EP0270890A2 - Motor vehicle headlamp unit - Google Patents

Motor vehicle headlamp unit Download PDF

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Publication number
EP0270890A2
EP0270890A2 EP87117108A EP87117108A EP0270890A2 EP 0270890 A2 EP0270890 A2 EP 0270890A2 EP 87117108 A EP87117108 A EP 87117108A EP 87117108 A EP87117108 A EP 87117108A EP 0270890 A2 EP0270890 A2 EP 0270890A2
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EP
European Patent Office
Prior art keywords
motor vehicle
pinch
vehicle headlight
reflector
headlight unit
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.)
Withdrawn
Application number
EP87117108A
Other languages
German (de)
French (fr)
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EP0270890A3 (en
Inventor
Manfred Gaugel
Jürgen Dr. vom Scheidt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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Publication of EP0270890A2 publication Critical patent/EP0270890A2/en
Publication of EP0270890A3 publication Critical patent/EP0270890A3/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/40—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades
    • F21S41/43—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades characterised by the shape thereof
    • F21S41/435—Hoods or cap-shaped
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/17—Discharge light sources
    • F21S41/172—High-intensity discharge light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/19—Attachment of light sources or lamp holders

Definitions

  • the invention relates to a motor vehicle headlight unit according to the preamble of claim 1.
  • Headlight units based on discharge lamps instead of incandescent lamps offer the advantages of a higher luminous efficacy and a longer service life.
  • discharge lamps pinched on one side in analogy to incandescent lamp technology.
  • the lamp is arranged axially with respect to the reflector and is pinched in the area of the (rear) pinch nearer the reflector apex (DE-OS 33 41 846), the base being fixed in an axial opening of the reflector apex.
  • the power supply to the light outlet opening facing (front) crushing is also returned along the discharge vessel to this base.
  • the distance between the two current leads which determines the high voltage strength can be chosen larger than in the case of a discharge lamp squeezed on one side.
  • Such an arrangement in which the front pinch projects cantilevered into the interior of the reflector, is susceptible to vibrations caused by uneven road surfaces. The vibrations that occur can lead to rapid material fatigue (plinth breakage).
  • the object of the invention is to improve the vibration resistance of headlight units which, as described in the introduction, have discharge lamps squeezed on both sides.
  • the invention largely prevents the transmission of vibrations to the lamp, taking into account the thermal expansion of the lamp.
  • a particularly advantageous embodiment of the invention provides that the electrical supply line for the power supply of the front pinch is led away from the discharge lamp via the holding device. In this way, the distance between the two power supplies is considerably increased compared to the prior art. At the same time, the base diameter can be reduced so that a larger effective reflector surface is available, which in turn enables a higher luminous efficiency. Alternatively, the reflector area and thus the headlight height can be reduced without having to accept losses in the luminous efficacy.
  • FIG. 1 shows a headlight unit for vehicles, consisting essentially of a reflector 1, a high-pressure discharge lamp 2 squeezed on both sides and a shielding means 3.
  • the flat rectangular spotlight made of plastic (height 50 mm) has a paraboloid shape curved reflector 1 made of heat-resistant plastic, preferably made of polyetherimide or polyphenylene sulfide.
  • the light exit opening of the reflector is covered with a lens 4 made of glass or plastic, for example acrylic.
  • the reflector apex 5 has an opening in the optical axis through which the discharge lamp 2, which is pinched on both sides and is aligned along the optical axis, is introduced into the reflector. It is a known metal halide discharge lamp with a power consumption of 35 W.
  • the lamp is 32 mm long and has a filling of mercury, an inert gas and additions of halides of the metals Na and Sc (alternatively Na, Tl and Sn are used).
  • the closer to the reflector apex 5, rear pinch 6 of the lamp is held in a cylindrical base part 7 made of plastic, which is fixed in the opening of the reflector apex 5.
  • a sleeve 8 surrounding the base part 7 made of temperature-resistant plastic seals the opening against splash water.
  • the power supply line 9 led out of the rear pinch 6 is guided centrally through the base part 7.
  • the base part 7 is pressed onto the reflector apex 5 from the outside by means of two brackets (not shown).
  • the shielding means 3 made of electrically insulating material (ceramic, micaver) has a channel 10 running along the lamp 2, the concave side of which faces the lamp.
  • the channel curvature encloses an angle of 165 °.
  • the groove 10 is completely circumferential and thus forms an annular holding element 11 which is seated on the sleeve 8.
  • the front pinch 12 of the discharge lamp 2 is guided in a cylindrical grommet 13 (inner diameter 5 mm), which is rigidly connected to the reflector 1 via a holding device 14 (the connection can be made, for example, by ultrasonic heating).
  • a holding device 14 the connection can be made, for example, by ultrasonic heating.
  • One of the webs 16 is equipped with a cable duct 17.
  • the spherical cap 15 also acts as a radiation diaphragm, in that the diameter of the spherical cap is dimensioned such that the light emitted by the discharge lamp 2 directly to the light exit opening is suppressed. As a result, additional shading by the holding device is avoided.
  • Figure 2 shows the attachment of the lamp 2 in the holding device 14 in detail.
  • the end of the front pinch 12 of the lamp 2 is surrounded by a cylindrical sleeve 18 made of metal, which projects in the direction of the lens, the projecting part tapering conically to a tip 19.
  • the power supply 20 led out from the front pinch 12 ends at the level of the conical tip 19 and is welded to it.
  • the conical tip 19 facilitates the threading of the lamp 2 into the spout 13, which is likewise made of metal and which closely surrounds the sleeve 18 in the region of the front pinch seal 12.
  • the sleeve 18 is slotted longitudinally to achieve a spring effect (not visible), so that a reliable electrical contact is made between the sleeve 13 and sleeve 18, this type of fixing the lamp taking into account the thermal expansion of the lamp during operation.
  • the threading of the lamp into the spout 13 is additionally facilitated in that the end 21 of the spout 13 facing the lamp 2 is widened.
  • the dome 15 is equipped on its concave inside with an annular bead 22 which has a circular slot adapted to the diameter of the spout 13.
  • the connection between annular bead 22 and spout 13 is e.g. by HF welding; the cap 15 and the webs 16 are made of plastic.
  • the electrical supply line to the power supply 20 forms a cable 23 which runs in the cable duct 17 formed on one of the webs 16.
  • the cable 23 ends at the grommet 13, to which it is attached by means of brazing.
  • the electrical lead to the power supply 20 of the front pinch 12 can be led out of the headlight at a great distance from the power supply 9 of the rear pinch, so that excellent high-voltage insulation is achieved. This property is important for the hot re-ignition of the lamp, for which voltages of approximately 15 kV are required.
  • the holding device itself is made entirely or partially (in particular one of the webs) from metal and thus forms part of the electrical supply line.
  • the lamp is operated at high frequency (10 kHz), the live lead being connected to the power supply 9 of the rear pinch 6 in both exemplary embodiments.
  • the power supply 20 of the front pinch 12 is grounded.
  • the lamp is as has already been proposed, equipped with a heater to shorten the start-up time.
  • the connections for the heater (12 V) are led out of the headlight within the base part 7, which is partly made of metal.
  • the ground line is advantageously connected to the power supply of the rear pinch, while the supply voltage for the lamp is supplied via the power supply to the front pinch.
  • the grommet and the holding device are made of non-conductive material (ceramic, plastic).
  • the electrical supply line is led through a hole in the grommet to the power supply emerging from the front pinch.
  • the invention is also applicable to elliptical headlights made of sheet metal or plastic, in which the shielding means does not have to be attached directly to the lamp, but in the second focal point.
  • the second focal point lies approximately in the middle between the lamp and the light exit opening closed with a lens.
  • the invention was only explained on the basis of a few detailed exemplary embodiments, other configurations are also possible.
  • the invention is also applicable to headlights without shielding means; likewise in the known discharge lamps pinched on both sides, in which the power supply of the front pinch is returned to the base part attached to the rear pinch.
  • the invention is also applicable to other types of headlights, e.g. for headlights equipped with facets or segments.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)

Abstract

Eine Kfz-Scheinwerfer-Einheit enthält einen Reflektor (1), in dem eine zweiseitig gequetschte Entladungslampe (2) axial angeordnet ist. Die der Lichtaustrittsöffnung zugewandte vordere Quetschung (12) der Lampe ist in einer zylindrischen Tülle (13) geführt, die über eine Haltevorrichtung (14) starr mit dem Reflektor (1) verbunden ist. Eine Hülse an der vorderen Quetschung (12) erleichtert das Einfädeln in die zylindrische Tülle (13). Die Anordnung gewährt einen verbesserten Vibrationsschutz. Außerdem wird die Hochspannungsisolation dadurch verbessert, daß die elektrische Zuleitung zu der aus der vorderen Quetschung (12) austretenden Stromzuführung über einen Kabelkanal (17) an der Haltevorrichtung (14) erfolgt.A motor vehicle headlight unit contains a reflector (1), in which a discharge lamp (2) pinched on two sides is arranged axially. The front pinch (12) of the lamp facing the light exit opening is guided in a cylindrical grommet (13) which is rigidly connected to the reflector (1) via a holding device (14). A sleeve on the front pinch (12) facilitates threading into the cylindrical spout (13). The arrangement provides improved vibration protection. In addition, the high-voltage insulation is improved in that the electrical supply line to the power supply emerging from the front pinch (12) takes place via a cable duct (17) on the holding device (14).

Description

Die Erfindung geht aus von einer Kfz-Scheinwerfer-­Einheit nach dem Oberbegriff des Anspruchs 1.The invention relates to a motor vehicle headlight unit according to the preamble of claim 1.

Scheinwerfereinheiten auf der Basis von Entladungs­lampen anstatt von Glühlampen bieten die Vorteile einer höheren Lichtausbeute und längerer Lebens­dauer. Zunächst wurden dabei, wie z.B. in der DE-OS 1 954 775 beschrieben, einseitig gequetschte Entladungslampen in Analogie zur Glühlampentechnik verwendet.Headlight units based on discharge lamps instead of incandescent lamps offer the advantages of a higher luminous efficacy and a longer service life. First, such as described in DE-OS 1 954 775, discharge lamps pinched on one side in analogy to incandescent lamp technology.

Später hat man die Verwendung von zweiseitig ge­quetschten Entladungslampen vorgeschlagen, u.a. in dem Bestreben, ein sicheres Zünden auch der heißen Lampe zu erleichtern. Hier ist die Möglichkeit einer besseren Isolation zwischen den getrennt aus den beiden Quetschungen herausgeführten Stromzuführungen gegeben (DE-OS 33 21 939).It was later proposed to use discharge lamps that were squeezed on both sides, including in an effort to facilitate safe lighting of the hot lamp. Here there is the possibility of better insulation between the current leads which are led out separately from the two squeezes (DE-OS 33 21 939).

Aus Gründen einer optimalen Ausnutzung der Lichtver­teilung - insbesondere dann, wenn auch Abschirmmittel zum Erzeugen von Abblendlicht vorgesehen sind - ist dabei die Lampe axial in bezug auf den Reflektor angeordnet und im Bereich der dem Reflektorscheitel näheren (hinteren) Quetschung gesockelt (DE-OS 33 41 846), wobei der Sockel in einer axialen Öffnung des Reflektorscheitels fixiert ist. Die Stromzuführung der der Lichtaustrittsöffnung zugewandten (vorderen) Quetschung ist ebenfalls entlang dem Entladungsgefäß zu diesem Sockel zurückgeführt. Hierbei kann der die Hochspannungs­festigkeit bestimmende Abstand zwischen den beiden Stromzuführungen größer gewählt werden als im Fall einer einseitig gequetschten Entladungslampe.For reasons of optimal utilization of the light distribution - in particular if shielding means are also provided for generating low beam - the lamp is arranged axially with respect to the reflector and is pinched in the area of the (rear) pinch nearer the reflector apex (DE-OS 33 41 846), the base being fixed in an axial opening of the reflector apex. The power supply to the light outlet opening facing (front) crushing is also returned along the discharge vessel to this base. In this case, the distance between the two current leads which determines the high voltage strength can be chosen larger than in the case of a discharge lamp squeezed on one side.

Eine derartige Anordnung, bei der die vordere Quetschung freitragend in den Innenraum des Reflek­tors hineinragt, ist jedoch anfällig für durch Fahrbahnunebenheiten hervorgerufene Erschütterungen. Die dabei auftretenden Vibrationen können zu einer schnellen Materialermüdung (Sockelbruch) führen.Such an arrangement, in which the front pinch projects cantilevered into the interior of the reflector, is susceptible to vibrations caused by uneven road surfaces. The vibrations that occur can lead to rapid material fatigue (plinth breakage).

Aufgabe der Erfindung ist es, die Vibrationsfestig­keit von Scheinwerfereinheiten, die - wie einleitend beschrieben - zweiseitig gequetschte Entladungslampen aufweisen, zu verbessern.The object of the invention is to improve the vibration resistance of headlight units which, as described in the introduction, have discharge lamps squeezed on both sides.

Diese Aufgabe wird erfindungsgemäß durch die kenn­zeichnenden Merkmale des Anspruchs 1 gelöst. Weitere vorteilhafte Ausgestaltungen der Erfindung können den Unteransprüchen entnommen werden.This object is achieved by the characterizing features of claim 1. Further advantageous embodiments of the invention can be found in the subclaims.

Durch die Erfindung wird die Übertragung von Vibra­tionen auf die Lampe weitgehend verhindert, wobei gleichzeitig die Wärmeausdehnung der Lampe berück­sichtigt wird.The invention largely prevents the transmission of vibrations to the lamp, taking into account the thermal expansion of the lamp.

Um ein etwaiges Auswechseln der Lampe zu erleichtern, ist es vorteilhaft, die vordere Quetschung der Lampe mit einer Einfädelungshilfe zu versehen.In order to facilitate any replacement of the lamp, it is advantageous to provide the front pinch of the lamp with a threading aid.

Eine besonders vorteilhafte Ausführungsform der Erfindung sieht vor, daß die elektrische Zuleitung für die Stromzuführung der vorderen Quetschung über die Haltevorrichtung von der Entladungslampe weggeführt wird. Auf diese Weise wird der Abstand zwischen den beiden Stromzuführungen im Vergleich zum Stand der Technik erheblich vergrößert. Gleichzeitig läßt sich der Sockeldurchmesser verkleinern, so daß eine größere effektive Reflektorfläche zur Verfügung steht, die wiederum eine höhere Lichtausbeute ermöglicht. Alter­nativ kann die Reflektorfläche und damit die Schein­werferbauhöhe verkleinert werden, ohne daß Verluste an der Lichtausbeute hingenommen werden müssen.A particularly advantageous embodiment of the invention provides that the electrical supply line for the power supply of the front pinch is led away from the discharge lamp via the holding device. In this way, the distance between the two power supplies is considerably increased compared to the prior art. At the same time, the base diameter can be reduced so that a larger effective reflector surface is available, which in turn enables a higher luminous efficiency. Alternatively, the reflector area and thus the headlight height can be reduced without having to accept losses in the luminous efficacy.

