Patent ID: 7055971

Claim:
In a lens shift mechanism for shifting a projection lens for projecting a video in a direction perpendicular to its optical axis, a lens shift mechanism wherein a first movable base moving in a vertical direction (lengthwise) and a second movable base moving in a horizontal direction (crosswise) are provided in an overlapped manner on a fixed base, each of the movable bases has an aperture for video light passage, and a projection lens is carried on either one of the movable bases, and comprising a movement range limiting structure for limiting the moving range of the movable base having the projection lens carried thereon such that the moving range in the horizontal direction (crosswise) in a state where the projection lens is positioned on the upper or lower side is narrower than the moving range in the horizontal direction (crosswise) in a state where the projection lens is positioned at the center and limiting the moving range of the movable base having the projection lens carried thereon such that the moving range in the vertical direction (lengthwise) in a state where the projection lens is positioned on the right or left side is narrower than the moving range in the vertical direction (lengthwise) in a state where the projection lens is positioned at the center.