EP1416220A1 - Signalleuchte mit einem optichen System zur Sammlung und Verteilung des Lichtbündels nach einem ringförmigen Reflektor - Google Patents

Signalleuchte mit einem optichen System zur Sammlung und Verteilung des Lichtbündels nach einem ringförmigen Reflektor Download PDF

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Publication number
EP1416220A1
EP1416220A1 EP03292598A EP03292598A EP1416220A1 EP 1416220 A1 EP1416220 A1 EP 1416220A1 EP 03292598 A EP03292598 A EP 03292598A EP 03292598 A EP03292598 A EP 03292598A EP 1416220 A1 EP1416220 A1 EP 1416220A1
Authority
EP
European Patent Office
Prior art keywords
light
face
reflector
signaling
reflection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP03292598A
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English (en)
French (fr)
Inventor
Jean-Pierre Aynie
Jean-Claude Gasquet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Vision SAS
Original Assignee
Valeo Vision SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valeo Vision SAS filed Critical Valeo Vision SAS
Publication of EP1416220A1 publication Critical patent/EP1416220A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F21V7/0091—Reflectors for light sources 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
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/13—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source characterised by the type of light source
    • F21S43/14—Light emitting diodes [LED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/236—Light guides characterised by the shape of the light guide
    • F21S43/239—Light guides characterised by the shape of the light guide plate-shaped
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/236—Light guides characterised by the shape of the light guide
    • F21S43/241—Light guides characterised by the shape of the light guide of complex shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/242—Light guides characterised by the emission area
    • F21S43/245—Light guides characterised by the emission area emitting light from one or more of its major surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/247—Light guides with a single light source being coupled into the light guide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/30—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by reflectors
    • F21S43/31—Optical layout thereof
    • F21S43/315—Optical layout thereof 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
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/40—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the combination of reflectors and refractors
    • 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
    • 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 invention proposes a signaling light in particular for a motor vehicle.
  • the invention more particularly provides a signaling, in particular for a motor vehicle, comprising an optical axis oriented from rear to front, on which is located a light source which is intended to emit a flux bright forward, in a solid angle centered on the axis, and type comprising an optical device for recovering and distribution of the light rays emitted by the source, with a view to carry out a regulatory signaling function forwards, the optical device comprising a coaxial annular reflector and, in front of the light source, a central optical part called light engine, which is designed to distribute the rays light emitted by the source in directions generally transverse around the optical axis, towards the annular reflector coaxial which is intended to distribute the light rays, coming from of the light engine, towards the front, generally following a direction parallel to the optical axis, so as to achieve the regulatory signaling function.
  • Such a signaling light is for example known from document EP-A-1 182 395.
  • a traffic light performing a function of fog light must form, on a measurement screen placed ten meters, an image which has the overall shape of a rhombus.
  • This diamond is defined by characteristic points which are arranged on the measurement screen and which must receive each a light intensity whose value must be understood within a specified interval.
  • a traffic light carrying out a reversing light function must form on the measurement screen a rectangle of determined dimensions and whose length is parallel to the horizontal plane.
  • New types of traffic lights have been developed based on light sources appreciably point sources which emit a luminous flux in a solid angle of determined value.
  • This type of light source is generally a light emitting diode.
  • This type of light source is generally used in combination with a light pipe, or guide.
  • the traffic lights obtained from this combination have the disadvantage of having a range illuminating of great length, but of small width.
  • this type of traffic light requires generally several light sources to achieve a only signaling function.
  • the invention aims to remedy these drawbacks in particular by proposing a traffic light which can have a shallow axial depth, relative to the overall width of the frontal opening of the fire.
  • the signaling light according to the invention must allow the use of a substantially point light source such as than a light emitting diode, while having a luminance acceptable, to avoid dazzling users who can watch towards the traffic light.
  • Figures 1 to 8 show a signaling 10 which is carried out in accordance with a first mode for carrying out the invention.
  • the signaling light 10 includes an optical device 12 for recovering and distributing the light rays emitted by a light source 14, constituted here by a diode emitting.
  • the optical device 12 here has an overall shape of revolution around an optical axis A-A.
  • the diode 14 is arranged on the optical axis A-A, at the rear of the optical device 12.
  • Diode 14 has been shown mounted on a circuit board. support 16 which allows in particular its connection to a network power supply and to a control unit (not shown).
  • a so-called strong diode 14 is used.
  • power i.e. a diode whose light power is of several tens of lumens, for example greater than thirty lumens, which is to compare with the power less than ten lumens of so-called low power diodes.
  • the use of a such diode 14 makes it possible in particular to carry out the function of signaling by means of a single light source for each signaling light 10.
  • the high power diodes 14 are available in several colors, i.e. it is possible to choose the coloring of the light flux emitted by the diode 14. Preferably, we choose the color of the diode 14 according to the function of signaling to be carried out, for example red for a function anti-fog light, or white for a reversing light function.
  • Diode 14 has a diffusion globe at the front hemispherical 18 which is centered on the axis A-A and which is convex forward.
  • the device optic 12 is made of a transparent material having a refractive index higher than that of air, which here constitutes the ambient medium surrounding the optical device 12.
  • the optical device 12 is produced here in one piece by molding and machining, in a material transparent plastic such as, for example, polymethacrylate methyl (PMMA).
  • a material transparent plastic such as, for example, polymethacrylate methyl (PMMA).
  • the optical device 12 includes an annular reflector coaxial 20 and a central optical part called a light engine 22.
  • the light engine 22 is provided to distribute the rays luminous, emitted by diode 14, in directions generally transverse around the optical axis A-A, towards the coaxial annular reflector 20.
  • the adjective is used "Transversal" to qualify a direction which is close to a radial direction, relative to the optical axis A-A.
  • a ray transverse light can therefore be tilted slightly towards backward or forward with respect to a radial direction.
  • the coaxial annular reflector 20 is provided to distribute the light rays, coming from the light engine 22, towards the front, generally in a direction parallel to the optical axis A-A, so as to perform a regulatory function of signaling.
  • the light engine 22 has an inlet face 24, which is arranged axially opposite the globe 18 of the diode 14.
  • the profile of the inlet face 24, in axial section, is such that the majority of the light rays emitted by the diode 14 penetrates in the light engine 22.
  • the input face 24 has a coaxial central portion 26 forming a collimator, which has an overall shape hemispherical and convex backwards, and a portion coaxial annular device 28, which has an overall shape hemispherical and concave forward.
  • the hemispherical profile of the central portion 26 of the face input 24 is such that the majority of the light rays received, in from the diode 14, refracts inside the motor light 22 by being deflected, so that these light rays enter the light engine 22 in a direction substantially parallel to the optical axis A-A.
  • peripheral hemispherical portion 28 of the face input 24 is centered on the diode 14, so that the majority of the light rays received by the portion 28, in from the diode 14, refracts inside the motor light 22 without being deflected.
  • the light engine 22 has a rear face of reflection 30 of concave parabolic annular shape.
  • the rear reflection face 30 is designed to reflect axially forward, according to the principle of total reflection, the light rays that enter the light engine 22 by the peripheral portion 28 of the input face 24.
  • the focus F1 of the parabola forming the rear reflection face 30 is substantially coincident with the light source 14.
  • the light engine 22 has a front face of reflection 32 of generally conical convex and coaxial shape.
  • the reflection front face 32 is designed to reflect, according to the principle of total reflection, the light rays which run inside the light engine 22, towards a face of exit 34.
  • the reflection front face 32 has a portion conical central unit 36 which is arranged here axially opposite the input face 24 and axially facing part of the rear reflection face 30.
  • the angle at the top ⁇ of the conical portion 36 is here about ninety degrees, so that the rays which reach this portion 36, and which are parallel to the optical axis A-A, are reflected radially outwards.
  • the axial section 38 of the outlet face 34 which is arranged radially opposite the conical portion 36, has a substantially cylindrical shape, so that the spokes luminous radials, which are reflected by the conical portion 36, are substantially orthogonal to the axial section 38 of the face of exit 34, so that they cross the exit face 34 overall without being diverted.
  • the reflection front face 32 has a portion peripheral annular 40 which is adjacent to the conical portion 36, and which is arranged axially opposite a part of the rear reflection face 30.
  • the peripheral annular portion 40 has a shape globally parabolic, the focal point F2 of the parabola being arranged here on the optical axis A-A, axially at the height of the fitting 42 between the conical portion 36 and the parabolic portion 40.
  • the axial light rays which reach the portion parabolic 40 of the reflection front face 32 are reflected towards outside, following a direction which passes through the focal point F2.
  • the axial section 44 of the outlet face 34 which is arranged radially opposite the portion parabolic 40, has a substantially hemispherical shape centered on the focal point F2, so that the light rays, which are reflected by the parabolic portion 40 outwards, substantially orthogonal to the axial section 44 of the outlet face 34, so that they cross the exit face 34 without being deflected.
  • the input face 24, the reflection faces 30, 32, and the outlet face 34 are located at the interface between the transparent material constituting the light engine 22 and the air ambient.
  • the reflection faces 30, 32 are said to be respectively concave and convex, from the point of view of the rays lights that run inside the light engine 22.
  • the light engine 22 has a peripheral annular portion 46 which extends transversely outwards.
  • This portion annular 46 is arranged here axially between the rear face of reflection 30 and the cylindrical section 38 of the outlet face 34.
  • the annular portion 46 has an outlet front face 48 generally transverse which is provided with circular grooves 50 coaxial, along the optical axis A-A, forming dioptres of refraction.
  • the circular ridges 50 are designed to refract, axially forward, part of the light rays coming from of the peripheral portion 28 of the input face 24.
  • rear face 52 of the annular portion 46 is here optically neutral, since it is not intended for receive light rays from the source 14.
  • the coaxial annular reflector 20 here extends axially forward, and transversely outward, from the edge outer peripheral 54 of the annular portion 46.
  • the rear face 56 of the reflector 20 has a section tapered rear axial 58, with apex angle equal to that ( ⁇ ) of the conical portion 36 of the light motor 22, which is arranged radially opposite the cylindrical section 38 of the face of light motor output 34 22.
  • the frusto-conical section 58 here extends axially beyond of the cylindrical section 38, towards the rear, to connect to the annular portion 46 of the light engine 22.
  • the rear face 56 of the reflector 20 has a section substantially parabolic front axial 60, which is adjacent to the tapered section 58.
  • the focal point of the parabola corresponding to the parabolic section 60 is substantially coincident with the hearth F2, so that the light rays coming out of the engine light 22 through the hemispherical section 44 of the outlet face 34 are reflected, axially forwards, by the section parabolic 60.
  • the front face 62 of the reflector 20 is staggered axially, from rear to front, and transversely, from inside to outside. It has a rear axial section 64, which is arranged radially opposite the section frustoconical 38 of the outlet face 34 of the light engine 22, and a front axial section 66.
  • the rear section 64 of the front face 62 delimits, in axial section, a series of "steps", each comprising an axial portion 68 and a radial portion 70.
  • the rear section 64 being arranged opposite the section cylindrical 38, it receives radial light rays in from the light engine 22, which pass through the portions axial 68 orthogonally.
  • the front section 66 of the front face 62 delimits, in axial section, a series of "steps", each comprising a hemispherical portion 72, which is centered on the focal point F2, and a radial portion 74.
  • the front section 66 extends axially forwards, beyond of the light engine 22, so as to collect the majority light rays which emerge from the light engine 22 through the hemispherical portion 44 of the outlet face 34.
  • the light rays R1 which are emitted by the diode 14 in a solid angle centered on the optical axis A-A and delimited by the circumferential edge of the central portion 26 of the entry face 24, refract through the central portion 26 forming collimator, so that they enter the light engine 22 in a direction parallel to the optical axis A-A.
  • the rays R1 then reach the conical portion 36 of the reflection front face 32. Like this conical portion 36 forms an angle of ninety degrees, the radii R1 are reflected outward in a radial direction.
  • the rays R1 After reflecting on the conical portion 36, the rays R1 refract through the cylindrical portion 38 of the face of exit 34, without deviated beings.
  • the rays R1 then refract to through the axial portions 68 opposite the rear section 64 from the front face 62 of the reflector 20, without being deflected.
  • the Rays luminous R1 then reach the frustoconical section 58 of the face rear 56 of the reflector 20, which reflects these rays R1 axially forward.
  • R1 rays exit the reflector 20 through the portions radial 70 or 74 of the front face 62, in directions globally axial.
  • part R2 is reflected on the rear face of reflection 30, in an axial direction, since the focus F1 of the parabola forming the rear reflection face 30 is coincident with the center of the diode 14.
  • the light rays R2 are then reflected, either on the conical portion 36 of the reflection front face 32, ie on the parabolic portion 40 of the front reflection face 32.
  • the rays R2 reach the conical portion 36, they then follow the same type of trajectory as the rays R1, leaving the light engine 22 by its section cylindrical 38, in a substantially radial direction.
  • the rays R2 which exit from the light engine 22 through the hemispherical portion 44, enter the reflector 20 while refracting through the hemispherical portions 72 of the section front 66 of its front face 62.
  • the rays R2 enter the reflector 20 without deflected beings, and they are reflected, axially forward, on the parabolic section 60 of the rear face 56 of the reflector 20.
  • the rays R2 exit from the reflector 20 while refracting axially through the radial portions 74 of the front section 66 of the front panel 62.
  • R3 of light rays which enter the light engine 22 through the peripheral portion 28 of the face input 24, directly reach the circular striations 50 of the transverse portion 46 of the light engine 22.
  • the streaks circular 50 cause the refraction of R3 rays, axially forward.
  • R3 rays are therefore emitted directly forward by the light engine 22, without passing through the reflector 20.
  • the light engine 22 letting subsist on its external surface which corresponds to the reflection front face 32, machining imperfections and / or polishing, so that part of the light rays which travel inside the light engine 22 refract directly axially forward, across the front of reflection 32.
  • Figure 3 there is shown schematically in perspective the frustoconical portion 36 of the front reflection face 32 of the light engine 22, and in Figure 4 there is shown schematically the spatial distribution of the light beam produced by the traffic light 10 in FIG. 2, on a screen placed at the front.
  • Such a light distribution is not suitable for all regulatory signaling functions, in particular, it does not not suitable for a fog light function, which should form a beam generally in the form of a diamond or a cross.
  • the invention advantageously proposes that minus an axial section of the front reflection face 32 either obtained by anamorphosis, so that the distribution of light rays towards the reflector 20 is not uniform according to all transverse directions around the optical axis A-A.
  • FIG. 5 there is shown schematically in perspective a portion 76 of the reflection front face 32, which is obtained by anamorphosis, and which is intended to replace the conical portion 36 shown in FIGS. 2 and 3.
  • the reflection face portion 76 here comprises four adjacent faces 78, 80, 82, 84 which are evenly distributed around the optical axis A-A and which generally have the same dimensions.
  • Each face 78, 80, 82, 84 corresponds globally to a portion of frustoconical face.
  • parabolic portion 40 of the front face of reflection 32 can also be replaced by a surface obtained by anamorphosis. Such a surface would then have four sides in the shape of a parabola portion.
  • FIG 6 the shape is shown schematically of the light beam obtained by means of a signaling light 10 comprising a “anamorphic” reflection front face 32.
  • the light beam forms a cross.
  • Each branch of the cross corresponds to a part of the luminous flux which has passed by one of the faces 78, 80, 82, 84 of the face portion of reflection 76.
  • the reflection face portion 76 delimits a radial central face 85 which allows the refraction of part of the light rays directly forward, near the axis optics A-A, so as to avoid the presence of a "black hole" at the center of the light beam.
  • a regulatory signaling beam is produced of specific shape, in particular a fog light, in fitting on the radial portions 70, 74 of the front face 62 of the reflector 20, and / or on the circular stripes 50, patterns dioptrics, or toric patterns, elementary which are intended for individually form an elementary light beam whose shape is adapted to the signaling function to be performed.
