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    • 专利摘要:
    The lighting device (1) for vehicle has two light sources and a device (2) for converting wavelength excited by the combination of the radiation from the two light sources (11, 12). A first light source (11) is associated with a scanning system (3) scanning a first light radiation onto a first conversion region (R1) of the device (2), while a second light source (14, 15) emits a second light radiation into a second conversion region of the device (2). The second source, different from the first source and whose luminance level is typically lower, is provided with electroluminescent rods (15) of submillimeter dimensions. The beams (W1, W2) produced by the device (2) respectively in the first region (R1) and in the second region have different characteristics and complement one another to perform one or more lighting functions.
    公开号:FR3061538A1
    申请号:FR1750015
    申请日:2017-01-02
    公开日:2018-07-06
    发明作者:Pierre Albou
    申请人:Valeo Vision SA；
    IPC主号:
    专利说明:

    Holder (s): folded.
    VALEO VISION Joint-stock company simO Extension request (s):
    Agent (s):
    VALEO VISION Limited company.
    ® LIGHTING DEVICE FOR A VEHICLE, COMBINING TWO LIGHT SOURCES.
    FR 3,061,538 - A1
    @) The lighting device (1) for a vehicle has two light sources and a device (2) for wavelength conversion excited by the combination of radiation from the two light sources (11, 12). A first light source (11) is associated with a scanning system (3) projecting by scanning a first light radiation on a first region (R1) of conversion of the device (2), while a second light source (14, 15) semiconductor emits a second light radiation in a second conversion region of the device (2). The second source, different from the first source and whose luminance level is typically lower, is provided with light-emitting rods (15) of submillimetric dimensions. The beams (W1, W2) produced by the device (2) respectively in the first region (R1) and in the second region have different characteristics and complement each other to achieve one or more lighting functions.

    i
    Lighting device for a vehicle, combining two light sources
    The present invention relates to a light device, making it possible to perform a lighting function for a vehicle. More particularly, the invention relates to a lighting device for a vehicle (typically a motor vehicle), comprising:
    - a wavelength conversion device (typically comprising converter crystals or similar converter solids distributed in a layer of the conversion device, or dye molecules dispersed in the layer);
    - a first light source emitting a first light radiation;
    - a scanning system receiving the first light radiation and projecting it by scanning on a first conversion region defined by the wavelength conversion device.
    Patent application US20140029282 A from VALEO VISION describes an example of such a lighting device, in which the light source is either a single laser source, for example a laser diode whose wavelength can correspond to a color ranging from blue to near ultraviolet, an optical device combining in a single beam several laser radiations, for example using optical fibers or devices taking advantage of the different polarizations of different laser sources.
    The wavelength conversion device, of the phosphor plate type, receives the laser beam by means of the scanning system and emits radiation in the visible direction in a determined general direction. The phosphor plate can be located in the immediate vicinity of the focal plane of an optical imaging system, which then infinitely forms an image of the phosphor plate, or more exactly of the points or sectors of this plate (points or sectors typically defined by converter crystals or other generally solid chemical elements having the required property) which emit white light in response to the laser excitation which they receive. The wave converting device has an output face, facing the optical imaging system. The distribution of the crystals or solid chemical converting elements is homogeneous in the conversion layer of the phosphor plate. The expression “phosphor plate” designates a structure including at least one layer of a material based on different chemical elements having the required wavelength conversion property.
    To obtain in practice a complete beam which satisfies the regulations for lighting of the code type, it is necessary to have a significant power (several tens of Watt) for the laser source and therefore, it is necessary to multiply the electromechanical microsystems (MEMS) mirrors, which increases the cost of the lighting device. Indeed, without distribution and at the maximum power required, an existing microsystem would be destroyed by the radiation from the laser source.
    In addition, it would be difficult to multiply the laser sources since it is very complicated to combine the beams of different laser diodes so as to have a sufficiently small beam diameter both at the level of the scanning system and of the length conversion device. wave.
    The invention therefore aims to obtain a luminous device which brings new possibilities of arrangement and design of a light, and compatible with a good compromise between lighting performance and reliability.
    To this end, the invention relates to a lighting device of the aforementioned type for a vehicle, in particular for lighting (typically front lighting) of a motor vehicle, which has:
    - a second light source, distinct from the first source, which emits a second light radiation and which includes:
    - a semiconductor light source, comprising light-emitting sticks of submillimetric dimensions, knowing that the wavelength conversion device is designed and arranged to emit (in the same determined general direction):
    a first light beam from the interaction, at the level of the first conversion region, of the first light radiation with the wavelength conversion device, and
    - a second light beam from the interaction, at a second conversion region of the wavelength conversion device, of the second light radiation with the wavelength conversion device.
    Preferably, the luminance of the first light ray is greater than the luminance of the second light ray.
