EP1279893B1 - Kfz-Scheinwerfer nach dem Projektionprinzip mit um eine Querachse schwenkbaren Blenden - Google Patents

Kfz-Scheinwerfer nach dem Projektionprinzip mit um eine Querachse schwenkbaren Blenden Download PDF

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Publication number
EP1279893B1
EP1279893B1 EP02291779A EP02291779A EP1279893B1 EP 1279893 B1 EP1279893 B1 EP 1279893B1 EP 02291779 A EP02291779 A EP 02291779A EP 02291779 A EP02291779 A EP 02291779A EP 1279893 B1 EP1279893 B1 EP 1279893B1
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EP
European Patent Office
Prior art keywords
shield
lighting
shields
headlight
axis
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Expired - Lifetime
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EP02291779A
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English (en)
French (fr)
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EP1279893A1 (de
Inventor
Eric Blusseau
Joel Leleve
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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
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/68—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on screens
    • F21S41/683—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on screens by moving screens
    • F21S41/689—Flaps, i.e. screens pivoting around one of their edges

Definitions

  • the present invention relates to a projector of the elliptical type for a motor vehicle.
  • the present invention more particularly relates to a motor vehicle headlamp, comprising a light source, an elliptical reflector whose first focus is located in the vicinity of the source, a convergent lens having a focal plane passes in the vicinity of a second focus of the reflector, a first and a second cover that are interposed axially, along the optical axis of the projector, between the reflector and the lens, of the type in which the first cover is pivotally mounted about a substantially transverse axis between a retracted position and a concealment position, the first cache having a cutoff edge which delimits, in the occultation position, a cutoff profile of the light beam emitted by the source in order to perform a first lighting function, and of the type in which the second cover is movably mounted between a retracted position and an occultation position which makes it possible to carry out at least a second lighting function by modifying the cutoff profile of the light beam, the second cover being pivotally mounted about a substantially transverse
  • a headlamp When such a headlamp is to form a cut-off beam, such as a passing beam or a fog beam, it comprises a cover interposed axially between the light source and the lens, which obscures the part of the radiation, which would otherwise propagate to the above this cut.
  • a known solution to modify the profile of the cutoff is to intervene on the projector cover to modify the cutoff profile.
  • an elliptical projector of the type comprising a first cover provided between the reflector and the lens, which has an edge defining a first particular cutoff profile for the emitted light beam, and a second cover disposed on the first cover and selectively movable between two positions a first position in which an edge of the second cover is positioned in the path of the light rays to form with the first cover a light beam with a second particular cutoff profile, and a second position in which said edge of the second cover is substantially positioned out of the path of the light rays to form a light beam with the first cutoff profile.
  • a solution for selectively realizing a code function or a route function consists in rotating the movable cover of the projector to position it respectively in or out of the emitted light beam.
  • a projector elliptical type that includes a pivoting cover between a code position and a road position, about a generally horizontal axis and parallel to the optical axis.
  • the cover is pivotally mounted to a frame portion of the projector at one of its lateral sides, and the pivoting movement of the cover is effected such that it always remains in the vertical plane transverse to the optical axis where it is in the code position.
  • Such a projector has several disadvantages.
  • the emitted light beam has a reduced light intensity due to the fact that a part of the cover, located on the side of the pivot axis of the latter, still remains in the path of the light rays emitted .
  • the mounting of the pivoting cover on one of its lateral sides causes a bad balancing of the cache which is not supported on the other side.
  • pivoting cover arrangement requires the use of bulky and powerful actuating means to ensure with the desired speed the return of the cache in the road position to the code position.
  • the document FR-A-2796449 proposes a projector of the elliptical type which comprises a main cover pivotally mounted about a transverse axis and which comprises a secondary cover pivotally mounted about an axis parallel to the optical axis.
  • the projector When the main cover is in the occultation position, ie in a transverse plane, and when the secondary cover is in the retracted position downward, the projector produces a lighting beam with a first cutoff profile.
  • the projector When it controls the pivoting of the secondary cover to its high occultation position, the main cache occupying its occultation position, then the projector realizes a lighting beam with a second cutoff profile different from the first.
  • the secondary cache is provided to modify the cutoff made by the main cache in the lighting beam by increasing the concealed surface.
  • the secondary cache does not make it possible to produce a lighting beam which has a specific cutoff profile comprising a lighting zone which is less obscured with respect to the first cutoff profile.
  • the secondary cache being of small dimensions, the thermal stresses to which it is subjected inside the projector can change its geometry and cause malfunctions of the projector.
  • the road function is difficult to achieve because of the proximity of the pivot axis of the secondary cover with the upper part of the main cover, this proximity being imposed by the optical conjugation of the lens with the reflector.
  • each cache consists of two parts extending in perpendicular and solidarity planes of the same rotation shaft.
  • the right and left caches are nested one inside the other so that the parts of the two caches can be combined in different ways to form bundles with different cuts.
  • Such a design of caches is relatively complex, resulting in a high cost.
  • this projector can only make beams cut or crossing, not a driving beam.
  • the invention aims to remedy these drawbacks by providing a projector with movable covers that is simple and economical.
  • each cover has the shape of a plate, in particular rectangular, having two substantially transverse and horizontal edges, and the pivot axis of each cover is arranged along one of its transverse edges.
  • a projector 10 for a motor vehicle which comprises a lamp 12 mounted in the bottom of a reflector 14 of the elliptical type so that the filament 16 of the lamp 12 is in the vicinity of a first focus of the reflector 14 .
  • optical axis AA is generally parallel to the longitudinal axis of the vehicle that the projector 10 equips.
  • the optical axis A-A is here substantially horizontal and can be defined for example by the two focal points of the reflector 14.
  • a transverse direction is defined which is substantially horizontal and orthogonal to the optical axis A-A.
  • the projector 10 has a convergent lens 18 which is mounted at the front in a frame portion 20 of the projector 10 fixed to a front transverse surface 22 of the reflector 14.
  • the focal plane of the lens 18 passes near the second focus of the reflector 14.
  • the projector 10 comprises a first cover 24 and a second cover 26 which are interposed axially (A-A) between the reflector 14 and the lens 18, in the vicinity of the focal plane of the lens 18.
  • a projector optical unit 10 which is for example mounted in a conventional manner in a housing (not shown) closed by an ice.
  • the first cover 24 and the second cover 26 are pivotally mounted with respect to the reflector 14, each around a transverse geometric axis, respectively a rear axis A1 and a front axis A2, between a position retracted Pe and an occultation position Po.
  • the two covers 24 and 26 are pivotally mounted about the same axis.
  • the covers 24, 26 are for example mounted pivotably on an intermediate frame part 27 which is interposed axially between the reflector 14 and the frame part 20.
  • control actuators could be used, for example electromagnet actuators such as those used for pivoting the covers in the document.
  • electromagnet actuators such as those used for pivoting the covers in the document.
  • FR-A-2796449 which can be referred to for more details.
  • the electric motors 30, 32 are controlled by an electronic control unit (not shown).
  • the first cover 24 is shown in occultation position Po and the second cover 26 is shown in the retracted position Pe.
  • each cover 24, 26 has the overall shape of a rectangular plate which, in the occultation position Po, extends in a transverse and vertical plane, and which, in the retracted position Pe , extends in a horizontal plane.
  • the rectangular plates forming the covers 24, 26 have significant dimensions which promotes their ability to evacuate heat and which allows them to be insensitive to thermal stresses inside the projector 10.
  • the first cover 24 is plate-shaped and has two substantially transverse edges 34, 36 and, by way of nonlimiting example, two substantially vertical side edges 38, 40 which give the plate a generally rectangular shape.
  • the geometric pivot axis A1 of the first cover 24 is arranged here along the lower transverse edge, or transverse pivoting edge 34.
  • the first cover 24 has at each end of the transverse pivoting edge a shaft section 42, 44 which, on one side, is rotatably mounted in a bearing 43 and on the other side is rotatably connected to the drive shaft of an electric motor 30.
  • the transverse edge 36 opposite the transverse pivoting edge 34 forms the cutoff edge of the cover 24, that is to say that it defines a cutoff profile for the lighting beam emitted by the projector 10 when the cover 24 occupies its position. occultation position Po.
  • the cutoff edge 36 of the first cover 24 is for example designed to perform a lighting function of the "AFS” type. It presents here a relief made of several horizontal portions and several inclined portions that can enable it to perform a lighting function of the type "Adverse Weather Lighting” ie a lighting function for circulation in rainy weather that limits the glare produced towards vehicles traveling in opposite directions.
  • the cutoff edge 36 of the first cover 24 may be provided to perform another type of lighting function, for example a lighting function for city traffic or a lighting function for highway traffic.
  • the second cover 26 is similar to the first cover 24 and is shown in its retracted position Pe on the figures 1 and 3 .
  • the second cover 26 thus has a transverse cutoff edge 46 and a transverse pivoting edge 48 which comprises at one end a shaft section 50 mounted to rotate freely in a bearing 51, and at the opposite end a section shaft 52 which is rotatably connected to the drive shaft of a second electric motor 32.
  • first cover 24 and / or the second cover 26 are driven by the motors 30 and 32 via a gear train forming a speed reducer.
  • one and / or the other cover 24 and 26 is integral with a toothed wheel meshing with an endless screw secured to the output shaft of the motors 30 and 32.
  • the cutoff edge 46 of the second cover 26 is for example designed to perform a lighting function at low beam. It therefore comprises two horizontal portions 54, 56 offset vertically, in the occultation position Po, and connected by an inclined portion 58 so that the projector 10 carries a regulatory beam of dipped beam.
  • the cut edges 36, 46 of the two covers 24, 26 are provided so that, when the two covers 24, 26 occupy their occultation position Po, the superposition of the covers 24, 26 along the optical axis AA makes it possible to perform an additional "AFS" lighting function.
  • this lighting function must comprise a lighting beam having a greater occulted portion than in each of the lighting functions associated with the two covers 24, 26, since the light beam associated with this additional lighting function will be obscured by both the first 24 and the second 26 caches.
  • This additional lighting function is for example a lighting function for city traffic in which (“TownLighting") the occultation is greater than in the rainy weather lighting (“Adverse Weather Lighting”).
  • the two pivot axes A1, A2 are adjacent and contained in the same horizontal plane, furthermore they are located below the optical axis A-A.
  • the first cover 24 pivots about a quarter turn forward and upward, while the second cover 26 rotates about a quarter turn backwards and upwards.
  • the corresponding cap here the second cap 26, is controlled in the blackout position Po and the first cap 24 is controlled in the retracted position Pe, which corresponds to the situation represented on the figure 4 .
  • the second cover 26 is then controlled in its retracted position Pe, which causes it to pivot a quarter of a turn, in the clockwise direction, considering the figure 1
  • the first cover 24 is controlled in its occultation position Po, which causes it to pivot a quarter of a turn, in the clockwise direction, considering the figure 1 .
  • the first cover 24 folds towards the inside of the reflector 14, so that it covers a lower portion of the reflective concave surface of the reflector 14. This characteristic is not disadvantageous because the zone of the reflector 14 which it covers in the retracted position Pe has practically no optical function for producing the illumination beam.
  • the two covers 24, 26 are not in the path of the light rays producing the illumination beam, which makes it possible to obtain a driving beam of light having a maximum light intensity and therefore a effective road fire beam.
  • the occultation effect produced by the two covers 24, 26 is superimposed and makes it possible to obtain a light beam having a specific cutoff profile, different from those obtained with only one of the covers 24, 26 in the occultation position Po.
  • At least one of the two covers 24, 26 may have its pivot axis A1, A2 arranged above the optical axis AA.
  • the second cover 26 is shown with its pivoting geometric axis A2 arranged above the optical axis AA.
  • the second cover 26 in the occultation position Po and the first cover 24 in the retracted position Pe.
  • the rectangular plate forming the second cover 26 comprises an occulting lower portion 60 and an upper portion 62 comprising a window 64 to allow the passage of the light beam in order to perform the associated lighting function, here the low beam function.
  • the window 64 is delimited downwards by the substantially transverse upper edge 66 of the occulting portion 60 which forms the cutoff edge of the cover.
  • the window 64 is delimited upwards by the upper transverse pivoting edge 68 of the cover 26, which carries at one end the shaft section 50 mounted to rotate in the associated bearing 51, and at the opposite end the section of shaft 52 linked to rotation to the associated motor shaft 32.
  • the cutoff edge 66 and the pivot edge 68 of the cover 26 are connected here by two vertical lateral uprights 70, 72.
  • the second cover 26 pivots a quarter of a turn in the counter-clockwise direction.
  • the projector 10 may include an additional cache to achieve at least one additional lighting function.
  • This additional cache may for example be arranged with its pivot axis above the optical axis AA, as the second cache of the figure 2 , the first cache 24 and the second cache 26 then being made according to the embodiment described with reference to the figure 1 .

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Automatic Cycles, And Cycles In General (AREA)

Claims (10)

  1. Kraftfahrzeugscheinwerfer (10) mit einer Lichtquelle (16), einem Ellipsoidreflektor (14), dessen erster Brennpunkt in der Nähe der Lichtquelle (16) liegt, einer Sammellinse (18), deren eine Brennebene in der Nähe eines zweiten Brennpunkts des Reflektors (14) verläuft, einer ersten (24) und einer zweiten (26) Blende, die entlang der optischen Achse (A-A) des Scheinwerfers (10) zwischen dem Reflektor (14) und der Linse (18) axial eingefügt sind, des Typs, bei dem die erste Blende (24) um eine im Wesentlichen quer verlaufende Achse (A1) herum zwischen einer abgesenkten Stellung (Pe) und einer abschattenden Stellung (Po) schwenkbar montiert ist, wobei die erste Blende (24) einen Begrenzungsrand (36) aufweist, der in der abschattenden Stellung (Po) ein Hell-Dunkel-Grenzenprofil des von der Lichtquelle (16) abgegebenen Lichtbündels zur Realisierung einer ersten Lichtfunktion begrenzt, und des Typs, bei dem die zweite Blende (26) einen zur Realisierung einer zweiten Lichtfunktion vorgesehenen und zwischen einer abgesenkten Stellung (Pe) und ein abschattenden Stellung (Po) beweglich montierten, quer verlaufenden Begrenzungsrand (46) aufweist, der wenigstens die Realisierung der zweiten Lichtfunktion durch Veränderung des Hell-Dunkel-Grenzenprofils des Lichtbündels ermöglicht, wobei die zweite Blende (26) um eine im Wesentlichen quer verlaufende Achse (A2) herum schwenkbar montiert ist und jede Blende (24, 26) die Form einer insbesondere rechteckigen Platte mit zwei im Wesentlichen quer verlaufenden, waagerechten Ränder (34, 36, 46, 48, 66, 68) hat, und wobei die Schwenkachse (A1, A2) jeder Blende (24, 26) entlang eines ihrer quer verlaufenden Ränder (34, 35, 46, 48, 66, 68) angeordnet ist,
    dadurch gekennzeichnet, dass die Begrenzungsränder (36 und 46) der beiden Blenden (24 und 26) dazu vorgesehen sind, dass die Überlagerung der Blenden (24 und 26), wenn sich die beiden Blenden (24 und 26) in ihrer abschattenden Stellung (Po) befinden, längs der optischen Achse (A-A) eine dritte Lichtfunktion zu realisieren ermöglicht, wobei jede der beiden Blenden (24, 26) unabhängig voneinander betätigt und verwendet werden kann, so dass in Abhängigkeit ihrer relativen Lage (Po, Pe) wenigstens drei verschiedene Lichtfunktionen realisiert werden, wobei der von den beiden sich überlagernden Blenden (24, 26) bewirkte Abschattungseffekt ein Lichtbündel zu erzielen erlaubt, das ein spezifisches Hell-Dunkel-Grenzenprofil aufweist, das sich von den beiden mit nur einer der Blenden (24, 26) in der abschattenden Position (Po) erzielten Profilen unterscheidet.
  2. Scheinwerfer (10) nach dem vorhergehenden Anspruch,
    dadurch gekennzeichnet, dass ein vorschriftsmäßiges Fernlichtbündel realisiert wird, wenn beide Blenden (24, 26) in die abgesenkte Stellung (Pe) gebracht werden.
  3. Scheinwerfer (10) nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass die Schwenkachse (A1, A2) wenigstens einer Blende (24, 26) unterhalb der optischen Achse (A-A) angeordnet ist, und dass der quer verlaufende Rand (36, 46) der Blende (24, 26), der ihrer Schwenkachse (A1, A2) entgegengesetzt ist, deren Begrenzungsrand (36, 46) definiert.
  4. Scheinwerfer (10) nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass sich, wenn sich eine Blende (24, 26) in ihrer abgesenkten Stellung (Pe) befindet, diese allgemein in einer horizontalen Ebene erstreckt, und dass sich, wenn sich eine Blende (24, 26) in ihrer abschattenden Stellung (Po) befindet, diese allgemein in einer vertikalen Ebene erstreckt.
  5. Scheinwerfer (10) nach dem vorhergehenden Anspruch,
    dadurch gekennzeichnet, dass die Schwenkachsen (A1, A2) der beiden Blenden (24, 26) benachbart sind, wobei die Achse (A1) der ersten Blende (24) bezüglich der Achse (A2) der zweiten Blende (26) axial (A-A) nach hinten versetzt ist, dass sich die erste Blende (24), wenn sich diese in ihrer abgesenkten Stellung (Pe) befindet, axial (A-A) nach hinten erstreckt, während sich die zweite Blende (26) axial (A-A) nach vorne erstreckt, und dass die erste Blende (24) zum Wechseln aus einer abgesenkten Stellung (Pe) in eine abschattende Stellung (Po) mit etwa einer Vierteldrehung nach vorne und nach oben schwenkt, während die zweite Blende (26) mit etwa einer Vierteldrehung nach hinten und nach oben schwenkt.
  6. Scheinwerfer (10) nach einem der Ansprüche 1 bis 3,
    dadurch gekennzeichnet, dass die Schwenkachse (A2) wenigstens einer Blende (26) über der optischen Achse (A-A) angeordnet ist, und dass die die Blende (26) bildende Platte in ihrer abschattenden Stellung (Po) ein abschattendes unteres Teil (60) und ein oberes Teil (62) mit einem Fenster (64) aufweist, um den Durchlass des Lichtbündels zum Bilden der zugeordneten Lichtfunktion zu ermöglichen, wobei das Fenster (64) nach unten durch den im Wesentlichen quer verlaufenden oberen Rand des abschattenden Teils (60) begrenzt ist, der den Begrenzungsrand der Blende (26) bildet.
  7. Scheinwerfer (10) nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass:
    - der Begrenzungsrand (36) der ersten Blende (24) zur Realisierung einer Lichtfunktion vom Typ "AFS" vorgesehen ist;
    - der Begrenzungsrand (46) der zweiten Blende (26) zur Realisierung einer Abblendlichtfunktion vorgesehen ist; und
    - die Begrenzungsränder (36, 46) der beiden Blenden (24, 26) dazu vorgesehen sind, dass die Überlagerung der beiden Blenden (24, 26) in der abschattenden Stellung (Po) die Realisierung einer zusätzlichen Lichtfunktion vom Typ "AFS" ermöglicht.
  8. Scheinwerfer (10) nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass:
    - ein vorschriftsmäßiges Abblendlichtbündel realisiert wird, wenn die erste Blende (24) in die abgesenkte Stellung (Pe) und die zweite Blende (26) in die abschattende Stellung (Po) gebracht wird;
    - ein weitergebildetes Lichtbündel, etwa ein Schlechtwetterlicht oder ein Stadtlicht oder ein Autobahnlicht erzeugt wird, wenn die erste Blende (24) in die abschattende Stellung (Po) und die zweite Blende (26) in die abgesenkte Stellung (Pe) gebracht wird;
    - ein vorschriftsmäßiges Fernlichtbündel erzeugt wird, wenn beide Blenden (24, 26) in die abgesenkte Stellung (Pe) gebracht werden;
    - ein weitergebildetes Lichtbündel erzeugt wird, wenn beide Blenden (24, 26) in die abschattende Stellung (Po) gebracht werden.
  9. Scheinwerfer (10) nach Anspruch 8,
    dadurch gekennzeichnet, dass:
    - ein Schlechtwetterlicht erzeugt wird, wenn die erste Blende (24) in die abschattende Stellung (Po) und die zweite Blende (26) in die abgesenkte Stellung (Pe) gebracht wird;
    - ein Stadtlicht erzeugt wird, wenn beide Blenden (24, 26) in die abschattende Stellung (Po) gebracht werden.
  10. Scheinwerfer (10) nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass er wenigstens eine zusätzliche Blende zur Realisierung wenigstens eines zusätzlichen Lichtbündels aufweist.
EP02291779A 2001-07-26 2002-07-15 Kfz-Scheinwerfer nach dem Projektionprinzip mit um eine Querachse schwenkbaren Blenden Expired - Lifetime EP1279893B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0110288A FR2827945B1 (fr) 2001-07-26 2001-07-26 Projecteur elliptique equipe de caches a axes de pivotement transversaux pour vehicule automobile
FR0110288 2001-07-26

Publications (2)

Publication Number Publication Date
EP1279893A1 EP1279893A1 (de) 2003-01-29
EP1279893B1 true EP1279893B1 (de) 2010-12-01

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Country Link
US (1) US20030021119A1 (de)
EP (1) EP1279893B1 (de)
JP (1) JP2003100121A (de)
AT (1) ATE490438T1 (de)
DE (1) DE60238465D1 (de)
FR (1) FR2827945B1 (de)

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Publication number Priority date Publication date Assignee Title
US3124309A (en) * 1964-03-10 Anti-glare headlight for motor vehicles
FR1296036A (fr) * 1961-05-04 1962-06-15 Projecteur à double faisceau faisant utilisation d'une source lumineuse axiale
DE3903631C1 (de) 1989-02-08 1990-07-05 Hella Kg Hueck & Co, 4780 Lippstadt, De
JP2765643B2 (ja) * 1992-06-03 1998-06-18 株式会社小糸製作所 投射型自動車用ヘッドランプ
FR2796449B1 (fr) 1999-07-13 2001-08-17 Valeo Vision Projecteur pour vehicule automobile avec un cache a multipositions

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FR2827945A1 (fr) 2003-01-31
JP2003100121A (ja) 2003-04-04
DE60238465D1 (de) 2011-01-13
ATE490438T1 (de) 2010-12-15
EP1279893A1 (de) 2003-01-29
FR2827945B1 (fr) 2004-02-27
US20030021119A1 (en) 2003-01-30

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