Retroreflective sheeting including cube corner elements

Abstract

The present disclosure is directed to lamina(e) comprising cube corner elements, a tool comprising an assembly of laminae and replicas thereof. The disclosure further relates to retroreflective sheeting.

We claim: 
     
         1 . Retroreflective sheeting, comprising:
 a plurality of cube corner elements;   wherein at least one of the cube corner elements has three dihedral angle errors having a magnitude between 1 arc minute and 60 arc minutes;   wherein at least one of the cube corner elements forms a hexagonal shape when viewed in plan view; and   wherein at least one of the cube corner elements forms a pentagonal shape when viewed in plan view;   wherein the cube corner elements comprise preferred geometry cube corner elements,   wherein the cube corner elements comprise polycarbonate material.   
     
     
         2 . The retroreflective sheeting of  claim 1 , wherein two of the three dihedral angle errors on a cube corner element are different from each other. 
     
     
         3 . The retroreflective sheeting of  claim 2 , wherein two of the three dihedral angle errors on a cube corner element are different in magnitude from each other. 
     
     
         4 . The retroreflective sheeting of  claim 2 , wherein the dihedral angle errors are varied in a repeating pattern. 
     
     
         5 . The retroreflective sheeting of  claim 1 , wherein three of the three dihedral angle errors on a cube corner element are different from each other. 
     
     
         6 . The retroreflective sheeting of  claim 5 , wherein three of the three dihedral angle errors on a cube corner element are different in magnitude from each other. 
     
     
         7 . The retroreflective sheeting of  claim 5 , wherein the dihedral angle errors are varied in a repeating pattern. 
     
     
         8 . The retroreflective sheeting of  claim 1 , wherein more than two of the cube corner elements are in a row wherein at least one dihedral edge of the cube corner elements range from being nominally parallel to nonparallel by less than 1°. 
     
     
         9 . The retroreflective sheeting of  claim 1 , wherein at least one cube corner element has a first face and the first faces define a primary groove face. 
     
     
         10 . The retroreflective sheeting of  claim 1 , wherein the retroreflective sheeting comprises cube corner cavities. 
     
     
         11 . The retroreflective sheeting of  claim 1 , wherein the sheeting further comprises a seal film. 
     
     
         12 . The retroreflective sheeting of  claim 1 , wherein the sheeting is white. 
     
     
         13 . The retroreflective sheeting of  claim 1 , wherein the sheeting further comprises a specular reflective coating.