Patent ID: 6767081
Filing Date: 2004-07-27
Classification: B41J

Abstract:
A thermal head comprising:a heat insulating layer formed on a top surface of a substrate; a first insulating layer and a second insulating layer formed on top of the heat insulating layer, the first insulating layer containing an insulated multiple high nitride ceramic layer of low thermal conductivity comprising Si3N4 and the second insulating layer formed on top of the first insulating layer containing an SiO2 layer of high insulation characteristics or an Al2O3 layer; plural heating elements containing plural heating resistors and power feeding members formed on the heat insulating layer, the heating resistors formed on the second insulating layer; and a protective layer that covers at least surfaces of the heating resistors and the power feeding members, wherein the heat insulating layer contains of-an electrically-conductive multiple low oxide ceramic layer with low thermal conductivity that includes a chemical compound of Si, plural transition metals and oxygen.