Patent ID: 8477166

Claim:
A thermal head, comprising: a substrate main body having a flat plate-shaped support substrate and a flat plate-shaped upper substrate which are bonded to each other in a stacked state; a rectangular-shaped heating resistor formed on a surface of the flat plate-shaped upper substrate; and a pair of electrodes connected to both ends of the rectangular-shaped heating resistor, respectively, for supplying power to the rectangular-shaped heating resistor; wherein the substrate main body has a cavity portion in a region opposed to the rectangular-shaped heating resistor at a bonding portion between the flat plate-shaped support substrate and the flat plate-shaped upper substrate; and wherein at least one of the pair of electrodes includes a low thermal conductivity portion in a region opposed to the cavity portion, the low thermal conductivity portion being made of a material having a thermal conductivity lower than a thermal conductivity in other regions of the pair of electrodes and having an electrical resistance lower than an electrical resistance of the rectangular-shaped heating resistor.