• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a lighting device (1) for a vehicle headlight, the lighting device (1) comprising: - at least one LED light source (2), - at least one reflector (3) which is associated with the at least one LED light source (2), - At least one LED light source carrier (4) on which the at least one LED light source (2) is fixed, wherein - on the reflector (3) positioning (3a, 3b, 3c) or in addition to the lighting device (1) provided fixing elements for positioning the at least one LED light source carrier (4) are provided on the reflector, and wherein the positioning means (3a, 3b, 3c) and / or the fixing elements are adapted to the LED light source carrier (4 ) to the reflector (3), wherein the reflector (3) consists at least partially of metallic magnesium containing material.
    公开号:AT518543A4
    申请号:T50554/2016
    申请日:2016-06-17
    公开日:2017-11-15
    发明作者:Josef Gürtl Ing
    申请人:Zkw Group Gmbh；
    IPC主号:
    专利说明:

    LED system reflector with heat coupling
    The invention relates to a lighting device for a vehicle headlight, wherein the lighting device comprises: at least one LED light source, at least one reflector associated with the at least one LED light source, at least one LED light source carrier on which the at least one LED light source is mounted is, wherein on the reflector positioning means or additionally provided on the lighting device fixing elements for positioning the at least one LED light source carrier s are provided on the reflector, and wherein the positioning means and / or the fixing elements are adapted to the LED light source carrier to attach to the reflector.
    The number of positioning means and / or fixing elements is at least two in total, so that the light source carrier is fixed to the position of the light source carrier at at least two locations with respect to the reflector.
    In addition, the invention relates to a motor vehicle headlight with a lighting device according to the invention.
    In vehicle headlamp design, LED light sources consisting of one or more light-emitting diodes are increasingly used to produce one (or more) main light distribution (s), such as high beam distribution, dimmed light distributions, e.g. Dipped beam, etc. used. Usually, the light from one or more LED light sources via one or more reflectors in an area in front of the motor vehicle, in which the vehicle headlamp is installed, radiated and these illuminated / illuminate the area in front of the vehicle.
    In order to be able to realize a law-compliant light distribution, it is important that the reflector and the associated light source (s) are correctly positioned relative to each other. Especially at the
    The use of LED light sources is even more important for this topic since relatively small deviations from the desired position can already lead to unwanted and / or unacceptable effects in the photograph. Usually, the LED light source (s) are arranged on a heat sink. The LED light source (s) sits or sit on a support, which is usually in the form of an LED board, and the support in turn is arranged on the heat sink, for example glued to it. The associated reflector is positioned accordingly and then fixed to the heat sink or with respect to the heat sink, usually screwed with this or with another fixed component of the lighting device.
    However, it has often been found that it can come through the fastening process, in particular by tightening the reflector and the forces occurring in a distortion of the reflector or there is generally in the fastening process to an unintentional adjustment of the reflector from the optimum position. This has a detrimental effect on the photograph obtained, partly with the result that the photograph no longer meets the legal requirements.
    An object of the invention is therefore to provide a lighting device that is inexpensive and easy to manufacture and at the same time dimensionally stable and robust.
    This object is achieved with a lighting device of the type mentioned, in which the reflector according to the invention consists at least partially of metallic magnesium-containing material. This makes it possible to design the reflector lightweight yet dimensionally stable. In particular, such a reflector compared to conventional reflectors previously made mostly of plastic increased mechanical strength and increased thermal conductivity, which is why the deformation of the reflector due to connections to the LED light source carrier and / or other elements of a vehicle headlamp is unproblematic and In addition, the increased thermal conductivity of the reflector can be used to absorb heat dissipated by the lighting device and to deliver it to the surroundings of the reflector and thus to cool the LEDs of the lighting device thereby facing the reflector so that it can reflect light emitted by the light source.
    In order to improve the heat transfer from the LED light source carrier to the reflector, it may be provided that the LED light source carrier contacts the reflector in at least one contact region, wherein in the contact region at least one means for improving the heat transfer from the LED light sources Carrier provided to the reflector.
    In particular, it can be provided that the means for improving the heat transfer from the LED light source carrier toward the reflector tracks copper, copper inserts, heat expansion surfaces and / or thermal grease comprises. A heat spreading surface is understood to mean a heat conducting surface which is provided for the purpose of heat conduction along the heat spreading surface.
    It can be particularly favorable when the at least one means extends at least partially up to the at least one LED light source.
    In particular, it can be provided that the reflector consists of at least 80 percent by weight of metallic magnesium. Other components of the reflector may e.g. also aluminum and / or e.g. Be zinc that is too magnesium alloy to put. For example, the material AZ91 could be provided.
    In addition, it can be provided that the reflector has a reflective coating. For this purpose, the reflector has a lacquer coating for smoothing the granular surface of the magnesium, onto which, for example, a reflective aluminum layer is subsequently carried.
    It can be particularly favorable if the reflector is produced by magnesium injection molding.
    The term "magnesium injection molding" is understood to mean a process in which magnesium is brought into a doughy state and is introduced into an injection mold, similar to the plastic injection molding process, for example, under the registered trade marks "Thixomolding" or "Mold-Thix Thus, for example, the homepage of the company "LTC GmbH" to the method "Thixomolding" is the following to say: Thixomolding is an injection molding process in which the magnesium is injected in the "doughy" state in the injection mold. It forms a laminar flow front, similar to the plastic injection molding. The doughy material state is produced by simultaneous shearing and heating of the magnesium before it is introduced into the casting mold. This is done in a magnesium injection molding machine under inert gas. Using a screw and external heating, magnesium can be brought to a temperature of 560 ° to 600 ° C and then pressed into the mold cavity of a tool. The injection process, including repressurization, can take, for example, 0.03 seconds, and the cycle time, depending on the part size, can be 20-45 seconds. The laminar flow front during thixomolding creates parts with a more uniform material structure and lower porosity or voids compared to diecasting.
    Thus, the following advantages can be combined: 1. Good impression accuracy including reference pins 2. Good surface quality (coating for reflector surface is required) 3. High rigidity 4. Thermal conductivity 5. Integration of cooling fins 6. High integration density 7. Low weight
    All in all, a simplified, stable and cost-effective overall solution can be achieved.
    In addition, it can be provided that the LED light source carrier and the reflector have openings for receiving positioning means and / or fixing elements. It can be particularly favorable if the positioning means and / or fixing elements are designed as screws for engagement in the openings.
    In particular, it can be provided that the reflector has cooling fins.
    It can also be provided that the LED light source carrier is connected to a heat sink.
    Furthermore, it can be provided that the LED light source carrier is designed as a printed circuit board having copper inserts.
    In addition, it can be provided that additional positioning means are provided on the reflector for positioning a heat sink on the reflector.
    In other words, the disadvantage of the prior art can be formulated as follows: In the LED modules currently being implemented, the LED is soldered to a printed circuit board (IMS) with relatively large tolerances. In the next process step, the LED is measured and glued to a heat sink. Subsequently, a reflector is positioned and fixed on the heat sink or via a support frame attached therebetween. This creates a series of toleranced parts that are critical to the overall result, which can also be influenced by the assembly.
    According to one aspect of the invention, by using precisely positioned LEDs, the reflector can be positioned and aligned directly with one another via reference pins on the reflector and reference holes on the print. The attachment to each other can then be realized by gluing, screwing, riveting, clamping, etc.
    Due to the limited efficiency of the LEDs, active or passive cooling of the LEDs may be required.
    For the services used for headlamps, a generous dimensioning and material selection of the print is often not sufficient. Therefore, large-volume heat sinks have been used for it.
    By using a thermally conductive material for the reflector, namely a magnesium-containing material, and a thermal connection to the print, the reflector can be used partially or wholly as a heat sink.
    If necessary, the printrückseite can be supplemented with a heat sink.
    The heat sink can be used, for example: • A199.5 with double heat conduction like AL die casting • Bronze alloy CuSnl5 with 3-fold heat conduction as AL die casting, can also be soldered in tinned version • Or similar alloys • Available as low-cost extruded profile, stamped and bent part made of sheet metal or extruded part
    Depending on the heat-technical requirements, the connection can be made directly, by means of heat-conducting foil, heat-conducting film, thermal paste, thermal adhesive or the like.
    Due to the required heat conduction, the currently used substrate is mainly ceramic or AL material. On the one hand, this is expensive; on the other hand, the line unbundling and component assembly are only possible on one side and in one layer. This sometimes leads to space problems.
    By using FR4 material with the insert of solid copper tracks, copper inserts or heat expansion surfaces for heat conduction and heat coupling to the heat-conducting reflector, the cooling of the LED's can be improved. This also Durchkontaktierungen and multilayer prints are possible. This is a more cost-effective solution and can also be used in a space-saving way with double-sided equipment (eg plug fitted to the bottom or rear).
    The invention is explained in more detail below with reference to an exemplary and non-limiting embodiment, which is illustrated in the figures. It shows
    1 is an exploded view of a lighting device according to the invention,
    In the following figures, unless otherwise stated, like reference numerals designate like features.
    FIG. 1 shows an embodiment of a lighting device 1 for a vehicle headlight. In the embodiment shown, the lighting device 1 comprises an LED light source 2 which, in the embodiment shown, consists of a plurality of LEDs (light-emitting diodes). Furthermore, the lighting device 1 comprises a light-shaping reflector 3, which is associated with the LED light source 2. The LED light source 2 couples light via a coupling point 3d in the reflector 3 a.
    In the specific example, the reflector 3 is a reflector 3, the coupling point 3d is formed as an opening in the reflector 3, via which the LED light source 2 can emit their light on the reflective surface of the reflector 3.
    In general, that is to say irrespective of the type of reflector, one or more LED light sources can be provided, wherein each LED light source can have one or more LEDs. Preferably, some or all of the LED light sources are independently controllable, i. can be switched on and off and possibly also dimmed. Likewise, it may also be advantageous if individual or each LED of an LED light source can be controlled independently.
    Furthermore, the lighting device comprises an LED light source carrier 4, on which the LED light source 2 is mounted. The carrier 4 is usually an LED board.
    Finally, the lighting device 1 summarizes still a heat sink 5 for dissipating the heat generated by the LED light source 2 and a fixing means 6, whose function will be described in more detail below. The heat sink 5 could also be formed integrally with the reflector 3. Alternatively, the reflector 3 could also have individual cooling fins.
    In an assembly of the lighting device 1, the LED board 4 is initially positioned on the reflector 3 and fastened by means of fixing elements, such as bolts or screws, which engage in corresponding openings 7 on the reflector.
    In the embodiment shown, the reflector 3 has two preferably parallel webs or ribs 60, on which the carrier 4 rests.
    For this purpose, initially 3 positioning means 3a, 3b, 3c for positioning the LED light source carrier s 4 are provided on the reflector.
    The positioning means on the reflector 3 in this case comprise two domes 3a, which are integrally formed with the reflector 3 and projecting from this extending parallel to each other. In this case, the domes 3a are-generally, that is to say independent of the specific embodiment of the reflector-preferably arranged in the region of the "coupling-in point", in the specific example in the region of the opening 3d of the reflector 3. It is optimal if the domes 3a are present are arranged symmetrically about the coupling point.
    Furthermore, the positioning means in the present embodiment comprise two retaining springs 3b, which in turn are preferably formed integrally with the reflector 3.
    In other words, FIG. 1 shows a lighting device 1 for a vehicle headlight, the lighting device 1 having at least one LED light source 2, at least one reflector 3 associated with the at least one LED light source 2 and at least one LED light source carrier 4 on which which is attached at least one LED light source 2 comprises. On the reflector 3 positioning means 3a, 3h, 3c or additionally provided on the lighting device 1 fixing elements for positioning the at least one LED light source carrier 4 are provided on the reflector, wherein the positioning means 3a, 3b, 3c and / or the fixing arranged to are to attach the LED light source carrier 4 to the reflector 3, wherein the reflector 3 is at least partially made of metallic magnesium-containing material.
    In view of this teaching, one skilled in the art will be able to arrive at other, not shown embodiments of the invention without inventive step. The invention is therefore not limited to the embodiment shown. Also, individual aspects of the invention or the embodiment can be taken up and combined with each other. Essential are the ideas underlying the invention, which can be performed by a person skilled in the knowledge of this description in a variety of ways and still remain maintained as such.
    权利要求:
    Claims (15)
    [1]
    claims
    1. Lighting device (1) for a vehicle headlight, wherein the lighting device (1) comprises: at least one LED light source (2), at least one reflector (3), which is associated with the at least one LED light source (2), at least one LED Light source carrier (4) on which the at least one LED light source (2) is fixed, wherein on the reflector (3) positioning (3a, 3b, 3c) or additionally provided on the lighting device (1) fixing elements for positioning the at least an LED light source carrier (4) are provided on the reflector, and wherein the positioning means (3a, 3b, 3c) and / or the fixing elements are adapted to the LED light source carrier (4) on the reflector (3) to fasten, characterized in that the reflector (3) consists at least partially of metallic magnesium containing material.
    [2]
    2. Lighting device (1) according to claim 1, wherein the LED light source carrier (4) contacts the reflector (3) in at least one contact region for the transition of heat of the LED light source carrier (4) towards the reflector (3). wherein in the contact region at least one means for improving the heat transfer from the LED light source carrier (4) towards the reflector (3) is provided.
    [3]
    3. Lighting device (1) according to claim 2, wherein the at least one means for improving the heat transfer from the LED light source carrier (4) towards the reflector (3) copper tracks, copper inserts, heat spreader surfaces and / or thermal paste comprises.
    [4]
    4. Lighting device (1) according to claim 2 or 3, wherein the at least one means extends at least partially up to the at least one LED light source (2).
    [5]
    5. lighting device (1) according to claim 1, wherein the reflector (3) consists of at least 80 weight percent of metallic magnesium.
    [6]
    6. Lighting device (1) according to one of the preceding claims, wherein the reflector has a reflective coating.
    [7]
    7. lighting device (1) according to any one of the preceding claims, wherein the reflector is made by magnesium injection molding.
    [8]
    8. Lighting device (1) according to one of the preceding claims, wherein the LED light source carrier and the reflector have openings for receiving positioning and / or fixing elements.
    [9]
    9. lighting device (1) according to claim 7, wherein the positioning means and / or fixing elements are designed as screws for engagement in the openings.
    [10]
    10. Lighting device (1) according to one of the preceding claims, wherein the reflector has cooling fins.
    [11]
    11. Lighting device (1) according to one of the preceding claims, wherein the LED light source carrier is connected to a heat sink.
    [12]
    12. Lighting device (1) according to one of the preceding claims, wherein the LED light source carrier is designed as a printed circuit board having copper inserts.
    [13]
    13. Lighting device (1) according to any one of the preceding claims, wherein on the reflector additional positioning means are provided for positioning a heat sink to the reflector.
    [14]
    14. Motor vehicle headlight with at least one lighting device (1) according to one of the preceding claims.
    [15]
    15. Motor vehicle with at least one motor vehicle headlight according to claim 14.
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    引用文献:
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    法律状态:
    优先权:
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