EP0517878A1 - Headlamp for motor vehicles. - Google Patents

Headlamp for motor vehicles.

Info

Publication number
EP0517878A1
EP0517878A1 EP92901842A EP92901842A EP0517878A1 EP 0517878 A1 EP0517878 A1 EP 0517878A1 EP 92901842 A EP92901842 A EP 92901842A EP 92901842 A EP92901842 A EP 92901842A EP 0517878 A1 EP0517878 A1 EP 0517878A1
Authority
EP
European Patent Office
Prior art keywords
reflector
central
section
horizontal
images
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.)
Granted
Application number
EP92901842A
Other languages
German (de)
French (fr)
Other versions
EP0517878B1 (en
Inventor
Henning Hogrefe
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0517878A1 publication Critical patent/EP0517878A1/en
Application granted granted Critical
Publication of EP0517878B1 publication Critical patent/EP0517878B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/33—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature
    • F21S41/331—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector consisting of complete annular areas
    • F21S41/333—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector consisting of complete annular areas with discontinuity at the junction between adjacent areas

Definitions

  • the invention relates to a headlight for motor vehicles according to the preamble of claim 1.
  • Such a headlight is known from DE-PS 753 691.
  • This headlight has a reflector with a central area and a peripheral area with differently shaped reflection surfaces.
  • a luminous element is arranged on the optical axis of the reflector.
  • a kink is formed at the transition between the central area and the peripheral area.
  • a high-beam headlight for motor vehicles is known from DE-OS 36 09 659.
  • This headlight has a reflector in the form of a paraboloid of revolution / on the optical axis of which a luminous element is arranged.
  • the reflector generates a parallel light beam with a pronounced maximum in the center of the light distribution, but with little scatter.
  • a diffuser is provided with optical elements through which the Reflector reflected light rays are deflected in the required direction and strength.
  • a disadvantage of the diffusing screen is that it cannot be arranged in a highly inclined manner, as is desirable in motor vehicles in order to achieve a low air resistance, since otherwise the light rays are also deflected vertically by the optical elements in an undesirable manner.
  • the lens with the optical elements is complex to manufacture.
  • the headlamp according to the invention with the characterizing features of claim 1 has the advantage that the desired light distribution is already generated by the reflector, with a horizontally scattered light beam and a high maximum light intensity in the center of the light distribution, so that the lens has no optical elements needs to show.
  • FIG. 1 shows a first embodiment of the headlamp in a horizontal central section
  • FIG. 2 shows the headlamp of FIG. 1 in a vertical central section
  • FIG. 3 shows a front view of the reflector of the headlamp of FIG. 1
  • FIG. 4 shows the light distribution generated by the reflector
  • FIG. 5 shows a second embodiment of a Headlights in the horizontal center section. Description of the embodiments
  • a high-beam headlight for motor vehicles shown in FIGS. 1 to 3 has a reflector 10 made of plastic, with a central axis 12 lying in the horizontal central plane 11, which is also the optical axis of the reflector 10 and on which a filament 13, not shown, is used as the luminous element Incandescent lamp is arranged.
  • the incandescent filament 13 is an axial filament extending along the optical axis 12.
  • the arc of a gas discharge lamp can also serve as the luminous element.
  • the light exit opening 'of the reflector 10 is covered by a light disk 14 which is arranged inclined with respect to the vertical.
  • the light pane 14 can also be arranged pivoted horizontally.
  • the reflector 10 is divided into a central area 16 and a peripheral area 17.
  • the central region 16 has an opening 20 for inserting the light source.
  • the peripheral region 17 adjoins the central region 16 in the light exit direction and in the radial direction.
  • the reflection area of the central area 16 contains a hyperbola 18 in the horizontal center section, as shown in FIG. 1, as a section curve.
  • the reflection area of the peripheral area 17 contains a parabola 19 in the horizontal center section as a section curve.
  • a kink 21 formed at the transition between the hyperbola 18 and the parabola 19 a kink 21 formed.
  • the first focal point Fil of the hyperbola 18 and the focal point FP of the parabola 19 are located at the same location, approximately in the middle of the filament 13.
  • the reflection surface of the central area contains a parabola 22 as the cutting curve is not identical to parabola 19.
  • the reflection surface of the peripheral region 17 contains a parabola 23 in the vertical center section as a section curve, which is identical to the parabola 19 in the horizontal center section, so that the reflection surface of the peri pheres area is formed by a paraboloid of revolution.
  • a radial step 24 is formed as a discontinuity.
  • the focal points F of the parabolas 22 and 23 are located at the same location as the focal points of the intersection curves in the horizontal central section, approximately in the middle of the filament 13.
  • the parabolas 22 and 23 have different focal lengths. In the transition from the vertical central section to the horizontal central section, the intersection curves resulting in axial longitudinal sections through the central region 16 continuously pass from the parabola 22 into the hyperbola 18.
  • the step 24 present in the vertical central section is becoming less pronounced and in the horizontal center ⁇ only a kink 21 or a smaller step is still available.
  • the peripheral region 17 of the reflector can be delimited at its upper and lower edge region by horizontal, flat surfaces 26, so that the parabola 23 does not extend to the front edge 27 of the reflector in the vertical central section.
  • FIG. 4 shows the light distribution delivered by the reflector 10 on a measuring screen arranged perpendicular to the optical axis 12 using several isolux lines 28 to 31, which represent lines of the same light intensity values of 0.1, 1, 10 and 100 lux.
  • the light distribution has a large horizontal width and a pronounced maximum in the center with high light intensity values.
  • the width of the light distribution is achieved by large images of the filament 13 reflected by the central region 16 of the reflector 10.
  • a horizontally scattered light beam is generated, which determines the width of the light distribution and only a small proportion of the maximum light intensity in the center of the Light distribution delivers.
  • Small images of the incandescent filament 13 are reflected into the center of the light distribution by the peripheral region 17 of the reflector 10, so that the desired high light intensity values arise there.
  • the parabola 23 in the vertical central section of the peripheral area can also be different from the parabola 19 in the horizontal central section, the reflecting surface of the peripheral area 17 then being formed by a general paraboloid.
  • the reflection surface of the peripheral region 17 can be designed such that the intersection curves in the horizontal and vertical center section are not pure parabolas, but rather their equations differ from the equation of a parabola, for example by correction factors. Otherwise, the reflection surface of the central area 16 in the horizontal central section can also contain an ellipse instead of the hyperbola 18 as a section curve, as a result of which a horizontally scattered light beam is likewise generated from the central area.
  • the central region of the reflector can be designed such that this light reflects into the center of the light distribution and the peripheral region can be designed such that this light reflects in a horizontally scattered light bundle.
  • the peripheral region of the reflector is designed as described in the first exemplary embodiment.
  • the central region 116 is divided into two halves 37 and 38 which abut one another in the vertical central plane 36.
  • the optical axes 39 and 40 of the two halves extend pivoted to one another in the horizontal central plane 11.
  • the optical axes 39, 40 can also can be arranged parallel to each other.
  • the halves 37, 38 have reflection surfaces which each contain a parabola in vertical axial sections through the respective optical axis 39, 40. In the respective horizontal axial section, the reflection surfaces of the halves 37, 38 each contain an ellipse 43.
  • F, F of the parabolas and the first focal points F, F PL PR EL ER of the ellipses 43 coincide for half each and lie on the respective optical axis 39, 40 on a perpendicular to the central axis 12 through the center of the filament 13.
  • the second focal points ⁇ points F ', F' of the ellipses 43 lie in the light exit direction
  • EL ER device on the respective optical axis 39, 40.
  • a kink 21 or a small step is formed between the central area 116 and the peripheral area 17.
  • a step is formed in the vertical central section as in the reflector shown in FIG. With this configuration of the central area 116, a horizontally scattered light beam is generated by the latter.

