EP2497103B1 - High pressure discharge lamp - Google Patents

High pressure discharge lamp Download PDF

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Publication number
EP2497103B1
EP2497103B1 EP11701802.8A EP11701802A EP2497103B1 EP 2497103 B1 EP2497103 B1 EP 2497103B1 EP 11701802 A EP11701802 A EP 11701802A EP 2497103 B1 EP2497103 B1 EP 2497103B1
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EP
European Patent Office
Prior art keywords
discharge
pressure
discharge lamp
layer
discharge vessel
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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EP11701802.8A
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German (de)
French (fr)
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EP2497103A1 (en
Inventor
Marc Czichy
Dirk Grundmann
Melanie ZUMKLEY
Detlef Guenther
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Osram GmbH
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Osram GmbH
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Publication of EP2497103A1 publication Critical patent/EP2497103A1/en
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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
    • H01J61/54—Igniting arrangements, e.g. promoting ionisation for starting
    • H01J61/547—Igniting arrangements, e.g. promoting ionisation for starting using an auxiliary electrode outside the vessel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H01J61/34—Double-wall vessels or containers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/82—Lamps with high-pressure unconstricted discharge having a cold pressure > 400 Torr

Definitions

  • the invention is based on a high-pressure discharge lamp according to the preamble of claim 1.
  • document DE 10 2006 007 218 A1 discloses such a high-pressure discharge lamp, which is used for example for a motor vehicle headlight.
  • This has an elongated discharge vessel, which has a discharge chamber approximately in the middle, from which extend diametrically two squeezing.
  • the discharge vessel is covered by a hollow cylindrical outer bulb. This is firmly inserted into a base of the high-pressure discharge lamp together with the discharge vessel.
  • two electrodes arranged opposite one another project from one squeezing end, which serve to generate a gas discharge.
  • a respective electrode is in each case electrically contacted by a power supply which is guided from the front side out of a respective crimping end.
  • the socket remote power supply extends approximately along the outer bulb to the base.
  • the discharge vessel has an electrically conductive coating which serves as a starting aid for lowering an ignition voltage of the high-pressure discharge lamp.
  • a disadvantage of this solution is that despite the coating, the ignition voltage of the high-pressure discharge lamp is still high.
  • the object of the present invention is to provide a high-pressure discharge lamp which has a comparatively low ignition voltage.
  • a high-pressure discharge lamp has a discharge vessel in which a discharge space is formed. To generate a gas discharge, two spaced-apart electrodes extend into the discharge space.
  • the discharge vessel is at least partially surrounded by an outer bulb. In a gas-tight outer space bounded at least by the discharge vessel and the outer bulb, a filling gas is introduced as a starting aid.
  • the discharge vessel has an electrically conductive Zündos Mrs.
  • the high-pressure discharge lamp has two ignition aids for lowering the ignition voltage.
  • the filling gas in the outer space generates at an ignition pulse from an outer side of the discharge vessel, an electrically conductive layer or a plasma, are formed by the discharge space in the ignition assisting dielectrically impeded discharges.
  • photoelectrons are released from the plasma by UV emission, which serve as starting electrons for forming a discharge arc between the electrodes.
  • Another advantage in addition to the low ignition voltage is the high reliability of the high pressure discharge lamp.
  • a non-electrically conductive insulating layer for separating the filling gas and the Zündostik applied to the Zündos slaughter.
  • the insulating layer has the further advantage that it protects the Zündostik against degeneration.
  • the insulating layer is applied in a cold process on the Zündostik and on the discharge vessel.
  • the insulation layer is applied in the cold process with a low-pressure plasma, which in particular contains hexamethyldisiloxane (HMDSO).
  • HMDSO hexamethyldisiloxane
  • the ignition assist layer is simply deposited on an outer surface of the discharge vessel within the outer space.
  • the insulating layer is a translucent glass layer, in particular a quartz glass layer.
  • the insulating layer is applied substantially over the entire surface of the discharge vessel. But it is also possible to apply the insulating layer only on the area in which the Zündostik is arranged to protect the Zündostik against degeneration.
  • the insulating layer can therefore also be provided in high-pressure discharge lamps, in which the filling gas is not used in the outer space between the discharge vessel and outer bulb as a starting aid.
  • the Zündanges Mrs is disposed in the region of the discharge space on the discharge vessel and extends over a portion of the circumference of the discharge space.
  • the discharge vessel has two diametrically extending pinch ends and the Zündanges Mrs is at least partially applied to at least one pinch end.
  • the Zündanges Mrs can thus be adjusted so that the required ignition voltage is minimal.
  • the Zündos Mrs can additionally on at least one Transition region between the discharge space and a respective squeezing be applied in sections or over the entire circumference. So that the filling gas in the outer space can contribute sufficiently to lowering the ignition voltage, this has a lowered compared to the standard atmospheric pressure, which is in particular between 300 mbar to 400 mbar, or in particular between 150 mbar to 200 mbar.
  • the entire discharge vessel is encompassed by the outer bulb and thus surrounded by the outer space.
  • FIG. 1 shows in a side view a schematic representation of a high pressure discharge lamp 1 according to a first embodiment.
  • this is a D4 lamp for a vehicle headlight. This can be mercury-free and has an electrical power consumption of about 35 watts.
  • the high-pressure discharge lamp 1 has a discharge vessel 2 made of quartz glass, which has two approximately diametrically arranged pinch ends 4, 6. Approximately in the middle between the squeezing ends 4, 6, an elongate, approximately circular-cylindrical discharge space 8 is provided in the discharge vessel 2, which extends along a lamp longitudinal axis. In the region of the discharge space 8, the discharge vessel 2 has an approximately ellipsoidal outer contour.
  • the squeezing 4, 6 are elongated and also extend approximately along the lamp longitudinal axis.
  • the discharge space 8 protrude from a respective pinch end 4 and 6 approximately along the lamp axis two spaced-apart electrodes 10 and 12 of tungsten, between which forms a light-emitting discharge arc during operation of the high-pressure discharge lamp 1.
  • the electrodes 10 and 12 are in each case electrically connected to a molybdenum foil 14 or 16 melted into a respective pinch end 4 and 6, respectively.
  • the molybdenum foils 14 and 16 are each electrically connected at one end portion facing away from the electrodes 10 and 12, respectively, to a power supply 18 or 20 introduced in sections into the crimping end 4 and 6, respectively. These are arranged approximately along the lamp longitudinal axis and protrude from the front of the discharge vessel 2.
  • the discharge vessel 2 is at its in the FIG. 1 lower crimping end 6 with a tubular extension 22 in a substantially plastic existing lamp base 24 used.
  • the sockelnahe power supply 20 is guided through the extension 22 in the lamp base 24.
