WO2008122924A1 - Lampe de forme allongée comportant des diodes électroluminescentes et des lamelles de prolongement radial - Google Patents

Lampe de forme allongée comportant des diodes électroluminescentes et des lamelles de prolongement radial Download PDF

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Publication number
WO2008122924A1
WO2008122924A1 PCT/IB2008/051217 IB2008051217W WO2008122924A1 WO 2008122924 A1 WO2008122924 A1 WO 2008122924A1 IB 2008051217 W IB2008051217 W IB 2008051217W WO 2008122924 A1 WO2008122924 A1 WO 2008122924A1
Authority
WO
WIPO (PCT)
Prior art keywords
lamp
elongated member
lamellae
leds
transverse
Prior art date
Application number
PCT/IB2008/051217
Other languages
English (en)
Inventor
Lucas L. D. Van Der Poel
Jean P. Jacobs
Daniël A. BENOY
Original Assignee
Koninklijke Philips Electronics N.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2008122924A1 publication Critical patent/WO2008122924A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/51—Cooling arrangements using condensation or evaporation of a fluid, e.g. heat pipes
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V11/00—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00
    • F21V11/02—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 using parallel laminae or strips, e.g. of Venetian-blind type
    • 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
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
    • F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/14—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending longitudinally
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
    • 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
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
    • F21Y2103/10—Elongate light sources, e.g. fluorescent tubes comprising a linear 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]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S362/00—Illumination
    • Y10S362/80—Light emitting diode

Definitions

  • Elongated lamp comprising LEDs and radially extending lamellae
  • the invention relates to a lamp comprising a plurality of light-emitting diodes (LEDs) mounted on a heat-conductive elongated member at mutual distances in the axial direction.
  • the axial direction of the elongated member is the longitudinal direction of the lamp.
  • Such a lamp is disclosed in US-A-2004/0120152, which describes an elongated lamp referred to as lighting fixture.
  • the lamp comprises a mounting bar provided with one or more LED arrays.
  • the mounting bar is made of a heat-conductive material and has a plurality of heat-sink fins. In order to be dissipated, the heat produced by the LEDs can be conducted from the LEDs to the heat-sink fins through the mounting bar.
  • LEDs have many advantages over incandescent lamps, arc lamps and fluorescent light sources. Typically, LEDs produce less heat and can be more efficient than other types of light sources in many applications. However, historically, LEDs have only been useful in low-level lighting applications, for example, in indicator lamps, displays, and indoor signage. The availability of higher brightness LEDs has fostered new applications of LEDS in flashlights, traffic signal lights, outdoor signage, automobile headlights, backlighting for flat-panel displays, etc. A problem with high-brightness LEDs is dissipation of heat. Incandescent and arc lamp light sources dissipate most of their heat through infrared radiation. LEDs must dissipate their heat through thermal conduction.
  • Lamps comprising a plurality of LEDs can be designed as an alternative to conventional light sources and are capable of replacing typical fluorescent and incandescent lamps.
  • a LED can emit a bright light beam, and a lamp comprising a plurality of LEDs can be designed in such a way that its light radiation is similar to that of a conventional fluorescent or incandescent lamp.
  • tubular fluorescent lamps for use in a luminaire mounted in or on the ceiling of an office can be replaced by lamps consisting of an elongated bar carrying a plurality of LEDs along its length, as described in US-A-2004/0120152.
  • the light radiation should be directed within a certain area in front of the luminaire (below the luminaire), while inconvenient light radiation outside this area has to be avoided.
  • Such a luminaire can therefore be provided with lamellae in order to block light radiation outside said area in front of the luminaire, i.e. light radiation at relatively small angles to the surface of the ceiling. This prevents glare for people at some distance from the luminaire.
  • the elongated member is provided with a plurality of transverse lamellae made of a heat-conductive material, with each transverse lamella extending in a radial plane with respect to the longitudinal direction of the elongated member, said transverse lamellae being attached to the elongated member between the LEDs.
  • the transverse lamellae are thus located near the LEDs, which contributes to an effective heat conduction.
  • the transverse lamellae prevent light radiation in undesired directions, i.e. directions having a relatively small angle with respect to the longitudinal direction (axial direction) of the elongated member of the lamp.
  • the lamellae thus have an optical as well as a cooling function.
  • such a lamp can be used in a luminaire mounted in or on, or suspended from, a ceiling.
  • the heat-conductive material of the elongated member as well as the heat- conductive material of the transverse lamellae is preferably metal.
  • the material of the elongated member and/or the transverse lamellae may be aluminum, which is a relatively inexpensive material, or a copper alloy, which is a very suitable heat-conductive material.
  • the elongated member is a heat pipe.
  • a heat pipe is a very efficient means for use as the elongated member of the lamp.
  • a heat pipe is a heat-transfer mechanism which can transport large quantities of heat with a very small temperature difference between the hot and cold interfaces.
  • a typical heat pipe consists of a sealed hollow tube made of a heat-conductive metal such as copper or aluminum.
  • the pipe contains a relatively small quantity of a working fluid such as water, ammonia or ethanol, while the remainder of the pipe is filled with the vapor phase of the working fluid.
  • a heat pipe contains no moving parts and requires no maintenance.
  • the inner volume of the heat pipe may have a wick structure, so that the capillary effect enables the heat pipe to function in each direction.
  • the LEDs are preferably arranged in an array in the axial direction of the lamp, or in more of such arrays.
  • a conventional luminaire for a tubular fluorescent lamp has a reflecting inner wall, so that the light radiation from the rear side of the lamp is reflected.
  • the lamp according to the invention can be provided with one or more arrays of LEDs only at one side, which side corresponds to the front side of the luminaire and thus prevents radiation entering the housing of the luminaire, while the presence of a light- reflecting wall in the luminaire is not required.
  • each transverse lamella extends around the elongated member, so that a large contact area between the transverse lamellae and the elongated member as well as a large interface area between the transverse lamellae and the environmental air is achieved.
  • At least three transverse lamellae are preferably present, while at least one, preferably at least two LEDs are present between every two neighboring transverse lamellae, which results in an effective design of the lamp having a relatively large dimension in the longitudinal direction.
  • the thickness of the transverse lamellae preferably decreases in the radial direction away from the elongated member, so that the transverse lamella tapers towards its edge away from the elongated member.
  • the interface (contact area) between the elongated member and the transverse lamella is therefore relatively large.
  • neighboring transverse lamellae are mutually connected by longitudinal lamellae extending in a longitudinal plane, i.e. a plane parallel to the longitudinal axis of the elongated member.
  • longitudinal lamellae increase the interface area with the surrounding environmental air, so that heat dissipation is improved.
  • longitudinal lamellae can block light radiation in undesired directions.
  • a longitudinal lamella preferably extends in a longitudinal plane comprising the longitudinal axis of the elongated member.
  • the longitudinal lamellae are connected with the elongated member in order to improve the transport of heat to these longitudinal lamellae.
  • At least a portion of the surface of the transverse lamellae and/or a portion of the surface of the longitudinal lamellae is light- reflecting, so that the light radiation of the lamp towards the desired area is improved.
  • the angle between the reflected light radiation and the radial direction will decrease.
  • the surface of the lamellae may diffuse the reflected light radiation.
  • Fig. 1 shows a first embodiment of the lamp
  • Fig. 2 is a view along arrow II in Figure 1;
  • Fig. 3 is a sectional view along arrows III in Figure 1;
  • Fig. 4 shows a second embodiment of the lamp;
  • Fig. 5 is a sectional view of a third embodiment of the lamp;
  • Fig. 6 is a view along arrow VI in Figure 5; and
  • Fig. 7 is a sectional view along arrows VII in Figure 5.
  • the first embodiment of the lamp shown in Figures 1 to 3, comprises an elongated member 1 provided with sixteen LEDs 2, arranged in an array.
  • the elongated member is also provided with five transverse lamellae 3 having a circular outer edge 4 and being attached to the elongated member 1 at their inner edge.
  • the elongated member 1 and the transverse lamellae are made of aluminum.
  • the elongated member has a diameter of about 10 mm, while the transverse lamellae 3 have an outer diameter of about 35 mm and a thickness of about 1.5 mm. Between the transverse lamellae 3, the elongated member 1 has flat side surfaces 5 on which the LEDs 2 are mounted.
  • the elongated member 1 is a heat pipe comprising a sealed space 6 extending through a major portion of its length.
  • the space 6 contains a relatively small quantity of a working fluid such as water, ammonia or ethanol, while the remainder of the pipe is filled with the vapor phase of the working fluid.
  • Figure 4 shows a second embodiment of the lamp in the same view as in
  • the thickness of the transverse lamellae 3 decreases in the radial direction away from the elongated member 1.
  • the five transverse lamellae 3 thus taper from their inner edge to their outer edge 4.
  • the elongated member 1 of the second embodiment may be a heat pipe or a simple bar made of aluminum with flat surfaces 5 between every two neighboring lamellae 3.
  • Figures 5 to 7 show a third embodiment of the lamp provided with five transverse lamellae 3 and eight longitudinal lamellae 7.
  • the longitudinal lamellae 7 extend in a longitudinal plane in the radial direction with respect to the elongated bar-shaped member 1, as is shown in Figure 7.
  • the flat surface 5 on which the LEDs 2 are mounted extends between every two neighboring longitudinal lamellae 7.
  • the longitudinal lamellae 7 may be made of any thermally conductive material, which may be the same as the material of the transverse lamellae 3, but may also be a different material.
  • the material may be a metal or a ceramic material.
  • portions of the surfaces of the transverse lamellae 3 and/or portions of the surfaces of the longitudinal lamellae 7 may be provided with a light-reflecting coating in order to reflect light radiation from the LEDs 2.
  • Electric current-supply means for transporting electric power to the LEDs 2 are not represented in the Figures, and the same applies to means for attaching the lamp in a lamp holder. Such means are known per se.
  • the three described embodiments are only examples of an elongated lamp comprising LEDs and radially extending lamellae according to the invention. Many other embodiments are possible, for example, embodiments provided with transverse lamellae extending in directions other than the radial direction shown in Figure 7. LIST OF REFERENCE NUMERALS
  • LEDs light-emitting diodes

Abstract

La présente invention concerne une lampe comportant une pluralité de diodes électroluminescentes (2) montées sur un élément de forme allongée (1) conducteur de chaleur à distances mutuelles dans la direction axiale. L'élément de forme allongée (1) est muni d'une pluralité de lamelles transversales (3) réalisées en un matériau conducteur de chaleur. Chaque lamelle transversale (3) s'étend dans une plan radial par rapport à l'élément de forme allongée (1), des lamelles transversales (3) étant fixées à l'élément de forme allongée (1) entre les diodes électroluminescentes.
PCT/IB2008/051217 2007-04-06 2008-04-01 Lampe de forme allongée comportant des diodes électroluminescentes et des lamelles de prolongement radial WO2008122924A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP07105828 2007-04-06
EP07105828.3 2007-04-06

Publications (1)

Publication Number Publication Date
WO2008122924A1 true WO2008122924A1 (fr) 2008-10-16

Family

ID=39591677

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2008/051217 WO2008122924A1 (fr) 2007-04-06 2008-04-01 Lampe de forme allongée comportant des diodes électroluminescentes et des lamelles de prolongement radial

Country Status (1)

Country Link
WO (1) WO2008122924A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011001329A1 (fr) * 2009-06-29 2011-01-06 Koninklijke Philips Electronics N.V. Luminaire à diode électroluminescente utilisant des écrans comme dissipateur de chaleur
EP2384410A1 (fr) * 2009-01-27 2011-11-09 Vishay Electronic GmbH Unité d'éclairage
EP2673560A2 (fr) * 2011-02-07 2013-12-18 Cree, Inc. Dispositif d'éclairage à semi-conducteurs comprenant un dissipateur thermique allongé

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040120152A1 (en) 2002-12-11 2004-06-24 Charles Bolta Light emitting diode (L.E.D.) lighting fixtures with emergency back-up and scotopic enhancement
DE202004013775U1 (de) * 2004-03-29 2004-11-18 Helmut Hund Gmbh Leuchte
EP1500868A2 (fr) * 2003-07-24 2005-01-26 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Module DEL pour phares de véhicule, et phare de véhicule
US20060001384A1 (en) * 2004-06-30 2006-01-05 Industrial Technology Research Institute LED lamp
US7079041B2 (en) * 2003-11-21 2006-07-18 Whelen Engineering Company, Inc. LED aircraft anticollision beacon
EP1762775A1 (fr) * 2005-09-07 2007-03-14 Audi Ag Dispositif d'éclairage

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040120152A1 (en) 2002-12-11 2004-06-24 Charles Bolta Light emitting diode (L.E.D.) lighting fixtures with emergency back-up and scotopic enhancement
EP1500868A2 (fr) * 2003-07-24 2005-01-26 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Module DEL pour phares de véhicule, et phare de véhicule
US7079041B2 (en) * 2003-11-21 2006-07-18 Whelen Engineering Company, Inc. LED aircraft anticollision beacon
DE202004013775U1 (de) * 2004-03-29 2004-11-18 Helmut Hund Gmbh Leuchte
US20060001384A1 (en) * 2004-06-30 2006-01-05 Industrial Technology Research Institute LED lamp
EP1762775A1 (fr) * 2005-09-07 2007-03-14 Audi Ag Dispositif d'éclairage

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2384410A1 (fr) * 2009-01-27 2011-11-09 Vishay Electronic GmbH Unité d'éclairage
US9000346B2 (en) 2009-01-27 2015-04-07 Vishay Electronic Gmbh Illumination unit
WO2011001329A1 (fr) * 2009-06-29 2011-01-06 Koninklijke Philips Electronics N.V. Luminaire à diode électroluminescente utilisant des écrans comme dissipateur de chaleur
EP2673560A2 (fr) * 2011-02-07 2013-12-18 Cree, Inc. Dispositif d'éclairage à semi-conducteurs comprenant un dissipateur thermique allongé
CN103477149A (zh) * 2011-02-07 2013-12-25 克利公司 具有细长的散热器的固态照明装置
EP2673560A4 (fr) * 2011-02-07 2015-04-15 Cree Inc Dispositif d'éclairage à semi-conducteurs comprenant un dissipateur thermique allongé

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