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EP1232511B1 - Cathode a oxyde - Google Patents

Cathode a oxyde Download PDF

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Publication number
EP1232511B1
EP1232511B1 EP01980367A EP01980367A EP1232511B1 EP 1232511 B1 EP1232511 B1 EP 1232511B1 EP 01980367 A EP01980367 A EP 01980367A EP 01980367 A EP01980367 A EP 01980367A EP 1232511 B1 EP1232511 B1 EP 1232511B1
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EP
European Patent Office
Prior art keywords
cathode
oxide
metal
particles
group
Prior art date
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Expired - Lifetime
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EP01980367A
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German (de)
English (en)
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EP1232511A1 (fr
Inventor
Georg F. Gaertner
Detlef Raasch
Christopher J. Goodhand
Petrus A. M. Van Der Heide
Timothy J. Lee
Davis S Barrat
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Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
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Philips Intellectual Property and Standards GmbH
Koninklijke Philips Electronics NV
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/04—Cathodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/14—Solid thermionic cathodes characterised by the material

Definitions

  • the invention relates to an oxide anode comprising a cathode support having a cathode base of a first cathode metal and a cathode coating of an electron-emitting material containing a second cathode metal and at least one alkaline earth oxide selected from the group of the oxides of calcium, strontium and barium.
  • the electron beam generation functional group includes an electron-emitting cathode which generates the electron current in the cathode ray tube and which is emitted by a control grid, e.g. a Wehnelt cylinder with a pinhole on the front side, is surrounded.
  • a control grid e.g. a Wehnelt cylinder with a pinhole on the front side
  • An electron-emitting cathode for a cathode ray tube is usually a point-shaped, heatable oxide cathode with an electron-emitting, oxide-containing cathode coating. When an oxide cathode is heated, electrons from the emitting coating are evaporated into the surrounding vacuum.
  • the amount of electrons that can be emitted from the cathode coating depends on the work function of the electron-emitting material.
  • Nickel which is typically used as a cathode base, has a relatively high work function by itself. Therefore, the metal of the cathode base is usually coated with a material whose main purpose is to improve the electron-emitting properties of the cathode base.
  • Characteristic of the Oxide oxide cathode electron-emitting coating materials are such that they contain an alkaline earth metal in the form of the alkaline earth metal oxide.
  • a correspondingly shaped sheet of nickel alloy is coated, for example, with the carbonates of the alkaline earth metals in a binder formulation.
  • the carbonates are converted to the oxides at temperatures of about 1000 ° C.
  • the activation process transforms the originally non-conducting ion lattice of the alkaline earth oxides into an electronic semiconductor by incorporating donor-type impurities into the crystal lattice of the oxides.
  • the impurities consist essentially of elemental alkaline earth metal, z.
  • the electron emission of the oxide cathodes is based on the impurity mechanism.
  • the purpose of the activation process is to provide a sufficient amount of excess elemental alkaline earth metal that allows the oxides in the electron-emitting coating to deliver the maximum emission current at a prescribed heat output.
  • An essential contribution to the activation process is the reduction of barium oxide to elemental barium by alloy components ("activators") of the nickel from the cathode base.
  • the cathode coating constantly loses alkaline earth metal during the life of the cathode. Partly the cathode material evaporates slowly in total, partly it is sputtered off by the ion current in the cathode ray tube.
  • the elemental alkaline earth metal is replenished again and again.
  • the subsequent delivery of elemental alkaline earth metal by reduction of the alkaline earth metal oxide at the cathode metal or activator metal comes to a standstill, if formed between the cathode base and the emitting oxide with time a thin, but high-impedance interface (interface) of alkaline earth silicate or alkaline earth aluminate.
  • an oxide cathode with improved donor density and extended life comprising a nickel alloy cup filled with a nickel alloy wire ball and an alkaline earth carbonate mixture.
  • US 4797593 discloses an oxide cathode having an improved electron emission characteristic comprising a base containing nickel as the principal element and a base layer of an electron-emitting substance, which layer includes not only alkali metal oxides as the principal component of at least barium but also rare -Erd metal oxides containing by weight between 0.1 and 20 wt .-% or rare earth metals having a weight fraction between 0.05 and 17 wt .-%.
