04344011 is referenced by 125 patents and cites 5 patents.

In an X-ray tube comprising a cathode electrode including a filament for emitting electrons and a focusing electrode having a focusing groove adapted to contain the filament, and an anode electrode opposing the cathode electrode and maintained at a high potential which is positive relative to the filament, an electron emitting region of the filament facing the anode electrode is formed as a substantially flat surface, and the filament, the focusing electrode and the anode electrode are arranged such that a portion of the anode electrode upon which electron collide will be positioned in a focal plane of a cathode lens formed by the filament, the focusing electrode and the anode electrode.

Title
X-ray tubes
Application Number
6/93268
Publication Number
4344011
Application Date
November 13, 1979
Publication Date
August 10, 1982
Inventor
Setsuo Nomura
Tokyo
JP
Tadashi Hayashi
Mobara
JP
Agent
Charles E Pfund
Assignee
Hitachi
JP
IPC
H01J 29/46
H01J 35/00
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