JPH07244552A - Surface material of tablet for pen input computer - Google Patents

Abstract

PURPOSE:To obtain writing characteristics with a sense of proper resistance like writing on a paper surface by a normal pen by setting up ten-point average roughness on the surface of an ionizing radiation hardening type resin layer and the average interval of surface ruggedness in respective specific ranges. CONSTITUTION:The surface material has a base material 1 consisting of a transparent plastic film and an ionizing radiation hardening type resin layer 2 formed on the surface of the material 1, the ten-point roughness on the surface of the layer 2 is set up to 0.5 to 50mum and the average interval of surface ruggedness is 50 to 500mum. A polyethylene terephtalate film, an acrylic film, a cellulose triacetate film, etc., which are treated by easy adhering processing are appropriate for the base material 1 consisting of the transparent plastic film. At the time of executing writing operation by a pen for an input computer provided with a pen tip made of plastic such as polyacetal, a sense of resistance like writing on normal paper by a pen can be obtained and an excellent characteristic in a sense of pen input can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tablet surface material used in a computer using an operating system dedicated to pen input.

[0002]

2. Description of the Related Art A computer using a pen-input-only operating system basically has a liquid crystal panel and a digitizer, which is a coordinate detection device, integrated with each other.
It is possible to perform computer operation as if you were writing a letter on the liquid crystal panel with a pen.

As a surface material of a display that also serves as an input portion in a computer using a pen input-only operating system, that is, as a surface material of a tablet for a pen input computer, conventionally, (1) a glass plate not subjected to surface treatment, (2) ) An etched glass plate, (3) a plastic plate with a hard coat layer formed on the surface,
(4) A plastic film having a hard coat layer attached to the surface of a glass plate or a plastic plate is used.

[0004]

(1) and (3) of the surface materials of the above-mentioned conventional tablet for pen input computer.
Both of (4) and (4) have a smooth surface or very few irregularities on the surface, so the writing suitability when writing characters on the liquid crystal panel with a pen for a pen input computer is poor. , There is a sense of incompatibility compared to writing on a normal paper with a pen, and operating a pen for a pen input computer equipped with a plastic nib such as polyacetal It was far from the feeling of writing with a pen.

Further, the glass plate subjected to the etching treatment of (2) has a drawback that the cost increases due to the etching treatment.

On the other hand, the present invention takes advantage of the characteristics of the surface material of a conventional tablet for a pen input computer, such as high detection performance and lightness, and moreover, it is suitable for writing on a paper surface with a normal pen. Provided is a surface material for a tablet for a pen input computer, which provides resistance with writing aptitude and is supplied at low cost.

[0007]

The present invention has a base material made of a transparent plastic film and an ionizing radiation curable resin layer formed on the surface of the base material. A tablet for pen input computer, wherein the ten-point average roughness (Rz) of the surface of the resin layer is 0.5 to 5.0 μm, and the average interval (Sm) of the surface irregularities is 50 to 500 μm. Made of surface material.

In the surface material of the tablet for pen input computer according to the present invention having the above-mentioned constitution, as the base material made of the transparent plastic film, for example, polyethylene terephthalate film, acrylic film, cellulose triacetate film, etc. which are easily adhered are suitable. .

For the formation of the ionizing radiation-curable resin layer, those having an acrylate-based functional group, such as polyester resin and polyether resin having a relatively low molecular weight, are preferably used.
Acrylic resin, epoxy resin, urethane resin, alkyd resin, spiro acetal resin, polybutadiene resin,
Polythiol polyene resin, polyfunctional compounds such as polyhydric alcohols, (meth) acrylates such as oligomers or prepolymers, and ethyl (meth) as a reactive diluent.
Acrylate, ethylhexyl (meth) acrylate,
Monofunctional and polyfunctional monomers such as styrene, methylstyrene and N-vinylpyrrolidone, such as trimethylolpropane tri (meth) acrylate, hexanediol (meth) acrylate, tripropylene glycol di (meth) acrylate, diethylene glycol di (meth). Acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth)
Those containing a relatively large amount of acrylate or the like can be used.

The ionizing radiation curable resin layer is formed by coating a coating agent of the above resin with roll coating, curtain flow coating, wire bar coating, reverse coating, gravure coating, gravure reverse coating, air knife coating,
It can be obtained by applying a coating method such as kiss coating, smooth coating or comma coating and irradiating it with ionizing radiation to cure it. The ionizing radiation curable resin layer is formed to have a thickness of about 2 to 10 μm after being cured.

When the coating agent for forming the ionizing radiation-curable resin layer is cured by irradiation with ultraviolet rays, for example, acetophenones, benzophenones, Michler's benzoylbenzoate, α-amylo are contained in the coating agent. A photopolymerization initiator such as oxime ester, tetramethylmeuram monosulfide, thioxanthone and the like, and a photosensitizer optionally added, for example, n
It goes without saying that a photosensitizer such as -butylamine, triethylamine, tri-n-butylphosphine, etc. is mixed.

