EP0408981A2 - High-pressure discharge lamp - Google Patents
High-pressure discharge lamp Download PDFInfo
- Publication number
- EP0408981A2 EP0408981A2 EP90112707A EP90112707A EP0408981A2 EP 0408981 A2 EP0408981 A2 EP 0408981A2 EP 90112707 A EP90112707 A EP 90112707A EP 90112707 A EP90112707 A EP 90112707A EP 0408981 A2 EP0408981 A2 EP 0408981A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- discharge lamp
- pressure discharge
- electrode
- shaft
- lamp according
- 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
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000004744 fabric Substances 0.000 claims abstract description 16
- 238000007789 sealing Methods 0.000 claims abstract description 13
- 239000010453 quartz Substances 0.000 claims abstract description 12
- 238000002844 melting Methods 0.000 claims description 9
- 230000008018 melting Effects 0.000 claims description 9
- 239000000835 fiber Substances 0.000 claims description 3
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 3
- 229910052753 mercury Inorganic materials 0.000 claims description 2
- 229910001507 metal halide Inorganic materials 0.000 claims description 2
- 150000005309 metal halides Chemical class 0.000 claims description 2
- 229910052756 noble gas Inorganic materials 0.000 claims description 2
- 229910010272 inorganic material Inorganic materials 0.000 claims 1
- 239000011147 inorganic material Substances 0.000 claims 1
- 150000002835 noble gases Chemical class 0.000 claims 1
- 239000011888 foil Substances 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract 1
- 210000003739 neck Anatomy 0.000 description 10
- 235000012239 silicon dioxide Nutrition 0.000 description 10
- 239000002585 base Substances 0.000 description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 4
- 229910052721 tungsten Inorganic materials 0.000 description 4
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 3
- 229910052750 molybdenum Inorganic materials 0.000 description 3
- 239000011733 molybdenum Substances 0.000 description 3
- 239000010937 tungsten Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 2
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011195 cermet Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 239000012255 powdered metal Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 229910052905 tridymite Inorganic materials 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
- H01J61/84—Lamps with discharge constricted by high pressure
- H01J61/86—Lamps with discharge constricted by high pressure with discharge additionally constricted by close spacing of electrodes, e.g. for optical projection
-
- 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
-
- 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
- H01J61/366—Seals for leading-in conductors
Definitions
- the invention relates to a high-pressure discharge lamp, in particular an ultra-high-pressure discharge lamp according to the preamble of claim 1.
- High-pressure discharge lamps with a noble gas filling and possibly mercury and metal halide filling, and in particular ultra-high pressure discharge lamps usually have long bulb necks into which the shafts of the electrodes are melted.
- the long piston necks make it possible to place the sealing foils for the electrode shafts as far as possible from the discharge arc in order to avoid sealing problems on the sealing foils due to the heat of the discharge arc.
- the quartz glass of the bulb neck In the area between the sealing film and the melting end in the direction of the discharge arc, the quartz glass of the bulb neck must not touch the electrode shaft during the mechanical melting process and remain there.
- the different expansion coefficients of the adhering quartz glass and the tungsten shaft can cause cracks or cracks, which lead to lamp failure in the course of the burning time if the expanding electrode bursts the quartz glass in the shaft area. To avoid this, the The electrodes of these lamps are melted by hand.
- the present invention has for its object to provide a high-pressure discharge lamp, in which the formation of cracks in the area of the bulb necks is avoided by the resulting quartz glass.
- the quartz glass can now only touch the tube made of fine quartz fibers according to the invention. Due to the elasticity and the low thermal conductivity of the tube - due to the fabric structure - there is no longer any harmful adhesive effect between the quartz and the fabric tube.
- the fabric tube also allows the use of centering rollers in the manufacture of the lamp, around the electrodes axially to the axis of rotation of the melt align the machine. This mechanical alignment has not been possible until now because the quartz glass easily stuck to the electrode shaft. So far, the alignment has been carried out by hand so that the quartz that may occur on the electrode shaft during the alignment can be removed again immediately.
- the quartz tube should extend with one end to the sealing film and the other end should coincide with the end of the melting in the direction of the discharge space.
