EP3301351B1 - Integral mounting for luminous device with micro-mirror array - Google Patents

Integral mounting for luminous device with micro-mirror array

Info

Publication number
EP3301351B1
EP3301351B1 EP17192239.6A EP17192239A EP3301351B1 EP 3301351 B1 EP3301351 B1 EP 3301351B1 EP 17192239 A EP17192239 A EP 17192239A EP 3301351 B1 EP3301351 B1 EP 3301351B1
Authority
EP
European Patent Office
Prior art keywords
optical
microsystem
light
forming
support
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
EP17192239.6A
Other languages
German (de)
French (fr)
Other versions
EP3301351A1 (en
Inventor
Joel LI
Sylvain CHANEZ
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Vision SAS
Original Assignee
Valeo Vision SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valeo Vision SAS filed Critical Valeo Vision SAS
Publication of EP3301351A1 publication Critical patent/EP3301351A1/en
Application granted granted Critical
Publication of EP3301351B1 publication Critical patent/EP3301351B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/39—Attachment thereof
    • 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
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/13—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source characterised by the type of light source
    • F21S43/14—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
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/19—Attachment of light sources or lamp holders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/26—Refractors, transparent cover plates, light guides or filters not provided in groups F21S43/235 - F21S43/255
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/30—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by reflectors
    • F21S43/31—Optical layout thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/30—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by reflectors
    • F21S43/37—Attachment thereof
    • 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
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • 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
    • F21V5/00—Refractors for light sources
    • F21V5/002—Refractors for light sources using microoptical elements for redirecting or diffusing light
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the invention relates to the field of lighting and light signaling, in particular for motor vehicles. More particularly, the invention relates to a light signaling device capable of producing light pictograms by means of a microelectromechanical system with a matrix of micro-mirrors.
  • the published patent document US 2015/0175054 A1 discloses a lighting device for a motor vehicle headlight.
  • the device comprises a laser-type light source, a microelectromechanical system serving as a deflector for the laser light, a phosphor-type luminophore element capable of converting the monochromatic light reflected by the deflector, and an optical device comprising several lenses receiving the white light coming from the luminophore element.
  • the deflector can be controlled so as to modulate the light image thus produced.
  • the device comprises a support for supporting these different elements.
  • the support is made up of several parts assembled together, directly or indirectly, for example via the housing of the device or the headlight.
  • the invention aims to overcome at least one of the drawbacks of the aforementioned state of the art. More particularly, the invention aims to propose a solution ensuring precise positioning of the optical components of a light device comprising a microelectromechanical system provided with one or more mirrors.
  • the invention relates to a light device according to claim 1.
  • the support comprises a single-piece body, preferably made of aluminum, said body forming the reception areas for the light source(s), the optical shaping device and the optical projection device.
  • the cavity is delimited by the reception zone of the optical shaping device and the reception zone of the optical projection device.
  • the light source(s), the optical shaping device and the microsystem form a first optical axis
  • said microsystem and the optical projection device form a second optical axis, the angle between said optical axes being between 40° and 65°, preferably between 45° and 60°.
  • the light source(s) are of the light-emitting diode type on a plate arranged on a radiator fixed to the receiving area of said light source(s).
  • the light source(s), of the light-emitting diode type are arranged via a base directly on the radiator fixed to the receiving area of said light source(s).
  • the optical shaping device comprises a biconvex lens and/or the projection device comprises a biconvex lens and a biconcave lens.
  • the or each of the lenses of the optical device(s) is held in place by a flange, fixed for example by screwing, gluing, welding, crimping, riveting, by means of dowels or rivets, or any other fixing means, or by the combination of two or more of these means.
  • the optical shaping device has a diameter greater than twice, preferably three times, that of the optical projection device.
  • the microsystem is on a printed circuit board, said board being fixed to the support so as to press said microsystem against the receiving area of said microsystem.
  • the light device is a rear signaling light capable of forming pictograms in the light beam produced, said pictograms being a function of programming of the microsystem.
  • the measures of the invention are interesting in that they make it possible to ensure exact positioning of the various components, including the microelectromechanical system while it is on a printed circuit board.
  • the light device 2 is in this case a light signaling device for a motor vehicle. It essentially comprises a support 4, optical components arranged on the support 4 and a printed circuit board 6 with electronic components and an electromechanical optical microsystem 8.
  • the latter comprises a matrix of micro-mirrors capable of being individually pivotally controlled.
  • Such a microsystem is commonly called a micro-mirror matrix or DMD (acronym for “Digital Micromirror Device”).
  • DMD digital Micromirror Device
  • Each mirror can take two positions: it can tilt by 10 to 15° along the same axis so as to reflect the light either towards a diffusion lens or towards an absorbing surface. It is said to switch “ on ” or “off”, This regime is therefore binary.
  • Such a microsystem is in itself well known to those skilled in the art.
  • microelectromechanical system fixed to the printed circuit board can then be fixed to the support so that the microelectromechanical system is under pressure on the pads 28.3, thus ensuring contact and, therefore, exact positioning in the direction perpendicular to the face 10.3 of the body 10.
  • Means for positioning the board, in the plane of said board, can be provided, such as in particular pins passing through orifices in the board and in the body 10 at the level of the face 10.3.
  • the diaphragm 24 can be observed in the cavity 30 as well as its method of fixing.
  • the tab 24.1 forming the diaphragm comprises at its end opposite the orifice 24.2 two orifices 24.3 cooperating with positioning rods embedded in the body. It also comprises a fixing orifice 24.4 central relative to the positioning orifices 24.3, said orifice receiving a fixing screw engaging with the body 10.
  • the body 10 comprises in the cavity 30 a recess forming a bearing surface for the tongue 24.1, allowing the latter to pass under the element 28 (according to the point of view of the figure 3 ).
  • the orifice 24.2 is located at the end of the tab 24.1 which is located on the side of the shaping lens 20, so as to avoid any obstruction of the light beam propagating from the shaping lens 20 towards the microelectromechanical system.
  • the proximity between this beam and the edge of the tab 24.1 at the orifice 24.2 is visible at the figure 2 .
  • FIG 4 corresponds to the figure 3 , where however the element 28 is absent.
  • the first lens 22.1 of the optical projection device 22 is held in place on the body 10 by means of a first flange 32.
  • This may have an open profile, in this case U-shaped, with the opening directed towards the shaping lens 20.
  • the shaping lens 20 and the first lens 22.1 are in fact very close to each other to the point that no space is available for a portion of flange between the two lenses.
  • the first flange 32 is advantageously fixed to the body 10 by screws engaging in threaded holes made in said body.
  • the shaping lens 20 and the second lens 22.2 are placed from outside the body by insertion into the respective receiving areas.
  • the first lens 22.1 is, for its part, placed via the cavity 30.

Landscapes

  • 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)
  • Mechanical Engineering (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Description

L'invention a trait au domaine de l'éclairage et de la signalisation lumineuse, notamment pour véhicule automobile. Plus particulièrement, l'invention a trait à un dispositif lumineux de signalisation apte à produire des pictogrammes lumineux au moyen d'un microsystème électromécanique avec une matrice de micro-miroirs.The invention relates to the field of lighting and light signaling, in particular for motor vehicles. More particularly, the invention relates to a light signaling device capable of producing light pictograms by means of a microelectromechanical system with a matrix of micro-mirrors.

Le document de brevet publié US 2015/0175054 A1 divulgue un dispositif lumineux pour projecteur de véhicule automobile. Le dispositif comprend une source lumineuse du type laser, un microsystème électromécanique servant de déflecteur de la lumière du laser, un élément luminophore du type phosphore apte à convertir la lumière monochromatique réfléchie par le déflecteur, et un dispositif optique comprenant plusieurs lentilles recevant la lumière blanche provenant de l'élément luminophore. Le déflecteur peut être piloté de manière à moduler l'image lumineuse ainsi produite. Le dispositif comprend un support pour supporter ces différents éléments. Le support est constitué de plusieurs parties assemblées les unes aux autres, directement ou indirectement comme par exemple via le boîtier du dispositif ou du projecteur. Un tel assemblage a cependant pour conséquence de former des chaînes de tolérances diminuant la précision de positionnement relatif des différents éléments. Dans certaines configurations optiques, notamment lorsque la source lumineuse est très proche du déflecteur, des tolérances serrées sont requise pour atteindre un résultat satisfaisant. De plus, dans cet enseignement, le déflecteur est disposé sur la face intérieure d'une paroi du support, alors que ce type composant est habituellement fixé sur une platine avec circuit imprimé, une telle platine étant potentiellement encombrante, notamment lorsque de nombreux composants électroniques sont nécessaires pour le contrôle du déflecteur.The published patent document US 2015/0175054 A1 discloses a lighting device for a motor vehicle headlight. The device comprises a laser-type light source, a microelectromechanical system serving as a deflector for the laser light, a phosphor-type luminophore element capable of converting the monochromatic light reflected by the deflector, and an optical device comprising several lenses receiving the white light coming from the luminophore element. The deflector can be controlled so as to modulate the light image thus produced. The device comprises a support for supporting these different elements. The support is made up of several parts assembled together, directly or indirectly, for example via the housing of the device or the headlight. However, such an assembly has the consequence of forming chains of tolerances reducing the precision of relative positioning of the different elements. In certain optical configurations, in particular when the light source is very close to the deflector, tight tolerances are required to achieve a satisfactory result. Furthermore, in this teaching, the deflector is arranged on the inner face of a wall of the support, whereas this type of component is usually fixed on a board with printed circuit, such a board being potentially bulky, in particular when numerous electronic components are necessary for the control of the deflector.

