Patent ID: 6520691
Filing Date: 2003-02-18
Classification: G02B

Abstract:
A lens barrier opening/closing device of a movable lens barrel driven to move between an accommodation position and a photographing position, comprising:at least one barrier blade which is driven to open and close a photographic aperture formed at the front end wall of said movable lens barrel when said movable lens barrel is in said photographing position and said accommodation position, respectively; a barrier drive ring driven to rotate about an optical axis to drive said at least one barrier blade; a first biasing device which biases said barrier drive ring in a predetermined rotational direction; a rotational barrel which at least rotates about said optical axis when said movable lens barrel moves between said accommodation position and said photographing position; a rotational-force receiving surface formed on said barrier drive ring, said rotational force receiving surface extending parallel to said optical axis; and a rotational-force transmission surface formed on said rotational barrel, said rotational-force transmission surface extending parallel to said optical axis, wherein said rotational-force receiving surface and said rotational-force transmission surface are engaged with each other to rotate said barrier drive ring together with said rotational barrel about said optical axis in a direction against a biasing force of said first biasing device when said movable lens barrel moves from one of said photographing position and said accommodation position to the other of said photographing position and said accommodation position.