Absorption type multi-layer film ND filter

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

2009-09-23

2011-11-29

McNeil, Jennifer (Department: 1784)

Stock material or miscellaneous articles

Composite

Of inorganic material

C428S426000, C428S428000, C428S432000, C428S702000

Reexamination Certificate

active

08067102

ABSTRACT:
In an absorption type multi-layer film ND filter having a thin substrate and provided thereon first and second absorption type multi-layer films which attenuate transmitted light, the first and second absorption type multi-layer films are constituted of multi-layer films each consisting essentially of dielectric layers formed of SiO2, Al2O3or a mixture of these and metal film layers formed of Ni alone or an Ni alloy; the layers being alternately layered on the substrate; and the first and second absorption type multi-layer films are so formed on one side and the other side, respectively, of the substrate as to have a film structure in which they are symmetrical to each other interposing the substrate between them, and the warpage of the substrate has been controlled at a curvature of radius of 500 mm or more.

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“Optics Leading the Light,” Wavelength Technology Singapore Pte. Ltd., http://www.wavelength-tech.com/Material-MgF2.htm.

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