- Optimal conditions result if the fabric hose extends at least 0.5 mm in front of the melting end and does not protrude more than 0.5 mm beyond the melting end.
- the fabric tube should have an inner diameter that corresponds at least to the outer diameter of the electrode shaft and is at most 0.5 mm larger than this.
- the fabric tube preferably has a wall thickness which is between 0.3 and 2 mm.
- the invention is illustrated by the following figure.
- the figure shows a high-pressure mercury vapor discharge lamp according to the invention with a power consumption of 200 W, in which the part of the lamp essential for the invention is cut open. It can be operated with both alternating and direct current.
- the discharge bulb 1 made of quartz glass has an essentially ellipsoidal shape.
- an electrode shaft 4, 5 made of tungsten is melted in a gas-tight manner via a molybdenum sealing film 6, 7.
- the molybdenum sealing film 6, 7, on the other hand, is electrically connected to a base 8, 9 of the SFc 10-4 type, the base sleeve 10, 11 of which is attached to the free end of each piston neck 2, 3.
- a threaded pin 12, 13 is welded onto the base sleeve 10, 11, on which in turn a knurled nut 14, 15 is screwed.
- the electrical connection to the mains or ballast is established by connecting cables which are clamped between the base sleeve 10, 11 and the knurled nut 14, 15.
- Tungsten coils 17, 18 are wound as tips on the two electrode shafts 4, 5 projecting into the discharge space 16.
- the shaft 4 of the cathode additionally carries a further coil 19 made of a thinner tungsten wire behind the coil tip 17 and wound on the shaft.
- Both the electrode shaft 4 and the molybdenum layering film 6 of the cathode are longer than the shaft 5 or the film 7 of the anode. This also means that the piston neck 2 for the cathode is longer than the piston neck 3 for the anode.
- the area of the discharge bulb 1 behind the anode helix tip 18 is provided with a reflective coating 20.
- the two electrode shafts 4, 5 are surrounded by a flexible hose 21, 22 made of braided quartz fibers.
- the quartz tubes 21, 22 extend with one end to the sealing film.
- the the other end of the tube 21, 22 extends up to 0.5 mm in front of the melting end in the direction of the discharge space 16.
- the two tubes 21, 22 have an inner diameter of 1.6 mm and are therefore the same size as the outer diameter of the respective electrode shaft 4, 5
- the wall thickness of the hoses is 0.7 mm.
- the fabric of the quartz tube consists of over 98% SiO2, the rest are trace elements from alkali and alkaline earth oxides.
Landscapes
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
Description
Die Erfindung betrifft eine Hochdruckentladungslampe, insbesondere Höchstdruckentladungslampe gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a high-pressure discharge lamp, in particular an ultra-high-pressure discharge lamp according to the preamble of claim 1.
Hochdruckentladungslampen mit einer Edelgas- sowie evtl. Quecksilber- und Metallhalogenidfüllung und insbesondere Höchstdruckentladungslampen besitzen meist lange Kolbenhälse, in die die Schäfte der Elektroden eingeschmolzen sind. Die langen Kolbenhälse ermöglichen es, die Dichtungsfolien für die Elektrodenschäfte möglichst weit entfernt vom Entladungsbogen zu plazieren, um Abdichtungsprobleme an den Dichtungsfolien durch die Wärme des Entladungsbogen zu vermeiden. Im Bereich zwischen Dichtungsfolie und Einschmelzende in Richtung Entladungsbogen darf das Quarzglas des Kolbenhalses den Elektrodenschaft beim maschinellen Einschmelzvorgang nicht berühren und dort haften bleiben. Wird dies nicht beachtet, können durch die unterschiedlichen Ausdehnungskoeffizienten des anhaftenden Quarzglases und des Wolframschaftes Sprünge oder Risse entstehen, die im Laufe der Brenndauer zu einem Ausfall der Lampen führen, wenn die ausdehnende Elektrode das Quarzglas im Schaftbereich sprengt. Um dies zu vermeiden, wird daher die Einschmelzung der Elektroden bei diesen Lampen von Hand vorgenommen.High-pressure discharge lamps with a noble gas filling and possibly mercury and metal halide filling, and in particular ultra-high pressure discharge lamps, usually have long bulb necks into which the shafts of the electrodes are melted. The long piston necks make it possible to place the sealing foils for the electrode shafts as far as possible from the discharge arc in order to avoid sealing problems on the sealing foils due to the heat of the discharge arc. In the area between the sealing film and the melting end in the direction of the discharge arc, the quartz glass of the bulb neck must not touch the electrode shaft during the mechanical melting process and remain there. If this is not taken into account, the different expansion coefficients of the adhering quartz glass and the tungsten shaft can cause cracks or cracks, which lead to lamp failure in the course of the burning time if the expanding electrode bursts the quartz glass in the shaft area. To avoid this, the The electrodes of these lamps are melted by hand.
