EP2547957B1 - Finned body for a power led lighting apparatus and lighting apparatus therewith - Google Patents

Finned body for a power led lighting apparatus and lighting apparatus therewith Download PDF

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Publication number
EP2547957B1
EP2547957B1 EP11729675.6A EP11729675A EP2547957B1 EP 2547957 B1 EP2547957 B1 EP 2547957B1 EP 11729675 A EP11729675 A EP 11729675A EP 2547957 B1 EP2547957 B1 EP 2547957B1
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EP
European Patent Office
Prior art keywords
finned
front seat
fin
slit
holes
Prior art date
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Active
Application number
EP11729675.6A
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German (de)
English (en)
French (fr)
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EP2547957A2 (en
Inventor
Antonio Di Gangi
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DI GANGI, ANTONIO
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Individual
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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
    • F21V29/85—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems characterised by the material
    • F21V29/89—Metals
    • 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
    • F21V29/75—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with fins or blades having different shapes, thicknesses or spacing
    • 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
    • F21V29/76—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
    • F21V29/767—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section the planes containing the fins or blades having directions perpendicular to the light emitting axis
    • 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
    • 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
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • F21S2/005—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction of modular construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S6/00—Lighting devices intended to be free-standing
    • F21S6/005—Lighting devices intended to be free-standing with a lamp housing maintained at a distance from the floor or ground via a support, e.g. standing lamp for ambient lighting
    • F21S6/007—Lighting devices intended to be free-standing with a lamp housing maintained at a distance from the floor or ground via a support, e.g. standing lamp for ambient lighting for indirect lighting only, e.g. torchiere with reflector bowl directed towards ceiling
    • 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
    • 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
    • F21S8/04—Lighting devices intended for fixed installation intended only for mounting on a ceiling or the like overhead structures
    • F21S8/06—Lighting devices intended for fixed installation intended only for mounting on a ceiling or the like overhead structures by suspension
    • F21S8/061—Lighting devices intended for fixed installation intended only for mounting on a ceiling or the like overhead structures by suspension with a non-rigid pendant, i.e. a cable, wire or chain
    • 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
    • F21V29/745—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades the fins or blades being planar and inclined with respect to the joining surface from which the fins or blades extend
    • 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 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]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations

Definitions

  • the present invention concerns the field of lighting equipment, and more precisely it relates to a method for making a finned heat dissipation device for a lighting apparatus that comprises power LED chips.
  • the invention relates to a power LED lighting apparatus with a high performance cooling system.
  • elements are available comprising power LED chips, which are made by microelectronic technology, where arrays consisting of a large number of single LED chips are very closely put together.
  • the power of a LED chip may be several Watts, normally it may range from 1 Watt up to several tenths of Watts, and a very high efficiency can be attained, for example, a luminous efficacy of more than 100 lumen/watt.
  • Cooling is one of the most critical concerns of the equipment in which this kind of lighting element is used. In fact, the higher the temperature, the lower the efficiency of the electronics of the lighting elements, and if no temperature control is provided, they can bum out in a very short time.
  • a power LED chip-based lighting element should not exceed a prefixed temperature limit, according to the manufacturer's suggestions. Accordingly, such elements must be assembled on a support that is adapted to absorb a large amount of heat, and to dissipate, when steady state conditions are established, all the adsorbed heat, thus remaining at a temperature lower than said temperature limit.
  • cooling is obtained by finned radiator elements, which, when exposed to outside air, allow a suitable dispersion of the heat generated by a power LED chip.
  • a high power multi-LED projector can only be made, by the present techniques, if a forced air circulation is provided against the finned radiator elements.
  • the forced circulation which is obtained by a fan, has the following drawbacks.
  • the use of a fan causes an additional energy consumption, which reduces one of the main advantages of power LED lighting apparatus, i.e. their low energy consumption.
  • the use of a fan affects the design of power LED lighting apparatus, thus hindering the designers' creativity.
  • the mechanical parts of the fan often deteriorate over time, which reduces efficiency and produces irritating noise.
  • EP2072893 a power LED lighting apparatus is described, in which no fan is provided.
  • the cooling is carried out only by finned radiator elements which provide a plurality of heat exchange surfaces that extend radially from a cylindrical body.
  • a finned radiator element is manufactured by a molding process, in which high heat capacity materials are used.
  • very large finned surfaces are required to dissipate heat naturally, i.e. without using fan elements.
  • more aesthetically pleasant casings may be used to hide the finned radiator elements. This way, however, the heat exchange efficiency decreases, which reduces the duration of the power LED chip.
  • a lighting apparatus which comprises a finned radiator body that is connected to a head body containing a light source.
  • the light source is arranged between the finned body and the head body and no direct contact is provided. In this case, the cooling of the light source is only partial and not so high to allow using a high power LED light source.
  • a finned body for a power LED lighting apparatus comprising:
  • second through holes are made on said front seat, in particular said second through holes are arranged more externally with respect to said first through holes, wherein said second through holes cross said finned body starting from said front seat towards said last fin, said second holes arranged to allow an axial air circulation and to assist heat exchange, in particular if the finned body is enclosed within a casing.
  • the distance d i is a fixed distance, whereas the diameters ⁇ i have decreasing values.
  • the root from which the fins extend has a conical shape, whose apex points towards a last fin An that is located at the farthest position from the front seat of the block where the power LED is mounted.
  • the conical shape of the root of the fins Ai optimizes cooling, since the heat flux and the temperature substantially decrease starting from the front seat where the power LED is mounted, towards the last fin.
  • the maximum root cross section is located at the hottest region, i.e. at the centre of the support base. Such region serves as a heat accumulator, just next to the application seat for a power LED chip, where a maximum dissipation heat flux occurs.
  • the distance d i and the diameters ⁇ i are fixed lengths. In this case, the heat flux reaches more easily the fins that are located farthest from the application seat for a power LED chip.
  • all the fins Ai have a fixed radius.
  • a first group of fins of radius r1 and a second group of fins of radius r2 longer than r1 are provided, starting from said front seat towards said last fin.
  • said finned body comprises an externally screw threaded front fastening portion at said support base, said front fastening portion arranged to allow coupling of the finned body with a support sleeve that is adapted to support a reflector body and to allow built-in mounting, for example, within false ceilings, walls, and so on.
  • said screw threaded front fastening portion is treated with a heat conductive paste, for example with a silver heat conductive paste.
  • said finned body is anodized aluminum, preferably black anodized aluminum, in order to obtain a good heat conductivity also at the surface of it, thus increasing efficiency and duration of the power LED chip.
  • a 6060, or 6026 or 6082, magnesium and silicon aluminum alloy may be used, which has a good machine tool workability.
  • a power LED lighting apparatus comprising a finned body, said finned body comprising:
  • a tubular casing is coupled with said finned body, said tubular casing having a bottom in which circulation apertures are made.
  • the apertures allow the passage of electrical supply wires and assist air circulation and change within the tubular casing of fresh air that skims over the finned body.
  • tubular casing is fixed to said finned body by a ring nut provided with a plurality of axial holes that engage on said support base. This way, air circulation is allowed from a front space that surrounds said reflector body, towards a rear space, which surrounds said finned body.
  • an aperture ring mask is provided between said tubular casing and said reflector body, which allows air circulation between the environment about said tubular casing and said front space.
  • a fresh air flow enters through the aperture mask into the front space that surrounds the reflector body, passes through the holes of said ring nut, passes through said rear space surrounding the finned body skimming over said fins, passes also through the holes of the finned body, thus mitigating its temperature, and flows outwards through the circulation apertures made through the bottom of the tubular body.
  • the ring nut and the tubular body are made of a heat-conductive material, such that a conduction heat flux occurs from said finned body towards said tubular body, the wide outer surface of which forms an ideal heat exchange surface for controlling the temperature of the finned body and, accordingly, the temperature of the power LED chip.
  • a power LED lighting apparatus comprises a plurality of said finned bodies mounted on a plate that is made of a heat-conductive material, and in such a way that all finned bodies protrude from a first face of said plate, and that each front seat of said finned bodies protrudes from a second side of said plate opposite to said first face.
  • a respective power LED chip and reflector bodies are mounted on each finned body, at said front seat.
  • the array of elementary lighting apparatus is cooled naturally whichever is the lighting power of the apparatus to dissipate.
  • the plate may be suspended at a predetermined height with a second side facing downwards.
  • the number of elementary lighting apparatus of the array may be selected responsive to the required luminance value.
  • the plate may have a first downwards-facing side, and a second upwards-facing side, in order to cast light downwards, and may have a plurality of holes made through the plate in order to cause warm air to circulate upwards through the plate.
  • a power led spotlight is characterized in that it comprises a finned body that is made according to the previous claims.
  • the above described objects are achieved also by a method for making a finned body, such method comprising the steps of:
  • a further step is provided of making second through holes on said front seat, in particular said second through holes arranged more externally with respect to said first through holes, wherein said second through holes cross said finned body starting from said front seat towards said last fin, said second holes arranged to allow an axial air circulation and to assist heat exchange, in particular if the finned body is enclosed within a casing.
  • a finned body 100 for a power LED lighting apparatus comprises a plurality of fins Ai at a distance d i from one another.
  • Each fin Ai extends from a root of material 3 that has a circular cross section of diameter ⁇ i.
  • root 3 extends from a support base 1 having a front face or portion 1a on which a front seat 2 is made for a power LED chip 20, shown hereinafter.
  • root 3 from which the fins Ai extend has a conical shape, whose apex points towards a last fin An, opposite to front seat 2 of the block where power LED chip 20 is mounted.
  • the decreasing conical shape of root 3 of fins Ai optimizes cooling, since in the central part of support base 1 the heat generated by power LED chip 20 is collected and is quickly dissipated towards fins Ai through the large cross section of conical root 3.
  • the conical shape allows the heat flux to reach all the fins starting from support base 1, on whose housing support 2 power LED chip 20 is mounted, towards last fin An.
  • diameters ⁇ i have a fixed value.
  • the root is cylindrical, and allows a high heat flux towards the farthest fins, which are close to last fin An, and are therefore adapted to dissipate a larger heat amount.
  • Each fin Ai may have a fixed radius or, as shown in Fig. 6 , a proximal first unit of fins of radius r1 and a second distal unit of fins of radius r2 longer than r1 may be provided.
  • the diameter of the fins may increase starting from front seat 2 towards last fin An. This way, by making fins with different sizes, the encumbrance of the front part of the finned body is reduced by making variable size fins, in order to assist built-in installations and to maximize the heat exchange surface.
  • Support base 1 of finned body 100 comprises a screw threaded fastening portion 5, for connection with other parts of the lamp, which are shown hereinafter. Furthermore, the finned body has a first series of through holes 8a, for passage of supply wires, and can have a second plurality of aeration through holes 8b. Holes 8a, 8b, can be made as shown in Fig. 8 , of which Fig. 1 is a cross sectional view, as indicated by arrows I-I. In Fig. 8 , further holes 8c are shown for fixing power LED chip 20 by means of screws (for example Fig.8B , screws 63).
  • a method for making finned body 100.
  • the method comprises the steps of prearranging a raw block 10, for example as an end portion of a rod made of a heat-conductive material.
  • the rod is made of anodized aluminum, in particular of black anodized aluminum, in order to obtain a good heat conductivity also at the surface, thus increasing the efficiency and the duration of the power LED chip.
  • a 6060, or 6026 or 6082 magnesium and silicon aluminum alloy may be used, which has a good machine tool workability.
  • housing support 2 is made on front face 1a of block 10 for a power LED chip 20.
  • the operation comprises using cutting instruments 40, for leveling and working front seat 2, as well as a step of cylindrical grinding external surfaces 5, 6 and 7.
  • Front seat 2 may comprise a protruding reference edge 4.
  • the various working steps are carried out by means of a numerical control lathe.
  • longitudinal through holes 8a and 8b are made on element 10 by a boring tool 41, starting from front seat 2.
  • a boring tool 41 for example, a step of boring may be carried out by means of a multiple boring tool.
  • fins A1, A2, A3,... are made on element 10 mounted on a lathe ( Fig. 4 ) by means of a cutting tool 42, which has a cut width lower than 3 mm, for example 2 mm, starting at a measured distance D from front seat 2, in order to form support base 1 of thickness D.
  • the first plane slit F1 is made by cutting tool 42 up to leaving a root that has a circular cross section of determined diameter ⁇ .
  • Tool 42 is then moved forward ( Fig. 5 ) from front seat 2 for a distance d1 longer than D, to make a second plane slit F2 up to leaving a root of material that has a circular cross section of determined diameter ⁇ 1 ( Fig.4 ). This way, first fin A1 is created between two slits F1 and F2.
  • a third plane slit F3 is made up to leaving a circular root of the material that has a cross section of determined diameter ⁇ 2, and second fin A2.
  • finned body 100 is obtained, as shown in Fig. 1 , in which each fin is at a distance di from the previous fin, and each fin Ai extends from a root of material that has a circular cross section of diameter ⁇ i. This way, the root from which the fins extend has a conical shape, whose apex points towards last fin An.
  • screw threaded front fastening portion 5 ( Fig. 1 ) is used for coupling parts of a lighting apparatus in which finned body 100 is used as a temperature regulation element of a power LED chip 20.
  • a spotlight is shown for built-in installation, which is obtained by fixing to finned body 100 a sleeve 140 provided with an abutment flange 130.
  • Sleeve 140 can be mounted by adding a heat conductive paste on screw threaded front fastening portion 5 of Fig. 1 , for example a silver heat conductive paste or any suitable product that is available on the market. This way, also sleeve 140, which is made of a heat conductive material, assists cooling finned body 100.
  • Fig. 7 shows how a reflector 110 is arranged within flanged sleeve 140.
  • the reflector is closed by a protection glass or lens, not shown.
  • Power LED chip 20 is arranged at the centre of the reflector, for example it is mounted on an aluminum plate 21.
  • the electric connection is provided by electric cables 61, which attains power LED chip 20 through holes 8a.
  • Power LED chip 20 may be equipped with an external power supply device, or it may be in the form of an integrated circuit, for example a multicore LED with printed integrated circuit board.
  • a remote power supply is also possible, by a wireless communication with the LED light source.
  • Plate 21 and chip 20 are shown more in detail in Fig. 9 , where welding points 62 of cables 61 are shown, which protrude from holes 8a, at angular slits 64 of plate 21. Furthermore, montage screws 63 are shown through blind holes 8c ( Fig. 8 ) at housing 2 of finned body 100.
  • another power LED lighting apparatus has a finned body 100 ( Fig.11 ) to which a cylindrical sleeve 140' may be connected instead of a flanged sleeve.
  • a tubular casing 120 On the extension of the cylindrical sleeve 140', a tubular casing 120 may be connected which has a bottom 121 where circulation apertures are made, for example by means of a grid 180. This way, the apertures allow the passage of electrical supply wires and assist air circulation and change within the tubular casing 120.
  • tubular casing 120 or sleeve 140', or a one-piece tubular body, not shown, is connected to the finned body by a ring nut 145 provided with a plurality of axial holes 146 that engage with support base 1.
  • a front space 150 which surrounds reflector body 110
  • a rear space 170 which surrounds finned body 100.
  • an aperture ring mask 130 is provided which is coupled with tubular sleeve 140' by a ring lock 132 and which allows air circulation 160 between the environment about the tubular casing and front space 150, through holes 131.
  • a fresh air flow enters front space 150 that surrounds reflector body 110 through aperture mask 130, passes through holes 146 of ring nut 145, passes through rear space 170 that surrounds finned body 100 skinning fins Ai, and also flows along through holes 8b of the finned body, controlling its temperature, and flows outwards through the circulation apertures that are obtained on a end grid 180 of tubular body 120.
  • ring nut 145 and tubular body 120,140' are made of a heat-conductive material, such that a conduction heat flux occurs from said finned body 100 towards said tubular body 120,140', the wide outer surface of which forms an ideal heat exchange surface for controlling the temperature of finned body 100 and, accordingly, the temperature of power LED chip 20.
  • a protection glass 191 is also shown, which can also be a lens, as well as a projection space 190 of the light generated by LED chip 20.
  • a fastening 122 is shown that is intended for a support, not shown, of the lighting apparatus.
  • a power LED lighting apparatus 200 is characterized in that it comprises a plurality of finned bodies 100 ( Fig. 13 ) made as described above, and mounted on a plate 201 of a heat-conductive material, in such a way that all finned bodies protrude from a first face 202 of the plate, and that each front seat 2 of the finned bodies protrudes from a second side 203 of plate 201 ( Fig. 12 ) opposite to first face 201.
  • a power LED chip 20 and a reflector body 110 are mounted on each finned body 100, at front seat 2.
  • Finned body 100 can be coupled with plate 201 by screwing it at screw threaded front fastening portion 5 of Fig. 1 , by adding conductive varnish or paste, for example a silver heat conductive paste or any suitable product that is available on the market.
  • plate 200 made of a heat conductive material, helps cooling finned body 100 with its large surface. Even the external frame of apparatus 200 assists heat exchange.
  • an apparatus can be made which can have any number of power LED chips.
  • the plate serves as a support for an array of elementary lighting apparatus (in the pictures an array of more elements is shown just as an example).
  • the array of elementary lighting apparatus is cooled naturally whichever the lighting power of the apparatus may be.
  • the plate can be suspended at a predetermined height as shown in Fig. 12 with second side 203 facing downwards.
  • the number of elementary lighting apparatus of the array may be established according to the required luminance value. This way, an apparatus of even hundreds of elements can be made, for example for lighting such large places as fitness facilities, theaters, factory sheds.
  • plate 201 may have first downwards-facing side 202, and second upwards-facing side 203, in order to cast light downwards, and may have a plurality of holes 204 made through the plate in order to cause warm air to circulate through plate 201 itself.
  • First face 202 may be protected in a not shown way by a grid that allows an easy air passage.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Luminescent Compositions (AREA)
EP11729675.6A 2010-03-17 2011-03-18 Finned body for a power led lighting apparatus and lighting apparatus therewith Active EP2547957B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPI2010A000029A IT1398867B1 (it) 2010-03-17 2010-03-17 Metodo per la fabbricazione di un corpo alettato di supporto per led di potenza
PCT/IB2011/000581 WO2011114226A2 (en) 2010-03-17 2011-03-18 Finned body for a power led lighting apparatus and lighting apparatus therewith

Publications (2)

Publication Number Publication Date
EP2547957A2 EP2547957A2 (en) 2013-01-23
EP2547957B1 true EP2547957B1 (en) 2018-10-03

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EP11729675.6A Active EP2547957B1 (en) 2010-03-17 2011-03-18 Finned body for a power led lighting apparatus and lighting apparatus therewith

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EP (1) EP2547957B1 (it)
IT (1) IT1398867B1 (it)
WO (1) WO2011114226A2 (it)

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CN104025323B (zh) * 2011-12-21 2017-12-26 英特尔公司 用于发光二极管的热管理
JP2015079604A (ja) * 2013-10-16 2015-04-23 株式会社小糸製作所 光源装置および車両用灯具
CN104696832B (zh) * 2015-03-31 2018-01-30 东莞市闻誉实业有限公司 Led路灯

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EP2547957A2 (en) 2013-01-23

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