EP0982758A2 - Lampe à décharge et electrode pour ladite lampe - Google Patents

Lampe à décharge et electrode pour ladite lampe Download PDF

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Publication number
EP0982758A2
EP0982758A2 EP99116573A EP99116573A EP0982758A2 EP 0982758 A2 EP0982758 A2 EP 0982758A2 EP 99116573 A EP99116573 A EP 99116573A EP 99116573 A EP99116573 A EP 99116573A EP 0982758 A2 EP0982758 A2 EP 0982758A2
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EP
European Patent Office
Prior art keywords
container
electron emission
component
electrode
discharge lamp
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99116573A
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German (de)
English (en)
Other versions
EP0982758A3 (fr
Inventor
Munemitsu Hamada
Akira Takeishi
Makoto Takahashi
Masatada Yodogawa
Hiraku Harada
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TDK Corp
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TDK Corp
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Filing date
Publication date
Application filed by TDK Corp filed Critical TDK Corp
Publication of EP0982758A2 publication Critical patent/EP0982758A2/fr
Publication of EP0982758A3 publication Critical patent/EP0982758A3/fr
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/06—Main electrodes
    • H01J61/09—Hollow cathodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature

Definitions

  • the invention relates to an electrode for discharge lamp and a discharge lamp having the electrode to be used to a back light of a liquid crystal display apparatus, a fluorescent lamp of electric bulb or a small sized fluorescent discharge lamp to be employed as a reading light source of facsimile or scanner.
  • the fluorescent lamps are classified into a hot cathode fluorescent lamp utilizing arc discharge by thermo electron emission and a cold cathode fluorescent lamp utilizing glow discharge by secondary electron emission. Since the hot cathode fluorescent lamp is smaller in cathode drop voltage than the cold cathode fluorescent lamp, luminous efficiency is high to voltage. In addition, since the hot cathode fluorescent lamp makes use of the thermoelectron emission and it may take largely current density, it is easier to make high bright intensity in comparison with the cold cathode fluorescent lamp. The hot cathode fluorescent lamp is therefore suited to the light sources requiring much light flux such as the back light of the liquid crystal display of large area, the fluorescent lamp of electric bulb, the light sources for reading of facsimiles or scanners.
  • the conventional electrode for the hot cathode fluorescent lamp known is, for example, a fluorescent lamp coated with alkaline earth metal containing parts of transition metal and barium (Ba) in a tungsten coil (JP-A-59-75553).
  • the electrode described in the same starts the thermoelectron emission, it needs a preheating, and it is difficult to make the electrode capillary as the cold cathode fluorescent lamp. So, it is not easy to utilize the electrode to the liquid crystal display for note personal computers being demanded to be thin type and light weight, and unsuitable to miniaturize the fluorescent lamp of electric bulb.
  • an electrode having a structure not needing a preheating for making capillary is disclosed in JP-A-4-73853 where a double coil of tungsten is adhered with an emitter substance composed of oxides of barium, calcium and strontium.
  • a discharge lamp using the electrode of this structure Hg ion or rare gas ion generated during discharging collide with the electrode and spatter electron emission substances, and so-called ion spattering is remarkably caused.
  • the ion spattering is remarkable, the electron emission substances are exhausted, and a stable arc discharge cannot be kept for a long period of time.
  • U.S. Patent No.2,686,274 describes rod shaped electrodes made semiconductive by a reducing treatment of ceramics as Ba 2 TiO 4 . But the electrodes of the ceramic semiconductor of this structure are involved with problems that they are weak against thermal shocks, easily deteriorated by spattering by Hg ion or rare gas ion, or the current density is small.
  • the electrode of this structure has characteristics that the pre-heating is not necessary, making capillary is possible, and a life is long because of suppressing deterioration by ion spattering or evaporation. But, for not necessitating exchange of the back light of the liquid crystal display, the life of the electrode must be longer than that of a machinery mounted with the display, and for aiming at this object, the life of the electrode should be further increased. If the fluorescent discharge lamp is considerably deteriorated by frequently repeating ON and OFF, and the life is accordingly very shortened, and for substituting an incandescent lamp, the shortening of life by repeating ON and OFF must be avoided.
