公开(公告)号：US09728370B2

公开(公告)日：2017-08-08

申请号：US14610981

申请日：2015-01-30

Applicant: VAREX IMAGING CORPORATION

Inventor： Paul D. Moore ,  Kasey Otho Greenland

IPC: H01J35/14 ,  H01J35/06 ,  H01J3/14 ,  H01J35/26

CPC classification number: H01J35/14 ,  H01J3/14 ,  H01J35/06 ,  H01J35/26

Abstract: An example embodiment includes a cathode assembly. The cathode assembly includes a cathode head, a filament, a focusing structure, and a non-rectilinear focusing aperture. The cathode head defines a filament slot. The filament is positioned in the filament slot that is capable of emitting electrons by thermionic emission. The focusing structure is positioned at least partially between the filament and an anode. The non-rectilinear focusing aperture is defined in the focusing structure. The non-rectilinear focusing aperture is configured to shape an emission profile of electrons emitted by the filament.