EP0142202A1 - Hochdruckgasentladungslampe - Google Patents
Hochdruckgasentladungslampe Download PDFInfo
- Publication number
- EP0142202A1 EP0142202A1 EP84201589A EP84201589A EP0142202A1 EP 0142202 A1 EP0142202 A1 EP 0142202A1 EP 84201589 A EP84201589 A EP 84201589A EP 84201589 A EP84201589 A EP 84201589A EP 0142202 A1 EP0142202 A1 EP 0142202A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- metal
- granules
- ceramic
- sinter
- current lead
- 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.)
- Granted
Links
- 229910052751 metal Inorganic materials 0.000 claims abstract description 62
- 239000002184 metal Substances 0.000 claims abstract description 62
- 239000008187 granular material Substances 0.000 claims abstract description 56
- 239000000919 ceramic Substances 0.000 claims abstract description 33
- 229910010293 ceramic material Inorganic materials 0.000 claims abstract description 12
- 239000004020 conductor Substances 0.000 claims description 30
- 239000002923 metal particle Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 description 31
- 238000005245 sintering Methods 0.000 description 12
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 11
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 8
- 239000011195 cermet Substances 0.000 description 7
- 239000002245 particle Substances 0.000 description 7
- 239000007789 gas Substances 0.000 description 6
- 239000000395 magnesium oxide Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 239000000470 constituent Substances 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 239000000725 suspension Substances 0.000 description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 4
- 238000007792 addition Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910052758 niobium Inorganic materials 0.000 description 3
- 239000010955 niobium Substances 0.000 description 3
- FVAUCKIRQBBSSJ-UHFFFAOYSA-M sodium iodide Chemical compound [Na+].[I-] FVAUCKIRQBBSSJ-UHFFFAOYSA-M 0.000 description 3
- 229910052721 tungsten Inorganic materials 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 159000000003 magnesium salts Chemical class 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 2
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000002223 garnet Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- -1 magnesium aluminate Chemical class 0.000 description 1
- YIXJRHPUWRPCBB-UHFFFAOYSA-N magnesium nitrate Inorganic materials [Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YIXJRHPUWRPCBB-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000009996 mechanical pre-treatment Methods 0.000 description 1
- QKEOZZYXWAIQFO-UHFFFAOYSA-M mercury(1+);iodide Chemical compound [Hg]I QKEOZZYXWAIQFO-UHFFFAOYSA-M 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- QGLKJKCYBOYXKC-UHFFFAOYSA-N nonaoxidotritungsten Chemical compound O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1 QGLKJKCYBOYXKC-UHFFFAOYSA-N 0.000 description 1
- 238000013001 point bending Methods 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 235000009518 sodium iodide Nutrition 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- CMJCEVKJYRZMIA-UHFFFAOYSA-M thallium(i) iodide Chemical compound [Tl]I CMJCEVKJYRZMIA-UHFFFAOYSA-M 0.000 description 1
- 229910001930 tungsten oxide Inorganic materials 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/36—Seals between parts of vessels; Seals for leading-in conductors; Leading-in conductors
- H01J61/361—Seals between parts of vessel
- H01J61/363—End-disc seals or plug seals
Definitions
- the invention relates to a high-pressure gas discharge lamp provided with a translucent tubular ceramic lamp vessel which is sealed in a vacuum-tight manner, which accommodates a pair of electrodes and an ionizable gas filling, and which is provided at its ends with current lead-in conductors each connected to a respective electrode and to a respective external current conductor, at least one current lead-in conductor consisting of an electrically conducting sinter body which contains metal particles between ceramic granules.
- a lamp is known from US Patent No. 4,155,758.
- Ceramic lamp vessels are used in lamp types in which during operation the lamp vessel is given a very high temperature, for example 900 C or higher.
- high-pressure sodium discharge lamps and high-pressure mercury discharge lamps with halide additions are mentioned.
- the term "ceramic lamp vessels” is to be understood to mean herein lamp vessels which comprise monocrystalline or polycrystalline material, such as, for example, translucent gas-tight aluminium oxide, magnesium aluminate, yttrium oxide, yttrium aluminium garnet and sapphire.
- the polycrystalline material may contain one or more additions which infuence the sintering process by which the lamp vessel is formed, for example in the case of aluminium oxide: magnesium oxide and/or yttrium oxide in a quantity of a few hundredths of a per cent.
- a so-called cermet is used as current lead-in member.
- the ceramic granules of the cermet may consist of the same or of a similar material as the lamp vessel.
- the metal with its deviating coefficient of thermal expansion is present, dispersed between these granules, in a given volume fraction.
- conducting cermets according to this Patent Specification as the dimensions of the ceramic granules are larger, the volume fraction of metal can be smaller. Nevertheless, at least 4.5 % by volume of metal has to be present to obtain a conducting cermet even with the use of large granules (400-800 / um). In the said Specification it is therefore pointed out that fine ceramic particles have to be avoided in order to utilize the metal powder to the optimum.
- the ceramic granules are coated with a uniform layer of metal powder.
- the coating layers together constitute a separate continuous phase which has the form of a three-dimensional network of metal and in which the ceramic granules are dispersed as a discontinuous phase. If the ceramic granules are small or if fine particles are present between the ceramic granules, the same volume of ceramic material requires a larger quantity of metal powder to provide the ceramic grains with a uniform coating of metal powder.
- the invention has for its object to provide a lamp of the kind described in the opening paragraph, in which the sinter body of the current lead-in conductor(s) has a high conductivity, even with the use of comparatively small granules and a small volume fraction of metal particles, and a great strength.
- the sinter body of the current lead-in conductor contains ceramic granules, which are embedded in an electrically conducting mass of interlocking networks of ceramic material and metal respectively.
- the volume fraction of metal of the sinter body is small and much smaller than that of the conducting mass.
- the sinter body consequently behaves in thermal respects (thermal conductivity and coefficient of thermal expansion) substantially like ceramic material, while it has in electrical respects the properties of metal.
- the continuous conducting phase in the current lead-in conductors of the lamp according to the invention does not consist entirely nor substantially entirely of metal, but only for a given volume fraction.
- This fraction generally lies between 15 and 60 %, mostly between 20 and 50 %.
- this conducting phase can be up to five to six times as voluminous as the quantity of metal incorporated therein, in this conducting phase, whilst maintaining a high conductivity, a larger volume of ceramic granules can be incorporated than when the conducting phase consists of the same quantity of unmixed metal, as is the case according to the said US Patent Specification.
- the sinter body in the lamp according to the invention can contain a very small volume fraction of metal but nevertheless can have a very high conductivity.
- the volume fraction of the metal in the continuous conducting phase is 30 ⁇ 5 %.
- the volume fraction of metal in the continuous conducting phase is so low that the volume of this phase is about three to four times larger than the volume of the quantity of metal incorporated therein, and as a result a large volume of granules can be incorporated therein.
- the volume fraction of metal in the continuous conducting phase is still so large that the sinter bodies obtained have a very low resistivity combined with a very low volume fraction of metal in these bodies.
- volume fraction with respect to the sinter body of the lamp according to the invention is to be understood to mean: the ratio of the volume of a constituent, for example the metal, to the sum of the volumes of constituents, calculated to the theoretical densities of the pure constituents.
- granules having dimensions between 50 and 500 / um are used.
- the size of the granules in the lead-in conductor may cover this whole range or a sub-range therein, for example, the sub-range from 100 to 400 / um or the sub-range from 400 to 500 / um, or may have a very small spread and be, for example, 200 + 20 / um.
- the lower limit of the granule size is determined by practical possibilities to remove smaller granules during their manufacture and the upper limit is determined by the dimensions of current lead-in conductors.
- the smallest dimension of such a conductor should be a few times, for example five times, larger than the dimension of the largest granule after sintering.
- the volume fraction of granules in the sinter body may be very high and may amount to more than 95 %.
- the dimensions referred to are the dimensions of the granules used in the manufacture of sinter bodies. During sintering, about 40 % of linear shrinkage occurs, as a result of which granules used have a size of, for example, 400 - 500 / um in diameter ultimately have a size of about 240 to about 300 / um.
- the granules are coarse with respect to the metal powder from which the conducting network in the continuous phase of the sinter body is formed and are coarse with respect to the ceramic powder from which the ceramic network in the continuous phase of the sinter body is formed.
- metal powder is used therein, whose particles have a size lying between 0.1 and 10 / um.
- a powder is used having an average particle size lying between 0.4 and 1 / um.
- Metals which are particularly suitable to be used are W, Mo, Fe, Ta and Nb, as well as combinations thereof.
- For the ceramic network in the conducting phase use is advantageously made of powder having a specific surface area of about 6 - 30 m 2 Ig and a particle size of mainly about 0.3 / um.
- the sinter bodies of the current lead-in conductors may have a very low resistivity, which is measured in milliohm.cm, even with a very low volume fraction of metal of, for example, less than 1 % by volume.
- a directive for the smallest quantity of metal in sinter bodies required for electrical conductivity can be derived from Table 1.
- This Table shows the relation between this smallest quantity of metal, the volume fraction of metal in the continuous phase and the average size of the granules when metal powder having a particle size of about 0.4 / um and ceramic powder having a particle size of about 0.3 / um and a specific surface area of 30 m 2 /g are used.
- granule size is the size of the granules before sintering, that is to say before about 40 % of linear shrinkage due to sintering has occurred.
- the sinter bodies generally contain more than the minimum required quantity of metal.
- the difference in coefficient of expansion between the sinter body and the lamp vessel will also play an important part in chosing the volume fraction of metal in a sinter body. If the lamp vessel has a coefficient of expansion lying between that of the metal and that of the ceramic material of the sinter body, a large volume fraction of metal may be required to make the difference in coefficient of expansion between sinter body and lamp vessel very small.
- the sinter body may be manufactured inter alia as follows. Ceramic powder is suspended in water. A substance may then be added, which influences the later sintering step, such as MgO. Instead, a magnesium salt, such as the nitrate, may be added. Expressed as MgO, the addition amounts, for example, to 0.03 % by weight.
- the suspension is dried and the cake thus obtained is broken.
- the granulate is sieved to remove large lumps.
- the granules are sieved to isolate the desired sieve fraction.
- magnesium salts are converted into the oxide.
- Metal powder, or instead thereof metal oxide powder, and ceramic powder are mixed in a predetermined volume ratio. This can be effected in a very suitable manner by suspending the powders in a liquid, such as ethanol, which does not or substantially notgive rise to formation of lumps.
- a aubstance influencing the sintering step such as MgO
- MgO a aubstance influencing the sintering step
- the suspension is dried.
- the dry substance may be pulverized in a ball-mill.
- metal oxide powder is used, the powder is reduced, for example in the case of tungsten oxide, in hydrogen at about 700°C. From the resulting powder mixture, the conducting mass of interlocking networks of ceramic material and of metal, respectively, is obtained after sintering.
- the powder mixture is joined with the granules in a predetermined ratio and mixed therewith by rolling.
- the mixture is compressed, for example isostatically, at a final pressure between 0.5 and 2 kbar.
- the moulding obtained is sintered, for example after a mechanical pretreatment, in vacuo, in a neutral or in a reducing gas up to a temperature between about 1600 and 1800 °C.
- the metal powder in the granules does not contribute, however, to the electrical conductivity of the current lead-in conductor, but in fact increases the volume fraction of metal.
- sinter bodies having a strength of considerably less than 250 mn/m 2 are not vacuum-tight or do not remain so.
- the sinter bodies of the lamps according to the invention have a strength which is about 250 mn/m 2 or lies well over the said value and generally amounts to 300 - 400 mn/m 2 .
- This great strength is due to the structure of the sinter bodies in which in fact the ceramic granules of the discontinuous phase are in contact with the ceramic network of the continuous phase.
- numerous ceramic-ceramic bonds are obtained which anchor the continuous phase and the discontinuous phase to each other.
- the aforementioned comparatively low temperature of between 1600 and 1800 C for sintering the current lead-in conductor is consequently amply sufficient to obtain a great strength and a high degree of vacuum-tightness, but is on the other hand sufficiently low to prevent a strong grain growth. Therefore, it is not necessary that metal powder is incorporated in the granules of the sinter body.
- rupture surfaces of the sinter bodies according to the invention containing up to 35 % by volume of metal in the continuous phase have shown that these rupture surfaces extend straight through granules.
- the inner strength of the constituents of the sinter bodies is determinative of the strength of the sinter bodies.
- the known sinter bodies in which ceramic granules are incorporated in a continuous phase which is composed of metal powder. Cavities at one rupture surface then correspond to granules projecting from the other rupture surface.
- rupture surfaces are found to extend increasingly along granule surfaces.
- a transparent tubular ceramic lamp vessel 1 sealed in a vacuum-tight manner is arranged in an evacuated glass outer envelope 2 which is connected to a lamp cap 3.
- Terminal wires 4 and 5, which are electrically connected to the lamp cap 3, carry the lamp vessel 1,
- the terminal wire 5 is secured as an external conductor to a sleeve 6 of niobium, which acts as one of the current lead-in conductors, while the terminal wire 4 is connected to an external current conductor 8 which is connected to a sinter body 7 as current lead-in conductor.
- the current lead-in conductors 6 and 7 both carry a respective electrode located in the lamp vessel 1 and are therefore not visible.
- the lamp vessel has an ionizable gas filling consisting of 0.4 mg of indium, 17.5 mg of mercury, 3.7 mg of thallium iodide, 30 mg of sodium iodide, 2 mg of mercury iodide and argon at a pressure at room temperature of 5330 Pa.
- the lamp vessel 1 has at its end a ceramic disk 10, which is fixed in the lamp vessel by sintering.
- a sinter body 7 is connected in a vacuum-tight manner to the disk 10 by means of fusion joint material 13.
- the body 7, which acts as a current lead-in conductor is sintered, a tungsten electrode 11,12 and an external molybdenum current conductor 8 are fixed in this body 7 and electrically connected to each other by means of the sinter body 7.
- the lamp of Figures 1 and 2 can be operated vertically with the lamp cap 3 directed downwards.
- Examples of sinter bodies (7) are characterized in Table 2 by their properties.
- the sinter bodies were manufactured as follows: Al 2 O 3 powder having a specific surface area of 25 m2/g was suspended in water to which Mg(NO 3 ) 2 was added in a quantity corresponding to 250 ppm of MgO calculated with respect to A1203. The suspension was dried. The residue was broken and sieved through a sieve of 500 / um. The granulate was rolled in a ball-mill without balls and was then sieved to isolate the fraction stated in Table 1. The granules of this fraction were heated in air for 10 hours at 600°C and for 1 hour at 1200 °C. These granules serve for the discontinuous phase of the sinter bodies.
- Tungsten powder having a particle size of mainly 0.4 / um was suspended in ethanol and mixed with Al 2 O 3 powder of the said kind (containing 259 ppm of MgO) in a volume ratio yielding the metal fraction from column 3 of Table 1.
- the suspension was dried; the residue was pulverized in a ball-mill. This powder serves for the continuous conducting phase from interlocking networks of the relevant sinter bodies.
- the powder mixture and the granules were joined in such a ratio that the volume fraction of tungsten of column 2 of Table 1 is obtained therefrom.
- the powder mixture and the granules were mixed by rolling.
- the mixture was pressed isostatically at a final pressure of 1.6 kbar.
- the moulding obtained was treated mechanically to give it the correct shape and was provided with a current conductor and an electrode.
- the whole was sintered for 2 hours at 1700 °C.
Landscapes
- Vessels And Coating Films For Discharge Lamps (AREA)
- Compositions Of Oxide Ceramics (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL8303858 | 1983-11-10 | ||
NL8303858A NL8303858A (nl) | 1983-11-10 | 1983-11-10 | Hogedruk-gasontladingslamp. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0142202A1 true EP0142202A1 (de) | 1985-05-22 |
EP0142202B1 EP0142202B1 (de) | 1988-06-01 |
Family
ID=19842693
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19840201589 Expired EP0142202B1 (de) | 1983-11-10 | 1984-11-05 | Hochdruckgasentladungslampe |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0142202B1 (de) |
JP (1) | JPH069135B2 (de) |
DE (1) | DE3471822D1 (de) |
HU (1) | HU189436B (de) |
NL (1) | NL8303858A (de) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2245557A (en) * | 1990-06-27 | 1992-01-08 | Johnson Matthey Plc | Metal-ceramic composites |
US5091674A (en) * | 1989-06-06 | 1992-02-25 | Siemens Aktiengesellschaft | Gas discharge lamp with glass tube and seal members |
EP0528428A1 (de) * | 1991-08-20 | 1993-02-24 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Hochdruckentladungslampe und Verfahren zur Herstellung |
EP0597679A1 (de) * | 1992-11-13 | 1994-05-18 | General Electric Company | Vorrichtung zur Herstellung und Abdichtung einer Lampenstromzuführung und Verfahren zu deren Herstellung |
US5455480A (en) * | 1992-12-14 | 1995-10-03 | Patent-Treuhand-Gesellschaft F. Elektrische Gluehlampen Mbh | High-pressure discharge lamp with ceramic discharge vessel and ceramic sealing means having lead-through comprising thin wires having a thermal coefficient of expansion substantially less than that of the ceramic sealing means |
WO1999041761A1 (en) * | 1998-02-11 | 1999-08-19 | General Electric Company | Monolithic seal for sapphire ceramic metal halide lamp |
EP0981151A1 (de) * | 1998-03-09 | 2000-02-23 | Ushio Denki Kabushiki Kaisha | Cermet fur eine lampe und keramische entladungslampe |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3686286B2 (ja) * | 1999-06-25 | 2005-08-24 | 株式会社小糸製作所 | アークチューブおよびその製造方法 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4155758A (en) * | 1975-12-09 | 1979-05-22 | Thorn Electrical Industries Limited | Lamps and discharge devices and materials therefor |
EP0028885A1 (de) * | 1979-11-12 | 1981-05-20 | Thorn Emi Plc | Elektrisch leitfähiges Cermet, seine Herstellung und Verwendung |
-
1983
- 1983-11-10 NL NL8303858A patent/NL8303858A/nl not_active Application Discontinuation
-
1984
- 1984-11-05 EP EP19840201589 patent/EP0142202B1/de not_active Expired
- 1984-11-05 DE DE8484201589T patent/DE3471822D1/de not_active Expired
- 1984-11-06 HU HU411684A patent/HU189436B/hu unknown
- 1984-11-07 JP JP23336384A patent/JPH069135B2/ja not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4155758A (en) * | 1975-12-09 | 1979-05-22 | Thorn Electrical Industries Limited | Lamps and discharge devices and materials therefor |
EP0028885A1 (de) * | 1979-11-12 | 1981-05-20 | Thorn Emi Plc | Elektrisch leitfähiges Cermet, seine Herstellung und Verwendung |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5091674A (en) * | 1989-06-06 | 1992-02-25 | Siemens Aktiengesellschaft | Gas discharge lamp with glass tube and seal members |
GB2245557A (en) * | 1990-06-27 | 1992-01-08 | Johnson Matthey Plc | Metal-ceramic composites |
EP0528428A1 (de) * | 1991-08-20 | 1993-02-24 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Hochdruckentladungslampe und Verfahren zur Herstellung |
US5404078A (en) * | 1991-08-20 | 1995-04-04 | Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh | High-pressure discharge lamp and method of manufacture |
EP0597679A1 (de) * | 1992-11-13 | 1994-05-18 | General Electric Company | Vorrichtung zur Herstellung und Abdichtung einer Lampenstromzuführung und Verfahren zu deren Herstellung |
US5455480A (en) * | 1992-12-14 | 1995-10-03 | Patent-Treuhand-Gesellschaft F. Elektrische Gluehlampen Mbh | High-pressure discharge lamp with ceramic discharge vessel and ceramic sealing means having lead-through comprising thin wires having a thermal coefficient of expansion substantially less than that of the ceramic sealing means |
WO1999041761A1 (en) * | 1998-02-11 | 1999-08-19 | General Electric Company | Monolithic seal for sapphire ceramic metal halide lamp |
US6126889A (en) * | 1998-02-11 | 2000-10-03 | General Electric Company | Process of preparing monolithic seal for sapphire CMH lamp |
US6274982B1 (en) | 1998-02-11 | 2001-08-14 | General Electric Company | Monolithic seal for sapphire CMH lamp |
EP0981151A1 (de) * | 1998-03-09 | 2000-02-23 | Ushio Denki Kabushiki Kaisha | Cermet fur eine lampe und keramische entladungslampe |
EP0981151A4 (de) * | 1998-03-09 | 2006-08-02 | Ushio Electric Inc | Cermet fur eine lampe und keramische entladungslampe |
Also Published As
Publication number | Publication date |
---|---|
EP0142202B1 (de) | 1988-06-01 |
DE3471822D1 (en) | 1988-07-07 |
JPS60119068A (ja) | 1985-06-26 |
HUT35877A (en) | 1985-07-29 |
HU189436B (en) | 1986-07-28 |
JPH069135B2 (ja) | 1994-02-02 |
NL8303858A (nl) | 1985-06-03 |
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