Patent ID: 6984025
Filing Date: 2006-01-10
Classification: B41J

Abstract:
1. An ink jet head including a substrate provided with heat generating elements for generating bubbles in ink on a surface of said substrate, a plurality of discharge ports for discharging the ink, said discharge ports opposed to said surface of said substrate, and a plurality of ink flow passages communicating with said plurality of discharge ports, respectively, to feed the ink, said ink jet head discharging the ink from said discharge ports by pressure generated by generating the bubbles, wherein a plurality of said heat generating elements is provided in each of said ink flow passages, and for each ink flow passage said respective discharge port is arranged on an extension line extending from a center of a pressure generating area including said plurality of heat generating elements toward the surface of said substrate in a normal direction, and a distance dhc between center lines, with respect to an ink flow direction, of each of two heat generating elements arranged farthest apart from each other among said plurality of heat generating elements in a given one of said ink flow passages is larger than a diameter do of an aperture of said discharge port corresponding to the given ink flow passage.