WO2004097303A1

WO2004097303A1 - Cooking device

Info

Publication number: WO2004097303A1
Application number: PCT/EP2004/004326
Authority: WO
Inventors: Walter Gramlich; Bernhard Götz
Original assignee: BSH Bosch und Siemens Hausgeräte GmbH
Priority date: 2003-04-25
Filing date: 2004-04-23
Publication date: 2004-11-11
Also published as: DE10318861B4; GB2416202A; DE10318861A1; GB2416202B; GB0521369D0

Abstract

The known cooking devices consist of a cooking area (1), a door (9) for closing said cooking area and a lighting system (21, 39) for lighting the cooking area (1) which comprises at least one reflector (39) arranged in the internal space (37) of the door (9) and reflecting light emitted by a light source (21) of the lighting system in said cooking area (1). In order to prevent light losses, the inventive reflector (39) describes a transparent area (49) on the side of the internal door space for transmitting light in the cooking area direction.

Description

Cooking appliance

The invention relates to a cooking device with a cooking space and a cooking device door for closing the cooking space and a lighting device for illuminating the cooking space, which has at least one reflector which is arranged in a door interior of the cooking device door and reflects the light of the light source into the cooking space.

From DE-A-38 08 716 a device for illuminating the interior of household appliances is known. The lighting device is integrated in an oven door and has curved reflectors which are elongated and have a parabolic cross section and are arranged at the height of the viewing window. Several reflectors are preferably assigned to the reflectors. As a result, glare-free and extremely uniform internal illumination of the oven muffle or the cooking space is achieved in all loading levels without intervention in one of the muffle walls.

From DE-A-36 43 354 lighting device for an oven is known, in which a lamp is arranged within a cooking appliance door. In order to obtain optimal illumination of the baking space, the lamp is assigned a reflector that has sloping reflector surfaces, which ensures maximum illumination of the baking space by the light rays emanating from the lamps, without seeing the lamps themselves from the outside.

The object of the invention is to provide a cooking device in which light losses are avoided and the cooking space is illuminated in an optically appealing manner.

The object is achieved by a cooking appliance with the features of patent claim 1. According to the characteristic part, the reflector delimits a light-guiding space that is translucent to the cooking space on the inside of the door. As a result, the light guiding room is sufficiently opaque to the interior of the door. A luminous efficacy of the lighting device is thus increased in comparison to the prior art. The reflector can preferably be trough-shaped with raised side walls which are in contact with the partially transparent door inner pane. A light guiding space that is sufficiently closed with respect to the door interior can thereby be achieved. In this case, it is advantageous if the side walls of the reflector are in direct contact with the door inner pane or only slightly spaced therefrom. This reduces the number of light gaps between the reflector and the inside of the door through which light emerges into the inside of the door.

Such light gaps can in particular be completely sealed if a sealing element for sealing light gaps is arranged between the reflector and the inner door pane.

The light guiding space can advantageously be designed as a cavity. Compared to light guides made of a solid material such as glass, light losses are minimized.

For cleaning the reflector and / or the inner door pane, the inner door pane is detachably mounted on the cooking appliance door. In this case, it is advantageous if the reflector is detachably in contact with the inner door pane. This means that the inside of the door can be cleaned independently of the reflector.

It is preferred if the reflector has at least one first reflector surface, which reflects the light from the light source as a diffuse scattered light into the cooking space. In this case, the entire cooking space is illuminated evenly. Furthermore, the reflector can have at least one second reflector surface, which reflects the light from the light source bundled into the cooking space, specifically in the direction of the food to be cooked. In this way, a food item arranged in the cooking space is highlighted. The second transverse reflector surface is arranged transversely to the first reflector surface and aligned with the cooking space. In particular, the combination of diffuse scattered light and bundled light unfolds an optically advantageous lighting effect in the cooking space.

It is particularly preferred if the second transverse reflector surface reflects the light in the form of a light cone into the cooking space, which widens in the direction of the food to be cooked. This ensures extensive and intensive lighting of the food. Alternatively, it can be optically preferred if the beam path of the light reflected from the transverse reflector surface is directed almost parallel to the food to be cooked. In this case, the bundled light strikes a relatively small area of the baking sheet. To bundle the light from the light source, the transverse reflector surface can be flat or curved in the direction of radiation. In this case, the cross reflector surface is oriented towards the cooking chamber like a curved mirror.

It is advantageous if one of the transverse reflector surfaces serves to deflect the light from the light source in the direction of further transverse reflector surfaces. In this case, the light source can be arranged spatially separate from the reflector. It is sufficient if the light source is only in optical connection with the deflecting transverse reflector surface in order to deflect the light onto the further transverse reflector surfaces.

The first reflector surface can preferably be flat or convex in the direction of radiation. In this case, the first reflector surface achieves a particularly good light scattering effect, as a result of which all edge zones of the cooking space are adequately illuminated.

It is preferred in terms of production technology if the first and second reflector surfaces are formed in one piece with the reflector. In this case, the reflector can be made, for example, from a plastic injection-molded part, the reflector surface of which is mirrored. The various reflector surfaces are already aligned with one another during the manufacture of the reflector. It is particularly preferred if the reflector material has a low coefficient of thermal expansion, since warping of the reflector in the event of thermal stress is thus reduced. This ensures a permanently optimal alignment of the first and second reflector surfaces with respect to one another.

A particularly harmonious illumination of the cooking space results if a transition between the first and the second reflector surface in the reflector is rounded. This ensures a constant transition of the light intensity between the focused light and the diffuse scattered light. In this context, it is also advantageous if the surface structure of the second transverse reflector surface is roughened. The second The cross-reflector surface therefore not only produces bundled light, but also a small amount of diffuse scattered light. This also results in a constant transition of the light intensity between the concentrated light and the diffuse scattered light.

The light source of the lighting device can advantageously be arranged outside the cooking device door and radiate light onto the reflector arranged inside the cooking device door. An arrangement of the light source that is spatially separate from the reflector can thus be carried out. In this case, vibration-sensitive lamps can also be used, since the light source is not exposed to vibrations when opening and closing the cooking appliance door.

It is preferred if the first reflector surface of the reflector is curved in the shape of a groove. A U-shaped or parabolic groove shape of the first reflector surface is particularly advantageous here in order to obtain an optimal light distribution of the diffuse scattered light in the cooking space. In this case, the first reflector surface delimits the light guiding space. The light from the light source collects in the light guide room and is reflected from there into the cooking chamber. Loss of light when the light is reflected from the reflector is reduced. It is advantageous if the transverse reflector surface is arranged within the light guide space and reflects the bundled light into the cooking space.

It can be advantageous if the reflector has a light channel that is opaque to the outside. Through the light channel, the light can be transmitted between spaced reflector surfaces without loss of light. The loss-free light transport within the reflector increases the light output.

An exemplary embodiment of the invention is described below with reference to the attached figures. Show it:

Figure 1 is a perspective view of a cooking appliance with the cooking appliance door open;

Figure 2 is a side sectional view of a section of the cooking device; Figure 3 is a perspective view of the cooking appliance door with a partially broken door inner pane;

Figures 4a to 4c a reflector arranged in the cooking appliance door in a view from above and from the side and in a perspective view; and

Figure 5 is a front view of the cooking device without the cooking device door and in a partial section.

1 shows a cooking appliance with a cuboid cooking appliance muffle 3. The cooking device muffle 3 has a muffle opening 5 on the front. On the two

Side walls of the cooking device muffle 3, horizontal insertion ribs 7 are formed.

These are used to insert and support baking trays horizontally

Garraumebenen. The muffle opening 5 on the front can be closed via a front cooking appliance door 9. This is pivoted via side door hinges 11 in the lower region of the cooking appliance. The muffle opening 5 is from a muffle flange on the front

13 moved. An annular seal 15 is attached to the muffle flange 13 and extends around the muffle opening 5 on the circumferential side.

FIG. 2 shows the cooking appliance with the cooking appliance door 9 closed. In this case, the cooking appliance door 9 is in contact with the ring seal 15 with its inside facing the cooking chamber 1. The muffle flange 13 on the front is spaced apart from the cooking appliance door 9 by an intermediate space 16, which is approximately 7 mm. According to FIG. 2, a heating element 17 is attached to an underside of a muffle base of the cooking appliance muffle 3, in which a bottom heating element 18 is held. The radiator housing 17 extends to close to the muffle flange 13 on the front. An oven lamp 21 is also arranged below the muffle base. The housing 22 is held in the front muffle flange 13. The light from the lamp 21 is reflected into the cooking space 1 via the cooking device door 9.

The structure of the cooking appliance door 9 can be seen in FIG. 3. As a result, the cooking appliance door 9 has a rectangular door frame 25 which runs on the circumference and is made from a deep-drawn sheet metal. A door handle 27 is fastened to an upper frame bar of the door frame 25. The cooking appliance door also has a cooking chamber 1 facing Door inner pane 29 and a front door outer pane 31, which are spaced apart. For reasons of cleaning, the inner door pane 29 is removably held on the door frame 25 by means of latching connections (not shown). The front outer pane 31, however, is firmly connected to the door frame 25. The two panes 29, 31 are made of a translucent glass ceramic material and have opaque prints 33. These move translucent rectangular viewing areas or viewing windows 34 of the door panes 29, 31. Together with the spaced-apart door panes 29, 31, the door frame 25 delimits a door interior 37 which is adequately sealed from the outside against moisture. In the lower corner areas of the door frame 25, movable hinge parts 26 of the door hinges 11 can be seen, which are fastened within the door frame 25. The movable hinge parts 26 can be suspended in corresponding housing-side fixed hinge parts of the door hinge 11.

In the door interior 37 there are two elongated reflectors 39 as shown in FIG is dimensionally stable. One of the reflectors 39 is shown in FIGS. 4a to 4c. Accordingly, the reflector is almost U-shaped in cross section, so that it extends in a longitudinal direction trough-shaped. The reflector 39 has a flat channel floor 40 which is surrounded by raised longitudinal side walls 41. The channel floor 40 and the longitudinal side walls 41 delimit a light guiding space 49.

The transverse reflector surfaces 42, 43, 44, which run transversely to the channel bottom 40 and to the longitudinal side walls 41, are arranged within the light guide space 49. The outer transverse reflector surfaces 43, 44 close the opposite narrow sides of the reflector 39. As shown in FIG. 4c, the upper free edges 45 of the outer transverse reflector surfaces 43, 44 and the longitudinal side walls 41 run flush at the same distance from the channel bottom 40. The flush course the upper edges 45 is interrupted by a gradation into which a cover described later can be inserted. Both the channel bottom 40, the longitudinal side walls 41 and the transverse reflector surface 44 are flat. In contrast, the transverse reflector surfaces 42, 43 are dome-shaped. On the outside, on the longitudinal side walls of the reflector 39, assembly hooks 46 are formed, which are hooked into corresponding sections of the door frame 35, not shown, for holding the reflector 39. On the opposite longitudinal side wall 41, mounting lugs 47 are formed on the outside, which can be used for the optional mounting of a further middle door pane, not shown. Edge transitions 48 between the transverse reflector surfaces 42, 43, 44 and the longitudinal side walls 41 and the channel bottom 40 are rounded.

It can be seen from FIG. 3 that the two reflectors 39 are arranged mirror-symmetrically to one another on the sides of the right-angled viewing window 34. The reflectors 39 are spaced with their upper free edges 45 in contact with the inner door pane 29 or only slightly therefrom. Thus, the reflector 39, together with the door inner pane 29, delimits a light guiding space 49 which is essentially closed off on the door interior side. Alternatively, an additional sealing element for sealing light gaps can be provided between the free upper edge 45 of the reflector 39 and the door inner pane 29. A light emission from the light guiding space 49 into the door interior 37 is thus largely reduced.

Additional translucent areas 51 are provided in the printing 33 of the inner door pane 33, which project from the sides of the rectangular viewing window 34. The translucent areas 51 extend in the upper area of the viewing window and are aligned with the light guiding space 46 of the reflectors 39. Light reflected by the reflector 39 can be reflected into the cooking space 1 through the translucent areas 51 of the inner door pane 29. Furthermore, circular optical windows 53 are formed in the lower area of the inner door pane 29, which are also translucent areas in the printing 33. The optical windows 53 are aligned with the transverse reflector surfaces 44 of the reflectors 39. Each light of the lamp 21 thus shines through the corresponding window 53 onto the opposite transverse reflector surface 44. The transverse reflector surface 44 is inclined relative to the channel bottom 40 in such a way that the incident light is introduced into the light guiding space 49, as is indicated in FIG. 2 , As a result, a beam of light between the transverse reflector surfaces 42, 43, 44 runs essentially parallel to the longitudinal side walls 41 and to the channel bottom 40. Part of the light strikes the central transverse reflector surface 42 and is reflected from there as a cone of light K into the cooking space 1 , The central transverse reflector surface 42 is arranged in the light guiding space 49 below the upper edge 45 of the reflector 39. According to FIG. 2, this results in a light passage gap 54 between the central transverse reflector surface 42 and the inner door pane 29. A part of the light is passed on to the downstream transverse reflector surface 43 through this gap 54. This reflects the light as a further light cone K into the cooking space 1. The two transverse reflector surfaces 42, 43 are aligned in such a way that their light cones K radiate the cooking space 1 obliquely downwards. Thus, advantageously only the top of baking trays arranged in the cooking space 1 is illuminated.

The reflectors 39 are completely mirrored on the inside. A smaller proportion of the light introduced into the light guiding space 49 of the reflector 39 is thus also reflected on the mirrored longitudinal side walls 40 and the channel bottom 41 in the cooking space 1 as a diffuse scattered light D (see FIG. 2). The longitudinal side walls 40 and the channel bottom 41 serve - in addition to the transverse reflector surfaces - as additional longitudinal reflector surfaces. The diffuse scattered light D is reflected into the cooking space 1 at any angle. The combination of the bundled light cones K with the diffuse scattered light D achieves the following: On the one hand, the food on the baking trays in the cooking space is visually highlighted by the light cones K. On the other hand, edge zones in the cooking space 1 are also adequately illuminated by the diffuse scattered light D. Due to the rounded transitions 48 between the first and second reflector surfaces, the low light intensity of the diffuse scattered light D continuously changes into the high light intensity of the light cone K. Such a continuous transition of the light intensity is further improved if the transverse reflector surfaces 42, 43 are roughened. As a result, a small part of the light reflected into the cooking space by the second transverse reflector surfaces 42, 43 is reflected as diffuse scattered light.

According to FIG. 3, the open top of the reflectors 39 is covered in the area between the central transverse reflector surface 42 and the lower transverse reflector surface 44 by a cover 56 mirrored on the inside. This is a in the reflector 39 opaque light channel 59 formed. This ensures that the light is guided from the lower transverse reflector surface 44 to the central transverse reflector surface 42 almost without loss of light. For aesthetic reasons, the cover 56 is arranged behind the printing 33 of the inner door pane 29 so that it is not visible. The cover 56 is arranged in a step recessed in the upper free edge 45 and ends flush with the upper free edge 45 of the reflector 39.

The lamp 21 is arranged in the lamp housing 22 according to FIG. 2. The lamp housing 22 is of hollow cylindrical design and is oriented obliquely upwards at an angle of approximately 10 ° in order to increase the distance from the lower heat radiator 18. The lamp housing 22 is held in the front muffle flange 13 with an open end. The housing end held in the muffle flange 13 is surrounded by a frame-like light channel element 58. The light channel element 58 is placed on the front of the muffle flange 13. It thus protrudes into the space 16 between the muffle flange 13 and the door inner pane 29.

When the cooking appliance door 9 is closed, an end face of the frame-like light channel element 58 projecting into the intermediate space 16 is in contact with the inner window pane 29 or is only slightly spaced therefrom. In Figure 2, this distance is approximately 1 to 2 mm. The light channel element 58 thus forms a light channel which is sufficiently closed with respect to the intermediate space 16 and through which the light from the lamp 21 is transmitted into the cooking appliance door 9. Adverse lighting effects in the bottom area of the cooking appliance can thereby be largely reduced. At the same time, the light is transmitted from the cooking device-side lamp 21 to the door-side transverse reflector surface 44 with almost no losses.

In order to reduce heat dissipation from the cooking space 1, the cooking space 1 together with the radiator housing 17 is surrounded by a heat insulation jacket 61. The heat insulation jacket 61 almost completely fills a housing space provided outside the cooking device muffle 3.

As can be seen from FIG. 5, a partition plate 63 is provided in the housing space in the area of the lamp 21. The partition plate 63 forms a hollow chamber 65 which is separated from the heat insulation jacket 61 and in which the lamp 21 is arranged. The partition plate 63 serves as an additional heat protection between the lamp 21 and the lower heat radiator 18. In addition, a stationary hinge part 67 of the door hinge 11 is provided in the hollow chamber 65. The hinge part 67 is usually made of a solid deep-drawn sheet and has a correspondingly large heat storage capacity. The lamp 21 is spaced only slightly over approximately 5 cm from the fixed hinge part 67 of the door hinge 11. Waste heat of the lamp 21 which arises due to the operation can thus be dissipated to the stationary hinge part 67 via a heat radiation indicated by arrows in FIG. 5. This reduces the operating temperature of the lamp 21 and increases its service life accordingly.

To further reduce the operating temperature of the lamp 21, the hollow chamber 65 can form part of an air duct 67. The air guide duct 67 has air inlet slots 69 on the housing bottom, through which air can enter the duct 67. The air duct 67 extends outside the cooking device muffle 3 vertically upwards to a blower chamber 69 provided above the cooking device muffle 3. A known cooling air blower arrangement 71 is provided in the blower chamber 69, which sucks air out of the blower chamber 69 in the direction of the arrow to electronic components of the cooking device to cool. According to the invention, ambient air is thus first sucked into the hollow chamber 65 on the bottom side. The sucked-in air flows around the lamp 21 in the direction of the arrow and is guided into the blower chamber 69 via the air duct 67.

Claims

1. Cooking device with a cooking space (1) and a cooking device door (9) for closing the cooking space (1) and a lighting device (21, 39) for illuminating the cooking space (1), which has at least one reflector (39) in one Door interior (37) of the cooking appliance door (9) is arranged and the light one

Light source (21) of the lighting device reflects into the cooking space (1), characterized in that the reflector (39) delimits a light guiding space (49) which is translucent to the cooking space (1) on the inside of the door.

2. Cooking appliance according to claim 1, characterized in that the cooking appliance door (9) has an at least partially transparent door inner pane (29) which, together with the reflector (39), delimits the light guiding space (46).

3. Cooking appliance according to one of the preceding claims, characterized in that the reflector (39) is trough-shaped with raised side walls (43, 44).

4. Cooking appliance according to one of claims 2 or 3, characterized in that the reflector (39) is in contact with the door inner pane (29) or is slightly spaced therefrom.

5. Cooking appliance according to one of claims 2 to 4, characterized in that a sealing element for sealing a light gap is arranged between the reflector (39) and the door inner pane (29).

6. Cooking appliance according to one of the preceding claims, characterized in that the light guide space (49) is designed as a cavity.

7. Cooking appliance according to one of claims 2 to 6, characterized in that the inner door pane (29) is detachably mounted on the cooking appliance door (9).

8. Cooking appliance according to one of the preceding claims, characterized in that the reflector (39) has at least one first reflector surface (40, 41) which reflects the light from the light source (21) as diffuse scattered light (D) into the cooking space (1) ,

9. Cooking appliance according to one of the preceding claims, characterized in that the reflector (39) has at least one second transverse reflector surface (42, 43, 44) which is arranged transversely to the first reflector surface (40, 41).

10. Cooking appliance according to claim 9, characterized in that the second transverse reflector surface (42, 43, 44) the light as a light cone (K) in the cooking space

(1) reflected.

11. Cooking appliance according to one of claims 9 or 10, characterized in that the second transverse reflector surface (42, 43, 44) is flat or curved.

12. Cooking appliance according to one of claims 8 to 11, characterized in that one of the transverse reflector surfaces (44) deflects the light from the light source (21) in the direction of the further transverse reflector surfaces (42, 43).

13. Cooking appliance according to one of claims 8 to 13, characterized in that the first and / or second reflector surface (40 to 44) are integrally formed with the reflector (39).

14. Cooking appliance according to one of the preceding claims, characterized in that the light source (21) is arranged outside the reflector (39) and light in

Direction of the reflector (39) shines.

15. Cooking appliance according to one of claims 9 to 17, characterized in that the transverse reflector surfaces (42, 43) arranged in the light guide space (49) of the reflector (39) are offset from one another.

16. Cooking appliance according to one of the preceding claims, characterized in that the light source (21) outside the light guide space (46) of the reflector (39) is arranged.

17. Cooking appliance according to one of the preceding claims, characterized in that the reflector (39) has an outwardly opaque light channel (59).