EP2233832A1 - Assembly for emitting light with light elements - Google Patents

Abstract

The arrangement (10) has a lamella cooling body (6) coupled with light elements i.e. LED-units (12, 14). The cooling body is arranged such that the cooling body vibrates completely or partially or sectionally a cooling lamella (8). The cooling body is designed in a cylindrical shape and comprises radial circular cooling rims. The cooling body is mechanically coupled with a drive element or a vibrator producer i.e. piezo element and plunger coil. The cooling body and the light elements are connected with each other via a layer made of vulcanizing rubber or silicone.

Description

The present invention relates to an arrangement for emitting light with luminous elements, in particular LEDs, and a thermally coupled to the luminous elements heat sink.

The operation of an LED luminaire, in which relatively high luminous fluxes are to be achieved, requires that a significant amount of heat is dissipated effectively.

The thermal resistance between barrier layers of the individual LEDs, for example, combined as an LED unit, and ambient air can be significantly reduced by a heat sink, which further corresponds to a cooling medium.

In principle, the LED unit, for example a carrier or a printed circuit board with an LED arrangement, is mounted on a cooling plate or on a heat sink and thermally connected, so that the thermal resistance between the barrier layer and the surrounding air decreases.

In order to favor the heat transfer between the LED unit and the heat sink, it is customary to make the contact surface flat.

Functionally, the heat sink, like a transmission element, part of a transmission path, quickly dissipates the heat loss generated by heat conduction from the heat-generating component as a source to a sink, and then releases the heat loss to the environment through exchange processes such as heat radiation and convection.

The behavior of the heat sink or the heat transfer from a heat source to the surrounding cooling medium, preferably air (possibly also water or other Liquids such as oils) depends primarily on the temperature difference, the effective surface and the flow velocity of the cooling medium.

According to the state of the art, monolithically integrated semiconductor circuits, for example block or hybrid amplifiers, as far as comparable to an LED unit, are thermally coupled to a solid heat sink for heat dissipation.

In this respect, a slightly better thermal coupling or impedance adaptation to the exterior space for heat removal seems possible in the aforementioned approach. Nevertheless, it is found in practical operation that with conventional approaches a certain lagging behind the actual cooling performance behind the required cooling capacity occurs. Corresponding oversizing of the heat sink is required. There are also gradients in the heat transfer, or is there a kind of stationary insulation layer, so that the heat loss is dissipated only in part and also locally different.

The US 6,863,421 shows a lamp housing for an image projector lamp, in the small space an air flow is generated with a fan. Inside the chamber, in which the burner of the lamp is located, a plurality of ribs on the inside of the chamber is arranged. The fins are used for shaping the flow and improving the air mixture with the ambient air, which is blown into the interior of the lamp via a fan. To counteract a significant noise, the flow rate should be low.

It would therefore be desirable to improve the heat sink so that a heat release while avoiding the above-mentioned disadvantages is possible.

The present invention has for its object to provide a heat sink with improved properties for improved heat transfer, so that LED lights can be made low with a large radiant power.

The object is achieved by an arrangement for emitting light with luminous elements according to claim 1 and by a cooling device for use in an arrangement for emitting light with luminous elements according to claim 9. Advantageous developments are the subject of the dependent claims.

Accordingly, according to a first aspect, an arrangement for emitting light is provided with luminous elements, in particular LEDs, and a thermally coupled to the luminous elements heat sink, characterized in that the heat sink is designed such that it completely or at least a part or a portion of its surface vibrates , The heat sink may consist of a solid part, which is at rest, or firmly connected to a housing part such as the lamp housing or a support structure, and a part, such as. Louvers or cooling ends leaking from a solid base that vibrate. In the foregoing, the image may be taken from vibrating or fan-out tongues that release heat output to the environment and generate their own flow or turbulence. By swinging the heat sink ends of the heat sink, a moving or dynamic heat sink is created. Furthermore, it is possible to generate a moving or turbulent flow on the walls or cooling surfaces. The above greatly increases the performance of the cooling device. The heat sink is improved in the heat conduction and its transport properties. Thermal resistance and heat capacity of the moving heat sink are much lower than compared to a normal heat sink of the same type in which there are laminar flows. According to the first aspect of the invention is remarkably dissipated by the LED unit, possibly very high power dissipation dissipates much faster, or, as would be a heat sink, which would actually be orders of magnitude larger and more massive than the one used to very high To cope with heat loads.

According to a second aspect, the above arrangement for emitting light is characterized in that the cooling body is cylindrical and has radially encircling cooling fins. However, the aforementioned cooling fins can also be milling a solid cylinder, for example, an array of parallel milling. Further, the millings may run longitudinally or transversely of an elongated cylinder to yield a pattern or raster. The protruding ends may be square or round.

According to a third aspect, the arrangement for emitting light according to the first or the second aspect is characterized in that the shape or the design of the heat sink promotes the emergence of a turbulent air flow. Above, a change in the properties of the heat sink can be provided by a profiling. The profile may be rough, corrugated or wavy, scaled or roof-plate patterned, have bumps or irregularities in the course.

According to a fourth aspect, the arrangement for emitting light according to the first to third aspects is characterized in that the heat sink has cooling slats, corrugations, millings, polished or rough prisms.

According to a fifth aspect, the arrangement for emitting light according to the first to fourth aspect is characterized in that the heat sink is mechanically coupled to at least one drive element or a vibration generator such as a piezoelectric element, a voice or plunger coil. The mechanical coupling can be done for example by screwing the vibration generator to the heat sink. For vibration, a drive is used. Also, a small electric motor can be used as a vibration motor.

According to a sixth aspect, the arrangement for emitting light according to the fifth aspect is characterized in that a time-varying voltage is applied to the vibration generator. A time-varying voltage may be understood as a waveform of a signal having an amplitude and a frequency and a start or reference phase.

According to a seventh aspect, the light emitting device according to one of the preceding aspects is characterized in that the heat sink comprises two oscillators. The vibration generators are arranged at different locations of the heat sink. The vibration generators are driven with different voltage curves. Over at least a portion of the heat sink can form interference that promotes a turbulent flow, a vortex or a vortex formation.

According to an eighth aspect, the light emitting device according to any one of the preceding aspects is characterized in that the lighting elements are mounted on the heat sink. The heat sink and the light elements or a support for the light-emitting elements are connected via a conductive or insulating, vibration-elastic or vibration damping medium, such as a layer of vulcanized rubber. In addition to a rubber or rubber, it is also possible to use elastic, heat-resistant and aging-resistant plastics of another type, in addition to silicones.

According to a ninth aspect, there is provided an LED emitter for use for emitting light with a heat sink thermally coupled to luminous elements. The LED radiator is characterized in that it vibrates completely or at least part or a portion of its surface.

According to a tenth aspect, the LED emitter for use in light emission according to the above aspect is provided, and is characterized in that the heat sink according to any one of the second to fifth aspects is performed.

According to an eleventh aspect, the LED radiator according to the ninth or tenth aspect is characterized in that the heat sink having at least one drive element or a vibration generator according to the sixth and the seventh aspect.

According to a twelfth aspect, the LED radiator according to one of the ninth to eleventh aspects is characterized in that the lighting elements are mounted on the heat sink. The heat sink and the lighting elements or a support for the lighting elements are connected via at least one intermediate layer according to the eighth aspect. In the aforementioned intermediate layer, a conductive layer, a film or a layer arrangement of plastics may be provided, wherein at least one conductive plastic is contained. Conductivity in the above refers to electric current and / or thermal heat conductivity. The aforementioned layer can also form a thermocouple, which in addition to the function for the heat transfer and for measuring an electrical or thermal resistance can be used. The thermocouple may be in the above case, a sensor and / or a part of a control loop in the sense of the aforementioned aspects.

According to a thirteenth aspect, the LED radiator according to one of the ninth to twelfth aspects is characterized in that at least one heat sink coupled to at least one luminous element is present. In an LED arrangement for emitting light with luminous elements, a plurality of small heat sinks according to one of the above aspects can be combined in an arrangement of spaced apart individual systems, for example a matrix.

According to a fourteenth aspect, the LED radiator according to the thirteenth aspect is characterized in that the at least one heat sink completely or at least a part or a portion of the surface of a heat sink vibrates in alternation.

