EP2347175B1 - Module lumineux - Google Patents

Module lumineux Download PDF

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Publication number
EP2347175B1
EP2347175B1 EP09759643.1A EP09759643A EP2347175B1 EP 2347175 B1 EP2347175 B1 EP 2347175B1 EP 09759643 A EP09759643 A EP 09759643A EP 2347175 B1 EP2347175 B1 EP 2347175B1
Authority
EP
European Patent Office
Prior art keywords
heat sink
thermal resistance
module
luminous module
thermally conductive
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.)
Not-in-force
Application number
EP09759643.1A
Other languages
German (de)
English (en)
Other versions
EP2347175A1 (fr
Inventor
Steffen Block
Rainer Huber
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.)
Ams Osram International GmbH
Original Assignee
Osram Opto Semiconductors 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 Osram Opto Semiconductors GmbH filed Critical Osram Opto Semiconductors GmbH
Publication of EP2347175A1 publication Critical patent/EP2347175A1/fr
Application granted granted Critical
Publication of EP2347175B1 publication Critical patent/EP2347175B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/20—Light sources comprising attachment means
    • F21K9/23—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
    • F21K9/238—Arrangement or mounting of circuit elements integrated in the light source
    • 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
    • F21V29/85—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems characterised by the material
    • F21V29/87—Organic material, e.g. filled polymer composites; Thermo-conductive additives or coatings therefor
    • 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
    • F21V29/85—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems characterised by the material
    • F21V29/89—Metals
    • 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
    • F21V29/507—Cooling arrangements characterised by the adaptation for cooling of specific components of means for protecting lighting devices from damage, e.g. housings
    • 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
    • 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
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • a light module is specified that is suitable for large area backlighting or lighting applications.
  • billboards are used which are equipped with photo images and backlighting devices for illuminating the photographic images. If the backlighting is effected by LEDs, the junction temperatures for the different LEDs may differ.
  • the billboards are typically in an upright position. This allows the LEDs in the lower part of the billboard to give off their heat upwards. As a result, the LEDs in the middle and top areas of the billboard are exposed to a higher temperature than the LEDs in the lower area, resulting in higher junction temperatures of these LEDs.
  • different junction temperatures of the LEDs result in different brightnesses in the application and cause a color locus shift. In the long-term application, this can additionally lead to different aging behavior of the LEDs, which in turn is reflected in a Farbortverschiebung and a change in brightness.
  • an electric lighting device is described with a lighting circuit having a plurality of light emitting diodes, as well as with a lighting circuit carrier, which carries the lighting circuit and consists of a good heat conducting material.
  • a lighting circuit carrier which carries the lighting circuit and consists of a good heat conducting material.
  • For the electrical connection is within the Illuminated circuit carrier a printed circuit board with openings provided in which the LEDs are arranged so that they are in contact with the lighting circuit carrier and can be cooled.
  • supply connections are arranged in the light-emitting circuit carrier, there are no cooling vanes. However, this does not achieve a targeted change in the local thermal resistance.
  • DE 20.2006.002.797 U discloses a lighting module according to the preamble of claim 1.
  • the WO 2008/119392 A1 refers to a semiconductor light module with five LED chips, which are arranged on a carrier plate in a row.
  • integrally formed on the back of the semiconductor light module is a heat sink, which is intended to effect better heat dissipation and easier assembly of the entire semiconductor light module.
  • the heat sink may have annular structures, but also isolated cooling elements. All cooling elements in this case consist of a thermally conductive material.
  • the light-emitting diode chips are located only in the center of the semiconductor light module, so that the average thermal resistance in the local area of the cooling element in which they are arranged does not vary. Similar devices are also in the documents US 2008/0043480 . WO 2006/043379 . EP 1965128 and DE 202007009272 disclosed.
  • an object to be solved is to specify a lighting module with stable color and brightness properties.
  • the light-emitting module comprises a plurality of radiation-emitting semiconductor components, a connection carrier on which the radiation-emitting semiconductor components are arranged, and a heat sink which is connected on its front-side surface to the connection carrier and has a main body and a means arranged therefor is to change the thermal resistance of the heat sink locally, wherein the average thermal resistance of the heat sink along a main extension direction of the light-emitting module decreases.
  • the mean thermal resistance is a measure of the temperature difference that arises on average when passing through a heat flow (heat per unit time or heat output) through the heat sink along a main extension direction of the light module.
  • the light area of the light module can be divided into a lower, middle and upper area. Each area can be assigned a medium thermal resistance. According to the invention, the average thermal resistance in the lower region is higher than in the middle or upper region.
  • the light module can be described as follows:
  • the light module comprises a heat sink, which comprises a base body and a means.
  • the agent has a heat resistance that is different from the thermal resistance of the body.
  • the heat sink in the region of the means on a different thermal resistance than in the region of the body.
  • the agent can thus ensure that the heat sink no uniform heat resistance - for example, the thermal resistance of the body - has, but that the thermal resistance is varied locally.
  • the thermal resistance of the heat sink can be set with the means such that the heat sink has in places the thermal resistance of the base body and at other points the heat resistance of the heat sink deviates from the thermal resistance of the base body.
  • the heat resistance of the heat sink in the region of the agent is greater or less than the thermal resistance of the body.
  • a heat sink can be realized in which the average thermal resistance along a main extension direction of the light module changes, for example decreases.
  • the light-emitting module preferably has a flat shape, that is to say the depth of the light-emitting module is less than the length and width of the light-emitting surface of the light-emitting module.
  • the light module has two main extension directions: the first main extension direction runs parallel to the longitudinal side of the light module, the second main extension direction runs parallel to the broad side of the light module.
  • the relevant main direction of extension is, in particular, that which, when the light module is mounted upright, is opposite to the force of gravity. The main direction of extension then points from the lower to the upper area.
  • the radiation-emitting components are in the upright position of the Leuchtmöduls conventionally in the middle and upper regions of the lighting module exposed to a higher temperature than in the lower region.
  • the temperature difference between the lower area and the remaining areas can be reduced. Because by the decrease of the average heat resistance along the main extension direction, which in particular opposite to gravity, takes place in the lower area a worse heat conduction than in the middle and upper area. As a result, the temperature in the lower area increases, and the temperature difference between the lower area and the remaining areas decreases. This in turn leads to improved Farbort- and brightness characteristics of the light module and its durability.
  • the radiation-emitting semiconductor components may be unhoused semiconductor chips or compact components with semiconductor chips arranged in housings.
  • the semiconductor chips are manufactured in thin-film technology.
  • a basic principle of a thin-film light-emitting diode chip is, for example, in I. Schnitzer et al., Appl. Phys. Lett. 63 (16), 18 October 1993, 2174-2176 described, the disclosure of which is hereby incorporated by reference.
  • a thin-film light-emitting diode chip is to a good approximation a Lambert surface radiator.
  • white light is often preferred.
  • the generation of white light can firstly be realized by the use of semiconductor devices which already emit white light.
  • semiconductor components which emit differently colored light which in total yields white light.
  • red, green and blue light emitting semiconductor devices can be used, whose light is mixed.
  • a balanced temperature within the light module is particularly important. Because at higher temperatures, the brightness of red-emitting semiconductor devices decreases more than with green and blue glowing semiconductor devices. Thus, different white points are to be expected at different temperatures. In the lighting module according to the invention, this problem can be successfully prevented.
  • the connection carrier on which the radiation-emitting semiconductor components are arranged is a printed circuit board.
  • Preferred circuit boards are metal core boards (so-called MCPCBs) or substrates comprising a laminate of resin and Fiberglass fabric contained (so-called FR4) and with thermal vias, preferably Metall embromiser, are provided for improved heat conduction.
  • the connection carrier may have a thermal interface material (so-called TIM), which improves the thermal contact between the connection carrier and the heat sink.
  • the radiation-emitting semiconductor components are preferably uniformly distributed on the connection carrier. This means that the number of radiation-emitting semiconductor components per unit area is constant.
  • the semiconductor components are electrically connected to the connection carrier.
  • the main body of the heat sink may have a uniform thermal resistance.
  • the main body of the heat sink contains a metal or consists of a metal.
  • the base body may be formed of an aluminum plate.
  • the agent is distributed unevenly in the heat sink. This means that the number of elements comprising the means changes per unit area.
  • the number of elements per unit area along the main extension direction may decrease or increase.
  • By increasing or decreasing the number of elements per unit area can advantageously a Reduction of the thermal resistance of the heat sink along the main extension direction can be effected.
  • the area unit corresponds to the size of the areas. Whether the number of elements increases or decreases along the main direction of extension results, in particular, from a comparison of the number of elements in the lower region with the number of elements in the middle or upper region.
  • the means comprises thermally insulating elements, which have a greater thermal resistance than the main body of the heat sink.
  • the thermally insulating elements are arranged on or in the base body such that passing through a heat flow in the region of the elements is more difficult than other areas. As a result, the thermal resistance of the heat sink in the region of the elements is increased locally.
  • the number of thermally insulating elements per unit area decreases along the main extension direction.
  • the mean thermal resistance of the heat sink along the main extension direction decreases.
  • the lighting module on a rear surface or on at least one side surface of the heat sink on a plurality of thermally insulating elements whose number per unit area decreases along the main extension direction.
  • a plurality of thermally insulating elements may be disposed on a single side surface while on the other Side surfaces no thermally insulating elements are present.
  • the thermally insulating elements are preferably arranged in the lower region of the lighting module when the lighting module is mounted upright.
  • At least one thermally insulating element can be arranged on more than one side surface.
  • the thermally insulating elements are advantageously arranged on the side surfaces or the rear surface in such a way that they are in the lower region of the lighting module when the light module is mounted upright.
  • the thermally insulating elements are formed of a plastic material.
  • the at least one thermally insulating element may also be a recess in the main body of the heat sink, which is filled with a material having a higher heat resistance than the main body.
  • the recess extends from the front surface of the heat sink to the back surface of the heat sink.
  • the recess is filled with air.
  • a simple method for producing such a heat sink is to punch in a metal plate, preferably an aluminum plate, at least one recess.
  • the heat sink contains a plurality of recesses which are arranged in regions which are uncovered by the radiation-emitting semiconductor components.
  • the recesses are located between the semiconductor devices.
  • the semiconductor components are arranged above the base body. The heat of operation can thereby be removed well from the semiconductor devices by means of the main body.
  • the means may comprise at least one thermally conductive element which has a thermal resistance which is less than or equal to the thermal resistance of the main body.
  • the thermally conductive element or the thermally conductive elements are arranged on or in the main body, that a passage of heat flow in the region of the element or the elements with respect to other areas of the heat sink is facilitated. As a result, the thermal resistance of the heat sink in the region of the element or elements can be reduced locally.
  • the number of thermally conductive elements per unit area increases along the main extension direction.
  • the mean thermal resistance of the heat sink decreases along the main extension direction.
  • the at least one thermally conductive element may be arranged on the front-side surface, the rear-side surface or on at least one side surface of the heat sink.
  • the heat sink can protrude laterally beyond the connection carrier, so that a thermally conductive element can be arranged in the protruding region of the heat sink on its front-side surface.
  • a thermally conductive element can be arranged in the protruding region of the heat sink on its front-side surface.
  • Such a configuration is in particular for connecting the thermally conductive element with a thermally conductive Frame suitable, which surrounds the radiation-emitting semiconductor devices.
  • a frame may be provided, for example, in a billboard and enclose the photograph.
  • the heat can be dissipated from the light module via the frame.
  • the thermally conductive element is arranged such that, when the lighting module is mounted upright, it is located in the middle to upper region of the lighting module.
  • At least one thermally conductive element can be arranged on the rear surface of the heat sink. Furthermore, at least one thermally conductive element may be arranged on only one side surface or more than one side surface of the heat sink. Here, too, the at least one thermally conductive element is arranged in particular such that, when the lighting module is mounted upright, it is located in the middle to upper region of the lighting module.
  • the at least one thermally conductive element contains a metal or consists of a metal.
  • the thermally conductive element has a structured surface.
  • the surface may be structured in the form of cooling fins, so that a cooling fluid such as air can flow through the interstices of the cooling fins.
  • the means is at least partially a fastening means.
  • the lighting module can have at least one thermally insulating element which serves as a fastening element.
  • the light module at least have a thermally conductive element which serves as a fastening element.
  • the light module can be used as a light source in a lighting unit for backlighting or lighting applications.
  • the lighting unit has a housing in which the lighting module is arranged.
  • the means of the heat sink at least partially a fastening means, so that the light module can be easily attached to the housing.
  • At least a part of the housing is formed thermally conductive, that is, a part of the housing contains a material having a thermal resistance which is less than or equal to the thermal resistance of the main body of the heat sink.
  • the thermally conductive part of the housing is a metal frame that surrounds the light module.
  • the heat sink is thermally connected to the thermally conductive part of the housing. This advantageously facilitates the cooling of the lighting module.
  • the thermal connection between the heat sink and the thermally conductive part of the housing is at least partially made by the means of the heat sink.
  • the light unit may have two light modules, the heat sink facing each other.
  • connection carrier is not formed in one piece, but is composed of several sub-carriers.
  • the components of a row can each be arranged on a common sub-carrier.
  • FIG. 1 illustrated lighting module 1 has a plurality of radiation-emitting semiconductor devices 2, which are arranged on a connection carrier 3.
  • the light module 1 has a planar shape, that is, the depth of the light module 1 is smaller than the length and width of the luminous surface of the light module 1.
  • the two main directions of extension of the light module 1 are parallel to the x-direction and y-direction (see. FIG. 2 ). When the light module 1 is mounted upright, the main extension direction is the average thermal resistance decisive, which acts contrary to gravity g (cf. FIG. 2 ).
  • connection carrier 3 is a printed circuit board, for example a metal core board or a FR4-based carrier with thermal vias.
  • the outline of the connection carrier 3 is rectangular.
  • the radiation-emitting semiconductor components 2 are uniformly distributed on the connection carrier 3 and arranged at grid points of a two-dimensional grid.
  • connection carrier 3 is arranged on a heat sink 6.
  • a back surface of the terminal support 3 and a front surface of the heat sink 6 are in contact with each other.
  • a thermal interface material for improving the thermal contact between the connection carrier 3 and the heat sink 6 may be applied.
  • the heat sink 6 has a main body 4 and a means 5, which is adapted to change the thermal resistance of the heat sink 6 locally.
  • the main body 4 is in particular a metal plate which contains, for example, aluminum or consists of aluminum.
  • the means 5 comprises two thermally insulating elements 5a, which preferably contain a plastic material.
  • the two thermally insulating elements 5a are arranged on a side surface of the heat sink 6 in the lower region of the lighting module 1. They are attached to the base body 4. Due to the arrangement of the means 5 in the lower region, the means 5 is distributed unevenly in the heat sink 6. The number of thermally insulating elements 5a decreases along the main extension direction.
  • connection carrier 3 surrounds an edge of the main body 4 in the upper and middle region of the light module 1.
  • thermally insulating elements 5a protrude beyond the connection carrier 3 no further than the edge of the main body 4.
  • the main body 4 has a T-like shape ,
  • This lighting module 1 finds preferred use in a lighting unit 7 (see. FIG. 2 ), for example, a billboard, a housing with a housing frame 8 (see. FIG. 2 ), which frames the connection carrier 3 with the radiation-emitting semiconductor components 2. The edge of the base body 4 surrounding the connection carrier 3 and the thermally insulating elements 5a are then hidden behind the housing frame 8.
  • the lighting module 1 can be attached to the housing frame 8.
  • the heat sink 6 is in thermal contact with the housing frame 8.
  • the housing frame 8 contains a material with a thermal resistance which is smaller than or equal to the thermal resistance of the base body 4. This allows a good cooling of the light module 1 in the upper and middle region.
  • the light module 1 can be attached to the housing frame 8 by means of the insulating elements 5a.
  • the insulating elements 5a By the insulating elements 5a, the heat flow between the base body 4 and the housing frame 8 is reduced. This is also the case when the insulating elements 5a are omitted.
  • the light module 1 located in the lower part of a thermally insulating space between the light module 1 and the housing frame 8. The light module 1 is then attached only by the protruding edge of the base body 4 on the housing frame 8 and connected to this thermally.
  • This lighting module 1 is particularly suitable for a lighting unit in which the luminous area is smaller than the outer dimensions of the lighting unit.
  • the diagram of FIG. 2 shows the temperature distribution for the in FIG. 1
  • the prevailing at the bottom of the light module 1 temperature T u and prevailing in the upper region of the light module 1 temperature T o are approximately equal.
  • the radiation-emitting semiconductor devices 2 are exposed to temperatures that differ no more than 2 ° C from each other.
  • the light module 1 has a heat sink 6, which consists solely of the base body 4.
  • the heat sink 6 has a uniform thermal resistance.
  • the heat sink 6 covers the entire surface of the connection carrier 3.
  • the radiation-emitting components 2 in the lower region of Light module 1 give off their heat unhindered upwards.
  • the radiation emitting semiconductor devices 2 are in the in FIG. 3 Illuminator 1 shown exposed to temperatures greater than 2 ° C, namely up to 5 ° C, from each other.
  • the graphs of the FIGS. 5 and 6 show the temperature behavior of a light emitting diode, which is operated with a current of 350 mA and emits white light.
  • a corresponding temperature behavior show blue and green LEDs.
  • the graphs of the FIGS. 7 and 8 show the temperature behavior of LEDs emitting monochromatic light.
  • the LEDs are operated with a current of 400 mA.
  • the relative luminous flux ⁇ V / ⁇ V (25 ° C) which assumes the value 1.0 at 25 ° C, with increasing temperature T I in the case of a yellow-emitting light emitting diode (curve C) decreases more than in the case of red or orange light-emitting diodes (curve A, B).
  • the graphs of the FIGS. 5 to 8 illustrate the underlying problem. If the different radiation-emitting semiconductor components of a light-emitting module are exposed to very different temperatures, then their radiation properties, for example the brightness, the color locus or the dominant wavelength, can differ greatly from one another. In order to ensure a sufficient operational stability, however, lighting modules with resistant Farbund Brightness properties desired. This can be achieved in a lighting module according to the present invention by reducing the temperature fluctuations within the lighting module.
  • connection carrier 3 is arranged on a base body 4, which has a matching with the connection carrier 3 size.
  • the main body 4 is a solid body with constant density.
  • the main body 4 contains or consists of a metal and is preferably formed from a metal plate.
  • thermally insulating elements 5a are arranged, which in particular contain a plastic material. When the light module 1 is mounted upright, the thermally insulating elements 5a are located in the lower region of the light module 1.
  • the number of thermally insulating elements 5a per unit area decreases along the main extension direction.
  • the average thermal resistance is higher in the lower region than in the middle and upper regions due to the thermally insulating elements 5a.
  • the housing frame in the middle and upper area is directly connected to the base body 4, while the thermally insulating elements 5a in the lower region between the base body 4 and the housing frame are located.
  • This lighting module 1 is particularly suitable for a lighting unit in which the housing frame directly surrounds the lighting module 1, so that the lighting surface substantially corresponds to the external dimensions of the lighting unit.
  • connection carrier 3 is arranged on a base body 4, which has a matching with the connection carrier 3 size.
  • the main body 4 is a solid body with constant density.
  • the main body 4 contains or consists of a metal and is preferably formed from a metal plate.
  • the means of the heat sink 6 for local change of the thermal resistance is provided in this embodiment in the lower and upper regions of the light module 1.
  • the means comprises thermally insulating elements 5a and thermally conductive elements 5b.
  • the thermally insulating elements 5a contain a plastic material, while the thermally conductive elements 5b contain a metal.
  • the agent is distributed unevenly in the heat sink 6.
  • the number of thermally insulating elements 5a per unit area decreases along the main extension direction, while the number of thermally conductive elements 5b per unit area increases along the main extension direction. As a result, the mean thermal resistance in the main extension direction can be lowered.
  • This lighting module 1 is preferably used for a lighting unit with a covering housing frame which covers the thermally insulating elements 5a and the thermally conductive elements 5b. Particularly preferably serve the thermally insulating elements 5a and the thermally conductive elements 5b as fastening means for fixing the lighting module 1 on the housing frame.
  • FIG 11A shows a further embodiment of a lighting module 1 according to the invention.
  • the base body 4 has a matching with the connection carrier 3 size. It is not a massive body with constant density. Rather, the base body 4 recesses 9, which extend from a front surface to a rear surface of the heat sink 4.
  • Each recess 9 represents a thermally insulating element 5a.
  • the recesses 9 are filled with a material which has a higher heat resistance than the main body 4.
  • the recesses 9 are filled with air.
  • the recesses 9 can be punched into a metal plate, preferably an aluminum plate.
  • FIG. 11B shows in separate representation the connection carrier 3 of the light-emitting module 1 with the radiation emitting semiconductor components 2 arranged thereon.
  • the radiation-emitting semiconductor components 2 are uniformly distributed on the connection carrier 3.
  • FIG. 11C shows in a separate representation of the heat sink 6 of the light module 1.
  • the recesses 9 are arranged in the lower region of the heat sink 6 denser than in the middle and upper regions.
  • the number of thermally insulating elements 5a per unit area decreases along the main extension direction. In the region of the thermally insulating elements 5a, the thermal resistance becomes local elevated. However, since the number of thermally insulating elements 5a per unit area decreases along the main extension direction, the average thermal resistance also decreases.
  • the recesses 9 are arranged in areas which are uncovered by the radiation-emitting semiconductor components 2. Thus, the recesses 9 are located between the semiconductor devices 2.
  • the semiconductor devices 2 are arranged above the base body 4. The operating heat can be dissipated well by means of the main body 4 of the semiconductor devices.
  • FIG. 12 shown light module 1 has on the back surface of the heat sink 6, a thermally conductive element 5b for locally reducing the thermal resistance.
  • the number of thermally conductive elements per unit area thus increases along the main extension direction. Thereby, a decrease of the average thermal resistance along the main extension direction can be achieved.
  • the thermally conductive element 5b has a structured surface.
  • the surface of the thermally conductive element 5b may be structured in the form of cooling fins, so that a cooling fluid such as air can flow through the interspaces of the cooling fins.
  • the thermally conductive element 5b is advantageously brought into thermal contact with the thermally conductive part of the housing.
  • the heat sink 6 in contrast to the in FIG. 12 illustrated lighting module 1 not only a thermally conductive element 5b, but a plurality of thermally conductive elements 5b on the back surface.
  • the thermally conductive elements 5b are arranged in the upper region of the lighting module 1. Again, the number of thermally conductive elements per unit area increases along the main extension direction and thus the average thermal resistance.
  • illustrated lighting module 1 has a plurality of thermally conductive elements 5b. These are arranged on a front surface of the heat sink 6.
  • the main body 4 of the heat sink 6 has a greater base area than the connection carrier 3. Therefore, surrounds the connection carrier 3, which is arranged centrally on the base 4, an edge of the base body 4. In this edge region are the thermally conductive elements 5b.
  • the thermally conductive elements 5 b are arranged in the middle and upper regions of the lighting module 1. In the region of the thermally conductive elements 5b, the average thermal resistance of the heat sink 6 is reduced. As a result, since the number of the thermally conductive elements 5b per unit area increases along the main extension direction, the average thermal resistance along the main extension direction decreases.
  • this lighting module 1 is used for a lighting unit 7, for example a billboard, with a housing frame, it frames the connection carrier 3 with the radiation-emitting semiconductor components 2 and simultaneously conceals the thermally conductive elements 5b and the protruding edge of the housing body 4.
  • the lighting module 1 can be attached to the housing frame 8.
  • the heat sink 6 is in thermal contact with the housing frame.
  • the housing frame contains a material with a thermal resistance which is smaller than or equal to the thermal resistance of the base body 4. This allows a good cooling of the light module 1 in the upper and middle region.
  • the temperature compensation within the light module can be achieved most simply by enlarging the heat resistance in the lower region at the expense of a higher temperature and an associated higher junction temperature.
  • a lowering of the thermal resistance in the middle and upper range is advantageous.
  • FIG. 15 shows a perspective view of a billboard 7.
  • the billboard 7 is erected.
  • the external dimensions of the billboard are 1.10mx 2m.
  • the billboard 7 has a light image (not shown), which is bordered by a housing frame 8.
  • the light image is illuminated by a light module as described above, which is not visible in the image.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Led Device Packages (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
  • Planar Illumination Modules (AREA)

Claims (11)

  1. Module lumineux (1) comprenant :
    - une pluralité d'éléments à semi-conducteur (2) émettant un rayonnement,
    - un support de raccordement (3) sur lequel sont disposés les éléments à semi-conducteur (2) émettant un rayonnement, et
    - un corps de refroidissement (6) qui est connecté sur sa surface avant au support de raccordement (3) et qui comporte un corps de base (4) ainsi qu'un moyen (5) conçu pour modifier localement la résistance thermique du corps de refroidissement (6), dans lequel la résistance thermique moyenne du corps de refroidissement (6) diminue dans une direction d'extension principale du module lumineux (1),
    la direction d'extension principale paraît être opposée à la force de la pesanteur lorsque le module lumineux est monté de manière à être vertical, une surface lumineuse du module lumineux est divisée en des zones inférieure, médiane et supérieure, les éléments à semi-conducteur (2) émettant un rayonnement sont disposés dans les zones inférieure, médiane et supérieure de la surface lumineuse, la résistance thermique moyenne dans la zone inférieure est supérieure à sa valeur dans la zone médiane ou supérieure, caractérisé en ce que le moyen (5) comprend une pluralité d'éléments (5a) constitués d'une matière plastique et thermiquement isolants, qui présentent une résistance thermique supérieure à celle du corps de base (4) du corps de refroidissement (6).
  2. Module lumineux (1) selon la revendication 1, dans lequel les éléments à semi-conducteur (2) émettant un rayonnement sont uniformément répartis sur le support de raccordement (3).
  3. Module lumineux (1) selon la revendication 1 ou 2, dans lequel le corps de base (4) du corps de refroidissement (6) contient un métal ou est constitué d'un métal.
  4. Module lumineux (1) selon l'une quelconque des revendications précédentes, dans lequel le moyen (5) est réparti de manière non uniforme dans le corps de refroidissement (6).
  5. Module lumineux (1) selon l'une quelconque des revendications précédentes, dans lequel le nombre d'éléments thermiquement isolants (5a) par unité de surface diminue dans la direction d'extension principale.
  6. Module lumineux (1) selon l'une quelconque des revendications précédentes, comprenant, sur une surface arrière ou sur au moins une surface latérale du corps de refroidissement (6), de multiples éléments thermiquement isolants (5a) dont le nombre par unité de surface diminue dans la direction d'extension principale.
  7. Module lumineux (1) selon l'une quelconque des revendications précédentes, dans lequel le moyen (5) comprend au moins un élément thermiquement conducteur (5b) qui présente une résistance thermique inférieure ou égale à la résistance thermique du corps de base (4).
  8. Module lumineux (1) selon la revendication 7, dans lequel le nombre des éléments thermiquement conducteurs (5b) par unité de surface augmente dans la direction d'extension principale.
  9. Module lumineux (1) selon l'une quelconque des revendications 7 à 8, dans lequel l'au moins un élément thermiquement conducteur (5a) est disposé sur la surface avant, la surface arrière ou au moins une surface latérale du corps de refroidissement (6).
  10. Module lumineux (1) selon la revendication 9, dans lequel l'au moins un élément thermiquement conducteur (5b) contient un métal ou est constitué d'un métal.
  11. Module lumineux (1) selon l'une quelconque des revendications précédentes, dans lequel le moyen (5) est au moins partiellement un moyen de fixation.
EP09759643.1A 2008-10-31 2009-10-20 Module lumineux Not-in-force EP2347175B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008054233A DE102008054233A1 (de) 2008-10-31 2008-10-31 Leuchtmodul
PCT/DE2009/001463 WO2010048924A1 (fr) 2008-10-31 2009-10-20 Module d'éclairage

Publications (2)

Publication Number Publication Date
EP2347175A1 EP2347175A1 (fr) 2011-07-27
EP2347175B1 true EP2347175B1 (fr) 2015-12-16

Family

ID=41666807

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09759643.1A Not-in-force EP2347175B1 (fr) 2008-10-31 2009-10-20 Module lumineux

Country Status (7)

Country Link
US (1) US9322514B2 (fr)
EP (1) EP2347175B1 (fr)
JP (1) JP5675631B2 (fr)
KR (1) KR101662857B1 (fr)
CN (1) CN102203506B (fr)
DE (1) DE102008054233A1 (fr)
WO (1) WO2010048924A1 (fr)

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DE102014112540A1 (de) * 2014-09-01 2016-03-03 Osram Opto Semiconductors Gmbh Optoelektronisches Bauteil

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Also Published As

Publication number Publication date
KR101662857B1 (ko) 2016-10-05
WO2010048924A1 (fr) 2010-05-06
CN102203506B (zh) 2015-03-04
KR20110091705A (ko) 2011-08-12
JP2012507053A (ja) 2012-03-22
JP5675631B2 (ja) 2015-02-25
US9322514B2 (en) 2016-04-26
DE102008054233A1 (de) 2010-05-06
CN102203506A (zh) 2011-09-28
US20120092868A1 (en) 2012-04-19
EP2347175A1 (fr) 2011-07-27

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