EP2492590A1 - Lampe dotée d'un refroidissement passif - Google Patents

Lampe dotée d'un refroidissement passif Download PDF

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Publication number
EP2492590A1
EP2492590A1 EP11155452A EP11155452A EP2492590A1 EP 2492590 A1 EP2492590 A1 EP 2492590A1 EP 11155452 A EP11155452 A EP 11155452A EP 11155452 A EP11155452 A EP 11155452A EP 2492590 A1 EP2492590 A1 EP 2492590A1
Authority
EP
European Patent Office
Prior art keywords
luminaire according
luminaire
air
hollow chamber
lamp
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Withdrawn
Application number
EP11155452A
Other languages
German (de)
English (en)
Inventor
Stefan Tasch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lumitech Holding GmbH
Original Assignee
Lumitech Holding GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lumitech Holding GmbH filed Critical Lumitech Holding GmbH
Priority to EP11155452A priority Critical patent/EP2492590A1/fr
Publication of EP2492590A1 publication Critical patent/EP2492590A1/fr
Withdrawn legal-status Critical Current

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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
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/60—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air
    • F21V29/67—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air characterised by the arrangement of fans
    • F21V29/673—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air characterised by the arrangement of fans the fans being used for intake
    • 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
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/83—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks the elements having apertures, ducts or channels, e.g. heat radiation holes
    • 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
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/77—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical diverging planar fins or blades, e.g. with fan-like or star-like cross-section
    • F21V29/773—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical diverging planar fins or blades, e.g. with fan-like or star-like cross-section the planes containing the fins or blades having the direction of the light emitting axis
    • 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
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F21S8/02—Lighting devices intended for fixed installation of recess-mounted type, e.g. downlighters
    • F21S8/026—Lighting devices intended for fixed installation of recess-mounted type, e.g. downlighters intended to be recessed in a ceiling or like overhead structure, e.g. suspended ceiling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00—Planar light sources
    • F21Y2105/10—Planar light sources comprising a two-dimensional [2D] array of point-like light-generating elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the present invention relates to a luminaire with a light source and a passive cooling.
  • the invention particularly relates to a luminaire with a light-emitting diode (LED).
  • a by now typical light source is the light emitting diode (also luminescence diode), which is referred to herein for short as LED. It is a semiconductor electronic device in which light is emitted when current flows in the forward direction of the semiconductor. The wavelength of the light depends essentially on the semiconductor material and the selected doping.
  • the cooling of LED lights usually plays an important role as the operating temperature of the LEDs should be low ( ⁇ 120 ° C). Because even LEDs turn most of the electrical power, sometimes up to 80% of it, into heat.
  • the area of the semiconductor and the thermally coupled environment which is at the same time the only original possibility of radiating heat, is relatively small (for example, a semiconductor surface of the order of 1 mm 2 ).
  • the semiconductor crystal, and also located in the vicinity of electronic components must regularly not exceed a limit temperature of, for example, 120 ° Celsius. For a long service life, the temperature should also be as far below such a limit temperature.
  • the luminaire which includes a light source such as an LED, also has means for cooling.
  • the LEDs 100 are mounted on the underside of an aluminum body of the luminaire 10 to which the heat generated by the LEDs is transmitted.
  • the upper surface of the aluminum body is structured by vertical ridges or fingers 105 so that the surface that is in direct contact with the surrounding air is as large as possible.
  • a disadvantage of this design is that the heated air rises only slowly and must flow cooler air over the entire surface of the heat sink. In general, no stronger steady-state air flow is formed; small local temperature differences always lead to small-scale convection flows, which have only a small cooling effect. However, the cooling effect is largely dependent on higher flow velocities and large temperature differences.
  • FIG. 1 A second and in the Figures 2-4
  • the solution shown consists of a cylinder or prism-shaped heat sink 200, on the underside of the LEDs 100 are mounted. On the top is the operating electronics 210. On the cylinder or prismatic jacket are vertically extending cooling fins 220. The heated air rises along the vertically arranged cooling fins and from below, cooler air can flow. However, even in this case along the lamellae, only small-scale convection flows are formed, which reduce the cooling effect by means of small temperature differences and low flow velocities.
  • a luminaire having a luminous means and a cooling device, wherein the luminous means is a light-emitting diode, and the cooling device has at least one hollow chamber for forming a free flow.
