| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical sheet which can prevent scratching of the surface of a light guide plate or the like to be laminated on the back face of the sheet while preventing sticking with the light guide plate or the like, and to provide a back light unit which can prevent irregularity in the luminance due to scratches by using the above optical sheet. SOLUTION: The optical sheet 1 has a base layer 2 made of a transparent synthetic resin and an optical functional layer 3 formed on the top face of the base layer 2. The base layer 2 contains a synthetic resin having the glass transition temperature of >=100 deg.C and <=180 deg.C and has a fine rugged pattern 4 by embossing on its back. The pencil hardness of the back face of the base layer 2 is preferably >=2B and <=HB, and the surface roughness (Rz) is preferably >=30 and <=60. |
