Automatic darkening filter with offset polarizers

Details Automatic darkening filter with offset polarizers Automatic darkening filter with offset polarizers

G - Physics

02

F

G02F 1/1347 (2006.01) A61F 9/06 (2006.01) G02F 1/1335 (2006.01)

Patent

CA 2600415

A protective automatic darkening filter construction 10 includes two low twist liquid crystal cells 26, 30 interspersed between a series of offset polarizers 24, 28, 32. The resulting construction provides improved homogeneity in the dark state as viewed by the user over a large viewing angle. By reducing variations in shade, visibility through the filter may be improved.

L'invention concerne une construction de filtre protecteur à auto-ombrage (10) qui comprend deux cellules de cristaux liquides à faible torsion (26, 30) intercalées entre une série de polariseurs décalés (24, 28, 32). Ladite construction permet d'obtenir une homogénéité améliorée à l'état sombre tel que visualisé par un utilisateur sur un grand angle de visualisation. La visibilité à travers le filtre peut être améliorée par réduction des variations d'ombre.

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