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:
Apr. 30, 2019
Filed:
Mar. 03, 2015
Applicant:
Konica Minolta, Inc., Chiyoda-ku, JP;
Inventors:
Assignee:
KONICA MINOLTA, INC., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 1/10 (2015.01); G02B 5/28 (2006.01); G03B 11/00 (2006.01); G02B 5/20 (2006.01); H04N 5/225 (2006.01);
U.S. Cl.
CPC ...
G02B 5/285 (2013.01); G02B 5/208 (2013.01); G03B 11/00 (2013.01); H04N 5/2253 (2013.01); H04N 5/2254 (2013.01);
Abstract
In this optical filter, each side of a substrate that is at most 0.3 mm in thickness is coated with a multilayer film. Both of the multilayer films are under compressive stress, and the optical filter satisfies the relation F≥−1.25t+1.525 (where F represents the ratio of the strength of the optical filter to the strength of the substrate (the strength of the optical filter with the substrate coated divided by the strength of the uncoated substrate) and t represents the thickness of the substrate (in mm)).