EP3628915B1 - Optisches monoblockteil aus durchsichtigem oder lichtdurchlässigem material mit inaktiver oberfläche, die einen lichtstreuenden abschnitt umfasst - Google Patents

Optisches monoblockteil aus durchsichtigem oder lichtdurchlässigem material mit inaktiver oberfläche, die einen lichtstreuenden abschnitt umfasst 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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English (en)
French (fr)
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EP3628915A1 (de
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)

Claims (10)

  1. Optisches Monoblockteil (1) aus transparentem oder transluzentem Material, umfassend:
    - eine Mehrzahl von aktiven Flächen, die dazu gestaltet sind, ein Bündel zu formen, darunter einen Eingangsdiopter (2) und einen Ausgangsdiopter (5),
    - inaktive Flächen (6, 10), die an die aktiven Flächen anschließen,
    wobei eine der aktiven Flächen eine Ablenkfläche (3) ist, die so gestaltet ist, dass sie die von dem Eingangsdiopter (2) kommenden Lichtstrahlen aufnimmt und nach stromab weiterleitet, dadurch gekennzeichnet, dass mindestens eine der inaktiven Flächen einen streuenden Abschnitt (7, 11) aufweist, so dass ihn erreichende Strahlen gestreut werden.
  2. Optisches Teil (1) nach Anspruch 1, bei dem der streuende Abschnitt (7, 11) mit einer Mehrzahl von Strukturen (8, 12) bedeckt ist, die so gestaltet sind, dass die den entsprechenden streuenden Abschnitt erreichenden Strahlen gestreut werden.
  3. Optisches Teil (1) nach Anspruch 1 oder nach Anspruch 2, bei dem der streuende Abschnitt (7, 11) gewellt ist.
  4. Optisches Teil (1) nach einem der vorhergehenden Ansprüche, bei dem der streuende Abschnitt (11) Riefen (12) aufweist, die parallel zueinander sind.
  5. Optisches Teil (1) nach Anspruch 4, bei dem das optische Teil durch Gießen erhalten wird, wobei die Riefen (12) parallel zur Entformungsrichtung (D/D') verlaufen.
  6. Optisches Teil (1) nach Anspruch 2 oder nach einem der Ansprüche 3 bis 5 in Kombination mit Anspruch 2, bei dem die Mehrzahl von Strukturen (8, 12) durch eine periodische Änderung der entsprechenden inaktiven Fläche (6, 10) gebildet wird.
  7. Optisches Teil (1) nach Anspruch 6, bei dem die periodische Änderung des streuenden Abschnitts der inaktiven Fläche oder mindestens einer der inaktiven Flächen nur entlang von zwei Änderungsrichtungen gestaltet ist, die quer zueinander verlaufen.
  8. Optisches Teil (1) nach Anspruch 7, bei dem das optische Teil durch Gießen erhalten wird, wobei die beiden Änderungsrichtungen senkrecht zur Entformungsrichtung (D/D') verlaufen.
  9. Optisches Teil (1) nach einem der Ansprüche 6 bis 8, bei dem die periodischen Änderungen durch mindestens eine sinusartige Funktion definiert werden.
  10. Fahrzeugleuchtvorrichtung, umfassend ein optisches Teil (1) nach einem der vorhergehenden Ansprüche und mindestens eine Lichtquelle, die ihre Strahlen im Wesentlichen zu dem Eingangsdiopter hin emittiert.
EP19195640.8A 2018-09-28 2019-09-05 Optisches monoblockteil aus durchsichtigem oder lichtdurchlässigem material mit inaktiver oberfläche, die einen lichtstreuenden abschnitt umfasst Active EP3628915B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1858944A FR3086735B1 (fr) 2018-09-28 2018-09-28 Piece optique monobloc en materiau transparent ou translucide a surface inactive avec portion diffusante

Publications (2)

Publication Number Publication Date
EP3628915A1 EP3628915A1 (de) 2020-04-01
EP3628915B1 true EP3628915B1 (de) 2022-06-29

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EP19195640.8A Active EP3628915B1 (de) 2018-09-28 2019-09-05 Optisches monoblockteil aus durchsichtigem oder lichtdurchlässigem material mit inaktiver oberfläche, die einen lichtstreuenden abschnitt umfasst

Country Status (4)

Country Link
US (1) US11255504B2 (de)
EP (1) EP3628915B1 (de)
CN (1) CN110966569B (de)
FR (1) FR3086735B1 (de)

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JP7278920B2 (ja) * 2019-10-08 2023-05-22 スタンレー電気株式会社 導光レンズ、レンズ結合体及び車両用灯具

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US11255504B2 (en) 2022-02-22
CN110966569B (zh) 2024-02-20
FR3086735A1 (fr) 2020-04-03
EP3628915A1 (de) 2020-04-01
US20200103087A1 (en) 2020-04-02
FR3086735B1 (fr) 2021-06-25

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