EP2384410A1 - Unité d'éclairage - Google Patents

Unité d'éclairage

Info

Publication number
EP2384410A1
EP2384410A1 EP10701631A EP10701631A EP2384410A1 EP 2384410 A1 EP2384410 A1 EP 2384410A1 EP 10701631 A EP10701631 A EP 10701631A EP 10701631 A EP10701631 A EP 10701631A EP 2384410 A1 EP2384410 A1 EP 2384410A1
Authority
EP
European Patent Office
Prior art keywords
lighting unit
unit according
emitting diodes
light
reflector elements
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.)
Withdrawn
Application number
EP10701631A
Other languages
German (de)
English (en)
Inventor
Mustafa Dinc
Harald Lunt
Franz X. Rettenmeier
Jörg ANGERSTEIN
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 EP2384410A1 publication Critical patent/EP2384410A1/fr
Withdrawn legal-status Critical Current

Links

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
    • F21K9/20—Light sources comprising attachment means
    • 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
    • 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
    • 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
    • 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
    • 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
    • F21V17/12—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 by screwing
    • 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
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
    • F21V23/04—Arrangement of electric circuit elements in or on lighting devices the elements being switches
    • F21V23/0435—Arrangement of electric circuit elements in or on lighting devices the elements being switches activated by remote control means
    • 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
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
    • F21V23/04—Arrangement of electric circuit elements in or on lighting devices the elements being switches
    • F21V23/0442—Arrangement of electric circuit elements in or on lighting devices the elements being switches activated by means of a sensor, e.g. motion or photodetectors
    • 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
    • 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 a lighting unit for illuminating large areas, with a carrier device to which a plurality of light-emitting diodes are attached in a two-dimensional arrangement.
  • Such a lighting unit is typically used to illuminate outdoor areas (e.g., streets, car parks, walkways, sports fields) or building interiors (e.g., industrial buildings, car parks, shopping malls, railway stations, airports).
  • outdoor areas e.g., streets, car parks, walkways, sports fields
  • building interiors e.g., industrial buildings, car parks, shopping malls, railway stations, airports.
  • LEDs allows a reduction in energy consumption, for example, compared to conventional sodium lamps, mercury lamps, light bulbs or fluorescent tubes.
  • the illumination unit has a carrier device to which a plurality of light emitting diodes are attached in a two-dimensional arrangement to form a so-called array.
  • the light-emitting diodes are arranged, for example, in a plurality of rows which extend along a respective longitudinal direction. These rows are in the transverse direction, that is perpendicular to the said longitudinal direction, adjacent to each other.
  • the light-emitting diodes thereby form a rectangular matrix.
  • the light-emitting diodes may be arranged, for example, according to a grid with a round outline, in a plurality of concentric rings, according to a triangle or according to another polygon (eg hexagon). In each case, a flat lighting unit is formed in order to illuminate large areas can.
  • the light-emitting diodes can emit white light (for example with the aid of wavelength-modifying substances).
  • an arbitrary emission spectrum is possible, whereby non-visible emission spectra are also possible (eg infrared radiation) and where also different colored emission spectra can be combined (eg a group of red light emitting diodes, a group of green light emitting diodes and a group of blue light emitting diodes).
  • light emitting diodes are used with a high luminous flux ("high brightness").
  • the reflector elements are attached to the support means.
  • the reflector elements preferably have a longitudinal shape and form a partition wall between at least two adjacent light-emitting diodes.
  • the reflector elements are thus associated with a plurality of light-emitting diodes, i.
  • Each reflector element is effective for a plurality of LEDs as a reflector.
  • the respective reflector element preferably extends laterally with respect to the associated light-emitting diodes without enclosing the light-emitting diodes circumferentially (for example in a funnel shape).
  • the reflector elements are formed separately from one another and also separately from the carrier device and separately from the light-emitting diodes.
  • reflector structures are formed for the areal distribution of the light-emitting diodes, which extend between the light-emitting diodes.
  • the reflector of the illumination unit thus has a particularly fold and robust construction. There are no separate lenses of the lighting unit required, ie no lenses in addition to any integrated lenses of the LEDs themselves. Furthermore, no filler in the space between adjacent reflector elements is mandatory.
