| 摘要 |
An ink jet head substrate including a base plate; an elongated through opening, for ink supply port, extending in a longitudinal direction of the base plate; a plurality of heat generating resisters arranged on the base plate along both sides of the opening; a pair of electrodes electrically connected to the heat generating resisters; electrode pads for external electric connection, the pad being arranged adjacent opposite ends of the base plate substantially in parallel with a line along which the heat generating resisters are arranged; wherein a length Ls of the base plate measured in a direction along the line, a length Lh of a range in which the heat generating resisters are arranged, and a length Lp of a range in which the pads are disposed, satisfy Lp</=Ls-2x(Ls-Lh).
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