• 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 present invention relates to a lighting system (10) which comprises a light source (12) capable of producing a light beam (L), and static means (14) for scanning the light beam comprising at least one deflection body (18) of the beam path. The static scanning means (14) and the light beam (L) further comprise optical means (28) for amplifying the deflection of the trajectory of the light beam, placed downstream of the deflection body (18) by considering the direction of propagation of the light beam (L).
    公开号:FR3029265A1
    申请号:FR1461589
    申请日:2014-11-27
    公开日:2016-06-03
    发明作者:Jean-Claude Puente；Pierre Albou；Vincent Godbillon
    申请人:Valeo Vision SA；
    IPC主号:
    专利说明:

    [0001] The present invention relates to the technical field of lighting systems for a motor vehicle. More particularly, the invention relates to a lighting system forming a projector for a motor vehicle. A motor vehicle headlamp has the main function of lighting the road, and includes various optical systems and light sources. It is known to operate a projector in two modes. 10 The first mode, commonly known as the "low beam", produces a slightly downward deviation to illuminate the road in front of the vehicle for about 50 meters and not to dazzle any motorists who may be driving around. in the opposite direction on an adjacent track. In this mode of operation, the driver is able to better perceive the environment at close range if he is traveling at night or in difficult weather conditions (fog, snow, rain). The second mode of operation, commonly referred to as "high beam", produces a high intensity light towards the front of the vehicle and considerably increases the driver's field of vision, especially at night and in case of snow or rain. On the other hand, the orientation of the light beam is likely in this case to dazzle drivers traveling in the opposite direction on an adjacent lane or traveling in front on the same lane, which is why it is necessary to switch to low beam as soon as possible. that this situation presents itself. It is also known to provide an additional mode of operation of the projector said ADB (or Adaptive Driving Beam) or "selective beam" producing a lighting of the "high beam" partially masked to avoid the lighting of areas where oncoming vehicles or vehicles in front are present. This avoids the glare of other drivers while maintaining a large field of vision. Reference can be made to EP-2 415 638 for more details on the ADB mode of operation. In this latter mode of operation, the "selective beam" is produced by projecting a light image formed by scanning a light radiation. To obtain an image of satisfactory size, it is necessary to perform scanning on an angular sector of either large angle or large radius. In the latter case (large radius) the optical path is relatively long so that the means for producing the image 35 to be projected are relatively bulky. In view of the ever-increasing congestion constraints at the front of a vehicle, it is therefore preferred to hold the scanning on an angular sector of significant angle, rather than large radius. The scanning must therefore cover an angular sector which is sufficiently large, for example of the order of 15 °, in order to create a sufficiently large luminous image. Light beam deflection devices comprising, for example, electro-optical, acousto-optical or mechano-optical means are already known in the state of the art. Some of these means have the advantage of being static, which limits their wear compared to dynamic means. Thus we already know in the state of the art static means for scanning a light beam having at least one deflection body of the path of the light beam and control means of the deflection body. However, all these devices can deflect a beam at most 10 of 2 °. In particular, those skilled in the art are dissuaded from using static means of deflection because of the low angle of deflection they provide. EP-2690352 proposes to remedy this problem by means of a scanning system comprising articulated micromirrors capable of scanning a light beam over a satisfactory angular sector. However, this system raises several problems. Indeed, micro-mirrors are mechanically fragile because they are subject to vibrations and shocks that can disrupt their axes of articulation or break them. In addition, they are thermally fragile because their reflection coefficient is not strictly equal to 100% (it is generally of the order of 90 to 99%). The micro-mirrors must therefore absorb part of the energy transported by the light beam and their low heat capacity (implied by their low volume) therefore generates a significant increase in temperature that can damage them. Moreover, because the mirrors travel micro-displacements, they are subjected to fatigue constraints deteriorating progressively. Finally, the control of such a micro-mirror system is relatively complex. The object of the invention is to provide a lighting system provided with scanning means forming an image intended to be projected, these scanning means covering a sufficiently large angular sector, and this with simple, static and robust means. For this purpose, the invention provides a lighting system for a motor vehicle, comprising: a light source capable of producing a light beam, and static means for scanning the light beam comprising at least one deflection body the path of the light beam and the steering means of the deflection body, characterized in that the static scanning means further comprise optical means for amplifying the deflection of the path of the light beam, placed downstream of the body deviation considering the direction of propagation of the light beam. Thus, the static means for scanning the light beam make it possible to cover an angular sector of the order of 2 °, and the optical amplification means make it possible to amplify it in order to reach a satisfactory angular sector angle. The means for adjusting the deflection are static, so that they undergo no fatigue stress. The elements involved in the deflection of the light beam being the deflection body, the steering means of the deflection body and the optical amplification means, it is clear that this lighting system is more robust and simpler design than the one of the prior art comprising micro-mirrors. According to a first embodiment, the deflection body is a reflecting body 10 capable of reflecting the light beam, and the steering means of the deflection body comprise means for generating a stationary pressure wave in the reflecting body, this wave being frequency controllable to scan the light beam. A diffraction grating thus appears on the surface of the reflective body, the pitch of which is controlled by the stationary pressure wave, which is frequency-controlled. The control of the step 15 makes it possible to control a scanning of the light beam. Advantageously, the reflective body has a reflective surface of the light beam forming a diffraction grating. The pitch of the existing diffraction grating is thus varied by means of the stationary pressure wave generated by the steering means of the deflection body. According to another embodiment, the deflection body is a transparent body, traversed by the light beam, and the steering means of the deflection body comprise means for generating a stationary pressure wave in the transparent body, this wave being frequency controllable to scan the light beam. Thus, the stationary pressure wave causes the transparent body to lose the uniformity of its refractive index, which then has local minima and local maxima corresponding to the nodes and bellies of the stationary pressure wave. The periodic non-uniformity of the refractive index in the transparent body causes a deviation of the light beam. Controlling the frequency of the stationary pressure wave makes it possible to control the position of the nodes and the bellies of the wave, and thus to control a scanning of the light beam. According to another embodiment, the deflection body is a transparent refractive body of the light beam, for example a prism, and the steering means of the deflection body comprise means for generating a variable electric field in the transparent body. of refraction. Controlling the variation of the electric field in the transparent body makes it possible to vary the refractive index in the transparent body, and thus to control a scanning of the light beam. Advantageously, the Kerr constant of the transparent refraction body is greater than 1.10-12 m.V-2. The variation of the refractive index of the transparent refraction body, caused by the variation of the electric field in the transparent body, by the Kerr effect is thus particularly important. Advantageously, the transparent refractive body is a crystal belonging to the trigonal, tetrahedral, hexagonal, triclinic, monoclinic or orthorhombic crystalline system. The transparent body is then birefringent, and the variation of the refractive index of the medium, generated by the variation of the electric field in the transparent body, is also done by Pockels effect. According to one embodiment, the optical means for amplifying the deflection of the trajectory of the light beam comprise a convex mirror, for example cylindrical or spherical. According to another embodiment, the optical means for amplifying the deflection of the trajectory of the light beam comprise a lens, preferably divergent. These optical means make it possible to simply and efficiently amplify the scanning of the light beam by the deflection body in order to reach a satisfactory angular sector angle. Advantageously, the lighting system further comprises means for absorbing the light beam for absorbing the light beam when the deflection body is in a predetermined rest position. According to the invention there is also provided a method for securing a lighting system, characterized in that the lighting system is as defined above and in that when the control means of the body of deflection are disabled, the deflection body is placed in its rest position. Thus, when the deflection body is in its rest position, the absorption means absorb the light beam so as to avoid deterioration of the lighting system by heating. Advantageously, the lighting system further comprises means for controlling the light source. According to the invention there is also provided a method for making a lighting system safe, characterized in that the lighting system is as defined above and in that, when the control means of the deflection body are deactivated, the light source is deactivated using the control means of this light source. This prevents the deterioration of the lighting system by heating in the case in particular where the control means are inadvertently deactivated. The invention will be better understood on reading the following description given solely by way of example and with reference to the drawings in which: FIG. 1 is a schematic view of a lighting system according to a first embodiment of the invention, - Figures 2 to 4 are views of a lighting system similar to that of Figure 1 according to second to fourth embodiments, - Figure 5 is a simplified view of a lighting system according to the invention, and - Figure 6 is an enlarged view of the absorption means of the lighting system of Figure 1.
