EP2112424B1 - Light emitting device for a domestic appliance - Google Patents

Light emitting device for a domestic appliance Download PDF

Info

Publication number
EP2112424B1
EP2112424B1 EP08008046.8A EP08008046A EP2112424B1 EP 2112424 B1 EP2112424 B1 EP 2112424B1 EP 08008046 A EP08008046 A EP 08008046A EP 2112424 B1 EP2112424 B1 EP 2112424B1
Authority
EP
European Patent Office
Prior art keywords
light
light emitting
household appliance
emitting device
approx
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
EP08008046.8A
Other languages
German (de)
French (fr)
Other versions
EP2112424A1 (en
Inventor
Christian Dobler
Josef Irlbacher
Josef Nothaas
Johann Turban
Georg Wilhelm
Günter Zühlke
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.)
emz Hanauer GmbH and Co KGaA
Original Assignee
emz Hanauer GmbH and Co KGaA
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 emz Hanauer GmbH and Co KGaA filed Critical emz Hanauer GmbH and Co KGaA
Priority to EP08008046.8A priority Critical patent/EP2112424B1/en
Priority to PCT/EP2009/003050 priority patent/WO2009130055A1/en
Publication of EP2112424A1 publication Critical patent/EP2112424A1/en
Application granted granted Critical
Publication of EP2112424B1 publication Critical patent/EP2112424B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • F21V5/008—Combination of two or more successive refractors along an optical axis
    • 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
    • F21V5/048—Refractors for light sources of lens shape the lens being a simple lens adapted to cooperate with a point-like source for emitting mainly in one direction and having an axis coincident with the main light transmission direction, e.g. convergent or divergent lenses, plano-concave or plano-convex lenses
    • 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
    • F21V17/00—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages
    • F21V17/10—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening
    • F21V17/16—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening by deformation of parts; Snap action mounting
    • F21V17/164—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening by deformation of parts; Snap action mounting the parts being subjected to bending, e.g. snap joints
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2111/00—Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00
    • 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]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D27/00—Lighting arrangements

