Patent ID: 8405910

Claim:
A method for manufacturing an optical sheet, comprising the steps of: forming, on one surface of a base material as a sheet-shaped member, prisms to be arranged in parallel along the sheet surface of the optical sheet in a manner to transmit light; forming light-absorbing parts between the prisms; winding, in a roll, a stacked body having the prisms and the light-absorbing parts formed on the base material; after formation of the prisms and the light-absorbing parts, while winding back the stacked body that has been wound in a roll, applying an adhesive directly on the other surface of the base material by spraying it through a slit nozzle such that the thickness of the adhesive is uniformed; and winding, in a roil, a stacked body having layers of the base material, the prisms, the light-absorbing parts, and the adhesive.