(19)
(11) EP 1 429 587 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
published in accordance with Art. 158(3) EPC

(48) Corrigendum issued on:
08.09.2004 Bulletin 2004/37

(43) Date of publication:
16.06.2004 Bulletin 2004/25

(21) Application number: 02765365.8

(22) Date of filing: 29.08.2002
(51) International Patent Classification (IPC)7: H05G 1/00, H05G 1/70
(86) International application number:
PCT/JP2002/008700
(87) International publication number:
WO 2003/019995 (06.03.2003 Gazette 2003/10)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR

(30) Priority: 29.08.2001 JP 2001259088

(71) Applicant: KABUSHIKI KAISHA TOSHIBA
Kawasaki-shi, Kanagawa 212-8572 (JP)

(72) Inventor:
  • SHIMONO, Takashi
    Kuroiso-shi, Tochigi 325-0032 (JP)

(74) Representative: Henkel, Feiler & Hänzel 
Möhlstrasse 37
81675 München
81675 München (DE)

   


(54) X-RAY GENERATOR


(57) An X-ray generator comprises a cathode electrode (15), a grid electrode (17) for controlling an electron beam (e) generated by the cathode electrode (15), a focus electrode (18) for focusing the electron beam (e), and an anode target (14) for emitting X rays by the collision of the electron beam (e). A bias voltage (Vb) is impressed between the cathode electrode (15) and the grid electrode (17) from a bias voltage generating section (20). A tube voltage (Vt) is impressed on the anode target (13) from a tube voltage generating section (19). A voltage dividing section (31) divides the tube voltage (Vt) to generate a focus voltage (Vf). The effect of a variation in voltage on the formation of a focal point of the electron beam is suppressed by impressing such a focus voltage (Vf) on the focus electrode (18).