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:
Jul. 25, 2017
Filed:
Aug. 11, 2015
Canon Kabushiki Kaisha, Tokyo, JP;
Rie Ishimatsu, Utsunomiya, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
An antireflection film formed on a substrate having a refractive index between 1.40 and 1.85 inclusive for light having a wavelength of 550 nm includes an intermediate layer formed on the substrate, and a concavo-convex layer formed on the intermediate layer, the concavo-convex layer includes a part has a refractive index that continuously increases from a side closer to a surface toward a side closer to the substrate, the intermediate layer includes a plurality of thin film layers having different refractive indices, and at least one of the thin film layers has a refractive index higher than the refractive index of the substrate, and the thin film layers include a first layer formed on the substrate and having a physical thickness d, and a second layer formed on the first layer and having a physical thickness d, and satisfy predetermined conditional expressions.