EP4253828A1 - Kraftfahrzeugleuchtvorrichtung - Google Patents

Kraftfahrzeugleuchtvorrichtung Download PDF

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Publication number
EP4253828A1
EP4253828A1 EP22165633.3A EP22165633A EP4253828A1 EP 4253828 A1 EP4253828 A1 EP 4253828A1 EP 22165633 A EP22165633 A EP 22165633A EP 4253828 A1 EP4253828 A1 EP 4253828A1
Authority
EP
European Patent Office
Prior art keywords
colour
light
luminous device
automotive
light 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.)
Pending
Application number
EP22165633.3A
Other languages
English (en)
French (fr)
Inventor
Juan Jose SANTAELLA HERNANDEZ
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
Priority to EP22165633.3A priority Critical patent/EP4253828A1/de
Priority to PCT/EP2023/057537 priority patent/WO2023186710A1/en
Publication of EP4253828A1 publication Critical patent/EP4253828A1/de
Pending 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]
    • 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
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • F21S41/275—Lens surfaces, e.g. coatings or surface structures
    • 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

  • This invention belongs to the field of electronic assemblies comprised within the automotive luminous devices, intended to provide luminous functions to the vehicles.
  • Automotive lighting market can be considered one of the most competitive ones and new lighting functionalities are constantly required.
  • the present invention provides an automotive luminous device which is able to solve this problem.
  • the invention provides an alternative solution for providing a light beam which complies with the colour regulations by an automotive luminous device.
  • This automotive luminous device is intended to provide a lighting function, wherein the lighting function involves the projection of a light beam with a colour comprised in a predetermined colour range.
  • the automotive luminous device comprises
  • solid state refers to light emitted by solid-state electroluminescence, which uses semiconductors to convert electricity into light. Compared to incandescent lighting, solid state lighting creates visible light with reduced heat generation and less energy dissipation.
  • the typically small mass of a solid-state electronic lighting device provides for greater resistance to shock and vibration compared to brittle glass tubes/bulbs and long, thin filament wires. They also eliminate filament evaporation, potentially increasing the lifespan of the illumination device.
  • Some examples of these types of lighting comprise semiconductor light-emitting diodes (LEDs), organic light-emitting diodes (OLED), or polymer light-emitting diodes (PLED) as sources of illumination rather than electrical filaments, plasma or gas.
  • An optical part is an element that has some optical properties to receive a light beam and emit it in a certain direction and/or shape, as a person skilled in automotive lighting would construe without any additional burden.
  • Reflectors, collimators, light guides, projection lenses, etc., or the combination thereof are some examples of these optical elements which are useful for transforming the light beams emitted by the light source into an acceptable light pattern for the functionality chosen for the lighting device. All of these optical elements define a focus, which is the point where the light emitted by the light source is most effectively transmitted by the optical element.
  • the wavelength conversion layers are only in charge of providing the suitable colour for the lighting functionality, but do not provide the luminous flux necessary to fulfil the regulations.
  • the light power is provided by the light sources, not by the wavelength conversion layer.
  • the wavelength conversion layer may introduce some power losses when converting the light to a different wavelength, depending on the nature of the chosen layer.
  • the light which is finally emitted by the luminous device is comprised within the colour range defined by the corresponding regulations.
  • a colour range is defined and, despite the light emitted by the light source may be within the acceptable range, when this light is altered by the optical parts, the colour of the whole lighting device may be outside this acceptable range.
  • the wavelength conversion layer is deposited to correct the final colour and putting it back into the acceptable range.
  • the solid-state substrate is configured to emit light in a blue, deep blue or ultraviolet wavelength.
  • the additional element is a phosphor, which is arranged on the first solid-state substrate.
  • a blue solid-state substrate and a yellow phosphor is a solution which is currently employed.
  • the present invention finds a particular synergy with this type of light sources.
  • the additional element is a second solid-state substrate configured to emit in a red wavelength and third solid-state substrate configured to emit in a green wavelength.
  • a different embodiment, but also compatible with the present invention is the use of a RBG LED, with three solid-state substrates, which are used to provide a suitable colour.
  • the predetermined colour range is defined in the CIE 1931 chromaticity diagram by the following segments
  • This region corresponds to white colour, which is required by many lighting and signalling functions.
  • the wavelength conversion layer comprises quantum dots.
  • a quantum dot is an electronic structure obtained out of a semiconductor nanocrystal, with a size such that their electrons and holes are confined in all three spatial dimensions.
  • they emit light in a particular wavelength (bandgap) when they are excited, either electrically or luminescently.
  • bandgap a particular wavelength
  • red quantum dots would be quantum dots which emit light in the red bandgap when excited
  • green quantum dots would be quantum dots which emit light in the green bandgap when excited, etc.
