GB715669A - Improvements in and relating to methods of obtaining vacuum tightness in x-ray tubes - Google Patents

Abstract

715,669. X-ray tubes. GENERAL ELECTRIC CO. Sept. 29, 1952 [Sept. 28, 1951], No. 24343/52. Class 39(1) [Also in Group XXII] In an X-ray tube anode in which the anode body 21 has a thin-walled portion 21<SP>1</SP> separating a cooling chamber 23 from the target button 22, the wall 21<SP>1</SP> has embedded within it a cup-shaped insert of dense material such as molybdenum. This enables the wall 21<SP>1</SP> of the anode body, which is of cast metal such as copper, to be made thinner than otherwise; the total thickness of target, copper wall, and molybdenum in the example described is # inch or less, the target button accounting for <SP>1</SP>/ 16 inch of this. Figs. 3 and 5 (not shown) illustrate different arrangements of baffles for directing the flow of fluid in the cooling chamber. In the modified arrangement of Fig. 7 (not shown), the electrons impinge normally on the target, and a method of manufacturing this form is shown in Fig. 6. The tungsten target button 22 is placed flat on a graphite plate 49, and anchored in position by pins 50 fitting into holes 51 in the plate. Above this is placed the insert 25, similarly anchored by pins 52 fitting into holes 53. Insert 25 is thus spaced from target 22 by the thickness of the horizontal bent portions of pins 50. The main anode body of copper is now cast over this structure, preferably under vacuum, so that copper flows between the target and the insert 25, thus embedding the latter; the graphite plate 49 is then removed, leaving the completed anode. The form shown in Fig. 2, with a cup-shaped insert, may be made by a similar method.