Definitions

  • the present invention relates to a light emitting device for a household appliance.
  • a household appliance light emitting device is from the US-A-3,228,288 known.
  • the object of the invention is to provide a household appliance light emitting device of the type mentioned, which is easy to manufacture and assemble.
  • a household appliance light emitting device solving this problem is described in claim 1.
  • the light condensing means generates a convergent or divergent bundle of light rays.
  • the light bundling device concentrates the rays emitted by a light-emitting diode into a bundle which has a substantially lower angular spectrum than the light emitted by the light-emitting diode
  • the light bundling device is preferably a light parallelizing device.
  • the light beam with the second angular spectrum is preferably a substantially parallel light beam.
  • the light beam having the second angular spectrum may have an aperture angle (ie, an angular deviation from parallelism) less than or equal to about ⁇ 10 °, about ⁇ 5 °, preferably less than or equal to ⁇ 2.5 °, more preferably about ⁇ 1 °, and most preferably less than equal to about ⁇ 0.5 °.
  • the intensity of the light beam can be 50% of the maximum intensity. This is due to the fact that the intensity of the light emitting diode at the edge of the first angle spectrum can amount to 50% of the maximum intensity. This depends on the definition of the angle spectrum or opening angle of the light-emitting diode.
  • the light divider can be spaced from the light bundling device without significant intensity losses occurring. Since the light beam with the second angular spectrum passes a distance between the light bundling device and the light divergence device, no coupling-in and coupling-out losses occur, as occur, for example, with optical fibers.
  • the light-emitting diode and the light-bundling device can be arranged close to a fixing region of the light-emitting device which is opposite to the light-diverging device. This has the advantage that no or only a few additional plastic and metal components are required in order to fix the light-emitting diode, for example, placed on a board on the mounting area.
  • the light emerging from the light-emitting diode is converted by the light bundling device into a light beam with the second, smaller and preferably parallel angular spectrum, which extends over a distance to the relatively distant light divergence device, where it is converted into a divergent light beam and exits from the light-emitting device.
  • the light divergence device is formed integrally with a housing.
  • the route may be without a light guide, in which the light beam extends with the second, smaller and preferably parallel angle spectrum.
  • the cross-sectional area of the light beam having a second angular spectrum may be larger than the luminous area of the chip of the light-emitting diode.
  • the light emitting diode comprises a lens, wherein the first angular spectrum of the light emerging from the light emitting diode has a range of about 20 ° to about 30 °, preferably about 50 ° to about 70 °, most preferably about 110 ° to about 130 °.
  • An angle spectrum can be defined such that the intensity of the light at the edge of the angle spectrum is about 50% of the maximum intensity.
  • a large angular spectrum of the light beam emitted by the light-emitting diode permits greater assembly tolerances between the light-bundling device, the light-emitting diode, the chip in the light-emitting diode, the lens in the light-emitting diode, the solder connection between the light-emitting diode and the circuit board, and between the circuit board and the fastening region the quality of the light beam with the second, smaller and preferably parallel angle spectrum is excessively impaired.
  • this light emitting device allows easy wiring because the board is located near the mounting area from which power is supplied to the light emitting device.
  • the light emitting diode is an SMD light emitting diode which is fixed on a circuit board by soldering.
  • the light-emitting device according to the invention is relatively tolerant of manufacturing tolerances.
  • SMD LEDs typically have a large angular spectrum, i. a large opening angle, between about 50 ° and about 120 °.
  • the second angular spectrum may be about ⁇ 15 °, preferably about ⁇ 10 °, more preferably about ⁇ 5 °, most preferably about ⁇ 1.5 °.
  • the household appliance light emitting device may comprise a plurality of light emitting diodes, wherein the light condensing device converts the light of the plurality of light emitting diodes into a light beam having the second, smaller and preferably parallel angular spectrum. This results in a particularly bright and / or a redundant light emitting device for a household appliance.
  • the light lobes of the light-emitting diodes preferably overlap when they impinge on the light-bundling device.
  • the light bundling device is a converging lens, in particular a Fresnel lens.
  • the light divergence device can be a scattering lens or a diffuser.
  • the distance between the light bundling device and the light divergence device may be greater than or equal to approximately 10 mm, preferably greater than or equal to approximately 20 mm, and most preferably greater than or equal to approximately 30 mm.
  • the cross section of the light beam having the second, smaller and preferably parallel angular spectrum is about 3 to about 20 mm, preferably about 5 to about 15 mm, most preferably about 8 to about 12 mm.
  • the angular spectrum of the divergent light beam exiting the light emitting device is about 25 ° to about 35 °, preferably about 40 ° to about 50 °, preferably about 50 ° to about 70 °, preferably about 80 ° to about 100 °, most preferably about 110 ° to about 130 °.
  • the light bundling device can be spatially fixed relative to the board. As a result, the tolerance chain described above for the light beam with the second, smaller and preferably parallel angle spectrum reduces to the Positional tolerance of the chip of the LED, the LED of the light emitting diode, the LED to the board and the board to Lichtbündelungs observed.
  • the light bundling device may be attached to the circuit board.
  • the circuit board can have recesses into which projections of the light bundling device engage.
  • the recesses may be located at the edge of the board or be formed as openings.
  • the projections of the light bundling device may be arms. On the arms locking means may be formed.
  • the light-bundling device can be spatially fixed relative to a housing of the light-emitting diode, in particular in that the light-bundling device has a region which is complementary to the housing of the light-emitting diode and fixes the light-bundling device spatially relative to the light-emitting diode.
  • the light bundling device may have a housing which has a recess complementary to the housing of the LED at its region facing the printed circuit board.
  • the housing of the light concentrator can be positioned over the housing of the LED, and the housing of the LED spatially fixes the housing of the light concentrator.
  • the complementary region can rest against the entire housing of the light-emitting diode or it can rest only at four points or two corners on the housing of the light-emitting diode. As a result, the tolerances caused by the board can be eliminated.
  • the board may be arranged on the housing of the household appliance light emitting device so that the position of the board in the optical axis direction of the household appliance light emitting device and / or perpendicular to the optical axis direction of the household appliance light emitting device is determined by the housing of the household appliance light emitting device.
  • the position of the board and thus the position of the light emitting diode including the chip and the lens and the position of the light bundling device to the housing of the household appliance light emitting device can be relatively accurately determined.
  • the tolerances of the tolerance chain can be further reduced, resulting in a light output subject to relatively low copy scatters.
  • the housing of the household appliance light emitting device may have a first region with a first cross section and a second region with a second cross section, wherein the first region has a smaller cross section than the second region, a stepped transition between the first and second area is present, the board is set from the second area perpendicular to the optical axis of the household appliance light emitting device and the stepped transition determines the board in the optical axis direction.
  • the light divergence device is formed integrally with the housing of the household appliance light emitting device. This embodiment is particularly suitable for a casting process.
  • the board may be arranged on the lid.
  • the lid may be fastened to the housing, for example by means of a snap-in technique.
  • the lens may be disposed on the board as previously described.
  • size deviations of the board which may be, for example ⁇ 0.15 mm, can be compensated because the board is not applied to the housing. The size tolerance of the board can thus not lead to a jamming of the board in the housing, not to a deformation of the housing and not to a game of the board in the housing.
  • the light emitting device for a household appliance described below may be used to indicate to a user an operating state of the household appliance such as a washing machine, a dishwasher, a cooker, a refrigerator, and the like. Furthermore, the light emitting device can be used to illuminate the interior and / or the environment of the household appliance.
  • the light emitting device has a housing 2, in which a circuit board 12 is arranged with a light emitting diode 10.
  • the household appliance light emitting device is closed with a lid 30.
  • the household appliance light emitting device can by means of the housing 2 or the lid 30 attached to a household appliance, that is spatially determined to be.
  • a chip (not shown) of the light emitting diode 10 emits light which is brought by a lens 16 of the light emitting diode 10 in a predetermined angular spectrum, for example about 120 °.
  • the angle spectrum of the light-emitting diode can be defined such that the intensity at the edge of the angle spectrum is 50% of the maximum intensity.
  • the condenser lens 6 operates as a light bundling device or light parallelizing device.
  • the converging lens 6 produces a substantially parallel light beam 8.
  • the intensity spectrum of the substantially parallel light beam may be defined such that the intensity at the edge of the angular spectrum is 50% of the maximum intensity.
  • This substantially parallel light beam 8 passes through the hollow housing 2.
  • the substantially parallel light beam 8 impinges on a light divergence device 4.
  • the substantially parallel light beam 8 extends over a distance S, which is about as long as the diameter of the beam in this area or longer.
  • the light divergence device can be for example a scattering lens or a diffuser.
  • substantially parallel light beam 8 may include a light beam which also converges or diverges somewhat due to, for example, manufacturing and / or assembly tolerances.
  • the substantially parallel light beam may converge or diverge by about ⁇ 10 °.
  • the opening angle of the light beam 22 emerging from the light divergence device can be for example about 45 °.
  • the tolerances are relatively high in such a low-cost mass-produced article.
  • the opening angle of the light beam emerging from the light divergence device can be between 25 ° and 180 °. Such opening angles can be achieved, for example, by a convex diffuser or by a convex diffusing lens.
  • the converging lens 6 is fixed by means of arms 24 with locking lugs 28 on the circuit board 12.
  • the board 12 may have openings 34 (see FIG. 2 ), through which the arms 24 extend.
  • the circuit board 12 has an outer diameter corresponding to the inner diameter of the housing 2 of the light emitting device, so that the housing 2, the board 12 also defines in its position perpendicular to the optical axis of the light emitting device.
  • FIG. 2 shows a plan view of the board 12.
  • the light-emitting diode 10 is arranged on the board 12.
  • the board 12 has openings 34 through which an arm 24 can pass.
  • the converging lens 6 is thus aligned relatively accurately with the board 12.
  • the light-emitting diode 10 if an SMD LED is used, centered on the designated pads (pad). This results in a cost-effective manner a comparatively accurate alignment of the optical axis of the light emitting diode with the optical axis of the converging lens 6. This increases the quality of the light output of Haushals réellelichtabgabe worn.
  • FIG. 3 shows a broken section in the direction of the optical axis of the light emitting device through a part of the housing 2 and the circuit board 12 of the light emitting device.
  • the housing of the light emitting device has a first region 2a and a second region 2b.
  • the first region 2a has a smaller cross section than the second region 2b.
  • the cross section (perpendicular to the optical axis of the light emitting device) of the housing has a circular, elliptical, rectangular, polygonal shape.
  • the transition between the first region 2 a and the second region 2 b of the housing 2 is step-shaped.
  • the stepped transition determines the position of the board 12 in the direction of the optical axis of the light emitting device.
  • the inner diameter of the second region 2b defines the position of the circuit board 12 perpendicular to the optical axis of the light emitting device.
  • the light divergence device 4 is formed integrally with or disposed on the first region 2a. Consequently, the housing 2 with the two areas 2a and 2b has no undercuts, so that it can be produced by a casting technique, for example by injection molding.
  • the inner diameter of the second region 2b allows a relatively accurate alignment of the circuit board 12 and thus the optical axis of the light-emitting diode 10 and the condenser lens 6, as previously with reference to FIG FIGS. 1 and 2 has been described.
  • the tolerance chain which results from the addition of the production and / or position tolerances of the light divergence device 4, the housing 2, the circuit board 12, the LED 10 including chip and lens 16 to the circuit board and the converging lens 6 to the circuit board, can be reduced.
  • the circuit board 12 is pressed by means of a pressing element 36 against the stepped portion of the housing 2 of the light emitting device.
  • a pressing element 36 formed integrally with the lid 30.
  • the cover 30 can engage on the housing 2 by means of a latching lug.
  • the board may be located on the lid.
  • the lid may be fastened to the housing, for example by means of a snap-in technique.
  • the lens may be disposed on the board as previously described.
  • size deviations of the board which may be, for example ⁇ 0.15 mm, can be compensated because the board is not applied to the housing.
  • the size tolerance of the board can thus not lead to a jamming of the board in the housing, not to a deformation of the housing and not to a game of the board in the housing.
  • This embodiment has a simpler structure and can be mounted more easily. In this embodiment, the wiring is easier to implement.
  • the light-emitting device according to the invention has the advantage that it can be produced from a few parts, which can be produced inexpensively in a casting process. Furthermore, the light emitting device according to the invention is constructed so that the effects of manufacturing tolerances are minimized. Since the light-emitting diode 10 emits a light beam 18 with a relatively large aperture angle from the lens 16, the positional tolerance of the light emitting diode on the circuit board 12 and the positional tolerance of the circuit board 12 with respect to the housing 2 have only a relatively small effect on the quality of the light emitted by the light emitting device light beam.
  • the term position tolerance here also applies to a tilting of the light emitting diode 10, the board, the chip of the light emitting diode and / or the lens 16 of the light emitting diode. Due to the large opening angle of the emerging from the light emitting diode 10 light beam 18, the light emitting device is tolerant to tilting tolerances. Even with a tilting and / or displacement of the light-emitting diode 10, the circuit board 12 of the chip and / or the lens 16 of the light emitting diode, a sufficiently broad substantially parallel light beam is produced, which impinges on the light divider 4.
  • the condenser lens 6 does not necessarily have to generate a substantially parallel light beam.
  • the light beam generated by the condenser lens 6 may converge or diverge.
  • the light beam 22 generated by the divergence device 4 has a significantly greater divergence than the light beam 8 entering the divergence device 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Led Device Packages (AREA)

Description

Die vorliegende Erfindung betrifft eine Lichtabgabeeinrichtung für ein Haushaltsgerät. Eine solche Haushaltsgerätlichtabgabeeinrichtung ist aus der US-A-3,228,288 bekannt.The present invention relates to a light emitting device for a household appliance. Such a household appliance light emitting device is from the US-A-3,228,288 known.

Aufgabe der Erfindung ist es, eine Haushaltsgerätlichtabgabeeinrichtung der eingangs genannten Art bereitzustellen, die einfach herzustellen und zu montieren ist.The object of the invention is to provide a household appliance light emitting device of the type mentioned, which is easy to manufacture and assemble.

Eine diese Aufgabe lösende Haushaltsgerätlichtabgabeeinrichtung ist im Patentanspruch 1 beschrieben.A household appliance light emitting device solving this problem is described in claim 1.

Die abhängigen Ansprüche beschreiben vorteilhafte Ausgestaltungen der Haushaltsgerätlichtabgabeeinrichtung.The dependent claims describe advantageous embodiments of the household appliance light emitting device.

Es ist möglich, dass die Lichtbündelungseinrichtung ein konvergentes oder divergentes Bündel von Lichtstrahlen erzeugt. Die Lichtbündelungseinrichtung bündelt die von einer Leuchtdiode abgegebenen Strahlen in ein Bündel, das ein wesentlich niedrigeres Winkelspektrum als das von der Leuchtdiode abgegebene Licht aufweistIt is possible that the light condensing means generates a convergent or divergent bundle of light rays. The light bundling device concentrates the rays emitted by a light-emitting diode into a bundle which has a substantially lower angular spectrum than the light emitted by the light-emitting diode

Die Lichtbündelungseinrichtung ist vorzugsweise eine Lichtparallelisierungseinrichtung. Der Lichtstrahl mit dem zweiten Winkelspektrum ist vorzugsweise ein im Wesentlichen paralleler Lichtstrahl. Der Lichtstrahl mit dem zweiten Winkelspektrum kann einen Öffnungswinkel (d.h. eine Winkelabweichung von der Parallelität) kleiner gleich etwa ±10°, etwa ±5°, vorzugsweise von etwa kleiner gleich ±2,5°, vorzugsweise von etwa ±1° und höchstvorzugsweise von kleiner gleich etwa ±0,5° haben. Am Rand des Winkelspektrums kann die Intensität des Lichtstrahls 50% der Maximalintensität betragen. Dies ist darauf zurückzuführen, dass die Intensität der Leuchtdiode am Rand des ersten Winkelspektrums 50% der Maximalintensität betragen kann. Dies hängt von der Definition des Winkelspektrums bzw. Öffnungswinkels der Leuchtdiode ab.The light bundling device is preferably a light parallelizing device. The light beam with the second angular spectrum is preferably a substantially parallel light beam. The light beam having the second angular spectrum may have an aperture angle (ie, an angular deviation from parallelism) less than or equal to about ± 10 °, about ± 5 °, preferably less than or equal to ± 2.5 °, more preferably about ± 1 °, and most preferably less than equal to about ± 0.5 °. At the edge of the angle spectrum, the intensity of the light beam can be 50% of the maximum intensity. This is due to the fact that the intensity of the light emitting diode at the edge of the first angle spectrum can amount to 50% of the maximum intensity. This depends on the definition of the angle spectrum or opening angle of the light-emitting diode.

Da der Lichtstrahl mit dem zweiten Winkelspektrum von der Lichtbündelungseinrichtung zur Lichtdivergenzeinrichtung geleitet wird und da das zweite Winkelspektrum kleiner als das erste Winkelspektrum ist, kann die Lichtdivergenzeinrichtung von der Lichtbündelungseinrichtung beabstandet sein, ohne dass wesentliche Intensitätsverluste auftreten. Da der Lichtstrahl mit dem zweiten Winkelspektrum eine Strecke zwischen der Lichtbündelungseinrichtung und der Lichtdivergenzeinrichtung passiert, treten keine Einkoppel- und Auskoppelverluste auf, wie sie beispielsweise bei Lichtleitern auftreten.Since the light beam having the second angular spectrum is guided by the light bundling device to the light divider and since the second angular spectrum is smaller than the first angular spectrum, the light divider can be spaced from the light bundling device without significant intensity losses occurring. Since the light beam with the second angular spectrum passes a distance between the light bundling device and the light divergence device, no coupling-in and coupling-out losses occur, as occur, for example, with optical fibers.

Die Leuchtdiode und die Lichtbündelungseinrichtung können nahe an einem der Lichtdivergenzeinrichtung entgegengesetzten Befestigungsbereich der Lichtabgabeeinrichtung angeordnet sein. Dies hat den Vorteil, dass keine oder nur wenige zusätzliche Kunststoff- und Metallbauteile erforderlich sind, um die beispielsweise auf einer Platine platzierte Leuchtdiode am Befestigungsbereich zu befestigen. Das aus der Leuchtdiode austretende Licht wird durch die Lichtbündelungseinrichtung in einen Lichtstrahl mit dem zweiten, kleineren und vorzugsweise parallelen Winkelspektrum gewandelt, der über eine Strecke zu der relativ weit entfernten Lichtdivergenzeinrichtung verläuft, wo er in einen divergenten Lichtstrahl gewandelt wird und aus der Lichtabgabeeinrichtung austritt.The light-emitting diode and the light-bundling device can be arranged close to a fixing region of the light-emitting device which is opposite to the light-diverging device. This has the advantage that no or only a few additional plastic and metal components are required in order to fix the light-emitting diode, for example, placed on a board on the mounting area. The light emerging from the light-emitting diode is converted by the light bundling device into a light beam with the second, smaller and preferably parallel angular spectrum, which extends over a distance to the relatively distant light divergence device, where it is converted into a divergent light beam and exits from the light-emitting device.

Die Lichtdivergenzeinrichtung ist integral mit einem Gehäuse ausgebildet. Innerhalb des Gehäuses kann sich die Strecke ohne Lichtleiter befinden, in dem der Lichtstrahl mit dem zweiten, kleineren und vorzugsweise parallelen Winkelspektrum verläuft.The light divergence device is formed integrally with a housing. Within the housing, the route may be without a light guide, in which the light beam extends with the second, smaller and preferably parallel angle spectrum.

Die Querschnittsfläche des Lichtstrahls mit einem zweiten Winkelspektrum kann größer als die leuchtende Fläche des Chips der Leuchtdiode sein. Dadurch wirken sich Positions- und Winkeltoleranzen zwischen der Lichtbündelungseinrichtung, der Leuchtdiode, des Chips in der Leuchtdiode, einer Lötverbindung zwischen der Leuchtdiode und der Platine sowie Montagetoleranzen zwischen der Platine und dem Befestigungsbereich weniger stark auf die Position und Orientierung des Lichtstrahls mit dem zweiten, kleineren und vorzugsweise parallelen Winkelspektrum aus. Typischerweise weist die Leuchtdiode eine Linse auf, wobei das erste Winkelspektrum des aus der Leuchtdiode austretenden Lichts einen Bereich von etwa 20° bis etwa 30°, vorzugsweise etwa 50° bis etwa 70°, höchstvorzugsweise etwa 110° bis etwa 130° aufweist. Ein Winkelspektrum kann dabei derart definiert werden, dass die Intensität des Lichtes am Rand des Winkelspektrums etwa 50% der Maximalintensität beträgt. Ein großes Winkelspektrum des von der Leuchtdiode abgegebenen Lichtstrahls erlaubt größere Montagetoleranzen zwischen der Lichtbündelungseinrichtung, der Leuchtdiode, dem Chip in der Leuchtdiode, der Linse in der Leuchtdiode, der Lötverbindung zwischen der Leuchtdiode und der Platine sowie zwischen der Platine und dem Befestigungsbereich, ohne dass dadurch die Qualität des Lichtstrahls mit dem zweiten, kleineren und vorzugsweise parallelen Winkelspektrum zu stark beeinträchtigt wird.The cross-sectional area of the light beam having a second angular spectrum may be larger than the luminous area of the chip of the light-emitting diode. As a result, position and angle tolerances between the light bundling device, the light-emitting diode, the chip in the light-emitting diode, a solder connection between the light-emitting diode and the board, and assembly tolerances between the board and the fastening region have less effect on the position and orientation of the light beam with the second, smaller one and preferably parallel angle spectrum. Typically, the light emitting diode comprises a lens, wherein the first angular spectrum of the light emerging from the light emitting diode has a range of about 20 ° to about 30 °, preferably about 50 ° to about 70 °, most preferably about 110 ° to about 130 °. An angle spectrum can be defined such that the intensity of the light at the edge of the angle spectrum is about 50% of the maximum intensity. A large angular spectrum of the light beam emitted by the light-emitting diode permits greater assembly tolerances between the light-bundling device, the light-emitting diode, the chip in the light-emitting diode, the lens in the light-emitting diode, the solder connection between the light-emitting diode and the circuit board, and between the circuit board and the fastening region the quality of the light beam with the second, smaller and preferably parallel angle spectrum is excessively impaired.

