ND filter of optical film laminate type with carbon film...

Details ND filter of optical film laminate type with carbon film... ND filter of optical film laminate type with carbon film...

2005-09-16

2008-10-21

Chang, Audrey Y (Department: 2872)

Optical: systems and elements

Absorption filter

Neutral or graded density

C359S885000

Reexamination Certificate

active

07440204

ABSTRACT:
An ND filter is composed of a transparent substrate, a laminate of a light-absorbing film and a dielectric film formed on the transparent substrate, and a carbon film formed to clad a surface of the laminate of the light-absorbing films and the dielectric films. Depending on cases, another carbon film is also formed on a reverse side of the transparent substrate. The carbon film is formed by a deposition process at a deposition temperature ranging from a room temperature to 150° C. The light-absorbing film is formed of a mixture of metal and compound thereof, a material of the metal being selected from a group consisting of Ti, Cr, Ni, NiCr, NiFe, and NiTi. The dielectric film is formed of SiO2or Al2O3.

REFERENCES:
patent: 5715103 (1998-02-01), Amano et al.
patent: 6034820 (2000-03-01), Someno et al.
patent: 6671109 (2003-12-01), Kunii
patent: 6842302 (2005-01-01), Nakajima et al.
patent: 52-113236 (1977-09-01), None
patent: 07-063915 (1995-03-01), None

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