By vibration as mentioned above, it is meant, in general, vibrations and waves containing mechanical vibrations and waves, besides dynamically changing characteristics of a physical quantity, such as a spring force. As an example, oscillating rod with one-sided storage is called. Vibrating may include a portion or parts of an electromagnetic spectrum over a low frequency, for example, in the range of 0 to 100 hertz, a frequency in the audio range of 20 hertz to 20 kilohertz, KHz, or a frequency in the range of 20 to 100 KHz. The orientation and direction of the vibration may be longitudinal, transverse or circular depending on the excitation of the heat sink according to any one of the fifth to seventh aspects related to driving the heat sink.

According to a fifteenth aspect of the LED radiator according to one of the ninth to fourteenth aspects, a reflector is provided, which is characterized in that the reflector has a shape that favors the heat sink when creating a turbulent or vortex-shaped air flow.

In the LED array of the present invention, according to the embodiments, for the heat sink, it is provided either as the heat sink circumferentially ribbed metal block, preferably made of extruded aluminum, as solid metal mold, as circumferentially corrugated metal plate, as a solid core with pressed-in, introduced via a press fit, or soldered slats or milled from solid material to manufacture. In addition, the heat sink can also be designed as a stamped, shaped or folded laminated core, or as attachable cooling star, cooling ring and cooling vanes. Further, in plan view of the heat sink, a screened pattern may be present as a screened array having a depth (length of the cooling fins or cubes viewed from the base). A rasterized pattern is for example a diamond-shaped milled into a solid blank training on cooling fins or Kühlrauuten.

In order to keep the thermal resistance as low as possible, the heat sink should preferably consist of good heat-conducting material and preferably have a dark and very large surface area. Next, the heat sink should be mounted vertically in order to exploit the chimney effect in the air circulation can.

Starting from a massive base plate, the LED unit is to be mounted, for example, in the middle, and should then radiate from the center point-like outward in the direction of the circumference. Furthermore, resting air of the environment should be present without additional heat radiation.

At the bottom or on the circumference of the heat sink, a vibration drive is to be mounted, for example, a piezoelectric element which vibrates or the heat sink. The heat sink moves. The individual fins, or cooling ends perform oscillatory movements. The movement of a lamella or a wall can take place either around its clamping or connection to the solid base, for example swinging back and forth, but also slightly distorted to be twisted or twisted about an axis along the clamping. In the case of a circulating cooling coil, the arrangement itself can also vibrate.

The type of vibration (waveform) and the spatial formation on the surface of the lamella or on the heat sink, for example, a running along waves over a grid arrangement, should be determined by the geometry and shape of the lamella. By the drive can certain Vibration patterns are also selectively excited. The drive, in the case of an electric piezoelectric element or an electromagnetic coil, or a vibration motor, by a corresponding waveform (voltage, current, reference phase angle, waveform, wave (transverse, longitudinal), spectral components) via a feed, preferably a cable or a coaxial line, which causes a corresponding vibration behavior in conjunction with the geometry of the slats.

By the vibration of the heat sink, the formation of a laminar boundary layer or prevented. It creates turbulent currents. The cooling capacity is increased. The size of the heat sink can be reduced. A reduction in cooling over the operating period is eliminated.

In the meantime, the LED arrangement for emitting light with luminous elements is and will remain maintenance-free for a long time, protected against premature aging and sudden breakdown.

Fig. 1

eine Seitenansicht der LED-Anordnung mit einem Lamellen- Kühlkörper gemäß einem ersten Ausführungsbeispiel der vorliegenden Erfindung;

Fig. 1a

eine Schrägansicht der LED-Anordnung gemäß dem ersten Ausführungsbeispiel der vorliegenden Erfindung mit länglichen Lamellen;

Fig. 2a

eine Draufsicht einer Ausgestaltung eines Kühlkörpers mit einem radial umlaufenden Kühlkranz und einer integriertem LED-Einheit gemäß einem zweiten Ausführungsbeispiel der vorliegenden Erfindung;

Fig. 2b

eine Draufsicht einer Ausgestaltung eines Kühlkörpers mit radial strahlförmig auslaufenden Spitzen mit Innen-Ausnehmung und einer integriertem LED-Einheit gemäß einem dritten Ausführungsbeispiel der vorliegenden Erfindung;

Fig. 2c

eine Draufsicht einer Ausgestaltung eines Kühlkörpers mit einem radial strahlförmig auslaufenden massiven Kühlkörper gemäß einem vierten Ausführungsbeispiel der vorliegenden Erfindung; und

Fig. 2d

eine Draufsicht einer Ausgestaltung eines Kühlkörpers mit einem massiven Kühlkörper mit umlaufend gewelltem Profil gemäß einem fünften Ausführungsbeispiel der vorliegenden Erfindung.

