Patent ID: 8077408
Filing Date: 2011-12-13
Classification: G02B,G03B

Abstract:
1. A lens mechanism, comprising: a plurality of lens groups each having at least one lens, the plurality of lens groups being located on a photographing optical axis in a photographable state; a telescopic cylinder containing therein the plurality of lens groups in the photographable state; a lens group driving device configured to drive at least one of the plurality of lens groups, at least one of the plurality of lens groups being collapsed to store the plurality of lens groups in a collapsed state and the at least one of the plurality of lens groups being expanded in the photographable state, the plurality of lens groups including at least one retractable lens group configured to be retracted from the photographing optical axis to a retracted position out of the photographing optical axis after being moved toward an image plane side on the photographing optical axis in the collapsed state and configured to be moved from the retracted position to a position on the photographing optical axis in the photographable state; a moving member which moves in a direction along the photographing optical axis, the at least one retractable lens group being moved between the retracted position and a position on the photographing optical axis in accordance with the movement of the moving member in the direction along the photographing optical axis; a position detector configured to detect a change in a position of the moving member; and a retractable lens retaining frame configured to retain the at least one retractable lens group, wherein: the retractable lens retaining frame includes a cam portion, the moving member includes a contact portion configured to have contact with the cam portion, and the cam portion is configured to change a position of the at least one retractable lens group between the retracted position and a position on the photographing optical axis.