EP2489925B1 - Optical unit for a signalling and / or lighting device - Google Patents
Optical unit for a signalling and / or lighting device Download PDFInfo
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- EP2489925B1 EP2489925B1 EP12155491.9A EP12155491A EP2489925B1 EP 2489925 B1 EP2489925 B1 EP 2489925B1 EP 12155491 A EP12155491 A EP 12155491A EP 2489925 B1 EP2489925 B1 EP 2489925B1
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- lens
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- 230000003287 optical effect Effects 0.000 title claims description 42
- 230000011664 signaling Effects 0.000 title claims description 5
- 230000000295 complement effect Effects 0.000 claims description 29
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 2
- 238000005286 illumination Methods 0.000 description 4
- 241000234295 Musa Species 0.000 description 3
- 235000018290 Musa x paradisiaca Nutrition 0.000 description 3
- 230000004907 flux Effects 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 241001080024 Telles Species 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
- F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
- F21S43/13—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source characterised by the type of light source
- F21S43/14—Light emitting diodes [LED]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
- F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
- F21S41/141—Light emitting diodes [LED]
- F21S41/147—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
- F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
- F21S41/141—Light emitting diodes [LED]
- F21S41/155—Surface emitters, e.g. organic light emitting diodes [OLED]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
- F21S41/25—Projection lenses
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
- F21S41/25—Projection lenses
- F21S41/255—Lenses with a front view of circular or truncated circular outline
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
- F21S41/25—Projection lenses
- F21S41/275—Lens surfaces, e.g. coatings or surface structures
Definitions
- the invention relates in particular to an optical unit, in particular for a signaling and / or lighting device for a motor vehicle.
- an optical unit is for example known from the document DE 20 2005 004 080 U1 .
- the present invention aims in particular to avoid this type of drawback.
- the subject of the invention is thus an optical unit comprising the characteristics of claim 1.
- isotropic source means a source whose intensity is independent of the angle of observation, inside the solid angle containing all of its rays.
- a Lambertian source has, for its part, a luminance independent of the point considered on the surface of the emitter and of the observation angle inside the solid angle containing all rays.
- the image focus of the wavy-face lens is preferably at infinity.
- the invention makes it possible, thanks to the appropriate corrugated face of the lens, to obtain a beam, in particular a complementary highway beam, relatively thin and spread out, which is not in the shape of a "banana” and which, overlapping with a beam. code, gives satisfactory luminous homogeneity.
- the lens has a basic geometric surface, which surface is fictitious, corresponding in particular to an exit face of a strictly stigmatic lens.
- the corrugated face of the lens comprises undulations of variable slope, this slope being measured with respect to the base geometric surface, this slope preferably being all the greater the further the corrugation is from a center of the lens. , so as to produce a single zone of maximum illumination in the complementary beam, and no zones of secondary maxima.
- the invention thus makes it possible to avoid the appearance, in the complementary beam, of distinct light spots (liable to cause discomfort for the driver of the vehicle). This makes it possible to make this complementary beam relatively homogeneous.
- the optical unit has an optical axis, and each corrugation is formed on a stripe, this stripe preferably extending in a substantially rectilinear manner when the lens is observed along the axis. optical.
- the corrugations are substantially parallel to each other.
- the amplitude of the undulations increases as the undulation considered is further from the center of the lens.
- This amplitude is preferably measured relative to the basic geometric surface (which is fictitious) of the lens.
- the lens is arranged to give, from a punctual light point located at its object focal point, a substantially horizontal light line when the corrugations of the lens are placed in a substantially vertical manner.
- the lens is made in one piece.
- the corrugated face of the lens is arranged as the light exit face.
- the light source comprises an LED (light-emitting diode) with a flat light emitter, the plane of this emitter advantageously extending in an inclined manner relative to the optical axis.
- the plane of the emitter is neither perpendicular nor parallel to the optical axis.
- the object focal point of the lens is placed substantially at the center of a lower edge of the emitter of the light source.
- the lens has a substantially circular, or rectangular or trapezoidal, periphery when it is observed along the optical axis.
- the optical unit has a top and a bottom when in place on the vehicle.
- This unit may further include a reflector placed in the unit, in order to intercept at least a part of the light rays coming from the light source so as to create an upwardly spread and defocused image, which image, projected and spread out. through the lens, completes the complementary beam downwards.
- a reflector placed in the unit, in order to intercept at least a part of the light rays coming from the light source so as to create an upwardly spread and defocused image, which image, projected and spread out. through the lens, completes the complementary beam downwards.
- the optical unit has an axis transverse to the optical axis and extending substantially horizontally when the unit is mounted on the vehicle, and the reflector has a shape substantially in sector cylinder of transverse axis.
- the reflector has a front edge located between the lens and the light source.
- the motorway beam has a horizontal cut located between a horizontal plane and a plane inclined 0.57 ° down, to the left or to the right of the optical axis, depending on the type of traffic (traffic on the right or on the left respectively ).
- This cut-off line is preferably located in a plane inclined 0.29 ° downwards.
- This motorway beam may in particular have a maximum intensity that is 80% higher than a conventional code using a source of the same type.
- the device is arranged so that the additional beam is switched on only when the vehicle is traveling at a speed greater than a predetermined (non-zero) threshold, this threshold being for example substantially equal to 110 km / h.
- the device according to the invention can be unconditionally activated on the motorway.
- an optical unit 1 for a motor vehicle lighting device D arranged to produce a complementary light beam FC intended to be used with a main light beam produced by another optical unit 30, this complementary beam FC having a cut C substantially flat (see cut C on the figures 5 and 8 ).
- the optical unit 30 can optionally be LED.
- the complementary FC beam may be a relatively thin and spread freeway complementary beam which is not "banana" shaped, and the main beam may be a code beam.
- the device In a variant not shown, it is possible to arrange the device to allow it to produce a bad weather beam, for example of class W.
- the cut C is formed by lateral edges BL which are straightened, namely substantially parallel to a horizontal line, and not falling with respect to this horizontal line.
- the lens 3 has a basic geometric surface SB, a surface which is fictitious, corresponding in particular to an exit face of a strictly stigmatic lens (see figure 2 ).
- the corrugated face 4 of the lens 3 comprises corrugations 5 of variable slope, this slope being measured with respect to the basic geometric surface SB, this slope being all the greater the further the corrugation 5 is from a center CO of the lens, so as to produce a single zone of maximum illumination ZMax in the complementary beam FC (see figures 5 and 8 ).
- the invention thus makes it possible to avoid the appearance, in the complementary beam FC, of several local illumination maxima and therefore of distinct light spots (liable to cause discomfort for the driver of the vehicle).
- the invention thus makes it possible to make this complementary FC beam relatively homogeneous.
- the optical unit has an optical axis Ox (see figure 6 ), and each corrugation 5 is formed on a ridge 7 of the lens 3, each ridge 7 extending substantially rectilinearly when the lens 3 is observed along the optical axis Ox.
- the corrugations 5 are substantially parallel to each other.
- the amplitude of the corrugations 5 increases as the considered corrugation is moved away from the center CO of the lens 3.
- This amplitude is preferably measured relative to the basic geometric surface SB (which is fictitious) of lens 3.
- the lens 3 is arranged to give, from a punctual light point situated at its object focal point F, a substantially horizontal line of light when the corrugations of the lens are placed in a substantially vertical manner.
- the corrugated face 4 of the lens 3 is arranged, in the unit 1, as the light exit face.
- the other face 9 of the lens 3, opposite to the face 4, is for example planar. This makes it possible in particular to significantly reduce aberrations.
- H is the angle of a direction of observation of the beam with a vertical plane containing the optical axis.
- M [X, Y, Z] F (u, v) be a parametric equation of the exit surface 4 of the basic stigmatic lens (equation which can be established by those skilled in the art for a print, a face entry and a given material; in the following example the draft is 70 mm, the entry face is flat and the material is PMMA).
- x axis optical axis
- z axis vertical.
- the modulation function ⁇ x is then such that the deviations are greater on the side corresponding to the zones of the lens 3 that are furthest from the axis (and then receiving less flux).
- the LED 2 has a flat light emitter 10, the plane of this emitter 10 extending inclined relative to the optical axis Ox, as can be seen in the figure. figure 6 .
- the plane of the emitter 10 is neither perpendicular nor parallel to the optical axis.
- the object focal point F of the lens 3 is placed substantially in the center of a lower edge 11 of the emitter 10 of the light source 2.
- the lens 3 has a substantially circular periphery 12.
- the optical unit has a top and a bottom when in place on the vehicle.
- This unit 1 further comprises, in order in particular to improve the fusion of the main and complementary beams, a reflector 15 placed in the unit 1, in order to intercept at least part of the light rays coming from the emitter 10 of the light source. 2 so as to create an image spread upwards and defocused towards the rear, an image which, projected and spread by the lens, completes the complementary beam downwards (see figure 8 ).
- the rear edge 21 of the reflector 15 defines with the upper edge of the emitter 10 a non-zero distance d, which in the example described, depends on the encapsulation of the LED. This distance d is characteristic of the zone of the emitter 10 which is hidden from the reflector 15.
- the optical unit 1 has an axis Oy transverse to the optical axis Ox and extending substantially horizontally when the unit 1 is mounted on the vehicle.
- the reflector 15 has a shape substantially in the form of a cylinder sector of transverse axis Oy.
- the reflector 15 has a front edge 22 located between the lens 3 and the light source 2.
- the reflector 15 is placed so as not to hide the bottom of the emitter 10, which must be seen from the entire entrance face 9 of the lens 3 (so as not to reduce the intensity under the cut) and so as to cover a fraction of the top of the emitter 10 (seen from the entrance face 9 of the lens) to allow a good fusion of the beam that it creates and the main beam (in direct light ).
- This reflector 15 can thus take the form of a cylinder of transverse axis Oy, longer than the emitter.
- the cross section of the cylinder can be a parabola or a spline curve, for example of degree 3, which approaches it (and allows, by adjusting the tensions at its ends, to adjust the shape of the beam).
- the device is arranged so that the additional beam is switched on only when the vehicle is traveling at a speed greater than a predetermined (non-zero) threshold, this threshold being for example substantially equal to 110 km / h.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Optics & Photonics (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Description
L'invention concerne notamment une unité optique, notamment pour dispositif de signalisation et/ou d'éclairage pour véhicule automobile. Une telle unité optique est par exemple connue du document
On connaît par la demande de brevet
La présente invention vise notamment à éviter ce type d'inconvénient.The present invention aims in particular to avoid this type of drawback.
L'invention a ainsi pour objet une unité optique comprenant les caractéristiques de la revendication 1.The subject of the invention is thus an optical unit comprising the characteristics of claim 1.
Par « source isotrope », on entend une source dont l'intensité est indépendante de l'angle d'observation, à l'intérieur de l'angle solide contenant tous ses rayons.The term “isotropic source” means a source whose intensity is independent of the angle of observation, inside the solid angle containing all of its rays.
Une source lambertienne a, quant à elle, une luminance indépendante du point considéré à la surface de l'émetteur et de l'angle d'observation à l'intérieur de l'angle solide contenant tous rayons.A Lambertian source has, for its part, a luminance independent of the point considered on the surface of the emitter and of the observation angle inside the solid angle containing all rays.
Le foyer image de la lentille à face ondulée est de préférence à l'infini.The image focus of the wavy-face lens is preferably at infinity.
L'invention permet, grâce à la face ondulée appropriée de la lentille, d'obtenir un faisceau, notamment un faisceau complémentaire autoroute, relativement mince et étalé, qui ne soit pas en forme de « banane » et qui, en recouvrement avec un faisceau code, donne une homogénéité lumineuse satisfaisante.The invention makes it possible, thanks to the appropriate corrugated face of the lens, to obtain a beam, in particular a complementary highway beam, relatively thin and spread out, which is not in the shape of a "banana" and which, overlapping with a beam. code, gives satisfactory luminous homogeneity.
De préférence, la lentille présente une surface géométrique de base, surface qui est fictive, correspondant notamment à une face de sortie d'une lentille rigoureusement stigmatique.Preferably, the lens has a basic geometric surface, which surface is fictitious, corresponding in particular to an exit face of a strictly stigmatic lens.
Avantageusement la face ondulée de la lentille comporte des ondulations de pente variable, cette pente étant mesurée par rapport à la surface géométrique de base, cette pente étant de préférence d'autant plus grande que l'ondulation est éloignée d'un centre de la lentille, de manière à produire une seule zone d'éclairement maximal dans le faisceau complémentaire, et pas de zones de maxima secondaires.Advantageously, the corrugated face of the lens comprises undulations of variable slope, this slope being measured with respect to the base geometric surface, this slope preferably being all the greater the further the corrugation is from a center of the lens. , so as to produce a single zone of maximum illumination in the complementary beam, and no zones of secondary maxima.
L'invention permet ainsi d'éviter l'apparition, dans le faisceau complémentaire, de tâches lumineuses distinctes (susceptibles d'occasionner des gênes pour le conducteur du véhicule). Ceci permet de rendre ce faisceau complémentaire relativement homogène.The invention thus makes it possible to avoid the appearance, in the complementary beam, of distinct light spots (liable to cause discomfort for the driver of the vehicle). This makes it possible to make this complementary beam relatively homogeneous.
Dans un exemple de mise en oeuvre de l'invention, l'unité optique présente un axe optique, et chaque ondulation est formée sur une strie, cette strie s'étendant de préférence de manière sensiblement rectiligne lorsque la lentille est observée suivant l'axe optique.In an exemplary embodiment of the invention, the optical unit has an optical axis, and each corrugation is formed on a stripe, this stripe preferably extending in a substantially rectilinear manner when the lens is observed along the axis. optical.
Avantageusement les ondulations sont sensiblement parallèles entre elles.Advantageously, the corrugations are substantially parallel to each other.
Le cas échéant, l'amplitude des ondulations est croissante au fur et à mesure que l'ondulation considérée est éloignée du centre de la lentille.Where appropriate, the amplitude of the undulations increases as the undulation considered is further from the center of the lens.
Cette amplitude est de préférence mesurée par rapport à la surface géométrique de base (qui est fictive) de la lentille.This amplitude is preferably measured relative to the basic geometric surface (which is fictitious) of the lens.
