EP1835325A2 - Infrarot-Beleuchtungsmodul für Kraftfahrzeugscheinwerfer und Scheinwerfer, der mit einem solchen Modul ausgestattet ist - Google Patents

Infrarot-Beleuchtungsmodul für Kraftfahrzeugscheinwerfer und Scheinwerfer, der mit einem solchen Modul ausgestattet ist Download PDF

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Publication number
EP1835325A2
EP1835325A2 EP07290317A EP07290317A EP1835325A2 EP 1835325 A2 EP1835325 A2 EP 1835325A2 EP 07290317 A EP07290317 A EP 07290317A EP 07290317 A EP07290317 A EP 07290317A EP 1835325 A2 EP1835325 A2 EP 1835325A2
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EP
European Patent Office
Prior art keywords
light
diode
radiation
module according
visible
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Withdrawn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
EP07290317A
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English (en)
French (fr)
Inventor
Pierre Albou
Guillaume Tronquet
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 EP1835325A2 publication Critical patent/EP1835325A2/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Withdrawn legal-status Critical Current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
    • F21S41/12—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of emitted light
    • F21S41/13—Ultraviolet light; Infrared light
    • 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 multifunction light projector module for a motor vehicle, wherein one of the functions corresponds to the emission of an infrared light beam used in particular to illuminate a night road scene.
  • This infrared lighting is associated with an infrared camera to perform a night lighting function (or Night Vision, in English terms).
  • the invention has applications in the field of the automobile and, in particular, in the field of night lighting for a motor vehicle.
  • low position lights low intensity and range
  • low beam higher intensity and range on the road is about 70 meters high and the long-range high beam (around 200 meters).
  • the low beam is used at night, in town or on the road when the vehicle crosses another vehicle.
  • High beams are used on a road or highway when there are no other vehicles whose driver might be dazzled.
  • a dual-mode projector that can combine the functions of low beam and high beam.
  • Such a two-mode projector is equipped with a single light source and a cover.
  • This cover is generally a removable metal plate capable of passing from a first position in which it does not obscure the light beam produced by the light source to a second position in which it partially obscures this light beam.
  • the headlamp is in the "dipped beam”function; when the cover is in its first position, the headlamp is in the "high beam” function.
  • DBL Dynamic Bending Light
  • AFS Adaptive Front Lighting System
  • townlight in English, concerns city lighting. This function ensures a broadening of the light beam and a slight decrease in the range of each dipped beam, to spread the light beam produced at the front of the vehicle, to promote the illumination of side roads and sidewalks.
  • a function called motorway or "motorway” in English, relates to motorway lighting. This function ensures an increase in the light range of the low beam when the vehicle is on a highway.
  • bad weather also called adverse weather function in English, relates to lighting in bad weather. This function spreads the light beam of each dipped beam and a slight decrease in the light flux sent downwards, so that the driver of the vehicle, or those of oncoming vehicles, is not dazzled by the reflection of the projectors. on wet road.
  • night vision which provides infrared illumination of a night road scene.
  • the illuminated road scene is filmed using an infrared-type camera.
  • the images produced by the camera are processed and displayed so that the driver can view, on a screen or directly on a portion of the windshield (via a head-up vision system designated in English by the term "Head Up Display” or HUD in abbreviation), the road scene located at the front of his vehicle.
  • the night vision functions are obtained by means of an infrared lighting module specific to night vision.
  • an infrared lighting module specific to night vision.
  • the owner of a vehicle must choose between the night vision function and another lighting function.
  • the light source is generally a single source, for example of the halogen type, equipped with a removable filter.
  • This filter is a filter promoting the emission of infrared radiation; in other words, this filter passes only the infrared spectrum of the radiation emitted by the halogen light source. More specifically, when the filter is in a lowered position, the light source emits its visible radiation directly to the output of the projector. The projector then offers traditional street lighting. When the filter is raised, then only the infrared radiation of the light source is transmitted to the output side of the projector.
  • the projector then offers infrared lighting.
  • the driver can select a traditional road lighting.
  • the driver must switch to crossing lighting. In this case, it can select the crossover lighting alone or the night vision function by means of infrared lighting.
  • This infrared illumination is then added to the crossing illumination, without being inconvenient for the driver of the oncoming vehicle since the radiation infrared is not visible for this driver.
  • a bi-function projector has a large footprint, namely the size of an elliptical projector.
  • a conventional light source particularly a halogen-type source
  • life of a conventional light source is relatively short since a single filament light source is used for two functions namely the road function and the infrared function.
  • an elliptical projector does not allow a very wide variation of style; in particular, it does not highlight the fact that it is an infrared illuminator and not a simple halogen road.
  • the invention aims to overcome the disadvantages of the techniques described above by providing a multifunction module, whose light sources are diodes.
  • the module of the invention uses a light source with visible radiation and an infrared light source, each source being made by means of one or more diodes.
  • the use of diodes makes it possible to reduce the bulk of the module. In addition, it allows to play on the style of the projector because of the small size of the diodes and their modularity.
  • the module of the invention also makes it possible to increase the lifetime of the light sources by the fact that each type of lighting (infrared and visible) is generated by a different source.
  • diodes are sources of great intrinsic life (because based on semiconductor materials).
  • the first diode and the second diode comprise a rectangular emitter, and in that the virtual image of the first light source formed by the partial reflection surface has at least one horizontal edge perpendicular to the direction of the optical axis of the focusing means.
  • Both sources emit radiation preferably in different wavelength ranges.
  • the invention can be applied to any type of diode, in particular comprising a rectangular lambertian emitter placed in a plane orthogonal to the optical axis, behind a known primary optic, imposed by the manufacturer of the light emitting diode.
  • the diodes may include a transparent protective dome located above the emitter, itself placed in the air.
  • the diodes can also with a transmitter that is embedded in a clear transparent dome.
  • the invention also relates to a multifunction type light projector equipped with the module described above.
  • the invention also relates to a motor vehicle comprising a light projector equipped with such a module.
  • Figure 1 schematically shows a multifunction module according to the invention.
  • FIG. 2 represents the path of the visible and infrared light rays in the module of the invention.
  • FIGS 3 and 4 show examples of a module according to the invention wherein the dichroic mirror is removable, allowing the realization of two or three lighting functions by this module.
  • the lighting module according to the invention is a multifunction module having two light sources produced by means of diodes.
  • This lighting module is intended to be installed in a light projector to achieve at least two lighting functions from the same module.
  • This module can therefore be installed in a conventional projector, that is to say a projector whose shape is known, replacing a conventional light source such as a halogen source or any other light source generally ensuring the emission of light radiation in conventional projectors and, in particular, in elliptical projectors.
  • the lighting module of the invention can also participate in the production of new projectors, with new shapes and styles, relating to the use of small diodes.
  • FIG. 1 An example of a lighting module according to the invention is shown diagrammatically in FIG. 1.
  • This module comprises two light sources, namely a source emitting visible radiation and another source emitting another type of radiation, preferably infrared radiation. .
  • Each of these two light sources comprises one or more diode (s).
  • diode diode
  • each light source comprises a single diode, it being understood that it may comprise several grouped together with each other.
  • the first light source 1 emits infrared radiation. This light source will be called later infrared diode.
  • the second light source 2 emits visible radiation. It will be called later visible diode.
  • the path visible light R v and infrared radiation R 1 are shown in FIG. 2.
  • the infrared diode and the visible diode each emit radiation, respectively infrared and visible, along an optical axis specific to each diode.
  • the optical axis X1 of the infrared diode 1 and the optical axis X2 of the visible diode 2 are not parallel and form an intersection 4. These two optical axes may be, for example perpendicular, as in the example of FIG. 1.
  • the module comprises a partial reflection surface 3.
  • This partial reflection surface 3 is a surface that has the particularity of reflecting certain radiation and let other radiation pass. As will be seen in more detail later, this partial reflection surface may be a mirror or any other selective reflection element, for example a diffraction grating. This partial reflection surface 3 will be called more simply, thereafter, mirror.
  • the radiation emitted by diodes 1 and 2 comes directly from the diodes.
  • the radiation emitted by the diodes is free, unfocused radiation.
  • Light beams resulting from these radiations will be formed downstream of the mirror 3 by means of a focusing means 5 such as a diffraction lens.
  • This focusing means 5 hereinafter referred to as the lens, ensures the focusing of the received light rays on its input face 5e.
  • This focusing transforms light radiation into light beams with predefined characteristics. These light beams, infrared or visible, are directed towards the protective glass of the projector. Thus, whether they are visible or infrared, the light beams are formed by the same optics, namely the lens 5.
  • the two diodes 1 and 2 as well as the mirror 3 and the diffraction lens 5 together form a lighting module.
  • This lighting module is independent of other elements of the projector.
  • This lighting module can therefore be installed in an existing projector, instead of a conventional light source, or in a new projector, created around this module.
  • the radiation of the diodes 1 and 2 must be transmitted to the lens 5 to be focused.
  • the mirror 3 is placed at the intersection of the optical axes X1 and X2.
  • the visible diode 2 is placed horizontally facing the lens 5. Its optical axis X2 is therefore coincident with the optical axis of the lens.
  • the infrared diode 1 is placed vertically. Its optical axis X1 is perpendicular to the optical axis of the lens 5.
  • the mirror 3 is then installed so as to form an equal angle between the optical axis of the visible diode 2 and the optical axis of the infrared diode 1 In this preferred embodiment, the mirror 3 is placed at an angle of approximately 45 ° to each of the optical axes X1 and X2.
  • the infrared diode may be placed indifferently all around the optical axis of the lens 5. In the preferred embodiment of the invention, it has been chosen to place it below the optical axis, perpendicular to said optical axis, for manufacturing reasons and for thermal reasons (in order to best evacuate the amount of heat produced by these sources).
  • the light body of the diode is rectangular, it is desirable, for the constitution of an infrared beam of suitable shape by the lens 5, that the virtual image formed by the mirror has at least one horizontal edge (of preferably the edge of larger dimension), perpendicular to the direction of the optical axis of 5, which for a given position of the center of the diode requires to provide a proper orientation.
  • the mirror 3 reflects part of the received radiation. More precisely, it reflects one of the luminous radiations and allows the other luminous radiation to pass.
  • the mirror 3 may be a two-sided dichroic mirror, each face of which faces one of the two diodes.
  • the dichroic mirror in a preferred embodiment of the invention, has a flat surface for each of its faces. Its input face 3e, which faces the visible diode 2, ensures the passage of visible radiation.
  • the Dichroic mirror transmits the wavelengths corresponding to the visible light and reflects the wavelengths corresponding to the infrared light.
  • the visible light is therefore transmitted directly to the lens 5 while the infrared light is transmitted by reflection towards the lens 5.
  • the reflection of the infrared radiation on the exit face 3s of the mirror 3 creates a virtual light source of the infrared diode 1.
  • This virtual source of the infrared diode is placed on the optical axis of the lens 5, this optical axis corresponding to the optical axis X2 of the visible diode 2.
  • the infrared radiation at the output of the mirror 3 are therefore on the same axis as visible radiation.
  • the infrared virtual source is superimposed on the actual visible source.
  • a virtual image of a light source is created by a plane, this virtual image being placed at a predefined location.
  • the infrared light beam obtained at the output of the lens 5 is similar to the visible light beam produced by the visible source. It is therefore possible, at the output of the lens 5, an infrared light beam or a visible light beam, both having the same spatial distribution.
  • the lighting module of the invention is associated with a means for supplying and controlling the light sources, not shown in the figures. Visible diodes 2 and infrared 1 are therefore controlled from this supply means which provides power to a single diode at a time or, in some embodiments, both diodes simultaneously.
  • the visible diodes 2 and infrared 1 are fed alternately.
  • the lighting module emits either infrared lighting, when the user has switched the power supply means on the night vision function, or visible lighting, when the user switches the supply means on the visible function .
  • the light beam emitted by the lighting module is similar geographically, that is to say that it is emitted in the same direction, with the same spatial characteristics.
  • the distances between each of the diodes 1 and 2 and the mirror 3 are almost identical, which makes it possible to obtain, at the exit of the lens 5, a similar beam for the infrared and for the visible. It is Nevertheless, it is possible to place the infrared diode and the visible diode at slightly different distances, so that the virtual image of the infrared diode or the visible diode are, one or the other, away from the focus of the lens. It is thus possible to obtain a more or less narrow beam for one of the functions (the narrowest beam being that corresponding to the source (real or virtual) closest to the focus of the lens 5.
  • the mirror 3 is a dichroic mirror with two flat faces, whose output face 3s is the reflecting face, covered with a treatment layer.
  • This embodiment has the following advantage: the infrared emitted by the source 1 having a narrow spectrum, the treatment necessary to reflect the radiation of the infrared spectrum of the source 1 requires a smaller number of layers than the treatment necessary to reflect the visible spectrum from the source 2. This reflection of infrared radiation can be further improved by using as infrared source a monochromatic diode.
  • the input face 3e can also be processed. It is then covered with an antireflection layer so as to avoid any reflection of the visible radiation so that a maximum of this radiation passes through the mirror 3.
  • the infrared diode 1 is placed on the optical axis of the lens 5 and the visible diode 2 is placed perpendicularly to this optical axis.
  • the output face 3s of the dichroic mirror 3 has a larger number of processing layers, because of the wider spectrum of the source 2. Indeed, since each treatment layer reflects a single wavelength, it is necessary to superimpose several treatment layers to reflect the different wavelengths of visible light.
  • a white light diode it is possible to choose, as a visible source, a white light diode. Indeed, the light emitted by such a diode is obtained from blue and yellow-green radiation. The white of this light is obtained by additive synthesis of these two colors in the diode. The reflection of the white light, by a dichroic mirror, is thus easier to obtain than that of the visible light since it only requires the covering by a layer reflecting the blue spectra and a layer reflecting the yellow-green spectra. In addition, since the white light of a white diode contains virtually no red radiation and since the infrared diode does not contain white light, then the realization of the dichroic mirror is relatively simple, i.e. it requires few layers if a thin-film interference-type solution is chosen because the selectivity of the reflector need not be large.
  • the partial reflection surface 5 is made by means of a diffraction grating whose angular response depends on the wavelength. In this case, it is possible to choose two collimated beams associated with a prism.
