Sheet for pen input device

Abstract

Provided is a sheet for a pen input device that, when writing input is performed by an electronic pen, makes it possible to obtain a writing feel equivalent to or similar to that when writing is performed on a writing medium such as paper by a writing tool such as a pencil. The sheet for a pen input device is disposed on a position detection region of the position detection sensor, and includes an elastic material layer having a plurality of layer portions in a thickness direction and having elasticity, and a side of the elastic material layer opposite to the position detection sensor side is used as a writing input surface side on which writing input is performed by the electronic pen. The elastic material layer includes: a first uneven pattern formed along a direction orthogonal to a thickness direction of the elastic material layer; and a second concavo-convex pattern which is formed along a direction orthogonal to the thickness direction of the elastic material layer and is a concavo-convex pattern different from the first concavo-convex pattern.

Description

Technical Field

[0001] The present invention relates to a sheet for a pen input device which is used in the pen input device and contacts the pen tip of an electronic pen. Background Art

[0002] Recently, pen input devices are used as input devices for small electronic devices such as high-function mobile phone terminals such as smartphones or tablet terminals. The pen input device is composed of an electronic pen and a position detection device that detects the indicated position indicated by the electronic pen. The electronic pens used in the pen input devices for such small electronic devices are becoming increasingly thinner, and the number of electronic pens with the same diameter as the pen tip of a commercially available ballpoint pen is increasing.

[0003] Based on this background, it is required that the electronic pen can input with the writing feeling similar to writing on paper with a pencil or a ballpoint pen, for example. However, the input surface of the input device of the above-mentioned electronic device (the surface that the tip of the electronic pen contacts and writes) is hard, and especially when the electronic device includes a display screen, the input surface is set to a hard surface such as a glass surface. Therefore, it is difficult to obtain the writing feeling brought by the electronic pen on the input surface as the writing feeling similar to writing on paper with a pencil or a ballpoint pen.

[0004] Therefore, in order to achieve the purpose of improving the writing feel of an electronic pen on the input surface, attempts have been made since the prior art to attach a specially designed sheet (pen input device sheet) to the input surface of a pen input device in a manner that can present the above-mentioned general writing feel.

[0005] For example, Patent Document 1 (Japanese Patent Publication No. 2014-137640) and Patent Document 2 (Japanese Patent Publication No. 2014-149817) propose a pen input device sheet (film) that adjusts the writing feel by controlling the concavo-convex shape of the sheet surface. In addition, Patent Document 3 (Japanese Patent Publication No. 2006-119772) proposes a pen input device sheet (film) that presents the writing feel by applying a soft resin coating to the sheet surface. [Prior art literature] [Patent Document]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2014-137640 [Patent Document 2] Japanese Patent Application Publication No. 2014-149817 [Patent Document 3] Japanese Patent Application Publication No. 2006-119772 Summary of the invention Technical problem to be solved by the invention

[0007] In addition, there is an expectation to select a combination of a writing tool and a writing medium as a target for the writing feel when performing writing input with an electronic pen and obtain a writing feel equal to or similar to the writing feel in the combination of the target writing tool and writing medium. For example, there is an expectation to obtain a writing feel equal to or similar to the writing feel when performing writing input with a pencil on paper such as copy paper when performing writing input with an electronic pen.

[0008] However, in the method of "adjusting the writing feel by controlling the uneven shape of the surface of the sheet for a pen input device" as described in Patent Document 1 and Patent Document 2 or the method of "coating a soft resin on the surface" as described in Patent Document 3, there is a problem that it is impossible to reproduce the "sensation caused by the depression of the paper when writing on the paper with a pen (writing feel or pen pressure feeling)", and in Patent Document 1 and Patent Document 2, there is no consideration of obtaining a writing feel equal to or similar to the writing feel when performing writing input with a specific writing tool on a specific writing medium, and there is a problem that the above-mentioned problems cannot be solved.

[0009] In view of the above problems, an object of the present invention is to provide a sheet for a pen input device that "when performing writing input with an electronic pen, can obtain a writing feel equal to or similar to the writing feel when writing on paper with a pencil through a relatively simple configuration". Technical solution for solving the technical problem

[0010] To solve the above problems, the present invention provides a sheet for a pen input device, which is disposed in the position detection area of a position detection sensor, and includes an elastic material layer having elasticity, and the side of the elastic material layer opposite to the side of the position detection sensor is the writing input surface side for writing input by an electronic pen. The elastic material layer includes: a first uneven pattern formed along a direction orthogonal to the thickness direction of the elastic material layer; and a second uneven pattern formed along a direction orthogonal to the thickness direction of the elastic material layer and being an uneven pattern different from the first uneven pattern.

[0011] According to the sheet for a pen input device having the above configuration, when performing writing input with an electronic pen, a writing feel equal to or similar to the writing feel in the combination of the writing tool and the writing medium desired by the user can be obtained. Description of the drawings

[0012] Figure 1A diagram for explaining an example of a pen input device using a sheet for a pen input device of the present invention. Figure 2 A diagram for explaining an example of an electronic pen for writing input on a sheet for a pen input device of the present invention. Figure 3 A diagram for explaining a circuit configuration example of a position detection device of a pen input device using a sheet for a pen input device of the present invention. Figure 4 A diagram showing an example of the vibration frequency characteristics of the dynamic friction coefficient in one example of the writing tool and the writing medium targeted in the embodiment of the sheet for a pen input device of the present invention. Figure 5 A diagram showing an example of the vibration frequency characteristics of the dynamic friction coefficient in one example of the writing tool and the writing medium targeted in the embodiment of the sheet for a pen input device of the present invention. Figure 6 A diagram showing an example of the vibration frequency characteristics of the dynamic friction coefficient in one example of the writing tool and the writing medium targeted in the embodiment of the sheet for a pen input device of the present invention. Figure 7 A diagram showing an example of the vibration frequency characteristics of the dynamic friction coefficient in one example of the writing tool and the writing medium targeted in the embodiment of the sheet for a pen input device of the present invention. Figure 8 A sectional view for explaining a configuration example of the first embodiment of the sheet for a pen input device of the present invention. Figure 9 A diagram for explaining an important part of the configuration example of the first embodiment of the sheet for a pen input device of the present invention. Figure 10 A diagram showing an example of the measurement conditions when measuring the surface roughness for the first embodiment of the sheet for a pen input device of the present invention. Figure 11 A diagram showing an example of the evaluation conditions when evaluating the measurement results of the surface roughness for the first embodiment of the sheet for a pen input device of the present invention. Figure 12 A diagram showing a table of examples of the measurement results of the surface roughness for the first embodiment of the sheet for a pen input device of the present invention. Figure 13 A diagram showing a table of examples of various values obtained based on the measurement results of the surface roughness for the first embodiment of the sheet for a pen input device of the present invention. Figure 14 A cross-sectional view for explaining a first modification of the configuration example of the first embodiment of the sheet for a pen input device of the present invention. Figure 15 A diagram for explaining a second modification of the configuration example of the first embodiment of the sheet for a pen input device of the present invention. Figure 16 A diagram for explaining a third modification of the configuration example of the first embodiment of the sheet for a pen input device of the present invention. Figure 17 A cross-sectional view for explaining the configuration example of the second embodiment of the sheet for a pen input device of the present invention. Figure 18 A diagram for explaining an important part of the configuration example of the second embodiment of the sheet for a pen input device of the present invention. Figure 19 A cross-sectional view for explaining the configuration example of the third embodiment of the sheet for a pen input device of the present invention. Figure 20 A cross-sectional view for explaining the configuration example of the fourth embodiment of the sheet for a pen input device of the present invention. Detailed Embodiment

[0013] [Configuration Example of Pen Input Device] An example of the configuration of one of the pen input devices applicable to the sheet for a pen input device of the present invention will be described.

[0014] Figure 1 A diagram showing an example of a flat panel information terminal 200 as one example of a pen input device. In this example, the flat panel information terminal 200 includes a display device 202 (in this example, an LCD (Liquid Crystal Display)) in the terminal housing, and, at the lower part (back side) of the display screen 202D of the display device 202, includes a position detection device 300 using electromagnetic induction. In addition, when the display device 202 is not provided, it becomes a tablet-type terminal, and under the top plate of the terminal housing (the upper surface plate constituting the input surface of the tablet-type terminal), includes the position detection device 300.

[0015] In Figure 1 the case of the example of Figure 1Although the illustration is omitted, an electromagnetic induction type position detection sensor including "a position detection area having a size corresponding to the display area of the display screen 202D of the display device 202" is provided, and this position detection sensor is arranged in a state where its position detection area overlaps with the display area of the display screen 202D. Therefore, the flat information terminal 200 in this example is configured such that substantially the entire area of the display area of the display screen 202D becomes the position detection area of the position detection sensor.

[0016] In addition, the position detection sensor can also be arranged in such a way that the position detection area corresponds not to substantially the entire area of the display area of the display screen 202D but to a part of the display area.

[0017] In addition, the flat information terminal 200 in this example includes an electronic pen 1 that performs position indication in an electromagnetic induction manner with respect to the position detection sensor of the position detection device 300. In addition, on the display screen 202D of the flat information terminal 200, the sheet 100 for a pen input device according to the first embodiment of the present invention is attached and provided. In this example, since substantially the entire area of the display area of the display screen 202D is set as the position detection area of the position detection sensor, the sheet 100 for a pen input device is arranged so as to cover the entire area of the display area of the display screen 202D. Moreover, the surface exposed by this sheet 100 for a pen input device becomes the input surface for position indication by the electronic pen 1, that is, the writing input surface.

[0018] In addition, of course, in the aforementioned tablet-type terminal that does not include the display device 202, the sheet 100 for a pen input device according to the embodiment of the present invention can also be used.

[0019] The user brings the tip (pen tip) of the core of the electronic pen 1 into contact with the sheet 100 for a pen input device, and performs an input operation such as drawing a line on the sheet 100 for a pen input device while applying a specific pen pressure to the pen tip. The position detection device 300 detects the drawing input on the sheet 100 for a pen input device performed by the electronic pen 1, and also detects the pen pressure of the electronic pen 1 at the time of this drawing input.

[0020] [Explanation of the structural configuration example of the electronic pen 1] Figure 2 This is a diagram showing an overview of the electronic pen 1 used in the flat information terminal 200 in this example. In the case where the electronic pen 1 in this example is an electromagnetic induction type electronic pen, inside the hollow portion of the cylindrical-shaped housing 2, a position detection coil 3, a pen pressure detection unit 4, and a printed circuit board 6 on which electronic components such as a capacitor 5 that forms a resonance circuit together with the coil 3 are mounted are sequentially arranged side by side in the axial direction.

[0021] The coil 3 is wound around a ferrite core 7, which is an example of a magnetic core and has a through-hole 7a in the axial direction, and is housed near the opening 2a on the nib side of the housing 2. The pen pressure detection unit 4 includes a fitting portion 9 that fits with the axial portion 82 of the core body 8.

