G - Physics – 02 – B
Patent
G - Physics
02
B
88/113.18
G02B 5/122 (2006.01) B29D 11/00 (2006.01) G02B 5/124 (2006.01) B29C 65/08 (2006.01)
Patent
CA 1321726
FN: 42962CAN7A Abstract of the Disclosure The present invention provides a retroreflective material which has improved retroreflectivity at high angles of incidence. The retroreflective material comprises a transparent surface layer and an array of reflecting elements, each of the reflecting elements including a rectangular base having a length L, two tetragonal faces nearly perpendicular to each other and having a line of intersection of length Y, the length Y being less than said length L, a triangular face nearly perpendicular to the tetragonal faces; and a non- perpendicular triangular face forming an angle Alpha with the plane perpendicular to the base, the angle Alpha being preferably about sin-1 (.25/n) to sin-1 (1/n), and more preferably about sin-1 (.35/n) to sin-1 (.9/n), where n is the refractive index of the reflecting elements, the perpendicular triangular face and the tetragonal faces defining an approximate cube corner therebetween and the non-perpendicular triangular face and the tetragonal faces forming a nonorthogonal corner therebetween, the reflecting elements arranged with their bases adjacent the surface layer.
606393
Cobb Sanford Jr.
Nelson John C.
Minnesota Mining And Manufacturing Company
Smart & Biggar
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