  • the socket remote power supply 18 is connected to a extending approximately along the discharge vessel 2 contact wire 26 which opens into the base 24.
  • the contact wire 26 is additionally partially covered by an approximately tubular insulation element 28 for electrical and thermal insulation.
  • the surface area of the discharge vessel 2 facing the contact wire 26 is provided with a light-transmitting, electrically conductive ignition aid layer 30. This extends approximately in the lamp longitudinal direction over the entire length of the discharge space 8 and about 5 to 50% in the circumferential direction to the discharge vessel 2.
  • the material and the embodiment of the Zündanges Mrs 30 corresponds for example to that in the above-mentioned document DE 10 2006 007 218 A1 ,
  • the discharge vessel 2 is encompassed with its squeezing ends 4, 6 and the discharge space 8 by a glass-made, translucent tubular outer bulb 32. At its sockelfernen end portion of the outer bulb 32 is fused gas-tight with the crimping end 4 by a curl and at its sockelnahem end portion with the extension 22 of the discharge vessel 2 by a constriction. Between the discharge vessel 2 and the outer bulb 32 thus a gas-tight outer space 34 is formed in which, for example, air is introduced.
  • the pressure in the outer space 34 is less than a standard atmospheric pressure of about 1013 mbar and in particular 300 to 400 mbar or preferably 150 to 250 mbar. Under these pressure conditions, the air is in the outer space 34 additionally used as a starting aid in addition to the Zündanges Mrs 30.
  • an insulating layer 36 is applied to the Zündinstik 30 and the discharge vessel 2. This extends approximately over the entire circumferential surface of the discharge vessel 2 arranged within the outer space 34.
  • the insulating layer 36 also protects the auxiliary ignition layer 30 from degeneration.
  • the insulating layer 36 is fabricated in a cold process to avoid damaging the temperature sensitive ignition assist layer 30 by high manufacturing temperatures.
  • the cold process is carried out with the aid of a low-pressure plasma.
  • a substance for example hexamethyldisiloxane (HMDSO)
  • HMDSO hexamethyldisiloxane
  • argon a carrier gas
  • By this method grows within seconds on the discharge vessel 2 firmly adhering and only a few nanometers thick quartz glass layer as the insulating layer 36. This is extremely elastic due to the small thickness and thus insensitive to mechanical stresses.
  • the process takes place at a temperature of less than 100 ° C.
  • the ignition voltage of the high-pressure discharge lamp increases with increasing filling pressure of the introduced in the discharge space 8 filling gas.
  • the Zündostik 30 and the filling gas in the outer space 34 is provided.
  • the high-voltage pulses required to ignite the high-pressure discharge lamp are supplied to the socket-side electrode 12 via the power supply 20, since this is completely enclosed by the discharge vessel 2 together with the extension 22 and the base 24, which ensures excellent electrical insulation of the high-voltage parts of the high-pressure discharge lamp 1 .
  • the said high-voltage pulses are generated, for example, by means of a pulse ignition device, the components of which may be arranged in the lamp base 24.
  • the Zündystik 30 forms a capacitor together with the electrode 12, wherein the intermediate quartz glass of the discharge vessel 2 and the filling gas in the discharge space 8 form a dielectric of this capacitor.
  • a dielectrically impeded discharge (dbE) is generated in the discharge space 8 between the electrode 12 and the auxiliary ignition layer 30.
  • This dbE generated in the discharge space 8 a sufficient number of free charge carriers to allow the electrical breakdown between the two electrodes 10, 12 and to reduce the required ignition voltage significantly.
  • the filling gas in the outer space 34 is also used to lower the ignition voltage, which in the following FIG. 2 is explained in more detail.
  • FIG. 2 is a side view of the high pressure discharge lamp 1 of the FIG. 1 shown when applying an ignition voltage.
  • This is a positive ignition pulse at the in the FIG. 2 lower electrode 12 applied.
  • the filling gas forms in the outer space 34 between the outer bulb 32 and the discharge vessel 2 by the ignition pulse to an electrically conductive layer or a plasma 37 at a peripheral portion of the discharge vessel 2.
  • the plasma 37 extends in this case around the discharge vessel 2 asymmetrically in the region of the discharge space 8 and in the FIG. 2 lower squeezing 6 and is shown in dashed lines.
  • the plasma 37 has the same effect as the Zündcous Mrs 30 and thus forms together with the lower electrode 12 in the FIG. 2 a capacitor.
  • a disadvantage of the plasma 37 in the outer space 34 is that it can only occur under a lower pressure compared to the standard atmospheric pressure. Equals the pressure in the outer space 34, for example due to cracks occurring in the production in the outer bulb 32 to the external pressure, then no plasma 37 is formed when an ignition voltage to the high-pressure discharge lamp 1. However, since the high-pressure discharge lamp 1 additionally has the ignition aid layer 30 as a starting aid, the ignition voltage is lowered even in the case of a non-forming plasma 37, which ensures high reliability of the high-pressure discharge lamp 1.
  • the insulating layer 36 acts in this case only as a protective layer, which protects the Zündanges Mrs 30 against degeneration.
  • FIG. 3 represents the high-pressure discharge lamp 1 in a side view FIG. 1 in which an ignition voltage with a negative ignition pulse to the base near the electrode, the electrode 12 in FIG. 2 corresponds, is created.
  • the plasma 37 forms in contrast to FIG. 2 on the outer circumference of the upper crimp end 4 of the discharge vessel 2.
  • the electrically conductive plasma 37 thus provides, together with the Zündos Mrs 30 an asymmetric ignition aid available.
  • FIG. 4 is shown in a side view, the high-pressure discharge lamp 1 according to a second embodiment.
  • FIG. 1 is the Zündcous Mrs 30 designed differently. This has here an upper and lower legs 38 and 40, each along a squeezing 4 or 6 extend. The legs 38 and 40 are arranged approximately in the region between the molybdenum foils 14 and 16 and extending along the discharge vessel 2 contact wire 26 in the lamp longitudinal direction on the squeezing 4 and 6 and surround these sections in the circumferential direction.
  • the Zündyll 30 is on a surface of a transition region 42 and 44 between a respective crimp end 4 and 6 and the discharge space 8 comprising the central region of the discharge vessel 2.
  • the transition regions 42 and 44 are annular groove-like, with the Zündos Mrs 30 then over the entire circumference of the transition regions 42, 44 extends.
  • the Zündos Mrs according to the second embodiment of the invention thus has a arranged in the discharge space layer portion 30, two arranged in the ringnutartigen transition areas layer sections 42, 44 and two arranged on the pinch ends 4, 6 layer sections 38, 40.
  • the aforementioned layer sections form a coherent Zündos slaughter ,
  • the in the FIG. 1 formed Zündcous slaughter 30 has a smaller area compared to the layer portion 30 of the Zündos slaughter from the FIG. 4 on. As a result, a larger-area distribution of the plasma 37 around the outer circumference of the discharge vessel 2 is made possible.
  • the invention is not limited to the embodiments of the invention described in detail above.
  • the sockel-off squeezing 4 layer portion 38 or the Layer layer 40 of the ignition assist layer arranged on the base near pinch 6 can be dispensed with, as a result of which an asymmetrically formed auxiliary ignition layer is achieved.

Description

Technisches GebietTechnical area

Die Erfindung geht aus von einer Hochdruckentladungslampe gemäß dem Oberbegriff des Anspruchs 1.The invention is based on a high-pressure discharge lamp according to the preamble of claim 1.

