| US 7,532,412 B2 | ||
| Zoom lens having image stabilizing function | ||
| Takahiro Hatada, Utsunomiya (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Feb. 27, 2008, as Appl. No. 12/38,669. | ||
| Claims priority of application No. 2007-051331 (JP), filed on Mar. 01, 2007. | ||
| Prior Publication US 2008/0212206 A1, Sep. 04, 2008 | ||
| Int. Cl. G02B 15/14 (2006.01) | ||
| U.S. Cl. 359—688 [359/686; 359/676; 359/557] | 10 Claims |
| 1. A zoom lens comprising, in order from an object side to an image side:
a first lens unit having positive refractive power;
a second lens unit having negative refractive power; and
a rear lens group including at least one lens unit having positive refractive power,
wherein the rear lens group includes a lens unit IS having negative refractive power which is movable in a direction having
a component perpendicular to an optical axis so as to displace an imaging position, and a lens unit R_IS having positive refractive
power and arranged on the image side of the lens unit IS,
the distance between the lens unit IS and the lens unit R_IS being variable during zooming, and wherein
the following conditions are satisfied:
0.05<|fIS/fT|<0.18
2.0<f1/fR—IS<4.5
where fIS is a focal length of the lens unit IS, fT is a focal length of the entire zoom lens at a telephoto end, f1 is a focal length of the first lens unit, and fR_IS is a focal length of the lens unit R_IS.
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