WO2020083647A1 - Panneau de del utilisant des filaments de del pour fournir un éclairage efficace et homogène - Google Patents

Panneau de del utilisant des filaments de del pour fournir un éclairage efficace et homogène Download PDF

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Publication number
WO2020083647A1
WO2020083647A1 PCT/EP2019/077356 EP2019077356W WO2020083647A1 WO 2020083647 A1 WO2020083647 A1 WO 2020083647A1 EP 2019077356 W EP2019077356 W EP 2019077356W WO 2020083647 A1 WO2020083647 A1 WO 2020083647A1
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WO
WIPO (PCT)
Prior art keywords
light
light source
elongated
face
generating system
Prior art date
Application number
PCT/EP2019/077356
Other languages
English (en)
Inventor
Rifat Ata Mustafa Hikmet
Ties Van Bommel
Original Assignee
Signify Holding B.V.
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 Signify Holding B.V. filed Critical Signify Holding B.V.
Publication of WO2020083647A1 publication Critical patent/WO2020083647A1/fr

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Classifications

    • 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
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
    • G02B6/0021—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces for housing at least a part of the light source, e.g. by forming holes or recesses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
    • F21Y2103/10—Elongate light sources, e.g. fluorescent tubes comprising a linear array of point-like light-generating elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00—Planar light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • LED panel using LED filaments for providing efficient and homogeneous lighting
  • the invention relates to a light generating system as well as to the application of such light generating system.
  • LED panels are known in the art.
  • US20110141736A1 describes a LED (light-emitting diodes) panel comprising (i) a transparent cover plate comprising a rectangular flanged frame having two recesses on each of four edges and a plurality of projections on a rear surface, (ii) a rectangular substrate comprising a plurality of through holes, a plurality of LED elements on a front surface, a plurality of electrically connected ICs (integrated circuits) on a rear surface, and four sets of first and second electrical terminals electrically connected to the ICs wherein the ICs are electrically connected to the LED elements, and (iii) a rectangular base plate comprising four sets of two cavities, wherein the base plate is secured to the rear surface of the substrate and the substrate is secured to the rear surface of the cover plate with the projections being complementarily inserted through the through holes to urge against the base plate, and each of the first and second electrical terminals being disposed adjacent to both the recess and cavity.
  • LED panels of the art may have relatively complex constructions and/or complex electrical connections with the respective LEDs.
  • the present invention may have as object to overcome or ameliorate at least one of the disadvantages of the prior art, or to provide a useful alternative.
  • the invention provides a light generating system comprising (i) a light guide element and (ii) an elongated light source, wherein the elongated light source has an axis of elongation, wherein the elongated light source is configured to provide light source light in a plurality of directions perpendicular to the axis of elongation, wherein the light guide element comprises light guiding material, wherein the light guiding material comprises a channel, wherein the elongated light source is configured within the channel, and wherein the light guiding material is configured in a light receiving relationship with the elongated light source, wherein the elongated light source has a first length Ll along which light source light is generated, wherein the elongated light source comprises a plurality of solid state light sources configured along the first length and configured to generate solid state light source light, and wherein the light guide element has a plate-like shape, wherein the elongated light source is fixated in the channel, wherein the channel comprises the
  • Such system may be a relative simple system, wherein the light source is at least partly integrated in the light guide.
  • Elongated light sources are known in the art and may in a relatively easy way be integrated in a light guide element.
  • the elongated light source may provide light source light in a plurality of radial directions, it may be about a radial emitter.
  • light source light may couple into the light guide element and in this way be distributed over the light guide element.
  • the light in the light guide element may escape from the light guide element and emanate in a direction away from the light guide element (from one or more of the one or more faces).
  • the light generating system further comprises a fastening means, configured to fixate the elongated light source in the channel.
  • a fastening means configured to fixate the elongated light source in the channel.
  • an adhesive material may be applied, though other embodiments may also be possible, e.g. a clamp, a spring, etc.
  • the elongated light source is fixated in the channel, wherein the channel comprises the elongated light source and an adhesive for fixating the elongated light source in the channel.
  • the term“fastening means” may also refer to a plurality of (different) fastening means.
  • the adhesive is a light transmissive adhesive, thereto it may be translucent or transparent.
  • the adhesive may at least partially embed or surround the elongated light source, or fully embed or surround the light source at least locally, for example over 50% or 70% or 90% of the channel.
  • the light transmissive adhesive may be provided at one location but may also be provided at a plurality of locations in the channel.
  • the light transmissive adhesive fully surrounds the elongated light source over the whole portion of the elongated light source that is accommodated in the channel.
  • the channel may be completely filled with the elongated light source and the light transmissive adhesive.
  • the adhesive may essentially have a light transmissivity in the same ranges as defined above in relation to the light guiding material, for example in that the light transmitting adhesive is of the same material as the light guide, for example PMMA or PC, or, in the case that the elongated light source is a LED filament, for example in that the light transmissive material is of the same material as an encapsulant material of the filament, for example silicone.
  • the light transmissive adhesive may be provided with a layer structure which improves the dissipation of heat away from the elongated light source, attained by the feature that said layer structure improves the thermal conductivity of the light transmissive adhesive.
  • a layer structure might be comprised of, for example, an inorganic light transmissive and thermally conductive component, for example a component selected from a group including Aluminum Nitride, Aluminum Oxide, Silicon Nitride, Titanium Dioxide, Tantalum Pentoxide and Hafnium Oxide.
  • the phrase“plurality of directions” may in embodiments also indicate that relative to the axis of elongation there is light source light generated over the entire 360° (around the axis of elongation). Hence, in a plane perpendicular to the axis of elongation, in essential any direction in that plane light source light is generated.
  • the light source light may not only escape in a direction perpendicular to the axis of elongation, but also under an angle to the axis of elongation.
