EP1620680B1 - Cooking device - Google Patents

Abstract

A cooking device includes a cooking chamber and a lighting unit for illuminating the cooking chamber. The lighting unit includes a light source and a reflector having at least one reflector area, which reflects the light from the light source into the cooking chamber as diffuse scattered light (D). The lighting unit includes at least a second reflector area, which reflects light from the light source into the cooking chamber as one or more light cones (K).

Description

The invention relates to a cooking appliance with a cooking chamber and a lighting device for illuminating the cooking chamber, which has at least one reflector with at least a first reflector surface, which reflects the light of the illumination device as a diffused scattered light in the oven.

Out DE-A-38 08 716 is a device for illuminating the interiors of household appliances known. The lighting device is integrated in a baking oven door and has arched reflectors, which are formed elongated and have a parabolic cross-section and are arranged to extend in height of the viewing window. The reflectors are preferably several. Associated with luminous body. As a result, a glare-free and extremely uniform interior illumination of the oven muffle or the cooking chamber is achieved in all loading days without interference in one of the muffle walls.

Out DE-A-36 43 354 is another lighting device for a closable by a oven door oven known. In a door interior of the oven door lamps and associated inclined reflector surfaces are arranged. As a result, an optimal illumination of the oven is obtained, the lamps are not visible from the outside.

The font DE-A-35 11 575 shows a cooking appliance with the features of the preamble of claim 1.

The object of the invention is to provide a cooking appliance with a cooking chamber which is illuminated in a visually appealing manner.

The object of the invention is achieved by a cooking appliance having the features of claim 1. The second transverse reflector surfaces according to the invention reflect the light of the illumination device bundled in the cooking chamber in such a way that the cooking product located on baking trays is optically highlighted. By contrast, the first reflector surface reflects diffused scattered light for uniform illumination of the cooking chamber.

It is particularly preferred if the second reflector surface reflects the light in the form of a cone of light into the cooking chamber, which widens in the direction of the food to be cooked. As a result, a large-scale and intense lighting of the food is guaranteed.

Alternatively, it may be optically preferred if the beam path of the light reflected by the transverse reflector surface is directed almost parallel to the food to be cooked. In this case, the collimated light strikes a relatively small area of the baking tray.

For bundling the light of the illumination device, the transverse reflector surface may be flat or curved in the direction of radiation. In this case, the transverse reflector surface is aligned like a camber mirror in the direction of the cooking chamber.

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

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

A particularly harmonious illumination of the cooking chamber results when a transition between the first and the second reflector surface is rounded. As a result, a continuous transition of the light intensity between the collimated light and the diffused scattered light is achieved. In this context, it is also advantageous if the surface structure of the second reflector surface is roughened. The second transverse reflector surface thus generates not only focused light but also a small amount of diffused scattered light. This also results in a steady transition of the light intensity between the collimated light and the diffused scattered light.

It when the reflector is arranged in a cooking appliance door for closing the cooking chamber is particularly advantageous. In this case, a glare-free illumination of the cooking chamber is made possible because the reflector in a line of sight of the user reflects the light of the light source in the oven.

Advantageously, the light source of the illumination device can be arranged outside the cooking appliance door and emit light onto the reflector arranged inside the cooking appliance door. Thus, a spatially separated from the reflector arrangement of the light source is executable. 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.

The first reflector surface of the reflector is curved like a channel. Here a U-shaped or parabolic-shaped channel shape of the first reflector surface is particularly advantageous in order to obtain an optimal light distribution of the diffused scattered light in the cooking chamber. Furthermore, the first reflector surface can advantageously delimit a light guidance space. In this, the light of the light source collects and is reflected from there in the cooking chamber. Loss of light in the reflection of the light at the reflector are thus reduced. It is advantageous if the transverse reflector surface is arranged within the light guide space, which reflects bundled light into the cooking chamber.

In order to achieve a largely closed to the outside light guide space, the front ends of the channel-shaped curved first Reflector surface closed by transverse reflector surfaces. This gives the reflector an advantageous trough shape, whereby a loss of light is reduced at its front ends.

