EP0250284B1 - Abblendlichtscheinwerfer ohne Abblendkappe und mit versetzter Konzentration - Google Patents

Abblendlichtscheinwerfer ohne Abblendkappe und mit versetzter Konzentration Download PDF

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Publication number
EP0250284B1
EP0250284B1 EP87401169A EP87401169A EP0250284B1 EP 0250284 B1 EP0250284 B1 EP 0250284B1 EP 87401169 A EP87401169 A EP 87401169A EP 87401169 A EP87401169 A EP 87401169A EP 0250284 B1 EP0250284 B1 EP 0250284B1
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EP
European Patent Office
Prior art keywords
filament
sectors
dipped
plane
paraboloidal
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Expired - Lifetime
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EP87401169A
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English (en)
French (fr)
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EP0250284A1 (de
Inventor
Norbert Brun
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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
    • F21S41/33—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

Definitions

  • the present invention relates to a motor vehicle headlamp intended to form a passing beam.
  • a passing beam is characterized by a cut, that is to say by a generally horizontal orientation limit above which no light ray must be emitted.
  • Figure 1 of the accompanying drawings is shown, by a front view of a screen standardized to 25 meters, the cutout which must be specifically adopted in a number of countries, especially in Europe.
  • This cut-off is made up, for a right-hand traffic direction, by a horizontal half-plane h 'H extending to the left from the longitudinal horizontal axis of the vehicle, and by a half-plane Hc extending towards the straight line of this same axis being slightly inclined upwards, typically by an angle a equal to 15 degrees.
  • this configuration is reversed for left-hand traffic.
  • the concentration spot that is to say the region of the illumination field in which the light concentration must be maximum, should preferably be located slightly to the right with respect to the central vertical axis v '-v passing through the median longitudinal plane of the vehicle, and just below the cut, in order to properly illuminate the aisle.
  • This concentration is determined in particular by measuring the luminous flux at points 75R and 50R, which flux must be greater than a minimum authorized value.
  • the desired concentration of the beam such as defined above is now easily obtained thanks to very specific optical characteristics of the reflector and of the glass.
  • the two sectors in the form of paraboloids have the same focal point, located axially above the center of the filament, and the same focal distance.
  • the main advantage of such a projector is a considerable increase in the output luminous flux, due to the elimination of the obscuring cup.
  • FIG. 2 of the appended drawings which represents the isocandela curves Ci of the illumination produced by such a projector of the prior art on a screen standardized to 25 meters
  • the concentration spot obtained with this projector (hatched area T) is essentially centered on the longitudinal axis of the vehicle.
  • Such positioning has two major drawbacks.
  • such a spot of central concentration is extremely sensitive to the vertical oscillations of the vehicle.
  • there are very marked differences in lighting in the axis of the road which leads to visual discomfort, which generates fatigue, for the driver.
  • the optimization of the visibility distance given by a low beam projector leads to superimposing the concentration spot on point 75R of the European regulations, that is to say a shift of said spot to the right and upwards.
  • the solution which would consist in shifting this spot of concentration to the right and upwards using deflecting prisms or the like on the lens of the projector is difficult to implement in practice, because it results in degradation. sensitive to the cut, and to a certain risk of an increase in the rising radii, therefore dazzling for vehicles coming opposite, due to the inevitable inaccuracies in the production of the closing glass by molding.
  • the present invention aims to provide an improvement to a dipped headlamp without cup, thanks to which one obtains, in addition to a completely satisfactory cut-off, a concentration of the light beam correctly shifted to the right with respect to the central longitudinal axis of the vehicle.
  • It includes a lamp provided with an axial filament 100, a reflector 200 and a distribution glass 300 closing the projector at the front thereof.
