X-ray image intensifier
AssigneeSiemens Aktiengesellschaft
InventorPeter Wulff
Life of this patent
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Abstract
An X-ray image intensifier which includes a metal-ceramic bulb or tube, whose metal components are vacuum-tightly soldered to each other under the interposition of the electrically insulating ceramic. Through the weak conductivity of the surface of the ceramic portion there is achieved a potential distribution which, in the neighborhood of the solder, still so extensively conforms to the solder where no potential dropoff will be present and thereby also no reason for the producing of a peak discharge. The potential varies significantly only over longer distances.
Claims4
In an x-ray image intensifier having a vacuum-tight metal-ceramic tube including an interposed electrically insulating ceramic component (4), an electrically weakly conductive layer (17) covering the surface of said ceramic component (4) at least on the side facing interiorly of said tube, the tube having first and second concentric metal cylinders (1, 10), the first metal cylinder (1) having an end thereof butt-soldered to the ceramic component (4) and the second metal cylinder (10) being located inside said first metal cylinder (1) and inside of the ceramic component (4), said ceramic component (4) being joined to said first metal cylinder (1) along a juncture line, and a raised bead (15) located on the ceramic component (4) along the juncture line of said first metal cylinder (1) with said ceramic component (4) and between said first and second metal cylinders (1, 10).
In an X-ray image intensifier having a metal-ceramic tube, the metal components of said tube being vacuum-tightly soldered to each other under the interposition of an electrically insulating ceramic component, the improvement comprising:
- an electrically weakly conductive layer covering the surface of said ceramic component at least on the side facing interiorly of said tube, said layer comprising a glaze constituted of a basic glaze and a coloring body, said layer comprising a mixture of a basic glaze constituted of about 67.9% silica (SiO.sub.2), 18.7% aluminum oxide (Al.sub.2 O.sub.3), 0.2 iron oxide (Fe.sub.2 O.sub.3), 0.5 magnesium oxide (MgO), 5.0% calcium oxide (CaO), 6.1% potassium oxide (K.sub.2 O), and 1.6% sodium oxide (Na.sub.2 O);
- and including 15 to 30% additive of a dark-colored coloring body relative to the quantity of said basic glaze.
Dependencies are inferred from the claim text.