OPTICAL PIPE AND A LIGHTING DEVICE INCLUDING THE SAME, CAPABLE OF MAINTAINING UNIFORMITY OF BRIGHTNESS AND ILLUMINANCE ACCORDING TO THE LENGTH DIRECTION OF THE OPTICAL PIPE

摘要

PURPOSE: An optical pipe and a lighting device using the same are provided to reduce difference between a long distance and a short distance by diffusing the light by arranging a diffusion sheet between an optical film and a support.;CONSTITUTION: A support(510) is arranged outside an optical film(505). A diffusion sheet is arranged between the optical film and the support. A base film(515), a first diffusion layer(520), and a protective layer are formed on the diffusion sheet. The protective layer includes resin(520a,525a) and a bead(520b,525b) in the surface facing one side of the base film. In the diffusion sheet, a first diffusion layer is arranged to one direction of the inner part and outpour part of the optical pipe. The optical film has a prism shape in the first surface.;COPYRIGHT KIPO 2010