Inductively heated hob having a metal-coated cover plate
View Patent ↗A hob includes at least one heating inductor and a glass or glass ceramics cover plate that has at least one side coated with a metal layer coated with a metal layer. In order to improve the electromagnetic compatibility of the hob with a metal layer coating, the metal layer has a cover region which covers the heating inductor and is electrically insulated from a surrounding region of the metal layer, which surrounding region surrounds the cover region.
1. A hob, comprising:
at least one heating inductor; and
a glass or glass ceramics cover plate having at least one side coated with a metal layer, said metal layer having a cover region which covers the heating inductor, and a surrounding region which surrounds the cover region, said cover region being electrically insulated from the surrounding region.
2. The hob of claim 1 , wherein the metal layer has a thickness which is less than 50% of a magnetic penetration depth of a magnetic field produced by the heating inductor into a material of the metal layer.
3. The hob of claim 1 , wherein the metal layer has a thickness which is less than 10% of a magnetic penetration depth of a magnetic field produced by the heating inductor into a material of the metal layer.
4. The hob of claim 1 , wherein the cover region is delimited by a linear interruption in the metal layer.
5. The hob of claim 4 , wherein the interruption has a width of at least 2 mm.
6. The hob of claim 4 , further comprising a dielectric colored layer applied to the cover plate at least in a region of the interruption.
7. The hob of claim 6 , wherein the dielectric colored layer at least partially covers the metal layer.
8. The hob of claim 4 , wherein the interruption is produced by applying a mask during application of the metal layer.
9. The hob of claim 4 , wherein the interruption is produced by removing material of the metal layer following application of the metal layer.
10. The hob of claim 1 , wherein the cover region comprises a plurality of sections that are electrically insulated from each other.
11. The hob of claim 10 , wherein the sections are arranged concentrically to each other.
12. The hob of claim 11 , wherein the sections have the form of concentric rings.
13. A method for producing a glass or glass ceramics cover plate for a hob, comprising:
coating at least one side of a cover plate with a metal layer; and
working an interruption into the metal layer to delimit a cover region of the metal layer, which cover region covers a heating inductor of the hob, and to electrically insulate the cover region from a surrounding region of the metal layer.
14. The hob of claim 1 , wherein the metal layer is directly adjacent to the cover plate.
15. The hob of claim 1 , wherein the cover region is separated from the surrounding region by a continuous interruption in the metal layer.
16. The hob of claim 15 , further comprising a dielectric colored layer applied to the cover plate at least in a region of the interruption.
17. The hob of claim 16 , wherein the dielectric colored layer at least partially covers the metal layer.
18. The hob of claim 17 , wherein the dielectric colored layer completely covers the metal layer.
19. The hob of claim 18 , wherein the metal layer is directly adjacent to the cover plate.
20. A hob, comprising:
an induction heater configured to heat a cooking vessel by producing a magnetic field that generates eddy currents in the cooking vessel; and
a glass or glass ceramics cover plate having a lower side directed to the induction heater, the cover plate having a metal layer applied to the lower side of the cover plate, the metal layer having
a cover region which covers the induction heater, and
a surrounding region which surrounds the cover region,
wherein the cover region is electrically insulated from the surrounding region.