EP2875287B1 - Light-emitting assembly and lamp having a light-emitting assembly - Google Patents

Light-emitting assembly and lamp having a light-emitting assembly Download PDF

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Publication number
EP2875287B1
EP2875287B1 EP13736916.1A EP13736916A EP2875287B1 EP 2875287 B1 EP2875287 B1 EP 2875287B1 EP 13736916 A EP13736916 A EP 13736916A EP 2875287 B1 EP2875287 B1 EP 2875287B1
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EP
European Patent Office
Prior art keywords
light
emitting
optical element
insulating
emitting arrangement
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EP13736916.1A
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German (de)
French (fr)
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EP2875287A1 (en
Inventor
Piere Angelo FAVAROLO
Stefan KORNHAAS
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Zumtobel Lighting GmbH Austria
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Zumtobel Lighting GmbH Austria
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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
    • F21V29/15—Thermal insulation
    • 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
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/02—Combinations of only two kinds of elements
    • F21V13/04—Combinations of only two kinds of elements the elements being reflectors and refractors
    • 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
    • F21V29/86—Ceramics or glass
    • 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
    • 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
    • F21Y2101/00—Point-like light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the invention relates to a light-emitting arrangement with a light-emitting element and an optical element for influencing the light. Furthermore, the invention relates to a lamp with such a light-emitting arrangement.
  • the optical element consists of a material which has a correspondingly low thermal resistance, ie in particular a comparatively low softening point or melting point or decomposition point.
  • a material which has a correspondingly low thermal resistance ie in particular a comparatively low softening point or melting point or decomposition point.
  • the optical element can be, for example, a plastic lens or act a scattering film made of plastic. Even a very small amount of contamination can trigger the effect mentioned.
  • a point 22 which simulates or represents a corresponding dirt particle, was applied to the light-entry surface 21 of the plastic lens, here designated 20', with a felt-tip pen.
  • This arrangement was provided with a light-emitting element—here in the form of an LED light source (LED: light-emitting diode)—and operated with the light-emitting light-emitting element for two hours.
  • figure 5 shows the state after two hours: practically the entire light entry surface 21 is irregularly deformed and black due to the destruction.
  • a lighting fixture which has a light source and a refractor wall made of plastic.
  • a diffuser made of glass is arranged between the light source and the refractor wall.
  • a headlight in which a heat shield is arranged between a light source and a lens for absorbing infrared radiation.
  • a headlight is known in which a filter disk is arranged between a light source and a Fresnel lens.
  • a headlamp assembly having a light source, a lens, and a heat shield disposed therebetween.
  • a lighting system having a lamp, a lens, and a light-transmitting filter placed between the lamp and the lens.
  • the lens and the filter are held in a tubular element.
  • the invention is based on the object of specifying a corresponding light-emitting arrangement or a lamp with a light-emitting arrangement in which the risk of damage caused by heat is reduced.
  • a light-emitting arrangement which has a light-emitting element for emitting a light and an optical element for influencing the light. Furthermore, the light-emitting arrangement has a light-transmissive insulating element which is arranged in the path of the light, wherein the insulating element is formed in one piece and is made of a more thermally stable material than the optical element. Furthermore, the light-emitting arrangement has an enclosing element, the enclosing element being arranged in a dust-tight manner enclosing both the optical element and the insulating element, the optical element being a lens made of plastic and the light-emitting element being mounted directly on the enclosing element.
  • the probability of unwanted particle deposits on or on the optical element can be significantly reduced or even practically ruled out by the transparent insulating element. If a particle attaches itself to the insulating element on the side opposite the optical element, the corresponding heat resulting from absorption is distributed within the insulating element by thermal conduction; moreover, a thermal resistance between the particle and the optical element is formed by the insulating element itself. In this way, the probability of thermally induced damage to the optical element is significantly reduced.
  • the insulating element is preferably arranged in such a way that the light emitted by the light-emitting element first passes through the insulating element and then enters the optical element.
  • the optical element is a lens made of plastic.
  • the insulating element is preferably made of glass.
  • a particularly space-saving configuration can be achieved if the insulating element is designed in the form of a plate or disk. In addition, it can be achieved in this way that the light is influenced particularly little as it passes through the insulating element.
  • a particularly high thermal resistance towards the optical element can be achieved if the light emission arrangement is designed in such a way that an air-filled space is formed between the optical element and the insulating element. Through Such an air space or air gap can further reduce the heating of the optical element.
  • the insulating element causes the heat to be distributed by thermal conduction and the air-filled space contributes to the formation of a particularly high thermal resistance.
  • the insulating element consists of one piece.
  • a particularly simple design can be achieved in this way.
  • it can be achieved in this way that the light is weakened or deflected particularly little by the insulating element, so that the efficiency of the light-emitting arrangement is impaired particularly little.
  • the light-emitting arrangement also has an enclosing element which is arranged in a dust-tight manner enclosing both the optical element and the insulating element.
  • the air-filled space can be delimited by the optical element, the insulating element and the enclosing element. In this way, too, it is practically impossible for a particle to accumulate on the light entry surface of the optical element.
  • the enclosing element is preferably designed and arranged in such a way that it delimits a light entry surface for the entry of the light into the optical element. This enables a particularly simple design of the light emission arrangement.
  • the light-emitting element is mounted directly on the enclosing element.
  • the enclosing element preferably consists of a non-translucent material, for example plastic or metal. In this way it can be achieved that particularly little light escapes from the light-emitting arrangement on the path of the light between the insulating element and the optical element, so that the efficiency of the light-emitting arrangement is increased.
  • the enclosing element is preferably a reflector element. As a result, the number of components in the light-emitting arrangement can be kept particularly low.
  • the enclosing element is formed in one piece. This also allows the number of components to be kept low.
  • the enclosing element can be made up of several individual parts. As a result, a particularly simple assembly of the light-emitting arrangement can be made possible under certain circumstances.
  • a lamp is provided, in particular in the form of a spotlight, which has a light-emitting arrangement according to the invention.
  • the light-emitting arrangement comprises a light-emitting element 1 for emitting a light.
  • the light-emitting element 1 is indicated only schematically.
  • the light-emitting element 1 can be an LED light source, ie, for example, a circuit board on which an LED is arranged or a plurality of LEDs are arranged.
  • the light-emitting arrangement also includes an optical element 2 for influencing the light emitted by the light-emitting element 1 .
  • the optical element 2 consists of a plastic.
  • the optical element 2 is a lens.
  • the optical element 2 preferably has a light entry surface 25 which is designed for entry of the light emitted by the light emitting element 1 .
  • the light entry surface 25 can be formed by a surface area of the optical element 2 facing the light emitting element 1 .
  • the light-emitting arrangement further comprises a light-transmitting insulating element 3.
  • the insulating element 3 is arranged in the path of the light and is made of a material which is more thermally stable than the material from which the optical element 2 is made.
  • the design is such that the insulating element 3 is arranged in such a way that the light emitted by the light-emitting element 1 first passes through the insulating element 3 and then enters the optical element 2 .
  • the insulating element 3 is preferably made of glass. Glass is thermally more stable than plastic.
  • the insulating element 3 is preferably designed in the form of a plate or disk. In addition, it consists of only one piece. In this way, the passage of light is particularly little affected.
  • the insulating element 3 allows a thermally comparatively stable “intermediate layer” to be formed between the thermally more susceptible optical element 2 on the one hand and a possibly present particle 9 on the other hand. Due to the transparency of the insulating element 3, it can be achieved that the optical properties of the light-emitting arrangement, in particular its photometric efficiency, are not significantly impaired.
  • the intermediate layer or the insulating element 3, so to speak, distributes the heat that accumulates in the case of accumulated particle 9 forms upon entry of light by absorption, by thermal conduction and represents a thermal resistance between the particle 9 and the optical element 2. As a result, the temperature of the optical element 2 is kept correspondingly low.
  • the thermal conductivity of the insulating element 3 is non-directional or isotropic and is comparatively high, the heat is distributed very well, but the thermal resistance perpendicular to the insulating element 3, which is formed by the insulating element 3, is comparatively low.
  • the thermal conductivity of the insulating member 3 is comparatively low, the thermal resistance between the particle 9 and the optical member 2 is comparatively large, but the heat is not distributed well. This effect can be counteracted effectively if the light emission arrangement is designed in such a way that an air-filled space or an air layer is formed between the insulating element 3 and the optical element 2 (not shown in the figures).
  • the heat is well distributed within the insulating material 3, but the thermal resistance between the particle 9 and the optical element 2 is nevertheless particularly high due to the air layer.
  • the distance between the optical element 2 or the light entry surface 25 of the optical element 2 on the one hand and the insulating element 3 on the other is preferably at least 1 mm, particularly preferably at least 2 mm.
  • the light emission arrangement also includes a diffusing screen 5 which is arranged between the optical element 2 and the insulating element 3 .
  • the lens 5 can be made of plastic.
  • the diffusing screen 5 itself represents an optical element that is protected by the insulating element 3 in an analogous manner.
  • the light-emitting arrangement also has an enclosing element 4 which is designed and arranged in such a way that it encloses both the optical element 2 and the insulating element 3 in a dust-tight manner. In this way, it is practically possible to prevent a particle from accidentally accumulating on the light entry surface 25 .
  • the design can be such that - as in 2 indicated - the enclosing element 4 has a hollow-cylindrical area B and the optical element 2 has a cylindrical outer surface with which it contacts the hollow-cylindrical area B and likewise the insulating element 3 has a cylindrical outer surface with which it contacts the hollow-cylindrical area B of the enclosing element 3.
  • the shape is preferably circular-cylindrical in each case.
  • the enclosing element 4 can be designed and arranged in such a way that it delimits the light entry surface 25 of the optical element 2 .
  • the configuration is such that the light-emitting element 1 is mounted directly on the enclosing element 4 .
  • the enclosing element 4 consists of a non-translucent material, for example plastic or metal.
  • the enclosing element can be a reflector element, which is preferably also designed to influence the light, in particular the light that has exited the optical element 2 again.
  • the enclosing element 4 can be formed from one piece, but it can also consist of several pieces.
  • the light-emitting arrangement also has an annular reflector element 8 , for example in the form of a reflector foil, which is arranged on the side of the insulating element 3 opposite the optical element 2 .
  • the light-emitting arrangement particularly preferably forms part of a lamp, in particular a spotlight.
  • the lamp can be designed to emit light downwards.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Projection Apparatus (AREA)

