EP3259520B1 - Beleuchtungsvorrichtung mit einem konversionselement für ein kraftfahrzeug und verfahren zum betreiben einer solchen - Google Patents

Beleuchtungsvorrichtung mit einem konversionselement für ein kraftfahrzeug und verfahren zum betreiben einer solchen Download PDF

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Publication number
EP3259520B1
EP3259520B1 EP16705731.4A EP16705731A EP3259520B1 EP 3259520 B1 EP3259520 B1 EP 3259520B1 EP 16705731 A EP16705731 A EP 16705731A EP 3259520 B1 EP3259520 B1 EP 3259520B1
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EP
European Patent Office
Prior art keywords
magnetic field
light
conversion element
field generator
border
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Application number
EP16705731.4A
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German (de)
English (en)
French (fr)
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EP3259520A1 (de
Inventor
Nicholas Schmitt
Jürgen Wilhelmy
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Audi AG
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Audi AG
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    • 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

Definitions

  • the invention relates to a lighting device for a motor vehicle, wherein the lighting device comprises a light source for providing primary light having a first wavelength spectrum, a conversion element for converting the primary light into secondary light having a predetermined second wavelength spectrum and emitting the secondary light , Furthermore, the invention relates to a motor vehicle with such a lighting device. Moreover, the invention relates to a method for operating such a lighting device.
  • Automotive lighting devices have undergone a wide variety of designs over the history of motor vehicle development with the advancement of technically available light sources. Especially for the headlamps of motor vehicles, the use of bulbs from simple incandescent bulbs to halogen bulbs leads to high-pressure gas discharge lamps (xenon light), preferably in high-end motor vehicles. Due to a significant increase in efficiency of semiconductor light sources in the form of light-emitting diodes (LEDs), they are increasingly used in all areas of automotive lighting, as they open up more possibilities in vehicle design due to their compactness.
  • LEDs light-emitting diodes
  • Front headlights of a motor vehicle must also on the one hand illuminate the road ahead of the vehicle as far as possible, without on the other hand to dazzle oncoming traffic.
  • a separate low beam and high beam are used for this, which can be provided by two separate, alternately driven headlight parts.
  • Distributed LEDs arranged in a common lighting device open up the possibility here of providing selective low-beam control of the possibility of providing dipped beam and main beam together from a lighting device.
  • a lighting device for a vehicle which comprises at least one light source and at least one arranged in the beam path of the light source optical imaging element.
  • a surface element is arranged, which is designed to illuminate the focal plane of the imaging element.
  • the surface element is arranged in the focal plane of the imaging element and has a plurality of defined surface segments defined from each other. In order to avoid glare from other road users when the high beam function is set, individual area segments are not automatically illuminated and thus not excited to emit light.
  • an adaptive lighting system for a motor vehicle comprising at least one primary light source emitting light radiation, a scanning system which receives the light radiation from the primary light source and spatially distributed to the surface of a wavelength conversion device, wherein the wavelength conversion device receives the light radiation from the at least one primary source and white Re-emits light radiation, and an optical imaging system.
  • the imaging optical system receives the white light re-emitted from the wavelength conversion device and projects this light in front of the vehicle to form a light beam.
  • the wavelength conversion device is located near a focal plane of the optical imaging system.
  • the scanning system and the optical system are on the same side of the wavelength conversion device.
  • An intensity of the white light radiation emitted by the wavelength conversion device is modulatable between a minimum value and a maximum value, wherein the variable speed sampling is performed.
  • the US Pat. No. 3,656,835 proposes a method for modulating the intensity of electromagnetic radiation, comprising: generating triplets in a system in which triplets are producible, and in which the triplets are subsequently emitted with emission of electromagnetic radiation from delayed fluorescence or, in the presence of paramagnetic quenching, phosphorescence decay and change a magnetic field strength on the system causing a change in the intensity of the emitted electromagnetic radiation.
  • a system for modulating light through a magnetic field is presented.
  • the invention is based on a generic lighting device for a motor vehicle, which is further developed by at least a first magnetic field generator for generating a magnetic field in the conversion element, whereby the emission of the secondary light is reduced within the conversion element.
  • the invention relates to a method for operating a lighting device for a motor vehicle comprising the steps of providing primary light having a first wavelength spectrum by a light source and converting the primary light into secondary light having a predetermined second wavelength spectrum through a conversion element and emitting of the secondary light. This is further developed by generating a magnetic field in the conversion element and thereby reducing the emission of the secondary light.