It may be advantageous if the reflector has an outwardly opaque light channel. Through the light channel, the light can be transmitted without light losses between spaced reflector surfaces. The lossless light transport in the reflector increases the luminous efficacy.

It is particularly advantageous if the light guiding space of the reflector is closed on the door interior side. Loss of light in the door interior can be largely reduced. It is preferred in this case if the reflector, together with a door inner pane facing the cooking chamber, closes the light guiding space. As a result, light gaps through which light exits into the door interior, largely prevented.

Figur 1

in einer perspektivischen Ansicht ein Gargerät mit geöffneter Gargerätetür;

Figur 2

in einer Seitenschnittansicht einen Ausschnitt des Gargerätes;

Figur 3

in einer perspektivischen Ansicht die Gargerätetür mit einer teilweise weggebrochenen Türinnenscheibe;

Figuren 4a bis 4c

einen in der Gargerätetür angeordneten Reflektor in einer Ansicht von oben und von der Seite sowie in einer perspektivischen Ansicht; und

Figur 5

eine Vorderansicht des Gargerätes ohne die Gargerätetür sowie in einem Teilschnitt.

Hereinafter, an embodiment of the invention with reference to the accompanying figures will be described. Show it:

FIG. 1

in a perspective view of a cooking appliance with open cooking appliance door;

FIG. 2

in a side sectional view a section of the cooking appliance;

FIG. 3

in a perspective view of the cooking appliance door with a partially broken door inner pane;

FIGS. 4a to 4c

a arranged in the cooking appliance reflector in a view from above and from the side and in a perspective view; and

FIG. 5

a front view of the cooking appliance without the cooking appliance door and in a partial section.

In the FIG. 1 a cooking appliance with a cuboid cooking appliance muffle 3 is shown. The cooking appliance muffle 3 has a front muffle opening 5. On the two side walls of the Gargerätemuffel 3 horizontal slide-in ribs 7 are formed. These are used to insert and support baking trays in horizontal cooking levels. The front muffle opening 5 is closed by a front cooking appliance door 9. This is articulated via lateral door hinges 11 pivotally in the lower region of the cooking appliance. The muffle opening 5 is surrounded by a front muffle flange 13. On the muffle flange 1.3, a ring seal 15 is attached, which extends circumferentially around the muffle opening 5.

In the FIG. 2 the cooking appliance is shown with the cooking door 9 closed. In this case, the cooking appliance door 9 with its inner side facing the cooking chamber 1 is in contact with the annular seal 15. The front-side muffle flange 13 is spaced from the cooking appliance door 9 by an intermediate space 16 which is approximately 7 mm. On an underside of a muffle bottom of the cooking appliance muffle 3 is in accordance with the FIG. 2 a radiator 17 is mounted, in which a bottom heat radiator 18 is supported. The radiator housing 17 extends close to the front muffle flange 13. Also below the muffle floor an oven lamp 21 is arranged. Its housing 22 is held in the front muffle flange 13. The light of the lamp 21 is reflected on the cooking appliance door 9 in the cooking chamber 1.

The structure of the cooking appliance door 9 is in the FIG. 3 seen. Accordingly, the cooking appliance door 9 has a peripherally extending rectangular door frame 25 made of a deep-drawn sheet metal. On an upper frame strip of the door frame 25, a door handle 27 is attached. The cooking appliance door further comprises a cooking chamber 1 facing the inner door panel 29 and a front door outer panel 31, which are spaced from each other. For cleaning reasons, the inner door panel 29 is detachably supported on the door frame 25 by means not shown detent connections. The front outer pane 31, however, is firmly connected to the door frame 25 in connection. The two discs 29, 31 are made of a translucent glass-ceramic material and have opaque imprints 33. These each move translucent rectangular viewing areas or viewing window 34 of the door panels 29, 31. The door frame 25 adjoins, together with the spaced apart door panels 29, 31 a door interior 37, which is outwardly to moisture is sufficiently sealed. In the lower corner regions of the door frame 25, movable hinge parts 26 of the door hinges 11 can be seen, which are fastened inside the door frame 25. The movable hinge parts 26 can be hung in corresponding housing-side fixed hinge parts of the door hinge 11.

In the door interior 37 are located according to the FIG. 3 two elongate reflectors 39. These are arranged behind the impression 33 of the door outer panel 31 and extend along the sides of the viewing window 34. The reflectors 39 are made of a solid plastic injection-molded part, which is resistant to heat loads and dimensionally stable. One of the reflectors 39 is in the FIGS. 4a to 4c shown. Accordingly, the reflector is formed in cross-section almost U-shaped profile, so that it extends in a trough-shaped manner in a longitudinal direction. The reflector 39 has a flat channel bottom 40 which is surrounded by raised longitudinal side walls 41. The channel bottom 40 and the longitudinal side walls 41 adjoin a light guiding space 49.

Within the light guide space 49, the transverse reflector surfaces 42, 43, 44 are arranged, which extend transversely to the channel bottom 40 and to the longitudinal side walls 41. The outer transverse reflector surfaces 43, 44 close the opposite narrow sides of the reflector 39. As in the Figure 4c is shown, the upper free edges 45 of the outer transverse reflector surfaces 43, 44 and the longitudinal side walls 41 are flush at the same distance from the channel bottom 40. The flush course of the upper edges 45 is interrupted by a gradation, in which a cover described later can be used.

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 formed dome-shaped curved. On the outside 39 mounting hooks 46 are formed on the longitudinal side walls of the reflector 39, which are mounted for supporting the reflector 39 in corresponding sections, not shown, of the door frame 35. At the opposite longitudinal side wall 41 mounting projections 47 are formed on the outside, which can serve for the optional mounting of another, not shown middle door glass. Edge transitions 48 between the transverse reflector surfaces 42, 43, 44 and the longitudinal side walls 41 and the channel bottom 40 are rounded.

Of the FIG. 3 can be taken that the two reflectors 39 are arranged mirror-symmetrically to each other on the sides of the rectangular viewing window 34. The reflectors 39 are with their upper free edges 45 in contact with the inner door panel 29 or only slightly spaced therefrom. Thus, the reflector 39, together with the door inner pane 29, delimits a light guiding space 49, which is substantially closed on the door interior side. Alternatively, an additional sealing element for sealing light gaps between the free upper edge 45 of the reflector 39 and the inner door panel 29 may be provided. A light exit from the light guide room 49 in the door interior 37 is thus largely reduced.

In the printing 33 of the door inner pane 33, additional light-transmitting areas 51 are provided 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. Reflected by the reflector 39 light can be reflected by the light-transmitting areas 51 of the door inner pane 29 in the cooking chamber 1. Furthermore, 29 circular optical window 53 are formed in the lower portion of the inner door panel, which are also light-transmissive areas in the imprint 33. The optical windows 53 are aligned with the transverse reflector surfaces 44 of the reflectors 39. Thus, each of the lamp 21 radiates collimated light through the corresponding window 53 to the opposite transverse reflector surface 44. The transverse reflector surface 44 is inclined relative to the channel bottom 40 so that the incident light is introduced into the light guide space 49, as shown in the FIG. 2 is indicated.

Accordingly, a beam path of the light between the transverse reflector surfaces 42, 43, 44 extends substantially parallel to the longitudinal side walls 41 and the channel bottom 40. A portion of the light strikes the central transverse reflector surface 42 and is reflected from there as a light cone K in the cooking chamber 1 , The middle transverse reflector surface 42 is arranged in the light guide space 49 below the upper edge 45 of the reflector 39. This results according to the FIG. 2 between the central transverse reflector surface 42 and the inner door panel 29, a light passage gap 54. Through this gap 54 is a part of Light forwarded to the downstream transverse reflector surface 43. This reflects the light as another light cone K in the cooking chamber 1 into it. The two transverse reflector surfaces 42, 43 are aligned such that their light cone K radiate obliquely down the cooking chamber 1. Thus, advantageously only the top of arranged in the cooking chamber 1 baking sheets is illuminated.

The reflectors 39 are completely mirrored on the inside. A lesser proportion of the light introduced into the light guide 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 chamber 1 as a diffused scattered light D (see FIG. 2 ) reflected. The longitudinal side walls 40 and the channel bottom 41 serve - in addition to the transverse reflector surfaces - as additional longitudinal reflector surfaces. The diffused scattered light D is reflected at arbitrary angles into the cooking chamber 1. By combining the bundled light cones K with the diffused scattered light D, the following is achieved: On the one hand, food to be cooked is visually highlighted on the baking trays in the cooking chamber by the light cones K. On the other hand, edge zones in the cooking chamber 1 are illuminated by the diffused scattered light D in a sufficient manner. Due to the rounded transitions 48 between the first and second reflector surfaces, the low light intensity of the diffused scattered light D changes continuously into the large light intensity of the light cone K. Such a steady transition of light intensity is further enhanced when the transverse reflector surfaces 42, 43 are roughened. As a result, a small part of the light reflected by the second transverse reflector surfaces 42, 43 into the cooking chamber is reflected as diffused scattered light.

According to the FIG. 3 the open top of the reflector 39 is covered in the area between the central transverse reflector surface 42 and the lower transverse reflector surface 44 by an inside mirrored cover 56. As a result, an opaque light channel 59 is formed in the reflector 39. This ensures that the light from the lower transverse reflector surface 44 is conducted to the central transverse reflector surface 42 with virtually no light losses. For aesthetic reasons, the cover 56 is arranged behind the printing 33 of the inner door panel 29 visible. The lid 56 is arranged in a recessed in the upper free edge 45 gradation and terminates flush with the upper free edge 45 of the reflector 39 from.

The lamp 21 is in accordance with FIG. 2 arranged in the lamp housing 22. The lamp housing 22 is formed as a hollow cylinder and is oriented obliquely upward at an angle of about 10 ° in order to increase the distance to the lower heat radiator 18. With an open front end, the lamp housing 22 is supported in the front muffle flange 13. 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 set on the muffle flange 13 at the front. It thus protrudes into the intermediate space 16 between the muffle flange 13 and the inner door 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 door pane 29 or is only slightly spaced therefrom. In the FIG. 2 this distance is about 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 of 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 to the door-side transverse reflector surface 44 with almost no loss from the appliance-side lamp 21.

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

Like from the FIG. 5 As can be seen, a separating plate 63 is provided in the housing space in the area of the lamp 21. The separating plate 63 forms a hollow chamber 65 separated from the heat-insulating jacket 61, 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 the hollow chamber 65, a fixed hinge part 67 of the door hinge 11 is also provided. The hinge part 67 is usually made of a solid deep-drawn sheet metal and has a correspondingly large heat storage capacity. The lamp 21 is only slightly above about 5 cm from the stationary hinge part 67 of the door hinge 11 spaced. Operating waste heat generated by the lamp 21 can thus have a in the FIG. 5 indicated by arrows heat radiation to the fixed hinge part 67 are derived. As a result, the operating temperature of the lamp 21 is reduced and its life is increased accordingly.

To further reduce the operating temperature of the lamp 21, the hollow chamber 65 may form part of an air duct 67. The air duct 67 has housing-bottom air inlet slots 69 through which air can enter the channel 67. The air duct 67 extends outside the cooking appliance muffle 3 vertically up to a above the Gargerätemuffel 3 provided blower chamber 69. In the blower chamber 69, a known Kühlluftgebläseanordnung 71 is provided, which sucks in the arrow direction air from the blower chamber 69 to electronic components of the cooking appliance to cool. According to the invention, ambient air is thus initially sucked into the hollow chamber 65 on the bottom side. The sucked air flows around in the direction of arrow the lamp 21 and is passed through the air duct 67 into the blower chamber 69.

Claims (19)

1. Cooking appliance with a cooking chamber (1) as well as a lighting device (21; 39) for illumination of the cooking chamber (1), which comprises at least one reflector (39) with at least one first reflector surface (40, 41), which the reflects the light from a light source (21) of the lighting device as diffuse scattered light (D) into the cooking chamber (1), wherein the at least one reflector (39) has second transverse second reflector surfaces (42, 43, 44) which are arranged transversely with respect to the at least one first reflector surface (40, 41) and which reflect the light of the light source (21) as a beam into the cooking chamber (1), characterised in that the at least one first reflector surface (40, 41) is of curved channel-shaped construction and the ends of the at least one first reflector surface (40, 41) of channel-shaped curved construction are closed by the second transverse reflector surfaces (43, 44).
2. Cooking appliance according to claim 1, characterised in that the transverse reflector surfaces (42, 43, 44) reflect the light as a light cone (K) into the cooking chamber (1).
3. Cooking appliance according to claim 1, characterised in that the transverse reflector surfaces (42, 43, 44) reflect the light into the cooking chamber (1) in an almost parallel beam course.
4. Cooking appliance according to any one of the preceding claims, characterised in that the transverse reflector surfaces (42, 43, 44) are formed to be planar or curved.
5. Cooking appliance according to any one of the preceding claims, characterised in that one of the transverse reflector surfaces (44) deflects the light of the light source (21) in direction onto the further transverse reflector surfaces (42, 43).
6. Cooking appliance according to any one of the preceding claims, characterised in that the at least one first reflector surface (40, 41) bounds a light guidance space (49).
7. Cooking appliance according to claim 6, characterised in that the transverse reflector surfaces (42, 43, 44) are arranged in the light guidance space (49).
8. Cooking appliance according to any one of the preceding claims, characterised in that the at least one first and/or the second reflector surfaces (40, 41, 42, 43, 44) is or are formed integrally with the at least one reflector (39).
9. Cooking appliance according to any one of the preceding claims, characterised in that a transition (48) between the at least one first reflector surface (40, 41) and the second transverse reflector surfaces (42, 43, 44) is rounded.
10. Cooking appliance according to any one of the preceding claims, characterised in that a surface structure of at least the second transverse reflector surfaces (42, 43, 44) is roughened.
11. Cooking appliance according to any one of the preceding claims, characterised in that the at least one reflector (39) is arranged in a cooking appliance door (9) for closing the cooking chamber (1).
12. Cooking appliance according to any one of claims 6 and 7 or 8 to 11 in conjunction with claim 6 or 7, characterised in that the light guidance space (49) of the at least one reflector (39) is light-permeable towards the cooking chamber (1).
13. Cooking appliance according to any one of claims 6 to 12, characterised in that a light channel (59) impermeable to light towards the outside is formed in the at least one reflector (39).
14. Cooking appliance according to any one of the preceding claims, characterised in that the light source (21) is arranged outside the cooking appliance door (9) and radiates light in the direction of the at least one reflector (39).
15. Cooking appliance according to any one of claims 6, 7 and 12 or 8 to 11, 13 or 14 in conjunction with claim 6, 7 or 12, characterised in that the light guidance chamber (49) of the at least one reflector (39) is closed at the door interior space side.
16. Cooking appliance according to any one of the preceding claims, characterised in that the at least one reflector (39) together with a door inner pane (29) facing the cooking chamber (1) closes the light guidance space (49).
17. Cooking appliance according to any one of claims 11 or 12 to 16 in conjunction with claim 11, characterised in that at least one mounting section (46) for fastening the at least one reflector (39) within the cooking appliance door (9) is formed at the at least one reflector.
18. Cooking appliance according to any one of claims 11 or 12 to 17 in conjunction with claim 11, characterised in that at least one mounting projection (47) for mounting an intermediate pane in the cooking appliance door (9) is formed at the at least one reflector (39).
19. Cooking appliance according to any one of claims 6, 7 or 8 to 18 in conjunction with claim 6 or 7, characterised in that the transverse reflector surfaces (42, 43) arranged in the light guidance space (49) of the at least one reflector (39) are arranged to be offset relative to one another.

Images