Landscapes

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

Abstract

Le projecteur présente un réflecteur (10) avec une zone centrale (16) et une zone périphérique (17) possédant des surfaces réfléchissantes différentes. Sur l'axe médian (12) du réflecteur est disposée une source lumineuse (13). La surface réfléchissante de la zone centrale (16) présente dans sa direction médiane verticale une parabole et dans sa section médiane horizontale une hyperbole. La surface réfléchissante de la zone périphérique (17) présente des paraboles à la fois dans sa section médiane verticale et dans sa section médiane horizontale. A travers la zone centrale (16), des images de grande dimension de la source lumineuse (13) sont reflétées sous la forme d'un faisceau lumineux dispersé horizontalement. A travers la zone périphérique (17), des images de petite dimension de la source lumineuse (13) sont reflétées vers le centre de la répartition de la lumière, de sorte que la répartition de la lumière présente globalement d'une part une grande largeur et d'autre part un maximum d'intensité lumineuse nettement marquée au centre.The projector has a reflector (10) with a central area (16) and a peripheral area (17) having different reflecting surfaces. On the median axis (12) of the reflector is arranged a light source (13). The reflecting surface of the central zone (16) has in its vertical median direction a parabola and in its horizontal median section a hyperbola. The reflecting surface of the peripheral zone (17) has parabolas both in its vertical middle section and in its horizontal middle section. Through the central area (16), large images of the light source (13) are reflected in the form of a horizontally dispersed light beam. Through the peripheral zone (17), small images of the light source (13) are reflected towards the center of the light distribution, so that the light distribution has on the one hand a large width and on the other hand a maximum of clearly marked light intensity in the center.

Description

Scheinwerfer für KraftfahrzeugeHeadlights for motor vehicles
Stand der TechnikState of the art
Die Erfindung geht aus von einem Scheinwerfer für Kraftfahrzeuge nach der Gattung des Anspruchs 1.The invention relates to a headlight for motor vehicles according to the preamble of claim 1.
Ein solcher Scheinwerfer ist durch die DE-PS 753 691 bekannt. Die¬ ser Scheinwerfer weist einen Reflektor mit einem zentralen Bereich und einem peripheren Bereich mit unterschiedlich geformten Refle¬ xionsflächen auf. Auf der optischen Achse des Reflektors ist ein Leuchtkörper angeordnet. Am Übergang zwischen dem zentralen Bereich und dem peripheren Bereich ist ein Knick gebildet.Such a headlight is known from DE-PS 753 691. This headlight has a reflector with a central area and a peripheral area with differently shaped reflection surfaces. A luminous element is arranged on the optical axis of the reflector. A kink is formed at the transition between the central area and the peripheral area.
Durch die DE-OS 36 09 659 ist ein Fernlichtscheinwerfer für Kraft¬ fahrzeuge bekannt. Dieser Scheinwerfer weist einen Reflektor in Form eines Rotationsparaboloids auf/ auf dessen optischer Achse ein Leuchtkörper angeordnet ist. Der Reflektor erzeugt ein paralleles Lichtbündel mit einem ausgeprägten Maximum im Zentrum der Lichtver¬ teilung, jedoch mit geringer Streuung. Zur Formung einer für das Fernlicht erwünschten Lichtverteilung mit einer hohen Lichtstärke im Zentrum der Lichtverteilung und einer horizontalen Streuung ist eine Streuscheibe vorgesehen, mit optischen Elementen, durch die die vom Reflektor reflektierten Lichtstrahlen in der erforderlichen Richtung und Stärke abgelenkt werden. Nachteilig bei der Streuscheibe ist je¬ doch, daß diese nicht stark geneigt angeordnet werden kann, wie dies bei Kraftfahrzeugen zur Erzielung eines geringen Luftwiderstands ge¬ wünscht ist, da die Lichtstrahlen sonst durch die optischen Elemente in unerwünschter Heise auch vertikal abgelenkt werden. Außerdem ist die Streuscheibe mit den optischen Elementen aufwendig- in der Her¬ stellung.A high-beam headlight for motor vehicles is known from DE-OS 36 09 659. This headlight has a reflector in the form of a paraboloid of revolution / on the optical axis of which a luminous element is arranged. The reflector generates a parallel light beam with a pronounced maximum in the center of the light distribution, but with little scatter. To form a light distribution desired for the high beam with a high light intensity in the center of the light distribution and a horizontal scattering, a diffuser is provided with optical elements through which the Reflector reflected light rays are deflected in the required direction and strength. A disadvantage of the diffusing screen, however, is that it cannot be arranged in a highly inclined manner, as is desirable in motor vehicles in order to achieve a low air resistance, since otherwise the light rays are also deflected vertically by the optical elements in an undesirable manner. In addition, the lens with the optical elements is complex to manufacture.
Vorteile der ErfindungAdvantages of the invention
Der erfindungsgemäße Scheinwerfer mit den kennzeichnenden Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, daß bereits durch den Reflektor die erwünschte Lichtverteilung erzeugt wird, mit einem horizontal gestreuten Lichtbündel und einer hohen maximalen Licht¬ stärke im Zentrum der Lichtverteilung, so daß die Lichtscheibe keine optischen Elemente aufzuweisen braucht.The headlamp according to the invention with the characterizing features of claim 1 has the advantage that the desired light distribution is already generated by the reflector, with a horizontally scattered light beam and a high maximum light intensity in the center of the light distribution, so that the lens has no optical elements needs to show.
Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung sind in den ünteransprüchen gekennzeichnet.Advantageous refinements and developments of the invention are characterized in the subordinate claims.
Zeichnungdrawing
Zwei Ausführungsbeispiele der Erfindung sind in der Zeichnung dar¬ gestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 ein erstes Ausführungsbeispiel des Scheinwerfers im horizontalen Mittelschnitt, Figur 2 den Scheinwerfer von Figur 1 im vertikalen Mittelschnitt, Figur 3 eine Vorderansicht des Reflektors des Scheinwerfers von Figur 1, Figur 4 die vom Reflektor erzeugte Lichtverteilung und Figur 5 ein zweites Ausführungsbeispiel eines Scheinwerfers im horizontalen Mittelschnitt. Beschreibung der AusführungsbeispieleTwo exemplary embodiments of the invention are shown in the drawing and explained in more detail in the description below. 1 shows a first embodiment of the headlamp in a horizontal central section, FIG. 2 shows the headlamp of FIG. 1 in a vertical central section, FIG. 3 shows a front view of the reflector of the headlamp of FIG. 1, FIG. 4 shows the light distribution generated by the reflector, and FIG. 5 shows a second embodiment of a Headlights in the horizontal center section. Description of the embodiments
