Patent ID: 7070912

Claim:
A method of manufacturing a monolithic inkjet printhead comprising the steps of: (a) forming a heater for heating ink and an electrode for supplying electric current to the heater on a substrate; (b) coating a negative photoresist on the substrate on which the heater and the electrode are formed, and patterning the photoresist using a photolithography process to form a flow path forming layer that defines an ink flow path; (c) forming a sacrificial layer so as to cover the flow path forming layer on the substrate on which the flow path is formed; (d) flattening and height adjusting upper surfaces of the flow path forming layer and the sacrificial layer by a polishing process; (e) coating a negative photoresist on the flow path forming layer and the sacrificial layer, and patterning the photoresist using a photolithography process to form a nozzle layer having a nozzle; (f) forming an ink feed hole on the substrate; and (g) removing the sacrificial layer.