EP0933585B1 - Kfz-Scheinwerfer mit einer querliegenden Lichtquelle und zum Erzeugen von einer scharfen Lichtbegrenzung - Google Patents

Kfz-Scheinwerfer mit einer querliegenden Lichtquelle und zum Erzeugen von einer scharfen Lichtbegrenzung Download PDF

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Publication number
EP0933585B1
EP0933585B1 EP99400178A EP99400178A EP0933585B1 EP 0933585 B1 EP0933585 B1 EP 0933585B1 EP 99400178 A EP99400178 A EP 99400178A EP 99400178 A EP99400178 A EP 99400178A EP 0933585 B1 EP0933585 B1 EP 0933585B1
Authority
EP
European Patent Office
Prior art keywords
mirror
source
headlight according
horizontal
filament
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP99400178A
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English (en)
French (fr)
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EP0933585A1 (de
Inventor
Benoit Reiss
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.)
Valeo Vision SAS
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Valeo Vision SAS
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Filing date
Publication date
Application filed by Valeo Vision SAS filed Critical Valeo Vision SAS
Publication of EP0933585A1 publication Critical patent/EP0933585A1/de
Application granted granted Critical
Publication of EP0933585B1 publication Critical patent/EP0933585B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F21S41/30—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
    • F21S41/334—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector consisting of patch like sectors
    • F21S41/335—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector consisting of patch like sectors with continuity at the junction between adjacent areas
    • 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
    • F21S41/173—Fluorescent light sources

Definitions

  • the present invention relates generally to motor vehicle headlamps.
  • parabolic mirror projectors or self-generating beam cut-off surface (especially passing beam or fog beam) generally have, at least at said mirror, a width substantially greater than their height.
  • obtaining a good quality light beam imposes, in particular to give it a concentration point in the axis of the road, to build the beam with a significant proportion of images of the light source (typically the filament of an incandescent lamp or the arc of a discharge lamp), which are of small size, and this therefore imposes to design a mirror with areas extending as far as possible from the source, and for the aforementioned reasons for congestion, these zones can not in the convenient to be far from the source only in a lateral direction.
  • the light source typically the filament of an incandescent lamp or the arc of a discharge lamp
  • the large extent of the mirror above and below the source will generate in this case, with an axial source, a large proportion of images strongly inclined relative to the horizontal, it is that is to say, slightly inclined relative to the vertical, and this will contribute firstly to degrade the quality of the cut, secondly to illuminate the road too close to the vehicle, and thirdly to make difficult the obtaining a beam of good width.
  • a fog lamp with a source cross and a mirror may have a height greater than its width.
  • This section is defined for its upper part by a piece of parabola 20h focused at a fixed point Fh (or "high focus") located behind the filament 10, and for its lower part by another piece of parabola 20b focused in another fixed point Fb (or “low focus”) located in front of the filament 10. It is understood that such sections inevitably lead to generating images of the filament which either project upwards over a horizontal cut defined in FIG. intersection of the yy axis with a projection screen, and materialized in "C” in Figure 1 (case including an image I1 emitted by the upper part of the mirror), or are excessively offset downwards relative to the cutoff C (in particular an image I2 generated by an intermediate region of the lower part of the mirror).
  • the projector described in this document is only capable of generating a flat-cut fog light, and there is no indication or suggestion in this document of how a more complex cut-beam could be produced, in particular a passing beam. European or American type.
  • the mirror described in this anteriority is incapable of giving the light beam a substantial width by itself, and it is therefore impossible to have recourse to a glass devoid of optical elements for spreading the light, which nevertheless is often desired by stylists.
  • the present invention therefore aims to overcome these limitations of the state of the art and to allow a projector whose mirror can have a reduced width compared to conventional projectors, and a height at least equal to this width, while free from these limitations.
  • the present invention proposes a motor vehicle headlamp as defined in claim 1.
  • FIGS. 2 and 3 there is shown components of a motor vehicle headlight, namely the generally cylindrical filament 10 of its lamp and its mirror 20.
  • the other elements of the projector namely housing, closing glass and various ancillary equipment, have not been shown and are conventional in themselves.
  • the source could, alternatively, be constituted for example by the generally cylindrical arc of a discharge lamp.
  • the axis of the filament 10 extends, according to a first important characteristic of the invention, horizontally and perpendicularly to the optical axis y-y of the mirror. It may be typically either the transverse filament of a standard lamp H3 mounted axially at the bottom of the mirror, or the axial filament of a lamp H1 or H7 mounted laterally in the mirror.
  • the vertical high and low generatrices, respectively 20h and 20b, of the mirror 20 are designed so as to bring all the images of the filament 10 flush with the horizontal level, so as to be able to generate, as one will see in detail later, clean cut beams of good quality.
  • the generators are constructed by drawing lines D1 tangent to the surface of the filament 10, these lines being on the back side of the filament with respect to the upper generator 20h, and being on the front side of the filament with respect to the generator 20b.
  • each of these lines D1 corresponding to a light ray emitted by an edge of the filament 10, are respectively associated lines D2 parallel to the optical axis y-y of the mirror, which itself is substantially parallel to the axis of the vehicle.
  • Each generator is built step by step, starting from the bottom of the mirror 20 that is fixed at a predetermined dimension with respect to the filament, from different TG lines obtained, to define a curved line, which will be called in the following "evolutionary generator” to the extent that it does not present a fixed focus, but a set of foci that evolve gradually as one moves along said generator.
  • These generators are distinguished from that of fixed focus generators, that is to say parabolic, described with reference to Figure 1.
  • each image of the filament 10 that they generate is located immediately below and flush with a horizontal cut that passes through the yy axis. .
  • this horizontal generatrix is given a parabolic appearance, with a focus that can be either centered on the filament 10, or preferably shifted laterally thereto, and the vertical generator described above along this horizontal generatrix, this sliding consisting of a translation without rotation of said vertical generator (that is to say, it remains parallel to the y0z.) along the horizontal generatrix.
