Title:
ZOOM LENS
Document Type and Number:
WIPO Patent Application WO/2012/066735
Kind Code:
A1
Abstract:
[Problem] To increase compactness while suppressing the occurrence of aberration across the entire zoom range in a zoom lens comprising three lens groups. [Solution] The zoom lens is formed by disposing, in order from the object side, a first lens group (G1) having a negative refractive power, a second lens group (G2) having a positive refractive power, and a third lens group (G3) having a positive refractive power, has an aperture (St) moved in unison with the second lens group (G2), and varies in power by altering the gap between the first lens group (G1) and the second lens group (G2) and the gap between the second lens group (G2) and the third lens group (G3). The second lens group (G2) is formed by disposing, in order from the object side: the first lens (L21) that is of the second group and that has a positive refractive power, having a convex surface facing the object side; a doublet lens (Lc) having a positive refractive power overall; and the fourth lens (L24) that is of the second group and that has a negative refractive power, having at least one aspheric surface and having a concave surface facing the image side.
Inventors:
ORI TETSUYA (JP)
Application Number:
PCT/JP2011/006139
Publication Date:
May 24, 2012
Filing Date:
November 02, 2011
Export Citation:
Assignee:
FUJIFILM CORP (JP)
ORI TETSUYA (JP)
ORI TETSUYA (JP)
International Classes:
G02B15/20; G02B13/18
Foreign References:
| JP2002072091A | 2002-03-12 | |||
| JP2007114727A | 2007-05-10 | |||
| JP2001141997A | 2001-05-25 | |||
| JP2002072093A | 2002-03-12 |
Attorney, Agent or Firm:
YANAGIDA, Masashi et al. (JP)
Seiji Yanagida (JP)
Seiji Yanagida (JP)
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Claims:
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