Patent ID: 7481942

Claim:
A method of manufacturing an ink-jet printhead, the method comprising: forming a heater and a passivation layer protecting the heater on a substrate; coating a first photosensitive photoresist on the substrate to form a passage plate; exposing the passage plate to light using a reticle having a predetermined pattern to optically determine a portion of the passage plate to be removed from the passage plate using a predetermined etchant so as to form an ink chamber corresponding to the heater and an ink passage connected to the ink chamber, and to determine a remaining portion of the passage plate; forming an exposure stop layer (ESL) that intercepts ultraviolet rays, on the portion of the passage plate to be removed from the passage plate and on the remaining portion of the passage plate where the exposure stop layer is formed to a predetermined thickness; coating a second photoresist on the exposure stop layer (ESL) to a predetermined thickness to form a nozzle plate such that the exposure stop layer is formed between the second photoresist, and the portion of the passage plate to be removed and the remaining portion of the passage plate; forming an orifice corresponding to the ink chamber in the nozzle plate by a photolithography process; and removing a part of the exposure stop layer (ESL) corresponding to the orifice and a region of the passage plate selected as the portion to be removed from the passage plate so as to form the ink chamber and the ink passage.