    Thanks to these provisions, it is possible to combine the performance advantages linked to the use of a light source typically having a high luminance and the advantages of a moderate basic lighting obtained without recourse to a scanning system, this moderate lighting resulting from the conversion of radiation from a semiconductor light source, by operating a common conversion device with two beams.
    The second light source’s electroluminescent sticks, thanks to their submillimetric dimension, allow a pixelation effect of the lighting, with possibilities of improved control of the beam. In particular, the semiconductor light source can be controlled to adjust the intensity of the luminosity emitted by the conversion device, for example by obtaining a maximum situated in the range from 60 lux to 100 lux. This advantageously makes it possible to reduce the heating of the phosphor plate.
    The semiconductor light source advantageously has control possibilities which do not require a scanning system as for a laser source or equivalent light source and is less expensive to produce, at equivalent power, than a laser diode (for example a blue laser emission diode).
    According to one feature, the first conversion region has a characteristic dimension, typically an equivalent diameter or diameter, which is reduced relative to the dimensions (length and width, or external diameter if applicable) of the conversion layer of the conversion device. The ratio between the area of the scanning system actually used for projection to the conversion device and the receiving area of the first region can thus be reduced, even when using a very miniaturized system (MEMS type), which reduces the stresses on the microsystem enabling scanning. In addition, the use of one or more laser sources scanned over a small area makes it possible to achieve very high luminances without requiring as much power as would be required by scanning the entire length conversion device. wave (first and second regions).
    Concerning the second conversion region, this is wider than the first region so that the second beam is comparatively wider than the first beam. It is understood, in fact, that the first beam which results from the interaction with the first light radiation leaves the conversion device with a diameter (or equivalent diameter) reduced compared to the second beam. This results from the use of a common projection optic.
    According to one feature, the wavelength conversion device:
    - extends in one piece from a first face to a second face (which is preferably substantially parallel to the first face), and
    - Is suitable for emitting in a determined general direction, through the first face, the first light beam and the second light beam.
    It is understood that the first conversion region and the second conversion region extend between these two faces, and typically belong to the same conversion layer.
    According to one option, the light radiation projected by the scanning system reaches the wavelength conversion device through the first face of the conversion device. In this case, a reflection layer of this light radiation can be provided in the conversion device, on the side of the second face.
    Optionally, the reflection layer can selectively reflect the first radiation, while allowing the second light radiation to pass if the second light source is placed against the second face or placed opposite this second face.
    Optionally, the reflection layer can reflect the entire visible spectrum, with the exception of the second light radiation if the second light source is placed against the second face or placed opposite this second face.
    An interconnection layer, which is preferably configured to allow to selectively ignite all or part of the light-emitting sticks, can make it possible to activate the light emissions of the light-emitting sticks by forming sub-zones or pixels, such sub-zones being able to present a variable size and luminance. Control of the second light source by means of such an interconnection layer makes it possible to select different lighting configurations for the light-emitting sticks. It is allowed to modify a size and / or a luminance of the second light beam by modifying the ignition configuration of the light-emitting sticks.
    When the second light source is facing the first face, the reflection layer can be formed by a mirror which, optionally, can serve as a support for the wavelength conversion device.
    According to another option, the light radiation projected by the scanning system reaches the wavelength conversion device through the second face of the conversion device. If the light radiation coming from the light-emitting sticks of the second light source reaches the wavelength conversion device by its first face, a reflection layer can be provided to selectively reflect this second radiation, while allowing the first to pass radiation.
    According to one feature, the luminance of the second light radiation can be made non-homogeneous. The luminance can thus be increased locally by accentuating the density of light-emitting rods in a sub-zone considered. A homogeneous radiation mode can be provided by default (heterogeneous mode being an option triggered according to lighting needs).
    Advantageously, the combination of the first light source and second light source with a phosphor plate placed behind an optical imaging system (including a projection lens whose exit pupil has a diameter of 40 mm or more) makes it possible to carry out the code function, and optionally:
    the road function, the curve following function (better known by the acronym DBL "Dynamic Bending Light" in English), both in code and en route, the correction of range without movement of the lighting module;
    a beam of bad weather (generally known with the acronym AWL for "Adverse Weather Light");
    a fog beam (then exclusive of the code, which is regulatory); and the glare-free road function (this is known as the ADB “Adaptive Driving Beam” function in English).
    It should be emphasized that the scanning system associated with the first source (typically a laser diode) facilitates curve tracking and can vary, if necessary, the perimeter of the first conversion region (region receiving in practice more radiation strong luminance, taking into account the different nature of the first light source). This variation of the scanned perimeter can be activated in particular for needs related to bad weather or to the fast driving of the vehicle carrying the lighting device (for example on motorway or when it is detected that the vehicle is traveling faster than a determined threshold). , for example more than 110 km / h).
