Abstract:
A scandate dispenser cathode having a cathode body (4) arranged on a cathode support (3), a cathode coating (5, 6) comprising a layer system (6) consisting of one or more alternating layers of rhenium or a rhenium alloy (61) and of scandium oxide or a scandium alloy (62), and an activation acceleration layer system (5) arranged between the cathode body (4) and the layer system (6), said activation acceleration layer system comprising at least one release layer (52) comprising alkaline earth metal oxide, preferably barium oxide, and an activator layer system (51) comprising a barrier material with greater oxidation resistance than the material of the cathode body and an activator material for reducing the alkaline earth metal oxide, preferably barium oxide.
Abstract:
The invention relates to a cathode arrangement (20) comprising: a cathode body housing an emission surface (32) for emitting electrons in a longitudinal direction (Z), wherein the emission surface is bounded by an emission perimeter (35); a focusing electrode (40) at least partially enclosing the cathode body in a transversal direction and comprising an electron transmission aperture (44) for focusing the electrons emitted by the emission surface, wherein the aperture is bounded by an aperture perimeter (45), wherein the cathode body is moveably arranged within the focusing electrode over a maximum transversal distance (d1) from an aligned position (R0), and wherein the aperture perimeter transversally extends over the emission surface and beyond the emission perimeter over an overlap distance (d2) that exceeds the maximum transversal distance.
Abstract:
Es wird eine Elektronenkanone angegeben,die eine einen Kathodenhalter und einen Kathodenkörper aufweisende Kathode und einen Wehnelt-Zylinder umfasst, wobei der Kathodenhalter den Kathodenkörper aufnimmt und der Wehnelt-Zylinder geeignet ist, freie Elektronen, die aus dem Kathodenkörper in Richtung des Wehnelt-Zylinders austreten können, zu einem Elektronenstrahl zu bündeln, und der Wehnelt-Zylinder zumindest abschnittsweise entlang einer dem Kathodenhalter zugewandten ersten Innenfläche formschlüssig auf einer Außenfläche des Kathodenhalters angeordnet ist und den Kathodenhalter zumindest teilweise umschließt.
Abstract:
A cathode electrode (cathode structure) capable of reducing an electron beam spot diameter and a cathode drive voltage, and ensuring an extended stabilization of a cathode current. A cathode electrode which is formed with a non-electron-beam-emitting dent or region (9a) in the vicinity of the center or the outer periphery of the emissive material (9) of the cathode electrode (1) to thereby emit a hollow electron beam (13), and a production method therefor; and an electron gun and a cathode ray tube.
Abstract:
A cathode-ray tube having a high resolution achieved without lowering the electron emission characteristics. A printing paste containing a mixture, in combination, of first particles of needle-like shape and second particles of lump shape both of a carbonate of an alkaline earth metal is used to serve as an electron emitting material. The paste is applied to a metallic base by screen-printing and dried. The resultant base is assembled as an oxide cathode in a cathode-ray tube. To turn the carbonate into an oxide, the tube is evacuated and the cathode is heated. Thus, the surface of the cathode is planarized.
Abstract:
The invention relates to a cathode arrangement (20) comprising: • - a thermionic cathode comprising an emission portion (30) provided with an emission surface for emitting electrons, and a reservoir (38) for holding a material, wherein the material, when heated, releases work function lowering particles that diffuse towards the emission portion and emanate at the emission surface at a first evaporation rate; • - a focusing electrode (40) comprising a focusing surface for focusing the electrons emitted from the emission surface of the cathode; and • - an adjustable heat source (50) configured for keeping the focusing surface at a temperature at which accumulation of work function lowering particles on the focusing surface is prevented.
Abstract:
The invention relates to a cathode arrangement (20) comprising: a cathode body housing an emission surface (32) for emitting electrons in a longitudinal direction (Z), wherein the emission surface is bounded by an emission perimeter (35); a focusing electrode (40) at least partially enclosing the cathode body in a transversal direction and comprising an electron transmission aperture (44) for focusing the electrons emitted by the emission surface, wherein the aperture is bounded by an aperture perimeter (45), wherein the cathode body is moveably arranged within the focusing electrode over a maximum transversal distance (d1) from an aligned position (R0), and wherein the aperture perimeter transversally extends over the emission surface and beyond the emission perimeter over an overlap distance (d2) that exceeds the maximum transversal distance.
Abstract:
A method of manufacturing an emitter (8; 10) for a thermionic dispenser cathode, includes forming a porous emitter body with substantially interconnected pores, having an emission surface (11; 16) from which, upon application of heat, electrons are emitted. The porous emitter body is suitable for transporting through the substantially interconnected pores, a compound released upon application of heat, to the emission surface (11; 16), which compound, when deposited on the emission surface (11; 16), serves to lower an effective work function of the emitter (8; 10). The porous emitter body is formed by means of a process of deposition of material. At least a region of the porous emitter body is provided with a continuously varying porosity. The porosity is continuously varied by controlling at least one parameter of the deposition process.
Abstract:
A cathode for electron emission, comprising a heating device (1, 2) for generating temperatures above 300°C, an electrically conductive cathode support (3) which is connected to the heating device (1, 2), and a cathode coating which is applied to the cathode support (3) and consists of an electron-emitting material (4) comprising at least one alkali metal selected from the group consisting of sodium, potassium, rubidium and cesium, with an emission current density > 10 A/m2 at an operating temperature between 300°C and 600°C.
Abstract translation:一种用于电子发射的阴极,包括用于产生高于300℃的温度的加热装置(1,2),连接到加热装置(1,2)的导电阴极支撑件(3)和阴极涂层 施加到阴极支撑体(3)上并且由包含至少一种选自钠,钾,铷和铯的碱金属的电子发射材料(4)组成,发射电流密度> 10A / m 2 工作温度在300°C至600°C之间。