EP2711625A1 - Dispositif d'éclairage - Google Patents

Dispositif d'éclairage Download PDF

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Publication number
EP2711625A1
EP2711625A1 EP13185134.7A EP13185134A EP2711625A1 EP 2711625 A1 EP2711625 A1 EP 2711625A1 EP 13185134 A EP13185134 A EP 13185134A EP 2711625 A1 EP2711625 A1 EP 2711625A1
Authority
EP
European Patent Office
Prior art keywords
heat
light
light apparatus
transparent portion
transferring medium
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.)
Granted
Application number
EP13185134.7A
Other languages
German (de)
English (en)
Other versions
EP2711625B1 (fr
Inventor
Hans WIKSTRÖM
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.)
Scania CV AB
Original Assignee
Scania CV AB
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Filing date
Publication date
Application filed by Scania CV AB filed Critical Scania CV AB
Publication of EP2711625A1 publication Critical patent/EP2711625A1/fr
Application granted granted Critical
Publication of EP2711625B1 publication Critical patent/EP2711625B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F21V29/90—Heating arrangements
    • 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
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/143—Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/60—Heating of lighting devices, e.g. for demisting
    • 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
    • F21V29/506—Cooling arrangements characterised by the adaptation for cooling of specific components of globes, bowls or cover glasses
    • 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
    • F21V31/00—Gas-tight or water-tight arrangements
    • F21V31/03—Gas-tight or water-tight arrangements with provision for venting
    • 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
    • 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
    • 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 concerns a lighting apparatus according to the preamble to the independent claim, and in particular a light apparatus comprising a heating system arranged so as to heat a transparent portion of the lighting apparatus.
  • Vehicle lights traditionally have a lamp housing with a light-emitting source in the form of incandescent bulbs or xenon bulbs.
  • a light-emitting source in the form of incandescent bulbs or xenon bulbs.
  • One advantage of this type of light is that, in wintertime, the radiant heat from these light sources is used to heat the lens so that the formation of mist and ice is counteracted.
  • the heating of a lens for a vehicle light is known from, for instance, US-2010/0296308 , which concerns a headlight for a vehicle in which a so-called heat-pipe system is used to heat the lens.
  • the heat is conducted from the bulb to the lens by means of a heat pipe and then transferred to a heat-generating element disposed in the lamp housing. There the heat from the heat-generating element causes a hot airflow that heats the lens in order to, for example, melt snow on the outside.
  • a so-called heat-pipe system is generally a closed pipe with a medium within.
  • the pressure in the pipe is such that the medium is vaporized at a suitable temperature (for example just above room temperature) and the pipe can thus be used to conduct heat efficiently, for example from electronics in computers, by moving heating from one end of the pipe to the other, where the possibilities for efficient cooling in a normal way are greater.
  • a heat-pipe system is also used to transport heat from vacuum tube solar collectors to water-borne heat-conducting systems. In a heat-pipe system the heat can only be transported in one direction from below, whereupon the fluid is vaporized upwards where the gas condenses in order to run down along the inside the pipe and be vaporized again.
  • a typical heat-pipe system consists of a closed pipe made of a material with high thermal conductivity, such as copper or aluminum.
  • the pipe is evacuated and partly filled with a suitable heat-transferring medium.
  • the medium has been chosen based on the area of application for the system. Examples of media are water, ethanol, acetone and mercury.
  • the pipes have been provided on the inside with a material that exhibits a capillary pressure for the medium that has been chosen.
  • the medium can consist of, for instance, sintered metal powder or furrows along the length of the pipe.
  • the object is to utilize the capillary force to return the condensed medium to the heated end. In some cases gravity may instead be used to return the condensed medium, and it can also be returned via a separate tube instead of the tube that is transferring the vaporized medium.
  • a heat-pipe system contains no moving parts, and typically requires no maintenance.
  • the materials chosen as heat-transferring media depend on the working temperatures that are relevant for a specific application.
  • methanol exhibits a working temperature range of 283-403 K
  • ethanol a temperature range of 273-403 K.
  • freons can also be suitable for use.
  • the object of the present invention is to provide an improved and simplified light apparatus in terms of reducing mist formation and ice formation on its transparent, translucent portion.
  • the heat is conducted from the socket of the light-emitting unit, e.g. the LED bulb, using the so-called heat-pipe principle, to the transparent portion (the lens) of the light apparatus.
  • a suitable heat-conducting medium liquid/gas
  • the steam is conducted downward via essentially vertical channels while it condenses and thus emits heat.
  • the liquid is then conducted back to the hot socket, preferably by means of a capillary material in a second pipe, where it is vaporized again.
  • Heat is thereby conducted from the hot socket to the lens, which is then heated, and prevents misting and snow and ice formation on the lens.
  • this circulation is maintained by means of gravity and the capillary force.
  • Figure 1 is a schematic side view of a light apparatus 2 comprising one or a plurality of light-emitting units 4, preferably arranged in a housing (not shown), and a transparent portion 6 through which light 5 generated by said units is intended to pass.
  • the light-emitting units are, for example, LED lights and the light apparatus is preferably a vehicle light.
  • the light apparatus 2 further comprises a heating system 8 intended to conduct heat generated by the light-emitting unit(s) 4 by means of a heat-transferring medium 12 to the transparent portion 6 in order to heat same.
  • the heating system 8 comprises a conducting arrangement 10 arranged in direct connection to the transparent portion 6 and containing said heat-transferring medium 12, whereupon the heating system 8 is a closed system in which vaporization and condensation of the heat-transferring medium 12 occur.
  • medium in the vapor phase has been designated using broken arrows, medium in the liquid phase with solid arrows.
  • the heat that is generated in connection with condensation is utilized to heat said transparent portion 6 directly.
  • the heating system 8 functions according to the so-called heat-pipe principle.
  • the figures are schematic, and have been simplified in order to illustrate the invention as clearly as possibly; for example, naturally there is also often some type of housing (lamp housing) that supports the components involved.
  • the conducting arrangement has thus been adapted so that the heat-transferring medium heats the transparent portion directly.
  • the conducting arrangement 10 comprises, for example, conducting channels 11 that can, for example, consist of one or a plurality of separate pipes.
  • the conducting arrangement 10 is arranged on the inside of the transparent portion 6. This is illustrated schematically in Figure 1 .
  • the conducting arrangement 10 is arranged on the outside of the transparent portion 6. This is illustrated schematically in Figure 5 .
  • the conducting arrangement 10 is arranged so that it is integrated into the transparent portion 6. This is illustrated schematically in Figure 4 .
  • the conducting channels are designed in the transparent portion, no separate pipes are needed, but rather the conducting channels can be formed in connection with the fabrication of the transparent portion, for example in that the transparent portion is fabricated by joining two layers that are laminated together in such a way that the channels are formed by means of grooves in each respective layer that match up so that they form channels when joined. It is also possible to have the conducting channels consist of pipes that are cast in the transparent portion.
  • the transparent portion consist of a double-wall structure, i.e. two transparent walls with a gap between them through which the heat-transferring medium passes.
  • the conducting channels consist of one or a plurality of separate pipes.
  • the conducting channels can be likened to a network that is arranged so as to be uniformly distributed across the transparent portion in order to thereby distribute the heat uniformly.
  • the conducting channel can have, for example, a circular cross-section.
  • other cross-sections have proven to be more advantageous, wherein the surface that faces the part of the transparent portion that is to be heated the most, i.e. the outside, is larger. This can be achieved, for example, by designing the channel with a cross-section that is an isosceles or equilateral triangle, wherein the apex of the triangle is pointed toward the outside.
  • Another alternative is to have the cross-section be a semicircle, wherein the arc is pointed toward the outside.
  • the conducting channels in the transparent portion must be designed in such a way that the beam pattern is affected as little as possible. This means, for example, that the conducting channels have a maximum outer diameter that is relatively small, on the order of several millimeters.
  • the heating system 8 comprises a heat-absorbing part 14 arranged in connection with said light-emitting units 4 and containing said heat-transferring medium 12.
  • the purpose of the heat-absorbing part is to surround parts of the light-emitting unit 4, for example a socket for same, so that the heat-transferring medium can absorb as much heat as possible from the light-emitting unit 4.
  • the heat-absorbing part 14 is a closed container that is connected only to at least one first line 16 adapted so as to conduct said heat-transferring medium 12 from the heat-absorbing part 14 to the conducting arrangement 10, and to at least one second line 18 adapted so as to conduct said heat-transferring medium 12 from the conducting arrangement 10 back to the heat-absorbing part 14.
  • the first line 16 is preferably made of a material with low thermal conductivity, since as much of the heat as possible must be emitted to the transparent portion and not lost en route.
  • the heat emitted from the first line is further reduced by wholly or partly insulating all or parts of the outside of the first line 16 with an insulating layer 20; see the embodiment shown in Figure 2 .
  • FIG. 3 shows a front view of the light apparatus in which the vertical extent of the conducting channels has been marked.
  • the second line 18 contains a capillarily conductive material 22, as is depicted in the embodiment shown in Figure 2 .
  • the capillarily conductive material can, for example, consist of some form of metal wool or filter-like metal material. The reason why the capillarily conductive material is needed here is that the lower part of the transparent portion 6 is located below the heat-transferring part 14.
  • a capillarily conductive material can also be integrated into the conducting arrangement in the transparent portion, which offers the advantage that the conducting channels will then not need to be oriented vertically, but rather can be give an orientation suitable for achieving optimum effect. They can, for example, be arranged in suitable coils so as to thereby cover as large a part of the surface as possible.
  • Figure 6 shows a schematic side view of one embodiment in which no capillarily conductive material is needed, since the heat-transferring part 14 is located below the lowest part of the transparent portion, and the medium thus runs down to the heat-transferring part because of gravity.
  • a light design requires, for example, a mirror arrangement (not shown) in order to output the light.
  • the background portion of the description identifies a number of media that can serve as heat-transferring media, depending on the application, in this case the temperatures that are present at the light-emitting unit. In the case of LED bulbs the working temperature is in the range of 60-90 degrees Celsius.
  • the heat-transferring medium 12 can be butane or propane.
  • additional heat can be supplied to the socket of the unit by means of, for example, electricity, hot cooling fluid, hot charge air or exhaust gases.
  • Figure 7 shows a schematic side view of a light apparatus according to yet another embodiment of the present invention.
  • a combined line 24, i.e. only one line is used to carry the heat-transferring medium to and from the transparent portion 6.
  • the combined line 24 has preferably been equipped with a capillarily conductive material 22 and with an insulating layer 20.
  • the conducting arrangement has been disposed on the inside of the transparent portion 6; it is naturally possible to have it be integrated into or arranged on the outside of the portion 6.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
EP13185134.7A 2012-09-24 2013-09-19 Dispositif d'éclairage Active EP2711625B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1251074A SE536661C2 (sv) 2012-09-24 2012-09-24 Belysningsanordning

Publications (2)

Publication Number Publication Date
EP2711625A1 true EP2711625A1 (fr) 2014-03-26
EP2711625B1 EP2711625B1 (fr) 2017-05-24

Family

ID=49293440

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13185134.7A Active EP2711625B1 (fr) 2012-09-24 2013-09-19 Dispositif d'éclairage

Country Status (2)

Country Link
EP (1) EP2711625B1 (fr)
SE (1) SE536661C2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015197146A1 (fr) * 2014-06-27 2015-12-30 Daimler Ag Dispositif d'éclairage extérieur pour véhicule
WO2016045915A1 (fr) * 2014-09-23 2016-03-31 Osram Gmbh Dispositif de conversion de lumière avec échangeur à tube et ensemble lumineux à semi-conducteur avec dispositif de conversion de lumière
EP3851742A1 (fr) * 2020-01-17 2021-07-21 B/E Aerospace, Inc. Systèmes et procédés d'atténuation de la condensation dans l'éclairage d'aéronef

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007038911A1 (de) * 2007-08-17 2009-02-19 Osram Gesellschaft mit beschränkter Haftung Kühlvorrichtung und Beleuchtungseinrichtung
US20100296308A1 (en) 2008-01-17 2010-11-25 Takashi Ohsawa Vehicle headlamp
US20110305025A1 (en) * 2009-02-27 2011-12-15 Koninklijke Philips Electronics N.V. Led-based lamps and thermal management systems therefor

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006010977A1 (de) * 2006-02-01 2007-12-06 Osram Opto Semiconductors Gmbh Kfz-Scheinwerfer
JP2008135260A (ja) * 2006-11-28 2008-06-12 Matsushita Electric Ind Co Ltd 車両用前照灯
CN101358699B (zh) * 2007-08-01 2011-08-24 富士迈半导体精密工业（上海）有限公司 室外灯具
ATE532003T1 (de) * 2008-01-14 2011-11-15 Osram Ag Anordnung zur kühlung von halbleiterlichtquellen und scheinwerfer mit dieser anordnung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007038911A1 (de) * 2007-08-17 2009-02-19 Osram Gesellschaft mit beschränkter Haftung Kühlvorrichtung und Beleuchtungseinrichtung
US20100296308A1 (en) 2008-01-17 2010-11-25 Takashi Ohsawa Vehicle headlamp
US20110305025A1 (en) * 2009-02-27 2011-12-15 Koninklijke Philips Electronics N.V. Led-based lamps and thermal management systems therefor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015197146A1 (fr) * 2014-06-27 2015-12-30 Daimler Ag Dispositif d'éclairage extérieur pour véhicule
WO2016045915A1 (fr) * 2014-09-23 2016-03-31 Osram Gmbh Dispositif de conversion de lumière avec échangeur à tube et ensemble lumineux à semi-conducteur avec dispositif de conversion de lumière
EP3851742A1 (fr) * 2020-01-17 2021-07-21 B/E Aerospace, Inc. Systèmes et procédés d'atténuation de la condensation dans l'éclairage d'aéronef
US11104451B2 (en) 2020-01-17 2021-08-31 B/E Aerospace, Inc Systems and methods for mitigating condensation in aircraft lighting

Also Published As

Publication number Publication date
EP2711625B1 (fr) 2017-05-24
SE1251074A1 (sv) 2014-03-25
SE536661C2 (sv) 2014-05-06

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