    A lighting device according to the invention may include one or more of the following characteristics:
    the second light radiation resulting from the emissions of the light-emitting rods has a wavelength which is offset from the wavelength of the first light radiation, the difference being for example greater than or equal to 20 nm (with this arrangement, it is permissible to easily achieve security with respect to a laser source or similar source of high luminance, by placing this first source on the side of the first face and by selectively absorbing the first radiation emitted from this first source by a absorption layer of the wavelength of the first radiation, for example located in the imaging optics; this avoids, in the event of damage to the phosphor plate, that laser light can be reflected directly outwards) ;
    - when the second light radiation resulting from the emissions of the light-emitting rods has at least two characteristic wavelengths, each of the characteristic wavelengths is offset from the wavelength of the first light radiation, the difference being for example greater than or equal to 20 nm;
    - the conversion layer of the wavelength conversion device has a variety of chemical elements making it possible to convert into white light radiation having different wavelengths, which are located in the visible range and are preferably shorter or equal to 500 nm.
    - The first light source is a laser light source and that the first light radiation is laser radiation.
    - laser radiation has a wavelength between 400 nm and 500 nm.
    - the second light source is configured to have a luminance of between 30 Cd / mm 2 and 50 Cd / mm 2 .
    - The second light source comprises at least two selectively activatable zones.
    - the at least two zones are configured so as to have a different luminance relative to one another.
    - the at least two zones are configured so as to have a different size relative to each other, and a different number of light-emitting sticks of submillimetric dimensions.
    - the second light radiation emitted by the second light source is of a wavelength less than or equal to 500 nm.
    - the wavelength of the second light radiation is controlled as a function of the wavelength of the first light radiation.
    - the second light source is attached to the wavelength conversion device by means of an absorbent layer, the absorbent layer being made of a material suitable for absorbing the first light radiation.
    - An optical system is provided for receiving the first and second light beams emitted by the wavelength conversion device, the optical system comprising at least one diopter with a diameter greater than or equal to 40 mm and / or at least one diopter allowing the lighting device to function as a code light.
    - The second light source is adapted to emit, directly or indirectly, the second light radiation to the first conversion region.
    - the scanning of the first light radiation on the first conversion region is carried out at variable speed.
    the first conversion region and the second conversion region are collocated in the same conversion layer of the wavelength conversion device, the conversion layer preferably being based on at least one material including the phosphor.
    - the wavelength conversion device comprises a wavelength conversion layer deposited on a layer of a substrate based on a material chosen from materials that are good thermal conductors.
    Other characteristics and advantages of the invention will appear during the following description of several of its embodiments, given by way of nonlimiting examples, with reference to the attached drawings in which:
    - Figure 1 is a schematic view of a lighting device according to a first embodiment of the invention;
    - Figure 2 is a schematic sectional view illustrating a wavelength conversion device usable for receiving the emissions of the first light source and the second light source;
    - Figure 3 is a similar view of Figure 1, illustrating a lighting device according to a second embodiment of the invention;
    - Figure 4 illustrates a variant positioning of the wavelength conversion device, usable in a third embodiment of the invention;
    - Figure 5 illustrates a front view showing an example of a second light source which has different areas with light emitting sticks.
    In the different figures, the same references designate identical or similar elements.
    Figures 1 and 2 show a first embodiment of a lighting device 1 which may be part of a motor vehicle light, for example a front light. The lighting device 1 can be installed in a sealed housing and at least partly surrounded by an external envelope of the vehicle. In a manner known per se, the light can have a closing glass (not shown) through which the light rays of the outgoing beam F can pass.
    Here, the lighting device 1 comprises two light sources 11 and 12 associated with the same wavelength conversion device 2. The supply of these two light sources 11, 12 is of the electrical type and of a kind known per se. Generally in all that follows, the electrical supply of the components of the lighting device 1 is not shown, this in order not to unnecessarily burden the figures.
    The scanning system 3 shown in FIG. 1 is designed to intercept the first light radiation emitted by the first light source 11 and to reflect this light radiation L by reflection to a face (non-absorbent and typically transparent), here a first face F1, of the wavelength conversion device 2. The first light source 11 is typically a laser source comprising for example a laser diode. In a manner known per se, an optical imaging system 4 is placed between the wavelength conversion device 2 and the glass, in order to transmit an outgoing beam F in a determined direction. Such an optical imaging system 4 is provided with at least diopter 5 or equivalent device defining an exit pupil whose diameter is greater than or equal to 40 mm. It is understood that the optical system 4 makes it possible to fulfill at least the code function.
    The first light source 11 also comprises conventional optical focusing means 6 and makes it possible to emit laser radiation whose wavelength is between 400 nanometers and 500 nanometers, and preferably close to 450 or 460 nanometers. These wavelengths correspond to colors ranging from blue to near ultraviolet. The scanning system 3, of conventional type, comprises in the example described a single micro-mirror, movable around two orthogonal axes.
    With reference to FIG. 1, the laser type light radiation L is reflected by the micro-mirror to a first region R1 of conversion of the wavelength conversion device 2. The radiation specific to this length conversion device d wave 2 is transmitted to the optical imaging system 4.
    With reference to FIG. 2, the first conversion region R1 may correspond to a small area which is central in the conversion layer 21 formed in the wavelength conversion device 2. The conversion layer 21 covers a layer of substrate 16 which here has a reflecting effect for light radiation L of the laser type, at least at a central zone adjacent to the first conversion region R1.
    In a preferred embodiment, the wavelength conversion device 2 is deposited on a substrate chosen from materials that are good thermal conductors. The substrate layer 16 can thus dissipate heating in the first region R1 of conversion. As illustrated in FIG. 1, this first region R1 is crossed by the optical axis X of the optical imaging device 4.
    The wavelength conversion device 2 extends in one piece from the first face F1 to a second face F2 substantially parallel to the first face F1, so that it has a plate format. The first face F1 here constitutes a single external face through which all the useful radiation of the wavelength conversion device 2 can be transferred, in a determined general direction.
    In this first embodiment, the scanning system 3 and the optical imaging system 4 are arranged on the same side, which corresponds to the reflection side of the substrate layer 16. On this same side, the substrate layer 16 can be covered with a continuous and homogeneous layer forming the conversion layer 21. This forms a phosphor plate. In the conversion layer, at least one material M with phosphorescent (or possibly fluorescent) property is present. In known manner, each point of this conversion layer 21 receiving the laser radiation L (here this monochromatic and coherent radiation is received in the first conversion region R1), re-emits light W1 of length d towards the optical imaging system 4 different wave, and in particular a light which can be considered as “white”, that is to say which comprises a plurality of wavelengths between approximately 400 nanometers and 800 nanometers, that is to say included in the spectrum of visible light. This light emission occurs, according to a Lambertian emission diagram, that is to say with uniform luminance in all directions.
    As clearly visible in FIG. 2, the conversion layer 21 has a region R2 of conversion which is more extensive than the first region R1 and which includes the first region R1 more central. This region R2 can correspond to all or part of the conversion layer 21. In the embodiment illustrated in FIG. 1, the conversion layer 21 also interacts with a second light radiation which passes through (from the rear) the second face F2 of the wavelength conversion device 2.
    This second light radiation, of lower luminance, than the first light radiation coming from the first light source 11, is generated by a semiconductor light source (14, 15) which has a plurality of light-emitting rods 15 of submillimetric dimensions. Each of these light-emitting rods 15 extends in a wired fashion from a common surface. The light source (14, 15) is defined by a chip or similar optoelectronic device, for example substantially of the same kind as the device described in document WO 2016/001200. The optoelectronic device can comprise groups of light-emitting rods 15 each associated with a control circuit.
    With reference to FIG. 5, light-emitting rods 15 are divided into several groups corresponding to zones 23a, 23b, 23c and 24a, 24b, 24c of the second light source 12. These zones 23a, 23b, 23c and 24a, 24b, 24c can be activated selectively. It is allowed, for example, to illuminate in different modes, for example and without limitation:
    - all zones except for lower zones 23a, 24a;
    - all zones except upper zones 23c, 24c;
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    - all the zones located on the same side (right or left), that is to say either zones 23a to 23c, or zones 24a to 24c;
    - only intermediate zones 23b and 24b.
    More generally, the second light source provides flexibility in adjusting the lighting zones, and makes it possible to divide these zones in the manner of pixels. Of course, the largest dimension (side if it is a square format, diameter if it is a round format) of the second light source is then greater than 5 mm and typically greater than or equal at 10 mm. It is understood that this control makes it possible to adjust with more finesse the image projected to infinity by the optical imaging system 4 and / or the desired luminance for the outgoing beam F.
    At least some of the zones 23a, 23b, 23c and 24a, 24b, 24c are optionally configured so as to have a different luminance relative to one another. As an example, the second light source 12 has at least two zones which are configured so as to have:
    - one size different from the other, and
    - a different number of light-emitting rods 15 of submillimetric dimensions.
    The structure with light-emitting rods 15 makes it possible to obtain a very high light extraction efficiency. The second light radiation emitted by the second light source 12 is for example of a wavelength less than or equal to 500 nm (while preferably remaining greater than, equal to or slightly less than 400 nm), which makes it possible to interact optimally with the conversion layer 21.
    Referring to Figures 1 and 2, the optoelectronic device here forming the second light source 12 can emit blue or UV light from an output face which is oriented towards a second region R2 of conversion of the wavelength conversion device 2 The first region R1 can be contained in this second region R2 of conversion. In other words, the conversion layer 21 of the wavelength conversion device 2 is locally lit by the combination of the first light radiation and the second light radiation. In the example of FIG. 1, the second light source 12 directly emits the second light radiation towards the conversion layer 21, in the general direction determined, so that it reaches all of the first conversion region R1.
    The conversion layer 21 based on luminophore material (often phosphorescent) can then be considered as a source of secondary radiation, consisting of a light image (resulting here from the combination of the first light radiation and the second light radiation), the optical imaging system 4 forms an image at infinity, for example on a screen placed at a distance in the X axis of the optical system 4 and perpendicular to this axis.
    The second light source 12 is here placed behind the wavelength conversion device 2 which is, for example, in the form of a thin plate or lamina of phosphor (for example with ceramic substrate of the zerodur® type, having a large thermal stability).
    The density of light-emitting rods 15 is adjusted to obtain a moderate luminance, of the order of 30 to 50 Cd / mm 2 ; sufficient to obtain a maximum intensity of the order of 60 Ix to 100 Ix on the axis at 25m, reducing heating of the wavelength conversion device 2. A cooling module 30 is typically provided to reduce heating in the conversion layer 21 where the white light is generated. An air flow is generated here by the cooling module. Alternatively, heat exchange can be achieved by using a liquid material and / or a phase change material.
    A phosphor layer can also be formed directly on the second light source 12. In this option, the light-emitting rods 15 are advantageously encapsulated in a conversion layer 21 (consisting of phosphors encapsulated in a silicone polymer). We can then consider that the substrate layer 16 is the silicon substrate (good thermal conductor) of the second light source 12 (silicon substrate which is then behind the light-emitting sticks 15). This substrate can be coated with a reflective layer (aluminum anode for example).
    If the wavelength of the two respective light sources 11 and 12 is sufficiently different, a safety function can be ensured by stopping the wavelength of the laser with a notch filter located for example in the optical system 4. This does not 'does not prevent the obtaining of white light; for a blue laser application, the necessary blue component can be supplied by the second light source 12 with light-emitting rods 15.
    In a preferred embodiment, an interface, for example in the form of an interconnection layer, makes it possible to produce lighting by pixels, each pixel being associated with a defined number of light-emitting sticks 15 of the optoelectronic device. It is thus possible to control the shape and intensity of the white light beam W2 from the second conversion region R2.
    By way of nonlimiting example, the lighting device 1 performs a lighting light function for a motor vehicle, in particular a code function. Where appropriate, pixels can be formed, the size and luminance of which vary according to the areas addressed at the second light source 12. Optionally, a maximum can be obtained for luminances by variations in column density.
    In the first embodiment, it is understood that the second light radiation has a wavelength sufficiently different from the wavelength of the laser radiation L, so that the substrate layer 16 which has a reflecting or absorbing effect for the radiation laser L, can pass the second light radiation. Here, the second light source 12 is attached to the wavelength conversion device 2 via the substrate layer 16.
    In a preferred option, the wavelength of the second light radiation can be chosen so as, for example, to differ sufficiently from the wavelength of the first light radiation.
    The fact of producing two beams of white light W1 and W2 by a common conversion layer 21 of the same wavelength conversion device 2 allows access to a wide variety of functions without risk of deterioration or destruction of the system scanning 3, because the power required for the first light source 11 remains much lower than what is required, for example for a code lighting function, when a single laser source is used.
    The light beam F emerging from the optical imaging system 4 is a direct function of the light rays (in white light) emitted by the conversion layer 21, which are themselves a function:
    - laser radiation L which scans this layer 21 at the level of the first conversion region R1; and
    - radiation from light emitting sticks 15.
    A control unit (not shown) can control the various components 3 and 11 producing the laser radiation L, as well as the light radiation produced by the light-emitting rods 15, according to the desired photometry of the outgoing beam F. In particular, the control simultaneously controls the scanning system 3 and the first light source 11, so that the associated radiation, here the laser radiation L, successively scans points of the first conversion region R1. The amplitude of the scanning can be adjusted if necessary to concentrate the radiation on certain points of the first region R1 of conversion (the light trace defined by the laser radiation L can have a shape of point, of wider spot, even a mark oblong). The intensity of the laser radiation L can be adjusted by this control.
    Simultaneously, in particular for the code function and other functions used while driving the vehicle, the control unit can activate a selection of the zones 23a, 23b, 23c, 24a, 24b, 24c of the second light source 12 and / or adjust the luminance corresponding to each of these zones.
