EP3543597B1 - Lighting module provided with a micro-mirror array with optimised cooling - Google Patents

Lighting module provided with a micro-mirror array with optimised cooling Download PDF

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Publication number
EP3543597B1
EP3543597B1 EP19164754.4A EP19164754A EP3543597B1 EP 3543597 B1 EP3543597 B1 EP 3543597B1 EP 19164754 A EP19164754 A EP 19164754A EP 3543597 B1 EP3543597 B1 EP 3543597B1
Authority
EP
European Patent Office
Prior art keywords
zone
lighting module
micro
heat sink
air outlet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP19164754.4A
Other languages
German (de)
French (fr)
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EP3543597A1 (en
Inventor
Maxime Rousseau
Thomas Daniel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Vision SAS
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Valeo Vision SAS
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Publication date
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Publication of EP3543597A1 publication Critical patent/EP3543597A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/67—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on reflectors
    • F21S41/675—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on reflectors by moving reflectors
    • 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
    • F21S41/141—Light emitting diodes [LED]
    • 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
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/40—Cooling of lighting devices
    • F21S45/42—Forced cooling
    • F21S45/43—Forced cooling using gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/40—Cooling of lighting devices
    • F21S45/47—Passive cooling, e.g. using fins, thermal conductive elements or openings
    • 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
    • F21V14/00—Controlling the distribution of the light emitted by adjustment of elements
    • F21V14/04—Controlling the distribution of the light emitted by adjustment of elements by movement of reflectors
    • 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
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/60—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air
    • F21V29/67—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air characterised by the arrangement of fans
    • 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
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/147—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
    • F21W2102/20—Illuminance distribution within the emitted light

Definitions

  • the at least one chimney can be oriented vertically and can be tilted towards the rear of the lighting module.
  • the first zone can be delimited from the second zone at least partially by a first electronic card supporting the at least one light source and/or by a base of the first heat sink.
  • the first zone can be delimited from the third zone at least partially by a second electronic card supporting the array of micro-mirrors and/or by a base of the second heat sink.
  • the lighting module may include projection optics capable of guiding light rays reflected by the matrix of micro-mirrors, the first zone and/or the second zone comprising an air outlet above the projection optics.
  • the lighting module comprises a first fan able to generate an air flow only in the first zone and in the third zone and a second fan able to generate an air flow only in the second zone.
  • the two fans can be arranged parallel one above the other.
  • the invention also relates to a headlamp comprising a lighting module as defined above.
  • the invention also relates to a motor vehicle comprising a lighting module as defined above or a headlamp as defined above.
  • the left and the right are defined according to the point of view of a driver of a vehicle.
  • the X axis designates the longitudinal axis of the vehicle. In forward gear and in a straight line, the vehicle progresses from the rear to the front in a direction parallel to its longitudinal axis.
  • the X axis is oriented from the front to the rear of the vehicle, that is to say in the direction of reverse gear.
  • the Y axis designates the transverse axis of the vehicle.
  • the Y axis is oriented from left to right.
  • the Z axis refers to the axis perpendicular to the X axis and the Y axis.
  • the Z axis is a vertical axis when the vehicle is resting on horizontal ground.
  • the Z axis is oriented from bottom to top.
  • the X, Y and Z axes form a direct orthonormal frame. In all of the figures and the description, it is considered that the vehicle rests on horizontal ground. On the other hand, for the sake of simplifying the description, this same mark, defined by reference to a vehicle, will also be used for a lighting module even considered outside a vehicle, since it is intended for mounting in a specific orientation on a vehicle.
  • the lighting module 3 comprises projection optics 21 facing forwards through which light rays can be emitted.
  • the housing 10 comprises a first front opening 11 positioned above the projection optics 21, intended for the exit of an air flow, substantially oriented parallel to the longitudinal axis.
  • This first front opening has a generally rectangular shape with the large side of the rectangle parallel to the transverse axis.
  • the housing 10 also comprises a second front opening 12 positioned below the projection optics 21, likewise intended for the exit of an air flow, in a substantially longitudinally oriented manner.
  • This second front opening 12 is particularly visible on the picture 3 : it is in fact made up of five windows positioned transversely next to each other.
  • the casing also comprises two upper openings 13 on the top of the casing 10, likewise intended for the exit of an air flow. The shape of these different openings could be different provided that they allow the passage of air between the inside and the outside of the casing 10, according to an operation which will be detailed subsequently.
  • a first zone Z1 comprises on the one hand a light-emitting diode 22 connected to a first electronic card 23, and on the other hand a matrix of micro-mirrors 24 connected to a second electronic card 25.
  • the two electronic cards 23, 25 can comprise pilots or electronic components making it possible to respectively control the switching on of the light-emitting diode 22 and the activation of the matrix of micro-mirrors 24.
  • the first zone Z1 also comprises the projection optics 21. It is therefore the seat of the production of light and its diffusion towards the exterior of the projector.
  • a second zone Z2 comprises a first heat sink 26 capable of dissipating the heat generated by the light-emitting diode.
  • a third zone Z3 comprises a second heat sink 27 capable of dissipating the heat generated by the matrix of micro-mirrors 12.
  • the second zone Z2 is arranged above the first zone Z1 and the third zone Z3 is arranged below the first zone Z1.
  • the first zone is therefore arranged vertically between the second zone Z2 and the third zone Z3.
  • the first zone Z1 comprises an air outlet 30 facing upwards, via an upper face of the lighting module, and coinciding with the upper openings 13 of the casing.
  • the second zone Z2 comprises an air outlet 34 facing the front of the lighting module and coinciding with the first front opening 11 of the casing.
  • the third zone Z3 comprises an air outlet 35 facing the front of the lighting module and coinciding with the second front opening 12 of the casing. As mentioned above, these zones are distinct, and their respective air outlets are distinct.
  • the light-emitting diode 22 is a light source 22'. Alternatively, it could be replaced by any other form of light source such as an incandescent bulb.
  • the lighting module could include any number of light emitting diodes or any other form of light source.
  • the lighting module 3 comprises a collimating lens 28 and an optical prism 29, both positioned in the first zone Z1.
  • the collimating lens 28 and the optical prism 29 are interposed between the light-emitting diode 22 and the matrix of micro-mirrors 24 so as to shape a light beam and to guide this light beam towards the matrix of micro-mirrors 24
  • the projection optic 21 is positioned downstream of the matrix of micro-mirrors 24 and is composed of several lenses in series.
  • the matrix of micro-mirrors 24 is an electromechanical microsystem comprising a multitude of flat micro-mirrors which are all independently movable around the same axis.
  • the micro-mirrors can take two distinct orientations. The orientation of each micro-mirror can be controlled individually by the effect of an electrostatic force.
  • the array of micro-mirrors has a shape rectangular and may comprise several hundred micro-mirrors over the width and several hundred micro-mirrors over the length. According to a first orientation, called active orientation, a micro-mirror reflects a light ray coming from the light-emitting diode towards the projection optics 21.
  • a micro-mirror reflects a light ray coming from the light-emitting diode elsewhere than towards the projection optics.
  • the micro-mirror array receives a command defining which micro-mirrors are oriented in the first orientation and which micro-mirrors are oriented in the second orientation.
  • each micro-mirror defines a pixel of an image: the matrix of micro-mirrors can thus be used not only to obtain standardized lighting but also to project complex images.
  • the micro-mirror array is integrated into a larger chip. This chip is integrated into the second electronic card 25. To guarantee correct operation, the temperature of the chip and of the matrix of micro-mirrors must not exceed a threshold temperature.
  • the first heat sink 26 and the second heat sink 27 are heat dissipation means by thermal conduction.
  • Each of the heat sinks is made, preferably in one and the same piece, from a material that conducts heat, for example aluminum or copper. It preferably comprises an exchange surface with the air that is as large as possible.
  • the first heat sink 26 is particularly visible on the figure 7 and 8 . It comprises a base 26A pressed against the first electronic card 23.
  • the base 26A has a generally rectangular shape and has a larger surface than that of the first electronic card 23.
  • the base 26A makes it possible, in addition to the first electronic card, to physically separate the first zone Z1 from the second zone Z2.
  • the first heat sink 26 also includes a set of pins 26B extending generally vertically upwards.
  • the pins 26B form a grid of rectangular outer shape, a first side of which extends parallel to the longitudinal axis X and a second side extends parallel to the transverse axis Y. This set of pins 26B is framed on the right and left by two blanks 26C extending longitudinally and vertically.
  • the second heat sink 27 is in contact with the second electronic card 25. It comprises a base 27A extending parallel to the second electronic card 25. It also comprises a body 27D, of generally parallelepipedic shape and extending upwards from an upper face of base 27A. This body is pressed against the chip integrating the array of micro-mirrors 24 so as to conduct the heat produced by the array of micro-mirrors 24 into the assembly of the second heat sink 27.
  • the second heat sink 27 also comprises a set of pins 27B extend generally vertically downward from base 27A.
  • the pins 27B form a grid of rectangular outer shape, a first side of which extends parallel to the longitudinal axis X and a second side extends parallel to the transverse axis Y. This set of pins 27B is framed to the right and to left by two blanks 27C extending longitudinally and vertically.
  • pins 26B, 27B can be arbitrary.
  • the pins could be replaced by fins, oriented parallel to the flow of air intended to cross the heat sink, that is to say parallel to the longitudinal axis X.
  • Two chimneys 30A, 30B are arranged on either side of the first heat sink 26. These two chimneys make it possible to place the first zone Z1 in communication with the outside of the lighting module. The two chimneys therefore constitute the air outlets 30 of the first zone Z1. The two chimneys pass through the second zone Z2 on either side of the first heat sink 26. They extend vertically and are substantially inclined towards the rear of the lighting module. In other words, the axis of the chimneys 30A, 30B forms a non-zero angle with the vertical axis.
  • the two chimneys emerge on the one hand in the first zone at the level of a high point of the first zone Z1, that is to say at the level of the plane of separation between the first zone and the second zone on the side of the large base of the trapezoid forming a cross section of the first zone Z1.
  • the two chimneys 30A, 30B emerge opposite the two upper openings 13 of the box 10.
  • the chimneys have an ellipsoidal section but, as a variant, could have a section of any other shape. As a variant, the number of these chimneys could also be different.
  • the lighting module could include only one chimney or even more than two chimneys.
  • the two chimneys and the first heat sink form one and the same part.
  • the lighting module 3 also comprises two fans 31, 32 arranged at the rear of the lighting module, and able to generate an air flow in each of the three zones Z1, Z2 and Z3. More particularly, a first fan 31 is arranged so as to generate an air flow only in the first zone Z1 and in the third zone Z3 and a second fan 32 is arranged so as to generate an air flow only in the second Z2 area.
  • the two fans 31, 32 are arranged vertically one above the other.
  • the two fans can be identical or at least have a substantially identical external shape.
  • each fan includes at least one rotary blade 31A, 32A, and an electric motor able to drive the blade in rotation.
  • the lighting module includes an air inlet 33 at the rear of each fan through which fresh air can be sucked into the lighting module.
  • each fan could be replaced by any other means of generating an air flow 31', 32'.
  • the two fans could be replaced by a single more powerful fan.
  • each of the zones Z1, Z2 and Z3 When the fans are operating, the air flow in each of the zones Z1, Z2 and Z3 is oriented substantially longitudinally from the rear to the front.
  • the air flows passing through the three zones Z1, Z2, Z3 are independent. They don't mix.
  • the three zones Z1, Z2, Z3 do not necessarily have to be perfectly airtight with respect to each other and air leaks between the zones may exist as long as they remain minimal with respect to the airflow passing through each of the zones.
  • the airflow in the first zone Z1 is generated by the first fan and is guided between the first electronic card and the second electronic card. It cools the light-emitting diode 22 and the matrix of micro-mirrors 24 by convection then escapes upwards through the two chimneys 30A, 30B communicating with the two upper openings 13 of the case.
  • the first fan is not running, hot air lighter than cold air will tend to come out of the first zone. through the two chimneys since these extend from the highest part of the first zone Z1.
  • the architecture of the first zone Z1 is favorable to a natural minimum cooling of the first zone Z1. This phenomenon is added to the contribution of the first fan 31, so as to make the cooling optimal.
  • the air flow in the second zone Z2, represented on the figure 4 and 7 by a second arrow F2 passes through the first heat sink and exits from the projector through the first front opening 11 of the housing 10.
  • the fresh air sucked in by the second fan passes through the first heat sink by sliding around the pins 26B.
  • the airflow in the second zone is channeled laterally between the two blanks 26C, the base 26A and an upper side of the casing 10.
  • a heat exchange occurs between the cool air and the hotter heat sink. This heat exchange contributes to lowering the temperature of the first heat sink 26 and therefore of the first electronic card 23, as well as of the light-emitting diode 22.
  • a first part of the air flow in the third zone Z3 circulates between the second electronic card 25 and the base 27A of the second heat sink 27.
  • a second part of the air flow in the third zone Z3 crosses the second heat sink 27 by slipping around its pins 27B. This second part is channeled between the two side blanks 27C, the base 27A and one side bottom of the housing 10.
  • a thermal exchange occurs between the cool air and the hotter heat sink. This heat exchange contributes to lowering the temperature of the second heat sink 27 and therefore of the second electronic card 25 and of the matrix of micro-mirrors 24.
  • the flow of air emerges from the third zone Z3 by passing through the second opening front 12 of the case.
  • the light-emitting diode When the light-emitting diode emits a light ray, the latter first passes through the collimating lens 28 then the optical prism 29 before reaching the matrix of micro-mirrors 24. If the light ray reaches a micro-mirror in active orientation, it is reflected towards the optical prism 29 from where it will be deflected towards the projection optics 21. It then passes through the various lenses forming the projection optics, and thus emerges from the projector forwards to illuminate the road or the surroundings of the vehicle. Such a path is represented by a dotted line R1 on the figure 4 .
  • the light ray reaches a micro-mirror in inactive orientation, the latter is deflected out of the projection optics 21 and does not contribute to the lighting of the road or the environment of the vehicle. If a stray light ray leaves the lighting module through one of the chimneys 30A, 30B, for example by following the path represented by the line R2 on the figure 4 , it also does not participate in the lighting of the road or the environment of the vehicle because the chimney is tilted towards the rear. Thus, the rearward inclination of the chimneys avoids making visible the light rays which would emerge parasitically from the lighting module via the chimneys 30A, 30B.
  • the air outlet 30 of the first zone Z1 which can be in the form of one or more chimneys 30A, 30B, could not lead upwards but on the right and/or left sides. , or towards the bottom, or even at the rear of the lighting module 3.
  • the air outlet is advantageously substantially inclined towards the rear to prevent stray light rays from being made visible at the front of the vehicle through the air outlet.
  • a lighting module is obtained in which a flow of air is made to circulate not only around the heat sinks but also around the light source 22' and the matrix of micro-mirrors.
  • the air flows are independent, which makes it possible to obtain particularly efficient cooling.
  • the temperature of the light source can be lowered by about 10°C and the temperature of the micro-mirror array can be lowered by about 5°C, which improves the service life and the reliability of these components.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Projection Apparatus (AREA)

Description

Domaine technique de l'inventionTechnical field of the invention

La présente invention concerne un module d'éclairage pour un projecteur d'un véhicule automobile, le module d'éclairage comprenant une matrice de micro-miroirs. L'invention concerne également un projecteur pour véhicule automobile comprenant un tel module d'éclairage. L'invention concerne également un véhicule automobile comprenant un tel projecteur ou un tel module d'éclairage.The present invention relates to a lighting module for a headlamp of a motor vehicle, the lighting module comprising a matrix of micro-mirrors. The invention also relates to a headlamp for a motor vehicle comprising such a lighting module. The invention also relates to a motor vehicle comprising such a headlamp or such a lighting module.

État de la techniqueState of the art

Pour l'éclairage des véhicules automobiles, on connaît l'utilisation de modules d'éclairage comprenant une source lumineuse et une matrice de micro-miroirs. Une matrice de micro-miroirs est un microsystème électromécanique comprenant une multitude de micro-miroirs qui sont tous mobiles autour d'un même axe et qui peuvent prendre au moins deux orientations distinctes. Selon sa première orientation, un micro-miroir transmet un rayon lumineux hors du module d'éclairage, dans un champ d'éclairage. Selon sa deuxième orientation, le rayon lumineux est dévié hors du champ d'éclairage et est absorbé par une structure du module d'éclairage. L'orientation de chaque micro-miroir peut être commandée individuellement par l'effet d'une force électrostatique. Le module d'éclairage comprend un circuit de commande relié à une unité de commande électronique. L'unité de commande électronique émet un courant de commande à destination de chacun des micro-miroirs pour définir leur orientation.For the lighting of motor vehicles, the use of lighting modules comprising a light source and a matrix of micro-mirrors is known. A matrix of micro-mirrors is an electromechanical microsystem comprising a multitude of micro-mirrors which are all mobile around the same axis and which can take at least two distinct orientations. According to its first orientation, a micro-mirror transmits a light ray out of the lighting module, into a lighting field. According to its second orientation, the light ray is deflected outside the lighting field and is absorbed by a structure of the lighting module. The orientation of each micro-mirror can be controlled individually by the effect of an electrostatic force. The lighting module includes a control circuit connected to an electronic control unit. The electronic control unit sends a control current to each of the micro-mirrors to define their orientation.

De tels projecteurs permettent de composer et de projeter des images complexes devant le véhicule. Ils sont donc utilisés pour réaliser différentes fonctions telles que par exemple la projection d'informations utiles à la sécurité de piétons situés aux abords directs du véhicule, ou encore par exemple une fonction d'éclairage de la route évitant l'éblouissement des autres automobilistes. WO 2017/132713 A1 et US 2017/160542 A1 divulguent des modules d'éclairage connus de l'art antérieur.Such projectors make it possible to compose and project complex images in front of the vehicle. They are therefore used to make various functions such as for example the projection of information useful for the safety of pedestrians located in the direct vicinity of the vehicle, or even for example a road lighting function avoiding the dazzling of other motorists. WO 2017/132713 A1 and US 2017/160542 A1 disclose lighting modules known from the prior art.

Lors de son fonctionnement, un tel module d'éclairage peut s'échauffer fortement. Un échauffement excessif peut conduire à un disfonctionnement, voire à la destruction, de la matrice de micro-miroirs ou de son circuit de commande. Afin de refroidir la matrice de micro-miroirs, on connaît l'utilisation de dissipateurs thermiques associés à des ventilateurs. Toutefois, ces moyens de refroidissement ne sont pas suffisamment performants pour maintenir le module d'éclairage en dessous d'une température d'endommagement.During its operation, such a lighting module can heat up considerably. Excessive heating can lead to malfunction, or even destruction, of the micro-mirror array or its control circuit. In order to cool the matrix of micro-mirrors, the use of heat sinks associated with fans is known. However, these cooling means are not efficient enough to keep the lighting module below a damage temperature.

Objet de l'inventionObject of the invention

Le but de l'invention est de fournir un module d'éclairage remédiant aux inconvénients ci-dessus et améliorant les modules d'éclairage connus de l'art antérieur. En particulier, l'invention permet de réaliser un module d'éclairage qui soit compact, simple à mettre en œuvre et qui limite réchauffement de la source lumineuse, de la matrice de micro-miroirs et de leurs circuits de commande respectifs.The object of the invention is to provide a lighting module remedying the above drawbacks and improving the lighting modules known from the prior art. In particular, the invention makes it possible to produce a lighting module which is compact, simple to implement and which limits heating of the light source, of the matrix of micro-mirrors and of their respective control circuits.

L'invention se rapporte à un module d'éclairage pour un projecteur d'un véhicule automobile comprenant :

  • une première zone comprenant au moins une source lumineuse et une matrice de micro-miroirs,
  • une deuxième zone comprenant un premier dissipateur thermique apte à dissiper la chaleur générée par l'au moins une source lumineuse,
  • une troisième zone comprenant un deuxième dissipateur thermique apte à dissiper la chaleur générée par la matrice de micro-miroirs,
  • au moins un moyen de génération d'un flux d'air pour générer un flux d'air dans la première zone, dans la deuxième zone et dans la troisième zone,
la première zone, la deuxième zone et la troisième zone étant distinctes les unes des autres, la première zone étant agencée verticalement entre la deuxième zone et la troisième zone, la première zone comprenant une sortie d'air.The invention relates to a lighting module for a headlight of a motor vehicle comprising:
  • a first zone comprising at least one light source and a matrix of micro-mirrors,
  • a second zone comprising a first heat sink capable of dissipating the heat generated by the at least one light source,
  • a third zone comprising a second heat sink able to dissipate the heat generated by the matrix of micro-mirrors,
  • at least one means for generating an air flow for generating an air flow in the first zone, in the second zone and in the third zone,
the first zone, the second zone and the third zone being distinct from one another, the first zone being arranged vertically between the second zone and the third zone, the first zone comprising an air outlet.

La sortie d'air de la première zone peut être orientée vers le haut par une face supérieure du module d'éclairage. En variante, cette sortie d'air peut être orientée vers le bas, ou sur les cotés, ou à l'arrière du module d'éclairage.The air outlet of the first zone can be directed upwards by an upper face of the lighting module. As a variant, this air outlet can be oriented downwards, or on the sides, or at the rear of the lighting module.

La sortie d'air peut comprendre au moins une cheminée traversant la deuxième zone, notamment deux cheminées traversant la deuxième zone de part et d'autre du premier dissipateur thermique.The air outlet may comprise at least one chimney passing through the second zone, in particular two chimneys passing through the second zone on either side of the first heat sink.

L'au moins une cheminée peut être orientée verticalement et peut être inclinée vers l'arrière du module d'éclairage.The at least one chimney can be oriented vertically and can be tilted towards the rear of the lighting module.

La deuxième zone peut être agencée au dessus de la première zone. La troisième zone peut être agencée en dessous de la première zone.The second zone can be arranged above the first zone. The third zone can be arranged below the first zone.

La première zone peut être délimitée de la deuxième zone au moins partiellement par une première carte électronique supportant l'au moins une source lumineuse et/ou par une base du premier dissipateur thermique. La première zone peut être délimitée de la troisième zone au moins partiellement par une deuxième carte électronique supportant la matrice de micro-miroirs et/ou par une base du deuxième dissipateur thermique.The first zone can be delimited from the second zone at least partially by a first electronic card supporting the at least one light source and/or by a base of the first heat sink. The first zone can be delimited from the third zone at least partially by a second electronic card supporting the array of micro-mirrors and/or by a base of the second heat sink.

Le module d'éclairage peut comprendre une optique de projection apte à guider des rayons lumineux réfléchis par la matrice de micro-miroirs, la première zone et/ou la deuxième zone comprenant une sortie d'air au dessus de l'optique de projection.The lighting module may include projection optics capable of guiding light rays reflected by the matrix of micro-mirrors, the first zone and/or the second zone comprising an air outlet above the projection optics.

La deuxième zone et/ou la troisième zone peut comprendre une sortie d'air vers l'avant.The second zone and/or the third zone can comprise a forward air outlet.

La première zone et/ou la deuxième zone et/ou la troisième zone peut comprendre une entrée d'air depuis l'arrière.The first zone and/or the second zone and/or the third zone can comprise an air inlet from the rear.

Le module d'éclairage comprend un premier ventilateur apte à générer un flux d'air uniquement dans la première zone et dans la troisième zone et un deuxième ventilateur apte à générer un flux d'air uniquement dans la deuxième zone.The lighting module comprises a first fan able to generate an air flow only in the first zone and in the third zone and a second fan able to generate an air flow only in the second zone.

Les deux ventilateurs peuvent être agencés parallèlement l'un au dessus de l'autre.The two fans can be arranged parallel one above the other.

L'au moins une source lumineuse peut comprendre au moins une diode électroluminescente.The at least one light source may include at least one light emitting diode.

L'invention se rapporte également à un projecteur comprenant un module d'éclairage tel que défini précédemment.The invention also relates to a headlamp comprising a lighting module as defined above.

L'invention se rapporte également à un véhicule automobile comprenant un module d'éclairage tel que défini précédemment ou un projecteur tel que défini précédemment.The invention also relates to a motor vehicle comprising a lighting module as defined above or a headlamp as defined above.

