Device for controlling the movement of a figure on a display screen by means of the movement of optically coupled barriers by the movement of a roller ball

摘要

It consists of a manually actuated roller ball 1 and three lateral supporting wheels together with another lower one, the side ones 2 and 3 being used to move the optically coupled barriers 5 and 6. The third lateral wheel 4 is used as an element to press the ball against the wheels 2 and 3. The point of support of the lower supporting wheel is displaced with respect to the vertical axis of the ball 1. On the supporting shaft of the lateral wheel 4 is fitted a support piece 14 for the ball made from self- lubricating plastic material such as nylon. <IMAGE>