    [0002] With reference to FIG. 1, a lighting system 10 for a motor vehicle, according to a first embodiment of the invention, comprises a conventional light source 12. This comprises, for example, a laser diode (not shown) emitting a substantially monochromatic light beam L. Static means 14 for scanning the light beam are placed on the path of the light beam L. These static scanning means 14 comprise a fixed support 16, secured to other optical elements of the lighting system 10, in particular the light source 12, and a deflection body 18 fixed to this support 16. The deflection body 18 is here formed by a metal bar, the The reflection coefficient is close to 1, so that the optical power loss of the light beam L by absorption in the bar is as low as possible. The inclination of the deflection body 18 allows the light beam L to be deflected by means of a reflective lateral surface of the deflection body 18. The reflecting body 18 is connected to the support 16 via an absorber 20 placed between a 18A end of the reflective body 18 and the support 16. It will be seen in the following that the orientation of the reflecting body 18 and the absorber 20 are interesting for the operation of the lighting system 10. The static scanning means 14 also include a deformable body 22 placed in contact with the other end 18B of the reflective body 18. The deformable body 22 is in this case a conventional piezoelectric transducer, consisting for example of quartz. The reflecting body 18 is thus interposed between the absorber 20 and the deformable body 22 by being in contact with its respective ends 18A and 18B with this absorber 20 and this body 22 Steering means 24 of the deflection body 18 are connected to the transducer These means 24 make it possible to control the current delivered to the piezoelectric transducer 22 by a power source (not shown), for example the battery of the vehicle in which the lighting system 10 is mounted. control means 24 of the deflection body 18 are deactivated, that is to say when they drive the delivery of a zero current to the piezoelectric transducer 22, the deflection body 18 occupies a predetermined position called rest. Second driving means 26 are connected to the light source 12 and the control means 24. When the latter are deactivated, so that the deflection body 18 occupies its rest position, the second control means 26 detect this setting. in the rest position and deactivate the light source 12. The lighting system 10 is thus secured. The static scanning means 14 also comprise optical means 28 for amplifying the deflection of the path of the light beam L, placed downstream of the deflection body 18 by considering the direction of propagation of the light beam L. These optical means 28 of FIG. amplification are here formed by a cylindrical convex mirror 29, but it can be provided, alternatively that they are formed by a convex mirror spherical or by a lens, preferably divergent. These means 28 allow to deflect a second time the light beam L emitted by the light source 12. As an embodiment, the cylindrical mirror 29 may have a radius of curvature of 25 millimeters. It will be seen in the following that the geometric properties of optical amplification means 28 are interesting for the use that is made of them. Conventional absorption means 30 are placed on the optical path of the light beam L, downstream of the static scanning means 14. These absorption means 30 are positioned to absorb the light beam L when the deflection body 18 is in its rest position, the light beam L not meeting the absorption means 30 when the control means 24 drive the current delivered to the piezoelectric transducer 22. This avoids any risk of damage, caused for example by a heating of the elements of the lighting system 10 in the event of failure of the control means 24 and prolonged exposure of these elements to the light beam L. As an exemplary embodiment, and with reference to FIG. 6, these absorption means 30 comprise a box 300 having a cavity 301 and an opening 302. The walls of the cavity are covered with an absorbent coating 303, for example a black matt paint di fugitive or anodizing. When the deflection body 18 is in its rest position, the spoke L enters the cavity through the opening 302. It impacts the wall of the bottom of the box 300 and is essentially absorbed by the coating 303. The low proportion of light The reflective film is diffused into the box 300 where it is itself essentially absorbed by the absorbent coating 303. Only a tiny proportion of the light is likely to come out through the opening 302. The operation of the lighting system 10 will now be described. The light source 12 emits a monochromatic light beam L in the direction of the static scanning means 14. In particular, the light beam L is reflected by the deflection body 18. The control means 24 control the current delivered to the piezoelectric transducer 22 to generate an oscillating deformation. By thus deforming, the piezoelectric transducer 22 transmits a stationary pressure wave 5 to the reflecting body 18. The latter being interposed between, on the one hand, the piezoelectric transducer 22 subjected to oscillating deformations, and on the other hand, absorber 20 fixed to the support 16, the pressure wave causes the formation of a diffraction grating on the reflective lateral surface of the deflection body 18, the pitch of which is equal to the spatial period of the stationary pressure wave, i.e. the space between successive belly 10 and node of the stationary pressure wave. The pitch of the diffraction grating is thus a function of the frequency of the pressure wave. Since the diffraction angle is a function of the pitch of the diffraction grating, the control means 24 of the deflection body 18 are thus means for generating a stationary pressure wave in the deflection body 18, this wave being adjustable in frequency 15 to scan the light beam L. With reference to FIG. 5, the light beam L is scanned in a first non-zero angular sector a by diffraction on the reflecting body 18, the diffraction angle being controlled by the control of the frequency of the stationary pressure wave by the control means 24. As an exemplary embodiment, using a conventional piezoelectric transducer 22 and conventional control means 24, the angle α of the first angular sector is equal to order of 1.50. The light beam L then propagates to the cylindrical mirror 29. The curvature of the latter has the effect of amplifying the light beam deviation L, which is then scanned on a second angular sector p. With a cylindrical mirror 29 with a radius of curvature of 25 millimeters and a distance traversed by the light beam L between the reflecting body 18 in the rest position and the cylindrical mirror 29 of the order of 35 millimeters, the angle [3 of the second angular sector is of the order of 15 °. The light beam L then propagates to a wavelength conversion device (not shown) known per se, comprising for example phosphorus. The latter then forms a white light image resulting from the scanning of the monochromatic light beam L. The light image is then projected by projection means (not shown) known per se to emit light to a space to be illuminated. In order to ensure the safety of the lighting system 10 with regard in particular to unforeseeable operating incidents, when the control means 24 are deactivated, the deflection body 18 is placed in its rest position and the source is deactivated. light 12 using the control means 26 of this light source 12. In the following, other embodiments of the lighting system 10 according to the invention will be described with reference to FIGS. 4. In these Figures 2 to 4, the elements similar to Figures 1 and 5 are designated by identical references. FIG. 2 illustrates a second embodiment of the lighting system 10 according to the invention, which differs from the first embodiment in that the deflection body 18 is a reflecting body comprising a reflecting surface 32 of the light beam forming a diffraction grating. The stationary pressure wave then has the effect of modifying the pitch of this existing diffraction grating so as to modify the diffraction angle of the light beam. The light beam L is then scanned by the static scanning means 14. FIG. 3 illustrates a third embodiment of the lighting system 10 according to the invention, which differs from the embodiments presented above in that the body deflection 18 is a body this time transparent, crossed by the light beam L. The control means 24 of the deflection body 18 always comprise means for generating a stationary pressure wave in the transparent body, this wave being controllable in frequency to scan the light beam L. The stationary pressure wave causes the transparent body 18 to lose uniformity of its refractive index, which then has local minima and local maxima corresponding to the nodes and the bellies of the wave. stationary pressure. The non-uniformity of the refractive index in the transparent body 18 causes a continuous controlled refraction of the light beam L propagating in the transparent body 18. The control of the frequency makes it possible to control the position of the nodes and the bellies of the wave, and thus to control a scanning of the light beam L. In this embodiment, the optical amplification means 28 of the deflection of the light beam are a divergent lens 34, and the absorber 20 constitutes the means of absorption 30. It can nevertheless be provided that the lighting system 10 comprises absorption means 30 which are distinct from the absorber 20. FIG. 4 illustrates a fourth embodiment of the lighting system 10 according to FIG. invention, differing from other embodiments in that the deflection body 18 30 is a transparent refractive body of the light beam, in this case a prism, and in that the control means 24 of the horn Deviation ps include conventional means for generating a variable electric field in the transparent refractive body. Controlling the intensity of the electric field created in the transparent refraction body 18 makes it possible to modify the refractive index by the Kerr effect, and oscillations of the intensity of the electric field cause a scanning of the refracted light beam. In order for this change in index to be significant, so as to obtain a scan covering an angular sector of angle of the order of 1 °, the transparent refractive body 18 has a Kerr constant greater than 1.10-12 mV. -2. As an exemplary embodiment, the transparent refractive body 18 may consist of a glass cell comprising nitrobenzene, whose Kerr constant is approximately 4.4 × 10 -12 mV-2. It is also possible for the transparent refractive body 18 to be a crystal belonging to the trigonal, tetrahedral, hexagonal, triclinic, monoclinic or orthorhombic crystalline system, so that the transparent refractive body 18 is birefringent. The control of the intensity of the electric field created in the transparent refraction body 18 thus also modifies its refractive index by the Pockels effect, so as to accentuate the refraction of the light beam L and to accentuate the angle of the scanned angular sector. As an exemplary embodiment, the transparent refractive body 18 may comprise lithium niobate, whose crystal structure is trigonal. Of course, we can bring to the invention many changes without departing from the scope thereof. It can be provided that the control of the light beam comprises a feedback loop so as to make the operation of the lighting system more reliable. In each embodiment, it is possible to choose optical amplification means consisting of either a convex, cylindrical or spherical mirror or a convergent or divergent lens. It can be provided that the optical means for amplifying the deflection of the trajectory 20 of the light beam comprise a concave mirror which will have the advantage of reversing the images for example between the right and the left of the beam. One can also provide to use the same control program of the first control means for a left projector and for a right projector of the motor vehicle. It can be provided that the absorption means simply consist of a wall 25 covered with a black matte paint, especially when they are separate from the absorber.
    权利要求:
    Claims (13)
    [0001]
    REVENDICATIONS1. Lighting system (10) for a motor vehicle, comprising - a light source (12) capable of producing a light beam (L), and - static means (14) for scanning the light beam comprising at least one deflection body (18) the path of the light beam and the control means (24) 5 of the deflection body (18), characterized in that the static scanning means (14) further comprise optical means (28) for amplification the deflection of the path of the light beam, placed downstream of the deflection body (18) by considering the direction of propagation of the light beam (L). 10
    [0002]
    2. Lighting system according to claim 1, wherein the deflection body (18) is a reflecting body capable of reflecting the light beam (L), and wherein the steering means (24) of the deflection body comprise means for generating a stationary pressure wave in the reflecting body (18), this wave being frequency-controllable for scanning the light beam (L).
    [0003]
    3. Lighting system according to the preceding claim, wherein the reflective body (18) has a reflective surface (32) of the light beam forming a diffraction grating. 20
    [0004]
    4. Lighting system according to claim 1, wherein the deflection body (18) is a transparent body, traversed by the light beam, and wherein the control means (24) of the deflection body comprise means for generating a stationary pressure wave in the transparent body, this wave being frequency-controllable to scan the light beam.
    [0005]
    An illumination system according to claim 1, wherein the deflection body (18) is a transparent refractive body of the light beam, for example a prism, and wherein the steering means (24) of the deflection body comprise means for generating a variable electric field in the transparent refraction body.
    [0006]
    The illumination system of claim 5, wherein the Kerr constant of the transparent refraction body (18) is greater than 1.10-12 m.V-2. 35
    [0007]
    The illumination system of claim 5, wherein the transparent refraction body (18) is a crystal belonging to the trigonal, tetrahedral, hexagonal, triclinic, monoclinic or orthorhombic crystalline system.
    [0008]
    8. Lighting system according to any one of claims 1 to 7, wherein the optical means (28) for amplifying the deflection of the path of the light beam comprise a convex mirror (29), for example cylindrical or spherical.
    [0009]
    9. Lighting system according to any one of claims 1 to 7, wherein the optical means (28) for amplifying the deflection of the path of the light beam 10 comprise a lens (34), preferably divergent.
    [0010]
    10. Lighting system according to any one of claims 1 to 9, further comprising means (30) for absorbing the light beam for absorbing the light beam when the deflection body is in a predetermined rest position.
    [0011]
    11. A method of securing a lighting system, characterized in that the lighting system is according to claim 10, and in that, when the control means (24) of the deflection body are deactivated, the deflection body (18) is placed in its rest position.
    [0012]
    12. Lighting system according to any one of claims 1 to 10, further comprising means (26) for controlling the light source (12).
    [0013]
    13. A method of securing a lighting system, characterized in that the lighting system is according to claim 12, and in that, when the control means (24) of the deflection body are deactivated , the light source (12) is deactivated by means of the control means (26) of this light source. 15 20
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    同族专利:
    公开号 | 公开日
    FR3029265B1|2017-01-13|
    CN105652437A|2016-06-08|
    US20160153634A1|2016-06-02|
    EP3026330A1|2016-06-01|
    引用文献:
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    JP6311131B2|2013-08-07|2018-04-18|パナソニックＩｐマネジメント株式会社|Lighting device, vehicle, and control method thereof|KR20160069083A|2014-12-05|2016-06-16|현대자동차주식회사|Lamp for vehicle|
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    法律状态:
    2015-11-30| PLFP| Fee payment|Year of fee payment: 2 |
    2016-06-03| PLSC| Search report ready|Effective date: 20160603 |
    2016-11-30| PLFP| Fee payment|Year of fee payment: 3 |
    2018-08-31| ST| Notification of lapse|Effective date: 20180731 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1461589A|FR3029265B1|2014-11-27|2014-11-27|LIGHTING SYSTEM FOR A MOTOR VEHICLE WITH STATIC MEANS FOR SCANNING LIGHT BEAM|FR1461589A| FR3029265B1|2014-11-27|2014-11-27|LIGHTING SYSTEM FOR A MOTOR VEHICLE WITH STATIC MEANS FOR SCANNING LIGHT BEAM|
    EP15192834.8A| EP3026330A1|2014-11-27|2015-11-03|Lighting system for motor vehicle with static means for scanning a beam of light|
    US14/939,112| US20160153634A1|2014-11-27|2015-11-12|Lighting system for a motor vehicle with static light-beam scanning means|
    CN201510829216.3A| CN105652437A|2014-11-27|2015-11-25|Lighting system for a motor vehicle with static light-beam scanning means|
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