JP2009070821A - Illumination device equipped with semiconductor light source - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve thermal discharge efficiency of an illumination device in a simple and inexpensive method. <P>SOLUTION: The illumination device (1) includes an air duct (8) with a periphery sufficiently sealed, and the air duct includes a main body extending vertically positioned nearly horizontally, and means (9) for actively sending air through the air duct (8). Then, at least a part of a heat sink (6) is arranged in air flows (11, 11a, 11b, 12, 12a, 12b) carried through the air duct (8). In order to realize an AFS function for curved roads, preferably, the heat sink (6) as well as a light module (5) of the illumination device (1) can be moved against the fixed air duct (8). The air duct (8) is formed so that a plurality of heat sinks (6) of various light modules (5, 5a, 5b) of the illumination device (1) can be cooled by only one fan (9). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lighting device having at least one semiconductor light source connected to a heat sink for heat dissipation.

  Such illumination devices are known from the prior art. For example, European Patent No. 1643188A1 discloses an automotive headlight having a light emitting diode system as a semiconductor light source. The semiconductor light source is connected to a heat sink for heat dissipation. The semiconductor light source is housed in a headlight housing together with a heat sink. Inside the housing, when the semiconductor light source operates, an air flow is formed by convection or by using a fan, and heat is drawn from the heat sink by this air flow. Variously formed heat exhaust elements are arranged in the air flow, and these elements are connected to the housing in order to extract heat from the housing as efficiently as possible.

In known headlights, the fan is used only to assist or enhance thermal convection. In this case, the direction of air flow is not affected by the use of a fan. In particular, it is not bent in a direction different from the direction of air flow by convection.
European Patent No. 1643188A1

  The object of the present invention is to start from the prior art and improve and develop known lighting devices to improve the efficiency of heat dissipation in the simplest and cheapest way possible.

  In order to solve this problem, the following is proposed starting from the lighting device of the type mentioned at the beginning. That is, the lighting device of the present invention has an air duct and means for actively sending air through the air duct, and the air duct has a body that extends substantially horizontally and is sufficiently closed around. It is what. In this case, it is assumed that at least a part of the heat sink is disposed in the air flow carried by the air duct.

  That is, according to the present invention, an air duct is formed inside the lighting device, and the air flow generated by the conveying means flows through the air duct. This air duct is preferably formed inside the housing of the lighting device. One or more partition walls of the housing can then be part of the air duct. What is important, however, is that at least one additional partition, or at least one air guide element, is provided inside the luminaire, and if necessary, these wrap around well with other luminaire housing partitions or with a heat sink. The air flow for forming a closed independent air duct and extracting heat from the heat sink is able to flow through this air duct particularly efficiently. Therefore, an important aspect of the present invention is whether the airflow for cooling the heat sink is simply by convection or by at least one fan, such as being distributed over a large volume inside the lighting device housing. It is free and almost arbitrary. Rather, this air flow is forced through a well-closed air duct and in a desired and specified direction. Since the air duct extends substantially horizontally, the cooling air flow also flows substantially horizontally within the air duct.

  In one preferred development of the invention, the means for actively conveying air comprises a fan. The fan can inhale and / or exhale air. This fan can be provided inside the air duct to suck in air from one side of the air duct and carry this air toward the other side of the air duct. Alternatively, a fan can be provided outside the air duct, and the sucked air can be blown through the entire air duct, or the fan can suck air from the entire air duct. Regardless of its arrangement, the fan produces a cooling air flow in a substantially horizontally extending air duct, which flows in a direction essentially different from, preferably across, the normal convection direction. .

  One preferred embodiment of the present invention proposes to provide a receptacle for attaching the semiconductor light source to the heat sink. Furthermore, it is proposed to provide the heat sink with a receptacle for attaching the reflector of the lighting device, a receptacle for attaching the lens of the lighting device, and / or a receptacle for attaching the shade of the lighting device. In this way, a particularly simple and inexpensive structure of the lighting device can be realized. Furthermore, this heat sink can be handled as a support element, together with a semiconductor light source and possibly as an integral part of a reflector, lens and / or shade of a lighting device (so-called light module) and moved relative to the housing. it can. The movement of the light module is, for example, in order to realize an AFS function for curved roads (in this specification, “light distribution variable type headlamp system” is abbreviated as AFS), or a low / high beam AFS function. In order to realize this, it is conceivable to perform in the vertical direction. A light module having a semiconductor light source and a reflector is also referred to as a reflection module, and a light module having a lens, and optionally a shade, is also referred to as a light projecting module.

  One particularly preferred embodiment of the invention proposes that the heat sink is provided with a light module that operates according to the principle of reflection or a part of the light module that operates according to the principle of projection. Preferably, a so-called primary optical system for focusing the intersecting lines sent from the semiconductor light source is provided in front of the semiconductor light source. This condensing optical system has a light incident surface and a light emitting surface. The light beam emitted from the semiconductor light source is incident through this light incident surface, and the light beam focused by the condensing optical system is emitted from this light emitting surface. Inside the condensing optical system, the light beam is focused by total reflection. The light module operating on the principle of reflection further has a secondary optical system, which has a reflector shape, preferably a so-called concave reflector shape. This concave reflector is provided above and / or below the heat sink. A semiconductor light source for the light module operating according to the principle of reflection is preferably arranged above and / or below the heat sink so that its light beam is sent up or down in the direction of the semi-linear beam of the reflector. To.

  A light module that operates on the principle of projection typically comprises a secondary optical system formed as a projection lens in addition to a reflector. In addition, a shade with an upper end is usually disposed between the semiconductor light source or the primary optical system and the secondary optical system. The light projection lens projects the upper end of the shade as a light / dark boundary on the traveling road surface in front of the vehicle. The secondary optical system is preferably disposed in front of the heat sink when viewed in the direction opposite to the light emitting direction of the illumination device. Similarly, the light source of the light module operating on the principle of projection is also arranged in front of the heat sink.

  The lighting device preferably includes a plurality of semiconductor light sources instead of only one.

  The air duct preferably includes at least one air intake and at least one air outlet. The fan sends an air flow from the at least one air intake to the at least one air outlet. In order to cool the heat sink particularly efficiently, it can be arranged, for example, before one of the air intakes or after the air outlet. In this case, the air flow drawn into or out of the air duct results in particularly efficient cooling of the heat sink.

  In one preferred development of the invention, particularly efficient cooling of the heat sink is obtained by placing at least a part of the heat sink in the air stream. According to this development, an opening is provided in at least one partition of the air duct, and at least a portion of the heat sink projects into the air duct from this opening.

