Patent ID: 6448993
Filing Date: 2002-09-10
Classification: B41J

Abstract:
A thermal printhead comprising:a head substrate; a heating resistor provided on the head substrate; a plurality of individual electrodes connected to the heating resistor; a common electrode including a first conductive layer connected to the heating resistor, and a second conductive layer formed on the first conductive layer and connected to the first conductive layer, the common electrode being separate from the individual electrodes, the second conductive layer having a smaller resistivity than the first conductive layer; a first coating layer covering the heating resistor, the individual electrodes and the common electrode; and a second coating layer formed on the first coating layer, the second coating layer comprising sialon which contains a conductive material as an additive; wherein the first coating layer is formed with at least one through-hole or notch; wherein the second coating layer is electrically connected to the second conductive layer of the common electrode via the through-hole or the notch.