EP2376829A1

EP2376829A1 - Led-based lighting system

Info

Publication number: EP2376829A1
Application number: EP09799576A
Authority: EP
Inventors: Frank Werz; Stefan Stauch
Original assignee: Poly-tech Service GmbH
Current assignee: POLY-LICHT GMBH
Priority date: 2008-12-17
Filing date: 2009-12-04
Publication date: 2011-10-19
Anticipated expiration: 2029-12-04
Also published as: DE102008062413A1; DE202008017960U1; EP2376829B1; WO2010076121A1

Abstract

The invention relates to the improvement of exterior lighting. The aim of the invention is to provide a lighting body for exterior lighting that has a very compact light-emitting element such that a lamp equipped therewith can be designed very compactly and still exhibit a high degree of illumination. This is achieved by means of a lighting body for exterior lighting having at least one light diode field (203) and a housing (201), wherein the light diode field has a plurality of light diodes that are surface-mounted on an individual carrier, wherein the light diodes have a diode element and an element having a luminophor allocated to said element, wherein the diode element and the element allocated thereto are arranged such that the light created by the diode element in operation actuates the luminophor, wherein the light diode field is arranged in the housing, wherein the housing is closed and has a substantially transparent section and having a heat transfer element arranged in the housing, wherein the carrier of the light diode field is thermally conductively connected to a fastening section of the heat transfer element.

Description

LED-based lighting system

The present invention relates to a luminaire for outdoor lighting comprising at least one light-emitting diode array and a housing, wherein the light-emitting diode array has a plurality of light-emitting diodes which are surface-mounted on a single support, wherein the light

5 diodes having a diode element and an associated therewith element with a luminophore, wherein the diode element and the associated therewith element are arranged so that the light generated in operation by the diode element excites the luminophore, wherein the light emitting diode array is disposed in the housing, wherein the Housing is completed and has a substantially transparent portion and with a disposed in the housing heat conducting element,

0 wherein the carrier of the light emitting diode array is thermally conductively connected to a mounting portion of the heat conducting element. Exterior lighting can be used, for example, for roads, parking lots, parking garages, tunnels and underpasses, mines, parks, gardens, sidewalks, squares and, more generally, outside of buildings.

5 Outside lighting today mainly uses sodium vapor lamps, mercury vapor lamps and so-called energy-saving lamps. The large number of lighting fixtures causes a considerable energy consumption. It is therefore desirable to use more efficient lighting techniques. These include, among other things, the light-emitting diode technology, which has a good efficiency and whose light can be relatively easily aligned, so that the used

! 0 energy can be used optimally. In addition, LEDs are dimmable, which allows further savings by adjusting the brightness. Another advantage is the fast turn-on and turn-off without warm-up times. It is also advantageous that the color of the light can be easily selected by using different diodes. Also, the generation of white light is possible by the actually colored light of a light emitting diode, which is even a narrow spectral

! 5 bandwidth can be converted with a luminophore into other wavelengths. The luminophore is illuminated with either a blue or an ultraviolet light emitting diode and converts the irradiation wavelengths by luminescence into longer wavelengths. With a suitable choice of the luminophore produces white light. Suitable materials for the luminophore are, for example, yttrium-aluminum-garnet (YAG) doped with cerium or a novel material containing an alkaline-earth orthosilicate and preferably activated with europium. The latter material is described in EP 1 347 517. Alternatively, red, green and blue LEDs can also be used in light-emitting diodes whose interaction produces white light. - -

A light-emitting diode can have different emission characteristics. The chip of a light emitting diode first radiates in all directions in its environment. Typically, reflectors are placed around the chip to focus the light in a preferred direction. The slightly col- lected light in this case, if it is a colored light-emitting diode, generally falls on a plastic lens which defines an opening angle.

The opening angle of a light-emitting diode describes the angular range over which the light exits the light-emitting diode. Outside the opening angle, the light emitting diode emits no light. If it is a white-light LED, between the chip and the plastic lens of the Lumi-

0 nophor be arranged. This performs the conversion of the light color before the light leaves the LED through the lens. Alternatively, the lens can also be omitted, whereby the properties of the luminophore and the nature of its embedding or its geometry determine the radiation characteristics. Basically, the luminophore emits diffuse light. For example, if the lumi- nophor is buried, the wall of the depression limits the opening angle.

5 kel and causes in this way a radiation that is more or less strongly directed depending on the geometric conditions. Alternatively, the luminophore may be free-standing and elevated in relation to its surroundings, whereby a particularly large opening angle is achieved, since the luminophore can still radiate practically in the plane of the surface into which it is embedded.

! 0

In the prior art outdoor lights are known in which light-emitting diodes are used. These are diode types with superior plastic lens optics. The light-emitting diodes used are designed as light-emitting diodes for through-hole mounting. The diodes for through-hole mounting generally have two metallic connecting wires, which through a

! 5 carrier plate can be inserted and soldered on the back of the carrier plate. Various designs are known, for example mushroom lights, post-top luminaires, sheet lights, whip lights or rope suspension lights.

Object of the present invention is compared to this prior art, a lighting iθ ment body for outdoor lighting, which has a very compact light-emitting element, so that a lamp equipped with it can be made very compact and yet has a high light output.

According to the invention, this object is achieved with a luminaire for outdoor lighting with S5 at least one light-emitting diode array and a housing, wherein the light-emitting diode array comprises a plurality of light-emitting diodes which are surface-mounted on a single carrier, wherein the light-emitting diodes comprise a diode element and an element associated therewith with a luminophore wherein the diode element and the element associated therewith are arranged so that - -

the light generated in operation by the diode element excites the luminophore, wherein the light emitting diode array is disposed in the housing, wherein the housing is closed and has a substantially transparent portion, and with a heat conducting element arranged in the housing, wherein the carrier of the light emitting diode array thermally conductive with a Befestigungsab- 5 section of the heat-conducting element is connected, solved.

Surface-mounted light-emitting diodes in so-called SMD packages are soldered directly onto the surface of a carrier. SMD LEDs have the great advantage that the chip can be arranged near the bottom inside the housing of the SMD LED, which is a

0 good heat transfer from the chip through the housing in the surface of the support plate allows. Due to the small external dimensions and the improved heat dissipation a much higher integration density of the SMD LEDs is possible. The carrier itself may be made of aluminum, or other highly conductive metals, such as copper; However, there are also known versions with a plastic board. A thermally even better version of the

5 surface mounting is the chip-on-board technology. In this case, the chips of the LEDs are not first applied in a housing, but directly on the surface of the carrier. The thermal resistance through the housing bottom is eliminated. The possible integration density is even higher due to the space savings and better heat dissipation.

A lighting fixture according to the invention with surface-mounted light-emitting diodes has the advantage that it can be made compact even by the compact light-emitting diode array. Due to these small dimensions, it is possible to use a lighting fixture according to the invention to replace lighting fixtures in existing outdoor lighting.

Advantageously, a grid dimension in the light-emitting diode array is smaller than 5.6 mm. This ensures that a high luminance of the LED array is achieved. This in turn requires small dimensions.

Advantageously, the emission characteristic of the light emitting diodes is substantially influenced by the luminophore. This makes it possible to easily emit white light with a large opening angle.

The carrier of the light emitting diode array is thermally conductively connected to a mounting portion of the heat conducting element. The heat-conducting element consists of several sections. The first S5 section serves to absorb the heat from the carrier of the LED array and forward it to the other sections. At least one of the further sections is thermally conductive with other elements for heat dissipation or directly with a heat sink in combination. These - -

Heat sink absorbs the heat generated by the light emitting diode array so that the light emitting diode array itself does not overheat.

Due to the enclosed housing, the elements 5 of the lighting fixture arranged inside the housing can withstand external influences such as rain or dust. Electrical and electronic components are protected from moisture even when exposed. The transparent section lets the light escape from the housing. The disadvantage of such a closed housing, however, is that the heat generated can not be readily dissipated into the environment. 0

In one embodiment, the heat-conducting element has at least one cooling section arranged in the housing.

This cooling section of the heat conduction element conducts the heat, which is introduced in the fastening section in FIG. 5, the heat conducting element, in the direction of a heat sink, whereby the section has a cooling effect on the light emitting diode array. This portion of the heat conducting element is disposed within the housing to dissipate the heat from the mounting portion, which is also located within the housing.

The cooling section can advantageously have at least one surface-enlarging element, in particular at least one cooling rib and / or at least one cooling bore, and release heat to the air in the interior of the housing, and / or at least one recess for improving the heat conduction in the longitudinal direction of the heat-conducting element, in particular at least one heat transport bore in the longitudinal direction of the heat conducting element included.

! 5

A cooling section according to this embodiment can transmit the heat emitted by the light emitting diode array (s) to the air located within the lighting fixture. This is in turn connected to the inner surfaces of the housing in combination, which advantageously has a low conductivity to the outside and, for example, advantageously be made of aluminum. As a result, the air in the interior of the lighting fixture can transmit the heat generated by the light-emitting diode fields via convection to the insides of the housing. Cooling fins or cooling holes on the heat-conducting element increase the contact area and thus the thermal transition between the heat-conducting element and the air. This transfers the heat more effectively to the air within the lighting fixture. The housing that houses the light emitting diode and

S5 surrounds the heat-conducting, the inner surface, which receives the heat from the air again, is significantly larger, so that can be dispensed with in one embodiment, measures to increase the thermally effective surface. Advantageously, a fan is arranged in the housing, the heat transfer by forcibly circulating the - -

Air improves. The surface-enlarging element can be embodied integrally with the heat-conducting element or be a separate element attached thereto.

