Sheet for pen input device

Abstract

Provided is a sheet for a pen input device with which, when performing written input using an electronic pen, it is possible to obtain a writing feel equivalent to or approximating that when writing on a writing medium such as paper using a writing implement such as a pencil.　The sheet for a pen input device comprises a resilient material layer which is resilient, is disposed on a position detection region of a position detecting sensor, and includes a plurality of layer parts in a thickness direction, and in which the side of the resilient material layer on the opposite side to the position detecting sensor serves as a surface side for written input by means of the electronic pen. The resilient material layer includes: a first protruding / recessed pattern formed in a direction perpendicular to the thickness direction of the resilient material layer; and a second protruding / recessed pattern which is formed in a direction perpendicular to the thickness direction of the resilient material layer and which is a different protruding / recessed pattern from the first protruding / recessed pattern.

Description

Technical Field

[0001] The present invention relates to a sheet for a pen input device, which is used in a pen input device and comes into contact with the pen tip of an electronic pen.

Background Art

[0002] In recent years, pen input devices have come to be used as input devices for small electronic devices such as high-performance mobile phone terminals called smartphones and pad-type terminals. A pen input device includes an electronic pen and a position detection device that detects an indicated position indicated by the electronic pen. Electronic pens used in such pen input devices for small electronic devices have been increasingly miniaturized, and many of their pen tips have the same diameter as those of commercially available ballpoint pens.

[0003] Against this background, there has been an increasing demand for electronic pens that enable input with a writing feel similar to that of writing on paper with a pencil or ballpoint pen. However, the input surface of the input device of the above-described electronic device (the surface on which writing input is performed when the pen tip of the electronic pen is in contact) is hard; in particular, when the electronic device is provided with a display screen, the input surface is a hard surface such as a glass surface. For this reason, it is difficult to obtain a writing feel with an electronic pen on the input surface that is similar to writing on paper with a pencil or ballpoint pen.

[0004] Therefore, for the purpose of improving the writing feel of an electronic pen on an input surface, it has been conventionally practiced to attach a sheet (a sheet for a pen input device) designed to provide the above-described writing feel onto the input surface of a pen input device.

[0005] For example, Patent Document 1 (JP 2014-137640 A) and Patent Document 2 (JP 2014-149817 A) propose a sheet (film) for a pen input device that adjusts the writing feel by controlling the uneven shape of the sheet surface. Furthermore, Patent Document 3 (JP 2006-119772 A) proposes a sheet (film) for a pen input device that provides a writing feel by applying a soft resin coating to the sheet surface. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2014-137640 [Patent Document 2] Japanese Patent Publication No. 2014-149817 [Patent Document 3] Japanese Patent Publication No. 2006-119772 [Overview of the project] [Problems that the invention aims to solve]

[0007] Incidentally, there is a demand to select a target combination of writing instrument and writing medium for the desired writing feel when using an electronic pen, and to obtain a writing feel that is equivalent to or similar to that of the target combination of writing instrument and writing medium. For example, there is a demand to obtain a writing feel equivalent to or similar to that when writing with a pencil on paper such as copy paper, when using an electronic pen.

[0008] However, the methods for adjusting the writing feel by controlling the uneven surface shape of the sheet for a pen input device described in Patent Documents 1 and 2, and the method of coating the surface with a soft resin described in Patent Document 3, have the problem that they cannot reproduce the feel (writing feel or pressure sensation) caused by the indentations of the paper when writing with a pen on paper. Furthermore, Patent Documents 1 and 2 do not consider obtaining a writing feel equivalent to or similar to the writing feel when writing with a predetermined writing instrument on a predetermined writing medium with a predetermined writing force, and therefore cannot solve the above problem.

[0009] In view of the above, the objective of this invention is to provide a sheet for a pen input device that, with a relatively simple configuration, can provide a writing feel equivalent to, or similar to, writing on paper with a pencil when writing with an electronic pen. [Means for solving the problem]

[0010] To solve the above problems, A sheet for a pen input device, which is disposed on the position detection area of ​​a position detection sensor and comprises an elastic material layer having elasticity, wherein the side of the elastic material layer opposite to the position detection sensor side is the writing input surface side for an electronic pen, The elastic material layer has a first uneven pattern formed along a direction perpendicular to the thickness direction of the elastic material layer, and a second uneven pattern formed along a direction perpendicular to the thickness direction of the elastic material layer, and having an uneven pattern different from the first uneven pattern. death, The second uneven pattern is formed such that the average spacing between the uneven surfaces is smaller than that of the first uneven pattern. The present invention provides a sheet for a pen input device characterized by the following features.

[0011] According to the pen input device sheet with the above configuration, when writing with an electronic pen, it is possible to obtain a writing feel that is equivalent to or similar to the writing feel of the combination of writing instrument and writing medium desired by the user. [Brief explanation of the drawing]

[0012] [Figure 1] This figure illustrates an example of a pen input device in which the sheet for pen input devices according to this invention is used. [Figure 2] This figure illustrates an example of an electronic pen that performs writing input on a sheet for a pen input device according to this invention. [Figure 3] This figure illustrates an example of a circuit configuration for a position detection device of a pen input device that uses the sheet for pen input devices according to this invention. [Figure 4] This figure shows an example of the vibration frequency characteristics of the coefficient of dynamic friction in an example of a writing instrument and writing medium targeted by an embodiment of the sheet for a pen input device according to this invention. [Figure 5] This figure shows an example of the vibration frequency characteristics of the coefficient of dynamic friction in an example of a writing instrument and writing medium targeted by an embodiment of the sheet for a pen input device according to this invention. [Figure 6] This figure shows an example of the vibration frequency characteristics of the coefficient of dynamic friction in an example of a writing instrument and writing medium targeted by an embodiment of the sheet for a pen input device according to this invention. [Figure 7] This figure shows an example of the vibration frequency characteristics of the coefficient of dynamic friction in an example of a writing instrument and writing medium targeted by an embodiment of the sheet for a pen input device according to this invention. [Figure 8] This is a cross-sectional view illustrating an example of the configuration of a first embodiment of a sheet for a pen input device according to the present invention. [Figure 9] This figure illustrates the main components of a configuration example of a first embodiment of a sheet for a pen input device according to the present invention. [Figure 10] This figure shows an example of measurement conditions for measuring surface roughness in the first embodiment of the sheet for a pen input device according to this invention. [Figure 11] This figure shows an example of evaluation conditions for evaluating the surface roughness measurement results for the first embodiment of the sheet for a pen input device according to this invention. [Figure 12] This figure shows a table of example surface roughness measurement results for the first embodiment of the sheet for a pen input device according to this invention. [Figure 13] It is a drawing showing a table of examples of various values obtained from surface roughness measurement results for the first embodiment of the sheet for a pen input device according to the present invention. [Figure 14] It is 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 according to the present invention. [Figure 15] It is a drawing for explaining a second modification of the configuration example of the first embodiment of the sheet for a pen input device according to the present invention. [Figure 16] It is a drawing for explaining a third modification of the configuration example of the first embodiment of the sheet for a pen input device according to the present invention. [Figure 17] It is a cross-sectional view for explaining a configuration example of the second embodiment of the sheet for a pen input device according to the present invention. [Figure 18] It is a drawing for explaining the main part of the configuration example of the second embodiment of the sheet for a pen input device according to the present invention. [Figure 19] It is a cross-sectional view for explaining a configuration example of the third embodiment of the sheet for a pen input device according to the present invention. [Figure 20] It is a cross-sectional view for explaining a configuration example of the fourth embodiment of the sheet for a pen input device according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] [Configuration Example of Pen Input Device] A configuration example of an example of a pen input device to which the sheet for a pen input device according to the present invention is applied will be described.

[0014] Figure 1 shows an example of a tablet-type information terminal 200 as an example of a pen input device. In this example, the tablet-type information terminal 200 is equipped with a display device 202, in this example an LCD (Liquid Crystal Display), within the terminal housing, and an electromagnetic induction type position detection device 300 is provided on the lower part (back side) of the display screen 202D of the display device 202. If the display device 202 is not provided, it becomes a pen tablet type terminal, and the position detection device 300 is provided under the top plate of the terminal housing (the top plate that constitutes the input surface of the pen tablet type terminal).

[0015] In the example shown in Figure 1, the position detection device 300, although not shown in Figure 1, includes an electromagnetic induction type position detection sensor having a position detection area corresponding to the display area of ​​the display screen 202D of the display device 202. The position detection sensor is positioned such that the display area of ​​the display screen 202D and its position detection area overlap each other. Therefore, in this example, the tablet-type information terminal 200 is configured such that almost the entire display area of ​​the display screen 202D becomes the position detection area of ​​the position detection sensor.

[0016] Furthermore, the position detection sensor may be provided so that the position detection area corresponds to only a portion of the display area of ​​the display screen 202D, rather than covering almost the entire display area.

[0017] In this example, the tablet-type information terminal 200 is equipped with an electronic pen 1 that provides position indication to the position detection sensor of the position detection device 300 using an electromagnetic induction method. The pen input device sheet 100 of the first embodiment of this invention is attached to the display screen 202D of the tablet-type information terminal 200. In this example, since almost the entire display area of ​​the display screen 202D is the position detection area of ​​the position detection sensor, the pen input device sheet 100 is arranged to cover the entire display area of ​​the display screen 202D. The exposed surface of this pen input device sheet 100 becomes the input surface for position indication by the electronic pen 1, that is, the writing input surface.

[0018] It goes without saying that the pen input device sheet 100 of this embodiment may also be used in the pen tablet type terminal that does not have a display device 202.

[0019] The user places the tip of the core of the electronic pen 1 (pen tip) into contact with the pen input device sheet 100, applies a predetermined pressure to the pen tip, and performs input operations such as drawing lines on the pen input device sheet 100. The position detection device 300 detects the drawing input by the electronic pen 1 on the pen input device sheet 100 and also detects the pressure applied by the electronic pen 1 during the drawing input.

[0020] [Description of an example of the mechanical configuration of electronic pen 1] Figure 2 shows an overview of the electronic pen 1 used in the tablet-type information terminal 200 in this example. The electronic pen 1 in this example is an electromagnetic induction type electronic pen, and a printed circuit board 6 on which a position detection coil 3, a pressure detection unit 4, and electronic components such as a capacitor 5 that, together with the coil 3, constitute a resonant circuit are arranged sequentially in the axial direction and housed in the hollow part of the cylindrical housing 2.

[0021] The coil 3 is wound around a ferrite core 7, which is an example of a magnetic core having an axial through hole 7a, and is housed near the opening 2a on the pen tip side of the housing 2. The pressure detection unit 4 includes a fitting part 9 for fitting the axial portion 82 of the core body 8.

[0022] In this example, the core body 8 has a configuration in which the tip portion 81, which will become the pen tip, and the shaft portion 82 are integrally joined. The core body 8 is inserted into the housing 2 from the shaft portion 82 side through the opening 2a, so as to pass through the through hole 7a of the ferrite core 7. The end of the shaft portion 82 of the core body 8 is then fitted into and held by a fitting portion 9 provided on the writing pressure detection unit 4. When the end of the shaft portion 82 is fitted into the fitting portion 9, the tip portion 81 of the core body 8 protrudes outward from the opening 2a of the housing 2, as shown in Figure 2.

[0023] In the example shown in Figure 2, the pressure detection unit 4 is configured as a variable capacitance capacitor that detects the pressure applied to the tip 81 of the pencil lead 8 as a change in capacitance. It is electrically connected on the printed circuit board 6 to form a resonant circuit together with the coil 3 and capacitor 5.

[0024] In this example, the electromagnetic induction electronic pen 1 interacts with the position detection sensor of the position detection device 300 via a resonant circuit, and based on this, the position detection device 300 detects the coordinates of the position indicated by the electronic pen 1.

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

[0026] [Circuit configuration for position detection and pen pressure detection in a position detection device used with electronic pen 1] Next, an example of the circuit configuration and operation of the position detection device 300, which detects the position indicated by the electronic pen 1 and the pressure (=load) applied to the electronic pen 1, will be explained with reference to Figure 3.

[0027] As shown in Figure 3, in the electronic pen 1, one end of the coil 3 and the other end are connected to the capacitor 5, and a variable capacitance capacitor 4C, which is part of the pressure detection unit 4, is connected in parallel to the coil 3 and the capacitor 5 to form a resonant circuit 1R.

[0028] In this embodiment, the electromagnetic induction type position detection device 300 transmits a signal to the electronic pen 1 via electromagnetic induction coupling, and the electronic pen 1 feeds back the signal received from the position detection device 300 via the resonant circuit 1R.

[0029] The position detection device 300 receives a feedback signal from the resonant circuit 1R of the electronic pen 1 via electromagnetic induction coupling. From the position on the sensor where the received signal is detected, it detects the position on the sensor indicated by the electronic pen 1. It also detects a change in the resonant frequency by detecting a change in the phase change of the signal received from the resonant circuit 1R of the electronic pen 1 via electromagnetic induction coupling, thereby detecting the writing pressure applied to the tip 81 of the core body 8 of the electronic pen 1.

[0030] The position detection device 300 has a position detection sensor 310 formed by stacking an X-axis loop coil group 311 and a Y-axis loop coil group 312 to create a position detection coil. The position detection device 300 is also provided with a selection circuit 313 to which the X-axis loop coil group 311 and the Y-axis loop coil group 312 are connected. This selection circuit 313 sequentially selects one loop coil from the two loop coil groups 311 and 312.

[0031] The position detection device 300 also includes 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. The processing control unit 307 is composed of a microcomputer. The processing control unit 307 controls the selection of the loop coil in the selection circuit 313, the switching of the switching connection circuit 303, and the processing timing in the position detection circuit 305 and the pen pressure detection circuit 306.

[0032] The oscillator 301 generates an AC signal with frequency f0. The oscillator 301 then supplies the generated AC signal to the current driver 302 and the pressure sensitivity detection circuit 306. The current driver 302 converts the AC signal supplied from the oscillator 301 into current and sends it to the switching connection circuit 303. The switching connection circuit 303, under control from the processing control unit 307, switches the connection destination (transmitting terminal T, receiving terminal R) to which the loop coil selected by the selection circuit 313 is connected. Of these connection destinations, the current driver 302 is connected to the transmitting terminal T, and the receiving amplifier 304 is connected to the receiving terminal R.

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

[0034] Each loop coil in the X-axis loop coil group 311 and the Y-axis loop coil group 312 is induced by the radio waves transmitted from the electronic pen 1. The position detection circuit 305 detects the induced voltage generated in the loop coils, i.e., the received signal, converts the detected 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 indicated position in the X-axis and Y-axis directions of the electronic pen 1 based on the digital signal from the position detection circuit 305, i.e., the voltage value of the induced voltage generated in each loop coil.

[0035] Meanwhile, the pressure detection circuit 306 synchronously detects the output signal of the receiving amplifier 304 with the AC signal from the oscillator 301 to obtain a signal with a level corresponding to the phase difference (frequency shift) between them, converts this 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 level of the digital signal from the pressure detection circuit 306, that is, the signal corresponding to the phase difference (frequency shift) between the transmitted radio wave and the received radio wave.

[0036] [Outline of the procedure for creating a sheet for the pen input device according to the embodiment] In the pen input device sheets of several embodiments described below, including the pen input device sheet 100 of the first embodiment, the aim is not only to improve the writing feel when writing on paper, for example, with a writing instrument such as a pencil, but also to enable the user to select a target writing instrument and writing medium for which they wish to obtain a writing feel using an electronic pen, and to obtain a writing feel that is as close as possible to the writing feel when writing with the selected writing instrument on the selected writing medium.

[0037] Before describing an example configuration of the pen input device sheet of this embodiment, we will first outline the procedure for creating the pen input device sheet of this embodiment.

[0038] (1) First, the creator of the sheet for the pen input device of this embodiment selects a combination of a target writing instrument and writing medium from which they wish to obtain a writing feel using an electronic pen.

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

[0040] (3) Next, the time-series change of the dynamic friction coefficient obtained as a measurement result is Fourier transformed to obtain the power spectrum of the change (vibration) of the dynamic friction coefficient over time, i.e., the vibration frequency characteristics of the dynamic friction coefficient. In this embodiment, the frequency distribution of the amplitude of vibration of the dynamic friction coefficient in the obtained vibration frequency characteristics and frequencies that protrude from adjacent frequency ranges are detected, and frequencies that exhibit a peak in the amplitude of vibration, which protrude from the broad waveform of the frequency distribution of the amplitude of vibration, are detected. Note that depending on the combination of writing instrument and writing medium, protruding frequencies may not appear. In such combinations, the maximum value that is the peak of the peak portion constituting the frequency distribution of the amplitude of vibration becomes the peak of the amplitude of vibration.

[0041] (4) Next, in the case of the selected combination of writing instrument and writing medium determined as described above, a sheet for a pen input device according to an embodiment of this invention is created by configuring the selected writing instrument to have a vibration frequency characteristic of the dynamic friction coefficient that matches the vibration frequency characteristic of the dynamic friction coefficient when the selected writing instrument is moved at a predetermined speed on the selected writing medium.

[0042] In other words, the pen input device sheet of this embodiment of the invention is configured such that when an electronic pen is moved on the writing input surface of the sheet of this embodiment of the invention at the same speed as when the coefficient of dynamic friction was measured for a selected combination of writing instrument and writing medium, the vibration frequency characteristics of the coefficient of dynamic friction are matched to the vibration frequency characteristics of the coefficient of dynamic friction obtained for the selected combination of writing instrument and writing medium.

[0043] In this case, as a method for matching the vibration frequency characteristics of the two dynamic friction coefficients, in this embodiment, in particular, the frequency at which the amplitude of vibration of the dynamic friction coefficient exhibits a peak in the vibration frequency characteristics of the dynamic friction coefficient obtained for the pen input device sheet is within the range of the frequency fp±ΔHz at which the amplitude of vibration of the dynamic friction coefficient exists in the vibration frequency characteristics of the dynamic friction coefficient obtained for the selected combination of writing instrument and writing medium.

[0044] Here, the value of Δ in the frequency fp±ΔHz is determined according to the range of pressure the user applies to the tip of the electronic pen 1 when writing. Furthermore, considering that there may be various hardnesses at the tip of the writing instrument that comes into contact with the writing medium, that is, in this embodiment, there may be several types of pencil lead hardness, the value of Δ is determined by considering the differences in the frequencies that exhibit peaks corresponding to these differences in hardness. Note that not only pencils, but also fountain pens, for example, have differences in tip hardness, and ballpoint pens also have differences in the size of the ball at the tip (thinness of the tip), and the value of Δ is determined according to these differences.

[0045] When writing input was performed using an electronic pen on the sheet for the pen input device of this embodiment of the invention, sensory evaluation confirmed that a writing feel equivalent to or similar to that of the selected combination of writing instrument and writing medium was obtained.

[0046] As described above, in the pen input device sheet of this embodiment, by focusing on the vibration frequency characteristics of the coefficient of dynamic friction obtained in a combination of writing instrument and writing medium, and configuring the pen input device sheet so that the vibration frequency characteristics of the coefficient of dynamic friction of the pen input device sheet of the embodiment match the vibration frequency characteristics of the coefficient of dynamic friction obtained in a selected target combination of writing instrument and writing medium, it is possible to obtain a writing feel that is equivalent to or approximates that of the selected combination of writing instrument and writing medium.

[0047] Furthermore, in the pen input device sheet of this embodiment of the invention, the sheet is configured such that the frequency at which the amplitude of vibration of the dynamic friction coefficient has a peak in the vibration frequency characteristics of the dynamic friction coefficient of the pen input device sheet falls within the frequency range at which the amplitude of vibration of the dynamic friction coefficient has a peak in the vibration frequency characteristics of the dynamic friction coefficient obtained under various pen pressures for the selected combination of writing instrument and writing medium. Therefore, even if the pen pressure applied to the electronic pen during writing changes, a writing feel equivalent to or similar to that of the selected combination of writing instrument and writing medium can be obtained.

[0048] Furthermore, in the pen input device sheet of this embodiment, the sheet is configured such that the frequency at which the amplitude of vibration of the dynamic friction coefficient has a peak in the vibration frequency characteristics of the dynamic friction coefficient of the pen input device sheet falls within the frequency range at which the amplitude of vibration of the dynamic friction coefficient has a peak in the vibration frequency characteristics of the dynamic friction coefficient obtained according to the difference in hardness of the tip portion, which is the contact part of the selected writing instrument with the writing medium, for the selected combination of writing instrument and writing medium. Therefore, regardless of the difference in hardness of the core body of the electronic pen, a writing feel equivalent to or similar to that of the selected combination of writing instrument and writing medium can be obtained.

[0049] [Description of the sheet 100 for the pen input device according to the first embodiment] The sheet 100 for the pen input device in this first embodiment is for the case where the combination of writing instrument and writing medium for which the user desires to obtain a writing feel using an electronic pen is a combination of a pencil and paper.

[0050] <Vibration frequency characteristics of the coefficient of dynamic friction in the target combination of writing instrument and writing medium> In this example, the pencil used as an example of a writing instrument is a Hi-Uni pencil manufactured by Mitsubishi Pencil Co., Ltd., and the example of a writing medium is copy paper.

[0051] Next, the coefficient of dynamic friction was measured by moving pencils with lead hardnesses of 4B, 2B, HB, and 2H on a single sheet of copy paper. In this case, three different pressures of 50gf, 100gf, and 200gf were applied to the pencils, and the measurements were taken by moving the pencils in a straight line at a speed of 10 mm / second on the copy paper. The pencils were moved at an angle of approximately 45 to 60 degrees relative to the surface of the copy paper. Then, the time-series change of the measured coefficient of dynamic friction was Fourier transformed to obtain the power spectrum of the change (vibration) of the coefficient of dynamic friction over time, i.e., the vibration frequency characteristics of the coefficient of dynamic friction.

[0052] The vibration frequency characteristics of the obtained kinetic friction coefficients are shown in Figures 4 to 7. Figure 4 shows the vibration frequency characteristics of the kinetic friction coefficient when writing with a pencil with a lead hardness of 4B, Figure 5 shows the characteristics when writing with a pencil with a lead hardness of 2B, Figure 6 shows the characteristics when writing with a pencil with a lead hardness of HB, and Figure 7 shows the characteristics when writing with a pencil with a lead hardness of 2H.

[0053] Figures 4(A), 5(A), 6(A), and 7(A) show the vibration frequency characteristics of the coefficient of dynamic friction when a pressure of 50gf is applied to the pencil; Figures 4(B), 5(B), 6(B), and 7(B) show the case when a pressure of 100gf is applied to the pencil; and Figures 4(C), 5(C), 6(C), and 7(C) show the case when a pressure of 200gf is applied to the pencil.

[0054] Referring to Figures 4(A), 5(A), 6(A), and 7(A), it can be confirmed that when writing on copy paper with a pencil under a pressure of 50gf, the frequency at which the amplitude of vibration of the coefficient of dynamic friction peaks is 18Hz for a 4B pencil, 20Hz for a 2B pencil, 17Hz for an HB pencil, and 15Hz for a 2H pencil. It should be noted that the typical pressure a user applies when writing on a writing medium with a pencil is approximately 50gf.

[0055] Referring to Figures 4(B) and 5(B), there are frequencies above 60Hz that protrude from adjacent frequency ranges. However, the broad waveform of the frequency distribution of the vibration magnitude over several tens of Hz shows a tendency for the power spectrum distribution to have its maximum value at frequencies below 35Hz. In particular, when writing with a soft pencil lead, the tip of the lead tends to wear down during the writing process. In this case, the frictional vibration of writing is affected by the vibration caused by the breakage of the lead as it wears down, and the frequency of the measured frictional vibration is dispersed. Therefore, when writing on copy paper with a pencil with a writing pressure of 100gf, it can be confirmed that the peak of the vibration magnitude of the dynamic friction coefficient is observed at a frequency of 22Hz for a 4B pencil and 12Hz for a 2B pencil.

[0056] Furthermore, referring to Figures 4(C) and 5(C), it can be confirmed that when writing on copy paper with a pencil subjected to a writing pressure of 200 gf, the frequency at which the amplitude of vibration of the coefficient of dynamic friction exhibits a peak is 8 Hz for a 4B pencil and 10 Hz for a 2B pencil.

[0057] Referring to Figures 6(B) and 7(B), it can be confirmed that when writing on copy paper with a pencil under a pressure of 100gf, the frequency at which the amplitude of vibration of the coefficient of dynamic friction exhibits a peak is 19Hz for HB pencils and 17Hz for 2H pencils.

[0058] Furthermore, referring to Figures 6(C) and 7(C), it can be confirmed that when writing on copy paper with a pencil subjected to a writing pressure of 200 gf, the frequency at which the amplitude of vibration of the coefficient of dynamic friction exhibits a peak is 22 Hz for HB pencils and 21 Hz for 2H pencils.

[0059] Furthermore, referring to Figures 4(B), (C), 5(B), (C), 6(B), (C), and 7(B), (C), it was confirmed that as the writing pressure on the pencil increases, the vibration of the dynamic friction coefficient is suppressed in the vibration frequency characteristics of the dynamic friction coefficient, and this tendency diminishes as the hardness of the pencil lead increases.

[0060] From the above, it can be confirmed that in this embodiment, when writing on copy paper with a pencil with a lead harder than 2B and 4B, under a writing pressure in the range of 50gf to 200gf, the vibration frequency characteristics of the coefficient of dynamic friction exhibit a peak in the magnitude of vibration of the coefficient of dynamic friction within a frequency range of 17Hz ± 5Hz. Furthermore, even when the lead hardness is 2B or 4B, if the writing pressure is in a light range such as 50gf to 100gf, the peak in the magnitude of vibration of the coefficient of dynamic friction exhibits within a frequency range of 17Hz ± 5Hz. That is, in this embodiment, the aforementioned ±Δ is set to ±Δ = ±5Hz.

[0061] In this frequency range, when the writing pressure exceeds 100gf, the characteristics of lead hardnesses 2B and 4B are not covered. However, by considering the hardness of the lead of the electronic pen 1, even within this frequency range, the pen input device sheet of this embodiment can provide a writing feel similar to that of a pencil and copy paper. Furthermore, even without considering the hardness of the lead of the electronic pen 1, if we consider that the writing pressure when writing on the pen input device sheet 100 with the electronic pen 1 is usually around 50gf, then even within this frequency range, the pen input device sheet of this embodiment can provide a writing feel similar to that of a pencil and copy paper.

[0062] Based on the measurement results described above, in this first embodiment, the pen input device sheet 100 is configured such that the vibration frequency characteristics of the coefficient of dynamic friction when writing on the pen input device sheet 100 with the electronic pen 1 are matched to the vibration frequency characteristics of the coefficient of dynamic friction when writing on copy paper with a pencil as described above.

[0063] In this first embodiment, when the electronic pen 1 is moved on the writing input surface of the pen input device sheet 100 at a predetermined speed of 10 mm / second with a predetermined pressure, for example 50 gf, the vibration frequency characteristics of the dynamic friction coefficient of the pen input device sheet 100 are configured to match the vibration frequency characteristics of the dynamic friction coefficient when a pencil is moved on copy paper under the same conditions (see Figures 4(A), 5(A), 6(A), and 7(A)), by having a peak in the magnitude of the vibration of the dynamic friction coefficient in a predetermined frequency range, in this example, a frequency range of 17 Hz ± 5 Hz. Note that the 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, but may be less or greater than 50 gf.

[0064] A specific example of the configuration of the pen input device sheet 100 according to the first embodiment for achieving this configuration is described below.

[0065] [Example configuration of the pen input device sheet 100 according to the first embodiment] Figures 8 and 9 are conceptual diagrams illustrating an example configuration of the pen input device sheet 100 according to the first embodiment. Figure 9 is a view of the pen input device sheet 100 according to the first embodiment, in the thickness direction, from the side where the electronic pen 1 is used for writing input. Figure 8 is a cross-sectional view taken along line AA in Figure 9.

