Patent ID: 7692862
Filing Date: 2010-04-06
Classification: G02B

Abstract:
1. A zoom lens capable of image stabilization comprising: in order from an object side of the zoom lens: a first lens group having a positive refractive power, the first lens group being fixed when the zoom lens varies a magnification thereof; a second lens group having a negative refractive power and being capable of varying a magnification of the zoom lens; a stop; a third lens group having a positive refractive power, the third lens group being fixed when the zoom lens varies a magnification thereof; and a fourth lens group having a positive refractive power, being capable of correcting an image plane variation when the zoom lens varies a magnification thereof, and being capable of focusing the zoom lens, wherein the third lens group includes a 3a-th lens group having a positive refractive power, a 3b-th lens group having a negative refractive power, and a 3c-th lens group having a positive refractive power in this order from the object side, the 3b-th lens group is adapted to be movable in a direction approximately orthogonal to an optical axis thereof so as to correct blurring of a taken image which is caused by a vibration of the zoom lens, and the zoom lens satisfies conditional expressions (1) and (2): wherein fw represents a focal length of the zoom lens at a wide angle end, f3 represents a focal length of the third lens group, φ3a represents a refractive power of the 3a-th lens group, which is a reciprocal of a focal length of the 3a-th lens group, φ3b represents a refractive power of the 3b-th lens group, which is reciprocal of a focal length of the 3b-th lens group, and φ3c represents a refractive power of the 3c-th lens group, which is reciprocal of a focal length of the 3c-th lens group.