• 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 module (1) for a motor vehicle headlamp, capable of emitting a light beam cut off along a predetermined optical axis, said lighting module comprising: a light source (2) for generating a beam an optical element for receiving the beam generated by the light source and configured to form from said beam said light beam cutoff; said optical element comprising: a collimator (3) configured to receive the beam generated by the light source and to collimate this beam into a collimated beam; an optical coupler (4) configured to couple the collimated beam into a beam coupled into a beam light guide (5), a cut-off means disposed within said light guide on the ray path of the beam coupled and configured to intercept a portion of said rays in the light guide and form a cut-beam, and -at least an output face (7) of said light guide configured to project said cut-off beam out of the optical element, and characterized in that the optical element is formed in one piece.
    公开号:FR3051541A1
    申请号:FR1654403
    申请日:2016-05-18
    公开日:2017-11-24
    发明作者:Maxime Laminette；Jean-Francois Doha；Lionel Floch
    申请人:Valeo Vision SA；
    IPC主号:
    专利说明:

    LED projector with diopter creating cutoff for vehicles
    The present invention relates to a light projector for a motor vehicle. The invention more particularly relates to a lighting optical module capable of producing a cut-off light beam, and configured to provide a function of LED spotlights (Cornehng Lamps) and / or fixed directional lighting.
    In the case of light-emitting diode (LED) headlights, projectors emitting a high-intensity beam in the direction of a road scene are known. These projectors can provide, in particular, fixed directional lighting functions called FBL (Fixed Bending Light in English) or mobile directional lighting called DBL (Dynamic Bending Light in English). The FBL and / or turn function makes it possible, for example, to progressively illuminate the side of the road when the vehicle turns. For this purpose, there is provided a light source which can gradually generate a beam illuminating the road during the negotiation of a turn. To avoid, however, that the light emitted does not create glare from another motorist, generally means are provided for making a cut of the beam at a certain level above the road. The light rays of the light beam are thus emitted below a line or a plane, called a cut.
    It is known in this sense light projectors comprising an optical module emitting a light beam cut. A projector of this type is known for example from EP 1 715 245, which describes a lighting module providing a cut-off light beam with a folder without reflective coating, that is to say operating by internal reflection.
    A headlamp configured to emit a cut-off beam must, however, emit a sufficient light flux in the direction of movement of the vehicle, or in a direction slightly oblique relative to the longitudinal axis of the vehicle. This poses a number of problems, since the projectors usually comprise one or more optical modules emitting light beams whose optical axis coincides more or less with the longitudinal axis of the vehicle.
    This type of module also has different other disadvantages. A frequent problem encountered in this context relates to the means of limiting the output height of the light beam emitted by such projectors, while maintaining a sufficient light output and optimum performance. In addition, this type of module generally allows to illuminate a road scene on a low angle of aperture. The juxtaposition of several of these modules to form a broad beam projector solves this problem, but poses congestion problems because of the large thickness of the device. Indeed, the large volume occupied by such a projector disadvantage juxtaposition of several of these modules to form a light beam cut. In particular, it is known that these lighting modules require complex manufacturing processes using multi-layer molds. In addition, in the case where it is desired to join several modules, the output face is not continuous and can reduce the quality of the beam. Finally, the large size of these modules significantly increases the unit price of such light projectors and makes their production cost prohibitive.
    To overcome these difficulties, the invention aims to propose a multi-source LED light projector with a diopter for a vehicle, giving a cut-off beam, and in which several modules make it possible to generate said cut-off light beam. The object of the invention is, above all, to propose a lighting module for a motor vehicle headlamp capable of emitting a light beam with a cut-off along a predetermined optical axis, said lighting module comprising: a light source for generating a beam . an optical element for receiving the beam generated by the light source and configured to form from said beam said cut-off light beam, said optical element comprising: a collimator configured to receive the beam generated by the light source and to collimate this beam in a collimated beam; - an optical coupler configured to couple the collimated beam into a beam coupled in a light guide; - a cutoff means disposed within said light guide in the path of said beams in the light guide and forming a cut-off beam, and - at least one exit face of said light guide configured to project said cut-off beam out of the optical element, and characterized in that the optical element is formed in one piece.
    By "substantially parallel directions", and more precisely by "substantially parallel rays" of a light beam, it will be understood here that the rays are directed in the form of a ray beam parallel more or less 5 °. Moreover, for the remainder of the description, the expression "face or surface" will be understood to mean a face or surface capable of reflecting an incident light ray by total reflection, or a surface or surface coated with a reflective coating to reflect an incident light ray. .
