EP0154383A2 - Heatable electrode for high-pressure gas discharge lamps - Google Patents
Heatable electrode for high-pressure gas discharge lamps Download PDFInfo
- Publication number
- EP0154383A2 EP0154383A2 EP85200312A EP85200312A EP0154383A2 EP 0154383 A2 EP0154383 A2 EP 0154383A2 EP 85200312 A EP85200312 A EP 85200312A EP 85200312 A EP85200312 A EP 85200312A EP 0154383 A2 EP0154383 A2 EP 0154383A2
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- European Patent Office
- Prior art keywords
- helix
- metal wire
- wire
- coil
- electrode
- 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.)
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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
- H01J61/073—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 heatable electrode for igniting and reigniting high-pressure gas discharge lamps, consisting of a self-supporting cylindrical open filament made of tungsten or molybdenum wire with a metal wire made of tungsten or molybdenum coaxially guided through the filament and connected to it.
- Such electrodes serve to reduce the ignition voltage of gas discharge lamps.
- the heating of the electrode can either be maintained during the entire lamp operation or can be switched off after the lamp has been ignited.
- the filament In the case of an electrode of this type known from DE-OS 31 06 201 for the hot re-ignition of high-pressure 400W mercury vapor lamps, the filament consists of relatively thick wire and the individual turns of the filament are drawn apart so that they do not touch one another. At the outermost turn, the helix wire merges with the metal wire guided coaxially through the helix without changing the cross section. For preheating, the entire electrode is heated evenly, which requires relatively high currents in the thick filament wire, but which may only flow through the melts of the lamp ends in the case of high-power lamps.
- a high-pressure gas discharge lamp is known with an electrode which is wound cylindrically on a tungsten rod and to the outer end of which a heating coil consisting of thin wire is connected. If an ignition pulse is applied to the lamp after the electrode has been preheated, the discharge arc will first set on the lamp Heating coil and then migrates to the actual cylindrical wound electrode. This requires the geometry of the electrode arrangement to be observed exactly. There is also the risk that the discharge arc remains on the thin heating coil for too long and thus leads to its destruction.
- the known heatable electrodes are also due to their relatively large dimensions for so-called miniaturized gas discharge lamps, i.e. Gas discharge lamps with a power up to about 70 W, not suitable.
- the invention is therefore based on the object of providing a heatable electrode for high-pressure gas discharge lamps which is of compact design, requires little heating power and cannot be damaged by the discharge arc attacking during ignition.
- the metal wire passed through the filament has a smaller diameter than the filament, ie has a higher specific electrical resistance than the filament, it is strongly heated when this electrode is preheated and set in a red-hot state.
- This effect is further supported in that the turns of the helix lie against each other, so that the electrical resistance of the helix to that of the the helical metal wire can be neglected.
- the heating of the metal wire in the helix leads to heating of the outermost turn of the helix due to heat conduction, so that this too becomes red-hot. For this reason, during the subsequent ignition, the discharge arc starts on the filament and not on the thin metal wire, since it ends before the outermost turn of the filament.
- Such a heatable electrode is well suited for miniaturized gas discharge lamps, in particular metal halide discharge lamps.
- the metal wire is independent of the helix wire and, with its helix end, is clamped between two turns of the helix.
- the metal wire is expediently clamped in the area of the outer turns of the helix, in particular between its second and third turns.
- the metal wire can also be attached to the coil by spot welding.
- the metal wire is designed as an extension of the helix wire and is etched to a smaller diameter up to the outermost turn of the helix. This has the advantage that the helix and the metal wire consist of one piece.
- the individual windings 3 of the coil 1 lie close together.
- Coaxial through the coil 1 is a metal wire 4 made of e.g. Tungsten guided, which has a smaller diameter than the helical wire 2.
- This metal wire 4, which is guided coaxially through the helix 1, is bent at its front end 5 and possibly flattened and clamped between two turns 3 of the helix 1, in particular between its second and third turns. The outermost turn is labeled 6.
- the electrode shown in FIGS. 3 and 4 is constructed similarly to the electrode according to FIGS. 1 and 2. In this case, however, the helix wire end 7 of the outermost turn 6 is bent back and passed coaxially through the helix 1 as an extension of the helix wire 2.
