Patent ID: 8746845

Claim:
A liquid ejection head, comprising: a substrate provided with an energy generating element for generating energy used for ejecting liquid; a pressure chamber formed on a first surface side of the substrate having the energy generating element formed thereon, the pressure chamber communicating with an ejection orifice for ejecting liquid; a first common liquid chamber formed on the first surface side of the substrate, for supplying liquid to the pressure chamber; a filter formed between the pressure chamber and the first common liquid chamber, for inhibiting inflow of foreign matter in liquid supplied to the pressure chamber; a second common liquid chamber formed on a side opposite to the side on which the first common liquid chamber is formed with respect to the pressure chamber, for supplying liquid to the pressure chamber; a first supply opening formed in a second surface which is on an opposite side to the first surface of the substrate, the first supply opening communicating with the first common liquid chamber; a second supply opening formed in the second surface of the substrate, the second supply opening communicating with the second common liquid chamber; and a liquid receiving portion formed in the second surface of the substrate so as to communicate with both the first supply opening and the second supply opening, the liquid receiving portion receiving liquid from outside of the substrate, wherein the second common liquid chamber, the pressure chamber, and the first common liquid chamber are arranged in this order in a first direction from an end of the substrate to a center of the substrate, and wherein the first common liquid chamber communicates with the pressure chamber via the filter, and the second common liquid chamber communicates with the pressure chamber through no filter.