TW201732503A - Writing sheet for touch panel pen, touch panel, touch panel system, display device, and sorting method for writing sheet for touch panel pen - Google Patents

Abstract

Provided is a writing sheet for a touch panel pen such that if the apparent Young's modulus of the structure of the shaft and the pen tip is taken as E, the diameter of the pen tip is taken as D, and the arithmetic mean height of the profile curve at unit measurement segments (0.5mm) of the pen tip is taken as Pa, then the value X derived from X(MN/m)=[E*D*D]/Pa does not exceed 500 MN/m. The writing sheet has a surface wherein the maximum height roughness Rz0.8 and the maximum valley depth Rv0.8 of the roughness curve, as measured according to JIS B 0601:2001 with a cutoff value of 0.8mm, and the local peak average spacing S2.5, as measured according to JIS B 0601:1994 with a cutoff value of 2.5mm, satisfy the conditions 0.35 ≤ Rv0.8/Rz0.8 ≤ 0.60 and 0.5mm ≤ S2.5 ≤ 0.30mm.

Description

Touch panel pen writing piece, touch panel, touch panel system and display device, and picking method of touch panel pen writing piece

The invention relates to a touch panel pen writing piece, a touch panel, a touch panel system and a display device, and a method for selecting a touch panel pen writing piece.

In recent years, touch panels have also been installed on many mobile information terminals, and traffic has increased. The surface protection sheet may be attached to the surface of the touch panel for various purposes.

Regarding the conventional mainstream resistive touch panel, since the operation of touching with a finger or a pen is repeated, a high scratch resistance is required for the surface protective sheet.

On the other hand, for the surface protection sheet of the current capacitive touch panel which is the mainstream, the slidability when operating with a finger is required. The reason is that since the previous resistive film type cannot detect multiple parts at the same time, the finger is not moved on the screen, but the capacitive touch panel can simultaneously detect multiple parts, and the operation of moving the finger on the screen is more many.

Moreover, for the resistive film type and the capacitive touch panel, the surface protective sheet for the touch panel is required to have the following properties: to prevent fingerprints from being attached when the finger is operated, or to easily erase the attached fingerprint.

As a surface protection sheet for a touch panel as described above, for example, a patent document is proposed. Offer 1~2.

[Previous Technical Literature]

[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2015-114939

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2014-109712

Since the capacitive touch panel is required to measure the change in electrostatic capacitance and identify the portion touched, the contact material needs a certain conductivity. Therefore, in the initial appearance of the capacitive touch panel, only the operability of the finger was studied, and the writing property of drawing characters or drawings by the touch panel pen was not studied. That is, in the resistive film type touch panel, the operation when the touch panel pen is used is also the touch, and the writing property when drawing characters or pictures is not taken seriously.

However, in recent years, since the touch panel pen that can write input to the capacitive touch panel or the electromagnetic induction touch panel has been proposed, and the application software corresponding to the text input or drawing using the touch panel pen has increased, A surface protection sheet for a touch panel requires a good writing feeling using a touch panel pen.

However, regarding the surface protection sheets for the touch panel of Patent Documents 1 to 2 which have been proposed previously, no research has been made on the writing feeling using the touch panel pen.

An object of the present invention is to provide a touch panel pen writing sheet, a touch panel and a display device which can improve the writing feeling, and a method for selecting a touch panel pen writing sheet.

In order to solve the above problems, the present invention provides the following touch panel writing pad, touch panel, touch panel system and display device of [1] to [14], and a method for selecting a touch panel pen.

[1] A writing sheet for a touch panel pen, which is a writing sheet for a touch panel pen (A) having a maximum height roughness of JIS B0601: 2001 having a cutoff value of 0.8 mm. The maximum valley depth Rv _{0.8 of} Rz _0.8 and the roughness curve, and the partial peak interval S _2.5 of JIS B0601:1994 with a cutoff value of 2.5 mm satisfy the surfaces of the following conditions (A1) and (A2).

0.35≦Rv _0.8 /Rz _0.8 ≦0.60 (A1)

0.05mm≦S _2.5 ≦0.30mm (A2)

<Touch Panel Pen (A)>

The touch panel pen sets the apparent Young's modulus of the structure constituting the pen tip and the axis of the touch panel pen to E, sets the diameter of the pen tip to D, and sets the pen tip in the unit measurement section (0.5 mm). When the arithmetic mean height of the profile curve is Pa, the X derived from the following formula (i) is 500 MN/m or less.

X(MN/m)=[E×D×D]/Pa (i)

[2] A touch panel having a sheet on the surface thereof, wherein the surface of the touch panel pen writing sheet described in the above [1] that satisfies the conditions (A1) and (A2) is arranged to face the touch. The surface of the panel is made.

[3] A display device having a touch panel, wherein the touch panel is the touch panel described in [2] above.

[4] A method for selecting a writing pad for a touch panel pen, which has a maximum height roughness Rz _0.8 of a JIS B0601:2001 having a cutoff value of 0.8 mm and a maximum valley depth Rv _{0.8 of a} roughness curve, and a cutoff value of 2.5 mm. The partial average interval S _2.5 of JIS B0601: 1994 satisfies the surface of the following conditions (A1) and (A2) as the following writing sheet for the touch panel pen (A).

0.35≦Rv _0.8 /Rz _0.8 ≦0.60 (A1)

0.05mm≦S _2.5 ≦0.30mm (A2)

<Touch Panel Pen (A)>

The touch panel pen sets the apparent Young's modulus of the structure constituting the pen tip and the axis of the touch panel pen to E, sets the diameter of the pen tip to D, and sets the pen tip in the unit measurement section (0.5 mm). When the arithmetic mean height of the profile curve is Pa, the X derived from the following formula (i) is 500 MN/m or less.

X(MN/m)=[E×D×D]/Pa (i)

[5] A touch panel pen writing sheet, which is a writing sheet for a touch panel pen (B) having a maximum height roughness Rz _0.8 and a roughness of JIS B0601:2001 having a cutoff value of 0.8 mm. The maximum mountain height Rp _{0.8 of the} degree curve, and the skewness Psk of the profile curve in the measurement interval of 1 mm satisfy the surfaces of the following conditions (B1) and (B2), and the haze of the writing piece JIS K7136:2000 (haze) The following condition (B3) is satisfied.

0.50<Rp _0.8 /Rz _0.8 ≦0.75 (B1)

0.60≦Psk (B2)

Haze is 5.0% or more (B3)

<Touch Panel Pen (B)>

The touch panel pen sets the apparent Young's modulus of the structure constituting the pen tip and the axis of the touch panel pen to E, sets the diameter of the pen tip to D, and sets the pen tip in the unit measurement section (0.5 mm). Section When the arithmetic mean height of the surface curve is set to Pa, X derived from the following formula (i) exceeds 500 MN/m.

X(MN/m)=[E×D×D]/Pa (i)

[6] A touch panel having a sheet on the surface thereof, wherein the surface of the touch panel pen writing sheet described in the above [1] that satisfies the conditions (B1) and (B2) is disposed toward the touch panel. The surface is made.

[7] A display device comprising a touch panel, wherein the touch panel is the touch panel described in [6] above.

[8] A method for selecting a writing pad for a touch panel pen, selecting a maximum height roughness Rz _0.8 of a JIS B0601:2001 having a cutoff value of 0.8 mm and a maximum mountain height Rp _{0.8 of a} roughness curve, and a profile of a measurement interval of 1 mm The skewness Psk of the curve satisfies the surfaces of the following conditions (B1) and (B2), and

The sheet of the JIS K7136:2000 having the haze satisfying the following condition (B3) is used as the writing sheet for the touch panel pen (B) described below.

0.50<Rp _0.8 /Rz _0.8 ≦0.75 (B1)

0.60≦Psk (B2)

Haze is 5.0% or more (B3)

<Touch Panel Pen (B)>

The touch panel pen sets the apparent Young's modulus of the structure constituting the pen tip and the axis of the touch panel pen to E, sets the diameter of the pen tip to D, and sets the pen tip in the unit measurement section (0.5 mm). When the arithmetic mean height of the profile curve is set to Pa, X derived from the following formula (i) exceeds 500 MN/m.

X(MN/m)=[E×D×D]/Pa (i)

[9] A method for selecting a writing pad for a touch panel pen, and picking a writing piece satisfying the following condition (C1) as a touch panel pen.

<condition (C1)>

The touch panel pen is fixed in a state of contacting the surface of the touch panel pen with a writing angle of 60 degrees, and a vertical load of 100 gf is applied to the touch panel pen to scan a length of one step of 40 mm at a speed of 14 mm/sec. The dynamic friction coefficient acting in the scanning direction of the touch panel pen at this time is μk, and when the static friction coefficient is μs, μk/μs is 0.30 or more and 0.58 or less.

[10] The method of picking a touch panel pen for writing a touch panel according to claim 12, wherein the following condition (C2) satisfying the following condition (C2) is selected as a touch panel pen writing sheet.

<condition (C2)>

0.06≦μk≦0.30

[11] A writing sheet for a touch panel pen having a surface satisfying the following condition (C1).

<condition (C1)>

The touch panel pen is fixed in a state of contacting the surface of the touch panel pen with a writing angle of 60 degrees, and a vertical load of 100 gf is applied to the touch panel pen to scan a length of one step of 40 mm at a speed of 14 mm/sec. The dynamic friction coefficient acting in the scanning direction of the touch panel pen at this time is μk, and when the static friction coefficient is μs, μk/μs is 0.30 or more and 0.58 or less.

[12] A touch panel having a sheet on the surface thereof, wherein the surface of the touch panel pen writing sheet described in the above [11] that satisfies the condition (C1) is disposed to face the surface of the touch panel. .

[13] A touch panel system comprising a touch panel having a touch panel pen for writing on a surface A touch panel pen is constructed, and the touch panel system satisfies the following condition (C1).

<condition (C1)>

The touch panel pen is fixed in a state of contacting the surface of the touch panel pen with a writing angle of 60 degrees, and a vertical load of 100 gf is applied to the touch panel pen to scan a length of one step of 40 mm at a speed of 14 mm/sec. The dynamic friction coefficient acting in the scanning direction of the touch panel pen at this time is μk, and when the static friction coefficient is μs, μk/μs is 0.30 or more and 0.58 or less.

[14] A display device comprising a touch panel, wherein the touch panel is the touch panel described in [12] above.

The touch panel pen for a touch panel, the touch panel, the touch panel system, and the display device of the present invention can improve the writing feeling. Moreover, the method for selecting a writing sheet for a touch panel pen according to the present invention can select a writing sheet having a good writing feeling for a specific touch panel pen without performing a writing test of the touch panel pen, and can perform writing with high efficiency. Product design and quality management.

1‧‧‧Plastic film

2‧‧‧ resin layer

10‧‧‧Touch panel pen writing piece

2.0‧‧‧Transparent substrate

30‧‧‧Electrical film

40‧‧‧ Spacer

50‧‧‧X-axis electrode

60‧‧‧Y-axis electrode

70‧‧‧Insulator layer

82‧‧‧ movable platform

83‧‧‧ weights

84‧‧‧ Keeper

85‧‧‧Base

100‧‧‧ touch panel

200‧‧‧Touch panel pen

300‧‧‧ fixture

400‧‧‧Stainless steel plate

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing an embodiment of a writing pad for a touch panel pen according to the present invention.

Fig. 2 is a cross-sectional view showing another embodiment of the writing pad for a touch panel pen of the present invention.

Fig. 3 is a cross-sectional view showing an embodiment of a touch panel of the present invention.

Fig. 4 is a cross-sectional view showing another embodiment of the touch panel of the present invention.

Fig. 5 is a schematic view showing a method of measuring the apparent Young's modulus E of the structure of the pen tip and the shaft.

FIG. 6 is a view for explaining a method of calculating the diameter D of the touch panel pen.

Fig. 7 is a schematic view for explaining a method of measuring a friction coefficient.

Hereinafter, the touch panel pen writing sheet, the touch panel, the touch panel system and the display device, and the method for selecting the touch panel pen writing sheet according to the present invention, the embodiment A, the embodiment B, and the embodiment C Give an example for explanation.

<Embodiment A>

[Touch Panel Pen Writing Tablet]

The touch panel pen writing blade of the embodiment A is a writing piece for the touch panel pen (A) described below, and the writing piece has a maximum height roughness Rz _0.8 and roughness of JIS B0601:2001 with a cutoff value of 0.8 mm. The maximum valley depth Rv _{0.8 of the} curve and the partial peak interval S _2.5 of JIS B0601:1994 with a cutoff value of 2.5 mm satisfy the surfaces of the following conditions (A1) and (A2).

0.35≦Rv _0.8 /Rz _0.8 ≦0.60 (A1)

0.05mm≦S _2.5 ≦0.30mm (A2)

<Touch Panel Pen (A)>

The touch panel pen is set to set the apparent Young's modulus of the structure of the pen tip and the shaft constituting the touch panel pen to E, the diameter of the pen tip to D, and the unit measurement interval (0.5 mm) of the pen tip. When the arithmetic mean height of the cross-sectional curve is Pa, the X derived from the following formula (i) is 500 MN/m or less.

X(MN/m)=[E×D×D]/Pa (i)

Furthermore, the unit of the Young's modulus E is "N/m ² ", the unit of the diameter D of the nib is "m", and the unit of the arithmetic mean height Pa is "m". Also, "M" means "mega(10 ⁶ )".

Fig. 1 is a cross-sectional view showing an embodiment of a touch panel pen writing sheet 10 of the embodiment A. The writing sheet 10 for a touch panel pen of FIG. 1 has a resin layer 2 on one side of the plastic film 1. The touch panel pen writing sheet 10 of FIG. 2 is a single layer of the resin layer 2.

The writing sheet for the touch panel pen of Embodiment A can satisfy the conditions (A1) and (A2) on one surface, or the two surfaces can satisfy the conditions (A1) and (A2).

The writing sheet for a touch panel pen according to Embodiment A may be in the form of a single sheet, or may be in the form of a roll in which a long sheet is wound into a roll.

Hereinafter, there is a case where the writing piece for a touch panel pen is referred to as a "writing sheet". In addition, hereinafter, the surface satisfying the conditions (A1) and (A2) is referred to as a "writing surface".

<writing surface>

The writing sheet for a touch panel pen according to Embodiment A is one in which at least one surface satisfies the conditions (A1) and (A2).

In the embodiment A, the condition (A1) and the condition (A2) use different cutoff values. Hereinafter, the reason why two kinds of cutoff values (0.8 mm, 2.5 mm) are used will be described.

The cutoff value indicates a value obtained by cutting off the ripple component from a profile curve composed of a roughness component (high-frequency component) and a ripple component (low-frequency component). In other words, the cutoff value is a value indicating the fineness of the filter which cuts the ripple component (low frequency component) from the profile curve. If the cutoff value is large, the filter is sparse, so the larger ripple component of the ripple component is cut off, but the smaller ripple component is not cut off. On the other hand, if the cutoff value is small, the filter is dense, and thus the ripple component is substantially cut off. In other words, when the cutoff value is small, the influence on the unevenness of the high-frequency component is increased, and when the cutoff value is large, the influence on the unevenness of the low-frequency component is enhanced.

JIS B0633 referred to in JIS B0601, based on the value of arithmetic mean roughness Ra Use a specific cutoff value (standard length). That is, in JIS, a single cutoff value is used for any sample, and a plurality of cutoff values are not assumed to be used.

The inventors of the present invention have made an effort to study the relationship with the writing sense of a writing sheet. It was found that the physical properties of the nib can seriously affect the sense of writing. The physical property of the pen tip here is based on the hardness of the structure of the pen tip and the axis of the touch panel pen (Young's modulus E), the diameter D of the pen tip, and the roughness of the pen tip (the arithmetic mean height Pa of the profile curve of the pen tip) , "X" calculated from the above formula (i). The situation in which X will seriously affect the sense of writing can be explained as follows.

First, the Young's modulus E is a basic physical property indicating the easiness of deformation of the nib due to the load, and there is a tendency that the smaller the Young's modulus E is, the more easily the nib is deformed by the load. Then, the square of the diameter D indicates the degree of dispersion load, and there is a tendency that the smaller the square of the diameter D, the more difficult it is to disperse the load, and the pen tip is more likely to be deformed by the load. That is, the case where the "Young's modulus E × diameter D × diameter D" is smaller, the pen tip is more easily deformed, and the pen tip and the writing piece are more easily contacted. Secondly, the arithmetic mean height Pa of the profile curve of the nib indicates the extent to which the nib contacts the writing piece. Specifically, the larger the Pa, the more the pen tip and the writing piece become point contact, and the contact area between the pen tip and the writing piece becomes smaller. Therefore, the case where the value of "X" calculated from [Young's modulus E × diameter D × diameter D] ÷ Pa is smaller, the more easily the pen tip and the writing piece are in close contact with each other, and the writing feeling is greatly affected.

Further, the present inventors have found that when the X value is small, the following behavior is exhibited at the time of writing.

First, when the value of X is small, the tip of the pen is deformed in such a manner as to follow the surface shape of the writing piece at the stage of making the pen contact the writing piece and the stage of starting writing, and the contact between the pen tip and the writing film changes in a minute area. close. Therefore, the bump of the high-frequency component is at the stage of writing The effect of rubbing resistance becomes larger.

Then, at the stage after the start of writing, with the movement of the writing speed increasing, the frequency of the close contact between the nib and the film in the minute region is lowered by the help of the unevenness of the low-frequency component of the film, and the unevenness of the high-frequency component is rubbed. The influence of the resistance is lowered. On the other hand, the influence of the unevenness of the low-frequency component having a large amount of unevenness on the frictional resistance becomes large.

Then, the present inventors further studied based on the above behavior, and found that by designing the surface shape using two kinds of cutoff values, the writing feeling from the start of writing to the end of writing can be made good. Moreover, when writing a text or drawing a graphic, most of the writing is stopped for a while before writing (for example, when the writing direction is switched, the writing is usually stopped for a while; and the writing is stopped for a moment when the writing position is moved). The present inventors have also regarded this type of writing as "beginning writing" immediately after writing.

The condition (A1) is that the maximum height roughness Rz _0.8 of JIS B0601:2001 and the maximum valley depth Rv _{0.8 of the} roughness curve when the cutoff value is set to 0.8 mm satisfy 0.35 ≦ Rv _0.8 /Rz _0.8 ≦ 0.60.

The cutoff value of the condition (A1) is 0.8 mm. The condition (A1) is a parameter indicating the unevenness of the high-frequency component and mainly affecting the writing feeling at the time of starting writing.

The condition (A1) of Rv _0.8 /Rz _0.8 represents the ratio of the valley of the high-frequency component. The tip of the pen is in close contact with the mountain of the bump. On the other hand, the nib is difficult to enter the valley of the bump, so the valley suppresses the peeling force (frictional resistance) of the nib when the writing starts. Therefore, by setting Rv _0.8 /Rz _0.8 within the above range, the peeling force (frictional resistance) of the nib at the time of starting writing becomes appropriate, and the writing feeling at the start of writing can be made good. Further, by setting Rv _0.8 /Rz _0.8 within the above range, the pen can be easily placed on the surface of the writing sheet.

On the other hand, when Rv _0.8 /Rz _{0.8 is} less than 0.35, the ratio of the valley is too small, so there is a feeling of being stuck, and the writing feeling at the start of writing cannot be made good. Further, when Rv _0.8 /Rz _0.8 exceeds 0.60, the ratio of the valley is too large, so that there is a smooth feeling, and the writing feeling at the start of writing cannot be made good, and it is difficult to make the pen stand still.

The condition (A1) preferably satisfies 0.37 ≦ Rv _0.8 / Rz _0.8 ≦ 0.55, more preferably 0.40 ≦ Rv _0.8 / Rz _0.8 ≦ 0.50.

Further, the calculation condition (A1) of the reference of Rv _0.8, Rz _0.8 is set based on the average of 20 samples each of the measurement times of 1. Further, the following S _2.5 , Pp, Pv, Pa, Ra, transmission clarity, and haze are also average values measured once for each of the 20 samples.

The condition (A2) requires that the partial peak interval S _2.5 of JIS B0601:1994 when the cutoff value is set to 2.5 mm satisfies 0.05 mm ≦ S _2.5 ≦ 0.30 mm.

The cutoff value of condition (A2) is 2.5 mm. The condition (A2) is a parameter indicating the unevenness of the low-frequency component and mainly affecting the writing feeling after starting writing.

The S _2.5 of the condition (A2) represents the local average interval of the low-frequency components. After starting to write, the nib moves while touching the top of the mountain. Therefore, S _2.5 will have an impact on the feeling after starting writing. Thus, by the S _2.5 is set within the above range, the frictional resistance becomes appropriate after the start writing, and the writing performance since it can start writing becomes good.

When the S _{2.5 is} less than 0.05 mm, there is too much local mountain top, so there is a feeling of being stuck, and it is impossible to make the writing feeling after starting writing become good. Further, when the S _2.5 exceeds 0.30 mm, the local mountain top is too small compared with the contact area of the nib, and there is a smooth feeling, and the writing feeling after starting writing cannot be made good.

The condition (A2) preferably satisfies 0.05 mm ≦ S _2.5 ≦ 0.25 mm, more preferably 0.05 mm ≦ S _2.5 ≦ 0.15 mm. Further, setting S _2.5 to 0.05 mm or more is also related to suppression of reduction in resolution of the display element. In particular, it is preferable in that the resolution of the ultra high definition display element having a pixel density of 300 ppi or more can be suppressed.

Further, in the writing sheet of the embodiment A, the unit measurement section is preferably set to 1 mm, the maximum height of the mountain height of the section curve in the unit measurement section is Pp, and the maximum value of the valley depth of the section curve in the unit measurement section is set to In Pv, the sum of Pp and Pv is set as the maximum profile height Pt of the profile curve in the unit measurement section, and when the average value of Pt of the five measurement sections is Ptm, the Ptm of the writing surface satisfies the following condition (A3).

0.01μm≦Ptm≦1.00μm (A3)

The maximum mountain height Pp of the profile curve in the unit measurement interval is defined as the mountain above the elevation line of the unit measurement interval, indicating the height of the highest mountain. Further, the maximum mountain height Rp of the roughness curve of Pp and JIS B0601:2001 is different from the calculation of the parameter in terms of Pp being a profile curve and Rp being a roughness curve.

The valley depth maximum value Pv of the profile curve in the unit measurement interval is defined as a valley below the elevation line of the unit measurement interval, indicating the depth of the deepest valley. Further, the maximum valley depth Rv of the roughness curve of Pv and JIS B0601:2001 is different from the calculation of the parameter in that Pv is a profile curve and Rv is a roughness curve.

As described above, the high-frequency unevenness has a large influence on the writing feeling at the time of starting writing, and the low-frequency unevenness has a large influence on the writing feeling after starting writing. However, the unevenness of the high-frequency concavities and the low-frequency concavities and convexities also has a certain influence on the writing feeling at the start of writing and the writing feeling after starting writing. The condition (A3) means that the difference in elevation between the unevenness of the high frequency and the unevenness of the low frequency (cutoff value 0) is not too small and is not excessive. Therefore, by setting the condition (A3) to the above range, the writing feeling from the start of writing to the end of writing can be made better. it is good.

The condition (A3) more preferably satisfies 0.10 μm ≦ Ptm ≦ 0.85 μm, and further preferably satisfies 0.35 μm ≦ Ptm ≦ 0.75 μm.

Further, in the writing surface of the writing sheet of the embodiment A, it is preferable that the arithmetic mean roughness Ra _0.8 of JIS B0601:2001 when the cutoff value is 0.8 mm satisfies the following condition (A4).

0.01μm≦Ra _0.8 ≦0.50μm (A4)

By setting Ra _0.8 to the above range, the writing feeling can be made better, and the resolution of the display element can be suppressed by the writing sheet. In particular, it is preferable in that the resolution of the ultra high definition display element having a pixel density of 300 ppi or more can be suppressed.

The condition (A4) is more preferably 0.03 μm ≦ Ra _0.8 ≦ 0.30 μm, further preferably 0.05 μm ≦ Ra _0.8 ≦ 0.15 μm.

Further, the writing sheet of the embodiment A is preferably fixed while the touch panel pen (A) is in contact with the writing surface at an angle of 60 degrees, and a vertical load of 100 gf is applied to the touch panel pen (A). The length of one-way 40mm is scanned at a speed of 14mm/sec, and the dynamic friction coefficient acting on the scanning direction of the touch panel pen (A) is set to μk, and when the static friction coefficient is set to μs, it satisfies 0.30≦μk/μs≦0.58. Relationship. Further, in the embodiment A, the dynamic friction coefficient μk means the average value of the dynamic friction coefficients of all the measurement times. The static friction coefficient is set to be the peak value of the initial frictional force equal to or higher than the dynamic friction coefficient as the measurement time elapses from the frictional force 0. The measurement interval of the coefficient of friction is preferably set to 0.02 seconds.

When writing text or drawing graphics, most of them stop writing for a while before starting to write (for example, when switching the writing direction, usually stop writing for a moment. Also, when writing the writing position, the writing will stop writing for a moment). When you stop writing for a while and then start writing, you are susceptible to static friction. The effect of the difference between the number and the dynamic friction coefficient, but by setting μk/μs to the above range, the imaginary writing can be realized even when writing is stopped after the writing is stopped (for example, the writing direction can be converted to the expected one). direction).

In order to satisfy the relationship of 0.30 ≦μk/μs ≦ 0.58, it is preferable to satisfy the above conditions (A1) and (A2), and it is better to satisfy the above conditions (A1) to (A3), and it is preferable to satisfy the above conditions (A1) to (A4). ).

Further, in order to make the above effects more favorable, μk/μs more preferably satisfies the relationship of 0.30 ≦ μk/μs ≦ 0.44.

The μk/μs is a value obtained by measuring μk/μs of each sample for each of 20 samples and averaging μk/μs of 20 samples.

Further, even when the touch panel pen is fixed in a state in which the writing surface is touched at an angle other than 60 degrees (for example, an arbitrary angle in the range of 30 to 75 degrees), it is preferable that μk/μs is in the above range. Further, even when the scanning speed is set to a speed other than 14 mm/sec (for example, an arbitrary speed in the range of 0.1 to 100 mm/sec), it is preferable that μk/μs is in the above range.

Further, from the viewpoint of not being excessively smooth and obtaining a moderate feeling of resistance, μk and μs are preferably in the following ranges. The μk is preferably from 0.06 to 0.30, more preferably from 0.08 to 0.28. The μs is preferably from 0.15 to 0.95, more preferably from 0.20 to 0.60.

Fig. 7 is a schematic view for explaining a method of measuring μk and μs.

In FIG. 7, the touch panel pen 200 is fixed by the holder 84 in a state of contacting the writing sheet 10. Further, a susceptor 85 for placing the weight 83 is attached to the upper portion of the holder 84. A weight 83 is placed on the base 85, and a vertical load is applied to the touch panel pen by the weight. The writing sheet 10 is fixed to the movable table 82.

When measuring the friction coefficient, in a state where the touch panel pen is fixed in the above manner, the movable table 82 is moved toward the obtuse angle side (the left side of FIG. 7) of the corner formed by the movable table and the touch panel pen at a specific speed. scanning.

As a measurable device shown in Fig. 7, a trade name HEIDON-14DR manufactured by Shinto Scientific Co., Ltd. is mentioned.

The apparent Young's modulus E of the tip of the touch panel pen and the structure of the shaft can be calculated from the variation in the direction of compression of the tensile tester and the load characteristics. Specifically, as shown in FIG. 5, the axial length after the jig 300 is fixed to a portion 10 cm away from the pen tip by both sides is set to L, and the amount of deformation and application when a vertical load of 5 gf is applied to the pen axis direction via the jig 300 is applied. The difference ΔL in the deformation amount at the time of the vertical load of 100 gf is defined as the displacement, and the load difference 95 gf is ΔF, and the sectional area S obtained from the diameter of the nib is calculated by the following formula (ii). The object to be pressed against the touch panel pen 200 is a stainless steel plate 400 having a thickness of 3 mm or more. Further, in the case where the pen is unstable when pressed against the pen, it is only necessary to provide a recess for stabilizing the pen on the surface of the plate, and to allow the pen to contact the position of the recess.

Regarding the environment in which the Young's modulus E was measured, the temperature system was set to 23 ° C ± 5 ° C, and the humidity system was set to 50% ± 10%. Moreover, before the measurement of the Young's modulus E is started, the touch panel pen is placed in an environment of 23 ° C ± 5 ° C and a humidity of 50% ± 10% for 10 minutes or more.

σ(stress)=ΔF/S

ε (strain) = ΔL / L

E=σ/ε (ii)

The diameter D of the nib is calculated based on a photograph obtained by photographing the touch panel pen from the direction perpendicular to the pen axis. Figure 6 is a broken line showing the side from the direction perpendicular to the pen axis The shape of the touch panel pen when taking a touch panel pen. As shown in Fig. 6(a), when the circle passing through the apex of the photograph and not extending from the photograph overlaps, the diameter of the largest circle is defined as the diameter D of the nib. However, if the photograph has a slope as shown in Fig. 6(b), and the angle formed by the slope with the pen shaft is 40 to 90 degrees, the slope may be extended to overlap the circle.

The arithmetic mean height Pa of the profile curve in the unit measurement interval (0.5 mm) of the nib can be calculated by photographing the shape of the nib using a digital microscope, and simulating the contour of the obtained nib as a profile curve. The direction of the average line extracts only the length L of the unit measurement section (0.5 mm), and the average value of the deviation of the extracted portion until the deviation of the measurement curve is totaled and averaged. Specifically, Pa can be calculated from the following formula (iii). When the tip of the pen has a curvature, the Pa can be calculated by correcting the curved surface to a straight line. Furthermore, the intermediate point of the unit measurement interval (0.5 mm) preferably coincides with the center of the pen tip.

As the digital microscope, for example, the trade name of the Ens company, VHX-5000, or the like can be used.

Further, the calculation of the arithmetic mean roughness Ra of Pa and JIS B0601:2001 is based on the fact that Pa is a profile curve and Ra is a roughness curve.

Further, the writing sheet of the embodiment A is preferably such that the width of the optical frequency comb of the image resolution measuring device measured according to JIS K7374:2007 is 0.125 mm, 0.5 mm, 1.0 mm, and 2.0 mm. When the degree is C _0.125 , C _0.5 , C _1.0 and C _2.0 , the total C _s of C _0.125 , C _0.5 , C _1.0 and C _2.0 is 250% or more, more preferably 270% or more, and further preferably 280% or more. .

By setting C _s to 2.50% or more, the resolution of the display element can be suppressed by the writing sheet. In particular, it is preferable in that the resolution of the ultra high definition display element having a pixel density of 300 ppi or more can be suppressed. The upper limit of C _s is not particularly limited and is about 399%.

Further, in the writing sheet of the embodiment A, the haze of JIS K7136:2000 is preferably less than 5.0%, more preferably 3.0% or less, still more preferably 1.0% or less.

By setting the haze to 5.0% or less, the resolution of the display element can be suppressed from being lowered by the writing sheet. In particular, it is preferable in that the resolution of the ultra high definition display element having a pixel density of 300 ppi or more can be suppressed. The lower limit of the haze is not particularly limited, but is preferably 0.1% or more, and more preferably 0.2% or more.

Further, when the transmission image sharpness and the haze are measured, light is incident from the surface of the writing sheet opposite to the writing surface. When the two surfaces of the writing sheet satisfy the above conditions (A1) and (A2), the light incident surface may be either surface.

<Structure of the whole writing sheet>

In the touch panel pen writing sheet of the embodiment A, the configuration is not particularly limited as long as at least one surface satisfies the conditions (A1) and (A2).

For example, the configuration of the touch panel pen writing sheet 10 of the embodiment A includes a resin layer 2 as shown in FIGS. 1 and 2, and one surface of the resin layer 2 satisfies the conditions (A1) and (A2). By.

Further, although not shown, other layers than the resin layer or the plastic film may be provided, and the surfaces of the other layers satisfy the conditions (A1) and (A2). Examples of the other layer include an antistatic layer, an antifouling layer, and the like. Further, although not shown, the resin layer may be composed of two or more layers.

The surface (writing surface) satisfying the conditions (A1) and (A2) may be formed by (a) physical or chemical treatment such as embossing, sand blasting, etching, (b) molding by a mold, (c) coating, or the like. to make. Among these methods, from the viewpoint of the reproducibility of the surface shape, it is preferable that the molding of the mold (b) is carried out, and the coating of (c) is preferable from the viewpoint of productivity and a plurality of types.

The molding of the mold can be carried out by forming a mold composed of shapes complementary to the shapes satisfying the conditions (A1) and (A2), allowing the material forming the resin layer to flow into the mold and then taking it out from the mold. Here, if a material constituting the resin layer is used as the material, the material is poured into the mold, the plastic film is superposed, and the resin layer is taken out from the mold together with the plastic film, and a resin layer is obtained on the plastic film, and The surface of the resin layer satisfies the writing sheet for a touch panel pen of the conditions (A1) and (A2). Further, the resin layer is directly taken out from the mold without using a plastic film, or the plastic film is taken out from the mold, and the plastic film is peeled off, whereby a single layer of the resin layer can be obtained, and the surface of the resin layer satisfies the condition (A1) And (A2) the touch panel pen for writing.

When a curable resin composition (thermosetting resin composition or free radiation curable resin composition) is used as the material flowing into the mold, it is preferred to cure the curable resin composition before taking out from the mold.

The resin layer forming coating liquid containing the resin component, the particles, and the solvent can be applied to the plastic film by a known coating method such as gravure coating or bar coating. It is formed by drying and hardening.

In order to satisfy the above conditions in the surface shape of the resin layer formed by coating, it is preferred to form a first resin layer having a film thickness, a particle content, and an average particle diameter of the particles in the following range. A second resin layer is formed on a resin layer.

The film thickness of the first resin layer is preferably from 1.5 to 10 μm, more preferably from 2 to 8 μm, still more preferably from 4 to 7 μm. The film thickness of the first resin layer and the second resin layer described below may be, for example, according to The thickness of 20 sections was measured using an image of a cross section taken by a transmission electron microscope (TEM) or a scanning transmission electron microscope (STEM), and was calculated from the average value of the values at 20. The acceleration voltage of the TEM or STEM is preferably set to 10 to 30 kV, and the magnification is preferably set to 50,000 to 300,000 times.

As the particles of the first resin layer, any of organic particles and inorganic particles can be used. Examples of the organic particles include polymethyl methacrylate, polyacrylic acid-styrene copolymer, melamine resin, polycarbonate, polystyrene, polyvinyl chloride, benzoguanamine-melamine-formaldehyde condensate, and polyfluorene. Particles composed of oxygen, a fluorine resin, a polyester resin, or the like. Examples of the inorganic particles include particles composed of ceria, alumina, cerium, zirconia, and titania. Among these particles, organic particles are preferred from the viewpoint of easiness of dispersion control.

The content of the particles in the first resin layer is preferably from 0.1 to 15% by mass, more preferably from 0.2 to 12% by mass, even more preferably from 0.3 to 10% by mass, based on the total solid content of the resin layer.

The average particle diameter of the particles in the first resin layer is preferably 0.2 to 8.0 μm, more preferably 0.3 to 7.0 μm, still more preferably 0.5 to 5.0 μm. In the case where the particles are aggregated, it is preferred that the average particle diameter of the aggregated particles satisfies the above range. The average particle diameter of the particles can be calculated by the following operations (1) to (3).

(1) The writing sheet was photographed through an observation image by an optical microscope. The magnification is preferably 500 to 2000 times.

(2) Select any 10 particles from the observation image, and calculate the particle diameter of each particle. The particle size is measured by sandwiching the cross-section of the particles with any two parallel straight lines, and the distance between the straight lines in the combination of the two straight lines is the largest.

(3) For the observation image of another screen of the same sample, the same operation is performed 5 times, and the value obtained by averaging the number of particle diameters of 50 total amounts is set as the level of the particles in the first resin layer. Average particle size.

Regarding the average particle diameter of the particles of the second resin layer described below, the cross section of the writing sheet was first imaged by TEM or STEM. After the photographing, the same method as (2) and (3) above is carried out, whereby the average particle diameter of the particles of the second resin layer can be calculated. The acceleration voltage of the TEM or STEM is preferably set to 10 kv to 30 kV, and the magnification is preferably set to 50,000 to 300,000 times.

The second resin layer is a layer which makes the unevenness of the first resin layer smooth. Therefore, the second resin layer preferably does not contain particles having an average particle diameter of 0.2 μm or more.

The film thickness of the second resin layer is preferably from 0.01 to 0.15 μm, more preferably from 0.05 to 0.10 μm.

When the second resin layer contains particles, the average particle diameter of the particles is preferably less than 0.2 μm, more preferably 0.01 to 0.2 μm.

The particles of the second resin layer may be the same as the organic particles or inorganic particles exemplified as the particles of the first resin layer. Among these, from the viewpoint of lowering the reflectance, hollow particles are preferred, and hollow cerium oxide is more preferred.

The content of the particles in the second resin layer is preferably from 20 to 60% by mass, more preferably from 30 to 50% by mass, based on the total solid content of the second resin layer.

The resin component of the first resin layer and the second resin layer preferably contains a cured product of a thermosetting resin composition or a free radiation curable resin composition, and more preferably contains a viewpoint of improving mechanical strength. Further, the cured product of the radiation curable resin composition further preferably contains a cured product of the ultraviolet curable resin composition.

The thermosetting resin composition contains at least a composition of a thermosetting resin and is a resin composition which is cured by heating.

Examples of the thermosetting resin include an acrylic resin, a urethane resin, and a phenol system. Resin, urea melamine resin, epoxy resin, unsaturated polyester resin, fluorenone resin, and the like. In the thermosetting resin composition, a curing agent is added to the curable resins as needed.

The composition of the radiation curable resin is a composition of a compound having an epitaxial radiation-curable functional group (hereinafter also referred to as "free radiation curable compound"). Examples of the radical radiation-curable functional group include an ethylenically unsaturated bonding group such as a (meth)acryl fluorenyl group, a vinyl group, and an allyl group, and an epoxy group or an oxetanyl group. The free radiation curable compound is preferably a compound having an ethylenically unsaturated bond group, more preferably a compound having two or more ethylenically unsaturated bond groups, and more preferably two or more. A polyfunctional (meth) acrylate compound having an ethylenically unsaturated bonding group. As the polyfunctional (meth) acrylate type compound, both a monomer and an oligomer can be used.

In addition, the term "free radiation" means an electromagnetic wave or a charged quantum beam having an energy quantum capable of polymerizing or crosslinking a molecule, and generally, ultraviolet (UV) or electron beam (EB) may be used, and X-rays may also be used. Electromagnetic waves such as gamma rays; charged particle beams such as alpha rays and ion beams.

Among the polyfunctional (meth)acrylate compounds, examples of the difunctional (meth)acrylate monomer include ethylene glycol di(meth)acrylate and bisphenol A tetraethoxy diacrylate. , bisphenol A tetrapropoxy diacrylate, 1,6-hexanediol diacrylate, and the like.

Examples of the trifunctional or higher (meth)acrylate monomer include trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, and pentaerythritol IV ( Methyl) acrylate, dipentaerythritol hexa(meth) acrylate, dipentaerythritol tetra(meth) acrylate, iso-cyanuric acid modified tri(meth) acrylate, and the like.

Further, the (meth) acrylate monomer may be one in which a part of the molecular skeleton is modified, and ethylene oxide, propylene oxide, caprolactone, iso-cyanuric acid, or an alkyl group may be used. Cyclic alkyl group, Aromatic, bisphenol and other modified.

Further, examples of the polyfunctional (meth)acrylate-based oligomer include urethane (meth) acrylate, epoxy (meth) acrylate, and polyester (methyl). An acrylate-based polymer such as an acrylate or a polyether (meth) acrylate.

The amine ester (meth) acrylate can be obtained, for example, by a reaction of a polyol and an organic diisocyanate with a hydroxy (meth) acrylate.

Further, a preferred epoxy (meth) acrylate is obtained by reacting a trifunctional or higher aromatic epoxy resin, an alicyclic epoxy resin, an aliphatic epoxy resin, or the like with (meth)acrylic acid. (meth) acrylate; a (meth) acrylate obtained by reacting a difunctional or higher aromatic epoxy resin, an alicyclic epoxy resin, an aliphatic epoxy resin, or the like with a polybasic acid and (meth)acrylic acid; And a (meth) acrylate obtained by reacting a bifunctional or higher aromatic epoxy resin, an alicyclic epoxy resin, or an aliphatic epoxy resin with a phenol or a (meth)acrylic acid.

The above-mentioned free radiation curable compounds may be used alone or in combination of two or more.

When the free radiation curable compound is an ultraviolet curable compound, the free radiation curable composition preferably contains an additive such as a photopolymerization initiator or a photopolymerization accelerator.

The photopolymerization initiator may be selected from the group consisting of acetophenone, benzophenone, α-hydroxyalkylphenone, mischrone, benzoin, benzoin dimethyl ketal, benzhydrazine benzene. Formate, α-mercaptodecyl ester, 9-oxosulfur One or more of the classes.

The photopolymerization initiator preferably has a melting point of 100 ° C or higher. By setting the melting point of the photopolymerization initiator to 100 ° C or higher, the photopolymerization initiator remaining in the process of producing the writing sheet or the transparent conductive film of the touch panel is sublimated, thereby preventing the manufacture. Device or transparent conductive film Pollution.

Further, the photopolymerization accelerator can reduce the polymerization inhibition by air at the time of curing and accelerate the curing rate, and examples thereof include, for example, isoamyl p-dimethylaminophenylbenzoate and p-dimethylaminobenzene. One or more of ethyl formate and the like.

The plastic film can be made of polyester, triacetyl cellulose (TAC), cellulose diacetate, cellulose acetate butyrate, polyamide, polyimine, polyether oxime, polyfluorene, polypropylene, polymethylpentene. It is formed of a resin such as polyvinyl chloride, polyvinyl acetal, polyether ketone, polymethyl methacrylate, polycarbonate, polyurethane, and amorphous olefin (Cyclo-Olefin-Polymer: COP).

In the plastic film, from the viewpoint of mechanical strength or dimensional stability, polyester (polyethylene terephthalate (PET), polynaphthalene) which is subjected to elongation processing, especially biaxial stretching processing is preferred. Ethylene formate (PEN)).

The thickness of the plastic film is preferably from 5 to 200 μm, more preferably from 10 to 150 μm.

The resin layer preferably contains a fluorine-based leveling agent, a polyfluorene-based leveling agent, and a fluoropolyoxy-oxygen copolymer-based leveling agent from the viewpoint of easily satisfying the conditions (A1) and (A2). One or more of the leveling agents.

Further, the content of the leveling agent is preferably from 0.01 to 5% by mass, more preferably from 0.01 to 5% by mass, based on the total surface of the resin layer, from the viewpoint of easily forming the surface satisfying the conditions (A1) and (A2). 0.1 to 3 mass%.

The solvent of the resin layer coating liquid is not particularly limited as long as it is an organic solvent which is usually used. Among these solvents, a ketone solvent is preferred, and methyl ethyl ketone and methyl isobutyl ketone are more preferred. a mixed solvent. When the resin layer is composed of two or more layers, it is preferred to use a ketone solvent as a solvent for the coating liquid of the outermost resin layer. Ketone solvent is easy to balance the smoothness of the surface Since it is in close contact with the underlayer, it is preferable in that it is easy to form a surface satisfying the conditions (A1) and (A2).

The writing sheet of the embodiment A can be used as a writing sheet for a touch panel pen (touch panel pen (A)) having an X of 500 MN/m or less derived from the above formula (i), and the writing feeling can be improved.

