EP3938860A2

EP3938860A2 - Operating device for a domestic appliance having an optically displayed placing zone for an operating element separate therefrom, and domestic appliance

Info

Publication number: EP3938860A2
Application number: EP20710122.1A
Authority: EP
Inventors: René Alt; Thomas Eric Beliveau; Sabine HARRER; Lukas Methner; Torsten Popp; Tobias Schmidt; Katja SCHÖNFUSS; Frank Schumacher
Original assignee: BSH Hausgeraete GmbH
Current assignee: BSH Hausgeraete GmbH
Priority date: 2019-03-11
Filing date: 2020-03-06
Publication date: 2022-01-19
Also published as: CN113508263A; CN113508263B; WO2020182654A2; DE102019203256A1; WO2020182654A3

Abstract

One aspect relates to an operating device (8) for a domestic appliance (1), having an operating element (9) and an operating element holder (11) separate therefrom, on which holder the operating element (9) can be placed and from which the operating element can be removed in a non-destructive and releasable manner, wherein when the operating element (9) is placed on the operating element holder (11), operating conditions of the domestic appliance (1) can be set by actuating the operating element (9), the operating element (9) being placed at a defined local placing zone (12) of the operating element holder (11) for this purpose, the operating device (8) having an illumination device (13) with which, when the illumination device (13) is activated, the placing zone (12) is made recognisable locally at the operating element holder (11) and/or geometrically. Further aspects relate to a domestic appliance (1) and a method.

Description

Control device for a household appliance with an optically displayed contact zone for a separate control element and household appliance

One aspect of the invention relates to an operating device for a household appliance. The operating device has an operating element and a separate one

Control element holder on. The operating element can be releasably placed and removed on this operating element receptacle in a non-destructive manner. When the

Control element on the control element holder are operating conditions of the

Household appliance adjustable by pressing the control element. In addition this is

Control element arranged placed on the control element holder in a defined local touchdown zone. Another aspect of the invention relates to a household appliance, in particular a cooking appliance, with an operating device.

Operating devices for such household appliances, in which such a separate operating element is present, are well known. Such operating elements can be designed, for example, like a disc or a flat cylinder. It is known in this context that such separate operating elements can be placed on a specific touch-down zone, which is defined by the arrangement of the other components of the control device, and only have functional interaction with these components of the control device in this specific touch-down zone. For example, it is provided that such operating elements are then held in this contact zone by means of a magnetic holding force and can be rotated about an axis of rotation and / or tilted about this axis of rotation in order to set operating conditions. Such operating devices are known, for example, for hobs.

Such an operating device is known from DE 10 2010 044 146 A1. There it is provided that a separate control element in a recess that the

Has control element receptacle, is arranged and can be released without destruction. When this operating element is placed on the operating element receptacle, the operating element can set operating conditions of the household appliance by means of a relative rocking movement in the trough. There is also provided that adjacent to Recording optical display areas are formed on an upper side, through which a selection of a functional sub-unit of the household appliance and / or a selected function of the household appliance can be displayed optically depending on an actuation of the operating element in the form of a rocking movement and / or a rotary movement in the recording. It is therefore provided there that such a design of optical display areas only indicates operating conditions that have been set.

It is the object of the present invention to create an operating device in which the touchdown zone for a user, on which such a separate

Control element can be attached, is easier to see.

This object is achieved by an operating device and a household appliance according to the independent claims.

One aspect of the invention relates to an operating device for a household appliance. The operating device has an operating element. In addition, the

Control device on a control element holder separate from the control element. The operating element can be releasably placed and removed on this operating element receptacle in a non-destructive manner. When the control element is placed on the

Operating element receptacle, operating conditions of the household appliance can be set by actuating the operating element. For this purpose, the control element is placed on a defined local contact zone of the control element holder. The operating element receptacle has a lighting device with which the touchdown zone in the activated state of the lighting device is identified locally on the operating element receptacle and / or geometrically on the operating element receptacle or is indicated optically. It is thus possible that precisely with such operating devices in which operating elements can be detached from the operating element receptacle in a non-destructive manner and can thus be reversibly removed and replaced, are improved to the effect that this defined contact zone can be more easily recognized by a user. It is thus improved allows that one

Operating element in the removed state can be applied safely and precisely and thus quickly to the correct location on the operating element receptacle, namely at this predetermined contact zone. Namely by making this touchdown zone optically is identified, a user can quickly and easily see where to place the removed control element so that it is correctly positioned where it must be attached in order to then be able to set operating conditions in this position by actuating the control element.

It is preferably provided that an outer surface boundary of the touchdown zone is made visually recognizable as a line at least in some areas by the lighting device. Such a configuration makes this touchdown zone recognizable in a particularly intuitive manner. Both in terms of size and location, in particular with regard to the surface geometry, a user can then easily and reliably recognize where this touchdown zone is and where and thus also how he can accurately attach the control element to the control element receptacle with precise location.

It is preferably provided that the surface boundary represents an outer contour of the operating element geometrically and / or in terms of its dimensions. This means that if the outer contour of an operating element is free of corners, for example is oval or circular, then this surface boundary is also represented geometrically accordingly. In addition to or instead of this, the dimensioning of this surface boundary can then also be exactly as large as the actual dimensions of the outer contour.

In particular, a corresponding

Perception situation for a user, since he can recognize an even simpler and safer assignment of where the contact zone is with this geometric and / or individually marked optical display of the touchdown zone and the control element known to him. Since there is

Operating devices can be the case that a large number of information to be displayed optically is displayed, it is even easier and faster to recognize by such a configuration which of these optical displays, in particular if several are active, then actually represents and optically characterizes the touchdown zone.

It is preferably provided that the line, viewed in its geometry plane, is thickened inwards and / or outwards, perpendicular to this line, so that the line is thicker than a boundary line that only represents the surface boundary geometrically and / or with regard to the dimensions of an outer contour of the operating element. If only such a boundary line is shown, it is relatively thin and filigree because it is relatively sharp and to represent this geometry size and / or size size accurately. Since precisely this boundary line is represented as an optically thicker line with this above-mentioned advantageous embodiment, which has a thickening both inwards and outwards, the visual presentation and thus the perceptibility can be improved. A particular advantage of this embodiment can be seen in the fact that with a possibly also certain asymmetrical placement of the operating element on the placement zone, a perception of this optical surface delimitation is then nevertheless possible when viewed appropriately by a user. Since, in particular, a line that is thickened outwards and thus possibly radially outwards is optically formed and displayed, a complete covering of this optical display by the control element can be avoided even with a certain asymmetrical positioning of the control element on the touch-down zone, and also in the already attached state of the operating element on the touchdown zone continues to be perceived such a visual display.

In particular, this configuration then also makes it possible that even when the operating element is in the attached state on the touchdown zone, this optical

Identification of the geometry and / or the local position of the touchdown zone continues. In particular, this also enables additional lighting of the operating element from behind or from the operating element side in the attached state. This also allows individual

Lighting scenarios for the control element itself result. In particular, it is thus also possible that different position states and / or operating states of the operating element in the state placed on the touchdown zone are additionally made visually recognizable. In addition, this configuration also makes it possible for background lighting or ambient light that irradiates the operating element from behind to be generated. In particular, it is therefore also possible that the operating element in the attached state gives a corona-like light image by this optical position light, which makes the touchdown zone visually recognizable, when the control element is attached in the touchdown zone.

In an advantageous embodiment, it is provided that an area boundary is a circular line which is made optically recognizable at least in certain areas. In particular this is then the case when the control element itself has a corner-free, in particular round, in particular circular, outer contour.

In principle, the outer contour of the operating element can also be designed differently and be designed with corners. For example, a

Triangular geometry or a square geometry or a polygonal geometry can be designed.

The operating element is designed in particular as a flat body. This means that it extends in a direction which is oriented perpendicular to the operating element receptacle and thus in a direction of a longitudinal axis of the operating element with smaller dimensions than in a plane which is oriented perpendicular to this longitudinal axis.

For example, the operating element can be designed as a flat cylinder or disk-like. A flat cuboid or other flat angular body, which has the outer contour with these corners in this plane perpendicular to the longitudinal axis, can also be designed accordingly.