  • the light source is preferably a laser light source, in particular one or more laser diodes, that is to say semiconductor light sources which emit coherent radiation in a narrow wavelength range.
  • the first wavelength spectrum may be a narrow range in the blue spectral range.
  • the conversion element may comprise or consist of a phosphor.
  • the phosphor preferably has a high absorption capacity in the wavelength range in which the first wavelength spectrum, in particular its maximum, of the primary light provided by the light source lies.
  • the invention is based on the finding that a luminescent substance, often referred to in the jargon as phosphorus, can be influenced by the application of a magnetic field in its light emission. This quantum mechanical interaction is known as the Zeeman effect. Depending on the magnitude of the applied magnetic field, the emission of the secondary light with a predetermined second wavelength spectrum can thus be reduced, in particular prevented. It can also be provided to allow an emission of secondary light outside the predetermined second wavelength spectrum, which is prevented by a filtering effect of components of the lighting device at the exit from the lighting device.
  • the lighting device according to the invention has the advantage that no movable elements are provided for controlling the emission of the secondary light.
  • the first magnetic field generator is designed to generate the magnetic field in a locally limited area of the conversion element.
  • a partial light bundle in a beam path, which is imaged onto a projection surface can be selectively controlled, in particular hidden.
  • the function can be realized that the driver of an oncoming vehicle is not dazzled by just this partial light bundle is hidden, which would otherwise hit exactly the oncoming vehicle.
  • the locally limited region of the conversion element is imaged onto a dark zone of the projection surface, which has soft transitions, in particular a diffuse boundary line.
  • Such scattering effects can also be achieved, for example, by means of a suitable light-guiding element, for example in the form of reflectors (mirrors) or lenses, prisms and other light-guiding elements.
  • the conversion element is arranged on a surface bounded on the outside by an edge, in particular of a flat surface, wherein the first magnetic field generator is arranged on the edge.
  • the magnetic field generator may be in particular act a coil which is controllable with a first electric current.
  • the edge around the conversion element can in this case be covered with a - in particular multi-part - ferrite ring.
  • the ferrite ring can be structured correspondingly for receiving one or more coils for the at least first magnetic field generator.
  • An interior formed by the ferrite ring can in this case at least partially be filled with phosphor material of the conversion element.
  • the first magnetic field generator is adapted to generate a first magnetic field whose main direction is parallel to the surface and / or perpendicular to the edge.
  • the magnetic field penetrates the conversion element in its entire width and in the shortest possible way.
  • the edge has a first edge piece and a second edge piece, which run parallel to one another, and a third edge piece and a fourth edge piece, which likewise run parallel to one another.
  • the four edge pieces of the rim form a parallelogram.
  • the four edge pieces can be made the same length.
  • the first edge piece and the third edge piece are arranged at right angles to each other.
  • the four edge pieces of the edge form a rectangle, in particular a square in the case of the same length of the four edge pieces.
  • the first magnetic field generator on the first edge piece and a second magnetic field generator on the second edge piece are arranged opposite one another on a line perpendicular to the first edge piece, wherein the first magnetic field generator and the second magnetic field generator are designed to generate a first magnetic field in a first direction are.
  • a second current for driving the second magnetic field generator may be identical to the first current for driving the first magnetic field generator.
  • the first magnetic field generator and the second magnetic field generator can in particular be interconnected so that they are always controlled together, so that there is a generated by the respective magnetic field generator partial magnetic field of the first magnetic field, each having the same polarity in the first direction.
  • first magnetic field generator and the second magnetic field generator in the conversion element can be controlled separately from one another, for example to produce an inhomogeneous first magnetic field in the conversion element.
  • a third magnetic field generator on the third edge piece and a fourth magnetic field generator on the fourth edge piece are arranged opposite one another on a line perpendicular to the third edge piece, wherein the third magnetic field generator and the fourth magnetic field generator are designed to generate a second magnetic field in a second direction are.
  • the first magnetic field and the second magnetic field have an overlap region, in which a zone with increased magnetic field effect results, which corresponds to an emission-reduced zone of the conversion element.
  • the first, the second, the third and the fourth magnetic field generator are designed in the overlap region of the first magnetic field and the second magnetic field on the conversion element, a resulting magnetic field with a field strength above a predetermined first threshold and in the entire region at the conversion element outside of Overlap region to produce a resulting magnetic field with a field strength below a predetermined second threshold.
