EP0247936B1 - Abblendlichtscheinwerfer ohne Abblendkappe und mit versetzter Konzentration - Google Patents

Abblendlichtscheinwerfer ohne Abblendkappe und mit versetzter Konzentration Download PDF

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Publication number
EP0247936B1
EP0247936B1 EP87401170A EP87401170A EP0247936B1 EP 0247936 B1 EP0247936 B1 EP 0247936B1 EP 87401170 A EP87401170 A EP 87401170A EP 87401170 A EP87401170 A EP 87401170A EP 0247936 B1 EP0247936 B1 EP 0247936B1
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Prior art keywords
reflector
filament
quadrants
axis
foci
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EP87401170A
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English (en)
French (fr)
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EP0247936A1 (de
Inventor
Patrice Collot
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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 dipped headlight for a motor vehicle, in which the light beam is located below a cut-off limit defined by two horizontal half-planes slightly offset in height with respect to one another.
  • the profile of the cut is defined approximately, on a standardized screen, by two horizontal half-lines located on either side of the projector axis, the half-line on the right side being at the level of the horizon and the half-line on the left side being offset by about 1.5% below the horizontal.
  • the region of maximum illumination imposed is shifted to the right relative to the axis of the projector.
  • the beams meeting these standards are most often obtained using a projector comprising a transverse filament lamp cooperating with a reflector or parabolic mirror of relatively high focal distance, so as to reduce the thickness of the beam and consequently minimize the excess thickness created by the deflecting prisms on the closing glass.
  • a headlight comprising a reflector of complex shape capable of forming images of the filament below a cut of generally horizontal orientation, and allowing the use of reduced focal distances, and consequently a much greater flux recovery.
  • a projector comprises an axial filament lamp emitting freely all around it, a reflector having an axis extending below the axis of the filament parallel to it and having a surface without discontinuity, and a closing glass placed in front of the reflector and able to effect a distribution of said beam in the horizontal direction.
  • Such a projector is shown diagrammatically, in horizontal section, in FIG. 1. It comprises a unitary reflector 10 comprising a first mirror 10a for the crossing function, the axis 12a of which is offset to the right (downwards in the figure) at an angle 6, and a second mirror 10b, in one piece with the first, whose axis 12b is located in the axis of the road.
  • FR-A-1 400 370 teaches a reflector comprising four quadrants of paraboloidal shape, shifted in an appropriate manner to fold the emitted beam down and to the right without modifying the orientation of the lamp. In this case, the release problems mentioned above would be eliminated.
  • the present invention aims to overcome the drawbacks of the prior art, and in particular to eliminate the demolding problem mentioned above while retaining a reflector on the whole smooth and generating no parasitic ray.
  • the invention aims to propose a projector whose filament retains an orientation parallel to the axis of the track and cooperates with a reflector devoid of any offset of surfaces to ensure the desired drawdown of the beam downwards and laterally.
  • the reflector comprises two first diametrically opposite quadrants, the surfaces of which approach at least approximately two portions of paraboloids whose foci are each located in the vicinity of a respective axial end of the filament, for generate images of the filament creating a light concentration located below the cut and offset laterally relative to the axis of the projector, the other two quadrants being constituted by surfaces ensuring the gradual and continuous transition between the first two quadrants by creating filament images located mainly below the cut.
  • the headlight according to the invention shown diagrammatically in FIGS. 2 to 4, comprises an axial cylindrical filament lamp 100 of length 1 and of radius r, a reflector or mirror 200 and a distribution glass 300 closing the headlight.
  • the axis of the filament 100 is not confused with the axis Ox of the reflector, but is shifted upwards by a distance equal to its radius r. In this way, the lowest part of the emissive surface of the filament is tangent to said axis Ox.
  • the surface of the reflector is a surface without discontinuity, determined so that it forms images of the filament which are for the most part located below a horizontal plane and, as will be seen below, whose most point top is located on this horizontal plane or entirely in its vicinity. It is also determined so that the concentration spot obtained is shifted to the right (or to the left depending on the direction of traffic) relative to the axis of the road.
  • absence of discontinuity is meant a second order continuity, that is to say that at any point of any line drawn on the surface, the tangent planes are the same on both sides of this line. The surface therefore shows no breakage.
  • This arrangement makes it possible, in practice, to produce real surfaces having very good compliance with the theoretical surfaces, in particular avoiding the defects specific to certain mirrors of the prior art having offset paraboloids. In particular, such continuity makes the reflector perfectly stampable.
  • the reflector is divided into four zones or sectors 201 to 204, defined mathematically below, the above-mentioned continuity being ensured in particular at the interface between these sectors.
  • the four sectors separated from each other by the horizontal plane xOy and by the vertical plane xOz, each define a quadrant.
  • quadrant will be used to denote any sector delimited by two planes, substantially horizontal and substantially vertical respectively.
  • the surfaces of quadrants 201 and 202 are designed to generate images of the filament which create a spot of concentration shifted downward and to the right with respect to the axis Ox.
  • the surfaces of the quadrants 203 and 204 are determined to ensure with the above-mentioned continuity the transition between the quadrants 201 and 202, and, on a functional level, to generate images of the filament all located in the vicinity of the axis of the projector, but mostly below the horizontal plane passing through its axis. In particular, the centers of all these images are located below this plane.
  • Af is equal to the difference f 2 ⁇ f 1 and is approximately equal to the length I of the filament.
  • FIGS. 5 to 8 are represented, by isocandela curves on screen C, at C 4 , the illuminations provided by the quadrants 201 to 204 of the reflector 200 of FIGS. 2 to 4 in the absence of closing glass.
  • quadrant 201 produces a spot of concentration which is shifted downwards and to the right with respect to the reference center H of the screen (intersection of said screen with the axis Ox of the projector), from the same way as quadrant 202.
  • This spot of shifted concentration starts, as we can observe the right half-cut of the passing beam.
  • the total light distribution, obtained by superimposing the illuminations represented in FIGS. 5 to 8, is represented in FIG. 9 by isocandela curves C T on a projection screen.
  • FIG. 10 represents, in front view, a possible embodiment of a closing glass particularly well suited to the mirror 200 described above. It comprises thirteen zones 301 to 313 arranged as shown. The zones 301 and 313 are each, respectively, the homolog of a large part of the surface of the quadrants 203 and 204 of the mirror. These zones are non-deflecting, or very little deflecting, so as not to alter the formation of the right cut of the beam.
  • the central zones 306, 307 and 308 will be able to effect a strong horizontal deflection, in particular to give the beam the large width required.
  • the remaining areas of the glass 300 will be moderately deviating horizontally, in particular in order to increase the illumination on the left by initiating the corresponding half-cut and to further extend the right cut as initiated by the part of the beam crossing the areas 301 and 313 .
  • the axis of the filament, and therefore of the lamp of this low beam projector is strictly parallel to the axis of the road. It is easy in this way to associate the low beam headlamp with a headlamp in the form of a single block comprising a two-mirror reflector.
  • the axis of the lamp of a road projector being preferably parallel to the axis of the road, the flanges of the two mirrors will therefore be strictly parallel, which allows the realization of the bi-mirror reflector by an operation particularly simple molding, without difficulty in demolding.
  • such a vertical offset will be of the order of 0.5 mm for a parabolic mirror having a focal distance of 22.5 mm.
  • f i4 and f i3 are focal distances corresponding to two distinct focal points located in the vicinity of the end of the filament closest to the origin of the coordinates
  • f 23 and f 24 are focal distances corresponding to two distinct foci located near the end of the filament furthest from the origin of the coordinates.
  • Each of the surfaces defined above ensures the continuous transition between the neighboring surfaces, continuity being also ensured at the interface between these surfaces two by two.
  • the general concepts of the invention can be implemented in reflectors of low height, thanks to the particularly high light output which is obtained.

