EP3628915B1 - Single-piece optical part made of transparent or translucent material with inactive surface with diffusing portion - Google Patents

Single-piece optical part made of transparent or translucent material with inactive surface with diffusing portion Download PDF

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Publication number
EP3628915B1
EP3628915B1 EP19195640.8A EP19195640A EP3628915B1 EP 3628915 B1 EP3628915 B1 EP 3628915B1 EP 19195640 A EP19195640 A EP 19195640A EP 3628915 B1 EP3628915 B1 EP 3628915B1
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EP
European Patent Office
Prior art keywords
optical part
rays
variation
inactive
light
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Active
Application number
EP19195640.8A
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German (de)
French (fr)
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EP3628915A1 (en
Inventor
Yves Gromfeld
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Valeo Vision SAS
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Valeo Vision SAS
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Classifications

    • 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
    • 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
    • F21S41/285—Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24 - F21S41/2805
    • 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]
    • 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
    • F21S41/148—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device the main emission direction of the LED being perpendicular to the optical axis
    • 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]
    • F21S41/151—Light emitting diodes [LED] arranged in one or more lines
    • 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
    • F21S41/27—Thick lenses
    • 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
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • 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
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/322—Optical layout thereof the reflector using total internal reflection
    • 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
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/36—Combinations of two or more separate reflectors
    • F21S41/365—Combinations of two or more separate reflectors successively reflecting the light
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/008—Combination of two or more successive refractors along an optical axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the present invention relates to the field of light devices, in particular for motor vehicles, in which a one-piece optical part made of transparent or translucent material is used to guide the light and/or shape the corresponding light beam.
  • such an optical part comprises active surfaces, which are arranged specifically so as to guide and deflect the light rays, in particular by total internal reflection or by refraction.
  • active surfaces which are arranged specifically so as to guide and deflect the light rays, in particular by total internal reflection or by refraction.
  • a dipped beam emits a beam of illumination of the road having a cut-off above which practically no beam is sent, making it possible to avoid the dazzling of vehicles being followed or coming in the opposite direction. It is therefore all the more important in this case to avoid parasitic rays which would reach above the cut-off and risk dazzling the drivers of these vehicles.
  • a technical problem which the present invention aims to solve is therefore to avoid the formation of stray rays in the light beam produced by a light device by means of an optical part made of transparent material.
  • a first object of the invention is a one-piece optical part according to claim 1.
  • these parasitic rays are eliminated and/or the effect of these parasitic rays is reduced, for example by spreading them forward. Undesirable light concentrations in the beam are thus reduced.
  • Another object of the invention is a vehicle lighting device, in particular a headlamp, comprising an optical part according to the invention and at least one light source emitting its rays essentially towards said input diopter.
  • the light source can be a light-emitting diode, also called LED or more commonly LED (for Light Emitting Diode in English)
  • the invention also relates to a vehicle comprising a vehicle lighting and/or signaling device according to the invention, in particular connected to the vehicle's power supply.
  • the figures 1 to 3 illustrate an optical part 1 according to a first embodiment of the invention.
  • This is a one-piece optical part 1, made of transparent or translucent material, in particular polycarbonate (PC).
  • PC polycarbonate
  • the optical part 1 comprises a first plurality of collimators 2' and a second plurality of collimators 2".
  • Each of these collimators 2', 2" comprises an input dioptre 2, intended to receive the light rays r1, r2, r3 emitted by a light source 21, intended to be placed here opposite and close to the free end of the corresponding collimator 2′, 2′′, at the top while illuminating downwards in this example.
  • the light source is a light-emitting diode, also called LED 21.
  • the first plurality of collimators here comprises two collimators 2', which are each optically coupled to a reflection member 3, which is itself optically coupled to a switching member 4, itself coupled to an output member 5. These different elements are therefore coupled together and arranged so as to shape the light rays emitted by the light sources 21 so as to form a cut-off beam.
  • Each collimator 2' is arranged to send, here by refraction and total internal reflection, the light rays r1, r2, r3 emitted by the LED 21, in a more concentrated beam, in the direction of the reflection member 3.
  • This reflection member 3 is here an optical interface arranged so as to reflect by total internal reflection these rays r1, r2, r3 towards the switching device 4, more particularly towards the edge 4a of this switching device 4.
  • the reflection member 4 can reflect these rays r1, r2, r3 towards a focal zone arranged at this edge 4a.
  • This exit diopter 5 is arranged so as to form a member for projecting the image of the edge 4a.
  • the rays r1 which pass as close as possible to the edge 4a, without encountering the surface of the bender, in particular at the level of a focal zone of the exit diopter 5, are refracted by the exit diopter 5 in a manner parallel to an optical axis O of the light module.
  • Some of these downwardly refracted rays r2 are first reflected directly by the reflector 3 on the exit diopter 5, passing above the edge 4a.
  • Other rays r3 refracted downwards are first reflected by the reflection member 3 behind the edge 4a, and are therefore reflected by the bender 4, by total internal reflection, towards the exit diopter 5 , also passing over stop 4a.
  • This beam is the light beam emitted by the optical module.
  • this beam has an upper cut-off line L, as illustrated in figure 6 .
  • This cut line L corresponds to the image of the edge 4a, which therefore forms the cut edge of the folder 4, the rays being sent to the highest point on the cut line (rays r1) or below (rays r2 , r3).
  • this beam is a central portion of a dipped beam. It can be observed that the edge 4a indeed has an oblique portion and two horizontal portions on either side of this oblique portion, corresponding to the shape of the cut line L. The latter is illustrated by the dotted lines in figure 6 , the isolux curve above it represents a very low intensity, not dazzling. Most of the rays are sent below this cut-off line L.
  • the second plurality of collimators here comprises five collimators 2" which are each optically coupled from upstream to downstream to a reflection member 3", a cut-off member 4" and a 5" output device, arranged so as to shape the light rays emitted by the light source so as to form a beam with horizontal cut-off, according to the same principle as described in picture 3 .
  • the difference is that here the cutting edge 4a" is in a horizontal plane.
  • the central portion and the horizontal cut-off beam are emitted at the same time so as to form a passing beam.
  • the diopters forming the input diopter 2 of the collimators 2', 2", the reflection members 3, 3", the benders 4, 4" forming the cut-off members and the output diopters 5, 5" therefore allow by their arrangement of shaping the beam to match a dipped beam. These diopters therefore form the active surfaces of the optical part 1.
  • inactive surfaces one can observe in figures 1 to 3 an upper front surface 6 and a left side surface 10. As can be seen, these inactive surfaces 6, 10 have undulations, and will be referred to hereinafter as upper 6 and side 10 undulating surfaces.
  • the figure 5 represents the beam obtained by an optical part, not shown, identical to that of the figures 1 to 3 , except that the inactive surfaces are devoid of undulations.
  • Za zone a luminous protuberance above the cut-off line.
  • the beam obtained is therefore not in accordance with what is expected.
  • This overcurrent is due to stray rays having reached the upper front and left side surfaces. Since these surfaces are not designed for this, these rays can, as here, be reflected back into the beam at undesirable places.
  • these rays can even dazzle the drivers of following or oncoming vehicles.
  • the invention proposes, as in this example, that at least one of the inactive surfaces has a diffusing portion so as to diffuse the rays which reach it.
  • the upper front surface 6 has such a diffusing portion, called upper diffusing portion 7.
  • the left side surface 10 has three diffusing portions, called lateral diffusing portions 11.
  • These diffusing portions 7, 11 are covered with a plurality of diffusing structures 8, 12 arranged so as to diffuse the rays reaching the corresponding diffusing portion.
  • these rays will either be emitted outside the projection field, namely outside the screen illustrated in figure 6 , or spread out, so that they will not form an annoying overcurrent in this beam.
  • These structures 8, 12 are here arranged in such a way that the diffusing portions 7, 11 are corrugated.
  • these undulations follow one another in a single given direction, here longitudinal.
  • these undulations form streaks 12 parallel to each other in a direction orthogonal to this longitudinal direction.
  • these ridges are parallel to a direction of demolding D/D' of the optical part 1.
  • these undulations follow one another along two given directions transverse to each other, here along the transverse direction Y and along the longitudinal direction X.
  • the undulations thus form structures forming beadings 12 (or “pillows” in English English) allowing demolding in the direction of demolding D/D' of the optical part 1.
  • the undulations of the diffusing portions 7, 11 make it possible to produce the optical part 1 by molding with two mold cavities, without adding a drawer or complex movements for producing the diffusing structures.
  • the figure 4 illustrates an example of regular periodic variation applicable to a diffusing surface p chaining only along two directions X', Y' of transverse variations between them, in particular intended to be orthogonal to the demolding direction, here vertical Z', of the part optical.
  • the surface varies in the vertical direction Z' both in the longitudinal direction L and in the transverse direction Y'.
  • the periodic variations are defined by at least one sinusoidal type function.
  • X', Y' and Z' will be oriented according to the orientation of the corrugated surface.
  • the sinusoidal variation is linked only along the longitudinal axis X, with a variation around this axis X in the plane X,Z. There is no variation according to a vertical or transverse direction of propagation.
  • Y corresponds to Z', X to X' and Z to Y' (in figure 4 the surface is horizontal, whereas it is vertical in the optical part 1, as can be seen in figure 2 ).
  • the sinusoidal variation is linked only along two axes: longitudinal X, with a variation around this axis X in the vertical plane X, Z, and transverse Y, with a variation around this axis Y in the vertical plane Y, Z.
  • Y corresponds approximately to Y', X approximately to X' and Z approximately to Z'.
  • the figures 7 to 9 illustrate an optical part 101 according to a second embodiment of the invention.
  • optical part 101 according to this second example is similar to the first. Only the essential differences will be explained below. For the other characteristics, reference may be made to the preceding description (note that between the second and the first example, the means fulfilling the same functions take up the same references increased by 100).
  • the optical part 101 comprises a single first plurality of collimators 102', which are each intended to receive the light rays emitted by a light source, as for the second plurality of collimators 2'' of the first example.
  • the optical part 101 also comprises, in addition to the diopters of the 2" collimators, diopters forming active surfaces, namely respectively: a reflection member 103, a bender 104, a projection member 105 or output diopter 105.
  • this beam is a beam with a horizontal cut-off line. It can be observed that the edge 104a, the image of which forms the cut line, is indeed included in a horizontal plane XY.
  • the optical part 101 is intended to be mounted in a headlamp (not shown) with a similar optical part (not shown) but the edge of which has the shape of the oblique cut in the center of a dipped beam, for example with a oblique portion and two horizontal portions on either side of this oblique portion.
  • An additional module with an identical optical part, or at least also performing a horizontal cut-off, may also be used in the device, so as to superimpose its beam on that coming from the illustrated optical part 101.
  • an inactive surface 106 has a diffusing portion 107 arranged so as to diffuse the rays which reach it. This is a front upper surface.
  • these rays will either be emitted outside the projection field, or spread out, so that they will not form an annoying over-intensity in this beam.
  • this inactive surface 106 has undulations, forming scattering beadings 108 .
  • the periodic variations are therefore defined by at least one function of sinusoidal type.
  • the construction therefore uses the previous equation, but with different coefficients of the sinusoidal components and also with the addition of conditions.
  • X', Y' and Z' are oriented according to the orientation of the corrugated surface. So compared to the example of figure 4 , Y corresponds to Z', X to X' and Z to Y'.

