EP2771611A1 - Beleuchtungseinrichtung für ein kraftfahrzeug - Google Patents
Beleuchtungseinrichtung für ein kraftfahrzeugInfo
- Publication number
- EP2771611A1 EP2771611A1 EP12775663.3A EP12775663A EP2771611A1 EP 2771611 A1 EP2771611 A1 EP 2771611A1 EP 12775663 A EP12775663 A EP 12775663A EP 2771611 A1 EP2771611 A1 EP 2771611A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- light
- lighting device
- light source
- less
- lighting
- 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
Links
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]
-
- 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
- F21S41/16—Laser light sources
-
- 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
- F21S41/176—Light sources where the light is generated by photoluminescent material spaced from a primary light generating element
-
- 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
- F21S43/10—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
- F21S43/16—Light sources where the light is generated by photoluminescent material spaced from a primary light generating element
Definitions
- the invention relates to a lighting installation for a motor vehicle
- LED lighting devices for mounting devices, with which suitable light distributions for signal lights or headlights of the vehicle are generated. Since the luminance for LEDs is relatively low, large installation spaces for the lighting device are required, in particular for generating light with a long range. For smaller installation spaces, lighting devices based on LEDs are not efficient. Furthermore, it is difficult to generate high-precision arbitrarily shaped light distribution with LEDs.
- the object of the invention is to provide a lighting device for a motor vehicle, with the high accuracy and efficient light distributions can be generated on small spaces.
- the invention BeteteucWungs liked is intended for a motor vehicle, in particular for a car and possibly, even for a truck.
- the device comprises one or more illumination units, wherein a respective illumination unit is configured such that it generates a punctiform light source during operation by means of laser light.
- a point light source is a light source having a small light emitting area and a large luminous flux, i. high luminance, which in terms of the dimensions of the illumination device can be assumed as a point-like approximation in such a way that all the rays of the light source emanate from a single point.
- the illumination device furthermore comprises an optical device, which is designed and arranged with respect to the illumination unit or illumination units such that a predetermined light distribution is generated from the light of the point light source after passing through the optical device.
- the optical device can be constructed from a plurality of subunits, which are each assigned separately to a humidifying unit. There is also the possibility that the optical device constitutes a continuous unit on which the light falls alier lighting units.
- Laser light can be generated in a simple manner, a punctiform light source with a very high luminance, so that the corresponding dimensions of the Beieuchtungsein- direction, in particular the optical device for generating the predetermined light distribution, can be made compact.
- the maximum extent of the punctiform light source in plan view, ie seen in Hauptstrahlriohtung with the highest intensity of the light source is in a particularly preferred Ausfschreibungsform 500 pm or less, preferably 100 pm or less, and more preferably 20 pm or less.
- the punctiform light source in plan view preferably has an emitting area of 0.5 mm 2 or less, particularly 0.01 mm 2 or less, and more preferably 0.0002 mm 2 or less.
- the point light source includes fully in particular a square emitting Escape "the cards have a length of 500 pm or less and preferably of 20 pm or less.
- the punctiform light source with the dimensions just described is preferably designed such that it generates a luminous flux of 100 lm or more and in particular of 200 lm or more and / or a beam power of 1 watt or more and / or a luminance of at least 10 8 Cd / m 2 and in particular of 10 "Cd / m 2 or more
- Such punctiform light sources can be achieved only with laser light, for example using laser diodes.
- the shape of the optical device for generating a specific light distribution can be determined algorithmically particularly simply because it can be assumed in the corresponding calculations of an ideal punctiform light source.
- the so-called ITWM algorithm developed by the Fraunhofer Institute for Industrial Mathematics can be used to calculate the shape of the optical device.
- at least one illumination insert during operation generates a punctiform white light source. This variant is used in particular when the lighting installation is used
- At least one illumination unit comprises one or more laser diodes, in particular one or more monochromatic laser diodes.
- laser diodes nowadays have beam densities, so that point-shaped light sources with high luminance can be generated.
- the direct radiance of laser diodes is much higher than conventional LEDs.
- the beam density of a blue laser diode is currently about 7x10 * watt / cm 2 , while the beam density of an LED is only 20 watts cm 2 .
- laser diodes having a light output of at least 1 watt and in particular between 1, 5 and 3.0 watt or between 1, 5 and 5 watt are preferably used.
- At least one intensifying immersion unit comprises a transducer which generates white light from the monochromatic light of the laser diode or laser diodes.
- the transducer may in this case comprise a phoephort conversion device on which the laser radiation of the laser diode or of the laser diodes is focused by means of an optical system (for example a lens), whereby the punctiform white light source is generated on the phosphor conversion layer.
