Patent ID: 7005774

Claim:
A rotating anode X-ray tube comprising: cathode filament means emitting an electron beam; a rotating anode which receives said electron beam to generate X-rays; a rotary shaft which supports said rotating anode and has an outer surface; a housing which has an inner surface and a space for accommodating said rotary shaft; and a rotary current-collecting device including (i) a slip ring which has an outer peripheral surface and an inner surface fixed to said outer surface of said rotary shaft, (ii) a brush-holding ring which has an outer surface fixed to said inner surface of said housing and an inner surface, (iii) one or more brush-holding springs each of which has a root fixed to said inner surface of said brush-holding ring and a tip end, and (vi) one or more brushes each of which is fixed to said tip end of said brush-holding spring and comes into sliding contact with said outer peripheral surface of said slip ring; wherein at least said outer peripheral surface of said slip ring is made of glassy carbon.