Patent ID: 8789912
Filing Date: 2014-07-29
Classification: B41J

Abstract:
1. An inkjet recording head, comprising: plural element substrates, each provided with an ejection port surface on which plural ejection ports are formed, through which ink is ejected, and plural energy generating elements which generate energy to eject the ink through the plural ejection ports; and a coolant flow channel provided on a rear surface side of the ejection port surface of the element substrates and in which a coolant, for cooling the plural element substrates, flows, the coolant flow channel including a first heat transfer portion and a second heat transfer portion, the first heat transfer portion being located on the side of the element substrates and overlapping in a direction vertical to the ejection port surface, a central portion of each of the element substrates in a direction in which the plural energy generating elements are arranged, and the second heat transfer portion being located on the side of the element substrates and overlapping in the direction vertical to the ejection port surface, an area between the plural element substrates which adjoin in the direction the plural energy generating elements are arranged, wherein the first heat transfer portion and the second heat transfer portion are provided with recesses toward a surface on the side of the element substrates, of a wall which forms the coolant flow channel, or projections protruding toward the surface of the wall on the side of the element substrates, and an arrangement density of the recesses or the projections provided in the first heat transfer portion being greater than an arrangement density of the recesses or the projections provided in the second heat transfer portion.