Stand der TechnikState of the art

Dokument DE 10 2006 007 218 A1 offenbart eine derartige Hochdruckentladungslampe, die beispielsweise für einen Kraftfahrzeugscheinwerfer eingesetzt wird. Diese hat ein längliches Entladungsgefäß, das etwa mittig einen Entladungsraum aufweist von dem aus sich diametral zwei Quetschenden erstrecken. Das Entladungsgefäß ist von einem hohlzylindrischen Außenkolben umfasst. Dieser ist zusammen mit dem Entladungsgefäß fest in einen Sockel der Hochdruckentladungslampe eingesetzt. In den Entladungsraum kragen jeweils von einem Quetschende her zwei zueinander gegenüber liegend angeordnete Elektroden aus, die zur Erzeugung einer Gasentladung dienen. Eine jeweilige Elektrode ist jeweils von einer stirnseitig aus einem jeweiligen Quetschende heraus geführten Stromzuführung elektrisch kontaktiert. Die sockelferne Stromzuführung erstreckt sich dabei etwa entlang des Außenkolbens zum Sockel. Das Entladungsgefäß weist eine elektrisch leitfähige Beschichtung auf, die als Zündhilfe zur Senkung einer Zündspannung der Hochdruckentladungslampe dient.document DE 10 2006 007 218 A1 discloses such a high-pressure discharge lamp, which is used for example for a motor vehicle headlight. This has an elongated discharge vessel, which has a discharge chamber approximately in the middle, from which extend diametrically two squeezing. The discharge vessel is covered by a hollow cylindrical outer bulb. This is firmly inserted into a base of the high-pressure discharge lamp together with the discharge vessel. In the discharge space, in each case two electrodes arranged opposite one another project from one squeezing end, which serve to generate a gas discharge. A respective electrode is in each case electrically contacted by a power supply which is guided from the front side out of a respective crimping end. The socket remote power supply extends approximately along the outer bulb to the base. The discharge vessel has an electrically conductive coating which serves as a starting aid for lowering an ignition voltage of the high-pressure discharge lamp.

Auch das Dokument WO 2008/007283 A2 offenbart eine Lampe gemäß dem Oberbegriff des Anspruchs 1.Also the document WO 2008/007283 A2 discloses a lamp according to the preamble of claim 1.

Nachteilig bei dieser Lösung ist, dass trotz der Beschichtung die Zündspannung der Hochdruckentladungslampe weiterhin hoch ist.A disadvantage of this solution is that despite the coating, the ignition voltage of the high-pressure discharge lamp is still high.

Darstellung der ErfindungPresentation of the invention

Die Aufgabe der vorliegenden Erfindung ist es, eine Hochdruckentladungslampe zu schaffen, die eine vergleichsweise geringe Zündspannung aufweist.The object of the present invention is to provide a high-pressure discharge lamp which has a comparatively low ignition voltage.

Diese Aufgabe wird gelöst durch eine Hochdruckentladungslampe mit den Merkmalen des Anspruchs 1.This object is achieved by a high-pressure discharge lamp having the features of claim 1.

Erfindungsgemäß hat eine Hochdruckentladungslampe ein Entladungsgefäß, in dem ein Entladungsraum ausgebildet ist. Zur Erzeugung einer Gasentladung erstrecken sich zwei zueinander beabstandete Elektroden in den Entladungsraum. Das Entladungsgefäß ist zumindest abschnittsweise von einem Außenkolben umgriffen. In einem wenigstens von dem Entladungsgefäß und dem Außenkolben begrenzten, gasdichten Außenraum ist ein Füllgas als Zündhilfe eingebracht. Zusätzlich weist das Entladungsgefäß eine elektrisch leitfähige Zündhilfsschicht auf.According to the invention, a high-pressure discharge lamp has a discharge vessel in which a discharge space is formed. To generate a gas discharge, two spaced-apart electrodes extend into the discharge space. The discharge vessel is at least partially surrounded by an outer bulb. In a gas-tight outer space bounded at least by the discharge vessel and the outer bulb, a filling gas is introduced as a starting aid. In addition, the discharge vessel has an electrically conductive Zündhilfsschicht.

Diese Lösung hat den Vorteil, dass die Hochdruckentladungslampe zwei Zündhilfen zum Senken der Zündspannung aufweist. Das Füllgas im Außenraum erzeugt bei einem Zündimpuls von einer Außenseite des Entladungsgefäßes eine elektrisch leitfähige Schicht bzw. ein Plasma, durch die im Entladungsraum eine Zündung unterstützende dielektrisch behinderte Entladungen gebildet werden. Zusätzlich werden von dem Plasma durch UV-Emission Photoelektronen freigesetzt, die als Startelektronen für das Ausbilden eines Entladungsbogens zwischen den Elektroden dienen. Ein weiterer Vorteil neben der geringen Zündspannung ist die hohe Betriebssicherheit der Hochdruckentladungslampe. Bilden sich beispielsweise bei einer Herstellung der Hochdruckentladungslampe Risse im Außenkolben, was eine Veränderung eines Drucks und einer Gaszusammensetzung des Füllgases zur Folge haben kann, so ist die Funktion des Füllgases als Zündhilfe nicht mehr möglich, da allerdings zusätzlich die Zündhilfsschicht angeordnet ist, wird die Zündspannung weiterhin ausreichend gesenkt.This solution has the advantage that the high-pressure discharge lamp has two ignition aids for lowering the ignition voltage. The filling gas in the outer space generates at an ignition pulse from an outer side of the discharge vessel, an electrically conductive layer or a plasma, are formed by the discharge space in the ignition assisting dielectrically impeded discharges. In addition, photoelectrons are released from the plasma by UV emission, which serve as starting electrons for forming a discharge arc between the electrodes. Another advantage in addition to the low ignition voltage is the high reliability of the high pressure discharge lamp. For example, during production of the high-pressure discharge lamp, cracks develop in the outer bulb, which may result in a change of a pressure and a gas composition of the filling gas, the function of the filling gas is no longer possible as a starting aid, but since the Zündhilfsschicht is additionally arranged, the ignition voltage is further reduced sufficiently.

Zur Verhinderung eines Kurzschlusses zwischen dem Füllgas im Außenraum und der Zündhilfsschicht bei einem Zünden der Hochdruckentladungslampe ist, erfindungsgemäß, eine nicht elektrisch leitfähige Isolationsschicht zum Trennen des Füllgases und der Zündhilfsschicht auf die Zündhilfsschicht aufgebracht. Die Isolationsschicht hat den weiteren Vorteil, dass sie die Zündhilfsschicht vor Degeneration schützt.In order to prevent a short circuit between the filling gas in the outer space and the Zündhilfsschicht upon ignition of the high-pressure discharge lamp, according to the invention, a non-electrically conductive insulating layer for separating the filling gas and the Zündhilfsschicht applied to the Zündhilfsschicht. The insulating layer has the further advantage that it protects the Zündhilfsschicht against degeneration.

Um zu vermeiden, dass die Zündhilfsschicht aufgrund hoher Temperaturen beschädigt wird, wird, erfindungsgemäß, die Isolationsschicht in einem kalten Verfahren auf die Zündhilfsschicht und auf das Entladungsgefäß aufgebracht.In order to avoid that the Zündhilfsschicht is damaged due to high temperatures, according to the invention, the insulating layer is applied in a cold process on the Zündhilfsschicht and on the discharge vessel.

Erfindungsgemäß wird die Isolationsschicht im kalten Verfahren mit einem Niederdruckplasma aufgebracht, wobei dieses insbesondere Hexamethyldisiloxan (HMDSO) enthält. Mit diesem Verfahren kann kostengünstig eine äußerst dünne und somit elastische Isolationsschicht auf das Entladungsgefäß und die Zündhilfsschicht aufgebracht werden.According to the invention, the insulation layer is applied in the cold process with a low-pressure plasma, which in particular contains hexamethyldisiloxane (HMDSO). With this method, an extremely thin and therefore elastic insulating layer can be applied to the discharge vessel and the ignition aid layer at low cost.

Besonders vorteilhafte Ausgestaltungen finden sich in den abhängigen Ansprüchen.Particularly advantageous embodiments can be found in the dependent claims.

Vorzugsweise ist die Zündhilfsschicht einfach auf einer äußeren Oberfläche des Entladungsgefäßes innerhalb des Außenraums aufgebracht.Preferably, the ignition assist layer is simply deposited on an outer surface of the discharge vessel within the outer space.

Mit Vorteil ist die Isolationsschicht eine lichtdurchlässige Glasschicht, insbesondere eine Quarzglasschicht.Advantageously, the insulating layer is a translucent glass layer, in particular a quartz glass layer.

Um eine sichere Isolation zu gewährleisten ist die Isolationsschicht im Wesentlichen über die gesamte Oberfläche des Entladungsgefäßes aufgebracht. Es ist aber auch möglich, die Isolationsschicht nur auf dem Bereich aufzubringen, in dem die Zündhilfsschicht angeordnet ist, um die Zündhilfsschicht vor Degeneration zu schützen. Die Isolationsschicht kann daher auch bei Hochdruckentladungslampen vorgesehen sein, bei denen das Füllgas im Außenraum zwischen Entladungsgefäß und Außenkolben nicht als Zündhilfe genutzt wird.In order to ensure reliable insulation, the insulating layer is applied substantially over the entire surface of the discharge vessel. But it is also possible to apply the insulating layer only on the area in which the Zündhilfsschicht is arranged to protect the Zündhilfsschicht against degeneration. The insulating layer can therefore also be provided in high-pressure discharge lamps, in which the filling gas is not used in the outer space between the discharge vessel and outer bulb as a starting aid.

Bevorzugter Weise ist die Zündhilfsschicht im Bereich des Entladungsraums auf dem Entladungsgefäß angeordnet und erstreckt sich über einen Abschnitt des Umfangs des Entladungsraums.Preferably, the Zündhilfsschicht is disposed in the region of the discharge space on the discharge vessel and extends over a portion of the circumference of the discharge space.

In weiterer Ausgestaltung der Erfindung hat das Entladungsgefäß zwei sich diametral erstreckende Quetschenden und die Zündhilfsschicht ist zumindest Abschnittsweise auf wenigstens ein Quetschende aufgebracht. Die Zündhilfsschicht kann somit derart angepasst werden, dass die benötigte Zündspannung minimal ist.In a further embodiment of the invention, the discharge vessel has two diametrically extending pinch ends and the Zündhilfsschicht is at least partially applied to at least one pinch end. The Zündhilfsschicht can thus be adjusted so that the required ignition voltage is minimal.

Die Zündhilfsschicht kann zusätzlich auf wenigstens einen Übergangsbereich zwischen dem Entladungsraum und einem jeweiligen Quetschende abschnittsweise oder über dessen Gesamtumfang aufgebracht sein. Damit das Füllgas im Außenraum ausreichend zur Senkung der Zündspannung beitragen kann, hat dieses einen im Vergleich zum Standardatmosphärendruck abgesenkten Druck, der insbesondere zwischen 300 mbar bis 400 mbar, oder insbesondere zwischen 150 mbar bis 200 mbar liegt.The Zündhilfsschicht can additionally on at least one Transition region between the discharge space and a respective squeezing be applied in sections or over the entire circumference. So that the filling gas in the outer space can contribute sufficiently to lowering the ignition voltage, this has a lowered compared to the standard atmospheric pressure, which is in particular between 300 mbar to 400 mbar, or in particular between 150 mbar to 200 mbar.

Als besonders kostengünstig kann als Füllgas Luft eingesetzt werden.As a particularly cost can be used as a filling gas air.

Damit sich eine möglichst großflächige Schicht bzw. Plasma durch das Füllgas auf dem Entladungsgefäß beim Zünden der Hochdruckentladungslampe bilden kann, ist das gesamte Entladungsgefäß von dem Außenkolben umgriffen und somit vom Außenraum umgeben.In order that the largest possible layer or plasma can form on the discharge vessel when the high-pressure discharge lamp is ignited by the filling gas, the entire discharge vessel is encompassed by the outer bulb and thus surrounded by the outer space.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Im Folgenden soll die Erfindung anhand von Ausführungsbeispielen näher erläutert werden. Die Figuren zeigen:

Fig. 1
in einer Seitenansicht eine erfindungsgemäße Hochdruckentladungslampe gemäß einem ersten Ausführungsbeispiel
Fig. 2
in einer Seitenansicht die Hochdruckentladungslampe aus Figur 1 bei einer Zündung
Fig. 3
in einer Seitenansicht die Hochdruckentladungslampe aus Figur 1 bei der Zündung
Fig. 4
in einer Seitenansicht die erfindungsgemäße Hochdruckentladungslampe gemäß einem zweiten Ausführungsbeispiel
In the following, the invention will be explained in more detail with reference to exemplary embodiments. The figures show:
Fig. 1
in a side view of a high-pressure discharge lamp according to the invention according to a first embodiment
Fig. 2
in a side view, the high pressure discharge lamp FIG. 1 at an ignition
Fig. 3
in a side view, the high pressure discharge lamp FIG. 1 at the ignition
Fig. 4
in a side view, the high-pressure discharge lamp according to the invention according to a second embodiment

Bevorzugte Ausführung der ErfindungPreferred embodiment of the invention

Figur 1 zeigt in einer Seitenansicht eine schematische Darstellung einer Hochdruckentladungslampe 1 gemäß einem ersten Ausführungsbeispiel. Hier handelt es sich beispielsweise um eine D4-Lampe für einen Fahrzeugscheinwerfer. Diese kann quecksilberfrei sein und weist eine elektrische Leistungsaufnahme von ungefähr 35 Watt auf. FIG. 1 shows in a side view a schematic representation of a high pressure discharge lamp 1 according to a first embodiment. For example, this is a D4 lamp for a vehicle headlight. This can be mercury-free and has an electrical power consumption of about 35 watts.