- the thin metal wire 4 or 8 When the electrodes described are heated, the thin metal wire 4 or 8 first heats up. Due to heat conduction, the outermost turn 6 of the filament 1 then heats up. When a high-pressure gas discharge lamp provided with such electrodes is ignited the discharge arc therefore starts immediately on the filament 1. Destruction of the metal wire 4 or 8 is therefore excluded.
- the filament consisted of five turns of tungsten wire with a wire diameter of 180 ⁇ m and an inner diameter of 500 ⁇ m.
- a tungsten wire with a diameter of 50 to 100 ⁇ m was clamped between the second and third turns of the coil.
- Such electrodes were installed in the bulbs of miniaturized high-pressure gas discharge lamps, which have a volume of approximately 0.25 cm 3 and an electrode spacing of approximately 0.5 cm.
- the flasks were filled with 1 mg Hg and an inert gas pressure of 200 torr, as well as different metal halide compositions. If the electrodes are heated to approx. 3000 K, these lamps ignite without an ignition pulse at a supply voltage of 220 V. Some lamps without preheating, however, could not be ignited even with ignition pulses of 4.5 kV.
- lamps can also be used when hot, i.e. So immediately after switching off from the steady state, be ignited again with approx. 220 V without ignition pulse.
- lamps that e.g. Containing iodine (NaJ, HgJ2 etc.) this immediate reignition could not be achieved when hot, but here too the time between switching off and reigniting was reduced considerably.
- heated electrodes it was possible to re-ignite after approx. 20 sec at a supply voltage of 220 V without an additional ignition pulse.
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- Discharge Lamp (AREA)
- Resistance Heating (AREA)
Abstract
Bei einer heizbaren Elektrode zum Zünden und Wiederzünden von Hochdruck-Gasentladungslampen, bestehend aus einer selbsttragenden zylindrischen offenen Wendel (1) aus Wolfram- oder Molybdändraht mit einem koaxial durch die Wendel geführten und mit dieser verbundenen Metalldraht (4 bzw. 8) aus Wolfram oder Molybdän, liegen die Windungen (3) der Wendel (1) aneinander, besitzt der koaxial durch die Wendel geführte Metalldraht (4 bzw. 8) einen kleineren Durchmesser als der Wendeldraht (2) und endet dieser dünne Metalldraht vor der äußersten Windung (6) der Wendel.In the case of a heatable electrode for igniting and re-igniting high-pressure gas discharge lamps, consisting of a self-supporting cylindrical open filament (1) made of tungsten or molybdenum wire with a metal wire (4 or 8) made of tungsten or molybdenum coaxially guided through and connected to the filament , If the turns (3) of the helix (1) are next to each other, the coaxial metal wire (4 or 8) guided through the helix has a smaller diameter than the helix wire (2) and this thin metal wire ends in front of the outermost turn (6) of the Spiral.
Description
Die Erfindung bezieht sich auf eine heizbare Elektrode zum Zünden und Wiederzünden von Hochdruck-Gasentladungslampen, bestehend aus einer selbsttragenden zylindrischen offenen Wendel aus Wolfram- oder Molybdändraht mit einem koaxial durch die Wendel geführten und mit dieser verbundenen Metalldraht aus Wolfram oder Molybdän. Derartige Elektroden dienen zur Herabsetzung der Zündspannung von Gasentladungslampen. Die Heizung der Elektrode kann entweder während des gesamten Lampenbetriebes aufrechterhalten oder nach Zündung der Lampe abgeschaltet werden.The invention relates to a heatable electrode for igniting and reigniting high-pressure gas discharge lamps, consisting of a self-supporting cylindrical open filament made of tungsten or molybdenum wire with a metal wire made of tungsten or molybdenum coaxially guided through the filament and connected to it. Such electrodes serve to reduce the ignition voltage of gas discharge lamps. The heating of the electrode can either be maintained during the entire lamp operation or can be switched off after the lamp has been ignited.
