Title:
ZOOM LENS AND IMAGING DEVICE
Document Type and Number:
WIPO Patent Application WO/2012/176437
Kind Code:
A1
Abstract:
[Problem] To provide a zoom lens having a high variable power ratio while enabling a reduction in size and an increase in performance. [Solution] A zoom lens comprising, in order from the object side, a positive first lens group (1G), a negative second lens group (2G), a positive third lens group (3G), a positive fourth lens group (4G), and a negative fifth lens group (5G). When zooming from the wide angle end to the telephoto end, the clearance (δ12) between the first lens group (1G) and second lens group (2G) is always increased, the clearance (δ23) between the second lens group (2G) and third lens group (3G) is always decreased, the clearance (δ34) between the third lens group (3G) and fourth lens group (4G) is always decreased, the clearance (δ45) between the fourth lens group (4G) and the fifth lens group (5G) is changed, and all of the lens groups are displaced relative to the imaging position. When the point of focus is shifted from the infinity side to the near side and focused, only the fifth lens group (5G) is shifted from the object side to towards the image side, and the fifth lens group (5G) has at least one negative lens and at least one positive lens.
Inventors:
TANAKA TAKASHI (JP)
CHO MICHIO (JP)
CHO MICHIO (JP)
Application Number:
PCT/JP2012/003987
Publication Date:
December 27, 2012
Filing Date:
June 19, 2012
Export Citation:
Assignee:
FUJIFILM CORP (JP)
TANAKA TAKASHI (JP)
CHO MICHIO (JP)
TANAKA TAKASHI (JP)
CHO MICHIO (JP)
International Classes:
G02B15/20; G02B13/18
Foreign References:
| JP2011090190A | 2011-05-06 | |||
| JPH10206736A | 1998-08-07 | |||
| JPH09197271A | 1997-07-31 | |||
| JPH1164728A | 1999-03-05 | |||
| JPH0470707A | 1992-03-05 |
Attorney, Agent or Firm:
YANAGIDA, Masashi et al. (JP)
Seiji Yanagida (JP)
Seiji Yanagida (JP)
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Claims: