EP2827064A1 - Cooking apparatus with light elements - Google Patents

Abstract

The invention relates to a cooking appliance with a cooking surface (10), consisting of a glass or glass ceramic material, wherein at least one heating element (20) and at least one lighting element (30) are arranged in the region below the underside (12) of the cooking surface (10). wherein the heating element (20) by means of a pressing device (40) indirectly or directly under bias of one or more spring elements (41) on the underside (12) of the cooking surface (10). To improve the reliability of such a cooking appliance, it is provided according to the invention that the one or more lighting elements (30) and the at least one heating element (20) on a common support portion (42) of the pressing device are arranged such that they are adjustable at a vibration of the cooking surface ,

Description

The invention relates to a cooking appliance with a cooking surface, consisting of a glass or glass ceramic material, wherein in the area below the underside of the cooking surface at least one heating element and at least one light-emitting element are arranged, wherein the heating element by means of a resiliently acting pressing indirectly or directly, for example. Under bias one or more spring elements or spring-acting trusses or mounting plates rests against the underside of the cooking surface.

Cooking devices with light elements are known from the prior art, in which the light elements are used to display operating conditions. Induction cooking appliances are usually formed today with a glass ceramic disk as a cooking surface. In principle, other materials, such as tempered soda-lime glass or borosilicate glass can be used as cooking surface material if thermal overheating of these temperature-sensitive materials can be avoided. All materials, both glass ceramic and soda lime glass or borosilicate glass are brittle materials. In order to avoid breakage of glass during assembly, transport or operation of the cooking appliance in the kitchen, constructive measures must be taken to avoid breakage of the cooking surface. A glass or glass ceramic cooking surface can not balance the energy of a falling pot by deformation of the surface, such as a metal surface it could. Rather, the energy has to be transmitted to the environment through vibrations. If it is prevented, then the shock load leads to breakage of the cooking surface. For this reason, cooking surfaces are installed in such a way that they can avoid shock loads, for example when a pot falls down on the cooking surface. The heating elements, in particular induction coils are resiliently pressed against the underside of the cooking surface, so that they can also give in at the impact load.

Lighting elements are used for cooking zone marking or for visualization of operating conditions, such as cooking situations or dangerous situations. To ensure good visibility, the lighting elements should be as close as possible to the bottom of the cooking surface. Then losses due to scattering are kept low and it is possible to achieve a good image sharpness and brightness of the light-emitting elements. The lighting elements themselves can be made of glass or glass ceramic and have the property that the light output along the length of the light element can be defined if necessary. In case of impact load (falling pot) on the cooking surface in this case is now double risk. On the one hand, the cooking surface can strike and break during deflection on the light element. On the other hand, however, the light element can be damaged or both components are unusable by the blow at the same time. From the DE 38 31 233 A1 a cooking appliance is known in which a heating element is arranged below the cooking surface. In this case, the heating element is supported by a housing. To the housing, a neck housing is screwed laterally. The attachment housing carries a light source which couples its light into a light element designed as a light guide. The light guide is annular and surrounds the heating element.

Another cooking appliance is out of the DE 40 02 322 A1 known. As with the DE 38 31 233 A1 is used here as a light source an annular light guide. This is embedded in the insulating material of the heating element.

Another annular light guide is from the DE 43 35 893 A1 known.

It is an object of the invention to provide a cooking appliance of the type mentioned, in which the reliability is improved.

This object is achieved in that the one or more lighting elements and that at least one heating element are arranged on a common support portion of the pressing device such that they are adjustable at a deflection and / or vibration of the cooking surface.

In a shock load, the lighting element can now be deflected together with the heating element to allow oscillation of the cooking surface. This reduces the risk of breakage of the cooking surface. On the other hand, however, the light element is protected from damage. The fact that the luminous element and the heating element are arranged on a common support portion of the pressing device, also a simple construction is realized, which can be finished with low parts and assembly costs. The construction of the Cooking appliance can be selected in the invention in particular so that the lighting elements are mounted in a fixed position relative to the heating element.

Preferably, the construction according to the invention is individualized in such a way that at least one spring element acting on the pressing device can be deflected during an adjustment of the luminous element and of the heating element. As a result, damage to the lighting element is excluded by striking the cooking surface.

According to a variant of the invention, it can be provided that at least one spring element acting on the pressing device can be deflected during an adjustment of the lighting element and of the heating element. In this case, in particular the aforementioned rigid association of the luminous element can be used for heating element, whereby the distance of the luminous element to the underside of the cooking surface does not change at impact or bending load. For this purpose, it can also be provided that the support portion itself is designed resiliently.

Additionally or alternatively, it can also be provided that the luminous element is spring-biased against the pressing device supported. With the light element relative to the pressing device supporting spring elements and the spring elements which bias the support portion of the pressing, can be carried out on a suitable choice of the spring constant individual vote on the selected cooking surface.