  • the luminescent material may essentially be a Lambertian emitter
  • light source light may escape under essentially 180° relative to the axis of elongation, wherein the 180° indicates a (virtual) kind of semi-circle configured parallel to the axis of elongation, wherein the axis of elongation may be the virtual basis of the (virtual) kind of semi-circle.
  • the elongated light source may in embodiments be an elongated Lambertian emitter, i.e.
  • the term“kind of semi-circle” is used as, in the case of a point-light source a semi-circle (or in fact circle) would be relevant, whereas here the semi-circle (or circle) is elongated, as the light source is elongated. Hence, the light source light may essentially escape from the light source in any direction.
  • the light generating system may be part of or may be applied in e.g. office lighting systems, household application systems, shop lighting systems, home lighting systems, accent lighting systems, spot lighting systems, theater lighting systems, fiber-optics application systems, projection systems, self-lit display systems, pixelated display systems, segmented display systems, warning sign systems, medical lighting application systems, indicator sign systems, decorative lighting systems, portable systems, automotive applications, (outdoor) road lighting systems, urban lighting systems, green house lighting systems, horticulture lighting, or LCD backlighting.
  • office lighting systems household application systems, shop lighting systems, home lighting systems, accent lighting systems, spot lighting systems, theater lighting systems, fiber-optics application systems, projection systems, self-lit display systems, pixelated display systems, segmented display systems, warning sign systems, medical lighting application systems, indicator sign systems, decorative lighting systems, portable systems, automotive applications, (outdoor) road lighting systems, urban lighting systems, green house lighting systems, horticulture lighting, or LCD backlighting.
  • the invention also provides a backlighting system comprising the light generating system as (further) defined herein.
  • a luminaire comprising the light generating system as (further) defined herein.
  • the light generating system may be configured as luminaire or may be comprised by a luminaire.
  • the backlighting system or luminaire may include further optical elements, like beam shaping elements, diffusers, mirrors, lenses, etc. etc.
  • the invention provides a light generating system comprising (i) a light guide element and (ii) an elongated light source.
  • the light guide may be rigid, rendering it relatively reliable, but alternatively it may be flexible rendering it shapeable.
  • the light guide element may be shaped as a plate, optionally having one or more curvatures, especially in the plane of the plate.
  • the waveguide element may also have other shapes.
  • the light guide element may have a length and a width and a height, wherein an aspect ratio of the length and the height is at least 2, such as an aspect ratio of at least 5, like in the range of 5-5000, like 10-2500, and wherein an aspect ratio of the width and the height is at least 2, such as an aspect ratio of at least 5, like in the range of 5-5000, like 10-2500.
  • the terms“length”,“width”, and“height” may also refer to “largest length”,“largest width”, and“largest height”, respectively.
  • the light guide element has a rectangular cross-sectional shape (perpendicular to a plane of the light guide element, or perpendicular to the length (or width) of the light guide element.
  • the light guide element may in (other) embodiments also have a cross-section having a circular shape.
  • the length and the width may be identical, and one may use instead the term“diameter” (with the light guide in embodiments having the same aspect ratio ranges as in embodiments defined above).
  • the height (or thickness) of the light guide element may in embodiments be selected from the range of 0.5-50 mm, such as 1-20 mm.
  • the light guide element comprises a material (“light guiding material”) that is light transmissive.
  • the light transmissive material may in embodiments comprise one or more materials selected from the group consisting of a transmissive organic material, such as selected from the group consisting of PE (polyethylene), PP (polypropylene), PEN
  • PC polyethylene napthalate
  • PC polycarbonate
  • PMA polymethylacrylate
  • PMMA polymethylmethacrylate
  • CAB cellulose acetate butyrate
  • silicone polyvinylchloride
  • PET polyethylene terephthalate
  • PETG glycol modified polyethylene terephthalate
  • PDMS polymethylmethacrylate
  • the light transmissive material may comprise an aromatic polyester, or a copolymer thereof, such as e.g.
  • the light transmissive material may comprise polyethylene terephthalate (PET).
  • the light transmissive material is especially a polymeric light transmissive material.
  • the light transmissive material may comprise an inorganic material.
  • the inorganic light transmissive material may be selected from the group consisting of glasses, (fused) quartz, transmissive ceramic materials, and silicones, such as e.g. polydimethylsiloxane (PDMS.
  • PDMS polydimethylsiloxane
  • hybrid materials, comprising both inorganic and organic parts may be applied.
  • the light transmissive material comprises one or more of PMMA, transparent PC, or glass.
  • the transmission of the light transmissive material for one or more light source light wavelengths may be at least 80%/cm, such as at least 90%/cm, even more especially at least 95%/cm, such as at least 98%/cm, such as at least 99%/cm.
  • values for transmission especially refer to transmission without taking into account Fresnel losses at interfaces (with e.g. air).
  • the term“transmission” especially refers to the internal transmission.
  • the internal transmission may e.g. be determined by measuring the transmission of two or more light transmissive materials having a different width over which the transmission is measured. Then, based on such
  • the mean free path for the wavelength of interest only taking into account scattering effects may be at least 0.5 times the length of the light transmissive material, such as at least the length of the light transmissive material, like at least twice the length of the light transmissive material.
  • the mean free path only taking into account scattering effects may be at least 5 mm, such as at least 10 mm.
  • the wavelength of interest may especially be the wavelength at maximum intensity of the light source light.
  • the term“mean free path” is especially the average distance a ray will travel before experiencing a scattering event that will change its propagation direction.
  • the terms“light” and“radiation” may herein interchangeably be used, unless clear from the context that the term“light” only refers to visible light.
  • the terms“light” and “radiation” may thus refer to UV radiation, visible light, and IR radiation. In specific embodiments, especially for lighting applications, the terms“light” and“radiation” refer to visible light.
  • UV radiation may in specific embodiments refer to near UV radiation (NUV). Therefore, herein also the term“(N)UV” is applied, to refer to in general UV, and in specific embodiments to NUV.
