| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical sheet provided with relief which has excellent stability and is difficult to scratch, an active-energy-ray-curable resin composition for optical members which is suitable for forming the relief, and a surface light source device and a liquid crystal display device employing the optical sheet.SOLUTION: The optical sheet includes a transparent base material and an optical function exhibition part which is provided on one surface side of the transparent base material and has relief having a plurality of unit relief structures on the side opposite to the transparent base material. The optical function exhibition part comprises a cured material of the active-energy-ray-curable resin composition containing an acrylic resin and/or a methacrylate resin, and at apexes of the unit relief structures, an indentation depth measured with an indentation load of 0.5 mN in compliance with ISO14577-1 is equal to or greater than 0.6 μm, an indentation depth measured with an indentation load of 300 mN is equal to or greater than 15 μm, or a recovery rate obtained by specific microhardness measurement is equal to or greater than 55%. |