It can be provided that the circular line is designed as a semicircle. In particular, it can be provided that two different contact zones are formed on the control element receptacle. These can be arranged relative to one another in such a way that the one touchdown zone, which is visually identified with a first semicircle, is oriented with a curvature that faces away from the other touchdown zone and is thus designed with a concave curvature in this regard. The further touchdown zone can be visually identified with a further semicircle, which advantageously faces away from the first touchdown zone and is thus concave in this regard. In this embodiment, this results in in particular two separate semicircles which are arranged at a distance from one another and which are curved in opposite directions and are thus quasi semicircles which, in the assembled state, result in a full circle. In particular, a visual display of

Shown touchdown positions, the respective semicircles being two halves of a full circle, which are formed in that a full circle is symmetrically separated and these two semicircles are then separated from one another. A screen can also be arranged between the two semicircles. The operating element can cover part of the screen, in particular an edge area thereof, when it is placed on the operating element receptacle. In a further advantageous embodiment it can be provided that a full circle is formed as the surface boundary. The full circle is in particular designed to run around without interruption.

In an advantageous embodiment it is provided that the lighting device has light sources which are arranged behind a cover of the operating element receptacle and shine light through a transparent area in the cover in order to visually display or identify the touchdown zone. This enables very direct illumination of the control element receptacle and a very short light path from the light source to the one to be displayed

Touch zone enables. Here, too, very precise and exact photos can be generated.

It is preferably provided that the lighting device has a diffuser with which the light from the light source is diffusely scattered. A very homogeneous light distribution can thus be achieved.

In a further embodiment, the lighting device is formed from a combination of the light sources with a screen, which is geometrically

coherent light pattern make the touchdown zone visually recognizable. A full circle is preferably formed by two semicircles, of which a first semicircle is made visually recognizable by the light sources and a second semicircle by a screen display. A screen is to be understood as a matrix-like display, e.g. an LCD, OLED or TFT display. The display can also be designed as a so-called touchscreen.

Provision is preferably made for the lighting device to be activated by the touchdown zone when the operating element is removed in order to make this touchdown zone visually recognizable. In particular, this is advantageous in that a user can easily and quickly recognize where he has to place the removed operating element on the operating element receptacle. In particular, the control element receptacle is designed with a front plate or cover, which is designed in particular such that it is designed essentially opaque. Is this design the

Control element holder also to the effect that the front side has a very tidy visual appearance and thus little or no permanent information is displayed, the touchdown zone can be very difficult to recognize or guess for a user in the deactivated state.

In particular, in such configurations, optical

Identifying the touchdown zone, the respective position can be recognized very easily. Especially when such a control element receptacle is formed from a darker glass material or from other materials that are coated accordingly, so that the opacity in the deactivated state of light sources

Operating device is given, and / or another permanent application, such as printing or the like, this is a very advantageous embodiment in order to easily and quickly identify the touchdown zone.

It is preferably provided that the touchdown zone is visually identified in the removed state of the operating element from this touchdown zone in a first color and the touchdown zone in the attached state of the operating element on the

The touchdown zone is visually identified in a second color different from the first color. This also allows different scenarios to be represented, which on the one hand not only identify the touchdown zone as such, but also clearly signal the respective state of the operating element, namely the attached or removed state. This can be of advantage if a user is, for example, in darker or less illuminated rooms and / or is somewhat distant from the household appliance and in this regard it cannot be clearly recognized whether the control element is attached or removed. This can then be recognized quickly and easily through these individual colors of the touchdown zone.

In addition to or instead of this, this is also made possible to the effect that the touchdown zone in the removed state of the operating element is made visually recognizable from the touchdown zone in a first light intensity and the touchdown zone in the attached state of the control element on the touchdown zone in a light intensity equal to the first different second light intensity is made visible. The light intensities are both greater than zero.

It can also be provided that the operating device has a further

Has lighting device, by means of which operating states of the

Control element and / or corresponding operating condition settings of the household appliance is displayed optically. Such a lighting device can be at least partially formed in the control element itself or at least partially in the control element receptacle.

The touchdown zone can be a flat area of the control element holder, but can also be a trough.

Another aspect of the invention relates to a household appliance with an operating device according to the above aspect or an advantageous embodiment thereof. The household appliance is in particular a cooking appliance. It can be a hob or, for example, an oven. It is also possible that the household appliance is also a fully automatic coffee machine or a dishwasher or a washing machine or a tumble dryer. The household appliance can also be an extractor hood.

With information such as "top", "bottom", "front", "back", "horizontal", "vertical", "depth direction", "width direction", "height direction" and the like are those with intended use and intended arrangement of the control device or given positions and orientations of the household appliance.

The features and combinations of features mentioned above in the description as well as the features and combinations of features mentioned below in the description of the figures and / or shown alone in the figures are not only in the specified combination, but also in other combinations or in

Can be used on its own without departing from the scope of the invention. There are thus also embodiments to be regarded as encompassed and disclosed by the invention, which are not explicitly shown or explained in the figures, but are separated

Combinations of features emerge from the explanations explained and can be generated. There are thus also designs and combinations of features as disclosed which do not have all the features of an originally formulated independent claim. There are also versions and

Combinations of features, in particular through the statements set out above, are to be regarded as disclosed which go beyond the combinations of features set forth in the back-references of the claims or differ from them.

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

Fig. 1 is a schematic representation of an embodiment of a

household appliance according to the invention with an embodiment of an operating device according to the invention;

2 shows a schematic illustration of an optical display of a touchdown zone for an operating element of the operating device;

3 shows a schematic representation of a further exemplary embodiment of a

4 shows a schematic illustration of a further exemplary embodiment of a

Operating device with two touch-down zones, which are represented by respective individual visual identification;

5 shows a schematic illustration of an exemplary embodiment of a

Operating device with several separate contact zones for an operating element, which are visually identified; and

6 shows a schematic sectional illustration through an exemplary embodiment of a

operating device according to the invention.

In the figures, elements that are the same or have the same function are used with the same

Provided with reference numerals. ok

In FIG. 1, a household appliance 1 is shown, which here is a cooking appliance, in particular a hob 2. The hob 2 has a hob plate 3 made of glass or

Glass ceramic can be formed. Cooking zones 4, 5, 6 and 7 are formed on the hob plate 3 in terms of number, shape and position only by way of example. Preparation vessels can be set up on these cooking zones 4 to 7 in order to be able to prepare foodstuffs introduced therein. For this purpose, heating units are provided which are part of the hob 2 and which are arranged below the hob plate 3 and which emit heating energy in the area of the cooking zones 4 to 7.

The hob 2 also has an operating device 8. The operating device 8 has an operating element 9. The control element 9 is a separate component.

The operating element 9 can be designed, for example, like a disc or a flat cylinder. In this context, it has a corner-free outer contour or peripheral contour. The operating element 9 has a longitudinal axis A. The dimensions of the operating element 9 in the direction of this longitudinal axis A are smaller than in a plane which is oriented perpendicular to this longitudinal axis A. This results in the flat state of this operating element 9. The outer contour 10 of this

Operating element 9 is viewed in this plane perpendicular to longitudinal axis A and viewed circumferentially about longitudinal axis A.

The operating device 8 also has an operating element receptacle 11. The control element receptacle 11 is formed in the hob plate 3 in the exemplary embodiment shown. In particular, the control element receptacle 11 can be integrated into the hob plate 3. In this regard, the control element holder 11 is designed as a plate. The control element receptacle 11 is provided so that the control element 9 can be placed on it and removed again in a non-destructive manner. It is provided that when the operating element 9 is placed on the operating element receptacle 11, in particular only then, operating conditions of the hob 2 can be set. For example, a rotary movement of the operating element 9 about the longitudinal axis A and / or a tilting movement to this axis A can take place. These movements of the operating element 9 then take place relative to the stationary one

Control element receptacle 11. For example, a selection of a cooking zone 4 to 7 and a setting of a cooking level of these cooking zones 4 to 7 can take place as operating conditions. The control element receptacle 11 has a predetermined and unchangeable one

Touchdown zone 12, which is provided in a defined manner in order to be able to place the operating element 9 thereon. This means that only when the operating element 9 is placed on this contact zone 12, the full functionality is given and the setting of the operating conditions by pressing the then placed

Control element 9 is enabled.

The operating device 8 also has a lighting device 13. This is arranged in particular below the operating element receptacle 11, in particular below the hob plate 3. It is designed and arranged to make the touchdown zone 12 locally defined on the control element holder 11 and / or geometrically on the control element holder 11 identifiable or to display it optically. This ensures that even when the

Operating element 9 easily and quickly the exact location and / or geometry of the

Touchdown zone 12 can be recognized on the control element holder 11.

It can be provided that the touchdown zone 12 is made optically identifiable to the effect that an outer surface boundary 14 of this touchdown zone 12 is optically identified by the lighting device 13, at least in some areas.

In particular, a line 15 can be optically displayed as this outer surface boundary 14 of the touchdown zone 12 in this context.

It can be provided that this surface boundary 14 also represents an outer contour 10 of the operating element 9 geometrically and / or with regard to the dimensions. This means that this surface boundary 14 can have such a contour as the

Has outer contour 10 and / or also the size of this surface boundary 14

is shown according to the size of the outer contour 10. In this way, not only is the touchdown zone 12 itself visually identified, but also a certain geometry and size of the outer contour 10 identified, in particular even though the operating element 9 has not yet been placed on the operating element receptacle 11. In Fig. 2, an optical display of the touchdown zone 12 is shown in a simplified representation. A full circle 16 is shown here, which is shown closed all round. In this context, it is possible for the surface boundary 14 of the touchdown zone 12 to be indicated by a fine, filigree boundary line 17 as a visual display. This

Boundary line 17 can, for example, correspond to that which represents the outer contour 10 of the operating element 9 geometrically and in terms of dimensions.

It can also be provided that not only this border line 17, but instead a thickened line 18 is shown. This line 18 is formed in a plane in which this full circle 16 extends, radially outwardly and / or radially inwardly thickened compared to this boundary line 17. In this exemplary embodiment, therefore, it is not a very thin, filigree line in the form of the boundary line 17, but one

in this regard, a thicker line is visually indicated. This also makes it possible, in particular, for the optically displayed touchdown zone 12 to be further recognized when the control element 9 is placed on the control element receptacle 11.

In particular when the line 18 is thickened or widened radially outwards with respect to the boundary line 17. In particular is then also with one

Slightly asymmetrical placement of the operating element 9 on the placement zone 12 forms and recognizes a still completely encircling light ring, which then also makes the placement zone 12 optically recognizable.

In Fig. 3, a household appliance 1 is shown in a further embodiment, which is designed here as an oven 19. This has a housing 20. In this

Housing 20 is a not shown cooking space in which food can be prepared. This cooking space can be closed with a door 21 on the front.

In particular, this oven 19 has an operating panel 22 on which an operating device 8 is formed. This operating device 8 can according to the

Operating device 8, as it was explained with reference to FIGS. 1 and 2, be designed. The explanation in this regard, as was given in relation to FIGS. 1 and 2 for the operating device 8, is also provided and made possible in the embodiment in FIG. 3. However, since the control element receptacle 11 is not oriented horizontally here, as is the case in FIG. 1, but is oriented vertically, the mounting of the separate control element 9 should be mentioned. As in the embodiment in FIG. 1, it can be provided by magnetic holding forces. This is in the control element holder 11 and / or behind the control panel 22 is arranged at least one magnet which interacts with a magnet in the control element 9 in order to generate the magnetic holding forces.

The same can also be provided in the embodiment in FIG. 1, in which a holding magnet can then be arranged in the operating element receptacle 11 or in the hob plate 3 or below.

In Fig. 4, a further exemplary embodiment of a control element receptacle 11 is shown in a schematic representation. Two separate contact zones 12 are shown here in an exemplary embodiment. Each of these contact zones 12 is designed for placing an operating element 9. It can be seen here that the left touchdown zone 12 is only partially identified in its outer surface boundary, namely with a partial circle, in particular a semicircle 23, which is optically identified by the lighting device 13. The curvature of this semicircle 23 is such that it faces away from the other touchdown zone 12 arranged on the right. The curvature of this semicircle 23 is concave in this regard. It can also be provided that the right touchdown zone 12 is partially made visually recognizable by an outer surface boundary. In particular, a pitch circle 24, in particular a semicircle, is also provided here. This has a curvature that faces away from the left touchdown zone 12, in this regard also has a concave curvature. A screen (not shown) is preferably arranged between the pitch circle 23 and the pitch circle 24 directly adjacent. If the operating element 9 is placed on the operating element receptacle 11, the screen is partially covered by this. The partial circle 23 and the partial circle 24 can each be added to a full circle via the screen.

In FIG. 5, an exemplary embodiment of a further operating device 8 is shown in a schematic representation, which has several contact zones 12. One or more operating elements 9 can thus be placed on these different contact zones 12. These contact zones 12 are also identified locally and / or geometrically, with reference to the exemplary embodiments already explained for FIGS. 1 to 4.

It can not only be provided in this exemplary embodiment that further optical display areas 25 are additionally and separately provided adjacent to these contact zones 12 and to these optically displayed surface boundaries 14, in particular on the control element receptacle 11. An optical display area 25 can be designed as a screen, for example. The touchdown zone 12 and display area 25 can also be arranged so as to overlap. On this further optical

Display areas 25 can be used to visually display information about the operating states of the household appliance 1. In particular, the household appliance 1 has a

Lighting device 26 on.

In Fig. 6 is a simplified representation of an embodiment of a

Operating device 8 shown, only partial components being shown here.

In this regard, a sectional view is shown in which a

Control element holder 11 is shown. A circuit board 27, on which at least one light source 28, for example a light-emitting diode, is arranged, is arranged behind the operating element receptacle 11. In particular, it is provided that a plurality of light sources 28 are provided, which are arranged in such a way that they display the respective light image to be generated to identify the local geometric configuration of the contact zone 12 on the operating element receptacle 11. For example, the light sources 28 can be arranged as a semicircle or full circle in order to be able to display the light images according to FIG. 4 or according to FIG. 2, for example. For example, the board 27 can also be designed as a semicircle or full circle in this regard. A full circle can e.g. can also be generated in that the light source (s) 28 and a screen (not shown) overlapping the touchdown zone 12 each form a segment of a circle, which together form the full circle. The circle segment displayed on the screen corresponds in terms of color and basic geometric shape

largely that light image which is generated by the light source (s) 28.

In particular, it is provided that the operating device 8 has a diffuser 29 with regard to its configuration with the lighting device 13. The light from the light sources 28 can be scattered with the diffuser 29, so that the light image generated with it is very homogeneous for the local and geometric representation of the touchdown zone 12. The diffuser 29 can be arranged, for example, on a rear side of the operating element receptacle 11, which is designed as a plate or cover.

It is also possible that the touchdown zone 12 in the removed state of the

Operating element 9 of this touchdown zone 12 is visually recognizable in a first color is made and the touchdown zone 12, when the operating element 9 is placed on the touchdown zone 12, is made optically recognizable in a second color different from the first color. In addition to or instead of this, it can be provided that the touchdown zone 12 in the removed state of the operating element 9 therefrom

The touchdown zone 12 is visually identified in a first light intensity and the touchdown zone 12 is optically identified in a second light intensity different from the first light intensity when the operating element 9 is placed on the touchdown zone 12. In addition to or instead of this, provision can also be made for the visual identification of the touchdown zone 12 to vary in such a way that, for example, an area boundary of the touchdown zone 12 when the operating element 9 is removed is made optically identifiable by a thicker line that represents this area boundary than when it is attached of the operating element 9. In the attached state of the operating element 9, this surface boundary, in particular the line, can then be visually displayed more thinly. However, exactly the opposite can also be used

Embodiment be provided in which the line is thinner when that

Control element 9 is not arranged on touchdown zone 12 and the line is thicker when control element 9 is placed on touchdown zone 12. It is particularly important that the visual identification of the touchdown zone 12 takes place at least temporarily when the operating element 9 is removed from this touchdown zone 12 so that this touchdown zone 12 is easy for a user to recognize. In particular, this display is given, in particular started, when the household appliance 1 is switched on.

List of reference symbols

1 household appliance

2 hob

3 hob plate

4 cooking zones

5 cooking zone

6 cooking zone

7 cooking zone

8 control device

9 control element

10 outer contour

1 1 Control element holder 12 Contact zone

13 lighting device

14 area boundary

15 line

16 full circle

17 border line

18 line

19 oven

20 housing

21 door

22 Control panel

23 pitch circle

24 pitch circle

25 Display area

26 Lighting equipment

27 circuit board

28 light source

29 diffuser

A longitudinal axis

Claims

1. Operating device (8) for a household appliance (1), with an operating element (9) and a separate operating element receptacle (11) on which the operating element (9) can be placed and removed non-destructively and detachably ) on the control element holder (11)

Operating conditions of the household appliance (1) can be set by actuating the operating element (9), and wherein the operating element (9) is placed on a defined local contact zone (12) of the operating element receptacle (11), characterized in that the operating device (8) has a Has lighting device (13) with which the touchdown zone (12) in the activated state of

Lighting device (13) at least locally, in particular locally and

geometrically, is identified on the control element holder (11).

2. Control device (8) according to claim 1, characterized in that an outer surface boundary (14) of the touchdown zone (12) is at least partially indicated by the lighting device (13) as a line (15).

3. Operating device (8) according to claim 2, characterized in that the

Surface boundary (14) geometrically and / or with respect to the dimensions

Represents the outer contour (10) of the operating element (9).

4. Operating device (8) according to claim 3, characterized in that the line (15) viewed in its geometry plane perpendicular to the line (15) is thickened inward and / or outward, so that the line 15 is thicker than just one the surface boundary (14) geometrically and / or with respect to the dimensions

The boundary line (17) representing the outer contour (10) of the operating element (9).

5. Operating device (8) according to one of the preceding claims 2 to 4, characterized in that an area boundary (14) is a circular line which is at least partially made optically recognizable.

6. Operating device (8) according to claim 5, characterized in that the

Circle line is visually identified as a semicircle or a full circle.

7. Operating device (8) according to one of the preceding claims, characterized

characterized in that the lighting device (13) has light sources (28) which are arranged behind a control element receptacle (11) designed as a cover for this purpose and which shine light through a transparent area in the cover in order to make the contact zone (12) visually recognizable.

8. Operating device (8) according to claim 7, characterized in that the

Lighting device (13) has a diffuser (29) with which the light from the light sources (28) is diffusely scattered.

9. Control device (8) according to claim 7 or 8, characterized in that the lighting device (13) is formed from a combination of the light sources (28) with a screen, which make the touchdown zone (12) visually recognizable by a geometrically coherent light pattern.

10. Operating device (8) according to one of the preceding claims, characterized

characterized in that the lighting device (13) is activated in the removed state of the operating element (9) from the touchdown zone (12) in order to make the touchdown zone (12) visually recognizable.

11. Operating device (8) according to one of the preceding claims, characterized

characterized in that the touchdown zone (12) in the removed state of the operating element (9) is visually identified by the touchdown zone (12) in a first color and the touchdown zone (12) in the attached state of the control element (9) on the touchdown zone (12) is visually identified in a second color different from the first color, and / or the touchdown zone (12) in the

The removed state of the control element (9) from the touchdown zone (12) is visually identified in a first light intensity and the touchdown zone (12) in the mounted state of the control element (9) on the touchdown zone (12) in a second light intensity different from the first light intensity is identified.

12. Operating device (8) according to one of the preceding claims, characterized in that the operating element (9) is designed like a disk and / or the operating element receptacle (11) is designed as a plate.

13. Household appliance (1), in particular cooking appliance (2, 19), with an operating device (8) according to one of the preceding claims.

14. A method for operating an operating device (8) for a household appliance (1), in which an operating element (9) of the operating device (8) on a

Operating element receptacle (11) of the operating device can be placed and removed non-destructively detachable, wherein when the operating element (9) is placed on the operating element receptacle (1 1), operating conditions of the domestic appliance (1) can be set by actuating the operating element (9), characterized in that that for placing the operating element (9) on the operating element receptacle (1 1) a locally fixed contact zone (12) is specified, at least in the assumed state of the

Operating element (9) from the operating element receptacle (11) this touchdown zone () at least locally, in particular locally and geometrically, by a

Lighting device (13) of the operating device (8) on the

Control element holder (11) is made visible.