- Phosphor conversion layers for the conversion of monochromatic light are known per se. For example, for a blue laser diode with an emission world length of 450 nm, a phosphor conversion layer of Ce: YAG phosphor can be used to generate white light. For violet laser light with a wavelength of 405 ⁇ m, in particular, a phosphorus conversion layer made of cerium-doped nitride-phosphorus or cerium-doped oxynitride-phosphorus is used.
- the punctiform white light source can be formed on the exit surface of the light guide. to be.
- optics which suitably focus the white light emerging from the light guide to form a punctiform light source.
- At least one illumination unit comprises a single monochromatic laser diode, which represents a punctiform light source. This variant is used in particular when a light with a specific color is to be generated with the illumination device.
- the number of lighting units installed in the lighting device can vary.
- the illumination device 10 comprises illumination units or fewer, in particular 3 to ⁇ illumination units.
- the illumination device comprises a vehicle headlight.
- a vehicle headlight is characterized by the fact that it actively illuminates the surroundings of the vehicle. Possibly.
- the lighting device according to the invention may also comprise a vehicle signal light, which is characterized by being used merely for signaling to other road users.
- the illumination device is designed in such a way that it can generate a low-beam light characteristic as a predetermined vertical distribution during operation. The characteristic of low beam is known per se and also defined in legal standards (for example SAE standard).
- a low beam is characterized by the fact that the angular distribution in the radiated light has a horizontal bright / dark boundary in order not to blind the oncoming road users.
- Femer has a dipped beam a finite range, which is preferably at about 65 m
- the illumination device is designed such that it can generate a Femiicht characterizing during operation as a predetermined light distribution.
- the light distribution of high beam is known per se and stands out in that the light is a higher range and a low beam is auteist and thus concentrated in a Weineren angle range around the vehicle axle. In particular, no range limit is specified for high beam.
- a reduction of the light emission surface generally leads to an increase in the value of the value that is exposed to an oncoming vehicle. In the case of the Femlichtfunktion a reduction in size and thus increasing the glare is not a problem, because the operation of high beam is usually provided only if no oncoming traffic comes.
- a glare-free high beam can be realized, which has a light distribution with a vertical heli / dark boundary with the highest possible contrast to the shadow area in which the oncoming traffic is located.
- the punctiform light source allows a much more precise execution of the
- one or more of the lighting units comprise, in addition to the punctiform light source generated by means of laser light, one or more conventional LEDs or light-emitting diodes whose light is not generated
- the illumination device is designed such that it can generate a light characteristic which is composed of the light of the LED or LEDs and the light of the point-shaped light source.
- the point light source generates the proportion of the light characteristic, which requires a particularly high precision.
- the light characteristic in turn can be a high-beam characteristic
- the punctiform light source is responsible for the proportion of the high beam characteristic, which represents the central high beam spot to reach the range of the high beam The light distribution around this Femlichtspot with a shorter range is thereby by the LED or LEDs generated. Possibly.
- the LED or LEDs and the punctiform light source are switched separately to generate specific light distributions.
- the illumination device according to the invention can also be provided for the generation of other light distributions.
- the illumination device can also assume the function of a plurality of different headlights or signal lights.
- the lighting device can also be a daytime vision and / or a turn signal and / or a reversing light and / or a fog light and / or a Cornering light and / or a marker light and / or a tail light and / or a brake light and / or a dynamic light spot and the like.
- the illumination device is configured such that it has one or more predetermined structures, in particular one or more surface forms and / or one or more strips and / or one or more spots and / or one or more arrows and / or can generate one or more symbols and / or one or more characters as a predetermined light distribution.
- the optical device used in the illumination device according to the invention may be designed differently depending on the application.
- this device comprises at least one reflector and / or at least one lens.
- the illumination device can have compact dimensions due to the use of point-like light sources with high luminance.
- the maximum extension of the optical device in plan view i.e., in the main beam direction with maximum intensity
- the invention further comprises a
- FIG. 1 shows a schematic representation of the structure of a lighting device according to the invention for a motor vehicle.
- the invention is described based on a lighting device in the form of a headlight of a motor vehicle, with which the environment is actively illuminated.
- a lighting device in the form of a headlight of a motor vehicle, with which the environment is actively illuminated.
- the Frorrtscheinwerfer is the
- the illumination device according to the invention can, if necessary, also be realized as a signal light in the motor vehicle, such as, for example, as a brake light, turn signal and the like.
- a plurality of lighting fixtures designated by reference numeral 1 is used, wherein only one of the lighting units is reproduced and the other units can be arranged beside or above or below the illustrated lighting units.
- the illumination unit comprises a laser diode 2 with a laser beam exit surface 201, an attachment optics 3 indicated as a lens, and a phosphor conversion layer 4.
