| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a light guide plate unit capable of enhancing emission efficiency as compared with a conventional light guide plate, and of emitting high-luminance light; and to provide a flat lighting system using the light guide plate unit. <P>SOLUTION: This light guide plate unit 15 is composed by stacking three or more light guide plates 11-14 each equipped with: an incident end face part 16 for introducing light; a light emission surface part 23 for emitting light introduced from the surface part 16; a back surface part 21 positioned on the side opposite to the surface part 23; and a plurality of light deflection elements 24 formed at least either of the surface part 23 and the surface part 21 and each used for deflecting the emission direction of light. Between the surface part 23 of one-side light guide plate and the surface part 21 of the other-side light guide plate overlapping on each other, a spacer for keeping them at a predetermined distance is interlaid. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
