Optical microstructure film and method for fabricating the same

摘要

An optical microstructure film includes a base and multiple microstructure units. The base has at least a surface. The microstructure units are disposed in an array manner on the surface of the base. Each microstructure unit is formed to be a polygonal cone having the bottom face is attached to the surface of the base. The concave region is a surface part of a pseudo-spherical structure having a lower point on the microstructure unit. The distance from the lower point to the bottom face is defined as a second height, the sum of a radius of the spherical structure and the second height is defined as a first height, and the ratio of the second height to the first height is ranged from 0.1 to 0.8.

主权项

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.