Title:
ZOOM LENS AND IMAGING DEVICE
Document Type and Number:
WIPO Patent Application WO/2013/099210
Kind Code:
A1
Abstract:
[Problem] To provide a high-performance zoom lens which has a high variable-power ratio of over 12, is small-sized, and has a long back focus. [Solution] In order from the object side are: a positive refractive power first lens group (G1), a negative refractive power second lens group (G2), a positive refractive power third lens group (G3), and a positive refractive power fourth lens group (G4). When the power is varied from the wide-angle end to the telephoto end, each lens group moves such that the interval between the first lens group (G1) and the second lens group (G2) increases, the interval between the second lens group (G2) and the third lens group (G3) decreases, and the interval between the third lens group (G3) and the fourth lens group (G4) decreases. The fourth lens group (G4) is formed from, in order from the object side, a positive refractive power 4a lens group (G4a) and a negative refractive power 4b lens group (G4b), and only the 4b lens group (G4b) moves to the image side during focusing from infinity to close-up.
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Inventors:
TANAKA TAKASHI (JP)
CHO MICHIO (JP)
CHO MICHIO (JP)
Application Number:
PCT/JP2012/008256
Publication Date:
July 04, 2013
Filing Date:
December 25, 2012
Export Citation:
Assignee:
FUJIFILM CORP (JP)
International Classes:
G02B15/20; G02B13/18; G03B5/00
Foreign References:
JPS5778514A | 1982-05-17 | |||
JPS58137812A | 1983-08-16 | |||
JPH095629A | 1997-01-10 | |||
JP2001111872A | 2001-04-20 | |||
JP2000275523A | 2000-10-06 | |||
JPH0496012A | 1992-03-27 | |||
JPS63294506A | 1988-12-01 | |||
JP2010169983A | 2010-08-05 | |||
JPH0933808A | 1997-02-07 | |||
JPH0311314A | 1991-01-18 | |||
JPS6278523A | 1987-04-10 | |||
JPH01185608A | 1989-07-25 | |||
JP2010145759A | 2010-07-01 |
Attorney, Agent or Firm:
YANAGIDA, Masashi et al. (JP)
Seiji Yanagida (JP)
Seiji Yanagida (JP)
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Claims:
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