Invention Grant
- Patent Title: Method for selecting writing sheet for stylus, touchscreen system, writing sheet for stylus, touchscreen, and display device
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Application No.: US16307078Application Date: 2017-05-31
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Publication No.: US10795496B2Publication Date: 2020-10-06
- Inventor: Shubou Taya , Yosuke Takayama , Tomohiro Ogawa , Jun Tsujimoto
- Applicant: DAI NIPPON PRINTING CO., LTD.
- Applicant Address: JP Tokyo
- Assignee: DAI NIPPON PRINTING CO., LTD.
- Current Assignee: DAI NIPPON PRINTING CO., LTD.
- Current Assignee Address: JP Tokyo
- Agency: Hamre, Schumann, Mueller & Larson, P.C.
- Priority: com.zzzhc.datahub.patent.etl.us.BibliographicData$PriorityClaim@2a1560d9
- International Application: PCT/JP2017/020225 WO 20170531
- International Announcement: WO2017/212996 WO 20171214
- Main IPC: G06F3/041
- IPC: G06F3/041 ; H04R7/04 ; H04R1/02

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. 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. 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.
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