The cooling section can also achieve a cooling effect by heat conduction to one or more heat sinks outside the lighting fixture. To support this, the cooling section can consist of thermally highly conductive material. In addition, the heat transfer can be improved by one or more internal recesses, which extend substantially in the transport direction of the heat to be dissipated by the heat conducting element, in particular bores or cylindrical recesses, in which the heat is transported faster by a medium flowing therethrough. The medium may be a gas, for example air, or a liquid, for example water with an antifreeze, or alcohol or other liquid, e.g. a liquid organic compound, which advantageously still remains liquid even in the temperatures typically occurring on the heat-conducting element in winter and does not yet boil at atmospheric temperature 5 during the summer, which typically occurs at the heat-conducting element. Advantageously, the bores can be connected at their ends for the overflow of medium from one bore to another bore, so as to provide a circuit in which the cooling medium can circulate and so by passive, or by forced with a pump or a fan Convection to dissipate heat.

! 0 An amount of water can also be used to increase the heat capacity of the heat-conducting element with little increase in weight, since water has a low specific gravity and a very high heat capacity. The usability of the heat capacity is described below.

The recess for improving the heat transport can also use the principle of a heat pipe! 5 (heat pipe). In this case, a liquid medium evaporates or evaporates at a point to be cooled within the recess, which is advantageous for the present invention in or near the attachment portion, and is reflected in a cooler place down. This is generally in the direction of the heat sink, which ultimately absorbs the heat, whereby the heat transfer can be significantly improved. The return transport of the medium to the point to be cooled is effected iθ by capillary force along wick elements or on the surface of the wall of the recess, which is advantageously structured in the transport direction, and / or by gravity. The recess is advantageously sealed tight to hold the media therein. Alternatively, a prefabricated, sealed heat pipe can be introduced into a recess for improving the heat transport. This is advantageous at least at the point to be cooled with S5 good thermal transition to the wall of the recess.

In a further embodiment, the heat-conducting element has two cooling sections, which are arranged such that the fastening section extends between the cooling sections. - -

By arranging the cooling sections around the attachment section, the heat is better dissipated since it can propagate in two directions toward a heat sink. In addition, this arrangement enables the light-emitting diode array to be fastened centrally on the heat-conducting element, whereby it can also be arranged centrally in a lamp. This in turn means more freedom in the design of elements for influencing the illumination around the light-emitting diode array.

The heat-conducting element is advantageously designed in several pieces, wherein preferably the attachment section and a cooling section form separate parts.

The use of a multi-part heat conducting element affords the possibility, in the case of a defective or used light-emitting diode field, of the light-emitting diode array, together with the first part on which the fastening section is arranged, of another part of the heat conducting element,

5 on which the cooling section is arranged to separate. The advantage is that the junction between the light emitting diode array and the portion with the mounting portion need not be disconnected while installed in the lamp. This may be due to circumstances when changing, e.g. Working at great heights on a slightly unstable aerial work platform, possibly even in cold weather, and due to the small size of the LED field fasteners.

! 0 For example, small screws or clamps, be a difficult operation. This operation may be performed after removal of the first part with the mounting portion and the light-emitting diode array under suitable conditions, e.g. in the factory. By contrast, the part of the heat-conducting element with the light-emitting diode array can be attached to a further part of the heat-conducting element or another with fastening means which are easy to detach even under difficult conditions

! 5 elements of a lamp. A lamp base or a lamp cover, which dissipates heat by solid conduction from the housing, for example into a mast or to the ambient air, can also be a part with a cooling section of the heat-conducting element due to its cooling function. The attachment portion portion may additionally include cooling portions located on the portion. iθ

In a further embodiment, the cross section of the fastening section is a polygon, preferably a quadrangle or a triangle and particularly preferably an equilateral triangle, wherein at least one light-emitting diode array is thermally conductively connected to one, several or each of the side faces of the fastening section.

15

Such a design of the mounting portion of the heat conducting element offers several advantages. The execution of the cross section over the portion to which at least one light emitting diode array is attached, as a polygon allows that flat surfaces are present, where the - -

Carrier of the LED array can rest flat. This ensures a good heat transfer between the carrier in the first part of the heat conducting element. Another advantage is that the lighting fixture can be adapted to the lighting situation by the design as a regular or irregular polygon. For example, is the opening angle

5 of the light-emitting diode array 120 °, so a round lighting can be achieved with a mushroom lamp on a mast with an equilateral triangle. For example, if one area is to be left open and another area is to be more strongly illuminated, an isosceles or irregular triangle can be used as a cross section for the first part of the heat conduction element, one or more light emitting diode arrays being applied to two of the three sides

0 become. For example, in the case of an arc lamp, it may be advantageous to illuminate the edge regions of the illumination which are farther from the lamp, in order to achieve a generally wider illumination with a lamp. For targeted stronger illumination of several angular directions and quadrangles or pentagons can be used and by setting the angle in the respective polygons the emission characteristics are determined.

5

In one embodiment, the cross-section of the attachment portion is a pentagon, with only three of the side surfaces of the attachment portion being connected to light-emitting diode arrays.