  • the present invention makes use of the chimney effect. This is based on the principles of aerostatics, according to which warm air has a lower density than cold air. The warm air escapes upward, whereby new air is attracted by the resulting negative pressure within the hollow chamber, which leads to a self-preservation of the effect.
  • the terms “up” and “down” are used herein to describe the vertical position with respect to the luminaire.
  • the orientation is based on an orientation of the luminaire which corresponds to the orientation intended for actual operation.
  • the luminaire may be a ceiling light, such as a downlight, or a so-called “spot”.
  • the orientation The luminaire is regularly such that the LEDs are oriented downwards and there to develop their luminosity.
  • luminaire as used herein includes the holder for the lamp or illuminant.
  • holder or “socket” is understood to mean that the LED illuminant or the lamp can be fastened in or on it and can typically form a strong thermal coupling.
  • a luminaire regularly has cables or connecting contacts for connection to the electrical network.
  • the LED lamp is an exchangeable light source that can be placed in the socket or on the holder of a luminaire. This is done, for example, by simple insertion, by combined insertion and rotation, or by turning.
  • the luminaire also regularly contains attached electronics, for example to control the luminaire or to convert the mains voltage into the required voltage.
  • the LED lamp typically contains a base part intended to be received in the lampholder of a lamp, the semiconductor required for light generation, and possibly other elements such as a mirroring applied around the semiconductor, the so-called reflector, and / or at least one protective glass. While the LED lamp is a wear product with a limited lifespan, the luminaire is regularly set up for unrestricted operation, and therefore permanently mounted, for example, on a ceiling.
  • the at least one hollow chamber according to the invention has an inflow opening, which is normally arranged in the lower region of the hollow chamber.
  • the at least one hollow chamber according to the invention typically has an outflow opening, which is normally arranged in the upper region of the hollow chamber.
  • the at least one hollow chamber typically has a height of at least 3 cm or even at least 5 cm.
  • the air flow through the hollow chambers increases due to a higher altitude (see also the following formula briefing). Therefore, hollow chamber heights of at least 6 cm or even 7 cm may be required to dissipate high amounts of heat.
  • the cooling device may comprise a heat sink, which consists for example of a prism-shaped or cylindrical body. According to embodiments the body is fully open at the top, which guarantees a high outflow of heated air.
  • the inlet openings are laterally, i. in the lateral Verandung the hollow chambers.
  • the air sucked into the hollow chambers during operation leads to increased dust removal at the inlet openings. The dust removal leads to discoloration and is perceived as dirt. This is not conducive to the overall appearance of the luminaire. In particular, in ceiling lights, however, such dirt accumulations, which are deposited on the side of the inflow, and thus can not be seen from below, lead to any optical impairments.
  • the luminaire has an inner space and an outer space which comprises the at least one hollow chamber.
  • operating and / or control electronics can be located inside the body.
  • operating electronics is understood to mean the power electronics which convert the mains voltage to the necessary direct current.
  • Control electronics are understood to mean the electronics required to drive the LED, with which the parameters of the light emission, such as the intensity or the color locus, are set.
  • the electronics also typically contribute to the development of heat. It can therefore be arranged freely within the interior of the lamp, whereby it participates on the one hand on their version in the lamp material to the cooling by the cooling device, and on the other hand gives off heat to the air flowing around it.
  • the electronics may also be embedded in a heat-conductive potting compound.
  • the number of hollow chambers is according to embodiments between 5 and 30, in particular between 10 and 20.
  • the outer space serves to cool the lamp, while the interior, for example.
  • the storage of electronic elements is used.
  • at least one LED illuminant is mounted on the underside of the interior.
  • the bottom can also be mirrored or at least partially reflective, which also reduces the heat absorption through the bottom.
  • the underside of the outer space is open, so that air can flow into the hollow chamber, or the underside of the outer space is closed, so that the air can flow through laterally arranged inlet openings into the hollow chambers.
  • the size of the inlet openings is between 2 mm 2 and 5 mm 2 .
  • the interior can essentially form a cylinder or a prism. Additionally or alternatively, it is typical that also the outer space forms a cylinder or a prism.
  • the interior and the exterior are preferably arranged concentrically.
  • the individual hollow chambers may be separated by typically vertical cooling fins.
  • the cooling fins represent the separation between the cavities and thus contribute significantly to the cooling capacity of the cooling device.
  • a refinement of the invention provides for the interior space located above the mounting surface of the LEDs, in which, for example, the operating electronics is installed, to be filled with a potting compound which is typically thermally conductive.
  • the potting compound may additionally be designed to be electrically insulating, in particular if the existing electronics would otherwise be short-circuited via the potting compound.
  • the heat transfer from the operating electronics to the hollow chambers and thus to the heat dissipating surfaces can be significantly improved.
  • the heat transfer from the LEDs can be improved on the cooling device by the heat pipe volume of the lamp is increased and thus the temperature gradient is reduced in the overall body.
  • the heat to be dissipated by the bulbs must not flow entirely through the underside of the heat sink to the vertical cooling surfaces of the hollow chambers, sondem can additionally reach the cooling surfaces directly through the potting compound. This reduces the thermal resistance.
  • an active cooling can additionally be provided.
  • a fan is provided over the Luftausströmö réelleen the hollow chambers, the air sucks through the hollow chambers and typically emits upward.
  • a forced convection can be generated by the hollow chambers, which emits the resulting heat faster to the ambient air. Due to the positive guidance of the air through the hollow chambers, the entire enforced air is effective in terms of cooling technology.
  • the cooling device according to the invention which comprises at least one hollow chamber, also for active cooling an improved training, as with typical fan cooling electrical assemblies without the proposed forced guidance by hollow chambers larger amounts of air generally do not reach the cooling surfaces and thus do not contribute to the cooling. Furthermore, in the luminaire according to the invention with active cooling due to the hollow chambers with a lower turbulence of the air is to be expected. This also keeps the noise level low.
  • the surface may be provided with a corresponding coating, coating or surface treatment.
  • a coating, coating or surface treatment This is in particular the surface of the Hohlschbewandungen.
  • the paint, coating or surface treatment increase the temperature output primarily by convection.
  • the coating or coating may contain particles such as AlN or SiO 2 .
  • the cooling-technically effective surface can be increased.
  • a further reduction of the surface temperature can be achieved by up to 25 °.
  • FIG. 5 shows a plan view of an embodiment of the present inventive lamp 10 from below.
  • the inner space 510 shown in plan view from below has a plurality of LEDs 100 arranged on its underside.
  • the underside may be mirrored or at least partially reflective.
  • the interior is surrounded by the outer space 530 functioning as a cooling device, which comprises a multiplicity of hollow chambers 500.
  • the number of hollow chambers is in the in Fig. 5 In general, the number is at least 5 or at least 10.
  • the number of cavities is not greater than 50, preferably not greater than 40. As in FIG Fig. 5 By way of example, the cavities are fully open at the top and bottom so that the air can flow through them.
  • the at least one cavity more typically a plurality of the at least one cavity, has a cross-sectional area of from 0.5 cm 2 to 2 cm 2 .
  • the most homogeneous possible heat removal can take place in that the cavities are arranged equidistantly in the outer space.
  • Fig. 6 shows an example of a three-dimensional view of a lamp 10 according to embodiments of the invention.
  • the centrally visible interior 510 is surrounded by a Plurality of cavities 500.
  • the lamp may have a cylindrical outer shape. Since, for example, arranged in the interior electronics may not have a circular cross-section, but typically rather a rectangular or almost rectangular, it may be advantageous to choose the walling of the interior so that the electronics find space, but there is no excess space. For optimal cooling of the lamp, therefore, the entire other space within the Jardinraumbewandung is used to form cavities.
  • the luminaire can have at least one cavity part extension of the at least one cavity.
  • the cavity part extensions are typically of the same material as the cavity walls.
  • the cavity part extensions can serve, for example, to receive a reflector.
  • the inflow and / or outflow openings of the cavities are formed such that the cavities are designed to be open at the bottom and / or at the top. "Open” in this sense may also include a partial opening whose opening cross-section is smaller than the cavity cross-section. A complete opening is for example in Fig. 5 shown.
  • Fig. 7 shows by way of example in a longitudinal section an embodiment of the present invention, according to which the inflow openings 710 are not provided below, but to the side. As can be seen, the outer walls of the hollow chambers may have recesses serving as inflow openings. Further shows Fig. 7 at the bottom 720, the LEDs 100, on the generally frequently opposite top of the interior, the electronics 210 is arranged. In the Fig. 7 exemplified Lucasausströmö réelleen 730 are directed upward.
  • a laterally arranged inflow opening has, for example, the advantage that the luminaire 10, seen from below, has no opening, but rather the closed underside 720, which may be preferred for optical reasons.
  • the forming airflow 700 leads that is, laterally into the luminaire, in order then to follow the longitudinal course of the cavity 500 upwards and thereby absorb heat from the hollow chamber wall surfaces.
  • Fig. 8 shows a further longitudinal section of an embodiment of the present invention, in which an active ventilation 800 is additionally provided.
  • the ventilation in the upper part of the lamp is arranged (so-called. Suction ventilation).
  • the ventilation according to the embodiments contained herein is arranged such that the air movement generated by it has particular influence on the air movement within the at least one cavity. As a result, the flow rate and thus the heat transfer to the air flowing through can be increased.
  • the ventilation may also create an air flow in or over the interior of the luminaire.
  • active cooling with a power of between 0.1 W and 10 W, such as 1 W operate.
  • the vent typically includes a propeller 830 located above the cavities.
  • the propeller is operated by an electric motor (not shown) in accordance with embodiments. Ventilation is typically designed to increase the natural airflow that is dictated by the geometry of the luminaire, such as at least tenfold.
  • the propeller 830 may be disposed within a perimeter 820, which is typically a vertical extension of the outer walls of the cavities, in accordance with embodiments.
  • the axis 810 of the propeller 830 is normally centered and, in the case of concentrically arranged interior and exterior, simultaneously forms its center.
  • the propeller has 850 propeller openings, from which the sucked air is conveyed out.
  • Fig. 9 shown in longitudinal section embodiment of the present invention illustrates an example of the embedding 900 of the electronics 210 in a potting compound.
  • the electronics may consist of power electronics and / or control electronics.
  • the power electronics which may include a transformer, during operation regularly leads to a high heat output.
  • the total heat transfer and in particular the heat transfer from the electronics can be optimized by the embedding.
  • the potting compound fills the entire interior, so that the potting compound is in direct contact with the cavity walls, since - according to generally possible embodiments of the invention - the outer walling of the interior typically represents simultaneously the inner walling of the exterior space.
  • the potting compound typically consists of an electrically insulating and at the same time heat-conducting material.
  • A1 2 O 3 filled resins such as polyurethane or epoxy.
  • FIG. 9 The embedding in potting compound, which now by way of example with reference to the embodiment of FIG. 9 has been illustrated is possible according to all embodiments of the present invention.
  • the other elements of Fig. 9 corresponding to those of Fig. 8 In particular, all show FIGS. 7 to 10 the laterally arranged inflow openings.
  • the height h of the hollow chambers indicated.
  • the height of the hollow chamber may be understood as the length of the vertical walling, with any in-wall inflow or outflow opening, as exemplified in FIG Fig. 9 shown as belonging to the limitation.
  • an active cooling is combined with a filled with potting interior.
  • This possible embodiment benefits synergistically from the advantages already described:
  • the heat transfer from the heat-generating elements, ie the LEDs and, if necessary, the electronics, to the cooling cavities takes place due to the filling with typically heat-conducting potting compound improved.
  • cooling by the air flowing in the cavities also takes place better.
  • both the heat conduction within the lamp, as well as the heat output to the air is improved, which allows otherwise identical configuration, for example, the arrangement and operation of significantly more LEDs.
  • the orientation of the hollow chambers has always been described exclusively vertically in the embodiments described so far. This corresponds to the classic fireplace arrangement.
  • the hollow chambers also have a horizontal component in addition to a possibly dominant vertical component.
  • the hollow chambers would run upwards in a helical line along the outside. This may be advantageous, especially in the lower part, since an increased interaction with the cavity wall takes place as a result of the deflection of the air, so that once again an increased heat transfer can take place.
  • This embodiment is particularly relevant for lights whose orientation in the application can be arbitrary, as the z. B. in the case of spots.
  • FIGS. 11 and 12 Illustrate exemplary embodiments of the present invention, according to which the lamp is designed as a LED recessed ceiling luminaire (so-called "LED downlights"). These are usually recessed in the ceiling (flush-mounted installation) and connected directly to the mains. The entire electronics, especially for transforming the voltage, are already integrated in the downlights.
  • LED downlights LED recessed ceiling luminaire
  • the LED downlight 1100 in a schematic three-dimensional view Fig. 11 is shown for illustration without the outer chamber comprising the hollow chambers. It can be seen the Bewandung the interior 510 and above the LED lamp 1130 and thus also above the LED light source 100 arranged operating electronics 210.
  • the reflector 1120 surrounds the LED light-emitting means 100, where it obscures it in the illustration shown. Furthermore, a fastening device 1110 is shown, which serves the attachment of the lamp, for example in the ceiling.
  • Fig. 12 shows the same light as Fig. 11 However, this time including the outer space 530 containing the hollow chambers 500 for cooling. Evident are the Heilausströmö Stammen 730 of the outer space 530. Furthermore, the laterally arranged in the cavity wall Heileinströmö Anlagenen 710 can be seen. According to general possible and in Fig. 12 By way of example illustrated embodiments, the air inflow openings are at a height of up to 35% of the luminaire height, in particular between 5% and 30% of the luminaire height.
  • the luminaire can also be designed as a ceiling luminaire or as a spot.
  • a spot differs from a downlight or a ceiling light in that a mechanism is provided which allows pivoting of the bulb and thus the emission direction.
  • the lighting means is regularly fixedly connected to the cooling device. This means that pivoting of the luminous means is accompanied by simultaneous pivoting of the cooling device.
  • a ceiling light corresponds to a recessed ceiling light with the difference that the lamp is mounted on the ceiling.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
EP11155452A 2011-02-22 2011-02-22 Lampe dotée d'un refroidissement passif Withdrawn EP2492590A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11155452A EP2492590A1 (fr) 2011-02-22 2011-02-22 Lampe dotée d'un refroidissement passif

