• 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:
    Lighting unit (1) for a motor vehicle, comprising a light module (2) and a mirror module (3), wherein the mirror module (3) is adapted to reflect the light emission generated by the light module (2) in the emission direction of the illumination unit (1) characterized by: - the light module (2) comprising at least one light source (4) and a first heat sink (5), - the mirror module (3) comprising a mirror unit (6) and a second heat sink (7), a cooling system (8) comprising at least one inlet (9), at least one outlet (10), at least one duct (11), at least one flow unit (12), a cooling medium, a first cooling sink and a second cooling sink, wherein inlet ( 9) and outlet (10) are connected by the conduit (11), and the flow unit (12) is inserted into the conduit (11) to produce a flow of the cooling medium in the conduit (11), thereby passing the cooling medium through the Inlet (9) sucks and through the outlet ss (10) and the first cooling sink is formed by the first heat sink (5) of the light module (2), and the second cooling sink is formed by the second heat sink (7) of the mirror module (3), the first cooling well downstream the second cooling sink is arranged.
    公开号:AT518220A1
    申请号:T50059/2016
    申请日:2016-02-02
    公开日:2017-08-15
    发明作者:Mayer Matthias；Reinprecht Markus；Mitterlehner Stefan
    申请人:Zkw Group Gmbh；
    IPC主号:
    专利说明:

    Lighting unit for a motor vehicle
    The invention relates to a lighting unit for a motor vehicle, which comprises a light module and a mirror module, wherein the mirror module is adapted to reflect the light emission generated by the light module in the emission direction of the lighting unit.
    In the development of the current headlamp systems is increasingly the desire in the foreground to project a high-resolution as possible on the road surface, which can be quickly changed and adapted to the respective traffic, road and lighting conditions. The term "road surface" is used here for a simplified representation, because of course it depends on the local conditions, whether a photo is actually on the roadway or extends beyond it.In principle, the photograph in the sense used corresponds to a projection on a vertical surface in accordance with the relevant standards relating to automotive lighting technology.
    In order to meet this stated need, among other lighting units have been developed, which form a variably controllable reflector surface of a plurality of micromirrors and reflect a light emission, which generates a light source in the emission direction of the illumination unit. Such lighting devices are advantageous in vehicle construction in terms of their very flexible light distribution, since the illumination intensity can be controlled individually for each pixel and any light distribution can be realized, such as a low beam light distribution, a cornering light distribution, a city light distribution, a motorway light distribution , a bend light distribution, a high beam light distribution or the image of glare-free high beam. For the micromirror arrangement, the so-called Digital Light Processing (DLP®) projection technique is used, in which images are generated by modulating a digital image onto a light beam. In this case, the light beam is broken down into pixels by a rectangular arrangement of movable micromirrors and then reflected pixelwise, either into the projection path or out of the projection path.
    The basis for this technique is a component which contains a rectangular arrangement in the form of a matrix of mirrors and their driving technique and is referred to as "Digital Micromirror Device" (DMD).
    A DMD microsystem is a spatial light modulator (SLM) which consists of micromirror actuators arranged in matrix form, that is to say tiltable reflecting surfaces with an edge length of approximately 16 gm. The movement is caused by the force of electrostatic fields. Each micromirror is individually adjustable in angle and usually has two stable end states, which can be changed within a second up to 5000 times. The number of mirrors corresponds to the resolution of the projected image, where a mirror can represent one or more pixels. Meanwhile, DMD chips with high resolutions in the megapixel range are available. The underlying technology for adjustable mirrors is Micro-Electro-Mechanical Systems (MEMS) technology. While the DMD technology has two stable mirror states, and the reflections can be adjusted by modulating between the two stable states, the Analog Micromirror Device (AMD) technology has the property of adjusting the individual mirrors in variable mirror positions can.
    An essential aspect in the conception of a vehicle headlight or a lighting unit with the DLP® technology is the necessary cooling of the micromirror component. When the component is illuminated with light, about 90% of the light is reflected as intended, but about 10% is absorbed by the component as a reflection loss and converted into heat. The efficiency is predominantly determined by the fact that the individual micromirrors have a distance from one another in order to be able to move. The area between the individual micromirrors is illuminated by the light and thereby heat is absorbed. The heat must be dissipated suitably, for example by a cooling system.
    In addition, the light which is not reflected in the irradiation direction of the illumination unit must be properly absorbed.
    An object of the present invention is to provide a lighting unit with a micromirror component and a cooling system that is particularly inexpensive, compact and effective.
    This object is achieved with a lighting unit of the type mentioned above in that the lighting unit is characterized by: the light module comprising at least one light source and a first heat sink, the mirror module comprising a mirror unit and a second heat sink, a cooling system comprising at least one inlet, at least one outlet, at least one duct, at least one flow unit, a cooling medium, a first cooling sink and a second cooling sink, wherein the inlet and outlet are connected by the conduit, and the flow unit is inserted into the conduit generating a flow of the cooling medium in the conduit, thereby sucking the cooling medium through the inlet and expelling it through the outlet, and the first cooling sink is formed by the first heat sink of the light module, and the second cooling sink is formed by the second heat sink of the mirror module, wherein the first cooling sink s tromab the second cooling sink is arranged.
    The invention makes use of the fact that both the mirror unit and the light source itself are cooled and the advantages according to the invention are achieved by designing a common cooling of these two spatially separate cooling sinks.
    Particularly effective is the appropriate choice in the order of the cooling sinks. Even semiconductor light sources have a high efficiency of currently about 30% compared to conventional light sources, yet a considerable part of the power consumed is converted into heat. As previously mentioned, micromirror components convert about 10% of the incident light energy into heat energy. Consequently, in the case of a single-circuit cooling system comprising both cooling sinks, it is particularly advantageous to first cool the mirror module and then the light module in order not to unnecessarily raise the temperature of the mirror module to the waste-off temperature of the light module. In addition, the waste heat temperature of the mirror module hardly affects the light module.
    According to the previously numerically exemplified efficiencies results in the power loss of the light module to 70% of the light source power and the power loss of the mirror module to 3% of the light source power, determined from 30% (generated light output) multiplied by 10% (mirror losses).
    Since the mirror module reacts much more sensitively to a high operating temperature than the light module due to the integrated electronics, the selected sequence is particularly suitable, which results in a favorable influence, inter alia, on a longer service life of the electronics.
    With regard to a compact construction of the lighting unit, it is advantageous if the flow unit is inserted into the line between the first heat sink and the second heat sink.
    In addition, it is favorable if the first heat sink is inserted into the line upstream of the outlet or is arranged downstream of the outlet in such a way that the first heat sink is cooled by the ejected cooling medium.
    The same applies if the second heat sink is inserted into the line downstream of the inlet or is arranged in front of the inlet such that the second heat sink is cooled by the suctioned cooling medium.
    Depending on the required cooling capacity, it may be advantageous if the line of the cooling system passes through the first heat sink of the light module or rests on this. Likewise, when the line of the cooling system through the second heat sink of the mirror module runs or rests on this.
    Particularly advantageous is the use of the arrangement according to the invention, when the first heat sink of the light module is structurally separated from the second heat sink of the mirror module. A common heat sink would be unfavorable for the operating temperature of the mirror module.
    As the cooling medium, both air, such as ambient air, and a fluid (e.g., cooling fluid or oil) may be selected, as a flow unit corresponding to a fan or a pump. Often, a cycle is created for the cooling medium by the inlet and outlet are connected together and another cooling sink is inserted into the circuit. The choice is made according to a required cooling capacity, which depends inter alia on the light source used and a required light output as well as cost parameters. The line can then be designed as an air duct or as a liquid line.
    The single-circuit design of the cooling system results in cost advantages, a reduced number of system components and a compact design is made possible.
    Particularly advantageous is the use of a semiconductor light source in the light module in order to reduce the generation of waste heat there and consequently make the cooling system compact and inexpensive. Examples include power LEDs and semiconductor lasers. Conveniently, the use of a digital or analog micromirror array (DMD or AMD) in the mirror unit in order to obtain a favorable reflection efficiency and consequently also there to reduce the generation of waste heat and make the cooling system compact and inexpensive.
    The invention and its advantages are described in more detail below by way of non-limiting examples, which are illustrated in the accompanying drawings. The drawings show in:
    1 is a perspective view from the front of a lighting unit according to the invention,
    2 is a top view of the lighting unit with the location of section A-A,
    3 shows the lighting unit in section A-A,
    4 is a perspective view from the side of the lighting unit,
    5 shows a perspective view from the rear of the illumination unit with a second circuit board in front of a heat sink of a mirror module,
    6 is a perspective view from the rear of the lighting unit without the second board in front of the heat sink of the mirror module,
    Fig. 7 is a front perspective view of the cooling system.
    With reference to Fig. 1, an embodiment of the invention will now be explained in more detail. In particular, the important for a lighting unit according to the invention parts are shown, it being understood that a lighting unit contains many other parts that allow a meaningful use in a headlight in a motor vehicle, in particular a car or motorcycle.
    FIGS. 1 to 6 show an overview of an illumination unit 1 for a motor vehicle and in different perspectives. The light emission generated by a light module 2 is reflected at a mirror module 3 in the emission direction of the illumination unit.
    The light module 2 comprises a light source 4, preferably a semiconductor light source, for example a power LED, and a first heat sink 5. The first heat sink 5 and the light source 4 are thermally conductive connected to each other, for example by a direct mechanical contact of these two components.
    The mirror module 3 comprises a mirror unit 6 and a second heat sink 7. The mirror unit preferably comprises a digital or analog micromirror array (AMD, analogue micro mirror device or DMD, digital micro mirror device). The second heat sink 7 and the mirror unit 6 are thermally conductive connected to each other, for example, by a direct mechanical contact of these two components.
    For deriving the heat generated by the light emission, a cooling system 8 is arranged in the lighting unit 1, which comprises an inlet 9, an outlet 10, a line 11, a flow unit 12, a cooling medium, in this case ambient air, a first cooling sink and a second cooling sink.
    The inlet 9 and the outlet 10 are connected by the conduit 11, and the flow unit 12, in this embodiment a fan, is inserted into the conduit 11 to produce a flow of the cooling medium in the conduit 11.
    In this case, the cooling medium is sucked through the inlet 9 and discharged again through the outlet 10, and the first cooling sink is formed by the first heat sink 5 of the light module 2, and the second cooling sink is formed by the second heat sink 7 of the mirror module 3, wherein the first Cooling sink is arranged downstream of the second cooling sink.
    The flow unit 12 is inserted into the conduit 11 between the first heat sink 5 and the second heat sink 7, and the first heat sink 5 is arranged downstream of the outlet 10 such that the first heat sink 5 is cooled by the ejected cooling medium. The second heat sink 7 is arranged in front of the inlet 9 such that the second heat sink 7 is cooled by the sucked cooling medium.
    The first heat sink 5 of the light module 2 is here structurally separated from the second heat sink 7 of the mirror module 3.
    7 shows a detailed view of the portions of the cooling system 8 of the illumination unit 1. For better understanding, no holder and no imaging optics are shown. Shown is the light source 4 with the first heat sink 5, the mirror unit 6, the inlet 9, the outlet 10 and the fan as the flow unit 12.
    LIST OF REFERENCES: 1 illumination unit 2 light module 3 mirror module 4 light source 5 first heat sink of the light module 6 mirror unit 7 second heat sink of the mirror module 8 cooling system 9 inlet 10 outlet 11 line 12 flow unit
    权利要求:
    Claims (13)
    [1]
    claims
    1. lighting unit (1) for a motor vehicle, comprising a light module (2) and a mirror module (3), wherein the mirror module (3) is adapted to the light emission generated by the light module (2) in the emission direction of the lighting unit (1) to reflect, characterized by: - the light module (2) comprising at least one light source (4) and a first heat sink (5), - the mirror module (3) comprising a mirror unit (6) and a second heat sink (7) - a cooling system (8) comprising at least one inlet (9), at least one outlet (10), at least one duct (11), at least one flow unit (12), a cooling medium, a first cooling sink and a second cooling sink Inlet (9) and outlet (10) through the conduit (11) are connected, and the flow unit (12) is inserted into the conduit (11) to generate a flow of the cooling medium in the conduit (11) and thereby the cooling medium sucked through the inlet (9) and through the Au slasher (10), and the first cooling sink is formed by the first heat sink (5) of the light module (2), and the second cooling sink is formed by the second heat sink (7) of the mirror module (3), the first cooling well downstream the second cooling sink is arranged.
    [2]
    2. Lighting unit (1) according to claim 1, characterized in that the flow unit (12) is inserted between the first heat sink (5) and the second heat sink (7) in the conduit (11).
    [3]
    3. Lighting unit (1) according to claim 1 or 2, characterized in that the first heat sink (5) is inserted upstream of the outlet (10) in the conduit (11).
    [4]
    4. lighting unit (1) according to one of claims 1 to 3, characterized in that the first heat sink (5) after the outlet (10) is arranged such that the first heat sink (5) is cooled by the ejected cooling medium.
    [5]
    5. Lighting unit (1) according to one of claims 1 to 4, characterized in that the second heat sink (7) is inserted downstream of the inlet (9) in the conduit (11).
    [6]
    6. lighting unit (1) according to one of claims 1 to 5, characterized in that the second cooling body (7) in front of the inlet (9) is arranged such that the second cooling body (7) is cooled by the sucked cooling medium.
    [7]
    7. Lighting unit (1) according to one of claims 1 to 6, characterized in that the line (11) of the cooling system (8) through the first heat sink (5) of the light module (2) extends or rests on this.
    [8]
    8. lighting unit (1) according to one of claims 1 to 7, characterized in that the line (11) of the cooling system (8) through the second heat sink (7) of the mirror module (3) extends or rests on this.
    [9]
    9. lighting unit (1) according to one of claims 1 to 8, characterized in that the first heat sink (5) of the light module (2) from the second heat sink (7) of the mirror module (3) is structurally separated.
    [10]
    10. Lighting unit (1) according to one of claims 1 to 9, characterized in that the cooling medium is air, preferably ambient air, and the flow unit (12) is a fan.
    [11]
    11. Lighting unit (1) according to one of claims 1 to 10, characterized in that the cooling medium is a Lluid, preferably a cooling liquid or oil, and the flow unit (12) is a pump.
    [12]
    12. Lighting unit (1) according to one of claims 1 to 11, characterized in that the light module (2) comprises at least one semiconductor light source, preferably at least one power LED or at least one semiconductor laser.
    [13]
    13. Lighting unit (1) according to one of claims 1 to 12, characterized in that the mirror unit (6) comprises a digital or analog micromirror array.
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50059/2016A|AT518220B1|2016-02-02|2016-02-02|Lighting unit for a motor vehicle|ATA50059/2016A| AT518220B1|2016-02-02|2016-02-02|Lighting unit for a motor vehicle|
    US16/074,193| US10641455B2|2016-02-02|2017-01-13|Motor vehicle lighting unit with heat sink|
    PCT/AT2017/060005| WO2017132713A1|2016-02-02|2017-01-13|Lighting unit for a motor vehicle|
    KR1020187024773A| KR102088228B1|2016-02-02|2017-01-13|Automotive lighting unit|
    CN201780009297.XA| CN108700270B|2016-02-02|2017-01-13|Lighting unit for a motor vehicle|
    ES17702755T| ES2775434T3|2016-02-02|2017-01-13|Lighting unit for a motor vehicle|
    EP17702755.4A| EP3411625B1|2016-02-02|2017-01-13|Lighting unit for a motor vehicle|
    JP2018558450A| JP6793756B2|2016-02-02|2017-01-13|Irradiation unit for automobiles|
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