EP4314636A1 - Pièce décorative dotée d'un guide de lumière plan - Google Patents

Pièce décorative dotée d'un guide de lumière plan

Info

Publication number
EP4314636A1
EP4314636A1 EP22703909.6A EP22703909A EP4314636A1 EP 4314636 A1 EP4314636 A1 EP 4314636A1 EP 22703909 A EP22703909 A EP 22703909A EP 4314636 A1 EP4314636 A1 EP 4314636A1
Authority
EP
European Patent Office
Prior art keywords
light guide
light
film
decorative part
flat
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
EP22703909.6A
Other languages
German (de)
English (en)
Inventor
Hubert Bieder
Eva-Susanne Jaeger
Daniel Betz
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.)
Mercedes Benz Group AG
Original Assignee
Mercedes Benz Group AG
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 Mercedes Benz Group AG filed Critical Mercedes Benz Group AG
Publication of EP4314636A1 publication Critical patent/EP4314636A1/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q3/00—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors
    • B60Q3/60—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors characterised by optical aspects
    • B60Q3/62—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors characterised by optical aspects using light guides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q3/00—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors
    • B60Q3/50—Mounting arrangements
    • B60Q3/54—Lighting devices embedded in interior trim, e.g. in roof liners
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0003—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being doped with fluorescent agents
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V2200/00—Use of light guides, e.g. fibre optic devices, in lighting devices or systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/003—Lens or lenticular sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0065—Manufacturing aspects; Material aspects