[0066] As shown in Figure 8, the pen input device sheet 100 of this first embodiment consists of a base material 101 and an elastic material layer 102 disposed on the base material 101. In the case of a terminal having a display device 202, a transparent optical material is used as the elastic material 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, PET (Polyethylene terephthalate) resin. In this example, the base material 101 is a sheet-like member that covers the entire position detection area of ​​the position detection sensor 310 of the position detection device 300 when the pen input device sheet 100 is placed on 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, which in this example is polyurethane resin, and has multiple layers with different configurations (structures) in the thickness direction. In this example, the multiple layers of the elastic material layer 102 are made up of a first layer 1021 and a second layer 1022. In this example, the first layer 1021 is on the substrate 101 side (position detection sensor 310 side), and the second layer 1022 is on the side opposite to the substrate 101 side, which is the writing input surface for the electronic pen 1.

[0069] As shown in Figure 8, the first layer portion 1021 of the elastic material layer 102 is a uniform polyurethane resin layer. The second layer portion 1022 of the elastic material layer 102 is a layer having a first uneven pattern PT1 and a second uneven pattern PT2, as shown in Figures 8 and 9.

[0070] In this case, as shown in Figures 8 and 9, the first uneven pattern PT1 is formed such that the convex portions P1 and concave portions C1 are alternately repeated in the lateral and vertical directions of the surface of the pen input device sheet 100, along a direction perpendicular to the thickness direction of the layer (the direction of the surface parallel to the sheet surface). In Figure 9, hatching is applied to the bottom surface of the concave portions C1 to distinguish them from the convex portions P1 and concave portions C1 of the first uneven pattern PT1.

[0071] This first uneven pattern PT1 constitutes the main factor in selecting the writing feel of the pen input device sheet 100 in this embodiment. In this embodiment, the lengths of the convex portions P1 and concave portions C1 are selected such that they exhibit a writing feel when a target writing instrument (a pencil in this embodiment) is moved across the writing medium (copy paper in this embodiment). The lengths of the convex portions P1 and concave portions C1 correspond to the surface roughness parameter RSm (average length of roughness curve elements), which is d1, the average length of the contour curve elements (average spacing of unevenness) in a reference length. The combined height of the convex portions P1 and P2b corresponds to the surface roughness parameter Rz (maximum height; height from the lowest valley bottom to the highest peak for each reference length), which is HT, the maximum height in the contour curve (maximum height of unevenness) in a reference length.

[0072] In the pen input device sheet 100 of this first embodiment, the vibration frequency characteristics of the dynamic friction coefficient are matched to the frequency at which the vibration frequency characteristics of the dynamic friction coefficient exhibit a peak when a pencil is moved on copy paper (see Figures 4(A), 5(A), 6(A), and 7(A)), and the average spacing d1 of the protrusions P1 and recesses C1 of the first uneven pattern PT1 is selected so that the maximum value of the peak waveform of the vibration of the dynamic friction coefficient is exhibited in the frequency range of 17Hz ± 5Hz. In addition, the maximum height HT of the unevenness is selected so that the surface roughness is such that a rough feeling is obtained when a pencil, as an example of a writing instrument, is moved on the paper.

[0073] In the foregoing, "matching the frequency at which the peak occurs" may mean that the frequency at which the peak occurs is within a predetermined frequency range, or it may mean that the frequency at which the peak occurs is a frequency that matches or approximates a predetermined frequency.

[0074] In this embodiment, the average spacing d1 of the bumps in the first bump pattern PT1 is defined as the average length of the contour curve elements in the reference length of the pen input device sheet 100, for example, d1 = 0.5 mm to 0.6 mm. The height HT, which is the sum of the protrusions P1 of the first bump pattern PT1 and the protrusions P2a of the second bump pattern PT2, is selected as the maximum height in the contour curve in the reference length of the pen input device sheet 100, and is set in the range of HT = 9 μm to 20 μm, preferably H1 = approximately 12.4 μm.

[0075] Furthermore, as shown in Figures 8 and 9, the second uneven pattern PT2 is formed in the same way as the first uneven pattern PT1, with convex and concave portions repeating along a direction perpendicular to the thickness direction of the layer (the direction of the surface parallel to the sheet surface), and in the lateral and longitudinal directions of the surface of the pen input device sheet 100. In this embodiment, the second uneven pattern PT2 is formed so as to superimpose on the first uneven pattern PT1. The second uneven pattern PT2 is a pattern that forms uneven shapes that are repeated at specific regular intervals or that are irregularly arranged. In this example, the second uneven pattern PT2 is configured to repeat at specific regular intervals.

[0076] In other words, in this embodiment, as shown in Figures 8 and 9, the second uneven pattern PT2 is configured such that unevenness is formed on both the upper surface of the convex portion P1 and the bottom surface of the concave portion C1 of the first uneven pattern PT1. In the example shown in Figures 8 and 9, in the center of the upper surface of the convex portion P1 of the first uneven pattern PT1, there is an area smaller than the convex portion P1 (height H2 is H2

[0077] Therefore, in this embodiment, assuming a plane where the first uneven pattern PT1 does not exist, the second uneven pattern PT2 is formed by having protrusions P2a and P2b that are smaller (including height) than the protrusions P1 of the first uneven pattern PT1, with a repeating pitch of 1 / 2 of the average spacing d1 of the protrusions of the first uneven pattern PT1.

[0078] ​In other words, the second uneven surface pattern PT2 is formed with an average spacing of uneven surfaces that is smaller than the average spacing d1 of the uneven surfaces of the first uneven surface pattern PT1, and with uneven surfaces that are smaller in size than the uneven surfaces of the first uneven surface pattern PT1.

[0079] This second uneven pattern PT2 works to disperse the sharp peak waveform of the vibration frequency characteristics of the dynamic friction coefficient of the pen input device sheet 100, which is generated by the unevenness of the first uneven pattern PT1 described above, and to form a broadened peak waveform of the vibration frequency distribution.

[0080] Furthermore, when the pen input device sheet 100 is placed on the display screen 202D, this second uneven pattern PT2 has a deterrent effect that suppresses the reduction in visibility of the displayed image caused by the reflection of ambient light or the reflection of images on the surface of the pen input device sheet 100, and thus also plays a role in improving the visibility of the displayed image.

[0081] The method for forming the first uneven pattern PT1 and the second uneven 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, the transfer film member 400 is formed on a sheet-like base film 401 by UV (ultraviolet) curing ink, with the corresponding uneven patterns PT1 and PT2 of the second layer portion 1022 formed thereon, and the transfer uneven portion 402 (hard member) is UV printed by UV curing. The unevenness relationship of the transfer uneven portion 402 is reversed compared to the first uneven pattern PT1 and PT2 of the second layer portion 1022. Furthermore, in this transfer film member 400, a release agent is applied to the surface of the uneven pattern of the transfer uneven portion 402. Furthermore, the method for forming the transfer-type uneven surface 402 is not limited to additive manufacturing such as UV printing. The desired shape of the uneven surface may also be formed by applying an uneven coating to the surface of the base film, kneading an uneven surface forming material into the base film, or by pressing the base film with a mold, or by using a combination of these methods.

[0083] Then, the transfer film member 400 is pressed against the side of the base film 401 on which the transfer uneven portion 402 is formed, on the side of the elastic material layer 102 opposite to the base material 101, so that it can be peeled off after the elastic material has hardened. As a result, the second layer portion 1022 having the first uneven pattern PT1 and the second uneven pattern PT2 as described above is formed on the side of the elastic material layer 102 opposite to the base material 101.

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

[0085] According to the first embodiment of the pen input device sheet 100, it is possible to obtain a pen input device sheet having a vibration frequency characteristic of a dynamic friction coefficient that approximates the vibration frequency characteristic of the dynamic friction coefficient in a target combination of writing instrument and writing medium.

[0086] For example, when the writing instrument has lead hardnesses of 4B, 2B, and HB, and the writing medium is copy paper, as shown in Figures 4(A)-(C), 5(A)-(C), and 6(A)-(C), the maximum value of the peak waveform in the vibration frequency characteristics of the dynamic friction coefficient does not spike out from the surrounding frequency ranges, but rather tends to be the peak portion of a broad waveform spanning several tens of Hz in a vibration frequency range with a width of about 20 Hz that includes the maximum value of the peak waveform, representing the frequency distribution of the magnitude of the vibration.

[0087] Therefore, in this first embodiment, if the desired writing feel is to be obtained when writing on copy paper with pencils of lead hardness 4B, 2B, and HB, the first uneven pattern PT1 of the second layer portion 1022 of the elastic material layer 102 is configured such that the frequency at which the peak waveform of the vibration of the dynamic friction coefficient exhibits its maximum value in the vibration frequency characteristics of the dynamic friction coefficient when writing with the electronic pen 1 on the pen input device sheet 100 of the first embodiment is in the frequency range of 17Hz ± 5Hz, as described above. The second uneven pattern PT2 of the second layer portion 1022 of the elastic material layer 102 is configured to have an average spacing of unevenness that is smaller than the average spacing of unevenness in the first uneven pattern PT1, and to have unevenness that is smaller than the unevenness of the first uneven pattern PT1.

[0088] In other words, the uneven pattern of the UV-curing ink used to form the transfer uneven portion 402 on the base film 401 of the transfer film member 400 corresponds to the first uneven pattern PT1 and the second uneven pattern PT2 of the elastic material layer 102 described above. In this case, the presence of the second uneven pattern PT2 causes the predetermined vibration frequency caused by the first uneven pattern PT1 to be dispersed back and forth.

