Patent ID: 7658469

Claim:
An ink jet head, comprising: an orifice plate portion including an ink ejection opening penetrating the orifice plate portion from an inlet side to an outlet side; and a substrate including an energy generating element for generating energy used for discharging ink from the ink ejection opening, the energy generating element facing the inlet side of the ink ejection opening, wherein said orifice plate portion is formed entirely of a cured product obtained from a material comprising a composition comprising a polymerizable resin having an epoxy group or an oxetanyl group and a condensation product of a hydrolysable silane compound having a fluorine-containing group and a hydrolysable silane compound having an epoxy group or an oxetanyl group, and wherein a first surface of said orifice plate portion containing the inlet side of the ink ejection opening has a lower liquid repellency than a second surface of said orifice plate portion containing the outlet side of the ink ejection opening.