EP0742408A1 - Motor vehicle headlamp comprising stray light shielding means and lamp including such shielding means - Google Patents

Motor vehicle headlamp comprising stray light shielding means and lamp including such shielding means Download PDF

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Publication number
EP0742408A1
EP0742408A1 EP19960401019 EP96401019A EP0742408A1 EP 0742408 A1 EP0742408 A1 EP 0742408A1 EP 19960401019 EP19960401019 EP 19960401019 EP 96401019 A EP96401019 A EP 96401019A EP 0742408 A1 EP0742408 A1 EP 0742408A1
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EP
European Patent Office
Prior art keywords
lamp
source
bulb
mirror
light
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Granted
Application number
EP19960401019
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German (de)
French (fr)
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EP0742408B1 (en
Inventor
Benoît Reiss
Vincent Raillard
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Valeo Vision SAS
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Valeo Vision SAS
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Publication of EP0742408A1 publication Critical patent/EP0742408A1/en
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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
    • F21S41/40—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades
    • F21S41/43—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades characterised by the shape thereof
    • F21S41/435—Hoods or cap-shaped
    • 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

Definitions

  • the present invention relates generally to motor vehicle headlamps equipped in particular with discharge lamps.
  • a headlamp is equipped with a filament lamp powered by the DC voltage supplied by the vehicle battery.
  • Discharge lamps have been developed recently for the use of motor vehicle headlamps, which require specific ignition and supply circuits, but which have the advantage, at the same power, of generating a much higher luminous flux. to that generated by an incandescent filament.
  • One of these techniques consists in associating with the source a cup masking a part of the mirror, but then a significant quantity of the luminous flux is lost (case in particular of a standard lamp "H4").
  • Another technique consists in resorting to a mirror of specific design, capable of generating by itself a beam with a clear cut.
  • This cover is designed simply as a function of the source, without taking into account any parasitic sources produced by the reflection of the radiation from the main source on adjacent parts of the lamp.
  • These adjacent parts can in particular be the salts of a discharge lamp, or of its electrodes, or even, and more inconveniently, the ceramic sleeve surrounding a lamp supply conductor situated outside the bulb, generally below it.
  • a major drawback of these parasitic sources lies in that, in cooperation with the mirror, they will most often generate light in significant quantity above the desired cut-off. This problem also arises in "HIR" type lamps.
  • the present invention aims to solve this drawback in the context of a lamp capable of presenting parasitic sources and comprising by itself means for obscuring part of the radiation coming from the source in the direction of determined areas of the mirror, these means being able to in particular include two opaque zones in the form of bands provided on the bulb and intended to promote obtaining a clean cut.
  • the present invention more specifically aims to propose a new masking or concealment device which reduces a substantial part of the dazzling due to the aforementioned parasitic sources, while causing a minimal reduction in the effective light flux, effectively participating in the formation of the light beam. .
  • the present invention proposes, according to a first aspect, a motor vehicle headlight as defined in claim 1.
  • the invention provides a lamp for a motor vehicle headlight as defined in claim 7.
  • FIG. 1 shows a motor vehicle headlight comprising a gas discharge lamp 10 mounted in a mirror 20.
  • the lamp comprises, in a bulb or glass envelope 12 of generally cylindrical shape, coaxial with the optical axis xx of the mirror, two electrodes 14a, 14b between which can be started and maintained, by appropriate electrical control, a luminous electric arc constituting the light source S of the projector.
  • the front electrode 14b is connected to the base 15 of the lamp by a conductor 16 comprising a descending branch 16a and a generally horizontal branch 16b, extending below the bulb and parallel to the axis x-x, up to the base.
  • This horizontal branch of the conductor 16 is surrounded by a ceramic sleeve 17, in a conventional manner.
  • the lamp 10 also includes a direct light cover 18 connected to the base 15 of the lamp by an appropriate support (not shown) which is treated so as to minimize parasitic reflections thereon.
  • the bulb 12 of the lamp conventionally in itself, comprises two opaque zones 12a, 12b intended to obscure the radiation coming from the source S and which would go towards two specific zones of the mirror.
  • These opaque zones are here in the form of bands extending parallel to the axis of the lamp, and are preferably produced by applying an opaque paint to the bulb.
  • one of these zones Z1 covers, to the left of the lamp in front view, a sector comprised between a horizontal half-plane P1 and a half-plane P2 inclined at 25 ° below the horizontal .
  • the other of these zones Z2 covers, to the right of the lamp in front view, a sector comprised between a half-plane P3 inclined at 15 ° below the horizontal and a half-plane P4 inclined at 40 ° below the horizontal .
  • This particular embodiment is of course not to be considered as limiting.
  • the mirror 20 is in this case a mirror capable of producing by itself, without the intervention of a cup, a European standard passing beam, by a specific design as described in a certain number of patents prior to the name of the Applicant.
  • the masking carried out by the strips 12a, 12b is intended to perfect the light beam produced by the mirror, by attenuating the light in certain areas of the beam and in particular the light susceptible, by imperfections of the reflecting surface, to overflow above the cut.
  • FIG. 2 also shows the conductor 16b provided with its sleeve 17.
  • the reflection of the light coming from the source S on this sleeve means that the latter constitutes a parasitic light source S ', mainly lighting upwards and towards the sides.
  • This parasitic source in cooperation with the mirror, is capable - by its position below the source S - of giving rise in the beam generated to a non-negligible amount of light above the desired cut-off.
  • Such a lamp can also give rise to other types of parasitic sources, and in particular to a source S '' linked to the presence of salts inside the envelope 12 or the electrodes 14a, 14b.
  • FIG. 3 there is shown a lamp according to the invention, with which two occulters are associated which are intended to intercept a substantial part of the radiation coming from the parasitic source and which would go towards the mirror, and which have the characteristic of being placed in the two shadow zones Z1 and Z2 caused by the opaque bands 12a, 12b.
  • these occulters have no influence on the light emitted by the source S, and therefore on the beam generated by the mirror from said source.
  • by obscuring most of the radiation scattered by the parasitic source and likely to meet the mirror they prevent this radiation from generating in the beam of light above the cut.
  • the occulters are in this case in the form of flat plates 13a, 13b, for example metallic, which extend substantially radially from the bulb 12 over an extent at least equal to, and preferably greater than, that of the parasitic source S '.
  • these plates do not extend strictly radially, but are inclined, from the inside towards the outside, from the upper limit plane of the zone considered towards their lower limit plane.
  • the blinds 13a and 13b can be fixed in place by being made integral with the direct light cover 18 (for example welded or crimped), by presenting recesses 131a, 131b extending said blinds forward on a certain distance on either side of the cache.
  • the underside of the concealment plates 13a, 13b has a light-absorbing coating (matt black paint or the like).
  • the occulters 13a, 13b can be fixed directly to the base 15 of the lamp.
  • the occulters 13a, 13b themselves which constitute means for mounting the direct light cover 18 on the base or on the mirror, in which case the occulters are secured to the base or the mirror at their rear end and secured to the cover 18 at their front end.
  • the invention generally applies to any type of lamp comprising, outside the bulb, one or more organs, in particular electrodes, capable of constituting parasitic sources, and covers in particular the so-called “HIR” lamps (Halogen Infra Red, in which the balloon of the lamp retro-reflects the infrared radiation emitted by the filament towards this same filament to increase the light excitation.
  • HIR Hexogen Infra Red
  • This projector comprises a screening part which comprises a part forming a direct light cover 18 with a curved upper wall 181, two vertical side walls 182, 183, a horizontal lower wall 186 and a front wall 187.
  • Two bevelled parts 184, 185 ensure the transition between the side walls and the bottom wall.
  • edges of the upper, lower and lateral walls opposite the front wall have a geometry such that the radiation coming from the lamp only reaches the useful parts of the mirror 20.
  • the occluders 13a, 13b whose function is identical to that of the occluders described with reference to FIGS. 3 and 4, at the same time constitute the means for fixing the part 18 forming a mask of direct light on the mirror 20 , so that no additional fixing part such as bracket, upright, etc., likely to reduce the light output and / or generate parasitic radiation, is necessary.
  • These extensions are capable of locking, after elastic deformation for their establishment, in two openings 21a, 21b formed in the mirror 20 on either side of the lamp hole.
  • the placing of the lamp in the lamp hole can be used either to ensure the mounting of the concealment piece on the mirror, or to confirm the mounting carried out for example as described above, by coming in this case to exert a support radially outwards at the level of the extensions 132a, 132b and perform an appropriate axial setting, to avoid any risk of unlocking.
  • Figure 8 shows the angular arrangement of the occluders 13a, 13b so that they are well located in the shadow areas created by the opaque areas 12a, 12b of the bulb.
  • the parts 13a and 13b of the concealment piece can alternatively be oriented not vertically but with an oblique inclination, as in the case of FIGS. 3 and 4.

Abstract

The vehicle headlamp has a bulb (12) with a light source in its interior. The lamp is at the end of an extended arm serving as connector and support (17). The lamp is placed at the focus of a parabolic reflector (20), and a front glass closes the lamp. The lamp has a screen (12a,12b) positioned to block some of the light emerging from the lamp and creating a dark zone on the reflector. A second screen (13a,13b) masks a part of the reflector that would normally receive parasitic light generated by reflection from the connector/support structure carrying the lamp. The screens are formed by generally radially plates. A screen (18) directly in front of the lamp blocks emission of light directly from the light source.

Description

La présente invention concerne d'une façon générale les projecteurs de véhicules automobiles équipés notamment de lampes à décharge.The present invention relates generally to motor vehicle headlamps equipped in particular with discharge lamps.

De façon classique, un projecteur est équipé d'une lampe à filament alimentée par la tension continue délivrée par la batterie du véhicule.Conventionally, a headlamp is equipped with a filament lamp powered by the DC voltage supplied by the vehicle battery.

On a développé récemment à l'usage des projecteurs de véhicules automobiles des lampes à décharge, qui nécessitent des circuits d'amorçage et d'alimentation spécifiques, mais qui ont l'avantage, à même puissance, d'engendrer un flux lumineux bien supérieur à celui engendré par un filament incandescent.Discharge lamps have been developed recently for the use of motor vehicle headlamps, which require specific ignition and supply circuits, but which have the advantage, at the same power, of generating a much higher luminous flux. to that generated by an incandescent filament.

Par ailleurs, l'un des principaux problèmes dans la conception d'un projecteur de véhicule automobile destiné à émettre un faisceau à coupure nette, c'est-à-dire non susceptible d'éblouir les conducteurs des véhicules roulant en sens inverse, est d'autant plus aigu avec ce nouveau type de source.Furthermore, one of the main problems in the design of a motor vehicle headlamp intended to emit a beam with a clear cut, that is to say not likely to dazzle drivers of vehicles traveling in opposite directions, is all the more acute with this new type of source.

On connaît différentes techniques pour former un faisceau à coupure nette. L'une de ces techniques consiste à associer à la source une coupelle masquant une partie du miroir, mais alors une quantité significatif du flux lumineux est perdue (cas notamment d'une lampe normalisée "H4").Various techniques are known for forming a clean cut beam. One of these techniques consists in associating with the source a cup masking a part of the mirror, but then a significant quantity of the luminous flux is lost (case in particular of a standard lamp "H4").

Une autre technique consiste à recourir à un miroir de conception spéficique, apte à engendrer par lui-même un faisceau à coupure nette.Another technique consists in resorting to a mirror of specific design, capable of generating by itself a beam with a clear cut.

Il est par ailleurs connu de placer en avant de la source un cache destiné à masquer la lumière émise par la source directement vers la glace du projecteur (lumière "directe").It is also known to place in front of the source a mask intended to mask the light emitted by the source directly towards the lens of the projector ("direct" light).

Ce cache est conçu simplement en fonction de la source, sans tenir compte des éventuelles sources parasites produites par la réflexion du rayonnement issu de la source principale sur des parties adjacentes de la lampe.This cover is designed simply as a function of the source, without taking into account any parasitic sources produced by the reflection of the radiation from the main source on adjacent parts of the lamp.

Ces parties adjacentes peuvent être notamment des sels d'une lampe à décharge, ou de ses électrodes, ou encore, et de façon plus gênante, le manchon céramique entourant un conducteur d'alimentation de la lampe situé à l'extérieur du bulbe, généralement au-dessous de celui-ci. Un inconvénient majeur de ces sources parasites réside en ce qu'en coopération avec le miroir, elles vont le plus souvent engendrer de la lumière en quantité importante au-dessus de la coupure recherchée. Ce problème se pose également dans des lampes de type "HIR".These adjacent parts can in particular be the salts of a discharge lamp, or of its electrodes, or even, and more inconveniently, the ceramic sleeve surrounding a lamp supply conductor situated outside the bulb, generally below it. A major drawback of these parasitic sources lies in that, in cooperation with the mirror, they will most often generate light in significant quantity above the desired cut-off. This problem also arises in "HIR" type lamps.

La présente invention vise à résoudre cet inconvénient dans le cadre d'une lampe susceptible de présenter des sources parasites et comportant par elle-même des moyens pour occulter une partie du rayonnement issu de la source en direction de zones déterminées du miroir, ces moyens pouvant notamment comprendre deux zones opaques en forme de bandes prévues sur le bulbe et destinées à favoriser l'obtention d'une coupure nette.The present invention aims to solve this drawback in the context of a lamp capable of presenting parasitic sources and comprising by itself means for obscuring part of the radiation coming from the source in the direction of determined areas of the mirror, these means being able to in particular include two opaque zones in the form of bands provided on the bulb and intended to promote obtaining a clean cut.

La présente invention vise plus précisément à proposer un nouveau dispositif de masquage ou d'occultation qui réduise une partie substantielle des éblouissements dûs aux sources parasites précitées, le tout en causant une réduction minime du flux lumineux efficace, participant effectivement à la formation du faisceau lumineux.The present invention more specifically aims to propose a new masking or concealment device which reduces a substantial part of the dazzling due to the aforementioned parasitic sources, while causing a minimal reduction in the effective light flux, effectively participating in the formation of the light beam. .

Ainsi la présente invention propose, selon un premier aspect, un projecteur de véhicule automobile tel que défini dans la revendication 1.Thus, the present invention proposes, according to a first aspect, a motor vehicle headlight as defined in claim 1.

Selon un deuxième aspect, l'invention propose une lampe pour projecteur de véhicule automobile telle que définie dans la revendication 7.According to a second aspect, the invention provides a lamp for a motor vehicle headlight as defined in claim 7.

Certains aspects préférés, mais non limitatifs, de la présente invention sont définis dans les sous-revendications.Certain preferred, but not limiting, aspects of the present invention are defined in the dependent claims.

D'autres aspects, buts et avantages de la présente invention apparaîtront mieux à la lecture de la description détaillée suivante d'une forme de réalisation préférée de celle-ci, donnée à titre d'exemple non limitatif et faite en référence aux dessins annexés, sur lesquels :

  • la figure 1 est une vue en coupe verticale axiale d'une partie d'un projecteur de véhicule automobile équipé d'une lampe à décharge gazeuse conventionnelle,
  • la figure 2 est une vue de face schématique et partielle du projecteur de la figure 1,
  • la figure 3 est une vue analogue à la figure 2, montrant une lampe équipée selon la présente invention,
  • la figure 4 est une vue schématique en perspective d'une lampe équipée selon la présente invention,
  • la figure 5 est une vue partielle en coupe verticale d'un projecteur selon une autre forme de réalisation de l'invention,
  • la figure 6 est une vue en perspective de l'ensemble lampe-pièce d'occultation du projecteur de la figure 5,
  • la figure 7 est une vue de la gauche de la pièce d'occultation de la figure 6,
  • la figure 8 est une vue de face de la pièce d'occultation de la figure 6,
  • la figure 9 est une vue de la droite de la pièce d'occultation de la figure 6, et
  • la figure 10 est une vue de dessus de la pièce d'occultation de la figure 6.
Other aspects, aims and advantages of the present invention will appear better on reading the description following detailed description of a preferred embodiment thereof, given by way of nonlimiting example and made with reference to the appended drawings, in which:
  • FIG. 1 is a view in axial vertical section of a part of a motor vehicle headlight fitted with a conventional gas discharge lamp,
  • FIG. 2 is a schematic and partial front view of the projector of FIG. 1,
  • FIG. 3 is a view similar to FIG. 2, showing a lamp fitted according to the present invention,
  • FIG. 4 is a schematic perspective view of a lamp equipped according to the present invention,
  • FIG. 5 is a partial view in vertical section of a projector according to another embodiment of the invention,
  • FIG. 6 is a perspective view of the lamp-concealment unit of the projector of FIG. 5,
  • FIG. 7 is a view from the left of the blanking part of FIG. 6,
  • FIG. 8 is a front view of the concealment piece of FIG. 6,
  • FIG. 9 is a view from the right of the blocking part of FIG. 6, and
  • FIG. 10 is a top view of the concealment piece of FIG. 6.

On a représenté sur la figure 1 un projecteur de véhicule automobile comportant une lampe à décharge gazeuse 10 montée dans un miroir 20.FIG. 1 shows a motor vehicle headlight comprising a gas discharge lamp 10 mounted in a mirror 20.

La lampe comporte, dans un bulbe ou enveloppe en verre 12 de forme générale cylindrique, coaxial avec l'axe optique x-x du miroir, deux électrodes 14a, 14b entre lesquelles peut être amorcé et entretenu, par commande électrique appropriée, un arc électrique lumineux constituant la source lumineuse S du projecteur.The lamp comprises, in a bulb or glass envelope 12 of generally cylindrical shape, coaxial with the optical axis xx of the mirror, two electrodes 14a, 14b between which can be started and maintained, by appropriate electrical control, a luminous electric arc constituting the light source S of the projector.

L'électrode antérieure 14b est reliée au culot 15 de la lampe par un conducteur 16 comportant une branche descendante 16a et une branche généralement horizontale 16b, s'étendant au-dessous du bulbe et parallèlement à l'axe x-x, jusqu'au culot.The front electrode 14b is connected to the base 15 of the lamp by a conductor 16 comprising a descending branch 16a and a generally horizontal branch 16b, extending below the bulb and parallel to the axis x-x, up to the base.

Cette branche horizontale du conducteur 16 est entourée par un manchon en céramique 17, de façon classique.This horizontal branch of the conductor 16 is surrounded by a ceramic sleeve 17, in a conventional manner.

La lampe 10 comporte également un cache de lumière directe 18 relié au culot 15 de la lampe par un support approprié (non représenté) qui est traité de manière à minimiser les réflexions parasites sur celui-ci.The lamp 10 also includes a direct light cover 18 connected to the base 15 of the lamp by an appropriate support (not shown) which is treated so as to minimize parasitic reflections thereon.

En référence maintenant à la figure 2, on observe que le bulbe 12 de la lampe, de façon classique en soi, comporte deux zones opaques 12a, 12b destinées à occulter le rayonnement issu de la source S et qui se dirigerait vers deux zones spécifiques du miroir. Ces zones opaques sont ici en forme de bandes s'étendant parallèlement à l'axe de la lampe, et sont réalisées de préférence en appliquant sur le bulbe une peinture opaque.Referring now to FIG. 2, it can be seen that the bulb 12 of the lamp, conventionally in itself, comprises two opaque zones 12a, 12b intended to obscure the radiation coming from the source S and which would go towards two specific zones of the mirror. These opaque zones are here in the form of bands extending parallel to the axis of the lamp, and are preferably produced by applying an opaque paint to the bulb.

Dans la présente forme de réalisation, l'une de ces zones Z1 couvre, à gauche de la lampe en vue de face, un secteur compris entre un demi-plan horizontal P1 et un demi-plan P2 incliné à 25° sous l'horizontale. L'autre de ces zones Z2 couvre, à droite de la lampe en vue de face, un secteur compris entre un demi-plan P3 incliné à 15° sous l'horizontale et un demi-plan P4 incliné à 40° sous l'horizontale. Ce mode de réalisation particulier n'est bien entendu pas à considérer comme limitatif.In the present embodiment, one of these zones Z1 covers, to the left of the lamp in front view, a sector comprised between a horizontal half-plane P1 and a half-plane P2 inclined at 25 ° below the horizontal . The other of these zones Z2 covers, to the right of the lamp in front view, a sector comprised between a half-plane P3 inclined at 15 ° below the horizontal and a half-plane P4 inclined at 40 ° below the horizontal . This particular embodiment is of course not to be considered as limiting.

Le miroir 20 est en l'espèce un miroir capable de produire par lui-même, sans l'intervention d'une coupelle, un faisceau de croisement européen normalisé, par une conception spécifique telle que décrite dans un certain nombre de brevets antérieurs au nom de la Demanderesse.The mirror 20 is in this case a mirror capable of producing by itself, without the intervention of a cup, a European standard passing beam, by a specific design as described in a certain number of patents prior to the name of the Applicant.

On précisera ici que le masquage effectué par les bandes 12a, 12b a pour objet de parfaire le faisceau lumineux produit par le miroir, en atténuant la lumière dans certaines zones du faisceau et notamment la lumière susceptible, par des imperfections de la surface réfléchissante, de déborder au-dessus de la coupure.It will be specified here that the masking carried out by the strips 12a, 12b is intended to perfect the light beam produced by the mirror, by attenuating the light in certain areas of the beam and in particular the light susceptible, by imperfections of the reflecting surface, to overflow above the cut.

On notera également ici que la forme de réalisation particulière du miroir n'est pas à considérer comme limitative.It will also be noted here that the particular embodiment of the mirror is not to be considered as limiting.

On a également représenté sur la figure 2 le conducteur 16b pourvu de son manchon 17. La réflexion de la lumière issue de la source S sur ce manchon fait que celui-ci constitue une source lumineuse parasite S', éclairant majoritairement vers le haut et vers les côtés. Cette source parasite, en coopération avec le miroir, est susceptible - de par sa position au-dessous de la source S - de donner lieu dans le faisceau engendré à une quantité de lumière non négligeable au-dessus de la coupure recherchée.FIG. 2 also shows the conductor 16b provided with its sleeve 17. The reflection of the light coming from the source S on this sleeve means that the latter constitutes a parasitic light source S ', mainly lighting upwards and towards the sides. This parasitic source, in cooperation with the mirror, is capable - by its position below the source S - of giving rise in the beam generated to a non-negligible amount of light above the desired cut-off.

Une telle lampe peut également donner lieu à d'autres types de sources parasites, et notamment à une source S'' liée à la présence de sels à l'intérieur de l'enveloppe 12 ou des électrodes 14a, 14b.Such a lamp can also give rise to other types of parasitic sources, and in particular to a source S '' linked to the presence of salts inside the envelope 12 or the electrodes 14a, 14b.

Maintenant en référence à la figure 3, on a représenté une lampe selon l'invention, à laquelle sont associés deux occulteurs qui ont pour vocation d'intercepter une partie substantielle du rayonnement issu de la source parasite et qui se dirigerait vers le miroir, et qui ont pour caractéristique de se placer dans les deux zones d'ombre Z1 et Z2 provoquées par les bandes opaques 12a, 12b. De la sorte, ces occulteurs sont sans influence sur la lumière émise par la source S, et donc sur le faisceau engendré par le miroir à partir de ladite source. En outre, en occultant la majeure partie du rayonnement diffusé par la source parasite et susceptible de rencontrer le miroir, ils évitent que ce rayonnement n'engendre dans le faisceau de la lumière au-dessus de la coupure.Now with reference to FIG. 3, there is shown a lamp according to the invention, with which two occulters are associated which are intended to intercept a substantial part of the radiation coming from the parasitic source and which would go towards the mirror, and which have the characteristic of being placed in the two shadow zones Z1 and Z2 caused by the opaque bands 12a, 12b. In this way, these occulters have no influence on the light emitted by the source S, and therefore on the beam generated by the mirror from said source. In addition, by obscuring most of the radiation scattered by the parasitic source and likely to meet the mirror, they prevent this radiation from generating in the beam of light above the cut.

Les occulteurs sont en l'espèce en forme de plaques planes 13a, 13b, par exemple métalliques, qui s'étendent sensiblement radialement à partir du bulbe 12 sur une étendue au moins égale, et de préférence supérieure, à celle de la source parasite S'.The occulters are in this case in the form of flat plates 13a, 13b, for example metallic, which extend substantially radially from the bulb 12 over an extent at least equal to, and preferably greater than, that of the parasitic source S '.

De façon préférée, comme illustré sur la figure 3, ces plaques ne s'étendent pas rigoureusement radialement, mais sont inclinées, de l'intérieur vers l'extérieur, du plan limite supérieur de la zone considérée vers sont plan limite inférieur.Preferably, as illustrated in FIG. 3, these plates do not extend strictly radially, but are inclined, from the inside towards the outside, from the upper limit plane of the zone considered towards their lower limit plane.

Comme illustré sur la figure 4, les occulteurs 13a et 13b peuvent être fixés en place en étant rendus solidaires du cache de lumière directe 18 (par exemple soudés ou sertis), en présentant des décrochements 131a, 131b prolongeant lesdits occulteurs vers l'avant sur une certaine distance de part et d'autre du cache.As illustrated in FIG. 4, the blinds 13a and 13b can be fixed in place by being made integral with the direct light cover 18 (for example welded or crimped), by presenting recesses 131a, 131b extending said blinds forward on a certain distance on either side of the cache.

De façon avantageuse, la face inférieure des plaques d'occultation 13a, 13b comporte un revêtement absorbant la lumière (peinture noire mate ou analogue).Advantageously, the underside of the concealment plates 13a, 13b has a light-absorbing coating (matt black paint or the like).

Selon une variante de réalisation non représentée, les occulteurs 13a, 13b peuvent être fixés directement sur le culot 15 de la lampe.According to a variant embodiment not shown, the occulters 13a, 13b can be fixed directly to the base 15 of the lamp.

Selon une autre variante, telle qu'on va la décrire en détail dans la suite, ce sont les occulteurs 13a, 13b eux-mêmes qui constituent des moyens de montage du cache de lumière directe 18 sur le culot ou sur le miroir, auquel cas les occulteurs sont solidaires du culot ou du miroir à leur extrémité arrière et solidaires du cache 18 à leur extrémité avant.According to another variant, as will be described in detail below, it is the occulters 13a, 13b themselves which constitute means for mounting the direct light cover 18 on the base or on the mirror, in which case the occulters are secured to the base or the mirror at their rear end and secured to the cover 18 at their front end.

Par ailleurs, l'invention s'applique généralement à tout type de lampe comportant, à l'extérieur du bulbe, un ou plusieurs organes, notamment électrodes, susceptibles de constituer des sources parasite, et couvre notamment les lampes dites "HIR" (Halogen Infra Red, dans lesquelles le ballon de la lampe rétro-réfléchit le rayonnement infra-rouge émis par le filament vers ce même filament pour accroître l'excitation lumineuse.Furthermore, the invention generally applies to any type of lamp comprising, outside the bulb, one or more organs, in particular electrodes, capable of constituting parasitic sources, and covers in particular the so-called "HIR" lamps (Halogen Infra Red, in which the balloon of the lamp retro-reflects the infrared radiation emitted by the filament towards this same filament to increase the light excitation.

On a représenté sur les figures 5 à 10 une autre forme de réalisation de la présente invention.Another embodiment of the present invention is shown in Figures 5 to 10.

Sur ces figures, des éléments ou parties identiques ou similaires à ceux des figures précédentes sont désignés dans la mesure du possible par les mêmes signes de référence, et ne seront pas systématiquement décrits à nouveau.In these figures, elements or parts identical or similar to those of the previous figures are designated as far as possible by the same reference signs, and will not be systematically described again.

Ce projecteur comprend une pièce d'occultation qui comporte une partie formant cache de lumière directe 18 avec une paroi supérieure bombée 181, deux parois latérales verticales 182, 183, une paroi inférieure horizontale 186 et une paroi frontale 187. Deux parties en biseau 184, 185 assurent la transition entre les parois latérales et la paroi inférieure.This projector comprises a screening part which comprises a part forming a direct light cover 18 with a curved upper wall 181, two vertical side walls 182, 183, a horizontal lower wall 186 and a front wall 187. Two bevelled parts 184, 185 ensure the transition between the side walls and the bottom wall.

Les bords des parois supérieure, inférieure et latérales à l'opposé de la paroi frontale présentent une géométrie telle que le rayonnement issu de la lampe atteigne seulement les parties utiles du miroir 20.The edges of the upper, lower and lateral walls opposite the front wall have a geometry such that the radiation coming from the lamp only reaches the useful parts of the mirror 20.

Selon cette forme de réalisation, les occulteurs 13a, 13b dont la fonction est identique à celle des occulteurs décrits en référence aux figures 3 et 4, constituent en même temps les moyens de fixation de la partie 18 formant cache de lumière directe sur le miroir 20, si bien qu'aucune pièce additionnelle de fixation telle que patte, montant, etc.., susceptible de diminuer le rendement lumineux et/ou d'engendrer un rayonnement parasite, n'est nécessaire.According to this embodiment, the occluders 13a, 13b whose function is identical to that of the occluders described with reference to FIGS. 3 and 4, at the same time constitute the means for fixing the part 18 forming a mask of direct light on the mirror 20 , so that no additional fixing part such as bracket, upright, etc., likely to reduce the light output and / or generate parasitic radiation, is necessary.

Dans cet exemple de réalisation, chaque occulteur 13a, 13b présente la forme d'une patte s'étendant dans un plan vertical et comportant à son extrémité postérieure:

  • un prolongement à environ 90° vers l'extérieur, respectivement 131a, 131b;
  • un prolongement vers l'arrière, sensiblement parallèle aux occulteurs 13a, 13b, et désigné respectivement par 132a, 132b; et
  • un prolongement terminal à environ 90° vers l'extérieur, respectivement 133a, 133b.
In this exemplary embodiment, each concealer 13a, 13b has the shape of a tab extending in a vertical plane and comprising at its rear end:
  • an extension about 90 ° outward, respectively 131a, 131b;
  • a rearward extension, substantially parallel to the occluders 13a, 13b, and designated respectively by 132a, 132b; and
  • a terminal extension about 90 ° outward, respectively 133a, 133b.

Ces prolongements sont aptes à se verrouiller, après déformation élastique pour leur mise en place, dans deux ouvertures 21a, 21b formées dans le miroir 20 de part et d'autre du trou de lampe.These extensions are capable of locking, after elastic deformation for their establishment, in two openings 21a, 21b formed in the mirror 20 on either side of the lamp hole.

On observera ici que la mise en place de la lampe dans le trou de lampe peut être mise à profit soit pour assurer le montage de la pièce d'occultation sur le miroir, soit pour confirmer le montage effectué par exemple comme décrit ci-dessus, en venant dans ce cas exercer un appui radialement vers l'extérieur au niveau des prolongements 132a, 132b et effectuer un calage axial approprié, pour éviter tout risque de déverrouillage.It will be observed here that the placing of the lamp in the lamp hole can be used either to ensure the mounting of the concealment piece on the mirror, or to confirm the mounting carried out for example as described above, by coming in this case to exert a support radially outwards at the level of the extensions 132a, 132b and perform an appropriate axial setting, to avoid any risk of unlocking.

On peut également prévoir une fixation de la pièce d'occultation sur le miroir par vissage, accrochage à l'aide de griffes, etc...It is also possible to provide a fixing of the concealment piece on the mirror by screwing, hanging using claws, etc.

On peut en outre monter la pièce d'occultation directement sur le culot 15 de la lampe.It is also possible to mount the concealment piece directly on the base 15 of the lamp.

La figure 8 montre la disposition angulaire des occulteurs 13a, 13b pour qu'ils se situent bien dans les zones d'ombre crées par les zones opaques 12a, 12b du bulbe.Figure 8 shows the angular arrangement of the occluders 13a, 13b so that they are well located in the shadow areas created by the opaque areas 12a, 12b of the bulb.

Bien entendu, les parties 13a et 13b de la pièce d'occultation peuvent en variante être orientées non pas verticalement mais avec une inclinaison oblique, comme dans le cas des figures 3 et 4.Of course, the parts 13a and 13b of the concealment piece can alternatively be oriented not vertically but with an oblique inclination, as in the case of FIGS. 3 and 4.

Bien entendu, la présente invention n'est nullement limitée aux formes de réalisation décrites et représentées, mais l'homme de l'art saura y apporter toute variante ou modification conforme à son esprit.Of course, the present invention is in no way limited to the embodiments described and shown, but those skilled in the art will be able to make any variant or modification in accordance with his spirit.

Claims (11)

Projecteur de véhicule automobile, du type comprenant une lampe (10) comportant un bulbe (12) à l'intérieur duquel est formée une source lumineuse (S), et des moyens de connexion ou de support (17) s'étendant à l'extérieur du bulbe sensiblement au droit de la source, un miroir (20) dans lequel est reçue la lampe, et une glace de fermeture, la lampe comportant au voisinage du bulbe au moins un écran (12a, 12b) destiné à occulter une partie du rayonnement issu de la source et qui se dirigerait vers une certaine région du miroir, pour ainsi créer une zone d'ombre homologue (Z1, Z2), le projecteur étant caractérisé en ce qu'il comprend en outre, dans ladite zone d'ombre, un occulteur (13a, 13b) destiné à masquer une région homologue du miroir vis-a-vis d'une source de lumière parasite (S') constituée par la réflexion de la lumière issue de la source sur lesdits moyens de connexion ou de support (17).Motor vehicle headlamp, of the type comprising a lamp (10) comprising a bulb (12) inside which a light source (S) is formed, and connection or support means (17) extending to the exterior of the bulb substantially in line with the source, a mirror (20) in which the lamp is received, and a closing glass, the lamp comprising in the vicinity of the bulb at least one screen (12a, 12b) intended to obscure part of the radiation from the source which would go towards a certain region of the mirror, thereby creating a homologous shadow zone (Z1, Z2), the projector being characterized in that it further comprises, in said shadow zone , a concealer (13a, 13b) intended to mask a region homologous to the mirror vis-à-vis a stray light source (S ') formed by the reflection of the light coming from the source on said means of connection or support (17). Projecteur selon la revendication 1, dans lequel le bulbe de la lampe comporte deux zones opaques (12a, 12b) formant écrans, en forme de bandes généralement parallèles à l'axe (x-x) d'émission du projecteur et créant deux zones d'ombre (Z1, Z2) s'étendant généralement latéralement par rapport à la lampe, et dans lequel ladite source parasite (S') est située au-dessous de la source, caractérisé en ce qu'il comprend deux occulteurs en forme de plaques (13a, 13b) s'étendant généralement radialement dans les zones d'ombre (Z1, Z2) desdites bandes opaques.Projector according to claim 1, in which the bulb of the lamp comprises two opaque zones (12a, 12b) forming screens, in the form of bands generally parallel to the axis (xx) of emission of the projector and creating two shadow zones (Z1, Z2) extending generally laterally with respect to the lamp, and in which said parasitic source (S ') is located below the source, characterized in that it comprises two plate-shaped occluders (13a , 13b) extending generally radially in the shaded areas (Z1, Z2) of said opaque bands. Projecteur selon la revendication 2, caractérisé en ce que lesdits occulteurs en forme de plaques (14a, 14b) s'étendent de façon inclinée vers le bas de part et d'autre de la lampe.Projector according to Claim 2, characterized in that the said plate-shaped occluders (14a, 14b) extend inclined downward on either side of the lamp. Projecteur selon l'une des revendications 1 à 3, dans lequel la lampe comporte un cache de lumière directe (18) en avant de la source, caractérisé en ce que le ou les occulteurs (13a, 13b) sont solidaires dudit cache.Projector according to one of claims 1 to 3, in which the lamp comprises a direct light cover (18) in front of the source, characterized in that the or the occluder (13a, 13b) are integral with said cover. Projecteur selon la revendication 4, caractérisé en ce que le ou les occulteurs (13a, 13b) constituent des moyens de fixation du cache de lumière directe (18) sur le culot (15) de la lampe.Projector according to claim 4, characterized in that the occluder (s) (13a, 13b) constitute means for fixing the direct light cover (18) on the base (15) of the lamp. Projecteur selon la revendication 4, caractérisé en ce que le ou les occulteurs (13a, 13b) constituent des moyens de fixation du cache de lumière directe (18) sur le miroir (20).Projector according to claim 4, characterized in that the or the occluder (13a, 13b) constitute means for fixing the cover of direct light (18) on the mirror (20). Lampe (10) pour projecteur de véhicule automobile, du type comportant un bulbe (12) à l'intérieur duquel est formée une source lumineuse (S), et des moyens de connexion ou de support (17) s'étendant à l'extérieur du bulbe sensiblement au droit de la source, la lampe comportant au moins une zone opaque (12a, 12b) s'étendant au voisinage du bulbe et destinée à occulter une partie du rayonnement issu de la source et qui se dirigerait vers une certaine région d'un miroir associé, pour ainsi créer une zone d'ombre homologue (Z1, Z2), la lampe étant caractérisée en ce qu'elle comprend en outre, dans ladite zone d'ombre, un occulteur (13a, 13b) destiné à intercepter une partie significative du rayonnement issu d'une source de lumière parasite (S') constituée par la réflexion de la lumière issue de la source sur lesdits moyens de connexion ou de support (17).Lamp (10) for a motor vehicle headlamp, of the type comprising a bulb (12) inside which a light source (S) is formed, and connection or support means (17) extending outside of the bulb substantially in line with the source, the lamp comprising at least one opaque zone (12a, 12b) extending in the vicinity of the bulb and intended to obscure part of the radiation originating from the source and which would go towards a certain region of '' an associated mirror, thereby creating a homologous shadow zone (Z1, Z2), the lamp being characterized in that it further comprises, in said shadow zone, a concealer (13a, 13b) intended to intercept a significant part of the radiation from a stray light source (S ') constituted by the reflection of light from the source on said connection or support means (17). Lampe selon la revendication 7, dont le bulbe comporte deux zones opaques en forme de bandes (12a, 12b) généralement parallèles à un axe de la lampe et aptes à créer deux zones d'ombre (Z1, Z2) s'étendant généralement latéralement par rapport à la lampe, et dans laquelle la source parasite (S') est située au-dessous de la source (S), caractérisée en ce qu'elle comprend deux occulteurs en forme de plaques (13a, 13b) s'étendant généralement radialement dans les zones d'ombre desdites bandes opaques.Lamp according to claim 7, the bulb of which comprises two opaque zones in the form of bands (12a, 12b) generally parallel to an axis of the lamp and suitable for create two shadow zones (Z1, Z2) generally extending laterally with respect to the lamp, and in which the parasitic source (S ') is located below the source (S), characterized in that it comprises two plate-shaped occluders (13a, 13b) generally extending radially in the shadow areas of said opaque bands. Lampe selon la revendication 8, caractérisée en ce que lesdits occulteurs en forme de plaques (13a, 13b) s'étendent de façon inclinée vers le bas de part et d'autre du bulbe (12).Lamp according to claim 8, characterized in that said plate-shaped occluders (13a, 13b) extend inclined downward on either side of the bulb (12). Lampe selon l'une des revendications 7 à 9, laquelle comporte un cache de lumière directe (18) en avant de la source, caractérisée en ce que le ou les occulteurs (13a, 13b) sont solidaires dudit cache.Lamp according to one of claims 7 to 9, which comprises a direct light cover (18) in front of the source, characterized in that the or the occluder (13a, 13b) are integral with said cover. Lampe selon la revendication 10, caractérisée en ce que les occulteurs (13a, 13b) constituent des moyens de fixation du cache de lumière directe (18) sur le culot (15) de la lampe.Lamp according to claim 10, characterized in that the occluders (13a, 13b) constitute means for fixing the direct light cover (18) on the base (15) of the lamp.
EP19960401019 1995-05-10 1996-05-10 Motor vehicle headlamp comprising stray light shielding means and lamp including such shielding means Expired - Lifetime EP0742408B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9505514 1995-05-10
FR9505514A FR2734043B1 (en) 1995-05-10 1995-05-10 MOTOR VEHICLE HEADLIGHT COMPRISING MEANS OF OCCULTATION OF INTERFERED LIGHT, AND LAMP PROVIDED WITH SUCH MEANS OF OCCULTATION

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EP0742408A1 true EP0742408A1 (en) 1996-11-13
EP0742408B1 EP0742408B1 (en) 2003-06-25

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EP19960401019 Expired - Lifetime EP0742408B1 (en) 1995-05-10 1996-05-10 Motor vehicle headlamp comprising stray light shielding means and lamp including such shielding means

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DE (1) DE69628787T2 (en)
ES (1) ES2201159T3 (en)
FR (1) FR2734043B1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2308647A (en) * 1995-12-22 1997-07-02 Koito Mfg Co Ltd A vehicular headlamp
CN101871615A (en) * 2009-03-24 2010-10-27 海拉汽车部件奥地利有限公司 Headlamp
DE19947876B4 (en) * 1999-10-05 2012-06-28 Automotive Lighting Reutlingen Gmbh Headlights for vehicles

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4271459A (en) * 1979-01-17 1981-06-02 Lucas Industries Limited Vehicle headlamp assembly
EP0231935A2 (en) * 1986-02-06 1987-08-12 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Dazzle headlight lamp for motor vehicles
DE4302907A1 (en) * 1992-02-05 1993-08-12 Koito Mfg Co Ltd

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4271459A (en) * 1979-01-17 1981-06-02 Lucas Industries Limited Vehicle headlamp assembly
EP0231935A2 (en) * 1986-02-06 1987-08-12 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Dazzle headlight lamp for motor vehicles
DE4302907A1 (en) * 1992-02-05 1993-08-12 Koito Mfg Co Ltd

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2308647A (en) * 1995-12-22 1997-07-02 Koito Mfg Co Ltd A vehicular headlamp
GB2308647B (en) * 1995-12-22 1999-02-17 Koito Mfg Co Ltd Vehicular headlamp
US6132068A (en) * 1995-12-22 2000-10-17 Koito Manufacturing Co., Ltd. Vehicular headlamp having a shade
DE19947876B4 (en) * 1999-10-05 2012-06-28 Automotive Lighting Reutlingen Gmbh Headlights for vehicles
CN101871615A (en) * 2009-03-24 2010-10-27 海拉汽车部件奥地利有限公司 Headlamp
CN101871615B (en) * 2009-03-24 2014-10-15 海拉汽车部件奥地利有限公司 Headlamp

Also Published As

Publication number Publication date
EP0742408B1 (en) 2003-06-25
FR2734043B1 (en) 1997-08-01
DE69628787D1 (en) 2003-07-31
FR2734043A1 (en) 1996-11-15
ES2201159T3 (en) 2004-03-16
DE69628787T2 (en) 2004-05-19

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