  • IR radiation may in specific
  • NIR near IR radiation
  • the term“visible light” especially relates to light having a wavelength selected from the range of 380-780 nm.
  • the transmission can be determined by providing light at a specific wavelength with a first intensity to the light transmissive material under perpendicular radiation and relating the intensity of the light at that wavelength measured after transmission through the light transmissive material, to the first intensity of the light provided at that specific wavelength to the material (see also E-208 and E-406 of the CRC Handbook of Chemistry and Physics, 69th edition, 1088-1989).
  • light guiding material may also refer to a plurality of different light guiding materials.
  • the light guiding material comprises a channel, for at least partly hosting a light source (see also below).
  • the channel may be elongated.
  • the channel may include curves, including right curves, and may be meandering.
  • the channel may also be a straight channel, e.g. from one edge to another edge of the light guide element.
  • the channel is enclosed by the light guide material, i.e. the channel is embedded in the light guide material.
  • the channel is embodied as a groove or a slot.
  • channel may also refer to plurality of channels of which two or more may be in fluid communication, though this is not necessarily the case.
  • the light guide element may in embodiments include a plurality of (embedded) channels.
  • the system further comprises an elongated light source.
  • elongated light source refers to a light source having a length that is larger than a width or height.
  • the light source may have a length and a width and a height, wherein an aspect ratio of the length and the height is at least 2, such as an aspect ratio of at least 5, like in the range of 5-1000, like 5-500, and wherein an aspect ratio of the length and the width is at least 2, such as an aspect ratio of at least 5, like in the range of 5- 1000, like 5-500.
  • the terms“length”,“width”, and“height” may also refer to“largest length”,“largest width”, and“largest height”, respectively.
  • the light source may also have a cross-section having an essentially circular shape. In such embodiments the length and the width may be identical, and one may use instead the term“diameter” (with the light source in embodiments having the same aspect ratio ranges as in embodiments defined above).
  • the height and/or width (or diameter) of the elongated light source may in embodiments be selected from the range of 0.2-15 mm, such as 0.5-8 mm.
  • the elongated light source is especially configured such that the axis of elongation is essentially parallel to a plane of the light guide element.
  • the channel, and, correspondingly the elongated light source(s), are configured in a meandering structure in the light guiding material. This may be a way to distribute the light source light of the light guide element. Especially, in
  • the elongated light source may be configured in a meandering structure in the light guiding material (120), wherein the meandering structure comprises at least three turns, such as at least five turns, like at least 7 turns, like at least 10 turns, such as at least 15 turns.
  • the elongated light source may be configured in a spiral, especially comprising at least three loops, such as at least five loops, like at least 7 loops, like at least 10 loops, such as at least 15 loops.
  • the meandering structure or the spiral may also be provided with a plurality of elongated light sources, such as e.g. at least five elongated light sources (in case of a meandering structure) or e.g. at least about 15 elongated light sources (in the case of a spiral structure).
  • the meandering structure or spiral may include curves and/or comers between adjacent elongated light sources.
  • the light guiding material comprises a plurality of elongated light sources configured in a regular pattern over the light guide element. This may also be a way to distribute the light source light of the light guide element.
  • the light source is configured to provide light source radiation in one or more directions perpendicular to an axis of elongation.
  • the light source may in
  • embodiments especially be a radial radiator.
  • the elongated light sources may also be a plurality of exes of elongation.
  • the elongated light sources may especially be configured in a regular pattern.
  • the elongated light source may have a straight axis of elongation, when the elongated light source is straight.
  • the elongated light source may also- in embodiments - include a plurality of segments of which two or more may be configured under an angle (1 180°) relative to one another.
  • the elongated light source may include one or more curvatures, for instance a curved segment or two segments that are configured under an angle and which are connected via a curved segment.
  • the axis of elongation may also include one or more curvatures and/or one or more axis of elongation segments that are configured under an angle (1 180°) relative to one another.
  • the light source may be a radial radiator having - during operation- an intensity of light in any angle over 360° perpendicular to the axis of elongation.
  • the intensity may differ over the angle, though especially a lowest intensity is not lower than 1/6 of an average intensity (intensity averaged over the angles relative to the elongated axis), such as not lower than 1/3 of an average intensity; likewise, a highest intensity is especially not higher than 6* an average intensity, such as not higher than 3* an average intensity.
  • the elongated light source is configured to provide light source light in a plurality of directions perpendicular to the axis of elongation.
  • the elongated light sources (200) have first lengths (Ll), wherein parallel configured neighboring elongated light sources (200) have shortest distances (Dl).
  • shortest distances (Dl) are equal to or shorter than the first lengths (Ll) of the elongated light sources (200).
  • Ll>Dl such as Ll>2*Dl, like L l >3 * D 1.
  • the (accrued) length of the elongated light sources may be used as the first length (and not the length of an individual elongated light source of the plurality of elongated light sources).
  • a chain of elongated light sources may be applied.
  • the light generating system comprises a long elongated light source or a plurality of elongated light source configured in a spiral or a meander.
  • the latter two embodiments may also be seen as a single long elongated light source.
  • the elongated light source may have a first length (Ll), wherein the light guide element has a length (L), wherein the first length (Ll) of the elongated light source is larger than the length (L) of the light guide element.
  • Ll>L like Ll>2*L, such as Ll>3*L.
  • the elongated light source is configured within the channel.
  • the channel is configured with dimensions allowing hosting the elongated light source. Therefore, a channel height and width, or channel diameter, may be selected to host the elongated light source. Likewise, the length of the channel may be selected to host the elongated light source. In general, the channel will be larger than the (first length of the) elongated light source.
  • the channel encloses the elongated light source over at least 180° (radial angle), even more over at least 270°, relative to the axis of elongation.
