EP3211293B1 - Vorrichtung zur wärmeableitung für eine leuchtvorrichtung eines kraftfahrzeugs - Google Patents

Vorrichtung zur wärmeableitung für eine leuchtvorrichtung eines kraftfahrzeugs Download PDF

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Publication number
EP3211293B1
EP3211293B1 EP17156709.2A EP17156709A EP3211293B1 EP 3211293 B1 EP3211293 B1 EP 3211293B1 EP 17156709 A EP17156709 A EP 17156709A EP 3211293 B1 EP3211293 B1 EP 3211293B1
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EP
European Patent Office
Prior art keywords
printed circuit
metal support
crimping
heat dissipation
support
Prior art date
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Active
Application number
EP17156709.2A
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English (en)
French (fr)
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EP3211293A1 (de
Inventor
Olivier Badia
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 Vision SAS
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Valeo Vision SAS
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Publication date
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Publication of EP3211293A1 publication Critical patent/EP3211293A1/de
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Classifications

    • 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
    • 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
    • F21S41/19—Attachment of light sources or lamp holders
    • F21S41/192—Details of lamp holders, terminals or connectors
    • 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
    • F21S45/49—Attachment of the cooling means
    • 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
    • F21S45/50—Waterproofing
    • 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
    • F21V17/00—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages
    • F21V17/10—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening
    • F21V17/14—Bayonet-type fastening
    • 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
    • F21V19/00—Fastening of light sources or lamp holders
    • F21V19/001—Fastening of light sources or lamp holders the light sources being semiconductors devices, e.g. LEDs
    • F21V19/003—Fastening of light source holders, e.g. of circuit boards or substrates holding light sources
    • F21V19/005—Fastening of light source holders, e.g. of circuit boards or substrates holding light sources by permanent fixing means, e.g. gluing, riveting or embedding in a potting compound
    • 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
    • F21V29/508—Cooling arrangements characterised by the adaptation for cooling of specific components of electrical circuits
    • 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 invention relates to the field of lighting and light signaling of motor vehicles.
  • the invention relates to a luminous device for a vehicle comprising a heat dissipation device and its mechanical attachment to a printed circuit.
  • LED is a semiconductor component, which, when traversed by an electric current of a predetermined intensity, emits light rays.
  • a luminous flux of a predetermined intensity generally related to the intensity of the electric current passing through the LED, can then be measured.
  • LED technology makes it possible on the one hand to reduce the electrical energy requirements of lighting and/or signaling devices, and on the other hand it allows vehicle manufacturers to create interesting and individual optical signatures.
  • a plurality of LEDs can for example be arranged along a curvilinear outline.
  • WO 2014/056834 A1 describes a known luminous device comprising a heat dissipation device on which a printed circuit is fixed.
  • the LEDs are on a printed circuit which is advantageously connected to means for powering the LEDs.
  • the circuit board is usually covered with a case.
  • heat dissipation elements are fashioned from Aluminum, which is a relatively expensive material.
  • the use of thick sheets with the aim of obtaining, by stamping, pins of an adequate height to hold a printed circuit therefore generates on the one hand a cost and on the other hand a significant weight.
  • a significant sheet thickness is required in order to be able to extract a pin of adequate dimensions by stamping.
  • the object of the invention is to overcome at least one of the problems posed by the prior art.
  • the subject of the invention is a luminous device as defined in claim 1.
  • the heat dissipation device comprises a metal support comprising at least one support portion of generally flat shape and at least one crimping pin intended to fix a printed circuit of the luminous device on said support.
  • the heat dissipation device is remarkable in that said pin is fixed in a sealed manner to a first face of the support by brazing.
  • the fixing of the pin is preferably carried out on the support portion of generally planar shape.
  • the metal support is generally flat in shape.
  • the metal support may have a thickness which is less than the height of the pin measured with respect to said first face of the support.
  • the printed circuit may be of the molded printed circuit, MID (“moulded interconnect device”) type.
  • the printed circuit may be of the flexible printed circuit type, FPCB (“Flexible Printed Circuit Board”).
  • the pin may preferably have a length, corresponding to its height relative to the support to which it is fixed, which is greater than the thickness of the printed circuit that it is intended to fix to the support.
  • the support can preferably have a thickness of less than 2.5 mm.
  • the metal support may preferably be aluminum.
  • the support and the pin can be made of identical materials.
  • the support and the pin can be made of different metallic materials.
  • Cooling fins can preferably be fixed to a second face of the support by brazing. Alternatively, cooling fins can be fixed to the first face of the support by brazing.
  • a clearance is preserved between the peg and the face of the metal support, in order to avoid possible degradation of the solder during subsequent crimping of the peg.
  • the crimping step comprises, according to the invention, a step of bringing at least one electrical track of the printed circuit into electrical contact with the crimping pin, in order to connect said electrical track to the electrical ground potential.
  • the printed circuit may comprise at least one light source of the light device. It may for example be a light source with a semiconductor element such as a light emitting diode, LED.
  • the printed circuit may alternatively comprise a circuit for controlling the supply of at least one light source of the light device.
  • the numbers 100, 200 describe for example a dissipation device in two different embodiments in accordance with the invention.
  • the brazing of metals is a permanent assembly process known per se in the state of the art, which makes it possible to establish a metallic continuity between the joined parts.
  • the brazing mechanism is atomic diffusion/migration on either side of the edges to be joined, obtained by heat action. Unlike welding, the joined edges are not melted during the brazing process.
  • brazing is carried out using a filler metal or a brazing product, the melting temperature of which is lower than that of the parts to be assembled.
  • the choice of such a material is within the reach of those skilled in the art.
  • an alloy of aluminum and silicon can for example be used as filler metal.
  • the melting temperature of such an alloy is between 570°C and 625°C.
  • the parts to be assembled can be made of different metals or of the same metal.
  • the brazing temperature is lower than the melting temperature of the parts to be assembled, but higher than the melting temperature of the filler metal.
  • Brazing makes it possible to produce tight joints between the assembled parts, the final assembly having metallurgical and thermal continuity.
  • the assembly of multiple parts can also be carried out in parallel in a furnace.
  • local heat input can be used to make a brazed joint.
  • the parts to be assembled should preferably be clean and free of surface oxides, in order to guarantee the brazing effect.
  • FIG. 1 shows a thermal device 100 according to the invention for a light device of a motor vehicle.
  • the light device further comprises a printed circuit 10 which supports a power supply control circuit for light sources, for example light-emitting diodes LED.
  • the power supply control circuit generally involves a converter circuit and produces heat.
  • the figure also shows a housing 12 which covers the printed circuit, and which makes a tight seal with the edge of the heat dissipation device.
  • the printed circuit comprises an opening through which passes a crimping pin 120 fixed to a portion of the face 112 of the support 110 of the heat dissipation device, said surface portion being generally planar.
  • the crimping pin is fixed to the support 110 by brazing. It is used to maintain the printed circuit in a predetermined position by the location of the pins and the corresponding openings of the printed circuit.
  • the opposite face 114 of the support 110 can accommodate cooling fins 130 in order to increase the surface of the heat dissipation device which is in contact with the ambient air, thus facilitating the exchange of heat .
  • the fins are advantageously fixed to the support 110 by brazing.
  • a support 110 of a small thickness either less than 2.5 mm, less than 1.5 mm, or for example 1 mm.
  • the height of the pins 120 on the side 112 is chosen independently of the thickness of the support or of the piece of aluminum sheet 110.
  • the height of the pins 120 must be large enough for the pins to pass through the openings provided in the circuit printed and stand out to allow the fixing of the printed circuit by crimping the pins.
  • the height of the pins 120 can for example be at least 2.5 mm relative to the face 112 of the support 110.
  • the base thereof In order to be able to carry out the crimping, during which a significant mechanical stress is applied to the pin, the base thereof must be aligned with the plane of the support 110.
  • FIG. 2 shows a preferred embodiment of the heat dissipation device 200 according to the invention.
  • the face 212 which supports the printed circuit 20 is shown.
  • Crimping pegs 220 have been attached to the generally planar support 210. These pegs are used to hold the printed circuit in a predetermined position, passing through openings in the printed circuit provided for this purpose, before being crimped.
  • a second set of crimping pins 222 is provided to fix thereto a casing which can cover the printed circuit in a sealed manner.
  • picture 3 shows the same embodiment as the figure 2 , however the opposite face 214 of device 200 is shown.
  • the pegs 220, 222 in this embodiment pass through an opening in the support 210 and comprise a shoulder which rests on a face 214 of the support 210.
  • This arrangement facilitates the alignment of the pegs with respect to the flat support 210. Pins having a shoulder at one end are inserted into the openings of the support 210 provided for this purpose until the shoulder comes into contact with the face 214. In this position the pins are oriented perpendicularly relative to the support and can be brazed to assemble the parts in question.
  • the crimping of the pins can advantageously create electrical contact between the upper face of the printed circuit, which does not face the support 110, 210 of the device, and the heat dissipation device itself, which represents usually zero electric potential or ground.
  • an electrical track of the circuit includes the edges of an opening in the printed circuit through which one of the crimping pins passes, this contact is used to connect the electrical track in question to ground potential.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Claims (7)

  1. Leuchtvorrichtung für ein Kraftfahrzeug, die Folgendes beinhaltet:
    - eine Leiterplatte (10), die eine Schaltung zur Ansteuerung der Versorgung von Lichtquellen trägt; und
    - eine Vorrichtung zur Wärmeableitung (100, 200), die Folgendes beinhaltet:
    • einen metallenen Träger (110, 210), der mindestens einen Trägerabschnitt mit einer im Wesentlichen ebenen Form beinhaltet; und
    • mindestens einen Crimpstift (120, 220), der auf einer ersten Seite (112, 212) des metallenen Trägers (110, 210) befestigt ist,
    dadurch gekennzeichnet, dass der Crimpstift (120, 220) durch Löten befestigt ist, um eine dichte Verbindung zwischen dem Crimpstift (120, 220) und dem metallenen Träger (110, 210) herzustellen;
    und dass die Leiterplatte (10, 20) mit Hilfe des Crimpstifts (120, 220) an dem metallenen Träger (110, 210) befestigt ist.
  2. Leuchtvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der metallene Träger (110, 210) eine Dicke aufweist, die kleiner ist als die Höhe des Crimpstifts (120, 220), die in Bezug auf die erste Seite (112, 212) des metallenen Trägers (110, 210) gemessen wird.
  3. Leuchtvorrichtung nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass der metallene Träger (110, 210) eine Dicke kleiner als 2,5 mm aufweist.
  4. Leuchtvorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der metallene Träger (110, 210) aus Aluminium ist.
  5. Leuchtvorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der metallene Träger (110, 210) und der Crimpstift (120, 220) aus identischen Materialien sind.
  6. Leuchtvorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass auf einer zweiten Seite (114) des metallenen Trägers (110, 210) Kühlrippen (130) durch Löten befestigt sind.
  7. Verfahren für die Montage der Leiterplatte (10, 20) auf der Vorrichtung zur Wärmeableitung (100, 200) der Leuchtvorrichtung für ein Kraftfahrzeug nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass das Verfahren die folgenden Schritte beinhaltet:
    - Ausrichten mindestens einer Öffnung der Leiterplatte (10, 20) in Bezug auf mindestens einen Crimpstift (120, 220) der Vorrichtung zur Wärmeableitung (100, 200);
    - Aufsetzen der Leiterplatte (10, 20) auf den metallenen Träger (110, 210) der Vorrichtung zur Wärmeableitung (100, 200), sodass der Crimpstift (120, 220) durch die Öffnung hindurchgeht;
    - Crimpen (120, 220) des Stifts, um die Leiterplatte (10, 20) an der Vorrichtung zur Wärmeableitung (100, 200) zu befestigen, wobei der Schritt des Crimpens (120, 220) den Schritt des elektrischen In-Kontakt-Bringens mindestens einer elektrischen Leiterbahn der Leiterplatte (10, 20) mit dem Crimpstift (120, 220) beinhaltet, um die elektrische Leiterbahn mit dem elektrischen Massepotenzial zu verbinden.
EP17156709.2A 2016-02-23 2017-02-17 Vorrichtung zur wärmeableitung für eine leuchtvorrichtung eines kraftfahrzeugs Active EP3211293B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1651471A FR3048062B1 (fr) 2016-02-23 2016-02-23 Dispositif de dissipation thermique pour un dispositif lumineux d'un vehicule automobile

Publications (2)

Publication Number Publication Date
EP3211293A1 EP3211293A1 (de) 2017-08-30
EP3211293B1 true EP3211293B1 (de) 2023-04-05

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US (1) US20170241618A1 (de)
EP (1) EP3211293B1 (de)
CN (1) CN107101179B (de)
FR (1) FR3048062B1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3074881B1 (fr) * 2017-12-07 2025-08-01 Valeo Vision Module lumineux pour vehicule automobile
DE102018009292A1 (de) * 2018-11-26 2020-05-28 Harting Ag Elektrooptische Baugruppe mit Wärmeabführung sowie Verfahren zur Herstellung einer solchen Baugruppe
FR3104678B1 (fr) 2019-12-11 2021-12-10 Valeo Vision Dispositif lumineux d’un véhicule automobile
CN119713177A (zh) * 2023-09-28 2025-03-28 市光法雷奥（佛山）汽车照明系统有限公司 出光模块、车灯组件和机动车辆

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US6749105B2 (en) * 2002-03-21 2004-06-15 Motorola, Inc. Method and apparatus for securing a metallic substrate to a metallic housing
JP2006128652A (ja) * 2004-09-29 2006-05-18 Furukawa Electric Co Ltd:The 発光部品搭載フラットケーブルの固定構造
DE102007002839A1 (de) * 2006-09-08 2008-03-27 Robert Bosch Gmbh Leuchtaggregat mit mehreren LED-Bauelementen und Verfahren zu seiner Herstellung
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Also Published As

Publication number Publication date
CN107101179A (zh) 2017-08-29
CN107101179B (zh) 2021-12-03
US20170241618A1 (en) 2017-08-24
FR3048062B1 (fr) 2018-03-09
EP3211293A1 (de) 2017-08-30
FR3048062A1 (fr) 2017-08-25

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