EP3581849B1 - Dispositif de refroidissement pour un dispositif d'éclairage d'automobile et dispositif d'éclairage d'automobile - Google Patents

Dispositif de refroidissement pour un dispositif d'éclairage d'automobile et dispositif d'éclairage d'automobile Download PDF

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Publication number
EP3581849B1
EP3581849B1 EP18382422.6A EP18382422A EP3581849B1 EP 3581849 B1 EP3581849 B1 EP 3581849B1 EP 18382422 A EP18382422 A EP 18382422A EP 3581849 B1 EP3581849 B1 EP 3581849B1
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EP
European Patent Office
Prior art keywords
fins
lighting device
automotive lighting
light
sides
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.)
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Application number
EP18382422.6A
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German (de)
English (en)
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EP3581849A1 (fr
Inventor
Miguel-Angel LOBATO
Alvaro Andres
Francisco Ruiz
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.)
Valeo Iluminacion SA
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Valeo Iluminacion SA
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Priority to EP18382422.6A priority Critical patent/EP3581849B1/fr
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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
    • F21V29/70—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
    • 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
    • F21S45/40—Cooling of lighting devices
    • F21S45/47—Passive cooling, e.g. using fins, thermal conductive elements or openings
    • 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
    • F21V29/763—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 the direction of 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

