EP0517878B1 - Headlamp for motor vehicles - Google Patents
Headlamp for motor vehicles Download PDFInfo
- Publication number
- EP0517878B1 EP0517878B1 EP92901842A EP92901842A EP0517878B1 EP 0517878 B1 EP0517878 B1 EP 0517878B1 EP 92901842 A EP92901842 A EP 92901842A EP 92901842 A EP92901842 A EP 92901842A EP 0517878 B1 EP0517878 B1 EP 0517878B1
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- European Patent Office
- Prior art keywords
- reflector
- region
- central
- light
- light distribution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 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 GB-A-2 138 930.
- This headlight has a reflector with a main area with a paraboloid shape and with partial areas with an ellipsoid shape.
- the light exit opening of the reflector is covered with a lens which is partially provided with optical elements.
- a luminous element is arranged on the central axis of the reflector.
- the partial areas of the reflector with an ellipsoidal shape are arranged in lateral areas starting from the center of the reflector and these have a first focal point in the area of the luminous element and a second focal point in the center of the lens.
- the lens has optical elements, but is smooth in its center and has no optical elements there.
- This design of the headlight is intended to prevent the light reflected from the partial regions of the reflector from being deflected in an undesirable manner in the vertical direction when it passes through the lens in the case of a strongly inclined lens.
- the light distribution illuminating the area in front of the motor vehicle is generated by deflecting the light reflected from the paraboloid main area of the reflector parallel to the optical axis of the reflector by the optical elements of the lens. Strongly effective optical elements are required for this.
- a headlight which has a central area and a peripheral area with differently shaped reflection surfaces.
- a luminous element is arranged on the optical axis of the reflector. At the transition between the central area and the peripheral area of the reflector there is a discontinuity in the form of a kink.
- a high beam headlight for motor vehicles 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 beams are also undesirably deflected vertically by the optical elements.
- 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 does not need to have any optical elements .
- 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.
- 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 arranged inclined with respect to the vertical.
- the lens 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 F H of the hyperbola 18 and the focal point F P of the parabola 19 are located at the same location, approximately in the middle of the incandescent filament 13.
- the reflection surface of the central area contains a parabola 22 as a section curve that is not identical to parabola 19.
- the reflective surface of the peripheral region 17 contains a parabola 23 in the vertical central section as a section curve, which is identical to the parabola 19 in the horizontal central section, so that the reflective surface of the peripheral region Area is formed by a paraboloid of revolution.
- a radial step 24 is formed as a discontinuity.
- the focal points F P 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. During 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 becomes less and less pronounced and is only in the horizontal central section the kink 21 or a lower step is still present.
- 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 by means of 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 by the peripheral region 17 of the reflector 10 into the center of the light distribution, so that the desired high luminous intensity values arise there.
- the parabola 23 in the vertical central section of the peripheral region can also differ from the parabola 19 in the horizontal central section, in which case the reflective surface of the peripheral region 17 is 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 their equations differ from the equation of a parabola, for example by correction factors.
- the reflection surface of the central region 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 region.
- the central region of the reflector can be designed such that it reflects light into the center of the light distribution and the peripheral region can be designed such that this light reflects in a horizontally scattered light beam.
- 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 meet 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 PL , F PR of the parabolas and the first focal points F EL , F ER of the ellipses 43 each coincide with one another and lie on the respective optical one Axis 39, 40 on a perpendicular to the central axis 12 through the center of the filament 13.
- the second focal points F ' EL , F' ER of the ellipses 43 lie in the light exit direction on the respective optical axis 39, 40. In the transition from the horizontal axial section to the vertical axial section 'wander' the second focal points F ' EL , F' ER of the ellipses 43 to the location of the second focal points of the parabolas at infinity.
- 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. In this configuration of the central region 116, too, a horizontally scattered light bundle is generated by the latter.
Abstract
Description
Die Erfindung betrifft einen 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 GB-A-2 138 930 bekannt. Dieser Scheinwerfer weist einen Reflektor auf mit einem Hauptbereich mit paraboloider Form und mit Teilbereichen mit ellipsoider Form. Die Lichtaustrittsöffnung des Reflektors ist mit einer Lichtscheibe abgedeckt, die bereichsweise mit optischen Elementen versehen ist. Auf der Mittelachse des Reflektors ist ein Leuchtkörper angeordnet. Die Teilbereiche des Reflektors mit ellipsoider Form sind ausgehend vom Zentrum des Reflektors in seitlichen Bereichen angeordnet und diese weisen einen ersten Brennpunkt im Bereich des Leuchtkörpers auf und einen zweiten Brennpunkt im Zentrum der Lichtscheibe auf. Die Lichtscheibe weist optische Elemente auf, ist jedoch in ihrem Zentrum glatt ausgebildet und weist dort keine optischen Elemente auf. Durch diese Ausbildung des Scheinwerfers soll verhindert werden, daß bei einer stark geneigt angeordneten Lichtscheibe das von den Teilbereichen des Reflektors reflektierte Licht beim Durchtritt durch die Lichtscheibe in unerwünschter Weise in vertikaler Richtung abgelenkt wird. Die den Bereich vor dem Kraftfahrzeug beleuchtende Lichtverteilung wird erzeugt, indem das vom paraboloiden Hauptbereich des Reflektors parallel zur optischen Achse des Reflektors reflektierte Licht durch die optischen Elemente der Lichtscheibe abgelenkt wird. Hierzu sind stark wirksame optische Elemente erforderlich.Such a headlight is known from GB-A-2 138 930. This headlight has a reflector with a main area with a paraboloid shape and with partial areas with an ellipsoid shape. The light exit opening of the reflector is covered with a lens which is partially provided with optical elements. A luminous element is arranged on the central axis of the reflector. The partial areas of the reflector with an ellipsoidal shape are arranged in lateral areas starting from the center of the reflector and these have a first focal point in the area of the luminous element and a second focal point in the center of the lens. The lens has optical elements, but is smooth in its center and has no optical elements there. This design of the headlight is intended to prevent the light reflected from the partial regions of the reflector from being deflected in an undesirable manner in the vertical direction when it passes through the lens in the case of a strongly inclined lens. The light distribution illuminating the area in front of the motor vehicle is generated by deflecting the light reflected from the paraboloid main area of the reflector parallel to the optical axis of the reflector by the optical elements of the lens. Strongly effective optical elements are required for this.
Durch die DE-PS 753 691 ist außerdem ein Scheinwerfer bekannt, der einen zentralen Bereich und einen peripheren Bereich mit unterschiedlich geformten Reflexionsflächen aufweist. Auf der optischen Achse des Reflektors ist ein Leuchtkörper angeordnet. Am Übergang zwischen dem zentralen Bereich und dem peripheren Bereich des Reflektors ist eine Diskontinuität in Form eines Knicks vorhanden.From DE-PS 753 691 a headlight is also known which has a central area and a peripheral area with differently shaped reflection surfaces. A luminous element is arranged on the optical axis of the reflector. At the transition between the central area and the peripheral area of the reflector there is a discontinuity in the form of a kink.
Durch die DE-OS 36 09 659 ist ein Fernlichtscheinwerfer für Kraftfahrzeuge 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 Lichtverteilung, 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 jedoch, daß diese nicht stark geneigt angeordnet werden kann, wie dies bei Kraftfahrzeugen zur Erzielung eines geringen Luftwiderstands gewünscht ist, da die Lichtstrahlen sonst durch die optischen Elemente in unerwünschter Weise auch vertikal abgelenkt werden. Außerdem ist die Streuscheibe mit den optischen Elementen aufwendig in der Herstellung.From DE-OS 36 09 659 a high beam headlight for motor vehicles is known. 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 beams are also undesirably deflected vertically by the optical elements. In addition, the lens with the optical elements is complex to manufacture.
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 Lichtstärke 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 does not need to have any optical elements .
Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung sind in den Unteransprüchen gekennzeichnet.Advantageous refinements and developments of the invention are characterized in the subclaims.
Zwei Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt 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.Two embodiments of the invention are shown in the drawing and explained in more detail in the following description. 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.
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 Glühlampe 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 Lichtscheibe 14 kann außerdem auch horizontal geschwenkt angeordnet sein.A high-beam headlight for motor vehicles shown in FIGS. 1 to 3 has a
Der Reflektor 10 ist in einen zentralen Bereich 16 und einen peripheren 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 FH 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 peripheren Bereichs durch ein Rotationsparaboloid gebildet ist. Am Übergang zwischen der Parabel 22 des zentralen Bereichs 16 und der Parabel 23 des peripheren Bereichs 17 ist als Diskontinuität eine radiale Stufe 24 gebildet. Die Brennpunkte FP 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 vorhandene Stufe 24 immer weniger ausgeprägt und im horizontalen Mittelschnitt ist nur noch der Knick 21 oder eine geringere Stufe vorhanden.The
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
In Figur 4 ist die vom Reflektor 10 auf einem senkrecht zur optischen Achse 12 angeordneten Meßschirm gelieferte Lichtverteilung anhand mehrere Isoluxlinien 28 bis 31 dargestellt, die Linien gleicher Lichtstärkewerte von 0.1, 1, 10 und 100 Lux darstellen. Die Lichtverteilung weist eine große horizontale Breite und ein ausgeprägtes 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 erreicht. Durch die Ausbildung des zentralen Bereichs 16 mit der Hyperbel 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 Reflektors 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
Bei einer nicht dargestellten Variante kann die Parabel 23 im vertikalen 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 peripheren 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 umgekehrt wie beim vorstehenden Ausführungsbeispiel der zentrale Bereich des Reflektors so ausgebildet sein, daß dieser Licht in das Zentrum der Lichtverteilung reflektiert und der periphere Bereich so ausgebildet sein, daß dieser Licht in einem horizontal gestreuten Lichtbündel reflektiert.In a variant not shown, the
Bei einem in Figur 5 im horizontalen Mittelschnitt dargestellten zweiten Ausführungsbeispiel des Scheinwerfers ist der periphere Bereich des Reflektors wie beim ersten Ausführungsbeispiel beschrieben ausgebildet. Der zentrale Bereich 116 ist abweichend vom ersten Ausführungsbeispiel 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 Reflexionsflächen der Hälften 37, 38 jeweils eine Ellipse 43. Die Brennpunkte FPL, FPR der Parabeln sowie die ersten Brennpunkte FEL, FER 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 Brennpunkte F′EL, F′ER der Ellipsen 43 liegen in Lichtaustrittsrichtung auf der jeweiligen optischen Achse 39, 40. Beim Übergang vom horizontalen Axialschnitt zum vertikalen Axialschnitt 'wandern' die zweiten Brennpunkte F′EL, F′ER der Ellipsen 43 zur Lage der zweiten Brennpunkte der Parabeln im Unendlichen. Im horizontalen Mittelschnitt ist zwischen dem zentralen Bereich 116 und dem peripheren 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 zentralen Bereichs 116 wird durch diesen ein horizontal gestreutes Lichtbündel erzeugt.In 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
Claims (7)
- Headlamp for motor vehicles, in particular main beam headlamp, having a reflector (10) which has a central region (16) and a peripheral region (17) with different reflective surfaces, at whose transition there is a discontinuity (21, 24), having a lamp glass (14) covering the light exit opening of the reflector (10), and having an illuminating body (13) arranged on the central axis (12) of the reflector (10), images of the illuminating body (13) being reflected from a region (16, 17) of the reflector (10), scattering horizontally, and the horizontally scattered images of the illuminating body (13) contributing a horizontally scattered bundle of light to the light distribution generated by the reflector (10), characterized in that images of the illuminating body (13) are reflected, by the other region (16, 17) of the reflector (10), into the centre of the light distribution produced by the reflector (10), and in that the region in front of the motor vehicle is illuminated with the light distribution generated by the reflector (10).
