DRIVING GEAR OF SIGNAL PROCESSING DEVICE

PURPOSE: To lessen dimensions, such as a height of a driver by mooring a metallic element to a bearing supporting member to conductively connect the two components, while abutting the metal element against a driving shaft by pressure. CONSTITUTION: In a bearing supporting tube 11, there are two rolling bearings 14, 15 which are separated from each other by a radial projection 13. A driving shaft 16 is supported by these bearings 14, 15. The distance between the centers of the bearings 14, 15 is nearly the same as the diameter of the shaft 16. In a ring-shaped recess 17 of the projection 13, a spring (metallic element) 18 is fastened. The spring 18 is extended spirally toward the center from the ring- shaped recess 17, and its free end 19 is slidably in contact with the shaft 16. Thereby the shaft 16 is connected to the bearing supporting tube 11, depending on the potential of the shaft 16 and the undesired increase in potential of the shaft 16 can be prevented. By this method, the dimensions such as the height of a driver can be made as small as possible, while maintaining the output.