公开(公告)号：US20190019647A1

公开(公告)日：2019-01-17

申请号：US15787273

申请日：2017-10-18

Applicant: SUNJE HI-TEK CO., LTD.

Inventor： Dong-Hoon LEE ,  Sang-Hyo KIM ,  Eun-Min KIM ,  Sang-Bong SEO ,  Dong-Gil JUNG ,  Sih-Wan HEO ,  Dongkyu SEOL

IPC: H01J35/14 ,  H01J35/18 ,  H01J35/06

Abstract: Disclosed is an X-ray tube for improving electron focusing, which allows thermoelectrons emitted from a filament to efficiently reach a target of an X-ray irradiation window. To achieve this, the X-ray tube includes: a thermionic emitter configured to emit thermoelectrons by application of a negative high voltage; a focusing tube configured to focus the thermoelectrons emitted from the thermionic emitter; an X-ray irradiation window configured to irradiate X-rays outside by the thermoelectrons bombarded on a target distributed on the X-ray irradiation window, to generate the X-rays after the thermoelectrons pass through the focusing tube; a tube part including both the thermionic emitter and the focusing tube; and a housing surrounding the tube part, wherein the focusing tube and the housing are configured to have a same potential such that movement directions of the thermoelectrons are directed to the X-ray irradiation window.