Dai Nippon Printing Co., Ltd.

Dai Nippon Printingco., Ltd.

Shubou Taya

Masayuki Tsunekawa

Jun Tsujimoto

Kentaro Hata

Ryohei Miyata

Yosuke Takayama

Tomohiro Ogawa

Gen Furui

Junya Eguchi

Yoshinari Matsuda

Hiroyuki Morikane

Yuki Tobe

Provided is a method for selecting a touch panel pen writing member that enhances the efficiency for product design and quality management of writing members. A method for selecting a touch panel pen writing member, in which a writing member satisfying the following requirement A1-1 is selected as the touch panel pen writing member: &#x3c;Requirement A1-1&#x3e; A touch panel pen is secured in a state of being in contact with the surface of the touch panel pen writing member at an angle of 60 degrees, then while a vertical load of 100 gf is kept applied to the touch panel pen and while the touch panel pen writing member is moved 40 mm in one direction at a speed of 14 mm/second, the kinetic friction force in the movement direction given to the touch panel pen is measured at intervals of 0.001 seconds, and an average of the kinetic friction forces obtained every 0.001 second is calculated. Furthermore, after the movement of 40 mm in one direction of the touch panel pen writing member is completed, the vertical load of 100 gf applied to the touch panel pen is maintained, the touch panel pen is kept in the state of being in contact with the surface of the touch panel pen writing member at an angle of 60 degrees. In this state, the residual friction force in the movement direction given to the touch panel pen is measured at intervals of 0.001 seconds, and an average of residual friction forces obtained every 0.001 second is calculated. The average of the kinetic friction force and the average of the residual friction force satisfy a relationship '0.45&#x3c;average of residual friction force/average of kinetic friction force'.

Method for selecting touch panel pen writing member, touch panel system, touch panel pen writing member, touch panel, and display device

It is intended to provide a writing sheet for a touch panel pen which can offer favorable writing feeling. The present invention provides a writing sheet for a touch panel pen (A) given below, the writing sheet having a surface whose maximum peak height Rp of a roughness curve and maximum valley depth Rv of the roughness curve defined in JIS B0601: 2001 satisfy the following conditions (A1) and (A2), and whose average wavelength &#x3bb;a calculated according to the following expression (i) from average tilt angle &#x3b8;a and arithmetic average roughness Ra defined in JIS B0601: 2001 satisfies the following condition (A3): 2.0 &#x3bc;m&#x2264;Rp&#x2264;8.0 &#x3bc;m (A1), 0.8 &#x3bc;m&#x2264;Rv&#x2264;6.0 &#x3bc;m (A2), 45 &#x3bc;m&#x2264;&#x3bb;a&#x2264;300 &#x3bc;m (A3), and &#x3bb;a=2&#x3c0;&#xd7;(Ra/tan(&#x3b8;a)) (i), &#x3c;touch panel pen (A)&#x3e; the touch panel pen having an angled part in at least a portion of a tip region, wherein a volumetric change of the tip region upon application of a vertical load of 100 gf is 1.0% or less.

Writing sheet for touch panel pen, touch panel, touch panel system, display device, and method for selecting writing sheet for touch panel pen

Provided is an optical sheet which is excellent in anti-glare property, contrast, and image clarity, as well as capable of displaying a powerful moving image, wherein at least one surface of the optical sheet is an uneven surface, and the uneven surface satisfies following conditions (1) to (3), provided that Rzis a ten-point average roughness according to JIS B0601: 1994 with a cut-off value of 0.8 mm, Rzis a ten-point average roughness according to JIS B0601: 1994 with a cut-off value of 0.25 mm, and SD is a standard deviation of an arithmetic average roughness Raaccording to JIS B0601: 1994 with a cut-off value of 0.8 mm:0.300 &#x3bc;m&#x2264;&#x2264;0.650 &#x3bc;m&#x2003;&#x2003;(1)0.170 &#x3bc;m&#x2264;&#x2264;0.400 &#x3bc;m&#x2003;&#x2003;(2)SD&#x2264;0.015 &#x3bc;m&#x2003;&#x2003;(3).

Optical sheet, polarizing plate, optical sheet sorting method, optical sheet production method, and display device

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. &#x3c;condition 1-1&#x3e; 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. &#x3c;condition 1-2&#x3e; When a standard deviation &#x3c3; of the integrated values of the rated sound pressures P of the ten segments is calculated, &#x3c3; is 13,500 or less.

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

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Okayama, Japan

Shubou Taya