  • the filament 100 which can be schematized by a cylinder of length 2.e and of radius r, is here shifted upwards by a distance equal to its radius r with respect to the optical axis Ox of the projector. In this way, the emissive surface of the filament is essentially tangent to said axis Ox.
  • the planes xOy and xOs define between them two sectors 201 and 202 which are each in the form of a paraboloid. More precisely, the focal point of the first parabolic sector 201 is indicated at F i in FIGS. 3 and 5, and is located near the rear axial end of the filament. The focal point F 2 of the second parabolic sector 202 is located close to the other end of the filament. The corresponding focal distances f 1 and f 2 are determined so that these focal points F 1 and F 2 are located, on either side of the center Fo of the filament in the axial direction, at equal distance from the latter, as will be seen. in detail later.
  • the images from zones 201 and 202 of the reflector being suitably positioned to create in part the desired beam, as regards both the concentration spot and the inclined cut, it is not necessary to make intervene important corrective optical elements on the closing glass 300 of the projector to deflect the light rays.
  • the homologous ice zones of zones 201 and 202 will therefore be non-deviating or slightly deviating.
  • the other sectors 203 to 206 of the reflector are used according to the invention, on the one hand to reinforce the intensity of the beam, and on the other hand to better define the cut-off h'H in the left half-plane.
  • these sectors are determined so that the images of the filament they form all have their highest point located on the cut h'Hc, or at least in the very close vicinity of this one.
  • these zones 203 to 206 are constituted by deflecting surfaces which ensure with second order continuity the transition between the sectors 201 and 202 in the form of paraboloids of different foci, respectively in the upper region and in the lower region of the reflector.
  • the paraboloidal zones 201 and 202 of different foci have the equation: or
  • fo is therefore the average of the focal lengths of the respective sectors 201 and 202.
  • the images of the filament 100 will be shifted to the right by both the sector 201 and by the sector 202, to initiate the cut inclined along Hc, as shown in FIG. 6.
  • the value of the latter will be chosen so that the concentration spot thus determined is substantially superimposed with the point "75R" of European regulations.
  • Zones 203 and 204 are determined by the following equation: with the constants, parameters and variables being the same as above.
  • the areas 205 and 206 have the equation: the constants, parameters and variables being as above, and the angle having in the present example a value of 15 ° , that is to say the angle of the half-plane Hc of the cut on the right with respect to the horizontal h'- h.
  • this equation (3) is deduced from equation (2) indicated above by a change of coordinates corresponding to a rotation of the angle a around the axis Ox.
  • the images P 56 of the reflecting surfaces 205 and 206 mainly define the inclined cut-off Hc of the straight part of the beam, by extending the cut already started at the concentration spot by the areas 201 and 202 .
  • surface 201 is a focal length paraboloid
  • Equation (3) therefore becomes: with either a hearth dish
  • the fictitious trace of the surface 206 extended in the same way is determined beyond the separation plane xOt, up to the plane xOu perpendicular to the plane xOs.
  • this defect will be mitigated during the machining and polishing steps of the reflector or its mold, until it disappears and does not cause any apparent defect in the projected light.
  • such a reflector will be used with a lens intended to improve the distribution of the beam, and in particular to effect horizontal spreading.
  • the homologous ice zones of sectors 201 and 202 of the reflector which mainly participate in the creation and well-determined positioning of the concentration spot, will be smooth or slightly deviating.
  • the glass 300 closing the headlamp will be designed so as not to effect substantially any vertical deflection, so as not to degrade the satisfactory cut obtained by the specific design of the reflector, and in particular not to increase the dazzling illumination. at standard point B50 (see Figure 1).
  • the present invention is in no way limited to the embodiment described above, but includes any variant in accordance with its spirit.

