WO2019110918A1 - Luminous module comprising a protective element for preventing the passage of electrostatic discharges between the exterior and interior of the luminous module - Google Patents

Luminous module comprising a protective element for preventing the passage of electrostatic discharges between the exterior and interior of the luminous module Download PDF

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Publication number
WO2019110918A1
WO2019110918A1 PCT/FR2018/053105 FR2018053105W WO2019110918A1 WO 2019110918 A1 WO2019110918 A1 WO 2019110918A1 FR 2018053105 W FR2018053105 W FR 2018053105W WO 2019110918 A1 WO2019110918 A1 WO 2019110918A1
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WO
WIPO (PCT)
Prior art keywords
light module
protective element
housing
light
support
Prior art date
Application number
PCT/FR2018/053105
Other languages
French (fr)
Inventor
Franck ARRIVET
Guillaume SITBON
Original Assignee
Automotive Lighting Rear Lamps France
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 Automotive Lighting Rear Lamps France filed Critical Automotive Lighting Rear Lamps France
Priority to EP18830911.6A priority Critical patent/EP3721137A1/en
Publication of WO2019110918A1 publication Critical patent/WO2019110918A1/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/10Protection of lighting devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141Light emitting diodes [LED]
    • F21S41/143Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/19Attachment of light sources or lamp holders

Definitions

  • the present invention relates to a light device for a motor vehicle, comprising electronic components sensitive to electrostatic discharges, for example light-emitting diodes. More specifically, the invention relates to a light module comprising a protection element to prevent the passage of electrostatic discharges between the outside and inside of the light module.
  • light devices favor the use of electronic components to form light-weight and high-power light sources, such as light emitting diodes (LEDs), organic light-emitting diodes (OLEDs), or laser diodes.
  • LEDs light emitting diodes
  • OLEDs organic light-emitting diodes
  • laser diodes laser diodes.
  • the placement of these luminous means along precise contours makes it possible to create original optical signatures.
  • these electronic components turn out to be particularly sensitive to electrostatic discharges.
  • the light sources are usually surrounded or at least near reflectors, concentrating the light emitted by said sources towards the front of the light device.
  • the reflectors are formed by a metal surface which has the disadvantage of allowing the passage of electrostatic discharges to the light sources. In order to prevent this, it is known to isolate the reflectors and light sources from the external environment by sealing them in an electrically non-conductive casing.
  • the various components of the housing are held in the housing by means of fixing screws, the heads of which are flush with the outside of the housing.
  • Fastening screws of a metallic nature are preferred because of their mechanical resistance to shocks and temperature variations.
  • the use of metal fixing screws has the disadvantage of forming conductive paths between the outside and the inside of the housing, allowing the passage of electrostatic discharges to the light sources through the reflectors.
  • the invention aims to remedy this, by proposing a light module for a motor vehicle, comprising a protective element to prevent the passage of electrostatic discharges between the outside and the inside of the light module by means of screws. metal fixation.
  • the present invention proposes a light module for a motor vehicle comprising a housing in which are present an electrically conductive support and at least one half-light source. conductor, in contact or near the support, the light module also comprises at least one electrically conductive fastening means comprising a first portion outside the housing and a second portion passing near or through the support.
  • the invention is remarkable in that the light module comprises a protective element against electrostatic discharges, interposed between the second part of the fixing element and the support, and in that the protective element extends the along the second part of the fixing means so as to prevent the passage of an electrostatic discharge between the fixing means and the support.
  • the invention therefore proposes to interpose a protective element between the fixing means and the support, the protective element being configured to prevent the passage of electrostatic discharges.
  • the electrically conductive fixing means can be used for their mechanical resistance to shock and temperature, while limiting the risk of damage to light sources by electrostatic discharges through said fixing means.
  • the protective element is formed from a plastic material of acrylonitrile butadiene styrene (ABS), polycarbonate (PC) or a mixture of both.
  • the thickness of the protective element is between 1 mm and 10 mm or between 2 mm and
  • the thickness of the protective element is chosen so as to prevent the passage of an electrostatic discharge through the protective element.
  • the thickness of the protective element is also chosen to minimize its bulk in the housing. By the term thickness is meant the smallest distance separating the opposite faces of a wall of the protective element.
  • the protective element extends along the second part of the fastening means, so that the path bypassing the shortest protective element between the means of fixing and support, is equal to or greater than 20 mm. According to another embodiment, the protective element extends beyond the second part of the fixing means.
  • the protective element is a wall interposed between the electrically conductive support and the second part of the fixing means.
  • the protective element is a sheath surrounding partially or completely the second part of the fastening means.
  • the length of the sheath varies around the fixing means.
  • Length means a dimension of the sheath in a direction substantially parallel to the longitudinal axis of the fastening means.
  • a side wall of the protective element is shorter when said side wall is vis-à-vis a non-conductive element. This embodiment aims to limit the bulk of the protective element in areas of the housing not comprising an electrically conductive support.
  • the protective member extends from an inner face of the housing. This embodiment aims to allow better electrical insulation all along the second part of the fastening means.
  • the protective element is integral with the inner face of the housing.
  • the protective element forms an outgrowth of an inner face of the housing.
  • the fixing means is reversible.
  • the fixing means is a fixing screw comprising a head flush with the outside of the housing and a threaded rod extending inside the housing.
  • the support is an electronic card comprising conductive tracks connected to at least one light source or an optical reflector comprising a metal layer.
  • the semiconductor light source is a light emitting diode.
  • the invention also relates to a signaling and / or lighting device for a motor vehicle, comprising one of the light modules described above.
  • the invention also relates to a motor vehicle comprising a signaling and / or lighting device described above.
  • Figure 1 shows a cross section of a light module according to the invention comprising a protective element against electrostatic discharges from outside the light module.
  • the invention proposes a light module for a motor vehicle, comprising a protective element to prevent the passage of electrostatic discharges between the outside and the inside of the light module.
  • FIG. 1 shows an embodiment of a light module 2 according to the invention.
  • the light module comprises a housing 4 composed of a rear portion 6 forming a housing 8, closed by a front portion 10 of the housing.
  • the housing 8 accommodates at least one semiconductor light source, in this case a light emitting diode 12, arranged on an electronic card 14.
  • the electronic card comprises on its surface conductive tracks 16 allowing a unit of control not shown in Figure 1, to control the operation of the light emitting diode 12.
  • the electronic card is arranged in the bottom of the housing 8 so that the light emitting diode illuminates the front portion 10 of the housing.
  • the front portion 10 is transparent and / or translucent to the light beam emitted by the light emitting diode 12 to display a light signal and / or illuminate a scene.
  • the light module 2 according to the invention may be a signaling device and / or a lighting device for a motor vehicle.
  • the light module 2 comprises an optical reflector 18 arranged between the electronic card 14 and the front portion of the housing 4, so as to control the direction of the light beam emitted by the light-emitting diode 12.
  • the reflector consists of a support covered with a metal layer reflecting light.
  • the electronic board 14 and the reflector 18 are held in the rear portion 6 of the housing, via lugs 20 extending from an inner face 22 of the rear portion.
  • the rear portion 6 is held at the front portion 10 of the housing by means of fastening means, in this case metal screws 24A and 24B. More specifically, the rear portion 6 is traversed by passages 26 configured to block a first portion of the screws, in this case their head 28A and 28B, and pass a second portion formed by their threaded rod 30A and 30B.
  • the front portion 10 of the housing comprises at its inner face 32 protuberances 34. Each protuberance forms a cavity vis-à-vis a passage 26, intended to receive the threaded rod of a screw 24A or 24B, so to allow the maintenance of the rear portion 6 to the front portion 10. It should be noted that the screw 24A passes through one end 36 of the reflector to ensure better maintenance of the latter, between the front portion 10 and the portion rear 6 of the light module.
  • the screw 24B does not cross the reflector 18 but is located near the latter.
  • the heads 26A and 26B of the screws are flush with the outside of the light module 2 and the light module is partly crossed by their threaded rod 30A and 30B.
  • the screws are made from metallic materials because of their property of mechanical resistance to shocks and temperature variations.
  • the metallic nature of the screws nevertheless has the disadvantage of forming electrically conductive passages, allowing the formation of electrostatic discharges between the outside and the inside of the light module.
  • a protection element is formed by an outgrowth of the rear part. 6 of the light module at its inner face 22.
  • Each protrusion forms a sheath 38 encircling a threaded rod of a screw.
  • the sheath also surrounds the protrusion 34 in which the screws 24A and 24B are screwed.
  • each protrusion of the rear portion 6 forms a side wall 40, 40A, 40B extending along a threaded rod.
  • the side wall 40, 40A, 40B preferably completely surrounds the threaded rods of the screws.
  • the side wall forming the sheaths 38 is of plastic material, identical in nature to the rear portion 6 of the light module 2.
  • the rear portion 6 of the light module is made from one of the materials acrylonitrile butadiene styrene (ABS), polycarbonate (PC) or a mixture of both.
  • ABS acrylonitrile butadiene styrene
  • PC polycarbonate
  • the thickness of the side wall 40, 40A, 40B is chosen to prevent the passage of electrostatic discharges through the sheath 38. Depending on the material forming the sheath, the thickness of the side wall is between 2 mm and 3 mm.
  • the side wall of the sheaths 38 extends along a threaded rod so that the shortest path C between the threaded rod and the reflector 18, passing between an appendage 34 and a sheath 38, is equal to or greater than 20 mm. If necessary, the side wall of a sheath may extend beyond the end of a threaded rod.
  • the sheath thus makes it possible to prevent the formation of an electrostatic discharge by means of the screws 24A and 24B, between the outside of the light module 2 and the reflector 18. As a result, the light reflector is less likely to transmit a light. electrostatic discharge to the light-emitting diode 10 may damage it.
  • the side wall forming the sheath 38 varies in length around the threaded rod 30B.
  • length is meant a dimension of the sheath in a substantially longitudinal direction to the threaded rod that surrounds.
  • the sheath serves to prevent the passage of an electrostatic discharge between the threaded rod and an electrically conductive element present in the light module 2.
  • the side wall 40B of the sheath 38 can thus be of reduced length relative to the side wall 40A when the side wall 40B is not vis-à-vis an electrically conductive element. This advantageously reduces the size of the sheath in the light module to facilitate its integration.
  • the embodiment described above may include the following variants.
  • the cross section of a sheath may be oval or pentagonal, preferably circular or square.
  • the length of the sheath around a threaded rod may vary between 200% and 0% of the length of the threaded rod, preferably between 60% and 30%.
  • the length of a sheath may be zero over part of its contour so as to form a more or less curved wall, interposed between an electrically conductive element and a threaded rod.
  • the sheath may be formed by a separate element of the rear portion 6 of the light module.

Landscapes

  • 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)

Abstract

Luminous module comprising a protective element for preventing the passage of electrostatic discharges between the exterior and interior of the luminous module. The invention relates to a luminous module (2) for a motor vehicle, said module comprising a protective element (38) for preventing the passage of electrostatic discharges between the exterior and interior of the luminous module. The luminous module comprises a casing (4) including an electrically conductive holder (18) and a light source (12) in contact with or in proximity to the holder (18). The luminous module (2) comprises one or more electrically conductive fastening means (24A, 24B) a first portion (28A, 28B) and a second portion (30A, 30B) of which are present on the exterior and in the interior of the casing (4), respectively. The luminous module (2) comprises a protective element (38) interposed between the second portion (30A, 30B) and the holder (18), the protective element (38) extending along the second portion (30A, 30B) so as to prevent the passage of an electrostatic discharge between the fastening means (24A, 24B) and the holder (18).

Description

MODULE LUMINEUX COMPRENANT UN ELEMENT DE  LUMINOUS MODULE COMPRISING AN ELEMENT OF
PROTECTION POUR PREVENIR LE PASSAGE DE DECHARGES ELECTROSTATIQUES ENTRE L’EXTERIEUR ET L’INTERIEUR DU MODULE  PROTECTION TO PREVENT THE MOVEMENT OF ELECTROSTATIC DISCHARGES BETWEEN THE OUTER AND THE INTERIOR OF THE MODULE
LUMINEUX.  LUMINOUS.
DOMAINE TECHNIQUE AUQUEL SE RAPPORTE L'INVENTION TECHNICAL FIELD TO WHICH THE INVENTION REFERS
[01] La présente invention concerne un dispositif lumineux pour véhicule automobile, comprenant des composants électroniques sensibles à des décharges électrostatiques, par exemple des diodes électroluminescentes. Plus précisément, l’invention concerne un module lumineux comprenant un élément de protection pour prévenir le passage de décharges électrostatiques entre l’extérieur et l’intérieur du module lumineux. [01] The present invention relates to a light device for a motor vehicle, comprising electronic components sensitive to electrostatic discharges, for example light-emitting diodes. More specifically, the invention relates to a light module comprising a protection element to prevent the passage of electrostatic discharges between the outside and inside of the light module.
ARRIERE-PLAN TECHNOLOGIQUE BACKGROUND
[02] Dans le domaine de l’automobile, les dispositifs lumineux privilégient l’emploi de composants électroniques pour former des sources de lumière de faible encombrement et de forte puissance, de type diodes électroluminescentes (LEDs), diodes électroluminescentes organiques (OLED), ou diodes laser. Le placement de ces moyens lumineux le long de contours précis permet en effet de créer des signatures optiques originales. Cependant, ces composants électroniques s’avèrent être particulièrement sensibles aux décharges électrostatiques. Or, les sources de lumière sont habituellement entourées ou du moins à proximité de réflecteurs, concentrant la lumière émise par lesdites sources vers l’avant du dispositif lumineux. Les réflecteurs sont formés par une surface métallique qui a pour inconvénient de permettre le passage de décharges électrostatiques jusqu’aux sources de lumière. Afin de prévenir de cela, il est connu d’isoler de l’environnement extérieur les réflecteurs et les sources de lumière, en les scellant dans un boîtier électriquement non conducteur. [02] In the automotive field, light devices favor the use of electronic components to form light-weight and high-power light sources, such as light emitting diodes (LEDs), organic light-emitting diodes (OLEDs), or laser diodes. The placement of these luminous means along precise contours makes it possible to create original optical signatures. However, these electronic components turn out to be particularly sensitive to electrostatic discharges. However, the light sources are usually surrounded or at least near reflectors, concentrating the light emitted by said sources towards the front of the light device. The reflectors are formed by a metal surface which has the disadvantage of allowing the passage of electrostatic discharges to the light sources. In order to prevent this, it is known to isolate the reflectors and light sources from the external environment by sealing them in an electrically non-conductive casing.
[03] Les différents éléments composants le boîtier sont maintenus au boîtier par l’intermédiaire de vis de fixation, dont les têtes affleurent à l’extérieur du boîtier. Les vis de fixation de nature métallique sont privilégiées en raison de leurs résistances mécaniques aux chocs et aux variations de température. Cependant, l’utilisation de vis de fixation métallique a pour inconvénient de former des voies conductrices entre l’extérieur et l’intérieur du boîtier, permettant le passage de décharges électrostatiques jusqu’aux sources de lumière par l’intermédiaire des réflecteurs. [03] The various components of the housing are held in the housing by means of fixing screws, the heads of which are flush with the outside of the housing. Fastening screws of a metallic nature are preferred because of their mechanical resistance to shocks and temperature variations. However, the use of metal fixing screws has the disadvantage of forming conductive paths between the outside and the inside of the housing, allowing the passage of electrostatic discharges to the light sources through the reflectors.
[04] L’invention vise à remédier à cela, en proposant un module lumineux pour véhicule automobile, comprenant un élément protecteur pour prévenir le passage de décharges électrostatiques entre l’extérieur et l’intérieur du module lumineux par l’intermédiaire de vis de fixation métallique. OBJET DE L’INVENTION [04] The invention aims to remedy this, by proposing a light module for a motor vehicle, comprising a protective element to prevent the passage of electrostatic discharges between the outside and the inside of the light module by means of screws. metal fixation. OBJECT OF THE INVENTION
[05] Afin de remédier à l’inconvénient précité de l’état de la technique, la présente invention propose un module lumineux pour véhicule automobile comprenant un boîtier dans lequel sont présents un support électriquement conducteur et au moins une source de lumière à semi-conducteur, en contact ou à proximité du support, le module lumineux comprend également au moins un moyen de fixation électriquement conducteur comprenant une première partie présente à l’extérieur du boîtier et une deuxième partie passant à proximité ou à travers le support. [05] In order to overcome the aforementioned drawback of the state of the art, the present invention proposes a light module for a motor vehicle comprising a housing in which are present an electrically conductive support and at least one half-light source. conductor, in contact or near the support, the light module also comprises at least one electrically conductive fastening means comprising a first portion outside the housing and a second portion passing near or through the support.
[06] L’invention est remarquable en ce que le module lumineux comprend un élément protecteur contre des décharges électrostatiques, interposé entre la deuxième partie de l’élément de fixation et le support, et en ce que l’élément protecteur s’étend le long de la deuxième partie du moyen de fixation de manière à prévenir le passage d’une décharge électrostatique entre le moyen de fixation et le support. [07] L’invention propose donc d’interposer un élément protecteur entre le moyen de fixation et le support, l’élément protecteur étant configuré pour empêcher le passage de décharges électrostatiques. Ainsi, les moyens de fixation électriquement conducteurs peuvent être utilisés pour leurs qualités de résistance mécaniques aux chocs et aux températures, tout en limitant le risque d’endommagement des sources de lumière par des décharges électrostatiques passant par lesdits moyens de fixation. [08] Selon une variante de réalisation de l’invention, l’élément protecteur est formé à partir d’un matériau plastique de type acrylonitrile butadiène styrène (ABS), polycarbonate (PC) ou un mélange des deux. [06] The invention is remarkable in that the light module comprises a protective element against electrostatic discharges, interposed between the second part of the fixing element and the support, and in that the protective element extends the along the second part of the fixing means so as to prevent the passage of an electrostatic discharge between the fixing means and the support. [07] The invention therefore proposes to interpose a protective element between the fixing means and the support, the protective element being configured to prevent the passage of electrostatic discharges. Thus, the electrically conductive fixing means can be used for their mechanical resistance to shock and temperature, while limiting the risk of damage to light sources by electrostatic discharges through said fixing means. [08] According to an alternative embodiment of the invention, the protective element is formed from a plastic material of acrylonitrile butadiene styrene (ABS), polycarbonate (PC) or a mixture of both.
[09] Selon une autre variante de réalisation de l’invention, l’épaisseur de l’élément protecteur est comprise entre 1 mm et 10 mm ou entre 2 mm et[09] According to another embodiment of the invention, the thickness of the protective element is between 1 mm and 10 mm or between 2 mm and
8 mm, de préférence entre 2 mm et 3 mm. En d’autres termes, l’épaisseur de l’élément protecteur est choisie de manière à empêcher le passage d’une décharge électrostatique à travers l’élément protecteur. L’épaisseur de l’élément protecteur est également choisie pour minimiser son encombrement dans le boîtier. Par le terme épaisseur, on entend la plus petite distance séparant les faces opposées d’une paroi de l’élément protecteur. 8 mm, preferably between 2 mm and 3 mm. In other words, the thickness of the protective element is chosen so as to prevent the passage of an electrostatic discharge through the protective element. The thickness of the protective element is also chosen to minimize its bulk in the housing. By the term thickness is meant the smallest distance separating the opposite faces of a wall of the protective element.
[10] Selon une autre variante de réalisation de l’invention, l’élément protecteur s’étend le long de la deuxième partie du moyen de fixation, de sorte que le chemin contournant l’élément protecteur le plus court, entre le moyen de fixation et le support, est égal ou supérieur à 20 mm. Selon un autre mode de réalisation, l’élément protecteur s’étend au-delà de la deuxième partie du moyen de fixation. [10] According to another embodiment of the invention, the protective element extends along the second part of the fastening means, so that the path bypassing the shortest protective element between the means of fixing and support, is equal to or greater than 20 mm. According to another embodiment, the protective element extends beyond the second part of the fixing means.
[11] Selon une autre variante de réalisation de l’invention, l’élément protecteur est une paroi interposée entre le support électriquement conducteur et la deuxième partie du moyen de fixation. [11] According to another embodiment of the invention, the protective element is a wall interposed between the electrically conductive support and the second part of the fixing means.
[12] Selon une autre variante de réalisation de l’invention, l’élément protecteur est une gaine entourant partiellement ou complètement la deuxième partie du moyen de fixation. Selon un autre mode de réalisation, la longueur de la gaine varie autour du moyen de fixation. Par le terme[12] According to another embodiment of the invention, the protective element is a sheath surrounding partially or completely the second part of the fastening means. According to another embodiment, the length of the sheath varies around the fixing means. By the term
« longueur », on entend une dimension de la gaine selon une direction sensiblement parallèle à l’axe longitudinal du moyen de fixation. Selon un mode de réalisation préféré, une paroi latérale de l’élément protecteur est plus courte lorsque ladite paroi latérale est en vis-à-vis d’un élément non conducteur. Ce mode de réalisation vise à limiter l’encombrement de l’élément protecteur dans des zones du boîtier ne comprenant pas de support électriquement conducteur. "Length" means a dimension of the sheath in a direction substantially parallel to the longitudinal axis of the fastening means. According to a preferred embodiment, a side wall of the protective element is shorter when said side wall is vis-à-vis a non-conductive element. This embodiment aims to limit the bulk of the protective element in areas of the housing not comprising an electrically conductive support.
[13] Selon une autre variante de réalisation de l’invention, l’élément protecteur s’étend à partir d’une face interne du boîtier. Ce mode de réalisation vise à permettre une meilleure isolation électrique tout le long de la deuxième partie du moyen de fixation. Selon un mode de réalisation préféré, l’élément protecteur est solidaire de la face interne du boîtier. Selon un autre mode de réalisation préféré, l’élément protecteur forme une excroissance d’une face interne du boîtier. [14] Selon une autre variante de réalisation de l’invention, le moyen de fixation est réversible. Selon un mode de réalisation préféré, le moyen de fixation est une vis de fixation comprenant une tête affleurant l’extérieur du boîtier et une tige filetée s’étendant à l’intérieur du boîtier. [13] According to another embodiment of the invention, the protective member extends from an inner face of the housing. This embodiment aims to allow better electrical insulation all along the second part of the fastening means. According to a preferred embodiment, the protective element is integral with the inner face of the housing. According to another preferred embodiment, the protective element forms an outgrowth of an inner face of the housing. [14] According to another embodiment of the invention, the fixing means is reversible. According to a preferred embodiment, the fixing means is a fixing screw comprising a head flush with the outside of the housing and a threaded rod extending inside the housing.
[15] Selon une autre variante de réalisation de l’invention, le support est une carte électronique comprenant des pistes conductrices connectées à au moins une source de lumière ou un réflecteur optique comprenant une couche métallique. [15] According to another embodiment of the invention, the support is an electronic card comprising conductive tracks connected to at least one light source or an optical reflector comprising a metal layer.
[16] Selon une autre variante de réalisation de l’invention, la source de lumière à semi-conducteur est une diode électroluminescente. [17] Bien entendu, les différentes caractéristiques, variantes et formes de réalisation mentionnées ci-dessus peuvent être associées les unes avec les autres selon diverses combinaisons, dans la mesure où elles ne sont pas incompatibles ou exclusives les unes des autres. [16] According to another embodiment of the invention, the semiconductor light source is a light emitting diode. [17] Of course, the various features, variations and embodiments mentioned above may be associated with each other in various combinations, to the extent that they are not incompatible or exclusive of each other.
[18] L’invention concerne également un dispositif de signalisation et/ou d’éclairage pour véhicule automobile, comprenant l’un des modules lumineux décrits ci-dessus. [18] The invention also relates to a signaling and / or lighting device for a motor vehicle, comprising one of the light modules described above.
[19] L’invention concerne aussi un véhicule automobile comprenant un dispositif de signalisation et/ou d’éclairage décrit ci-dessus. [19] The invention also relates to a motor vehicle comprising a signaling and / or lighting device described above.
DESCRIPTION DES FIGURES [20] La description qui va suivre en regard de la figure 1 annexée, donnée à titre d’exemple non limitatif, permettra de mieux comprendre en quoi consiste l’invention et comment elle peut être réalisée. La figure 1 représente une coupe transversale d’un module lumineux selon l’invention comprenant un élément protecteur contre des décharges électrostatiques provenant de l’extérieur du module lumineux. DESCRIPTION OF THE FIGURES [20] The following description with reference to Figure 1 attached, given by way of non-limiting example, will better understand what the invention is and how it can be achieved. Figure 1 shows a cross section of a light module according to the invention comprising a protective element against electrostatic discharges from outside the light module.
DESCRIPTION DETAILLEE D’UN EXEMPLE DE RÉALISATION DETAILED DESCRIPTION OF AN EXEMPLARY EMBODIMENT
[21] Pour rappel, l’invention propose un module lumineux pour véhicule automobile, comprenant un élément protecteur pour prévenir le passage de décharges électrostatiques entre l’extérieur et l’intérieur du module lumineux. [21] As a reminder, the invention proposes a light module for a motor vehicle, comprising a protective element to prevent the passage of electrostatic discharges between the outside and the inside of the light module.
[22] La figure 1 présente un mode de réalisation d’un module lumineux 2 selon l’invention. Le module lumineux comprend un boîtier 4 composé d’une partie arrière 6 formant un logement 8, obturé par une partie avant 10 du boîtier. [23] Le logement 8 accueille au moins une source de lumière à semi- conducteur, dans le cas présent une diode électroluminescente 12, agencée sur une carte électronique 14. La carte électronique comporte à sa surface des pistes conductrices 16 permettant à une unité de commande non représentée sur la figure 1 , de contrôler le fonctionnement de la diode électroluminescente 12. La carte électronique est agencée dans le fond du logement 8 de manière à ce que la diode électroluminescente éclaire la partie avant 10 du boîtier. La partie avant 10 est transparente et/ou translucide au faisceau de lumière émis par la diode électroluminescente 12 afin d’afficher un signal lumineux et/ou éclairer une scène. En d’autres termes, le module lumineux 2 selon l’invention peut être un dispositif de signalisation et/ou un dispositif d’éclairage pour un véhicule automobile. [22] Figure 1 shows an embodiment of a light module 2 according to the invention. The light module comprises a housing 4 composed of a rear portion 6 forming a housing 8, closed by a front portion 10 of the housing. [23] The housing 8 accommodates at least one semiconductor light source, in this case a light emitting diode 12, arranged on an electronic card 14. The electronic card comprises on its surface conductive tracks 16 allowing a unit of control not shown in Figure 1, to control the operation of the light emitting diode 12. The electronic card is arranged in the bottom of the housing 8 so that the light emitting diode illuminates the front portion 10 of the housing. The front portion 10 is transparent and / or translucent to the light beam emitted by the light emitting diode 12 to display a light signal and / or illuminate a scene. In other words, the light module 2 according to the invention may be a signaling device and / or a lighting device for a motor vehicle.
[24] De façon connue, le module lumineux 2 comprend un réflecteur 18 optique agencé entre la carte électronique 14 et la partie avant du boîtier 4, de manière à contrôler la direction du faisceau de lumière émis par la diode électroluminescente 12. Selon le présent exemple, le réflecteur se compose d’un support recouvert d’une couche métallique réfléchissant la lumière. La carte électronique 14 et le réflecteur 18 sont maintenus dans la partie arrière 6 du boîtier, par l’intermédiaire d’ergots 20 s’étendant à partir d’une face interne 22 de la partie arrière. [24] In known manner, the light module 2 comprises an optical reflector 18 arranged between the electronic card 14 and the front portion of the housing 4, so as to control the direction of the light beam emitted by the light-emitting diode 12. According to the present invention for example, the reflector consists of a support covered with a metal layer reflecting light. The electronic board 14 and the reflector 18 are held in the rear portion 6 of the housing, via lugs 20 extending from an inner face 22 of the rear portion.
[25] La partie arrière 6 est maintenue à la partie avant 10 du boîtier par l’intermédiaire de moyens de fixation, dans le cas présent des vis 24A et 24B en métal. Plus précisément, la partie arrière 6 est traversée par des passages 26 configurés pour bloquer une première partie des vis, dans le cas présent leur tête 28A et 28B, et laisser passer une deuxième partie formée par leur tige filetée 30A et 30B. La partie avant 10 du boîtier comprend au niveau de sa face interne 32 des protubérances 34. Chaque protubérance forme une cavité en vis-à-vis d’un passage 26, destinée à accueillir la tige filetée d’une vis 24A ou 24B, afin de permettre le maintien de la partie arrière 6 à la partie avant 10. Il est à noter que la vis 24A passe à travers une extrémité 36 du réflecteur afin d’assurer un meilleur maintien de ce dernier, entre la partie avant 10 et la partie arrière 6 du module lumineux.[25] The rear portion 6 is held at the front portion 10 of the housing by means of fastening means, in this case metal screws 24A and 24B. More specifically, the rear portion 6 is traversed by passages 26 configured to block a first portion of the screws, in this case their head 28A and 28B, and pass a second portion formed by their threaded rod 30A and 30B. The front portion 10 of the housing comprises at its inner face 32 protuberances 34. Each protuberance forms a cavity vis-à-vis a passage 26, intended to receive the threaded rod of a screw 24A or 24B, so to allow the maintenance of the rear portion 6 to the front portion 10. It should be noted that the screw 24A passes through one end 36 of the reflector to ensure better maintenance of the latter, between the front portion 10 and the portion rear 6 of the light module.
À l’inverse, la vis 24B ne traverse pas le réflecteur 18 mais est située à proximité de ce dernier. Conversely, the screw 24B does not cross the reflector 18 but is located near the latter.
[26] Les têtes 26A et 26B des vis affleurent donc à l’extérieur du module lumineux 2 et le module lumineux est en partie traversé par leur tige filetée 30A et 30B. Comme mentionné ci-dessus, les vis sont réalisées à partir de matériaux métalliques en raison de leur propriété de résistance mécanique aux chocs et aux variations de température. La nature métallique des vis a néanmoins l’inconvénient de former des passages électriquement conducteurs, permettant la formation de décharges électrostatiques entre l’extérieur et l’intérieur du module lumineux. [26] The heads 26A and 26B of the screws are flush with the outside of the light module 2 and the light module is partly crossed by their threaded rod 30A and 30B. As mentioned above, the screws are made from metallic materials because of their property of mechanical resistance to shocks and temperature variations. The metallic nature of the screws nevertheless has the disadvantage of forming electrically conductive passages, allowing the formation of electrostatic discharges between the outside and the inside of the light module.
[27] Afin de remédier à ce problème, l’invention propose d’insérer un élément de protection à l’intérieur du module lumineux 2. Plus précisément, un élément de protection selon le présent exemple est formé par une excroissance de la partie arrière 6 du module lumineux au niveau de sa face interne 22. Chaque excroissance forme une gaine 38 encerclant une tige filetée d’une vis. Bien entendu, la gaine entoure également la protubérance 34 dans laquelle les vis 24A et 24B sont vissées. En d’autres termes, chaque excroissance de la partie arrière 6 forme une paroi latérale 40, 40A, 40B s’étendant le long d’une tige filetée. La paroi latérale 40, 40A, 40B entoure de préférence complètement les tiges filetées des vis. [27] In order to remedy this problem, the invention proposes to insert a protection element inside the light module 2. More precisely, a protection element according to the present example is formed by an outgrowth of the rear part. 6 of the light module at its inner face 22. Each protrusion forms a sheath 38 encircling a threaded rod of a screw. Of course, the sheath also surrounds the protrusion 34 in which the screws 24A and 24B are screwed. In other words, each protrusion of the rear portion 6 forms a side wall 40, 40A, 40B extending along a threaded rod. The side wall 40, 40A, 40B preferably completely surrounds the threaded rods of the screws.
[28] Selon le présent exemple, la paroi latérale formant les gaines 38 est en matériau plastique, de nature identique à la partie arrière 6 du module lumineux 2. La partie arrière 6 du module lumineux est réalisée à partir de l’un des matériaux suivants : acrylonitrile butadiène styrène (ABS), polycarbonate (PC) ou un mélange des deux. L’épaisseur de la paroi latérale 40, 40A, 40B est choisie de manière à empêcher le passage de décharges électrostatiques à travers la gaine 38. En fonction du matériau formant la gaine, l’épaisseur de la paroi latérale est comprise entre 2 mm et 3 mm. [28] According to the present example, the side wall forming the sheaths 38 is of plastic material, identical in nature to the rear portion 6 of the light module 2. The rear portion 6 of the light module is made from one of the materials acrylonitrile butadiene styrene (ABS), polycarbonate (PC) or a mixture of both. The thickness of the side wall 40, 40A, 40B is chosen to prevent the passage of electrostatic discharges through the sheath 38. Depending on the material forming the sheath, the thickness of the side wall is between 2 mm and 3 mm.
[29] Selon l’invention, la paroi latérale des gaines 38 s’étend le long d’une tige filetée de sorte que le chemin C le plus court entre la tige filetée et le réflecteur 18, passant entre un appendice 34 et une gaine 38, est égal ou supérieur à 20 mm. Si besoin, la paroi latérale d’une gaine peut s’étendre au- delà de l’extrémité d’une tige filetée. La gaine permet ainsi d’éviter la formation d’une décharge électrostatique par l’intermédiaire des vis 24A et 24B, entre l’extérieur du module lumineux 2 et le réflecteur 18. De ce fait, le réflecteur lumineux est moins susceptible de transmettre une décharge électrostatique à la diode électroluminescente 10 pouvant l’endommager. [29] According to the invention, the side wall of the sheaths 38 extends along a threaded rod so that the shortest path C between the threaded rod and the reflector 18, passing between an appendage 34 and a sheath 38, is equal to or greater than 20 mm. If necessary, the side wall of a sheath may extend beyond the end of a threaded rod. The sheath thus makes it possible to prevent the formation of an electrostatic discharge by means of the screws 24A and 24B, between the outside of the light module 2 and the reflector 18. As a result, the light reflector is less likely to transmit a light. electrostatic discharge to the light-emitting diode 10 may damage it.
[30] Il est à noter que la paroi latérale formant la gaine 38 varie en longueur autour de la tige filetée 30B. Par le terme « longueur », on entend une dimension de la gaine selon une direction sensiblement longitudinale à la tige filetée qu’elle entoure. En effet, comme mentionné ci-dessus, la gaine a pour fonction d’empêcher le passage d’une décharge électrostatique entre la tige filetée et un élément électriquement conducteur présent dans le module lumineux 2. La paroi latérale 40B de la gaine 38 peut ainsi être de longueur réduite par rapport à la paroi latérale 40A lorsque la paroi latérale 40B n’est pas en vis-à-vis d’un élément électriquement conducteur. Cela permet avantageusement de réduire l’encombrement de la gaine dans le module lumineux afin de faciliter son intégration. [31] Le mode de réalisation décrit ci-dessus peut comporter les variantes suivantes. [30] It should be noted that the side wall forming the sheath 38 varies in length around the threaded rod 30B. By the term "length" is meant a dimension of the sheath in a substantially longitudinal direction to the threaded rod that surrounds. Indeed, as mentioned above, the sheath serves to prevent the passage of an electrostatic discharge between the threaded rod and an electrically conductive element present in the light module 2. The side wall 40B of the sheath 38 can thus be of reduced length relative to the side wall 40A when the side wall 40B is not vis-à-vis an electrically conductive element. This advantageously reduces the size of the sheath in the light module to facilitate its integration. [31] The embodiment described above may include the following variants.
[32] Selon une première variante, la section transversale d’une gaine peut être de forme ovale ou pentagonale, de préférence de forme circulaire ou carrée. [32] According to a first variant, the cross section of a sheath may be oval or pentagonal, preferably circular or square.
[33] Selon une deuxième variante, la longueur de la gaine autour d’une tige filetée peut varier entre 200% et 0% de la longueur de la tige filetée, de préférence entre 60% et 30%. [33] According to a second variant, the length of the sheath around a threaded rod may vary between 200% and 0% of the length of the threaded rod, preferably between 60% and 30%.
[34] Selon une troisième variante, la longueur d’une gaine peut être nulle sur une partie de son contour de sorte à former une paroi plus ou moins courbe, interposée entre un élément électriquement conducteur et une tige filetée. [34] According to a third variant, the length of a sheath may be zero over part of its contour so as to form a more or less curved wall, interposed between an electrically conductive element and a threaded rod.
[35] Selon une quatrième variante, la gaine peut être formée par un élément distinct de la partie arrière 6 du module lumineux. [35] According to a fourth variant, the sheath may be formed by a separate element of the rear portion 6 of the light module.

Claims

REVENDICATIONS
1. Module lumineux (2) pour véhicule automobile comprenant un boîtier (4) dans lequel sont présents un support (18) électriquement conducteur et au moins une source de lumière (12) à semi-conducteur en contact ou à proximité du support (18), le module lumineux (2) comprend également au moins un moyen de fixation (24A, 24B) électriquement conducteur comprenant une première partie (28A, 28B) présente à l’extérieur du boîtier (4) et une deuxième partie (30A, 30B) passant à proximité ou à travers le support (18), caractérisé en ce que le module lumineux (2) comprend un élément protecteur (38) contre des décharges électrostatiques, interposé entre la deuxième partie (30A, 30B) de l’élément de fixation et le support (18), et en ce que l’élément protecteur (38) s’étend le long de la deuxième partie (30A, 30B) du moyen de fixation (24A, 24B) de manière à prévenir le passage d’une décharge électrostatique entre le moyen de fixation (24A, 24B) et le support (18). A light module (2) for a motor vehicle comprising a housing (4) in which there is an electrically conductive support (18) and at least one semiconductor light source (12) in contact with or near the support (18). ), the light module (2) also comprises at least one electrically conductive fixing means (24A, 24B) comprising a first part (28A, 28B) outside the housing (4) and a second part (30A, 30B). ) passing near or through the support (18), characterized in that the light module (2) comprises a protective element (38) against electrostatic discharges interposed between the second portion (30A, 30B) of the fixation and the support (18), and in that the protective element (38) extends along the second portion (30A, 30B) of the fastening means (24A, 24B) so as to prevent the passage of an electrostatic discharge between the fixing means (24A, 24B) and the e support (18).
2. Module lumineux (2) selon la revendication précédente, caractérisé en ce que l’élément protecteur (38) est formé à partir d’un matériau plastique de type acrylonitrile butadiène styrène (ABS), polycarbonate (PC) ou un mélange des deux. 2. Light module (2) according to the preceding claim, characterized in that the protective element (38) is formed from a plastic material of acrylonitrile butadiene styrene (ABS), polycarbonate (PC) or a mixture of both .
3. Module lumineux (2) selon l’une des revendications précédentes, caractérisé en ce que l’épaisseur de l’élément protecteur (38) est comprise entre 1 mm et 10 mm ou entre 2 mm et 8 mm, de préférence entre 2 mm et 3 mm. 3. Light module (2) according to one of the preceding claims, characterized in that the thickness of the protective element (38) is between 1 mm and 10 mm or between 2 mm and 8 mm, preferably between 2 mm and 3 mm.
4. Module lumineux (2) selon l’une des revendications précédentes, caractérisé en ce que l’élément protecteur (38) s’étend le long de la deuxième partie (30A, 30B) du moyen de fixation (24A, 24B), de sorte que le chemin (C) contournant l’élément protecteur (38) le plus court, entre le moyen de fixation (24A, 24B) et le support (18), est égal ou supérieure à 20 mm. 4. Light module (2) according to one of the preceding claims, characterized in that the protective element (38) extends along the second portion (30A, 30B) of the fastening means (24A, 24B), so that the path (C) bypassing the shortest protective element (38) between the fixing means (24A, 24B) and the support (18) is equal to or greater than 20 mm.
5. Module lumineux (2) selon l’une des revendications précédentes caractérisé en ce que l’élément protecteur (38) est une gaine entourant partiellement ou complètement la deuxième partie (30A, 30B) du moyen de fixation (24A, 24B). 5. Light module (2) according to one of the preceding claims characterized in that the protective member (38) is a sheath partially or completely surrounding the second portion (30A, 30B) of the fastening means (24A, 24B).
6. Module lumineux (2) selon la revendication précédente, caractérisé en ce que la longueur de la gaine varie autour du moyen de fixation (24A, 24B). 6. Light module (2) according to the preceding claim, characterized in that the length of the sheath varies around the fastening means (24A, 24B).
7. Module lumineux (2) selon la revendication précédente, caractérisé en ce qu’une paroi latérale (40B) de l’élément protecteur (38) est plus courte, lorsque ladite paroi latérale est en vis-à-vis d’un élément non conducteur. 7. Light module (2) according to the preceding claim, characterized in that a side wall (40B) of the protective element (38) is shorter, when said side wall is vis-à-vis an element non-conducting
8. Module lumineux (2) selon l’une des revendications précédentes, caractérisé en ce que l’élément protecteur (38) s’étend à partir d’une face interne (22) du boîtier (4). 8. Light module (2) according to one of the preceding claims, characterized in that the protective element (38) extends from an inner face (22) of the housing (4).
9. Module lumineux (2) selon la revendication précédente, caractérisé en ce que l’élément protecteur (38) est solidaire de la face interne (22) du boîtier (4). 9. Light module (2) according to the preceding claim, characterized in that the protective element (38) is integral with the inner face (22) of the housing (4).
10. Module lumineux (2) selon l’une des revendications précédentes, caractérisé en ce que le moyen de fixation (24A, 24B) est réversible. 10. Light module (2) according to one of the preceding claims, characterized in that the fixing means (24A, 24B) is reversible.
11. Module lumineux (2) selon la revendication précédente, caractérisé en ce que le moyen de fixation (24A, 24B) est une vis de fixation comprenant une tête (28A, 28B) affleurant l’extérieur du boîtier (4) et une tige filetée (30A, 30B) s’étendant à l’intérieur du boîtier (4). 11. Light module (2) according to the preceding claim, characterized in that the fixing means (24A, 24B) is a fixing screw comprising a head (28A, 28B) flush with the outside of the housing (4) and a rod threaded (30A, 30B) extending inside the housing (4).
12. Module lumineux (2) selon l’une des revendications précédentes, caractérisé en ce que le support est une carte électronique (14) comprenant des pistes conductrices (16) connectées à au moins une source de lumière (12) ou un réflecteur (18) optique comprenant une couche métallique. Light module (2) according to one of the preceding claims, characterized in that the support is an electronic card (14) comprising conductive tracks (16) connected to at least one light source (12) or a reflector ( 18) optical comprising a metal layer.
13. Module lumineux (2) selon l’une des revendications précédentes, caractérisé en ce que la source de lumière (12) à semi-conducteur est une diode électroluminescente. 13. Light module (2) according to one of the preceding claims, characterized in that the light source (12) semiconductor is a light emitting diode.
14. Dispositif de signalisation et/ou d’éclairage pour véhicule automobile comprenant un module lumineux (2) selon l’une des revendications précédentes. 14. A signaling and / or lighting device for a motor vehicle comprising a light module (2) according to one of the preceding claims.
15. Véhicule automobile comprenant un dispositif de signalisation et/ou d’éclairage selon la revendication précédente. 15. Motor vehicle comprising a signaling device and / or lighting according to the preceding claim.
PCT/FR2018/053105 2017-12-05 2018-12-04 Luminous module comprising a protective element for preventing the passage of electrostatic discharges between the exterior and interior of the luminous module WO2019110918A1 (en)

Priority Applications (1)

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EP18830911.6A EP3721137A1 (en) 2017-12-05 2018-12-04 Luminous module comprising a protective element for preventing the passage of electrostatic discharges between the exterior and interior of the luminous module

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FR1761649 2017-12-05
FR1761649A FR3074564B1 (en) 2017-12-05 2017-12-05 LUMINOUS MODULE COMPRISING A PROTECTIVE ELEMENT FOR PREVENTING ELECTROSTATIC DISCHARGE BETWEEN OUTSIDE AND INTERIOR OF THE LIGHT MODULE

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Citations (6)

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US20060108597A1 (en) * 2004-11-25 2006-05-25 Koito Manufacturing Co., Ltd. Light-emitting device and vehicle lamp
DE202007011255U1 (en) * 2007-08-10 2007-11-29 Hella Kgaa Hueck & Co. Lighting device for vehicles
EP3057389A1 (en) * 2015-02-13 2016-08-17 Valeo Vision Lighting device for vehicle with electrostatic discharge protection
DE102016213778A1 (en) * 2015-07-27 2017-02-02 Koito Manufacturing Co., Ltd. lamp
US9718393B2 (en) * 2014-02-12 2017-08-01 Koito Manufacturing Co., Ltd. Vehicle lamp with a conductive reflector and a grounding connection terminal

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020064053A1 (en) * 2000-10-17 2002-05-30 Koito Manufacturing Co., Ltd. Vehicle lamp
US20060108597A1 (en) * 2004-11-25 2006-05-25 Koito Manufacturing Co., Ltd. Light-emitting device and vehicle lamp
DE202007011255U1 (en) * 2007-08-10 2007-11-29 Hella Kgaa Hueck & Co. Lighting device for vehicles
US9718393B2 (en) * 2014-02-12 2017-08-01 Koito Manufacturing Co., Ltd. Vehicle lamp with a conductive reflector and a grounding connection terminal
EP3057389A1 (en) * 2015-02-13 2016-08-17 Valeo Vision Lighting device for vehicle with electrostatic discharge protection
DE102016213778A1 (en) * 2015-07-27 2017-02-02 Koito Manufacturing Co., Ltd. lamp

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FR3074564B1 (en) 2019-11-08
EP3721137A1 (en) 2020-10-14
FR3074564A1 (en) 2019-06-07

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