Weitere vorteilhafte Ausgestaltungen sollen anhand von Ausführungsbeispielen beschrieben werden.Further advantageous refinements are to be described on the basis of exemplary embodiments.

Mehrere Ausführungsbeispiele der Erfindung werden im folgenden näher erläutert. Es zeigen

  • Figur 1 eine teilweise geschnittene Seitenansicht eines Kfz-Scheinwerfers, der mit einer zwei­seitig gequetschten Entladungslampe bestückt ist
  • Figur 2 einen vergrößerten Ausschnitt aus dem Schein­werfer nach Figur 1 im Bereich der vorderen Quetschung der Entladungslampe
Several embodiments of the invention are explained in more detail below. Show it
  • Figure 1 is a partially sectioned side view of a motor vehicle headlight, which is equipped with a two-sided squeezed discharge lamp
  • Figure 2 shows an enlarged section of the headlight of Figure 1 in the area of the front pinch of the discharge lamp

Figur 1 zeigt ein Scheinwerfereinheit für Fahrzeuge, im wesentlichen bestehend aus einem Reflektor 1, einer zweiseitig gequetschten Hochdruckentladungslampe 2 und einem Abschirmmittel 3.FIG. 1 shows a headlight unit for vehicles, consisting essentially of a reflector 1, a high-pressure discharge lamp 2 squeezed on both sides and a shielding means 3.

Der aus Kunststoff gefertigte flache Rechteckschein­werfer (Bauhöhe 50 mm) besitzt einen paraboloidförmig gekrümmten Reflektor 1 aus wärmebeständigem Kunst­stoff, vorzugsweise aus Polyetherimid oder aus Polyphenylensulfid. Die Lichtaustrittsöffnung des Reflektors ist mit einer Streuscheibe 4 aus Glas oder Kunststoff, z.B. Acryl, abgedeckt. Der Reflektor­scheitel 5 weist in der optischen Achse eine Öffnung auf, durch die die entlang der optischen Achse ausgerichtete zweiseitig gequetschte Entladungslampe 2 in den Reflektor eingeführt ist. Es handelt sich um eine an sich bekannte Metallhalogenid-Entladungslampe mit einer Leistungsaufnahme von 35 W. Die Lampe ist 32 mm lang und besitzt eine Füllung aus Quecksilber, einem Edelgas und Zusätzen an Halogeniden der Metalle Na und Sc (alternativ kann auch Na, Tl und Sn verwen­det werden). Die dem Reflektorscheitel 5 nähere, hintere Quetschung 6 der Lampe ist in einem zylindri­schen Sockelteil 7 aus Kunststoff gehaltert, das in der Öffnung des Reflektorscheitels 5 befestigt ist. Eine das Sockelteil 7 umgebende Manschette 8 aus temperaturbeständigem Kunststoff dichtet die Öffnung gegen Spritzwasser ab. Die aus der hinteren Quetschung 6 herausgeführte Stromzuführung 9 ist mittig durch das Sockelteil 7 hindurchgeführt. Das Sockelteil 7 ist mittels zweier Bügel (nicht gezeigt) von außen an den Reflektorscheitel 5 angepreßt.The flat rectangular spotlight made of plastic (height 50 mm) has a paraboloid shape curved reflector 1 made of heat-resistant plastic, preferably made of polyetherimide or polyphenylene sulfide. The light exit opening of the reflector is covered with a lens 4 made of glass or plastic, for example acrylic. The reflector apex 5 has an opening in the optical axis through which the discharge lamp 2, which is pinched on both sides and is aligned along the optical axis, is introduced into the reflector. It is a known metal halide discharge lamp with a power consumption of 35 W. The lamp is 32 mm long and has a filling of mercury, an inert gas and additions of halides of the metals Na and Sc (alternatively Na, Tl and Sn are used). The closer to the reflector apex 5, rear pinch 6 of the lamp is held in a cylindrical base part 7 made of plastic, which is fixed in the opening of the reflector apex 5. A sleeve 8 surrounding the base part 7 made of temperature-resistant plastic seals the opening against splash water. The power supply line 9 led out of the rear pinch 6 is guided centrally through the base part 7. The base part 7 is pressed onto the reflector apex 5 from the outside by means of two brackets (not shown).

Das Abschirmmittel 3 aus elektrisch-isolierendem Material (Keramik, Micaver) weist eine entlang der Lampe 2 verlaufende Rinne 10 auf, deren konkave Seite der Lampe zugewandt ist. Die Rinnenwölbung umschließt einen Winkel von 165°. Im Bereich der hinteren Quet­schung ist die Rinne 10 vollständig umlaufend und bildet somit ein ringförmiges Halteelement 11, das auf der Manschette 8 aufsitzt.The shielding means 3 made of electrically insulating material (ceramic, micaver) has a channel 10 running along the lamp 2, the concave side of which faces the lamp. The channel curvature encloses an angle of 165 °. In the area of the rear pinch, the groove 10 is completely circumferential and thus forms an annular holding element 11 which is seated on the sleeve 8.