  One preferred embodiment of the present invention comprises providing the lighting device with a housing having a light exit opening that is directed in the light exit direction and closed with a cover glass, wherein airflow is applied to the inner surface of the cover glass. It is proposed to arrange an air duct in the housing to flow in contact and to direct the air flow flowing in contact with the heat sink. That is, in this embodiment, the heat received by the airflow from the heat sink is used for defrosting and / or dehumidifying the inner surface of the cover glass. Combining this with a well-closed air duct according to the invention has the following special advantages: That is, the shape and arrangement of the air duct can be formed so that the air flow that flows through the air duct can be directed in almost any direction with respect to the area of the cover glass to be defrosted. However, the air flow according to the conventional technology almost flows while contacting a large area of the entire inner surface of the cover glass. In the present invention, the area of the cover glass to be defrosted can be placed, for example, below the cover glass. In that case, the air flow can be raised along the inner surface of the cover glass by conventional convection. it can.

  Another preferred embodiment of the invention proposes to provide the lighting device with a housing, which is provided with a light exit opening that is directed in the light exit direction and closed with a cover glass. In this case, the air flow is disposed in the housing and directs the air flow flowing in contact with the heat sink such that the air flow flows in contact with other energy consuming devices disposed in the housing. In this embodiment, the air flow sent in the air duct is utilized not only for cooling the heat sink, but also for cooling other energy consuming devices inside the housing of the lighting device. Such an energy consuming device to be cooled is, for example, a control unit of a lighting device or a part of a control unit.

  In order to improve the heat dissipation from the luminaire housing, at least one heat pipe, at least one thermosiphon and / or at least one Peltier element is arranged behind the heat sink as viewed in the direction of air flow. A heat pipe, thermosiphon, or Peltier element can be placed in the air duct itself to extract heat from the air stream and exhaust this heat from the housing in a suitable manner. However, a heat pipe, thermosiphon, or Peltier element is also placed behind the air outlet of the air duct to extract heat from the air stream that is heated and exits the air duct, and this heat is removed from the housing in an appropriate manner. It is also possible to discharge.

  One advantageous development of the invention consists in that the air duct has a longitudinally extending body, with openings at both ends of the air duct and means for sending air in the air duct, the air duct It is arranged on one of the end portions. This development thus forms one of the openings in the air duct as an air intake and the other opening as an air outlet. The fan is placed in front of the air intake or behind the air outlet and blows air into or out of the air duct.

  An embodiment different from the above of the present invention is such that the air duct has a main body extending vertically, and openings are provided at both ends of the air duct, but another opening is formed at substantially the center of the main body extending vertically of the air duct. Suggest to do. In front of this opening, means for sending air by air ducts are arranged. In this embodiment, both openings at the end of the air duct are formed as air outlets. Another opening in the center of the air duct is formed as an air intake. In the case of this embodiment, the air flow sent into the air duct is divided into Y-shapes, distributed to both the tributaries of the air duct, and reaches the air outlet.

  The air duct has a main body extending vertically in a substantially straight line in a three-dimensional space. However, one particularly preferred development of the invention proposes to curve the air duct around an axis that is substantially vertical and also perpendicular to the optical axis. The heat sink preferably takes the form of a curved air duct. This curved shape of the heat sink and air duct is particularly advantageous in the following cases. This is a case where the light module can be turned in the horizontal direction together with the heat sink in order to realize the AFS function for curved roads. When the air duct is swiveled with a heat sink and other light modules, this curved shape can reduce the required mounting space behind the light modules to a minimum.

  In addition, it is conceivable to curve the air duct around an axis that is substantially horizontal and crosses the optical axis. The heat sink is preferably in the form of a curved air duct. This curved shape of the heat sink and air duct is particularly advantageous in the following cases. This is a case where the light module can be turned in the vertical direction together with the heat sink in order to realize the low / high beam AFS function.

  Another embodiment of the invention proposes to form the air duct in a cruciform shape with a first partial duct extending substantially horizontally and another partial duct extending substantially vertically across it. . In this case, openings are provided at all four ends of the air duct, another opening is formed at substantially the cross point of the cross, and means for sending air through the air duct is arranged in front of the latter opening. . When the air duct is formed in a cross shape, the openings at the four ends of the partial duct are formed as air outlets. Another opening provided approximately at the intersection of the two partial ducts is formed as an air intake. The one or more heat sinks are preferably arranged in a cruciform shape, also corresponding to the air duct, or formed accordingly. The lighting device formed in this way is suitable for realizing a complicated semiconductor light source light module. A well-closed air duct allows the cooling air flow to flow as much as possible through the entire heat sink of the lighting device or as much as possible in all the heat sinks of the various light modules of the lighting device. As a result, even if the lighting device includes a semiconductor light source and has a complicated structure and a high degree of integration, effective heat discharge can be obtained. Without an air duct, and without a targeted guide of the cooling air flow along such a complex and highly integrated lighting system, sufficient cooling is impossible. Furthermore, by using a well-closed air duct and guiding the air flow in a targeted manner, even in the case of complex lighting devices, the number of fans can be reduced and only one Can only be a fan. As a result, the lighting device of the present invention reduces the required installation space and cost. This is naturally true even when the complexity of the lighting device is low or the degree of integration is low.

Advantageously, the heat sink comprises a cooling fin, which protrudes into the air duct through an opening in at least one partition of the air duct. The longitudinally extending body of the cooling fin is substantially parallel to the longitudinally extending body of the air duct.
In addition, it is proposed that the cooling fin is in an oblique position in the air duct as seen in its cross section.

  One particularly advantageous development of the invention is that the air duct is placed in a fixed position in the luminaire housing, and the heat sink that is part of the light module of the luminaire is centered on a substantially vertical pivot axis. Then, it is proposed that the housing can be turned. Thus, with this development, if the light module can be swiveled, the heat sink is swiveled with the light module, for example, to realize a curved road AFS function. In this case, an air duct that is relatively large and takes up space is arranged in a fixed manner in the lighting device housing. Thus, the heat sink moves in a substantially horizontal direction with respect to the air duct as the light module pivots. This can be accomplished, for example, by providing an opening in the air duct that can receive a heat sink or a portion of a heat sink. In this case, the opening of the air duct is sized so that the heat sink or a part thereof can move relative to the air duct in the opening. A radial collar is formed on the heat sink so that the air duct is sufficiently closed, and this collar receives air to receive the heat sink or part of it regardless of the position of the heat sink relative to the air duct. Sufficiently cover the duct opening. The collar in this case is placed at a distance relative to the air duct or to the air duct partition surrounding the opening, which is such that the heat sink can move freely with the light module relative to the air duct. Set a proper interval. Advantageously, the heat sink is curved about a vertical axis, and this axis and the pivot axis of the light module are congruent.

  One particularly preferred embodiment of the invention forms the air duct in a substantially U-shaped cross section so that at least a part of the heat sink is placed in front of the open side of the air duct, so that the open side is fully Suggest to close. Even when one of the sides of the air duct is formed open, the present invention still allows for a sufficiently closed air duct. In the case of the prior art, there is no air guiding means, and a large volume of air flows relatively freely through the entire inside of the housing. On the other hand, it is important to forcibly guide the air flow in a desired state by an air duct. Is a point.

