EP2942569A1 - Hotplate with a hotplate field and light irradiation from the side - Google Patents

Abstract

The invention relates to a hob (1) with a hob plate (2) and a lighting device (14), which has at least one light source (12) arranged such that light (12a) of the light source (12) over a lateral edge (12). 9) of the hob plate (2) can be coupled into the hob plate (2), wherein a light coupling element (16, 17) for coupling the light (12a) into the hob plate (2) has a light source (12) facing coupling surface (11), which is arranged at an angle not equal to 90 ° to a bottom (8) of the hob plate (2).

Description

The invention relates to a hob with a hob plate and a lighting device having at least one light source, which is arranged such that light of the light source can be coupled via a lateral edge of the hob plate in the hob plate.

Such a configuration is for example from the EP 2 381 177 A1 known. In these embodiments, this hob plate is formed of glass ceramic, which is then functionally designed as a light guide. The light sources are spaced therefrom to this narrow lateral edge of the hob plate, and their Hauptabstrahlrichtung is formed perpendicular to the strictly rectilinear vertical contour profile of the edge.

In addition, a hob with a lateral light radiation from the EP 1 376 872 B1 known. There, too, the light of a light source at the narrow edge is coupled into the hob plate and propagates in this under multiple total reflection. This coupled light is totally reflected in it over the entire dimensions of the cooktop panel and reaches a scatter zone, where it is then scattered so that it emerges from a button and thus this button appears bright to the environment. In order to minimize reflection losses at the edge of this hob plate, the light of the light source is directed to the edge as obtuse as possible. On the side facing away from the edge of the light source, a reflective coating is provided by which is to be achieved that the light of the light source enters the cooktop panel as much as possible.

In the known embodiments, the lateral illumination leads to very undefined Lichtausbreitungen in the entire hob plate, which results over these long distances declining brightness to the center of the hob plate out as well as undefined brightness distributions over the entire surface. By these embodiments, uneven brightness zones are perceived, however should appear evenly. Therefore, it is impossible or precluded in the prior art that specific strips can be produced off the center of the hob plate individually and with relatively homogeneous light distribution.

It is an object of the present invention to provide a cooktop in which a locally specified generation of a brightness zone and a more uniform light distribution of such a zone can be achieved with a light coupling over a narrow side edge.

This object is achieved by a hob according to the features of claim 1.

An inventive cooktop comprises a cooktop panel and a lighting device, which has at least one light source. The light source is arranged such that light from this light source can be coupled into the cooktop panel via a lateral edge of the cooktop panel. An essential idea of the invention is to be seen in that the hob has a light coupling element for coupling the light in the hob plate. This light coupling element is designed so that it has a coupling surface facing the light source, which is arranged at an angle not equal to 90 ° to an underside of the hob plate. By means of such a specific embodiment of the hob, a very defined direction specification for the coupled-in light is achievable, so that the local position, in particular edge-side brightness zones, can be generated in a very defined manner. By this configuration is then also achieved that such brightness zones have a very uniform and thus homogeneous light distribution and are therefore perceptible to an observer as a uniform illuminated optical element. As a result, visually displayed information about internal illumination of the hob is presented to a user both locally more precise and with respect to the clear overall visibility of the illuminated area improved.

It is preferably provided that the light coupling element is formed by the hob plate itself and the coupling surface is formed by at least a portion of the extension of the edge. In such a configuration, therefore, the hob plate is provided as an integral part, which on this narrow lateral Edge is formed with said coupling surface and thus this coupling surface is quasi integrated in the region of the hob plate is formed. In this embodiment, therefore, the hob plate itself is to manufacture and design accordingly.

In an alternative embodiment it is provided that the light coupling element is a separate light guide, which is arranged adjacent to the edge of the hob plate. Preferably, it is provided here that this separate light guide is arranged non-destructively non-detachably directly adjacent to this edge. For example, it may be glued to it. However, it can also be provided that a mechanical connection between the light guide and the hob plate is formed such that no additional connecting element is disposed on the contact surfaces on which the light guide and the edge of the cooktop plate directly abut each other. As a result, the optical influence of the light with respect to the deflection is avoided.

