| 摘要 |
PURPOSE:To make it possible to prevent the mixing of air, by a method wherein a small volume capacity chamber is arranged between a nozzle hole and a pressure generating chamber while a thin layer ink supply part having capillary action is provided between plural injection channel system and a common ink sump. CONSTITUTION:Between a nozzle hole 10 and a pressure generating chamber 12, a capacity chamber 11 stabilizing the injection of ink droplets, preventing the mixing of air bubbles from the nozzle hole 10 into the pressure generating chamber 12 and having a volume smaller than that of the pressure generating chamber 12 is provided. In addition, to the other end of the pressure generating chamber 12 with a depth l1, a thin layer ink supply part 13 with a depth l2 of about 0.04-2.0mm. for uniformly supplying an ink to each injection channel by a capillary phenomenon is provided while the ink is supplied from an ink sump 14 with a depth l3 having an air vent hole 18 provided to the upper part thereof and an ink supply port 15 provided to the lower part thereof. In this case, formula l3>l2>=l1 is realized. By this method, the equibrium state of the ink can be held only by the ink surface tension of the nozzle hole and high speed injection free from the mixing of air can be carried out. |
