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

摘要

When the apparent Young's modulus of the nib and shaft structure is E, the nib diameter is D, and the arithmetic average height of the cross section curve in the unit measurement section (0.5 mm) of the nib is Pa (X ( MN / m) = [E × D × D] / Pa is a writing sheet for touch panel pens where X is 500 MN / m or less, and the writing sheet is JIS B0601: Cut-off value 0.8 mm The maximum height roughness Rz0.8 of 2001, the maximum valley depth Rv0.8 of the roughness curve, and the local peak sum average distance S2.5 of JIS B0601: 1994 with a cut-off value of 2.5 mm satisfy the condition 0.35. A writing sheet for a touch panel pen having a surface satisfying ≦ Rv0.8 / Rz0.8 ≦ 0.60 and 0.05 mm ≦ S2.5 ≦ 0.30 mm.