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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)
  • Optical Elements Other Than Lenses (AREA)

Description

La présente invention se rapporte au domaine des dispositifs lumineux, notamment de véhicule automobile, dans lesquels une pièce optique monobloc en matériau transparent ou translucide est utilisée pour guider la lumière et/ou mettre en forme le faisceau lumineux correspondant.The present invention relates to the field of light devices, in particular for motor vehicles, in which a one-piece optical part made of transparent or translucent material is used to guide the light and/or shape the corresponding light beam.

Pour cela une telle pièce optique comprend des surfaces actives, qui sont agencées spécifiquement de manière à guider et à dévier les rayons lumineux, notamment par réflexion interne totale ou par réfraction. Un exemple d'une telle pièce optique est décrit dans le document FR3039883A1 .For this, such an optical part comprises active surfaces, which are arranged specifically so as to guide and deflect the light rays, in particular by total internal reflection or by refraction. An example of such an optical part is described in the document FR3039883A1 .

D'autres pièces optiques sont connues de EP2818792 A2 et US2014/0146555 A1 .Other optical parts are known from EP2818792 A2 and US2014/0146555 A1 .

Néanmoins, on peut observer qu'avec certaines de ces pièces optiques certains rayons, dits rayons parasites, sont envoyés dans le faisceau selon des directions indésirables. Cela peut résulter en des surintensités ou des inhomogénéités lumineuses dans le faisceau émis par le dispositif lumineux. Cela peut être préjudiciable pour le confort et pour la sécurité, en particulier dans le cas de faisceaux de croisement.Nevertheless, it can be observed that with some of these optical parts certain rays, called parasitic rays, are sent into the beam in undesirable directions. This can result in overintensities or light inhomogeneities in the beam emitted by the light device. This can be detrimental for comfort and for safety, in particular in the case of dipped beams.

Un faisceau de croisement émet un faisceau d'éclairage de la route présentant une coupure au-dessus de laquelle quasiment aucun rayon n'est envoyé, permettant d'éviter l'éblouissement des véhicules suivis ou venant en sens opposé. Il est donc d'autant plus important dans ce cas d'éviter des rayons parasites qui parviendraient au-dessus de la coupure et risqueraient d'éblouir les conducteurs de ces véhicules.A dipped beam emits a beam of illumination of the road having a cut-off above which practically no beam is sent, making it possible to avoid the dazzling of vehicles being followed or coming in the opposite direction. It is therefore all the more important in this case to avoid parasitic rays which would reach above the cut-off and risk dazzling the drivers of these vehicles.

Un problème technique que vise à résoudre la présente invention est donc d'éviter la formation de rayons parasites dans le faisceau lumineux produit par un dispositif lumineux au moyen d'une pièce optique en matériau transparent.A technical problem which the present invention aims to solve is therefore to avoid the formation of stray rays in the light beam produced by a light device by means of an optical part made of transparent material.

A cet effet, un premier objet de l'invention est une pièce optique monobloc selon la revendication 1.To this end, a first object of the invention is a one-piece optical part according to claim 1.

En effet, la demanderesse s'est aperçu que certains des rayons parasites se formant dans les faisceaux lumineux produits à l'aide de pièces optiques monobloc transparentes ou translucides étaient en fait réfléchis par des surfaces optiquement inactives de ces pièces optiques avant d'en sortir. Cela est dû au fait que certains des rayons lumineux émis initialement par la source lumineuse du module optique contenant une telle pièce optique, n'atteignent pas comme souhaité les surfaces optiquement actives, c'est-à-dire les surfaces actives agencées pour mettre en forme le faisceau, mais atteignent des surfaces optiquement inactives. Ces surfaces optiquement inactives sont dites inactives car elles ne devraient pas recevoir ces rayons, ou du moins ne recevoir qu'une faible quantité de ces rayons, et ne sont pas conçues pour dévier ces rayons de manière à former le faisceau.Indeed, the applicant has noticed that some of the parasitic rays forming in the light beams produced using transparent or translucent one-piece optical parts were in fact reflected by optically inactive surfaces of these optical parts before leaving them. . This is due to the fact that some of the light rays initially emitted by the light source of the optical module containing such an optical part, do not reach the optically active surfaces as desired, that is to say the active surfaces arranged to highlight forms the beam, but reaches optically inactive surfaces. These optically inactive surfaces are said to be inactive because they should not receive these rays, or at least only receive a small quantity of these rays, and are not designed to deflect these rays so as to form the beam.

Grâce à l'invention, on supprime ces rayons parasites et/ou on diminue l'effet de ces rayons parasites, par exemple en les étalant vers l'avant. On diminue ainsi des concentrations lumineuses indésirables dans le faisceau.Thanks to the invention, these parasitic rays are eliminated and/or the effect of these parasitic rays is reduced, for example by spreading them forward. Undesirable light concentrations in the beam are thus reduced.

La pièce optique selon l'invention peut optionnellement comprendre une ou plusieurs des caractéristiques suivantes :

  • la portion diffusante est couverte d'une pluralité de structures agencées de manière à diffuser les rayons atteignant la portion diffusante correspondante ; les moyens de diffusion peuvent ainsi être réalisés directement lors de la fabrication de la pièce optique ;
  • la portion diffusante est ondulée ; cela permet de calculer plus facilement cette portion de surface ;
  • la portion diffusante présente des stries parallèles entre elles ;
  • la pièce optique est obtenue par moulage, les stries étant parallèles à la direction de démoulage ; cela permet de réaliser ces stries par moulage avec une étape de démoulage simple ;
  • la pluralité de structures est formée par une variation périodique de la surface inactive correspondante ; cela permet de calculer plus facilement cette portion de surface ;
  • la variation périodique de la portion diffusante de la surface inactive ou d'au moins l'une des surfaces inactives est agencée uniquement selon deux directions de variation transversales entre elles ; c'est un exemple de réalisation de bossages ;
  • la pièce optique est obtenue par moulage, les deux directions de variation étant orthogonales à la direction de démoulage; cela permet de réaliser ces variations par moulage avec une étape de démoulage simple ;
  • les variations périodiques sont définies par au moins une fonction de type sinusoïdale ; on obtient des résultats particulièrement efficaces avec ce type de fonction ;
  • selon l'invention, l'une des surfaces actives est une plieuse agencée de manière à recevoir les rayons lumineux provenant du dioptre d'entrée et à les renvoyer en aval, notamment vers le dioptre de sortie ; cela permet de réaliser un faisceau à coupure avec peu de rayons parasites au-dessus de la coupure.
The optical part according to the invention may optionally comprise one or more of the following characteristics:
  • the diffusing portion is covered with a plurality of structures arranged to diffuse the rays reaching the corresponding diffusing portion; the diffusion means can thus be produced directly during the manufacture of the optical part;
  • the diffusing portion is corrugated; this makes it easier to calculate this portion of surface;
  • the diffusing portion has mutually parallel streaks;
  • the optical part is obtained by molding, the ridges being parallel to the direction of demolding; this makes it possible to produce these ridges by molding with a simple demolding step;
  • the plurality of structures is formed by a periodic variation of the corresponding inactive surface; this makes it easier to calculate this portion of surface;
  • the periodic variation of the diffusing portion of the inactive surface or of at least one of the inactive surfaces is arranged only along two directions of variation transverse to each other; this is an example of making bosses;
  • the optical part is obtained by molding, the two directions of variation being orthogonal to the direction of demolding; this makes it possible to produce these variations by molding with a simple demolding step;
  • the periodic variations are defined by at least one function of sinusoidal type; particularly effective results are obtained with this type of function;
  • according to the invention, one of the active surfaces is a bender arranged so as to receive the light rays coming from the input interface and to send them back downstream, in particular towards the interface Release ; this makes it possible to produce a cut-off beam with few parasitic rays above the cut-off.

Un autre objet de l'invention est un dispositif lumineux de véhicule, notamment un projecteur, comprenant une pièce optique selon l'invention et au moins une source lumineuse émettant ses rayons essentiellement vers ledit dioptre d'entrée.Another object of the invention is a vehicle lighting device, in particular a headlamp, comprising an optical part according to the invention and at least one light source emitting its rays essentially towards said input diopter.

La source de lumière peut être une diode électroluminescente, encore appelée DEL ou plus couramment LED (pour Light Emitting Diode en langue anglaise)The light source can be a light-emitting diode, also called LED or more commonly LED (for Light Emitting Diode in English)

L'invention a également pour objet un véhicule comprenant un dispositif d'éclairage et/ou de signalisation de véhicule selon l'invention, notamment connecté à l'alimentation électrique du véhicule.The invention also relates to a vehicle comprising a vehicle lighting and/or signaling device according to the invention, in particular connected to the vehicle's power supply.

Sauf indication contraire, les termes « avant », « arrière », « haut », « bas », « transversal », « longitudinal », « horizontal », ainsi que leurs déclinaisons en genre ou en nombre, se réfèrent au sens d'émission de lumière hors du module lumineux correspondant. Sauf indication contraire, les termes « amont » et « aval » se réfèrent au sens de propagation de la lumière.Unless otherwise indicated, the terms "front", "rear", "top", "bottom", "transverse", "longitudinal", "horizontal", as well as their variations in gender or number, refer to the meaning of light emission out of the corresponding light module. Unless otherwise specified, the terms "upstream" and "downstream" refer to the direction of light propagation.

D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description détaillée des exemples non limitatifs qui suivent, pour la compréhension de laquelle on se reportera aux dessins annexés, parmi lesquels :

  • la figure 1 est une vue en perspective avant et de dessus d'une pièce optique selon un premier exemple de l'invention ;
  • la figure 2 est une vue en perspective arrière et de dessous de la pièce optique de la figure 1 ;
  • la figure 3 est une coupe longitudinale de la pièce optique de la figure 1, sur laquelle est également représentée une source lumineuse ;
  • la figure 4 est une vue en perspective d'un exemple de variations de surface, telles que celles agencées sur la pièce optique de la figure 1 ;
  • les figures 5 et 6 illustrent les courbes isolux de faisceaux lumineux en projection sur un écran vertical, notamment à 25 mètres, ces faisceaux étant obtenus avec respectivement une pièce optique telle que celle de la figure 1 mais sans la variation périodique de surface et la pièce optique de la figure 1;
  • la figure 7 est une vue en perspective avant et de dessus d'une pièce optique selon un deuxième exemple de l'invention ;
  • la figure 8 est une vue en perspective arrière et de dessous de la pièce optique de la figure 7 ;
  • la figure 9 est une coupe transversale de la pièce optique des figures 7 et 8, selon le plan P représenté en figure 8.
Other characteristics and advantages of the invention will appear on reading the detailed description of the non-limiting examples which follow, for the understanding of which reference will be made to the appended drawings, among which:
  • the figure 1 is a front and top perspective view of an optical part according to a first example of the invention;
  • the figure 2 is a rear and bottom perspective view of the optical part of the figure 1 ;
  • the picture 3 is a longitudinal section of the optical part of the figure 1 , on which a light source is also represented;
  • the figure 4 is a perspective view of an example of surface variations, such as those arranged on the optical part of the figure 1 ;
  • them figures 5 and 6 illustrate the isolux curves of light beams projected onto a vertical screen, in particular at 25 meters, these beams being obtained respectively with an optical part such as that of the figure 1 but without the periodic surface variation and optical part of the figure 1 ;
  • the figure 7 is a front and top perspective view of an optical part according to a second example of the invention;
  • the figure 8 is a rear and bottom perspective view of the optical part of the figure 7 ;
  • the figure 9 is a cross section of the optical part of the figures 7 and 8 , according to the plane P represented in figure 8 .

Les figures 1 à 3 illustrent une pièce optique 1 selon un premier exemple de réalisation de l'invention. Il s'agit ici d'une pièce optique 1 monobloc, en matériau transparent ou translucide, notamment du polycarbonate (PC).The figures 1 to 3 illustrate an optical part 1 according to a first embodiment of the invention. This is a one-piece optical part 1, made of transparent or translucent material, in particular polycarbonate (PC).

Dans cet exemple, il s'agit d'une pièce optique d'un module lumineux de projecteur de véhicule.In this example, it is an optical part of a vehicle headlight light module.

La pièce optique 1 comprend une première pluralité de collimateurs 2' et une deuxième pluralité de collimateurs 2". Chacun de ces collimateurs 2', 2" comprend un dioptre d'entrée 2, destiné à recevoir les rayons lumineux r1, r2, r3 émis par une source lumineuse 21, destinée à être placée ici en vis-à-vis et proche de l'extrémité libre du collimateur correspondant 2', 2", en haut en éclairant vers le bas dans cet exemple.The optical part 1 comprises a first plurality of collimators 2' and a second plurality of collimators 2". Each of these collimators 2', 2" comprises an input dioptre 2, intended to receive the light rays r1, r2, r3 emitted by a light source 21, intended to be placed here opposite and close to the free end of the corresponding collimator 2′, 2″, at the top while illuminating downwards in this example.

Dans cet exemple, la source lumineuse est une diode électroluminescente, encore appelée LED 21.In this example, the light source is a light-emitting diode, also called LED 21.

Ces rayons lumineux r1, r2, r3 entrent par réfraction dans les collimateurs 2', 2", donc dans la pièce optique 1.These light rays r1, r2, r3 enter by refraction into the collimators 2', 2", therefore into the optical part 1.

La première pluralité de collimateurs comprend ici deux collimateurs 2', qui sont chacun couplés optiquement à un organe de réflexion 3, qui est lui couplé optiquement à un organe de coupure 4, lui-même couplé à un organe de sortie 5. Ces différents éléments sont donc couplés entre eux et agencés de manière à mettre en forme les rayons lumineux émis par les sources lumineuses 21 de manière à former un faisceau à coupure.The first plurality of collimators here comprises two collimators 2', which are each optically coupled to a reflection member 3, which is itself optically coupled to a switching member 4, itself coupled to an output member 5. These different elements are therefore coupled together and arranged so as to shape the light rays emitted by the light sources 21 so as to form a cut-off beam.

Chaque collimateur 2' est agencé pour envoyer, ici par réfraction et réflexion totale interne, les rayons lumineux r1, r2, r3 émis par la LED 21, en un faisceau davantage concentré, en direction de l'organe de réflexion 3.Each collimator 2' is arranged to send, here by refraction and total internal reflection, the light rays r1, r2, r3 emitted by the LED 21, in a more concentrated beam, in the direction of the reflection member 3.

Cet organe de réflexion 3 est ici un dioptre agencé de manière à réfléchir par réflexion totale interne ces rayons r1, r2, r3 vers l'organe de coupure 4, plus particulièrement vers l'arrête 4a de cet organe de coupure 4. Par exemple, l'organe de réflexion 4 peut réfléchir ces rayons r1, r2, r3 vers une zone focale agencée au niveau de cette arrête 4a.This reflection member 3 is here an optical interface arranged so as to reflect by total internal reflection these rays r1, r2, r3 towards the switching device 4, more particularly towards the edge 4a of this switching device 4. For example, the reflection member 4 can reflect these rays r1, r2, r3 towards a focal zone arranged at this edge 4a.

Ces rayons r1, r2, r3 passent au niveau de cette arrête 4a de trois manières différentes, comme il sera expliqué ci-après, puis atteignent l'organe de sortie 5, ici le dioptre de sortie 5 de la pièce optique 1. Ils sortent ensuite de la pièce optique 1 par réfraction au travers du dioptre de sortie 5.These rays r1, r2, r3 pass at the level of this edge 4a in three different ways, as will be explained below, then reach the output member 5, here the output dioptre 5 of the optical part 1. They come out then of the optical part 1 by refraction through the exit diopter 5.

Ce dioptre de sortie 5 est agencé de manière à former un organe de projection de l'image de l'arrête 4a.This exit diopter 5 is arranged so as to form a member for projecting the image of the edge 4a.

Ainsi, les rayons r1 qui passent au plus près de l'arrête 4a, sans rencontrer la surface de la plieuse, notamment au niveau d'une zone focale du dioptre de sortie 5, sont réfractés par le dioptre de sortie 5 de manière parallèle à un axe optique O du module lumineux.Thus, the rays r1 which pass as close as possible to the edge 4a, without encountering the surface of the bender, in particular at the level of a focal zone of the exit diopter 5, are refracted by the exit diopter 5 in a manner parallel to an optical axis O of the light module.

En revanche, les rayons r2 et r3 qui passent au-dessus de cette arrête 4a sont réfractés vers le bas par le dioptre de sortie 5.On the other hand, the rays r2 and r3 which pass above this edge 4a are refracted downwards by the exit diopter 5.

Certains de ces rayons r2 réfractés vers le bas, sont d'abord réfléchis directement par l'organe de réflexion 3 sur le dioptre de sortie 5, en passant au-dessus de l'arrête 4a. D'autres rayons r3 réfractés vers le bas, sont d'abord réfléchis par l'organe de réflexion 3 en arrière de l'arrête 4a, et sont donc réfléchis par la plieuse 4, par réflexion totale interne, vers le dioptre de sortie 5, en passant également au-dessus de l'arrête 4a.Some of these downwardly refracted rays r2 are first reflected directly by the reflector 3 on the exit diopter 5, passing above the edge 4a. Other rays r3 refracted downwards are first reflected by the reflection member 3 behind the edge 4a, and are therefore reflected by the bender 4, by total internal reflection, towards the exit diopter 5 , also passing over stop 4a.

L'essentiel, voire la totalité, des rayons r1, r2, r3 participe donc à la formation du faisceau sortant de la pièce optique 1. Ce faisceau est le faisceau lumineux émis par le module optique.Most, or even all, of the rays r1, r2, r3 therefore contribute to the formation of the beam emerging from the optical part 1. This beam is the light beam emitted by the optical module.

Par ailleurs, ce faisceau présente une ligne de coupure L supérieure, comme illustré en figure 6. Cette ligne de coupure L correspond à l'image de l'arrête 4a, qui forme donc le bord de coupure de la plieuse 4, les rayons étant envoyés au plus haut sur la ligne de coupure (rayons r1) ou en dessous (rayons r2, r3).Furthermore, this beam has an upper cut-off line L, as illustrated in figure 6 . This cut line L corresponds to the image of the edge 4a, which therefore forms the cut edge of the folder 4, the rays being sent to the highest point on the cut line (rays r1) or below (rays r2 , r3).

Ici ce faisceau est une portion centrale d'un faisceau de croisement. On peut observer que l'arrête 4a présente en effet une portion oblique et deux portions horizontales de part et d'autre de cette portion oblique, correspondant à la forme de la ligne de coupure L. Cette dernière est illustrée par les pointillés en figure 6, la courbe isolux au-dessus de celle-ci représente une intensité très faible, non éblouissante. L'essentiel des rayons est envoyé en-dessous de cette ligne de coupure L.Here this beam is a central portion of a dipped beam. It can be observed that the edge 4a indeed has an oblique portion and two horizontal portions on either side of this oblique portion, corresponding to the shape of the cut line L. The latter is illustrated by the dotted lines in figure 6 , the isolux curve above it represents a very low intensity, not dazzling. Most of the rays are sent below this cut-off line L.

La deuxième pluralité de collimateurs comprend ici cinq collimateurs 2" qui sont chacun couplés optiquement d'amont en aval à un organe de réflexion 3", un organe de coupure 4" et un organe de sortie 5", agencés de manière à mettre en forme les rayons lumineux émis par la source lumineuse de manière à former un faisceau à coupure horizontale, selon le même principe que décrit en figure 3. La différence est qu'ici l'arrête de coupure 4a" est dans un plan horizontal.The second plurality of collimators here comprises five collimators 2" which are each optically coupled from upstream to downstream to a reflection member 3", a cut-off member 4" and a 5" output device, arranged so as to shape the light rays emitted by the light source so as to form a beam with horizontal cut-off, according to the same principle as described in picture 3 . The difference is that here the cutting edge 4a" is in a horizontal plane.

La portion centrale et le faisceau à coupure horizontale sont émis en même temps de manière à former un faisceau de croisement.The central portion and the horizontal cut-off beam are emitted at the same time so as to form a passing beam.

Les dioptres formant le dioptre d'entrée 2 des collimateurs 2', 2", les organes de réflexion 3, 3", les plieuses 4, 4" formant les organes de coupure et les dioptres de sortie 5, 5" permettent donc par leur agencement de mettre en forme le faisceau de manière à ce qu'il corresponde à un faisceau de croisement. Ces dioptres forment donc les surfaces actives de la pièce optique 1.The diopters forming the input diopter 2 of the collimators 2', 2", the reflection members 3, 3", the benders 4, 4" forming the cut-off members and the output diopters 5, 5" therefore allow by their arrangement of shaping the beam to match a dipped beam. These diopters therefore form the active surfaces of the optical part 1.

On peut donc voir de plus que toutes les surfaces ne sont pas conçues de manière à recevoir des rayons lumineux, émis à l'origine par des LED 21. Elles ne participent pas à la formation du faisceau lumineux. Ces surfaces sont ainsi appelées surfaces inactives.It can therefore be seen moreover that not all the surfaces are designed in such a way as to receive light rays, originally emitted by LEDs 21. They do not participate in the formation of the light beam. These surfaces are thus called inactive surfaces.

Il s'agit essentiellement de surfaces joignant les surfaces actives.These are essentially surfaces joining the active surfaces.

Parmi ces surfaces inactives, on peut observer en figures 1 à 3 une surface supérieure avant 6 et une surface latérale gauche 10. Comme on peut le voir, ces surfaces inactives 6, 10 présentent des ondulations, et seront appelées ci-après surfaces ondulées supérieure 6 et latérale 10.Among these inactive surfaces, one can observe in figures 1 to 3 an upper front surface 6 and a left side surface 10. As can be seen, these inactive surfaces 6, 10 have undulations, and will be referred to hereinafter as upper 6 and side 10 undulating surfaces.

Ces ondulations permettent d'éliminer un maximum, voire la totalité de rayons parasites dans le faisceau.These undulations make it possible to eliminate a maximum, or even all, of the parasitic rays in the beam.

La figure 5 représente le faisceau obtenu par une pièce optique, non représentée, identique à celle des figures 1 à 3, excepté que les surfaces inactives sont dépourvues d'ondulations.The figure 5 represents the beam obtained by an optical part, not shown, identical to that of the figures 1 to 3 , except that the inactive surfaces are devoid of undulations.

On peut observer dans la zone Za, une protubérance lumineuse au-dessus de la ligne de coupure. Le faisceau obtenu est donc non conforme à ce qui est attendu. Cette surintensité est due à des rayons parasites ayant atteint les surfaces supérieure avant et latérale gauche. Ces surfaces n'étant pas conçues pour cela ces rayons peuvent, comme ici, être renvoyés dans le faisceau à des endroits non souhaitables.One can observe in the Za zone, a luminous protuberance above the cut-off line. The beam obtained is therefore not in accordance with what is expected. This overcurrent is due to stray rays having reached the upper front and left side surfaces. Since these surfaces are not designed for this, these rays can, as here, be reflected back into the beam at undesirable places.

Dans certains cas, ces rayons peuvent même éblouir les conducteurs des véhicules suivis ou venant en sens inverse.In some cases, these rays can even dazzle the drivers of following or oncoming vehicles.

Pour remédier à cela, l'invention propose, comme dans cet exemple, qu'au moins une des surfaces inactives présente une portion diffusante de manière à diffuser des rayons qui l'atteignent.To remedy this, the invention proposes, as in this example, that at least one of the inactive surfaces has a diffusing portion so as to diffuse the rays which reach it.

Dans cet exemple, illustré en figures 1 à 3, la surface supérieure avant 6 présente une telle portion diffusante, dite portion diffusante supérieure 7. De même, la surface latérale gauche 10 présente trois portions diffusantes, dites portions diffusantes latérales 11.In this example, shown in figures 1 to 3 , the upper front surface 6 has such a diffusing portion, called upper diffusing portion 7. Similarly, the left side surface 10 has three diffusing portions, called lateral diffusing portions 11.

Ces portions diffusantes 7, 11 sont couvertes d'une pluralité de structures 8, 12 diffusantes agencées de manière à diffuser les rayons atteignant la portion diffusante correspondante. Ainsi ces rayons seront soit émis hors du champ de projection, à savoir hors de l'écran illustré en figure 6, soit étalés, de sorte qu'ils ne formeront pas une surintensité gênante dans ce faisceau.These diffusing portions 7, 11 are covered with a plurality of diffusing structures 8, 12 arranged so as to diffuse the rays reaching the corresponding diffusing portion. Thus these rays will either be emitted outside the projection field, namely outside the screen illustrated in figure 6 , or spread out, so that they will not form an annoying overcurrent in this beam.

Ces structures 8, 12 sont ici agencées de telle manière que les portions diffusantes 7, 11 sont ondulées.These structures 8, 12 are here arranged in such a way that the diffusing portions 7, 11 are corrugated.

Sur les portions diffusantes latérales 11, ces ondulations s'enchainent selon une unique direction donnée, ici longitudinale. Ainsi, ces ondulations forment des stries 12 parallèles entre elles selon une direction orthogonale à cette direction longitudinale. Comme ici, ces stries sont parallèles à une direction de démoulage D/D' de la pièce optique 1.On the lateral diffusing portions 11, these undulations follow one another in a single given direction, here longitudinal. Thus, these undulations form streaks 12 parallel to each other in a direction orthogonal to this longitudinal direction. As here, these ridges are parallel to a direction of demolding D/D' of the optical part 1.

Sur les portions diffusantes supérieures 7, ces ondulations s'enchainent selon deux directions données transversales entre elles, ici selon la direction transversale Y et selon la direction longitudinale X. Les ondulations forment ainsi des structures formant des billages 12 (ou « pillows » en langue anglaise) permettant un démoulage selon la direction de démoulage D/D' de la pièce optique 1.On the upper diffusing portions 7, these undulations follow one another along two given directions transverse to each other, here along the transverse direction Y and along the longitudinal direction X. The undulations thus form structures forming beadings 12 (or “pillows” in English English) allowing demolding in the direction of demolding D/D' of the optical part 1.

Ainsi les ondulations des portions diffusantes 7, 11 permettent de réaliser la pièce optique 1 par moulage avec deux empreintes de moule, sans ajouter de tiroir ou de mouvements complexes pour la réalisation des structures diffusantes.Thus the undulations of the diffusing portions 7, 11 make it possible to produce the optical part 1 by molding with two mold cavities, without adding a drawer or complex movements for producing the diffusing structures.

Selon cet exemple de réalisation, des résultats particulièrement intéressant ont été obtenus en réalisant les pluralités de structures diffusantes 8, 12 et les ondulations correspondantes par une variation périodique de la surface active 6, 10 correspondante.According to this embodiment, particularly interesting results have been obtained by producing the plurality of diffusing structures 8, 12 and the corresponding undulations by a periodic variation of the corresponding active surface 6, 10.

La figure 4 illustre un exemple de variation périodique régulière applicable à une surface diffusante p s'enchainant uniquement selon deux directions X', Y' de variations transversales entre elles, notamment destinées à être orthogonales à la direction de démoulage, ici verticale Z', de la pièce optique. Autrement dit en figure 4, la surface varie selon la direction verticale Z' à la fois selon la direction longitudinale L et selon la direction transversale Y'.The figure 4 illustrates an example of regular periodic variation applicable to a diffusing surface p chaining only along two directions X', Y' of transverse variations between them, in particular intended to be orthogonal to the demolding direction, here vertical Z', of the part optical. In other words in figure 4 , the surface varies in the vertical direction Z' both in the longitudinal direction L and in the transverse direction Y'.

Ici ces variations forment également des billages b.Here these variations also form billings b.

Dans cet exemple, les variations périodiques sont définies par au moins une fonction de type sinusoïdale.In this example, the periodic variations are defined by at least one sinusoidal type function.

On peut néanmoins faire varier les coefficients des composantes sinusoïdales dans les directions selon lesquelles s'enchaînent les ondulations, appelées ci-après directions de propagation X' et Y'.It is nevertheless possible to vary the coefficients of the sinusoidal components in the directions in which the undulations are linked together, hereinafter called directions of propagation X′ and Y′.

