Title:
ZOOM LENS AND IMAGING DEVICE
Document Type and Number:
WIPO Patent Application WO/2013/031188
Kind Code:
A1
Abstract:
[Problem] To reduce the F value and satisfactorily correct distortion aberrations and other aberrations, in a zoom lens having a two-lens configuration. [Solution] A zoom lens: having a first lens group (G1) having negative refractive power and a second lens group (G2) having a positive refractive power, arranged in order from the object side; that changes magnification by moving the first lens group (G1) and the second lens group (G2); and wherein the first lens group (G1) is configured by four lenses (L11, L12, L13, L14) and the object-side surface of the second lens (L12) in the first lens group (G1) is a concave surface on the object side in the paraxial region. The zoom lens fulfills the following formula, when the paraxial radius of curvature on the object-side surface of the second lens (L12) is rG12F and the paraxial radius of curvature on the image-side surface is rG12R: 2.0<(rG12F+rG12R)/(rG12F-rG12R)<30.0 … (1-1)
Inventors:
SAITO HIROKI (JP)
CHO MICHIO (JP)
ITO TORU (JP)
CHO MICHIO (JP)
ITO TORU (JP)
Application Number:
PCT/JP2012/005383
Publication Date:
March 07, 2013
Filing Date:
August 28, 2012
Export Citation:
Assignee:
FUJIFILM CORP (JP)
SAITO HIROKI (JP)
CHO MICHIO (JP)
ITO TORU (JP)
SAITO HIROKI (JP)
CHO MICHIO (JP)
ITO TORU (JP)
International Classes:
G02B15/16; G02B13/18
Foreign References:
| JP2011107269A | 2011-06-02 | |||
| JP2011107267A | 2011-06-02 | |||
| JP2008026750A | 2008-02-07 |
Attorney, Agent or Firm:
YANAGIDA, Masashi et al. (JP)
Seiji Yanagida (JP)
Seiji Yanagida (JP)
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Claims: