Title:
ZOOM LENS SYSTEM, IMAGING DEVICE AND CAMERA
Document Type and Number:
WIPO Patent Application WO/2010/001547
Kind Code:
A1
Abstract:
Provided are a zoom lens system which has a high resolution and a short optical total length (total length of lenses), fully supports a wide-angle shot with an angle of view at the wide-angle end of 70° or more, and has a large aperture with an F number at the wide-angle end of approximately 2.0, an imaging device, and a camera. The zoom lens system comprises, in order from the object side to the image side, a first lens group having negative power, a second lens group having positive power, a third lens group having positive power, and a fourth lens group having positive power. In zooming, the distances between the respective lens groups change. The third lens group comprises multiple lens elements. The zoom lens system satisfies a condition (|-1): 0.47<|f31/fG3|<1.00 (where fT/fW>2.0, f31 is the focal length of a lens element closest to the object side of the third lens group, fG3 is the focal length of the third lens group, fT is the focal length of the entire system at the telephoto end, and fW is the focal length of the entire system at the wide-angle end).
Inventors:
IIYAMA, Tomoko (())
飯山智子 (())
飯山智子 (())
Application Number:
JP2009/002858
Publication Date:
January 07, 2010
Filing Date:
June 23, 2009
Export Citation:
Assignee:
PANASONIC CORPORATION (1006, Oaza Kadoma Kadoma-sh, Osaka 01, 〒5718501, JP)
パナソニック株式会社 (〒01 大阪府門真市大字門真１００６ Osaka, 〒5718501, JP)
IIYAMA, Tomoko (())
パナソニック株式会社 (〒01 大阪府門真市大字門真１００６ Osaka, 〒5718501, JP)
IIYAMA, Tomoko (())
International Classes:
G02B15/20; H04N5/225; G02B13/18
Attorney, Agent or Firm:
OGASAWARA, Shiro (Daido-Seimei Esaka Bldg, 13th Floor 1-23-101, Esakacho, Suita-sh, Osaka 63, 〒5640063, JP)
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