Patent ID: 7911719

Claim:
A zoom lens, comprising: a plurality of lens groups, wherein when the zoom lens is in operation, the plurality of lens groups are aligned on a common optic axis, and the zoom lens forms a first plane and a second plane conjugated with the first plane, and when retracting the zoom lens, at least one of the lens groups is rotated around an axis perpendicular to the common optical axis and toward the first plane to be off line with the common optical axis, and at least one of the rest of the lens groups is moved toward the second plane along the common optical axis; a seat adjacent to the second plane, comprising a protrusion protruding from the seat toward the first plane, and extending in parallel with the common optical axis; a frame supporting at least one of the lens groups; a rotating shaft movably disposed on the frame and perpendicular to the common optical axis; and a gear set disposed on the rotating shaft and comprising a cam, wherein when retracting the zoom lens, the cam abuts the protrusion to rotate at least one of the lens groups around the rotating shaft toward the first plane.