Optical film and touch panel

• Main Authors: MINAKOSHI SEIKA, TAKAMIYA HIROYUKI, UENO KENJI
• Format: Patent
• Language: English
• Published: 06.10.2015
• Subjects: DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

A touch panel which prevents Newton ring formation and glare, shows high transmission image clarity, prevents haze and has high visibility, and an optical film which is applicable to such a touch panel. An optical film comprising an optically-transparent substrate and at least one hard coat layer (A) disposed on a surface of the optically-transparent substrate, wherein a surface of the hard coat layer (A), which is opposite to a surface where the optically-transparent substrate is present, has an arithmetic mean roughness (Ra) defined in JIS B0601 (1994) of 0.025 to 0.05 μm, and has 10 to 250 convex portions each having a height of 0.3 to 3 μm in a 1.08 mm square area.