Par ailleurs, les documents US 2006/078266 A1 et JP 2016 091976 A décrivent des dispositif connus comportant une matrice de micro-miroirs.Furthermore, the documents US 2006/078266 A1 And JP 2016 091976 A describe known devices comprising a matrix of micro-mirrors.

L'invention a pour objectif de pallier au moins un des inconvénients de l'état de la technique susmentionné. Plus particulièrement, l'invention a pour objectif de proposer une solution assurant un positionnement précis des composants optiques d'un dispositif lumineux comprenant un microsystème électromécanique pourvu d'un ou plusieurs miroirs.The invention aims to overcome at least one of the drawbacks of the aforementioned state of the art. More particularly, the invention aims to propose a solution ensuring precise positioning of the optical components of a light device comprising a microelectromechanical system provided with one or more mirrors.

L'invention a pour objet dispositif lumineux conforme à la revendication 1.The invention relates to a light device according to claim 1.

Selon l'invention, le support comprend un corps d'un seul tenant, préférentiellement en aluminium, ledit corps formant les zones de réception de la ou des sources lumineuses, du dispositif optique de mise en forme et du dispositif optique de projection.According to the invention, the support comprises a single-piece body, preferably made of aluminum, said body forming the reception areas for the light source(s), the optical shaping device and the optical projection device.

Selon l'invention, le support comprend une plaque apte à être fixée au corps en vue de refermer partiellement la cavité et comprenant la surface extérieure formant la zone de réception du microsystème.According to the invention, the support comprises a plate capable of being fixed to the body in order to partially close the cavity and comprising the outer surface forming the reception area of the microsystem.

Selon un mode avantageux de l'invention, la cavité est recouverte d'un revêtement antireflet, et/ou absorbant, préférentiellement noir.According to an advantageous embodiment of the invention, the cavity is covered with an anti-reflective and/or absorbent coating, preferably black.

Selon un mode avantageux de l'invention, la cavité est délimitée par la zone de réception du dispositif optique de mise en forme et la zone de réception du dispositif optique de projection.According to an advantageous embodiment of the invention, the cavity is delimited by the reception zone of the optical shaping device and the reception zone of the optical projection device.

Selon un mode avantageux de l'invention, au moins une, préférentiellement chacune, des zones de réception des dispositifs optiques comprend un orifice pratiqué dans le support et un épaulement autour dudit orifice.According to an advantageous embodiment of the invention, at least one, preferably each, of the reception zones of the optical devices comprises an orifice made in the support and a shoulder around said orifice.

Selon un mode avantageux de l'invention, le dispositif comprend au sein de la cavité une languette en porte-à-faux avec un orifice destiné à être traversé par la lumière réfléchie par le microsystème vers le dispositif optique de projection.According to an advantageous embodiment of the invention, the device comprises within the cavity a cantilevered tongue with an orifice intended to be crossed by the light reflected by the microsystem towards the optical projection device.

Selon un mode avantageux de l'invention, la ou les sources lumineuses, le dispositif optique de mise en forme et le microsystème forment un premier axe optique, et ledit microsystème et le dispositif optique de projection forment un deuxième axe optique, l'angle entre lesdits axes optiques étant compris entre 40° et 65°, préférentiellement entre 45° et 60°.According to an advantageous embodiment of the invention, the light source(s), the optical shaping device and the microsystem form a first optical axis, and said microsystem and the optical projection device form a second optical axis, the angle between said optical axes being between 40° and 65°, preferably between 45° and 60°.

Selon un mode avantageux de l'invention, la ou les sources lumineuses sont du type diode à électroluminescence sur une platine disposées sur un radiateur fixé sur la zone de réception de ladite ou desdites sources lumineuses. Selon un autre mode avantageux de l'invention, alternatif au mode ci-avant, la ou les sources lumineuses, du type diode à électroluminescence, sont disposées via une embase directement sur le radiateur fixé sur la zone de réception de ladite ou desdites sources lumineuses.According to an advantageous embodiment of the invention, the light source(s) are of the light-emitting diode type on a plate arranged on a radiator fixed to the receiving area of said light source(s). According to another advantageous embodiment of the invention, alternative to the above embodiment, the light source(s), of the light-emitting diode type, are arranged via a base directly on the radiator fixed to the receiving area of said light source(s).

Selon un mode avantageux de l'invention, le dispositif optique de mise en forme comprend une lentille biconvexe et/ou le dispositif de projection comprend une lentille biconvexe et une lentille biconcave.According to an advantageous embodiment of the invention, the optical shaping device comprises a biconvex lens and/or the projection device comprises a biconvex lens and a biconcave lens.

Selon un mode avantageux de l'invention, la ou chacune des lentilles du ou des dispositifs optique est maintenue en place par une bride, fixée par exemple par vissage, collage, soudure, sertissage, bouterollage, par le biais de cheville ou de rivets, ou tout autre moyen de fixation, ou par la combinaison de deux ou plusieurs de ces moyens.According to an advantageous embodiment of the invention, the or each of the lenses of the optical device(s) is held in place by a flange, fixed for example by screwing, gluing, welding, crimping, riveting, by means of dowels or rivets, or any other fixing means, or by the combination of two or more of these means.

Selon un mode avantageux de l'invention, le dispositif optique de mise en forme présente un diamètre supérieur à deux fois, préférentiellement trois fois, celui du dispositif optique de projection.According to an advantageous embodiment of the invention, the optical shaping device has a diameter greater than twice, preferably three times, that of the optical projection device.

Selon un mode avantageux de l'invention, le microsystème est sur une platine à circuit imprimé, ladite platine étant fixée au support de manière à plaquer ledit microsystème contre la zone de réception dudit microsystème.According to an advantageous embodiment of the invention, the microsystem is on a printed circuit board, said board being fixed to the support so as to press said microsystem against the receiving area of said microsystem.

Selon un mode avantageux de l'invention, le dispositif lumineux est un feu arrière de signalisation apte à former des pictogrammes dans le faisceau lumineux produit, lesdits pictogrammes étant fonction d'une programmation du microsystème.According to an advantageous embodiment of the invention, the light device is a rear signaling light capable of forming pictograms in the light beam produced, said pictograms being a function of programming of the microsystem.

Les mesures de l'invention sont intéressantes en ce qu'elles permettent d'assurer un positionnement exact des différents composants, y compris le microsystème électromécanique alors que celui-ci est sur une platine à circuit imprimé.The measures of the invention are interesting in that they make it possible to ensure exact positioning of the various components, including the microelectromechanical system while it is on a printed circuit board.

D'autres caractéristiques et avantages de la présente invention seront mieux compris à l'aide de la description et des dessins parmi lesquels

  • La figure 1 est une représentation en perspective d'un dispositif lumineux conforme à l'invention ;
  • La figure 2 est une représentation en perspective des composants optiques du dispositif lumineux de la figure 1 ;
  • La figure 3 est une vue du dessous du support du dispositif lumineux de la figure 1 ;
  • La figure 4 correspond à la figure 3 où la plaque de fermeture partielle de la cavité du support est absente ;
  • La figure 5 est une vue en coupe longitudinale médiane du dispositif lumineux de la figure 1.
Other features and advantages of the present invention will be better understood with the aid of the description and the drawings among which
  • There figure 1 is a perspective representation of a light device according to the invention;
  • There figure 2 is a perspective representation of the optical components of the light device of the figure 1 ;
  • There figure 3 is a view from below of the support of the light device of the figure 1 ;
  • There figure 4 corresponds to the figure 3 where the partial closing plate of the support cavity is absent;
  • There Figure 5 is a median longitudinal sectional view of the light device of the figure 1 .

Les figures 1 à 5 illustrent un mode de réalisation de l'invention, étant entendu que d'autres modes de réalisation sont envisageables.THE figures 1 to 5 illustrate one embodiment of the invention, it being understood that other embodiments are conceivable.

La figure 1 est une représentation en perspective d'un dispositif lumineux 2 conforme à l'invention. Le dispositif lumineux 2 est en l'occurrence un dispositif de signalisation lumineuse pour véhicule automobile. Il comprend, essentiellement un support 4, des composants optiques disposés sur le support 4 et une platine à circuit imprimé 6 avec des composants électroniques et un microsystème optique électromécanique 8. Ce dernier comprend une matrice de micro-miroirs aptes à être commandés en pivotement de manière individuelle. Un tel microsystème est couramment appelé matrice de micro-miroirs ou DMD (acronyme pour « Digital Micromirror Device »). Chaque miroir peut prendre deux positions : il peut s'incliner de 10 à 15° suivant le même axe de façon à réfléchir la lumière soit vers une lentille de diffusion soit vers une surface absorbante. On dit qu'il commute « on » ou « off », ce régime est donc binaire. Un tel microsystème est en soi bien connu de l'homme de métier.There figure 1 is a perspective representation of a light device 2 according to the invention. The light device 2 is in this case a light signaling device for a motor vehicle. It essentially comprises a support 4, optical components arranged on the support 4 and a printed circuit board 6 with electronic components and an electromechanical optical microsystem 8. The latter comprises a matrix of micro-mirrors capable of being individually pivotally controlled. Such a microsystem is commonly called a micro-mirror matrix or DMD (acronym for “Digital Micromirror Device”). Each mirror can take two positions: it can tilt by 10 to 15° along the same axis so as to reflect the light either towards a diffusion lens or towards an absorbing surface. It is said to switch “ on ” or “off”, This regime is therefore binary. Such a microsystem is in itself well known to those skilled in the art.

Le support 4 du dispositif lumineux 2 comprend un corps 10 sur lequel est monté un radiateur 12. Ce dernier comprend une portion étendue 12.1 recevant une platine 14 avec une ou plusieurs sources lumineuses 16, par exemple du type diode à électroluminescence. Le radiateur 12 comprend également des ailettes 12.2 s'étendant essentiellement parallèlement l'une à l'autre depuis la portion étendue 12.1. Le corps 10 comprend une zone de réception 10.1 du radiateur 12 supportant la source lumineuse 16. Le corps forme un évidement 18 en vis-à-vis de la source lumineuse 16. Le fond de cet évidement 18 forme une zone de réception 10.2 d'une lentille 20 de mise en forme. Cette dernière forme un dispositif optique de mise en forme de la lumière émise par la source lumineuse 16. Le corps 10 forme une cavité (non visible à la figure 1) avec une ouverture sur la face inférieure 10.3 dudit corps. Le microsystème électromécanique 8 est disposé en vis-à-vis de cette ouverture afin de recevoir le faisceau lumineux formé par la lentille 20 de mise en forme. Le corps 10 comprend également une zone de réception 10.4 d'un dispositif optique de projection 22. Ce dernier peut comprendre deux lentilles dont une seule est visible à la figure 1.The support 4 of the light device 2 comprises a body 10 on which a radiator 12 is mounted. The latter comprises an extended portion 12.1 receiving a plate 14 with one or more light sources 16, for example of the light-emitting diode type. The radiator 12 also comprises fins 12.2 extending essentially parallel to each other from the extended portion 12.1. The body 10 comprises a receiving zone 10.1 of the radiator 12 supporting the light source 16. The body forms a recess 18 opposite the light source 16. The bottom of this recess 18 forms a receiving zone 10.2 of a shaping lens 20. The latter forms an optical device for shaping the light emitted by the light source 16. The body 10 forms a cavity (not visible in the figure 1 ) with an opening on the lower face 10.3 of said body. The microelectromechanical system 8 is arranged opposite this opening in order to receive the light beam formed by the shaping lens 20. The body 10 also comprises a receiving zone 10.4 of an optical projection device 22. The latter may comprise two lenses, only one of which is visible at the figure 1 .

Le corps 10 est avantageusement d'un seul tenant, par exemple en aluminium. Il en va de même pour le radiateur 12. Chacun de ces deux éléments peut être réalisé par usinage ou moulage suivi éventuellement d'opérations d'usinage.The body 10 is advantageously made of a single piece, for example made of aluminum. The same applies to the radiator 12. Each of these two elements can be produced by machining or molding followed possibly by machining operations.

La figure 2 illustre les composants optiques du dispositif lumineux 2 de la figure 1. On peut observer ceux-ci comprennent un diaphragme 24 formé par une languette 24.1 pourvue d'un orifice 24.2. Ce dernier est disposé entre le microsystème électromécanique 8 et le dispositif optique de projection 22. Le rôle du diaphragme est de couper les rayons lumineux qui se propagent de manière trop éloignée de la position nominale afin d'assurer une bonne définition, c'est-à-dire un bon piqué, de l'image créée par le système. Le dispositif optique de projection 22 comprend une première lentille 22.1 du type convergente et une deuxième lentille 22.2 du type divergente. La deuxième lentille présente une épaisseur importante au point de présenter une forme généralement cylindrique. La lentille 20 de mise en forme du faisceau de la lumière émise par la source lumineuse 16 est une lentille convergente biconvexe, configurée pour former un faisceau convergent vers le microsystème optique et éclairant la surface optique dudit système. On peut observer que la source lumineuse 16, la lentille 20 de mise en forme et le microsystème 8 sont alignés suivant un premier axe optique 26.1 et que ledit microsystème 8, le diaphragme 24 et le dispositif optique de projection 22 sont alignés suivant un deuxième axe optique 26.2. L'angle α formé par ces deux axes optiques est avantageusement compris entre 40° et 70°, préférentiellement entre 50° et 70°, ou entre 40° et 65°, ou encore entre 45° et 60°.There figure 2 illustrates the optical components of the light device 2 of the figure 1 . These can be seen to include a diaphragm 24 formed by a tab 24.1 provided with an orifice 24.2. The latter is arranged between the microelectromechanical system 8 and the optical projection device 22. The role of the diaphragm is to cut off the light rays which propagate too far from the nominal position in order to ensure good definition, i.e. good sharpness, of the image created by the system. The optical projection device 22 comprises a first lens 22.1 of the converging type and a second lens 22.2 of the diverging type. The second lens has a significant thickness to the point of having a generally cylindrical shape. The lens 20 for shaping the beam of light emitted by the light source 16 is a converging lens biconvex, configured to form a beam converging towards the optical microsystem and illuminating the optical surface of said system. It can be observed that the light source 16, the shaping lens 20 and the microsystem 8 are aligned along a first optical axis 26.1 and that said microsystem 8, the diaphragm 24 and the optical projection device 22 are aligned along a second optical axis 26.2. The angle α formed by these two optical axes is advantageously between 40° and 70°, preferably between 50° and 70°, or between 40° and 65°, or between 45° and 60°.

Les figures 3 et 4 illustrent le dispositif lumineux de la figure 1, sans la platine et le microsystème électromécanique, vu depuis la face inférieure du support.THE Figures 3 and 4 illustrate the light device of the figure 1 , without the plate and the microelectromechanical system, seen from the underside of the support.

A la figure 3, on peut observer que le support 4 comprend, en outre, un élément 28, de fermeture partielle de la cavité 30, au sein du corps 10. Cet élément 28 est formé par une plaque 28.1 pourvue, à une portion périphérique, de moyens de fixation au corps 10, comme notamment des orifices destinés à recevoir des vis de fixation. La plaque 28.1 est également pourvue, à une portion centrale, d'une ouverture 28.2. Celle-ci est destinée à permettre à la lumière provenant de la lentille 20 de mise en forme à rencontrer la partie optique du microsystème électromécanique disposé en face de l'ouverture 28.2 en question. L'élément 28 peut à cet effet comprendre des plots 28.3 formant des surfaces d'appui du microsystème électromécanique. Ces plots 28.3, avantageusement au nombre de trois afin d'être isostatiques, forment des surfaces assimilables à des surfaces ponctuelles. Le microsystème électromécanique fixé à la platine à circuit imprimé peut alors être fixée au support de manière à ce que le microsystème électromécanique soit en pression sur les plots 28.3, assurant ainsi un contact et, partant, un positionnement exact suivant la direction perpendiculaire à la face 10.3 du corps 10. Des moyens de positionnement de la platine, suivant le plan de ladite platine, peuvent être prévus, comme notamment des piges traversant des orifices dans la platine et dans le corps 10 au niveau de la face 10.3.To the figure 3 , it can be observed that the support 4 further comprises an element 28, for partially closing the cavity 30, within the body 10. This element 28 is formed by a plate 28.1 provided, at a peripheral portion, with means for fixing to the body 10, such as in particular orifices intended to receive fixing screws. The plate 28.1 is also provided, at a central portion, with an opening 28.2. This is intended to allow the light coming from the shaping lens 20 to encounter the optical part of the microelectromechanical system arranged opposite the opening 28.2 in question. The element 28 may for this purpose comprise pads 28.3 forming bearing surfaces of the microelectromechanical system. These pads 28.3, advantageously three in number in order to be isostatic, form surfaces similar to point surfaces. The microelectromechanical system fixed to the printed circuit board can then be fixed to the support so that the microelectromechanical system is under pressure on the pads 28.3, thus ensuring contact and, therefore, exact positioning in the direction perpendicular to the face 10.3 of the body 10. Means for positioning the board, in the plane of said board, can be provided, such as in particular pins passing through orifices in the board and in the body 10 at the level of the face 10.3.

Toujours à la figure 3 ainsi qu'à la figure 4, on peut observer le diaphragme 24 dans la cavité 30 ainsi que son mode de fixation. La languette 24.1 formant le diaphragme comprend à son extrémité opposée à l'orifice 24.2 deux orifices 24.3 coopérant avec des tiges de positionnement encastrées dans le corps. Elle comprend également un orifice de fixation 24.4 central par rapport aux orifices 24.3 de positionnement, ledit orifice recevant une vis de fixation engageant avec le corps 10. A cet effet, le corps 10 comprend dans la cavité 30 un évidement formant une surface d'appui de la languette 24.1, permettant à celle-ci de passer sous l'élément 28 (suivant le point de vue de la figure 3). Il est intéressant de noter que l'orifice 24.2 est situé à l'extrémité de la languette 24.1 qui est située du côté de la lentille 20 de mise en forme, de manière à éviter toute obstruction du faisceau lumineux se propageant de la lentille 20 de mise en forme vers le microsystème électromécanique. La proximité entre ce faisceau et le bord de la languette 24.1 au niveau de l'orifice 24.2 est visible à la figure 2.Always at the figure 3 as well as to the figure 4 , the diaphragm 24 can be observed in the cavity 30 as well as its method of fixing. The tab 24.1 forming the diaphragm comprises at its end opposite the orifice 24.2 two orifices 24.3 cooperating with positioning rods embedded in the body. It also comprises a fixing orifice 24.4 central relative to the positioning orifices 24.3, said orifice receiving a fixing screw engaging with the body 10. For this purpose, the body 10 comprises in the cavity 30 a recess forming a bearing surface for the tongue 24.1, allowing the latter to pass under the element 28 (according to the point of view of the figure 3 ). It is interesting to note that the orifice 24.2 is located at the end of the tab 24.1 which is located on the side of the shaping lens 20, so as to avoid any obstruction of the light beam propagating from the shaping lens 20 towards the microelectromechanical system. The proximity between this beam and the edge of the tab 24.1 at the orifice 24.2 is visible at the figure 2 .

La figure 4 correspond à la figure 3, où toutefois l'élément 28 est absent. On peut y observer que la première lentille 22.1 du dispositif optique de projection 22 est maintenue en place sur corps 10 au moyen d'une première bride 32. Celle-ci peut présenter un profil ouvert, en l'occurrence en U, avec l'ouverture dirigée vers la lentille 20 de mise en forme. La lentille 20 de mise en forme et la première lentille 22.1 sont en effet très proches l'une de l'autre au point qu'aucune place n'est disponible pour une portion de bride entre les deux lentilles. La première bride 32 est avantageusement fixée au corps 10 par des vis engageant dans des trous filetés pratiqués dans ledit corps.There figure 4 corresponds to the figure 3 , where however the element 28 is absent. It can be seen that the first lens 22.1 of the optical projection device 22 is held in place on the body 10 by means of a first flange 32. This may have an open profile, in this case U-shaped, with the opening directed towards the shaping lens 20. The shaping lens 20 and the first lens 22.1 are in fact very close to each other to the point that no space is available for a portion of flange between the two lenses. The first flange 32 is advantageously fixed to the body 10 by screws engaging in threaded holes made in said body.

La figure 5 est une vue en coupe du dispositif lumineux de la figure 1, la coupe étant suivant un plan longitudinal médian, c'est-à-dire suivant un plan généralement parallèle au plan de la figure 1 et passant au centre du dispositif. Le dispositif en coupe à la figure 5 est représenté sans la platine à circuit imprimé et sans le microsystème électromécanique.There Figure 5 is a sectional view of the light device of the figure 1 , the section being along a median longitudinal plane, that is to say along a plane generally parallel to the plane of the figure 1 and passing through the center of the device. The device in section at the Figure 5 is shown without the printed circuit board and without the microelectromechanical system.

On peut y observer les deux axes optiques 26.1 et 26.2, ainsi que le montage de lentilles. En effet, la lentille 20 de mise en forme comprend deux oreilles de fixation 20.1 et 20.2 (figure 2), ces deux oreilles étant avantageusement diamétralement opposées. Elles sont logées dans des cavités formées dans le corps 10, de manière à assurer une orientation angulaire de la lentille 20 de mise en forme, celle-ci pouvant ne pas être symétrique en révolution. Une deuxième bride 34, en l'occurrence circulaire et fermée, est disposée sur le bord périphérique de la lentille 20 de mise en forme, y compris les oreilles, et est fixée au corps au moyen de vis. Similairement, la deuxième lentille 22.2 du dispositif optique de projection est maintenue en place par une troisième bride 36, également disposée sur le bord périphérique de la deuxième lentille 22.2 et est fixée au corps au moyen de vis.The two optical axes 26.1 and 26.2 can be seen, as well as the lens assembly. In fact, the shaping lens 20 comprises two fixing ears 20.1 and 20.2 ( figure 2 ), these two ears being advantageously diametrically opposed. They are housed in cavities formed in the body 10, so as to ensure an angular orientation of the shaping lens 20, the latter not being able to be symmetrical in revolution. A second flange 34, in this case circular and closed, is arranged on the peripheral edge of the shaping lens 20, including the ears, and is fixed to the body by means of screws. Similarly, the second lens 22.2 of the projection optical device is held in place by a third flange 36, also disposed on the peripheral edge of the second lens 22.2 and is fixed to the body by means of screws.

La lentille 20 de mise en forme et la deuxième lentille 22.2 sont mises en place depuis l'extérieur du corps par insertion dans les zones de réception respectives. La première lentille 22.1 est, quant à elle, mise en place via la cavité 30.The shaping lens 20 and the second lens 22.2 are placed from outside the body by insertion into the respective receiving areas. The first lens 22.1 is, for its part, placed via the cavity 30.

Claims (13)

  1. Luminous device (2), notably for a motor vehicle, comprising:
    - a support (4);
    - a heat sink (12) supporting at least one light source (16) disposed on the support (4):
    - an optical device (20) for forming the light emitted by the light source or sources (16), said device being disposed on the support (4);
    - an electromechanical microsystem (8) with at least one mirror capable of receiving the rays originating from the optical forming device, said microsystem being disposed on the support (4); and
    - an optical projection device (22) capable of receiving the light reflected by the mirror or mirrors of the electromechanical microsystem (8), said device being disposed on the support (4);
    said support (4) comprising a reception zone for the electromechanical microsystem (8)
    said support (4) comprising a body (10) comprising:
    - a reception zone (10.1) for the heat sink (12) supporting at least one light source (16);
    - a reception zone (10.2) for the optical device for forming the light emitted by the light source or sources (16); and
    - a reception zone (10.4) for the optical projection device (22) receiving the rays reflected by the mirror or mirrors of the electromechanical microsystem (8);
    characterized in that
    the body (10) is made of single piece, preferentially of aluminum;
    in that the body (10) forms a cavity (30) with an aperture; and
    in that the support (4) comprises an element (28) formed by a plate (28.1) that can be fixed to the body (10) in order to partially seal the cavity (30),
    the plate (28.1) being provided, a central portion, with an opening (28.2) intended to allow light from the optical device (20) for forming the light to reach the optical part of the electromechanical microsystem (8) which is positioned in front of the said opening (28.2)
    the plate (28.1) comprising an outer surface around said opening (28.2), said outer surface forming the receiving area for the microsystem (8).
  2. Luminous device (2) according to claim 1, characterized in that the cavity (30) is covered with antireflection and/or absorbent coating, preferentially black.
  3. Luminous device (2) according to one of Claims 1 to 2, characterized in that the cavity (30) is delimited by the reception zone (10.2) for the optical forming device and the reception zone (10.4) for the optical projection device (22).
  4. Luminous device (2) according to one of Claims 1 to 3, characterized in that at least one, preferentially each, of the reception zones (10.2, 10.4) for the optical forming device and the optical projection device (22) comprises an orifice formed in the support (4) and a shoulder around said orifice.
  5. Luminous device (2) according to one of Claims 1 to 4, characterized in that it comprises, within the cavity (30), a tongue (24.1) overhanging and with an orifice (24.2) intended to be passed through by the light reflected by the electromechanical microsystem (8) toward the optical projection device (22).
  6. Luminous device (2) according to any of one of preceding claims, characterized in that the light source or sources (16), the optical forming device and the microsystem (8) form a first optical axis (26.1), and said microsystem and the optical projection device (22) form a second optical axis (26.2), the angle between said optical axes lying between 40° and 65°, preferentially between 45° and 60°.
  7. Luminous device (2) according to any of one of preceding claims, characterized in that the light source or sources (16) are of the light-emitting diode type on a board (14) disposed on a heat sink (12) fixed to the reception zone (101) for said light source or sources (16).
  8. Luminous device (2) according to any of one of preceding claims, characterized in that the optical forming device comprises a forming lens (20) which is biconvex and/or the projection device (22) comprises a first lens (22.1) which is biconvex and a second lens (22.2) which is biconcave.
  9. Luminous device (2) according to Claim 8, characterized in that the or each of the lenses (20, 22.1, 22.2) of one or all of the optical forming device or the optical projection device (22) is held in place by a flange (32, 34, 36).
  10. Luminous device (2) according to any of one of preceding claims, characterized in that the optical forming device has a diameter greater than two times, preferentially three times, that of the optical projection device (22).
  11. Luminous device (2) according to any of one of preceding claims, characterized in that the electromechanical microsystem (8) is on a printed circuit board (6), said board being fixed to the support (4) so as to press said microsystem against the reception zone for said microsystem.
  12. Luminous device (2) according to any of one of preceding claims, characterized in that it is a rear signaling light capable of forming pictograms in the light beam produced, said pictograms being a function of a programming of the microsystem.
  13. Luminous device (2) according to any of one of preceding claims, in which the element (28) comprises blocks (28.3) forming bearing surfaces for the electromechanical microsystem (8).
EP17192239.6A 2016-09-28 2017-09-20 Integral mounting for luminous device with micro-mirror array Active EP3301351B1 (en)

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FR1659227A FR3056685B1 (en) 2016-09-28 2016-09-28 MONOBLOC BRACKET FOR LUMINOUS DEVICES WITH MICRO-MIRRORS MATRIX

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CN107869695B (en) 2022-06-24
US10619818B2 (en) 2020-04-14
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FR3056685A1 (en) 2018-03-30
EP3301351A1 (en) 2018-04-04
CN107869695A (en) 2018-04-03

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