[0022] In this example, the core body 8 has a configuration in which the front end portion 81 serving as the nib and the axial portion 82 are integrally joined. The core body 8 is inserted into the housing 2 through the opening 2a from the side of the axial portion 82 and passes through the through-hole 7a of the ferrite core 7. In addition, the end portion of the axial portion 82 of the core body 8 is fitted and held by the fitting portion 9 provided in the pen pressure detection unit 4. When the end portion of the axial portion 82 is fitted with the fitting portion 9, the front end portion 81 of the core body 8 is in a state of protruding from the opening 2a of the housing 2 as shown in Figure 2 .

[0023] In Figure 2 's example, the pen pressure detection unit 4 is configured as a variable capacitance capacitor that detects the pen pressure applied to the front end portion 81 of the core body 8 as a change in capacitance, and is electrically connected to the printed circuit board 6 to form a resonance circuit together with the coil 3 and the capacitor 5.

[0024] The electromagnetic induction type electronic pen 1 in this example interacts signals with the position detection sensor of the position detection device 300 through the resonance circuit. Based on this, the position detection device 300 detects the coordinates of the position indicated by the electronic pen 1.

[0025] The pen pressure detection unit 4 receives the axial pressure of the core body 8 via the fitting portion 9 and detects this axial pressure as a change in capacitance. In addition, in the electronic pen 1 of this example, due to this change in capacitance, the resonance frequency of the resonance circuit changes. The position detection device detects this change in resonance frequency and detects the pen pressure applied to the front end portion 81 of the core body 8 of the electronic pen 1 based on this.

[0026] [Circuit configuration for position detection and pen pressure detection in the position detection device used with the electronic pen 1] Next, referring to Figure 3 , a circuit configuration example of the position detection device 300 for detecting the indicated position by the above-mentioned electronic pen 1 and the pen pressure (= load) applied to the electronic pen 1 and its operation will be described.

[0027] As shown here Figure 3As shown generally in the figure, at the electronic pen 1, one end and the other end of the coil 3 are connected to the capacitor 5, and the variable capacitance capacitor 4C formed by the pen pressure detection unit 4 is connected in parallel with the coil 3 and the capacitor 5 to form a resonance circuit 1R.

[0028] The electromagnetic induction type position detection device 300 of the present embodiment transmits a signal to the electronic pen 1 by electromagnetic induction coupling, and the electronic pen 1 returns the signal received from the position detection device 300 via the resonance circuit 1R.

[0029] At the position detection device 300, it is configured to receive the return signal from the resonance circuit 1R of the electronic pen 1 by electromagnetic induction coupling, and detect the position on the sensor indicated by the electronic pen 1 based on the position on the sensor detected by the received signal. Also, by detecting the phase change of the signal received from the resonance circuit 1R of the electronic pen 1 by electromagnetic induction coupling, the change in the resonance frequency is detected, and the pen pressure applied to the front end 81 of the core 8 of the electronic pen 1 is detected.

[0030] At the position detection device 300, the X-axis direction circular coil group 311 and the Y-axis direction circular coil group 312 are laminated to form the position detection sensor 310 composed of position detection coils. Also, at the position detection device 300, a selection circuit 313 connected to the X-axis direction circular coil group 311 and the Y-axis direction circular coil group 312 is provided. This selection circuit 313 sequentially selects one circular coil from the two circular coil groups 311 and 312.

[0031] In addition, an oscillator 301, a current driver 302, a switching connection circuit 303, a receiving amplifier 304, a position detection circuit 305, a pen pressure detection circuit 306, and a processing control unit 307 are provided at the position detection device 300. The processing control unit 307 is constituted by a microcomputer. The processing control unit 307 controls the selection of the circular coil at the selection circuit 313 and the switching of the switching connection circuit 303, and controls the processing timing at the position detection circuit 305 and the pen pressure detection circuit 306.

[0032] The oscillator 301 generates an AC signal with a frequency f0. Additionally, the oscillator 301 supplies the generated AC signal to the current driver 302 and the pen pressure detection circuit 306. The current driver 302 converts the AC signal supplied from the oscillator 301 into a current and sends it to the switching connection circuit 303. The switching connection circuit 303 switches the connection target (transmission-side terminal T, reception-side terminal R) connected to the "circulation coil selected by the selection circuit 313" under the control from the processing control unit 307. Among this connection target, the current driver 302 is connected to the transmission-side terminal T, and the reception amplifier 304 is connected to the reception-side terminal R.

[0033] The induced voltage generated in the circulation coil selected by the selection circuit 313 is sent to the reception amplifier 304 via the selection circuit 313 and the switching connection circuit 303. The reception amplifier 304 amplifies the induced voltage supplied from the circulation coil and sends it to the position detection circuit 305 and the pen pressure detection circuit 306.

[0034] In each circulation coil of the X-axis direction circulation coil group 311 and the Y-axis direction circulation coil group 312, an induced voltage is generated by the radio wave transmitted from the electronic pen 1. The position detection circuit 305 demodulates the induced voltage generated in the circulation coil, that is, the reception signal, and converts the demodulated output signal into a digital signal and outputs it to the processing control unit 307. The processing control unit 307 calculates the coordinate values of the indication positions in the X-axis direction and the Y-axis direction of the electronic pen 1 based on the digital signal from the position detection circuit 305, that is, based on the level of the voltage value of the induced voltage generated in each circulation coil.

[0035] On the other hand, the pen pressure detection circuit 306 synchronously demodulates the output signal of the reception amplifier 304 with the AC signal from the oscillator 301, obtains a signal with a level corresponding to the phase difference (frequency shift) between them, and converts the signal corresponding to the phase difference (frequency shift) into a digital signal and outputs it to the processing control unit 307. The processing control unit 307 detects the pressure applied to the electronic pen 1 based on the digital signal from the pen pressure detection circuit 306, that is, based on the level of the signal corresponding to the "phase difference (frequency shift) between the transmitted radio wave and the received radio wave".

[0036] [Explanation of the outline of the production process of the sheet for the pen input device of the embodiment] Among the sheets for pen input devices of several embodiments described below, including the sheet 100 for pen input device of the first embodiment, it is not merely to improve the writing feel when writing and inputting on paper as an example of a writing medium with a writing tool such as a pencil, but rather to enable the selection of a target writing tool and writing medium for which a writing feel is desired with an electronic pen and obtain a writing feel as close as possible to "the writing feel when writing and inputting on the selected writing medium with the selected writing tool".

[0037] Before describing the configuration example of the sheet for pen input device of this embodiment, first, an overview of the manufacturing process of the sheet for pen input device of this embodiment will be described.

[0038] (1) First, the manufacturer of the sheet for pen input device of this embodiment selects a combination of a target writing tool and a writing medium for which a writing feel is desired with an electronic pen.

[0039] (2) Next, on the selected writing medium, the selected writing tool is moved in a specific direction at a specific speed, for example, in a straight line, while applying a specific pen pressure, and the dynamic friction coefficient at this time is measured. At this time, the dynamic friction coefficient is measured as a time-series change (vibration change) with the passage of time during the straight-line movement as the horizontal axis.

[0040] (3) Next, the time-series change of the dynamic friction coefficient obtained as the measurement result is subjected to Fourier transform to obtain the power spectrum of the change (vibration) of the dynamic friction coefficient with respect to the passage of time, that is, to obtain the vibration frequency characteristics of the dynamic friction coefficient. In addition, in this embodiment, it is configured to detect the frequency distribution of the magnitude of the vibration of the dynamic friction coefficient in the obtained vibration frequency characteristics of the dynamic friction coefficient and the frequencies protruding from adjacent frequency regions, and to pre-detect the frequencies presenting peaks of the magnitude of the vibration protruding from the broad waveform of the frequency distribution of the magnitude of the vibration. In addition, depending on the combination of the writing tool and the writing medium, there may be a case where no prominent frequency appears. In such a combination, the maximum value at the vertex of the peak portion constituting the frequency distribution of the magnitude of the vibration becomes the peak of the magnitude of the vibration.

[0041] (4) Next, in the case of the combination of the selected writing tool and writing medium obtained as described above, the sheet for pen input device of the embodiment of the present invention is manufactured by being configured to have a vibration frequency characteristic of the dynamic friction coefficient suitable for "the vibration frequency characteristic of the dynamic friction coefficient when the selected writing tool is moved on the selected writing medium at a specific speed".

[0042] That is, the thin sheet for a pen input device according to an embodiment of the present invention is configured such that when an electronic pen is moved on the writing input surface of the thin sheet for a pen input device of the embodiment of the present invention being manufactured at the same speed as when the dynamic friction coefficient was measured in the combination of the selected writing tool and writing medium, the vibration frequency characteristics of the dynamic friction coefficient are adapted to the vibration frequency characteristics of the dynamic friction coefficient obtained in the combination of the selected writing tool and writing medium.

[0043] In this case, as a method for adapting the vibration frequency characteristics of the two dynamic friction coefficients to each other, in the present embodiment, it is specifically configured such that "the frequency at which the peak of the magnitude of the vibration of the dynamic friction coefficient appears in the vibration frequency characteristics of the dynamic friction coefficient obtained for the thin sheet for a pen input device" falls within the range of "the frequency fp±ΔHz at which the peak of the magnitude of the vibration of the dynamic friction coefficient exists in the vibration frequency characteristics of the dynamic friction coefficient obtained in the combination of the selected writing tool and writing medium".

[0044] Here, regarding the value of Δ in the frequency fp±ΔHz, in the present embodiment, it is set according to the amplitude of the pen pressure applied to the tip of the electronic pen 1 when the user is writing. In addition, regarding the value of Δ, considering that the tip of the writing tool in contact with the writing medium has various hardnesses (that is, in the present embodiment, the pencil lead has various hardnesses), the value of Δ is determined in consideration of the difference in the frequencies at which peaks appear corresponding to these various hardness differences. In addition, it is not limited to pencils. For example, among fountain pens, there are also differences in the hardness of the nibs. In addition, in the case of ballpoint pens, there are also differences in the size of the front pen beads (the thickness of the nib), and the value of Δ is determined according to these differences.

[0045] When writing input is performed with an electronic pen on the thin sheet for a pen input device according to an embodiment of the present invention manufactured in this way, a writing feel equivalent to or similar to the writing feel in the combination of the selected writing tool and writing medium is confirmed as a sensory evaluation.

[0046] As described above, in the thin sheet for a pen input device according to an embodiment of the present invention, focusing on the vibration frequency characteristics of the dynamic friction coefficient obtained in the combination of the writing tool and the writing medium, the thin sheet for a pen input device is configured such that "the vibration frequency characteristics of the dynamic friction coefficient of the thin sheet for a pen input device of the embodiment" are adapted to "the vibration frequency characteristics of the dynamic friction coefficient obtained in the combination of the selected target writing tool and writing medium", and a writing feel equivalent to or similar to the writing feel in the combination of the selected writing tool and writing medium can be obtained.

[0047] In addition, in the sheet for a pen input device according to an embodiment of the present invention, since the frequency of "the peak of the magnitude of the vibration of the coefficient of dynamic friction in the vibration frequency characteristics of the coefficient of dynamic friction of the sheet for a pen input device" is made to fall within "the frequency range in which the peak of the magnitude of the vibration of the coefficient of dynamic friction in the vibration frequency characteristics of the coefficient of dynamic friction obtained under various pen pressures in the combination of the selected writing tool and the writing medium exists", the sheet for a pen input device is configured. Therefore, even if the pen pressure applied to the electronic pen during writing changes, a writing feel equivalent to or approximate to the writing feel in the combination of the selected writing tool and the writing medium can be obtained.