By a light coupling element, which is provided as a separate component to the hob plate, the usual shape of the hob plate can be formed and provided so that the manufacturing process of the hob itself does not have to be changed over.

Preferably, the coupling surface is at least partially planar. In this embodiment, then in a longitudinal sectional view of the hob plate then a tapered towards the edge shape achieved or in an embodiment with a separate light guide, which is arranged adjacent to the edge of the hob plate, a side facing away from the edge side also tapered light guide formed ,

In particular, it is provided that the light source is oriented so that the light emitted by it with primary rays at an angle other than 90 ° to the coupling surface impinges. As a result of this embodiment, when the light is coupled in via the coupling surface in a defined manner, a light deflection is achieved, so that the above-mentioned precise local brightness zones, in particular the near-edge brightness zones, are very well defined in the cooktop panel and improved with regard to their uniform brightness appearance can be generated. Preferably, an angle between a straight contour in longitudinal section through the hob plate contour curve of the planar coupling surface and a bottom of the hob plate between 25 ° and 65 °, in particular between 30 ° and 60 °. This specific angular geometry is particularly advantageous for producing brightness zones which already start at the edge of the hob plate and are very narrow in this context. These brightness zones then generated thus do not extend undesirably far into the cooktop panel, so that here too no unwanted loss of brightness and no, as occurs in the prior art, very inhomogeneous brightness distribution occurs in a brightness zone.

In a further embodiment it can be provided that the coupling-in surface is curved at least in regions. This also makes it possible to generate very specific localized locations of brightness zones and, as a rule, very focused and precisely outlined brightness zones, which in turn also have a very uniform light distribution.

Preferably, in such an embodiment, the coupling surface is formed in a longitudinal section of the hob plate with a convex contour profile. In particular, this convex contour profile is formed with an equal radius over the entire length of the contour profile. It is then formed by such a design, so to speak, a kind of converging lens, through which the above advantages come into full effect here as well.

In an advantageous embodiment, the convex contour profile has a radius between 2.5 mm and 6.5 mm, in particular between 3 mm and 6 mm. This also just the beginning of the edge of the cooktop panel and measured perpendicular to this edge very narrow brightness zones are possible, which then appear as a strip with very similar homogeneous light distribution.

In particular, the coupling-in surface is designed such that the coupled-in light is deflected or broken toward the underside of the hob plate. Preferably, therefore, the embodiment of the coupling surface with at least partially planar configuration and / or at least partially curved Design of an underside of the cooktop plate facing away from the cooktop panel itself or formed thereon a light guide. As a result of this design of the specific coupling-in area, the abovementioned specific embodiments of brightness zones, in particular edge-side narrow brightness strips, are achieved in a targeted and defined manner, and this is also made possible with very homogeneous light distribution.

Preferably, the at least one light source is on the side facing away from the edge of the hob plate and covered from above by a cover. As a result, unwanted light leaks can be avoided laterally and upwards and as large a proportion as possible of the emitted light can be conducted to the coupling surface.

It can be provided that the cover is designed to be reflective on the inner side facing the light source. In this context, a specific mirror coating or another, light-reflecting coating may be provided. The embodiment with an otherwise optical element, for example a prism or a lens or a further light guide, may be provided in the context.

Preferably, the illuminating device illuminates a surface area of the cooking field plate adjacent to the edge, wherein the surface area in the surface of the cooking surface plate is formed in a direction perpendicular to the edge at most up to 20% of the extent of the extent of the hob plate in this vertical direction. It is thus defined here a very specific brightness zone, which should be designed as a very narrow edge-side strip. By such brightness zones can be displayed at the edge information about, for example, a cooking zone of the hob plate. By means of a marginal narrow optical strip or such a brightness zone, for example, the selected or already running active operation of a cooking zone can be displayed.

