| 摘要 |
PROBLEM TO BE SOLVED: To restrain the vaporization of an ink solvent without deteriorating the volume change efficiency in a pressure generating room by providing an elastic plate with a polymer film having a metal island part formed thereon, and forming an air blocking layer on the surface of the area to be a diaphragm part. SOLUTION: A thin plate obtained by rolling to about 10 to 50μm thickness a material with a high rigidity such as a metal or the like, and to be etched such as an anti-corrosive steel or the like, formed in a shape suitable for changing the volume of a pressure generating room 4, is formed as an island part 11 on the surface of a polymer film base material via an adhesive layer 9 formed as thin as possible, and an air blocking layer 10 made from a material having the corrosion resistance with respect to an etching agent and a high air blocking property such as silica, alumina, or the like. A diaphragm part 12 comprising an elastically deformable polymer stretch film 8 and the air blocking layer 10 made from silica, alumina, or the like, are formed in the area facing to the pressure generating room 4 so as to surround the island part 11.
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