Patent ID: 8692962
Filing Date: 2014-04-08
Classification: B29D,G02B,G02F

Abstract:
1. A diffusion sheet, comprising: a substrate having a first principal surface and a second principal surface; and structures each in a convex shape distributed irregularly on the first principal surface or the second principal surface of the substrate; wherein a variation of heights of the structures K relative to an average height of the structures satisfies the relationship 0%<K≦10%, wherein the structures have an aspect ratio h/r, where r denotes an average radius of the structures and h denotes an average height of the structures, of more than 0.85 and not more than 1.50, wherein the structures have a filling factor of not less than 60% and not more than 80%, and wherein at least one of the structures includes a main body in a partially spherical form, and a non-spherical base portion extending from a bottom face of the main body towards the substrate at an angle ranging from greater than 85 degrees to less than 90 degrees relative to the first principal surface.