  • the first threshold value can also be equal to the second threshold value.
  • the first threshold value may represent a value for a magnetic field strength at which an emission of the conversion element is significantly reduced, in particular suppressed, in relation to a magnetic-field-free operation.
  • the emission of the conversion element when applying a magnetic field with a field strength below the predetermined second threshold is not or only slightly reduced.
  • the invention further proposes a motor vehicle with such a lighting device.
  • the lighting device is preferably a headlight, in particular a headlight of the motor vehicle.
  • these are so-called laser headlights, which are designed in particular for controlling individual partial light bundles (matrix beam).
  • FIG. 1 An energy band model without external influence as shown in Fig. 1 shows a first band level 11 (ground state), from which by means of an excitation energy 12, a second band level 13 (excited state) is reached. Starting from the second band level 13, an energy emission can take place which has an emission energy 14. As a result, a third band level 15 is achieved. Upon release of a loss energy 16 (dissipation), the first band level 11, ie the original ground state, is reached again.
  • a loss energy 16 dissipation
  • Fig. 2 shows the influence of an external magnetic field on the energy band model. Due to the influence of the external magnetic field, the second band level 13 has shifted towards a fourth band level 17. An energy difference between the original undisturbed second band level 13 and the fourth band level 17 is hereby designated by an energy shift 19. A theoretical emission energy 18 results between the fourth band level 17 and the third band level 15.
  • the excitation energy 12 may, for example, be provided in a narrow wavelength range by a laser light source.
  • the shifted fourth band level 17 in this case also an absorption capacity of a respective phosphor material in the wavelength range provided by the laser light source can be reduced to such an extent that excitation is no longer possible.
  • Fig. 3 shows a lighting device 30 according to the invention, which has a light source 21 for providing primary light 22.
  • the primary light 22 strikes a conversion element 23, which emits secondary light 26.
  • a reduced-emission zone 24 which is caused by the application of a magnetic field.
  • a light-guiding element 25 is shown, which can be configured as a lens, prism or the like. Alternatively, a design as a reflector is possible.
  • the secondary light 26 strikes a projection surface 27, which does not belong to the illumination device 30 and on which the emission-reduced zone 24 of the conversion element 23 is imaged as a dark zone 28.
  • a magnetic field generator 31, 32, 33, 34 is arranged in each case.
  • the generation of a magnetic field is possible, which reduces the emission of the secondary light 26 in the reduced-emission zone 24, in particular prevents.
  • Fig. 4 shows the conversion element 23 with the magnetic field generators 31, 32, 33, 34 in a more detailed representation.
  • the conversion element 23 has a first edge piece a, which is arranged opposite a parallel second edge piece b. At right angles to the first edge piece a and the second edge piece b, a third edge piece c and a fourth edge piece d are respectively arranged. Thus, the conversion element 23 has a rectangular shape.
  • a first magnetic field generator 31 is arranged, which faces a second magnetic field generator 32 on the second edge piece b.
  • the first magnetic field generator 31 and the second magnetic field generator 32 are configured to generate a first magnetic field represented by first magnetic field lines 35.
  • a third magnetic field generator 33 is arranged on the third edge piece c, wherein a fourth magnetic field generator 34 is arranged opposite this on the fourth edge piece d.
  • the third magnetic field generator 33 and the fourth magnetic field generator 34 are configured to generate a second magnetic field represented by second magnetic field lines 36.
  • second magnetic field lines 36 In the overlap region of the magnetic field lines 35 and the magnetic field lines 36 results in a zone with increased magnetic field effect 37.
  • the emission of the secondary light 26 is reduced by the magnetic field, the zone with increased magnetic field effect 37 thus corresponds to the reduced-emission zone 24 Fig. 3 ,
  • an alternative set of magnetic field generators 31a, 32a, 33a, 34a is shown in the same way, which generates magnetic field lines 35a and magnetic field lines 36a.
  • the first magnetic field generator 31 and the second magnetic field generator 32 are driven asymmetrically, so that the associated magnetic field in the intersection of the magnetic field lines 35 and the magnetic field lines 36 has a higher value than the magnetic field in the intersection of the magnetic field lines 35 with the magnetic field lines 36a. In this way, a variety of arrangements of zones with increased magnetic field effect 37, 37a can be generated.
  • an illumination device for a motor vehicle in particular a laser headlamp with a matrix beam function, can be designed by selective phosphor activation.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
EP16705731.4A 2015-02-21 2016-02-17 Beleuchtungsvorrichtung mit einem konversionselement für ein kraftfahrzeug und verfahren zum betreiben einer solchen Active EP3259520B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015002281.4A DE102015002281A1 (de) 2015-02-21 2015-02-21 Beleuchtungsvorrichtung mit einem Konversionselement für ein Kraftfahrzeug und Verfahren zum Betreiben einer solchen
PCT/EP2016/000267 WO2016131542A1 (de) 2015-02-21 2016-02-17 Beleuchtungsvorrichtung mit einem konversionselement für ein kraftfahrzeug und verfahren zum betreiben einer solchen

