The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 06, 2020
Filed:
May. 31, 2017
Dai Nippon Printing Co., Ltd., Tokyo, JP;
Shubou Taya, Kyoto, JP;
Yosuke Takayama, Okayama, JP;
Tomohiro Ogawa, Tsukuba, JP;
Jun Tsujimoto, Bizen, JP;
DAI NIPPON PRINTING CO., LTD., Tokyo, JP;
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 P, 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 P, P/Pis 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.