Title:
ZOOM LENS
Document Type and Number:
WIPO Patent Application WO/2016/019823
Kind Code:
A1
Abstract:
A zoom lens comprises 20 pieces of lens made of glass and a diaphragm, wherein the surfaces of the lens are spherical surfaces. A front fixed group (01) with a positive focal power, a zooming group (02) with a negative focal power, a compensating group (03) with a positive focal power, and a rear fixing group (04) with a positive focal power are formed along the light incidence direction sequentially. Through reasonable arranging each element and selecting a proper material, the requirements of optical indicators of 50 times zooming ratio under focal distance of 750mm to 15mm and long focal distance of 350mm are achieved, and this zoom lens can be used for confocal imaging in a visible light wave band and a near infrared wave band, so as to apply in a day-and-night monitoring system.
Inventors:
WANG YUANPENG (CN)
YANG CHUN (CN)
YANG CHUN (CN)
Application Number:
PCT/CN2015/085579
Publication Date:
February 11, 2016
Filing Date:
July 30, 2015
Export Citation:
Assignee:
QINGDAO GOERTEK TECHNOLOGY CO LTD (CN)
International Classes:
G02B15/173
Foreign References:
| CN104199178A | 2014-12-10 | |||
| CN204129320U | 2015-01-28 | |||
| US20080291546A1 | 2008-11-27 | |||
| US6282032B1 | 2001-08-28 | |||
| US5757554A | 1998-05-26 |
Other References:
See also references of EP 3112914A4
Attorney, Agent or Firm:
BEIJING LONGAN LAW FIRM (CN)
北京市隆安律师事务所 (CN)
北京市隆安律师事务所 (CN)
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