EP2118562B1 - Led lamp with omnidirectional light radiation and optimized heat dissipation - Google Patents

Led lamp with omnidirectional light radiation and optimized heat dissipation Download PDF

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Publication number
EP2118562B1
EP2118562B1 EP07857088A EP07857088A EP2118562B1 EP 2118562 B1 EP2118562 B1 EP 2118562B1 EP 07857088 A EP07857088 A EP 07857088A EP 07857088 A EP07857088 A EP 07857088A EP 2118562 B1 EP2118562 B1 EP 2118562B1
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EP
European Patent Office
Prior art keywords
led
illuminant
supports
angled
angled support
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EP07857088A
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German (de)
French (fr)
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EP2118562A1 (en
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Christoph Kuegler
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    • 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
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/502—Cooling arrangements characterised by the adaptation for cooling of specific components
    • F21V29/503—Cooling arrangements characterised by the adaptation for cooling of specific components of light sources
    • 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
    • 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
    • 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
    • F21Y2107/00—Light sources with three-dimensionally disposed light-generating elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2107/00—Light sources with three-dimensionally disposed light-generating elements
    • F21Y2107/40—Light sources with three-dimensionally disposed light-generating elements on the sides of polyhedrons, e.g. cubes or pyramids
    • 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 light source (LED - light emitting diode), a lamp comprising such an LED light source and a method for producing such a light source.
  • LED light source LED - light emitting diode
  • Illuminants are the light-emitting objects of a luminaire. Examples of common bulbs are incandescent (also referred to as light bulbs), halogen bulbs or fluorescent lamps. Due to the progressive development in the field of LEDs, LEDs are becoming increasingly interesting as lighting devices for fields of application in which incandescent lamps, halogen incandescent lamps or fluorescent lamps are currently predominant.
  • An LED is a diode-based semiconductor device. When current flows through the diode in the forward direction, it emits light. By choosing the semiconductor material and the doping, the wavelength of the emitted light can be influenced.
  • LEDs that produce white light can be made by covering a blue LED with fluorescent dye.
  • a plurality of light-emitting diodes, which emit light in different colors, can be connected together so that white light results due to the color addition.
  • White LEDs are available as SMD components (surface mounted device), which can be soldered directly to an electrical circuit board using solderable connection surfaces.
  • SMD components surface mounted device
  • white LEDs already ready mounted on a circuit board for example, mounted on a square board measuring 25 ⁇ 25 mm 2 ).
  • a light source Important characteristics of a light source are its luminous efficacy in lumens per watt (lm / W) and its power consumption.
  • white LEDs typically have a light output of up to 50 lm / W and an absolute power consumption of 2.5 W per LED.
  • the luminous efficacy of white LEDs is thus higher than that of incandescent and halogen incandescent lamps (typically in the range of 10 lm / W to 20 lm / W), but below that of fluorescent lamps (up to 110 lm / W).
  • an LED bulb should deliver a comparable luminous flux.
  • a common 75W incandescent bulb for high voltage operation i.e., at 230V or 110V line voltage
  • 4 white LEDs with 50 lm / W and a power of 2.5 W per LED can be interconnected, resulting in a luminous flux of 500 Im.
  • LEDs Due to their design, LEDs have the disadvantage that individual LEDs, in contrast to incandescent lamps having a virtually omnidirectional emission characteristic, only achieve an emission angle range of typically 120 ° to a maximum of 180 °.
  • an elongated tubular light source which has as a light source a plurality of SMD LEDs. Chains of SMD LEDs are mounted on the surface of a hollow body.
  • a light source which has the shape of a conventional incandescent lamps.
  • several LEDs are mounted on a cube or octahedral carrier inside the bulb.
  • a disadvantage of such an arrangement is that the carrier does not ensure sufficient heat dissipation.
  • the LED lighting device according to the invention according to claim 1 comprises a plurality of carriers, which are advantageously similar.
  • the carriers are each angled.
  • the supports are angled metal sheets.
  • the carriers are arranged such that the angled carrier portions of the carrier are adjacent, so lie together.
  • the solid angles of the surfaces of the angled carrier sections correspond essentially to different Raurnwinkeln a polyhedron. It can be provided that not only the solid angles correspond to those of a polyhedron, but also that the angled support sections in the form and Arrangement to one another substantially correspond to the sides of a polyhedron.
  • the LED illuminant further comprises a plurality of (advantageously white) LED elements, for example white LED SMDs, which are arranged on the angled carrier sections.
  • a plurality of LED elements for example white LED SMDs, which are arranged on the angled carrier sections.
  • at least one LED element is arranged on each angled support section. The heat of the individual LED elements is in each case discharged from the angled support section over the remaining support.
  • An LED element in the sense of the application can be both a single LED and an LED with associated board.
  • angled carriers are provided for the individual LED elements, the heat of the individual LED elements, starting from the angled carrier section, can be dissipated via the remaining carrier in a sufficient manner. Due to the use of angled carrier, a further cooling surface is provided for each LED element next to the surface on which the LED element is arranged and which corresponds to the angled carrier section, which corresponds to the rest of the carrier. As a result, the surface available for heat dissipation is significantly increased.
  • an angled support has not necessarily been created by bending a straight output carrier. Such a carrier can also result by joining two carrier parts at an angle.
  • the LED illuminant is not necessarily made by assembling separate angled carriers. It can also be provided, for example be that first the support sections on which the LED elements are arranged or later arranged, are joined together and then the angled support sections are attached.
  • the inner angle between the angled support section and the remaining support corresponds to half of the outer angle between the adjoining angled support sections of these two supports.
  • two or more carriers are arranged parallel to a common axis.
  • a first group of carriers extends in one direction along the common axis
  • a second group of carriers extends in the direction opposite thereto along the common axis.
  • the angled support sections essentially correspond to different side surfaces of a polyhedron or parts of these side surfaces, so that the adjacent support sections can be arranged such that they form a polyhedron.
  • the LED illuminant has at least four LED elements. Even with a beam angle range of 120 ° per LED element, a nearly omnidirectional radiation characteristic can be achieved.
  • the polyhedron may be a platonic body in which the side surfaces are regular polygons that are congruent to each other, of which the same number coincide in each corner.
  • Tetrahedron (4 Pages), hexahedron (6 pages), octahedron (8 pages), dodecahedron (12 pages) and icosahedron (20 pages) each form a platonic solid.
  • the polyhedron is a tetrahedron and the LED illuminant comprises four angled support sections, the solid angles of the four angled support sections essentially corresponding to the four solid angles of the tetrahedron.
  • the four angled support sections may substantially correspond to the surfaces of a tetrahedron in shape and arrangement with respect to one another.
  • the carriers are arranged along a common axis, it is advantageous for the carriers to form a channel along this axis, for example by curving the carriers about the common axis. As a result, the heat can be dissipated via the insides of the carrier.
  • the carriers may advantageously be mounted on a bar press profile, for example on an aluminum bar press profile.
  • the heat is dissipated via the thermally well-conducting bar press profile.
  • the carriers have holes. Due to the thereby enlarged surface heat dissipation is further improved.
  • the LED lighting means each comprise a socket.
  • an electronic ballast (transformer) is advantageously provided in the LED lighting means.
  • the luminaire according to the invention according to claim 20 comprises an above-described LED lighting means.
  • the method according to the invention for producing an LED illuminant comprises a plurality of steps according to claim 22.
  • a first step a plurality of angled carriers are provided.
  • a plurality of LED elements are arranged on the angled carrier sections, the heat of the individual LED elements in each case being removed from the angled carrier section via the remaining carrier during operation of the LED illuminant.
  • the carriers are arranged such that the angled carrier sections are adjacent and the solid angles of the surfaces of the angled carrier sections substantially correspond to different solid angles of a polyhedron.
  • the following table shows the luminous efficiency and the total power loss of a white LED illuminant in the light color warm-white (about 3500 K) depending on the number of white LEDs used and the LED characteristics (power per LED in watts and luminous efficacy in lumens per A low luminous flux is in the range of 500 to 750 Im, a high luminous flux is from 1000 Im. Furthermore, it can be assumed that at a total power loss from 30 W, the bulb is very hot. At a total power loss over 40 W, the bulb becomes too hot, so it is destroyed.
  • White LEDs with a power loss of 2.5 W and a luminous efficacy of 50 lm / W are already available at the present time. It is expected that from 2008, white LEDs with a power dissipation of 5 W per LED and a luminous efficiency of 50 lm / W or alternatively with a power loss of 2.5 W and a luminous efficacy of 70 lm / W will be commercially available .
  • the LED illuminant comprises four angled carriers 1.i, wherein a single carrier 1.i can be subdivided into an angled carrier section 2.i and the remaining carriers 3.i.
  • a carrier 1.i does not necessarily have to by bending a straight one-piece output carrier may have been produced, but may also result by joining two carrier sections 2.i and 3.i at an angle.
  • the two support sections 2.i and 3.i need not necessarily be made of the same material.
  • the support 1.i preferably comprises an angled metal cooling plate, in particular an angled aluminum sheet.
  • the angled support section 2.i at least one LED 4.i with the associated board (not shown) attached. Relative to the longitudinal extension of the carrier 1.i, the LED 4.i is asymmetrically mounted on the carrier 1.i.
  • the board need not be limited to the angled support section 2.i, but may also extend to the remaining support 3.i.
  • the carrier 1.i can also be part of the board; In this case, a circuit board layer, for example an aluminum oxide layer, assumes the function of the carrier.
  • the board with the LED 4.i is mounted on the carrier 1.i in each case.
  • the support sections 3.i are each arranged parallel to a common axis.
  • Each two carriers 1.i are arranged with their support sections 3.i parallel to each other.
  • the two carriers 1.1 and 1.2 arranged in parallel extend in one direction along the common axis, while the two other mutually parallel carriers 1.3 and 1.4 extend in the opposite direction along the common axis.
  • the inner angle between the angled support section 2.i and the associated support section 3.i corresponds to half the outer angle between two angled support sections 2.i of two parallel support 1.i.
  • Fig. 1 shows how out Fig. 1 Furthermore, the four carriers 1.i are arranged, each with an LED 4.i mounted thereon, such that the LEDs 4.i on the angled carrier sections 2.i are in solid angles which essentially correspond to the solid angles of a polyder, here one Tetrahedrons, correspond.
  • the LEDs 4.i on the angled support sections 2.i should be brought together as closely as possible. Therefore, in Fig. 1 not only the solid angles of the angled support sections 2.i those of a tetrahedron, but the angled support surfaces 2.i together form essentially a tetrahedron.
  • Fig. 2 an ideal tetrahedron shown.
  • the angled carrier sections 2.i taper towards their end in the form of a substantially isosceles trapezium.
  • the angled support section 2.i could also be executed in the form of an equilateral triangle.
  • the heat loss of the individual LED 4.i can be dissipated sufficiently from the angled support section 2.i via the support section 3.i. Because of the use of angled carrier 1.i, a further cooling surface in the form of the carrier section 3.i is provided for each LED 4.i next to the surface 2.i on which the respective LED 4.i is arranged. As a result, the available surface for heat dissipation is significantly increased, so that the thermal resistance decreases.
  • Fig. 3 shows the radiation pattern of in Fig. 1 illustrated LED bulb.
  • the individual radiation components 5.i of the LEDs 4.i are shown, which have been projected into a common plane.
  • Each LED 4.i has a beam angle of 120 °.
  • the total radiation results from the superposition of the individual radiation components 5.i. How out Fig. 3 can be seen, the LED illuminant according to Fig. 1 an omnidirectional radiation characteristic.
  • Fig. 4 is shown second embodiment of an LED light-emitting device according to the invention. Equipped with the same reference numerals components of the two bulbs in Fig. 1 and Fig. 4 correspond to each other. Unlike the in Fig. 1 shown bulbs have in the bulb in Fig. 4 the carrier 1.i, in particular the support sections 3.i, holes 6. Preferably, the holes are produced by punching a cooling plate. Due to the holes 6 in the support 1.i, the surface available for heat dissipation is increased, so that the thermal resistance decreases.
  • Fig. 5 shows a third embodiment of an LED lamp according to the invention. Equipped with the same reference numerals components of the two bulbs in Fig. 1 and Fig. 5 correspond to each other. Unlike the in Fig. 1 illustrated bulbs are in the in Fig. 5 illustrated illuminants, the support sections 3.i curved about the common axis, so that the support sections 3.i substantially form a tubular heat sink. As a result, the available surface for heat dissipation is further increased, since the opposite side surfaces of the support sections 3.1 and 3.2 or 3.3 and 3.4 are used for thermal coupling of the heat sink to the environment of the heat sink. The thermal resistance can be further reduced if the carriers 1.i are mounted on a bar press profile, in particular an aluminum bar press profile, so that the channel formed by the carrier sections 3.i is filled with the bar press profile.
  • a bar press profile in particular an aluminum bar press profile
  • Fig. 6 a fourth embodiment of an LED light-emitting device according to the invention is shown. Equipped with the same reference numerals components of the two bulbs in Fig. 1 and Fig. 6 correspond to each other.
  • the embodiment according to Fig. 1 be in the in Fig. 6 illustrated embodiment, six white LEDs interconnected, so that in comparison to the in Fig. 1 illustratedententifiesbeipspiel with four white LEDs results in a larger luminous flux.
  • six white LEDs with a luminous efficacy of 50 lm / W and a power of 2.5 W per LED reach a luminous flux of 750 Im.
  • the support sections 3.i are arranged parallel to a common axis.
  • Each three carriers 1.i namely the carrier 1.1, 1.2 and 1.3 or 1.4, 1.5 and 1.6, lie with their support sections 3.i each other.
  • the three beams 1.1, 1.2 and 1.3 extend in a direction along the common axis, while the beams 1.4, 1.5 and 1.6 extend in the opposite direction along the common axis.
  • the carriers 1.i each with an LED 4.i arranged thereon, are arranged such that the solid angles of the angled carrier sections 2.i substantially correspond to six selected solid angles of a cuboctahedron with a total of 14 side surfaces and thus 14 solid angles.
  • Fig. 7 an ideal cuboctahedron shown.
  • the surface shape of the angled support sections 2.i does not have to correspond to the surface shape of the side surfaces of a Kuboktaeders. So have the in Fig. 6 shown angled support sections 2.i in each case the area of a triangle, while in Fig. 7 shown cuboctahedron as side surfaces includes both triangles and squares.
  • Fig. 5 Similar to the in Fig. 5 illustrated embodiment with curved support sections 3.i are the opposite side surfaces of the support sections 3.1, 3.2 and 3.3 or 3.4, 3.5 and 3.6 free, so that these surfaces are used for thermal coupling of the heat sink to the environment of the heat sink. Furthermore, can - as in the embodiment in Fig. 5 - The carrier 1.i also attach to a bar press profile, so that the thermal coupling of the opposite side surfaces of the support sections 3.i is further improved to the environment.
  • Fig. 8 shows the radiation pattern of in Fig. 6 illustrated LED bulb.
  • the individual radiation components 5.i of the LEDs 4.i are shown, which have been projected into a common plane.
  • Each LED 4.i has a beam angle of 120 °.
  • the total radiation results from the superposition of the individual radiation components 5.i.
  • the LED illuminant according to Fig. 1 an omnidirectional radiation characteristic. Due to the use of six LEDs 4.i and the greater overlap of the cone-shaped radiation space angle of the individual LEDs, the angle dependence of the radiation is less than that in FIG Fig. 3 illustrated radiation pattern with four LEDs 4.i.
  • Fig. 9 is a finished LED bulb with a socket 6, a transformer housing 7 and an optional glass or plastic housing 8 shown schematically.
  • the LED illuminant further comprises a carrier arrangement equipped with LED elements, for example the carrier arrangement according to FIG Fig. 1 , Alternatively, could also in the FIGS. 4 . 5 and 6 comprises carrier assemblies shown.
  • Version 6 is a socket for common 230V or 12V lamps; for example, a version of the type E14, E 27, G9, B15d or R7s in the case of a high-voltage version or a version of the type Gy6.35, Gx5.3 in the case of a low-voltage version.
  • the version can be socketed on two sides instead of unilaterally.
  • the transformer housing 7 surrounds electrical circuit components (not visible), which are used to drive the LEDs.
  • the circuit components include a transformer which reduces the voltage on the socket (eg 230V or 12V) to a lesser value.
  • a rectifier is provided in AC operation.
  • the electrical circuit components preferably include circuit means (eg, a bias resistor or a JFET current source) for operating the constant current LEDs.
  • Connected to the electrical circuit components is the carrier arrangement whose LEDs are controlled by the electrical circuit components.
  • circuit components can also be partially or even completely mounted on the carrier arrangement.
  • a translucent glass or plastic housing 8 which surrounds the support assembly and is designed, for example, tubular.
  • the housing 8 may be made of clear or frosted glass or plastic.
  • FIG. 9 illustrated illuminant is suitable as a substitute for common bulbs, especially for common incandescent or halogen bulbs.

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  • 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)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Fastening Of Light Sources Or Lamp Holders (AREA)

Abstract

An LED lamp comprises a plurality of angular carriers (Li). Moreover, the angular carrier sections (2.i) of the carriers (1.i) are adjacent. The solid angles of the surface of the angular carrier sections (2.i) correspond substantially to different solid angles of a polyhedron. The LED lamp furthermore has a plurality of LED elements (4.i) which are disposed on the angular carrier sections (2.i). The heat of the individual LED elements (4.i) emanating from the angular carrier section (2.i) is dissipated over the remaining carrier (3.i).

Description

Die Erfindung betrifft ein LED-Leuchtmittel (LED - light emitting diode), eine Leuchte umfassend ein derartiges LED-Leuchtmittel sowie ein Verfahren zur Herstellung eines derartigen Leuchtmittels.The invention relates to an LED light source (LED - light emitting diode), a lamp comprising such an LED light source and a method for producing such a light source.

Leuchtmittel sind die lichtemittierenden Objekte einer Leuchte. Beispiele für gängige Leuchtmittel sind Glühlampen (auch als Glühbirnen bezeichnet), Halogenglühlampen oder Leuchtstofflampen. Durch die fortschreitende Entwicklung im Bereich der LEDs werden zunehmend auch LEDs als Leuchtmittel für Anwendungsfelder interessant, in denen gegenwärtig hauptsächlich noch Glühlampen, Halogenglühlampen oder Leuchtstofflampen vorherrschen.Illuminants are the light-emitting objects of a luminaire. Examples of common bulbs are incandescent (also referred to as light bulbs), halogen bulbs or fluorescent lamps. Due to the progressive development in the field of LEDs, LEDs are becoming increasingly interesting as lighting devices for fields of application in which incandescent lamps, halogen incandescent lamps or fluorescent lamps are currently predominant.

Eine LED ist ein auf einer Diode basierendes Halbleiterbauelement. Wenn durch die Diode in Durchlassrichtung Strom fließt, strahlt diese Licht aus. Durch die Wahl des Halbleitermaterials sowie der Dotierung kann die Wellenlänge des abgestrahlten Lichts beeinflusst werden.An LED is a diode-based semiconductor device. When current flows through the diode in the forward direction, it emits light. By choosing the semiconductor material and the doping, the wavelength of the emitted light can be influenced.

LEDs, die weißes Licht erzeugen (weiße LEDs), lassen sich dadurch herstellen, dass eine blaue LED mit Fluoreszenzfarbstoff bedeckt wird. Alternativ können auch mehrere Leuchtdioden, welche Licht in unterschiedlichen Farben ausstrahlen, zusammengeschaltet werden, so dass sich aufgrund der Farbaddition weißes Licht ergibt. Weiße LEDs sind als SMD-Bauteile (surface mounted device) erhältlich, welche mittels lötfähiger Anschlussflächen direkt auf einer elektrischen Platine gelötet werden können. Ferner sind weiße LEDs bereits auch fertig auf einer Platine (beispielsweise auf einer quadratischen Platine mit den Abmessungen 25×25 mm2) montiert erhältlich.LEDs that produce white light (white LEDs) can be made by covering a blue LED with fluorescent dye. Alternatively, a plurality of light-emitting diodes, which emit light in different colors, can be connected together so that white light results due to the color addition. White LEDs are available as SMD components (surface mounted device), which can be soldered directly to an electrical circuit board using solderable connection surfaces. Furthermore, are white LEDs already ready mounted on a circuit board (for example, mounted on a square board measuring 25 × 25 mm 2 ).

Wichtige Kenngrößen eines Leuchtmittels sind dessen Lichtausbeute in Lumen pro Watt (lm/W) sowie dessen Leistungsaufnahme. Gegenwärtig kommerziell erhältliche weiße LEDs weisen typischerweise eine Lichtausbeute von bis zu 50 lm/W sowie eine absolute Leistungsaufnahme von 2,5 W pro LED auf. Die Lichtausbeute von weißen LEDs liegt damit über der von Glüh- und Halogenglühlampen (typischerweise im Bereich von 10 lm/W bis 20 lm/W), aber unter der von Leuchtstofflampen (bis zu 110 lm/W).Important characteristics of a light source are its luminous efficacy in lumens per watt (lm / W) and its power consumption. Presently commercially available white LEDs typically have a light output of up to 50 lm / W and an absolute power consumption of 2.5 W per LED. The luminous efficacy of white LEDs is thus higher than that of incandescent and halogen incandescent lamps (typically in the range of 10 lm / W to 20 lm / W), but below that of fluorescent lamps (up to 110 lm / W).

Um ein konventionelles Leuchtmittel wie eine Glühlampe oder eine Halogenglühlampe zu ersetzen, sollte ein LED-Leuchtmittel einen vergleichbaren Lichtstrom liefern. Eine gängige 75W-Glühlampe für den Hochvolt-Betrieb (d. h. bei einer Netzspannung von 230 V oder 110 V) weist beispielsweise einen Lichtstrom von ungefähr 900 Im auf. Um mit einem LED-Leuchtmittel ungefähr den halben Lichtstrom einer derartigen 75W-Glühlampe zu erzielen, können beispielsweise 4 weiße LEDs mit 50 lm/W und einer Leistung von 2,5 W pro LED zusammengeschaltet werden, wobei sich ein Lichtstrom von 500 Im ergibt.To replace a conventional bulb such as an incandescent bulb or a halogen incandescent bulb, an LED bulb should deliver a comparable luminous flux. For example, a common 75W incandescent bulb for high voltage operation (i.e., at 230V or 110V line voltage) has a luminous flux of approximately 900 Im. To achieve approximately half the luminous flux of such a 75W incandescent lamp with an LED illuminant, for example, 4 white LEDs with 50 lm / W and a power of 2.5 W per LED can be interconnected, resulting in a luminous flux of 500 Im.

LEDs weisen aufgrund ihrer Bauform den Nachteil auf, dass einzelne LEDs im Unterschied zu Glühlampen mit nahezu omnidirektionaler Abstrahlcharakteristik lediglich einen Abstrahlwinkelbereich von typischerweise 120° bis maximal 180° erreichen.Due to their design, LEDs have the disadvantage that individual LEDs, in contrast to incandescent lamps having a virtually omnidirectional emission characteristic, only achieve an emission angle range of typically 120 ° to a maximum of 180 °.

Bei der Zusammenschaltung mehrerer LEDs muss gewährleistet sein, dass die Verlustwärme der LEDs in ausreichender Weise abgeführt wird, da sonst die LEDs überhitzt und zerstört werden.When connecting several LEDs, it must be ensured that the heat loss of the LEDs is adequately dissipated, otherwise the LEDs will overheat and be destroyed.

Aus der Druckschrift DE 200 13 605 U1 ist eine längliche röhrenförmige Lichtquelle bekannt, welche als Leuchtmittel ein Mehrzahl von SMD-LEDs aufweist. Ketten von SMD-LEDs sind dabei auf der Oberfläche eines Hohlkörpers montiert.From the publication DE 200 13 605 U1 For example, an elongated tubular light source is known, which has as a light source a plurality of SMD LEDs. Chains of SMD LEDs are mounted on the surface of a hollow body.

Ferner ist aus der Druckschrift DE 10 2004 004 947 A1 ein Leuchtmittel bekannt, welches die Form einer herkömmlichen Glühlampen aufweist. Dazu werden im Inneren des Leuchtmittels mehrere LEDs auf einen würfel- oder oktaederförmigen Träger montiert. Nachteilig an einer derartigen Anordnung ist, dass der Träger keine ausreichende Wärmeableitung gewährleistet.Furthermore, from the document DE 10 2004 004 947 A1 a light source is known, which has the shape of a conventional incandescent lamps. For this purpose, several LEDs are mounted on a cube or octahedral carrier inside the bulb. A disadvantage of such an arrangement is that the carrier does not ensure sufficient heat dissipation.

Des weiteren ist aus Druckschrift EP 1 510 754 A ein LED-Leuchtmittel bekannt, welches einen zylinderförmigen wärmeleitfähigen Korpus aufweist, welcher Vertiefungen besitzt, in die Trägerelemente mit LED-Leuchten eingebracht werden können.Furthermore, from publication EP 1 510 754 A an LED lamp known, which has a cylindrical heat-conductive body, which has depressions, can be introduced into the support elements with LED lights.

Es ist daher Aufgabe der vorliegenden Erfindung, ein LED-Leuchtmittel bereitzustellen, welches bei einem ausreichend großen Lichtstrom eine möglichst omnidirektionale Abstrahlcharakteristik bei gleichzeitig ausreichender Wärmeableitung aufweist. Ferner ist es Aufgabe der Erfindung, ein Verfahren zur Herstellung eines solchen Leuchtmittels anzugeben.It is therefore an object of the present invention to provide an LED light source, which has a possibly omnidirectional radiation characteristic with sufficient heat dissipation at a sufficiently large luminous flux. It is another object of the invention to provide a method for producing such a light source.

Die der Erfindung zugrunde liegenden Aufgabenstellungen werden durch die Merkmale der unabhängigen Ansprüche gelöst.The objects underlying the invention are achieved by the features of the independent claims.

Das erfindungsgemäße LED-Leuchtmittel gemäß Anspruch 1 umfasst eine Mehrzahl von Trägern, welche vorteilhafterweise gleichartig sind. Die Träger sind jeweils abgewinkelt. Vorteilhafterweise handelt es sich bei den Trägern um abgewinkelte Metallbleche.The LED lighting device according to the invention according to claim 1 comprises a plurality of carriers, which are advantageously similar. The carriers are each angled. Advantageously, the supports are angled metal sheets.

Ferner sind die Träger derart angeordnet, dass die abgewinkelten Trägerabschnitte der Träger benachbart sind, also beieinander liegen. Die Raumwinkel der Oberflächen der abgewinkelten Trägerabschnitte entsprechen im Wesentlichen unterschiedlichen Raurnwinkeln eines Polyeders. Dabei kann vorgesehen werden, dass nicht nur die Raumwinkel denen eines Polyeders entsprechen, sondern auch dass die abgewinkelten Trägerabschnitte in Form und Anordnung zueinander im Wesentlichen den Seiten eines Polyeders entsprechen.Furthermore, the carriers are arranged such that the angled carrier portions of the carrier are adjacent, so lie together. The solid angles of the surfaces of the angled carrier sections correspond essentially to different Raurnwinkeln a polyhedron. It can be provided that not only the solid angles correspond to those of a polyhedron, but also that the angled support sections in the form and Arrangement to one another substantially correspond to the sides of a polyhedron.

Erfindungsgemäß weist das LED-Leuchtmittel ferner eine Mehrzahl von (vorteilhafterweise weißen) LED-Elementen auf, beispielsweise weiße LED-SMDs, welche auf den abgewinkelten Trägerabschnitten angeordnet sind. Vorteilhafterweise wird dabei auf jedem abgewinkelten Trägerabschnitt zumindest ein LED-Element angeordnet. Die Wärme der einzelnen LED-Elemente wird jeweils ausgehend von dem abgewinkelten Trägerabschnitt über den übrigen Träger abgeführt. Bei einem LED-Element im Sinne der Anmeldung kann es sich sowohl um eine einzelne LED als auch um eine LED mit zugehöriger Platine handeln.According to the invention, the LED illuminant further comprises a plurality of (advantageously white) LED elements, for example white LED SMDs, which are arranged on the angled carrier sections. Advantageously, at least one LED element is arranged on each angled support section. The heat of the individual LED elements is in each case discharged from the angled support section over the remaining support. An LED element in the sense of the application can be both a single LED and an LED with associated board.

