05254390 is referenced by 109 patents and cites 23 patents.

An article comprising a transparent plano-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 microlenses 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 enhance the security provided thereby. Also, a method for forming such articles.

Title
Plano-convex base sheet for retroreflective articles and method for making same
Application Number
7/613136
Publication Number
5254390
Application Date
November 15, 1990
Publication Date
October 19, 1993
Inventor
Shih Lai Lu
Woodbury
MN, US
Agent
Robert H Jordan
Walter N Kirn
Gary L Griswold
Assignee
Minnesota Mining and Manufacturing Company
MN, US
IPC
B32B 3/00
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