Patent ID: 8951625
Filing Date: 2015-02-10
Classification: B32B,G02B,H01L,Y02E,Y10T

Abstract:
1. An optical microstructure film, made of a thermoplastic material, comprising: a base, having at least a surface; and a plurality of microstructure units, formed on the surface of the base in an array manner, each of the microstructure units further including a polygonal bottom to sit firmly on the surface of the base, each of the microstructure units also being formed as a polygonal cone having a top concave region, the polygonal cone having a removed tip for spherically centering the concave region, a radius R being defined as the radius of a pseudo sphere S having the surface of the concave region, a lower point of the microstructure unit being defined to the lowest point of the concave region, a distance between the lower point to the polygonal bottom being defined as a second height H2, a first height H1 being defined (H2) as a sum of the H2 and the R, a ratio of H2/H1 being ranged between 0.1 and 0.8; and wherein a volume Vp of said concave region is 0.05 to 0.4 of a volume of said pseudo sphere.