Thermal ink-jet printhead having improved heater arrangement.

摘要

A thermal ink-jet type printhead is disclosed which comprises a strip-like thin metallic layer (54) formed on a substrate (52). The layer (54) is configured so as to define a narrow portion (56) which is positioned between broad portions (58a, 58b). The narrow portion (56) defines a heating element which is integral with the broad portions (58a, 58b) which act as electrodes. Electrical Heating pulses are supplied to the narrow heater portion (56) via the electrodes. The heater arrangement (50) is durable to thermal stresses generated by a superheating and, accordingly is well suited for spontaneous or homogeneous nucleation. <IMAGE>