The ionizing radiation curable resin layer is cured by, for example, ultraviolet irradiation of a light source such as an ultrahigh pressure mercury lamp, a high pressure mercury lamp, a low pressure mercury lamp, a carbon arc, a black light lamp, a metal halide lamp, or a Cockroft-Walton type, 100-1000 Ke by various electron beam accelerators such as handigraph type, resonance transformer type, insulating core transformer type, linear type, dynamitron type, high frequency type
It is performed by irradiation with an electron beam having an energy of V, preferably 100 to 300 KeV.

As a method for forming irregularities on the surface of the ionizing radiation-curable resin layer, a method of dispersing a diffusing agent in a coating agent of the ionizing radiation-curable resin or a coating layer of the ionizing radiation-curable resin before curing is used. There is a method of forming an uneven pattern by using an embossing roll, a shaped film, or the like and then hardening the pattern.

As the diffusing agent to be dispersed in the coating agent of the ionizing radiation-curable resin, those having a particle size of about 1 to 10 μm are suitable, and for example, acrylic resin-based, polycarbonate resin-based, polystyrene-based plastic beads or the like, Inorganic beads such as silica beads are used. The diffusing agent is generally 0.2 to 20 with respect to 100 parts by weight of the resin.
It is compounded in about parts by weight.

Further, in the case of forming a concavo-convex pattern on the coating layer of the ionizing radiation-curable resin, an embossing roll, a shaping film or the like having a concavo-convex degree with which a predetermined surface shape can be obtained is used.

By adding a silicone resin to the ionizing radiation curable resin layer, it is possible to reduce the frictional resistance when writing with a pen tip and to enhance the scratch resistance. The blending amount of the silicone resin at this time is 0.01 to 0.5 wt% of the total amount of the resin and the diffusing agent in consideration of other physical properties of the ionizing radiation-curable resin layer, coating suitability of the coating agent, and the like. % Is preferable.

The shape of the surface of the ionizing radiation curable resin layer is
It can be obtained by enlarging the surface irregularity shape and writing it on a chart using a stylus type surface roughness meter, but the aspect of the roughness curve changes depending on the vertical and horizontal enlargement ratio and the cutoff value. You need to be careful.

The ten-point average roughness (Rz) of the surface of the ionizing radiation-curable resin layer is the surface roughness standard JIS B601-19.
82, the average spacing (Sm) of the irregularities is a vertical value when the center line average roughness (Ra) is less than 0.1 under the condition of a cutoff value of 0.8 mm using a stylus type surface roughness meter. Magnification value 200
The value is 00 times, and 0.1 or more means the average crest interval value when measured at 5000 times. It should be noted that the average crest interval value changes depending on the cutoff value at the time of measurement and the vertical expansion value. When the center line average roughness (Ra) is small, the average mountain interval value becomes very large unless the vertical enlargement value is increased and small irregularities are counted, which is unsuitable for surface roughness evaluation. .

[0019]

The present invention has a base material made of a transparent plastic film and an ionizing radiation-curable resin layer formed on the surface of the base material. The point average roughness (Rz) is 0.5 to 5.0 μm, and the average spacing (Sm) of the irregularities is 50 to 500 μm.
It consists of the surface material of a tablet for pen input computer.

The surface material of the tablet for a pen input computer of the present invention having the above-mentioned structure can be applied to any digitizer of a resistance film type, an electrostatic coupling type and an electromagnetic induction type, and the digitizer is used. In a computer using an operating system exclusively for pen input, the tablet surface has a ten-point average roughness (Rz) of 0.5 to 5.0 μm on the surface of the ionizing radiation curable resin layer.
m, and the average interval (Sm) of the unevenness is 50 to 500
Since it is μm, when you operate a pen for a pen input computer that has a pen tip made of plastic such as polyacetal, you can obtain an appropriate resistance to writing. Therefore, you can write with excellent writing similar to writing on paper with a normal pen. Aptitude is obtained.

Regarding the surface shape of the ionizing radiation-curable resin layer, if the ten-point average roughness (Rz) is less than 0.5 μm, the surface of the ionizing radiation-curable resin layer becomes close to a flat surface, and the average spacing (Sm) between the irregularities. Suitable writing characteristics cannot be obtained regardless of the numerical value of. In addition, the average spacing (Sm) of the unevenness is 500.
Even when the thickness exceeds μm, the surface of the ionizing radiation-curable resin layer becomes nearly flat, and suitable writing characteristics cannot be obtained regardless of the numerical value of the ten-point average roughness (Rz).

When the ten-point average roughness (Rz) of the surface of the ionizing radiation-curable resin layer exceeds 5.0 μm, even if the average interval (Sm) of the irregularities is in the range of 50 to 500 μm, the display as a display is obtained. Optical characteristics such as preferable light transmittance and resolution cannot be satisfied. When the average spacing (Sm) between the concavities and convexities is less than 50 μm, the writing aptitude and the optical characteristics are well balanced, as in the case where (Rz) is less than 0.5 μm and (Rz) exceeds 5.0 μm. Disappear.

[0023]

EXAMPLES The specific constitution of the surface material of the tablet for pen input computer of the present invention will be described below with reference to examples.