- Headlamp according to Claim 1, characterized in that the central region (16) reflects the images of the illuminating body (13) in a scattered manner and the peripheral region (17) reflects the images of the illuminating body (17) into the centre of the light distribution.
- Headlamp according to Claim 2, characterized in that the reflective surface of the central region (16) contains, in the vertical central section, a parabola (19) as curve of intersection.
- Headlamp according to Claim 2, characterized in that the reflective surface of the central region (16) contains, in the horizontal longitudinal section, a hyperbola (18) or a hyperbola-like curve as curve of intersection.
- Headlamp according to Claim 2, characterized in that the reflective surface of the central region (16) contains, in the horizontal longitudinal section, an ellipse or an ellipse-like curve as curve of intersection.
- Headlamp according to Claim 2, characterized in that the central region (16) is subdivided into two halves (37, 38) which abut in the vertical central plane (36) of the reflector (10), the optical axes (39, 40) of the two halves extending deviating from each other in the horizontal central plane (11).
- Headlamp according to one of the previous claims, characterized in that the reflective surface of the peripheral region (17) contains, in axial longitudinal sections, parabolas (22, 23) or parabola-like curves as curves of intersection.
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 EP0517878A1 (en) | 1992-12-16 |
| EP0517878B1 true 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)
| Country | Link |
|---|---|
| US (1) | US5400226A (en) |
| EP (1) | EP0517878B1 (en) |
| JP (1) | JP3156793B2 (en) |
| DE (2) | DE4100411A1 (en) |
| ES (1) | ES2079848T3 (en) |
| WO (1) | WO1992012379A1 (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2750647B2 (en) * | 1992-08-14 | 1998-05-13 | 株式会社小糸製作所 | Vehicle headlight reflector |
| US5826973A (en) * | 1995-09-14 | 1998-10-27 | Melzian; John M. | Illuminated display with uniform luminance |
| JP3193604B2 (en) * | 1995-12-25 | 2001-07-30 | 株式会社小糸製作所 | Vehicle lamp having a discharge bulb |
| DE19603529A1 (en) * | 1996-02-01 | 1997-08-07 | Bosch Gmbh Robert | Car headlamp |
| US20050013140A1 (en) * | 2003-07-17 | 2005-01-20 | Currie Joseph Edward | Original equipment automotive elongated side marker lights |
| FR2875578B1 (en) * | 2004-09-21 | 2006-12-15 | Valeo Vision Sa | SIGNALING LIGHT, IN PARTICULAR FOR MOTOR VEHICLE |
| US7697421B2 (en) * | 2005-04-21 | 2010-04-13 | Avaya Inc. | Method and apparatus for quality-of-service-based admission control |
| US8081565B2 (en) * | 2005-04-21 | 2011-12-20 | Avaya Inc. | Method and apparatus for adaptive control of system parameters for admission control |
| US7357545B2 (en) * | 2005-08-10 | 2008-04-15 | Visteon Global Technologies, Inc. | Multi-focal lens for bi-functional headlamp |
| US9234646B2 (en) * | 2008-05-23 | 2016-01-12 | Huizhou Light Engine Ltd. | Non-glare reflective LED lighting apparatus with heat sink mounting |
