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:
Nov. 27, 2007
Filed:
Jun. 09, 2005
Minoru Otani, Honjo, JP;
Ryuji Biro, Utsunomiya, JP;
Hirotaka Fukushima, Utsunomiya, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
In an anti-reflective film including alternating layers of high refractive-index layers and low refractive-index layers, by designing such that a designed central wavelength λis within a wavelength range of 141 nm to 189 nm, and that when the first to eighth layers as counted from a substrate have optical film thicknesses dto drespectively, the equations of:0.45λ≦d≦0.65λ;0.05λ≦d≦0.20λ;0.29λ≦d≦0.49λ;0.01λ≦d≦0.15λ;0.05λ≦d≦0.20λ;0.23λ≦d≦0.28λ;0.23λ≦d≦0.28λ; and0.23λ≦d≦0.28λare satisfied, the anti-reflective film can be formed so as to have a low reflectance for a light incident at such a large angle as 30 degrees or more, without increasing the whole thickness of the film.