| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent deterioration of luminance of a flexible planar lighting device by stably holding a reflection sheet arranged on the rear face side of a light guide plate even in a curved condition. <P>SOLUTION: Since the thickness T<SB POS="POST">BST</SB>of a double-sided tape 34 for fixing reflection sheet 16 to a housing frame 26 is formed to satisfy a relation of T<SB POS="POST">BST</SB>≥k.L.t/2r, a function as a cushion material for absorbing dimensional changes due to deformation of the housing frame 26 is sufficiently given to the double-sided tape 34. It was paid attention to the fact that the L as a parameter for obtaining the minimum limit of thickness T<SB POS="POST">BST</SB>of the double-sided tape 34 necessary for preventing separation of the reflection tape 34 is proportionate to the amount of changes in a length (diagonal length) of the light guide plate 12 which substantially rules the shape changes in surface direction (direction parallel to the surface) of the housing frame 26. The correction factor k is a factor for deriving the appropriate thickness of the double-sided tape 34, and is derived experimentally. <P>COPYRIGHT: (C)2013,JPO&INPIT |