[0089] Furthermore, by selecting the line width of the UV-curing ink and the pitch of the uneven pattern for the transfer uneven portion 402 formed on the base film 401 of the transfer film member 400, such 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 lies within the frequency range of 80 Hz ± 5 Hz, the vibration frequency characteristics of the dynamic friction coefficient for cores with hardnesses of 4B, 2B, and HB can be reproduced.

[0090] Furthermore, in the case of a pencil with a lead hardness of 2H, as shown in Figures 7(A) to (C), the frequency at which the second largest peak in the vibration of the coefficient of dynamic friction is observed lies in the frequency range of 100 ± ΔHz (where Δ is, for example, 10).

[0091] Therefore, if you want to obtain the writing feel of writing on paper with a pencil with a lead hardness of 2H, the first uneven pattern PT1 is configured in the same way as described above, but the formation pitch of the second uneven pattern PT2 is selected so 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 is observed is in the frequency range of 100Hz ± 10Hz, thereby configuring the sheet 100 for the pen input device of this first embodiment.

[0092] As described above, with the pen input device sheet 100 of the first embodiment described above, when writing with an electronic pen on the pen input device sheet 100, the same sensation (writing feel or writing sensation) as when writing with a pencil on copy paper can be obtained, and the roughness of writing that occurs when writing with a pencil on paper can also be obtained.

[0093] Furthermore, according to the first embodiment of the pen input device sheet 100, the elastic material layer 102 is configured to have a first uneven pattern PT1 and a second uneven pattern PT2, so that it can adapt not only to the maximum value of the peak waveform of the vibration of the dynamic friction coefficient in the case of the target writing instrument and writing medium, but also to a broad waveform of the frequency distribution of the magnitude of vibration, which includes vibration frequencies before and after the maximum value of the peak waveform. As a result, according to the first embodiment of the pen input device sheet 100, it is relatively easy to make the writing feel closer to the writing feel of the target writing instrument and writing medium combination.

[0094] Furthermore, according to the first embodiment of the pen input device sheet 100, the presence of the second uneven pattern PT2 provides a fender effect that suppresses the occurrence of reflection of external light and image reflection on the pen input device sheet 100, which is so-called mirror-like, thereby improving the visibility of the displayed image.

[0095] In the first embodiment of the pen input device sheet 100 described above, the first uneven pattern PT1 and the second uneven pattern PT2 are configured to repeat along directions parallel to the horizontal and vertical directions of the surface of the pen input device sheet 100. However, the first uneven pattern PT1 and the second uneven pattern PT2 may be formed in directions that intersect the horizontal and vertical directions rather than being parallel to the horizontal and vertical directions of the surface of the pen input device sheet 100, and the patterns do not have to be regularly arranged in a certain direction as long as the predetermined average spacing of the unevenness is satisfied.

[0096] Furthermore, in the first embodiment of the pen input device sheet 100 described above, the elastic material layer 102 is made of urethane resin, but it goes without saying that it is not limited to urethane resin. Also, it goes without saying that the material of the transfer uneven portion 402 of the transfer film member 400 is not limited to UV-curing ink.

[0097] [Regarding the surface roughness of the pen input device sheet 100 in the first embodiment] In the first embodiment of the pen input device sheet 100, as described above, a second uneven pattern PT2 with small irregularities exists within a first uneven pattern PT1 with large irregularities, and these irregularities have a predetermined relationship, thereby providing a desired writing feel and achieving fendering.

[0098] To define the relationship between the surface roughness of the first surface roughness pattern PT1 and the second surface roughness pattern PT2, in this example, the surface roughness caused by each surface roughness is measured, and the relationship is determined by using the measurement results of both.

[0099] Here, by changing the measurement conditions, the surface roughness due to the irregularities of the first uneven pattern PT1 and the surface roughness due to the irregularities of the second uneven pattern PT2 are measured separately. In this case, several samples of the pen input device sheet 100 that have been confirmed to have good writing feel and fendering properties are prepared and their surface roughness is measured.

[0100] In this case, the transfer film member 400 is constructed by creating an uneven surface by sandwiching it between two rotating drums, and the finish of the uneven pattern is specified as a matte finish. Therefore, two types of transfer film members 400 with different matte finish manufacturing methods were used, and sample sheets MP1 and MP2 for pen input devices with a matte finish were prepared.

[0101] Furthermore, in this example, three types of sample MP2 were prepared: sample MP2 (standard) using a transfer film member 400 manufactured with a standard first uneven pattern PT1; sample MP2 (shallow) in which the depth of the unevenness of the first uneven pattern PT1 was intentionally made shallower; and sample MP2 (deep) in which the depth of the unevenness of the first uneven pattern PT1 was intentionally made deeper. In other words, the surface roughness of the pen input device sheet 100 described below was measured for the four types of samples MP1, MP2 (standard), MP2 (shallow), and MP2 (deep).

[0102] The measurement and evaluation conditions for surface roughness in this case are shown in Figures 10 and 11. In Figure 11, "λc" and "λs" are cutoff values, respectively. That is, when a surface is measured with a measuring instrument, a measurement cross-sectional curve is obtained in which various wavelengths of the surface shape are mixed. The cross-sectional curve obtained by removing unwanted short wavelength components such as noise is called the cross-sectional curve, and the cutoff value λs determines how short wavelengths to remove. Similarly, the curve obtained by removing the shapes of short wavelengths from the measurement cross-sectional curve is called the waviness curve, and the cutoff value λc determines how short wavelengths to remove. In this case, the relationship between the length of the cutoff wavelength is λc > λs. The curve obtained by removing the shapes of long wavelengths (waviness curve) from the cross-sectional curve is called the roughness curve, and while waviness ignores wavelengths shorter than the cutoff value λc, roughness ignores wavelengths longer than the cutoff value λc. These cutoff values ​​λc and λs are well known (see, for example, URL (https: / / d-monoweb.com / expert_column / surface-roughness-parameter / )).

[0103] Figure 12 shows the measurement results for four samples MP1, MP2 (standard), MP2 (shallow insertion), and MP2 (deep insertion) under the measurement and evaluation conditions shown in Figures 10 and 11. Here, Figure 12(A) is a table showing the measurement results for the first uneven pattern PT1 of the pen input device sheet 100, and Figure 12(B) is a table showing the measurement results for the second uneven pattern PT2 of the pen input device sheet 100.

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

[0105] The numerical values ​​to the right of each parameter Ra, Rp, Rv, Rz, and RSm indicate the cutoff value λc under the evaluation conditions. In other words, in Figures 12(A) and (B), parameters Ra8.0, Rp8.0, Rv8.0, Rz8.0, and RSm8.0 are the values ​​of parameters Ra, Rp, Rv, Rz, and Rsm when the cutoff value λc = 8.0 mm, and parameters Ra0.25, Rp0.25, Rv0.25, Rz0.25, and RSm0.25 are the values ​​of parameters Ra, Rp, Rv, Rz, and Rsm when the cutoff value λc = 0.25 mm.

[0106] Based on the measurement results shown in Figures 12(A) and (B), it can be defined that the first uneven pattern PT1 and the second uneven pattern PT2 in the pen input device sheet 100 of the embodiment are in an appropriate relationship as follows.

[0107] In this example, the relationship between the first uneven pattern PT1 and the second uneven pattern PT2 in the pen input device sheet 100 of the embodiment is determined by finding the ratio of each of the parameters Ra8.0, Rp8.0, Rv8.0, Rz8.0, and RSm8.0 measured at a cutoff value λc=8.0mm to each of the parameters Ra0.25, Rp0.25, Rv0.25, Rz0.25, and RSm0.25 measured at a cutoff value λc=0.25mm.

[0108] Figure 13 shows a table of the ratios of each parameter, i.e., Ra8.0 / Ra0.25, Rp8.0 / Rp0.25, Rv8.0 / Rv0.25, Rz8.0 / Rz0.25, and RSm8.0 / RSm0.25, for four types of samples MP1, MP2 (standard), MP2 (shallow insertion), and MP2 (deep insertion), obtained from Figures 12(A) and (B). Figure 13 also shows the mean values ​​of the parameter RSm8.0 measured for each of the four types of samples MP1, MP2 (standard), MP2 (shallow insertion), and MP2 (deep insertion).

[0109] From Figure 13, it can be defined that the first uneven pattern PT1 and the second uneven pattern PT2 in the pen input device sheet 100 of the embodiment are in an appropriate relationship as follows.

[0110] In other words, the parameter RSm8.0 measured at a cutoff value λc = 8.0 mm is in the range of 0.513 to 0.816, and the ratio of the parameter Ra8.0 measured at a cutoff value λc = 8.0 mm to the parameter Ra0.25 measured at a cutoff value λc = 0.25 mm, i.e., Ra8.0 / Ra0.25, being in the range of 1.908 to 3.349, can be considered one condition indicating a proper relationship.

[0111] Furthermore, the fact that the parameter RSm8.0 measured at a cutoff value of λc=8.0mm is in the range of 0.513 to 0.816, and that the ratio of the parameter Rv8.0 measured at a cutoff value of λc=8.0mm to the parameter Rv0.25 measured at a cutoff value of λc=0.25mm, i.e., Rv8.0 / Rv0.25, is in the range of 1.769 to 3.997, can be considered one condition indicating a proper relationship.

[0112] [Modified example of the pen input device sheet 100 of the first embodiment] In the first embodiment of the pen input device sheet 100 described above, an elastic material layer 102 is formed on the base material 101 in order to make it removable on the display screen 202D. However, if removal is not considered, the base material 101 may be changed to an adhesive layer, and the pen input device sheet 100 may be attached to the surface of the display screen 202D or the like using this adhesive layer. Alternatively, an adhesive layer may be provided on the side of the base material 101 opposite to the side where the elastic material layer 102 is formed, and the pen input device sheet 100 may be attached to the surface of the display screen 202D or the like using this adhesive layer.