    According to different additional features of said lighting module that can be taken together or separately: the light guide has a substantially constant thickness; - The breaking means comprises an edge of a surface of said light guide, in particular a lower wall of the light guide between said coupler and said at least one exit face; the cut-off means comprises a surface of said light guide, said wall extending from said edge and arranged to return a portion of the rays in the light guide; - The cutting means forms a hook in the light guide, said hook-off forming an angle with a horizontal portion and with an inclined portion; the collimator is configured to deflect the beams of the beam generated by the source so as to make them substantially parallel to each other; the collimator is a solid of revolution having an axis of revolution and comprises one or more reflecting surfaces; the collimator comprises a lens, a reflector, a refractor, or a concave or convex collimation means; the collimator comprises one or more internal faces arranged to reflect and / or refract rays of the generated beam. the optical coupler comprises a plurality of reflecting faces, each of said reflecting faces having in particular a section in the form of a polynomial segment, especially a parabolic segment; the optical coupler is configured to split the collimated beam into several distinct sub-light beams, and in particular into three distinct sub-light beams each emitted at 90 ° to each other; the optical coupler comprises a first reflecting face arranged to reflect the rays of a first light sub-beam of the collimated beam split in a direction substantially parallel to the optical axis towards the breaking means; if necessary, this first reflecting face is a first coupling face arranged to reflect and focus the rays of the first sub-beam on the breaking means - the optical coupler comprises at least a second reflecting face arranged to reflect the rays of a second light sub-beam of the collimated beam split to one or more reflecting surfaces of the light guide, and optionally a third reflecting surface arranged to reflect the rays of a third light sub-beam of the collimated beam split to one or more other surfaces reflection of the light guide; the light source comprises a plurality of light-emitting diodes arranged on the same plane, said plane being disposed under said collimator and / or under said breaking means with respect to said optical axis; the light guide comprises a plurality of faces, in particular planar faces, disposed close to said optical coupler for redirecting all the rays of said sub-beams in the light guide in a direction substantially parallel to the direction of said optical axis towards the means cutoff; - The light guide has an upper face and a lower face interconnected by a wafer, said upper face and said lower face extending in substantially parallel planes between them. - The light guide comprises at least one reflecting face configured to receive a portion of the beams of the beam coupled by the optical coupler, in particular the second and third sub-beams, and to reflect and focus these rays on the breaking means. the face or faces of the light guide are arranged at the rear of the optical coupler along the optical axis; the distance separating the distal radius of said cut-off beam and said optical axis is less than or equal to 10 mm. The invention further aims at providing a light projector comprising a plurality of lighting modules, said modules having one or more of the above characteristics, and characterized in that a plurality of said modules are juxtaposed, preferably five of said modules, to generate a beam, said resulting beam, in the direction of an optical axis of one of said modules.
    According to various additional features of said luminous headlamp that can be taken together or separately: the output faces of each of said modules are united in a single continuous smooth surface, in particular a mirror common to said plurality of modules; - The modules are configured to perform a fixed directional lighting function and / or turn with a luminous flux greater than or equal to 200 lumens. Other characteristics, details and advantages of the invention will emerge on reading the description given with reference to the accompanying drawings given by way of example and which represent, respectively: FIG. 1, a cross-sectional view of a lighting module according to an exemplary embodiment of the invention; - Figure 2, a perspective sectional view of a collimator and a coupler according to an embodiment of the invention; - Figure 3, a diagram illustrating the operation of a coupler according to an embodiment of the invention; FIG. 4, a diagram illustrating the tracing of the light rays transmitted in a lighting module according to an exemplary embodiment of the invention; - Figures 5a, 5b and 5c, respectively, a sectional view of a lighting module according to several embodiments of the invention; - Figure 6, a front sectional view of a lighting module according to an exemplary embodiment of the invention; - Figure 7, a network of isolux curves established for a given luminous flux, and obtained with a lighting module whose output surface has no modulation of thickness to change the cutoff inclination of said beam; FIG. 8, a network of isolux curves established for a given luminous flux, and obtained with a lighting module whose output surface comprises a thickness modulation for modifying the cut-off inclination of said beam; - Figures 9a and 9b, a perspective view and a sectional view from above, respectively, of a light projector according to a first example of implementation of the invention; - Figures 10a and 10b, a perspective view and a sectional view from above, respectively, of a light projector according to a second example of implementation of the invention.
    In Figure 1, there is shown a cross-sectional view of a lighting module 1 adapted to give a light beam cutoff for a motor vehicle headlamp. For the following description, it will be understood that the surfaces of the module 1 define an orthogonal reference XYZ whose X, Y and Z directions respectively correspond to the height axis of said module along X, to the axis length of said module according to Y and the width axis of said module according to Z.
    According to an exemplary embodiment of the invention, a light source 2 is disposed below the module 1. In the context of this text, the terms "above" and "below" will be understood as indications of orientation when the module 1 is disposed in normal use position, once incorporated into a light projector mounted in a vehicle. According to the embodiment of the invention, we will also define the plane of the horizontal as being parallel to the plane of the road illuminated by said projector in its nominal operating mode. It will be understood that a module is not necessarily oriented parallel to the plane of the horizontal in the directions Y and Z as defined respectively by the length axis and the width axis of said module. According to the exemplary embodiment of the invention, the source 2 is an extended source whose light rays have any directions in space. Preferably, the source 2 is a light emitting diode, abbreviated to LED. Advantageously, the source 2 comprises a plurality of light-emitting diodes located in the same plane, and for example arranged on a PCB printed circuit located below the module 1. An arrangement of said LEDs on the same PCB plane facilitates the manufacture of a module. lighting according to the embodiment of the invention, including the connection and welding of the various components.
    As illustrated in FIG. 1, the lighting module 1 comprises an optical element comprising a plurality of elements. According to an exemplary embodiment of the invention, said optical element is formed in one piece, and comprises light redirection means, in particular a collimator 3, a coupler 4 and a light guide 5 both located at above the light source 2. Advantageously, the collimator 3 and the coupler 4 can be in contact. According to the exemplary embodiment of the invention, the collimator 3 is located below the guide 5. The collimator 3 is a solid of revolution characterized by an axis of revolution A, said axis of revolution being directed in the direction X of the XYZ marker. Said collimator consists of one or more reflective surfaces. In a variant, said collimator may comprise a lens, a reflector, a refractor, or any other means of collimation of the concave or convex type.