Description

Die Erfindung betrifft eine Lichtabgabeanordnung mit einem Lichtabstrahlelement und einem optischen Element zur Beeinflussung des Lichts. Weiterhin betrifft die Erfindung eine Leuchte mit einer derartigen Lichtabgabeanordnung.The invention relates to a light-emitting arrangement with a light-emitting element and an optical element for influencing the light. Furthermore, the invention relates to a lamp with such a light-emitting arrangement.

Bei einer derartigen Lichtabgabeanordnung kann es dazu kommen, dass sich ungewollt ein Schmutz- oder Staubpartikel an einer Stelle der Oberfläche des optischen Elements ablagert, die sich in dem Weg des von dem Lichtabstrahlelement abgestrahlten Lichts befindet. Das auf dieses Partikel auftreffende Licht wird im Allgemeinen zu einem erheblichen Teil von dem Partikel absorbiert, so dass es zu einer lokalen Temperaturzunahme kommt, die sich im Weiteren durch Wärmeleitung innerhalb des optischen Elements mehr oder weniger ausbreitet. Wenn die Temperatur die Erweichungstemperatur bzw. Schmelztemperatur des Materials übersteigt, aus dem das optische Element besteht, kommt es zur Verformung bzw. zum Schmelzen des optischen Elements. Falls es aufgrund der Erwärmung auch zu einer Verfärbung des optischen Elements kommt, kann darüber hinaus eine "Kettenreaktion" auftreten, da durch eine solche Verfärbung in der Regel wiederum mehr Strahlung bzw. Licht absorbiert wird. Die betreffende Temperaturzunahme kann also zu einer Beschädigung des optischen Elements führen. Darüber hinaus kann es unter Umständen auch zur Beschädigung weiterer Bauteile der Lichtabgabeanordnung kommen und sogar zur vollständigen Zerstörung der Lichtabgabeanordnung.With such a light-emitting arrangement, it can happen that a dirt or dust particle is unintentionally deposited at a point on the surface of the optical element that is in the path of the light emitted by the light-emitting element. The light impinging on this particle is generally absorbed by the particle to a considerable extent, so that there is a local increase in temperature, which then spreads to a greater or lesser extent within the optical element as a result of thermal conduction. When the temperature exceeds the softening or melting temperature of the material from which the optical element is made, deformation or melting of the optical element occurs. If the heating also causes discoloration of the optical element, a "chain reaction" can also occur, since such discoloration generally means that more radiation or light is absorbed. The temperature increase in question can therefore lead to damage to the optical element. In addition, other components of the light emitting arrangement may also be damaged under certain circumstances, and the light emitting arrangement may even be completely destroyed.

Das skizzierte Problem ergibt sich dementsprechend insbesondere, wenn das optische Element aus einem Material besteht, das eine entsprechend geringe thermische Beständigkeit aufweist, also insbesondere eine vergleichsweise niedrige Erweichungstemperatur bzw. Schmelz- bzw. Zersetzungstemperatur. In der Praxis ist dies insbesondere der Fall, wenn das optische Element aus Kunststoff besteht. Bei dem optischen Element kann es sich dabei beispielsweise um eine Kunststofflinse oder um eine Streufolie aus Kunststoff handeln. Dabei kann bereits eine sehr geringe Verschmutzung zur Auslösung des genannten Effekts führen.The problem outlined accordingly arises in particular when the optical element consists of a material which has a correspondingly low thermal resistance, ie in particular a comparatively low softening point or melting point or decomposition point. In practice, this is particularly the case when the optical element is made of plastic. The optical element can be, for example, a plastic lens or act a scattering film made of plastic. Even a very small amount of contamination can trigger the effect mentioned.

In Fig. 3 ist ein Teil einer entsprechend zerstörten Lichtabgabeanordnung gezeigt. Man erkennt das zerstörte optische Element 20 - hier in Form einer zerstörten Kunststofflinse. Die Kunststofflinse ist von einem Reflektor 30 umgeben, der ebenfalls beschädigt worden ist. Die Bauteile sind durch Schmelzen bzw. Zersetzen beschädigt bzw. zerstört. Wie oben erwähnt, kann es also nicht nur zur Zerstörung des optischen Elements, hier der Kunststofflinse, an sich kommen, sondern sogar zur Beschädigung weiterer Komponenten der Lichtabgabeanordnung.In 3 a part of a correspondingly destroyed light-emitting arrangement is shown. You can see the destroyed optical element 20 - here in the form of a destroyed plastic lens. The plastic lens is surrounded by a reflector 30 which has also been damaged. The components are damaged or destroyed by melting or decomposition. As mentioned above, not only can the optical element itself, here the plastic lens, be destroyed, but other components of the light-emitting arrangement can even be damaged.

Zur weiteren Demonstration des Effekts ist in Fig. 4 ein Teil einer entsprechenden Lichtabgabeanordnung gezeigt, bei der auf die Lichteintrittsfläche 21 der Kunststofflinse, hier mit 20' bezeichnet, mit einem Filzstift ein Punkt 22 aufgebracht wurde, der ein entsprechendes Schmutzpartikel simuliert bzw. darstellt. Diese Anordnung wurde mit einem Lichtabstrahlelement - hier in Form einer LED-Lichtquelle (LED: lichtemittierende Diode) - versehen und zwei Stunden lang bei lichtabgebendem Lichtabstrahlelement betrieben. Fig. 5 zeigt den Zustand nach zwei Stunden: Praktisch die gesamte Lichteintrittsfläche 21 ist durch die Zerstörung unregelmäßig verformt und schwarz.To further demonstrate the effect, in 4 a part of a corresponding light-emitting arrangement is shown, in which a point 22, which simulates or represents a corresponding dirt particle, was applied to the light-entry surface 21 of the plastic lens, here designated 20', with a felt-tip pen. This arrangement was provided with a light-emitting element—here in the form of an LED light source (LED: light-emitting diode)—and operated with the light-emitting light-emitting element for two hours. figure 5 shows the state after two hours: practically the entire light entry surface 21 is irregularly deformed and black due to the destruction.

Aus der DE 2 032 229 A1 ist ein Beleuchtungskörper bekannt, der eine Lichtquelle und eine, aus Kunststoff bestehende Refraktorwand aufweist. Zwischen der Lichtquelle und der Refraktorwand ist ein aus Glas bestehender Diffusor angeordnet.From the DE 2 032 229 A1 a lighting fixture is known which has a light source and a refractor wall made of plastic. A diffuser made of glass is arranged between the light source and the refractor wall.

Aus der FR 2 687 761 A1 ist ein Scheinwerfer bekannt, bei dem zwischen einer Lichtquelle und einer Linse zur Absorption von Infrarotstrahlung ein Wärmeschild angeordnet ist.From the FR 2 687 761 A1 a headlight is known in which a heat shield is arranged between a light source and a lens for absorbing infrared radiation.

Aus der US 3,120,352 ist ein Scheinwerfer bekannt, bei dem zwischen einer Lichtquelle und einer Fresnel-Linse eine Filterscheibe angeordnet ist. Aus der FR 2 898 403 A1 ist eine Scheinwerferanordnung mit einer Lichtquelle, einer Linse und einem dazwischen angeordneten Wärmeschild bekannt.From the U.S. 3,120,352 a headlight is known in which a filter disk is arranged between a light source and a Fresnel lens. From the FR 2 898 403 A1 discloses a headlamp assembly having a light source, a lens, and a heat shield disposed therebetween.

Aus der US 2002/0067542 A1 ist ein Beleuchtungssystem mit einer Lampe, einer Linse und einem, zwischen der Lampe und der Linse angeordneten, lichtdurchlässigen Filter. Die Linse und der Filter sind dabei in einem rohrförmigen Element gehalten.From the US 2002/0067542 A1 is a lighting system having a lamp, a lens, and a light-transmitting filter placed between the lamp and the lens. The lens and the filter are held in a tubular element.

Der Erfindung liegt die Aufgabe zugrunde, eine entsprechende Lichtabgabeanordnung bzw. eine Leuchte mit einer Lichtabgabeanordnung anzugeben, bei der die Gefahr einer wärmebedingten Beschädigung vermindert ist.The invention is based on the object of specifying a corresponding light-emitting arrangement or a lamp with a light-emitting arrangement in which the risk of damage caused by heat is reduced.

Diese Aufgabe wird gemäß der Erfindung mit den in den unabhängigen Ansprüchen genannten Gegenständen gelöst. Besondere Ausführungsarten der Erfindung sind in den abhängigen Ansprüchen angegeben.This object is solved according to the invention with the objects mentioned in the independent claims. Particular embodiments of the invention are indicated in the dependent claims.

Gemäß der Erfindung ist eine Lichtabgabeanordnung vorgesehen, die ein Lichtabstrahlelement zur Abstrahlung eines Lichts aufweist, sowie ein optisches Element zur Beeinflussung des Lichts. Weiterhin weist die Lichtabgabeanordnung ein lichtdurchlässiges Isolierelement auf, das in dem Weg des Lichts angeordnet ist, wobei das Isolierelement aus einem Stück bestehend ausgebildet ist und aus einem thermisch stabileren Material besteht als das optische Element. Weiterhin weist die Lichtabgabeanordnung ein Umfassungselement auf, wobei das Umfassungselement sowohl das optische Element als auch das Isolierelement staubdicht umfassend angeordnet ist, wobei das optische Element eine aus Kunststoff bestehende Linse ist und das Lichtabstrahlelement unmittelbar an dem Umfassungselement gehaltert angeordnet ist.According to the invention, a light-emitting arrangement is provided which has a light-emitting element for emitting a light and an optical element for influencing the light. Furthermore, the light-emitting arrangement has a light-transmissive insulating element which is arranged in the path of the light, wherein the insulating element is formed in one piece and is made of a more thermally stable material than the optical element. Furthermore, the light-emitting arrangement has an enclosing element, the enclosing element being arranged in a dust-tight manner enclosing both the optical element and the insulating element, the optical element being a lens made of plastic and the light-emitting element being mounted directly on the enclosing element.

Durch das lichtdurchlässige Isolierelement lässt sich die Wahrscheinlichkeit einer ungewollten Partikel-Ablagerung an bzw. auf dem optischen Element deutlich reduzieren oder gar praktisch ausschließen. Falls sich ein Partikel an dem Isolierelement, auf der, dem optischen Element gegenüber liegenden Seite, anlagert, wird die entsprechende, durch Absorption entstehende Wärme innerhalb des Isolierelements durch Wärmeleitung verteilt; außerdem ist durch das Isolierelement selbst ein thermischer Widerstand zwischen dem Partikel und dem optischen Element gebildet. Auf diese Weise ist die Wahrscheinlichkeit einer thermisch bedingten Beschädigung des optischen Elements signifikant verringert.The probability of unwanted particle deposits on or on the optical element can be significantly reduced or even practically ruled out by the transparent insulating element. If a particle attaches itself to the insulating element on the side opposite the optical element, the corresponding heat resulting from absorption is distributed within the insulating element by thermal conduction; moreover, a thermal resistance between the particle and the optical element is formed by the insulating element itself. In this way, the probability of thermally induced damage to the optical element is significantly reduced.

Vorzugsweise ist das Isolierelement derart angeordnet, dass das von dem Lichtabstrahlelement abgestrahlte Licht zunächst das Isolierelement durchsetzt und anschließend in das optische Element eintritt.The insulating element is preferably arranged in such a way that the light emitted by the light-emitting element first passes through the insulating element and then enters the optical element.

Erfindungsgemäß ist das optische Element eine aus Kunststoff bestehende Linse. Das Isolierelement besteht vorzugsweise aus Glas.According to the invention, the optical element is a lens made of plastic. The insulating element is preferably made of glass.

Eine besonders raumsparende Ausgestaltung lässt sich erzielen, wenn das Isolierelement plattenförmig oder scheibenförmig gestaltet ist. Zudem lässt sich hierdurch erzielen, dass das Licht beim Durchtritt durch das Isolierelement besonders wenig beeinflusst wird.A particularly space-saving configuration can be achieved if the insulating element is designed in the form of a plate or disk. In addition, it can be achieved in this way that the light is influenced particularly little as it passes through the insulating element.

Ein besonders großer thermischer Widerstand zum optischen Element hin lässt sich erzielen, wenn die Lichtabgabeanordnung derart gestaltet ist, dass zwischen dem optischen Element und dem Isolierelement ein luftgefüllter Raum gebildet ist. Durch einen derartigen Luftraum oder Luftspalt lässt sich die Erwärmung des optischen Elements weitergehend reduzieren. Das Isolierelement bewirkt hierbei eine Verteilung der Wärme durch Wärmeleitung und der luftgefüllte Raum trägt zur Bildung eines besonders großen thermischen Widerstands bei.A particularly high thermal resistance towards the optical element can be achieved if the light emission arrangement is designed in such a way that an air-filled space is formed between the optical element and the insulating element. Through Such an air space or air gap can further reduce the heating of the optical element. The insulating element causes the heat to be distributed by thermal conduction and the air-filled space contributes to the formation of a particularly high thermal resistance.

Erfindungsgemäß ist das Isolierelement aus einem Stück bestehend ausgebildet. Auf diese Weise lässt sich eine besonders einfache Gestaltung erzielen. Außerdem lässt sich hierdurch erzielen, dass das Licht besonders wenig durch das Isolierelement geschwächt oder abgelenkt wird, so dass die Effizienz der Lichtabgabeanordnung besonders wenig beeinträchtigt ist.According to the invention, the insulating element consists of one piece. A particularly simple design can be achieved in this way. In addition, it can be achieved in this way that the light is weakened or deflected particularly little by the insulating element, so that the efficiency of the light-emitting arrangement is impaired particularly little.

Erfindungsgemäß weist die Lichtabgabeanordnung weiterhin ein Umfassungselement auf, das sowohl das optische Element als auch das Isolierelement staubdicht umfassend angeordnet ist. Insbesondere kann der luftgefüllte Raum von dem optischen Element, dem Isolierelement und dem Umfassungselement begrenzt gebildet sein. Auch auf diese Weise lässt sich praktisch ausschließen, dass sich ein Partikel auf der Lichteintrittsfläche des optischen Elements anlagert.According to the invention, the light-emitting arrangement also has an enclosing element which is arranged in a dust-tight manner enclosing both the optical element and the insulating element. In particular, the air-filled space can be delimited by the optical element, the insulating element and the enclosing element. In this way, too, it is practically impossible for a particle to accumulate on the light entry surface of the optical element.

Vorzugsweise ist das Umfassungselement derart gestaltet und angeordnet ist, dass es eine Lichteintrittsfläche zum Eintritt des Lichts in das optische Element begrenzt. Hierdurch ist eine besonders einfache Gestaltung der Lichtabgabeanordnung ermöglicht.The enclosing element is preferably designed and arranged in such a way that it delimits a light entry surface for the entry of the light into the optical element. This enables a particularly simple design of the light emission arrangement.

Erfindungsgemäß ist das Lichtabstrahlelement unmittelbar an dem Umfassungselement gehaltert angeordnet.According to the invention, the light-emitting element is mounted directly on the enclosing element.

Vorzugsweise besteht das Umfassungselement aus einem nicht lichtdurchlässigen Material, beispielsweise aus Kunststoff oder aus einem Metall. Auf diese Weise lässt sich erzielen, dass auf dem Weg des Lichts zwischen dem Isolierelement und dem optischen Element besonders wenig Licht aus der Lichtabgabeanordnung entweicht, so dass die Effizienz der Lichtabgabeanordnung gesteigert ist.The enclosing element preferably consists of a non-translucent material, for example plastic or metal. In this way it can be achieved that particularly little light escapes from the light-emitting arrangement on the path of the light between the insulating element and the optical element, so that the efficiency of the light-emitting arrangement is increased.

Vorzugsweise ist das Umfassungselement ein Reflektorelement. Hierdurch lässt sich die Anzahl der Bauteile der Lichtabgabeanordnung besonders gering halten.The enclosing element is preferably a reflector element. As a result, the number of components in the light-emitting arrangement can be kept particularly low.

Vorzugsweise ist das Umfassungselement aus einem Stück bestehend ausgebildet. Auch hierdurch lässt sich Anzahl der Bauteile gering halten. Alternativ kann das Umfassungselement aus mehreren Einzelteilen bestehend ausgebildet sein. Hierdurch lässt sich unter Umständen ein besonders einfacher Zusammenbau der Lichtabgabeanordnung ermöglichen.Preferably, the enclosing element is formed in one piece. This also allows the number of components to be kept low. Alternatively, the enclosing element can be made up of several individual parts. As a result, a particularly simple assembly of the light-emitting arrangement can be made possible under certain circumstances.

Gemäß einem weiteren Aspekt der Erfindung ist eine Leuchte vorgesehen, insbesondere in Form eines Strahlers, die eine erfindungsgemäße Lichtabgabeanordnung aufweist.According to a further aspect of the invention, a lamp is provided, in particular in the form of a spotlight, which has a light-emitting arrangement according to the invention.

Die Erfindung wird im Folgenden anhand eines Ausführungsbeispiels und mit Bezug auf die Zeichnungen näher erläutert. Es zeigen:

Fig. 1
eine perspektivische Skizze nach Art einer Explosionsdarstellung von Bauteilen einer erfindungsgemäßen Lichtabgabeanordnung,
Fig. 2
eine entsprechende Querschnittskizze und
Figuren 3 bis 5
Darstellungen zu Beschädigungen bekannter Lichtabgabeanordnungen.
The invention is explained in more detail below using an exemplary embodiment and with reference to the drawings. Show it:
1
a perspective sketch in the form of an exploded view of components of a light-emitting arrangement according to the invention,
2
a corresponding cross-sectional sketch and
Figures 3 to 5
Descriptions of damage to known light-emitting assemblies.

In Fig. 1 sind nach Art einer Explosionsdarstellung Bauteile einer erfindungsgemäßen Lichtabgabeanordnung skizziert, Fig. 2 zeigt eine entsprechende Querschnittdarstellung. Die Lichtabgabeanordnung umfasst ein Lichtabstrahlelement 1 zur Abstrahlung eines Lichts. In Fig. 2 ist das Lichtabstrahlelement 1 lediglich schematisch angedeutet. Insbesondere kann es sich bei dem Lichtabstrahlelement 1 um eine LED-Lichtquelle handeln, also beispielsweise um eine Platine, auf der eine LED angeordnet ist oder mehrere LEDs angeordnet sind.In 1 components of a light-emitting arrangement according to the invention are outlined in the form of an exploded view, 2 shows a corresponding cross-sectional view. The light-emitting arrangement comprises a light-emitting element 1 for emitting a light. In 2 the light-emitting element 1 is indicated only schematically. In particular, the light-emitting element 1 can be an LED light source, ie, for example, a circuit board on which an LED is arranged or a plurality of LEDs are arranged.

Weiterhin umfasst die Lichtabgabeanordnung ein optisches Element 2 zur Beeinflussung des von dem Lichtabstrahlelement 1 abgestrahlten Lichts. Insbesondere besteht das optische Element 2 aus einem Kunststoff. Bei dem optischen Element 2 handelt es sich erfindungsgemäß um eine Linse.The light-emitting arrangement also includes an optical element 2 for influencing the light emitted by the light-emitting element 1 . In particular, the optical element 2 consists of a plastic. According to the invention, the optical element 2 is a lens.

Vorzugsweise weist das optische Element 2 eine Lichteintrittsfläche 25 auf, die zum Eintritt des von dem Lichtabstrahlelement 1 abgestrahlten Lichts ausgestaltet ist. Wie im gezeigten Beispiel der Fall, kann die Lichteintrittsfläche 25 durch einen, dem Lichtabstrahlelement 1 zugewandten Oberflächenbereich des optischen Elements 2 gebildet sein.The optical element 2 preferably has a light entry surface 25 which is designed for entry of the light emitted by the light emitting element 1 . As is the case in the example shown, the light entry surface 25 can be formed by a surface area of the optical element 2 facing the light emitting element 1 .

Weiterhin umfasst die Lichtabgabeanordnung ein lichtdurchlässiges Isolierelement 3. Dabei ist das Isolierelement 3 in dem Weg des Lichts angeordnet und es besteht aus einem Material, das thermisch stabiler ist als dasjenige Material, aus dem das optische Element 2 besteht. Insbesondere ist die Gestaltung derart, dass das Isolierelement 3 derart angeordnet ist, dass das von dem Lichtabstrahlelement 1 abgestrahlte Licht zunächst das Isolierelement 3 durchsetzt und anschließend in das optische Element 2 eintritt.The light-emitting arrangement further comprises a light-transmitting insulating element 3. The insulating element 3 is arranged in the path of the light and is made of a material which is more thermally stable than the material from which the optical element 2 is made. In particular, the design is such that the insulating element 3 is arranged in such a way that the light emitted by the light-emitting element 1 first passes through the insulating element 3 and then enters the optical element 2 .

Vorzugsweise besteht das Isolierelement 3 aus Glas. Glas ist thermisch stabiler als Kunststoff.The insulating element 3 is preferably made of glass. Glass is thermally more stable than plastic.

Wie in den Figuren exemplarisch skizziert, ist das Isolierelement 3 vorzugsweise platten- bzw. scheibenförmig gestaltet. Außerdem besteht es lediglich aus einem Stück. Auf diese Weise ist der Durchtritt des Lichts besonders wenig beeinträchtigt.As sketched in the figures by way of example, the insulating element 3 is preferably designed in the form of a plate or disk. In addition, it consists of only one piece. In this way, the passage of light is particularly little affected.

Durch das Isolierelement 3 lässt sich zwischen dem thermisch anfälligeren optischen Element 2 einerseits und einem möglicherweise vorhandenen Partikel 9 andererseits eine thermisch vergleichsweise beständige "Zwischenschicht" bilden. Aufgrund der Lichtdurchlässigkeit des Isolierelements 3 lässt sich dabei erzielen, dass hierdurch die optischen Eigenschaften der Lichtabgabeanordnung, insbesondere deren lichttechnische Effizienz nicht nennenswert beeinträchtigt ist. Die Zwischenschicht bzw. das Isolierelement 3 verteilt sozusagen die Wärme, die sich im Fall des angelagerten Partikels 9 bei Lichteintrag durch Absorption ausbildet, durch Wärmeleitung und stellt einen thermischen Widerstand zwischen dem Partikel 9 und dem optischen Element 2 dar. Hierdurch wird die Temperatur des optischen Elements 2 entsprechend niedrig gehalten.The insulating element 3 allows a thermally comparatively stable “intermediate layer” to be formed between the thermally more susceptible optical element 2 on the one hand and a possibly present particle 9 on the other hand. Due to the transparency of the insulating element 3, it can be achieved that the optical properties of the light-emitting arrangement, in particular its photometric efficiency, are not significantly impaired. The intermediate layer or the insulating element 3, so to speak, distributes the heat that accumulates in the case of accumulated particle 9 forms upon entry of light by absorption, by thermal conduction and represents a thermal resistance between the particle 9 and the optical element 2. As a result, the temperature of the optical element 2 is kept correspondingly low.

Wenn die Wärmeleitfähigkeit des Isolierelements 3 richtungsunabhängig bzw. isotrop ist und dabei vergleichsweise groß ist, wird zwar die Wärme sehr gut verteilt, aber der senkrecht zu dem Isolierelement 3 bestehende thermische Widerstand, der durch das Isolierelement 3 gebildet ist, ist vergleichsweise gering. Ist andererseits die Wärmeleitfähigkeit des Isolierelements 3 vergleichsweise gering, ist der thermische Widerstand zwischen dem Partikel 9 und dem optischen Element 2 vergleichsweise groß, aber die Wärme wird nicht so gut verteilt. Diesem Effekt lässt sich wirkungsvoll begegnen, wenn die Lichtabgabeanordnung derart gestaltet ist, dass zwischen dem Isolierelement 3 und dem optischen Element 2 ein luftgefüllter Raum, bzw. eine Luftschicht gebildet ist (in den Figuren nicht gezeigt). In diesem Fall wird die Wärme innerhalb des Isoliermaterials 3 gut verteilt, aber der thermische Widerstand zwischen dem Partikel 9 und dem optischen Element 2 ist aufgrund der Luftschicht dennoch besonders groß. Der Abstand zwischen dem optischen Element 2 bzw. der Lichteintrittsfläche 25 des optischen Elements 2 einerseits und dem Isolierelement 3 andererseits beträgt hierzu vorzugsweise wenigstens 1 mm, besonders bevorzugt wenigstens 2 mm.If the thermal conductivity of the insulating element 3 is non-directional or isotropic and is comparatively high, the heat is distributed very well, but the thermal resistance perpendicular to the insulating element 3, which is formed by the insulating element 3, is comparatively low. On the other hand, when the thermal conductivity of the insulating member 3 is comparatively low, the thermal resistance between the particle 9 and the optical member 2 is comparatively large, but the heat is not distributed well. This effect can be counteracted effectively if the light emission arrangement is designed in such a way that an air-filled space or an air layer is formed between the insulating element 3 and the optical element 2 (not shown in the figures). In this case, the heat is well distributed within the insulating material 3, but the thermal resistance between the particle 9 and the optical element 2 is nevertheless particularly high due to the air layer. The distance between the optical element 2 or the light entry surface 25 of the optical element 2 on the one hand and the insulating element 3 on the other is preferably at least 1 mm, particularly preferably at least 2 mm.

Beim Beispiel, das in den Figuren 2 und 3 skizziert ist, umfasst die Lichtabgabeanordnung noch eine Streuscheibe 5, die zwischen dem optischen Element 2 und dem Isolierelement 3 angeordnet ist. Die Streuscheibe 5 kann aus Kunststoff bestehen. In diesem Fall stellt die Streuscheibe 5 selbst ein optisches Element dar, das durch das Isolierelement 3 in analoger Weise geschützt ist.In the example in the figures 2 and 3 is outlined, the light emission arrangement also includes a diffusing screen 5 which is arranged between the optical element 2 and the insulating element 3 . The lens 5 can be made of plastic. In this case, the diffusing screen 5 itself represents an optical element that is protected by the insulating element 3 in an analogous manner.

Wie im gezeigten Beispiel weiterhin der Fall, weist die Lichtabgabeanordnung außerdem noch ein Umfassungselement 4 auf, das derart ausgebildet und angeordnet ist, dass es sowohl das optische Element 2, als auch das Isolierelement 3 staubdicht umfasst. Auf diese Weise lässt sich praktisch verhindern, dass sich ungewollt ein Partikel auf der Lichteintrittsfläche 25 anlagert.As is also the case in the example shown, the light-emitting arrangement also has an enclosing element 4 which is designed and arranged in such a way that it encloses both the optical element 2 and the insulating element 3 in a dust-tight manner. In this way, it is practically possible to prevent a particle from accidentally accumulating on the light entry surface 25 .

Beispielsweise kann die Gestaltung derart sein, dass - wie in Fig. 2 angedeutet - das Umfassungselement 4 einen hohlzylindrischen Bereich B aufweist und das optische Element 2 eine zylindrische Außenfläche, mit der es den hohlzylindrischen Bereich B kontaktiert und ebenso das Isolierelement 3 eine zylindrische Außenfläche aufweist, mit der es den hohlzylindrischen Bereich B des Umfassungselements 3 kontaktiert. Vorzugsweise ist die Formgebung dabei jeweils kreiszylindrisch.For example, the design can be such that - as in 2 indicated - the enclosing element 4 has a hollow-cylindrical area B and the optical element 2 has a cylindrical outer surface with which it contacts the hollow-cylindrical area B and likewise the insulating element 3 has a cylindrical outer surface with which it contacts the hollow-cylindrical area B of the enclosing element 3. The shape is preferably circular-cylindrical in each case.

Dabei kann das Umfassungselement 4 derart gestaltet und angeordnet sein, dass es die Lichteintrittsfläche 25 des optischen Elements 2 begrenzt.In this case, the enclosing element 4 can be designed and arranged in such a way that it delimits the light entry surface 25 of the optical element 2 .

Ferner ist die Gestaltung weiterhin derart, dass das Lichtabstrahlelement 1 unmittelbar an dem Umfassungselement 4 gehaltert angeordnet ist.In addition, the configuration is such that the light-emitting element 1 is mounted directly on the enclosing element 4 .

Vorzugsweise besteht das Umfassungselement 4 aus einem nicht lichtdurchlässigen Material, beispielsweise aus Kunststoff oder aus einem Metall. Wie im gezeigten Beispiel der Fall, kann das Umfassungselement ein Reflektorelement sein, das vorzugsweise weiterhin zur Beeinflussung des Lichts ausgestaltet ist, insbesondere des Lichts, das aus dem optischen Element 2 wieder ausgetreten ist.Preferably, the enclosing element 4 consists of a non-translucent material, for example plastic or metal. As is the case in the example shown, the enclosing element can be a reflector element, which is preferably also designed to influence the light, in particular the light that has exited the optical element 2 again.

Das Umfassungselement 4 kann - wie skizziert - aus einem Stück gebildet sein, es kann aber auch aus mehreren Stücken bestehen.As outlined, the enclosing element 4 can be formed from one piece, but it can also consist of several pieces.

Beim gezeigten Ausführungsbeispiel weist die Lichtabgabeanordnung noch ein ringförmiges Reflektorelement 8, beispielsweise in Form einer Reflektorfolie, auf, das auf der, dem optischen Element 2 gegenüberliegenden Seite des Isolierelements 3 angeordnet ist.In the exemplary embodiment shown, the light-emitting arrangement also has an annular reflector element 8 , for example in the form of a reflector foil, which is arranged on the side of the insulating element 3 opposite the optical element 2 .

Besonders bevorzugt bildet die Lichtabgabeanordnung einen Bestandteil einer Leuchte, insbesondere eines Strahlers. Insbesondere kann dabei die Leuchte für eine Lichtabgabe nach unten ausgebildet sein.The light-emitting arrangement particularly preferably forms part of a lamp, in particular a spotlight. In particular, the lamp can be designed to emit light downwards.

Claims (10)

  1. Light-emitting arrangement, comprising
    - a light-emitting element (1) for emitting a light, and
    - an optical element (2) for influencing the light,
    - a translucent insulating element (3) arranged in the path of light, wherein the insulating element (3) is formed from a single piece and consists of a more thermally stable material than the optical element (2),
    - a surrounding element (4), wherein the surrounding element (4) is arranged so as to surround both the optical element (2) and the insulating element (3) in a dust-tight manner, wherein the optical element (2) is a lens consisting of plastic and the light-emitting element (1) is arranged directly on the surrounding element (4).
  2. The light-emitting arrangement according to claim 1,
    in which the insulating element (3) is arranged such that the light emitted by the light-emitting element (1) first penetrates the insulating element (3) and then enters the optical element (2).
  3. The light-emitting arrangement according to any one of the preceding claims,
    in which the insulating element (3) consists of glass.
  4. The light-emitting arrangement according to any one of the preceding claims,
    in which the insulating element (3) is designed so as to be plate-shaped or disc-shaped.
  5. The light-emitting arrangement according to any one of the preceding claims,
    in which an air-filled space is formed between the optical element (2) and the insulating element (3).
  6. The light-emitting arrangement according to any one of the preceding claims,
    in which the surrounding element (4) is designed and arranged so as to limit a light entry surface (25) for the entry of the light into the optical element (2).
  7. The light-emitting arrangement according to any one of the preceding claims,
    in which the surrounding element (4) consists of a non-translucent material, for example plastic or a metal.
  8. The light-emitting arrangement according to any one of the preceding claims,
    in which the surrounding element (4) is a reflector element.
  9. The light-emitting arrangement according to any one of the preceding claims,
    in which the surrounding element (4) is formed from a single piece or is formed from a plurality of individual parts.
  10. A lamp, in particular in the form of a radiator,
    comprising a light-emitting arrangement according to any one of the preceding claims.
EP13736916.1A 2012-07-17 2013-07-15 Light-emitting assembly and lamp having a light-emitting assembly Active EP2875287B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202012102644U DE202012102644U1 (en) 2012-07-17 2012-07-17 Light-emitting device and luminaire with a light-emitting device
PCT/EP2013/064878 WO2014012875A1 (en) 2012-07-17 2013-07-15 Light-emitting assembly and lamp having a light-emitting assembly

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EP2875287A1 EP2875287A1 (en) 2015-05-27
EP2875287B1 true EP2875287B1 (en) 2023-03-29

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US (1) US9810415B2 (en)
EP (1) EP2875287B1 (en)
CN (1) CN104412040B (en)
DE (1) DE202012102644U1 (en)
WO (1) WO2014012875A1 (en)

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Publication number Publication date
US9810415B2 (en) 2017-11-07
EP2875287A1 (en) 2015-05-27
WO2014012875A1 (en) 2014-01-23
DE202012102644U1 (en) 2013-10-21
CN104412040B (en) 2018-06-22
CN104412040A (en) 2015-03-11
US20150176827A1 (en) 2015-06-25

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