  In one particularly preferred embodiment of the present invention, the lighting device is provided with a plurality of light modules and a plurality of heat sinks, and in forming an air duct, the air sent through the air ducts has a plurality of heat sinks of various light modules. Form to be used for cooling. This embodiment is particularly suitable for a complex and highly integrated lighting device having a semiconductor light source. Particularly in the case of such a lighting device, according to this embodiment, the cooling means for discharging heat from the heat sinks of various light modules can be formed easily and inexpensively. In this case, effective cooling of the heat sink can be obtained at the same time.

  Preferred embodiments of the present invention will be described in detail below with reference to the drawings.

  In FIG. 1, reference numeral 1 is assigned to the entire illumination device according to the present invention. The illuminating device 1 is formed as an automobile headlight in the illustrated embodiment. The lighting device 1 includes a headlight housing 2, which is preferably made of plastic. An opening is formed in the light projection direction 3 of the housing 2, and this opening is closed by a light-transmitting cover glass 4. The cover glass 4 is preferably formed without using an optically acting element. However, it is also conceivable that the cover glass 4 is provided with an optically acting element, and this element is used to form a desired light distribution.

  A light module 5 is disposed inside the headlight housing 2, but only a part of the module is shown for easy understanding of the whole. FIG. 1 shows a heat sink 6 of the light module 5, which is used simultaneously as a support element for a plurality of semiconductor light sources 7. The heat sink 6 is made of a material having good thermal conductivity, for example, aluminum, copper or other metal. The semiconductor light source 7 is formed as a light emitting diode (so-called LED). The illustrated embodiment has a lighting device 1 formed as a car headlight, but in this embodiment, the light emitting diode 7 preferably emits white light.

  In FIG. 1, the other components of the light module 5 are not shown. The other parts are, for example, primary optical systems arranged in front of the individual LEDs 7, and are formed as, for example, a condensing optical system. This condensing optical system usually has a light incident surface and a light emitting surface, and the light incident on the condensing optical system is converged by total reflection and goes out of the emitting surface again. The light module 5 includes a secondary optical system, for example, in the shape of a reflector, preferably in the shape of a concave reflector (in the reflection module), or in the shape of a light projection lens (in the light projection module). The light beam emitted from the LED 7 is adjusted by the secondary optical system, and in some situations, cooperates with the optical element of the cover glass 4 to produce a desired light distribution of the illumination device 1. The light module 5 includes a shade with an upper end, and the upper end is projected as a light / dark boundary on the road surface of the automobile by a light projection lens.

  In addition, an air duct 8 that is sufficiently closed is formed inside the headlight housing 2, and at least one heat sink 6 is provided in the air duct. In the illustrated embodiment, in particular, the cooling fins 6 ′ of the heat sink 6 are provided inside the air duct 8. The air duct 8 includes a vertically extending main body and discharge ports 8a and 8b, one at each end. An air intake 8c is formed in the approximate center of the back wall of the air duct 8, and a fan 9 is provided in front of the intake. The fan 9 is preferably formed as a cross flow fan and sucks air 10 from the inside of the headlight housing 2 and sends it to the air duct 8. The sucked air 10 is divided into two air streams 11a and 11b in opposite directions inside the air duct 8. The air flows 11a and 11b are conveyed from the air intake port 8c toward the air discharge ports 8a and 8b on both sides, and exit from the air discharge port 8. The air exiting from the air duct 8 is indicated by reference numerals 12a and 12b.

  Particularly advantageous in the case of the lighting device 1 according to the invention is that a sufficiently closed air duct 8 is provided inside the headlight housing 2 and exhausts heat from the heat sink 6 of the light module 5, so that the air The flow 11 a, 11 b, 12 a, 12 b passes through this air duct and is transported along a designated path strictly defined without depending on the heat convection inside the housing 2. This targeted orientation of the cooling air flow is only possible by means of suitable air guiding means, for example an air duct 8 which is sufficiently closed. In the prior art, the entire air inside the headlight housing 2 is kept in motion to obtain sufficient cooling of the LED, in any case more or less uncontrolled. Unlike the prior art, the present invention, instead of being fixed in path and direction, has a relatively small amount of air that is maintained in motion, thus, with as little effort as possible and as much as possible. Effective and efficient heat sink cooling is obtained. Since the cooling of the heat sink 6 becomes extremely effective, the installation space for the headlight 1 can be reduced. First, a smaller amount of air inside the housing is sufficient to obtain sufficient cooling of the heat sink 6. Next, only one fan 9 is sufficient to maintain a relatively small amount of air in the air flow 11a, 11b, 12a, 12b in motion and to obtain sufficient cooling of the heat sink 6.

  The heat sink 6 has two LEDs 13 and other light modules 5 arranged thereon, for example, a light module for realizing an AFS function for curved roads, and directions of two arrows 13 around a pivot shaft 14 extending substantially horizontally. It can be formed to be pivotable. In this case, the air duct 8 is preferably attached to the headlight housing 2 in a fixed position so that the air duct 8 cannot pivot about the pivot axis. Therefore, in the case of the curved road AFS function, the light module 5 or the heat sink 6 moves relative to the air duct 8. In order to allow the heat sink 6 of the light module 5 to move freely in the direction of the two arrows 13 in the air duct 8, one opening is formed in the partition wall 8d on the front side of the air duct 8, and the heat sink 6 or A part of the heat sink, in particular the cooling fins 6 ′, can protrude into the air duct 8. This opening in the front partition 8d is chosen to be very large in this case, so that the heat sink 6 can move freely with respect to the air duct 8 about the pivot axis 14 and the AFS function for curved roads To be satisfied.

  It is conceivable to seal at least a part of the opening formed in the front partition 8d of the air duct 8 so that the air duct 8 is sufficiently closed. This can be done, for example, with an elastic sealing lip, which is pressed against the heat sink 6 so that the heat sink 6 passes through the air duct even though the air duct 8 is sufficiently sealed. Be able to move freely. Further, for example, a radial collar may be formed around the heat sink 6. This collar always covers the entire opening formed in the front partition 8d without depending on the relative position of the heat sink 6 with respect to the air duct 8. Thus, when the heat sink 6 moves in the direction of the arrow 13 relative to the air duct 8, the radial collar of the heat sink 6 moves relative to the front partition 8 d of the air duct 8. A space is formed between the radial collar of the heat sink 6 and the front partition 8 d of the air duct 8 so that the heat sink 6 can move freely relative to the air duct 8. This spacing should be as small as possible so that the air duct is sufficiently sealed. As an alternative or in addition, it is also possible to provide sealing means in this space, in particular sealing means in the form of sealing lips.

  Therefore, “sufficiently closed around” in the present invention does not mean that the air duct is hermetically sealed. In any case, the air duct is not airtight because of the air outlets 8a and 8b. In addition to the air outlets 8a and 8b, other openings are provided in the partition wall of the air duct 8, for example, the light module 5, especially the heat sink 6 or the heat sink parts, especially the cooling fins 6 ', and the air duct. 8 can be guided inside. Therefore, “sufficiently closed” in the present invention means that an air flow from the air intake port 8c to the air discharge ports 8a and 8b is provided inside the air duct, thereby sufficiently cooling the heat sink 8. It means that the air duct 8 is sealed to such an extent that an air flow can be generated and maintained. What is important is that the air flow has one direction, which is mainly determined by the shape and arrangement of the air duct 8, but not by other factors, such as convection inside the headlight housing 2. .

The present invention provides a precondition for sufficiently cooling a new type of high power LED. This is to continue to comply with such LED specifications, particularly those relating to the maximum operating temperature, during headlight operation. In order to technically introduce a new generation high-power LED, efficient temperature management is necessary in order to ensure that the energy lost during operation can be discharged. Such LEDs today have an output of a few watts per LED and most of this output is exhausted as heat. If multi-chip LEDs are used here, for example, a power density of 1 watt to 10 watts / cm ² is produced on the LED motherboard. The lighting device 1 of the present invention comprises a compact modular light source with high power LEDs, which is actively cooled by a forced air flow. This allows for the continuous operation of the high power LEDs provided in the headlight for the first time.

  In addition, since the relative arrangement of the air duct 8 with respect to the headlight housing 2 is fixed, the mass of the light module 5 moved within the AFS function for curved roads is reduced. For this reason, faster positioning speeds and / or smaller sized drive devices can be used.

  By cooling the LED 7 efficiently, a completely new possibility in design is obtained. This is because the LEDs 7 have improved heat dissipation and can be arranged side by side closer to each other than before. Since the fan 9 can be mounted in various ways, the mounting space can be used well according to the individual case. The illuminating device 1 of the present invention has a modular structure, which enables a wide and general replacement of the entire light module 5 in the headlight 1. For example, it is a replacement to upgrade with a higher performance or other color LED 7 to add lighting function, repair, etc. In addition, in order to heat a specific part of the headlight 1, in particular to heat the cover glass 4, the hot air streams 12 a and 12 b can be used in a targeted manner. Thereby, for example, during the winter season, defrosting of the outer surface of the cover glass 4 can be realized by simple means. Furthermore, the air circulation in the headlight housing 2 forced by the fan 9 can be tailored to efficiently cool other (usually passively cooled) energy consuming devices such as control units. Can be used. It is also conceivable to combine the cooling according to the invention, which accelerates heat transfer, with thermosiphons, heat pipes and / or Peltier elements.

  In order to comply with the maximum allowable barrier layer temperature (limit temperature) specified by the LED manufacturer, not only the ambient temperature, the housing temperature and the output of the LED itself, but also the thermal resistance of the air duct 8 is important. When the thermal resistance is sufficiently small, the operating temperature of the LED is below the limit temperature specified by the manufacturer.

  With the following embodiment of the lighting device 1 according to the invention, the thermal resistance of the air duct 8 is clearly reduced from about 5 K / W typical in the case of free convection to 1 K / W, so that the LED 7 is at its highest output. And it can be operated at maximum light intensity.

  The high output LED 7 is fixed to the metal heat sink 6. The fan 9 is fixed to a desired intake of the heat sink 8. In the embodiment shown in FIGS. 2 a and 2 b, the heat sink 6 already forms two partitions (front and rear) of the air duct 8. In order to form the air duct 8 as being sufficiently closed, it is only necessary to provide the back wall 8e and the cover 8f on the heat sink 6 or the cooling fin 6 '. As a result, a sufficiently closed air duct 8 is obtained. The sucked air 10 is then blown by the fan 9 from the air intake into the air duct 8, and the heated air 12 exits from the air duct through the air outlet.

  When the LED 7 is switched on, the heat sink 6 is heated. The heat sink is made of, for example, an aluminum alloy or a copper alloy. When the fan 9 is switched on, an air flow is generated in the air duct 8, so that the energy carried in the heat sink 6 by heat conduction is released into the flowing air.

  Depending on the geometry of the cooling fins 6 '(thickness, fin spacing, fin length), the selection of the fan 9 (volume flow of air), the choice of heat sink material (thermal conductivity), the LED 7 with respect to the air flow Depending on the length (the material thickness that affects the heat flow), the thermal resistance of the air duct 8 to a given LED output can be 1 K / W or less. As a result, it is possible to reliably prevent today's LED 7 from overheating during the headlight operation. In this case, the ambient temperature up to 85 ° C. is usually dominant.

  The hot air flowing out from the discharge opening of the air duct 8 is used to defrost the cover glass 4 of the full LED headlight 1 on the outlet side of the air duct by arranging or arranging the shape of the air duct 8 accordingly. It is effective if used. Compared to classic automobile light sources such as halogen lamps or gas discharge lamps, the properties imparted to the LED 7 make it necessary to emit almost no heat rays in the wavelength region longer than 800 nm as a “cold light source”. The exception is only infrared LEDs, which typically have a wavelength of 850 nm.

  The embodiment of FIGS. 2a and 2b shows an LED-based high beam module. A reflector (not shown here) is provided on the two high power LEDs 7 oriented horizontally. Another LED 7 mounted in the center has a smaller output and is directed forward and can be used for position lights or cornering lights.

  The embodiment shown in FIGS. 2a and 2b is a special case where the installation space is limited. Of course, if there is enough space in the headlight housing 2 or in the front end of the car, an air duct 8 is placed directly under both high power LEDs 7 to provide a thermally effective A solution can be realized. Focusing on the individual cooling fins 6 'and accepting the volume flow of the refrigerant as a given condition, the heat flow through the fins 6' depends on the cooling fin material used and the cooling fin cross-sectional area. This cooling fin cross-sectional area is obtained from the vertical and horizontal products of the fin cross-section. The longer the cooling fin 6 ', the greater the resulting cooling fin surface area. Beyond a certain fin length (fin length limit), the thermal energy transferred from the fin surface to the air no longer increases. This is because the material cross-sectional area of the fin foot limits the heat flow.

  The technical problem here is that the fin geometry of the heat sink 6 with the optimum cooling fin 6 'length obtained by calculation or experiment is adapted to the fan 9 in many cases with a relatively small blow-off cross-sectional area. Imposed. The embodiment shown in FIGS. 2a and 2b solves this problem by placing the fins 6 'in an oblique position. This makes it possible to realize a “central” cooling fin that is important for cooling, that is, a cooling fin having an optimal length, even if the mounting space behind is limited. Observing from the flow profile of the fan 9, this places the cooling fins 6 'in the maximum mass flow region of air.

  Even if the fin 6 'is in an oblique position, the fin above the intake is cut diagonally so that the region above the air duct 8 does not flow and is technically blocked. Viewed in cross-section, the resulting air duct 8 distributes the air flow evenly throughout the height of the heat sink 6.

  Figures 3a and 3b show another embodiment. This embodiment is suitable when the installation space is narrow, for example, because the rear region is partitioned by the headlight housing. These figures show a low beam module, where each one high power LED 7 (upper and lower, reflectors not shown) is responsible for the reference light distribution and the central three LEDs 7 are responsible for spotlight generation. The secondary optical system of the central three LEDs 7 in the form of a projection lens is also not shown in FIGS. Since the air duct 8 has a curved shape, this embodiment is particularly suitable for use in the AFS function for curved roads. This is because when the light module 5 rotates, no additional mounting space is required behind it. However, when the air duct 8 flows through, the additional temperature rise of the air is disadvantageous in itself, but not so many LEDs 7 are arranged side by side as in the illustrated embodiment, and the heat As long as a material having good conductivity is used for the heat sink 6, there is no problem with this additional temperature increase of air. This structure can also be used for static cornering lights. This is because, in this case, not all LEDs 7 emit light simultaneously for a relatively long period of time, and therefore the additive temperature rise is not a significant problem.

  In the case of the embodiment shown in FIGS. 3a and 3b, the air duct 8 is bounded in three directions, ie upward, forward and downward, with respect to the heat sink 6 or cooling fin 6 '. In order to realize a sufficiently closed air duct 8, it is only necessary to cover the heat sink 6 or the cooling fin 6 'with the back wall 8e, preferably a plastic back wall. The air duct 8 obtained there (except of course the air inlet through which the fan 9 sends air into the air duct 8 and the two air outlets 8a, 8b) is therefore sufficiently closed. By guiding the air flow through the air duct 8, in this embodiment, the hot exhaust air is directed to the front cover glass 4, which provides a good heat exchange with the surroundings and the cover Local frost formation of the glass 4 is prevented.

  The other embodiment described in FIGS. 4a and 4b is superior to the above two embodiments, in particular in the following points. That is, in this example, by distributing the air flow to the two outlets 8a and 8b, a large additive temperature rise does not occur in the individual LEDs 7. In addition, the “inside” LED mounting surface 6 a of the heat sink 6 is directly blown with air to be cooled particularly efficiently.

  By allocating the airflows 11a and 11b, the range in which the cover glass can be defrosted is larger than in the embodiment of FIGS. 3a and 3b. 4a and 4b, the light module 5 having two or more air discharge ports 8a and 8b can be realized according to the number and arrangement of the LEDs 7. FIG. 5 shows an example in which the air duct 8 is formed in a cross shape in the corresponding embodiment. For each individual air duct or partial duct, the length and cross section can be different. It is therefore possible to adapt to different conditions for different LED outputs and mounting spaces available inside the headlight housing 2.

  Common to all the embodiments shown in FIGS. 2a to 5 is that the fan 19 can be rotated with almost the same efficiency at an angle with respect to the air inlet 8c or with respect to the geometry of the cooling fin 6 ′ from 0 ° to 360 °. This is a possible point. Thereby, the direction of the air sucked into the headlight 1 can be controlled. Using the fan 9 for the blowing operation has an advantage that the heated exhaust of the LED 7 does not directly hit the fan 9 as compared with the suction operation. As a result, the life of the fan is improved, or when the fan 9 is selected, an advantageous variation can be adopted even if the heat resistance is low, which provides a cost advantage. In all the light modules 5, the cooling fins 6 ′ of the heat sink 6 can be used not only by their technical functions but also as design elements of the headlight 1.

  The examples of FIGS. 6a-24 are now described in detail, which illustrate various embodiments of the illumination device of the present invention. In the case of these embodiments, the light module 5 together with the heat sink 6 can be moved relative to the air duct 8 as in the example of FIG. This is because, for example, an AFS function for curved roads is realized. One way to actively cool the movable light module 5 is to move the air duct 8 and the fan 9 together with the heat sink 6 and other light modules 5. However, this type of embodiment has the disadvantage that a relatively large mass has to be moved and therefore a particularly powerful servomotor has to be used and / or only a relatively slow alignment acceleration can be obtained. It becomes. Another way to actively cool the movable light module 5 is to use a fixed fan 9 in combination with a flexible air duct 8 fixed to the heat sink 6. However, according to this, a relatively large force must be applied by the servo motor, and the functional stability of the AFS function for curved roads cannot be obtained.

  From the embodiment of FIGS. 6a to 24, the preconditions for sufficiently cooling a new kind of high power LED incorporated in the light module 5 are obtained. This is particularly for sufficiently cooling the AFS module for curved roads that dynamically turns with the LED light source 7. The present invention achieves this at as low a cost as possible, while at the same time providing functional stability. Furthermore, the embodiments described here of the lighting device 1 according to the invention are not limited to this, even when a plurality of independent LED light modules 5 are combined with a dynamically turning AFS module for curved roads. Open the possibility of cooling with one fan 9.

  One important aspect of the present invention is that the fan 9 is used to actively cool the high power LED 7 for the fixed light module 5 and for the dynamically movable AFS module for curved roads. The heat sink 6 of the AFS module for curved roads moves in the air duct 8. In this case, the heat sink 6 and the air duct 8 are arranged so that they do not contact each other. In addition, the plurality of light modules 5 are also cooled by an air duct distributor having a fan 9. It is also possible to combine the fixed light module and the movable light module 5. This can be achieved with minimal mounting space.

  With this active cooling, the LED 7 can be operated at maximum power in all operating states and over the required temperature range. Both the light module 5 and the light module 5 can be cooled by a single fan 9. The LED 7 can be strongly cooled also by the heat sink 6 that is constantly moving in the AFS module 5 for the curved road. The mass moved by the AFS module 5 for curved roads is reduced to a minimum. This is because the fan 9 and the air duct 8 are arranged separately from the other light modules 5. Since the heat sink 6 is assigned to the air duct 8 or the fan 9 in a non-contact manner, nothing prevents the movement of the curved road AFS module 5. Since the servo motor of the AFS module 5 for curved roads only needs to generate a relatively small force, cost reduction can be obtained. Although the heat sink 6 and the LED 7 are strongly cooled, a minimum installation space is sufficient. Since only one fan is required for the plurality of LED light modules 5, the lighting device 1 of the present invention reduces the cost. Another cost reduction is obtained by the fact that the air duct 8 can also be used as a support part at the same time.

  6a to 9b show the first embodiment of the lighting device according to the invention as seen from various viewpoints. The AFS module 5 for a curved road includes a heat sink 6 including three LEDs 7 directed forward and a primary optical system that is a condensing optical system 15. This condensing optical system is fixed to the internal frame 16. The inner frame 16 is attached to an outer support frame 17 so as to be able to turn around a vertical turning shaft 14. The support frame is attached to the headlight housing 2 in a state where the vertical direction can be adjusted, for example. Reference numerals 17a and 17b are assigned to the corresponding bearing locations. Accordingly, the illustrated light module 5 can be turned around the horizontal axis passing through the mounting locations 17a and 17b together with the outer support frame 17. This turning is performed for, for example, a low / high beam AFS (ALWR).

  The air duct 8 has partition walls only on the upper side, the rear side, and the lower side. The entire front partition 8d of the air duct 8 is open in the case of the embodiment of FIGS. 8a to 9b. A part of the heat sink 6, in particular the cooling fin 6 ′, protrudes into the air duct 8 through this opening. Although the air duct 8 is open on the front side, it can be said that the air duct 8 is sufficiently closed in this embodiment as well. Active cooling of the LED 17 in the headlight 1 using the fan 9 is known from the prior art, but in comparison, the air duct according to the embodiment of FIGS. It becomes possible. That is, in the region of the cooling fins 6 'of the heat sink 6, a targeted and locally limited air duct is formed, which allows the heat sink 6 and the LED 7 to be cooled particularly effectively. By the fan 9, the back surface of the heat sink 6 is blown directly into the area of the cooling fin 6 '. Since there is an upper partition wall and a lower partition wall of the air duct 8, the air blown into the air duct 8 by the fan 9 cannot escape upward or downward, and therefore the main body extends vertically in the air duct 8. Forced to flow along. In this case, the forcibly guided air flow flows in contact with the entire length of the cooling fin 6 ′ of the heat sink 6, and particularly efficient heat discharge becomes possible. The dimensional design of the fan 9 and the shape and dimensions of the air duct must be selected as follows. That is, there is a gap between the heat sink 6 and the air duct 8 above or below the heat sink 6, from which air escapes and this air is not available for further cooling of the heat sink 6, and the ambient temperature is high. Even in such a case, one that can reliably cool the heat sink 6 and the light emitting diode 7 with reliability is selected.

  Since the curved road AFS module 5 and the air duct 8 including the fan 9 are fixed to a common support frame 17, both parts can be assigned accurately. The air duct 8 surrounds the heat sink 6 of the AFS module 5 for curved roads from three side surfaces with a space as small as possible. Since the heat sink 6 and the air duct 8 are not in contact with each other, the free mobility of the curved road AFS module 5 can be obtained. This module can be dynamically turned left and right about the vertical turning axis 14 while the vehicle is running. The heat sink 6 has cooling fins 6 ′ arranged perpendicular to the pivot shaft 14, and moves inside the U-shaped curved air duct 8 during the pivoting operation. The axis serving as the center of curvature of the air duct 8 is preferably congruent with the pivot shaft 14. Since the length of the air duct 8 is matched to the swivel angle of the heat sink 6 at both ends, sufficient flow and cooling of the heat sink 6 can be obtained at any length. The rear edge of the heat sink 6 and the back wall standing upright of the air duct 8 are formed so as to draw a radius around the turning axis 14 of the AFS module 5 for curved roads. Cooling air coming from the fan is blown to the heat sink 6 from behind and flows through the heat sink in both directions. The fan 9 can be arranged in any position, in which case the air duct 8 is adapted accordingly.

  FIG. 7 shows the mounting details of the inner support frame 16 around the pivot axis 14 in the outer support frame 17. Reference numeral 18 is given to two attachment points. In addition, FIG. 7 shows in an easy-to-understand manner how the primary optical system 15 that is a condensing optical system is arranged in front of the LED 7. Reference numeral 11 is attached to the air that the fan 9 feeds into the air duct 8.

  FIG. 9 a shows an AFS module 5 for curved roads, which comprises a main propagation device for the transmitted rays as parallel to the optical axis 19. The optical axis of the module 5 passes through a vertical pivot axis 14. FIG. 9 b shows that the AFS module 5 for curved roads is in a position turned by an angle α with respect to the optical axis. The main propagation device for the light beam emitted by the light module 5 extends through the intersection of the pivot axis 14 perpendicular to the optical axis 19.

  Another embodiment of a lighting device according to the present invention is described in FIGS. The light module 5 in this case is obtained by adding one or more light modules 5a in the form of a reflection module to the embodiment of FIGS. 6a to 9b. The reflection module includes a concave reflector 20 disposed on the light module 5. Cooling air for the two light modules, ie the light projection module 5 and the reflection module 5a, is here supplied by the fan 9 for all functions, and only one air supply to the individual modules 5, 5a. An air duct 8 is used. The air duct 8 is formed so that all the heat sinks 6 allow air to flow in accordance with the imposed requirements, thereby providing sufficient cooling for all the LEDs 7 throughout the light modules 5, 5a. FIGS. 10 a to 11 show the cooling of a combination of a dynamically movable AFS module 5 for curved roads and a fixed light module 5 a having a reflector 20. However, any other combination of the fixed light module and the movable light module is possible in the reflection technique or the light projection technique.

  12 to 18b show a third embodiment. In the case of this embodiment, the light module 5, the air duct 8, and the fan 9 are fixed to one common outer support frame 17. In this case, the light module 5 including the LED light source 7, the primary optical system 15, and the heat sink 6 is held by the outer support frame 17 so as to be rotatable around the vertical rotation axis 14 in the inner support frame 16. Has been. The air duct 8 and the fan 9 are fixedly attached to a strong support frame 17. The support frame 17 itself is disposed in the headlight housing 2 so as to be pivotable about a substantially horizontal axis via attachment points 17a and 17b. The heat sink 6 of the curved road AFS module 5 has a cooling fin 6 ′ extending in parallel with the pivot axis 14. As a result, air can flow through the cooling fin 6 'while freely blowing from the vertical direction. In forming the air duct 8, air is blown out toward the cooling fin 6 'from the narrow slit-shaped blowout port 8g under the heat sink 6 (see FIGS. 13 and 15), and the directed air flow Along the cooling fins 6 '. The cooling principle in this case is the same operation mode as in the case of the passive cooling method (free convection), but by using the fan 9 and blowing on the sheet sink 6 from the opening 8g in the air duct 8, Much more effective. Therefore, the heat sink 6 can be formed smaller than when only passive cooling is performed. By making the outlet 8g into a corresponding shape, the direction and amount of the cooling air that flows out can be adjusted with the aim of obtaining an optimum cooling action. Also in this embodiment, the cooling air starts from the fan 9 and is guided to the heat sink 6 through the air duct 8 in a targeted manner.

  Since the heat sink 6 and the air duct 8 are not in contact with each other, the curved road AFS module 5 can freely move with respect to the air duct 8 fixed to the housing 2. This module can dynamically turn an angle α in both the left and right directions around the vertical turning axis 14 during travel (see FIGS. 18a and 18b). Since the both ends of the air duct 8 are adjusted to the swivel angle α of the heat sink 6, sufficient flow and cooling can be obtained at any length. In addition, the light module 5 according to this embodiment can also be moved in the vertical direction (for example, low / high beam AFS: ALWR).

  Similar to that described in connection with the embodiment of FIGS. 10a to 11, the embodiment of FIGS. 12 to 18b also includes any number and combination of fixed and / or movable light modules. Things can be cooled by the fan 9 via the air duct 8. In the illustrated embodiment, another fixed light module 5 b is arranged beside the support frame 17. In the heat sink 6 of the other light module 5b, the cooling fins 6 'are cooled by the cooling air, and the cooling air flows out from the discharge opening next to the air duct. The heat sink 6 of the other light module 5 b is disposed immediately before the other outlet of the air duct 8. Since the other light module 5b and the air duct 8 are fixedly attached to the support frame 17, theoretically, the heat sink 6 and the air duct 8 may contact each other. It is also conceivable to arrange the heat sink 6 of this other light module 5b in the air duct 8.

  19 to 24 show another embodiment of the lighting device 1 according to the present invention. The illumination device 1 includes a so-called multi-chamber reflector 21. FIG. 19 is a view of the reflector as seen from behind, and FIG. 20 is a view as seen from the front. In the illustrated embodiment, the reflector 21 has three reflector chambers 22 arranged side by side. Each reflector chamber 22 is provided with one or more LED light sources 17. Each of the reflector chambers 22 has its LED disposed on one heat sink 6. Overall, this embodiment of the lighting device 1 according to the invention thus has three reflective type light modules 5c, 5d, 5e which are arranged and fixed side by side.

  In forming the air duct arranged in the reflection area on the back side, the cooling air is uniformly supplied to the heat sinks 6 of all the light modules 5c, 5d, and 5e by using the flanged fan 9. To form. FIG. 21 is a view of the air duct 8 as viewed from diagonally above, and FIG. By forming the heat sink 6 as a duct with fins 6 'inside, the mounting space is reduced and at the same time a forced flow and a very effective cooling of the LED 7 is obtained. Accordingly, in the illustrated embodiment, the heat sink 6 is an extension of the air duct 8 and is connected to the three discharge openings. The air duct 8 can be manufactured as an integral type or from a plurality of individual parts, depending on the manufacturing method. Depending on the shape of the air duct 8 and also with the use of air guide elements provided in the interior, even a single fan 9 can be used to obtain a uniform flow through all the heat sinks 6. When the headlight housing 2 requires a position adjusting device, the air duct 8 can also have a function of fixing a light module (for example, a reflector) as a supporting component to the position adjusting device depending on the shape of the air duct 8.

  A heat pipe (also referred to as “Waermehr”) and a thermosiphon (also referred to as “docktoses Waermehr”) are heat exchangers that obtain a high heat flow density by using the heat of vaporization and heat of condensation of the coolant. Compared to siphons, heat pipes have the advantage that heat can be expelled in any direction, unlike thermosyphons, coolant transport in heat pipes is not carried out by gravity; The capillary action of the inner wall of the pipe is used to guide it to the place to be cooled.

  The heat pipe is made of a hermetically sealed pipe, and the inner surface of the pipe is covered with a capillary (wick). This pipe is provided so that there is one heat transfer surface for each heat source and heat sink. The pipe is filled with a liquid that is easy to vaporize, and this liquid carries heat.

  When heat acts, the liquid begins to vaporize. This removes heat from the material to be cooled. The steam flows through the pipe to the heat sink (cooling zone), whereupon it again exhausts the heat of vaporization and condenses. The medium that has become liquid returns to the high-temperature zone in the capillary and is in a state where it can absorb heat again. The heat pipe by the action of the capillary works even under the condition of zero gravity and is used for the satellite. The heat pipe can also be used as a cooling device, and this cooling device can be used in any orientation in outer space.

  The Peltier element is an electronic unit based on the Peltier effect (according to Jean Peltier (1785-1845)). When a current is passed, a temperature difference is generated, or when there is a temperature difference, a current is generated. Another name is also called TEC (Thermoelectric Cooler).

It is a illuminating device by this invention, Comprising: It is a figure which shows the perspective view seen from diagonally forward. FIG. 4 shows another preferred embodiment of the heat sink and air duct of the lighting device according to the present invention. FIG. 4 shows another preferred embodiment of the heat sink and air duct of the lighting device according to the present invention. FIG. 5 shows yet another preferred embodiment of the heat sink and air duct of the lighting device according to the invention. FIG. 5 shows yet another preferred embodiment of the heat sink and air duct of the lighting device according to the invention. FIG. 5 shows yet another preferred embodiment of the heat sink and air duct of the lighting device according to the invention. FIG. 5 shows yet another preferred embodiment of the heat sink and air duct of the lighting device according to the invention. FIG. 5 shows yet another preferred embodiment of the heat sink and air duct of the lighting device according to the invention. FIG. 1 shows a first preferred embodiment of a light module of a lighting device according to the invention with a heat sink and an air duct, which can be adjusted relative to each other. FIG. 1 shows a first preferred embodiment of a light module of a lighting device according to the invention with a heat sink and an air duct, which can be adjusted relative to each other. FIG. 1 shows a first preferred embodiment of a light module of a lighting device according to the invention with a heat sink and an air duct, which can be adjusted relative to each other. FIG. 1 shows a first preferred embodiment of a light module of a lighting device according to the invention with a heat sink and an air duct, which can be adjusted relative to each other. 6a to 6d show a light module of the lighting device according to the present invention, part of which is a cross-sectional view. 6a to 6d show a light module of the lighting device according to the present invention, part of which is an exploded view. 6a to 6d show a light module of the lighting device according to the invention, part of which is shown in exploded view. FIG. 6 shows a light module of the lighting device according to the invention described in FIGS. 6 a to 6 d when the heat sink is in a swiveling motion with respect to the air duct, a part of which is shown in cross-section. FIG. 6 shows a light module of the lighting device according to the invention described in FIGS. 6 a to 6 d when the heat sink is in a swiveling motion with respect to the air duct, a part of which is shown in cross-section. FIG. 1 shows a first preferred embodiment of a light module of a lighting device according to the invention with a heat sink and an air duct, which can be adjusted relative to each other. FIG. 1 shows a first preferred embodiment of a light module of a lighting device according to the invention with a heat sink and an air duct, which can be adjusted relative to each other. FIG. 1 shows a first preferred embodiment of a light module of a lighting device according to the invention with a heat sink and an air duct, which can be adjusted relative to each other. FIG. 1 shows a first preferred embodiment of a light module of a lighting device according to the invention with a heat sink and an air duct, which can be adjusted relative to each other. 10a to 10d show a light module of the lighting device according to the present invention described in FIG. FIG. 6 is a diagram showing a third preferred embodiment of a light module of a lighting device according to the present invention having a heat sink and an air duct that are relatively position adjustable, and is a perspective view seen from obliquely above. Show. It is the figure which looked at the light module of the illuminating device by this invention described in FIG. 12 from the top. It is a figure which shows the air duct of the light module of the illuminating device described in FIG. 12, Comprising: The one part is shown with sectional drawing. It is a figure which shows the air duct of the light module of the illuminating device described in FIG. 12, Comprising: The one part is shown with sectional drawing. It is a figure which shows the light module of the illuminating device described in FIG. 12, Comprising: The one part is shown with an exploded view. It is a figure which shows the air duct of the illuminating device by this invention described in FIG. 12, Comprising: The one part is shown with sectional drawing. FIG. 13 shows a light module of the lighting device according to the invention described in FIG. 12, as seen from above, with the light module in various swiveling positions. FIG. 13 shows the light module of the lighting device according to the invention described in FIG. 12, as seen from above, with the light module in various swiveling positions. FIG. 6 is a perspective view of another preferred embodiment of the lighting device according to the present invention, which has a plurality of light modules and heat sinks arranged side by side, as viewed from the rear (note that this figure shows the air duct). Omitted). It is the perspective view which looked at the embodiment described in FIG. 19 of the illuminating device by this invention from diagonally forward. It is the figure which added the air duct to the embodiment described in FIG. 19 of the illuminating device by this invention, and was seen from diagonally upward. It is the figure which looked at the embodiment described in FIG. 21 of the illuminating device by this invention from diagonally downward. It is embodiment shown in FIG. 21 and FIG. 22 of the illuminating device by this invention, Comprising: It is a horizontal sectional view of the heat sink and a part of air duct. FIG. 23 is a longitudinal sectional view of the embodiment described in FIGS. 21 and 22 of a lighting device according to the present invention.

Claims (22)

A lighting device (1) comprising at least one semiconductor light source (7) connected to a heat sink (6) for heat dissipation,
The lighting device (1) comprises an air duct (8) and means (9) for actively sending air through the air duct (8), the air duct being positioned substantially horizontally and vertically Of the air flow (11, 11a, 11b, 12, 12a, 12b) in which at least a portion of the heat sink (6) is carried through the air duct (8). The lighting device (1), characterized in that it is arranged inside.   Lighting device (1) according to claim 1, characterized in that said means (9) for actively sending air comprises a fan.   The lighting device (1) according to claim 1 or 2, characterized in that the heat sink (6) comprises a receptacle for mounting the semiconductor light source (7).   The heat sink (6) is a receiver for mounting the reflector of the lighting device (1), a receiver for mounting the lens of the lighting device (1), and / or a receiver for mounting the shade of the lighting device (1). The illuminating device (1) according to any one of claims 1 to 3, characterized by comprising a tool.   The heat sink (6) comprises a light module (5) that operates according to the principle of projection and a receiver for mounting components of the light module (5a) that operates according to the principle of reflection. The illuminating device (1) as described in any one of 4.   The lighting device (1) according to any one of claims 1 to 5, characterized in that the lighting device (1) comprises a plurality of semiconductor light sources (7).   Lighting device (1) according to any one of the preceding claims, characterized in that at least a part of the heat sink (6) is arranged in an air duct (8).   The illuminating device (1) comprises a housing (2), which has a light exit opening that is directed in the light exit direction and is closed by a cover glass (4), at which time the air flow is applied to the cover glass ( 4) An air duct (8) is arranged in the housing (2) so as to flow in contact along the inside of the air flow (12, 12a, 12b) in contact with the heat sink (6). The lighting device (1) according to any one of claims 1 to 7, characterized in that it is oriented.   The illuminating device (1) comprises a housing (2), which has a light exit opening that is directed in the light exit direction and closed by a cover glass (4), and an air flow is in the housing (2) An air duct (8) is arranged in the housing (2) and flows in contact with the heat sink (6) so that it flows in contact with the other energy consuming devices arranged. , 12b) are oriented, the lighting device (1) according to any one of the preceding claims.   At least one heat pipe, at least one thermosiphon, and / or at least one Peltier element is arranged behind the heat sink (6) as viewed in the direction of air flow (12, 12a, 12b). Lighting device (1) according to any one of the preceding claims, characterized in that   The air duct (8) has a vertically extending body, openings (8a, 8b) are provided at both ends of the air duct (8), and means (9) for sending air through the air duct (8) is provided. Illumination device (1) according to any one of the preceding claims, characterized in that it is arranged at one of the ends of the air duct (8).   The air duct (8) has a main body extending vertically, and openings (8a, 8b) are provided at both ends of the air duct (8). 11. Opening according to claim 1, characterized in that an opening (8c) is formed and means (9) for sending air through the air duct (8) are arranged in front of the opening. The illuminating device (1) as described in any one.   The sheet sink (6) is curved about a substantially vertical axis (14), and the air duct (8) is shaped like a curve of a heat sink (6). Item 13. An illumination device (1) according to item 11 or 12.   The air duct (8) is formed in a cruciform shape, and has a first partial duct extending substantially horizontally and another partial duct extending substantially perpendicularly intersecting the air duct (8). ) With openings at all four ends, another opening is formed at the cross-shaped intersection, and means (9) for sending air through the air duct (8) before the other opening The lighting device (1) according to any one of claims 1 to 10, characterized in that is arranged.   The heat sink (6) is provided with a cooling fin (6 ′), which passes through an opening provided in at least one partition wall of the air duct (8) and passes through the air duct (8). 15. Illumination device (1) according to any one of the preceding claims, characterized in that it projects inside.   The longitudinally extending body of the cooling fin (6 ′) extends substantially parallel to the longitudinally extending body of the air duct (8), and the cooling fin (6 ′) has a transverse cross section inside the air duct (8). 16. Illumination device (1) according to claim 15, characterized in that it is provided obliquely when viewed.   Lighting device (1) according to any one of the preceding claims, characterized in that the heat sink (6) is arranged in front of a slit-shaped outlet (8g) of the air duct (8). ).   The air duct (8) is disposed in a fixed location in the housing (2) of the lighting device (1), and the heat sink (6) is a part of the light module (5) of the lighting device (1). 14. The lighting device (1) according to claim 13, characterized in that it can be swiveled with respect to the housing (2) and the heat sink (6) about a substantially vertical swivel axis (14).   19. Lighting device (1) according to claim 18, characterized in that the vertical axis (14), which is the center of curvature of the heat sink (6), coincides with the pivot axis (14) of the light module (5). ).   The cross section of the air duct (8) is substantially U-shaped, and at least a part of the heat sink (6) is arranged in front of the open side of the U-shaped air duct (8), the open side being the surrounding The lighting device (1) according to any one of the preceding claims, characterized in that is sufficiently closed.   The lighting device (1) includes a plurality of light modules (5, 5a, 5b) and a plurality of heat sinks (6), and the air carried by the air duct is used for various light modules (5, 5a, 5b). 21. Illumination device (1) according to any one of the preceding claims, characterized in that an air duct (8) is formed to be used for cooling a plurality of heat sinks (6).   19. Lighting device (1) according to claim 17 and 18, characterized in that the heat sink (6) comprises cooling fins (6 ') extending parallel to the substantially vertical pivot axis (14) of the light module (5). 1).

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