| 摘要 |
Ink stored in an ink tank 11 passes through a supply path 12 and supply port 13 and fills a pressure chamber 14. A piezoelectric actuator 15 vibrates a vibration plate 17 by receiving a voltage from a driving voltage control unit 16. The volume of the pressure chamber 14 is changed by vibrating the vibration plate 17 to eject the ink in the pressure chamber 14 from a nozzle 18 toward to the sheet 2. The diameter of the nozzle 18 is set within the range of 20 to 40 mu m, and an ink viscosity is set within the range of 2 to 6 mPa . s. With these settings, a fine droplet having the total diameter of 25 mu m or less can be stably ejected, thereby obtaining high quality image. In addition, a driving waveform voltage is corrected in accordance with the ambient temperature detected by a temperature detection unit 19, and the ink viscosity is set within the range of 2 to 15 mPa . s, thereby keeping high image quality. <IMAGE> |
