Coating processes – Electrical product produced – Integrated circuit – printed circuit – or circuit board
Patent
1983-09-16
1985-04-16
Arnold, Bruce Y.
Coating processes
Electrical product produced
Integrated circuit, printed circuit, or circuit board
427163, G02B 5128
Patent
active
045112100
ABSTRACT:
New methods for making "embedded-lens" retroreflective sheeting, and new forms of such sheeting, are provided. The new methods involve embedding microspheres into a web by continuously presenting a mass of the microspheres against the moving web and heating the web so as to soften at least an exterior stratum of the web, and adding a spacing layer to the microsphere-covered surface of the web. The microspheres are embedded on the average to less than 50 percent of their diameter, which has been found to cause the spacing layer to conform around a greater proportion of the back surface of individual microspheres and thereby position a greater portion of the specularly reflective layer carried on the spacing layer at the approximate focal point for light passed through the microspheres. Use of a preformed spacing layer also contributes to maintaining the spacing layer at a constant thickness around the back surface of the microspheres.
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Coderre James C.
Tung Chi F.
Arnold Bruce Y.
Minnesota Mining and Manufacturing Company
Propp William
Sell D. M.
Smith J. A.
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