EP1889303B1 - Light-generating arrangement - Google Patents

Light-generating arrangement Download PDF

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Publication number
EP1889303B1
EP1889303B1 EP06777261.6A EP06777261A EP1889303B1 EP 1889303 B1 EP1889303 B1 EP 1889303B1 EP 06777261 A EP06777261 A EP 06777261A EP 1889303 B1 EP1889303 B1 EP 1889303B1
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EP
European Patent Office
Prior art keywords
light
microstructure
generating arrangement
coupling
orienting element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP06777261.6A
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German (de)
French (fr)
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EP1889303A1 (en
Inventor
Eckhard Finger
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.)
Continental Automotive GmbH
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Continental Automotive GmbH
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Publication date
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Publication of EP1889303A1 publication Critical patent/EP1889303A1/en
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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
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • 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
    • 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 light-generating arrangement comprising a light-emitting semiconductor element having electrical leads, as well as a transparent light-aligning element arranged at a distance in the emission direction in front of the semiconductor element, by means of which the light emitted by the semiconductor element can be bundled into a directed luminous flux.
  • Light-emitting semiconductor elements in particular high-power LEDs, usually have a lambert radiation characteristic or a very large aperture angle of the emission characteristic.
  • the refractive and reflective secondary optics are used as light-aligning element in the high-power LEDs. These optics lead to a bundling of the luminous flux and to very high luminances in the forward direction.
  • a light-generating arrangement of the type mentioned is known.
  • a transparent cap is formed with a lens whose front outer surface and / or its inner surface are eroded.
  • a light-emitting diode wherein a plurality of chips are arranged in a recess of a base part.
  • the bottom and the peripheral wall of the recess are coated with a diffusing agent to effect a mixing of the light of the chips.
  • the object of the invention is therefore to provide a light-generating arrangement of the type mentioned, which avoids the disadvantages mentioned and the luminous flux is highly homogeneous and has no significant loss of brightness.
  • the decoupling surface of the light-aligning element has formed from a plurality of elevations and depressions microstructure through which the individual beam paths of the directed light beams of the luminous flux are deflected by an angle ⁇ 5 °.
  • a further solution to this problem is achieved in that the wall of the light-aligning element extending from the coupling surface to the coupling-out surface of the light-aligning element has a microstructure formed of a plurality of elevations and depressions, the reflection of the individual beam paths of the directed light beams of the luminous flux on the wall of the light-aligning element by an angle ⁇ 5 ° are deflected.
  • the light which is emitted by the semiconductor element in all directions is directed by the light-aligning element forming a secondary optic and emitted as a directed luminous flux.
  • the individual beam paths of the directed light beams of the luminous flux are so easily changed that, although within the luminous flux, which may be a light cone after radiation, the light is redistributed.
  • the elevations and depressions are preferably arranged distributed stochastically.
  • the light-generating arrangement shown has as light-emitting semiconductor element, a high-power LED (light emitting diode) 1, in front of the light emission in the direction of the light at a distance 2 is arranged.
  • a high-power LED light emitting diode
  • the secondary optics forming Lichtausrichtelement 2 is made of a transparent plastic as an injection molded part.
  • the non-directional light emitted by the high-power LED is introduced into a coupling surface 3 of the light-directing element 2 in this, and to a homogeneous and directed, inter alia, by reflection at the from the coupling surface 3 to a coupling-out 4 of the Lichtausrichtelements 2 extending wall 5 of the Lichtausrichtelements 2 aligned at the outcoupling surface 4 emerging luminous flux.
  • the decoupling surface 4 has a microstructure 6 of a plurality of uneven elevations and depressions, through which the beam paths of the aligned luminous flux are deflected at the exit from the Lichtausrichtelement 2 by an angle ⁇ 5 °.
  • the directed luminous flux is largely retained. There is only a slight change in the beam paths, which leads to a homogenization of the luminous flux.
  • microstructure 6 could also be arranged on the wall 5.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Led Device Packages (AREA)
  • Optical Elements Other Than Lenses (AREA)

Description

Die Erfindung bezieht sich auf eine lichterzeugende Anordnung mit einem lichtemittierenden Halbleiterelement, das elektrische Zuleitungen besitzt, sowie mit einem mit einem Abstand in Abstrahlrichtung vor dem Halbleiterelement angeordneten transparenten Lichtausrichtelement, durch das das von dem Halbleiterelement emittierte Licht zu einem gerichteten Lichtstrom bündelbar ist.
Lichtemittierende Halbleiterelemente, insbesondere Hochleistungs-LED's besitzen meist eine Lambert-Abstrahlcharakteristik bzw. einen sehr großen Öffnungswinkel der Abstrahlcharakteristik. Um eine gerichtete Abstrahlung zu erhalten, werden bei den Hochleistungs-LED's vornehmlich refraktive und reflektive Sekundäroptiken als Lichtausrichtelement eingesetzt. Diese Optiken führen zu einem Bündeln des Lichtstroms und zu sehr hohen Leuchtdichten in Vorwärtsrichtung.
Durch die Struktur der Halbleiterelemente, insbesondere auch durch deren elektrische Zuleitungen und Kontaktierungen kommt es zu einer deutlichen Inhomogenität des Lichtstroms.
Bei Einsatz von mehreren LED-Chips in einem Feld spiegelt sich die Positionierung der einzelnen Chips in der Helligkeitsverteilung des Lichtstroms wieder.
Handelt es sich weiterhin um LED-Chips unterschiedlicher Farbe, so ist meist die Vermischung der einzelnen Farbkomponenten unvollständig. Daher sind deutliche Farbvariationen über die Breite des Lichtstroms zu beobachten.
Diese Beeinflussungen des Lichtstroms sind sehr störend und schränken den Einsatz derartiger lichterzeugender Anordnungen ein.The invention relates to a light-generating arrangement comprising a light-emitting semiconductor element having electrical leads, as well as a transparent light-aligning element arranged at a distance in the emission direction in front of the semiconductor element, by means of which the light emitted by the semiconductor element can be bundled into a directed luminous flux.
Light-emitting semiconductor elements, in particular high-power LEDs, usually have a lambert radiation characteristic or a very large aperture angle of the emission characteristic. In order to obtain a directional radiation, the refractive and reflective secondary optics are used as light-aligning element in the high-power LEDs. These optics lead to a bundling of the luminous flux and to very high luminances in the forward direction.
Due to the structure of the semiconductor elements, in particular by their electrical leads and contacts there is a significant inhomogeneity of the luminous flux.
When using several LED chips in a field, the positioning of the individual chips in the brightness distribution of the luminous flux is reflected.
If it continues to be LED chips of different colors, then usually the mixing of the individual color components is incomplete. Therefore, significant color variations across the width of the luminous flux are observed.
These influences on the luminous flux are very disturbing and restrict the use of such light-generating arrangements.

Aus der US 2002/080615 A1 ist eine lichterzeugende Anordnung der eingangs genannten Art bekannt. Ein Teil der Oberfläche des Lichtausrichtelements ist aufgerauht um einen Teil des Lichtstroms diffus streuen zu lassen.From the US 2002/080615 A1 a light-generating arrangement of the type mentioned is known. A part of the surface of the light-aligning element is roughened to scatter a part of the luminous flux diffused.

Aus der US-A-5 349 509 ist eine lichterzeugende Anordnung der eingangs genannten Art bekannt. Um das Licht streuen zu können, ist eine transparente Kappe mit einer Linse ausgebildet, deren vordere Außenfläche und/oder deren Innenfläche erodiert sind.From the US-A-5,349,509 a light-generating arrangement of the type mentioned is known. In order to be able to scatter the light, a transparent cap is formed with a lens whose front outer surface and / or its inner surface are eroded.

Aus der US-A-5 266 817 ist eine Leuchtdiode bekannt, wobei mehrere Chips in einer Vertiefung eines Basisteils angeordnet sind. Der Boden und die umlaufende Wand der Vertiefung sind mit einem streuenden Mittel beschichtet, um eine Mischung des Lichts der Chips zu bewirken.From the US-A-5,266,817 a light-emitting diode is known, wherein a plurality of chips are arranged in a recess of a base part. The bottom and the peripheral wall of the recess are coated with a diffusing agent to effect a mixing of the light of the chips.

Aus der US 2005/093008 A1 und der US 2001/035713 A1 ist ein lichtemittierendes Element bekannt, das eine Diffusionsbeschichtung aufweist.From the US 2005/093008 A1 and the US 2001/035713 A1 For example, a light-emitting element that has a diffusion coating is known.

Aufgabe der Erfindung ist es daher, eine lichterzeugende Anordnung der eingangs genannten Art zu schaffen, die die genannten Nachteile vermeidet und deren Lichtstrom in hohem Maß homogen ist und keinen wesentlichen Verlust an Helligkeit aufweist.The object of the invention is therefore to provide a light-generating arrangement of the type mentioned, which avoids the disadvantages mentioned and the luminous flux is highly homogeneous and has no significant loss of brightness.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass die Auskoppelfläche des Lichtausrichtelements eine aus einer Vielzahl Erhebungen und Vertiefungen gebildete Mikrostruktur aufweist, durch die die einzelnen Strahlwege der gerichteten Lichtstrahlen des Lichtstroms um einen Winkel < 5° ablenkbar sind.This object is achieved in that the decoupling surface of the light-aligning element has formed from a plurality of elevations and depressions microstructure through which the individual beam paths of the directed light beams of the luminous flux are deflected by an angle <5 °.