[0113] Below, with reference to the figures, other examples of specific configurations (structural examples) of the pen input device sheet of the first embodiment will be described as modifications.

[0114] <First variation> Figure 14 is a conceptual diagram illustrating a specific configuration example (structural example) of the first modified example of the pen input device sheet 100A. In the example of the pen input device sheet 100A in Figure 14, the same reference numerals are used for components identical to those of the pen input device sheet 100 of the first embodiment described above, and their detailed explanation is omitted.

[0115] This first modified example of the pen input device sheet 100A has a configuration in which the base material 101 is removed from the pen input device sheet 100 of the first embodiment. That is, in this first modified example of the pen input device sheet 100A, the elastic material layer 102 alone constitutes the pen input device sheet 100A.

[0116] Even with the configuration described above, when writing with an electronic pen on the pen input device sheet 100A of this first modified example, by holding the pen input device sheet 100A in place with your hand or tape, just like with paper, you can obtain the same feel (writing sensation or writing feel) as the pen input device sheet 100 of the first embodiment described above.

[0117] <Second variation> Figure 15 is a conceptual diagram illustrating a specific configuration example (structural example) of the second modified example of the pen input device sheet 100B. In the example of the pen input device sheet 100B in Figure 15, the same reference numerals are used for the same components as those in the first embodiment of the pen input device sheet 100 described above, and their detailed explanation is omitted.

[0118] This second modified example of the pen input device sheet 100B is an example in which the base material 101 of the pen input device sheet 100 of the first embodiment is changed to an adhesive layer 103. That is, as shown in Figure 15, this second modified example of the pen input device sheet 100B is constructed by providing an elastic material layer 102 and an adhesive layer 103 on the side of the elastic material layer 102 facing the position detection device 300. This pen input device sheet 100B is then attached to the upper surface of the glass top plate 500 of the display screen 202D of the tablet-type information terminal 200 by the adhesive layer 103.

[0119] Even in the second modified configuration described above, when writing with an electronic pen on the pen input device sheet 100B, since the pen input device sheet 100B is attached to the upper surface of the glass top plate 500, the same feel (writing feel or writing sensation) as the pen input device sheet 100 of the first embodiment described above can be obtained without having to hold down the pen input device sheet 100B with your hand or tape.

[0120] <Third variation> Figure 16 is a conceptual diagram illustrating a specific configuration example (structural example) of the pen input device sheet 100C of this third modified example. In the pen input device sheet 100C of the example in Figure 16, the same reference numerals are used for components that are the same as those of the pen input device sheet 100 of the first embodiment described above, and their detailed explanation is omitted.

[0121] This third modified example of the pen input device sheet 100C is an example in which an adhesive layer 103C is added to the side of the base material 101 opposite to the elastic material layer 102 side of the pen input device sheet 100 of the first embodiment described above.

[0122] In this third modified example, the pen input device sheet 100C is configured such that, as shown in Figure 16, an adhesive layer 103C is provided on the side of the base material 101 opposite to the elastic material layer 102 side (the side facing the position detection device 300). This pen input device sheet 100C is then attached to the upper surface of the glass top plate 500 of the display screen 202D of the tablet-type information terminal 200 using the adhesive layer 103.

[0123] When writing with an electronic pen on the third modified pen input device sheet 100C having the configuration described above, the same feel (writing sensation or writing feel) as the pen input device sheet 100 of the first embodiment described above can be obtained.

[0124] In the first embodiment of the pen input device sheet 100 described above, the second uneven pattern PT2 was described as being formed in the second layer portion 1022 so as to overlap the first uneven pattern PT1. However, if the second uneven pattern PT2 is considered separately as an uneven pattern consisting of a convex portion P2a formed on the convex portion P1 of the first uneven pattern PT1 and the surrounding concave portion, and an uneven pattern consisting of a convex portion P2b formed on the concave portion C1 of the first uneven pattern PT1 and the surrounding concave portion, then the uneven pattern consisting of the convex portion P2a formed on the convex portion P1 of the first uneven pattern PT1 and the surrounding concave portion can be considered as a different layer portion from the second layer portion 1022. In that case, the elastic material layer 102 can have three layer portions.

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

[0126] Figures 17 and 18 are conceptual diagrams illustrating an example configuration of the pen input device sheet 100D of this second embodiment. In Figure 17, the pen input device sheet 100D is shown in a cross-sectional view, similar to Figure 8. The pen input device sheet 100D of this second embodiment is fixed to a smooth glass top plate 500, which serves as a support representing a pen tablet terminal housing or display device, with a sheet-like adhesive layer 103. Note that the position detection device 300 is omitted in Figure 17.

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

[0128] The elastic material layer 102D is made of an elastic material, and in this example, a PVC (polyvinyl chloride) sheet with a thickness of 0.1 mm is used. In this second embodiment, the elastic material layer 102D has multiple layers with different configurations (structures) in the thickness direction, in this example, a first layer portion 1021D on the side of the adhesive layer 103D, a second layer portion 1022D formed on the first layer portion 1021D on the opposite side from the adhesive layer 103D, and a third layer portion 1023 formed on the second layer portion 1022D.

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

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

[0131] Furthermore, the first layer portion 1021D of the elastic material layer 102D has a configuration in which recesses CD1 and protrusions PD1 alternately repeat along a direction perpendicular to the thickness direction of the elastic material layer 102D (the direction of the surface parallel to the sheet surface of the first layer portion 1021D). This first uneven pattern PTD1, like the first uneven pattern PT1 of the pen input device sheet 100 of the first embodiment, constitutes the main factor in selecting the writing feel of the pen input device sheet 100D of this second embodiment.

[0132] In this example, the protrusions PD1 of the first uneven pattern PTD1 of the first layer portion 1021D are composed of a hard member 1021Da made of a harder material than the second layer portion 1022D. In this example, this hard member 1021Da is made of a UV (Ultra Violet) curing material. In this example, the hard member 1021Da is formed as a grid pattern as shown in Figure 18. The recesses CD1 of the first uneven pattern PTD1 of the first layer portion 1021D are, in this example, spaces 1021Db that are not filled with material (i.e., spaces made of air). In this case, the tips of the protrusions PD1 that constitute the first uneven pattern PTD1 of the first layer portion 1021D on the adhesive layer 103D side are in contact with one surface of the adhesive layer 103D. Thus, the first layer portion 1021D is a first uneven pattern PTD1 in which the recess CD1 has an air space 1021Db, and is therefore a layer that is elastic in the thickness direction.

[0133] As can be seen from the above configuration, in this example, the first layer portion 1021D and the second layer portion 1022D have different densities and hardness per unit volume from each other. In Figure 18, the hard member 1021Da is shown with a thick black line to make it clearer, but this hard member 1021Da may also be made of a transparent material.

[0134] The third layer portion 1023D of the elastic material layer 102D is a layer portion of the second uneven pattern PTD2 formed on the second layer portion 1022D. The convex portion PD2 of this second uneven pattern PT2 is integral with the second layer portion 1022D and is made of PVC, while the concave portion CD2 is an unfilled space. In other words, the third layer portion 1023D is exposed on the exposed surface 102DS of the elastic material layer 102D opposite to the adhesive layer 103D side.

[0135] In this second embodiment as well, the second uneven pattern PTD2 of the third layer portion 1023D of the elastic material layer 102D is configured to have an average spacing of unevenness that is smaller than the average spacing of unevenness in the first uneven pattern PTD1, and to have unevenness that is smaller than the unevenness of the first uneven pattern PTD1.

[0136] The second uneven pattern PTD2 of this third layer portion 1023D, similar to the second uneven pattern PT2 of the pen input device sheet 100 in the first embodiment described above, works to disperse the sharp peak waveform of the vibration frequency characteristics of the dynamic friction coefficient of the pen input device sheet 100D generated by the unevenness of the first uneven pattern PTD1, thereby forming a broadened peak waveform of the vibration frequency distribution. It also plays a role in providing fendering and improving the visibility of the displayed image in the pen input device sheet 100D.

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

[0138] On the side of the elastic material layer 102D where the adhesive layer 103D of the second layer portion 1022D, which is a PVC sheet, is provided, a grid pattern corresponding to the grid pattern of the first uneven pattern PTD1 is UV printed using UV-curing ink (UV-curing type ink), as shown in Figure 18, and the grid pattern of the rigid member 1021Da is formed by UV curing. In this example, the grid pattern formed on the rigid member 1021Da is formed with lines made of UV-curing ink that form the grid, tilted 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 UV-curable ink does not exist on the hard member 1021Da UV printed on the second layer portion 1022D becomes the recess CD1 of the first uneven 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 UV-curable ink exists becomes the convex portion PD1 of the first uneven pattern PTD1 of the first layer portion 1021D of the elastic material layer 102D.

[0140] In the second embodiment, the second uneven pattern PTD2 on the exposed surface 102DS side of the second layer portion 1022D of the elastic material layer 102D of the pen input device sheet 100D is formed, for example, by using a transfer film member, similar to the first embodiment. In this case, the transfer film member has an uneven pattern corresponding to the second uneven pattern PTD2 formed of a material harder than the material of the second layer portion 1022D of the elastic material layer 102D, and the second uneven pattern PTD2 is formed when the transfer film member is pressed against the second layer portion 1022D while it is softened by heat or the like. The formation of this second uneven pattern PTD2 may occur either before or after the formation of the first layer portion of the first uneven pattern PTD1.