Die Hochdruckentladungslampe 1 hat ein Entladungsgefäß 2 aus Quarzglas, das zwei etwa diametral angeordnete Quetschenden 4, 6 aufweist. Etwa mittig zwischen den Quetschenden 4, 6 ist in dem Entladungsgefäß 2 ein sich entlang einer Lampenlängsachse erstreckender länglicher, etwa kreiszylindrischer Entladungsraum 8 eingebracht. Im Bereich des Entladungsraums 8 weist das Entladungsgefäß 2 eine etwa ellipsoidförmige Außenkontur auf. Die Quetschenden 4, 6 sind länglich ausgebildet und erstrecken sich ebenfalls etwa entlang der Lampenlängsachse.The high-pressure discharge lamp 1 has a discharge vessel 2 made of quartz glass, which has two approximately diametrically arranged pinch ends 4, 6. Approximately in the middle between the squeezing ends 4, 6, an elongate, approximately circular-cylindrical discharge space 8 is provided in the discharge vessel 2, which extends along a lamp longitudinal axis. In the region of the discharge space 8, the discharge vessel 2 has an approximately ellipsoidal outer contour. The squeezing 4, 6 are elongated and also extend approximately along the lamp longitudinal axis.

In den Entladungsraum 8 ragen von einem jeweiligen Quetschende 4 bzw. 6 etwa entlang der Lampenlängsachse zwei zueinander beabstandete Elektroden 10 bzw. 12 aus Wolfram hinein, zwischen denen sich während des Betriebes der Hochdruckentladungslampe 1 ein lichtemittierender Entladungsbogen ausbildet. Die Elektroden 10 und 12 sind jeweils mit einer in ein jeweiliges Quetschende 4 bzw. 6 eingeschmolzenen Molybdänfolie 14 bzw. 16 elektrisch verbunden. Die Molybdänfolien 14 und 16 wiederum sind jeweils an einem von den Elektroden 10 bzw. 12 wegweisenden Endabschnitt mit einer abschnittsweise in das Quetschende 4 bzw. 6 eingebrachten Stromzuführung 18 bzw. 20 elektrisch verbunden. Diese sind dabei etwa entlang der Lampenlängsachse angeordnet und ragen jeweils stirnseitig aus dem Entladungsgefäß 2 heraus.In the discharge space 8 protrude from a respective pinch end 4 and 6 approximately along the lamp axis two spaced-apart electrodes 10 and 12 of tungsten, between which forms a light-emitting discharge arc during operation of the high-pressure discharge lamp 1. The electrodes 10 and 12 are in each case electrically connected to a molybdenum foil 14 or 16 melted into a respective pinch end 4 and 6, respectively. The molybdenum foils 14 and 16, in turn, are each electrically connected at one end portion facing away from the electrodes 10 and 12, respectively, to a power supply 18 or 20 introduced in sections into the crimping end 4 and 6, respectively. These are arranged approximately along the lamp longitudinal axis and protrude from the front of the discharge vessel 2.

Das Entladungsgefäß 2 ist an seinem in der Figur 1 unteren Quetschende 6 mit einer rohrförmigen Verlängerung 22 in einen im Wesentlichen aus Kunststoff bestehenden Lampensockel 24 eingesetzt. Die sockelnahe Stromzuführung 20 ist durch die Verlängerung 22 in den Lampensockel 24 geführt. Die sockelferne Stromzuführung 18 ist mit einem sich etwa entlang des Entladungsgefäßes 2 erstreckenden Kontaktdraht 26 verbunden, der in dem Sockel 24 mündet. Der Kontaktdraht 26 ist abschnittsweise zusätzlich von einem etwa rohrförmigen Isolationselement 28 zur elektrischen und thermischen Isolierung umfasst.The discharge vessel 2 is at its in the FIG. 1 lower crimping end 6 with a tubular extension 22 in a substantially plastic existing lamp base 24 used. The sockelnahe power supply 20 is guided through the extension 22 in the lamp base 24. The socket remote power supply 18 is connected to a extending approximately along the discharge vessel 2 contact wire 26 which opens into the base 24. The contact wire 26 is additionally partially covered by an approximately tubular insulation element 28 for electrical and thermal insulation.

Der dem Kontaktdraht 26 zugewandte Oberflächenbereich des Entladungsgefäßes 2 ist mit einer lichtdurchlässigen, elektrisch leitfähigen Zündhilfsschicht 30 versehen. Diese erstreckt sich in etwa Lampenlängsrichtung über die gesamte Länge des Entladungsraums 8 und etwa 5 bis 50 % in Umfangsrichtung um das Entladungsgefäß 2. Das Material und die Ausgestaltung der Zündhilfsschicht 30 entspricht beispielsweise der in dem eingangs erläuterten Dokument DE 10 2006 007 218 A1 .The surface area of the discharge vessel 2 facing the contact wire 26 is provided with a light-transmitting, electrically conductive ignition aid layer 30. This extends approximately in the lamp longitudinal direction over the entire length of the discharge space 8 and about 5 to 50% in the circumferential direction to the discharge vessel 2. The material and the embodiment of the Zündhilfsschicht 30 corresponds for example to that in the above-mentioned document DE 10 2006 007 218 A1 ,

Das Entladungsgefäß 2 ist mit seinen Quetschenden 4, 6 und dem Entladungsraum 8 von einem aus Glas bestehenden, lichtdurchlässigen rohrförmigen Außenkolben 32 umgriffen. An seinem sockelfernen Endabschnitt ist der Außenkolben 32 mit dem Quetschende 4 durch eine Anrollung und an seinem sockelnahem Endabschnitt mit der Verlängerung 22 des Entladungsgefäßes 2 durch eine Einschnürung gasdicht verschmolzen. Zwischen dem Entladungsgefäß 2 und dem Außenkolben 32 ist somit ein gasdichter Außenraum 34 gebildet, in dem beispielsweise Luft eingebracht ist. Der Druck im Außenraum 34 ist dabei geringer als ein Standardatmosphärendruck mit etwa 1013 mbar ist und insbesondere 300 bis 400 mbar oder vorzugsweise 150 bis 250 mbar beträgt. Unter diesen Druckverhältnissen ist die Luft im Außenraum 34 zusätzlich als Zündhilfe neben der Zündhilfsschicht 30 eingesetzt.The discharge vessel 2 is encompassed with its squeezing ends 4, 6 and the discharge space 8 by a glass-made, translucent tubular outer bulb 32. At its sockelfernen end portion of the outer bulb 32 is fused gas-tight with the crimping end 4 by a curl and at its sockelnahem end portion with the extension 22 of the discharge vessel 2 by a constriction. Between the discharge vessel 2 and the outer bulb 32 thus a gas-tight outer space 34 is formed in which, for example, air is introduced. The pressure in the outer space 34 is less than a standard atmospheric pressure of about 1013 mbar and in particular 300 to 400 mbar or preferably 150 to 250 mbar. Under these pressure conditions, the air is in the outer space 34 additionally used as a starting aid in addition to the Zündhilfsschicht 30.