Bei einer aus der DE-OS 31 06 201 bekannten Elektrode dieser Art zur heißen Wiederzündung von 400W-Quecksilberdampf-Hochdrucklampen besteht die Wendel aus relativ dickem Draht und sind deren einzelnen Windungen weit auseinander gezogen, so daß sie sich nicht gegenseitig berühren. An der äußersten Windung geht der Wendeldraht ohne Querschnittsveränderung in den koaxial durch die Wendel geführten Metalldraht über. Zum Vorheizen wird die gesamte Elektrode gleichmäßig erhitzt, was bei dem dicken Wendeldraht relativ hohe Ströme erfordert, die aber nur bei Hochleistungslampen durch die Einschmelzungen der Lampenenden fließen dürfen.In the case of an electrode of this type known from DE-OS 31 06 201 for the hot re-ignition of high-pressure 400W mercury vapor lamps, the filament consists of relatively thick wire and the individual turns of the filament are drawn apart so that they do not touch one another. At the outermost turn, the helix wire merges with the metal wire guided coaxially through the helix without changing the cross section. For preheating, the entire electrode is heated evenly, which requires relatively high currents in the thick filament wire, but which may only flow through the melts of the lamp ends in the case of high-power lamps.
Aus der US-PS 3 519 872 ist eine Hochdruck-Gasentladungslampe bekannt mit einer auf einem Wolframstab zylindrisch gewickelten Elektrode, an deren äußeres Ende eine aus dünnem Draht bestehende Heizwendel angeschlossen ist. Legt man nach dem Vorheizen dieser- Elektrode einen Zündimpuls an die Lampe, so setzt der Entladungsbogen zunächst an der Heizwendel an und wandert dann auf die eigentliche zylindrisch gewickelte Elektrode. Dies erfordert eine genau einzuhaltende Geometrie der Elektrodenanordnung. Außerdem besteht die Gefahr, daß der Entladungsbogen zu lange auf der dünnen Heizwendel stehen bleibt und somit zu dessen Zerstörung führt.From US Pat. No. 3,519,872, a high-pressure gas discharge lamp is known with an electrode which is wound cylindrically on a tungsten rod and to the outer end of which a heating coil consisting of thin wire is connected. If an ignition pulse is applied to the lamp after the electrode has been preheated, the discharge arc will first set on the lamp Heating coil and then migrates to the actual cylindrical wound electrode. This requires the geometry of the electrode arrangement to be observed exactly. There is also the risk that the discharge arc remains on the thin heating coil for too long and thus leads to its destruction.
Die bekannten heizbaren Elektroden sind darüber hinaus aufgrund ihrer relativ großen Abmessungen für sog. miniaturisierte Gasentladungslampen, d.h. Gasentladungslampen mit einer Leistung bis zu etwa 70 W, nicht geeignet.The known heatable electrodes are also due to their relatively large dimensions for so-called miniaturized gas discharge lamps, i.e. Gas discharge lamps with a power up to about 70 W, not suitable.
Der Erfindung liegt daher die Aufgabe zugrunde, eine heizbare Elektrode für Hochdruck-Gasentladungslampen zu schaffen, die kompakt ausgebildet ist, wenig Heizleistung benötigt und durch den beim Zünden angreifenden Entladungsbogen nicht beschädigt werden kann.The invention is therefore based on the object of providing a heatable electrode for high-pressure gas discharge lamps which is of compact design, requires little heating power and cannot be damaged by the discharge arc attacking during ignition.
Diese Aufgabe wird bei einer heizbaren Elektrode eingangs erwähnter Art gemäß der Erfindung dadurch gelöst, daß die Windungen der Wendel aneinander liegen und der koaxial durch die Wendel geführte Metalldraht einen kleineren Durchmesser als der Wendeldraht besitzt und daß dieser dünne Metalldraht vor der äußersten Windung der Wendel endet.This object is achieved in a heatable electrode of the type mentioned at the outset according to the invention in that the turns of the helix lie against one another and the metal wire which is guided coaxially through the helix has a smaller diameter than the helix wire and that this thin metal wire ends before the outermost turn of the helix .