  • the infrared function for night vision with the road function is associated in the same lighting module, the infrared function for night vision with the road function.
  • the infrared function can be combined in the lighting module with the DRL daylight function or with the fog lamp function. In this case, infrared light and visible light can be emitted simultaneously.
  • the light beam obtained at the exit of the lens 5 must be more spread out, that is to say more diffuse than a driving beam, so as to emit a light beam at a distance less long but wider than road lighting.
  • the input face 3rd mirror 3 that is to say the mirror face located on the side of the visible diode.
  • This input face 3e of the mirror 3 is then no longer flat but on the contrary convex, which ensures a defocusing of the visible radiation to send further behind. In this way, the visible light beam, obtained at the output of the lens, is more spread out.
  • the input face 3e of the mirror 3 can be modified in a relatively complex manner in order to allow spreading of visible radiation without suppressing the cutoff.
  • the mirror 3 and the position of the sources 1 and 2 must be such that the virtual image of the reflected source is superimposed at least partially to that of the non-reflected source, without notable deformation.
  • the non-imaging lenses such as the lens 5 used in the module of the invention, are calculated for planar and rectangular sources, perpendicular to the optical axis.
  • the visible source can be used as part of a code beam (for a conventional code function, a motorway function or "motorway" in English, or a bad weather function, also called adverse weather function in English ,) if the lens 5 was designed for this.
  • the infrared beam which must be either centered vertically or complementary to the visible beam with a covering, is produced by the code-type lenses with a shift of the images.
  • an axial shift as discussed above allows to play on the focus and sharpness of the images projected by the lens (and to remove a possible cut) and a vertical offset allows to place the beams.
  • the lens 5 is optimized to create a good road beam from a rectangular source.
  • the lens 5 is optimized to create a motorway beam (motorway or "motorway") from a rectangular source (intense beam that is to say, focused and thin, cut), the beam obtained from the virtual infrared source then being a concentrated band, without cut, passing above the horizontal and corresponding to the night vision function.
  • motorway motorway or "motorway”
  • the beam obtained from the virtual infrared source then being a concentrated band, without cut, passing above the horizontal and corresponding to the night vision function.
  • This movable mirror or removable mirror, can be placed in a function position and in a neutral position.
  • the mirror In its position of function, the mirror is at an angle of 45 ° of the optical axes X1 and X2 of the two sources 1 and 2. In this position, the infrared radiation is usable.
  • the mirror In its neutral position, the mirror is placed horizontally or offset in any other way. In this position, the lighting module is in visible road function.
  • a removable mirror it is possible to make a tri-function module with DRL functions, road lighting, and infrared lighting. In this case, we choose a mirror with a domed entry face to achieve DRL lighting.
  • the lighting obtained is DRL lighting with infrared lighting.
  • the infrared source is off.
  • the lighting obtained is then a road lighting.
  • the use of a removable mirror allows to offer three functions with a single lighting module. It also makes it possible to avoid the losses due to the mirror (absorption, reflection and transmission of the visible light emitted by the white diode) in order to obtain a high performance visible road function at the photometric level.
  • a mechanical system ensures a movement of the mirror, either in translation or in rotation with respect to an axis of rotation ⁇ .
  • FIGS. 3 and 4 An example of a removable mirror, according to a rotation, is shown in FIGS. 3 and 4. More precisely, FIG. 3 shows the mirror in the operating position and FIG. 4 shows the same mirror in the neutral position. These figures show the diodes 1 and 2 as well as the mirror 3 actuated by actuating means 6.
  • the mobility of the mirror is obtained by rotation around the axis ⁇ .
  • a displacement along an axis of rotation parallel to the edge A may be associated with it.
  • Such a displacement is particularly interesting because it allows to completely clear the mirror without risk of interference with the optical elements.
  • the crimping angle to change from the neutral position to the function position may be less than or equal to 45 °. This folding angle can be small, since it is sufficient for the mirror 3 not to interfere with the light beam coming from the visible diode 2 and passing through the lens 5.
  • the actuating means 6 may be, for example, an actuator associated with a gear 7.
  • This actuator may be a DC motor or a rotary or linear electromagnet.
  • These actuating means may comprise a safety device providing the mirror a safety position in case of failure.
  • This safety device may be a return means such as a torsion spring 8 placed on the axis of rotation ⁇ .
  • the actuator is continuously powered to maintain the mirror 3 in the neutral position.
  • the infrared route function infrared diode energized and white diode not energized
  • the mirror is returned to the function position.
  • the actuating means may consist of a bistable system in which the actuator passes a hard point to the mirror, to switch from the neutral position to the function position, each of these positions being a stable position.
  • a detection system by switch or other sensor, can be added to the actuating means to provide information on the position of the mirror so that, in case of failure, the assembly, or at least the visible source, can be de-energized .

