EP0566975B1 - Single-ended high pressure discharge lamp - Google Patents

Single-ended high pressure discharge lamp Download PDF

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Publication number
EP0566975B1
EP0566975B1 EP93106061A EP93106061A EP0566975B1 EP 0566975 B1 EP0566975 B1 EP 0566975B1 EP 93106061 A EP93106061 A EP 93106061A EP 93106061 A EP93106061 A EP 93106061A EP 0566975 B1 EP0566975 B1 EP 0566975B1
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EP
European Patent Office
Prior art keywords
cap
pressure discharge
discharge lamp
base
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.)
Expired - Lifetime
Application number
EP93106061A
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German (de)
French (fr)
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EP0566975A1 (en
Inventor
Wolfgang Greiler
Bernd Lewandowski
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Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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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
    • H01J61/36—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
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/50—Means forming part of the tube or lamps for the purpose of providing electrical connection to it
    • H01J5/54—Means forming part of the tube or lamps for the purpose of providing electrical connection to it supported by a separate part, e.g. base

Definitions

  • the invention relates to a high-pressure discharge lamp with a base on one side, according to the preamble of protection claim 1.
  • Such high-pressure discharge lamps are disclosed, for example, in GB-PS 2 100 404.
  • high-pressure discharge lamps require a considerably higher ignition voltage in the hot state than in the cold state. This means that if a high-pressure discharge lamp is to be started again immediately after it has been switched off, a much higher ignition voltage must be made available than in the cooled state. For many applications, high-pressure discharge lamps are desired which have this ability to re-ignite and can thus be switched on and off at will without waiting for the cooling phase. However, particularly high demands are made of the high-voltage strength of the base for such lamps.
  • GB-PS 2 100 404 describes a high-pressure discharge lamp with a base on one side, which has a lamp base with improved high-voltage strength and which is therefore hot re-ignitable. This is made possible by a ceramic separator, which is located between the contact pins protruding from the lamp base and the lamp power supply lines is located and which is either formed as part of the socket and engages in a slot of the lamp base between the contact pins, or is made in one piece with the ceramic base and engages in a fitting recess in the lamp socket.
  • US Pat. No. 4,542,316 discloses a high-pressure discharge lamp with a base on one side, which is also hot-re-ignitable and whose lamp base has improved high-voltage insulation. There is an axially extending separator made of mica inside the base, which prevents spray discharges and leakage currents between the current leads.
  • the single-ended high-pressure discharge lamps described in the prior art cited above have a base whose high-voltage insulation is sufficient to enable hot re-ignition in the case of high-pressure discharge lamps of low and medium electrical power consumption.
  • tests have shown that the high-voltage strength of these lamp bases according to the prior art is still too low to also ensure hot re-ignition in high-wattage, single-ended high-pressure discharge lamps.
  • High-wattage single-ended high-pressure discharge lamps with an electrical power consumption of approx. 6,000 to 12,000 W require electrical voltages of up to 70,000 V for hot re-ignition.
  • the additional separating webs according to the invention made of electrically insulating material prevent undesirable leakage currents within the base and spray discharges between the current leads and the contacts.
  • the further separating webs extend in the axial direction from the front base wall to approximately the crimped end of the lamp bulb, which is fixed in the base.
  • the paths for leakage currents between the current leads within the base are considerably extended.
  • the current-carrying parts within the base are better shielded from one another by these further separating webs, so that no spray discharges take place between them.
  • the base has a nose-like recess between its contacts, in which a frame web engages in a fitting manner. This prevents leakage current between the contacts along the base and socket body interface.
  • FIG. 1 shows the structure of a high-pressure discharge lamp according to the invention which is capped on one side.
  • the high-pressure discharge lamp has a discharge vessel 1 made of quartz glass, in which an ionizable filling gas and two electrodes 2 are enclosed.
  • the discharge vessel 1 is held in an evacuated outer bulb 4 by means of a two-part frame 3a, 3b.
  • a frame bracket 3a is partially surrounded by a quartz glass tube 3c, which is melted into one end 4a of the outer bulb 4.
  • the outer bulb 4 is essentially axially symmetrical and has a crimped end 4a with which it is cemented in a ceramic base 5, which consists of two identical halves 5a, 5b which are screwed together.
  • the base area is in FIG. 1 shown cut.
  • two molybdenum foils 6a, 6b are melted in a gas-tight manner, each producing an electrically conductive connection between a part of the frame 3a or 3b and a power supply 7a or 7b protruding from the crimped end 4a.
  • the two power supply lines 7a, 7b run inside the base 5 and are each connected to a metallic contact pin 8a, 8b led out of the base 5.
  • the base 5 has on its end face 5c, which lies opposite the crimped end 4a, a nose-like recess 9, in which a fit-shaped web of a socket body (not shown) engages.
  • a separating web 10 made of mica which runs centrally between the current leads 7a, 7b in the axial direction. This separating web 10 engages in a slot 11 in the crimped end 4a of the outer bulb 4 and extends to the end wall 5c of the base 5.
  • the separating web 10 which is designed here as a mica plate, is fixed in slot-like depressions 12 in the base wall.
  • a further separating web 13 runs in the interior of the base 5, which extends in the axial direction from the end-side base wall 5c to approximately the middle of the dividing web 10. Since the separating web 10 disappears almost up to half in the pinch slot 11, the further dividing webs 13 extend axially Direction also almost to the crimped end 4a of the outer bulb 4.
  • These further separating webs 13 likewise consist of a mica plate and are also fixed in slot-like recesses 14 in the wall of the base body 5.
  • the additional separators 13 form an acute angle with the centrally arranged separator 10, so that in each case only a small gap remains between the separators 10, 13.
  • the high-pressure discharge lamp described here in the exemplary embodiment is a lamp with a power consumption of 6,000 W.
  • the lamp base according to the invention has a high-voltage strength of more than 70,000 V.
  • Figure 4 shows a cross section through the lamp base 5 according to a second embodiment.
  • This second exemplary embodiment differs from the first only by two approximately axially extending air channels 17, 18 in the lamp base 5.
  • the air channels 17, 18 are formed by the wall of the nose-like recess 9 and by the separating webs 10 and 13 fixed in the recesses 12 and 14, respectively educated. They allow a cooling air flow G through the lamp base 5 and thus allow cooling of the pinch end 4a of the lamp.
  • the lamp base according to the invention can also be used for single-ended high-pressure discharge lamps with an even greater output, for example 12 kW.

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  • Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)

Description

Die Erfindung betrifft eine einseitig gesockelte Hochdruckentladungslampe gemäß des Oberbegriffs des Schutzanspruchs 1.The invention relates to a high-pressure discharge lamp with a base on one side, according to the preamble of protection claim 1.

Derartige Hochdruckentladungslampen sind beispielsweise in der GB-PS 2 100 404 offenbart.Such high-pressure discharge lamps are disclosed, for example, in GB-PS 2 100 404.

Bekanntlich benötigen Hochdruckentladungslampen im heißen Zustand eine erheblich höhere Zündspannung als im kalten Zustand. D.h., daß einer Hochdruckentladungslampe, wenn sie unmittelbar nach dem Ausschalten erneut gestartet werden soll, eine wesentlich höhere Zündspannung zur Verfügung gestellt werden muß als im abgekühlten Zustand. Für viele Anwendungen werden Hochdruckentladungslampen gewünscht, die diese Fähigkeit zur Heißwiederzündung besitzen und damit nach Belieben aus- und eingeschaltet werden können, ohne die Abkühlphase abzuwarten. An die Hochspannungsfestigkeit der Sockel für solche Lampen werden allerdings besonders hohe Anforderungen gestellt.As is known, high-pressure discharge lamps require a considerably higher ignition voltage in the hot state than in the cold state. This means that if a high-pressure discharge lamp is to be started again immediately after it has been switched off, a much higher ignition voltage must be made available than in the cooled state. For many applications, high-pressure discharge lamps are desired which have this ability to re-ignite and can thus be switched on and off at will without waiting for the cooling phase. However, particularly high demands are made of the high-voltage strength of the base for such lamps.

In der GB-PS 2 100 404 wird eine einseitig gesockelte Hochdruckentladungslampe beschrieben, die einen Lampensockel mit einer verbesserten Hochspannungsfestigkeit besitzt und die daher heißwiederzündfähig ist. Dieses wird durch einen Trennsteg aus Keramik ermöglicht, der sich zwischen den aus dem Lampensockel herausragenden Kontaktstiften und den Lampenstromzuführungen befindet und der entweder als Bestandteil der Fassung ausgebildet ist und in einen Schlitz des Lampensockels zwischen den Kontaktstiften eingreift, oder der einteilig mit dem Keramiksockel ausgeführt ist und in eine paßgerechte Vertiefung der Lampenfassung eingreift.GB-PS 2 100 404 describes a high-pressure discharge lamp with a base on one side, which has a lamp base with improved high-voltage strength and which is therefore hot re-ignitable. This is made possible by a ceramic separator, which is located between the contact pins protruding from the lamp base and the lamp power supply lines is located and which is either formed as part of the socket and engages in a slot of the lamp base between the contact pins, or is made in one piece with the ceramic base and engages in a fitting recess in the lamp socket.

In der US-PS 4 542 316 wird eine einseitig gesockelte Hochdruckentladungslampe offenbart, die ebenfalls heißwiederzündfähig ist und deren Lampensockel eine verbesserte Hochspannungsisolierung aufweist. Innerhalb des Sockels befindet sich zwischen den Stromzuführungen ein axial verlaufender Trennsteg aus Glimmer, der Sprühentladungen und Kriechströme zwischen den Stromzuführungen verhindert.US Pat. No. 4,542,316 discloses a high-pressure discharge lamp with a base on one side, which is also hot-re-ignitable and whose lamp base has improved high-voltage insulation. There is an axially extending separator made of mica inside the base, which prevents spray discharges and leakage currents between the current leads.

Die im oben zitierten Stand der Technik beschriebenen, einseitig gesockelten Hochdruckentladungslampen besitzen einen Sockel, dessen Hochspannungsisolierung ausreicht, um bei Hochdruckentladungslampen niederer und mittlerer elektrischer Leistungsaufnahme die Heißwiederzündung zu ermöglichen. Versuche haben allerdings gezeigt, daß die Hochspannungsfestigkeit dieser Lampensockel gemäß des Standes der Technik noch zu gering ist, um auch eine Heißwiederzündung bei hochwattigen, einseitig gesockelten Hochdruckentladungslampen zu gewährleisten. Hochwattige einseitig gesockelte Hochdruckentladungslampen mit einer elektrischen Leistungsaufnahme von ca. 6.000 bis 12.000 W benötigen zur heißen Neuzündung elektrische Spannungen von bis zu 70.000 V.The single-ended high-pressure discharge lamps described in the prior art cited above have a base whose high-voltage insulation is sufficient to enable hot re-ignition in the case of high-pressure discharge lamps of low and medium electrical power consumption. However, tests have shown that the high-voltage strength of these lamp bases according to the prior art is still too low to also ensure hot re-ignition in high-wattage, single-ended high-pressure discharge lamps. High-wattage single-ended high-pressure discharge lamps with an electrical power consumption of approx. 6,000 to 12,000 W require electrical voltages of up to 70,000 V for hot re-ignition.

Es ist die Aufgabe der Erfindung, eine einseitig gesockelte Hochdruckentladungslampe bereitzustellen, deren Lampensockel eine erhöhte Hochspannungsfestigkeit aufweist, so daß auch bei einseitig gesockelten Hochdruckentladungslampen hoher Leistung, d.h., insbesondere bei Lampen mit einer elektrischen Leistungsaufnahme von ca 6.000 W und mehr, eine Heißwiederzündung möglich wird.It is the object of the invention to provide a single-ended high-pressure discharge lamp, the lamp base of which has an increased high-voltage strength, so that even with single-ended high-pressure discharge lamps of high power, ie, in particular with lamps with an electrical power consumption of approximately 6,000 W and more, hot re-ignition is possible .

Diese Aufgabe wird erfindungsgemäß durch den Schutzanspruch 1 gelöst. Besonders vorteilhafte Ausführungen der Erfindung sind in den Unteransprüchen beschrieben.This object is achieved by the protection claim 1. Particularly advantageous embodiments of the invention are described in the subclaims.

Die erfindungsgemäßen zusätzlichen Trennstege aus elektrisch isolierendem Material verhindern unerwünschte Kriechströme innerhalb des Sockels und Sprühentladungen zwischen den Stromzuführungen und den Kontakten. Vorteilhafterweise erstrecken sich die weiteren Trennstege in axialer Richtung von der stirnseitigen Sockelwandung bis etwa zum gequetschten Ende des Lampenkolbens, das im Sockel fixiert ist. Dadurch werden die Wege für Kriechströme zwischen den Stromzuführungen innerhalb des Sockels erheblich verlängert. Außerdem werden durch diese weiteren Trennstege die stromführenden Teile innerhalb des Sockels besser gegeneinander abgeschirmt, so daß keine Sprühentladungen zwischen ihnen stattfinden.
Der Sockel weist zwischen seinen Kontakten eine nasenartige Vertiefung auf, in die ein Fassungssteg paßgerecht eingreift. Dadurch wird ein Kriechstrom zwischen den Kontakten entlang der Grenzfläche von Sockel- und Fassungskörper unterbunden.The additional separating webs according to the invention made of electrically insulating material prevent undesirable leakage currents within the base and spray discharges between the current leads and the contacts. Advantageously, the further separating webs extend in the axial direction from the front base wall to approximately the crimped end of the lamp bulb, which is fixed in the base. As a result, the paths for leakage currents between the current leads within the base are considerably extended. In addition, the current-carrying parts within the base are better shielded from one another by these further separating webs, so that no spray discharges take place between them.
The base has a nose-like recess between its contacts, in which a frame web engages in a fitting manner. This prevents leakage current between the contacts along the base and socket body interface.

Die Erfindung wird nachstehend anhand eines besonders bevorzugten Ausführungsbeispiels näher erläutert. Es zeigen:

Figur 1
eine erfindungsgemäße, einseitig gesockelte Hochdruckentladungslampe entsprechend eines besonders bevorzugten Ausführungsbeispiels (teilweise geschnitten)
Figur 2
einen Querschnitt durch den Sockel der Lampe aus Figur 1
Figur 3
eine perspektivische Darstellung der beiden Hälften des Sockelkörpers der Lampe aus Figur 1
Figur 4
einen Querschnitt durch den Sockel der Lampe gemäß eines zweiten Ausführungsbeispiels.
The invention is explained below with reference to a particularly preferred embodiment. Show it:
Figure 1
an inventive, single-ended high-pressure discharge lamp according to a particularly preferred embodiment (partially cut)
Figure 2
2 shows a cross section through the base of the lamp from FIG. 1
Figure 3
2 shows a perspective illustration of the two halves of the base body of the lamp from FIG. 1
Figure 4
a cross section through the base of the lamp according to a second embodiment.

In Figur 1 ist der Aufbau einer erfindungsgemäßen, einseitig gesockelten Hochdruckentladungslampe dargestellt. Die Hochdruckentladungslampe besitzt ein Entladungsgefäß 1 aus Quarzglas, in dem ein ionisierbares Füllgas und zwei Elektroden 2 eingeschlossen sind. Das Entladungsgefäß 1 wird mittels eines zweiteiligen Gestells 3a, 3b in einem evakuierten Außenkolben 4 gehaltert. Ein Gestellbügel 3a ist teilweise von einem Quarzglasrohr 3c umhüllt, das in einem Ende 4a des Außenkolbens 4 eingeschmolzen ist. Der Außenkolben 4 ist im wesentlichen axialsymmetrisch und weist ein gequetschtes Ende 4a auf, mit dem er in einem Keramiksockel 5 eingekittet ist, der aus zwei identischen Hälften 5a, 5b besteht, die miteinander verschraubt sind. Der Sockelbereich ist in der Figur 1 geschnitten dargestellt. Im gequetschten Ende 4a sind zwei Molybdänfolien 6a, 6b gasdicht eingeschmolzen, die jeweils eine elektrisch leitende Verbindung zwischen je einem Teil des Gestells 3a bzw. 3b und einer aus dem gequetschten Ende 4a herausragenden Stromzuführung 7a bzw. 7b herstellen.
Die beiden Stromzuführungen 7a, 7b verlaufen innerhalb des Sockels 5 und sind jeweils mit einem aus dem Sockel 5 herausgeführten metallischen Kontaktstift 8a, 8b verbunden.
Zwischen den Kontaktstiften 8a, 8b weist der Sockel 5 an seiner Stirnseite 5c, die dem gequetschten Ende 4a gegenüberliegt, eine nasenartige Ausnehmung 9 auf, in die ein paßgerecht geformter Steg eines Fassungskörpers (nicht abgebildet) eingreift.FIG. 1 shows the structure of a high-pressure discharge lamp according to the invention which is capped on one side. The high-pressure discharge lamp has a discharge vessel 1 made of quartz glass, in which an ionizable filling gas and two electrodes 2 are enclosed. The discharge vessel 1 is held in an evacuated outer bulb 4 by means of a two-part frame 3a, 3b. A frame bracket 3a is partially surrounded by a quartz glass tube 3c, which is melted into one end 4a of the outer bulb 4. The outer bulb 4 is essentially axially symmetrical and has a crimped end 4a with which it is cemented in a ceramic base 5, which consists of two identical halves 5a, 5b which are screwed together. The base area is in FIG. 1 shown cut. In the crimped end 4a, two molybdenum foils 6a, 6b are melted in a gas-tight manner, each producing an electrically conductive connection between a part of the frame 3a or 3b and a power supply 7a or 7b protruding from the crimped end 4a.
The two power supply lines 7a, 7b run inside the base 5 and are each connected to a metallic contact pin 8a, 8b led out of the base 5.
Between the contact pins 8a, 8b, the base 5 has on its end face 5c, which lies opposite the crimped end 4a, a nose-like recess 9, in which a fit-shaped web of a socket body (not shown) engages.

Innerhalb des Sockels 5 ist ein mittig zwischen den Stromzuführungen 7a, 7b in axialer Richtung verlaufender Trennsteg 10 aus Glimmer angeordnet. Dieser Trennsteg 10 greift in einen Schlitz 11 im gequetschten Ende 4a des Außenkolbens 4 ein und erstreckt sich bis zur stirnseitigen Wandung 5c des Sockels 5.Arranged within the base 5 is a separating web 10 made of mica which runs centrally between the current leads 7a, 7b in the axial direction. This separating web 10 engages in a slot 11 in the crimped end 4a of the outer bulb 4 and extends to the end wall 5c of the base 5.

Fixiert wird der Trennsteg 10, der hier als Glimmerplatte ausgeführt ist, in schlitzartigen Vertiefungen 12 in der Sockelwandung.The separating web 10, which is designed here as a mica plate, is fixed in slot-like depressions 12 in the base wall.

Zu beiden Seiten der nasenartigen Ausnehmung 9 verlaufen im Innern des Sockels 5 je ein weiterer Trennsteg 13, die sich in axialer Richtung von der stirnseitigen Sockelwand 5c bis etwa zur Mitte des Trennsteges 10 erstrecken. Da der Trennsteg 10 beinahe bis zur Hälfte im Quetschungsschlitz 11 verschwindet, erstrecken sich die weiteren Trennstege 13 in axialer Richtung auch fast bis zum gequetschten Ende 4a des Außenkolbens 4. Diese weiteren Trennstege 13 bestehen ebenfalls aus einer Glimmerplatte und sind auch in schlitzartigen Ausnehmungen 14 in der Wandung des Sockelkörpers 5 fixiert. Die zusätzlichen Trennstege 13 bilden mit dem mittig angeordneten Trennsteg 10 einen spitzen Winkel , so daß jeweils nur ein kleiner Spalt zwischen den Trennstegen 10, 13 verbleibt.On each side of the nose-like recess 9, a further separating web 13 runs in the interior of the base 5, which extends in the axial direction from the end-side base wall 5c to approximately the middle of the dividing web 10. Since the separating web 10 disappears almost up to half in the pinch slot 11, the further dividing webs 13 extend axially Direction also almost to the crimped end 4a of the outer bulb 4. These further separating webs 13 likewise consist of a mica plate and are also fixed in slot-like recesses 14 in the wall of the base body 5. The additional separators 13 form an acute angle with the centrally arranged separator 10, so that in each case only a small gap remains between the separators 10, 13.

Bei der hier im Ausführungsbeispiel beschriebenen Hochdruckentladungslampe handelt es sich um eine Lampe mit einer Leistungsaufnahme von 6.000 W. Ihr erfindungsgemäßer Lampensockel besitzt eine Hochspannungsfestigkeit von mehr als 70.000 V.The high-pressure discharge lamp described here in the exemplary embodiment is a lamp with a power consumption of 6,000 W. The lamp base according to the invention has a high-voltage strength of more than 70,000 V.

Figur 4 zeigt einen Querschnitt durch den Lampensockel 5 gemäß eines zweiten Ausführungsbeispiels. Dieses zweite Ausführungsbeispiel unterscheidet sich vom ersten nur durch zwei annähernd axial verlaufende Luftkanäle 17, 18 im Lampensockel 5. Die Luftkanäle 17, 18 werden durch die Wandung der nasenartigen Ausnehmung 9 und durch die in den Vertiefungen 12 bzw. 14 fixierten Trennstege 10 bzw. 13 gebildet. Sie ermöglichen einen Kühlluftstrom G durch den Lampensockel 5 und erlauben so eine Kühlung des Quetschendes 4a der Lampe.Figure 4 shows a cross section through the lamp base 5 according to a second embodiment. This second exemplary embodiment differs from the first only by two approximately axially extending air channels 17, 18 in the lamp base 5. The air channels 17, 18 are formed by the wall of the nose-like recess 9 and by the separating webs 10 and 13 fixed in the recesses 12 and 14, respectively educated. They allow a cooling air flow G through the lamp base 5 and thus allow cooling of the pinch end 4a of the lamp.