Preferably, it is provided that the luminous element is arranged at a distance to the underside of the cooking surface, wherein preferably a distance in the range of 0.2 to 10 mm, particularly preferably 0.5 to 5 mm, particularly preferably 0.5 to 2 mm is provided , Due to the spacing and the spring preload of the support section a hitting the cooking surface is reliably prevented on the light-emitting element. The distance range between 0.5 mm to 5 mm guaranteed with simultaneous damage, especially in large-sized colored glass or glass ceramic materials for the cooking surface a sufficiently high light output for visualization of a display on the cooking surface front. For such normal to small cooking surfaces can be gone to a distance range of 0.5 to 2 mm. A distance range of up to 10 mm can be provided if high deflections / displacements are expected, for example, in the case of large formats which are at the same time mounted in a swingable manner.

According to a variant of the invention it can be provided that the support portion carries a plurality of heating elements, wherein the heating elements are arranged in at least one row. With this arrangement, the design effort for a cooking appliance can be significantly simplified. In this case, it may also be provided that a plurality of support sections are arranged below the cooking surface, which extend in width or depth directions of the cooking surface. In this way, in particular, an induction cooking appliance can be constructed, in which the entire cooking surface is acted upon by heating elements in order to be able to carry out a freely selectable positioning of a pot on the cooking surface.

If it is provided that the support portion is part of a carrier which receives the at least one heating element and the at least one luminous element, then a uniform assembly is formed, which can be installed with little effort. In the case of maintenance, this module can then also exchange targeted.

In this case, a further optimization of the carrier is achieved in that it is designed like a housing and has at least one laterally molded receptacle for the luminous element. For the same purpose, the carrier may also have a different construction, for example be configured disc-shaped.

Particularly preferably, the heating element and the lighting element can be electrified at a common electrical connection of the carrier. As a result, a clear and simple contacting of the heating elements is possible.

A conceivable variant of the invention is such that the luminous element is arranged between two heating elements.

If a cooking appliance according to the invention is such that the luminous element has a luminous means and a light guide with at least one light guide section into which the light source couples its light, and the light guide section or a further light guide section coupled to the light guide section has a radiation region over which the light from the light source Illuminant is radiatable toward the bottom of the cooking surface, then specific lighting situations can be generated specifically. The temperature-sensitive lighting means may in particular also be arranged away from the heating elements. With the Lichtleitabschnitten can be punctual or surface-shaped luminous phenomena.

If it is provided that the at least two light-guiding sections merge into one another in one piece via an angling, then a low part and assembly effort can initially be achieved via the one-piece design. About the Lichtleitabschnitte spatially difficult to access areas below the cooking surface can be made accessible. Furthermore, it is also possible to produce optical enclosures by means of the two optical guide sections that are at an angle to one another, which mark a viewer, for example, a cooking zone area.

The emitting region of the lighting elements may be formed by a convex surface or a flat surface of the light guiding section. Especially over flat surfaces can be produced easily recognizable luminous phenomena, which are so in the state The technique is not previously known. To further improve the luminous phenomena, a light-scattering element, for example in the form of a roughening, a coating, in particular an organic or ceramic coating, a scattering element, for example a scattering film, a scattering glass or ceramic on the underside of the cooking surface Platelets or a scattered plastic film. For example, the aforementioned coatings can be formed using: sol-gel materials, silicones, silicone resins, epoxy resins, methacrylates, polyurethane. As ceramic components, (color) pigments or scattering particles can be used. As mentioned above, the light-diffusing element may be or may be an intermediate support. Examples of indirect carriers are glasses, glass ceramics or films, which in turn may be provided with organic and / or ceramic coatings.

The indirect carriers of the light-scattering layer may be either self-adhesive, materially bonded (for example with an adhesive layer) or loosely connected by pressure forces to the underside. In particular, in connection with localized luminous phenomena, which are limited for example by a masking on the Kochflächenunterseite, the light-scattering element causes a widening of the viewing angle (Comparisons FIGS. 16 and 17 ) and a reduction of the parallax shift, which substantially improves the recognition of this luminous appearance to the user. For example, the following materials can be used as scattering materials: Lexan 8B28 (SABIC Innovative Plastics), Macrofol BL / LT (Bayer), Plexiglas SATINICE □ (Röhm), OPALIKA □ Glass (SCHOTT)

In this case, it can also be provided that at least one of the light guide sections is formed as a surface element.

