ND filter and aperture diaphragm apparatus

Details ND filter and aperture diaphragm apparatus ND filter and aperture diaphragm apparatus

2007-06-12

2007-06-12

Boutsikaris, Leonidas (Department: 2872)

Optical: systems and elements

Absorption filter

Neutral or graded density

C359S889000, C359S588000, C359S589000, C396S108000, C396S164000

Reexamination Certificate

active

11128295

ABSTRACT:
An ND filter is made of a transparent substrate having a plane. An optical film is formed on the plane of the transparent substrate. The optical film has a lamination structure including a light absorption film and a dielectric film, and has a variable transmission density. A thickness of either the light absorption film or the dielectric film of the lamination structure is changed in an in-plane direction of the transparent substrate so that the transmission density of the optical film is controlled to vary in the in-plane direction. The light absorption film is composed of a material selected from Ti, Cr, Ni, NiCr, NiFe, NiTi and a mixture thereof, and the dielectric film is formed of SiO2, Al2O3or a compound thereof.

REFERENCES:
patent: 3943019 (1976-03-01), Krekeler et al.
patent: 5479298 (1995-12-01), Yanagi et al.
patent: 6671109 (2003-12-01), Kunii
patent: 6952314 (2005-10-01), Yanagi et al.
patent: 59-38701 (1984-03-01), None
patent: 10-96971 (1998-04-01), None

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