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Patent Searching and Data


Title:
ZOOM LENS AND IMAGING DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/225842
Kind Code:
A1
Abstract:
Provided is a zoom lens that is small-sized and that has a relatively large zoom ratio. The present invention essentially comprises, in order from the object side, a first lens group Gr1 fixed on an optical axis AX and having a positive refractive power, a second lens group Gr2 having a negative refractive power, a third lens group Gr3 fixed on the optical axis AX and having a positive refractive power, and a fourth lens group Gr4 having a positive refractive power, magnification being varied by changing the interval between lens groups, the first lens group Gr1 having at least five lenses, and a positive lens in the first lens group Gr1 satisfying the conditional expression νave > 85, where νave is the average value of the Abbe number.

Inventors:
IZUMI, Ryotaro (Inc. 2-7-2 Marunouchi, Chiyoda-k, Tokyo 15, 〒1007015, JP)
Application Number:
JP2018/021951
Publication Date:
December 13, 2018
Filing Date:
June 07, 2018
Export Citation:
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Assignee:
KONICA MINOLTA, INC. (2-7-2 Marunouchi, Chiyoda-ku Tokyo, 15, 〒1007015, JP)
International Classes:
G02B15/16; G02B13/18
Foreign References:
JP2016099549A2016-05-30
JP2017062318A2017-03-30
JP2003098434A2003-04-03
JP2016080975A2016-05-16
JP2011081110A2011-04-21
US20140036117A12014-02-06
Attorney, Agent or Firm:
FUKUDA, Mitsuhiro (Kotani Bldg. 1F, 5-3 Uchikanda 2-chome Chiyoda-ku Tokyo, 47, 〒1010047, JP)
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