When the writing sheet of the embodiment A is used as the writing sheet for the touch panel pen having X of 100 MN/m or less derived from the above formula (i), the writing feeling can be further improved, and the embodiment A can be used. When the writing sheet is a sheet for a touch panel pen of 0.1 MN/m or more and 50 MN/m or less derived from the above formula (i), the writing feeling can be further improved.

The values of the Young's modulus E, the diameter D, and the arithmetic mean height Pa of the touch panel pen (A) are not particularly limited as long as they satisfy the above formula (i), but are preferably substantially in the following range.

The Young's modulus E is preferably 0.001 to 2.5 GPa (1.0 × 10 ⁶ to 2.5 × 10 ⁹ N/m ² ), more preferably 0.002 to 1.7 GPa (2.0 × 10 ⁶ to 1.7 × 10 ⁹ N/m ² ) . The diameter D is preferably from 0.3 to 6.0 mm, more preferably from 0.5 to 2.0 mm. The arithmetic mean height Pa is preferably from 0.01 to 150 μm, more preferably from 1.0 to 120 μm.

Further, the radius of curvature of the tip of the touch panel pen (A) is not particularly limited, and when the radius of curvature is 0.3 to 1.5 mm, it is easier to exert an effect, and when the radius of curvature is 0.5 to 0.8 mm, it is easy to further Play the effect.

[Touch Panel]

The touch panel of the embodiment A has a touch panel on the surface of the touch panel, and the surface of the touch panel pen for the touch panel of the embodiment A that satisfies the conditions (A1) and (A2) is arranged to face the touch. The surface of the panel is made.

As the touch panel, a resistive touch panel, a capacitive touch panel, an in-cell touch panel, an optical touch panel, an ultrasonic touch panel, and an electromagnetic induction touch panel are exemplified.

As shown in FIG. 3, the resistive touch panel 100 is configured such that the conductive film 30 having the pair of transparent substrates 20 on the conductive film 30 is placed opposite to each other with the spacer 40 interposed therebetween. In order to have a basic configuration, a circuit (not shown) is connected to the basic configuration.

In the case of the resistive touch panel, for example, the writing sheet 10 of the embodiment A is used as the upper transparent substrate 20, and the writing sheet 10 satisfies the conditions (A1) and (A2). The surface is used in such a manner as to face the surface of the touch panel 100. Further, although not shown, the resistive touch panel may have a configuration in which the writing sheet of the embodiment A is placed on the upper transparent substrate so that the surface on the side of the conditions (A1) and (A2) faces the surface. Alternatively, the writing piece of the embodiment A is placed on the upper transparent substrate so that the surface on the side of the conditions (A1) and (A2) faces the surface, and is fixed by a frame or the like.

The capacitive touch panel is exemplified by a surface type and a projection type, and a projection type is often used. A projection type capacitive touch panel is obtained by connecting a circuit to a basic configuration in which an X-axis electrode and a Y-axis electrode orthogonal to the X-axis electrode are disposed via an insulator. More specifically, the basic configuration is such that an X-axis electrode and a Y-axis electrode are formed on different surfaces of one transparent substrate, and an X-axis electrode, an insulator layer, and a Y-axis are sequentially formed on the transparent substrate. As shown in FIG. 4, the X-axis electrode 50 is formed on the transparent substrate 20, the Y-axis electrode 60 is formed on the other transparent substrate 20, and the layer is laminated via the insulator layer 70 such as an adhesive layer. Moreover, it can be exemplified in these basic aspects to further laminate another transparent substrate The situation.

In the case of the capacitive touch panel, for example, the writing sheet 10 of the embodiment A is used as the transparent substrate 20 on the front side, and the condition (A1) and (A2) of the writing sheet 10 are satisfied. The side faces are used toward the surface of the touch panel 100. Further, although not shown, the capacitive touch panel may be configured such that the writing sheet of the embodiment A satisfies the surface on the side of the conditions (A1) and (A2) on the transparent substrate on the front side. Alternatively, the writing piece of the embodiment A can be placed on the transparent substrate on the front side so that the surface on the side of the conditions (A1) and (A2) faces the surface, and is fixed by a frame or the like.

The electromagnetic induction type touch panel is a touch panel using a special pen that generates a magnetic field. The electromagnetic induction type touch panel has at least a sensor portion for detecting electromagnetic energy generated from a pen, and further has a transparent substrate on the sensor portion. The transparent substrate may also be composed of a plurality of layers.

In the case of the electromagnetic induction type touch panel, for example, the writing sheet of the embodiment A is used as the transparent substrate on the outermost surface of the transparent substrate on the sensor portion, and the condition of the writing sheet is satisfied ( The faces on the sides of A1) and (A2) are used toward the surface of the touch panel. Alternatively, in the case of the electromagnetic induction type touch panel, the writing piece of the embodiment A can be satisfied on the transparent substrate of the outermost surface of the transparent substrate located on the sensor portion (A1). And the surface on the side of (A2) is bonded to the surface; or on the transparent substrate of the outermost surface, the surface of the writing sheet of the embodiment A is such that the surface on the side of the conditions (A1) and (A2) faces the surface. It is placed and fixed by a frame or the like.

The in-cell touch panel is in which a touch panel function such as a resistive film type, a capacitive type, or an optical type is embedded in a liquid crystal element in which a liquid crystal is sandwiched between two glass substrates.

In the case of an in-cell touch panel, for example, the following configuration is possible: The writing sheet is used by being bonded to the glass substrate on the front side so that the surface on the side of the conditions (A1) and (A2) faces the surface. Further, another layer such as a polarizing plate may be provided between the glass substrate on the front side and the writing sheet in the embodiment A.

[display device]

The display device of Embodiment A is a display device having a touch panel, and the touch panel is the touch panel of Embodiment A.

Examples of the display element include a liquid crystal display element, an EL display element, a plasma display element, an electronic paper element, and an in-cell touch panel liquid crystal display element. In the case where the display element is a liquid crystal display element, an EL display element, a plasma display element, or an electronic paper element, the touch panel of the embodiment A is placed on the display elements.

In the display device of the embodiment A, the writing feeling is improved without excessively damaging the surface, so that the resolution of the display element can be suppressed. In particular, it is preferable in that the resolution of the ultra high definition display element having a pixel density of 300 ppi or more can be suppressed.

[Selection method of writing pad for touch panel pen]

Regarding the picking method of the touch panel pen for the touch panel of the embodiment A, the maximum height roughness Rz _0.8 of JIS B0601:2001 having a cutoff value of 0.8 mm and the maximum valley depth Rv _{0.8 of the} roughness curve, and a cutoff value of 2.5 are selected. JIS B0601: 1994 Partial Peak Interval S _2.5 A sheet satisfying the following conditions (A1) and (A2) is used as a writing sheet for the touch panel pen (A) described below.

0.35≦Rv _0.8 /Rz _0.8 ≦0.60 (A1)

0.05mm≦S _2.5 ≦0.30mm (A2)

<Touch Panel Pen (A)>

The touch panel pen is set to set the apparent Young's modulus of the structure of the pen tip and the shaft constituting the touch panel pen to E, the diameter of the pen tip to D, and the unit measurement interval (0.5 mm) of the pen tip. When the arithmetic mean height of the cross-sectional curve is Pa, the X derived from the following formula (i) is 500 MN/m or less.

X(MN/m)=[E×D×D]/Pa (i)

Regarding the picking method of the touch panel pen for writing in the embodiment A, even if the writing test of the touch panel pen is not performed, the touch panel pen with the X of the above formula (i) of 500 MN/m or less can be selected (touch The writing pen of the panel pen (A)) is excellent in writing, and the product design and quality management of the writing sheet can be efficiently performed. .

The determination conditions for picking the touch panel pen writing sheet are that the above (A1) and (A2) are necessary conditions. The conditions for the determination of the conditions (A1) and (A2) are preferably the preferred numerical ranges of the writing sheet of the above-described embodiment A. For example, the condition for the condition (A1) is preferably 0.37 ≦ Rv _0.8 / Rz _0.8 ≦ 0.58.

The picking method of the touch panel pen for the touch panel of the embodiment A is more preferably the following conditions (A3) from the viewpoint of improving the writing feeling and suppressing the resolution of the display element. One or more of ~(A6) is determined as a determination condition, and it is preferable to set all of (A3) to (A6) as determination conditions.

0.01μm≦Ptm≦1.00μm (A3)

0.01μm≦Ra _0.8 ≦0.50μm (A4)

C _s is 250% or more (A5)

Haze is less than 5.0% (A6)

The condition for the determination of the conditions (A3) to (A6) is preferably the comparison of the writing sheets of the above embodiment A. The range of values is good.

<Embodiment B>

[Touch Panel Pen Writing Tablet]

The touch panel pen for writing in the embodiment B is a writing sheet for the touch panel pen (B) described below, which has a maximum height roughness Rz _0.8 and roughness of JIS B0601:2001 with a cutoff value of 0.8 mm. The maximum mountain height Rp _0.8 of the curve and the skewness Psk of the profile curve in the measurement interval of 1 mm satisfy the surfaces of the following conditions (B1) and (B2), and the haze of JIS K7136:2000 of the writing sheet satisfies the following conditions (B3).

0.50<Rp _0.8 /Rz _0.8 ≦0.75 (B1)

0.60≦Psk (B2)

Haze is less than 5.0% (B3)

<Touch Panel Pen (B)>

The touch panel pen is set to set the apparent Young's modulus of the structure of the pen tip and the shaft constituting the touch panel pen to E, the diameter of the pen tip to D, and the unit measurement interval (0.5 mm) of the pen tip. When the arithmetic mean height of the profile curve is set to Pa, X derived from the following formula (i) exceeds 500 MN/m.

X(MN/m)=[E×D×D]/Pa (i)

Furthermore, the unit of the Young's modulus E is "N/m ² ", the unit of the diameter D of the nib is "m", and the unit of the arithmetic mean height Pa is "m". Also, "M" means "mega(10 ⁶ )".

Fig. 1 is a cross-sectional view showing an embodiment of a touch panel pen writing sheet 10 of the embodiment B. The touch panel pen writing sheet 10 of FIG. 1 has a resin layer 2 on one side of the plastic film 1. The touch panel pen writing sheet 10 of FIG. 2 is a single layer structure of the resin layer 2.

The writing sheet for the touch panel pen of Embodiment B can satisfy the conditions (B1) and (B2) on one surface, or the conditions (B1) and (B2) can be satisfied on both surfaces.

The writing sheet for the touch panel pen according to the embodiment B may be in the form of a single piece, or may be in the form of a roll in which the long piece is wound into a roll.

Hereinafter, there is a case where the writing piece for a touch panel pen is referred to as a "writing sheet". In addition, hereinafter, the surface satisfying the conditions (B1) and (B2) is referred to as a "writing surface".

<writing surface>

The writing sheet for a touch panel pen according to Embodiment B is one in which at least one surface satisfies the conditions (B1) and (B2).

In the embodiment B, the condition (B1) uses a roughness parameter having a cutoff value of 0.8 mm, and on the other hand, the condition (B2) uses a profile parameter. Hereinafter, the reason will be described.

The cut-off value is a value indicating a degree to which the cross-correlation curve composed of the free-roughness component (high-frequency component) and the corrugated component (low-frequency component) cuts the ripple component. In other words, the cutoff value is a value indicating the fineness of the filter which cuts the ripple component (low frequency component) from the profile curve. If the cutoff value is large, the filter is sparse, so the larger ripple component of the ripple component is cut off, but the smaller ripple component is not cut off. On the other hand, if the cutoff value is small, the filter is dense, and thus the ripple component is substantially cut off. That is, the roughness parameter having a small cutoff value has a strong influence on the unevenness of the high-frequency component, and the roughness parameter having a large cutoff value has a strong influence on the unevenness of the low-frequency component. The roughness parameter of the cutoff value of 0.8 mm as the condition (B1) indicates the unevenness of the high frequency component (micro area).

On the other hand, the profile parameter includes irregularities of both the roughness component (high-frequency component) and the ripple component (low-frequency component), and indicates unevenness in a large region.

The inventors of the present invention have made an effort to study the relationship with the writing sense of a writing sheet. It was found that the physical properties of the nib can seriously affect the sense of writing. The physical property of the pen tip here is based on the hardness of the structure of the pen tip and the axis of the touch panel pen (Young's modulus E), the diameter D of the pen tip, and the roughness of the pen tip (the arithmetic mean height Pa of the profile curve of the pen tip) , "X" calculated from the above formula (i). The case where X seriously affects the sense of writing can be explained in the following manner.

First, the Young's modulus E is a basic physical property indicating the easiness of deformation of the nib due to the load, and there is a tendency that the smaller the Young's modulus E is, the more easily the nib is deformed by the load. Then, the square of the diameter D indicates the degree of dispersion load, and there is a tendency that the smaller the square of the diameter D, the more difficult it is to disperse the load, and the pen tip is more likely to be deformed by the load. That is, the case where the "Young's modulus E × diameter D × diameter D" is smaller, the pen tip is more easily deformed, and the pen tip and the writing piece are more easily contacted. Then, the arithmetic mean height Pa of the profile curve of the nib indicates the extent to which the pen tip contacts the writing piece. Specifically, the larger the Pa, the more the pen tip and the writing piece become in point contact, and the contact area between the pen tip and the writing piece becomes smaller. Therefore, the case where the value of "X" calculated from [Young's modulus E × diameter D × diameter D] ÷ Pa is smaller, the easier the pen tip and the writing piece are in close contact with each other, and the writing feeling is greatly affected.

Further, the inventors of the present invention have made an effort to study the relationship between the X value and the writing feeling. As a result, the following (a) and (b) were found.

(a) The tip of the pen is grounded to the surface of the writing blade at the stage of bringing the pen into contact with the writing piece. When the X value is large, the nib is difficult to adhere to the surface of the writing sheet, and therefore it is considered that the writing start is triggered when the nib passes over the convex portion of the high-frequency component (micro area). Therefore, the unevenness of the minute area (roughness parameter of the cutoff value of 0.8 mm) has an influence on the writing feeling at the start of writing.

(b) During the period after the start of writing, the nib moves along the concave surface of the larger area move. Therefore, the influence of the unevenness of a large area on the writing feeling after starting writing becomes large.

As described above, when the X value is large, the unevenness of the minute region (roughness parameter of the cutoff value of 0.8 mm) has an influence on the writing feeling at the time of starting writing. On the other hand, the unevenness (profile parameter) of a large area has a large influence on the writing feeling after starting writing. Therefore, in the embodiment B, the condition (B1) uses a roughness parameter having a cutoff value of 0.8 mm, and the condition (B2) uses a profile parameter.

Furthermore, when writing text or drawing graphics, most of the writing stops writing for a while before writing (for example, when switching the writing direction, the writing is usually stopped for a while. Also, when the writing position is moved, the writing is stopped for a moment). The present inventors have also regarded this type of writing as "beginning writing" immediately after writing.

Condition (B1) is the maximum height roughness Rz _0.8 of JIS B0601:2001 with a cutoff value of 0.8 mm and the maximum mountain height Rp _0.8 of the roughness curve of JIS B0601:2001 with a cutoff value of 0.8 mm satisfying 0.50<Rp _0.8 /Rz _0.8 ≦ 0.75.

The cutoff value of the condition (B1) is 0.8 mm. The condition (B1) is a parameter indicating the unevenness of the high-frequency component and mainly affecting the writing feeling at the time of starting writing.

The Rp _0.8 /Rz _0.8 of the condition (B1) represents the ratio of Rp (the maximum of the mountain height) in Rz (the sum of the mountain height maximum and the valley depth maximum). As described above, the tip of the pen is grounded to the surface of the writing blade at the stage of bringing the pen into contact with the writing piece. When the X value is large, the nib is difficult to adhere to the surface of the writing sheet, so that when the nib passes over the convex portion of the high-frequency component (micro area), the writing starts. Therefore, Rp _0.8 /Rz _0.8 will have a significant impact on the sense of writing when writing starts.

In the embodiment B, by setting Rp _0.8 /Rz _0.8 within the above range, the frictional resistance of the nib at the time of starting writing becomes appropriate, and the writing feeling at the time of starting writing can be improved. Further, by setting Rp _0.8 /Rz _0.8 within the above range, the pen can be easily stopped on the surface of the writing sheet.

On the other hand, when Rp _0.8 /Rz _0.8 is 0.50 or less, since the ratio of the mountain is too small, the frictional resistance is small and becomes a smooth feeling, and the writing feeling at the start of writing cannot be made good. Further, when Rp _0.8 /Rz _0.8 is 0.50 or less, it is difficult to make the pen stand still at the end of writing. Further, when Rp _0.8 /Rz _0.8 exceeds 0.75, the ratio of the mountain is too large, so that the feeling of being stuck becomes strong, and the writing feeling at the start of writing cannot be made good.

The condition (B1) preferably satisfies 0.53 ≦ Rp _0.8 / Rz _0.8 ≦ 0.70, more preferably satisfies 0.58 ≦ Rp _0.8 / Rz _0.8 ≦ 0.65.

In addition, Rp _0.8 and Rz _{0.8 which} are the basis of the calculation condition (B1) are the average values when the measurement is performed once for each of the 20 samples. Further, the following Psk, Ptm, S _2.5, and Ra _0.8 , transmission clarity, and haze were also average values when the measurement was performed once for each of the 20 samples.

The condition (B2) requires that the skewness Psk of the profile curve in the measurement section of 1 mm is 0.60 or more. Psk is a parameter including a cross-sectional shape of both a roughness component (high-frequency component) and a corrugation component (low-frequency component), and indicates a large-area unevenness.

Psk is a parameter about the probability density of bumps. If the condition (B2) is not satisfied, it means that if the Psk is small, the proportion of the convex portion in the unevenness of the larger area is high. When the ratio of the convex portions in the unevenness of the larger region is high, the nib does not advance along the concavities and convexities, but moves toward the apex of the convex portions, and the frictional resistance is lowered. Therefore, when the condition (B2) is not satisfied, the frictional resistance after the start of writing is lowered to become a smooth feeling.

On the other hand, if the condition (B2) is satisfied and Psk is large, it means that the ratio of the concave portion in the uneven portion of the larger region is high. In this case, since the nib advances along the unevenness of the larger area, moderate frictional resistance is imparted.

Psk applies the skewness Rsk of the roughness curve of JIS B0601:2001 to the profile curve. The winner can be calculated by the same formula as Rsk.

Further, the reason why the parameter obtained by applying the condition (B1) of Rp _0.8 /Rz _0.8 to the profile curve is not used as the profile parameter of the condition (B2) is that, as for the profile parameter, since the region is large, it is such as Rp The parameter of the maximum value in the use area of _0.8 / Rz _0.8 is that the error of each measurement area is too large, and the reliability as a parameter becomes low.

The condition (B2) preferably satisfies 0.80 ≦ Psk, and more preferably satisfies 0.90 ≦ Psk.

Further, when the Psk is too large, the antiglare property tends to be deteriorated. Therefore, Psk is preferably 5.00 or less, more preferably 3.00 or less, still more preferably 2.00 or less.

<Haze>

The haze of the touch panel pen for the touch panel of the embodiment B is JIS K7136:2000, which satisfies the following condition (B3).

Haze is 5.0% or more (B3)

By satisfying the condition (B3) and satisfying the above conditions (B1) and (B2), the anti-glare property and the writing feeling can be improved.

The haze is preferably 10.0% or more, more preferably 15.0% or more. Furthermore, if the haze is too high, the resolution of the display element is greatly reduced. Therefore, the haze is preferably 40.0% or less, more preferably 30.0% or less.

When measuring the haze and the transmission image clarity described below, light is incident from the surface of the writing sheet opposite to the writing surface. When the two surfaces of the writing sheet satisfy the above conditions (B1) and (B2), the light incident surface may be either surface.

Further, in the writing sheet of the embodiment B, it is preferable to set the unit measurement section to 1 mm, and to set the maximum value of the mountain height of the section curve in the unit measurement section to Pp, and to measure the unit measurement section. The maximum valley depth of the profile curve in the middle is set to Pv, and the sum of Pp and Pv is set as the maximum profile height Pt of the profile curve in the unit measurement section, and when the average value of Pt of the five measurement sections is set to Ptm, writing The Ptm of the surface satisfies the following condition (B4).

0.30μm≦Ptm≦7.00μm (B4)

Further, the mountain height maximum value Pp of the profile curve in the unit measurement section is defined as a portion above the elevation average line of the unit measurement section, indicating the height of the highest mountain. Further, the valley depth maximum value Pv of the profile curve in the unit measurement section is defined as a valley which is located below the elevation line of the unit measurement section, and indicates the depth of the deepest valley.

As described above, the unevenness of the larger area has a greater influence on the writing feeling after the start of writing. The condition (B4) is expressed in the unevenness of the larger area, and the elevation difference is not too small and is not excessive. Therefore, by setting the condition (B4) to the above range, the writing feeling from the start of writing to the end of writing can be made better.

The condition (B4) more preferably satisfies 0.50 μm ≦ Ptm ≦ 5.00 μm, and further preferably satisfies 1.00 μm ≦ Ptm ≦ 4.00 μm.

Further, Form B of Embodiment writing sheet in the preferred cutoff value of 2.5mm JIS B0601: 1994 is set to the average spacing of local Peak _2.5 S, S _2.5 of the writing surface satisfies the following condition (B5).

0.02mm≦S _2.5 ≦0.20mm (B5)

The cutoff value of condition (B5) is 2.5 mm. The condition (B5) is a parameter indicating the unevenness of the low-frequency component and mainly affecting the writing feeling after the start of writing. By satisfying the condition (B5), the frictional resistance after the start of writing becomes appropriate, and the writing feeling after the start of writing can be made better.

The condition (B5) more preferably satisfies 0.02 mm ≦ S _2.5 ≦ 0.15 mm, and further preferably satisfies 0.03 mm ≦ S _2.5 ≦ 0.15 mm.

Further, if S _2.5 to 0.20mm or less, it is also preferred to improve the aspect of the antiglare property.

Further, the writing surface of the writing sheet of the embodiment B preferably has an arithmetic mean roughness Ra _0.8 of JIS B0601:2001 having a cutoff value of 0.8 mm, which satisfies the following condition (B6).

0.10μm≦Ra _0.8 ≦0.25μm (B6)

By setting Ra _0.8 to the above range, the writing feeling can be made better. Moreover, by setting Ra _0.8 to 0.10 μm or more, the anti-glare property can be easily improved. Further, by setting Ra _0.8 to 0.25 μm or less, it is possible to suppress the resolution of the display element from being greatly lowered by the writing sheet.

The condition (B6) is more preferably 0.10 μm ≦Ra _0.8 ≦0.20 μm, further preferably 0.13 μm ≦Ra _0.8 ≦0.17 μm.

Further, in the writing surface of the writing sheet of the embodiment B, it is preferable that the ten-point average roughness Rz _JIS0.8 of JIS B0601:2001 having a cutoff value of 0.8 mm satisfies the following condition (B7).

_0.50μm ≦Rz _JIS0.8 ≦ _1.50μm (B7)

By setting Rz _JIS0.8 to the above range, the writing feeling can be made better. Moreover, by setting Rz _JIS0.8 to 0.50 μm or more, the anti-glare property can be easily improved. Further, by setting Rz _JIS0.8 to 1.50 _μm or less, it is possible to suppress the resolution of the display element from being greatly lowered by the writing sheet. In particular, it is preferable in that the resolution of the ultra high definition display element having a pixel density of 300 ppi or more can be suppressed.

The condition (B7) is more preferably 0.50 μm ≦ Rz _{JIS 0.8} ≦ 1.25 μm, further preferably 0.60 μm ≦ Rz _{JIS 0.8} ≦ _1.00 μm.

Further, the writing sheet of the embodiment B is preferably such that the touch panel pen (B) is The angle of 60 degrees is fixed in contact with the writing surface, and a vertical load of 100 gf is applied to the touch panel pen (B) while scanning the length of one-way 40 mm at a speed of 14 mm/sec, and this time acts on the touch panel pen. (B) The dynamic friction coefficient in the scanning direction is set to μk, and when the static friction coefficient is set to μs, the relationship of 0.30 ≦μk/μs ≦ 0.58 is satisfied. Further, in the embodiment B, the dynamic friction coefficient μk means the average value of the dynamic friction coefficients of all the measurement times. The static friction coefficient is set to be the peak value of the initial frictional force equal to or higher than the dynamic friction coefficient as the measurement time elapses from the frictional force 0. The measurement interval of the coefficient of friction is preferably set to 0.02 seconds.

When writing text or drawing graphics, most of them stop writing for a while before starting to write (for example, when switching the writing direction, usually stop writing for a moment. Also, when writing the writing position, the writing will stop writing for a moment). When writing is stopped as soon as the writing is started as described above, it is easily affected by the difference between the static friction coefficient and the dynamic friction coefficient. However, by setting μk/μs to the above range, it is possible to realize writing even after stopping writing for a while. Imagine writing (for example, you can change the direction of writing to the direction you want).

In order to satisfy the relationship of 0.30 ≦μk/μs ≦ 0.58, it is preferable to satisfy the above conditions (B1) and (B2), and it is better to satisfy one of the conditions (B4) to (B7) in addition to the above conditions (B1) and (B2). More preferably, the above conditions (B1), (B2), and (B4) to (B7) are satisfied.

Further, in order to make the above effects more favorable, μk/μs more preferably satisfies the relationship of 0.30 ≦ μk/μs ≦ 0.44.

The μk/μs is a value obtained by measuring μk/μs of each sample for each of 20 samples and averaging μk/μs of 20 samples.

Furthermore, even when the touch panel pen is fixed in a state of contacting the writing surface at an angle other than 60 degrees (for example, an arbitrary angle in the range of 30 to 75 degrees), it is preferably μk. /μs is the above range. Further, even when the scanning speed is set to a speed other than 14 mm/sec (for example, an arbitrary speed in the range of 0.1 to 100 mm/sec), it is preferable that μk/μs is in the above range.

Further, from the viewpoint of not being excessively smooth and obtaining a moderate feeling of resistance, μk and μs are preferably in the following ranges. The μk is preferably from 0.06 to 0.30, more preferably from 0.08 to 0.28, still more preferably from 0.08 to 0.20. The μs is preferably from 0.15 to 0.95, more preferably from 0.20 to 0.60, still more preferably from 0.25 to 0.50.

Μk and μs can be measured by the same method as that described in the embodiment A.

Also, the arithmetic mean height Pa of the profile curve in the apparent Young's modulus E of the structure of the touch panel pen and the axis structure, the diameter D of the nib, and the unit measurement section (0.5 mm) of the nib The measurement can be carried out in the same manner as the method described in the embodiment A.

Further, the writing sheet of the embodiment B is preferably such that the width of the optical frequency comb of the image resolution measuring device measured according to JIS K7374:2007 is 0.125 mm, 0.5 mm, 1.0 mm, and 2.0 mm. When the degree is C _0.125 , C _0.5 , C _1.0 and C _2.0 , the sum C _s of C _0.125 , C _0.5 , C _1.0 and C _2.0 is 100% or more and less than 250%, more preferably 120% or more and 230%. Hereinafter, it is more preferably 150% or more and 200% or less.

By setting C _s to 100% or more, the resolution of the display element can be suppressed from being greatly reduced by the writing sheet. Further, by setting C _s to less than 250%, the means for imparting anti-glare property is not limited, and the product design can be easily performed.

<Structure of the whole writing sheet>

In the touch panel pen for writing of the embodiment B, the configuration is not particularly limited as long as at least one surface satisfies the conditions (B1) and (B2).

For example, the configuration of the touch panel pen writing sheet 10 of the embodiment B includes a resin layer 2 as shown in FIGS. 1 and 2, and one surface of the resin layer 2 satisfies the conditions (B1) and (B2). .

Further, although not shown, other layers than the resin layer or the plastic film may be provided, and the surfaces of the other layers satisfy the conditions (B1) and (B2). Examples of the other layer include an antistatic layer, an antifouling layer, and the like. Further, although not shown, the resin layer may be composed of two or more layers.

The surface (writing surface) satisfying the conditions (B1) and (B2) can be formed by (a) physical or chemical treatment such as embossing, sand blasting, etching, (b) molding by a mold, (c) coating, or the like. Among these methods, from the viewpoint of the reproducibility of the surface shape, it is preferable that the molding of the mold (b) is carried out, and the coating of (c) is preferable from the viewpoint of productivity and a plurality of types.

By molding the mold, a material formed of a shape complementary to the shape satisfying the conditions (B1) and (B2) can be formed, and a material forming the resin layer can be poured into the mold and then taken out from the mold. Here, if a material constituting the resin layer is used as the material, the material is poured into the mold, the plastic film is superposed, and the resin layer is taken out from the mold together with the plastic film, and a resin layer is obtained on the plastic film, and The surface of the resin layer satisfies the writing sheet for a touch panel pen of the conditions (B1) and (B2). Further, the resin layer is directly taken out from the mold without using a plastic film, or the plastic film is taken out from the mold and the plastic film is peeled off, whereby a single layer of the resin layer can be obtained, and the surface of the resin layer satisfies the condition (B1) And (B2) the touch panel pen for writing.

When a curable resin composition (thermosetting resin composition or free radiation curable resin composition) is used as the material flowing into the mold, it is preferred to cure the curable resin composition before taking out from the mold.

The resin layer forming coating liquid containing the resin component, the particles, and the solvent can be applied to the plastic film by a known coating method such as gravure coating or bar coating. It is formed by drying and hardening. In order to satisfy the above conditions for the surface shape of the resin layer formed by coating, it is preferred to use micron-sized particles and nano-sized inorganic ultrafine particles as particles, and to increase the film thickness, the content of the particles, and the average particle diameter of the particles. Set to the following range.

The film thickness of the resin layer is preferably from 1.5 to 10 μm, more preferably from 2 to 8 μm, still more preferably from 4 to 7 μm. The film thickness of the resin layer can be measured, for example, at a thickness of 20 points according to an image of a cross section taken using a transmission electron microscope (TEM) or a scanning transmission electron microscope (STEM), and is based on an average value of 20 points. And calculate. The acceleration voltage of the TEM or STEM is preferably set to 10 to 30 kV, and the magnification is preferably set to 50,000 to 300,000 times.

Any of the organic particles and the inorganic particles can be used as the particles (micron particles) of the resin layer. Examples of the organic particles include polymethyl methacrylate, polyacrylic acid-styrene copolymer, melamine resin, polycarbonate, polystyrene, polyvinyl chloride, benzoguanamine-melamine-formaldehyde condensate, and polyfluorene. Particles composed of oxygen, a fluorine resin, a polyester resin, or the like. Examples of the inorganic particles include particles composed of ceria, alumina, cerium, zirconia, and titania. Among these particles, organic particles are preferred from the viewpoint of easiness of dispersion control.

The content of the particles (micron-sized particles) in the resin layer is preferably from 2 to 25% by mass, more preferably from 5 to 20% by mass, even more preferably from 10 to 15% by mass, based on the total solid content of the resin layer.

The average particle diameter of the particles (micron-sized particles) in the resin layer is preferably 0.2 to 8.0 μm, more preferably 0.3 to 7.0 μm, still more preferably 0.5 to 5.0 μm. In the case of particle agglutination Preferably, the average particle diameter of the aggregated particles satisfies the above range. The average particle diameter of the particles can be calculated by the same method as in the embodiment A.

The film thickness of the resin layer is preferably larger than the average particle diameter of the particles from the viewpoint that the surface shape of the writing sheet is easily in the above range. Specifically, the ratio of [average particle diameter of particles] / [film thickness of resin layer] is preferably 0.40 to 0.80, more preferably 0.45 to 0.75, still more preferably 0.50 to 0.70.

Further, as the particles, it is preferred to contain not only the above-described micron-sized particles but also nano-sized inorganic ultrafine particles. By containing nano-sized inorganic ultrafine particles, the surface shape of the resin layer can be easily made into the above range. The reason for this is that the irregularities of the high-frequency component (the irregularities of the minute regions) are formed by the micron-sized particles, and on the other hand, when the inorganic ultrafine particles are contained, the micron-sized particles are formed in a relatively gentle manner. When it is inclined, the unevenness of the low-frequency component (concavity and convexity of a large area) is formed, and as a result, a shape in which the unevenness of the high-frequency component and the unevenness of the low-frequency component are mixed are formed. In the case of containing inorganic ultrafine particles, the thixotropic properties of the coating liquid and the drying characteristics of the solvent are affected without causing normal leveling, thus causing the phenomenon as described above.

Further, by containing the inorganic ultrafine particles, a gentle slope is formed in the absence of the micron-sized particles, and as a result (the result of a substantially smooth portion is reduced), the antiglare property can be improved.

Examples of the inorganic ultrafine particles include ultrafine particles composed of ceria, alumina, zirconia, and titania. Among these, from the viewpoint of transparency, cerium oxide ultrafine particles are preferred.

The inorganic ultrafine particles preferably have an average primary particle diameter of from 1 to 25 nm, more preferably from 5 to 20 nm, from the viewpoint of easily obtaining the above-mentioned uneven shape.

The inorganic ultrafine particles are preferably introduced by a surface treatment with a reactive group Inorganic inorganic ultrafine particles. By introducing a reactive group, a large amount of inorganic ultrafine particles can be contained in the resin layer, and the surface shape of the writing sheet can be easily made into the above range.

As the reactive group, a polymerizable unsaturated group can be preferably used, preferably a photocurable unsaturated group, and particularly preferably an free radiation curable unsaturated group. Specific examples thereof include an ethylenically unsaturated bond such as a (meth)acrylonitrile group, a (meth)acryloxy group, a vinyl group, and an allyl group, and an epoxy group.

Examples of such reactive inorganic ultrafine particles include inorganic ultrafine particles surface-treated with a decane coupling agent. When the surface of the inorganic ultrafine particles is treated with a decane coupling agent, a dry method in which a decane coupling agent is sprayed onto the inorganic ultrafine particles is used, or the inorganic ultrafine particles are dispersed in a solvent, and then a decane coupling agent is added to cause a reaction. Wet method, etc.

The content of the inorganic ultrafine particles is preferably from 1 to 20% by mass, more preferably from 2 to 15% by mass, even more preferably from 3 to 10% by mass, based on the total solid content of the resin layer. By setting it as this range, it is easy to make the surface shape of a writing sheet into the said range by the control of a leveling property, and suppression of the polymerization shrinkage of a resin layer.

Further, the ratio of the content of the micron-sized particles and the inorganic ultrafine particles in the resin layer (the content of the micron-sized particles/the content of the inorganic ultrafine particles) is preferably from the viewpoint that the surface shape of the writing sheet is in the above range. It is 1.0~3.0, more preferably 1.5~2.5.

The resin component of the resin layer preferably contains a cured product of a thermosetting resin composition or a free radiation curable resin composition, and more preferably contains a free radiation curable resin composition from the viewpoint of improving mechanical strength. The cured product further preferably contains a cured product of the ultraviolet curable resin composition.

The thermosetting resin composition contains at least a composition of a thermosetting resin, and A resin composition which is hardened by heating.

Examples of the thermosetting resin include an acrylic resin, a urethane resin, a phenol resin, a urea melamine resin, an epoxy resin, an unsaturated polyester resin, and an anthrone resin. In the thermosetting resin composition, a curing agent is added to the curable resins as needed.

The composition of the radiation curable resin is a composition of a compound having an epitaxial radiation-curable functional group (hereinafter also referred to as "free radiation curable compound"). Examples of the radical radiation-curable functional group include an ethylenically unsaturated bonding group such as a (meth)acryl fluorenyl group, a vinyl group, and an allyl group, and an epoxy group or an oxetanyl group. The free radiation curable compound is preferably a compound having an ethylenically unsaturated bond group, more preferably a compound having two or more ethylenically unsaturated bond groups, and more preferably two or more. A polyfunctional (meth) acrylate compound having an ethylenically unsaturated bonding group. As the polyfunctional (meth) acrylate type compound, both a monomer and an oligomer can be used.

In addition, the term "free radiation" means an electromagnetic wave or a charged quantum beam having an energy quantum capable of polymerizing or crosslinking a molecule, and generally, ultraviolet (UV) or electron beam (EB) may be used, and X-rays may also be used. Electromagnetic waves such as gamma rays; charged particle beams such as alpha rays and ion beams.

Among the polyfunctional (meth)acrylate compounds, examples of the difunctional (meth)acrylate monomer include ethylene glycol di(meth)acrylate and bisphenol A tetraethoxy diacrylate. , bisphenol A tetrapropoxy diacrylate, 1,6-hexanediol diacrylate, and the like.

Examples of the trifunctional or higher (meth)acrylate monomer include trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, and pentaerythritol IV ( Methyl) acrylate, dipentaerythritol hexa(meth) acrylate, dipentaerythritol tetra(meth) acrylate, iso-cyanuric acid modified tri(meth) acrylate, and the like.

Further, the (meth) acrylate monomer may be one in which a part of the molecular skeleton is modified, and ethylene oxide, propylene oxide, caprolactone, iso-cyanuric acid, or an alkyl group may be used. It is a modified one of a cyclic alkyl group, an aromatic group, and a bisphenol.

Moreover, examples of the polyfunctional (meth)acrylate-based oligomer include an amine ester (meth)acrylate, an epoxy (meth)acrylate, a polyester (meth)acrylate, and a polyether ( An acrylate polymer such as a methyl acrylate.

The amine ester (meth) acrylate can be obtained, for example, by a reaction of a polyol and an organic diisocyanate with a hydroxy (meth) acrylate.

Further, a preferred epoxy (meth) acrylate is obtained by reacting a trifunctional or higher aromatic epoxy resin, an alicyclic epoxy resin, an aliphatic epoxy resin, or the like with (meth)acrylic acid. (meth) acrylate; a (meth) acrylate obtained by reacting a difunctional or higher aromatic epoxy resin, an alicyclic epoxy resin, an aliphatic epoxy resin, or the like with a polybasic acid and (meth)acrylic acid; And a (meth) acrylate obtained by reacting a bifunctional or higher aromatic epoxy resin, an alicyclic epoxy resin, or an aliphatic epoxy resin with a phenol or a (meth)acrylic acid.

The above-mentioned free radiation curable compounds may be used alone or in combination of two or more.

When the free radiation curable compound is an ultraviolet curable compound, the free radiation curable composition preferably contains an additive such as a photopolymerization initiator or a photopolymerization accelerator.

The photopolymerization initiator may be selected from the group consisting of acetophenone, benzophenone, α-hydroxyalkylphenone, mischrone, benzoin, benzoin dimethyl ketal, benzhydrazine benzene. Formate, α-mercaptodecyl ester, 9-oxosulfur One or more of the classes.

The photopolymerization initiator preferably has a melting point of 100 ° C or higher. By melting the photopolymerization initiator When the dot is set to 100 ° C or more, the photopolymerization initiator remaining in the process of forming the writing sheet or the transparent conductive film of the touch panel is sublimated, and contamination of the manufacturing apparatus or the transparent conductive film can be prevented.

Further, the photopolymerization accelerator can reduce the polymerization inhibition by air at the time of curing and accelerate the curing rate, and examples thereof include, for example, isoamyl p-dimethylaminophenylbenzoate and p-dimethylaminobenzene. One or more of ethyl formate and the like.

In the resin layer forming coating liquid, a solvent is usually used in order to adjust the viscosity or to dissolve or disperse each component. Depending on the type of the solvent, the surface state of the resin layer after the coating and drying process is different. Therefore, it is preferred to select a solvent in consideration of the saturated vapor pressure of the solvent, the permeability of the solvent to the transparent substrate, and the like. Specifically, examples of the solvent include ketones (acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, etc.) and ethers (two). Alkane, tetrahydrofuran, etc., aliphatic hydrocarbons (such as hexane), alicyclic hydrocarbons (such as cyclohexane), aromatic hydrocarbons (such as toluene and xylene), and halogenated carbons (dichloromethane and dichloroethylene) Ethane, etc., esters (methyl acetate, ethyl acetate, butyl acetate, etc.), alcohols (butanol, cyclohexanol, etc.), cellosolve (methyl cellosolve, ethyl cellosolve) And so on, cellulose cellosolve, sulfonium (dimethyl hydrazine, etc.), guanamine (dimethylformamide, dimethylacetamide, etc.), etc., may also be a mixture of these.

When the drying of the solvent is too slow, the leveling property of the resin layer may become excessive, and thus it becomes difficult to form the above-described surface shape. Therefore, the solvent preferably contains a solvent having a vaporization rate of 50% by mass or more in all the solvents (relative evaporation rate when the evaporation rate of n-butyl acetate is 100), and more preferably 60% by mass or more. . The solvent having a relative evaporation rate of 180 or more is, for example, toluene. The relative evaporation rate of toluene was 195.

Moreover, the surface shape is moderately smooth, and the surface shape of the writing piece is easily made From the viewpoint of the above range, it is preferred to contain a leveling agent in the coating layer forming coating liquid. The leveling agent may, for example, be a fluorine-based leveling agent, a polyfluorene-based leveling agent, a fluoropolyoxy-oxygen copolymer-based leveling agent, or the like, and is preferably a polyfluorene-based leveling agent. The amount of the leveling agent to be added is preferably 0.01 to 0.5% by weight, and more preferably 0.01 to 0.2% by weight based on the total solid content of the coating layer of the resin layer.

The plastic film can be made of polyester, triacetyl cellulose (TAC), cellulose diacetate, cellulose acetate butyrate, polyamide, polyimine, polyether oxime, polyfluorene, polypropylene, polymethylpentene. It is formed of a resin such as polyvinyl chloride, polyvinyl acetal, polyether ketone, polymethyl methacrylate, polycarbonate, polycarbonate, and amorphous olefin (Cyclo-Olefin-Polymer: COP).

In the plastic film, from the viewpoint of mechanical strength or dimensional stability, polyester (polyethylene terephthalate or polyethylene naphthalate) which is subjected to elongation processing, especially biaxial stretching processing, is preferred. ester).

The thickness of the plastic film is preferably from 5 to 200 μm, more preferably from 10 to 150 μm.

The writing sheet of the embodiment B can be made to have a good writing feeling by using a writing sheet for a touch panel pen (touch panel pen (B)) having an X of more than 500 MN/m derived from the above formula (i).

When the writing sheet of the embodiment B is used as the writing sheet for the touch panel pen having a length of 1,000 MN/m or more derived from the above formula (i), the writing feeling can be further improved, and the writing can be used as described above. When the X derived from the formula (i) is a sheet for a touch panel pen of 2,000 MN/m or more and 100,000 MN/m or less, the writing feeling can be further improved.

The respective values of the Young's modulus E, the diameter D, and the arithmetic mean height Pa of the touch panel pen (B) are not particularly limited as long as they satisfy the above formula (i), but are preferably substantially in the following range.

The Young's modulus is preferably 0.1 to 5.0 GPa (1.0 × 10 ⁸ to 5.0 × 10 ⁹ N/m ² ), more preferably 0.5 to 2.5 GPa (5.0 × 10 ⁸ to 2.5 × 10 ⁹ N/m ² ). The diameter D is preferably from 0.3 to 6.0 mm, more preferably from 0.4 to 2.5 mm. The arithmetic mean height Pa is preferably from 0.01 to 10 μm, more preferably from 0.05 to 1.0 μm.

Further, the radius of curvature of the tip of the touch panel pen (B) is not particularly limited, and when the radius of curvature is 0.3 to 1.5 mm, it is easier to exert an effect, and when the radius of curvature is 0.5 to 0.8 mm, it is easy to further Play the effect.

[Touch Panel]

The touch panel of the embodiment B has a touch panel on the surface of the touch panel, and the surface of the touch panel pen writing sheet of the embodiment B that satisfies the conditions (B1) and (B2) is configured to face the touch. The surface of the panel is made.

As the touch panel, a resistive touch panel, a capacitive touch panel, an in-cell touch panel, an optical touch panel, an ultrasonic touch panel, and an electromagnetic induction touch panel are exemplified.

As shown in FIG. 3, the resistive touch panel 100 is configured such that the conductive film 30 having the pair of transparent substrates 20 on the conductive film 30 is placed opposite to each other with the spacer 40 interposed therebetween. In order to have a basic configuration, a circuit (not shown) is connected to the basic configuration.

In the case of the resistive touch panel, for example, the writing sheet 10 of the embodiment B is used as the upper transparent substrate 20, and the writing sheets 10 satisfy the conditions (B1) and (B2). The surface is used in such a manner as to face the surface of the touch panel 100. Further, although not shown, the resistive touch panel may have a configuration in which the writing piece of the embodiment B is placed on the upper transparent substrate so that the surface on the side of the conditions (B1) and (B2) faces the surface. Bonding; or forming the writing piece of the embodiment B on the upper transparent substrate to satisfy the side of the condition (B1) and (B2) The surface is placed on the surface and fixed by a frame or the like.

The capacitive touch panel is exemplified by a surface type and a projection type, and a projection type is often used. A projection type capacitive touch panel is obtained by connecting a circuit to a basic configuration in which an X-axis electrode and a Y-axis electrode orthogonal to the X-axis electrode are disposed via an insulator. More specifically, the basic configuration is such that an X-axis electrode and a Y-axis electrode are formed on different surfaces of one transparent substrate, and an X-axis electrode, an insulator layer, and a Y-axis are sequentially formed on the transparent substrate. As shown in FIG. 4, the X-axis electrode 50 is formed on the transparent substrate 20, the Y-axis electrode 60 is formed on the other transparent substrate 20, and the layer is laminated via the insulator layer 70 such as an adhesive layer. Moreover, the aspect in which another transparent substrate is laminated in these basic aspects is mentioned.

In the case of the capacitive touch panel, for example, the writing sheet 10 of the embodiment B is used as the transparent substrate 20 on the front side, and the conditions (B1) and (B2) of the writing sheet 10 are satisfied. The side faces are used toward the surface of the touch panel 100. Further, although not shown, the capacitive touch panel may be configured such that the writing sheet of the embodiment B satisfies the surface on the side of the conditions (B1) and (B2) on the transparent substrate on the front side. Alternatively, the writing piece of the embodiment B may be placed on the transparent substrate on the front side so that the surface on the side of the conditions (B1) and (B2) faces the surface, and is fixed by a frame or the like.

The electromagnetic induction type touch panel is a touch panel using a special pen that generates a magnetic field. The electromagnetic induction type touch panel has at least a sensor portion for detecting electromagnetic energy generated from a pen, and further has a transparent substrate on the sensor portion. The transparent substrate may also be composed of a plurality of layers.

In the case of the electromagnetic induction type touch panel, for example, a configuration in which the writing sheet of the embodiment B is used as the outermost surface of the transparent substrate on the sensor portion is used, and The surface of the writing sheet that satisfies the conditions (B1) and (B2) faces the surface of the touch panel. Alternatively, in the case of the electromagnetic induction type touch panel, the writing piece of the embodiment B may be satisfied on the transparent substrate on the outermost surface of the transparent substrate located on the sensor portion (B1). And the surface on the side of (B2) is attached to the surface; or on the transparent substrate of the outermost surface, the surface of the writing sheet of Embodiment B is set to face the surface on the side of the conditions (B1) and (B2). It is placed and fixed by a frame or the like.

The in-cell touch panel is in which a touch panel function such as a resistive film type, a capacitive type, or an optical type is embedded in a liquid crystal element in which a liquid crystal is sandwiched between two glass substrates.

In the case of the in-cell type touch panel, for example, a configuration is given in which the writing sheet of the embodiment B is attached to the glass substrate of the embodiment B so that the surface on the side of the conditions (B1) and (B2) faces the surface. Used together. Further, another layer such as a polarizing plate may be provided between the glass substrate on the front side and the writing sheet in the embodiment B.

[display device]

The display device of the embodiment B is a display device having a touch panel, and the touch panel is the touch panel of the embodiment B.

Examples of the display element include a liquid crystal display element, an EL display element, a plasma display element, an electronic paper element, and an in-cell touch panel liquid crystal display element. In the case where the display element is a liquid crystal display element, an EL display element, a plasma display element, or an electronic paper element, the touch panel of Embodiment B is placed on the display elements.

In the display device of the embodiment B, since the writing feeling is improved without excessively damaging the surface, it is possible to suppress a situation in which the resolution of the display element is greatly impaired.

[Selection method of writing pad for touch panel pen]

Regarding the picking method of the touch panel pen for the touch panel of the embodiment B, the maximum height roughness Rz _0.8 of JIS B0601:2001 having a cutoff value of 0.8 mm and the maximum mountain height Rp _{0.8 of the} roughness curve are selected, and the measurement interval is 1 mm. The skewness Psk of the profile curve satisfies the surfaces of the following conditions (B1) and (B2), and the sheet of the JIS K7136:2000 having the haze satisfying the following condition (B3) is used as the touch panel pen (B) described below. Use a writing tablet.

0.50<Rp _0.8 /Rz _0.8 ≦0.75 (B1)

0.60≦Psk (B2)

Haze is 5.0% or more (B3)

<Touch Panel Pen (B)>

The touch panel pen is set to set the apparent Young's modulus of the structure of the pen tip and the shaft constituting the touch panel pen to E, the diameter of the pen tip to D, and the unit measurement interval (0.5 mm) of the pen tip. When the arithmetic mean height of the profile curve is set to Pa, X derived from the following formula (i) exceeds 500 MN/m.

X(MN/m)=[E×D×D]/Pa (i)

Regarding the picking method of the touch panel pen for the touch panel of Embodiment B, even if the writing test of the touch panel pen is not performed, the touch panel pen (touch panel) in which the X of the above formula (i) exceeds 500 MN/m can be selected. The pen (B)) has a good writing feeling and a writing sheet excellent in anti-glare property, and can efficiently perform product design and quality management of the writing sheet.

The determination conditions for picking the touch panel pen writing sheet are that the above (B1) to (B3) are necessary conditions. The condition for the determination of the conditions (B1) to (B3) is preferably a preferred numerical range of the writing sheet of the above-described embodiment B. For example, the condition (B1) is preferably determined to be 0.53 ≦ Rp _0.8 / Rz _0.8 ≦ 0.70, more preferably 0.58 ≦ Rp _0.8 / Rz _0.8 ≦ 0.65.

In the method of picking a touch panel for a touch panel pen according to the embodiment B, the viewpoint of improving the writing feeling is improved, the anti-glare property is further improved, and the resolution of the display element is suppressed from being lowered. In addition, it is more preferable to set one or more of the conditions (B4) to (B8) listed below as the determination condition, and it is preferable to set all of (B4) to (B8) as the determination conditions.

0.30μm≦Ptm≦7.00μm (B4)

0.02mm≦S _2.5 ≦0.20mm (B5)

0.10μm≦Ra _0.8 ≦0.25μm (B6)

_0.50μm ≦Rz _JIS0.8 ≦ _1.50μm (B7)

C _s is 100% or more and less than 250% (B8)

The condition for the determination of the conditions (B4) to (B8) is preferably a preferred numerical range of the writing sheet of the above-described embodiment B.

<Embodiment C>

[Selection method of writing pad for touch panel pen]

In the picking method of the touch panel pen for writing in the embodiment C, the following condition (C1) is selected as the touch panel pen writing sheet.

<condition (C1)>

The touch panel pen is fixed in a state of contacting the surface of the touch panel pen with a writing angle of 60 degrees, and a vertical load of 100 gf is applied to the touch panel pen to scan a length of one step of 40 mm at a speed of 14 mm/sec. The dynamic friction coefficient acting in the scanning direction of the touch panel pen at this time is μk, and when the static friction coefficient is μs, μk/μs is 0.30 or more and 0.58 or less.

1 is a view showing a shape of a writing pad 10 for a touch panel pen according to Embodiment C. A cross-sectional view of the state. The touch panel pen writing sheet 10 of FIG. 1 has a resin layer 2 on one side of the plastic film 1. The touch panel pen writing sheet 10 of FIG. 2 is a single layer structure of the resin layer 2.

The writing sheet for the touch panel pen of Embodiment C can satisfy the condition (C1) on one surface, or the condition (C1) can be satisfied on both surfaces.

Hereinafter, there is a case where the writing piece for a touch panel pen is referred to as a "writing sheet". In addition, hereinafter, the surface satisfying the condition (C1) is referred to as a "writing surface".

<writing surface>

In the picking method of the writing sheet for a touch panel pen according to the embodiment C, a surface having a surface satisfying the following condition (C1) is selected as a writing sheet for a touch panel pen.

When writing text or drawing graphics, most of them stop writing for a while before starting to write (for example, when switching the writing direction, usually stop writing for a moment. Also, when writing the writing position, the writing will stop writing for a moment). When writing is stopped for a while as described above, it is susceptible to the difference between the static friction coefficient and the dynamic friction coefficient.

When μk/μs is less than 0.30, or μk/μs exceeds 0.58, it is difficult to convert the writing direction to the desired direction when writing is stopped after writing is stopped, and the writing of the imagination cannot be completed. Therefore, the selection of the writing piece satisfying the condition (C1) is related to the writing piece which can be efficiently selected and can realize the writing of the imaginary writing when the writing is stopped for a while.

The condition (C1) preferably satisfies the relationship of 0.30 ≦ μk/μs ≦ 0.44.

In the embodiment C, the dynamic friction coefficient μk means the average value of the dynamic friction coefficients of all measurement times. The static friction coefficient is set to be the peak value of the initial frictional force equal to or higher than the dynamic friction coefficient as the measurement time elapses from the frictional force 0. The measurement interval of the coefficient of friction is preferably set to 0.02 seconds.

The μk and μs are average values obtained by measuring each of 20 samples. The μk/μs is a value obtained by measuring μk/μs of each sample for each of 20 samples and averaging μk/μs of 20 samples.

Μk and μs can be measured by the same method as that described in the embodiment A.

The picking method of the writing sheet of the embodiment C is preferably such that the μk of the picking surface satisfies the following condition (C2) from the viewpoint of selecting a writing sheet which is not excessively smooth and moderately resistant.

<condition (C2)>

0.06≦μk≦0.30

The condition (C2) more preferably satisfies 0.08 ≦μk ≦ 0.28, and further preferably satisfies 0.08 ≦ μk ≦ 0.20.

0.06≦μk≦0.30

From the viewpoint of selecting a writing sheet that does not have an excessively smooth and moderate resistance feeling, the sorting method of the writing sheet of the embodiment C preferably picks up the μs of the writing surface to satisfy the following condition (C2').

<condition (C2')>

0.15≦μs≦0.95

The condition (C2') more preferably satisfies 0.20 ≦μs ≦ 0.60, and further preferably satisfies 0.25 ≦ μs ≦ 0.50.

The touch panel pen used for the determination of the conditions (C1), (C2), and (C2') is not particularly limited and can be appropriately selected from commercially available touch panel pens.

Further, when the pen is too close to the writing piece and the pen is not substantially in close contact with the writing piece, it becomes difficult to design a writing piece satisfying the condition (C1) or the like. Therefore, the touch panel pen used for the determination of the condition (C1) or the like is preferably a structure that will constitute the nib and the shaft of the touch panel pen. The apparent Young's modulus is set to E, the diameter of the nib is set to D, and the arithmetic mean height of the cross-sectional curve in the unit measurement section (0.5 mm) of the nib is set to Pa, and is derived from the following formula (i) The X is from 0.1 MN/m to 100,000 MN/m, more preferably from 0.5 MN/m to 80,000 MN/m.

X(MN/m)=[E×D×D]/Pa (i)

Furthermore, the unit of Young's modulus E is "N/m ² ", the unit of the diameter D of the nib is "m", and the unit of the arithmetic mean height Pa is "m". Also, "M" means "mega (10 ^6)."

"The apparent Young's modulus E of the tip of the touch panel pen and the structure of the shaft", the diameter D of the nib, and the arithmetic mean height Pa of the section curve in the unit measurement section (0.5 mm) of the nib. The measurement was carried out in the same manner as the method described in the embodiment A.

Further, when the X derived from the above formula (i) is in the above range, the values of the Young's modulus E, the diameter D, and the arithmetic mean height Pa of the touch panel pen are preferably approximately the following ranges.

The Young's modulus is preferably 0.1 to 5.0 GPa (1.0 × 10 ⁸ to 5.0 × 10 ⁹ N/m ² ), more preferably 0.5 to 2.5 GPa (5.0 × 10 ⁸ to 2.5 × 10 ⁹ N/m ² ). The diameter D is preferably from 0.3 to 6.0 mm, more preferably from 0.4 to 2.0 mm. The arithmetic mean height Pa is preferably from 0.01 to 10 μm, more preferably from 0.05 to 1.0 μm.

Further, the radius of curvature of the tip of the touch panel pen used for the determination of the condition (C1) or the like is not particularly limited, but is preferably 0.3 to 1.5 mm, more preferably 0.5 to 0.8 mm.

Further, in the sorting method of the writing sheet of the embodiment C, it is preferable that the haze of JIS K7136:2000 of the sorting writing sheet satisfies the following condition (C3).

<condition (C3)>

Haze is 5.0% or more

Efficiently select anti-glare by picking a piece that meets the condition (C3) A writing piece with good sex and writing.

The haze is preferably 10.0% or more, more preferably 15.0% or more. Furthermore, if the haze is too high, the resolution of the display element is greatly reduced. Therefore, the haze is preferably 40.0% or less, more preferably 30.0% or less.

When measuring the haze and the transmission image clarity described below, light is incident from the surface of the writing sheet opposite to the writing surface. When the both sides of the writing sheet satisfy the above condition (C1), the light incident surface may be either surface.

The haze and the transmission clarity were set to average values obtained by measuring each of 20 samples.

Further, the picking method of the writing sheet of the embodiment C is preferably selected from the widths of the optical frequency combs of the image resolution measuring device measured according to JIS K7374:2007 to be 0.125 mm, 0.5 mm, 1.0 mm, and 2.0 mm. When the image clarity is C _0.125 , C _0.5 , C _{1.0 ,} and C _2.0 , the sum C _{s of} C _0.125 , C _0.5 , C _{1.0 ,} and C _2.0 satisfies the following condition (C4).

<condition (C4)>

C _s is 100% or more

By sorting the writing sheet satisfying the condition (C4), the resolution of the display element can be suppressed from being greatly lowered.

Further, if C _{s is} too large, it may become difficult to satisfy the condition (C1) or the condition (C3). Therefore, the condition (C4) is a C _s more preferably 100% or more and less than 250%, and further preferably 120% or more and 230% or less, and further more preferably 150% or more and 200% or less.

[Touch Panel Pen Writing Tablet]

The writing sheet for a touch panel of the embodiment C has a surface satisfying the following condition (C1).

<condition (C1)>

The touch panel pen is fixed in a state of contacting the surface of the touch panel pen with a writing angle of 60 degrees, and a vertical load of 100 gf is applied to the touch panel pen to scan a length of one step of 40 mm at a speed of 14 mm/sec. The dynamic friction coefficient acting in the scanning direction of the touch panel pen at this time is μk, and when the static friction coefficient is μs, μk/μs is 0.30 or more and 0.58 or less.

Further, even when the touch panel pen is fixed in a state in which the writing surface is touched at an angle other than 60 degrees (for example, an arbitrary angle in the range of 30 to 75 degrees), it is preferable that μk/μs is in the above range. Further, even when the scanning speed is set to a speed other than 14 mm/sec (for example, an arbitrary speed in the range of 0.1 to 100 mm/sec), it is preferable that μk/μs is in the above range.

The writing sheet of the embodiment C preferably has a writing surface μk satisfying the following condition (C2).

<condition (C2)>

0.06≦μk≦0.30

Further, in the writing sheet of the embodiment C, it is preferable that the writing surface μs satisfy the following condition (C2').

<condition (C2')>

0.15≦μs≦0.95

The preferred ranges of the conditions (C1), (C2), and (C2') of the writing sheet of the embodiment C are the conditions (C1), (C2), and (C2' of the picking method of the above-described touch panel pen writing sheet. The preferred range is the same.

Further, since the writing sheet of the embodiment C easily satisfies the conditions (C1), (C2), and (C2'), it is preferable to use X derived from the above formula (i) to be 0.1 MN/m to 100,000 MN/ m touch panel pen writing piece, more preferably used as X derived from the above formula (i) is 0.5 MN /m~80,000MN/m touch panel pen writing sheet. Further, the values of the Young's modulus E, the diameter D, the arithmetic mean height Pa, and the radius of curvature of the pen tip of the touch panel pen are preferably in the above range.

Further, in the writing sheet of the embodiment C, it is preferable that the haze of JIS K7136:2000 satisfies the following condition (C3).

<condition (C3)>

Haze is 5.0% or more

Further, the writing sheet of the embodiment C is preferably such that the width of the optical frequency comb of the image resolution measuring device measured according to JIS K7374:2007 is 0.125 mm, 0.5 mm, 1.0 mm, and 2.0 mm. When the degree is C _0.125 , C _0.5 , C _1.0 and C _2.0 , the sum C _{s of} C _0.125 , C _0.5 , C _1.0 and C _2.0 satisfies the following condition (C4).

<condition (C4)>

C _s is 100% or more

The preferred ranges of the conditions (C3) and (C4) of the writing sheet of the embodiment C are the same as the preferred ranges of the conditions (C3) and (C4) of the picking method for the touch panel pen writing sheet.

In order to produce a writing sheet satisfying the condition (C1), it is preferable that the unevenness of the high-frequency component (concavity and convexity of the minute region) and the unevenness of the low-frequency component (concavity and convexity of the large region) are appropriately mixed on the writing surface. Hereinafter, the difference between the unevenness of the high-frequency component (the unevenness of the minute region) and the unevenness of the low-frequency component (the unevenness of the large region) will be described.

i The tip of the pen is grounded to the surface of the writing blade at the stage of contacting the pen with the writing piece. Therefore, it is considered that when the pen tip passes over the convex portion of the high-frequency component (micro area), the writing start is triggered, and the influence of the unevenness of the minute area on the writing feeling at the start of writing becomes large.

Ii In the stage after the start of writing, the nib moves along the uneven surface of the larger area. Therefore, the influence of the unevenness of a large area on the writing feeling after starting writing becomes large.

As described above, the unevenness of the minute area has a large influence on the writing feeling at the time of starting writing, and the unevenness of the large area has a large influence on the writing feeling after the start of writing. Therefore, the unevenness of the high-frequency component (the unevenness of the minute region) and the unevenness of the low-frequency component (the unevenness of the large region) can be appropriately mixed on the writing surface, and the writing feeling can be improved.

Further, in the case of using the touch panel pen having a larger X derived from the above formula (i), since the nib is difficult to adhere to the surface of the writing sheet, the tendency of the above (a) and (b) becomes strong. That is, in the case of using the touch panel pen having a larger X derived from the above formula (i), it is preferable that the unevenness of the high-frequency component and the unevenness of the low-frequency component are mixed on the writing surface of the writing sheet. The term "large X" means that X exceeds 500 MN/m, preferably X is 1,000 MN/m or more, and more preferably X is 2,000 MN/m or more and 100,000 MN/m or less.

<Structure of the whole writing sheet>

In the touch panel for a touch panel pen according to the embodiment C, the configuration is not particularly limited as long as at least one surface satisfies the condition (C1).

For example, the configuration of the writing sheet 10 for a touch panel pen according to the embodiment C includes a resin layer 2 as shown in FIGS. 1 and 2, and one surface of the resin layer 2 satisfies the condition (C1).

Further, although not shown, other layers than the resin layer or the plastic film may be provided, and the surface of the other layer satisfies the condition (C1). Examples of the other layer include an antistatic layer, an antifouling layer, and the like. Further, although not shown, the resin layer may be composed of two or more layers.

The surface (writing surface) satisfying the condition (C1) can be formed by (a) physical or chemical treatment such as embossing, sand blasting, etching, (b) molding by a mold, (c) coating, or the like. Such parties In the method, from the viewpoint of the reproducibility of the surface shape, it is preferable that the molding of the mold (b) is carried out, and the coating of (c) is preferable from the viewpoint of productivity and corresponding varieties.

The resin layer forming coating liquid containing the resin component, the particles, and the solvent can be applied to the plastic film by a known coating method such as gravure coating or bar coating. It is formed by drying and hardening. In order to satisfy the condition (C1) by the resin layer formed by coating, it is preferable to use micron-sized particles and nano-sized inorganic ultrafine particles as particles, and to set the film thickness, the content of the particles, and the average particle diameter of the particles. It is the range below.

The film thickness of the resin layer is preferably from 1.5 to 10 μm, more preferably from 2 to 8 μm, still more preferably from 4 to 7 μm. The film thickness of the resin layer can be measured, for example, at a thickness of 20 points according to an image of a cross section taken using a transmission electron microscope (TEM) or a scanning transmission electron microscope (STEM), and is based on an average value of 20 points. And calculate. The acceleration voltage of the TEM or STEM is preferably set to 10 to 30 kV, and the magnification is preferably set to 50,000 to 300,000 times.

Any of the organic particles and the inorganic particles can be used as the particles (micron particles) of the resin layer. Examples of the organic particles include polymethyl methacrylate, polyacrylic acid-styrene copolymer, melamine resin, polycarbonate, polystyrene, polyvinyl chloride, benzoguanamine-melamine-formaldehyde condensate, and polyfluorene. Particles composed of oxygen, a fluorine resin, a polyester resin, or the like. Examples of the inorganic particles include particles composed of ceria, alumina, cerium, zirconia, and titania. Among these particles, organic particles are preferred from the viewpoint of easiness of dispersion control.

