Patent ID: 6609783
Filing Date: 2003-08-26
Classification: B41J,Y10T

Abstract:
A method for producing an ink jet recording head comprising a heat-generating resistance layer formed on a substrate for generating thermal energy used for ink discharge, a wiring electrode layer electrically connected to the heat-generating resistance layer to form an electrothermal converting element, an insulating protective layer covering the electrothermal converting element, and an external electrical connection portion electrically connected to the electrothermal converting element and configured to connect to an external wiring for applying a voltage to the electrothermal converting element, the method comprising steps of:forming a through hole in the insulating protective layer; exposing a portion of the wiring electrode layer; and growing a layer by electroless plating from the exposed portion of the wiring electrode layer to form the external electrical connection portion, wherein the external electrical connection portion projects beyond the insulating protective layer and has a central flat surface at a most extended projection of the external electrical connection portion, the central flat surface being formed opposite the exposed portion of the wiring electrode layer.