EP2587133A1 - Lighting component with LED reflector strip - Google Patents

Lighting component with LED reflector strip Download PDF

Info

Publication number
EP2587133A1
EP2587133A1 EP20110187042 EP11187042A EP2587133A1 EP 2587133 A1 EP2587133 A1 EP 2587133A1 EP 20110187042 EP20110187042 EP 20110187042 EP 11187042 A EP11187042 A EP 11187042A EP 2587133 A1 EP2587133 A1 EP 2587133A1
Authority
EP
European Patent Office
Prior art keywords
circuit board
printed circuit
reflector
led
reflector strip
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.)
Granted
Application number
EP20110187042
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2587133B1 (en
Inventor
Alexander Kerpe
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.)
Hella GmbH and Co KGaA
Original Assignee
Hella KGaA Huek and Co
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 Hella KGaA Huek and Co filed Critical Hella KGaA Huek and Co
Priority to EP11187042.4A priority Critical patent/EP2587133B1/en
Publication of EP2587133A1 publication Critical patent/EP2587133A1/en
Application granted granted Critical
Publication of EP2587133B1 publication Critical patent/EP2587133B1/en
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
    • 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
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S4/00—Lighting devices or systems using a string or strip of light sources
    • F21S4/20—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S4/00—Lighting devices or systems using a string or strip of light sources
    • F21S4/20—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports
    • F21S4/28—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports rigid, e.g. LED bars
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/0066—Reflectors for light sources specially adapted to cooperate with point like light sources; specially adapted to cooperate with light sources the shape of which is unspecified
    • 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
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the invention relates to a LED-based lighting component and to an assembly method of such a component. It specifically relates to a reflector mounted to a printed circuit board holding LEDs.
  • LED lighting systems offer significant advantages over traditional incandescent, HID and fluorescent lamps. LEDs are of smaller size, offer higher reliability, longer operational life and lower energy consumption. However, there are specific requirements when using LEDs. As increased operating temperature significantly reduces lifetime, cooling is of high importance. Furthermore, most LED chips are approximately isotropic light sources with a lambertian light distribution, which must be adapted to specific requirements of a lighting system.
  • the US patent application publication 2008/027894181 A1 discloses a printed circuit board with LEDs soldered thereon.
  • injection molded reflectors are positioned above each individual LED.
  • the disadvantage is that the reflectors must be manually assembled to the printed circuit board. This is a complex and time-consuming step.
  • the reflectors are comparatively complex and expensive. Changing of light distribution requires modifying the reflectors, including redesigning, making new tools and producing new reflectors.
  • the problem to be solved by the invention is to provide means for cooling and adapting the light distribution of LEDs mounted to a carrier like a printed circuit board.
  • a preferred embodiment relates to a LED-based lighting component comprising a strip shaped printed circuit board and a plurality of LEDs mounted thereon.
  • a reflector strip is placed on the printed circuit board.
  • the reflector strip is of sheet metal with punched reflectors.
  • the reflectors extend over the surface of the printed circuit board. They guide the light of the LED chips, which often have an approximated lambertian light distribution.
  • the reflector strip can easily be manufactured from sheet metal by a simple process of punching and bending the reflectors of the main plane, which is defined by the metal sheet. This allows for a precise and inexpensive manufacturing process of high volumes of the reflector strip.
  • the reflector strip may comprise reflectors for any number of LEDs.
  • the reflector strip preferably has guides for aligning the reflector strip to the printed circuit board.
  • the guides are positioned within holes of the printed circuit board. Alignment of the reflector strip in relation to the LEDs by means of the guides is an easy procedure, as the reflector strip simply has to be placed on the printed circuit board and the to be moved over the surface of the printed circuit board until the guides snap into the holes of the printed circuit board. This further prevents damaging of LEDs or other electronic components on the printed circuit board by touching these with the reflector strip.
  • the guides may be bent back from the rear side of the printed circuit board to hold the reflector strip down to the printed circuit board.
  • the reflector strip may also be glued or soldered to the printed circuit board. It is preferred to insert the printed circuit board together with the reflector strip into a frame.
  • the frame may have one or two braces.
  • the frame may also serve as mechanical support, a heat sink or as an insulator of the assembly.
  • the frame may be a strand casted, pultruded or extruded profile. It preferably has overhangs to hold the reflector strip down to the printed circuit board and further to fix the reflector strip and the printed circuit board within the frame.
  • the reflector strip may have springs. These assert a predetermined force to the reflector strip.
  • the printed circuit board with attached reflector strip is pushed into an opening at the end of the profile. Slipping of the printed circuit board within the profile may be prevented by end caps or by a lug or a screw.
  • a reflector strip comprises at least one reflector.
  • the reflector strip is preferably made of metal, which may be aluminum or brass, or any other material, which has a light reflecting surface.
  • the reflector strip is a metal sheet and the at least one reflector is punched from this metal sheet.
  • the at least one reflector may be part of the surface of the reflector strip which is bent into an angle from a main plane of the reflector strip.
