Abstract: The seat heater includes at least one electric sheet-type heating element (10) made of flexible high-resistivity material to which the main electrodes (13A, 13B) are connected. In order to minimize the time during which the seat is perceived as being cold without any notable increase in overall power requirements, the seat heater is equipped with an additional feature (18A, 18B) for heating basically at least a partial area (SH) of the sheet-type heating element (10) with increased heating density, and a switch device for changing from heating the partial area (SH) with the additional feature (18A, 18B) to overall homogeneous heating of the sheet-type heating element (10) with regular heating density through the main electrodes (13A, 13) or the main electrodes (13A, 13B) and the additional feature (18A, 18B).

Abstract: An electrooptical module includes a converter and at least one optical wave guide having an end optically coupled to the converter through a coupling gap. The coupling gap is filled with a first light-permeable material. A second light-impermeable material protects an electrical circuit disposed in the immediate vicinity of the converter from outside light. The second material is equivalent in its basic chemical composition to the first material, but is modified in its optical properties for the sake of impermeability to light. At least one bonding wire serving to trigger the converter passes through the first and second materials.