a hard plate and the writing is uncomfortable. On the other hand, when it exceeds 100 μm, the subduction becomes too deep and it becomes difficult to write. Also, if the load is not restored to the original state, repeated writing on the same portion becomes impossible.

The material of the input pen M is a polyacetator.
Resin is mainly used, the pen tip has a radius of 0.8 mm
It is of a degree. For such an input pen M, a good writing quality can be obtained by sinking in the above specific range. This is because when writing characters on paper with a pole pen, etc., it is better on the desk mat than when writing on a hard desk. It is thought that the same effect as writing on paper with a better writing feel is the same.

When the transparent substrate 1 with a surface treatment layer is directly provided with the conductive thin film Da so that the transparent pressure-sensitive adhesive layer 2 is not interposed, the material and thickness of the surface treatment layer can be selected. However, it is difficult to obtain the appropriate elastic deformability as described above, and the writing feeling with the input pen M is inevitably deteriorated.

The thickness of the transparent pressure-sensitive adhesive layer 2 is important for obtaining the above-mentioned effects, and is usually in the range of 20 to 100 μm and is appropriately selected depending on the material constitution of the transparent substrate 1 with a surface treatment layer. It is better to choose the thickness of Examples of the pressure-sensitive adhesive include an acrylic pressure-sensitive adhesive and a rubber-based pressure-sensitive adhesive, and it is particularly preferable to use the acrylic pressure-sensitive adhesive from the viewpoint of transparency. These adhesives may contain an adhesive polymer component, a plasticizer, a tackifying component, etc., but additives that may impair transparency may be avoided. Is preferable.

As the adhesive polymer which is the main component of the acrylic adhesive, the alkyl group such as 2-ethylhexyl acrylate, butyl acrylate, isooctyl acrylate, butyl methacrylate and propyl methacrylate has 1 to 10 carbon atoms. Monomer containing 10 (meth) acrylic acid alkyl ester and a functional group-containing unsaturated monomer such as acrylic acid, methacrylic acid, maleic acid, fumaric acid, hydroxyethyl acrylate or hydroxyethyl methacrylate as main components Those obtained by copolymerizing a body mixture are preferably used. As the adhesive polymer which is the main component of the rubber-based adhesive, styrene-butadiene random copolymer, styrene-isoprene block copolymer,
Natural rubber or the like is preferably used.

The transparent base material 3 with the conductive thin film is the base material body 3
0 is a relatively thin resin film having a thickness of usually about 6 to 75 μm and is provided with a conductive thin film Da. The material of the resin film is a transparent substrate with a surface treatment layer. The material is the same as that of the resin film used for the material 1.

The conductive thin film Da is made of In, Sn, Au, A
Metals such as 1, Cu, Pt, Pd, Ag, and Rh, indium oxide, tin oxide, and composite oxides of these (hereinafter, I
A transparent thin film made of a metal oxide such as (TO) and having conductivity, which is formed by a method such as vacuum deposition, sputtering, and ion plating. The thickness is usually several tens to 1,000 Å, preferably 100 to 5
00Å, light transmittance is usually 50% or more, preferably 70
% Or more.

Panel plate PA on the side where the input pen M contacts
On the other hand, the panel board PB arranged to face each other with the spacer S and the adhesive reinforcing material H interposed therebetween is generally made of a glass plate, an acrylic plate, a transparent epoxy plate or the like and usually has a thickness of 0.5 to
The conductive thin film Db is formed on the transparent hard base material 4 of about 2 mm. The material configuration, thickness, forming method, etc. of the conductive thin film Db are the same as those of the conductive thin film Da.

In the resistance film type touch panel for pen input constructed as described above, the input pen M is brought into contact with the transparent base material 1 with the surface treatment layer of the panel plate PA with a load of about 300 g to make the touch panel suitable. A good writing feeling can be obtained by the subduction, and the electric connection between the thin films Da and Db and the input / output operation by the disconnection can be easily performed, and the repeated use can be favorably performed. Moreover, since the surface treatment layer 11 of the base material 1 has excellent scratch resistance, it exhibits good durability even after repeated use.

FIG. 2 shows, as another example of the pen input touch panel of the present invention, an electromagnetic induction type pen input touch panel in which an electromagnetic pen Md is used as the input pen M, and the electromagnetic pen Md is brought into contact with the touch panel. The plate PC has a structure in which a transparent hard substrate 7 is attached to a transparent substrate 5 with a surface treatment layer via a transparent adhesive layer 6.

