WO2013024093A1

WO2013024093A1 - Household appliance plate with impedance-increasing insulating regions

Info

Publication number: WO2013024093A1
Application number: PCT/EP2012/065894
Authority: WO
Inventors: Jorge Alaman Aguilar; Miguel Angel BUÑUEL MAGDALENA; Claudio Carretero Chamarro; Enrique CARRETERO CHAMARRO; Diego Cuartielles Ruiz; Francisco Javier Ester Sola; Oscar Lucia Gil; Jose Joaquin Paricio Azcona; Pilar Perez Cabeza; Fernando Planas Layunta; Rosario Romeo Velilla
Original assignee: BSH Bosch und Siemens Hausgeräte GmbH
Priority date: 2011-08-17
Filing date: 2012-08-14
Publication date: 2013-02-21

Abstract

The invention relates to a household appliance plate with a base plate (10a-g) and at least one at least partially electrically conductive layer system (12a-g) which is arranged on at least one lateral subregion (14a-g) of the base plate (10a-g) and comprises at least one first region (16a-g) and at least one second region (18a-g) adjoining the first region (16a-g). According to the invention, in order to provide a household appliance plate of the type in question that combines advantageous properties in terms of electromagnetic compatibility and flexible design possibilities, the first region (16a-g) and the second region (18a-g) are electrically conductively connected and the layer system (12a-g) comprises one or more insulating regions (20a-g, 21 a-g) that at least substantially increase an impedance between the first region (16a-g) and the second region (18a-g).

Description

HOME APPLIANCE PLATE WITH IMPEDAN INCREASING INSULATING AREAS

The invention relates to a household appliance plate according to the preamble of claim 1

From WO 201 1/020720 A1 a domestic appliance plate for an induction hob is known. The appliance plate has a base body and arranged on this a metallic coating. The metallic coating has two regions, which are electrically insulated from each other by an insulating region, whereby an electromagnetic compatibility of the induction hob can be increased.

The object of the invention is in particular to provide a generic household appliance plate, which combines advantageous properties with respect to electromagnetic compatibility with flexible design options. The object is achieved by the features of claim 1 and the method claim 9, while advantageous embodiments and refinements of the invention can be taken from the dependent claims.

The invention relates to a household appliance plate having a base plate and at least one at least partially electrically conductive layer system, which is arranged on at least one side portion of the base plate and at least a first region and at least one second region adjacent to the first region.

It is proposed that the first region and the second region are electrically conductively connected and the layer system has one or more insulating regions which at least substantially increase an impedance between the first region and the second region. A "base plate" is to be understood, in particular, as a spatial element which, in an execution Viewed in a plane, in a cross section perpendicular to the plane has a non-circular cross-sectional area and perpendicular to the plane has a particular at least substantially constant material thickness, the less than 50%, preferably less than 25% and particularly preferably less than 10% of an extension of the spatial element parallel to the plane, in particular a smallest extent of the element parallel to the plane. In this context, a "layer system" is to be understood as meaning, in particular, a spatial unit which is adapted to a shape of a surface of the base plate and in particular has a maximum thickness which is less than a minimum thickness of the base plate In particular, the layer system and in particular individual layers of the layer system can have recesses into which in particular further layers of the layer system can intervene in an element, in particular a layer, which in particular extends from a first surface of the element to an opposite second surface of the element.

In this context, a "at least partially electrically conductive layer system" is to be understood as meaning, in particular, a layer system which has at least one electrically conductive region, Preferably, the layer system has a layer which is electrically conductive When the household appliance plate is used as a cooktop plate in an induction hob, this electrically conductive layer preferably has a thickness of at most 100 nm, in particular not more than 50 nm, and particularly preferably not more than 10 nm with a specific electrical

Resistance of at most 10.sup.- ⁴ square meters, in particular maximally 10.sup.- ⁵ square meters, preferably at most 10.sup.- ⁶ square meters and particularly advantageously maximally 10.sup.- ⁷ square meters at 20 ° C to be understood. A "side part region" of the main body is to be understood here and below as meaning, in particular, a region of a surface of the baseplate. is arranged on at least one side portion of the base plate ", should be understood in particular that the layer system is applied to the side part region, preferably immediately. Particularly advantageous is the layer system attached to the side portion of the body. Preferably, the layer system and in particular individual layers of the

Layer system by at least one coating method, in particular by a screen printing method, preferably applied by a chemical or physical vapor deposition and particularly advantageously by a sputtering on the side panel. A "cathode sputtering" is to be understood in particular as meaning a coating process in which atoms and / or molecules are dissolved out of a solid-state target by bombardment with high-energy ions, preferably noble gas ions, into the gas phase and deposited on the workpiece to be coated Layer system, a metallic layer, which in particular by a

Sputtering is applied, and preferably a particular dielectric protective layer. A "protective layer" is to be understood in particular as meaning a spatial element which is adapted to a shape of a surface of the layer facing away from the base plate and protects the layer against chemical and / or thermal and / or mechanical effects Higher chemical resistance in a given environment and / or a higher temperature resistance and / or a higher mechanical strength, in particular a higher hardness.

An "insulating region" is to be understood in particular as meaning a region of the layer system which at each point has a specific resistance at 20 ° C. of at least 10 ¹⁰ Ωm, in particular of at least 10 ¹¹ dm and preferably of at least 10 ¹² Ωm. By the fact that the first area and the second area are "electrically connected", it should be understood in particular that an electrically conductive path connecting the two areas exists.Preferably, the first area and the second area are only by an insulating area and / or A "connection region" is to be understood in particular a region of the layer system which connects the first region and the second region in an electrically conductive manner and which is arranged in particular between the two regions and at least one insulating region. By the fact that one or more insulating regions "at least substantially increase the impedance between the first region and the second region", it should be understood in particular that an amount of the impedance in an arrangement with at least one insulating region is at least 1.5 times, in particular at least 2 times, preferably at least 3 times and particularly advantageously at least 4 times as large as in an arrangement in which the at least one insulating region is replaced by electrically conductive material.

By virtue of such an embodiment, advantageous properties with regard to electromagnetic compatibility can be made possible, in particular in the case of

Use of the household appliance plate in an induction hob, since then in an operating state in the at least partially electrically conductive layer system induced high-frequency currents can be advantageously attenuated by increasing the impedance. In particular, relevant legal regulations and standards can be complied with. Furthermore, advantageous flexible

Design options are developed. Furthermore, an advantageous appearance can be achieved, in particular a gloss effect, if the layer system comprises a metallic layer. The insulating region is advantageously a line-like insulating region. In this context, a "line-type insulating region" is to be understood as meaning, in particular, an insulating region which has a longitudinal extent, which at least at least 5 times, in particular at least 10 times and preferably at least 15 times as large as at least one transverse to the longitudinal extent transverse extension. A "longitudinal extent" is to be understood as meaning, in particular, a maximum extension of the linear insulation region in a developed and straight state. is, should be understood in particular that a relative deviation is at most 15%, in particular at most 10% and advantageously at most 5%. Preferably, a width of the line-like insulating regions is transverse to one

Normals of a main extension plane of the base plate at least 10 μηη. The width of the line-like insulating regions may in particular be greater than 2 mm. Preferably, however, the width is at most 2 mm. This allows a particularly attractive appearance can be achieved. In particular, filigree markings can be made possible.

It is also proposed that at least the first area is an active area. An "active region" of the layer system is to be understood here and below as meaning, in particular, an area of the layer system which, in at least one installed and ready-to-operate state, covers a functional element, in particular a heating element and preferably an induction heating element, of a household appliance having the domestic appliance plate, preferably upward In particular, the active region is penetrated by an electromagnetic field, in particular a magnetic field of the induction heating element, in at least one operating state, whereby the electromagnetic compatibility of the domestic appliance having the domestic appliance can advantageously be increased According to a preferred embodiment of the invention, it is proposed that the second region is also an active region, which can further improve the electromagnetic compatibility be possible. In a particularly preferred embodiment of the invention, it is proposed that the layer system has a third region adjoining the second region and electrically connected thereto, and one or more further insulating regions having an impedance between the second

At least significantly increase the range and the third range. Preferably, the second region and the third region are spaced apart only by an insulating region and / or a connection region between two insulating regions. In particular, the third area may also be an active area. As a result, it is advantageously possible to achieve a further improvement in electromagnetic compatibility. Furthermore, a particularly advantageous appearance can be achieved

It is also proposed that at least one of the regions is disc-shaped and has an at least partially curved outer contour. By "at least one of the regions being disc-shaped" is to be understood, in particular, that the region is delimited on at least two sides by two mutually parallel and in particular identical base surfaces. An "at least partially curved outer contour" should in particular be understood to mean a curved boundary of the area in the case of a projection of the area onto a plane parallel to the base areas. Preferably, at least one of the areas is circular disk-shaped. In this context, the term "circular disk-shaped" should be understood to mean, in particular, a flat cylinder, whereby an advantageous adaptation to a shape of a functional element, in particular a heating element, can be achieved, in particular when used in a hob proposed that at least one of the areas is annular disc-shaped. "Disc-shaped" should be understood in particular disc-shaped with an inner recess. In this context, an "inner recess" is to be understood as meaning, in particular, a recess which makes it impossible to remove the rod by movement of the rod perpendicular to the direction of insertion during an imaginary insertion of an infinitely long rod of any thickness along an insertion direction As a result, an advantageous adaptation to a shape of the functional element, in particular of a heating element, can be achieved, in particular when used in a hob and especially when a plurality of active elements are assigned to a functional element.

If the layer system has at least two congruent insulating regions which, viewed perpendicularly to the main extension plane of the base plate, are evenly distributed over an outer contour of at least one of the regions, production can be simplified. Furthermore, an advantageous appearance can be achieved. Under two "congruent" insulating areas in this

In particular two insulating regions are understood, which can be converted into one another by at least one congruent image, in particular a rotation and / or a parallel displacement and / or a reflection and / or a combination of these geometric images. Including that the insulating areas considered perpendicular to the base plate evenly over a

In particular, it is to be understood that two adjacent insulating regions have the same spacing measured along the outer contour, Furthermore, a method for producing a domestic appliance plate is proposed which has a base plate and at least one electrically conductive layer system is arranged on at least one side portion of the base plate and at least a first region and at least one second region adjacent to the first region, in which the first region and the second region are electrically conductively connected and an impedance between the first region and the second region At least one insulating region in the layer system is at least substantially increased Advantageous properties with respect to electromagnetic compatibility can be made possible, in particular when using the appliance plate in an induction hob. Furthermore, a favorable appearance can be achieved. Furthermore, a production of the household appliance plate can be accelerated since less material has to be removed. Preferably, the insulating regions are produced by laser processing, preferably laser ablation, of at least one previously applied layer of the layer system. In this context, "laser processing" of a material is to be understood as meaning, in particular, processing of the material by irradiation of laser light

Laser light to a physical change, in particular an evaporation, and / or a chemical change, in particular an oxidation or decomposition of the material. The term "laser ablation" is to be understood to mean, in particular, laser processing in which a material irradiated by laser light is understood to mean, in particular, that the insulating region is "produced by laser processing." removed, in particular, evaporated. When manufacturing at least one insulating region with a laser processing, particularly delicate insulating regions can be created. Furthermore, a high reproducibility in the production can be achieved. Furthermore, the production can be further accelerated.

Furthermore, a household appliance, in particular a cooktop, with a household appliance plate according to the invention is proposed. Preferably, the hob is as a

Induction hob formed.

Further advantages emerge from the following description of the drawing. In the drawings, embodiments of the invention are shown. The drawing, the descriptions and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations. Show it:

1 a formed as an induction hob home appliance with a household appliance plate in a plan view,

1 b, the appliance plate in a not to scale sectional view taken along a line Ib-Ib in Fig. 1 a,

2 shows a detail of a further appliance plate in a plan view,

3 shows a detail of an alternative domestic appliance plate in a plan view,

4 shows a detail of a further alternative domestic appliance plate in a plan view,

5 shows a detail of a further appliance plate in a plan view,

Fig. 6 shows a detail of an alternative domestic appliance plate in a plan view and

Fig. 7 shows a detail of a further alternative domestic appliance plate in a plan view.

