Search International and National Patent Collections

1. (WO2009127995) X-RAY TUBE WITH PASSIVE ION COLLECTING ELECTRODE

Pub. No.:    WO/2009/127995    International Application No.:    PCT/IB2009/051455
Publication Date: Oct 22, 2009 International Filing Date: Apr 7, 2009
IPC: H01J 35/16
Applicants: PHILIPS INTELLECTUAL PROPERTY & STANDARDS GMBH
KONINKLIJKE PHILIPS ELECTRONICS N.V.
BEHLING, Rolf, K. O.
HAUTTMANN, Stefan
Inventors: BEHLING, Rolf, K. O.
HAUTTMANN, Stefan
Title: X-RAY TUBE WITH PASSIVE ION COLLECTING ELECTRODE
Abstract:
An X-ray tube (1) comprising a cathode (3), an anode (5) and a further electrode (7) is proposed. Therein, the further electrode is arranged and adapted such that, due to impact of 'free electrons (27) coming from the anode (5), the further electrode (7) negatively charges to an electrical potential lying between a cathode's potential and an anode's potential. The further electrode (7) may be passive, i.e. substantially electrically isolated and not connected to an active external voltage supply. The further electrode (7) may act as an ion pump removing ions from within a primary electron beam (21) and furthermore also removing atoms of residual gas within the housing (11) of the X-ray tube (1). In order to further increase the ion pumping capability of the further electrode (7), a magnetic field generator (61) can be arranged adjacent to the further electrode (7).