Step gradient anti-iridescent coatings

Details Step gradient anti-iridescent coatings Step gradient anti-iridescent coatings

G - Physics

02

B

G02B 1/10 (2006.01) C03C 17/23 (2006.01) C03C 17/34 (2006.01) C03C 17/42 (2006.01) C23C 16/40 (2006.01)

Patent

CA 2068371

A glazing article comprises a substrate bearing a substantially transparent coating comprising an optically functional layer and a thinner anti-iridescence layer undercoat mediate the optically functional layer and the substrate. The anti-iridescence layer eliminates or substantially reduces iridescence and, in addition, is readily designed to make the overall coating colorless or to provide a substantially uniform, muted color. The anti-iridescence layer comprises a high refractive index zone on the substrate, having a refractive index higher than that of the substrate. Multiple gradient step zones are stacked on the high refractive index zone, including a low refractive index zone. A second gradient step zone having a refractive index higher than that of the first gradient step zone is positioned on the low refractive index zone, such that the low refractive index zone is directly sandwiched between the two higher refractive index zones. Anti-iridescence is provided for a wide variety of optically functional layers without significant impairment of the optical performance thereof.

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