• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a light device (1), in particular for a motor vehicle, comprising at least one light source (2) capable of emitting light rays (6) to form a light beam (17) and a projection optical system ( 4) configured to project the light beam (17) along an optical axis (16), characterized in that it further comprises a wavelength conversion element (5) configured to receive the light rays (6) emitted by the light source (2) and for re-emitting light radiation generating said light beam (17) towards the projection optical system (4), and scanning means (3) configured to operate a light ray scan (6). ) emitted by the light source (2) on the conversion element (5), the conversion element (5) having a convex curvature towards the scanning means (3).
    公开号:FR3046659A1
    申请号:FR1650203
    申请日:2016-01-11
    公开日:2017-07-14
    发明作者:Loic Boinet
    申请人:Valeo Vision SA；
    IPC主号:
    专利说明:

    Luminous device provided with a curved wavelength conversion element, and projector comprising such a luminous device.
    The present invention relates to a light device provided with a curved wavelength conversion element, especially for a motor vehicle, and a lighting and / or signaling system provided with such a light device.
    Motor vehicle headlamps are provided with one or more optical modules arranged in an enclosure closed by an ice so as to obtain one or more light beams at the exit of the headlamp. In a simplified way, an optical module of the housing notably comprises a light source, for example one (or more) electroluminescent diode (s), which emits light rays, and an optical system comprising one or more lenses and, optionally an optical element, for example a reflector, for orienting the light rays from the light sources, to form the output light beam of the optical module.
    In addition, other technologies can be used for these devices. Thus, there are laser diodes that can advantageously replace the light emitting diodes. However, the usual lasers are of a color that does not correspond to the regulatory colors of such projectors. The module then has a wavelength conversion element, which receives the light beam from the laser source and re-emits it in white light to a projection optical system and thus forms part of the projector's beam of illumination.
    To illuminate a wider area of the conversion element with a light beam, means for scanning the light beam are necessary. The scanning is performed at a frequency large enough that the human eye does not perceive the movement and sees a continuous illumination of the beam leaving the module.
    The known scanning means are, for example, elements of the MEMS type (for "Micro-Electro-Mechanical-Systems" in English or micromechanical systems), comprising one or more micro-mirrors which reflect the laser beam on the zone. These micro-mirrors are for example animated by at least one rotary movement about an axis which causes the scanning of the zone in a first direction. A second micro-mirror or other rotational movement of the first mirror about a second axis perpendicular to the first axis produces a scan in two directions. The laser beam therefore scans the area.
    The scanning of the beam is effected from one edge to the other of the illuminated area of the conversion element. However, the scan can not have a constant speed across the width of the area. Indeed, the scan must stop at each edge of the area to start in another direction to the other edge. As a result, the illumination re-emitted by the conversion element is not uniform, the illumination of the edge of the illuminated area being more intense than that of the center. However, we rather want to have a beam whose center is brighter than on the sides, to meet the regulations in force. The invention therefore aims to obtain a light device that improves the situation and avoids the aforementioned defects, in particular to obtain a more uniform illumination.
    For this, the invention relates to a light device, especially for a motor vehicle, comprising at least one light source capable of emitting light rays to form a light beam and a projection optical system configured to transmit the light beam along an optical axis. .
    The device is notable in that it further comprises a wavelength conversion element configured to receive the light rays emitted by the light source and to re-emit light radiation generating said light beam towards the projection optical system. , and scanning means configured to scan the light rays emitted by the light source on the conversion element, the conversion element having a convex curvature towards the scanning means.
    Thus, the curvature of the conversion element accentuates the difference in distance between the source of the light beam and the different parts of the conversion element. In other words, the part of the most convex surface of the conversion element is closer to the source than the other parts of the surface. This difference in distance induces a difference in intensity received on the conversion element and transmitted by the latter. With such a conversion element, it is possible to compensate for the lack of luminous intensity in the center with respect to the sides of the beam transmitted by the conversion element. In this way, a beam is obtained which is more homogeneous, or even increases the luminous intensity in the center with respect to the sides.
