Abstract: A flat emitter is disclosed. In an embodiment, the flat emitter includes an emitter surface, which upon application of a heating voltage, emits electrons; a first end area, which has a first support rod; and a second end area, which has a second support rod. At least one first support rod has a narrow section extending in a longitudinal direction and is bonded to the first end area or a second support rod, which has a narrow section extending in a longitudinal direction and is bonded to the second end area. A flat emitter of this kind is structurally simple and offers a high level of electron emission at the same time as a longer useful life.

Abstract: A rotary bulb tube of an x-ray radiator is mounted for rotation in a housing, which is filled with a coolant and is connected to a shaft section, which in turn is connected by a coupling to a second shaft section extending to a motor for rotating the bulb tube. The coupling is designed to isolate the rotary bulb tube electrically from the motor and to isolate the bulb tube from motor vibrations.