FUNCTIONAL INK, ELECTRIC MACHINE CONVERSION ELEMENT, DROPLET DISCHARGE HEAD, AND INKJET RECORDING APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide functional ink to be used for forming an electro-mechanical conversion film of good quality.SOLUTION: A hydrophilic region is formed with a functional ink film 52. The functional ink film 52 is one to be used when an electro-mechanical conversion film is formed, and contains an auxiliary solvent different from the main solvent of the precursor sol-gel solution, and the ratio of a drying speed to the main solvent is 75% or less. The functional ink film 52 is subjected to a heat treatment so that a heat-treated functional ink film 53 is formed. By the heat treatment, a SAM film 50 is caused to disappear.