[0141] In this case, the second uneven pattern PTD2 is formed with an average spacing of unevenness smaller than the average spacing d1 of the unevenness of the first uneven pattern PTD1, and is also formed with unevenness smaller than the size of the unevenness of the first uneven pattern PT1, as in the first embodiment.

[0142] Furthermore, as in the first embodiment, this second uneven pattern PTD2 works to disperse the sharp peak waveform of the vibration frequency characteristics of the dynamic friction coefficient of the pen input device sheet 100D generated by the unevenness of the first uneven pattern PTD1, thereby forming a broadened peak waveform of the vibration frequency distribution. It also has a fendering effect and plays a role in improving the visibility of the displayed image.

[0143] Then, the pen input device sheet 100D of the second embodiment is formed 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 pen input device sheet 100D that is opposite to the second layer portion 1022D side.

[0144] In this second embodiment of the pen input device sheet 100D, the vibration frequency characteristics of the dynamic friction coefficient are matched to the vibration frequency characteristics of the dynamic friction coefficient when a pencil is moved on copy paper (see Figures 4(A), 5(A), 6(A), and 7(A)), and in order to exhibit the maximum value of the peak waveform of the vibration of the dynamic friction coefficient in the frequency range of 17Hz ± 5Hz, the line width w of the UV-curable ink for the grid pattern for forming the first uneven pattern PTD1 (see Figure 18) and the grid formation pitch Pt of the grid pattern (see Figure 18) 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 grid formation pitch Pt of the grid pattern is set to Pt = 0.4 mm to 0.5 mm, and a grid pattern is formed using the UV-curable ink.

[0146] In this second embodiment, when writing force is applied with an electronic pen 1 at a speed of 10 mm / second on the exposed surface 102DS side of the second layer portion 1022D of the pen input device sheet 100D, it was confirmed that, similar to the cases in Figures 4(A) to 7(A), the maximum value of the peak waveform of the vibration of the dynamic friction coefficient is obtained within the frequency range of 17 Hz ± 5 Hz in the vibration frequency characteristics of the dynamic friction coefficient.

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

[0148] In the pen input device sheet 100D of the second embodiment described above, when writing pressure is applied with the electronic pen 1 on the pen input device sheet 100D, the same sensation (writing feel or writing sensation) as when writing pressure is applied with a pencil on copy paper can be obtained, and the roughness of writing that occurs in the relationship between a pencil and paper can also be obtained, as well as providing a fender effect and improving the visibility of the displayed image.

[0149] In addition, the pen input device sheet 100D of this second embodiment can also be modified in the same way as the modifications of the pen input device sheet 100 of the first embodiment described above, such as changing the adhesive layer 103D to a base material.

[0150] [Example configuration of the pen input device sheet 100E according to the third embodiment] Figure 19 is a conceptual diagram illustrating a specific configuration example (structural example) of the pen input device sheet 100E of the third embodiment. In Figure 19, the pen input device sheet 100E is shown in a cross-sectional view, similar to Figures 8 and 17. This third embodiment of the pen input device sheet 100E corresponds to a configuration example in which the elastic material is changed from the pen input device sheet 100D of the second embodiment to polyurethane resin, the recesses CD1 of the first uneven pattern PTD1 of the first layer portion 1021D are filled with the elastic material, and a base material 101E is provided instead of the adhesive layer 103D. In this example, the base material 101E is made of PET resin.

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

[0152] In this third embodiment of the pen input device sheet 100E, an example of different configurations (structures) for the first layer portion 1021E, the second layer portion 1022E, and the third layer portion 1023E is that they have different densities per unit volume and / or different hardness per unit volume.

[0153] In the third embodiment of the pen input device sheet 100E shown in Figure 19, the second layer portion 1022E of the elastic material layer 102E is made of a uniform polyurethane resin only. The first layer portion 1021E has a configuration in which a first uneven pattern PTE1 is formed in which recesses CE1 and protrusions PE1 are alternately repeated along a direction perpendicular to the thickness direction of the layer (the direction of the surface parallel to the exposed surface 102ES of the pen input device sheet 100E).

[0154] In this third embodiment, the first uneven pattern PTE1 of the first layer portion 1021E of the elastic material layer 102E in the pen input device sheet 100E is a grid-like pattern made of UV-curable material, formed on the substrate 101E in the same manner as the first uneven pattern PTD1 of the first layer portion of the pen input device sheet 100D in the second embodiment (see Figure 18). In this case, the recesses CE1 of the first uneven pattern PTE1 of the first layer portion 1021E are filled with the same polyurethane resin as the second layer portion 1022E.

[0155] In other words, the protrusions PE1 of the first uneven pattern PTE1 are made of a rigid member 1021Ea made of UV-curing material, and the recesses CE1 are filled with an elastic material that is sufficiently softer than the UV-curing material, in this example, polyurethane resin. The difference between this third embodiment and the second embodiment is that the recesses CE1 of the first uneven pattern PTE1 of the first layer portion 1021E are not air spaces, but are filled with polyurethane that is softer than the rigid member 1021Ea made of UV-curing material. Thus, the first layer portion 1021E is a first uneven pattern PTE1 in which the recesses CE1 are filled with an elastic material, and therefore it is a layer that has elasticity in the thickness direction.

[0156] The third layer portion 1023E of the elastic material layer 102E is a layer portion of the second uneven pattern PTE2 formed on the second layer portion 1022E. In this example, the convex portion PE2 of the second uneven pattern PTE2 is integrated with the second layer portion 1022E and is made of polyurethane resin. The concave portion CE2 of the second uneven pattern PTE2 is an unfilled space. The third layer portion 1023E is exposed on the exposed surface 102ES of the elastic material layer 102E, opposite to the substrate 101E side.

[0157] In this third embodiment as well, the second uneven pattern PTE2 of the third layer portion 1023E of the elastic material layer 102E is configured such that the average spacing of the unevenness is smaller than the average spacing of the unevenness of the first uneven pattern PTE1, and the unevenness is smaller than that of the first uneven pattern PTE1.

[0158] In this third embodiment, the second uneven pattern PTE2 of the third layer portion 1023E of the elastic material layer 102E of the pen input device sheet 100E is formed by using a transfer film member, similar to the first embodiment. In this case, the transfer film member has an uneven pattern corresponding to the second uneven pattern PTE2 formed on it using a hardened resin material that is harder than polyurethane resin, and the second uneven pattern PTE2 is formed when the transfer film member is pressed against the writing input surface side of the elastic material layer 102E.

[0159] The second uneven pattern PTE2 of this third layer portion 1023E, similar to the second uneven pattern PT2 of the pen input device sheet 100 in the first embodiment described above, works to disperse the sharp peak waveform of the vibration frequency characteristics of the dynamic friction coefficient of the pen input device sheet 100E generated by the unevenness of the first uneven pattern PTE1, thereby forming a broadened peak waveform of the vibration frequency distribution. It also plays a role in providing fendering and improving the visibility of the displayed image in the pen input device sheet 100E.

[0160] In the third embodiment of the pen input device sheet 100E described above, when writing pressure is applied with the electronic pen 1 on the pen input device sheet 100E, the same sensation (writing feel or writing sensation) as when writing pressure is applied with a pencil on copy paper can be obtained, and the roughness of writing that occurs when writing with a pencil on paper can also be obtained, as well as providing a fender effect and improving the visibility of the displayed image.

[0161] In addition, the pen input device sheet 100E of this third embodiment can also be modified in the same way as the modification of the pen input device sheet 100 of the first embodiment described above, such as changing the base material 101E to an adhesive layer.

[0162] [Example configuration of the pen input device sheet 100F according to the fourth embodiment] Figure 20 is a conceptual diagram illustrating a specific configuration example (structural example) of the pen input device sheet 100F according to the fourth embodiment. In Figure 20, the pen input device sheet 100F is shown in a cross-sectional view, similar to Figures 8, 17, and 19.

[0163] In this fourth embodiment of the pen input device sheet 100F, similar to the pen input device sheet 100E of the third embodiment, the second layer portion 1022F of the elastic material layer 102F is made of a uniform polyurethane resin only. However, in this fourth embodiment of the pen input device sheet 100F, the exposed surface 102FS side of the second layer portion 1022F does not have a layer portion corresponding to the third layer portion 1023E consisting of the second uneven pattern PTE2 of the pen input device sheet 100E of the third embodiment. Instead, in this fourth embodiment of the pen input device sheet 100F, the second uneven pattern PTF2 is provided by forming convex portions PF2a and PF2b on the upper surface of the convex portion PF1 and the bottom surface of the concave portion CF1 of the first uneven pattern PTF1 that constitutes the first layer portion 1021F. In other words, in the pen input device sheet 100F of this fourth embodiment, the second uneven pattern PTF2 is formed so as to overlap the first uneven pattern PTF1.

[0164] In this fourth embodiment, the first layer portion 1021F forms a grid pattern made of UV-curable material on the substrate 101F, similar to the sheet 100E for the pen input device in the third embodiment, thereby forming the first uneven pattern PTF1. In this fourth embodiment, the convex portion PF2a of the second uneven pattern PTF2 is formed on the lines made of UV-curable material constituting the first uneven pattern PTF1, that is, on the upper surface of the convex portion PF1, and the convex portion PF2b of the second uneven pattern PTF2 is formed on the bottom surface of the recessed portion CF1, where there is no UV-curable material. As shown in Figure 20, the recessed portion CF1 of the first uneven pattern PTF1 is filled with polyurethane resin, which is integrated with the second layer portion 1022F, similar to the third embodiment.