  • the electron-emitting layer further comprises a powder of at least one of nickel and cobalt in a weight proportion of 10% by weight or less. Nickel and / or cobalt powders serve to provide better conductivity for the electron-emitting layer and to improve the adhesion properties of this layer. Nonetheless, the powder does not affect or enhance the distribution of the elemental alkali metal oxide.
  • an oxide cathode comprising a cathode support having a cathode base made of a first cathode metal with a cover layer consisting of ultrafine metal particles containing nickel, and a cathode coating of an electron-emitting material comprising a particle-particle composite oxide particles and metal particles, the oxide particles comprising an oxide selected from the oxides of scandium, yttrium and the lanthanides cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium and an alkaline earth oxide selected from of the group of oxides of calcium, strontium and barium, and the metal particles comprise a second cathode metal selected from the group consisting of Ni, Co, Ir, Re, Pd, Rh and Pt.
  • a cathode ray tube having such an oxide cathode has a uniform beam current over a long period of time because the homogeneous distribution of the reducing cathode metal and the activator metal in the material of the electron-emitting cathode coating, the growth of high-resistance intermediate layers is distributed locally and reduced overall. It can be supplied longer elementary barium.
  • the covering layer which consists of ultrafine metal particles containing nickel, is particularly advantageous. It forms a dissolved border between cathode base and cathode coating. As a result, the formation of a high-impedance deactivating separating layer between the cathode base and the cathode coating is discontinuous and the resistance of the high-resistance separating layer is reduced. Local activator replenishment and activator diffusion is encouraged.
  • Continuous barium tracking avoids electron emission depletion, as known from conventional oxide cathodes. Significantly higher beam current densities can be realized without jeopardizing the cathode lifetime. This can also be exploited to pull the necessary electron beam currents from smaller cathode areas.
  • the spot size of the cathode spot is critical to the quality of beam focusing on the screen. The image sharpness over the entire screen is increased. Moreover, as the cathodes age very slowly, image brightness and image sharpness can be kept stable at a high level throughout the life of the tube.
  • the first cathode metal is preferably a metal selected from the group consisting of Ni, Co, Ir, Re, Pd, Rh and Pt.
  • the first cathode metal is an alloy of a metal selected from the group consisting of Ni, Co, Ir, Re, Pd, Rh and Pt with an activator metal selected from the group Mg, Mn, Fe, Si, W, Mo , Cr, Ti, Hf, Zr, Al.
  • the cover layer additionally contains an activator metal selected from the group Mg, Mn, Fe, Si, W, Mo, Cr, Ti, Hf, Zr, Al. This reduces the sensitivity to "poisoning" by residual gases in the cathode tube vacuum. It is particularly preferred if the metal particles contain a slow activator selected from the group Al, Mo, Ti and Si. The slow activators are preferably added in an amount of 1 to 4 wt .-%.
  • the metal particles in the electron-emitting material may also be preferred for the metal particles in the electron-emitting material to be an alloy of a second cathode metal selected from the group consisting of Ni, Co, Ir, Re, Pd, Rh and Pt with an activator metal selected from the group consisting of Mg, Mn, Fe, Si, W, Mo, Cr, Ti, Hf, Zr, Al.
  • a second cathode metal selected from the group consisting of Ni, Co, Ir, Re, Pd, Rh and Pt
  • an activator metal selected from the group consisting of Mg, Mn, Fe, Si, W, Mo, Cr, Ti, Hf, Zr, Al.
  • the oxide particles may be oxide particles of an alkaline earth oxide selected from the group of the oxides of calcium, strontium and barium, with an oxide selected from the oxides of scandium, yttrium and the lanthanides cerium, praseodymium, neodymium, Samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium
  • the oxide particles contain oxide particles of an alkaline earth oxide selected from the group of the oxides of calcium, strontium and barium, which is doped with one of the oxide of yttrium.
  • Yttrium oxide surprisingly accelerates the sintering of the oxides in the production.
  • the oxide particles contain oxide particles of an oxide selected from the oxides of scandium, yttrium and lanthanides cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium, and Oxide particles of an alkaline earth oxide, selected from the group of the oxides of calcium, strontium and barium.
  • the electron-emitting material may contain 1 to 5 wt% of metal particles.
  • the electron-emitting material contains 2.5 wt .-% nickel particles.
  • the metal particles have an ellipsoidal or spherical shape. This makes the diffusion of the activator metals more controlled and the barium emission locally and temporally more uniform.
  • the mean particle diameter of the metal particles is preferably 0.2 to 5.0 ⁇ m.
  • the metal particles are embedded in the particle-particle composite oriented, in particular that the metal particles in the particle-particle composite are embedded vertically to the cathode base surface.
  • the metal particles are embedded in the particle-particle composite with a concentration gradient.
