Title:
WIDE-ANGLE LENS
Document Type and Number:
WIPO Patent Application WO/2020/262488
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a wide-angle lens capable of obtaining appropriate negative power even if the thickness of a first lens is increased in order to increase strength against impact. A wide-angle lens 100 comprises a front group 110, a diaphragm 80, and a rear group 120. The wide-angle lens satisfies conditional expression (1): 1.500 ≤ T1/f0 ≤ 2.000 where T1 (mm) is the central thickness in the optical axis direction of a first lens 10, and f0 (mm) is the focal length of the entire lens system. Accordingly, the breakage of the first lens 10 by impact can be suppressed. Also, appropriate negative power can be prevented from not being obtained because the first lens 10 becomes too thick.
Inventors:
KANZAKI YOSUKE (JP)
Application Number:
PCT/JP2020/024900
Publication Date:
December 30, 2020
Filing Date:
June 24, 2020
Export Citation:
Assignee:
NIDEC SANKYO CORP (JP)
International Classes:
G02B13/04; G02B13/18
Foreign References:
| JP2007279632A | 2007-10-25 | |||
| JP2007071979A | 2007-03-22 | |||
| JP2015190999A | 2015-11-02 | |||
| JP2013073156A | 2013-04-22 |
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