Ein in den Figuren 1 bis 3 dargestellter Fernlichtscheinwerfer für Kraftfahrzeuge weist einen Reflektor 10 aus Kunststoff auf, mit einer in der horizontalen Mittelebene 11 liegenden Mittelachse 12, die zugleich die optische Achse des Reflektors 10 ist und auf der als Leuchtkörper eine Glühwendel 13 einer nicht dargestellten Glüh¬ lampe angeordnet ist. Die Glühwendel 13 ist eine sich entlang der optischen Achse 12 erstreckende Axialwendel. Als Leuchtkörper kann jedoch auch der Lichtbogen einer Gasentladungslampe dienen. Die Lichtaustrittsöffnung' des Reflektors 10 ist durch eine bezüglich der Vertikalen geneigt angeordnete Lichtscheibe 14 abgedeckt. Die Licht¬ scheibe 14 kann außerdem auch horizontal geschwenkt angeordnet sein.A high-beam headlight for motor vehicles shown in FIGS. 1 to 3 has a reflector 10 made of plastic, with a central axis 12 lying in the horizontal central plane 11, which is also the optical axis of the reflector 10 and on which a filament 13, not shown, is used as the luminous element Incandescent lamp is arranged. The incandescent filament 13 is an axial filament extending along the optical axis 12. However, the arc of a gas discharge lamp can also serve as the luminous element. The light exit opening 'of the reflector 10 is covered by a light disk 14 which is arranged inclined with respect to the vertical. The light pane 14 can also be arranged pivoted horizontally.
Der Reflektor 10 ist in einen zentralen Bereich 16 und einen peri¬ pheren Bereich 17 unterteilt. Der zentrale Bereich 16 weist eine Öffnung 20 zum Einsetzen der Lichtquelle auf. Der periphere Bereich 17 schließt sich in Lichtaustrittsrichtung und in radialer Richtung an den zentralen Bereich 16 an. Die Reflexionsfläche des zentralen Bereichs 16 enthält im horizontalen Mittelschnitt, wie in Figur 1 dargestellt, als Schnittkurve eine Hyperbel 18. Die Reflexionsfläche des peripheren Bereichs 17 enthält im horizontalen Mittelschnitt als Schnittkurve eine Parabel 19. Am Übergang zwischen der Hyperbel 18 und der Parabel 19 ist ein Knick 21 gebildet. Der erste Brennpunkt Fil der Hyperbel 18 und der Brennpunkt FP der Parabel 19 liegen am gleichen Ort, etwa in der Mitte der Glühwendel 13. Im vertikalen Mittelschnitt enthält die Reflexionsfläche des zentralen Bereichs, wie in Figur 2 dargestellt, als Schnittkurve eine Parabel 22, die nicht mit der Parabel 19 identisch ist. Die Reflexionsfläche des peripheren Bereichs 17 enthält im vertikalen Mittelschnitt als Schnittkurve eine Parabel 23, die mit der Parabel 19 im horizontalen Mittelschnitt identisch ist, so daß die Reflexionsfläche des peri- pheren Bereichs durch ein Rotationsparaboloid gebildet ist. Am Über¬ gang zwischen der Parabel 22 des zentralen Bereichs 16 und der Para¬ bel 23 des peripheren Bereichs 17 ist als Diskontinuität eine radia¬ le Stufe 24 gebildet. Die BrennpunkteF der Parabeln 22 und 23 liegen am gleichen Ort wie die Brennpunkte der Schnittkurven im horizontalen Mittelschnitt, etwa in der Mitte der Glühwendel 13. Die Parabeln 22 und 23 weisen unterschiedliche Brennweiten auf. Beim Übergang vom vertikalen Mittelschnitt zum horizontalen Mittelschnitt gehen die sich in axialen Längsschnitten durch den zentralen Bereich 16 ergebenden Schnittkurven von der Parabel 22 kontinuierlich über in die Hyperbel 18. Dabei wird die im vertikalen Mittelschnitt vor¬ handene Stufe 24 immer weniger ausgeprägt und im horizontalen Mit¬ telschnitt ist nur noch der Knick 21 oder eine geringere Stufe vor¬ handen.The reflector 10 is divided into a central area 16 and a peripheral area 17. The central region 16 has an opening 20 for inserting the light source. The peripheral region 17 adjoins the central region 16 in the light exit direction and in the radial direction. The reflection area of the central area 16 contains a hyperbola 18 in the horizontal center section, as shown in FIG. 1, as a section curve. The reflection area of the peripheral area 17 contains a parabola 19 in the horizontal center section as a section curve. At the transition between the hyperbola 18 and the parabola 19 a kink 21 formed. The first focal point Fil of the hyperbola 18 and the focal point FP of the parabola 19 are located at the same location, approximately in the middle of the filament 13. In the vertical central section, the reflection surface of the central area, as shown in FIG. 2, contains a parabola 22 as the cutting curve is not identical to parabola 19. The reflection surface of the peripheral region 17 contains a parabola 23 in the vertical center section as a section curve, which is identical to the parabola 19 in the horizontal center section, so that the reflection surface of the peri pheres area is formed by a paraboloid of revolution. At the transition between the parabola 22 of the central area 16 and the parabola 23 of the peripheral area 17, a radial step 24 is formed as a discontinuity. The focal points F of the parabolas 22 and 23 are located at the same location as the focal points of the intersection curves in the horizontal central section, approximately in the middle of the filament 13. The parabolas 22 and 23 have different focal lengths. In the transition from the vertical central section to the horizontal central section, the intersection curves resulting in axial longitudinal sections through the central region 16 continuously pass from the parabola 22 into the hyperbola 18. The step 24 present in the vertical central section is becoming less pronounced and in the horizontal center ¬ only a kink 21 or a smaller step is still available.
Der periphere Bereich 17 des Reflektors kann an seinem oberen und unteren Randbereich durch horizontale, ebene Flächen 26 begrenzt sein, so daß sich die Parabel 23 im vertikalen Mittelschnitt nicht bis zum Vorderrand 27 des Reflektors erstreckt.The peripheral region 17 of the reflector can be delimited at its upper and lower edge region by horizontal, flat surfaces 26, so that the parabola 23 does not extend to the front edge 27 of the reflector in the vertical central section.
In Figur 4 ist die vom Reflektor 10 auf einem senkrecht zur opti¬ schen Achse 12 angeordneten Meßschirm gelieferte Lichtverteilung anhand mehrere Isoluxlinien 28 bis 31 dargestellt, die Linien glei¬ cher Lichtstärkewerte von 0.1, 1, 10 und 100 Lux darstellen. Die Lichtverteilung weist eine große horizontale Breite und ein ausge¬ prägtes Maximum im Zentrum mit hohen Lichtstärkewerten auf. Die Breite der Lichtverteilung wird durch vom zentralen Bereich 16 des Reflektors 10 reflektierte große Abbildungen der Glühwendel 13 er¬ reicht. Durch die Ausbildung des zentralen Bereichs 16 mit der Hy¬ perbel im horizontalen Mittelschnitt wird ein horizontal gestreutes Lichtbündel erzeugt, das die Breite der Lichtverteilung bestimmt und nur einen geringen Anteil zur maximalen Lichtstärke im Zentrum der Lichtverteilung liefert. Durch den peripheren Bereich 17 des Reflek¬ tors 10 werden kleine Abbildungen der Glühwendel 13 in das Zentrum der Lichtverteilung reflektiert, so daß dort die erwünschten hohen Lichtstärkewerte entstehen.FIG. 4 shows the light distribution delivered by the reflector 10 on a measuring screen arranged perpendicular to the optical axis 12 using several isolux lines 28 to 31, which represent lines of the same light intensity values of 0.1, 1, 10 and 100 lux. The light distribution has a large horizontal width and a pronounced maximum in the center with high light intensity values. The width of the light distribution is achieved by large images of the filament 13 reflected by the central region 16 of the reflector 10. By forming the central area 16 with the hybrid in the horizontal central section, a horizontally scattered light beam is generated, which determines the width of the light distribution and only a small proportion of the maximum light intensity in the center of the Light distribution delivers. Small images of the incandescent filament 13 are reflected into the center of the light distribution by the peripheral region 17 of the reflector 10, so that the desired high light intensity values arise there.
Bei einer nicht dargestellten Variante kann die Parabel 23 im ver¬ tikalen Mittelschnitt des peripheren Bereichs auch von der Parabel 19 im horizontalen Mittelschnitt verschieden sein, wobei dann die Reflexionsfläche des peripheren Bereichs 17 durch ein allgemeines Paraboloid gebildet ist. Außerdem kann die Reflexionsfläche des pe¬ ripheren Bereichs 17 so ausgebildet werden, daß die Schnittkurven im horizontalen und vertikalen Mittelschnitt keine reinen Parabeln sind, sondern deren Gleichungen sich von der Gleichung einer Parabel beispielsweise durch Korrekturfaktoren unterscheiden. Im übrigen kann die Reflexionsfläche des zentralen Bereichs 16 im horizontalen Mittelschnitt anstelle der Hyperbel 18 als Schnittkurve auch eine Ellipse enthalten, wodurch ebenfalls ein horizontal gestreutes Lichtbündel vom zentralen Bereich erzeugt wird. Außerdem kann umge¬ kehrt wie beim vorstehenden Ausführungsbeispiel der zentrale Bereich des Reflektors so ausgebildet sein, daß dieser Licht in das Zentrum der Lichtverteilung refle tiert und der periphere Bereich so