Dishwasher having at least two luminous surface elements

Description

The invention relates to a dishwasher with a washing space surrounded by a washing tub in which the load of the items to be washed is preferably cleaned at an elevated temperature, in particular with the use of chemicals such as washing liquid with the addition of e.g. cleaning agents or rinse aids. preferably water. In general, conditions prevail in the washing space which differ, sometimes significantly, from the normal environment in terms of temperature, humidity, etc. During a washing operation of a dishwasher, when the loading opening of its wash tank is deliberately closed by a door, in the washing space. the washing is sprayed through one or more spray devices. The washing area is therefore humid in this case. Preferably, the wash space is provided with one or more loading units, such as e.g. dish baskets and / or cutlery drawers, which serve to receive the load of items to be cleaned.

[0002] In order to improve the lighting conditions, an electric lighting means is often provided in the wash area, but it firstly needs to be shielded from the wash area conditions, and it is also necessary to pass one or more electric wires through the space-delimiting wall for washing up. It is also a disadvantage that such lighting means are often disturbing, since they reduce the useful space of the washing space and only result in insufficient lighting of the washing space. In addition, the lighting means can often only be positioned so that they blind the user when he loads or unloads the washing space.

[0003] In the dishwasher of US 2010/0218793 A1, for example according to Figure 2, only two tiny openings are provided in the top wall of its washing container, into which a support with a point light source, e.g. a LED, is each inserted.

The object of the invention is to provide a dishwasher with improved illumination or illumination of its washing space.

This object is achieved according to the features of claim 1. In this case, at least one of the walls of the washing space, in particular its rear wall, has at least two openings or perforations, each covered by a light surface element and a stiffening rib separating the openings from each other. the luminous surface elements each have a total area that corresponds to at least 20%, in particular between 50% and 95% of the wall area.

[0006] With this embodiment, a large, i.e. an extensive illumination region, which, compared to the hitherto, point-shaped light source, which is additionally attached protruding from the side wall of the washing space, enables an improved, in particular non-glare, low shadow and uniform illumination of the washing space, but also additionally or independently of this is possible thanks to many different illumination effects, lighting designs or lighting configurations. At the same time, this disruption, in particular the reduction of a given volume of the washing space, is avoided as hitherto by the housing of a point light source projecting into the washing space, which is mounted on the side wall of the washing space.

In the context of the invention, the walls of the washing space also include in particular an inner wall of the door which, in its closed position, faces the washing space. According to the construction principle according to the invention, also this inner door wall can be formed wholly or partially as an illuminating surface element. Thus, the wash space is a treatment space of a dishwasher which is soaked by the wash liquid during the wash operation and into which the wash load to be cleaned can be placed in order to act upon it with the wash liquid. The washing area is surrounded by the walls of the washing container and an inner wall, i.e. the so-called inner door of the door, preferably substantially liquid-tight when the loading opening of the wash tank door is closed, in particular e.g. for carrying out a washing operation of a dishwasher.

[0008] One wall can be formed almost entirely as a lighting region in the proposed manner, but a stiffening rib is permanently present between the two lighting elements, which is preferably formed integrally with the wash tank or with the wall, and the respective wall area or wash tank is stiffened. a kind of lattice structure, so that possibly the impact on the stability of the wash tank can be reduced, which can be exerted by, for example, plate-shaped luminous surface elements. Moreover, even if the wall is substantially replaced by luminous surface elements in a structurally simple manner and without restricting the available space in the wash space, its illumination is ensured. By means of the large illumination region mentioned above, when it is provided particularly preferably on the rear wall, it is possible to sufficiently illuminate, above all, the rear area of ​​the wash space facing away from the front side of the door, which has hitherto been largely unlit. This improves the ergonomics and comfort of the user of the household appliance.

[0009] The stiffening rib surrounded by the lighting elements also has the advantage of providing a mounting surface for the functional elements provided inside the washing spaces in addition to a stabilizing effect. Thus, a stiffening rib extending vertically on the rear wall can, for example, serve to fasten one or more water supply lines to a spray device arranged on the top wall, in particular to an overhead shower provided there, or a pivotally mounted spray arm and / or to the device. an optional spray arm mounted on the rear wall, in particular a spray arm which is optionally attached there. The side of the stiffening rib facing away from the wash space can also be used for mounting structural elements, for example also supply lines to the spray arm or hoses.

In other words, in general, the dishwasher according to the invention has a wash space that is acted upon during the washing operation by a liquid, which is limited by the plurality of wash tank walls and by the inner door wall. At least two openings in at least one of the walls, in particular in the rear wall of the washing container, are in each case covered or closed with at least one illumination element, which has at least one luminous surface element and at least one transparent, translucent element associated therewith. or reflective surface element.

The luminous surface element can basically be designed such that, in addition to its lighting function, it also has additional functions, for example increasing the stiffness and mechanical strength of the respective wall, it is resistant to the conditions of the wash area during cleaning or wash operations or has reflective properties in order to be able to use as much as possible all the light incorporated in or generated by the lighting element to illuminate the wash area. Such multifunctionality can often be implemented in various ways using unusual and therefore expensive special solutions on the market. According to the invention, a method of operating the above-mentioned type is adopted here by means of at least one separate, transparent, translucent or reflective surface element, i.e. separating these functions of the luminous surface elements. In this way, a suitable luminous surface element can be selected only with regard to its optical properties, without having to consider functions such as stiffening the wall having the luminous surface element. For example, the wall can be stiffened by a front panel positioned on the side of the illuminating surface element facing the washing container, as will be explained further below.

In particular, it may be expedient to generalize to the above particular structure if the respective wall has more than two openings which are covered or closed in each case by the illuminating surface element. Between each two adjacent openings, a wall stiffening rib is provided therein. It can be advantageous, for example, if, looking towards the width of the wall, a series of at least two openings are provided with illumination elements belonging to them and covering or closing them and / or if, looking towards the wall height, a series of at least two is provided. openings with the associated, covering or closing illumination elements. This is made possible by a wall illumination field that consists of a plurality of openings with these covering or enclosing light elements. Due to the remaining stiffening ribs, the wall is sufficiently stable and stiffened between each two openings. Thus, for example, the wall illumination field can be formed in such a way that in the direction of the wall width, next to each other, there are provided two rows of three consecutive openings which are each covered or closed by a light element, i.e. the wall has six openings in total, each with an associated light element.

[0013] Many different design possibilities exist for the fixing of the light surface elements to the wall and for the formation thereof. It is advantageously provided that the luminous surface elements are each fixed directly or indirectly on the edge of the wall delimiting the openings and forming the mounting flange. This can be done by a method which is simple in terms of production technology, so that wall openings are produced in the punching process in the washing container which is first produced with closed walls. The remaining wall areas then form a stiffening rib and a fastening flange.

Due to the fact that the light surface element overlaps the edge or the mounting flange, a mechanically correct and / or tight connection between the light surface element can be realized in a simple manner in an opening of the respective wall or in a gap between adjacent walls. It is particularly advantageous that the mounting of the illuminating surface elements can take place from the outside of the washing tub, so that the fastening means and / or the sealing means remain invisible and not in the way. In particular, it is generally avoided that the chemicals in the washing compartment, such as e.g. cleaning lye, are directly available, which could otherwise lead to damage to the fixing and / or sealing means. As a result, the service life of the structure is ensured.

According to an advantageous development of the invention, the stiffness or the stability of the wall or the washing tub can be further increased in that the mounting flange extends in a plane that is offset from the plane of the wall or relative to the mounting flange surrounding the wall areas in the transverse direction of the wall, in particular in the direction of the wall. the normal direction of the wall. In other words, expediently, the peripheral area of ​​the wall containing the mounting flange is bent away from the wash space or into the wash space such that a step or an edge area is formed, such as an angular profile, the end leg of the mounting flange delimiting the opening and its other leg extending through it. substantially in the transverse direction of the wall. As a result, the wall areas and the stiffening rib are no longer ordinary flat sheet metal parts but are profiled, which increases their stability and torsional stiffness. This embodiment increases the stability of the wall areas in which the openings and the stiffening ribs are provided.

The said displacement of the mounting flange, in particular towards the wash space, additionally has the advantage that a recess or recess is formed in the wall areas surrounding the opening, in particular on the outside, which can receive the light surface element and possibly other elements. constructional elements, for example covering the aperture, i.e. plates and foils, e.g. for the protection of a luminous surface element.

[0017] The deliberately luminous surface elements replace, and therefore substitute, at least 50%, preferably at least 75%, preferably between 80% and 95% of the total area of ​​at least one wall that limits the washable space. As a result, it may largely or wholly form said bounding wall in the form of a vast, voluminous illuminating object which shines. It is brighter than the other walls of the space and for washing, which are not replaced by a luminous surface element. This enables many interesting lighting design options in particular. In addition or independently of this, compared to a point light source only, it is possible to properly, in particular uniformly, illuminate larger volume areas in the wash space than before.

[0018] According to the invention, the light surface element is formed by a plate or panel element. As a result, it can be manufactured as a structurally simple element, which is advantageous in the mass production of dishwashers. Moreover, it allows for easy assembly with other wall parts to the washing container. Thus, for example, a washing tank having a front substantially rectangular loading opening or a loading opening for a dishwasher can be assembled in a manner simple in terms of assembly technology, with two side wall parts, a top wall part, a bottom wall part and a light surface element as wall part. rear. Moreover, the geometric shape of the luminous surface element of the plate or panel enables it to be manufactured in a simple manner in terms of production technology from a glass material and / or a plastic material.

In particular, it may be expedient if the light surface element, at least on its surface of the inner wall facing the wash space, is to a large extent flat, in particular smooth. As a result, first, the adhesion of dirt particles to the luminous surface element is reduced or largely avoided as compared to the case without the flat, smooth surface of the luminous surface element, i.e. it remains substantially clean. Secondly, the luminous surface element can be easily cleaned if it gets dirty. This flat, in particular smooth design of the luminous surface element is advantageous in particular in dishwashers when at least one wall, e.g. the rear wall of a washing container, is replaced with a luminous surface element according to the invention. Dirt particles, such as food remnants, that are released from the load of items to be cleaned, e.g. the dishes and / or cutlery in the wash tank when sprayed with the wash liquid by the one or more spray devices, thus remain much less or hardly on the luminous surface element.

Moreover, it can be advantageous if at least one sealing means is provided on the dividing line between the light surface element and the mounting edge or flange delimiting the opening. As a result, a sufficient sealing of the washing space can be ensured.

[0021] According to an advantageous development of the invention, the luminous surface element is formed to conduct and / or emit light such that an essentially homogeneous backlight is provided. This enables, in particular, a largely unobstructed illumination and / or an attractive pattern of light in the wash space under many circumstances. For example the back wall of the washing container may be formed by a luminous surface element formed as a backlight. As a result, the cleaned load of the items to be washed can be illuminated from the rear, i.e. from the side facing away from the loading opening of the wash tank of its interior space, its degree of cleanliness becomes more apparent to the user, in particular, when he opens the front door of the dishwasher at the end of the washing program and looks into the interior space of the wash tank.

[0022] According to a further advantageous development of the invention, the luminous surface element is formed by conducting and / or emitting light such that one or more light beams of at least one light source arranged outside the washing space can be coupled in the luminous surface element in an illuminating surface element. at least one coupling point, one or more conjugated light beams in the luminous surface element are propagating, starting away from the respective point of engagement, with a propagation direction running parallel to the inner wall surface of the luminous surface element facing the wash space, and from one or more light beams thus propagating, in particular transversely to their propagation direction, with the inner surface of the luminous surface element facing the wash area, one or more light beams may be disconnected from one or more detachment points that differ in the wash space, but the luminous surface element viewed from the wash space is substantially opaque. As a result, the light can be diffused to a great extent in the wash space, so that blinding the user as he peers into the wash space is largely avoided. As the wash space does not shine inward when viewed from the outside of the luminous surface element, constructional elements and components of the household appliance, such as e.g. a light source, can be arranged there in a simple manner.

[0023] In order to illuminate the interior of the wash space with the illuminating surface element, the light source is deliberately formed and positioned such that the light beams emitted therefrom act on one or more locations of the outer wall surface of the illuminating surface element facing away from the space into the dishwasher. for washing and / or on at least one face of the illuminating surface element. As a result, it can be advantageous if the at least one optical transmitting element, in particular the at least one optical guide, is optically coupled at one end to the light source and at the other end to the illuminating surface element. As a result, the light source can be locally located at a location other than the corresponding actual coupling point in the household appliance. In this way, the light source can be placed in a dishwasher, for example, in a bottom assembly underneath the washing tank, and the light beams emitted therefrom are transported via at least one light guide to one or more coupling points on the outer wall or on the face of the illuminator. surface element.

[0024] It is particularly advantageous if the luminous surface element is formed over a large area, i.e. as a flat wide area light guide. It allows better, uniform illumination of the luminous surface element, since the light can be connected to a plurality of points of release that are evenly distributed over the inner wall surface of the luminous surface element.

[0025] Generally speaking, the illuminating surface element is preferably formed such that the light beams emitted therefrom can shine diffusely into the wash space. For this purpose, the luminous surface element expediently comprises extractors. Thus, for example, the material layer of the luminous surface element may be mixed with scattering and / or reflecting particles, in particular dye particles. In this way, at least the inner wall surface of the illuminating surface element facing the wash space can in particular be designed to be substantially opaque when viewed from the wash space, in particular giving a cloudy effect.

Optionally, it can be advantageous that at least the inner wall surface of the illuminating surface element facing the wash space is provided with at least one structural or particle layer, in particular with a paint layer which, especially when viewed from the wash space, is substantially substantially opaque, especially giving the effect of turbidity. As a result, the luminous surface element can advantageously be produced. It can have a lighting function and also the function of a conventional wash space wall which is opaque. Thus, a plastic plate, a glass plate or a composite plate made of these materials may already be sufficient, the surface of the inner wall facing the wash area being covered with at least one paint layer or another structural or particle layer.

Moreover, it may be advantageous if the light surface element is provided, at least on its inner wall surface, with at least one light-impermeable protective layer which is applied to the outside from above. As a result, it is largely resistant to the treatment media used in the wash area.

[0028] Moreover, it may possibly be advantageous when the light surface element is designed as electro- or photoluminescent. In order to excite an electroluminescent light surface element to be lit, it is preferably connected to a voltage source, which is in particular located outside the washing space, e.g. in a bottom assembly under the washing space. Moreover, a field of organic light emitting diodes, e.g. OLEDs, or inorganic light emitting diodes, e.g. LEDs, which are each arranged as surface reflectors, can also optionally be provided as the light-emitting light surface element. In the case of using a photoluminescent luminous surface element to satisfactorily illuminate the luminous surface element, it may be sufficient if the light, e.g. from a light source mounted in the front area of ​​the wash space loading opening, e.g. an LED, strikes the illuminating surface element. Alternatively, light from an external light source or ambient light that enters the washing space of the household appliance when opening the front door and strikes the photoluminescent surface of the illuminating surface element may already be sufficient.

[0029] By means of the illuminating surface element according to the invention, the inner space or the washing space of the washing container can be made brighter over a large area than with the hitherto spot illumination. This is particularly advantageous when the washing container is full of items to be washed, such as e.g. crockery and / or cutlery in one or more loading units such as dish baskets and / or cutlery drawers and therefore its interior space remains blocked from outside ambient light such as kitchen light when opening the front door.

In summary, the dishwasher has a wash area with two conductive and / or light emitting luminous surface elements which replace the wash area wall by at least 20%, in particular between 50% and 95%, and which are separated from each other by with a stiffening rib. The corresponding wall of the washing container is thus made like trusses, which on the one hand increases the stiffness and mechanical strength, and furthermore provides the possibility of using a stiffening rib for fastening functional elements. The dishwasher may be equipped with at least one light source located outside the wash space for coupling light to the illuminating surface elements. They have a dual function, since they are, firstly, structural elements, namely to form a wall delimiting the washing space or a partial area and, secondly, they emit light associated therewith into the washing space. The internal geometry of the washing space and its usable volume remain essentially unchanged in this case, no major structural adaptations are required to the washing space or to the washing tank of a conventional light source available there, for example movable receiving baskets for a load of wash items to be guided in the washing tank. Rather, the light source is outside the washing area, e.g. on the outer side of at least one wall partial area, respectively, replaced by luminous surface elements. In all the mentioned cases and embodiments, the luminous surface elements replacing the wall or a partial wall area emit at least a portion of the coupled light into the wash area and illuminate or illuminate it. The light source can in this case be arranged such that the light emitted by it acts on the outer side facing away from the wash area and / or on at least one face or side edge of the light transmitting wall or light transmitting subregion.

[0031] Often in dishwashers, the space around the wash tub is limited, so that great problems arise in terms of positioning one or more light sources in this area. These problems are preferably solved in the actual embodiment by an optical transmission element which preferably comprises at least one optical guide, for example glass fiber, which is optically coupled on the one hand to the light source and on the other hand to the illuminating surface element. The light source may then be placed in a sufficient space of the dishwasher, e.g. in the area under the wash tank. Due to their low space requirements, one or more transmission elements can in this case also be arranged in narrow slotted spaces, for example between the washing tub and the outer wall of the dishwasher.

[0032] The visual appearance of the wash area in its illuminated state can be easily changed or adapted to the respective design requirements by dyeing the luminous surface element. Such coloring can be brought about by the use of a colored material, for example colored glass or plastic. Another possibility is to provide the outer and / or inner side of the luminous surface elements with a light-transmitting paint layer, in particular a plastic film. Another variant of the colored design is the use of a luminescent, especially fluorescent material. In this case, the material contains luminescent substances which are preferably embedded in the material of the luminous surface element or finely dispersed or dissolved therein. The light which is coupled in such a luminous surface element by a light source located outside the wash space is in this case at least partially converted into luminescent light which is colored depending on the luminescent dye or dye mixture used.

[0033] A further advantageous embodiment provides that the luminous surface elements are formed in the form of optical fibers. The light coupled at one point is in this case guided further inside the luminous surface element and diffused throughout its entire volume or at least partially. Such an embodiment is particularly advantageous in combination with a luminescent material. Such materials, which are formed luminescently and simultaneously in the form of an optical fiber, are known as so-called light-gathering plastics (LISA plastics) and usually contain fluorescent dyes.

[0034] Not every guide and / or light-emitting material that is suitable as a luminous surface element is also resistant to the conditions of the wash space. In this case, remedial measures can be taken such that an internal, light-transmitting protective layer from the luminous surface elements towards the washing area is provided, for example in the form of a varnish or foil, which protects the luminous surface element primarily against moisture and aggressive chemical influences, as well as against high thermal stress.

[0035] In the dishwasher according to the invention, in addition to the illuminating surface element covering the respective opening or the respective wall perforation, one or more surface elements formed in the form of films, plates or discs are additionally provided and are arranged on at least one side. a luminous surface element and, like him, cover the opening and, for example, act as a color filter or as a screening of the luminous surface element against the chemical and physical conditions prevailing in the wash space. The light surface element and the one or more surface elements are positioned relative to each other such that they are each separated by an air gap with a gap width of more than 1 µm or are spaced apart in the transverse direction of the wall. With this embodiment, two effects are obtained. First, in the absence of flat contact with each other, the formation of so-called Newton rings is prevented. Newton rings are the result of interference between two overlapping, reflective, nearly parallel surfaces, producing light or dark zones on the colored rings. This would disturb the visual appearance of the lighting area formed by the luminous surface element and the overall lighting situation. Reliable suppression of this phenomenon occurs when the air gap has a gap width greater than 1 μm. Interferences of the mentioned type may occur only when the slit width is in the range of half the wavelength of visible light (max. Approx. 780 nm or 0.78 μm). Secondly, the air gap can contribute to the thermal insulation of the washing area. For this purpose, it is appropriate to choose a greater gap width than necessary in order to avoid Newton rings in order to increase the insulating effect of the air present in the air gap. In this case, due to the limited space available in the dishwasher and the prevention of air convection in the air gap, which would again reduce the insulation effect, boundaries were set. For this reason, according to the invention, the joint width is limited to a maximum of 2 cm.

[0036] Of course, there are many possibilities for fixing the light surface element and other surface elements to the wall of the wash tank. In the case of a preferred embodiment, the fixing of the luminous surface element on the mounting flange and / or the luminous surface element associated with the luminous element for covering the perforation is provided in this way, that the relative motion is adapted in a plane extending parallel to the mounting flange between the light surface element or the surface element and the mounting flange due to the different thermal expansion of the washing container wall made of, for example, steel and a plastic element of the above-mentioned type. Due to this embodiment of the fastening, it is possible to use materials for the luminous surface elements and the surface elements which differ greatly from the material of the wash tank with respect to their thermal expansion. The different thermal expansion of the mounting flange and the surface and / or lighting element supported thereon must not have at least a long-term weakening effect on the mounting.

[0037] In the case of a particularly advantageous embodiment, for fixing the said type, the luminous surface element or surface element is adhesively connected to the mounting flange 16 with an insert of flexible alignment layer 57, which accepts shear forces caused by the relative movement between the luminous surface element / element. surface and the mounting flange. In this case, the leveling layer has a double function, on the one hand it ensures the adhesive bond and on the other hand it equalizes the shear forces. The latter function is substantially fulfilled when a leveling layer is used which is made at least partially, preferably entirely, of a plastic material, in particular polyolefin foam. A suitable shear force compensation is ensured when the leveling layer has a thickness of 0.2 mm to 2 mm, in particular 0.4 mm to 1 mm.

[0038] As already explained above, the stiffening rib separating the two openings from each other serves, inter alia, for the mechanical stabilization of the washing container. A further improvement in this regard is achieved by a further advantageous embodiment of the dishwasher, in that a front panel is mounted on the mounting flange of a transparent or translucent material which covers the opening, its side facing away from the washing space a luminous surface element is positioned, possibly with another element being arranged therebetween, for example a surface element. This embodiment offers many advantages. First, the luminous surface element can be selected without taking into account possible mechanical properties, different thermal expansion compared to the mounting flange or wash tank, or incompatibility with the chemical and physical conditions that prevail in the wash space during use. When selecting the focus, only the optical properties of the light element can be taken into account in order to obtain the most uniform and effective illumination effect possible. In terms of chemical compatibility of the front panel, it is desirable that the at least one surface layer of the front panel facing the washing space is made of a material that is resistant to the chemicals used in the washing space during the operation of the dishwasher.

[0039] A further advantage of the front panel is, in particular, that, in addition to the stiffening rib mentioned at the outset, an increase in mechanical stability is provided, in particular against deformation of the washing container, in that it is made of a suitably stable and torsion-resistant material, for example polyamide or polyacrylate.

[0040] The above-explained fastening of the luminous surface element or other surface element, which accepts the shear forces , is developed in a particularly advantageous manner such that the luminous surface element or surface element connected to the mounting flange, for example the front panel described above, forms a support for to which the illuminated surface element or surface element is attached, without connecting it to the wall of the washing container. An element connected as if by an alignment layer to a fastening flange, for example a front panel, in a way supports all the other elements one on top of the other. Due to the lack of mechanical attachment to the wall of the washing container, various thermal expansions of the elements and walls of the washing container or the mounting flange are practically insignificant.

[0041] Such a possibility for securing one element on another consists in securing the luminous surface element or surface element to the bracket by means of a connecting element which is connected to the bracket with a form fit acting in the transverse direction of the wall. In the case of such fastening, it is not necessary to use screws, rivets or binders. It is only ensured that the connecting piece engages at the rear with the surface of the front panel facing the washing tub. In this case, it results, above all, in obtaining a simple assembly when the said form fit is produced by a snap-fit ​​connection with a connection direction extending in the transverse direction of the wall. The connecting element can in this case be conveniently equipped with all the required elements, and the structure obtained in this way is then glued with the above-mentioned alignment layer to the fastening flange. In particular, with regard to the pre-equipment of the connecting element, it is advantageous if there is also a connection between the light surface element and possibly other surface elements, also by means of a positive fit, in particular a snap-fit ​​connection, acting in the transverse direction of the wall.

[0042] The connecting element in a further advantageous embodiment of the dishwasher is preferably designed as a frame which surrounds the support, for example the above-mentioned front panel, and the light surface element, essentially like a picture frame. This design of the connecting element, in addition to the positive fit acting in the transverse direction of the wall, also fixes the element supported by it in a plane extending parallel to the fixing flange without the need for additional fixing elements.

[0043] In order to form a positive fit with the front panel in the transverse direction of the wall, the frame correctly has at least one rear gripping element which engages at the rear with the side of the front panel facing the wash tub.

[0044] In a further preferred embodiment of the dishwasher, a reflective foil reflecting light is provided on the rear side, i.e. on the outer side of the luminous surface element facing away from the wash space, which covers the opening in the wall of the wash tub from the outer wall, and / or thermal radiation. As a result, it is deliberately achieved that the illumination region provided by the illuminating surface element appears brighter due to reflection. The luminous efficiency of the luminous surface element is in this case increased, so that possibly the luminous surface elements can be used with a lower illuminance. In order to prevent the formation of Newtonian rings as described above, the respective elements are separated from each other by an air gap with a gap width of at least 1 µm in the dividing line between the luminous surface element or other surface element and the reflecting layer.

[0045] By means of the retroreflective film, it is achieved that the light leaving the shining surface element through its outer side facing away from the washing container is not lost, but is reflected. It has surprisingly been found that the luminous effect of the luminous surface element can be significantly improved when a light source is provided arranged such that the light emitted therefrom is coupled on the front side of the reflective foil. In this case, it is advantageous if a light source available in the illuminating surface element, for example an LED strip, is used for the forward light coupling. The light source is in this case positioned and positioned such that it serves simultaneously for front light coupling in the illuminating air element and in the retroreflective film.

[0046] In summary, the invention relates to a dishwasher with a wash space that is affected by a liquid in use and thus becomes wet, and which is limited by the plurality of wash tank walls and an interior wall door. Two or more openings in at least one wall, in particular in the rear wall of the washing container, are each covered or closed by at least one illumination element. The corresponding illumination element in this case comprises at least one illuminating surface element and at least an associated transparent, translucent or reflective surface element.

Preferably, at least one of the walls, in particular the rear wall of the washing container, has at least two openings, each covered by the illuminating surface element and assigned to the illuminating surface element, at least one separate, open-covering transparent, translucent or reflective surface element. . The respective luminous surface element and the respective surface element are correctly separated from one another by an air gap in the transverse direction of the wall, i.e. when viewed along a straight normal wall. The illumination element, in particular its illuminating surface element and / or its surface element, is preferably attached e.g. by means of an adhesive bonding and / or mechanical fixing, directly or indirectly, in particular at the edge of the wall forming a fixing flange delimiting the opening. The plurality of illumination elements, in particular a plurality of their luminous surface elements, possibly to which one or more surface elements are assigned, preferably replace in total preferably at least 50%, in particular at least 75%, preferably between 80% and 95% of the total area of ​​the respective wall . In particular, it is expedient to provide for the attachment of the illumination element, in particular its luminous surface element and / or the surface element associated with the luminous surface element, in particular its mounting flange, in such a way that the relative movement in a plane extending parallel to the mounting flange between the element is adapted. illumination, in particular, its luminous surface element or its surface element, caused by different thermal expansion.

[0048] The illumination element, in particular its luminous surface element and / or its surface element, is suitably bonded to the wall, in particular to its mounting flange, with an alignment layer, in particular a sealing layer, arranged therebetween. It may be particularly advantageous if a front panel covering an opening made of transparent or translucent material is fixed on the wall, especially on its fastening flange delimiting the respective opening, and a luminous surface element, in particular, is arranged on its side facing away from the washing space. away from the front panel by an air gap. It may be advantageous if a support element is provided which receives the luminous surface element and / or the corresponding surface element, in particular a frame externally surrounding the luminous surface element and / or the respective surface element. The support element with the illuminated surface element to be supported and the surface element in each case assigned thereto then form the illumination element. In order to ensure the correct illumination of the wall inside the wash area, it may be advantageous if a reflective foil is provided as a surface element on the side of the illuminating surface element facing away from the wash area, which covers the opening and reflects light and / or heat radiation. In this case, this reflective surface element is deliberately spaced from the illuminating surface element by a predetermined air gap. A light source is expediently provided, which is positioned such that the light it emits is coupled to the front side of the retroreflective film. Additionally or independently of this, the light source is deliberately positioned such that the light emitted therefrom is coupled at the front side of the illuminating surface element. The illumination element is preferably mounted on the outer side of the respective wall facing away from the wash area, covering its respective opening at the rear. As a result, the wash area, especially in terms of the space initially provided (considered without wall lighting), remains substantially unaffected by the components of the respective illumination element. Due to the layered arrangement of the chemically resistant washable front panel offset from it with a predetermined spacing of the luminous surface element and positioned offset from it with a predetermined spacing element of the reflecting surface (viewed from the inside out), the result is a layered structure of the illumination element, so that it can be present despite the limited space on the outer side of the relevant wall, in particular the back wall, fixed in such a way that it does not inadmissibly protrude beyond the predetermined dimensions of the dishwasher.

It can be particularly advantageous, for example, if, looking in the direction of the width of the wall, a series of at least two openings with illumination elements belonging to them and covering or closing them are provided and / or that, when viewed in the direction of the wall height, a series of at least two openings with illumination elements belonging to them, covering or closing them. Due to the remaining intermediate ribs of the respective wall to be illuminated between the individual openings, the respective wall to be illuminated overall remains sufficiently rigid or stable.

The preferred embodiments and developments of the invention explained above and / or recited in the dependent claims, apart from e.g. exemplary cases of unequivocal relationship or incompatible alternatives, may be used individually or in any combination with each other. In particular, the embodiments of the luminous surface elements, surface elements and their mounting on the wash tank are independent of the number in which they are present on the wall of the wash tank.

The invention and its preferred embodiments and developments as well as its advantages are explained in more detail with the aid of the drawings.

[0052] They show each time in a schematic schematic sketch:

<td>Fig. 1</td><td>a preferred embodiment of a dishwasher made according to the invention in perspective view,</td>

<td>Fig. 2</td><td>the washing tank of the dishwasher shown in Fig. 1 in perspective view from the rear side,</td>

<td>Fig. 3</td><td>a partial section of the washing container in Fig. 2, corresponding to the line III-III,</td>

<td>Fig. 4</td><td>a partial section of the washing container in Fig. 2, corresponding to line IV-IV,</td>

<td>Fig. 5</td><td>a corner area of ​​the washing container corresponding to section V of Fig. 3, in which light is coupled to the front via an optical fiber in the illuminating surface element,</td>

<td>Fig. 6</td><td>a view corresponding to Fig. 5 with modified light coupling in the luminous surface element,</td>

<td>Fig. 7</td><td>clipping VII of Fig. 4 which shows another type of light coupling in the luminous surface element,</td>

<td>Fig. 8</td><td>cross-section view of a luminous surface element,</td>

<td>Fig. 9</td><td>a view corresponding to Fig. 5, which shows another possibility of fixing the light surface element on the wall of the wash space,</td>

<td>Fig. 10</td><td>an exploded perspective view that shows another possibility of fixing the luminous surface element, being mounted on the wall of the wash area by means of a frame,</td>

<td>Fig. 11</td><td>a partial section of the frame corresponding to line XI-XI in Fig. 10, being positioned with the luminous surface element and with two</td>

serving surface elements on the rear wall of the wash tank for other purposes,

Fig. 12 a partial section corresponding to the line ΧΙΙ-ΧΙΙ in Fig. 10,

Fig. 13 excerpt XIII from Fig. 11 enlarged,

Fig. 14 is a partial perspective view of the reflective foil i

15 shows a schematic perspective view of a further preferred embodiment for an illuminated wall, in particular the rear wall of the washing tank of the dishwasher of Figure 1, namely when viewed from the outside, with the individual components of the wall illumination field additionally formed in an exploded view.

[0053] In Figures 1-15, corresponding parts are provided with the same reference characters. In this connection, only those components of the dishwasher that are necessary for the understanding of the invention are provided and explained with reference characters. It goes without saying that the dishwasher according to the invention may include other parts and components.

Fig. 1 shows schematically, in perspective, a dishwasher 1 with a washing receptacle 3 in which there is a washing space 5 delimited by a washing receptacle 3 and a door 11. Figure 2 shows a washing receptacle 3. in a perspective view when viewed from the rear. The dishwasher is often designed as a built-in appliance and then is enclosed in the built-in state to the outside by furniture walls, the outer casing being partially or completely omitted. Otherwise, it may expediently include a housing 13 formed of the outer walls 10 which surrounds the washing tub 3. In this embodiment, the washing container 3 has a front loading opening 6 closed by a front door 11 and a total of five walls 7, namely a top wall 7a, two side walls 7b, a bottom wall 7c and a rear wall 7d, at least one of these walls in particular, the rear wall 7d, to which reference is made below by way of example, is replaced by two luminous surface elements 8 at least for 20%. The luminous surface elements each cover one of the two openings 23 in the rear walls 7d (shown in dashed lines in Fig. 2), the openings being separated from each other by a stiffening rib 9. The luminous surface elements 8 preferably replace at least 50% in total, in particular at least 75%, preferably between 80% and 95% of the area of ​​at least one wall, in particular rear wall 7d. In the case of a 95% surface replacement, the stiffening rib 9 occupies at least one part of the remaining 5% area. Each luminous surface element 8 thus forms an extensive lighting unit or lighting module which in each case illuminates the replaced wall surface so that it is bright in relation to the other walls, e.g. 7a, 7b, 7c. For this purpose, it can in particular be formed as a backlight, preferably uniformly illuminating or as a diffusive light emitter. It is intentionally designed as a flat slab, flat panel or even foil so that it is well suited to replace a wall or part of a wall. In this case, it is preferably rectangular in shape (viewed from above).

