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, 2022
Filed:
Mar. 12, 2020
Applicant:
Optrontec Co., Ltd., Changwon-si, KR;
Inventors:
Assignee:
OPTRONTEC CO., LTD., Changwon-si, KR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 5/20 (2006.01); G02B 5/28 (2006.01);
U.S. Cl.
CPC ...
G02B 5/285 (2013.01); G02B 5/208 (2013.01); G02B 5/281 (2013.01); G02B 5/288 (2013.01);
Abstract
An optical filter includes a substrate and a first filter layer stacked on a first surface of the substrate. The first filter layer includes a plurality of lower refractive index layers having a refractive index of less than 3; a plurality of higher refractive index layers having a refractive index of greater than 3; and a plurality of medium refractive index layers having a refractive index of 3 or more and smaller than that of the higher refractive index layers, and one higher refractive index layer and one medium refractive index layer are interposed in at least one of regions between two lower refractive index layers.