[0048] In addition, in the sheet for a pen input device according to an embodiment of the present invention, since the frequency of "the peak of the magnitude of the vibration of the coefficient of dynamic friction in the vibration frequency characteristics of the coefficient of dynamic friction of the sheet for a pen input device" is made to fall within "the frequency range in which the peak of the magnitude of the vibration of the coefficient of dynamic friction in the vibration frequency characteristics of the coefficient of dynamic friction obtained according to the difference in hardness of the tip portion, which is the contact portion between the selected writing tool and the writing medium, in the combination of the selected writing tool and the writing medium exists", the sheet for a pen input device is configured. Therefore, a writing feel equivalent to or approximate to the writing feel in the combination of the selected writing tool and the writing medium can be obtained regardless of the difference in the hardness of the core of the electronic pen.

[0049] [Description of the Sheet 100 for a Pen Input Device of the First Embodiment] The sheet 100 for a pen input device of this first embodiment is a case where the target combination of a writing tool and a writing medium for obtaining a writing feel with an electronic pen is the combination of a pencil and paper.

[0050] <Vibration Frequency Characteristics of the Coefficient of Dynamic Friction in the Target Combination of a Writing Tool and a Writing Medium> As an example of a writing tool, a pencil, in this example, is assumed to be a Hi-Uni pencil manufactured by Mitsubishi Pencil Co., Ltd., and as an example of a writing medium, copy paper is assumed.

[0051] After that, on a piece of copying paper, pencils with a core hardness of 4B, 2B, HB, and 2H were moved, and the dynamic friction coefficient at this time was measured. In this case, under the state where three types of pen pressures of 50 gf, 100 gf, and 200 gf were applied as pen pressure to the pencils, the pencils were linearly moved on the copying paper at a speed of 10 mm / second, for example, and the measurement was carried out. In addition, regarding the pencils, they were moved in a state where they were inclined at an angle of about 45 degrees to 60 degrees with respect to the paper surface of the copying paper. Then, the time-series change of the dynamic friction coefficient obtained as the measurement result was subjected to Fourier transform to obtain the power spectrum of the change (vibration) of the dynamic friction coefficient with respect to the passage of time, that is, to obtain the vibration frequency characteristics of the dynamic friction coefficient.

[0052] In Figures 4 to 7 the vibration frequency characteristics of the obtained dynamic friction coefficient are shown. Figure 4 is the case where writing was carried out with a pencil having a core hardness of 4B, Figure 5 is the case where writing was carried out with a pencil having a core hardness of 2B, Figure 6 is the case where writing was carried out with a pencil having a core hardness of HB, Figure 7 is the case where writing was carried out with a pencil having a core hardness of 2H, and the vibration frequency characteristics of the dynamic friction coefficient in these cases are shown respectively.

[0053] In addition, Figure 4 (A), Figure 5 (A), Figure 6 (A) and Figure 7 (A) is the case where 50 gf was applied to the pencil as the pen pressure, Figure 4 (B), Figure 5 (B), Figure 6 (B) and Figure 7 (B) is the case where 100 gf was applied to the pencil as the pen pressure, Figure 4 (C), Figure 5 (C), Figure 6 (C) and Figure 7 (C) is the case where 200 gf was applied to the pencil as the pen pressure, and the vibration frequency characteristics of the dynamic friction coefficient in these cases are shown respectively.

[0054] If referring to Figure 4 (A), Figure 5 (A), Figure 6 (A) and Figure 7(A) It can be confirmed that, in the case of "writing on copy paper with a pencil applying a pen pressure of 50 gf", the frequency at which the magnitude of the vibration of the dynamic friction coefficient in the vibration frequency characteristics of the dynamic friction coefficient presents a peak is 18 Hz for a pencil with a core hardness of 4B, 20 Hz for a 2B pencil, 17 Hz for an HB pencil, and 15 Hz for a 2H pencil, and it becomes a characteristic that the peak of the magnitude of the vibration of the dynamic friction coefficient appears at these frequencies. Additionally, generally, when a user holds a pencil and writes on a writing medium, the pen pressure is about 50 gf.

[0055] If referring to Figure 4 (B) and Figure 5 (B), then after 60 Hz, there are frequencies protruding from the adjacent frequency regions. However, as a broad waveform covering dozens of Hz in the frequency distribution of the magnitude of the vibration, there is a tendency to exhibit a power spectrum distribution having a maximum value at frequencies below 35 Hz. Especially in writing with a soft pencil core, during the writing process, the tip of the pencil is prone to wear. At this time, the frictional vibration during writing is affected by the vibration caused by the fragmentation of the core generated when the core wears, resulting in the dispersion of the frequency of the measured frictional vibration. Based on this, it can be confirmed that, as the peak of the magnitude of the vibration in the case of "writing on copy paper with a pencil applying a pen pressure of 100 gf", it is 22 Hz for a pencil with a core hardness of 4B and 12 Hz for a 2B pencil, and it becomes a characteristic that the peak of the magnitude of the vibration of the dynamic friction coefficient appears at these frequencies.

[0056] Additionally, if referring to Figure 4 (C) and Figure 5 (C), it can be confirmed that, in the case of "writing on copy paper with a pencil applying a pen pressure of 200 gf", the frequency at which the magnitude of the vibration of the dynamic friction coefficient in the vibration frequency characteristics of the dynamic friction coefficient presents a peak is 8 Hz for a pencil with a core hardness of 4B and 10 Hz for a 2B pencil, and it becomes a characteristic that the peak of the magnitude of the vibration of the dynamic friction coefficient appears at these frequencies.

[0057] If referring to Figure 6 (B) and Figure 7 (B), it can be confirmed that, in the case of "writing on copy paper with a pencil applying a pen pressure of 100 gf", the frequency at which the magnitude of the vibration of the dynamic friction coefficient in the vibration frequency characteristics of the dynamic friction coefficient presents a peak is 19 Hz for an HB pencil and 17 Hz for a 2H pencil, and it becomes a characteristic that the peak of the magnitude of the vibration of the dynamic friction coefficient appears at these frequencies.

[0058] In addition, if referring to Figure 6 (C) and Figure 7 (C), it can be confirmed that, in the case of "writing on copy paper with a pencil applying a pen pressure of 200 gf", the frequency at which the magnitude of the vibration of the dynamic friction coefficient peaks in the vibration frequency characteristics of the dynamic friction coefficient is 22 Hz for a pencil with a core hardness of HB and 21 Hz for a 2H pencil, and it becomes a characteristic where the peak of the magnitude of the vibration of the dynamic friction coefficient appears at these frequencies.

[0059] In addition, if referring to Figure 4 (B), (C), Figure 5 (B), (C), Figure 6 (B), (C) and Figure 7 (B), (C), it can be confirmed that as the pen pressure applied to the pencil increases, the vibration of the dynamic friction coefficient is suppressed in the vibration frequency characteristics of the dynamic friction coefficient, and if the hardness of the core of the pencil becomes harder, this tendency gradually decreases.

[0060] Based on the above facts, it can be confirmed that in the present embodiment, in a state where the pen pressure is applied in the range of 50 gf to 200 gf, except for the cases where the core hardness is 2B and 4B, when writing on copy paper with a pencil whose core is harder than these, the vibration frequency characteristics of the dynamic friction coefficient become a characteristic where the peak of the magnitude of the vibration of the dynamic friction coefficient appears in the frequency range of 17 Hz ± 5 Hz. In addition, even in the cases where the core hardness is 2B and 4B, as long as the pen pressure is in a relatively light range such as 50 gf to 100 gf, the peak of the magnitude of the vibration of the dynamic friction coefficient appears in the frequency range of 17 Hz ± 5 Hz. That is, in the present embodiment, the aforementioned ±Δ is set to ±Δ = ±5 Hz.

[0061] In addition, in this frequency range, when the pen pressure exceeds 100 gf, although it becomes a characteristic that cannot cover the cases where the core hardness is 2B and 4B, considering the hardness of the core of the electronic pen 1, even if this frequency range is set, in the sheet for pen input device of the present embodiment, a writing feel same as that in the case of the combination of a pencil and copy paper can be obtained. In addition, even if the hardness of the core of the electronic pen 1 is not considered, if considering that the pen pressure when writing on the sheet 100 for pen input device with the electronic pen 1 is usually about 50 gf, similarly, even if this frequency range is set, in the sheet for pen input device of the present embodiment, a writing feel same as that in the case of the combination of a pencil and copy paper can be obtained.

[0062] In view of the above measurement results, in this first embodiment, the pen input device sheet 100 is configured such that the "vibration frequency characteristics of the dynamic friction coefficient when writing is performed with the electronic pen 1 on the pen input device sheet 100" are made to match the "vibration frequency characteristics of the dynamic friction coefficient when writing is performed with the above pencil on the copy paper".

[0063] In this first embodiment, the vibration frequency characteristics of the dynamic friction coefficient of the pen input device sheet 100 when the electronic pen 1 is moved at a specific speed of 10 mm / second while being applied with a specific pen pressure, for example, a pen pressure of 50 gf, on the writing input surface of the pen input device sheet 100 are made to match the vibration frequency characteristics of the dynamic friction coefficient when moving under the same conditions with a pencil on the copy paper (refer to Figure 4 (A), Figure 5 (A), Figure 6 (A) and Figure 7 (A)). In this way, it is configured to have a peak in the magnitude of the vibration of the dynamic friction coefficient in a specific frequency range (in this example, a frequency range of 17 Hz ± 5 Hz). In addition, the pen pressure applied to the electronic pen 1 when obtaining the vibration frequency characteristics of the dynamic friction coefficient of the pen input device sheet 100 is not limited to 50 gf, and can be smaller than 50 gf or larger than 50 gf.

[0064] Hereinafter, a specific configuration example of the pen input device sheet 100 for the first embodiment configured in this way will be described.

[0065] [Configuration Example of the Pen Input Device Sheet 100 of the First Embodiment] Figure 8 And Figure 9 are conceptual diagrams for explaining the configuration example of the pen input device sheet 100 of the first embodiment. Figure 9 is a view of the pen input device sheet 100 of this first embodiment observed from the side of the writing input surface performed by the electronic pen 1 in the thickness direction thereof. Figure 8 is Figure 9 a sectional view taken along line A - A in

[0066] The pen input device sheet 100 of this first embodiment is composed of a base material 101 and an elastic material layer 102 disposed on this base material 101 as shown in Figure 8 . When it is a terminal having a display device 202, a transparent optical material is used as the elastic material used for this elastic material layer.

[0067] The base material 101 is made of a material harder than the elastic material of the elastic material layer 102. In this example, it is made of PET (Polyethylene terephthalate) resin. In addition, in this example, when the sheet 100 for the pen input device is disposed above the position detection device 300, the base material 101 is provided as a thin sheet member that covers the entire position detection area of the position detection sensor 310 of the position detection device 300.

[0068] In this embodiment, the elastic material layer 102 is made of an elastic material with a thickness of, for example, 0.15 mm. In this example, it is made of polyurethane resin and has a multi-layered portion with different structures in its thickness direction. In this example, the multi-layered portion of the elastic material layer 102 is composed of a first layer portion 1021 and a second layer portion 1022. In this example, the first layer portion 1021 is on the side of the base material 101 (the side of the position detection sensor 310), and the second layer portion 1022 is on the side opposite to the side of the base material 101, which is the writing input surface by the electronic pen 1.

[0069] The first layer portion 1021 of the elastic material layer 102 is set as a layer of uniform polyurethane resin as shown in Figure 8 . In addition, the second layer portion 1022 of the elastic material layer 102 is set as a layer having a first concavo-convex pattern PT1 and a second concavo-convex pattern PT2 as shown in Figure 8 and Figure 9 .

[0070] In this case, the first concavo-convex pattern PT1 is formed such that the convex portions P1 and the concave portions C1 alternately repeat in the horizontal and vertical directions of the surface of the sheet 100 for the pen input device along a direction orthogonal to the thickness direction of the layer (the direction of the plane parallel to the sheet surface) as shown in Figure 8 and Figure 9 . In addition, in Figure 9 , in order to distinguish the convex portions P1 and the concave portions C1 of the first concavo-convex pattern PT1, hatching is applied to the bottom surface of the concave portion C1 for display.

[0071] This first uneven pattern PT1 constitutes the main factor determining the writing feel of the sheet 100 for the pen input device of this embodiment. In this embodiment, particularly in such a way that it presents "the writing feel when moving on a writing medium (in this embodiment, copy paper) with a target writing tool (in this embodiment, a pencil)", for the lengths of the convex portion P1 and the concave portion C1, the average length d1 of the contour curve elements (average uneven interval) under the reference length of the parameter RSm (average length of the roughness curve elements) equivalent to surface roughness is selected, and for the height obtained by summing the convex portion P1 and the convex portion P2b, the maximum height (maximum uneven height) HT of the contour curve under the reference length of the parameter Rz (maximum height; height from the lowest valley to the highest peak in each reference length) equivalent to surface roughness is selected.

[0072] In the sheet 100 for the pen input device of this first embodiment, the vibration frequency characteristic of its dynamic friction coefficient is made to match the vibration frequency characteristic of the dynamic friction coefficient when moving on copy paper with a pencil (refer to Figure 4 (A), Figure 5 (A), Figure 6 (A) and Figure 7 (A)). In such a way that the maximum value of the peak waveform of the vibration of the dynamic friction coefficient is presented in the frequency range of 17 Hz ± 5 Hz, the average uneven interval d1 of the unevenness of the convex portion P1 and the concave portion C1 of the first uneven pattern PT1 is selected, and in such a way that the surface roughness that can obtain "the roughness when moving a pencil, which is an example of a writing tool, on paper" is presented, the maximum uneven height HT is selected.

[0073] In addition, as described above, the so-called "matching the frequency at which the peak appears" can be set such that the frequency at which the peak appears exists within a specific frequency range, or can be set such that the frequency at which the peak appears becomes a frequency that is the same as or approximately the same as a specific frequency.

[0074] In this embodiment, the average uneven interval d1 of the unevenness of the first uneven pattern PT1 is set as the average length of the contour curve elements at the reference length of the sheet 100 for the pen input device, for example, d1 = 0.5 mm to 0.6 mm. In addition, the height HT obtained by summing the convex portion P1 of the first uneven pattern PT1 and the convex portion P2a of the second uneven pattern PT2 is selected as the maximum height of the contour curve at the reference length of the sheet 100 for the pen input device and is set in the range of HT = 9 μm to 20 μm, and preferably is set to about H1 = 12.4 μm.

[0075] In addition, the second concavo-convex pattern PT2, as shown in Figure 8 and Figure 9 , is formed in the same manner as the first concavo-convex pattern PT1, with convex and concave portions recurring in the horizontal and vertical directions of the surface of the pen input device sheet 100 along a direction orthogonal to the thickness direction of the layer (the direction of the plane parallel to the sheet surface). In this embodiment, the second concavo-convex pattern PT2 is formed so as to overlap with the first concavo-convex pattern PT1. The second concavo-convex pattern PT2 is formed to have convex and concave portions recurring at specific regular intervals or to form an irregularly arranged concavo-convex shape pattern. In this example, the second concavo-convex pattern PT2 is configured to have convex and concave portions recurring at specific regular intervals.

[0076] That is, in this embodiment, as shown in Figure 8 and Figure 9 , the second concavo-convex pattern PT2 is configured to have concavo-convex portions formed on both the upper surface of the convex portion P1 and the bottom surface of the concave portion C1 of the first concavo-convex pattern PT1. In the examples shown in Figure 8 and Figure 9 , at the center of the upper surface of the convex portion P1 of the first concavo-convex pattern PT1, a convex portion P2a smaller in size (height H2 satisfies H2 < H1) than the convex portion P1 is formed. Additionally, at the center of the bottom surface of the concave portion C1 of the first concavo-convex pattern PT1, a convex portion P2b of the same size as the convex portion P2a is formed. Moreover, on the upper surface of the convex portion P1 of the first concavo-convex pattern PT1, concavo-convex portions are formed by the convex portion P2a and its peripheral portion. Also, on the bottom surface of the concave portion C1 of the first concavo-convex pattern PT1, concavo-convex portions are formed by the convex portion P2a and its peripheral portion.

[0077] Therefore, in this embodiment, when assuming the case where the plane of the first concavo-convex pattern PT1 does not exist, the second concavo-convex pattern PT2 forms convex portions P2a and P2b that are smaller (including height) than the convex portion P1 of the first concavo-convex pattern PT1 with a repetition pitch of "1 / 2 of the average interval d1 of the concavo-convex portions of the first concavo-convex pattern PT1".

[0078] That is, the second concavo-convex pattern PT2 is formed with an average interval of concavo-convex portions smaller than the average interval d1 of the concavo-convex portions of the first concavo-convex pattern PT1, and is formed as concavo-convex portions smaller in size than the concavo-convex portions of the first concavo-convex pattern PT1.

[0079] This second concavo-convex pattern PT2 functions to "disperse the sharp peak waveform of the vibration frequency characteristics of the dynamic friction coefficient of the pen input device sheet 100 generated by the concavo-convex portions of the above-mentioned first concavo-convex pattern PT1, and form a peak waveform with a broadened vibration frequency distribution".

[0080] In addition, when the sheet 100 for a pen input device is disposed on the display screen 202D, this second concavo-convex pattern PT2 has an antiglare property that reflects external light at the surface of the sheet 100 for a pen input device and suppresses a reduction in the visibility of the displayed image caused by the image being projected, and also functions to improve the visibility of the displayed image.

[0081] The method of forming the first concavo-convex pattern PT1 and the second concavo-convex pattern PT2 of the second layer portion 1022 configured as described above is as follows.

[0082] In this example, as shown in Figure 8 a transfer film member 400 is used. In this example, on the sheet-like base film 401 of this transfer film member 400, concavo-convex patterns corresponding to the first concavo-convex pattern PT1 and the second concavo-convex pattern PT2 of the second layer portion 1022 are formed by UV (ultraviolet) curable ink in this example, and the transfer concavo-convex portions 402 (hard members) are formed by UV printing through UV curing. The transfer concavo-convex portions 402 have a concavo-convex relationship opposite to that of the first concavo-convex pattern PT1 and the second concavo-convex pattern PT2 of the second layer portion 1022. In addition, furthermore, at this transfer film member 400, a release agent is applied to the surface of the concavo-convex pattern of the transfer concavo-convex portions 402. In addition, the method of forming the transfer concavo-convex portions 402 is not limited to layer lamination such as UV printing, and the target concavo-convex shape can also be formed by applying concavo-convex to the surface of the base film, or kneading a concavo-convex forming material into the base film, or pressing the base film with a mold to form concavo-convex, or by using a combination of these methods.

[0083] After that, the transfer film member 400 is set to press and attach the side of the base film 401 on which the transfer concavo-convex portions 402 are formed to the side of the elastic material layer 102 opposite to the base 101 side, and after curing the elastic material, it is peeled off. Thus, on the side of the elastic material layer 102 opposite to the base 101 side, a second layer portion 1022 having the first concavo-convex pattern PT1 and the second concavo-convex pattern PT2 as described above is formed.

[0084] The sheet 100 for a pen input device of the first embodiment manufactured as described above is disposed and used on the display screen 202D with the base 101 side facing the display screen 202D side. Therefore, the second layer portion 1022 side of the elastic material layer 102 on which the first concavo-convex pattern PT1 and the second concavo-convex pattern PT2 are formed is exposed and becomes the writing input surface for the electronic pen 1.

[0085] In the case of the sheet 100 for a pen input device according to this first embodiment, a sheet for a pen input device having a vibration frequency characteristic of the dynamic friction coefficient similar to that of the vibration frequency characteristic of the dynamic friction coefficient in the combination of the target writing tool and the writing medium can be obtained.

[0086] For example, when the writing tool is a pen with a core hardness of 4B, 2B, and HB and the writing medium is copy paper, as shown in Figure 4 (A) to (C), Figure 5 (A) to (C), and Figure 6 (A) to (C), generally, in the vibration frequency characteristic of the dynamic friction coefficient, the maximum value of the peak waveform does not protrude sharply from the front and rear frequency regions, but rather has the following tendency: it becomes the vertex part of a broad waveform of several tens of Hz covering the magnitude of the vibration in the vibration frequency region with an amplitude of about 20 Hz including the maximum value of the peak waveform.

[0087] Therefore, in this first embodiment, when it is desired to obtain the writing feel when writing on copy paper with pencils having a core hardness of 4B, 2B, and HB, the frequency of the maximum value of the peak waveform of the vibration of the dynamic friction coefficient in "the case of writing on the sheet 100 for a pen input device in the first embodiment with the electronic pen 1" is made to exist in the frequency range of 17 Hz ± 5 Hz as described above, and the first concavo-convex pattern PT1 of the second layer portion 1022 of the elastic material layer 102 is configured. In addition, the second concavo-convex pattern PT2 of the second layer portion 1022 of the elastic material layer 102 is configured to have a smaller average interval of concavo-convexities than the average interval of the concavo-convexities of the first concavo-convex pattern PT1 and have smaller concavo-convexities than the concavo-convexities of the first concavo-convex pattern PT1.

[0088] That is, the concavo-convex pattern of the UV-curable ink when forming "the transfer concavo-convex portion 402 formed on the base film 401 of the transfer film member 400" is made to correspond to the first concavo-convex pattern PT1 and the second concavo-convex pattern PT2 of the elastic material layer 102 described above. In this case, due to the presence of the second concavo-convex pattern PT2, the specific vibration frequency performed by the first concavo-convex pattern PT1 is dispersed forward and backward.

[0089] In addition, by selecting the line width of the UV-curable ink and the formation pitch of the concavo-convex pattern, etc. for the example of the concavo-convex transfer portion 402 formed on the base film 401 of the transfer film member 400 in such a manner that "the frequency at which the second peak of the vibration of the dynamic friction coefficient appears in the vibration frequency characteristics of the dynamic friction coefficient is within the frequency range of 80 Hz ± 5 Hz", it is possible to reproduce the vibration frequency characteristics of the dynamic friction coefficient with the core hardnesses of 4B, 2B, and HB.

