EP2199662A1 - Verbesserter Beleuchtungsmodul für Kraftfahrzeuge - Google Patents

Verbesserter Beleuchtungsmodul für Kraftfahrzeuge Download PDF

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Publication number
EP2199662A1
EP2199662A1 EP09179737A EP09179737A EP2199662A1 EP 2199662 A1 EP2199662 A1 EP 2199662A1 EP 09179737 A EP09179737 A EP 09179737A EP 09179737 A EP09179737 A EP 09179737A EP 2199662 A1 EP2199662 A1 EP 2199662A1
Authority
EP
European Patent Office
Prior art keywords
folder
point
reflector
edge
curvature
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.)
Granted
Application number
EP09179737A
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English (en)
French (fr)
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EP2199662B1 (de
Inventor
Pierre Albou
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
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Valeo Vision SAS
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Filing date
Publication date
Application filed by Valeo Vision SAS filed Critical Valeo Vision SAS
Publication of EP2199662A1 publication Critical patent/EP2199662A1/de
Application granted granted Critical
Publication of EP2199662B1 publication Critical patent/EP2199662B1/de
Not-in-force 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
    • F21V7/04—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
    • F21S41/10—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
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • F21S41/26—Elongated 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
    • F21S41/321—Optical layout thereof the reflector being a surface of revolution or a planar surface, e.g. truncated
    • 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
    • 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
    • F21S41/40—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades
    • F21S41/43—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades characterised by the shape thereof
    • 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
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/12—Combinations of only three kinds of elements

Definitions

  • the invention relates to a lighting module for a motor vehicle headlamp, giving a cut-off light beam, of the kind comprising a concave reflector, at least one light source arranged in the concavity of the reflector to illuminate, in particular at least one upwards, and a lens situated in front of the reflector and the light source, the reflector being associated with a folder, in particular a horizontal folder, the upper surface of which is reflective for folding the beam coming from the reflector, said folder having an edge of clean front end to form the cut in the lighting beam.
  • folding is meant a substantially flat and reflective plate.
  • a lighting module of the kind defined above is known from the patent EP-A-1 610 057 .
  • Such a module makes it possible to obtain a very wide illumination beam with a clean cut across the entire width of the beam.
  • This kind of module is well suited for lighting systems combining several modules with different optical axes and curvatures.
  • a fog lamp generally uses two or three of these modules to give a light beam with a satisfactory distribution of illumination over the entire angular extent of the beam, in particular towards the angular limits of the beam.
  • the object of the invention is, above all, to propose a module of the kind defined previously which makes it possible to obtain a beam in which the distribution of the light is improved in order to increase the illumination of the angular extreme zones, in particular those located at about ⁇ 35 ° C. ° on either side of the optical axis, without reducing the illumination of the central zone located substantially between + 10 ° and -10 ° on either side of the optical axis.
  • the invention also aims to provide a sufficiently improved lighting module to constitute alone a fog lamp meeting the requirements imposed.
  • the curvature of the front edge of the folder has, in particular, at least a maximum angularly located between the optical axis of the module and an angular limit of the beam.
  • the curvature of the front edge of the folder has a maximum on each side of the optical axis.
  • the front edge of the folder is symmetrical with respect to this optical axis.
  • the curvature of the front edge of the folder has a secondary maximum located on or substantially on the optical axis.
  • the wave surface coming from the source is comparable to a spherical wave surface
  • the maximum curvature of the front edge of the folder is selected so that the illumination of the extreme angular zones of the beam, in particular in directions greater than or equal to ⁇ 35 ° on either side of the optical axis, is reinforced, without reducing the illumination of the central area.
  • the surface of the reflector is such that light rays coming from the source and falling at points situated on the intersection of this surface and a normal vertical plane at the front edge of the folder, but separated from the source, are reflected in this vertical plane so as to converge at a point located at the intersection of the vertical plane and the edge of the folder.
  • the lighting module is provided so that the illumination in the central zone between -10 ° and + 10 ° on either side of the optical axis is maintained with respect to a basic module whose folder would have a circular front edge of radius equal to the mean radius of curvature of the front edge, while the areas located at -35 ° and + 35 ° on either side of the optical axis, and corresponding to lines listed 9 -1 and 9-2 according to the R19-3 standard, have a higher illumination than that obtained with said basic module.
  • the cut-off beam obtained is flat-cut, in particular being chosen between an anti-fog beam and a flat-cut code beam portion.
  • the invention also relates to a projector comprising at least one module as defined above.
  • the light source S is advantageously substantially punctual, in particular formed by a light-emitting diode enveloped by a globe or a hemispherical capsule, this diode having a light-scattering axis substantially orthogonal to the folder 4, and illuminating upwards.
  • the front edge of the folder is given the shape of a plane curve with variable curvature. , whose curvature at a point is a continuous function of the distance x, or lateral coordinate, from this point to the optical axis Y, for the point considered.
  • this part 5a corresponds to a circular arc of constant radius, centered on the optical axis Y.
  • the ends of the arc 5a are connected, respectively, to an arc 5b1, 5b2 having a higher curvature.
  • the radius of curvature (inverse of the curvature) of the arcs 5b1, 5b2 is smaller than that of the central part 5a.
  • a portion 5c1, 5c2 provides the connection between the ends of the zones 5b1, 5b2 with strong curvature with end arcs 5d1, 5d2 convex forward, having a curvature less than or equal to that of the central portion 5a.
  • the intermediate zones 5c1, 5c2 are of variable convexity with respect to the adjacent zones. All of these areas “recedes" with respect to the circle of radius Ra as represented in figure 5 .
  • Areas with a high curvature 5b1, 5b2 make it possible to spread the beam laterally and to reinforce the illumination in the extreme angular zones, for example at ⁇ 35 ° on either side of the optical axis Y, by decreasing the intensities in the intermediate zones, and without affecting the central part of the beam whose illumination mainly depends on the central zone 5a of the curve.
  • the area of the curve corresponding to the angles of the lines 8 according to the figure 6 5b) are small, the angles evolve rapidly with x, because of the strong curvature, so that there is more room for zones 5d, where the angles "more slowly” depending on x.
  • the central portion of the beam generally corresponds to an angle of ⁇ 10 ° on either side of the optical axis and the angular extent of the central portion 5a of the folder is sufficient to ensure the desired intensity in the range ⁇ 10 °.
  • the figure 4 represents the position of the centers of curvature for the different zones represented in figure 5 .
  • C is the circle of radius Ra.
  • O is the center of curvature for area 5a of radius Ra.
  • 01 is the center of curvature for zone 5d2 of radius Rd.
  • 02 is the center of curvature for the point of minimum radius of curvature (Rb), a point located at the end of zone 5b2.
  • Rb minimum radius of curvature
  • Fig. 5 illustrates the variation of the radius of curvature R at a point of the curve 5, as a function of its lateral distance, that is to say its distance x to the optical axis, range on the abscissa.
  • the radius R carried on the ordinate, corresponds to the inverse of the curvature. It appears that the radius R passes through two minimum values Rb, on either side of the optical axis, corresponding to the points of greatest curvature of parts 5b1, 5b2.
  • the central portion has a radius of curvature Ra constant in the example and the end parts a higher radius of curvature Rd also constant.
  • the reflector 2 is determined to transform a spherical wave surface from the light source S into a wave surface returning to the curve 5 of the edge of the folder.
  • Folder edge 5 is a solution of a differential equation involving the radius of curvature R (x) as discussed further, which solution can be found numerically by choosing an arbitrary point of the edge 5.
  • the position from the source S being known, we take the point My ( Fig.2 ) of the edge belonging to the optical axis Y of the module, which axis passes through the center of the source; this reduces the choice of the point of passage to that of a simple real parameter, similar to the distance between foci in an ellipsoid.
  • the reflector 2 is determined by a family of curves 2m, each curve 2m corresponding to the intersection of the reflector with a plane Em normal to the edge 5 at a current point M. Each curve 2m is located in a plane Em. The family of the curves 2m is obtained by moving the plane Em perpendicular to the edge 5.
  • a 2m curve must have the following property.
  • the points P, P1 are located on the curve 2m, which is such that the rays i, i1 are reflected along radii r, r1 pointing towards the point M of the edge 5.
  • the rays reflecting r, r1 are therefore contained in the plane Em.
  • the reflector 2 can thus be calculated as a parametric surface in x (dimension of a point M on the edge 5 of the bender, along the axis X) and according to the angle ⁇ , this angle being that formed between a radius such that r1, returned by the reflector 2 and falling on the edge 5 at the point M, and the plane of the folder (see Fig. 2 ).
  • the lens 3 can be determined as follows.
  • the section, or intersection, 3Em of the lens 3 with the plane Em defined above, corresponds to the section of a stigmatic lens between the point M of the folding edge 5 of the folder and the infinite, this plane containing the axis of the stigmatic lens.
  • This section 3Em is delimited by two dioptres: a diopter of entry 3Eme, and a dioptre of exit 3Ems.
  • the material, glass or transparent plastic, of the section 3Em is between these two diopters.
  • this input diopter is constituted by a circular arc in the plane Em, convex towards the rear, of center ⁇ ( Fig.3 ) in the plane of the bender 5.
  • the output diopter 3Ems is calculated so that a light ray u1, coming out of the lens 3 and coming from an incident ray q1 coming from the point M, is parallel to the horizontal plane of the folder 5.
  • the lens 3 could be parameterized in the same way as the reflector, but a mesh in (x, h), h being the height of the points on the input face of the lens (see Fig. 2 and 3 ) allows a simpler calculation.
  • the lens 3 is not revolution, especially around a vertical axis.
  • Fig. 6 schematically illustrates the network of isolux curves obtained on a screen, generally at a distance of 25 m, with a module according to the invention.
  • the illumination in the central zone between -10 ° and + 10 ° on either side of the optical axis is not decreased compared to a module whose folder would have a circular front edge of radius equal to the radius means of curvature of the edge 5 according to the invention.
  • the zones situated approximately at -35 ° and + 35 ° on either side of the optical axis, and corresponding to the lines listed 9-1 and 9-2 according to the R19-3 standard, have a higher illuminance. higher than that of a module with a folding machine in an arc. Areas in which light has been taken to be transferred to lines 9-1 and 9-2 correspond to substantially at intermediate lines 8-1 and 8-2 between the central zone and the extreme zones.
  • the invention thus allows optimization, in particular by the choice of R (x) from which the curve f (x) describing the front edge 5 of the folder is deduced, and offers greater flexibility.
  • the optimization can result from comparative calculations made with different equations f (x) for curve 5.
  • a module according to the invention can also serve as a basic module for a code projector.
  • the angle ⁇ designates the angle between MI and the horizontal.
  • ⁇ designates the center of the arc forming the input diopter 3Eme, ⁇ being located in the plane of the folder.
  • the angle between ⁇ I and the horizontal is designated ⁇ .
  • the figure 10 which represents the curve 5 in plan view, represents the trace of the plane normal to the points M of coordinates x 1 and x o
  • ⁇ (x) remains low (in particular less than 3.5 °)
  • the beam is improved without compromising compliance with the standards, in particular those concerning fog lamps.
  • improved beam is understood here to mean that it is possible to increase the amount of light close to the vehicle at high lateral angles, a light that is more useful to the driver than distant light.
  • the lens 3 ' can be determined as follows:
  • the output diopter 3Ems' is calculated so that the light ray u1 'coming out of the lens 3' and coming from an incident ray q1 coming from the point M makes an angle ⁇ (x) with the horizontal plane of the folder 5.
  • the calculation example for the lens 3 ' has the following modifications with respect to the example according to the first variant detailed above: as for the previous example, the point I is a current point which is in a plane perpendicular to the curve 5 passing through any point M 'thereof of lateral coordinate x.
  • the lighting module is such that, for any plane perpendicular to the edge of the folder 5 at a point M, the intersection of the lens 3 with said plane is the section of a stigmatic lens between point M and infinity, the direction of emergent rays making an angle ⁇ with the plane of the folder, continuous function angle of the lateral coordinate (x) of said point M.
  • the function ⁇ (x) is constant or increasing as a function of the lateral coordinate (x) of the point M.
  • the function ⁇ (x) is constant and zero between the lateral coordinates of the points of the edges of the folder located on either side of a vertical plane containing the optical axis (Y) of the module, with preferably the angle of the normal planes at the edge of the folder passing through these points with said axis (Y) is greater than or equal to 5 °, in particular greater than or equal to 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)
EP09179737.3A 2008-12-19 2009-12-17 Verbesserter Beleuchtungsmodul für Kraftfahrzeuge Not-in-force EP2199662B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0807296A FR2940404B1 (fr) 2008-12-19 2008-12-19 Module d'eclairage perfectionne pour vehicule automobile.

Publications (2)

Publication Number Publication Date
EP2199662A1 true EP2199662A1 (de) 2010-06-23
EP2199662B1 EP2199662B1 (de) 2016-04-13

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EP09179737.3A Not-in-force EP2199662B1 (de) 2008-12-19 2009-12-17 Verbesserter Beleuchtungsmodul für Kraftfahrzeuge

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EP (1) EP2199662B1 (de)
FR (1) FR2940404B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2420728A1 (de) * 2010-08-20 2012-02-22 Automotive Lighting Reutlingen GmbH Projektionsscheinwerfer mit gezielt abgeschwächtem Lichtintensitätsgradienten an der Hell-Dunkel-Grenze
FR2979969A1 (fr) * 2011-09-13 2013-03-15 Valeo Vision Module de projecteur lumineux de vehicule automobile pour eclairage de route
EP2674665A3 (de) * 2012-06-13 2016-06-08 Koito Manufacturing Co., Ltd. Lampeneinheit und Projektorlinse für eine KFZ-Leuchte

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2979594B1 (fr) 2011-09-05 2013-09-13 Valeo Vision Projecteur pour vehicule automobile

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1610057A1 (de) * 2004-06-24 2005-12-28 Valeo Vision Beleuchtungseinheit für Kfz-Scheinwerfer und Scheinwefer mit einer derartigen Einheit
FR2898662A1 (fr) * 2006-03-17 2007-09-21 Valeo Vision Sa Procede de construction d'un module de projecteur lumineux pour vehicule automobile, module et projecteur
EP1884708A1 (de) 2006-07-31 2008-02-06 Koito Manufacturing Co., Ltd. Fahrzeugscheinwerfer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1610057A1 (de) * 2004-06-24 2005-12-28 Valeo Vision Beleuchtungseinheit für Kfz-Scheinwerfer und Scheinwefer mit einer derartigen Einheit
FR2898662A1 (fr) * 2006-03-17 2007-09-21 Valeo Vision Sa Procede de construction d'un module de projecteur lumineux pour vehicule automobile, module et projecteur
EP1884708A1 (de) 2006-07-31 2008-02-06 Koito Manufacturing Co., Ltd. Fahrzeugscheinwerfer

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2420728A1 (de) * 2010-08-20 2012-02-22 Automotive Lighting Reutlingen GmbH Projektionsscheinwerfer mit gezielt abgeschwächtem Lichtintensitätsgradienten an der Hell-Dunkel-Grenze
FR2979969A1 (fr) * 2011-09-13 2013-03-15 Valeo Vision Module de projecteur lumineux de vehicule automobile pour eclairage de route
WO2013037858A1 (fr) * 2011-09-13 2013-03-21 Valeo Vision Module de projecteur lumineux de vehicule automobile pour eclairage de route
EP2674665A3 (de) * 2012-06-13 2016-06-08 Koito Manufacturing Co., Ltd. Lampeneinheit und Projektorlinse für eine KFZ-Leuchte
US9546767B2 (en) 2012-06-13 2017-01-17 Koito Manufacturing Co., Ltd. Lamp unit and projector lens

Also Published As

Publication number Publication date
FR2940404B1 (fr) 2011-03-11
FR2940404A1 (fr) 2010-06-25
EP2199662B1 (de) 2016-04-13

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