Die vordere Quetschung 12 der Entladungslampe 2 ist in einer zylindrischen Tülle 13 (Innendurchmesser 5 mm) geführt, die über eine Haltevorrichtung 14 starr mit dem Reflektor 1 verbunden ist (die Verbindung kann z.B. durch Ultraschallerwärmen erfolgen). Einer der Stege 16 ist einem Kabelkanal 17 ausgestattet.The front pinch 12 of the discharge lamp 2 is guided in a cylindrical grommet 13 (inner diameter 5 mm), which is rigidly connected to the reflector 1 via a holding device 14 (the connection can be made, for example, by ultrasonic heating). One of the webs 16 is equipped with a cable duct 17.

Bei dieser Anordnung wirkt die Kalotte 15 gleichzeitig als Strahlenblende, indem der Durchmesser der Kalotte so bemessen ist, daß das von der Entladungslampe 2 direkt zur Lichtaustrittsöffnung emittierte Licht ausgeblendet wird. Infolgedessen wird eine zusätzliche Abschattung durch die Haltevorrichtung vermieden.In this arrangement, the spherical cap 15 also acts as a radiation diaphragm, in that the diameter of the spherical cap is dimensioned such that the light emitted by the discharge lamp 2 directly to the light exit opening is suppressed. As a result, additional shading by the holding device is avoided.

Figur 2 zeigt die Befestigung der Lampe 2 in der Haltevorrichtung 14 im Detail. Das Ende der vorderen Quetschung 12 der Lampe 2 ist von einer zylindrischen Hülse 18 aus Metall umgeben, die in Richtung der Streuscheibe übersteht, wobei der überstehende Teil sich konisch zu einer Spitze 19 verjüngt. Die aus der vorderen Quetschung 12 herausgeführte Stromzuführung 20 endet in Höhe der konischen Spitze 19 und ist mit dieser verschweißt. Die konische Spitze 19 erleichtert das Einfädeln der Lampe 2 in die ebenfalls aus Metall gefertigte Tülle 13, die im Bereich der vorderen Quetschung 12 die Hülse 18 eng umgibt. Die Hülse 18 ist zur Erzielung einer Federwirkung längsgeschlitzt (nicht sichtbar), so daß ein sicherer elektrischer Kontakt zwischen Tülle 13 und Hülse 18 hergestellt wird, wobei diese Art der Fixierung der Lampe die thermische Ausdehnung der Lampe während des Betriebs berücksichtigt. Das Einfädeln der Lampe in die Tülle 13 wird zusätzlich dadurch erleichtert, daß das der Lampe 2 zugewandte Ende 21 der Tülle 13 aufgeweitet ist.Figure 2 shows the attachment of the lamp 2 in the holding device 14 in detail. The end of the front pinch 12 of the lamp 2 is surrounded by a cylindrical sleeve 18 made of metal, which projects in the direction of the lens, the projecting part tapering conically to a tip 19. The power supply 20 led out from the front pinch 12 ends at the level of the conical tip 19 and is welded to it. The conical tip 19 facilitates the threading of the lamp 2 into the spout 13, which is likewise made of metal and which closely surrounds the sleeve 18 in the region of the front pinch seal 12. The sleeve 18 is slotted longitudinally to achieve a spring effect (not visible), so that a reliable electrical contact is made between the sleeve 13 and sleeve 18, this type of fixing the lamp taking into account the thermal expansion of the lamp during operation. The threading of the lamp into the spout 13 is additionally facilitated in that the end 21 of the spout 13 facing the lamp 2 is widened.

Das von der Lampe abgewandte Ende der Tülle 13 ist an der Kalotte 15 befestigt. Zu diesem Zweck ist die Kalotte 15 an ihrer konkaven Innenseite mit einem Ringwulst 22 ausgestattet, die einen dem Durchmesser der Tülle 13 angepaßten kreisförmigen Schlitz aufweist. Die Verbindung zwischen Ringwulst 22 und Tülle 13 erfolgt z.B. durch HF-Verschweißen; die Kalotte 15 und die Stege 16 sind dabei aus Kunststoff hergestellt.The end of the nozzle 13 facing away from the lamp is fastened to the cap 15. For this purpose, the dome 15 is equipped on its concave inside with an annular bead 22 which has a circular slot adapted to the diameter of the spout 13. The connection between annular bead 22 and spout 13 is e.g. by HF welding; the cap 15 and the webs 16 are made of plastic.

Die elektrische Zuleitung zur Stromzuführung 20 bildet ein Kabel 23, das in dem an einem der Stege 16 angeformten Kabelkanal 17 verläuft. Das Kabel 23 endet an der Tülle 13, an der es mittels Hartlötung befestigt ist. Auf diese Weise kann die elektrische Zuleitung zur Stromzuführung 20 der vorderen Quet­schung 12 in großer Entfernung von der Stromzuführung 9 der hinteren Quetschung aus dem Scheinwerfer heraus­geführt werden, so daß eine ausgezeichnete Hochspan­nungsisolation erreicht wird. Diese Eigenschaft ist für das Heißwiederzünden der Lampe von Bedeutung, für das Spannungen von etwa 15 kV benötigt werden.The electrical supply line to the power supply 20 forms a cable 23 which runs in the cable duct 17 formed on one of the webs 16. The cable 23 ends at the grommet 13, to which it is attached by means of brazing. In this way, the electrical lead to the power supply 20 of the front pinch 12 can be led out of the headlight at a great distance from the power supply 9 of the rear pinch, so that excellent high-voltage insulation is achieved. This property is important for the hot re-ignition of the lamp, for which voltages of approximately 15 kV are required.