  • the reflector strip has at least one blanking or opening for the at least one LED, thus surrounding the LED on the printed circuit board.
  • the reflector strip may have further blankings leaving space for further electronic components on the printed circuit board.
  • the reflector strip may further have at least one guide for precisely locating the reflector strip in relation to the printed circuit board.
  • the reflector strip may have at least one spring and/or an elastic element for pressing the reflector strip to the printed circuit board.
  • the reflector strip is placed on a printed circuit board, the printed circuit board holding at least one LED, preferably a plurality of LEDs in predetermined distances. Most preferably these predetermined distances are constant.
  • a frame may be provided for fastening the reflector strip to the printed circuit board.
  • the frame may furthermore act as at least one of a mechanical support, a heat sink, an insulator.
  • the frame is a profile, which may be manufactured by strand casting, pultrusion or extrusion.
  • the frame is preferably made of metal or ceramics, most preferably of aluminum.
  • the reflector strip has a first reflector and a second reflector, being located at opposing sides of a LED.
  • the reflector strip has four reflectors being located at or four sides of a rectangular LED. There may be any other number or any other shape of the reflectors.
  • the reflectors reflect light from the LED into a different direction than it was emitted from the LED
  • the reflectors may also and/or alternatively shade light from the LED, thus preventing light radiating into unwanted directions.
  • the reflector strip may be mounted at the opposite side of the LEDs of the printed circuit board.
  • the printed circuit board may have at least one opening or slot, through which the individual reflectors can penetrate the printed circuit board.
  • the strip to the printed circuit board is a very simple procedure.
  • the first step the reflector strip is positioned on the printed circuit board. Alignment may be simplified by inserting at least one bent guide of the strip into at least one hole of the printed circuit board.
  • the strip and the printed circuit board are inserted into the frame by pushing them into a slot opening at one end of the frame.
  • the frame may further support alignment of the strip and the printed circuit board. By means of a flat spring, the printed circuit board and the strip are held in a predetermined position relative to the frame.
  • a further advantage of the embodiment is that the light distribution can easily be adapted to individual needs by simply changing the angle between a reflector and the reflector strip. This can even be done manually in a fine adjusting procedure after assembly. It is not necessary to manufacture a different strip for each modified reflector setting.
  • At least one LED 20 is mounted to a printed circuit board 10.
  • a reflector strip 30 is located on the printed circuit board.
  • This reflector strip has at least one blanking or opening 38 for a LED. It further has at least one reflector 34.
  • there is at least a second reflector 35 preferably at the opposite side of the LED in relation to the first reflector 34.
  • the reflectors 34, 35 are punched out and bent upwards from the reflector strip. This may result in at least one additional blanking 39.
  • For aligning the reflector strip to the printed circuit board there may be at least one guide 31.
  • the at least one guide 31 is punched out of the reflector strip. Furthermore, it is preferred, if there is at least one flat spring 32, which preferably is also punched out of the reflector strip.
  • the length of the reflector strip is preferably adapted to the number of LEDs on the printed circuit board. It may have a length from 10 mm up to 1 meter or more.
  • the reflector strip may alternatively have a length adapted to one LED. It may comprise only one blanking or opening 38 for a LED and the reflectors required for the LED, e.g. two or four reflectors.
  • Figure 2 shows the preferred embodiment in a side view.
  • first reflector 34 and the second reflector 35 are shown from their sides in an angle and bent upwards from the surface of reflector strip 30, which is located on the printed circuit board 10.
  • Reflector strip 30 on top of the printed circuit board 10 is assembled with a frame 40.
  • the frame has at least one overhang 41 to hold the reflector strip 30 down to the printed circuit board 10. It preferably interacts with the at least one flat spring 32 to assert a predetermined force to the reflector strip.
  • Frame 40 may be designed to act as a mechanical support structure and/or a heat sink and/or electrical insulator for the assembly. It is preferred if the reflector strip has approximately the same width as the printed circuit board.
  • Figure 4 shows in detail the alignment of reflector strip 30 with printed circuit board 10.
  • a bent guide tip 33 of reflector strip 30 is inserted into a hole 11 of the printed circuit board 10 thereby allowing precise positioning of the reflector strip 30 in relationship to printed circuit board 10.
  • the bent guide tip 33 with the extent through printed circuit board 10 to its side opposing the reflector strip. It may further be bent to a U- shape to fix the reflector strip to the printed circuit board.
  • Figure 5 shows another embodiment, where four reflectors enclose LED 20.
  • a first reflector 34, second reflector 35, third reflector 36 and fourth reflector 37 enclose the LED at four sides.
  • Figure 6 shows the previous embodiment in a side view.
  • first reflector 34 and the second reflector 35 are shown from their sides in an angle and bent upwards from the surface of reflector strip 30, which is located on the printed circuit board 10.
  • reflector 37 is shown from its rear side.
  • FIG 7 the embodiment with four reflectors is shown in a state assembled together with a frame 40.
  • reflectors 36 and 37 are shown from their sides.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Fastening Of Light Sources Or Lamp Holders (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
EP11187042.4A 2011-10-28 2011-10-28 Lighting component with led reflector strip Not-in-force EP2587133B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11187042.4A EP2587133B1 (en) 2011-10-28 2011-10-28 Lighting component with led reflector strip