    Thus, it is allowed with the same light of the motor vehicle to obtain the position light function (front light in this case), with an outgoing beam F which defines a larger lighting surface, when the weather conditions allow it , and as a fog light (typically applicable to a rear light) with a more intense outgoing beam F which defines a reduced lighting surface, when the weather conditions are more difficult, with intense rain or fog for example.
    In an option, not shown in the figures, a system for modifying the function of the light is connected to the lighting device 1. This modifying system can be controlled using a vehicle computer as a function of parameters of conduct. Alternatively or in addition, this modification system is controlled by a manual control which can be actuated from the passenger compartment of the vehicle by the driver. In this case, it is the driver who chooses when to change the light function.
    When laser radiation L is generated through the first light source 11, the lighting device 1 can be associated with a security module which has failure detection means. Thus, in the event of a failure of the wavelength conversion conversion device 2 or of the scanning system 3, it is possible to automatically cut or reduce the luminance (by interposing a dispersive material or a suitable filter for example ) from the laser source.
    An advantage of combining a wavelength conversion device 2 by covering a light source with light-emitting rods is, as in the case illustrated in FIG. 1 corresponding to the first embodiment, of being able to use a second source which can be compact and directly attached to the conversion layer 21. With this type of solution, there is no need to add to the wavelength conversion device a specific projection optic for the second light source 12.
    A second embodiment of the lighting device 1 will now be described with reference to FIG. 3.
    The lighting device 1 shown in FIG. 3 differs from the first embodiment essentially in that the positions of the second light source 12 and of the scanning system 3 are different. The structure of the scanning system 3, the optical imaging system 4 and the sources 11 and 12 may remain the same. The first light source 11 is of the laser type and the wavelength of the first light radiation is significantly different from the wavelength of the light-emitting rods 15 of the second light source 12. The difference is such that the thermal drifts, in the range of use, are insufficient to make up the difference in wavelength.
    Here, the scanning system 3 is optionally positioned behind the conversion layer 21, while the second light source 12 is located on the side of the first face F1. The wavelength conversion device 2 then differs in that it has a base layer which allows the laser radiation L to pass to reach the conversion layer 21. A layer which disperses this laser radiation L can be provided on the side of the first face F1. In addition, provision may be made to reflect the second light radiation by a reflecting surface, at least in the region or regions peripheral to the central zone traversed by the laser radiation L. In this case compatible with FIG. 3, a projection optic (not shown) is located between the second source 12 and the first face F1. Since the emission of the light-emitting rods 15 is not directional, it is understood that it is preferable to orient the radiation from the second light source 12 by an intermediate optical device before reaching the wavelength conversion device. 2. It is then also possible to obtain a pixelation of the second light source 12 thanks to the intermediate optics.
    Due to the use of an intermediate optical device, it is advantageously permitted to use a source 12 of size (in particular smaller circumference) significantly smaller than the conversion layer 21, which constitutes an economic advantage.
    According to the needs, it is also possible to involve several optoelectronic devices each emitting a second light radiation which pass through the first face to excite the material M with phosphorescent property (phosphor) in the conversion layer 21. It is understood that the length conversion device wave then allows to combine two beams of white light W1 and W2.
    In an alternative embodiment, when both the scanning system 3 and the second light source 12 are opposite the first face F1, the wavelength conversion device 2 can have a reflection layer (for example in the form of a mirror) which is an integral part of the wavelength conversion device 2 or can serve as a support for this wavelength device 2. A third embodiment of the lighting device 1 will now be described with reference to FIG. 4.
    The lighting device 1 shown in FIG. 4 differs from the first embodiment essentially in that the positions of the second light source 12 and of the scanning system 3 are different. The structure of the scanning system 3 and of the sources 11 and 12 can remain the same. The optical imaging system and the optional cooling module are not shown for the sake of simplification. The first light source 11 is of the laser type. The wavelength of the first light radiation is significantly different from the wavelength of the light emitted by the light-emitting rods 15 belonging to the second light source 12.
    More particularly here, the scanning system 3 is optionally positioned behind the wavelength conversion device 2 to project the first light radiation towards the first conversion region, while the second light source 12 indirectly emits the second light radiation to the second conversion region, via a mirror 32, a prism or any other optical projection system.
    The wavelength conversion device 2 typically differs in that it does not have a bottom layer or has a bottom layer allowing the respective radiation to pass through the second face F2 to reach the conversion layer 21. When the first light source 11 is a laser diode or similar source of laser radiation, for example a layer is provided which reflects this laser radiation, on the side of the first face F1 in the direction of the face F2.
    In this example, heating of the phosphor plate of the wavelength conversion device 2 can be dissipated on both sides (first side F1 and second side F2), using for example external layers based on a chosen material. among good thermally conductive materials.
    The arrangement illustrated in FIG. 4 makes it possible to use a second light source 12 of size significantly smaller than the size of the conversion layer 21 (and therefore economical), an optical projection device (for example the mirror 32) making it possible to '' enlarge the image of this source 12 to the size of the region R2.