Bei einem anderen Ausführungsbeispiel ist die Halte­vorrichtung selbst vollständig oder teilweise (insbesondere einer der Stege) aus Metall gefertigt und bildet so einen Teil der elektrischen Zuleitung.In another exemplary embodiment, the holding device itself is made entirely or partially (in particular one of the webs) from metal and thus forms part of the electrical supply line.

Die Lampe wird mit Hochfrequenz (10 kHz) betrieben, wobei in beiden Ausführungsbeispielen die spannungs­führende Zuleitung an der Stromzuführung 9 der hinte­ren Quetschung 6 angeschlossen ist. Die Stromzuführung 20 der vorderen Quetschung 12 liegt an Masse.The lamp is operated at high frequency (10 kHz), the live lead being connected to the power supply 9 of the rear pinch 6 in both exemplary embodiments. The power supply 20 of the front pinch 12 is grounded.

In einem weiteren Ausführungsbeispiel ist die Lampe, wie bereits vorgeschlagen wurde, mit einer Heizung zur Verkürzung der Anlaufzeit ausgestattet. Die Anschlüsse für die Heizung (12 V) sind dabei innerhalb des Sockelteils 7, das teilweise aus Metall gefertigt ist, aus dem Scheinwerfer herausgeführt. In diesem Fall ist vorteilhaft die Masseleitung an die Stromzuführung der hinteren Quetschung gelegt, während die Versorgungs­spannung für die Lampe über die Stromzuführung der vorderen Quetschung zugeführt wird. Aus Gründen einer ausreichenden Isolation ist hierbei die Tülle und die Haltevorrichtung aus nichtleitendem Material (Keramik, Kunststoff) gefertigt. Die elektrische Zuleitung ist über eine Bohrung in der Tülle zu der aus der vorderen Quetschung austretenden Stromzuführung geführt.In another embodiment, the lamp is as has already been proposed, equipped with a heater to shorten the start-up time. The connections for the heater (12 V) are led out of the headlight within the base part 7, which is partly made of metal. In this case, the ground line is advantageously connected to the power supply of the rear pinch, while the supply voltage for the lamp is supplied via the power supply to the front pinch. For reasons of adequate insulation, the grommet and the holding device are made of non-conductive material (ceramic, plastic). The electrical supply line is led through a hole in the grommet to the power supply emerging from the front pinch.

Die Erfindung ist auch bei elliptischen Scheinwerfern aus Blech oder Kunststoff anwendbar, bei denen das Abschirmmittel nicht direkt an der Lampe, sondern im zweiten Brennpunkt angebracht sein muß. Der zweite Brennpunkt liegt etwa in der Mitte zwischen der Lampe und der mit einer Linse verschlossenen Lichtaustritts­öffnung. Die Zurückführung der Stromzuführung der vorderen Quetschung entlang der Lampe - wie sie bei den bekannten zweiseitig gequetschten Entladungslampen notwendig ist - würde zu einer merklichen Abschattung und außerdem zu einer unerwünschten inhomogenen Lichtverteilung führen. Dagegen wird jetzt die von einer Hülse umgebene vordere Quetschung in einer Tülle ähnlich dem ersten Ausführungsbeispiel geführt. Deren Haltevorrichtung wird durch drei schmale Stege gebildet, die radial von der Tülle abstehen und an der Reflektorinnenwand befestigt sind. Die elektrische Zuleitung zur Stromzuführung der vorderen Quetschung wird über einen der Stege an die Lampe geführt.The invention is also applicable to elliptical headlights made of sheet metal or plastic, in which the shielding means does not have to be attached directly to the lamp, but in the second focal point. The second focal point lies approximately in the middle between the lamp and the light exit opening closed with a lens. The return of the power supply of the front pinch along the lamp - as is necessary in the known bilaterally squeezed discharge lamps - would lead to a noticeable shadowing and also to an undesirable inhomogeneous light distribution. In contrast, the front pinch surrounded by a sleeve is now carried out in a grommet similar to the first embodiment. Their holding device is formed by three narrow webs that protrude radially from the spout and are attached to the inner wall of the reflector. The electrical lead for the power supply of the front pinch is led to the lamp via one of the webs.