[0090] In addition, in the case of a pencil with a core hardness of 2H, as generally shown in Figure 7 (A) to (C), the frequency at which the second largest peak of the vibration of the dynamic friction coefficient appears is within the frequency range of 100 ± ΔHz (Δ is, for example, 10).

[0091] Therefore, in the case of wanting to obtain the writing feel when writing on paper with a pencil having a core hardness of 2H, for the first concavo-convex pattern PT1, it is configured in the same manner as above. However, the formation pitch, etc. of the second concavo-convex pattern PT2 is selected in such a manner that the frequency at which "the second peak of the vibration of the dynamic friction coefficient in the vibration frequency characteristics of the dynamic friction coefficient" appears is within the frequency range of 100 Hz ± 10 Hz, and the sheet 100 for a pen input device of this first embodiment is configured.

[0092] As described above, according to the sheet 100 for a pen input device of the above-described first embodiment, when a writing input is performed on the sheet 100 for a pen input device with an electronic pen, it is possible to obtain the same feeling (writing feel or writing sensation) as when a writing input is performed on copy paper with a pencil. In addition, it is also possible to obtain the roughness during writing in the relationship between the pencil and the paper.

[0093] In addition, according to the sheet 100 for a pen input device of the first embodiment, the elastic material layer 102 is configured to have the first concavo-convex pattern PT1 and the second concavo-convex pattern PT2, and is configured to be suitable not only for the maximum value of the peak waveform of the vibration of the dynamic friction coefficient in the vibration frequency characteristics of the dynamic friction coefficient in the case of the target writing tool and writing medium, but also for the broad waveform of the frequency distribution of the magnitudes of the vibrations of the vibration frequencies before and after including the maximum value of the peak waveform. Thus, according to the sheet 100 for a pen input device of the first embodiment, it is possible to relatively easily approximate the writing feel to the writing feel of the combination of the target writing tool and writing medium.

[0094] Moreover, in the case of the sheet 100 for a pen input device according to the first embodiment, due to the presence of the second concavo-convex pattern PT2, an antiglare effect of "suppressing the reflection of external light that is generally like a mirror surface on the sheet 100 for a pen input device or the occurrence of an image being projected" can be exerted, and the visual recognition of the displayed image can be improved.

[0095] In addition, in the sheet 100 for a pen input device of the above-described first embodiment, although the first concavo-convex pattern PT1 and the second concavo-convex pattern PT2 are configured to repeatedly appear along directions parallel to the horizontal and vertical directions of the surface of the sheet 100 for a pen input device, the first concavo-convex pattern PT1 and the second concavo-convex pattern PT2 may also be formed in a direction that intersects the horizontal and vertical directions rather than being parallel to the horizontal and vertical directions of the surface of the sheet 100 for a pen input device. As long as the average interval of specific concavities and convexities is satisfied, it may not be a pattern regularly arranged in a certain direction.

[0096] In addition, in the sheet 100 for a pen input device of the above-described first embodiment, although the elastic material layer 102 is made of a urethane resin, of course, it is not limited to a urethane resin. In addition, the material of the transfer concavo-convex portion 402 of the transfer film member 400 is, of course, not limited to UV curable ink.

[0097] [Regarding the surface roughness of the sheet 100 for a pen input device according to the first embodiment] In the sheet 100 for a pen input device of the first embodiment, as described above, in the first concavo-convex pattern PT1 of large concavities and convexities, there is a second concavo-convex pattern PT2 of small concavities and convexities. By making these concavities and convexities have a specific relationship, a desired writing feel (writing sensation) can be obtained, and antiglare properties can be achieved.

[0098] In order to define the relationship between the concavities and convexities of the first concavo-convex pattern PT1 and the second concavo-convex pattern PT2, in this example, the surface roughness caused by each concavity and convexity is measured, and it is configured to be defined by using the measurement results of both.

[0099] Here, by changing the measurement conditions, the surface roughness caused by the concavities and convexities of the first concavo-convex pattern PT1 and the surface roughness caused by the concavities and convexities of the second concavo-convex pattern PT2 are respectively measured. In this case, as "the sheet 100 for a pen input device to be measured", several samples with confirmed good writing feel and antiglare properties are prepared, and the surface roughness is measured for these.

[0100] In this case, in this example, the transfer film member 400 is formed by sandwiching with two rotating rollers and processing additional irregularities. However, as the pattern for the final finish of the irregularities, a matte finish pattern is adopted. Therefore, as the transfer film member 400, two types with different manufacturing methods of matte treatment are used, and samples MP1 and MP2 of a matte finish thin sheet for a pen input device are prepared.

[0101] Furthermore, in this example, for the sample MP2, three types are prepared: a sample MP2 (standard) "using the transfer film member 400 manufactured with the standard first irregularity pattern PT1", a sample MP2 (shallower) "intentionally making the depth of the irregularities of the first irregularity pattern PT1 shallower", and a sample MP2 (deeper) "intentionally making the depth of the irregularities of the first irregularity pattern PT1 deeper". That is, the measurement of the surface roughness of the thin sheet 100 for a pen input device described below is performed for the above four types of samples MP1, MP2 (standard), MP2 (shallower), and MP2 (deeper).

[0102] In Figure 10 and Figure 11 the measurement conditions and evaluation conditions of the surface roughness in this case are presented. In Figure 11 "λc" and "λs" are the cut-off values respectively. That is, if the surface is measured by a measuring machine, a measurement profile curve with a surface shape mixed with various wavelengths is obtained. The curve obtained by removing unnecessary short-wavelength components such as noise from this measurement profile curve is called a profile curve, and the cut-off value λs determines how much short wavelength is to be removed. In addition, the curve obtained by removing the short-wavelength shape from the measurement profile curve is called a waviness curve, and the cut-off value λc determines how much short-wavelength shape is to be removed. At this time, the relationship of the length of the wavelength for truncation is λc > λs. In addition, the curve obtained by removing the long-wavelength shape (waviness curve) from the profile curve is called a roughness curve. The waviness ignores wavelengths shorter than the cut-off value λc, while the roughness ignores wavelengths longer than the cut-off value λc. These cut-off values λc and cut-off value λs are well-known knowledge (for example, refer to URL (https: / / d-monoweb.com / expert#column / surface-roughness-parameter / )).

[0103] In Figure 12 it is described for Figure 10 and Figure 11The measurement results obtained by measuring four samples, MP1, MP2 (standard), MP2 (lighter), and MP2 (darker), under the measurement conditions and evaluation conditions shown are presented. Herein, Figure 12 (A) is a table showing the measurement results for the first uneven pattern PT1 of the sheet 100 for a pen input device. Additionally, Figure 12 (B) is a table showing the measurement results for the second uneven pattern PT2 of the sheet 100 for a pen input device.

[0104] In Figure 12 the table, the parameter Ra is the arithmetic mean roughness and is the average of the absolute value deviations from the average line, calculated from the roughness curve. The parameter Rp is the highest part when a part of the roughness curve is extracted with the reference length, i.e., the maximum peak height, and the parameter Rv is the deepest part when a part of the roughness curve is extracted with the reference length, i.e., the maximum valley depth. The parameter Rz is the maximum height, obtained as the sum of the maximum peak height Rp and the maximum valley depth Rv. Further, the parameter RSm is the average length of the roughness curve elements and is the average of the peak-valley - period intervals obtained from the intersections of the roughness curve and the average points.

[0105] Additionally, the values to the right horizontally of each parameter Ra, Rp, Rv, Rz, RSm represent the cut-off value λc in the evaluation conditions. That is, in Figure 12 (A) and (B), the parameters Ra8.0, Rp8.0, Rv8.0, Rz8.0, RSm8.0 are the values of the parameters Ra, Rp, Rv, Rz, Rsm when the cut-off value λc = 8.0 mm, and the parameters Ra0.25, Rp0.25, Rv0.25, Rz0.25, RSm0.25 are the values of the parameters Ra, Rp, Rv, Rz, Rsm when the cut-off value λc = 0.25 mm.

[0106] Based on the measurement results shown in Figure 12 (A) and (B), it is possible to stipulate, as follows, that "the first uneven pattern PT1 and the second uneven pattern PT2 in the sheet 100 for a pen input device in the embodiment are in an appropriate relationship".

[0107] In addition, in this example, regarding the relationship between the first concavo-convex pattern PT1 and the second concavo-convex pattern PT2 in the sheet 100 for a pen input device of the embodiment, the ratios of the parameters Ra8.0, Rp8.0, Rv8.0, Rz8.0, and RSm8.0 measured at the cut-off value λc = 8.0 mm to the parameters Ra0.25, Rp0.25, Rv0.25, Rz0.25, and RSm0.25 measured at the cut-off value λc = 0.25 mm are obtained.

[0108] In Figure 13 , for four types of samples MP1, MP2 (standard), MP2 (lightened), and MP2 (darkened), the ratios of the respective parameters, that is, the values obtained for Ra8.0 / Ra0.25, Rp8.0 / Rp0.25, Rv8.0 / Rv0.25, Rz8.0 / Rz0.25, and RSm8.0 / RSm0.25 according to Figure 12 (A) and (B) are shown in a table. In addition, in Figure 13 , the values (average values) of the parameter RSm8.0 measured for each of the four types of samples MP1, MP2 (standard), MP2 (lightened), and MP2 (darkened) are shown.

[0109] Based on this Figure 13 , it is possible to define the matter of "the first concavo-convex pattern PT1 and the second concavo-convex pattern PT2 in the sheet 100 for a pen input device of the embodiment being in an appropriate relationship" as follows.

[0110] That is, it can be set that "the parameter RSm8.0 measured at the cut-off value λc = 8.0 mm falls within the range of 0.513 to 0.816, and the ratio of the parameter Ra8.0 measured at the cut-off value λc = 8.0 mm to the parameter Ra0.25 measured at the cut-off value λc = 0.25 mm, that is, Ra8.0 / Ra0.25, falls within the range of 1.908 to 3.349" as one of the conditions representing an appropriate relationship.

[0111] In addition, it can also be set that "the parameter RSm8.0 measured at the cut-off value λc = 8.0 mm falls within the range of 0.513 to 0.816, and the ratio of the parameter Rv8.0 measured at the cut-off value λc = 8.0 mm to the parameter Rv0.25 measured at the cut-off value λc = 0.25 mm, that is, Rv8.0 / Rv0.25, falls within the range of 1.769 to 3.997" as one of the conditions representing an appropriate relationship.

[0112] [Modification Example of the Sheet 100 for a Pen Input Device of the First Embodiment] In the sheet 100 for a pen input device of the first embodiment described above, in order to be removable from the display screen 202D, it is configured such that an elastic material layer 102 is formed on the substrate 101. However, when removal is not considered, a part of the substrate 101 can be changed to an adhesive layer, and the sheet 100 for a pen input device can be configured to be attached to the surface of the display screen 202D or the like through this adhesive layer. Additionally, an adhesive layer can be provided on the side of the substrate 101 opposite to the side where the elastic material layer 102 is formed, and the sheet 100 for a pen input device can be configured to be attached to the surface of the display screen 202D or the like through this adhesive layer.

