F - Mech Eng,Light,Heat,Weapons – 21 – V
Patent
F - Mech Eng,Light,Heat,Weapons
21
V
240/150, 26/197
F21V 7/04 (2006.01)
Patent
CA 1094032
ABSTRACT OF THE DISCLOSURE: Retroreflective device made of a sheet of transparent material including bulges on opposite faces of the sheet, each bulge on one face of the sheet being arranged opposite a respective bulge on the other face of the sheet to define a globule. The surfaces of the bulges on one face of the sheet are uncoated and, in use, positioned for light impingement thereon. The surfaces of the bulges on the other face of the sheet are flatter in shape than the first mentioned surfaces and are provided with transparent microspheres having an external reflective coating applied to them. Also disclosed is a method for producing this device, which method comprises heating a sheet of thermoplastic transparent polymeric material of uniform thickness, passing it between two adjacent parallel cylinders, each cylinder including bulge-forming recesses arranged in their cylindrical surfaces so as to form the bulges in the sheet, the bulges being complementary to the recesses and the cylinders and associated recesses being arranged such that each bulge on one face is formed opposite a respective bulge on the other face, and applying coated transparent microspheres to the other face of the sheet.
344217
Eigenmann Ludwig
Perley-Robertson Hill & Mcdougall
LandOfFree
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