  • a virtual ray starting from the axis of elongation will hit light transmissive material of the light guide element over at least 180°, even more especially at least 270° relative to the axis of elongation.
  • the light source When the light source is partially recessed in the channel, this may provide a better thermal management. When the light source is fully recessed, especially embedded, an improved light incoupling may be achieved. However, in embodiments over at least 50% of a length of the channel, such as over at least 80% of a length of the channel, one or more elongated light sources are configured.
  • the channel is configured to enclose the entire elongated light source over at least part of the (first) length of the elongated light source.
  • the channel is configured to enclose the entire elongated light source over its entire first length.
  • Light source light that is generated by the elongated light source will at least partly enter the light transmissive material.
  • the light guiding material is configured in a light receiving relationship with the elongated light source. Therefore, especially in embodiments the channel, the elongated light source, and the light guide element are configured such that during operation at least part of the light source light enters the light guide material. At least part of the light that enters the light guide element will also escape therefrom via one or more faces of the light guide element. Therefore, especially in embodiments the channel, the elongated light source, and the light guide element are also configured such that during operation at least part of the light source light that has entered the light guide material will also escape therefrom. Light that escapes from the system may herein also be indicated as“system light” or“light generating system light”.
  • the elongated light source comprises a plurality of solid state light sources configured along the first length (Ll) and configured to generate solid state light source light. In this way, light may be generated in a radial direction over the first length of the elongated light source. As the (solid state) light sources are distributed over the first length of the elongated light source it may be achieved that along the first length of the elongated light source, the light source light is generated.
  • the term“light source” may refer to a semiconductor light-emitting device, such as a light emitting diode (LEDs), a resonant cavity light emitting diode (RCLED), a vertical cavity laser diode (VCSELs), an edge emitting laser, etc..
  • the term“light source” may also refer to an organic light-emitting diode, such as a passive-matrix (PMOLED) or an active-matrix (AMOLED).
  • the light source comprises a solid state light source (such as a LED or laser diode).
  • the light source comprises a LED (light emitting diode).
  • the term LED may also refer to a plurality of LEDs.
  • the term“light source” may in embodiments also refer to a so-called chips-on-board (COB) light source.
  • COB chips-on-board
  • the term“COB” especially refers to LED chips in the form of a semiconductor chip that is neither encased nor connected but directly mounted onto a substrate, such as a PCB.
  • a plurality of semiconductor light sources may be configured on the same substrate.
  • the semiconductor light sources may be arranged in a single row or in an array, for example an array having a ratio of number of LEDs in a single row to a number of LEDs in a single column in the range of at least ten, preferably at least twenty or fifty, and even up to thousand, i.e.
  • the plurality of LEDs may be arranged in an array with an aspect ratio in the range of at least ten, preferably at least twenty or fifty, and even up to thousand.
  • the substrate could be transparent, e.g. made of quartz, glass, or a transparent polymer, thus enabling light to be emitted from the LEDs or converted by the luminescent material to propagate through the substrate, thus to not to limit an omnidirectional emission.
  • a COB is a multi LED chip configured together as a single lighting module.
  • the term“light source” may also relate to a plurality of light sources, such as 2-2000 solid state light sources.
  • the elongated light source may comprise a first light- emitting device comprising: an elongated bar-shaped package extending sideways, the package being formed such that a plurality of leads are formed integrally with a first resin with part of the leads exposed; a light-emitting element that is fixed onto at least one of the leads and that is electrically connected to at least one of the leads; and a second resin sealing the light-emitting element, characterized in that the first resin and the second resin are formed of optically transparent resin, and the leads have outer lead portions used for external connection and protruding sideways from both left and right ends of the package.
  • the elongated light source may comprise a first light- emitting device comprising: an elongated package being formed such that a plurality of leads are formed integrally with a first resin; a plurality of light-emitting elements that are fixed onto at least one of the leads and that are electrically connected to at least one of the leads; and an optically transparent second resin sealing the light-emitting elements, wherein the first resin includes side walls which are higher than upper surfaces of the leads, and an entire lower surface of the package is covered with the first resin; and wherein the leads are formed of a metal material and part of the leads have outer lead portions used for external connection which protrude from both ends of the package in longitudinal direction, characterized in that the first resin is formed of optically transparent resin.
  • the elongated light source may comprise a first light-emitting device comprising: an elongated bar-shaped package with left and right ends, the package being formed such that a plurality of leads are formed integrally with a first resin with part of the leads exposed; a light-emitting element that is fixed onto at least one of the leads and that is electrically connected to at least one of the leads; and a second resin sealing the light-emitting element, wherein the leads are formed of metal, an entire bottom surface of the light-emitting element is covered with at least one of the leads, an entire bottom surface of the package is covered with the first resin, the first resin has a side wall that is integrally formed with a portion covering the bottom surface of the package and that is higher than upper surfaces of the leads, the first resin and the second resin are formed of optically transparent resin, the second resin that is filled to a top of the side wall of the first resin and that includes a fluorescent material having a larger specific gravity than that of the second resin, the leads have outer lead portions
  • the second resin includes fluorescent material.
  • the first light-emitting device may comprise: a plurality of first light-emitting devices as described above; a filament including these light-emitting devices; and power supply leads electrically connected to the filament, wherein the filament is so configured that adjacent ones of outer lead portions are firmly attached and connected in series such that adjacent ones of the light-emitting devices are V-shaped, and both ends of the outer lead portions connected in series are firmly attached to the power supply leads.
  • Such type of elongated light sources wherein a plurality of solid state light sources is configured on a support with a resin including luminescent material configured around at least part of the plurality of LEDs are known in the art as (embodiments of) rigid or flexible LED filaments. They may generate white light, due to the combination of e.g. blue emitting solid state light sources and a luminescent material, such as a cerium comprising garnet, that is configured to convert part of the blue light into yellow light, thereby providing white light.