The transparent substrate 5 with the surface treatment layer is the substrate body 5
The surface-treated layer 51 is formed on the surface of the transparent substrate 5, the transparent substrate 5 with the surface-treated layer, the transparent pressure-sensitive adhesive layer 6, and the transparent hard substrate 7.
Are the same as the transparent base material 1 with the surface treatment layer, the transparent pressure-sensitive adhesive layer 2 and the transparent hard base material 4 in the resistive film type pen input touch panel shown in FIG. 1, respectively. The surface of the PC has a pencil hardness of 2H or more and a dynamic friction coefficient of 0.02 to 0.
The electromagnetic pen M is set to 30 and the load is 300 g.
When d is brought into contact, it sinks to a depth of 20 to 100 μm and returns to its original state when the load is removed.

In such an electromagnetic induction type touch panel for pen input, as in the case of the resistive film type touch panel, the transparent substrate 5 with the surface treatment layer of the panel plate PC is used.
By bringing the electromagnetic pen Md into contact with the above, a good writing quality can be obtained, and a good input / output operation to a conductive path (not shown) via the panel board PC can be performed, and the base material 5 can be used.
Good durability based on excellent scratch resistance can be obtained.

[0026]

As described above, according to the present invention, the panel plate with which the input pen is brought into contact is made of a material having a specific pencil hardness and a dynamic friction coefficient and a specific elastic deformability. It is possible to provide a touch panel for pen input, which has excellent scratch resistance against the input pen and excellent writing quality.

[0027]

EXAMPLES Next, examples of the present invention will be described to explain more specifically.

Example 1 A polyethylene terephthalate film (hereinafter referred to as PET film) having a thickness of 25 μm was used as a substrate body,
A transparent ITO thin film having a thickness of about 250 Å was formed on one surface of this main body by a DC magnetron sputtering method to obtain a transparent substrate with a conductive thin film.

As a transparent substrate with a surface treatment layer, DIAHARD EX-200 manufactured by Reiko Co., Ltd. was used. This uses a PET film having a thickness of 125 μm as the substrate body,
The surface treatment layer is formed by coating a polysiloxane-based thermosetting hard coat material to a thickness of 2 μm on one surface of the main body.

On the PET film side of this transparent substrate with a surface-treated layer, an acrylic transparent pressure-sensitive adhesive layer containing 40 parts by weight of a copolymer of 100 parts by weight of 2-ethylhexyl acrylate and 10 parts by weight of acrylic acid as a main component. Of the transparent base material with the conductive thin film formed on the surface of the pressure-sensitive adhesive layer.
The film side was stuck together to form an upper panel plate.

Separately from this, as a lower panel plate having a conductive thin film, a glass plate with an ITO thin film manufactured by Nippon Sheet Glass Co., Ltd. (a glass plate with a thickness of 1 mm, which is a transparent hard base material, has a thickness on one side). 150 Å ITO thin film is formed), and UV curable ink [Seiko Advance Co., Ltd. # 9051] is applied to the side having the conductive thin film by 1 mm pitch by silk screen printing method. Diameter 0.08
It was printed in the form of small projections of mm and exposed and cured by an ultraviolet irradiation device to form a spacer.

A lower panel plate on which this spacer is formed,
The above-mentioned upper panel plate is arranged so that the conductive thin films face each other, and only the four corners are bonded to each other with a bonding reinforcing material composed of a double-sided adhesive tape having a thickness of 100 μm.
A resistive film type pen input touch panel having the structure shown in FIG. 1 was produced.

Comparative Example 1 A transparent substrate with a surface treatment layer [DIAHARD EX-200 manufactured by Reiko Co., Ltd.] used in Example 1 was formed on the PET film side by a DC magnetron sputtering method. About 2
A 50Å transparent ITO thin film was directly formed as an upper panel plate. A resistive film type pen input touch panel was produced in the same manner as in Example 1 except that this upper panel plate was used.

Comparative Example 2 Example 1 was repeated, except that a 0.2 mm-thick glass plate was used in place of the transparent substrate with surface treatment layer [DIAHARD EX-200 manufactured by Reiko Co., Ltd.]. In exactly the same manner, a resistive film type touch panel for pen input was produced.

Regarding the pen input touch panels of Example 1 and Comparative Examples 1 and 2 above, the pencil hardness of the upper panel plate surface, the coefficient of dynamic friction with respect to the input pen and the elastic deformability, and the writing and scratch resistance of the input pen. The sex was examined by the following method. The results are shown in Table 1 below.

<Pencil Hardness> The pencil hardness was measured according to JIS K 5400.

<Dynamic Friction Coefficient> Using a Haydon surface property measuring instrument (TYPE: HEIDON-14D) manufactured by Shinto Kagaku Co., Ltd., Hyper Electronic Notebook DB-Z Touch Pen (material: Polyaceta) manufactured by Sharp Co., Ltd. Resin, nib: radius 0.
8 mm) as an input pen, and the dynamic friction coefficient was measured under the conditions of a relative moving speed of the input pen and the surface of the panel plate of 1,000 mm / min and a load of the pen of 500 g.

