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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.:

US 9915811 B1

PDFFull Text
Expired
Date of Patent:
Mar. 13, 2018

Filed:

Oct. 27, 2014

Zoom lens system having first, second, and fourth lens groups which move during zooming

Applicant:

Ricoh Imaging Company, Ltd., Tokyo, JP;

Inventor:

Tatsuyuki Onozaki, Tokyo, JP;

Assignee:

RICOH IMAGING COMPANY, LTD., Tokyo, JP;

Attorney:

Greenblum & Bernstein, P.L.C.

Primary Examiner:

Stephone B Allen

Assistant Examiner:

Ryan S Dunning

Int. Cl.
CPC ...
G02B 15/177 (2006.01); G02B 13/00 (2006.01); G02B 27/64 (2006.01); G02B 15/14 (2006.01); G02B 15/16 (2006.01); G02B 15/167 (2006.01); G02B 15/163 (2006.01);
U.S. Cl.
CPC ...
G02B 15/177 (2013.01); G02B 27/646 (2013.01); G02B 15/14 (2013.01); G02B 15/16 (2013.01); G02B 15/163 (2013.01); G02B 15/167 (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, in that order from the object side. Upon zooming from the short to long focal length extremities, at least the first lens group, the second lens group and the fourth lens group are moved in the optical axis direction. The third lens group includes a negative first sub-lens group and a negative second sub-lens group, in that order from the object side. The second sub-lens group is provided with a negative single lens element and a positive single lens element, wherein an air lens is formed between the negative single lens element and the positive single lens element.

Find Patent Forward Citations

Onozaki, Tatsuyuki. (2018). Zoom lens system having first, second, and fourth lens groups which move during zooming (U.S. Patent No. 9915811). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/9915811

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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