Title:
WIDE ANGLE LENS AND WIDE ANGLE LENS UNIT
Document Type and Number:
WIPO Patent Application WO/2014/069430
Kind Code:
A1
Abstract:
The present invention provides a wide-angle lens and a wide-angle lens unit capable of minimizing any decrease in resolution accompanying temperature variation capable of reducing chromatic aberration of magnification. Among four lens groups in a wide angle lens (20), a third lens group (13) has positive-power glass lenses, while the other lens groups have plastic lenses. The third lens group (13) is a cemented lens in which glass lenses (23, 24) are cemented. A fourth lens group (14) is a cemented lens in which a positive-power plastic lens (25) and a negative-power plastic lens (26) are cemented together. The plastic lenses (25, 26) are aspheric lenses.
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Inventors:
KOMIYAMA TADASHI (JP)
Application Number:
PCT/JP2013/079199
Publication Date:
May 08, 2014
Filing Date:
October 29, 2013
Export Citation:
Assignee:
NIDEC SANKYO CORP (JP)
International Classes:
G02B13/04
Domestic Patent References:
| WO2012137739A1 | 2012-10-11 |
Foreign References:
| JPH09113799A | 1997-05-02 | |||
| JP2007233152A | 2007-09-13 | |||
| JP2010128100A | 2010-06-10 |
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