Ink-Jet Head And Ink-Jet Recording Device

An ink-jet recording device comprising an ink-jet head comprising:

• an ink chamber;
• a pressure chamber in communication with the ink chamber;
• a nozzle for ejecting an ink in communication with the pressure chamber;
• a piezoelectric actuator for applying an ejection pressure to an ink in the pressure chamber;
• and
• an ink passage extending from a boundary of the ink chamber to a tip of the nozzle,
• wherein the tip of the nozzle has an aperture diameter of from about 15 to about 25 μm, and the ink passage is configured such that when an ink having a viscosity of from about 2.5 to about 3 mPa·s is passed therethrough, a passage resistance value of the ink passage is from about 50 to about 100 kPa·s/mm3.

An ink-jet recording device comprising:

• an ink jet head comprising:
• an ink chamber;
• a pressure chamber in communication with the ink chamber;
• a nozzle for ejecting an ink in communication with the pressure chamber;
• a piezoelectric actuator for applying an ejection pressure to an ink in the pressure chamber;
• and
• an ink passage extending from a boundary of the ink chamber to a tip of the nozzle;
• and
• a cartridge containing ink in communication with the ink chamber,
• wherein the tip of the nozzle has an aperture diameter of from about 15 to about 25 μm, and the ink passage is configured such that when an ink having a viscosity of from about 2.5 to about 3 mPa·s is passed therethrough, a passage resistance value of the ink passage is from about 50 to about 100 kPa·s/mm3.