公开(公告)号：US20190189384A1

公开(公告)日：2019-06-20

申请号：US15845046

申请日：2017-12-18

Applicant: VAREX IMAGING CORPORATION

Inventor： Colton B. Woodman ,  Christopher M. Lewis

IPC: H01J35/04 ,  H01J35/06 ,  H05G1/30 ,  H01J35/10 ,  H05G1/02

CPC classification number: H01J35/045 ,  H01J35/06 ,  H01J35/101 ,  H01J2201/304 ,  H05G1/02 ,  H05G1/30

Abstract: A bipolar grid may be positioned between a cathode and an anode. The bipolar grid may receive a positive grid voltage that corresponds to a voltage in an electric field between the cathode and the anode such that the grid does not interfere with an electron beam generated by an electron emitter of the cathode. The bipolar grid may receive a negative grid voltage to isolate the electron emitter such that the electron beam does not reach the anode.