G - Physics – 02 – B
Patent
G - Physics
02
B
G02B 5/13 (2006.01) B29C 33/42 (2006.01) B29C 35/08 (2006.01) B29C 41/22 (2006.01) B29D 11/00 (2006.01) B32B 38/14 (2006.01) G02B 3/00 (2006.01) G02B 5/126 (2006.01) G06K 19/08 (2006.01) B29C 33/38 (2006.01)
Patent
CA 2092816
An article comprising a transparent piano-convex base sheet having first and second broad faces, the second face being substantially planar and the first face having an array of substantially hemi- spheroidal microlenses thereon, the shape of the mic- rolenses and thickness of the base sheet being such that collimated light substantially orthogonally incident to the array is focused approximately at the second face. The article optionally further comprising a specularly reflective layer on the second face which renders the base sheet retroreflective. An optional layer of adhesive over the reflective layer permits the article to be adhered to a document as a tamper-indicating, authenticating, and protective overlay. Special images can be formed within the article to en- hance the security provided thereby. Also, a method for forming such articles.
Minnesota Mining And Manufacturing Company
Smart & Biggar
LandOfFree
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