EP2401543B1 - Aussenraum-beleuchtungseinheit - Google Patents

Aussenraum-beleuchtungseinheit Download PDF

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Publication number
EP2401543B1
EP2401543B1 EP10717521.8A EP10717521A EP2401543B1 EP 2401543 B1 EP2401543 B1 EP 2401543B1 EP 10717521 A EP10717521 A EP 10717521A EP 2401543 B1 EP2401543 B1 EP 2401543B1
Authority
EP
European Patent Office
Prior art keywords
light source
led light
lighting unit
section
housing element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP10717521.8A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2401543A1 (de
Inventor
Mustafa Dinc
Norbert Pieper
Gerd Schnorrenberg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vishay Electronic GmbH
Original Assignee
Vishay Electronic GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vishay Electronic GmbH filed Critical Vishay Electronic GmbH
Publication of EP2401543A1 publication Critical patent/EP2401543A1/de
Application granted granted Critical
Publication of EP2401543B1 publication Critical patent/EP2401543B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F21S8/08—Lighting devices intended for fixed installation with a standard
    • F21S8/085—Lighting devices intended for fixed installation with a standard of high-built type, e.g. street light
    • F21S8/086—Lighting devices intended for fixed installation with a standard of high-built type, e.g. street light with lighting device attached sideways of the standard, e.g. for roads and highways
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V15/00—Protecting lighting devices from damage
    • F21V15/01—Housings, e.g. material or assembling of housing parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V17/00—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages
    • F21V17/10—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening
    • F21V17/107—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening using hinge joints
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V19/00—Fastening of light sources or lamp holders
    • F21V19/04—Fastening of light sources or lamp holders with provision for changing light source, e.g. turret
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/502—Cooling arrangements characterised by the adaptation for cooling of specific components
    • F21V29/505—Cooling arrangements characterised by the adaptation for cooling of specific components of reflectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/75—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with fins or blades having different shapes, thicknesses or spacing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/76—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
    • F21V29/763—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section the planes containing the fins or blades having the direction of the light emitting axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/005—Reflectors for light sources with an elongated shape to cooperate with linear light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • F21S2/005—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction of modular construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V19/00—Fastening of light sources or lamp holders
    • F21V19/001—Fastening of light sources or lamp holders the light sources being semiconductors devices, e.g. LEDs
    • F21V19/003—Fastening of light source holders, e.g. of circuit boards or substrates holding light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V21/00—Supporting, suspending, or attaching arrangements for lighting devices; Hand grips
    • F21V21/10—Pendants, arms, or standards; Fixing lighting devices to pendants, arms, or standards
    • F21V21/116—Fixing lighting devices to arms or standards
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V21/00—Supporting, suspending, or attaching arrangements for lighting devices; Hand grips
    • F21V21/14—Adjustable mountings
    • F21V21/30—Pivoted housings or frames
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/10—Outdoor lighting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/10—Outdoor lighting
    • F21W2131/103—Outdoor lighting of streets or roads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/10—Outdoor lighting
    • F21W2131/105—Outdoor lighting of arenas or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
    • F21Y2103/10—Elongate light sources, e.g. fluorescent tubes comprising a linear array of point-like light-generating elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00—Planar light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00—Planar light sources
    • F21Y2105/10—Planar light sources comprising a two-dimensional array of point-like light-generating elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the invention relates to an outdoor lighting unit for illuminating roads, footpaths, industrial outdoor facilities and the like (e.g., railway facilities, aircraft taxiways, parking lots, houses, campgrounds, sports fields, etc.).
  • industrial outdoor facilities e.g., railway facilities, aircraft taxiways, parking lots, houses, campgrounds, sports fields, etc.
  • the housing may have a planar mounting portion for an LED light source at the bottom and a convexly curved cooling portion with cooling channels at the top.
  • document FR 2 913 483 A1 describes a lighting unit with an LED light source and a housing having a flat mounting portion for the LED light source on a bottom and is convexly curved at the top and provided with cooling channels.
  • This object is achieved by an exterior lighting unit with the features of claim 1.
  • This lighting unit has an LED light source with a plurality of light emitting diodes in a two-dimensional, ie planar arrangement. Furthermore, the lighting unit has a housing, which comprises a one-piece solid housing element.
  • This housing element has on a lower side (relative to the position of use of the lighting unit) at least one planar mounting portion on which a rear side of the LED light source is fixed in a flat and in heat-conducting connection.
  • the housing element further has on the underside a peripheral edge portion which projects downwardly with respect to the plane of said mounting portion (again with reference to the position of use of the lighting unit).
  • the housing member On an upper side, has an exposed cooling portion which is convexly curved and has a plurality of cooling channels extending along the convex curvature.
  • the housing element comprises a holding portion by means of which the lighting unit on a holding device, for example on a mast, cantilevered is fastened.
  • the housing element Since the housing element is formed integrally and solidly with said various sections, the housing element serves not only for receiving the LED light source. But the housing member also forms an effective heat sink for the LED light source having a high heat capacity and a good heat conduction from the mounting portion for the LED light source to all of said other portions of the housing member. Due to the planar arrangement of the LED light source on the mounting portion of the housing element efficient transmission of waste heat of the LED light source is ensured on the housing element, wherein a direct surface contact, an indirect surface contact (eg via a thermal paste) or a slight air gap can be provided can. Due to the one-piece design, a simple production of the housing element and a simple installation of the lighting unit are possible.
  • peripheral wall portion of the housing member on the underside of a mounting volume is formed, in which the LED light source can be arranged, in particular together with a reflector device.
  • the downwardly projecting arrangement of the wall section corresponds to a bell-like enclosure of the LED light source, whereby a particularly good protection against environmental influences is ensured.
  • the top of the housing element serves as a cooling section to that of the LED light source effectively dissipate absorbed heat to the environment.
  • This cooling section is exposed, i. he is directly exposed to the environment of the lighting unit. Due to the convex curvature of the cooling section and the formation of a plurality of cooling channels, an air flow can be utilized particularly effectively for cooling purposes. Namely, ambient air heated by the case member and flowing upward is guided along the cooling passages, resulting in an increase in the flow rate (channel effect) and an increase in the area detected by the air flow. Furthermore, cooling of the housing element and self-cleaning effects by precipitation are possible, which acts on the housing element from above and flows down along the cooling channels (rain, melted snow or molten ice).
  • a holding portion on said housing member results in not only a particularly simple construction of the lighting unit with few components, but also a good heat transfer to the holding device, which can thus serve as an additional heat sink, especially for adjacently arranged electronic or electrical components of the lighting unit with a particularly high heat output (eg power supply, control unit).
  • the LED light source optionally includes one or more modules having an anisotropic beam angle characteristic, i. in different solid angle ranges, a different radiation flux is emitted (X / Y characteristic).
  • the mounting portion of the housing member is configured to selectively receive a single module (having a predetermined beam angle characteristic), or a plurality of modules (having a respective predetermined beam angle characteristic) in a longitudinal array, or to receive a plurality of modules of the LED light source in a transverse array.
  • the plurality of modules may optionally be arranged side by side in a longitudinal direction or juxtaposed in a transverse direction.
  • the mounting portion of the housing member has a "+" - shape, that is, the mounting portion is substantially cross-shaped.
  • a plurality of modules of the LED light source may optionally be mounted side by side on the mounting portion in a longitudinal arrangement or in a transverse arrangement.
  • the housing element extends from the said holding section along a longitudinal direction, wherein the cooling channels of the cooling section extend substantially perpendicular to this longitudinal direction.
  • the lighting unit which is already characterized by a high stability due to the one-piece design of the explained housing element, can withstand particularly high wind loads. If the wind does not act on the relatively narrow front or rear side, but on one of the longitudinal sides of the housing element, the reduced air resistance due to the transverse cooling channels makes itself advantageously noticeable. This is particularly important when the lighting unit is used for illuminating streets, since the lighting unit is typically arranged free-standing in this case and is supported only by a mast as a holding device, so that the lighting unit is exposed to the air currents unprotected.
  • a particularly cost-effective production of the housing element results when this is formed as a cast part, for example made of a light metal.
  • the housing element is made of a seawater-resistant aluminum alloy, specifically without special surface treatment on the upper side, ie on the said cooling section.
  • an AlMg or AlMgMn alloy can be used (in particular AlMg2Mn0.8 or AlMg4.5Mn).
  • no natural oxide layer is formed on the housing element and also no anodic Oxidation (anodization) is made, namely, results in a better self-cleaning effect at the top of the housing element, which in the long term ensures better heat dissipation to the environment.
  • no additional layers are attached to the top (eg, paint)
  • heat insulation by outermost layers is avoided, which also contributes to good heat transfer to the environment. If this additional effect is not required for a desired application, however, a housing element made of a seawater-resistant aluminum alloy with an additional surface protection (eg paint, coating) can also be used.
  • said cooling channels preferably have a width at least half their depth (at least about three times as large) as the width of ribs, which are formed on the cooling section between the cooling channels.
  • the said cooling channels have a width of at least 10 mm at the half of their depth, in particular a width of at least 15 mm. Furthermore, it is preferred if the cooling channels have a depth of at least 15 mm.
  • a desired self-cleaning effect is enhanced at the top of the housing element, for example, rainwater without disturbing surface tension effects penetrate well into the cooling channels, these wet, flow out of the cooling channels and this can also entrain contaminants.
  • the cooling channels preferably taper, wherein the bottom of the cooling channels is concavely curved in cross section, for example with a radius of curvature of about 5 mm.
  • air turbulences can be set at the bottom of the cooling channels, which have an advantageous effect on the heat transfer from the cooling section of the housing element to the environment.
  • the housing of the illumination unit may have a covering device which can be fastened to the underside of the wall section of the housing element and which is transparent at least in the region of the LED light source.
  • a covering device serves to protect against environmental influences.
  • Said cover means may be thermally conductively connected to the peripheral wall portion of the housing member, so that the cover means forms a heat sink for the waste heat of the LED light source.
  • the distance between the light-emitting diodes of the LED light source and the covering device is at least 10 mm, in particular at least 15 mm. This ensures that sufficient air circulation can form within the housing in order to convectively dissipate waste heat from the LEDs and to transfer them to different housing areas and thus to ensure even heat distribution.
  • Said cover means may be pivotally hinged to the housing member to allow easy access to the housing interior (for example, for maintenance purposes).
  • the said LED light source preferably has an electrical insulating layer on the rear side in order to produce a planar mechanical one To allow connection with the mounting portion of the typically metallic housing element.
  • the LED light source may be screwed, riveted or glued to the mounting portion of the housing member, in particular using a thermally conductive adhesive.
  • the housing member may have on its underside at least two separate mounting portions for a respective module of the LED light source, the mounting portions extending along different planes (i.e., at different heights) or inclined relative to each other (i.e., at an angle other than 180 °).
  • the said modules of the LED light source have, for example, a substantially square outline in order to allow a single or a multiple arrangement in different directions.
  • the modules mentioned it is also possible for the modules mentioned to have, for example, a rectangular, a round or a hexagonal shape.
  • a variation of the orientation ie a module of the light source with a specific X / Y characteristic can optionally also be fastened to the mounting section of the housing element in an orientation rotated by 90 °.
  • This also allows the lighting unit - with otherwise unchanged structure - easily be adapted to different applications or customer requirements.
  • any intermediate positions possible ie angles other than 90 °), in particular if the said modules of the LED light source are round or hexagonal.
  • the surface of the mounting portion of the housing member has, according to another embodiment, a lower roughness than the surface of the cooling portion. While increased roughness on the surface of the cooling portion may contribute to improved heat transfer from the housing member to the environment, relatively low roughness of the surface of the mounting portion results in better heat transfer from the LED light source to the mounting portion of the housing member.
  • the LED light source preferably comprises a carrier device, to which the plurality of light-emitting diodes are attached in an electrically conductive and heat-conducting manner, wherein a rear side of this carrier device is arranged flat and in heat-conducting connection to the mounting portion of the housing element.
  • said support means is formed at least along a layer of heat conduction in order to distribute the heat generated by the light emitting diodes flat along the support means and to transmit from the support means also flat on the mounting portion of the housing member. Unwanted so-called "hot spots", which could adversely affect the performance of the LEDs, thereby effectively avoided.
  • Said circumferential wall section on the underside of the housing element may surround a mounting volume in which the LED light source is arranged together with an associated reflector device.
  • the LED light source has a plurality of reflector elements which are arranged between the plurality of light-emitting diodes and connected to the light-emitting diodes in a heat-conducting manner.
  • the reflector elements are in this case on the side facing away from the mounting portion of the housing member side, i. in the position of use of the lighting unit, the reflector elements facing down.
  • the reflector elements serve primarily as reflector elements to distribute the light emitted by the light emitting diodes according to a desired radiation angle characteristic.
  • the reflector elements provide for improved heat distribution and are effective as a further cooling device by taking a part of the waste heat of the LEDs and deliver it to the interior of the housing.
