Process for producing a hotplate for a hob

A method for manufacturing a hotplate for a hob having at least one cooking zone that is visible when viewing the hob on a topside and upon which a preparation vessel can be positioned for preparing food, the method consisting essentially of:

• providing the hotplate, wherein the hotplate is one of a glass hotplate and a ceramic hotplate;
• applying at least one metallic layer on an entire underside of the hotplate;
• applying at least one dielectric color coating consecutively to an entire underside of the at least one metallic layer such that the at least one metallic layer is between the hotplate and the at least one dielectric color coating;
• and
• after applying the at least one metallic layer and the at least one dielectric color coating, forming the at least one cooking zone on the hotplate by applying a laser light of a laser beam to at least one region of the at least one metallic layer and moving the laser light with respect to the at least one region of the at least one metallic layer such that an entire layer thickness of the at least one region of the at least one metallic layer disposed between the hotplate and the at least one dielectric color coating is completely continuously removed with each movement of the laser light so that the at least one dielectric color coating is visible from the topside of the hotplate.

A method for forming a hotplate for a hob having at least one cooking zone that is visible when viewing the hob on a topside and upon which a preparation vessel can be positioned for preparing food, the method consisting essentially of:

• providing the hotplate, wherein the hotplate is one of a glass hotplate and a ceramic hotplate;
• applying at least one metallic layer on an entire underside of the hotplate, wherein the at least one metallic layer has a thickness of less than 130 nm;
• applying at least one further layer of dielectric material consecutively to an entire underside of the at least one metallic layer such that the at least one metallic layer is between the hotplate and the further layer, wherein the further layer has a thickness of less than 250 μm;
• after applying the at least one metallic layer and the further layer, forming the at least one cooking zone on the hotplate that is visible when viewing the hob on the topside by irradiating at least one region of the at least one metallic layer with a laser light of a laser beam having a pulse frequency of 110 kHz and directed to strike a topside of the hotplate and to radiate through the hotplate and moving the laser light at a speed of 2000 mm/s with respect to the at least one region of the at least one metallic layer such that an entire layer thickness of the at least one region of the at least one metallic layer disposed between the hotplate and the further layer is completely continuously removed in lines having a thickness of less than 500 μm with each movement of the laser light so that the further layer is recognized when viewing the hob on the topside.