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

Claims (6)

1. Abblendlichtscheinwerfer für ein Kraftfahrzeug, geeignet zur Erzeugung eines Abblendlichtstrahls, angeordnet unterhalb eines allgemein horizontalen Begrenzungsebene, von der Art, die eine Axialfadenlampe (100) zur freien Rundumabstrahlung enthält, einen Reflektor (200) mit einer Achse (Ox), die sich unterhalb der Achse des Glühfadens (100) parallel zu dieser erstreckt und eine durchgehende Oberfläche aufweist, sowie eine Verschlußscheibe (300), die vor dem Reflektor angeordnet und geeignet ist, eine Verteilung des genannten Bündels in horizontaler Richtung zu bewirken, wobei der Reflektor zwei einander diametral gegenüberliegende erste Quadranten (201, 202) aufweist, deren Oberflächen sich zumindest in etwa zwei Paraboloidabschnitten annähern, deren Brennpunkte (F1, F2 - F13, F14 und F23, F24) jeweils in Nähe eines axialen Endes des Glühfadens (100) angeordnet sind, um Glühfadenabbilder zu erzeugen und eine Lichtkonzentration zu bewirken, die unterhalb des Schlitzes liegt und seitlich im Verhältnis zur Achse des Scheinwerfers versetzt ist, während zwei andere Quadranten (203, 204) aus Flächen bestehen, die den allmählichen und kontinuierlichen Übergang zwischen den beiden ersten Quadranten gewährleisten und dabei Abbilder des Glühfadens erzeugen, die größtenteils unterhalb der Begrenzungsebene liegen.
2. Scheinwerfer nach Anspruch 1, dadurch gekennzeichnet, daß der Glühfaden (100) zylinderförmig ist und nach oben um einen Abstand, der gleich dem Halbmesser (r) ist, im Verhältnis zur Achse (Ox) des Reflektors (200) versetzt ist.
3. Scheinwerfer nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß die beiden ersten Quadranten (201, 202) Paraboloide sind, deren Brennpunkte (F1, F2) jeweils an den beiden axialen Enden des Glühfadens (100) liegen.
4. Scheinwerfer nach Anspruch 3, dadurch gekennzeichnet, daß die beiden ersten Quadranten (201, 202) Oberflächen aufweisen, die jeweils durch folgende Gleichungen definiert sind:
Figure imgb0016
und daß die beiden zweiten Quadranten (203, 204) Oberflächen aufweisen, die jeweils durch folgende Gleichungen definiert sind:
Figure imgb0017
und
Figure imgb0018
wobei f1 und f2 die Abstände zwischen dem Scheitelpunkt des Reflektors und den Brennpunkten F1 bzw. F2 bezeichnen und Af etwa gleich der Länge des Glühfadens (100) ist.
5. Scheinwerfer nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß die beiden ersten Quadranten (201, 202) Oberflächen aufweisen, die jeweils durch folgende Gleichungen definiert sind:
Figure imgb0019
. und
Figure imgb0020
 und daß die beiden zweiten Quadranten (203,204) Oberflächen aufweisen, die durch folgende Gleichungen definiert sind:
Figure imgb0021
und
Figure imgb0022
wobei f14 und f23 die Abstände zwischen dem Scheitelpunkt des Reflektors (200) und den Brennpunkten F14 bzw. F23 bezeichnen, während f13 und f24 die Abstände zwischen dem Scheitelpunkt des Reflektors (200) und den Brennpunkten F13 bzw. F24 bezeichnen.
6. Scheinwerfer nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Verschlußschiebe (300) zwei Zonen (301,313) enthält, die entweder gar nicht oder nur geringfügig abweichen und die jeweils die Homologe für einen großen Teil der Oberfläche der beiden zweiten Quadranten (203, 204) sind.
EP87401170A 1986-05-26 1987-05-25 Abblendlichtscheinwerfer ohne Abblendkappe und mit versetzter Konzentration Expired - Lifetime EP0247936B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8607461A FR2599120B1 (fr) 1986-05-26 1986-05-26 Projecteurs de croisement sans coupelle a concentration decalee
FR8607461 1986-05-26

