Patent ID: 7862159
Filing Date: 2011-01-04
Classification: B41J

Abstract:
1. An ink jet recording head comprising: a recording element substrate comprising an ejection outlet array consisting of a plurality of arranged ejection outlets for ejecting ink, a plurality of heat generating elements, provided correspondingly to the ejection outlets, for generating thermal energy for ejecting the ink, and a supply port, formed along the ejection outlet array in an elongated hole-like shape, for supplying the ink to the ejection outlets; and a supporting member, having a supply flow passage communicating with the supply port, for supporting said recording element substrate, wherein said supporting member is provided with at least two beams each extending across an opening of the supply flow passage in a widthwise direction of the supply flow passage and having a width W with respect to a longitudinal direction of the supply flow passage, and wherein said at least two beams are disposed within a range from a center of the supply flow passage with respect to the longitudinal direction toward both longitudinal end sides of the supply flow passage by 2.5 W for each of the end sides and are spaced 2 mm or more apart.