  • a luminescent material such as a cerium comprising garnet
  • luminescing luminescent material(s) may also be applied in any of the suggested combinations, such as cyan and/or amber luminescent materials.
  • the blue emitting solid state light sources may be applied in combination with one or more of cyan light emitting solid state light sources and amber light emitting solid state light sources.
  • the cyan light emitting solid state light sources and amber light emitting solid state light sources, respectively, may be obtained with using the same type of solid state light source used for generating the blue solid state light source light, but in combination with a specific luminescent material.
  • the elongated light source comprises a LED filament
  • the elongated light source comprises luminescent material configured to convert at least part of the solid state light source light into luminescent material light
  • the light source light comprises the luminescent material light and optionally solid state light source light.
  • the resin with the luminescent material comprised therein simultaneously cause an omnidirectional emission of the light generated by the filament, i.e. the resin with luminescent material functions similar to or simultaneously acts as a diffusor.
  • the luminescent material is located/provided only on the LED die and not in the resin (though the luminescent material may be provided both on the die and in the resin), and that a diffusor and/or diffusing function is comprised in the resin to ensure the omnidirectional emission of the generated light from/by the filament.
  • luminescent material may thus also refer to a plurality of different luminescent materials.
  • the light source light will have a spectral distribution with a plurality of wavelengths, such as is the case with the blue light of a blue LED or with the yellow light of a trivalent cerium comprising garnet based luminescent material or many Eu 2+ based luminescent material.
  • the elongated light source is configured to generate white light.
  • white light herein, is known to the person skilled in the art. It especially relates to light having a correlated color temperature (CCT) between about 2000 and 20000 K, especially 2700-20000 K, for general lighting especially in the range of about 2700 K and 6500 K, and for backlighting purposes especially in the range of about 7000 K and 20000 K, and especially within about 15 SDCM (standard deviation of color matching) from the BBL (black body locus), especially within about 10 SDCM from the BBL, even more especially within about 5 SDCM from the BBL.
  • CCT correlated color temperature
  • the light source may also provide light source light having a correlated color temperature (CCT) between about 5000 and 20000 K, e.g. direct phosphor converted LEDs (blue light emitting diode with thin layer of phosphor for e.g. obtaining of 10000 K).
  • CCT correlated color temperature
  • the light source is configured to provide light source light with a correlated color temperature in the range of 5000-20000 K, even more especially in the range of 6000-20000 K, such as 8000-20000 K.
  • An advantage of the relative high color temperature may be that there may be a relative high blue component in the light source light.
  • the terms“violet light” or“violet emission” especially relates to light having a wavelength in the range of about 380-440 nm.
  • the terms“blue light” or“blue emission” especially relate to light having a wavelength in the range of about 440-495 nm (including some violet and cyan hues).
  • the terms“green light” or“green emission” especially relate to light having a wavelength in the range of about 495-570 nm.
  • the terms“yellow light” or “yellow emission” especially relate to light having a wavelength in the range of about 570- 590 nm.
  • the terms“orange light” or“orange emission” especially relate to light having a wavelength in the range of about 590-620 nm.
  • red light or“red emission” especially relate to light having a wavelength in the range of about 620-780 nm.
  • the terms “visible”,“visible light” or“visible emission” refer to light having a wavelength in the range of about 380-780 nm.
  • a plurality of elongated light sources may all provide light source light having essentially the same lighting properties.
  • controlling and similar terms especially refer at least to determining the behavior or supervising the running of an element.
  • controlling and similar terms may e.g. refer to imposing behavior to the element
  • controlling may additionally include monitoring.
  • control system which may also be indicated as“controller”.
  • the control system and the element may thus at least temporarily, or permanently, functionally be coupled.
  • the element may comprise the control system. In embodiments, the control system and element may not be physically coupled. Control can be done via wired and/or wireless control.
  • control system may also refer to a plurality of different control systems, which especially are functionally coupled, and of which e.g. one control system may be a master control system and one or more others may be slave control systems.
  • a control system may comprise or may be functionally coupled to a user interface.
  • the system, or apparatus, or device may execute an action in a“mode” or “operation mode” or“mode of operation”. Likewise, in a method an action or stage, or step may be executed in a“mode” or“operation mode” or“mode of operation”.
  • the term“mode” may also be indicated as“controlling mode”. This does not exclude that the system, or apparatus, or device may also be adapted for providing another controlling mode, or a plurality of other controlling modes. Likewise, this may not exclude that before executing the mode and/or after executing the mode one or more other modes may be executed.
  • a control system may be available, that is adapted to provide at least the controlling mode.
  • the choice of such modes may especially be executed via a user interface, though other options, like executing a mode in dependence of a sensor signal or a (time) scheme, may also be possible.
  • the operation mode may in embodiments also refer to a system, or apparatus, or device, that can only operate in a single operation mode (i.e.“on”, without further tunability).
  • the light guide element has a plate-like shape.
  • the light guide element comprises a first face and a second face (defining a light guide thickness), wherein the light guiding material is configured between the first face and the second face.
  • the light guide material may have two oppositely arranged faces, indicated as first face and second face, respectively.
  • the first face and second face bridge the light guide material, and may form one or more edges.
  • the first face and the second face may also be indicated as“first major face” and“second major face” respectively. Especially, in general these two faces provide more than 50%, even more than 80% of the total external surface of the light guide material.
  • the channel is configured as recession at the second face.
  • the channel may be configured to partly enclose the elongated light source over at least part of its length (see also above).
  • the light source may be configured such that the axis of elongation is essentially parallel to the first face. Likewise, the axis of elongation may essentially be parallel to the second face. Therefore, in embodiments the light guiding material is configured between the first face and the second face, and the axis of elongation is configured parallel to the first face and the second face.
  • the channel is configured as duct in the light guiding material.
  • the channel may be configured to entirely enclose the elongated light source over at least part of its length (see also above).
  • the channel may especially be embedded in the light guide material.
  • a light guide element may comprise different types of channels.
  • the elongated light source will be fully enclosed over at least part of its first length.
  • there is a full (radial) enclosure i.e. a 360° enclosure (radial angle relative to the axis of elongation).
  • the enclosure With an open channel, the enclosure will be less than 360°, though especially not smaller than 180°, such as not smaller than 270°.
  • the light generating system is configured to couple at least part of the light source light out from the light guide element via the first face during operation of the light generating system.
  • the system may include one or more reflector elements.
  • the light guide element comprises a reflector element, such as a reflective edge, or when downstream thereof a reflector element is configured, such as downstream of an edge, or downstream of the second face, light will be reflected back into the light guide element.
  • Faces or edges may be made reflective by e.g. providing diffuse reflective elements (or scattering structures), like by introducing roughness.
  • a specular reflector may be provided downstream of the light guide element, like a reflective layer on part of the light guide element.
  • the terms“upstream” and“downstream” relate to an arrangement of items or features relative to the propagation of the light from a light generating means (here the especially the light source), wherein relative to a first position within a beam of light from the light generating means, a second position in the beam of light closer to the light generating means is“upstream”, and a third position within the beam of light further away from the light generating means is“downstream”.
  • a reflector configured downstream of a face (or edge), as indicated above, may also be considered upstream when the light is reflected at the reflector.
  • “downstream” may also refer to configured at a face (or edge) such that light escaping from the light guide material is (at least partly) reflected back into the light guide material.
  • the system is configured to provide at least 50% of the light that is coupled out from the system via the first face and/or the second face, especially via at least the first face.
  • the system is configured to provide at least 50% of the light that is coupled out from the system only via the first face, and essentially not via other faces (including edge(s)), such as especially at least 80%, like especially at least 90%, such as essentially all light. This may be useful for certain (down)light applications, or for backlighting applications.
  • the system is configured to provide at least 50% of the light that is coupled out from the system only via the first face and the second face, and essentially not via other faces (including edge(s)), such as especially at least 80%, like especially at least 90%, such as essentially all light. This may be useful for certain downlight applications, such as suspended downlight luminaires.
  • the system may be configured to provide light via one or more of the first face and the second face, and via at least part of the edge. This may also be useful for certain (down)light applications, such as suspended downlight luminaires.
  • the system is configured to provide at least 50% of the light that is coupled out from the system only via an edge, and essentially not via other faces (i.e. the first face and the second face), such as especially at least 80%, like especially at least 90%, such as essentially all light. This may be useful for certain lighting applications, such as suspended downlight luminaires.
  • the distribution of the light that escapes from the light guide element via one or more faces (including edge(s)) may, as also indicated above, be controlled by using one or more specular reflectors, one or more diffuse reflectors, etc.
  • the shape of the light guide element may be chosen to promote outcoupling or total internal reflection at one or more parts of the light guide element.
  • the desired light outcoupling may be obtained.
  • the one or more reflector elements and the outcoupling elements may be chosen and configured such to have outcoupling essentially only via the first face, or essentially only via the second face, or essentially only via the edge, or essentially only via the first face and the second face, etc. (see also four (non-limiting) examples of
  • Total internal reflection is the phenomenon which occurs when a propagated light ray strikes a medium boundary at an angle larger than a particular critical angle with respect to the normal to the surface.
  • an edge or a first face or a second face may provide a possibility to couple out from the light guiding material, one or more reflector elements may be configured to reflect the light back in the light guiding material, wherein e.g. after total internal reflection a final outcoupling may be achieved (at a desired face or edge).
  • the intensity of the light that escapes via one or more of the first face and the second face may vary spatially.
  • the outcoupling may be stronger closer to the elongated light source, than further away. This may lead to undesired intensity variations.
  • reflective areas and/or scattering areas may be provided at those regions of the one or more of the first face and the second face where the outcoupled intensity may be relatively large. In this way, light is reflected back into the light guide material, distributed therefore, and may escape elsewhere. Such reflective and/or scattering areas may not fully block escape of the light from the light guide material but may reduce outcoupling.
  • the first face comprises an optical element for promoting an even distribution of the intensity of the outcoupled light source light over the first face.
  • the optical element is aligned with the elongated light source.
  • the optical element may comprise one or more of a reflector and a diffuser.
  • the optical element may comprise a feature that promotes outcoupling of light, such as surface roughness.
  • the light guiding material may be sandwiched between a reflector and a diffuser.
  • the light guiding element may comprise light guiding material sandwiched between a reflector and a diffuser.
  • the system comprises a plurality of elongated light sources.
  • the first face may comprise a plurality of the optical elements for promoting an even distribution of the intensity of the outcoupled light source light over the first face, wherein the optical elements are aligned with the plurality of elongated light sources.
  • the optical element may comprise one or more of a reflector and a diffuser.
  • the optical element may comprise a feature that promotes outcoupling of light, such as surface roughness.
  • optical element may also refer to a plurality of (different) optical elements.
  • the term reflector may refer to one or more of a specular reflector and a diffuse reflector.
  • the term“reflector” may also refer to a plurality of (different) reflectors.
  • the elongated light source is in embodiments essentially not configured as edge lighting. Especially this may apply to embodiments wherein the elongated light source is fully enclosed over at least part of its first length.
  • Figs la-lb schematically depict some aspects of embodiments of an elongated light source
  • Figs. 2a-2c schematically depict some aspects of embodiments of the light generating system and of the light guide element
  • Figs. 3a-3g schematically depict some further aspects of embodiments of the light generating system and of the light guide element.
  • Figs la-lb schematically depict an embodiment of an elongated light source 200.
  • the elongated light source 200 has a first length Ll along which light source light 201 is generated.
  • the elongated light source 200 comprises a plurality of solid state light sources 210, which are configured along the first length Ll and configured to generate solid state light source light 211.