Preferably, the cooktop panel has a thickness of between 3.5 mm and 5 mm, in particular 4 mm. Just this specific thickness of the cooktop panel allows with the above advantageous values for a radius of a curved coupling surface and / or an angular position of a flat coupling surface for Underside of the cooktop panel particularly close to the edges, stripe-shaped brightness zones with a particularly homogeneous light distribution.

It is preferably provided that an underside of the hob plate is coated with a light-impermeable, in particular reflective layer. As a result of this embodiment, the coupled-in light is reflected back to the top at most so that the particularly bright embodiment of a brightness zone with a particularly uniform homogeneous light distribution can be generated. In principle, another embodiment of the hob plate is possible to the effect that it is light-impermeable to the bottom. Thus, in the context, a separate, light-impermeable component may be arranged on the underside of the hob plate.

Further features of the invention will become apparent from the claims, the figures and the description of the figures. The features and feature combinations mentioned above in the description, as well as the features and feature combinations mentioned below in the description of the figures and / or shown alone in the figures, can be used not only in the respectively specified combination but also in other combinations or alone, without the frame to leave the invention. Thus, embodiments of the invention are to be regarded as encompassed and disclosed, which are not explicitly shown and explained in the figures, however, emerge and can be produced by separated combinations of features from the embodiments explained.

Fig. 1

eine Draufsicht auf ein Ausführungsbeispiel eines erfindungsgemäßen Kochfelds;

Fig. 2

eine schematische Längsschnittdarstellung durch ein Ausführungsbeispiel einer Kochfeldplatte des Kochfelds gemäß Fig. 1;

Fig. 3

eine Schnittdarstellung entsprechend der Ansicht in Fig. 2 mit einem dazu unterschiedlichen Ausführungsbeispiel einer Ausgestaltung der Kochfeldplatte;

Fig. 4

eine schematische Schnittdarstellung durch ein erstes Ausführungsbeispiel des Kochfelds gemäß Fig. 1;

Fig. 5

eine schematische Schnittdarstellung durch ein zweites Ausführungsbeispiel des Kochfelds gemäß Fig. 1;

Fig. 6

eine schematische Schnittdarstellung durch ein drittes Ausführungsbeispiel des Kochfelds gemäß Fig. 1;

Fig. 7

eine schematische Schnittdarstellung durch ein viertes Ausführungsbeispiel des Kochfelds gemäß Fig. 1;

Fig. 8

eine Schnittdarstellung durch ein fünftes Ausführungsbeispiel eines Kochfelds gemäß Fig. 1;

Fig. 9

eine schematische Schnittdarstellung durch ein sechstes Ausführungsbeispiel des Kochfelds gemäß Fig. 1; und

Fig. 10

eine schematische Schnittdarstellung durch ein siebtes Ausführungsbeispiel des Kochfelds gemäß Fig. 1.

Embodiments of the invention are explained in more detail below with reference to schematic drawings. Show it:

Fig. 1

a plan view of an embodiment of a cooking hob according to the invention;

Fig. 2

a schematic longitudinal section through an embodiment of a hob plate of the hob according to Fig. 1 ;

Fig. 3

a sectional view corresponding to the view in Fig. 2 with a different embodiment of an embodiment of the hob plate;

Fig. 4

a schematic sectional view through a first embodiment of the hob according to Fig. 1 ;

Fig. 5

a schematic sectional view through a second embodiment of the hob according to Fig. 1 ;

Fig. 6

a schematic sectional view through a third embodiment of the hob according to Fig. 1 ;

Fig. 7

a schematic sectional view through a fourth embodiment of the hob according to Fig. 1 ;

Fig. 8

a sectional view through a fifth embodiment of a hob according to Fig. 1 ;

Fig. 9

a schematic sectional view through a sixth embodiment of the hob according to Fig. 1 ; and

Fig. 10

a schematic sectional view through a seventh embodiment of the hob according to Fig. 1 ,

In the figures, identical or functionally identical elements are provided with the same reference numerals.

In Fig. 1 a hob 1 is shown in a plan view. The hob 1 comprises a hob plate 2, which is formed of glass ceramic or glass. On an upper side 3 of the hob plate 2 are to understand in number, position and geometric configuration, only by way of example, cooking zones 4, 5, 6 and 7 formed or marked. The hob plate 2 has, in addition to the user-facing top 3 an opposite bottom 8 ( Fig. 2 and Fig. 3 ) on. In addition, a top edge 3 and the underside 8 connecting narrow edge 9 is formed circumferentially.

As in the plan view according to Fig. 10 can be seen, the hob plate 2 is also surrounded by a frame 10. The frame 10 covers components disposed thereunder, such as light sources of a lighting device.

In Fig. 2 is in a schematic longitudinal section and thus in a sectional plane, the in Fig. 1 is perpendicular to the plane of the figure, the hob plate 2 shown. The edge 9 has in this embodiment, a coupling-in surface 11 for coupling light of the lighting device, which is flat. This means that in this longitudinal sectional view, this coupling-in surface 11 has a straight contours. In particular, it is provided that an angle α between the coupling surface 11 and the underside 8 is between 25 ° and 65 °, in particular between 30 ° and 60 °. As can be seen, in this embodiment, the coupling surface 11 is not formed over the entire height between the top 3 and the bottom 8, but partially formed over the entire extent of the edge 9. However, it can also be provided that this bevel is formed with respect to the coupling surface 11 over the entire connecting path between the top 3 and the bottom 8.

In the embodiment shown, the coupling surface 11 of the bottom 8 is formed facing away.

It can be provided that this light coupling element, which has the coupling surface 11, as shown in FIG Fig. 2 quasi integrated into the hob plate 2 and thus formed by itself. However, it can also be provided that a corresponding light coupling element is formed separately from the hob plate 2 and is arranged directly adjacent to the edge 9.

In Fig. 3 is shown in a corresponding longitudinal section a further embodiment of a light coupling element with a coupling surface 11. In this embodiment is in the diversity too Fig. 2 the coupling surface 11 is not flat, but curved. In the longitudinal sectional view, therefore, a coupling-in surface 11 is formed, which has an arc-shaped contour profile, which is designed in particular convex. Preferably, a radius r is formed between 2.5 mm and 6.5 mm, in particular between 3 mm and 6 mm. The radius r is preferably over the entire distance of the coupling surface 11 and thus constant over the entire curved contour profile.

Again, it can be provided that the coupling surface 11 extends with its curved configuration over the entire connecting path between the top 3 and the bottom 8 and not only partially extends from it.

In Fig. 4 is an embodiment of the hob 1 along the section line AA shown in a schematic longitudinal sectional view. For clarity, the in Fig. 4 components shown not provided with cut surfaces, so that the beam path of the light of the light source 12 is easier to understand. As can be seen, in this embodiment, the coupling surface 11 is formed over the entire connecting path between the top 3 and the bottom 8, so that here at the edge 9 a tip or wedge-shaped configuration of the hob plate 2 is formed. It can be seen that an angle α between the edge 9 and thus also the coupling surface 11 and a bottom 8 is an acute angle, which is 30 ° here. The hob 1 is also exemplary mounted on a countertop 13, this being understood merely by way of example and the direct support of the hob plate 2 on the countertop 13 is to be understood as an example. Usually, other components, such as a mounting frame or the like, may be provided here, which then serve as additional carrier components and which then the hob 1 is connected to the worktop 13.

A lighting device 14 preferably comprises a plurality of light sources 12, which may also be light-emitting diodes, for example. They are, as in Fig. 4 to recognize, arranged laterally to the hob plate 2 and also positioned in the vertical direction so that they are within a thickness d, which is preferably 4mm, are arranged and thus virtually arranged at the same altitude. The light source 12 is covered by the frame 10, which is a cover. Both on the hob plate 2 opposite side, as well as up a light leakage is thus prevented. Preferably, it is also provided that an inner side 10 a of the frame 10 is formed reflecting light, in which case a corresponding coating can be provided and / or even with a metallic material, such as stainless steel, a appropriate light reflection is given. As a result, the light emitted by the light source 12 is directed circumferentially to the coupling surface 11.

It can also be provided that the inside 10a is blackened or roughened or otherwise configured so that reflections are prevented as much as possible. This is advantageous if, for example due to the geometry of the inner side 10a and the position of the light source 12 and possibly the coupling surface 11 unfavorable reflections and by the secondary radiation then unfavorable Lichteinkopplung and distribution in the hob plate 2 would occur.

It is preferably provided that a main emission direction 12a of the light 12b with the primary rays arrive at an angle not equal to 90 ° to the coupling surface 11. As a result, the coupled-in light 12c is deflected in a defined manner to the bottom and thus to the underside 8 of the cooktop panel 2. As a result of this configuration, a brightness zone 15 (directly adjacent to the edge 9) is achieved (FIG. Fig. 1 ) can be generated, which then considered in a direction perpendicular to the edge 9 and in the surface of the hob plate 2 and thus in Fig. 1 can be generated very narrow in the x direction. Like this in Fig. 1 is shown by way of example, thus arise at the edge of very narrow brightness zones, which can then make at least one active or selected state of one of the cooking zones 4 to 7 optically identified in the embodiment. For this purpose, 4 to 7 individual brightness zones 15, 16, 17 and 18 are provided for each of the cooking zones. On the one hand, it is therefore possible with this embodiment to produce corresponding strip-shaped and, in the expansion in the x-direction, very narrow brightness zones 15 to 18 already beginning at the edge 9, which then also appear in each case with a very homogeneous light distribution.

As in Fig. 4 Moreover, it is also shown that light, which arrive as primary beams at the coupling surface 11 from the light source 12, is reflected, so that corresponding secondary beams 12d are formed, which are then reflected, for example, on the inside 10a and then again as secondary beams into the cooking field plate 2 be coupled via the coupling surface 11.

In Fig. 5 is a sectional view analogous to Fig. 4 shown, in which, in contrast to the representation in Fig. 4 only the angle α is different and here is 45 °. This angular magnification also changes the deflection of the incident light at the coupling-in surface 11, as a result of which the extension of the brightness zone 15 in the x-direction also changes and, in particular, widens.

In Fig. 6 a further embodiment is shown in which, unlike 4 and FIG. 5 the angle α is 60 °. As can be seen from the progress of the light beams, the width of the brightness zone 15 in the x-direction is thereby further widened.

Preferably, it is provided that this width of the brightness zones, and in the examples mentioned, the brightness zone 15, in the width direction of the hob plate 2 and thus in the x direction, in the surface of the hob plate 2 perpendicular to the edge 9, via which the light is also coupled is oriented, a maximum of 20% of the total extent or the entire extent of the hob plate 2 is in this vertical direction.

In Fig. 7 is in a further sectional view according to the statements in Fig. 4 to Fig. 6 the hob 1 shown. In contrast to the statements according to Fig. 4 to Fig. 6 is provided here that a light coupling element is not integrated in the hob plate 2, but is formed by a separate light guide. In contrast, in contrast to the light coupling elements 16, as shown in the Fig. 4 to Fig. 6 are represented, formed by this separate light guide, a separate Lichteinkoppelelement 17, which rests directly on the edge 9 of the hob plate 2. On the side facing away from the edge 9 and thus the light source 12 side facing this Lichteinkoppelelement 17 then has a configuration which comprises a coupling surface 11, which in turn is arranged at an angle not equal to 90 ° to a bottom 8 of the hob plate 2. In the embodiment in Fig. 7 is this coupling surface 11 according to the comments in 4 to 6 formed and thus formed as a straight contour contour in the longitudinal sectional view, which then extends in particular over the entire connecting path between an upper side and a lower side of the Lichteinkoppelelements 17, said Lichteinkoppelelement 17 extends in the vertical direction and thus in the z-direction over the same height or has the same thickness as the hob plate 2 with its thickness d.

Also in this embodiment according to Fig. 7 For example, the coupling-in surface 11 can be designed differently and, for example, have a contours profile which is curved at least in regions in the longitudinal section, so that in particular a converging lens is formed.

Curved contours of the coupling surface 11 are in accordance with the following explanatory embodiments Fig. 8 to Fig. 10 shown. So is in the context in the illustration according to Fig. 8 a longitudinal sectional view shown with respect to the components and their arrangement according to the embodiments according to Fig. 4 to Fig. 7 are formed. Difference to the statements there is here that the coupling surface 11 is convexly curved and in Fig. 8 not over the entire connecting distance between the top 3 and the bottom 8 of the hob plate 2 extends. Again, the thickness d is again preferably 4 mm, and the radius r is in the embodiment in FIG Fig. 8 preferably 3mm. In Fig. 9 an embodiment is shown in which the coupling surface 11 is curved over the entire connecting path between the top 3 and the bottom 8 and in the context of a radius r of 4mm is formed.

Again, unlike that, in Fig. 10 an embodiment shown in which the radius r is 6mm.

LIST OF REFERENCE NUMBERS

1

hob

2

Hotplate

3

top

4, 5, 6, 7

cooking zones

8th

bottom

9

edge

10

frame

10a

inside

11

coupling surface

12

light source

12a

main radiation

12b

light

12c

light

13

countertop

14

lighting device

15, 16, 17, 18

brightness zones

α

angle

d

thickness

r

radius

Claims (14)

Hob (1) with a hob plate (2) and a lighting device (14), which has at least one light source (12) arranged such that light (12a) of the light source (12) via a side edge (9) of the hob plate (2) in the cooking field plate (2) can be coupled, characterized in that a light coupling element (16, 17) for coupling the light (12a) in the cooking field plate (2) one of the light source (12) facing coupling surface (11) which is arranged at an angle not equal to 90 ° to a bottom (8) of the hob plate (2). Hob (1) according to claim 1, characterized in that the light coupling element (16) through the hob plate (2) itself is formed and the coupling surface (11) by at least a portion of the extension of the edge (9) is formed. Hob (1) according to claim 1, characterized in that the Lichteinkoppelelement (17) is a separate light guide, which is arranged adjacent to the edge (9). Hob (1) according to one of the preceding claims, characterized in that the coupling surface (11) is at least partially planar. Hob according to claim 4, characterized in that an angle (α) between a longitudinal section through the hob plate (2) straight contour profile of the coupling surface (11) and the bottom (8) between 25 ° and 65 °, in particular between 30 ° and 60 °, is. Hob (1) according to any one of the preceding claims, characterized in that the coupling surface (11) is curved at least partially. Hob (1) according to claim 6, characterized in that the coupling surface (11) in the longitudinal section of the hob plate (2) has a convex contour curve, in particular a convex contour profile with an equal radius (r) over the entire length of the contour curve. Hob (1) according to claim 7, characterized in that the convex contour profile has a radius (r) between 2.5 mm and 6.5 mm, in particular between 3 mm and 6 mm. Hob (1) according to one of the preceding claims, characterized in that the coupling surface (11) is formed such that the injected light to the bottom (8) of the hob plate (1) is broken down. Hob (1) according to one of the preceding claims, characterized in that the light source (12) is covered on the edge (9) of the hob plate (2) facing away from the top and by a cover (10). Hob (1) according to claim 10, characterized in that the cover (10) on the light source (12) facing the inside (10a) is designed to be reflective light. Hob (1) according to one of the preceding claims, characterized in that a surface area (15 to 18) of the hob plate (2) adjoining the edge (9) is illuminated by the lighting device (14), the surface area (15 to 18) being illuminated. in the surface of the hob plate (2) viewed in a direction perpendicular to the edge (9) a maximum of up to 20% of the extent of the extent of the hob plate (2) is formed in this vertical direction. Hob (1) according to one of the preceding claims, characterized in that the hob plate (2) has a thickness (d) between 3.5 mm and 5 mm, in particular 4 mm. Hob (1) according to one of the preceding claims, characterized in that a bottom (8) of the hob plate (2) is coated with a light-impermeable, in particular reflective layer.

Images