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Patent Searching and Data


Title:
ZOOM LENS AND OPTICAL DEVICE HAVING SAME
Document Type and Number:
WIPO Patent Application WO/2008/105248
Kind Code:
A1
Abstract:
It is an object to provide a zoom lens with a small size and an excellent optical performance, configured to satisfactorily correct a color aberration in a far distance photographing region. In the following order from the object side, the zoom lens is provided with a plurality of lens groups including a first lens group (G1) with a positive refractive index, a second lens group (G2) with a negative refractive index, a third lens group (G3), and a fourth lens group (G4). When a variable magnification from a wide angle end state to a telescopic end state is carried out, a gap between the first lens group and the second lens group increases, a gap between the second lens group and the third lens group decreases, the lens group closest to the image side in the plurality of the lens groups moves along the optical axis with a convex locus, so that the zoom lens satisfies a predetermined condition.

Inventors:
SATO, Susumu (C/O NIKON CORPORATION, 2-3 Marunouchi 3-chome, Chiyoda-k, Tokyo 31, 1008331, JP)
Application Number:
JP2008/052587
Publication Date:
September 04, 2008
Filing Date:
February 08, 2008
Export Citation:
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Assignee:
NIKON CORPORATION (2-3 Marunouchi 3-chome, Chiyoda-ku Tokyo, 31, 1008331, JP)
株式会社ニコン (〒31 東京都千代田区丸の内3丁目2番3号 Tokyo, 1008331, JP)
International Classes:
G02B15/16; G02B13/18; G03B5/00; G03B17/02; G02B15/20
Attorney, Agent or Firm:
INOUE, Yoshio (3F Garoh Bldg, 1-4 Nihonbashi 3-chome,Chuo-ku, Tokyo 27, 1030027, JP)
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