Title:
NOVEL MACHINING TECHNIQUES FOR RETROREFLECTIVE CUBE CORNER ARTICLE AND METHOD OF MANUFACTURE
Document Type and Number:
WIPO Patent Application WO1995011470
Kind Code:
A2
Abstract:
A method of machining a substrate to produce a cube corner element optical array (12). The method includes steps of directly machining a plurality of groove sets (14, 16, 20) into a directly machinable substrate to form an array having a plurality of geometric structures including cube corner elements (24, 26, 30), and machining at least two of the groove sets along the same path in the substrate but at different depths of groove to produce a geometric structure side surface having both an optical portion and a non-optical portion.
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Inventors:
BENSON GERALD M
SMITH KENNETH L
SMITH KENNETH L
Application Number:
PCT/US1994/012016
Publication Date:
April 27, 1995
Filing Date:
October 20, 1994
Export Citation:
Assignee:
MINNESOTA MINING & MFG (US)
International Classes:
B23B3/30; B23D1/20; G02B5/124; (IPC1-7): G02B5/124
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