Dans un exemple de mise en oeuvre de l'invention, la lentille est agencée pour donner, d'un point lumineux ponctuel situé à son foyer objet, une ligne lumineuse sensiblement horizontale lorsque les ondulations de la lentille sont placées de manière sensiblement verticale.In an exemplary embodiment of the invention, the lens is arranged to give, from a punctual light point located at its object focal point, a substantially horizontal light line when the corrugations of the lens are placed in a substantially vertical manner.
Si on le souhaite, la lentille est réalisée d'un seul tenant.If desired, the lens is made in one piece.
Le cas échéant, la face ondulée de la lentille est agencée comme face de sortie de la lumière.Where appropriate, the corrugated face of the lens is arranged as the light exit face.
Dans un exemple de mise en oeuvre de l'invention, la source de lumière comporte une LED (diode électroluminescente) à émetteur lumineux plan, le plan de cet émetteur s'étendant avantageusement de manière inclinée par rapport à l'axe optique. De préférence, le plan de l'émetteur n'est ni perpendiculaire ni parallèle à l'axe optique.In an exemplary implementation of the invention, the light source comprises an LED (light-emitting diode) with a flat light emitter, the plane of this emitter advantageously extending in an inclined manner relative to the optical axis. Preferably, the plane of the emitter is neither perpendicular nor parallel to the optical axis.
Avantageusement le foyer objet de la lentille est placé sensiblement au centre d'un bord inférieur de l'émetteur de la source de lumière.Advantageously, the object focal point of the lens is placed substantially at the center of a lower edge of the emitter of the light source.
Le cas échéant, la lentille présente un pourtour sensiblement circulaire, ou rectangulaire ou trapézoïdal, lorsqu'elle est observée suivant l'axe optique.Where appropriate, the lens has a substantially circular, or rectangular or trapezoidal, periphery when it is observed along the optical axis.
L'unité optique présente un haut et un bas lorsqu'elle est en place sur le véhicule.The optical unit has a top and a bottom when in place on the vehicle.
Cette unité peut comporter en outre un réflecteur placé dans l'unité, afin d'intercepter au moins une partie des rayons lumineux provenant de la source de lumière de manière à créer une image étalée vers le haut et défocalisée, image qui, projetée et étalée par la lentille, vient compléter le faisceau complémentaire vers le bas.This unit may further include a reflector placed in the unit, in order to intercept at least a part of the light rays coming from the light source so as to create an upwardly spread and defocused image, which image, projected and spread out. through the lens, completes the complementary beam downwards.
Dans un exemple de mise en oeuvre de l'invention, l'unité optique présente un axe transversal à l'axe optique et s'étendant sensiblement horizontalement lorsque l'unité est montée sur le véhicule, et le réflecteur présente une forme sensiblement en secteur de cylindre d'axe transversal.In an exemplary embodiment of the invention, the optical unit has an axis transverse to the optical axis and extending substantially horizontally when the unit is mounted on the vehicle, and the reflector has a shape substantially in sector cylinder of transverse axis.
Avantageusement le réflecteur comporte un bord avant situé entre la lentille et la source de lumière.Advantageously, the reflector has a front edge located between the lens and the light source.
L'invention a également pour objet un dispositif d'éclairage et/ou de signalisation, notamment de véhicule automobile, comportant :
- une unité optique principale capable de produire un faisceau de lumière principal, notamment un faisceau de croisement,
- une unité optique telle que définie ci-dessus, capable de produire un faisceau complémentaire présentant une coupure sensiblement plate, les faisceaux principal et complémentaire formant un faisceau global, ce faisceau global étant notamment un faisceau autoroute de portée de préférence supérieure ou égale à 100 mètres.
- a main optical unit capable of producing a main beam of light, in particular a passing beam,
- an optical unit as defined above, capable of producing a complementary beam having a substantially flat cut-off, the main and complementary beams forming an overall beam, this overall beam being in particular a highway beam with a range preferably greater than or equal to 100 meters .
Par exemple, le faisceau autoroute présente une coupure horizontale située entre un plan horizontal et un plan incliné de 0.57° vers le bas, à gauche ou à droite de l'axe optique, suivant le type de trafic (trafic à droite ou à gauche respectivement). Cette ligne de coupure est de préférence située dans un plan incliné de 0.29° vers le bas. Ce faisceau autoroute peut réglementairement présenter notamment une intensité maximum plus élevée de 80% qu'un code classique utilisant une source de même nature.For example, the motorway beam has a horizontal cut located between a horizontal plane and a plane inclined 0.57 ° down, to the left or to the right of the optical axis, depending on the type of traffic (traffic on the right or on the left respectively ). This cut-off line is preferably located in a plane inclined 0.29 ° downwards. This motorway beam may in particular have a maximum intensity that is 80% higher than a conventional code using a source of the same type.
Dans un exemple de mise en oeuvre de l'invention, le dispositif est agencé de manière à ce que le faisceau complémentaire soit allumé seulement lorsque le véhicule roule à une vitesse supérieure à un seuil prédéterminé (non nul), ce seuil étant par exemple sensiblement égal à 110 km/h.In an exemplary implementation of the invention, the device is arranged so that the additional beam is switched on only when the vehicle is traveling at a speed greater than a predetermined (non-zero) threshold, this threshold being for example substantially equal to 110 km / h.
Dans le cas où le véhicule dispose d'un système de navigation permettant de connaître le type de route sur lequel il circule, le dispositif selon l'invention peut être inconditionnellement activé sur autoroute.In the case where the vehicle has a navigation system making it possible to know the type of road on which it is traveling, the device according to the invention can be unconditionally activated on the motorway.
L'invention a encore pour objet un procédé pour produire un faisceau lumineux, notamment un faisceau autoroute, pour véhicule automobile, notamment à l'aide d'une unité optique telle définie ci-dessus, ce procédé comportant l'étape suivante :
- générer un faisceau complémentaire à coupure sensiblement plate et ayant une unique zone d'éclairement maximal.
- generating a complementary beam with a substantially flat cut-off and having a single zone of maximum illumination.
L'invention pourra être mieux comprise à la lecture de la description détaillée qui va suivre, d'un exemple de mise en œuvre non limitatif de l'invention, et à l'examen du dessin annexé, sur lequel :
- la
figure 1 illustre, schématiquement et partiellement, différents éléments d'une unité optique conforme à un exemple de mise en œuvre de l'invention, - la
figure 2 représente, schématiquement et partiellement, le profil géométrique en coupe de la lentille de l'unité de lafigure 1 , - les
figures 3 et 4 illustrent la variation de grandeurs caractéristiques du profil de la lentille de l'unité de lafigure 1 , - la
figure 5 représente, schématiquement et partiellement, intercepté par un écran perpendiculaire à l'axe optique, un faisceau obtenu grâce à la lentille de l'unité de lafigure 1 , sans la présence du réflecteur, - les
figures 6 et 7 représentent, schématiquement et partiellement, en coupe, l'émetteur et le réflecteur de l'unité optique de lafigure 1 , et - la
figure 8 représente, schématiquement et partiellement, intercepté par un écran perpendiculaire à l'axe optique, un faisceau obtenu grâce à la lentille de l'unité de lafigure 1 , avec la présence du réflecteur.
- the
figure 1 illustrates, schematically and partially, various elements of an optical unit in accordance with an exemplary implementation of the invention, - the
figure 2 represents, schematically and partially, the geometric profile in section of the lens of the unit of thefigure 1 , - the
figures 3 and 4 illustrate the variation of characteristic quantities of the profile of the lens of the unit of thefigure 1 , - the
figure 5 represents, schematically and partially, intercepted by a screen perpendicular to the optical axis, a beam obtained thanks to the lens of the unit of thefigure 1 , without the presence of the reflector, - the
figures 6 and 7 represent, schematically and partially, in section, the emitter and the reflector of the optical unit of thefigure 1 , and - the
figure 8 represents, schematically and partially, intercepted by a screen perpendicular to the optical axis, a beam obtained thanks to the lens of the unit of thefigure 1 , with the presence of the reflector.
On a représenté sur la
L'unité optique 30 peut éventuellement être à LED.The
Le faisceau complémentaire FC peut être un faisceau complémentaire autoroute, relativement mince et étalé, qui ne soit pas en forme de « banane », et le faisceau principal peut être un faisceau code.The complementary FC beam may be a relatively thin and spread freeway complementary beam which is not "banana" shaped, and the main beam may be a code beam.
Dans une variante non illustrée, il est possible d'agencer le dispositif pour lui permettre de produire un faisceau de mauvais temps, par exemple de classe W.In a variant not shown, it is possible to arrange the device to allow it to produce a bad weather beam, for example of class W.
Cette unité 1 comporte :
- une source de
lumière 2 à émission lumineuse sensiblement isotrope ou lambertienne, formée dans l'exemple décrit par une LED, - une
lentille 3 présentant un foyer objet F et un foyer image, ce foyer image étant à l'infini, cettelentille 3 étant associée à la source delumière 2 pour produire le faisceau complémentaire FC, cette lentille comportant une face ondulée 4, de forme différente d'une face de lentille stigmatique pure, agencée pour obtenir le faisceau complémentaire FC.
- a
light source 2 with substantially isotropic or Lambertian light emission, formed in the example described by an LED, - a
lens 3 having an object focus F and an image focus, this image focus being at infinity, thislens 3 being associated with thelight source 2 to produce the complementary beam FC, this lens comprising acorrugated face 4, of the shape different from a pure stigmatic lens face, arranged to obtain the complementary FC beam.
Comme on le voit sur les
La lentille 3 présente une surface géométrique de base SB, surface qui est fictive, correspondant notamment à une face de sortie d'une lentille rigoureusement stigmatique (voir
La face ondulée 4 de la lentille 3 comporte des ondulations 5 de pente variable, cette pente étant mesurée par rapport à la surface géométrique de base SB, cette pente étant d'autant plus grande que l'ondulation 5 est éloignée d'un centre CO de la lentille, de manière à produire une seule zone d'éclairement maximal ZMax dans le faisceau complémentaire FC (voir
L'invention permet ainsi d'éviter l'apparition, dans le faisceau complémentaire FC, de plusieurs maxima locaux d'éclairement et donc de tâches lumineuses distinctes (susceptibles d'occasionner des gênes pour le conducteur du véhicule). L'invention permet ainsi de rendre ce faisceau complémentaire FC relativement homogène.The invention thus makes it possible to avoid the appearance, in the complementary beam FC, of several local illumination maxima and therefore of distinct light spots (liable to cause discomfort for the driver of the vehicle). The invention thus makes it possible to make this complementary FC beam relatively homogeneous.
Dans l'exemple considéré, l'unité optique présente un axe optique Ox (voir
Les ondulations 5 sont sensiblement parallèles entre elles.The
L'amplitude des ondulations 5 est croissante au fur et à mesure que l'ondulation considérée est éloignée du centre CO de la lentille 3.The amplitude of the
Cette amplitude est de préférence mesurée par rapport à la surface géométrique de base SB (qui est fictive) de la lentille 3.This amplitude is preferably measured relative to the basic geometric surface SB (which is fictitious) of
La lentille 3 est agencée pour donner, d'un point lumineux ponctuel situé à son foyer objet F, une ligne lumineuse sensiblement horizontale lorsque les ondulations de la lentille sont placées de manière sensiblement verticale.The
La face ondulée 4 de la lentille 3 est agencée, dans l'unité 1, comme face de sortie de la lumière.The
L'autre face 9 de la lentille 3, opposée à la face 4, est par exemple plane. Ceci permet notamment de réduire sensiblement les aberrations.The
La lentille 3 (dont la surface géométrique fictive de base SB définit une lentille stigmatique) reçoit sur sa face de sortie 4 les modulations 5, lesquelles ne dépendent que de la coordonnée latérale et varient de telle sorte que les quantités de flux lumineux déviées vers la gauche et la droite soient équilibrées (afin d'éviter que les demies lentilles gauche et droite aient des maxima d'intensité lumineuse décalés par rapport à H = 0, ce qui donnerait un faisceau total inhomogène avec deux maxima d'intensité, de part et d'autre de H = 0).The lens 3 (whose base fictitious geometric surface SB defines a stigmatic lens) receives on its
H est l'angle d'une direction d'observation du faisceau avec un plan vertical contenant l'axe optique.H is the angle of a direction of observation of the beam with a vertical plane containing the optical axis.
Soit M[X,Y,Z]=F(u,v) une équation paramétrique de la surface de sortie 4 de la lentille stigmatique de base (équation pouvant être établie par l'homme de l'art pour un tirage, une face d'entrée et un matériau donnés ; dans l'exemple qui suit le tirage est de 70 mm, la face d'entrée est plane et le matériau est du PMMA).Let M [X, Y, Z] = F (u, v) be a parametric equation of the
On considère : axe des x = axe optique, axe des z = verticale.We consider: x axis = optical axis, z axis = vertical.
L'équation de la face de sortie 4 de la lentille 3 de l'invention est de la forme
La fonction de modulation δ x est alors telle que les déviations soient plus grandes du côté correspondant aux zones de la lentille 3 les plus éloignées de l'axe (et recevant alors moins de flux).The modulation function δ x is then such that the deviations are greater on the side corresponding to the zones of the
La fonction simple suivante (représentée graphiquement sur la
Il convient de noter qu'une modulation sinusoïdale simple ne conviendrait pas car la condition (*) ci-dessus ne serait pas respectée (on obtiendrait alors deux maxima locaux de part et d'autre du plan H=0).It should be noted that a simple sinusoidal modulation would not be suitable because the condition (*) above would not be respected (we would then obtain two local maxima on either side of the plane H = 0).
La LED 2 est à émetteur 10 lumineux plan, le plan de cet émetteur 10 s'étendant de manière inclinée par rapport à l'axe optique Ox, comme on peut le voir sur la
Le foyer objet F de la lentille 3 est placé sensiblement au centre d'un bord inférieur 11 de l'émetteur 10 de la source de lumière 2.The object focal point F of the
Dans l'exemple décrit, la lentille 3 présente un pourtour 12 sensiblement circulaire.In the example described, the
L'unité optique présente un haut et un bas lorsqu'elle est en place sur le véhicule.The optical unit has a top and a bottom when in place on the vehicle.
Cette unité 1 comporte en outre, pour notamment améliorer la fusion des faisceaux principal et complémentaire, un réflecteur 15 placé dans l'unité 1, afin d'intercepter au moins une partie des rayons lumineux provenant de l'émetteur 10 de la source de lumière 2 de manière à créer une image étalée vers le haut et défocalisée vers l'arrière, image qui, projetée et étalée par la lentille, vient compléter le faisceau complémentaire vers le bas (voir
Le bord arrière 21 du réflecteur 15 définit avec le bord supérieur de l'émetteur 10 une distance d non nulle, qui dans l'exemple décrit, dépend de l'encapsulation de la LED. Cette distance d est caractéristique de la zone de l'émetteur 10 qui est cachée vis-à-vis du réflecteur 15.The
Dans l'exemple décrit, l'unité optique 1 présente un axe Oy transversal à l'axe optique Ox et s'étendant sensiblement horizontalement lorsque l'unité 1 est montée sur le véhicule.In the example described, the optical unit 1 has an axis Oy transverse to the optical axis Ox and extending substantially horizontally when the unit 1 is mounted on the vehicle.
Le réflecteur 15 présente une forme sensiblement en secteur de cylindre d'axe transversal Oy.The
Le réflecteur 15 comporte un bord avant 22 situé entre la lentille 3 et la source de lumière 2.The
Dans l'exemple considéré, le réflecteur 15 est placé de manière à ne pas cacher le bas de l'émetteur 10, qui doit être vu depuis toute la face d'entrée 9 de la lentille 3 (afin de ne pas diminuer l'intensité sous la coupure) et de manière à recouvrir une fraction du haut de l'émetteur 10 (vu depuis la face d'entrée 9 de la lentille) pour permettre une bonne fusion du faisceau qu'il crée et du faisceau principal (en lumière directe).In the example considered, the
Ce réflecteur 15 peut ainsi prendre la forme d'un cylindre d'axe transverse Oy, plus long que l'émetteur. La section droite du cylindre peut être une parabole ou une courbe spline par exemple de degré 3 qui l'approche (et permet, par le réglage des tensions à ses extrémités, d'ajuster la forme du faisceau).This
Pour la section droite du réflecteur 15, il est possible de prendre un arc parabolique de même foyer que la lentille 3, passant par P et arrêté sur, ou un peu avant, la ligne limite ou une spline (voir
Dans un exemple de mise en oeuvre de l'invention, le dispositif est agencé de manière à ce que le faisceau complémentaire soit allumé seulement lorsque le véhicule roule à une vitesse supérieure à un seuil prédéterminé (non nul), ce seuil étant par exemple sensiblement égal à 110 km/h.In an exemplary implementation of the invention, the device is arranged so that the additional beam is switched on only when the vehicle is traveling at a speed greater than a predetermined (non-zero) threshold, this threshold being for example substantially equal to 110 km / h.
Claims (14)
- Optical unit, especially for a motor-vehicle signalling and/or lighting device, said unit being arranged to produce a complementary light beam (FC) intended to be used with a main light beam, this complementary beam having a substantially flat cutoff (C), characterized in that this unit comprises:- at least one light source (2) the light emission of which is substantially isotropic or Lambertian, especially an LED,- at least one lens (3) associated with this light source so as to participate in the production of the complementary beam, this lens comprising a corrugated face arranged to obtain the complementary beam, the cutoff (C) of which is formed by lateral edges (BL) that are rectified, i.e. substantially parallel to a horizontal line, and that do not slope downwards with respect to this horizontal line.
- Unit according to the preceding claim, characterized in that the lens has a base geometric surface (SB) especially corresponding to an exit face of a rigorously stigmatic lens, and characterized in that the corrugated face (4) of the lens comprises corrugations (5) of variable slope, this slope being measured with respect to the base geometric surface, this slope preferably increasing with the distance of the corrugation from a centre of the lens, so as to produce a single region (ZMax) of maximum illuminance in the complementary beam.
- Unit according to the preceding claim, the unit having an optical axis (Ox), characterized in that each corrugation is formed on a line (7), this line preferably extending substantially rectilinearly when the lens is observed along the optical axis.
- Unit according to one of the two preceding claims, characterized in that the amplitude of the corrugations (5) increases as the distance of the corrugation in question from the centre (CO) of the lens increases.
- Unit according to one of the three preceding claims, characterized in that the lens (3) is arranged to form, from a discrete luminous point located at its object focal point, a substantially horizontal luminous line when the corrugations of the lens are placed substantially vertically.
- Unit according to one of the four preceding claims, characterized in that the corrugated face (4) of the lens is arranged as exit face of the light.
- Unit according to one of the preceding claims, characterized in that the light source comprises a planar LED light emitter (10), the plane of this emitter advantageously extending in an inclined manner with respect to the optical axis (Ox).
- Unit according to one of the preceding claims, characterized in that the object focal point (F) of the lens is placed at the centre of a lower edge (11) of the emitter of the light source.
- Unit according to one of the preceding claims, the unit having a top and a bottom when it is placed in the vehicle, characterized in that it furthermore comprises a reflector (15) placed in the unit, in order to intercept at least some of the light rays originating from the light source so as to create an image that is spread upwards and defocused, which image, once projected and spread by the lens, completes the bottom of the complementary beam.
- Unit according to the preceding claim, having an axis (Oy) transverse to the optical axis and extending substantially horizontally when the unit is mounted in the vehicle, characterized in that the reflector (15) is substantially in the shape of a cylinder sector of transverse axis (y).
- Unit according to one of the two preceding claims, characterized in that the reflector comprises a front edge (22) located between the lens and the light source.
- Lighting and/or signalling device, especially for a motor vehicle, said device comprising:- a main optical unit (30) capable of producing a main light beam, especially a low beam,- an optical unit (1) according to one of the preceding claims, capable of producing a complementary beam (FC) having a substantially flat cutoff, the main and complementary beams forming an overall beam, this overall beam especially being a motorway beam, of range preferably longer than or equal to 100 metres.
- Device according to the preceding claim, characterized in that it is arranged so that the complementary beam is turned on only when the vehicle is being driven at a speed higher than a preset (nonzero) threshold, this threshold for example being substantially equal to 110 km/h.
- Method for producing a light beam, especially a motorway beam, for a motor vehicle, using an optical unit (10) according to one of Claims 1 to 11, this method comprising the following step:- generating a complementary beam comprising a substantially flat cutoff and having a single region of maximum illuminance.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1151212A FR2971464B1 (en) | 2011-02-15 | 2011-02-15 | OPTICAL UNIT FOR SIGNALING AND / OR LIGHTING DEVICE |
Publications (2)
Publication Number | Publication Date |
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EP2489925A1 EP2489925A1 (en) | 2012-08-22 |
EP2489925B1 true EP2489925B1 (en) | 2021-10-20 |
Family
ID=45566948
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12155491.9A Active EP2489925B1 (en) | 2011-02-15 | 2012-02-15 | Optical unit for a signalling and / or lighting device |
Country Status (2)
Country | Link |
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EP (1) | EP2489925B1 (en) |
FR (1) | FR2971464B1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2986621B1 (en) * | 2012-01-12 | 2015-01-23 | Valeo Vision | LENS FOR OPTICAL MODULE OF MOTOR VEHICLE |
FR3004786B1 (en) * | 2013-04-17 | 2017-09-08 | Valeo Vision | LENS, OPTICAL MODULE AND LIGHTING AND / OR SIGNALING DEVICE FOR MOTOR VEHICLE |
FR3051537B1 (en) * | 2016-05-18 | 2018-06-29 | Valeo Vision | DIOPTER RECTIFIER |
DE112018000084A5 (en) * | 2017-03-29 | 2019-05-09 | Docter Optics Se | Headlight lens for a motor vehicle headlight |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3578966A (en) * | 1969-11-05 | 1971-05-18 | Sylvania Electric Prod | Vehicle driving light |
DE10226471B4 (en) * | 2002-06-14 | 2007-03-22 | Schott Ag | Optical lens with soft-focus effect |
JP4921372B2 (en) * | 2004-09-20 | 2012-04-25 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | LED collimator element with semi-parabolic reflector |
DE202005004080U1 (en) * | 2005-03-14 | 2005-07-07 | Zizala Lichtsysteme Gmbh | Lens for vehicle headlamp has laterally adjacent elongated recesses and/or raised sections extending essentially from above downwards along surface of optical element on convex front side of lens |
EP1762776B1 (en) | 2005-09-09 | 2015-04-15 | Valeo Vision | Method for the manufacturing of a module or a vehicle headlamp |
DE102006007450B4 (en) * | 2006-02-17 | 2016-10-06 | Automotive Lighting Reutlingen Gmbh | Lighting device in a vehicle |
US7563008B2 (en) * | 2006-03-28 | 2009-07-21 | Visteon Global Technologies, Inc. | LED projector headlamps using single or multi-faceted lenses |
FR2913750A1 (en) * | 2007-03-14 | 2008-09-19 | Valeo Vision Sa | OPTICAL MODULE FOR MOTOR VEHICLE PROJECTOR |
-
2011
- 2011-02-15 FR FR1151212A patent/FR2971464B1/en active Active
-
2012
- 2012-02-15 EP EP12155491.9A patent/EP2489925B1/en active Active
Non-Patent Citations (1)
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None * |
Also Published As
Publication number | Publication date |
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FR2971464A1 (en) | 2012-08-17 |
FR2971464B1 (en) | 2014-11-28 |
EP2489925A1 (en) | 2012-08-22 |
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