| 摘要 |
PURPOSE:To perform favorable multi-gradational recording by using large and small diameter ink droplets, by operating a means for generating a charging voltage for large diameter ink droplets at the time of recording by use of the large diameter ink droplets, operating a means for generating a chaging voltage for small diameter ink droplets at the time of recording by use of the small diameter ink droplets, and performing switching of an ink droplet generating mode during a non-recording period. CONSTITUTION:A sine wave supplied from a high frequency power source 16 to dropletize an ink through excitation of a nozzle 21 is controlled in voltage by a volume control 17 so as to generate small diameter ink droplets, and is controlled in voltage by a volume control 18 so as to generate large diameter ink droplets. A relay 19 selects either one of a large diameter ink droplet exciting voltage sent from the volume control 18 and a small diameter ink droplet exciting voltage sent from the volume control 17, then the selected voltage is amplied by an OP amplifier 20, and is applied to a piezoelectric element 22. Switching a large diameter ink droplet generating mode to a small diameter ink droplet generating mode or vice versa is set in the period for which a non-recording area is detected by a sensor 25, namely, in a non-recording period in a recording operation. |