Da hierbei der durch die Wendel geführte Metalldraht einen kleineren Durchmesser als der Wendeldraht besitzt, d.h. einen höheren spezifischen elektrischen Widerstand als die Wendel aufweist, wird er beim Vorheizen dieser Elektrode stark erhitzt und in einen rot glühenden Zustand versetzt. Diese Wirkung wird noch dadurch unterstützt, daß die Windungen der Wendel aneinander liegen, so daß der elektrische Widerstand der Wendel gegenüber dem des durch die Wendel geführten Metalldrahtes vernachlässigt werden kann. Insbesondere bei kleinem Wendeldurchmesser führt die Heizung des in der Wendel befindlichen Metalldrahtes aufgrund von Wärmeleitung zu einer Aufheizung der äußersten Windung der Wendel, so daß auch diese rot glühend wird. Aus diesem Grunde erfolgt bei der anschließenden Zündung der Ansatz des Entladungsbogens auf der Wendel und nicht auf dem dünnen Metalldraht, da dieser vor der äußersten Windung der Wendel endet.Since the metal wire passed through the filament has a smaller diameter than the filament, ie has a higher specific electrical resistance than the filament, it is strongly heated when this electrode is preheated and set in a red-hot state. This effect is further supported in that the turns of the helix lie against each other, so that the electrical resistance of the helix to that of the the helical metal wire can be neglected. Particularly with a small helix diameter, the heating of the metal wire in the helix leads to heating of the outermost turn of the helix due to heat conduction, so that this too becomes red-hot. For this reason, during the subsequent ignition, the discharge arc starts on the filament and not on the thin metal wire, since it ends before the outermost turn of the filament.
Eine derartige heizbare Elektrode ist für miniaturisierte Gasentladungslampen, insbesondere Metallhalogenidentladungslampen, gut geeignet.Such a heatable electrode is well suited for miniaturized gas discharge lamps, in particular metal halide discharge lamps.
Bei einer für die Herstellung günstigen Ausführungsform der Elektrode nach der Erfindung ist der Metalldraht vom Wendeldraht unabhängig und mit seinem wendelseitigem Ende zwischen zwei Windungen der Wendel eingeklemmt. Zweckmäßigerweise ist hierbei der Metalldraht im Bereich der äußeren Windungen der Wendel, insbesondere zwischen deren zweiter und dritter Windung, eingeklemmt. Der Metalldraht kann auch durch Punktschweißen an der Wendel befestigt werden.In an embodiment of the electrode according to the invention which is favorable for the manufacture, the metal wire is independent of the helix wire and, with its helix end, is clamped between two turns of the helix. The metal wire is expediently clamped in the area of the outer turns of the helix, in particular between its second and third turns. The metal wire can also be attached to the coil by spot welding.
Bei einer weiteren vorteilhaften Ausführungsform der Elektrode nach der Erfindung ist der Metalldraht als Verlängerung des Wendeldrahtes ausgebildet und bis vor die äußerste Windung der Wendel auf einen kleineren Durchmesser geätzt. Dies hat den Vorteil, daß die Wendel und der Metalldraht aus einem Stück bestehen.In a further advantageous embodiment of the electrode according to the invention, the metal wire is designed as an extension of the helix wire and is etched to a smaller diameter up to the outermost turn of the helix. This has the advantage that the helix and the metal wire consist of one piece.
Einige Ausführungsbeispiele nach der Erfindung werden nunmehr an Hand der Zeichnung näher erläutert. Es zeigen:
- Fig. 1'die Seitenansicht einer heizbaren Elektrode mit einer selbsttragenden zylindrischen offenen Wendel,
- Fig. 2 eine Draufsicht auf die Elektrode nach Fig. 1,
- Fig. 3 die Seitenansicht einer anderen heizbaren Elektrode mit einer selbsttragenden zylindrischen offenen Wendel,
- Fig. 4 die Draufsicht auf die Elektrode nach Fig. 3.
- 1 'the side view of a heatable electrode with a self-supporting cylindrical open coil,
- 2 is a plan view of the electrode of FIG. 1,
- 3 shows the side view of another heatable electrode with a self-supporting cylindrical open coil,
- 4 shows the top view of the electrode according to FIG. 3.
