Method for selecting writing sheet for stylus, touchscreen system, writing sheet for stylus, touchscreen, and display device

Patent metadata

Field	Value
Publication number	US-10795496-B2
Application number	US-201716307078-A
Country	US
Kind code	B2
Filing date	May 31, 2017
Priority date	Jun 6, 2016
Publication date	Oct 6, 2020
Grant date	Oct 6, 2020

Abstract

It is intended to provide a method for selecting a writing sheet for a touch panel pen that can accurately select a writing sheet with which the generation of unpleasant sounds during writing is suppressed. According to the method for selecting a writing sheet for a touch panel pen, a sheet satisfying condition 1-1 and condition 1-2 described below is selected as a writing sheet for a touch panel pen. <condition 1-1> Sound generated when writing is performed under predetermined conditions using a touch panel pen on the surface of a writing sheet for a touch panel pen is recorded. The sound pressure (dB/Hz) is calculated for each 1 Hz from the recorded sound by means of fast Fourier transform. The values of the dB/Hz at frequencies from 1 Hz to 20,000 Hz are normalized to have a maximum value of 100 and a minimum value of 0, and the normalized values of dB/Hz are adopted as rated sound pressures P. The frequencies from 1 Hz to 20,000 Hz are divided into ten segments of 2,000 Hz each, and integrated values of the rated sound pressures P of each segment are calculated. When the integrated value of the rated sound pressures P for frequencies of 1 Hz or more and less than 2,000 Hz as a first segment is represented by P1, and the integrated value of the rated sound pressures P for frequencies of 18,000 Hz or more and 20,000 Hz or less as a tenth segment is represented by P10, P1/P10 is 1.25 or more. <condition 1-2> When a standard deviation σ of the integrated values of the rated sound pressures P of the ten segments is calculated, σ is 13,500 or less.

First claim

The invention claimed is:

1. A method for selecting a writing sheet for a touch panel pen, comprising evaluating a writing sheet for the following conditions 1-1 and 1-2, and selecting as the writing sheet for the touch panel pen a sheet that satisfies the following conditions 1-1 and 1-2:
<condition 1-1>
a sound that arises when a touch panel pen is brought into contact with a surface of a writing sheet for a touch panel pen at an acute angle of 25 to 35 degrees and, while maintaining the angle, a vertical load of 45 to 55 gf is applied to the touch panel pen and the touch panel pen is reciprocatingly moved 45 to 55 mm in one-way length at a rate of 180 to 220 mm/sec is recorded;
when recording, the sound is converted from an analog signal to a digital signal at a sampling frequency of 44.1 kHz and recorded; a soundless portion is added to before and after the sound converted into a digital signal so that an overall time period of the digital signal becomes 0.7 seconds; the digital signal to which the soundless portion has been added is subjected to fast Fourier transform in which a range of variables is 1 Hz to 22,000 Hz and the Hanning window is adopted as a window function, and a sound pressure (dB/Hz) is calculated for each 1 Hz;
values of the dB/Hz at frequencies from 1 Hz to 20,000 Hz are normalized to have a maximum value of 100 and a minimum value of 0; the normalized values of dB/Hz are adopted as rated sound pressures P; the frequencies from 1 Hz to 20,000 Hz are divided into ten segments of 2,000 Hz each, and integrated values of the rated sound pressures P of each segment are calculated; when an integrated value of the rated sound pressures P for frequencies of 1 Hz or more to less than 2,000 Hz that is a first segment is represented by P 1 , and an integrated value of the rated sound pressures P for frequencies of 18,000 Hz or more to 20,000 Hz or less that is a tenth segment is represented by P 10 , P 1 /P 10 exhibits a value of 1.25 or more; and

<condition 1-2>
when a standard deviation σ of the integrated values of the rated sound pressures P of the ten segments is calculated, σ exhibits a value of 13,500 or less.

2. The method for selecting a writing sheet for a touch panel pen according to claim 1 , further comprising evaluating the sheet for the following condition 2-1 and selecting the sheet as the writing sheet for the touch panel pen if it satisfies the following condition 2-1:
<condition 2-1>
an arithmetic average roughness Ra defined in JIS B0601: 2001 with a cutoff value of 0.8 mm of the surface is 0.2 μm or more and 0.8 μm or less.