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11155452A EP2492590A1 (fr) 2011-02-22 2011-02-22 Lampe dotée d'un refroidissement passif

Publications (1)

Publication Number Publication Date
EP2492590A1 true EP2492590A1 (fr) 2012-08-29

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EP11155452A Withdrawn EP2492590A1 (fr) 2011-02-22 2011-02-22 Lampe dotée d'un refroidissement passif

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EP (1) EP2492590A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009091562A2 (fr) * 2008-01-15 2009-07-23 Philip Premysler Ampoule à del omnidirectionnelle
US20090296387A1 (en) * 2008-05-27 2009-12-03 Sea Gull Lighting Products, Llc Led retrofit light engine
EP2236917A1 (fr) * 2007-12-28 2010-10-06 Sharp Kabushiki Kaisha Radiateur et dispositif d'éclairage
EP2251595A2 (fr) * 2008-03-06 2010-11-17 Fawoo Technology Co., Ltd Système de ventilation de l'air chaud sans ventilateur pour un appareil d'éclairage del

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2236917A1 (fr) * 2007-12-28 2010-10-06 Sharp Kabushiki Kaisha Radiateur et dispositif d'éclairage
WO2009091562A2 (fr) * 2008-01-15 2009-07-23 Philip Premysler Ampoule à del omnidirectionnelle
EP2251595A2 (fr) * 2008-03-06 2010-11-17 Fawoo Technology Co., Ltd Système de ventilation de l'air chaud sans ventilateur pour un appareil d'éclairage del
US20090296387A1 (en) * 2008-05-27 2009-12-03 Sea Gull Lighting Products, Llc Led retrofit light engine

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