EP0256930B1 - Nebelscheinwerfer für Kraftfahrzeuge mit einer Transversalwendel - Google Patents

Nebelscheinwerfer für Kraftfahrzeuge mit einer Transversalwendel Download PDF

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Publication number
EP0256930B1
EP0256930B1 EP87401810A EP87401810A EP0256930B1 EP 0256930 B1 EP0256930 B1 EP 0256930B1 EP 87401810 A EP87401810 A EP 87401810A EP 87401810 A EP87401810 A EP 87401810A EP 0256930 B1 EP0256930 B1 EP 0256930B1
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EP
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Prior art keywords
filament
reflector
axis
horizontal
cut
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Expired - Lifetime
Application number
EP87401810A
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English (en)
French (fr)
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EP0256930A1 (de
Inventor
Bernard Luciani
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Valeo Vision SAS
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Valeo Vision SAS
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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
    • F21S41/323—Optical layout thereof the reflector having two perpendicular cross sections having regular geometrical curves of a distinct nature
    • 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 to a headlight for a motor vehicle, making it possible to fulfill the fog light function.
  • the beam corresponding to such an illumination is a short-range beam, limited upwards by a substantially horizontal cutting plane, very spread out laterally and not comprising rising rays capable of giving rise to undesirable optical phenomena with the droplets of water in mist suspension.
  • the fog lights of the prior art mostly have an axially oriented filament, that is to say in the axis of the projector.
  • the first consists of providing a reflector in the form of a paraboloid of revolution, the focus of which is located at the front end of the filament (in the direction of emission). A slightly divergent beam is thus obtained, the spokes of the upper half of which are folded down by means of deflecting elements provided on the closing glass.
  • the reflector has a surface discontinuity at the point of connection between the two half-paraboloids: these, focused at different points, necessarily have either different vertices, or different focal distances, and by suite have different profiles along a connection plane; because of this characteristic, a reflector manufactured according to these teachings is, in practice, imperfect at the connection, which results in an emission of parasitic light rays above the cut.
  • the beam generated by the lower half-paraboloid is spread laterally in a satisfactory manner only in the zone situated just below the cut. This non-uniform spreading of the beam goes against the aim sought in a fog beam, which is to obtain a relatively uniform lateral spreading.
  • an axial filament with a reflector of this type necessarily causes the appearance of filament images which are large and oriented vertically, or with a slight inclination relative to the vertical. Such images must be subject to significant lateral spreading, and this must be done on the closing glass with appropriate prisms or streaks.
  • a second disadvantage of this type of projector is that, still due to the existence of these vertical images, the beam has a greater thickness than that which is required in practice, the lower part of it not contributing to comfort. visual, and can even be annoying by lighting the road too close to the vehicle.
  • fog lamps comprising a horizontal filament lamp transverse to the axis of the projector, associated with a reflector in the form of a paraboloid of revolution, the focus of which is located in the center of the filament.
  • the beam does not include large images of the filament, but in certain cases it remains necessary to effect, by prisms formed on the closing glass, a folding of the images in the vertical direction, with a risk of emission. of parasitic rays upwards at the spoils of these prisms.
  • the present invention aims to overcome the drawbacks of the prior art and to propose a fog light in which none, or essentially no vertical deflection of the light rays has to be carried out by the closing glass, and in which the beam obtained is of 'a good homogeneity in its width as in its height.
