公开(公告)号：US10732733B2

公开(公告)日：2020-08-04

申请号：US16060303

申请日：2016-12-05

Applicant: DAI NIPPON PRINTING CO., LTD.

Inventor： Shubou Taya ,  Ryohei Miyata ,  Kentaro Hata ,  Masayuki Tsunekawa

IPC: G06F3/041 ,  G06F3/0354 ,  B32B7/00 ,  G06F1/16 ,  G06F3/01 ,  G06F3/044 ,  G06F3/045

Abstract: 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 λa calculated according to the following expression (i) from average tilt angle θa and arithmetic average roughness Ra defined in JIS B0601: 2001 satisfies the following condition (A3): 2.0 μm≤Rp≤8.0 μm (A1), 0.8 μm≤Rv≤6.0 μm (A2), 45 μm≤λa≤300 μm (A3), and λa=2π×(Ra/tan(θa)) (i), 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.

公开(公告)号：US10908711B2

公开(公告)日：2021-02-02

申请号：US16788810

申请日：2020-02-12

Applicant: DAI NIPPON PRINTING CO., LTD.

Inventor： Shubou Taya ,  Ryohei Miyata ,  Kentaro Hata ,  Masayuki Tsunekawa

IPC: G06F3/041 ,  G06F3/0354 ,  B32B7/00 ,  G06F1/16 ,  G06F3/01 ,  G06F3/044 ,  G06F3/045

Abstract: 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 λa calculated according to the following expression (i) from average tilt angle θa and arithmetic average roughness Ra defined in JIS B0601: 2001 satisfies the following condition (A3): 2.0 μm≤Rp≤8.0 μm (A1), 0.8 μm≤Rv≤6.0 μm (A2), 45 μm≤λa≤300 μm (A3), and λa=2π×(Ra/tan(θa)) (i), 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.

公开(公告)号：US10908333B2

公开(公告)日：2021-02-02

申请号：US16482116

申请日：2018-01-30

Applicant: DAI NIPPON PRINTING CO., LTD.

Inventor： Takahisa Nomura ,  Takanori Hamada ,  Masataka Nakashima ,  Kentaro Hata ,  Hiroshi Nakamura ,  Hiroki Nakagawa

IPC: H01L27/00 ,  G02B5/20 ,  H01L51/52 ,  H01L27/32

Abstract: Provided is an optical film 10 including a light-transmitting base material 11 and a light-transmitting functional layer 12 provided on one surface of the light-transmitting base material 11, wherein the optical film 10 has a spectral transmittance of less than 1% at a wavelength of 380 nm, a spectral transmittance of 10% or more and less than 60% at a wavelength of 410 nm, and a spectral transmittance of 70% or more at a wavelength of 440 nm, and wherein the light-transmitting functional layer 12 has a film thickness of 9 μm or less.