| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a condensing sheet and a surface light source device which condense light entering from a light source, and are be easily, stably and reliably manufactured. <P>SOLUTION: A total reflection film 34 is joined with a transparent adhesive layer 33 on an entrance surface 32a of a light guide part 32 having a unit form with a trapezoid cross-sectional form. A portion where the transparent adhesive layer 33 is present transmits light even when the total reflection part 34b is present, and a portion corresponding to a vacant portion S where no transparent adhesive layer 33 is present tototally reflects the entire light to return it. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
