US 12,230,468 B2
X-ray system with field emitters and arc protection
Dave Kirkham, South Jordan, UT (US); and Colton B. Woodman, Magna, UT (US)
Assigned to Varex Imaging Corporation, Salt Lake City, UT (US)
Filed by Varex Imaging Corporation, Salt Lake City, UT (US)
Filed on Jun. 30, 2022, as Appl. No. 17/855,739.
Prior Publication US 2024/0006144 A1, Jan. 4, 2024
Int. Cl. H01J 35/06 (2006.01); H01J 35/08 (2006.01); H01J 35/14 (2006.01)
CPC H01J 35/065 (2013.01) [H01J 35/112 (2019.05); H01J 35/147 (2019.05)] 20 Claims
OG exemplary drawing
 
1. An x-ray tube, comprising:
a field emitter including an emission surface;
an anode; and
a focus electrode disposed between the field emitter and the anode;
wherein:
the focus electrode includes:
a first surface that is substantially perpendicular to the field emitter emission surface and nearest to the field emitter;
a second surface that is axially nearest to the anode, wherein the field emitter and the anode form an axis; and
a third surface that extends between the first surface and the second surface;
a first location on the focus electrode between the first surface and the third surface is further from the anode than a second location on the focus electrode between the third surface and the second surface; and
the focus electrode further comprises a protrusion extending towards the anode.