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:
Aug. 02, 2016
Filed:
Jun. 10, 2013
Applicant:
Canon Kabushiki Kaisha, Tokyo, JP;
Inventor:
Takeharu Okuno, Utsunomiya, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B 1/11 (2015.01); G02B 1/116 (2015.01); G02B 1/118 (2015.01);
U.S. Cl.
CPC ...
G02B 1/11 (2013.01); G02B 1/116 (2013.01); G02B 1/118 (2013.01);
Abstract
An antireflection coating film formed on an optical base member includes: a first layer having a refractive index of Nand a film thickness of D; a second layer having a refractive index of Nand a film thickness of D; and a third layer formed of a fine concavo-convex structure, having a refractive index changing from Nto 1.0, and a film thickness of D, wherein the first, second, and third layer are formed in order from the optical base member side having a refractive index of Nsub, and wherein when the refractive indexes Nsub, N, N, and Nare those taken when a wavelength is 550 nm, conditions for Nsub, N, D, N, D, Nand Dare satisfied.