| 摘要 |
PURPOSE:To perform high-quality printing by uniformizing ink inflow pressure and to enhance the mounting density of orifices and an ink sump, by supplying ink to a heater resistor by an elongated groove. CONSTITUTION:A membrane resistor substrate 10 is mounted on the I-shaped upper surface of a header manifold 20. The header manifold 2 has an ink sump communicated with an ink feed hole 22 mounted therein and the hole 22 is matched with the elongated groove 16 in the membrane resistor substrate 10. A nickel orifice plate 44 is arranged on a silicon carbide layer 42 and has ink sump areas 46, 48, which are positioned on heater resistors 36, 38, to receive ink through the elongated groove 16. These ink sump areas 46, 48 extend to the upper part of the substrate 10 and are connected to an outlet ink discharge orifice demarcated by converging contour walls 50, 52. These contour walls 50, 52 are planned so as to reduce cavitation abrasion during ink jet printing operation and to prevent gulping.
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