Absorption type multi-layer film ND filter

Details Absorption type multi-layer film ND filter Absorption type multi-layer film ND filter

2007-07-03

2007-07-03

Boutsikaris, Leonidas (Department: 2872)

Optical: systems and elements

Absorption filter

Neutral or graded density

C359S885000, C359S585000

Reexamination Certificate

active

11179994

ABSTRACT:
An absorption type multi-layer film ND filter having a substrate and an optical multi-layer member consisting essentially of metal layers each composed chiefly of nickel (Ni) and dielectric layers each formed of any one of SiO2, Al2O3and a mixture of these; the layers being alternately layered on the substrate. An Ni type metallic material having a small wavelength dependence of transmittance in the visible spectral range is used in the metal layers serving as light attenuation layers, and this enables materialization of an ND filter which can attain transmittance attenuation that is flat for wavelengths.

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