  • quantum dots are deposited in a nanometric layer using a thin film deposition technology. By controlling the amount and density of the quantum dots, this layer could be not visible when not excited either by an electric or by a luminescent stimulator.
  • quantum dots are an advantageous solution since they provide flexibility in the design of the automotive lighting devices, which in this case is required because the car manufacturer does not know to which direction is the final colour biased, so a dynamic and customized response is required for each situation.
  • the quantum dots are deposited on a substrate layer.
  • This substrate layer may be deposited in the interior or exterior of the optical element, to modify the colour that each portion of this lightguide projects to the exterior.
  • the quantum dots are configured to be excited by blue light.
  • Blue light is preferred due to its high energy peak, since the quantum dots are excited by any light which has an energy level equal or higher than the bandgap of the quantum dots.
  • the automotive luminous device further comprises a transparent plastic cover and wherein the wavelength conversion layer is deposited on the transparent plastic cover.
  • the wavelength conversion layer may be deposited in any location between the light source and the exterior of the lighting device.
  • the deposition in the transparent plastic cover is advantageous, since it may be done with a slight intervention on the already assembled device.
  • the light source is intended to contribute to a driving beam headlamp, a passing beam headlamp, a daytime running lamp, a position lamp or an interior lighting lamp.
  • the primary optical parts comprise at least one of a reflector, a diffusor, a collimator, a lens or a bezel.
  • optical parts are usually employed in headlamps.
  • the aim of each part may be a mixture of optical and aesthetical, but in any case, they may affect to the colour of the beam which is projected outside the headlamp.
  • the invention provides a method for manufacturing an automotive lighting device according to the first inventive aspect, the method comprising the steps of
  • Figure 1 shows an automotive luminous device 51 according to the state of the art.
  • This automotive luminous device comprises a LED group 52, a reflector 53, a bezel 54 and an outer lens 55.
  • the LED group emits light in a white colour, which is suitable for contributing to the passing beam lamp function.
  • the reflector 53, the bezel 54 and the outer lens 55 due to the interposition of the reflector 53, the bezel 54 and the outer lens 55, the diffraction and reflection effects cause that the light which is finally projected outside the luminous device 51 does not comply with the national regulations.
  • Figure 2 shows a CIE 1931 chromaticity diagram, which is used in some countries to determine valid ranges for colours in different lighting and signalling functions. This diagram uses x and y coordinates, so that each particular colour is defined by these two coordinates.
  • the "white colour”, as defined in some national regulations for passing beam lamp, is defined by a zone 20 delimited by the following segments:
  • the colour emitted by the LED group of the previous figure is marked with a first point 56 in this diagram. This colour is comprised within the acceptable zone 20. However, due to the effect of the interposition of the different optical elements, the real colour which is projected by the headlamp of Figure 1 is marked with a second point 57, which is outside the acceptable zone 20.
  • a lighting device 1 according to the invention is presented in Figure 3 .
  • This automotive luminous device also comprises a LED group 2, a reflector 3, a bezel 4 and an outer lens 5.
  • the LED group 2 comprises a plurality of LEDs, each LED having a solid-state substrate, which emits in a blue wavelength, and a yellow phosphor, configured to add a different wavelength to the light emitted by the solid-state substrate, so that the light emitted by the LED is white.
  • another type of LED such as a RGB LED, with a blue substrate, a green substrate and a red substrate, may be used instead of the classic blue+phosphor LED.
  • the LED group 2 emits light in a white colour, which is comprised within the acceptable range of Figure 2 .
  • the bezel 4 and the outer lens 5 due to the interposition of the reflector 3, the bezel 4 and the outer lens 5, the diffraction and reflection effects cause that the light which would be finally projected outside the luminous device 1 would not comply with the national regulations.
  • the luminous device of this Figure 3 comprises the same LED group and the same optical elements of the device of Figure 1 , the light emitted by the device of Figure 3 (without the quantum dot layer that will be presented below) would correspond to the second point 57 of Figure 2 .
  • the difference of the present invention compared with the headlamp shown in Figure 1 is the deposition of a quantum dot layer 6 on a region of the outer lens.
  • This quantum dot layer 6 comprises a plurality of quantum dots which are configured to be excited by blue light emitted by the solid-state substrate of the LEDs. These quantum dots are carefully chosen to add a different wavelength to the one provided by the LED group, so that the light which is finally projected outside the lighting device (which would be the sum of the light emitted by the solid-state substrate, the correction of the phosphor, the effects of the optical parts and the correction of the quantum dot layer) corresponds to a value within the acceptable range 20 of Figure 2 .
  • the method of the present invention therefore comprises
EP22165633.3A 2022-03-30 2022-03-30 Kraftfahrzeugleuchtvorrichtung Pending EP4253828A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP22165633.3A EP4253828A1 (de) 2022-03-30 2022-03-30 Kraftfahrzeugleuchtvorrichtung
PCT/EP2023/057537 WO2023186710A1 (en) 2022-03-30 2023-03-23 Automotive luminous device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22165633.3A EP4253828A1 (de) 2022-03-30 2022-03-30 Kraftfahrzeugleuchtvorrichtung