- a free-form surface 6 is provided for the illumination unit, which is designed as a specular reflector in the embodiment of FIG.
- each lighting unit can be provided for each lighting unit separate free-form surfaces. It is also possible that a contiguous freeform surface is formed for all lighting units.
- a blue laser diode with an emission wavelength of 450 nm is used, in which the beam density is about 7 ⁇ 10 s watts / m 2 .
- the laser diode stiffens a substantially punctiform light source whose emission characteristic A is indicated schematically. Point-shaped here means that the jet area compared to the other components of the lighting device is much smaller, so that in very good
- the dimension L1 of the illumination unit 1 in the horizontal direction is approximately 15 mm.
- the distance L2 between the layer 4 and the free-form surface 8 is substantially greater than the extent L1 and is between 3 and 10 cm.
- the representation of FIG. 1 is not to scale.
- a light-emitting surface in the form of a rectangle with edge lengths of 10 ⁇ m and 15 ⁇ m is generated by the laser diode in plan view along the optical axis O.
- the optical system 3 focuses the radiation of the laser diode onto a phosphor conversion layer 4.
- Phosphor transformation shichites are known per se from the prior art and serve to produce monochromatic laser light to generate white light.
- Ce: YAG phosphor is preferably used as the material of the phosphor conversion layer.
- other materials may be used. For example, if a violet laser diode with an emission world-wavelength of 405 nm is used, the phosphor material of cerium-doped nitride or cerium-doped oxynitride is used in a preferred variant.
- a white light source 5 is generated above the phosphor conversion layer, which in turn can be regarded as punctiform in comparison to the dimensions of the illumination device, ie the radiation emanating from the light source emanates in very good approximation from a single point.
- the emission characteristic of the punctiform light source 5 is indicated schematically in FIG. 1 and designated by reference symbol A '.
- the extension of the beam surface of the punctiform light source 5 in a plan view along the optical axis O is greater than the extent of the beam path of the laser diode 2 due to scattering effects in the phosphor conversion material.
- Approximately one Siran Ifl view ml edge lengths in the range of 500 ⁇ m are formed.
- the luminance is about 2x10 8 Cd / m 2 , Ggf, even higher luminances in the range of 10 * Cd / m 2 and higher can be achieved.
- the light of the point-shaped white light source 5 finally falls on the reflector 6, which is arranged at a distance L2 from the white light source.
- the reflector surface 6 is indicated only schematically and has an asymmetrical structure. This expresses that in combination with the laser illumination unit 1 any free-form surfaces can be used, via which, depending on the application, the desired light distribution in the far field » eg low beam or high beam, can be generated. It is advantageous that due to the high luminance of the punctiform white light source 5 very little space is required to produce a desired light distribution.
- the maximum extent of the free-form surface 6 in the plane perpendicular to the optical axis O is only in the range of 30 to 50 mm, which is significantly lower than in conventional headlamps.
- the use of the punctiform white light source has the further advantage that the shape of the free-form surface 6 can be calculated algorithmically simple and highly accurate for generating the desired light distribution, eg with the ITWM algorithm mentioned in the introduction. It is therefore not necessary that a reflector always has to be used as the free-form surface 6; on the contrary, any other free-radiopacity in the form of a lens or a combination of lens and reflector can also be used.
- the Ausenseingsformen of the invention explained in the foregoing have a rage of advantages.
- a point-like light source with high luminance can be generated, whereby almost perfect free-form surfaces can be defined, via which a desired light distribution can be generated with high accuracy.
- the use of laser light furthermore creates an efficient illumination device with a low electrical output. Furthermore, the installation space of the illumination device can be reduced, which is advantageous in particular when generating vehicle interior light.
- the illumination device enables targeted illumination with wide field regions of good imaging quality. Furthermore, with the illumination device, a glare-free high beam with a vertical bright / dark boundary can be achieved with very high contrast, so that the shadow area in which the oncoming traffic is located can be made as narrow as possible. In addition, high quality low beam distribution can be achieved. Furthermore, various other types of headlight or signal light can be generated with the illumination device according to the invention. In particular, a perfume light, a cornering light, a fog light, a flashing light, a brake light, a taillight, a reversing light, a cornering light, a dynamic spotlight, and the like can be provided.
- the invention is not limited to the generation of white light, but it may possibly be used directly as a point light source, the monochromatic light of the laser diode. This variant is used in particular for signal lights, which usually emit light in a predetermined color (for example red).
