Patent ID: 7184228
Filing Date: 2007-02-27
Classification: G02B

Abstract:
1. A lens body tube comprising: a main tube; at least one lens configured movable along the optical axis direction of the lens body tube in the main tube; a first ring configured to be rotated for a zooming operation, the first ring being disposed around the outer circumference of the main tube; a second ring configured to be rotated for a focusing operation, the second ring being disposed around the outer circumference of the main tube; a third ring configured to be rotated by the first ring, the third ring being disposed inside the main tube; a fourth ring configured to be translated along the optical axis direction by rotation of the third ring, the fourth ring being disposed inside the main tube; a fifth ring configured to be rotated by the second ring; and at least one lens frame, of the at least one lens, supported by the fifth ring, wherein the fifth ring is screwed together with the fourth ring.