Publications (1)

Publication Number Publication Date
EP4253828A1 true EP4253828A1 (de) 2023-10-04

Family

ID=81327956

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22165633.3A Pending EP4253828A1 (de) 2022-03-30 2022-03-30 Kraftfahrzeugleuchtvorrichtung

Country Status (2)

Country Link
EP (1) EP4253828A1 (de)
WO (1) WO2023186710A1 (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1671059A1 (de) * 2003-10-03 2006-06-21 General Electric Company Autoscheinwerfer mit verbesserter strahlchromatizität
US20130120688A1 (en) * 2011-11-14 2013-05-16 Planck Co., Ltd. Color regulating device for illumination and apparatus using the same, and method of regulating color
DE102013205836A1 (de) * 2013-04-03 2014-10-09 Osram Opto Semiconductors Gmbh Fahrzeugleuchte
DE102014203245A1 (de) * 2014-02-24 2015-08-27 Automotive Lighting Reutlingen Gmbh Beleuchtungseinrichtung eines Kraftfahrzeugs
EP3546821A1 (de) * 2018-03-29 2019-10-02 Valeo Iluminacion Beleuchtungsvorrichtung
WO2020157060A1 (de) * 2019-01-31 2020-08-06 Bayerische Motoren Werke Aktiengesellschaft Beleuchtungsvorrichtung für ein kraftfahrzeug

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015032439A (ja) * 2013-08-02 2015-02-16 スタンレー電気株式会社 車両用前照灯

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1671059A1 (de) * 2003-10-03 2006-06-21 General Electric Company Autoscheinwerfer mit verbesserter strahlchromatizität
US20130120688A1 (en) * 2011-11-14 2013-05-16 Planck Co., Ltd. Color regulating device for illumination and apparatus using the same, and method of regulating color
DE102013205836A1 (de) * 2013-04-03 2014-10-09 Osram Opto Semiconductors Gmbh Fahrzeugleuchte
DE102014203245A1 (de) * 2014-02-24 2015-08-27 Automotive Lighting Reutlingen Gmbh Beleuchtungseinrichtung eines Kraftfahrzeugs
EP3546821A1 (de) * 2018-03-29 2019-10-02 Valeo Iluminacion Beleuchtungsvorrichtung
WO2020157060A1 (de) * 2019-01-31 2020-08-06 Bayerische Motoren Werke Aktiengesellschaft Beleuchtungsvorrichtung für ein kraftfahrzeug

Also Published As

Publication number Publication date
WO2023186710A1 (en) 2023-10-05

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