EP0905441A1 - Motor vehicle headlamp comprising a discharge lamp and improved electromagnetic shielding means - Google Patents

Motor vehicle headlamp comprising a discharge lamp and improved electromagnetic shielding means

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Publication number
EP0905441A1
EP0905441A1 EP98402349A EP98402349A EP0905441A1 EP 0905441 A1 EP0905441 A1 EP 0905441A1 EP 98402349 A EP98402349 A EP 98402349A EP 98402349 A EP98402349 A EP 98402349A EP 0905441 A1 EP0905441 A1 EP 0905441A1
Authority
EP
European Patent Office
Prior art keywords
lamp
cap
projector according
mirror
connector
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP98402349A
Other languages
German (de)
French (fr)
Other versions
EP0905441B1 (en
Inventor
Alexis Dubrovin
Gérard Billot
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Vision SAS
Original Assignee
Valeo Vision SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valeo Vision SAS filed Critical Valeo Vision SAS
Publication of EP0905441A1 publication Critical patent/EP0905441A1/en
Application granted granted Critical
Publication of EP0905441B1 publication Critical patent/EP0905441B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V25/00—Safety devices structurally associated with lighting devices
    • 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
    • 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
    • F21S41/19—Attachment of light sources or lamp holders
    • F21S41/192—Details of lamp holders, terminals or connectors

Definitions

  • the present invention relates generally to motor vehicle headlamps equipped with a discharge lamp
  • Discharge lamps in particular of the halide type metallic (typically sodium iodide) are increasingly frequently used as light sources in such spotlights.
  • halide type metallic typically sodium iodide
  • a projector of motor vehicle which comprises in particular, for carrying out the shielding of a discharge lamp, a shielding plate (14) mounted on the projector housing behind the mirror receiving the lamp discharge, so as to minimize rearward disturbances.
  • This plate extends freely in the interior space of the case, between the latter and the mirror.
  • the plate provided in this document must have a relatively large central opening for access to the lamp, and rear cap (7) of the headlamp must then be metallized to complete the shielding, which further adds to cost and can be tricky if the cap is a soft elastomer cap or the like.
  • the present invention aims to propose a vehicle headlamp automobile equipped with a discharge lamp and shielding means improved in particular at the level of the arc of the lamp, which are simple construction and implementation, which does not present not the aforementioned drawbacks.
  • the invention proposes for this purpose a vehicle headlamp automobile, comprising a mirror in which a lamp is mounted discharge, a blackout placed in front of the lamp and a plate shielding of conductive material extending behind the mirror, the screen being made of conductive material being connected to a fixed potential for picking up stray electromagnetic fields emitted at the level of the lamp towards the front, headlight characterized in that the armor plate is constituted by a cap extending in back and along the mirror and connected to said fixed potential.
  • FIG. 1 is a schematic view in partial axial vertical section of part of a projector according to the invention.
  • a motor vehicle headlamp so comprises classic a case closed at the front by a crystal and defining a interior space. These elements were not represented on the drawings for the sake of simplification.
  • a mirror 20 In the interior space of the housing is housed a mirror 20 in which is mounted a discharge lamp 10, conventionally per se.
  • the lamp 10 has two electrodes housed in a bulb 11, with an external current return conductor 12.
  • the lamp bears against the rear of the mirror 20 by a radial flange 13, extended backwards by a base 14 for its connection with a power supply.
  • the mirror 20 has a lamp hole 21 surrounded by a axial flange 22 for setting the lamp transversely to its axis.
  • a plurality of screwing barrels 23 extending parallel to the axis of the projector.
  • a concealer 30 intended on the one hand to limit the emission field of the arc of the lamp 10 so that it reaches only the useful regions of the mirror 20, and at obscure direct light.
  • This concealer has a kind of bell 31 fixed, as is will see in detail later, by at least one arm 32 passing through an orifice or a notch formed in the mirror in the vicinity of the lamp 10.
  • the screen and its support arm are made by folding metal sheet.
  • These means essentially include the combination of the screen 30 described above, made of conductive material, and a cap 40, also made of conductive material, which extends behind and in the vicinity of the reflecting surface of the mirror 20.
  • this cap 40 is determined advantageously so that in combination with the contours of the screen 30, these two elements cover the entire solid angle emission centered on the arc of the lamp 10.
  • the cap 40 is made of a stamped thin metal sheet, which is applied during mounting substantially against the rear face of the mirror 20.
  • the cap 40 is incorporated in the mirror, the latter being produced by overmolding of thermosetting material on the cap.
  • it can be a film of conductive material projected against the rear face of the mirror, by sputtering or the like, or alternatively conductive paint with aluminum, nickel-chromium, copper, ..., possibly coated with a protective varnish.
  • the cap 40 is interrupted at a level central opening to allow the introduction of the lamp 10 into the mirror 20.
  • the cap 40 produced in the present example in sheet metal stamped, has a tab 41 whose free end 42 forms a lug intended to be applied against said plate 50 at the level of the screw 60 engaged in one of the barrels 23 of the mirror 20.
  • This plate 50 has a central opening for the passage of lamp base 14 and high-voltage connector associated, as will be described later.
  • a specific conductive part can be provided for the connection between the cover 40 and the plate 50, or else provide that the cover and the plate are made in one piece.
  • the high-voltage connector 80 is of the conventional type in itself. he is equipped at its periphery with one or more flexible legs 82 in conductive material, intended to come into contact with the surface back of the plate 50 during the fitting of the connector.
  • the tab 32 for maintaining the screen 30 is folded at its free end at 33 to be in contact with the front face of the plate 50, at one of the screwing barrels 23, the screw 60 cooperating with this barrel ensuring the maintaining said plate and said fold 33 in mutual contact.
  • a means is also provided for provide shielding at the generally annular gap which separates the connector from the radial flange 13 of the lamp.
  • this plea consists of an annular bead of preferably flexible conductive material, for example a braid 85, the dimensions of which are chosen so that it fills most of the aforementioned gap.
  • This braid 85 is connected to ground for example using a lug 43 integral with the shielding cap 40 and extending radially inwards from said cap, to reach the braided.
  • any other type of connection of the annular conductive element 85 with one or other of the different grounded parts can be any other type of connection of the annular conductive element 85 with one or other of the different grounded parts.
  • first part of the cap 40, second part of the shield 30 and third part of connector 80 which define a set of capture of the electromagnetic fields emitted by the lamp, which here is connected to the vehicle ground by the shield of the high-voltage cable 92 connecting connector 80 to the ballast circuit (housed in the armored box 100).
  • the shielding of the power cable to high-voltage 92 is in contact, within the connector 80, with the or the conductive elements 82 equipping this connector.
  • the connector 80 will be covered with a cover in conductive material, on the one hand in contact with the cable shield 92 and on the other hand with the plate 50, or directly with the cap 40.
  • the plate 50 in the form of a crown fills also a mechanical function for fixing the lamp 10, so similar to the case of filament lamps.
  • the plate 50 comprises, conventionally in itself, arrangements 51, 52 for the articulated mounting and the attachment of a fixing spring pin 70, of which a central part is supported elastically against the rear face of the flange 13 of the lamp 10.
  • ballast 100 box to which the shielding of the high-voltage conductor 92, and if necessary the braid of specific mass 90, are connected to the mass of the on-board network 110 of the vehicle.
  • the invention applies equally well to projectors of parabolic type, that is to say whose mirror, in cooperation possible with the ice, generates the beam itself, only elliptical type headlamps, having a projection lens a concentrated light spot formed in a second focus of the mirror.

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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)

Abstract

The motor vehicle headlamp has a reflector (20) inside which is mounted a discharge lamp (10), a screen (30) placed immediately in front of the lamp, and a shielding coating (40) made of a conductive material covering the back of the reflector. The shielding is connected to a fixed potential. The lamp screen (30) is made of a conductive material and is also connected to a fixed potential to divert stray electromagnetic fields emitted toward the front of the lamp.

Description

La présente invention a trait d'une façon générale aux projecteurs de véhicules automobiles équipés d'une lampe à déchargeThe present invention relates generally to motor vehicle headlamps equipped with a discharge lamp

Les lampes à décharge notamment du type à halogénure métallique (typiquement iodure de sodium) sont de plus en plus fréquemment utilisées comme sources lumineuses dans de tels projecteurs.Discharge lamps, in particular of the halide type metallic (typically sodium iodide) are increasingly frequently used as light sources in such spotlights.

Elles jouissent en effet de l'avantage appréciable de pouvoir, à puissance consommée comparable, fournir une intensité lumineuse bien plus importante que dans le cas des lampes à filament à halogène classiques.They indeed enjoy the appreciable advantage of power, comparable power consumption, provide light intensity much more important than in the case of halogen filament lamps classics.

Ces lampes présentent toutefois l'inconvénient d'engendrer, au niveau de leur arc, des champs électromagnétiques qui posent un grave problème vis-à-vis des exigences de compatibilité électromagnétique, tant en émission qu'en réception, généralement imposées par les cahiers des charges. On observera à cet égard que, par le développement des circuits électroniques assurant certaines fonctions de sécurité à bord d'un véhicule, ces exigences sont aujourd'hui de plus en plus sévères.However, these lamps have the disadvantage of generating, level of their arc, electromagnetic fields that pose a serious problem with compatibility requirements electromagnetic, both in transmission and in reception, generally imposed by the specifications. It will be observed in this regard that, by the development of electronic circuits ensuring certain safety functions in a vehicle, these requirements are today more and more severe.