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102011085378A DE102011085378A1 (de) | 2011-10-28 | 2011-10-28 | Beleuchtungseinrichtung für ein Kraftfahrzeug |
| PCT/EP2012/070559 WO2013060609A1 (de) | 2011-10-28 | 2012-10-17 | Beleuchtungseinrichtung für ein kraftfahrzeug |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2771611A1 true EP2771611A1 (de) | 2014-09-03 |
| EP2771611B1 EP2771611B1 (de) | 2020-12-23 |
Family
ID=47071256
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP12775663.3A Active EP2771611B1 (de) | 2011-10-28 | 2012-10-17 | Beleuchtungseinrichtung für ein kraftfahrzeug |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US9562660B2 (de) |
| EP (1) | EP2771611B1 (de) |
| CN (1) | CN103765085B (de) |
| DE (1) | DE102011085378A1 (de) |
| WO (1) | WO2013060609A1 (de) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104373899B (zh) * | 2014-12-05 | 2018-06-19 | 李建宏 | 单频激光束输出白光的装置 |
| DE102015001695A1 (de) | 2015-02-10 | 2016-08-11 | Audi Ag | Beleuchtungsvorrichtung für einen Scheinwerfer eines Kraftfahrzeugs sowie Verfahren zum Betreiben einer Beleuchtungsvorrichtung |
| DE102015118302A1 (de) * | 2015-10-27 | 2017-06-01 | Hella Kgaa Hueck & Co. | Beleuchtungsvorrichtung für Fahrzeuge |
| DE102015221240A1 (de) * | 2015-10-30 | 2017-05-04 | Bayerische Motoren Werke Aktiengesellschaft | Beleuchtungsvorrichtung, insbesondere für ein Kraftfahrzeug |
| DE202016000476U1 (de) * | 2016-01-27 | 2017-04-28 | Gm Global Technology Operations, Llc | Leuchtvorrichtung |
| DE102016002702A1 (de) * | 2016-03-08 | 2017-09-14 | Osram Gmbh | Lichtquellenanordnung |
| KR101747356B1 (ko) | 2016-08-02 | 2017-06-14 | 엘지전자 주식회사 | 차량용 발광기구 |
| DE102024100173A1 (de) * | 2024-01-04 | 2025-07-10 | HELLA GmbH & Co. KGaA | Projektionsmodul für einen Scheinwerfer eines Kraftfahrzeugs |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1755960A1 (de) * | 1968-07-16 | 1971-12-30 | Patra Patent Treuhand | Kraftfahrzeugscheinwerfer-System |
| US6152588A (en) | 1994-09-28 | 2000-11-28 | Sdl, Inc. | Addressable vehicular lighting system |
| DE10157314A1 (de) * | 2001-11-23 | 2003-06-12 | Wolfram Henning | Beleuchtungseinrichtung für Fahrzeuge |
| FR2840389B1 (fr) * | 2002-06-04 | 2004-12-03 | Valeo Vision | Projecteur d'eclairage elliptique comportant une source lumineuse secondaire |
| JP4047266B2 (ja) * | 2003-11-19 | 2008-02-13 | 株式会社小糸製作所 | 灯具 |
| ATE545827T1 (de) * | 2008-08-22 | 2012-03-15 | Koninkl Philips Electronics Nv | Kompaktes fahrzeugbeleuchtungssystem mit mehreren strahlenbündeln |
| CA2748045C (en) * | 2009-01-05 | 2016-04-26 | Gordon Toll | Apparatus and method for defining a safety zone for a vehicle, a person or an animal |
| KR101834893B1 (ko) * | 2009-04-09 | 2018-03-08 | 필립스 라이팅 홀딩 비.브이. | 레이저 응용을 위한 램프 |
| JP4991834B2 (ja) * | 2009-12-17 | 2012-08-01 | シャープ株式会社 | 車両用前照灯 |
| JP5232815B2 (ja) * | 2010-02-10 | 2013-07-10 | シャープ株式会社 | 車両用前照灯 |
| JP5577138B2 (ja) * | 2010-04-08 | 2014-08-20 | スタンレー電気株式会社 | 車両用前照灯 |
-
2011
- 2011-10-28 DE DE102011085378A patent/DE102011085378A1/de active Pending
-
2012
- 2012-10-17 WO PCT/EP2012/070559 patent/WO2013060609A1/de not_active Ceased
- 2012-10-17 EP EP12775663.3A patent/EP2771611B1/de active Active
- 2012-10-17 CN CN201280042897.3A patent/CN103765085B/zh active Active
-
2014
- 2014-04-18 US US14/256,298 patent/US9562660B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| US20140226352A1 (en) | 2014-08-14 |
| DE102011085378A1 (de) | 2013-05-02 |
| US9562660B2 (en) | 2017-02-07 |
| CN103765085B (zh) | 2016-05-18 |
| EP2771611B1 (de) | 2020-12-23 |
| WO2013060609A1 (de) | 2013-05-02 |
| CN103765085A (zh) | 2014-04-30 |
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