| 摘要 |
PROBLEM TO BE SOLVED: To provide a small and high performance imaging lens with less aberration variation. SOLUTION: The imaging lens 1 includes at least a positive lens group G1, a negative lens group G2 that moves during focusing, a positive lens group G3 that moves during focusing, a negative lens group G4 that moves in a direction substantially vertical to an optical axis, and a positive lens group G5, which are disposed in order from an object along the optical axis. The following conditional expression is satisfied: 2.0<(-f4)/d34<20.8, where f4 is a focal length of the negative lens group G4 (vibration proof group) that moves in a direction substantially vertical to the optical axis, and d34 is an air distance on the optical axis at infinity focus, between a lens surface L33 disposed closest to an image of a lens group (the positive lens group G3) which is disposed to an object side of the negative lens group G4 that moves in a direction substantially vertical to the optical axis, and a lens surface L41 disposed closest to the object of the negative lens group that moves in a direction substantially vertical to the optical axis. COPYRIGHT: (C)2009,JPO&INPIT
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