Abstract: A heating device of a write head based on layer technology for an ink jet printer is furnished as a heating resistor (15) in the form of a heating conduit meander directly from an electrically conductive thin film, disposed in the empty spaces on a substrate, and deposited on the base oxide for furnishing the thermal converter and the conductor paths (5, 6). The empty spaces are thereby created by a spacing and a group-like combination and a gathering of the conductor paths (5, 6), wherein part sections of the heating resistors (15) are embedded in the empty spaces. The heating resistor (15) is part of a resistance measurement bridge and is employed simultaneously as a heat source and as a temperature sensor based on processing and evaluation of its electrical resistance values at different points in time.