Zur Vermeidung eines Kurzschlusses zwischen der Zündhilfsschicht 30 und der Luft im Außenraum 34 beim Zünden der Hochdruckentladungslampe 1 ist auf die Zündhilfsschicht 30 und auf das Entladungsgefäß 2 eine Isolationsschicht 36 aufgebracht. Diese erstreckt sich etwa über die gesamte innerhalb des Außenraums 34 angeordnete Umfangsfläche des Entladungsgefäßes 2. Die Isolationsschicht 36 schützt ferner die Zündhilfsschicht 30 vor Degeneration.To avoid a short circuit between the Zündhilfsschicht 30 and the air in the outer space 34 when igniting the high pressure discharge lamp 1, an insulating layer 36 is applied to the Zündhilfsschicht 30 and the discharge vessel 2. This extends approximately over the entire circumferential surface of the discharge vessel 2 arranged within the outer space 34. The insulating layer 36 also protects the auxiliary ignition layer 30 from degeneration.

Die Isolationsschicht 36 wird in einem kalten Verfahren hergestellt, um zu vermeiden, dass die temperaturempfindliche Zündhilfsschicht 30 durch hohe Temperaturen bei der Herstellung beschädigt wird. Das kalte Verfahren erfolgt mit Hilfe eines Niederdruckplasmas. Hierbei wird auf das Entladungsgefäß 2 in einer Vakuumkammer ein Stoff, beispielsweise Hexamethyldisiloxan (HMDSO), über ein Trägergas, beispielsweise Argon, eingebracht, wobei der Stoff dann über Mikrowellen angeregt wird. Durch dieses Verfahren wächst innerhalb von Sekunden eine auf dem Entladungsgefäß 2 fest anhaftende und nur wenige Nanometer dicke Quarzglasschicht als Isolationsschicht 36. Diese ist durch die geringe Dicke äußerst elastisch und somit unempfindlich gegenüber mechanischen Spannungen. Das Verfahren läuft bei einer Temperatur von kleiner 100°C ab.The insulating layer 36 is fabricated in a cold process to avoid damaging the temperature sensitive ignition assist layer 30 by high manufacturing temperatures. The cold process is carried out with the aid of a low-pressure plasma. In this case, a substance, for example hexamethyldisiloxane (HMDSO), via a carrier gas, for example argon, introduced onto the discharge vessel 2 in a vacuum chamber, wherein the material is then excited via microwaves. By this method grows within seconds on the discharge vessel 2 firmly adhering and only a few nanometers thick quartz glass layer as the insulating layer 36. This is extremely elastic due to the small thickness and thus insensitive to mechanical stresses. The process takes place at a temperature of less than 100 ° C.

Die Zündspannung der Hochdruckentladungslampe nimmt mit zunehmendem Fülldruck des in dem Entladungsraum 8 eingebrachten Füllgases zu. Eine D3- oder D4-Lampe eines Fahrzeugscheinwerfers mit beispielsweise einem in dem Entladungsraum 8 eingebrachten Füllgas aus Xenon, das einen Kaltfülldruck von 16 bar aufweist, erfordert eine Zündspannung von etwa 25 kV. Um die Zündspannung zu senken, ist die Zündhilfsschicht 30 und das Füllgas im Außenraum 34 vorgesehen.The ignition voltage of the high-pressure discharge lamp increases with increasing filling pressure of the introduced in the discharge space 8 filling gas. A D3 or D4 lamp of a vehicle headlamp with, for example, one in the discharge space 8 introduced filling gas from xenon, which has a cold filling pressure of 16 bar, requires an ignition voltage of about 25 kV. In order to lower the ignition voltage, the Zündhilfsschicht 30 and the filling gas in the outer space 34 is provided.

Die zum Zünden der Hochdruckentladungslampe erforderlichen Hochspannungsimpulse werden der sockelseitigen Elektrode 12 über die Stromzuführung 20 zugeführt, da diese vollständig von dem Entladungsgefäß 2 zusammen mit der Verlängerung 22 und dem Sockel 24 umfasst ist, was eine ausgezeichnete elektrische Isolation der Hochspannung führenden Teile der Hochdruckentladungslampe 1 gewährleistet. Die genannten Hochspannungsimpulse werden beispielsweise mittels einer Impulszündvorrichtung generiert, deren Komponenten im Lampensockel 24 angeordnet sein können. Bei einer Zündung der Hochdruckentladungslampe 1 bildet die Zündhilfsschicht 30 zusammen mit der Elektrode 12 einen Kondensator, wobei das dazwischen liegende Quarzglas des Entladungsgefäßes 2 und das Füllgas im Entladungsraum 8 ein Dielektrikum dieses Kondensators bilden. Dadurch wird, insbesondere mittels der hochfrequenten Anteile des Zündimpulses, im Entladungsraum 8 eine dielektrisch behinderte Entladung (dbE) zwischen der Elektrode 12 und der Zündhilfsschicht 30 generiert. Diese dbE erzeugt im Entladungsraum 8 eine ausreichende Anzahl von freien Ladungsträgern, um den elektrischen Durchbruch zwischen den beiden Elektroden 10, 12 zu ermöglichen bzw. die dafür erforderliche Zündspannung deutlich zu reduzieren. Neben der Zündhilfsschicht 30 dient das Füllgas in dem Außenraum 34 ebenfalls zum Senken der Zündspannung, was in der folgenden Figur 2 näher erläutert ist.The high-voltage pulses required to ignite the high-pressure discharge lamp are supplied to the socket-side electrode 12 via the power supply 20, since this is completely enclosed by the discharge vessel 2 together with the extension 22 and the base 24, which ensures excellent electrical insulation of the high-voltage parts of the high-pressure discharge lamp 1 , The said high-voltage pulses are generated, for example, by means of a pulse ignition device, the components of which may be arranged in the lamp base 24. Upon ignition of the high-pressure discharge lamp 1, the Zündhilfsschicht 30 forms a capacitor together with the electrode 12, wherein the intermediate quartz glass of the discharge vessel 2 and the filling gas in the discharge space 8 form a dielectric of this capacitor. As a result, in particular by means of the high-frequency components of the ignition pulse, a dielectrically impeded discharge (dbE) is generated in the discharge space 8 between the electrode 12 and the auxiliary ignition layer 30. This dbE generated in the discharge space 8 a sufficient number of free charge carriers to allow the electrical breakdown between the two electrodes 10, 12 and to reduce the required ignition voltage significantly. In addition to the Zündhilfsschicht 30, the filling gas in the outer space 34 is also used to lower the ignition voltage, which in the following FIG. 2 is explained in more detail.

