EP1798466A1 - Vehicle headlight equipped with a gas discharge lamp and improved means for electromagnetic shielding - Google Patents

Vehicle headlight equipped with a gas discharge lamp and improved means for electromagnetic shielding Download PDF

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Publication number
EP1798466A1
EP1798466A1 EP07007020A EP07007020A EP1798466A1 EP 1798466 A1 EP1798466 A1 EP 1798466A1 EP 07007020 A EP07007020 A EP 07007020A EP 07007020 A EP07007020 A EP 07007020A EP 1798466 A1 EP1798466 A1 EP 1798466A1
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EP
European Patent Office
Prior art keywords
housing
lamp
projector according
shielding
connector
Prior art date
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Granted
Application number
EP07007020A
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German (de)
French (fr)
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EP1798466B1 (en
Inventor
Gérard Billot
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Valeo Vision SAS
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Valeo Vision SAS
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • 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 generally relates to discharge lamp projectors.
  • such a projector comprises a reflector in which is mounted a discharge lamp, powered by a separate high-voltage power supply module, fixed for example in or on the housing of the projector.
  • a shielded cable connects the power module to the lamp, while the electromagnetic emissions at the lamp and its power supply module are sensed by specific shielding arrangements.
  • Discharge lamps have recently been developed characterized by the presence, in a fixed or removable base of the lamp, of all or part of the high-voltage supply circuit. This avoids the use of a power supply housing the converter circuits and high voltage, and therefore heavy and bulky, and therefore difficult to place in a motor vehicle headlight whose requirements in terms of compactness and lightness are without ceases growing. Thus, with this type of lamp, only a DC-DC converter circuit must be provided separately from the lamp, with a substantially reduced weight and bulk.
  • a difficulty that can be expected with this new type of lamp lies in the problems of electromagnetic compatibility in the power circuits associated with the lamp.
  • the present invention aims to overcome these problems of the prior art, and to propose a projector which as such, without weighing down, complicating or increasing the cost of comes back from its case, or other elements, and without having to design the surrounding body specifically for these issues of disturbance, or to meet the usual requirements for electromagnetic compatibility.
  • a motor vehicle headlamp comprising a gas discharge lamp associated with a supply circuit and mounted in a mirror, and shielding means with respect to disturbing electromagnetic emissions, characterized in that said supply circuit is received in a housing associated with the lamp at the rear thereof, and in that the shielding means comprise a conductive material completely surrounding said housing and adapted to provide electrical continuity between a shielding braid of a power cable arriving at said housing and shielding arrangements associated with the mirror.
  • said conductive material belongs to a housing defining said housing.
  • Said conductive material is mechanically attached to the outside of said housing.
  • Said conductive material is deposited on an outer face of said housing.
  • Said conductive material belongs to a cover attached to the rear of the mirror and surrounding a non-conductive housing defining said housing.
  • the projector includes first connection means for providing electrical continuity between said conductive material surrounding said housing and a second shielding conductive material provided at the rear surface of the mirror.
  • the first connecting means comprise a series of claws electrically connected to said second conductive material and bearing against said first conductive material. Said claws are mounted on a lamp holder attached to the mirror.
  • the first connection means comprise support arrangements for said cover against said second conductive material at the rear of the mirror.
  • the first connection means comprise a deformable seal of electrically conductive material, interposed between the first and second conductive materials.
  • the deformable seal is mounted on the mirror.
  • the deformable seal is mounted on a lamp holder attached to the mirror.
  • the projector includes second connecting means for providing electrical continuity between said conductive material surrounding said housing and said shielding braid.
  • the lamp housing has a first connector
  • the end of the power cable has a second connector capable of being plugged with the first connector
  • said second connecting means are able to eliminate the electrical continuity between said conductive material surrounding said housing and said shielding braid only after the contacts of the first and second connectors conveying the supply voltage of the lamp have separated.
  • the second connecting means comprises a series of claws carried by said second connector, said claws being in contact with the shielding braid and with the conductive material surrounding the housing.
  • Said second connecting means comprise a conductive seal in contact with the shielding braid and with the conductive material surrounding the housing.
  • Said second connecting means comprise support arrangements against the braid of the power cable, formed on said cover around an orifice for the passage of said cable.
  • the projector comprises a conductive elastic element able to bear against said conductive material at a rear face of said housing, to simultaneously ensure the retention of the lamp in the axial direction and electrical continuity of shielding with other shielding elements of the projector.
  • Said housing is an integral part of the lamp.
  • Said housing is part of a connector on which the lamp is removably mounted.
  • the projector further includes control circuitry received in an electrically conductive control box remote from the lamp, and third connecting means for providing electrical continuity between said control box and the cable braid.
  • the third connection means comprise a third connector provided on the control box and a fourth connector provided at the end of the supply cable opposite the lamp and adapted to be plugged with the third connector, and, during the separation third and fourth connectors, said third connecting means are able to suppress the electrical continuity between said control box and said shielding braid only after the contacts of the third and fourth connectors carrying the supply voltage of the lamp have separated .
  • the present invention proposes a gas discharge lamp for a motor vehicle headlamp, said lamp being associated with a supply circuit, characterized in that it incorporates in a housing said supply circuit, and in that it further comprises shielding means comprising a conductive material completely surrounding said housing and adapted to ensure electrical continuity between a shielding braid of a power cable arriving in the housing and shielding arrangements provided on a mirror adapted to receive said lamp.
  • a discharge lamp 10 which comprises an outer bulb 11 sheltering not shown and known per se an inner bulb receiving a gas mixture and two electrodes to form a luminescent arc by a gaseous discharge phenomenon.
  • a lamp body 12 having a flange 13 intended to cooperate with appropriate bearing portions of the mirror to reference the position of the lamp therein, this body being extended to the back by a housing 14 made for example in one piece with the body, all of suitable plastic material, and defining a cavity 15 for housing the electronic circuits (not shown) for feeding the lamp under the appropriate voltages .
  • This housing 14 defines in the lower part a connector 17 adapted to cooperate with a complementary connector (not shown) at the end of a shielded supply cable of the lamp 10, providing a voltage, preferably a DC voltage greater than that of the vehicle's onboard network, produced by a suitable DC / DC converter, and appropriately processed by the power supply circuits.
  • the present invention applies equally well to a lamp in which the housing is removably attached via a suitable connector to the rear of the lamp.
  • the casing 14 for the supply circuits receives a substantially continuous conducting outer casing 16 intended to pick up the parasitic electromagnetic emissions emitted by these circuits, so as to complete the shielding to which already contribute, in known manner, the mirror of the projector and a metal shield placed in the mirror in front of the lamp.
  • this envelope 16 is made in the form of a thin metal sheet attached around the casing 14.
  • this envelope is made by deposition, in particular by physical or chemical means, of at least one conductive layer 16 on the outside of the case.
  • this deposit on the inner face of the housing, providing in this case auxiliary conductive means for the continuity of the shielding with the other parts of the projector, external to this housing, can be achieved.
  • the thin envelope extends at 16a at the connector 17, so as to leave strictly accessible only what is necessary to ensure the cooperation of the connector 17 with its complementary connector.
  • FIG. 5 illustrates the principle of a second embodiment of the invention.
  • the lamp 10 made as previously, but with a housing 14 without shielding itself, a mirror 20 in which the lamp is mounted, and a metal shield 40.
  • the mirror 20 has, on its rear surface opposed to its reflective surface 21, a conductive layer 22 reported mechanically or deposited physically or chemically.
  • This conductive layer 22 and the concealer 40 are both, in known manner, connected to the ground to participate in the shielding vis-à-vis interfering electromagnetic emissions, mainly at the arc and the electrodes of the lamp .
  • FIG. 5 also shows a power supply cable 50 provided with a bare outer shielding braid 51 and terminating in a connector 52 capable of cooperating with the connector 17 provided on the lamp housing 14.
  • This cable preferably has, at its other end, a similar connector, capable of ensuring under the same conditions the continuity of the shielding with a conductive housing, to ground, housing the aforementioned DC-DC converter and more generally control circuits of the projector.
  • the housing 14 of the lamp which projects beyond the rear of the mirror, is received inside a conductive cover 30 attached to the rear of the mirror.
  • This cover has a main wall 31 facing the rear face and the lateral faces and upper and lower housing 14, while at its front end (right in Figure 5) open, it has facilities peripherals, such as bends 32 or claws, for providing electrical continuity with the conductive layer 22 of the mirror.
  • the cover 30 also has at its lower wall an opening surrounded by arrangements 33 such as claws, able to provide electrical contact with the bare shielding braid 51 of the cable 50.
  • arrangements 33 such as claws, able to provide electrical contact with the bare shielding braid 51 of the cable 50.
  • a conductive seal may be used.
  • the cover 30 which provides the electrical continuity between the ground shielding elements formed by the braid 51 and the conductive layer 22 of the mirror 20, while the shield 40 is connected to the conductive layer. 22 by conductive support tabs, not shown.
  • Figures 6 to 9 illustrate a possible embodiment for mounting the lamp as described above with reference to Figures 1 to 4 in a mirror.
  • the mirror has here, either in one piece, or attached to it, a bell-shaped member 23 extending at the rear of the mirror around the lamp hole, and open towards the rear.
  • the lamp is mounted in the mirror from the rear so that its casing 14 with an outer conductive layer 16 partially engages in the bell 23.
  • This bell carries at its periphery a plurality of claws 231 of metal having suitable elastic properties, and for example spring steel, which are suitable, when the lamp is put in place, to bear against the conductive layer 16 of the housing 14.
  • claws are further electrically connected to the conductive layer 22 located behind the mirror 20, thereby ensuring electrical continuity of the shield between the mirror and the housing 14 of the lamp.
  • the bell 23 means for retaining the lamp 10 in position, constituted by a leaf-spring 232 or other elastic member whose one end is hingedly mounted on said bell and whose opposite end can lock on the latter on the opposite side.
  • the leaf spring 232 rests on the rear face of the housing 14 to retain the lamp in its reference position defined by the support of the collar 13 on appropriate arrangements surrounding the lamp hole of the mirror. It will be noted here that the leaf spring 232 also contributes to the electrical continuity of the shield.
  • Figure 8 illustrates in particular the pivotal mounting of the leaf spring 232 at its end 2321, and the locking of said leaf spring at its opposite end 2322.
  • Fig. 8 also shows that the claws 231 extend forward (i.e., downwardly in the figure) to join a conductive part 60 belonging to the lamp holder, which is engaged in the lamp hole of the mirror. and in contact with both the conductive layer 22 of the mirror and the shield 40 (not shown) via the fastening tabs thereof (also not shown).
  • FIG. 9 illustrates the assembly of the lamp holder PL, bearing four claws 231 and provided with arrangements 61, 62 respectively for the pivotal mounting of the retaining spring blade 232 and for locking it in the locked position.
  • one or more deformable seals of electrically conductive material may be used, capable of being compressed between the conductive surfaces between which it is a question of ensuring electrical continuity.
  • Figure 10 shows schematically, in perspective, the cooperation between the connector 17 belonging to the housing 14 of the lamp and the complementary connector 52 provided at the end of the shielded power supply cable.
  • this complementary connector 52 carries a series of resilient and electrically conductive claws 521 able to bear, when the connectors are assembled, against the conductive layer 16a surrounding the connector 17. This ensures the electrical continuity of shielding between the outer braid 51 of the cable 50 and the conductive coating 16, 16a of the lamp housing 14, and consequently with the other elements, mainly mirror and shield, participating in the shielding.
  • the claws 521 can be replaced or completed by a deformable gasket of electrically conductive material compressed between the surfaces between which the electrical continuity of shielding must be ensured.
  • the connectors 17 and 52 are designed so that their disconnection first causes the disconnection of the conductor or conductors carrying the supply voltage of the lamp, and only then the disconnection of the connection ensuring continuity shielding. Conversely, when the connectors 17 and 52 are assembled, the continuity to the shielding will be established before the connector or connectors of the actual power supply.
  • FIG. 11 illustrates another embodiment for mounting a lamp according to FIGS. 1 to 4 behind the mirror 20.
  • the lamp hole is surrounded by an axial flange 24, and a conductive ring 25 is mounted, for example by screws, on the free annular surface defined by the flange 24 at its rear end.
  • This ring 25 carries at its periphery a series of double claws 251 whose anterior part is adapted to come into contact with the conductive layer 22 formed at the rear of the mirror 20 (this conductive layer extending at 22a at the outer face of the flange 24), and a rear portion of which is capable of coming into contact with the conductive coating 16 formed on the casing 14 of the lamp 10.
  • a conductive seal can again be used here.
  • the ring 25 carries a leaf spring 252 retaining the lamp, similar to the leaf spring 232 described above.
  • Figure 12 illustrates an improvement to the retaining spring blade 242, here mounted directly on a flange 24 made in one piece with the mirror 20 or reported on it.
  • the leaf spring 242 carries an appendix 2421 intended to cap, with electrical conduction, the outer braid bare of the power cable 50. This allows in particular to achieve electrical continuity between said braid and the shield 22 of the mirror 20, whose electrical continuity with the leaf spring 242 is achieved by any suitable means.
  • FIG. 13 illustrates a particular embodiment of the mounting of the shielding cover 30 of FIG. 5 around the rear part of the lamp.
  • the cover 30 has a first appendage 34 by which it is pivotally mounted on an axis integral with the mirror, and a second appendage through which, the cover being in place by covering the lamp, it is held in position by means of a screw or the like.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Abstract

