WO2011000554A1 - Elément lumineux led et luminaire plat led - Google Patents

Elément lumineux led et luminaire plat led Download PDF

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Publication number
WO2011000554A1
WO2011000554A1 PCT/EP2010/003949 EP2010003949W WO2011000554A1 WO 2011000554 A1 WO2011000554 A1 WO 2011000554A1 EP 2010003949 W EP2010003949 W EP 2010003949W WO 2011000554 A1 WO2011000554 A1 WO 2011000554A1
Authority
WO
WIPO (PCT)
Prior art keywords
leds
led
lamp according
light
predetermined value
Prior art date
Application number
PCT/EP2010/003949
Other languages
German (de)
English (en)
Inventor
Josef Hagn
Joachim Maier
Original Assignee
Hagn_Leone 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=41693164&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2011000554(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Hagn_Leone Gmbh filed Critical Hagn_Leone Gmbh
Publication of WO2011000554A1 publication Critical patent/WO2011000554A1/fr

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
    • 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
    • F21S8/02—Lighting devices intended for fixed installation of recess-mounted type, e.g. downlighters
    • 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
    • F21S8/04—Lighting devices intended for fixed installation intended only for mounting on a ceiling or the like overhead structures
    • 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
    • F21V19/0055—Fastening of light source holders, e.g. of circuit boards or substrates holding light sources 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
    • F21V31/00—Gas-tight or water-tight arrangements
    • 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
    • F21W2131/40—Lighting for industrial, commercial, recreational or military use
    • 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 lamp with arranged on a circuit board LEDs and a flat lamp with a housing for receiving the bulb.
  • Fluorescent tubes have the disadvantage of a comparatively low color temperature, as well as a limitation of the minimum height due to the size of the fluorescent tubes.
  • LED-based machine luminaires are known, which simulate the principle of a fluorescent lamp, for example by arranging 4-8 high-power LEDs in a row.
  • LED-equipped lighting fixtures have the advantage that LEDs are usually shock-
  • punctiform light sources such a luminaire does not lead to a uniform illumination of the room and thus to disturbing glare effects and shadowing.
  • Another disadvantage is the low light intensity and the specification of the minimum height of the luminaire through the thickness of the high-power LEDs.
  • a lighting fixture based on LEDs for wet rooms is also known.
  • EP 1082426 A2 a surface radiating plate-shaped lighting unit is known, which is realized by means of a board on which light emitting diodes are arranged for light generation.
  • the flat lamp comprises a lighting means and a housing for receiving the lighting means.
  • the overall height of the flat lamp in the direction of radiation can be less than 30 mm.
  • the luminous means comprises LEDs arranged on a printed circuit board with an arrangement density of at least 1 LED per 2.5 cm 2 over an area of at least 250 cm 2 . Due to the high arrangement density according to the invention over a minimum area of 250 cm 2 , the LEDs form a luminous surface, ie a surface luminous body based on punctiform LED light sources.
  • the inventors have observed in the development of the flat lamp according to the invention the surprising effect that at an arrangement density of min. 1 LED per 2.5 cm 2 irregularities in the perceptible light distribution can be reliably avoided despite the "dot-shaped" LED light sources.
  • planar light in the sense of this invention corresponds to a light or with respect to the light distribution very close to a light that is generated by a conventional surface light body.
  • surface light body is understood in the relevant art to mean a body having a uniformly light-emitting luminous area, the thickness of which is small in comparison to the length and width dimensions.
  • the emitted light of a surface luminaire compared to the light of a filament with point light sources produces less glare and shadowing, as the light distribution distributed by the flat luminous body spatially evenly is.
  • the LED luminous element according to the invention represents a surface luminous element in this sense, since it has the same advantageous illumination properties with regard to glare effects and shadowing.
  • the luminous element according to the invention thus combines the advantageous light distribution of a surface luminous body with the advantageous properties one on LED-based filament.
  • the inventive high total number of LEDs used allows a sufficiently high light intensity.
  • the bulbs of the flats consist of individual LEDs whose forward voltage does not exceed a deviation of +/- 5% by a predetermined value. It is particularly advantageous if the variation width of the forward voltage does not exceed a value of 3.5% by a predetermined value. This is due to the surprising finding in the course of the development that brightness differences and the resulting shadowing in the luminous area can be avoided by observing previously determined tolerances in the LED forward voltage. In addition, a significantly increased lifetime of the LEDs was observed. Investigations by the inventors after realization of the invention have found that customary tolerances of the LEDs used far exceed these fluctuation ranges.
