(19)
(11) EP 1 675 152 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
21.05.2008 Bulletin 2008/21

(43) Date of publication A2:
28.06.2006 Bulletin 2006/26

(21) Application number: 05027757.3

(22) Date of filing: 19.12.2005
(51) International Patent Classification (IPC): 
H01J 35/10(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK YU

(30) Priority: 21.12.2004 JP 2004369816

(71) Applicant: Rigaku Corporation
Akishima-shi, Tokyo 196-8666 (JP)

(72) Inventors:
  • Sakata, Masataka Rigaku Corporation
    Akishima-shi Tokyo 196-8666 (JP)
  • Chaki, Tomohiro
    Akishima-shi Tokyo 196-8666 (JP)
  • Kuribayashi, Masaru
    Akishima-shi Tokyo 196-8666 (JP)

(74) Representative: Wagner, Karl H. 
WAGNER & GEYER Patentanwälte Gewürzmühlstrasse 5
80538 München
80538 München (DE)

   


(54) Rotating anode x-ray tube


(57) A rotating anode (10) has an improved separator (52) arranged within a coolant passage (50) which is formed inside the rotating anode. A cylindrical target has an outer periphery whose axial length (L3) is in a range between 20 and 100 millimeters. The separator (52) has a proximal surface (82), a distance (G) between the proximal surface (82) and a must-cooled surface (92) being in a range between 0.1 and 3.0 millimeters. The axial length (L2) of the proximal surface (82) is not greater than five millimeters. Thus, since the axial length (L2) of the proximal surface (82) is set to be small, the load of a rotary driving source would be not so large even with a high-speed rotation of the rotating anode (10). When using an electric motor as the rotary driving source, it is not necessary to exchange the capacity of a motor diver for a larger one.







Search report