Eine weitere Lösung dieser Aufgabe wird dadurch erreicht, dass die die von der Einkoppelfläche zur Auskoppelfläche des Lichtausrichtelements sich erstreckende Wandung des Lichtausrichtelements eine aus einer Vielzahl Erhebungen und Vertiefungen gebildete Mikrostruktur aufweist, die die Reflexion der einzelnen Strahlwege der gerichteten Lichtstrahlen des Lichtstroms an der Wandung des Lichtausrichtelements um einen Winkel < 5° ablenkbar sind.A further solution to this problem is achieved in that the wall of the light-aligning element extending from the coupling surface to the coupling-out surface of the light-aligning element has a microstructure formed of a plurality of elevations and depressions, the reflection of the individual beam paths of the directed light beams of the luminous flux on the wall of the light-aligning element by an angle <5 ° are deflected.

An sich wird durch das eine Sekundäroptik bildende Lichtausrichtelement das von dem Halbleiterelement in alle Richtungen abgestrahlte Licht gerichtet und als gerichteter Lichtstrom abgestrahlt.In itself, the light which is emitted by the semiconductor element in all directions is directed by the light-aligning element forming a secondary optic and emitted as a directed luminous flux.

Durch die Mikrostruktur werden die einzelnen Strahlwege der gerichteten Lichtstrahlen des Lichtstroms derart leicht geändert, dass zwar innerhalb des Lichtstroms, der nach Abstrahlung ein Lichtkegel sein kann, das Licht neu verteilt ist.Due to the microstructure, the individual beam paths of the directed light beams of the luminous flux are so easily changed that, although within the luminous flux, which may be a light cone after radiation, the light is redistributed.

Die Erhebungen und Vertiefungen sind vorzugsweise stochastisch verteilt angeordnet.The elevations and depressions are preferably arranged distributed stochastically.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im Folgenden näher beschrieben. Die einzige Figur der Zeichnung zeigt eine schematische Querschnittsdarstellung einer lichterzeugenden Anordnung.An embodiment of the invention is illustrated in the drawing and will be described in more detail below. The sole figure of the drawing shows a schematic cross-sectional representation of a light-generating arrangement.

Die dargestellte lichterzeugende Anordnung weist als lichtemittierendes Halbleiterelement eine Hochleistungs-LED (light emitting diode) 1 auf, vor der in Abstrahlrichtung des Lichts in einem Abstand ein Lichtausrichtelement 2 angeordnet ist.The light-generating arrangement shown has as light-emitting semiconductor element, a high-power LED (light emitting diode) 1, in front of the light emission in the direction of the light at a distance 2 is arranged.

Das eine Sekundäroptik bildende Lichtausrichtelement 2 ist aus einem transparenten Kunststoff als Spritzgussteil hergestellt.The secondary optics forming Lichtausrichtelement 2 is made of a transparent plastic as an injection molded part.

Das von der Hochleistungs-LED emittierte ungerichtete Licht wird an einer Einkoppelfläche 3 des Lichtausrichtelements 2 in dieses eingeleitet und unter anderem durch Reflektion an der von der Einkoppelfläche 3 zu einer Auskoppelfläche 4 des Lichtausrichtelements 2 sich erstreckenden Wandung 5 des Lichtausrichtelements 2 zu einem homogen und gerichtet an der Auskoppelfläche 4 austretenden Lichtstrom ausgerichtet.The non-directional light emitted by the high-power LED is introduced into a coupling surface 3 of the light-directing element 2 in this, and to a homogeneous and directed, inter alia, by reflection at the from the coupling surface 3 to a coupling-out 4 of the Lichtausrichtelements 2 extending wall 5 of the Lichtausrichtelements 2 aligned at the outcoupling surface 4 emerging luminous flux.

Die Auskoppelfläche 4 weist eine Mikrostruktur 6 aus einer Vielzahl ungleichmäßiger Erhebungen und Vertiefungen auf, durch die die Strahlwege des ausgerichteten Lichtstroms beim Austritt aus dem Lichtausrichtelement 2 um einen Winkel < 5° abgelenkt werden.
Damit wird der gerichtete Lichtstrom weitestgehend beibehalten. Es erfolgt nur eine leichte Veränderung der Strahlwege, was zu einer Homogenisierung des Lichtstroms führt.The decoupling surface 4 has a microstructure 6 of a plurality of uneven elevations and depressions, through which the beam paths of the aligned luminous flux are deflected at the exit from the Lichtausrichtelement 2 by an angle <5 °.
Thus, the directed luminous flux is largely retained. There is only a slight change in the beam paths, which leads to a homogenization of the luminous flux.

Anstatt der Anordnung der Mikrostruktur 6 an der Auskoppelfläche 4 könnte die Mikrostruktur auch an der Wandung 5 angeordnet sein.Instead of the arrangement of the microstructure 6 on the decoupling surface 4, the microstructure could also be arranged on the wall 5.

Dies würde dazu führen, dass zwar eine Reflektion der Strahlwege zu deren Ausrichtung erfolgt. Zusätzlich würden durch die Mikrostruktur diese Strahlwege aber noch um einen Winkel < 5° abgelenkt, wodurch der gerichtete Lichtstrom eine Homogenisierung erhalten würde.This would lead to a reflection of the beam paths to their orientation. In addition, these beam paths would be deflected by an angle <5 ° by the microstructure, whereby the directed luminous flux would receive a homogenization.

Claims (9)

  1. Light-generating arrangement comprising a light-emitting semiconductor element having electrical supply lines, and comprising a transparent light-orienting element arranged in front of the semiconductor element at a distance in the emission direction, by means of which light-orienting element the light emitted by the semiconductor element can be concentrated to form a directed luminous flux, characterized in that the coupling-out surface of the light-orienting element (2) has a microstructure (6) formed from a multiplicity of elevations and depressions, by means of which microstructure the individual beam paths of the directed light beams of the luminous flux can be deflected by an angle of < 5°.
  2. Light-generating arrangement comprising a light-emitting semiconductor element having electrical supply lines, and comprising a transparent light-orienting element arranged in front of the semiconductor element at a distance in the emission direction, by means of which light-orienting element the light emitted by the semiconductor element can be concentrated to form a directed luminous flux, characterized in that the wall (5) of the light-orienting element (2) that extends from the coupling-in surface (3) to the coupling-out surface (4) of the light-orienting element (2) has a microstructure formed from a multiplicity of elevations and depressions, by means of which microstructure the reflection of the individual beam paths of the directed light beams of the luminous flux at the wall (5) of the light-orienting element (2) can be deflected by an angle of < 5°.
  3. Light-generating arrangement according to either of Claims 1 and 2, characterized in that the light-orienting element is a converging lens.
  4. Light-generating arrangement according to one of Claims 1 to 3, characterized in that the microstructure (6) has a peak-to-value height of < 100 µm.
  5. Light-generating arrangement according to one of the preceding claims, characterized in that the light-orienting element (2) is a plastic injection-molded part having the microstructure integrally formed on its coupling-out surface (4) and/or on its wall.
  6. Light-generating arrangement according to one of Claims 1, 3 and 4, characterized in that the microstructure is formed on a transparent film and is fixed on the coupling-out surface by means of a refractive-index-matched adhesive.
  7. Light-generating arrangement according to one of Claims 1 to 4, characterized in that the microstructure is formed by means of a resist which is applied to the coupling-out surface and/or the wall of the light-orienting element and the free surface of which assumes the microstructure upon curing.
  8. Light-generating arrangement according to one of the preceding claims, characterized in that the microstructure is formed by a multiplicity of microlenses or microlens-like elevations arranged in a distributed manner on the coupling-out surface and/or on the wall of the orienting element.
  9. Light-generating arrangement according to one of the preceding claims, characterized in that the elevations and depressions are arranged in a stochastically distributed manner.
EP06777261.6A 2005-06-07 2006-06-02 Light-generating arrangement Active EP1889303B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005026206A DE102005026206A1 (en) 2005-06-07 2005-06-07 Light-generating arrangement
PCT/EP2006/062868 WO2006131501A1 (en) 2005-06-07 2006-06-02 Light-generating arrangement

Publications (2)

Publication Number Publication Date
EP1889303A1 EP1889303A1 (en) 2008-02-20
EP1889303B1 true EP1889303B1 (en) 2017-05-10

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EP06777261.6A Active EP1889303B1 (en) 2005-06-07 2006-06-02 Light-generating arrangement

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US (1) US8283685B2 (en)
EP (1) EP1889303B1 (en)
JP (1) JP2008543100A (en)
CN (1) CN101194371B (en)
DE (1) DE102005026206A1 (en)
WO (1) WO2006131501A1 (en)

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EP2737246A1 (en) 2011-07-25 2014-06-04 OSRAM GmbH A light source, for example for lighting surfaces
WO2014085896A1 (en) 2012-12-07 2014-06-12 Robert Bosch Gmbh Multiple beam shaping illumination system
CN104199190B (en) * 2014-09-24 2019-01-29 四川云盾光电科技有限公司 A kind of LED based beam shaping lens

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Also Published As

Publication number Publication date
WO2006131501A1 (en) 2006-12-14
EP1889303A1 (en) 2008-02-20
JP2008543100A (en) 2008-11-27
CN101194371B (en) 2013-03-27
DE102005026206A1 (en) 2006-12-14
CN101194371A (en) 2008-06-04
US8283685B2 (en) 2012-10-09
US20100200878A1 (en) 2010-08-12

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