Definitions

  • This invention is related to the field of heat dissipation in automotive lighting devices.
  • Light sources generate a big amount of heat which needs to be dissipated, so that the operation of said light sources is not jeopardized. This issue is even more important when light sources are light emitting diodes (LEDs), since temperature has a big impact on the operational properties of said light sources.
  • LEDs light emitting diodes
  • Heat sinks with fins are known to solve this problem.
  • a heat sink is located in thermal contact with the light source, and this heat sink is provided with fins, which dissipate the heat coming from the heat sink, so that air surrounding the fins is heated and then wasted.
  • a fan is also used to create a forced fluid flow which improves the thermal behaviour of this heat sink. Any improvement in the thermal performance of these elements is crucial, due to the small size of modern automotive lighting devices and the increasing number of individual LEDs which are usually used to achieve the different lighting and signalling functionalities.
  • the invention provides a solution for a heat dissipation arrangement which achieves a great thermal performance by means of an automotive lighting device according to claim 1.
  • the invention provides an automotive lighting device comprsing a cooling device comprising a heat sink intended to be in thermal contact with the light source, a plurality of fins in direct thermal contact with the heat sink, at least one light source arranged in thermal contact with the heat sink, wherein the cooling device comprises at least four fins, wherein each fin comprises a base in direct contact with the heat sink, the base comprising first and second sides parallel to a first direction and third and fourth sides shorter than the first and second sides, the third side being oriented according to a second direction forming an angle between 25° and 75° with respect to the first direction, wherein the four fins are arranged so that there is a passage parallel to the first direction between two of the four fins and the other two and there is a passage parallel to the second direction between two of the four fins and the other two.
  • the fourth side is parallel to the third side. This arrangement allows the secondary flow cross more easily the path created between two adjacent rows of fins.
  • the length of the first side is between 2 and 5 times the distance between the first and second sides.
  • the fins are slim enough so that a predetermined flow direction may be defined, as opposed to the case of pins.
  • these fins are not too slim, so that many secondary flows may be created between two adjacent rows of fins, thus improving the cooling behaviour of this device.
  • the heat sink and the plurality of fins are manufactured as a single piece by an injection moulding process.
  • the distance between the fourth side of the base of a fin and the third side of the base of the nearest fin is comprised between 3 and 10 mm.
  • adjacent fins are close enough so that the predetermined flow direction is defined but are not too close, so that the secondary flow is allowed to pass between two adjacent fins belonging to the same row.
  • the distance between a line which includes the first side of a fin and a line which includes the first side of the nearest fin is comprised between 0 and 5 mm.
  • the cooling device comprises at least four fins, each fin comprising first and second sides parallel to a first direction and third and fourth sides shorter than the first and second sides, the third side being oriented according to a second direction forming an angle between 25o and 75o with respect to the first direction, wherein the four fins are arranged so that there is a passage parallel to the first direction between two of the four fins and the other two and there is a passage parallel to the second direction between two of the four fins and the other two.
  • the cooling device further comprises a central continuous rib parallel to the first direction.
  • This continuous rib is intended to separate the cooling flows when more than one light source is to be cooled.
  • the cooling device comprises four fins at each side of the central rib, wherein in each group of four fins, each fin comprises a first and second sides parallel to a first direction and a third and fourth sides shorter than the first and second sides, the third side being oriented according to a second direction forming an angle between 25o and 75o with respect to the first direction, wherein the four fins are arranged so that there is a passage parallel to the first direction between two of the four fins and the other two and there is a passage parallel to the second direction between two of the four fins and the other two, and there is a further passage parallel to the first direction between two of the fins and the central continuous rib.
  • This embodiment combines a good thermal behaviour with the continuous rib, so that the thermal performance of the cooling device may be improved for each light source.
  • the plurality of fins have a top portion smaller than the base.
  • the at least one light source arranged in thermal contact with the heat sink requires a cooling effect. Heat is dissipated by the heat sink and communicated to the fins, where heat is transferred by convection to the surrounding air.
  • more than one light source may be arranged, and their heat may be dissipated by such a cooling device.
  • the automotive lighting device further comprises a first optical element arranged to receive light from the light source and to shape the light into a light pattern projected outside the lighting device.
  • An optical element is an element that has some optical properties to receive a light beam and emit it in a certain direction and/or shape, as a person skilled in automotive lighting would construe without any additional burden.
  • the optical element is at least one of a lens, a light guide, a reflector or a collimator.
  • optical elements are useful to manage the light produced by the light source and provide uniform outlet.
  • the optical element is configured to project light in a projection direction which is substantially perpendicular to the first direction.
  • the arrangement of such a lighting device has a influence on the heat dissipation.
  • Light is usually projected in a horizontal direction, and when the cooling device is arranged so that this projecting horizontal direction is perpendicular to the first direction, which is the direction of orientation of the main flow, it means that the first direction is vertical.
  • the cooling device is arranged so that the fins are oriented according to the vertical direction, natural convection helps to improve the thermal behaviour of this device.
  • the light source is a solid-state light source, and in particular a light emitting diode or LED.
  • solid state refers to light emitted by solid-state electroluminescence, which uses semiconductors to convert electricity into light. Compared to incandescent lighting, solid state lighting creates visible light with reduced heat generation and less energy dissipation.
  • the typically small mass of a solid-state electronic lighting device provides for greater resistance to shock and vibration compared to brittle glass tubes/bulbs and long, thin filament wires. They also eliminate filament evaporation, potentially increasing the life span of the illumination device.
  • Some examples of these types of lighting comprise semiconductor light-emitting diodes (LEDs), organic light-emitting diodes (OLED), or polymer light-emitting diodes (PLED) as sources of illumination rather than electrical filaments, plasma or gas.
  • FIG. 1 shows a perspective front view of a particular embodiment of a cooling device 1 according to the invention.
  • This cooling device 1 is intended to be part of a headlamp and comprises a heat sink 2 which is in thermal contact with a plurality of LEDs (not shown) which provide a light beam functionality.
  • This headlamp also comprises a lens (not shown), which is intended to receive the light produced by the LEDs and project it according to a projection direction dp.
  • FIG. 2 shows a cut view of such a cooling device 1, so that the elements contained in the cooling device 1 may be seen.
  • the heat sink 2 is in the background of this figure, and a plurality of fins 3 protrude from this heat sink 2, therefore being in thermal contact with it.
  • the fins 3 comprise a base in direct contact with the heat sink.
  • This base comprises a first side 31, a second side 32, a third side 33 and a fourth side 34.
  • the first side 31 and the second side 32 are parallel to a first direction d1
  • the third side 33 and the fourth side 34 are shorter than the first and second ones, and are oriented according to a second direction which forms an angle of substantially 40o with respect to the first direction d1.
  • the first direction d1 is substantially perpendicular to the projecting direction of the lens, so that this first direction d1 is substantially vertical when the cooling device is installed in a lighting device which is in turn in its operation position in an automotive vehicle.
  • This vertical arrangement is advantageous since natural convection creates the main flow 121.
  • the fins are elongated, the length according to the first and second sides is substantially 4 times the distance between these first and second sides so the fins define a main direction for the main cooling air flow 121.
  • the bevelled shape of the fins 3 induces a further secondary flow 122 according to a second direction d2 to mix with the main flow 121, thus improving the cooling efficiency.
  • the cooling device 1 further comprises a central continuous rib 4, which is parallel to the first direction.
  • This central continuous rib 4 divides the cooling flow, which is particularly useful in the event of more than one LED.
  • a secondary flow 122 is created between groups of fins 3, due to the passage created according to the second direction d2.
  • This cooling device makes it easy to be manufactured as a single piece by an injection moulding process.
  • Figure 3 shows a detail of the fins 3 arrangement of a cooling device according to the invention.
  • the distance between the fourth side 34 of the base of a fin and the third side 33' of the base of the nearest fin is comprised between 4 and 5 mm. This distance between two adjacent fins is important to let the secondary flow pass between the adjacent fins.
  • both lines 101, 102 may be coincident, and the fins be completely aligned, but this offset is sometimes advantageous to achieve a correct induction of the secondary flow.
  • FIG 4 shows the automotive lighting device 10 shown in the previous figures mounted on an automotive vehicle 100.
  • This lighting device 10 which provides a low beam functionality, may be equipped with powerful LEDs, the heat generated thereby being dissipated by the cooling device 1.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Claims (13)

  1. Un dispositif d'éclairage automobile (10) comprenant :
    - un dispositif de refroidissement (1) comprenant :
    un dissipateur thermique (2) destiné à être en contact thermique avec la source de lumière,
    une pluralité d'ailettes (3) en contact thermique direct avec le dissipateur thermique (2) ;
    - au moins une source de lumière (5) disposée en contact thermique avec le dissipateur thermique (2) ;
    dans lequel :
    - le dispositif de refroidissement comprend au moins quatre ailettes (3), caractérisé en ce que chaque ailette comprend une base en contact direct avec le dissipateur thermique, la base comprenant des premier (31) et deuxième (32) côtés parallèles à une première direction (d1) et des troisième (33) et quatrième (34) côtés plus courts que les premier (33) et deuxième (32) côtés, le troisième côté (33) étant orienté selon une deuxième direction (d2) formant un angle entre 25° et 75° par rapport à la première direction (d1), dans lequel les quatre ailettes sont disposées de sorte qu'il y ait un passage parallèle à la première direction entre deux des quatre ailettes et les deux autres et qu'il y ait un passage parallèle à la deuxième direction entre deux des quatre ailettes et les deux autres.
  2. Dispositif d'éclairage automobile (10) selon la revendication 1, dans lequel le quatrième côté (34) est parallèle au troisième côté (33).
  3. Dispositif d'éclairage automobile (10) selon l'une quelconque des revendications précédentes, dans lequel la longueur du premier côté (31) est comprise entre 2 et 5 fois la distance entre le premier (31) et le deuxième (32) côtés.
  4. Dispositif d'éclairage automobile (10) selon l'une quelconque des revendications précédentes, dans lequel le dissipateur thermique (2) et la pluralité d'ailettes (3) sont fabriqués en une seule pièce par un procédé de moulage par injection.
  5. Dispositif d'éclairage automobile (10) selon l'une quelconque des revendications précédentes, dans lequel la distance entre le quatrième côté de la base d'une ailette et le troisième côté de la base de l'ailette la plus proche est comprise entre 3 et 10 mm.
  6. Dispositif d'éclairage automobile (10) selon l'une quelconque des revendications précédentes, dans lequel la distance entre une ligne (101) qui comprend le premier côté d'une ailette et une ligne (102) qui comprend le premier côté de l'ailette la plus proche est comprise entre 0 et 5 mm.
  7. Dispositif d'éclairage automobile (10) selon l'une quelconque des revendications précédentes, dans lequel le dispositif de refroidissement (1) comprend en outre une nervure centrale continue (4) parallèle à la première direction (d1).
  8. Dispositif d'éclairage automobile (10) selon la revendication 7, comprenant en outre quatre ailettes de chaque côté de la nervure centrale, dans lequel dans chaque groupe de quatre ailettes, chaque ailette comprend des premier (31) et deuxième (32) côtés parallèles à une première direction (d1) et des troisième (33) et quatrième (34) côtés plus courts que les premier (33) et deuxième (32) côtés, le troisième côté (33) étant orienté selon une deuxième direction (d2) formant un angle entre 25° et 75° par rapport à la première direction (d1), dans lequel les quatre ailettes sont disposées de telle sorte qu'il existe un passage parallèle à la première direction entre deux des quatre ailettes et les deux autres et qu'il existe un passage parallèle à la deuxième direction entre deux des quatre ailettes et les deux autres, et qu'il existe un autre passage parallèle à la première direction entre deux des ailettes et la nervure centrale continue.
  9. Dispositif d'éclairage automobile (10) selon l'une quelconque des revendications précédentes, dans lequel la pluralité d'ailettes présente une partie supérieure plus petite que la base.
  10. Dispositif d'éclairage automobile (10) selon l'une quelconque des revendications précédentes, comprenant en outre un premier élément optique agencé pour recevoir de la lumière en provenance de la source de lumière (5) et pour façonner la lumière en un motif lumineux projeté à l'extérieur du dispositif d'éclairage (10).
  11. Dispositif d'éclairage automobile (10) selon la revendication 10, dans lequel l'élément optique est au moins un élément parmi une lentille, un guide de lumière, un réflecteur ou un collimateur.
  12. Dispositif d'éclairage automobile (10) selon l'une quelconque des revendications 10 ou 11, dans lequel l'élément optique est configuré pour projeter de la lumière dans une direction de projection (dp) qui est sensiblement perpendiculaire à la première direction (d1 ).
  13. Dispositif d'éclairage automobile (10) selon l'une quelconque des revendications 9 à 12, dans lequel la source de lumière (5) est une source lumineuse à semi-conducteurs, et notamment une diode électroluminescente ou LED.
EP18382422.6A 2018-06-14 2018-06-14 Dispositif de refroidissement pour un dispositif d'éclairage d'automobile et dispositif d'éclairage d'automobile Active EP3581849B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP18382422.6A EP3581849B1 (fr) 2018-06-14 2018-06-14 Dispositif de refroidissement pour un dispositif d'éclairage d'automobile et dispositif d'éclairage d'automobile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18382422.6A EP3581849B1 (fr) 2018-06-14 2018-06-14 Dispositif de refroidissement pour un dispositif d'éclairage d'automobile et dispositif d'éclairage d'automobile

Publications (2)

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EP3581849A1 EP3581849A1 (fr) 2019-12-18
EP3581849B1 true EP3581849B1 (fr) 2022-02-23

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160223183A1 (en) * 2015-02-03 2016-08-04 Xiaofeng Zou Led lamp

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5150278A (en) * 1991-04-16 1992-09-22 J. E. Thomas Specialties Limited Finned housing
US7535716B2 (en) * 2007-05-23 2009-05-19 Adc Telecommunications, Inc. Apparatus for enclosing electronic components used in telecommunication systems
JP4945433B2 (ja) * 2007-12-28 2012-06-06 シャープ株式会社 照明装置
JP5405043B2 (ja) * 2008-04-22 2014-02-05 株式会社小糸製作所 車両用灯具
WO2013153938A1 (fr) * 2012-04-11 2013-10-17 東芝ライテック株式会社 Source lumineuse à semi-conducteurs optiques, et appareil d'éclairage pour véhicule
WO2015186016A1 (fr) * 2014-06-03 2015-12-10 Koninklijke Philips N.V. Dissipateur thermique de luminaire

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160223183A1 (en) * 2015-02-03 2016-08-04 Xiaofeng Zou Led lamp

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