Aus der US-PS 3 742 283 ist bekannt, die Elektrodenschäfte im Bereich der Quetschung mit konzentrischen Röhren aus Cermet, einer Schmelzverbindung aus pulverförmigem Metall und Quarzglas, zu umgeben, um Spannungen im Bereich der Quetschungen klein zu halten. Die Röhren besitzen einen Ausdehnungskoeffizienten, der zwischen dem des Quarzes und dem des metallischen Elektrodenschaftes liegt.From US Pat. No. 3,742,283 it is known to surround the electrode shafts in the area of the squeeze with concentric tubes made of cermet, a fusion connection made of powdered metal and quartz glass, in order to keep stresses in the area of the squeezes small. The tubes have a coefficient of expansion that lies between that of the quartz and that of the metallic electrode shaft.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Hochdruckentladungslampe zu schaffen, bei der eine Bildung von Rissen im Bereich der Kolbenhälse durch anfallendes Quarzglas vermieden wird.The present invention has for its object to provide a high-pressure discharge lamp, in which the formation of cracks in the area of the bulb necks is avoided by the resulting quartz glass.
Die Aufgabe wird durch das kennzeichnende Merkmal des Anspruchs 1 gelöst. Weitere vorteilhafte Merkmale sind den Unteransprüchen zu entnehmen.The object is achieved by the characterizing feature of claim 1. Further advantageous features can be found in the subclaims.
Im Bereich der Kolbenhälse zwischen Dichtungsfolie und Einschmelzende kann das Quarzglas jetzt lediglich den erfindungsgemäßen Schlauch aus feinen Quarzfasern berühren. Aufgrund der Elastizität und der geringen Wärmeleitfähigkeit des Schlauches - bedingt durch die Gewebestruktur - kommt es zu keinem schädlichen Klebeeffekt zwischen Quarz und Gewebeschlauch mehr.In the area of the piston necks between the sealing film and the melting end, the quartz glass can now only touch the tube made of fine quartz fibers according to the invention. Due to the elasticity and the low thermal conductivity of the tube - due to the fabric structure - there is no longer any harmful adhesive effect between the quartz and the fabric tube.
Der Gewebeschlauch erlaubt außerdem den Einsatz von Zentrierrollen bei der Herstellung der Lampe, um die Elektroden axial zur Drehachse der Einschmelz maschine auszurichten. Diese maschinelle Ausrichtung war bisher nicht möglich, da hierbei leicht das Quarzglas am Elektrodenschaft haften blieb. Die Ausrichtung erfolgte daher bisher von Hand, um das bei der Ausrichtung evtl. an den Elektrodenschaft anfallende Quarz sofort wieder entfernen zu können.The fabric tube also allows the use of centering rollers in the manufacture of the lamp, around the electrodes axially to the axis of rotation of the melt align the machine. This mechanical alignment has not been possible until now because the quartz glass easily stuck to the electrode shaft. So far, the alignment has been carried out by hand so that the quartz that may occur on the electrode shaft during the alignment can be removed again immediately.
Untersuchungen mit Quarzschläuchen verschiedener Dicken und Längen haben ergeben, daß für einen guten Klebeschutz der Quarzschlauch mit seinem einen Ende bis an die Dichtungsfolie reichen und sein anderes Ende mit dem Ende der Einschmelzung in Richtung Entladungsraum zusammenfallen sollte. Optimale Bedingungen ergeben sich, wenn der Gewebeschlauch bis mindestens 0,5 mm vor das Einschmelzende reicht und nicht mehr als 0,5 mm über das Einschmelzende hinausragt. Der Gewebeschlauch sollte dabei einen Innendurchmesser besitzen, der mindestens dem Außendurchmesser des Elektrodenschaftes entspricht und höchstens 0,5 mm größer als dieser ist. Vorzugsweise besitzt der Gewebeschlauch eine Wandstärke, die zwischen 0,3 und 2 mm liegt.Investigations with quartz tubes of different thicknesses and lengths have shown that for good adhesive protection the quartz tube should extend with one end to the sealing film and the other end should coincide with the end of the melting in the direction of the discharge space. Optimal conditions result if the fabric hose extends at least 0.5 mm in front of the melting end and does not protrude more than 0.5 mm beyond the melting end. The fabric tube should have an inner diameter that corresponds at least to the outer diameter of the electrode shaft and is at most 0.5 mm larger than this. The fabric tube preferably has a wall thickness which is between 0.3 and 2 mm.
Die Erfindung ist anhand der nachfolgenden Figur näher veranschaulicht.The invention is illustrated by the following figure.
Die Figur zeigt eine erfindungsgemäße Quecksilberdampf-Höchstdruckentladungslampe mit 200 W Leistungsaufnahme, bei der der für die Erfindung wesentliche Teil der Lampe aufgeschnitten ist. Sie kann sowohl mit Wechsel- als auch mit Gleichstrom betrieben werden. Der Entladungskolben 1 aus Quarzglas besitzt eine im wesentlichen ellipsoidförmige Gestalt. An den den Brennpunkten benachbarten Rundungen des Kolbens 1 ist je ein zylindrischer Kolbenhals 2, 3, ebenfalls aus Quarzglas, angesetzt. In diese beiden Kolbenhälse 2, 3 ist je ein Elektrodenschaft 4, 5 aus Wolfram über eine Molybdändichtungsfolie 6, 7 gasdicht eingeschmolzen. Die Molybdändichtungsfolie 6, 7 ist andererseits mit einem Sockel 8, 9 vom Typ SFc 10-4 elektrisch verbunden, dessen Sockelhülse 10, 11 auf das freie Ende jedes Kolbenhalses 2, 3 aufgesteckt ist. Auf die Sockelhülse 10, 11 ist ein Gewindestift 12, 13 geschweißt, auf den wiederum eine Rändelmutter 14, 15 geschraubt ist. Die elektrische Verbindung mit dem Netz bzw. Vorschaltgerät wird durch Verbindungskabel hergestellt, die zwischen Sockelhülse 10, 11 und Rändelmutter 14, 15 eingeklemmt werden.The figure shows a high-pressure mercury vapor discharge lamp according to the invention with a power consumption of 200 W, in which the part of the lamp essential for the invention is cut open. It can be operated with both alternating and direct current. The discharge bulb 1 made of quartz glass has an essentially ellipsoidal shape. At the curves of the piston 1 adjacent to the focal points there is a cylindrical one Piston
Auf die beiden in den Entladungsraum 16 ragenden Elektrodenschäfte 4, 5 sind als Spitzen Wolframwendeln 17, 18 aufgewickelt. Für den Gleichstrombetrieb trägt der Schaft 4 der Kathode zusätzlich hinter der Wendelspitze 17 eine weitere auf den Schaft gewickelte Wendel 19 aus einem dünneren Wolframdraht. Sowohl der Elektrodenschaft 4 als auch die Molybdänschichtungsfolie 6 der Kathode sind länger als der Schaft 5 bzw. die Folie 7 der Anode. Dadurch ergibt sich auch, daß der Kolbenhals 2 für die Kathode länger als Kolbenhals 3 für die Anode ist. Der Bereich des Entladungskolbens 1 hinter der Anodenwendelspitze 18 ist mit einer reflektierenden Beschichtung 20 versehen.
Die beiden Elektrodenschäfte 4, 5 sind von einem flexiblen Schlauch 21, 22 aus geflochtenen Quarzfasern umgeben. Die Quarzschläuche 21 , 22 reichen mit ihrem einen Ende bis an die Dichtungsfolie. Das andere Ende des Schlauches 21, 22 reicht bis jeweils 0,5 mm vor das Einschmelzende in Richtung Entladungsraum 16. Die beiden Schläuche 21, 22 besitzen einen Innendurchmesser von 1,6 mm und sind damit genauso groß wie der Außendurchmesser des jeweiligen Elektrodenschaftes 4, 5. Die Wandstärke der Schläuche beträgt 0,7 mm. Das Gewebe des Quarzschlauches besteht aus über 98 % SiO₂, der Rest sind Spurenelemente aus Alkali- und Erdalkalioxiden.The two
Claims (7)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3923589 | 1989-07-17 | ||
| DE3923589A DE3923589A1 (en) | 1989-07-17 | 1989-07-17 | HIGH PRESSURE DISCHARGE LAMP |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0408981A2 true EP0408981A2 (en) | 1991-01-23 |
| EP0408981A3 EP0408981A3 (en) | 1991-04-24 |
| EP0408981B1 EP0408981B1 (en) | 1994-09-21 |
Family
ID=6385205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90112707A Expired - Lifetime EP0408981B1 (en) | 1989-07-17 | 1990-07-03 | High-pressure discharge lamp |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US5107177A (en) |
| EP (1) | EP0408981B1 (en) |
| JP (1) | JPH0357154A (en) |
| KR (1) | KR910003747A (en) |
| DD (1) | DD296783A5 (en) |
| DE (2) | DE3923589A1 (en) |
| HU (1) | HU203611B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0818804A2 (en) * | 1996-07-10 | 1998-01-14 | Koito Manufacturing Co., Ltd | ARC tube for discharge lamp device |
| EP0858098A2 (en) * | 1997-02-07 | 1998-08-12 | Stanley Electric Co., Ltd. | Metal halide headlamp |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5598063A (en) * | 1992-12-16 | 1997-01-28 | General Electric Company | Means for supporting and sealing the lead structure of a lamp |
| US5594302A (en) * | 1995-08-22 | 1997-01-14 | Lamptech Ltd. | Metal halide lamp including iron and molybdenum |
| DE19712776A1 (en) * | 1996-08-21 | 1998-10-01 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | High pressure discharge lamp |
| CN1293598C (en) * | 1998-12-21 | 2007-01-03 | 皇家菲利浦电子有限公司 | Electric lamp |
| JP3665510B2 (en) * | 1999-06-28 | 2005-06-29 | 株式会社小糸製作所 | Arc tube for discharge lamp equipment |
| EP1065698B1 (en) * | 1999-07-02 | 2008-07-30 | Phoenix Electric Co., Ltd. | Mount for lamp and lamp seal structure employing the mount |
| EP1296356B1 (en) * | 2001-09-13 | 2014-03-05 | Ushiodenki Kabushiki Kaisha | Super-high pressure discharge lamp of the short arc type |
| KR20030046318A (en) * | 2001-12-05 | 2003-06-12 | 마쯔시다덴기산교 가부시키가이샤 | Method for producing the high pressure discharge lamp, high pressure discharge lamp and lamp unit |
| DE10214777A1 (en) * | 2002-04-03 | 2003-10-16 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Metal halide lamp with ceramic discharge tube |
| DE102009011525A1 (en) | 2009-03-03 | 2010-09-09 | Osram Gesellschaft mit beschränkter Haftung | Electric lamp and method of manufacture |
| KR102071767B1 (en) | 2017-01-26 | 2020-03-03 | 산하토건(주) | Mixing treatment apparatus installed amixing treatment Equipment using a mixing axis which is suppling agent for soft ground improve ment by a 1.5 Shot method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3259778A (en) * | 1963-05-09 | 1966-07-05 | Gen Electric | Starting of high temperature electrode lamps |
| JPS5519733A (en) * | 1978-07-28 | 1980-02-12 | Mitsubishi Electric Corp | High voltage mercury gas discharge lamp |