| EP2276973B1 (en) * | 2008-05-23 | 2012-11-21 | Huizhou Light Engine Ltd. | Non-glare reflective led lighting apparatus with heat sink mounting |
| JP5797099B2 (en) * | 2011-11-21 | 2015-10-21 | 株式会社小糸製作所 | Lighting fixtures for vehicles |
| US10018341B2 (en) | 2014-07-31 | 2018-07-10 | JST Performance, LLC | Method and apparatus for a light collection and projection system |
Family Cites Families (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB178388A (en) * | 1921-01-04 | 1922-04-04 | Duncan James Ritchie | Improvements in headlamps for automobiles |
| US1394896A (en) * | 1921-01-17 | 1921-10-25 | Jr Cromwell A B Halvorson | Headlight-reflector |
| US1575327A (en) * | 1924-05-02 | 1926-03-02 | Garford Francis Sydney | Headlight |
| US1610124A (en) * | 1924-06-30 | 1926-12-07 | Hall C M Lamp Co | No-glare headlight |
| GB440293A (en) * | 1934-11-20 | 1935-12-24 | Andrew Lumisden Strange | Improvements in and connected with anti-dazzle devices for vehicle headlamps |
| DE753691C (en) * | 1940-05-17 | 1953-01-19 | Schanzenbach & Co G M B H | Broad beam mirror reflector |
| FR973391A (en) * | 1948-10-09 | 1951-02-09 | Reflector | |
| NL287712A (en) * | 1962-01-17 | |||
| US3492474A (en) * | 1966-12-02 | 1970-01-27 | Koito Mfg Co Ltd | Reflector with compound curvature reflecting surface |
| US4447865A (en) * | 1982-05-13 | 1984-05-08 | General Electric Company | Reflector lamp |
| FR2528537B1 (en) * | 1982-06-09 | 1987-03-20 | Cibie Projecteurs | CROSSING PROJECTORS FOR MOTOR VEHICLES |
| FR2545152B1 (en) * | 1983-04-27 | 1985-08-16 | Cibie Projecteurs | |
| US4494176A (en) * | 1984-03-14 | 1985-01-15 | General Electric Company | Lamps having multiple and aimed parabolic sections for increased useful light output |
| HU191444B (en) * | 1984-09-21 | 1987-02-27 | Tungsram Rt,Hu | Reflector lamp |
| FR2579721B1 (en) * | 1985-03-26 | 1988-10-14 | Cibie Projecteurs | TWO PROJECTOR ROAD LIGHTING ASSEMBLY FOR MOTOR VEHICLE |
| US4825344A (en) * | 1986-02-20 | 1989-04-25 | Stanley Electric Co., Ltd. | Headlamp for vehicles |
| JP2604646B2 (en) * | 1991-01-28 | 1997-04-30 | 株式会社小糸製作所 | Vehicle headlight reflector |
| DE4123658A1 (en) * | 1991-07-17 | 1993-01-21 | Bosch Gmbh Robert | HEADLIGHTS FOR MOTOR VEHICLES |
-
1991
- 1991-01-09 DE DE4100411A patent/DE4100411A1/en not_active Withdrawn
- 1991-12-21 WO PCT/DE1991/001004 patent/WO1992012379A1/en active IP Right Grant
- 1991-12-21 JP JP50163292A patent/JP3156793B2/en not_active Expired - Fee Related
- 1991-12-21 DE DE59106919T patent/DE59106919D1/en not_active Expired - Fee Related
- 1991-12-21 ES ES92901842T patent/ES2079848T3/en not_active Expired - Lifetime
- 1991-12-21 EP EP92901842A patent/EP0517878B1/en not_active Expired - Lifetime
- 1991-12-21 US US07/930,388 patent/US5400226A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3156793B2 (en) | 2001-04-16 |
| US5400226A (en) | 1995-03-21 |
| ES2079848T3 (en) | 1996-01-16 |
| WO1992012379A1 (en) | 1992-07-23 |
| EP0517878A1 (en) | 1992-12-16 |
| DE59106919D1 (en) | 1995-12-21 |
| JPH05505495A (en) | 1993-08-12 |
| DE4100411A1 (en) | 1992-07-16 |
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