EP2215399A1 - Led lighting device having a conversion reflector - Google Patents
Led lighting device having a conversion reflectorInfo
- Publication number
- EP2215399A1 EP2215399A1 EP08855239A EP08855239A EP2215399A1 EP 2215399 A1 EP2215399 A1 EP 2215399A1 EP 08855239 A EP08855239 A EP 08855239A EP 08855239 A EP08855239 A EP 08855239A EP 2215399 A1 EP2215399 A1 EP 2215399A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- light
- reflector
- lighting device
- conversion
- led lighting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- 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
- F21V7/0008—Reflectors for light sources providing for indirect lighting
-
- 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
- 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
-
- 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
- F21K9/64—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
-
- 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
- F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
- F21V13/02—Combinations of only two kinds of elements
- F21V13/08—Combinations of only two kinds of elements the elements being filters or photoluminescent elements and reflectors
-
- 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
- F21V3/00—Globes; Bowls; Cover glasses
- F21V3/04—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings
- F21V3/06—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by the material
- F21V3/061—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by the material the material being glass
-
- 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
- F21V5/00—Refractors for light sources
- F21V5/10—Refractors for light sources comprising photoluminescent material
-
- 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
- F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
- F21V7/24—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by the material
- F21V7/26—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by the material the material comprising photoluminescent substances
-
- 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
- F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
- F21V7/28—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by coatings
- F21V7/30—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by coatings the coatings comprising photoluminescent substances
-
- 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
- F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
- F21V9/08—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters for producing coloured light, e.g. monochromatic; for reducing intensity of light
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F13/00—Illuminated signs; Luminous advertising
- G09F13/04—Signs, boards or panels, illuminated from behind the insignia
- G09F13/14—Arrangements of reflectors therein
-
- 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
- F21V11/00—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00
- F21V11/16—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 using sheets without apertures, e.g. fixed
-
- 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
- F21V3/00—Globes; Bowls; Cover glasses
- F21V3/04—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings
- F21V3/06—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by the material
- F21V3/062—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by the material the material being plastics
-
- 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
- F21V5/00—Refractors for light sources
- F21V5/04—Refractors for light sources of lens shape
- F21V5/045—Refractors for light sources of lens shape the lens having discontinuous faces, e.g. Fresnel lenses
-
- 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
- F21V7/0025—Combination of two or more reflectors for a single light source
- F21V7/0033—Combination of two or more reflectors for a single light source with successive reflections from one reflector to the next or following
-
- 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
- F21V7/045—Optical design with spherical surface
-
- 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
- the invention relates to an LED lighting device which has at least one light-emitting diode and a reflector.
- wavelength conversion of blue LED light to white light has been achieved by employing a wavelength converting material (fluorescent dye, phosphor, eg, cerium-doped yttrium aluminum garnet powder) which is brought close to the blue light emitting diode (LED) , z.
- a wavelength converting material fluorescent dye, phosphor, eg, cerium-doped yttrium aluminum garnet powder
- LED blue light emitting diode
- LED chip phosphor-containing embedding material
- the illumination device has at least one light-emitting diode and at least one reflector, the reflector being provided at least a part of a light emitted by the light emitting diode wavelength converts and - typically diffuse - emits ("conversion reflector").
- the phosphor Since the phosphor is no longer installed in the single LED or the LED chip, and the conversion volume is no longer in direct contact with the raw LED, but from the highly thermally stressed close environment of the LEDs or the LED chips is removed, there is a considerable gain in the conversion efficiency. This also makes it possible to use age-sensitive or low-power-density phosphors such as Mn 2+ , Mn 4+ , Eu 3+ or Tb 3+ doped phosphors, which are not suitable for use in an LED chip.
- age-sensitive or low-power-density phosphors such as Mn 2+ , Mn 4+ , Eu 3+ or Tb 3+ doped phosphors, which are not suitable for use in an LED chip.
- the base material of the conversion reflector consists of a good heat-conducting material, eg. B. of metal or thermally conductive ceramic.
- the thermal conductivity is more than 15 W / (m-K), especially more than 100 W / (m-K).
- a reflector region of the at least one conversion reflector preferably has at least one wavelength conversion material (phosphor) for the light emitted by the at least one light-emitting diode.
- the converted light is typically emitted isotropically on average.
- the conversion reflector also diffuses the part of the light emitted by the light-emitting diode or reflects it diffusely, which is not wavelength-converted (if present). As a result, the conversion reflector acts as a diffuser or conversion diffuser, but without loss of efficiency.
- the conversion reflector may be constructed such that it has a conventional reflective, z. B. reflective, surface ("reflection surface"), on which a phosphor layer of appropriate concentration and thickness
- Conversion layer is applied. The only reflected part of the blue primary light then passes on the reflection surface in a configuration without conversion through the conversion layer, is reflected there and subsequently passes back through the conversion layer without conversion.
- the conversion layer can be constructed, for example, from an embedding material or matrix material, such as silicone resin, interspersed by the phosphor and any scattering material. The converted part of the light is typically emitted isotropically diffusely.
- the encapsulant material may also have an afterglow to reduce a light ripple having a higher relaxation time than the wavelength conversion material; a persistence time (half-life) of approx. 5-15 ms is preferred.
- the non-wavelength converted light (if any) is emitted diffusely reflected or reflected at the reflector.
- This can be done for example by a suitable embodiment of the reflection surface or by means of a light-scattering property of the conversion layer, typically by means of a light-emitting scattering property of embedded in a matrix (eg silicone) luminescent phosphor particles or inert particles (eg, metal oxides such as SiO 2 , Al 2 O 3 , TiO 2 or ZrO 2 ).
- a matrix eg silicone
- luminescent phosphor particles or inert particles eg, metal oxides such as SiO 2 , Al 2 O 3 , TiO 2 or ZrO 2 .
- Typical embedding or matrix materials which do not even or only insignificantly scatter, include silicone, epoxy resin or the like. However, it is also possible to use a scattering embedding or matrix material, eg. As a non-transparent plastic such as sintered Teflon.
- the length of the light path through the conversion layer can be increased by the preferably present reflection surface, whereby its thickness can be reduced for sufficient, preferably complete, scattering of the primary light in the conversion layer, which saves expensive phosphor .
- Typical layer thicknesses for such a construction are in the range of 2-50 ⁇ m, preferably 10-50 ⁇ m, particularly preferably around 30 ⁇ m, the exact value being strongly dependent on the phosphor concentration, the absorption coefficient of the phosphor, the quantum efficiency of the phosphor, a desired Color, the grain size of the phosphor and a scattering property of the embedding material depends ..
- the thickness of the conversion layer can be so strong that no reflecting reflection surface is required more for a sufficient, in particular complete, scattering without wavelength conversion.
- Typical layer thicknesses for such an "opaque" conversion layer in which the optical properties of the surface of the conversion reflector body no longer play a significant role are in the range of 10-200 .mu.m, preferably 30-100 .mu.m, the exact value of the Leuchtstoffkonzent- ration, the absorption coefficient of the phosphor, the quantum efficiency of the phosphor, a desired color, the grain size of the phosphor and a scattering property of the embedding material.
- a thick conversion layer generally has the advantage of a large tolerance to variations in thickness and is therefore easier to produce reproducible.
- the phosphor and thus the conversion reflector or its reflector region generally have a "non-white” body color. Even when using LEDs that emit in the ultraviolet range, a "non-white” body color is possible, but not mandatory.
- the light emitted by the at least one conversion reflector produces a white mixed light.
- a lighting device is preferred in which the at least one light-emitting diode is a blue-emitting light-emitting diode and the wavelength conversion material converts blue light into yellow light.
- the wavelength conversion material converts blue light into yellow light.
- This typically yields a "cold white” with a typical color temperature of about 6500K.
- two wavelength conversion materials are preferred which reflect the blue light of the LED (s) in convert yellow light or red light.
- the blue content for "cold white” is typically 15% - 20%, that for "warm white” is about 10% - 15%.
- the at least one light-emitting diode is a UV light-emitting diode and wavelength conversion materials convert UV light into red, green or blue light, or a similarly acting color combination. Then it is highly preferred when the UV light is completely converted to visible mixed light.
- the reflector region or the reflector regions of the conversion reflector which is typically 'non-white', is not visible from the outside, at least when viewed from above (ie from the piston side).
- the reflector portion of the conversion reflector is visible only when viewed from the side, but it is preferred if it is not visible from the outside.
- the conversion reflector is mounted in the emission direction of the at least one light emitting diode on a substrate carrying at least one light emitting diode (LED module).
- the illumination device has an LED module with a plurality of light-emitting diodes mounted on a common substrate.
- the conversion reflector tapers in the direction of the LED module.
- the conversion reflector projects laterally beyond the light-emitting diode (s).
- the lighting device also has another reflector (without wavelength conversion property) on which the mixed light (white or other color) emitted by the conversion reflector falls.
- another reflector without wavelength conversion property
- another reflector containing a phosphor z. B. a Wellenbalnumwandlungs- material, in particular a phosphor coating.
- a phosphor offers especially in phosphor mixtures, eg. B. in warm white or - even more clearly - in UV conversion, benefits.
- the phosphors can then be arranged separately from each other, which reduces mutual absorption and thus further increases the efficiency. When used with UV LEDs, even a body color does not occur because at least the blue emitting phosphor does not have body color (i.e., this phosphor is white).
- the further reflector is arranged so that the light emitted by the light emitting diode or the light module does not fall directly on him, but only on the conversion reflector. It is advantageous for space-saving arrangement, when the further reflector is arranged laterally of the light emitting diode.
- the illumination device has at least one aperture for blocking the light emitted by the at least one light-emitting diode that does not fall on the conversion reflector .
- This diaphragm (s) or another diaphragm can also be provided for visual protection of the reflector region of the conversion reflector radiating the mixed light.
- a lighting device which is a
- Lighting device having a coupling means which couples light emitted by the conversion reflector and leads to a luminous area.
- the coupling means may for example be a light guide, z.
- the luminous area preferably has an afterglow, which also continues to illuminate after the LED lamp has been switched off. Alternatively, it may have a mask for masking a luminous area that illuminates over a wide area.
- the afterglow substance has a considerably higher relaxation time than the wavelength conversion material.
- the luminous area is arranged on a side facing away from the LEDs of the conversion reflector, since such a luminous area of the LED lamp needs to be reduced only slightly.
- the conversion reflector and / or the further reflector are faceted.
- Light-emitting diodes advantageous if the conversion reflector has at least as many facets as light-emitting diodes and light a light-emitting diode is reflected by means of at least one respectively associated facet.
- the lighting device further comprises a bulb which is permeable to the light reflected by the further reflector, in particular a glass bulb.
- the piston is at least partially frosted (milky), since a more uniform angular distribution of the light emission is thus achieved.
- the further reflector (outside or inside) is formed on the piston.
- the further reflector is designed as a diffusely scattering reflector, for. B. by training its reflection range as a frosted reflection range.
- the conversion reflector is not in direct contact with the LED substrate (LED module, LED submount, etc.), it may be advantageous if the illumination device has an at least partially translucent cover plate, in particular of glass, to which the conversion reflector is attached , z. B. glued or in one piece.
- the LED lamp is designed as a retrofit lamp, since such a retrofit lamp can have a high luminance and an incandescent lamp very similar shape and / or radiation properties;
- the retrofit lamp can be designed in such a way that the primary light sources (LEDs or LED chips) are not directly visible. For a viewer, only the outer bulb is visible.
- FIG. 4 shows a sectional side view of components of a further embodiment of an LED lamp
- FIG. 5 shows a sectional side view of yet another embodiment of an LED lamp
- FIG. 6 shows a sectional side view of yet another embodiment of an LED lamp
- FIG. 7 shows a sectional side view of a section of the LED lamp according to FIG. 6;
- FIG. 8 shows a plan view of a detail of the LED lamp according to FIG. 6;
- FIG. 9 shows a plan view of a further embodiment of an LED module.
- LED submount an LED module (LED submount) 1, in which three blue LED chips 2 are arranged on a common substrate 3.
- FIG. 2 shows an underside 4 a of a conversion reflector 4 made of plastic serving as the base material, serving as a reflector region.
- the foot 5 of the conversion reflector 4 fits into the middle gene gap between the LED chips 2 of FIG 1 and can be placed there on the LED module 1.
- the conversion reflector 4 widens upwards from the foot 5 (in the z-direction), forming partial facets 6a, 6b, 6c.
- the bottom side 4a is designed to be reflective at least with respect to the light emitted by the LEDs.
- the conversion reflector 4 further comprises at least one wavelength conversion material (phosphor), which converts the blue light of the LED chips into yellow light.
- the lateral extent (in the xy plane) is greater than that of the three LED chips.
- FIG. 3 shows an LED lamp 7 with the LED module 1 from FIG. 1 and the conversion reflector 4 from FIG. 2 mounted thereon.
- the conversion reflector 4 covers the LED module 1 laterally (in the xy plane), thus protruding laterally beyond it out.
- the further reflector 9 is arranged at such a location on the piston 7, that it is not in the direct emission range of the LED module 1, so does not directly receive its emitted blue light.
- the light emitted by the LED module 1 is radiated mainly to the underside 4 a of the conversion reflector 4 serving as a reflector region, as indicated by the solid arrows. More specifically, light of each of the LED chips is irradiated to the facing facets 6a, 6b and 6c, respectively. There, the blue light is partially converted into yellow light.
- the underside 4a or the facets 6a, 6b, 6c of the conversion reflector 4 is or are shaped such that both unconverted blue light and also converted yellow light are directed as white mixed light onto the further reflector 9 (FIG. scored arrows), which then reflects the mixed light in the otherwise translucent piston 8.
- the further, second reflector 9 can be designed both mirrored and diffuse reflective.
- the further reflector 9 may also be faceted.
- the emission characteristic of such a lamp 7 can be adapted to the emission characteristic of any desired lamp by suitably faceting the conversion reflector 4 and / or the further reflector 9 and / or by so-called "frosting" of the glass bulb 8.
- a lamp 7 is suitable as a retro fit lamp; the LED chips as well as the wavelength conversion material (phosphor) or the conversion-reflecting underside 4a are not visible in plan view.
- the lamp shown in FIG 3 is designed as a retrofit lamp. It has, even if not shown for clarity, suitable power connections and drivers for the LED chips 2, possibly also heat dissipation.
- the lamp 7 may have an Edison base or a bayonet base.
- the contour of the piston 8 is similar to that of an incandescent lamp.
- FIG 4 shows a detail of another LED lamp 10, in which now in contrast to the embodiment of FIG 3 at the top of the conversion reflector 4 and at the top of the other reflector 9 each have a circumferential aperture 11 is present.
- the diaphragm 11 that part of the blue light is blocked by the LED module 1, which does not hit the conversion reflector 4. This prevents the white mixed light reflected by the further reflector 9 from undesirable at least under certain viewing angles. additional blue light component receives.
- the diaphragm 11 serves as a screen for serving as a reflector region of the conversion reflector 4 bottom 4a.
- FIG. 5 shows a further LED lamp 12 in which the conversion reflector 13 no longer touches down on the LED module 1, but is fastened with its flat upper side to a translucent cover plate 14, for example. B. by gluing, molding or in one-piece design. As a result, a stronger thermal decoupling of the reflector 4 is achieved by the LED module 1.
- LED lamp 12 now has no completely round piston as a cover more, but the cover plate 14 serves as the top cover.
- the cover plate 14 may also be designed as an optical element, for. As a Fresnel lens or as a microlens array.
- FIG. 6 shows yet another LED lamp 15, in which compared to the embodiment of FIG 5, a lighting device 16 having a coupling means 17 in the form of a glass fiber which couples light emitted from the conversion reflector 4 and leads to a light emitting area 18.
- the luminous area 18 has an afterglow, which also continues to illuminate after the LED lamp has been switched off and is substantially visible from the outside, radiating upward.
- the luminous area 18 is here arranged on a side facing away from the LED module 1 side of the conversion reflector 4, since such a luminous area of the LED lamp needs to be reduced only slightly and the luminous area 18 is clearly visible.
- the afterglow can be in the form of a company logo.
- the coupling means 17 projects laterally annularly over the conversion reflector 13 by a distance d and couples the light incident on this annular area with thickness d into the illuminating area 18.
- the luminous area 18 generally emits the injected light again, here with the help of a Nachleuchtstoffs upwards.
- light can also be radiated laterally, for example, even afterglow or immediately, and is therefore often visible in a lateral view even when the lamp is switched on, since LED lamps often have a narrower illumination angle range.
- Coupling means 17 and light area 18 may be made in one piece, for. B. as a plate, in which case z. B. the upper surface of the plate may be coated with nocturnal phosphor.
- the lighting device 16 shows the lighting device 16 from above, the lighting area 18 here a symbol 19, z.
- the lighting area 18 here a symbol 19, z.
- FIG. 9 shows, in a view analogous to FIG. 1, a further embodiment of an LED module 20 in which the LEDs or LED chips 2 are now applied from an annular substrate 21.
- the conversion reflector can then be passed through the inner opening and z. B. be mounted on the base, which allows a further thermal decoupling of the conversion material from the heat sources.
- the present invention is not limited to the embodiments shown. So the LEDs do not need to radiate blue.
- the LEDs can be arranged differently. It can be used more than one conversion reflector, as well as more than one other reflector. It may be introduced in the beam path further light-guiding elements, for. As optical lenses or other reflectors or reflector groups.
- the shape of the conversion reflector may be different, for. B. axially symmetrical already at a small distance from the foot, or completely axially symmetrical.
- other wavelength conversion materials are also radiating with a different color
- Light emitting diodes used in particular, if by the wavelength conversion materials in general that of the LED or the LEDs emitted colored light is converted so that a total white or similar mixed light is emitted (eg UV LED and various phosphors as a phosphor at the conversion reflector).
- the LED lamp does not need to have a piston.
- the piston also need not be made of glass, but may have any other suitable translucent material, for. B. temperature-resistant plastic.
- the lamp shape is not limited.
- the lighting device does not need directional, z. As above all to radiate, but may for example also have an isotropic emission characteristic. As a result, the illuminated area is also clearly visible when viewed from the side when the LED lamp is switched on, if the LED lamp emits in a narrow solid angle (eg upwards). Because viewed at an angle outside of this solid angle (eg, from the side), the viewer sees no light from the headlight. However, the lighting device can be seen if the light emits in a larger solid angle.
- An afterglow substance is not necessary in this case. In general, the afterglow is not mandatory, but may be advantageous depending on the type of use. If the coupling means in the beam path between LED chip (s) and conversion reflector is arranged, the
- Illuminate light fixture blue In addition, at the light area Nachleuchtstoff itself does not need to be present in a desired form; Alternatively, the lighting device could be painted black with recesses, z. For example, with recesses in the form of a logo, from which light emerges.
- the further reflector 9, the reflector 9 may also be coated with phosphor.
- the mutual absorptions present in a phosphor mixture can be reduced.
- phosphors with a white body color are also used, which Special offer layering of the reflector 9.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Optics & Photonics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Led Device Packages (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007056874A DE102007056874A1 (en) | 2007-11-26 | 2007-11-26 | LED lighting device with conversion reflector |
PCT/EP2008/010026 WO2009068262A1 (en) | 2007-11-26 | 2008-11-26 | Led lighting device having a conversion reflector |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2215399A1 true EP2215399A1 (en) | 2010-08-11 |
Family
ID=40403999
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08855239A Withdrawn EP2215399A1 (en) | 2007-11-26 | 2008-11-26 | Led lighting device having a conversion reflector |
Country Status (7)
Country | Link |
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US (1) | US20100301353A1 (en) |
EP (1) | EP2215399A1 (en) |
JP (1) | JP2011504297A (en) |
CN (1) | CN101874176A (en) |
CA (1) | CA2704991A1 (en) |
DE (1) | DE102007056874A1 (en) |
WO (1) | WO2009068262A1 (en) |
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2007
- 2007-11-26 DE DE102007056874A patent/DE102007056874A1/en not_active Withdrawn
-
2008
- 2008-11-26 CA CA2704991A patent/CA2704991A1/en not_active Abandoned
- 2008-11-26 CN CN200880117874A patent/CN101874176A/en active Pending
- 2008-11-26 US US12/744,701 patent/US20100301353A1/en not_active Abandoned
- 2008-11-26 JP JP2010534419A patent/JP2011504297A/en active Pending
- 2008-11-26 EP EP08855239A patent/EP2215399A1/en not_active Withdrawn
- 2008-11-26 WO PCT/EP2008/010026 patent/WO2009068262A1/en active Application Filing
Cited By (1)
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US8758995B2 (en) | 1995-04-11 | 2014-06-24 | Sequenom, Inc. | Solid phase sequencing of biopolymers |
Also Published As
Publication number | Publication date |
---|---|
CN101874176A (en) | 2010-10-27 |
US20100301353A1 (en) | 2010-12-02 |
CA2704991A1 (en) | 2009-06-04 |
WO2009068262A4 (en) | 2009-07-23 |
WO2009068262A1 (en) | 2009-06-04 |
JP2011504297A (en) | 2011-02-03 |
DE102007056874A1 (en) | 2009-05-28 |
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