| 摘要 |
An ink-jet printhead includes a substrate; a doughnut-shaped heater formed on a top surface of the substrate; a nozzle plate stacked on the substrate, the nozzle plate having a nozzle through which ink is ejected; an ink chamber having a cavity enclosing the heater, the ink chamber communicating with the nozzle; and an ink passage extending through the substrate in a direction perpendicular to the surface of the heater. The ink passage includes a narrow passage and a wide passage which sequentially communicate with the ink chamber. The ink passage concentrically communicates with an opening at the center of the heater and the nozzle. The ink-jet printhead is monolithically manufactured for easy manufacturing, and since the introduction direction of ink into the ink chamber coincides with the ejection direction of ink from the nozzle, the ejection of ink can stably be performed.
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