Patent ID: 7901064

Claim:
An ink jet recording head, comprising: a substrate; a plurality of ink discharge ports formed at a first face side of the substrate, and a plurality of ink flow paths communicating with the ink discharge ports; an ink supply opening extending through the substrate and communicating with the plurality of ink flow paths; and a filter formed at an opening portion of the ink supply opening arranged in the first face side of the substrate, the filter being constituted of two or more stacked films having formed therein a plurality of opening portions, wherein the stacked films are arranged with respect to an ink flow direction with a spacing therebetween, if the diameter of each of the discharge ports is z, the diameter of each of first opening portions, which are formed in one of the films constituting the filter, the one film being closest to the first face side, is y, and the diameter of each of second opening portions, which are formed in another of the films constituting the filter, the other film being furthest from the first face side, is x, then x>y and z>y.