EP0966633B1 - Kfz-scheinwerfer mit elliptischem reflektor - Google Patents

Kfz-scheinwerfer mit elliptischem reflektor Download PDF

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Publication number
EP0966633B1
EP0966633B1 EP99900505.1A EP99900505A EP0966633B1 EP 0966633 B1 EP0966633 B1 EP 0966633B1 EP 99900505 A EP99900505 A EP 99900505A EP 0966633 B1 EP0966633 B1 EP 0966633B1
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EP
European Patent Office
Prior art keywords
mirror
zones
headlight according
lfs
lens
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
EP99900505.1A
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English (en)
French (fr)
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EP0966633A1 (de
Inventor
Denis Saladin
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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Publication date
Application filed by Valeo Vision SAS filed Critical Valeo Vision SAS
Publication of EP0966633A1 publication Critical patent/EP0966633A1/de
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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

Definitions

  • the present invention generally relates to projectors of the elliptical genre for motor vehicles.
  • Such a projector generally comprises a mirror having a first focus area in the vicinity of which is located a light source and a second focus area in the vicinity of which the source radiation is reflected after reflection by the mirror.
  • a lens typically a convex planar spherical lens, is focused in the vicinity of the second focus area and projects this concentrated radiation onto the road.
  • optical elements stresss, prisms, etc.
  • lateral spreading of the light is substantially limited, such elements always being difficult to implement in a projector of the projection type of a lamp.
  • bright image that is a projector of the elliptical kind.
  • the document FR 2 704 044 describes such a modified mirror.
  • the mirror described in this document still has certain limitations.
  • the very nature of the mirror leads to a beam whose photometric study demonstrates that it is perfectible.
  • a satisfactory passing beam that is to say giving maximum visual comfort to the driver while complying with the regulations in force, must have a relatively sharp concentration spot in the axis of the road, slightly shifted laterally to the side (ie to the right for a direction of traffic on the right), and must also have a relatively uniform light over a certain width on both sides of the spot of concentration, with a relatively regular transition between the concentration spot and the spread light.
  • the mirror of the aforementioned type generally leads to a beam having a concentration zone of excessive width and corollary insufficient light intensity.
  • the beam may be of insufficient thickness, that is to say possess a high concentration of light just below the cut, but insufficiently illuminate the road closer to the vehicle.
  • the beams generated by projectors of the aforementioned type generally have a relatively small thickness, and in any case difficult to control, while it is rather desirable to have, at least in the case of a passing beam, a beam which has a substantial thickness towards the sides, and at the same time does not generate excess light in the axis of the vehicle and too close to it.
  • the present invention aims to overcome these limitations of the state of the art and to provide a projector of the aforementioned type, in which the beam obtained is improved.
  • Another object of the present invention is to give the designer a great flexibility in obtaining different characteristics of the beam, such as width and intensity of the concentration spot, evolution of the intensity towards the lateral edges of the beam.
  • Another object of the present invention is to provide a projector in which the thickness of the generated beam can be controlled more easily and with greater flexibility during the design.
  • the invention proposes a motor vehicle headlamp, of the type capable of generating a light beam of given configuration and comprising a light source, a mirror of the elliptical kind in the vicinity of a first focus of which the light source is located, a lens placed in front of the mirror, characterized in that the mirror comprises at least two zones situated side by side and capable of forming, in a focal region of the lens, light spots preformed in width, and in that the spots overlap each other in a direction horizontal.
  • FIG. 1 schematically shown elements of a projector according to the invention, which comprises a light source 10, a mirror 20, a screen or occultation mask 30 and a lens 40.
  • the source 10 is typically the filament of an incandescent lamp or the arc of a discharge lamp.
  • the mask 30 has for example, in a conventional manner per se, an upper edge defined by two line segments defining together in "V" inverted and flattened, so as to generate a beam of intersection according to European regulations in the field.
  • the lens 40 is for example a spherical plane / convex lens, with a point focus, or a toric lens.
  • the mirror is built according to principles similar to those described in the document FR 2 704 044 , to which reference will be made for more details, with respect to these principles differences as will be explained later.
  • the mirror consists of at least two zones individually constructed and connected in slightly bent transition lines generally extending from top to bottom.
  • a GH horizontal generator similar to that described in FR 2 704 044 , which is illustrated by the fact that a radius F1G emitted by the source in the direction of the reflecting surface of the zone to be built, at its horizontal generatrix, will be reflected in a radius GF2 which will cut a line of hearths LFS secondary at a point F2 whose position, or abscissa curvilinear on the line LFS varies depending on the angle ⁇ of the radius F1G relative to the optical axis xx.
