LENS SYSTEM AND IMAGING DEVICE - ZHEJIANG DAHUA TECHNOLOGY CO

Title:

LENS SYSTEM AND IMAGING DEVICE

Document Type and Number:

WIPO Patent Application WO/2019/057070

Kind Code:

A1

Abstract:

The present disclosure is related to a lens system (200). Lens system (200) includes, in order from an object side to an image side, a first lens group (G1) having negative refractive power, a second lens group (G2) having positive refractive power, a third lens group (G3) having positive refractive power, and the lens system (200) satisfies the following condition: a≤f1/f'≤b, c≤f2/f'≤d, e≤f3/f'≤f, and at least partial of third lens group (G3) is made of material satisfying the following condition: Vd>g and dn/dt≤h, wherein a, b, c, d, e, f, g and h are constants, f1 represents a focal length of first lens group (G1), f2 represents a focal length of second lens group (G2), f3 represents a focal length of third lens group (G3), f'represents a focal length of the lens system (200), Vd represents an abbe constant, n represents a refractive index, t represents temperature, and dn/dt represents a differential of refractive indices against temperature.

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Inventors:

LIU KAI (CN)
PAN WENQIANG (CN)
DING HONGXING (CN)

Application Number:

PCT/CN2018/106455

Publication Date:

March 28, 2019

Filing Date:

September 19, 2018

Export Citation:

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Assignee:

ZHEJIANG DAHUA TECHNOLOGY CO (CN)

International Classes:

G02B13/06

Foreign References:

CN107678147A	2018-02-09
US20120307374A1	2012-12-06
CN106324798A	2017-01-11
CN105629443A	2016-06-01
CN103048773A	2013-04-17
CN104407431A	2015-03-11
CN106291887A	2017-01-04
JP2005283648A	2005-10-13

Other References: