ZOOM LENS AND IMAGING DEVICE

Title:

ZOOM LENS AND IMAGING DEVICE

Document Type and Number:

WIPO Patent Application WO/2013/038614

Kind Code:

A1

Abstract:

[Problem] To obtain a zoom lens that is more compact, lighter in weight, less susceptible to fluctuation in the angle of view during focusing, and capable of higher performance. [Solution] A zoom lens (1) comprises, in the stated order from the object side, a positive first lens group (G1) fixed during magnification change, a negative second lens group (G2) that moves to the image side during a magnification change from a wide-angle end to a telephoto end, a negative third lens group (G3) for correcting image plane fluctuations during magnification change, and a positive fourth lens group (G4) fixed during magnification change. The first lens group (G1) comprises a negative first lens group forward group (G1f), a positive first lens group mid-group (G1m), and a positive first lens group rearward group (G1r), in the stated order from the object side. The first lens group forward group (G1f) comprises two negative lenses and a positive lens in the stated order from the object side. Focusing is carried out by moving only the first lens group mid-group (G1m) in the direction of an optical axis. The conditional formula (1) 2.5 < f1/fw < 5.4 is satisfied in regard to the focal length f1 of the first lens group (G1) and the focal length fw of the entire system at the wide-angle end.

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Inventors:

KOMATSU DAIKI (JP)
CHO MICHIO (JP)

Application Number:

PCT/JP2012/005562

Publication Date:

March 21, 2013

Filing Date:

September 03, 2012

Export Citation:

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Assignee:

FUJIFILM CORP (JP)
KOMATSU DAIKI (JP)
CHO MICHIO (JP)

International Classes:

G02B15/167; G02B13/18

Foreign References:

JPH1130749A	1999-02-02
JP2001116993A	2001-04-27
JP2009282202A	2009-12-03
JP2009282201A	2009-12-03
JP2000321496A	2000-11-24
JPH08146293A	1996-06-07
JPH08146294A	1996-06-07
JPH0915501A	1997-01-17
JP2009042346A	2009-02-26

Attorney, Agent or Firm:

YANAGIDA, Masashi et al. (JP)
Seiji Yanagida (JP)

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Claims:

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