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EP3290810B1 - Household devices luminaire - Google Patents

Household devices luminaire Download PDF

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Publication number
EP3290810B1
EP3290810B1 EP17187080.1A EP17187080A EP3290810B1 EP 3290810 B1 EP3290810 B1 EP 3290810B1 EP 17187080 A EP17187080 A EP 17187080A EP 3290810 B1 EP3290810 B1 EP 3290810B1
Authority
EP
European Patent Office
Prior art keywords
light
reflector
lamp
domestic appliance
axis
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
EP17187080.1A
Other languages
German (de)
French (fr)
Other versions
EP3290810A1 (en
Inventor
Olaf Baumeister
Thomas Herbst
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.)
BJB GmbH and Co KG
Original Assignee
BJB GmbH and Co KG
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
Priority claimed from DE202016104855.9U external-priority patent/DE202016104855U1/en
Application filed by BJB GmbH and Co KG filed Critical BJB GmbH and Co KG
Publication of EP3290810A1 publication Critical patent/EP3290810A1/en
Application granted granted Critical
Publication of EP3290810B1 publication Critical patent/EP3290810B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGESĀ ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/008—Illumination for oven cavities
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/20—Light sources comprising attachment means
    • F21K9/23—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
    • F21K9/233—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings specially adapted for generating a spot light distribution, e.g. for substitution of reflector lamps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/61—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using light guides
    • 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
    • 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
    • F21V33/00—Structural combinations of lighting devices with other articles, not otherwise provided for
    • F21V33/0004—Personal or domestic articles
    • F21V33/0044—Household appliances, e.g. washing machines or vacuum cleaners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGESĀ ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/08—Arrangement or mounting of control or safety devices
    • F24C7/082—Arrangement or mounting of control or safety devices on ranges, e.g. control panels, illumination
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/6444—Aspects relating to lighting devices in the microwave cavity
    • 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
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/30—Lighting for domestic or personal use
    • F21W2131/307—Lighting for domestic or personal use for ovens

Definitions

  • the invention relates to a household appliance light for cooking appliances, such as ovens, microwave ovens or steamer, with an LED as a light source, with a provided for installation on a device wall luminaire housing, with a light exit opening in the luminaire housing, which is closed by a translucent cover, with a spacer, which is disposed between the LED and the light exit opening and is located in front of the light exit plane of the LED, with a reflection means, which forward the light emitted by the LED light of the cover.
  • Domestic appliance lights are known from the prior art in many forms. They are usually used to illuminate the interior of a household appliance during its operation or the insight of a user in such a recording room.
  • the illumination of the household appliance interior should allow a sufficient visual perception of the food by the user, which often causes problems due to shadowing, for example by shelves in refrigerators or trays in ovens due to shading.
  • the lighting should basically not dazzle the user as possible, with the technical components used for this purpose bring light losses, which are disadvantageous.
  • the DE 10 2009 002 775 A1 should serve as an example of a cooking appliance lamp from the prior art.
  • this lamp is held in a housing cutout on a light housing.
  • the light exit opening of the lamp housing is provided with a translucent cover, which protects the lamp interior primarily from contamination, but also already represents a first thermal barrier.
  • the luminaire housing carries at its end facing away from the Garellaraum a cylindrical spacer element, wherein the cylinder jacket surface is surrounded by a reflection material.
  • the cylinder cover surfaces are provided with translucent cover elements.
  • this cylinder designed in this way serves to space the LED arranged at its end remote from the cooking chamber as far as possible from the cooking chamber and to minimize the heat load by means of this first measure.
  • cover elements form further temperature barriers.
  • the cylinder itself also serves as a light well to guide the light emitted by the LED towards the cooking chamber.
  • the LED is mounted on a heat sink, so that the heat of operation can also be dissipated via the heat barriers to LED residual heat.
  • the measures described here for spacing the LED from the cooking chamber and for heat shielding reduce the luminous efficiency and the illumination quality of the domestic appliance interior.
  • more powerful LEDs can be used, whereby their higher operating temperature is problematic.
  • WO2009 / 141068 A1 or EP 1598682 A2 use light guides to direct the light away from a cooking area in the oven into it.
  • the highly directed radiation caused by this requires a large number of light exit openings and - depending on the technical implementation - a variety of light sources and light guides.
  • the large number of point sources of light in the inner wall of the housing with its very high brightness is perceived as unpleasant, so that such solutions are reluctantly implemented for cost and comfort reasons.
  • each support element level in ovens for example, each associated with a baking tray level associated with lighting, so that Shading by other support elements do not affect the illumination quality of each level.
  • the US 2015/0009705 A1 shows a so-called retrofit lamp, which is used to replace conventional discharge or incandescent lamps by LED lamps.
  • the focus of the disclosure deals with various light-guiding elements, which receive the light emitted by an LED light, change the wavelength of the light and give it targeted again.
  • US 2016/0047966 A1 shows a household appliance lamp, in which the light emitted by an LED light is focused by a reflector and is then fed via a lens to a light guide.
  • the light guide is embedded in a device wall and provided with structures for refraction. Through these structures, the light is deflected out of the light guide to illuminate a device interior.
  • US 2016/0131818 A1 discloses a lighting device for the floor nozzle of a vacuum cleaner.
  • a guided parallel to the opening plane of the light exit openings optical fiber is provided with refractive structures, which provide for a light exit from the light exit openings.
  • An LED feeds light into the light guide.
  • EP 2 428 737 A1 a luminaire for lighting a hob.
  • a halogen lamp is used, which is arranged inclined in relation to the reflector. The inclination of the lamp results in an asymmetrically opening cone of light.
  • the main advantage of the household appliance according to the invention is the fact that two different light-influencing components are used to maximize the light output.
  • the material-uniform light guide for example one made of plastic or glass existing Lichtleitstabes, ie an existing light source of solid material
  • the light of the LED is recorded, bundled and brought with the lowest possible stray losses close to the light exit opening of the lamp housing, so close to the inner wall of the domestic appliance interior.
  • the optical waveguide is at least partially in the reflector space, so that the scattered radiation emerging from the optical waveguide is received and also directed in the direction of the light exit opening of the luminaire housing, ie in the direction of the domestic appliance interior.
  • the light guide allows the widest possible spacing of the LED from the household appliance interior and serves for heat shielding.
  • the heat shield is the reflector, which reflects not only the scattered light, but also from the device interior entering heat radiation.
  • the light exit surface of the light guide is inclined relative to a central axis of the light guide.
  • the cone axis of the emerging from the light exit surface light cone is also inclined relative to the central axis of the light guide, wherein in the application, the light exit surface facing away from the user, that is inclined in the direction of, for example, the cooking chamber rear wall. Due to the inclined light exit surface of the emerging light cone is pivoted into the device interior, which is expressed by a corresponding inclination of the cone axis - which rises from the cone tip and extends through the center of the cone bottom - expresses.
  • the conical surface of the emerging light cone is determined by the emission angle (equal to the half-value angle) of the light exit surface.
  • the reflector serves to capture stray light which is otherwise applicable as loss radiation and does not arrive in the domestic appliance interior, which inevitably emerges from the lateral surface of the light guide.
  • the reflector deflects the scattered light largely predominantly in the direction of the cone axis of the light cone emerging from the light exit surface of the light guide, so that a dazzling effect of the user caused by the reflected scattered light is largely avoided.
  • the reflector has two web-shaped reflecting surfaces which emerge from a vertex axis, wherein the vertex axis is arranged near a light entry surface of the optical waveguide. This arrangement near the light entry surface of the light guide ensures that the scattered light emerging from the light guide in principle is absorbed by the reflector.
  • the first, sheet-shaped reflection surface is curved about an axis of curvature parallel to the apex axis, wherein it can be provided that the area near the light entrance surface lies below a plane in which the marginal rays of the beam cone defined by the emission angle of the LED on the boundary surfaces of the light guide shell to meet.
  • the light guide is laterally offset to the apex axis of the reflection surfaces, wherein it can additionally be provided that the inclined light exit surface of the light guide in the direction of the lateral offset decreases.
  • the second sheet-shaped reflection surface is non-curved, in particular flat, and guided to the light entry area near the light entry surface and light guide surface, wherein the inclination of the second reflection surface with respect to the cone axis of the emerging from the light exit surface light cone substantially to the inefficiency of the second reflection surface leads.
  • the offset of the light guide to the apex axis, in particular an offset from the first reflection surface away causes a stronger scattered light output by the first reflection surface.
  • corresponding inclination of the light exit surface emerging from the light exit surface direct light as well as the reflected back from the reflector scattered light is guided in approximately the same direction in the home appliance interior.
  • the second sheet-like reflection surface is not curved and is guided to the light entry surface near transition region of the light exit surface and light guide surface, wherein the inclination of the second reflection surface with respect to the cone axis of the light exit surface emerging light cone essentially leads to the inefficiency of the second reflection surface.
  • the reflector and the immersion depth of the light guide are matched to one another in the reflector space in such a way that the reflector merely transmits the scattered radiation emerging from the light guide. but not reflected from the light exit surface emerging direct radiation.
  • a household appliance light also called just light, total provided with the reference numeral 10.
  • the home appliance light includes, as out FIG. 1 it can be seen, first a heat sink 11 on which a board 12 with attached LED 13 (FIG. FIG. 2 ) is placed.
  • a light housing 14 made of an electrically and thermally insulating material, such as plastic or ceramic, is arranged, within which a light guide 15 is held.
  • a light guide 15 is held.
  • it is a rod-shaped optical fiber made of glass. This has an LED near light entrance surface 16 ( FIG. 2 ) and a LED-distant light exit surface 17.
  • the light exit surface 17 is inclined with respect to a central axis of the light guide 15. With respect to the board 12, it has a downward, to the board 12 facing slope. Incidentally, the light exit surface is kept flat.
  • the luminaire housing 14 has latching recesses 18, by means of which a latching spring 19 exhibiting reflector 20 is anchored to the lamp housing 14.
  • the reflector 20 in turn forms an unspecified light exit opening of the lamp 10, which is closed by a translucent cover 21, in the embodiment, a glass pane 22.
  • the reflector 20 has locking elements R, with which it is fixed in a section of a device wall.
  • connection conductor 23 also contacts printed conductors of circuit board 12 with their first ends in a manner not shown, and their ends facing away from circuit board 12 carry a connector 24 for connection to the power supply.
  • FIG. 2 shows the in FIG. 1 illustrated lamp 10 in a sectional view.
  • This sectional view shows that the reflector 20 forms a first reflection surface 25 and a second reflection surface 26.
  • These Reflection surfaces 25/26 are web-shaped, wherein the first reflection surface 25 about a curvature axis (not shown) is curved.
  • the axis of curvature of the first reflection surface 25 lies parallel to the apex axis 28.
  • the second reflection surface 26 forms an inclined surface projecting from the apex axis 28.
  • the apex axis 28 lies on the lamp central axis LM, which extends through the center of the lamp housing base surface and through the center of the cover 21.
  • the light guide 15 extends into the reflector space 29 and is arranged with its longitudinal axis LA laterally offset from the light center axis LM.
  • the light exit surface is inclined in the direction of offset downwards in the direction of board 12 and flat.
  • the reflection surfaces 25 and 26 the light guide 15 is offset away from the first, curved reflection surface 25 in the direction of the second reflection surface 26.
  • the first reflection surface 25 strikes the light guide 15 near the light entrance surface.
  • the second reflection surface 26, strikes the light guide 25.
  • the lowest point is in the direction of board 12 inclined light exit surface in the plane defined by the second reflection surface 26 plane. Due to this special design -the asymmetrically designed reflector 20 with its first, curved reflection surface 25 and its second, designed as an inclined surface reflection surface 26, the lateral offset of the light guide 15 to the lamp center axis LM and the inclined Light exit surface 16 - a special radiation characteristic of the household appliance lamp 10 is effected, which will be explained below.
  • FIG. 3 shows one of the FIG. 2 borrowed representation in which the reflector 20 and cover glass 22 has been omitted for clarity of the facts explained below.
  • dotted lines represent symbolically exemplary light rays emitted by the LED 13.
  • D rays of light denoted by D emerge from the light exit surface 17 and are referred to as so-called direct light.
  • This direct light D leaves the light exit surface 17 in a certain emission angle, which forms the opening angle of the light cone leaving the light exit surface 17.
  • FIG. 3 shows that this scattered light S instead of in the direction of the not shown, the light exit opening of the lamp 10 covering glass pane 22 are thrown back in the direction of the lamp housing 14. They are thus not available for illuminating the domestic appliance interior and can be described as loss radiation.
  • FIG. 3 It can also be seen that the cone axis K shown in dotted lines of the light cone leaving the light guide 15 is tilted in the tilting direction due to the inclination of the light exit surface 17 from the vertical. As a result, the light leaving the light guide 15 is directed substantially away from the light center axis LM or light guide longitudinal axis LA.
  • FIG. 4 essentially corresponds FIG. 2 , where also dashed lines are shown here by way of example, which are for the LED 13 leaving light beams. Based on FIG. 4 can be explained very well the effect of the reflector.
  • the scattered light rays S are taken from the first, curved reflection surface 25 and thrown in the direction of cover 21 and thus in the direction of the light exit opening of the lamp 10.
  • the curvature of the reflection surface is dimensioned so that they throw the scattered light in the direction of offset of the light guide 15, ie substantially in the direction of the cone axis K.
  • the first reflection surface 25 only receives the scattered light S for reflection, the direct light D emerging from the light guide 15 does not strike the first reflection surface 25 due to the arrangement of the light guide 15 within the reflection space 29.
  • the second reflection surface 26 Due to its position and inclination to the light guide 15, the second reflection surface 26 is inoperative and thus does not reflect any light. This is insofar relevant to the overall radiation characteristic of the luminaire 10 as the second reflection surface 26, provided that it would perform a reflective function which reflected light against the cone axis K.
  • the offset of the light guide 15 relative to the light center axis LM causes the direction in the first reflection surface 25 facing lateral surface maximizes and thus the utilization of the scattered light S is optimized taking into account the desired reflection direction to the cone axis K. That the light exit opening of the household appliance lamp 10 or the cover 21 leaving light forms a beam, which is also tilted in total in the offset direction of the light guide 15 and thus has a tendency.
  • the luminaire according to the invention is installed in a domestic appliance, in particular a cooking appliance, that the first reflection surface 25 points away from an interior opening, so this scatters the scattered light rays S in the domestic appliance interior and thus the cone axis K of the light exit surface 17 leaving light cone in the domestic appliance interior is directed, a dazzling effect of a user is effectively avoided.
  • the fastening arms 30, which engage in light guide grooves 31 and hold the light guide 15 in the luminaire housing 14, are arranged in a region of the light guide 15 in which no light rays impinge due to the given LED radiation angle. This ensures that the light guide of the light guide 15 is not adversely affected.
  • FIG. 5 shows a household appliance in the form of a furnace 40.
  • the oven comprises an outer housing wall 41 and an inside cooking chamber wall 42 which defines a cooking chamber 43.
  • the cooking chamber 43 is accessible via an oven door 44, which is formed from an oven door frame 45 and an oven door glass 46, whereby through the furnace door glass 46 insight into the cooking chamber 43 can be taken.
  • the cooking chamber wall 42 is provided with rails 47 which are arranged at different heights and carry food support 48 in the form of, for example, baking trays.
  • domestic appliance lamps 10 according to the invention are mounted, the cooling bodies 11 of which are connected via recesses 50 of the housing wall 41 for heat release with the outside air.
  • This oven is in FIG. 6 shown again in front view of the oven door 44.
  • FIG. 7 the furnace 40 is cut along the section line BB in FIG FIG. 6 shown.
  • the food support 48 which is seated on the rails 47.
  • the Side walls are constructed bivalve and between the cooking chamber wall 42 and the housing wall 41, an insulating material 51 is arranged.
  • the domestic appliance lamp 10 according to the invention is arranged, the heat sink 11 is directed towards the housing wall 41 and the cover 21 in the direction of cooking chamber 43.
  • the cooking chamber rear wall 52 which delimits the cooking chamber towards the rear with respect to the oven door 44, is single-shelled in the present exemplary embodiment, but a two-shell structure is also suitable.
  • FIG. 8 is an enlarged detail according to section circle VII in FIG. 7 .
  • This detail enlargement shows the lamp arranged in cooking chamber wall 42 in detail.
  • the first reflection surface 25 as well as the light exit surface 17 point in the direction of the cooking chamber rear wall 52 and throw the light emitted by the LED 13 into the cooking chamber 43 such that the predominant portion of the emitted radiation is directed away from the oven door 44.
  • the direct light D as well as the scattered light S and directed toward cooking back wall 52
  • Abstrahl characterizing the home appliance lights 10 a dazzling effect of the oven door glass 46 observing the cooking process user with optimal utilization of the emitted light to illuminate the oven 43 avoided.
  • the invention provides a home appliance lamp 10, which by a combination of light guide 15, a provided with asymmetric reflection surfaces 25 and 26 reflector 20 and finally by an offset of the light guide 15 to the lamp center axis LM has a special emission characteristic that allows glare-free illumination of a domestic appliance interior ,
  • the light output is by a desired Abstrahl characterizing supporting use of scattered radiation S of the light guide 15 significantly improved.
  • the light guide 15 allows the spaced arrangement of the LED 13 from the domestic appliance interior, especially when it is a cooking chamber.
  • the reflector 20 not only serves to reflect the scattered light radiation S but also to reflect the heat radiation emerging from a cooking chamber. In this way, the home appliance lamp 10 may be kept compact, so that it is also suitable for installation in home appliance side walls.

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  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
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  • Electromagnetism (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Description

Die Erfindung betrifft eine HaushaltsgerƤteleuchte fĆ¼r GargerƤte, wie Backƶfen, MikrowellengerƤte oder Dampfgarer, mit einer LED als Lichtquelle, mit einem zur Anordnung an einer GerƤtewandung vorgesehenen LeuchtengehƤuse, mit einer Lichtaustrittsƶffnung im LeuchtengehƤuse, welche von einer lichtdurchlƤssigen Abdeckung verschlossen ist, mit einem Abstandselement, welches zwischen der LED und der Lichtaustrittsƶffnung angeordnet ist und vor der Lichtaustrittsebene der LED sitzt, mit einem Reflektionsmittel, welche das von der LED emittierte Licht der Abdeckung zuleiten.The invention relates to a household appliance light for cooking appliances, such as ovens, microwave ovens or steamer, with an LED as a light source, with a provided for installation on a device wall luminaire housing, with a light exit opening in the luminaire housing, which is closed by a translucent cover, with a spacer, which is disposed between the LED and the light exit opening and is located in front of the light exit plane of the LED, with a reflection means, which forward the light emitted by the LED light of the cover.

HaushaltsgerƤteleuchten sind aus dem Stand der Technik in vielfƤltiger Form bekannt. Sie dienen in der Regel zur Beleuchtung des Innenraumes eines HaushaltsgerƤtes bei dessen Betrieb bzw. beim Einblick eines Benutzers in einen solchen Aufnahmeraum.Domestic appliance lights are known from the prior art in many forms. They are usually used to illuminate the interior of a household appliance during its operation or the insight of a user in such a recording room.

Gleich ob es HaushaltsgerƤte zur Nahrungsmittelaufbewahrung (beispielsweise KĆ¼hlgerƤte) oder HaushaltsgerƤte zum Garen von Lebensmitteln (beispielsweise Backƶfen) betrifft, werden bestimmte Anforderungen gestellt, die hƤufig schwer miteinander zu vereinen sind. GrundsƤtzlich soll die Ausleuchtung des HaushaltsgerƤte-Innenraumes eine ausreichende visuelle Wahrnehmung der Nahrungsmittel durch den Benutzer ermƶglichen, was hƤufig durch Abschattungen, beispielsweise durch Einlegebƶden in KĆ¼hlschrƤnken oder Bleche in Backƶfen Probleme aufgrund von Verschattungen bereitet. Zudem soll die Beleuchtung den Benutzer grundsƤtzlich mƶglichst nicht blenden, wobei die hierfĆ¼r einzusetzenden technischen Bauteile Lichtverluste mit sich bringen, die nachteilig sind.Whether it concerns home appliances for food storage (eg refrigerators) or home appliances for cooking food (eg ovens), certain requirements are made that are often difficult to reconcile. In principle, the illumination of the household appliance interior should allow a sufficient visual perception of the food by the user, which often causes problems due to shadowing, for example by shelves in refrigerators or trays in ovens due to shading. In addition, the lighting should basically not dazzle the user as possible, with the technical components used for this purpose bring light losses, which are disadvantageous.

Der Einsatz von LEDs als Leuchtmittel hat zu neuen Mƶglichkeiten in der Beleuchtung von HaushaltsgerƤten gefĆ¼hrt, gleichzeitig stellt diese Technik die Konstrukteure vor neue Herausforderungen.The use of LEDs as light sources has led to new possibilities in the lighting of household appliances, while at the same time presenting the designers with new challenges.

Insbesondere bei GargerƤten fĆ¼r Nahrungsmittel, beispielsweise Backƶfen oder Dampfgarer, sind groƟe konstruktive Anstrengungen zu unternehmen, um eine Ɯberhitzung der LEDs und eine damit einhergehende SchƤdigung zu vermeiden. Hierzu muss nicht nur die LEDeigene WƤrme effektiv abgefĆ¼hrt werden. Es sind zudem MaƟnahmen zu treffen, um die durch den Garvorgang auf die LED einwirkenden Temperaturbelastungen zu minimieren.In particular, in cooking appliances for food, such as ovens or steamer, great constructive efforts must be made to prevent overheating of the LEDs and a concomitant damage. For this purpose, not only the LED's own heat must be dissipated effectively. In addition, measures must be taken to minimize the temperature stresses on the LED caused by the cooking process.

Die DE 10 2009 002 775 A1 soll als Beispiel fĆ¼r eine GargerƤteleuchte aus dem Stand der Technik dienen. In an sich Ć¼blicher Weise ist diese Leuchte in einem GehƤuseausschnitt Ć¼ber ein LeuchtengehƤuse gehalten. Die Lichtaustrittsƶffnung des LeuchtengehƤuses ist mit einem lichtdurchlƤssigen Abdeckelement versehen, welches den Leuchteninnenraum primƤr vor Verschmutzung schĆ¼tzt, jedoch auch bereits eine erste WƤrmebarriere darstellt. Das LeuchtengehƤuse trƤgt an seinem dem GargerƤteinnenraum abgewandten Ende ein zylindrisches Abstandselement, wobei die ZylindermantelflƤche von einem Reflektionsmaterial umgeben ist. Die ZylinderdeckflƤchen sind mit lichtdurchlƤssigen Deckelementen versehen. Dieser so gestaltete Zylinder dient einerseits dazu, die an seinem dem Garraum abgewandten Ende angeordnete LED mƶglichst weit vom Garraum zu beabstanden und durch diese erste MaƟnahme die WƤrmebelastung zu minimieren. DarĆ¼ber hinaus bilden die Deckelemente weitere Temperaturbarrieren. Der Zylinder selbst dient darĆ¼ber hinaus als Lichtschacht, um das von der LED emittierte Licht in Richtung Garraum zu fĆ¼hren. SchlieƟlich wird als weitere MaƟnahme die LED auf einen KĆ¼hlkƶrper montiert, so dass die BetriebswƤrme aber auch Ć¼ber die WƤrmebarrieren zur LED gelangene RestwƤrme abgefĆ¼hrt werden kann.The DE 10 2009 002 775 A1 should serve as an example of a cooking appliance lamp from the prior art. In per se usual way, this lamp is held in a housing cutout on a light housing. The light exit opening of the lamp housing is provided with a translucent cover, which protects the lamp interior primarily from contamination, but also already represents a first thermal barrier. The luminaire housing carries at its end facing away from the GargerƤteraum a cylindrical spacer element, wherein the cylinder jacket surface is surrounded by a reflection material. The cylinder cover surfaces are provided with translucent cover elements. On the one hand, this cylinder designed in this way serves to space the LED arranged at its end remote from the cooking chamber as far as possible from the cooking chamber and to minimize the heat load by means of this first measure. In addition, the cover elements form further temperature barriers. The cylinder itself also serves as a light well to guide the light emitted by the LED towards the cooking chamber. Finally, as a further measure, the LED is mounted on a heat sink, so that the heat of operation can also be dissipated via the heat barriers to LED residual heat.

Aus dem druckschriftlich nicht belegbaren Stand der Technik ist es darĆ¼ber hinaus bekannt, den zwischen der LED und der Lichtaustrittsƶffnung der Garrauminnenwand existierenden Hohlraum mit einem lichtdurchlƤssigen Isolationsmaterial zu versehen. So wird die dem Garraum entstammende WƤrmestrahlung minimiert und die Ausleuchtung des Innenraumes ermƶglicht.It is also known from the prior art document which can not be assigned by hand to provide the cavity existing between the LED and the light exit opening of the inner wall of the cooking chamber with a light-permeable insulating material. Thus, the heat radiation originating from the cooking chamber is minimized and the illumination of the interior space is made possible.

Im Stand der Technik vermindern die hier beschriebenen MaƟnahmen zur Beabstandung der LED vom Garraum und zur WƤrmeabschirmung die Lichtausbeute und die AusleuchtungsqualitƤt des HausgerƤteinnenraumes. Um die verminderte Lichtausbeute zu kompensieren kƶnnen leistungsstƤrkere LEDs eingesetzt werden, wobei deren hƶhere Betriebstemperatur problematisch ist.In the prior art, the measures described here for spacing the LED from the cooking chamber and for heat shielding reduce the luminous efficiency and the illumination quality of the domestic appliance interior. In order to compensate for the diminished light yield, more powerful LEDs can be used, whereby their higher operating temperature is problematic.

WO2009/141068 A1 oder EP 1598682 A2 nutzen Lichtleiter, um das Licht von einem Garraum entfernten Bereich in den Garraum hinein zu leiten. Die hierdurch hervorgerufene stark gerichtete Strahlung erfordert jedoch eine Vielzahl von Lichtaustrittsƶffnungen und - je nach technischer Umsetzung - eine Vielzahl von Lichtquellen und Lichtleitern. Hinzukommt, dass die Vielzahl punktueller Lichtquellen in der GehƤuseinnenwand mit ihrer sehr hohen Helligkeit als unangenehm empfunden wird, so dass solche Lƶsungen aus Kosten- und KomfortgrĆ¼nden ungern umgesetzt werden. WO2009 / 141068 A1 or EP 1598682 A2 use light guides to direct the light away from a cooking area in the oven into it. However, the highly directed radiation caused by this requires a large number of light exit openings and - depending on the technical implementation - a variety of light sources and light guides. In addition, the large number of point sources of light in the inner wall of the housing with its very high brightness is perceived as unpleasant, so that such solutions are reluctantly implemented for cost and comfort reasons.

SchlieƟlich werden fĆ¼r eine optimale Ausleuchtung des HaushaltsgerƤteinnenraumes, insbesondere bei GargerƤten gerne mehrere Leuchten in den GerƤteseitenwƤnden zwischen den fĆ¼r Tragelemente vorgesehenen Ebenen angeordnet. So ist jeder Tragelementebene bei Backƶfen beispielsweise jeder fĆ¼r ein Backblech vorgesehener Ebene eine Beleuchtung zugeordnet, so dass Abschattungen durch weitere Tragelemente die AusleuchtungsqualitƤt der jeweiligen Ebene nicht beeintrƤchtigen.Finally, for optimum illumination of the household appliance interior, especially in cooking appliances, several lights are arranged in the device side walls between the planes provided for supporting elements. Thus, each support element level in ovens, for example, each associated with a baking tray level associated with lighting, so that Shading by other support elements do not affect the illumination quality of each level.

Aufgrund genormter AuƟenmaƟe und dem Ziel, den nutzbaren Innenraum des GargerƤtes mƶglichst groƟ zu halten, sind die hinter den seitlichen InnenwƤnden vorhandenen BaurƤume ausgesprochen begrenzt. Dies erschwert die Konstruktion von HausgerƤteleuchten fĆ¼r GargerƤte unter der Nutzung von LEDs, da der dem Temperaturschutz dienende Abstand zwischen Garraum und LED begrenzt ist.Due to standardized external dimensions and the aim of keeping the usable interior of the cooking appliance as large as possible, the space available behind the lateral inner walls are extremely limited. This complicates the design of home appliance lighting for cooking appliances using LEDs, since the temperature protection serving distance between the oven and LED is limited.

Insofern lassen sich insbesondere bei der Positionierung einer HausgerƤteleuchte hinter der Seitenwand eines Garraumes die im Stand der Technik konstruktionsbedingten Lichtverluste nicht ohne weiteres durch leistungsfƤhigere LEDs ausgleichen, da diese in der Regel eine sehr viel hƶhere BetriebswƤrme produzieren.In this respect, in particular when positioning a domestic appliance light behind the side wall of a cooking chamber, the light losses due to design in the prior art can not be readily compensated for by more powerful LEDs, since these generally produce a much higher operating heat.

Die US 2015/0009705 A1 zeigt eine sogenannte Retrofitlampe, die dem Ersatz herkƶmmlicher Entladungs- oder GlĆ¼hlampen durch LED-Lampen dient. der Schwerpunkt der Offenbarung beschƤftigt sich mit verschiedenen Lichtleitelementen, die das von einer LED emittierte Licht aufnehmen, die WellenlƤnge des Lichts verƤndern und es gezielt wieder abgeben.The US 2015/0009705 A1 shows a so-called retrofit lamp, which is used to replace conventional discharge or incandescent lamps by LED lamps. The focus of the disclosure deals with various light-guiding elements, which receive the light emitted by an LED light, change the wavelength of the light and give it targeted again.

In der US 2012/0147624 A1 ist ebenfalls eine sogenannte Retrofitlampe gezeigt, die fĆ¼r den Einsatz in Leuchten mit herkƶmmlichen Fassungen wie E27 vorgesehen sind. Eine im Lampensockel sitzende LED gibt ihr Licht an einen Lichtleiter ab, welcher das Licht in einen Reflektorraum hineinfĆ¼hrt. Eine die Lichtaustrittsƶffnung des Reflektorraumes abdeckende Streulinse ist unmittelbar oberhalb des Lichtleiterendes mit einer reflektierend wirkenden Linse versehen. In Folge dessen wird das den Lichteiter an seinem Ende verlassende Licht einer Totalreflektion in den Reflektorraum hinein unterworfen und gelangt erst durch die Reflektorwirkung aus der Lichtaustrittƶffnung des Reflektors hinaus.In the US 2012/0147624 A1 Also shown is a so-called retrofit lamp, which are intended for use in luminaires with conventional sockets such as E27. An LED sitting in the lamp base emits its light to a light guide, which leads the light into a reflector space. A scattering lens covering the light exit opening of the reflector space is provided with a reflective lens directly above the light guide end. As a result, the light leaving the light guide at its end becomes total reflection subjected to the reflector space and only passes through the reflector effect of the light exit opening of the reflector.

US 2016/0047966 A1 zeigt eine HausgerƤteleuchte, bei welcher das von einer LED emittierte Licht von einem Reflektor gebĆ¼ndelt wird und anschlieƟend Ć¼ber eine Linse an einen Lichtleiter eingespeist wird. Der Lichtleiter ist in einer GerƤtewand eingelassen und mit Strukturen zur Lichtbrechung versehen. Ɯber diese Strukturen wird das Licht aus dem Lichtleiter herausgelenkt, um einen GerƤteinnenraum zu beleuchten. US 2016/0047966 A1 shows a household appliance lamp, in which the light emitted by an LED light is focused by a reflector and is then fed via a lens to a light guide. The light guide is embedded in a device wall and provided with structures for refraction. Through these structures, the light is deflected out of the light guide to illuminate a device interior.

US 2016/0131818 A1 offenbart eine Beleuchtungseinrichtung fĆ¼r die BodendĆ¼se eines Staubsaugers. Ein parallel zur Ɩffnungsebene von Lichtaustrittƶffnungen gefĆ¼hrter Lichtleiter ist mit lichtbrechenden Strukturen versehen, welche fĆ¼r einen Lichtaustritt aus den Lichtaustrittƶffnungen sorgen. Eine LED speist Licht in den Lichtleiter ein. US 2016/0131818 A1 discloses a lighting device for the floor nozzle of a vacuum cleaner. A guided parallel to the opening plane of the light exit openings optical fiber is provided with refractive structures, which provide for a light exit from the light exit openings. An LED feeds light into the light guide.

In US 6 350 041 B1 ist eine Lampe offenbart, die sich ebenfalls einer LED und eines Lichtleiters bedient. Das Lichtaustrittsende des Lichtleiters ist derart geformt, dass eine mƶglichst hohe Lichtstreuung erreicht wird. ein GroƟteil des das Lichtaustrittsende verlassenden Lichtes wird auf einen Reflektor geworfen und von diesem wiederum zur Lichtaustrittsƶffnung eines Reflektorraumes gefĆ¼hrt.In US Pat. No. 6,350,041 B1 discloses a lamp that also uses an LED and a light guide. The light exit end of the light guide is shaped so that the highest possible light scattering is achieved. a large part of the light exit end leaving light is thrown onto a reflector and this in turn led to the light exit opening of a reflector space.

SchlieƟlich zeigt EP 2 428 737 A1 eine Leuchte zur Beleuchtung eines Kochfeldes. Als Lichtquelle wird eine Halogenlampe genutzt, welche geneigt in Relation zum Reflektor angeordnet ist. Die Neigung der Lampe hat einen sich asymmetrisch ƶffnenden Lichtkegel zur Folge.Finally shows EP 2 428 737 A1 a luminaire for lighting a hob. As a light source, a halogen lamp is used, which is arranged inclined in relation to the reflector. The inclination of the lamp results in an asymmetrically opening cone of light.

Aufgabe der Erfindung ist es unter Nutzung einer LED, eine kompakt bauende HausgerƤteleuchte fĆ¼r GargerƤte bereit zu stellen, deren effektiv fĆ¼r die Innenraumausleuchtung nutzbare Lichtleistung maximiert ist. Gelƶst wird die Erfindungsaufgabe von eine HausgerƤteleuchte mit den Merkmalen des Anspruchs 1, insbesondere mit dessen kennzeichnenden Merkmalen, wonach

  • das Abstandelement ein materialeinheitlicher Lichtleiter ist, welcher das Licht aufnimmt und bĆ¼ndelt,
  • die gesamte LichtaustrittsflƤche des Lichtleiters relativ zu einer Mittelachse des Lichtleiters mit einer einheitlichen Neigung versehen ist und so die Kegelachse des aus der LichtaustrittsflƤche austretende Lichtkegels ebenfalls relativ zur Mittelachse des Lichtleiters geneigt ist
  • das Reflektionsmittel ein Reflektor ist, welcher einen Reflektorraum aufspannt,
  • der Lichtleiter in den Reflektorraum hineingefĆ¼hrt ist
  • der Reflektor im Wesentlichen die aus dem Lichtleiter austretende Streustrahlung in Richtung Abdeckung lenkt.
The object of the invention, using an LED, to provide a compact household appliance light for cooking appliances, whose effectively usable for the interior lighting light output is maximized. The object of the invention is solved by a domestic appliance lamp with the features of claim 1, in particular with its characterizing features, according to which
  • the spacer element is a material-uniform light guide, which receives the light and bundles,
  • the entire light exit surface of the light guide is provided with a uniform inclination relative to a central axis of the light guide and so the cone axis of the emerging from the light exit surface light cone is also inclined relative to the central axis of the light guide
  • the reflection means is a reflector which spans a reflector space,
  • the light guide is guided into the reflector space
  • the reflector essentially directs the scattered radiation emerging from the light guide in the direction of the cover.

Der wesentliche Vorteil der erfindungsgemƤƟen HaushaltsgerƤteleuchte ist darin zu sehen, dass zwei unterschiedliche, lichtbeeinflussende Bauteile zur Maximierung der Lichtausbeute genutzt werden. Mittels des materialeinheitlichen Lichtleiters, beispielsweise eines aus Kunststoff oder Glas bestehenden Lichtleitstabes, also einem aus Vollmaterial bestehenden Lichtleiter, wird das Licht der LED aufgenommen, gebĆ¼ndelt und mit geringstmƶglichen Streuverlusten nahe an die Lichtaustrittsƶffnung des LeuchtengehƤuses, also nahe an die Innenwand des HausgerƤteinnenraumes herangefĆ¼hrt. Dabei befindet sich der Lichtleiter zumindest Abschnittsweise im Reflektorraum, so dass die aus dem Lichtleiter austretende Streustrahlung aufgenommen und ebenfalls in Richtung Lichtaustrittsƶffnung des LeuchtengehƤuses, also in Richtung HausgerƤteinnenraum gelenkt wird. Gleichzeitig ermƶglicht der Lichtleiter eine weitest mƶgliche Beabstandung der LED vom HausgerƤteinnenraum und dient der WƤrmeabschirmung. Ebenfalls der WƤrmeabschirmung dient der Reflektor, welcher nicht nur das Streulicht, sondern auch aus dem GerƤteinnenraum eintretende WƤrmestrahlung reflektiert.The main advantage of the household appliance according to the invention is the fact that two different light-influencing components are used to maximize the light output. By means of the material-uniform light guide, for example one made of plastic or glass existing Lichtleitstabes, ie an existing light source of solid material, the light of the LED is recorded, bundled and brought with the lowest possible stray losses close to the light exit opening of the lamp housing, so close to the inner wall of the domestic appliance interior. In this case, the optical waveguide is at least partially in the reflector space, so that the scattered radiation emerging from the optical waveguide is received and also directed in the direction of the light exit opening of the luminaire housing, ie in the direction of the domestic appliance interior. At the same time, the light guide allows the widest possible spacing of the LED from the household appliance interior and serves for heat shielding. Also, the heat shield is the reflector, which reflects not only the scattered light, but also from the device interior entering heat radiation.

Um eine blendfreie Ausleuchtung des GerƤteinnenraumes zu erzeugen, ist die LichtaustrittsflƤche des Lichtleiters relativ zu einer Mittelachse des Lichtleiters geneigt. In Folge dessen ist die Kegelachse des aus der LichtaustrittsflƤche austretende Lichtkegels ebenfalls relativ zur Mittelachse des Lichtleiters geneigt, wobei in der Anwendung die LichtaustrittsflƤche vom Benutzer weg weist, also in Richtung beispielsweise der GarraumrĆ¼ckwand geneigt ist. Durch die geneigte LichtaustrittsflƤche wird der austretende Lichtkegel in den GerƤteinnenraum hineingeschwenkt, was sich durch eine entsprechende Neigung der Kegelachse - welche der Kegelspitze entspringt und durch das Zentrum des Kegelbodens verlƤuft - ausdrĆ¼ckt. Der Kegelmantel des austretenden Lichtkegels wird durch den Abstrahlwinkel (gleich Halbwertswinkel) der LichtaustrittsflƤche bestimmt.In order to produce a glare-free illumination of the device interior, the light exit surface of the light guide is inclined relative to a central axis of the light guide. As a result, the cone axis of the emerging from the light exit surface light cone is also inclined relative to the central axis of the light guide, wherein in the application, the light exit surface facing away from the user, that is inclined in the direction of, for example, the cooking chamber rear wall. Due to the inclined light exit surface of the emerging light cone is pivoted into the device interior, which is expressed by a corresponding inclination of the cone axis - which rises from the cone tip and extends through the center of the cone bottom - expresses. The conical surface of the emerging light cone is determined by the emission angle (equal to the half-value angle) of the light exit surface.

Der Reflektor dient im Wesentlichen dazu, dass sonst als Verluststrahlung geltende, nicht im HausgerƤteinnenraum ankommende Streulicht einzufangen, welches unvermeidlich aus der MantelflƤche des Lichtleiters austritt.Essentially, the reflector serves to capture stray light which is otherwise applicable as loss radiation and does not arrive in the domestic appliance interior, which inevitably emerges from the lateral surface of the light guide.

Vorgesehen ist weiterhin, dass der Reflektor das Streulicht weit Ć¼berwiegend in Richtung der Kegelachse des aus der LichtaustrittsflƤche des Lichtleiters austretenden Lichtkegels lenkt, damit auch eine durch das reflektierte Streulicht hervorgerufene Blendwirkung des Benutzer weitestgehend vermieden wird.It is furthermore provided that the reflector deflects the scattered light largely predominantly in the direction of the cone axis of the light cone emerging from the light exit surface of the light guide, so that a dazzling effect of the user caused by the reflected scattered light is largely avoided.

Es ist vorgesehen, dass der Reflektor zwei einer Scheitelachse entspringende, bahnfƶrmige ReflektionsflƤchen aufweist, wobei die Scheitelachse nahe einer LichteintrittsflƤche des Lichtleiters angeordnet ist. Diese Anordnung nahe der LichteintrittsflƤche des Lichtleiters stellt sicher, dass das prinzipbedingt aus dem Lichtleiter austretende Streulicht vom Reflektor aufgefangen wird.It is envisaged that the reflector has two web-shaped reflecting surfaces which emerge from a vertex axis, wherein the vertex axis is arranged near a light entry surface of the optical waveguide. This arrangement near the light entry surface of the light guide ensures that the scattered light emerging from the light guide in principle is absorbed by the reflector.

Insbesondere ist vorgesehen, dass die erste, bahnfƶrmige ReflektionsflƤche um eine zur Scheitelachse parallele KrĆ¼mmungsachse gekrĆ¼mmt ist, wobei vorgesehen sein kann, dass der lichteintrittsflƤchennahe Bereich unterhalb einer Ebene liegt, in der die Randstrahlen des durch den Abstrahlwinkel der LED definierten Strahlenkegels auf die GrenzflƤchen des Lichtleitermantels treffen.In particular, it is provided that the first, sheet-shaped reflection surface is curved about an axis of curvature parallel to the apex axis, wherein it can be provided that the area near the light entrance surface lies below a plane in which the marginal rays of the beam cone defined by the emission angle of the LED on the boundary surfaces of the light guide shell to meet.

Hierdurch ist gewƤhrleistet, dass ein Maximum des Streulichts aufgefangen und in Richtung HausgerƤteinnenraum reflektiert wird.This ensures that a maximum of scattered light is collected and reflected towards the home appliance interior.

Vorgesehen ist weiterhin, dass der Lichtleiter zur Scheitelachse der ReflektionsflƤchen seitlich versetzt ist, wobei zusƤtzlich vorgesehen sein kann, dass die geneigte LichtaustrittsflƤche des Lichtleiters in Richtung des seitlichen Versatzes abfƤllt. Vorgesehen ist weiterhin, dass die zweite bahnfƶrmige ReflektionsflƤche ungekrĆ¼mmt, insbesondere plan ist und an den lichteintrittsflƤchennahen Ɯbergangsbereich von LichtaustrittsflƤche und LichtleitermantelflƤche gefĆ¼hrt ist, wobei die Neigung der zweiten ReflektionsflƤche in Bezug auf die Kegelachse des aus der LichtaustrittflƤche austretenden Lichtkegels im Wesentlichen zur Wirkungslosigkeit der zweiten ReflektionsflƤche fĆ¼hrt.It is further provided that the light guide is laterally offset to the apex axis of the reflection surfaces, wherein it can additionally be provided that the inclined light exit surface of the light guide in the direction of the lateral offset decreases. It is furthermore provided that the second sheet-shaped reflection surface is non-curved, in particular flat, and guided to the light entry area near the light entry surface and light guide surface, wherein the inclination of the second reflection surface with respect to the cone axis of the emerging from the light exit surface light cone substantially to the inefficiency of the second reflection surface leads.

Der Versatz des Lichtleiters zur Scheitelachse, insbesondere ein Versatz von der ersten ReflektionsflƤche weg bewirkt eine stƤrkere Streulichtausbeute durch die erste ReflektionsflƤche. Bei der oben angesprochenen entsprechenden Neigung der LichtaustrittsflƤche wird das aus der LichtaustrittsflƤche austretende Direktlicht wie auch das vom Reflektor zurĆ¼ckgeworfene Streulicht in etwa Richtungsgleich in den HausgerƤteinnenraum gefĆ¼hrt.The offset of the light guide to the apex axis, in particular an offset from the first reflection surface away causes a stronger scattered light output by the first reflection surface. In the above-mentioned corresponding inclination of the light exit surface emerging from the light exit surface direct light as well as the reflected back from the reflector scattered light is guided in approximately the same direction in the home appliance interior.

Es ist weiterhin vorgesehen, dass die zweite bahnfƶrmige ReflektionsflƤche ungekrĆ¼mmt ist und an den lichteintrittsflƤchennahen Ɯbergangsbereich von LichtaustrittsflƤche und LichtleitermantelflƤche gefĆ¼hrt ist, wobei die Neigung der zweiten ReflektionsflƤche in Bezug auf die Kegelachse des aus der LichtaustrittflƤche austretenden Lichtkegels im Wesentlichen zur Wirkungslosigkeit der zweiten ReflektionsflƤche fĆ¼hrt.It is further provided that the second sheet-like reflection surface is not curved and is guided to the light entry surface near transition region of the light exit surface and light guide surface, wherein the inclination of the second reflection surface with respect to the cone axis of the light exit surface emerging light cone essentially leads to the inefficiency of the second reflection surface.

Auf diese Weise ist bei entsprechender Einbaulage der Leuchte gewƤhrleistet, dass das Licht ausschlieƟlich im Wesentlichen in Richtung der HausgerƤterĆ¼ckwand, insbesondere der GarraumrĆ¼ckwand eines GargerƤtes gefĆ¼hrt ist.In this way, with appropriate mounting position of the lamp ensures that the light is guided exclusively substantially in the direction of the appliance appliance rear wall, in particular the cooking chamber rear wall of a cooking appliance.

Ferner ist vorgesehen, dass der Reflektor und die Eintauchtiefe des Lichtleiters in den Reflektorraum derart aufeinander abgestimmt sind, dass der Reflektor lediglich die aus dem Lichtleiter austretende Streustrahlung, nicht jedoch aus der LichtaustrittsflƤche austretende Direktstrahlung reflektiert.It is further provided that the reflector and the immersion depth of the light guide are matched to one another in the reflector space in such a way that the reflector merely transmits the scattered radiation emerging from the light guide. but not reflected from the light exit surface emerging direct radiation.

Weitere Vorteile so wie ein besseres VerstƤndnis der Erfindung folgen aus der Beschreibung eines AusfĆ¼hrungsbeispiels. Es zeigen:

Figur 1
die Explosionsansicht einer erfindungsgemƤƟen Leuchte,
Figur 2
eine Schnittansicht der Leuchte gemƤƟ Figur 1,
Figur 3
eine schematische Darstellung der Abstrahlcharakteristik der Leuchte gemƤƟ Figur 1 ohne den erfindungsgemƤƟen Reflektor an Hand einer Schnittdarstellung,
Figur 4
eine schematische Darstellung der Abstrahlcharakteristik der Leuchte gemƤƟ Figur 1 unter BerĆ¼cksichtigung des erfindungsgemƤƟen Reflektors,
Figur 5
ein Ofen mit erfindungsgemƤƟer HausgerƤteleuchte in perspektivischer Ansicht,
Figur 6
der Ofen gemƤƟ Figur 5 in Ansicht von vorne,
Figur 7
eine Schnittdarstellung des Ofens gemƤƟ Schnittlinie B-B in Figur 6,
Figur 8
eine AusschnittvergrĆ¶ĆŸerung gemƤƟ Ausschnittskreis VII in Fig. 7.
Further advantages as well as a better understanding of the invention follow from the description of an embodiment. Show it:
FIG. 1
the exploded view of a lamp according to the invention,
FIG. 2
a sectional view of the lamp according to FIG. 1 .
FIG. 3
a schematic representation of the radiation characteristic of the lamp according to FIG. 1 without the reflector according to the invention with reference to a sectional view,
FIG. 4
a schematic representation of the radiation characteristic of the lamp according to FIG. 1 taking into account the reflector according to the invention,
FIG. 5
an oven with domestic appliance light according to the invention in a perspective view,
FIG. 6
the oven according to FIG. 5 in front view,
FIG. 7
a sectional view of the furnace according to section line BB in FIG. 6 .
FIG. 8
a detail enlargement according to section circle VII in Fig. 7 ,

In den Figuren ist eine HausgerƤteleuchte, auch einfach nur Leuchte genannt, insgesamt mit der Bezugsziffer 10 versehen. Die HausgerƤteleuchte umfasst, wie aus Figur 1 zu erkennen ist, zunƤchst einen KĆ¼hlkƶrper 11, auf welchem eine Platine 12 mit aufgesetzter LED 13 (Figur 2) platziert ist.In the figures, a household appliance light, also called just light, total provided with the reference numeral 10. The home appliance light includes, as out FIG. 1 it can be seen, first a heat sink 11 on which a board 12 with attached LED 13 (FIG. FIG. 2 ) is placed.

Auf dem KĆ¼hlkƶrper ist weiterhin ein LeuchtengehƤuse 14 aus einem elektrisch und thermisch isolierenden Material, wie beispielsweise Kunststoff oder Keramik, angeordnet, innerhalb dessen ein Lichtleiter 15 gehalten wird. Im vorliegenden AusfĆ¼hrungsbeispiel handelt es sich um einen stabfƶrmigen Lichtleiter aus Glas. Dieser verfĆ¼gt Ć¼ber eine LEDnahe LichteintrittsflƤche 16 (Figur 2) sowie eine LED-ferne LichtaustrittsflƤche 17. Die LichtaustrittsflƤche 17 ist hinsichtlich einer Mittelachse des Lichtleiters 15 geneigt. In Bezug auf die Platine 12 weist sie eine nach unten, zur Platine 12 weisende Neigung auf. Im Ɯbrigen ist die LichtaustrittsflƤche eben gehalten.On the heat sink, a light housing 14 made of an electrically and thermally insulating material, such as plastic or ceramic, is arranged, within which a light guide 15 is held. In the present embodiment, it is a rod-shaped optical fiber made of glass. This has an LED near light entrance surface 16 ( FIG. 2 ) and a LED-distant light exit surface 17. The light exit surface 17 is inclined with respect to a central axis of the light guide 15. With respect to the board 12, it has a downward, to the board 12 facing slope. Incidentally, the light exit surface is kept flat.

Das LeuchtengehƤuse 14 verfĆ¼gt Ć¼ber Rastausnehmungen 18, mittels derer ein Rastfeder 19 aufweisender Reflektor 20 am LeuchtengehƤuse 14 verankerbar ist. Der Reflektor 20 seinerseits bildet eine nicht nƤher bezeichnete Lichtaustrittsƶffnung der Leuchte 10, welche durch ein lichtdurchlƤssiges Abdeckelement 21, im AusfĆ¼hrungsbeispiel eine Glasscheibe 22, verschlossen ist. SchlieƟlich verfĆ¼gt der Reflektor 20 Ć¼ber Rastelemente R, mit welchen er in einem Ausschnitt einer GerƤtewand festgelegt wird.The luminaire housing 14 has latching recesses 18, by means of which a latching spring 19 exhibiting reflector 20 is anchored to the lamp housing 14. The reflector 20 in turn forms an unspecified light exit opening of the lamp 10, which is closed by a translucent cover 21, in the embodiment, a glass pane 22. Finally, the reflector 20 has locking elements R, with which it is fixed in a section of a device wall.

Zur Leuchte gehƶrt im AusfĆ¼hrungsbeispiel darĆ¼ber hinaus Anschlussleiter 23, die mit ihren ersten Enden in nicht dargestellter Weise Leiterbahnen der Platine 12 kontaktieren und deren der Platine 12 abgewandte Enden einen Steckverbinder 24 zum Anschluss an die Spannungsversorgung tragen.In addition to the luminaire in the exemplary embodiment, connection conductor 23 also contacts printed conductors of circuit board 12 with their first ends in a manner not shown, and their ends facing away from circuit board 12 carry a connector 24 for connection to the power supply.

Figur 2 zeigt die in Figur 1 dargestellte Leuchte 10 in einer Schnittansicht. Dieser Schnittansicht ist zu entnehmen, dass der Reflektor 20 eine erste ReflektionsflƤche 25 und eine zweite ReflektionsflƤche 26 ausbildet. Diese ReflektionsflƤchen 25/26 bilden, gemeinsam mit den ReflektorseitenwƤnden 27 den Reflektorraum 29 und entspringen einer gemeinsamen Scheitelachse 28. Die ReflektionsflƤchen 25/26 sind bahnartig geformt, wobei die erste ReflektionsflƤche 25 um eine KrĆ¼mmungsachse (nicht dargestellt) gekrĆ¼mmt ist. Die KrĆ¼mmungsachse der ersten ReflektionsflƤche 25 liegt parallel zur Scheitelachse 28. Die zweite ReflektionsflƤche 26 bildet eine, der Scheitelachse 28 entspringende SchrƤgflƤche. Die Scheitelachse 28 liegt auf der Leuchtenmittelachse LM, die sich durch das Zentrum der LeuchtengehƤusebodenflƤche und durch das Zentrum des Abdeckelementes 21 sich erstreckt. FIG. 2 shows the in FIG. 1 illustrated lamp 10 in a sectional view. This sectional view shows that the reflector 20 forms a first reflection surface 25 and a second reflection surface 26. These Reflection surfaces 25/26, together with the reflector side walls 27, the reflector space 29 and spring from a common apex axis 28. The reflection surfaces 25/26 are web-shaped, wherein the first reflection surface 25 about a curvature axis (not shown) is curved. The axis of curvature of the first reflection surface 25 lies parallel to the apex axis 28. The second reflection surface 26 forms an inclined surface projecting from the apex axis 28. The apex axis 28 lies on the lamp central axis LM, which extends through the center of the lamp housing base surface and through the center of the cover 21.

Der Lichtleiter 15 erstreckt sich in den Reflektorraum 29 hinein und ist mit seiner LƤngsachse LA seitlich versetzt zur Leuchtenmittelachse LM angeordnet. Die LichtaustrittsflƤche ist in Versatzrichtung nach unten in Richtung Platine 12 geneigt und plan ausgebildet. Hinsichtlich der ReflektionsflƤchen 25 und 26 ist der Lichtleiter 15 von der ersten, gekrĆ¼mmten ReflektionsflƤche 25 weg in Richtung zweiter ReflektionsflƤche 26 versetzt.The light guide 15 extends into the reflector space 29 and is arranged with its longitudinal axis LA laterally offset from the light center axis LM. The light exit surface is inclined in the direction of offset downwards in the direction of board 12 and flat. With regard to the reflection surfaces 25 and 26, the light guide 15 is offset away from the first, curved reflection surface 25 in the direction of the second reflection surface 26.

In Folge dieses Versatzes und der KrĆ¼mmung der ersten ReflektionsflƤche 25 sowie der Ausbildung der zweiten ReflektionsflƤche 26 als SchrƤgflƤche trifft die erste ReflektionsflƤche 25 lichteintrittsflƤchennah auf den Lichtleiter 15. Die zweite ReflektionsflƤche 26 hingegen trifft lichteintrittsflƤchenfern auf den Lichtleiter 25. Im Idealfall liegt der tiefste Punkt der in Richtung Platine 12 geneigten LichtaustrittsflƤche in der von der zweiten ReflektionsflƤche 26 aufgespannten Ebene. Durch diese spezielle Ausbildung -den asymmetrisch ausgebildete Reflektor 20 mit seiner ersten, gekrĆ¼mmten ReflektionsflƤche 25 und seiner zweiten, als SchrƤgflƤche ausgebildeten ReflektionsflƤche 26 dem seitlichen Versatz des Lichtleiters 15 zur Leuchtenmittelachse LM und der geneigten LichtaustrittsflƤche 16 - wird eine spezielle Abstrahlcharakteristik der HausgerƤteleuchte 10 bewirkt, welche im Folgenden erlƤutert wird.As a result of this offset and the curvature of the first reflection surface 25 as well as the formation of the second reflection surface 26 as an inclined surface, the first reflection surface 25 strikes the light guide 15 near the light entrance surface. The second reflection surface 26, on the other hand, strikes the light guide 25. In the ideal case, the lowest point is in the direction of board 12 inclined light exit surface in the plane defined by the second reflection surface 26 plane. Due to this special design -the asymmetrically designed reflector 20 with its first, curved reflection surface 25 and its second, designed as an inclined surface reflection surface 26, the lateral offset of the light guide 15 to the lamp center axis LM and the inclined Light exit surface 16 - a special radiation characteristic of the household appliance lamp 10 is effected, which will be explained below.

Figur 3 zeigt eine der Figur 2 entlehnte Darstellung, bei welcher zur Verdeutlichung der nachfolgend erlƤuterten Sachverhalte der Reflektor 20 samt Abdeckglas 22 weggelassen wurde. Die in Figur 3 gezeigten strichpunktierten Linien stellen symbolisch exemplarische Lichtstrahlen dar, die von der LED 13 emittiert werden. ZunƤchst sind in Figur 3 mit D bezeichnete Lichtstrahlen gezeigt, die aus der LichtaustrittsflƤche 17 austreten und als sogenanntes Direktlicht bezeichnet werden. Dieses Direktlicht D verlƤsst die LichtaustrittsflƤche 17 in einem bestimmten Abstrahlwinkel, der den Ɩffnungswinkel des die LichtaustrittsflƤche 17 verlassenden Lichtkegels bildet. FIG. 3 shows one of the FIG. 2 borrowed representation in which the reflector 20 and cover glass 22 has been omitted for clarity of the facts explained below. In the FIG. 3 shown dotted lines represent symbolically exemplary light rays emitted by the LED 13. First, in FIG. 3 D rays of light denoted by D emerge from the light exit surface 17 and are referred to as so-called direct light. This direct light D leaves the light exit surface 17 in a certain emission angle, which forms the opening angle of the light cone leaving the light exit surface 17.

Dargestellt sind weiterhin exemplarische Lichtstrahlen S, welche aufgrund ihres Einfallswinkels an der LichtaustrittsflƤche 17 reflektiert, in den Lichtleiter 15 zurĆ¼ckgeworfen werden und aus dessen MantelflƤche austreten. Diese mit S bezeichneten Lichtstrahlen stellen das sogenannte Streulicht dar. Figur 3 zeigt, dass dieses Streulicht S statt in Richtung der nicht eingezeichneten, die Lichtaustrittsƶffnung der Leuchte 10 abdeckenden Glasscheibe 22 zurĆ¼ck in Richtung des LeuchtengehƤuses 14 geworfen werden. Sie stehen somit nicht zur Ausleuchtung des HausgerƤteinnenraumes zur VerfĆ¼gung und kƶnnen durchaus als Verluststrahlung bezeichnet werden.Also shown are exemplary light beams S which, due to their angle of incidence, are reflected at the light exit surface 17, reflected back into the light guide 15 and exit from its lateral surface. These light rays designated S represent the so-called scattered light. FIG. 3 shows that this scattered light S instead of in the direction of the not shown, the light exit opening of the lamp 10 covering glass pane 22 are thrown back in the direction of the lamp housing 14. They are thus not available for illuminating the domestic appliance interior and can be described as loss radiation.

In Figur 3 ist auch ersichtlich, dass die punktiert dargestellte Kegelachse K des den Lichtleiter 15 verlassenden Lichtkegels aufgrund der Neigung der LichtaustrittsflƤche 17 von der Vertikalen in Neigungsrichtung verkippt ist. In Folge dessen wird das den Lichtleiter 15 verlassende Licht im Wesentlichen von Leuchtenmittelachse LM bzw. LichtleiterlƤngsachse LA weg gerichtet.In FIG. 3 It can also be seen that the cone axis K shown in dotted lines of the light cone leaving the light guide 15 is tilted in the tilting direction due to the inclination of the light exit surface 17 from the vertical. As a result, the light leaving the light guide 15 is directed substantially away from the light center axis LM or light guide longitudinal axis LA.

Figur 4 entspricht im Wesentlichen Figur 2, wobei auch hier exemplarisch strichpunktierte Linien eingezeichnet sind, die fĆ¼r die LED 13 verlassenden Lichtstrahlen stehen. An Hand von Figur 4 kann sehr gut die Wirkung des Reflektors erlƤutert werden. FIG. 4 essentially corresponds FIG. 2 , where also dashed lines are shown here by way of example, which are for the LED 13 leaving light beams. Based on FIG. 4 can be explained very well the effect of the reflector.

Wie Figur 4 zu entnehmen ist, werden die Streulichtstrahlen S von der ersten, gekrĆ¼mmten ReflektionsflƤche 25 aufgenommen und in Richtung Abdeckelement 21 und somit in Richtung Lichtaustrittsƶffnung der Leuchte 10 geworfen. Die KrĆ¼mmung der ReflektionsflƤche ist so bemessen, dass sie das Streulicht in Versatzrichtung des Lichtleiters 15, also im Wesentlichen in Richtung der Kegelachse K werfen. Dabei nimmt die erste ReflektionsflƤche 25 lediglich das Streulicht S zur Reflektion auf, das aus dem Lichtleiter 15 austretende Direktlicht D trifft aufgrund der Anordnung des Lichtleiters 15 innerhalb des Reflektionsraumes 29 nicht auf die erste ReflektionsflƤche 25.As FIG. 4 can be seen, the scattered light rays S are taken from the first, curved reflection surface 25 and thrown in the direction of cover 21 and thus in the direction of the light exit opening of the lamp 10. The curvature of the reflection surface is dimensioned so that they throw the scattered light in the direction of offset of the light guide 15, ie substantially in the direction of the cone axis K. In this case, the first reflection surface 25 only receives the scattered light S for reflection, the direct light D emerging from the light guide 15 does not strike the first reflection surface 25 due to the arrangement of the light guide 15 within the reflection space 29.

Die zweite ReflektionsflƤche 26 ist aufgrund ihrer Lage und Neigung zum Lichtleiter 15 funktionslos und reflektiert somit kein Licht. Dies ist insofern fĆ¼r die Gesamtabstrahlcharakteristik der Leuchte 10 relevant als die zweite ReflektionsflƤche 26, sofern sie eine reflektierende Funktion ausfĆ¼llen wĆ¼rde das Licht gegen die Kegelachse K reflektierte.Due to its position and inclination to the light guide 15, the second reflection surface 26 is inoperative and thus does not reflect any light. This is insofar relevant to the overall radiation characteristic of the luminaire 10 as the second reflection surface 26, provided that it would perform a reflective function which reflected light against the cone axis K.

Wie aus Figur 4 schlieƟlich auch ersichtlich ist, fĆ¼hrt der Versatz des Lichtleiters 15 relativ zur Leuchtenmittelachse LM dazu, dass die in Richtung erste ReflektionsflƤche 25 weisende MantelflƤche maximiert und somit die Ausnutzung des Streulichtes S unter BerĆ¼cksichtigung der gewĆ¼nschten Reflektionsrichtung zur Kegelachse K optimiert wird. Dass die Lichtaustrittsƶffnung der HausgerƤteleuchte 10 bzw. das Abdeckelement 21 verlassende Licht bildet ein StrahlenbĆ¼ndel, welches ebenfalls insgesamt in Versatzrichtung des Lichtleiters 15 verkippt ist und somit eine Neigung aufweist.How out FIG. 4 Finally, it can also be seen, the offset of the light guide 15 relative to the light center axis LM causes the direction in the first reflection surface 25 facing lateral surface maximizes and thus the utilization of the scattered light S is optimized taking into account the desired reflection direction to the cone axis K. That the light exit opening of the household appliance lamp 10 or the cover 21 leaving light forms a beam, which is also tilted in total in the offset direction of the light guide 15 and thus has a tendency.

Wenn nun die erfindungsgemƤƟe Leuchte derart in ein HausgerƤt, insbesondere ein GargerƤt eingebaut wird, dass die erste ReflektionsflƤche 25 von einer Innenraumƶffnung wegweist, diese also die Streulichtstrahlen S in den HausgerƤteinnenraum hineinrichtet und somit auch die Kegelachse K des die LichtaustrittsflƤche 17 verlassenden Lichtkegels in den HausgerƤteinnenraum hineingerichtet ist, wird eine Blendwirkung eines Benutzers wirksam vermieden.Now, if the luminaire according to the invention is installed in a domestic appliance, in particular a cooking appliance, that the first reflection surface 25 points away from an interior opening, so this scatters the scattered light rays S in the domestic appliance interior and thus the cone axis K of the light exit surface 17 leaving light cone in the domestic appliance interior is directed, a dazzling effect of a user is effectively avoided.

Um die Lichtausbeute der HausgerƤteleuchte 10 weiter zu optimieren, sind die Befestigungsarme 30, welche in Lichtleiternuten 31 eingreifen und den Lichtleiter 15 im LeuchtengehƤuse 14 halten in einem Bereich des Lichtleiters 15 angeordnet, in welchem aufgrund des gegebenen LED-Abstrahlwinkels keine Lichtstrahlen auftreffen. Hierdurch ist sichergestellt, dass die LichtfĆ¼hrung des Lichtleiters 15 nicht nachteilig beeinflusst wird.In order to further optimize the luminous efficacy of the domestic appliance lamp 10, the fastening arms 30, which engage in light guide grooves 31 and hold the light guide 15 in the luminaire housing 14, are arranged in a region of the light guide 15 in which no light rays impinge due to the given LED radiation angle. This ensures that the light guide of the light guide 15 is not adversely affected.

Figur 5 zeigt ein HausgerƤt in Form eines Ofens 40. Der Ofen umfasst eine ƤuƟere GehƤusewand 41 und eine innen gelegene Garraumwand 42, welche einen Garraum 43 umgrenzt. Der Garraum 43 ist Ć¼ber eine OfentĆ¼r 44 zugƤnglich, welche aus einem OfentĆ¼rrahmen 45 sowie einem OfentĆ¼rglas 46 gebildet ist, wobei durch das OfentĆ¼rglas 46 Einsicht in den Garraum 43 genommen werden kann. Die Garraumwand 42 ist mit Schienen 47 versehen, die in unterschiedlichen Hƶhen angeordnet sind und GarguttrƤger 48 in Form von beispielsweise Backblechen tragen. Innerhalb von Ausschnitten 49 der Garraumwand sind erfindungsgemƤƟe HausgerƤteleuchten 10 montiert, deren KĆ¼hlkƶrper 11 Ć¼ber Ausnehmungen 50 der GehƤusewand 41 zur WƤrmeabgabe mit der AuƟenluft in Verbindung stehen. Dieser Ofen ist in Figur 6 nochmals in Ansicht von vorne auf die OfentĆ¼r 44 gezeigt. FIG. 5 shows a household appliance in the form of a furnace 40. The oven comprises an outer housing wall 41 and an inside cooking chamber wall 42 which defines a cooking chamber 43. The cooking chamber 43 is accessible via an oven door 44, which is formed from an oven door frame 45 and an oven door glass 46, whereby through the furnace door glass 46 insight into the cooking chamber 43 can be taken. The cooking chamber wall 42 is provided with rails 47 which are arranged at different heights and carry food support 48 in the form of, for example, baking trays. Within housings 49 of the cooking chamber, domestic appliance lamps 10 according to the invention are mounted, the cooling bodies 11 of which are connected via recesses 50 of the housing wall 41 for heat release with the outside air. This oven is in FIG. 6 shown again in front view of the oven door 44.

In Figur 7 ist der Ofen 40 geschnitten entlang der Schnittlinie B-B in Figur 6 dargestellt. Man sieht insofern in Aufsicht auf den GarguttrƤger 48, welcher auf den Schienen 47 aufsitzt. Deutlich zu sehen ist auch, dass die SeitenwƤnde zweischalig aufgebaut sind und zwischen der Garraumwand 42 und der GehƤusewand 41 ein Isoliermaterial 51 angeordnet ist. Innerhalb einer Aussparung im Isoliermaterial 51 ist die erfindungsgemƤƟe HausgerƤteleuchte 10 angeordnet, deren KĆ¼hlkƶrper 11 in Richtung GehƤusewand 41 und deren Abdeckelement 21 in Richtung Garraum 43 gerichtet ist. Die GarraumrĆ¼ckwand 52, welche gegenĆ¼ber der OfentĆ¼r 44 den Garraum nach hinten begrenzt, ist im vorliegenden AusfĆ¼hrungsbeispiel einschalig, ein zweischaliger Aufbau kommt jedoch ebenso in Frage.In FIG. 7 the furnace 40 is cut along the section line BB in FIG FIG. 6 shown. In this respect, one sees in plan view the food support 48, which is seated on the rails 47. It is also clear that the Side walls are constructed bivalve and between the cooking chamber wall 42 and the housing wall 41, an insulating material 51 is arranged. Within a recess in the insulating material 51, the domestic appliance lamp 10 according to the invention is arranged, the heat sink 11 is directed towards the housing wall 41 and the cover 21 in the direction of cooking chamber 43. The cooking chamber rear wall 52, which delimits the cooking chamber towards the rear with respect to the oven door 44, is single-shelled in the present exemplary embodiment, but a two-shell structure is also suitable.

Figur 8 ist eine AusschnittsvergrĆ¶ĆŸerung gemƤƟ Ausschnittskreis VII in Figur 7. FIG. 8 is an enlarged detail according to section circle VII in FIG. 7 ,

Diese AusschnittsvergrĆ¶ĆŸerung zeigt die in Garraumwand 42 angeordnete Leuchte im Detail. Die erste ReflektionsflƤche 25 wie auch die LichtaustrittsflƤche 17 weisen in Richtung GarraumrĆ¼ckwand 52 und werfen das von der LED13 emittierte Licht derart in den Garraum 43 hinein, dass der Ć¼berwiegende Anteil der emittierten Strahlung von der OfentĆ¼r 44 weggerichtet ist. Auf diese Weise wird mit durch Nutzung des Direktlichtes D wie auch des Streulichtes S und der in Richtung GarrĆ¼ckwand 52 gerichteten Abstrahlcharakteristik der HausgerƤteleuchten 10 eine Blendwirkung des durch das OfentĆ¼rglas 46 den Garvorgang beobachtenden Benutzers bei optimaler Ausnutzung des emittierten Lichtes zur Erleuchtung des Garraumes 43 vermieden.This detail enlargement shows the lamp arranged in cooking chamber wall 42 in detail. The first reflection surface 25 as well as the light exit surface 17 point in the direction of the cooking chamber rear wall 52 and throw the light emitted by the LED 13 into the cooking chamber 43 such that the predominant portion of the emitted radiation is directed away from the oven door 44. In this way, by using the direct light D as well as the scattered light S and directed toward cooking back wall 52 Abstrahlcharakteristik the home appliance lights 10 a dazzling effect of the oven door glass 46 observing the cooking process user with optimal utilization of the emitted light to illuminate the oven 43 avoided.

Zusammenfassend stellt die Erfindung eine HausgerƤteleuchte 10 vor, welche durch eine Kombination von Lichtleiter 15, einen mit asymmetrischen ReflektionsflƤchen 25 und 26 versehenen Reflektor 20 und schlieƟlich durch einen Versatz des Lichtleiters 15 zur Leuchtenmittelachse LM eine spezielle Abstrahlcharakteristik aufweist, die eine blendfreie Ausleuchtung eines HausgerƤteinnenraumes ermƶglicht. Zudem wird die Lichtausbeute durch einen die gewĆ¼nschte Abstrahlcharakteristik unterstĆ¼tzende Nutzung der Streustrahlung S des Lichtleiters 15 wesentlich verbessert. Der Lichtleiter 15 erlaubt die beabstandete Anordnung der LED 13 vom HausgerƤteinnenraum, insbesondere wenn sich um einen Garraum handelt. Der Reflektor 20 dient darĆ¼ber hinaus nicht nur zur Reflektion der Streulichtstrahlung S sondern auch zur Reflektion der aus einem Garraum austretenden WƤrmestrahlung. Auf diese Weise kann die HausgerƤteleuchte 10 kompakt gehalten sein, so dass sie sich auch fĆ¼r den Einbau in HausgerƤteseitenwƤnden eignet.In summary, the invention provides a home appliance lamp 10, which by a combination of light guide 15, a provided with asymmetric reflection surfaces 25 and 26 reflector 20 and finally by an offset of the light guide 15 to the lamp center axis LM has a special emission characteristic that allows glare-free illumination of a domestic appliance interior , In addition, the light output is by a desired Abstrahlcharakteristik supporting use of scattered radiation S of the light guide 15 significantly improved. The light guide 15 allows the spaced arrangement of the LED 13 from the domestic appliance interior, especially when it is a cooking chamber. In addition, the reflector 20 not only serves to reflect the scattered light radiation S but also to reflect the heat radiation emerging from a cooking chamber. In this way, the home appliance lamp 10 may be kept compact, so that it is also suitable for installation in home appliance side walls.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
HausgerƤteleuchteHausgerƤte light
1111
KĆ¼hlkƶrperheatsink
1212
Platinecircuit board
1313
LEDLED
1414
LeuchtengehƤuseluminaire housing
1515
Lichtleiteroptical fiber
1616
LichteintrittsflƤcheLight entry surface
1717
LichtaustrittsflƤcheLight-emitting surface
1818
Rastausnehmungrecess
1919
Rastfederdetent spring
2020
Reflektorreflector
2121
Abdeckelementcover
2222
Glasscheibepane
2323
Anschlussleiterconnecting conductors
2424
SteckverbinderConnectors
2525
erste ReflektionsflƤchefirst reflection surface
2626
zweite ReflektionsflƤchesecond reflection surface
2727
ReflektorseitenwandReflector sidewall
2828
Scheitelachseapex axis
2929
Reflektorraumreflector
3030
Befestigungsarmemounting arms
3131
LichtleiternutenLichtleiternuten
4040
Ofenoven
4141
ƤuƟere GehƤusewandouter housing wall
4242
Garraumwandcooking chamber
4343
Garraumoven
4444
OfentĆ¼roven door
4545
OfentĆ¼rrahmenOven door frames
4646
OfentĆ¼rglasOven door glass
4747
Schienerail
4848
GarguttrƤgerfood support
4949
Ausschnittneckline
5050
Ausnehmungrecess
5151
Isoliermaterialinsulating material
5252
GarraumrĆ¼ckwandcooking space
KK
Kegelachsecone axis
RR
Rastelementlocking element
SS
Streulichtscattered light
DD
Direktlichtdirect light
LMLM
LeuchtenmittelachseLights central axis
LALA
LƤngsachse von 15Longitudinal axis of 15

Claims (10)

  1. Domestic appliance lamp (10) for cooking appliances such as ovens, microwave ovens or steam cookers,
    - having an LED (13) as a light source,
    - having a lamp housing (14) provided for mounting on an appliance wall,
    - having a light exit opening (17) in the lamp housing (14) which is closed by a transparent cover (21),
    - having a spacer element which is disposed between the LED (13) and the light exit opening (17) and sits in front of the light exit plane of the LED (13),
    - having a reflection means which directs the light emitted by the LED (13) to the cover (21),
    characterised in that
    - the spacer element is a light conductor (15) made from a single material which receives and bundles the light,
    - the entire light exit surface (17) of the light conductor (15) is provided with a uniform inclination relative to a central axis (LA) of the light conductor (15) and the cone axis (K) of the light cone exiting the light exit surface (17) is therefore likewise inclined relative to the central axis (LA) of the light conductor (15),
    - the reflection means is a reflector (20) which spans a reflector chamber (29),
    - the light conductor (15) is run into the reflector chamber (29),
    - the reflector (20) substantially deflects the scatter radiation (S) exiting the light conductor (15) in the direction of the cover (21).
  2. Domestic appliance lamp as claimed in claim 1, characterised in that the reflector (20) deflects the light very predominantly in the direction of the cone axis (K) of the light cone exiting the light exit surface (17) of the light conductor (15).
  3. Domestic appliance lamp as claimed in one of the preceding claims, characterised in that the reflector (20) has two track-shaped reflection surfaces (25/26) originating from an apex axis (28), the apex axis (28) being disposed close to a light entry surface (16) of the light conductor (15) .
  4. Domestic appliance lamp as claimed in claim 3, characterised in that the first track-shaped reflection surface (25) is curved about an axis of curvature parallel with the apex axis (28).
  5. Domestic appliance lamp as claimed in claim 4, characterised in that the first curved reflection surface (25) is run to a region of the light conductor (15) close to the light entry surface.
  6. Domestic appliance lamp as claimed in claim 5, characterised in that the region close to the light entry surface lies below a plane in which the peripheral beams of the beam cone defined by the irradiation angle of the LED (13) hit the boundary surfaces of the light conductor wall.
  7. Domestic appliance lamp as claimed in claim 4, characterised in that the light conductor (15) is laterally offset from the apex axis (28) of the track-shaped reflection surfaces (25/26).
  8. Domestic appliance lamp as claimed in claims 7 and 1, characterised in that the inclined light exit surface (17) of the light conductor (15) slopes downwards in the direction of the lateral offset.
  9. Domestic appliance lamp as claimed in claims 8 and 4, characterised in that the second track-shaped reflection surface (26) is non-curved and runs to the transition region, close to the light entry surface, of the light exit surface (17) and light conductor wall surface, and the inclination of the second reflection surface (26) relative to the cone axis (K) of the light cone exiting the light exit surface (17) substantially renders the second reflection surface (26) ineffective.
  10. Domestic appliance lamp as claimed in one of the preceding claims, characterised in that the reflector (20) and the depth to which the light conductor (15) extends into the reflector chamber (29) are adapted to one another so that the reflector (20) reflects only the scatter radiation (S) exiting the light conductor (15) but not direct radiation (D) exiting the light exit surface (17).
EP17187080.1A 2016-09-02 2017-08-21 Household devices luminaire Active EP3290810B1 (en)

Applications Claiming Priority (2)

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DE202016104855.9U DE202016104855U1 (en) 2016-09-02 2016-09-02 Appliances Light
DE102016118041 2016-09-23

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EP3290810A1 (en) 2018-03-07
US10151495B2 (en) 2018-12-11

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