Aufgrund der Anordnung der LED-Elemente in verschiedenen Polyeder-Raumwinkeln lässt sich eine omnidirektionale Abstrahlcharakteristik des LED-Leuchtmittels erreichen. Da für die einzelnen LED-Elemente abgewinkelte Träger vorgesehen werden, kann die Wärme der einzelnen LED-Elemente ausgehend von dem abgewinkelten Trägerabschnitt über den übrigen Träger in ausreichender Weise abgeführt werden. Aufgrund der Verwendung abgewinkelter Träger ist so für jedes LED-Element neben der Fläche, auf dem das LED-Element angeordnet ist und welche dem abgewinkelten Trägerabschnitt entspricht, eine weitere Kühlfläche vorgesehen, welche dem übrigen Träger entspricht. Dadurch wird die zur Wärmeabfuhr zur Verfügung stehende Oberfläche deutlich vergrößert.Due to the arrangement of the LED elements in different polyhedron solid angles, an omnidirectional radiation characteristic of the LED light source can be achieved. Since angled carriers are provided for the individual LED elements, the heat of the individual LED elements, starting from the angled carrier section, can be dissipated via the remaining carrier in a sufficient manner. Due to the use of angled carrier, a further cooling surface is provided for each LED element next to the surface on which the LED element is arranged and which corresponds to the angled carrier section, which corresponds to the rest of the carrier. As a result, the surface available for heat dissipation is significantly increased.

Es wird darauf hingewiesen, dass ein abgewinkelter Träger nicht zwingend durch Biegen eines geraden Ausgangsträgers erzeugt worden ist. Ein derartiger Träger kann sich auch durch Aneinanderfügen zweier Trägerteile in einem Winkel ergeben.It should be noted that an angled support has not necessarily been created by bending a straight output carrier. Such a carrier can also result by joining two carrier parts at an angle.

Ferner wird das LED-Leuchtmittel nicht zwingend durch Zusammenfügen separater abgewinkelter Träger hergestellt. Es kann beispielsweise auch vorgesehen sein, dass zunächst die Trägerabschnitte, auf denen die LED-Elemente angeordnet sind oder später angeordnet werden, zusammengefügt werden und anschließend die abgewinkelten Trägerabschnitte angebracht werden.Furthermore, the LED illuminant is not necessarily made by assembling separate angled carriers. It can also be provided, for example be that first the support sections on which the LED elements are arranged or later arranged, are joined together and then the angled support sections are attached.

Vorteilhafterweise entspricht für zumindest zwei Träger, deren abgewinkelte Trägerabschnitte aneinander grenzen, der Innenwinkel zwischen dem abgewinkelten Trägerabschnitt und dem übrigen Träger der Hälfte des Außenwinkels zwischen den aneinander grenzenden abgewinkelten Trägerabschnitten dieser beiden Träger. Dadurch kann die Abschattung durch den übrigen Träger, der der Wärmeabfuhr dient, minimiert werden.Advantageously, for at least two carriers whose angled support sections adjoin one another, the inner angle between the angled support section and the remaining support corresponds to half of the outer angle between the adjoining angled support sections of these two supports. As a result, the shading by the rest of the carrier, which serves to dissipate heat can be minimized.

Gemäß einer vorteilhaften Ausführungsform sind zwei oder mehr Träger, insbesondere sämtliche Träger, parallel zu einer gemeinsamen Achse angeordnet. Dabei ist es bei der Anordnung gemäß Anspruch 1 von Vorteil, wenn sich eine erste Gruppe von Trägern in eine Richtung entlang der gemeinsamen Achse erstreckt, während sich eine zweite Gruppe von Trägern in die dazu entgegen gerichtete Richtung entlang der gemeinsamen Achse erstreckt.According to an advantageous embodiment, two or more carriers, in particular all carriers, are arranged parallel to a common axis. In this case, it is advantageous in the arrangement according to claim 1, when a first group of carriers extends in one direction along the common axis, while a second group of carriers extends in the direction opposite thereto along the common axis.

Es ist von Vorteil, wenn die abgewinkelten Trägerabschnitte verschiedenen Seitenflächen eines Polyeders oder Teilen dieser Seitenflächen im Wesentlichen entsprechen, so dass die benachbarten Trägerabschnitte derart angeordnet werden können, dass diese einen Polyeder bilden.It is advantageous if the angled support sections essentially correspond to different side surfaces of a polyhedron or parts of these side surfaces, so that the adjacent support sections can be arranged such that they form a polyhedron.

Vorteilhafterweise weist das LED-Leuchtmittel mindestens vier LED-Elemente auf. Selbst bei einem Abstrahlwinkelbereich von 120° pro LED-Element lässt sich so eine nahezu omnidirektionale Abstrahlcharakteristik erzielen.Advantageously, the LED illuminant has at least four LED elements. Even with a beam angle range of 120 ° per LED element, a nearly omnidirectional radiation characteristic can be achieved.

Bei dem Polyeder kann es sich um einen platonischer Körper handeln, bei dem die Seitenflächen zueinander kongruente regelmäßige Vielecke sind, von denen in jeder Ecke jeweils gleich viele zusammentreffen. Tetraeder (4 Seiten), Hexaeder (6 Seiten), Oktaeder (8 Seiten), Dodekaeder (12 Seiten) und Ikosaeder (20 Seiten) bilden jeweils einen platonischen Körper. Dementsprechend kann vorteilhaft vorgesehen werden, dass es sich bei dem Polyeder um einen Tetraeder handelt und das LED-Leuchtmittel vier abgewinkelte Trägerabschnitte umfasst, wobei die Raumwinkel der vier abgewinkelten Trägerabschnitte den vier Raumwinkeln des Tetraeders im Wesentlichen entsprechen. Insbesondere können die vier abgewinkelten Trägerabschnitte den Flächen eines Tetraeder in Form und Anordnung zueinander im Wesentlichen entsprechen. Bei Anordnung der abgewinkelten Trägerabschnitte entsprechend den Raumwinkeln eines Tetraeders lässt sich bereits mit 4 LEDs eine nahezu omnidirektionale Abstrahlcharakteristik erzeugen.The polyhedron may be a platonic body in which the side surfaces are regular polygons that are congruent to each other, of which the same number coincide in each corner. Tetrahedron (4 Pages), hexahedron (6 pages), octahedron (8 pages), dodecahedron (12 pages) and icosahedron (20 pages) each form a platonic solid. Accordingly, it may be advantageously provided that the polyhedron is a tetrahedron and the LED illuminant comprises four angled support sections, the solid angles of the four angled support sections essentially corresponding to the four solid angles of the tetrahedron. In particular, the four angled support sections may substantially correspond to the surfaces of a tetrahedron in shape and arrangement with respect to one another. When arranging the angled support sections corresponding to the solid angles of a tetrahedron, a nearly omnidirectional emission characteristic can already be produced with 4 LEDs.

Sind zwei oder mehr Träger entlang einer gemeinsamen Achse angeordnet, ist es von Vorteil, wenn die Träger entlang dieser Achse einen Kanal bilden, beispielsweise durch Krümmung der Träger um die gemeinsame Achse. Dadurch kann die Wärme auch über die Innenseiten der Träger abgeführt werden.If two or more carriers are arranged along a common axis, it is advantageous for the carriers to form a channel along this axis, for example by curving the carriers about the common axis. As a result, the heat can be dissipated via the insides of the carrier.

Um die Wärmeabfuhr weiter zu verbessern, können die Träger vorteilhafterweise auf einem Stangenpressprofil, beispielsweise auf einem Aluminium-Stangenpressprofil, angebracht werden. In diesem Fall wird die Wärme über das thermisch gut leitende Stangenpressprofil abgeführt.In order to further improve the heat dissipation, the carriers may advantageously be mounted on a bar press profile, for example on an aluminum bar press profile. In this case, the heat is dissipated via the thermally well-conducting bar press profile.

Zur Vergrößerung der Oberfläche der Träger kann vorgesehen werden, dass die Träger Löcher aufweisen. Aufgrund der dadurch vergrößerten Oberfläche wird die Wärmeabfuhr weiter verbessert.To increase the surface area of the carriers it can be provided that the carriers have holes. Due to the thereby enlarged surface heat dissipation is further improved.

Vorteilhafterweise umfasst das LED-Leuchtmittel jeweils eine Fassung. Diese sollte vorteilhafterweise eine gängige Leuchtmittel-Fassung für den Hochvolt-Betrieb (typischerweise 230 Volt oder 110 Volt) oder den Niedervolt-Betrieb (typischerweise 12 Volt) sein. Dies ermöglicht die Verwendung des LED-Leuchtmittels als Ersatz für gängige Leuchtmittel, beispielsweise Glüh- oder Halogenglühlampen.Advantageously, the LED lighting means each comprise a socket. This should advantageously be a common bulb socket for high-voltage operation (typically 230 volts or 110 volts) or low-voltage operation (typically 12 volts). This allows the use of the LED bulb as a substitute for common bulbs, such as incandescent or halogen bulbs.

Ferner ist vorteilhafterweise ein elektronisches Vorschaltgerät (Transformator) in dem LED-Leuchtmittel vorgesehen.Furthermore, an electronic ballast (transformer) is advantageously provided in the LED lighting means.

Die erfindungsgemäße Leuchte nach Anspruch 20 umfasst ein vorstehend beschriebenes LED-Leuchtmittel.The luminaire according to the invention according to claim 20 comprises an above-described LED lighting means.

Das erfindungsgemäße Verfahren zur Herstellung eines LED-Leuchtmittels umfasst gemäß Anspruch 22 eine Mehrzahl von Schritten. In einem ersten Schritt wird eine Mehrzahl von abgewinkelten Trägern bereitgestellt. Auf den abgewinkelten Trägerabschnitten sind jeweils eine Mehrzahl von LED-Elementen angeordnet, wobei im Betrieb des LED-Leuchtmittels die Wärme der einzelnen LED-Elemente jeweils ausgehend von dem abgewinkelten Trägerabschnitt über den übrigen Träger abgeführt wird. In einem weiteren Schritt werden die Träger derart angeordnet, dass die abgewinkelten Trägerabschnitte benachbart sind und die Raumwinkel der Oberflächen der abgewinkelten Trägerabschnitte verschiedenen Raumwinkeln eines Polyeders im Wesentlichen entsprechen.The method according to the invention for producing an LED illuminant comprises a plurality of steps according to claim 22. In a first step, a plurality of angled carriers are provided. In each case a plurality of LED elements are arranged on the angled carrier sections, the heat of the individual LED elements in each case being removed from the angled carrier section via the remaining carrier during operation of the LED illuminant. In a further step, the carriers are arranged such that the angled carrier sections are adjacent and the solid angles of the surfaces of the angled carrier sections substantially correspond to different solid angles of a polyhedron.

Weitere vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.Further advantageous embodiments of the invention are specified in the subclaims.

Die Erfindung wird nachfolgend anhand mehrerer Ausführungsbeispiele unter Bezugnahme auf die Zeichnungen näher erläutert; in diesen zeigen:

Fig. 1
ein erstes Ausführungsbeispiel des erfindungsgemäßen LED-Leuchtmittels mit tetraederförmiger Anordnung der abgewinkelten Trägerabschnitte;
Fig. 2
einen idealen Tetraeder;
Fig. 3
ein Strahlungsdiagramm des in Fig. 1 dargestellten LED-Leuchtmittels;
Fig. 4
ein zweites Ausführungsbeispiel des erfindungsgemäßen LED-Leuchtmittels mit tetraederförmiger Anordnung der abgewinkelten Trägerabschnitte und Lochung der Kühlbleche;
Fig. 5
ein drittes Ausführungsbeispiel eines erfindungsgemäßen LED-Leuchtmittels mit tetraederförmiger Anordnung der abgewinkelten Trägerabschnitte und röhrenförmiger Krümmung der Kühlbleche;
Fig. 6
ein viertes Ausführungsbeispiel eines erfindungsgemäßen LED-Leuchtmittels mit sechs LEDs;
Fig. 7
einen idealen Kuboktaeder;
Fig. 8
ein Strahlungsdiagramm des in Fig. 6 dargestellten LED-Leuchtmittels; und
Fig. 9
ein LED-Leuchtmittel mit einer Fassung, einem Transformator-Gehäuse und einem optionalen Glas- oder Kunststoff-Gehäuse.
The invention will be explained in more detail with reference to several embodiments with reference to the drawings; in these show:
Fig. 1
a first embodiment of the LED lighting device according to the invention with tetrahedral arrangement of the angled support sections;
Fig. 2
an ideal tetrahedron;
Fig. 3
a radiation diagram of the in Fig. 1 illustrated LED bulb;
Fig. 4
a second embodiment of the LED lighting device according to the invention with a tetrahedral arrangement of the angled support sections and perforation of the cooling plates;
Fig. 5
a third embodiment of an LED lamp according to the invention with a tetrahedral arrangement of the angled support sections and tubular curvature of the cooling plates;
Fig. 6
A fourth embodiment of an LED lamp according to the invention with six LEDs;
Fig. 7
an ideal cuboctahedron;
Fig. 8
a radiation diagram of the in Fig. 6 illustrated LED bulb; and
Fig. 9
an LED lamp with a socket, a transformer housing and an optional glass or plastic housing.

Die nachfolgende Tabelle stellt die Lichtausbeute und die Gesamtverlustleistung eines weißen LED-Leuchtmittels in der Lichtfarbe warm-weiß (ca. 3500 K) in Abhängigkeit der Anzahl der verwendeten weißen LEDs und der LED-Kenngrößen (Leistung pro LED in Watt sowie Lichtausbeute in Lumen pro Watt) dar. Ein niedriger Lichtstrom liegt dabei im Bereich 500 bis 750 Im, ein hoher Lichtstrom ergibt sich ab 1000 Im. Ferner ist davon auszugehen, dass bei einer Gesamtverlustleistung ab 30 W das Leuchtmittel sehr heiß wird. Bei einer Gesamtverlustleistung über 40 W wird das Leuchtmittel zu heiß, so dass es zerstört wird. Leistung 50 lm/W 70 lm/W 100 lm/W pro LED 4 LEDs 6 LEDs 8 LEDs 4 LEDs 6 LEDs 4 LEDs 6 LEDs 2,5 W 500 lm (10 W) 750 Im (15 W) 1000 lm (20 W) 700 lm (10 W) 1050 lm (15 W) 1000 lm (10 W) 1500 lm (15 W) 5W 1000 lm (20 W) 1500 lm (30 W) 2000 lm (40 W) 1400 lm (20 W) 2100 lm (30 W) 2000 Im (20 W) 3000 lm (30 W) 10 W 2000 lm (40 W) 3000 lm (60 W) 4000 lm (80 W) 2800 lm (40 W) 4200 lm (60 W) 4000 (40 W) 6000 lm (60 W) The following table shows the luminous efficiency and the total power loss of a white LED illuminant in the light color warm-white (about 3500 K) depending on the number of white LEDs used and the LED characteristics (power per LED in watts and luminous efficacy in lumens per A low luminous flux is in the range of 500 to 750 Im, a high luminous flux is from 1000 Im. Furthermore, it can be assumed that at a total power loss from 30 W, the bulb is very hot. At a total power loss over 40 W, the bulb becomes too hot, so it is destroyed. power 50 lm / W 70 lm / W 100 lm / W per LED 4 LEDs 6 LEDs 8 LEDs 4 LEDs 6 LEDs 4 LEDs 6 LEDs 2.5 W 500 lm (10 W) 750 Im (15 W) 1000 lm (20 W) 700 lm (10 W) 1050 lm (15 W) 1000 lm (10 W) 1500 lm (15 W) 5W 1000 lm (20 W) 1500 lm (30 W) 2000 lm (40 W) 1400 lm (20 W) 2100 lm (30 W) 2000 Im (20 W) 3000 lm (30 W) 10W 2000 lm (40 W) 3000 lm (60 W) 4000 lm (80 W) 2800 lm (40 W) 4200 lm (60 W) 4000 (40 W) 6000 lm (60 W)

Weiße LEDs mit einer Verlustleistung von 2,5 W und einer Lichtausbeute von 50 lm/W sind bereits zum gegenwärtigen Zeitpunkt verfügbar. Es ist davon auszugehen, dass ab dem Jahr 2008 weiße LEDs mit einer Verlustleistung von 5 W pro LED und einer Lichtausbeute von 50 lm/W oder alternativ mit einer Verlustleistung von 2,5 W und einer Lichtausbeute von 70 lm/W kommerziell erhältlich sein werden.White LEDs with a power loss of 2.5 W and a luminous efficacy of 50 lm / W are already available at the present time. It is expected that from 2008, white LEDs with a power dissipation of 5 W per LED and a luminous efficiency of 50 lm / W or alternatively with a power loss of 2.5 W and a luminous efficacy of 70 lm / W will be commercially available ,

Wie aus obiger Tabelle ersichtlich, sollten zum Ersatz einer gängigen 75W-Glühlampe mit ungefähr 900 Im Lichtstrom mindestens vier, besser sechs weiße LEDs mit einer Lichtausbeute von 50 lm/W und einer Leistung von 2,5 W pro LED zusammengeschaltet werden, wobei sich dann ein Lichtstrom von 500 Im bzw. 750 Im ergibt.As can be seen from the above table, to replace a standard 75W incandescent light bulb with approximately 900 in the luminous flux, at least four, better six, white LEDs with a luminous efficacy of 50 lm / W and a power of 2.5 W per LED should be interconnected a luminous flux of 500 Im or 750 Im results.

Fig. 1 zeigt ein erstes Ausführungsbeispiel des erfindungsgemäßen LED-Leuchtmittels mit vier weißen LEDs 4.i mit i = 1, 2, 3 und 4. Auf die Darstellung des Gehäuses, der Fassung sowie der elektrischen Schaltungskomponenten zur Ansteuerung der LEDs wurde verzichtet. Das LED-Leuchtmittel umfasst vier abgewinkelte Träger 1.i, wobei sich ein einzelner Träger 1.i in einen abgewinkelten Trägerabschnitt 2.i und den übrigen Träger 3.i untergliedern lässt. Ein derartiger Träger 1.i muss nicht zwingend durch Biegen eines geraden einstückigen Ausgangsträgers erzeugt worden sein, sondern kann sich auch durch Aneinanderfügen zweier Trägerabschnitte 2.i und 3.i in einem Winkel ergeben. In diesem Fall müssen die beiden Trägerabschnitte 2.i und 3.i nicht zwingend aus dem gleichen Material gefertigt sein. Vorzugsweise umfasst der Träger 1.i ein abgewinkeltes Kühlblech aus Metall, insbesondere ein abgewinkeltes Aluminiumblech. Fig. 1 shows a first embodiment of the LED lighting device according to the invention with four white LEDs 4.i with i = 1, 2, 3 and 4. On the presentation of the housing, the socket and the electrical circuit components for driving the LEDs has been omitted. The LED illuminant comprises four angled carriers 1.i, wherein a single carrier 1.i can be subdivided into an angled carrier section 2.i and the remaining carriers 3.i. Such a carrier 1.i does not necessarily have to by bending a straight one-piece output carrier may have been produced, but may also result by joining two carrier sections 2.i and 3.i at an angle. In this case, the two support sections 2.i and 3.i need not necessarily be made of the same material. The support 1.i preferably comprises an angled metal cooling plate, in particular an angled aluminum sheet.

Auf dem abgewinkelten Trägerabschnitt 2.i ist mindestens eine LED 4.i mit der zugehörigen Platine (nicht dargestellt) angebracht. Bezogen auf die Längserstreckung des Trägers 1.i ist die LED 4.i asymmetrisch auf dem Träger 1.i angebracht. Die Platine muss nicht auf den abgewinkelten Trägerabschnitt 2.i beschränkt sein, sondern kann sich auch auf den übrigen Träger 3.i erstrecken. Der Träger 1.i kann auch Teil der Platine sein; in diesem Fall übernimmt eine Platinenschicht, beispielsweise eine Alumiumoxid-Schicht, die Funktion des Trägers. Vorzugsweise wird jeweils die Platine mit der LED 4.i auf dem Träger 1.i angebracht.On the angled support section 2.i at least one LED 4.i with the associated board (not shown) attached. Relative to the longitudinal extension of the carrier 1.i, the LED 4.i is asymmetrically mounted on the carrier 1.i. The board need not be limited to the angled support section 2.i, but may also extend to the remaining support 3.i. The carrier 1.i can also be part of the board; In this case, a circuit board layer, for example an aluminum oxide layer, assumes the function of the carrier. Preferably, the board with the LED 4.i is mounted on the carrier 1.i in each case.

Die Trägerabschnitte 3.i sind jeweils parallel zu einer gemeinsamen Achse angeordnet. Jeweils zwei Träger 1.i sind mit ihren Trägerabschnitten 3.i parallel zueinander angeordnet. Die beiden parallel angeordneten Träger 1.1 und 1.2 erstrecken sich in eine Richtung entlang der gemeinsamen Achse, während sich die beiden anderen zueinander parallel angeordneten Träger 1.3 und 1.4 in die dazu entgegen gerichtete Richtung entlang der gemeinsamen Achse erstrecken. Der Innenwinkel zwischen dem abgewinkelten Trägerabschnitt 2.i und dem zugehörigen Trägerabschnitt 3.i entspricht der Hälfte des Außenwinkel zwischen zwei abgewinkelten Trägerabschnitten 2.i zweier paralleler Träger 1.i.The support sections 3.i are each arranged parallel to a common axis. Each two carriers 1.i are arranged with their support sections 3.i parallel to each other. The two carriers 1.1 and 1.2 arranged in parallel extend in one direction along the common axis, while the two other mutually parallel carriers 1.3 and 1.4 extend in the opposite direction along the common axis. The inner angle between the angled support section 2.i and the associated support section 3.i corresponds to half the outer angle between two angled support sections 2.i of two parallel support 1.i.

Wie aus Fig. 1 ferner ersichtlich, werden die vier Träger 1.i mit jeweils einer darauf angebrachten LED 4.i so angeordnet, dass die LEDs 4.i auf den abgewinkelten Trägerabschnitten 2.i sich in Raumwinkeln befinden, welche im Wesentlichen den Raumwinkeln eines Polyders, hier eines Tetraeders, entsprechen. Dies ermöglicht eine omnidirektionale Abstrahlcharakteristik. Zur näherungweisen Bildung eines Punktstrahlers sollten die LEDs 4.i auf den abgewinkelten Trägerabschnitten 2.i möglichst nah zusammengebracht werden. Daher entsprechen in Fig. 1 nicht nur die Raumwinkel der abgewinkelten Trägerabschnitte 2.i denen eines Tetraeders, sondern die abgewinkelten Trägerflächen 2.i bilden auch zusammen im Wesentlichen einen Tetraeder. Zum Vergleich ist in Fig. 2 ein idealer Tetraeder dargestellt.How out Fig. 1 Furthermore, the four carriers 1.i are arranged, each with an LED 4.i mounted thereon, such that the LEDs 4.i on the angled carrier sections 2.i are in solid angles which essentially correspond to the solid angles of a polyder, here one Tetrahedrons, correspond. This allows an omnidirectional radiation characteristic. For the approximate formation of a spotlight, the LEDs 4.i on the angled support sections 2.i should be brought together as closely as possible. Therefore, in Fig. 1 not only the solid angles of the angled support sections 2.i those of a tetrahedron, but the angled support surfaces 2.i together form essentially a tetrahedron. For comparison, in Fig. 2 an ideal tetrahedron shown.

Zum Anordnen der abgewinkelten Trägerabschnitte in Tetraederform verjüngen sich die abgewinkelten Trägerabschnitte 2.i zu ihrem Ende hin in Form eines im Wesentlichen gleichschenkligen Trapezes. Alternativ könnte der abgewinkelte Trägerabschnitt 2.i jeweils auch in Form eines gleichseitigen Dreiecks ausgeführt werden.For arranging the angled carrier sections in tetrahedral form, the angled carrier sections 2.i taper towards their end in the form of a substantially isosceles trapezium. Alternatively, the angled support section 2.i could also be executed in the form of an equilateral triangle.

Im Betrieb des LED-Leuchtmittels kann die Verlustwärme der einzelnen LED 4.i ausgehend von dem abgewinkelten Trägerabschnitt 2.i über den Trägerabschnitt 3.i in ausreichender Weise abgeführt werden. Aufgrund der Verwendung abgewinkelter Träger 1.i ist nämlich für jede LED 4.i neben der Fläche 2.i, auf der die jeweilige LED 4.i angeordnet ist, eine weitere Kühlfläche in Form des Trägerabschnitts 3.i vorgesehen. Dadurch wird die zur Wärmeabfuhr zur Verfügung stehende Oberfläche deutlich vergrößert, so dass der thermische Widerstand sinkt.During operation of the LED illuminant, the heat loss of the individual LED 4.i can be dissipated sufficiently from the angled support section 2.i via the support section 3.i. Because of the use of angled carrier 1.i, a further cooling surface in the form of the carrier section 3.i is provided for each LED 4.i next to the surface 2.i on which the respective LED 4.i is arranged. As a result, the available surface for heat dissipation is significantly increased, so that the thermal resistance decreases.

Fig. 3 zeigt das Strahlungsdiagramm des in Fig. 1 dargestellten LED-Leuchtmittels. In dem Strahlungsdiagramm sind die einzelnen Strahlungskomponenten 5.i der LEDs 4.i dargestellt, welche in eine gemeinsame Ebene projiziert worden sind. Jede LED 4.i weist jeweils einen Abstrahlwinkel von 120° auf. Die Gesamtstrahlung ergibt sich aus der Überlagerung der einzelnen Strahlungskomponenten 5.i. Wie aus Fig. 3 ersichtlich, weist das LED-Leuchtmittel gemäß Fig. 1 eine omnidirektionale Abstrahlcharakteristik auf. Fig. 3 shows the radiation pattern of in Fig. 1 illustrated LED bulb. In the radiation diagram, the individual radiation components 5.i of the LEDs 4.i are shown, which have been projected into a common plane. Each LED 4.i has a beam angle of 120 °. The total radiation results from the superposition of the individual radiation components 5.i. How out Fig. 3 can be seen, the LED illuminant according to Fig. 1 an omnidirectional radiation characteristic.

In Fig. 4 ist zweites Ausführungsbeispiel eines erfindungsgemäßen LED-Leuchtmittels dargestellt. Mit gleichen Bezugszeichen versehene Bestandteile der beiden Leuchtmittel in Fig. 1 und Fig. 4 entsprechen einander. Im Unterschied zu dem in Fig. 1 dargestellten Leuchtmittel weisen bei dem Leuchtmittel in Fig. 4 die Träger 1.i, insbesondere die Trägerabschnitte 3.i, Löcher 6 auf. Vorzugsweise werden die Löcher durch Stanzen eines Kühlbleches erzeugt. Aufgrund der Löcher 6 in dem Träger 1.i wird die zur Wärmeableitung zur Verfügung stehende Oberfläche vergrößert, so dass der thermische Widerstand sinkt.In Fig. 4 is shown second embodiment of an LED light-emitting device according to the invention. Equipped with the same reference numerals components of the two bulbs in Fig. 1 and Fig. 4 correspond to each other. Unlike the in Fig. 1 shown bulbs have in the bulb in Fig. 4 the carrier 1.i, in particular the support sections 3.i, holes 6. Preferably, the holes are produced by punching a cooling plate. Due to the holes 6 in the support 1.i, the surface available for heat dissipation is increased, so that the thermal resistance decreases.

Fig. 5 zeigt ein drittes Ausführungsbeispiel eines erfindungsgemäßen LED-Leuchtmittels. Mit gleichen Bezugszeichen versehene Bestandteile der beiden Leuchtmittel in Fig. 1 und Fig. 5 entsprechen einander. Im Unterschied zu dem in Fig. 1 dargestellten Leuchtmittel sind bei dem in Fig. 5 dargestellten Leuchtmittel die Trägerabschnitte 3.i um die gemeinsame Achse gekrümmt, so dass die Trägerabschnitte 3.i im Wesentlichen einen röhrenförmigen Kühlkörper bilden. Dadurch wird die zur Wärmeabfuhr zur Verfügung stehende Oberfläche weiter vergrößert, da die gegenüberliegenden Seitenflächen der Trägerabschnitte 3.1 und 3.2 bzw. 3.3 und 3.4 zur thermischen Ankopplung des Kühlkörpers an die Umgebung des Kühlkörpers genutzt werden. Der thermische Widerstand lässt sich noch weiter reduzieren, wenn die Träger 1.i auf einem Stangenpressprofil, insbesondere einem Aluminium-Stangenpressprofil, angebracht werden, so dass der von den Trägerabschnitten 3.i gebildete Kanal mit dem Stangenpressprofil ausgefüllt wird. Fig. 5 shows a third embodiment of an LED lamp according to the invention. Equipped with the same reference numerals components of the two bulbs in Fig. 1 and Fig. 5 correspond to each other. Unlike the in Fig. 1 illustrated bulbs are in the in Fig. 5 illustrated illuminants, the support sections 3.i curved about the common axis, so that the support sections 3.i substantially form a tubular heat sink. As a result, the available surface for heat dissipation is further increased, since the opposite side surfaces of the support sections 3.1 and 3.2 or 3.3 and 3.4 are used for thermal coupling of the heat sink to the environment of the heat sink. The thermal resistance can be further reduced if the carriers 1.i are mounted on a bar press profile, in particular an aluminum bar press profile, so that the channel formed by the carrier sections 3.i is filled with the bar press profile.

In Fig. 6 ist ein viertes Ausführungsbeispiel eines erfindungsgemäßen LED-Leuchtmittels dargestellt. Mit gleichen Bezugszeichen versehene Bestandteile der beiden Leuchtmittel in Fig. 1 und Fig. 6 entsprechen einander. Im Unterschied zu dem Ausführungsbeispiel gemäß Fig. 1 werden in dem in Fig. 6 dargestellten Ausführungsbeispiel sechs weiße LEDs zusammengeschaltet, so dass sich im Vergleich zu dem in Fig. 1 dargestellten Ausführungsbeipspiel mit vier weißen LEDs ein größerer Lichtstrom ergibt. Wie aus der vorstehenden Tabelle ersichtlich, lässt sich bei Zusammenschaltung sechs weißer LEDs mit einer Lichtausbeute von 50 lm/W und einer Leistung von 2,5 W pro LED ein Lichtstrom von 750 Im erreichen.In Fig. 6 a fourth embodiment of an LED light-emitting device according to the invention is shown. Equipped with the same reference numerals components of the two bulbs in Fig. 1 and Fig. 6 correspond to each other. In contrast to the embodiment according to Fig. 1 be in the in Fig. 6 illustrated embodiment, six white LEDs interconnected, so that in comparison to the in Fig. 1 illustrated Ausführungsbeipspiel with four white LEDs results in a larger luminous flux. As can be seen from the above table, when interconnected, six white LEDs with a luminous efficacy of 50 lm / W and a power of 2.5 W per LED reach a luminous flux of 750 Im.

Wie in Fig. 6 ersichtlich, sind die Trägerabschnitte 3.i parallel zu einer gemeinsamen Achse angeordnet. Jeweils drei Träger 1.i, nämlich die Träger 1.1, 1.2 und 1.3 bzw. 1.4, 1.5 und 1.6, liegen mit ihren Trägerabschnitten 3.i einander gegenüber. Die drei Träger 1.1, 1.2 und 1.3 erstrecken sich in eine Richtung entlang der gemeinsamen Achse, während sich die Träger 1.4, 1.5 und 1.6 in die dazu entgegen gerichtete Richtung entlang der gemeinsamen Achse erstrecken.As in Fig. 6 can be seen, the support sections 3.i are arranged parallel to a common axis. Each three carriers 1.i, namely the carrier 1.1, 1.2 and 1.3 or 1.4, 1.5 and 1.6, lie with their support sections 3.i each other. The three beams 1.1, 1.2 and 1.3 extend in a direction along the common axis, while the beams 1.4, 1.5 and 1.6 extend in the opposite direction along the common axis.

Die Träger 1.i mit jeweils einer darauf angeordneten LED 4.i werden so angeordnet, dass die Raumwinkel der abgewinkelten Trägerabschnitte 2.i sechs ausgesuchten Raumwinkeln eines Kuboktaeders mit insgesamt 14 Seitenflächen und damit 14 Raumwinkeln im Wesentlichen entsprechen. Zum Vergleich ist in Fig. 7 ein idealer Kuboktaeder dargestellt. Dabei muss die Flächenform der abgewinkelten Trägerabschnitte 2.i nicht der Flächenform der Seitenflächen eines Kuboktaeders entsprechen. So weisen die in Fig. 6 dargestellten abgewinkelten Trägerabschnitte 2.i jeweils die Fläche eines Dreiecks auf, während der in Fig. 7 dargestellte Kuboktaeder als Seitenflächen sowohl Dreiecke als auch Quadrate umfasst.The carriers 1.i, each with an LED 4.i arranged thereon, are arranged such that the solid angles of the angled carrier sections 2.i substantially correspond to six selected solid angles of a cuboctahedron with a total of 14 side surfaces and thus 14 solid angles. For comparison, in Fig. 7 an ideal cuboctahedron shown. Here, the surface shape of the angled support sections 2.i does not have to correspond to the surface shape of the side surfaces of a Kuboktaeders. So have the in Fig. 6 shown angled support sections 2.i in each case the area of a triangle, while in Fig. 7 shown cuboctahedron as side surfaces includes both triangles and squares.

Ähnlich wie bei dem in Fig. 5 dargestellten Ausführungsbeispiel mit gekrümmten Trägerabschnitten 3.i liegen die gegenüberliegenden Seitenflächen der Trägerabschnitte 3.1, 3.2 und 3.3 bzw. 3.4, 3.5 und 3.6 frei, so dass diese Oberflächen zur thermischen Ankopplung des Kühlkörpers an die Umgebung des Kühlkörpers genutzt werden. Ferner lassen sich - wie bei dem Ausführungsbeispiel in Fig. 5 - die Träger 1.i auch auf einem Stangenpressprofil anbringen, so dass die thermische Ankopplung der gegenüberliegenden Seitenflächen der Trägerabschnitte 3.i an die Umgebung weiter verbessert wird.Similar to the in Fig. 5 illustrated embodiment with curved support sections 3.i are the opposite side surfaces of the support sections 3.1, 3.2 and 3.3 or 3.4, 3.5 and 3.6 free, so that these surfaces are used for thermal coupling of the heat sink to the environment of the heat sink. Furthermore, can - as in the embodiment in Fig. 5 - The carrier 1.i also attach to a bar press profile, so that the thermal coupling of the opposite side surfaces of the support sections 3.i is further improved to the environment.

Fig. 8 zeigt das Strahlungsdiagramm des in Fig. 6 dargestellten LED-Leuchtmittels. In dem Strahlungsdiagramm sind die einzelnen Strahlungskomponenten 5.i der LEDs 4.i dargestellt, welche in eine gemeinsame Ebene projiziert worden sind. Jede LED 4.i weist jeweils einen Abstrahlwinkel von 120° auf. Die Gesamtstrahlung ergibt sich aus der Überlagerung der einzelnen Strahlungskomponenten 5.i. Wie aus Fig. 8 ersichtlich, weist das LED-Leuchtmittel gemäß Fig. 1 eine omnidirektionale Abstrahlcharakteristik auf. Aufgrund der Verwendung von sechs LEDs 4.i und der damit größeren Überlappung der kegelförmigen Abstrahlraumwinkel der einzelnen LEDs ist die Winkelabhängigkeit der Strahlung geringer als bei dem in Fig. 3 dargestellten Strahlungsdiagramm mit vier LEDs 4.i. Fig. 8 shows the radiation pattern of in Fig. 6 illustrated LED bulb. In the radiation diagram, the individual radiation components 5.i of the LEDs 4.i are shown, which have been projected into a common plane. Each LED 4.i has a beam angle of 120 °. The total radiation results from the superposition of the individual radiation components 5.i. How out Fig. 8 can be seen, the LED illuminant according to Fig. 1 an omnidirectional radiation characteristic. Due to the use of six LEDs 4.i and the greater overlap of the cone-shaped radiation space angle of the individual LEDs, the angle dependence of the radiation is less than that in FIG Fig. 3 illustrated radiation pattern with four LEDs 4.i.

In Fig. 9 ist ein fertiges LED-Leuchtmittel mit einer Fassung 6, einem Transformator-Gehäuse 7 und einem optionalen Glas- oder Kunststoff-Gehäuse 8 schematisch dargestellt. Das LED-Leuchtmittel umfasst ferner eine mit LED-Elementen bestückte Trägeranordnung, beispielsweise die Trägeranordnung gemäß Fig. 1. Alternativ könnten auch die in den Figuren 4, 5 und 6 dargestellten Trägeranordnungen umfasst sein. Bei der in Fig. 9 dargestellten Fassung 6 handelt es sich um eine Fassung für gängige 230Volt- oder 12Volt-Lampen; beispielsweise um eine Fassung vom Typ E14, E 27, G9, B15d oder R7s im Fall einer Hochvolt-Fassung oder um eine Fassung vom Typ Gy6.35, Gx5.3 im Fall einer Niedervolt-Fassung. Außerdem kann die Fassung statt einseitig auch zweiseitig gesockelt sein. Das Transformator-Gehäuse 7 umgibt elektrische Schaltungskomponenten (nicht sichtbar), welcher zur Ansteuerung der LEDs verwendet werden. Vorzugsweise umfassen die Schaltungskomponenten im Wechselspannungsbetrieb einen Transformator, welcher die Spannung an der Fassung (beispielsweise 230 V oder 12V) auf einen geringeren Wert reduziert. Außerdem ist im Wechselspannungsbetrieb ein Gleichrichter vorgesehen. Da die LEDs mit einem Konstantstrom betrieben werden, umfassen die elektrischen Schaltungskomponenten vorzugsweise Schaltungsmittel (beispielsweise einen Vorwiderstand oder eine JFET-Stromquelle) zum Betrieb der LEDs mit Konstantstrom. An die elektrischen Schaltungskomponenten schließt sich die Trägeranordnung an, deren LEDs von dem elektrischen Schaltungskomponenten angesteuert werden. Die elektrischen Schaltungskomponenten können aber auch teilweise oder gar vollständig auf der Trägeranordnung angebracht sein.In Fig. 9 is a finished LED bulb with a socket 6, a transformer housing 7 and an optional glass or plastic housing 8 shown schematically. The LED illuminant further comprises a carrier arrangement equipped with LED elements, for example the carrier arrangement according to FIG Fig. 1 , Alternatively, could also in the FIGS. 4 . 5 and 6 comprises carrier assemblies shown. At the in Fig. 9 Version 6 is a socket for common 230V or 12V lamps; for example, a version of the type E14, E 27, G9, B15d or R7s in the case of a high-voltage version or a version of the type Gy6.35, Gx5.3 in the case of a low-voltage version. In addition, the version can be socketed on two sides instead of unilaterally. The transformer housing 7 surrounds electrical circuit components (not visible), which are used to drive the LEDs. Preferably, in AC mode, the circuit components include a transformer which reduces the voltage on the socket (eg 230V or 12V) to a lesser value. In addition, a rectifier is provided in AC operation. Since the LEDs are operated with a constant current, the electrical circuit components preferably include circuit means (eg, a bias resistor or a JFET current source) for operating the constant current LEDs. Connected to the electrical circuit components is the carrier arrangement whose LEDs are controlled by the electrical circuit components. The electrical However, circuit components can also be partially or even completely mounted on the carrier arrangement.

Optional ist ein lichtdurchlässiges Glas- oder Kunststoff-Gehäuse 8 vorgesehen, welches die Trägeranordnung umgibt und beispielsweise röhrenförmig ausgeführt ist. Dabei kann das Gehäuse 8 aus klarem oder satiniertem Glas bzw. Kunststoff gefertigt sein.Optionally, a translucent glass or plastic housing 8 is provided, which surrounds the support assembly and is designed, for example, tubular. In this case, the housing 8 may be made of clear or frosted glass or plastic.

Ein wie in Fig. 9 dargestelltes Leuchtmittel eignet sich als Ersatz für gängige Leuchtmittel, insbesondere für gängige Glühlampen oder Halogenglühlampen. A like in Fig. 9 illustrated illuminant is suitable as a substitute for common bulbs, especially for common incandescent or halogen bulbs.

Claims (22)

  1. LED-illuminant, comprising
    - a plurality of supports (1.i), which are respectively angled, wherein the supports (1.i) are arranged such that the angled support sections (2.i) are adjacent and the solid angles of the surfaces of the angled support sections (2.i) substantially correspond to different solid angles of a polyhedron, and
    - a plurality of LED-elements (4.i), which are arranged on the angled support sections (2.i), wherein the heat of the individual LED-elements (4.i) is respectively dissipated starting from the angled support section (2.i) via the rest of the support (3.i),
    characterized in that
    a first group of supports (1.1, 1.2) extends in one direction along the common axis, while a second group of supports (1.3, 1.4) extends in the opposite direction thereof along the common axis.
  2. LED-illuminant according to claim 1,
    characterized in that
    for at least two supports (1.1, 1.2), whose angled support sections (2.1, 2.2) are adjacent, the interior angle between the angled support section (2.1, 2.2) and the rest of the support (3.1, 3.2) corresponds to the half of the exterior angle between the adjacent angled support sections (2.1, 2.2) of said both supports (1.1, 1.2).
  3. LED-illuminant according to any one of the preceding claims
    characterized in that
    at least two of the supports (1.i) are arranged in parallel to a common axis.
  4. LED-illuminant according to any one of the preceding claims,
    characterized in that
    the supports (1.i) are identical.
  5. LED-illuminant according to any one of the preceding claims,
    characterized in that
    at least one LED-element (4.i), in particular one single LED-element is arranged on each angled support section (2.i).
  6. LED-illuminant according to any one of the preceding claims,
    characterized in that
    the angled support sections (2.i) substantially correspond to different side surfaces of a polyhedron or to parts of said surfaces.
  7. LED-illuminant according to claim 6,
    characterized in that
    the angled support sections (2.i) substantially form a polyhedron.
  8. LED-illuminant according to any one of the preceding claims,
    characterized in that
    the LED-illuminant comprises at least four LED-elements (4.i), in particular four, six or eight LED elements (4.1).
  9. LED-illuminant according to any one of the preceding claims,
    characterized in that
    the polyhedron is a tetrahedron and the LED-illuminant comprises four angled support sections (2.i), wherein the solid angles of the four angled support sections (2.i) substantially correspond to the four solid angles of the tetrahedron.
  10. LED-illuminant according to any one of the preceding claims,
    characterized in that
    the polyhedron is a cubic octahedron and the LED comprises six angled support sections (2.i), wherein the solid angles of the six angled support sections (2.i) substantially correspond to six different solid angles of the cubic octahedron.
  11. LED-illuminant according to any one of the preceding claims,
    characterized in that
    the supports (1.i) are angled metal sheets.
  12. LED-illuminant according to claim 3 or according to any one of the claims 4 to 11 backreferenced to claim 3,
    characterized in that
    the supports (1.i) form a channel along the common axis.
  13. LED-illuminant according to claim 3 or according to any one of the claims 4 to 12 backreferenced to claim 3,
    characterized in that
    the supports (1.i) are curved around the common axis.
  14. LED-illuminant according to claim 3 or according to any one of the claims 4 to 13 backreferenced to claim 3,
    characterized in that
    the supports (1.i) are mounted on a bar extrusion profile.
  15. LED-illuminant according to any one of the preceding claims,
    characterized in that
    the supports (1.i) provide holes for increasing the surface.
  16. LED-illuminant according to claim 3 or any one of claims 4 to 15 backreferenced to claim 3,
    characterized in that
    one or several electrical circuit components for operating the LED-elements (4.i), in particular a transformer, is arranged at one end of the support arrangement formed by the supports.
  17. LED-illuminant according to any one of the preceding claims,
    characterized in that
    the LED-illuminant comprises a socket (6), in particular a socket for conventional 230 V lamps or 12 V lamps.
  18. LED-illuminant according to any one of the preceding claims,
    characterized in that
    the LED-elements (4.i) respectively emit white light.
  19. LED-illuminant according to any one of the preceding claims,
    characterized in that
    the LED-illuminant provides an omni-directional emission characteristics.
  20. Lamp, which comprises a LED-illuminant according to one of the preceding claims.
  21. Use of a LED-illuminant according to claim 17 as replacement for a filament or halide lamp.
  22. Method for the fabrication of a LED-illuminant with the steps
    - providing a plurality of supports (1.i), which are respectively angled, and on whose angled support sections (2.i) a plurality of LED-elements (4.i) is respectively arranged on, wherein during the operation of the LED-illuminant the heat of the individual LED-elements (4.i) is respectively dissipated starting from the angled support section (2.i) via the rest of the support (3.i); and
    - arranging the supports (1.i) such that the angled support sections (2.i) are adjacent and the solid angles of the surfaces of the angled support sections (2.i) substantially correspond to different solid angles of a polyhedron, and
    - a first group of supports (1.1, 1.2) extends in one direction along the common axis, while a second group of supports (1.3, 1.4) extends in the opposite direction thereof along the common axis.
EP07857088A 2006-12-22 2007-12-21 Led lamp with omnidirectional light radiation and optimized heat dissipation Not-in-force EP2118562B1 (en)

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DE102006061020A DE102006061020B3 (en) 2006-12-22 2006-12-22 LED illuminant for use in lamp, has bent carrier sections that are joined and LEDs that are arranged on carrier sections, where solid angle of surface of sections corresponds to different solid angles of polyhedron
PCT/EP2007/011381 WO2008077627A1 (en) 2006-12-22 2007-12-21 Led lamp with omnidirectional light radiation and optimized heat dissipation

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US20110038152A1 (en) 2011-02-17
EP2118562A1 (en) 2009-11-18
CN101641551A (en) 2010-02-03
WO2008077627A1 (en) 2008-07-03
CN101641551B (en) 2012-08-29
US8382320B2 (en) 2013-02-26
DE102006061020B3 (en) 2008-05-21

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