Title:
IMAGING LENS SYSTEM
Document Type and Number:
WIPO Patent Application WO/2018/142960
Kind Code:
A1
Abstract:
Provided is an imaging lens system that allows stable optical properties to be obtained when glass lenses and plastic are arranged appropriately. A lens unit 150 has an imaging lens system 100 having a lens configuration comprising seven lenses in six groups inside a lens holder 90. The imaging lens system 100 comprises a first lens L1, a second lens L2, a third lens L3, a diaphragm 50, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7 that are arranged in this order from an object side La. The fifth lens L5 is a glass lens, while the second lens L2, the third lens L3, the fourth lens L4, the sixth lens L6, and the seventh lens L7 are plastic lenses. The sixth lens L6 and the seventh lens L7 form a cemented lens L8. The third lens L3 and the fourth lens L4 are positioned with flange portions L30, L40 thereof being in contact with the holder 90.
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Inventors:
KOMIYAMA TADASHI (JP)
KANZAKI YOSUKE (JP)
KANZAKI YOSUKE (JP)
Application Number:
PCT/JP2018/001486
Publication Date:
August 09, 2018
Filing Date:
January 19, 2018
Export Citation:
Assignee:
NIDEC SANKYO CORP (JP)
International Classes:
G02B13/04; G02B13/18
Foreign References:
| JPS61126515A | 1986-06-14 | |||
| JPH09304694A | 1997-11-28 |
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