  • the light source light 201 may essentially consist of the solid state light source light.
  • the light source light may comprise luminescent material light 221, which is based on an at least partial conversion of the solid state light source light 211 into luminescent material light 221 by a luminescent material 220.
  • the light source light may comprise luminescent material light 221 and solid state light source light 211.
  • the solid state light sources 210 may be available on a substrate 205. Further, the solid state light sources 210 (and the substrate 205) may especially be embedded in a light transmissive material (in general different from the light transmissive material of the light guide element), such as a resin.
  • the light transmissive material enclosing the light sources is indicated with reference 206.
  • the light transmissive material may comprise, such as embed, a luminescent material 220.
  • this light transmissive material 206 may be a resin comprising luminescent material 220, such as an inorganic luminescent material in an organic resin.
  • the resin may e.g. an acrylate or a silicone resin or an epoxy resin, etc.
  • the light transmissive material 206 encloses the solid state light sources 210 and the substrate 205, light that is generated within the light transmissive material 206 may radiate in essentially any direction (perpendicular to an axis of elongation 202). This is also shown in the cross-sectional view in Fig. lb.
  • the elongated light source 200 in embodiments the elongated light source 200 is configured to provide light source light 201 in a plurality of directions perpendicular to the axis of elongation 202.
  • Figs la-lb schematically depict an embodiment of the elongated light source 200, wherein the elongated light source 200 comprises a LED filament, wherein the elongated light source 200 comprises luminescent material 220 configured to convert at least part of the solid state light source light 211 into luminescent material light 221, and wherein the light source light 201 comprises the luminescent material light 221 and optionally solid state light source light 211.
  • light source light 211 is generated over essentially 360° around the axis of elongation 202 (see Fig. lb).
  • Fig. la relative to the axis of elongation 202 segments or a kind of elongated semi-circles, or a kind of elongated circles, can be defined, in which also light source light is generated over essentially 180° or 360°, respectively, see Fig. la.
  • Figs. 2a-2b schematically depict embodiments of a light generating system 1000 comprising (i) a light guide element 100 and (ii) an elongated light source 200.
  • the light guide element 100 comprises light guiding material 120.
  • the light guiding material 120 comprises a channel 130, wherein the elongated light source 200 is configured within the channel 130.
  • three channels 130 are depicted in both Figs. 2a-2b. However, more or less channels 130 may be available (see also below).
  • the channel is a groove while in Fig. 2b the channel is a tunnel fully surrounded by the light guide material, i.e. embedded therein.
  • the light guiding material 120 is configured in a light receiving relationship with the elongated light source 200. Hence, part of the light source light of the elongated light sources 200 will enter the light guiding material 120, and leave the light guiding material via one or more of the faces.
  • second face 112 is drawn at the top; first face 111 is drawn at the bottom.
  • the edge is indicated with reference 113.
  • the light guide material 120 (or light guide element 100) has the first face 111 and the second face 112, defining a height H.
  • the light guide element 100 may comprise a first face 111 and a second face 112.
  • the light guiding material 120 is configured between the first face 111 and the second face 112.
  • the light guide material 120 (or light guide element 100) may in embodiments have a length F and a width W.
  • the light guide element 100 has a plate-like shape.
  • the light guide element will have the same dimensions as the light guide material, i.e. length L and width W (or a diameter), and height H.
  • Reference Dl indicates the shortest distance between two parallel arranged neighboring elongated light sources 200.
  • parallel configured neighboring elongated light sources 200 have shortest distances Dl which are equal to or shorter than the first lengths (Ll) of the elongated light sources (200).
  • the channel 130 is configured as recession 131 at the second face 112.
  • the channel 130 is configured as duct 132 in the light guiding material 120.
  • the elongated light source 200 is partly enclosed by the light guide material 120 over its entire first length Fl in the schematically depicted embodiment of Fig. 2a, and is entirely enclosed by the light guide material 120 over its entire first length Fl in the schematically depicted embodiment of Fig. 2a.
  • the (radial) angle of enclosure in Fig. 2a may be about 270° (and is thus 360° in Fig. 2b).
  • Fig. 2c schematically depicts an embodiment of the light generating system in operation.
  • the light generating system 1000 is configured to couple at least part of the light source light 201 out from the light guide element 100 via the first face 111 during operation of the light generating system 1000.
  • control system C may control the intensity of the light source light 201 of one or more elongated light sources 200.
  • Fig. 2c schematically depicts an embodiment wherein the first face 111 comprises an optical element 140 for promoting an even distribution of the intensity of the outcoupled light source light 201 over the first face 111.
  • the optical element 140 comprises one or more of a reflector and a diffuser.
  • the reflector may be a full-reflector or a semi-transparent reflector which reflects part of the light source light 201 and emits (an)other part thereof.
  • the diffusor may allow transmission of part of the light source light and scattering of (an)other part of the light source light.
  • the optical element 140 also transmits part of the light source light 201.
  • the first face 111 may include a diffusor, such as a layer having diffusing properties. Fikewise, to the second face 112 a diffusor may be provided. This may be useful when also light source light 201 should escape via the second face 112.
  • a reflector 1140 may be applied to one or more of the edge 113 and the second face 112.
  • this may also apply to the embodiments schematically depicted in e.g. Figs. 2a and 2b. Note that Figs. 2a and 2 schematically depict flat plate-like light guide element 100.
  • the plate-like light guide element 100 may also include one or more curvatures, such as a 1D curvature (like part of a cylinder) or a 2D curvature (like part of a ball) (both types of embodiments are not depicted herein).
  • curvatures such as a 1D curvature (like part of a cylinder) or a 2D curvature (like part of a ball) (both types of embodiments are not depicted herein).
  • Figs. 3a and 3b schematically depict cross sections of some options of channels 130 and light guiding elements 100.
