Patent Number: 
Section: claims

1. An apparatus for driving a plate-like driven mass, comprising:a drive unit;a wobble bearing to convert a rotary motion of the drive unit into a linear motion of the driven mass; anda plate-like compensatory mass disposed parallel to the plate-like driven mass, the compensatory mass mechanically coupled with the wobble bearing so as to move linearly contrary to a linear motion of the plate-like driven mass during operation of the drive unit. 2. The apparatus of claim 1, wherein the plate-like driven mass is a scattered radiation grid of a diagnostic X-ray system. 3. The apparatus of claim 1, wherein the compensatory mass is connected to the wobble bearing via a thrust rod and at least one decoupling element which converts the tumbling motion exerted by the wobble bearing into the contrary linear motion. 4. The apparatus of claim 3, wherein the thrust rod is connected by a second end to a guide carriage secured to the compensatory mass. 5. The apparatus of claim 4, further comprising a bearing element, supported on one side in the guide carriage and connected on the other side to the thrust rod for permitting a linear compensatory motion. 6. The apparatus of claim 5, wherein the linear compensatory motion is perpendicular to the linear motion of the compensatory mass. 7. The apparatus of claim 5, wherein the thrust rod is connected by the second end to the guide carriage via a second joint head. 8. The apparatus of claim 7, wherein the trust rod is supported in the bearing element. 9. The apparatus of claim 4, further comprising a bearing housing in which the thrust rod is supported in sliding fashion and which is secured to a frame component or housing component. 10. The apparatus of claim 3, further comprising a bearing housing in which the thrust rod is supported in sliding fashion and which is secured to a frame component or housing component. 11. The apparatus of claim 3 further comprising a retaining element secured to the wobble bearing, and having a connection part to receive a first end of the thrust rod. 12. The apparatus of claim 3, wherein the wobble bearing is connected to the driven mass via a coupling element, and the thrust rod extends along a side of the coupling element. 13. The apparatus of claim 12, wherein the coupling element is a peg. 14. The apparatus of claim 12, wherein a first end of the thrust rod is connected to the wobble bearing in a diametrically opposite configuration to the coupling element. 15. The apparatus of claim 14, further comprising a retaining element secured to the wobble bearing, and having a connection part to receive a first end of the thrust rod. 16. The apparatus of claim 15, wherein the retaining element is clamped to the wobble bearing. 17. The apparatus of claim 15, wherein the thrust rod is supported in the connection part via a first joint head. 18. The apparatus of claim 17, wherein the first joint head is one decoupling element of a plurality of decoupling elements configured for converting a tumbling motion into the linear motion. 19. A diagnostic radiology system having an apparatus for driving a scattered radiation grid, the apparatus comprising:a drive unit;a wobble bearing to convert and transmit a rotary motion of the drive unit into a linear motion of the scattered radiation grid, anda compensatory mass disposed generally in parallel to the scattered radiation grid, the compensatory mass being mechanically connected with the wobble bearing so as to execute during operation of the drive unit a linear motion that is contrary to a linear motion of the scattered radiation grid. 20. The diagnostic radiology system of claim 19, wherein the compensatory mass is connected to the wobble bearing via a thrust rod and at least one decoupling element which converts the tumbling motion exerted by the wobble bearing into the contrary linear motion.