Title:
WIDE-ANGLE LENS
Document Type and Number:
WIPO Patent Application WO/2018/021205
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a wide-angle lens capable of reducing the incidence angle relative to an imaging plane, and reducing astigmatism and chromatic aberration of magnification in the vicinity of the aberration. A wide-angle lens 100 includes seven lenses and has a diaphragm 80 between a fourth lens 40 and a fifth lens 50. A first lens 10 is a negative meniscus lens with the convex surface facing an object. A second lens 20 is a negative meniscus lens with at least one aspherical surface and the concave surface facing an image. A third lens 30 is a negative meniscus lens with at least one aspherical surface and the concave surface facing the object. A fourth lens 40 and a fifth lens 50 are positive lenses. A sixth lens 60 is a negative lens with the concave surface facing the image. A seventh lens 70 is a biconvex lens with the convex surfaces facing both the object and the image and constitutes a cemented lens 90 with the sixth lens 60.
Inventors:
KOMIYAMA TADASHI (JP)
Application Number:
PCT/JP2017/026594
Publication Date:
February 01, 2018
Filing Date:
July 24, 2017
Export Citation:
Assignee:
NIDEC SANKYO CORP (JP)
International Classes:
G02B13/04; G02B13/18
Foreign References:
| JP2011107425A | 2011-06-02 | |||
| JP2007164079A | 2007-06-28 | |||
| JPH04246606A | 1992-09-02 | |||
| JPH04267212A | 1992-09-22 | |||
| US20150205070A1 | 2015-07-23 | |||
| JP2015034922A | 2015-02-19 |
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