EP2875287B1 - Lichtabgabeanordnung und leuchte mit einer lichtabgabeanordnung - Google Patents

Lichtabgabeanordnung und leuchte mit einer lichtabgabeanordnung 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
Authority
EP
European Patent Office
Prior art keywords
light
emitting
optical element
insulating
emitting arrangement
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
EP13736916.1A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2875287A1 (de
Inventor
Piere Angelo FAVAROLO
Stefan KORNHAAS
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.)
Zumtobel Lighting GmbH Austria
Original Assignee
Zumtobel Lighting GmbH Austria
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 Zumtobel Lighting GmbH Austria filed Critical Zumtobel Lighting GmbH Austria
Publication of EP2875287A1 publication Critical patent/EP2875287A1/de
Application granted granted Critical
Publication of EP2875287B1 publication Critical patent/EP2875287B1/de
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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.

Landscapes

  • 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)
EP13736916.1A 2012-07-17 2013-07-15 Lichtabgabeanordnung und leuchte mit einer lichtabgabeanordnung Active EP2875287B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202012102644U DE202012102644U1 (de) 2012-07-17 2012-07-17 Lichtabgabeanordnung und Leuchte mit einer Lichtabgabeanordnung
PCT/EP2013/064878 WO2014012875A1 (de) 2012-07-17 2013-07-15 Lichtabgabeanordnung und leuchte mit einer lichtabgabeanordnung

Publications (2)

Publication Number Publication Date
EP2875287A1 EP2875287A1 (de) 2015-05-27
EP2875287B1 true EP2875287B1 (de) 2023-03-29

Family

ID=48790467

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13736916.1A Active EP2875287B1 (de) 2012-07-17 2013-07-15 Lichtabgabeanordnung und leuchte mit einer lichtabgabeanordnung

Country Status (5)

Country Link
US (1) US9810415B2 (zh)
EP (1) EP2875287B1 (zh)
CN (1) CN104412040B (zh)
DE (1) DE202012102644U1 (zh)
WO (1) WO2014012875A1 (zh)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020067542A1 (en) * 2000-12-06 2002-06-06 Shinji Okamori Uv-absorbing filter and optical apparatus incorporating the same

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3120352A (en) 1960-12-31 1964-02-04 Akita Tadayoshi Spot light unit
DE1201278B (de) * 1962-05-04 1965-09-23 Quarzlampen Gmbh Operationsleuchte
US3302019A (en) * 1964-09-29 1967-01-31 Smithcraft Corp Incandescent light fixture improvements
US3725697A (en) 1969-10-03 1973-04-03 Holophane Co Inc Luminaire comprising means for reducing temperature of exterior refractor
DE4305633A1 (de) * 1992-02-24 1993-10-07 Valeo Vision Verbesserung an Linsen-Scheinwerfern
FR2687761B1 (fr) 1992-02-24 1999-04-02 Valeo Vision Projecteur comportant des moyens perfectionnes d'arret de certaines parties du rayonnement, notamment pour vehicule automobiles.
US5703374A (en) * 1996-08-08 1997-12-30 Actinic Systems, Inc. Telecentric NUV-DUV irradiator for out-of-contact exposure of large substrates
WO1999064783A1 (en) 1998-06-11 1999-12-16 Spectra Lighting Pty. Ltd. An in ground light
US6527422B1 (en) * 2000-08-17 2003-03-04 Power Signal Technologies, Inc. Solid state light with solar shielded heatsink
DE102004018424B4 (de) * 2004-04-08 2016-12-08 Docter Optics Se Verfahren zur Herstellung einer Linse
FR2898403B1 (fr) 2006-03-07 2012-12-14 Valeo Vision Lentille pour module optique de dispositif d'eclairage pour vehicule automobile
DE102008010029B4 (de) * 2008-02-20 2017-11-16 Hella Kgaa Hueck & Co. Scheinwerfer für Fahrzeuge
TWM366647U (en) * 2009-05-15 2009-10-11 Hui-Yu Chen Water proof LED lamp

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020067542A1 (en) * 2000-12-06 2002-06-06 Shinji Okamori Uv-absorbing filter and optical apparatus incorporating the same

Also Published As

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

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