| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a lens sheet which can obtain high luminance by suppressing deterioration in a light condensing function even if being scraped with the other member, and to provide a back light unit and a display apparatus using the lens sheet. <P>SOLUTION: A lens sheet 20A is constituted of a base material 21 which has a plate shape and light transmissivity, a first lens array 30 which is constituted of a plurality of first lenses 31 extending along an emission surface side surface of the base material 21 and arranged in parallel with each other and a second lens array 40 which is constituted of a second lenses 41 extending along a direction crossing the first lens 31 at the emission surface side of the base material 21 and arranged in parallel with each other and having height different from that of the first lens 31 and a plurality of ribs 50 which have heights higher than those of the first lens 31 and the second lens 41. When hr denotes a height of the rib 50 and h denotes a height of a higher lens out of the first lens 31 and the second lens 41, a relation: h+10μm≤hr is satisfied. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