| US4559472A (en) * | 1982-02-16 | 1985-12-17 | Patent Treuhand Gesellschaft Fur Elektrische Gluhlampen Mbh | High-pressure discharge lamp having support structures for the elongate electrodes thereof |
| JPH01151149A (en) * | 1987-12-07 | 1989-06-13 | Toshiba Corp | High-pressure discharge lamp |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2443632A (en) * | 1946-04-16 | 1948-06-22 | Samuel C Miller | Braid shielding |
| US3742283A (en) * | 1971-10-28 | 1973-06-26 | Gte Sylvania Inc | Press seal for lamp having fused silica envelope |
| US3868528A (en) * | 1974-01-14 | 1975-02-25 | Gen Electric | Quartz pinches containing sealant glass |
| GB8303074D0 (en) * | 1983-02-04 | 1983-03-09 | Gen Electric Co Plc | Electric discharge lamps |
-
1989
- 1989-07-17 DE DE3923589A patent/DE3923589A1/en not_active Withdrawn
-
1990
- 1990-07-03 DE DE59007201T patent/DE59007201D1/en not_active Expired - Fee Related
- 1990-07-03 EP EP90112707A patent/EP0408981B1/en not_active Expired - Lifetime
- 1990-07-09 US US07/550,139 patent/US5107177A/en not_active Expired - Fee Related
- 1990-07-13 DD DD90342787A patent/DD296783A5/en not_active IP Right Cessation
- 1990-07-16 HU HU904227A patent/HU203611B/en not_active IP Right Cessation
- 1990-07-16 KR KR1019900010769A patent/KR910003747A/en not_active Application Discontinuation
- 1990-07-17 JP JP2187334A patent/JPH0357154A/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3259778A (en) * | 1963-05-09 | 1966-07-05 | Gen Electric | Starting of high temperature electrode lamps |
| JPS5519733A (en) * | 1978-07-28 | 1980-02-12 | Mitsubishi Electric Corp | High voltage mercury gas discharge lamp |
| US4559472A (en) * | 1982-02-16 | 1985-12-17 | Patent Treuhand Gesellschaft Fur Elektrische Gluhlampen Mbh | High-pressure discharge lamp having support structures for the elongate electrodes thereof |
| JPH01151149A (en) * | 1987-12-07 | 1989-06-13 | Toshiba Corp | High-pressure discharge lamp |
Non-Patent Citations (3)
| Title |
|---|
| 151149 (TOSHIBA) 13 Juni 89, * |
| PATENT ABSTRACTS OF JAPAN vol. 13, no. 410 (E-819)(3758) 11 September 89, & JP-A-1 151149 (TOSHIBA) 13 Juni 89, * |
| PATENT ABSTRACTS OF JAPAN vol. 4, no. 48 (E-6)(530& JP-A-55 19733 (MITSUBISHI) 12 Februar 80, * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0818804A2 (en) * | 1996-07-10 | 1998-01-14 | Koito Manufacturing Co., Ltd | ARC tube for discharge lamp device |
| EP0818804A3 (en) * | 1996-07-10 | 1998-03-18 | Koito Manufacturing Co., Ltd | ARC tube for discharge lamp device |
| US5877591A (en) * | 1996-07-10 | 1999-03-02 | Koito Manufacturing Co., Ltd. | Arc tube for discharge lamp device |
| EP0858098A2 (en) * | 1997-02-07 | 1998-08-12 | Stanley Electric Co., Ltd. | Metal halide headlamp |
| EP0858098A3 (en) * | 1997-02-07 | 1998-10-07 | Stanley Electric Co., Ltd. | Metal halide headlamp |
| US5936350A (en) * | 1997-02-07 | 1999-08-10 | Stanley Electric Co., Ltd. | Metal halide headlamp |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0357154A (en) | 1991-03-12 |
| US5107177A (en) | 1992-04-21 |
| JPH0586028B2 (en) | 1993-12-09 |
| DD296783A5 (en) | 1991-12-12 |
| EP0408981A3 (en) | 1991-04-24 |
| DE59007201D1 (en) | 1994-10-27 |
| HUT54827A (en) | 1991-03-28 |
| HU904227D0 (en) | 1990-12-28 |
| DE3923589A1 (en) | 1991-01-24 |
| EP0408981B1 (en) | 1994-09-21 |
| HU203611B (en) | 1991-08-28 |
| KR910003747A (en) | 1991-02-28 |
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