Obwohl die Erfindung nur anhand einiger detaillierter Ausführungsbeispiele erläutert wurde, sind auch andere Ausgestalltungen möglich. Beispielsweise ist die Er­findung auch bei Scheinwerfern ohne Abschirmmittel anwendbar; ebenso bei den bekannten zweiseitig ge­quetschten Entladungslampen, bei denen die Stromzu­führung der vorderen Quetschung zu dem an der hinteren Quetschung angebrachten Sockelteil zurückgeführt ist. Schließlich ist die Erfindung auch bei anderen Schein­werfertypen anwendbar, z.B. bei mit Facetten oder Segmenten ausgestatteten Scheinwerfern.Although the invention was only explained on the basis of a few detailed exemplary embodiments, other configurations are also possible. For example, the invention is also applicable to headlights without shielding means; likewise in the known discharge lamps pinched on both sides, in which the power supply of the front pinch is returned to the base part attached to the rear pinch. Finally, the invention is also applicable to other types of headlights, e.g. for headlights equipped with facets or segments.

Claims (12)

1. Kfz-Scheinwerfer-Einheit mit folgenden Merkmalen:

      - ein Reflektor (1), dessen Lichtaustrittsöffnung mit einer Streuscheibe (4) bzw. Linse abgedeckt ist
      - eine zweiseitig gequetschte Entladungslampe (2), die entlang der optischen Achse des Reflektors (1) ange­ordnet ist, wobei an jeder Quetschung (6; 12) eine Stromzuführung (9; 20) aus der Entladungslampe (2) herausgeführt ist, und wobei die dem Reflektorschei­tel (5) nähere (die hintere) Quetschung (6) mit Hilfe eines Sockelteils (7) in einer axialen Öffnung des Reflektorscheitels fixiert ist
      - ggf. Abschirmmittel zum Erzeugen von Abblendlicht,

dadurch gekennzeichnet, daß die Entladungslampe (2) im Bereich des Endes der der Lichtaustrittsöffnung zugewandten (der vorderen) Quetschung (12) in einer eng anliegenden Aufnahme geführt ist, wobei diese Aufnahme über eine Haltevorrichtung (14) starr mit dem Reflektor (1) verbunden ist.1. Motor vehicle headlight unit with the following features:

- A reflector (1), the light exit opening is covered with a lens (4) or lens
- A bilaterally squeezed discharge lamp (2) which is arranged along the optical axis of the reflector (1), with a power supply (9; 20) being led out of the discharge lamp (2) at each pinch (6; 12), and wherein the the (rear) pinch (6) closer to the reflector apex (5) is fixed in an axial opening of the reflector apex with the aid of a base part (7)
- if necessary, shielding means for producing low beam,