Definitions

  • the invention relates to a decorative part with a flat light guide for actively illuminating a surface section according to the type defined in more detail in the preamble of claim 1.
  • DE 102014 006490 B4 claims a planar lighting element with a light source and a planar light guide as well as a transparent film, with the film and the light guide being made of materials with different refractive indices and the light guide being produced by back-injection molding of the film, i.e. similar to the status mentioned above the technology is trained.
  • US 2007/0 133 935 A1 describes a flexible optical element with a waveguide.
  • DE 102019202 804 A1 describes a light guide film that can be used in a film composite.
  • DE 102013 021 600 A1 also describes a surface light which is made up of different layers.
  • the core is in each case a transparent support structure, which is combined with a light guide made of foils, so that the support structure is formed with a lower refractive index than the foil of the actual light guide. This can also be closed off by a further film with a lower refractive index and decoupling structures in order to decouple light through the transparent carrier structure.
  • An illuminated decorative part is known from DE 102014 112 470 A1.
  • light beams generated by a light source are coupled into a composite film with a light-guiding layer.
  • a very similar decorative part is also known from US 2021/0 055 567 A1.
  • the object of the present invention is therefore to specify an improved decorative part with a flat light guide for actively illuminating a surface section.
  • the decorative part according to the invention with a flat light guide for actively illuminating a surface section and with at least one light source arranged on the front side of the flat light guide now provides that the light source has at least one illuminant connected directly or indirectly to the flat light guide comprises, which is arranged concealed behind a non-translucent surface section in a direction of view of the decorative part and is connected to the flat light guide.
  • the arrangement and coupling of the light source is thus arranged in particular in an area behind a section that is not transparent to light.
  • This section which is designed as an opaque surface section of the decorative part, thus covers the light coupling into the flat light guide as well as the light source itself Its actively illuminated surface enables an extraordinarily homogeneous and even coloring that is easy to design, which allows a great deal of design freedom with a high quality impression either directly or via a corresponding transparent decor placed in front of it.
  • the flat light guide of the decorative part according to the invention comprises three layers comparable to the light guide described in the prior art mentioned at the outset, with two layers designed as foils having a lower refractive index than a light guide layer arranged between them.
  • One of the foils also has decoupling structures for the light, similar to those described in the prior art mentioned at the outset.
  • the layers form a composite film in which the light guide layer is also formed as a film.
  • Such a structure in which the hitherto always made of a solid material, for example a flat material made of polycarbonate or the like or made of such a material produced by injection or back injection, always has a relatively large thickness of typically at least 3 to 5 mm due to the principle and relatively low flexibility.
  • the result is an extraordinarily compact structure, which is easy to implement in practice with a thickness of significantly less than one millimeter, in particular approximately 0.5 mm, of the film composite.
  • the films of the planar light guide are co-extruded, so that simple and efficient production is possible.
  • the films themselves can, for example, consist of two Polymethyl methacrylate (PMMA) films are made, between which a film made of polycarbonate (PC) is inserted as a light-conducting layer.
  • PMMA Polymethyl methacrylate
  • PC polycarbonate
  • the entire structure can be produced simply and efficiently by coextrusion with a very small layer thickness and high mechanical strength in relation to the layer thickness.
  • the light source is formed in the decorative part according to the invention by a coupling light guide with at least one integrated light source.
  • a coupling light guide with at least one integrated light source.
  • the flat light guide consists of a composite film.
  • the flat light guide and the coupling-in light guide can together form a lighting element.
  • the composite film is provided with a protective layer on one or both sides.
  • This protective layer can in turn be a film, for example a further polycarbonate film, but it can also be a lacquer or the like.
  • the protective layers can of course also be dispensed with.
  • a lighting element of the decorative part according to the invention can comprise such a planar light guide as has just been described, as well as a light guide of greater thickness coupled to the composite film.
  • the thickness relates to the comparison to the light-conducting film of the film composite.
  • This light guide which in particular is not formed from a film, is used to couple the light into the light-guiding layer of the planar light guide, which is designed as a film.
  • this light guide of greater thickness is coupled to at least one light source.
  • the coupling can be implemented, for example, on a strip made of polycarbonate in such a way that one or more light sources, in particular LEDs, can be mechanically coupled to the structure.
  • the bulbs, and possibly a Control electronics for these can, however, also be directly integrated into this light guide of greater thickness, for example injected.
  • This light guide of greater thickness which could also be referred to as a coupling light guide, has the task of capturing the light emitted by the lamps and, especially if different colors are used, to homogenize this light within its overall length before it is introduced into the light-conducting film as Light guide layer takes place.
  • multicolored light always requires a certain running length of the light within a light guide until a homogeneous color mixture is created, so that this can also be achieved within the larger light guide before the then homogeneous light is coupled into the corresponding light guide layer of the flat light guide.
  • the light guide with a greater thickness can be glued or welded to the composite film, or it can also be molded directly onto it.
  • this light guide can be conventional, for example made of a single material such as polycarbonate, which is surrounded by an air gap in order to achieve the light-conducting properties, namely total reflection at the interfaces between the material of the light guide and the air.
  • this light guide of greater thickness is surrounded by a coating made of a material with a lower refractive index.
  • This material can, for example, in turn be a film made of PMMA or the like, so that in principle a structure of the light guide of greater thickness can be provided in the form of DE 102019 001 333 A1 from the prior art mentioned at the outset.
  • Alternative coatings for example paints or the like, are of course also conceivable.
  • a further very advantageous embodiment of the decorative part according to the invention can now also provide that the flat light guide is connected to a carrier and a decoration by co-extrusion, calendering and/or back-injection molding.
  • This structure made up of carrier, decoration and flat light guide can then be injection-molded onto the non-light-conducting surface section and the light source or, conversely, these can be injection-molded onto the structure. All in all, this results in an extraordinarily compact and efficient decorative part, particularly when the flat light guide is designed as the composite film described above.
  • planar light guide according to the invention, the lighting element according to the invention and the decorative part according to the invention offer further advantages and configurations, which result in particular from the exemplary embodiments which are described in more detail below with reference to the figures.
  • FIG. 1 shows a basic representation of a possible embodiment of a flat light guide
  • FIG. 2 shows a basic section through a possible decorative part according to the invention with a first embodiment of a lighting element
  • Fig. 3 shows a principle section through a possible decorative part according to the invention with a further embodiment of a lighting element
  • Fig. 4 different ways of connecting the light source to a light guide.
  • a possible structure of a flat light guide 1 made of a film composite 2 is shown in principle.
  • the film composite 2 consists of at least three films.
  • a central light-guiding layer is designed as a light-guiding film 3 . It is implemented, for example, as a polycarbonate film.
  • This light guide foil 3 is enclosed by two foils 4, 5 with a lower refractive index than that of the light guide foil 3.
  • the two foils 4, 5 can be made of PMMA (polymethyl methacrylate), for example.
  • PMMA polymethyl methacrylate
  • These decoupling structures 6 can, for example, by a ground surface, by a Structures introduced by laser processing can be realized via structures printed by screen printing or the like.
  • planar light guide 1 can be adapted to a later curvature or the like of the planar light guide 1 in order to achieve a uniform and homogeneous light output independently of the three-dimensional geometric design of the later structure.
  • the direction in which the light is coupled out is at the top in the illustration in FIG.
  • the structure described here consisting of the three films 3, 4, 5, is completely sufficient for the actual film composite 2 of the planar light guide 1.
  • this structure can be realized with injection-moulded decorative layers, injection-moulded support layers or the like.
  • the structure can also be placed in a corresponding injection molding tool and shaped three-dimensionally before it is completed by back-injection molding with a carrier layer and/or the application of a decorative layer on the upper surface from viewing direction B and is cured in the shape specified by the tool.
  • the film composite 3 shown as an example in FIG. 1 has a thickness of less than 1 mm.
  • the thickness of the structure can be further reduced, so that, for example, a functional, flat light guide can be made from the three Foils 3, 4, 5 can be realized with a layer thickness of about 0.5 mm.
  • the enclosed light-guiding layer of the light-guiding foil 3 is somewhat thicker than the respective layer thickness of the adjacent PMMA foils 4, 5, as is also indicated approximately to scale in the illustration in FIG.
  • the film composite 2 of the planar light guide 1 can therefore preferably be combined with a coupling-in light guide 8 with greater thickness.
  • This is shown in principle in the following representation of FIG.
  • the structure shown there includes a decorative part 10 which has a flat light guide 1 .
  • This is made up of the film composite 2, in particular with the three films 3, 4, 5, whereby in the illustration in Figure 2 of this film composite 2 only the decoupling structures designated 6 are shown again, in order to show the alignment of the film composite 2 of the planar light guide 1 to make recognizable in the representation of Figure 2.
  • the direction of light is directed upwards here, the line of sight B accordingly from top to bottom onto the decorative part 10.
  • This consists of a plastic carrier 11 and a decorative panel, for example made of polycarbonate, wood, aluminum or the like.
  • the surface section 12 that is transparent to the light is also adjoined by an opaque surface section, which is designated here by 13 and is shown with correspondingly changed hatching.
  • This section 13 is impermeable to light and therefore, viewed from the viewing direction B, hides the components lying behind it in the viewing direction B.
  • these are the in-coupling light guide 8 with the greater thickness, which is designed as a conventional light guide and has corresponding out-coupling structures 9 in a manner known per se.
  • This decoupling light guide can be realized, for example, molded onto the film composite 2 of the planar light guide 1, so as light, which in the Light guide 8 is coupled via lamps shown later, pass on in the flat light guide. From viewing direction B, the structure of the light guide 8 and its connection to the film composite 2 is below the non-translucent surface area, so that the coupling of the light and its transmission are not visible through the translucent section 12 of the decorative panel.
  • the decorative part 10 can therefore be realized with a homogeneous illumination of its actively illuminated surface section 12 through the composite film 2 of the planar light guide 1 without the typically inhomogeneously illuminated area of the light coupling point becoming visible.
  • the conventional light guide 8 serves to collect the light from the individual light sources and, due to its greater thickness, can collect the light from these light sources very well, so that a large part of the light reaches the conventional light guide 8 and, via this, the planar light guide 1.
  • different colored light sources or light sources that are able to generate different colors for example RGB LEDs, can be used. Due to the size of the conventional light guide 8, there is a sufficient path for the light to travel so that the colors mix sufficiently and a homogeneous light color reaches the area of the flat light guide 1.
  • the conventional light guide 8 is surrounded by air, so that if it is made of a material such as polycarbonate, it is sufficient.
  • the air surrounding it then forms the environment with a lower refractive index than that of the polycarbonate, so that the light-guiding effect is achieved accordingly and the light can be coupled largely completely into the composite film 2 of the flat light guide 1 .
  • the conventional light guide 8 is molded onto the structure of the film composite 2 on the one hand and onto the structure of the decorative part 10 on the other hand.
  • the structure is formed, for example, with the surface section 13 that is impermeable to light being sprayed.
  • the conventional light guide 8 must be provided with a corresponding coating made of a material with a low refractive index. It can, for example, be surrounded by a film made of PMMA or coated with a corresponding paint with low-index properties.
  • FIG. 4 three different possibilities for coupling light into the conventional light guide 8 are shown.
  • several light sources 14, here RGB LEDs are mechanically coupled to the structure of the light guide in order to supply it with light over a corresponding area and to pass on the light according to the arrow marked 15, in particular to the molded film composite 2 .
  • FIG. 4b An alternative structure is shown in the illustration in FIG. 4b. Instead of several small lamps 14, as shown in FIG. 4a, two larger lamps 16 are each arranged on the end faces of the conventional light guide 8 and couple the light. The light can then be coupled out of the conventional light guide 8 upwards or downwards or towards or away from the viewer, for example, via outcoupling structures not shown here.
  • FIG. 4c A further variant of the conventional light guide 8 can also be seen in the illustration in FIG. 4c.
  • the lighting means 14 are again designed as smaller LEDs than in the illustration in FIG. 4b. Unlike in the previous figures, they are injected directly into the material of the light guide 8, for example into the polycarbonate.
  • this structure would also be conceivable with larger lamps in the area of the end faces as a supplement or as an alternative to the structure shown here.
  • the light coupling of FIGS. 4a and 4b could be combined with one another.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Manufacturing & Machinery (AREA)
  • Planar Illumination Modules (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)