Particularly advantageous is the execution as a pentagon, in particular as an irregular pentagon, at! 0 the three surfaces are perpendicular to each other and the two other surfaces are at an acute angle to each other and at an obtuse angle to the first three surfaces. The obtuse angles are advantageously the same size. On the middle of the three mutually perpendicular surfaces and the two surfaces at an acute angle to each other is advantageously arranged in each case a light-emitting diode array. With such an arrangement, it is possible with a lamp in which! 5 such element is arranged vertically, for example, with a mushroom lamp to make a targeted illumination of a road. The pentagon is arranged in the lamp so that the two light emitting diode arrays, which are arranged on the pointed surfaces, illuminate the street, and the third of the light emitting diode fields illuminated the walkway and possibly existing buildings. It is also possible to use cross-sections with polygons of even higher order iθ than five in order to make the illumination even more targeted. The polygonal design of the first part of the heat-conducting element therefore makes it possible in a simple manner to adapt the emission characteristic of a lighting fixture to the place of use.

In order to be able to apply light-emitting diode arrays to the surfaces of the polygons, it is necessary that the polygonal cross-section of the first part of the heat-conducting element be constant over at least the length or the width of a light-emitting diode array. Alternatively, the surfaces on which the light-emitting diode arrays are arranged may be inclined to the longitudinal axis of the heat-conducting element, that is, for example, the surfaces of the mounting portion may be a truncated tetrahedron - -

or form a truncated pyramid or corresponding bodies with pentagonal or irregular polygonal cross-section. In this way, the light of the LED array can be directed downwards, thereby the light can be used more effectively to illuminate the street, as it is directed directly there. The thermally conductive connection between the first part of the 5 Wärmeleitelements and the light-emitting diode array is preferably realized by pressing the carrier to the first guide element and advantageously improved by the introduction of thermal paste in the connection point.

In a further advantageous embodiment, the first part of the heat-conducting element of the lighting fixture for external lighting has a continuous hole in the longitudinal direction.

Such a through hole offers the possibility of attaching the first part of the heat-conducting element by plugging on this hole to a counterpart. If the hole is located substantially in the center of the profile, heat flow from the LED panels to the heat sink or sinks is only marginally impeded, provided that they are at one or both ends in the longitudinal direction of the first part of the heat conducting element.

In a further embodiment of the lighting fixture for outdoor lighting, it has a lamp base, wherein, starting from the lamp base, a rod-shaped holding element extends for receiving the heat-conducting element.

The heat-conducting element can be plugged onto the rod-shaped retaining element. Such a connection offers the advantage that the heat-conducting element with the light-emitting diode array can be easily separated from the lamp base, in particular if it is a mushroom lamp or a pole lamp.

! 5 top light is on. In this case, the lid can be removed, the optional existing attachment of the heat conduction on the rod or the lamp base or on a further element of the lamp can be solved and the first portion of the heat conducting element with the light emitting diode arrays are removed from the lamp. Advantageously, the lamp base is designed so that the axial end face of the first part of the heat-conducting element rests on a mating surface on the lamp base and is pressed against it. Alternatively or additionally, the cover or a further part of the heat-conducting element can be pressed against the opposite end of the first part of the heat-conducting element on the axial surface. Alternatively or in addition to the axial surfaces and the peripheral surfaces or the inner surface of the bore can be used as contact surfaces for a good heat transfer. The thermally connected counterparts

S5 elements are advantageously formed in a corresponding area as a geometrically matching counterpart to the corresponding contact surface. Advantageously, thermal compound is introduced into the joints. Alternatively, the heat-conducting element can also be attached to the ends of a - -

Clamping pin are pressed, which is arranged in a bore across the lamp base and overhangs.

As an alternative to the fact that the first part of the heat-conducting element has a through hole in the longitudinal direction, it can also have one or more holes in the transverse direction. They can serve for fastening the first part of the heat-conducting element to a lamp base or to other parts of the lamp. The arrangement in the transverse direction has the advantage that with bulbs that are to be opened at the periphery, such as arc lamps, which are attached to a curved mast, a simpler replacement of the first part of the heat conducting is possible. 0

Due to the thermal connection with the heat-conducting element and the associated cooling effect on the light-emitting diode array, the lamp base can be part of the heat-conducting element, which has a cooling section.

In a further embodiment, the rod-shaped retaining element has a threaded section at its end remote from the lamp base.

On the threaded portion, a nut for fastening and pressing the heat-conducting element are screwed to the lamp base. ! 0

In a further embodiment, the lamp base engages through the housing and has on the outside a receptacle for a mast.

This creates a stable connection between the mast and the heat conducting element. In addition, a heat dissipation capability is provided out of the housing by making the lamp base in this way a thermal connection between the heat conducting element and thus the light emitting diode array and the mast, if it has a suitable thermal conductivity.

In a further embodiment, the lamp base and / or the heat-conducting element consists essentially of metal, preferably of aluminum.

By means of such a material, a good thermal conductivity of the first part of the heat-conducting element or the lamp base is ensured. Aluminum can be used for a particularly good cost / benefit ratio S5 since the thermal conductivity is comparatively high compared to the price per volume. In addition, the dimensions of the first part of the heat conducting element or the lamp base can be smaller compared to other metals, since the thermal conductivity is higher. - -

A further embodiment of the lighting fixture for external lighting is designed such that the heat-conducting element is thermally conductive with an element outside the housing, preferably with a lampshade or a mast, which in turn is thermally connected to a heat sink 5 outside the housing or even represents such connected is.

The elements or components mentioned serve to couple the heat flow from the light-emitting diode array to a heat sink. Heat sinks may be, for example, the ambient air, a large part of the building or the ground. In this way, the light-emitting diode array is also

0 mixed with one or more heat sinks. The connection of said elements to the ambient air can be improved by increasing the surface area. For this purpose, cooling fins may be arranged on the respective elements, which advantageously extend vertically, in order to allow a better passing of the air through thermal convection. For thermal connection with one of the heat sinks, in particular ground or building part, the mast

5 or other fastening means which connect the lamp to the heat sink, be made thermally well conductive. For this they can, for example, consist essentially of aluminum.

A good thermal connection is achieved, for example, by a heat sink, which consists of solid material, as large as possible in direct contact with the heat-conducting element.

0 is brought. For example, a surface of the heat-conducting element can be pressed against a surface of the heat sink. Advantageously, to improve the heat transfer, a thermal paste can be introduced into the connection point. If the heat sink is gaseous, for example the ambient air, then a thermally good conductive coupling can be realized, for example, by cooling fins, which communicate with the ambient air over an enlarged area.

5 hen. The large outer surfaces of a mast or a lid in itself can already represent a good coupling. The mast can thus emit heat both into the ground and to the ambient air.

In an embodiment in which portions of the heat conduction member receive heat during the operating cycle iθ of the light emitting diode array to emit it to a heat sink outside the housing during the off state of the light emitting diode array, a thermal transition to a heat sink enables only this mode by absorbing the heat received the heat capacity during the time in which no operation takes place, can flow to the heat sink. If the heat capacity of the heat conducting element is low compared to the derived heat S5 ge per operating cycle, the thermal transition to the heat sink ensures that the heat generated by the diode array can be dissipated to the heat sink without significant buffering, so that the heat sink LED field not overheated. An operating cycle is typically a duty cycle during one night. - -

In a further embodiment of a lighting fixture for external lighting, the heat capacity of the heat-conducting element is chosen such that it can absorb the heat emitted by the light-emitting diode field of an operating cycle minus the heat flowing away during the operating cycle, wherein the temperature of the light-emitting diode array during operation is the permissible temperature does not exceed.

One skilled in the art will appreciate that the heat capacity of an element is calculated from the specific heat capacity, which is material dependent, multiplied by the volume of the element

0 can. The heat that absorbs such a heat capacity is determined by the heat capacity multiplied by the temperature difference that undergoes the heat capacity. The heat that emits the light-emitting diode array during an operating cycle can be calculated by a person skilled in the art by multiplying the power loss of the light-emitting diode array by the operating time. In order to realize a suitable heat capacity of the heat-conducting element, the heat-conducting element may be made of a material

5 can be realized with a suitable specific heat capacity in conjunction with a suitably large volume. During the design, it must be taken into account that the temperature increase that the heat-conducting element experiences as a result of the heat storage does not go so far that the permissible temperature of the LED field is exceeded. This design model does not take into account that heat can also flow away during this time.

! 0

In a further embodiment, the lighting fixture illuminates a reflector element.

A reflector element can influence the emission characteristic of a luminaire. It is advantageously positioned and shaped in such a way that the desired emission characteristic is produced, for example, it reflects upward emitted light downwards in the direction of a road. For this purpose, it can be designed, for example, annular and be arranged above one or more light-emitting diode arrays.

Advantageously, in another embodiment, the heat dissipation from the light-emitting diode array iθ is dimensioned to be thermally conductive such that the heat flow from the light-emitting diode field produces at most a temperature difference between one or more heat sinks and the light-emitting diode array, through which the light-emitting diode array does not exceed a permissible maximum temperature.

One skilled in the art will appreciate that the thermal resistance of an element is calculated from the thermal S5 conductivity of the material making up the element multiplied by the cross section of the element divided by the length of the element. If these quantities are not constant, it can be integrated to calculate the thermal resistance. Alternatively, for a high accuracy calculation, a finite element simulation of the thermal behavior - -

Nisse be performed to determine the thermal resistance of the element. To increase the heat dissipation, the cross section of the heat conducting element can be increased transversely to the direction of the heat flow, the length can be reduced in the direction of the heat flow, or a thermally more conductive material can be used. The heat sink represents the environment. This has the egg

5 genschaft that their temperature does not increase significantly, although heat from the light-emitting diode via the heat-conducting element flows into it. By the temperature of the heat sink and a permissible temperature of the LED array, a temperature difference can be defined, which can flow the heat from the LED array through the heat-conducting. For the design of the thermal resistance, the temperature of the heat sink is considered to be that in the permissible

For example, the temperature that the heat sink has on a warm summer night is set at the maximum operating temperature. The permissible temperature of the LED field is determined by the thermal capacity of the diodes. The permissible temperature is determined by the manufacturer of the light-emitting diodes or the light-emitting diode array used and can be, for example, 70 ^° C.