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

Claims (6)

1. Abblendscheinwerfer für ein Kraftfahrzeug, enthaltend:
- einen Reflektor (200) mit zwei Paraboloidsektoren (201, 102) zur Drehung um eine gemeinsame Achse, die im Verhältnis zur genannten Achse symmetrisch angeordnet sind und von zwei axialen Ebenen begrenzt werden, einer horizontalen Ebene und einer anderen Ebene, die mit letzterer einen Winkel bildet, der dem gemessenen Winkel (a) des Ausschnitts (h'Hc) des Abblend-Lichtbündels entspricht,
- eine Lampe mit Axialfaden (100), der in radialer Richtung zur genannten Achse nach oben versetzt ist und
- eine Verteilungsscheibe (300), angeordnet vor dem Reflektor, deren Zonen, die den beiden Paraboloidsektoren homolog sind, nicht oder nur geringfügig abweichen, dadurch gekennzeichnet, daß:
- die beiden Paraboloidsektoren (201, 202) unterschiedliche Brennweiten (fi, f2) aufweisen, wobei sich die Brennpunkte jeweils axial beiderseits der Fadenmitte befinden und
- der Reflektor reflektierende Oberflächen (203, 204, 205, 206) aufweist, die sich über die genannten axialen Ebenen hinaus erstrecken und ohne Unterbrechung die Verbindung zwischen den beiden Paraboloidsektoren mit unterschiedlichen Brennpunkten herstellen, die unterhalb des genannten Ausschnitts die Bilder des reflektierten Fadens wiedergeben.
2. Abblendscheinwerfer nach Anspruch 1, dadurch gekennzeichnet, daß die Brennpunkte (F1, F2) der beiden Paraboloidsektoren (201, 202) in axialer Richtung im gleichen Abstand von der Mitte (Fo) des Fadens und auf beiden Seiten desselben angeordnet sind.
3. Abblendscheinwerfer nach Anspruch 2, dadurch gekennzeichnet, daß die Brennpunkte (F1, F2) der beiden Paraboloidsektoren (201, 202) in axialer Richtung in einem Abstand von der Mitte (Fo) des unteren Fadens auf halber Länge (2i) des Fadens (100) angeordnet sind.
4. Abblendscheinwerfer nach Anspruch 3, dadurch gekennzeichnet, daß die beiden Paraboloidsektoren (201, 202) durch die Gleichung definiert werden: wobei
Figure imgb0039
und daß die reflektierenden Oberflächen durch die Gleichungen definiert sind:
Figure imgb0040
 wobei
Figure imgb0041
und
Figure imgb0042
und
Figure imgb0043
worin fo eine imaginäre Brennweite ist, die einem Brennpunkt entspricht, der axial in der Fadenmitte liegt,
II die halbe Fadenlänge ist
r der Fadenhalbmesser ist
n eine Konstante ist, die in dem Intervall (1, + ∞) gewählt wurde, und x, y, z orthogonale kartesische Koordinaten sind und die Ebene x-y horizontal verläuft.
5. Abblendscheinwerfer nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Winkel (a), der die beiden axialen Ebenen zur Begrenzung der Paraboloidsektoren (201, 202) trennt, etwa 15° beträgt.
6. Abblendscheinwerfer nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Faden (100) im Verhältnis zur genannten Achse nach oben um einen Abstand versetzt ist, der dem Halbmesser (r) entspricht.
EP87401169A 1986-05-26 1987-05-25 Abblendlichtscheinwerfer ohne Abblendkappe und mit versetzter Konzentration Expired - Lifetime EP0250284B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8607462A FR2599121B1 (fr) 1986-05-26 1986-05-26 Projecteur de croisement sans coupelle a concentration decalee
FR8607462 1986-05-26

Publications (2)

Publication Number Publication Date
EP0250284A1 EP0250284A1 (de) 1987-12-23
EP0250284B1 true EP0250284B1 (de) 1990-04-04

Family

ID=9335599

Family Applications (1)

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EP87401169A Expired - Lifetime EP0250284B1 (de) 1986-05-26 1987-05-25 Abblendlichtscheinwerfer ohne Abblendkappe und mit versetzter Konzentration

Country Status (7)

Country Link
US (1) US4772988A (de)
EP (1) EP0250284B1 (de)
JP (1) JPH0668922B2 (de)
BR (1) BR8702675A (de)
DE (1) DE3762161D1 (de)
FR (1) FR2599121B1 (de)
SU (1) SU1542425A3 (de)

