SHEET-SHAPED OPTICAL MEMBER, RESIN COMPOSITION FOR OPTICAL SHEET, OPTICAL SHEET, AND PROCESS FOR PRODUCING THE OPTICAL SHEET

摘要

A main object of the present invention is to provide a sheet-shaped optical member which is less likely to cause damage to the shape of a lens part and can be produced with high productivity. The above object can be attained by a sheet-shaped optical member comprising a base material and a lens part provided on the base material, formed of an actinic radiation-cured resin, and provided with a plurality of unit prisms, characterized in that the maximum logarithmic decrement ?E of the lens part as measured by a rigid body pendulum method is not more than 0.4.