In der Figur 2 ist in einer Seitenansicht die Hochdruckentladungslampe 1 aus der Figur 1 beim Anlegen einer Zündspannung gezeigt. Hierbei wird ein positiver Zündimpuls an der in der Figur 2 unteren Elektrode 12 angelegt. Das Füllgas bildet im Außenraum 34 zwischen dem Außenkolben 32 und dem Entladungsgefäß 2 durch den Zündimpuls zu einer elektrisch leitfähige Schicht bzw. ein Plasma 37 an einem Umfangsabschnitt des Entladungsgefäßes 2 aus. Das Plasma 37 erstreckt sich hierbei um das Entladungsgefäß 2 asymmetrisch im Bereich des Entladungsraums 8 und dem in der Figur 2 unteren Quetschende 6 und ist gestrichelt dargestellt. Das Plasma 37 hat den gleichen Effekt wie die Zündhilfsschicht 30 und bildet somit zusammen mit der unteren Elektrode 12 in der Figur 2 einen Kondensator. Des Weiteren werden von dem Plasma 37 Photoelektronen aufgrund einer UV-Emission gebildet, die als Startelektronen für den Entladungsbogen zwischen den Elektroden 10, 12 dienen. Durch die Zündhilfsschicht 30 und das Plasma 37 in dem Außenraum 34 kann die Zündspannung der Hochdruckentladungslampe 1 somit stark gesenkt werden.In the FIG. 2 is a side view of the high pressure discharge lamp 1 of the FIG. 1 shown when applying an ignition voltage. This is a positive ignition pulse at the in the FIG. 2 lower electrode 12 applied. The filling gas forms in the outer space 34 between the outer bulb 32 and the discharge vessel 2 by the ignition pulse to an electrically conductive layer or a plasma 37 at a peripheral portion of the discharge vessel 2. The plasma 37 extends in this case around the discharge vessel 2 asymmetrically in the region of the discharge space 8 and in the FIG. 2 lower squeezing 6 and is shown in dashed lines. The plasma 37 has the same effect as the Zündhilfsschicht 30 and thus forms together with the lower electrode 12 in the FIG. 2 a capacitor. Furthermore, 37 photoelectrons are formed by the plasma due to a UV emission, which serve as starting electrons for the discharge arc between the electrodes 10, 12. By the Zündhilfsschicht 30 and the plasma 37 in the outer space 34, the ignition voltage of the high pressure discharge lamp 1 can thus be greatly reduced.

Bei Versuchen hat sich herausgestellt, dass eine asymmetrisch zum Entladungsgefäß 2 angeordnete Zündhilfsschicht 30 zur weiteren Absenkung der notwendigen Zündspannung im Vergleich zu einer symmetrisch angeordneten Zündhilfsschicht 30 führt, was beispielsweise in dem eingangs erläuterten Stand der Technik aufgezeigt ist. Ein sich asymmetrisch im Außenraum 34 ausbreitendes Plasma 37 weist einen gleichen Effekt auf.In experiments it has been found that an asymmetrically arranged to the discharge vessel 2 Zündhilfsschicht 30 leads to further lowering of the necessary ignition voltage compared to a symmetrically arranged Zündhilfsschicht 30, which is shown for example in the above-described prior art. A plasma 37 spreading asymmetrically in the outer space 34 has the same effect.

Nachteilig bei dem Plasma 37 in dem Außenraum 34 ist, dass es nur unter einem niedrigeren Druck im Vergleich zum Standardatmosphärendruck entstehen kann. Gleicht sich der Druck im Außenraum 34 beispielsweise durch in der Herstellung auftretende Risse im Außenkolben 32 dem Außendruck an, dann wird beim Anlegen einer Zündspannung an die Hochdruckentladungslampe 1 kein Plasma 37 mehr gebildet. Da allerdings die Hochdruckentladungslampe 1 zusätzlich als Zündhilfe die Zündhilfsschicht 30 aufweist, wird selbst bei einem sich nicht ausbildenden Plasma 37 die Zündspannung gesenkt, was eine hohe Betriebssicherheit der Hochdruckentladungslampe 1 gewährleistet. Die Isolationsschicht 36 wirkt in diesem Fall nur als Schutzschicht, welche die Zündhilfsschicht 30 vor Degeneration schützt.A disadvantage of the plasma 37 in the outer space 34 is that it can only occur under a lower pressure compared to the standard atmospheric pressure. Equals the pressure in the outer space 34, for example due to cracks occurring in the production in the outer bulb 32 to the external pressure, then no plasma 37 is formed when an ignition voltage to the high-pressure discharge lamp 1. However, since the high-pressure discharge lamp 1 additionally has the ignition aid layer 30 as a starting aid, the ignition voltage is lowered even in the case of a non-forming plasma 37, which ensures high reliability of the high-pressure discharge lamp 1. The insulating layer 36 acts in this case only as a protective layer, which protects the Zündhilfsschicht 30 against degeneration.

Figur 3 stellt in einer Seitenansicht die Hochdruckentladungslampe 1 aus Figur 1 dar, bei der eine Zündspannung mit einem negativen Zündimpuls an die sockelnahe Elektrode, die der Elektrode 12 in Figur 2 entspricht, angelegt ist. Hierbei bildet sich das Plasma 37 im Gegensatz zur Figur 2 am Außenumfang des oberen Quetschendes 4 des Entladungsgefäßes 2 aus. Das elektrisch leitfähige Plasma 37 stellt somit zusammen mit der Zündhilfsschicht 30 eine asymmetrische Zündhilfe zur Verfügung. FIG. 3 represents the high-pressure discharge lamp 1 in a side view FIG. 1 in which an ignition voltage with a negative ignition pulse to the base near the electrode, the electrode 12 in FIG. 2 corresponds, is created. Here, the plasma 37 forms in contrast to FIG. 2 on the outer circumference of the upper crimp end 4 of the discharge vessel 2. The electrically conductive plasma 37 thus provides, together with the Zündhilfsschicht 30 an asymmetric ignition aid available.

Im Vergleich der Figur 2 mit der Figur 3 ist erkennbar, dass sich das Plasma 37 in Abhängigkeit des Zündimpulses um das Entladungsgefäß 2 verteilt.In comparison of the FIG. 2 with the FIG. 3 It can be seen that the plasma 37 is distributed around the discharge vessel 2 as a function of the ignition pulse.