Abstract

L'invention concerne un guide de lumière plan (1) comprenant au moins trois couches (3, 4, 5, 7), deux couches se présentant sous la forme de films (4) présentant un indice de réfraction inférieur à celui d'une couche de guidage de lumière (3) agencée entre ces dernières, l'un des films (4) présentant des structures de couplage de sortie (6) destinées à la lumière. L'invention est caractérisée en ce que les couches (3, 4, 5, 7) forment un composite de film (2) avec la couche de guidage de lumière formée à l'intérieur sous la forme d'un film (3). De plus, l'invention concerne un élément lumineux comprenant un tel guide de lumière planaire (1) et un guide de lumière de couplage d'entrée couplé (8). En outre, une pièce décorative (10) est spécifiée dans laquelle une source de lumière comprenant des moyens d'éclairage (14, 16) et le guide de lumière de couplage d'entrée (8), ladite source de lumière étant couplée au guide de lumière plan (1), est agencée de sorte qu'une partie de surface est éclairée activement et qu'une partie de surface qui n'est pas transmissive à la lumière dissimule la source de lumière et le couplage, comme vu depuis une direction de visualisation (B).
EP22703909.6A 2021-03-23 2022-01-27 Pièce décorative dotée d'un guide de lumière plan Pending EP4314636A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021001512.6A DE102021001512B4 (de) 2021-03-23 2021-03-23 Zierteil mit einem Flächenlichtleiter
PCT/EP2022/051844 WO2022199907A1 (fr) 2021-03-23 2022-01-27 Pièce décorative dotée d'un guide de lumière plan

Publications (1)

Publication Number Publication Date
EP4314636A1 true EP4314636A1 (fr) 2024-02-07

Family

ID=80446870

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22703909.6A Pending EP4314636A1 (fr) 2021-03-23 2022-01-27 Pièce décorative dotée d'un guide de lumière plan

Country Status (6)

Country Link
EP (1) EP4314636A1 (fr)
JP (1) JP2024511150A (fr)
KR (1) KR20230141831A (fr)
CN (1) CN116964378A (fr)
DE (1) DE102021001512B4 (fr)
WO (1) WO2022199907A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022125441A1 (de) 2022-10-01 2024-04-04 polyscale GmbH & Co. KG Optische Einheit zum Abstrahlen von Licht und Verfahren zur Herstellung einer optischen Einheit

Family Cites Families (16)

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Publication number Priority date Publication date Assignee Title
EP1575452A2 (fr) 2002-12-09 2005-09-21 Oree, Advanced Illumination Solutions Inc. Dispositif optique flexible
KR100606549B1 (ko) 2004-07-01 2006-08-01 엘지전자 주식회사 면 발광 장치용 도광판 및 그의 제조 방법
WO2007077099A1 (fr) 2006-01-06 2007-07-12 Pilkington Automotive Deutschland Gmbh Vitrage de véhicule avec ensemble de guidage de lumière
EP2157366A1 (fr) 2008-08-21 2010-02-24 Koninklijke Philips Electronics N.V. Ensemble de guide lumineux
US9507072B2 (en) * 2012-10-26 2016-11-29 Mitsubishi Rayon Co., Ltd. Light guide, manufacturing method of light guide, optical shutter, and planar light-source device
DE102013010163A1 (de) 2013-06-19 2014-12-24 Webasto SE Anordnung zum Verschließen einer Öffnung eines Fahrzeugs mit einer Scheibe und einer Lichtleiterfolie
DE102013021600A1 (de) 2013-12-20 2014-08-14 Daimler Ag Flächenleuchte
DE102014006490B4 (de) 2014-05-06 2016-04-07 Lisa Dräxlmaier GmbH Flächiges Beleuchtungselement für die lnnenausstattung eines Fahrzeugs
DE102014112470B4 (de) 2014-08-29 2018-06-21 Lisa Dräxlmaier GmbH Ausstattungsteil mit leuchtender sichtseite
KR102397362B1 (ko) * 2015-05-28 2022-05-20 엘지이노텍 주식회사 조명장치 및 이를 포함하는 차량용램프
US11054567B2 (en) 2017-05-30 2021-07-06 Temicon Gmbh Decorative light guide element
DE102019001333A1 (de) 2019-02-25 2020-01-09 Daimler Ag Beleuchtungsvorrichtung
DE102019202804A1 (de) 2019-03-01 2020-09-03 Benecke-Kaliko Ag Beschichtungsmaterial aus Kunststoff
DE102019112889B4 (de) 2019-05-16 2023-02-02 Webasto SE Fahrzeugscheibe mit Lichtleiterfolie
US11391959B2 (en) 2019-08-21 2022-07-19 Bae Systems Information And Electronic Systems Integration Inc. Laser illumination system with closely spaced beams
US11167531B2 (en) * 2019-08-30 2021-11-09 Pittsburgh Glass Works, Llc Glazing with a light guide laminate stack

Also Published As

Publication number Publication date
WO2022199907A1 (fr) 2022-09-29
CN116964378A (zh) 2023-10-27
JP2024511150A (ja) 2024-03-12
KR20230141831A (ko) 2023-10-10
DE102021001512B4 (de) 2023-03-16
DE102021001512A1 (de) 2022-09-29

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