Die Erfindung beschränkt sich allerdings nicht auf die angegebenen Ausführungsbeispiele. Der erfindungsgemäße Lampensockel kann auch für einseitig gesockelte Hochdruckentladungslampen mit noch größerer Leistung, beispielsweise 12 kW, verwendet werden.However, the invention is not limited to the exemplary embodiments specified. The lamp base according to the invention can also be used for single-ended high-pressure discharge lamps with an even greater output, for example 12 kW.

Claims (7)

  1. Single-cap high-pressure discharge lamp having
    - an essentially axially symmetric lamp bulb (4) which has a pinched end (4a) with molybdenum foils (6a, 6b) which are sealed gastight, there being lead out from the pinched end (4a) two supply leads (7a, 7b) which are connected in an electrically conductive fashion respectively to one of the sealed molybdenum foils (6a, 6b).
    - a ceramic cap (5) in which the lamp bulb (4) is fixed with its pinched end (4a), the cap (5) having an end-side wall (5c) which is situated opposite the pinched end (4a) fixed in the cap (5),
    - two contacts (8a, 8b) which project from the cap (5) and which are connected in an electrically conductive fashion respectively to one of the supply leads (7a, 7b),
    - a separating web (10), made from electrically insulating material, extending in the middle between the supply leads (7a, 7b) and between the contacts (8a, 8b) in an axial direction,
    - a nose-type recess (9) arranged in the middle in the cap (5) between the contacts (8a, 8b),
    characterized in that further separating webs (13) made from an electrically insulating material are fitted inside the cap (5), between the supply leads (7a, 7b) and/or between the contacts (8a, 8b), on both sides of the axially extending separating web (10) arranged in the middle between the supply leads (7a, 7b).
  2. Single-cap high-pressure discharge lamp according to Claim 1, characterized in that the further separating webs (13) are arranged on both sides of the nose-type recess (9).
  3. Single-cap high-pressure discharge lamp according to Claim 1, characterized in that the further separating webs (13) extend in an axial direction up to the end-side wall (5c) of the cap (5).
  4. Single-cap high-pressure discharge lamp according to Claim 1, characterized in that the further separating webs (13) extend from the end face (5c) of the cap (5) up to half the height of the axially extending separating web (10) arranged in the middle between the supply leads (7a, 7b) and form an acute angle with said separating web (10).
  5. Single-cap high-pressure discharge lamp according to Claim 1, characterized in that the separating webs (10, 13) consist of mica.
  6. Single-cap high-pressure discharge lamp according to Claim 1, characterized in that the separating webs (10, 13) are fitted into depressions (12, 14) in the cap wall.
  7. Single-cap high-pressure discharge lamp according to Claim 1, characterized in that the separating webs (10, 13) and the wall of the nose-type recesses (9) form air ducts (17, 18) which permits a flow (G) of cooling gas through the lamp cap (5).
EP93106061A 1992-04-23 1993-04-14 Single-ended high pressure discharge lamp Expired - Lifetime EP0566975B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9205537U DE9205537U1 (en) 1992-04-23 1992-04-23
DE9205537U 1992-04-23

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EP0566975A1 EP0566975A1 (en) 1993-10-27
EP0566975B1 true EP0566975B1 (en) 1996-07-03

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US (1) US5541472A (en)
EP (1) EP0566975B1 (en)
JP (1) JPH0592944U (en)
DE (2) DE9205537U1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9205537U1 (en) * 1992-04-23 1992-06-17 Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh, 8000 Muenchen, De
EP0593117A1 (en) * 1992-10-12 1994-04-20 Koninklijke Philips Electronics N.V. Capped electric lamp
ATE208085T1 (en) * 1997-01-31 2001-11-15 Heraeus Noblelight Gmbh OPTICAL EDITOR
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DE9205537U1 (en) 1992-06-17
EP0566975A1 (en) 1993-10-27
DE59303106D1 (en) 1996-08-08
US5541472A (en) 1996-07-30
JPH0592944U (en) 1993-12-17

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