    According to various embodiments of the invention, which may be taken together or separately: the scanning means are configured to scan the light rays emitted by the light source in a first direction, the conversion element is substantially cylindrical, - the cylindrical shape is defined by a guide curve and a generating line, - the scanning means are configured to scan the light rays on the conversion element in a direction substantially orthogonal to the generating line, - the element of conversion is of substantially paraboloidal shape, or spherical or toric, - the conversion element is of substantially conical shape, - the conversion element is configured so that the wavelength of the re-emitted light radiation is distinct from that of the radii light received to obtain a desired color, - the desired color is for example a light re white. the scanning means are configured to scan the light rays in a second direction; the scanning means are provided with a movable micro-mirror configured to reflect the light rays emitted by the light source so as to scan the light; conversion element in the first direction and / or in the second direction, - the same micro-mirror sweeps the surface of the conversion element by the light rays in both directions, - the scanning means are provided with two micro mirrors configured to scan the light beams respectively in the first direction and in the second direction, the scanning means are arranged in the optical axis of the projection system, the micro-mirror is animated by a movement periodic signal produced by an actuator, - the conversion element is arranged in the optical axis of the projection optical system, - the projection optical system is configured for a curved conversion element; - the projection system has a field curvature substantially corresponding to the curvature of the conversion element; - the conversion element comprises a substrate and a layer of photoluminescent material; the substrate is transparent, the photoluminescent material contains for example phosphorus, or yttrium garnet and aluminum, the light source comprises at least one laser diode. The invention also relates to a lighting and / or signaling system of a motor vehicle comprising such a light device. The system preferably includes power supply means for the light source configured for the light source to emit light rays whose light intensity is constant when energized. The invention will be better understood in the light of the following description which is given for information only and which is not intended to limit it, together with FIG. 1 schematically illustrating a sectional view of profile of an embodiment of a light device according to the invention.
    FIG. 1 represents a light device 1 according to one embodiment of the invention, in particular for a lighting and / or signaling system for a motor vehicle, comprising at least one light source 2 able to emit light rays to form a light beam 6. Here, the light source 2 is for example one or more laser diodes. The light source 2 may also comprise an optical device combining in a single beam several laser rays, for example using optical fibers or devices taking advantage of the different polarizations of different laser sources. The system preferably comprises means for supplying power to the light source 2 configured so that the light source 2 emits light rays 6 whose luminous intensity is constant when it is powered.
    The device 1 comprises a wavelength conversion element 5 configured to receive light rays from the light source 2 and re-emit other light rays whose wavelength is distinct from that of the light rays received. The conversion element 5 makes it possible, for example, to obtain a desired color for the illumination of the headlamp, for example a white light from blue light rays. The conversion element 5 here comprises a transparent substrate 11 and a layer 12 of a photoluminescent material, for example based on phosphorus or yttrium garnet and aluminum (known under the acronym YaG). Thus, the conversion element 5 converts light rays 6 emitted by the light source into a light beam 17 of a color different from that of the rays. The conversion element 5 may, as the case may be, convert only part or most of the light rays emitted by the source 2 to form the light beam 17.
    The device 1 is provided with a projection optical system 4 which serves to collimate the light beam 17 coming from the conversion element and transmit it in a light beam along an optical axis 16 towards the outside of the device 1. For this, the projection optical system 4 is substantially arranged in the optical axis of the conversion element 5.
    The device 1 is further provided with scanning means 3 arranged in the axis of the conversion element 5, on the opposite side with respect to the projection optical system 4. The scanning means 3 receive the light rays 6 from the source 2 and return them to the conversion element 5. Thus, the conversion element 5 is positioned between the scanning means 3 and the projection optical system 4, the light beam 17 being re-emitted by the conversion element 5. The scanning means are configured to perform a scanning of the light beam 6 on the conversion element 5. The scanning is performed at a sufficiently high speed so that the eye does not see the scan and the conversion element transmits a substantially continuous illumination beam for the eye. As illustrated by the arrow 10 in Figure 1, the spokes 6 scan the conversion element 5 between two positions 8 and 9 extreme. The two positions 8 and 9 are preferably chosen to illuminate the ends 14, 15 of the conversion element 5, and thus substantially cover the entire surface of the conversion element 5.
    In a first variant embodiment, the scanning means 3 are, for example, provided with a mobile micro-mirror enabling the conversion element 5 to be scanned by reflection of the light rays 6 towards the conversion element 5. The scanning is carried out in a first direction of the surface of the conversion element 5, which is for example vertical. The micromirror is animated by a periodic movement produced by an actuator (not shown), which uses for example a resonance effect of the micro-mirror caused, for example, by electrodes to make it oscillate. The movement of the micro-mirror, represented by the arrow 7, is operated around an axis of rotation orthogonal to the first direction so that the light rays 6 scan the surface of the conversion element 3 in said first direction.
