| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical reflector constituted so that the uneven luminance of a surface light source may hardly occur, in spite of a long use while being attached to the surface light source device. <P>SOLUTION: The optical reflector is constituted of a white polyolefin film which contains polyolefin-based resin and filler, which is stretched in one or more axial directions, which has an area stretch ratio of 1.3 to 80, whose total light reflectivity is ≥95%, whose dimensional rate-of-change is ≤1.5% when left standing for 300 hours at 70°C, and whose melt starting temperature is ≥70°C. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
