Patent ID: 8029110

Claim:
A droplet ejection head, comprising: a substrate having first through-holes that serves as reservoir chambers for reserving an ejection liquid and a second through-hole that serves as a supply chamber for supplying the ejection liquid to the reservoir chambers, the substrate having one surface on which a first bonding film is formed and the other surface opposite to the one surface thereof; a nozzle plate having nozzles for ejecting the ejection liquid as droplets, the nozzle plate having one surface on which a second bonding film is formed and the other surface opposite to the one surface thereof, wherein the nozzle plate is bonded to the substrate together through the first bonding film and the second bonding film so as to cover the first through-holes and the second through-hole of the substrate; a sealing plate provided on the other surface of the substrate so as to cover the first through-holes, the sealing plate having one surface being in contact with the other surface of the substrate and the other surface opposite to the one surface thereof; and piezoelectric means provided on a part of the other surface of the sealing plate for driving the droplet ejection head to eject the ejection liquid; wherein each of the first bonding film and the second bonding film contains an Si-skeleton constituted of constituent atoms containing silicon atoms, and the Si-skeleton has siloxane (Si—O) bonds and elimination groups bonded to the silicon atoms, wherein the constituent atoms are randomly bonded to each other, and the elimination groups exist in the vicinity of a surface of each of the first bonding film and the second bonding film, and wherein the nozzle plate is bonded to the substrate together through the first bonding film and the second bonding film since the elimination groups are eliminated from the silicon atoms contained in the constituent atoms constituting the Si-skeleton in each of the first bonding film and the second bonding film by imparting energy to at least a part thereof to develop bonding property in the vicinity of the surface of each of the first bonding film and the second bonding film so that the first bonding film and the second bonding film are firmly bonded together by the developed bonding property.