[0165] As also explained in the first embodiment of the pen input device sheet 100, if the second uneven pattern PTF2 is considered separately as an uneven pattern consisting of a convex portion PF2a formed on the convex portion PF1 of the first uneven pattern PTF1 and the surrounding concave portion, and an uneven pattern consisting of a convex portion PF2b formed on the concave portion CF1 of the first uneven pattern PTF1 and the surrounding concave portion, then the uneven pattern consisting of the convex portion PF2a formed on the convex portion PF1 of the first uneven pattern PTF1 and the surrounding concave portion can be considered as a different layer portion from the first layer portion 1021F. In that case, the elastic material layer 102F can have three layer portions.

[0166] The second uneven pattern PTE2 of the pen input device sheet 100F in this fourth embodiment, like the second uneven patterns PT2 to PTE2 of the pen input device sheets 100 to 100E in the first to third embodiments described above, works to disperse the sharp peak waveform of the vibration frequency characteristics of the dynamic friction coefficient of the pen input device sheet 100F generated by the unevenness of the first uneven pattern PTF1, and to form a broadened peak waveform of the vibration frequency distribution. However, in the case of this fourth embodiment, there is no fendering effect from the second uneven pattern PTF2.

[0167] In addition, the pen input device sheet 100F of this fourth embodiment can also be modified in the same way as the modified version of the pen input device sheet 100 of the first embodiment described above, such as by changing the base material 101F to an adhesive layer.

[0168] [Other embodiments or modifications] In the above-described embodiment of the pen input device sheet, the target combination of writing instrument and writing medium for which the user desired to obtain a writing feel using an electronic pen was a pencil and copy paper. However, the target combination of writing instrument and writing medium is not limited to this, and various combinations are possible, such as a ballpoint pen and report paper.

[0169] Furthermore, in the second to fourth embodiments described above, the rigid members 1021Da to 1021Fa for forming the first uneven patterns PTD1 to PTF1 on the first layer portions 1021D to 1021F of the elastic material layers 102D to 102F are formed by UV printing with UV-curing ink. However, the method for forming the rigid members is not limited to UV printing; any method that can form rigid members is acceptable. Alternatively, the uneven shape may be formed by deforming the surface of the substrate. Similarly, the transfer uneven portion 402 formed on the substrate film 401 of the transfer film member 400 is not limited to a method using UV printing with UV-curing ink.

[0170] Furthermore, although the rigid members 1021Da to 1021Fa for forming the first uneven pattern are formed as a grid pattern in the above embodiment, they are not limited to a grid pattern. For example, short linear UV-curable resin may be arranged on the substrate. Alternatively, dot-shaped UV-curable resin may be arranged within the first layer portions 1021D to 1021F of the elastic material layer or on the substrate.

[0171] Furthermore, when the pen input device sheet is intended for use in a pen tablet type terminal that is not placed on a display screen, the adhesive layer, base material, and elastic material layer can be made of non-optical materials. However, when it is placed on a display screen, it must be made of a material with optical properties.

[0172] Furthermore, although the electronic pen and position detection device in the above-described embodiment were configured using an electromagnetic induction method, the electronic pen and position detection device using the pen input device sheet according to this invention are not limited to the electromagnetic induction method, but may be of any other type, such as an electrostatic coupling method or other methods. [Explanation of symbols]

[0173] 1… Electronic pen 1R…resonant circuit 100, 100A, 100B, 100C, 101D, 101E, 101F… Sheets for pen input devices 101,101E,101F…Base material 102, 102A, 102B, 102C, 102D, 102E, 102F… Elastic material layers 102S…Exposed surface 103,103C,103D…adhesive layer 1021, 1021D, 1021E, 1021F... First layer 1022, 1022D, 1022E, 1022F... Second layer 1023, 1023D, 1023E... Third layer PT1, PTD1, PTE1, PTF1... First uneven pattern PT2, PTD2, PTE2, PTF2… Second type of uneven surface pattern C1, CD1, CE1, CF1... Recesses of the first uneven pattern P1, PD1, PE1, PF1... Convex parts of the first uneven pattern CD2, CE2... Recesses in the second uneven pattern P2a, P2b, PD2, PE2, PF2a, PF2b... The raised parts of the second uneven pattern HT…Maximum height of irregularities in the contour curve at the reference length H1...Height of the protrusions in the first uneven pattern H2...Height of the convex part of the second uneven pattern d1...Average spacing of contour curve elements at a given length 1021Da, 1021Ea, 1021Fa…Hard material 1021Db,1021Eb,1021Fb…Space 200... Tablet-type information terminal 201...Position detection device 202...Display device 202D…Display screen 300...Position detection device 310...Position detection sensor 400…Transfer film component 401…Base film 402...Transferable uneven areas 500... Glass top

Claims

1. A sheet for a pen input device, which is disposed on the position detection area of ​​a position detection sensor and comprises an elastic material layer having elasticity, wherein the side of the elastic material layer opposite to the position detection sensor side is the writing input surface side for an electronic pen, The elastic material layer has a first uneven pattern formed along a direction perpendicular to the thickness direction of the elastic material layer, and a second uneven pattern formed along a direction perpendicular to the thickness direction of the elastic material layer, and having an uneven pattern different from the first uneven pattern. The second uneven pattern is formed such that the average spacing between the uneven surfaces is smaller than that of the first uneven pattern. A sheet for a pen input device characterized by the following features.

2. A sheet for a pen input device, which is disposed on the position detection area of ​​a position detection sensor and comprises an elastic material layer having elasticity, wherein the side of the elastic material layer opposite to the position detection sensor side is the writing input surface side for an electronic pen, The elastic material layer has a first uneven pattern formed along a direction perpendicular to the thickness direction of the elastic material layer, and a second uneven pattern formed along a direction perpendicular to the thickness direction of the elastic material layer, and having an uneven pattern different from the first uneven pattern. The elastic material layer has multiple 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 uneven pattern is formed on the second layer portion, The second uneven pattern is formed on the bottom surface of the recesses and / or the upper surface of the protrusions of the first uneven pattern. A sheet for a pen input device characterized by the following features.

3. A sheet for a pen input device, which is disposed on the position detection area of ​​a position detection sensor and comprises an elastic material layer having elasticity, wherein the side of the elastic material layer opposite to the position detection sensor side is the writing input surface side for an electronic pen, The elastic material layer has a first uneven pattern formed along a direction perpendicular to the thickness direction of the elastic material layer, and a second uneven pattern formed along a direction perpendicular to the thickness direction of the elastic material layer, and having an uneven pattern different from the first uneven pattern. 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 first uneven pattern is formed on the first layer portion. The protrusions of the first uneven pattern are made of a material that is harder than the recesses of the first uneven pattern. The aforementioned rigid material component is made of ultraviolet-curing resin. A sheet for a pen input device characterized by the following features.

4. The protrusions of the first uneven pattern are made of a material that is harder than the material of the layer portion on which the first uneven pattern is not formed. The aforementioned rigid material component is made of ultraviolet-curing resin. The sheet for a pen input device according to feature 3.

5. The first uneven pattern is a grid pattern, The member made of the hard material is formed as a grid pattern that fits into the first uneven pattern. The sheet for a pen input device according to feature 3.

6. The first uneven pattern repeats the unevenness such that the average interval between the unevennesses is a predetermined value. A sheet for a pen input device according to any one of claims 1 to 3.

7. The second uneven pattern consists of repeating unevenness such that the average interval between unevennesses is a predetermined value, or unevenness arranged irregularly. A sheet for a pen input device according to any one of claims 1 to 3.

8. The second uneven pattern is formed by irregularities smaller in size than the irregularities of the first uneven pattern. A sheet for a pen input device according to any one of claims 1 to 3.

9. The elastic material layer has multiple 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, with the second uneven pattern formed on the writing input surface side of the second layer portion. The sheet for a pen input device according to feature 1.

10. The elastic material of the aforementioned elastic material layer is polyurethane resin. A sheet for a pen input device according to any one of claims 1 to 3.

11. The elastic material of the elastic material layer is polyvinyl chloride resin. A sheet for a pen input device according to any one of claims 1 to 3.

12. A base material layer is disposed on the side of the elastic material layer between the position detection sensor and the elastic material layer. A sheet for a pen input device according to any one of claims 1 to 3.

13. An adhesive layer is disposed on the side of the elastic material layer between the position detection sensor and the elastic material layer. A sheet for a pen input device according to any one of claims 1 to 3.

14. An adhesive layer is disposed on the surface on the substrate layer side between the position detection sensor and the substrate layer. The sheet for a pen input device according to feature 12.

15. The recesses in the first uneven pattern are not filled with material, but are filled with air. A sheet for a pen input device according to any one of claims 1 to 3.

16. The second uneven pattern is exposed on the writing input surface side. A sheet for a pen input device according to any one of claims 1 to 3.

17. The first uneven pattern is a grid pattern. A sheet for a pen input device according to any one of claims 1 to 3.

18. The first uneven pattern is a dot pattern. A sheet for a pen input device according to any one of claims 1 to 3.

19. The first uneven pattern is a dotted pattern, The member made of the hard material is formed as a dot pattern that fits into the uneven pattern. The sheet for a pen input device according to feature 3.

20. The second uneven pattern is exposed on the writing input surface side, It has fenders to prevent light reflection from the writing surface. The sheet for a pen input device according to feature 8.

Images