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:
Sep. 22, 2020
Filed:
Jan. 24, 2017
Applicant:
Ricoh Imaging Company, Ltd., Tokyo, JP;
Inventors:
Assignee:
RICOH IMAGING COMPANY, LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 1/11 (2015.01); G02B 1/115 (2015.01); G02B 5/28 (2006.01);
U.S. Cl.
CPC ...
G02B 1/115 (2013.01); G02B 1/11 (2013.01); G02B 5/286 (2013.01);
Abstract
An anti-reflection coating having an three-layer structure comprising first to third layers formed in this order on a substrate, the substrate having a refractive index of 1.6-1.9, the first layer having a refractive index of 1.37-1.57, the second layer having a refractive index of 1.75-2.5, and the third layer having a refractive index of 1.18-1.32, to light in a wavelength range of 550 nm; the third layer being formed by silica aerogel; and the first and second layers containing no AlO.