The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 22, 2011
Filed:
Jan. 18, 2007
Hideharu Okami, Chiba, JP;
Hideharu Okami, Chiba, JP;
Sumitomo Metal Mining Co., Ltd., Tokyo, JP;
Abstract
An absorption type multi-layer film ND filter having a substrate formed of a resin film and on at least one side thereof an absorption type multi-layer film of oxide dielectric film layers and absorption film layers which are alternately wherein the oxide dielectric film layers are each a SiCyOx (0<y≦0.1, 1.5<x<2) film having an extinction coefficient at a wavelength of 550 nm of 0.005 to 0.05, formed by a physical vapor deposition process using a film-forming material composed chiefly of SiC and Si, and the absorption film layers are each a metal film having a refractive index at a wavelength of 550 nm of 1.5 to 3.0 and an extinction coefficient at that wavelength of 1.5 to 4.0, formed by a physical vapor deposition process; an outermost layer of the multi-layer film being one oxide dielectric film layer of SiCyOx.