The present invention relates to a base (640) of the drive member (24, 24 ') for driving the movable element (15', 15 ") and a base (640) of the drive member (24, 24 '). Three actuators (610, 620) for controlling the base (640) of the drive member (24, 24 ') in three mutually orthogonal movement directions (X, Y, Z) by means of the two connections (612, 622, 632). , 630), and the motion transmission chain, wherein the intermediate surfaces of the three connections (612, 622, 632) intersect in the central region of the base (640) of the drive member (24, 24 ') Concerning the chain.本発明は、可動要素(15’,15’’)を駆動するための駆動部材(24,24’)の基部(640)と;駆動部材(24,24’)の基部(640)との3つの接続部(612,622,632)によって、3つの互いに直交する運動方向(X,Y,Z)において駆動部材(24,24’)の基部(640)を制御する3つのアクチュエータ(610,620,630)と;を備える運動伝達チェーンにおいて、3つの接続部(612,622,632)の中間面が、駆動部材(24,24’)の基部(640)の中央領域で交差する、運動伝達チェーンに関する。