A cooking appliance according to the invention may be such that the mean transmission of the colored cooking surface is> 0.1%, preferably> 0.4%, in each case for at least one, preferably for each of the spectral ranges from 420 to 500 nm, 500 to 550 nm and 550 to 640 nm. In this case, sufficiently bright color impressions in the blue to red spectral range can be produced with the luminous elements through the cooking surface on the display side formed by the cooking surface front side. With an average transmission> 0.4% clearly recognizable and sufficiently bright displays can be realized. In order to avoid an insight into the internal structure of the cooking appliances and to represent an aesthetic, preferably uniformly colored, non-transparent cooking surface, the maximum transmission of the cooking surface should be defined as <50%, preferably <25% at 400 nm - 700 nm Transmission should be in the spectral range of 450-600 nm <8%, preferably <4%. At a maximum transmission <25%, the view is also denied from the outside even in the case of light irradiation.

According to the invention, provision may also be made for an optical compensation filter to be arranged between the upper side of the cooking surface and the luminous element. Such an optical compensation filter shifts the location of the light emitted by the luminous element Leuchterscheinung. When using a colored glass ceramic, the light location is then shifted again when passing through the cooking surface. The optical compensation filter can now be matched to the material of the cooking surface, that ultimately the desired color appearance on the display side of the cooking surface can be generated. In this way, in particular cost-effective lighting elements using, for example, LEDs can be used. As optical compensation filter can be used filter films or suitable filter materials can be coated directly on the underside of the cooking surface or arranged directly in front of the light emitting element / LED or be integrated in the light guide or attached to the light guide. The compensation filter In addition, it may also be such that it produces a scattering effect and thus widening of the viewing angle.

An inventive cooking appliance can also be such that the cooking surface is provided in the region of its top and / or bottom with a coating. The coating may have functional properties, wherein it prevents, for example, in a transparent or semi-transparent cooking surface, a view of the arranged under the cooking surface internals. Additionally or alternatively, the coating can also be used for optical decoration. The coating can also be provided in particular in the region of the lighting elements with recesses, so that it forms a mask.

Cooking surfaces are known from the prior art, which are provided for reasons of strength in the region of its underside with a knob-like or similar structuring. In order to be able to achieve an improved display quality in such cooking surfaces, provision can be made for a filling layer of transparent material to be applied to the underside of the cooking surface at least in partial regions of the emitting surface of the lighting elements. As a result, the scattering effects of the structured underside are reduced or completely eliminated. The filling layer may consist of a transparent or translucent (for example, also scattering) plastic, for example, silicone. To reduce the parts cost, it may also be provided that cooking surfaces are used, which are smooth on its underside, so not structured, in particular not knotted.

In induction cooking appliances, the induction coil may in particular comprise a copper coil including a holder (which is usually made of plastic). In addition, the induction coil may also be assigned a temperature sensor or an electrical or optionally thermal insulation. Within the scope of the invention The cooking appliance can also be equipped with a heating element in the form of an electric radiant heater or with a gas burner. Also conceivable are combination devices with different types of heating in one device. Furthermore, the invention can also be applied to grills or warming appliances, which also form cooking appliances within the scope of the invention.

The luminous element may consist of a light guide, a light guide holder and a light source. The optical waveguide can be formed from soda-lime glass, borosilicate glass, quartz, glass-ceramic or other transparent, in particular highly transparent types of glass. Such materials are preferred when lighting in the hot area of the cooking surface is to be achieved. Depending on the ambient temperature is also a use of transparent or colored plastics, such as Plexiglas, salts or fluids as a light guide conceivable. The light feed into the light guide can usually be done by means of LEDs, which are available as commercially available LEDs in the colors white, blue, red and other colors. Furthermore, RGB LEDs can be used to generate any mixed colors. Instead of RGB LEDs, it may also be provided to use two differently colored LEDs, these LEDs radiating together into the light guide in order to selectively generate a predetermined mixed color. It is also conceivable that differently colored LEDs emit their light from two different locations in the light guide in order to illuminate this in different colors. It is also conceivable to use adapted LEDs, which compensate for a color shift through the colored cooking surface to the effect that the desired color on the cooking surface top is visible. This may be the original color of the LED but also a different color from the original light source. It is also conceivable to set a color filter directly in front of the light source or to design the light element accordingly as a filter. In this case, in particular, the task can be fulfilled, according to which the color shift can be varied, in particular compensated, by the colored cooking surface, whereby, in particular, the original color of the LED is generated again or another color tone is generated selectively.

Figur 1

ein Kochgerät in Seitenansicht und im Teilschnitt in symbolisierter Darstellung

Figur 2

ein Detail eines Kochgerätes mit einem Stützabschnitt und einem daran montierten Leuchtelement in Seitenansicht und im Schnitt,

Figur 3

ein in Figur 2 mit III-III markiertes Schnittdetail

Figur 4

in symbolisierter Darstellung und Seitenansicht eine Teildarstellung eines Kochgerätes,

Figuren 5-8

verschiedene Darstellungen von Leuchtelementen,

Figuren 9a-10e

unterschiedliche Ausgestaltungsvarianten der Zuordnung von Leuchtelementen zu Heizelementen,

Figur 11

in Draufsicht einen Stützabschnitt für ein Kochgerät mit mehreren Heizelementen,

Figur 12

in schematischer Seitenansicht und im Schnitt ein der Figur 11 entnommenes Detail,

Figur 13

einen Stützabschnitt mit einer Vielzahl von Heizelementen,

Figur 14 - 14b

einen Träger für ein Heizelement in verschiedenen Ansichten,

Figur 15

eine rasterförmige Anordnung von Trägern mit Heizelementen und Leuchtelementen,

Figur 16

ein Kochgerät mit einer Maskierung zur Einschränkung des Betrachtungswinkels einer Leuchterscheinung und

Figur 17

das Kochgerät gemäß Fig. 16 mit einem Streuelement zur Erweiterung des Betrachtungswinkels durch Einführen einer lichtstreuenden Ebene auf der Kochflächenunterseite

The invention will be explained in more detail below with reference to exemplary embodiments illustrated in the drawings. Show it:

FIG. 1

a cooking appliance in side view and in partial section in symbolized representation

FIG. 2

a detail of a cooking appliance with a support portion and a light element mounted thereon in side view and in section,

FIG. 3

a in FIG. 2 III-III marked cut detail

FIG. 4

in a symbolized representation and side view a partial representation of a cooking appliance,

Figures 5-8

various representations of luminous elements,

Figures 9a-10e

different design variants of the assignment of luminous elements to heating elements,

FIG. 11

in plan view a support portion for a cooking appliance with a plurality of heating elements,

FIG. 12

in a schematic side view and in section one of FIG. 11 taken detail,

FIG. 13

a support section with a plurality of heating elements,

FIGS. 14-14b

a support for a heating element in different views,

FIG. 15

a grid-shaped arrangement of carriers with heating elements and lighting elements,

FIG. 16

a cooking appliance with a mask to restrict the viewing angle of a light appearance and

FIG. 17

the cooking appliance according to Fig. 16 with a scattering element for extending the viewing angle by introducing a light-scattering plane on the underside of the cooking surface

FIG. 1 shows a cooking surface 10, which is preferably formed as a colored glass ceramic. It has an upper side 11 and a lower side 12. In the region of the underside 12, a coating 13 is applied to the cooking surface 10, which prevents inspection of the arranged in the area behind the bottom 12 of the cooking surface components. The coating 13 has partial interruptions 14, which serve as light passages. Thus, the coating 13 forms a mask. The cooking surface 10 is formed of a transparent glass material or a glass ceramic. It can be colored to achieve a corresponding aesthetic appearance. In this case, the coloring can also be chosen such that a view through the glass ceramic is substantially prevented. Then can be dispensed with the back coating 13. In the area behind the bottom 12 of the cooking surface 10 heating elements 20 are arranged. In the FIG. 1 For example, a heating element 20 having an induction coil 21 is shown. The heating element 20 is mounted on a support portion 42 of a pressing device 40. The support portion 42 is supported via spring elements 41 on a housing 50. present the support portion 42 is supported by means of the spring elements 41 relative to a housing bottom 51 of the housing 50.

On the support portion 42 lighting elements 30 are further mounted. In this case, the lighting elements 30 are arranged so that between the bottom 12 of the cooking surface 10 and the light-emitting element 30, a distance range is formed. Preferably, the distance is selected in the range between 0.2 to 10 mm, preferably in the range of 0.5 to 5 mm, in particular in the range between 0.5 and 2 mm. The lighting elements 30 are positioned so that their emission area 36 is arranged in the region of the interruption 14 of the coating 13. While the left luminous element 30 enters its luminous appearance via the emission area 36 directly into the cooking surface 10, an optical compensation filter and / or an immersion layer 31 is arranged in the right luminous element 30 between the underside 12 of the cooking surface 10 and the luminous element 30. With the optical compensation filter or the immersion layer 31, the luminous appearance of the luminous element 30 can be changed.

The cooking surface 10 is glued edge elastically into a frame or glued with mounting brackets, which are screwed to the housing 50, locked or the like. Are connected. The assignment is made such that the cooking surface 10 is resiliently supported relative to the housing 50. Now, if a shock load on the top 11 of the cooking surface 10 acts, the cooking surface will bend and can swing against the housing. In this transient process, the heating element 20, which is pressed against the bottom 13 of the cooking surface 10, deflected. Since the light-emitting elements 30 are positioned fixedly to the heating element 20 on the support portion 42, they swing back together with the heating element 20 against the bias of the springs 41. In this case, the support portion 42 is adjusted against the spring elements 41 in the direction of the housing depth. Due to the spacing of the luminous elements 30 with respect to the Bottom 13 of the cooking surface 10 and with the deflectable support portion 42 a striking of the bottom 13 is reliably prevented on the light-emitting elements 30. Thus, damage to the lighting elements 30 can be virtually eliminated. According to the invention, the support section 42 may itself have a spring action. In this case, the use of additional springs can be dispensed with.

In FIG. 2 an exemplary embodiment for fixing the luminous element 30 to the support portion 42 is shown. Here, a holder 60 is used, which has a fastening piece 61, which may be formed for example in the form of a printed circuit board. At the attachment piece 61, a holding lug 62 is attached. Furthermore, the attachment piece 61 carries a luminous means 33 of the luminous element 30. The attachment piece 61 is equipped with a contact region which holds an electrical contact for the voltage supply of the luminous element 30 in the region of the underside of the support portion 42. For this purpose, the support portion 42 is provided with an opening 43 through which the attachment piece 61 engages. For fixing the holder 60 to the support portion 42, a connection 63 is provided. For example, the support portion 42 may consist of a sheet metal. The connection 63 may, for example, be a welding, screwing or gluing, with which the holding lug 62 is connected to the surface of the support section 42. The retaining lug 62 forms a receptacle into which a light guide of the luminous element 30 can be inserted. For this purpose, the light guide on a coupling piece 32 which is inserted into the holding lug 62. At the coupling piece 32, a light guide 34 connects. As FIG. 2 can be seen, the Lichtleitabschnitt 34 of the luminous element 30 is formed by a rod-shaped material with a circular cross-section. For example, the luminous element 30 may be a glass rod. The light source 33 couples its light into the coupling piece 32 at the end, from where the light enters the region of the light-conducting section 34. The light-emitting element faces in the region facing the underside 13 of the cooking surface 10 30 its emission area 36 on. Here, the light of the luminous means 33 is coupled out of the light guide section 34. The decoupling can be carried out, for example, by means of suitable measures, for example an etching of the surface of the light-conducting section 34. It is also conceivable to provide scattered light structures on the upper side of the light guide section 34. It is also provided to make the light extraction via a scattering reflection layer on the side facing away from the cooking surface underside of the light guide 30. The scattering reflection layer can be generated by a scattering film or roughening of the light guide surface or printing in the desired portion of the light guide.

FIG. 3 shows two different variants of a holder 60 for fixing a light-emitting element 30. While the attachment piece 61 of the left holder 60 clearly projects beyond the holding lug 62, a flattening 64 is provided on the attachment piece 61 in the right holder 60, so that the holding lug 62 is preferably flush with the Top of the attachment piece 61 closes or only slightly spaced from the top of the attachment piece 61. With the in FIG. 3 shown right variant of a holder 60, the distance between the bottom 12 of the cooking surface 10 and the lighting element 30 can be reduced in favor of improved light output.

FIG. 4 shows a further variant of a holder 60. Here, the basic construction of the holder is again similar to the FIGS. 2 and 3 selected. The holder 60 has again a fastening piece 61 with a connected holding lug 62. The support portion 42 has a fold in the region of the connection 63 to the holding lug 62 can be realized. In the holding lug 62 of the holder 60, a light guide of the light-emitting element 30 in the form of a bent glass rod, plastic rod or a rod made of another transparent material is used. The light guide has two light guide sections arranged at an angle to one another 34, 35, which are merged via an arcuate bend 37 into each other in one piece. While in the design variants according to the FIGS. 2 and 3 the central longitudinal axis of the coupling piece 32 was aligned horizontally is in the FIG. 4 the longitudinal axis of the coupling piece 32 aligned vertically to the cooking surface plane. With this configuration, in particular the lighting means 33 can be kept below the support portion 42, whereby an additional distance to the heating element and a thermal insulation is achieved. As a result, the service life of the luminous means 33 can be increased.

In FIG. 5 is in principle a similar structure as in FIG. 4 shown. Unlike the FIG. 4 is now here no rod-shaped light guide used, but a light guide in the form of an angled plate, for example consisting of glass or plastic. Here are again two Lichtleitabschnitte 34, 35 via an angled portion 37 merged into each other. The light-guiding section 35 forms on its upper side a radiation region 36 in the form of a rectangular or square surface, wherein it too can be structured, depending on the intended scattering or reflection regions.

FIG. 6 shows a light guide of a lighting element 30 in the form of a flat plate, which is set with its coupling piece 32 in the holder 60. The plate forms on its upper side a radiation region 36 over which the light coupled in by the light source is emitted. According to the plate-shaped geometry of the light guide according to FIGS. 5 and 6 is also the holder configured with a correspondingly elongated retaining lug 62. In this case, the holding approach is formed by two parallel spaced-apart surface elements, between which the coupling piece 32 is enclosed. Preferably, a plurality of bulbs are arranged side by side in the direction of the longitudinal extent of the holding lug 62. The bulbs 33 are preferably arranged to each other at the same pitch to achieve a uniform illumination. The equalization of illumination can be improved by attaching a scattering surface on the surface of the light guide facing the light source. The scattering surface can be done by roughening or printing or particularly advantageous by using a special adhesive tape, which is offered by the company 3M as unifomity tape.

The FIGS. 7a to 7i show various embodiments of rod-shaped optical fibers of a luminous element 30 wherein always two mutually angled Lichtleitabschnitte 34, 35 are used, which are connected in one piece via an angled portion 37.

In the embodiment according to Figure 7a a circular cross-section is selected, which allows the light extraction via scattering or reflection region on the side facing away from the cooking surface of the light guide. In the embodiment according to FIG. 7b For this purpose, a light guide with a rectangular or square cross section is selected. FIG. 7c shows a similar cross-sectional configuration of the light guide. The bend 37 is chosen so that the Lichtleitabschnitte 34, 35 are at a low angle to each other. But they can also be arranged parallel to each other. According to the embodiment FIG. 7d is selected a rectangular cross-section for the light guide, wherein the height of the light guide is significantly greater than the width of the light guide. Figure 7e shows an embodiment of a light guide according to FIG. 4 , Figure 7f shows a similar embodiment of a light guide as FIG. 7c only with a round bar cross section. FIG. 7g shows a variant of a cylindrical light guide. FIG. 7h shows a light guide similar to FIG. 7d is designed, but has a lower height. 7i shows a light guide with a curved course.

According to the Figures 7j and 7k are also conceivable light guide according to FIG. 6 are designed. In this case, the extension can vary in the longitudinal direction in order to realize differently long radiation areas 36.

The Figures 7l and 7m show light guide of a luminous element 30 analogous to the embodiment according to FIG. 5 , These illustrations illustrate that in order to vary the geometry of the emission surface, both the extension of the light guide in depth and in width directions can vary.

In the FIGS. 7n to 7p optical fibers of a luminous element 30 are disclosed in which a plurality of Lichtleitabschnitte 34, 35, 38 and 39 are integrally connected to each other. It shows Figure 7n a bow-shaped geometry of the light guide, which is formed by a round rod. FIG. 7o shows a bow-shaped geometry having a rectangular cross-section. 7p shows an optical waveguide design in which a further light-conducting section 39 terminates in the middle region between the two light-guiding sections 34 and 38. In the embodiments according to FIGS. 7n to 7p Illuminants 33 can be provided at the free end regions of the light-conducting sections 34, 38 and 39 in order to couple their light into the light guide.

FIG. 7q shows again, much like FIG. 5 , a plate-shaped light guide, wherein the Lichtleitabschnitt 35 has at its free end a concave geometry 30.1 to visualize an arcuate geometry, for example, the end portion of a heating element 20 can.

FIG. 7r shows a light guide which is formed by a plate-shaped blank and two leg-like Lichtleitabschnitte 34 and 38 which pass over bends 37 in the Lichtleitabschnitt 35. The light-guiding section 35 forms a large-area radiating surface 36.

Figure 7s discloses a light guide having two plate-like Lichtleitabschnitte 34, 35, which merge via a bend 37 into each other. The Lichtleitabschnitte 34, 35 are employed at a slight angle to each other or preferably arranged parallel to each other. Figure 7t discloses a similar variant as FIG. 7r However, wherein a smaller width of the Lichtleitabschnittes 35 is selected so that a correspondingly narrower radiating surface 36 results. Figure 7u shows an embodiment of a light guide of the plate-like Lichtleitabschnitte 34, 35 and 38, which merge via the bends 37 into each other. Preferably, the Lichtleitabschnitte 34, 38 are aligned parallel to each other. The light-guiding section 35 is provided with an opening 30.2, which preferably has a circular configuration in accordance with the geometry of the heating element 20. The breakthrough 30.2 is limited by the geometry edge 30.1.

In the in the Figures 4-7u shown embodiments of optical fibers, the radiation areas 36 are preferably arranged parallel to the bottom 12 of the cooking surface 10. Of course, the radiating surfaces 36 may also be at an angle to the bottom 12 of the cooking surface 10.

FIG. 8 discloses an embodiment of a luminous element 30 with a two-part form of the light guide. In this case, initially an optical waveguide element in angular geometry is formed in one piece by the two light-conducting sections 34 and 35 or the angled section 37. The light guide section 34 is accordingly, for example FIG. 2 attached to a holder 60. The light guide section 35 is now inserted in a holder 70. The holder 70 carries a light guide section 38 designed as a rod profile. The light guide sections 35 and 38 are positioned in the holder 70 so that the light from the light element 33 coming from the light guide section 35 can be coupled into the light guide section 38.

In the FIGS. 9a to 9e different embodiments of the invention are shown. In this case, a circular heating element 22 is symbolized in these representations, to which the emission areas 36 of lighting elements 30 are assigned. FIG. 9a indicates using the light guides FIG. 7i four arcuate radiating regions 36, which surround the heating element 20. FIG. 9b also shows using the light guides FIG. 7i two arcuate radiating regions 36 which surround the heating element 20. FIG. 9c shows four line-shaped radiating regions 36, which surround the heating element 20, wherein the optical fibers according to FIG. 7k be used. FIG. 9d shows four punctiform radiating regions 36 of bulbs 33 according to the use of the light guide according to FIG. 7g are designed. In FIG. 9e a radiation region 36 is shown which can be designed using the light guide according to FIG. 7u.

FIGS. 10a to 10c illustrate that on a support portion 42 a plurality of heating elements 20 may be installed. The support section 42 may be assigned to different emission areas 36 in order to either optically mark the boundary of the support section 42 and / or to optically delimit individual heating elements 20. As FIG. 10a shows not only in plan view circular heating elements 20, but also any other geometries of heating elements 20, for example, oval heating elements 20 can be used. FIG. 10c shows that on a support portion 42 a plurality of rows of heating elements 20 may be installed. FIG. 10d shows the rectangular shape of a mounted on a support portion 42 heating element 20. Bei FIG. 10a be optical fiber according to FIG. 7h or 7e , at FIG. 10b according to FIG. 7k or FIG. 2 , at FIG. 10c according to FIG. 7k or FIG. 2 and at FIG. 10c according to Figure 7m used. In extension of the construction of a light guide according to Figure 7u shows FIG. 10e a light guide in which a plurality of openings 30.2 can be introduced into the light guide 35.

FIG. 11 shows a cooking appliance for a surface induction application, wherein a plurality of induction coils 21 of heating elements 20 are mounted on a support portion 42. As FIG. 12 shows, between the induction coil 21 lighting elements with optical fibers according to FIG. 7g be arranged. Alternatively, according to FIG. 13 also a linear marking of the induction coils 21 with light sources, comprising light guides, for example according to the Figures 7j and 7k be used.

FIG. 14 shows a disc-like carrier 22. This takes, like the Figures 14a and 14b show, an induction coil 21 on. On the carrier 22 projections are formed, which form receptacles 23. In the receptacles 23 bulbs 33 are used, which have a radiating surface 36 directly to form a light-emitting element 36 and, for example, can be designed as LEDs (see FIG. 14b ). Alternatively, the lighting elements 30 according to Figure 14a also a light guide, for example according to FIG. 7g have, in which case in the receptacle 23, a lighting means 33, for example an LED is installed. The carrier 22 may form the support portion 42, on which the spring elements 41 are supported. However, it is also conceivable that a plurality of carriers 22 are installed together with their heating elements 20 on a support portion 42, which is then supported in turn by spring elements 41. Preferably, the carriers 22 are arranged in rows for a vibration-optimized design, wherein particularly preferably the carrier 22 of a row are mounted on a respective common support portion 42 in the form of, for example, a traverse.

FIG. 15 symbolizes such a row-shaped arrangement of the carrier 22 and thus the heating elements 20. Accordingly, could at FIG. 15 three (or more) side by side arranged support portions 42 are used, which are then respectively connected to the housing 50 of the cooking appliance. As the FIGS. 15 and 14 show the images 23 and the lighting elements 30 at the same angular distance α arranged distributed to each other over the circumference of the carrier 22. Preferably, three receptacles 23 are provided, which are arranged offset from each other by 120 °. This way you can, like FIG. 15 shows, achieve a compact assignment of the individual heating elements 20 to each other and it is a uniform illumination of the intermediate regions between the carriers 22 allows. Depending on the coil arrangement, it may also be useful not to equip all three images with light elements for all coils. It is also possible to clip the receptacles 23 to the carrier and not to form it firmly, whereby an even greater variety arises in the arrangement of the light elements.

The Figures 16 and 17 show the cooking appliance according to Fig. 1 in a modified embodiment, wherein for improving the luminous appearance on the underside 12 of the cooking surface 19, a light-scattering element 70, in particular a light-scattering plane in the form of a roughening, organic or ceramic coating, a scattering film, a scattering glass or ceramic plate or a scattering plastic film can be appropriate. The indirect carriers of the light-diffusing layer can either be bonded to the underside 12 with an adhesive layer or self-adhesively or loosely via pressure forces. In particular, in connection with localized luminous phenomena-bounded, for example, by a masking (for example, coating 13 with interruptions 14, see above) on the cooking surface underside 12, the light-scattering plane causes a widening of the viewing angle α 1, α 2 and a reduction of the parallax shift whereby the recognition of this luminous appearance to the user B is substantially improved.

Claims (22)

Cooking appliance having a cooking surface (10), consisting of a glass or glass ceramic material, wherein in the region below the underside (12) of the cooking surface (10) at least one heating element (20) and at least one luminous element (30) are arranged, wherein the heating element ( 20) by means of a spring-acting pressing device (40) directly or indirectly against the underside (12) of the cooking surface (10),
characterized in that
the one or more lighting elements (30) and the at least one heating element (20) on a common support portion (42) of the pressing device (40) are arranged such that they are adjustable at a deflection and / or vibration of the cooking surface (10). Cooking appliance according to claim 1,
characterized in that
at a deflection / oscillation of the cooking surface (10), the distance between the lighting elements (30) and the bottom (12) of the cooking surface does not change. Cooking appliance according to claim 1 or 2,
characterized,
in that at least one spring element (41) acting upon the pressing device (40) can be deflected during an adjustment of the luminous element (30) and the heating element (20) and / or that the support section (42) is resilient. Cooking appliance according to one of claims 1 to 3,
characterized,
in that the luminous element (30) is spring-biased relative to the pressure device (40). Cooking appliance according to one of claims 1 to 4,
characterized,
in that the luminous element (30) is arranged at a distance from the underside (12) of the cooking surface (10), preferably a distance in the range from 0.2 to 10 mm, particularly preferably 0.5 to 5 mm, particularly preferably 0.5 to 2 mm is provided. Cooking appliance according to one of claims 1 to 5,
characterized,
in that the support section (42) carries a plurality of heating elements (20), wherein the heating elements (20) are arranged in at least one row. Cooking appliance according to claim 6,
characterized,
that below the cooking surface (10) a plurality of support portions (42) are arranged, which extend in the width or depth direction of the cooking surface (10). Cooking appliance according to one of claims 1 to 7,
characterized,
in that the support section (42) is part of a carrier (22) which receives the at least one heating element (20) and the at least one luminous element (30). Cooking appliance according to claim 8,
characterized,
that the carrier (22) is formed like a housing or disc-shaped and at least one integrally formed laterally receptacle (23) for the light-emitting element (30). Cooking appliance according to one of claims 8 or 9,
characterized,
in that the heating element (20) and the luminous element (30) are electrified at a common electrical connection of the carrier (22). Cooking appliance according to one of claims 1 to 10,
characterized,
in that the luminous element (30) is arranged between two heating elements (20). Cooking appliance according to one of claims 1 to 11,
characterized,
in that the luminous element (30) has a luminous means (33) and a light guide with at least one light guide section (34) into which the luminous means (33) couples its light, and in that the light guide section (34) and / or a light guide section (34) ) coupled further Lichtleitabschnitt (35, 38, 39) has a radiation region (36) through which the light of the illuminant (33) in the direction of the underside (12) of the cooking surface (10) can be emitted. Cooking appliance according to claim 12,
characterized,
in that the at least two light-conducting sections (34, 35, 38, 39) preferably merge into one another via an angled portion (37). Cooking appliance according to one of claims 12 or 13,
characterized,
in that the emitting region (36) is formed by a convex surface or a flat surface of the light guiding section (34, 35, 38, 39). Cooking appliance according to one of claims 12 to 14,
characterized,
in that at least one of the light guide sections (34, 35, 38, 39) is designed as a surface element. Cooking appliance according to one of claims 1 to 15,
characterized,
that the average transmission of at least a partial area of the stained cooking surface (10) or at least a partial area of one of the cooking surface (10) and at least one coating consisting unit> 0.1% in each case for at least one, preferably for each of the spectral ranges 420-500 nm, 500 to 550 nm and 550 to 640 nm. Cooking appliance according to one of claims 1 to 16,
characterized,
that the average transmission of at least a partial area of the stained cooking surface existing (10) or at least a partial area of one of the cooking surface (10) and at least one coating unit> 0.4% each for at least one, preferably for each of the spectral ranges 420-500 nm , 500 to 550 nm and 550 to 640 nm. Cooking appliance according to one of claims 1 to 17,
characterized,
that the maximum transmission of at least one partial area of the stained cooking surface (10) or at least a partial area of one of the cooking surface (10) and at least one coating consisting unit <50%, preferably <25% in the spectral range from 400 to 750 nm and <8%, preferably <4% in the spectral range from 450 to 600 nm. Cooking appliance according to one of claims 1 to 18,
characterized,
in that an optical compensation filter is arranged between the upper side of the cooking surface (10) and the luminous element (30), and / or that a light-diffusing element (70) is arranged between the luminous element (30) and the upper side (11) of the cooking surface (10) , Cooking appliance according to one of claims 1 to 19,
characterized,
that the cooking surface (10) at their top and / or bottom (11, 12) is provided with a coating. Cooking appliance according to one of claims 1 to 20,
characterized,
that the bottom (12) has a nub-like structure or the like of the cooking surface (10),
and that at least in partial regions of the emission surface (36) a filling layer of transparent material is applied to the underside (12). Cooking appliance according to one of claims 1 to 21,
characterized,
in that the cooling element (s) (30) are in heat-conducting contact with a heat sink, wherein the heat sink is preferably formed by the support section (42), wherein in particular preferably the support section (42) is formed as a metal body, for example as a metal plate.

Images