Patent ID: 7218459
Filing Date: 2007-05-15
Classification: G02B

Abstract:
1. A zoom lens assembly, comprising: a first and second lens sets each defined with at least one internal barrel and a corresponding lens group disposed within said internal barrel wherein one of the internal barrels disposed with the lens group is accommodated within the other internal barrel disposed with another lens group; a lens holder accommodating the first and second lens sets therein; and an alignment element for keeping the lens groups of the lens sets coaxial, including: a mating structure formed between the two internal barrels to function coupled precisely; a sliding device having at least a fastening device capable of interconnecting the mating structure of the two lens sets to a guiding groove formed on the lens holder, thereby facilitating slide of the lens sets within the lens holder; and a part contour of each of the two internal barrels and a corresponding inner sidewall formed on the lens holder, both which are coupled closely; wherein the lens groups are divided into a first and second lens groups, the internal barrels are divided into a first and second internal barrels each having a step-shaped barrel body with different internal diameters and external diameters, and the first and second internal barrels each include a body portion with a first external diameter, and an outer sidewall defined on the body portion is shaped for coupling precisely between the internal barrel and the corresponding inner sidewall of the lens holder.