FIG. 1a shows a domestic appliance designed as a hob 34a with a domestic appliance plate designed as a hob plate 36a. The hob plate 36 a comprises a base plate 10 a made of a glass ceramic. The base plate 10a is at least partially transparent. The hob plate 36a has markings 38a, which indicate heating zones 40a, of which in Fig. 1a only one is marked. Although the markings 38a have a finite width 54a, viewed perpendicularly to a main extension plane of the base plate 10a, the markings 38a in FIG. 1a are simply drawn as lines. The cooktop panel 36a is horizontally disposed in an operative state of the cooktop 34a and is provided for setting up cooking utensils on an upper surface 42a of the base plate 10a and the heating zones 40a. Below the heating zones 40a, induction heating elements, not shown, are arranged in FIG a heating of the set up on the corresponding heating zones 40a Gargeschirrs are provided by induced eddy currents.

FIG. 1 b shows a sectional representation, not true to scale, of the household appliance plate along a line Ib-Ib in FIG. 1 a. The base plate 10a has a layer system 12a on a side portion 14a opposite the upper side 42a. The side portion 14a extends over an entire bottom 44a of the base plate 10a. The layer system 12a comprises a metallic layer 46a. The metallic layer 46a creates a metallic appearance of the hob plate 36a. The metallic layer 46a has a thickness 48a of about 10 nm. Due to the relatively small thickness 48a, which corresponds to only a fraction of the magnetic penetration depth of a magnetic field generated by the induction heating, a negative impact of an effect of the magnetic field on the cooking dishes to be heated can be largely avoided. On a side of the metallic layer 46a facing away from the base plate 10a, the metallic layer 46a is covered with a protective layer 50a. The protective layer 50a is a dielectric ink layer. The metallic layer 46a has a first region 16a and a second region 18a adjoining the first region 16a (see Fig. 1a). The first region 16a is an active region 24a which, viewed in its dimensions perpendicular to the main extension plane of the base plate 10a, corresponds to the heating zone 40a. The second area 18 a is an inactive area, namely around a surrounding area 52 a of the heating zone 40 a. The first region 16a is circular disk-shaped. A height of a circular disk corresponds to the thickness 48a of the metallic layer 46a.

The first region 16a and the second region 18a are electrically conductively connected to one another, as can be seen from FIG. 1a. However, the layer system 12a has two insulating regions 20a, 21a, which substantially increase an impedance between the first region 16a and the second region 18a. The insulating regions 20a, 21a are filled with material of the protective layer 50a (cf. Fig. 1 b). The insulating regions 20a, 21a are formed as line-like insulating regions 22a, 23a. Viewed perpendicular to the main extension plane of the base plate 10a, the width 54a of the line-like insulating regions 22a, 23a is approximately 500 μm. The insulating regions 20a, 21a are distributed congruently and, viewed perpendicular to the main extension plane of the base plate 10a, uniformly distributed over a circular outer contour 32a of the region 16a. Viewed perpendicular to the main extension plane of the base plate 10a, the insulating regions 20a, 21a have a shape of a circular ring segment. The circular ring segments in each case cover an angle between 160 ° and 180 ° and in particular less than 180 °. The protective layer 50a is visible in the region of the insulating regions 20a, 21a from the upper side 42a of the base plate 10a and forms the marking 38a of the heating zone 40a. By different colors of the protective layer 50a differently colored markings 38a can be created.

By increasing the impedance between the first region 16a and the second region 18a, eddy currents induced in the metallic layer 46a during operation of the induction heating elements can be damped, whereby an electromagnetic compatibility of the hob 34a can advantageously be increased.

In a production of the home appliance plate, a coating of the base plate 10a is first made with the metallic layer 46a. Preferably, a sputtering is used in this case. Subsequently, the insulating regions 20a, 21a are laser ablated from the metallic layer

46a removed. Alternatively, instead of the laser ablation, laser-induced decomposition or laser-induced oxidation of the metallic layer 46a may be used to form the insulating regions 20a, 21a. In a further step, the metallic layer 46a is finally coated with the protective layer 50a. In Fig. 2 to 7 further embodiments of the invention are shown. The following descriptions are essentially limited to the differences between the exemplary embodiments, reference being made to the description of the other exemplary embodiments, in particular FIGS. 1 a and 1 b, with regard to components, features and functions remaining the same. to

Distinction of the embodiments, the letter a in the reference numerals of the embodiment in Fig. 1 a and 1 b by the letters b to g in the reference numerals of the embodiments of FIGS. 2 to 7 replaced. With regard to identically named components, in particular with regard to components with the same reference numerals, reference may in principle also be made to the figures and / or the descriptions of the other exemplary embodiments, in particular FIGS. 1 a and 1 b.

FIGS. 2 to 4 show domestic appliance plates with alternative arrangements of insulating regions 20b-d, 21b-d. In the exemplary embodiment according to FIG. 2, four congruent insulating regions 20b, 21b are distributed uniformly over a circular outer contour 32b of a first region 16b. The annular segment-shaped insulating regions 20b, 21b each cover an angle between 70 ° and 90 ° and in particular of less than 90 °.

In the exemplary embodiment according to FIG. 3, eight congruent insulating regions 20c, 21c are distributed uniformly over a circular outer contour 32c of a first region 16c. The circular ring segment-shaped insulating regions 20c, 21c each cover an angle between 25 ° and 45 ° and in particular of less than 45 °.

The exemplary embodiment according to FIG. 4 shows a generalization in which n congruent insulating regions 20d, 21d are distributed uniformly over a circular outer contour 32d of a first region 16d. In this case, the circular segment-shaped insulating regions 20d, 21d each cover an angle of less than 360 n. The decisive factor is the fact that an impedance between the first region 16d and a second region 18d surrounding the first region 16d is substantially increased by the insulating regions 20d, 21d.

FIGS. 5 to 7 show domestic appliance plates in which a respective second region 18e-g is likewise an active region 26e-g. The second region 18e-g is in each case arranged together with a first region 16e-g in an installed state of a hob 34e-g above an induction heating element associated with a heating zone 40e-g. The second region 18e-g is in each case in the shape of an annular disk. The second region 18e-g is arranged concentrically with the first region 16e-g. Furthermore, layer systems 12e-g shown in FIGS. 5 to 7 each additionally include a third region 28e-g. The third area 28e-g is also an active area. The third region 28e-g, in each case together with the first region 16e-g and the second region 18e-g, is arranged in an installed state of the cooktop 34e-g above the induction heating element associated with the heating zone 40e-g. The third region 28e-g is likewise designed in the shape of a circular disk. The third region 28e-g is concentric with the first region 16e-g and the second region 18e-g. The third region 28e-g is in each case electrically conductively connected to the second region 18e-g. The layer system 12e-g respectively has further insulating regions 30e-g, which have an impedance between the second region 18e-g and the third

Increase range 28e-g significantly.

In the exemplary embodiment according to FIG. 5, two congruent insulating regions 20e, 21e are distributed uniformly over a circular outer contour 32e of the first region 16e. Furthermore, two further congruent insulating regions 30e are distributed uniformly over a circular outer contour of the second region 18e. Furthermore, two further congruent insulating regions are distributed uniformly over a circular outer contour of the third region 28e. The annular segment-shaped insulating regions 20e, 21e, 30e each cover an angle between 160 ° and 180 ° and in particular less than 180 °.

The insulating regions 20e, 21e, 30e are arranged next to one another in the circumferential direction of the outer contour 32e without dislocation. In the exemplary embodiment according to FIG. 6, four congruent insulating regions 20f, 21f are distributed uniformly over a circular outer contour 32f of the first region 16f. Furthermore, four further congruent insulating regions 30f are distributed uniformly over a circular outer contour of the second region 18f.

Furthermore, four further congruent insulating regions are distributed uniformly over a circular outer contour of the third region 28f. The annular segment-shaped insulating regions 20f, 21f, 30f each cover an angle between 70 ° and 90 ° and in particular less than 90 °. The insulating regions 20f, 21f, 30f are arranged side by side in the circumferential direction of the outer contour 32f viewed without dislocation.