  • FIG. 4 shows, by isocandal curves, the general shape of a beam that would be obtained with the vertical parabolic half-generators of FIG. 1, and it is observed in particular, in the central region, a light defect immediately at the below the DC cut, which is explained by the presence in this region of images of the filament whose highest point is shifted downwards relative to the cut, and in the lateral regions, an overflow of light above this cut, which is explained by the presence of images whose highest point is located above this cut.
  • FIG. 5 which illustrates the shape of a beam that will be obtained on the one hand with the generator of the invention illustrated in FIG. 2, and on the other hand with a horizontal generatrix consisting of two half left and right paraboles respectively focused near the left and right ends of the filament 10, shows that the cut DC is defined substantially over the entire width of the beam.
  • FIGS. 6 and 7 illustrate the image plots obtained with a mirror as defined above in terms of horizontal generatrix and vertical generatrix, for a defocusing ⁇ F equal to about half the length of the filament, ie about 2 mm for a filament 4 mm in length, and for a mirror with a height of 150 mm and a width of 80 mm, in which the filament 10 is placed halfway up. It is observed in these figures that the horizontal images of the filament all come immediately below the cutoff (namely the horizontal level 0%), whereas the inclined images are positioned with their highest point located substantially on this cutoff. .
  • FIGS. 8 and 9 illustrate the corresponding isocandela curves.
  • FIG. 10 illustrates the shape of the whole beam obtained.
  • a mirror for a fog beam can be obtained by using a horizontal generatrix consisting of a straight line perpendicular to the y-y axis.
  • the mirror thus has a cylindrical reflective surface which will have the property of generating images of the filament which are all located below and at the raz of the cut, and which at the same time are strongly offset laterally with respect to the center of the beam .
  • the thickness of the beam will be independent of the height of the mirror. Indeed, the longer the mirror is extended upwards or downwards, the smaller the image size of the generated filament is reduced, these images remaining aligned below the cutoff. It is therefore understandable that one can play on the height of the mirror to control the concentration of light immediately below the cut.
  • a passing beam according to the European regulations is preferably generated by dividing the mirror 20 into different areas as illustrated in FIG. 11.
  • the mirror has an upper half 21 and a lower half 22, which each comprise nine zones, respectively 211 to 219 and 221 to 229.
  • the different zones have relatively similar widths, and typically between 6 and 13 mm, and are essentially characterized by different horizontal generatrices, defined as a function of the desired lateral shift and spreading of the light.
  • central areas 215 and 225 which generate images of the filament 10 which are horizontal or very slightly inclined relative to the horizontal, are intended to achieve the horizontal cut over a large extent.
  • Their horizontal generatrix is advantageously a straight line.
  • the other areas of the mirror are used to ensure a satisfactory light distribution of light in the different areas of the beam.
  • the other zones may optionally have, according to the function assigned to them, surfaces of different types, and in particular surfaces derived from the teachings of documents FR-A-2,536,502 , FR-A-2,536,503 , FR-A-2 602 305 , FR-A-2 602 306 , FR-A-2,609,146 , FR-A-2,609,148 , FR-A-2,639,888 , FR-A-2,664,677 and FR-A-2,710,393 , in the name of the Applicant.
  • the generated beam has a reduced thickness
  • the vertical generator it is possible, for certain zones, to construct the vertical generator not from the actual, typically circular contour of the source, but from a fictitious contour, in particular a circle, which is larger (or on the contrary smaller) than the effective cross section of the filament.
  • a fictitious contour in particular a circle, which is larger (or on the contrary smaller) than the effective cross section of the filament.
  • Figures 12 to 20 illustrate by sets of isocandal curves the beam portions which are generated respectively by the zones 214, 213, 212, 211, 216, 217, 218, 219 and 215 of the mirror of Figure 11, while Figures 21 and 22 illustrate the shape obtained by superimposing respectively the beam portions of the figures. 12 to 15 and the beam portions of Figures 16 to 19.
  • FIG. 23 illustrates the shape of the beam portion generated by the upper half of the mirror of FIG. 11, while FIG. 24 illustrates the shape of the beam portion generated by its lower half.
  • Figure 25 illustrates the appearance of the overall beam obtained. It is observed that this is a beam having all the qualities required in terms of width, thickness and concentration in the axis of the road.
  • the present invention makes it possible to achieve, through the use of a transverse source and vertical generators as described above, mirrors capable of generating by themselves, or with the intervention of optical elements on the closure glass , projectors whose width is substantially less than the height.
  • the ratio between height and width can be between 1.2: 1 and 4: 1.
  • the horizontal generatrix of the mirror may be designed to perform or not to spread the light in width.
  • this spreading can be carried out by streaking the ice. It is also possible to perform a combined spreading by the mirror and the ice.

