ZOOM LENS AND OPTICAL DEVICE HAVING THE SAME - ZHEJIANG DAHUA TECHNOLOGY CO

Title:

ZOOM LENS AND OPTICAL DEVICE HAVING THE SAME

Document Type and Number:

WIPO Patent Application WO/2020/063249

Kind Code:

A1

Abstract:

Provided are a zoom lens and optical devices using the same. The zoom lens may include in order from an object side to an image side: a first lens group (G1); a second lens group (G2); a third lens group (G3); a fourth lens group (G4); and a fifth lens group (G5); wherein the zoom lens satisfies the following conditions: -1.7≤f 2/f w '≤-0.3, 0.7≤f 3/f w '≤2.1, 1.1≤f 4/f w '≤2.5, and TTL/f w '≤6.5, wherein f 2 denotes a focal length of the second lens group, f 3 denotes a focal length of the third lens group, f 4 denotes a focal length of the fourth lens group, f w ' denotes a focal length of the zoom lens, and TTL denotes a total track length of the zoom lens.

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Inventors:

LIU KAI (CN)
LIN FAGUAN (CN)
DING HONGXING (CN)

Application Number:

PCT/CN2019/103483

Publication Date:

April 02, 2020

Filing Date:

August 30, 2019

Export Citation:

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Assignee:

ZHEJIANG DAHUA TECHNOLOGY CO (CN)

International Classes:

G02B15/177

Foreign References:

CN109116531A	2019-01-01
US20110080650A1	2011-04-07
US20130100335A1	2013-04-25
US6327100B1	2001-12-04
US20120099208A1	2012-04-26
US20110249172A1	2011-10-13
US20100033836A1	2010-02-11

Other References: