Ink jet head, control method therefor, and ink jet recording apparatus

摘要

The present invention provides a control method for controlling an ink jet head. The inkjet head (10) includes an ejection port substrate (16) having ejection ports (28) for ejection of the droplets, ejection electrodes (18) respectively being located in a position corresponding to each of the ejection ports (28), and a guard electrode (20) formed in the ejection port substrate. The control method includes the steps of: applying a drive voltage to each of the ejection electrodes (18) in accordance with a drawing signal; and applying an AC bias voltage to the guard electrode (20), the AC bias voltage having the same frequency as the drive voltage applied to each of the ejection electrodes (18) and alternately repeating a first voltage and a second voltage being lower than the first voltage.