Infrared filter

Details Infrared filter Infrared filter

2005-04-12

2005-04-12

Dunn, Drew A. (Department: 2872)

Optical: systems and elements

Having significant infrared or ultraviolet property

Multilayer filter or multilayer reflector

C359S350000

Reexamination Certificate

active

06879438

ABSTRACT:
The present invention relates to an infrared filter comprising a biaxially oriented co-extruded film having at least three polyester layers comprising an intermediate polyester layer and the surface polyester layers on both sides of the said intermediate layer,said intermediate layer containing a near infrared absorber having an absorption peak at 800 to 1,100 nm in an amount of 0.1 to 10% by weight based on the weight of the intermediate layer,the light transmittance of said film being not higher than 30% at 950 nm, andthe average center line roughness (Ra) of the film surface on at least one side being 10 to 30 nm.

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