As can be seen from Fig. 2, the two luminous surface elements 8 provided side by side in the width direction of the wall can extend almost over the entire height of the washing tub 3. The correspondingly remaining stiffening rib 9 also extends centrally between the two luminous surface elements, covering or closing the openings, either in the height or vertical direction. As already explained above, the stiffening rib increases the stability of the washing tub. However, it also serves as a mounting rib on which components can be mounted, for example fixed in the washing space 5 on the rear wall 7d and a vertically extending supply line 12 for supplying the washing liquid to the spray arms (Fig. 4). The outer side 4 of the stiffening rib 9 facing away from the wash space 5 can also be used for mounting structural elements, for example hoses or conduits (not shown), which also serve, for example, to supply a liquid for washing the spray arm. On the side wall 7b in Fig. 2 another situation is shown in which, additionally or independently of the above-explained vertical arrangement of the two openings 23 in the rear wall 7d with a vertical stiffening rib 9 therebetween, the stiffening rib 9 'and the openings 23' run horizontally in the recess of the washing tank 3 or horizontally . The stiffening rib can in this case be used to fasten guiding means on the inside thereof, in particular the slots leading to the receiving basket (not shown) that can be moved in a downward direction. Of course, it may possibly also be expedient to provide this horizontal arrangement of two openings with a stiffening rib running horizontally therebetween not in the side wall 7b but in the rear wall 7d of the washing container.

[0056] In order for the luminous surface element to shine or emit light, it is deliberately formed as a photoconductive or light guide optical fiber. For this purpose, light beams which are coupled in an illuminating surface element, e.g. from a light source located outside the washing container, e.g. 14 (see e.g. Figure 3, 4) or generated in the material of the luminous surface element by energetic stimulation, are decoupled at a plurality of disconnection points, especially transversely to their propagation direction, from the inner wall of the luminous surface element facing the inner space of the washing tank, to the inner space of the washing container. For light or photoconductive guidance, the light surface element 8 has a flat support plate of a photoconductive or light-guiding material, e.g. glass, transparent or translucent plastic, e.g. acrylic glass or a composite of both. It also includes extractors for decoupling the light from the light-guiding or photoconductive carrier plate. The light decoupling can be realized by diffuse in the photoconductive material of a flat support plate, reflective and / or diffuse structures, e.g. FP (see e.g. Figure 8), through directed fine surface structures on the surface of the light-guiding inner wall or photoconductive support plate facing the wash area and / or by a fine pattern applied, especially printed, to the surface of the light-guiding inner wall or photoconductive support plate facing for washing up areas, e.g. with paint particles. The heterogeneous or heterogeneous dispersion of the decoupled structures results in a substantially uniform illumination of the surface of the luminous surface element because the light beams are diffused from the photoconductive or light-guiding support plate into the wash space in all spatial directions.

In summary, the illuminating surface element is formed as an optical guide such that e.g. light is emitted e.g. from one or more point or rod-shaped light sources which is or is preferably located outside the wash space, being as evenly diffused as possible. on the surface of the luminous surface element in order to be able to provide a backlight, ie backlight. It is in particular referred to as an optical guide or optical guide. In this case, light, such as e.g. 38, may for example be energized on a front side, such as e.g. 39, of a light surface element such as e.g. 8 (see Figure 3). Alternatively or additionally, the light may be coupled in the light-guiding material of the light surface element 8 through a rear, i.e. facing away from the wash space 5, surface of the outer wall, e.g. 24, of a flat, plate-like luminous surface element (see Figure 4). The flat luminous surface element 8, formed as an optical fiber plate, is preferably made of glass or of a transparent or translucent plastic such as, for example, acrylic glass. It comprises, for example, extractors which decouple the light from the optical fiber into the washing area 5. The decoupling can be realized by diffusing and / or reflecting structures distributed in the optical fiber material, by targeted fine surface structures and / or by a delicate, especially printed pattern, e.g. in the form of an ink layer or other diffusing and / or reflecting layer. In order to increase the luminance of the luminous surface element, light from one or more light sources may be advantageously coupled at a plurality of points of the luminous surface element, e.g. at a plurality of front points, in particular at two, three or all four front surfaces of a substantially rectangular light plate. surface element. Additionally or independently of this, light may also be led on the rear surface of the outer wall of the illuminating surface element to a plurality of locations scattered on the surface of the outer wall to the light-guiding or photo-conducting material.

The light surface element 8 is preferably formed to conduct and / or emit light such that one or more light beams 38, 45 (see Figures 3, 7, 5) of a light source 14, 40 located outside the wash space 5 is coupled to the light surface element 8 at at least one coupling point 39, 24, one or more coupled light beams, e.g. LS1 '(see Figure 7), in the light surface element 8, starting at their respective coupling point 39, 24, may propagate in the propagation direction of the EFR (see Figure 7) extending parallel to the surface 29 of the inner wall facing the wash space 5 the illuminating surface element 8 and that one or more beams, e.g. LS1 'of the light spreading in this way, one or more beams LS1 - LSn of the light can be detached from the inner wall surface 29 of the illuminating surface element 8 which faces the washing space 5, in particular at right angles to their propagation direction EFR , to the wash area 5 at one or more disconnection points AK which differ from the respective coupling points 39, 24, however, the luminous surface element 8 is designed to be substantially cloudy when viewed from the wash space 5.

[0059] It can be particularly advantageous if the corresponding luminous surface element 8, viewed from the wash space side, is formed milky or otherwise luminous, diffusive.

[0060] In the case of the dishwasher 1, the other walls, e.g. 7a, 7b, 7c of the wash tank, on the other hand, are manufactured, as conventionally, of light-impermeable material, e.g. metal and / or opaque plastic.

[0061] Moreover, other structures are also used to form a flat light emitter or luminous surface element, e.g. those that are formed as shadowless chambers. The light sources are in this case in a flat tub which diffuses light and only diffuses it towards the open side, here towards the washing area 5. Moreover, it can be advantageous when specially shaped reflectors and diffusion lenses for LEDs are used as the light source for fluorescent lamps, so that, despite the shallow illumination depth, the light coming out of the light bath is substantially homogeneous.

[0062] If the light scattered from a flat plate optical fiber or light bath is optionally spatially structured, it may possibly be advantageous if it is evenly diffused through a diffuser so that it resembles a completely uniform, especially white, luminous surface. A simple solution is e.g. an opal diffusing plate between the light guide or a light bath and the surface 29 of the inner wall facing the washing space 5 of the luminous surface element 8. In particular, foils can also be used which homogenize the light more efficiently than is possible e.g. by means of opal light.

[0063] Due to the light coupling from the at least one light source 14, for example an incandescent lamp or a light emitting diode, in the light surface element 8, light is emitted substantially inside it and finally into the interior space of the washing tub 3.

[0064] The light surface element 8 is attached in its peripheral area 15 to, for example, the remaining adjacent sheet metal walls 7a-7c, many different possibilities for this purpose. The substantially illuminated surface element 8 is mounted on a mounting flange 16 which delimits an opening 23 in the wall 7 of the wash tank 3. The luminous surface element 8 is mounted on the mounting surface 17 of the mounting flange 16, and it is formed either by the inside or by the outside of the mounting flange 16. The clearance of the preferably rectangular opening 23, viewed in the height direction, is only slightly less than the distance between the bottom wall 7c and the top wall 7a, and viewed in the width direction, it is only slightly less than half the distance between the two side walls 7b. The fastening flange 16 may be formed by deforming 90 [deg.] Inward into a corresponding opening 23 in the rear wall 7c of the rear leading edge regions of the top wall 7a, the side walls 7d and the bottom wall 7c. The fastening flange 16 can, however, also be the rest of the wall 7, which stands after the opening 23 has been punched. The fastening of the extensive luminous surface element 8 to the mounting flange 16 can take place, for example, by means of an adhesive layer 21, and it also seals the dividing line 19 between the mounting surface 17 and the luminous surface element 8 so that no washing liquid can escape between. fastening flange 16 and the luminous surface element 8 outwards.

In Fig. 9, an additional or alternative fastening is shown, namely via a bolted connection between the outer peripheral area 15 of the plate, in particular a rectangular light surface 8, and the fastening flange 16. The screw connection is indicated in Fig. 9 by a dashed line 18. On the dividing line 19 between the illuminating element 8 and the mounting surface 17 is a seal 20, for example made of an elastomeric material.

Alternatively, the luminous surface element may be mounted on the inside, or, as shown in Fig. 7, preferably on the outer side of the wall, e.g. on the rear wall 7d of the wash space 5 or in the wash area 5, the light surface element 9 being dimensioned such that it overlaps the edge 25 of the wall 7d surrounding the opening 23 or the mounting flange 16, i.e. on the side facing away from the wash space 5. The fixing of the luminous surface element 8 to the fixing flange 16 can in turn take place in various ways, for example by means of a layer 28 of glue, it also constitutes the area 27 of an overlapping seal of the dividing line 26 between the edge 25 and the luminous surface element 8. Fixing it can moreover extend additionally or alternatively through a screw connection, indicated by a dashed line. Instead of the adhesive layer 28, a peripheral seal may also be provided, corresponding to the seal 20 of Fig. 9.

[0065] The corresponding illuminating surface element 8 may in particular be designed such that the light it emits into the wash space has a color different from that of the conjugated light of the light source 14. This is possible, for example, because the material of the luminous surface element 8 contains FP dyes or other scattering and / or reflecting particles. It is also possible, however, that additionally or alternatively provided, for example glued (Fig. 8) there is a paint layer 36 or other layer of particles, e.g. in the form of a tinted plastic film or the like, on the inside or on the inner wall surface 29 and / or on the outer side or on the outer wall surface 24 of the illuminating surface element 8, 9 Optionally, luminescent dyes can also be used as dyes. A further embodiment is that the wall-replacing light surface element 8 is formed as an optical guide, further possibilities for visual shaping, in particular together with the luminescent dye contained in the material of the light surface element 8.

[0066] To provide protection against the conditions of the wash space 5, e.g. to protect against cleaning chemicals, moisture or high temperature, the luminous surface element 8 on the inside, i.e. on the side facing the washing space 5, it can be provided with a protective layer 37 of light transmitting material from the inside of the layer of the luminous surface element 8, 9 towards the washing space 5, e.g. from the outside, especially from the washing space 5, it is substantially opaque, in particular cloudy.

[0067] The protective layer 37 is attached directly to the inner wall facing the wash space of the photoconductive support plate of the light surface element. If the paint layer 36 is present on the surface 29 of the inner wall facing the rinse space, the protective layer is applied thereto as an overlay as shown in Fig. 8. In the case of light coupling through the front side of the luminous surface element 8, the light radiation can be enhanced in the wash space 5 in that the luminous surface element 8 on the outer side, i.e. on the surface 24 of the outer wall facing away from the wash space 5, is provided. into a layer reflecting the light beams into the washing area 5.

The light coupling can essentially take place such that the light source 14 is positioned at a distance, i.e. leaving an insulation gap to the illuminating surface element 8. The light source 14 can then, in particular, be shaped such that the light cone 38 in it fully affects the surface 24 of the outer wall of the illuminating surface element 8. In particular, a plurality of light sources 14 can be provided locally offset from each other such that the light cones cover different areas of the outer wall surface 24 of the luminous surface element 8 or, as is the case in Fig. 4, for each luminous surface element in each case. 8 is associated with at least one light source. It is also possible to arrange the light source 14 such that the light cone 38 illuminates the front face 39 of the illuminating surface element 8 (Fig. 3). Optionally, one or more light sources for front light coupling may be provided on the plurality of front sides of the light surface element 8.

In particular, an optical transmission element 40 can be provided for the light coupling. It is for example formed of one or more light guides, for example glass fibers, and is coupled on the one hand to the light source 14 and, on the other hand, to the surface 24 of the outer wall. or the front side 39 of the luminous surface element 8. The optical coupling between the transmission element 40 and the illuminating surface element 8 may be optionally contactless, in particular with the connection between an optical or imaging unit. There is then a gap 44 or a free insulating gap between the light-emitting surface 43 of the transmitting element 40 and the illuminating surface element 8. A light cone 45 is formed on the light emitting surface 43 (see Fig. 5). Optionally, the optical coupling can also be direct, i.e. the light-emitting surface 43 of the transmission element 40 is mechanically connected to the illuminating surface element 8. In this type of optical coupling, an optical deflection element 46 or an imaging optical system can be connected to the light-emitting surface 43. In order to affect a larger surface area of ​​the illuminating surface element 8 with the light and / or to increase its luminance, it may be desirable to provide multiple light sources 14 and / or multiple transmission elements 40. In Fig. 3 a case is shown in which in one optically coupled light source 14 there are a plurality of transmission elements 40a, 40b, the light emitting surfaces 43 of which are positioned at different positions of the outer wall surface 24 of the illuminating surface element 8.

[0070] In Fig. 10, the rear wall 7d of the wash tub 3 is shown in detail. It is preferably integrally formed with, for example, deep drawn wash tub 3 (not shown in Fig. 10). In the rear wall 7d there are two window-shaped openings 23 which are substantially rectangular and extend over the entire height of the wash tub 3 or the rear wall 7d, in particular substantially vertical. The openings 23, preferably produced during die-cutting, are delimited by the edge of the rear wall 7d, which forms the mounting flange 16, in particular for fixing the light surface element 8. The openings 23 are separated from each other by the stiffening rib 9, which runs in the vertical direction like the openings 23. the wash tank 3. The reduced mechanical stability of the wash tank 3 due to the replacement of a large part of the rear wall 7d by an illumination region, in addition to the fact that the illumination region is provided by two openings 23 separated by a rib that stiffens or covers or closes them by luminous surface elements 8, is also increased by this, that the fastening flange 16 is displaced compared with the plane 47 extending from the web in the transverse direction 58 of the wall. As a result, the stiffening rib 9 has a "C" -shaped profile when viewed in cross-section, which substantially increases the resistance to warping and torsional stiffness in particular. The remaining wall areas delimiting the openings are formed either gradually in the form of angular profiles due to said offset, which further increases the mechanical stability of the rear wall. The offset of the fastening flange 16 can be produced in a simple manner such that the back wall 7d (or other wall of the washing container) is embossed from its inside or outside to form a recess 48, and then the area of ​​the recess 48 corresponding to the opening 23 is punched. Preferably, the fastening flange 16 is moved into the wash area 5, i.e. the recess 48 is pressed from the outer rear wall 7d towards the wash area. The luminous surface element 8 can in this case be mounted on the outer side of the mounting flange 16 facing away from the wash space 5, part of its thickness being received by the recess or basin 48, i.e. the luminous surface element 8 does not protrude or only partially protrudes. beyond the plane 47 extending from the stiffener rib. This is advantageous, for example, when the exterior of the washing container is small.

The luminous surface element 8 can in particular be shaped such that, in addition to its luminous function, it performs other functions, e.g. increases the stiffness and mechanical strength of the respective wall or is resistant to the conditions prevailing during the cleaning operation in the washing space. A disadvantage in this case is that such additional functions are often not present with commercially available luminous surface elements, so that special solutions are required. To avoid this, the requirements beyond the lighting function are fulfilled by at least one aperture-covering transparent, translucent or reflective surface element FE located on the side of the illuminating surface element 8. The corresponding surface element FE, however, is not connected over a large area to the illuminating surface element by, for example, lamination. Rather, the luminous surface element and the respective surface element FE are separated from one another by an air gap 49a, 49b. The width of the air gap 49a, 49b is greater than 1 µm. This prevents disturbing light and dark spots, the so-called dark spots. Newtonian rings due to interference phenomena. In addition, the air gap 49a, 49b can also serve as thermal insulation. The air present in the air gap 49a, 49b can also act as an insulator. If the width of the air gap 49a, 49b is limited to a maximum of 2 cm, air convection which reduces the insulating effect of the air cushion in the air gap can be prevented.

[0072] In the embodiment shown in Fig. 11 to Fig. 14, each illuminating surface element 8 is associated with an FE surface element in the form of a front panel 50 on its side of the wash space and / or on its side facing away from the wash area, reflective an FE surface element in the form of a reflective foil 53, each leaving an air gap 49a, 49b. In this case, the width of the air gap 49a is 0.5 mm and the width of the air gap 49b is 0.1 mm. The front panel 50 is substantially 2 mm thick and is constructed of a plastic which is resistant to the chemicals used in operation in the wash area, e.g. PMMA or polyamide. The reflective foil 53 preferably has a multi-layer construction, as can be seen from Fig. 14. It comprises a base foil 52 of a transparent or translucent material, e.g. made of polyacrylate, the side facing away from the wash area 5 is provided with a reflective layer 54, the reflective properties of which result e.g. from a coating with white paint, e.g. TiO₂ or metallization. The light coupling to the illuminating surface element 8 takes place via its front side 84. In this case, the respective light source 14 is preferably an LED strip 55 located on the front side of the illuminating surface element 8, measured or positioned so that the light emitted by it is not only coupled. on the front in the illuminating surface element 8, but also on the front side 85 of the reflective foil 53, i.e. substantially in the base film 52. In contrast to the front light coupling only in the luminous surface element 8, in which the light emitted only through the side 61 of the luminous surface element 8 facing away from the washing space 5 is again reflected by the retroreflective film 53 towards the washing space 5, it has surprisingly turned out that that with the proposed embodiment, high luminous efficacy and very uniform illumination with high light intensity can be obtained. In this sense, it is advantageous if the front sides of the retroreflective film 53 not affected by the light from the light source are provided with a strip of retroreflective material, for example a retroreflective layer 54 of the type described above. As a result, it is ensured that practically all the light coupled through the front side of the retroreflective film 53 is available for illuminating the light surface element 8 or for illuminating the wash area 5.

[0073] In a further, preferred embodiment of the retroreflective film 53, the side facing the washing space 5 is provided with at least one diffusion layer 56, i.e. with a diffusing film or a disc. The above-described effect of uniform illumination of the washing space 5 is thus further enhanced.

[0074] In order to fasten the light surface element 8 and / or the PE surface member associated with the light surface member covering the opening, e.g. a front panel 50 on the mounting flange 16, various possibilities are considered. However, the mounting is preferred such that the movement between the luminous surface element 8 and / or the surface element and the mounting flange 16, due to different thermal expansion, extends parallel to the plane 62 extending from the mounting flange 16 is equalized. In the case of a particularly preferred embodiment, it is consequently ensured that the light surface element 8 and the FE surface element, in particular the aforementioned front panel 50, are adhesively bonded to the fastening flange 16, with an elastic alignment layer 57 therebetween that accepts the shear forces caused by by relative motion. In order to provide an adhesive bond, the alignment layer 57, which is preferably in the form of an O-ring, on its side facing the mounting flange 16 and on its side facing away from the mounting flange 16 may or be provided with an adhesive, for example with an acrylate adhesive. and thus be formed essentially in the pattern of a double-sided adhesive tape. The effect of absorbing the shear forces of leveling layer 57 is particularly well visible when it is at least partially, preferably entirely, made of a plastic foam, in particular a polyolefin foam, since the cellular spatial structure of the foam is particularly suitable for absorbing shear forces. In principle, however, a certain minimum thickness of the leveling layer of 0.2 mm to 0.4 mm is required. The maximum thickness of the leveling layer should in this case properly not exceed 2 mm, more preferably 1 mm.

As already described above, it is advantageous to associate to the illuminating surface element 8 at least one corresponding FE surface element covering the opening, here in particular to describe the already mentioned front panel 50, which is preferably attached on the side of the mounting flange 16 facing away from the opening. 5 washing areas. The front panel 50 can be made of a comparably stable material, so that it can contribute to the stabilization of the wall 7, which is at least partially replaced by the illuminated surface element 8. It is particularly advantageous if, additionally or alternatively for the front panel 50, all or at least for the surface layer facing the wash space 5, a material is selected which is resistant to the chemicals used in the wash space during the operation of the dishwasher. The very selection of the illuminating surface element 8 can then take place solely in terms of optical or lighting characteristics, without having to take into account the mechanical or chemical properties.

With respect to the problems explained above with regard to the relative movement between the mounting flange 16 and the illuminated surface element 8 and / or the FE surface element connected thereto, due to different thermal expansion, it is particularly advantageous if the said elements form a bracket T on which is fixed there is a luminous surface element 8 and / or an initially non-illuminating surface element FR, in this case, without having to be connected to the wall, e.g. 7d, or to the washing tank 3. Due to the lack of a mechanical connection to the wash tank 3, there are no problems with different thermal expansion at the connection point. Moreover, it is precisely in the case of washing tanks made of steel and the illuminating surface element 8 or another surface element FE made of a plastic material, i.e. the T-bracket, that there is a marked difference in terms of the thermal expansion of the materials mentioned, so that (without remedial measures) the resulting suitable combination presents the distinct problems of permanent weakness. If, on the other hand, a plastic element is attached to the T-bracket, due to similar materials, there are at most little differences in thermal expansion, which, however, is not a problem due to the lack of connection to the washing tank.

Mutual mounting of the illuminating surface element 8 and at least one separate surface element FE, in particular mounting of the illuminating surface element 8 and / or the FE surface element on the support T, e.g. the front panel 50 extends by a connecting piece V which is preferably connected to a bracket T with a form fit acting in a direction transverse 58 to the wall 7d. This type of connection is advantageous, in particular with regard to assembly technology, since it can, for example, be designed as a snap-fit ​​connection which only requires a simple linear connection movement for assembly. In addition, the form fit allows, in particular, in a manner which is simple in terms of assembly technology, to maintain a predetermined air gap 49a, 49b between the elements in question. Also, the attachment of the remaining elements, such as the illuminating surface element 8 or the FE surface element, e.g. the reflective foil 53, is preferably carried out by means of a positive fit acting in the transverse direction 58 of the wall, in particular by one or more snap-fit ​​connections. . In this case, the luminous surface elements 8 and / or the surface elements FE can be connected by means of a simple, linear coupling movement to the connecting element V, which is e.g.

The connecting element V is preferably a frame 59, which is surrounded on one side by a bracket T, i.e. for example a front panel 50, and on the other hand by further flat elements, preferably a light surface element 8 and / or one or more surface elements FE. and in this case supports said elements by means of a positive engagement acting in the transverse direction 58 of the wall. The frame 59 is connected at the rear by gripping elements 60 with the side 63 of the T-bracket or front panel 50 facing the wash space 5. The gripping elements 60 are flap portions of the wall that run parallel to the plane extending by the frame 59 or parallel to the plane 47 spanned through the stiffening rib 9. The thickness of the alignment layer 57 is chosen such that a free gap 64 remains between the mounting flange 16 and the T-bracket or front panel 50, the width of which, measured in the transverse direction 58 of the wall, is greater than the thickness 70 of the gripping members 60. In this way, it is ensured that the alignment layer 57, which is flexible in the transverse direction 58 of the wall, is somewhat compressible during assembly to ensure a sufficient adhesive bonding between the bracket T and the mounting flange 16 in the transverse direction 58 of the wall, without in this case touching. the frame 59 with the mounting flange 16 or interfering with the pressing of the alignment layer 57 against the mounting flange 16.

The frame 59 has a first recess 65 in which a T-bracket or front panel 50 is fully received. The recess is laterally bounded by a wall 66 which extends in the transverse direction 58 of the wall away from the gripping members 60. The free ends of the wall 66 face away from the wash space 5 are formed at least in sections as gripping members H which engage with the support T on its side 68 facing away from the wash space 5. The gripping elements H are preferably formed in the form of hook slats 67 arranged in the circumferential direction of the frame 59. They form snap-fit ​​elements which, due to the bevelled edge 71 facing away from the wash space 5, when inserting the bracket T into the frame 59 in the direction of the connection 72 are moved elastically outwards (arrow 69 in Fig. 13), and at the end of the joining movement they spring back by elastic forces restoring them to their original position, where they engage with the T-bracket. Possible relative movement between the T-bracket and the frame 59 parallel to the plane 62 spanned by the mounting flange 16 due to different expansion heat is possible due to the gap 64 between the wall 66 and at least one front side of the T-bracket.

[0080] The frame 59 has a further recess 73, which preferably serves to completely receive the light surface element 8. The side of the gripping members H facing away from the wash space 5 defines a support plane 74 against which the light surface element 8. The frame 59 is substantially formed by a wall 75 having a step 76, the surface of the step 76 facing away from the wash space 5 extends in a support plane 74. Therefore, in the mounted state, the illuminating surface element 8 rests on the gripping members H and on the step 76. The dimension of the gripping members H in the transverse direction 58 of the wall defines the width of the gap 49a between the illuminating air element 8 and the bracket T or the front panel 50. Fragment 77 wall 75 extending from step 76 towards wash space 5 surrounds wall 66 having gripping members H with lateral spacing 78. At the free end of the wall portion 77 facing the wash space 5, a support plane 74 is formed that extends parallel to the wall 81, from which wall 66 extends in the direction of the recess 73.

[0081] Grip elements H 'are formed at the free end directed away from the washing space 5 of the stepped wall 75, which engage at least indirectly on the side 79 of the illuminating surface element 8 facing away from the washing space 5. In the case of a direct rear handle, the gripping elements H ', which are preferably formed as hook bars 80 arranged in the circumferential direction of the frame 59, act directly on the side 61 of the light surface facing away from the washing space 5. In the embodiment shown in Figs. 11 to 13, an FE surface element, in particular the above-mentioned reflective foil 53, is provided leaving an air gap 49b. The air gap 49b is defined by a lateral spacer (not shown). The gripping elements H 'catch the reflective foil 53 from the rear and thus adhere to it. The hook bars 80 are formed on the side facing away from the wash space 5, also with a bevelled edge 71 to facilitate the insertion of a light surface 8, possibly provided with a reflective foil 53, in the connection direction 72. The gripping elements H 'or the hook slats 80 therefore function as or are formed as snap-fit ​​elements.

Associated with the illuminating surface element 8 is a light source 14 in the form of an LED strip 55, which is arranged in a recess 83 that opens into the washing space 5. The light source 14 or LED strip 55 is sized and positioned so that the light emitted therefrom engages both on the front side 84 of the illuminating surface element 8 facing it and on the front side 85 of the retroreflective film 53 facing it, as indicated on the Fig. 12 with the arrows 86.

Figure 15 shows a schematic perspective view of a further advantageous embodiment for an illuminated wall that restricts the wash space, in particular the rear wall of the wash tank of the dishwasher of Figure 1, namely when viewed from outside, additionally, for example, formed into individual components of a single wall lighting field in an exploded view. On the rear wall 7d, two vertical rows are provided side by side, in each of them three openings 23 arranged one above the other, i.e. there are 6 openings in total in the rear wall 7d. The corresponding opening 23 is formed rectangularly. Between the individual openings 23 there are preferably vertical and horizontal stiffening ribs of the preferably metal wall 7d, so that their stiffness is sufficient despite the openings. Each opening from the outside, i.e. on the side of wall 7d facing away from the washing space 5, it is provided with an illumination element IL. The illumination element IL has a cover plate or front panel 50, viewed from the inside of the washing space 5 outwards, which is resistant to the washing liquid, i.e. generally speaking, resistant to the chemicals used in each washing operation. It is glued on the rear side, i.e. on the outer side of the wall 7d via an adhesive frame mask 572. In this case, the adhesive mask is provided on the mounting flange 16 of the wall 7d extending around the opening 23. It is preferably formed in the shape of a recess and receives the front panel 50, in particular largely flat. The front panel 50 is thus fixed on the edge of the wall 7d surrounding the opening 23 via an adhesive mask 572. This is preferably made of a translucent, especially opaque plastic material, e.g. polyamide. The adhesive mask 572 simultaneously forms a liquid-tight seal between the front panel 50 and the peripheral zone 16 of the rear wall 7d around the opening 23. In addition, the alignment layer serves to absorb shear forces that may possibly occur due to the different thermal expansions of the rear wall 7d and the front panel 50. Such different thermal expansions may be caused by the use of different materials for the back wall 7d, e.g. steel, and for the front panel 50, e.g. plastic as they have different thermal expansion coefficients.

[0084] The illumination element IL has behind the front panel 50 (viewed from inside out) a light surface element or light panel 8. The light surface element 8 is supported at the front on a cover frame serving as a support element HE. The support element HE has a closed back wall RE which is formed as an element of the reflective surface. For example The back wall of the support element HE may be provided on its side facing the light panel 8 with a layer of white paint or with a white layer as a reflective background. The cover frame HE also receives a light strip, e.g. a LED strip or other elongated light source, in such a way that the light can be coupled therein along the longitudinal extension of the front side, in particular on the upper front side of the rectangular light panel 8 in this embodiment. The light panel 8 is correctly supported in the cover frame HE such that there is an air gap between it and the light-reflecting rear wall RE with a predetermined gap width, in order to prevent undesirable light phenomena such as Newtonian rings and to ensure to a large extent homogeneous, even illumination over the entire surface of the light panel 8. At each point of the light panel 8 it preferably shines with substantially the same light intensity.

[0085] In the embodiment of Figure 15, the curtain frame HE with the light panel 8 supported thereby is advantageously secured offset with a predetermined gap spacing by means of a mechanical fastening to the outer wall of the rear wall 7d as seen from the inside outwards. behind the front panel 50 that covers or seals the opening 23 with an adhesive mask 572. In order to mechanically fasten the side facing to the inside, i.e. to the wash area 5 of the rear wall 7d, a rectangular screen frame BR is preferably provided, which is attached here by means of a rectangular adhesive mask 571 on the side of the wash area at the edge. walls around the rectangular opening 23. The BR shutter frame has on its rear side a plurality of pins, bolts or bolts SI which are guided through respective drilled holes BO in the rear wall 7d, in the front panel 50, in the cover frame HE and possibly in the additionally accessible APR pressure frame and are held by via the SS securing screws on the outer side of the HE cover frame. The cover frame HE with the light panel 8 supported therein is thus fixed at a predetermined distance behind the front panel 50 by a mechanical fastening on the inner side of the rear wall 7d.

[0086] Optionally, the screen frame RB provided on the inside and the adhesive mask 571 provided for its attachment may be omitted in the wash space. Instead, pins, bolts or bolts SI, e.g. welded or otherwise attached, can be permanently mounted around the opening 23 on the outer side of the wall 7d in the edge region 16 of the rear wall. Mechanical fixing of components, e.g. 50, HE of the illumination element IL can then proceed in a suitable manner as described above by means of pressing.

Due to the combination of the adhesive bonding and the additional mechanical fixing of the illumination element IL on the lighting wall, e.g. 7d, its entire structure is largely liquid tight and essentially insensitive to substances from outside and inside. The mechanical fastening of the illumination element to the wall relieves the adhesive to be sealed between the front panel 50 and the supporting edge, in particular the fastening flange 16, which surrounds the respective opening 23.

[0088] In a modification of the two above-mentioned preferred constructions, the cover frame HE can in particular be made such that, at a predetermined distance from the light panel 8, i.e. in front of its side facing the washing area, it also receives and supports. solution resistant front panel 50. In this case, an adhesive joint 572 is provided between the outer rim facing the wash area of ​​the front panel 50 and the supporting rim 16, and the illumination element IL is additionally fixed on the outer side of the wall by means of a suitable mechanical fastening.

[0089] This overall illumination element IL structure, which in a preferred embodiment (viewed from inside out) comprises a frame with an HR cover, a front panel 50, at the rear with a predetermined slit spacing, the light panel 8 and behind it with a predetermined spacing The slotted element RE of the reflective surface, according to a preferred alternative, may possibly be attached only by means of an adhesive mask 572 on the rear attachment edge surrounding the opening 23, especially on the mounting flange 16 of the rear wall 7d of the wash tank. This variant therefore lacks any additional mechanical fastening.

In summary, it may be expedient if the wall in each case intended to be illuminated, which restricts the wash area which is wet during the dishwashing operation , has a plurality of illumination elements which cover or close the corresponding openings in the wall. The openings remain separated by the remaining ribs of the wall material, e.g. steel sheet. In total, an illumination structure is thus created which illuminates or illuminates a large part of the total area of ​​the wall and is nevertheless sufficiently stable for the practical operation of the dishwasher. In particular, therefore, the rear wall of the washing container can be illuminated over a large area, in particular between 50% and 95% of its total area.

LIST OF REFERENCE CHARACTERS

[0091]

<td> 1 3 4</td><td>dishwasher washing compartment outer side</td>

<td>5 6 7, 7a, 7b, 7c, 7d 8 9 10</td><td>washing area loading hole walls luminous surface element stiffening rib outer wall</td>

<td> 11 12</td><td>door power cord</td>

<td> 13 14</td><td>housing source of light</td>

peripheral area mounting flange mounting surface dividing line gasket adhesive layer dividing line opening outer side or surface of the outer wall edge dividing line overlapping area adhesive layer inner side or surface of the inner wall paint layer protective layer light cone front side transmission element dividing line light-emitting surface distance light cone an element that deflects the plane recess slot air front panel base foil reflective foil reflective layer LED strip diffusion layer leveling layer transverse direction of the wall frame rear grip side plane side slot fixing wall hook bar side arrow thickness oblique edge joining direction fixing bearing plane stepped wall step wall fragment distance hook bar wall fixing front side front side adhesive arrow mask disconnection points pressure frame drilled holes, openings diffuser frame illumination element paint particle grip element cover frame, supporting element disconnected light beams beam of light propagating in the material of the luminous surface element light strip reflective rear wall

SI

SS pins, pins securing bolts