Ferner erlaubt diese Lichtabgabeeinrichtung eine einfache Verkabelung, da die Platine in der Nähe des Befestigungsbereichs angeordnet ist, von wo der Lichtabgabeeinrichtung Strom zugeführt wird.Further, this light emitting device allows easy wiring because the board is located near the mounting area from which power is supplied to the light emitting device.

Vorzugsweise ist die Leuchtdiode eine SMD-Leuchtdiode, die auf einer Platine durch Löten befestigt ist. Dies ist möglich, da, wie zuvor erwähnt, die erfindungsgemäße Lichtabgabeeinrichtung relativ tolerant gegenüber Herstellungstoleranzen ist. Ferner erfolgt je nach Löttechnik ein Zentrieren der SMD-Leuchtdiode auf den Anschlüssen der Platine. SMD-Leuchtdioden weisen typischerweise ein großes Winkelspektrum, d.h. einen großen Öffnungswinkel, zwischen etwa 50° und etwa 120° auf. Folglich ist es für die beschriebene Anwendung ausreichend, wenn die Lichtbündelungseinrichtung einen divergenten oder konvergenten Lichtstrahl mit dem zweiten Winkelspektrum erzeugt. Das zweite Winkelspektrum kann etwa ±15°, bevorzugt etwa ±10°, mehr bevorzugt etwa ±5°, höchst bevorzugt etwa ±1,5° betragen.Preferably, the light emitting diode is an SMD light emitting diode which is fixed on a circuit board by soldering. This is possible since, as previously mentioned, the light-emitting device according to the invention is relatively tolerant of manufacturing tolerances. Furthermore, depending on the soldering technique, a centering of the SMD light emitting diode on the terminals of the board. SMD LEDs typically have a large angular spectrum, i. a large opening angle, between about 50 ° and about 120 °. Thus, for the described application, it is sufficient for the light concentrator to produce a divergent or convergent light beam having the second angular spectrum. The second angular spectrum may be about ± 15 °, preferably about ± 10 °, more preferably about ± 5 °, most preferably about ± 1.5 °.

Die Haushaltsgerätlichtabgabeeinrichtung kann eine Mehrzahl von Leuchtdioden aufweisen, wobei die Lichtbündelungseinrichtung das Licht der Mehrzahl von Leuchtdioden in einen Lichtstrahl mit dem zweiten, kleineren und vorzugsweise parallelen Winkelspektrum wandelt. Dadurch entsteht eine besonders lichtstarke und/oder eine redundante Lichtabgabeeinrichtung für ein Haushaltsgerät. Die Lichtkeulen der Leuchtdioden überlappen sich vorzugsweise, wenn sie an der Lichtbündelungseinrichtung auftreffen.The household appliance light emitting device may comprise a plurality of light emitting diodes, wherein the light condensing device converts the light of the plurality of light emitting diodes into a light beam having the second, smaller and preferably parallel angular spectrum. This results in a particularly bright and / or a redundant light emitting device for a household appliance. The light lobes of the light-emitting diodes preferably overlap when they impinge on the light-bundling device.

Die Lichtbündelungseinrichtung ist eine Sammellinse, insbesondere eine Fresnel-Linse. Die Lichtdivergenzeinrichtung kann eine Streulinse oder ein Diffusor sein. Der Abstand zwischen der Lichtbündelungseinrichtung und der Lichtdivergenzeinrichtung kann größer gleich etwa 10 mm, vorzugsweise größer gleich etwa 20 mm und höchstvorzugsweise größer gleich etwa 30 mm sein. Der Querschnitt des Lichtstrahls mit dem zweiten, kleineren und vorzugsweise parallelen Winkelspektrum beträgt etwa 3 bis etwa 20 mm, vorzugsweise etwa 5 bis etwa 15 mm, höchstvorzugsweise etwa 8 bis etwa 12 mm. Das Winkelspektrum des aus der Lichtabgabeeinrichtung austretenden divergenten Lichtstrahls beträgt etwa 25° bis etwa 35°, vorzugsweise etwa 40° bis etwa 50°, vorzugsweise etwa 50° bis etwa 70°, vorzugsweise etwa 80° bis etwa 100°, höchstvorzugsweise etwa 110° bis etwa 130°.The light bundling device is a converging lens, in particular a Fresnel lens. The light divergence device can be a scattering lens or a diffuser. The distance between the light bundling device and the light divergence device may be greater than or equal to approximately 10 mm, preferably greater than or equal to approximately 20 mm, and most preferably greater than or equal to approximately 30 mm. The cross section of the light beam having the second, smaller and preferably parallel angular spectrum is about 3 to about 20 mm, preferably about 5 to about 15 mm, most preferably about 8 to about 12 mm. The angular spectrum of the divergent light beam exiting the light emitting device is about 25 ° to about 35 °, preferably about 40 ° to about 50 °, preferably about 50 ° to about 70 °, preferably about 80 ° to about 100 °, most preferably about 110 ° to about 130 °.

Die Lichtbündelungseinrichtung kann gegenüber der Platine räumlich festgelegt sein. Dadurch vermindert sich die eingangs beschriebene Toleranzkette für den Lichtstrahl mit dem zweiten, kleineren und vorzugsweise parallelen Winkelspektrum auf die Positionstoleranz des Chips der Leuchtdiode, der Linse der Leuchtdiode, der Leuchtdiode zur Platine und der Platine zur Lichtbündelungseinrichtung. Die Lichtbündelungseinrichtung kann an der Platine befestigt sein. Die Platine kann Ausnehmungen aufweisen, in die Vorsprünge der Lichtbündelungseinrichtung eingreifen. Die Ausnehmungen können sich am Rand der Platine befinden oder als Öffnungen ausgebildet sein. Die Vorsprünge der Lichtbündelungseinrichtung können Arme sein. An den Armen können Rastmittel ausgebildet sein.The light bundling device can be spatially fixed relative to the board. As a result, the tolerance chain described above for the light beam with the second, smaller and preferably parallel angle spectrum reduces to the Positional tolerance of the chip of the LED, the LED of the light emitting diode, the LED to the board and the board to Lichtbündelungseinrichtung. The light bundling device may be attached to the circuit board. The circuit board can have recesses into which projections of the light bundling device engage. The recesses may be located at the edge of the board or be formed as openings. The projections of the light bundling device may be arms. On the arms locking means may be formed.

Die Lichtbündelungseinrichtung kann gegenüber einem Gehäuse der Leuchtdiode räumlich festgelegt sein, insbesondere indem die Lichtbündelungseinrichtung einen zum Gehäuse der Leuchtdiode komplementären Bereich aufweist, der die Lichtbündelungseinrichtung gegenüber der Leuchtdiode räumlich festlegt. Die Lichtbündelungseinrichtung kann ein Gehäuse aufweisen, das an seinem der Platine zugewandten Bereich eine zum Gehäuse der LED komplementäre Ausnehmung aufweist. Somit kann das Gehäuse der Lichtbündelungseinrichtung über dem Gehäuse der LED positioniert werden, und das Gehäuse der LED legt das Gehäuse der Lichtbündelungseinrichtung räumlich fest. Der komplementäre Bereich kann am gesamten Gehäuse der Leuchtdiode anliegen oder er kann lediglich an vier Punkten oder zwei Ecken am Gehäuse der Leuchtdiode anliegen. Hierdurch können die durch die Platine verursachten Toleranzen eliminiert werden.The light-bundling device can be spatially fixed relative to a housing of the light-emitting diode, in particular in that the light-bundling device has a region which is complementary to the housing of the light-emitting diode and fixes the light-bundling device spatially relative to the light-emitting diode. The light bundling device may have a housing which has a recess complementary to the housing of the LED at its region facing the printed circuit board. Thus, the housing of the light concentrator can be positioned over the housing of the LED, and the housing of the LED spatially fixes the housing of the light concentrator. The complementary region can rest against the entire housing of the light-emitting diode or it can rest only at four points or two corners on the housing of the light-emitting diode. As a result, the tolerances caused by the board can be eliminated.

Die Platine kann am Gehäuse der Haushaltsgerätlichtabgabeeinrichtung so angeordnet sein, dass die Position der Platine in Richtung der optischen Achse der Haushaltsgerätlichtabgabeeinrichtung und/oder senkrecht zur Richtung der optischen Achse der Haushaltsgerätlichtabgabeeinrichtung durch das Gehäuse der Haushaltsgerätlichtabgabeeinrichtung festgelegt wird. Dadurch kann die Position der Platine und damit die Position der Leuchtdiode einschließlich des Chips und der Linse und die Position der Lichtbündelungseinrichtung zum Gehäuse der Haushaltsgerätlichtabgabeeinrichtung relativ genau festgelegt werden. Weil die Lichtdivergenzeinrichtung integral mit dem Gehäuse der Haushaltsgerätlichtabgabeeinrichtung ausgebildet ist, können bei dieser Ausführungsform die Toleranzen der Toleranzkette weiter reduziert werden und es ergibt sich eine Lichtabgabe, die relativ niedrigen Exemplarstreuungen unterliegt.The board may be arranged on the housing of the household appliance light emitting device so that the position of the board in the optical axis direction of the household appliance light emitting device and / or perpendicular to the optical axis direction of the household appliance light emitting device is determined by the housing of the household appliance light emitting device. Thereby, the position of the board and thus the position of the light emitting diode including the chip and the lens and the position of the light bundling device to the housing of the household appliance light emitting device can be relatively accurately determined. Because the light divergence device is integrally formed with the housing of the household appliance light emitting device, in this embodiment, the tolerances of the tolerance chain can be further reduced, resulting in a light output subject to relatively low copy scatters.

Das Gehäuse der Haushaltsgerätlichtabgabeeinrichtung kann einen ersten Bereich mit einem ersten Querschnitt aufweisen und einen zweiten Bereich mit einem zweiten Querschnitt aufweisen, wobei der erste Bereich einen kleineren Querschnitt als der zweite Bereich aufweist, ein stufenförmiger Übergang zwischen dem ersten und zweiten Bereich vorhanden ist, die Platine vom zweiten Bereich senkrecht zur optischen Achse der Haushaltsgerätlichtabgabeeinrichtung festgelegt wird und der stufenförmige Übergang die Platine in Richtung der optischen Achse festlegt. Gemäß der Erfindung ist die Lichtdivergenzeinrichtung integral mit dem Gehäuse der Haushaltsgerätlichtabgabeeinrichtung ausgebildet. Diese Ausführungsform eignet sich besonders für ein Gussverfahren.The housing of the household appliance light emitting device may have a first region with a first cross section and a second region with a second cross section, wherein the first region has a smaller cross section than the second region, a stepped transition between the first and second area is present, the board is set from the second area perpendicular to the optical axis of the household appliance light emitting device and the stepped transition determines the board in the optical axis direction. According to the invention, the light divergence device is formed integrally with the housing of the household appliance light emitting device. This embodiment is particularly suitable for a casting process.

Bei einer alternativen Ausführungsform kann die Platine am Deckel angeordnet sein. Der Deckel kann, beispielsweise mittels einer Einschnapptechnik, am Gehäuse befestigt sein. Die Linse kann, wie zuvor beschrieben, an der Platine angeordnet sein. Bei dieser Ausführungsform können Größenabweichungen der Platine, die beispielsweise ±0,15 mm betragen können, kompensiert werden, da die Platine nicht am Gehäuse anliegt. Die Größentoleranz der Platine kann somit nicht zu einem Klemmen der Platine im Gehäuse, nicht zu einer Verformung des Gehäuses und nicht zu einem Spiel der Platine im Gehäuse führen.In an alternative embodiment, the board may be arranged on the lid. The lid may be fastened to the housing, for example by means of a snap-in technique. The lens may be disposed on the board as previously described. In this embodiment, size deviations of the board, which may be, for example ± 0.15 mm, can be compensated because the board is not applied to the housing. The size tolerance of the board can thus not lead to a jamming of the board in the housing, not to a deformation of the housing and not to a game of the board in the housing.

Die Erfindung wird nun unter Bezugnahme auf die beigefügten Figuren detaillierter beschrieben, wobei:

Figur 1
eine schematischer Schnitt durch eine erfindungsgemäße Haushaltsgerätlichtabgabeeinrichtung ist,
Figur 2
eine schematische Draufsicht auf eine Platine der Haushaltsgerätlichtabgabeeinrichtung ist und
Figur 3
ein weggebrochener Schnitt durch das Gehäuse und die Platine der Haushaltsgerätlichtabgabeeinrichtung ist.
The invention will now be described in more detail with reference to the attached figures, wherein:
FIG. 1
a schematic section through a household appliance light emitting device according to the invention,
FIG. 2
a schematic plan view of a board of the household appliance light emitting device is and
FIG. 3
a broken away section through the housing and the board of the household appliance light emitting device is.

Die nachstehend beschriebene Lichtabgabeeinrichtung für ein Haushaltsgerät kann verwendet werden, um einem Nutzer einen Betriebszustand des Haushaltsgeräts, beispielsweise einer Waschmaschine, eines Geschirrspülers, eines Herds, eines Kühlschranks und dergleichen anzuzeigen. Ferner kann die Lichtabgabeeinrichtung dazu verwendet werden, um das Innere und/oder die Umgebung des Haushaltsgeräts zu beleuchten.The light emitting device for a household appliance described below may be used to indicate to a user an operating state of the household appliance such as a washing machine, a dishwasher, a cooker, a refrigerator, and the like. Furthermore, the light emitting device can be used to illuminate the interior and / or the environment of the household appliance.

Es wird auf Figur 1 Bezug genommen. Die Lichtabgabeeinrichtung weist ein Gehäuse 2 auf, in dem eine Platine 12 mit einer Leuchtdiode 10 angeordnet ist. Die Haushaltsgerätlichtabgabeeinrichtung wird mit einem Deckel 30 geschlossen. Die Haushaltsgerätlichtabgabeeinrichtung kann mittels des Gehäuses 2 oder des Deckels 30 an einem Haushaltsgerät befestigt, das heißt räumlich festgelegt, sein. Ein Chip (nicht gezeigt) der Leuchtdiode 10 emittiert Licht, das durch eine Linse 16 der Leuchtdiode 10 in ein vorbestimmtes Winkelspektrum, beispielsweise etwa 120°, gebracht wird. Das Winkelspektrum der Leuchtdiode kann so definiert sein, dass die Intensität am Rand des Winkelspektrums 50% der Maximalintensität beträgt. Die aus der Linse 16 der Leuchtdiode 10 austretenden Lichtstrahlen 18 mit dem relativ großen Winkelspektrum treffen auf eine Sammellinse 6 auf. Die Sammellinse 6 arbeitet als Lichtbündelungseinrichtung bzw. Lichtparallelisierungseinrichtung. Die Sammellinse 6 erzeugt einen im Wesentlichen parallelen Lichtstrahl 8. Das Intensitätsspektrum des im Wesentlichen parallelen Lichtstrahls kann so definiert sein, dass die Intensität am Rand des Winkelspektrums 50% der Maximalintensität beträgt. Dieser im Wesentlichen parallele Lichtstrahl 8 verläuft durch das hohle Gehäuse 2. Der im Wesentlichen parallele Lichtstrahl 8 trifft auf eine Lichtdivergenzeinrichtung 4 auf. Der im Wesentlichen parallele Lichtstrahl 8 verläuft dabei über eine Strecke S, die etwa so lang wie der Durchmesser des Strahls in diesem Bereich oder länger. Die Lichtdivergenzeinrichtung kann beispielsweise eine Streulinse oder ein Diffusor sein. Der Ausdruck "im Wesentlichen paralleler Lichtstrahl" 8 kann einen Lichtstrahl umfassen, der beispielsweise aufgrund von Herstell- und/oder Montagetoleranzen auch etwas konvergiert oder divergiert. Der im Wesentlichen parallele Lichtstrahl kann um etwa ±10° konvergieren oder divergieren. Der Öffnungswinkel des aus der Lichtdivergenzeinrichtung austretenden Lichtstrahls 22 kann beispielsweise etwa 45° betragen. Die Toleranzen sind bei einem derartigen kostengünstigen Massenartikel relativ hoch.It will open FIG. 1 Referenced. The light emitting device has a housing 2, in which a circuit board 12 is arranged with a light emitting diode 10. The household appliance light emitting device is closed with a lid 30. The household appliance light emitting device can by means of the housing 2 or the lid 30 attached to a household appliance, that is spatially determined to be. A chip (not shown) of the light emitting diode 10 emits light which is brought by a lens 16 of the light emitting diode 10 in a predetermined angular spectrum, for example about 120 °. The angle spectrum of the light-emitting diode can be defined such that the intensity at the edge of the angle spectrum is 50% of the maximum intensity. The emerging from the lens 16 of the LED 10 light rays 18 with the relatively large angle spectrum incident on a converging lens 6. The condenser lens 6 operates as a light bundling device or light parallelizing device. The converging lens 6 produces a substantially parallel light beam 8. The intensity spectrum of the substantially parallel light beam may be defined such that the intensity at the edge of the angular spectrum is 50% of the maximum intensity. This substantially parallel light beam 8 passes through the hollow housing 2. The substantially parallel light beam 8 impinges on a light divergence device 4. The substantially parallel light beam 8 extends over a distance S, which is about as long as the diameter of the beam in this area or longer. The light divergence device can be for example a scattering lens or a diffuser. The term "substantially parallel light beam" 8 may include a light beam which also converges or diverges somewhat due to, for example, manufacturing and / or assembly tolerances. The substantially parallel light beam may converge or diverge by about ± 10 °. The opening angle of the light beam 22 emerging from the light divergence device can be for example about 45 °. The tolerances are relatively high in such a low-cost mass-produced article.

Der Öffnungswinkel des aus der Lichtdivergenzeinrichtung austretenden Lichtstrahls kann zwischen 25° und 180° betragen. Derartige Öffnungswinkel lassen sich beispielsweise durch einen konvexen Diffusor oder durch eine konvexe Streulinse erreichen.The opening angle of the light beam emerging from the light divergence device can be between 25 ° and 180 °. Such opening angles can be achieved, for example, by a convex diffuser or by a convex diffusing lens.

Die Sammellinse 6 ist mittels Armen 24 mit Rastnasen 28 an der Platine 12 befestigt. Die Platine 12 kann Öffnungen 34 (siehe Figur 2) aufweisen, durch die sich die Arme 24 erstrecken.The converging lens 6 is fixed by means of arms 24 with locking lugs 28 on the circuit board 12. The board 12 may have openings 34 (see FIG. 2 ), through which the arms 24 extend.

Am Gehäuse 2 sind Vorsprünge 32 vorgesehen, die die Platine in ihrer Position in Richtung der optischen Achse der Lichtabgabeeinrichtung festlegen. Die Platine 12 hat einen Außendurchmesser, der dem Innendurchmesser des Gehäuses 2 der Lichtabgabeeinrichtung entspricht, so dass das Gehäuse 2 die Platine 12 auch in ihrer Position senkrecht zur optischen Achse der Lichtabgabeeinrichtung festlegt.On the housing 2 projections 32 are provided which define the board in its position in the direction of the optical axis of the light emitting device. The circuit board 12 has an outer diameter corresponding to the inner diameter of the housing 2 of the light emitting device, so that the housing 2, the board 12 also defines in its position perpendicular to the optical axis of the light emitting device.

Es wird auf Figur 2 Bezug genommen. Figur 2 zeigt eine Draufsicht auf die Platine 12. Auf der Platine 12 ist die Leuchtdiode 10 angeordnet. Ferner weist die Platine 12 Öffnungen 34 auf, durch die je ein Arm 24 verlaufen kann.It will open FIG. 2 Referenced. FIG. 2 shows a plan view of the board 12. On the board 12, the light-emitting diode 10 is arranged. Further, the board 12 has openings 34 through which an arm 24 can pass.

Die Sammellinse 6 ist somit relativ genau mit der Platine 12 ausgerichtet. Durch Verwendung geeigneter Löttechniken wird die Leuchtdiode 10, falls eine SMD-Leuchtdiode verwendet wird, auf den dafür vorgesehenen Lötflächen (Pad) zentriert. Dadurch ergibt sich auf kostengünstige Weise eine vergleichsweise genaue Ausrichtung der optischen Achse der Leuchtdiode mit der optischen Achse der Sammellinse 6. Dies erhöht die Qualität der Lichtabgabe der Haushalsgerätlichtabgabeeinrichtung.The converging lens 6 is thus aligned relatively accurately with the board 12. By using suitable soldering techniques, the light-emitting diode 10, if an SMD LED is used, centered on the designated pads (pad). This results in a cost-effective manner a comparatively accurate alignment of the optical axis of the light emitting diode with the optical axis of the converging lens 6. This increases the quality of the light output of Haushalsgerätlichtabgabeeinrichtung.

Es wird auf Figur 3 Bezug genommen, die einen weggebrochenen Schnitt in Richtung der optischen Achse der Lichtabgabeeinrichtung durch einen Teil des Gehäuses 2 und der Platine 12 der Lichtabgabeeinrichtung zeigt. Das Gehäuse der Lichtabgabeeinrichtung weist einen ersten Bereich 2a und eine zweiten Bereich 2b auf. Der erste Bereich 2a hat einen kleineren Querschnitt als der zweite Bereich 2b. Der Querschnitt (senkrecht zur optischen Achse der Lichtabgabeeinrichtung) des Gehäuses hat eine kreisrunde, elliptische, rechteckige, polygonale Form.It will open FIG. 3 Reference is made, which shows a broken section in the direction of the optical axis of the light emitting device through a part of the housing 2 and the circuit board 12 of the light emitting device. The housing of the light emitting device has a first region 2a and a second region 2b. The first region 2a has a smaller cross section than the second region 2b. The cross section (perpendicular to the optical axis of the light emitting device) of the housing has a circular, elliptical, rectangular, polygonal shape.

