Retroreflective article comprising a transparent base sheet and

Details Retroreflective article comprising a transparent base sheet and Retroreflective article comprising a transparent base sheet and

1995-11-17

1997-09-23

Loney, Donald

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

264 134, 264 25, 264220, 264219, 264225, 264494, 156245, 1562755, 427487, 427510, B29D 1100

Patent

active

056700962

ABSTRACT:
A retroreflective article comprising a transparent 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 microlenses being wider and shorter than portions of true spheres, 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, wherein the second face has a coating of a nacreous pigment composition thereon. The article can include an optional layer of adhesive over the reflective layer to permit 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 making such base sheets, and a method for making a forming master.

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