. . . "FIGS. 5A, 5B, 5C, and 5D are views that illustrate the continuation of the process flow shown in FIGS. 4A, 4B, 4C, 4D, 4E, 4F and 4G. FIG. 6A is a vertically sectional view that shows the nozzle structure of an ink jet head having an improved recording speed by the method of manufacture in accordance with the present invention, and FIG. 6B is a vertically sectional view that shows the nozzle struc" .