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3731232A1 (de) * 1987-09-17 1989-03-30 Bosch Gmbh Robert Scheinwerfer fuer fahrzeuge, insbesondere scheinwerfer fuer kraftfahrzeuge
DE3808086A1 (de) * 1988-03-11 1989-09-28 Hella Kg Hueck & Co Reflektor fuer abgeblendete oder abblendbare kraftfahrzeugscheinwerfer
JPH0658761B2 (ja) * 1988-11-08 1994-08-03 株式会社小糸製作所 前照灯用反射鏡
FR2639888B1 (fr) * 1988-12-07 1993-08-13 Valeo Vision Projecteur de vehicule automobile, comportant un reflecteur a surface complexe a zones intermediaires modifiees
JPH0368305U (de) * 1989-11-02 1991-07-04
US5136007A (en) * 1989-12-08 1992-08-04 The B. F. Goodrich Company High char yield silazane derived preceramic polymers and cured compositions thereof
JP2517485B2 (ja) * 1991-01-23 1996-07-24 株式会社小糸製作所 車輌用前照灯の反射鏡
JP2610546B2 (ja) * 1991-01-25 1997-05-14 株式会社小糸製作所 車輌用前照灯の反射鏡
JP2668306B2 (ja) * 1992-02-04 1997-10-27 株式会社小糸製作所 車輌用前照灯の反射鏡
DE4206881A1 (de) * 1992-03-05 1993-09-09 Bosch Gmbh Robert Abblendlichtscheinwerfer fuer kraftfahrzeuge
JP2626864B2 (ja) * 1992-12-25 1997-07-02 株式会社小糸製作所 車輌用前照灯の反射鏡
JP2764369B2 (ja) * 1993-07-26 1998-06-11 株式会社小糸製作所 車輌用前照灯の反射鏡
US5515255A (en) * 1994-11-14 1996-05-07 Sterner Lighting Systems Incorporated Lamp reflector
JP3202155B2 (ja) * 1995-10-18 2001-08-27 株式会社小糸製作所 車輌用灯具の反射鏡及びその形成方法
JP3145910B2 (ja) * 1995-11-02 2001-03-12 株式会社小糸製作所 車輌用前照灯
FR2740858B1 (fr) 1995-11-08 1998-01-23 Valeo Vision Projecteur de vehicule automobile, comportant un miroir capable d'engendrer par lui-meme un faisceau a coupure en v
CZ287690B6 (cs) * 1996-01-29 2001-01-17 Autopal S. R. O. Světlomet s komplexním reflektorem
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
FR2794845B1 (fr) 1999-06-08 2001-08-17 Valeo Vision Projecteur equipe d'une lampe a double source, notamment projecteur croisement route pour vehicule automobile
JP3926957B2 (ja) * 1999-12-09 2007-06-06 株式会社小糸製作所 車輌用前照灯及びその反射鏡の形成方法
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
FR2822113B1 (fr) * 2001-03-14 2003-05-02 Valeo Vision Agencement d'un dispositif d'eclairage dans un vehicule automobile
FR2822550B1 (fr) * 2001-03-21 2003-05-16 Valeo Vision Projecteur de vehicule automobile a miroir et element de deviation conjugues

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1400370A (fr) * 1963-06-17 1965-05-28 Réflecteur pour projecteur lumineux
BE656721A (de) * 1964-12-07 1965-04-01
FR1545880A (fr) * 1967-10-05 1968-11-15 Cibie Projecteurs Nouveaux perfectionnements aux projecteurs à faisceau coupé, notamment aux projecteurs de croisement pour véhicules automobiles
DE2921474C2 (de) * 1979-05-26 1983-10-20 Daimler-Benz Ag, 7000 Stuttgart Reflektor für einen Kraftfahrzeug-Scheinwerfer
DE3340462C1 (de) * 1983-11-09 1985-04-18 Westfälische Metall Industrie KG Hueck & Co, 4780 Lippstadt Abgeblendeter Fahrzeugscheinwerfer
US4566056A (en) * 1984-03-08 1986-01-21 Stanley Electric Co., Ltd. Headlamp for vehicle
GB2162625B (en) * 1984-07-31 1988-01-27 Stanley Electric Co Ltd Headlamp for vehicle

Also Published As

Publication number Publication date
DE3762161D1 (de) 1990-05-10
US4772988A (en) 1988-09-20
FR2599121B1 (fr) 1988-09-16
EP0250284A1 (de) 1987-12-23
BR8702675A (pt) 1988-02-23
FR2599121A1 (fr) 1987-11-27
SU1542425A3 (ru) 1990-02-07
JPH0668922B2 (ja) 1994-08-31
JPS62285302A (ja) 1987-12-11

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