Patent ID: 7462305

Claim:
A method of manufacturing an optical sheet, said method comprising the steps of: cooling a molten thermoplastic resin base of a thermoplastic resin to obtain a flexible thermoplastic resin base having a surface temperature not higher than a glass transition point of the thermoplastic resin and an internal temperature not lower than the glass transition point thereof; coating a surface of the flexible thermoplastic resin base with a radiation-curable resin; pressing the flexible thermoplastic resin base against a radiation-curable resin shaping roller such that the radiation-curable resin coating the thermoplastic resin base is pressed against a circumference, formed in a raised die pattern, of the radiation-curable resin shaping roller and the raised die pattern formed in the circumference of the radiation-curable resin shaping roller is imparted to the surface of the radiation-curable resin to form a first optical structure having a surface shape complementary to the raised die pattern of the radiation-curable resin shaping roller; and curing the first optical structure by irradiating the first optical structure of the radiation-curable resin formed on the thermoplastic resin base with radiation.