Die Elektrode nach den Fig. 1 und 2 besteht aus einer selbsttragenden zylindrischen offenen Wendel 1 aus Wolfram- oder Molybdändraht 2. Die einzelnen Windungen 3 der Wendel 1 liegen eng aneinander. Koaxial durch die Wendel 1 ist ein Metalldraht 4 aus z.B. Wolfram geführt, der einen kleineren Durchmesser als der Wendeldraht 2 besitzt. Dieser koaxial durch die Wendel 1 geführte Metalldraht 4 ist an seinen vorderen Ende 5 abgebogen und gegebenenfalls abgeflacht und zwischen zwei Windungen 3 der Wendel 1, insbesondere zwischen deren zweiter und dritter Windung, eingeklemmt. Die äußerste Windung ist mit 6 bezeichnet.1 and 2 consists of a self-supporting cylindrical
Die in den Fig. 3 und 4 dargestellte Elektrode ist ähnlich aufgebaut wie die Elektrode nach den Fig. 1 und 2. In diesem Fall ist jedoch das Wendeldrahtende 7 der äußersten Windung 6 zurückgebogen und als Verlängerung des Wendeldrahtes 2 koaxial durch die Wendel 1 hindurchgeführt. Der sich im Inneren der Wendel 1 befindliche Metalldraht 8, der zunächst denselben Durchmesser wie der Wendeldraht 2 hatte, ist dann bis vor die äußerste Windung 6 der Wendel 1 auf einem kleineren Durchmesser geätzt worden.The electrode shown in FIGS. 3 and 4 is constructed similarly to the electrode according to FIGS. 1 and 2. In this case, however, the helix wire end 7 of the outermost turn 6 is bent back and passed coaxially through the
Beim Heizen der beschriebenen Elektroden erhitzt sich zunächst der dünne Metalldraht 4 bzw. 8. Aufgrund von Wärmeleitung kommt es dann zu einer Aufheizung der äußersten Windung 6 der Wendel 1. Bei Zündung einer mit solchen Elektroden versehenen Hochdruck-Gasentladungslampe setzt der Entladungsbogen daher sofort auf der Wendel 1 an. Eine Zerstörung des Metalldrahtes 4 bzw. 8 ist daher ausgeschlossen.When the electrodes described are heated, the thin metal wire 4 or 8 first heats up. Due to heat conduction, the outermost turn 6 of the
Bei praktischen Versuchen mit derartigen Elektroden für 30 W- bzw. 40 W-Metallhalogenidentladungslampen bestand die Wendel aus fünf Windungen Wolframdraht mit einem Drahtdurchmesser von 180 um und einem Innendurchmesser von 500 um. Bei einer den Fig. 1 und 2 entsprechenden Elektrode wurde zwischen der zweiten und dritten Windung der Wendel ein Wolframdraht von 50 bis 100 um Durchmesser eingeklemmt.In practical tests with such electrodes for 30 W or 40 W metal halide discharge lamps, the filament consisted of five turns of tungsten wire with a wire diameter of 180 μm and an inner diameter of 500 μm. In an electrode corresponding to FIGS. 1 and 2, a tungsten wire with a diameter of 50 to 100 μm was clamped between the second and third turns of the coil.
Derartige Elektroden wurden in Kolben von miniaturisierten Hochdruck-Gasentladungslampen eingebaut, die ein Volumen von ca. 0,25 cm3 und einen Elektrodenabstand von ca. 0,5 cm besitzen. Die Kolben wurden gefüllt mit 1 mg Hg und einem Edelgasdruck von 200 Torr, sowie unterschiedlichen Metallhalogenidzusammensetzungen. Wenn man die Elektroden auf ca. 3000 K aufheizt, zünden diese Lampen ohne Zündimpuls an einer Versorgungsspannung von 220 V. Einige Lampen ohne Vorheizung konnten dagegen auch mit Zündimpulsen von 4,5 kV nicht gezündet werden.Such electrodes were installed in the bulbs of miniaturized high-pressure gas discharge lamps, which have a volume of approximately 0.25 cm 3 and an electrode spacing of approximately 0.5 cm. The flasks were filled with 1 mg Hg and an inert gas pressure of 200 torr, as well as different metal halide compositions. If the electrodes are heated to approx. 3000 K, these lamps ignite without an ignition pulse at a supply voltage of 220 V. Some lamps without preheating, however, could not be ignited even with ignition pulses of 4.5 kV.