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

Claims (15)

  1. Kraftfahrzeugscheinwerfer mit einer Lichtquelle (10), einem Reflektor (20) und einer Scheibe, wobei der Reflektor mit der Lichtquelle zusammenzuwirken vermag, um ein Lichtbündel zu erzeugen, das von einer Hell-Dunkel-Grenze begrenzt ist, die wenigstens zum Teil horizontal verläuft,
    dadurch gekennzeichnet, dass die Lichtquelle allgemein die Form eines Zylinders hat, dessen Achse im Wesentlichen horizontal und zu einer optischen Achse (y-y) des Reflektors lotrecht ist und dessen Länge entlang dieser Achse deutlich geringer ist als die Breite des Reflektors, und dass wenigstens ein vertikaler Abschnitt (20h, 20b) der Reflektoroberfläche ein Profil derart aufweist, dass ein tangential von einem Rand der Lichtquelle emittierter Lichtstrahl (D1) parallel zu dieser optischen Achse reflektiert (D2) wird, wobei die vom übrigen Teil der Lichtquelle emittierten Lichtstrahlen bezogen auf die optische Achse nach unten geneigt reflektiert werden.
  2. Scheinwerfer nach Anspruch 1,
    dadurch gekennzeichnet, dass der Reflektor (20) eine Höhe aufweist, die mindestens seiner Breite entspricht.
  3. Scheinwerfer nach Anspruch 2,
    dadurch gekennzeichnet, dass das Verhältnis zwischen Höhe und Breite des Reflektors (20) zwischen 1,2:1 und 4:1 liegt.
  4. Scheinwerfer nach einem der Ansprüche 1 bis 3,
    dadurch gekennzeichnet, dass wenigstens ein Bereich der reflektierenden Oberfläche des Reflektors durch Verschieben des vertikalen Abschnitts entlang einer gegebenen horizontalen Erzeugenden erzeugt wird, die durch einen diesem Bereich entsprechenden Teil eines horizontalen Abschnitts des Reflektors auf Höhe der Lichtquelle gebildet ist.
  5. Scheinwerfer nach Anspruch 4,
    dadurch gekennzeichnet, dass das Verschieben des vertikalen Abschnitts eine Translationsbewegung ohne Drehung ist.
  6. Scheinwerfer nach einem der Ansprüche 4 oder 5,
    dadurch gekennzeichnet, dass die horizontale Erzeugende glatt ist.
  7. Scheinwerfer nach einem der Ansprüche 4 oder 5,
    dadurch gekennzeichnet, dass die horizontale Erzeugende Stufen aufweist.
  8. Scheinwerfer nach einem der Ansprüche 6 oder 7,
    dadurch gekennzeichnet, dass die horizontale Erzeugende wenigstens stellenweise die Form eines Parabelstücks aufweist.
  9. Scheinwerfer nach einem der Ansprüche 6 bis 8,
    dadurch gekennzeichnet, dass die horizontale Erzeugende wenigstens stellenweise die Form einer Geraden aufweist.
  10. Scheinwerfer nach einem der Ansprüche 1 bis 9,
    dadurch gekennzeichnet, dass der Reflektor in eine Vielzahl von Bereichen (211-219, 221-229) unterteilt ist, von denen wenigstens einer (215, 225) den vertikalen Abschnitt aufweist.
  11. Scheinwerfer nach Anspruch 10,
    dadurch gekennzeichnet, dass wenigstens einer der Bereiche des Reflektors einen vertikalen Abschnitt besitzt, der ein Profil derart aufweist, dass ein tangential von einer fiktiven Umrisslinie emittierter fiktiver Lichtstrahl (D1) parallel zur optischen Achse reflektiert (D2) wird, wobei die vom übrigen Teil der Umrisslinie emittierten fiktiven Lichtstrahlen bezogen auf die optische Achse nach unten geneigt reflektiert werden.
  12. Scheinwerfer nach Anspruch 11,
    dadurch gekennzeichnet, dass die fiktive Umrisslinie ein Zylinder ist, dessen Durchmesser sich von dem der Lichtquelle unterscheidet.
  13. Scheinwerfer nach Anspruch 12,
    dadurch gekennzeichnet, dass die fiktive Umrisslinie die Lichtquelle umschließt.
  14. Scheinwerfer nach einem der Ansprüche 1 bis 13,
    dadurch gekennzeichnet, dass die Lichtquelle (10) von einem Glühfaden gebildet ist.
  15. Scheinwerfer nach einem der Ansprüche 1 bis 14,
    dadurch gekennzeichnet, dass der Reflektor auf Höhe der Lichtquelle einen horizontalen Abschnitt aufweist, der eine vorbestimmte horizontale Lichtverteilung sicherzustellen vermag.
EP99400178A 1998-01-28 1999-01-26 Kfz-Scheinwerfer mit einer querliegenden Lichtquelle und zum Erzeugen von einer scharfen Lichtbegrenzung Expired - Lifetime EP0933585B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9800905 1998-01-28
FR9800905A FR2774150B1 (fr) 1998-01-28 1998-01-28 Projecteur a source transversale pour vehicule automobile, susceptilble d'emettre un faisceau a coupure nette

Publications (2)

Publication Number Publication Date
EP0933585A1 EP0933585A1 (de) 1999-08-04
EP0933585B1 true EP0933585B1 (de) 2008-01-09

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EP99400178A Expired - Lifetime EP0933585B1 (de) 1998-01-28 1999-01-26 Kfz-Scheinwerfer mit einer querliegenden Lichtquelle und zum Erzeugen von einer scharfen Lichtbegrenzung

Country Status (6)

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US (1) US6142658A (de)
EP (1) EP0933585B1 (de)
JP (1) JPH11265602A (de)
DE (1) DE69937917T2 (de)
ES (1) ES2300133T3 (de)
FR (1) FR2774150B1 (de)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2793000B1 (fr) * 1999-04-29 2001-08-03 Valeo Vision Projecteur bi-fonction a source unique et a optique fixe pour vehicule automobile
FR2804495B1 (fr) 2000-01-31 2002-06-07 Valeo Vision Projecteur de vehicule automobile, comportant une source transversale et apte a engendrer un faisceau a coupure non rectiligne
FR2808867B1 (fr) 2000-05-11 2002-08-23 Valeo Vision Projecteur bi-fonction a source lumineuse unique et occulteur mobile pour vehicule automobile
US6663570B2 (en) * 2002-02-27 2003-12-16 Volcano Therapeutics, Inc. Connector for interfacing intravascular sensors to a physiology monitor
FR2849159B1 (fr) 2002-12-24 2005-02-18 Valeo Vision Projecteur a source lumineuse transversale pour vehicule automobile
EP2009347A1 (de) 2003-06-27 2008-12-31 Valeo Vision Kfz-Scheinwerfer mit einem Spiegel und einem optischen Umlenkelement
FR2863342B1 (fr) * 2003-12-05 2007-01-05 Valeo Vision Projecteur verticalise pour vehicule automobile
FR2865021B1 (fr) * 2004-01-13 2007-03-16 Valeo Vision Projecteur verticalise pour vehicule automobile.
FR2877421B1 (fr) 2004-11-04 2007-04-13 Valeo Vision Sa Projecteur lumineux, pour vehicule automobile, donnant un faisceau a coupure
FR2881509B1 (fr) 2005-02-01 2007-03-16 Valeo Vision Sa Projecteur verticalise pour vehicule automobile
FR2883359B1 (fr) * 2005-03-15 2007-05-11 Valeo Vision Sa Projecteur lumineux pour vehicule automobile, de faible encombrement
DE102006004058B4 (de) * 2006-01-28 2019-10-24 Automotive Lighting Reutlingen Gmbh Beleuchtungseinrichtung für ein Fahrzeug und Verfahren sowie Werkzeug zur Herstellung derselben
JP5771887B2 (ja) * 2011-01-25 2015-09-02 スタンレー電気株式会社 フォグランプ

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US3354343A (en) * 1964-05-19 1967-11-21 Elman B Myers Dual beam electric lamp
FR2536502B1 (fr) 1982-11-19 1987-01-09 Cibie Projecteurs Projecteur de croisement pour vehicule automobile
FR2536503B1 (fr) 1982-11-19 1987-12-31 Cibie Projecteurs Projecteur antibrouillard pour vehicule automobile
DE3527391A1 (de) * 1985-07-31 1987-02-05 Bosch Gmbh Robert Nebelscheinwerfer fuer kraftfahrzeuge
DE3531223A1 (de) * 1985-08-31 1987-03-05 Bosch Gmbh Robert Scheinwerfer, insbesondere rechteckscheinwerfer, fuer abblendlicht von kraftfahrzeugen
FR2602305B1 (fr) 1986-08-04 1990-03-23 Cibie Projecteurs Projecteur antibrouillard a filament transversal pour vehicule automobile
FR2602306B1 (fr) 1986-08-04 1988-11-10 Cibie Projecteurs Projecteur croisement-route a deux filaments transversaux pour vehicule automobile
FR2609146B1 (fr) 1986-12-30 1990-01-05 Cibie Projecteurs Projecteur de vehicule automobile comportant un reflecteur parabolique a fond modifie
FR2609148B1 (fr) 1986-12-30 1991-07-12 Cibie Projecteurs Projecteur de vehicule automobile comportant un reflecteur a surface complexe a fond modifie
IT214875Z2 (it) * 1988-11-22 1990-07-04 Carello Spa Proiettore per autoveicoli
FR2639888B1 (fr) 1988-12-07 1993-08-13 Valeo Vision Projecteur de vehicule automobile, comportant un reflecteur a surface complexe a zones intermediaires modifiees
FR2664677A1 (fr) 1990-07-13 1992-01-17 Valeo Vision Reflecteur pour un dispositif d'eclairage de vehicule automobile, et projecteur et feu de signalisation incorporant un tel reflecteur.
SE9003423L (sv) * 1990-10-26 1992-04-27 Kjell Ljungstroem Reflektor
FR2710393B1 (fr) 1993-09-24 1995-12-15 Valeo Vision Projecteur à glace lisse, notamment pour véhicule automobile, et procédé de fabrication du réflecteur d'un tel projecteur.
WO1997006454A2 (en) * 1995-08-04 1997-02-20 Pang Teng Ong Process for producing the profile of reflectors for a cylindrical source of light and reflector obtained according to this process

Also Published As

Publication number Publication date
US6142658A (en) 2000-11-07
FR2774150A1 (fr) 1999-07-30
DE69937917T2 (de) 2009-01-02
FR2774150B1 (fr) 2000-04-14
ES2300133T3 (es) 2008-06-01
JPH11265602A (ja) 1999-09-28
EP0933585A1 (de) 1999-08-04
DE69937917D1 (de) 2008-02-21

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