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Patent Searching and Data


Title:
X-RAY TUBE FOR IMPROVING ELECTRON FOCUSING
Document Type and Number:
WIPO Patent Application WO/2018/079946
Kind Code:
A1
Abstract:
The present invention relates to "an X-ray tube for improving electron focusing" capable of guiding thermoelectrons discharged from a filament such that the thermoelectrons can efficiently move to a target on an X-ray irradiation window and reducing a proportion of impurities having been adsorbed in the filament. The X-ray tube for improving electron focus, proposed in the present invention, comprises: a non-conductive tubular pipe forming a body and having a hollow; the X-ray irradiation window which is formed so as to shield the upper end part of the tubular pipe, has a target coated thereon, and allows an X-ray to be irradiated therethrough; a stem part formed so as to shield the lower end part of the tubular pipe; a plurality of metal wires which extend towards the inside of the tubular pipe from the outside of the stem part and to which a predetermined negative high voltage is applied; the filament connected between the metal wires extending towards the inside of the tubular pipe, and discharging thermoelectrons; a first focusing tube encompassing the filament in order to focus the thermoelectrons discharged from the filament; and a cylindrical shield housing made of a conductive material and encompassing the outside of the tubular pipe, wherein the shield housing has the same voltage as the predetermined negative high voltage applied to the metal wires. The X-ray tube for improving electron focusing, proposed in the present invention, has the following advantages. 1. The thermoelectrons discharged from the filament can be efficiently moved to the target by providing an additional focusing tube at the lower part of the X-ray irradiation window. 2. The probability that gas-phased impurities are adsorbed on the filament (- voltage) located inside a focusing tube can be reduced by causing the impurities to be delaminated (released) from the target and adsorbed on the inner wall of the tubular pipe by the shield housing outside the tubular pipe, to which a negative voltage is applied, thereby enabling the life span of the filament to improve. 3. The probability that the thermoelectrons discharged from the filament can be moved to the X-ray irradiation window is to be improved by forming a shield wing part in the first focusing tube and dividing a space inside the tubular pipe into two.

Inventors:
LEE DONGHOON (KR)
KIM SANGHYO (KR)
KIM EUNMIN (KR)
KIM SOOHYUN (KR)
JUNG DONGGIL (KR)
KIM JUNGDONG (KR)
Application Number:
PCT/KR2017/002046
Publication Date:
May 03, 2018
Filing Date:
February 24, 2017
Export Citation:
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Assignee:
SUNJE HI TEK CO LTD (KR)
International Classes:
H01J35/14; H01J35/06; H01J35/16
Foreign References:
KR101439208B12014-09-12
US20090268873A12009-10-29
KR101151859B12012-05-31
KR20140043671A2014-04-10
KR20160058582A2016-05-25
Attorney, Agent or Firm:
JUNG, Namjin (KR)
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