Filament structure, lighting device having a filament structure, and method for producing a lighting device having a filament structure

A filament structure for a lighting device comprising:

• at least two filament elements, each of the at least two filament elements comprising:
• a leadframe element having a first end region and a second end region;
• and
• a plurality of light-emitting diodes arranged on the leadframe element;
• at least one connecting element connecting the first end region of one of the at least two filament elements to the first end region of another of the at least two filament elements so that the at least two filament elements are connected in series;
• and
• at least one further filament element comprising a leadframe element comprising a first end region and a second end region and a plurality of light-emitting diodes,
• wherein the leadframe element of the further filament element is a part of an one-piece leadframe,
• wherein the first end region of the leadframe element of the further filament element is connected via the connecting element to the first end regions of the at least two filament elements,
• wherein one of the at least two filament elements and the further filament element are electrically conductively connected to one another with the second end regions so that the one of the at least two filament elements and the further filament element are connected in parallel,
• wherein the second end regions are connected by a further connecting element of the one-piece leadframe and/or the second end regions are connected by a connector which is separate and independent from the one-piece leadframe,
• wherein the leadframe elements of all the filament elements and the at least one connecting element form the one-piece leadframe, and
• wherein the connecting element is shaped and/or bendable such that each of the filament elements of the filament structure extends along a lateral surface of an imaginary cone or pyramid.