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11187042.4A EP2587133B1 (en) 2011-10-28 2011-10-28 Lighting component with led reflector strip

Publications (2)

Publication Number Publication Date
EP2587133A1 true EP2587133A1 (en) 2013-05-01
EP2587133B1 EP2587133B1 (en) 2016-04-20

Family

ID=45442809

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11187042.4A Not-in-force EP2587133B1 (en) 2011-10-28 2011-10-28 Lighting component with led reflector strip

Country Status (1)

Country Link
EP (1) EP2587133B1 (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9541255B2 (en) 2014-05-28 2017-01-10 Lsi Industries, Inc. Luminaires and reflector modules
EP3129701A4 (en) * 2014-04-07 2017-10-11 3M Innovative Properties Company Light horn arrays for ducted lighting systems

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080278941A1 (en) 2007-05-07 2008-11-13 Philips Solid-State Lighting Solutions, Inc. Led-based lighting fixtures for surface illumination with improved heat dissipation and manufacturability
EP2051001A2 (en) * 2007-10-17 2009-04-22 LSI Industries, Inc. Roadway luminaire and methods of use
US20090257215A1 (en) * 2006-07-25 2009-10-15 Showa Denko K.K. Light emitting device and display device using same
EP2138753A1 (en) * 2007-03-22 2009-12-30 The Furukawa Electric Co., Ltd. Light box
DE202009002978U1 (de) * 2009-03-04 2010-07-22 Zumtobel Lighting Gmbh Optisches Element für LED-Leuchten
EP2320124A1 (en) * 2009-11-10 2011-05-11 LSI Industries, Inc. Modular light reflectors and assemblies for luminaire

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090257215A1 (en) * 2006-07-25 2009-10-15 Showa Denko K.K. Light emitting device and display device using same
EP2138753A1 (en) * 2007-03-22 2009-12-30 The Furukawa Electric Co., Ltd. Light box
US20080278941A1 (en) 2007-05-07 2008-11-13 Philips Solid-State Lighting Solutions, Inc. Led-based lighting fixtures for surface illumination with improved heat dissipation and manufacturability
EP2051001A2 (en) * 2007-10-17 2009-04-22 LSI Industries, Inc. Roadway luminaire and methods of use
DE202009002978U1 (de) * 2009-03-04 2010-07-22 Zumtobel Lighting Gmbh Optisches Element für LED-Leuchten
EP2320124A1 (en) * 2009-11-10 2011-05-11 LSI Industries, Inc. Modular light reflectors and assemblies for luminaire

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3129701A4 (en) * 2014-04-07 2017-10-11 3M Innovative Properties Company Light horn arrays for ducted lighting systems
US9541255B2 (en) 2014-05-28 2017-01-10 Lsi Industries, Inc. Luminaires and reflector modules

Also Published As

Publication number Publication date
EP2587133B1 (en) 2016-04-20

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