| 摘要 |
PROBLEM TO BE SOLVED: To obtain a zoom lens having a vibration-proof function capable of preventing the occurrence of eccentric aberration when sensing vibrations, maintaining excellent optical performance even during vibrations, and facilitating miniaturization of a driving mechanism for vibration isolation. SOLUTION: The zoom lens has a variable power group comprising a plurality of lens groups including a variable power lens group, and an imaging group including a plurality of lens groups immovable when zooming and having positive refractive power as a whole. The imaging group has lens constitution including a lens group having positive refractive power and a lens group having negative refractive power. Image displacement is performed by the lens group having negative refractive power, and the lens group having negative refractive power comprises a positive lens and a negative lens. The surface of the lens group having negative refractive power nearest to an object side is concave, and at least one surface of the lens group having negative refractive power is aspherical. Focal length fn of the lens group having negative refractive power and focal length fp of the lens group having positive refractive power are set appropriately. COPYRIGHT: (C)2009,JPO&INPIT
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