| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a uniformed sheet, a surface light source device and a transmissive display apparatus which can perform a uniform illumination without unevenness, independently of a position where a screen is observed. <P>SOLUTION: Since two sorts of unit lens end part angles exist in each unit lens in a group of three unit lenses 141 to 143, six sorts of unit lens end part angles exist. Since unit lenses 144 to 146 have shapes inverted from the unit lenses 141 to 143, the values of the unit lens end part angles of the unit lenses 144 to 146 are the same as that of the unit lenses 141 to 143, but their directions are different from that of the unit lenses 141 to 143. Thereby twelve sorts of unit lens end part angles are included in a unit lens group, consisting of the unit lenses 141 to 146. Thus the formation of many unit lens end part angles prevents generation of uneven luminance due to the influence of light, even if a light that cannot be emitted regularly from the unit lens end parts is generated. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