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
EP07290317A 2006-03-17 2007-03-13 Infrarot-Beleuchtungsmodul für Kraftfahrzeugscheinwerfer und Scheinwerfer, der mit einem solchen Modul ausgestattet ist Withdrawn EP1835325A2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0602396A FR2898661B1 (fr) 2006-03-17 2006-03-17 Module d'eclairage de projecteur a emission infrarouge pour vehicule automobile et projecteur equipe d'un tel module

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EP1835325A2 true EP1835325A2 (de) 2007-09-19

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EP07290317A Withdrawn EP1835325A2 (de) 2006-03-17 2007-03-13 Infrarot-Beleuchtungsmodul für Kraftfahrzeugscheinwerfer und Scheinwerfer, der mit einem solchen Modul ausgestattet ist

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EP (1) EP1835325A2 (de)
FR (1) FR2898661B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102313229A (zh) * 2011-07-21 2012-01-11 江苏洪昌科技股份有限公司 基于led为光源的汽车前照灯的近光光学***
EP2832646A1 (de) * 2013-07-30 2015-02-04 Goodrich Lighting Systems GmbH Flugzeugaußenbeleuchtungseinheit und Verfahren zum Betreiben einer Flugzeugaußenbeleuchtungseinheit
CN105650571A (zh) * 2016-04-05 2016-06-08 哈尔滨固泰电子有限责任公司 使用dmd的带有红外功能汽车前照灯装置及照明方法
CZ308275B6 (cs) * 2019-01-30 2020-04-08 Varroc Lighting Systems, s.r.o. Světelné zařízení pro vozidlo

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10129743C2 (de) * 2001-06-20 2003-05-08 Daimler Chrysler Ag Fahrzeugscheinwerfer, mit einer Anzahl von elektronischen Leuchtelementen als Lichtquelle
US6900437B2 (en) * 2002-06-12 2005-05-31 Ford Global Technologies, Llc Color corrected laser illumination system for night vision applications

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102313229A (zh) * 2011-07-21 2012-01-11 江苏洪昌科技股份有限公司 基于led为光源的汽车前照灯的近光光学***
EP2832646A1 (de) * 2013-07-30 2015-02-04 Goodrich Lighting Systems GmbH Flugzeugaußenbeleuchtungseinheit und Verfahren zum Betreiben einer Flugzeugaußenbeleuchtungseinheit
US9758259B2 (en) 2013-07-30 2017-09-12 Goodrich Lighting Systems Gmbh Exterior aircraft light unit and method of operating an exterior aircraft light unit
CN105650571A (zh) * 2016-04-05 2016-06-08 哈尔滨固泰电子有限责任公司 使用dmd的带有红外功能汽车前照灯装置及照明方法
CZ308275B6 (cs) * 2019-01-30 2020-04-08 Varroc Lighting Systems, s.r.o. Světelné zařízení pro vozidlo

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Publication number Publication date
FR2898661B1 (fr) 2009-10-23
FR2898661A1 (fr) 2007-09-21

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