Patent ID: 8059953
Filing Date: 2011-11-15
Classification: G02B,G03B

Abstract:
1. A zoom lens comprising: a zoom optical system including movable lens groups for zooming which are moved between a ready-to-photograph position, in a zooming range, and an accommodated position behind said ready-to-photograph position in an optical axis direction; a diaphragm mechanism; and a lens shutter, wherein one of the movable lens groups serves as an aperture-control lens group, wherein one and the other of the diaphragm mechanism and the lens shutter are positioned in front of and behind the aperture-control lens group in the optical axis direction and are movable relative to the aperture-control lens group in the optical axis direction, wherein the diaphragm and the lens shutter are moved to positions close to the aperture-control lens group when the movable lens groups are moved to the accommodated position, and wherein apertures of both the diaphragm mechanism and of the lens shutter are opened to allow the aperture-control lens group to partly enter said apertures when the diaphragm mechanism and the lens shutter are moved to the positions close to the aperture-control lens group.