  • the invention also relates to an oxide cathode comprising a cathode support having a cathode base of a first cathode metal with a cover layer consisting of ultrafine metal particles containing nickel, and a cathode coating of an electron-emitting material comprising a particle-particle composite of oxide particles and Contains metal particles, wherein the oxide particles selected from the oxides of scandium, yttrium and lanthanides cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium and an alkaline earth oxide selected from the Group of oxides of calcium, strontium and barium, and the metal particles containing a second cathode metal selected from the group consisting of Ni, Co, Ir, Re, Pd, Rh and Pt comprises.
  • Fig. 1 shows a schematic cross section through an embodiment of the oxide cathode according to the invention.
  • a cathode ray tube is provided with an electron gun, usually including an array with one or more oxide cathodes.
  • An oxide cathode according to the invention comprises a cathode support having a cathode base and a cover layer consisting of ultrafine metal particles containing nickel and a cathode coating.
  • the cathode support contains the heater and the base with the topcoat.
  • the structures and materials known from the prior art can be used as the cathode support.
  • the oxide cathode consists of a cathode support, i. a cylindrical tube 3, in which the heating wire 4 is inserted, from a cap 2, which forms the cathode base, with the cover layer 7 and from a cathode coating 1, which represents the actual cathode body.
  • the material of the cathode base is preferably a metal selected from the group Ni, Co, Ir, Re, Pd, Rh and Pt.
  • a nickel alloy is used.
  • the nickel alloys for the base of the oxide cathodes according to the invention may consist of nickel with an alloying component of a reducing activator element selected from the group of magnesium, manganese, iron, silicon, tungsten, molybdenum, chromium, titanium, hafnium, zirconium and aluminum. Since the cathode coating also contains activator elements, the amount of activator elements in the cathode base material can be kept low. An alloying amount of 0.05 to 0.8% of activator metal in the cathode base material is preferred.
  • the cathode base is coated with a topcoat consisting of ultrafine metal particles containing nickel.
  • the particle size of the ultrafine particles is less than 100 nm.
  • the ultrafine particles preferably contain an activator selected from the group consisting of Mg, Al, Mo, Ti, Si, Cr, Zr, Mg. It is particularly preferred if the metal particles comprise a slow activator Group Al, Mo, Ti and Si contains.
  • the slow activators are preferably added in an amount of 1 to 4 wt .-%.
  • the cathode coating contains an electron-emitting material that consists of a particle-particle composite.
  • the main component of the particle-particle composite in the electron-emitting material are oxide particles 6 comprising an oxide selected from the oxides of scandium, yttrium and lanthanides cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, Thulium, ytterbium and lutetium; and an alkaline earth oxide selected from the group of oxides of calcium, strontium and barium.
  • the oxide particles may include oxide particles having alkaline earth metal oxides doped with the oxides of scandium, yttrium and lanthanides such as cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium.
  • the oxide particles contain oxide particles with oxides of the alkaline earth metal, and oxide particles with the oxides of scandium, yttrium and lanthanides cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium.
  • Barium oxide, together with calcium oxide or / and strontium oxide is preferred as the alkaline earth oxide.
  • the alkaline earth oxides are used as a physical mixture of alkaline earth oxides or as binary or ternary mixed crystals of the alkaline earth metal oxides. Preferred is a ternary alkaline earth mixed crystal oxide of barium oxide, strontium oxide and calcium oxide or a binary mixture of barium oxide and calcium oxide.
  • the alkaline earth oxide may be doped with an oxide selected from the oxides of scandium, yttrium and the lanthanides cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium, e.g. B. in an amount of 10 to a maximum of 1000 ppm included.
  • the ions of scandium, yttrium and lanthanides occupy lattice sites or interstitials in the crystal lattice of alkaline earth metal oxides.
  • Yttrium is preferably used as doping.
  • the doped oxides are obtained by coprecipitation.
  • oxide particles of the alkaline earth oxides and oxide particles of the oxides of scandium, yttrium and lanthanides cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium can also be prepared separately and used as a physical mixture become.
  • the particle-particle composite of the electron-emitting material contains, as a second component, metal particles 5 containing the second cathode metal.
  • the material for the second component is an alloy of a second one Cathode metal selected from the group Ni, Co, Ir, Re, Pd, Rh and Pt with an activator metal selected from the group Mg, Mn, Fe, Si, W, Mo, Cr, Ti, Hf, Zr, Al.
  • metal particles having a spherical or ellipsoidal grain shape may be preferably used.