  • Fig. 3a schematically depicts a fully recessed channel 131 in the top example, an embedded channel 132 in the middle example, and a further embedded channel 132 at the bottom example.
  • the enclosure is over about 270° (radial angle) relative to the axis of elongation, and is a full (radial) enclosure, i.e. 360° in the middle example.
  • elongated light sources 200 extending along a respective axis 202 is fully surrounded by a respective light transmissive adhesive 1001 which completely fills up the respective fully embedded channel 130 (which in this case can be considered as a tunnel).
  • the light transmissive adhesive material is low density polyethylene having a refractive index n a of about 1.52 which matches with the refractive index ni of about 1.49 of the PMMA light guiding material.
  • Fig. 3b schematically depict further embodiments of optical elements 140, like structures in the first face 111 and/or second face 112, or a reflector or a diffuser on the first face 111 and/or on the second face 112.
  • the first face 111 (and/or the second face 112) comprises a plurality of the optical elements 140 for promoting an even distribution of the intensity of the outcoupled light source light 201 over the first face 111 (and/or over the second face 112), wherein the optical elements 140 are aligned with the plurality of elongated light sources 200.
  • Figs. 3c-3e schematically depict some embodiments of arrangements of elongated light sources, such as a linear arrangement (left) and in interdigitated arrangement (right) in Fig. 3d.
  • Fig. 3e schematically depicts three different regions, wherein the elongated light sources are arranged in 2 directions (left), indicated with reference 2d, in 3 directions (middle), indicated with reference 3d, and in 4 directions (right), indicated with reference 4d.
  • the elongated light sources 200 may be electrically coupled, which is not shown in the schematic drawing for the sake of clarity.
  • the light guiding material 120 comprises a plurality of elongated light sources 200 configured in a regular pattern over the light guide element 100.
  • 3f-3g schematically depict some embodiments of meandering structures of the elongated light source 200.
  • the elongated light source comprises a plurality of smaller functionally coupled elongated light sources 200.
  • the elongated light source comprises a plurality of smaller functionally coupled elongated light sources 200.
  • the channel 130 and correspondingly, the elongated light source 200, are configured in a meandering structure in the light guiding material 120.
  • Figs. 3f and 3g schematically depict embodiments of a very long elongated light source or of a series of elongated light sources (configured especially in series).
  • the length Ll of the elongated light source is the length of the entire series of elongated light sources.
  • Adjacent configured parts, configured parallel, may have a shortest distance Dl as defined above.
  • the (accrued) length Ll may be much larger than the length L or width W of the plate like light guide element 100.
  • Ll>L like Ll>2*L, such as Ll>3*L.
  • Ll>W like Ll>2*W, such as Ll>3*W.
  • Reference L200 indicates the total length of the elongated light source that is configured in a non-straight line, such as meandering or spiral. L200 may also be used for the length of an elongated light source comprising a plurality of elongated light sources
  • L200>L like L200>2*L, such as L200>3*L.
  • L200>W like L200>2*W, such as L220>3*W.
  • the terms“substantially” or“essentially” herein, and similar terms, will be understood by the person skilled in the art.
  • the terms“substantially” or“essentially” may also include embodiments with“entirely”,“completely”,“all”, etc. Hence, in embodiments the adjective substantially or essentially may also be removed.
  • the term “substantially” or the term“essentially” may also relate to 90% or higher, such as 95% or higher, especially 99% or higher, even more especially 99.5% or higher, including 100%.
  • the term“and/or” especially relates to one or more of the items mentioned before and after“and/or”.
  • a phrase“item 1 and/or item 2” and similar phrases may relate to one or more of item 1 and item 2.
  • the term “comprising” may in an embodiment refer to "consisting of' but may in another embodiment also refer to "containing at least the defined species and optionally one or more other species”.
  • the invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer.
  • a device claim, or an apparatus claim, or a system claim enumerating several means, several of these means may be embodied by one and the same item of hardware.
  • the mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
  • the invention also provides a control system that may control the device, apparatus, or system, or that may execute the herein described method or process. Yet further, the invention also provides a computer program product, when running on a computer which is functionally coupled to or comprised by the device, apparatus, or system, controls one or more controllable elements of such device, apparatus, or system.
  • the invention further applies to a device, apparatus, or system comprising one or more of the characterizing features described in the description and/or shown in the attached drawings.
  • the invention further pertains to a method or process comprising one or more of the characterizing features described in the description and/or shown in the attached drawings.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

L'invention concerne un système de génération de lumière (1000) comprenant (i) un élément de guidage de lumière (100) et (ii) une source de lumière allongée (200), la source de lumière allongée (200) ayant un axe d'allongement (202), la source de lumière allongée (200) étant configurée pour fournir une lumière de source de lumière (201) dans une pluralité de directions perpendiculaires à l'axe d'allongement (202), l'élément de guidage de lumière (100) comprenant un matériau de guidage de lumière (120), le matériau de guidage de lumière (120) comprenant un canal (130), la source de lumière allongée (200) étant configurée à l'intérieur du canal (130), le matériau de guidage de lumière (120) étant configuré dans une relation de réception de lumière avec la source de lumière allongée (200), la source de lumière allongée (200) ayant une première longueur (L1) le long de laquelle une lumière de source de lumière (201) est générée, la source de lumière allongée (200) comprenant une pluralité de sources de lumière à semi-conducteurs (210) configurées le long de la première longueur (L1) et configurées pour générer une lumière de source de lumière à semi-conducteurs (211) et l'élément de guidage de lumière (100) ayant une forme de type plaque.
PCT/EP2019/077356 2018-10-25 2019-10-09 Panneau de del utilisant des filaments de del pour fournir un éclairage efficace et homogène WO2020083647A1 (fr)

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WO2023186916A1 (fr) * 2022-04-01 2023-10-05 Signify Holding B.V. Système d'éclairage laser comprenant une fibre optique

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