Coating processes – Optical element produced – Polarizer – windshield – optical fiber – projection screen – or...
Patent
1984-11-16
1986-02-11
Hoffman, James R.
Coating processes
Optical element produced
Polarizer, windshield, optical fiber, projection screen, or...
156249, G02B 5128
Patent
active
045698570
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.
Hoffman James R.
Minnesota Mining and Manufacturing Company
Sell Donald M.
Smith James A.
Tamte Roger R.
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