EP2551601B1 - Domestic appliance with a domestic appliance door and a lighting device - Google Patents

Description

• EP 1 995 522 B1 offenbart einen Ofen, innerhalb dessen Ofentür Beleuchtungsmittel zum Beleuchten einer durch die Ofentür verschließbaren Ofenmuffel vorhanden sind. Diese Beleuchtungsmittel weisen mehrere Lichtquellen auf, welche ihr Licht direkt fokussiert in Richtung der Ofenmuffel strahlen. Die Lichtquellen können in Reihe angeordnete, ihr Licht jeweils die Ofenmuffel richtende Leuchtdioden sein. Dazu ist gezeigt, die Leuchtdioden an einem linken und an einem rechten Bereich der Ofentür jeweils auf einem Blechträger zu befestigen, wobei eine Ausrichtung der Leuchtdioden mittels einer entsprechenden lokalen Ausrichtung des Blechträgers erreicht wird. Die Ofentür kann mittels natürlicher Ventilation gekühlt werden. Jedoch ist die Ofentür vergleichsweise aufwändig aufgebaut. Auch sind die Leuchtdioden gegenüber hohen Temperaturen, wie sie z.B. bei einem Pyrolysebetrieb auftreten, nur unzureichend geschützt.
• US 2009/0316385 A1 offenbart eine Ofenleuchte, welche eine LED-Baugruppe oder Baugruppen enthält, die optisch mit einem Lichtleiter gekoppelt sind. Die Ofenleuchte umfasst auch eine Halterung und ein Paar von elektrischen Leitungsdrähten, um die LED-Leuchte mit einer externen Spannungsquelle zu verbinden. Die LED-Baugruppe verfügt über eine LED, die auf einer Leiterplatte befestigt ist. Die Halterung an einer Tür des Backofens befestigbar, um die LED-Ofenleuchte neben einem Seitenfenster zu halten. Die Halterung weist einen Schlitz benachbart zu dem Fenster auf, um Licht von der LED durch den Lichtleiter und in den Ofenraum zu leiten. Eine Positionierung der Leuchte außerhalb des Backofens und neben dem Seitenfenster ermöglicht es, die LED innerhalb gewünschter Temperaturgrenzen zu betreiben.
• EP 2 336 644 A1 offenbart ein Beleuchtungssystem für einen Haushaltsofen, wobei der Ofen einen Rahmen aufweist, der eine Muffel mit einer Öffnung, die durch eine Tür geschlossen werden kann, definiert, wobei die Tür wenigstens eine erste und eine zweite Glasscheibe aufweist, zwischen denen eine Dichtung angeordnet ist, und wobei das System zumindest eine Lichtquelle aufweist, die der genannten Tür zugeordnet ist, wobei die Lichtquelle innerhalb der Dichtung untergebracht, wobei die Dichtung wenigstens teilweise transparent ist, um einen Lichtstrahl durchzulassen, der mittels der Lichtquelle erzeugt wurde und in Richtung der Muffel gerichtet ist, wenn diese von der Tür verschlossen ist.
• DE 10 2005 045 367 A1 zeigt eine Innenraumbeleuchtungsvorrichtung für ein Gargerät mit einer Beleuchtungseinheit zum Einstrahlen von Beleuchtungslicht in einen Innenraum des Gargeräts. Um eine Innenraumbeleuchtungsvorrichtung für ein Gargerät bereitzustellen, die besonders kostengünstig herstellbar ist und die zudem stromsparend mit einer ungefährlichen niedervoltigen Stromversorgung betrieben werden kann, wird vorgeschlagen, dass die Beleuchtungseinheit zumindest eine Leuchtdiode umfasst.
• DE 10 2007 015 237 A1 offenbart eine Hausgerätevorrichtung, insbesondere eine Gargerätevorrichtung, mit einer Türeinheit zum Verschließen eines Nutzraums und mit einer Leuchteinheit, die zu einer Befeuchtung des Nutzraums zumindest bei verschlossenem Nutzraum vorgesehen ist. Um einen kompakten Aufbau zu erreichen, wird vorgeschlagen, dass die Leuchteinheit zumindest eine Lichtquelleneinheit aufweist, die in der Türeinheit angeordnet ist.

Es ist die Aufgabe der vorliegenden Erfindung, die Nachteile des Standes der Technik zumindest teilweise zu überwinden und insbesondere eine mit mindestens einem Beleuchtungsmittel ausgerüstete, einfach aufgebaute Haushaltsgerätetür eines Haushaltsgeräts bereitzustellen, bei welcher das Beleuchtungsmittel vor hohen Temperaturen verbessert schützbar ist.The invention relates to a household appliance with a household appliance door for closing a feed opening of a receiving space of the household appliance, wherein the household appliance door has at least one cold area, which is intended to be arranged in a closed state of the household appliance door side of the feed opening, and the household appliance door with at least one lighting device Has at least one light source for illuminating the receiving space.

• EP 1 995 522 B1 discloses a furnace within which oven door lighting means are provided for illuminating a furnace muffle closable by the oven door. These illumination means have a plurality of light sources which direct their light focused in the direction of the oven muffle. The light sources can be arranged in series, their light in each case the Ofenmuffel directing light-emitting diodes. For this purpose, it is shown to attach the light-emitting diodes to a left and to a right region of the oven door in each case on a sheet metal carrier, wherein an alignment of the LEDs is achieved by means of a corresponding local orientation of the sheet metal carrier. The oven door can be cooled by means of natural ventilation. However, the oven door is comparatively complex. Also, the light emitting diodes are insufficiently protected against high temperatures, as they occur, for example, in a pyrolysis operation.
• US 2009/0316385 A1 discloses a furnace light containing an LED assembly or assemblies optically coupled to a light pipe. The oven light also includes a bracket and a pair of electrical wires to connect the LED lamp to an external power source. The LED assembly has an LED mounted on a printed circuit board. The bracket can be attached to a door of the oven to hold the LED oven light next to a side window. The fixture has a slot adjacent the window for directing light from the LED through the light pipe and into the oven cavity. Positioning the luminaire outside the oven and next to the side window allows the LED to be operated within desired temperature limits.
• EP 2 336 644 A1 discloses a lighting system for a household oven, the oven having a frame defining a muffle having an opening that can be closed by a door, the door having at least a first and a second glass pane between which a gasket is disposed, and wherein the system comprises at least one light source associated with said door, the light source being housed within the seal, the seal being at least partially transparent to transmit a beam of light generated by the light source and directed towards the muffle if it is closed by the door.
• DE 10 2005 045 367 A1 shows an interior lighting device for a cooking appliance with a lighting unit for irradiating illumination light in an interior of the cooking appliance. In order to provide an interior lighting device for a cooking appliance, which can be produced particularly inexpensively and which can also be operated to save energy with a non-hazardous low-voltage power supply, it is proposed that the lighting unit comprises at least one light-emitting diode.
• DE 10 2007 015 237 A1 discloses a home appliance device, in particular a cooking appliance device, with a door unit for closing a work space and with a lighting unit, which is provided for a humidification of the useful space, at least when the closed space is closed. In order to achieve a compact construction, it is proposed that the lighting unit has at least one light source unit which is arranged in the door unit.

It is the object of the present invention to overcome the disadvantages of the prior art at least partially, and in particular to provide a household appliance equipped with at least one lighting means, a simply constructed household appliance door, in which the lighting means can be protected against high temperatures protected.

This object is achieved according to the features of the independent claim. Preferred embodiments are in particular the dependent claims.

The object is achieved by a household appliance having a receiving space that can be loaded by a charging opening, wherein the charging opening can be closed by a household appliance door and the household appliance door has at least one cold area, which is arranged laterally of the charging opening in a closed state of the household appliance door, and at least one lighting device with at least a light source for illuminating the receiving space, wherein the at least one semiconductor light source is within the cold region, the cold region of a hot region covering the feed opening in a closed state of the household appliance door by means of a Separation is separated and the separation at least one Lichtdurchleitöffnung for passing through the light generated by the at least one light source and at least one light guide extends through a Lichtdurchleitöffnung.

By arranging the at least one light source in the cold area, it can be maintained at a low thermal level even at high temperatures in the receiving space. In particular, the light source is not exposed to direct heat radiation. Consequently, a particularly long life of the lighting device can be achieved, even if an associated household appliance is pyrolysefähig.
In general, the cold area can in particular be that cold area which is located on that side of the household appliance door on which it can be pivoted or has at least one door hinge. Such a cold area is comparatively large, so that a sufficient, non-compressed installation space is available for accommodating the at least one light source.
It is an embodiment that the cold area is a lower cold area. A lower cold area may in particular be understood to mean a cold area which is arranged below the feed opening in the closed state of the household appliance door. Such a cold area is available in particular for downwardly opening doors such as oven doors.
Alternatively, the cold area, in particular in the case of a laterally opening or laterally pivotable household appliance door, may be a cold side area (eg for refrigerators or microwave ovens) or, in particular, in the case of a household appliance door which opens upwards or pivots on the top side (eg in the case of a built-in appliance).

It is yet another embodiment that the at least one light source is arranged in a partial region of the lower cold region, which extends up to 100 mm from a lower door edge and / or up to 150 mm from lateral door profiles.

A semiconductor light source is particularly durable, structurally compact and can generate a high luminous flux.
Preferably, the at least one semiconductor light source comprises at least one light-emitting diode. If several LEDs are present, they can be lit in the same color or in different colors. A color can be monochrome (eg red, green, blue etc.) or multichrome (eg white). Several light emitting diodes can produce a mixed light; eg a white mixed light. The at least one light-emitting diode may contain at least one wavelength-converting phosphor (conversion LED). The phosphor may alternatively or additionally be arranged remotely from the light-emitting diode ("remote phosphor"). The at least one light-emitting diode can be in the form of at least one individually housed light-emitting diode or in the form of at least one LED chip. Several LED chips can be mounted on a common substrate ("submount"). The at least one light emitting diode may be equipped with at least one own and / or common optics for beam guidance, for example at least one Fresnel lens, collimator, and so on. Instead of or in addition to inorganic light-emitting diodes, for example based on InGaN or AllnGaP, it is generally also possible to use organic LEDs (OLEDs, for example polymer OLEDs). Alternatively, the at least one semiconductor light source may, for example, comprise at least one diode laser.
The household appliance door may have at least one electrical connection to the associated (remaining) household appliance for supplying power to the at least one light source. When using at least one light emitting diode, an associated driver may be present in the household appliance door, in particular in the cold area, or alternatively in the (remaining) domestic appliance.
It is also an embodiment that the household appliance door is zwangsbelüftbar. As a result, a temperature in the appliance door is further lowered, which is a

Extends the life of their components and improves user safety from high temperatures. It is a development that at least the cold area is zwangsventilüftbar. Thus, the waste heat generating light sources can be cooled particularly effectively.
It is also an embodiment that the at least one light source is thermally conductively connected to at least one heat sink. This improves heat dissipation and cooling of the light source and thus their life. The heatsink can simultaneously represent a holder for the light emitting diode for a compact design and easy installation. The heat sink or holder can be attached to a reflector for cost-effective production, for a reduction of mounting tolerances and for ease of installation and in particular be pre-assembled on this.

According to the present invention, the quay area is separated from a hot area covering the charging opening in a closed state of the household appliance door by partition, and the partition has at least one light transmission opening for passing light generated by the at least one light source. This facilitates light guidance between the cold area and the warm area. The partition may be at least partially permeable to air to allow a cooling air flow between panes of the appliance door.

Furthermore, the illumination device has at least one light guide, in which light at least one light source can be coupled in and which is arranged and arranged to radiate light coupled into it into the receiving space. By providing the at least one light guide can be achieved in a simple manner, a particularly uniform and large-angle illumination of the receiving space. Also, a light guide can be made thermally particularly insensitive, for example, in an embodiment of glass or glass ceramic. The glass is preferably borosilicate glass.
It is an embodiment that the light guide consists of a vitreous material (glass, glass ceramic or the like). Glassy material is highly temperature resistant and typically transparent. An optical property can be easily and precisely changed by adding fillers. So the light guide likes as a diffusely scattering Be configured light guide. In addition, vitreous material is relatively inexpensive, versatile moldable and its surface easily retreatable.

Alternatively, the optical fiber may be made of plastic, which further simplifies manufacture. The plastic is preferably a highly temperature-resistant plastic. The plastic is preferably made of polycarbonate (PC), acrylonitrile-butadiene-styrene (ABS) and / or polymethyl methacrylate (PMMA).

In particular, the light guide can be a light guide which can guide light within its material or body ("light guide body"). The light guide is in particular a body which can guide the light by means of total internal reflection (TIR body). The light guide is in particular a solid body.

It is still an embodiment that the at least one light guide is arranged between an inner pane and an adjacent pane (for example a front pane or an intermediate pane). This allows a particularly high illumination efficiency. In addition, a good thermal shielding of the windshield is possible in the presence of at least one washer, since then the at least one washer can be configured thick without affecting the lighting.

It is a further embodiment that the at least one light guide is integrated in a pane of the household appliance door. So parts can be saved and also a space can be reduced. In addition, an increased illumination efficiency compared to an arranged behind this disc light guide is made possible by avoiding surface reflections. In particular, this disk can be an intermediate disk for good heat shielding of the windshield, since the intermediate disk (s) can then also be made sufficiently thick. Alternatively, at least one optical waveguide can also be arranged between two intermediate disks, the intermediate disks then being made thinner, if appropriate, in order not to increase their installation space.

It is yet another embodiment that at least one light guide extends at least over a height of the feed opening. So the recording room can over its entire height be illuminated, us even if at least one rack level o.ä. is occupied. The light guide is preferably oriented vertically.

In principle, one, two or even more light guides can be provided. At least one optical waveguide can be set up and arranged for illuminating a plurality of (in particular all) insertion levels of the receiving space, in particular a vertical optical waveguide.

A light guide may be arranged in particular perpendicular or horizontal. A vertical arrangement allows illumination over the height of the receiving space, in particular over several insertion levels. A vertical light guide preferably runs parallel to a door profile of the household appliance door. In order to provide the greatest possible see-through range, at least one vertically arranged light guide can be arranged in particular in a region of a left edge (left-hand arranged light guide) and / or a right edge (right-hand arranged light guide) of a viewing window of the household appliance door.

In particular, may be provided for illuminating a shelf level two light guides. By using two light guides, shadowing in the receiving space can be reduced. A light guide arranged on the left-hand side and a light guide arranged on the right-hand side can in particular be designed and / or arranged mirror-symmetrically with respect to a door central axis in order to support a uniform illumination of the receiving space.

Alternatively, at least one light guide may be set up and arranged for illumination of only one insertion level in each case. For this purpose, the light guide can be arranged in particular horizontally to allow uniform illumination across the width of the receiving space. In order to provide as large a viewing area as possible, a horizontally arranged light guide can be arranged in particular in a region of an upper edge and / or a lower edge of a viewing window of the household appliance door.

It is also an embodiment that at least one light guide thermally shields an adjacent door profile at least in regions. The light guide can therefore in particular be arranged between the receiving space and the door profile. As a result, heating of the door profile can be reduced, which is advantageous in particular for door profiles made of plastic. Such a light guide may in particular be a vertical light guide, which may extend in particular over the height of the feed opening.

It is still a development that a thickness of at least one light guide is preferably between 5 mm and 30 mm. However, the thickness is not limited to this.

It is also a development that a cross-sectional profile of at least one light guide is curved at least in sections and in particular circular-cylindrical, circular segment-shaped or oval may be formed. For a broad light emission, a curved or a more curved region of a lateral surface of the light guide preferably faces the receiving space. However, the cross-sectional profile is not limited thereto, but may be e.g. also angular and / or free-form.

The light guide is preferably rectilinear, but may in principle also be curved.

It is furthermore an embodiment that the optical waveguide has at least one surface area at which a light exit is prevented or suppressed, and has at least one (in particular complementary) surface area which is provided for a light emission, wherein the at least one surface area provided for a light emission is directed essentially into the receiving space. As a result, a targeted illumination of the receiving space is facilitated in a compact manner.

It is a special embodiment that the at least one surface area preventing or suppressing light emission is masked, in particular opaque coated or roughened. For example, a light guide, where light leakage is to be prevented, light-absorbing or, preferably, for a high light output, be reflective coated. A roughening or other microstructuring can be effected for example by sandblasting or etching and makes the roughened surface area appear milky or diffuse. The roughening or other microstructuring causes a diffuse reflection or back reflection of the light into the light guide, often at an angle which causes an increased light emission from the light guide at the illuminated by the back reflection location of the light guide. Consequently, in particular, light is emitted more intensively from an uncoated or roughened (ie, smooth) region of the light guide.
It is an advantageous for a uniform over its length Lichtausstrahlung further development that the light guide is configured or prepared in a constant over its length circumferential angle α about its longitudinal axis L for a targeted light emission. However, the invention is not limited thereto, and the circumferential angle α may vary with the length of the optical fiber.
The circumferential angle α is preferably in a range between about 45 ° and about 270 °, so that in a development intensified light in the complementary circumferential angle range between about 315 ° and about 90 ° can emerge (on which the surface of the Light guide is especially smooth and uncoated). The light guide may also have spaced over its length areas which have, for example, a mutually equal circumferential angle α. The regions can be arranged angularly offset in a row or, for example, also about the longitudinal axis.

According to the present invention, at least one optical fiber extends through a light transmission opening. As a result, the light guide upstream elements can be accommodated in the cold area, where they are thermally protected.
It is a further embodiment that the light guide is preceded by an intermediate piece, in which light at least one light source can be coupled and which forwards the coupled-in light to the light guide. The intermediate piece allows an effective coupling of light from the at least one light source and consequently a high luminous efficacy. The intermediate piece is preferably housed in the cold area.

It is also an embodiment that the intermediate piece is or has an optical element. As a result, a particularly versatile beam guidance can be achieved, in particular for a high luminous efficacy.

It is also an embodiment that the intermediate piece is made of plastic and the optical fiber is made of glass. Thus, an inexpensive and versatile light coupling and light transmission is provided. The intermediate piece is preferably housed in the cold area, in particular in pyrolysis household appliances. The intermediate piece and the optical fiber may alternatively be used e.g. both are made of the same material, e.g. made of glass or plastic, in particular integrally formed. This simplifies a production.

It is a development that the light guide, the intermediate piece and the at least one associated light-emitting diode are arranged in series or collinear with each other, which allows a high photometric illumination efficiency.

It is yet another embodiment that at least one light guide is associated with a reflector to reflect incident light from this light guide in the receiving space. This increases a luminous efficacy.

The reflector may, for example, be specular or diffusely reflective.

The reflector may further be configured tubular with a hollow cylindrical profile, which has at least one light exit opening in its lateral surface. The reflector can then absorb the light guide in particular.

The hollow cylindrical profile may be circular cylindrical and / or angular.

The at least one light exit opening may comprise a light exit opening extending over the entire length of the lateral surface.

The at least one light exit opening can be directed in particular into the receiving space.

The reflector can in particular serve as a heat shield, in particular to thermally shield a door profile against the receiving space.
The reflector can also serve as a holder for at least one or another element of the lighting device.

The household appliance can fall in particular in the field of "white goods" and in particular serve to do household chores such as cooking, baking, washing, cleaning and so on. The household appliance may be a large household appliance (eg comprising a refrigerator, a freezer, a freezer, an electric oven, a washing machine, a dishwasher and a tumble dryer) or a household appliance (eg comprising a microwave oven).

Fig.1

zeigt als Explosionsdarstellung in einer Ansicht von schräg hinten eine Backofentür;

Fig.2

zeigt in einer Ansicht von schräg hinten die Backofentür bei abgenommener rückwärtiger Scheibe;

Fig.3

zeigt die Backofentür aus Fig.2 in einer Rückansicht;

Fig.4

zeigt einen Ausschnitt aus Fig.2 im Bereich einer Lichtquelle;

Fig.5

zeigt einen Ausschnitt aus Fig.3 im Bereich der Lichtquelle;

Fig.6

zeigt einen mit der Backofentür ausgerüsteten Backofen als Schnittdarstellung in Draufsicht mit einem zugehörigen Lichtabstrahlmuster;

Fig.7

zeigt in Schrägansicht einen weiteren möglichen Lichtleiter der Backofentür;

Fig.8

zeigt in Seitenansicht noch einen weiteren möglichen Lichtleiter der Backofentür und;

Fig.9

zeigt als Schnittdarstellung in Draufsicht einen möglichen Lichtleiter der Backofentür mit einem Reflektor.

Fig.1 zeigt als Explosionsdarstellung in einer Ansicht von schräg hinten einen Grundaufbau einer Haushaltsgerätetür in Form einer Backofentür 1. Die Backofentür 1 weist zwei seitlich angeordnete Türprofile 2 auf, welche durch einen rechteckigen Rahmen 3 miteinander verbunden sind. Der Rahmen 3 stellt eine seitliche Begrenzung eines Sichtfensters dar.
An den Türprofilen 2 ist frontseitig eine Frontscheibe 4 aufgesetzt. Dazu kann die Frontscheibe mehrere auf die Frontscheibe 4 aufgeklebte Halterungen 5 aufweisen, welche in die Türprofile 2 eingreifen können. Zwischen den Türprofilen 2 kann optional mindestens eine Zwischenscheibe eingesetzt sein, hier beispielhaft zwei Zwischenscheiben 6, 7. Eine Rückseite der Backofentür 1 kann durch eine Innenscheibe 8 abgedeckt sein, welche z.B. ebenfalls durch daran aufgeklebte Halterungen 5 an den Türprofilen 2 befestigbar ist. Die Backofentür 1 ist oberseitig über ihre ganze Breite durch einen Aufsatz 9 abgedeckt, welcher einen Türgriff 10 aufweist.The household appliance may in particular be a kitchen appliance. It is particularly preferred that the household appliance is a cooking appliance (eg comprising an oven and / or a steamer), in particular an oven whose receiving space can also be referred to as a furnace room or (in the case of an oven) as a baking oven. Particularly in the case of an oven, in particular an oven, pyrolysis can be carried out and, because of the comparatively large receiving space (oven space), effective lighting is required.
In the following figures, the invention will be described schematically with reference to exemplary embodiments. In this case, the same or equivalent elements may be provided with the same reference numerals for clarity.

Fig.1

shows an exploded view in a view obliquely from behind a oven door;

Fig.2

shows in a view obliquely behind the oven door with the rear disc removed;

Figure 3

shows the oven door Fig.2 in a rear view;

Figure 4

shows a section Fig.2 in the range of a light source;

Figure 5

shows a section Figure 3 in the area of the light source;

Figure 6

shows an oven equipped with the oven door as a sectional view in plan view with an associated Lichtabstrahlmuster;

Figure 7

shows an oblique view of another possible light guide of the oven door;

Figure 8

shows in side view yet another possible light guide the oven door and;

Figure 9

shows a sectional view in plan view of a possible light guide the oven door with a reflector.

Fig.1 shows an exploded view in a view obliquely from behind a basic structure of a household appliance door in the form of a oven door 1. The oven door 1 has two laterally arranged door profiles 2, which are interconnected by a rectangular frame 3. The frame 3 represents a lateral boundary of a viewing window.
On the door profiles 2 front windshield 4 is placed. For this purpose, the windshield may have a plurality of affixed to the windshield 4 mounts 5, which can engage in the door profiles 2. Optionally, at least one intermediate disk can be inserted between the door profiles 2, here by way of example two Intermediate disks 6, 7. A rear side of the oven door 1 can be covered by an inner pane 8, which can also be fastened to the door profiles 2 by means of holders 5 glued thereto, for example. The oven door 1 is covered on the upper side over its entire width by an attachment 9, which has a door handle 10.

The frame 3 delimits in a view from the front or rear at least about an area ("warm area" W) of the oven door 1, which a feed opening 11 of a closable from the oven door 1 receiving space or oven chamber 12 of a baking oven 13 (see more precisely Figure 6 ) directly covers. The intermediate discs 6, 7 are limited to heat insulation on this warm area W.

Below the warm area W there is a lower cold area K, which is provided to be arranged in a closed state of the oven door 1 laterally, here: below, the feed opening 11. The cold area K is zwangsbelüftbar by means of a blower (o.Fig.), So that it is flowed through by the flow of cooling air when the blower is switched on. The forced ventilation can be performed by means of a fan located in the oven door 1 (o.Fig.) Or arranged in a body of the oven 13 fan.

The cold area K is separated from the heat area W by means of a partition 14, which is formed on a lower edge of the frame 3 and extends over the entire width between the door profiles 2.

The outer sides of the door handle 10 and the door profiles 2 form on each side of an elongated guide 15 for sliding or rolling receiving a guide member (o.Fig.) To push the oven door 1 in a body of the oven 13 can.

Fig.2 shows in an oblique view a back of the oven door 1 with the rear disc removed in a higher accuracy. Figure 3 shows the oven door 1 with removed rear inner pane 8 in a rear view.

The oven door 1 also has a lighting device 16, by means of which the oven chamber 12 of the oven 13 can be illuminated (see more precisely Figure 6 ). The illumination device 16 has on the left side and on the right side in each case a light source Shape of a light emitting diode 17, to each of which a rod-shaped light guide 18 connects. The left-side part and the right-side part can in particular be designed to have the same effect in terms of shape analogously (eg mirror-symmetrically to a center line of the door).

The LEDs 17 are located in the cold area K, so that they are sufficiently thermally protected even at high temperatures in the furnace chamber 12. For the light-emitting diodes 17 are firstly not directly exposed to the heat radiation emerging from the oven chamber 12 and also ventilated by the forced ventilation of the cold room K. As a result, the LEDs 17 can withstand temperatures of 400 ° C to 500 ° C in the furnace chamber 12 in a pyrolysis operation without a significant reduction in their life.

The light emitting diodes 17 are each arranged on the left side or right side in a partial region of the lower cold region K, which extends up to 100 mm from a lower door edge 30 and up to 150 mm from a next door profile 2.

Like also partially enlarged in Figure 4 and Figure 5 (Section A) shown, the light-emitting diodes 17 are mounted on respective carriers 19, which in turn are glued to the windshield 4. The carriers 19 can also serve as heat sinks and for this purpose are preferably made of a good heat-conductive material, in particular with a thermal conductivity of more than 15 W / (m · K), for example aluminum. The serving as a heat sink support 19 can be flowed around by the cooling air flow flowing in the cold region K.

For improved heat dissipation, the supports 19 may have on their outside at least one cooling structure (o.Fig.), E.g. Cooling fins, cooling pins, cooling fins, etc. The cooling structure may be integrally connected to the support 19, or e.g. as a dedicated heat sink to be fixedly connected to the carrier 19, e.g. be screwed or clamped or glued to it.

Alternatively or additionally, heat dissipation from the light-emitting diodes 17 may be achieved by a thermally highly conductive connection to the door profiles 2, for example by means of a connection of the supports 19 with a respective door profile 2.

For a good thermal connection of the light-emitting diodes 17 with their respective carrier 19 serving as a heat sink, the light-emitting diodes may for example be clamped to the carrier 19 and / or be attached to the carrier via a thermal interface material (TIM).

The light emitting diodes 17 is arranged downstream of each one intermediate piece 20 and thus optically downstream. The intermediate piece 20 serves to couple light emitted by the associated light-emitting diode 17 and to decouple it in a targeted manner. The intermediate piece 20 for this purpose has a frustoconical basic shape and has a dome-like, for example, on a smaller lower cover surface facing the light-emitting diode 17. spherical cap-shaped recess (o.Fig.), Which overhangs the light emitting diode 17 at least substantially, and also laterally. The intermediate piece 20 thus also serves as an optical system or an optical element, here: for beam shaping.

Since the intermediate piece 20 is completely in the cold region K, it does not need to meet any special thermal requirements and may consist of a thermally less resistant material, e.g. made of transparent plastic. However, the intermediate piece 20 is not limited thereto and may be e.g. made of glass, glass ceramic, etc. The intermediate piece 20 is also supported on the carrier 19.

Facing away from the recess, upper flat top surface 21 of the intermediate piece 20, the light guide 18 connects flat. Both the intermediate piece 20 and the light guide 18 conduct light by total internal reflection (TIR), so are designed as a TIR body. Light entering at the spherical cap-shaped recess is irradiated into the light guide 18 through the upper cover surface 21 if the refractive indices of the light guide 18 and the intermediate piece 20 are sufficiently coincident, especially with a same material (e.g., glass). To improve a light transmission, at least one optical transition layer (o.Fig.) May be provided on the upper cover surface 21.

The light guides 18 are each arranged vertically in the oven door 1 and parallel to the door profiles 2. They extend from the intermediate piece 20 to an upper crosspiece 22 of the frame 3. The optical waveguide 18, the intermediate piece 20 and the light-emitting diode 17 of a respective side are arranged in series or collinear with one another, which allows a high photometric illumination efficiency. For this purpose, a length of the respective light guide 18 is less here than a height of the oven door 1. The length of the light guide 18 is the same here.

For the passage of the optical waveguide 18 through the partition 14, the separation has two Lichtdurchleitöffnungen 23, through which a respective optical fiber 18 extends so that light 17 produced by the light-emitting diodes in the optical fibers 18 can be passed through the partition 14.

Since the portion of the light guides 18 above the partition 14 is in the warm region W of the oven door 1, it is preferred that the light guide 18 be made of a thermally resistant material, which in particular in the receiving space of e.g. 400 ° C to 500 ° C without damage. This material is preferably glass or glass ceramic.

The light guide 18 and the intermediate piece 20 may be, e.g. for ease of assembly, be formed integrally, e.g. of glass. A light guide 18 then has, in particular, a section which corresponds to the intermediate piece 20 in shape and / or function, but is integrated in the light guide 18. Alternatively, for example, the intermediate piece may be made of plastic (e.g., polycarbonate, PMMA or epoxy resin) and the glass optical fiber 18 or the like. Also, the light guide 18 may be made of plastic.

The light guides 18 are arranged and arranged to radiate light coupled thereinto through the charging opening 11 into the furnace chamber 12. Figure 6 shows in plan view a possible, of the two light guides 18 in the furnace chamber 12 irradiated light Lichtabstrahlmusters M. The Lichtabstrahlmuster M can illuminate a respective insertion level almost completely, highly uniformly. The fact that the light guides 18 extend over the entire height of the frame 3 and thus a field of view of the oven door 1, all shelf levels can be illuminated in such a way, even if the oven chamber 12 with slide carriers o.ä. is occupied. The light guides 18 have the further advantage that they can serve as a thermal barrier and so the adjacent door profile 2 against heat from the furnace chamber 12th can shield. This can be advantageous in particular for door profiles 2 made of plastic.

The baking oven 13 has a muffle 27 which is open on one side by the feed opening 11 to form the oven space 12. The muffle 27 is separated from a housing 13 a of the oven 13 by a heat insulation 24. The oven door 1 is in its closed state shown laterally on a surrounding the feed opening surrounding flange 25 of the muffle 27.

The two light guides 18 are arranged so that they lie at least in sections in the warm area W of the oven door 1, which allows a broad-angle light irradiation into the oven chamber 12. For a high illumination efficiency and a good thermal shielding of the windscreen 4, the light guides 18 are here seconded between the inner pane 8 and the intermediate pane 7 adjacent thereto, e.g. because then the intermediate discs 6, 7 can be configured thick without affecting the lighting.

A thickness of the here circular cylindrical light guide 18 is preferably 5 mm to 30 mm, but is not limited thereto. A cross-sectional profile of the light guides 18 is here curved at least in sections and may be e.g. be circular cylindrical, circular segment or oval. For a broad light emission, a curved or a more strongly curved region of a lateral surface 26 of the light guide 18 preferably faces the furnace chamber 12.

For a targeted emission of the light from the light guides 18, in particular directly into the furnace chamber 12, these can be at least partially designed or prepared accordingly, in particular on its surface. For example, a light guide 18 may be masked where light leakage is to be prevented. Thus, the optical waveguide 18 may be light-absorbing or, for a high luminous efficacy, it may be reflective coated.

Alternatively or additionally, as in Figure 7 shown, a light guide 18 in a region 18 a, where a light leakage is to be prevented or suppressed, roughened or otherwise microstructured as appropriate. This microstructuring, in particular Roughening, causes a diffuse reflection of the light into the light guide 18, and often at an angle which causes increased light emission from the light guide 18 at the illuminated by the back reflection location of the light guide 18. As a result, light is increasingly emitted from a non-roughened (smooth) portion 18b of the light guide 18. *** " For example, a roughening can be effected by sandblasting or etching and makes the roughened surface area appear milky or diffuse. To reduce light losses, an upper, free top surface of the light guides is also configured rather opaque.

The optical waveguide 18 is preferably designed or prepared for a uniform light emission over its length in a circumferential angular range α that is constant over its length about its longitudinal axis L for a targeted emission of light. The circumferential angle range α is preferably between 45 ° and 270 °, so that in a development intensified light can emerge in the complementary circumferential angle range between 315 ° and 90 ° (on which the surface of the light guide 18 is in particular smooth and uncoated).

Figure 8 shows a light guide 18, on which an intermediate piece at an angle β bent adjacent. Thus, the lighting device 16 may extend substantially over the entire height of the oven door 1. The bending angle β is here between 90 ° and 180 °. Alternatively, the light guide may be angled at the bending angle β.

For a further increase in the photometric illumination efficiency, a reflector may be present on the light guides 18, which partially surrounds the light guide 18, in particular via its longitudinal section radiating into the furnace chamber 12 (in this case, the section protruding into the heat region W).

So shows Figure 9 a tubular or tubular reflector 28 with a circular sector-shaped configuration. The reflector 28 partially surrounds the light guide 18 (serving as a light emitting element) with respect to a circumferential direction. The reflector 28 surrounds the light guide 18 in a longitudinal section outside the cold room K or within the hot room W.

A light passage opening 29 forming in a lateral surface 28a of the reflector 28 has an opening angle γ with respect to a longitudinal axis L of the light guide 18 from here γ = 90 °. The light passage opening 29 points in the direction of the furnace chamber 12. The orientation and size of the opening 29 allow the furnace chamber 12 to be specifically illuminated.

The complementary circumferential angle (1-α) with here α = 270 ° of the light guide 18 corresponds to the opening angle γ of the light exit opening 29, wherein also the light exit preventing or suppressing surface area 18a of the light guide 18 is directed to the reflector 28. The amplified light-emitting region 18b of the light guide 18 is directed in an analogous manner to the light exit opening 29. Thus, a high proportion of the light emitted by the light guide 18 is emitted directly from the light exit opening 29.

The reflector 28 and the light guide are aligned parallel to each other in the longitudinal direction. Light radiated from the light guide 18 onto the reflector 28 can be reflected by the reflector 28 through the light passage opening 29 into the furnace chamber 12. Consequently, light emerging from the light guide 18 can be radiated directly into the furnace chamber 12 through the light passage opening 29 or indirectly via the reflector 28.

As a further advantage, in addition to the light guide 18, the reflector 28 can also serve as a heat shield, which thermally shields the door profile 2 against the furnace chamber. This can be advantageous in particular for door profiles 2 made of plastic.

The reflector 28 may be specular on its side facing the optical waveguide 18 or may be designed to be diffusely reflecting, for a uniform light emission.

The reflector 28 may serve as a support for the light guide 18 at the same time.

The reflector 28 may be in one or more parts. In a multi-part construction, different parts for different functions, e.g. be provided for reflecting, carrying, positioning, etc., which supports a standardization of components.

For lower temperatures, the reflector 28 may be, for example, a reflective coated plastic body. For higher temperatures, the reflector 28, for example, a reflective coated or a shiny polished metal body be. A reflective coating may comprise, for example, aluminum and / or chromium. For example, the reflector 28 may be an iron or steel sheet coated with high-gloss aluminum.

Of course, the present invention is not limited to the embodiment shown.

Thus, the optical fibers may also be curved or angled in their length, that is, not just straight.

In a development, the reflector can serve as a carrier for the light guide, the intermediate piece and the light-emitting diode (s). Thus, a prefabricated lighting unit can be manufactured and mounted in a particularly simple and possibly also standardized manner. Also, manufacturing tolerances can be reduced.

Also, only one light guide or may be more than two light guides may be provided.

Bezuaszeichenliste

1

oven door

2

door profile

3

frame

4

windscreen

5

bracket

6

washer

7

washer

8th

inner pane

9

essay

10

door handle

11

loading port

12

furnace

13

oven

13a

casing

14

separation

15

guide

16

lighting device

17

led

18

optical fiber

18a

roughened area

18b

smooth area

19

carrier

20

connecting piece

21

cover surface

22

crosspiece

23

Lichtdurchleitöffnungen

24

thermal insulation

25

flange

26

Lateral surface of the light guide

27

muffle

28

reflector

28a

Lateral surface of the reflector

29

Light transmission opening

30

door edge

A

neckline

K

cold area

L

longitudinal axis

M

Lichtabstrahlmuster

W

warm area

α

Circumferential angle

β

bending angle

γ

opening angle

Claims (13)

1. Domestic appliance (13) having a receiving space (12) that can be loaded through a loading opening (11), wherein the loading opening (11) can be closed by a domestic appliance door (1) and the domestic appliance door (1)

   - has at least one cold zone (K) which is arranged laterally to the loading opening (11) in a closed state of the domestic appliance door (1) to be arranged, and

   - at least one lighting device (16) with at least one light source (17) for illuminating the receiving space (12),

   characterised in that

   - the at least one semiconductor light source (17) is located within the cold zone (K),

   - the cold zone (K) is separated from a warm zone (W) covering the loading opening (11) in a closed state of the domestic appliance door (1) by means of a partition (14) and the partition (14) has at least one light passage opening (23) for the passage of light generated by means of the at least one light source (17) and

   - at least one light guide (18) extends through a light passage opening (23).
2. Domestic appliance (13) according to claim 1, characterised in that the cold zone (K) is a bottom cold zone.
3. Domestic appliance (13) according to claim 2, characterised in that the at least one light source (17) is arranged in a subregion of the bottom cold zone (K) which extends up to 100 mm from a lower door edge (30) and/or up to 150 mm from a lateral door profile (2).
4. Domestic appliance (13) according to one of the preceding claims, characterised in that the at least one light source (17) comprises at least one semiconductor light source.
5. Domestic appliance (13) according to one of the preceding claims, characterised in that the household appliance door (1) can be force-ventilated.
6. Domestic appliance (13) according to one of the preceding claims, characterised in that the at least one light source (17) is thermally conductively connected to at least one heat sink (19).
7. Domestic appliance (13) according to one of the preceding claims, characterised in that the illumination device (16) has at least one light guide (18), in which light from at least one light source (17) can be coupled in and which is arranged and configured to irradiate light coupled into it into the receiving space (12).
8. Domestic appliance (13) according to one of the preceding claims, characterised in that an intermediate piece (20) is connected upstream of the light guide (18), in which light from at least one light source (17) can be coupled in, said intermediate piece (20) forwarding the coupled-in light to the light guide (18) and being accommodated in the cold zone (K).
9. Domestic appliance (13) according to claim 8, characterised in that the intermediate piece (20) is an optical element.
10. Domestic appliance (13) according to one of claims 10 or 11, characterised in that the intermediate piece (20) consists of plastic and the light guide (18) consists of glass.
11. Domestic appliance (13) according to one of the preceding claims, characterised in that the domestic appliance door (1) is a cooking appliance door, in particular an oven door.
12. Domestic appliance (13) according to one of the preceding claims, characterised in that the domestic appliance is a pyrolysis-proof domestic appliance (13).
13. Domestic appliance (13) according to one of the preceding claims, characterised in that the at least one light guide (18) is arranged between an inner pane (8) and a pane (7) adjacent thereto.

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