  • the mean grain diameter is preferably 0.2 to 5 microns. It is also possible to use needle-shaped metal particles having a maximum grain diameter of 10 to 15 ⁇ m. Such acicular particles may be aligned vertically to the cathode base by suitable deposition techniques.
  • the slowly diffusing activator metals such as Mo and W in a concentration of 2 to 10 wt .-% in the alloy are particularly suitable.
  • the faster diffusing activator metals such as Zr and Mg are suitable.
  • the ultrafine particles containing nickel or nickel and another cathode metal can be prepared from the respective targets by a laser ablation method.
  • These targets contain cathode nickel, which can be alloyed with activators such as Mg.Al, Ti, Zr, Si, Cr, Zr, and Mg.
  • the ultrafine particles for the topcoat may be prepared separately and applied to the cathode base by a conventional coating process. It is also possible to deposit the ultrafine particles for the cover layer directly by laser ablation on the cathode base. It is also possible to use wet-chemical or sol-gel preparation methods to prepare the ultrafine particles.
  • the carbonates of the alkaline earth metals calcium, strontium and barium are ground together and mixed.
  • the weight ratio of calcium carbonate: strontium carbonate: barium carbonate: zirconium is equal to 25.2: 31.5: 40.3: 3.or1: 1.25: 6 or 1:12:22 or 1: 1.5: 2.5 or 1: 4: 6 ,
  • One or more oxides of scandium, yttrium and the lanthanides cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium are added to the carbonates.
  • Y 2 O 3 is added in an amount of 130 ppm.
  • Carbonates, oxides and metal particles are mixed into the raw material.
  • the raw material can still be added to a binder preparation.
  • the binder preparation may contain, as solvent, water, ethanol, ethyl nitrate, ethyl acetate, or diethyl acetate.
  • the raw material for the cathode coating is then applied to the cathode base by brushing, dipping, cataphoretic deposition or spraying.
  • the thickness of the cathode coating is preferably 30 to 80 ⁇ m.
  • the coated oxide cathodes are installed in the cathode ray tube. During the evacuation of the cathode ray tube, the cathodes are formed. For this purpose, they are heated to a temperature of 1000 ° C to 1200 ° C. At this temperature, the alkaline earth carbonates are converted to the alkaline earth oxides to release CO and CO 2 and then form a porous sintered body. After this "burning off" of the cathodes is the activation, which has the purpose to provide excess, embedded in the oxides, elemental alkaline earth metal. The excess alkaline earth metal is formed by reduction of alkaline earth metal oxide. During the actual reduction activation, the alkaline earth oxide is reduced by the liberated CO or activator metal. In addition, there is a current activation, which generates the formation of the required free alkaline earth metal by electrolytic processes at high temperatures.
  • the finished-formed, electron-emitting material may preferably contain 1 to 5 wt .-% metal particles.
  • a cathode tube cathode has a cap-shaped cathode base made of an alloy of nickel with 0.12 wt% Mg, 0.06 wt% Al, and 2.0 wt% W assures on.
  • the cathode base is located at the top of a cylindrical cathode support (sleeve) in which the heater is mounted.
  • the cathode base is placed in the ablation chamber of a laser ablation unit.
  • An excimer laser beam is directed at a pressure of a few mbars onto a rotating cylindrical cathode-nickel target containing an appropriate amount of activators and ablates it.
  • a plasma torch with ablated ultrafine particles forms over the target.
  • These ablated ultrafine particles are transported to the cathode base by means of a carrier gas flow of Ar / H 2 and deposited there.
  • the carrier gas of Ar / H 2 prevents oxidation of the particles during transport.
  • Other inert gases may also be suitable for this purpose.
  • the laser ablation is started at low pressures by 10 -2 mbar and low carrier gas pressure, whereby initially a fine-grained compact layer of nickel particles is formed. Subsequently, the gas pressure and the carrier gas flow are increased to achieve deposition of ultrafine particles. This allows a continuous transition from compact layers to ultra-fine particle layers.
  • the cathode has a cathode coating on top of the cathode base.
  • the cathode base is first cleaned. Then, 2.0 wt% metal particles and 98 wt% powder of a starting compound for the oxide particles containing 130 ppm of yttria are suspended in a solution of ethanol, butyl acetate and nitrocellulose.
  • the metal particles consist of an alloy of nickel with 0.02 wt .-% Al, 3.0 wt .-% W and 6.0 wt .-% Mo.
  • the metal particles have a needle-like grain shape with a mean needle length of 3 ⁇ 2 microns.
  • the powder with the starting compounds for the oxide particles consists of barium strontium carbonate with 130 ppm yttrium oxide. This suspension is sprayed onto the cathode base.
  • the layer is formed at a temperature of 650 to 1100 ° C to effect alloying and diffusion between the metal base of the metal base and the metal particles.
  • the cathode thus formed has a direct current capability of 4 A / cm 2 with a lifetime of 20,000 h and a tube internal pressure of 2 * 10 -9 bar.

