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:
Jan. 31, 2023
Filed:
Dec. 19, 2018
Applicant:
Nidec Sankyo Corporation, Nagano, JP;
Inventor:
Yosuke Kanzaki, Nagano, JP;
Assignee:
NIDEC SANKYO CORPORATION, Nagano, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 13/06 (2006.01); H04N 5/232 (2006.01); G02B 1/11 (2015.01);
U.S. Cl.
CPC ...
G02B 13/06 (2013.01); G02B 1/11 (2013.01); H04N 5/23238 (2013.01);
Abstract
A wide-angle lens () includes a front group (), an aperture (), and a rear group (). The front group () includes a first lens () and a second lens () arranged from a side (La) closest to an object to an image side (Lb). In such a wide-angle lens, to suppress an occurrence of a ghost caused by multiple reflection between a lens surface () of the first lens () on the image side (Lb) and a lens surface () of the second lens () on the object side (La), the sag amount Sag21 (mm) and the diameter D21 (mm) of the lens surface () satisfy the following conditional expression: 0<|Sag21/(D21/2)|<0.125.