Publications (2)

Publication Number Publication Date
EP3259520A1 EP3259520A1 (de) 2017-12-27
EP3259520B1 true EP3259520B1 (de) 2018-08-29

Family

ID=55405299

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Application Number Title Priority Date Filing Date
EP16705731.4A Active EP3259520B1 (de) 2015-02-21 2016-02-17 Beleuchtungsvorrichtung mit einem konversionselement für ein kraftfahrzeug und verfahren zum betreiben einer solchen

Country Status (4)

Country Link
EP (1) EP3259520B1 (es)
DE (1) DE102015002281A1 (es)
ES (1) ES2690494T3 (es)
WO (1) WO2016131542A1 (es)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3656835A (en) * 1969-08-26 1972-04-18 Du Pont Modulation by a magnetic field of electromagnetic radiation produced by the decay of triplet states
US3843939A (en) * 1972-05-03 1974-10-22 Du Pont Method and apparatus for modulating light with a magnetic field
DE102007055480B3 (de) * 2007-11-21 2009-08-13 Audi Ag Beleuchtungsvorrichtung eines Fahrzeugs
JP5118564B2 (ja) * 2008-06-24 2013-01-16 株式会社小糸製作所 車両用灯具
US9459210B2 (en) * 2012-05-08 2016-10-04 University Of Calcutta Static magnetic field induced differential fluorescence emission
FR2993831B1 (fr) * 2012-07-27 2015-07-03 Valeo Vision Systeme d'eclairage adaptatif pour vehicule automobile
JP2014032934A (ja) * 2012-08-06 2014-02-20 Koito Mfg Co Ltd 車両用灯具

Also Published As

Publication number Publication date
EP3259520A1 (de) 2017-12-27
ES2690494T3 (es) 2018-11-21
WO2016131542A1 (de) 2016-08-25
DE102015002281A1 (de) 2016-08-25

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