Title:
ZOOM LENS SYSTEM, OPTICAL DEVICE WITH SAME, AND MAGNIFICATION CHANGING METHOD USING ZOOM LENS SYSTEM
Document Type and Number:
WIPO Patent Application WO/2010/018838
Kind Code:
A1
Abstract:
A zoom lens system (ZL) mounted in an electronic still camera (1) comprises a first lens group (G1) having a negative refractive power and also comprises a second lens group (G2) having a positive refractive power, with the first and second lens groups arranged in that order from the object side. The second lens group (G2) has at least two cemented lenses each having a positive lens on the object side and a negative lens on the image side. Because the distance between the first lens group and the second lens group changes when the magnification is changed from a wide angle end state to a telescope end state, the zoom lens system has excellent optical performance. An optical device equipped with the zoom lens system and a magnification changing method using a zoom lens system are also provided.
Inventors:
MURATANI MAMI (JP)
SATO HARUO (JP)
SATO HARUO (JP)
Application Number:
PCT/JP2009/064210
Publication Date:
February 18, 2010
Filing Date:
August 05, 2009
Export Citation:
Assignee:
NIKON CORP (JP)
MURATANI MAMI (JP)
SATO HARUO (JP)
MURATANI MAMI (JP)
SATO HARUO (JP)
International Classes:
G02B15/16; G02B13/18; G02B15/163
Foreign References:
| JPH04218013A | 1992-08-07 | |||
| JP2001042218A | 2001-02-16 | |||
| JPH08334694A | 1996-12-17 |
Attorney, Agent or Firm:
INOUE, Yoshio (1-4 Nihonbashi 3-chome, Chuo-k, Tokyo 27, JP)
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