WO2020173895A1 - Dispositif d'éclairage - Google Patents

Dispositif d'éclairage Download PDF

Info

Publication number
WO2020173895A1
WO2020173895A1 PCT/EP2020/054815 EP2020054815W WO2020173895A1 WO 2020173895 A1 WO2020173895 A1 WO 2020173895A1 EP 2020054815 W EP2020054815 W EP 2020054815W WO 2020173895 A1 WO2020173895 A1 WO 2020173895A1
Authority
WO
WIPO (PCT)
Prior art keywords
elongated
reflector
reflective surface
lighting elements
light
Prior art date
Application number
PCT/EP2020/054815
Other languages
English (en)
Inventor
Rifat Ata Mustafa Hikmet
Ties Van Bommel
Jiang Hong YU
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 WO2020173895A1 publication Critical patent/WO2020173895A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/68—Details of reflectors forming part of the light source
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/20—Light sources comprising attachment means
    • F21K9/23—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
    • F21K9/232—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
    • 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
    • F21V7/00—Reflectors for light sources
    • F21V7/005—Reflectors for light sources with an elongated shape to cooperate with linear light sources
    • 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
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • F21V7/05—Optical design plane

Definitions

  • the present invention relates to a lighting device comprising at least two elongated lighting elements, each lighting element comprising an elongated carrier being arranged to support a plurality of light sources such as light-emitting diodes (LEDs), and at least one elongated reflector.
  • LEDs light-emitting diodes
  • Incandescent lamps are rapidly being replaced by solid state based lighting solutions, such as, for example, light-emitting diode (LED) based lighting solutions.
  • solid state based lighting solutions such as, for example, light-emitting diode (LED) based lighting solutions.
  • the infrastructure for producing incandescent lamps based on glass may be employed, wherein the filament wire of conventional incandescent light bulbs may be replaced with LEDs emitting white light.
  • so called LED filaments may be placed in such a retrofit lamb or retrofit bulb.
  • the appearances of such lamps are generally highly appreciated by users, as the lamps may look highly decorative.
  • two or more LED filaments are arranged too close to each other, the light emitted by one of the LED filaments may get absorbed by another LED filament, which may be referred to as so called cross-talk between the LED filaments.
  • Such cross-talk may lead to a color point shift in the light emitted by the lamp, which in turn may lead to shift in the color temperature and the CRI (Color Rendering Index) of the light emitted by the lamp.
  • a lamp assembly comprising a base, an outer jacket mounted to the base, a first reflective substrate positioned within the outer jacket, and a first solid-state light source disposed proximate the first reflective substrate.
  • the outer jacket may be glass.
  • the outer jacket may hermetically seal the first solid-state light source.
  • One or more of the LED filaments may comprise wavelength converting material configured to convert at least a part of light input therein into light having a selected wavelength range.
  • wavelength material could for example be included in an encapsulant which may be at least partly enclosing the plurality of LEDs of the LED filament(s).
  • the wavelength converting material could for example comprise photo- luminescent material, such as at least one phosphor or a mixture or aggregate of several different phosphors. If one or more of the LED filaments comprises wavelength converting material configured to convert at least a part of light input therein into light having a selected wavelength range, the light emitted from a first LED filament may be absorbed by wavelength converting material that may be comprised in a second LED filament.
  • the light emitted from the first LED filament may, by the absorption thereof in the wavelength converting material of the second LED filament, be shifted to another wavelength compared to if no absorption in the wavelength converting material would have taken place. In turn, this may lead to undesired color point and CRI shifting in the light emitted by the lamp.
  • a LED filament is providing LED filament light and comprises a plurality of light emitting diodes (LEDs) arranged in a linear array.
  • the LED filament has a length L and a width W, wherein L>5W.
  • the LED filament may be arranged in a straight configuration or in a non-straight configuration such as for example a curved configuration, a 2D/3D spiral or a helix.
  • the LEDs are arranged on an elongated carrier like for instance a substrate, that may be rigid (made from e.g. a polymer, glass, quartz, metal or sapphire) or flexible (e.g. made of a polymer or metal e.g. a film or foil).
  • the carrier comprises a first major surface and an opposite second major surface
  • the LEDs are arranged on at least one of these surfaces.
  • the carrier may be reflective or light transmissive, such as translucent and preferably transparent.
  • the LED filament may comprise an encapsulant at least partly covering at least part of the plurality of LEDs.
  • the encapsulant may also at least partly cover at least one of the first major or second major surface.
  • the encapsulant may be a polymer material which may be flexible such as for example a silicone. Further, the LEDs may be arranged for emitting LED light e.g. of different colors or spectrums.
  • the encapsulant may comprise a luminescent material that is configured to at least partly convert LED light into converted light.
  • the luminescent material may be a phosphor such as an inorganic phosphor and/or quantum dots or rods.
  • the LED filament may comprise multiple sub-filaments.
  • a concern of the present invention is to provide a lighting device utilizing a plurality of LED filaments or similar lighting elements which may be arranged relatively close to each other, and wherein one or more of the LED filaments or similar lighting elements comprise wavelength converting material configured to convert at least a part of light input therein into light having a selected wavelength range, wherein any cross-talk between the LED filaments or the similar lighting elements due to them being arranged too close to each other and light emitted from a first LED filament being absorbed by wavelength converting material comprised in a second LED filament may be reduced or even avoided.
  • a lighting device comprises at least two elongated lighting elements.
  • Each elongated lighting element comprises an elongated carrier and a plurality of light-emitting diodes (LEDs), wherein the elongated carrier is arranged to support the plurality of LEDs on at least one surface of the elongated carrier.
  • Each elongated lighting element has at least one light-emitting side.
  • At least one of the elongated lighting elements comprises wavelength converting material configured to convert at least a part of light input therein into light having a selected wavelength range.
  • the lighting device comprises at least one elongated reflector.
  • Each elongated reflector has at least a first reflective surface and a second reflective surface.
  • Each elongated reflector is interposed between and arranged in relation to at least two of the elongated lighting elements such that the first reflective surface of the elongated reflector is facing in a direction towards a light-emitting side of one of the two elongated lighting elements and the second reflective surface of the elongated reflector is facing in a direction towards a light-emitting side of the other one of the two elongate+d lighting elements.
  • Each elongated reflector is solely configured to provide a light reflecting functionality for reflecting light emitted from the at least two of the elongated lighting elements.
  • At least one of shape, size or orientation of the at least one reflector in relation to the at least two elongated lighting elements between which the at least one reflector is interposed is such that for each elongated reflector, the first reflective surface of the elongated reflector is able to reflect the part or portion of the light that is emitted from one of the elongated lighting elements towards which the first reflective surface is facing and that is directed towards one of the elongated lighting elements towards which the second reflective surface of the elongated reflector is facing, so as to reduce any absorption of light emitted from the one of the elongated lighting elements towards which the first reflective surface is facing in any wavelength converting material comprised in the one of the elongated lighting elements towards which the second reflective surface is facing, and the second reflective surface of the elongated reflector is able to reflect the part or portion of the light that is emitted from the one of the elongated lighting elements towards which the second reflective surface is facing and that is directed towards the one of the elongated lighting elements towards
  • the at least one elongated reflector being interposed between two of the elongated lighting elements, with the first reflective surface of the elongated reflector facing in a direction towards a light-emitting side of one of the two elongated lighting elements and the second reflective surface of the elongated reflector is facing in a direction towards a light- emitting side of the other one of the two elongated lighting elements, reduction or even avoidance of any cross-talk between the LEDs on different elongated lighting elements due to them being arranged relatively close to each other and light emitted from a first one of the elongated lighting elements being absorbed by wavelength converting material comprised in a second one of the elongated lighting elements may be facilitated.
  • At least one of shape, size or orientation of the at least one reflector in relation to the at least two elongated lighting elements between which the at least one reflector is interposed may be such that for each elongated reflector, the first reflective surface of the elongated reflector is at most able to reflect the part or portion of the light that is emitted from one of the elongated lighting elements towards which the first reflective surface is facing and that is directed towards one of the elongated lighting elements towards which the second reflective surface of the elongated reflector is facing, so as to reduce any absorption of light emitted from the one of the elongated lighting elements towards which the first reflective surface is facing in any wavelength converting material comprised in the one of the elongated lighting elements towards which the second reflective surface is facing, and the second reflective surface of the elongated reflector is at most able to reflect the part or portion of the light that is emitted from the one of the elongated lighting elements towards which the second reflective surface is facing and that is directed towards the one of the
  • At least one of shape, size or orientation of the elongated reflector in relation to the at least two elongated lighting elements being such that only at most the above-mentioned part or portion of the light is reflected, or blocked, and not other parts or portions of the light that is emitted from one of two elongated lighting elements, a relatively high quality in the light distribution of the light emitted by the (LEDs of the) lighting device may be achieved.
  • each elongated reflector being solely configured to provide a light reflecting functionality for reflecting light emitted from the at least two of the elongated lighting elements, it is meant that each elongated reflector may be a dedicated reflector, in the sense that the reflector may be configured for (only) a particular purpose, namely to reflect light emitted from the at least two of the elongated lighting elements.
  • Each elongated reflector may be considered to be a separate component in the lighting device, which component may be configured to solely provide a light reflecting functionality.
  • Such other structure could for example comprise a Printed Circuit Board (PCB). While portions of a PCB may be able to reflect light to some extent, the PCB would not be configured only to reflect light emitted from the at least two of the elongated lighting elements between which the PCB is arranged.
  • PCB Printed Circuit Board
  • each elongated reflector being configured only to reflect light emitted from the at least two of the elongated lighting elements, it may be meant that each elongated reflector consists (only) of one or more reflective elements, without including any other elements or components such as, e.g., LEDs or LED drivers.
  • each elongated reflector being configured only to reflect light emitted from the at least two of the elongated lighting elements, it may be meant that each elongated reflector is a passive element or structure, in the sense that it does not include, e.g., components such as LEDs or LED drivers.
  • Each or any elongated lighting element may possibly comprise several elongated carriers.
  • Each of any elongated carrier of each or any elongated lighting element may for example be transparent, or translucent.
  • Each or any of the elongated lighting elements may for example be constituted by or comprise a LED filament.
  • the at least two elongated lighting elements may for example comprise a first LED filament configured to emit first LED filament light, and a second LED filament configured to emit second LED filament light.
  • the first LED filament may comprise a first plurality of LEDs emitting first LED light and a first luminescent material.
  • the first luminescent material may at least partly convert first LED light into first converted first LED light, wherein the first LED filament light may comprise first converted first LED light, or first converted first LED light and first LED light.
  • the second LED filament may comprise a second plurality of LEDs emitting second LED light and possibly a second luminescent material.
  • the second luminescent material may at least partly convert second LED light into second converted second LED light, wherein the second LED filament light may comprise second LED light, or possibly second converted second LED light or second converted second LED light and second LED light.
  • Each or any of the elongated lighting elements may comprise wavelength converting material configured to convert at least a part of light input therein into light having a selected wavelength range.
  • the wavelength converting material may for example comprise photo-luminescent material.
  • Photo-luminescent material should, in the context of the present application, be understood as any material that is capable of light emission from the material after its absorption of photons. Examples of photo-luminescent materials which may be used in conjunction with embodiments of the present invention may for example include at least one phosphor or a mixture or aggregate of several different phosphors, and/or quantum confinement structures.
  • quantum confinement structures should, in the context of the present application, be understood as e.g. quantum wells, quantum dots, quantum rods, or nano-wires.
  • a quantum well is a potential well with only discrete energy values and may be formed in semiconductors by having a material, like gallium arsenide or indium gallium nitride sandwiched between two layers of a material with a wider band gap, like aluminum arsenide or gallium nitride.
  • Quantum dots or rods, or nano-wires are small crystals of semiconducting material generally having a size, e.g. width, radius or diameter, of only a few nanometers. When excited by incident light, a quantum dot emits light of a color determined by the size and material of the crystal. Light of a particular color can therefore be produced by adapting the size and/or material of the quantum dots.
  • the at least one elongated reflector may for example be interposed between two of the elongated lighting elements at, or approximately at, a midpoint between the two elongated lighting elements.
  • the at least one elongated reflector may be closer to one of the two elongated lighting elements than to the other one of the two elongated carriers.
  • the shape, size and/or orientation of the at least one elongated reflector may be matched to the shapes, sizes and/or orientations, respectively, of the elongated lighting elements, such that for each elongated reflector, the first reflective surface of the elongated reflector is able to reflect the part or portion (e.g., the entire part or portion) of the light that is emitted from the one of the elongated lighting elements towards which the first reflective surface is facing and that is directed towards the one of the elongated lighting elements towards which the second reflective surface of the elongated reflector is facing, and the second reflective surface of the elongated reflector is able to reflect the part or portion (e.g., the entire part or portion) of the light that is emitted from the one of the elongated lighting elements towards which the second reflective surface is facing and that is directed towards the one of the elongated lighting elements towards which the first reflective surface of the elongated reflector is facing.
  • each or any of the at least one elongated reflector may have a shape, size and/or orientation in relation to the at least two elongated lighting elements so that it is able to reflect, or block, the part or portion of the light that is emitted from one of two elongated lighting elements between which the elongated reflector is interposed and that is directed towards the other one of the two elongated lighting elements such that that part or portion of the light is not able to reach the other one of the two elongated lighting elements.
  • the elongated reflector may be arranged to be sufficiently large, and/or have a sufficiently large width and/or height, so as to achieve this.
  • any cross-talk between the LEDs on different elongated lighting elements due to them being arranged relatively close to each other and light emitted from a first one of the elongated lighting elements being absorbed by wavelength converting material comprised in a second one of the elongated lighting elements may be even further facilitated.
  • at least one of shape, size or orientation of the reflector in relation to the at least two elongated lighting elements may be such that only at most the above-mentioned part or portion of the light is reflected, or blocked, and not other parts or portions of the light that is emitted from one of two elongated lighting elements.
  • the elongated lighting elements and the elongated reflector(s) may for example have a shape of strips or bands or the like.
  • Each or any elongated lighting element may have a width Wl, and each or any elongated reflector may have a width W2.
  • each or any elongated lighting element may have a length HI
  • each or any elongated reflector may have a length H2.
  • the lighting device may comprise more than two elongated lighting elements and more than one elongated reflector.
  • the lighting device may comprise at least three elongated lighting elements, and at least two elongated reflectors.
  • Each of the several elongated reflectors may be interposed between and arranged in relation to at least two of the elongated lighting elements such that the first reflective surface of the elongated reflector is facing in a direction towards a light-emitting side of one of the two elongated lighting elements and the second reflective surface of the elongated reflector is facing in a direction towards a light-emitting side of the other one of the two elongated lighting elements.
  • a lighting device comprises at least three elongated lighting elements.
  • Each elongated lighting element comprises an elongated carrier and a plurality of LEDs, wherein the elongated carrier is arranged to support the plurality of LEDs on at least one surface of the elongated carrier.
  • Each elongated lighting element has at least one light-emitting side.
  • the lighting device comprises at least two elongated reflectors.
  • Each elongated reflector has at least a first reflective surface and a second reflective surface.
  • Each elongated reflector is interposed between and arranged in relation to at least two of the elongated lighting elements such that the first reflective surface of the elongated reflector is facing in a direction towards a light- emitting side of one of the two elongated lighting elements and the second reflective surface of the elongated reflector is facing in a direction towards a light-emitting side of the other one of the two elongated lighting elements.
  • the lighting device in accordance with the first aspect or the second aspect may comprise a plurality of elongated lighting elements, of which the cross-sections thereof in a plane perpendicular to the elongated lighting elements may form a polygon like configuration.
  • the lighting device in accordance with the first aspect or the second aspect may comprise a plurality of elongated reflectors arranged in parallel with the elongated lighting elements and each of the elongated reflectors positioned on a line (e.g., in the above- mentioned plane) between two adjacent lighting elements.
  • each of the plurality of elongated lighting elements may be arranged in parallel with a longitudinal axis of the lighting device, and the cross sections of the elongated lighting elements in a plane that is perpendicular to the longitudinal axis and which the elongated lighting elements may form a polygon-shaped pattern (in the plane).
  • the lighting device may have a longitudinal axis.
  • the lighting device may comprise an elongated reflector positioned at a distance different from zero from the longitudinal axis and between two elongated lighting elements.
  • one or more elongated reflectors in the lighting device may not be arranged on, or not extend along, the (a) longitudinal axis of the lighting device.
  • one or more elongated reflectors in the lighting device may not be arranged centrally in the lighting device.
  • the lighting device could comprise several elongated reflectors, each of which may be positioned at a distance different from zero from a longitudinal axis of the lighting device (e.g., the same longitudinal axis) and between two elongated lighting elements.
  • the elongated lighting elements may or may not be arranged on, or extend along, the (a) longitudinal axis of the lighting device.
  • Each or any elongated reflector may extend along a longitudinal axis thereof, and may have a thickness in a direction perpendicular to the longitudinal axis of the elongated reflector.
  • Each or any of the elongated lighting elements may extend along a longitudinal axis thereof, and may have a thickness in a direction perpendicular to the longitudinal axis of the elongated carrier.
  • each elongated reflector may be smaller than the thicknesses of the elongated lighting elements towards which the first and second reflective surfaces of the elongated reflector are facing.
  • the elongated lighting elements and the elongated reflector(s) may for example have a shape of strips or bands or the like.
  • Each or any elongated lighting element may have a thickness Tl, and each or any elongated reflector may have a thickness T2, with T2 ⁇ Tl.
  • 0.5 ⁇ H2/H1 ⁇ 2 may hold.
  • T2 ⁇ Tl an improved spatial light distribution of the light emitted by (LEDs of the) the lighting device may be achieved.
  • At least one of the first reflective surface and the second reflective surface of at least one elongated reflector may be diffusively reflective. This may be achieved for example by providing the first reflective surface and/or the second reflective surface with a selected surface roughness.
  • any color point shifting in the light emitted by (LEDs of the) the lighting device due to any cross-talk between the LEDs on different elongated lighting elements due to them being arranged relatively close to each other and light emitted from a first one of the elongated lighting elements being absorbed by wavelength converting material comprised in a second one of the elongated lighting elements may be reduced, due to that light that is impinging on a diffusively reflective surface may be reflected at a variety of angles to the surface.
  • At least one of the first reflective surface and the second reflective surface of at least one elongated reflector may be specularly reflective. Also in this case, light that is impinging on a specularly reflective surface may be reflected at a variety of angles to the surface, which may reduce any color point shifting in the light emitted by (LEDs of the) the lighting device due to any cross-talk between the LEDs on different elongated lighting elements due to them being arranged relatively close to each other and light emitted from a first one of the elongated lighting elements being absorbed by wavelength converting material comprised in a second one of the elongated lighting elements.
  • At least one of the first reflective surface and the second reflective surface being arranged non-perpendicularly to a main direction of the part or portion of the light that is emitted from the one of the elongated carriers towards which the at least one of the first reflective surface and the second reflective surface is facing, which may ensure that light impinging on the at least one of the first reflective surface and the second reflective surface is reflected at a variety of angles to the surface.
  • the at least one of the first reflective surface and the second reflective surface that is specularly reflective may be arranged non-perpendicularly to a main direction of the part or portion of the light that is emitted from the one of the elongated lighting elements towards which the at least one of the first reflective surface and the second reflective surface is facing.
  • At least one elongated reflector may extend along a longitudinal axis thereof.
  • a cross section of the at least one elongated reflector in a plane perpendicular to the longitudinal axis thereof may for example be one of circular, oval, square, rectangular, or rhomboidal. This may help in reducing any color point shifting in the light emitted by (LEDs of the) the lighting device due to any cross-talk between the LEDs on different elongated lighting elements due to them being arranged relatively close to each other and light emitted from a first one of the elongated lighting elements being absorbed by wavelength converting material comprised in a second one of the elongated lighting elements.
  • a cross section of the at least one elongated reflector in a plane perpendicular to the longitudinal axis thereof being circular, oval, or rhomboidal, it may be facilitated that light impinging on the first reflective surface and/or the second reflective surface of the at least one elongated reflector is reflected at a variety of angles to the reflective surface.
  • At least one elongated reflector may extend along a longitudinal axis thereof.
  • the at least one elongated reflector may at least in part have a varying thickness along a direction perpendicular to the longitudinal axis of the at least one elongated reflector.
  • the thickness of at least one elongated reflector may be largest at a center portion of the elongated reflector and may decrease towards both of its ends (i.e. the elongated reflector may be tapered towards both of its ends).
  • the light distribution of the light emitted by the (LEDs of the) lighting device may be improved (e.g., so as to increase the amount of light emitted from a top and/or bottom of the lighting device).
  • At least one elongated reflector may be provided with at least one of at least one refractive element or at least one diffractive element (i.e. at least one of at least one refractive element and/or at least one diffractive element) on at least one of the first reflective surface and the second reflective surface of the elongated reflector.
  • the at least one elongated reflector and the elongated lighting elements may be spaced apart.
  • At least one elongated reflector may be thermally connected with at least one of the elongated lighting elements between which the elongated reflector is interposed. This may facilitate for achieving a relatively high luminous flux in the light emitted by the (LEDs of the) lighting device, since by at least one elongated reflector being thermally connected with at least one of the elongated lighting elements between which the elongated reflector is interposed, the at least one elongated reflector may contribute to the cooling of the at least one of the elongated lighting elements, thereby facilitating or allowing for operation of the LEDs of the elongated carrier at a relatively high power (e.g., facilitating or allowing for applying higher currents to the LEDs).
  • Each or any (at least one) of the elongated lighting elements may comprise an encapsulant, which may at least partly enclose the plurality of LEDs of the elongated lighting element.
  • the encapsulant may comprise (the) wavelength converting material configured to convert at least a part of light input therein into light having a selected wavelength range.
  • the wavelength converting material may for example comprise photo-luminescent material.
  • the wavelength converting material may comprise light scattering particles or elements and/or quantum confinement structures.
  • the wavelength converting material may comprise a phosphor coating, a phosphor plate, a Lumiramic plate and/or phosphor conversion crystals.
  • the wavelength converting material may for example be arranged so as to have a selected concentration, type and/or amount of phosphor (and/or another type of light conversion or wavelength conversion material).
  • a phosphor coating and/or a coating of another type of wavelength converting material
  • Wavelength converting material on different elongated lighting elements may be the same or different, and may differ for example with respect to concentration, type and/or amount of phosphor (and/or another type of wavelength converting material).
  • the elongated carrier of each or any elongated lighting element may be configured to provide power to the plurality of LEDs of the elongated lighting element.
  • each or any of the LEDs may comprise inorganic LED(s) and/or organic LED(s) (OLEDs).
  • each or any of the elongated lighting elements could comprise, in alternative or in addition to LEDs, another or other types of light sources, such as another or other types of solid state light emitters.
  • Solid state light emitters are relatively cost efficient light sources since they in general are relatively inexpensive and have a relatively high optical efficiency and a relatively long lifetime.
  • the term“light source” should be understood to mean substantially any device or element that is capable of emitting radiation in any region or combination of regions of the electromagnetic spectrum, for example the visible region, the infrared region, and/or the ultraviolet region, when activated e.g.
  • a light source can have monochromatic, quasi-monochromatic, polychromatic or broadband spectral emission characteristics.
  • Examples of light sources include semiconductor, organic, or polymer/polymeric LEDs, violet LEDs, blue LEDs, optically pumped phosphor coated LEDs, optically pumped nano-crystal LEDs or any other similar devices as would be readily understood by a person skilled in the art.
  • the term lightsource can, according to one or more embodiments of the present invention, mean a combination of the specific light source(s) which emit the radiation in combination with a housing or package within which the specific light source(s) is positioned or arranged.
  • the term light source can encompass a bare LED die arranged in a housing, which may be referred to as a LED package.
  • the light source may comprise a Chip Scale Package (CSP) LED, which may comprise a LED die directly attached to a substrate such as a Printed Circuit Board (PCB), and not via a sub-mount.
  • CSP Chip Scale Package
  • PCB Printed Circuit Board
  • Fig. 1 is a schematic view of a lighting device according to an embodiment of the present invention.
  • Figs. 2 to 4 are schematic cross-sectional views of two elongated carriers and an elongated reflector in accordance with embodiments of the present invention.
  • Figs. 5 to 8 are schematic cross-sectional views of elongated carriers and elongated reflectors in accordance with embodiments of the present invention.
  • Figs. 9 and 10 are schematic side views of an elongated carrier and an elongated reflector in accordance with embodiments of the present invention.
  • Figs. 11 and 12 are schematic side views of an elongated reflector in accordance with embodiments of the present invention.
  • Fig. 13 is a schematic side view of an elongated carrier and an elongated reflector in accordance with an embodiment of the present invention.
  • FIG 1 is a schematic view of a lighting device 1 according to an embodiment of the present invention.
  • the lighting device 1 comprises two elongated lighting elements 2, 3.
  • Each of the elongated lighting elements comprises an elongated carrier (not shown in Figure 1) and a plurality of light sources, which in the following will be referred to as light-emitting diodes (LEDs), wherein the elongated carrier is arranged to support the plurality of LEDs (not shown in Figure 1) on at least one surface of the elongated carrier.
  • LEDs light-emitting diodes
  • Each elongated lighting element has at least one light-emitting side.
  • At least one of the elongated lighting elements 2, 3 comprises wavelength converting material configured to convert at least a part of light input therein into light having a selected wavelength range. Possibly, both of the elongated lighting elements 2, 3 could comprise wavelength converting material configured to convert at least a part of light input therein into light having a selected wavelength range.
  • the wavelength converting material of the elongated lighting element 2 may be different from the wavelength converting material of the elongated lighting element 3, for example with respect to type, concentration, thickness, etc.
  • the wavelength converting material may for example comprise photo-luminescent material.
  • the lighting device 1 comprises an elongated reflector 8.
  • the elongated reflector 8 has at least a first reflective surface and a second reflective surface.
  • the elongated reflector 8 is interposed between and arranged in relation to the two elongated lighting elements 2, 3 such that the first reflective surface of the elongated reflector 8 is facing in a direction towards a light-emitting side of one of the two elongated lighting elements 2, 3 (e.g., the elongated lighting element 2) and the second reflective surface of the elongated reflector 8 is facing in a direction towards a light-emitting side of the other one of the two elongated lighting elements 2,3 (e.g., the elongated lighting element 3).
  • At least one of shape, size or orientation of the reflector 8 in relation to the elongated lighting elements 2, 3 is such that the first reflective surface of the elongated reflector 8 is at most able to reflect the part or portion of the light that is emitted from the one of the elongated lighting elements 2, 3 towards which the first reflective surface is facing and that is directed towards the one of the elongated lighting elements 2, 3 towards which the second reflective surface of the elongated reflector 8 is facing, so as to reduce any absorption of light emitted from the one of the elongated lighting elements 2,3 towards which the first reflective surface is facing in any wavelength converting material comprised in the one of the elongated lighting elements 2, 3 towards which the second reflective surface is facing.
  • At least one of shape, size or orientation of the reflector 8 in relation to the elongated lighting elements 2, 3 is further such that and the second reflective surface of the elongated reflector 8 is at most able to reflect the part or portion of the light that is emitted from the one of the elongated lighting elements 2, 3 towards which the second reflective surface is facing and that is directed towards the one of the elongated lighting elements 2, 3 towards which the first reflective surface of the elongated reflector 8 is facing, so as to reduce any absorption of light emitted from the one of the elongated lighting elements 2, 3 towards which the second reflective surface is facing in any wavelength converting material comprised in the one of the elongated lighting elements 2, 3 towards which the first reflective surface is facing.
  • the elongated lighting elements 2, 3 and the elongated reflector 8 may have shapes of strips or bands or the like.
  • Each of the elongated lighting elements 2, 3 may have a width Wl, and the elongated reflector 8 may have a width W2.
  • W2 width
  • W2 width
  • the elongated reflector 8 being interposed between the elongated lighting elements 2, 3, with the first reflective surface of the elongated reflector 8 facing in a direction towards a light-emitting side of one of the two elongated lighting elements 2, 3 and the second reflective surface of the elongated reflector 8 is facing in a direction towards a light- emitting side of the other one of the two elongated lighting elements 2, 3, reduction or even avoidance of any cross-talk between the LEDs on the different elongated lighting elements 2, 3 due to them being arranged relatively close to each other and light emitted from a first one of the elongated lighting elements 2, 3 being absorbed by wavelength converting material comprised in a second one of the elongated lighting elements 2,3 may be facilitated.
  • the elongated reflector 8 in relation to the at least two elongated lighting elements 2, 3 being such that only at most the above-mentioned part or portion of the light is reflected, or blocked, and not other parts or portions of the light that is emitted from one of two elongated lighting elements 2, 3, a relatively high quality in the light distribution of the light emitted by the (LEDs of the) lighting device 1 may be achieved.
  • the lighting device 1 comprises a so called LED capsule, wherein each of the elongated lighting elements 2, 3 comprises (or is constituted by) a LED filament including a plurality of LEDs.
  • the illustrated lighting device 1 comprises a housing 20, which accommodates the elongated lighting elements 2, 3 and the elongated reflector 8, and contacts 21 for connection of the lighting device 1 to, e.g., a power source. It is however to be understood that the implementation of the lighting device 1 as illustrated in Figure 1 is according to an example, and that the lighting device 1 could be implemented in other ways.
  • lighting device 1 could comprise a so called“retrofit lamp” designed to have the appearance of a traditional incandescent light bulb and be mounted in a conventional socket, such as, for example, an Edison screw base, with the light emitting filament wire being replaced for example with one or more LEDs.
  • the light sources employed in the lighting device 1 must not necessarily comprise LEDs, but one or more other types of light sources, for example one or more types of solid state light emitters other than LEDs, may in alternative or in addition be employed in the lighting device 1.
  • the elongated lighting elements 2, 3 have been described as comprising LED filaments, this is not required and another or other implementations of the elongated lighting elements are possible.
  • the shape, size and/or orientation of the reflector 8 may be matched to the shapes, sizes and/or orientations, respectively, of the elongated lighting elements 2, 3, such that the first reflective surface of the elongated reflector 8 is able to reflect the part or portion of the light that is emitted from the one of the elongated lighting elements 2, 3 towards which the first reflective surface is facing and that is directed towards the one of the elongated lighting elements 2, 3 towards which the second reflective surface of the elongated reflector 8 is facing, and the second reflective surface of the elongated reflector 8 is able to reflect the part or portion of the light that is emitted from the one of the elongated lighting elements 2, 3 towards which the second reflective surface is facing and that is directed towards the one of the elongated lighting elements 2,3 towards which the first reflective surface of the elongated reflector 8 is facing.
  • the elongated reflector 8 may have a shape, size and/or orientation in relation to the elongated lighting elements 2, 3 so that the elongated reflector 8 is able to reflect, or block, the part or portion of the light that is emitted from one of two elongated lighting elements 2, 3 between which the elongated reflector 8 is interposed and that is directed towards the other one of the two elongated lighting elements 2, 3 such that that part or portion of the light is not able to reach the other one of the two elongated lighting elements 2, 3.
  • Figure 2 is a schematic cross- sectional view of two elongated lighting elements 2, 3 and an elongated reflector 8 in accordance with an embodiment of the present invention.
  • the elongated reflector 8 may extend along a longitudinal axis thereof, and each of the elongated lighting elements 2, 3 may extend along a longitudinal axis thereof.
  • the longitudinal axes of the elongated lighting elements 2, 3 may be parallel with each other, and the longitudinal axes of the elongated lighting elements 2, 3 may be parallel with the longitudinal axis of the elongated reflector 8.
  • Figure 2 is a cross- sectional view perpendicular to the longitudinal axes of the elongated lighting elements 2, 3 and the elongated reflector 8.
  • each of the longitudinal axes of the elongated lighting elements 2, 3 and the elongated reflector 8 may possibly be non coinciding with a longitudinal axis of the lighting device 1.
  • each of the longitudinal axes of the elongated lighting elements 2, 3 and the elongated reflector 8 may be offset from the longitudinal axis of the lighting device 1.
  • the cross section of the elongated reflector 8 in a plane perpendicular to the longitudinal axis thereof may be rectangular. However, this is according to an example, and according to other examples, the cross section of the elongated reflector 8 in a plane perpendicular to the longitudinal axis thereof may for example be circular, oval, square, or rhomboidal.
  • the width of the elongated reflector 8 may be matched to the width of the elongated lighting elements 2, 3, such that for the elongated reflector 8, the first reflective surface 14 of the elongated reflector 8 is able to reflect the part or portion of the light that is emitted from the one of the elongated lighting elements 2, 3 (e.g., the elongated lighting element 2) towards which the first reflective surface 14 is facing and that is directed towards the one of the elongated lighting elements 2,
  • the second reflective surface 15 of the elongated reflector 8 is able to reflect the part or portion of the light that is emitted from the one of the elongated lighting elements 2, 3 towards which the second reflective surface 15 is facing and that is directed towards the one of the elongated lighting elements 2,3 towards which the first reflective surface of the elongated reflector 8 is facing.
  • the width of the elongated reflector 8 in relation to the elongated lighting elements 2, 3 is such that only at most the above-mentioned part or portion of the light is reflected, or blocked, and no other parts or portions of the light that is emitted from one of two elongated lighting elements 2,3, a relatively high quality in the light distribution of the light emitted by the (LEDs of the) lighting device 1 may be achieved while at the same time further facilitating reducing or even avoiding any cross-talk between the LEDs on different elongated lighting elements 2, 3 due to them being arranged relatively close to each other and light emitted from a first one of the elongated lighting elements 2, 3 being absorbed by wavelength converting material comprised in a second one of the elongated lighting elements 2, 3.
  • the height (or another dimension) of the elongated reflector 8 may be matched to the height (or another dimension) of the elongated lighting elements 2, 3, such that for the elongated reflector 8, the first reflective surface 14 of the elongated reflector 8 is able to reflect the part or portion of the light that is emitted from the one of the elongated lighting elements 2, 3 (e.g., the elongated lighting element 2) towards which the first reflective surface 14 is facing and that is directed towards the one of the elongated lighting elements 2, 3 (e.g., the elongated lighting element 3) towards which the second reflective surface 15 of the elongated reflector 8 is facing, and the second reflective surface 15 of the elongated reflector 8 is able to reflect the part or portion of the light that is emitted from the one of the elongated lighting elements 2, 3 towards which the second reflective surface 15 is facing and that is directed towards the one of the elongated lighting elements 2, 3 towards which the first reflective surface of the elongated reflector 8 is
  • the elongated reflector 8 is interposed between and arranged in relation to the two elongated lighting elements 2, 3 such that the first reflective surface 14 of the elongated reflector 8 is facing in a direction towards a light-emitting side 16 of one of the two elongated lighting elements 2, 3 (e.g., the elongated lighting element 2) and the second reflective surface 15 of the elongated reflector 8 is facing in a direction towards a light-emitting side 17 of the other one of the two elongated lighting elements 2, 3 (e.g., the elongated lighting element 3).
  • Figure 3 is a schematic cross-sectional view of two elongated lighting elements 2, 3 and an elongated reflector 8 in accordance with an embodiment of the present invention.
  • the embodiment of the present invention illustrated in Figure 3 is similar to that illustrated in Figure 2, and the same reference numerals in Figures 2 and 3 denote the same or similar components having the same or similar function.
  • the first reflective surface 14 and the second reflective surface 15 are diffusively reflective. This may be achieved for example by providing the first reflective surface 14 and/or the second reflective surface 15 with a selected surface roughness. Light impinging on the diffusively reflective first and second reflective surfaces 14, 15 may be reflected at a variety of angles to the surfaces, as indicated in Figure 3 by the arrows.
  • Figure 4 is a schematic cross-sectional view of two elongated lighting elements 2, 3 and an elongated reflector 8 in accordance with an embodiment of the present invention.
  • the embodiment of the present invention illustrated in Figure 4 is similar to those illustrated in Figures 2 and 3, and the same reference numerals in Figures 2, 3 and 4 denote the same or similar components having the same or similar function.
  • the first reflective surface 14 and the second reflective surface 15 are specularly reflective.
  • the first reflective surface 14 of the elongated reflector 8 is arranged non-perpendicularly to a main direction of the part or portion of the light that is emitted from the elongated lighting element 2 towards which the first reflective surface 14 is facing.
  • the second reflective surface 15 of the elongated reflector 8 is arranged non-perpendicularly to a main direction of the part or portion of the light that is emitted from the elongated lighting element 3 towards which the first reflective surface 15 is facing, as illustrated in Figure 4.
  • light impinging on the specularly reflective first and second reflective surfaces 14, 15 may be reflected at a variety of angles to the surfaces, as indicated in Figure 3 by the arrows.
  • the lighting device may comprise a plurality of elongated lighting elements, of which the cross-sections thereof in a plane perpendicular to the elongated lighting elements may form a polygon like configuration.
  • the lighting device may further comprise a plurality of elongated reflectors which may be arranged in parallel with those elongated lighting elements and with each of those elongated reflectors positioned on a line between two adjacent lighting elements.
  • Figures 5 to 8 are schematic cross-sectional views of elongated lighting elements and elongated reflectors in accordance with embodiments of the present invention, for each of which there are more than two elongated reflectors and more than two elongated lighting elements.
  • each of the elongated reflectors in Figures 5 to 8 may extend along a longitudinal axis thereof, and each of the elongated lighting elements may extend along a longitudinal axis thereof.
  • the longitudinal axes of the elongated lighting elements may be parallel with each other, and the longitudinal axes of the elongated lighting elements may be parallel with the longitudinal axis of the elongated reflector.
  • Figures 5 to 8 are cross-sectional views perpendicular to the longitudinal axes of the elongated lighting elements and the elongated reflectors.
  • FIG. 6 there are four elongated lighting elements 2, 3, 4, 5 and four elongated reflectors 8, 9, 10, 11 arranged in a square configuration as seen in the plane in which the illustrated cross-sections of the elongated lighting elements 2, 3, 4, 5 and the elongated reflectors 8, 9, 10, 11 he.
  • the elongated reflectors 8, 9, 10, 11, 12, 13 may not be arranged on, or extend along, a longitudinal axis of the lighting device,
  • the longitudinal axis of the lighting device may extend through a point that is at the geometric center or centroid of the polygon like configuration formed by the cross-sections of the elongated lighting elements 2, 3, 4, 5, 6, 7 in a plane perpendicular to the elongated lighting elements 2, 3, 4, 5, 6, 7.
  • the embodiments of the present invention illustrated in Figures 5 to 8 are exemplifying.
  • the lighting device could comprise an elongated reflector positioned at a distance from a longitudinal axis of the lighting device and between two elongated lighting elements.
  • Figure 9 is a schematic side view of an elongated lighting element 2 and an elongated reflector 8 in accordance with an embodiment of the present invention.
  • the elongated lighting element 2 and the elongated reflector 8 illustrated in Figure 9 may for example be employed in one or more of the embodiments of the present invention illustrated in Figures 1-8.
  • the thickness of the elongated reflector 8 may be smaller than the thickness of an elongated lighting element 2 towards which at least one of the first and second reflective surfaces 14, 15 of the elongated reflector 8 is facing.
  • the elongated lighting element 2 and the elongated reflector 8 may for example have shapes of strips or bands or the like.
  • the elongated lighting element 2 may have a thickness Tl, and the elongated reflector 8 may have a thickness T2, with T2 ⁇ Tl. Preferably T2 « Tl.
  • T2 ⁇ Tl an improved spatial light distribution of the light emitted by (LEDs of the) the lighting device may be achieved.
  • the elongated lighting element 2 may have a length HI and the elongated reflector 8 may have a length H2, for which 0.5 ⁇ H2/H1 ⁇ 2 may hold.
  • Figure 10 is a schematic side view of an elongated lighting element 2 and an elongated reflector 8 in accordance with an embodiment of the present invention.
  • the elongated lighting element 2 and the elongated reflector 8 illustrated in Figure 10 may for example be employed in one or more of the embodiments of the present invention illustrated in Figures 1-9.
  • the elongated reflector 8 may extend along a longitudinal axis thereof, and may have a varying thickness along a direction perpendicular to the longitudinal axis of the elongated reflector 8. As illustrated in Figure 10, the thickness of the elongated reflector 8 may be largest at a center portion of the elongated reflector 8 and may decrease towards both of its ends. That is to say, the elongated reflector 8 may be tapered towards both of its ends, as illustrated in Figure 10.
  • the elongated reflector 8 having at least in part a varying thickness along a direction perpendicular to the longitudinal axis of the elongated reflector 8, the light distribution of the light emitted by the (LEDs of the) lighting device may be improved, e.g., so as to increase the amount of light emitted from a top and/or bottom of the lighting device, as indicated in Figure 10 by the arrow.
  • FIG 11 is a schematic side view of an elongated reflector 8 in accordance with an embodiment of the present invention.
  • the elongated reflector 8 illustrated in Figure 11 is provided with refractive elements 22, or refractive structures 22, on the first reflective surface and the second reflective surface of the elongated reflector 8. Only some of the refractive elements or refractive structures 22 are indicated by reference numerals in Figure 11.
  • Figure 12 is a schematic side view of an elongated reflector 8 in accordance with an embodiment of the present invention.
  • the elongated reflector 8 illustrated in Figure 12 is provided with diffractive elements 23, or diffractive structures 23, on the first reflective surface and the second reflective surface of the elongated reflector 8. Only some of the diffractive elements or diffractive structures 22 are indicated by reference numerals in Figure 12.
  • the elongated reflector 8 may be provided with one or more refractive elements and one or more diffractive elements on at least one of the first reflective surface and the second reflective surface of the elongated reflector 8.
  • Figure 13 is a schematic side view of an elongated lighting element 2 and an elongated reflector 8 in accordance with an embodiment of the present invention.
  • the elongated lighting element 2 and the elongated reflector 8 illustrated in Figure 13 may for example be employed in one or more of the embodiments of the present invention illustrated in Figures 1-12.
  • the elongated reflector 8 is thermally connected with the elongated lighting element 2, e.g., by means of one or more thermally conductive parts 24 interconnecting the elongated reflector 8 and the elongated lighting element 2, as illustrated in Figure 13.
  • the elongated lighting element 2 is one of at least two elongated lighting elements between which the elongated reflector 8 may be interposed.
  • a lighting device comprises at least two elongated lighting elements.
  • Each elongated lighting element comprises an elongated carrier and a plurality of LEDs, wherein the elongated carrier is arranged to support the plurality of LEDs on at least one surface of the elongated carrier.
  • Each elongated lighting element has at least one light-emitting side.
  • At least one of the elongated lighting elements comprises wavelength converting material configured to convert at least a part of light input therein into light having a selected wavelength range.
  • the lighting device comprises at least one elongated reflector.
  • Each elongated reflector has at least a first reflective surface and a second reflective surface.
  • Each elongated reflector is interposed between and arranged in relation to at least two of the elongated lighting elements such that the first reflective surface of the elongated reflector is facing in a direction towards a light- emitting side of one of the two elongated lighting elements and the second reflective surface of the elongated reflector is facing in a direction towards a light-emitting side of the other one of the two elongated lighting elements.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

La présente invention concerne un dispositif d'éclairage (1). Le dispositif d'éclairage (1) comprend au moins deux éléments d'éclairage allongés (2, 3), chaque élément d'éclairage allongé comprenant un support allongé et une pluralité de diodes électroluminescentes, DEL, le support allongé étant conçu pour soutenir la pluralité de DEL sur au moins une surface du support allongé. Chaque élément d'éclairage allongé (2, 3) présente au moins un côté électroluminescent. Au moins l'un des éléments d'éclairage allongés (2, 3) comprend un matériau de conversion de longueur d'onde conçu pour convertir au moins une partie de la lumière introduite à l'intérieur de ce dernier en une lumière présentant une plage de longueur d'onde sélectionnée. Le dispositif d'éclairage (1) comprend au moins un réflecteur allongé (8). Chaque réflecteur allongé (8) présente au moins une première surface réfléchissante et une seconde surface réfléchissante. Chaque réflecteur allongé (8) est interposé entre au moins deux des éléments d'éclairage allongés (2, 3) et est agencé par rapport à au moins deux des éléments d'éclairage allongés (2, 3), de sorte que la première surface réfléchissante du réflecteur allongé (8) est orientée dans une direction vers un côté électroluminescent de l'un des deux éléments d'éclairage allongés (2-7) et la seconde surface réfléchissante du réflecteur allongé (8) est orientée dans une direction vers un côté électroluminescent de l'autre des deux éléments d'éclairage allongés (2, 3).
PCT/EP2020/054815 2019-02-28 2020-02-25 Dispositif d'éclairage WO2020173895A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP19159978.6 2019-02-28
EP19159978 2019-02-28

Publications (1)

Publication Number Publication Date
WO2020173895A1 true WO2020173895A1 (fr) 2020-09-03

Family

ID=65686685

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2020/054815 WO2020173895A1 (fr) 2019-02-28 2020-02-25 Dispositif d'éclairage

Country Status (1)

Country Link
WO (1) WO2020173895A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130286664A1 (en) * 2012-04-26 2013-10-31 Epistar Corporation Led light bulb
EP2827046A1 (fr) * 2012-03-12 2015-01-21 Zhejiang Ledison Optoelectronics Co., Ltd. Colonne d'éclairage à del et lampe à del l'utilisant
WO2016145448A1 (fr) 2015-03-12 2016-09-15 GE Lighting Solutions, LLC Lampe à del à surface miroir interne
WO2018041826A1 (fr) * 2016-09-01 2018-03-08 Philips Lighting Holding B.V. Dispositif électroluminescent
US20180328543A1 (en) * 2017-05-10 2018-11-15 Cree, Inc. Solid-state lamp with led filament

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2827046A1 (fr) * 2012-03-12 2015-01-21 Zhejiang Ledison Optoelectronics Co., Ltd. Colonne d'éclairage à del et lampe à del l'utilisant
US20130286664A1 (en) * 2012-04-26 2013-10-31 Epistar Corporation Led light bulb
WO2016145448A1 (fr) 2015-03-12 2016-09-15 GE Lighting Solutions, LLC Lampe à del à surface miroir interne
WO2018041826A1 (fr) * 2016-09-01 2018-03-08 Philips Lighting Holding B.V. Dispositif électroluminescent
US20180328543A1 (en) * 2017-05-10 2018-11-15 Cree, Inc. Solid-state lamp with led filament

Similar Documents

Publication Publication Date Title
US9512970B2 (en) Photoluminescence wavelength conversion components
US9217544B2 (en) LED based pedestal-type lighting structure
US9217553B2 (en) LED lighting systems including luminescent layers on remote reflectors
JP5511837B2 (ja) 細長い中空の波長変換チューブを含む半導体発光装置およびその組立方法
US9275979B2 (en) Enhanced color rendering index emitter through phosphor separation
JP5566564B2 (ja) Ｌｅｄ利用型電球
US20220403987A1 (en) A lighting emitting device
US11466847B2 (en) Led filament arrangement with heat sink structure
US20160072024A1 (en) Lighting apparatus
JP2012519350A (ja) Ｌｅｄに基づくランプ及びそのランプのための熱管理システム
US11739884B2 (en) LED filaments with light-reflective particles for providing sparkle
WO2020229462A1 (fr) Agencement de filament à del
US11913608B2 (en) LED filament arrangement
US11739886B2 (en) LED filament arrangement
WO2020173895A1 (fr) Dispositif d'éclairage
WO2023174818A1 (fr) Filament à del
WO2023213575A1 (fr) Filament à del
WO2020161070A1 (fr) Lampe à filament de del
JP2019062173A (ja) 照明装置、及び、発光装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20705379

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20705379

Country of ref document: EP

Kind code of ref document: A1