Patent ID: 7116758

Claim:
A Potter-Bucky device for being positioned in a radiation image recording apparatus for exposing an image recording medium to radiation which has passed in a first plane through an object to the recording medium in order to record a radiation image of the object on the recording medium, comprising: a grid movably supported for reciprocating motion in a second plane extending parallel to the recording medium between the object and the recording medium, wherein the grid is movable along an axis lying in the second plane; at least one movable cam positioned adjacent the grid and causing reciprocating movement of the grid along the axis in the second plane parallel to the recording medium upon movement of the cam; and a counter-weight movably supported and operatively connected to the grid for reciprocating motion in the second plane along the axis in directions opposite the grid, wherein displacement of the center of gravity of the Potter-Bucky device due to movement of the grid is compensated for by the movement and mass of the counter-weight so as to prevent substantial vibration being transmitted from such movement to the radiation image recording apparatus.