Publications (2)

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EP0247936A1 EP0247936A1 (de) 1987-12-02
EP0247936B1 true EP0247936B1 (de) 1990-06-27

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EP87401170A Expired - Lifetime EP0247936B1 (de) 1986-05-26 1987-05-25 Abblendlichtscheinwerfer ohne Abblendkappe und mit versetzter Konzentration

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US (1) US4754374A (de)
EP (1) EP0247936B1 (de)
JP (1) JPH0793042B2 (de)
DE (1) DE3763453D1 (de)
FR (1) FR2599120B1 (de)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2622564B2 (ja) * 1986-12-30 1997-06-18 ヴァレオ ヴイジョン カットオフによって限定されたビームを放射する、変形底部を有する自動車用前照灯
DE3731232A1 (de) * 1987-09-17 1989-03-30 Bosch Gmbh Robert Scheinwerfer fuer fahrzeuge, insbesondere scheinwerfer fuer kraftfahrzeuge
FR2639888B1 (fr) * 1988-12-07 1993-08-13 Valeo Vision Projecteur de vehicule automobile, comportant un reflecteur a surface complexe a zones intermediaires modifiees
US5045982A (en) * 1989-03-17 1991-09-03 Whelen Technologies, Inc. Wide angle warning light
JPH0368305U (de) * 1989-11-02 1991-07-04
GB8927903D0 (en) * 1989-12-09 1990-02-14 Carello Lighting Plc Lamp assembly
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
DE4206881A1 (de) * 1992-03-05 1993-09-09 Bosch Gmbh Robert Abblendlichtscheinwerfer fuer kraftfahrzeuge
JP2750647B2 (ja) * 1992-08-14 1998-05-13 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
GB2294536B (en) * 1994-10-27 1998-06-17 Carello Lighting Plc Vehicle headlight with a complex-surface reflector
CZ287690B6 (cs) * 1996-01-29 2001-01-17 Autopal S. R. O. Světlomet s komplexním reflektorem
JP2002251904A (ja) * 2001-02-23 2002-09-06 Ichikoh Ind Ltd 車両用灯具
FR2982929B1 (fr) * 2011-11-22 2014-01-17 Valeo Vision Dispositif d'emission de lumiere pour projecteur de vehicule automobile

Family Cites Families (8)

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Publication number Priority date Publication date Assignee Title
DE921474C (de) * 1948-10-02 1954-12-20 Siemens Ag Einrichtung zur dielektrischen Behandlung eines band- oder fadenfoermigen Behandlungsgutes
FR1400370A (fr) * 1963-06-17 1965-05-28 Réflecteur pour projecteur lumineux
BE656721A (de) * 1964-12-07 1965-04-01
DE2921474C2 (de) * 1979-05-26 1983-10-20 Daimler-Benz Ag, 7000 Stuttgart Reflektor für einen Kraftfahrzeug-Scheinwerfer
FR2536502B1 (fr) * 1982-11-19 1987-01-09 Cibie Projecteurs Projecteur de croisement pour vehicule automobile
US4506315A (en) * 1982-12-08 1985-03-19 Ichikoh Industries, Ltd. Vehicle headlamp
US4494176A (en) * 1984-03-14 1985-01-15 General Electric Company Lamps having multiple and aimed parabolic sections for increased useful light output
DE3417034A1 (de) * 1984-05-09 1985-11-14 Robert Bosch Gmbh, 7000 Stuttgart Scheinwerfer, insbesondere abblendlicht-scheinwerfer, fuer kraftfahrzeuge

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US4754374A (en) 1988-06-28
EP0247936A1 (de) 1987-12-02
FR2599120B1 (fr) 1988-09-16
FR2599120A1 (fr) 1987-11-27
JPH0793042B2 (ja) 1995-10-09
DE3763453D1 (de) 1990-08-02
JPS62285301A (ja) 1987-12-11

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