  • the object as mentioned above can be accomplished by any of the following (1) to (8).
  • the inventors ascertained that the ion spattering of the electrode in the hot cathode fluorescent lamp was remarkably generated at a time of the glow discharging, and found that a rapid shifting from the glow discharge to the arc discharge was possible by applying the invention they accomplished.
  • the container sufficiently serves as an electric conductive path, and the generation of unstable discharge at the end face of the opening of the container is controlled, and a stable arc spot may be instantly formed at the exposed face of the electron emission materials. Therefore, it is possible to instantly shift from the glow discharge to the arc discharge.
  • the electron emission materials are made porous ones having percentage of void being 45% or more, since the heat conductivity is critically lowered, temperature is partially increased, and the rapid shift from the glow discharge to the arc discharge is enabled. If the percentage of void is too high, the electron emission material is dropped during discharging to shorten the life of the hot cathode fluorescent lamp, but if it is controlled to be 80% or less, the electron emission material is prevented from dropping, so that the long life is not impeded by shortening the glow discharge.
  • the invention enables to considerably check the weakening of the electrode caused at turning on, and is especially effective when the number of the glow discharging is made much by frequently repeating ON and OFF.
  • Fig.1 illustrates an example of composing the electrode for the discharge lamp of the invention.
  • the instant electrode for discharge lamp comprises a cylindrical container 1 opening one end and electron emission materials 2 held therein.
  • ions as Hg ion or other generated in company with discharging fly from a direction of an opposite electrode and collide with the electrode but at this time the ions are intercepted by the container 1 and the number of the ions colliding with the electron emission materials 2 is lessened.
  • the container 1 prevents spattering of the electron emission materials 2 by the ions and serves as an electric conductive path for supplying current to the electron emission materials 2.
  • the inventive container 1 and the electron emission materials 2 are each main elements of compound oxides or compound oxides containing nitrogen, and contain, as metallic elemental components, a first component comprising at least one kind of Ba, Sr and Ca, a second component comprising at least one kind of Zr and Ti, and a third component comprising at least one kind of Ta and Nb.
  • the compound containing the first component is an electron emission component of low work function.
  • the second component is a component necessary for making the electron emission materials have high melting points.
  • Ti and of the second component and the third component are supply sources of compounds composing later mentioned spattering prevention layers. If the container 1 is composed of materials of the same family as the electron emission materials 2, both can be firmly combined electrically and mechanically.
  • the first, second and third components compose the compound oxides or the compound oxides containing nitrogen.
  • the first component is expressed with M I
  • the second component is expressed with M II
  • the third component is expressed with M III
  • the atomic ratio of the first component is X
  • the atomic ratio of the second component is Y
  • the atomic ratio of the third component is Z for the total of the first and second and third components, preferably, 0.8 ⁇ X/(Y+Z) ⁇ 2.0 0.05 ⁇ Y ⁇ 0.6 0.4 ⁇ Z ⁇ 0.95, and more preferably, 0.8 ⁇ X/(Y+Z) ⁇ 1.6 0.1 ⁇ Y ⁇ 0.4 0.6 ⁇ Z ⁇ 0.9. If X/(Y+Z) is too small, the first component is early exhausted by discharging.
  • the electron emission material is porous. Being porous, the heat conductivity may be reduced, and part of temperature easily goes up, so that it is easy to shift from the glow discharge to the arc discharge and to maintain the arc discharge stable.
  • the percentage of voids is preferably 45 to 80%, and more preferably 55 to 75%. If the percentage is too low, a heat reserving effect enough for emitting thermoelectron cannot be provided, and it is difficult or probably impossible to shift from the glow discharge to the arc discharge. On the other hand, however, if the percentage of voids is too high, the electron emission material is easy to drop during discharging, resulting in short life of the electrode.
  • the porous electron emission material is produced, for example as later mentioned, by not compression-forming but calcining the temporarily baked granular substances.
