| 摘要 |
PROBLEM TO BE SOLVED: To provide a zoom lens which achieves the miniaturization and has a variable power ratio of about three times, and to provide an image pickup device that has the same. SOLUTION: The zoom lens ZL includes, in order from an object side, a first lens group Gr1 having negative power, a second lens group Gr2 having negative power, and a third lens group Gr3 having positive power. The position of the first lens group Gr1 is fixed during zooming, and the third lens group Gr3 includes three lenses which are, in order from the object side, a single lens having positive power, a single lens having negative power and a single lens having positive power. If the three single lenses composing the third lens groups Gr3 are, in order from the object side, a third-first lens G31, a third-second lens G32 and a third-third lens G33, the zoom lens satisfies the following conditional expression: 0.35<L3/f3<1.5 (where L3 represents the axial air gap distance between the third-second lens G32 and the third-third lens G33 and f3 represents the focal length of the third lens group Gr3). COPYRIGHT: (C)2009,JPO&INPIT |
