Aperture shield incorporating refractory materials

Details Aperture shield incorporating refractory materials Aperture shield incorporating refractory materials

2011-08-16

2011-08-16

Thomas, Courtney (Department: 2882)

X-ray or gamma ray systems or devices

Source

Electron tube

C378S141000, C378S121000

Reexamination Certificate

active

08000450

ABSTRACT:
An x-ray tube electron shield is disclosed for interposition between an electron emitter and an anode configured to receive the emitted electrons. The electron shield is configured to withstand the elevated levels of heat produced by electrons backscattered from the anode and incident on the electron shield. This in turn equates to a reduced incidence of failure in the electron shield. In one embodiment the electron shield includes a body that defines a bowl-shaped aperture having a narrowed throat segment. The body of the electron shield includes a first body portion, a second body portion, and a disk portion. These portions cooperate to define the bowl and the throat segment. The throat segment and the lower portion of the bowl are composed of a refractory material and correspond with the regions of the electron shield that are impacted by relatively more backscattered electrons from the anode surface.

REFERENCES:
patent: 6075839 (2000-06-01), Treseder
patent: 6115454 (2000-09-01), Andrews et al.
patent: 6215852 (2001-04-01), Rogers et al.
patent: 6400799 (2002-06-01), Andrews
patent: 6519317 (2003-02-01), Richardson et al.
patent: 6619318 (2003-09-01), Dalhart et al.
patent: 7410296 (2008-08-01), Rogers
patent: 2005/0201519 (2005-09-01), Bathe et al.

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