Description sommaire des dessinsBrief description of the drawings

Ces objets, caractéristiques et avantages de la présente invention seront exposés en détail dans la description suivante d'un mode de réalisation particulier fait à titre non-limitatif, en relation avec les figures jointes parmi lesquelles :

  • la figure 1 est une vue schématique d'un véhicule automobile selon un mode de réalisation de l'invention ;
  • la figure 2 est une vue isométrique de dessus d'un module d'éclairage selon un mode de réalisation de l'invention ;
  • la figure 3 est une vue isométrique de face du module d'éclairage selon le mode de réalisation de l'invention ;
  • la figure 4 est une vue schématique en coupe du profil du module d'éclairage selon le mode de réalisation de l'invention ;
  • la figure 5 est une vue isométrique en coupe du module d'éclairage selon le mode de réalisation de l'invention ;
  • la figure 6 est une vue isométrique de l'arrière du module d'éclairage selon le mode de réalisation de l'invention ;
  • la figure 7 est une vue isométrique du module d'éclairage sans son boîtier de protection selon le mode de réalisation de l'invention ;
  • la figure 8 est une vue isométrique de dessus d'un premier dissipateur thermique selon le mode de réalisation de l'invention ;
  • la figure 9 est une vue isométrique de dessous d'un deuxième dissipateur thermique selon le mode de réalisation de l'invention.
These objects, characteristics and advantages of the present invention will be explained in detail in the following description of a particular embodiment given on a non-limiting basis, in relation to the appended figures, among which:
  • the figure 1 is a schematic view of a motor vehicle according to one embodiment of the invention;
  • the figure 2 is an isometric top view of a lighting module according to one embodiment of the invention;
  • the picture 3 is a front isometric view of the lighting module according to the embodiment of the invention;
  • the figure 4 is a schematic sectional view of the profile of the lighting module according to the embodiment of the invention;
  • the figure 5 is an isometric sectional view of the lighting module according to the embodiment of the invention;
  • the figure 6 is an isometric view of the rear of the lighting module according to the embodiment of the invention;
  • the figure 7 is an isometric view of the lighting module without its protective casing according to the embodiment of the invention;
  • the figure 8 is a top isometric view of a first heat sink according to the embodiment of the invention;
  • the figure 9 is an isometric bottom view of a second heat sink according to the embodiment of the invention.

Description d'un mode préférentiel de l'inventionDescription of a preferred mode of the invention

Sur l'ensemble des figures et de la description, la gauche et la droite sont définies selon le point de vue d'un conducteur d'un véhicule. L'axe X désigne l'axe longitudinal du véhicule. En marche avant et en ligne droite, le véhicule progresse de l'arrière vers l'avant selon une direction parallèle à son axe longitudinal. L'axe X est orienté de l'avant vers l'arrière du véhicule, c'est-à-dire dans le sens de la marche arrière. L'axe Y désigne l'axe transversal du véhicule. L'axe Y est orienté de la gauche vers la droite. L'axe Z désigne l'axe perpendiculaire à l'axe X et à l'axe Y. L'axe Z est un axe vertical lorsque le véhicule repose sur un sol horizontal. L'axe Z est orienté de bas en haut. Les axes X, Y et Z forment un repère orthonormé direct. Sur l'ensemble des figures et de la description, on considère que le véhicule repose sur un sol horizontal. D'autre part, dans un souci de simplification de la description, ce même repère, défini par référence à un véhicule, sera aussi utilisé pour un module d'éclairage même considéré hors d'un véhicule, puisqu'il est destiné à un montage selon une orientation spécifique sur un véhicule.In all the figures and in the description, the left and the right are defined according to the point of view of a driver of a vehicle. The X axis designates the longitudinal axis of the vehicle. In forward gear and in a straight line, the vehicle progresses from the rear to the front in a direction parallel to its longitudinal axis. The X axis is oriented from the front to the rear of the vehicle, that is to say in the direction of reverse gear. The Y axis designates the transverse axis of the vehicle. The Y axis is oriented from left to right. The Z axis refers to the axis perpendicular to the X axis and the Y axis. The Z axis is a vertical axis when the vehicle is resting on horizontal ground. The Z axis is oriented from bottom to top. The X, Y and Z axes form a direct orthonormal frame. In all of the figures and the description, it is considered that the vehicle rests on horizontal ground. On the other hand, for the sake of simplifying the description, this same mark, defined by reference to a vehicle, will also be used for a lighting module even considered outside a vehicle, since it is intended for mounting in a specific orientation on a vehicle.

La figure 1 illustre un véhicule 1 automobile muni d'un projecteur 2 selon un mode de réalisation de l'invention. Le véhicule peut être de toute nature, par exemple il peut s'agir d'un véhicule particulier, d'un véhicule utilitaire ou d'un camion. Le projecteur 2 est disposé à l'avant du véhicule mais pourrait aussi bien équiper l'arrière du véhicule. Le projecteur permet d'éclairer la route, d'être vu des autres automobilistes et/ou de projeter sur le sol des images fournissant des informations au conducteur ou à son environnement. Le projecteur 2 comprend un module d'éclairage 3 selon un mode de réalisation de l'invention.The figure 1 illustrates a motor vehicle 1 fitted with a headlight 2 according to one embodiment of the invention. The vehicle can be of any kind, for example it can be a private vehicle, a commercial vehicle or a truck. The projector 2 is arranged at the front of the vehicle but could also equip the rear of the vehicle. The projector makes it possible to illuminate the road, to be seen by other motorists and/or to project images onto the ground providing information to the driver or to his environment. The projector 2 comprises a lighting module 3 according to one embodiment of the invention.

Les figures 2 et 3 illustrent le module d'éclairage 3. Le module d'éclairage 3 comprend un boîtier 10 formant une enveloppe de protection de forme globalement parallélépipédique. Le module d'éclairage 3 comprend également différents connecteurs électriques 4 permettant de le relier électriquement à une unité de commande électronique embarquée dans le véhicule. Ces connecteurs peuvent être en nombre quelconque et avoir une forme quelconque.The figure 2 and 3 illustrate the lighting module 3. The lighting module 3 comprises a casing 10 forming a generally parallelepiped-shaped protective envelope. The lighting module 3 also includes various electrical connectors 4 enabling it to be electrically connected to an electronic control unit on board the vehicle. These connectors can be any number and have any shape.

Le module d'éclairage 3 comprend une optique de projection 21 orientée vers l'avant par laquelle des rayons lumineux peuvent être émis. Le boîtier 10 comprend une première ouverture frontale 11 positionnée au dessus de l'optique de projection 21, destinée à la sortie d'un flux d'air, de manière sensiblement orientée parallèlement à l'axe longitudinal. Cette première ouverture frontale a une forme globalement rectangulaire avec le grand coté du rectangle parallèle à l'axe transversal. Le boîtier 10 comprend également une deuxième ouverture frontale 12 positionnée en dessous de l'optique de projection 21, de même destinée à la sortie d'un flux d'air, de manière sensiblement orientée longitudinalement. Cette deuxième ouverture frontale 12 est particulièrement visible sur la figure 3 : elle est en fait constituée de cinq fenêtres positionnées transversalement les unes à côté des autres. Enfin le boîtier comprend également deux ouvertures supérieures 13 sur le dessus du boîtier 10, de même destinées à la sortie d'un flux d'air. La forme de ces différentes ouvertures pourrait être différente pourvu qu'elles permettent le passage de l'air entre l'intérieur et l'extérieur du boîtier 10, selon un fonctionnement qui sera détaillé par la suite.The lighting module 3 comprises projection optics 21 facing forwards through which light rays can be emitted. The housing 10 comprises a first front opening 11 positioned above the projection optics 21, intended for the exit of an air flow, substantially oriented parallel to the longitudinal axis. This first front opening has a generally rectangular shape with the large side of the rectangle parallel to the transverse axis. The housing 10 also comprises a second front opening 12 positioned below the projection optics 21, likewise intended for the exit of an air flow, in a substantially longitudinally oriented manner. This second front opening 12 is particularly visible on the picture 3 : it is in fact made up of five windows positioned transversely next to each other. Finally, the casing also comprises two upper openings 13 on the top of the casing 10, likewise intended for the exit of an air flow. The shape of these different openings could be different provided that they allow the passage of air between the inside and the outside of the casing 10, according to an operation which will be detailed subsequently.

En référence aux figures 4 et 5, le module d'éclairage 3 comprend trois zones Z1, Z2, Z3 distinctes les unes des autres. Ces trois zones correspondent à des volumes complémentaires du module d'éclairage.With reference to figure 4 and 5 , the lighting module 3 comprises three zones Z1, Z2, Z3 distinct from each other. These three zones correspond to complementary volumes of the lighting module.

Une première zone Z1 comprend d'une part une diode électroluminescente 22 connectée à une première carte électronique 23, et d'autre part une matrice de micro-miroirs 24 connectée à une deuxième carte électronique 25. Les deux cartes électroniques 23, 25 peuvent comprendre des pilotes ou des composants électroniques permettant de commander respectivement l'allumage de la diode électroluminescente 22 et l'activation de la matrice de micro-miroirs 24. La première zone Z1 comprend également l'optique de projection 21. Elle est donc le siège de la production de lumière et de sa diffusion vers l'extérieur du projecteur. Une deuxième zone Z2 comprend un premier dissipateur thermique 26 apte à dissiper la chaleur générée par la diode électroluminescente. Une troisième zone Z3 comprend un deuxième dissipateur thermique 27 apte à dissiper la chaleur générée par la matrice de micro-miroirs 12. En référence à l'axe vertical, la deuxième zone Z2 est agencée au dessus de la première zone Z1 et la troisième zone Z3 est agencée en dessous de la première zone Z1. La première zone est donc agencée verticalement entre la deuxième zone Z2 et la troisième zone Z3.A first zone Z1 comprises on the one hand a light-emitting diode 22 connected to a first electronic card 23, and on the other hand a matrix of micro-mirrors 24 connected to a second electronic card 25. The two electronic cards 23, 25 can comprise pilots or electronic components making it possible to respectively control the switching on of the light-emitting diode 22 and the activation of the matrix of micro-mirrors 24. The first zone Z1 also comprises the projection optics 21. It is therefore the seat of the production of light and its diffusion towards the exterior of the projector. A second zone Z2 comprises a first heat sink 26 capable of dissipating the heat generated by the light-emitting diode. A third zone Z3 comprises a second heat sink 27 capable of dissipating the heat generated by the matrix of micro-mirrors 12. With reference to the vertical axis, the second zone Z2 is arranged above the first zone Z1 and the third zone Z3 is arranged below the first zone Z1. The first zone is therefore arranged vertically between the second zone Z2 and the third zone Z3.

La première zone Z1 comprend une sortie d'air 30 orientée vers le haut, par une face supérieure du module d'éclairage, et coïncidant avec les ouvertures supérieures 13 du boîtier. La deuxième zone Z2 comprend une sortie d'air 34 orientée vers l'avant du module d'éclairage et coïncidant avec la première ouverture frontale 11 du boîtier. La troisième zone Z3 comprend une sortie d'air 35 orientée vers l'avant du module d'éclairage et coïncidant avec la deuxième ouverture frontale 12 du boîtier. Comme mentionné ci-dessus, ces zones sont distinctes, et leurs sorties d'air respectives sont distinctes.The first zone Z1 comprises an air outlet 30 facing upwards, via an upper face of the lighting module, and coinciding with the upper openings 13 of the casing. The second zone Z2 comprises an air outlet 34 facing the front of the lighting module and coinciding with the first front opening 11 of the casing. The third zone Z3 comprises an air outlet 35 facing the front of the lighting module and coinciding with the second front opening 12 of the casing. As mentioned above, these zones are distinct, and their respective air outlets are distinct.

La première zone Z1 est délimitée de la deuxième zone Z2 selon un premier plan dans lequel s'étend la première carte électronique 23. Ce premier plan est incliné vers l'avant et vers le haut par rapport à un plan horizontal, comme cela apparait sur les figures 4 et 5. La première zone Z1 est délimitée de la troisième zone Z3 selon un deuxième plan dans lequel s'étend la deuxième carte électronique 25. Ce deuxième plan est sensiblement horizontal. Ainsi la première zone Z1 comprend une section transversale de forme globalement trapézoïdale. La petite base du trapèze est du côté arrière du module d'éclairage et la grande base du trapèze est du coté avant.The first zone Z1 is delimited from the second zone Z2 according to a first plane in which extends the first electronic card 23. This foreground is tilted forward and upward relative to a horizontal plane, as seen in the figure 4 and 5 . The first zone Z1 is delimited from the third zone Z3 along a second plane in which the second electronic card 25 extends. This second plane is substantially horizontal. Thus the first zone Z1 comprises a cross section of generally trapezoidal shape. The small trapezium base is on the back side of the light module and the large trapezoid base is on the front side.

La diode électroluminescente 22 est une source lumineuse 22'. En variante, elle pourrait être remplacée par toute autre forme de source lumineuse comme par exemple une ampoule à incandescence. Le module d'éclairage pourrait comprendre un nombre quelconque de diodes électroluminescentes ou de toutes autres formes de source lumineuse.The light-emitting diode 22 is a light source 22'. Alternatively, it could be replaced by any other form of light source such as an incandescent bulb. The lighting module could include any number of light emitting diodes or any other form of light source.

Le module d'éclairage 3 comprend une lentille de collimation 28 et un prisme d'optique 29, tous deux positionnés dans la première zone Z1. La lentille de collimation 28 et le prisme d'optique 29 sont interposés entre la diode électroluminescente 22 et la matrice de micro-miroirs 24 de manière à mettre en forme un faisceau lumineux et à guider ce faisceau lumineux vers la matrice de micro-miroirs 24. L'optique de projection 21 est positionnée en aval de la matrice de micro-miroirs 24 et est composée de plusieurs lentilles en séries.The lighting module 3 comprises a collimating lens 28 and an optical prism 29, both positioned in the first zone Z1. The collimating lens 28 and the optical prism 29 are interposed between the light-emitting diode 22 and the matrix of micro-mirrors 24 so as to shape a light beam and to guide this light beam towards the matrix of micro-mirrors 24 The projection optic 21 is positioned downstream of the matrix of micro-mirrors 24 and is composed of several lenses in series.

La matrice de micro-miroirs 24 est un microsystème électromécanique comprenant une multitude de micro-miroirs plats qui sont tous mobiles indépendamment autour d'un même axe. Les micro-miroirs peuvent prendre deux orientations distinctes. L'orientation de chaque micro-miroir peut être commandée individuellement par l'effet d'une force électrostatique. La matrice de micro-miroirs présente une forme rectangulaire et peut comprendre plusieurs centaines de micro-miroirs sur la largeur et plusieurs centaines de micro-miroirs sur la longueur. Selon une première orientation, dite orientation active, un micro-miroir réfléchit un rayon lumineux provenant de la diode électroluminescente vers l'optique de projection 21. Selon une deuxième orientation, dite orientation inactive, un micro-miroir réfléchit un rayon lumineux provenant de la diode électroluminescente ailleurs que vers l'optique de projection. La matrice de micro-miroirs reçoit une commande définissant quels micro-miroirs sont orientés selon la première orientation et quels micro-miroirs sont orientés selon la deuxième orientation. Ainsi, chaque micro-miroir définit un pixel d'une image : la matrice de micro-miroirs peut ainsi être non seulement utilisée pour obtenir un éclairage standardisé mais aussi pour projeter des images complexes. La matrice de micro-miroirs est intégrée à une puce de plus grande dimension. Cette puce est intégrée à la deuxième carte électronique 25. Pour garantir un fonctionnement correct, la température de la puce et de la matrice de micro-miroirs ne doit pas excéder une température seuil.The matrix of micro-mirrors 24 is an electromechanical microsystem comprising a multitude of flat micro-mirrors which are all independently movable around the same axis. The micro-mirrors can take two distinct orientations. The orientation of each micro-mirror can be controlled individually by the effect of an electrostatic force. The array of micro-mirrors has a shape rectangular and may comprise several hundred micro-mirrors over the width and several hundred micro-mirrors over the length. According to a first orientation, called active orientation, a micro-mirror reflects a light ray coming from the light-emitting diode towards the projection optics 21. According to a second orientation, called inactive orientation, a micro-mirror reflects a light ray coming from the light-emitting diode elsewhere than towards the projection optics. The micro-mirror array receives a command defining which micro-mirrors are oriented in the first orientation and which micro-mirrors are oriented in the second orientation. Thus, each micro-mirror defines a pixel of an image: the matrix of micro-mirrors can thus be used not only to obtain standardized lighting but also to project complex images. The micro-mirror array is integrated into a larger chip. This chip is integrated into the second electronic card 25. To guarantee correct operation, the temperature of the chip and of the matrix of micro-mirrors must not exceed a threshold temperature.

Le premier dissipateur thermique 26 et le deuxième dissipateur thermique 27, sont des moyens de dissipation de la chaleur par conduction thermique. Chacun des dissipateurs thermiques est fabriqué, de préférence d'une seule et même pièce, dans un matériau conduisant la chaleur, par exemple en aluminium ou en cuivre. Il comprend de préférence une surface d'échange avec l'air aussi grande que possible.The first heat sink 26 and the second heat sink 27 are heat dissipation means by thermal conduction. Each of the heat sinks is made, preferably in one and the same piece, from a material that conducts heat, for example aluminum or copper. It preferably comprises an exchange surface with the air that is as large as possible.

Le premier dissipateur thermique 26 est particulièrement visible sur les figures 7 et 8. Il comprend une base 26A plaquée contre la première carte électronique 23. La base 26A a une forme globalement rectangulaire et a une surface plus grande que celle de la première carte électronique 23. La base 26A permet, en complément de la première carte électronique, de séparer physiquement la première zone Z1 de la deuxième zone Z2. Le premier dissipateur thermique 26 comprend également un ensemble de picots 26B s'étendent globalement verticalement vers le haut. Les picots 26B forment un quadrillage de forme extérieure rectangulaire dont un premier coté s'étend parallèlement à l'axe longitudinal X et un deuxième coté s'étend parallèlement à l'axe transversal Y. Cet ensemble de picots 26B est encadré à droite et à gauche par deux flans 26C s'étendant longitudinalement et verticalement.The first heat sink 26 is particularly visible on the figure 7 and 8 . It comprises a base 26A pressed against the first electronic card 23. The base 26A has a generally rectangular shape and has a larger surface than that of the first electronic card 23. The base 26A makes it possible, in addition to the first electronic card, to physically separate the first zone Z1 from the second zone Z2. The first heat sink 26 also includes a set of pins 26B extending generally vertically upwards. The pins 26B form a grid of rectangular outer shape, a first side of which extends parallel to the longitudinal axis X and a second side extends parallel to the transverse axis Y. This set of pins 26B is framed on the right and left by two blanks 26C extending longitudinally and vertically.

Le deuxième dissipateur thermique 27, particulièrement visible sur la figure 9, est en contact avec la deuxième carte électronique 25. Il comprend une base 27A s'étendant parallèlement à la deuxième carte électronique 25. Il comprend également un corps 27D, de forme globalement parallélépipédique et s'étendant vers le haut depuis une face supérieure de la base 27A. Ce corps est plaqué contre la puce intégrant la matrice de micro-miroirs 24 de sorte à conduire la chaleur produite par la matrice de micro-miroirs 24 dans l'ensemble du deuxième dissipateur thermique 27. Le deuxième dissipateur thermique 27 comprend également un ensemble de picots 27B s'étendent globalement verticalement vers le bas depuis la base 27A. Les picots 27B forment un quadrillage de forme extérieure rectangulaire dont un premier coté s'étend parallèlement à l'axe longitudinal X et un deuxième coté s'étend parallèlement à l'axe transversal Y. Cet ensemble de picots 27B est encadré à droite et à gauche par deux flans 27C s'étendant longitudinalement et verticalement.The second heat sink 27, particularly visible on the figure 9 , is in contact with the second electronic card 25. It comprises a base 27A extending parallel to the second electronic card 25. It also comprises a body 27D, of generally parallelepipedic shape and extending upwards from an upper face of base 27A. This body is pressed against the chip integrating the array of micro-mirrors 24 so as to conduct the heat produced by the array of micro-mirrors 24 into the assembly of the second heat sink 27. The second heat sink 27 also comprises a set of pins 27B extend generally vertically downward from base 27A. The pins 27B form a grid of rectangular outer shape, a first side of which extends parallel to the longitudinal axis X and a second side extends parallel to the transverse axis Y. This set of pins 27B is framed to the right and to left by two blanks 27C extending longitudinally and vertically.

Le nombre de picots 26B, 27B peut être quelconque. En variante, les picots pourraient être remplacés par des ailettes, orientées parallèlement au flux d'air destiné à traverser le dissipateur thermique, c'est-à-dire parallèlement à l'axe longitudinal X.The number of pins 26B, 27B can be arbitrary. As a variant, the pins could be replaced by fins, oriented parallel to the flow of air intended to cross the heat sink, that is to say parallel to the longitudinal axis X.

Deux cheminées 30A, 30B sont agencées de part et d'autre du premier dissipateur thermique 26. Ces deux cheminées permettent de mettre en communication la première zone Z1 avec l'extérieur du module d'éclairage. Les deux cheminées constituent donc les sorties d'air 30 de la première zone Z1. Les deux cheminées traversent la deuxième zone Z2 de part et d'autre du premier dissipateur thermique 26. Elles s'étendent verticalement et sont sensiblement inclinée vers l'arrière du module d'éclairage. Autrement dit, l'axe des cheminées 30A, 30B forme avec l'axe vertical un angle non nul. Les deux cheminées débouchent d'une part dans la première zone au niveau d'un point haut de la première zone Z1, c'est-à-dire au niveau du plan de séparation entre la première zone et la deuxième zone du coté de la grande base du trapèze formant une section transversale de la première zone Z1. D'autre part, les deux cheminées 30A, 30B débouchent en vis-à-vis des deux ouvertures supérieures 13 du boîtier 10. Les cheminées ont une section ellipsoïdale mais, en variante pourraient avoir une section de toute autre forme. En variante, le nombre de ces cheminées pourrait également être différent. Le module d'éclairage pourrait ne comprendre qu'une seule cheminée ou bien plus de deux cheminées. Avantageusement, les deux cheminées et le premier dissipateur thermique forment une seule et même pièce.Two chimneys 30A, 30B are arranged on either side of the first heat sink 26. These two chimneys make it possible to place the first zone Z1 in communication with the outside of the lighting module. The two chimneys therefore constitute the air outlets 30 of the first zone Z1. The two chimneys pass through the second zone Z2 on either side of the first heat sink 26. They extend vertically and are substantially inclined towards the rear of the lighting module. In other words, the axis of the chimneys 30A, 30B forms a non-zero angle with the vertical axis. The two chimneys emerge on the one hand in the first zone at the level of a high point of the first zone Z1, that is to say at the level of the plane of separation between the first zone and the second zone on the side of the large base of the trapezoid forming a cross section of the first zone Z1. On the other hand, the two chimneys 30A, 30B emerge opposite the two upper openings 13 of the box 10. The chimneys have an ellipsoidal section but, as a variant, could have a section of any other shape. As a variant, the number of these chimneys could also be different. The lighting module could include only one chimney or even more than two chimneys. Advantageously, the two chimneys and the first heat sink form one and the same part.

En référence à la figure 6, le module d'éclairage 3 comprend également deux ventilateurs 31, 32 agencés à l'arrière du module d'éclairage, et aptes à générer un flux d'air dans chacune des trois zones Z1, Z2 et Z3. Plus particulièrement, un premier ventilateur 31 est agencé de sorte à générer un flux d'air uniquement dans la première zone Z1 et dans la troisième zone Z3 et un deuxième ventilateur 32 est agencé de sorte à générer un flux d'air uniquement dans la deuxième zone Z2. Le premier dissipateur thermique 26, associé à la diode électroluminescente 22, bénéfice donc d'un ventilateur dédié ce qui permet un refroidissement particulièrement efficace de la diode électroluminescente. Les deux ventilateurs 31, 32 sont agencés verticalement l'un au dessus de l'autre. Avantageusement, les deux ventilateurs peuvent être identiques ou tout au moins avoir une forme extérieure sensiblement identique. Ils comprennent chacun au moins une pâle rotative 31A, 32A, et un moteur électrique apte à entraîner la pâle en rotation. Le module d'éclairage comprend une entrée d'air 33 à l'arrière de chaque ventilateur par laquelle de l'air frais peut être aspiré pour pénétrer dans le module d'éclairage. En variante, chaque ventilateur pourrait être remplacé par tout autre moyen de génération d'un flux d'air 31', 32'. Notamment, les deux ventilateurs pourraient être remplacés par un seul ventilateur plus puissant.With reference to the figure 6 , the lighting module 3 also comprises two fans 31, 32 arranged at the rear of the lighting module, and able to generate an air flow in each of the three zones Z1, Z2 and Z3. More particularly, a first fan 31 is arranged so as to generate an air flow only in the first zone Z1 and in the third zone Z3 and a second fan 32 is arranged so as to generate an air flow only in the second Z2 area. The first heat sink 26, associated with the light-emitting diode 22, therefore benefits from a dedicated fan which allows cooling particularly effective light-emitting diode. The two fans 31, 32 are arranged vertically one above the other. Advantageously, the two fans can be identical or at least have a substantially identical external shape. They each include at least one rotary blade 31A, 32A, and an electric motor able to drive the blade in rotation. The lighting module includes an air inlet 33 at the rear of each fan through which fresh air can be sucked into the lighting module. As a variant, each fan could be replaced by any other means of generating an air flow 31', 32'. In particular, the two fans could be replaced by a single more powerful fan.

Lorsque les ventilateurs fonctionnent, le flux d'air dans chacune des zones Z1, Z2 et Z3 est orienté sensiblement longitudinalement de l'arrière vers l'avant. Les flux d'air traversant les trois zones Z1, Z2, Z3 sont indépendants. Ils ne se mélangent pas. Toutefois, les trois zones Z1, Z2, Z3 ne doivent pas nécessairement être parfaitement étanches à l'air l'une par rapport à l'autre et des fuites d'air entre les zones peuvent exister tant qu'elles restent minimes par rapport au flux d'air traversant chacune des zones.When the fans are operating, the air flow in each of the zones Z1, Z2 and Z3 is oriented substantially longitudinally from the rear to the front. The air flows passing through the three zones Z1, Z2, Z3 are independent. They don't mix. However, the three zones Z1, Z2, Z3 do not necessarily have to be perfectly airtight with respect to each other and air leaks between the zones may exist as long as they remain minimal with respect to the airflow passing through each of the zones.

Le flux d'air dans la première zone Z1, représenté sur les figures 4 et 7 par une première flèche F1. Le flux d'air dans la première zone Z1 est généré par le premier ventilateur et est guidé entre la première carte électronique et la deuxième carte électronique. Il refroidit par convection la diode électroluminescente 22 et la matrice de micro-miroirs 24 puis s'échappe vers le haut au travers des deux cheminées 30A, 30B communiquant avec les deux ouvertures supérieures 13 du boîtier. En remarque, même quand le premier ventilateur ne fonctionne pas, l'air chaud plus léger que l'air froid aura tendance à sortir de la première zone au travers des deux cheminées puisque celles-ci s'étendent depuis la partie la plus haute de la première zone Z1. L'air chaud, plus léger que l'air froid, aura tendance à ressortir naturellement par les deux cheminées pour laisser la place à de l'air plus froid pénétrant par l'entrée d'air 33 à l'arrière du module d'éclairage. Ainsi, L'architecture de la première zone Z1 est favorable à un refroidissement minimal naturel de la première zone Z1. Ce phénomène s'ajoute à la contribution du premier ventilateur 31, de manière à rendre le refroidissement optimal.The air flow in the first zone Z1, represented on the figure 4 and 7 by a first arrow F1. The airflow in the first zone Z1 is generated by the first fan and is guided between the first electronic card and the second electronic card. It cools the light-emitting diode 22 and the matrix of micro-mirrors 24 by convection then escapes upwards through the two chimneys 30A, 30B communicating with the two upper openings 13 of the case. As a side note, even when the first fan is not running, hot air lighter than cold air will tend to come out of the first zone. through the two chimneys since these extend from the highest part of the first zone Z1. Hot air, lighter than cold air, will tend to come out naturally through the two chimneys to make way for colder air entering through the air inlet 33 at the rear of the module. lighting. Thus, the architecture of the first zone Z1 is favorable to a natural minimum cooling of the first zone Z1. This phenomenon is added to the contribution of the first fan 31, so as to make the cooling optimal.

Le flux d'air dans la deuxième zone Z2, représenté sur les figures 4 et 7 par une deuxième flèche F2, traverse le premier dissipateur thermique et ressort du projecteur au travers de la première ouverture frontale 11 du boîtier 10. L'air frais aspiré par le deuxième ventilateur traverse le premier dissipateur thermique en se glissant autour des picots 26B. Le flux d'air dans la deuxième zone est canalisé latéralement entre les deux flans 26C, la base 26A et un côté supérieur du boîtier 10. Un échange thermique se produit entre l'air frais et le dissipateur thermique plus chaud. Cet échange thermique contribue à abaisser la température du premier dissipateur thermique 26 et donc de la première carte électronique 23, ainsi que de la diode électroluminescente 22.The air flow in the second zone Z2, represented on the figure 4 and 7 by a second arrow F2, passes through the first heat sink and exits from the projector through the first front opening 11 of the housing 10. The fresh air sucked in by the second fan passes through the first heat sink by sliding around the pins 26B. The airflow in the second zone is channeled laterally between the two blanks 26C, the base 26A and an upper side of the casing 10. A heat exchange occurs between the cool air and the hotter heat sink. This heat exchange contributes to lowering the temperature of the first heat sink 26 and therefore of the first electronic card 23, as well as of the light-emitting diode 22.

Le flux d'air dans la troisième zone Z3, représenté sur les figures 4 et 7 par une troisième flèche F3, traverse le deuxième dissipateur thermique 27 et ressort du projecteur au travers de la deuxième ouverture frontale 12 du boîtier 10. Une première partie du flux d'air dans la troisième zone Z3 circule entre la deuxième carte électronique 25 et la base 27A du deuxième dissipateur thermique 27. Une deuxième partie du flux d'air dans la troisième zone Z3 traverse le deuxième dissipateur thermique 27 en se glissant autour de ses picots 27B. Cette deuxième partie est canalisée entre les deux flans 27C latéraux, la base 27A et un côté inférieur du boîtier 10. Un échange thermique se produit entre l'air frais et le dissipateur thermique plus chaud. Cet échange thermique contribue à abaisser la température du deuxième dissipateur thermique 27 et donc de la deuxième carte électronique 25 et de la matrice de micro-miroirs 24. Le flux d'air ressort de la troisième zone Z3 en passant au travers de la deuxième ouverture frontale 12 du boîtier.The air flow in the third zone Z3, represented on the figure 4 and 7 by a third arrow F3, passes through the second heat sink 27 and exits from the headlight through the second front opening 12 of the casing 10. A first part of the air flow in the third zone Z3 circulates between the second electronic card 25 and the base 27A of the second heat sink 27. A second part of the air flow in the third zone Z3 crosses the second heat sink 27 by slipping around its pins 27B. This second part is channeled between the two side blanks 27C, the base 27A and one side bottom of the housing 10. A thermal exchange occurs between the cool air and the hotter heat sink. This heat exchange contributes to lowering the temperature of the second heat sink 27 and therefore of the second electronic card 25 and of the matrix of micro-mirrors 24. The flow of air emerges from the third zone Z3 by passing through the second opening front 12 of the case.

Lorsque la diode électroluminescente émet un rayon lumineux, celui-ci traverse tout d'abord la lentille de collimation 28 puis le prisme d'optique 29 avant d'atteindre la matrice de micro-miroirs 24. Si le rayon lumineux atteint un micro-miroir en orientation active, il est réfléchi vers le prisme d'optique 29 d'où il sera dévié vers l'optique de projection 21. Il traverse alors les différentes lentilles formant l'optique de projection, et émerge ainsi du projecteur vers l'avant pour éclairer la route ou l'environnement du véhicule. Un tel cheminement est représenté par une ligne R1 en pointillées sur la figure 4. Si le rayon lumineux atteint un micro-miroir en orientation inactive, celui-ci est dévié hors de l'optique de projection 21 et ne participe pas à l'éclairage de la route ou de l'environnement du véhicule. Si un rayon lumineux parasite sort du module d'éclairage par l'une des cheminées 30A, 30B, par exemple en suivant le cheminement représenté par la ligne R2 sur la figure 4, il ne participe pas non plus à l'éclairage de la route ou de l'environnement du véhicule car la cheminée est inclinée vers l'arrière. Ainsi, l'inclinaison vers l'arrière des cheminées évite de rendre visible des rayons lumineux qui sortiraient de manière parasite du module d'éclairage par les cheminées 30A, 30B.When the light-emitting diode emits a light ray, the latter first passes through the collimating lens 28 then the optical prism 29 before reaching the matrix of micro-mirrors 24. If the light ray reaches a micro-mirror in active orientation, it is reflected towards the optical prism 29 from where it will be deflected towards the projection optics 21. It then passes through the various lenses forming the projection optics, and thus emerges from the projector forwards to illuminate the road or the surroundings of the vehicle. Such a path is represented by a dotted line R1 on the figure 4 . If the light ray reaches a micro-mirror in inactive orientation, the latter is deflected out of the projection optics 21 and does not contribute to the lighting of the road or the environment of the vehicle. If a stray light ray leaves the lighting module through one of the chimneys 30A, 30B, for example by following the path represented by the line R2 on the figure 4 , it also does not participate in the lighting of the road or the environment of the vehicle because the chimney is tilted towards the rear. Thus, the rearward inclination of the chimneys avoids making visible the light rays which would emerge parasitically from the lighting module via the chimneys 30A, 30B.

Naturellement, l'invention ne se limite pas au mode de réalisation décrit. Notamment, en variante, la sortie d'air 30 de la première zone Z1, qui peut être sous la forme d'une ou de plusieurs cheminées 30A, 30B, pourrait ne pas déboucher vers le haut mais sur les cotés droit et/ou gauche, ou vers le bas, voire à l'arrière du module d'éclairage 3. Avantageusement, dans tous les cas, la sortie d'air est avantageusement sensiblement inclinée vers l'arrière pour éviter que des rayons lumineux parasites ne soient rendus visibles à l'avant du véhicule en passant par le sortie d'air.Naturally, the invention is not limited to the embodiment described. In particular, as a variant, the air outlet 30 of the first zone Z1, which can be in the form of one or more chimneys 30A, 30B, could not lead upwards but on the right and/or left sides. , or towards the bottom, or even at the rear of the lighting module 3. Advantageously, in all cases, the air outlet is advantageously substantially inclined towards the rear to prevent stray light rays from being made visible at the front of the vehicle through the air outlet.

Grâce à l'invention, on obtient un module d'éclairage dans lequel on fait circuler un flux d'air non seulement autour de dissipateurs thermiques mais également autour de la source lumineuse 22' et de la matrice de micro-miroirs. Les flux d'airs sont indépendants, ce qui permet d'obtenir un refroidissement particulièrement efficace. Comparativement aux modules lumineux connus, la température de la source lumineuse peut être abaissée d'environ 10°C et la température de la matrice de micro-miroirs peut être abaissée d'environ 5°C, ce qui améliore la durée de vie et la fiabilité de ces composants.Thanks to the invention, a lighting module is obtained in which a flow of air is made to circulate not only around the heat sinks but also around the light source 22' and the matrix of micro-mirrors. The air flows are independent, which makes it possible to obtain particularly efficient cooling. Compared with known light modules, the temperature of the light source can be lowered by about 10°C and the temperature of the micro-mirror array can be lowered by about 5°C, which improves the service life and the reliability of these components.

Claims (14)

  1. Lighting module (3) for a headlight (2) of a motor vehicle (1), comprising:
    - a first zone (Zl) comprising at least one light source (22') and a micro-mirror array (24),
    - a second zone (Z2) comprising a first heat sink (26) capable of dissipating the heat generated by the at least one light source (22'),
    - a third zone comprising a second heat sink (27) capable of dissipating the heat generated by the micro-mirror array (24),
    - at least one airstream generation means (31', 32') for generating an airstream in the first zone (Z1), in the second zone (Z2) and in the third zone (Z3),
    the first zone (Z1), the second zone (Z2) and the third zone (Z3) being distinct from one another, the first zone (Z1) being arranged vertically between the second zone (Z2) and the third zone (Z3), the first zone (Z1) comprising an air outlet (30), characterized in that the airstream generation means (31', 32') comprises at least one first fan (31) capable of generating an airstream only in the first zone (Z1) and in the third zone (Z3) and a second fan (32) capable of generating an airstream only in the second zone (Z2).
  2. Lighting module (3) according to the preceding claim, characterized in that the air outlet (30) of the first zone (Z1) is oriented upwards through a top face of the lighting module.
  3. Lighting module (3) according to one of the preceding claims, characterized in that said air outlet (30) comprises at least one chimney (30a, 30b) passing through the second zone (Z2), notably two chimneys (30a, 30b) passing through the second zone (Z2) on either side of the first heat sink (26) .
  4. Lighting module (3) according to the preceding claim, characterized in that the at least one chimney (30a, 30b) is oriented vertically and is inclined towards the back of the lighting module (3) .
  5. Lighting module (3) according to one of Claims 1 to 3, characterized in that the air outlet (30) of the first zone (Z1) is inclined towards the back of the lighting module (3).
  6. Lighting module (3) according to one of the preceding claims, characterized in that the second zone (Z2) is arranged above the first zone (Z1), and in that the third zone (Z3) is arranged below the first zone (Z1).
  7. Lighting module (3) according to one of the preceding claims, characterized in that the first zone (Z1) is delimited from the second zone (Z2) at least partially by a first electronic circuit board (23) supporting the at least one light source (22') and/or by a base (26a) of the first heat sink (26), and/or in that the first zone (Z1) is delimited from the third zone (Z3) at least partially by a second electronic circuit board (25) supporting the micro-mirror array (24) and/or by a base (27a) of the second heat sink (27).
  8. Lighting module (3) according to one of the preceding claims, characterized in that it comprises a projection optic (21) capable of guiding light rays reflected by the micro-mirror array (24), the first zone (Z1) and/or the second zone (Z2) comprising an air outlet above the projection optic.
  9. Lighting module (3) according to one of the preceding claims, characterized in that the second zone (Z2) and/or the third zone (Z3) comprises an air outlet (34, 35) towards the front.
  10. Lighting module (3) according to one of the preceding claims, characterized in that the first zone (Z1) and/or the second zone (Z2) and/or the third zone (Z3) comprise an air inlet (33) from the rear.
  11. Lighting module (3) according to the preceding claim, characterized in that the two fans (31, 32) are arranged parallel one on top of the other.
  12. Lighting module (3) according to the preceding claim, characterized in that the at least one light source (22') comprises at least one light-emitting diode (22).
  13. Headlight (2) comprising a lighting module (3) according to one of the preceding claims.
  14. Motor vehicle (1), characterized in that it comprises a lighting module (3) according to one of Claims 1 to 12 or a headlight (2) according to the preceding claim.
EP19164754.4A 2018-03-23 2019-03-22 Lighting module provided with a micro-mirror array with optimised cooling Active EP3543597B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1852522A FR3079283B1 (en) 2018-03-23 2018-03-23 LIGHTING MODULE EQUIPPED WITH A MATRIX OF MICRO-MIRRORS WITH OPTIMIZED COOLING

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EP3543597A1 EP3543597A1 (en) 2019-09-25
EP3543597B1 true EP3543597B1 (en) 2022-05-25

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CN111561685B (en) * 2019-09-30 2022-08-19 长城汽车股份有限公司 Lighting apparatus and vehicle
CN111692573B (en) * 2019-09-30 2022-02-25 长城汽车股份有限公司 Lighting device and vehicle

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KR101220063B1 (en) * 2010-11-19 2013-01-08 주식회사 에스엘라이팅 Intelligent head lamp assembly of vehicle
FR3034494B1 (en) * 2015-03-30 2018-04-27 Valeo Vision LUMINOUS MODULE FOR MOTOR VEHICLE PROJECTOR
CN108027125A (en) * 2015-09-29 2018-05-11 松下知识产权经营株式会社 Light supply apparatus and light projector device
FR3044393B1 (en) * 2015-11-27 2019-04-26 Valeo Vision MOTOR VEHICLE PROJECTOR LIGHTING MODULE AND PROJECTOR
JP6386437B2 (en) * 2015-12-08 2018-09-05 トヨタ自動車株式会社 Vehicle headlamp
AT518220B1 (en) * 2016-02-02 2017-11-15 Zkw Group Gmbh Lighting unit for a motor vehicle

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CN110296374A (en) 2019-10-01
CN110296374B (en) 2022-10-28
FR3079283B1 (en) 2020-10-02
EP3543597A1 (en) 2019-09-25

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