ZOOM LENS SYSTEM AND IMAGING DEVICE

Title:

ZOOM LENS SYSTEM AND IMAGING DEVICE

Document Type and Number:

WIPO Patent Application WO/2006/095543

Kind Code:

A1

Abstract:

A zoom lens system used for an imaging device for a fixed-lens camera etc. The zoom lens system includes at least the following lens groups sequentially arranged from the object side: a 1st lens group (GR1) with positive refractive power, a 2nd lens group (GR2) with negative refractive power, a 3rd lens group (GR3) with positive refractive power, a 4th lens group (GR4) with negative refractive power, a 5th lens group (GR5) with positive refractive power, and a 6th lens group (GR6) with negative refractive power. Magnification is varied by varying the intervals between the lens groups. The zoom lens system satisfies the following expressions of (1), (2), (3), (4), and (5): (1) DW(1 - 2) < DT(1 - 2) (2) DW(2 - 3) > DT(2 - 3) (3) DW(3 - 4) > DT(3 - 4) (4) DW(4 - 5) < DT(4 - 5) (5) DW(5 - 6) < DT(5 - 6) Where, in the above, DW(i - j) is the distance between an i-th lens group and a j-th lens group at the wide angle end in infinity shooting and DT(i - j) is the distance between the i-th lens group and the j-th lens group at the tele end in infinity shooting, and focusing is made when the 4th lens group (GR4) is moved in the optical axis direction.

Inventors:

KURODA DAISUKE (JP)
SUEYOSHI MASAFUMI (JP)
WATANABE KAZUYA (JP)

Application Number:

PCT/JP2006/302662

Publication Date:

September 14, 2006

Filing Date:

February 15, 2006

Export Citation:

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Assignee:

SONY CORP (JP)
TAMRON KK (JP)
KURODA DAISUKE (JP)
SUEYOSHI MASAFUMI (JP)
WATANABE KAZUYA (JP)

International Classes:

G02B15/20; G02B13/18

Foreign References:

JPH09243912A	1997-09-19
JPH0777656A	1995-03-20
JPH11174325A	1999-07-02
JPH04146407A	1992-05-20
JP2001350093A	2001-12-21
JP2005068901A	2005-03-17
JPH04146407A	1992-05-20
JP2001350093A	2001-12-21

Other References: