EP0555755B1 - High pressure discharge lamp - Google Patents
High pressure discharge lamp Download PDFInfo
- Publication number
- EP0555755B1 EP0555755B1 EP93101665A EP93101665A EP0555755B1 EP 0555755 B1 EP0555755 B1 EP 0555755B1 EP 93101665 A EP93101665 A EP 93101665A EP 93101665 A EP93101665 A EP 93101665A EP 0555755 B1 EP0555755 B1 EP 0555755B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- discharge lamp
- high pressure
- pressure discharge
- shaft
- diameter
- 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.)
- Expired - Lifetime
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/04—Electrodes; Screens; Shields
- H01J61/06—Main electrodes
- H01J61/073—Main electrodes for high-pressure discharge lamps
- H01J61/0732—Main electrodes for high-pressure discharge lamps characterised by the construction of the electrode
Definitions
- the invention relates to a high-pressure discharge lamp with a metal halide fill according to the preamble of claim 1.
- Such a metal halide high-pressure discharge lamp for general lighting is known from DE-PS 27 18 527. Lamps of this type usually only have sufficient burning and ignition properties; in addition, a flicker of different intensity can occur after different burning times, which fluctuates greatly over time.
- Flicker is to be understood here to mean all fluctuations in luminance, which range from periodic flickering to aperiodic flickering. These fluctuations in luminance are summarized in one value, the flicker factor. Previous investigations have shown that there is a direct proportionality between the flicker factor and the direct voltage component of the lamp current. Technically, the flickering can be traced back to an insufficient electrode temperature, which manifests itself in the sheet jumping at different attachment points.
- the object of the invention is to provide a high-pressure discharge lamp with a metal halide filling, which shows a flicker that is reduced compared to the prior art, so that the lamp has good ignition and burning properties with stable lighting and electrical data over the life of the lamp .
- the tip of the electrode head is essentially spherical in the direction of the discharge arc, the jumping of the discharge arc from one to another starting point on the head part is greatly reduced.
- Essentially spherical here means that the tip of the electrode head can also have a shape slightly different from a sphere in the direction of an ellipsoidal or oval shape.
- the head part has good thermal contact with the spiral part, provided it is not fused with the last turn of the spiral part. The surface of the head part facing the discharge then does not experience any significant cooling during the power pauses and thus has a uniform temperature during operation.
- the surface of the substantially spherical The tip of the head part must not be too large, because otherwise - even though there is sufficient heat capacity - too much energy is emitted by radiation and the ignition and arc transfer are hindered by the strong cooling.
- the head part therefore advantageously consists of a ball which has a diameter between 1.5 and 2.5 times the shaft diameter or of a ball segment, the ball diameter of the ball segment corresponding to at least 3 times the diameter of the shaft.
- the helical part has 2 to 4 turns, the helical wire having a diameter that is between half and two thirds of the shaft diameter. If these characteristics are adhered to, there is an optimal sheet transfer with a flicker factor of less than 1%.
- FIG. 1 shows the structure of a 70 W high-pressure discharge lamp 1 according to the invention with a discharge vessel 2 made of quartz glass that is squeezed on one side, the latter being gas-tightly surrounded by an outer bulb 3 likewise squeezed on one side.
- the schematically illustrated electrodes 4, 4 '; 5 are squeezed into the discharge vessel 2 in a gas-tight manner via sealing foils 6, 7 made of molybdenum, and via current leads 8, 9, sealing foils 10, 11 of the outer bulb 3 and further — not visible here — short current leads with the electrical connection pins 12, 13 of the ceramic base 14 of the type G 12 connected.
- a getter material 16 is also attached to the pinch 15 of the discharge vessel 2 in a potential-free manner via a piece of wire on a metal plate.
- the discharge vessel contains metal iodides and bromides of the elements sodium, tin, thallium, indium and lithium.
- FIG. 2 shows the exact structure of an electrode 4 of the high-pressure discharge lamp according to FIG. 1.
- the electrode 4 (the structure of the second electrode is analog) has a shaft 17, one end of which is melted into the pinch 15 in a gas-tight manner via a molybdenum sealing film 6.
- the other end of the shaft 17 with a diameter of 0.4 mm is angled by 90 ° in the direction of the discharge arc.
- This end carries a spiral part 18 of 2.5 turns, which are wound tightly on the shaft end and consist of a wire of 0.2 mm in diameter.
- On the free tip of the Shaft 17 is melted a ball 19 with a 0.7 mm diameter, which bears firmly against the last turn of the helical part 18. All parts of the electrode 4 consist of undoped tungsten.
- FIG 3 shows, partially in section, the exact structure of another electrode design 4 'of the high-pressure discharge lamp according to Figure 1.
- the electrode 4' (the structure of the second electrode is analog) has a shaft 17 ', one end of which over the molybdenum sealing film 6 in the pinch 15 is melted gas-tight.
- the other end of the shaft 17 'with a diameter of 0.4 mm is angled by 90 ° in the direction of the discharge arc.
- This end carries a helical part 18 'of about 2.5 turns, which are wound tightly on the shaft end and consist of a wire of 0.4 mm in diameter.
- a head part in the form of a coupling 19 ' is melted, which has the shape of a spherical segment with a radius of 1.4 mm in the direction of the discharge arc.
- All electrode parts can consist of pure tungsten.
- the electrode shaft 17 'can also consist of a metal that melts at a lower temperature such as tungsten, e.g. Rhenium. In this case, it is necessary that both the helical part 18 'and the coupling 19' consist of pure or doped tungsten.
- the 150 W high-pressure discharge lamp 20 shown in FIG. 4 consists of a two-sided squeezed discharge vessel 21 made of quartz glass is enclosed by an outer bulb 22.
- the electrodes 23, 24 - shown schematically - are melted gas-tight into the discharge vessel 21 by means of foils 25, 26 and via current leads 27, 28, sealing foils 29, 30 of the outer bulb 22 and via further short current leads with the electrical connections of the ceramic base (R7s) 31 , 32 connected.
- a getter material 33 applied to a metal plate is additionally melted potential-free - via a piece of wire.
- the ends 34, 35 of the discharge vessel 21 are provided with a heat-reflecting coating.
- the discharge vessel 21 contains metal iodides and bromides of sodium, tin, thallium, indium and lithium as the filling.
- FIG. 5 shows an electrode 23, 24 as it is melted into the bruises 36 of the discharge vessel.
- the electrode 23, 24 has a straight shaft 37, one end of which is welded to the molybdenum sealing film 25, 26.
- the other end of the shaft 37 with a diameter of 0.5 mm carries a helical part 38, which consists of 2.5 turns of a wire of 0.3 mm diameter, which are wound tightly on the shaft 37.
- a ball 39 with a diameter of 1.0 mm is melted onto the tip of the shaft 37 facing the discharge, the helical part 38 abutting the ball 39 and thus having thermal contact with the ball 39.
- All parts of the electrode 23, 24 are made of undoped tungsten.
Landscapes
- Discharge Lamp (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
Description
Die Erfindung betrifft eine Hochdruckentladungslampe mit einer Metallhalogenidfüllung gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a high-pressure discharge lamp with a metal halide fill according to the preamble of claim 1.
Aus der DE-PS 27 18 527 ist eine solche Metallhalogenid-Hochdruckentladungslampe für die Allgemeinbeleuchtung bekannt. Lampen dieser Art besitzen meist nur ausreichende Brenn- und Zündeigenschaften; außerdem kann sich nach unterschiedlichen Brennzeiten ein verschieden starkes Flickern einstellen, das zeitlich stark schwankt.Such a metal halide high-pressure discharge lamp for general lighting is known from DE-PS 27 18 527. Lamps of this type usually only have sufficient burning and ignition properties; in addition, a flicker of different intensity can occur after different burning times, which fluctuates greatly over time.
Unter Flickern sind hierbei sämtliche Leuchtdichteschwankungen zu verstehen, die vom periodischen Flimmern bis zum aperiodischen Flackern reichen. Diese Leuchtdichteschwankungen werden in einem Wert, dem Flickerfaktor, zusammengefaßt. Bisherige Untersuchungen ergaben, daß zwischen dem Flickerfaktor und dem Gleichspannungsanteil des Lampenstroms eine direkte Proportionalität besteht. Technisch ist das Flickern auf eine ungenügende Elektrodentemperatur zurückzuführen, die sich in einem Springen des Bogens an unterschiedliche Ansatzstellen äußert.Flicker is to be understood here to mean all fluctuations in luminance, which range from periodic flickering to aperiodic flickering. These fluctuations in luminance are summarized in one value, the flicker factor. Previous investigations have shown that there is a direct proportionality between the flicker factor and the direct voltage component of the lamp current. Technically, the flickering can be traced back to an insufficient electrode temperature, which manifests itself in the sheet jumping at different attachment points.
Aufgabe der Erfindung ist es, eine Hochdruckentladungslampe mit einer Metallhalogenid-Füllung zu schaffen, die ein gegenüber dem Stand der Technik verringertes Flickern zeigt, so daß sich bei der Lampe gute Zünd- und Brenneigenschaften mit stabilen lichttechnischen und elektrischen Daten über die Lebensdauer der Lampe ergeben.The object of the invention is to provide a high-pressure discharge lamp with a metal halide filling, which shows a flicker that is reduced compared to the prior art, so that the lamp has good ignition and burning properties with stable lighting and electrical data over the life of the lamp .
Die Aufgabe wird bei der erfindungsgemäßen Hochdruckentladungslampe durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst. Weitere vorteilhafte Ausgestaltungen sind den Unteransprüchen zu entnehmen.The object is achieved in the high-pressure discharge lamp according to the invention by the characterizing features of claim 1. Further advantageous refinements can be found in the subclaims.
Durch die in Richtung Entladungsbogen im wesentlichen kugelförmige Spitze des Elektrodenkopfes wird das Springen des Entladungsbogens von einem zu einem anderen Ansatzpunkt auf dem Kopfteil sehr stark reduziert. Das Springen ist um so geringer, je glatter die Oberfläche des Kopfteils ist. Im wesentlichen kugelförmig bedeutet hierbei, daß die Spitze des Elektrodenkopfes auch eine von einer Kugel geringfügig abweichende Gestalt in Richtung einer ellipsoidförmigen oder ovalen Form aufweisen kann. Zur Erreichung einer größeren Masse des Elektrodenkopfes und damit einer höheren Wärmekapazität weist das Kopfteil - sofern es nicht mit der letzten Windung des Wendelteils verschmolzen ist - einen guten Wärmekontakt mit dem Wendelteil auf. Die der Entladung zugewandte Oberfläche des Kopfteils erfährt dann keine wesentliche Abkühlung während der Strompausen und besitzt somit im Betrieb eine gleichmäßige Temperatur.Because the tip of the electrode head is essentially spherical in the direction of the discharge arc, the jumping of the discharge arc from one to another starting point on the head part is greatly reduced. The smoother the surface of the headboard, the lower the jumping. Essentially spherical here means that the tip of the electrode head can also have a shape slightly different from a sphere in the direction of an ellipsoidal or oval shape. In order to achieve a larger mass of the electrode head and thus a higher heat capacity, the head part has good thermal contact with the spiral part, provided it is not fused with the last turn of the spiral part. The surface of the head part facing the discharge then does not experience any significant cooling during the power pauses and thus has a uniform temperature during operation.
Die Oberfläche der im wesentlichen kugelförmigen Spitze des Kopfteils darf nicht zu groß sein, da sonst - obwohl eine ausreichende Wärmekapazität vorliegt - zuviel Energie durch Strahlung abgegeben wird und durch die starke Abkühlung die Zündung und Bogenübernahme behindert wird. Vorteilhaft besteht daher das Kopfteil aus einer Kugel, die einen Durchmesser zwischen dem 1,5- und 2,5fachen des Schaftdurchmessers hat oder aus einem Kugelsegment, wobei der Kugeldurchmesser des Kugelsegments mindestens dem 3fachen Durchmesser des Schaftes entspricht. Das Wendelteil weist 2 bis 4 Windungen auf, wobei der Wendeldraht einen Durchmesser besitzt, der zwischen der Hälfte und zwei Drittel des Schaftdurchmessers liegt. Bei Einhaltung dieser Merkmale ergibt sich eine optimale Bogenübernahme mit einem Flickerfaktor kleiner 1 %.The surface of the substantially spherical The tip of the head part must not be too large, because otherwise - even though there is sufficient heat capacity - too much energy is emitted by radiation and the ignition and arc transfer are hindered by the strong cooling. The head part therefore advantageously consists of a ball which has a diameter between 1.5 and 2.5 times the shaft diameter or of a ball segment, the ball diameter of the ball segment corresponding to at least 3 times the diameter of the shaft. The helical part has 2 to 4 turns, the helical wire having a diameter that is between half and two thirds of the shaft diameter. If these characteristics are adhered to, there is an optimal sheet transfer with a flicker factor of less than 1%.
Die Erfindung ist anhand der nachfolgenden Figuren näher veranschaulicht.
- Figur 1
- zeigt den Aufbau einer erfindungsgemäßen Hochdruckentladungslampe mit einseitig gesockeltem Außenkolben
Figur 2- zeigt eine Elektrode der erfindungsgemäßen Hochdruckentladungslampe gemäß Figur 1
Figur 3- zeigt eine weitere Elektrodenausführung der erfindungsgemäßen Hochdruckentladungslampe gemäß Figur 1
Figur 4- zeigt den Aufbau einer erfindungsgemäßen Hochdruckentladungslampe mit zweiseitig gesockeltem Außenkolben
Figur 5- zeigt eine Elektrode der erfindungsgemäßen Hochdruckentladungslampe gemäß
Figur 4
- Figure 1
- shows the structure of a high-pressure discharge lamp according to the invention with an outer bulb base
- Figure 2
- shows an electrode of the high-pressure discharge lamp according to the invention according to FIG. 1
- Figure 3
- shows a further electrode design of the high-pressure discharge lamp according to the invention according to FIG. 1
- Figure 4
- shows the structure of a high-pressure discharge lamp according to the invention with a double-ended base bulb
- Figure 5
- shows an electrode of the high-pressure discharge lamp according to the invention according to FIG. 4
In Figur 1 ist der Aufbau einer erfindungsgemäßen 70 W-Hochdruckentladungslampe 1 mit einem einseitig gequetschten Entladungsgefäß 2 aus Quarzglas dargestellt, wobei letzteres von einem ebenfalls einseitig gequetschten Außenkolben 3 ebenfalls aus Quarzglas gasdicht umgeben ist. Die schematisch dargestellten Elektroden 4, 4′; 5 sind über Dichtungsfolien 6, 7 aus Molybdän in das Entladungsgefäß 2 gasdicht eingequetscht und über Stromzuführungen 8, 9, Dichtungsfolien 10, 11 des Außenkolbens 3 und weitere - hier nicht sichtbare - kurze Stromzuführungen mit den elektrischen Anschlußstiften 12, 13 des Keramiksockels 14 vom Typ G 12 verbunden. An der Quetschung 15 des Entladungsgefäßes 2 ist außerdem ein Gettermaterial 16 auf einem Metallplättchen - über ein Drahtstück - potentialfrei befestigt. Das Entladungsgefäß enthält als Füllung neben Quecksilber und einem Edelgas Metalljodide und -bromide der Elemente Natrium, Zinn, Thallium, Indium und Lithium.FIG. 1 shows the structure of a 70 W high-pressure discharge lamp 1 according to the invention with a
Figur 2 zeigt den genauen Aufbau einer Elektrode 4 der Hochdruckentladungslampe gemäß Figur 1. Die Elektrode 4 (der Aufbau der zweiten Elektrode ist analog) besitzt einen Schaft 17, dessen eines Ende über eine Molybdän-Dichtungsfolie 6 in die Quetschung 15 gasdicht eingeschmolzen ist. Das andere Ende des Schaftes 17 mit einem Durchmesser von 0,4 mm ist in Richtung des Entladungsbogens um 90° abgewinkelt. Dieses Ende trägt ein Wendelteil 18 aus 2,5 Windungen, die dicht auf das Schaftende gewickelt sind und aus einem Draht von 0,2 mm Durchmesser bestehen. Auf die freie Spitze des Schaftes 17 ist eine Kugel 19 mit 0,7 mm Durchmesser aufgeschmolzen, die fest an der letzten Windung des Wendelteils 18 anliegt. Sämtliche Teile der Elektrode 4 bestehen aus undotiertem Wolfram.FIG. 2 shows the exact structure of an
Figur 3 zeigt, teilweise geschnitten, den genauen Aufbau einer weiteren Elektrodenausführung 4′ der Hochdruckentladungslampe gemäß Figur 1. Die Elektrode 4′ (der Aufbau der zweiten Elektrode ist analog) besitzt einen Schaft 17′, dessen eines Ende über die Molybdän-Dichtungsfolie 6 in die Quetschung 15 gasdicht eingeschmolzen ist. Das andere Ende des Schaftes 17′ mit einem Durchmesser von 0,4 mm ist in Richtung des Entladungsbogens um 90° abgewinkelt. Dieses Ende trägt ein Wendelteil 18′ aus ca. 2,5 Windungen, die dicht auf das Schaftende gewickelt sind und aus einem Draht von 0,4 mm Durchmesser bestehen.Figure 3 shows, partially in section, the exact structure of another
Auf die dem Entladungsbogen zugewandte letzte Windung des Wendelteils ist ein Kopfteil in Form einer Verkuppung 19′ aufgeschmolzen, die in Richtung Entladungsbogen die Gestalt eines Kugelsegments mit einem Radius von 1,4 mm besitzt. Sämtliche Elektrodenteile können aus reinem Wolfram bestehen. Der Elektrodenschaft 17′ kann aber auch aus einem Metall bestehen, das bei einer niedrigeren Temperatur wie Wolfram schmilzt, z.B. Rhenium. In diesem Fall ist es erforderlich, daß sowohl das Wendelteil 18′ als auch die Verkuppung 19′ aus reinem oder dotiertem Wolfram bestehen.On the discharge arc facing the last turn of the helical part, a head part in the form of a coupling 19 'is melted, which has the shape of a spherical segment with a radius of 1.4 mm in the direction of the discharge arc. All electrode parts can consist of pure tungsten. The electrode shaft 17 'can also consist of a metal that melts at a lower temperature such as tungsten, e.g. Rhenium. In this case, it is necessary that both the helical part 18 'and the coupling 19' consist of pure or doped tungsten.
Die in Figur 4 dargestellte 150 W-Hochdruckentladungslampe 20 besteht aus einem zweiseitig gequetschten Entladungsgefäß 21 aus Quarzglas, das von einem Außenkolben 22 umschlossen ist. Die Elektroden 23, 24 - schematisch dargestellt - sind mittels Folien 25, 26 gasdicht in das Entladungsgefäß 21 eingeschmolzen und über Stromzuführungen 27, 28, Dichtungsfolien 29, 30 des Außenkolbens 22 und über weitere kurze Stromzuführungen mit den elektrischen Anschlüssen der Keramiksockel (R7s) 31, 32 verbunden. In eine Quetschung des Entladungsgefäßes 21 ist zusätzlich - über ein Drahtstück - ein auf einem Metallplättchen aufgebrachtes Gettermaterial 33 potentialfrei eingeschmolzen. Die Enden 34, 35 des Entladungsgefäßes 21 sind mit einem wärmereflektierenden Belag versehen. Als Füllung enthält das Entladungsgefäß 21 neben Quecksilber und einem Edelgas Metalljodide und -bromide von Natrium, Zinn, Thallium, Indium und Lithium.The 150 W high-
Figur 5 zeigt eine Elektrode 23, 24, wie sie in die Quetschungen 36 des Entladungsgefäßes eingeschmolzen ist. Die Elektrode 23, 24 besitzt einen geraden Schaft 37, dessen eines Ende mit der Molybdän-Dichtungsfolie 25, 26 verschweißt ist. Das andere Ende des Schaftes 37 mit einem Durchmesser von 0,5 mm trägt ein Wendelteil 38, das aus 2,5 Windungen eines Drahtes von 0,3 mm Durchmesser besteht, die dicht auf den Schaft 37 gewickelt sind. Auf die der Entladung zugewandten Spitze des Schaftes 37 ist eine Kugel 39 mit einem Durchmesser von 1,0 mm aufgeschmolzen, wobei das Wendelteil 38 an der Kugel 39 anliegt und somit thermischen Kontakt mit der Kugel 39 besitzt. Sämtliche Teile der Elektrode 23, 24 sind aus undotiertem Wolfram gefertigt.FIG. 5 shows an
Claims (8)
- High pressure discharge lamp (1; 20) having a power less than or equal to 400 W, the discharge vessel (2; 21) of which contains a filling of mercury, metal halides and at least one noble gas, and into which vessel two electrodes (4, 4′, 5; 23, 24) are pinched, via sealing foils (6, 7; 25, 26), in a gas-tight manner, each electrode (4, 4′, 5; 23, 24) having the following features:- the electrode (4, 4′, 5; 23, 24) has a shaft (17, 17′; 37), of which the free end faces the discharge arc- a filament part (18, 18′; 38) having closely adjacent windings is plugged onto that end of the electrode shaft (17, 17′; 37) which faces the discharge arc,characterized in that a solid top part, which has an essentially spherical shape, at least in the direction of the discharge arc, is fused onto that end of the electrode shaft (17, 17′; 37) which faces the discharge arc and/or onto the last winding, facing the discharge arc, of the filament part (18′).
- High pressure discharge lamp according to Claim 1, characterized in that the top part has close thermal contact with the filament part (18, 18′; 38).
- High pressure discharge lamp according to Claim 1, characterized in that the top part comprises a sphere (19; 39), the diameter of which is between 1.5 and 2.5 times the diameter of the shaft (17; 37).
- High pressure discharge lamp according to Claim 1, characterized in that the top part essentially comprises a segment of a sphere (19′), the sphere diameter of the segment of a sphere (19′) corresponding to at least 3 times the diameter of the shaft (17).
- High pressure discharge lamp according to Claim 1, characterized in that the wire of the filament part (18, 18′; 38) has a diameter which is between one-half and one shaft diameter.
- High pressure discharge lamp according to Claim 1, characterized in that the filament part (18, 18′; 38) has two to four windings.
- High pressure discharge lamp according to Claim 1, characterized in that all the electrode parts consist of pure tungsten.
- High pressure discharge lamp according to Claim 1, characterized in that the electrode shaft consists of a metal which melts at lower temperatures than tungsten, and the filament part and the top part consist of pure or doped tungsten.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4203976 | 1992-02-11 | ||
| DE4203976A DE4203976A1 (en) | 1992-02-11 | 1992-02-11 | HIGH PRESSURE DISCHARGE LAMP |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0555755A1 EP0555755A1 (en) | 1993-08-18 |
| EP0555755B1 true EP0555755B1 (en) | 1995-10-11 |
Family
ID=6451416
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP93101665A Expired - Lifetime EP0555755B1 (en) | 1992-02-11 | 1993-02-03 | High pressure discharge lamp |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5510675A (en) |
| EP (1) | EP0555755B1 (en) |
| JP (1) | JPH0613027A (en) |
| CA (1) | CA2089251C (en) |
| DE (2) | DE4203976A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000509892A (en) * | 1997-02-24 | 2000-08-02 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | High pressure metal halide lamp |
| WO2000000996A1 (en) * | 1998-06-30 | 2000-01-06 | Koninklijke Philips Electronics N.V. | High-pressure gas discharge lamp |
| JP2002352772A (en) * | 2001-05-24 | 2002-12-06 | Phoenix Denki Kk | High-pressure discharge lamp |
| JP3926211B2 (en) * | 2002-05-29 | 2007-06-06 | 日本碍子株式会社 | High pressure mercury lamp and sealing material for high pressure mercury lamp |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2687489A (en) * | 1952-06-26 | 1954-08-24 | Hanovia Chemical & Mfg Co | Electrode |
| NL269416A (en) * | 1960-09-21 | |||
| US3170081A (en) * | 1962-06-05 | 1965-02-16 | Westinghouse Electric Corp | Discharge lamp electrode |
| US3778664A (en) * | 1972-12-22 | 1973-12-11 | Westinghouse Electric Corp | Beaded coils for electric lamps and similar devices |
| DE2718527A1 (en) * | 1977-04-26 | 1978-11-09 | Patra Patent Treuhand | High pressure discharge lamp with ferrous spectral output - has ferrous halide and mercury containing filling and closely spaced electrodes |
| US4340836A (en) * | 1978-09-11 | 1982-07-20 | General Electric Company | Electrode for miniature high pressure metal halide lamp |
| US4275329A (en) * | 1978-12-29 | 1981-06-23 | General Electric Company | Electrode with overwind for miniature metal vapor lamp |
| US4766348A (en) * | 1983-06-09 | 1988-08-23 | Gte Products Corporation | Single-ended metal halogen lamp and fabrication process employing ionization potential selection of additive gases |
| US4528478A (en) * | 1983-06-09 | 1985-07-09 | Gte Products Corporation | Single-ended metal halide discharge lamp with minimal color separation |
| DE3641045A1 (en) * | 1986-12-01 | 1988-06-09 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | HIGH PRESSURE DISCHARGE LAMP, SEMI-SIDED |
| DE69011145T2 (en) * | 1989-01-31 | 1995-01-19 | Toshiba Lighting & Technology | Metal vapor discharge lamp pinched on one side. |
-
1992
- 1992-02-11 DE DE4203976A patent/DE4203976A1/en not_active Withdrawn
-
1993
- 1993-01-21 US US08/006,728 patent/US5510675A/en not_active Expired - Lifetime
- 1993-02-03 EP EP93101665A patent/EP0555755B1/en not_active Expired - Lifetime
- 1993-02-03 DE DE59300723T patent/DE59300723D1/en not_active Expired - Fee Related
- 1993-02-10 CA CA002089251A patent/CA2089251C/en not_active Expired - Fee Related
- 1993-02-10 JP JP5047207A patent/JPH0613027A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE59300723D1 (en) | 1995-11-16 |
| CA2089251A1 (en) | 1993-08-12 |
| CA2089251C (en) | 2002-08-20 |
| US5510675A (en) | 1996-04-23 |
| JPH0613027A (en) | 1994-01-21 |
| DE4203976A1 (en) | 1993-08-12 |
| EP0555755A1 (en) | 1993-08-18 |
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