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EP3872395A1 - Module de lumière d'une unité d'éclairage de véhicule à moteur et procédé d'assemblage d'un module de lumière d'un véhicule à moteur - Google Patents

Module de lumière d'une unité d'éclairage de véhicule à moteur et procédé d'assemblage d'un module de lumière d'un véhicule à moteur Download PDF

Info

Publication number
EP3872395A1
EP3872395A1 EP20159862.0A EP20159862A EP3872395A1 EP 3872395 A1 EP3872395 A1 EP 3872395A1 EP 20159862 A EP20159862 A EP 20159862A EP 3872395 A1 EP3872395 A1 EP 3872395A1
Authority
EP
European Patent Office
Prior art keywords
optical element
heat sink
light
light module
light source
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.)
Pending
Application number
EP20159862.0A
Other languages
German (de)
English (en)
Inventor
Primo Petac
Denis KREBELJ
Valentin Novak
Jernej Marolt
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.)
Hella Saturnus Slovenija doo
Original Assignee
Hella Saturnus Slovenija doo
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 Hella Saturnus Slovenija doo filed Critical Hella Saturnus Slovenija doo
Priority to EP20159862.0A priority Critical patent/EP3872395A1/fr
Publication of EP3872395A1 publication Critical patent/EP3872395A1/fr
Pending legal-status Critical Current

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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
    • 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]
    • 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
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/39—Attachment thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/13—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source characterised by the type of light source
    • F21S43/14—Light emitting diodes [LED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/19—Attachment of light sources or lamp holders
    • F21S43/195—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
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/30—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by reflectors
    • F21S43/37—Attachment thereof
    • 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

Definitions

  • the present invention relates to a light module of a motor vehicle lighting unit.
  • the light module comprises at least one light source mounted on a socket which is in thermal contact with a heat sink, and an optical element for guiding light emitted by the light source, said optical element being at least indirectly fixed to the heat sink with a fastening element.
  • a light module for a motor vehicle various technical solutions for the implementation of a light module for a motor vehicle are known from the prior art.
  • these light modules are utilized for headlights as well as for the rear lights or other lighting units of a motor vehicle.
  • light modules for headlights of motor vehicles must be adjusted in order to prevent oncoming drivers from being dazzled.
  • a housing of a motor vehicle lighting unit comprises at least one adjustment element to adjust the light source and/or the optical element of the light module with respect to an optical axis and a fastening element to fix the movable components in the required position.
  • EP 3 428 512 A1 describes a light module of a motor vehicle lighting unit which comprises at least one light source mounted and electrically contacted on a circuit board. Furthermore, the light module comprises an optical element for guiding light emitted by the light source. The light source and the optical element are attached to a heat sink serving as a cooling element to dissipate heat generated by the light source.
  • the heat sink comprises a sheet metal part bent around at least one banding axis as a cooling body.
  • This sheet metal consists of a stationary and a movable part and the light source as well as the optical element are mounted on the movable part, which can be moved relative to the stationary part in order to adjust the light source and the optical element.
  • the adjustment element comprises a screw with a coil spring to adjust the orientation of the cooling body by deformation of the sheet metal part.
  • US 2014/0268834 A1 describes a device for mounting light sources on a substrate.
  • the device includes a mounting frame having a general channel-like shape and defines a cavity in which the light source is mounted.
  • the frame with the light source is attached to a substrate by a fastening element comprising preferably four screws extending from the frame to engage a threaded hole provided on the surface of the substrate.
  • the screws are arranged in coil springs in such a way that the force pressing the frame against the substrate can be regulated.
  • a frame holding a light source can be attached to a substrate using a screw as well as a screw in order to realize a more uniform distribution of pressure between the frame and the substrate.
  • Another important object of the invention refers to the adjustment of the optical element.
  • a light module according to the invention especially by utilizing a specific fastening element, it should be ensured, that during use of a motor vehicle the optical element is always in the correct position as well with regard to the light source as to the optical axis off the lighting unit.
  • another important object of the invention is to make sure, that the lighting unit of a motor vehicle emits light along its optical axis in order to prevent oncoming drivers from being dazzled.
  • claim 11 provides an implementation of a light module according to the invention in a motor vehicle lighting unit. Furthermore, the invention is realized by a method for assembling a light module according to claim 12.
  • a light module of a motor vehicle lighting unit comprises at least one light source mounted on a socket, which is in thermal contact with a heat sink, and an optical element for guiding light emitted by the light source, said optical element being at least indirectly fixed to the heat sink by a fastening element.
  • the proposed light module is characterized in that the fastening element is in a mounted state partially located in the heat sink and in that between the fastening element and the optical element an elastic spacer is arranged in such a way, that in the mounted state, when the optical element is fixed to the heat sink, a pressing force is transmitted from the fastening element via said elastic spacer into the optical element and the socket.
  • the invention is based on the main idea, that there is a connection between the optical element of a light module and the heat sink without any direct contact between these elements.
  • the elastic spacer is arranged between the fastening element and the optical element as to make sure that a pressing force, which is transmitted from the fastening element into the optical element, is not directly introduced into the optical element.
  • the optical element is not deformed even if the fastening element is overtightened.
  • the optical element is fastened to the heat sink in such a way, that the position of the optical element relative to the light source remains unchanged. This is achieved because the pressing force is transmitted from the fastening element via the optical element into the socket, which is on the opposite side in contact with the heat sink.
  • the fastening element extends as well through the optical element as the socket on which the light source is mounted and fixes both components to the heat sick in a defined position. With its surface being opposite to the optical element the socket is in contact with the heat sink.
  • At least an area of the optical element in a mounted state is directly pressed against one surface of the socket.
  • at least one additional component and/or layer is arranged between the optical element and the socket. In any case a pressing force introduced in a mounted state from the fastening element is transmitted from the optical element into the socket.
  • the elastic spacer comprises a spring element, preferably a coil spring or a cup spring.
  • the elastic element comprises an elastic sleeve or foam, which is arranged between the fastening element and the optical element and which is in a mounted state at least partially compressed due to the pressing force applied thereto.
  • the elastic element can be fixed to the fastening element or be realized as a separate part.
  • the elastic spacer which is arranged between the fastening element and the optical element comprises a coil spring which is at least partially compressed, when the fastening element is tightened, whereby at least one portion of the fastening element extend through the interior cavity of the coil spring.
  • the fastening element is a rivet or a screw, which can be inserted at least partially into the heat sink. If the fastening element comprises a screw this screw engages a threaded hole located in the heat sink while it is tightened and/or in a mounted state. According to this technical solution the pressing force is transmitted from the screw head to the elastic spacer, which then is at least partially compressed.
  • the light source comprises at least one semiconductor light source.
  • this light source comprises at least one LED, one OLED and/or one laser diode.
  • the light source comprises at least one optical waveguide or is connected to an optical waveguide which directs light from a luminaire, which for example could be located somewhere else in a motor vehicle, to the light source emitting the light to the surroundings, especially via the optical element.
  • a waveguide output is utilized as light source of the light module.
  • the optical element is a reflector which redirects light emitted by the light source and ensures that at least most of the light emitted by the light source is directed to the road in front of the motor vehicle.
  • the waveguide can either be fastened to the socket or be integrated into the socket.
  • the socket comprises at least one circuit board, advantageously a printed circuit board (PCB).
  • the light source arranged on such a circuit board is as well attached to the circuit board as optically and/or electrically contacted on the circuit board.
  • the light source is a semiconductor light source, like a LED or an OLED, which is integrated into an electronic circuit arranged on said circuit board.
  • at least one optical wave guide can be arranged on the circuit board and at least partially direct light to the light source.
  • an optical waveguide is at least partially integrated into the circuit board of the light module for motor vehicle lighting.
  • the invention further relates to a lighting unit of a motor vehicle comprising at least one light module, which is realized in accordance with at least one of the previously described embodiments.
  • a light module according to the invention is implemented in a headlight, a rear light, a turn-signal light and/or a reversing light of a motor vehicle.
  • Another aspect of the invention relates to a method for assembling a light module of a motor vehicle. Under this method at least one light source is mounted on a socket, said socket is brought in contact with a heat sink and an optical element for guiding light emitted by the light source together with the socket is fixed to the heat sink with the help of a fastening element.
  • the method according to the invention is characterized in that an elastic spacer is arranged between the fastening element and the optical element and in that the optical element is fixed to the heat sink as the fastening element is partially inserted into the heat sink in such a way that the pressing force is transmitted from the fastening element via said elastic spacer into the optical element and the socket.
  • a light module suitable for a motor vehicle is manufactured without the risk, that the optical element is damaged or is not in a correct position with respect to the light source and/or the optical axis of the light module.
  • the optical element as the light source of the light module mounted on the socket are attached to the heat sink in such a way, that their relative position remains unchanged although heat load and/or thermal or mechanical stresses are introduced into these elements.
  • the assembling method is characterized in that a shaft of a screw which is utilized as fastening element is put through the interior of a coil spring used as elastic spacer before said screw is screwed into the heat sink.
  • a connection between the fastening element and the optical element is realized although there is no direct contact between the fastening element and the optical element.
  • an elastic spacer between the fastening element and the optical element pressing forces transmitted from the fastening element into the optical element are distributed evenly over the surface of the optical element. Therefore, the risk of causing mechanical damage to the surface of the optical element is excluded, at least considerably minimized.
  • Fig. 1 shows a sectional view of a light module 1 according to the invention, which is utilized for the headlight of a motor vehicle.
  • the main components of the light module1 are a light source 2 mounted on a socket 3, an optical element 5 in form of a reflector for guiding light emitted by the light source 2, a heat sink 4 for dissipating heat generated by the light source 2 and a fastening element 6 for fixing the optical element 5 on the heat sink 4.
  • the heat sink 4 avoids overheating and therefore a heat-related reduction of the efficiency of the light module 1.
  • the socket 3 is made as a circuit board, arranged between the fastening area 8 of the optical element 5 and the heat sink 4.
  • the fastening element 6 comprises a screw 9, which extends through a hole 13, 14 as well in the optical element 5 as in the circuit board and which engages into a thread hole 12 in the surface of the heat sink 4.
  • the socket 3 is made as circuit board, also called printed circuit board (PCB), a light emitting diode (LED) as light source 2 is mounted on the circuit board, which is arranged directly on the heat sink 4 in order to ensure a good thermal contact between the circuit board and the heat sink 4.
  • the fastening area 8 of the optical element 5 is arranged, which according to this embodiment is a reflector of a motor vehicle headlight.
  • a screw 9 as fastening element 6 is provided for fixing the optical element 5 and the circuit board on the heat sink 4 .
  • the screw 9 is screwed into the threaded hole 12 of the heat sink 4.
  • an elastic spacer 7 realized by a coil spring is arranged between the screw head 11 of the screw 9 and the top side of the fastening area 8 of the optical element 5.
  • the screw 9 When the screw 9 is tightened it is compressed and an increasing pressing force is transmitted from the screw head 11 via the coil spring into the top surface of the optical element 5. A final pressing force is achieved, when the screw shaft 10 gets in contact with the heat sink 4.
  • the use of the coil spring as an elastic spacer 7 between the screw head 11 and the optical element 5 ensures that the optical element 5 as well as the circuit board are well fixed on the heat sink 4.
  • the optical element 5 in case thermal loads caused by the light source 2 are introduced into the optical element 5 sufficient movements of the optical element 5 are still possible whereby thermal stress and appropriate damage to the optical element 5 are avoided.
  • the screw 9 is overtightened the optical element 5 would not be damaged.
  • Fig. 2 shows a detailed view of the fastening according to the invention.
  • a reflector which is a typical optical element 5 of a light module 1 for a motor vehicle headlight is fixed on a heat sink 4.
  • a screw 9 is utilized as a fastening element 6, whereby according to fig. 2 the screw 9 is tightened so that the screw 9 as well as the reflector, the circuit board and the heat sink 4 are shown in a mounted state.
  • the screw 9 has been screwed into the threaded hole 12 which is located inside the heat sink 4 and therefore the coil spring is pressed together.
  • the shaft 10 of the screw 9 is arranged as well inside a through hole 14 of the circuit board, as a through hole 13 in the fastening area 8 of the optical element 5. Furthermore, according to the invention between the screw head 12 and the fastening area 8 of the optical element 5 a compressed coil spring as elastic spacer 7 is arranged in such a way, that a pressing force is transmitted from the screw head 11 via the coil spring into the optical element 5.
  • the coil spring acts as an elastic element 7 which, in the mounted state, is compressed. Since, as shown in Fig. 2 , the screw shaft 10 is in contact with the heat sink 4 the final and maximum pressing force is achieved.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
EP20159862.0A 2020-02-27 2020-02-27 Module de lumière d'une unité d'éclairage de véhicule à moteur et procédé d'assemblage d'un module de lumière d'un véhicule à moteur Pending EP3872395A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20159862.0A EP3872395A1 (fr) 2020-02-27 2020-02-27 Module de lumière d'une unité d'éclairage de véhicule à moteur et procédé d'assemblage d'un module de lumière d'un véhicule à moteur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20159862.0A EP3872395A1 (fr) 2020-02-27 2020-02-27 Module de lumière d'une unité d'éclairage de véhicule à moteur et procédé d'assemblage d'un module de lumière d'un véhicule à moteur

Publications (1)

Publication Number Publication Date
EP3872395A1 true EP3872395A1 (fr) 2021-09-01

Family

ID=69941135

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20159862.0A Pending EP3872395A1 (fr) 2020-02-27 2020-02-27 Module de lumière d'une unité d'éclairage de véhicule à moteur et procédé d'assemblage d'un module de lumière d'un véhicule à moteur

Country Status (1)

Country Link
EP (1) EP3872395A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140268834A1 (en) 2011-10-13 2014-09-18 Osram Gmbh Mounting device for lighting sources
WO2014190368A1 (fr) * 2013-05-29 2014-12-04 Zizala Lichtsysteme Gmbh Dispositif d'éclairage pour phare de véhicule
DE102014109114A1 (de) * 2014-06-30 2015-12-31 Hella Kgaa Hueck & Co. Anordnung eines Kühlkörpers in einem Scheinwerfer
EP3021044A1 (fr) * 2014-11-14 2016-05-18 Hella KGaA Hueck & Co. Module de lumiere et procede d'assemblage exempte de couple du module de lumiere
DE102016120431A1 (de) * 2016-10-26 2018-04-26 HELLA GmbH & Co. KGaA Lichtmodul für eine Beleuchtungseinrichtung eines Fahrzeuges
EP3428512A1 (fr) 2017-07-12 2019-01-16 Automotive Lighting Reutlingen GmbH Module d'éclairage d'un phare de véhicule automobile et phare de véhicule automobile doté d'un tel module d'éclairage
WO2019194276A1 (fr) * 2018-04-06 2019-10-10 株式会社小糸製作所 Appareil d'éclairage pour véhicule, unité de modulation de lumière spatiale et unité d'appareil d'éclairage
WO2020151813A1 (fr) * 2019-01-23 2020-07-30 HELLA GmbH & Co. KGaA Dispositif d'éclairage pour véhicule doté de moyens de positionnement

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140268834A1 (en) 2011-10-13 2014-09-18 Osram Gmbh Mounting device for lighting sources
WO2014190368A1 (fr) * 2013-05-29 2014-12-04 Zizala Lichtsysteme Gmbh Dispositif d'éclairage pour phare de véhicule
DE102014109114A1 (de) * 2014-06-30 2015-12-31 Hella Kgaa Hueck & Co. Anordnung eines Kühlkörpers in einem Scheinwerfer
EP3021044A1 (fr) * 2014-11-14 2016-05-18 Hella KGaA Hueck & Co. Module de lumiere et procede d'assemblage exempte de couple du module de lumiere
DE102016120431A1 (de) * 2016-10-26 2018-04-26 HELLA GmbH & Co. KGaA Lichtmodul für eine Beleuchtungseinrichtung eines Fahrzeuges
EP3428512A1 (fr) 2017-07-12 2019-01-16 Automotive Lighting Reutlingen GmbH Module d'éclairage d'un phare de véhicule automobile et phare de véhicule automobile doté d'un tel module d'éclairage
WO2019194276A1 (fr) * 2018-04-06 2019-10-10 株式会社小糸製作所 Appareil d'éclairage pour véhicule, unité de modulation de lumière spatiale et unité d'appareil d'éclairage
WO2020151813A1 (fr) * 2019-01-23 2020-07-30 HELLA GmbH & Co. KGaA Dispositif d'éclairage pour véhicule doté de moyens de positionnement

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