Electrostatic ink jet recorder having ejection electrodes and auxiliary electrodes divided into groups

An electrostatic ink jet recorder for recording an image on a recording medium by applying an electric field to ink containing charged toner particles and ejecting an ink drop based on a Coulomb force acting on said toner particles, said electrostatic ink jet recorder comprising:

• an electrophoresis electrode for causing the toner particles to concentrate at ejection ports;
• a plurality of ejection electrodes each for ejecting the toner particles concentrating at a particular one of said ejection ports, said plurality of ejection electrodes being divided into a plurality of first groups;
• a counter electrode facing said ejection ports with the intermediary of the recording medium;
• a plurality of auxiliary electrodes adjoining said plurality of ejection electrodes for intensifying electric fields, said plurality of auxiliary electrodes being divided into a plurality of second groups;
• a plurality of ejection drivers each for applying a voltage to a particular ejection electrode group;
• an ejection electrode controller for controlling said plurality of ejection drivers;
• a plurality of auxiliary drivers each for applying a voltage to a particular auxiliary electrode group;
• and
• an auxiliary electrode controller for controlling said plurality of auxiliary drivers,
• wherein one of said first groups contains at least two of said ejection electrodes, and one of said second groups contains at least two of said auxiliary electrodes.

An electrostatic ink jet recorder for recording an image on a recording medium by applying an electric field to ink containing charged toner particles and ejecting an ink drop based on a Coulomb force acting on said toner particles, said electrostatic ink jet recorder comprising:

• an electrophoresis electrode for causing the toner particles to concentrate at ejection ports:
• a plurality of ejection electrodes each for ejecting the toner particles concentrating at a particular one of said ejection ports;
• a counter electrode facing said ejection ports with the intermediary of the recording medium;
• and
• a plurality of auxiliary electrodes adjoining said plurality of ejection electrodes for intensifying electric fields
• wherein and said plurality of ejection electrodes as divided into first groups, at least one of said first groups having at least two of said auxiliary electrodes, and
• said plurality of auxiliary electrodes is divided into second groups, at least one of said second groups having at least two of said auxiliary electrodes.