The motor vehicle headlight has casing (14) with power supply circuit enclosed by conducting outer envelope and arranged to the backside of a discharge lamp (10). The conducting envelope provides electrical continuity between screening braid of a power supply cable (50) and screening of a mirror (20). An independent claim is also included for gas discharge lamp.

Description

La présente invention concerne d'une façon générale les projecteurs à lampe à décharge.The present invention generally relates to discharge lamp projectors.

De façon classique, un tel projecteur comprend un réflecteur dans lequel est montée une lampe à décharge, alimentée par un module séparé d'alimentation à haute tension, fixé par exemple dans ou sur le boîtier du projecteur. Un câble blindé relie le module d'alimentation à la lampe, tandis que les émissions électromagnétiques au niveau de la lampe et de son module d'alimentation sont captées par des aménagements de blindage spécifiques.Conventionally, such a projector comprises a reflector in which is mounted a discharge lamp, powered by a separate high-voltage power supply module, fixed for example in or on the housing of the projector. A shielded cable connects the power module to the lamp, while the electromagnetic emissions at the lamp and its power supply module are sensed by specific shielding arrangements.

On a récemment développé des lampes à décharge caractérisées par la présence, dans une embase fixe ou amovible de la lampe, de tout ou partie du circuit d'alimentation à haute tension. On évite ainsi le recours à un boîtier d'alimentation abritant les circuits convertisseurs et de haute tension, et par conséquent lourd et encombrant, et donc difficile à placer dans un projecteur de véhicule automobile dont les exigences en termes de compacité et de légèreté sont sans cesse croissantes. Ainsi, avec ce type de lampe, seul un circuit convertisseur continu-continu doit être prévu séparément de la lampe, avec un poids et un encombrement sensiblement réduits.Discharge lamps have recently been developed characterized by the presence, in a fixed or removable base of the lamp, of all or part of the high-voltage supply circuit. This avoids the use of a power supply housing the converter circuits and high voltage, and therefore heavy and bulky, and therefore difficult to place in a motor vehicle headlight whose requirements in terms of compactness and lightness are without ceases growing. Thus, with this type of lamp, only a DC-DC converter circuit must be provided separately from the lamp, with a substantially reduced weight and bulk.

Une difficulté à laquelle on peut toutefois s'attendre avec ce nouveau type de lampe réside dans les problèmes de compatibilité électromagnétique au niveau des circuits d'alimentation associés à la lampe.A difficulty that can be expected with this new type of lamp lies in the problems of electromagnetic compatibility in the power circuits associated with the lamp.

Ainsi, pour parfaire la compatibilité électromagnétique tout autour du projecteur, il peut s'avérer nécessaire de concevoir la carrosserie avoisinante du véhicule de manière à ce qu'elle participe au blindage vis à vis des émissions électromagnétiques parasites.Thus, to complete the electromagnetic compatibility around the projector, it may be necessary to design the neighboring body of the vehicle so that it participates in shielding against parasitic electromagnetic emissions.

On comprend que ceci va constituer pour les constructeurs une contrainte indésirable, sachant que ceux-ci peuvent souhaiter conserver toute liberté dans la conception de la carrosserie à l'avant du véhicule. Une telle approche est en outre inapplicable dans le cas de carrosseries en matériau composite, ou plus généralement non conducteur.It will be understood that this will constitute for the manufacturers an undesirable constraint, knowing that they may wish to retain all freedom in the design of the bodywork at the front of the vehicle. Such an approach is also inapplicable in the case of bodies made of composite material, or more generally non-conductive.

La présente invention vise à pallier ces problèmes de l'art antérieur, et à proposer un projecteur qui en tant que tel, sans alourdir, compliquer ou accroître le coût de revient ni de son boîtier, ni d'autres éléments, et sans avoir à concevoir la carrosserie avoisinante de façon spécifique au regard de ces questions de perturbations, soit à même de satisfaire aux exigences habituelles en matière de compatibilité électromagnétique.The present invention aims to overcome these problems of the prior art, and to propose a projector which as such, without weighing down, complicating or increasing the cost of comes back from its case, or other elements, and without having to design the surrounding body specifically for these issues of disturbance, or to meet the usual requirements for electromagnetic compatibility.

Elle propose à cet effet, selon un premier aspect, un projecteur de véhicule automobile, comprenant une lampe à décharge gazeuse associée à un circuit d'alimentation et montée dans un miroir, et des moyens de blindage vis à vis d'émissions électromagnétiques perturbatrices, caractérisé en ce que ledit circuit d'alimentation est reçu dans un logement associé à la lampe à l'arrière de celle-ci, et en ce que les moyens de blindage comprennent un matériau conducteur entourant entièrement ledit logement et apte à assurer la continuité électrique entre une tresse de blindage d'un câble d'alimentation arrivant audit logement et des aménagements de blindage associés au miroir.It proposes for this purpose, according to a first aspect, a motor vehicle headlamp, comprising a gas discharge lamp associated with a supply circuit and mounted in a mirror, and shielding means with respect to disturbing electromagnetic emissions, characterized in that said supply circuit is received in a housing associated with the lamp at the rear thereof, and in that the shielding means comprise a conductive material completely surrounding said housing and adapted to provide electrical continuity between a shielding braid of a power cable arriving at said housing and shielding arrangements associated with the mirror.

Des aspects préférés, mais non limitatifs, du projecteur selon l'invention sont les suivants : ledit matériau conducteur appartient à un boîtier définissant ledit logement. Ledit matériau conducteur est mécaniquement rapporté à l'extérieur dudit boîtier. Ledit matériau conducteur est déposé sur une face extérieure dudit boîtier. Ledit matériau conducteur appartient à un couvercle rapporté sur l'arrière du miroir et entourant un boîtier non conducteur définissant ledit logement. Le projecteur comprend des premiers moyens de liaison pour assurer la continuité électrique entre ledit matériau conducteur entourant ledit logement et un second matériau conducteur de blindage prévu à la surface arrière du miroir. Les premiers moyens de liaison comprennent une série de griffes reliées électriquement audit second matériau conducteur et en appui contre ledit premier matériau conducteur. Lesdites griffes sont montées sur un porte-lampe rapporté sur le miroir. Les premiers moyens de liaison comprennent des aménagements d'appui dudit couvercle contre ledit second matériau conducteur à l'arrière du miroir. Les premiers moyens de liaison comprennent un joint déformable en matériau électriquement conducteur, interposé entre les premier et second matériaux conducteurs. Le joint déformable est monté sur le miroir. Le joint déformable est monté sur un porte-lampe rapporté sur le miroir. Le projecteur comprend des deuxièmes moyens de liaison pour assurer la continuité électrique entre ledit matériau conducteur entourant ledit logement et ladite tresse de blindage. Le boîtier de la lampe possède un premier connecteur, l'extrémité du câble d'alimentation possède un second connecteur apte à s'enficher avec le premier connecteur, et, lors de la séparation des premier et second connecteurs, lesdits deuxièmes moyens de liaison sont aptes à supprimer la continuité électrique entre ledit matériau conducteur entourant ledit logement et ladite tresse de blindage seulement après que les contacts des premier et second connecteurs véhiculant la tension d'alimentation de la lampe se sont séparés. Les deuxièmes moyens de liaison comprennent une série de griffes portées par ledit second connecteur, lesdites griffes étant en contact avec la tresse de blindage et avec le matériau conducteur entourant le boîtier. Lesdits deuxièmes moyens de liaison comprennent un joint conducteur en contact avec la tresse de blindage et avec le matériau conducteur entourant le boîtier. Il est prévu un moyen élastique de retenue de la lampe en position axiale, ledit moyen s'appuyant contre le matériau conducteur de blindage, et ledit moyen élastique, qui est conducteur et qui, en position de retenue, est en contact avec ladite tresse de blindage du câble, fait partie desdits deuxièmes moyens de liaison. Lesdits deuxièmes moyens de liaison comprennent des aménagements d'appui contre la tresse du câble d'alimentation, formés sur ledit couvercle autour d'un orifice pour le passage dudit câble. Le projecteur comprend un élément élastique conducteur apte à s'appuyer contre ledit matériau conducteur au niveau d'une face arrière dudit boîtier, pour assurer simultanément la retenue de la lampe en direction axiale et une continuité électrique de blindage avec d'autres éléments de blindage du projecteur. Ledit logement fait partie intégrante de la lampe. Ledit logement fait partie d'un connecteur sur lequel la lampe est montée de façon amovible. Le projecteur comprend en outre des circuits de commande reçus dans un boîtier de commande électriquement conducteur situé à distance de la lampe, et des troisièmes moyens de liaison pour assurer la continuité électrique entre ledit boîtier de commande et la tresse du câble. Les troisièmes moyens de liaison comprennent un troisième connecteur prévu sur le boîtier de commande et un quatrième connecteur prévu à l'extrémité du câble d'alimentation opposée à la lampe et apte à s'enficher avec le troisième connecteur, et, lors de la séparation des troisième et quatrième connecteurs, lesdits troisièmes moyens de liaison sont aptes à supprimer la continuité électrique entre ledit boîtier de commande et ladite tresse de blindage seulement après que les contacts des troisième et quatrième connecteurs véhiculant la tension d'alimentation de la lampe se sont séparés.Preferred, but not limiting, aspects of the projector according to the invention are as follows: said conductive material belongs to a housing defining said housing. Said conductive material is mechanically attached to the outside of said housing. Said conductive material is deposited on an outer face of said housing. Said conductive material belongs to a cover attached to the rear of the mirror and surrounding a non-conductive housing defining said housing. The projector includes first connection means for providing electrical continuity between said conductive material surrounding said housing and a second shielding conductive material provided at the rear surface of the mirror. The first connecting means comprise a series of claws electrically connected to said second conductive material and bearing against said first conductive material. Said claws are mounted on a lamp holder attached to the mirror. The first connection means comprise support arrangements for said cover against said second conductive material at the rear of the mirror. The first connection means comprise a deformable seal of electrically conductive material, interposed between the first and second conductive materials. The deformable seal is mounted on the mirror. The deformable seal is mounted on a lamp holder attached to the mirror. The projector includes second connecting means for providing electrical continuity between said conductive material surrounding said housing and said shielding braid. The lamp housing has a first connector, the end of the power cable has a second connector capable of being plugged with the first connector, and, during the separation of the first and second connectors, said second connecting means are able to eliminate the electrical continuity between said conductive material surrounding said housing and said shielding braid only after the contacts of the first and second connectors conveying the supply voltage of the lamp have separated. The second connecting means comprises a series of claws carried by said second connector, said claws being in contact with the shielding braid and with the conductive material surrounding the housing. Said second connecting means comprise a conductive seal in contact with the shielding braid and with the conductive material surrounding the housing. There is provided an elastic means for retaining the lamp in axial position, said means resting against the conductive shielding material, and said elastic means, which is conductive and which, in the retaining position, is in contact with said braid of shielding the cable, is part of said second connecting means. Said second connecting means comprise support arrangements against the braid of the power cable, formed on said cover around an orifice for the passage of said cable. The projector comprises a conductive elastic element able to bear against said conductive material at a rear face of said housing, to simultaneously ensure the retention of the lamp in the axial direction and electrical continuity of shielding with other shielding elements of the projector. Said housing is an integral part of the lamp. Said housing is part of a connector on which the lamp is removably mounted. The projector further includes control circuitry received in an electrically conductive control box remote from the lamp, and third connecting means for providing electrical continuity between said control box and the cable braid. The third connection means comprise a third connector provided on the control box and a fourth connector provided at the end of the supply cable opposite the lamp and adapted to be plugged with the third connector, and, during the separation third and fourth connectors, said third connecting means are able to suppress the electrical continuity between said control box and said shielding braid only after the contacts of the third and fourth connectors carrying the supply voltage of the lamp have separated .

Selon un deuxième aspect, la présente invention propose une lampe à décharge gazeuse pour projecteur de véhicule automobile, ladite lampe étant associée à un circuit d'alimentation, caractérisée en ce qu'elle incorpore dans un logement ledit circuit d'alimentation, et en ce qu'elle comprend en outre des moyens de blindage comprenant un matériau conducteur entourant entièrement ledit logement et apte à assurer la continuité électrique entre une tresse de blindage d'un câble d'alimentation arrivant dans le logement et des aménagements de blindage prévus sur un miroir apte à recevoir ladite lampe.According to a second aspect, the present invention proposes a gas discharge lamp for a motor vehicle headlamp, said lamp being associated with a supply circuit, characterized in that it incorporates in a housing said supply circuit, and in that it further comprises shielding means comprising a conductive material completely surrounding said housing and adapted to ensure electrical continuity between a shielding braid of a power cable arriving in the housing and shielding arrangements provided on a mirror adapted to receive said lamp.

D'autres aspects, buts et avantages de la présente invention apparaîtront mieux à la lecture de la description détaillée suivante de différentes formes de réalisation 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 de côté d'une lampe à décharge selon une première forme de réalisation de l'invention,
  • la figure 2 est une vue de dos de la lampe de la figure 1,
  • la figure 3 est une vue de côté et partiellement en coupe de la lampe des figures 1 et 2,
  • la figure 4 est une vue de dos et partiellement en coupe de la lampe des figures 1 à 3,
  • la figure 5 est une vue de côté et partiellement en coupe d'un ensemble lampe/miroir selon une deuxième forme de réalisation de l'invention,
  • la figure 6 est une vue de côté et partiellement en coupe du montage d'une lampe selon la première forme de réalisation de l'invention dans un miroir de projecteur,
  • la figure 7 est une vue de dos partielle illustrant un détail du montage de la figure 6,
  • la figure 8 est une vue en coupe partielle illustrant plus en détail le montage de la figure 7,
  • la figure 9 est une vue de dos d'un porte-lampe utilisé dans le montage de la figure 8,
  • la figure 10 illustre un moyen de continuité de blindage entre lampe et câble utilisé avec une lampe selon l'invention,
  • la figure 11 est une vue de côté et partiellement en coupe d'une variante de l'ensemble lampe/miroir de la figure 5,
  • la figure 12 est une vue de côté et partiellement en coupe illustrant un moyen de continuité de blindage entre lampe et câble utilisé avec une lampe selon l'invention, et
  • la figure 13 est une vue de dos schématique d'un capot arrière de miroir pouvant être utilisé dans la deuxième forme de réalisation de l'invention.
Other aspects, objects and advantages of the present invention will appear better on reading the following detailed description of various embodiments thereof, given by way of nonlimiting example and with reference to the appended drawings, in which: :
  • FIG. 1 is a side view of a discharge lamp according to a first embodiment of the invention,
  • FIG. 2 is a rear view of the lamp of FIG. 1,
  • FIG. 3 is a side view and partially in section of the lamp of FIGS. 1 and 2,
  • FIG. 4 is a view from the back and partially in section of the lamp of FIGS. 1 to 3,
  • FIG. 5 is a side view and partially in section of a lamp / mirror assembly according to a second embodiment of the invention,
  • FIG. 6 is a side view and partially in section of the mounting of a lamp according to the first embodiment of the invention in a projector mirror,
  • FIG. 7 is a partial rear view illustrating a detail of the assembly of FIG. 6,
  • FIG. 8 is a partial sectional view illustrating in more detail the assembly of FIG. 7,
  • FIG. 9 is a rear view of a lamp holder used in the assembly of FIG. 8,
  • FIG. 10 illustrates a means of continuity of shielding between lamp and cable used with a lamp according to the invention,
  • FIG. 11 is a side view and partially in section of a variant of the lamp / mirror assembly of FIG. 5,
  • Figure 12 is a side view and partially in section illustrating a means of continuity of shielding between lamp and cable used with a lamp according to the invention, and
  • Figure 13 is a schematic back view of a rear mirror cover that can be used in the second embodiment of the invention.

En référence tout d'abord aux figures 1 à 4, on a représenté une lampe à décharge 10 qui comprend un bulbe extérieur 11 abritant de façon non illustrée et connue en soi un bulbe intérieur recevant un mélange gazeux et deux électrodes pour former un arc luminescent par un phénomène de décharge gazeuse.Referring firstly to Figures 1 to 4, there is shown a discharge lamp 10 which comprises an outer bulb 11 sheltering not shown and known per se an inner bulb receiving a gas mixture and two electrodes to form a luminescent arc by a gaseous discharge phenomenon.

A l'arrière du bulbe 11 s'étend un corps de lampe 12 possédant une collerette 13 destinée à coopérer avec des parties d'appui appropriées du miroir pour référencer la position de la lampe dans celui-ci, ce corps étant prolongé à l'arrière par un boîtier 14 réalisé par exemple d'un seul tenant avec le corps, le tout en matière plastique appropriée, et définissant une cavité 15 destinée à abriter les circuits électroniques (non représentés) permettant l'alimentation de la lampe sous les tensions appropriées. Ce boîtier 14 définit en partie inférieure un connecteur 17 apte à coopérer avec un connecteur complémentaire (non illustré) à l'extrémité d'un câble blindé d'alimentation de la lampe 10, fournissant une tension, de préférence une tension continue supérieure à celle du réseau de bord du véhicule, produite par un convertisseur continu/continu approprié, et traitée de façon appropriée par les circuits d'alimentation.At the rear of the bulb 11 extends a lamp body 12 having a flange 13 intended to cooperate with appropriate bearing portions of the mirror to reference the position of the lamp therein, this body being extended to the back by a housing 14 made for example in one piece with the body, all of suitable plastic material, and defining a cavity 15 for housing the electronic circuits (not shown) for feeding the lamp under the appropriate voltages . This housing 14 defines in the lower part a connector 17 adapted to cooperate with a complementary connector (not shown) at the end of a shielded supply cable of the lamp 10, providing a voltage, preferably a DC voltage greater than that of the vehicle's onboard network, produced by a suitable DC / DC converter, and appropriately processed by the power supply circuits.

On observera ici que la présente invention s'applique aussi bien à une lampe dans laquelle le boîtier est rapporté de façon amovible, par l'intermédiaire d'un connecteur approprié, à l'arrière de la lampe.It will be observed here that the present invention applies equally well to a lamp in which the housing is removably attached via a suitable connector to the rear of the lamp.

Selon une première forme de réalisation de l'invention, et comme illustré sur les figures 3 et 4, le boîtier 14 pour les circuits d'alimentation reçoit une enveloppe extérieure conductrice essentiellement continue 16 destinée à capter les émissions électromagnétiques parasite émises par ces circuits, de manière à parfaire le blindage auquel contribuent déjà, de façon connue en soi, le miroir du projecteur et un occulteur métallique placé dans le miroir en avant de la lampe.According to a first embodiment of the invention, and as illustrated in FIGS. 3 and 4, the casing 14 for the supply circuits receives a substantially continuous conducting outer casing 16 intended to pick up the parasitic electromagnetic emissions emitted by these circuits, so as to complete the shielding to which already contribute, in known manner, the mirror of the projector and a metal shield placed in the mirror in front of the lamp.

Selon un premier mode d'exécution, cette enveloppe 16 est réalisée sous forme d'une tôle métallique mince rapportée autour du boîtier 14.According to a first embodiment, this envelope 16 is made in the form of a thin metal sheet attached around the casing 14.

Selon un deuxième mode d'exécution, cette enveloppe est réalisée par dépôt, notamment par voie physique ou chimique, d'au moins une couche conductrice 16 sur la face externe du boîtier. Selon une variante, on peut prévoir de réaliser ce dépôt sur la face interne du boîtier, en prévoyant dans ce cas des moyens conducteurs auxiliaires pour que la continuité du blindage avec les autres parties du projecteur, externes à ce boîtier, puisse être réalisée.According to a second embodiment, this envelope is made by deposition, in particular by physical or chemical means, of at least one conductive layer 16 on the outside of the case. According to a variant, it is possible to provide this deposit on the inner face of the housing, providing in this case auxiliary conductive means for the continuity of the shielding with the other parts of the projector, external to this housing, can be achieved.

On observe que l'enveloppe mince se prolonge en 16a au niveau du connecteur 17, de manière à ne laisser accessible strictement que ce qui est nécessaire pour assurer la coopération du connecteur 17 avec son connecteur complémentaire.It is observed that the thin envelope extends at 16a at the connector 17, so as to leave strictly accessible only what is necessary to ensure the cooperation of the connector 17 with its complementary connector.

La figure 5 illustre le principe d'une deuxième forme de réalisation de l'invention. Sur cette figure, on a illustré la lampe 10 réalisée comme précédemment, mais avec un boîtier 14 dépourvu en soi de blindage, un miroir 20 dans lequel la lampe est montée, et un occulteur métallique 40. Le miroir 20 possède, sur sa face postérieure opposée à sa surface réfléchissante 21, une couche conductrice 22 rapportée mécaniquement ou déposée par voie physique ou chimique. Cette couche conductrice 22 et l'occulteur 40 sont tous deux, de façon connue en soi, raccordés à la masse pour participer au blindage vis-à-vis des émissions électromagnétiques perturbatrices, principalement au niveau de l'arc et des électrodes de la lampe.Figure 5 illustrates the principle of a second embodiment of the invention. In this figure, there is illustrated the lamp 10 made as previously, but with a housing 14 without shielding itself, a mirror 20 in which the lamp is mounted, and a metal shield 40. The mirror 20 has, on its rear surface opposed to its reflective surface 21, a conductive layer 22 reported mechanically or deposited physically or chemically. This conductive layer 22 and the concealer 40 are both, in known manner, connected to the ground to participate in the shielding vis-à-vis interfering electromagnetic emissions, mainly at the arc and the electrodes of the lamp .

On a également représenté sur la figure 5 un câble d'alimentation 50, pourvu d'une tresse de blindage extérieure nue 51 et se terminant par un connecteur 52 apte à coopérer avec le connecteur 17 prévu sur le boîtier 14 de la lampe. Ce câble possède de préférence, à son autre extrémité, un connecteur similaire, capable d'assurer dans les mêmes conditions la continuité du blindage avec un boîtier conducteur, à la masse, abritant le convertisseur continu-continu précité et plus généralement des circuits de commande du projecteur.FIG. 5 also shows a power supply cable 50 provided with a bare outer shielding braid 51 and terminating in a connector 52 capable of cooperating with the connector 17 provided on the lamp housing 14. This cable preferably has, at its other end, a similar connector, capable of ensuring under the same conditions the continuity of the shielding with a conductive housing, to ground, housing the aforementioned DC-DC converter and more generally control circuits of the projector.

Selon la deuxième forme de réalisation de l'invention, le boîtier 14 de la lampe, qui déborde à l'arrière du miroir, est reçu à l'intérieur d'un couvercle conducteur 30 rapporté sur l'arrière du miroir.According to the second embodiment of the invention, the housing 14 of the lamp, which projects beyond the rear of the mirror, is received inside a conductive cover 30 attached to the rear of the mirror.

Ce couvercle possède une paroi principale 31 située en vis-à-vis la face arrière et les faces latérales et supérieure et inférieure du boîtier 14, tandis qu'à son extrémité avant (à droite sur la figure 5) ouverte, il présente des aménagements périphériques, tels que des coudes 32 ou des griffes, destinés à assurer une continuité électrique avec la couche conductrice 22 du miroir.This cover has a main wall 31 facing the rear face and the lateral faces and upper and lower housing 14, while at its front end (right in Figure 5) open, it has facilities peripherals, such as bends 32 or claws, for providing electrical continuity with the conductive layer 22 of the mirror.

En variante ou additionnellement, on peut interposer entre l'extrémité avant du couvercle 30 et la face arrière du miroir possédant la couche conductrice 22 un joint déformable en matériau électriquement conducteur, qui peut être monté soir sur le couvercle, soit sur le miroir.Alternatively or additionally, it is possible to interpose between the front end of the cover 30 and the rear face of the mirror having the conductive layer 22 a seal deformable electrically conductive material, which can be mounted at night on the lid, or on the mirror.

Le couvercle 30 possède également au niveau de sa paroi inférieure une ouverture entourée par des aménagements 33 tels que des griffes, aptes à assurer un contact électrique avec la tresse de blindage nue 51 du câble 50. Ici encore, un joint conducteur peut être utilisé.The cover 30 also has at its lower wall an opening surrounded by arrangements 33 such as claws, able to provide electrical contact with the bare shielding braid 51 of the cable 50. Here again, a conductive seal may be used.

On observe ici que c'est le couvercle 30 qui assure la continuité électrique entre les éléments de blindage à la masse constitués par la tresse 51 et par la couche conductrice 22 du miroir 20, tandis que l'occulteur 40 est relié à la couche conductrice 22 par des pattes de support conductrices, non représentées.It is observed here that it is the cover 30 which provides the electrical continuity between the ground shielding elements formed by the braid 51 and the conductive layer 22 of the mirror 20, while the shield 40 is connected to the conductive layer. 22 by conductive support tabs, not shown.

Les figures 6 à 9 illustrent un mode de réalisation possible pour le montage de la lampe telle que décrite plus haut en référence aux figures 1 à 4 dans un miroir.Figures 6 to 9 illustrate a possible embodiment for mounting the lamp as described above with reference to Figures 1 to 4 in a mirror.

Le miroir possède ici, soit d'un seul tenant, soit rapporté sur celui-ci, un élément 23 en forme de cloche s'étendant à l'arrière du miroir autour du trou de lampe, et ouvert vers l'arrière.The mirror has here, either in one piece, or attached to it, a bell-shaped member 23 extending at the rear of the mirror around the lamp hole, and open towards the rear.

La lampe est montée dans le miroir par l'arrière de telle sorte que son boîtier 14 à couche conductrice extérieure 16 vienne partiellement s'engager dans la cloche 23.The lamp is mounted in the mirror from the rear so that its casing 14 with an outer conductive layer 16 partially engages in the bell 23.

Cette cloche porte à sa périphérie une pluralité de griffes 231 en métal ayant des propriétés d'élasticité appropriées, et par exemple en acier à ressort, qui sont aptes, lorsque la lampe est mise en place, à venir en appui contre la couche conductrice 16 du boîtier 14.This bell carries at its periphery a plurality of claws 231 of metal having suitable elastic properties, and for example spring steel, which are suitable, when the lamp is put in place, to bear against the conductive layer 16 of the housing 14.

Ces griffes sont en outre reliées électriquement à la couche conductrice 22 située en arrière du miroir 20, pour ainsi assurer la continuité électrique du blindage entre le miroir et le boîtier 14 de la lampe.These claws are further electrically connected to the conductive layer 22 located behind the mirror 20, thereby ensuring electrical continuity of the shield between the mirror and the housing 14 of the lamp.

En outre, on prévoit avantageusement sur la cloche 23 des moyens de retenue de la lampe 10 en position, constitués par une lame-ressort 232 ou autre organe élastique dont une extrémité est montée de façon articulée sur ladite cloche et dont l'extrémité opposée peut se verrouiller sur cette dernière du côté opposé. Dans cette position, la lame-ressort 232 s'appuie sur la face arrière du boîtier 14 pour retenir la lampe dans sa position de référence définie par l'appui de la collerette 13 sur des aménagements appropriés entourant le trou de lampe du miroir. On notera ici que la lame ressort 232 contribue également à la continuité électrique du blindage.In addition, it is advantageously provided on the bell 23 means for retaining the lamp 10 in position, constituted by a leaf-spring 232 or other elastic member whose one end is hingedly mounted on said bell and whose opposite end can lock on the latter on the opposite side. In this position, the leaf spring 232 rests on the rear face of the housing 14 to retain the lamp in its reference position defined by the support of the collar 13 on appropriate arrangements surrounding the lamp hole of the mirror. It will be noted here that the leaf spring 232 also contributes to the electrical continuity of the shield.

La figure 8 illustre en particulier le montage pivotant de la lame-ressort 232 à son extrémité 2321, et le verrouillage de ladite lame-ressort à son extrémité opposée 2322.Figure 8 illustrates in particular the pivotal mounting of the leaf spring 232 at its end 2321, and the locking of said leaf spring at its opposite end 2322.

Par ailleurs, la figure 8 montre également que les griffes 231 se prolongent vers l'avant (à savoir vers le bas sur la figure) pour rejoindre une pièce conductrice 60 appartenant au porte-lampe, qui est engagée dans le trou de lampe du miroir et en contact à la fois avec la couche conductrice 22 du miroir et avec l'occulteur 40 (non représenté) par l'intermédiaire des pattes de fixation de celui-ci (également non représentées).On the other hand, Fig. 8 also shows that the claws 231 extend forward (i.e., downwardly in the figure) to join a conductive part 60 belonging to the lamp holder, which is engaged in the lamp hole of the mirror. and in contact with both the conductive layer 22 of the mirror and the shield 40 (not shown) via the fastening tabs thereof (also not shown).

La figure 9 illustre quant à elle l'ensemble du porte-lampe PL, portant quatre griffes 231 et pourvu d'aménagements 61, 62 respectivement pour le montage pivotant de la lame-ressort de retenue 232 et pour son accrochage en position verrouillée.FIG. 9 illustrates the assembly of the lamp holder PL, bearing four claws 231 and provided with arrangements 61, 62 respectively for the pivotal mounting of the retaining spring blade 232 and for locking it in the locked position.

En variante des différentes formes de griffes décrites ci-dessus, ou en sus de celles-ci, on peut utiliser un ou plusieurs joints déformables en matériau électriquement conducteur, aptes à être comprimés entre les surfaces conductrices entre lesquelles il s'agit d'assurer la continuité électrique.As a variant of the different claw shapes described above, or in addition to these, one or more deformable seals of electrically conductive material may be used, capable of being compressed between the conductive surfaces between which it is a question of ensuring electrical continuity.

La figure 10 représente schématiquement, en perspective, la coopération entre le connecteur 17 appartenant au boîtier 14 de la lampe et le connecteur complémentaire 52 prévu à l'extrémité du câble blindé d'alimentation.Figure 10 shows schematically, in perspective, the cooperation between the connector 17 belonging to the housing 14 of the lamp and the complementary connector 52 provided at the end of the shielded power supply cable.

Ainsi le corps de ce connecteur complémentaire 52 porte une série de griffes élastiques et électriquement conductrices 521 aptes à venir s'appuyer, lorsque les connecteurs sont assemblés, contre la couche conductrice 16a entourant le connecteur 17. On assure ainsi la continuité électrique de blindage entre la tresse extérieure 51 du câble 50 et le revêtement conducteur 16, 16a du boîtier de lampe 14, et par voie de conséquence avec les autres éléments, principalement miroir et occulteur, participant au blindage.Thus the body of this complementary connector 52 carries a series of resilient and electrically conductive claws 521 able to bear, when the connectors are assembled, against the conductive layer 16a surrounding the connector 17. This ensures the electrical continuity of shielding between the outer braid 51 of the cable 50 and the conductive coating 16, 16a of the lamp housing 14, and consequently with the other elements, mainly mirror and shield, participating in the shielding.

Ici encore, on peut remplacer ou compléter les griffes 521 par un joint déformable en matériau électriquement conducteur comprimé entre les surfaces entre lesquelles la continuité électrique de blindage doit être assurée.Here again, the claws 521 can be replaced or completed by a deformable gasket of electrically conductive material compressed between the surfaces between which the electrical continuity of shielding must be ensured.

On notera ici qu'avantageusement, les connecteurs 17 et 52 sont conçus pour que leur déconnexion provoque tout d'abord la déconnexion du ou des conducteurs acheminant la tension d'alimentation de la lampe, et seulement ensuite la déconnexion de la liaison assurant la continuité du blindage. Inversement, lorsque les connecteurs 17 et 52 sont assemblés, la continuité au blindage sera établie avant que le ou les connecteurs de l'alimentation proprement dite.It will be noted here that advantageously, the connectors 17 and 52 are designed so that their disconnection first causes the disconnection of the conductor or conductors carrying the supply voltage of the lamp, and only then the disconnection of the connection ensuring continuity shielding. Conversely, when the connectors 17 and 52 are assembled, the continuity to the shielding will be established before the connector or connectors of the actual power supply.

De la même manière, il est avantageux que les connecteurs opérant entre l'extrémité opposée du câble 50 et le boîtier de commande appartenant au projecteur et situé à distance de la lampe présentent le même comportement.In the same way, it is advantageous that the connectors operating between the opposite end of the cable 50 and the control unit belonging to the projector and located at a distance from the lamp have the same behavior.

La figure 11 illustre quant à elle un autre mode d'exécution pour le montage d'une lampe selon les figures 1 à 4 à l'arrière du miroir 20.FIG. 11 illustrates another embodiment for mounting a lamp according to FIGS. 1 to 4 behind the mirror 20.

Le trou de lampe est entouré par une collerette axiale 24, et une couronne conductrice 25 est montée, par exemple par des vis, sur la surface annulaire libre définie par la collerette 24 à son extrémité postérieure.The lamp hole is surrounded by an axial flange 24, and a conductive ring 25 is mounted, for example by screws, on the free annular surface defined by the flange 24 at its rear end.

Cette couronne 25 porte à sa périphérie une série de doubles griffes 251 dont une partie antérieure est apte à venir en contact avec la couche conductrice 22 formée à l'arrière du miroir 20 (cette couche conductrice se prolongeant en 22a au niveau de la face externe de la collerette 24), et dont une partie postérieure est apte à venir en contact avec le revêtement conducteur 16 formé sur le boîtier 14 de la lampe 10. Un joint conducteur peut ici encore être utilisé.This ring 25 carries at its periphery a series of double claws 251 whose anterior part is adapted to come into contact with the conductive layer 22 formed at the rear of the mirror 20 (this conductive layer extending at 22a at the outer face of the flange 24), and a rear portion of which is capable of coming into contact with the conductive coating 16 formed on the casing 14 of the lamp 10. A conductive seal can again be used here.

En outre, la couronne 25 porte une lame-ressort 252 de retenue de la lampe, analogue à la lame-ressort 232 décrite plus haut.In addition, the ring 25 carries a leaf spring 252 retaining the lamp, similar to the leaf spring 232 described above.

Ici encore, on assure la continuité électrique entre le blindage 16 du boîtier 14 de la lampe et le blindage 22 du miroir.Again, electrical continuity is provided between the shield 16 of the lamp housing 14 and the shield 22 of the mirror.

La figure 12 illustre quant à elle un perfectionnement à la lame-ressort de retenue 242, ici montée directement sur une collerette 24 réalisée d'un seul tenant avec le miroir 20 ou encore rapportée sur celui-ci. Selon ce perfectionnement, la lame-ressort 242 porte un appendice 2421 destiné à venir coiffer, avec conduction électrique, la tresse extérieure nue du câble d'alimentation 50. Ceci permet notamment de réaliser la continuité électrique entre ladite tresse et le blindage 22 du miroir 20, dont la continuité électrique avec la lame-ressort 242 est réalisée par tout moyen approprié.Figure 12 illustrates an improvement to the retaining spring blade 242, here mounted directly on a flange 24 made in one piece with the mirror 20 or reported on it. According to this improvement, the leaf spring 242 carries an appendix 2421 intended to cap, with electrical conduction, the outer braid bare of the power cable 50. This allows in particular to achieve electrical continuity between said braid and the shield 22 of the mirror 20, whose electrical continuity with the leaf spring 242 is achieved by any suitable means.

Enfin la figure 13 illustre une forme de réalisation particulière du montage du couvercle de blindage 30 de la figure 5 autour de la partie postérieure de la lampe. Le couvercle 30 possède un premier appendice 34 par lequel il est monté pivotant sur un axe solidaire du miroir, et un second appendice par lequel, le couvercle étant en place en recouvrant la lampe, il est retenu en position à l'aide d'une vis ou analogue.Finally, FIG. 13 illustrates a particular embodiment of the mounting of the shielding cover 30 of FIG. 5 around the rear part of the lamp. The cover 30 has a first appendage 34 by which it is pivotally mounted on an axis integral with the mirror, and a second appendage through which, the cover being in place by covering the lamp, it is held in position by means of a screw or the like.

Bien entendu, la présente invention n'est nullement limitée aux formes de réalisation décrites et représentées, mais l'homme du métier saura y apporter de nombreuses variantes et modifications.Of course, the present invention is not limited to the embodiments described and shown, but the skilled person will be able to make many variations and modifications.

Claims (31)

Projecteur de véhicule automobile, comprenant une lampe à décharge gazeuse (10) associée à un circuit d'alimentation et montée dans un miroir (20), et des moyens de blindage (16, 30; 22, 40, 51) vis à vis d'émissions électromagnétiques perturbatrices, caractérisé en ce que ledit circuit d'alimentation est reçu dans un logement (15) associé à la lampe à l'arrière de celle-ci, et en ce que les moyens de blindage comprennent un matériau conducteur (16 ; 30) entourant entièrement ledit logement et apte à assurer la continuité électrique entre une tresse de blindage d'un câble d'alimentation arrivant audit logement et des aménagements de blindage associés au miroir, et en ce que ledit matériau conducteur (16) appartient à un boîtier (14) définissant ledit logement ou est mécaniquement rapporté à l'extérieur dudit boîtier (14) ou est déposé sur une face extérieure dudit boîtier (14).Motor vehicle headlamp, comprising a gas discharge lamp (10) associated with a supply circuit and mounted in a mirror (20), and shielding means (16, 30; 22, 40, 51) with respect to interfering electromagnetic emissions, characterized in that said supply circuit is received in a housing (15) associated with the lamp at the rear thereof, and in that the shielding means comprises a conductive material (16; 30) completely surrounding said housing and adapted to provide electrical continuity between a shielding braid of a power cable arriving at said housing and shielding arrangements associated with the mirror, and in that said conductive material (16) belongs to a housing (14) defining said housing or is mechanically attached to the outside of said housing (14) or is deposited on an outer face of said housing (14). Projecteur selon la revendication 1, ledit logement est défini par un boitier (14) définissant un connecteur (17) apte à coopérer avec un connecteur complémentaire (52) à l'extrêmité du câble d'alimentation.Projector according to claim 1, said housing is defined by a housing (14) defining a connector (17) adapted to cooperate with a complementary connector (52) at the end of the power cable. Projecteur selon l'une des revendications précédentes, caractérisé en ce qu'il comprend des premiers moyens de liaison (231, 251 ; 32) pour assurer la continuité électrique entre ledit matériau conducteur (16 ; 30) entourant ledit logement et un second matériau conducteur de blindage (22) prévu à la surface arrière du miroir (20).Projector according to one of the preceding claims, characterized in that it comprises first connecting means (231, 251; 32) for ensuring electrical continuity between said conductive material (16; 30) surrounding said housing and a second conductive material shielding member (22) provided on the rear surface of the mirror (20). Projecteur selon la revendication précédente, caractérisé en ce que les premiers moyens de liaison comprennent une série de griffes (231 ; 251) reliées électriquement audit second matériau conducteur (22) et en appui contre ledit premier matériau conducteur (16).Projector according to the preceding claim, characterized in that the first connecting means comprise a series of claws (231; 251) electrically connected to said second conductive material (22) and bearing against said first conductive material (16). Projecteur selon la revendication 4, caractérisé en ce que lesdites griffes (231) sont montées sur un porte-lampe (23, 60, PL) rapporté sur le miroir.Projector according to claim 4, characterized in that said claws (231) are mounted on a lamp holder (23, 60, PL) attached to the mirror. Projecteur selon la revendication 4 prise en combinaison avec la revendication 5, caractérisé en ce que les premiers moyens de liaison comprennent des aménagements (32) d'appui dudit couvercle (30) contre ledit second matériau conducteur (22) à l'arrière du miroir (20).Projector according to claim 4 taken in combination with claim 5, characterized in that the first connecting means comprise arrangements (32) for supporting said cover (30) against said second conductive material (22) at the rear of the mirror (20). Projecteur selon la revendication 3, caractérisé en ce que les premiers moyens de liaison comprennent un joint déformable en matériau électriquement conducteur, interposé entre les premier et second matériaux conducteurs.Projector according to claim 3, characterized in that the first connecting means comprise a deformable seal of electrically conductive material, interposed between the first and second conductive materials. Projecteur selon la revendication précédente, caractérisé en ce que le joint déformable est monté sur le miroir.Projector according to the preceding claim, characterized in that the deformable seal is mounted on the mirror. Projecteur selon la revendication 7, caractérisé en ce que le joint déformable est monté sur un porte-lampe (23, 60, PL) rapporté sur le miroir.Projector according to claim 7, characterized in that the deformable seal is mounted on a lamp holder (23, 60, PL) attached to the mirror. Projecteur selon l'une des revendications précédentes, caractérisé en ce qu'il comprend des deuxièmes moyens de liaison (521 ; 33) pour assurer la continuité électrique entre ledit matériau conducteur (16 ; 30) entourant ledit logement et ladite tresse de blindage (51).Projector according to one of the preceding claims, characterized in that it comprises second connecting means (521; 33) for providing electrical continuity between said conductive material (16; 30) surrounding said housing and said shielding braid (51 ). Projecteur selon la revendication 10, caractérisé en ce que le boîtier (14) de la lampe possède un premier connecteur (17), en ce que l'extrémité du câble d'alimentation (50) possède un second connecteur (52) apte à s'enficher avec le premier connecteur, et en ce que, lors de la séparation des premier et second connecteurs, lesdits deuxièmes moyens de liaison sont aptes à supprimer la continuité électrique entre ledit matériau conducteur (16 ; 30) entourant ledit logement et ladite tresse de blindage (51) seulement après que les contacts des premier et second connecteurs véhiculant la tension d'alimentation de la lampe se sont séparés.Projector according to claim 10, characterized in that the housing (14) of the lamp has a first connector (17), in that the end of the power cable (50) has a second connector (52) adapted to plugged with the first connector, and in that , during the separation of the first and second connectors, said second connecting means are able to suppress the electrical continuity between said conductive material (16; 30) surrounding said housing and said braid of shielding (51) only after the contacts of the first and second connectors carrying the supply voltage of the lamp have separated. Projecteur selon la revendication 10, caractérisé en ce que les deuxièmes moyens de liaison comprennent une série de griffes (52) portées par ledit second connecteur, lesdites griffes étant en contact avec la tresse de blindage (51) et avec le matériau conducteur (16a) entourant le boîtier.Projector according to claim 10, characterized in that the second connecting means comprise a series of claws (52) carried by said second connector, said claws being in contact with the shielding braid (51) and with the conducting material (16a). surrounding the case. Projecteur selon la revendication 10, caractérisé en ce que lesdits deuxièmes moyens de liaison comprennent un joint conducteur en contact avec la tresse de blindage (51) et avec le matériau conducteur (16a) entourant le boîtier.Projector according to claim 10, characterized in that said second connecting means comprise a conductive seal in contact with the shielding braid (51) and with the conductive material (16a) surrounding the housing. Projecteur selon la revendication 10, caractérisé en ce qu'il est prévu un moyen élastique (232 ; 242 ; 252) de retenue de la lampe en position axiale, ledit moyen s'appuyant contre le matériau conducteur de blindage (16), et en ce que ledit moyen élastique, qui est conducteur et qui, en position de retenue, est en contact avec ladite tresse de blindage (51) du câble, fait partie desdits deuxièmes moyens de liaison.Headlight according to Claim 10, characterized in that there is provided an elastic means (232; 242; 252) for retaining the lamp in the axial position, said means bearing against the conductive shielding material (16), and that said elastic means, which is conductive and which, in the retaining position, is in contact with said shielding braid (51) of the cable, part of said second connecting means. Projecteur selon la revendication 10, caractérisé en ce que lesdits deuxièmes moyens de liaison comprennent des aménagements (33) d'appui contre la tresse (51) du câble d'alimentation, formés sur ledit couvercle (30) autour d'un orifice pour le passage dudit câble (50).Projector according to claim 10, characterized in that said second connecting means comprise arrangements (33) for bearing against the braid (51) of the power cable, formed on said cover (30) around an orifice for the passage of said cable (50). Projecteur selon l'une des revendications précédentes, caractérisé en ce qu'il comprend un élément élastique conducteur (232 ; 242 ; 252) apte à s'appuyer contre ledit matériau conducteur (16) au niveau d'une face arrière dudit boîtier, pour assurer simultanément la retenue de la lampe en direction axiale et une continuité électrique de blindage avec d'autres éléments de blindage (22, 40, 51) du projecteur.Projector according to one of the preceding claims, characterized in that it comprises a conductive elastic element (232; 242; 252) adapted to bear against said conductive material (16) at a rear face of said housing, for simultaneously ensuring the retention of the lamp in the axial direction and electrical continuity of shielding with other shielding elements (22, 40, 51) of the projector. Projecteur selon l'une des revendications précédentes, caractérisé en ce que ledit logement (15) fait partie intégrante de la lampe.Projector according to one of the preceding claims, characterized in that said housing (15) is an integral part of the lamp. Projecteur selon l'une des revendications 1 à 16, caractérisé en ce que ledit logement fait partie d'un connecteur sur lequel la lampe est montée de façon amovible.Projector according to one of claims 1 to 16, characterized in that said housing is part of a connector on which the lamp is removably mounted. Projecteur selon l'une des revendications précédentes, caractérisé en ce qu'il comprend en outre des circuits de commande reçus dans un boîtier de commande électriquement conducteur situé à distance de la lampe, et des troisièmes moyens de liaison pour assurer la continuité électrique entre ledit boîtier de commande et la tresse du câble.Projector according to one of the preceding claims, characterized in that it further comprises control circuits received in an electrically conductive control box situated at a distance from the lamp, and third connection means for ensuring electrical continuity between said control box and the cable braid. Projecteur selon la revendication 19, caractérisé en ce que les troisièmes moyens de liaison comprennent un troisième connecteur prévu sur le boîtier de commande et un quatrième connecteur prévu à l'extrémité du câble d'alimentation (50) opposée à la lampe et apte à s'enficher avec le troisième connecteur, et en ce que, lors de la séparation des troisième et quatrième connecteurs, lesdits troisièmes moyens de liaison sont aptes à supprimer la continuité électrique entre ledit boîtier de commande et ladite tresse de blindage (51) seulement après que les contacts des troisième et quatrième connecteurs véhiculant la tension d'alimentation de la lampe se sont séparés.Projector according to claim 19, characterized in that the third connection means comprise a third connector provided on the control box and a fourth connector provided at the end of the supply cable (50) opposite the lamp and adapted to plugged with the third connector, and in that , during the separation of the third and fourth connectors, said third connecting means are able to suppress the electrical continuity between said control box and said shielding braid (51) only after the contacts of the third and fourth connectors carrying the supply voltage of the lamp have separated. Projecteur selon l'une des revendications précédentes, caractérisé en ce que le miroir possède, d'un seul tenant ou rapporté à celui-ci, un élément (23) en forme de cloche s'étendant à l'arrière du miroir autour du trou de lampe, et ouvert vers l'arrière, la lampe (10) étant montée de telle sorte que son boîtier (14) à matériau conducteur vienne partiellement s'engager dans ledit élément (23).Projector according to one of the preceding claims, characterized in that the mirror has, in one piece or attached thereto, a bell-shaped element (23) extending at the rear of the mirror around the hole of lamp, and open towards the rear, the lamp (10) being mounted so that its housing (14) of conductive material comes to partially engage in said element (23). Projecteur selon la revendication 21, caractérisé en ce que l'élément (23) porte à sa périphérie une pluralité de griffes (231) en métal à propriétés d'élasticité et aptes, lorsque la lampe (10) est mise en place, à venir en appui contre le matériau conducteur (16).Projector according to claim 21, characterized in that the element (23) carries at its periphery a plurality of claws (231) of metal with elastic properties and suitable, when the lamp (10) is put in place, to come resting against the conductive material (16). Projecteur selon la revendication 22, caractérisé en ce que lesdites griffes (231) sont reliées électriquement au matériau conducteur de blindage du type couche conductrice (22) prévu à l'arrière du miroir (20).Projector according to claim 22, characterized in that said claws (231) are electrically connected to the conductive conductive layer conductive material (22) provided at the rear of the mirror (20). Projecteur selon l'une des revendications précédentes, caractérisé en ce que le connecteur (17) est entouré d'une couche conductrice (16a).Projector according to one of the preceding claims, characterized in that the connector (17) is surrounded by a conductive layer (16a). Projecteur selon la revendication 2, caractérisé en ce qu'il a un connecteur (17) appartenant au boîtier (14) et qui est entouré d'une couche conductrice (16a), et en ce qu'il est prévu un connecteur complémentaire (52) à l'extrêmité du câble blindé d'alimentation qui porte une série de griffes élastiques et électriquement conductrices (521) aptes à venir s'appuyer, lorsque les connecteurs (17,52) sont assemblés, contre la couche conductrice (16a) du connecteur (17).Projector according to claim 2, characterized in that it has a connector (17) belonging to the housing (14) and which is surrounded by a conductive layer (16a), and that a complementary connector (52) is provided ) at the end of the shielded supply cable which carries a series of elastic and electrically conductive claws (521) able to bear, when the connectors (17,52) are assembled, against the conductive layer (16a) of the connector (17). Projecteur selon la revendication 25, caractérisé en ce que les griffes (521) sont complétées ou remplacées par un joint déformable en matériau électriquement conducteur comprimé entre les surfaces entre lesquelles la continuité de blindage doit être assurée.Projector according to claim 25, characterized in that the claws (521) are supplemented or replaced by a deformable seal of electrically conductive material compressed between the surfaces between which the continuity of shielding must be ensured. Projecteur selon l'une des revendications précédentes, caractérisé en ce qu'il comprend des connecteurs opérant entre l'extrêmité opposée du cable d'alimentation (50) et un boîtier de commande appartenant au projecteur et situé à distance de la lampe.Projector according to one of the preceding claims, characterized in that it comprises connectors operating between the opposite end of the power cable (50) and a control unit belonging to the projector and situated at a distance from the lamp. Lampe à décharge gazeuse (10) pour projecteur de véhicule automobile, ladite lampe étant associée à un circuit d'alimentation, caractérisée en ce qu'elle incorpore dans un logement (15) ledit circuit d'alimentation, et en ce qu'elle comprend en outre des moyens de blindage (16) comprenant un matériau conducteur entourant entièrement ledit logement et apte à assurer la continuité électrique entre une tresse de blindage d'un câble d'alimentation arrivant dans le logement et des aménagements de blindage prévus sur un miroir apte à recevoir ladite lampe, ledit matériau conducteur (16) appartenant à un boîtier (14) définissant ledit logement ou étant mécaniquement rapporté à l'extérieur dudit boîtier (14) ou étant déposé sur une face extérieure dudit boîtier (14).A gaseous discharge lamp (10) for a motor vehicle headlamp, said lamp being associated with a power supply circuit, characterized in that it incorporates in a housing (15) said power supply circuit, and in that it comprises in addition shielding means (16) comprising a conductive material completely surrounding said housing and adapted to provide electrical continuity between a shielding braid of a power cable arriving in the housing and shielding arrangements provided on a mirror adapted to receive said lamp, said conductive material (16) belonging to a housing (14) defining said housing or being mechanically attached to the outside of said housing (14) or deposited on an outer face of said housing (14) housing (14). Lampe selon la revendication précédente, caractérisé en ce que ledit logement est défini par un boitier (14) définissant un connecteur (17) apte à coopérer avec un connecteur complémentaire (52) à l'extrêmité du cable d'alimentation.Lamp according to the preceding claim, characterized in that said housing is defined by a housing (14) defining a connector (17) adapted to cooperate with a complementary connector (52) at the end of the power cable. Lampe selon la revendication précédente, caractérisé en ce que l'autre extrêmité du cable d'alimentation (50) possède un connecteur similaire au connecteur complémentaire (52).Lamp according to the preceding claim, characterized in that the other end of the power cable (50) has a similar connector to the complementary connector (52). Lampe (10) selon l'une des revendications 28 à 30, caractérisée en ce qu'un boîtier (14) définit le logement (15), ledit boîtier (14) étant d'un seul tenant avec le corps de la lampe (10) ou étant rapporté de façon amovible à l'arrière de la lampe (10).Lamp (10) according to one of claims 28 to 30, characterized in that a housing (14) defines the housing (15), said housing (14) being integral with the lamp body (10). ) or removably attached to the rear of the lamp (10).
EP20070007020 1999-07-02 2000-06-29 Vehicle headlight equipped with a gas discharge lamp and improved means for electromagnetic shielding Expired - Lifetime EP1798466B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9908549A FR2795691B1 (en) 1999-07-02 1999-07-02 MOTOR VEHICLE PROJECTOR EQUIPPED WITH A DISCHARGE LAMP AND IMPROVED ELECTROMAGNETIC SHIELDING MEANS
EP00401850A EP1065438B2 (en) 1999-07-02 2000-06-29 Vehicle headlight equipped with a gas discharge lamp and improved means for electromagnetic shielding

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EP00401850A Division EP1065438B2 (en) 1999-07-02 2000-06-29 Vehicle headlight equipped with a gas discharge lamp and improved means for electromagnetic shielding

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EP1798466A1 true EP1798466A1 (en) 2007-06-20
EP1798466B1 EP1798466B1 (en) 2015-05-13

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EP20070007020 Expired - Lifetime EP1798466B1 (en) 1999-07-02 2000-06-29 Vehicle headlight equipped with a gas discharge lamp and improved means for electromagnetic shielding

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ES2288148T5 (en) 2011-03-21
DE60034996T2 (en) 2008-01-24
DE60034996D1 (en) 2007-07-12
EP1798466B1 (en) 2015-05-13
FR2795691A1 (en) 2001-01-05
EP1065438B2 (en) 2011-01-12
EP1065438B1 (en) 2007-05-30
US6474856B2 (en) 2002-11-05
ES2288148T3 (en) 2008-01-01
EP1065438A1 (en) 2001-01-03
US20010030877A1 (en) 2001-10-18
FR2795691B1 (en) 2001-08-17
DE60034996T3 (en) 2011-05-19

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