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  • Solid Thermionic Cathode (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
  • Cold Cathode And The Manufacture (AREA)
  • Primary Cells (AREA)

Claims (18)

  1. Cathode à oxyde qui comprend un support de cathode avec une base de cathode (2) composé d'un premier métal de cathode et d'un revêtement de cathode (1) à partir d'un matériau émetteur d'électrons qui contient un matériau composite particules-particules à partir de particules d'oxyde (6) et de particules métalliques (5), les particules d'oxyde comprenant un oxyde sélectionné à partir des oxydes de scandium, d'yttrium et des lanthanides cérium, praséodyme, néodyme, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium et lutétium et un oxyde alcalino-terreux du groupe des oxydes de calcium, de strontium et de baryum,
    caractérisé en ce que la base de cathode (2) se compose d'un premier métal de cathode avec un couche de couverture à partir de particules métalliques ultrafines qui contiennent du nickel et que les particules métalliques (5) contiennent un deuxième métal de cathodes sélectionné dans le groupe Ni, Co, Ir, Re, Pd, Rh et Pt.
  2. Oxyde de cathode selon la revendication 1, caractérisée en ce que le premier métal de cathode est un métal sélectionné dans le groupe Ni, Co, Ir, Re, Pd, Rh et Pt.
  3. Cathode à oxyde selon la revendication 1, caractérisée en ce que le premier métal de cathode contient un alliage d'un métal choisi dans le groupe Ni, Co, Ir, Re, Pd, Rh et Pt avec un métal activateur choisi dans le groupe Mg, Mn, Fe, Si, W, Mo, Cr, Ti, Hf, Zr et Al.
  4. Cathode à oxyde selon la revendication 1, caractérisée en ce que la couche de couverture contient par ailleurs un métal activateur choisi dans le groupe Mg, Mn, Fe, Si, W, Mo, Cr, Ti, Hf, Zr et Al.
  5. Cathode à oxyde selon la revendication 1, caractérisée en ce que les particules métalliques ultrafines contiennent un activateur lent choisi dans le groupe Al, Mo, Ti et Si.
  6. Cathode à oxyde selon la revendication 5, caractérisée en ce que les activateurs lents sont ajoutés dans une quantité de 1 à 4 % en poids.
  7. Cathode à oxyde selon la revendication 1, caractérisée en ce que les particules métalliques (5) dans le matériau émetteur d'électrons contiennent un alliage d'un deuxième métal de cathode choisi dans le groupe Ni, Co, Ir, Re, Pd, Rh et Pt avec un métal activateur choisi dans le groupe Mg, Mn, Fe, Si, W, Mo, Cr, Ti, Hf, Zr, Al.
  8. Cathode à oxyde selon la revendication 1, caractérisée en ce que les particules d'oxyde (6) contiennent des particules d'oxyde d'un oxyde alcalino-terreux choisi dans le groupe de l'oxyde de calcium, de strontium et de baryum qui est dopé d'un oxyde choisi parmi les oxydes de scandium, d'yttrium et des lanthanides cérium, praséodyme, néodyme, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium et lutétium.
  9. Cathode à oxyde selon la revendication 1, caractérisé en ce que les particules d'oxyde (6) sont des particules d'oxyde d'un oxyde alcalino-terreux choisi dans le groupe des oxydes de calcium, de strontium et de baryum qui est dopé d'un oxyde d'yttrium.
  10. Cathode à oxyde selon la revendication 1, caractérisée en ce que le matériau émetteur d'électrons contient 1 à 5 % en poids de particules métalliques (5).
  11. Cathode à oxyde selon la revendication 1, caractérisée en ce que le matériau émetteur d'électrons contient 2,5 % en poids de particules de nickel (5).
  12. Cathode à oxyde selon la revendication 1, caractérisée en ce que les particules métalliques (5) ont une forme ellipsoïdale ou sphérique.
  13. Cathode à oxyde selon la revendication 1, caractérisée en ce que le diamètre moyen des particules métalliques (5) ont une forme aciculaire.
  14. Cathode à oxyde selon la revendication 1, caractérisée en ce que le diamètre moyen des particules métalliques (5) s'élève à 0,2 à 5,0 µm.
  15. Cathode à oxyde selon la revendication 1 caractérisée en ce que les particules métalliques (5) sont intégrées de manière orientée dans le matériau composite particules-particules.
  16. Cathode à oxyde selon la revendication 1, caractérisée en ce que les particules métalliques (5) sont intégrées dans le matériau composite particules-particules verticalement par rapport à la surface de la base de cathode (2).
  17. Cathode à oxyde selon la revendication 1, caractérisée en ce que les particules métalliques (5) sont intégrées dans le matériau composite particules-particules avec un gradient de concentration.
  18. Tube cathodique équipé d'au moins une cathode à oxyde selon la revendication 1.
EP01980367A 2000-09-19 2001-09-11 Cathode a oxyde Expired - Lifetime EP1232511B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP01980367A EP1232511B1 (fr) 2000-09-19 2001-09-11 Cathode a oxyde

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
EP00308164 2000-09-19
EP00308164 2000-09-19
EP01201836 2001-05-02
EP01201836 2001-05-02
PCT/EP2001/010453 WO2002025681A1 (fr) 2000-09-19 2001-09-11 Tube cathodique a cathode a oxyde
EP01980367A EP1232511B1 (fr) 2000-09-19 2001-09-11 Cathode a oxyde

Publications (2)

Publication Number Publication Date
EP1232511A1 EP1232511A1 (fr) 2002-08-21
EP1232511B1 true EP1232511B1 (fr) 2007-08-15

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EP01980367A Expired - Lifetime EP1232511B1 (fr) 2000-09-19 2001-09-11 Cathode a oxyde

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US (1) US7019450B2 (fr)
EP (1) EP1232511B1 (fr)
JP (1) JP5048907B2 (fr)
KR (1) KR100867149B1 (fr)
CN (1) CN100336154C (fr)
AT (1) ATE370515T1 (fr)
DE (1) DE50112861D1 (fr)
WO (1) WO2002025681A1 (fr)

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KR100449759B1 (ko) * 2002-03-21 2004-09-22 삼성에스디아이 주식회사 전자관용 음극 및 그 제조방법
GB0230125D0 (en) * 2002-12-24 2003-01-29 Lg Philips Displays Netherland Oxide cathode
US20060068196A1 (en) * 2004-09-24 2006-03-30 Kabushiki Kaisha Toshiba High-frequency magnetic material, producing method for the same and high-frequency magnetic device
DE102008020164A1 (de) * 2008-04-22 2009-10-29 Siemens Aktiengesellschaft Kathode mit einem Flachemitter
CN101447376B (zh) * 2008-12-31 2010-09-01 北京工业大学 Y2O3-Lu2O3体系复合稀土-钼电子发射材料及其制备方法
CN103050347A (zh) * 2011-10-13 2013-04-17 中国科学院电子学研究所 一种制备镍钪海绵氧化物阴极的方法
CN103700557B (zh) * 2013-12-24 2016-03-30 北京工业大学 一种碳化稀土氧化镥掺杂钼阴极材料及其制备方法
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EP1232511A1 (fr) 2002-08-21
CN100336154C (zh) 2007-09-05
WO2002025681A1 (fr) 2002-03-28
ATE370515T1 (de) 2007-09-15
KR20020053863A (ko) 2002-07-05
JP5048907B2 (ja) 2012-10-17
DE50112861D1 (de) 2007-09-27
US20020163308A1 (en) 2002-11-07
JP2004510291A (ja) 2004-04-02
CN1395737A (zh) 2003-02-05
KR100867149B1 (ko) 2008-11-06
US7019450B2 (en) 2006-03-28

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