  • the electron emission materials produced by this process show properties that grains combining other grains with at least one part assemble, and shapes of grains are generally irregular, spherical or acicular.
  • one grain surface of plural grains is a discharging face, which plural grains exist in the surface (exposed face) at the opening side of the container.
  • An average radius of curvature in the discharging face that is, an average radius of curvature of grain existing at the exposed face is preferably 10 to 150 ⁇ m, and more preferably 20 to 100 ⁇ m.
  • the radius of curvature when grains are irregular is a radius of circumscribing circle of said grain.
  • the radius of curvature of the discharging face can be sought by photographs of the electrode in cross section of a scanning type electron microscope. By determining the radius of curvature of the discharging face in the above scope, the maintenance of the stable arc discharge is made easy. If the arc discharging is not stable, voltage variation and temperature variation are caused in the electrode, so that the life of the electrode is shortened. If determining the radius of curvature in the above scope, it is especially effective when lamp current is 5 to 500mA. Since the smaller the lamp current, the smaller the preferable average radius of curvature of the discharging face, a concrete and average radius of curvature may be selected appropriately from the above scope in response to the lamp current. If the lamp current is 5mA or more, it is generally sufficient for emitting thermoelectron, and when applying to a capillary lamp of 10mm or less in tube diameter, the lamp current is generally made 500mA or less.
  • the container may be of any shape if it is cylindrical, opening at one end and having a bottom, and is not limited to special sizes in response to the diameter of the lamp.
  • the electrode of the invention is particularly suited to capillary lamps, and so the container has preferably a maximum diameter of 1 to 5mm, length of 0.5 to 5mm, thickness of a side wall of 0.2 to 1mm, and thickness of a bottom of 0.2 to 2mm.
  • carbides containing at least one kind of Ta, Nb and Ti and/or nitrides exist.
  • the carbides and/or nitrides compose spattering prevention layers for protecting the electron emission materials from ions flying to the electrode. Since the first component should be exposed to the exposed face of the electron emission materials, the spattering prevention layer must be porous or networked films in the at least face of the electron emission materials. Thickness of the spattering prevention layer is preferably around 3 to 10 ⁇ m. Being too thin, the preventing effect is insufficient. But being too thick, it is difficult to expose the electron emission materials.
  • the carbides and/or nitrides may exist at other than the exposed face of the electron emission materials, and further may exist other than the end face of the opening side of the container.
  • the carbides and nitrides for composing the spattering prevention layers are better in the electric conductivity than the container composing material.
  • specific resistance in the surface can be 10 to 500 ⁇ cm
  • the container can be sufficiently functioned as the electric conductive path.
  • Electric supply to the electrode for discharge lamp of the invention is generally carried out through the outside and/or the bottom of the container other than the end face at the opening side thereof, and it is preferable that carbides and/or nitrides also exist at the outside and/or the bottom of the container.
  • the carbides and/or nitrides containing at least one kind of Ta, Nb and Ti contained in the spattering prevention layer may be allowed nitrides or carbides containing components of a plurality of metallic elements or solid solutions containing together carbon and nitrogen.
  • the content percentage of the first component at the exposed faces 2a of the electron emission materials seen from the opening side of the container is higher than the content percentage of the first component at the end face 1a of the opening side of the container.
  • the content percentage of the first component at the exposed faces 2a of the electron emission materials is larger than 1.2 times of the content percentages of the first component at the end face 1a of the opening side of the container.
  • a first instrument there may be enumerated a method for differing a composition of raw materials for the container and a composition of raw materials for electron emission materials.
  • a second instrument a method may be recommended which makes different compositions of the spattering prevention layer in the surface of the container and the surface of the electron emission material.
  • a third instrument a further method may be proposed which makes different opening rates of the spattering prevention layer of porous or networked films in the surface of the container and in the surface of the electron emission material.
  • the container and the electron emission materials may be of the same composition. Two or more of the first to third instruments may be used jointly.
  • the content percentage of the first component in the exposed faces of the electron emission materials seen from the opening side of the container and the content percentage of the first component in the end face of the opening side of the container can be measured by an electron-ray probe micro analysis (EPMA).
  • EPMA electron-ray probe micro analysis
  • an optional counting number is made a threshold value for each element, and assuming that the element exists in a range showing a count exceeding the threshold value, the content percentage of the first component is compared.
  • Fig.2 shows a producing process, and a basic flow of the process is similar to a process of manufacturing ordinary ceramics.
  • starting materials are weighed and mixed (Step S1) in response to compositions of the container and the electron emission materials.
  • Compounds to be used for the starting materials may be oxides or compounds to be oxides by baking, for example, carbonate or oxalate, and ordinarily for compounds containing the first component, BaCO 3 , SrCO 3 and CaCO 3 are preferably used, and for compounds containing the second component, ZrO 2 and TiO 2 are preferably used, and for compounds containing the third component, Ta 2 O 5 and Nb 2 O 5 are preferably used.
  • the mixture may depend upon any of a ball mill method, a friction mill method, a coprecipitation method or other.
  • the mixed starting material is preliminary baked (Step S2).
  • the preliminary baking conditions are not especially limited, and ordinarily 800 to 1300°C for 30 min. to 5 h.
  • the preliminary baking may be undertaken on powders or on formed body of powders.
  • the obtained pre-baked materials are ground by the ball mill method or an air grinding method (Steps S3), and powders of pre-baked materials are produced and granulated (Step S4) with an aqueous solution containing organic binders as polyvinyl alcohol, polyethylene glycol or polyethylene oxide.
  • the granulating means are not especially limited, and may depend upon, for example, a spray drying method, an extrusion granulating method, a roll granulating method or methods using mortar or pestle.
  • the percentage of voids of the electron emission materials can be controlled. Further, this percentage can be also controlled by adding organic high polymer compounds after granulating.
  • Granules for the container are compressed and formed into a container shaped configuration (Step S5). Pressure therefor is preferably 20 to 500Mpa.
  • granules for the electron emission materials are charged (Step S6). When charging, no pressure is preferably effected. In case of effecting pressure, destined voids cannot be formed in the electron emission materials, irrespective of amounts of binders and other high polymer compounds added when granulating, so that the heat reserving effect enough for emitting the thermoelectron cannot be available. Preheating is therefore necessary when starting the discharge.
  • the container and the granules charged therein are reduced and baked concurrently (Step S7) to turn out sintered products (electrode) (Step S8).
  • the baking atmosphere is a reducing gas as hydrogen or carbon monoxide, an inert gas as argon or nitrogen, or an inert or a neutral gases respectively containing neutral gas or reducing gas.
  • the density of the container after baking is preferably 60% or more of a theoretical density, especially 85% or more.
  • the density of the container is obtained from the dimension of the container, while the theoretical density is obtained from the crystalline structure.
  • the effects of the invention can be more improved by setting voids in the above said range in the electron emission materials as well as making the container close, and as later mentioned, generating amounts of carbides and nitrides in the surfaces of the container and the electron emission materials can be differed.
  • carbide For forming carbides in the electrode surfaces, it is sufficient to bake them in an atmosphere of inert or neutral gases respectively containing a gas of compound containing carbon. By insufficiently removing the binder when baking, carbide may be formed by supplying carbon from the binder or the organic high polymer compound. A further carbide may be also formed by using a baking furnace partially composed of carbon, introducing carbon powders or organic high polymer compounds into the furnace, or burying formed products in carbon powders or organic high polymer compounds. Two kinds or more of the above means may be jointly used. Among them, such a means is preferable, which feeds carbon from the atmosphere, the furnace materials or the carbon powders in the furnace. On the other hand, for forming nitrides in the electrode surfaces, it is sufficient to bake them in a nitrogen atmosphere or an atmosphere including compound containing nitrogen. By jointly using the carbide forming means, carbide and nitride can be formed.
  • the amount of carbides per unit area of the container surface is more than the amount of carbides per unit area in the surface of the electron emission materials.
  • the same is applicable to nitrides, because a formed product to be a container is pressed, while granules to be electron emission materials are not pressed.
  • Carbides and nitrides grow up from crystal grain boundaries of the container and the electron emission materials to cover crystal grains, and turn out films, and at this time, since the growing more rapidly progresses in the container formed under pressure, the area covered with carbides or nitrides is wider than that of the electron emission materials. Therefore, if both are of the same composition, the content percentage of the first component is higher in the container, and in the invention, both are of the same composition for saving the producing process.
  • the invention employs a vacuum deposition method or a spattering method so as to form the spattering prevention layer composed of carbides and/or nitrides in the electrode surface.
  • a vacuum deposition method or a spattering method so as to form the spattering prevention layer composed of carbides and/or nitrides in the electrode surface.
  • the baking temperature is desirably 1400 to 2000°C. Being too low, a generating reaction of compound oxide or compound oxide including nitride does not sufficiently progress, so that the electron emission materials are easily evaporated when turning on a light, and the formation of carbides or nitrides by the above means is difficult. In contrast, being too high, granules are molten, so that it is difficult to give desirable properties to the electron emission materials.
  • Fig.3 illustrates an example of composing the discharge lamp employing the electrode according to the present invention, and only shows vicinity near an end part of the tube.
  • the discharge lamp has a structure enabling to make the tube capillary.
  • the discharge lamp is coated with a fluorescent matter on the interior and has an airtight bulb 9.
  • the bulb 9 is sealed therein with a rare gas (at least one kind of He, Ne, Ar, Kr and Xe).
  • Pressure of the rare gas is preferably 1330 to 22600 Pa. By determining the pressure in this range, high bright and long life are available.
  • a lead wire 5 is inserted into an end of the bulb 9, and is formed with an enlarged part 6 thereof within the bulb 9.
  • the enlarged part 6 is connected with an electric conductive pipe 7. If this connection can be made with other means, the enlarged part 6 of the lead wire is not required.
  • the electric conductive pipe 7 is desirably composed of a material of high electric conductivity. If a material of less releasing gas, e.g., Ni is used, it is preferable as a generation of gas containing impurities is checked when making the discharge lamp.
  • the electric conductive pipe 7 may be composed of ceramic. Within the electric conductive pipe 7, the container 1 is disposed in contact therewith, and within the container 1, the electron emission materials 2 are filled up.
  • a metal pipe 4 filled with a mercury dispenser material 3 is provided between the container 1 in the conductive pipe 7 and the enlarged part 6 of the lead wire.
  • the metal pipe 4 is a cylindrical body opening both ends, and may be composed with a metal as Ni.
  • the electric conductive pipe 7 is formed with slit like openings (not shown) at the part thereof encircling the metal pipe 4.
  • the mercury in the mercury dispenser material 3 is evaporated by frequency heating to the metal pipe 4 and is released from the slit like openings to a discharge space 10 through between the metal pipe 4 and the enlarged part 6 of the lead wire and between the metal pipe 4 and container 1.
  • the opening is not limited to the slit but to any shape so far as it enables to release the evaporated mercury and does not hinder the holding of the container 1.
  • the mercury dispenser material 3 is not indispensable but may be composed to supply mercury into the bulb in a sealing process.
  • the inventive electrode is not limited to the discharge lamp composed as shown in Fig.3 but applicable to others, for example, various kinds of discharge lamps as already proposed in the above mentioned publications.
  • Ba was selected.
  • Zr was selected and as the third component, Ta was selected.
  • the mixture was dried and formed under pressure of 10Mpa.
  • the formed substance was temporarily baked at temperature of 1100°C for 2 hours in an air.
  • the obtained product was wet ground for 20 hours in the ball mill, dried, added with an aqueous solution containing polyvinylalcohol, pelletized with a mortar and a pestle, and granulated.
  • the granules for the container were formed under pressure of 200MPa to be a cylinder opening one end and closing another end (density: 3.6g/cm3).
  • granules for the electron emission materials were tilled up, baked at temperature of 1600°C for 2 hours in a carbon furnace of a nitrogen gas flow atmosphere, and turned out an electrode sample No.104 shown in Table 1.
  • the sample was sized to be 2.3mm of outer diameter, 1.7mm of inner diameter (diameter of the granule supporting part), and 1.7mm of length.
  • the density of the container was 6.8g/cm 3 being 90% or more of the theoretical density.
  • A designates the content percentage of the first component in exposed faces of the electron emission discharge materials seen from the opening side of the container
  • “B” is the content percentage of the first component in an end face of the opening side of the container.
  • the content percentage herein is meant by abundance ratio (area ratio) of the first component measured with EPMA.
  • the counting number was divided into seven levels with respect to elements to be measured, and it was judged that the elements existed in the area where the counting number was above a level 3. The level number dividing the counting number and a position determining a threshold level did not give influences a judgement as to whether A/B > 1 was satisfied or not.
  • FIGs.4 to 9 EPMA images used for measuring A/B are shown in Figs.4 to 9.
  • the electrodes are seen from the opening side of the container.
  • Figs.4 and 5 are respectively the Ba distribution and the Ta distribution of the sample No.104
  • Figs.6 and 7 are respectively the Ba distribution and the Ta distribution of the sample No.102
  • Figs.8 and 9 are respectively the Ba distribution and the Ta distribution of the sample No.101.
  • areas of high bright are areas high in the element density.
  • Fig.4 is the inventive sample where Ba in the container surface is less while Ba in the surface of the electron emission materials is more.
  • Fig.6 is a comparative sample where more Ba exists in not only the surface of the electron emission materials but also the container surface.
  • Fig.8 is also a comparative sample where Ba is less in the container surface and in the surface of the electron emission materials.
  • each of Figs.5, 7 and 9 shows that Ta exists in both.
  • the void percentages in Table 1 are those of the electron emission materials of the samples in cross section available in photographs of the scanning electron microscope. The void percentages were adjusted by filling the organic high polymer compound (phenol resin powder) in the formed body in addition to granules and controlling the filling amount.
  • Fig.10 shows a photograph of the scanning electron microscope in cross section parallel with an axial direction. It is seen from the same that the electron emission materials are acicular and unitary with the container. The average radius of curvature of the discharging surface of the samples were 10 to 50 ⁇ m.
  • the powder X-ray diffraction was undertaken.
  • the powder X-ray diffraction was carried out on the electrode samples produced in the same manner as the sample No.104 except at least partial changing of the compositions of the electron emission materials, the composition of the container and the baking conditions.
  • the composition of the container was crystal of at least one kind of Ba 7 Ta 6 O 22 , BaTaO 2 N, Ba 5 Ta 4 O 15 , Ba 6 ZrTa 4 O 18 and BaZrO 3 .
  • FIG. 13 shows a chart of a X-ray diffraction of composite oxide materials containing nitride.
  • Fig. 11 shows a chart of a X-ray diffraction of a material containing both of of composite oxide materials not containing nitride and composite oxide materials containing nitride.
  • Fig.16 shows that TaC film is formed on the sintered surface. Observing the TaC film by the scanning electron microscope, it was a crystal film. Measuring the specific resistance of the TaC film by a 4 terminal method, it was 60 to 180 ⁇ cm. Thickness was 3 to 5 ⁇ m.
  • Samples of the electrode were made in the same manner as the sample No.104 of the example 1 excepting that the void ratio is as shown in Table 2. In regard to them, the shift time TGA were monitored same as the example 1. Additionally, time duration of the arc discharge was monitored to check the life of arc discharge. Result is shown in Table 2.
  • Samples of the electrode were made in the same manner as the sample No.104 in Table 2 excepting that the average radius of curvature of the discharge face is as shown in Table 3.
  • the average radius of curvature of the discharge face was changed by classifying pelletized granules and controlling granular sizes.

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  • Discharge Lamp (AREA)
EP99116573A 1998-08-24 1999-08-24 Lampe à décharge et electrode pour ladite lampe Withdrawn EP0982758A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP25327798 1998-08-24
JP10253277A JP2000067810A (ja) 1998-08-24 1998-08-24 放電灯用電極および放電灯

Publications (2)

Publication Number Publication Date
EP0982758A2 true EP0982758A2 (fr) 2000-03-01
EP0982758A3 EP0982758A3 (fr) 2002-03-27

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EP99116573A Withdrawn EP0982758A3 (fr) 1998-08-24 1999-08-24 Lampe à décharge et electrode pour ladite lampe

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EP (1) EP0982758A3 (fr)
JP (1) JP2000067810A (fr)
KR (1) KR20000017442A (fr)
CN (1) CN1154151C (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1037244A2 (fr) * 1999-03-12 2000-09-20 TDK Corporation Matériau émetteur d'électrons et son procédé de préparation
WO2006048797A2 (fr) * 2004-11-02 2006-05-11 Koninklijke Philips Electronics N.V. Lampe a decharge, electrode et procede servant a fabriquer une partie electrode de lampe a decharge
US7633226B2 (en) 2005-11-30 2009-12-15 General Electric Company Electrode materials for electric lamps and methods of manufacture thereof

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100393045B1 (ko) * 2000-12-29 2003-07-31 삼성에스디아이 주식회사 형광체
JP4947465B2 (ja) * 2007-08-22 2012-06-06 ダイキョーニシカワ株式会社 コンソール

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0643416A1 (fr) * 1993-03-17 1995-03-15 TDK Corporation Materiau pour electrode de lampe a decharge, procede d'elaboration de ce materiau et electrode de lampe a decharge
WO1997048121A1 (fr) * 1996-06-12 1997-12-18 Tdk Corporation Lampe a decharge a cathode en ceramique

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0643416A1 (fr) * 1993-03-17 1995-03-15 TDK Corporation Materiau pour electrode de lampe a decharge, procede d'elaboration de ce materiau et electrode de lampe a decharge
WO1997048121A1 (fr) * 1996-06-12 1997-12-18 Tdk Corporation Lampe a decharge a cathode en ceramique

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1037244A2 (fr) * 1999-03-12 2000-09-20 TDK Corporation Matériau émetteur d'électrons et son procédé de préparation
EP1037244A3 (fr) * 1999-03-12 2003-01-08 TDK Corporation Matériau émetteur d'électrons et son procédé de préparation
WO2006048797A2 (fr) * 2004-11-02 2006-05-11 Koninklijke Philips Electronics N.V. Lampe a decharge, electrode et procede servant a fabriquer une partie electrode de lampe a decharge
WO2006048797A3 (fr) * 2004-11-02 2009-04-09 Koninkl Philips Electronics Nv Lampe a decharge, electrode et procede servant a fabriquer une partie electrode de lampe a decharge
US7633226B2 (en) 2005-11-30 2009-12-15 General Electric Company Electrode materials for electric lamps and methods of manufacture thereof

Also Published As

Publication number Publication date
CN1154151C (zh) 2004-06-16
JP2000067810A (ja) 2000-03-03
EP0982758A3 (fr) 2002-03-27
KR20000017442A (ko) 2000-03-25
CN1254938A (zh) 2000-05-31

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