    As shown in FIG. 1 and in FIG. 2, the collimator 3 comprises a lower entry face 3a, one or more lateral reflection faces 3b, and an upper exit face 3c. The lower face 3a of the collimator 3 is a light input face adapted to receive light emitted by a light source when said source is disposed under said collimator. A collimator according to the exemplary embodiment of the invention is typically configured to receive all of the light beam rays emitted below the input face 3a, in particular all of the rays emitted by the source 2. Preferably, the source 2 is disposed on the axis A and below the collimator 3. The side face or faces 3c may have a cylindrical shape with a parabolic profile, or close to a parabola when considering a section of those in a plane orthogonal to the direction of the horizontal. The collimator 3 has in particular the form of a truncated cone whose bases 3a and 3b are transparent to the passage of light, and thus the one or more side faces 3c reflect the light in total reflection. The faces 3a, 3b and 3c of the collimator 3 are calculated so as to harvest in a homogeneous manner the light intensity emitted by the source 2. Regardless of their initial directions, the collected rays are reflected by one or more internal faces of said collimator, that it being configured to make the harvested rays substantially parallel to each other at the exit thereof.
    The light rays emitted by the source 2 and passing through the collimator 3 are refracted by the one or more lateral faces 3c in order to be directed directly towards the exit face 3c located opposite the face 3a. These faces are configured to reflect the radii in a direction substantially parallel to the X axis when they emerge from the collimator 3 by the face 3c. These rays are transmitted towards the input of the coupler 4 located above the collimator 3. The collimator 3 is itself located below the coupler 4 and below the light guide 5.
    The light guide 5 that comprises the module 1 has an upper face 5a and a lower face 5b interconnected by a wafer 5c. The upper 5a and lower 5b faces extend in planes substantially parallel to each other. The light guide 5 may however have several deformations, in particular, one or more unhooked. The guide 5 is configured to have a substantially constant thickness, that is to say constant at plus or minus 10%, at any point along its length. By thickness is meant the distance separating the upper face 5a and the lower face 5b of said guide in a plane perpendicular to said upper face. The inner surfaces of the guide may be partially or completely coated with a reflective material. According to one embodiment of the invention, two unhooked 6 and an exit face 7 are also present, as will be described later. These off-hooks, in particular the off-hook corresponding to the lower face 5b, can play the role of an optical folding machine. The edges of the folder and the materials constituting it may allow said folder to work in total reflection. Said folder is able to vertically deflect the light rays coming from the coupler so as to form a cut. By "optical folding", it will be understood here that said stall has a cutting edge 8 and possibly, but not necessarily, a reflective surface for blocking and / or deflecting a portion of the transmitted light beam in the light guide. The presence of a reflective surface, for example a convex reflective surface, also has the advantage of allowing broadening of the beam, and thus of creating a wide outgoing beam at break. Said cut can be achieved by various means including, in particular, one or more blackout elements. This or these blackout elements may include an opaque screen, a cache, a mirror, or a combination of these elements. The height of the cutoff may, in particular, be at the same height as the lower surface 5b of the light guide. Those skilled in the art will however understand that this height can easily be adjusted by modifying the dimensions and / or the positions of the surfaces characterizing the light guide 5.
    In Figure 3, there is shown a section in the YZ plane of the collimator 3 and the coupler 4 as previously described. Preferably, said coupler is aligned vis-à-vis the collimator 3 in the direction X so that all of the light beam transmitted by said collimator is received by said coupler. The coupler 4 is configured to deflect the beam emerging from the collimator 3 and directing said beam inside the light guide 5. The coupler 4 has three faces 4a, 4b and 4c, which are configured to reflect and separate said beam in three directions. distinct sub-beams. Said faces are, typically, surfaces working in total reflection. Preferably, these sections are each inclined at an angle of 45 ° relative to the inclination defined by the horizontal, for example a horizontal plane YZ. This results in a suitable redirection of an incoming light beam parallel to the X direction in three light sub-beams directed in the Y direction. The rays emerging from the collimator 3 and penetrating into the coupler 4 strike at least one of the sections constituted by one of the faces 4a, 4b or 4c. Each of said faces may have a parabolic or semi-parabolic section in planes parallel to the Y and Z axes. Said parabolic or semi-parabolic sections have a focal region for characterizing a main optical axis of a beam transmitted by the module 1, said optical axis being directed in the direction Y. These focal regions may comprise in particular a focus at the same distance and a vertex at the same height.
    As shown in FIG. 3, a beam entering the coupler 4 is split into three distinct sub-light beams Fa, Fb and Fc each emitted at 90 ° relative to each other, in a plane parallel to the directions Y and Z. The rays of the sub-beam Fa are thus reflected by the face 4a and have a direction substantially parallel to the direction Y. The rays of the sub-beam Fb are reflected by the face 4b and have a direction substantially antiparallel to the Z direction The beams of the sub-beam Fc are reflected by the face 4c and have a direction substantially parallel to the direction Z.
