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EP4563878A1 - Lampe de rattrapage de led - Google Patents

Lampe de rattrapage de led Download PDF

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Publication number
EP4563878A1
EP4563878A1 EP23213513.7A EP23213513A EP4563878A1 EP 4563878 A1 EP4563878 A1 EP 4563878A1 EP 23213513 A EP23213513 A EP 23213513A EP 4563878 A1 EP4563878 A1 EP 4563878A1
Authority
EP
European Patent Office
Prior art keywords
heat sink
electrically conductive
light emitting
conductive heat
lighting device
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
EP23213513.7A
Other languages
German (de)
English (en)
Inventor
Frank Giese
Jürgen MERTENS
Martin Strzelczyk
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.)
Lumileds LLC
Original Assignee
Lumileds LLC
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 Lumileds LLC filed Critical Lumileds LLC
Priority to EP23213513.7A priority Critical patent/EP4563878A1/fr
Publication of EP4563878A1 publication Critical patent/EP4563878A1/fr
Pending legal-status Critical Current

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Classifications

    • 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
    • F21K9/23—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
    • F21K9/232—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
    • 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]
    • F21S41/147—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device
    • F21S41/148—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device the main emission direction of the LED being perpendicular to the optical axis
    • 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
    • F21S45/47—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
    • 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
    • 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
    • F21Y2107/00—Light sources with three-dimensionally disposed light-generating elements
    • F21Y2107/90—Light sources with three-dimensionally disposed light-generating elements on two opposite sides of supports or substrates
    • 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 disclosure relates to a lighting device such as e.g. a light source for an automotive headlight.
  • Lighting devices such as halogen lamps have been used as light sources for automotive headlights for many years.
  • LED light-emitting diode
  • Such lighting devices replacing halogen lamps may be referred to as LED retrofits.
  • LED retrofits often allow for efficient halogen lamp replacements, at least in certain situations, heat usually produced by operating LEDs has to be guided away from operating LEDs.
  • heatsinks in combination with rather expensive metal core printed circuit boards may be used, i.e. components of the corresponding LED retrofits that usually are in thermal contact with corresponding LEDs and that are formed from a material with sufficiently high thermal conductivity, to guide heat away from the LEDs when operating.
  • a lighting device comprising: a support structure comprising at least two at least partly electrically conductive heat sink parts and at least one electrically isolating layer separating the at least two electrically conductive heat sink parts, at least one light emitting element arranged on one of the at least two electrically conductive heat sink parts, wherein the at least one light emitting element is electrically connected to electrical contact portions of the at least two electrically conductive heat sink parts.
  • an automotive headlight comprising a lighting device according to the first aspect.
  • Exemplary embodiments of the first and second aspect of the invention may have one or more of the properties described below.
  • the lighting device is a light source for an automotive headlight, e.g. a retrofit lamp for automotive headlight applications.
  • the at least one light emitting element is or comprises at least one light-emitting diode, LED.
  • the lighting device comprises at least two light emitting elements.
  • the lighting device is provided with suitable means to be mounted to a vehicle, e.g. a car, a motorcycle or a truck.
  • the lighting device comprises in particular adapter means for mounting the lighting device.
  • the support structure of the lighting device comprises at least two at least partly electrically conductive heat sink parts. It is in particular preferred that the support structure comprises exactly two heat sink parts.
  • the heat sink parts are configured to guide the heat generated by the at least one light emitting element away from the at least one light emitting element and to additionally electrically connect the at least one light emitting element.
  • the support structure, in particular the heat sink parts may be formed, at least in part, from a heat conductive material, in particular from a metal. Use of such material may be advantageous in that heat is guided away from the at least one light emitting element in a particularly efficient manner and electrical connection of the at least one light emitting element is similarly enabled.
  • the support structure comprising the at least two at least partly electrically conductive heat sink parts may be formed by extrusion molding.
  • Extrusion molding is a process that allows forming the support structure in a non-complex way nevertheless allowing for sufficient production quality.
  • further components such as cooling elements provided on the support structure may be formed integrally in combination with the heat sink parts in a single production step.