    In a second variant embodiment, the scanning means 4 are also configured to scan the conversion element 3 with the light rays 6 in a second direction. The second direction is preferably substantially perpendicular to the first direction to produce a movement of the spokes 6 which moves easily on the conversion element 5.
    In other words, it is the same micro-mirror which sweeps the surface of the conversion element 5 with the light rays 6 in both directions. The micromirror therefore follows another movement, for example rotation about a second axis of rotation perpendicular to the previous one. Thus, the micro-mirror makes it possible to scan both horizontally and vertically the conversion element 5.
    A third embodiment, not shown in the figures, is to use a second micro-mirror to scan the light rays in the second direction. In this case, the scanning means are provided with two micromirrors arranged one after the other on the optical path of the beam, each having the function of scanning the conversion element by the light rays, each in one of two directions.
    In the description, the micro-mirrors mentioned as scanning means are for example MEMS (for "Micro-Electro-Mechanical Systems" in English or microelectromechanical systems). However, the invention is not limited to this scanning means and can use other kinds of scanning means such as for example a series of mirrors arranged on a rotary member, the rotation of the element generating a scanning of the conversion element by the light beam.
    According to the invention, the conversion element 5 has a convex curvature towards the scanning means 3. Thus, the central portion 13 of the conversion element 5 is closer to the scanning means 3, and the ends 14, 15 are further away. Thus, the central portion 13 transmits a greater luminous intensity of the light rays 6 than the ends 14, 15. Thus, the light beam 17 reemitted by the conversion element 5 is more intense in the middle than on the sides.
    In addition, the projection optical system 4 is configured for a curved conversion element to provide a more homogenous illumination beam. The projection system has for example a field curvature substantially corresponding to the curvature of the conversion element. For this purpose, it may comprise a plurality of lenses.
    In a first embodiment, the conversion element 5 is substantially cylindrical, the cylindrical shape being defined by a steering curve and a generating line. The scanning means are preferably configured to scan the light rays 6 on the conversion element 5 in a direction substantially orthogonal to the generating line. Thus, the ends 14, 15 remote from the conversion element 5 substantially correspond to the two positions 8, 9 extreme scanning light rays 6. It is therefore preferably used scanning means 3 to a single dimension.
    In a second embodiment, the conversion element 5 is substantially of parabolic or spherical shape. Here, the scanning means 3 preferably print to the light rays 6 a scan in two dimensions. Indeed, in two dimensions, the spokes 6 scan in two directions, and therefore have two pairs of positions, such as 8 and 9, the light beam 6, a pair per scan direction. Such a shape of the conversion element 5 makes it possible to have ends 14, 15 remote from the conversion element 5 for the two pairs of positions.
    权利要求:
    Claims (15)
    [1" id="c-fr-0001]
    CLAIMS:
    1. Light device (1), in particular for a motor vehicle, comprising at least one light source (2) capable of emitting light rays (6) to form a light beam (17) and a projection optical system (4) configured for projecting the light beam (17) along an optical axis (16), characterized in that it further comprises a wavelength conversion element (5) configured to receive the light rays (6) emitted by the source of light (2) and to re-emit light radiation generating said light beam (17) in the direction of the projection optical system (4), and scanning means (3) configured to perform a scanning of the light rays (6) emitted by the light source (2) on the conversion element (5), the conversion element (5) having a convex curvature towards the scanning means (3).
    [2" id="c-fr-0002]
    2. Device according to claim 1, characterized in that the scanning means (3) are configured to scan the light rays (6) emitted by the light source in at least a first direction.
    [3" id="c-fr-0003]
    3. Device according to claim 2, characterized in that the conversion element (5) is substantially cylindrical.
    [4" id="c-fr-0004]
    4. Device according to claim 2, characterized in that the conversion element (5) is substantially paraboloidal shape or spherical or toric.
    [5" id="c-fr-0005]
    5. Device according to claim 2, characterized in that the conversion element (5) is of substantially conical shape.
    [6" id="c-fr-0006]
    6. Device according to any one of claims 2 to 5, characterized in that the scanning means (3) are configured to scan the light rays (6) in a second direction.
    [7" id="c-fr-0007]
    7. Device according to any one of claims 2 to 6, characterized in that the scanning means (3) are provided with a movable micromirror configured to reflect the light rays (6) emitted by the light source so as to scanning the conversion element (5) in the first direction and / or in the second direction.
    [8" id="c-fr-0008]
    8. Device according to claim 6, characterized in that the scanning means (3) are provided with two micro-mirrors configured to scan the light rays (6) respectively in the first direction and in the second direction.
    [9" id="c-fr-0009]
    9. Device according to any one of the preceding claims, characterized in that the scanning means (3) are arranged substantially in the optical axis of the projection system (4).
    [10" id="c-fr-0010]
    10. Device according to any one of the preceding claims, characterized in that the conversion element (5) is arranged substantially in the optical axis (16) of the projection system (4).
    [11" id="c-fr-0011]
    11. Device according to any one of the preceding claims, characterized in that the projection optical system (4) is configured for a curved conversion element (5).
    [12" id="c-fr-0012]
    12. Device according to any one of the preceding claims, characterized in that the conversion element (5) comprises a substrate (11) and a layer of a photoluminescent material (12).
    [13" id="c-fr-0013]
    13. Device according to any one of the preceding claims, characterized in that the light source (2) comprises at least one laser diode.
    [14" id="c-fr-0014]
    14. Lighting and / or signaling system of a motor vehicle comprising a light device (1) according to any one of the preceding claims.
    [15" id="c-fr-0015]
    15. System according to the preceding claim, comprising a power supply means of the light source configured so that the light source emits light rays whose light intensity is constant when it is powered.
    类似技术:
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    FR3075924B1|2019-11-29|BRIGHT BEAM SCANNING LIGHT MODULE, IN PARTICULAR FOR A MOTOR VEHICLE, EQUIPPED WITH A TWO-LENS FOCUSING SYSTEM, AND A LIGHTING DEVICE FOR A MOTOR VEHICLE
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    FR3026824A1|2016-04-08|LUMINOUS DEVICE HAVING LIGHT BEAM FOLDING, IN PARTICULAR FOR MOTOR VEHICLE, AND FIRE PROVIDED WITH SUCH A LUMINOUS DEVICE.
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    同族专利:
    公开号 | 公开日
    EP3190335B1|2018-12-05|
    US20170198876A1|2017-07-13|
    FR3046659B1|2019-11-29|
    EP3190335A1|2017-07-12|
    CN107023790A|2017-08-08|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
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    FR3054642B1|2016-07-29|2020-07-17|Valeo Vision|MOTOR VEHICLE PROJECTOR LIGHTING MODULE WITH VARIABLE OPENING BEAM|
    JP6837776B2|2016-08-10|2021-03-03|株式会社小糸製作所|Vehicle headlights|FR3047542B1|2016-02-08|2020-10-02|Valeo Vision|SCANNING LUMINOUS DEVICE, ESPECIALLY FOR MOTOR VEHICLES, EQUIPPED WITH A LIGHT RAY FOLDING ELEMENT, AND PROJECTOR INCLUDING SUCH LIGHTING DEVICE.|
    DE102018127831A1|2018-11-07|2020-05-07|Schott Ag|Illumination device, preferably with an adjustable or set color location, and their use and method for setting the color location of an illumination device|
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    法律状态:
    2017-01-31| PLFP| Fee payment|Year of fee payment: 2 |
    2017-07-14| PLSC| Publication of the preliminary search report|Effective date: 20170714 |
    2018-01-31| PLFP| Fee payment|Year of fee payment: 3 |
    2019-01-30| PLFP| Fee payment|Year of fee payment: 4 |
    2020-01-31| PLFP| Fee payment|Year of fee payment: 5 |
    2021-01-28| PLFP| Fee payment|Year of fee payment: 6 |
    2022-01-31| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1650203|2016-01-11|
    FR1650203A|FR3046659B1|2016-01-11|2016-01-11|LUMINOUS DEVICE PROVIDED WITH A CURVED WAVE LENGTH CONVERTING ELEMENT, AND PROJECTOR COMPRISING SUCH A LUMINOUS DEVICE|FR1650203A| FR3046659B1|2016-01-11|2016-01-11|LUMINOUS DEVICE PROVIDED WITH A CURVED WAVE LENGTH CONVERTING ELEMENT, AND PROJECTOR COMPRISING SUCH A LUMINOUS DEVICE|
    EP17150337.8A| EP3190335B1|2016-01-11|2017-01-05|Luminous device provided with a curved wavelength conversion element, and headlight comprising such a luminous device|
    US15/402,710| US20170198876A1|2016-01-11|2017-01-10|Lighting device equipped with a curved wavelenght conversion element, and headlight comprising such a lighting device|
    CN201710017570.5A| CN107023790A|2016-01-11|2017-01-10|Lighting device equipped with bending Wavelength changing element and the headlamp including the device|
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