D'une manière générale selon l'invention, comme dans cet exemple, cette surface peut être définie par l'équation suivante : Z ′ = X ′ _Epaisseur * sin X ′ _Période * π * x + Y ′ _Epaisseur * sin Y ′ _ Période * π * y

Figure imgb0001
avec :

  • X'_ Epaisseur: épaisseur selon X' de la variation, soit la hauteur de crête à crête maximale,
  • X'_Période : période de la variation en X',
  • Y'_ Epaisseur: épaisseur selon Y' de la variation, soit la hauteur de crête à crête maximale,
  • Y'_Période : période de la variation en Y',
  • x: valeur longitudinale selon l'axe X', longitudinal,
  • y: valeur longitudinale selon l'axe Y' transversal,
Generally according to the invention, as in this example, this surface can be defined by the following equation: Z ′ = X ′ _Thickness * sin X ′ _Period * π * x + Y ′ _Thickness * sin Y ′ _ Period * π * there
Figure imgb0001
 with :
  • X'_ Thickness: thickness according to X' of the variation, i.e. the maximum peak-to-peak height,
  • X'_Period: period of the variation in X',
  • Y'_ Thickness: thickness according to Y' of the variation, i.e. the maximum peak-to-peak height,
  • Y'_Period: period of the variation in Y',
  • x: longitudinal value along the X' axis, longitudinal,
  • y: longitudinal value along the transverse Y' axis,

X', Y' et Z' seront orientés selon l'orientation de la surface ondulés.X', Y' and Z' will be oriented according to the orientation of the corrugated surface.

Par exemple, concernant les portions diffusantes latérales 11, la variation sinusoïdale est s'enchaîne seulement selon l'axe longitudinal X, avec une variation autour de cet axe X dans le plan X,Z. Il n'y a pas de variation selon une direction de propagation verticale ou transversale.For example, concerning the lateral diffusing portions 11, the sinusoidal variation is linked only along the longitudinal axis X, with a variation around this axis X in the plane X,Z. There is no variation according to a vertical or transverse direction of propagation.

Les valeurs des coefficients peuvent donc être :

  • X'_ Epaisseur =0.3mm
  • X'_Periode=21
  • Y'_ Epaisseur =0mm
  • Y'_Periode=0
The values of the coefficients can therefore be:
  • X'_ Thickness =0.3mm
  • X'_Period=21
  • Y'_ Thickness =0mm
  • Y'_Period=0

A noter que par rapport à l'exemple de la figure 4, Y correspond à Z', X à X' et Z à Y' (en figure 4 la surface est horizontale, alors qu'elle est verticale dans la pièce optique 1, tel qu'on peut le voir en figure 2).Note that compared to the example of the figure 4 , Y corresponds to Z', X to X' and Z to Y' (in figure 4 the surface is horizontal, whereas it is vertical in the optical part 1, as can be seen in figure 2 ).

Concernant la portion diffusante supérieure 7, la variation sinusoïdale s'enchaîne seulement selon deux axes : longitudinal X, avec une variation autour de cet axe X dans le plan vertical X, Z, et transversal Y, avec une variation autour de cet axe Y dans le plan vertical Y, Z.Concerning the upper diffusing portion 7, the sinusoidal variation is linked only along two axes: longitudinal X, with a variation around this axis X in the vertical plane X, Z, and transverse Y, with a variation around this axis Y in the vertical plane Y, Z.

Cette orientation étant la même qu'en figure 4, Y correspond environ à Y', X environ à X' et Z environ à Z'.This orientation being the same as in figure 4 , Y corresponds approximately to Y', X approximately to X' and Z approximately to Z'.

Les valeurs des coefficients peuvent donc être :

  • X'_ Epaisseur =0.3mm
  • X'_Période=21
  • Y'_ Epaisseur =0.3mm
  • Y'_Période=21
The values of the coefficients can therefore be:
  • X'_ Thickness =0.3mm
  • X'_Period=21
  • Y'_ Thickness =0.3mm
  • Y'_Period=21

Les figures 7 à 9 illustrent une pièce optique 101 selon un deuxième exemple de réalisation de l'invention.The figures 7 to 9 illustrate an optical part 101 according to a second embodiment of the invention.

La pièce optique 101 selon ce deuxième exemple est similaire au premier. Seules les différences essentielles seront exposées ci-après. Pour les autres caractéristiques, on pourra se reporter à la description précédente (à noter qu'entre le deuxième et le premier exemple, les moyens remplissant les mêmes fonctions reprennent les mêmes références augmentées de 100).The optical part 101 according to this second example is similar to the first. Only the essential differences will be explained below. For the other characteristics, reference may be made to the preceding description (note that between the second and the first example, the means fulfilling the same functions take up the same references increased by 100).

La pièce optique 101 comprend une unique première pluralité de collimateurs 102', qui sont destinés chacun à recevoir les rayons lumineux émis par une source lumineuse, comme pour la deuxième pluralité de collimateur 2'' du premier exemple.The optical part 101 comprises a single first plurality of collimators 102', which are each intended to receive the light rays emitted by a light source, as for the second plurality of collimators 2'' of the first example.

La pièce optique 101 comprend également, en plus des dioptres des collimateurs 2", des dioptres formant des surfaces actives, à savoir respectivement : un organe de réflexion 103, une plieuse 104, un organe de projection 105 ou dioptre de sortie 105.The optical part 101 also comprises, in addition to the diopters of the 2" collimators, diopters forming active surfaces, namely respectively: a reflection member 103, a bender 104, a projection member 105 or output diopter 105.

Ces surfaces actives 103, 104, 105 sont couplées de la même manière que dans le premier exemple de manière à former un faisceau à coupure. On pourra ainsi se reporter à la figure 3 et à la description correspondante pour illustrer les trajets de rayons et la formation d'une ligne de coupure dans le faisceau avec la plieuse 104.These active surfaces 103, 104, 105 are coupled in the same way as in the first example so as to form a cut-off beam. We can thus refer to the picture 3 and the corresponding description to illustrate the ray paths and the formation of a cut line in the beam with the bender 104.

Ici, ce faisceau est un faisceau avec une ligne de coupure horizontale. On peut observer que l'arrête 104a, dont l'image forme la ligne de coupure, est en effet comprise dans un plan horizontal XY.Here, this beam is a beam with a horizontal cut-off line. It can be observed that the edge 104a, the image of which forms the cut line, is indeed included in a horizontal plane XY.

La pièce optique 101 est destinée à être montée dans un projecteur (non représenté) avec une pièce optique similaire (non représentée) mais dont l'arrête a la forme de la coupure oblique au centre d'un faisceau de croisement, par exemple avec une portion oblique et deux portions horizontales de part et d'autre de cette portion oblique.The optical part 101 is intended to be mounted in a headlamp (not shown) with a similar optical part (not shown) but the edge of which has the shape of the oblique cut in the center of a dipped beam, for example with a oblique portion and two horizontal portions on either side of this oblique portion.

Un module supplémentaire avec une pièce optique identique, ou du moins réalisant également une coupure horizontale, pourra également être utilisée dans le dispositif, de manière à superposer son faisceau à celui provenant de la pièce optique 101 illustré.An additional module with an identical optical part, or at least also performing a horizontal cut-off, may also be used in the device, so as to superimpose its beam on that coming from the illustrated optical part 101.

Dans ce deuxième exemple, uniquement une surface inactive 106 présente une portion diffusante 107 agencée de manière à diffuser des rayons qui l'atteignent. Il s'agit ici d'une surface supérieure avant.In this second example, only an inactive surface 106 has a diffusing portion 107 arranged so as to diffuse the rays which reach it. This is a front upper surface.

Selon le même principe que dans le premier exemple, ces rayons seront soit émis hors du champ de projection, soit étalés, de sorte qu'ils ne formeront pas une surintensité gênante dans ce faisceau.According to the same principle as in the first example, these rays will either be emitted outside the projection field, or spread out, so that they will not form an annoying over-intensity in this beam.

Comme on peut le voir en figures 7 et 9, cette surface inactive 106 présente des ondulations, formant des billages 108 diffusants.As can be seen in figure 7 and 9 , this inactive surface 106 has undulations, forming scattering beadings 108 .

Ces ondulations sont ici des variations périodiques.These undulations are here periodic variations.

Ici, c'est également l'exemple de variation de surface de la figure 4 qui a été appliqué à la surface diffusante 106. Les variations périodiques sont donc définies par au moins une fonction de type sinusoïdale.Here is also the example of surface variation of the figure 4 which has been applied to the diffusing surface 106. The periodic variations are therefore defined by at least one function of sinusoidal type.

Ici, la construction reprend donc l'équation précédente, mais avec des coefficients des composantes sinusoïdales différents et également avec l'ajout de conditions.Here, the construction therefore uses the previous equation, but with different coefficients of the sinusoidal components and also with the addition of conditions.

La définition de la surface inactive 106 peut donc être définie ainsi :

  1. 1. Si :
    • X'_Epaisseur*sin(X'_Période*π*x)
    • +Y'_Epaisseur *sin(Y'_Période*π*y)< 0
    • Alors : Z'=0
  2. 2. Si : X'_ Epaisseur*sin(X'_Période*π*x)
    • +Y'_Epaisseur *sin(Y'_Période*π*y)≥ 0
    • Alors :
      Z'= X'_Epaisseur*sin(X'_Période*π*x)+Y'_Epaisseur*sin(Y'_Période*π *y)
The definition of the inactive surface 106 can therefore be defined as follows:
  1. 1. If:
    • X'_Thickness*sin(X'_Period*π*x)
    • +Y'_Thickness *sin(Y'_Period*π*y)< 0
    • Then: Z'=0
  2. 2. If: X'_ Thickness*sin(X'_Period*π*x)
    • +Y'_Thickness *sin(Y'_Period*π*y)≥ 0
    • So :
      Z'= X'_Thickness*sin(X'_Period*π*x)+Y'_Thickness*sin(Y'_Period*π *y)

Les valeurs des coefficients peuvent donc être :

  • X'_Epaisseur =0.3mm
  • X'_Période=35
  • Y'_Epaisseur =0.3mm
  • Y'_Période=35
The values of the coefficients can therefore be:
  • X'_Thickness =0.3mm
  • X'_Period=35
  • Y'_Thickness =0.3mm
  • Y'_Period=35

X', Y' et Z' sont orientés selon l'orientation de la surface ondulée. Ainsi par rapport à l'exemple de la figure 4, Y correspond à Z', X à X' et Z à Y'.X', Y' and Z' are oriented according to the orientation of the corrugated surface. So compared to the example of figure 4 , Y corresponds to Z', X to X' and Z to Y'.

Comme on peut l'observer en figure 9, du fait de ces conditions, on observe un écrêtage des variations, laissant certaines petites portions de surface planes 109 entre certains billages 108.As can be observed in figure 9 , because of these conditions, a clipping of the variations is observed, leaving certain small flat surface portions 109 between certain beadings 108.

Ainsi d'une manière générale selon l'invention à partir d'une même équation sinusoïdale, notamment celle mentionnée ci-dessus, on peut ajuster les variations d'une surface inactive générant des rayons parasites de manière à diminuer au maximum ces rayons parasites dans le faisceau sortant de la pièce optique.Thus in a general way according to the invention from the same sinusoidal equation, in particular that mentioned above, it is possible to adjust the variations of a surface inactive generating parasitic rays so as to minimize these parasitic rays in the beam leaving the optical part.

Claims (10)

  1. Single-piece optical part (1) made of transparent or translucent material, comprising:
    - a plurality of active surfaces arranged to form a beam, including an entrance dioptric interface (2) and an exit dioptric interface (5),
    - inactive surfaces (6, 10) joining the active surfaces, one of the active surfaces is a deflector (3) arranged so as to receive the light rays coming from the entrance dioptric interface (2) and to steer them downstream,
    characterized in that at least one of the inactive surfaces comprising a scattering segment (7, 11) so as to scatter rays that reach it.
  2. Optical part (1) according to Claim 1, wherein the scattering segment (7, 11) is covered with a plurality of structures (8, 12) arranged so as to scatter the rays reaching the corresponding scattering segment.
  3. Optical part (1) according to Claim 1 or according to Claim 2, wherein the scattering segment (7, 11) is corrugated.
  4. Optical part (1) according to any one of the preceding claims, wherein the scattering segment (11) comprises striations (12) that are parallel to one another.
  5. Optical part (1) according to Claim 4, wherein the optical part is obtained by moulding, the striations (12) being parallel to the demoulding direction (D/D').
  6. Optical part (1) according to Claim 2 or according to any one of Claims 3 to 5 in combination with Claim 2, wherein the plurality of structures (8, 12) is formed by a periodic variation in the corresponding inactive surface (6, 10).
  7. Optical part (1) according to Claim 6, wherein the periodic variation in the scattering segment of the inactive surface or in at least one of the inactive surfaces is arranged solely in two variation directions that are transverse to each other.
  8. Optical part (1) according to Claim 7, wherein the optical part is obtained by moulding, the two variation directions being orthogonal to the demoulding direction (D/D') .
  9. Optical part (1) according to any one of Claims 6 to 8, wherein the periodic variations are defined by at least one sinusoidal function.
  10. Luminous vehicle device comprising an optical part (1) according to one of the preceding claims and at least one light source that emits its rays essentially towards said entrance dioptric interface.
EP19195640.8A 2018-09-28 2019-09-05 Single-piece optical part made of transparent or translucent material with inactive surface with diffusing portion Active EP3628915B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1858944A FR3086735B1 (en) 2018-09-28 2018-09-28 MONOBLOC OPTICAL PART IN TRANSPARENT OR TRANSLUCENT MATERIAL WITH INACTIVE SURFACE WITH DIFFUSING PORTION

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EP3628915B1 true EP3628915B1 (en) 2022-06-29

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EP (1) EP3628915B1 (en)
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Also Published As

Publication number Publication date
FR3086735A1 (en) 2020-04-03
US20200103087A1 (en) 2020-04-02
EP3628915A1 (en) 2020-04-01
CN110966569B (en) 2024-02-20
FR3086735B1 (en) 2021-06-25
CN110966569A (en) 2020-04-07
US11255504B2 (en) 2022-02-22

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