Absorption type multi-layer film ND filter

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

2005-09-19

2010-02-23

Speer, Timothy M (Department: 1794)

Stock material or miscellaneous articles

Composite

Of inorganic material

C428S432000, C428S688000, C428S689000, C428S690000, C428S469000, C428S702000, C359S888000, C359S585000

Reexamination Certificate

active

07666527

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.

REFERENCES:
patent: 3826728 (1974-07-01), Chambers et al.
patent: 4960310 (1990-10-01), Cushing
patent: 5715103 (1998-02-01), Amano et al.
patent: 6671109 (2003-12-01), Kunii
patent: 7239464 (2007-07-01), Okami et al.
patent: 2003/0026014 (2003-02-01), Kunii
patent: 2003/0190131 (2003-10-01), Barth
patent: 2004/0027706 (2004-02-01), Nakajima et al.
patent: 2005/0254155 (2005-11-01), Kunii et al.
patent: 55-47361 (1980-11-01), None
patent: 57-195207 (1982-11-01), None
patent: 10-133253 (1998-05-01), None
patent: 2000-96167 (2000-04-01), None
patent: 3359114 (2002-10-01), None
patent: 2002-350610 (2002-12-01), None
patent: WO2005047940 (2005-05-01), None
Optics Leading the Light.
Translation of WO2005047940 (www.espacenet.com) obtained Sep. 9, 2009.

Affiliated with

Also associated with

Rating

Absorption type multi-layer film ND filter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Absorption type multi-layer film ND filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Absorption type multi-layer film ND filter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4220654