characterized in that the discharge lamp (2) is guided in a close-fitting receptacle in the region of the end of the (front) pinch (12) facing the light exit opening, this receptacle being rigidly connected to the reflector (1) via a holding device (14) is. 2. Kfz-Scheinwerfer-Einheit nach Anspruch 1, dadurch gekennzeichnet, daß die Entladungslampe (2) an der vorderen Quetschung (12) eine Einfädelungshilfe zum Einführen in die Aufnahme aufweist.2. Motor vehicle headlight unit according to claim 1, characterized in that the discharge lamp (2) on the front pinch (12) has a threading aid for insertion into the receptacle. 3. Kfz-Scheinwerfer-Einheit nach Anspruch 1, dadurch gekennzeichnet, daß die Aufnahme als zylindrische Tülle (13) ausgeführt ist.3. Motor vehicle headlight unit according to claim 1, characterized in that the receptacle is designed as a cylindrical spout (13). 4. Kfz-Scheinwerfer-Einheit nach Anspruch 2 und 3, dadurch gekennzeichnet, daß die Einfädelungshilfe eine Hülse (18) ist, die das Ende der vorderen Quetschung (12) umgibt, und die in Richtung der Lichtaustritts­öffnung über das Ende dieser Quetschung (12) über­steht, wobei der überstehende Teil sich konisch verjüngt (19) und mit der aus dieser Quetschung (12) herausgeführten (vorderen) Stromzuführung (20) ver­bunden ist.4. Motor vehicle headlight unit according to claim 2 and 3, characterized in that the threading aid is a sleeve (18) which surrounds the end of the front pinch (12), and in the direction of the light outlet opening on the end of this pinch (12th ) protrudes, the projecting part tapering (19) and being connected to the (front) power supply (20) led out of this pinch (12). 5. Kfz-Scheinwerfer-Einheit nach Anspruch 1, dadurch gekennzeichnet, daß die Stromzuführung der vorderen Quetschung zum Sockel der hinteren Quetschung zurück­geführt ist.5. Motor vehicle headlight unit according to claim 1, characterized in that the power supply of the front pinch is returned to the base of the rear pinch. 6. Kfz-Scheinwerfer-Einheit nach Anspruch 1, dadurch gekennzeichnet, daß die Stromzuführung der vorderen Quetschung mit einer elektrischen Zuleitung verbunden ist, die über die Haltevorrichtung von der Entla­dungslampe weggeführt ist.6. Motor vehicle headlight unit according to claim 1, characterized in that the power supply of the front pinch is connected to an electrical feed line which is led away from the discharge lamp via the holding device. 7. Kfz-Scheinwerfer-Einheit nach Anspruch 4 und 6, dadurch gekennzeichnet, daß die Tülle (13) und die Hülse (18) aus Metall gefertigt sind und daß die vor­dere Stromzuführung (20) mit der elektrischen Zulei­tung über die Hülse (18) und die Tülle (13) verbunden ist.7. Motor vehicle headlight unit according to claim 4 and 6, characterized in that the grommet (13) and the sleeve (18) are made of metal and that the front power supply (20) with the electrical lead via the sleeve (18) and the spout (13) is connected. 8. Kfz-Scheinwerfer-Einheit nach Anspruch 6, dadurch gekennzeichnet, daß die Tülle aus nichtleitendem Material gefertigt ist, und daß die elektrische Zu­leitung über eine Bohrung in der Tülle zu der vor­deren Stromzuführung geführt ist.8. Motor vehicle headlight unit according to claim 6, characterized in that the spout is made of non-conductive material, and that the electrical lead is guided through a hole in the spout to the front power supply. 9. Kfz-Scheinwerfer-Einheit nach Anspruch 6, dadurch gekennzeichnet, daß die Haltevorrichtung selbst die elektrische Zuleitung bildet, indem sie vollständig oder teilweise aus Metall gefertigt ist.9. Motor vehicle headlight unit according to claim 6, characterized in that the holding device itself forms the electrical supply line by being made entirely or partially of metal. 10. Kfz-Scheinwerfer-Einheit nach Anspruch 3, dadurch gekennzeichnet, daß die Haltevorrichtung für die Tülle durch schmale Stege gebildet wird, die radial von der Tülle abstehen und an der Reflektorinnenwand befestigt sind.10. Motor vehicle headlight unit according to claim 3, characterized in that the holding device for the spout is formed by narrow webs which protrude radially from the spout and are attached to the inner reflector wall. 11. Kfz-Scheinwerfer-Einheit nach Anspruch 3, dadurch gekennzeichnet, daß die Haltevorrichtung (14) für die Tülle (13) durch eine Kalotte (15) gebildet wird, die das der Lichtaustrittsöffnung zugewandte Ende der Tülle (13) aufnimmt und die mittels radial abstehender Stege (16) an der Reflektorinnenwand befestigt ist.11. Motor vehicle headlight unit according to claim 3, characterized in that the holding device (14) for the spout (13) is formed by a cap (15) which receives the light outlet opening facing the end of the spout (13) and which by means radially projecting webs (16) is attached to the reflector inner wall. 12. Kfz-Scheinwerfer-Einheit nach Anspruch 11, dadurch gekennzeichnet, daß bei Verwendung eines paraboloid­förmigen Reflektors (1) der Durchmesser der Kalotte (15) so bemessen ist, daß die Kalotte (15) gleich­zeitig die Funktion einer Strahlenblende erfüllt.12. Motor vehicle headlight unit according to claim 11, characterized in that when using a paraboloidal reflector (1) the diameter of the spherical cap (15) is dimensioned such that the spherical cap (15) simultaneously fulfills the function of a radiation diaphragm.
EP87117108A 1986-12-08 1987-11-19 Motor vehicle headlamp unit Withdrawn EP0270890A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863641852 DE3641852A1 (en) 1986-12-08 1986-12-08 VEHICLE HEADLIGHT UNIT
DE3641852 1986-12-08

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EP0270890A2 true EP0270890A2 (en) 1988-06-15
EP0270890A3 EP0270890A3 (en) 1989-09-06

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US (1) US4774636A (en)
EP (1) EP0270890A3 (en)
JP (1) JPS63150801A (en)
DE (1) DE3641852A1 (en)

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EP0374846A2 (en) * 1988-12-21 1990-06-27 Gte Products Corporation Arc discharge headlamp system
FR2657681A1 (en) * 1990-01-30 1991-08-02 Bosch Gmbh Robert PROJECTOR FOR AUTOMOTIVE VEHICLES, THE LIGHT SOURCE OF WHICH IS A GAS DISCHARGE LAMP.
FR2985299A1 (en) * 2012-01-02 2013-07-05 Peugeot Citroen Automobiles Sa Positioning element for e.g. positioning lamp in headlight of car, has internal housing to receive front end of lamp during assembly of lamp, where periphery of housing includes guiding units that guide front end and are in form of strips

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JP3062912B2 (en) * 1994-04-26 2000-07-12 株式会社小糸製作所 Vehicle lighting
KR970702464A (en) * 1994-10-26 1997-05-13 요하네스 게라두스 알베르투스 롤페스 SIGNALLING SYSTEM
JP3269349B2 (en) * 1995-08-30 2002-03-25 ウシオ電機株式会社 Lamp device
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EP0374846A3 (en) * 1988-12-21 1991-02-27 Gte Products Corporation Arc discharge headlamp system
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FR2985299A1 (en) * 2012-01-02 2013-07-05 Peugeot Citroen Automobiles Sa Positioning element for e.g. positioning lamp in headlight of car, has internal housing to receive front end of lamp during assembly of lamp, where periphery of housing includes guiding units that guide front end and are in form of strips

Also Published As

Publication number Publication date
EP0270890A3 (en) 1989-09-06
US4774636A (en) 1988-09-27
JPS63150801A (en) 1988-06-23
DE3641852A1 (en) 1988-06-16

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