Patent ID: 7042650
Filing Date: 2006-05-09
Classification: G02B

Abstract:
1. A zoom lens device comprising: a zoom lens system having a plurality of lens units; and an image sensor converting an optical image formed by the zoom lens system, into electric image data, the zoom lens system comprising, from the object side: a first lens unit disposed on the most object side and consisting of a single negative lens element; and a second lens unit being overall positive power and including a positive lens element and a negative lens element independent of each other, wherein lens surfaces constituting the zoom lens system are all refracting surfaces, wherein zooming is performed by varying the distances between the lens units, and wherein following conditions are satisfied: where Fnt is the minimum f-number of the zoom lens system in the longest focal length condition, fw is the focal length of the zoom lens system in the shortest focal length condition, ft is the focal length of the zoom lens system in the longest focal length condition, and T23w is the axial distance between the second lens unit and the adjoining lens unit on the image side in the shortest focal length condition.