Patent ID: 8100508

Claim:
An ink jet printing head comprising: a silicon substrate including an obverse face and a back face; an ejection port that ejects liquid and penetrating from the obverse face to the back face; an electrothermal transducing element configured to generate thermal energy used to eject liquid through the ejection port, the electrothermal transducing element being provided on the back face side; a conductive line connected to the electrothermal transducing element and provided on the back face; a support base supporting the silicon substrate from the back face side; an electrical portion to transmit electricity for driving the electrothermal transducing element, the electrical portion being provided on the support base and connected to the conductive line at the back face of the silicon substrate; a bump located between the silicon substrate and the support base, the bump contacting the conductive line and the electrical portion, the conductive line and the electrical portion being connected electrically; a liquid chamber wall member located between the silicon substrate and the support base and including therein a liquid chamber adapted to store liquid to be supplied to the ejection port, the liquid chamber communicating with the ejection port; and a sealant covering the conductive line, the electrical portion and the bump, at outside of the chamber.