Example 1 In [FIG. 1], a substrate (dia foil) made of a transparent polyethylene terephthalate film having a thickness of 125 μm was used.
O-300E) 1 on one side, an ultraviolet curable coating agent comprising 100 parts by weight of an acrylic ultraviolet curable resin, 2 parts by weight of acrylic resin beads having a particle diameter of 5 to 10 μm, and a trace amount of a silicone resin is applied on the roll coater. 6 by law
g (dry) / m ² and then dried at 40 ° C. for 1 minute, and further 160 W / cm × 10 m / min. × 4
Ionizing radiation-curable resin layer 2 was formed by irradiating ultraviolet rays of pass to obtain a surface material of a tablet for pen input computer which is an example product of the present invention.

The thickness of the ionizing radiation-curable resin layer 2 on the surface material of the tablet for pen input computer is about 5 μm.
m.

Examples 2 and 3 and Comparative Example 1 In Example 1, all other conditions were changed by changing the particle size and blending amount of the acrylic resin beads.
In the same manner as described above, a surface material for a tablet for pen input computer as an example product and a comparative example product of the present invention was obtained.

Example 4 An acrylic UV-curable resin was coated on one side of a base material (diamond foil O-300E) made of a transparent polyethylene terephthalate film having a thickness of 125 μm by a roll coater method to 7 g (dry) / m ² . After that, the polyethylene terephthalate film (thickness: 26 μm, manufactured by Toray Industries, Inc.), which is mat-processed, is laminated on the coated surface so that the mat-processed surface is in contact with the coated surface. Ultraviolet irradiation was performed under the same conditions.

Thereafter, the polyethylene terephthalate film which has been mat-processed is peeled off,
A surface material of a tablet for pen input computer which is an example product of the present invention was obtained.

Example 5 and Comparative Example 2 In Example 4, all the other conditions were the same as in Example 4 except that only the type of shaped film was changed, and the products of Example and Comparative Example of the present invention were used. The surface material of a tablet for pen input computer was obtained.

In Experiment 1 [FIG. 2], a glass plate 4 having a transparent conductive film 3 formed on one side and a polyethylene terephthalate film side 1 of the surface material of the tablet for pen input computer obtained in the above-mentioned Examples and Comparative Examples The transparent conductive film 5 and the transparent conductive film 5 are overlapped with each other via a spacer 6 to a computer with a pen input operating system using a transparent resistance film type digitizer, and a polyacetal nib "Wacom Co., Ltd .: Diameter" 1.5 mm, tip 0.5 m
It was written with a pen for pen input computer equipped with "around m".

Experiment 2 In [FIG. 3], the polyethylene terephthalate film 1 side of the surface material of the tablet for pen input computer obtained in the above Examples and Comparative Examples was placed on the glass plate 8 having the transparent conductive film 7 formed on one side. I wrote with a pen for a pen input computer equipped with a pen tip made of polyacetal on a computer with a pen input operating system using a transparent electrostatic coupling type digitizer that was superimposed.

The writing suitability of the results of the above Experiments 1 and 2 is shown in [Table 1] together with the surface characteristics (surface roughness) of the surface material of the tablets for pen input computer of each Example and Comparative Example.

In the writing aptitude in Table 1, ⊚ indicates extremely good, ∘ indicates good, Δ indicates slightly insufficient, × indicates insufficient, and XX indicates extremely insufficient.

[0034]

[Table 1]

As shown in the results of [Table 1], the products of Examples of the present invention had good writing suitability and had optical characteristics as a display.

[0036]

According to the surface material of the tablet for a pen input computer of the present invention, a pen input computer having a pen tip made of plastic such as polyacetal is provided on the surface of the digitizer in a computer with an operating system exclusively for pen input. When writing by operating the pen, a resistance feeling similar to writing with a pen on ordinary paper is obtained, and excellent characteristics are provided in the input feeling with the pen.

[Brief description of drawings]

FIG. 1 is a model cross-sectional view showing one embodiment of a surface material of a tablet for pen input computer of the present invention.

FIG. 2 is a transparent resistance film type digitizer 1 using the surface material of the tablet for pen input computer shown in FIG.
It is a model cross section which shows an Example product.

3 is a model cross-sectional view of one embodiment of a transparent electrostatic coupling type digitizer using the surface material of the tablet for pen input computer shown in FIG.

[Explanation of symbols]

 1: Base material made of transparent plastic film 2: Ionizing radiation curable resin layer 3: Transparent conductive film 4: Glass plate 5: Transparent conductive film 6: Spacer 7: Transparent conductive film 8: Glass plate

Claims (1)

[Claims] 1. A substrate comprising a transparent plastic film and an ionizing radiation curable resin layer formed on the surface of the substrate, wherein the ten-point average of the surface of the ionizing radiation curable resin layer. The roughness (Rz) is 0.5 to 5.0 μm, and the average spacing (Sm) of the surface irregularities is 50 to 500.
The surface material of the tablet for pen input computer, which is characterized by being μm.