| 摘要 |
A thermal head for high speed printing at high temperature comprises a dielectric substrate (10, 15), a first thin SiO2 layer (20) formed on the substrate, a heater layer (30) on the first SiO2 layer, conductive layers (40) for coupling the heater layers to an external circuit, a second thin SiO2 layer (50) on the heater layer, and a protection layer (60) over the second SiO2 layer. The width of the heater layer is less than 30 mu m. The preferable thickness of the SiO2 layers is less than 2 mu m. Preferably, the heater layer is made of tantalum nitride. The presence of the first SiO2 layer (20) and the narrow width of the heater layer (30) allow the heater to operate at a higher input power, and hence at a higher temperature. |
