Patent ID: 8520319

Claim:
A zoom lens barrel assembly comprising: a first zoom ring for supporting a first lens group and comprising a first protrusion protruding outward; a guide ring comprising a first guide slot extending in an axial direction, through which the first protrusion passes, and a second guide slot extending in a circumferential direction, and disposed around the first zoom ring; a second zoom ring for supporting a second lens group, comprising a third protrusion protruding outward, and movably disposed in the axial direction with respect to the first zoom ring; a first cylinder comprising a second zoom ring guide groove formed in an inner wall surface of the first cylinder into which the third protrusion is inserted and a second protrusion protruding outward so as to pass through the second guide slot, and disposed between the first zoom ring and the second zoom ring so as to rotate and move in the axial direction; a second cylinder comprising a fourth protrusion protruding outward, rotatably disposed around the guide ring, comprising a first groove portion into which the first protrusion passing through the first guide slot is inserted, and a second groove portion into which the second protrusion passing through the second guide slot is inserted, and movably supporting the first zoom ring and the first cylinder; and an external cylinder comprising a third groove portion into which the fourth protrusion is inserted, and disposed around the second cylinder to rotatably support the second cylinder.