Title:
FOCUS-FIXED LENS AND IMAGING SYSTEM
Document Type and Number:
WIPO Patent Application WO/2019/242324
Kind Code:
A1
Abstract:
Disclosed are a focus-fixed lens and an imaging system. The focus-fixed lens comprises: a first group of lenses and a second group of lenses arranged along an optical axis from an imaging side to an image source side, the two groups of lenses comprising at least seven lenses in total. The first group of lenses are lenses comprised between the imaging side to an aperture. The second group of lenses are lenses comprised between the aperture and the image source side. The first group of lenses comprise at least two lenses, the two lenses being a first lens having negative dioptric power and a second lens having negative dioptric power. The second group of lenses comprise at least three lenses having positive dioptric power. A second surface of the first lens and a second surface of the second lens are both concave to the image source side. The second surface of the first lens and the second surface of the second lens are both the surfaces, of the first lens and the second lens, intersecting with the optical axis and being close to the image source side. The first group of lenses comprise an aspheric lens and the second group of lenses comprise an aspheric lens. By means of the method, the present application can provide a technical support for amplifying a formed image, improving aberrations, and correcting the chromatic aberration.
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Inventors:
SU YUANHONG (CN)
QIU HANMIN (CN)
GUO MINGXU (CN)
WU XILIANG (CN)
QIU HANMIN (CN)
GUO MINGXU (CN)
WU XILIANG (CN)
Application Number:
PCT/CN2019/076613
Publication Date:
December 26, 2019
Filing Date:
March 01, 2019
Export Citation:
Assignee:
APPOTRONICS CORP LTD (CN)
International Classes:
G02B9/64; G02B13/18; G02B11/34; G02B13/00; G03B21/54
Foreign References:
| CN205539670U | 2016-08-31 | |||
| CN206573845U | 2017-10-20 | |||
| CN101114046A | 2008-01-30 | |||
| CN205003348U | 2016-01-27 | |||
| CN106597781A | 2017-04-26 |
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