    According to an exemplary embodiment of the invention, a plurality of faces 5c, 5d and 5e, in particular a plurality of plane faces, is disposed near the coupler 4 to redirect all the beams of the sub-beams Fa, Fb and Fc in the light guide 5 in a direction substantially parallel to the direction Y. The beams of the sub-beam Fb are thus reflected by the face 4b into a sub-beam Rb directed in the direction Y. The beams of the sub-beam Fc are reflected by the face 4c into a sub-beam Rc directed in the direction Y. The sub-beams Fa, Rb and Rc are thus all directed parallel to the folder 8 in the direction Y. Preferably, the faces 5c, 5d and 5e 5c, in particular, is located behind the coupler 4 and connects the upper face 5a and the lower face 5b of the light guide 5. The faces 5d and 5e are reflective faces working in total reflection and are arranged at an angle of 45 ° relative to the direction Y. In particular, the face 5d is configured to reflect any incident ray Fc parallel to the direction Z in a radius Rc parallel to the Y direction. face 5e is configured to reflect any incident ray Fb antiparallel to the direction Z in a radius Rb parallel to the direction Y. Each of the spokes constituting the initial light beam emitted by the source 2 is thus redirected in the Y direction on the folder 8 inside the light guide 5.
    In FIG. 4 showing a side view of the module 1, the ray of light transmitted by the coupler 4 in the direction of the bender 8 forming the cut-off of the beam and then of the exit face 7 is illustrated in the light guide 5. The presence of the two off-hooks 6b and 6d makes it possible to modify the height of the light guide 5 without modifying the thickness thereof. According to an exemplary embodiment of the invention, the edges of the two unhooked 6b and 6d are inclined at the same angle relative to the direction of the horizontal. The upper edge 5a and the lower edge 5b of the guide 5 may have an inclination at the same angle relative to the direction of the horizontal. The edge 8 thus forms a folder capable of forming a cutoff of the incident beam and transmitted by the means previously described. Said cut is made according to a cutting plane parallel to the lower edge 5b of the guide 5. This cutting plane is located at the same height as the folder, that is to say the cutting edge 8. The top hook, corresponding at the face 5a of said guide, allows to change the height of the guide 5 while keeping the thickness of the piece constant. All the light rays coming out of the light guide 5 through the exit face 7 are thus forced to propagate only in a region of the space below said cutoff plane. Alternatively, the unhooking of a light guide can be performed to obtain the cut of a lower portion of the beam.
    It will be understood that the position and the angle of the dihedron 6a-6b are calculated so that the folder formed by the edge 8 blocks the light rays likely to exit the guide 5 above the cut, here shown in a non-transparent manner. limiting as being located at the same height as the optical axis O and the lower edge 5b of the light guide 5. The parabolic and / or semi-parabolic sections of the coupler 4 are worked so as to define a focal region for directing the set of light beams on the edge of the folder 8, in a direction substantially parallel to the optical axis O. The optical axis O is, for example, a horizontal axis directed along Y, and parallel to the upper faces 5a and lower 5b of the guide 5. According to an exemplary embodiment of the invention, the optical axis O defines in particular the main direction of the emitted light beam providing a function FBL. The cut-off beam is projected in a direction substantially parallel to the optical axis O. The height of the cut-off line obtained is thus substantially equal to the height of the lower edge 5b of the light guide 5. The exit face 7 makes it possible to close the light guide 5, for example by means of a closure glass of plastic or glass. The output face 7 also makes it possible to produce an output image of the beam. An exit face according to the invention may be, for example, a spherical or cylindrical lens for imaging the edge of the folder 8 and projecting the light beam towards the front of the module 1, in the direction of the road scene .
    In summary, there is shown in Figure 4 an embodiment of the invention relating to a lighting module 1 comprising an optical element, said optical element comprising a collimator 3 located below a light guide 5 and an off-hook 6b-6d forming the cutoff means of the optical element. As illustrated, the light source 2 is disposed below the collimator 3 and emits upwards towards the optical coupler 4, configured to globally deflect the beams of the collimated beam along the optical transmission axis, in the light guide. 5. For this embodiment, the stall extends from an upper portion of the light guide to a lower portion of said guide, thus forming a step downwards to cut the upper part of the beam.
    FIGS. 5a, 5b and 5c show other exemplary embodiments according to the invention. FIG. 5a is thus a variant of a lighting module 1 in which the light source 2 is disposed below the collimator 3 and emits upwards in the direction of the optical coupler 4. The beam is transmitted in the light guide 5, and the cut-off beam is projected by the exit face 7. For this variant, the off-hook 6b-6d extends from a lower portion of the light guide 5 towards an upper portion of said guide, forming a step upwards. in the device for making a cut of the lower part of the beam.
    FIG. 5b is another variant of a lighting module 1 in which the light source 2 is disposed above the collimator 3, said collimator being itself situated above the coupler 4. For this variant, the Off-hook 6b-6d extends from an upper portion of the light guide 5 to a lower portion of said guide, thereby forming a downward step. This arrangement and the formation of a downward movement makes it possible to cut the upper part of the projected beam by the exit face 7.
    FIG. 5c is another variant of a lighting module 1 in which the light source 2 is disposed above the collimator 3, said collimator being itself situated above the coupler 4. For this variant, the Off-hook 6b-6d extends from a lower portion of the light guide 5 to an upper portion of said guide, thereby forming an upward step. This arrangement and the achievement of an upward movement makes it possible to cut the lower part of the projected beam by the exit face 7.
    According to an exemplary embodiment of the invention, the module 1 may have an inclination at a certain angle with respect to the horizontal and around the Y direction, while having an optical axis O parallel to the Y direction. FIG. 6 shows a front sectional view of said module 1. The emission direction of the light source 2 is defined by an OS plane, said source transmission plane, passing through the optical axis O of the module . Due to the inclination of the module 1, the plane OS is inclined at a given angle with respect to the vertical, in particular with respect to a transverse plane OX oriented in the direction X and passing through the optical axis O of the module. Said transverse plane OX is perpendicular to the horizontal, in particular with respect to a horizontal plane OZ. The plane OS is perpendicular to the direction of the folder 8.