In der Figur 4 ist in einer Seitenansicht die Hochdruckentladungslampe 1 gemäß einem zweiten Ausführungsbeispiel gezeigt. Im Unterschied zum ersten Ausführungsbeispiel aus Figur 1 ist die Zündhilfsschicht 30 anders ausgestaltet. Diese hat hier einen oberen und unteren Schenkel 38 und 40, die sich jeweils entlang eines Quetschendes 4 bzw. 6 erstrecken. Die Schenkel 38 und 40 sind dabei etwa im Bereich zwischen den Molybdänfolien 14 bzw. 16 und dem sich entlang des Entladungsgefäßes 2 erstreckenden Kontaktdraht 26 in Lampenlängsrichtung auf den Quetschenden 4 bzw. 6 angeordnet und umgreifen diese abschnittsweise in Umfangsrichtung. Des Weiteren ist die Zündhilfsschicht 30 auf eine Oberfläche eines Übergangsbereichs 42 und 44 zwischen einem jeweiligen Quetschende 4 bzw. 6 und dem den Entladungsraum 8 umfassenden mittleren Bereich des Entladungsgefäßes 2. Die Übergangsbereiche 42 und 44 sind ringnutartig ausgebildet, wobei sich die Zündhilfsschicht 30 dann über den gesamten Umfang der Übergangsbereiche 42, 44 erstreckt. Die Zündhilfsschicht gemäß dem zweiten Ausführungsbeispiel der Erfindung besitzt somit einen im Bereich des Entladungsraums angeordneten Schichtabschnitt 30, zwei in den ringnutartigen Übergangsbereichen angeordnete Schichtabschnitte 42, 44 und zwei auf den Quetschenden 4, 6 angeordnete Schichtabschnitte 38, 40. Die vorgenannten Schichtabschnitte bilden eine zusammenhängende Zündhilfsschicht.In the FIG. 4 is shown in a side view, the high-pressure discharge lamp 1 according to a second embodiment. In contrast to the first embodiment FIG. 1 is the Zündhilfsschicht 30 designed differently. This has here an upper and lower legs 38 and 40, each along a squeezing 4 or 6 extend. The legs 38 and 40 are arranged approximately in the region between the molybdenum foils 14 and 16 and extending along the discharge vessel 2 contact wire 26 in the lamp longitudinal direction on the squeezing 4 and 6 and surround these sections in the circumferential direction. Furthermore, the Zündhilfsschicht 30 is on a surface of a transition region 42 and 44 between a respective crimp end 4 and 6 and the discharge space 8 comprising the central region of the discharge vessel 2. The transition regions 42 and 44 are annular groove-like, with the Zündhilfsschicht 30 then over the entire circumference of the transition regions 42, 44 extends. The Zündhilfsschicht according to the second embodiment of the invention thus has a arranged in the discharge space layer portion 30, two arranged in the ringnutartigen transition areas layer sections 42, 44 and two arranged on the pinch ends 4, 6 layer sections 38, 40. The aforementioned layer sections form a coherent Zündhilfsschicht ,

Die in der Figur 1 ausgebildete Zündhilfsschicht 30 weist eine geringere Fläche im Vergleich zum Schichtabschnitt 30 der Zündhilfsschicht aus der Figur 4 auf. Hierdurch ist eine großflächigere Verteilung des Plasmas 37 um den Außenumfang des Entladungsgefäßes 2 ermöglicht.The in the FIG. 1 formed Zündhilfsschicht 30 has a smaller area compared to the layer portion 30 of the Zündhilfsschicht from the FIG. 4 on. As a result, a larger-area distribution of the plasma 37 around the outer circumference of the discharge vessel 2 is made possible.

Die Erfindung beschränkt sich nicht auf die oben näher beschriebenen Ausführungsbeispiele der Erfindung. Beispielsweise kann bei der in Figur 4 abgebildeten Zündhilfsschicht gemäß dem oben erläuterten zweiten Ausführungsbeispiel der Erfindung der auf dem sockelfernen Quetschende 4 angeordnete Schichtabschnitt 38 oder der auf dem sockelnahen Quetschende 6 angeordnete Schichtabschnitt 40 der Zündhilfsschicht entfallen, wodurch eine asymmetrisch ausgebildete Zündhilfsschicht erreicht wird.The invention is not limited to the embodiments of the invention described in detail above. For example, at the in FIG. 4 illustrated Zündhilfsschicht according to the above-described second embodiment of the invention arranged on the sockel-off squeezing 4 layer portion 38 or the Layer layer 40 of the ignition assist layer arranged on the base near pinch 6 can be dispensed with, as a result of which an asymmetrically formed auxiliary ignition layer is achieved.

Claims (9)

  1. High-pressure discharge lamp having a discharge vessel (2) in which a discharge chamber (8) is formed, two mutually spaced electrodes (10, 12) extending in the discharge chamber (8) to produce a gas discharge, the discharge vessel (2) being encompassed, at least in some sections, by an outer bulb (32), and a filling gas being introduced into a gas-tight outer chamber (34) that is delimited at least by the discharge vessel (2) and the outer bulb (32), and the discharge vessel (2) having a light-transmitting, electrically conductive ignition aid layer (30), characterized in that a non-electrically-conductive insulating layer (36) covering at least the ignition aid layer (30) is applied to the ignition aid layer (30) in order to separate the filling gas in the outer chamber (34) and the ignition aid layer (30), wherein the insulating layer (36) is an insulating layer (36) containing hexamethyl disiloxane (HMDSO) applied to the ignition aid layer (30) and the discharge vessel (2) by a low-pressure plasma in the cold process.
  2. High-pressure discharge lamp according to Claim 1, wherein the ignition aid layer (30) is applied to an outer surface of the discharge vessel (2) within the outer chamber (34).
  3. High-pressure discharge lamp according to Claim 1, wherein the insulating layer (36) is a glass layer.
  4. High-pressure discharge lamp according to Claim 1, wherein the insulating layer (36) is applied over the entire surface of the discharge vessel (2).
  5. High-pressure discharge lamp according to one of the preceding claims, wherein the ignition aid layer (30) is arranged on the discharge vessel (2) in the area of the discharge chamber (8) and extends over a section of the circumference of the discharge chamber (8).
  6. High-pressure discharge lamp according to one of the preceding claims, wherein the discharge vessel (2) has two pinched ends (4, 6) extending diametrically, and the ignition aid layer (30) is applied to at least one pinched end (4, 6), at least in some sections.
  7. High-pressure discharge lamp according to Claim 6, wherein the ignition aid layer (30) is additionally applied to at least one transition region (42, 44) between the discharge chamber (8) and a respective pinched end (4, 6), in some sections or over its entire circumference.
  8. High-pressure discharge lamp according to one of the preceding claims, wherein the filling gas has a pressure that is lower in comparison with standard atmospheric pressure and, in particular, is between 300 and 400 mbar or in particular between 150 and 250 mbar.
  9. High-pressure discharge lamp according to one of the preceding claims, wherein the filling gas is air.
EP11701802.8A 2010-01-26 2011-01-25 High pressure discharge lamp Not-in-force EP2497103B1 (en)

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Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1764866A1 (en) * 1968-08-21 1971-11-18 Patra Patent Treuhand Arrangement for restarting a high-pressure mercury vapor discharge lamp at operating temperature with additives
US6110544A (en) * 1997-06-26 2000-08-29 General Electric Company Protective coating by high rate arc plasma deposition
CN1436362A (en) * 2000-04-26 2003-08-13 康奈尔研究基金会股份有限公司 Lamp utilizing fibre for enhanced starting field
US6538377B1 (en) * 2000-11-03 2003-03-25 General Electric Company Means for applying conducting members to arc tubes
US9666425B2 (en) * 2005-01-03 2017-05-30 Koninklijke Philips N.V. Gas discharge lamp
JP2007042369A (en) * 2005-08-02 2007-02-15 Harison Toshiba Lighting Corp Metal-halide lamp and lighting device
DE102006007218A1 (en) * 2006-02-15 2007-08-16 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH High pressure discharge lamp
US8674591B2 (en) * 2006-07-07 2014-03-18 Koninklijke Philips N.V. Gas discharge lamp with outer cavity
JP5009984B2 (en) * 2006-07-07 2012-08-29 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Gas discharge lamp

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
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WO2011092146A1 (en) 2011-08-04
CN102725820A (en) 2012-10-10

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