Patent ID: 7789650
Filing Date: 2010-09-07
Classification: B29C,B29D,B29L

Abstract:
1. Roller extruder for manufacturing a Fresnel lens angular lens segment comprising a pair of lens subsegments, a first or inner lens subsegment and a second or outer lens subsegment, the first or inner lens subsegment having a first outer edge and the second or outer lens subsegment having a second inner edge, the roller extruder comprising: a) blank roller; b) die roller having a first roller inner edge and a first roller outer edge, the die roller having two peripheral lens dies, the two peripheral lens dies comprising a first lens die and a second lens die, the first lens die and the second lens die being proximally joined proximal to the first roller inner edge and have a primary angular displacement of approximately one hundred eighty degrees proximal to the first roller outer edge, and the die roller having peripheral Fresnel facet dies, the peripheral lens dies providing, as the blank roller and the die roller rotate through one complete revolution, for the extrusion of the first or inner lens subsegment and the second or outer lens subsegment, and the Fresnel facet dies providing, as the blank roller and the die roller rotate through one complete revolution, for the impression of curved Fresnel facet grooves in the first or inner lens subsegment and the second or outer lens subsegment such that when the first or inner lens subsegment first outer edge is fitted to the second or outer lens subsegment second inner edge the Fresnel facet grooves of the first or inner lens subsegment and the second or outer lens subsegment have a common center of curvature; c) roller support structure; and d) roller drive mechanism.