Patent ID: 7280277
Filing Date: 2007-10-09
Classification: B23K,B29C,B29D,G02B,Y10S

Abstract:
1. A method for manufacturing a light collimating and diffusing film, comprising: extruding heated plastic through a die to form a plastic layer, the plastic layer having a first side and a second side opposite the first side and at least a first peripheral edge, the plastic layer extending along both a first axis and a second axis, the first axis being substantially parallel to the first peripheral edge, the second axis being substantially perpendicular to the first axis; cooling at least one of first and second rotating cylindrical rollers below a predetermined temperature; and moving the plastic layer between first and second rotating cylindrical rollers, the first cylindrical roller contacting the first side of the plastic layer and the second cylindrical roller contacting the second side, the first cylindrical roller forming a first textured surface on the first side of the plastic layer, wherein between 7 to 20 percent of slope angles on the first textured surface proximate the first axis have a value between zero and five degrees.