5

If several heat sinks are present, there is a parallel connection of parts of the heat conducting element to the heat sinks. If the heat sinks have different temperatures, e.g. a mast and the ambient air, the individual thermal resistances of the parts of the heat-conducting element from the light-emitting diode array to the heat sink are advantageously designed in such a way that the heat dissipation via the respective thermal resistances produces at most temperature differences between the light-emitting diode array and the respective heat sinks, which lead to that the permissible temperature at the LED field is not exceeded. For this purpose, not only a thermal resistance must be designed accordingly, but the fulfillment of the criterion that the permissible temperature at the LED array is not exceeded, can

! 5 can be achieved by designing several or all of the thermal resistances.

The types of design, the heat during the operating cycle in the heat conduction between stored or derive the heat through the heat conduction in a heat sink, flow into each other, as always both effects occur simultaneously. Thus, heat will flow into the heat capacity when the heat is applied, with heat also being dissipated from the heat-conducting element into a heat sink. An integrated design thus takes into account both effects. The heat capacity of the heat-conducting element can therefore be chosen smaller at the same temperature conditions corresponding to the amount of heat that is emitted from the heat-conducting element by heat dissipation to a heat sink. The thermal resistances and the

S5 heat capacity can be adjusted to each other in such a way that the permissible temperature of the LED field is not exceeded. - -

In a further embodiment, the lighting fixture for external lighting comprises a plurality of light-emitting diode arrays, preferably three light-emitting diode arrays.

With light-emitting diode arrays, which typically have an opening angle of 120 °, all-round illumination can be achieved with only three 5 light-emitting diode arrays. The light-emitting diode arrays are advantageously arranged in this case at an angle of 60 ° to each other.

In a further embodiment, the housing for a lighting fixture for outdoor lighting is dustproof and watertight, and preferably at least IP 54 dustproof and waterproof.

Since lamps for outdoor lighting are exposed to the harsh environmental conditions, of which especially rain and dust are harmful to the lighting fixture, it is advantageous to protect the lighting fixture inside the lamp housing in front of it. The degree of protection IP 54 means 5 protection against splashes of water on all sides and protection against dust deposits. Such protection can be achieved by a design of the housing with seals or sealant at the points where touch parts of the housing. Alternatively, the tightness can be achieved without seals by a high manufacturing quality and good fits.

In a further embodiment, the light emitting diode array and the first part of the heat conducting element are advantageously made so compact that existing other types of light sources, for example the filaments of sodium vapor lamps or mercury vapor lamps, can be replaced by them. The dimensions of the first part of the heat-conducting element with the light-emitting diode field do not exceed the corresponding dimensions of the luminous body to be replaced.

! 5

In a further embodiment, the lamp base of a lighting fixture according to the invention is designed so that an existing base or lamp base for a luminous element can be exchanged for a lamp base according to the invention. For this purpose, in particular, the attachment points of the lamp base are designed so that for fastening the fastening means can be used, which are also used for fastening the base to be replaced. It can also be used only parts of the fastening means, for example, only holes through the lamp housing or other parts of the lamp.

Further advantages, features and possible applications of the invention will become apparent from the following description of preferred embodiments and from the associated figures. Show it:

1 shows a cross section of a mushroom lamp according to the prior art, - -

FIG. 2 shows a cross-section of a mushroom lamp according to an embodiment of the invention,

FIGS. 3A to 3C are cross sections through the heat conducting element shown in FIG. 2 with a pentagonal cross section, and FIGS

FIGS. 4A to 4C show cross sections through the heat conducting element shown in FIG. 2 with a fastening section with a triangular cross section.

In the figures, the reference numerals are chosen so that the first digit corresponds to the number of the figure. The following numbers indicate the features and elements in the figures, wherein corresponding sequence numbers with different first numbers indicate the same or similar, similar features and elements in another figure.

FIG. 1 shows a cross section of a prior art mushroom lamp 100. The mushroom lamp 100 consists of a lamp base 101, a luminous means carrier 102 which carries a lighting means 103, for example a light bulb, a neon tube or a mercury or sodium vapor lamp, a cover 104, a screen 105 which surrounds the illuminant carrier 102 and a transformer 106, which is arranged in the illuminant carrier 102. The lid 104 is with a

! 0 connector 107 connected to the lamp carrier. The screen 105 is transparent so that the illuminant can illuminate the surroundings of the mushroom lamp all around. The illuminant carrier 102 is inserted into the lamp base 101 and secured with a stud screw 108. The lamp base 101 also carries the screen 105.

In contrast, FIG. 2 shows a cross-section through a mushroom lamp 200 according to the invention, which is modified by a heat-conducting element 202 and a light-emitting diode array 203 according to the invention. The lamp base 201 of the embodiment of the present invention is identical to the prior art lamp base 201, as well as the lampshade 205 and the lid 204.

iθ On the lamp base 201, the heat conducting element 202 is arranged according to the invention. The heat-conducting element 202 consists of a lower section 221, which is designed as a heat sink, a middle section 220, which carries three light-emitting diode arrays 203 as the fastening section, and an upper section 222, which is likewise designed as a heat sink. By the heat conducting element 202 extends a bore 312 in the longitudinal direction, through which a tube 211 is inserted. The pipe

S5 211 is fixed in the lamp base 201 with a stud 208. The Wärmeleitelement 202 is pulled by a thread at the end of the tube 211, which faces the cover 204, and a nut 210 against a dowel pin 209 which is inserted through a bore which extends transversely through a directed to the heat conduction member, and projects from it , The heat-conducting element is - -

safely connected to the tube 211 in this way. The tube 211 protrudes into a receptacle 207 on the inside of the lid 204 and thus ensures the alignment of the heat-conducting element 202 in the mushroom lamp 200. By this construction, the heat conduction member 202 can be easily removed from the mushroom lamp by removing the cover, the nut 210 unscrewed and 5, the heat conduction from the tube 211 is pulled up. The installation can be done in the same simple way in reverse order.

The light-emitting diode array 203 is screwed onto the middle section 220 of the heat-conducting element 202. At the lower portion 221 of the Wärmeleitelements 202, a transformer 206 is angeord- 0 net, which supplies the light emitting diode arrays with electrical energy from the customary low-voltage network.

FIG. 3A shows a substantially square cross-section through the upper section 322 of the heat-conducting element 202. In the middle of the cross section, the through-hole 312 is arranged. On all four sides of the upper portion 322 of the Wärmeleitelements cooling fins 313 are arranged.

FIG. 3B shows a cross section of the heat-conducting element 202 in its middle section 220, 320. In this section 320, the heat-conducting element 202 has a pentagonal cross-section. Here Han

! 0 it is an irregular pentagon, in which three of the adjacent sides 314, 315 and 316 are connected by right angles and the other two sides 317 and 318 to each other at an acute angle and each with an obtuse angle> 90 ° pages 315 and 316 are connected. Pages 315 and 316 have equal lengths. The sides 314, 317 and 318 each carry a light-emitting diode array 303. Inside the cross-section is approximately in the area

! 5 chenschwerpunkt the through hole 312 arranged.

The formation of the cross section as an irregular pentagon with the said occupancy of the sides with light-emitting diode arrays has the advantage that the emission characteristic of the lamp is favorably influenced for outdoor lighting. The two light-emitting diode arrays on the sides 317 and iθ 318 serve to illuminate a street, the angles being chosen so that the main emission direction from the individual LED array is oblique toward the street and further illuminates it in comparison to all-round all-round illumination. The LED field on page 314 illuminates the walkway and buildings behind. When replacing the Wärmeleitelements therefore requires the installation of a spare part

S5 of the same angular orientation take place. To facilitate this, a device may be provided which allows the correct installation only in the correct angular orientation. - -

FIG. 3C shows a cross-section of the heat-conducting element in its lower section 321. In the middle of the cross section, the through hole 312 is arranged. Three of the sides of the substantially rectangular cross section are formed as cooling fins 319. On the fourth side, a transformer 306 is fixed to the lower portion 321 of the heat conducting member 302.

5

Figure 4A shows a substantially square cross section through the upper portion 422 of the Wärmeleitelements 202. In the middle of the cross section, the through hole 412 is arranged. On all four sides of the upper portion 422 of the Wärmeleitelements cooling fins 413 are arranged.

0

FIG. 4B shows a cross section of the heat-conducting element 202 in its middle section 220, 420. In this section 420, the heat-conducting element 202 has a triangular cross-section. This is an equilateral triangle, with the three sides 414, 417 and 418 connected by equal angles of 60 ° each. The pages have the same length and each carry a light emitting diode

5 denfeld 403. Inside the cross section, the through hole 412 is arranged approximately at the centroid.

The formation of the cross-section as an equilateral triangle with the above-mentioned occupancy of the sides with LED fields has the advantage that the emission of the luminaire despite the onset of only three light-emitting diode fields completely unobstructed radiation when the LED array has an opening angle of at least 120 ° , This allows a uniform ring-around lighting can be realized.

FIG. 4C shows a cross section of the heat-conducting element in its lower section 421. ! 5 In the middle of the cross section, the through hole 412 is arranged. Three of the sides of the substantially rectangular cross section are formed as cooling fins 419. On the fourth side, a transformer 406 is fixed to the lower portion 421 of the heat conduction member 202.

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LIST OF REFERENCE NUMBERS

100 Cross section of a prior art mushroom lamp

101 lamp base

5 102 illuminant carrier

103 bulbs

104 Lid

105 screen

106 transformer

0 107 connector

108 stud screw

200 Cross section of a mushroom lamp according to the invention

201 lamp base

202 Heat-conducting element 5 203 Light-emitting diode field

204 lid

205 screen

206 transformers

207 recording

! 0 208 Stud screw

209 tension pin

210 mother

211 pipe

220 Middle section of the heat conducting element

! 5 221 Lower section of the heat-conducting element

222 Upper section of the heat-conducting element

303 light-emitting diode field

306 transformer

312 through hole

IO 313 cooling fins

314 First page of the pentagon

315 Second side of the pentagon

316 Third side of the pentagon

317 Fourth side of the pentagon S5 318 Fifth side of the pentagon

319 cooling fins

320 cross section of the central portion of the heat conducting element

321 Cross section of the lower portion of the heat conducting element

322 Cross-section of the upper section of the heat-conducting element K) 403 Light-emitting diode field

406 transformer

412 through hole

413 cooling fins

414 First side of the triangle \ 5 417 Second side of the triangle

418 Third side of the triangle

419 cooling fins

420 cross section of the central portion of the heat conducting element

421 Cross section of the lower section of the heat conducting element> 0 422 Cross section of the upper section of the heat conducting element

Claims

- P atentanspr che

A lighting fixture for exterior lighting comprising at least one light emitting diode array 5 (203) and a housing (201, 204, 205), said light emitting diode array (203) comprising a plurality of light emitting diodes surface mounted on a single support, said light emitting diodes being a diode element and having an element associated therewith with a luminophore,

Wherein the diode element and the element associated therewith are arranged so that the light generated by the diode element during operation excites the luminophore, the light emitting diode array (203) being disposed in the housing (201, 204, 205), the housing (201 , 204, 205) and has a substantially transparent portion (205),

5 and with a in the housing (201, 204, 205) disposed heat conducting element (202), wherein the carrier of the light emitting diode array (203) is thermally conductively connected to a mounting portion (220) of the Wärmeleitelements (202).

2. Lighting fixture for outdoor lighting according to claim 1, characterized in that the heat-conducting element (202) has at least one cooling section (221, 222) arranged in the housing (201, 204, 205).

3. Lighting fixture for outdoor lighting according to one of the preceding claims, characterized in that the cooling section (221, 222) at least one oberflächenver-

5 larger element for the delivery of heat to the air inside the housing (201, 204,

205), in particular at least one cooling rib (313, 319) and / or at least one cooling bore, and / or at least one recess for improving the heat conduction in the longitudinal direction of the heat conducting element, in particular at least one heat transport bore in the longitudinal direction of the heat conducting element contains. iθ

4. Lighting fixture for outdoor lighting according to one of the preceding claims, characterized in that the heat-conducting element has two cooling sections (221, 222) which are arranged so that the fastening section (220) extends between the cooling sections (221, 222).

S5

5. Lighting fixture for outdoor lighting according to one of the preceding claims, characterized in that the heat-conducting element (202) is made in several pieces, wherein - -

preferably the attachment portion (220) and a cooling portion (221, 222) form separate parts.

A lighting fixture for outdoor lighting according to any one of the preceding claims, characterized in that the cross-section of the mounting portion (220, 320) is a polygon, preferably a quadrangle or a triangle and more preferably an equilateral triangle, with a plurality or each of Side surfaces (314, 315, 316, 317, 318) of the attachment portion (220) each having at least one light-emitting diode array (203, 303) is thermally conductively connected.

7. A lighting fixture for outdoor lighting according to any one of the preceding claims, characterized in that the cross-section of the mounting portion (220, 320) is a pentagon, with only three of the side faces (314, 315, 316, 317, 318) of the mounting tab

5 sections (220, 320) with light emitting diode arrays (203, 303) are connected.

8. Lighting fixture for outdoor lighting according to one of the preceding claims, characterized in that the heat-conducting element (220) has at least one through hole (312) in the longitudinal direction.

! 0

9. Lighting fixture for outdoor lighting according to one of the preceding claims, characterized in that it comprises a lamp base (201), wherein starting from the lamp base (201) a rod-shaped holding element (211) for receiving the heat-conducting element (202) extends.

! 5

10. Lighting fixture for outdoor lighting according to one of the preceding claims, characterized in that the rod-shaped holding element (211) at its end remote from the lamp base (201) has a threaded portion.

iθ 11. Lighting fixture for outdoor lighting according to one of the preceding claims, characterized in that the lamp base (201) through the housing (201, 204, 205) passes through and on the outside has a receptacle for a mast.

12. Lighting fixture for outdoor lighting according to one of the preceding claims, S5, characterized in that the lamp base (201) and / or the heat-conducting element (202) in

Substantially made of metal, preferably made of aluminum. - -

13. Lighting fixture for outdoor lighting according to one of the preceding claims, characterized in that the heat-conducting element (202) thermally conductive with an element outside the housing (201, 204, 205), preferably with a lampshade (205) or a mast, in turn is thermally connected to a heat sink outside the housing (201, 204, 205) or even represents such is connected.

14. Lighting fixture for outdoor lighting according to one of the preceding claims, characterized in that the heat capacity of the Wärmeleitelements (202) is selected so that it received by the light emitting diode array (203) heat of an operating cycle minus the effluent during the operating cycle heat absorb can, where the

Temperature of the LED field during operation does not exceed the permissible temperature.

15. Lighting fixture for outdoor lighting according to one of the preceding claims, characterized in that the lighting fixture illuminates a reflector element.