Patent ID: 8414111

Claim:
A droplet ejection head, comprising: a nozzle for ejecting droplets; a charging electrode that applies a first charge to droplets used for printing and applies a second charge or no charge to droplets not used for printing from among flying droplets ejected from the nozzle, the second charge differing from the first charge in at least one from among electrical charge and polarity; and a deflecting electrode provided with an aperture for allowing flying droplets to pass through and including a plurality of electrodes arranged in a direction of a trajectory axis line along which the droplets enter the aperture, the deflecting electrode deflecting droplets to which a charge has been applied by the charging electrode, wherein the deflecting electrode includes a first electrode and a second electrode having a potential difference therebetween, and the electric field formed by the potential difference is asymmetric with respect to the trajectory axis line near the first electrode, and symmetric with respect to the trajectory axis line near the second electrode.