[0113] Hereinafter, with reference to the drawings, other examples of specific configuration examples (structural examples) of the sheet for a pen input device of the first embodiment will be described as modification examples.

[0114] <First Modification Example> Figure 14 It is a conceptual diagram for explaining a specific configuration example (structural example) of the sheet 100A for a pen input device of the first modification example. Here Figure 14 In the example of the sheet 100A for a pen input device, the same component symbols are added to the same components as those of the sheet 100 for a pen input device of the first embodiment described above, and the detailed description thereof is omitted.

[0115] The sheet 100A for a pen input device of this first modification example is configured by removing the substrate 101 from the sheet 100 for a pen input device of the first embodiment. That is, in the sheet 100A for a pen input device of this first modification example, the sheet 100A for a pen input device is constituted by the elastic material layer 102 alone.

[0116] Even with the configuration as described above, similarly, when writing input is performed on the sheet 100A for a pen input device of this first modification example with an electronic pen, by pressing the sheet 100A with the hand or tape in such a way that the sheet 100A for a pen input device does not move, the same feeling (writing feel or writing sensation) as that of the sheet 100 for a pen input device of the first embodiment described above can be obtained.

[0117] <Second Modification Example> Figure 15 It is a conceptual diagram for explaining a specific configuration example (structural example) of the sheet 100B for a pen input device of the second modification example. Here Figure 15In the sheet 100B for a pen input device of the example, similarly, for the components that are the same as those of the sheet 100 for a pen input device of the first embodiment described above, the same reference numerals are attached, and the detailed description thereof is omitted.

[0118] The sheet 100B for a pen input device of this second modification example is an example in which the base material 101 of the sheet 100 for a pen input device of the first embodiment is changed to an adhesive layer 103. That is, the sheet 100B for a pen input device of this second modification example, as shown in Figure 15 is constituted by an elastic material layer 102 and an adhesive layer 103 provided on the surface of the elastic material layer 102 on the side of the position detection device 300. In addition, the sheet 100B for a pen input device is attached to the upper surface of the glass top plate 500 of the display screen 202D of the flat information terminal 200 through the adhesive layer 103.

[0119] In the configuration of the second modification example as described above, similarly, when writing input is performed on the sheet 100B for a pen input device with an electronic pen, since the sheet 100B for a pen input device is attached to the upper surface of the glass top plate 500, it is not necessary to press the sheet 100B with the hand or tape, and the same feeling (writing feel or writing sensation) as that of the sheet 100 for a pen input device of the first embodiment described above can be obtained.

[0120] <Third Modification Example> Figure 16 FIG. is a conceptual diagram for explaining a specific configuration example (structural example) of the sheet 100C for a pen input device of the third modification example. Here Figure 16 In the sheet 100C for a pen input device of the example, for the components that are the same as those of the sheet 100 for a pen input device of the first embodiment described above, the same reference numerals are attached, and the detailed description thereof is omitted.

[0121] The sheet 100C for a pen input device of this third modification example is an example in which an adhesive layer 103C is added to the surface of the base material 101 of the sheet 100 for a pen input device of the first embodiment above, which is opposite to the side of the elastic material layer 102.

[0122] The sheet 100C for a pen input device of this third modification example, as shown in Figure 16 is configured such that an adhesive layer 103C is provided on the side of the base material 101 opposite to the surface of the elastic material layer 102 (the side of the position detection device 300). In addition, the sheet 100C for a pen input device is attached and provided on the upper surface of the glass top plate 500 of the display screen 202D of the flat information terminal 200 through the adhesive layer 103.

[0123] When writing input is performed with an electronic pen on the sheet 100C for a pen input device according to the third modified example configured as described above, the same feel (writing feel or writing sensation) as that of the sheet 100 for the pen input device of the first embodiment described above can be obtained.

[0124] In addition, in the sheet 100 for a pen input device of the first embodiment described above, the case where the second uneven pattern PT2 is formed in the second layer portion 1022 so as to overlap with the first uneven pattern PT1 has been described. However, regarding the second uneven pattern PT2, when considered as being divided into "an uneven pattern composed of the convex portion P2a formed on the convex portion P1 of the first uneven pattern PT1 and the concave portions around it" and "an uneven pattern composed of the convex portion P2b formed on the concave portion C1 of the first uneven pattern PT1 and the concave portions around it", the uneven pattern composed of the convex portion P2a formed on the convex portion P1 of the first uneven pattern PT1 and the concave portions around it can be regarded as a layer portion different from the second layer portion 1022. In this case, the elastic material layer 102 can be provided with three layer portions.

[0125] [Configuration example of the sheet 100D for a pen input device of the second embodiment] In the sheet 100 for a pen input device of the first embodiment described above, the first uneven pattern and the second uneven pattern are formed so as to overlap in the second layer portion 1022 of the elastic material layer 102. However, the first uneven pattern and the second uneven pattern can also be formed in different layer portions of an elastic material layer having a plurality of layer portions. The sheet 100D for a pen input device of the second embodiment is one example of such a configuration.

[0126] Figure 17 And Figure 18 is a conceptual diagram for explaining the configuration example of the sheet 100D for a pen input device of this second embodiment. In Figure 17 the sheet 100D for a pen input device is shown in a sectional view in the same manner as Figure 8 This sheet 100D for a pen input device of the second embodiment is fixed to a tablet frame or a smooth glass top plate 500 that serves as a support and is used as a display device through a thin adhesive layer 103. In addition, in Figure 17 the position detection device 300 is omitted.

[0127] This sheet 100D for a pen input device of the second embodiment is composed of an adhesive layer 103D and an elastic material layer 102D disposed on this adhesive layer 103D, as shown in Figure 17

[0128] As an elastic material, the elastic material layer 102D uses a PVC (polyvinyl chloride) sheet with a film thickness of 0.1 mm in this example. In addition, in this second embodiment, the elastic material layer 102D is configured to have a multi-layered layer portion with different configurations (structures) in its thickness direction. In this example, it is configured to have a first layer portion 1021D on the adhesive layer 103D side, a second layer portion 1022D formed on the first layer portion 1021D on the side opposite to the adhesive layer 103D side, and a third layer portion 1023 formed on the second layer portion 1022D.

[0129] Here, as an example of different configurations (structures) in the first layer portion 1021D, the second layer portion 1022D, and the third layer portion 1023, the density per unit volume of each other and / or the hardness per unit volume of each other are set to be different. The elastic material layer 102D is disposed on one surface of the sheet-like adhesive layer 103D, and the exposed surface 102DS on the side of the elastic material layer 102D opposite to the adhesive layer 103D side is set as the writing input surface for the electronic pen 1.

[0130] In the sheet 100D for a pen input device of the second embodiment, the second layer portion 1022D of the elastic material layer 102D is a layer portion made of uniform PVC.

[0131] In addition, the first layer portion 1021D of the elastic material layer 102D is configured to have a first concavo-convex pattern PTD1 in which concave portions CD1 and convex portions PD1 alternately appear along a direction orthogonal to the thickness direction of the elastic material layer 102D (the direction of the plane parallel to the sheet surface of the first layer portion 1021D). This first concavo-convex pattern PTD1 is configured in the same way as the first concavo-convex pattern PT1 of the sheet 100 for a pen input device of the first embodiment and is a main important factor for selecting the writing feel of the sheet 100D for a pen input device of this second embodiment.

[0132] In this example, the convex portion PD1 of the first concavo-convex pattern PTD1 of the first layer portion 1021D is constituted by a hard member 1021Da made of a material harder than the second layer portion 1022D. In this example, this hard member 1021Da is constituted by a UV (Ultra Violet) curable material. In this example, the hard member 1021Da is formed as if Figure 18The general lattice pattern shown in []. Moreover, in this example, the concave portion CD1 of the first concavo-convex pattern PTD1 of the first layer portion 1021D is set as a space (i.e., a space composed of air) 1021Db that is not filled with material. In this case, the front end of the convex portion PD1 of the first concavo-convex pattern PTD1 of the first layer portion 1021D on the adhesive layer 103D side is set to abut against one of the surfaces of the adhesive layer 103D. Thus, since the first layer portion 1021D is provided with the first concavo-convex pattern PTD1 having the space 1021Db with air in the concave portion CD1, it becomes a layer having elasticity in the thickness direction.

[0133] As can be generally understood from the above configuration, in this example, the first layer portion 1021D and the second layer portion 1022D are configured to have different densities and hardnesses per unit volume from each other. In addition, in Figure 18 [], in order to more clearly indicate the hard member 1021Da, it is indicated by a thick black line. However, this hard member 1021Da can also be a transparent material.

[0134] In addition, the third layer portion 1023D of the elastic material layer 102D is set as a layer portion of the second concavo-convex pattern PTD2 formed on the second layer portion 1022D. The convex portion PD2 of this second concavo-convex pattern PTD2 is set to be integrated with the second layer portion 1022D and is formed of PVC. In addition, the concave portion CD2 is set as a space that is not filled with material. That is, at the exposed surface 102DS of the elastic material layer 102D on the side opposite to the adhesive layer 103D side, the third layer portion 1023D is in an exposed state.

[0135] Moreover, in this second embodiment as well, the second concavo-convex pattern PTD2 of the third layer portion 1023D of the elastic material layer 102D is configured to have a smaller average interval of concavities and convexities than the average interval of the concavities and convexities of the first concavo-convex pattern PTD1, and has smaller concavities and convexities than the concavities and convexities of the first concavo-convex pattern PTD1.

[0136] The second concavo-convex pattern PTD2 of this third layer portion 1023D, like the second concavo-convex pattern PT2 of the pen input device sheet 100 of the above first embodiment, functions to "disperse the sharp peak waveform of the vibration frequency characteristic of the dynamic friction coefficient of the pen input device sheet 100D generated by the concavities and convexities of the first concavo-convex pattern PTD1, and form a peak waveform with a broadened vibration frequency distribution", and has an anti-glare property in the pen input device sheet 100D, functioning to improve the visual recognition of the displayed image.

[0137] One example of the manufacturing method of the sheet 100D for a pen input device according to the second embodiment is as follows. The first input device PTD1 of the first layer portion 1021D of the elastic material layer 102D of the sheet 100D for a pen input device according to the second embodiment is formed as follows.

[0138] On the surface of the second layer portion 1022D of the PVC sheet-like elastic material layer 102D on the side where the adhesive layer 103D is provided, by UV-curable ink (UV-curable type ink), as shown in Figure 18 a grid pattern corresponding to the grid pattern of the first concavo-convex pattern PTD1 is UV-printed, and the grid pattern of the hard member 1021Da is formed by UV curing. In this case, in this example, the grid pattern formed by the hard member 1021Da is formed in a state where the lines formed by the UV-curable ink forming the grid are inclined at 45 degrees with respect to the horizontal and vertical directions of the rectangular position detection area.

