ZOOM LENS

WIPO Patent Application WO/2023/160594

A1

A zoom lens. The zoom lens comprises a first lens group (10) having negative focal power and a second lens group (20) having positive focal power which are sequentially arranged from an object side to an image side along an optical axis. The focal length of the zoom lens is changed by changing positions of the first lens group (10) and the second lens group (20) on the optical axis; the first lens group (10) comprises a first lens (101), a second lens (102), and a third lens (103) which are sequentially arranged from the object side to the image side along the optical axis; and the second lens group (20) comprises a fourth lens (201), a fifth lens (202), a sixth lens (203), and a seventh lens (204) which are sequentially arranged from the object side to the image side along the optical axis. The first lens (101) has negative focal power, the second lens (102) has negative focal power, the third lens (103) has positive focal power, the fourth lens (201) has positive focal power, the fifth lens (202) has positive focal power, the sixth lens (203) has negative focal power, and the seventh lens (204) has positive focal power.

JPS58144808	FOCUSING SYSTEM OF ZOOM LENS
JP2001281549	OPTICAL SYSTEM OF REAL IMAGE TYPE FINDER
JP2003270518	AUTOFOCUS SYSTEM

LIU ZHENGRONG (CN)
ZHANG LEI (CN)
ZHANG ZHANJUN (CN)

PCT/CN2023/077773

August 31, 2023

February 23, 2023

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DONGGUAN YUTONG OPTICAL TECH CO LTD (CN)

G02B15/14; G02B15/16

CN216927244U	2022-07-08
JP2008310133A	2008-12-25
US20170045720A1	2017-02-16
CN110262021A	2019-09-20
CN102262291A	2011-11-30
CN104181683A	2014-12-03
CN111856699A	2020-10-30
JP2009204699A	2009-09-10
US5963379A	1999-10-05

BEYOND ATTORNEYS AT LAW (CN)

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