US 12,266,519 B2
Carbon nanotube (CNT) paste emitter, method of manufacturing the same, and X-ray tube apparatus using the same
Cheol Jin Lee, Seoul (KR); Han Bin Go, Seongnam-si (KR); and Sang Heon Lee, Seoul (KR)
Assigned to Korea University Research and Business Foundation, Seoul (KR)
Filed by Korea University Research and Business Foundation, Seoul (KR)
Filed on Jun. 29, 2022, as Appl. No. 17/853,124.
Application 17/853,124 is a continuation of application No. PCT/KR2020/006518, filed on May 19, 2020.
Claims priority of application No. 10-2019-0178646 (KR), filed on Dec. 30, 2019; and application No. 10-2020-0034214 (KR), filed on Mar. 20, 2020.
Prior Publication US 2022/0399177 A1, Dec. 15, 2022
Int. Cl. H01J 9/02 (2006.01); H01J 35/06 (2006.01)
CPC H01J 9/025 (2013.01) [H01J 35/065 (2013.01); H01J 2201/30469 (2013.01)] 4 Claims
OG exemplary drawing
 
1. An X-ray tube apparatus using a CNT paste emitter, comprising:
a cathode electrode coupled to the CNT paste emitter;
a gate electrode disposed above the cathode electrode, having a hole greater in size than the CNT paste emitter and coupled to a first graphene film on its lower or upper surface;
a focusing lens disposed above the gate electrode;
an anode electrode disposed above the focusing lens to face the cathode electrode; and
a tube housing surrounding the cathode electrode, the gate electrode, the focusing lens and the anode electrode,
wherein the cathode electrode comprises:
the CNT paste emitter disposed on a metal or graphite substrate; and
an interface layer inserted between the metal or graphite substrate and the CNT paste emitter, and wherein the interface layer is comprises a second graphene film or a graphite film.