In the exemplary embodiment according to FIG. 7, the first region 16g is in the shape of an annular disk. The layer system 12g comprises an inner insulating region 56g, which has an inner region 58g of a metallic layer 46g of the

Layer system 12g encloses. The inner insulating portion 56g completely encloses the inner portion 58g. Due to the inner insulating region 56g, the inner region 58g is electrically insulated from the first region 16g. The inner region 58g is circular disk-shaped. The circular disk-shaped inner region 58g is arranged concentrically with the annular disk-shaped first region 16g. About a circular outer contour 32g of the first region 16g evenly two congruent insulating regions 20g, 21 g are arranged. Two further congruent insulating regions 30g are uniformly arranged over a circular outer contour of the second region 18g. The annular segment-shaped insulating regions 20g, 21g, 30g each cover an angle between 160 ° and 180 ° and in particular less than 180 °. The third area 28g is electrically connected to a surrounding area 52g. The layer system 12g includes outer isolation regions 60g that substantially increase an impedance between the third region 28g and the surrounding region 52g. About a circular outer contour of the third region 28g uniformly four congruent outer insulating regions 60g are arranged. The annular segment-shaped outer insulating regions 60g each cover a NEN angle between 70 ° and 90 ° and in particular of less than 90 °. The insulating regions 20g, 21g, 30g and the outer insulating regions 60g are arranged offset in the circumferential direction of the outer contour 32g, offset from one another.

In an alternative embodiment, arbitrary forms of insulating regions which differ from a circular ring segment shape can also be selected. Furthermore, line-like insulating regions with a width of less than 25 μm can also be used. Markings of heating zones can then be applied in a known screen printing technique on an upper side or a lower side of a base plate. Due to the small width of the line-like insulating regions visual impairments of the printed markings can be at least largely avoided.

reference numeral

10 base plate

12 shift system

14 side panel area

16 First area

18 Second area

20 insulation area

21 insulation area

22 Line-like isolation area

23 Line-type isolation area

24 Active area

26 Active area

28 Third area

30 insulation area

32 outer contour

34 hob

36 hob plate

38 mark

40 heating zone

42 top

44 bottom

46 Metallic layer

48 thickness

50 protective layer

52 surrounding area

54 width

56 Inner insulation area

58 indoor area

60 Outer isolation area

Claims

claims

Domestic appliance plate having a base plate (10a-g) and at least one at least partially electrically conductive layer system (12a-g) which is arranged on at least one side part region (14a-g) of the base plate (10a-g) and at least one first region (16a). g) and at least one second region (18a-g) adjoining the first region (16a-g), characterized in that the first region (16a-g) and the second region (18a-g) are electrically conductively connected and the layer system (12a-g) has one or more isolation regions (20a-g, 21ag) which at least substantially increase an impedance between the first region (16a-g) and the second region (18a-g).

Domestic appliance plate according to claim 1, characterized in that the

Insulating region (20a-g, 21 a-g) is a line-like insulating region (22a-g, 23a-g).

Domestic appliance plate according to claim 1 or 2, characterized in that at least the first region (16a-g) is an active region (24a-g).

Home appliance plate according to claim 3, characterized in that the second region (18e-g) is also an active region (26e-g).

Domestic appliance plate according to one of the preceding claims, characterized in that the layer system (12e-g) has a third region (28e-g) adjoining the second region (18e-g) and electrically conductively connected thereto, and one or more further insulating regions (12e-g). 30e-g) which at least substantially increase an impedance between the second region (18e-g) and the third region (28e-g). Domestic appliance according to one of the preceding claims, characterized in that at least one of the regions (16a-f) is disc-shaped and has an at least partially curved outer contour (32a-f).

Domestic appliance plate according to one of the preceding claims, characterized in that at least one of the regions (16g; 18e-g, 28e-g) is annular disk-shaped.

Domestic appliance according to claim 6 or 7, characterized in that the layer system (12a-g) at least two congruent insulating regions (20a-g, 21 ag), which viewed perpendicular to a Haupterstre- ckungsebene the base plate (10a-g) evenly over a Outer contour (32a-g) of at least one of the areas (16a-g, 18a-g, 28a-g) are distributed.

Method for producing a household appliance plate having a base plate (10a-g) and at least one at least partially electrically conductive layer system (12a-g), which is arranged on at least one side part region (14a-g) of the base plate (10a-g) and at least one first A region (16a-g) and at least one second region (18a-g) adjoining the first region (16a-g), in particular according to one of the preceding claims, in which the first region (16a-g) and the second region (16) 18a-g) are electrically conductively connected and an impedance between the first region (16a-g) and the second region (18a-g) through one or more insulating regions (20a-g, 21ag) of the layer system (12a-g) at least is significantly increased.

Domestic appliance, in particular hob (34a-g), with a domestic appliance plate according to one of claims 1 to 8.