  • the predetermined value of the forward voltage is in the range 2.7-3.7 volts. A higher fluctuation range of the forward voltage, in combination with the planar arrangement density of at least 1 LED per 2.5 cm 2 according to the invention, leads to significant temperature and brightness differences, which increase further with increasing operating time of the luminaire.
  • the flat lamp has a light source with a passive LED drive.
  • the passive LED drive can be realized by resistors connected in series to the LED, thereby defining the current flow through the LEDs. This allows a very cost-effective implementation of the bulb.
  • the flat lamp can also include an active control of the individual LEDs. This has the advantage that in order to comply with small tolerances of the LED forward voltage no preselection of the LEDs used is needed, but this can be realized by an active control circuit.
  • the LEDs of the surface illuminant according to the invention are preferably selected such that the fluctuation of the color temperature of the LEDs does not exceed a value of +/- 15% by a predetermined value.
  • a predetermined value of the color temperature is in the range 6000-7500 "Kelvin.
  • the light source can comprise LEDs whose fluctuation of the intensity of the LEDs does not exceed a value of +/- 20% by a predetermined value. Particularly advantageous is a fluctuation range of less than +/- 15% by a predetermined value.
  • the fluctuation ranges of the luminous intensity of commercially available LEDs is +/- 45% by a predetermined value.
  • the predetermined value of the light intensity is in the range of 1000 - 1300 med.
  • the LEDs mounted on the surface illuminant are preferably designed as surface-mount LEDs (SMD LEDs) without an outstanding lens component
  • SMD LEDs surface-mount LEDs
  • Radial LEDs have a protruding lens portion where the emergent light is refracted, but these effects are generally imperceptible in the case of LEDs with few LEDs, but the high number of densely arranged LEDs results in dark perceptible light in the case of radial LEDs -Patches "on the surface illuminant.
  • the refraction of light on the protruding lens part also produces a warmer light with a higher proportion of yellow and red frequencies.
  • the SMD LED's emitted light which is colder compared to the use of radial LEDs, is particularly advantageous for applications in dark, oily machining areas, as these spaces better reflect cold light compared to warmer light.
  • SMD LEDs generally have two planar bearing surfaces, by means of which the LED is mounted directly on a thermally conductive surface of the circuit board, preferably provided with thermal pads, whereby the resulting heat of the LED can be derived.
  • Radial LEDs are typically mounted on a printed circuit board, with the legs of the LEDs plugged in through the printed circuit board print and soldered from the back. As a result, they can be cooled only with difficulty.
  • the low height of ⁇ 30 mm and for industrial applications often high ambient temperature (up to 45 0 C) and necessary tightness of the flat light against dust and water and the From this reduced air circulation make the thermal management even more difficult.
  • a metal-based circuit board it is advantageous to use a metal-based circuit board, as it has an improved thermal conductivity compared to conventional FR2 or FR4 circuit boards.
  • individual LEDs with a power less than 120 mW per LED are used for the luminous means according to the invention. Due to the large number of individual LEDs used produces a sufficiently high light intensity, at the same time too high heat radiation is prevented in the emission direction. LEDs with a power ⁇ 120 mW are very cost-effective and due to their compact design compared to expensive high-performance LEDs for a low-profile flat luminaire.
  • the present invention enables a low-cost flat luminaire with an LED-based surface illuminant, which produces shadow-rich, blinding and stain-poor, high-contrast light with high color temperature and luminous intensity.
  • the LED-based flat light according to the invention allows instead a variety of low-cost and relatively low-power LEDs use.
  • a surface luminous element is realized by means of individual LEDs, which avoids the otherwise usual shadowing and irregularities in the luminous area when using "punctiform" light sources (LEDs) and thus a flat light On the basis of LED technology, it meets the high requirements of industrial applications.
  • Fig. 1 shows a perspective view of an embodiment of the flat lamp according to the invention
  • Fig. 2 schematically shows a frame member having surface illuminant mounted therein and an outer cover of the flat lamp according to an embodiment of the present invention
  • FIG. 3 is an enlarged plan view of the surface illuminant according to an embodiment of the present invention.
  • FIGS. 5a-c show different views of the LEDs used.
  • Fig. 1 shows a perspective view of a flat lamp 1 in 29 inch design.
  • the flat lamp 1 comprises a frame element 10 which is made of die-cast aluminum and has a dark color for absorbing radiation of an LED-based luminous means 20.
  • a holding member 13 for mounting the flat lamp 1 is provided in a corresponding attitude.
  • the flat lamp 1 further has an outer cover 12 which extends over an outer region of the upper side and a part of the peripheral edge of the flat lamp 1 and which is screwed to the frame element 10 via screws 14.
  • An at least partially translucent cover plate 11 is fixed shock-resistant in the frame member 10 and consists for example of polycarbonate or polyacrylate or glass (tempered glass or laminated safety glass).
  • the outer dimensions of the flat lamp shown in Fig. 1 are for example 771 x 171 x 28mm with a thickness of the illuminant of 3.5 mm.
  • the flat lamp thus has a height of 28 mm in the emission direction.
  • FIG. Fig. 2 shows schematically a frame member having mounted therein
  • the frame element has a lateral angle section 41.
  • the LED illuminant 30 is located on a lower
  • the frame member 10 has a circular recess for receiving the
  • the surface illuminant 30 comprises a rectangular FR4 circuit board 32 on which 952 LEDs 31 are mounted.
  • the outer dimensions of the printed circuit board shown in FIG. 3 are 700 ⁇ 138 mm.
  • the LEDs 31 are alternately arranged in rows of 8 and 9 perpendicular to the longitudinal direction of the circuit board with the row of LEDs 8 row parallel to the row of LEDs 9, so that one row 8 LED is equidistant from the next two LEDs of the following row 9 Series has.
  • the LEDs are mounted at a distance of 1.3 cm on the circuit board, which corresponds to an arrangement density of 1 LED per 1.68 cm 2 .
  • the LEDs 31 are mounted via two contact surfaces of the LED underside by Printmontage directly to a thermally conductive surface of the circuit board, preferably provided with thermal pads attached.
  • the flat lamp according to the invention knows a max. Surface temperature in the range of 55 0 C at 25 0 C ambient temperature.
  • the LED flat light according to the invention produces a light output in the range of 27,000 Lx per dm 2 at a distance of 15 cm and has a luminous area of approximately 7.6 dm 2 .
  • each 136 resistors 33 are soldered in a line perpendicular to the LED 8 and 9 rows.
  • Resistors 33 connected in series. On two opposite corners of the
  • Printed circuit boards is soldered in each case a cable connection 34 for power supply. At two other opposite corners of the circuit boards two holes 37 are provided for fastening means to the circuit board on
  • the inventors have determined in experimental series that the inventive high arrangement density of the 952 LEDs of 1 LED per 1.68 cm 2 at market Tolerances of the LEDs with respect to the forward voltage, the color temperature and the light intensity leads to disturbing shadows and light spots. Therefore, only specially preselected LEDs are installed for the surface illuminant according to the invention in the embodiment with a passive LED control, which has a very narrow fluctuation range with respect to the forward voltage (+/- 0-1 V at a mean forward voltage of 3.1 V), the color temperature ( +/- 500 0 K by a predetermined value of 6500 0 K) and the light intensity (+/- 1.50 med at a predetermined value of 1150 med).
  • circuit board fastener 35 for mounting the circuit board on the frame member 10.
  • Some of these fasteners are pronounced as bolts, which both secure the circuit board to the frame member and serve as a spacer for resting the outer cover 12.
  • Fig. 4 shows a control circuit according to an embodiment of the invention.
  • 4 shows two LED strands 41 of the surface illuminant according to the invention (the remaining identically connected LED strands are not shown).
  • the arranged on the circuit board 32 LEDs 31 are summarized according to this embodiment to LED strands with 6 series-connected LEDs, wherein at the beginning and end of the strand in each case a resistor 33 is connected in series. All LED strings 41 consisting of 6 LEDs and 2 resistors are connected in parallel.
  • a voltage of 24 V which is applied to each of the parallel-connected LED strands 14 At each of the identical LEDs falls a forward voltage of 3.1 V with a tolerance of +/- 0.1 V and at each Resistor a voltage of 0.8V.
  • the resistors connected in series in the LEDs determine the current flow through the diodes through the resistance variable and the applied voltage and thus form the passive control of the luminous means.
  • Fig. 5a shows a view of the direction of emission of the LEDs used.
  • SMD LEDs Surface-mounted LEDs
  • the light is emitted through a circular opening 52, which does not have an excellent lens part with a beam angle of 120 degrees, thus avoiding disruptive refraction effects
  • Recess 53 indicates forward polarization
  • the LEDs used emit white light at a power of 62 mW per LED
  • the LEDs used have a length of 3.5 mm and a width of 2.8 mm
  • the LEDs 31 mounted on the printed circuit board have a forward voltage of 3.1 V, and a tolerance range (range of variation of the forward voltage) of +/- 0.1 V.
  • the LEDs used have a light intensity in the range of 1000 - 1300 med, and thus a tolerance range of 300 med Furthermore, the LEDs used have a color tolerance of about +/- 500 0 K to the range of 6500 0 K.
  • Fig. 5b shows a side view of the LEDs used, the have a height of 1.9 mm.
  • Fig. 5c shows a bottom view of the LED in the emission direction.
  • the foot surfaces 54 are mounted directly on a thermally conductive surface of the circuit board.
  • Device parameters can also be used in other combinations.

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)
  • Fastening Of Light Sources Or Lamp Holders (AREA)

Abstract

L'invention concerne un élément lumineux (30) présentant des LED (31) disposés sur une plaquette de circuit imprimé, l'élément lumineux (30) comprenant des LED (31) disposés à plat sur une plaquette de circuit imprimé (32), lesdits LED présentant une densité de groupement d'au moins 1 LED pour 2,5 cm2 sur une surface d'au moins 250 cm2, et une fluctuation de la tension directe des LED (31) ne dépassant pas d'une valeur prédéterminée, une valeur de +/- 5%. L'invention concerne en outre un luminaire plat, comprenant un boîtier destiné au logement de l'élément lumineux, le luminaire plat ayant un encombrement en hauteur < 30 mm, dans la direction du rayonnement.
PCT/EP2010/003949 2009-07-02 2010-07-02 Elément lumineux led et luminaire plat led WO2011000554A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP09164475.7 2009-07-02
EP09164475A EP2270387B1 (fr) 2009-07-02 2009-07-02 Lampe plate à DEL

Publications (1)

Publication Number Publication Date
WO2011000554A1 true WO2011000554A1 (fr) 2011-01-06

Family

ID=41693164

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/003949 WO2011000554A1 (fr) 2009-07-02 2010-07-02 Elément lumineux led et luminaire plat led

Country Status (3)

Country Link
EP (1) EP2270387B1 (fr)
AT (1) ATE525612T1 (fr)
WO (1) WO2011000554A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202011002769U1 (de) 2011-02-15 2011-04-28 Hagn_Leone Gmbh Flachleuchte und Gehäuse für eine Flachleuchte
WO2012158894A2 (fr) 2011-05-17 2012-11-22 Pixi Lighting Llc Dispositif d'éclairage à panneau plat et circuit de commande
DE102011082533A1 (de) 2011-09-12 2013-03-14 Hagn_Leone Gmbh LED-Flachleuchte und Reflektor für eine LED-Flachleuchte
US9500328B2 (en) 2013-04-17 2016-11-22 Pixi Lighting, Inc. Lighting assembly
US9476552B2 (en) 2013-04-17 2016-10-25 Pixi Lighting, Inc. LED light fixture and assembly method therefor
US9546781B2 (en) 2013-04-17 2017-01-17 Ever Venture Solutions, Inc. Field-serviceable flat panel lighting device
WO2015197387A1 (fr) * 2014-06-23 2015-12-30 Koninklijke Philips N.V. Source de lumière à del
US9557022B2 (en) 2015-04-30 2017-01-31 Ever Venture Solutions, Inc. Non-round retrofit recessed LED lighting fixture
CN106023844A (zh) * 2016-06-16 2016-10-12 合肥嫩芽科技有限公司 一种广告箱内led灯

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19747980A1 (de) 1997-10-30 1999-05-06 Wts Kereskedelmi Es Szolgaltat Beleuchtungskörper für Schwimmbäder und ähnliches
DE19917401A1 (de) * 1999-04-16 2000-10-26 Hauke Haller Beleuchtungskörper
EP1081426A2 (fr) * 1999-09-02 2001-03-07 Dinnebier Licht GmbH Elément d' éclairage avec une structure porteuse de montage, un couvercle et une source lumineuse
EP1082426A2 (fr) 1998-05-28 2001-03-14 Incyte Pharmaceuticals, Inc. Proteines socs humaines
US20020113246A1 (en) * 2001-01-25 2002-08-22 Hideo Nagai Light-emitting unit, light-emitting unit assembly, and lighting apparatus produced using a plurality of light-emitting units
US20050207165A1 (en) * 2001-08-09 2005-09-22 Matsushita Electric Industrial Co., Ltd. LED illumination apparatus and card-type LED illumination source
DE102008013589A1 (de) 2007-11-30 2009-06-04 Osram Opto Semiconductors Gmbh Beleuchtung eines Aquariums

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19747980A1 (de) 1997-10-30 1999-05-06 Wts Kereskedelmi Es Szolgaltat Beleuchtungskörper für Schwimmbäder und ähnliches
EP1082426A2 (fr) 1998-05-28 2001-03-14 Incyte Pharmaceuticals, Inc. Proteines socs humaines
DE19917401A1 (de) * 1999-04-16 2000-10-26 Hauke Haller Beleuchtungskörper
EP1081426A2 (fr) * 1999-09-02 2001-03-07 Dinnebier Licht GmbH Elément d' éclairage avec une structure porteuse de montage, un couvercle et une source lumineuse
US20020113246A1 (en) * 2001-01-25 2002-08-22 Hideo Nagai Light-emitting unit, light-emitting unit assembly, and lighting apparatus produced using a plurality of light-emitting units
US20050207165A1 (en) * 2001-08-09 2005-09-22 Matsushita Electric Industrial Co., Ltd. LED illumination apparatus and card-type LED illumination source
DE102008013589A1 (de) 2007-11-30 2009-06-04 Osram Opto Semiconductors Gmbh Beleuchtung eines Aquariums

Also Published As

Publication number Publication date
EP2270387B1 (fr) 2011-09-21
EP2270387A1 (fr) 2011-01-05
ATE525612T1 (de) 2011-10-15

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