    As described above, the cutting of the beam is obtained from the folder 8. When the module 1 is inclined at an angle relative to the horizontal, in particular with respect to the horizontal plane OZ, the cutting of the beam projected by said module is inclined at an angle a, said angle of inclination of the cut.
    To overcome this inclination and correct the beam cutoff, the output face 7 includes rectifying means arranged to change the angle of inclination of the cut. According to an exemplary embodiment of the invention, said rectifying means comprise a thickness modulation of the output face. In particular, the output face 7 can be worked so as to have a thickness modulation of said output face. Advantageously, the thickness modulation has an inclination angle a 'with respect to the horizontal in the plane of the exit face 7. In particular, this thickness modulation is calculated so as to modify the angle of inclination of the cut a. According to an exemplary embodiment of the invention, the thickness modulation of the output face may be formed by a boss in the plane of said output face, in particular a sinusoidal or quasi-sinusoidal boss. According to an exemplary embodiment of the invention, said thickness modulation may comprise a plurality of corrugations 9, in particular trigonometric corrugations. Said corrugations are made so as to be substantially parallel to a plane OS ', said plane of creation of the sections or plane of the undulations. According to an exemplary embodiment of the invention, this plan for creating the OS 'sections is inclined at an angle a' with respect to the transverse plane OX. According to an embodiment of the invention, the angle of inclination α of the cutoff and the angle of inclination α 'of corrugations of the corrugations are two angles whose sum of values equals 90 °, more or less 5 ° near. In other words, the angle a 'between the plane OS' and the plane OX is advantageously complementary to the angle of inclination α between the plane OS and the plane OX.
    According to an exemplary embodiment of the invention, said output face may be a lens. In this embodiment, said lens may have a corrugated face having corrugations having the same vertical slope, or vertical slopes different from the horizontal. Advantageously, the exit face 7 is worked so as to comprise substantially parallel corrugations with each other in the plane of said exit face. Preferably, the corrugations 9 are separated from each other by a constant pitch. Alternatively, the corrugations 9 are separated from each other by an evolutionary step. These corrugations typically take the form of bumps distributed over the entire exit face. These bumps may be provided with patterns, and / or may be formed by recesses, reliefs, or a combination of recesses and reliefs. The presence of corrugations on the outlet face 7 has the effect of modifying the inclination of the cut. In particular, these corrugations can be calculated to produce a beam whose cut is rectified horizontally. The cutoff of the resulting beam can therefore be horizontal while the inclination of the bender 8 generating said cutoff is inclined at an angle to the horizontal.
    The shape of the modulations on the output face of the module may be a sinusoidal or quasi-sinusoidal boss. The shape of the modulations on the output face of the module is typically a cylindrical or quasi-cylindrical curve.
    According to an exemplary embodiment of the invention, the output face 7 is continuous and has corrugations 9. Each corrugation can be extruded. The geometry of the exit face, and the geometry of these extruded corrugations, may correspond to different shapes, for example a cylindrical lens section, or a spherical lens section.
    FIGS. 7 and 8 illustrate an example of photometry of a cut-off beam for a lighting module as described above, and whose edge of the folder 8 forming said cutoff is inclined at an angle of 30.degree. the horizontal. The light beam generated by said module may be represented by a set of closed surfaces, corresponding to different isolux curves, for example X1, X2 and X3. Each of these curves corresponds to an isolux curve for a given luminous flux characterizing the illumination of the beam generated by the module 1.
    FIG. 7 illustrates the particular case of a lighting module whose output face has no modulation of thickness to modify the cutoff inclination of said beam. As shown in Figure 7, the curves X1, X2 and X3 are all located below the same line of cut, here represented by the line C1 in dashed lines. It will be understood that said cut line C1 is inclined at the same angle as the edge of the folder 8 relative to the horizontal, here an angle of 30 °. Said cut line C1 and also tangent to the set of curves X1, X2 and X3.
    FIG. 8 illustrates the case of a lighting module according to an exemplary embodiment of the invention, and whose output face comprises a modulation of thickness making it possible to modify the angle of inclination of the cutoff of said beam by report horizontally. Said thickness modulation of the output face 7 is calculated to modify the angle of inclination of the cut line C1 relative to the horizontal. In the case described here, this angle of inclination is equal to the angle of 30 ° present between the edge of the folder 8 and the horizontal.
    When the light rays of the beam pass through the exit face 7, the thickness modulation thus modifies the inclination of the cutoff line C1 so as to obtain a horizontal cutoff line C2. As shown in FIG. 8, the isolux curves X1, X2 and X3 are thus modified into isolux curves Y1, Y2 and Y3. Said curves are ultimately all located below the same cut line, horizontal, here represented by the line C2 in dashed lines.
    For this example, the output face is worked so that the corrugations on said output face have a slope of 60 ° with the horizontal, plus or minus 5 °. The angle of this slope is complementary to the angle of 30 ° formed between the edge of the folder 8 and the horizontal. This embodiment thus makes it possible to straighten a cut-off line of a beam, said cut line generated being also inclined at an angle of 30 ° because of the disposition of the edge of the folder. Advantageously, "straightening" therefore a beam by rotating the projected image of the edge of the folder 8 about an axis parallel to the horizontal. This axis passes through the center of the edge of the folder 8 and is parallel to the longitudinal axis of the vehicle.
    Figures 9a and 9b illustrate a light projector P1 according to a first example of implementation of the invention, in perspective and in view from above, respectively. Such a projector is typically configured to give a thin piece. According to the embodiment shown, said projector P1 consists of several lighting modules juxtaposed next to each other, preferably five lighting modules 10, 11, 12, 13 and 14 contiguous to each other. the other. Said modules are configured to prevent the passage of parasitic rays from one module to another. The projector PI may also be provided with attachment points 16 and 17, located on either side of the ends of said projector, for its attachment inside a motor vehicle.
    Said five modules are, for example, SBL modules (Static Bending Light in English, for static directional lighting). The outgoing flow of such a device is typically of the order of 340 μm, with an efficiency of 30%. Each of these modules presents, individually, all the technical characteristics of a lighting module 5 as described above. The projector PI also comprises a plurality of light sources not shown in FIGS. 9a and 9b. Said light sources, preferably five light sources, are arranged on the same plane below each lighting module. Said light sources are in particular light-emitting diodes of LED type. In particular, each of the lighting modules 10, 11, 12, 13 and 14 comprises light redirection means comprising a collimator, a coupler, a light guide and one or more reflection faces joined in one piece and for redirecting a light beam in a direction substantially parallel to an optical axis O.
    As described above, the collimator of each of said modules has the function of harvesting the light beam emitted by all the light sources located below the lighting modules that includes the projector PI. As described above, the coupler of each of said modules has the function of separating said beam into three sub-beams, and directing said sub-beams in the light guide that each PI module comprises. Each coupler, typically, has parabolic or semi-parabolic sections. The foci of these sections are on the edge of a hook of the corresponding module, to converge the light beams in these homes and thus achieve a cut of the beam generated by each module. These sections are thus configured to direct said sub-beams on the edges of the folders 10b, 11b, 12b, 13b and 14b, each of said folders being able to cut the beam generated by each module.
    The cut-off beam obtained is then directed towards the output surfaces of the modules that the projector P1 comprises, and in a direction substantially parallel to a given optical axis O. Said optical axis O corresponds, for example, to the optical axis of one of the modules, for example the central module 12. The opening angle allowed by the output face of each of said modules typically makes it possible to generate a beam from 15 ° to 20 ° wide. The juxtaposition of five of said modules makes it possible, typically to generate a resulting overall beam having an opening of between 20 ° and 80 °.
    According to an exemplary embodiment of the invention, the projector PI has an output face consisting of a single piece common to all five lighting modules 10, 11, 12, 13 and 14. In particular, and as shown, the output faces of each of said modules are joined into a single continuous smooth surface 15, for example a mirror common to all modules. Alternatively, said surface may be beaded and / or grained instead of being smooth. Said surface 15 may have corrugations able to straighten the cutoff line of the beam generated by each module.
    Still according to this embodiment of the invention, the edges of the folders 10b, 11b, 12b, 13b and 14b of each of the juxtaposed lighting modules are not necessarily aligned on the same line. It will be understood that a small vertical offset can be allowed between two modules contiguous to one another. Advantageously, the corrugations on the output face 15 are configured so that a projector consisting of several of said modules generates a resulting beam whose cutoff plane is parallel to the horizontal. The cut appears as a horizontal line on the road. In addition, each of said modules may be inclined relative to the horizontal with a certain angle, for example 45 °. The edges of the folders 10b, 11b, 12b, 13b and 14b cutting the beam generated by each of these inclined modules will therefore also be inclined with an equal angle. The juxtaposition of several modules, including five modules, however, is performed so as to allow the projector PI to generate a light beam having the same cutoff plane.
    Figures 9a and 9b illustrate a light projector PI according to a first example of implementation of the invention, in perspective and in view from above, respectively. Such a projector is typically configured to give a thin piece. According to the embodiment shown, said projector P1 consists of several lighting modules juxtaposed next to each other, preferably five lighting modules 10, 11, 12, 13 and 14 contiguous to each other. the other. Said modules are configured to prevent the passage of parasitic rays from one module to another. The projector PI may also be provided with attachment points 16 and 17, located on either side of the ends of said projector, for its attachment inside a motor vehicle.
    Said five modules are, for example, SBL modules (Static Bending Light in English, for static directional lighting). The outgoing flow of such a device is typically of the order of 340 μm, with an efficiency of 30%. Each of these modules presents, individually, all the technical characteristics of a lighting module 5 as described above. The projector PI also comprises a plurality of light sources not shown in FIGS. 9a and 9b. Said light sources, preferably five light sources, are arranged on the same plane below each lighting module. Said light sources are in particular light-emitting diodes of LED type. In particular, each of the lighting modules 10, 11, 12, 13 and 14 comprises light redirection means comprising a collimator, a coupler, a light guide and one or more reflection faces joined in one piece and for redirecting a light beam in a direction substantially parallel to an optical axis O.
    As described above, the collimator of each of said modules has the function of harvesting the light beam emitted by all the light sources located below the lighting modules that comprises the projector P1. As described above, the coupler of each of said modules has the function of separating said beam into three sub-beams, and directing said sub-beams in the light guide that each module comprises of P1. Each coupler, typically, has parabolic or semi-parabolic sections. The foci of these sections are on the edge of a hook of the corresponding module, to converge the light beams in these homes and thus achieve a cut of the beam generated by each module. These sections are thus configured to direct said sub-beams on the edges of the folders 10b, 11b, 12b, 13b and 14b, each of said folders being able to cut the beam generated by each module.
    The cut-off beam obtained is then directed towards the output surfaces of the modules that the projector P1 comprises, and in a direction substantially parallel to a given optical axis O. Said optical axis O corresponds, for example, to the optical axis of one of the modules, for example the central module 12. The opening angle allowed by the output face of each of said modules typically makes it possible to generate a beam from 15 ° to 20 ° wide. The juxtaposition of five of said modules makes it possible, typically to generate a resulting overall beam having an opening of between 20 ° and 80 °.
    According to an exemplary embodiment of the invention, the projector PI has an output face consisting of a single piece common to all five lighting modules 10, 11, 12, 13 and 14. In particular, and as shown, the output faces of each of said modules are joined into a single continuous smooth surface 15, for example a mirror common to all modules. Alternatively, said surface may be beaded and / or grained instead of being smooth. Said surface 15 may have corrugations able to straighten the cutoff line of the beam generated by each module.
    Still according to this embodiment of the invention, the edges of the folders 10b, 11b, 12b, 13b and 14b of each of the juxtaposed lighting modules are not necessarily aligned on the same line. It will be understood that a small vertical offset can be allowed between two modules contiguous to one another. Advantageously, the corrugations on the output face 15 are configured so that a projector consisting of several of said modules generates a resulting beam whose cutoff plane is parallel to the horizontal. The cut appears as a horizontal line on the road. In addition, each of said modules may be inclined relative to the horizontal with a certain angle, for example 45 °. The edges of the folders 10b, 11b, 12b, 13b and 14b cutting the beam generated by each of these inclined modules will therefore also be inclined with an equal angle. The juxtaposition of several modules, including five modules, however, is performed so as to allow the projector PI to generate a light beam having the same cutoff plane.
    Figures 9a and 9b illustrate a light projector according to a second example of implementation of the invention, in perspective and in view from above, respectively. A light projector PI consists of several lighting modules juxtaposed next to each other, preferably five lighting modules 10, 11, 12, 13 and 14 contiguous to one another.
    Similarly to the previous embodiment, each of said modules comprises a collimator, a coupler, a light guide and one or more reflection faces joined in one piece. According to this embodiment, the off-hooks 10b, 11b, 12b, 13b and 14b associated with the different juxtaposed lighting modules are substantially aligned with each other. Preferably, the projector modules are not unhooked and are all located at a substantially identical height. This configuration makes it possible to produce a thin projector giving a cut-off beam.
    A plurality of light sources, for example five LEDs, is disposed on a plane below said light modules. These LEDs are not shown in Figures 10a and 10b. Each of said collimators is configured to collect the largest possible portion of the light intensity emitted by each of said LEDs. The beam is then transmitted to the couplers 10a, 11a, 12a, 13a and 14a located above each collimator, to be then directed on the edge of the folders 10b, 11b, 12b, 13b and 14b in the corresponding lighting module. The spokes are then directed towards one or more exit surfaces, in a direction substantially parallel to a given optical axis O. According to the present embodiment of the invention, the output surface (s) are configured to counteract the inclination of the modules and / or the cutoff lines generated by each of the modules.
    As before, the edge of said edges corresponds to the focal regions of the parabolic sections characterizing said couplers. The edges then make it possible to cut each transmitted beam by blocking the rays located above it. The projector PI has an exit face consisting of several parts 10c, 11c, 12c, 13c and 14c. These parts may optionally comprise a single output face common to all five lighting modules 10, 11, 12, 13 and 14. These output faces may consist of one or more smooth surfaces, in order to image the edges 10b, 11b, 12b, 13b and 14b. Said output faces can also be modified so as to focus the light on a ridge working in total reflection. Thus, the output image of the module will be a cut-off beam.
    These characteristics make it possible to produce a light projector constituted of a single piece. According to an exemplary embodiment of the invention, a projector having these characteristics is able to perform a cut-off lighting function on a very fine output height, advantageously less than 10 mm. By "output height advantageously less than 10 mm", it will be understood here that the distance separating the distal radius of said cut-off beam and the optical axis O of said beam is advantageously less than or equal to 10 mm.
    Regardless of the dimensions of the corresponding devices, a light projector according to the first embodiment described and / or a light projector according to the second embodiment described may in particular be configured to perform a FBL function and / or turn, with a luminous flux less than or equal to 200 lumens.
    This type of optical device has the advantage of being made of a single piece to achieve the desired imaging, while having a constant thickness. The small thickness of the part also makes it possible to manufacture this type of light projector by injection on a conventional press. This method of manufacture does not require the use of multi-layer molds, also reducing its cost of production. Finally, this type of device has a small footprint, facilitating its incorporation into a vehicle.
    Naturally, to meet specific needs, a person skilled in the field of the invention may apply modifications in the foregoing description.
    Although the present invention has been described above with reference to specific embodiments, the present invention is not limited to specific embodiments, and modifications that are within the scope of the present invention will be obvious to someone skilled in the art.
    权利要求:
    Claims (14)
    [1" id="c-fr-0001]
    1. Lighting module (1) for a motor vehicle headlamp, capable of emitting a light beam cutoff along a predetermined optical axis (O), said lighting module comprising: a light source (2) for generating a beam an optical element for receiving the beam generated by the light source and configured to form from said beam said cut-off light beam, said optical element comprising: a collimator (3) configured to receive the beam generated by the light source and to collimate this beam into a collimated beam, - an optical coupler (4) configured to couple the collimated beam into a beam coupled into a light guide (5), - a cutoff means (6) disposed within said light guide light on the ray path of the beam coupled and configured to intercept a portion of said rays in the light guide and form a cut-off beam, and - at least one face of fate ie (7) of said light guide configured to project said cut-off beam out of the optical element, and characterized in that the optical element is formed in one piece.
    [2" id="c-fr-0002]
    2. Lighting module (1) according to claim 1, characterized in that said light guide (5) has a substantially constant thickness.
    [3" id="c-fr-0003]
    3. Lighting module (1) according to any one of the preceding claims, characterized in that said cutoff means (6) forms a hook (6) in the light guide (5), said hook-off forming an angle with a horizontal part and with an inclined part.
    [4" id="c-fr-0004]
    4. Lighting module (1) according to any one of the preceding claims, characterized in that said collimator (3) is a solid of revolution having an axis of revolution (A) and comprises one or more reflecting surfaces.
    [5" id="c-fr-0005]
    5. Lighting module (1) according to any one of the preceding claims, characterized in that said collimator (3) comprises a lens, a reflector, a refractor, or a collimating means of concave or convex type.
    [6" id="c-fr-0006]
    6. Lighting module (1) according to any one of the preceding claims, characterized in that said optical coupler (4) comprises a plurality of reflecting faces (4a, 4b, 4c), each of said reflecting faces having in particular a section in the form of a polynomial segment, especially a parabolic segment.
    [7" id="c-fr-0007]
    7. Lighting module (1) according to any one of the preceding claims, characterized in that said optical coupler (4) is configured to split the collimated beam into three distinct sub-light beams (Fa, Fb, Fc) each emitted at 90 ° to each other.
    [8" id="c-fr-0008]
    8. Lighting module according to any one of the preceding claims, characterized in that said light source (2) comprises a plurality of light-emitting diodes arranged on the same plane, said plane being disposed under said collimator (3) and / or under the breaking means (6) with respect to said optical axis (O).
    [9" id="c-fr-0009]
    9. Lighting module (1) according to any one of the preceding claims, characterized in that said light guide (5) has an upper face (5a) and a lower face (5b) interconnected by a wafer ( 5c), said upper face and said lower face extending in planes substantially parallel to each other.
    [10" id="c-fr-0010]
    10. Lighting module (1) according to any one of the preceding claims, characterized in that said light guide (5) comprises at least one reflecting face (5c, 5d, 5e) configured to receive a portion of the spokes of the beam coupled by the optical coupler (4) and to reflect and focus these rays on the breaking means (6).
    [11" id="c-fr-0011]
    11. lighting module (1) according to any one of the preceding claims, characterized in that the distance separating the distal radius of said cut-off beam and said optical axis (O) is less than or equal to 10mm.
    [12" id="c-fr-0012]
    Light projector (PI) comprising a plurality of lighting modules (10, 11, 12, 13, 14) according to any one of the preceding claims, characterized in that a plurality of said modules are juxtaposed, preferably five of said modules, for generating a beam, said resulting beam, in the direction of an optical axis (O) of one of said modules.
    [13" id="c-fr-0013]
    13. Light projector according to the preceding claim, characterized in that the outlet faces (7) of each of said modules (10, 11, 12, 13, 14) are joined in a single continuous smooth surface (15), in particular an ice common to said multiple modules.
    [14" id="c-fr-0014]
    Light projector according to Claim 13 or 14, characterized in that the said modules (10, 11, 12, 13, 14) are configured to produce a fixed directional lighting function and / or a turning function with a higher luminous flux or equal to 200 lumens.
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    同族专利:
    公开号 | 公开日
    EP3246620A1|2017-11-22|
    EP3246620B1|2022-01-05|
    US10161592B2|2018-12-25|
    CN107401715A|2017-11-28|
    FR3051541B1|2020-04-17|
    US20170336042A1|2017-11-23|
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    法律状态:
    2017-05-30| PLFP| Fee payment|Year of fee payment: 2 |
    2017-11-24| PLSC| Publication of the preliminary search report|Effective date: 20171124 |
    2018-03-02| ST| Notification of lapse|Effective date: 20180131 |
    2018-05-28| PLFP| Fee payment|Year of fee payment: 3 |
    2018-06-08| D3| Ip right revived|Effective date: 20180507 |
    2019-05-31| PLFP| Fee payment|Year of fee payment: 4 |
    2020-05-30| PLFP| Fee payment|Year of fee payment: 5 |
    2021-05-31| PLFP| Fee payment|Year of fee payment: 6 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1654403|2016-05-18|
    FR1654403A|FR3051541B1|2016-05-18|2016-05-18|LED PROJECTOR WITH CUT-OUT DIOPTRE FOR VEHICLES|FR1654403A| FR3051541B1|2016-05-18|2016-05-18|LED PROJECTOR WITH CUT-OUT DIOPTRE FOR VEHICLES|
    EP17170507.2A| EP3246620B1|2016-05-18|2017-05-10|Led headlight with dioptre creating a cut-out for vehicles|
    CN201710347842.8A| CN107401715A|2016-05-18|2017-05-17|LED headlamps with the refracting interface that cut-off is produced for vehicle|
    US15/598,847| US10161592B2|2016-05-18|2017-05-18|LED headlamp with refractive interface creating cut-off for vehicles|
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