| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an LED lighting system which is widely bright with a light collection function and light diffusion function, exhibits light distribution characteristics with brightness in a front direction, and facilitates color temperature adjustment of illumination light. <P>SOLUTION: The LED lighting system 100 includes a plurality of LED elements 1, and a prism sheet 2 with a roughened inner surface in which light from a light source enters and is emitted therefrom. The prism sheet with the roughened inner surface includes a light diffusion layer 5 of which a surface contacting with a prism layer is roughened and which is disposed between a sheet-like body part 3 and the prism layer 4 having a prism group 41 with many unit prism elements 42 arrayed on an illumination side surface 22. An average curvature radius R2av of a curvature radius R2 at a vertex part of a projection 53 on the roughened surface with respect to a granular material 52 in a resin binder part 51 of the light diffusion layer is made smaller than an average radius R1av of a radius R1 of the granular material. In addition to the light collection function of the prism layer, the light diffusion function at the light diffusion layer can be provided. Furthermore, a light diffusion member and a color temperature changing layer may be included. <P>COPYRIGHT: (C)2011,JPO&INPIT |