Füllt man solche Lampen nur mit Hg und Edelgas, so können diese Lampen auch im heißen Zustand, d.h. also unmittelbar nach dem Abschalten aus den stationären Zustand, mit ca. 220 V ohne Zündimpuls wieder gezündet werden. Bei Lampen, die z.B. Jod (NaJ, HgJ2 usw.) enthalten, konnte diese unmittelbare Wiederzündung im heißen Zustand zwar nicht erreicht werden, jedoch reduzierte sich auch hier die Zeit zwischen Ausschalten und Wiederzünden erheblich. Mit geheizten Elektroden war ein Wiederzünden nach ca. 20 sec bei einer Versorgungsspannung von 220 V ohne zusätzlichen Zündimpuls möglich.If you only fill such lamps with mercury and noble gas, these lamps can also be used when hot, i.e. So immediately after switching off from the steady state, be ignited again with approx. 220 V without ignition pulse. For lamps that e.g. Containing iodine (NaJ, HgJ2 etc.), this immediate reignition could not be achieved when hot, but here too the time between switching off and reigniting was reduced considerably. With heated electrodes, it was possible to re-ignite after approx. 20 sec at a supply voltage of 220 V without an additional ignition pulse.
Claims (4)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3408431 | 1984-03-08 | ||
| DE19843408431 DE3408431A1 (en) | 1984-03-08 | 1984-03-08 | HEATABLE ELECTRODE FOR HIGH PRESSURE GAS DISCHARGE LAMPS |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0154383A2 true EP0154383A2 (en) | 1985-09-11 |
| EP0154383A3 EP0154383A3 (en) | 1986-11-26 |
| EP0154383B1 EP0154383B1 (en) | 1989-10-04 |
Family
ID=6229862
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP85200312A Expired EP0154383B1 (en) | 1984-03-08 | 1985-03-04 | Heatable electrode for high-pressure gas discharge lamps |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4839560A (en) |
| EP (1) | EP0154383B1 (en) |
| JP (1) | JPS60207240A (en) |
| DE (2) | DE3408431A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19538283A1 (en) * | 1995-10-16 | 1997-04-17 | Holzer Walter Prof Dr H C Ing | Cold cathode for gas discharge lamps |
| US20070035249A1 (en) * | 2005-08-10 | 2007-02-15 | Geza Cseh | Lamp with inner capsule |
| DE202005014660U1 (en) * | 2005-09-16 | 2005-12-08 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | High pressure electrical gas discharge lamp has electrode fitted with a heating filament for use in a dimmer circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1071102A (en) * | 1963-08-16 | 1967-06-07 | Sylvania Electric Prod | Electric discharge lamp |
| DE3106201A1 (en) * | 1980-02-20 | 1981-12-10 | Mitsubishi Denki K.K., Tokyo | HIGH PRESSURE GAS DISCHARGE LAMP |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1157995A (en) * | 1914-09-11 | 1915-10-26 | Gen Electric | Incandescent lamp. |
| US3519872A (en) * | 1967-05-17 | 1970-07-07 | Westinghouse Electric Corp | Thermionic electrode with an auxiliary starting coil for a discharge lamp |
-
1984
- 1984-03-08 DE DE19843408431 patent/DE3408431A1/en not_active Withdrawn
-
1985
- 1985-03-01 US US06/707,322 patent/US4839560A/en not_active Expired - Fee Related
- 1985-03-04 EP EP85200312A patent/EP0154383B1/en not_active Expired
- 1985-03-04 DE DE8585200312T patent/DE3573492D1/en not_active Expired
- 1985-03-05 JP JP60042000A patent/JPS60207240A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1071102A (en) * | 1963-08-16 | 1967-06-07 | Sylvania Electric Prod | Electric discharge lamp |
| DE3106201A1 (en) * | 1980-02-20 | 1981-12-10 | Mitsubishi Denki K.K., Tokyo | HIGH PRESSURE GAS DISCHARGE LAMP |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0154383A3 (en) | 1986-11-26 |
| DE3408431A1 (en) | 1985-09-12 |
| EP0154383B1 (en) | 1989-10-04 |
| DE3573492D1 (en) | 1989-11-09 |
| US4839560A (en) | 1989-06-13 |
| JPS60207240A (en) | 1985-10-18 |
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