[0139] At this time, the portion of the air space 1021Db corresponding to "the position where the UV-curable ink of the hard member 1021Da that is not UV-printed does not exist on the second layer portion 1022D" becomes the concave portion CD1 of the first concavo-convex pattern PTD1 of the first layer portion 1021D of the elastic material layer 102D, and the portion of the hard member 1021Da corresponding to the position where the UV-curable ink exists becomes the convex portion PD1 of the first concavo-convex pattern PTD1 of the first layer portion 1021D of the elastic material layer 102D.

[0140] The second concavo-convex pattern PTD2 on the exposed surface 102DS side of the second layer portion 1022D of the elastic material layer 102D of the sheet 100D for a pen input device according to the second embodiment is formed, for example, in the same manner as in the first embodiment by using a transfer film member. In this case, in the transfer film member, the concavo-convex pattern corresponding to the second concavo-convex pattern PTD2 is formed of a material harder than the material of the second layer portion 1022D of the elastic material layer 102D, and in a state where the second layer portion 1022D is softened by heat or the like, the transfer film member is pressed and attached, thereby forming the second concavo-convex pattern PTD2. The formation of this second concavo-convex pattern PTD2 can be performed either before or after the formation of the first layer portion of the first concavo-convex pattern PTD1.

[0141] In this case, the second concavo-convex pattern PTD2 is formed with an average pitch of concavities and convexities smaller than the average pitch of the concavities and convexities of the first concavo-convex pattern PTD1, and is formed as concavities and convexities smaller in size than the concavities and convexities of the first concavo-convex pattern PTD1, which is the same as in the first embodiment.

[0142] Moreover, this second concavo-convex pattern PTD2 serves to "disperse the sharp peak waveform of the vibration frequency characteristic of the dynamic friction coefficient of the sheet 100D for a pen input device generated by the concavo-convexities of the first concavo-convex pattern PTD1, and form a peak waveform with a broadened vibration frequency distribution", and has an anti-glare property, serving to improve the visual recognition of the displayed image. In this regard, it is the same as the first embodiment.

[0143] After that, by attaching a sheet-like adhesive layer 103D to the surface of the first layer portion 1021D of the elastic material layer 102D of the sheet 100D for a pen input device of this second embodiment, which is opposite to the side of the second layer portion 1022D, the sheet 100D for a pen input device of the second embodiment is formed.

[0144] In the sheet 100D for a pen input device of this second embodiment, in order to make the vibration frequency characteristic of its dynamic friction coefficient match the vibration frequency characteristic of the dynamic friction coefficient when "a pencil is moved on a copying paper" (refer to Figure 4 (A), Figure 5 (A), Figure 6 (A) and Figure 7 (A)), and present the maximum value of the peak waveform of the vibration of the dynamic friction coefficient in the frequency range of 17 Hz ± 5 Hz, the line width w (refer to Figure 18 ) of the UV curable ink for the lattice pattern for forming the first concavo-convex pattern PTD1 and the formation pitch Pt (refer to Figure 18 ) of the lattice of the lattice pattern are selected.

[0145] In this second embodiment, the line width w of the UV curable ink is set to w = 0.11 mm to 0.15 mm, and the formation pitch Pt of the lattice of the lattice pattern is set to Pt = 0.4 mm to 0.5 mm, and the lattice pattern is formed by the UV curable ink.

[0146] When writing input is performed on the surface of the exposed surface 102DS of the second layer portion 1022D of the sheet 100D for a pen input device of this second embodiment at a speed of 10 mm / second in this example while applying a specific pen pressure with the electronic pen 1, the same as the case of Figure 4 (A) to Figure 7 (A), it is confirmed that the characteristic of "there is a maximum value of the peak waveform of the vibration of the dynamic friction coefficient in the range of the frequency of 17 Hz ± 5 Hz in the vibration frequency characteristic of the dynamic friction coefficient" can be obtained.

[0147] In addition, it was confirmed that when the user holds the electronic pen 1 and performs writing input on the sheet 100D for the pen input device of this second embodiment, a feeling (writing feel or writing sensation (especially the roughness)) equivalent or similar to that when writing input is performed on copy paper with a pencil can be obtained.

[0148] Similarly, in the sheet 100D for the pen input device of the above-described second embodiment, when writing input is performed on the sheet 100D for the pen input device with the electronic pen 1, a feeling (writing feel or writing sensation) the same as that when writing input is performed on copy paper with a pencil can be obtained. In addition, the roughness during writing in the relationship between the pencil and the paper can also be obtained, and an antiglare effect is provided, which can improve the visual recognition of the displayed image.

[0149] Similarly, in the sheet 100D for the pen input device of this second embodiment, a modification example similar to the modification example of the sheet 100 for the pen input device of the above-described first embodiment, in which a part of the adhesive layer 103D is changed to a base material or the like, can also be adopted.

[0150] [Configuration Example of Sheet 100E for Pen Input Device of Third Embodiment] Figure 19 It is a conceptual diagram for explaining a specific configuration example (structural example) of the sheet 100E for the pen input device of the third embodiment. In Figure 19 , the sheet 100E for the pen input device is shown in a sectional view in the same manner as Figure 8 and Figure 17 This sheet 100E for the pen input device of the third embodiment corresponds to a configuration example in which "the elastic material is changed to a polyurethane resin from the sheet 100D for the pen input device of the second embodiment, the concave portion CD1 of the first concavo-convex pattern PTD1 of the first layer portion 1021D is filled with the elastic material, and further, a base material 101E is provided instead of the adhesive layer 103D". In this example, the base material 101E is formed of a PET resin.

[0151] Similarly, in this sheet 100E for the pen input device of the third embodiment, the elastic material layer 102E has a multi-layered layer portion with different configurations (structures) in its thickness direction, similar to the second embodiment. In addition, in this example, as the multiple layer portions of the elastic material layer 102E, a first layer portion 1021E on the side of the base material 101E, a second layer portion 1022E formed on the first layer portion 1021E on the side opposite to the base material 101E side, and a third layer portion 1023E formed on the second layer portion 1022E are configured.

[0152] In the sheet 100E for a pen input device according to this third embodiment, as an example in which the first layer portion 1021E, the second layer portion 1022E, and the third layer portion 1023E have different configurations (structures), the density per unit volume of each other and / or the hardness per unit volume of each other are made different.

[0153] In Figure 19 In the example of the sheet 100E for a pen input device according to the third embodiment, the second layer portion 1022E of the elastic material layer 102E is provided as a layer in which only a uniform polyurethane resin exists. In addition, the first layer portion 1021E is configured to have a first concavo-convex pattern PTE1 in which recesses CE1 and protrusions PE1 alternately appear along a direction orthogonal to the thickness direction of the layer (a direction of a plane parallel to the exposed surface 102ES of the sheet 100E for a pen input device).

[0154] The first concavo-convex pattern PTE1 of the first layer portion 1021E of the elastic material layer 102E in the sheet 100E for a pen input device according to this third embodiment is provided as a lattice pattern (see Figure 18 ) formed of a UV-curing material, which is formed in the same manner as the first concavo-convex pattern PTD1 of the first layer portion of the sheet 100D for a pen input device according to the second embodiment, on the base material 101E. In addition, in this case, the recesses CE1 of the first concavo-convex pattern PTE1 of the first layer portion 1021E are provided with a configuration in which the same polyurethane resin as that of the second layer portion 1022E is filled.

[0155] That is, the protrusions PE1 of the first concavo-convex pattern PTE1 are constituted by a hard member 1021Ea made of a UV-curing material, and the recesses CE1 are provided with a configuration in which they are filled with an elastic material that is sufficiently softer than the UV-curing material (in this example, polyurethane resin). In this third embodiment, the difference from the second embodiment is that the recesses CE1 of the first concavo-convex pattern PTE1 of the first layer portion 1021E are not air spaces but are provided with a configuration filled with polyurethane that is softer than the hard member 1021Ea made of a UV-curing material. In this way, since the first layer portion 1021E is provided with the first concavo-convex pattern PTE1 in which the recesses CE1 are filled with an elastic material, it becomes a layer having elasticity in the thickness direction.

[0156] The third layer portion 1023E of the elastic material layer 102E is provided as a layer portion of the second uneven pattern PTE2 formed on the second layer portion 1022E. The convex portions PE2 of this second uneven pattern PTE2 are provided to be integrated with the second layer portion 1022E in this example and are formed of a polyurethane resin. In addition, the concave portions CE2 of the second uneven pattern PTE2 are provided as spaces not filled with a material. Moreover, at the exposed surface 102ES on the side of the elastic material layer 102E opposite to the substrate 101E side, the third layer portion 1023E is in an exposed state.

[0157] Moreover, also in this third embodiment, similarly, the second uneven pattern PTE2 of the third layer portion 1023E of the elastic material layer 102E is configured to have a smaller average pitch of unevenness than the average pitch of the unevenness of the first uneven pattern PTE1 and to have smaller unevenness than the unevenness of the first uneven pattern PTE1.

[0158] The second uneven pattern PTE2 of the third layer portion 1023E of the elastic material layer 102E of the sheet 100E for a pen input device in this third embodiment is formed by using a transfer film member, similarly to the first embodiment. In this case, at the transfer film member, an uneven pattern corresponding to the second uneven pattern PTE2 is formed of a cured resin material harder than the polyurethane resin or the like, and by pressing and attaching the transfer film member from the writing input surface side of the elastic material layer 102E, the second uneven pattern PTE2 is formed.

[0159] The second uneven pattern PTE2 of this third layer portion 1023E, similarly to the second uneven pattern PT2 of the sheet 100 for a pen input device in the above-described first embodiment, functions to "disperse the sharp peak waveform of the vibration frequency characteristic of the kinetic friction coefficient of the sheet 100E for a pen input device generated by the unevenness of the first uneven pattern PTE1 and form a peak waveform with a broadened vibration frequency distribution", and moreover, has an antiglare property in the sheet 100E for a pen input device and functions to improve the visual recognition of the displayed image.

[0160] Also in the sheet 100E for a pen input device in the above-described third embodiment, similarly, when writing input is performed on the sheet 100E for a pen input device with an electronic pen 1, the same feeling (writing feel or writing sensation) as when writing input is performed on copy paper with a pencil can be obtained. In addition, the roughness during writing in the relationship between the pencil and the paper can also be obtained, and moreover, it has an antiglare effect and can improve the visual recognition of the displayed image.

[0161] In addition, in the sheet 100E for a pen input device of this third embodiment as well, similarly, a modification example similar to the modification example of the sheet 100 for a pen input device of the above-described first embodiment in which a part of the base material 101E is changed to an adhesive layer or the like can be adopted.

[0162] [Configuration Example of Sheet 100F for Pen Input Device of Fourth Embodiment] Figure 20 It is a conceptual diagram for explaining a specific configuration example (structural example) of the sheet 100F for a pen input device of the fourth embodiment. In Figure 20 , the sheet 100F for a pen input device is shown in a sectional view in the same manner as Figure 8 , Figure 17 and Figure 19 are shown.

