Uploaded April 2009 | Updated September 2026, 3 weeks ago
This animation illustrates the role of the focusing cup in an X-Ray tube. The animation shows the trajectories of the electrons emitted by the filament both without and with the focusing cup. The focusing cup is held at a negative potential relative to the filament, so that area of impact of the electrons on the anode is a smaller area, creating a smaller spot size. The smaller spot size creates a more point like source for the emitted electrons which in turn provides better quality imaging in diagnostic X-Rays.
This animation illustrates the role of the focusing cup in an X-Ray tube. The animation shows the trajectories of the electrons emitted by the filament both without and with the focusing cup. The focusing cup is held at a negative potential relative to the filament, so that area of impact of the electrons on the anode is a smaller area, creating a smaller spot size. The smaller spot size creates a more point like source for the emitted electrons which in turn provides better quality imaging in diagnostic X-Rays.
