Patent ID: 8896934

Claim:
A zoom lens barrel assembly, comprising: a first zoom ring configured to support a first lens group; a first guide ring, on an outer side of which the first zoom ring is disposed, cam-connected to the first zoom ring to cause the first lens group to move linearly along an optical axis direction by rotation; a second zoom ring configured to support a second lens group and cam-connected to the first guide ring to move linearly along the optical axis direction; a second guide ring cam-connected to the first guide ring and configured to move linearly along the optical axis direction to rotate the first guide ring; a cylinder configured to move linearly along the optical axis direction together with the second zoom ring while being rotated; and an external cylinder comprising a third lens group, wherein the third lens group is positioned on an inner side of the external cylinder and on an optical axis together with the first and second lens groups, and the external cylinder is cam-connected to the cylinder to cause the cylinder to rotate, wherein an auxiliary cam projection of the first guide ring coupled to an auxiliary cam groove of the first zoom ring is inserted into the auxiliary cam groove of the first zoom ring, before a cam projection of the first zoom ring coupled to a cam groove of the first guide ring is deviated from the cam groove.