| 摘要 |
PROBLEM TO BE SOLVED: To perform recording stably over a long term by aggregating particles of coloring matter efficiently. SOLUTION: The recording head 1 of an image forming unit comprises a substrate 2 on which a plurality of ink channels 4 are formed. An annular recording electrode 6 is formed coaxially with the opening 4a of each ink channel 4 on the upper surface 2a of the substrate 2. An ink case 8 forming a cavity 7 with respect to the substrate 2 is disposed under the substrate 2. A control electrode 14 is formed on the bottom of the case 8 while extending substantially in parallel with each recording electrode 6. Each recording electrode 6 is applied with a recording voltage corresponding to an image signal. The control electrode 14 is applied with a control voltage higher than the jet voltage during the recording operation and applied with a control voltage lower than the bias voltage during non-recording operation. |