3. A touch panel system comprising: a touch panel comprising a writing sheet for a touch panel pen on a surface; and a touch panel pen, wherein the touch panel system satisfies the following conditions 1-1 and 1-2:
<condition 1-1>
a sound that arises when the touch panel pen is brought into contact with a surface of the writing sheet for a touch panel pen at an acute angle of 25 to 35 degrees and, while maintaining the angle, a vertical load of 45 to 55 gf is applied to the touch panel pen and the touch panel pen is reciprocatingly moved 45 to 55 mm in one-way length at a rate of 180 to 220 mm/sec is recorded;
when recording, the sound is converted from an analog signal to a digital signal at a sampling frequency of 44.1 kHz and recorded; a soundless portion is added to before and after the sound converted into a digital signal so that an overall time period of the digital signal becomes 0.7 seconds; the digital signal to which the soundless portion has been added is subjected to fast Fourier transform in which a range of variables is 1 Hz to 22,000 Hz and the Hanning window is adopted as a window function, and a sound pressure (dB/Hz) is calculated for each 1 Hz;
values of the dB/Hz at frequencies from 1 Hz to 20,000 Hz are normalized to have a maximum value of 100 and a minimum value of 0; the normalized values of dB/Hz are adopted as rated sound pressures P; the frequencies from 1 Hz to 20,000 Hz are divided into ten segments of 2,000 Hz each, and integrated values of the rated sound pressures P of each segment are calculated; when an integrated value of the rated sound pressures P for frequencies of 1 Hz or more to less than 2,000 Hz that is a first segment is represented by P 1 , and an integrated value of the rated sound pressures P for frequencies of 18,000 Hz or more to 20,000 Hz or less that is a tenth segment is represented by P 10 , P 1 /P 10 exhibits a value of 1.25 or more; and

<condition 1-2>
when a standard deviation σ of the integrated values of the rated sound pressures P of the ten segments is calculated, σ exhibits a value of 13,500 or less.

4. A writing sheet for a touch panel pen having a surface that satisfies the following conditions 1-1 and 1-2:
<condition 1-1>
a sound that arises when a touch panel pen is brought into contact with a surface of a writing sheet for a touch panel pen at an acute angle of 25 to 35 degrees and, while maintaining the angle, a vertical load of 45 to 55 gf is applied to the touch panel pen and the touch panel pen is reciprocatingly moved 45 to 55 mm in one-way length at a rate of 180 to 220 mm/sec is recorded;
when recording, the sound is converted from an analog signal to a digital signal at a sampling frequency of 44.1 kHz and recorded; a soundless portion is added to before and after the sound converted into a digital signal so that an overall time period of the digital signal becomes 0.7 seconds; the digital signal to which the soundless portion has been added is subjected to fast Fourier transform in which a range of variables is 1 Hz to 22,000 Hz and the Hanning window is adopted as a window function, and a sound pressure (dB/Hz) is calculated for each 1 Hz;
values of the dB/Hz at frequencies from 1 Hz to 20,000 Hz are normalized to have a maximum value of 100 and a minimum value of 0; the normalized values of dB/Hz are adopted as rated sound pressures P; the frequencies from 1 Hz to 20,000 Hz are divided into ten segments of 2,000 Hz each, and integrated values of the rated sound pressures P of each segment are calculated; when an integrated value of the rated sound pressures P for frequencies of 1 Hz or more to less than 2,000 Hz that is a first segment is represented by P 1 , and an integrated value of the rated sound pressures P for frequencies of 18,000 Hz or more to 20,000 Hz or less that is a tenth segment is represented by P 10 , P 1 /P 10 exhibits a value of 1.25 or more; and

<condition 1-2>
when a standard deviation σ of the integrated values of the rated sound pressures P of the ten segments is calculated, σ exhibits a value of 13,500 or less.

5. A touch panel comprising a sheet on a surface, wherein a writing sheet for a touch panel pen according to claim 4 is placed as the sheet such that the side that satisfies the conditions 1-1 and 1-2 provides a writing surface the touch panel.

6. A display device with a touch panel, the display device comprising the touch panel on a display component, wherein the touch panel is a touch panel according to claim 5 .

Assignees

• Dainippon Printing Co Ltd

Inventors

• Taya Shubou
• Takayama Yosuke
• Ogawa Tomohiro
• Tsujimoto Jun

Classifications

• G06F3/0393 Primary

  Accessories for touch pads or touch screens, e.g. mechanical guides added to touch screens for drawing straight lines, hard keys overlaying touch screens or touch pads · CPC title

• H04R2499/15

  Transducers incorporated in visual displaying devices, e.g. televisions, computer displays, laptops · CPC title

• H04R1/028

  associated with devices performing functions other than acoustics, e.g. electric candles · CPC title

• G06F3/041 Primary

  Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means · CPC title

• G06F3/0416 Primary

  Control or interface arrangements specially adapted for digitisers · CPC title