Patent ID: 7142371
Filing Date: 2006-11-28
Classification: G03B

Abstract:
1. A zoom lens comprising, in order from an object side thereof, a first lens group having negative refracting power, a second lens group having positive refracting power and a third lens group having positive refracting power, wherein: for zooming from a wide-angle end to a telephoto end of the zoom lens, the second lens group moves only toward the object side and the third lens group moves in a locus different from that of the second lens group while a spacing between adjacent lens groups varies, the first lens group is made up of two lens elements, a negative lens element including an aspheric surface and a positive lens element, the second lens group comprises two lens components, an object side-lens component and an image side-lens component, one of which consists of a doublet component consisting of a positive lens element and a negative lens element and the other of which consists of a positive single lens component, wherein said object side-lens component has an aspheric surface at an object side-surface thereof, the third lens group consists of one lens component having positive refracting power, and the second lens group satisfies the following condition (1) with respect to the object side-lens component:  where R