Patent ID: 7304804

Claim:
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, wherein the plurality of lens units includes, from an object side: a first lens unit; a second lens unit; and a third lens unit; 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: 0.1< T≦w/fw< 1.5 and 3.1≦ ft/fw≦ 5.5 where T 23 w is an axial distance between the second lens unit and the third lens unit in the shortest focal length condition, fw is the focal length of the zoom lens system in the shortest focal length condition, and ft is the focal length of the zoom lens system in the longest focal length condition.