  • a horizontal generator whose equation is given at the bottom of page 8 of the document FR 2 704 044 above.
  • the LFS line also controls the focus of the mirror section located in the vertical plane containing the reflected ray GF2.
  • the LFS line may be any curve, preferably without discontinuity so as to avoid discontinuities in the generated surface.
  • the whole of this section is able to focus the rays reflected by it on the point F2, whose distance, measured along the axis xx, with respect to the plane of the mask 30 may vary substantially along the LFS curve.
  • Each of these sections is therefore an elementary section of ellipsoid of revolution having as focal points F1 and F2, and the parameters of this ellipsoid vary as the point F2 moves along the LFS curve.
  • the profile of the above-mentioned LFS curve makes it possible to control not only the width of the light spot that will be formed in the mask plane 30, but also the thickness of this light spot, the latter being all the same. larger than the point F2 is distant ahead of the mask 30.
  • the figure 3 illustrates an alternative embodiment of certain vertical sections of the mirror 20, according to which a portion 20 'of the section illustrated in this figure has the same behavior as in the case of the figure 2 , that is to say concentrates the radiation reflected on the point F2, while an upper part 20 '' of this section will concentrate the radiation reflected at a point F2 'away from F2 forward, that is to say towards The lens. This also results in thickening at will the light spot in the plane of the mask 30, and therefore the thickness of the projected beam.
  • the mirror 20 is then defined by designing a first zone characterized by a certain LFS curve and a certain rule of evolution of the position. points F2 on this line as a function of the angle ⁇ of rays emitted by the source, and at least a second zone characterized by another rule of evolution of the position of the points F2, and if necessary by another line LFS whose trajectory is different from that corresponding to the first zone.
  • the rules for changing the positions of the points F2 between an area of the mirror and an adjacent area are such that there is a width-wise overlap between the radiation produced in the plane of the mask 30 by a zone and the radiation produced in this same plane by the adjacent zone.
  • This is done by designing the evolution rules of F2 points on the respective LFS lines of such that for respective predetermined fractions of the first and second zones which are adjacent to the transition between the two zones, the horizontal angular intervals covered by the radiation reflected by these zone portions overlap. It is easily understood that, in this way, there will exist at the boundary between these two areas a slight bend, that is to say a nondivability, between adjacent reflective surfaces.
  • the figure 4 schematically illustrates a first concrete embodiment of a mirror of a projector according to the invention, with two zones 20a and 20b designed as described above and which are separated by a transition edge 21 which extends substantially in the middle of the mirror.
  • the Figures 5a and 5b illustrate the beam portions projected by the lens 40 from the light spots formed respectively by these two areas, and with the intervention of the mask 30.
  • the beam portion generated by the zone 20a in combination with the mask 30 and the lens 40 extends substantially to the right with respect to the central vertical axis of the projection screen and that, in the opposite direction, the beam portion generated by the zone 20b in combination with the mask 30 and the lens 40 ( figure 5b ) extends substantially to the left of the central vertical axis of the screen.
  • this is achieved by giving the LFS curves of the two zones different axial positions in the vicinity of their portions affected by the rays reflected by regions of the zones 20a, 20b adjacent to the boundary 21, and determining the line 21 as the line of intersection between the two surfaces thus defined.
  • the two beam parts will merge into a global beam ( figure 6 ) which has excellent homogeneity, as well as a concentration in the axis which is both marked and at the same time gradually fuses with the wider parts of the beam.
  • the figure 7 illustrates a second embodiment of a projector mirror according to the invention. This time it comprises three zones, with two lateral zones 20a, 20b separated by a substantially narrower central zone.
  • the parameters used in the design of the individual surfaces are such that the two transition lines 21 and 22 between the adjacent zones do not correspond to horizontal isodeviation lines, so that the three corresponding beam portions, as illustrated in Figures 8a, 8b and 8c respectively, have side edges with progressive fading of the light. This results in a fusion of these beam portions to form a homogeneous overall beam, which has the same qualities as in the case of figure 6 , but with a higher level of central concentration.
  • a projector mirror according to the invention can be subdivided into as many areas as necessary, so as to be able to shape the beam according to the objectives in terms of photometry both in terms of regulation and comfort plan visual.
  • the invention applies to obtaining any type of beam, limited or not by a cut (the mask 30 being absent in the latter case).
  • the invention is fundamentally different from the case where two luminous spots formed by two different zones of the same reflector, for example ellipsoidal, overlap by virtue of the fact that the light source is not punctual, but is aimed at all the cases where the overlap between these luminous spots goes beyond the covering, moreover uncontrolled, which would be obtained with the conventional surfaces.

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

Claims (13)

  1. Kraftfahrzeugscheinwerfer von der Art, der ein Lichtbündel mit gegebener Form zu erzeugen vermag und eine Lichtquelle (10), einen Ellipsoidreflektor (20), in der Nähe eines ersten Brennpunkts desselben die Lichtquelle angeordnet ist, und eine vor dem Reflektor angeordnete Linse (40) umfasst,
    dadurch gekennzeichnet, dass der Reflektor wenigstens zwei Zonen (20a, 20b; 20a, 20b, 20c) aufweist, die nebeneinander liegen und in einem Brennweitenbereich der Linse in der Breite vorgeformte Lichtflecke zu bilden vermögen, und dass die Flecken sich horizontal gegenseitig überlappen.
  2. Scheinwerfer nach Anspruch 1,
    dadurch gekennzeichnet, dass jede Zone (20a, 20b; 20a, 20b, 20c) des Reflektors eine Fläche aufweist, die über eine horizontale Erzeugende (GH) verfügt, derart, dass die Strahlen (GF2), die sie ausgehend von den von der Lichtquelle (10) abgegebenen Strahlen (F1G) reflektiert, in vertikalen Ebenen verlaufen, die eine imaginäre Linie (LFS) in Punkten (F2) schneiden, deren gekrümmte Abszissen sich auf dieser Linie gemäß einem vorbestimmten Verlauf verändern.
  3. Scheinwerfer nach Anspruch 2,
    dadurch gekennzeichnet, dass die imaginären Linien (LFS) der verschiedenen Zonen stetig sind.
  4. Scheinwerfer nach Anspruch 2,
    dadurch gekennzeichnet, dass die imaginären Linien (LFS) der verschiedenen Zonen Kurven sind.
  5. Scheinwerfer nach Anspruch 4,
    dadurch gekennzeichnet, dass jede Kurve (LFS) von dem Brennweitenbereich der Linse in einer zur Achse (x-x) des Reflektors (20) parallelen Richtung umso weiter entfernt ist, je mehr die Kurve von der Achse seitlich entfernt ist.
  6. Scheinwerfer nach Anspruch 2,
    dadurch gekennzeichnet, dass in jeder Zone des Reflektors ein vertikales Segment des Reflektors, das in einer den von der horizontalen Erzeugenden (GH) reflektierten Strahl (F2) umfassenden vertikalen Ebene liegt, die auf den zugeordneten Punkt (F2) der imaginären Linie reflektierten Strahlen zu konzentrieren vermag, wobei die imaginäre Linie eine Linie sekundärer Brennpunkte (LFS) ist und die Punkte (F2) sekundäre Brennpunkte sind.
  7. Scheinwerfer nach Anspruch 6,
    dadurch gekennzeichnet, dass in wenigstens einem Teil einer der Zonen eine obere Region (20") eines vertikalen Segments die Strahlen zu konzentrieren vermag, die sie auf einen anderen Punkt (F2') reflektiert, der zwischen dem zugeordneten sekundären Brennpunkt (F2) und der Linse (40) liegt.
  8. Scheinwerfer nach Anspruch 6,
    dadurch gekennzeichnet, dass beidseits einer Übergangslinie (21; 21, 22) zwischen zwei nebeneinanderliegenden Zonen die vertikalen Segmente der Zonen sich nicht überlagernde Linien sekundärer Brennpunkte (LFS) aufweisen.
  9. Scheinwerfer nach Anspruch 8,
    dadurch gekennzeichnet, dass die Übergangslinie (21; 21, 22) durch den Schnittpunkt der Flächen dieser Zonen bestimmt ist, und dass die Übergangslinie sich von den entsprechenden Linien gleicher horizontaler Ablenkung dieser Zonen unterscheidet.
  10. Scheinwerfer nach Anspruch 1,
    dadurch gekennzeichnet, dass der Reflektor zwei Zonen (20a, 20b) aufweist, die durch eine Übergangslinie (21) voneinander getrennt sind, die im Wesentlichen in der Mitte des Reflektors horizontal verläuft.
  11. Scheinwerfer nach Anspruch 1,
    dadurch gekennzeichnet, dass der Reflektor drei Zonen (20a, 20b, 20c) aufweist, die durch zwei Übergangslinien (21, 22) voneinander getrennt sind, die beidseits der Achse (x-x) des Reflektors verlaufen.
  12. Scheinwerfer nach Anspruch 11,
    dadurch gekennzeichnet, dass eine Mittelzone (20c) des Reflektors horizontal deutlich schmäler ist als zwei Seitenbereiche (20a, 20b).
  13. Scheinwerfer nach Anspruch 1,
    dadurch gekennzeichnet, dass er ferner eine Blende (30) umfasst, die im Brennweitenbereich der Linse (40) solchermaßen angeordnet ist, dass ein Lichtbündel mit Hell-Dunkel-Grenze erzeugt wird.
EP99900505.1A 1998-01-09 1999-01-08 Kfz-scheinwerfer mit elliptischem reflektor Expired - Lifetime EP0966633B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9800339 1998-01-09
FR9800339A FR2773604B1 (fr) 1998-01-09 1998-01-09 Projecteur du genre elliptique pour vehicule automobile
PCT/FR1999/000020 WO1999035438A1 (fr) 1998-01-09 1999-01-08 Projecteur du genre elliptique pour vehicule automobile

Publications (2)

Publication Number Publication Date
EP0966633A1 EP0966633A1 (de) 1999-12-29
EP0966633B1 true EP0966633B1 (de) 2016-05-18

Family

ID=9521781

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99900505.1A Expired - Lifetime EP0966633B1 (de) 1998-01-09 1999-01-08 Kfz-scheinwerfer mit elliptischem reflektor

Country Status (6)

Country Link
US (1) US6431736B1 (de)
EP (1) EP0966633B1 (de)
JP (1) JP2001515649A (de)
ES (1) ES2587134T3 (de)
FR (1) FR2773604B1 (de)
WO (1) WO1999035438A1 (de)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2802282B1 (fr) 1999-12-09 2002-01-25 Valeo Vision Procede d'elaboration d'un masque pour adapter un faisceau de projecteur de croisement a un sens de circulation inverse
FR2809798B1 (fr) 2000-05-31 2002-11-29 Valeo Vision Procede pour adapter un faisceau de croisement de projecteur elliptique a un sens de circulation inverse, dispositif, gabarit et projecteur pour la mise en oeuvre de ce procede
FR2810934B1 (fr) 2000-07-03 2002-09-13 Valeo Vision Projecteur elliptique a modification de faisceau par mouvement d'elements optiques
FR2822550B1 (fr) 2001-03-21 2003-05-16 Valeo Vision Projecteur de vehicule automobile a miroir et element de deviation conjugues
FR2843184B1 (fr) 2002-08-05 2004-11-26 Valeo Vision Projecteur d'eclairage elliptique convenant a la realisation d'un faisceau de virage
FR2883359B1 (fr) * 2005-03-15 2007-05-11 Valeo Vision Sa Projecteur lumineux pour vehicule automobile, de faible encombrement
JP4506720B2 (ja) * 2006-05-17 2010-07-21 市光工業株式会社 車両用前照灯
WO2009092451A1 (de) * 2008-01-25 2009-07-30 Osram Gesellschaft mit beschränkter Haftung Wechselspannungsreflektorlampe
FR3065088B1 (fr) * 2017-04-11 2022-12-02 Valeo Vision Ensemble optique comprenant des reflecteurs munis de discontinuites

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE373617A (de) 1929-09-24
US4825343A (en) * 1985-12-27 1989-04-25 Ichikoh Industries Limited Projector type headlamp for vehicles
JPS62180568A (ja) * 1986-02-04 1987-08-07 Sony Corp デイスク状記録媒体の欠陥検出装置
JPH07118210B2 (ja) 1988-04-01 1995-12-18 三菱電機株式会社 天井設備装置
JPH01255103A (ja) * 1988-04-05 1989-10-12 Koito Mfg Co Ltd 車輌用灯具
FR2704044B1 (fr) 1993-04-15 1995-07-13 Valeo Vision Projecteur du genre elliptique pour vehicule automobile.
JP2696745B2 (ja) * 1994-05-31 1998-01-14 スタンレー電気株式会社 プロジェクタ型前照灯

Also Published As

Publication number Publication date
JP2001515649A (ja) 2001-09-18
FR2773604A1 (fr) 1999-07-16
EP0966633A1 (de) 1999-12-29
WO1999035438A1 (fr) 1999-07-15
ES2587134T3 (es) 2016-10-20
FR2773604B1 (fr) 2000-03-31
US6431736B1 (en) 2002-08-13

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