  • the lighting unit can be easily adapted to different applications or customer requirements.
  • a suitable tilt angle of the reflector elements can be selected based on a calculation formula or a data sheet.
  • such reflector elements are fastened to the carrier device whose angle of inclination causes the radiation characteristic suitable for a certain installation height.
  • the number of reflector elements per carrier device, the arrangement of the reflector elements on the carrier device, the shape of the reflector elements and / or their length can be selected accordingly.
  • Such an adaptation of the lighting unit is particularly advantageous, for example, for street lighting, since street lighting units are not mounted at a uniform height.
  • lighting units of the type described can be arranged side by side in one direction or in two mutually perpendicular directions in order to increase the area along which the light emitting diodes are arranged, thereby increasing the radiation flux (light output) ) increase.
  • a two-dimensional arrangement be provided by a plurality of lighting units in the manner of a mosaic.
  • the radiation characteristic can be tuned particularly accurately to a desired application. Since the reflector elements are arranged between the light emitting diodes, without a respective reflector element necessarily enclosing the light emitting diodes circumferentially, the attachment of the reflector elements to the carrier device can take place within advantageously large tolerances, without this having a noticeable effect on the emission characteristic. Thus, despite the additional fastening steps (for the multiple separate reflector elements) cost-effective production of the lighting unit possible.
  • the reflector elements are elongated, for example as a reflector webs.
  • the respective reflector element can be effective at the same time for a large number of light-emitting diodes in a simple manner, namely for the light-emitting diodes arranged on the two longitudinal sides of the respective reflector element.
  • the reflector elements have a rectilinear shape to allow a simple arrangement between two rectilinear rows of light-emitting diodes.
  • the reflector elements may have a curved shape (eg C- or S-shaped) or an angular shape (eg L- or Z-shaped).
  • a meandering shape is possible, for example, a serpentine shape or a zigzag shape.
  • the reflector elements taper in cross-section (ie in a plane perpendicular to the support means and perpendicular to the longitudinal extension direction of the respective reflector element) with increasing distance from the support plate. In this way, a desired radiation characteristic of the lighting unit can be specified.
  • the reflector elements may, for example, be trapezoidal or wedge-shaped in cross-section (i.e., in a plane perpendicular to the support means and perpendicular to the longitudinal extension direction of the respective reflector element).
  • the reflector elements for the two adjacent rows of LEDs can fulfill an indicative function.
  • the reflector elements may have flanks on two longitudinal sides which are facing adjacent light-emitting diodes, which flanks are inclined with respect to a surface normal of the carrier device by the already mentioned inclination angle.
  • the said flanks of the reflector elements may extend continuously in a straight line or continuous concave with respect to a longitudinal section plane running parallel to the support device and in particular with respect to a longitudinal extension direction of the respective reflector element.
  • the reflector elements it is also possible, for example, for the reflector elements to be designed in the longitudinal direction with a number of indentations corresponding to the number of neighboring light-emitting diodes. are formed. As a result, therefore, a section of a single reflector is formed for each light emitting diode.
  • the reflector elements are screwed to the carrier device.
  • the reflector elements it is possible, for example, for the reflector elements to be riveted, glued, soldered, welded or fixed by a press fit to the carrier device.
  • At least some of the light-emitting diodes are arranged in a plurality of rows, wherein the said separate reflector elements are fastened between the rows of light-emitting diodes on the carrier device and run substantially parallel to the said rows of light-emitting diodes.
  • the respective reflector element can be effective for the two adjacent rows of LEDs, while at the same time a simple change of the emission characteristic is possible by exchanging the reflector element.
  • At least one reflector element is secured to the support means between each pair of adjacent rows of light emitting diodes.
  • this is not absolutely necessary (depending on the desired radiation characteristic).
  • some gaps between adjacent light emitting diodes or between adjacent rows of light emitting diodes may also remain free of reflector elements.
  • light-emitting diodes with a high luminous flux are preferably used.
  • the said reflector elements are at the same time effective as a cooling device in the manner of cooling fins.
  • the reflector elements on the Carrier device with the light-emitting diodes are thermally conductively connected.
  • the reflector elements may be formed of metal, for example made of aluminum (glossy or matt), optionally a transparent protective layer may be provided.
  • a transparent protective layer may be provided.
  • the desired thermal conduction properties are particularly effectively associated with suitable reflective properties.
  • the reflector elements can be formed, for example, from a metal-coated plastic, for example from an aluminum-coated plastic.
  • a heat sink may be arranged on the side of the carrier device facing away from the light emitting diodes, or the carrier device itself forms a heat sink.
  • the reflector elements are designed to be diffusely reflecting, wherein the light-emitting diodes are preferably arranged outside the focal point of the reflector elements.
  • the reflector elements thus cause a simple construction only a limitation of the emission angle of the LEDs in a direction perpendicular to the extension direction of the respective reflector element, but no focusing.
  • the lighting unit is therefore particularly well suited for illuminating large areas with an inhomogeneous angle characteristic in the X / Y direction, as is desirable in particular for street lighting.
  • Such a diffuse reflective design can be achieved, for example, by using matt aluminum as a reflector material.
  • the carrier device preferably has at least one layer of metal, wherein the Reflector elements with the metal layer directly or via a heat-conducting insulating layer (ie, a heat-conducting, but electrically insulating layer) are connected.
  • the metal layer consists for example of copper, a copper alloy, aluminum or an aluminum alloy.
  • said metal layer is arranged on that side of the carrier device to which the light-emitting diodes are fastened, wherein said insulating layer is largely transparent to the radiation emitted by the light-emitting diodes in order to be effective as a supplementary reflector at the same time.
  • the carrier device is, for example, a flexible or rigid printed circuit board, with a flexible or rigid carrier made of plastic, metal or ceramic (eg foil or sheet metal) and with conductor tracks, which are electrically connected to the light emitting diodes, to the light emitting diodes with electrical energy to supply.
  • a flexible or rigid carrier made of plastic, metal or ceramic (eg foil or sheet metal) and with conductor tracks, which are electrically connected to the light emitting diodes, to the light emitting diodes with electrical energy to supply.
  • the aforementioned metal layer can simultaneously form an electrical conductor track.
  • a particularly simple connection of the light-emitting diodes results here when several of the light-emitting diodes are electrically connected in series.
  • the LEDs may be connected in parallel, or the LEDs are individually controlled.
  • the lighting unit has a light sensor which measures the brightness of the ambient light.
  • an evaluation device is provided, which is designed to control the power supply of the light-emitting diodes in dependence on the measured value of the light sensor.
  • the evaluation device may select a suitable value from a look-up table of the electrical supply current as a function of the measured value of the light sensor and, for example, from the time or read from an externally supplied control signal. It can also be a simple target / actual comparison performed.
  • the energy requirement can be considerably reduced by a demand-dependent supply of the light-emitting diodes.
  • the said light sensor has a spectral sensitivity which is adapted to the spectral sensitivity of the human eye. This ensures namely that the detection of the brightness of the ambient light is modeled on the perception of the human eye, and it is avoided that the evaluation device due to an inappropriate spectral sensitivity of the light sensor, an excessive power supply of the light-emitting diodes, i. an unnecessarily high brightness.
  • the spectral sensitivity of the human eye ranges from about 380 nm to about 780 nm, while the spectral sensitivity of a typical photosensitive
  • Element extends far into the infrared (e.g., maximum at about 900 nm for silicon-based photoelements or maximum at about 1500 nm for germanium-based photoelements).
  • the light sensor may comprise a combination of a photosensitive element (e.g., photodiode, phototransistor) with an optical filter (e.g., bandpass filter, edge tapper).
  • a photosensitive element e.g., photodiode, phototransistor
  • an optical filter e.g., bandpass filter, edge tapper
  • the spectral sensitivity of the light sensor to the spectral sensitivity of the Is adapted to night vision of the human eye (so-called scotopic vision), which generally lies at shorter wavelengths than the spectral sensitivity of the daytime vision of the human eye (so-called photopic vision).
  • the spectral sensitivity of the light sensor can range from about 400 nm to about 620 nm with a maximum at about 510 nm.
  • the light sensor is advantageous for the light sensor to be arranged at an end face or rear side of the illumination unit pointing away from the emission angle of the light emitting diodes. With reference to the position of use of the lighting unit, this is typically the top of the lighting unit. This avoids unwanted optical feedback with the light emitted by the illumination unit.
  • the illumination unit may have a radio receiver and an evaluation device.
  • the radio receiver can receive a control signal from a higher-level control unit or from an adjacently installed lighting unit via radio, which is evaluated by the evaluation device in order to control the energy supply of the light-emitting diodes in dependence on the received control signal.
  • This control can include simple switching on or off or dimming of the LEDs.
  • the lighting unit can have a radio transmitter, so that the lighting unit can communicate bidirectionally with a higher-level control unit or an adjacently installed lighting unit.
  • a plurality of adjacent lighting units can thereby form a communications chain in order to provide a large bandwidth for a low range of the radio signals Number of lighting units to detect by radio.
  • the evaluation device is preferably designed to transmit status data and / or environment data by means of the radio transmitter.
  • the status data mentioned include, for example, information about the functionality of the lighting unit in question, the power consumption of the lighting unit concerned, the functionality of the light emitting diodes of the lighting unit concerned, and / or the functionality of another lighting unit (from which a corresponding status signal has previously been received by radio).
  • the environmental data mentioned include, for example, a measured value of a light sensor connected to the evaluation device, a measured value of a temperature sensor connected to the evaluation device, and / or a measured value previously received by radio.
  • the energy requirement can be significantly reduced by a demand-dependent supply of LEDs.
  • the invention also generally relates to a lighting unit with a plurality of light-emitting diodes, in which regardless of the arrangement of the LEDs and regardless of the presence or the design of a reflector, a light sensor and an evaluation or a radio receiver and an evaluation device are provided to in the above Way to control the power supply of the LEDs.
  • the invention also relates to a lighting device with a plurality of lighting units of the type described, which are designed as a modular system in one direction or in two mutually perpendicular directions. are arranged side by side.
  • the illumination device can be easily adapted to a desired radiation flux (light output).
  • the invention also relates to a lighting unit module system having at least one lighting unit of the type described above, wherein the modular system comprises at least one type of support means (with a predetermined or selectable arrangement of light-emitting diodes) and different sets of reflector elements, optionally on the Carrier device can be fastened in order to adapt the lighting unit in question to a desired application or to set a desired radiation characteristic.
  • the reflector elements of the different sets (and thus the reflector elements of different lighting units) differ in such a modular system with respect to at least one of the following features: respective inclination angle with respect to a surface normal of the support device, shape, length,
  • Number of reflector elements per support means, and / or arrangement of the reflector elements on the support means e.g., placing a reflector element between each row of light emitting diodes or only between every other row).
  • the emission characteristic can be set particularly accurately, for example by varying the number of reflector elements per carrier device or by attaching reflector elements with different tilt angles on a (single) carrier device.
  • a modular system can also comprise several different types of carrier devices (eg different size).
  • Fig. 1 shows a lighting unit in a perspective view.
  • Fig. 2 shows an unpopulated carrier device in a perspective view.
  • Fig. 3 shows a reflector element in a perspective view.
  • FIGS. 4a to 4d show a respective cross section of different reflector elements.
  • Fig. 5 shows a longitudinal section of a reflector element.
  • Figs. 6a and 6b show circuits for brightness control.
  • FIG. 1 shows a lighting unit with a carrier device 11, to which a plurality of light-emitting diodes 13 are fastened (for example soldered, bonded or adhesively bonded).
  • the LEDs 13 are in several
  • the light-emitting diodes 13 typically emit visible light with a substantially white emission spectrum or infrared radiation at a nominal emission angle of approximately 120 °.
  • the light-emitting diodes 13 may, for example, be based on at least one InGaN layer. These are light-emitting diodes 13 with high luminous flux in order to be able to illuminate large areas.
  • the carrier device 11 according to FIG. 1 is also shown in FIG. 2.
  • the support plate 11 is flat. It is a circuit board with a plurality of metallic interconnects 19, 21, 23 and a plurality of pads (ie, solder pads) 25, 27, 29, 31.
  • the track 19 is connected at one end to the pad 25, which serves as a positive supply connection , At the other end, the conductor 19 is connected to the connection surfaces 27, which serve for contacting the respective anode of the lower in Fig. 2 LEDs.
  • the conductor tracks 21 connect the respective connection surface 29 of each row 15, which serves as a negative supply connection, with the connection surface 31, which serves to make contact with the respective cathode of the upper light-emitting diodes in FIG.
  • the tracks 23 connect the respective pad 27 (for the anode of the relevant light emitting diode) with the respective pad 31 (for the cathode of the adjacent light emitting diode of the same row 15).
  • the aforementioned polarities can also be reversed. From FIG. 2 it can be seen that the light-emitting diodes of a row 15 are electrically connected in series (between the connection surface 25 or the conductor 19 on the one hand and the respective connection surface 29 or the respective conductor 21 on the other).
  • the printed conductors 19, 21, 23 and the connecting surfaces 25, 27, 29, 31 form a partially interrupted metal layer 32 of the carrier device 11, which is arranged on the upper side of the carrier device 11 shown in FIG.
  • This metal layer 32 has with respect to the emission spectrum of the light emitting diodes 13 reflective properties and is mostly (namely with the exception of the pads 25, 27, 29, 31) covered with an insulating layer 34, which should be as transparent as possible with respect to the emission spectrum of the LEDs 13.
  • the insulation layer 34 effects electrical insulation.
  • the reflector elements 17 allows a thermal coupling of the reflector elements 17 via the metal layer 32 with the light emitting diodes 13, so that not only the metal layer 32 forms a heat sink, but also the (at the top of the support means 11 exposed) reflector elements 17 as a cooling device for the LEDs 13th are effective.
  • the reflector elements overlap 17 with the lateral areas of the tracks 23.
  • the reflector elements 17 thus serve as (front) cooling fins to dissipate the heat loss of the "high brightness" LEDs 13 better.
  • the reflector elements 17 are made of solid metal in the example shown here. As a result, the described cooling function can be fulfilled particularly well.
  • One of the reflector elements 17 according to FIG. 1 is shown in FIG. 3.
  • the reflector elements 17 have a longitudinal shape and are formed integrally over their length.
  • the reflector elements 17 have a trapezoidal cross-section, with the reflector elements 17 being connected to one another. tapering distance from the carrier device 11, ie along a surface normal Z of the carrier device 11, taper.
  • Each reflector element 17 has along its two longitudinal sides a respective flank 33, which forms the actual reflector surface.
  • At the two longitudinal ends of each reflector element 17 has a mounting portion 35 with a bore 37. About the two mounting portions 35 each reflector element 17 is attached to the support means 11, namely by means of screws 38 which are guided through the respective bore 37 (see FIG .. 1) ).
  • FIG. 4 a shows a cross section of a reflector element 17 according to FIGS. 1 and 3 along a YZ plane. It can be seen from FIG. 4 a that the flanks 33 are inclined with respect to the surface normal Z of the carrier device 11 by an angle of inclination ⁇ .
  • This inclination angle ⁇ can be, for example, 10 °, 20 °, 30 °, 40 ° or 50 °.
  • Fig. 4b shows an embodiment with a larger inclination angle ⁇ .
  • sets of reflector elements 17 with different angles of inclination ⁇ of the flanks 33 can be provided, with which a respective carrier device 11 is optionally populated in order to achieve a desired predetermined emission characteristic of the lighting unit in question.
  • Fig. 4c shows a similar embodiment as Fig. 4a, wherein the cross section of the reflector element 17 here wedge-shaped, i. is triangular.
  • the flanks 33 are rectilinear in cross section.
  • the flanks 33 may be concavely curved in cross-section to achieve a modified radiation characteristic. This is shown in Fig. 4d.
  • the flanks 33 are continuous in the longitudinal direction X.
  • the flanks may be continuously concavely curved in the longitudinal direction X, corresponding to the cross section according to FIG. 4d.
  • a particularly good luminance is obtained when the height of the reflector elements 17 (extension in the Z direction) is greater than their width (extension in the Y direction), as is the case in the exemplary embodiments according to FIGS. 4a, 4c and 4d.
  • a plurality of indentations 39 are formed on the flanks 33 of the reflector elements 17, each indentation 39 being associated with an adjacent light-emitting diode 13 in order to form a reflector section for the latter.
  • the indentations 39 are thus distributed regularly in the longitudinal direction X.
  • Fig. 5 shows a longitudinal section of such a reflector element 17, wherein the sectional plane corresponds to an XY plane, i. is parallel to the plane of extension of the carrier device 11.
  • the indentations 39 extend in the viewing direction, i. along the Z direction.
  • the lighting unit described in connection with FIGS. 1 to 5 serves as exterior lighting (eg street lighting) or for illuminating large areas of a building interior.
  • This lighting unit is characterized by a simple and robust construction, since essentially only the reflector elements 17 are required as optical elements. Since the reflector elements 17 are formed separately from the carrier device 11, the illumination unit has a modular structure. This makes it possible to optionally equip a respective lighting unit with one of a plurality of different sets of reflector dements 17, which, for example, with regard to the Angle of movement ⁇ of the flanks 33 of the reflector elements 17 differ. As a result, a lighting unit which is particularly suitable for a particular application can be configured in a simple manner.
  • ⁇ angle of inclination ⁇ is best suited for a particular mounting height of the lighting unit, as a result of which the relevant set of reflector elements 17 are fixed to the support 11.
  • each row 15 comprising at least three light emitting diodes 13.
  • the light-emitting diodes for example, according to a grid with a round outline or to arrange in a plurality of concentric rings, wherein the shape of the reflector elements is basically adapted to the course of the spaces between adjacent light-emitting diodes.
  • a plurality, in particular two rows 15, of light-emitting diodes can run between two reflector elements 17.
  • the middle reflector element 17, or the second and the fourth reflector element 17 can be omitted.
  • reflector elements 17 with a plurality of different angles of inclination ⁇ can also be fastened to the support device 11.
  • FIGS. 6a and 6b Two particularly advantageous further developments of a lighting unit with a plurality of light-emitting diodes will be explained below with reference to FIGS. 6a and 6b.
  • the advantages described in this context are not limited to a lighting unit having a plurality of reflector elements 17 as shown in FIG. 1 to 5.
  • Light-emitting diodes and thus a control of the brightness of the lighting unit.
  • the 6a shows a control circuit with a light sensor 41, for example a phototransistor or a photodiode (if necessary with an amplifier).
  • the light sensor 41 is designed and arranged on the illumination unit such that the light sensor 41 makes it possible to measure the ambient light.
  • the light sensor 41 can be mounted on a front side or rear side of the illumination unit or carrier device for the illumination unit pointing away from the emission angle of the light emitting diodes. be arranged diodes of the lighting unit.
  • the output of the light sensor 41 is connected to an evaluation device 43 which evaluates a measured value of the light sensor 41 in order to control a power supply device 45, which supplies the light emitting diodes 13 of the relevant lighting unit with electrical energy.
  • the energy supply device 45 may be, for example, a controllable current source.
  • the evaluation device 43 may, according to a simple embodiment, have a comparator which compares the measured value of the light sensor 41 with a stored or otherwise preset desired value in order to control the energy supply device 45 as a function of the target / actual comparison. This ensures that, with sufficient ambient light, the lighting unit produces a reduced light output. Thus, a reduced power consumption is made possible.
  • the evaluation device 43 can be connected to a storage device 47 in which a look-up table is stored.
  • the evaluation device 43 depending on the measured value of the light sensor 41 and as a function of other parameters (such as time or day of the week) read a suitable value from the memory device 47, which is the power supply device 45 transmitted as a control signal.
  • a predetermined calculation rule can also be stored.
  • Fig. 6b shows a similar control circuit for a lighting unit with LEDs.
  • This embodiment comprises a radio receiver 51, which is adapted to receive a transmitted via radio control signal.
  • This control signal can be sent out by a central control unit for a plurality of lighting units.
  • the received signal of the radio receiver 51 is transmitted to an evaluation device 43, which comprises, for example, a microprocessor.
  • the evaluation device 43 controls a power supply device 45 for the light emitting diodes 13 of the lighting unit.
  • the evaluation device 43 according to FIG. 6b can take into account additional parameters or input signals in addition to the received signal of the radio receiver 51. In particular, a combination of the embodiments according to FIGS. 6a and 6b is also possible.
  • the evaluation device 43 can thus take into account the measured value of a light sensor 41 and additionally the received signal of a radio receiver 51 in order to control a power supply device 45 of the lighting unit on the basis of a predetermined calculation rule or a look-up table.
  • the radio receiver 51 is at the same time designed as a radio transmitter in order to form a transmitting / receiving device (so-called transceiver).
  • the evaluation device 43 is designed to control the radio transmitter / radio receiver 51 for transmitting state data and / or environmental data (for example, information about the functionality of the light-emitting diodes 13 or the measured value of a connected light sensor 41 according to FIG. 6a).

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)

Abstract

L'invention concerne une unité d'éclairage pour l'éclairage de grandes surfaces, ladite unité comprenant un dispositif support (11) sur lequel plusieurs diodes électroluminescentes (13) sont fixées selon une disposition bidimensionnelle. Plusieurs éléments réflecteurs (17) séparés sont fixés entre les diodes électroluminescentes sur le dispositif support.
EP10701631A 2009-01-27 2010-01-27 Unité d'éclairage Withdrawn EP2384410A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009006184A DE102009006184A1 (de) 2009-01-27 2009-01-27 Beleuchtungseinheit
PCT/EP2010/000488 WO2010086150A1 (fr) 2009-01-27 2010-01-27 Unité d'éclairage

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EP2384410A1 true EP2384410A1 (fr) 2011-11-09

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EP10701631A Withdrawn EP2384410A1 (fr) 2009-01-27 2010-01-27 Unité d'éclairage

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US (1) US9000346B2 (fr)
EP (1) EP2384410A1 (fr)
DE (1) DE102009006184A1 (fr)
RU (1) RU2538783C2 (fr)
WO (1) WO2010086150A1 (fr)

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JP6125308B2 (ja) * 2013-04-24 2017-05-10 本田技研工業株式会社 車両用尾灯装置
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RU2566816C2 (ru) * 2014-03-12 2015-10-27 Общество с ограниченной ответственностью "Альбатрос" Оптическая система и способ освещения поверхности
US11306896B2 (en) * 2014-05-30 2022-04-19 Abl Ip Holding Llc Integrated light engines including flexible optics and flexible light sources
KR20160001099A (ko) 2014-06-26 2016-01-06 에스케이하이닉스 주식회사 반도체 패키지
JP6547548B2 (ja) * 2014-10-31 2019-07-24 日亜化学工業株式会社 発光装置及び配光可変ヘッドランプシステム
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WO2010086150A1 (fr) 2010-08-05
RU2011135732A (ru) 2013-03-10
US9000346B2 (en) 2015-04-07
RU2538783C2 (ru) 2015-01-10
US20120018623A1 (en) 2012-01-26
DE102009006184A1 (de) 2010-07-29

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