公开(公告)号：US20170082841A1

公开(公告)日：2017-03-23

申请号：US15364590

申请日：2016-11-30

Applicant: TAMRON CO., LTD.

Inventor： Yoshito lwasawa ,  Jun Takahashi

IPC: G02B15/173 ,  G02B5/00 ,  G02B27/00 ,  G02B27/64

CPC classification number: G02B15/173 ,  G02B5/005 ,  G02B27/0025 ,  G02B27/646

Abstract: A zoom lens has in order from the object side, at least a foremost, first lens group having positive refractive power, a succeeding, second lens group having negative refractive power, a third lens group having positive refractive power, and a rearmost lens group having negative refractive power. The zoom lens meets requirements as defined in formulas regarding a displacement of the first lens group, a focal length of the zoom lens at the wide-angle end, a focal length of the zoom lens at the telephoto end, a focal length of the first lens group, and a focal length of the third lens group.