Title:
WIDE-ANGLE LENS
Document Type and Number:
WIPO Patent Application WO/2014/065349
Kind Code:
A1
Abstract:
The invention provides a wide-angle lens capable of improving resolution while lowering cost. A wide-angle lens (20) has a four-group/six-lens configuration. Each of the six lenses has an aspheric plastic lens on the object side and/or the image side. A fourth lens group (14) (first cemented lens) in which aspheric surfaces are cemented together is included in the six lenses. A third lens group (13) (second cemented lens) in which aspheric-surface plastic lenses are cemented together is included on the side opposite the fourth lens group (14), with a diaphragm (91) interposed therebetween. The refractive indices of the cemented plastic lenses are symmetrical between the fourth lens group (14) (first cemented lens) and the third lens group (13) (second cemented lens) with respect to the diaphragm (91).
More Like This:
| JPS61109011 | CONDENSER LENS |
| JP6071473 | A zoom lens and an imaging device using it |
| JP2011141396 | IMAGING LENS, CAMERA MODULE, AND IMAGING APPARATUS |
Inventors:
KOMIYAMA TADASHI (JP)
Application Number:
PCT/JP2013/078763
Publication Date:
May 01, 2014
Filing Date:
October 24, 2013
Export Citation:
Assignee:
NIDEC SANKYO CORP (JP)
International Classes:
G02B13/18; G02B13/04
Domestic Patent References:
| WO2006115107A1 | 2006-11-02 |
Foreign References:
| JPS6236622A | 1987-02-17 | |||
| JPH10111454A | 1998-04-28 | |||
| JP2006284620A | 2006-10-19 | |||
| JP2009092798A | 2009-04-30 | |||
| JPH04267212A | 1992-09-22 | |||
| JP2009063877A | 2009-03-26 | |||
| JP2011017918A | 2011-01-27 | |||
| JP2011150196A | 2011-08-04 | |||
| JP2009063877A | 2009-03-26 | |||
| JP2009036877A | 2009-02-19 |
Other References:
See also references of EP 2913696A4
Download PDF: