EP1564481A1 - Beleuchtungsmodul für Kfz-Scheinwerfer, Reflektor für ein solches Modul, und Kfz-Scheinwerfer umfassend dieses Modul - Google Patents

Beleuchtungsmodul für Kfz-Scheinwerfer, Reflektor für ein solches Modul, und Kfz-Scheinwerfer umfassend dieses Modul Download PDF

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Publication number
EP1564481A1
EP1564481A1 EP05290258A EP05290258A EP1564481A1 EP 1564481 A1 EP1564481 A1 EP 1564481A1 EP 05290258 A EP05290258 A EP 05290258A EP 05290258 A EP05290258 A EP 05290258A EP 1564481 A1 EP1564481 A1 EP 1564481A1
Authority
EP
European Patent Office
Prior art keywords
reflector
point
light
light source
source
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Withdrawn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
EP05290258A
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English (en)
French (fr)
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
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 EP1564481A1 publication Critical patent/EP1564481A1/de
Withdrawn legal-status Critical Current

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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
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/147—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—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
    • 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 relates to a light projector module for a vehicle automobile having a light source having a flat surface, immersed in a volume of transparent material having a refraction greater than 1, and a reflector having a focus at a point from the source.
  • the invention relates more particularly, but not exclusively, to a such module whose light source is constituted by a diode electroluminescent, hereinafter referred to by the abbreviation "led", whose surface transmitter is protected by a hemispherical volume, usually in one transparent polymer.
  • led diode electroluminescent
  • the invention aims, above all, to provide a projector module light source which makes it possible to obtain a light beam with cut-off, or presenting maximum illumination offset vertically, with a reduced number of components while maintaining a good light output.
  • a cut-off or pseudo-cut beam for a road function or for a DRL supplement (fire diurnal), especially with LEDs called "luxuryon", Lambertian type.
  • LEDs called "luxuryon", Lambertian type.
  • the luminescent material forming the light source is located in a plane.
  • the module has a footprint as small as possible, in particular lower than that of projectors comprising elliptical reflectors and lenses.
  • a projector module luminous of the kind defined previously is such that the point of the source the focal point of the reflector is chosen in such a way that the radii light emitted by this point are deflected by refraction while leaving the volume transparent to pass through the air, and that the reflector is constructed in such a way that these light rays deviated, after reflection on the reflector, become substantially parallel to a predetermined direction.
  • the light projector module of the kind defined previously has a light source immersed in a volume hemispherical transparent material and is such that the point of the source light at the focus of the reflector is moved away from the center of the volume hemispherical, and the reflector comprises / consists of a surface stigmatic between the point of the source and a straight segment ahead or behind the surface of the reflector.
  • the light source is immersed in a hemispherical volume of transparent material and the module is such that the point of the light source at the focus of the reflector is removed from the center of the hemispherical volume, the reflector being constructed in such a way that substituting at the point of the light source a frosted point of the plane base of the hemispherical volume and by illuminating this point frosted by a laser beam, one obtains with the optical system constituted by / including the volume hemispheric and the reflector a beam to infinity constituted by a segment horizontal, or by a point.
  • the light source is a led (English abbreviation to designate a light-emitting diode) immersed in a volume hemispherical transparent material having a flat base turned to the side opposite to the reflector.
  • the focus of the reflector may be located at a point near an edge of the light source so that a light beam cut is obtained.
  • a point near the upper edge (or front) of the source bright, we get a cut-off beam above a horizontal line, especially for a road or DRL function (that is to say, the light is found above the cut in these cases).
  • a cut-off beam below a horizontal line that is, in In this case, the light is under the cut, as in the case of a fire. intersection).
  • the wavelength of the light rays after reflection on the reflector is advantageously a cylindrical surface admitting an axis on which they rely on reflected light rays.
  • the invention also relates to a reflector for such a module characterized in that its surface is such that light rays from a point located at the focus, and refracted out of a volume of transparent material surrounding the focus, become reflective parallel to a direction predetermined.
  • the invention also relates to a vehicle light projector car having at least one module as defined above.
  • the projector may have several modules that individually bundles of different characteristics to produce a global beam satisfactory.
  • Fig.1 is a diagram intended to facilitate the understanding of the description which follows.
  • a reflector 1 constituted by a paraboloid, admits a focus 2 located on the optical axis 3.
  • a plane light source 4 is disposed in a plane orthogonal to the axis 3 and passing through the focus 2.
  • the edge Source 4 is located at focus 2.
  • Light rays such as 5a emitted by the lower edge of source 4 come from the focus and are reflected in 5b parallel to the optical axis.
  • rays such as 6a from the upper edge 7 of the source 4 are reflected at 6b according to a direction inclined downward from the horizontal. It is the same for all points of source 4 located above fireplace 2.
  • the light beam thus obtained has a cutoff line horizontal and the area lit by reflected rays such as 6b is below of this cutoff line.
  • the surface of the dish 1 is optically characterized by the fact that it transforms a spherical wave surface into a plane wave surface.
  • the source 4 of FIG. 1 is a theoretical light source emitting directly in the air that bathes the entire reflector 1 and the source.
  • FIG. 2 illustrates a concrete embodiment of a plane light source consisting of a high luminance led 8 which consists of a thin flat layer of luminescent material 9, constituting the light source proper and of a volume 10 of transparent material covering and protecting layer 9.
  • volume 10 is hemispherical centered on the center O of the emitting layer 9, which may be square or rectangular.
  • the base of the volume 10 is flat, constituted by a large circle and the layer 9 is immersed in the volume 10 at its flat base.
  • the index of refraction of the material of volume 10 is greater than 1, that is, greater than the refractive index of the air in which all the elements are immersed.
  • the focus of a reflector 12 whose surface is different from that of a dish, is located on a point 11 of the source separated from the center O.
  • This point 11 can be located on the lower edge of layer 9 which, according to the representation of Fig.2, lies in a vertical plane.
  • a light ray such 13i emitted by point 11 meets the hemispherical surface of volume 10 at an angle of incidence that is not zero and the radius 13i out of the volume 10 in the air by being deflected by refraction to give the radius 13r.
  • Another radius 14i, 14r from point 11 has been shown.
  • the focus of the reflector is located in the center O of the surface 9
  • the light rays from this point O are orthogonal to the surface hemispherical volume (zero angle of incidence) and exit without being deflected. But such an arrangement does not make it possible to obtain a light beam with cut.
  • the reflector 12 is constructed in such a way that the refracted rays 13r, 14r become rays 13e, 14e parallel to a determined direction ⁇ after reflection on the reflector 12.
  • the direction ⁇ corresponds to the optical axis.
  • the surface of the reflector 12 is thus constructed to transform the source 11, immersed in the transparent hemispherical volume, in one a cylindrical wave surface source admitting as the axis of the wave surface a line A (FIG. 2) orthogonal to the optical axis ⁇ .
  • the line A is located at a distance D from the center O of the source. This distance D is a characteristic of the optical system, as is the angle ⁇ between the optical axis ⁇ and the horizontal direction OZ.
  • the point where the focus of the reflector is located can be defined by three coordinates xf, yf, zf in an orthonormal coordinate system whose two axes are OY, OZ according to Fig.2.
  • the third axis OX not shown passes the point O and is perpendicular to the plane OYZ.
  • the family of reflector surfaces such as 12 is thus characterized optically, and mathematically.
  • the vector normal to the plane source 9 can be tilted on the horizontal.
  • refracted rays such as 15r, 16r from point 11 and located in a plane different from that of Fig.2, are reflected on radii 15e, 16e which cut at a right angle the axis A of the cylindrical wave surface.
  • the surface of the reflector 12 is stigmatic between the immersed point 11 in a transparent sphere portion having a refractive index greater than 1, not centered on this point 11, and a segment of line A located in front of the surface 12 according to the direction of propagation of the light.
  • the line A could be behind the surface of the reflector 12 in which case the segment would be virtual; the section of the reflector 12 an orthogonal plane to the line A would be more "open” than in the case previous, without going to a hyperbole (it would be a hyperbole that in the absence of the sphere portion 10.).
  • the source 9 is arranged (see FIG. so that the focus of the reflector is located on the upper edge 17 of the source or near this edge.
  • FIG. 4 which corresponds to a vertical section of a module for a route function, the plane of the source 9 is switched to forward with respect to the vertical direction. It's the same for the reflector 12.
  • a ray 18r from point 17 is reflected along a radius 18e parallel to the horizontal optical axis.
  • a ray such as 19r from a point of the source 9 located lower than the point 17 is reflected according to a 19th ray directed up and illuminating above the 18th ray. The cut is thus carried out at the bottom of the beam.
  • Fig.5. shows in perspective the projector module of Fig.4 with the reflector 12 whose upper part is inclined towards the front.
  • Fig.6 is an example of a network of isolux curves (i.e. constant illumination) obtained with a road searchlight according to FIG. remote screen determined, here 25 meters, the projector, orthogonal to the axis optical.
  • the curves correspond to less and less illuminations strong from the center to the outside.
  • the line H corresponds to the intersection of the screen with the horizontal plane passing through the optical axis
  • the line V corresponds to the intersection of the screen with the vertical plane passing through the optical axis.
  • the right and left limits ⁇ 40% correspond to intersections with the screen of light rays from the source and forming with the optical axis, in the horizontal plane, an angle whose tangent is ⁇ 0.4.
  • Fig.6 it appears that the beam "road” is essentially located above the H line and is virtually equally distributed of the line V.
  • the isolux corresponding to the maximum illumination is located within the network and is substantially tangent to line H, but being located above this line.
  • the focus of the reflector 12 To shift the maximum illumination downwards, simply move the focus of the reflector 12 at a point of the source 9 located lower than the edge 17. If the focus of the reflector 12 is located in the center of the source, the Isolux network has a maximum centered on the point of intersection of lines H and V. In addition, the surface 12 becomes that of a paraboloid of revolution and the output beam is a parallel beam, the distance D becoming infinite.
  • Fig.7 shows the isolux curves of a "wide" code beam with cut above the line H, obtained when the focus of the reflector 12 is located on the lower edge of the source 9.
  • the distance D is relatively low, which spreads the beam horizontally.
  • Fig.8 shows the isolux of a less focused beam focused code horizontally as the beam of Fig.7, but still located essentially below the horizontal line H.
  • the image of a point of the source is virtually infinite.
  • the beams of Figs. 7 and 8 may also be suitable for fires fog with horizontal cut.
  • a code projector must give a beam with a cut horizontally on one side of the vertical line V and a cut along a line tilted from the point of intersection of lines V and H and rising to the side where traffic (right for most European countries).
  • the angle tilt is 15 °.
  • a complete code, road or fog function will thus require several modules, each module comprising an LED. It is possible and desirable to vary the parameters such as D between the different modules for the same function.
  • the properties of a reflector 12 according to the invention can be verified as follows. From the knowledge of the led used, we can recover the corresponding hemispheric volume of this led or the rebuild in a transparent material having the same refractive index.
  • the lower face, or flat base of the hemispherical volume is depolished a point corresponding to an apex of the transmitting source, or the focus of reflector if it is shifted.
  • This hemispherical volume is then installed in the optical system with the frosted dot in the focus, the base of the hemispherical volume being correctly oriented.
  • the search parameters including D and yf can be done by identification from a small number of points palpated on the surface of the based.
  • the light projector module according to the invention is particularly simple since it consists essentially of a reflector and a led. he allows to obtain a cut-off beam, without loss of light related to the presence of a cache. Compared to a simple paraboloid centered or defocused, a minimization of the maximum / low (or high) distance of the beam is obtained.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
EP05290258A 2004-02-13 2005-02-04 Beleuchtungsmodul für Kfz-Scheinwerfer, Reflektor für ein solches Modul, und Kfz-Scheinwerfer umfassend dieses Modul Withdrawn EP1564481A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0401489 2004-02-13
FR0401489A FR2866412B1 (fr) 2004-02-13 2004-02-13 Module de projecteur lumineux pour vehicule automobile, reflecteur pour un tel module, et projecteur equipe de de module

Publications (1)

Publication Number Publication Date
EP1564481A1 true EP1564481A1 (de) 2005-08-17

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EP05290258A Withdrawn EP1564481A1 (de) 2004-02-13 2005-02-04 Beleuchtungsmodul für Kfz-Scheinwerfer, Reflektor für ein solches Modul, und Kfz-Scheinwerfer umfassend dieses Modul

Country Status (4)

Country Link
US (1) US8186854B2 (de)
EP (1) EP1564481A1 (de)
JP (1) JP4652076B2 (de)
FR (1) FR2866412B1 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1748251A1 (de) * 2005-07-26 2007-01-31 Valeo Vision Beleuchtungsvorrichtung für Kraftfahrzeuge
EP1870633A1 (de) * 2006-06-23 2007-12-26 Valeo Vision Scheinwerfermodul mit Elektrolumineszenzdiode
EP1970619A1 (de) * 2007-03-14 2008-09-17 Valeo Vision Optisches Modul für Kraftfahrzeugscheinwerfer
EP2101105A1 (de) * 2008-03-11 2009-09-16 Valeo Vision Beleuchtungsvorrichtung für Kraftfahrzeug
WO2011098430A1 (fr) * 2010-02-15 2011-08-18 Valeo Vision Dispositif optique d'un vehicule automobile comprenant une source surfacique de lumiere
FR2960497A1 (fr) * 2010-05-31 2011-12-02 Valeo Vision Module d'eclairage pour projecteur de vehicule automobile
DE102013107347A1 (de) 2013-07-11 2015-01-15 AHC-Oberflächentechnik GmbH Konstruktionselement
EP3124855A1 (de) * 2015-07-28 2017-02-01 Valeo Vision Beleuchtungsvorrichtung für kraftfahrzeugscheinwerfer

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4497074B2 (ja) * 2005-10-05 2010-07-07 市光工業株式会社 車両用灯具
KR101340902B1 (ko) * 2005-12-12 2013-12-13 코닌클리케 필립스 엔.브이. Ｌｅｄ 콜리메이터 및 조명 유닛
JP2010192411A (ja) * 2009-02-20 2010-09-02 Koito Mfg Co Ltd 車輌用前照灯
DE102012211144B3 (de) * 2012-04-20 2013-09-19 Automotive Lighting Reutlingen Gmbh Lichtmodul

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EP0364806A2 (de) * 1988-10-21 1990-04-25 TEMIC TELEFUNKEN microelectronic GmbH Flächenhafter Strahler
EP1077344A2 (de) * 1999-08-16 2001-02-21 FER Fahrzeugelektrik GmbH Leuchte
WO2001073860A2 (en) * 2000-03-24 2001-10-04 Ledcorp Illumination apparatus and light emitting diode and method of use
JP2003031007A (ja) * 2001-07-16 2003-01-31 Stanley Electric Co Ltd 灯 具
JP2003141910A (ja) * 2001-11-02 2003-05-16 Stanley Electric Co Ltd 車両用灯具
FR2841966A1 (fr) * 2002-07-04 2004-01-09 Koito Mfg Co Ltd Lampe de vehicule a reflecteur de faible profondeur

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US3037139A (en) * 1958-12-05 1962-05-29 Fuller Myers Double image electric light projectors
US5803579A (en) * 1996-06-13 1998-09-08 Gentex Corporation Illuminator assembly incorporating light emitting diodes
JP3753011B2 (ja) * 2001-04-11 2006-03-08 豊田合成株式会社 反射型発光ダイオード
JP4665205B2 (ja) * 2001-07-16 2011-04-06 スタンレー電気株式会社 灯具用線状光源
JP4068387B2 (ja) * 2002-04-23 2008-03-26 株式会社小糸製作所 光源ユニット
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0364806A2 (de) * 1988-10-21 1990-04-25 TEMIC TELEFUNKEN microelectronic GmbH Flächenhafter Strahler
EP1077344A2 (de) * 1999-08-16 2001-02-21 FER Fahrzeugelektrik GmbH Leuchte
WO2001073860A2 (en) * 2000-03-24 2001-10-04 Ledcorp Illumination apparatus and light emitting diode and method of use
JP2003031007A (ja) * 2001-07-16 2003-01-31 Stanley Electric Co Ltd 灯 具
JP2003141910A (ja) * 2001-11-02 2003-05-16 Stanley Electric Co Ltd 車両用灯具
FR2841966A1 (fr) * 2002-07-04 2004-01-09 Koito Mfg Co Ltd Lampe de vehicule a reflecteur de faible profondeur

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PATENT ABSTRACTS OF JAPAN vol. 2003, no. 09 3 September 2003 (2003-09-03) *

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1748251A1 (de) * 2005-07-26 2007-01-31 Valeo Vision Beleuchtungsvorrichtung für Kraftfahrzeuge
FR2889288A1 (fr) * 2005-07-26 2007-02-02 Valeo Vision Sa Dispositif d'eclairage avec plusieurs modules optiques pour vehicule automobile
EP2762772A1 (de) 2005-07-26 2014-08-06 Valeo Vision Beleuchtungsvorrichtung für Kraftfahrzeuge
EP1870633A1 (de) * 2006-06-23 2007-12-26 Valeo Vision Scheinwerfermodul mit Elektrolumineszenzdiode
FR2902861A1 (fr) * 2006-06-23 2007-12-28 Valeo Vision Sa Module de projecteur avec diode electroluminescente
EP1970619A1 (de) * 2007-03-14 2008-09-17 Valeo Vision Optisches Modul für Kraftfahrzeugscheinwerfer
FR2913750A1 (fr) * 2007-03-14 2008-09-19 Valeo Vision Sa Module optique pour projecteur de vehicule automobile
EP2101105A1 (de) * 2008-03-11 2009-09-16 Valeo Vision Beleuchtungsvorrichtung für Kraftfahrzeug
FR2928717A1 (fr) * 2008-03-11 2009-09-18 Valeo Vision Sa Dispositif d'eclairage pour vehicule automobile.
WO2011098430A1 (fr) * 2010-02-15 2011-08-18 Valeo Vision Dispositif optique d'un vehicule automobile comprenant une source surfacique de lumiere
FR2956468A1 (fr) * 2010-02-15 2011-08-19 Valeo Vision Dispositif optique, notamment pour vehicule automobile
CN102753885A (zh) * 2010-02-15 2012-10-24 法雷奥照明公司 包括表面光源的用于机动车辆的光学装置
CN102753885B (zh) * 2010-02-15 2015-12-02 法雷奥照明公司 包括表面光源的用于机动车辆的光学装置
US8960979B2 (en) 2010-02-15 2015-02-24 Valeo Vision Optical device for a motor vehicle including a surface light source
FR2960497A1 (fr) * 2010-05-31 2011-12-02 Valeo Vision Module d'eclairage pour projecteur de vehicule automobile
EP2390562A3 (de) * 2010-05-31 2014-12-03 Valeo Vision Beleuchtungsmodul für Kraftfahrzeugscheinwerfer
US8651716B2 (en) 2010-05-31 2014-02-18 Valeo Vision Lighting module for headlamp of a motor vehicle
DE102013107347A1 (de) 2013-07-11 2015-01-15 AHC-Oberflächentechnik GmbH Konstruktionselement
EP3124855A1 (de) * 2015-07-28 2017-02-01 Valeo Vision Beleuchtungsvorrichtung für kraftfahrzeugscheinwerfer
FR3039629A1 (fr) * 2015-07-28 2017-02-03 Valeo Vision Dispositif d'eclairage pour projecteur de vehicule automobile
US10920947B2 (en) 2015-07-28 2021-02-16 Valeo Vision Lighting device for a motor vehicle headlight

Also Published As

Publication number Publication date
US8186854B2 (en) 2012-05-29
JP4652076B2 (ja) 2011-03-16
FR2866412A1 (fr) 2005-08-19
JP2005228746A (ja) 2005-08-25
FR2866412B1 (fr) 2007-01-19
US20050180153A1 (en) 2005-08-18

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