Title:
WIDE ANGLE LENS
Document Type and Number:
WIPO Patent Application WO/2018/110526
Kind Code:
A1
Abstract:
This wide angle lens (100) appropriately corrects chromatic aberration by raising the positional accuracy of a third lens (30) and a fourth lens (40) which are disposed on the object side with respect to an aperture (81). More specifically, the wide angle lens (100) has a five-group and seven-sheet configuration, wherein, on the image side with respect to the aperture (81), a fifth lens (50) comprising a positive lens and a second cemented lens (120) comprising a sixth lens (60), and a seventh lens (70) are disposed. On the object side with respect to the aperture (81), the third lens (30) and the fourth lens (40) constitute a first cemented lens (110). In the first cemented lens (100), an end section (465), which comprises the inner circumferential surface of a recess section (462) provided on the fourth lens (40), contacts the outer circumferential surface (365) of a protrusion section (362) of a flange part (36) of the third lens (30), thereby defining positions.
Inventors:
KOMIYAMA TADASHI (JP)
Application Number:
PCT/JP2017/044492
Publication Date:
June 21, 2018
Filing Date:
December 12, 2017
Export Citation:
Assignee:
NIDEC SANKYO CORP (JP)
International Classes:
G02B13/04; G02B13/18
Foreign References:
| JPH04267212A | 1992-09-22 | |||
| JP2015036779A | 2015-02-23 | |||
| KR20120089532A | 2012-08-13 | |||
| US20140211009A1 | 2014-07-31 | |||
| JP2008134494A | 2008-06-12 |
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