    According to the needs, it is also possible to involve several optoelectronic devices which each emit a second light radiation passing through the second face F2 to excite the material M in different places of the conversion layer 21. In this option, it is possible if necessary to provide an arrangement, contiguous or not with respect to the second face F2, of the optoelectronic devices around a central passage provided for laser radiation. This makes it possible to position the scanning system 3 further back than one or more of the optoelectronic devices. However, for reasons of cost and size, it is generally preferable to use a second light source 12 formed in one piece.
    It is understood that the wavelength conversion device 2 then makes it possible to combine two beams of white light W1 and W2, as in the embodiments previously described. These beams W1 and W2, produced by the wavelength conversion device 2 respectively in the first conversion region R1 and in the second conversion region R2 have different characteristics and complement each other to achieve one or more lighting functions .
    It should be obvious to those skilled in the art that the present invention allows embodiments in many other specific forms without departing from the scope of the invention as claimed.
    Thus, although the scanning system 3 has been presented as being fast enough to scan a single first region R1 of the wavelength conversion device 2, it is understood that this scanning system 3 can also, alternatively or in addition, scan point areas or subregions that are spaced from each other.
    Also, although the second light source 12 has been illustrated in the drawings as having a single semiconductor light source provided with light-emitting rods 15 and of relatively large dimensions (of the order of a centimeter for example), it is understood that the light source 12 can have at least two semiconductor units each provided with light-emitting rods 15 designed separately and grouped in the lighting device 1 to form the second light radiation which is received by the wavelength conversion device 2.
    The illustrated arrangements are nonlimiting and the lighting device can have other arrangements. For example, in a variant not illustrated in the figures, the first light source 11 of the laser type, the second light source 12 and the optical system 4 can be placed on the same side relative to the wavelength conversion device 2 (fairly similar to the case of FIG. 3 but with the laser radiation L coming from the other side).
    权利要求:
    Claims (17)
    [1" id="c-fr-0001]
    1. Lighting device (1) for a vehicle comprising:
    a wavelength conversion device (2);
    a first light source (11) emitting a first light radiation;
    a scanning system (3) receiving the first light radiation and projecting it by scanning on a first conversion region (R1) of the wavelength conversion device;
    a second light source (12) emitting a second light radiation and which includes:
    - a semiconductor light source (14, 15) comprising light-emitting rods (15) of submillimetric dimensions, in which the wavelength conversion device (2) is capable of emitting:
    a first light beam (W1) from the interaction, at the first conversion region (R1), of the first light radiation with the wavelength conversion device, and a second light beam (W2) at from the interaction, at a second region (R2) of conversion of said wavelength conversion device, of the second light radiation with the wavelength conversion device.
    [2" id="c-fr-0002]
    2. Device according to claim 1 or 2, characterized in that the device (2) for wavelength conversion extends in one piece from a first face (F1) to a second face (F2) substantially parallel to the first face (F1), and is adapted to emit in a determined general direction, through the first face (F1), the first light beam (W1) and the second light beam (W2).
    [3" id="c-fr-0003]
    3. Device according to any one of the preceding claims, characterized in that the first light source (11) is a laser light source and that the first light radiation is laser radiation (L).
    [4" id="c-fr-0004]
    4. Device according to claim 3, characterized in that the laser radiation (L) has a wavelength between 400 nm and 500 nm.
    [5" id="c-fr-0005]
    5. Device according to any one of the preceding claims, characterized in that the second light source (12) is configured to have a luminance of between 30 Cd / mm 2 and 50 Cd / mm 2 .
    [6" id="c-fr-0006]
    6. Device according to any one of the preceding claims, characterized in that the second light source (12) comprises at least two zones (23a, 23b, 23c, 24a, 24b, 24c) selectively activatable.
    [7" id="c-fr-0007]
    7. Device according to claim 6, characterized in that the at least two zones (23a, 23b, 23c, 24a, 24b, 24c) are configured so as to have a different luminance relative to one another.
    [8" id="c-fr-0008]
    8. Device according to claim 7, characterized in that the at least two zones (23a, 23b, 23c, 24a, 24b, 24c) are configured so as to have:
    a different size from each other, and a different number of light-emitting sticks (15) of submillimetric dimensions.
    [9" id="c-fr-0009]
    9. Device according to any one of the preceding claims, characterized in that the second light radiation emitted by the second light source (12) is of a wavelength less than or equal to 500 nm.
    [10" id="c-fr-0010]
    10. Device according to any one of the preceding claims, characterized in that the wavelength of the second light radiation is controlled as a function of the wavelength of the first light radiation.
    [11" id="c-fr-0011]
    11. Device according to any one of the preceding claims, characterized in that the second light source (12) is attached to the device (2) for wavelength conversion by means of an absorbent layer, the absorbent layer being made of a material suitable for absorbing the first light radiation.
    [12" id="c-fr-0012]
    12. Device according to any one of the preceding claims, characterized in that it comprises an optical system (4) receiving the first and second light beams emitted by the wavelength conversion device (2), the optical system (4) comprising at least one diopter (5) allowing the lighting device to function as a code light.
    [13" id="c-fr-0013]
    13. Device according to any one of the preceding claims, characterized in that the second light source (12) is adapted to emit, directly or indirectly, the second light radiation towards the first conversion region (R1).
    [14" id="c-fr-0014]
    14. Device according to any one of the preceding claims, characterized in that the scanning of the first light radiation on the first region (R1) of conversion is carried out at variable speed.
    [15" id="c-fr-0015]
    15. Device according to any one of the preceding claims, characterized in that the first conversion region (R1) and the second conversion region (R2) are collocated in the same conversion layer (21) of the length conversion device wave, the conversion layer (21) preferably being based on at least one solid material (M) including the phosphor.
    [16" id="c-fr-0016]
    16. Device according to any one of the preceding claims, characterized in that the device (2) for wavelength conversion comprises a conversion layer (21) of wavelength (21) deposited on a layer (16) of a substrate based on a material chosen from materials which are thermally conductive.
    [17" id="c-fr-0017]
    17. Device according to any one of the preceding claims, in which the light-emitting rods (15) are, at least for part of them, selectively activatable by means of an interconnection layer, so that there are several configurations for lighting the light-emitting sticks (15), a size and / or a luminance of the second light beam (W2) being modifiable by modifying the configuration for lighting the light-emitting sticks (15).
    1/2
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    同族专利:
    公开号 | 公开日
    US20180187852A1|2018-07-05|
    EP3342638A1|2018-07-04|
    CN108266696B|2022-02-25|
    FR3061538B1|2019-05-24|
    EP3342638B1|2019-07-31|
    CN108266696A|2018-07-10|
    US10591129B2|2020-03-17|
    引用文献:
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    FR3008477A1|2013-07-10|2015-01-16|Koito Mfg Co Ltd|LAMP FOR VEHICLE|
    KR20160107774A|2015-03-05|2016-09-19|엘지이노텍 주식회사|Lamp device and automobile lamp using the same|
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    DE102010028949A1|2010-05-12|2011-11-17|Osram Gesellschaft mit beschränkter Haftung|headlight module|
    JP2012059454A|2010-09-07|2012-03-22|Sharp Corp|Light emitting device, lighting system, and headlamp for vehicle|
    JP5656290B2|2011-03-18|2015-01-21|スタンレー電気株式会社|Semiconductor light emitting device|
    CN202257010U|2011-04-12|2012-05-30|骆庆疆|Projective optical engine with light source mixing laser and LED |
    FR2993831B1|2012-07-27|2015-07-03|Valeo Vision|ADAPTIVE LIGHTING SYSTEM FOR MOTOR VEHICLE|
    FR3010486B1|2013-09-10|2018-01-05|Valeo Vision|LIGHTING MODULE FOR VEHICLE|
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    KR101836845B1|2016-07-04|2018-03-09|엘지전자 주식회사|Lighting device for vehicle|
    JP6817569B2|2016-07-29|2021-01-20|パナソニックＩｐマネジメント株式会社|Light emitting device and lighting device|WO2020024595A1|2018-08-01|2020-02-06|深圳市绎立锐光科技开发有限公司|Light source device and headlight system|
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    法律状态:
    2018-01-31| PLFP| Fee payment|Year of fee payment: 2 |
    2018-07-06| PLSC| Publication of the preliminary search report|Effective date: 20180706 |
    2020-01-31| PLFP| Fee payment|Year of fee payment: 4 |
    2021-01-28| PLFP| Fee payment|Year of fee payment: 5 |
    2022-01-31| PLFP| Fee payment|Year of fee payment: 6 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1750015|2017-01-02|
    FR1750015A|FR3061538B1|2017-01-02|2017-01-02|LIGHTING DEVICE FOR A VEHICLE COMBINING TWO LIGHT SOURCES|FR1750015A| FR3061538B1|2017-01-02|2017-01-02|LIGHTING DEVICE FOR A VEHICLE COMBINING TWO LIGHT SOURCES|
    EP17209936.8A| EP3342638B1|2017-01-02|2017-12-22|Lighting device for a vehicle, combining two light sources|
    CN201711479303.6A| CN108266696B|2017-01-02|2017-12-29|Lighting device for vehicle combining two light sources|
    US15/857,675| US10591129B2|2017-01-02|2017-12-29|Lighting device for a vehicle, combining two light sources|
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