Ink jet head having improved pressure chamber and its manufacturing method

摘要

In an ink jet head including a substrate (301, 401) having a opening for a pressure chamber (3), a section of the opening is gradually increased from a front surface of the substrate to an intermediate level of the substrate and is gradually decreased from the intermediate level of the substrate to a back surface of the substrate. The opening at the front surface of the substrate serves as a nozzle (1). <IMAGE>