Der Übergang zwischen dem ersten Bereich 2a und dem zweiten Bereich 2b des Gehäuses 2 ist stufenförmig. Der stufenförmige Übergang legt die Position der Platine 12 in Richtung der optischen Achse der Lichtabgabeeinrichtung fest. Der Innendurchmesser des zweiten Bereichs 2b legt die Position der Platine 12 senkrecht zur optischen Achse der Lichtabgabeeinrichtung fest. Die Lichtdivergenzeinrichtung 4 ist integral mit dem ersten Bereich 2a ausgebildet oder an diesem angeordnet. Folglich weist das Gehäuse 2 mit den beiden Bereichen 2a und 2b keine Hinterschneidungen auf, so dass es durch eine Gusstechnik, beispielsweise Spritzguss, hergestellt werden kann. Der Innendurchmesser des zweiten Bereichs 2b ermöglicht eine relativ genaue Ausrichtung der Platine 12 und somit der optischen Achse der Leuchtdiode 10 und der Sammellinse 6, wie zuvor unter Bezugnahme auf Figuren 1 und 2 beschrieben wurde. Dadurch kann die Toleranzkette, die durch die Addition der Herstell- und/oder Positionstoleranzen der Lichtdivergenzeinrichtung 4, des Gehäuses 2, der Platine 12, der LED 10 inklusive Chip und Linse 16 zur Platine sowie der Sammellinse 6 zur Platine entsteht, reduziert werden.The transition between the first region 2 a and the second region 2 b of the housing 2 is step-shaped. The stepped transition determines the position of the board 12 in the direction of the optical axis of the light emitting device. The inner diameter of the second region 2b defines the position of the circuit board 12 perpendicular to the optical axis of the light emitting device. The light divergence device 4 is formed integrally with or disposed on the first region 2a. Consequently, the housing 2 with the two areas 2a and 2b has no undercuts, so that it can be produced by a casting technique, for example by injection molding. The inner diameter of the second region 2b allows a relatively accurate alignment of the circuit board 12 and thus the optical axis of the light-emitting diode 10 and the condenser lens 6, as previously with reference to FIG FIGS. 1 and 2 has been described. As a result, the tolerance chain, which results from the addition of the production and / or position tolerances of the light divergence device 4, the housing 2, the circuit board 12, the LED 10 including chip and lens 16 to the circuit board and the converging lens 6 to the circuit board, can be reduced.

Die Platine 12 wird mittels eines Andrückelements 36 gegen den stufenförmigen Bereich des Gehäuses 2 der Lichtabgabeeinrichtung gedrückt. Vorzugsweise ist das Andrückelement 36 integral mit dem Deckel 30 ausgebildet. Der Deckel 30 kann mittels einer Rastnase am Gehäuse 2 einrasten.The circuit board 12 is pressed by means of a pressing element 36 against the stepped portion of the housing 2 of the light emitting device. Preferably that is Pressing element 36 formed integrally with the lid 30. The cover 30 can engage on the housing 2 by means of a latching lug.

Bei einer anderen Ausführungsform (nicht gezeigt) kann die Platine am Deckel angeordnet sein. Der Deckel kann, beispielsweise mittels einer Einschnapptechnik, am Gehäuse befestigt sein. Die Linse kann, wie zuvor beschrieben, an der Platine angeordnet sein. Bei dieser Ausführungsform können Größenabweichungen der Platine, die beispielsweise ±0,15 mm betragen können, kompensiert werden, da die Platine nicht am Gehäuse anliegt. Die Größentoleranz der Platine kann somit nicht zu einem Klemmen der Platine im Gehäuse, nicht zu einer Verformung des Gehäuses und nicht zu einem Spiel der Platine im Gehäuse führen. Diese Ausführungsform hat einen einfacheren Aufbau und kann einfacher montiert werden. Bei dieser Ausführungsform ist auch die Verkabelung einfacher zu realisieren.In another embodiment (not shown), the board may be located on the lid. The lid may be fastened to the housing, for example by means of a snap-in technique. The lens may be disposed on the board as previously described. In this embodiment, size deviations of the board, which may be, for example ± 0.15 mm, can be compensated because the board is not applied to the housing. The size tolerance of the board can thus not lead to a jamming of the board in the housing, not to a deformation of the housing and not to a game of the board in the housing. This embodiment has a simpler structure and can be mounted more easily. In this embodiment, the wiring is easier to implement.

Es wird nochmals auf Figur 1 Bezug genommen. Die erfindungsgemäße Lichtabgabeeinrichtung hat den Vorteil, dass sie aus wenigen Teilen hergestellt werden kann, die kostengünstig in einem Gussverfahren hergestellt werden können. Ferner ist die erfindungsgemäße Lichtabgabeeinrichtung so aufgebaut, dass die Auswirkungen von Herstelltoleranzen möglichst gering sind. Da die Leuchtdiode 10 aus der Linse 16 ein Lichtbündel 18 mit einem relativ großen Öffnungswinkel emittiert, hat die Positionstoleranz der Leuchtdiode auf der Platine 12 und die Positionstoleranz der Platine 12 gegenüber dem Gehäuse 2 nur einen relativ geringen Einfluss auf die Qualität des von der Lichtabgabeeinrichtung abgegebenen Lichtstrahls. Der Ausdruck Positionstoleranz betrifft hier auch ein Verkippen der Leuchtdiode 10, der Platine, des Chips der Leuchtdiode und/oder der Linse 16 der Leuchtdiode. Aufgrund des großen Öffnungswinkels des aus der Leuchtdiode 10 austretenden Lichtbündels 18 ist die Lichtabgabeeinrichtung auch gegenüber Kipptoleranzen tolerant. Selbst bei einer Verkippung und/oder Verschiebung der Leuchtdiode 10, der Platine 12 des Chips und/oder der Linse 16 der Leuchtdiode entsteht ein hinreichend breiter im Wesentlichen paralleler Lichtstrahl, der auf die Lichtdivergenzeinrichtung 4 auftrifft. Die Sammellinse 6 muss nicht notwendigerweise einen im Wesentlichen parallelen Lichtstrahl erzeugen. Der von der Sammellinse 6 erzeugte Lichtstrahl kann konvergieren oder divergieren. Der von der Divergenzeinrichtung 4 erzeugte Lichtstrahl 22 hat eine wesentlich größere Divergenz als der in die Divergenzeinrichtung 4 eintretende Lichtstrahl 8.It will open again FIG. 1 Referenced. The light-emitting device according to the invention has the advantage that it can be produced from a few parts, which can be produced inexpensively in a casting process. Furthermore, the light emitting device according to the invention is constructed so that the effects of manufacturing tolerances are minimized. Since the light-emitting diode 10 emits a light beam 18 with a relatively large aperture angle from the lens 16, the positional tolerance of the light emitting diode on the circuit board 12 and the positional tolerance of the circuit board 12 with respect to the housing 2 have only a relatively small effect on the quality of the light emitted by the light emitting device light beam. The term position tolerance here also applies to a tilting of the light emitting diode 10, the board, the chip of the light emitting diode and / or the lens 16 of the light emitting diode. Due to the large opening angle of the emerging from the light emitting diode 10 light beam 18, the light emitting device is tolerant to tilting tolerances. Even with a tilting and / or displacement of the light-emitting diode 10, the circuit board 12 of the chip and / or the lens 16 of the light emitting diode, a sufficiently broad substantially parallel light beam is produced, which impinges on the light divider 4. The condenser lens 6 does not necessarily have to generate a substantially parallel light beam. The light beam generated by the condenser lens 6 may converge or diverge. The light beam 22 generated by the divergence device 4 has a significantly greater divergence than the light beam 8 entering the divergence device 4.

Claims (14)

  1. A household appliance light emitting device, comprising:
    - a light emitting diode (10) emitting a light beam having a first angular spectrum;
    - a converging lens (6) converting the light beam from the light emitting diode (10) into a light beam (8) having a second angular spectrum, wherein the second angular spectrum is smaller than the first angular spectrum;
    - a path (S) travelled by the light beam (8) having the second angular spectrum;
    - a light diverging device (4) converting the light (8) having the second angular spectrum into a divergent light beam (22); and comprising
    - a housing (2), within which the path (S) extends, wherein
    - the light diverging device (4) is integrally formed with the housing (2).
  2. The household appliance light emitting device according to claim 1, characterized in that the light beam (8) having the second angular spectrum substantially is a parallel light beam.
  3. The household appliance light emitting device according to claims 1 or 2, characterized in that the cross-sectional area of the light beam (8) having the second angular spectrum is greater than the luminous surface of the chip of the light emitting diode (10).
  4. The household appliance light emitting device according to any one of claims 1 to 3, characterized in that the light emitting diode (10) is a SMD light emitting diode attached to a circuit board (12) by means of soldering.
  5. The household appliance light emitting device according to any one of claims 1 to 4, characterized by a plurality of light emitting diodes (10), wherein the light converging device (6) converts the light of the plurality of light emitting diodes into a light beam (8) having the second angular spectrum.
  6. The household appliance light emitting device according to any one of claims 1 to 5, characterized in that the converging lens (6) is a Fresnel lens.
  7. The household appliance light emitting device according to any one of claims 1 to 6, characterized in that light diverging device (4) is a diffuser lens or diffuser.
  8. The household appliance light emitting device according to any one of claims 1 to 7, characterized in that the distance (S) between the light converging device (6) and the light diverging device (4) is greater than or equal to approx. 10 mm, preferably greater than or equal to approx. 20 mm, particularly preferably greater than or equal to approx. 30 mm, and/or the cross-section of the light beam (8) having the second angular spectrum is approx. 3 to approx. 20 mm, preferably 5 to approx. 15 mm, particularly preferably 8 to approx. 12 mm.
  9. The household appliance light emitting device according to any one of claims 1 to 8, characterized in that the angular spectrum of the divergent light beam (22) is approx. 25° to approx. 35°, preferably approx. 40° to approx. 50°, preferably approx. 50° to approx. 70°, preferably approx. 80° to approx. 100°, particularly preferably approx. 110° to approx. 130°.
  10. The household appliance light emitting device according to any one of claims 1 to 9, characterized in that the light converging device (6) is spatially fixed with respect to the circuit board (12), in particular, by attaching the light converging device to the circuit board.
  11. The household appliance light emitting device according to claim 10, characterized in that the circuit board comprises recesses (34), into which projections (24) of the light converging device (6) engage.
  12. The household appliance light emitting device according to any one of claims 1 to 11, characterized in that the light converging device (6) is spatially fixed with respect to a housing (2) of the light emitting diode (10), in particular, as the light converging device comprises a region complementary to the housing of the light emitting diode, which region spatially fixes the light converging device with respect to the light emitting diode.
  13. The household appliance light emitting device according to any one of claims 1 to 12, characterized in that the circuit board (12) is arranged at the housing (2) of the household appliance light emitting device so that the position of the circuit board (12) is fixed in the direction of the optical axis of the household appliance light emitting device and/or perpendicularly to the direction of the optical axis of the household appliance light emitting device by the housing (2, 2a, 2b) of the household appliance light emitting device.
  14. The household appliance light emitting device according to claim 12, characterized in that the housing (2) of the household appliance light emitting device comprises a first region (2a) having a first cross-section and a second region (2b) having a second cross-section, wherein the first region (2a) has a smaller cross-section than the second region (2b), a stepped transition between the first and second regions (2a, 2b) is provided, the circuit board (12) is fixed perpendicularly to the optical axis of the household appliance light emitting device by the second region (2b), and the stepped transition (2a, 2b) fixes the circuit board (12) in the direction of the optical axis of the household appliance light emitting device.
EP08008046.8A 2008-04-25 2008-04-25 Light emitting device for a domestic appliance Active EP2112424B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP08008046.8A EP2112424B1 (en) 2008-04-25 2008-04-25 Light emitting device for a domestic appliance
PCT/EP2009/003050 WO2009130055A1 (en) 2008-04-25 2009-04-27 Light-emitting unit for a domestic appliance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08008046.8A EP2112424B1 (en) 2008-04-25 2008-04-25 Light emitting device for a domestic appliance

Publications (2)

Publication Number Publication Date
EP2112424A1 EP2112424A1 (en) 2009-10-28
EP2112424B1 true EP2112424B1 (en) 2014-06-25

Family

ID=39650974

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08008046.8A Active EP2112424B1 (en) 2008-04-25 2008-04-25 Light emitting device for a domestic appliance

Country Status (2)

Country Link
EP (1) EP2112424B1 (en)
WO (1) WO2009130055A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5668251B2 (en) 2010-08-31 2015-02-12 東芝ライテック株式会社 Light bulb shaped lamp and lighting equipment
EP2850362B1 (en) * 2012-11-20 2018-03-21 Siemens Aktiengesellschaft Indicator lamp
DE202013101814U1 (en) * 2013-04-26 2014-07-29 Zumtobel Lighting Gmbh LED module with contact protection element
DE102015002653B4 (en) * 2015-03-03 2017-11-16 Emz-Hanauer Gmbh & Co. Kgaa Luminaire for installation in a household electrical appliance
DK3339722T5 (en) 2016-12-20 2019-10-28 Obelux Oy OBSTRUCTION ILLUMINATOR, OBSTRUCTION ILLUMINATOR DEVICE AND INSTALLATION PROCEDURE
US11396994B1 (en) * 2021-02-16 2022-07-26 Ii-Vi Delaware, Inc. Laser light source having diffuser element and light diverging optic

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2826680A (en) * 1956-03-29 1958-03-11 Sears Roebuck & Co Pilot light assembly
US3228288A (en) * 1961-10-20 1966-01-11 Square D Co Interlocking cap and lens for indicator lights
US4811179A (en) * 1986-04-28 1989-03-07 Koito Manufacturing Co., Ltd. Display device

Also Published As

Publication number Publication date
WO2009130055A1 (en) 2009-10-29
EP2112424A1 (en) 2009-10-28

Similar Documents

Publication Publication Date Title
EP2459795B1 (en) Light emitting device for a drum of a household appliance
EP2112424B1 (en) Light emitting device for a domestic appliance
EP1327167B1 (en) Optical collimation device
DE102010018119B4 (en) Optical element for a lighting device of a vehicle
EP1787155A1 (en) Laterally-emitting, radiation-generating component, and lens for one such component
DE10124370A1 (en) Optical element, comprising a transparent base member with reflecting surfaces which are structured and formed to reflect some of the light leaving
WO2016096600A1 (en) Lighting device
DE102005019832A1 (en) Illumination device for LCD-display device, has auxiliary component designed as optical component and inserted into recess in optical unit, where component is connected with optical unit in connection region in mechanically stable manner
WO2018138114A1 (en) Optoelectronic component and method for producing an optoelectronic component
DE102010005806A1 (en) Illumination device for use in vehicles and for illuminating cooking chamber of steamer, has illuminant, which is arranged on printed circuit board and flat light conductor, which has light input surface and light emitting surface
EP2871411B1 (en) Optical element for a lamp, and lamp
DE19930584C1 (en) Optical signalling device for traffic control signal uses light source elements positioned on base plate with their positioning determining beam characteristic or light intensity distribution
DE202015101870U1 (en) Optical system and arrangement for emitting light
EP2253880B1 (en) Light for vehicles
EP3461687A1 (en) Light guide arrangement for a motor vehicle light and motor vehicle light provided with such a light guide arrangement
DE102011004683A1 (en) Light assembly for lamp used for interior lighting in e.g. building, has LEDs enclosed in LED board such that lower end of spacer rests on LED board and the upper end protrudes into light inlet opening of reflector to form luminous flux
WO2016075256A1 (en) Optoelectronic component and illumination device
DE102020118661A1 (en) SIGNAL LAMP WITH 3D LIGHT EFFECT
DE29623763U1 (en) Electrical household appliance with operating display
DE19938734A1 (en) Light, especially for vehicle, has light source arranged so that central light source axis is not parallel to main beam direction in which reflector deflects light from source
EP4160084A1 (en) Interior light and lens with pinhole aperture
WO2010136248A1 (en) Electric lamp
EP3358250B1 (en) Lighting apparatus with a light guide plate having deflection structures
DE102010039530A1 (en) Panel of a control unit for a household appliance, control unit for a household appliance and household appliance
DE202016100565U1 (en) Light guide element and light with a light guide element

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA MK RS

17P Request for examination filed

Effective date: 20100127

17Q First examination report despatched

Effective date: 20100308

AKX Designation fees paid

Designated state(s): DE IT

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

INTG Intention to grant announced

Effective date: 20140120

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE IT

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 502008011921

Country of ref document: DE

Effective date: 20140731

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 502008011921

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140625

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20150326

REG Reference to a national code

Ref country code: DE

Ref legal event code: R082

Ref document number: 502008011921

Country of ref document: DE

Representative=s name: HANNKE BITTNER & PARTNER, PATENT- UND RECHTSAN, DE

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20230427

Year of fee payment: 16