Il existe certes des dispositions pour blinder autant que possible une lampe à décharge et ses circuits d'alimentation, mais de telles dispositions généralement sont incompatibles avec l'environnement spécifique d'un projecteur de véhicule automobile. Ainsi par exemple, il est impossible de disposer l'ensemble du projecteur dans une cage de Faraday l'entourant complètement, car il est nécessaire de laisser libre la région de sortie de lumière au niveau de la glace.There are certainly provisions to shield as much as possible a discharge lamp and its supply circuits, but such provisions generally are incompatible with the environment specific to a motor vehicle headlamp. So for example, it it is impossible to place the entire projector in a cage Faraday surrounding it completely, because it is necessary to leave free the region of light output at ice level.

On connaít par le document DE 197 03 233 A un projecteur de véhicule automobile qui comprend notamment, pour réaliser le blindage d'une lampe à décharge, une plaque de blindage (14) montée sur le boítier du projecteur en arrière du miroir recevant la lampe à décharge, de manière à minimiser les perturbations vers l'arrière. Cette plaque s'étend librement dans l'espace intérieur du boítier, entre ce dernier et le miroir.We know from document DE 197 03 233 A projector of motor vehicle which comprises in particular, for carrying out the shielding of a discharge lamp, a shielding plate (14) mounted on the projector housing behind the mirror receiving the lamp discharge, so as to minimize rearward disturbances. This plate extends freely in the interior space of the case, between the latter and the mirror.

Cette solution présente toutefois certains inconvénients. Tout d'abord, elle complique le montage du projecteur, car il est nécessaire de procéder au montage et à la fixation de la plaque sur le boítier avant de monter le réflecteur. En outre, sur les figures simplifiées (en particulier figures 3 et 4) de ce document, on n'a pas représenté des détails tels que les moyens de montage du miroir dans le boítier, les moyens de réglage manuel ou automatique de l'orientation du miroir pour ajuster la position du faisceau lumineux, etc. Et la figure 5, qui représente ce genre de détail, ne montre plus la plaque de blindage arrière. On comprend que la mise en oeuvre simultanée de cette plaque de blindage et des moyens précités sera délicate risque de nécessiter un accroissement de l'encombrement du projecteur et/ou de laisser la plaque de blindage interrompue par endroits, ce qui affecte la qualité du blindage.However, this solution has certain drawbacks. All first, it complicates the mounting of the projector, because it is necessary to proceed to the assembly and the fixing of the plate on the case before mounting the reflector. In addition, in the simplified figures (in particular Figures 3 and 4) of this document, we have not shown details such as the means of mounting the mirror in the housing, the means for manual or automatic adjustment of the orientation of the mirror to adjust the position of the light beam, etc. And Figure 5, which represents this kind of detail, no longer shows the armor plate back. We understand that the simultaneous implementation of this plate shielding and the aforementioned means will be delicate risk of requiring an increase in the size of the projector and / or leaving the armor plate interrupted in places, which affects the quality shielding.

En outre, la plaque prévue dans ce document doit posséder une ouverture centrale relativement grande pour l'accès à la lampe, et le capuchon arrière (7) du projecteur doit alors être métallisé pour compléter le blindage, ce qui ajoute encore au coût de revient et peut s'avérer délicat si le capuchon est un capuchon souple en élastomère ou analogue.In addition, the plate provided in this document must have a relatively large central opening for access to the lamp, and rear cap (7) of the headlamp must then be metallized to complete the shielding, which further adds to cost and can be tricky if the cap is a soft elastomer cap or the like.

La présente invention vise à proposer un projecteur de véhicule automobile équipé d'une lampe à décharge et de moyens de blindage perfectionnés en particulier au niveau de l'arc de la lampe, qui soient d'une construction et d'une mise en oeuvre simples, qui ne présente pas les inconvénients précités.The present invention aims to propose a vehicle headlamp automobile equipped with a discharge lamp and shielding means improved in particular at the level of the arc of the lamp, which are simple construction and implementation, which does not present not the aforementioned drawbacks.

L'invention propose à cet effet un projecteur de véhicule automobile, comprenant un miroir dans lequel est montée une lampe à décharge, un occulteur placé en avant de la lampe et une plaque de blindage en matériau conducteur s'étendant en arrière du miroir, l'occulteur étant réalisé en matériau conducteur étant relié à un potentiel fixe pour capter les champs électromagnétiques parasites émis au niveau de la lampe vers l'avant, projecteur caractérisé en ce que la plaque de blindage est constituée par une coiffe s'étendant en arrière et le long du miroir et reliée audit potentiel fixe.The invention proposes for this purpose a vehicle headlamp automobile, comprising a mirror in which a lamp is mounted discharge, a blackout placed in front of the lamp and a plate shielding of conductive material extending behind the mirror, the screen being made of conductive material being connected to a fixed potential for picking up stray electromagnetic fields emitted at the level of the lamp towards the front, headlight characterized in that the armor plate is constituted by a cap extending in back and along the mirror and connected to said fixed potential.

Des aspects préférés, mais non limitatifs, du projecteur selon l'invention sont les suivants :

  • la coiffe de blindage est dimensionnée de façon à couvrir sensiblement tout l'angle solide, centré sur l'arc de la lampe, non couvert par l'occulteur.
  • ladite coiffe est constituée par une tôle conductrice plaquée contre l'arrière du miroir.
  • ladite coiffe est réalisée par application d'un revêtement sur la face arrière du miroir.
  • ladite coiffe est incorporée au miroir, ce dernier étant réalisé par surmoulage sur la coiffe.
  • le projecteur comprend un élément de liaison électrique fixé en arrière du miroir au voisinage de la lampe, auquel sont reliés électriquement ladite coiffe et ledit occulteur, et qui est lui-même relié électriquement à la masse du véhicule.
  • sur ledit élément de liaison est monté un moyen de retenue de la lampe.
  • le projecteur comprend en outre un connecteur à haute-tension pour l'alimentation de la lampe, et ledit connecteur comporte au moins un élément conducteur apte à venir en contact avec ledit élément de liaison lors de la mise en place du connecteur.
  • ledit élément de liaison est relié à la masse du véhicule par l'intermédiaire du ou des éléments conducteurs et d'un blindage d'un câble d'alimentation de la lampe, relié au connecteur.
  • le projecteur comprend en outre un élément conducteur généralement annulaire situé au droit d'un interstice entre le connecteur et une collerette de la lampe.
  • ledit élément conducteur est souple.
  • ledit élément conducteur est relié à la coiffe par une patte réalisée d'un seul tenant avec ladite coiffe.
  • l'occulteur est relié électriquement à la coiffe par l'intermédiaire d'au moins une patte conductrice de montage dudit occulteur.
Preferred, but not limiting, aspects of the projector according to the invention are as follows:
  • the shielding cap is dimensioned so as to cover substantially the entire solid angle, centered on the arc of the lamp, not covered by the shield.
  • said cap is constituted by a conductive sheet pressed against the rear of the mirror.
  • said cap is produced by applying a coating to the rear face of the mirror.
  • said cap is incorporated into the mirror, the latter being produced by overmolding on the cap.
  • the headlamp comprises an electrical connection element fixed behind the mirror in the vicinity of the lamp, to which said cap and said concealer are electrically connected, and which is itself electrically connected to the ground of the vehicle.
  • on said connecting element is mounted a lamp retaining means.
  • the projector further comprises a high-voltage connector for supplying the lamp, and said connector comprises at least one conductive element capable of coming into contact with said connecting element when the connector is put in place.
  • said connecting element is connected to the vehicle ground via the conductive element (s) and a shield of a lamp power cable, connected to the connector.
  • the projector further comprises a generally annular conductive element located at the right of a gap between the connector and a flange of the lamp.
  • said conductive element is flexible.
  • said conductive element is connected to the cap by a tab made in one piece with said cap.
  • the concealer is electrically connected to the cover by means of at least one conductive mounting tab for said concealer.

D'autres aspects, buts et avantages de la présente invention apparaítront mieux à la lecture de la description détaillée suivante d'une forme de réalisation préférée de celle-ci, donnée à titre d'exemple et faite en référence au dessin annexé, sur lequel la figure 1 est une vue schématique en coupe verticale axiale partielle d'une partie d'un projecteur selon l'invention.Other aspects, objects and advantages of the present invention will appear better on reading the following detailed description of a preferred embodiment thereof, given by way of example and made with reference to the accompanying drawing, in which FIG. 1 is a schematic view in partial axial vertical section of part of a projector according to the invention.

Un projecteur de véhicule automobile comprend de façon classique un boítier fermé à l'avant par une glace et définissant un espace intérieur. Ces éléments n'ont pas été représentés sur les dessins par souci de simplification.A motor vehicle headlamp so comprises classic a case closed at the front by a crystal and defining a interior space. These elements were not represented on the drawings for the sake of simplification.

Dans l'espace intérieur du boítier est logé un miroir 20 dans lequel est montée une lampe à décharge 10, de façon classique en soi.In the interior space of the housing is housed a mirror 20 in which is mounted a discharge lamp 10, conventionally per se.

La lampe 10 comporte deux électrodes logées dans un bulbe 11, avec un conducteur extérieur 12 de retour de courant. La lampe s'appuie contre l'arrière du miroir 20 par une collerette radiale 13, prolongée vers l'arrière par un culot 14 pour sa connexion avec une source d'alimentation. The lamp 10 has two electrodes housed in a bulb 11, with an external current return conductor 12. The lamp bears against the rear of the mirror 20 by a radial flange 13, extended backwards by a base 14 for its connection with a power supply.

Le miroir 20 comporte un trou de lampe 21 entouré par une collerette axiale 22 pour le calage de la lampe transversalement à son axe.The mirror 20 has a lamp hole 21 surrounded by a axial flange 22 for setting the lamp transversely to its axis.

A partir de la face postérieure du miroir sont prévus, par exemple venus de moulage, une pluralité de canons de vissage 23 s'étendant parallèlement à l'axe du projecteur.From the rear side of the mirror are provided, by example from molding, a plurality of screwing barrels 23 extending parallel to the axis of the projector.

Il est prévu par ailleurs, de façon classique, un occulteur 30 destiné d'une part à limiter le champ d'émission de l'arc de la lampe 10 pour qu'il atteigne uniquement les régions utiles du miroir 20, et à occulter la lumière directe.In addition, there is conventionally provided a concealer 30 intended on the one hand to limit the emission field of the arc of the lamp 10 so that it reaches only the useful regions of the mirror 20, and at obscure direct light.

Cet occulteur comporte un genre de cloche 31 fixé, comme on le verra en détail plus loin, par au moins un bras 32 traversant un orifice ou une encoche formé dans le miroir au voisinage de la lampe 10.This concealer has a kind of bell 31 fixed, as is will see in detail later, by at least one arm 32 passing through an orifice or a notch formed in the mirror in the vicinity of the lamp 10.

L'occulteur et son bras de maintien sont réalisés par pliage de tôle métallique.The screen and its support arm are made by folding metal sheet.

On va maintenant décrire en détail des moyens, qui permettent d'assurer un blindage vis-à-vis du rayonnement électromagnétique émis par la lampe 10 notamment au niveau de son arc.We will now describe in detail the means which allow shielding against electromagnetic radiation emitted by the lamp 10 in particular at the level of its arc.

Ces moyens comprennent, pour l'essentiel, la combinaison de l'occulteur 30 décrit ci-dessus, réalisé en matériau conducteur, et d'une coiffe 40, réalisée également en matériau conducteur, qui s'étend en arrière et au voisinage de la surface réfléchissante du miroir 20.These means essentially include the combination of the screen 30 described above, made of conductive material, and a cap 40, also made of conductive material, which extends behind and in the vicinity of the reflecting surface of the mirror 20.

Les contours de cette coiffe 40 sont déterminés avantageusement pour qu'en combinaison avec les contours de l'occulteur 30, ces deux éléments couvrent l'ensemble de l'angle solide d'émission centré sur l'arc de la lampe 10.The contours of this cap 40 are determined advantageously so that in combination with the contours of the screen 30, these two elements cover the entire solid angle emission centered on the arc of the lamp 10.

Dans une première forme de réalisation, la coiffe 40 est constituée d'une tôle métallique mince emboutie, qui est appliquée lors du montage sensiblement contre la face postérieure du miroir 20. In a first embodiment, the cap 40 is made of a stamped thin metal sheet, which is applied during mounting substantially against the rear face of the mirror 20.

Dans une seconde forme de réalisation, la coiffe 40 est incorporée au miroir, ce dernier étant fabriqué par surmoulage de matériau thermodurcissable sur la coiffe.In a second embodiment, the cap 40 is incorporated in the mirror, the latter being produced by overmolding of thermosetting material on the cap.

Dans une troisième forme de réalisation, il peut s'agir d'une pellicule de matériau conducteur projetée contre la face postérieure du miroir, par pulvérisation cathodique ou analogue, ou encore d'une peinture conductrice à l'aluminium, au nickel-chrome, au cuivre,..., éventuellement revêtue d'un vernis protecteur.In a third embodiment, it can be a film of conductive material projected against the rear face of the mirror, by sputtering or the like, or alternatively conductive paint with aluminum, nickel-chromium, copper, ..., possibly coated with a protective varnish.

Dans tous les cas, la coiffe 40 est interrompue au niveau d'une ouverture centrale pour permettre l'introduction de la lampe 10 dans le miroir 20.In all cases, the cap 40 is interrupted at a level central opening to allow the introduction of the lamp 10 into the mirror 20.

La liaison électrique entre les divers éléments participant au blindage est réalisée à l'aide d'une plaque conductrice 50 en forme générale de couronne rapportée sur les canons de vissage 23 du miroir. Ainsi la coiffe 40, réalisée dans le présent exemple en tôle emboutie, comporte une patte 41 dont l'extrémité libre 42 forme une cosse destinée à être appliquée contre ladite plaque 50 au niveau de la vis 60 engagée dans l'un des canons 23 du miroir 20.The electrical connection between the various elements participating in the shielding is carried out using a conductive plate 50 in the form crown general reported on the screwing barrels 23 of the mirror. Thus the cap 40, produced in the present example in sheet metal stamped, has a tab 41 whose free end 42 forms a lug intended to be applied against said plate 50 at the level of the screw 60 engaged in one of the barrels 23 of the mirror 20.

Cette plaque 50 comporte une ouverture centrale pour le passage du culot 14 de la lampe et du connecteur haute-tension associé, tel qu'on le décrira plus loin.This plate 50 has a central opening for the passage of lamp base 14 and high-voltage connector associated, as will be described later.

En variante, on peut prévoir une pièce conductrice spécifique pour le raccordement entre la coiffe 40 et la plaque 50, ou encore prévoir que la coiffe et la plaque soient réalisées d'une seule pièce.Alternatively, a specific conductive part can be provided for the connection between the cover 40 and the plate 50, or else provide that the cover and the plate are made in one piece.

Le connecteur haute-tension 80 est de type classique en soi. Il est équipé à sa périphérie d'une ou de plusieurs pattes flexibles 82 en matériau conducteur, destinées à venir en contact avec la surface postérieure de la plaque 50 lors de la mise en place du connecteur.The high-voltage connector 80 is of the conventional type in itself. he is equipped at its periphery with one or more flexible legs 82 in conductive material, intended to come into contact with the surface back of the plate 50 during the fitting of the connector.

Par ailleurs, on observe que la patte 32 de maintien de l'occulteur 30 est repliée à son extrémité libre en 33 pour être en contact avec la face antérieure de la plaque 50, au niveau de l'un des canons de vissage 23, la vis 60 coopérant avec ce canon assurant le maintien en contact mutuel de ladite plaque et dudit repli 33.Furthermore, it is observed that the tab 32 for maintaining the screen 30 is folded at its free end at 33 to be in contact with the front face of the plate 50, at one of the screwing barrels 23, the screw 60 cooperating with this barrel ensuring the maintaining said plate and said fold 33 in mutual contact.

Avantageusement, il est également prévu un moyen pour assurer un blindage au niveau de l'interstice généralement annulaire qui sépare le connecteur de la collerette radiale 13 de la lampe.Advantageously, a means is also provided for provide shielding at the generally annular gap which separates the connector from the radial flange 13 of the lamp.

En l'espèce, ce moyen consiste en un cordon annulaire de matériau conducteur préférentiellement souple, par exemple une tresse 85, dont les dimensions sont choisies pour qu'elle remplisse l'essentiel de l'interstice précité.In the present case, this plea consists of an annular bead of preferably flexible conductive material, for example a braid 85, the dimensions of which are chosen so that it fills most of the aforementioned gap.

Cette tresse 85 est reliée à la masse par exemple à l'aide d'une patte 43 venue de matière avec la coiffe de blindage 40 et s'étendant radialement vers l'intérieur à partir de ladite coiffe, pour atteindre la tresse.This braid 85 is connected to ground for example using a lug 43 integral with the shielding cap 40 and extending radially inwards from said cap, to reach the braided.

Alternativement, on peut prévoir tout autre type de connexion de l'élément conducteur annulaire 85 avec l'une ou l'autre des différentes parties se trouvant à la masse.Alternatively, any other type of connection of the annular conductive element 85 with one or other of the different grounded parts.

Ainsi on réalise la mise en contact électrique mutuel, de première part de la coiffe 40, de seconde part de l'occulteur 30 et de troisième part du connecteur 80, qui définissent un ensemble de captation des champs électromagnétiques émis par la lampe, qui ici est raccordé à la masse du véhicule par le blindage du câble haute-tension 92 reliant le connecteur 80 au circuit ballast (logé dans le boítier blindé 100).Thus, mutual electrical contact is made, first part of the cap 40, second part of the shield 30 and third part of connector 80, which define a set of capture of the electromagnetic fields emitted by the lamp, which here is connected to the vehicle ground by the shield of the high-voltage cable 92 connecting connector 80 to the ballast circuit (housed in the armored box 100).

On observera ici que le blindage du câble d'alimentation à haute-tension 92 est en contact, au sein du connecteur 80, avec le ou les éléments conducteurs 82 équipant ce connecteur. En variante, on peut prévoir que le connecteur 80 sera recouvert d'un couvercle en matériau conducteur, en contact d'une part avec le blindage du câble 92 et d'autre part avec la plaque 50, ou directement avec la coiffe 40. It will be observed here that the shielding of the power cable to high-voltage 92 is in contact, within the connector 80, with the or the conductive elements 82 equipping this connector. Alternatively, we may provide that the connector 80 will be covered with a cover in conductive material, on the one hand in contact with the cable shield 92 and on the other hand with the plate 50, or directly with the cap 40.

Par ailleurs, la plaque 50 en forme de couronne remplit également une fonction mécanique de fixation de la lampe 10, de façon analogue au cas des lampes à filament.Furthermore, the plate 50 in the form of a crown fills also a mechanical function for fixing the lamp 10, so similar to the case of filament lamps.

Ainsi la plaque 50 comporte, de façon classique en soi, des aménagements 51, 52 pour le montage articulé et l'accrochage d'une épingle-ressort de fixation 70, dont une partie centrale vient s'appuyer élastiquement contre la face postérieure de la collerette 13 de la lampe 10.Thus the plate 50 comprises, conventionally in itself, arrangements 51, 52 for the articulated mounting and the attachment of a fixing spring pin 70, of which a central part is supported elastically against the rear face of the flange 13 of the lamp 10.

Bien entendu, on peut prévoir, en remplacement de la fixation par vis 60, tout autre moyen de fixation de la plaque 50 sur l'arrière du miroir 20, et notamment un montage par sertissage, par griffage, par mécanisme à baïonnette, etc.Of course, provision can be made to replace the fixing by screw 60, any other means of fixing the plate 50 on the rear of the mirror 20, and in particular an assembly by crimping, by clawing, by bayonet mechanism, etc.

Pour terminer, le boítier du ballast 100, auquel est relié le blindage du conducteur haute-tension 92, et le cas échéant la tresse de masse spécifique 90, sont reliés à la masse du réseau de bord 110 du véhicule.Finally, the ballast 100 box, to which the shielding of the high-voltage conductor 92, and if necessary the braid of specific mass 90, are connected to the mass of the on-board network 110 of the vehicle.

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

En particulier, l'invention s'applique aussi bien aux projecteurs de type parabolique, c'est-à-dire dont le miroir, en coopération éventuelle avec la glace, engendre lui-même le faisceau, qu'aux projecteurs de type elliptique, comportant une lentille de projection d'une tache lumineuse concentrée formée en un second foyer du miroir.In particular, the invention applies equally well to projectors of parabolic type, that is to say whose mirror, in cooperation possible with the ice, generates the beam itself, only elliptical type headlamps, having a projection lens a concentrated light spot formed in a second focus of the mirror.

Claims (13)

Projecteur de véhicule automobile, comprenant un miroir (20) dans lequel est montée une lampe à décharge (10), un occulteur (30) placé en avant de la lampe et une plaque de blindage (40) en matériau conducteur s'étendant en arrière du miroir, l'occulteur (30) étant réalisé en matériau conducteur étant relié à un potentiel fixe pour capter les champs électromagnétiques parasites émis au niveau de la lampe vers l'avant, projecteur caractérisé en ce que la plaque de blindage est constituée par une coiffe s'étendant en arrière et le long du miroir et reliée audit potentiel fixe.Motor vehicle headlamp, comprising a mirror (20) in which is mounted a discharge lamp (10), a concealer (30) placed in front of the lamp and a shielding plate (40) in conductive material extending behind the mirror, the shield (30) being made of conductive material being connected to a fixed potential to capture the stray electromagnetic fields emitted at the level of the lamp towards the front, headlamp characterized in that the plate shielding consists of a cap extending back and along of the mirror and connected to said fixed potential. Projecteur selon la revendication 1, caractérisé en ce que la coiffe de blindage (40) est dimensionnée de façon à couvrir sensiblement tout l'angle solide, centré sur l'arc de la lampe (10), non couvert par l'occulteur (30).Projector according to claim 1, characterized in that the shielding cap (40) is dimensioned so as to cover substantially the entire solid angle, centered on the arc of the lamp (10), not covered by the concealer (30). Projecteur selon l'une des revendications 1 et 2, caractérisé en ce que ladite coiffe (40) est constituée par une tôle conductrice plaquée contre l'arrière du miroir (20).Projector according to either of Claims 1 and 2, characterized in that said cap (40) consists of a sheet conductor pressed against the rear of the mirror (20). Projecteur selon l'une des revendications 1 et 2, caractérisé en ce que ladite coiffe (40) est réalisée par application d'un revêtement sur la face arrière du miroir (20).Projector according to either of Claims 1 and 2, characterized in that said cap (40) is produced by applying a coating on the rear face of the mirror (20). Projecteur selon l'une des revendications 1 et 2, caractérisé en ce que ladite coiffe (40) est incorporée au miroir (20), ce dernier étant réalisé par surmoulage sur la coiffe. Projector according to either of Claims 1 and 2, characterized in that said cap (40) is incorporated into the mirror (20), this the latter being produced by overmolding on the cap. Projecteur selon l'une des revendications 1 à 5, caractérisé en ce qu'il comprend un élément de liaison électrique (50) fixé en arrière du miroir au voisinage de la lampe (10), auquel sont reliés électriquement ladite coiffe (40) et ledit occulteur (30), et qui est lui-même relié électriquement à la masse du véhicule.Projector according to one of claims 1 to 5, characterized in that it comprises an electrical connection element (50) fixed in rear of the mirror in the vicinity of the lamp (10), to which are connected electrically said cap (40) and said concealer (30), and which is itself electrically connected to the vehicle ground. Projecteur selon la revendication 6, caractérisé en ce que sur ledit élément de liaison (50) est monté un moyen (70) de retenue de la lampe.Projector according to claim 6, characterized in that on said connecting element (50) is mounted a means (70) for retaining the lamp. Projecteur selon l'une des revendications 6 et 7, caractérisé en ce qu'il comprend en outre un connecteur à haute-tension (80) pour l'alimentation de la lampe, et en ce que ledit connecteur comporte au moins un élément conducteur (82) apte à venir en contact avec ledit élément de liaison (50) lors de la mise en place du connecteur (80).Projector according to either of Claims 6 and 7, characterized in that it further comprises a high-voltage connector (80) for supplying the lamp, and in that said connector comprises at least one conductive element (82) capable of come into contact with said connecting element (50) when setting connector place (80). Projecteur selon la revendication 8, caractérisé en ce que ledit élément de liaison (50) est relié à la masse du véhicule par l'intermédiaire du ou des éléments conducteurs (82) et d'un blindage d'un câble (92) d'alimentation de la lampe, relié au connecteur.Projector according to claim 8, characterized in that said connecting element (50) is connected to the ground of the vehicle by through the conductive element (s) (82) and a shield a cable (92) for supplying the lamp, connected to the connector. Projecteur selon l'une des revendications 8 et 9, caractérisé en ce qu'il comprend en outre un élément conducteur généralement annulaire (85) situé au droit d'un interstice entre le connecteur (80) et une collerette (13) de la lampe.Projector according to either of Claims 8 and 9, characterized in that it further comprises a conductive element generally annular (85) located to the right of a gap between the connector (80) and a flange (13) of the lamp. Projecteur selon la revendication 10, caractérisé en ce que ledit élément conducteur (85) est souple. Projector according to claim 10, characterized in that said conductive element (85) is flexible. Projecteur selon l'une des revendications 10 et 11, caractérisé en ce que ledit élément conducteur (85) est relié à la coiffe (40) par une patte (43) réalisée d'un seul tenant avec ladite coiffe.Projector according to one of claims 10 and 11, characterized in that said conductive element (85) is connected to the cap (40) by a lug (43) made in one piece with said cap. Projecteur selon l'une des revendications 1 à 12, caractérisé en ce que l'occulteur (30) est relié électriquement à la coiffe (40) par l'intermédiaire d'au moins une patte conductrice (32) de montage dudit occulteur.Projector according to one of claims 1 to 12, characterized in that the shield (30) is electrically connected to the cover (40) via at least one conductive tab (32) of mounting of said concealer.
EP98402349A 1997-09-26 1998-09-24 Motor vehicle headlamp comprising a discharge lamp and improved electromagnetic shielding means Expired - Lifetime EP0905441B1 (en)

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FR9711995 1997-09-26
FR9711995A FR2769072B1 (en) 1997-09-26 1997-09-26 MOTOR VEHICLE PROJECTOR EQUIPPED WITH A DISCHARGE LAMP AND IMPROVED ELECTROMAGNETIC SHIELDING MEANS

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GB2347995A (en) * 1999-02-23 2000-09-20 Koito Mfg Co Ltd Vehicle lamp with a discharge bulb and a reflector with shielding of electromagnetic waves
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EP1798466A1 (en) * 1999-07-02 2007-06-20 Valeo Vision Vehicle headlight equipped with a gas discharge lamp and improved means for electromagnetic shielding
EP1065438A1 (en) * 1999-07-02 2001-01-03 Valeo Vision Vehicle headlight equipped with a gas discharge lamp and improved means for electromagnetic shielding
FR2795691A1 (en) * 1999-07-02 2001-01-05 Valeo Vision MOTOR VEHICLE PROJECTOR EQUIPPED WITH A DISCHARGE LAMP AND IMPROVED ELECTROMAGNETIC SHIELDING MEANS
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WO2002037024A1 (en) * 2000-10-30 2002-05-10 Valeo Vision Motor vehicle headlight with improved electromagnetic shielding means
FR2816035A1 (en) * 2000-10-30 2002-05-03 Valeo Vision MOTOR VEHICLE PROJECTOR WITH IMPROVED ELECTROMAGNETIC SHIELDING MEANS
DE10163377A1 (en) * 2001-12-21 2003-07-17 Hella Kg Hueck & Co Headlight for use on a road vehicle has a high pressure gas discharge bulb
DE102005004637B4 (en) * 2004-03-01 2015-04-16 Volkswagen Ag Headlamp or luminaire, in particular for motor vehicles, and method for producing a diaphragm-reflector combination
FR2882130A1 (en) * 2005-02-15 2006-08-18 Renault Sas MOTOR VEHICLE PROJECTOR WITH OCCULTOR AND ELECTRICAL CONNECTION BOX
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CN103427492A (en) * 2012-05-22 2013-12-04 阿尔斯通交通设备有限公司 Power supply circuit for on board energy source or storage device and particularly for super-capacitor storage unit
CN103427492B (en) * 2012-05-22 2018-06-05 阿尔斯通运输科技公司 For the energy on delivery vehicle or storage device and it is used in particular for the power circuit of ultracapacitor storage unit
CN107429888A (en) * 2015-02-06 2017-12-01 法雷奥照明公司 Reflector arrangement for the lamp module with electromagnetic shielding
CN107429888B (en) * 2015-02-06 2020-07-07 法雷奥照明公司 Reflector arrangement for a lamp module with electromagnetic shielding

Also Published As

Publication number Publication date
FR2769072B1 (en) 1999-12-24
ES2206870T3 (en) 2004-05-16
DE69817490D1 (en) 2003-10-02
JP4190624B2 (en) 2008-12-03
JPH11162205A (en) 1999-06-18
US6176604B1 (en) 2001-01-23
DE69817490T2 (en) 2004-06-17
EP0905441B1 (en) 2003-08-27
FR2769072A1 (en) 1999-04-02

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