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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 10634874 B1

PDFFull Text
Date of Patent:
Apr. 28, 2020

Filed:

Aug. 20, 2018

Zoom lens and imaging apparatus

Applicant:

Fujifilm Corporation, Tokyo, JP;

Inventor:

Yasutaka Shimada, Saitama, JP;

Assignee:

FUJIFILM Corporation, Tokyo, JP;

Attorney:

Studebaker & Brackett PC

Primary Examiner:

Evelyn A Lester

Int. Cl.
CPC ...
G02B 15/14 (2006.01); G02B 9/60 (2006.01); G02B 27/00 (2006.01); G02B 13/06 (2006.01); G02B 13/02 (2006.01); G02B 15/17 (2006.01); G02B 15/20 (2006.01); G02B 15/16 (2006.01); G02B 15/167 (2006.01); G02B 13/00 (2006.01); G02B 15/24 (2006.01); G02B 13/18 (2006.01); G02B 5/00 (2006.01);
U.S. Cl.
CPC ...
G02B 9/60 (2013.01); G02B 13/02 (2013.01); G02B 13/06 (2013.01); G02B 15/17 (2013.01); G02B 27/0037 (2013.01); G02B 5/005 (2013.01); G02B 13/009 (2013.01); G02B 13/0045 (2013.01); G02B 13/18 (2013.01); G02B 15/14 (2013.01); G02B 15/16 (2013.01); G02B 15/167 (2013.01); G02B 15/20 (2013.01); G02B 15/24 (2013.01);
Abstract

The zoom lens consists of, in order from an object side, a first lens group having a positive power, a second lens group having a negative power, a third lens group having a negative power, a stop, a fourth lens group having a positive power, and a fifth lens group having a positive power. During zooming, the first lens group and the fifth lens group remain stationary, and the other lens groups and the stop move. The most image side positive lens is disposed to be closest to the image side in the first lens group. The following conditional expression relating to a partial dispersion ratio θgF1p of the most image side positive lens between the g line and the F line and an Abbe number ν1p is satisfied: 0.6376<θgF1p+0.0017×ν1p<0.7.

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