ausge¬ bildet sein, daß dieser Licht in einem horizontal gestreuten Licht¬ bündel reflektiert.In a variant not shown, the parabola 23 in the vertical central section of the peripheral area can also be different from the parabola 19 in the horizontal central section, the reflecting surface of the peripheral area 17 then being formed by a general paraboloid. In addition, the reflection surface of the peripheral region 17 can be designed such that the intersection curves in the horizontal and vertical center section are not pure parabolas, but rather their equations differ from the equation of a parabola, for example by correction factors. Otherwise, the reflection surface of the central area 16 in the horizontal central section can also contain an ellipse instead of the hyperbola 18 as a section curve, as a result of which a horizontally scattered light beam is likewise generated from the central area. In addition, as in the preceding exemplary embodiment, the central region of the reflector can be designed such that this light reflects into the center of the light distribution and the peripheral region can be designed such that this light reflects in a horizontally scattered light bundle.
Bei einem in Figur 5 im horizontalen Mittelschnitt dargestellten zweiten Ausführungsbeispiel des Scheinwerfers ist der periphere Be¬ reich des Reflektors wie beim ersten Ausführungsbeispiel beschrieben ausgebildet. Der zentrale Bereich 116 ist abweichend vom ersten Aus¬ führungsbeispiel in zwei sich in der vertikalen Mittelebene 36 stoßende Hälften 37 und 38 geteilt. Die optischen Achsen 39 und 40 der beiden Hälften erstrecken sich in der horizontalen Mittelebene 11 zueinander geschwenkt. Die optischen Achsen 39, 40 können auch parallel zueinander verschoben angeordnet werden. Die Hälften 37, 38 weisen Reflexionsflächen auf, die in vertikalen Axialschnitten durch die jeweilige optische Achse 39, 40 jeweils eine Parabel enthalten. Im jeweiligen horizontalen Axialschnitt enthalten die Reflexions¬ flächen der Hälften 37, 38 jeweils eine Ellipse 43. Die BrennpunkteIn a second exemplary embodiment of the headlamp shown in FIG. 5 in the horizontal central section, the peripheral region of the reflector is designed as described in the first exemplary embodiment. In a departure from the first exemplary embodiment, the central region 116 is divided into two halves 37 and 38 which abut one another in the vertical central plane 36. The optical axes 39 and 40 of the two halves extend pivoted to one another in the horizontal central plane 11. The optical axes 39, 40 can also can be arranged parallel to each other. The halves 37, 38 have reflection surfaces which each contain a parabola in vertical axial sections through the respective optical axis 39, 40. In the respective horizontal axial section, the reflection surfaces of the halves 37, 38 each contain an ellipse 43. The focal points
F , F der Parabeln sowie die ersten BrennpunkteF , F PL PR EL ER der Ellipsen 43 fallen für jeweils eine Hälfte zusammen und liegen auf der jeweiligen optischen Achse 39, 40 auf einer Senkrechten zur Mittelachse 12 durch die Mitte der Glühwendel 13. Die zweiten Brenn¬ punkte F' , F' der Ellipsen 43 liegen in Lichtaustrittsrich-F, F of the parabolas and the first focal points F, F PL PR EL ER of the ellipses 43 coincide for half each and lie on the respective optical axis 39, 40 on a perpendicular to the central axis 12 through the center of the filament 13. The second focal points ¬ points F ', F' of the ellipses 43 lie in the light exit direction
EL ER tung auf der jeweiligen optischen Achse 39, 40. Beim Übergang vom horizontalen Axialschnitt zum vertikalen Axialschnitt 'wandern' die zweiten Brennpunkte F' , F' der Ellipsen 43 zur Lage der zweiten Brennpunkte der Parabeln im Unendlichen. Im horizontalen Mittelschnitt ist zwischen dem zentralen Bereich 116 und dem peri¬ pheren Bereich 17 ein Knick 21 oder eine kleine Stufe gebildet. Im vertikalen Mittelschnitt ist wie bei dem in Figur 2 dargestellten Reflektor eine Stufe gebildet. Auch bei dieser Ausbildung des zen¬ tralen Bereichs 116 wird durch diesen ein horizontal gestreutes Lichtbündel erzeugt. EL ER device on the respective optical axis 39, 40. In the transition from the horizontal axial section to the vertical axial section, the second focal points F ', F' of the ellipses 43 'migrate to the position of the second focal points of the parabolas at infinity. In the horizontal central section, a kink 21 or a small step is formed between the central area 116 and the peripheral area 17. A step is formed in the vertical central section as in the reflector shown in FIG. With this configuration of the central area 116, a horizontally scattered light beam is generated by the latter.