[0163] In this sheet 100F for a pen input device of the fourth embodiment, similar to the sheet 100E for a pen input device of the third embodiment, the second layer portion 1022F of the elastic material layer 102F is set to a layer in which only a uniform polyurethane resin exists. However, in this sheet 100F for a pen input device of the fourth embodiment, on the exposed surface 102FS side of the second layer portion 1022F, a layer portion corresponding to "the third layer portion 1023E formed by the second concavo-convex pattern PTE2 of the sheet 100E for a pen input device of the third embodiment" is not formed. Instead, in this sheet 100F for a pen input device of the fourth embodiment, it is configured such that "the second concavo-convex pattern PTF2 is provided by forming convex portions PF2a and convex portions PF2b on the upper surface of the convex portions PF1 and the bottom surface of the concave portions CF1 of the first concavo-convex pattern PTF1 constituting the first layer portion 1021F", respectively. That is, in this sheet 100F for a pen input device of the fourth embodiment, the second concavo-convex pattern PTF2 is formed so as to overlap with the first concavo-convex pattern PTF1.

[0164] In this fourth embodiment, the first layer portion 1021F forms a lattice pattern made of a UV-curable material on the base material 101F, similar to the sheet 100E for a pen input device of the third embodiment, and forms the first concavo-convex pattern PTF1. In addition, in this fourth embodiment, on the lines made of the UV-curable material constituting the first concavo-convex pattern PTF1, that is, on the upper surface of the convex portions PF1, convex portions PF2a of the second concavo-convex pattern PTF2 are formed, and in the space portion where the UV-curable material does not exist, that is, on the bottom surface of the concave portions CF1, convex portions PF2b of the second concavo-convex pattern PT F2 are formed. In addition, as in Figure 20As shown generally in [Fig.], the concave portion CF1 of the first concavo-convex pattern PTF1 is filled with a polyurethane resin integrated with the second layer portion 1022F, in the same manner as in the third embodiment.

[0165] In addition, although the sheet 100 for a pen input device of the first embodiment has been described, regarding the second concavo-convex pattern PTF2, when considered by distinguishing it into "a concavo-convex pattern composed of a convex portion PF2a formed on the convex portion PF1 of the first concavo-convex pattern PTF1 and the concave portions around it" and "a concavo-convex pattern composed of a convex portion PF2b formed on the concave portion CF1 of the first concavo-convex pattern PTF1 and the concave portions around it", the concavo-convex pattern composed of the convex portion PF2a formed on the convex portion PF1 of the first concavo-convex pattern PTF1 and the concave portions around it can be regarded as a layer portion different from the first layer portion 1021F. In this case, the elastic material layer 102F can be provided with three layer portions.

[0166] The second concavo-convex pattern PTF2 of the sheet 100F for a pen input device of this fourth embodiment also functions in the same manner as the second concavo-convex patterns PT2 to PTE2 of the sheets 100 to 100E for pen input devices of the above-described first to third embodiments, that is, it functions to "disperse the sharp peak waveform of the vibration frequency characteristics of the dynamic friction coefficient of the sheet 100F for a pen input device generated by the concavo-convexities of the first concavo-convex pattern PTF1, and form a peak waveform with a broadened vibration frequency distribution". However, in the case of this fourth embodiment, there is no anti-glare effect formed by the second concavo-convex pattern PTF2.

[0167] In addition, in the sheet 100F for a pen input device of this fourth embodiment as well, similarly, a modification example similar to the modification example of the sheet 100 for a pen input device of the first embodiment, in which a part of the base material 101F is changed to an adhesive layer or the like, can be adopted.

[0168] [Other embodiments or modification examples] Regarding the sheet for a pen input device of the above-described embodiment, although the combination of the writing tool and the writing medium, which aims to obtain a writing feel with an electronic pen, is a combination of a pencil and copy paper, the combination of the target writing tool and the writing medium is not limited to this. For example, it can also be various combinations such as a ballpoint pen and report paper.

[0169] In addition, in the second to fourth embodiments described above, the hard members 1021Da to 1021Fa for forming "the first concavo-convex patterns PTD1 to PTF1 formed at the first layer portions 1021D to 1021F of the elastic material layers 102D to 102F" are formed by UV printing using UV-curable ink. However, the method for forming the hard members is not limited to UV printing, and any method can be used as long as it can form the hard members. In addition, the concavo-convex shape can also be formed by a method of deforming the surface of the substrate. Similarly, regarding the transfer concavo-convex portions 402 formed on the base film 401 of the transfer film member 400, the method is not limited to the UV printing method using UV-curable ink.

[0170] In addition, the hard members 1021Da to 1021Fa for constituting the first concavo-convex pattern are formed as a lattice pattern in the above-described embodiment. However, it is not limited to the lattice pattern. For example, short linear UV-curable resin may be disposed on the substrate. Alternatively, dot-like UV-curable resin may be disposed in the first layer portions 1021D to 1021F of the elastic material layer or on the substrate.

[0171] In addition, regarding the sheet for a pen input device, when it is assumed to be disposed in a tablet-type terminal not disposed on the display screen, the adhesive layer, the substrate, and the elastic material layer can be constituted by non-optical materials, and when disposed on the display screen, they are constituted by materials having optical characteristics.

[0172] In addition, in the above-described embodiment, the electronic pen and the position detection device are constituted by the electromagnetic induction method. However, the electronic pen and the position detection device used in the sheet for a pen input device of the present invention are not limited to the electromagnetic induction method, and may be any method such as the electrostatic coupling method or other methods.

Reference Signs

[0173] 1: Electronic pen; 1R: Resonance circuit; 100, 100A, 100B, 100C, 101D, 101E, 101F: Sheets for pen input device; 101, 101E, 101F: Base materials; 102, 102A, 102B, 102C, 102D, 102E, 102F: Elastic material layers; 102S: Exposed surface; 103, 103C, 103D: Adhesive layers; 1021, 1021D, 1021E, 1021F: First layer portions; 1022, 1022D, 1022E, 1022F: Second layer portions; 1023, 1023D, 1023E: Third layer portions; PT1, PTD1, PTE1, PTF1: First concavo-convex pattern; PT2, PTD2, PTE2, PTF2: Second concavo-convex pattern; C1, CD1, CE1, CF1: Recesses of the first concavo-convex pattern; P1, PD1, PE1, PF1: Protrusions of the first concavo-convex pattern; CD2, CE2: Recesses of the second concavo-convex pattern; P2a, P2b, PD2, PE2, PF2a, PF2b: Protrusions of the second concavo-convex pattern; HT: Maximum height of the concavities and convexities in the contour curve at the reference length; H1: Height of the protrusion of the first concavo-convex pattern; H2: Height of the protrusion of the second concavo-convex pattern; d1: Average interval of the concavities and convexities of the contour curve elements at the reference length; 1021Da, 1021Ea, 1021Fa: Hard materials; 1021Db, 1021Eb, 1021Fb: Spaces; 200: Flat panel information terminal; 201: Position detection device; 202: Display device; 202D: Display screen; 300: Position detection device; 310: Position detection sensor; 400: Transfer film member; 401: Base film; 402: Transfer concavo-convex portions; 500: Glass top plate.

Claims

1. A sheet for a pen input device, which is disposed on a position detection area of a position detection sensor, includes an elastic material layer having elasticity, and has a writing input surface side for writing input by an electronic pen on a side of the elastic material layer opposite to the position detection sensor side. The elastic material layer has: a first concavo-convex pattern formed along a direction orthogonal to the thickness direction of the elastic material layer; and a second concavo-convex pattern formed along a direction orthogonal to the thickness direction of the elastic material layer and being a concavo-convex pattern different from the first concavo-convex pattern.

2. The sheet for a pen input device according to claim 1, wherein the first concavo-convex pattern repeats concavities and convexities such that an average interval between the concavities and convexities is a specific value.

3. The sheet for a pen input device according to claim 1, wherein the second concavo-convex pattern repeats concavities and convexities such that an average interval between the concavities and convexities is a specific value, or is composed of irregularly arranged concavities and convexities.

4. The sheet for a pen input device according to claim 1, wherein the second concavo-convex pattern is formed such that an average interval between the concavities and convexities is smaller than that of the first concavo-convex pattern.

5. The sheet for a pen input device according to claim 1, wherein the second concavo-convex pattern is formed by concavities and convexities smaller in size than those of the first concavo-convex pattern.

6. The sheet for a pen input device according to claim 1, wherein the elastic material layer has a plurality of layer portions in the thickness direction, and includes a first layer portion on the position detection sensor side and a second layer portion on the writing input surface side, and the second concavo-convex pattern is formed on the writing input surface side of the second layer portion.

7. The sheet for a pen input device according to claim 1, wherein the elastic material layer has a plurality of layer portions in the thickness direction, and includes a first layer portion on the position detection sensor side and a second layer portion on the writing input surface side, the first concavo-convex pattern is formed on the second layer portion, and the second concavo-convex pattern is formed on a bottom surface of a concave portion and / or an upper surface of a convex portion of the first concavo-convex pattern.

8. The sheet for a pen input device according to claim 1, wherein the elastic material of the elastic material layer is polyurethane resin.

9. The sheet for a pen input device according to claim 1, wherein the elastic material of the elastic material layer is polyvinyl chloride resin.

10. The sheet for a pen input device according to claim 1, wherein a base material layer is disposed on a surface on the elastic material layer side between the position detection sensor and the elastic material layer.

11. The sheet for a pen input device according to claim 1, wherein an adhesive layer is disposed on a surface on the elastic material layer side between the position detection sensor and the elastic material layer.

12. The sheet for a pen input device according to claim 10, wherein an adhesive layer is disposed on a surface on the base material layer side between the position detection sensor and the base material layer.

13. The thin sheet for a pen input device according to claim 1, wherein: The concave portions of the first uneven pattern are not filled with material but are filled with air.

14. The thin sheet for a pen input device according to claim 1, wherein: The second uneven pattern is exposed on the writing input surface side.

15. The thin sheet for a pen input device according to claim 1, wherein: The elastic material layer has a plurality of layer portions in the thickness direction, and includes a first layer portion on the side of the position detection sensor and a second layer portion on the writing input surface side, and the first uneven pattern is formed in the first layer portion.

16. The thin sheet for a pen input device according to claim 15, wherein: The convex portions of the first uneven pattern are constituted by members whose material is harder than the material of the concave portions of the first uneven pattern.

17. The thin sheet for a pen input device according to claim 16, wherein: The convex portions of the first uneven pattern are constituted by members whose material is harder than the material of the layer portion where the first uneven pattern is not formed.

18. The thin sheet for a pen input device according to claim 16 or 17, wherein: The member made of a hard material is constituted by an ultraviolet curable resin.

19. The thin sheet for a pen input device according to claim 1, wherein: The first uneven pattern is a lattice pattern.

20. The thin sheet for a pen input device according to claim 18, wherein: The first uneven pattern is a lattice pattern, The member made of a hard material is formed into a lattice pattern that fits with the first uneven pattern.

21. The thin sheet for a pen input device according to claim 1, wherein: The first uneven pattern is a dot pattern.

22. The thin sheet for a pen input device according to claim 18, wherein: The first uneven pattern is a dot pattern, The member made of a hard material is formed into a dot pattern that fits with the first uneven pattern.

23. The thin sheet for a pen input device according to claim 5, wherein: The second uneven pattern is exposed on the writing input surface side and has an antiglare property for preventing light reflection on the writing surface.

Images