Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
  • B60Q3/00—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors
  • B60Q3/70—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors characterised by the purpose
  • B60Q3/74—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors characterised by the purpose for overall compartment lighting; for overall compartment lighting in combination with specific lighting, e.g. room lamps with reading lamps
  • B60Q3/745—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors characterised by the purpose for overall compartment lighting; for overall compartment lighting in combination with specific lighting, e.g. room lamps with reading lamps using lighting panels or mats, e.g. electro-luminescent panels, LED mats
• • 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]
  • F21S41/155—Surface emitters, e.g. organic light emitting diodes [OLED]
• • 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
  • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
  • F21S41/28—Cover glass
• • 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
  • F21S43/20—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
  • 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
  • F21Y2105/00—Planar light sources
• • 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]
  • F21Y2115/15—Organic light-emitting diodes [OLED]

Definitions

• Motor vehicle optical device comprising a surface source of light
• the present invention relates to an optical device, especially for a motor vehicle, such as a lighting and / or signaling device including a photometric function useful for the road traffic of the vehicle, allowing the vehicle to be seen by d. other vehicles or the driver of the said vehicle to see outside.
• a lighting and / or signaling device including a photometric function useful for the road traffic of the vehicle, allowing the vehicle to be seen by d. other vehicles or the driver of the said vehicle to see outside.
• organic light-emitting diodes also known as OLED or OLED
• OLED organic light-emitting diodes
• these molecules must be protected from water and oxygen molecules, which is achieved with glass slides.
• the OLEDs used to carry out a signaling function therefore comprise a protective glass slide in contact with the emitting layer. Glass slides strongly limit the possible shapes of organic light-emitting diodes.
• OLEDs must therefore have flat surfaces or at the edge of the adjusted surfaces and therefore they can not consist of a screen having any left surface as a running light fixture mirror and / or signaling a motor vehicle. This poses therefore design problems.
• an organic light-emitting diode of current technology typically provides a luminance of 1000 Cd / m 2 whereas to provide the above functions would require a luminance of 5000 to 10 000 Cd / m 2 . Nevertheless, a new organic light-emitting diode technology makes it possible to greatly increase the emission directivity of the diode in the direction perpendicular to its emitting surface.
• the luminance can be increased strongly, for example by a factor of 10 to reach about 10,000 Cd / m 2 .
• an organic light emitting diode of this technology is very directive. Consequently, it has in addition to the disadvantage mentioned above, that of having to be oriented in the longitudinal axis of the vehicle or more generally in the direction towards which it must emit light. This therefore poses design problems, including congestion and design problems.
• Document FR 2 926 677 also discloses an organic electroluminescent diode device emitting a light beam having a high directivity.
• Such an organic light-emitting diode comprises between these two electrodes various layers, in particular a light emitting layer, a layer promoting the transport of electrons to the emitting layer and a layer promoting the transport of holes to the emitting layer. All of these layers constitute a microcavity whose thickness is adjusted to create an optical resonance. It results from such a structure an emission of a beam of light having a high directivity.
• the object of the invention is to provide an optical device for a motor vehicle, in particular a lighting and / or simple signaling device. and compatible with the numerous constraints of size and design which these devices are subjected to.
• An object of the invention is an optical device of a motor vehicle, in particular a signaling and / or lighting device, comprising a surface source of light emitting light rays in a first direction.
• the optical device of a motor vehicle according to the invention comprises an optical system including first optical deflection means at least locally remote from the surface source of light and deviating the light rays emitted in the first direction, in a second direction distinct from the first direction. direction.
• the present invention also makes it possible to overcome the risk of dazzling vehicle drivers when solar rays are reflected on the light source, especially when it is an OLED. Indeed, the sun's rays after having crossed the screen, reflected on the OLED and returned to the screen are sent back in all directions and the risk of glare is practically nil.
• the motor vehicle optical device has a closed enclosure, formed by a housing and a closing window, in which is placed the surface source of light and the optical system.
• It can be a lighting device, such as a projector (also called lighthouse). It may also be a signaling device, such as a vehicle rear light.
• the optical system may comprise second optical means for spreading the light rays.
• Such means make it possible to obtain a desired light distribution of the light rays emitted and to obtain a particular aspect of the optical device of a motor vehicle according to the invention, in particular to fulfill the regulatory photometric specifications while ensuring the best homogeneity.
• the first and / or second optical means may comprise several diopters.
• One or more dioptres may comprise a geometric pattern, and optionally an evolutive geometric pattern, repeating itself spatially.
• the first and second optical means can be confused:
• each pattern individually constituting a means for spreading the light rays, and / or
• the number of parts of the optical system can be limited. Indeed, it is not necessary to provide specific means for spreading the beams after their deflection, this spreading function being provided by the set of deflection means, these deflecting means deflecting the light rays in different directions around from a global direction.
• a first diopter can be made by the inner face of a closure glass closing a housing containing the light source and / or a second diopter can be made by the outer face of the closure glass.
• the number of parts of the optical system can be limited.
• the light source is an organic light emitting diode. Indeed, this technology is now widespread and its cost down.
• the light source has a high emission directivity in the direction perpendicular to its emitting surface, compared to Lambertian light emitting diodes.
• the luminance in a given direction can be greatly increased, for example by a factor of 10.
• the light source has a luminance of at least 5,000 Cd / m 2 , preferably at least 10,000 Cd / m 2 .
• the high directivity of the surface light source is characterized in that the law of light intensity of this source as a function of the emission angle, ⁇ , is a law of the type:
• n being a power varying between 10 and 20.
• the first optical means may comprise one or more diopters.
• the second optical means may comprise one or more diopters.
• the different optical means can be made in a simple manner.
• the emission area of the surface light source is greater than 1 cm 2 .
• this surface may be greater than 10 cm 2 .
• the surface source of light has an area greater than or equal to that of the surface of a relief pattern.
• the surface source may have an area greater than a given percentage than that of the surface of a relief pattern described in the present application. This percentage can be for example at least 10%, 20%, 50%, 75%. Even more preferentially, the area of the surface source is at least twice that of one of these relief patterns.
• the distance between the emission surface of the surface light source and the first optical means and / or the second optical means is at least locally, at least 1 millimeter, or even at least 3 millimeters (3 mm), preferably at least 1 centimeter (1 cm). Even more preferentially, this distance is at least locally at most 40 cm, preferably at most 10 cm. This allows the optical means to follow the curved shapes of the closure glass of the motor vehicle optical device according to the invention, especially when it is a lighting device, such as a projector and / or signaling.
• the first optical means may comprise a diffractive screen and / or the second optical means may comprise a diffractive screen.
• the radii deflected in the second direction make it possible to carry out a signaling function such as: a night vehicle position signaling function, a diurnal signaling function of position of the vehicle, also called DRL function (for Day Running Time in English), a function of signaling change of direction, a function of reversing signaling, braking signaling, a position signaling function in case of fog.
• the optical device of a motor vehicle according to the invention makes it possible, for example, to provide a lighting function of the road, such as a road beam function, a cross-lighting function, a function Fog lighting, According to an alternative embodiment, the optical device of a motor vehicle according to the invention allows for example to provide a lighting function of the passenger compartment.
• the optical device of a motor vehicle according to the invention is arranged to produce an interior decorative light in the passenger compartment of the vehicle.
• the surface source may include a plurality of light-emitting surface elements, including a plurality of organic light-emitting diodes.
• the surface light source preferably comprises an organic light-emitting diode (OLED).
• the surface light source may include a lamp or LED (i.e., a light emitting diode with a small light emitting element dimensions) associated with an optical diffuser, this lamp or this LED being placed behind the optical diffuser arranged to diffuse light from this lamp or this LED.
• a lamp or LED i.e., a light emitting diode with a small light emitting element dimensions
• Another object of the invention is a motor vehicle comprising an optical device defined above.
• Figure 1 is a block diagram of a motor vehicle optical device according to the invention.
• Figure 2 is a partial sectional diagram of a first embodiment of a motor vehicle optical device according to the invention.
• Figure 3 is a partial sectional diagram of a second embodiment of a motor vehicle optical device according to the invention.
• Figure 4 is a partial sectional diagram of a third embodiment of a motor vehicle optical device according to the invention.
• Figure 5 is a partial sectional diagram of a fourth embodiment of a motor vehicle optical device according to the invention.
• Figure 6 is a partial sectional diagram of a fifth embodiment of a motor vehicle optical device according to the invention.
• Figure 7 is a partial sectional diagram of a sixth embodiment of a motor vehicle optical device according to the invention.
• Figure 8 is a partial sectional diagram of a seventh embodiment of a motor vehicle optical device according to the invention.
• Figure 9 is a partial sectional diagram of an eighth embodiment of a motor vehicle optical device according to the invention.
• Fig. 10 is a sectional diagram of an organic light-emitting diode.
• Figure 11 is a graph showing a spreading figure of a light beam obtained by a first method of spreading.
• Fig. 12 is a graph showing a spreading figure of a light beam obtained by a second spreading method.
• Figure 13 is a section of an embodiment of a motor vehicle optical device according to the invention.
• Figure 14 is a section of an embodiment of a motor vehicle optical device according to the invention.
• the principle of the invention is to use, in an optical device of a motor vehicle, a surface source of light, for example an organic light-emitting diode having in particular a high directivity and a high luminance perpendicular to its surface, and of associate it with an optical system placed at a distance from the source.
• the optical system has the function of generally deflecting the light rays emitted by the light-emitting diode, which makes it possible to position the diode in a position that is not necessarily perpendicular to the desired direction of the light rays used for said motor vehicle optical device.
• it also has the function of spreading the rays bright to give the impression that the light source is on the optical system itself and not upstream of it.
• a ray coming from the surface source of light and oriented perpendicular to the surface of this source is deflected by the optical system to be directed outside the motor vehicle optical device in a chosen direction, for example parallel to the longitudinal axis of the motor vehicle.
• the principle of an optical device 1 of a motor vehicle is also described below with reference to FIG.
• the optical vehicle device illustrated in FIG. 1 corresponds to lighting and / or signaling.
• the optical device of a motor vehicle according to the invention can also be, for example, a device from inside the cabin.
• the lighting and / or signaling device mainly comprises:
• a closed enclosure formed by a housing 3 and a closing window 9,
• said optical system is positioned, at least locally, at a distance from the surface source of light.
• the surface source of light When the surface source of light is active, it emits a beam of rays 7 mainly in a first direction 5, for example perpendicular to the surface of the source. This beam of rays is deflected and possibly shaped by the optical system 4.
• the rays 8 thus obtained leave the lighting and / or signaling device through the closure glass 9 and thus provide the lighting function and / or signaling.
• the radii coming out of the lighting and / or signaling device are generally parallel to a second direction 6 chosen according to the illumination and / or signaling function provided.
• the beam formed by the rays 8 may have a greater or lesser spread, that is to say that these rays 8 are inscribed in a cone having an axis parallel to the second direction 6 and having a greater or lesser vertex angle, this angle corresponding to the spreading.
• this cone is not necessarily a revolution. Indeed, for many lighting and / or signaling functions, it is interesting that the section of this cone perpendicular to the direction 6 has a height less than its width.
• the optical system extends over the entire surface facing the surface source of light relative to the main direction of light emission of the surface source.
• each light ray or at least most of the light rays emitted by the surface light source in the main direction of emission are deflected by the optical system so that they exit from the lighting and / or signaling device.
• the apices of the cones resting on the exit points of the radii of the device.
• the first direction and the second direction may form an angle greater than 1 °, preferably greater than 4 °.
• this angle is between 5 and 50 °.
• this angle can be chosen from the following values: 5 °, 10 °, 20 °, 30 °, 45 °.
• the closure glass 403 constitutes the optical system 40. Indeed, it has, on its inner face, a pattern 404 in relief repeating spatially. This inner face forms a first diopter 401. Since the surface of the pattern is not arranged perpendicular to the first direction 5 and is not flat, it deflects the light rays 7 forming a converging beam.
• first optical deflection means deviating the light rays emitted according to the first direction 5 include the dioptres 401 and 402.
• second optical means spreading light rays include the dioptres 401 and 402.
• a closure glass 413 closes the enclosure downstream of an optical system 41.
• this closure glass is devoid of patterns in relief to deflect the light rays.
• the optical system 41 comprises an element 414 of transparent material having, on its inner face, a pattern 415 in relief repeating spatially. This inner face forms a first dioptre 41 1.
• the pattern surface is not arranged perpendicular to the first direction 5 and being non-planar, it deviates the light rays 7 forming a converging beam.
• the light beams are deviated, that is to say that their overall direction has changed, and their shapes are modified, that is to say that the angle of the cone in which their light rays are inscribed is modified.
• the rays thus obtained then leave the transparent element at its outer face forming a second diopter 412 once again deflecting the light rays by accentuating their convergence.
• the light rays then leave the device through the closure glass 413 without being substantially deflected.
• the outgoing rays 8 intersect at a short distance in front of the ice 413, and therefore diverge after crossing each other.
• first optical deflection means deviating light rays emitted according to the first direction 5 comprise the dioptres 41 1 and 412.
• second optical means for spreading the light rays include the diopters 41 1 and 412. This embodiment allows the optical system to have a different shape of the closing ice of the device. Thus, the optical system can be more easily molded and a depth effect can be achieved by removing the optical system from the closure glass.
• the closure glass 424 constitutes the optical system 42. Indeed, the latter has, on its internal face, a pattern 425 in relief with repeating spatially, for example flat prisms. This inner face forms a first diopter 421. The surface the pattern is not arranged perpendicular to the first direction 5, it deflects the light rays 7. In the example, illustrated in Figure 4, the raised pattern 425 of the inner face being a flat prism, the parallel rays remain parallel after deviation.
• the closure glass also has, on its outer face, a pattern 426 in relief repeating spatially. This outer face forms a second diopter 422.
• first optical deflection means deviating the light rays emitted according to the first direction 5 comprise the dioptres 421 and 422.
• second optical means for spreading the light rays comprise the diopters 421 and 422.
• This embodiment makes it possible to separate the deflection and spreading on different diopters.
• the design and the realization, in particular the molding, the optical system are simplified.
• a closure glass 435 closes the enclosure downstream of an optical system 43.
• the optical system 43 comprises an element 434 made of transparent material presenting on its inner face, a relief pattern 435 repeating spatially, for example planar prisms.
• This inner face forms a first dioptre 431. Since the pattern surface is not arranged perpendicular to the first direction 5, it deflects the light rays 7.
• the relief pattern 425 of the inner face being a flat prism, the parallel rays remain parallel after deflection. The rays thus obtained then leave the transparent element at its outer face having a pattern 436 in relief repeating spatially. This outer face forms a second diopter 432.
• first optical deflection means deviating the light rays emitted according to the first direction 5 comprise the dioptres 431 and 432.
• second optical means for spreading the light rays comprise the dioptres 431 and 432.
• This embodiment makes it possible to prevent the clogging of the optical system 43 by dust from outside and being housed in the concave areas of the screen. Thus the photometric efficiency is guaranteed in all circumstances.
• the closure glass 446 constitutes an element of the optical system 44. Upstream of the closure glass is a first element 445 of the optical system. This element is made of transparent material. It comprises, on its inner face, a pattern 447 in relief repeating spatially. This inner face forms a first dioptre 441.
• the surface of the pattern Since the surface of the pattern is not perpendicular to the rays 7, it deflects the light rays. The light rays are then again deviated by the outer face of the first element which forms a second diopter 442.
• the closure glass has on its inner face, a pattern 448 in relief repeating spatially. This inner face forms a third diopter 443.
• the surface of the pattern being non-planar, it spreads the light rays forming a divergent beam.
• the rays thus obtained then leave the ice at its outer face forming a fourth diopter 444 again deflecting the light rays.
• the rays 8 of the light beam finally obtained are generally parallel to the second direction 6.
• first optical deflection means deviating the light rays emitted in the first direction 5 include the diopters 441 and 442.
• second optical means for spreading the light rays comprise the diopters 443 and 444. This embodiment makes it possible to separate the deflection and spreading functions. The more or less free positioning of the diopter 445 with respect to the diopter 446 makes it possible to create a depth effect.
• the closure glass 456 constitutes an element of the optical system 45.
• a first element 455 of the optical system Upstream of the closure glass is a first element 455 of the optical system.
• This element is made of transparent material. It includes an inner face smooth forming a first diopter 451 and, on its outer face, a pattern 457 in relief repeating spatially. This outer face forms a second diopter 452. This dioptre deflects the light rays.
• the closure glass has on its inner face, a pattern 458 in relief repeating spatially. This inner face forms a third diopter 453. The surface of the pattern being non-planar, it spreads the light rays forming a divergent beam.
• first optical deflection means deviating the light rays emitted in the first direction 5 include the diopters 451 and 452.
• second optical means spreading light rays include the dioptres 453 and 454. This embodiment is particularly interesting because it has a good performance by limiting losses by reflection of light rays on the diopters.
• the closure crystal 467 is disposed downstream of the optical system 46.
• the optical system comprises a first element 465 and a second element 466. These elements are made of transparent material.
• the first element comprises a smooth inner face forming a first dioptre 461 and, on its outer face, a pattern 467 in relief repeating spatially. This outer face forms a second diopter 462. This dioptre deflects the light rays.
• the dioptres 461 and 462 form prisms.
• the second element 466 presents, on its inner face, a pattern 468 in relief repeating spatially. This inner face forms a third diopter 463.
• first optical deflection means deviating the light beams emitted in the first direction 5 include the dioptres 461 and 462.
• second optical means spreading light rays include the dioptres 463 and 464.
• this geometric pattern can be scalable, that is to say that its optical characteristics evolve progressively according to its position in the optical system.
• optical characteristics in particular light ray direction characteristics, desired and possibly different at different points of the closure glass.
• Patterns 463, 453, and 443 may also be convergent, so as to converge the rays at a small distance, thereby spreading the beam in a manner similar to that obtained with divergent patterns when viewed at distance.
• the motor vehicle optical device comprises two surface light sources 21, 22. These two sources can be arranged side by side. They can emit light mainly in two distinct directions 51, 52.
• the optical system 4 makes it possible to deflect and shape the beams of light rays emitted by each of the two sources.
• the beams of light rays thus obtained may be generally oriented in the same direction 6.
• the light beams from the first source 21 may be deflected globally in a first direction and the light beams from the second source 22 may be deflected overall according to a second direction, these first and second directions being distinct.
• the portion of the optical system facing the first light source may have different optical characteristics of the portion of the optical system facing the second light source.
• the variations in characteristics may be progressive to avoid any sudden change in appearance of the motor vehicle optics.
• FIG. 9 by taking two light sources emitting perpendicularly to their surface, these can be arranged, whether joined or not, by orienting their transmission plane differently.
• the optical system 4 will make it possible to give the desired overall direction to the beam coming from each independent source. It is thus possible to overcome the orientation constraints of the surface source.
• the arrangement of the surface sources can be performed according to the design of the optical device of a motor vehicle according to the invention, and particularly when it is a lighting and / or signaling device, for example to follow his curve.
• the optical system will then be adapted to provide the overall direction and desired spread of the light beams.
• Such an embodiment also makes it possible to give an unlit aspect different from the lit aspect, the surface of the surface source, for example the organic light-emitting diode, not being perceived similarly according to whether it is on or off, especially when it emits strongly director.
• the first and second light sources emit light of different colors and can be activated independently of one another.
• the optical device of a motor vehicle can perform several functions, including several functions requiring different colors, the device nevertheless having a homogeneous appearance from outside the closing window when the light sources are extinguished.
• the device can provide both a back position signaling function and a direction change signaling function.
• the same optical device of a motor vehicle according to the invention may also have more than two surface light sources, for example to perform more than two functions or to follow more closely the curve, particularly in the case of a lighting device and / or signaling.
• FIG. 1 1 corresponds to a screen on which is projected the light beam of the lighting and / or signaling device. This screen is in principle vertical, the axis V corresponding to the axis of the vertical and the axis H to the horizon.
• each light beam as elementary as it is, including each light beam impacting the whole of a basic pattern of a first diopter providing a spreading function, is spread.
• the same spreading effect is obtained differently as shown in Figure 12. Indeed, there is no spreading of each elementary beam.
• the spreading function is obtained by deviations of the elementary beams in different directions around the second direction 6. There is thus strictly speaking only means for deflecting the light rays, the means for spreading the light rays being constituted by all means of deviation.
• An example of a diffusion figure or a spreading figure is shown in FIG. 12. This example of a figure is shown schematically in rectangular form 80, nevertheless the figure may have any other shape.
• an elementary light beam in particular a light beam impacting the whole of a basic pattern of a first diopter providing a spreading function, is not spread.
• a set of light beams (whose sections 80 are shown in FIG. 12) are obtained from the elementary patterns and oriented in different directions.
• the non complete and shifted superimposition of the different light spots in a distributed manner over the entire spreading zone of the beam 80 makes it possible to generate the overall beam.
• an organic light-emitting diode device 60 is shown in FIG. 10.
• the device comprises an organic electroluminescent diode 62 and an electrical voltage generator 61.
• the organic light-emitting diode comprises several layers: a cathode 63, an anode 65 and an organic layer 64.
• the organic layer When the organic layer is subjected to an electrical voltage, it emits light radiation 66 propagating through the anode 65 which is transparent. relative to this radiation.
• the organic layer may optionally comprise different layers 641 to 645 of different organic materials. Preferably, organic light-emitting diodes comprising additional layers are used.
• the organic layer comprises a stratum 641 promoting the transport of electrons to the stratum 643 and a stratum 645 favoring the transport of the holes, ie absences of electrons, up to the emitting layer 643.
• the organic layer may also comprise a stratum 642 blocking the holes from the lower strata, 643 to 645, and a stratum 644 blocking the electrons from the upper strata 641 to 643.
• All of these strata constitutes a microcavity whose thickness is adjusted to create an optical resonance.
• selective interferential reflectors are made which constitute resonant cavities.
• an organic light-emitting diode of the type described in document FR 2 926 677 mentioned above can be used.
• the emitting area of the surface light sources is greater than 1 cm 2 , or even greater than 10 cm 2 .
• the patterns of the diopters typically have sizes of between 0.5 mm and 1 mm. mm or even between 0.2 mm and 5 mm, or even up to 10 mm.
• the optical system of the motor vehicle optical device may comprise one or more diffractive screens. Indeed, these screens have the properties of being able to collimate, straighten or spread the light with structures whose size is of the order of the wavelength of light. Some optical diffraction properties are preponderant with respect to the refractive properties.
• screens may comprise diffraction gratings comprising patterns of a size close to the wavelength behaving together as a prism whose deflection angle depends on the wavelength and the geometry of these wavelengths. networks.
• the first optical means for deflecting the light rays are at least locally distant from the surface source of light.
• the optical system 4 comprising the first optical means is curved and remote from the surface light source 2 in the central part of the section shown, even if at the ends of the section shown, the optical system is in contact with the surface source.
• the optical system 4 is curved and remote from the surface light source 2 at the ends of the section shown, even though, in the central part of the section shown, the optical system is in contact with the surface source.
• the area of the surface source is equal to that of several relief patterns, for example three, or even more than ten.
• the advantage of the surface source, especially in the case of an OLED, is that it can extend over a large area.
• the surface light source may extend in relation to a plurality of patterns of the first optical means, or even of all the patterns of the first optical means.
• the surface source of light may be flat and may not necessarily be oriented in the direction in which the light rays are expected to propagate out of the device.
• the implantation of a surface source of light in an optical device of a motor vehicle, and particularly in a lighting and / or signaling device is simplified.
• the surface source of light can be positioned according to the average curve of the closure glass of the lighting and / or signaling device. It is thus possible to use organic electroluminescent diodes with high luminance without suffering unacceptable constraints of positioning thereof.
• the spreading effect of the optical system makes it possible to solve the reflection problems posed by the presence of a light-emitting diode without an optical system.

Landscapes

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=42313284

Family Applications (1)

Country Status (5)

Families Citing this family (10)

Citations (4)

Family Cites Families (7)

• 2010
  • 2010-01-26 FR FR1050504A patent/FR2955643B1/fr active Active
• 2011
  • 2011-01-10 CN CN201180007209.5A patent/CN102725583B/zh active Active
  • 2011-01-10 US US13/574,911 patent/US8840290B2/en active Active
  • 2011-01-10 EP EP11700064A patent/EP2529151A1/de active Pending
  • 2011-01-10 WO PCT/EP2011/050235 patent/WO2011092052A1/fr active Application Filing

Patent Citations (4)

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events