Abstract:
제안기술은 열음극재 제조 방법에 관한 것으로, 더욱 상세하게는 균질한 미세조직을 가지면서도 근사정형 제어가 가능한 사출성형 공정을 활용하여, 열전자 방출 특성이 향상되며 제조가 용이한 열음극재 제조 방법에 관한 발명이다. 본 발명의 열음극재 제조 방법은 원재료에 바인더를 혼합하여 혼합체를 제조하는 단계; 상기 혼합체를 근사정형 형상의 금형을 이용하여 사출 성형하는 단계; 상기 사출 성형을 통해 사출된 성형체에서 바인더를 제거하는 단계; 상기 바인더가 제거된 성형체를 소결하는 단계; 소결된 상기 성형체인 소결체에 열전자 활성제를 함침하는 단계; 함침된 상기 소결체인 함침체에 열전자 방출면을 기계가공하여 제조하는 단계; 를 포함한다.
Abstract:
An X-ray tube can include: a cathode planar emitter that emits an inhomogeneous electron beam; an anode to receive the electron beam; a first magnetic quadrupole having a first yoke with four evenly distributed first pole projections extending from the first yoke (404) and oriented toward a central axis of the first yoke and each of the four first pole projections having a first quadrupole electromagnetic coil; a second magnetic quadrupole having a second yoke (402) with four evenly distributed second pole projections extending from the second yoke and oriented toward a central axis of the second yoke and each of the four second pole projections having a second quadrupole electromagnetic coil; and at least one coil (on 450) of a first pair of opposing coils with alternating current offset from the power supply. Alternative soultions i.a. with AC offset current directly to quadrupole coils instead of the separate coil as well as details of the emitter are disclosed.
Abstract:
The invention describes an emitter device (10) and a method for precisely mounting a thin film electron emitter foil into a cathode cup. Therefore, small fixing bars (71) are realized to keep fine and hence weak emitter structures in position while fixing this setup onto a cathode cup. After mounting those temporary structures are removed (72) to get the final functional emitter-cathode setup.
Abstract:
This invention provides an oxide cathode comprising a body having a base layer, the body comprising a metallic component and a reducing component, and an electron-emitting layer on the base layer, wherein a diffusion inhibiting layer covers at least a proportion of at least the outer surface of the body not covered by the electron-emitting layer. The invention further provides a method of manufacturing an oxide cathode having an indirectly heated electron-emitting layer disposed on a base layer of a cathode body, which body comprises a reducing component, the method comprising forming a diffusion-inhibiting layer over at least substantially most of the surface of a cathode body, etching away the diffusion-inhibiting layer from the base layer, and forming an electron-emitting layer over the base layer.
Abstract:
A tungsten wire containing 1−10 mass% of rhenium, characterized in that the point showing 2% expansion of a heated tungsten wire having a diameter of x µm and heated by application of a current of which the ratio to the fusing current (FC) of the tungsten wire of x µm diameter is y% is within the quadrilateral defined by connecting point (20, 75), point (20, 87), point (90, 75), and point (90, 58) by straight lines in a semilogarithmic coordinate system in which point (x, y) is shown, of which the horizontal axis is marked with a logarithmic scale of diameter x, and of which the vertical axis is marked with an ordinary scale of the ratio y to the fusing current. The tungsten wire expands greatly even under high−temperature condition, exhibits excellent durability when used as a constituent material of, e.g., a cathode heater and can be produced efficiently.
Abstract:
An X-ray tube can include: a cathode planar emitter that emits an inhomogeneous electron beam; an anode to receive the electron beam; a first magnetic quadrupole having a first yoke with four evenly distributed first pole projections extending from the first yoke (404) and oriented toward a central axis of the first yoke and each of the four first pole projections having a first quadrupole electromagnetic coil; a second magnetic quadrupole having a second yoke (402) with four evenly distributed second pole projections extending from the second yoke and oriented toward a central axis of the second yoke and each of the four second pole projections having a second quadrupole electromagnetic coil; and at least one coil (on 450) of a first pair of opposing coils with alternating current offset from the power supply. Alternative soultions i.a. with AC offset current directly to quadrupole coils instead of the separate coil as well as details of the emitter are disclosed.
Abstract:
Die vorliegende Erfindung betrifft ein Verfahren zum Herstellen einer Elektrode (16) für eine Hochdruckentladungslampe (10), folgende Schritte umfassend: a) Überstreichen zumindest eines Teils der Elektrodenoberfläche zur Erzeugung einer Oxidschicht (Schritt 120), vorzugsweise mit einem Laserstrahl; b) Zumindest teilweises Sublimieren der in Schritt a) entstehenden Oxidschicht (Schritt 120); und c) Reduzieren der restlichen Oxidschicht (140). Sie betrifft überdies eine Hochdruckentladungslampe (10) mit mindestens einer derart hergestellten Elektrode.
Abstract:
Disclosed are cathode units for use in fluorescent discharge lamps which include a stem element adapted for sealing engagement with an end of an elongated vitreous/glass tube, first and second electrode support wires extending axially through the stem element, and a filament electrode which is oriented substantially axially with respect to the support wires. The support wires each have a inwardly-directed tip portion and the filament electrode is attached thereto. The ends of the filament electrode are attached to the support wires by welding. In alternative embodiments, the disclosed cathode unit can further include an electrode shield assembly.