Anti-iridescent coatings with gradient refractive index

Details Anti-iridescent coatings with gradient refractive index Anti-iridescent coatings with gradient refractive index

1991-06-24

1993-09-28

Thibodeau, Paul J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

427166, 427167, 427255, 4272553, 428 34, 428213, 428216, 428336, 428428, 428432, 428697, 428699, 428701, 428702, B32B 702

Patent

active

052485455

ABSTRACT:
A substantially transparent glazing article has an optically functional coating on a transparent substrate. The coating has an optically functional topcoat layer and an anti-iridescence layer between the topcoat and the substrate. The refractive index anti-iridescence layer is (i) higher than the refractive index of the substrate in a first high refractive index zone directly on the substrate surface, (ii) lower than that of the first high refractive index zone in a low refractive index zone directly on the first high refractive index zone, and (iii) higher than that of the low refractive index zone in a second high refractive index zone directly on the low refractive index zone. The refractive index of the anti-iridescence layer varies in at least one of the zones substantially continuously with distance from the substrate surface. Contiguous zones may together form a single gradient index zone. The anti-iridescence layer is less thick than the optically functional layer and substantially reduces or eliminates iridescence without significantly impairing the optical functionality of the top coat layer.

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