Multilayer interference filter for photochromic lenses

Details Multilayer interference filter for photochromic lenses Multilayer interference filter for photochromic lenses

2004-03-26

2009-12-15

Nguyen, Thong (Department: 2872)

Optical: systems and elements

Light interference

Produced by coating or lamina

C359S359000, C359S581000

Reexamination Certificate

active

07633681

ABSTRACT:
A multi-layer thin film is provided preferably for use with photochromic lenses, wherein the thin film comprises a plurality of layers, preferably including dielectric layers, selected and arranged so as to reflect less than about 6 percent of the UVA rays in a range of about 315 to 400 nm, more preferably about 350 to 380 nm. The thin film preferably has an activation value greater than 25%.

REFERENCES:
patent: 3410625 (1968-11-01), Edwards
patent: 4805989 (1989-02-01), Nakajima
patent: 4852974 (1989-08-01), Melzig et al.
patent: 5381193 (1995-01-01), Wedding
patent: 5661596 (1997-08-01), Biro et al.
patent: 6175450 (2001-01-01), Andreani et al.
patent: 6926405 (2005-08-01), Ambler et al.

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