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:
May. 07, 2019
Filed:
Jun. 26, 2017
Applicant:
Ricoh Imaging Company, Ltd., Tokyo, JP;
Inventor:
Masakazu Saori, Saitama, JP;
Assignee:
RICOH IMAGING COMPANY, LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 15/14 (2006.01); G02B 15/22 (2006.01); G02B 13/00 (2006.01); G02B 15/24 (2006.01); G02B 15/173 (2006.01); G02B 15/20 (2006.01); H04N 5/232 (2006.01);
U.S. Cl.
CPC ...
G02B 13/009 (2013.01); G02B 15/14 (2013.01); G02B 15/173 (2013.01); G02B 15/20 (2013.01); G02B 15/22 (2013.01); G02B 15/24 (2013.01); H04N 5/23296 (2013.01);
Abstract
A zoom lens system includes a positive first lens group, a negative second lens group, and positive third and fourth lens groups, in that order from the object side. Upon zooming from the short to long focal length extremities, the first lens group does not move along the optical axis direction, and the second lens group and the third lens group are movable in the optical axis direction. The first lens group includes at least one negative lens element, and the following conditions are satisfied:ν1<22.85and−8.0<3/2<−3.0,wherein