| 摘要 |
PROBLEM TO BE SOLVED: To provide a zoom lens which is compact due to a simple structure and is large in zoom ratio and is high performance. SOLUTION: The zoom lens comprises a first lens group G1 having a fixed distance from the image plane side and negative refracting power, a second lens group G2 having positive refracting power and moving during zooming, a third lens group G3 having positive refracting power and moving during zooming, and a fourth lens group G4 having a fixed distance from the image plane side and positive refracting power. The first, the second, the third and the fourth lens groups G1-G4 are arranged in order from the object side to the image plane side. The third lens group G3 includes an aperture stop (s), a lens 13 having positive refracting power and a lens 14 having negative refracting power, which are arranged in order from the object side to the image plane side. COPYRIGHT: (C)2007,JPO&INPIT
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