The content of the particles (micron-sized particles) in the resin layer is preferably from 2 to 25% by mass, more preferably from 5 to 20% by mass, even more preferably from 10 to 15% by mass, based on the total solid content of the resin layer.

The average particle diameter of the particles (micron-sized particles) in the resin layer is preferably 0.2 to 8.0. More preferably, it is 0.3 to 7.0 μm, and further preferably 0.5 to 5.0 μm. In the case where the particles are aggregated, it is preferred that the average particle diameter of the aggregated particles satisfies the above range. The average particle diameter of the particles can be calculated by the same method as in the embodiment A.

The film thickness of the resin layer is preferably larger than the average particle diameter of the particles (micron particles) from the viewpoint that the surface of the writing sheet satisfies the condition (C1). Specifically, the ratio of [average particle diameter of particles] / [film thickness of resin layer] is preferably 0.40 to 0.80, more preferably 0.45 to 0.75, still more preferably 0.50 to 0.70.

Further, the particles preferably contain not only micron-sized particles as described above but also nano-sized inorganic ultrafine particles. By containing nano-sized inorganic ultrafine particles, the surface of the resin layer can be easily satisfied (C1). The reason for this is that the irregularities of the high-frequency component (the irregularities of the minute regions) are formed by the micron-sized particles, and on the other hand, when the inorganic ultrafine particles are contained, the micron-sized particles are formed in a relatively gentle manner. When it is inclined, the unevenness of the low-frequency component (concavity and convexity in a large area) is formed, and as a result, a shape in which the unevenness of the high-frequency component and the unevenness of the low-frequency component are mixed are formed. In the case of containing inorganic ultrafine particles, the thixotropic properties of the coating liquid and the drying characteristics of the solvent are affected without causing normal leveling, and thus it is considered that the above phenomenon occurs. As described above, the combination of the unevenness of the high-frequency component and the unevenness of the low-frequency component is extremely effective for the touch panel pen having a larger X derived from the above formula (i).

Further, by containing the inorganic ultrafine particles, a gentle slope is formed in the absence of the micron-sized particles, and as a result (the result of a reduction in the approximate smoothness), the antiglare property can be improved.

Examples of the inorganic ultrafine particles include ultrafine particles composed of ceria, alumina, zirconia, and titania. Among these, from the viewpoint of transparency, cerium oxide ultrafine particles are preferred.

The inorganic ultrafine particles preferably have an average primary particle diameter of from 1 to 25 nm, more preferably from 5 to 20 nm, from the viewpoint of easily obtaining the above-mentioned uneven shape.

The inorganic ultrafine particles are preferably reactive inorganic ultrafine particles into which a reactive group is introduced by surface treatment. By introducing a reactive group, a large amount of inorganic ultrafine particles can be contained in the resin layer, and the surface shape of the writing sheet can be easily made into the above range.

As the reactive group, a polymerizable unsaturated group can be preferably used, preferably a photocurable unsaturated group, and particularly preferably an free radiation curable unsaturated group. Specific examples thereof include an ethylenically unsaturated bond such as a (meth)acrylonitrile group, a (meth)acryloxy group, a vinyl group, and an allyl group, and an epoxy group.

Examples of such reactive inorganic ultrafine particles include inorganic ultrafine particles surface-treated with a decane coupling agent. When the surface of the inorganic ultrafine particles is treated with a decane coupling agent, a dry method in which a decane coupling agent is sprayed onto the inorganic ultrafine particles is used, or the inorganic ultrafine particles are dispersed in a solvent, and then a decane coupling agent is added to cause a reaction. Wet method, etc.

The content of the inorganic ultrafine particles is preferably from 1 to 20% by mass, more preferably from 2 to 15% by mass, even more preferably from 3 to 10% by mass, based on the total solid content of the resin layer. By setting it as this range, it is easy to make the surface shape of a writing sheet into the said range by the control of a leveling property, and suppression of the polymerization shrinkage of a resin layer.

Further, the ratio of the content of the micron-sized particles and the inorganic ultrafine particles in the resin layer (the content of the micron-sized particles/the content of the inorganic ultrafine particles) is preferably from the viewpoint that the surface shape of the writing sheet is in the above range. It is 1.0~3.0, more preferably 1.5~2.5.

The resin component of the resin layer preferably contains a cured product of a thermosetting resin composition or a free radiation curable resin composition, and from the viewpoint of improving mechanical strength, It is preferable to contain a cured product of the composition of the radiation curable resin, and further preferably, it contains a cured product of the ultraviolet curable resin composition.

The thermosetting resin composition contains at least a composition of a thermosetting resin and is a resin composition which is cured by heating.

Examples of the thermosetting resin include an acrylic resin, a urethane resin, a phenol resin, a urea melamine resin, an epoxy resin, an unsaturated polyester resin, and an anthrone resin. In the thermosetting resin composition, a curing agent is added to the curable resins as needed.

The composition of the radiation curable resin is a composition of a compound having an epitaxial radiation-curable functional group (hereinafter also referred to as "free radiation curable compound"). Examples of the radical radiation-curable functional group include an ethylenically unsaturated bonding group such as a (meth)acryl fluorenyl group, a vinyl group, and an allyl group, and an epoxy group or an oxetanyl group. The free radiation curable compound is preferably a compound having an ethylenically unsaturated bond group, more preferably a compound having two or more ethylenically unsaturated bond groups, and more preferably two or more. A polyfunctional (meth) acrylate compound having an ethylenically unsaturated bonding group. As the polyfunctional (meth) acrylate type compound, both a monomer and an oligomer can be used.

In addition, the term "free radiation" means an electromagnetic wave or a charged quantum beam having an energy quantum capable of polymerizing or crosslinking a molecule, and generally, ultraviolet (UV) or electron beam (EB) may be used, and X-rays may also be used. Electromagnetic waves such as gamma rays; charged particle beams such as alpha rays and ion beams.

Among the polyfunctional (meth)acrylate compounds, examples of the difunctional (meth)acrylate monomer include ethylene glycol di(meth)acrylate and bisphenol A tetraethoxy diacrylate. , bisphenol A tetrapropoxy diacrylate, 1,6-hexanediol diacrylate, and the like.

Examples of the trifunctional or higher (meth)acrylate monomer include trimethylolpropane. Tris(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol hexa(meth)acrylate, dipentaerythritol Tetra (meth) acrylate, iso-cyanuric acid modified tri(meth) acrylate, and the like.

Further, the (meth) acrylate monomer may be one in which a part of the molecular skeleton is modified, and ethylene oxide, propylene oxide, caprolactone, iso-cyanuric acid, or an alkyl group may be used. It is a modified one of a cyclic alkyl group, an aromatic group, and a bisphenol.

Moreover, examples of the polyfunctional (meth)acrylate-based oligomer include an amine ester (meth)acrylate, an epoxy (meth)acrylate, a polyester (meth)acrylate, and a polyether ( An acrylate polymer such as a methyl acrylate.

The amine ester (meth) acrylate can be obtained, for example, by a reaction of a polyol and an organic diisocyanate with a hydroxy (meth) acrylate.

Further, a preferred epoxy (meth) acrylate is obtained by reacting a trifunctional or higher aromatic epoxy resin, an alicyclic epoxy resin, an aliphatic epoxy resin, or the like with (meth)acrylic acid. (meth) acrylate; a (meth) acrylate obtained by reacting a difunctional or higher aromatic epoxy resin, an alicyclic epoxy resin, an aliphatic epoxy resin, or the like with a polybasic acid and (meth)acrylic acid; And a (meth) acrylate obtained by reacting a bifunctional or higher aromatic epoxy resin, an alicyclic epoxy resin, or an aliphatic epoxy resin with a phenol or a (meth)acrylic acid.

The above-mentioned free radiation curable compounds may be used alone or in combination of two or more.

When the free radiation curable compound is an ultraviolet curable compound, the free radiation curable composition preferably contains an additive such as a photopolymerization initiator or a photopolymerization accelerator.

The photopolymerization initiator may be selected from the group consisting of acetophenone, benzophenone, α-hydroxyalkylphenone, mischrone, benzoin, benzoin dimethyl ketal, benzhydrazine benzene. Formate, α-mercaptodecyl ester, 9-oxosulfur One or more of the classes.

The photopolymerization initiator preferably has a melting point of 100 ° C or higher. By setting the melting point of the photopolymerization initiator to 100 ° C or higher, the photopolymerization initiator remaining in the process of producing the writing sheet or the transparent conductive film of the touch panel is sublimated, thereby preventing the manufacture. Contamination of the device or transparent conductive film.

Further, the photopolymerization accelerator can reduce the polymerization inhibition by air at the time of curing and accelerate the curing rate, and examples thereof include, for example, isoamyl p-dimethylaminophenylbenzoate and p-dimethylaminobenzene. One or more of ethyl formate and the like.

In the resin layer forming coating liquid, a solvent is usually used in order to adjust the viscosity or to dissolve or disperse each component. Depending on the type of the solvent, the surface state of the resin layer after the coating and drying process is different. Therefore, it is preferred to select a solvent in consideration of the saturated vapor pressure of the solvent, the permeability of the solvent to the transparent substrate, and the like. Specifically, examples of the solvent include ketones (acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, etc.) and ethers (two). Alkane, tetrahydrofuran, etc., aliphatic hydrocarbons (such as hexane), alicyclic hydrocarbons (such as cyclohexane), aromatic hydrocarbons (such as toluene and xylene), and halogenated carbons (dichloromethane and dichloroethylene) Ethane, etc., esters (methyl acetate, ethyl acetate, butyl acetate, etc.), alcohols (butanol, cyclohexanol, etc.), cellosolve (methyl cellosolve, ethyl cellosolve) And so on, cellulose cellosolve, sulfonium (dimethyl hydrazine, etc.), guanamine (dimethylformamide, dimethylacetamide, etc.), etc., may also be a mixture of these.

When the drying of the solvent is too slow, the leveling property of the resin layer may become excessive, and thus it becomes difficult to form the above-described surface shape. Therefore, as the solvent, it is preferred to include an evaporation rate of 50% by mass or more of all the solvents (relative evaporation rate when the evaporation rate of n-butyl acetate is set to 100) The degree of the solvent is 180 or more, more preferably 60% by mass or more. The solvent having a relative evaporation rate of 180 or more is, for example, toluene. The relative evaporation rate of toluene was 195.

Moreover, it is preferable to contain a leveling agent in the resin layer forming coating liquid from the viewpoint of making the surface shape moderately smooth and easily making the surface shape of the writing sheet into the above range. The leveling agent may, for example, be a fluorine-based leveling agent, a polyfluorene-based leveling agent, a fluoropolyoxy-oxygen copolymer-based leveling agent, or the like, and is preferably a polyfluorene-based leveling agent. The amount of the leveling agent to be added is preferably 0.01 to 0.5% by weight, and more preferably 0.01 to 0.2% by weight based on the total solid content of the coating layer of the resin layer.

The plastic film can be made of polyester, triacetyl cellulose (TAC), cellulose diacetate, cellulose acetate butyrate, polyamide, polyimine, polyether oxime, polyfluorene, polypropylene, polymethylpentene. It is formed of a resin such as polyvinyl chloride, polyvinyl acetal, polyether ketone, polymethyl methacrylate, polycarbonate, polycarbonate, and amorphous olefin (Cyclo-Olefin-Polymer: COP).

In the plastic film, from the viewpoint of mechanical strength or dimensional stability, polyester (polyethylene terephthalate or polyethylene naphthalate) which is subjected to elongation processing, especially biaxial stretching processing, is preferred. ester).

The thickness of the plastic film is preferably from 5 to 200 μm, more preferably from 10 to 150 μm.

[Touch Panel]

The surface of the touch panel of the embodiment C has a touch panel of a sheet, and the surface of the touch panel pen for the touch panel pen of the embodiment C of the sheet C faces the surface of the touch panel. The way to configure the creator.

As the touch panel, a resistive touch panel, a capacitive touch panel, an in-cell touch panel, an optical touch panel, an ultrasonic touch panel, and an electromagnetic induction touch panel are exemplified.

As shown in FIG. 3, the resistive touch panel 100 is configured such that the conductive film 30 having the pair of transparent substrates 20 on the conductive film 30 is placed opposite to each other with the spacer 40 interposed therebetween. In order to have a basic configuration, a circuit (not shown) is connected to the basic configuration.

In the case of the resistive touch panel, for example, the writing sheet 10 of the embodiment C is used as the upper transparent substrate 20, and the surface of the writing sheet 10 that satisfies the condition (C1) faces the touch. The manner of the surface of the panel 100 is used. Further, although not shown, the resistive touch panel may be configured such that the writing piece of the embodiment C is attached to the upper transparent substrate so that the surface on the side of the condition (C1) faces the surface; or The writing piece of the embodiment C is placed on the upper transparent substrate so that the surface on the side of the condition (C1) faces the surface, and is fixed by a frame or the like.

The capacitive touch panel is exemplified by a surface type and a projection type, and a projection type is often used. A projection type capacitive touch panel is obtained by connecting a circuit to a basic configuration in which an X-axis electrode and a Y-axis electrode orthogonal to the X-axis electrode are disposed via an insulator. More specifically, the basic configuration is such that an X-axis electrode and a Y-axis electrode are formed on different surfaces of one transparent substrate, and an X-axis electrode, an insulator layer, and a Y-axis are sequentially formed on the transparent substrate. As shown in FIG. 4, the X-axis electrode 50 is formed on the transparent substrate 20, the Y-axis electrode 60 is formed on the other transparent substrate 20, and the layer is laminated via the insulator layer 70 such as an adhesive layer. Moreover, the aspect in which another transparent substrate is laminated in these basic aspects is mentioned.

In the case of the capacitive touch panel, for example, the writing sheet 10 of the embodiment C is used as the transparent substrate 20 on the front side, and the condition of the writing sheet 10 is satisfied. The surface on the side of (C1) is used toward the surface of the touch panel 100. Further, although not shown, the capacitive touch panel may be configured such that the writing piece of the embodiment C is placed on the transparent substrate on the front side so that the surface on the side of the condition (C1) faces the surface. Or, the writing piece of the embodiment C is placed on the transparent substrate on the front side so that the surface on the side of the condition (C1) faces the surface, and is fixed by a frame or the like.

The electromagnetic induction type touch panel is a touch panel using a special pen that generates a magnetic field. The electromagnetic induction type touch panel has at least a sensor portion for detecting electromagnetic energy generated from a pen, and further has a transparent substrate on the sensor portion. The transparent substrate may also be composed of a plurality of layers.

In the case of the electromagnetic induction touch panel, for example, the writing sheet of the embodiment C is used as the transparent substrate on the outermost surface of the transparent substrate on the sensor portion, and the condition of the writing sheet is satisfied ( The side of the side of C1) is used toward the surface of the touch panel. Alternatively, in the case of the electromagnetic induction type touch panel, the writing piece of the embodiment C may be satisfied on the transparent substrate on the outermost surface of the transparent substrate located on the sensor portion (C1). The surface on the side of the surface is bonded to the surface, or the surface of the writing sheet of the embodiment C is placed on the transparent substrate of the embodiment C so that the surface on the side of the condition (C1) faces the surface, and the frame or the like is used. fixed.

The in-cell touch panel is in which a touch panel function such as a resistive film type, a capacitive type, or an optical type is embedded in a liquid crystal element in which a liquid crystal is sandwiched between two glass substrates.

In the case of the in-cell type touch panel, for example, the glass substrate on the surface side is bonded and used such that the surface on which the writing sheet of the embodiment C satisfies the condition (C1) faces the surface. Further, another layer such as a polarizing plate may be provided between the glass substrate on the front side and the writing sheet in the embodiment C.

[Touch Panel System]

The touch panel system of the embodiment C is a touch panel system comprising a touch panel having a touch panel pen writing sheet and a touch panel pen, and the following condition (C1) is satisfied.

<condition (C1)>

The touch panel pen is fixed in a state of contacting the surface of the touch panel pen with a writing angle of 60 degrees, and a vertical load of 100 gf is applied to the touch panel pen to scan a length of one step of 40 mm at a speed of 14 mm/sec. The dynamic friction coefficient acting in the scanning direction of the touch panel pen at this time is μk, and when the static friction coefficient is μs, μk/μs is 0.30 or more and 0.58 or less.

The embodiment of the touch panel, the touch panel pen, and the touch panel pen in the touch panel system of the embodiment C include, for example, the method of picking the touch panel pen of the embodiment C. The embodiment shown in the touch panel pen writing sheet and the touch panel is the same.

According to the touch panel system of the embodiment C, the writing feeling of the touch panel can be improved.

[display device]

The display device of the embodiment C is a display device having a touch panel, and the touch panel is the touch panel of the embodiment C.

Examples of the display element include a liquid crystal display element, an EL display element, a plasma display element, an electronic paper element, and an in-cell touch panel liquid crystal display element. In the case where the display element is a liquid crystal display element, an EL display element, a plasma display element, or an electronic paper element, the touch panel of the embodiment C is placed on the display elements.

In the display device of the embodiment C, the writing feeling is improved without excessively damaging the surface, so that the resolution of the display element can be largely impaired.

[Examples]

Next, the present invention will be described in more detail by way of examples, but the present invention is not limited by the examples.

<Embodiment of Embodiment A>

A1. Measurement and evaluation

The following measurement and evaluation were performed on the writing sheets for the touch panel pen produced in the examples and the comparative examples. The results are shown in Table 1.

A1-1. Surface shape measurement

The writing sheets for the touch panel of the examples and the comparative examples were cut into 10 cm squares. The cut portion was visually confirmed to have no abnormal points such as dust or damage, and was picked from a random portion. The cut surface member was bonded to a black plate having a length of 10 cm × a width of 10 cm by an optically transparent adhesive sheet (refractive index: 1.47, thickness: 100 μm) manufactured by Toray Industries, Inc. (manufactured by Kuraray Co., Ltd., trade name: CosmoGrass No.: DFA502K) A sample was obtained with a thickness of 2.0 mm), and 20 samples were prepared.

Using a surface roughness measuring device (model: SE-3400/manufactured by Kosei Research Co., Ltd.), the sample is set so as to be in a state of being fixed to the measuring table, and the following measurement conditions are used. The measurement items described were measured for the surface shape of the resin layer side of each sample. Then, the average value of the 20 samples was defined as Rz _0.8 , Rv _0.8 , S _2.5 , Ra _0.8 and Ptm of each of the examples and the comparative examples. The results are shown in Table 1.

<Measurement conditions>

[The stylus of the surface roughness detecting section]

The trade name SE2555N manufactured by Kosaka Research Co., Ltd. (front end radius of curvature: 2μm, top angle: 90 degrees, material: diamond)

[Measurement conditions of surface roughness measuring device]

‧ Rz _0.8 , Rv _0.8 , S _2.5 and Ra _0.8 evaluation length: 5 times the cutoff value λc

‧Rz _0.8 , Rv _0.8 , S _2.5 and Ra _0.8 preparation length: 2 times the cutoff value λc

‧Needle delivery speed: 0.5mm/s

‧ Vertical magnification: 2000 times

‧ Horizontal magnification: 10 times

‧Sliding mat: not used (not touching the measuring surface)

‧ Cutoff filter type: Gauss

‧ Dead band rating: 10%

‧tp/PC curve: ordinary

<Measurement item>

The cutoff value of 0.8mm ‧ JIS B0601: 2001 of the maximum height roughness to Rz _0.8, the cutoff value of 0.8mm JIS B0601: 2001 of the roughness curve of the maximum valley depth Rv _0.8 is set when the Rv _0.8 / Rz _0.8

‧ cutoff value of 2.5mm JIS B0601: 1994 Peak of the local average spacing S _2.5

‧The arithmetic mean roughness Ra _0.8 of JIS B0601:2001 with a cutoff value of 0.8 mm

‧ Set the unit measurement interval to 1 mm, set the maximum height of the profile in the unit measurement section to Pp, and set the maximum valley depth of the profile curve in the unit measurement section to Pv, and set the sum of Pp and Pv to The average value Ptm of Pt of the five measurement intervals at the maximum profile height Pt of the profile curve in the unit measurement section. The cutoff value is 0.

A1-2. Through image clarity

It is prepared to cut the writing sheet for the touch panel of the examples and the comparative examples into 20 samples each of which is 5 cm square. The 20 parts were visually confirmed to have no abnormal points such as dust or damage, and were picked from random parts.

Using an image resolution measuring instrument (trade name: ICM-1T) manufactured by Suga Test Instruments, four types of optical frequency combs having a width of 0.125 mm, 0.5 mm, 1 mm, and 2 mm were passed according to JIS K7374:2000. Image sharpness is measured and the sum C _{s is} calculated. Then, the average value of the 20 samples was set as the sum _C s of each of the examples and the comparative examples. The light incident surface is set to the plastic film side.

A1-3. Haze

The haze (total haze) of each sample prepared in the above "A1-2" was measured in accordance with JIS K-7136:2000 using a haze meter (HM-150, manufactured by Murakami Color Research Laboratory). Then, the average value of the 20 samples was set to the haze of each of the examples and the comparative examples. The light incident surface is set to the plastic film side.

A1-4. Coefficient of friction

Using the trade name HEIDON-14DR manufactured by Shinto Scientific Co., the static friction coefficient (μs) and the dynamic friction coefficient (μk) were measured by the following method in a single-pass friction measurement mode to calculate μk/μs. The measurement was performed once for each of 20 samples, and μk/μs of each sample was calculated, and the average value of μk/μs of 20 samples was set to μk/μs of each of the examples and the comparative examples. Regarding the environment at the time of measurement, the temperature system was set to 23 ° C ± 5 ° C, and the humidity system was set to 50% ± 10%. The measurement interval of the coefficient of friction was set to 0.02 seconds. Further, each sample was placed in an environment of 23 ° C ± 5 ° C and a humidity of 50% ± 10% for 10 minutes or more before the start of the measurement.

As shown in FIG. 7, the touch panel pen A1 or A2 described below is touched at an angle of 60 degrees. The surface of the resin layer side of the writing pad of the panel pen is fixed by a holder. A weight of 100 g was placed on the base of the upper portion of the holder, and a vertical load of 100 gf was applied to the touch panel pen. The movable table to which the writing piece is fixed is moved at a speed of 14 mm/sec toward the obtuse angle side (the left side in FIG. 7) formed by the corner of the movable table and the touch panel pen. The static friction coefficient (μs) and the dynamic friction coefficient (μk) of the moving direction of the pen when the length of one stroke of 40 mm was moved were measured. If μk/μs is 0.30≦μk/μs≦0.58, it means that the balance between the static friction coefficient and the dynamic friction coefficient is good, and the writing feeling is good when writing is stopped for a while.

<Touch Panel Pen A1>

3-color steel ball pen with touch pen (manufactured by Mitsubishi Pencil Co., Ltd., trade name: JETSTREAM nib); apparent Young's modulus of the structure of nib and shaft: 0.002 GPa (2.0 × 10 ⁶ N/m ² ); Diameter of the nib: 5 mm; arithmetic mean height Pa of the profile of the nib: 100 μm; X of the above formula (i): 0.5 MN/m

<Touch Panel Pen A2>

Manufactured by Toshiba Co., Ltd., trade name: Active electrostatic pen IPCZ131A; Apparent Young's modulus of nib and shaft structure: 1.5GPa (1.5×10 ⁹ N/m ² ); diameter of nib: 1.6mm; nib The arithmetic mean height Pa of the profile curve is 100 μm; X of the above formula (i): 38.4 MN/m

A1-5. Writing sense

The surface of the touch panel pen writing blade opposite to the resin layer side is bonded to the glass plate via an optically transparent adhesive sheet (thickness: 100 μm) manufactured by Toray Industries, and the touch panel pens A1 and A2 are used. Evaluation of writing sense. For those who have a good writing feeling at the start of writing and after starting writing, set the score to 2, and set the writing feeling at the beginning of writing and after starting writing to 1 The score was set to 0 when the writing was started and the writing was not good, and 20 people evaluated it. The average score of 20 people is 1.6 points or more, A is set, the score of 1.0 points or more and less than 1.6 points is set to B, and those who do not reach 1.0 points are set to C.

Regarding the environment at the time of evaluation, the temperature system was set to 23 ° C ± 5 ° C, and the humidity system was set to 50% ± 10%. Further, each sample was placed in an environment of 23 ° C ± 5 ° C and a humidity of 50% ± 10% for 10 minutes or more before the start of the evaluation.

A2. Making of touch panel pen writing piece

[Example A1]

The first resin layer coating liquid A1 of the following formulation was applied onto a plastic film (PET film, thickness: 80 μm) so as to have a thickness of 3 μm after drying, and dried to form a first resin layer by ultraviolet irradiation. Then, the second resin layer coating liquid A1 of the following formulation was applied onto the first resin layer so as to have a thickness of 2 μm after drying, and dried, and ultraviolet rays were irradiated to form a second resin layer, thereby obtaining a touch. Panel pen writing piece.

<First resin layer coating liquid A1>

<Second resin layer coating liquid A1>

[Example A2]

The plastic film was changed to a TAC having a thickness of 40 μm, and the first resin layer coating liquid A1 was changed to the first resin layer coating liquid A2 of the following formulation, and the film thickness of the first resin layer was changed to 6 μm, and the second resin was used. The touch panel pen was obtained in the same manner as in Example A1 except that the layer coating liquid A1 was changed to the second resin layer coating liquid A2 of the following formulation, and the thickness of the second resin layer was changed to 0.1 μm. Writing piece.

<First resin layer coating liquid A2>

<Second resin layer coating liquid A2>

[Example A3]

The plastic film was changed to a TAC having a thickness of 60 μm, and the first resin layer coating liquid A1 was changed to the first resin layer coating liquid A3 of the following formulation, and the thickness of the first resin layer was changed to 5 μm, and A touch panel pen writing piece is obtained in the same manner as in Embodiment A2.

<First resin layer coating liquid A3>

[Comparative Example A1]

The plastic film was changed to TAC having a thickness of 80 μm, and the first resin layer coating liquid A1 was changed to the first resin layer coating liquid A4 of the following formulation, and the thickness of the first resin layer was changed to 8 μm, and the second layer was not formed. A touch panel for a touch panel pen was obtained in the same manner as in Example A1 except for the resin layer.

<First resin layer coating liquid A4>

(propylene glycol monomethyl ether acetate)

[Comparative Example A2]

The first resin layer coating liquid A1 was changed to the first resin layer coating liquid A5 of the following formulation, and the thickness of the first resin layer was changed to 3 μm, and the second resin layer was not formed. In the same manner as in Example A1, a writing sheet for a touch panel pen was obtained.

<First resin layer coating liquid A5>

[Comparative Example A3]

The plastic film was changed to a TAC having a thickness of 40 μm, and the first resin layer coating liquid A1 was changed to the first resin layer coating liquid A6 of the following formulation, and the thickness of the first resin layer was changed to 5 μm. A touch panel for a touch panel pen was obtained in the same manner as in Example A1 except that the second resin layer was not formed.

<First resin layer coating liquid A6>

It can be clarified from the results of Table 1 that the touch panel pen writing sheets of the embodiments A1 to A3 are used as the touch panel pens with the X value of 500 MN/m or less of the above formula (i) as the touch panel pen. The writing is good until the end of writing. Moreover, in the touch panel pen for the embodiments A1 to A3, since the μk/μs is 0.30 ≦μk/μs ≦ 0.58, the balance between the static friction coefficient and the dynamic friction coefficient is good, and when the writing is stopped, the writing is started. A good sense of writing.

A3. Production of touch panel

An ITO conductive film having a thickness of 20 nm was formed on the surface of the substrate side of the writing sheet for touch panel pens of Examples A1 to A3 and Comparative Examples A1 to A3 by sputtering to form an upper electrode plate. Then, a conductive film of ITO having a thickness of about 20 nm was formed by sputtering on one surface of a tempered glass plate having a thickness of 1 mm to form a lower electrode plate. Then, it will be coated as a spacer by screen printing. The liquid free radiation curable resin (Dot Cure TR5903: Sun Ink Co., Ltd.) was spot-printed on the surface of the conductive film having the lower electrode plate, and then irradiated with ultraviolet rays by a high pressure mercury lamp to form a spacer having a diameter of 50 μm and a height of 8 μm. Arranged at intervals of 1 mm.

Then, the upper electrode plate and the lower electrode plate were placed so that the conductive films faced each other, and the edges were bonded by a double-sided tape having a thickness of 30 μm and a width of 3 mm, and Examples A1 to A3 and Comparative Examples A1 to A3 were produced. Resistive film type touch panel.

The touch panel pens A1 to A2 were used for writing on the resistive film type touch panels of the embodiments A1 to A3 and the comparative examples A1 to A3. As a result, the evaluation of the writing feeling of each touch panel pen was the same as that of Table 1.

Moreover, the resistive touch panels of the embodiments A1 to A3 and the comparative examples A1 to A3 are placed on a commercially available ultra high definition liquid crystal display device (a smart phone manufactured by Sharp, trade name: SH-03G, pixel density 480 ppi) In the above, the images were evaluated by visual observation. As a result, the touch panels of Examples A1 to A3 can suppress the resolution reduction of the ultra high definition display elements. On the other hand, the touch panel of Comparative Examples A1 to A3 cannot suppress the resolution reduction of the ultra high definition display element.

A4. Production of display device

The touch panel pen writing sheets of the embodiments A1 to A3 and the comparative examples A1 to A3 and the commercially available ultra high definition liquid crystal display device (smartphone manufactured by Sharp, trade name: SH-03G, pixel density 480 ppi) are transparent A display device of Examples A1 to A3 and Comparative Examples A1 to A3 was produced by laminating an adhesive (optical transparent adhesive sheet manufactured by Toray Industries, thickness: 100 μm). Further, at the time of bonding, the surface of the touch panel pen writing blade base material side faces the display element side.

The touch panel pens A1 to A2 were used for writing on the display devices of the embodiments A1 to A3 and the comparative examples A1 to A3. As a result, the evaluation of the writing feeling of each of the touch panel pens was the same as that of Table 1.

Further, the images of the display devices of Examples A1 to A3 and Comparative Examples A1 to A3 were visually evaluated. As a result, the display devices of Examples A1 to A3 were able to suppress the reduction in the resolution of the ultra high definition display element. On the other hand, in the display devices of Comparative Examples A1 to A3, it was not possible to suppress the decrease in the resolution of the ultra high definition display element.

[Reference Example A1~A6]

For the touch panel pen writing sheets produced in the embodiments A1 to A3 and the comparative examples A1 to A3, the following touch panel pen A3 was used, and the measurement of the μk/μs and the evaluation of the writing feeling were performed by the same method as described above. . The results are shown in Table 2.

<Touch Panel Pen A3>

Manufactured by Adonit, trade name: Jot Mini; Apparent Young's modulus of nib and shaft structure: 0.1GPa (1.0×10 ⁸ N/m ² ); diameter of nib: 5.0mm; arithmetic of profile curve of nib Average height Pa: 1.0 μm; X of the above formula (i): 2,500 MN/m

From the results of Table 2, it can be confirmed that the touch panel pen writing sheets of the embodiments A1 to A3 have the touch panel pen (pen A3) having the X value of the above formula (i) exceeding 500 MN/m as the touch. When the panel pen is used, the writing feeling is not good. Further, from the results of Tables 1 and 2, it can be confirmed that the touch panel pen writing sheets satisfying the conditions (A1) and (A2) are not suitable for the touch panel of the above formula (i) having an X value exceeding 500 MN/m. Pen (hard to close to the writing piece In the case of a writing sheet, a writing sheet for a touch panel pen (a pen that is easily attached to a writing sheet) having an X value of 500 MN/m or less in the above formula (i) is suitable.

<Embodiment of Embodiment B>

B1. Measurement and evaluation

The following measurement and evaluation were performed on the writing sheets for the touch panel pen produced in the examples and the comparative examples. The results are shown in Table 3.

B1-1. Surface shape measurement

The writing sheets for the touch panel of the examples and the comparative examples were cut into 10 cm squares. The cut portion was visually confirmed to have no abnormal points such as dust or damage, and was picked from a random portion. The cut surface member was bonded to a black plate having a length of 10 cm × a width of 10 cm by an optically transparent adhesive sheet (refractive index: 1.47, thickness: 100 μm) manufactured by Toray Industries, Inc. (manufactured by Kuraray Co., Ltd., trade name: CosmoGrass No.: DFA502K) A sample was obtained with a thickness of 2.0 mm), and 20 samples were prepared.

Using a surface roughness measuring device (model: SE-3400/manufactured by Kosei Research Co., Ltd.), the sample is set so as to be in a state of being fixed to the measuring table, and the following measurement conditions are used. The measurement items described were measured for the surface shape of the resin layer side of each sample. Then, the average value of the 20 samples was defined as Rz _0.8 , Rp _0.8 , Psk, Ptm, S _2.5 and Ra _{0.8 of} each of the examples and the comparative examples. The results are shown in Table 3.

<Measurement conditions>

[The stylus of the surface roughness detecting section]

The trade name SE2555N manufactured by Kosaka Research Co., Ltd. (front end radius of curvature: 2μm, apex angle: 90 degrees, material: diamond)

[Measurement conditions of surface roughness measuring device]

‧ Rz _0.8 , Rp _0.8 , S _2.5 and Ra _0.8 evaluation length: 5 times the cutoff value λc

‧Rz _0.8 , Rp _0.8 , S _2.5 and Ra _0.8 preparation length: 2 times the cutoff value λc

‧Needle delivery speed: 0.5mm/s

‧ Vertical magnification: 2000 times

‧ Horizontal magnification: 10 times

‧Sliding mat: not used (not touching the measuring surface)

‧ Cutoff filter type: Gauss

‧ Dead band rating: 10%

‧tp/PC curve: ordinary

<Measurement item>

The cutoff value of 0.8mm ‧ JIS B0601: 2001 of the maximum height roughness to Rz _0.8, the cutoff value of 0.8mm JIS B0601: 2001 of the maximum mountain roughness curve Rp _0.8 is set high when the Rp _0.8 / Rz _0.8

‧ Measure the skewness Psk of the profile curve in 1 mm. The cutoff value is 0.

‧ Set the unit measurement interval to 1 mm, set the maximum height of the profile in the unit measurement section to Pp, and set the maximum valley depth of the profile curve in the unit measurement section to Pv, and set the sum of Pp and Pv to The average value Ptm of Pt of the five measurement intervals at the maximum profile height Pt of the profile curve in the unit measurement section. The cutoff value is 0.

‧ cutoff value of 2.5mm JIS B0601: 1994 Peak of the local average spacing S _2.5

‧The arithmetic mean roughness Ra _0.8 of JIS B0601:2001 with a cutoff value of 0.8 mm

B1-2. Haze

It is prepared to cut the writing sheet for the touch panel of the examples and the comparative examples into 20 samples each of 5 cm square. The 20 parts were visually confirmed to have no abnormal points such as dust or damage, and were picked from random parts.

The haze (total haze) of each sample was measured in accordance with JIS K-7136:2000 using a haze meter (HM-150, manufactured by Murakami Color Research Institute). Then, the average value of the 20 samples was set to the haze of each of the examples and the comparative examples. The light incident surface is set to the plastic film side.

B1-3. Through image clarity

Using the image resolution measuring instrument (trade name: ICM-1T) manufactured by Suga Test Instruments, the passing width of each sample prepared in the above "B1-2" according to JIS K7374:2000 was 0.125 mm, 0.5 mm, 1 mm. And 4 kinds of 2mm optical frequency combs are measured by image sharpness, and the sum C _{s is} calculated. Then, the average value of the 20 samples was set as the sum C _{s of} each of the examples and the comparative examples. The light incident surface is set to the plastic film side.

B1-4. Coefficient of friction

Using the trade name HEIDON-14DR manufactured by Shinto Scientific Co., the static friction coefficient (μs) and the dynamic friction coefficient (μk) were measured by the following method in a single-pass friction measurement mode to calculate μk/μs. The measurement was performed once for each of 20 samples, and μk/μs of each sample was calculated, and the average value of μk/μs of 20 samples was set to μk/μs of each of the examples and the comparative examples. Regarding the environment at the time of measurement, the temperature system was set to 23 ° C ± 5 ° C, and the humidity system was set to 50% ± 10%. The measurement interval of the coefficient of friction was set to 0.02 seconds. Further, each sample was placed in an environment of 23 ° C ± 5 ° C and a humidity of 50% ± 10% for 10 minutes or more before the start of the measurement.

As shown in FIG. 7, the touch panel pen B1 or B2 described below is brought into contact with the surface of the resin layer side of the touch panel pen writing sheet at an angle of 60 degrees, and is fixed by a holder. On the upper part of the holder A weight of 100 g is placed on the base, and a vertical load of 100 gf is applied to the touch panel pen. The movable table to which the writing piece is fixed is moved at a speed of 14 mm/sec toward the obtuse angle side (the left side in FIG. 7) formed by the corner of the movable table and the touch panel pen. The static friction coefficient (μs) and the dynamic friction coefficient (μk) of the moving direction of the pen when the length of one stroke of 40 mm was moved were measured. If μk/μs is 0.30≦μk/μs≦0.58, it means that the balance between the static friction coefficient and the dynamic friction coefficient is good, and the writing feeling is good when writing is stopped for a while.

<Touch Panel Pen B1>

The brand name "S Pen SCL24KKA" manufactured by Samsung Electronics Co., Ltd.; the apparent Young's modulus of the structure of the nib and the shaft: 1.0GPa (1.0×10 ⁹ N/m ² ); the diameter of the pen: 0.5mm; the profile of the nib The arithmetic mean height Pa of the curve: 0.1 μm; X of the above formula (i): 2,500 MN/m

<Touch Panel Pen B2>

The product name "DS special touch pen NTR-004" manufactured by Nintendo Co., Ltd.; the apparent Young's modulus of the structure of the nib and the shaft: 2.0GPa (2.0×10 ⁹ N/m ² ); the diameter of the nib: 2.0 Mm; arithmetic mean height Pa of the profile curve of the nib: 0.1 μm; X of the above formula (i): 80,000 MN/m

B1-5. Writing sense

The surface of the touch panel pen writing blade opposite to the resin layer side is bonded to the glass plate via an optically transparent adhesive sheet (thickness: 100 μm) manufactured by Toray Industries, and the touch panel pens B1 and B2 are used. Evaluation of writing sense. When the writing is started and the writing is started, the writing feeling is good, and the writing feeling is set to 2 points. When the writing is started or after the writing is started, the writing feeling is not good, and the writing is started and the writing is started. Those who have a poor sense of writing are set to 0 points and evaluated by 20 people. The average score of 20 people is 1.6 or more, and the score is 1.0 or more and less than 1.6. The score is set to B, and the one that is less than 1.0 is set to C.

Regarding the environment at the time of evaluation, the temperature system was set to 23 ° C ± 5 ° C, and the humidity system was set to 50% ± 10%. Further, each sample was placed in an environment of 23 ° C ± 5 ° C and a humidity of 50% ± 10% for 10 minutes or more before the start of the evaluation.

B1-6. Anti-glare

Under the illumination of the fluorescent lamp (the brightness of the writing surface: 500 lux), when the evaluation of the writing sense of B1-5 is performed, the person who does not care about the illumination is set to 2 points, and the illumination is slightly reflected but not For those who have caused an obstacle to writing, it is set to 1 point, and the illumination is strongly reflected and the writing is disabled as 0 points, and 20 people are evaluated. The average of 20 people divided into 1.6 points or more is set to A, the number of points of 1.0 points or more and less than 1.6 points is set to B, and those who do not reach 1.0 points are set to C.

B2. Production of touch panel pen writing piece

[Example B1]

The resin layer coating liquid B1 of the following formulation was applied onto a plastic film (thickness 40 μm triethylene cellulose resin film) so as to have a thickness of 5 μm after drying, and dried to form a resin layer by ultraviolet irradiation. Get the touch pad for the touch panel.

<Resin layer coating liquid B1>

[Example B2]

A touch panel pen writing sheet was obtained in the same manner as in Example B1 except that the resin layer coating liquid B1 was changed to the resin layer coating liquid B2 of the following formulation, and the thickness of the resin layer was changed to 7 μm.

<Resin layer coating liquid B2>

[Comparative Example B1]

The resin layer coating liquid B1 was changed to the resin layer coating liquid B3 of the following formulation, and the thickness of the resin layer was changed to 6 μm, and the thickness of the second resin layer coating liquid B1 of the following formulation was 0.1 after drying. The μm was applied to the resin layer and dried, and the second resin layer was irradiated with ultraviolet rays to obtain a writing sheet for a touch panel pen.

<Resin layer coating liquid B3>

<Second resin layer coating liquid B1>

[Comparative Example B2]

A touch panel pen was obtained in the same manner as in Example B1 except that the resin layer coating liquid B1 was changed to the resin layer coating liquid B4 of the following formulation, and the thickness of the resin layer was changed to 3 μm. Use a writing tablet.

<Resin layer coating liquid B4>

It can be clarified from the results of Table 3 that the touch panel pen writing sheets of the embodiments B1 to B2 are started to be written when the touch panel pen having the X value of the above formula (i) exceeding 500 MN/m is used as the touch panel pen. The writing feeling is good until the end of writing. Moreover, in the touch panel pen for the embodiments B1 to B2, since the μk/μs is 0.30 ≦μk/μs ≦ 0.58, the balance between the static friction coefficient and the dynamic friction coefficient is good, and when the writing is stopped, the writing is started. A good sense of writing. Further, the writing sheets for touch panel pens of Examples B1 to B2 are also excellent in anti-glare property.

B3. Production of touch panel

On the substrate side of the writing sheets of the touch panel pens of Examples B1 to B2 and Comparative Examples B1 to B2, an ITO conductive film having a thickness of 20 nm was formed by sputtering to form an upper electrode plate. Then, a conductive film of ITO having a thickness of about 20 nm was formed by sputtering on one surface of a tempered glass plate having a thickness of 1 mm to form a lower electrode plate. Then, the free radiation curable resin (Dot Cure TR5903: Sun Ink Co., Ltd.) as a coating liquid for a spacer is printed in dots by a screen printing method. After the surface of the conductive film having the lower electrode plate was irradiated with ultraviolet rays by a high-pressure mercury lamp, spacer sheets having a diameter of 50 μm and a height of 8 μm were arranged at intervals of 1 mm.

Then, the upper electrode plate and the lower electrode plate were placed so that the conductive films faced each other, and the edges were bonded by a double-sided tape having a thickness of 30 μm and a width of 3 mm, and Examples B1 to B2 and Comparative Examples B1 to B2 were produced. Resistive film type touch panel.

The touch panel pens B1 to B2 were used for writing on the resistive film type touch panels of the embodiments B1 to B2 and the comparative examples B1 to B2. As a result, the evaluation of the writing feeling of each of the touch panel pens was the same as that of Table 3.

Moreover, the resistive film type touch panels of the embodiments B1 to B2 and the comparative examples B1 to B2 are placed on a commercially available ultra high definition liquid crystal display device (a smart phone manufactured by Sharp, trade name: SH-03G, pixel density 480 ppi) The image was evaluated by visual inspection under fluorescent lighting. As a result, the touch panels of Examples B1 to B2 were superior to the touch panel of Comparative Example B1, and the touch panel of Comparative Example B2. In contrast, the resolution reduction of the ultra high definition display element can be suppressed.

B4. Production of display device

The touch panel pen writing sheets of the embodiments B1 to B2 and the comparative examples B1 to B2 and the commercially available ultra high definition liquid crystal display device (smartphone manufactured by Sharp, trade name: SH-03G, pixel density 480 ppi) are transparent. The adhesives were bonded to each other to produce display devices of Examples B1 to B2 and Comparative Examples B1 to B2. Further, at the time of bonding, the surface of the touch panel pen writing blade base material side faces the display element side.

The touch panel pens B1 to B2 were used for writing on the display devices of the embodiments B1 to B2 and the comparative examples B1 to B2. As a result, the evaluation of the writing feeling of each of the touch panel pens was the same as that of Table 3.

Moreover, the visual observation of the examples B1 to B2 and the comparative examples B1 to B2 under the illumination of the fluorescent lamp The image of the display device was evaluated (brightness of the evaluation surface: 500 lux), and the display devices of Examples B1 to B2 were excellent in anti-glare property compared with the display device of Comparative Example B1, and compared with the display device of Comparative Example B2. It can suppress the resolution reduction of ultra high definition display elements.

[Reference Example B1~B4]

For the touch panel pen writing sheets produced in the embodiments B1 to B2 and the comparative examples B1 to B2, the following touch panel pen B3 was used, and the measurement of the μk/μs and the evaluation of the writing feeling were performed by the same method as described above. . The results are shown in Table 4.

<Touch Panel Pen B3>

3-color steel ball pen with touch pen (manufactured by Mitsubishi Pencil Co., Ltd., trade name: JETSTREAM nib); apparent Young's modulus of the structure of nib and shaft: 0.002 GPa (2.0 × 10 ⁶ N/m ² ); Diameter of the nib: 5.0 mm; arithmetic mean height Pa of the profile of the nib: 100 μm; X of the above formula (i): 0.5 MN/m

From the results of Table 4, it can be confirmed that the touch panel pen writing sheets of the embodiments B1 to B2 are touched by using the touch panel pen (pen B3) having the X value of the above formula (i) of 500 MN/m or less. When controlling the panel pen, the writing feeling is not good. Further, from the results of Tables 3 and 4, it can be confirmed that the touch panel pen writing sheets satisfying the conditions (B1) and (B2) are not suitable for the touch of the above formula (i) having an X value of 500 MN/m or less. Panel pen (easy to close to writing The tablet is made of a writing sheet, and on the other hand, a writing sheet for a touch panel pen (a pen that is difficult to be intimately attached to a writing sheet) having an X value of the above formula (i) exceeding 500 MN/m.

<Example of Embodiment C>

C1. Measurement and evaluation

The following measurement and evaluation were performed on the writing sheets for the touch panel pen produced in the examples and the comparative examples. The results are shown in Table 5 or Table 6.

C1-1. Coefficient of friction

Using the trade name HEIDON-14DR manufactured by Shinto Scientific Co., the static friction coefficient (μs) and the dynamic friction coefficient (μk) were measured by the following method in a single-pass friction measurement mode to calculate μk/μs. The average value when each of the 20 samples was measured once was set to μk and μs of each of the examples and the comparative examples. Further, the measurement was performed once for each of the 20 samples, and μk/μs of each sample was calculated, and the average value of μk/μs of the 20 samples was set to μk/μs of each of the examples and the comparative examples. Regarding the environment at the time of measurement, the temperature system was set to 23 ° C ± 5 ° C, and the humidity system was set to 50% ± 10%. The measurement interval of the coefficient of friction was set to 0.02 seconds. Further, each sample was placed in an environment of 23 ° C ± 5 ° C and a humidity of 50% ± 10% for 10 minutes or more before the start of the measurement.

As shown in FIG. 7, the touch panel pens C1 to C4 described below were brought into contact with the surface of the resin layer side of the touch panel pen writing sheet at an angle of 60 degrees, and fixed by a holder. A weight of 100 g was placed on the base of the upper portion of the holder, and a vertical load of 100 gf was applied to the touch panel pen. The movable table to which the writing piece is fixed is moved at a speed of 14 mm/sec toward the obtuse angle side (the left side in FIG. 7) formed by the corner of the movable table and the touch panel pen. The static friction coefficient (μs) and the dynamic friction coefficient (μk) of the scanning direction of the pen when the length of one stroke of 40 mm was scanned were measured.

<Touch Panel Pen C1>

The brand name "S Pen SCL24KKA" manufactured by Samsung Electronics Co., Ltd.; the apparent Young's modulus of the structure of the nib and the shaft: 1.0 GPa (1.0 × 10 ⁹ N/m ² ); the diameter of the nib: 0.5 mm; the profile of the nib The arithmetic mean height Pa of the curve: 0.1 μm; X of the above formula (i): 2,500 MN/m

<Touch Panel Pen C2>

The product name "DS special touch pen NTR-004" manufactured by Nintendo Co., Ltd.; the apparent Young's modulus of the structure of the nib and the shaft: 2.0GPa (2.0×10 ⁹ N/m ² ); the diameter of the nib: 2.0 Mm; arithmetic mean height Pa of the profile curve of the nib: 0.1 μm; X of the above formula (i): 80,000 MN/m

<Touch Panel Pen C3>

3-color steel ball pen with touch pen (manufactured by Mitsubishi Pencil Co., Ltd., trade name: JETSTREAM nib); apparent Young's modulus of the structure of nib and shaft: 0.002 GPa (2.0 × 10 ⁶ N/m ² ); Diameter of the nib: 5.0 mm; arithmetic mean height Pa of the profile of the nib: 100 μm; X of the above formula (i): 0.5 MN/m

<Touch Panel Pen C4>

Manufactured by Toshiba Co., Ltd., trade name: Active electrostatic pen IPCZ131A; Apparent Young's modulus of nib and shaft structure: 1.5GPa (1.5×10 ⁹ N/m ² ); diameter of nib: 1.6mm; nib The arithmetic mean height Pa of the profile curve is 100 μm; X of the above formula (i): 38.4 MN/m

C1-2. Writing sense

The surface of the touch panel pen writing blade opposite to the resin layer side is bonded to the glass plate via an optically transparent adhesive sheet (thickness: 100 μm) manufactured by Toray Industries, and the touch panel pen is used. C1~C4, and evaluate the sense of writing. The following three kinds of writing feelings, that is, the writing feeling at the start of writing, the writing feeling after starting writing, and the writing feeling when writing is stopped for a while, are set as evaluation scores, and the writing feeling as a whole is good as 2 In the case of the general writing, the overall writing feeling is set to 1 point, and the overall writing feeling as the whole is set to 0, and 20 people evaluate it. The average score of 20 people is 1.6 points or more, A is set, the score of 1.0 points or more and less than 1.6 points is set to B, and those who do not reach 1.0 points are set to C.

Regarding the environment at the time of evaluation, the temperature system was set to 23 ° C ± 5 ° C, and the humidity system was set to 50% ± 10%. Further, each sample was placed in an environment of 23 ° C ± 5 ° C and a humidity of 50% ± 10% for 10 minutes or more before the start of the evaluation.

C1-3. Haze

It is prepared to cut the writing sheet for the touch panel of the examples and the comparative examples into 20 samples each of 5 cm square. The 20 parts were visually confirmed to have no abnormal points such as dust or damage, and were picked from random parts.

The haze (total haze) of each sample was measured in accordance with JIS K-7136:2000 using a haze meter (HM-150, manufactured by Murakami Color Research Institute). Then, the average value of the 20 samples was set to the haze of each of the examples and the comparative examples. The light incident surface is set to the plastic film side.

C1-4. Through image clarity

Using the image resolution measuring instrument (trade name: ICM-1T) manufactured by Suga Test Instruments, the passing width of each sample prepared in the above "C1-3" according to JIS K7374:2000 was 0.125 mm, 0.5 mm, 1 mm. And 4 kinds of 2mm optical frequency combs are measured by image sharpness, and the sum C _{s is} calculated. Then, the average value of the 20 samples was set as the sum C _{s of} each of the examples and the comparative examples. The light incident surface is set to the plastic film side.

C1-5. Anti-glare

Under the illumination of the fluorescent lamp (the brightness of the writing surface: 500 lux), when the evaluation of the writing sense of C1-2 is performed, the person who does not care about the illumination is set to 2 points, and the illumination is slightly reflected but not For those who have caused an obstacle to writing, it is set to 1 point, and the illumination is strongly reflected and the writing is disabled as 0 points, and 20 people are evaluated. The average of 20 people divided into 1.6 points or more is set to A, the number of points of 1.0 points or more and less than 1.6 points is set to B, and those who do not reach 1.0 points are set to C.

C2. Production of touch panel pen writing sheet

[Experimental Example C1]

The resin layer coating liquid C1 of the following formulation was applied onto a plastic film (thickness 40 μm triethylene fluorene cellulose resin film) so as to have a thickness of 5 μm after drying, and dried to form a resin layer by ultraviolet irradiation. Get the touch pad for the touch panel.

<Resin layer coating liquid C1>

[Experimental Example C2]

A touch panel pen writing sheet was obtained in the same manner as in Experimental Example C1 except that the resin layer coating liquid C1 was changed to the resin layer coating liquid C2 of the following formulation, and the thickness of the resin layer was changed to 7 μm.

<Resin layer coating liquid C2>

[Experimental Example C3]

The resin layer coating liquid C1 was changed to the resin layer coating liquid C3 of the following formulation, and the thickness of the resin layer was changed to 6 μm, and the thickness of the second resin layer coating liquid C1 of the following formulation was 0.1 after drying. The πm method was applied to the resin layer, dried, and irradiated with ultraviolet rays to form a second resin layer, thereby obtaining a writing sheet for a touch panel pen.

<Resin layer coating liquid C3>

<Second resin layer coating liquid C1>

[Experimental Example C4]

A touch panel pen writing sheet was obtained in the same manner as in Experimental Example C1 except that the resin layer coating liquid C1 was changed to the resin layer coating liquid C4 of the following formulation, and the thickness of the resin layer was changed to 3 μm.

<Resin layer coating liquid C4>

As shown in Table 5, the evaluation of the writing feeling of the writing sheet showing a value of 0.30 or more and 0.58 or less in μk/μs was A or B. In this case, it is indicated that the writing of the writing sheet in which the value of 0.30 or more and 0.58 or less is displayed in the selection of μk/μs is related to the selection of the writing sheet having a good writing feeling. Further, since the pens C1 to C4 are all of different types, the results of Table 5 indicate the case where, in the case of using any touch panel pen, a writing system in which μk/μs is displayed with a value of 0.30 or more and 0.58 or less is selected. It is related to the selection of writings with good writing.

Moreover, with respect to the touch panel pen writing sheets of Experimental Examples C1 and C2, it was confirmed that the writing feeling of the touch panel pen (pen C1 and pen C2) having the X value of the above formula (i) exceeding 500 MN/m was extremely good. And the anti-glare property is good. The reason is considered to be: the test panel C1 and C2 touch panel pen writing Since the resin layer contains micron-sized particles and nano-sized inorganic ultrafine particles, it is formed by mixing irregularities on the surface of the resin layer and irregularities in a large area.

C3. Production of touch panel

On the substrate side of the writing sheet of the touch panel pen of Experimental Examples C1 to C4, a conductive film of ITO having a thickness of 20 nm was formed by sputtering to form an upper electrode plate. Then, a conductive film of ITO having a thickness of about 20 nm was formed by sputtering on one surface of a tempered glass plate having a thickness of 1 mm to form a lower electrode plate. Then, the free radiation curable resin (Dot Cure TR5903: Sun Ink Co., Ltd.), which is a coating liquid for a spacer, is dot-printed on the surface of the conductive film having the lower electrode plate by a screen printing method, and then a high voltage is used. The mercury lamp was irradiated with ultraviolet rays, and spacer sheets having a diameter of 50 μm and a height of 8 μm were arranged at intervals of 1 mm.

Then, the upper electrode plate and the lower electrode plate were placed so that the conductive films faced each other, and the edges were bonded by a double-sided tape having a thickness of 30 μm and a width of 3 mm, thereby producing resistive film touches of Experimental Examples C1 to C4. panel.

When the touch panel pens C1 to C4 were used for writing on the resistive film type touch panels of the experimental examples C1 to C4, the evaluation of the writing feeling of each touch panel pen was the same as that of Table 5. As a result, in the touch panel system including the combination of the touch panel and the touch panel pen, the touch panel system in which the value of 0.30 or more and 0.58 or less is displayed in μk/μs is good.

Moreover, the resistive film type touch panels of the experimental examples C1 to C4 are placed on a commercially available ultra high definition liquid crystal display device (a smart phone manufactured by Sharp, trade name: SH-03G, pixel density 480 ppi), and fluorescently The image was evaluated by visual observation under the illumination of the lamp. As a result, the touch panel of the experimental example C1~2 was superior to the touch panel of the experimental example C3, and the ultra-high definition display element was suppressed as compared with the touch panel of the experimental example C4. The resolution is reduced.

C4. Production of display device

The touch panel pen writing sheets of the experimental examples C1 to C4 were attached to a commercially available ultra high definition liquid crystal display device (a smart phone manufactured by Sharp, trade name: SH-03G, pixel density 480 ppi) via a transparent adhesive. The display devices of Experimental Examples C1 to C4 were produced. Further, at the time of bonding, the surface of the touch panel pen writing blade base material side faces the display element side.

The touch panel pens C1 to C4 were used for writing on the display devices of the experimental examples C1 to C4. As a result, the evaluation of the writing feeling of each touch panel pen was the same as that of Table 5.

Moreover, the images of the display devices of Experimental Examples C1 to C4 were evaluated by visual observation under fluorescent lighting, and the display devices of Experimental Examples C1 to C2 were superior to the display device of Experimental Example C3, and Experimental Example C4. Compared with the display device, the resolution reduction of the ultra high definition display element can be suppressed.

[Industrial availability]

The touch panel pen writing sheet, the touch panel, the touch panel system and the display device of the present invention are useful for improving the writing feeling of the touch panel pen. Further, the method for selecting a writing sheet for a touch panel pen according to the present invention is useful for efficiently designing a product and quality management of a writing sheet.

1‧‧‧Plastic film

2‧‧‧ resin layer

10‧‧‧Touch panel pen writing piece

Claims (17)

A touch panel pen writing piece, which is a writing piece for a touch panel pen (A) having a maximum height roughness Rz _0.8 of JIS B0601:2001 with a cutoff value of 0.8 mm and The maximum valley depth Rv _{0.8 of the} roughness curve and the partial peak interval S _2.5 of JIS B0601:1994 with a cutoff value of 2.5 mm satisfy the following conditions (A1) and (A2), 0.35 ≦ Rv _0.8 / Rz _0.8 ≦ 0.60 (A1) 0.05mm≦S _2.5 ≦0.30mmm (A2)<Touch Panel Pen(A)>The touch panel pen is designed to represent the Young's modulus of the structure of the tip and the axis of the touch panel pen. In the case of E, the diameter of the nib is set to D, and when the arithmetic mean height of the cross-sectional curve in the unit measurement section (0.5 mm) of the nib is Pa, the X derived from the following formula (i) is 500 MN/m or less. X(MN/m)=[E×D×D]/Pa (i). For example, in the touch panel pen writing sheet of claim 1, wherein the unit measurement interval is set to 1 mm, the mountain height of the profile curve in the unit measurement section is set to Pp, and the profile in the unit measurement section is used. The maximum valley depth of the curve is set to Pv, and the sum of Pp and Pv is set as the maximum profile height Pt of the profile curve in the unit measurement section. When the average value of Pt of the five measurement sections is Ptm, the Ptm of the surface is set. The following condition (A3) was satisfied, 0.01 μm ≦ Ptm ≦ 1.00 μm (A3). A touch panel having a sheet on a surface thereof, wherein the surface of the touch panel pen writing sheet of the first or second aspect of the patent application of the sheet satisfies the conditions (A1) and (A2) It is formed toward the surface of the touch panel. A display device having a touch panel, which is a touch panel of claim 3 of the patent application. A method for selecting a writing pad for a touch panel pen, which has a maximum height roughness Rz _0.8 of JIS B0601:2001 with a cutoff value of 0.8 mm and a maximum valley depth Rv _{0.8 of a} roughness curve, and JIS B0601 with a cutoff value of 2.5 mm: The partial average interval S _{2.5 of} 1994 satisfies the surface of the following conditions (A1) and (A2) as the following writing sheet for the touch panel pen (A), 0.35 ≦ Rv _0.8 / Rz _0.8 ≦ 0.60 (A1) 0.05mm≦S _2.5 ≦0.30mm (A2)<Touch Panel Pen (A)> The touch panel pen is set to E by setting the apparent Young's modulus of the structure of the pen tip and the shaft constituting the touch panel pen. When the diameter of the pen tip is D, and the arithmetic mean height of the profile curve in the unit measurement section (0.5 mm) of the pen tip is Pa, the X derived from the following formula (i) is 500 MN/m or less, X (MN) /m)=[E×D×D]/Pa (i). A touch panel pen writing piece, which is a writing piece for a touch panel pen (B) having a maximum height roughness Rz _0.8 and a roughness curve of JIS B0601:2001 with a cutoff value of 0.8 mm. The maximum mountain height Rp _0.8 and the skewness Psk of the profile curve in the measurement section of 1 mm satisfy the surfaces of the following conditions (B1) and (B2), and the haze of JIS K7136:2000 of the writing sheet satisfies the following Condition (B3), 0.50<Rp _0.8 /Rz _0.8 ≦0.75 (B1) 0.60≦Psk (B2) Haze is 5.0% or more (B3)<Touch Panel Pen(B)>The touch panel pen will constitute a touch The apparent Young's modulus of the structure of the pen tip and the axis of the control panel pen is set to E, the diameter of the pen tip is set to D, and the arithmetic mean height of the profile curve in the unit measurement section (0.5 mm) of the pen tip is set to Pa. When X derived from the following formula (i) exceeds 500 MN/m, X (MN/m) = [E × D × D] / Pa (i). For example, in the touch panel pen writing sheet of claim 6, wherein the unit measurement interval is set to 1 mm, and the maximum height of the profile in the unit measurement section is Pp, and the section in the unit measurement section is used. The maximum valley depth of the curve is set to Pv, and the sum of Pp and Pv is set as the maximum profile height Pt of the profile curve in the unit measurement section. When the average value of Pt of the five measurement sections is Ptm, the Ptm of the surface is set. The following condition (B4) was satisfied, 0.30 μm ≦ Ptm ≦ 7.00 μm (B4). For example, in the touch panel pen writing sheet of claim 6 or 7, wherein the average peak interval of JIS B0601:1994 with a cutoff value of 2.5 mm is S _2.5 , the surface S _2.5 satisfies the following Condition (B5), 0.02 mm ≦S _2.5 ≦ 0.20 mm (B5). A touch panel having a surface on the surface thereof, wherein the surface of the touch panel pen writing sheet according to any one of the sixth to eighth aspects of the invention is configured to satisfy the conditions (B1) and (B2). It is formed toward the surface of the touch panel. A display device having a touch panel, which is in the scope of claim 9 Touch panel. A method for selecting a writing pad for a touch panel pen, selecting a maximum height roughness Rz _0.8 of a JIS B0601:2001 having a cutoff value of 0.8 mm and a maximum mountain height Rp _{0.8 of a} roughness curve, and a partial curve of a section in the measurement interval of 1 mm The sheet having the slope Pks satisfying the following conditions (B1) and (B2), and the sheet having the haze of JIS K7136:2000 satisfying the following condition (B3) is used as a writing sheet for the touch panel pen (B) described below, 0.50 <Rp _0.8 /Rz _0.8 ≦0.75 (B1) 0.60≦Psk (B2) Haze is 5.0% or more (B3)<Touch Panel Pen(B)>The touch panel pen will form the nib of the touch panel pen and The apparent Young's modulus of the axis structure is set to E, the diameter of the pen tip is set to D, and the arithmetic mean height of the profile curve in the unit measurement section (0.5 mm) of the pen tip is set to Pa, from the following formula (i) The derived X exceeds 500 MN/m, and X (MN/m) = [E × D × D] / Pa (i). A method for selecting a writing piece for a touch panel pen, and selecting a person who satisfies the following condition (C1) as a writing piece for a touch panel pen, <condition (C1)> touching the touch panel pen at an angle of 60 degrees The panel pen is fixed in the state of the surface of the writing sheet, and a vertical load of 100 gf is applied to the touch panel pen to scan a length of 40 mm per one-way at a speed of 14 mm/sec, and this time acts on the scanning direction of the touch panel pen. The dynamic friction coefficient is set to μk, and when the static friction coefficient is μs, μk/μs is 0.30 or more and 0.58 or less. For example, in the method for selecting a touch panel pen for writing a touch panel of claim 12, the one that satisfies the following condition (C2) is selected as a touch panel for a touch panel pen, <condition (C2)>0.06≦μk≦ 0.30. A touch panel pen writing sheet having a surface satisfying the following condition (C1), <condition (C1)> fixing the touch panel pen in contact with the surface of the touch panel pen writing sheet at an angle of 60 degrees While applying a vertical load of 100 gf to the touch panel pen, the length of one-way 40 mm is scanned at a speed of 14 mm/sec, and the dynamic friction coefficient acting on the scanning direction of the touch panel pen is set to μk, and the static friction coefficient is set. When it is μs, μk/μs is 0.30 or more and 0.58 or less. A touch panel having a surface on the surface thereof, wherein the surface of the touch panel pen writing sheet of the 14th application of the tablet is configured to face the surface of the touch panel. A touch panel system is composed of a touch panel having a touch panel pen writing surface and a touch panel pen. The touch panel system satisfies the following condition (C1), <condition (C1)> touch panel The pen is fixed in a state of contacting the surface of the touch panel pen writing piece at an angle of 60 degrees, and a vertical load of 100 gf is applied to the touch panel pen while scanning a length of 40 mm per one-way at a speed of 14 mm/sec. Acting on the scanning side of the touch panel pen The moving friction coefficient is set to μk, and when the static friction coefficient is μs, μk/μs is 0.30 or more and 0.58 or less. A display device having a touch panel, which is a touch panel of claim 15 of the patent application.