  • the invention relates to a fog light for a motor vehicle, of the type comprising a transverse horizontal filament lamp, a reflector whose axis passes directly above the center of the filament, and a closing glass, characterized in that that the surface of the reflector is a surface without discontinuity which by itself forms images of the filament, all the points of which are situated below a horizontal cut and in a horizontal band of great width and, of height es substantially constant located under said cut, so that the ice can be smooth or only slightly deviating.
  • the fog lamp of the invention shown diagrammatically in FIGS. 2 and 3, comprises a lamp (not shown) provided with a filament 10, a reflector 20 and a distribution glass 30 closing the projector.
  • the filament is placed in a horizontal plane and oriented transversely to the axis Ox of the reflector, more precisely, in the present example, the filament, modeled in the form of a cylinder of length 2 2 and of radius r, is shifted towards the top with respect to the horizontal plane xOy by a distance equal to its radius, so that its emissive surface is tangent to said plane. It is also arranged, in the direction y'Oy, so that its center is perpendicular to a point Fo located on the axis Ox. The distance from the top of the reflector to this point F o is denoted f o .
  • the position of the filament may vary slightly from the position indicated above, without departing from the scope of the invention.
  • the surface of the reflector is a surface without discontinuity, chosen so as to form the images of the filament, all the points of which are situated below a horizontal cut passing through the axis of the projector (denoted h ′ Hh in FIGS. 4a, 4b, and 5), and in a horizontal band of essentially constant height delimited at the top by said cut.
  • all of these images have their highest point situated on the cut, or in the very close vicinity thereof.
  • absence of discontinuity is meant continuity guaranteed at the first order at any point on the surface of the reflector, and at the second order at any point on the surface with the exception of two localized defects as explained below, manifested by very slight breaks in the curve.
  • a second order continuity means that at any point of a line drawn on the surface, the tangent planes are the same on both sides of this line.
  • FIG. 1 represents the distribution of the images for a reflector projector with a complex surface without discontinuity associated with an axial filament.
  • the distribution of the images below the cut, in particular in the horizontal direction is here of very good uniformity, more precisely, it can be observed that the images of the filament, progressively that they rotate around their center from horizontal to vertical, see their length progressively reduced.
  • FIG. 5 which represents, by a series of isocandela curves C of decreasing values from the inside towards the outside, the illumination provided by the whole of the reflector, one can observe the sharpness of the upper horizontal cut h ' Hh, the large beam width with a practically constant thickness, and the concentration point P located below the cut h 'Hh and centered on the vertical v' Hv.
  • the closing glass can optionally provide additional lateral spreading of the beam.
  • additional lateral spreading of the beam is already obtained by the very nature of the reflector, and there will be no need to provide significant extra thicknesses on the closing glass: it will therefore be easy to mold, whether made of glass or made of plastic.
  • Figure 6a shows, in schematic front view without closing glass, a projector whose reflector has a width yi approximately equal to twice its height zi.
  • FIG. 6b these proportions have been reversed, the height z 2 being approximately equal to twice the width y 2 .
  • These values are determined so that the surfaces ef the total reflectance of the two reflectors are approximately identical.
  • the luminous flux (in lumens) obtained was measured as a function of the inclination (in degrees) at which one places oneself below the cut-off.
  • FIG. 7 represents the curves $ 1 and ⁇ 2 obtained respectively with the projectors of FIGS. 6a and 6b.
  • the filament is located at a distance z 3 below the upper edge of the reflector, a distance which is approximately one tenth of the total height z 2 of the reflector, and in FIG. 8b, the filament is a distance Z4 , substantially equal to z 3 , above the lower edge of the reflector.
  • the surfaces of the two reflectors are equal.
  • the invention can be implemented with any contours of reflectors and any filament / reflector positions in a given contour, the height of the headlamp can advantageously be increased as far as possible, to the detriment of its width, and shift the lamp upwards.

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

Claims (7)

1. Nebelscheinwerfer für ein Kraftfahrzeug, von der Art, die eine Quer-Horizontalfadenlampe (10), einen Reflektor (20), dessen Achse (Ox) lotrecht zur Fadenmitte verläuft, und eine Verschlußscheibe (30) enthält, dadurch gekennzeichnet, daß die Reflektorfläche eine Fläche ohne Unstetigkeit ist, die als solche Fadenbilder erzeugt, deren Punkte alle unterhalb einer horizontalen Schnittlinie (h'Hh) und in einem horizontalen Streifen großer Breite und im wesentlichen konstanter Höhe unter der genannten Schnittlinie liegen, so daß die Scheibe (30) glatt oder nur geringfügig abweichend sein kann.
2. Scheinwerfer nach Anspruch 1, dadurch gekennzeichnet, daß die Fadenbilder, die durch den Reflektor (20) erzeugt werden, alle am höchsten Punkt mit der genannten horizontalen Schnittlinie (h'Hh) fluchten.
3. Scheinwerfer nach Anspruch 2, dadurch gekennzeichnet, daß der Faden um einen solchen Abstand nach oben verschoben ist, daß seine Oberfläche im wesentlichen tangential zur horizontalen Ebene (xOy) liegt, die durch die Achse des Reflektors (Ox) verläuft.
4. Scheinwerfer nach Anspruch 3, dadurch gekennzeichnet, daß die Oberfläche des Reflektors (20) durch die Gleichung definiert wird:
Figure imgb0007
worin
x, y, z = kartesische Koordinaten, Achse Ox gleich Scheinwerferachse, r = Fadenhalbmesser (10), = halbe Fadenlänge, fo = Abstand der Fadenachse von der Ebene yOz.
5. Scheinwerfer nach Anspruch 3, dadurch gekennzeichnet, daß die Oberfläche des Reflektors (20) definiert ist durch die Gleichung:
Figure imgb0008
worin
x, y, z = kartesische Koordinaten, Achse Ox gleich Scheinwerferachse, é = halbe Fadenlänge (10), fo = Abstand der Fadenachse von der Ebene yOz. -
6. Scheinwerfer nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Lampe im Verhältnis zur Mitte der Reflektoröffnung nach oben versetzt ist.
7. Scheinwerfer nach einem der vorherigen Ansprüche, wobei der Reflektor an wenigstens zwei der vier Seiten durch flache Wangen (21, 22) abgestumpft ist, dadurch gekennzeichnet, daß die Oberfläche dieser Wangen eine nichtreflektierende Fläche ist.
EP87401810A 1986-08-04 1987-08-04 Nebelscheinwerfer für Kraftfahrzeuge mit einer Transversalwendel Expired - Lifetime EP0256930B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8611263 1986-08-04
FR8611263A FR2602305B1 (fr) 1986-08-04 1986-08-04 Projecteur antibrouillard a filament transversal pour vehicule automobile

Publications (2)

Publication Number Publication Date
EP0256930A1 EP0256930A1 (de) 1988-02-24
EP0256930B1 true EP0256930B1 (de) 1990-12-19

Family

ID=9338006

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87401810A Expired - Lifetime EP0256930B1 (de) 1986-08-04 1987-08-04 Nebelscheinwerfer für Kraftfahrzeuge mit einer Transversalwendel

Country Status (6)

Country Link
US (1) US4827367A (de)
EP (1) EP0256930B1 (de)
JP (1) JP2631980B2 (de)
DD (1) DD261400A5 (de)
DE (1) DE3766774D1 (de)
FR (1) FR2602305B1 (de)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2642145B1 (fr) * 1989-01-23 1993-04-09 Valeo Vision Projecteur de vehicule automobile comportant une source lumineuse unique et engendrant deux faisceaux differents
DE3930746A1 (de) * 1989-09-14 1991-03-28 Hella Kg Hueck & Co Scheinwerfer, insbesondere fuer kraftfahrzeuge
FR2664363B1 (fr) * 1990-07-03 1992-12-31 Valeo Vision Projecteur a plusieurs fonctions, en particulier pour vehicule automobile, adapte a ameliorer l'eclairement d'elements de signalisation routiere.
DE4225370B4 (de) * 1992-07-31 2004-02-05 Robert Bosch Gmbh Nebelscheinwerfer für Fahrzeuge
GB2284658B (en) * 1993-12-09 1997-07-16 Koito Mfg Co Ltd Headlamp for an automobile
ES2295264T3 (es) 1996-12-16 2008-04-16 Valeo Vision Faro de vehiculo automovil equipado con medios de reflector perfeccionados.
FR2767904B1 (fr) * 1997-09-03 1999-11-26 Valeo Vision Miroir de projecteur de vehicule automobile pour virages, et projecteur l'incorporant
FR2776366B1 (fr) 1998-03-19 2000-06-30 Valeo Vision Projecteur de virage pour vehicule automobile, susceptible d'emettre des faisceaux differents
FR2769687B1 (fr) 1997-10-13 2000-03-03 Valeo Vision Ensemble de projecteurs gauche et droit de vehicule automobile, a proprietes photometriques ameliorees
FR2774150B1 (fr) * 1998-01-28 2000-04-14 Valeo Vision Projecteur a source transversale pour vehicule automobile, susceptilble d'emettre un faisceau a coupure nette
FR2774149B1 (fr) 1998-01-28 2000-04-14 Valeo Vision Projecteur de vehicule automobile, comportant une source transversale et apte a engendrer un faisceau a coupure non rectiligne
FR2774151B1 (fr) 1998-01-28 2000-04-14 Valeo Vision Projecteur de vehicule automobile a source lumineuse virtuelle
FR2775057B1 (fr) 1998-02-17 2000-05-05 Valeo Vision Projecteur a source transversale pour vehicule automobile, avec un moyen d'occultation de la lumiere directe
FR2775640B1 (fr) 1998-03-04 2000-05-26 Valeo Vision Projecteur de vehicule automobile a miroir dote d'au moins une joue laterale
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
FR2819042B1 (fr) 2000-12-28 2003-03-14 Valeo Vision Projecteur pour vehicule, comprenant un reflecteur et une source lumineuse horizontale orientee transversalement a un axe optique du reflecteur
FR2837908B1 (fr) 2002-03-28 2004-06-11 Valeo Vision Projecteur d'eclairage equipe d'un reflecteur elliptique pivotant et d'une lentille fixe pour la realisation d'un faisceau de virage
FR2877421B1 (fr) * 2004-11-04 2007-04-13 Valeo Vision Sa Projecteur lumineux, pour vehicule automobile, donnant un faisceau a coupure
FR2883359B1 (fr) * 2005-03-15 2007-05-11 Valeo Vision Sa Projecteur lumineux pour vehicule automobile, de faible encombrement

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1898167A (en) 1930-05-06 1933-02-21 Ivan L Bean Reflector
FR1319105A (fr) * 1961-04-04 1963-02-22 Philips Nv Projecteur pour véhicules à moteur
FR1309130A (fr) * 1962-01-05 1962-11-09 Philips Nv Phare d'automobile
US4246631A (en) * 1978-05-23 1981-01-20 Lucas Industries Limited Vehicle headlamp
US4303965A (en) * 1978-10-16 1981-12-01 Westinghouse Electric Corp. Single-mode vehicular headlamp system
US4520433A (en) * 1982-06-09 1985-05-28 General Electric Company Motor vehicle headlamp
JPS5931702U (ja) * 1982-08-24 1984-02-28 市光工業株式会社 車輌用補助灯
FR2536503B1 (fr) * 1982-11-19 1987-12-31 Cibie Projecteurs Projecteur antibrouillard pour vehicule automobile
FR2566878B1 (fr) * 1984-06-27 1986-07-18 Cibie Projecteurs Perfectionnements aux projecteurs automobiles emettant un faisceau coupe, notamment un faisceau de croisement
DE3515493A1 (de) * 1985-04-30 1986-10-30 Robert Bosch Gmbh, 7000 Stuttgart Scheinwerfer fuer abblendlicht oder nebellicht von kraftfahrzeugen

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Publication number Publication date
DD261400A5 (de) 1988-10-26
JP2631980B2 (ja) 1997-07-16
DE3766774D1 (de) 1991-01-31
FR2602305A1 (fr) 1988-02-05
US4827367A (en) 1989-05-02
FR2602305B1 (fr) 1990-03-23
EP0256930A1 (de) 1988-02-24
JPS6343201A (ja) 1988-02-24

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