The invention will be explained in more detail with reference to the accompanying drawings. Show it:

Fig. 1

a side view of the LED array with a fin heat sink according to a first embodiment of the present invention;

Fig. 1a

an oblique view of the LED array according to the first embodiment of the present invention with elongated slats;

Fig. 2a

a plan view of an embodiment of a heat sink with a radially encircling cooling ring and an integrated LED unit according to a second embodiment of the present invention;

Fig. 2b

a plan view of an embodiment of a heat sink with radial jet-shaped tips terminating with inner recess and an integrated LED unit according to a third embodiment of the present invention;

Fig. 2c

a plan view of an embodiment of a heat sink with a radial jet expiring massive heat sink according to a fourth embodiment of the present invention; and

Fig. 2d

a plan view of an embodiment of a heat sink with a massive heat sink with circumferentially wavy profile according to a fifth embodiment of the present invention.

In Fig. 1 an LED array 10 according to the first embodiment is shown from the front side. First, the luminaire housing 2 is shown by two concave inwardly curved side parts in sections and with a view into the interior of the LED assembly 10 cut free. In the present case, the aforementioned side parts can therefore be radially encircling and form a half shell or hemisphere. In the case of an elongated LED light you can Fig. 1 , alternatively interpreted, even beyond the drawing plane imagine linearly extended, so that the side parts then represent a right and a left part of an elongated profile.

Next is, connected to the luminaire housing 2 and to the conclusion of the LED arrangement with respect to the outer space, a light exit element 4 is provided. In a manner known per se, in the simplest case, the light exit element can be a transparent or slightly metal-coated glass plate in conjunction with a grid or a raster reflector. The light exit element can be detachably connected to the luminaire housing 2.

At the top of the luminaire housing 2, the heat sink 6 connects. The connection of the heat sink to the lamp housing can be elastically by an (outside the drawing standing) intermediate layer of an elastic material, which also seals.

The heat sink 6 has here, purely by way of example, a regular structure of cooling fins 8.

The LED unit 12 is suitably mechanically, thermally, possibly also electrically connected to the heat sink. For example, an LED 14 is shown on the LED unit, it being understood that the LED unit 12 also has a larger area of the heat sink 6 and can lead multiple LEDs in a matrix arrangement.

In operation, the cooling fins 8 serve to cool the LED unit 12, that is to say for the dissipation of the loss heat incurred during the light generation. The heat loss is passed from the inside of the LED unit on the heat sink and at the ends, for example, shown as vertical lines in the heat sink 6, transported to the outside and discharged into the exterior.

The heat sink 6 can be set in vibration by a drive (lying outside the drawing). In operation, the formation of a laminar boundary or insulating layer remains. Rather, turbulences, eddies and a higher air velocity occur due to the vibration of the heat sink surface or at the ends of the heat sink. The mixing of the ambient air is improved. The heat dissipation becomes noticeably more effective.

In addition, the dusting of the heat sink fins is also prevented, overtemperatures with retroactive effect on the LED element are avoided. The driven lamellae move and are sufficiently ventilated or swirled around.

Fig. 1a shows the LED arrangement Fig. 1 in an oblique view, wherein a radially encircling shape of the lamp housing 2 was based on the LED arrangement.

For example, however, symmetrically distributed over the circumference sections may be formed as a kind of side window 3 of a transparent plastic, if a light exit to the side is desired. The one or more side windows can like the light exit element 4 in Fig. 1 It may be desirable to provide a roughened surface for a diffuser for uniform light distribution.

Incidentally, for a visually appealing and handy shape, for example, in addition to a spherical radius, an egg, elliptical or parabolic design of the lamp housing can be selected.

The cooling fins 8 of the heat sink 6 are in Fig. 1a elongated parallel spaced and have a certain thickness. The thickness can preferably be chosen so that the blade is capable of vibration.
On the right, part of a single lamella 8a is shown, in order to indicate by a raster that the surface of the lamella can have a profile 7.

In particular, the protruding surface may be rough, corrugated or shingled or roof-plate-shaped, it may have a height or depth profile or unevenness along the lamella.

The aforesaid allows to reduce laminar flows at the fin and to promote formation of turbulence. The drive of the heat sink can also be supported. Conversely, the above can be taken into account in the type of driving of the drive in terms of amplitude, frequency and waveform.

In Fig. 2a is a view from above of the heat sink 20 a shown. The heat sink 20a can be out as a heat sink 6 Fig. 1 Insert with the luminaire housing 2.

In the present case, a circulating cooling ring 22 was used, which can also be designed as a so-called. Heatpipe. The vertical lines in Fig. 1 correspond to the outwardly facing rounded corners of the cooling ring.

The cooling ring can be milled or cast from solid material. The cooling ring is arranged on a bottom plate 24 and a solid base plate. The outer border 23 can serve as a borderline for the dimension of the base plate.

However, in particular in the case of the heat pipe, lamellae may also be connected to a ring-shaped circumferential tube as ring radiator which is in connection with a bottom plate 24 of the heat sink 20a, with a coolant circulating. In the bottom plate then inside extending recesses or cooling coils are provided.

In the middle of Fig. 2a is, purely by way of example as a heat source, in turn, the LED unit 12 and the LED 14 located.

The cooling ring corresponds to Fig. 2a a revolving closed shaft or spiraling. The cooling ring, in the present case designed with 20 regular and rounded turns or periods of the course of the wall, can also have a different number of walls or a different wavelength. The waveform of the circuit can be changed. For example, instead of the curves 26, rectangular or trapezoidal walls or lamella walls may also be possible.

In addition, individual walls may be missing or surfaces may be flat, ie. there are missing sections in the rotating shaft.

In addition, a rotating spring can be used as a cooling ring. Furthermore, the spring can run around the circumference several times, as in the case of winding a coil, and can be helically tapered upwards or formed as a coiled helix.

Furthermore, the principle of the heat pipe can be combined with a flat coil. A tube is wound in a coil shape from inside to outside. Inside the flat coil circulates coolant, which is thermally conductive, electrically conductive, or insulating or magnetic. At the flat coil is an AC voltage. Since it can be achieved by suitable control that flat coils are colder inside than outside, anyway, a temperature difference form the center from the center to form the circumference, you can apply the principle of the counterflow cooler advantageous by bringing the output of the cooling coils of the massive heat sink to the center of the base and connects to the entrance of the coil-shaped tube.

Finally, it is also possible to use a closed wheel curve running over the circumference of a geometry as a so-called ordinary cycloid, similar to the two-way-rectified variant of the aforementioned closed shaft as so-called stretched cycloids. The scope of the geometry may be a conic, like a circle, but also a polygon. If a circumferential thin tube is provided, this can be coiled as so-called. Entwined cycloids.

In the Fig. 2b a heat sink 20b is shown in which the star-shaped starting from a center (originally star-shaped) profile was rotated in the plane of the drawing. A kind of right rotation is formed at tangentially outwardly extending heat sink ends 28 as the outer ends of the cooling fins 8b. At the heat sink ends 28 may have a cylindrical or polygonal bulge, Umkragung or orbiting with a radius 28a to avoid sharp edges. The radius 28a is shown in the drawing at two adjacent peaks representative of the other ends. The continuation is indicated by three points "...", as far as all peaks receive a radius 28a; The slats can also be shortened or compressed. The radius 28a at the fin end, the thermal coupling can be optimized to the outside space at the top of the cooling fin and improve the radiation behavior and the large-signal characteristics of the heat sink. In addition, the mechanical vibration behavior can be optimized.

The heat sink 20b is thermally connected to a (not shown) bottom plate 30 cohesively, positively or releasably connected. Inside the heat sink, a circular recess is provided, which preferably has holes, for example, for attachment to the LED unit 12 with LED 14 and to carry out the supply cable and control lines.

The here purely exemplary pointed corners can, as in Fig. 2a executed, in turn rounded by radii.

Fig. 2c shows a further massive heat sink 20c in plan view with a star-shaped or sun-ray-like profile as so-called. Sun-shape heat sink or sunray heat sink. Sun shape here means that a solid cylindrical core is present in the center with a circular circumference here. From the origin or middle spring a variety of so-called. Sun rays or sunshine roads.

Both the number of beams mentioned above, the circumference of the solid core, and the ratio between the beam length and core circumference can be chosen for the largest possible surface for the heat exchange. It goes without saying that one or more beams can be dispensed with on one side, for example for the supply of a supply line for the LED element, if this is preferred for constructional reasons. The LED element (not shown) can be thermally connected to the bottom of the heat sink.

As in Fig. 2b especially clear and at Fig. 1 indicated as an example was chosen so that the ends of the heat sink all the same length protrude from a center. In the present case, a triangular cross-section was chosen, which tapers to the outside. The above is missing, however, when a cylinder blank, only perpendicular to the circumference in the direction of the center along and / or transversely milled or rasterized. In both aforementioned cases, the surfaces in the direction of rotation (cutting surfaces) may also have a corrugated profile or a surface structure.

The above profile allows the following advantage: If the heat sink is excited at a plurality of substantially similar ends 28c in the vicinity of the natural or resonant frequency, which also naturally only a small amount of energy must be expended, the drive can be designed accordingly simple, arises from the multiple resonances, time delays and reflections of the vibrating ends among each other a kind of Hall with a noise component.

In the present case, the above-mentioned noise component is again advantageous for improving the cooling properties. The formation of turbulence is enhanced by the oscillating or rushing heat sink fins. The result is a synergistic effect. The improved turbulence of the cooling air improves the cooling of the LED element. The form or beam shape of the ends 28c can be used to influence the type of noise, reverberation times and the spectral density distribution of the resonances or the clinking of the heat sink, so as to favor a uniform noise of the heat sink.

To achieve excitation in the vicinity of the resonance, a simple control circuit with a voltage-controlled oscillator can serve, which can oscillate in the range of the expected resonance frequencies. As supplied from a sensor control voltage is the amplitude of the vibration of the heat sink.

As long as the amplitude is outside its maximum or a setpoint, the circuit increases the control voltage slowly, ie. the oscillator frequency increases. The increase in the oscillator frequency continues until the control voltage drops again. The amplitude of the natural oscillation decreases after exceeding the resonance point again. By the above method, the resonance range of the heat sink can be passed. The proximity of the resonant frequency is thus reached when the control voltage tends to its maximum, so the changes are always larger and almost a balance between control voltage and oscillator frequency would set. For safety reasons, the optimum excitation frequency is preferably chosen slightly in addition to the resonant frequency of the heat sink, alternatively in the case of a harmonic. Also, housing resonances of the LED array should be considered. For small excitation amplitudes, it is also possible to tune to the resonant fundamental frequency of the heat sink.

By a suitable choice of excitation frequency and amplitude is preferred that the heat sink sufficiently vibrates, so that the formation of laminar flows is omitted, but still no significant noise emanates from the LED array.

Fig. 2c and Fig. 2b can be combined. At the bottom of the profiling is Fig. 2c set and running upward is a rotation about a common center axis of the slats before on the basis of Fig. 2b , but contrary to both drawings the same number of radii are used.

Now the profiles of Fig. 2c rotated in the above against each other by a certain angle, the individual lamellae 8b Fig. 2b instead of the vertical course in the plane of the drawing in an oblique or inclined, ie. twisted vertically to the plane of the drawing, be arranged. In addition, a conical or spherical arrangement of the heat sink can be provided (not shown), decreases in the outer diameter to the top. In the above, the bottom diameter is based on the profile Fig. 2c less than the diameter of the profile Fig. 2b ,

As a result, as a result, the heat sink actually corresponds to a massive stationary fan wheel which has oscillating ends. The air flowing past the heatsink itself generates eddies and possibly even a little cold. Thus, it is also possible by the shape of the heat sink, at least partially, to avoid laminar flows on the surfaces of the fins, or to promote or predict the formation of turbulence. Now, if the heat sink is set in vibration, for example, if tuned to resonances, so that the ends have noticeable or a visible oscillation amplitude, then the use of a fan as an additional component can be omitted as well as the problem of air mixing. The heat sink generates its own flow. It can be provided larger cooling capacities.

Fig. 2d shows a further massive heat sink 20d with wavy circumferential profile as a modification of Fig. 2a , The cooling fins are compared to Fig. 2b run very short and bring rather minimal surface enlargement, but at maximum bulkiness of the heat sink. The above should show in comparison to the preceding figures, the possibilities of variation essential, the function determining parameter of the heat sink, in particular heat capacity, thermal resistance and flow velocity at the surfaces.

The outer border, dashed lines, serves as an orientation aid for the circumference of the base plate.

In addition, other roll curves (cycloids, epicycloids, hypocycloids) may be mentioned as geometry shapes for a heat sink, in which circles of different diameters roll onto or into one another, in particular a rose curve, a clover leaf or a toothed wheel.

Again, the LED element (unillustrated) at the bottom (or below the plane of the drawing according to FIG Fig. 1 ) are thermally connected to the heat sink. It is understood that instead of the star-shaped or toothed configurations, polygons can also be used.

Furthermore, the shape allows the example of Fig. 2a a maximum rate of airflow circulation so that the maximum heat can be dissipated from the LED unit. In addition, the above is achieved without additional energy, so that the cooling efficiency is very high.

The present invention thus provides a simple, elegant and effective way to promote a well-tempered area of an LED array, in particular a luminaire with individual LED luminous elements of an LED luminaire.

The cooling by the vibrating heat sink with assistive shaping is active and allows the benefits and superiority that an LED array according to the present invention offers in terms of economy, lifetime, freedom from maintenance, and reliability to be exploited and to benefit the user.

In addition, the cooling by the vibration heat sink is also so good of the cooling efficiency by utilizing selectively by the drive, supportive or by the heat sink vorbildbaren turbulence that LED units can be operated even at high ambient temperatures and maximum power at optimum temperatures.

Claims (15)

Arrangement for emitting light (10) with luminous elements (12; 14), in particular LEDs, and a heat sink (6) thermally coupled to the luminous elements,
characterized,
in that the heat sink (6) is designed in such a way that it vibrates completely or at least part or a portion of its surface (8). Arrangement for emitting light (10) according to claim 1,
characterized,
that the cooling body (6) is cylindrical and radially circumferential cooling ribs (22). Arrangement for emitting light (10) according to claim 1 or 2,
characterized,
that the shape and / or the design of the heat sink (6) favors the development of a turbulent air flow. Arrangement for emitting light according to one of claims 1 to 3,
characterized,
that the cooling body (6) cooling slats (8), corrugations, grooves, polished or rough comprises prisms. Arrangement for emitting light (10) according to one of claims 1 to 4,
characterized,
that the cooling body (6) is mechanically coupled to at least one drive element or a vibrator such as a piezoelectric element, a voice or moving coil. Arrangement for emitting light (10) according to claim 5,
characterized,
in that a time-variable voltage is applied to the vibration generator. Arrangement for emitting light (10) according to one of the preceding claims,
characterized,
in that the heat sink (6) has two vibration generators which are arranged at different locations of the heat sink (6) and are driven with different voltage profiles, such that interference forms over at least part of the heat sink (8), which is a turbulent flow Vortex or vortex formation favor. Arrangement for emitting light (10) according to one of the preceding claims,
characterized,
in that the luminous elements (12, 14) are mounted on the cooling body (6), wherein the cooling body (6) and the luminous elements or a carrier for the luminous elements (12, 14) via a conductive or insulating, vibration elastic or vibration damping medium, such as a layer of vulcanized rubber are connected. LED radiator (10) for use for emitting light with a heat sink with heat elements (12, 14) coupled to the heat sink (6),
characterized,
that it vibrates completely or at least part or a portion of its surface (8). LED emitter (10) for use for emitting light according to claim 9,
characterized,
in that the heat sink (6) is designed according to one of Claims 2 to 5. LED radiator (10) according to claim 9 or 10,
characterized,
in that the heat sink (6) comprises at least one drive element or a vibration generator according to claims 6 and 7. LED radiator (10) according to one of claims 9 to 11,
characterized,
in that the luminous elements are mounted on the cooling body (6), wherein the cooling body and the luminous elements or a support for the luminous elements (14) are connected via at least one intermediate layer according to claim 8. LED radiator (10) according to one of claims 9 to 12,
characterized,
in that at least one heat sink (6) thermally coupled to at least one luminous element (12) is present. LED radiator (10) according to claim 13,
characterized,
that the at least one heat sink completely or at least a part or a portion of the surface of a heat sink (6) vibrates in alternation. LED radiator (10) according to one of claims 9 to 14, in which a reflector is provided,
characterized,
that the reflector has a shape which favors the heat sink (6) when a turbulent or vortex-shaped air flow is generated.

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