  • Such diopter patterns will be described more precisely below, in reference to another embodiment.
  • FIGS. 7 and 8 two variants of the first embodiment of the invention, in which the shape of the reflector 20 has been modified.
  • the face front 62 of reflector 20 is coated with a reflective material 86, for example based on aluminum.
  • the profile of the front face 62 in axial section, broadly corresponds to the profile of the rear face 56 of the figure 2, that is to say that the front face 62 has an axial section tapered rear 88 which is arranged radially opposite the cylindrical portion 38 of the light engine 22, and a section axial front parabolic 90.
  • the light rays which exit the light engine 22 through its outlet face 34, reflect directly on the front face 62 of the reflector 20, and they are generally returned axially forward.
  • the front face 62 of the reflector 20 comprises a section rear axial 92 which is staggered and which has facets annulars 94 of frustoconical profile, so as to reflect, axially forward, the radial light rays R1 coming from the cylindrical section 34 of the light engine 22.
  • the facets 94 are separated here by radial portions 96.
  • the front face 62 also includes a front axial section 98, which is staggered and which has annular facets 100 of generally parabolic profile, so as to reflect, axially towards the front, the light rays R2 coming from the section hemispherical 44 of the output face 34 of the light engine 22.
  • the facets 100 are separated here by portions 102 tilted forward and outward.
  • the rear face 56 of the reflector 20 has no function optical and it can therefore have any profile.
  • the profile of the rear face 56 of the reflector 20 is generally hemispherical.
  • portions 96 and 102 are not designed here to receive and reflect light rays from the motor 22, this is why they are arranged outside the path light rays R1, R2.
  • the reflector 20 can by example be made of a non-transparent material, coated of a reflective material on its front face 62, in accordance to the variant embodiments of FIGS. 7 and 8.
  • the input face 24 of the light engine 22 here has a hemispherical shape, concave forward, which is centered on the diode 14.
  • the input face 24 is here complementary to the globe hemispherical 18 of diode 14.
  • the light engine 22 has a rear face of reflection 104 of globally parabolic shape, which is similar to the rear reflection face 30 of the first embodiment.
  • the focal point F1 of the parabola corresponding to the rear face reflection 104 is arranged here in the center of the diode 14, of way that the light rays, which enter the engine of light 22 without being deflected, are reflected axially towards the front by the rear reflection face 104.
  • the light engine 22 has a front face of reflection 32 of generally frustoconical shape, the top of the truncated cone being arranged at the rear.
  • the reflection front face 32 delimits, at its end rear axial, a radial central face of light diffusion 106.
  • the central diffusion face 106 comprises a series of elementary dioptric patterns 108, which are provided to form individually, from the spokes bright they receive on their back side, a beam elementary light, directed generally axially forward, and whose shape is adapted to the signaling function to achieve.
  • Each elementary dioptric pattern 108 can be compared to a diopter, or prism, and it forms a domed facet, here concave rearward.
  • each dioptric pattern 108 The concave, or curved, shape of the surface forming each dioptric pattern 108 is determined so that the rays bright, coming from the entry face 24 of the light engine 22, refract through the dioptric pattern 108 while being distributed spatially forward, and forming a beam at the front lighting carrying out the chosen signaling function.
  • each pattern diopter 108 deflects and distributes the light rays it receives, from so as to realize at the front, on a measurement screen, an image globally diamond-shaped
  • the front reflection surface 32 has a series of patterns Elementary "catadioptrics" 110, which are distributed here regularly around the optical axis A-A.
  • the front reflection surface 32 here comprises three crowns concentric 112, 114, 116, each formed by a series of circumferentially adjacent catadioptric patterns 110.
  • each catadioptric pattern 110 has two flat faces 118, 120, which are inclined between them by an angle ⁇ of approximately forty-five degrees.
  • the angle ⁇ favors the re-orientation of the ray R5r to the reflector areas.
  • the angle formed by the two inclined faces 118, 120 has a truncation which forms a facet 122 narrow and extending over the entire length of the retro-reflecting pattern 110.
  • Veneer 122 is generally parallel to the shape general frustoconical of the front face of reflection 32, and it is arranged in front of the catadioptric motif 110.
  • Each catadioptric pattern 110 extends globally over the entire axial thickness of the associated crown 112, 114, 116.
  • Each crown 112, 114, 116 therefore forms, at the front of the engine light 22, an annular surface "accordion".
  • the output face 34 of the light engine 22 is here combined with the reflection rear face 104, as shown will understand later in the explanation of the operation of the light engine 22 according to the second embodiment.
  • the annular reflector 20 has a profile similar overall to that of the annular reflector 20 of FIG. 8.
  • the reflector annular 20 therefore has a reflection front face 62 which is stepped axially forward and radially outward, and which is coated with a reflective material.
  • the front face 62 has reflection facets elementary 124. These facets of reflection 124 are here generally tilted forward and outward, so to reflect, generally axially forward, the rays light coming from the exit face 104 of the light engine 22.
  • the reflection facets 124 are here arranged in concentric crowns 126, and they are distributed circumferentially so that they are adjacent circumferentially two by two.
  • Each facet of reflection 124 is curved, and it has here a generally concave rearward profile.
  • the concave shape, or curve, from the surface forming each reflection facet 124 is determined globally in the same way as the shape of dioptric patterns 108 of the central diffusion face 106.
  • the shape and the inclination of the reflection facets 124 hold account of the angle of incidence of the light rays, coming from the light engine 22, on the front face 62 of the reflector 10. This angle of incidence depends in particular on the axial position of the facets 124 relative to the output face 104 of the motor light 22.
  • mathematical algorithms allow calculate, by progressive "morphing", the appropriate form for each reflection facet 124, as a function of its position angular around the optical axis A-A.
  • the operation of the signaling light 10 according to the second embodiment is as follows.
  • a first part R4 of the light rays those which are closest to the optical axis A-A, reaches the central face of diffusion 106, where R4 rays are transmitted directly to the front, through the dioptric patterns 108, forming elementary beams of form adapted to the function of fire signaling 10.
  • a second part R5 of the light rays is reflected axially forwards by the rear reflection face 104. These R5 light rays then reach the retro-reflecting patterns 110.
  • part R5r of the rays luminous R5 is reflected for the first time on a face 118 of a catadioptric pattern 110, then a second time on the other side 120 of the catadioptric pattern 110, so that the light rays R5r are finally returned by the catadioptric pattern 110 to the rear reflection face 104.
  • R5r light rays which are reflected by the patterns retro-reflectors 110, reach the rear reflection face 104 with an angle of incidence y close to ninety degrees, so that they refract through this face 104 which becomes face Release.
  • the light rays R5r come out of the light engine 22 by the outlet face 104 in directions inclined towards rear and outward facing.
  • R5r rays reach the reflection facets 124 of the annular reflector 20, on which they are reflected to form forward a series of elementary beams, of which the shape is adapted to the light signaling function 10.
  • part R5t of the rays light R5 refracts through facet 122 of the pattern catadioptric 110, and this part R5t is therefore transmitted directly forward.
  • the facets 122 which are produced in the patterns catadioptric 110, allow a minimum of light through the reflection front face 32, so as to obtain a substantially uniform light distribution at the front traffic light 10.
  • Figures 12 and 13 show a first and a second variant of the traffic light 10 according to the second embodiment.
  • the light engine 22 is similar to that which has been described with reference to FIGS. 9 to 11, but the annular reflector 20 is different.
  • the reflector annular 20 is here made of a transparent material, and the reflection of the R5r light rays coming from the light 22 is not made on the front face 62 but inside the annular reflector 20, on its rear face 56.
  • the front face 62 of the reflector 20 is substantially smooth and overall in shape parabolic.
  • the rear face 56 has a coating of material reflective and a series of 126 facets of reflection which are generally performed according to the same principle as the facets reflection 124 of Figure 10.
  • the reflection facets 126 here form bosses convex on the rear face 56 of the reflector 20.
  • R5r light rays distributed globally transversely towards the annular reflector 20 by the face of light engine outlet 104, refract inside the reflector 20, through the front face 62, then they are reflected, forward, on the reflection facets 126 of the rear face 56, and finally they refract, generally axially forward, through the front face 62.
  • the front face 62 of the reflector 20 is similar in shape to that of the annular reflector 20 of FIG. 10, that is to say that it has elements 128 similar in profile to facets 124, but the front face 62 does not has no reflective coating.
  • Elements 128 form dioptric patterns of the same type as the dioptric patterns 108 of the central diffusion face 106 of the light engine 22.
  • the rear face 56 of the annular reflector 20, which does not has no reflective coating, has patterns two-sided catadioptric 130 that are similar to the patterns catadioptric 110 of the light motor 22.
  • the retro-reflecting patterns 130 of the reflector 20 do not have no truncation and their two faces here describe a angle ⁇ of approximately ninety degrees between them.
  • R5r light rays distributed globally transversely towards the annular reflector 20 by the face of light engine outlet 104, refract inside the reflector 20, through the dioptric patterns 128 of its face before 62, then they reflect on both sides of a pattern catadioptric 130 of the rear face 56, and finally they refract, generally axially forward, across the patterns diopters 128 of the front face 62.
  • An advantage of this second variant is that it does not no reflective coating on the reflector annular 20, which acts on the light rays R5r only by refraction and total reflection inside the material.
  • optical part 12 of the signaling light 10 is preferably carried out in two parts, the light engine 22 being attached by relative to the reflector 20, as shown in the figures, so as to facilitate the production of the optical part 12 by molding.
  • FIG 14 there is shown a signal light 10 which is carried out in accordance with a third embodiment of the invention.
  • This third embodiment includes a reflector coaxial annular 20 which is, for example, of the same type as that which has been described with reference to the second embodiment and in FIG. 10.
  • the coaxial annular reflector 20 therefore comprises a series of reflection facets 124 arranged in the form of staggered crowns.
  • the third embodiment stands out mainly by its light engine 22 which has the overall shape of a hollow hemispherical globe centered on the source luminous 14.
  • the shape of the light motor 22 is here similar to that of an optical device called a windscreen, which is commonly used in traffic lights.
  • the concave rear face of the light engine 22 forms the input face 24 for the light rays emitted by the source 14.
  • the convex front face of the light engine 22 forms, in its central part, a light diffusion face 132, and in its peripheral part, an outlet face 134.
  • the input face 24 has a central area 136 forming a Fresnel optic.
  • the central area 136 of the face input 24 therefore has 138 coaxial annular steps to axis A-A.
  • Each of the levels 138 of the central area 136 comprises a first generator 140 substantially parallel to the axis A-A, and a second generator 142 inclined relative to axis A-A.
  • step 138 The closer the step 138 is to the A-A axis, the more inclined generator 142 is close to a radial direction.
  • the portion 144 of the central zone 136 closest to the axis A-A has a substantially radial profile.
  • the light diffusion face 132 is arranged substantially vis-à-vis axially of the central zone 136. It has elementary dioptric patterns 146, for example of convex profile, which are intended to distribute spatially towards the front the light rays received by the central zone 136, from so as to produce elementary light beams whose shape is adapted to the signaling function to be performed.
  • elementary dioptric patterns 146 for example of convex profile, which are intended to distribute spatially towards the front the light rays received by the central zone 136, from so as to produce elementary light beams whose shape is adapted to the signaling function to be performed.
  • the elementary dioptric patterns 146 are, for example, similar to the dioptric patterns 108 which have been described in reference to the second embodiment ( Figure 10).
  • the input face 24 has an annular zone device 148 which has coaxial annular steps 150, similar to the levels 138 of the central area 136.
  • the steps 150 of the peripheral annular zone 148 here includes a generator 152 substantially parallel to the axis A-A and a generator 154 inclined relative to the axis A-A.
  • the inclination of the generator 154 increases and approaches a radial direction.
  • the peripheral annular zone 148 has a portion end device 156 in profile substantially hemispherical.
  • the output face 134 of the light engine 22 is associated to the peripheral annular zone 148 of the entry face 24. It has here a generally hemispherical profile and it is arranged generally radially opposite an axial section of the coaxial annular reflector 20.
  • the light diode 14 emits light rays towards the input face 24 of the light engine 22.
  • a first part R4 of the light rays those which are closest to the optical axis A-A, reaches the central area 136 of the entry face 24.
  • These rays R4 refract through the light engine 22 up to the light diffusion face 132, which transmits them globally axially forward, forming elementary signaling beams, thanks to the patterns dioptrics 146.
  • a second part R6 of the light rays reaches the area peripheral annular 148 of the entry face 24. These rays R6 refract through the peripheral annular zone 148, then at through the outlet face 134 which distributes them adequately towards the reflection facets 124 of the coaxial annular reflector 20.
  • the coaxial annular reflector 20 distributes the light rays R6 axially forward, so as to produce a beam regulatory signage.
  • step 138 the light rays R4 which reach the area central 136, refract forward through the portions inclined 142 of steps 138.
  • the axial portion 140 of step 138 is globally optically neutral, since it is not intended to transmit light rays.
  • the optical device forming light engine 22 is integrated into the light source, here in the light emitting diode 14.
  • the light scattering globe 18 is therefore replaced by a light motor 22 of suitable shape for distributing the light rays generally radially towards the reflector coaxial annular 20.
  • the light engine 22 can take different forms, such as the forms described with reference to the modes of previous achievements.
  • the light engine 22 here has a shape overall frustoconical, the top of which is arranged at the rear.
  • the truncated cone forming the light engine 22 a by example an opening between 40 and 120 ° relative to the axis optics A-A.
  • the light engine 22 has a front face of reflection 158 of conical shape, and a frustoconical exit face 160, which is arranged globally radially opposite a axial section of the reflector 20.
  • the signal light 10 here includes a reflector coaxial annular 20 which is similar to that described in reference to the second embodiment ( Figure 10).
  • the light rays emitted by the diode 14 are reflected inside the light engine 22, on the front face 158, by total reflection and then they refract through the exit face 160, which distributes them towards the reflection facets 124 of the coaxial annular reflector 20.
  • This embodiment makes it possible in particular to carry out the light engine 22 in one piece with the diode 14, which decreases the number of parts needed to make the fire signaling 10.
  • the signaling light 10 according to the invention in particular the various embodiments described above, have many advantages.
  • the signaling light 10 according to the invention simplifies the injection of material and reduces injection time, during production of the optical part 12 by molding.
  • the signaling light 10 requires a small amount of material and a small thickness of material, to produce the optical part 12, with respect to the lights signaling using conventional light pipes.
  • the signaling 10 is optically autonomous, i.e. it can perform a regulatory signaling function without require the addition of another distribution device luminous, such as a striated diffusion glass.
  • the signaling light 10 is preferably arranged behind a protective glass, which can be neutral optically.
  • Yet another advantage of the invention is that it is possible to make several signal lights 10 of forms different, especially externally, by modifying only the shape of the reflector 20, while using the same light engine 22. This makes it possible to standardize the parts of the signal light 10 and decrease the manufacturing costs of the signaling light 10.

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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)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Led Device Packages (AREA)
  • Led Devices (AREA)
EP03292598A 2002-10-28 2003-10-17 Signalleuchte mit einem optichen System zur Sammlung und Verteilung des Lichtbündels nach einem ringförmigen Reflektor Withdrawn EP1416220A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0211348A FR2846400B1 (fr) 2002-10-28 2002-10-28 Feu de signalisation comportant un dispositif de recuperation et de repartition du flux lumineux vers un reflecteur annulaire
FR0211348 2002-10-28

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EP1416220A1 true EP1416220A1 (de) 2004-05-06

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US (1) US6953271B2 (de)
EP (1) EP1416220A1 (de)
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FR3125860A1 (fr) * 2021-07-30 2023-02-03 Valeo Vision Module d’eclairage bi-led avec piece optique transparente mince
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FR2846400A1 (fr) 2004-04-30
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US6953271B2 (en) 2005-10-11
US20040141323A1 (en) 2004-07-22

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