Title:
ZOOM LENS AND OPTICAL DEVICE WITH THE SAME
Document Type and Number:
WIPO Patent Application WO/2007/129677
Kind Code:
A1
Abstract:
A zoom lens capable of image shifting, suitable for an optical device having a
limited space for placing a zoom lens, small-sized and simple, and having excellent
focusing performance. An optical device having the zoom lens is also provided.
The zoom lens is made up of, in sequence from the object side along the optical
axis, a first lens group (G1) having a light path bending optical element and having
positive refractive power, a second lens group (G2) having negative refractive
power, a third lens group (G3) having positive refractive power, and a fourth
lens group (G4) having positive refractive power. When the focal length varies
from a wide angle end state (W) to a tele end state (T), the first lens group (G1)
and the third lens group (G3) are fixed relative to an image surface (I), the second
lens group (G2) and the fourth lens group (G4) move along the optical axis, and
the entire third lens group (G3) or a part of it is shifted in the direction substantially
perpendicular to the optical axis as a shift lens group. This shifts an image
on the image surface (I). The first lens group (G1) includes a negative lens,
and the zoom lens satisfies predetermined conditions.
Inventors:
TAKE TOSHINORI (JP)
Application Number:
PCT/JP2007/059419
Publication Date:
November 15, 2007
Filing Date:
April 25, 2007
Export Citation:
Assignee:
NIKON CORP (JP)
TAKE TOSHINORI (JP)
TAKE TOSHINORI (JP)
International Classes:
G02B7/10; G02B15/16; G02B13/18; G03B17/17
Foreign References:
| JP2005352347A | 2005-12-22 | |||
| JP2005321545A | 2005-11-17 | |||
| JP2003302576A | 2003-10-24 | |||
| JP2004264585A | 2004-09-24 |
Other References:
See also references of EP 2015122A4
Attorney, Agent or Firm:
INOUE, Yoshio (1-4 Nihonbashi 3-chome, Chuo-k, Tokyo 27, JP)
Download PDF: