CN115605643A

CN115605643A - Household appliance with a door unit

Info

Publication number: CN115605643A
Application number: CN202180035718.2A
Authority: CN
Inventors: T·诺伊米勒; S·施密特
Original assignee: BSH Hausgeraete GmbH
Current assignee: BSH Hausgeraete GmbH
Priority date: 2020-05-18
Filing date: 2021-05-05
Publication date: 2023-01-13
Also published as: DE102020207425A1; WO2021233682A1; EP4153806A1

Abstract

The invention relates to a household appliance (1), wherein the household appliance (1) comprises a housing (5) having a receiving container (6) and an opening (11). The household appliance (1) further comprises: a door unit (13), wherein the door unit (13) is provided for closing the opening (11); a viewing window (19) which is arranged in the door unit (13), wherein the viewing window (19) is substantially transparent in order to be able to view the receiving container (6) when the opening (11) is closed; and a projection surface (20), wherein the projection surface (20) is arranged in the region of the viewing window (19), wherein the projection surface (20) can be produced by inkjet printing, so that the viewing window (19) is also substantially transparent.

Description

Household appliance with a door unit

Technical Field

The invention relates to a household appliance according to claim 1, a method according to claim 8 for the same, and a door unit according to claim 14.

Background

In the document DE 10 2012 103 684 A1, a household appliance with a housing is disclosed, which has a projector. The projector is disposed in the housing and projects a projected image onto an outside of the housing. In this case, in particular two optical components are assigned to the projector, which divert the light beam emitted by the projector in such a way that the light beam is guided into the interior of the door element of the household appliance. In this case, the projection is projected onto the inner surface of the viewing window of the door element.

A further top loading washing machine is disclosed in US 2012/0327201 A1. The washing machine includes a cover member, wherein the cover member has a display unit. The UV projection unit is arranged in a deflector-type element which is formed in the rear region of a cover element of the washing machine above the cover element and projects an image onto the cover element.

In order to be able to display the projection image well, the self-adhesive foil is advantageously arranged where the projection image is to be displayed. Such foils, in particular self-adhesive projection foils, are very expensive and are very complex to produce.

Disclosure of Invention

The object of the present invention is therefore to provide a household appliance having a clearly defined and novel projection surface, wherein improved properties with regard to flexibility and cost reduction are to be provided.

The object of the invention is achieved by the features of the independent claims 1, 8 and 14. Further advantageous embodiments of the invention are given in the dependent claims and in the description and the drawings.

According to one aspect of the invention, the object is achieved by a household appliance. The household appliance comprises here: a housing having a receiving receptacle and an opening; a door unit, wherein the door unit is configured to close the opening. The household appliance also has a viewing window which is arranged in the door unit, wherein the viewing window is substantially transparent, so that the receiving container can be viewed when the opening is closed. The household appliance further comprises a projection surface, wherein the projection surface is arranged in the region of the viewing window, wherein the projection surface can be produced by inkjet printing, so that the projection surface is also substantially transparent. In other words, the viewing window also has transparent properties.

A film is applied to the viewing window by ink-jet printing, said film serving as a projection surface. The printing strength of the viewing window is selected such that the viewing window or the printed projection surface remains or is substantially transparent, so that a user can see into the receiving container when closing the opening of the fluid-conducting household appliance. Printing by means of inkjet printers is also cost-effective and can be integrated without problems into production groups in factories.

The household appliance may be a fluid-conducting household appliance, such as a washing machine, a washer-dryer or a laundry dryer or a dishwasher, a fully automatic coffee machine and/or a steam cooker. The household appliance 1 may also be an oven or range or microwave oven or holding drawer or range hood.

Advantageously, the projection surface of the viewing window has at least one film and/or at least one foil and/or consists of glass and/or at least one polymer, wherein the viewing window consists of glass and/or at least one polymer.

The projection surface of the viewing window may be made of the same material as the viewing window. However, it is also conceivable for the projection surface of the observation window to be composed of a different material than the observation window. The projection surface can be integrated into the viewing window, so that the projection surface is formed, for example, at least partially surrounded by the viewing window. However, it is also conceivable for the projection surface to be a separate element which can be fastened to or on the viewing window. It is likewise conceivable for the viewing window to be suitable for use as a projection surface. As already mentioned, the projection surface can also be at least one film, which is applied to the viewing window.

Preferably, the intensity of the ink coating applied onto the projection surface by inkjet printing corresponds substantially to less than 50% of the maximum possible intensity of the inkjet-printed ink coating.

Each printer has different characteristics or different printing characteristics. This means that the maximum intensity that the printer can print can be different for different printers. However, it is known to the person skilled in the art that the more ink is applied, i.e. the higher the printing intensity, the lower the transparency of the printed side. The better the projection quality, however, the higher the intensity of the ink coating. In the case of each printing press, it must be noted that the intensity must be set to be less than the maximum intensity in order to maintain the transparency properties of the projection surface and thus of the viewing window when the projection surface is printed.

The ink-jet printing preferably comprises at least one light-colored ink which can be applied to the projection surface. The printed projection surface can also be kept transparent by means of a light ink, so that the user can see into the receiving container when the opening of the household appliance is closed.

The light-colored inks preferably comprise different inks, wherein the light-colored inks substantially comprise, in particular, a white shade and/or a plurality of white shades. Depending on the requirements or higher transparency or better projection display implementation, one white tone may be used, and/or multiple white tones may be combined with each other.

The transparency of the projection surface and thus of the viewing window can be kept constant by applying a light-colored ink to the projection surface. The printer may typically exhibit or print at different intensities or contrasts. This means that the intensity of the at least one light-colored ink can be set such that the projection surface obtains a "very thin" coating of the ink, also referred to as ink film or film, which ultimately remains unaffected by the printed projection surface negatively affecting the transparency properties of the projection surface and the transparency properties of the viewing window.

Advantageously, the ink-jet printing is carried out directly on the viewing window. This makes it possible to dispense with the adhesive or fixing of the projection surface to the viewing window, thereby making the production process easier and at the same time more cost-effective.

Instead of direct inkjet printing of the viewing window, inkjet printing can be carried out indirectly on the viewing window. This means that the ink-jet printing is carried out on an additional component or an additional element which is suitable as a projection surface and which can then be arranged at or on the viewing window. The additional component or the additional element suitable as a projection area may in particular comprise at least one foil and/or a flat glass plate and/or a flat plate-like object made of at least one polymer and/or a flat sheet made of at least one polymer and/or a further flat element.

According to a second aspect of the invention, the object is achieved by a method for producing a projection surface on a viewing window of a household appliance. In order to carry out the method, a housing having an opening is provided, and a door unit is provided, wherein the door unit is designed to close the opening. A viewing window is also provided, which is arranged in the door unit, wherein the viewing window is substantially transparent, so that it is ensured that the interior of the housing can be seen. A projection surface is also provided, wherein the projection surface is arranged in the region of the viewing window, wherein the projection surface is produced by inkjet printing.

Preferably, the viewing window is printed directly by inkjet printing. The assembly of the viewing window in the door unit can thus take place directly after the printing of the viewing window. It is also contemplated that printing may occur during the process as the viewing window is manufactured.

Alternatively, the projection surface is produced at or on an element, wherein the element is printed by inkjet printing, wherein the element is composed of at least one foil and/or glass and/or at least one polymer. The viewing window is thus processed indirectly by inkjet printing.

Depending on the way the viewing window is manufactured, direct printing of the viewing window may be advantageous, or printing of the element may be advantageous.

Advantageously, the printed element is arranged on the viewing window.

This has the advantage that the projection surface can be produced in an external working step and can be easily replaced in the event of damage to the projection surface in the assembled state.

The projection surface is preferably produced by at least one light-colored ink.

The light-colored inks comprise advantageously substantially one white tone and/or a plurality of white tones.

According to a third aspect of the invention, the object is achieved by a door unit of a household appliance having a viewing window, wherein the viewing window is substantially transparent, wherein the viewing window comprises a projection surface according to one of the preceding aspects.

Drawings

Further characteristics and advantages of the invention emerge from the following description with reference to the attached drawings.

Fig. 1 shows a front view of a fluid-conducting household appliance;

fig. 2 shows a front view of the household appliance;

fig. 3 shows an exploded view of a door unit of a fluid-conducting household appliance;

fig. 4 shows a sectional view of an embodiment of a door unit of a fluid-conducting household appliance;

fig. 5 shows a printed viewing window of a door unit of a fluid-conducting household appliance;

fig. 6 shows a fluid-conducting household appliance having an internal device and/or an external device.

Detailed Description

Fig. 1 and 2 each show a front view of the household appliance 1. In particular, fig. 1 and 2 show a large household appliance.

The household appliance shown in fig. 1 may be, for example, a fluid-conducting household appliance 1a, such as a washing machine, a washer-dryer or a laundry-dryer or a dishwasher, a fully automatic coffee machine and/or a steam cooker and/or a similar fluid-conducting household appliance.

The household appliance 1 shown in fig. 2 may be an oven or a range or a microwave oven or a hot drawer or a range hood, in particular a so-called desk fan, which can be lowered into a countertop, for example.

The concepts mentioned or used in the following relate not only to the fluid-conducting household appliance 1a but also to the household appliance 1 shown in fig. 2.

Fig. 1 shows a fluid-conducting household appliance 1a in particular. The exemplary fluid-conducting household appliance 1a is a washing machine 3. As already mentioned above, the fluid-conducting household appliance 1a can alternatively be a washing and drying machine or a laundry and drying machine. The fluid-conducting household appliance 1a may also be a dishwasher, a fully automatic coffee machine and/or a steam cooker. In the following, the embodiment is basically described by means of a washing machine 3.

The washing machine 3 includes a housing 5. A receiving container 6 is arranged in the housing 5, in which receiving container in the illustrated embodiment substantially items to be cleaned, for example laundry, are received. The housing 5 has a front side 7 and side walls 9. An opening 11 is formed in the front side 7 of the housing 5. The opening 11 can be closed by a door unit 13. The door unit 13 is substantially rotatably fixed to the housing 5. The flushing-in housing 15 is also shown schematically in the upper region of the front side 7 of the washing machine 3. In addition to the flushing-in housing 15, a switch 17 is arranged in the upper region of the front side 7 of the fluid-conducting household appliance 1a. The switch 17 can also be configured as a push button or the like. The switch 17 is used essentially to switch the fluid-conducting household appliance 1a on and off.

Fig. 2 shows a household appliance 1. As already mentioned above, the household appliance 1 can be an oven or a range or a microwave oven or a hot drawer or a hood, in particular a so-called desk fan, which is lowered into a countertop, for example. The household appliance 1 comprises a housing 5. A receiving container 6 is arranged in the housing 5, wherein, for example, food or foodstuffs and/or goods are received in the receiving container 6. In the range hood, flue gas is mainly received, or so-called flue gas is absorbed. Fumes are fumes, which are mainly produced during baking and cooking.

The housing 5 also has a front side 7 and/or an outer side 7a and a side wall 9 or a wall element 9a. An opening 11 is formed in the front side 7 of the housing 5. The opening 11 can be closed by a door unit 13. The door unit 13 is substantially rotatably fixed to the housing 5. However, it is also conceivable for the door unit 13 to be fastened to the housing 5 in a reversible and/or movable manner.

Fig. 3 shows an exploded view of the door unit 13. The door unit 13 is suitable in particular for a fluid-conducting domestic appliance 1a. The door unit 13 has a viewing window 19, wherein the viewing window 19 can also be referred to as a viewing pane. The viewing window 19 is substantially transparent. A projection surface 20 is arranged in the region of the observation window 19. The projection surface 20 can extend at least over a partial region 21 of the observation window 19. However, it is also conceivable for the projection surface 20 to extend over substantially the entire viewing window 19 or at least over a large part of the viewing window 19. The projection surface 20 is used to display a projected image 23. Projection 23 is shown schematically in fig. 1. Projection 23 shows in fig. 1, for example, the washing program name: easy Care' in which the number of washes, the time remaining and the rotational speed of the receiving vessel 6 are displayed. However, it is also contemplated that additional information may also be displayed. The further information can be displayed in addition to the already described information or on a further display plane which is, for example, switched on when, for example, an operating program is selected. The plane of projection 20 is further discussed in detail below.

The door unit 13 further comprises a first frame element 27, a second frame element 29, a window ring 31 and a window element 33. The window element 33 is arranged substantially between the first frame element 27 and the second frame element 29. The window element 33 is substantially received in the second frame element 29. The viewing window 19 is arranged on the first frame element 27. The window element 33 and the viewing window 19 are arranged substantially opposite one another, the window element 33 projecting into the housing 5, in particular into the receiving container 6 of the fluid-conducting household appliance 1a, in the closed state of the door unit 13. The observation window 19 is arranged substantially outside the housing 5 of the fluid-conducting household appliance 1a in the closed state of the door unit 13. A cavity 35 is formed between the viewing window 19 and the window element 33.

In the cavity 35, an optical unit 37 is arranged primarily for conducting a light beam 38 (shown in fig. 4 by way of example) onto the projection surface 20 or the subregion 21 of the observation window 19. The light beam 38 is generated by a projection unit 39. The projection unit 39 is discussed in detail below. The optical unit 37 mainly includes a holding member 41 and a mirror-like member 43. The optical unit 37 is arranged in the cavity 35 in such a way that an operator can preferably see into the receiving container 6 of the fluid-conducting household appliance 1a in the closed state of the door unit 13.

The projection unit 39 is preferably arranged between the first frame element 27 and the second frame element 29. The projection unit 39 is preferably arranged in the lower region of the first frame element 27. The projection unit 39 can be mounted on the first frame element 27 by means of a holding device 40. The projection unit 39 can be arranged on the first frame element 27 in such a way that the projection unit 39 is arranged in the cavity 35 or at least projects into the cavity 35. However, the projection unit 39 may also be arranged outside the cavity 35. The optical unit 37 is arranged substantially opposite the projection unit 39, so that, as already mentioned, the light beam 38 generated and output by the projection unit 39 is guided by the optical unit 37 onto the projection surface 20.

The projection unit 39 mainly includes a projector 45 and a calculation unit 47. The calculation unit 47 is arranged for controlling the projector 45. The calculation unit 47 is provided for calculating the projection pattern 23, which is to be emitted by the projector 45. The projection unit 39 further comprises a control unit 49. The control unit 49 is arranged for controlling the projector 45. The control unit 49 may in particular be an LCoS control unit. The control unit 49 is provided for displaying the projected pattern 23 calculated by the calculation unit 47 in such a way that the projector 45 can output the projected pattern 23 by controlling the control unit 49, or the control unit 49 is provided for outputting the projected pattern 23 calculated by the calculation unit 47 in such a way that the projector 45 can display the projected pattern 23 by illuminating the optical unit 37 or the projection surface 20. In order to prevent the projection unit 39 from overheating, a cooling unit 51 is configured in the projection unit 39. The cooling unit 51 is provided for cooling at least one further component of the projection unit 39, for example the projector 45, the calculation unit 47 and/or the control unit 49.

The window ring 31 serves essentially for fastening the door unit 13, wherein the window ring 31 is designed primarily as a molding. The grip element 32 can be formed, for example, on the window ring 31, if the grip element 32 is required or desired. Additionally, the window ring 31 serves for fastening the first frame element 27 and/or the second frame element 29 and is essentially designed in such a way that the first frame element 27 and/or the second frame element 29 is surrounded by the window ring 31.

Fig. 4 shows a sectional view of a possible embodiment of a door unit 13 of a fluid-conducting household appliance 1a. The optical unit 37, in particular the holding element 41 of the optical unit 37, is here exemplary arranged in the upper region of the window element 33. Thereby also providing the operator with the possibility to view through the viewing window 19 and the window element 33.

It is exemplarily stated that the interaction surface 57 can be considered in the region of the projection surface 20, so that a user can set a fluid-conducting household appliance 1a by means of the interaction surface.

The optical unit 37 is arranged in fig. 4 as an example in the upper region of the window element 33 and is oriented in such a way that the light beam 38 emerging from the projection unit 39 is projected onto the projection surface 20 or the interaction surface 57. The projection surface 20 or the interaction surface 57 is exemplarily arranged in an upper region of the viewing window 19. However, it is also conceivable for the projection surface 20 or the interaction surface 57 to be formed substantially over the entire viewing window 19. The optical unit 37 can be arranged or fixed on the window element 33 by means of different fixing methods and/or connecting methods or connecting techniques.

The projection surface 20 is produced by a printing method, a so-called inkjet printing method. In the case of the inkjet printing method, individual ink drops are ejected or applied to the side to be printed. The printed surface, which may be, for example, a printed image or, for example, in this case, the projection surface 20, is formed by arranging a plurality of ink drops on one another. Ink jet printing is usually carried out without contact, so that scratching of the material to be printed can be made virtually impossible.

The projection surface 20 of the viewing window 19 consists of at least one film and/or at least one foil and/or glass and/or at least one polymer. The viewing window 19 is preferably made of glass and/or at least one polymer. The plane of projection 20 may be made of the same material as the viewing window 19. However, it is also conceivable for the projection surface 20 to already be integrated into the viewing window 19. It is likewise conceivable for the projection surface 20 to be a projection foil. In this case, the projection foil is processed by an ink-jet printing method. It is however important that the viewing window 19 remains transparent after application of the projection foil.

The viewing window 19 may be covered as a sheet material and then processed by an inkjet printing method. However, it is also conceivable for the viewing window 19 to be produced by injection molding. In the injection molding method, the surface of the member to be injection molded may have a rough surface. It is proposed here to consider a projection foil as already described above to provide the projection surface 20. A projection foil is understood here to be a foil which is processed at least partially by an inkjet printing method.

Advantageously, at least one light-colored ink is used for the inkjet printing method. The at least one light-colored ink may consist of a plurality of different white shades. However, it is also conceivable to use only one white tone. Uv-curable inks and/or uv-curable lacquers are particularly suitable here. Uv-curable inks and/or uv-curable lacquers also have the special property that they adhere well to PMMA materials, glass and other materials.

Fig. 5 shows an exemplary section of a viewing window 19 of a door unit 13 of a fluid-conducting household appliance 1a, which is printed (at least in part) by an inkjet printing method.

The viewing window 19 is applied with an ink coating, which is produced by an ink jet printing process. In other words, the ink film 53 is applied on the observation window 19. The ink film 53 can be applied with a certain strength, which means that the ink film 53 can be very thin, hardly visible, but also very robust. The ink film 53 can of course also be applied with a strength between very thin and thick. Preferably, the ink film 53 is applied with a strength that is substantially below 50% of the maximum possible strength of the ink film 53 or ink coating. Since the strength of the ink film 53 or ink coating is different for different printing presses, only one example is listed below, for example in which strength range the ink coating or the application of the ink film is to be effected.

In fig. 5, the flatbed printer of the trademark Mimaki is used in the following example or in the printed element 53a, which is a section of the viewing window 19. The plane of projection 20 is in this embodiment directly printed onto the viewing window 19. The printing intensity is selected such that the transparency properties of the printed element 53a, in this case the viewing window 19 itself, are maintained after printing of the element 53a or the viewing window 19. However, it is known to the person skilled in the art that a higher color intensity provides a better projection quality on the projection surface. The color intensity of the printing press can be set according to which criterion indicates that it is more important.

In this example, the color intensity is selected such that the ink film 53 is applied such that a well-visible projection 23 is displayed on the viewing window 19 or on the viewing glass window 19, but also in the receiving container 6 of the household appliance 1a through which the fluid is guided by viewing. In the embodiment shown in fig. 5, the color intensity is selected, for example, between 0.5% and 10%, preferably between 1% and 8%, preferably between 1.5% and 6%, particularly preferably between 2.5% and 4.5% of the maximum color intensity. An ink film 53 is thereby applied on the viewing window 19, said ink film being visible to the human eye, without however limiting the visibility.

In the following, the individual steps of how a viewing window 19 with a projection surface 20 can be produced are briefly explained. First, a method is described in which the projection surface 20 is applied directly on the observation window 19. Then, a method is described in which the observation window 19 is indirectly provided with the projection surface 20.

In particular, it is cost-effective to select plate-shaped materials and/or disk-shaped elements for producing the viewing window 19 and/or the projection surface 20. Alternatively, the viewing window 19 can also be produced or sprayed or produced by means of a suitable injection molding method. The plate-like material and/or the disk-like element are well suited for being cut out and placed in a printing press and printed. The plate-shaped material can also be easily adapted to the desired shape, whereby for example slight bending can be introduced into the plate-shaped material. Other possibilities for processing the plate-shaped material are conceivable.

The material may be provided as a plate-like material and/or as a disc-like element. The desired element, which essentially corresponds to the viewing window 19, is cut out of the plate-shaped material or the disc-shaped element. The conceptual viewing window 19 now continues to be used hereinafter. The cut-out viewing windows 19 are also processed by an ink-jet printing method. In the selected or desired inkjet printing method, at least one partial region 21 of the viewing window 19 is directly printed or applied with at least one light-colored ink, thereby producing an ink film 53 on the viewing window 19 which is hardly visible to the human eye. The projection surface 20 is realized by applying ink to the viewing window 19, which projection surface is formed directly on the viewing window 19. The projection surface 20 substantially corresponds to the ink film 53.

The printed viewing window 19 can then be brought for further processing. This may for example involve bending of the viewing window 19 and/or engagement and/or clamping of the viewing window 19 into the door unit 13.

The direct printing of the plate-shaped material or the viewing window 19 or the direct application of the projection surface 20 or the ink film 53 onto the viewing window 19 is advantageously carried out before the viewing window 19 is installed in the door unit 13 of the household appliance 1, as described above. Direct printing is understood here to mean that no additional components are required to realize the projection surface 20, but that the projection surface 20 is printed or applied directly onto the viewing window 19.

The indirect printing of the viewing window 19 can take place at or on the element 25, which is for example a foil and/or an additional plate-like material. The element 25 may be made of at least one polymer and/or glass and/or another similar material. The element 25 may also be preferably provided with an ink film 53, which is applied by means of an ink-jet printing method. Thereby producing printed element 53a. The ink film 53 corresponds here to the previously described ink film 53 and has a similar color strength. The foil is preferably placed at or on the viewing window 19 after being printed. However, it is also conceivable that the printing or production of the projection area 20 can take place immediately after the placement of the element 25. Printing can also be eliminated if a projection foil is to be used. In order to ensure good visibility of the projection image 23 on the projection surface 20, the element 25 should be mounted on the viewing window 19 or on the viewing pane 19 without bubbles. The viewing window 19 provided with the projection surface 20 can then be integrated into the door unit 13 of the domestic appliance 1. However, it is also conceivable for the viewing window 19 to be integrated first into the door unit 13 and then to be provided with the projection surface 20.

Fig. 6 shows a further exemplary embodiment of a fluid-conducting household appliance 1a. In the exemplary embodiment shown in fig. 6, the fluid-conducting household appliance 1a has an internal device 59 and/or an external device 61 for communication of an operator or user with the fluid-conducting household appliance 1a. The internal device 59 and/or the external device 61 may be a tablet computer, a smart phone, or the like. Importantly, the internal device 59 and/or the external device 61 comprise a touch-sensitive surface and/or a touch-sensitive display device for displaying and setting operating parameters and/or program parameters.

The fluid-conducting household appliance 1a has a communication unit 63. The communication unit 63 is integrated with the internal device 59 and/or the external appliance 61 and communicates with the internal device 59 and/or the external appliance 61. The communication unit 63 is provided in such a way that at least the projection 23 and/or the operating unit 25 can be transmitted to the internal device 59 and/or the external device 61. This makes it possible to display the fluid-conducting household appliance 1a and/or the projection surface 20 of the washing machine 3 on the internal device 59 and/or the external appliance 61. However, it can also be provided that the external device 61 can be arranged on the fluid-conducting household appliance 1a, or that the internal device 59 is formed in and/or on the fluid-conducting household appliance 1a. The internal device 59 may have similar characteristics as the external device 61.

The communication unit 63 is also provided such that the communication unit 63 receives input commands from the internal device 59 and/or the external appliance 61 and transmits the input commands to the control device 69. The control device serves to control the fluid-conducting household appliance 1a, but also the projection unit 39 and its components. This provides the operator with the possibility of communicating with the fluid-conducting household appliance 1a and/or washing machine 3 without directly inputting the input command on the fluid-conducting household appliance 1a and/or washing machine 3.

The external device 61 may be a smartphone or tablet computer on which the projected pattern 23 may be image-displayed. It may also be proposed to operate the fluid-conducting household appliance 1a by means of an external device 61. The internal device 59 may be a processor. However, it can also be provided that the internal device 59 is a smartphone or tablet computer, which is detachably connected to the fluid-conducting household appliance 1a or fixedly connected to the fluid-conducting household appliance 1a. The characteristics of the internal device 59 may be the same as the characteristics of the external device 61.

The communication unit 63 can be arranged, for example, in the fluid-conducting household appliance 1a or in the door unit 13 of the household appliance 1. However, the communication unit 63 can also be arranged at any other installation location in the door unit. Advantageously, the communication unit 63 should be arranged in the region of the projection unit 39. However, it can also be provided that the communication unit 63 is integrated into the projection unit 39. The communication unit 63 may be connected with the projection unit 39 wirelessly and/or by electrical connection means.

In particular, the exemplary embodiments illustrated in fig. 3 to 6 can be selected not only for the household appliance 1 illustrated in fig. 2 but also for the fluid-conducting household appliance 1a illustrated in fig. 1 and are not limited to the respective

exemplary household appliance

1 or 1a.

List of reference numerals

1. Household appliance

1a fluid-conducting household appliance

3. Washing machine

5. Shell body

6. Receiving container

7. Front side

7a. Outer side

9. Side wall

9a wall element

11. Opening of the container

13. Door unit

15. Punching shell

17. Switch with a switch body

19. Observation window

20. Projection surface

21. Part area of the observation window

23. Projection drawing

25. Component

27. First frame element

29. Second frame element

31. Window ring

32. Handle bar

33. Window element

35. Hollow cavity

37. Optical unit

38. Light beam

39. Projection unit

40. Holding device

41. Holding element

43. Mirror-like element

45. Projector

47. Computing unit

49. Control unit

51. Cooling unit

53. Ink film

53a. Printed element

57. Interactive surface

59. Internal device

61. External device

63. Communication unit

69. And a control device.

Claims

1. A household appliance (1), wherein the household appliance (1) comprises:

a housing (5) having a receiving container (6) and an opening (11);

a door unit (13), wherein the door unit (13) is provided for closing the opening (11);

a viewing window (19) which is arranged substantially in the door unit (13), wherein the viewing window (19) is configured substantially transparent so that the receiving container (6) can be viewed when the opening (11) is closed;

a projection surface (20), wherein the projection surface (20) is arranged in the region of the observation window (19),

it is characterized in that the preparation method is characterized in that,

the projection surface (20) can be produced by inkjet printing, so that the projection surface (20) is also substantially transparent.

2. Household appliance (1) according to claim 1, characterized in that the projection surface (20) of the viewing window (19) has at least one film and/or foil and/or is composed of glass and/or at least one polymer, wherein the viewing window (19) is composed of glass and/or at least one polymer.

3. Household appliance (1) according to claim 1 or 2, characterized in that the intensity of the ink coating applied onto the projection surface (20) by the inkjet printing substantially corresponds to less than 50% of the maximum possible intensity of the inkjet-printed ink coating.

4. Household appliance (1) according to any one of the preceding claims, characterized in that the inkjet printing comprises at least one light-colored ink that can be applied onto the projection surface (20).

5. The household appliance (1) according to claim 3, characterized in that the light-colored inks comprise different inks, wherein the light-colored inks substantially comprise, in particular, a white tone and/or white tones.

6. Household appliance (1) according to any of the preceding claims, characterized in that said inkjet printing is carried out directly on said viewing window (19).

7. Household appliance (1) according to any of the preceding claims, characterized in that said ink-jet printing is carried out indirectly on said viewing window (19).

8. A method for producing a projection surface (20) on a viewing window (19) of a household appliance (1), comprising:

providing a housing (5) having an opening (11);

providing a door unit (13), wherein the door unit (13) is designed to close the opening (11),

providing a viewing window (19) which is arranged substantially in the door unit (13), wherein the viewing window (19) is configured substantially transparent, so as to ensure that the interior of the housing (5) can be seen,

providing a projection surface (20), wherein the projection surface (20) is arranged in the region of the observation window (19),

it is characterized in that the preparation method is characterized in that,

the projection surface (20) is produced by ink-jet printing.

9. The method according to claim 7, characterized in that the viewing window (19) is printed directly by the inkjet printing.

10. Method according to claim 7, characterized in that the projection surface (20) is produced at or on an element (25), wherein the element (25) is printed by the inkjet printing, wherein the element (25) consists of at least one film and/or at least one foil and/or glass and/or at least one polymer.

11. Method according to claim 10, characterized in that a printed element (25) is placed on the viewing window (19).

12. Method according to any one of the preceding claims, characterized in that the projection surface (20) is produced by means of at least one light-colored ink.

13. Method according to claim 12, characterized in that the light-coloured ink substantially comprises one and/or more white shades.

14. A door unit (13) of a household appliance (1) having a viewing window (19) which is constructed substantially transparent, wherein the viewing window (19) comprises a projection surface (20) according to one of claims 1 to 7.