| 摘要 |
A bubble-jet type ink-jet printing head is provided. The ink-jet printing head includes a nozzle plate in which a plurality of nozzles, through which ink is ejected, are formed, a substrate for supporting the nozzle plate, on which a plurality of heaters having three-dimensionally concave surfaces oppose the plurality of nozzles, respectively, electrodes which are formed on the top surface of the substrate and electrically coupled to each heater so as to apply current to the heater, a plurality of ink chambers which are formed between the bottom of the nozzle plate and the surfaces of the corresponding heaters and filled with ink, and an ink feed channel, formed between the nozzle plate and the substrate so as to connect with the ink chambers, for supplying ink to the ink chambers. Each heater includes a hemispherical member and a flange disposed along the rim of the hemispherical member. The ink feed channel connects with the entire circumference of each ink chamber. Accordingly, expansion energy of a bubble formed on the surface of the heater is concentrated toward the nozzle thereby improving a energy efficiency, and a back flow of ink is prevented by the bubble formed on the flange of the heater. Furthermore, ink can quickly refills the ink chamber after ejection of an ink droplet, thereby further increasing the ejection driving frequency.
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