ND filter for aperture device and aperture device comprising...

Details ND filter for aperture device and aperture device comprising... ND filter for aperture device and aperture device comprising...

2007-11-13

2007-11-13

Boutsikaris, Leonidas (Department: 2872)

Optical: systems and elements

Absorption filter

Neutral or graded density

C359S885000, C359S889000, C396S108000

Reexamination Certificate

active

11610741

ABSTRACT:
This invention decreases deformation of a plastic substrate caused by thermal expansion and contraction in an evaporation process of forming a multi-layered film of an ND filter, thus helping prevent wrinkles. The plastic substrate serving as the base of the ND filter is made of a polyimide-based plastic material having a glass transition temperature of 200° C. or more, has a total transmittance of light of 90% or more, and has a haze factor of 0.5% or less. As the multi-layered film, Al2O3films for reduction of the reflectance and TiOxfilms for reduction of the transmittance are alternately formed on the substrate.

REFERENCES:
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patent: 2004/0240068 (2004-12-01), Namazue et al.
patent: 2592949 (1996-12-01), None
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patent: 2004-037548 (2004-02-01), None
patent: 2004-117467 (2004-04-01), None
patent: 2005-062903 (2005-03-01), None

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