Claims

Ansprüche Expectations
1. Scheinwerfer für Kraftfahrzeuge, insbesondere Fernlichtscheinwer¬ fer, mit einem Reflektor (10), der einen zentralen Bereich (16) und einen peripheren Bereich (17) mit unterschiedlichen Reflexions¬ flächen aufweist an deren Übergang eine Diskontinuität (21, 24) vor¬ handen ist, wobei die Lichtaustrittsöffnung des Reflektors (10) mit einer Lichtscheibe (14) abgedeckt ist und auf deren Mittelachse (12) des Reflektors (10) ein Leuchtkörper (13) angeordnet ist, dadurch gekennzeichnet, daß durch einen der Bereiche (16, 17) Abbildungen des Leuchtkörpers (13) horizontal gestreut reflektiert werden und durch den anderen Bereich (16, 17) Abbildungen des Leuchtkörpers (13) in das Zentrum der vom Reflektor (10) erzeugten Lichtverteilung reflektiert werden.1. Headlights for motor vehicles, in particular high-beam headlights, with a reflector (10) which has a central region (16) and a peripheral region (17) with different reflecting surfaces at the transition of which there is a discontinuity (21, 24) is present, the light exit opening of the reflector (10) being covered with a lens (14) and a luminous element (13) being arranged on the central axis (12) of the reflector (10), characterized in that one of the regions (16, 17) images of the filament (13) are reflected horizontally scattered and through the other area (16, 17) images of the filament (13) are reflected into the center of the light distribution generated by the reflector (10).
2. Scheinwerfer nach Anspruch 1, dadurch gekennzeichnet, daß der zentrale Bereich (16) die Abbildungen des Leuchtkörpers (13) ge¬ streut reflektiert und der periphere Bereich (17) die Abbildungen des Leuchtkörpers (13) in das Zentrum der Lichtverteilung reflek¬ tiert.2. Headlamp according to claim 1, characterized in that the central region (16) reflects the images of the luminous element (13) and the peripheral region (17) reflects the images of the luminous element (13) into the center of the light distribution .
3. Scheinwerfer nach Anspruch 2, dadurch gekennzeichnet, daß die Reflexionsfläche des zentralen Bereichs (16) im vertikalen Mittel¬ schnitt als Schnittkurve eine Parabel (19) enthält. 3. Headlamp according to claim 2, characterized in that the reflection surface of the central region (16) in the vertical Mittel¬ section contains a parabola (19) as a section curve.
4. Scheinwerfer nach Anspruch 2, dadurch gekennzeichnet, daß die Reflexionsfläche des zentralen Bereichs (16) im horizontalen Längs¬ schnitt als Schnittkurve eine Hyperbel (18) oder eine hyperbelähn¬ liche Kurve enthält.4. Headlamp according to claim 2, characterized in that the reflection surface of the central region (16) in the horizontal longitudinal section as a section curve contains a hyperbola (18) or a hyperbelike curve.
5. Scheinwerfer nach Anspruch 2, dadurch gekennzeichnet, daß die Reflexionsfläche des zentralen Bereichs (16) im horizontalen Längs¬ schnitt als Schnittkurve eine Ellipse oder eine ellipsenähnliche Kurve enthält.5. Headlamp according to claim 2, characterized in that the reflection surface of the central region (16) in the horizontal longitudinal section contains an ellipse or an ellipse-like curve as a section curve.
6. Scheinwerfer nach Anspruch 2, dadurch gekennzeichnet, daß der zentrale Bereich (16) in zwei sich in der vertikalen Mittelebene (36) des Reflektors (10) stoßende Hälften (37, 38) unterteilt ist, wobei sich die optischen Achsen (39, 40) der beiden Hälften in der horizontalen Mittelebene (11) voneinander abweichend erstrecken.6. Headlight according to claim 2, characterized in that the central region (16) is divided into two halves (37, 38) abutting in the vertical central plane (36) of the reflector (10), the optical axes (39, 40) of the two halves in the horizontal central plane (11) differ from each other.
7. Scheinwerfer nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Reflexionsfläche des peripheren Bereichs (17) in axialen Längsschnitten als Schnittkurven Parabeln (22, 23) oder parabelähnliche Kurven enthält. 7. Headlight according to one of the preceding claims, characterized in that the reflection surface of the peripheral region (17) in axial longitudinal sections contains parabolas (22, 23) or parabola-like curves as intersection curves.
EP92901842A 1991-01-09 1991-12-21 Headlamp for motor vehicles Expired - Lifetime EP0517878B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4100411 1991-01-09
DE4100411A DE4100411A1 (en) 1991-01-09 1991-01-09 HEADLIGHTS FOR MOTOR VEHICLES
PCT/DE1991/001004 WO1992012379A1 (en) 1991-01-09 1991-12-21 Headlamp for motor vehicles

Publications (2)

Publication Number Publication Date
EP0517878A1 true EP0517878A1 (en) 1992-12-16
EP0517878B1 EP0517878B1 (en) 1995-11-15

Family

ID=6422719

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92901842A Expired - Lifetime EP0517878B1 (en) 1991-01-09 1991-12-21 Headlamp for motor vehicles

Country Status (6)

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US (1) US5400226A (en)
EP (1) EP0517878B1 (en)
JP (1) JP3156793B2 (en)
DE (2) DE4100411A1 (en)
ES (1) ES2079848T3 (en)
WO (1) WO1992012379A1 (en)

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Also Published As

Publication number Publication date
US5400226A (en) 1995-03-21
WO1992012379A1 (en) 1992-07-23
JPH05505495A (en) 1993-08-12
EP0517878B1 (en) 1995-11-15
DE4100411A1 (en) 1992-07-16
ES2079848T3 (en) 1996-01-16
JP3156793B2 (en) 2001-04-16
DE59106919D1 (en) 1995-12-21

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