G - Physics – 02 – B
Patent
G - Physics
02
B
76/24, 88/113.18
G02B 5/122 (2006.01) G02B 5/124 (2006.01)
Patent
CA 1319551
60557-3646 ABSTRACT There is described retroreflective material comprising a transparent surface layer having a front side and a back side and an array of cube-corner reflective elements, each of the reflecting elements including: a rectangular base on the back side of the surface layer; two rectangular faces approximately perpendicular to each other, each one being joined to an edge of the rectangular base to form a reflecting element having a triangular cross section; and two triangular faces that are approximately parallel to each other and approximately perpend- icular to the rectangular faces, and forming the ends of the reflecting elements. The triangular and the rectangular faces define a pair of cube-corners therebetween; the reflecting elements being formed by two approximately perpendicular sets of parallel grooves, a first set of V-shaped grooves, and a second set of grooves having a pair of faces nearly perpendicular to the rectangular base. At lease one of the sets of grooves includes more than one groove having a groove side angle that differs from another groove side angle of the same set by a small amount less than 3°. The array of cube-corner retroreflective elements is characterized by small variations in at least one of the dihedral angles between the faces from one reflecting element to another, the variations existing in at least some but not necessarily all of the reflecting elements.
600167
Appeldorn Roger Henry
Gardiner Mark Edward
Hoopman Timothy Lee
Nelson John Carl
Minnesota Mining And Manufacturing Company
Smart & Biggar
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