A field emission type cathode, as well as x-ray tube with a field emission cathode

摘要

The present invention relates to a field emission cathode that a field emitter (9, 29) and an extraction grid (10, 43), wherein the field emitter (9, 29) and the extraction grid (10, 43) are movable relative to each other. Such a field emission cathode is higher loads and has a higher service life. The present invention also relates to an x-ray tube (1, 21) with a field emission cathode that a field emitter (9, 29) and an extraction grid (10, 43), wherein the field emitter (9, 29) and the extraction grid (10, 43) are movable relative to each other. Such an x-ray tube (1, 21) is higher loads and has a higher service life.