  • the distance between a covering device of the housing or the already mentioned underside covering device on the one hand and said reflector elements on the other hand is at least 5 mm.
  • sufficient air circulation is ensured in the interior of the housing to distribute absorbed by the reflector elements waste heat.
  • the LED light source is also cooled by air flow (i.e., convective) rather than by heat conduction at the rear over the mounting portion of the housing member.
  • each of the said reflector elements has an edge which is inclined with respect to a surface normal to the plane of the two-dimensional arrangement of the light-emitting diodes and which is arranged in a longitudinal section parallel to this arrangement plane in a straight line. It has been found that this is a particularly suitable for outdoor lighting units radiation angle characteristic can be realized, the characteristic is adjustable by selecting the inclination angle.
  • the reflector elements can be web-shaped and have a substantially trapezoidal or triangular cross section, wherein the aforementioned flanks can also be concavely curved in cross section.
  • the reflector elements have a particularly simple structure in order to simultaneously fulfill a cooling function and to effect a desired radiation angle characteristic which is selected, for example, as a function of the installation altitude of the exterior lighting unit.
  • said reflector elements are formed separately from each other and also separately from said support means of the LED light source. This results in a modular design with adjustable radiation angle also with regard to the LED light source.
  • the exterior lighting unit has at least one separate from the LED light source electronic or electrical component, such as a transformer and / or a control unit, which is thermally conductively connected to an associated mounting portion of the housing member.
  • This connection can be realized, for example, via a flat contact or via fastening pins (so-called domes).
  • the said attachment portion is arranged on the underside of the housing member between the mounting portion (for the LED light source) on the one hand and the explained holding portion (for the attachment of the lighting unit to a holding device) on the other hand, so that generated by the component Heat is also transmitted effectively to the associated holding device.
  • said electronic or electrical component which generates a particularly high heat output, is arranged adjacent to the holding section of the housing element, so that the waste heat can be effectively delivered to the associated holding device.
  • the housing element is increased in the area of said fastening section (for the electrical or electronic component) relative to the mounting section for the LED light source and / or has a greater material thickness. In this way, a higher mechanical stability can be achieved in the region of said fastening section, in particular if it is arranged between said mounting section and the holding section of the housing element, and the higher material input can also lead to a better heat distribution.
  • the lighting unit is used for lighting roads, footpaths, industrial Outdoor facilities and the like.
  • the lighting unit has an LED light source 11 and a housing 13.
  • the housing 13 comprises a single one-piece housing element 15, which is solid, ie substantially without cavities (apart from openings for a mechanical or electrical connection).
  • the housing element 15 is formed as a casting of a seawater-resistant and thus weather-resistant aluminum alloy without additional surface treatment at the top, for example, AlMg4,5Mn.
  • the housing 13 further comprises a covering device 17 in the form of a plate, which is pivotally connected to the housing element 15 by means of two hinges 19 and is designed to be transparent in the region of the LED light source 11.
  • the cover 17 is by means of unspecified fixing in the in Fig. 2 to 4 shown closed position fixable.
  • the LED light source 11 has a plurality of light-emitting diodes 21 in a two-dimensional arrangement, namely in an arrangement of several rows 23. Further, the LED light source 11 comprises a plurality of web-shaped reflector elements 25, each reflector element 25 between two rows 23 of light emitting diodes 21 arranged or adjacent to an outermost row 23 of light-emitting diodes 21 is arranged (see, in particular Fig. 3 ).
  • the LEDs 21 are attached to a planar support means 27 electrically conductive and thermally conductive.
  • the reflector elements 25 are attached to the support means 27 thermally conductive.
  • the LED light source 11 may comprise a plurality of modules 29, each module 29 having its own carrier device 27 with light-emitting diodes 21 and reflector elements 25 arranged thereon. In Fig. 2 and 3 two such modules 29 are shown. In Fig. 4 a single module 29 is shown.
  • the housing member 15 includes a plurality of portions integrally formed on the housing member 15 and fulfilling different functions.
  • a planar, substantially "+" - shaped mounting portion 31 is provided, on which the back of the support means 27 of the LED light source 11 is attached flat and in heat-conductive connection (for example, screwed, riveted or glued).
  • the housing member 15 further includes on the underside a peripheral wall portion 33 which cantilevers downward from the plane of extent of said mounting portion 31, i. the wall portion 33 projects downwardly with respect to the plane of the mounting portion 31.
  • the wall section 31 surrounds a mounting volume 35 of the housing element 15, in which the LED light source 11 including the reflector elements 25 is arranged.
  • the housing member 15 further includes at the top an exposed cooling portion 37 which is convexly curved (for example, with respect to the plane of extent of the mounting portion 31) and has a plurality of cooling channels 39 extending along the convex curvature. Further, the housing member 15 has a holding portion 41 which cooperates with a hinge member 43 of an associated holding means 45 (e.g., mast) so that the lighting unit can be fastened to the holding means 45 in a cantilevered manner. Starting from the holding section 41, the housing element 15 extends along a longitudinal direction X. The said cooling channels 39 extend substantially perpendicular to this longitudinal direction X, i. along a transverse direction Y.
  • the housing member 15 further has a mounting portion 47 (see. Fig. 5 and 6 ).
  • an electrical component 49 eg power supply
  • a heat-conducting connection see. Fig. 2 to 4 ).
  • a particular advantage of the external lighting unit shown consists in the one-piece massive design of the housing member 15 with the sections 31, 33, 37, 41 and 47. In this way, namely the entire and single housing element 15 with optimal heat transfer as a heat sink for the LED light source 11th serve. Since the covering device 17 rests against the underside of the circumferential wall section 33 and is thus connected in a heat-conducting manner to the wall section 33, the covering device 17 can serve as an additional heat sink for the waste heat of the LED light source 11. Heat can also be delivered to the associated holding device 45 via the holding section 41.
  • the housing member 15 Due to the downwardly projecting circumferential wall portion 33, the housing member 15 further has a bell shape, wherein the LED light source 11 is provided with respect to the bottom of the wall portion 33 in an elevated arrangement, so that the LED light source 11 is particularly effectively protected from environmental influences.
  • the voltage applied to the underside of the peripheral wall portion 33 plate-shaped cover 17 provides a simple structure for effective protection of the interior of the housing member 15 from environmental influences.
  • cooling channels 39 By forming the cooling channels 39 on the convexly curved cooling section 37, not only an enlargement of the surface is achieved, but the heating of the ambient air at the top of the housing member 15 causes an increase of the heated air, wherein cooler air along the extending also in the vertical direction cooling channels 39 can flow continuously. As a result, substantially the entire surface of the upper-side cooling section 37 is utilized for effective heat transfer to the ambient air. It is important here that the width of the cooling channels 39 (based on half of their depth) is at least 2.5 times as large as the width of ribs 51 (relative to half the height of the ribs) which are located on the cooling section 37 between the Cooling channels 39 are formed.
  • cooling channels 39 with such width ratios is also of particular advantage in terms of stability against wind loads acting along the longitudinal sides of the housing 13. Due to the wide cooling channels 39 results namely (despite the longitudinal shape of the housing 13) along the transverse direction Y only a small air resistance.
  • the wide cooling channels 39 help to effectively remove the precipitate from the top of the housing 13 to form a self-cleaning effect.
  • the reflector elements 25 are thermally conductively connected to the light emitting diodes 21 (directly or via the carrier device 27).
  • the reflector elements 25 thus serve as additional cooling device.
  • the interior of the housing 13 has a large clearance.
  • a sufficient distance between the light emitting diodes 21 or the reflector elements 25 on the one hand and the top of the cover 17 on the other hand provided to allow the formation of air circulation in the interior of the housing 13.
  • the distance between the bottom (ie, the top) of the reflector elements 25 and the cover 17 at least 5 mm.
  • the waste heat generated by the electrical component 49 can be used so that the LED light source 11 reaches its predetermined thermal operating point quickly after switching ,
  • a particular advantage is with regard to the interaction of the modules 29 of the LED light source 11 with the associated mounting portion 31 of the housing member 15.
  • the substantially square modules 29 have due to the web-shaped reflector elements 25 namely an anisotropic Abstrahlwinkel characterizing, ie along a first direction is significantly more light emitted as along a second direction perpendicular thereto.
  • the modules 29 can be fastened in different angular positions on the mounting section 31 (ie the reflector elements 25 run parallel or perpendicular to the longitudinal direction X).
  • either a single module 29 or a plurality of modules 29 can be attached in a longitudinal arrangement or in a transverse arrangement to the "+" - shaped mounting portion 31 (ie side by side along the longitudinal direction X or side by side along the transverse direction Y).
  • these parameters angular position, arrangement direction
  • the radiation angle characteristic of the lighting unit in a simple manner to different applications or customer requirements.
  • Fig. 8 shows that the light-emitting diodes 21 are attached to the carrier device 27 according to a two-dimensional grid (for example, soldered, bonded or adhesively bonded).
  • the light-emitting diodes 21 are in this case arranged in a plurality of rows 23, wherein between two adjacent rows 23, a respective web-shaped reflector element 25 is fixed to the support means 27 (eg screwed).
  • Each reflector element 25 is thus effective for a plurality of LEDs 21 as a reflector.
  • the light-emitting diodes 21 typically emit visible light having a substantially white emission spectrum at a nominal emission angle of approximately 120 °. These are light-emitting diodes 21 with high luminous flux in order to be able to illuminate large areas.
  • the carrier device 27 is a printed circuit board or another type of carrier plate having a plurality of metallic interconnects 61 and a plurality of connection surfaces (ie, solder surfaces) 63.
  • the carrier device 27 has a heat-conducting surface in order to distribute the heat generated by the light-emitting diodes 21 in a planar manner along the carrier device 27 and from the carrier device 27 flat on the mounting portion 31 of the housing member 15 (FIGS. Fig. 1 to 7 ) transferred to.
  • the conductor tracks 61 together with the connection surfaces 63 form a partially interrupted heat-conducting layer 62 on the front side of the carrier device 27.
  • Additional heat-conducting layers can also be provided within the carrier device 27.
  • the metallic interconnects 61 are largely covered with a front thin insulating layer 64.
  • the insulating layer 64 effects electrical insulation and at the same time enables effective thermal coupling of the reflector elements 25 via the said heat-conducting layer 62 (ie via the conductor tracks 61) with the rear side of the light-emitting diodes 21, so that the reflector elements 25 serve as a cooling device for the light-emitting diodes 21.
  • the light emitting diodes 21 partially sit on the tracks 61, and the reflector elements 25 overlap (via said insulating layer 64) with lateral areas of the tracks 61.
  • the carrier device 27 of the LED light source 11 has an electrical insulating layer 65 to a reliable to cause electrical insulation of the mounting portion 31 of the housing member 15.
  • the reflector elements 25 have a trapezoidal cross-section, wherein the reflector elements 25 are tapered with increasing distance from the carrier device 27, ie along a surface normal of the carrier device 27.
  • Each reflector element 25 has along its two longitudinal sides a respective edge 67, which forms the actual reflector surface.
  • These flanks 67 are inclined with respect to the surface normal of the support means 27 by a predetermined inclination angle.
  • Out Fig. 8 It can be seen that the flanks 67 are formed in a longitudinal section parallel to the plane of extension of the support means 27 rectilinear.
  • the LED light source 11 Since the reflector elements 25 are formed separately from the support means 27, the LED light source 11 has a modular construction. This makes it possible to optionally equip a respective LED light source with one of a plurality of different sets of reflector elements 25, which differ in particular with regard to the said angle of inclination of the flanks 67. In this way, an additional adaptation of the outdoor lighting unit to different applications or customer requests can take place.
  • the LED light source 11 may be formed without separate lenses. It is sufficient a simple transparent cover (cover 17) as protection against contamination.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
EP10717521.8A 2009-04-03 2010-03-30 Aussenraum-beleuchtungseinheit Active EP2401543B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009016256A DE102009016256A1 (de) 2009-04-03 2009-04-03 Außenraum-Beleuchtungseinheit
PCT/EP2010/002031 WO2010112205A1 (de) 2009-04-03 2010-03-30 Aussenraum-beleuchtungseinheit

Publications (2)

Publication Number Publication Date
EP2401543A1 EP2401543A1 (de) 2012-01-04
EP2401543B1 true EP2401543B1 (de) 2015-03-18

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US (1) US20120026737A1 (ru)
EP (1) EP2401543B1 (ru)
DE (1) DE102009016256A1 (ru)
RU (1) RU2539363C2 (ru)
WO (1) WO2010112205A1 (ru)

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Publication number Publication date
US20120026737A1 (en) 2012-02-02
DE102009016256A1 (de) 2010-10-14
RU2539363C2 (ru) 2015-01-20
RU2011144508A (ru) 2013-05-10
WO2010112205A1 (de) 2010-10-07
EP2401543A1 (de) 2012-01-04

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