  • the support structure does not additionally comprise a printed circuit board or PCB, in particular no metal PCB.
  • the at least one electrically isolating layer is configured to electrically separate the conductive parts of one of the heat sink parts from the conductive parts of one other of the heat sink parts. This enables a support structure which may inherently provide the necessary electrical connections to connect at least one light emitting element and additionally provide beneficial cooling abilities. In particular, via the at least one electrically isolation layer shorts may be prevented reliably.
  • the at least one light emitting element is a light emitting diode (LED), for example a light emitting diode configured for emitting light in a color temperature range of 2500-7500K, in particular of 4000-7000K, in particular of 5000-6500K.
  • LED light emitting diode
  • Such light emitting diodes are suitable light sources in particular for automotive applications as they enable emitting light of suitable color at advantageous brightness.
  • the at least one light emitting element is configured to emit light at a luminous flux of 600 -1200 lumen (lm), in particular of 620 - 1100 lm.
  • the at least one light emitting element is a top contact light emitting element. This allows for electrically contacting the at least one light emitting element from a top surface which in particular enables a beneficial electrical connection of the at least one light emitting element as well as beneficial heat dissipation properties.
  • the at least one light emitting element is arranged at least on one of the at least two heat sink parts.
  • the heat sink part comprises a mounting section or mounting surface configured to support and/or hold the at least one light emitting element.
  • the heat sink part may in an exemplary embodiment, comprise or correspond to, at least in part, an essentially flat member, e.g. with an elongated, e.g. essentially rectangular, shape, forming a mounting surface for supporting the at least one light emitting element.
  • the lighting device may comprise more than one light emitting element and more than one heat sink part, whereby one or more light emitting elements and/or one or more, in particular two heat sink parts may be provided on opposing sides of the support structure, the opposing sides facing opposing directions.
  • the support structure comprises two sides with at least one light emitting element being arranged on either one of the two sides of the support structure, wherein the two sides of the support structure are provided by at least two heat sink parts respectively.
  • the support structure may thus comprise two mounting surfaces on opposing sides facing opposing directions for mounting, wherein a light emitting element is provided on both sides of the two mounting surfaces.
  • the support structure in particular the at least two electrically conductive heat sink parts, may provide an electrical connection to the at least one light emitting element and/or to further electrical components provided on the support structure as needed.
  • the at least two heat sink parts at least comprise one or more electrical contact portions or regions for electrically contacting the at least one light emitting element.
  • the isolation layer is not arranged on the electrical contact portions of the at least two heat sink parts.
  • the at least one light emitting element is arranged, preferably directly arranged, on one of the at least two electrically conductive heat sink parts by means of an adhesive, in particular by means of an electrically non-conductive adhesive.
  • an adhesive preferably via glue
  • a connection method is provided which comprises good heat dissipation properties even at high temperatures.
  • the at least one light emitting element preferably is in direct thermal contact with the heat sink part and/or the adhesive and heat is transferred from the at least one light emitting element to the heat sink part of the support structure in an efficient and reliable manner.
  • the used adhesives may provide sufficient reliabilities in temperature ranges above 125 °C.
  • a lighting device which can be run at higher temperature ranges with a sufficiently high reliability.
  • the at least one light emitting element is directly connected to the respective conductive heat sink part via the adhesive.
  • no solder or the like is arranged between the at least one light emitting element and the heat sink part on which the light emitting element is arranged.
  • the at least one light emitting element is electrically connected to the electrical contact portions of the at least two electrically conductive heat sink parts via bonding means.
  • electrical contact regions of the at least one light emitting element are respectively electrically connected to the corresponding electrical contact portions of the at least two electrically conductive heat sink parts. This allows for connecting an electrical contact region comprising a negative terminal of the at least one light emitting element with one of the at least two electrically conductive heat sink parts and an electrical contact region comprising a positive terminal of the at least on light emitting element with the other of the at least two electrically conductive heat sink parts in a favorable design manner.
  • the at least one light emitting element comprises the electrical contact portions with the negative terminal and the positive terminal on its top side, e.g. the side facing away from the side which is arranged on one of the at least two electrically conductive heat sink parts.
  • the light emitting element therefore is a top contact light emitting element.
  • the bonding means preferably are formed as wire bonding means, ribbon bonding means and/or wedge bonding means.
  • a electrical connection of the at least one light emitting element may be ensured in a constructively advantageous manner.
  • at least two boding means are supplied for each light emitting element in order to connect the negative and the positive terminal of the light emitting element to the respective heat sink parts.
  • each of two electrical contact regions of the at least one light emitting element are electrically connected to a different one of the at least two electrically conductive heat sink parts via the bonding means.
  • the supporting structure in particular the heat sink parts, may be used for electrically connecting the at least one light emitting element. This enables a connection method of the at least one light emitting element which also inherently comprises beneficial cooling abilities.
  • At least one of the electrically conductive heat sink parts comprises a cutout area for connecting the at least one light emitting element being arranged on the at least one electrically conductive heat sink part to another one of the electrically conductive heat sink parts via the bonding means.
  • one bonding means is used to connect the positive terminal of the at least one light emitting element to the first heat sink part and another bonding means is used to connect the negative terminal of the at least one light emitting element to the other heat sink part, wherein such a connection is enabled by the cutoff area of the first heat sink part.
  • the electrical contact portions of the at least two electrically conductive heat sink parts are substantially not covered by the at least one electrically isolating layer.
  • the isolating layer may for example be removed by a laser ablation process.
  • a sufficient electrical connection between the at least one light emitting element and the at least two electrically conductive heat sink parts is enabled.
  • the at least one electrically isolating layer is configured as a separate dielectric isolating layer.
  • the isolating layer may be configured as an isolating pad and/or may be provided by coating at least one of the at least two heat sink parts.
  • the at least one electrically isolating layer is arranged in between the at least two heat sink parts, in particular interposed between the at least two heat sink parts and thus electrically isolates the at least two heat sink parts from each other.
  • the dielectric isolating layer may cover substantially at least one side of the heat sink part, in particular the side of the heat sink part which faces towards the other heat sink part, except for the electrical contact portions, for reliably preventing shorts.
  • the at least one electrically isolating layer is configured as at least one integral layer of at least one of the at least two electrically conductive heat sink parts, wherein the at least one integral layer preferably is configured as an anodized layer.
  • an electrical isolation is enabled without adding a separate part or coating to the lighting device.
  • the overall dimensions of the support structure may be reduced.
  • the anodized layer improves corrosion resistance and wear resistance of the heat sink part.
  • the integral layer may be formed substantially on at least one side of the heat sink part, in particular on the side of the heat sink part which faces towards the other heat sink part, except for the electrical contact portions, for reliably preventing shorts.
  • the at least two partly electrically conductive heat sink parts comprise metal, aluminum and/or an aluminum alloy, preferably consist of aluminum and/or an aluminum alloy.
  • the at least two partly electrically conductive heat sink parts are made as extruded metal, in particular as extruded aluminum, profiles.
  • the heat generated by the at least one light emitting element may be thermally dissipated in a beneficial way.
  • the at least one light emitting element may be electrically connected through the at least two heat sink parts so that not printed circuit board has to be used in the vicinity of the at least one light emitting element.
  • the at least two partly electrically conductive heat sink parts each comprise at least one cooling element, preferably a plurality of cooling fins, wherein the at least one cooling element preferably is formed integrally with the respective at least partly electrically conductive heat sink part.
  • the at least one cooling element dissipates the heat generated by the at least one light emitting element in a beneficial way.
  • the at least one cooling element thus enhances a cooling effect and an effect of the support structure functioning as heat sink of the lighting device. Heat generated by the at least one light emitting element in operation may thus be transferred to the support structure and thus to the at least one cooling element.
  • the at least one cooling element may be formed, at least in part, from extruded rods, in particular comprising suitable alloys of aluminum.
  • the at least one cooling element is or comprises a cooling fin comprising a cooling surface, e.g. of essentially rectangular or triangular shape, the cooling surface being arranged essentially orthogonal to the mounting section of the at least one light emitting element.
  • the at least one first cooling element is formed by extrusion molding in a single production step with the at least one heat sink element.
  • the plurality of cooling fins are arranged essentially mutually parallel. Thereby, being essentially mutually parallel is to be understood such that an angle formed by the plurality of cooling elements to each other is smaller than 10°, in particular smaller than 5°, in particular smaller than 2°.
  • the at least one cooling element comprises an edge with at least one section being inclined with respect to the heat sink part.
  • the at least one first cooling element is inclined continuously along this section, for example in a direction away from the at least one light emitting element.
  • the edge of the at least one first cooling element may be inclined away from the at least one light emitting element to avoid an obstruction of light emitted from the at least one light emitting element.
  • an inclination with respect to the support structure may be smaller than 50°, in particular smaller than 30°, in particular smaller than 20°.
  • the lighting device further comprises at least another cooling element being arranged opposite to the at least one first cooling element with respect to the at least one light emitting element.
  • the lighting device further comprises at least another cooling element being spatially separated from the at least one cooling element by the at least one light emitting element.
  • the at least two partly electrically conductive heat sink parts are substantially identical.
  • the at least two partly electrically conductive heat sink parts are tilted with regard to each other, in particular one heat sink part is tilted along its longitudinal axis by substantially 180°.
  • the two rear sides of the two heat sink parts are then preferably arranged on each other, wherein an isolating layer is arranged between the two heat sink parts.
  • the at least two partly electrically conductive heat sink parts are attached to each other via electrically non-conductive fixation means, preferably via adhesive and/or electrically non-conductive screws.
  • electrically non-conductive fixation means preferably via adhesive and/or electrically non-conductive screws.
  • the lighting device further comprises: at least one printed circuit board, wherein the at least two electrically conductive heat sink parts are electrically connected to the at least one printed circuit board.
  • the at least one light emitting element is electrically connected to the at least one printed circuit board (PCB) via the heat sink parts.
  • the at least one light emitting element is electrically controlled via the PCB.
  • the at least one printed circuit board preferably comprises at least one driver element, for example a signal processing unit, for the at least one light emitting element.
  • the at least one printed circuit board is not in direct contact with the at least one light emitting element and with the heat sink parts.
  • connection means may be connected to the heat sink parts and/or the PCB via ribbon bonding, at least one clamping system, soldering and/or welding.
  • the lighting device further comprises: a housing, wherein the support structure is at least in part arranged within at least part of the housing.
  • the housing may be a component of the lighting device that may provide in particular protection for one or more further components of the lighting device.
  • the support structure being arranged at least in part within at least part of the housing, in an exemplary embodiment, at least in mounted condition of the lighting device, the housing encloses at least part of the support structure.
  • at least in mounted condition of the lighting device the housing encloses at least part of the at least one cooling element.
  • the housing and the support structure are separate components of the lighting device. In this way, advantageous flexibility is provided, in particular for attributing a main heat guiding function to the support structure, enabling a construction of the housing independently of this function, thereby enabling in particular fabrication of the housing from a different material.
  • the housing may be formed of a material corresponding to the material of the support structure, e.g. from a metal
  • embodiments of the present disclosure attribute a main heat guiding function to the support structure, which may thus correspond to a main heat sink of the lighting device. In this way, it becomes possible to form at least part of the housing from a different material, such as a plastic material.
  • At least part of the housing is tapered in at least one dimension towards the at least one light emitting element.
  • at least a section of the housing comprises a cross-section decreasing in size towards the at least one light emitting element.
  • the housing may in an exemplary embodiment comprise a tubular section having an essentially circular, an essentially elliptical, an essentially rectangular or an irregular cross-section. The housing may thus reduce the space in between the support structure and the housing and may thus act in a nozzle-like way not only guiding but also intensifying an air flow onto the support structure, in particular within an area of the support structure supporting the at least one light emitting element thus facilitating an improved cooling effect in particular in this area.
  • At least part of the housing at least partly surrounds at least part of the at least one cooling element.
  • at least part of the housing at least partly encloses or encapsulates at least part of the at least one cooling element.
  • the housing confines at least part of an air flow generated by the at least one air source onto the at least one cooling element increasing the cooling effect of the air flow.
  • the housing is at least in part formed from a material transparent for at least part of light emitted from the at least one light emitting element, e.g. a glass material or a transparent plastic material.
  • the housing may for example be formed at least in part as an at least partly transparent tube.
  • the lighting device further comprises: an air source configured to generate an air flow.
  • the at least one air source may e.g. be provided adjacent to the at least one cooling element.
  • heat may be transferred from the support structure to the cooling element, which may then transfer at least part of the heat on to the air flow.
  • the air flow may thus remove at least part of the heat generated by the at least one light emitting element.
  • the at least one air source configured to generate an air flow is or comprises a fan, for example an axial fan with an air flow being generated and output in a direction essentially vertical to a plane of rotation of the fan.
  • a fan may be a radial fan with an air flow being generated and output in a direction essentially parallel to the plane of rotation of the fan.
  • the at least one air source may be arranged on the support structure and/or the at least one air source may be electrically connected to the electrical power supply via the support structure and/or via the at least two heat sink parts.
  • the at least one air source may be arranged on a component of the lighting device other than the support structure, e.g. in an exemplary embodiment, the at least one air source is supported by the adapter means.
  • the housing contains structures to guide the air flow to and from the fan.
  • the at least one air source is arranged such that an air flow generated by the at least one air source has a general direction towards the at least one cooling element and/or towards the at least one light emitting element. While it is thus possible that the air flow is generated in a direction towards the at least one light emitting element, in an exemplary embodiment, the at least one air source is arranged on the support structure adjacent to the at least one cooling element, wherein a main direction of an air flow generated by the at least one air source is essentially perpendicular to a direction from the at least one cooling element (e.g. from an arrangement of one or more cooling elements) to the at least one light emitting element (e.g. to an arrangement of one or more light emitting elements).
  • the lighting device further comprises: at least two light emitting elements, wherein at least one first of the at least two light emitting elements is arranged on at least one first mounting section, preferably first mounting surface, of at least one first of the at least two electrically conductive heat sink parts, and wherein at least one second of the at least two light emitting elements is arranged on at least one second mounting section, preferably second mounting surface, of at least one second of the at least two electrically conductive heat sink parts.
  • the first and the second mounting section are configured to support and/or hold the at least one light emitting element.
  • the support structure, in particular the respective heat sink parts may in an exemplary embodiment, comprise or correspond to, at least in part, an essentially flat member, e.g.
  • the support structure may preferably comprise two mounting surfaces on opposing sides facing opposing directions for mounting, wherein at least one light emitting element and/or at least one cooling element is provided on a respective one of the two mounting surfaces.
  • the at least two electrically conductive heat sink parts are arranged such that the respective mounting sections are substantially opposite to each other.
  • at least two light emitting elements may be arranged on the lighting device and thus similar radiation characteristics to those of a halogen lamp may be achieved.
  • Fig. 1 shows an example of a lighting device 100 according to an exemplary embodiment of the invention.
  • the lighting device 100 is an LED retrofit which contains an adapter means 160 to connect the LED retrofit to an automotive headlight unit.
  • the adapter means 160 comprises an adapter ring 162 and two power pins 164a and 164b for electrical connection (only pin 164a being visible in Fig. 1 ).
  • the support structure 110 supports a top-contact LED 120, which is an example of a light emitting element.
  • a further LED 120 is provided on the opposing side of the support structure 110 which is not visible in the figure.
  • the LEDs 120 are directly attached to the heat sink parts 112a and 112b by means of an adhesive, in particular by means of an electrically non-conducive adhesive.
  • the two heat sink parts 112a and 112b are substantially identical and attached to each other via electrically non-conductive fixation means.
  • the LED 120 is electrically connected through ribbon-bonding connections 122a, 122b to electrical contact portions of the electrically conductive heat sink parts 112a and 112b of the support structure 110 for electrically connecting LEDs 120.
  • heat sink parts 112a and 112b comprises cutout areas 113a and 113b in which the ribbon-bonding connections 122b are arranged.
  • An electrically isolating layer 114 is arranged between the two heat sink parts 112a and 112b.
  • the electrically isolating layer may be configured as an integral layer of one of the two heat sink parts 112a and 112b or as a separate dielectric layer.
  • the isolating layer 114 does not cover electrical contact portions of the heat sink parts 112a and 112b, e.g. the portions were the ribbon-bonding connections 122a and 122b contacts the heat sink parts 112a and 112b.
  • the two heat sink parts 112a and 112b consist of a metal, in particular of aluminum or an aluminum alloy.
  • a cooling element 150b with eight cooling fins 154 (cooling extensions) is arranged on each of the heat sink parts 112a, 112b of the support structure 110, the cooling fins being arranged such that a main plane of the cooling fins (cooling extensions) is arranged essentially parallel to a main direction of extension of the support structure 110.
  • An air source and further cooling elements 150a are shown in Fig. 2 , whereby in the shown example the air source is a fan 130 as described further herein.
  • a housing 140 is provided surrounding part of support structure 110 and the cooling elements 150a, the housing 140 being tapered towards the LED 120.
  • the housing 140 comprises ventilation slits 146 (an arrangement of slits) to ensure sufficient air supply for the underlying radial fan 130.
  • Both cooling elements 150a and 150b are preferably formed integrally with the heat sink parts 112a and 112b.
  • Fig. 2 shows an exploded view of the lighting device 100 of Fig. 1 .
  • an air flow that can be generated by fans 130 exits a housing of fan 130 at its side directly adjacent to cooling element 150a to pass through cooling element 150a over LED 120 and further through cooling element 150b such that a cooling effect of the air flow on the support structure 110, which acts not only as a support for the LED 120 but also as a heat sink for the lighting device 100, is further enhanced by cooling elements 150a and 150b.
  • respective fans (air sources) 130 are provided on either side of the support structure 110 on each of the heat sink parts 112a and 112b.
  • the cooling fins 150a have respective inclined edges (inclined section 156) being inclined away from the LED (a respective height decreases towards the LED).
  • housing 140 has two mutually opposing parts respectively surrounding or enclosing at least part of the support structure 110 and the cooling fins 150a, the housing 140 being arranged to guide at least part of the air flow generated by the at least one air source (fan 130) in between the support structure 110 and the housing 140.
  • an inner surface of housing 140 follows the inclination of inclined section 156.
  • the support structure 110 in particular the two heat sink parts 112a and 112b, are formed from a heat conductive material such as a metal, in particular aluminum or copper to facilitate a heat flow away from the LED 120 and to enable an electrical connection of the LED 120.
  • a heat conductive material such as a metal, in particular aluminum or copper
  • the provision of cooling elements 150a, 150b in the shown example enhances a cooling effect of an air flow generated by the at least one air source (fan 130).
  • the advantageous cooling effect provided by support structure 110 with cooling elements 150a, 150b allows for housing 140 to be fabricated from a material that does not need to be heat conductive, e.g. a plastic material.
  • Figs. 3 shows a cross-sectional view of a further examples of a lighting device 100 according to exemplary embodiments of the invention. As mentioned, like reference numerals indicate the same components.
  • Figs. 3 may correspond to a cross-sectional view of the examples shown in Figs. 1 and 2 .
  • the cooling elements 150a, 150b comprise cooling fins (cooling extensions) 154 which are connected to the support structure 110. As in the example of Fig. 1 , eight cooling fins 154 may be provided on either side of the LED 120, only one respective one of which is visible in the figure.
  • the fan 130 (air source) is mounted next to the cooling elements 150a with an airflow 170 guided by the cooling extensions 154 towards the LED 120. After passing the cooling elements 150a and the LED 120 the air flow further passes cooling elements 150b to enable a further cooling of the support structure.
  • the cooling fins 154 are formed integrally with the heat sink parts 112a and 112b such that a main plane of the cooling fins (cooling extensions) is arranged essentially perpendicular to a main direction of extension of the support structure 110 and the heat sink parts 112a and 112b.
  • the lighting device 100 further comprises a printed circuit board 190, wherein the printed circuit board 190 is connected via ribbon bonds 200 to both of the heat sink parts 112a and 112b.
  • the printed circuit board 190 in particular comprises the driver elements needed for the functioning of the LEDs 120.
  • Lighting device 100 Support structure 110 Heat sink parts 112a, 112b Cutout areas 113a, 113b Isolating layer 114 Light emitting element 120 LED top connection 122a, 122b Fan 130 Housing 140 Tapered section 144 Ventilation slit 146 Cooling element 150a, 150b Cooling extension 154 Inclined section 156 Adapter means 160 Adapter ring 162 Power pins 164a, 164b Air flow 170 Driver PCB 190 Ribbon Bonds 200

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)
EP23213513.7A 2023-11-30 2023-11-30 Lampe de rattrapage de led Pending EP4563878A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP23213513.7A EP4563878A1 (fr) 2023-11-30 2023-11-30 Lampe de rattrapage de led

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP23213513.7A EP4563878A1 (fr) 2023-11-30 2023-11-30 Lampe de rattrapage de led

Publications (1)

Publication Number Publication Date
EP4563878A1 true EP4563878A1 (fr) 2025-06-04

Family

ID=89029899

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23213513.7A Pending EP4563878A1 (fr) 2023-11-30 2023-11-30 Lampe de rattrapage de led

Country Status (1)

Country Link
EP (1) EP4563878A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011005823A1 (de) * 2011-03-21 2012-09-27 Osram Ag Beleuchtungseinrichtung und Fahrzeugscheinwerfer mit Beleuchtungseinrichtung
US20140362573A1 (en) * 2011-09-20 2014-12-11 Citizen Electronics Co., Ltd Led module and led lamp employing same
EP3073180A1 (fr) * 2015-03-23 2016-09-28 Valeo Vision Support de led avec surface de réception et connexion électrique par pontage
CN207602619U (zh) * 2017-11-23 2018-07-10 麦科勒（滁州）新材料科技有限公司 一种led车灯导热封装结构、led车灯
US20220260222A1 (en) * 2021-02-16 2022-08-18 Lumileds Llc Lighting device, method of manufacturing a lighting device and automotive headlamp

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011005823A1 (de) * 2011-03-21 2012-09-27 Osram Ag Beleuchtungseinrichtung und Fahrzeugscheinwerfer mit Beleuchtungseinrichtung
US20140362573A1 (en) * 2011-09-20 2014-12-11 Citizen Electronics Co., Ltd Led module and led lamp employing same
EP3073180A1 (fr) * 2015-03-23 2016-09-28 Valeo Vision Support de led avec surface de réception et connexion électrique par pontage
CN207602619U (zh) * 2017-11-23 2018-07-10 麦科勒（滁州）新材料科技有限公司 一种led车灯导热封装结构、led车灯
US20220260222A1 (en) * 2021-02-16 2022-08-18 Lumileds Llc Lighting device, method of manufacturing a lighting device and automotive headlamp

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