(57) An ink jet recording head (55) may improve the packing efficiency of the ink into
the pressure generating chamber (19), and improve the ejection efficiency of the ink
through the ink ejection nozzle (41) to realize a high quality gradation expression
in printing operations. The recording head (55) comprises: a pressure generating chamber
(19) communicating with an ink reservoir (40); a vibrating plate (23) which faces
the pressure generating chamber (19) and is provided with an island-like convex portion
(18); and, a piezoelectric element (20) arranged so as to be brought into contact
with the island-like convex portion (18) of the vibrating plate (23) to vibrate the
plate (23), and thereby forcing ink droplets to be ejected from the nozzle (41). The
vibrating plate (23) comprises: a first metallic layer or stainless steel member (11)
brought into contact with the piezoelectric element (20), a second metallic layer
or thin nickel film(15) exposed to the pressure generating chamber (19), and a polymer
film (13) of a high polymeric organic compound interposed between the first metallic
layer (11) and the second metallic layer (15). The island-like convex portion (18)
of the vibrating plate (23) is formed by etching a surface of the first metallic layer
(11).
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