US 11,791,123 B2
X-ray tube
Yoon-Ho Song, Daejeon (KR); Jun-Tae Kang, Daejeon (KR); Jae-Woo Kim, Daejeon (KR); and Jin-Woo Jeong, Daejeon (KR)
Assigned to Electronics and Telecommunications Research Institute, Daejeon (KR)
Filed by Electronics and Telecommunications Research Institute, Daejeon (KR)
Filed on Apr. 4, 2022, as Appl. No. 17/712,639.
Claims priority of application No. 10-2021-0055725 (KR), filed on Apr. 29, 2021; and application No. 10-2022-0023495 (KR), filed on Feb. 23, 2022.
Prior Publication US 2022/0351929 A1, Nov. 3, 2022
Int. Cl. H01J 35/16 (2006.01); H01J 35/06 (2006.01); H01J 35/04 (2006.01)
CPC H01J 35/16 (2013.01) [H01J 35/045 (2013.01); H01J 35/064 (2019.05)] 20 Claims
OG exemplary drawing
 
1. An X-ray tube, comprising:
a first electrode;
a second electrode spaced apart from the first electrode;
a target disposed in a lower portion of the second electrode;
an emitter disposed on the first electrode;
a third electrode which is positioned between the first electrode and the second electrode and comprising an opening at a position perpendicularly corresponding to the emitter; and
a spacer provided on the third electrode and surrounding the second electrode,
wherein the spacer comprises a first section located adjacent to the third electrode and a second section disposed on the first section,
wherein the spacer comprises a ceramic insulator and conductive dopants dispersed within the ceramic insulator,
wherein a concentration of the conductive dopants in the first section of the spacer is greater than a concentration of the conductive dopants in the second section,
wherein the third electrode is in contact with the first section of the spacer, and
wherein the first electrode comprises a cathode electrode, the second electrode comprises an anode electrode and the third electrode comprises a gate electrode.