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:
Dec. 15, 2015
Filed:
Dec. 20, 2013
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 15/177 (2006.01); G02B 15/14 (2006.01); G02B 27/64 (2006.01);
U.S. Cl.
CPC ...
G02B 15/177 (2013.01); G02B 15/14 (2013.01); G02B 27/646 (2013.01);
Abstract
A zoom lens system includes a negative first lens group, a positive second lens group, a negative third lens group, and a positive fourth lens group. Upon zooming from the short to the long focal length extremities, the distance between the first and second lens groups decreases, the distance between the second and third lens groups increases, and the distance between the third and fourth lens groups decreases. The following conditions (1) and (2) are satisfied:−2.50<1/2<−1.57  (1),and3/3<−0.1  (2),wherein