<Elastic Deformability> The same input pen used for measuring the coefficient of dynamic friction was applied to the surface of the panel plate with and without a glass plate of a predetermined thickness interposed between them by a load of 3
The depth of sinking when touched with 00g is read with a dial gauge connected to the upper part of the pen, and when reading through the glass plate is X ₁ , and when not, it is X _2. Depth Y = (X ₂ −X ₁ −thickness of glass plate). When the above load is removed,
It was evaluated whether or not it returned to the original state within 2 seconds, and when it returned, it was evaluated as good recoverability, and when it did not return, it was evaluated as poor recovery.

<Writing quality> When the writing feeling is actually written on the surface of the panel board by using the same input pen as that used for measuring the coefficient of dynamic friction, a good writing quality as if writing on paper is obtained. Was evaluated as ○, and when it was hard to write because it felt or slipped, it was evaluated as Δ, and when it was very difficult to write, it was evaluated as ×.

<Scratch resistance> After performing a writing test 10,000 times on the same portion of the panel plate surface with the same input pen used for measuring the dynamic friction coefficient, the surface was visually observed, The sample was evaluated as ◯ when it was not damaged, as Δ when it was slightly damaged, and as × when the hard coat layer was peeled off.

[0041]

[Table 1]

As is clear from the results shown in Table 1 above, the pen input touch panel of Example 1 of the present invention is significantly better in writing than the pen input touch panels of Comparative Examples 1 and 2. Moreover, it can be seen that it also has good scratch resistance.

Example 2 As a transparent substrate with a surface treatment layer, A manufactured by Nitto Denko Corporation was used.
630-80T was used. This uses a 80 μm thick triacetate film as the main body of the substrate, and a 3 μm thick acrylic hard coat layer with silica dispersed as a surface treatment layer on one side of the main body. Is.

A glass plate having a thickness of 2 mm was used as a transparent hard substrate, and the same acrylic pressure-sensitive adhesive layer used in Example 1 was formed on one side of the glass plate to a thickness of 50 μm. Then, on the surface of the pressure-sensitive adhesive layer, the transparent substrate with the above-mentioned surface treatment layer, so that the triacetate film is on the inside,
The substrates were attached to each other to prepare an electromagnetic induction type touch panel for pen input having a structure shown in FIG.

With respect to the touch panel for pen input, the pencil hardness on the surface treatment layer side, the coefficient of dynamic friction with respect to the input pen and the elastic deformability, and the writing quality and scratch resistance with the input pen were examined in the same manner as described above. As a result, the pencil hardness was 3H, the dynamic friction coefficient was 0.04, the elastic deformation was 30 mm in the depth of depression, and the recovery was good. In addition, the writing quality and the scratch resistance were evaluated as ◯, and the same favorable results as those of the touch panel of Example 1 were obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a resistive film type pen input touch panel of the present invention.

FIG. 2 is a cross-sectional view showing an electromagnetic induction type pen input touch panel of the present invention.

[Explanation of symbols]

 P (PA, PB, PC) Panel plate D (Da, Db) Conductive thin film S Spacer M Input pen Md Electromagnetic pen 1,5 Transparent base material with surface treatment layer 2,6 Transparent adhesive layer 3 Conductive thin film Transparent base material 7 Transparent hard base material

Claims (3)

[Claims] 1. A transparent panel plate having a pencil hardness of 2H or more on the surface and a dynamic friction coefficient of 0.02 to 0.30 with respect to the input pen, which panel plate is brought into contact with the input pen under a load of 300 g. A pen input touch panel having elastic deformability that sinks to a depth of 20 to 100 μm and returns to its original state when the load is removed. 2. A resistive film type touch panel for pen input, wherein a pair of panel plates having a conductive thin film are arranged so as to face each other with a spacer interposed therebetween so that the input pens come into contact with each other. The panel plate on the side to be made has a structure in which a transparent base material with a conductive thin film is attached to a transparent base material with a surface treatment layer via a transparent adhesive layer, which has a pencil hardness and an input pen according to claim 1. Touch panel for pen input having dynamic friction coefficient and elastic deformability with respect to. 3. A touch panel for inputting an electromagnetic induction type pen using an electromagnetic pen as an input pen, wherein a panel plate to be brought into contact with the electromagnetic pen is a transparent hard material with a transparent adhesive layer on a transparent base material with a surface treatment layer. A pen input touch panel having a pencil hardness, a dynamic friction coefficient with respect to an input pen, and elastic deformability according to claim 1, which has a structure in which base materials are bonded together.