EP0219860B1 - Process for manufacturing a metal halide high-pressure discharge lamp having a single pinch, and a lamp manufactured according to this process - Google Patents

Process for manufacturing a metal halide high-pressure discharge lamp having a single pinch, and a lamp manufactured according to this process Download PDF

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Publication number
EP0219860B1
EP0219860B1 EP86114647A EP86114647A EP0219860B1 EP 0219860 B1 EP0219860 B1 EP 0219860B1 EP 86114647 A EP86114647 A EP 86114647A EP 86114647 A EP86114647 A EP 86114647A EP 0219860 B1 EP0219860 B1 EP 0219860B1
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Prior art keywords
pinch
current supply
circular
supply leads
cylindrical tube
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EP86114647A
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German (de)
French (fr)
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EP0219860A2 (en
EP0219860A3 (en
Inventor
Alexander Dobrusskin
Achim Gosslar
Jürgen Dr. Heider
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Osram GmbH
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Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
    • H01J9/32—Sealing leading-in conductors
    • H01J9/323—Sealing leading-in conductors into a discharge lamp or a gas-filled discharge device
    • H01J9/326—Sealing leading-in conductors into a discharge lamp or a gas-filled discharge device making pinched-stem or analogous seals
    • 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
    • H01J61/368—Pinched seals or analogous seals

Definitions

  • JP-A-47-308 an incandescent lamp is known, in which the sealing foils within the pinch are, for example, each bent outwards by 90 °, as a result of which the distance between them is attached external power supplies enlarged.
  • Such a treatment of the sealing foils which are only a few hundredths of a millimeter thick, is conceivably unfavorable, since their durability during current passage is thereby considerably reduced.
  • Another way of leading the external power leads out of the pinch is described in DE-A-1 922 762.
  • the lamp is intended for use in an optical system. So that the luminous element can have a certain reference distance from the base end, the external power supply lines are led, for example, laterally out of the pinch, whereby the length of the pinch can subsequently be changed and adapted to the optical system.
  • a pre-crush is known from US-A-4 512 488, wherein a vacuum container is evacuated through a soldered pump tube. This pump tube is pre-squeezed to prevent breakage.
  • the pre-squeezed end of the discharge vessel can additionally be provided with slots on its narrow side surfaces.
  • a widened pinch is obtained, which is the prerequisite for an increased distance between the external power supply lines.
  • the outer power supply lines are fastened to the parallel sealing foils in such a way that their longitudinal axes form a right angle with one another.
  • the external power supplies themselves can be led out of the pinch either on the narrow side faces of the pinch or on the end face facing away from the discharge vessel, in the latter case being angled within the pinch.
  • the outer power supply lines 6' are led out of the pinch 3 '' laterally at right angles to the longitudinal axis of the lamp. They can then be angled downwards outside the pinch 3 '' (FIG. 2b) or left straight (FIG. 2c). This results in the first embodiment an additional increased high voltage strength of the lamp. This is particularly the case with the hot ignition of discharge lamps.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)

Description

Die Erfindung betrifft ein Verfahren zur Herstellung einer einseitig gequetschten Metallhalogenidhochdruckentladungslampe, deren Gefäßabdichtung als Quetschung ausgebildet ist, aus der zwei äußere Stromzuführungen herausgeführt sind und zwei innere Stromzuführungen, die mit Elektroden versehen sind, in das Entladungsgefäß ragen, wobei die elektrische Verbindung zwischen den äußeren Stromzuführungen und den zugehörigen inneren Stromzuführungen mittels parallelverlaufender Dichtungsfolien vorgenommen ist, die parallel zueinander und in einer Ebene innerhalb der Quetschung eingebettet sind, bei der im wesentlichen nacheinander folgende Arbeitsgänge ausgeführt werden:

  • Ansetzen eines Pumprohres an ein kreiszylinderförmiges Rohr,
  • Einführen von vorgefertigten Elektrodensystemen, bestehend aus den äußeren Stromzuführungen, den Dichtungsfolien und den inneren Stromzuführungen mit den Elektroden in das kreiszylinderförmige Rohr, wobei die Dichtungsfolien in dem dem Pumprohr abgewandten Teil des kreiszylinderförmigen Rohres angeordnet sind,
  • Herstellen der Quetschung im Bereich der Dichtungsfolien, wobei die Breite der Quetschung etwa gleich groß wie der Durchmesser des kreiszylinderförmigen Rohres ist, sowie
  • Einbringen der gewünschten Füllung in das Entladungsgefäß und Abschmelzen des Pumprohres.
The invention relates to a method for producing a metal halide high-pressure discharge lamp pinched on one side, the vessel seal of which is designed as a pinch, from which two outer current leads are led out and two inner current leads, which are provided with electrodes, protrude into the discharge vessel, the electrical connection between the outer current leads and the associated internal power supply is made by means of parallel sealing foils, which are embedded parallel to one another and in one plane within the pinch, in which the following operations are carried out essentially in succession:
  • Attaching a pump tube to a circular cylindrical tube,
  • Introducing prefabricated electrode systems, consisting of the outer power supply lines, the sealing foils and the inner power supply lines with the electrodes, into the circular cylindrical tube, the sealing foils being arranged in the part of the circular cylindrical tube facing away from the pump tube,
  • Production of the pinch in the area of the sealing foils, the width of the pinch being approximately the same size as the diameter of the circular-cylindrical tube, and
  • Introduce the desired filling into the discharge vessel and melt the pump tube.

Um die Dichtigkeit einer Gefäßabdichtung, bei der das Lampengefäß aus Quarzglas besteht, zu gewährleisten, werden bei Halogenglüh- und Metallhalogenidhochdruckentladungslampen anstelle drahtförmiger Stromdurchführungen Dichtungsfolien aus Molybdän verwendet. Mit zunehmend kleiner werdenden Anschlußleistungen der Lampen verringert sich auch deren geometrische Größe und damit auch die Größe der Quetschung, in der die Dichtungsfolien eingebettet sind. Dabei bereitet es häufig Schwierigkeiten, den erforderlichen Abstand der z.T. relativ breiten, parallel zueinander und in einer Ebene angeordneten Dichtungsfolien innerhalb der engen Quetschung einzuhalten. Bei Metallhalogenidhochdruckentladungslampen besteht darüber hinaus das Bedürfnis, daß zur Zündung der Lampe eine Hochspannung je nach Abkühlzustand der Lampe von mindestens 6 kVs angelegt werden muß. In der GB-A-1 442 497 wurde deshalb eine Ummantelung der schräg aus der Quetschung herausgeführten Stromzuführungen mittels Quarzröhrchen vorgeschlagen, die mit einem Füllmaterial gefüllt und mit einem Elastomer abgeschlossen sind. Hiermit ist jedoch ein hoher zusätzlicher Fertigungsaufwand verbunden, wodurch sich die Lampe überproportional verteuert. Darüber hinaus sind diese lang aus der Quetschung herausgeführten Quarzröhrchen äußerst bruchgefährdet, was die elektrische Sicherheit stark vermindert.In order to ensure the tightness of a vessel seal in which the lamp vessel is made of quartz glass, sealing foils made of molybdenum are used instead of wire-shaped current leadthroughs in halogen incandescent and metal halide high-pressure discharge lamps. As the connected load of the lamps becomes increasingly smaller, their geometric size and thus also the size of the pinch in which the sealing foils are embedded also decrease. It is often difficult to maintain the required spacing of the sealing films, some of which are relatively wide, arranged parallel to one another and in one plane, within the narrow pinch. In the case of metal halide high-pressure discharge lamps, there is also the need that a high voltage of at least 6 kV s must be applied to ignite the lamp, depending on the cooling state of the lamp. In GB-A-1 442 497, therefore, a casing of the current leads, which are led out at an angle from the pinch, by means of quartz tubes, which are filled with a filling material and sealed with an elastomer, has been proposed. However, this involves a high additional manufacturing effort, which makes the lamp more expensive. In addition, these quartz tubes, which have been led out of the pinch for a long time, are extremely prone to breakage, which greatly reduces electrical safety.

Aus dem JP-A-47-308 ist eine Glühlampe bekannt, bei der die Dichtungsfolien innerhalb der Quetschung beispielsweise jeweils um 90° nach außen gebogen sind, wodurch sich der Abstand der daran befestigten äußeren Stromzuführungen vergrößert. Eine solche Behandlung der nur wenige hundertstel Millimeter dicken Dichtungsfolien ist jedoch denkbar ungünstig, da hierdurch deren Haltbarkeit bei Stromdurchgang erheblich reduziert wird. Eine andere Art, die äußeren Stromzuführungen aus der Quetschung herauszuführen, ist in der DE-A-1 922 762 beschrieben. Die Lampe ist für den Einsatz in einem optischen System vorgesehen. Damit der Leuchtkörper einen bestimmten Bezugsabstand zum Sockelende aufweisen kann, sind die äußeren Stromzuführungen z.B. seitlich aus der Quetschung herausgeführt, wodurch die Quetschung in ihrer Länge nachträglich veränderbar und an das optische System anpaßbar ist.From JP-A-47-308 an incandescent lamp is known, in which the sealing foils within the pinch are, for example, each bent outwards by 90 °, as a result of which the distance between them is attached external power supplies enlarged. Such a treatment of the sealing foils, which are only a few hundredths of a millimeter thick, is conceivably unfavorable, since their durability during current passage is thereby considerably reduced. Another way of leading the external power leads out of the pinch is described in DE-A-1 922 762. The lamp is intended for use in an optical system. So that the luminous element can have a certain reference distance from the base end, the external power supply lines are led, for example, laterally out of the pinch, whereby the length of the pinch can subsequently be changed and adapted to the optical system.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, die Quetschung der Lampen derart zu gestalten, daß einerseits die nötige Breite der Dichtungsfolien verwendbar ist und andererseits insbesondere bei Entladungslampen die zur Zündung der Lampe erforderliche Zündhochspannung von mindestens 6 kVs angelegt werden kann. Darüber hinaus soll die Herausführung der äußeren Stromzuführungen aus der Quetschung einfacher gestaltet werden, um eine kostengünstigere Fertigung zu ermöglichen.The present invention has for its object to design the pinch of the lamps so that on the one hand the necessary width of the sealing film can be used and on the other hand the ignition high voltage required to ignite the lamp of at least 6 kV s can be applied in particular to discharge lamps. In addition, the lead-out of the external power supply lines from the pinch is to be made simpler in order to enable more cost-effective production.

Diese Aufgabe wird bei der Herstellung einer Metallhalogenidhochdruckentladungslampe mit den im Oberbegriff des Hauptanspruchs genannten Merkmalen dadurch gelöst, daß vor dem Einführen der vorgefertigten Elektrodensysteme das dem Pumprohr abgewandte, auf Verformungstemperatur erwärmte Ende des kreiszylinderförmigen Rohres mittels zweier von außen geführter, sich gegeneinander bewegender Quetschbacken vorgequetscht wird, wodurch das kreiszylinderförmige Rohr in diesem Bereich eine länglichrunde Querschnittsform annimmt, deren größerer Durchmesser größer als der Durchmesser des kreiszylinderförmigen Rohres ist. Die restlichen Arbeitsgänge bis zur Fertigstellung der Lampe bleiben unverändert.This object is achieved in the manufacture of a metal halide high-pressure discharge lamp with the features mentioned in the preamble of the main claim in that, before the introduction of the prefabricated electrode systems, the end of the circular-cylindrical tube facing away from the pump tube and heated to the deformation temperature is pre-squeezed by means of two externally guided, mutually moving pinch jaws is, whereby the circular cylindrical tube in this area assumes an elongated circular cross-sectional shape, the larger diameter of which is larger than the diameter of the circular cylindrical tube. The remaining operations until the lamp is completed remain unchanged.

Eine Vorquetschung ist bekannt aus der Patentschrift US-A-4 512 488, wobei ein Vakuumbehälter durch ein angelötetes Pumprohr evakuiert wird. Dieses Pumprohr ist vorgequetscht um einen Bruch vorzubeugen.A pre-crush is known from US-A-4 512 488, wherein a vacuum container is evacuated through a soldered pump tube. This pump tube is pre-squeezed to prevent breakage.

In einer Erweiterung dieses Verfahrens kann das vorgequetschte Ende des Entladungsgefäßes an dessen schmalen Seitenflächen zusätzlich mit Schlitzen versehen werden. Mit beiden Verfahren erhält man eine verbreiterte Quetschung, die die Voraussetzung für einen vergrößerten Abstand der äußeren Stromzuführungen bildet. Eine solche Verbreiterung der Quetschung ist schnell und kostengünstig herstellbar. Die äußeren Stromzuführungen sind an den parallelverlaufenden Dichtungsfolien derart befestigt, daß ihre Längsachsen miteinander einen rechten Winkel bilden. Die äußeren Stromzuführungen selbst können dabei entweder an den schmalen Seitenflächen der Quetschung oder an der dem Entladungsgefäß abgewandten Stirnfläche aus der Quetschung herausgeführt sein, wobei sie im letzteren Fall innerhalb der Quetschung abgewinkelt sind.In an extension of this method, the pre-squeezed end of the discharge vessel can additionally be provided with slots on its narrow side surfaces. With both methods, a widened pinch is obtained, which is the prerequisite for an increased distance between the external power supply lines. Such a widening of the bruise can be produced quickly and inexpensively. The outer power supply lines are fastened to the parallel sealing foils in such a way that their longitudinal axes form a right angle with one another. The external power supplies themselves can be led out of the pinch either on the narrow side faces of the pinch or on the end face facing away from the discharge vessel, in the latter case being angled within the pinch.

Die Erfindung wird nachstehend an Hand von zwei Figuren erläutert, in denen Arbeitsgänge für alternative Ausführungsformen schematisch dargestellt sind:

Figuren 1a bis 1e
zeigen die wesentlichen Fertigungsstufen für eine Metallhalogenidhochdruckentladungslampe in einer ersten Ausführungsform
Figuren 2a bis 2c
zeigen die alternativen Fertigungsstufen für eine Metallhalogenidhochdruckentladungslampe in einer zweiten Ausführungsform

Die Darstellungen der Figuren 1a und 1b zeigen ein kreiszylinderförmiges Quarzrohr 1, an das stirnseitig ein Pumprohr 2 angesetzt ist, in der Haupt- und Seitenansicht (von rechts betrachtet). In den Figuren 1c und 1d ist das dem Pumprohr 2 abgewandte Ende 3 des Quarzrohres 1 vorgequetscht, wodurch dieses eine länglichrunde Querschnittsform aufweist, deren größerer Durchmesser durch diesen Vorgang ein gegenüber dem ursprünglichen Durchmesser vergrößertes Maß erhält. Der verbleibende, dem Pumprohr zugewandte Teil 4 des Quarzrohres 1 bildet das zukünftige Entladungsgefäß und behält hierbei seine kreisrunde Form. Im Bild 1e ist die fertige Lampe 5 dargestellt. In den dazwischenliegenden Fertingungsstufen wurden in den vorgequetschten Teil 3 die zwei Elektrodensysteme eingeführt, die jeweils aus einer äußeren Stromzuführung 6, einer inneren Stromzuführung 7 aus Wolfram, die mit ihrem im Entladungsgefäß 4' befindlichen Ende als hakenförmige Elektrode 8 ausgebildet ist, sowie einer die äußere Stromzuführung 6 und die innere Stromzuführung 7 verbindenden Dichtungsfolie 9 aus Molybdän bestehen. Durch einen zweiten Quetschvorgang ensteht die endgültige Gefäßabdichtung in Form einer Quetschung, deren Breite etwa auf das ursprüngliche Maß des kreiszylinderförmigen Rohres 1 und somit den Außendurchmesser des Entladungsgefäßes 4' gebracht wird. Zuletzt wurde das Entladungsgefäß 4' mit der gewünschten Füllung versehen und das noch verbliebene Pumprohr 2 abgeschmolzen, wobei nur noch eine Pumpspitze 2' verbleibt. In weiterer Übereinstimmung mit der Erfindung sind die äußeren Stromzuführungen 6 an den Enden der parallelverlaufenden Dichtungsfolien 9 einen rechten Winkel bildend angeschweißt und innerhalb der Quetschung 3' nach unten abgewinkelt, so daß sie an der dem Entladungsgefäß 4' abgewandten Stirnfläche 10 die Quetschung 3' parallelverlaufend verlassen. Hierdurch wird eine weitere Vergrößerung des Abstandes beider äußerer Stromzuführungen 6 zueinander erzielt, wodurch die Hochspannungsfestigkeit der Lampe während des Zündvorganges weiter gesteigert wird.The invention is explained below with reference to two figures, in which operations for alternative embodiments are shown schematically:
Figures 1a to 1e
show the essential manufacturing stages for a metal halide high-pressure discharge lamp in a first embodiment
Figures 2a to 2c
show the alternative manufacturing stages for a metal halide high pressure discharge lamp in a second embodiment

The representations of FIGS. 1a and 1b show a circular-cylindrical quartz tube 1, to which a pump tube 2 is attached at the end, in the main and side view (viewed from the right). In FIGS. 1c and 1d, the end 3 of the quartz tube 1 facing away from the pump tube 2 is pre-squeezed, as a result of which this has an elongated, round cross-sectional shape, the larger diameter of which is increased by this process compared to the original diameter. The remaining part 4 of the quartz tube 1 facing the pump tube forms the future discharge vessel and in doing so maintains its circular shape. The finished lamp 5 is shown in Figure 1e. In the intermediate production stages, the two electrode systems were introduced into the pre-squeezed part 3, each consisting of an outer power supply 6, an inner power supply 7 made of tungsten, which is designed as a hook-shaped electrode 8 with its end located in the discharge vessel 4 ', and one the outer one Power supply 6 and the inner power supply 7 connecting sealing film 9 consist of molybdenum. A second squeezing process produces the final vessel seal in the form of a squeeze, the width of which is brought approximately to the original dimension of the circular-cylindrical tube 1 and thus the outer diameter of the discharge vessel 4 '. Finally, the discharge vessel 4 'was provided with the desired filling and the remaining one Pump tube 2 melted, leaving only one pump tip 2 '. In accordance with the invention, the outer power supply lines 6 are welded to the ends of the parallel sealing films 9 forming a right angle and angled downward within the pinch 3 'so that they run parallel to the pinch 3' on the end face 10 facing away from the discharge vessel 4 ' leave. As a result, the distance between the two external power supply lines 6 is further increased, as a result of which the high voltage strength of the lamp is further increased during the ignition process.

Die ersten beiden Verfahrensschritte der zweiten Ausführungsform (Figur 2) sind mit denen aus der Figur 1a bis 1d identisch und nicht noch einmal wiedergegeben. Die Figur 2a schließt sich an den in Figur 1d beschriebenen Verfahrensschritt an und entspricht der Draufsicht der Figur 1d. Der vorgequetschte Teil 3 ist hier an jeder schmalen Seitenfläche 11 mit zusätzlichen Schlitzen 12 versehen. In diese Schlitze 12 werden vor dem endgültigen, den Entladungsraum 4' abdichtenden Quetschvorgang die Elektrodensysteme eingeführt, die wie im vorangegangenen Beispiel aus den äußeren Stromzuführungen 6', den inneren Stromzuführungen 7 aus Wolfram mit den Elektroden 8 sowie den parallelverlaufenden Dichtungsfolien 9 aus Molybdän bestehen. Bei der fertigen Lampe 5' sind die äußeren Stromzuführungen 6' seitlich im rechten Winkel zur Lampenlängsachse aus der Quetschung 3'' herausgeführt. Sie können dann außerhalb der Quetschung 3'' nach unten abgewinkelt (Figur 2b) oder gerade belassen werden (Figur 2c). Hierdurch ergibt sich gegenüber der ersten Ausführungsform eine zusätzlich gesteigerte Hochspannungsfestigkeit der Lampe. Das ist insbesondere bei der Heißzündung von Entladungslampen der Fall.The first two process steps of the second embodiment (FIG. 2) are identical to those from FIGS. 1a to 1d and are not shown again. FIG. 2a follows the method step described in FIG. 1d and corresponds to the top view of FIG. 1d. The pre-squeezed part 3 is provided with additional slots 12 on each narrow side surface 11. The electrode systems which, as in the previous example, consist of the outer current leads 6 ', the inner current leads 7 made of tungsten with the electrodes 8 and the sealing films 9 running in parallel made of molybdenum, are introduced into these slots 12 before the final squeezing process which seals the discharge space 4'. In the finished lamp 5 ', the outer power supply lines 6' are led out of the pinch 3 '' laterally at right angles to the longitudinal axis of the lamp. They can then be angled downwards outside the pinch 3 '' (FIG. 2b) or left straight (FIG. 2c). This results in the first embodiment an additional increased high voltage strength of the lamp. This is particularly the case with the hot ignition of discharge lamps.

Claims (5)

  1. Method for the production of a metal-halide high-pressure discharge lamp pinched at one end whose vessel seal is formed as a pinch (3', 3") from which two external current supply leads (6, 6') are brought out and two internal current supply leads (7) provided with electrodes (8) project into the discharge vessel (4'), the electrical connection between the external current supply leads (6, 6') and the associated internal current supply leads (7) being made by means of sealing foils (9) which extend in parallel, which are parallel to each other and are embedded in one plane inside the pinch (3', 3"), in which method the following operations are performed essentially in sequence:
    a) Attachment of a pump tube (2) to a circular-cylindrical tube (1),
    b) Introduction of prefabricated electrode systems comprising the external current supply leads (6, 6'), the sealing foils (9) and the internal current supply leads (7) with the electrodes (8) into the circular-cylindrical tube (1), the sealing. foils (9) being disposed in the part of the circular-cylindrical tube (1) remote from the pump tube (2),
    c) Production of the pinch (3', 3") in the region of the sealing foils (9), the width of the pinch (3', 3) being approximately equally as large as the external diameter of the circular-cylindrical tube (1), and
    d) Introduction of the desired filling into the discharge vessel (4') and sealing-off of the pump tubes (2),
    characterised in that, before the introduction of the prefabricated electrode system, the end (3) of the circular-cylindrical tube (1) remote from the pump tube (2) and heated to deformation temperature is pre-pinched by means of two externally guided pinch jaws which move with respect to one another, as a result of which the circular-cylindrical tube assumes, in this region, an elongated round cross-sectional shape having a cylindrical form whose greater diameter is greater than the diameter of the circular-cylindrical tube (1).
  2. Method for the production of a single-ended pinched metal-halide high-pressure discharge lamp according to Claim 1, characterised in that, after the prepinching and before the introduction of the prefabricated electrode systems, slots (12) are provided at the narrow side faces (11) of the pre-pinched end (3) of the tube (1).
  3. Metal-halide high-pressure discharge lamp produced by the method of Claim 1 or 2, characterised in that the longitudinal axes of the external current supply leads (6, 6') and of the sealing foils (9) form a right angle at their joint inside the pinch (3', 3").
  4. Metal-halide high-pressure discharge lamp-according to Claim 3, characterised in that the external current supply leads (6) are brought out in parallel and at the end face (10) of the pinch (3') remote from the discharge space (4'), the spacing of their longitudinal axes being greater than the spacing of the longitudinal axes of the sealing foils (9) and smaller than the width of the pinch (3').
  5. Metal-halide high-pressure discharge lamp according to claim 3, characterised in that one of the external current supply leads (6') is in each case brought out of the pinch (3") at a narrow side face (11) adjacent to the discharge space (4') at a right angle to the longitudinal axis of the lamp.
EP86114647A 1985-10-24 1986-10-22 Process for manufacturing a metal halide high-pressure discharge lamp having a single pinch, and a lamp manufactured according to this process Expired - Lifetime EP0219860B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853537878 DE3537878A1 (en) 1985-10-24 1985-10-24 METHOD FOR PRODUCING A SINGLE-SIDED CRUSHED METAL HALOGENIDE HIGH PRESSURE DISCHARGE LAMP AND A LAMP PRODUCED BY THIS METHOD
DE3537878 1985-10-24

Publications (3)

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EP0219860A2 EP0219860A2 (en) 1987-04-29
EP0219860A3 EP0219860A3 (en) 1989-05-03
EP0219860B1 true EP0219860B1 (en) 1992-06-17

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US (1) US4739220A (en)
EP (1) EP0219860B1 (en)
JP (1) JPH0656736B2 (en)
DE (2) DE3537878A1 (en)

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* Cited by examiner, † Cited by third party
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US4998036A (en) * 1987-12-17 1991-03-05 Kabushiki Kaisha Toshiba Metal vapor discharge lamp containing an arc tube with particular bulb structure
US5037342A (en) * 1988-11-15 1991-08-06 Patent Treuhand Gesellschaft Fur Elektrische Gluhlampen M.B.H. Method of making an electric lamp, and more particularly a lamp vessel in which electrodes are retained in the lamp by a pinch or press seal
EP0381035B1 (en) * 1989-01-31 1994-08-03 Toshiba Lighting & Technology Corporation Single side-sealed metal vapor discharge lamp
DD280630A1 (en) * 1989-03-14 1990-07-11 Narva Gluehlampen SINGLE-SIDED DISCHARGE LAMP WITH ENHANCED HIGH VOLTAGE STRENGTH
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JPH0656736B2 (en) 1994-07-27
DE3685714D1 (en) 1992-07-23
DE3537878A1 (en) 1987-04-30
US4739220A (en) 1988-04-19
EP0219860A2 (en) 1987-04-29
EP0219860A3 (en) 1989-05-03
JPS62100930A (en) 1987-05-11

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