Title:
【発明の名称】内部窓遮蔽を有するX線管
Document Type and Number:
Japanese Patent JP2000504483
Kind Code:
A
Abstract:
The filament for the emission of the electrons in an X-ray tube inevitably evaporates gradually during operation of the tube. Depending on the location of the filament in the tube, the metal vapor thus released is deposited on the X-ray window of the tube. Consequently, the transmission of the X-ray tube window gradually decreases in the course of the service life of the tube. In order to counteract the deposition of filament material, an edge structure is provided on the inner side of the window; this structure comprises edges which extend perpendicularly to the window surface, and is preferably a honeycomb structure with hexagonal cells. The height of the edges is chosen so that, viewed from the filament, the edge structure forms a shadow zone for the entire X-ray window, so that the metal vapor is deposited on the structure instead of on the window.
Inventors:
Van der Borst, Johannus
Stork, Johann Wilm
Stork, Johann Wilm
Application Number:
JP52540098A
Publication Date:
April 11, 2000
Filing Date:
November 17, 1997
Export Citation:
Assignee:
Konin Krekka Philips Electronics NV
International Classes:
H01J35/06; H01J35/02; H01J35/18; (IPC1-7): H01J35/18; H01J35/06
Attorney, Agent or Firm:
Tadahiko Ito (1 outside)